2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
46 * @defgroup libavc libavcodec
47 * Encoding/Decoding Library
51 * @defgroup lavc_decoding Decoding
55 * @defgroup lavc_encoding Encoding
59 * @defgroup lavc_codec Codecs
61 * @defgroup lavc_codec_native Native Codecs
64 * @defgroup lavc_codec_wrappers External library wrappers
67 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
71 * @defgroup lavc_internal Internal
79 * @defgroup lavc_encdec send/receive encoding and decoding API overview
82 * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
83 * avcodec_receive_packet() functions provide an encode/decode API, which
84 * decouples input and output.
86 * The API is very similar for encoding/decoding and audio/video, and works as
88 * - Set up and open the AVCodecContext as usual.
90 * - For decoding, call avcodec_send_packet() to give the decoder raw
91 * compressed data in an AVPacket.
92 * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
93 * containing uncompressed audio or video.
94 * In both cases, it is recommended that AVPackets and AVFrames are
95 * refcounted, or libavcodec might have to copy the input data. (libavformat
96 * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
97 * refcounted AVFrames.)
98 * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
99 * functions and process their output:
100 * - For decoding, call avcodec_receive_frame(). On success, it will return
101 * an AVFrame containing uncompressed audio or video data.
102 * - For encoding, call avcodec_receive_packet(). On success, it will return
103 * an AVPacket with a compressed frame.
104 * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
105 * AVERROR(EAGAIN) return value means that new input data is required to
106 * return new output. In this case, continue with sending input. For each
107 * input frame/packet, the codec will typically return 1 output frame/packet,
108 * but it can also be 0 or more than 1.
110 * At the beginning of decoding or encoding, the codec might accept multiple
111 * input frames/packets without returning a frame, until its internal buffers
112 * are filled. This situation is handled transparently if you follow the steps
115 * In theory, sending input can result in EAGAIN - this should happen only if
116 * not all output was received. You can use this to structure alternative decode
117 * or encode loops other than the one suggested above. For example, you could
118 * try sending new input on each iteration, and try to receive output if that
121 * End of stream situations. These require "flushing" (aka draining) the codec,
122 * as the codec might buffer multiple frames or packets internally for
123 * performance or out of necessity (consider B-frames).
124 * This is handled as follows:
125 * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
126 * or avcodec_send_frame() (encoding) functions. This will enter draining
128 * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
129 * (encoding) in a loop until AVERROR_EOF is returned. The functions will
130 * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
131 * - Before decoding can be resumed again, the codec has to be reset with
132 * avcodec_flush_buffers().
134 * Using the API as outlined above is highly recommended. But it is also
135 * possible to call functions outside of this rigid schema. For example, you can
136 * call avcodec_send_packet() repeatedly without calling
137 * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
138 * until the codec's internal buffer has been filled up (which is typically of
139 * size 1 per output frame, after initial input), and then reject input with
140 * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
141 * read at least some output.
143 * Not all codecs will follow a rigid and predictable dataflow; the only
144 * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
145 * one end implies that a receive/send call on the other end will succeed, or
146 * at least will not fail with AVERROR(EAGAIN). In general, no codec will
147 * permit unlimited buffering of input or output.
149 * This API replaces the following legacy functions:
150 * - avcodec_decode_video2() and avcodec_decode_audio4():
151 * Use avcodec_send_packet() to feed input to the decoder, then use
152 * avcodec_receive_frame() to receive decoded frames after each packet.
153 * Unlike with the old video decoding API, multiple frames might result from
154 * a packet. For audio, splitting the input packet into frames by partially
155 * decoding packets becomes transparent to the API user. You never need to
156 * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
157 * no data was read from the packet).
158 * Additionally, sending a flush/draining packet is required only once.
159 * - avcodec_encode_video2()/avcodec_encode_audio2():
160 * Use avcodec_send_frame() to feed input to the encoder, then use
161 * avcodec_receive_packet() to receive encoded packets.
162 * Providing user-allocated buffers for avcodec_receive_packet() is not
164 * - The new API does not handle subtitles yet.
166 * Mixing new and old function calls on the same AVCodecContext is not allowed,
167 * and will result in undefined behavior.
169 * Some codecs might require using the new API; using the old API will return
170 * an error when calling it. All codecs support the new API.
172 * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
173 * would be an invalid state, which could put the codec user into an endless
174 * loop. The API has no concept of time either: it cannot happen that trying to
175 * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
176 * later accepts the packet (with no other receive/flush API calls involved).
177 * The API is a strict state machine, and the passage of time is not supposed
178 * to influence it. Some timing-dependent behavior might still be deemed
179 * acceptable in certain cases. But it must never result in both send/receive
180 * returning EAGAIN at the same time at any point. It must also absolutely be
181 * avoided that the current state is "unstable" and can "flip-flop" between
182 * the send/receive APIs allowing progress. For example, it's not allowed that
183 * the codec randomly decides that it actually wants to consume a packet now
184 * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
185 * avcodec_send_packet() call.
190 * @defgroup lavc_core Core functions/structures.
193 * Basic definitions, functions for querying libavcodec capabilities,
194 * allocating core structures, etc.
200 * Identify the syntax and semantics of the bitstream.
201 * The principle is roughly:
202 * Two decoders with the same ID can decode the same streams.
203 * Two encoders with the same ID can encode compatible streams.
204 * There may be slight deviations from the principle due to implementation
207 * If you add a codec ID to this list, add it so that
208 * 1. no value of an existing codec ID changes (that would break ABI),
209 * 2. it is as close as possible to similar codecs
211 * After adding new codec IDs, do not forget to add an entry to the codec
212 * descriptor list and bump libavcodec minor version.
218 AV_CODEC_ID_MPEG1VIDEO,
219 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
221 AV_CODEC_ID_MPEG2VIDEO_XVMC,
222 #endif /* FF_API_XVMC */
233 AV_CODEC_ID_RAWVIDEO,
234 AV_CODEC_ID_MSMPEG4V1,
235 AV_CODEC_ID_MSMPEG4V2,
236 AV_CODEC_ID_MSMPEG4V3,
259 AV_CODEC_ID_INTERPLAY_VIDEO,
266 AV_CODEC_ID_MSVIDEO1,
271 AV_CODEC_ID_TRUEMOTION1,
272 AV_CODEC_ID_VMDVIDEO,
297 AV_CODEC_ID_TRUEMOTION2,
303 AV_CODEC_ID_SMACKVIDEO,
308 AV_CODEC_ID_JPEG2000,
314 AV_CODEC_ID_DSICINVIDEO,
315 AV_CODEC_ID_TIERTEXSEQVIDEO,
323 AV_CODEC_ID_BETHSOFTVID,
335 AV_CODEC_ID_ESCAPE124,
339 AV_CODEC_ID_MOTIONPIXELS,
351 AV_CODEC_ID_FLASHSV2,
352 AV_CODEC_ID_CDGRAPHICS,
355 AV_CODEC_ID_BINKVIDEO,
356 AV_CODEC_ID_IFF_ILBM,
357 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
363 AV_CODEC_ID_A64_MULTI,
364 AV_CODEC_ID_A64_MULTI5,
367 AV_CODEC_ID_LAGARITH,
371 AV_CODEC_ID_WMV3IMAGE,
372 AV_CODEC_ID_VC1IMAGE,
374 AV_CODEC_ID_BMV_VIDEO,
381 AV_CODEC_ID_ZEROCODEC,
390 AV_CODEC_ID_ESCAPE130,
393 AV_CODEC_ID_HNM4_VIDEO,
395 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
397 AV_CODEC_ID_ALIAS_PIX,
398 AV_CODEC_ID_BRENDER_PIX,
399 AV_CODEC_ID_PAF_VIDEO,
412 AV_CODEC_ID_SCREENPRESSO,
415 AV_CODEC_ID_Y41P = 0x8000,
420 AV_CODEC_ID_TARGA_Y216,
432 AV_CODEC_ID_TRUEMOTION2RT,
434 AV_CODEC_ID_MAGICYUV,
435 AV_CODEC_ID_SHEERVIDEO,
442 AV_CODEC_ID_CLEARVIDEO,
445 AV_CODEC_ID_BITPACKED,
450 /* various PCM "codecs" */
451 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
452 AV_CODEC_ID_PCM_S16LE = 0x10000,
453 AV_CODEC_ID_PCM_S16BE,
454 AV_CODEC_ID_PCM_U16LE,
455 AV_CODEC_ID_PCM_U16BE,
458 AV_CODEC_ID_PCM_MULAW,
459 AV_CODEC_ID_PCM_ALAW,
460 AV_CODEC_ID_PCM_S32LE,
461 AV_CODEC_ID_PCM_S32BE,
462 AV_CODEC_ID_PCM_U32LE,
463 AV_CODEC_ID_PCM_U32BE,
464 AV_CODEC_ID_PCM_S24LE,
465 AV_CODEC_ID_PCM_S24BE,
466 AV_CODEC_ID_PCM_U24LE,
467 AV_CODEC_ID_PCM_U24BE,
468 AV_CODEC_ID_PCM_S24DAUD,
469 AV_CODEC_ID_PCM_ZORK,
470 AV_CODEC_ID_PCM_S16LE_PLANAR,
472 AV_CODEC_ID_PCM_F32BE,
473 AV_CODEC_ID_PCM_F32LE,
474 AV_CODEC_ID_PCM_F64BE,
475 AV_CODEC_ID_PCM_F64LE,
476 AV_CODEC_ID_PCM_BLURAY,
479 AV_CODEC_ID_PCM_S8_PLANAR,
480 AV_CODEC_ID_PCM_S24LE_PLANAR,
481 AV_CODEC_ID_PCM_S32LE_PLANAR,
482 AV_CODEC_ID_PCM_S16BE_PLANAR,
484 AV_CODEC_ID_PCM_S64LE = 0x10800,
485 AV_CODEC_ID_PCM_S64BE,
486 AV_CODEC_ID_PCM_F16LE,
487 AV_CODEC_ID_PCM_F24LE,
489 /* various ADPCM codecs */
490 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
491 AV_CODEC_ID_ADPCM_IMA_WAV,
492 AV_CODEC_ID_ADPCM_IMA_DK3,
493 AV_CODEC_ID_ADPCM_IMA_DK4,
494 AV_CODEC_ID_ADPCM_IMA_WS,
495 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
496 AV_CODEC_ID_ADPCM_MS,
497 AV_CODEC_ID_ADPCM_4XM,
498 AV_CODEC_ID_ADPCM_XA,
499 AV_CODEC_ID_ADPCM_ADX,
500 AV_CODEC_ID_ADPCM_EA,
501 AV_CODEC_ID_ADPCM_G726,
502 AV_CODEC_ID_ADPCM_CT,
503 AV_CODEC_ID_ADPCM_SWF,
504 AV_CODEC_ID_ADPCM_YAMAHA,
505 AV_CODEC_ID_ADPCM_SBPRO_4,
506 AV_CODEC_ID_ADPCM_SBPRO_3,
507 AV_CODEC_ID_ADPCM_SBPRO_2,
508 AV_CODEC_ID_ADPCM_THP,
509 AV_CODEC_ID_ADPCM_IMA_AMV,
510 AV_CODEC_ID_ADPCM_EA_R1,
511 AV_CODEC_ID_ADPCM_EA_R3,
512 AV_CODEC_ID_ADPCM_EA_R2,
513 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
514 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
515 AV_CODEC_ID_ADPCM_EA_XAS,
516 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
517 AV_CODEC_ID_ADPCM_IMA_ISS,
518 AV_CODEC_ID_ADPCM_G722,
519 AV_CODEC_ID_ADPCM_IMA_APC,
520 AV_CODEC_ID_ADPCM_VIMA,
521 #if FF_API_VIMA_DECODER
522 AV_CODEC_ID_VIMA = AV_CODEC_ID_ADPCM_VIMA,
525 AV_CODEC_ID_ADPCM_AFC = 0x11800,
526 AV_CODEC_ID_ADPCM_IMA_OKI,
527 AV_CODEC_ID_ADPCM_DTK,
528 AV_CODEC_ID_ADPCM_IMA_RAD,
529 AV_CODEC_ID_ADPCM_G726LE,
530 AV_CODEC_ID_ADPCM_THP_LE,
531 AV_CODEC_ID_ADPCM_PSX,
532 AV_CODEC_ID_ADPCM_AICA,
533 AV_CODEC_ID_ADPCM_IMA_DAT4,
534 AV_CODEC_ID_ADPCM_MTAF,
537 AV_CODEC_ID_AMR_NB = 0x12000,
540 /* RealAudio codecs*/
541 AV_CODEC_ID_RA_144 = 0x13000,
544 /* various DPCM codecs */
545 AV_CODEC_ID_ROQ_DPCM = 0x14000,
546 AV_CODEC_ID_INTERPLAY_DPCM,
547 AV_CODEC_ID_XAN_DPCM,
548 AV_CODEC_ID_SOL_DPCM,
550 AV_CODEC_ID_SDX2_DPCM = 0x14800,
551 AV_CODEC_ID_GREMLIN_DPCM,
554 AV_CODEC_ID_MP2 = 0x15000,
555 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
565 AV_CODEC_ID_VMDAUDIO,
571 AV_CODEC_ID_WESTWOOD_SND1,
572 AV_CODEC_ID_GSM, ///< as in Berlin toast format
575 AV_CODEC_ID_TRUESPEECH,
577 AV_CODEC_ID_SMACKAUDIO,
580 AV_CODEC_ID_DSICINAUDIO,
582 AV_CODEC_ID_MUSEPACK7,
584 AV_CODEC_ID_GSM_MS, /* as found in WAV */
590 AV_CODEC_ID_NELLYMOSER,
591 AV_CODEC_ID_MUSEPACK8,
593 AV_CODEC_ID_WMAVOICE,
595 AV_CODEC_ID_WMALOSSLESS,
604 AV_CODEC_ID_BINKAUDIO_RDFT,
605 AV_CODEC_ID_BINKAUDIO_DCT,
606 AV_CODEC_ID_AAC_LATM,
611 AV_CODEC_ID_8SVX_EXP,
612 AV_CODEC_ID_8SVX_FIB,
613 AV_CODEC_ID_BMV_AUDIO,
618 AV_CODEC_ID_COMFORT_NOISE,
620 AV_CODEC_ID_METASOUND,
621 AV_CODEC_ID_PAF_AUDIO,
625 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
627 AV_CODEC_ID_SONIC_LS,
630 AV_CODEC_ID_DSD_LSBF,
631 AV_CODEC_ID_DSD_MSBF,
632 AV_CODEC_ID_DSD_LSBF_PLANAR,
633 AV_CODEC_ID_DSD_MSBF_PLANAR,
635 AV_CODEC_ID_INTERPLAY_ACM,
639 AV_CODEC_ID_ATRAC3AL,
640 AV_CODEC_ID_ATRAC3PAL,
642 /* subtitle codecs */
643 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
644 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
645 AV_CODEC_ID_DVB_SUBTITLE,
646 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
649 AV_CODEC_ID_MOV_TEXT,
650 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
651 AV_CODEC_ID_DVB_TELETEXT,
654 AV_CODEC_ID_MICRODVD = 0x17800,
658 AV_CODEC_ID_REALTEXT,
660 AV_CODEC_ID_SUBVIEWER1,
661 AV_CODEC_ID_SUBVIEWER,
668 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
670 /* other specific kind of codecs (generally used for attachments) */
671 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
672 AV_CODEC_ID_TTF = 0x18000,
674 AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
675 AV_CODEC_ID_BINTEXT = 0x18800,
679 AV_CODEC_ID_SMPTE_KLV,
681 AV_CODEC_ID_TIMED_ID3,
682 AV_CODEC_ID_BIN_DATA,
685 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
687 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
688 * stream (only used by libavformat) */
689 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
690 * stream (only used by libavformat) */
691 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
692 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
696 * This struct describes the properties of a single codec described by an
698 * @see avcodec_descriptor_get()
700 typedef struct AVCodecDescriptor {
702 enum AVMediaType type;
704 * Name of the codec described by this descriptor. It is non-empty and
705 * unique for each codec descriptor. It should contain alphanumeric
706 * characters and '_' only.
710 * A more descriptive name for this codec. May be NULL.
712 const char *long_name;
714 * Codec properties, a combination of AV_CODEC_PROP_* flags.
718 * MIME type(s) associated with the codec.
719 * May be NULL; if not, a NULL-terminated array of MIME types.
720 * The first item is always non-NULL and is the preferred MIME type.
722 const char *const *mime_types;
724 * If non-NULL, an array of profiles recognized for this codec.
725 * Terminated with FF_PROFILE_UNKNOWN.
727 const struct AVProfile *profiles;
731 * Codec uses only intra compression.
732 * Video and audio codecs only.
734 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
736 * Codec supports lossy compression. Audio and video codecs only.
737 * @note a codec may support both lossy and lossless
740 #define AV_CODEC_PROP_LOSSY (1 << 1)
742 * Codec supports lossless compression. Audio and video codecs only.
744 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
746 * Codec supports frame reordering. That is, the coded order (the order in which
747 * the encoded packets are output by the encoders / stored / input to the
748 * decoders) may be different from the presentation order of the corresponding
751 * For codecs that do not have this property set, PTS and DTS should always be
754 #define AV_CODEC_PROP_REORDER (1 << 3)
756 * Subtitle codec is bitmap based
757 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
759 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
761 * Subtitle codec is text based.
762 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
764 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
767 * @ingroup lavc_decoding
768 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
769 * This is mainly needed because some optimized bitstream readers read
770 * 32 or 64 bit at once and could read over the end.<br>
771 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
772 * MPEG bitstreams could cause overread and segfault.
774 #define AV_INPUT_BUFFER_PADDING_SIZE 32
777 * @ingroup lavc_encoding
778 * minimum encoding buffer size
779 * Used to avoid some checks during header writing.
781 #define AV_INPUT_BUFFER_MIN_SIZE 16384
783 #if FF_API_WITHOUT_PREFIX
785 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
787 #define FF_INPUT_BUFFER_PADDING_SIZE 32
790 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
792 #define FF_MIN_BUFFER_SIZE 16384
793 #endif /* FF_API_WITHOUT_PREFIX */
796 * @ingroup lavc_encoding
797 * motion estimation type.
798 * @deprecated use codec private option instead
800 #if FF_API_MOTION_EST
802 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
806 ME_EPZS, ///< enhanced predictive zonal search
807 ME_X1, ///< reserved for experiments
808 ME_HEX, ///< hexagon based search
809 ME_UMH, ///< uneven multi-hexagon search
810 ME_TESA, ///< transformed exhaustive search algorithm
811 ME_ITER=50, ///< iterative search
816 * @ingroup lavc_decoding
819 /* We leave some space between them for extensions (drop some
820 * keyframes for intra-only or drop just some bidir frames). */
821 AVDISCARD_NONE =-16, ///< discard nothing
822 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
823 AVDISCARD_NONREF = 8, ///< discard all non reference
824 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
825 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
826 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
827 AVDISCARD_ALL = 48, ///< discard all
830 enum AVAudioServiceType {
831 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
832 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
833 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
834 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
835 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
836 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
837 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
838 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
839 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
840 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
844 * @ingroup lavc_encoding
846 typedef struct RcOverride{
849 int qscale; // If this is 0 then quality_factor will be used instead.
850 float quality_factor;
853 #if FF_API_MAX_BFRAMES
855 * @deprecated there is no libavcodec-wide limit on the number of B-frames
857 #define FF_MAX_B_FRAMES 16
861 These flags can be passed in AVCodecContext.flags before initialization.
862 Note: Not everything is supported yet.
866 * Allow decoders to produce frames with data planes that are not aligned
867 * to CPU requirements (e.g. due to cropping).
869 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
873 #define AV_CODEC_FLAG_QSCALE (1 << 1)
875 * 4 MV per MB allowed / advanced prediction for H.263.
