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/hwcontext.h"
40 #include "libavutil/log.h"
41 #include "libavutil/pixfmt.h"
42 #include "libavutil/rational.h"
47 * @defgroup libavc libavcodec
48 * Encoding/Decoding Library
52 * @defgroup lavc_decoding Decoding
56 * @defgroup lavc_encoding Encoding
60 * @defgroup lavc_codec Codecs
62 * @defgroup lavc_codec_native Native Codecs
65 * @defgroup lavc_codec_wrappers External library wrappers
68 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
72 * @defgroup lavc_internal Internal
80 * @defgroup lavc_encdec send/receive encoding and decoding API overview
83 * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
84 * avcodec_receive_packet() functions provide an encode/decode API, which
85 * decouples input and output.
87 * The API is very similar for encoding/decoding and audio/video, and works as
89 * - Set up and open the AVCodecContext as usual.
91 * - For decoding, call avcodec_send_packet() to give the decoder raw
92 * compressed data in an AVPacket.
93 * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
94 * containing uncompressed audio or video.
95 * In both cases, it is recommended that AVPackets and AVFrames are
96 * refcounted, or libavcodec might have to copy the input data. (libavformat
97 * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
98 * refcounted AVFrames.)
99 * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
100 * functions and process their output:
101 * - For decoding, call avcodec_receive_frame(). On success, it will return
102 * an AVFrame containing uncompressed audio or video data.
103 * - For encoding, call avcodec_receive_packet(). On success, it will return
104 * an AVPacket with a compressed frame.
105 * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
106 * AVERROR(EAGAIN) return value means that new input data is required to
107 * return new output. In this case, continue with sending input. For each
108 * input frame/packet, the codec will typically return 1 output frame/packet,
109 * but it can also be 0 or more than 1.
111 * At the beginning of decoding or encoding, the codec might accept multiple
112 * input frames/packets without returning a frame, until its internal buffers
113 * are filled. This situation is handled transparently if you follow the steps
116 * In theory, sending input can result in EAGAIN - this should happen only if
117 * not all output was received. You can use this to structure alternative decode
118 * or encode loops other than the one suggested above. For example, you could
119 * try sending new input on each iteration, and try to receive output if that
122 * End of stream situations. These require "flushing" (aka draining) the codec,
123 * as the codec might buffer multiple frames or packets internally for
124 * performance or out of necessity (consider B-frames).
125 * This is handled as follows:
126 * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
127 * or avcodec_send_frame() (encoding) functions. This will enter draining
129 * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
130 * (encoding) in a loop until AVERROR_EOF is returned. The functions will
131 * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
132 * - Before decoding can be resumed again, the codec has to be reset with
133 * avcodec_flush_buffers().
135 * Using the API as outlined above is highly recommended. But it is also
136 * possible to call functions outside of this rigid schema. For example, you can
137 * call avcodec_send_packet() repeatedly without calling
138 * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
139 * until the codec's internal buffer has been filled up (which is typically of
140 * size 1 per output frame, after initial input), and then reject input with
141 * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
142 * read at least some output.
144 * Not all codecs will follow a rigid and predictable dataflow; the only
145 * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
146 * one end implies that a receive/send call on the other end will succeed, or
147 * at least will not fail with AVERROR(EAGAIN). In general, no codec will
148 * permit unlimited buffering of input or output.
150 * This API replaces the following legacy functions:
151 * - avcodec_decode_video2() and avcodec_decode_audio4():
152 * Use avcodec_send_packet() to feed input to the decoder, then use
153 * avcodec_receive_frame() to receive decoded frames after each packet.
154 * Unlike with the old video decoding API, multiple frames might result from
155 * a packet. For audio, splitting the input packet into frames by partially
156 * decoding packets becomes transparent to the API user. You never need to
157 * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
158 * no data was read from the packet).
159 * Additionally, sending a flush/draining packet is required only once.