877 #define AV_CODEC_FLAG_4MV (1 << 2)
879 * Output even those frames that might be corrupted.
881 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
885 #define AV_CODEC_FLAG_QPEL (1 << 4)
887 * Use internal 2pass ratecontrol in first pass mode.
889 #define AV_CODEC_FLAG_PASS1 (1 << 9)
891 * Use internal 2pass ratecontrol in second pass mode.
893 #define AV_CODEC_FLAG_PASS2 (1 << 10)
897 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
899 * Only decode/encode grayscale.
901 #define AV_CODEC_FLAG_GRAY (1 << 13)
903 * error[?] variables will be set during encoding.
905 #define AV_CODEC_FLAG_PSNR (1 << 15)
907 * Input bitstream might be truncated at a random location
908 * instead of only at frame boundaries.
910 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
912 * Use interlaced DCT.
914 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
918 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
920 * Place global headers in extradata instead of every keyframe.
922 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
924 * Use only bitexact stuff (except (I)DCT).
926 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
927 /* Fx : Flag for H.263+ extra options */
929 * H.263 advanced intra coding / MPEG-4 AC prediction
931 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
933 * interlaced motion estimation
935 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
936 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
939 * Allow non spec compliant speedup tricks.
941 #define AV_CODEC_FLAG2_FAST (1 << 0)
943 * Skip bitstream encoding.
945 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
947 * Place global headers at every keyframe instead of in extradata.
949 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
952 * timecode is in drop frame format. DEPRECATED!!!!
954 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
957 * Input bitstream might be truncated at a packet boundaries
958 * instead of only at frame boundaries.
960 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
962 * Discard cropping information from SPS.
964 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
967 * Show all frames before the first keyframe
969 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
971 * Export motion vectors through frame side data
973 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
975 * Do not skip samples and export skip information as frame side data
977 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
979 * Do not reset ASS ReadOrder field on flush (subtitles decoding)
981 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
983 /* Unsupported options :
984 * Syntax Arithmetic coding (SAC)
985 * Reference Picture Selection
986 * Independent Segment Decoding */
988 /* codec capabilities */
991 * Decoder can use draw_horiz_band callback.
993 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
995 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
996 * If not set, it might not use get_buffer() at all or use operations that
997 * assume the buffer was allocated by avcodec_default_get_buffer.
999 #define AV_CODEC_CAP_DR1 (1 << 1)
1000 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
1002 * Encoder or decoder requires flushing with NULL input at the end in order to
1003 * give the complete and correct output.
1005 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1006 * with NULL data. The user can still send NULL data to the public encode
1007 * or decode function, but libavcodec will not pass it along to the codec
1008 * unless this flag is set.
1011 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1012 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1016 * The encoder needs to be fed with NULL data at the end of encoding until the
1017 * encoder no longer returns data.
1019 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1020 * flag also means that the encoder must set the pts and duration for
1021 * each output packet. If this flag is not set, the pts and duration will
1022 * be determined by libavcodec from the input frame.
1024 #define AV_CODEC_CAP_DELAY (1 << 5)
1026 * Codec can be fed a final frame with a smaller size.
1027 * This can be used to prevent truncation of the last audio samples.
1029 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
1031 #if FF_API_CAP_VDPAU
1033 * Codec can export data for HW decoding (VDPAU).
1035 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
1039 * Codec can output multiple frames per AVPacket
1040 * Normally demuxers return one frame at a time, demuxers which do not do
1041 * are connected to a parser to split what they return into proper frames.
1042 * This flag is reserved to the very rare category of codecs which have a
1043 * bitstream that cannot be split into frames without timeconsuming
1044 * operations like full decoding. Demuxers carrying such bitstreams thus
1045 * may return multiple frames in a packet. This has many disadvantages like
1046 * prohibiting stream copy in many cases thus it should only be considered
1049 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
1051 * Codec is experimental and is thus avoided in favor of non experimental
1054 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
1056 * Codec should fill in channel configuration and samplerate instead of container
1058 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
1060 * Codec supports frame-level multithreading.
1062 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
1064 * Codec supports slice-based (or partition-based) multithreading.
1066 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
1068 * Codec supports changed parameters at any point.
1070 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
1072 * Codec supports avctx->thread_count == 0 (auto).
1074 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
1076 * Audio encoder supports receiving a different number of samples in each call.
1078 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
1080 * Decoder is not a preferred choice for probing.
1081 * This indicates that the decoder is not a good choice for probing.
1082 * It could for example be an expensive to spin up hardware decoder,
1083 * or it could simply not provide a lot of useful information about
1085 * A decoder marked with this flag should only be used as last resort
1086 * choice for probing.
1088 #define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
1090 * Codec is intra only.
1092 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
1094 * Codec is lossless.
1096 #define AV_CODEC_CAP_LOSSLESS 0x80000000
1099 #if FF_API_WITHOUT_PREFIX
1101 * Allow decoders to produce frames with data planes that are not aligned
1102 * to CPU requirements (e.g. due to cropping).
1104 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
1105 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
1106 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
1107 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
1108 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
1111 * @deprecated use the "gmc" private option of the libxvid encoder
1113 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
1117 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
1118 * mpegvideo encoders
1120 #define CODEC_FLAG_MV0 0x0040
1122 #if FF_API_INPUT_PRESERVED
1124 * @deprecated passing reference-counted frames to the encoders replaces this
1127 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
1129 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
1130 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
1131 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
1134 * @deprecated edges are not used/required anymore. I.e. this flag is now always
1137 #define CODEC_FLAG_EMU_EDGE 0x4000
1139 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
1140 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
1142 #if FF_API_NORMALIZE_AQP
1144 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
1145 * mpegvideo encoders
1147 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
1149 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
1150 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
1151 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
1152 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
1153 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
1154 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
1155 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
1156 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
1157 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1158 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1159 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1160 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1161 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1163 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1164 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1165 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1166 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1168 /* Unsupported options :
1169 * Syntax Arithmetic coding (SAC)
1170 * Reference Picture Selection
1171 * Independent Segment Decoding */
1173 /* codec capabilities */
1175 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1177 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1178 * If not set, it might not use get_buffer() at all or use operations that
1179 * assume the buffer was allocated by avcodec_default_get_buffer.
1181 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1182 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1184 /* Codec can export data for HW decoding. This flag indicates that
1185 * the codec would call get_format() with list that might contain HW accelerated
1186 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1187 * including raw image format.
1188 * The application can use the passed context to determine bitstream version,
1189 * chroma format, resolution etc.
1191 #define CODEC_CAP_HWACCEL 0x0010
1192 #endif /* FF_API_XVMC */
1194 * Encoder or decoder requires flushing with NULL input at the end in order to
1195 * give the complete and correct output.
1197 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1198 * with NULL data. The user can still send NULL data to the public encode
1199 * or decode function, but libavcodec will not pass it along to the codec
1200 * unless this flag is set.
1203 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1204 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1208 * The encoder needs to be fed with NULL data at the end of encoding until the
1209 * encoder no longer returns data.
1211 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1212 * flag also means that the encoder must set the pts and duration for
1213 * each output packet. If this flag is not set, the pts and duration will
1214 * be determined by libavcodec from the input frame.
1216 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1218 * Codec can be fed a final frame with a smaller size.
1219 * This can be used to prevent truncation of the last audio samples.
1221 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1222 #if FF_API_CAP_VDPAU
1224 * Codec can export data for HW decoding (VDPAU).
1226 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1229 * Codec can output multiple frames per AVPacket
1230 * Normally demuxers return one frame at a time, demuxers which do not do
1231 * are connected to a parser to split what they return into proper frames.
1232 * This flag is reserved to the very rare category of codecs which have a
1233 * bitstream that cannot be split into frames without timeconsuming
1234 * operations like full decoding. Demuxers carrying such bitstreams thus
1235 * may return multiple frames in a packet. This has many disadvantages like
1236 * prohibiting stream copy in many cases thus it should only be considered
1239 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1241 * Codec is experimental and is thus avoided in favor of non experimental
1244 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1246 * Codec should fill in channel configuration and samplerate instead of container
1248 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1249 #if FF_API_NEG_LINESIZES
1251 * @deprecated no codecs use this capability
1253 #define CODEC_CAP_NEG_LINESIZES 0x0800
1256 * Codec supports frame-level multithreading.
1258 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1260 * Codec supports slice-based (or partition-based) multithreading.
1262 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1264 * Codec supports changed parameters at any point.
1266 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1268 * Codec supports avctx->thread_count == 0 (auto).
1270 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1272 * Audio encoder supports receiving a different number of samples in each call.
1274 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1276 * Codec is intra only.
1278 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1280 * Codec is lossless.
1282 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1285 * HWAccel is experimental and is thus avoided in favor of non experimental
1288 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1289 #endif /* FF_API_WITHOUT_PREFIX */
1292 //The following defines may change, don't expect compatibility if you use them.
1293 #define MB_TYPE_INTRA4x4 0x0001
1294 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1295 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1296 #define MB_TYPE_16x16 0x0008
1297 #define MB_TYPE_16x8 0x0010
1298 #define MB_TYPE_8x16 0x0020
1299 #define MB_TYPE_8x8 0x0040
1300 #define MB_TYPE_INTERLACED 0x0080
1301 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1302 #define MB_TYPE_ACPRED 0x0200
1303 #define MB_TYPE_GMC 0x0400
1304 #define MB_TYPE_SKIP 0x0800
1305 #define MB_TYPE_P0L0 0x1000
1306 #define MB_TYPE_P1L0 0x2000
1307 #define MB_TYPE_P0L1 0x4000
1308 #define MB_TYPE_P1L1 0x8000
1309 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1310 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1311 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1312 #define MB_TYPE_QUANT 0x00010000
1313 #define MB_TYPE_CBP 0x00020000
1314 // Note bits 24-31 are reserved for codec specific use (H.264 ref0, MPEG-1 0mv, ...)
1319 * This specifies the area which should be displayed.
1320 * Note there may be multiple such areas for one frame.
1322 typedef struct AVPanScan{
1325 * - encoding: Set by user.
1326 * - decoding: Set by libavcodec.
1331 * width and height in 1/16 pel
1332 * - encoding: Set by user.
1333 * - decoding: Set by libavcodec.
1339 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1340 * - encoding: Set by user.
1341 * - decoding: Set by libavcodec.
1343 int16_t position[3][2];
1347 * This structure describes the bitrate properties of an encoded bitstream. It
1348 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1349 * parameters for H.264/HEVC.
1351 typedef struct AVCPBProperties {
1353 * Maximum bitrate of the stream, in bits per second.
1354 * Zero if unknown or unspecified.
1358 * Minimum bitrate of the stream, in bits per second.
1359 * Zero if unknown or unspecified.
1363 * Average bitrate of the stream, in bits per second.
1364 * Zero if unknown or unspecified.
1369 * The size of the buffer to which the ratecontrol is applied, in bits.
1370 * Zero if unknown or unspecified.
1375 * The delay between the time the packet this structure is associated with
1376 * is received and the time when it should be decoded, in periods of a 27MHz
1379 * UINT64_MAX when unknown or unspecified.
1384 #if FF_API_QSCALE_TYPE
1385 #define FF_QSCALE_TYPE_MPEG1 0
1386 #define FF_QSCALE_TYPE_MPEG2 1
1387 #define FF_QSCALE_TYPE_H264 2
1388 #define FF_QSCALE_TYPE_VP56 3
1392 * The decoder will keep a reference to the frame and may reuse it later.
1394 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1397 * @defgroup lavc_packet AVPacket
1399 * Types and functions for working with AVPacket.
1402 enum AVPacketSideDataType {
1404 * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1405 * bytes worth of palette. This side data signals that a new palette is
1408 AV_PKT_DATA_PALETTE,
1411 * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1412 * that the extradata buffer was changed and the receiving side should
1413 * act upon it appropriately. The new extradata is embedded in the side
1414 * data buffer and should be immediately used for processing the current
1417 AV_PKT_DATA_NEW_EXTRADATA,
1420 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1423 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1424 * s32le channel_count
1425 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1426 * u64le channel_layout
1427 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1429 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1434 AV_PKT_DATA_PARAM_CHANGE,
1437 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1438 * structures with info about macroblocks relevant to splitting the
1439 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1440 * That is, it does not necessarily contain info about all macroblocks,
1441 * as long as the distance between macroblocks in the info is smaller
1442 * than the target payload size.
1443 * Each MB info structure is 12 bytes, and is laid out as follows:
1445 * u32le bit offset from the start of the packet
1446 * u8 current quantizer at the start of the macroblock
1448 * u16le macroblock address within the GOB
1449 * u8 horizontal MV predictor
1450 * u8 vertical MV predictor
1451 * u8 horizontal MV predictor for block number 3
1452 * u8 vertical MV predictor for block number 3
1455 AV_PKT_DATA_H263_MB_INFO,
1458 * This side data should be associated with an audio stream and contains
1459 * ReplayGain information in form of the AVReplayGain struct.
1461 AV_PKT_DATA_REPLAYGAIN,
1464 * This side data contains a 3x3 transformation matrix describing an affine
1465 * transformation that needs to be applied to the decoded video frames for
1466 * correct presentation.
1468 * See libavutil/display.h for a detailed description of the data.
1470 AV_PKT_DATA_DISPLAYMATRIX,
1473 * This side data should be associated with a video stream and contains
1474 * Stereoscopic 3D information in form of the AVStereo3D struct.
1476 AV_PKT_DATA_STEREO3D,
1479 * This side data should be associated with an audio stream and corresponds
1480 * to enum AVAudioServiceType.
1482 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1485 * This side data contains quality related information from the encoder.
1487 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1491 * u64le[error count] sum of squared differences between encoder in and output
1494 AV_PKT_DATA_QUALITY_STATS,
1497 * This side data contains an integer value representing the stream index
1498 * of a "fallback" track. A fallback track indicates an alternate
1499 * track to use when the current track can not be decoded for some reason.
1500 * e.g. no decoder available for codec.
1502 AV_PKT_DATA_FALLBACK_TRACK,
1505 * This side data corresponds to the AVCPBProperties struct.
1507 AV_PKT_DATA_CPB_PROPERTIES,
1510 * Recommmends skipping the specified number of samples
1512 * u32le number of samples to skip from start of this packet
1513 * u32le number of samples to skip from end of this packet
1514 * u8 reason for start skip
1515 * u8 reason for end skip (0=padding silence, 1=convergence)
1518 AV_PKT_DATA_SKIP_SAMPLES=70,
1521 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1522 * the packet may contain "dual mono" audio specific to Japanese DTV
1523 * and if it is true, recommends only the selected channel to be used.
1525 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1528 AV_PKT_DATA_JP_DUALMONO,
1531 * A list of zero terminated key/value strings. There is no end marker for
1532 * the list, so it is required to rely on the side data size to stop.
1534 AV_PKT_DATA_STRINGS_METADATA,
1537 * Subtitle event position
1545 AV_PKT_DATA_SUBTITLE_POSITION,
1548 * Data found in BlockAdditional element of matroska container. There is
1549 * no end marker for the data, so it is required to rely on the side data
1550 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1553 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1556 * The optional first identifier line of a WebVTT cue.
1558 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1561 * The optional settings (rendering instructions) that immediately
1562 * follow the timestamp specifier of a WebVTT cue.
1564 AV_PKT_DATA_WEBVTT_SETTINGS,
1567 * A list of zero terminated key/value strings. There is no end marker for
1568 * the list, so it is required to rely on the side data size to stop. This
1569 * side data includes updated metadata which appeared in the stream.
1571 AV_PKT_DATA_METADATA_UPDATE,
1574 * MPEGTS stream ID, this is required to pass the stream ID
1575 * information from the demuxer to the corresponding muxer.
1577 AV_PKT_DATA_MPEGTS_STREAM_ID,
1580 * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1581 * should be associated with a video stream and contains data in the form
1582 * of the AVMasteringDisplayMetadata struct.
1584 AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
1587 * This side data should be associated with a video stream and corresponds
1588 * to the AVSphericalMapping structure.
1590 AV_PKT_DATA_SPHERICAL,
1593 * Content light level (based on CTA-861.3). This metadata should be
1594 * associated with a video stream and contains data in the form of the
1595 * AVContentLightMetadata struct.
1597 AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
1600 * The number of side data elements (in fact a bit more than it).
1601 * This is not part of the public API/ABI in the sense that it may
1602 * change when new side data types are added.
1603 * This must stay the last enum value.
1604 * If its value becomes huge, some code using it
1605 * needs to be updated as it assumes it to be smaller than other limits.
1610 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1612 typedef struct AVPacketSideData {
1615 enum AVPacketSideDataType type;
1619 * This structure stores compressed data. It is typically exported by demuxers
1620 * and then passed as input to decoders, or received as output from encoders and
1621 * then passed to muxers.
1623 * For video, it should typically contain one compressed frame. For audio it may
1624 * contain several compressed frames. Encoders are allowed to output empty
1625 * packets, with no compressed data, containing only side data
1626 * (e.g. to update some stream parameters at the end of encoding).
1628 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1629 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1630 * without libavcodec and libavformat major bump.
1632 * The semantics of data ownership depends on the buf field.
1633 * If it is set, the packet data is dynamically allocated and is
1634 * valid indefinitely until a call to av_packet_unref() reduces the
1635 * reference count to 0.
1637 * If the buf field is not set av_packet_ref() would make a copy instead
1638 * of increasing the reference count.
1640 * The side data is always allocated with av_malloc(), copied by
1641 * av_packet_ref() and freed by av_packet_unref().
1643 * @see av_packet_ref
1644 * @see av_packet_unref
1646 typedef struct AVPacket {
1648 * A reference to the reference-counted buffer where the packet data is
1650 * May be NULL, then the packet data is not reference-counted.
1654 * Presentation timestamp in AVStream->time_base units; the time at which
1655 * the decompressed packet will be presented to the user.
1656 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1657 * pts MUST be larger or equal to dts as presentation cannot happen before
1658 * decompression, unless one wants to view hex dumps. Some formats misuse
1659 * the terms dts and pts/cts to mean something different. Such timestamps
1660 * must be converted to true pts/dts before they are stored in AVPacket.
1664 * Decompression timestamp in AVStream->time_base units; the time at which
1665 * the packet is decompressed.
1666 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1673 * A combination of AV_PKT_FLAG values
1677 * Additional packet data that can be provided by the container.
1678 * Packet can contain several types of side information.
1680 AVPacketSideData *side_data;
1681 int side_data_elems;
1684 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1685 * Equals next_pts - this_pts in presentation order.
1689 int64_t pos; ///< byte position in stream, -1 if unknown
1691 #if FF_API_CONVERGENCE_DURATION
1693 * @deprecated Same as the duration field, but as int64_t. This was required
1694 * for Matroska subtitles, whose duration values could overflow when the
1695 * duration field was still an int.
1697 attribute_deprecated
1698 int64_t convergence_duration;
1701 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1702 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1704 * Flag is used to discard packets which are required to maintain valid
1705 * decoder state but are not required for output and should be dropped
1708 #define AV_PKT_FLAG_DISCARD 0x0004
1710 enum AVSideDataParamChangeFlags {
1711 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1712 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1713 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1714 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1720 struct AVCodecInternal;
1724 AV_FIELD_PROGRESSIVE,
1725 AV_FIELD_TT, //< Top coded_first, top displayed first
1726 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1727 AV_FIELD_TB, //< Top coded first, bottom displayed first
1728 AV_FIELD_BT, //< Bottom coded first, top displayed first
1732 * main external API structure.
1733 * New fields can be added to the end with minor version bumps.
1734 * Removal, reordering and changes to existing fields require a major
1736 * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1738 * The name string for AVOptions options matches the associated command line
1739 * parameter name and can be found in libavcodec/options_table.h
1740 * The AVOption/command line parameter names differ in some cases from the C
1741 * structure field names for historic reasons or brevity.
1742 * sizeof(AVCodecContext) must not be used outside libav*.
1744 typedef struct AVCodecContext {
1746 * information on struct for av_log
1747 * - set by avcodec_alloc_context3
1749 const AVClass *av_class;
1750 int log_level_offset;
1752 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1753 const struct AVCodec *codec;
1754 #if FF_API_CODEC_NAME
1756 * @deprecated this field is not used for anything in libavcodec
1758 attribute_deprecated
1759 char codec_name[32];
1761 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1764 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1765 * This is used to work around some encoder bugs.
1766 * A demuxer should set this to what is stored in the field used to identify the codec.
1767 * If there are multiple such fields in a container then the demuxer should choose the one
1768 * which maximizes the information about the used codec.
1769 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1770 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1771 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1773 * - encoding: Set by user, if not then the default based on codec_id will be used.
1774 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1776 unsigned int codec_tag;
1778 #if FF_API_STREAM_CODEC_TAG
1780 * @deprecated this field is unused
1782 attribute_deprecated
1783 unsigned int stream_codec_tag;
1789 * Private context used for internal data.
1791 * Unlike priv_data, this is not codec-specific. It is used in general
1792 * libavcodec functions.
1794 struct AVCodecInternal *internal;
1797 * Private data of the user, can be used to carry app specific stuff.
1798 * - encoding: Set by user.
1799 * - decoding: Set by user.
1804 * the average bitrate
1805 * - encoding: Set by user; unused for constant quantizer encoding.
1806 * - decoding: Set by user, may be overwritten by libavcodec
1807 * if this info is available in the stream
1812 * number of bits the bitstream is allowed to diverge from the reference.
1813 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1814 * - encoding: Set by user; unused for constant quantizer encoding.
1815 * - decoding: unused
1817 int bit_rate_tolerance;
1820 * Global quality for codecs which cannot change it per frame.
1821 * This should be proportional to MPEG-1/2/4 qscale.
1822 * - encoding: Set by user.
1823 * - decoding: unused
1828 * - encoding: Set by user.
1829 * - decoding: unused
1831 int compression_level;
1832 #define FF_COMPRESSION_DEFAULT -1
1836 * - encoding: Set by user.
1837 * - decoding: Set by user.
1843 * - encoding: Set by user.
1844 * - decoding: Set by user.
1849 * some codecs need / can use extradata like Huffman tables.
1850 * MJPEG: Huffman tables
1851 * rv10: additional flags
1852 * MPEG-4: global headers (they can be in the bitstream or here)
1853 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1854 * than extradata_size to avoid problems if it is read with the bitstream reader.
1855 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1856 * - encoding: Set/allocated/freed by libavcodec.
1857 * - decoding: Set/allocated/freed by user.
1863 * This is the fundamental unit of time (in seconds) in terms
1864 * of which frame timestamps are represented. For fixed-fps content,
1865 * timebase should be 1/framerate and timestamp increments should be
1867 * This often, but not always is the inverse of the frame rate or field rate
1868 * for video. 1/time_base is not the average frame rate if the frame rate is not
1871 * Like containers, elementary streams also can store timestamps, 1/time_base
1872 * is the unit in which these timestamps are specified.
1873 * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1874 * vop_time_increment_resolution and fixed_vop_rate
1875 * (fixed_vop_rate == 0 implies that it is different from the framerate)
1877 * - encoding: MUST be set by user.
1878 * - decoding: the use of this field for decoding is deprecated.
1879 * Use framerate instead.
1881 AVRational time_base;
1884 * For some codecs, the time base is closer to the field rate than the frame rate.
1885 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1886 * if no telecine is used ...
1888 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1890 int ticks_per_frame;
1895 * Encoding: Number of frames delay there will be from the encoder input to
1896 * the decoder output. (we assume the decoder matches the spec)
1897 * Decoding: Number of frames delay in addition to what a standard decoder
1898 * as specified in the spec would produce.
1901 * Number of frames the decoded output will be delayed relative to the
1905 * For encoding, this field is unused (see initial_padding).
1907 * For decoding, this is the number of samples the decoder needs to
1908 * output before the decoder's output is valid. When seeking, you should
1909 * start decoding this many samples prior to your desired seek point.
1911 * - encoding: Set by libavcodec.
1912 * - decoding: Set by libavcodec.
1919 * picture width / height.
1921 * @note Those fields may not match the values of the last
1922 * AVFrame output by avcodec_decode_video2 due frame
1925 * - encoding: MUST be set by user.
1926 * - decoding: May be set by the user before opening the decoder if known e.g.
1927 * from the container. Some decoders will require the dimensions
1928 * to be set by the caller. During decoding, the decoder may
1929 * overwrite those values as required while parsing the data.
1934 * Bitstream width / height, may be different from width/height e.g. when
1935 * the decoded frame is cropped before being output or lowres is enabled.
1937 * @note Those field may not match the value of the last
1938 * AVFrame output by avcodec_receive_frame() due frame
1941 * - encoding: unused
1942 * - decoding: May be set by the user before opening the decoder if known
1943 * e.g. from the container. During decoding, the decoder may
1944 * overwrite those values as required while parsing the data.
1946 int coded_width, coded_height;
1948 #if FF_API_ASPECT_EXTENDED
1949 #define FF_ASPECT_EXTENDED 15
1953 * the number of pictures in a group of pictures, or 0 for intra_only
1954 * - encoding: Set by user.
1955 * - decoding: unused
1960 * Pixel format, see AV_PIX_FMT_xxx.
1961 * May be set by the demuxer if known from headers.
1962 * May be overridden by the decoder if it knows better.
1964 * @note This field may not match the value of the last
1965 * AVFrame output by avcodec_receive_frame() due frame
1968 * - encoding: Set by user.
1969 * - decoding: Set by user if known, overridden by libavcodec while
1972 enum AVPixelFormat pix_fmt;
1974 #if FF_API_MOTION_EST
1976 * This option does nothing
1977 * @deprecated use codec private options instead
1979 attribute_deprecated int me_method;
1983 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1984 * decoder to draw a horizontal band. It improves cache usage. Not
1985 * all codecs can do that. You must check the codec capabilities
1987 * When multithreading is used, it may be called from multiple threads
1988 * at the same time; threads might draw different parts of the same AVFrame,
1989 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1991 * The function is also used by hardware acceleration APIs.
1992 * It is called at least once during frame decoding to pass
1993 * the data needed for hardware render.
1994 * In that mode instead of pixel data, AVFrame points to
1995 * a structure specific to the acceleration API. The application
1996 * reads the structure and can change some fields to indicate progress
1998 * - encoding: unused
1999 * - decoding: Set by user.
2000 * @param height the height of the slice
2001 * @param y the y position of the slice
2002 * @param type 1->top field, 2->bottom field, 3->frame
2003 * @param offset offset into the AVFrame.data from which the slice should be read
2005 void (*draw_horiz_band)(struct AVCodecContext *s,
2006 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
2007 int y, int type, int height);
2010 * callback to negotiate the pixelFormat
2011 * @param fmt is the list of formats which are supported by the codec,
2012 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
2013 * The first is always the native one.
2014 * @note The callback may be called again immediately if initialization for
2015 * the selected (hardware-accelerated) pixel format failed.
2016 * @warning Behavior is undefined if the callback returns a value not
2017 * in the fmt list of formats.
2018 * @return the chosen format
2019 * - encoding: unused
2020 * - decoding: Set by user, if not set the native format will be chosen.
2022 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
2025 * maximum number of B-frames between non-B-frames
2026 * Note: The output will be delayed by max_b_frames+1 relative to the input.
2027 * - encoding: Set by user.
2028 * - decoding: unused
2033 * qscale factor between IP and B-frames
2034 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
2035 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
2036 * - encoding: Set by user.
2037 * - decoding: unused
2039 float b_quant_factor;
2041 #if FF_API_RC_STRATEGY
2042 /** @deprecated use codec private option instead */
2043 attribute_deprecated int rc_strategy;
2044 #define FF_RC_STRATEGY_XVID 1
2047 #if FF_API_PRIVATE_OPT
2048 /** @deprecated use encoder private options instead */
2049 attribute_deprecated
2050 int b_frame_strategy;
2054 * qscale offset between IP and B-frames
2055 * - encoding: Set by user.
2056 * - decoding: unused
2058 float b_quant_offset;
2061 * Size of the frame reordering buffer in the decoder.
2062 * For MPEG-2 it is 1 IPB or 0 low delay IP.
2063 * - encoding: Set by libavcodec.
2064 * - decoding: Set by libavcodec.
2068 #if FF_API_PRIVATE_OPT
2069 /** @deprecated use encoder private options instead */
2070 attribute_deprecated
2075 * qscale factor between P- and I-frames
2076 * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
2077 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
2078 * - encoding: Set by user.
2079 * - decoding: unused
2081 float i_quant_factor;
2084 * qscale offset between P and I-frames
2085 * - encoding: Set by user.
2086 * - decoding: unused
2088 float i_quant_offset;
2091 * luminance masking (0-> disabled)
2092 * - encoding: Set by user.
2093 * - decoding: unused
2098 * temporary complexity masking (0-> disabled)
2099 * - encoding: Set by user.
2100 * - decoding: unused
2102 float temporal_cplx_masking;
2105 * spatial complexity masking (0-> disabled)
2106 * - encoding: Set by user.
2107 * - decoding: unused
2109 float spatial_cplx_masking;
2112 * p block masking (0-> disabled)
2113 * - encoding: Set by user.
2114 * - decoding: unused
2119 * darkness masking (0-> disabled)
2120 * - encoding: Set by user.
2121 * - decoding: unused
2127 * - encoding: Set by libavcodec.
2128 * - decoding: Set by user (or 0).
2132 #if FF_API_PRIVATE_OPT
2133 /** @deprecated use encoder private options instead */
2134 attribute_deprecated
2135 int prediction_method;
2136 #define FF_PRED_LEFT 0
2137 #define FF_PRED_PLANE 1
2138 #define FF_PRED_MEDIAN 2
2142 * slice offsets in the frame in bytes
2143 * - encoding: Set/allocated by libavcodec.
2144 * - decoding: Set/allocated by user (or NULL).
2149 * sample aspect ratio (0 if unknown)
2150 * That is the width of a pixel divided by the height of the pixel.
2151 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
2152 * - encoding: Set by user.
2153 * - decoding: Set by libavcodec.
2155 AVRational sample_aspect_ratio;
2158 * motion estimation comparison function
2159 * - encoding: Set by user.
2160 * - decoding: unused
2164 * subpixel motion estimation comparison function
2165 * - encoding: Set by user.
2166 * - decoding: unused
2170 * macroblock comparison function (not supported yet)
2171 * - encoding: Set by user.
2172 * - decoding: unused
2176 * interlaced DCT comparison function
2177 * - encoding: Set by user.
2178 * - decoding: unused
2181 #define FF_CMP_SAD 0
2182 #define FF_CMP_SSE 1
2183 #define FF_CMP_SATD 2
2184 #define FF_CMP_DCT 3
2185 #define FF_CMP_PSNR 4
2186 #define FF_CMP_BIT 5
2188 #define FF_CMP_ZERO 7
2189 #define FF_CMP_VSAD 8
2190 #define FF_CMP_VSSE 9
2191 #define FF_CMP_NSSE 10
2192 #define FF_CMP_W53 11
2193 #define FF_CMP_W97 12
2194 #define FF_CMP_DCTMAX 13
2195 #define FF_CMP_DCT264 14
2196 #define FF_CMP_MEDIAN_SAD 15
2197 #define FF_CMP_CHROMA 256
2200 * ME diamond size & shape
2201 * - encoding: Set by user.
2202 * - decoding: unused
2207 * amount of previous MV predictors (2a+1 x 2a+1 square)
2208 * - encoding: Set by user.
2209 * - decoding: unused
2211 int last_predictor_count;
2213 #if FF_API_PRIVATE_OPT
2214 /** @deprecated use encoder private options instead */
2215 attribute_deprecated
2220 * motion estimation prepass comparison function
2221 * - encoding: Set by user.
2222 * - decoding: unused
2227 * ME prepass diamond size & shape
2228 * - encoding: Set by user.
2229 * - decoding: unused
2235 * - encoding: Set by user.
2236 * - decoding: unused
2238 int me_subpel_quality;
2242 * DTG active format information (additional aspect ratio
2243 * information only used in DVB MPEG-2 transport streams)
2246 * - encoding: unused
2247 * - decoding: Set by decoder.
2248 * @deprecated Deprecated in favor of AVSideData
2250 attribute_deprecated int dtg_active_format;
2251 #define FF_DTG_AFD_SAME 8
2252 #define FF_DTG_AFD_4_3 9
2253 #define FF_DTG_AFD_16_9 10
2254 #define FF_DTG_AFD_14_9 11
2255 #define FF_DTG_AFD_4_3_SP_14_9 13
2256 #define FF_DTG_AFD_16_9_SP_14_9 14
2257 #define FF_DTG_AFD_SP_4_3 15
2258 #endif /* FF_API_AFD */
2261 * maximum motion estimation search range in subpel units
2262 * If 0 then no limit.
2264 * - encoding: Set by user.
2265 * - decoding: unused
2269 #if FF_API_QUANT_BIAS
2271 * @deprecated use encoder private option instead
2273 attribute_deprecated int intra_quant_bias;
2274 #define FF_DEFAULT_QUANT_BIAS 999999
2277 * @deprecated use encoder private option instead
2279 attribute_deprecated int inter_quant_bias;
2284 * - encoding: unused
2285 * - decoding: Set by user.
2288 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2289 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
2290 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2294 * XVideo Motion Acceleration
2295 * - encoding: forbidden
2296 * - decoding: set by decoder
2297 * @deprecated XvMC doesn't need it anymore.
2299 attribute_deprecated int xvmc_acceleration;
2300 #endif /* FF_API_XVMC */
2303 * macroblock decision mode
2304 * - encoding: Set by user.
2305 * - decoding: unused
2308 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2309 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2310 #define FF_MB_DECISION_RD 2 ///< rate distortion
2313 * custom intra quantization matrix
2314 * - encoding: Set by user, can be NULL.
2315 * - decoding: Set by libavcodec.
2317 uint16_t *intra_matrix;
2320 * custom inter quantization matrix
2321 * - encoding: Set by user, can be NULL.
2322 * - decoding: Set by libavcodec.
2324 uint16_t *inter_matrix;
2326 #if FF_API_PRIVATE_OPT
2327 /** @deprecated use encoder private options instead */
2328 attribute_deprecated
2329 int scenechange_threshold;
2331 /** @deprecated use encoder private options instead */
2332 attribute_deprecated
2333 int noise_reduction;
2338 * @deprecated this field is unused
2340 attribute_deprecated
2344 * @deprecated this field is unused
2346 attribute_deprecated
2351 * precision of the intra DC coefficient - 8
2352 * - encoding: Set by user.
2353 * - decoding: Set by libavcodec
2355 int intra_dc_precision;
2358 * Number of macroblock rows at the top which are skipped.
2359 * - encoding: unused
2360 * - decoding: Set by user.
2365 * Number of macroblock rows at the bottom which are skipped.
2366 * - encoding: unused
2367 * - decoding: Set by user.
2373 * @deprecated use encoder private options instead
2375 attribute_deprecated
2376 float border_masking;
2380 * minimum MB Lagrange multiplier
2381 * - encoding: Set by user.
2382 * - decoding: unused
2387 * maximum MB Lagrange multiplier
2388 * - encoding: Set by user.
2389 * - decoding: unused
2393 #if FF_API_PRIVATE_OPT
2395 * @deprecated use encoder private options instead
2397 attribute_deprecated
2398 int me_penalty_compensation;
2402 * - encoding: Set by user.
2403 * - decoding: unused
2407 #if FF_API_PRIVATE_OPT
2408 /** @deprecated use encoder private options instead */
2409 attribute_deprecated
2415 * - encoding: Set by user.
2416 * - decoding: unused
2421 * number of reference frames
2422 * - encoding: Set by user.
2423 * - decoding: Set by lavc.
2427 #if FF_API_PRIVATE_OPT
2428 /** @deprecated use encoder private options instead */
2429 attribute_deprecated
2433 #if FF_API_UNUSED_MEMBERS
2435 * Multiplied by qscale for each frame and added to scene_change_score.
2436 * - encoding: Set by user.
2437 * - decoding: unused
2439 attribute_deprecated int scenechange_factor;
2443 * Note: Value depends upon the compare function used for fullpel ME.
2444 * - encoding: Set by user.
2445 * - decoding: unused
2449 #if FF_API_PRIVATE_OPT
2450 /** @deprecated use encoder private options instead */
2451 attribute_deprecated
2456 * Chromaticity coordinates of the source primaries.
2457 * - encoding: Set by user
2458 * - decoding: Set by libavcodec
2460 enum AVColorPrimaries color_primaries;
2463 * Color Transfer Characteristic.
2464 * - encoding: Set by user
2465 * - decoding: Set by libavcodec
2467 enum AVColorTransferCharacteristic color_trc;
2470 * YUV colorspace type.
2471 * - encoding: Set by user
2472 * - decoding: Set by libavcodec
2474 enum AVColorSpace colorspace;
2477 * MPEG vs JPEG YUV range.
2478 * - encoding: Set by user
2479 * - decoding: Set by libavcodec
2481 enum AVColorRange color_range;
2484 * This defines the location of chroma samples.
2485 * - encoding: Set by user
2486 * - decoding: Set by libavcodec
2488 enum AVChromaLocation chroma_sample_location;
2492 * Indicates number of picture subdivisions. Used for parallelized
2494 * - encoding: Set by user
2495 * - decoding: unused
2500 * - encoding: set by libavcodec
2501 * - decoding: Set by user.
2503 enum AVFieldOrder field_order;
2506 int sample_rate; ///< samples per second
2507 int channels; ///< number of audio channels
2510 * audio sample format
2511 * - encoding: Set by user.
2512 * - decoding: Set by libavcodec.
2514 enum AVSampleFormat sample_fmt; ///< sample format
2516 /* The following data should not be initialized. */
2518 * Number of samples per channel in an audio frame.
2520 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2521 * except the last must contain exactly frame_size samples per channel.
2522 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2523 * frame size is not restricted.
2524 * - decoding: may be set by some decoders to indicate constant frame size
2529 * Frame counter, set by libavcodec.
2531 * - decoding: total number of frames returned from the decoder so far.
2532 * - encoding: total number of frames passed to the encoder so far.
2534 * @note the counter is not incremented if encoding/decoding resulted in
2540 * number of bytes per packet if constant and known or 0
2541 * Used by some WAV based audio codecs.
2546 * Audio cutoff bandwidth (0 means "automatic")
2547 * - encoding: Set by user.
2548 * - decoding: unused
2553 * Audio channel layout.
2554 * - encoding: set by user.
2555 * - decoding: set by user, may be overwritten by libavcodec.
2557 uint64_t channel_layout;
2560 * Request decoder to use this channel layout if it can (0 for default)
2561 * - encoding: unused
2562 * - decoding: Set by user.
2564 uint64_t request_channel_layout;
2567 * Type of service that the audio stream conveys.
2568 * - encoding: Set by user.
2569 * - decoding: Set by libavcodec.
2571 enum AVAudioServiceType audio_service_type;
2574 * desired sample format
2575 * - encoding: Not used.
2576 * - decoding: Set by user.
2577 * Decoder will decode to this format if it can.
2579 enum AVSampleFormat request_sample_fmt;
2582 * This callback is called at the beginning of each frame to get data
2583 * buffer(s) for it. There may be one contiguous buffer for all the data or
2584 * there may be a buffer per each data plane or anything in between. What
2585 * this means is, you may set however many entries in buf[] you feel necessary.
2586 * Each buffer must be reference-counted using the AVBuffer API (see description
2589 * The following fields will be set in the frame before this callback is
2592 * - width, height (video only)
2593 * - sample_rate, channel_layout, nb_samples (audio only)
2594 * Their values may differ from the corresponding values in
2595 * AVCodecContext. This callback must use the frame values, not the codec
2596 * context values, to calculate the required buffer size.
2598 * This callback must fill the following fields in the frame:
2602 * * if the data is planar audio with more than 8 channels, then this
2603 * callback must allocate and fill extended_data to contain all pointers
2604 * to all data planes. data[] must hold as many pointers as it can.
2605 * extended_data must be allocated with av_malloc() and will be freed in
2607 * * otherwise extended_data must point to data
2608 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2609 * the frame's data and extended_data pointers must be contained in these. That
2610 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2611 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2612 * and av_buffer_ref().
2613 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2614 * this callback and filled with the extra buffers if there are more
2615 * buffers than buf[] can hold. extended_buf will be freed in
2618 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2619 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2622 * Each data plane must be aligned to the maximum required by the target
2625 * @see avcodec_default_get_buffer2()
2629 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2630 * (read and/or written to if it is writable) later by libavcodec.
2632 * avcodec_align_dimensions2() should be used to find the required width and
2633 * height, as they normally need to be rounded up to the next multiple of 16.
2635 * Some decoders do not support linesizes changing between frames.
2637 * If frame multithreading is used and thread_safe_callbacks is set,
2638 * this callback may be called from a different thread, but not from more
2639 * than one at once. Does not need to be reentrant.
2641 * @see avcodec_align_dimensions2()
2645 * Decoders request a buffer of a particular size by setting
2646 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2647 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2648 * to a smaller value in the output frame.
2650 * As a convenience, av_samples_get_buffer_size() and
2651 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2652 * functions to find the required data size and to fill data pointers and
2653 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2654 * since all planes must be the same size.
2656 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2658 * - encoding: unused
2659 * - decoding: Set by libavcodec, user can override.
2661 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2664 * If non-zero, the decoded audio and video frames returned from
2665 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2666 * and are valid indefinitely. The caller must free them with
2667 * av_frame_unref() when they are not needed anymore.
2668 * Otherwise, the decoded frames must not be freed by the caller and are
2669 * only valid until the next decode call.
2671 * This is always automatically enabled if avcodec_receive_frame() is used.
2673 * - encoding: unused
2674 * - decoding: set by the caller before avcodec_open2().
2676 int refcounted_frames;
2678 /* - encoding parameters */
2679 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2680 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2684 * - encoding: Set by user.
2685 * - decoding: unused
2691 * - encoding: Set by user.
2692 * - decoding: unused
2697 * maximum quantizer difference between frames
2698 * - encoding: Set by user.
2699 * - decoding: unused
2705 * @deprecated use encoder private options instead
2707 attribute_deprecated
2710 attribute_deprecated
2712 attribute_deprecated
2717 * decoder bitstream buffer size
2718 * - encoding: Set by user.
2719 * - decoding: unused
2724 * ratecontrol override, see RcOverride
2725 * - encoding: Allocated/set/freed by user.
2726 * - decoding: unused
2728 int rc_override_count;
2729 RcOverride *rc_override;
2733 * @deprecated use encoder private options instead
2735 attribute_deprecated
2741 * - encoding: Set by user.
2742 * - decoding: Set by user, may be overwritten by libavcodec.
2744 int64_t rc_max_rate;
2748 * - encoding: Set by user.
2749 * - decoding: unused
2751 int64_t rc_min_rate;
2755 * @deprecated use encoder private options instead
2757 attribute_deprecated
2758 float rc_buffer_aggressivity;
2760 attribute_deprecated
2761 float rc_initial_cplx;
2765 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2766 * - encoding: Set by user.
2767 * - decoding: unused.
2769 float rc_max_available_vbv_use;
2772 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2773 * - encoding: Set by user.
2774 * - decoding: unused.
2776 float rc_min_vbv_overflow_use;
2779 * Number of bits which should be loaded into the rc buffer before decoding starts.
2780 * - encoding: Set by user.
2781 * - decoding: unused
2783 int rc_initial_buffer_occupancy;
2785 #if FF_API_CODER_TYPE
2786 #define FF_CODER_TYPE_VLC 0
2787 #define FF_CODER_TYPE_AC 1
2788 #define FF_CODER_TYPE_RAW 2
2789 #define FF_CODER_TYPE_RLE 3
2790 #if FF_API_UNUSED_MEMBERS
2791 #define FF_CODER_TYPE_DEFLATE 4
2792 #endif /* FF_API_UNUSED_MEMBERS */
2794 * @deprecated use encoder private options instead
2796 attribute_deprecated
2798 #endif /* FF_API_CODER_TYPE */
2800 #if FF_API_PRIVATE_OPT
2801 /** @deprecated use encoder private options instead */
2802 attribute_deprecated
2808 * @deprecated use encoder private options instead
2810 attribute_deprecated
2814 * @deprecated use encoder private options instead
2816 attribute_deprecated
2820 #if FF_API_PRIVATE_OPT
2821 /** @deprecated use encoder private options instead */
2822 attribute_deprecated
2823 int frame_skip_threshold;
2825 /** @deprecated use encoder private options instead */
2826 attribute_deprecated
2827 int frame_skip_factor;
2829 /** @deprecated use encoder private options instead */
2830 attribute_deprecated
2833 /** @deprecated use encoder private options instead */
2834 attribute_deprecated
2836 #endif /* FF_API_PRIVATE_OPT */
2839 * trellis RD quantization
2840 * - encoding: Set by user.
2841 * - decoding: unused
2845 #if FF_API_PRIVATE_OPT
2846 /** @deprecated use encoder private options instead */
2847 attribute_deprecated
2848 int min_prediction_order;
2850 /** @deprecated use encoder private options instead */
2851 attribute_deprecated
2852 int max_prediction_order;
2854 /** @deprecated use encoder private options instead */
2855 attribute_deprecated
2856 int64_t timecode_frame_start;
2859 #if FF_API_RTP_CALLBACK
2861 * @deprecated unused
2863 /* The RTP callback: This function is called */
2864 /* every time the encoder has a packet to send. */
2865 /* It depends on the encoder if the data starts */
2866 /* with a Start Code (it should). H.263 does. */
2867 /* mb_nb contains the number of macroblocks */
2868 /* encoded in the RTP payload. */
2869 attribute_deprecated
2870 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2873 #if FF_API_PRIVATE_OPT
2874 /** @deprecated use encoder private options instead */
2875 attribute_deprecated
2876 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2877 /* do its best to deliver a chunk with size */
2878 /* below rtp_payload_size, the chunk will start */
2879 /* with a start code on some codecs like H.263. */
2880 /* This doesn't take account of any particular */
2881 /* headers inside the transmitted RTP payload. */
2884 #if FF_API_STAT_BITS
2885 /* statistics, used for 2-pass encoding */
2886 attribute_deprecated
2888 attribute_deprecated
2890 attribute_deprecated
2892 attribute_deprecated
2894 attribute_deprecated
2896 attribute_deprecated
2898 attribute_deprecated
2900 attribute_deprecated
2903 /** @deprecated this field is unused */
2904 attribute_deprecated
2909 * pass1 encoding statistics output buffer
2910 * - encoding: Set by libavcodec.
2911 * - decoding: unused
2916 * pass2 encoding statistics input buffer
2917 * Concatenated stuff from stats_out of pass1 should be placed here.
2918 * - encoding: Allocated/set/freed by user.
2919 * - decoding: unused
2924 * Work around bugs in encoders which sometimes cannot be detected automatically.
2925 * - encoding: Set by user
2926 * - decoding: Set by user
2928 int workaround_bugs;
2929 #define FF_BUG_AUTODETECT 1 ///< autodetection
2930 #if FF_API_OLD_MSMPEG4
2931 #define FF_BUG_OLD_MSMPEG4 2
2933 #define FF_BUG_XVID_ILACE 4
2934 #define FF_BUG_UMP4 8
2935 #define FF_BUG_NO_PADDING 16
2936 #define FF_BUG_AMV 32
2938 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2940 #define FF_BUG_QPEL_CHROMA 64
2941 #define FF_BUG_STD_QPEL 128
2942 #define FF_BUG_QPEL_CHROMA2 256
2943 #define FF_BUG_DIRECT_BLOCKSIZE 512
2944 #define FF_BUG_EDGE 1024
2945 #define FF_BUG_HPEL_CHROMA 2048
2946 #define FF_BUG_DC_CLIP 4096
2947 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2948 #define FF_BUG_TRUNCATED 16384
2949 #define FF_BUG_IEDGE 32768
2952 * strictly follow the standard (MPEG-4, ...).
2953 * - encoding: Set by user.
2954 * - decoding: Set by user.
2955 * Setting this to STRICT or higher means the encoder and decoder will
2956 * generally do stupid things, whereas setting it to unofficial or lower
2957 * will mean the encoder might produce output that is not supported by all
2958 * spec-compliant decoders. Decoders don't differentiate between normal,
2959 * unofficial and experimental (that is, they always try to decode things
2960 * when they can) unless they are explicitly asked to behave stupidly
2961 * (=strictly conform to the specs)
2963 int strict_std_compliance;
2964 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2965 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2966 #define FF_COMPLIANCE_NORMAL 0
2967 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2968 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2971 * error concealment flags
2972 * - encoding: unused
2973 * - decoding: Set by user.
2975 int error_concealment;
2976 #define FF_EC_GUESS_MVS 1
2977 #define FF_EC_DEBLOCK 2
2978 #define FF_EC_FAVOR_INTER 256
2982 * - encoding: Set by user.
2983 * - decoding: Set by user.
2986 #define FF_DEBUG_PICT_INFO 1
2987 #define FF_DEBUG_RC 2
2988 #define FF_DEBUG_BITSTREAM 4
2989 #define FF_DEBUG_MB_TYPE 8
2990 #define FF_DEBUG_QP 16
2993 * @deprecated this option does nothing
2995 #define FF_DEBUG_MV 32
2997 #define FF_DEBUG_DCT_COEFF 0x00000040
2998 #define FF_DEBUG_SKIP 0x00000080
2999 #define FF_DEBUG_STARTCODE 0x00000100
3000 #if FF_API_UNUSED_MEMBERS
3001 #define FF_DEBUG_PTS 0x00000200
3002 #endif /* FF_API_UNUSED_MEMBERS */
3003 #define FF_DEBUG_ER 0x00000400
3004 #define FF_DEBUG_MMCO 0x00000800
3005 #define FF_DEBUG_BUGS 0x00001000
3007 #define FF_DEBUG_VIS_QP 0x00002000
3008 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
3010 #define FF_DEBUG_BUFFERS 0x00008000
3011 #define FF_DEBUG_THREADS 0x00010000
3012 #define FF_DEBUG_GREEN_MD 0x00800000
3013 #define FF_DEBUG_NOMC 0x01000000
3018 * - encoding: Set by user.
3019 * - decoding: Set by user.
3022 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
3023 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
3024 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
3028 * Error recognition; may misdetect some more or less valid parts as errors.
3029 * - encoding: unused
3030 * - decoding: Set by user.
3032 int err_recognition;
3035 * Verify checksums embedded in the bitstream (could be of either encoded or
3036 * decoded data, depending on the codec) and print an error message on mismatch.
3037 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
3038 * decoder returning an error.
3040 #define AV_EF_CRCCHECK (1<<0)
3041 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
3042 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
3043 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
3045 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
3046 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
3047 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
3048 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
3052 * opaque 64-bit number (generally a PTS) that will be reordered and
3053 * output in AVFrame.reordered_opaque
3054 * - encoding: unused
3055 * - decoding: Set by user.
3057 int64_t reordered_opaque;
3060 * Hardware accelerator in use
3061 * - encoding: unused.
3062 * - decoding: Set by libavcodec
3064 struct AVHWAccel *hwaccel;
3067 * Hardware accelerator context.
3068 * For some hardware accelerators, a global context needs to be
3069 * provided by the user. In that case, this holds display-dependent
3070 * data FFmpeg cannot instantiate itself. Please refer to the
3071 * FFmpeg HW accelerator documentation to know how to fill this
3072 * is. e.g. for VA API, this is a struct vaapi_context.
3073 * - encoding: unused
3074 * - decoding: Set by user
3076 void *hwaccel_context;
3080 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
3081 * - decoding: unused
3083 uint64_t error[AV_NUM_DATA_POINTERS];
3086 * DCT algorithm, see FF_DCT_* below
3087 * - encoding: Set by user.
3088 * - decoding: unused
3091 #define FF_DCT_AUTO 0
3092 #define FF_DCT_FASTINT 1
3093 #define FF_DCT_INT 2
3094 #define FF_DCT_MMX 3
3095 #define FF_DCT_ALTIVEC 5
3096 #define FF_DCT_FAAN 6
3099 * IDCT algorithm, see FF_IDCT_* below.
3100 * - encoding: Set by user.
3101 * - decoding: Set by user.
3104 #define FF_IDCT_AUTO 0
3105 #define FF_IDCT_INT 1
3106 #define FF_IDCT_SIMPLE 2
3107 #define FF_IDCT_SIMPLEMMX 3
3108 #define FF_IDCT_ARM 7
3109 #define FF_IDCT_ALTIVEC 8
3111 #define FF_IDCT_SH4 9
3113 #define FF_IDCT_SIMPLEARM 10
3114 #if FF_API_UNUSED_MEMBERS
3115 #define FF_IDCT_IPP 13
3116 #endif /* FF_API_UNUSED_MEMBERS */
3117 #define FF_IDCT_XVID 14
3118 #if FF_API_IDCT_XVIDMMX
3119 #define FF_IDCT_XVIDMMX 14
3120 #endif /* FF_API_IDCT_XVIDMMX */
3121 #define FF_IDCT_SIMPLEARMV5TE 16
3122 #define FF_IDCT_SIMPLEARMV6 17
3123 #if FF_API_ARCH_SPARC
3124 #define FF_IDCT_SIMPLEVIS 18
3126 #define FF_IDCT_FAAN 20
3127 #define FF_IDCT_SIMPLENEON 22
3128 #if FF_API_ARCH_ALPHA
3129 #define FF_IDCT_SIMPLEALPHA 23
3131 #define FF_IDCT_SIMPLEAUTO 128
3134 * bits per sample/pixel from the demuxer (needed for huffyuv).
3135 * - encoding: Set by libavcodec.
3136 * - decoding: Set by user.
3138 int bits_per_coded_sample;
3141 * Bits per sample/pixel of internal libavcodec pixel/sample format.
3142 * - encoding: set by user.
3143 * - decoding: set by libavcodec.
3145 int bits_per_raw_sample;
3149 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3150 * - encoding: unused
3151 * - decoding: Set by user.
3156 #if FF_API_CODED_FRAME
3158 * the picture in the bitstream
3159 * - encoding: Set by libavcodec.
3160 * - decoding: unused
3162 * @deprecated use the quality factor packet side data instead
3164 attribute_deprecated AVFrame *coded_frame;
3169 * is used to decide how many independent tasks should be passed to execute()
3170 * - encoding: Set by user.
3171 * - decoding: Set by user.
3176 * Which multithreading methods to use.
3177 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3178 * so clients which cannot provide future frames should not use it.
3180 * - encoding: Set by user, otherwise the default is used.
3181 * - decoding: Set by user, otherwise the default is used.
3184 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3185 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3188 * Which multithreading methods are in use by the codec.
3189 * - encoding: Set by libavcodec.
3190 * - decoding: Set by libavcodec.
3192 int active_thread_type;
3195 * Set by the client if its custom get_buffer() callback can be called
3196 * synchronously from another thread, which allows faster multithreaded decoding.
3197 * draw_horiz_band() will be called from other threads regardless of this setting.
3198 * Ignored if the default get_buffer() is used.
3199 * - encoding: Set by user.
3200 * - decoding: Set by user.
3202 int thread_safe_callbacks;
3205 * The codec may call this to execute several independent things.
3206 * It will return only after finishing all tasks.
3207 * The user may replace this with some multithreaded implementation,
3208 * the default implementation will execute the parts serially.
3209 * @param count the number of things to execute
3210 * - encoding: Set by libavcodec, user can override.
3211 * - decoding: Set by libavcodec, user can override.
3213 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3216 * The codec may call this to execute several independent things.
3217 * It will return only after finishing all tasks.
3218 * The user may replace this with some multithreaded implementation,
3219 * the default implementation will execute the parts serially.
3220 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3221 * @param c context passed also to func
3222 * @param count the number of things to execute
3223 * @param arg2 argument passed unchanged to func
3224 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3225 * @param func function that will be called count times, with jobnr from 0 to count-1.
3226 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3227 * two instances of func executing at the same time will have the same threadnr.
3228 * @return always 0 currently, but code should handle a future improvement where when any call to func
3229 * returns < 0 no further calls to func may be done and < 0 is returned.
3230 * - encoding: Set by libavcodec, user can override.
3231 * - decoding: Set by libavcodec, user can override.
3233 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3236 * noise vs. sse weight for the nsse comparison function
3237 * - encoding: Set by user.
3238 * - decoding: unused
3244 * - encoding: Set by user.
3245 * - decoding: Set by libavcodec.
3248 #define FF_PROFILE_UNKNOWN -99
3249 #define FF_PROFILE_RESERVED -100
3251 #define FF_PROFILE_AAC_MAIN 0
3252 #define FF_PROFILE_AAC_LOW 1
3253 #define FF_PROFILE_AAC_SSR 2
3254 #define FF_PROFILE_AAC_LTP 3
3255 #define FF_PROFILE_AAC_HE 4
3256 #define FF_PROFILE_AAC_HE_V2 28
3257 #define FF_PROFILE_AAC_LD 22
3258 #define FF_PROFILE_AAC_ELD 38
3259 #define FF_PROFILE_MPEG2_AAC_LOW 128
3260 #define FF_PROFILE_MPEG2_AAC_HE 131
3262 #define FF_PROFILE_DNXHD 0
3263 #define FF_PROFILE_DNXHR_LB 1
3264 #define FF_PROFILE_DNXHR_SQ 2
3265 #define FF_PROFILE_DNXHR_HQ 3
3266 #define FF_PROFILE_DNXHR_HQX 4
3267 #define FF_PROFILE_DNXHR_444 5
3269 #define FF_PROFILE_DTS 20
3270 #define FF_PROFILE_DTS_ES 30
3271 #define FF_PROFILE_DTS_96_24 40
3272 #define FF_PROFILE_DTS_HD_HRA 50
3273 #define FF_PROFILE_DTS_HD_MA 60
3274 #define FF_PROFILE_DTS_EXPRESS 70
3276 #define FF_PROFILE_MPEG2_422 0
3277 #define FF_PROFILE_MPEG2_HIGH 1
3278 #define FF_PROFILE_MPEG2_SS 2
3279 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3280 #define FF_PROFILE_MPEG2_MAIN 4
3281 #define FF_PROFILE_MPEG2_SIMPLE 5
3283 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3284 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3286 #define FF_PROFILE_H264_BASELINE 66
3287 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3288 #define FF_PROFILE_H264_MAIN 77
3289 #define FF_PROFILE_H264_EXTENDED 88
3290 #define FF_PROFILE_H264_HIGH 100
3291 #define FF_PROFILE_H264_HIGH_10 110
3292 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3293 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
3294 #define FF_PROFILE_H264_HIGH_422 122
3295 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3296 #define FF_PROFILE_H264_STEREO_HIGH 128
3297 #define FF_PROFILE_H264_HIGH_444 144
3298 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3299 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3300 #define FF_PROFILE_H264_CAVLC_444 44
3302 #define FF_PROFILE_VC1_SIMPLE 0
3303 #define FF_PROFILE_VC1_MAIN 1
3304 #define FF_PROFILE_VC1_COMPLEX 2
3305 #define FF_PROFILE_VC1_ADVANCED 3
3307 #define FF_PROFILE_MPEG4_SIMPLE 0
3308 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3309 #define FF_PROFILE_MPEG4_CORE 2
3310 #define FF_PROFILE_MPEG4_MAIN 3
3311 #define FF_PROFILE_MPEG4_N_BIT 4
3312 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3313 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3314 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3315 #define FF_PROFILE_MPEG4_HYBRID 8
3316 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3317 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3318 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3319 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3320 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3321 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3322 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3324 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
3325 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
3326 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
3327 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3328 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3330 #define FF_PROFILE_VP9_0 0
3331 #define FF_PROFILE_VP9_1 1
3332 #define FF_PROFILE_VP9_2 2
3333 #define FF_PROFILE_VP9_3 3
3335 #define FF_PROFILE_HEVC_MAIN 1
3336 #define FF_PROFILE_HEVC_MAIN_10 2
3337 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3338 #define FF_PROFILE_HEVC_REXT 4
3342 * - encoding: Set by user.
3343 * - decoding: Set by libavcodec.
3346 #define FF_LEVEL_UNKNOWN -99
3349 * Skip loop filtering for selected frames.
3350 * - encoding: unused
3351 * - decoding: Set by user.
3353 enum AVDiscard skip_loop_filter;
3356 * Skip IDCT/dequantization for selected frames.
3357 * - encoding: unused
3358 * - decoding: Set by user.
3360 enum AVDiscard skip_idct;
3363 * Skip decoding for selected frames.
3364 * - encoding: unused
3365 * - decoding: Set by user.
3367 enum AVDiscard skip_frame;
3370 * Header containing style information for text subtitles.
3371 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3372 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3373 * the Format line following. It shouldn't include any Dialogue line.
3374 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3375 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3377 uint8_t *subtitle_header;
3378 int subtitle_header_size;
3380 #if FF_API_ERROR_RATE
3382 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3385 attribute_deprecated
3389 #if FF_API_VBV_DELAY
3391 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3392 * Used for compliant TS muxing.
3393 * - encoding: Set by libavcodec.
3394 * - decoding: unused.
3395 * @deprecated this value is now exported as a part of
3396 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3398 attribute_deprecated
3402 #if FF_API_SIDEDATA_ONLY_PKT
3404 * Encoding only and set by default. Allow encoders to output packets
3405 * that do not contain any encoded data, only side data.
3407 * Some encoders need to output such packets, e.g. to update some stream
3408 * parameters at the end of encoding.
3410 * @deprecated this field disables the default behaviour and
3411 * it is kept only for compatibility.
3413 attribute_deprecated
3414 int side_data_only_packets;
3418 * Audio only. The number of "priming" samples (padding) inserted by the
3419 * encoder at the beginning of the audio. I.e. this number of leading
3420 * decoded samples must be discarded by the caller to get the original audio
3421 * without leading padding.
3423 * - decoding: unused
3424 * - encoding: Set by libavcodec. The timestamps on the output packets are
3425 * adjusted by the encoder so that they always refer to the
3426 * first sample of the data actually contained in the packet,
3427 * including any added padding. E.g. if the timebase is
3428 * 1/samplerate and the timestamp of the first input sample is
3429 * 0, the timestamp of the first output packet will be
3432 int initial_padding;
3435 * - decoding: For codecs that store a framerate value in the compressed
3436 * bitstream, the decoder may export it here. { 0, 1} when
3438 * - encoding: May be used to signal the framerate of CFR content to an
3441 AVRational framerate;
3444 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3445 * - encoding: unused.
3446 * - decoding: Set by libavcodec before calling get_format()
3448 enum AVPixelFormat sw_pix_fmt;
3451 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3452 * - encoding unused.
3453 * - decoding set by user.
3455 AVRational pkt_timebase;
3459 * - encoding: unused.
3460 * - decoding: set by libavcodec.
3462 const AVCodecDescriptor *codec_descriptor;
3466 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3467 * - encoding: unused
3468 * - decoding: Set by user.
3474 * Current statistics for PTS correction.
3475 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3476 * - encoding: unused
3478 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3479 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3480 int64_t pts_correction_last_pts; /// PTS of the last frame
3481 int64_t pts_correction_last_dts; /// DTS of the last frame
3484 * Character encoding of the input subtitles file.
3485 * - decoding: set by user
3486 * - encoding: unused
3491 * Subtitles character encoding mode. Formats or codecs might be adjusting
3492 * this setting (if they are doing the conversion themselves for instance).
3493 * - decoding: set by libavcodec
3494 * - encoding: unused
3496 int sub_charenc_mode;
3497 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
3498 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3499 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
3502 * Skip processing alpha if supported by codec.
3503 * Note that if the format uses pre-multiplied alpha (common with VP6,
3504 * and recommended due to better video quality/compression)
3505 * the image will look as if alpha-blended onto a black background.
3506 * However for formats that do not use pre-multiplied alpha
3507 * there might be serious artefacts (though e.g. libswscale currently
3508 * assumes pre-multiplied alpha anyway).
3510 * - decoding: set by user
3511 * - encoding: unused
3516 * Number of samples to skip after a discontinuity
3517 * - decoding: unused
3518 * - encoding: set by libavcodec
3522 #if !FF_API_DEBUG_MV
3524 * debug motion vectors
3525 * - encoding: Set by user.
3526 * - decoding: Set by user.
3529 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3530 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3531 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3535 * custom intra quantization matrix
3536 * - encoding: Set by user, can be NULL.
3537 * - decoding: unused.
3539 uint16_t *chroma_intra_matrix;
3542 * dump format separator.
3543 * can be ", " or "\n " or anything else
3544 * - encoding: Set by user.
3545 * - decoding: Set by user.
3547 uint8_t *dump_separator;
3550 * ',' separated list of allowed decoders.
3551 * If NULL then all are allowed
3552 * - encoding: unused
3553 * - decoding: set by user
3555 char *codec_whitelist;
3558 * Properties of the stream that gets decoded
3559 * - encoding: unused
3560 * - decoding: set by libavcodec
3562 unsigned properties;
3563 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3564 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3567 * Additional data associated with the entire coded stream.
3569 * - decoding: unused
3570 * - encoding: may be set by libavcodec after avcodec_open2().
3572 AVPacketSideData *coded_side_data;
3573 int nb_coded_side_data;
3576 * A reference to the AVHWFramesContext describing the input (for encoding)
3577 * or output (decoding) frames. The reference is set by the caller and
3578 * afterwards owned (and freed) by libavcodec - it should never be read by
3579 * the caller after being set.
3581 * - decoding: This field should be set by the caller from the get_format()
3582 * callback. The previous reference (if any) will always be
3583 * unreffed by libavcodec before the get_format() call.
3585 * If the default get_buffer2() is used with a hwaccel pixel
3586 * format, then this AVHWFramesContext will be used for
3587 * allocating the frame buffers.
3589 * - encoding: For hardware encoders configured to use a hwaccel pixel
3590 * format, this field should be set by the caller to a reference
3591 * to the AVHWFramesContext describing input frames.
3592 * AVHWFramesContext.format must be equal to
3593 * AVCodecContext.pix_fmt.
3595 * This field should be set before avcodec_open2() is called.
3597 AVBufferRef *hw_frames_ctx;
3600 * Control the form of AVSubtitle.rects[N]->ass
3601 * - decoding: set by user
3602 * - encoding: unused
3604 int sub_text_format;
3605 #define FF_SUB_TEXT_FMT_ASS 0
3606 #if FF_API_ASS_TIMING
3607 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3611 * Audio only. The amount of padding (in samples) appended by the encoder to
3612 * the end of the audio. I.e. this number of decoded samples must be
3613 * discarded by the caller from the end of the stream to get the original
3614 * audio without any trailing padding.
3616 * - decoding: unused
3617 * - encoding: unused
3619 int trailing_padding;
3622 * The number of pixels per image to maximally accept.
3624 * - decoding: set by user
3625 * - encoding: set by user
3630 * A reference to the AVHWDeviceContext describing the device which will
3631 * be used by a hardware encoder/decoder. The reference is set by the
3632 * caller and afterwards owned (and freed) by libavcodec.
3634 * This should be used if either the codec device does not require
3635 * hardware frames or any that are used are to be allocated internally by
3636 * libavcodec. If the user wishes to supply any of the frames used as
3637 * encoder input or decoder output then hw_frames_ctx should be used
3638 * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3639 * field will be ignored while decoding the associated stream segment, but
3640 * may again be used on a following one after another get_format() call.
3642 * For both encoders and decoders this field should be set before
3643 * avcodec_open2() is called and must not be written to thereafter.
3645 * Note that some decoders may require this field to be set initially in
3646 * order to support hw_frames_ctx at all - in that case, all frames
3647 * contexts used must be created on the same device.
3649 AVBufferRef *hw_device_ctx;
3652 * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3653 * decoding (if active).
3654 * - encoding: unused
3655 * - decoding: Set by user (either before avcodec_open2(), or in the
3656 * AVCodecContext.get_format callback)
3661 * Video decoding only. Certain video codecs support cropping, meaning that
3662 * only a sub-rectangle of the decoded frame is intended for display. This
3663 * option controls how cropping is handled by libavcodec.
3665 * When set to 1 (the default), libavcodec will apply cropping internally.
3666 * I.e. it will modify the output frame width/height fields and offset the
3667 * data pointers (only by as much as possible while preserving alignment, or
3668 * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3669 * the frames output by the decoder refer only to the cropped area. The
3670 * crop_* fields of the output frames will be zero.
3672 * When set to 0, the width/height fields of the output frames will be set
3673 * to the coded dimensions and the crop_* fields will describe the cropping
3674 * rectangle. Applying the cropping is left to the caller.
3676 * @warning When hardware acceleration with opaque output frames is used,
3677 * libavcodec is unable to apply cropping from the top/left border.
3679 * @note when this option is set to zero, the width/height fields of the
3680 * AVCodecContext and output AVFrames have different meanings. The codec
3681 * context fields store display dimensions (with the coded dimensions in
3682 * coded_width/height), while the frame fields store the coded dimensions
3683 * (with the display dimensions being determined by the crop_* fields).
3688 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3689 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3691 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3692 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3694 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3696 int av_codec_get_lowres(const AVCodecContext *avctx);
3697 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3699 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3700 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3702 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3703 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3708 typedef struct AVProfile {
3710 const char *name; ///< short name for the profile
3713 typedef struct AVCodecDefault AVCodecDefault;
3720 typedef struct AVCodec {
3722 * Name of the codec implementation.
3723 * The name is globally unique among encoders and among decoders (but an
3724 * encoder and a decoder can share the same name).
3725 * This is the primary way to find a codec from the user perspective.
3729 * Descriptive name for the codec, meant to be more human readable than name.
3730 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3732 const char *long_name;
3733 enum AVMediaType type;
3736 * Codec capabilities.
3737 * see AV_CODEC_CAP_*
3740 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3741 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3742 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3743 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3744 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3745 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3746 const AVClass *priv_class; ///< AVClass for the private context
3747 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3749 /*****************************************************************
3750 * No fields below this line are part of the public API. They
3751 * may not be used outside of libavcodec and can be changed and
3753 * New public fields should be added right above.
3754 *****************************************************************
3757 struct AVCodec *next;
3759 * @name Frame-level threading support functions
3763 * If defined, called on thread contexts when they are created.
3764 * If the codec allocates writable tables in init(), re-allocate them here.
3765 * priv_data will be set to a copy of the original.
3767 int (*init_thread_copy)(AVCodecContext *);
3769 * Copy necessary context variables from a previous thread context to the current one.
3770 * If not defined, the next thread will start automatically; otherwise, the codec
3771 * must call ff_thread_finish_setup().
3773 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3775 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3779 * Private codec-specific defaults.
3781 const AVCodecDefault *defaults;
3784 * Initialize codec static data, called from avcodec_register().
3786 void (*init_static_data)(struct AVCodec *codec);
3788 int (*init)(AVCodecContext *);
3789 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3790 const struct AVSubtitle *sub);
3792 * Encode data to an AVPacket.
3794 * @param avctx codec context
3795 * @param avpkt output AVPacket (may contain a user-provided buffer)
3796 * @param[in] frame AVFrame containing the raw data to be encoded
3797 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3798 * non-empty packet was returned in avpkt.
3799 * @return 0 on success, negative error code on failure
3801 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3802 int *got_packet_ptr);
3803 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3804 int (*close)(AVCodecContext *);
3806 * Encode API with decoupled packet/frame dataflow. The API is the
3807 * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3809 * - never called if the codec is closed or the wrong type,
3810 * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3811 * - only one drain frame is ever passed down,
3813 int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
3814 int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
3817 * Decode API with decoupled packet/frame dataflow. This function is called
3818 * to get one output frame. It should call ff_decode_get_packet() to obtain
3821 int (*receive_frame)(AVCodecContext *avctx, AVFrame *frame);
3824 * Will be called when seeking
3826 void (*flush)(AVCodecContext *);
3828 * Internal codec capabilities.
3829 * See FF_CODEC_CAP_* in internal.h
3834 * Decoding only, a comma-separated list of bitstream filters to apply to
3835 * packets before decoding.
3840 int av_codec_get_max_lowres(const AVCodec *codec);
3842 struct MpegEncContext;
3845 * @defgroup lavc_hwaccel AVHWAccel
3848 typedef struct AVHWAccel {
3850 * Name of the hardware accelerated codec.
3851 * The name is globally unique among encoders and among decoders (but an
3852 * encoder and a decoder can share the same name).
3857 * Type of codec implemented by the hardware accelerator.
3859 * See AVMEDIA_TYPE_xxx
3861 enum AVMediaType type;
3864 * Codec implemented by the hardware accelerator.
3866 * See AV_CODEC_ID_xxx
3871 * Supported pixel format.
3873 * Only hardware accelerated formats are supported here.
3875 enum AVPixelFormat pix_fmt;
3878 * Hardware accelerated codec capabilities.
3879 * see HWACCEL_CODEC_CAP_*
3883 /*****************************************************************
3884 * No fields below this line are part of the public API. They
3885 * may not be used outside of libavcodec and can be changed and
3887 * New public fields should be added right above.
3888 *****************************************************************
3890 struct AVHWAccel *next;
3893 * Allocate a custom buffer
3895 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3898 * Called at the beginning of each frame or field picture.
3900 * Meaningful frame information (codec specific) is guaranteed to
3901 * be parsed at this point. This function is mandatory.
3903 * Note that buf can be NULL along with buf_size set to 0.
3904 * Otherwise, this means the whole frame is available at this point.
3906 * @param avctx the codec context
3907 * @param buf the frame data buffer base
3908 * @param buf_size the size of the frame in bytes
3909 * @return zero if successful, a negative value otherwise
3911 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3914 * Callback for each slice.
3916 * Meaningful slice information (codec specific) is guaranteed to
3917 * be parsed at this point. This function is mandatory.
3918 * The only exception is XvMC, that works on MB level.
3920 * @param avctx the codec context
3921 * @param buf the slice data buffer base
3922 * @param buf_size the size of the slice in bytes
3923 * @return zero if successful, a negative value otherwise
3925 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3928 * Called at the end of each frame or field picture.
3930 * The whole picture is parsed at this point and can now be sent
3931 * to the hardware accelerator. This function is mandatory.
3933 * @param avctx the codec context
3934 * @return zero if successful, a negative value otherwise
3936 int (*end_frame)(AVCodecContext *avctx);
3939 * Size of per-frame hardware accelerator private data.
3941 * Private data is allocated with av_mallocz() before
3942 * AVCodecContext.get_buffer() and deallocated after
3943 * AVCodecContext.release_buffer().
3945 int frame_priv_data_size;
3948 * Called for every Macroblock in a slice.
3950 * XvMC uses it to replace the ff_mpv_decode_mb().
3951 * Instead of decoding to raw picture, MB parameters are
3952 * stored in an array provided by the video driver.
3954 * @param s the mpeg context
3956 void (*decode_mb)(struct MpegEncContext *s);
3959 * Initialize the hwaccel private data.
3961 * This will be called from ff_get_format(), after hwaccel and
3962 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3965 int (*init)(AVCodecContext *avctx);
3968 * Uninitialize the hwaccel private data.
3970 * This will be called from get_format() or avcodec_close(), after hwaccel
3971 * and hwaccel_context are already uninitialized.
3973 int (*uninit)(AVCodecContext *avctx);
3976 * Size of the private data to allocate in
3977 * AVCodecInternal.hwaccel_priv_data.
3982 * Internal hwaccel capabilities.
3988 * Hardware acceleration should be used for decoding even if the codec level
3989 * used is unknown or higher than the maximum supported level reported by the
3992 * It's generally a good idea to pass this flag unless you have a specific
3993 * reason not to, as hardware tends to under-report supported levels.
3995 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3998 * Hardware acceleration can output YUV pixel formats with a different chroma
3999 * sampling than 4:2:0 and/or other than 8 bits per component.
4001 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
4007 #if FF_API_AVPICTURE
4009 * @defgroup lavc_picture AVPicture
4011 * Functions for working with AVPicture
4016 * Picture data structure.
4018 * Up to four components can be stored into it, the last component is
4020 * @deprecated use AVFrame or imgutils functions instead
4022 typedef struct AVPicture {
4023 attribute_deprecated
4024 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
4025 attribute_deprecated
4026 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
4034 enum AVSubtitleType {
4037 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
4040 * Plain text, the text field must be set by the decoder and is
4041 * authoritative. ass and pict fields may contain approximations.
4046 * Formatted text, the ass field must be set by the decoder and is
4047 * authoritative. pict and text fields may contain approximations.
4052 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
4054 typedef struct AVSubtitleRect {
4055 int x; ///< top left corner of pict, undefined when pict is not set
4056 int y; ///< top left corner of pict, undefined when pict is not set
4057 int w; ///< width of pict, undefined when pict is not set
4058 int h; ///< height of pict, undefined when pict is not set
4059 int nb_colors; ///< number of colors in pict, undefined when pict is not set
4061 #if FF_API_AVPICTURE
4063 * @deprecated unused
4065 attribute_deprecated
4069 * data+linesize for the bitmap of this subtitle.
4070 * Can be set for text/ass as well once they are rendered.
4075 enum AVSubtitleType type;
4077 char *text; ///< 0 terminated plain UTF-8 text
4080 * 0 terminated ASS/SSA compatible event line.
4081 * The presentation of this is unaffected by the other values in this
4089 typedef struct AVSubtitle {
4090 uint16_t format; /* 0 = graphics */
4091 uint32_t start_display_time; /* relative to packet pts, in ms */
4092 uint32_t end_display_time; /* relative to packet pts, in ms */
4094 AVSubtitleRect **rects;
4095 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
4099 * This struct describes the properties of an encoded stream.
4101 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
4102 * be allocated with avcodec_parameters_alloc() and freed with
4103 * avcodec_parameters_free().
4105 typedef struct AVCodecParameters {
4107 * General type of the encoded data.
4109 enum AVMediaType codec_type;
4111 * Specific type of the encoded data (the codec used).
4113 enum AVCodecID codec_id;
4115 * Additional information about the codec (corresponds to the AVI FOURCC).
4120 * Extra binary data needed for initializing the decoder, codec-dependent.
4122 * Must be allocated with av_malloc() and will be freed by
4123 * avcodec_parameters_free(). The allocated size of extradata must be at
4124 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
4129 * Size of the extradata content in bytes.
4134 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
4135 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
4140 * The average bitrate of the encoded data (in bits per second).
4145 * The number of bits per sample in the codedwords.
4147 * This is basically the bitrate per sample. It is mandatory for a bunch of
4148 * formats to actually decode them. It's the number of bits for one sample in
4149 * the actual coded bitstream.
4151 * This could be for example 4 for ADPCM
4152 * For PCM formats this matches bits_per_raw_sample
4155 int bits_per_coded_sample;
4158 * This is the number of valid bits in each output sample. If the
4159 * sample format has more bits, the least significant bits are additional
4160 * padding bits, which are always 0. Use right shifts to reduce the sample
4161 * to its actual size. For example, audio formats with 24 bit samples will
4162 * have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32.
4163 * To get the original sample use "(int32_t)sample >> 8"."
4165 * For ADPCM this might be 12 or 16 or similar
4168 int bits_per_raw_sample;
4171 * Codec-specific bitstream restrictions that the stream conforms to.
4177 * Video only. The dimensions of the video frame in pixels.
4183 * Video only. The aspect ratio (width / height) which a single pixel
4184 * should have when displayed.
4186 * When the aspect ratio is unknown / undefined, the numerator should be
4187 * set to 0 (the denominator may have any value).
4189 AVRational sample_aspect_ratio;
4192 * Video only. The order of the fields in interlaced video.
4194 enum AVFieldOrder field_order;
4197 * Video only. Additional colorspace characteristics.
4199 enum AVColorRange color_range;
4200 enum AVColorPrimaries color_primaries;
4201 enum AVColorTransferCharacteristic color_trc;
4202 enum AVColorSpace color_space;
4203 enum AVChromaLocation chroma_location;
4206 * Video only. Number of delayed frames.
4211 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
4212 * unknown or unspecified, otherwise the number of bits set must be equal to
4213 * the channels field.
4215 uint64_t channel_layout;
4217 * Audio only. The number of audio channels.
4221 * Audio only. The number of audio samples per second.
4225 * Audio only. The number of bytes per coded audio frame, required by some
4228 * Corresponds to nBlockAlign in WAVEFORMATEX.
4232 * Audio only. Audio frame size, if known. Required by some formats to be static.
4237 * Audio only. The amount of padding (in samples) inserted by the encoder at
4238 * the beginning of the audio. I.e. this number of leading decoded samples
4239 * must be discarded by the caller to get the original audio without leading
4242 int initial_padding;
4244 * Audio only. The amount of padding (in samples) appended by the encoder to
4245 * the end of the audio. I.e. this number of decoded samples must be
4246 * discarded by the caller from the end of the stream to get the original
4247 * audio without any trailing padding.
4249 int trailing_padding;
4251 * Audio only. Number of samples to skip after a discontinuity.
4254 } AVCodecParameters;
4257 * If c is NULL, returns the first registered codec,
4258 * if c is non-NULL, returns the next registered codec after c,
4259 * or NULL if c is the last one.
4261 AVCodec *av_codec_next(const AVCodec *c);
4264 * Return the LIBAVCODEC_VERSION_INT constant.
4266 unsigned avcodec_version(void);
4269 * Return the libavcodec build-time configuration.
4271 const char *avcodec_configuration(void);
4274 * Return the libavcodec license.
4276 const char *avcodec_license(void);
4279 * Register the codec codec and initialize libavcodec.
4281 * @warning either this function or avcodec_register_all() must be called
4282 * before any other libavcodec functions.
4284 * @see avcodec_register_all()
4286 void avcodec_register(AVCodec *codec);
4289 * Register all the codecs, parsers and bitstream filters which were enabled at
4290 * configuration time. If you do not call this function you can select exactly
4291 * which formats you want to support, by using the individual registration
4294 * @see avcodec_register
4295 * @see av_register_codec_parser
4296 * @see av_register_bitstream_filter
4298 void avcodec_register_all(void);
4301 * Allocate an AVCodecContext and set its fields to default values. The
4302 * resulting struct should be freed with avcodec_free_context().
4304 * @param codec if non-NULL, allocate private data and initialize defaults
4305 * for the given codec. It is illegal to then call avcodec_open2()
4306 * with a different codec.
4307 * If NULL, then the codec-specific defaults won't be initialized,
4308 * which may result in suboptimal default settings (this is
4309 * important mainly for encoders, e.g. libx264).
4311 * @return An AVCodecContext filled with default values or NULL on failure.
4313 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
4316 * Free the codec context and everything associated with it and write NULL to
4317 * the provided pointer.
4319 void avcodec_free_context(AVCodecContext **avctx);
4321 #if FF_API_GET_CONTEXT_DEFAULTS
4323 * @deprecated This function should not be used, as closing and opening a codec
4324 * context multiple time is not supported. A new codec context should be
4325 * allocated for each new use.
4327 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
4331 * Get the AVClass for AVCodecContext. It can be used in combination with
4332 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4334 * @see av_opt_find().
4336 const AVClass *avcodec_get_class(void);
4338 #if FF_API_COPY_CONTEXT
4340 * Get the AVClass for AVFrame. It can be used in combination with
4341 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4343 * @see av_opt_find().
4345 const AVClass *avcodec_get_frame_class(void);
4348 * Get the AVClass for AVSubtitleRect. It can be used in combination with
4349 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4351 * @see av_opt_find().
4353 const AVClass *avcodec_get_subtitle_rect_class(void);
4356 * Copy the settings of the source AVCodecContext into the destination
4357 * AVCodecContext. The resulting destination codec context will be
4358 * unopened, i.e. you are required to call avcodec_open2() before you
4359 * can use this AVCodecContext to decode/encode video/audio data.
4361 * @param dest target codec context, should be initialized with
4362 * avcodec_alloc_context3(NULL), but otherwise uninitialized
4363 * @param src source codec context
4364 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4366 * @deprecated The semantics of this function are ill-defined and it should not
4367 * be used. If you need to transfer the stream parameters from one codec context
4368 * to another, use an intermediate AVCodecParameters instance and the
4369 * avcodec_parameters_from_context() / avcodec_parameters_to_context()
4372 attribute_deprecated
4373 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
4377 * Allocate a new AVCodecParameters and set its fields to default values
4378 * (unknown/invalid/0). The returned struct must be freed with
4379 * avcodec_parameters_free().
4381 AVCodecParameters *avcodec_parameters_alloc(void);
4384 * Free an AVCodecParameters instance and everything associated with it and
4385 * write NULL to the supplied pointer.
4387 void avcodec_parameters_free(AVCodecParameters **par);
4390 * Copy the contents of src to dst. Any allocated fields in dst are freed and
4391 * replaced with newly allocated duplicates of the corresponding fields in src.
4393 * @return >= 0 on success, a negative AVERROR code on failure.
4395 int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
4398 * Fill the parameters struct based on the values from the supplied codec
4399 * context. Any allocated fields in par are freed and replaced with duplicates
4400 * of the corresponding fields in codec.
4402 * @return >= 0 on success, a negative AVERROR code on failure
4404 int avcodec_parameters_from_context(AVCodecParameters *par,
4405 const AVCodecContext *codec);
4408 * Fill the codec context based on the values from the supplied codec
4409 * parameters. Any allocated fields in codec that have a corresponding field in
4410 * par are freed and replaced with duplicates of the corresponding field in par.
4411 * Fields in codec that do not have a counterpart in par are not touched.
4413 * @return >= 0 on success, a negative AVERROR code on failure.
4415 int avcodec_parameters_to_context(AVCodecContext *codec,
4416 const AVCodecParameters *par);
4419 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4420 * function the context has to be allocated with avcodec_alloc_context3().
4422 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4423 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4424 * retrieving a codec.
4426 * @warning This function is not thread safe!
4428 * @note Always call this function before using decoding routines (such as
4429 * @ref avcodec_receive_frame()).
4432 * avcodec_register_all();
4433 * av_dict_set(&opts, "b", "2.5M", 0);
4434 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
4438 * context = avcodec_alloc_context3(codec);
4440 * if (avcodec_open2(context, codec, opts) < 0)
4444 * @param avctx The context to initialize.
4445 * @param codec The codec to open this context for. If a non-NULL codec has been
4446 * previously passed to avcodec_alloc_context3() or
4447 * for this context, then this parameter MUST be either NULL or
4448 * equal to the previously passed codec.
4449 * @param options A dictionary filled with AVCodecContext and codec-private options.
4450 * On return this object will be filled with options that were not found.
4452 * @return zero on success, a negative value on error
4453 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4454 * av_dict_set(), av_opt_find().
4456 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4459 * Close a given AVCodecContext and free all the data associated with it
4460 * (but not the AVCodecContext itself).
4462 * Calling this function on an AVCodecContext that hasn't been opened will free
4463 * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
4464 * codec. Subsequent calls will do nothing.
4466 * @note Do not use this function. Use avcodec_free_context() to destroy a
4467 * codec context (either open or closed). Opening and closing a codec context
4468 * multiple times is not supported anymore -- use multiple codec contexts
4471 int avcodec_close(AVCodecContext *avctx);
4474 * Free all allocated data in the given subtitle struct.
4476 * @param sub AVSubtitle to free.
4478 void avsubtitle_free(AVSubtitle *sub);
4485 * @addtogroup lavc_packet
4490 * Allocate an AVPacket and set its fields to default values. The resulting
4491 * struct must be freed using av_packet_free().
4493 * @return An AVPacket filled with default values or NULL on failure.
4495 * @note this only allocates the AVPacket itself, not the data buffers. Those
4496 * must be allocated through other means such as av_new_packet.
4498 * @see av_new_packet
4500 AVPacket *av_packet_alloc(void);
4503 * Create a new packet that references the same data as src.
4505 * This is a shortcut for av_packet_alloc()+av_packet_ref().
4507 * @return newly created AVPacket on success, NULL on error.
4509 * @see av_packet_alloc
4510 * @see av_packet_ref
4512 AVPacket *av_packet_clone(const AVPacket *src);
4515 * Free the packet, if the packet is reference counted, it will be
4516 * unreferenced first.
4518 * @param pkt packet to be freed. The pointer will be set to NULL.
4519 * @note passing NULL is a no-op.
4521 void av_packet_free(AVPacket **pkt);
4524 * Initialize optional fields of a packet with default values.
4526 * Note, this does not touch the data and size members, which have to be
4527 * initialized separately.
4531 void av_init_packet(AVPacket *pkt);
4534 * Allocate the payload of a packet and initialize its fields with
4538 * @param size wanted payload size
4539 * @return 0 if OK, AVERROR_xxx otherwise
4541 int av_new_packet(AVPacket *pkt, int size);
4544 * Reduce packet size, correctly zeroing padding
4547 * @param size new size
4549 void av_shrink_packet(AVPacket *pkt, int size);
4552 * Increase packet size, correctly zeroing padding
4555 * @param grow_by number of bytes by which to increase the size of the packet
4557 int av_grow_packet(AVPacket *pkt, int grow_by);
4560 * Initialize a reference-counted packet from av_malloc()ed data.
4562 * @param pkt packet to be initialized. This function will set the data, size,
4563 * buf and destruct fields, all others are left untouched.
4564 * @param data Data allocated by av_malloc() to be used as packet data. If this
4565 * function returns successfully, the data is owned by the underlying AVBuffer.
4566 * The caller may not access the data through other means.
4567 * @param size size of data in bytes, without the padding. I.e. the full buffer
4568 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4570 * @return 0 on success, a negative AVERROR on error
4572 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4574 #if FF_API_AVPACKET_OLD_API
4576 * @warning This is a hack - the packet memory allocation stuff is broken. The
4577 * packet is allocated if it was not really allocated.
4579 * @deprecated Use av_packet_ref
4581 attribute_deprecated
4582 int av_dup_packet(AVPacket *pkt);
4584 * Copy packet, including contents
4586 * @return 0 on success, negative AVERROR on fail
4588 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4591 * Copy packet side data
4593 * @return 0 on success, negative AVERROR on fail
4595 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4600 * @deprecated Use av_packet_unref
4602 * @param pkt packet to free
4604 attribute_deprecated
4605 void av_free_packet(AVPacket *pkt);
4608 * Allocate new information of a packet.
4611 * @param type side information type
4612 * @param size side information size
4613 * @return pointer to fresh allocated data or NULL otherwise
4615 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4619 * Wrap an existing array as a packet side data.
4622 * @param type side information type
4623 * @param data the side data array. It must be allocated with the av_malloc()
4624 * family of functions. The ownership of the data is transferred to
4626 * @param size side information size
4627 * @return a non-negative number on success, a negative AVERROR code on
4628 * failure. On failure, the packet is unchanged and the data remains
4629 * owned by the caller.
4631 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4632 uint8_t *data, size_t size);
4635 * Shrink the already allocated side data buffer
4638 * @param type side information type
4639 * @param size new side information size
4640 * @return 0 on success, < 0 on failure
4642 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4646 * Get side information from packet.
4649 * @param type desired side information type
4650 * @param size pointer for side information size to store (optional)
4651 * @return pointer to data if present or NULL otherwise
4653 uint8_t* av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type,
4656 #if FF_API_MERGE_SD_API
4657 attribute_deprecated
4658 int av_packet_merge_side_data(AVPacket *pkt);
4660 attribute_deprecated
4661 int av_packet_split_side_data(AVPacket *pkt);
4664 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4667 * Pack a dictionary for use in side_data.
4669 * @param dict The dictionary to pack.
4670 * @param size pointer to store the size of the returned data
4671 * @return pointer to data if successful, NULL otherwise
4673 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4675 * Unpack a dictionary from side_data.
4677 * @param data data from side_data
4678 * @param size size of the data
4679 * @param dict the metadata storage dictionary
4680 * @return 0 on success, < 0 on failure
4682 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4686 * Convenience function to free all the side data stored.
4687 * All the other fields stay untouched.
4691 void av_packet_free_side_data(AVPacket *pkt);
4694 * Setup a new reference to the data described by a given packet
4696 * If src is reference-counted, setup dst as a new reference to the
4697 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4698 * data from src into it.
4700 * All the other fields are copied from src.
4702 * @see av_packet_unref
4704 * @param dst Destination packet
4705 * @param src Source packet
4707 * @return 0 on success, a negative AVERROR on error.
4709 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4714 * Unreference the buffer referenced by the packet and reset the
4715 * remaining packet fields to their default values.
4717 * @param pkt The packet to be unreferenced.
4719 void av_packet_unref(AVPacket *pkt);
4722 * Move every field in src to dst and reset src.
4724 * @see av_packet_unref
4726 * @param src Source packet, will be reset
4727 * @param dst Destination packet
4729 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4732 * Copy only "properties" fields from src to dst.
4734 * Properties for the purpose of this function are all the fields
4735 * beside those related to the packet data (buf, data, size)
4737 * @param dst Destination packet
4738 * @param src Source packet
4740 * @return 0 on success AVERROR on failure.
4742 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4745 * Convert valid timing fields (timestamps / durations) in a packet from one
4746 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4749 * @param pkt packet on which the conversion will be performed
4750 * @param tb_src source timebase, in which the timing fields in pkt are
4752 * @param tb_dst destination timebase, to which the timing fields will be
4755 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4762 * @addtogroup lavc_decoding
4767 * Find a registered decoder with a matching codec ID.
4769 * @param id AVCodecID of the requested decoder
4770 * @return A decoder if one was found, NULL otherwise.
4772 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4775 * Find a registered decoder with the specified name.
4777 * @param name name of the requested decoder
4778 * @return A decoder if one was found, NULL otherwise.
4780 AVCodec *avcodec_find_decoder_by_name(const char *name);
4783 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4784 * it can be called by custom get_buffer2() implementations for decoders without
4785 * AV_CODEC_CAP_DR1 set.
4787 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4791 * Return the amount of padding in pixels which the get_buffer callback must
4792 * provide around the edge of the image for codecs which do not have the
4793 * CODEC_FLAG_EMU_EDGE flag.
4795 * @return Required padding in pixels.
4797 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4800 attribute_deprecated
4801 unsigned avcodec_get_edge_width(void);
4805 * Modify width and height values so that they will result in a memory
4806 * buffer that is acceptable for the codec if you do not use any horizontal
4809 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4811 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4814 * Modify width and height values so that they will result in a memory
4815 * buffer that is acceptable for the codec if you also ensure that all
4816 * line sizes are a multiple of the respective linesize_align[i].
4818 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4820 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4821 int linesize_align[AV_NUM_DATA_POINTERS]);
4824 * Converts AVChromaLocation to swscale x/y chroma position.
4826 * The positions represent the chroma (0,0) position in a coordinates system
4827 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4829 * @param xpos horizontal chroma sample position
4830 * @param ypos vertical chroma sample position
4832 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4835 * Converts swscale x/y chroma position to AVChromaLocation.
4837 * The positions represent the chroma (0,0) position in a coordinates system
4838 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4840 * @param xpos horizontal chroma sample position
4841 * @param ypos vertical chroma sample position
4843 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4846 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4848 * Some decoders may support multiple frames in a single AVPacket. Such
4849 * decoders would then just decode the first frame and the return value would be
4850 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4851 * called again with an AVPacket containing the remaining data in order to
4852 * decode the second frame, etc... Even if no frames are returned, the packet
4853 * needs to be fed to the decoder with remaining data until it is completely
4854 * consumed or an error occurs.
4856 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4857 * and output. This means that for some packets they will not immediately
4858 * produce decoded output and need to be flushed at the end of decoding to get
4859 * all the decoded data. Flushing is done by calling this function with packets
4860 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4861 * returning samples. It is safe to flush even those decoders that are not
4862 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4864 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4865 * larger than the actual read bytes because some optimized bitstream
4866 * readers read 32 or 64 bits at once and could read over the end.
4868 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4869 * before packets may be fed to the decoder.
4871 * @param avctx the codec context
4872 * @param[out] frame The AVFrame in which to store decoded audio samples.
4873 * The decoder will allocate a buffer for the decoded frame by
4874 * calling the AVCodecContext.get_buffer2() callback.
4875 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4876 * reference counted and the returned reference belongs to the
4877 * caller. The caller must release the frame using av_frame_unref()
4878 * when the frame is no longer needed. The caller may safely write
4879 * to the frame if av_frame_is_writable() returns 1.
4880 * When AVCodecContext.refcounted_frames is set to 0, the returned
4881 * reference belongs to the decoder and is valid only until the
4882 * next call to this function or until closing or flushing the
4883 * decoder. The caller may not write to it.
4884 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4885 * non-zero. Note that this field being set to zero
4886 * does not mean that an error has occurred. For
4887 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4888 * call is guaranteed to produce a frame.
4889 * @param[in] avpkt The input AVPacket containing the input buffer.
4890 * At least avpkt->data and avpkt->size should be set. Some
4891 * decoders might also require additional fields to be set.
4892 * @return A negative error code is returned if an error occurred during
4893 * decoding, otherwise the number of bytes consumed from the input
4894 * AVPacket is returned.
4896 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4898 attribute_deprecated
4899 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4900 int *got_frame_ptr, const AVPacket *avpkt);
4903 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4904 * Some decoders may support multiple frames in a single AVPacket, such
4905 * decoders would then just decode the first frame.
4907 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4908 * the actual read bytes because some optimized bitstream readers read 32 or 64
4909 * bits at once and could read over the end.
4911 * @warning The end of the input buffer buf should be set to 0 to ensure that
4912 * no overreading happens for damaged MPEG streams.
4914 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4915 * between input and output, these need to be fed with avpkt->data=NULL,
4916 * avpkt->size=0 at the end to return the remaining frames.
4918 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4919 * before packets may be fed to the decoder.
4921 * @param avctx the codec context
4922 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4923 * Use av_frame_alloc() to get an AVFrame. The codec will
4924 * allocate memory for the actual bitmap by calling the
4925 * AVCodecContext.get_buffer2() callback.
4926 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4927 * reference counted and the returned reference belongs to the
4928 * caller. The caller must release the frame using av_frame_unref()
4929 * when the frame is no longer needed. The caller may safely write
4930 * to the frame if av_frame_is_writable() returns 1.
4931 * When AVCodecContext.refcounted_frames is set to 0, the returned
4932 * reference belongs to the decoder and is valid only until the
4933 * next call to this function or until closing or flushing the
4934 * decoder. The caller may not write to it.
4936 * @param[in] avpkt The input AVPacket containing the input buffer.
4937 * You can create such packet with av_init_packet() and by then setting
4938 * data and size, some decoders might in addition need other fields like
4939 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4941 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4942 * @return On error a negative value is returned, otherwise the number of bytes
4943 * used or zero if no frame could be decompressed.
4945 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4947 attribute_deprecated
4948 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4949 int *got_picture_ptr,
4950 const AVPacket *avpkt);
4953 * Decode a subtitle message.
4954 * Return a negative value on error, otherwise return the number of bytes used.
4955 * If no subtitle could be decompressed, got_sub_ptr is zero.
4956 * Otherwise, the subtitle is stored in *sub.
4957 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4958 * simplicity, because the performance difference is expect to be negligible
4959 * and reusing a get_buffer written for video codecs would probably perform badly
4960 * due to a potentially very different allocation pattern.
4962 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4963 * and output. This means that for some packets they will not immediately
4964 * produce decoded output and need to be flushed at the end of decoding to get
4965 * all the decoded data. Flushing is done by calling this function with packets
4966 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4967 * returning subtitles. It is safe to flush even those decoders that are not
4968 * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
4970 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4971 * before packets may be fed to the decoder.
4973 * @param avctx the codec context
4974 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4975 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4976 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4977 * @param[in] avpkt The input AVPacket containing the input buffer.
4979 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4984 * Supply raw packet data as input to a decoder.
4986 * Internally, this call will copy relevant AVCodecContext fields, which can
4987 * influence decoding per-packet, and apply them when the packet is actually
4988 * decoded. (For example AVCodecContext.skip_frame, which might direct the
4989 * decoder to drop the frame contained by the packet sent with this function.)
4991 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4992 * larger than the actual read bytes because some optimized bitstream
4993 * readers read 32 or 64 bits at once and could read over the end.
4995 * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
4996 * on the same AVCodecContext. It will return unexpected results now
4997 * or in future libavcodec versions.
4999 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
5000 * before packets may be fed to the decoder.
5002 * @param avctx codec context
5003 * @param[in] avpkt The input AVPacket. Usually, this will be a single video
5004 * frame, or several complete audio frames.
5005 * Ownership of the packet remains with the caller, and the
5006 * decoder will not write to the packet. The decoder may create
5007 * a reference to the packet data (or copy it if the packet is
5008 * not reference-counted).
5009 * Unlike with older APIs, the packet is always fully consumed,
5010 * and if it contains multiple frames (e.g. some audio codecs),
5011 * will require you to call avcodec_receive_frame() multiple
5012 * times afterwards before you can send a new packet.
5013 * It can be NULL (or an AVPacket with data set to NULL and
5014 * size set to 0); in this case, it is considered a flush
5015 * packet, which signals the end of the stream. Sending the
5016 * first flush packet will return success. Subsequent ones are
5017 * unnecessary and will return AVERROR_EOF. If the decoder
5018 * still has frames buffered, it will return them after sending
5021 * @return 0 on success, otherwise negative error code:
5022 * AVERROR(EAGAIN): input is not accepted in the current state - user
5023 * must read output with avcodec_receive_frame() (once
5024 * all output is read, the packet should be resent, and
5025 * the call will not fail with EAGAIN).
5026 * AVERROR_EOF: the decoder has been flushed, and no new packets can
5027 * be sent to it (also returned if more than 1 flush
5029 * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
5030 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5031 * other errors: legitimate decoding errors
5033 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
5036 * Return decoded output data from a decoder.
5038 * @param avctx codec context
5039 * @param frame This will be set to a reference-counted video or audio
5040 * frame (depending on the decoder type) allocated by the
5041 * decoder. Note that the function will always call
5042 * av_frame_unref(frame) before doing anything else.
5045 * 0: success, a frame was returned
5046 * AVERROR(EAGAIN): output is not available in this state - user must try
5048 * AVERROR_EOF: the decoder has been fully flushed, and there will be
5049 * no more output frames
5050 * AVERROR(EINVAL): codec not opened, or it is an encoder
5051 * other negative values: legitimate decoding errors
5053 int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
5056 * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
5057 * to retrieve buffered output packets.
5059 * @param avctx codec context
5060 * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
5061 * Ownership of the frame remains with the caller, and the
5062 * encoder will not write to the frame. The encoder may create
5063 * a reference to the frame data (or copy it if the frame is
5064 * not reference-counted).
5065 * It can be NULL, in which case it is considered a flush
5066 * packet. This signals the end of the stream. If the encoder
5067 * still has packets buffered, it will return them after this
5068 * call. Once flushing mode has been entered, additional flush
5069 * packets are ignored, and sending frames will return
5073 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5074 * can have any number of samples.
5075 * If it is not set, frame->nb_samples must be equal to
5076 * avctx->frame_size for all frames except the last.
5077 * The final frame may be smaller than avctx->frame_size.
5078 * @return 0 on success, otherwise negative error code:
5079 * AVERROR(EAGAIN): input is not accepted in the current state - user
5080 * must read output with avcodec_receive_packet() (once
5081 * all output is read, the packet should be resent, and
5082 * the call will not fail with EAGAIN).
5083 * AVERROR_EOF: the encoder has been flushed, and no new frames can
5085 * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
5086 * decoder, or requires flush
5087 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5088 * other errors: legitimate decoding errors
5090 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
5093 * Read encoded data from the encoder.
5095 * @param avctx codec context
5096 * @param avpkt This will be set to a reference-counted packet allocated by the
5097 * encoder. Note that the function will always call
5098 * av_frame_unref(frame) before doing anything else.
5099 * @return 0 on success, otherwise negative error code:
5100 * AVERROR(EAGAIN): output is not available in the current state - user
5101 * must try to send input
5102 * AVERROR_EOF: the encoder has been fully flushed, and there will be
5103 * no more output packets
5104 * AVERROR(EINVAL): codec not opened, or it is an encoder
5105 * other errors: legitimate decoding errors
5107 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
5111 * @defgroup lavc_parsing Frame parsing
5115 enum AVPictureStructure {
5116 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
5117 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
5118 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
5119 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
5122 typedef struct AVCodecParserContext {
5124 struct AVCodecParser *parser;
5125 int64_t frame_offset; /* offset of the current frame */
5126 int64_t cur_offset; /* current offset
5127 (incremented by each av_parser_parse()) */
5128 int64_t next_frame_offset; /* offset of the next frame */
5130 int pict_type; /* XXX: Put it back in AVCodecContext. */
5132 * This field is used for proper frame duration computation in lavf.
5133 * It signals, how much longer the frame duration of the current frame
5134 * is compared to normal frame duration.
5136 * frame_duration = (1 + repeat_pict) * time_base
5138 * It is used by codecs like H.264 to display telecined material.
5140 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
5141 int64_t pts; /* pts of the current frame */
5142 int64_t dts; /* dts of the current frame */
5147 int fetch_timestamp;
5149 #define AV_PARSER_PTS_NB 4
5150 int cur_frame_start_index;
5151 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
5152 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
5153 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
5156 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
5157 #define PARSER_FLAG_ONCE 0x0002
5158 /// Set if the parser has a valid file offset
5159 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
5160 #define PARSER_FLAG_USE_CODEC_TS 0x1000
5162 int64_t offset; ///< byte offset from starting packet start
5163 int64_t cur_frame_end[AV_PARSER_PTS_NB];
5166 * Set by parser to 1 for key frames and 0 for non-key frames.
5167 * It is initialized to -1, so if the parser doesn't set this flag,
5168 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
5173 #if FF_API_CONVERGENCE_DURATION
5175 * @deprecated unused
5177 attribute_deprecated
5178 int64_t convergence_duration;
5181 // Timestamp generation support:
5183 * Synchronization point for start of timestamp generation.
5185 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
5188 * For example, this corresponds to presence of H.264 buffering period
5194 * Offset of the current timestamp against last timestamp sync point in
5195 * units of AVCodecContext.time_base.
5197 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5198 * contain a valid timestamp offset.
5200 * Note that the timestamp of sync point has usually a nonzero
5201 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
5202 * the next frame after timestamp sync point will be usually 1.
5204 * For example, this corresponds to H.264 cpb_removal_delay.
5206 int dts_ref_dts_delta;
5209 * Presentation delay of current frame in units of AVCodecContext.time_base.
5211 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5212 * contain valid non-negative timestamp delta (presentation time of a frame
5213 * must not lie in the past).
5215 * This delay represents the difference between decoding and presentation
5216 * time of the frame.
5218 * For example, this corresponds to H.264 dpb_output_delay.
5223 * Position of the packet in file.
5225 * Analogous to cur_frame_pts/dts
5227 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
5230 * Byte position of currently parsed frame in stream.
5235 * Previous frame byte position.
5240 * Duration of the current frame.
5241 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
5242 * For all other types, this is in units of AVCodecContext.time_base.
5246 enum AVFieldOrder field_order;
5249 * Indicate whether a picture is coded as a frame, top field or bottom field.
5251 * For example, H.264 field_pic_flag equal to 0 corresponds to
5252 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
5253 * equal to 1 and bottom_field_flag equal to 0 corresponds to
5254 * AV_PICTURE_STRUCTURE_TOP_FIELD.
5256 enum AVPictureStructure picture_structure;
5259 * Picture number incremented in presentation or output order.
5260 * This field may be reinitialized at the first picture of a new sequence.
5262 * For example, this corresponds to H.264 PicOrderCnt.
5264 int output_picture_number;
5267 * Dimensions of the decoded video intended for presentation.
5273 * Dimensions of the coded video.
5279 * The format of the coded data, corresponds to enum AVPixelFormat for video
5280 * and for enum AVSampleFormat for audio.
5282 * Note that a decoder can have considerable freedom in how exactly it
5283 * decodes the data, so the format reported here might be different from the
5284 * one returned by a decoder.
5287 } AVCodecParserContext;
5289 typedef struct AVCodecParser {
5290 int codec_ids[5]; /* several codec IDs are permitted */
5292 int (*parser_init)(AVCodecParserContext *s);
5293 /* This callback never returns an error, a negative value means that
5294 * the frame start was in a previous packet. */
5295 int (*parser_parse)(AVCodecParserContext *s,
5296 AVCodecContext *avctx,
5297 const uint8_t **poutbuf, int *poutbuf_size,
5298 const uint8_t *buf, int buf_size);
5299 void (*parser_close)(AVCodecParserContext *s);
5300 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
5301 struct AVCodecParser *next;
5304 AVCodecParser *av_parser_next(const AVCodecParser *c);
5306 void av_register_codec_parser(AVCodecParser *parser);
5307 AVCodecParserContext *av_parser_init(int codec_id);
5312 * @param s parser context.
5313 * @param avctx codec context.
5314 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
5315 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
5316 * @param buf input buffer.
5317 * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
5318 size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
5319 To signal EOF, this should be 0 (so that the last frame
5321 * @param pts input presentation timestamp.
5322 * @param dts input decoding timestamp.
5323 * @param pos input byte position in stream.
5324 * @return the number of bytes of the input bitstream used.
5329 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
5336 * decode_frame(data, size);
5340 int av_parser_parse2(AVCodecParserContext *s,
5341 AVCodecContext *avctx,
5342 uint8_t **poutbuf, int *poutbuf_size,
5343 const uint8_t *buf, int buf_size,
5344 int64_t pts, int64_t dts,
5348 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
5349 * @deprecated use AVBitStreamFilter
5351 int av_parser_change(AVCodecParserContext *s,
5352 AVCodecContext *avctx,
5353 uint8_t **poutbuf, int *poutbuf_size,
5354 const uint8_t *buf, int buf_size, int keyframe);
5355 void av_parser_close(AVCodecParserContext *s);
5363 * @addtogroup lavc_encoding
5368 * Find a registered encoder with a matching codec ID.
5370 * @param id AVCodecID of the requested encoder
5371 * @return An encoder if one was found, NULL otherwise.
5373 AVCodec *avcodec_find_encoder(enum AVCodecID id);
5376 * Find a registered encoder with the specified name.
5378 * @param name name of the requested encoder
5379 * @return An encoder if one was found, NULL otherwise.
5381 AVCodec *avcodec_find_encoder_by_name(const char *name);
5384 * Encode a frame of audio.
5386 * Takes input samples from frame and writes the next output packet, if
5387 * available, to avpkt. The output packet does not necessarily contain data for
5388 * the most recent frame, as encoders can delay, split, and combine input frames
5389 * internally as needed.
5391 * @param avctx codec context
5392 * @param avpkt output AVPacket.
5393 * The user can supply an output buffer by setting
5394 * avpkt->data and avpkt->size prior to calling the
5395 * function, but if the size of the user-provided data is not
5396 * large enough, encoding will fail. If avpkt->data and
5397 * avpkt->size are set, avpkt->destruct must also be set. All
5398 * other AVPacket fields will be reset by the encoder using
5399 * av_init_packet(). If avpkt->data is NULL, the encoder will
5400 * allocate it. The encoder will set avpkt->size to the size
5401 * of the output packet.
5403 * If this function fails or produces no output, avpkt will be
5404 * freed using av_packet_unref().
5405 * @param[in] frame AVFrame containing the raw audio data to be encoded.
5406 * May be NULL when flushing an encoder that has the
5407 * AV_CODEC_CAP_DELAY capability set.
5408 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5409 * can have any number of samples.
5410 * If it is not set, frame->nb_samples must be equal to
5411 * avctx->frame_size for all frames except the last.
5412 * The final frame may be smaller than avctx->frame_size.
5413 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5414 * output packet is non-empty, and to 0 if it is
5415 * empty. If the function returns an error, the
5416 * packet can be assumed to be invalid, and the
5417 * value of got_packet_ptr is undefined and should
5419 * @return 0 on success, negative error code on failure
5421 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5423 attribute_deprecated
5424 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
5425 const AVFrame *frame, int *got_packet_ptr);
5428 * Encode a frame of video.
5430 * Takes input raw video data from frame and writes the next output packet, if
5431 * available, to avpkt. The output packet does not necessarily contain data for
5432 * the most recent frame, as encoders can delay and reorder input frames
5433 * internally as needed.
5435 * @param avctx codec context
5436 * @param avpkt output AVPacket.
5437 * The user can supply an output buffer by setting
5438 * avpkt->data and avpkt->size prior to calling the
5439 * function, but if the size of the user-provided data is not
5440 * large enough, encoding will fail. All other AVPacket fields
5441 * will be reset by the encoder using av_init_packet(). If
5442 * avpkt->data is NULL, the encoder will allocate it.
5443 * The encoder will set avpkt->size to the size of the
5444 * output packet. The returned data (if any) belongs to the
5445 * caller, he is responsible for freeing it.
5447 * If this function fails or produces no output, avpkt will be
5448 * freed using av_packet_unref().
5449 * @param[in] frame AVFrame containing the raw video data to be encoded.
5450 * May be NULL when flushing an encoder that has the
5451 * AV_CODEC_CAP_DELAY capability set.
5452 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5453 * output packet is non-empty, and to 0 if it is
5454 * empty. If the function returns an error, the
5455 * packet can be assumed to be invalid, and the
5456 * value of got_packet_ptr is undefined and should
5458 * @return 0 on success, negative error code on failure
5460 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5462 attribute_deprecated
5463 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
5464 const AVFrame *frame, int *got_packet_ptr);
5466 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
5467 const AVSubtitle *sub);
5474 #if FF_API_AVCODEC_RESAMPLE
5476 * @defgroup lavc_resample Audio resampling
5478 * @deprecated use libswresample instead
5482 struct ReSampleContext;
5483 struct AVResampleContext;
5485 typedef struct ReSampleContext ReSampleContext;
5488 * Initialize audio resampling context.
5490 * @param output_channels number of output channels
5491 * @param input_channels number of input channels
5492 * @param output_rate output sample rate
5493 * @param input_rate input sample rate
5494 * @param sample_fmt_out requested output sample format
5495 * @param sample_fmt_in input sample format
5496 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
5497 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
5498 * @param linear if 1 then the used FIR filter will be linearly interpolated
5499 between the 2 closest, if 0 the closest will be used
5500 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
5501 * @return allocated ReSampleContext, NULL if error occurred
5503 attribute_deprecated
5504 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
5505 int output_rate, int input_rate,
5506 enum AVSampleFormat sample_fmt_out,
5507 enum AVSampleFormat sample_fmt_in,
5508 int filter_length, int log2_phase_count,
5509 int linear, double cutoff);
5511 attribute_deprecated
5512 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
5515 * Free resample context.
5517 * @param s a non-NULL pointer to a resample context previously
5518 * created with av_audio_resample_init()
5520 attribute_deprecated
5521 void audio_resample_close(ReSampleContext *s);
5525 * Initialize an audio resampler.
5526 * Note, if either rate is not an integer then simply scale both rates up so they are.
5527 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
5528 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
5529 * @param linear If 1 then the used FIR filter will be linearly interpolated
5530 between the 2 closest, if 0 the closest will be used
5531 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
5533 attribute_deprecated
5534 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
5537 * Resample an array of samples using a previously configured context.
5538 * @param src an array of unconsumed samples
5539 * @param consumed the number of samples of src which have been consumed are returned here
5540 * @param src_size the number of unconsumed samples available
5541 * @param dst_size the amount of space in samples available in dst
5542 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
5543 * @return the number of samples written in dst or -1 if an error occurred
5545 attribute_deprecated
5546 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
5550 * Compensate samplerate/timestamp drift. The compensation is done by changing
5551 * the resampler parameters, so no audible clicks or similar distortions occur
5552 * @param compensation_distance distance in output samples over which the compensation should be performed
5553 * @param sample_delta number of output samples which should be output less
5555 * example: av_resample_compensate(c, 10, 500)
5556 * here instead of 510 samples only 500 samples would be output
5558 * note, due to rounding the actual compensation might be slightly different,
5559 * especially if the compensation_distance is large and the in_rate used during init is small
5561 attribute_deprecated
5562 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
5563 attribute_deprecated
5564 void av_resample_close(struct AVResampleContext *c);
5571 #if FF_API_AVPICTURE
5573 * @addtogroup lavc_picture
5578 * @deprecated unused
5580 attribute_deprecated
5581 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5584 * @deprecated unused
5586 attribute_deprecated
5587 void avpicture_free(AVPicture *picture);
5590 * @deprecated use av_image_fill_arrays() instead.
5592 attribute_deprecated
5593 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5594 enum AVPixelFormat pix_fmt, int width, int height);
5597 * @deprecated use av_image_copy_to_buffer() instead.
5599 attribute_deprecated
5600 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
5601 int width, int height,
5602 unsigned char *dest, int dest_size);
5605 * @deprecated use av_image_get_buffer_size() instead.
5607 attribute_deprecated
5608 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
5611 * @deprecated av_image_copy() instead.
5613 attribute_deprecated
5614 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5615 enum AVPixelFormat pix_fmt, int width, int height);
5618 * @deprecated unused
5620 attribute_deprecated
5621 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5622 enum AVPixelFormat pix_fmt, int top_band, int left_band);
5625 * @deprecated unused
5627 attribute_deprecated
5628 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5629 int padtop, int padbottom, int padleft, int padright, int *color);
5637 * @defgroup lavc_misc Utility functions
5640 * Miscellaneous utility functions related to both encoding and decoding
5646 * @defgroup lavc_misc_pixfmt Pixel formats
5648 * Functions for working with pixel formats.
5653 * Utility function to access log2_chroma_w log2_chroma_h from
5654 * the pixel format AVPixFmtDescriptor.
5656 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
5657 * for one that returns a failure code and continues in case of invalid
5660 * @param[in] pix_fmt the pixel format
5661 * @param[out] h_shift store log2_chroma_w
5662 * @param[out] v_shift store log2_chroma_h
5664 * @see av_pix_fmt_get_chroma_sub_sample
5667 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5670 * Return a value representing the fourCC code associated to the
5671 * pixel format pix_fmt, or 0 if no associated fourCC code can be
5674 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
5677 * @deprecated see av_get_pix_fmt_loss()
5679 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5683 * Find the best pixel format to convert to given a certain source pixel
5684 * format. When converting from one pixel format to another, information loss
5685 * may occur. For example, when converting from RGB24 to GRAY, the color
5686 * information will be lost. Similarly, other losses occur when converting from
5687 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5688 * the given pixel formats should be used to suffer the least amount of loss.
5689 * The pixel formats from which it chooses one, are determined by the
5690 * pix_fmt_list parameter.
5693 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5694 * @param[in] src_pix_fmt source pixel format
5695 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5696 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5697 * @return The best pixel format to convert to or -1 if none was found.
5699 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5700 enum AVPixelFormat src_pix_fmt,
5701 int has_alpha, int *loss_ptr);
5704 * @deprecated see av_find_best_pix_fmt_of_2()
5706 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5707 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5709 attribute_deprecated
5710 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5711 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5713 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5719 #if FF_API_SET_DIMENSIONS
5721 * @deprecated this function is not supposed to be used from outside of lavc
5723 attribute_deprecated
5724 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
5727 #if FF_API_TAG_STRING
5729 * Put a string representing the codec tag codec_tag in buf.
5731 * @param buf buffer to place codec tag in
5732 * @param buf_size size in bytes of buf
5733 * @param codec_tag codec tag to assign
5734 * @return the length of the string that would have been generated if
5735 * enough space had been available, excluding the trailing null
5737 * @deprecated see av_fourcc_make_string() and av_fourcc2str().
5739 attribute_deprecated
5740 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5743 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5746 * Return a name for the specified profile, if available.
5748 * @param codec the codec that is searched for the given profile
5749 * @param profile the profile value for which a name is requested
5750 * @return A name for the profile if found, NULL otherwise.
5752 const char *av_get_profile_name(const AVCodec *codec, int profile);
5755 * Return a name for the specified profile, if available.
5757 * @param codec_id the ID of the codec to which the requested profile belongs
5758 * @param profile the profile value for which a name is requested
5759 * @return A name for the profile if found, NULL otherwise.
5761 * @note unlike av_get_profile_name(), which searches a list of profiles
5762 * supported by a specific decoder or encoder implementation, this
5763 * function searches the list of profiles from the AVCodecDescriptor
5765 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
5767 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5768 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5769 //FIXME func typedef
5772 * Fill AVFrame audio data and linesize pointers.
5774 * The buffer buf must be a preallocated buffer with a size big enough
5775 * to contain the specified samples amount. The filled AVFrame data
5776 * pointers will point to this buffer.
5778 * AVFrame extended_data channel pointers are allocated if necessary for
5781 * @param frame the AVFrame
5782 * frame->nb_samples must be set prior to calling the
5783 * function. This function fills in frame->data,
5784 * frame->extended_data, frame->linesize[0].
5785 * @param nb_channels channel count
5786 * @param sample_fmt sample format
5787 * @param buf buffer to use for frame data
5788 * @param buf_size size of buffer
5789 * @param align plane size sample alignment (0 = default)
5790 * @return >=0 on success, negative error code on failure
5791 * @todo return the size in bytes required to store the samples in
5792 * case of success, at the next libavutil bump
5794 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5795 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5796 int buf_size, int align);
5799 * Reset the internal decoder state / flush internal buffers. Should be called
5800 * e.g. when seeking or when switching to a different stream.
5802 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5803 * this invalidates the frames previously returned from the decoder. When
5804 * refcounted frames are used, the decoder just releases any references it might
5805 * keep internally, but the caller's reference remains valid.
5807 void avcodec_flush_buffers(AVCodecContext *avctx);
5810 * Return codec bits per sample.
5812 * @param[in] codec_id the codec
5813 * @return Number of bits per sample or zero if unknown for the given codec.
5815 int av_get_bits_per_sample(enum AVCodecID codec_id);
5818 * Return the PCM codec associated with a sample format.
5819 * @param be endianness, 0 for little, 1 for big,
5820 * -1 (or anything else) for native
5821 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5823 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5826 * Return codec bits per sample.
5827 * Only return non-zero if the bits per sample is exactly correct, not an
5830 * @param[in] codec_id the codec
5831 * @return Number of bits per sample or zero if unknown for the given codec.
5833 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5836 * Return audio frame duration.
5838 * @param avctx codec context
5839 * @param frame_bytes size of the frame, or 0 if unknown
5840 * @return frame duration, in samples, if known. 0 if not able to
5843 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5846 * This function is the same as av_get_audio_frame_duration(), except it works
5847 * with AVCodecParameters instead of an AVCodecContext.
5849 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
5852 typedef struct AVBitStreamFilterContext {
5854 const struct AVBitStreamFilter *filter;
5855 AVCodecParserContext *parser;
5856 struct AVBitStreamFilterContext *next;
5858 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5859 * Not for access by library users.
5862 } AVBitStreamFilterContext;
5865 typedef struct AVBSFInternal AVBSFInternal;
5868 * The bitstream filter state.
5870 * This struct must be allocated with av_bsf_alloc() and freed with
5873 * The fields in the struct will only be changed (by the caller or by the
5874 * filter) as described in their documentation, and are to be considered
5875 * immutable otherwise.
5877 typedef struct AVBSFContext {
5879 * A class for logging and AVOptions
5881 const AVClass *av_class;
5884 * The bitstream filter this context is an instance of.
5886 const struct AVBitStreamFilter *filter;
5889 * Opaque libavcodec internal data. Must not be touched by the caller in any
5892 AVBSFInternal *internal;
5895 * Opaque filter-specific private data. If filter->priv_class is non-NULL,
5896 * this is an AVOptions-enabled struct.
5901 * Parameters of the input stream. This field is allocated in
5902 * av_bsf_alloc(), it needs to be filled by the caller before
5905 AVCodecParameters *par_in;
5908 * Parameters of the output stream. This field is allocated in
5909 * av_bsf_alloc(), it is set by the filter in av_bsf_init().
5911 AVCodecParameters *par_out;
5914 * The timebase used for the timestamps of the input packets. Set by the
5915 * caller before av_bsf_init().
5917 AVRational time_base_in;
5920 * The timebase used for the timestamps of the output packets. Set by the
5921 * filter in av_bsf_init().
5923 AVRational time_base_out;
5926 typedef struct AVBitStreamFilter {
5930 * A list of codec ids supported by the filter, terminated by
5932 * May be NULL, in that case the bitstream filter works with any codec id.
5934 const enum AVCodecID *codec_ids;
5937 * A class for the private data, used to declare bitstream filter private
5938 * AVOptions. This field is NULL for bitstream filters that do not declare
5941 * If this field is non-NULL, the first member of the filter private data
5942 * must be a pointer to AVClass, which will be set by libavcodec generic
5943 * code to this class.
5945 const AVClass *priv_class;
5947 /*****************************************************************
5948 * No fields below this line are part of the public API. They
5949 * may not be used outside of libavcodec and can be changed and
5951 * New public fields should be added right above.
5952 *****************************************************************
5956 int (*init)(AVBSFContext *ctx);
5957 int (*filter)(AVBSFContext *ctx, AVPacket *pkt);
5958 void (*close)(AVBSFContext *ctx);
5959 } AVBitStreamFilter;
5963 * Register a bitstream filter.
5965 * The filter will be accessible to the application code through
5966 * av_bitstream_filter_next() or can be directly initialized with
5967 * av_bitstream_filter_init().
5969 * @see avcodec_register_all()
5971 attribute_deprecated
5972 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5975 * Create and initialize a bitstream filter context given a bitstream
5978 * The returned context must be freed with av_bitstream_filter_close().
5980 * @param name the name of the bitstream filter
5981 * @return a bitstream filter context if a matching filter was found
5982 * and successfully initialized, NULL otherwise
5984 attribute_deprecated
5985 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5990 * This function filters the buffer buf with size buf_size, and places the
5991 * filtered buffer in the buffer pointed to by poutbuf.
5993 * The output buffer must be freed by the caller.
5995 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5996 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5997 * If specified, this must point to the encoder context of the
5998 * output stream the packet is sent to.
5999 * @param args arguments which specify the filter configuration, may be NULL
6000 * @param poutbuf pointer which is updated to point to the filtered buffer
6001 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
6002 * @param buf buffer containing the data to filter
6003 * @param buf_size size in bytes of buf
6004 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
6005 * @return >= 0 in case of success, or a negative error code in case of failure
6007 * If the return value is positive, an output buffer is allocated and
6008 * is available in *poutbuf, and is distinct from the input buffer.
6010 * If the return value is 0, the output buffer is not allocated and
6011 * should be considered identical to the input buffer, or in case
6012 * *poutbuf was set it points to the input buffer (not necessarily to
6013 * its starting address). A special case is if *poutbuf was set to NULL and
6014 * *poutbuf_size was set to 0, which indicates the packet should be dropped.
6016 attribute_deprecated
6017 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
6018 AVCodecContext *avctx, const char *args,
6019 uint8_t **poutbuf, int *poutbuf_size,
6020 const uint8_t *buf, int buf_size, int keyframe);
6023 * Release bitstream filter context.
6025 * @param bsf the bitstream filter context created with
6026 * av_bitstream_filter_init(), can be NULL
6028 attribute_deprecated
6029 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
6032 * If f is NULL, return the first registered bitstream filter,
6033 * if f is non-NULL, return the next registered bitstream filter
6034 * after f, or NULL if f is the last one.
6036 * This function can be used to iterate over all registered bitstream
6039 attribute_deprecated
6040 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
6044 * @return a bitstream filter with the specified name or NULL if no such
6045 * bitstream filter exists.
6047 const AVBitStreamFilter *av_bsf_get_by_name(const char *name);
6050 * Iterate over all registered bitstream filters.
6052 * @param opaque a pointer where libavcodec will store the iteration state. Must
6053 * point to NULL to start the iteration.
6055 * @return the next registered bitstream filter or NULL when the iteration is
6058 const AVBitStreamFilter *av_bsf_next(void **opaque);
6061 * Allocate a context for a given bitstream filter. The caller must fill in the
6062 * context parameters as described in the documentation and then call
6063 * av_bsf_init() before sending any data to the filter.
6065 * @param filter the filter for which to allocate an instance.
6066 * @param ctx a pointer into which the pointer to the newly-allocated context
6067 * will be written. It must be freed with av_bsf_free() after the
6068 * filtering is done.
6070 * @return 0 on success, a negative AVERROR code on failure
6072 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **ctx);
6075 * Prepare the filter for use, after all the parameters and options have been
6078 int av_bsf_init(AVBSFContext *ctx);
6081 * Submit a packet for filtering.
6083 * After sending each packet, the filter must be completely drained by calling
6084 * av_bsf_receive_packet() repeatedly until it returns AVERROR(EAGAIN) or
6087 * @param pkt the packet to filter. The bitstream filter will take ownership of
6088 * the packet and reset the contents of pkt. pkt is not touched if an error occurs.
6089 * This parameter may be NULL, which signals the end of the stream (i.e. no more
6090 * packets will be sent). That will cause the filter to output any packets it
6091 * may have buffered internally.
6093 * @return 0 on success, a negative AVERROR on error.
6095 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt);
6098 * Retrieve a filtered packet.
6100 * @param[out] pkt this struct will be filled with the contents of the filtered
6101 * packet. It is owned by the caller and must be freed using
6102 * av_packet_unref() when it is no longer needed.
6103 * This parameter should be "clean" (i.e. freshly allocated
6104 * with av_packet_alloc() or unreffed with av_packet_unref())
6105 * when this function is called. If this function returns
6106 * successfully, the contents of pkt will be completely
6107 * overwritten by the returned data. On failure, pkt is not
6110 * @return 0 on success. AVERROR(EAGAIN) if more packets need to be sent to the
6111 * filter (using av_bsf_send_packet()) to get more output. AVERROR_EOF if there
6112 * will be no further output from the filter. Another negative AVERROR value if
6115 * @note one input packet may result in several output packets, so after sending
6116 * a packet with av_bsf_send_packet(), this function needs to be called
6117 * repeatedly until it stops returning 0. It is also possible for a filter to
6118 * output fewer packets than were sent to it, so this function may return
6119 * AVERROR(EAGAIN) immediately after a successful av_bsf_send_packet() call.
6121 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt);
6124 * Free a bitstream filter context and everything associated with it; write NULL
6125 * into the supplied pointer.
6127 void av_bsf_free(AVBSFContext **ctx);
6130 * Get the AVClass for AVBSFContext. It can be used in combination with
6131 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
6133 * @see av_opt_find().
6135 const AVClass *av_bsf_get_class(void);
6138 * Structure for chain/list of bitstream filters.
6139 * Empty list can be allocated by av_bsf_list_alloc().
6141 typedef struct AVBSFList AVBSFList;
6144 * Allocate empty list of bitstream filters.
6145 * The list must be later freed by av_bsf_list_free()
6146 * or finalized by av_bsf_list_finalize().
6148 * @return Pointer to @ref AVBSFList on success, NULL in case of failure
6150 AVBSFList *av_bsf_list_alloc(void);
6153 * Free list of bitstream filters.
6155 * @param lst Pointer to pointer returned by av_bsf_list_alloc()
6157 void av_bsf_list_free(AVBSFList **lst);
6160 * Append bitstream filter to the list of bitstream filters.
6162 * @param lst List to append to
6163 * @param bsf Filter context to be appended
6165 * @return >=0 on success, negative AVERROR in case of failure
6167 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf);
6170 * Construct new bitstream filter context given it's name and options
6171 * and append it to the list of bitstream filters.
6173 * @param lst List to append to
6174 * @param bsf_name Name of the bitstream filter
6175 * @param options Options for the bitstream filter, can be set to NULL
6177 * @return >=0 on success, negative AVERROR in case of failure
6179 int av_bsf_list_append2(AVBSFList *lst, const char * bsf_name, AVDictionary **options);
6181 * Finalize list of bitstream filters.
6183 * This function will transform @ref AVBSFList to single @ref AVBSFContext,
6184 * so the whole chain of bitstream filters can be treated as single filter
6185 * freshly allocated by av_bsf_alloc().
6186 * If the call is successful, @ref AVBSFList structure is freed and lst
6187 * will be set to NULL. In case of failure, caller is responsible for
6188 * freeing the structure by av_bsf_list_free()
6190 * @param lst Filter list structure to be transformed
6191 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6192 * representing the chain of bitstream filters
6194 * @return >=0 on success, negative AVERROR in case of failure
6196 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf);
6199 * Parse string describing list of bitstream filters and create single
6200 * @ref AVBSFContext describing the whole chain of bitstream filters.
6201 * Resulting @ref AVBSFContext can be treated as any other @ref AVBSFContext freshly
6202 * allocated by av_bsf_alloc().
6204 * @param str String describing chain of bitstream filters in format
6205 * `bsf1[=opt1=val1:opt2=val2][,bsf2]`
6206 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6207 * representing the chain of bitstream filters
6209 * @return >=0 on success, negative AVERROR in case of failure
6211 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf);
6214 * Get null/pass-through bitstream filter.
6216 * @param[out] bsf Pointer to be set to new instance of pass-through bitstream filter
6220 int av_bsf_get_null_filter(AVBSFContext **bsf);
6225 * Same behaviour av_fast_malloc but the buffer has additional
6226 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
6228 * In addition the whole buffer will initially and after resizes
6229 * be 0-initialized so that no uninitialized data will ever appear.
6231 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
6234 * Same behaviour av_fast_padded_malloc except that buffer will always
6235 * be 0-initialized after call.
6237 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
6240 * Encode extradata length to a buffer. Used by xiph codecs.
6242 * @param s buffer to write to; must be at least (v/255+1) bytes long
6243 * @param v size of extradata in bytes
6244 * @return number of bytes written to the buffer.
6246 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
6248 #if FF_API_MISSING_SAMPLE
6250 * Log a generic warning message about a missing feature. This function is
6251 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
6252 * only, and would normally not be used by applications.
6253 * @param[in] avc a pointer to an arbitrary struct of which the first field is
6254 * a pointer to an AVClass struct
6255 * @param[in] feature string containing the name of the missing feature
6256 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
6257 * If want_sample is non-zero, additional verbiage will be added to the log
6258 * message which tells the user how to report samples to the development
6260 * @deprecated Use avpriv_report_missing_feature() instead.
6262 attribute_deprecated
6263 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
6266 * Log a generic warning message asking for a sample. This function is
6267 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
6268 * only, and would normally not be used by applications.
6269 * @param[in] avc a pointer to an arbitrary struct of which the first field is
6270 * a pointer to an AVClass struct
6271 * @param[in] msg string containing an optional message, or NULL if no message
6272 * @deprecated Use avpriv_request_sample() instead.
6274 attribute_deprecated
6275 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
6276 #endif /* FF_API_MISSING_SAMPLE */
6279 * Register the hardware accelerator hwaccel.
6281 void av_register_hwaccel(AVHWAccel *hwaccel);
6284 * If hwaccel is NULL, returns the first registered hardware accelerator,
6285 * if hwaccel is non-NULL, returns the next registered hardware accelerator
6286 * after hwaccel, or NULL if hwaccel is the last one.
6288 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
6292 * Lock operation used by lockmgr
6295 AV_LOCK_CREATE, ///< Create a mutex
6296 AV_LOCK_OBTAIN, ///< Lock the mutex
6297 AV_LOCK_RELEASE, ///< Unlock the mutex
6298 AV_LOCK_DESTROY, ///< Free mutex resources
6302 * Register a user provided lock manager supporting the operations
6303 * specified by AVLockOp. The "mutex" argument to the function points
6304 * to a (void *) where the lockmgr should store/get a pointer to a user
6305 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
6306 * value left by the last call for all other ops. If the lock manager is
6307 * unable to perform the op then it should leave the mutex in the same
6308 * state as when it was called and return a non-zero value. However,
6309 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
6310 * have been successfully destroyed. If av_lockmgr_register succeeds
6311 * it will return a non-negative value, if it fails it will return a
6312 * negative value and destroy all mutex and unregister all callbacks.
6313 * av_lockmgr_register is not thread-safe, it must be called from a
6314 * single thread before any calls which make use of locking are used.
6316 * @param cb User defined callback. av_lockmgr_register invokes calls
6317 * to this callback and the previously registered callback.
6318 * The callback will be used to create more than one mutex
6319 * each of which must be backed by its own underlying locking
6320 * mechanism (i.e. do not use a single static object to
6321 * implement your lock manager). If cb is set to NULL the
6322 * lockmgr will be unregistered.
6324 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
6327 * Get the type of the given codec.
6329 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
6332 * Get the name of a codec.
6333 * @return a static string identifying the codec; never NULL
6335 const char *avcodec_get_name(enum AVCodecID id);
6338 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
6339 * with no corresponding avcodec_close()), 0 otherwise.
6341 int avcodec_is_open(AVCodecContext *s);
6344 * @return a non-zero number if codec is an encoder, zero otherwise
6346 int av_codec_is_encoder(const AVCodec *codec);
6349 * @return a non-zero number if codec is a decoder, zero otherwise
6351 int av_codec_is_decoder(const AVCodec *codec);
6354 * @return descriptor for given codec ID or NULL if no descriptor exists.
6356 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
6359 * Iterate over all codec descriptors known to libavcodec.
6361 * @param prev previous descriptor. NULL to get the first descriptor.
6363 * @return next descriptor or NULL after the last descriptor
6365 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
6368 * @return codec descriptor with the given name or NULL if no such descriptor
6371 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
6374 * Allocate a CPB properties structure and initialize its fields to default
6377 * @param size if non-NULL, the size of the allocated struct will be written
6378 * here. This is useful for embedding it in side data.
6380 * @return the newly allocated struct or NULL on failure
6382 AVCPBProperties *av_cpb_properties_alloc(size_t *size);
6388 #endif /* AVCODEC_AVCODEC_H */