160 * - avcodec_encode_video2()/avcodec_encode_audio2():
161 * Use avcodec_send_frame() to feed input to the encoder, then use
162 * avcodec_receive_packet() to receive encoded packets.
163 * Providing user-allocated buffers for avcodec_receive_packet() is not
165 * - The new API does not handle subtitles yet.
167 * Mixing new and old function calls on the same AVCodecContext is not allowed,
168 * and will result in undefined behavior.
170 * Some codecs might require using the new API; using the old API will return
171 * an error when calling it. All codecs support the new API.
173 * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
174 * would be an invalid state, which could put the codec user into an endless
175 * loop. The API has no concept of time either: it cannot happen that trying to
176 * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
177 * later accepts the packet (with no other receive/flush API calls involved).
178 * The API is a strict state machine, and the passage of time is not supposed
179 * to influence it. Some timing-dependent behavior might still be deemed
180 * acceptable in certain cases. But it must never result in both send/receive
181 * returning EAGAIN at the same time at any point. It must also absolutely be
182 * avoided that the current state is "unstable" and can "flip-flop" between
183 * the send/receive APIs allowing progress. For example, it's not allowed that
184 * the codec randomly decides that it actually wants to consume a packet now
185 * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
186 * avcodec_send_packet() call.
191 * @defgroup lavc_core Core functions/structures.
194 * Basic definitions, functions for querying libavcodec capabilities,
195 * allocating core structures, etc.
201 * Identify the syntax and semantics of the bitstream.
202 * The principle is roughly:
203 * Two decoders with the same ID can decode the same streams.
204 * Two encoders with the same ID can encode compatible streams.
205 * There may be slight deviations from the principle due to implementation
208 * If you add a codec ID to this list, add it so that
209 * 1. no value of an existing codec ID changes (that would break ABI),
210 * 2. it is as close as possible to similar codecs
212 * After adding new codec IDs, do not forget to add an entry to the codec
213 * descriptor list and bump libavcodec minor version.
219 AV_CODEC_ID_MPEG1VIDEO,
220 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
231 AV_CODEC_ID_RAWVIDEO,
232 AV_CODEC_ID_MSMPEG4V1,
233 AV_CODEC_ID_MSMPEG4V2,
234 AV_CODEC_ID_MSMPEG4V3,
257 AV_CODEC_ID_INTERPLAY_VIDEO,
264 AV_CODEC_ID_MSVIDEO1,
269 AV_CODEC_ID_TRUEMOTION1,
270 AV_CODEC_ID_VMDVIDEO,
295 AV_CODEC_ID_TRUEMOTION2,
301 AV_CODEC_ID_SMACKVIDEO,
306 AV_CODEC_ID_JPEG2000,
312 AV_CODEC_ID_DSICINVIDEO,
313 AV_CODEC_ID_TIERTEXSEQVIDEO,
321 AV_CODEC_ID_BETHSOFTVID,
333 AV_CODEC_ID_ESCAPE124,
337 AV_CODEC_ID_MOTIONPIXELS,
349 AV_CODEC_ID_FLASHSV2,
350 AV_CODEC_ID_CDGRAPHICS,
353 AV_CODEC_ID_BINKVIDEO,
354 AV_CODEC_ID_IFF_ILBM,
355 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
361 AV_CODEC_ID_A64_MULTI,
362 AV_CODEC_ID_A64_MULTI5,
365 AV_CODEC_ID_LAGARITH,
369 AV_CODEC_ID_WMV3IMAGE,
370 AV_CODEC_ID_VC1IMAGE,
372 AV_CODEC_ID_BMV_VIDEO,
379 AV_CODEC_ID_ZEROCODEC,
388 AV_CODEC_ID_ESCAPE130,
391 AV_CODEC_ID_HNM4_VIDEO,
393 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
395 AV_CODEC_ID_ALIAS_PIX,
396 AV_CODEC_ID_BRENDER_PIX,
397 AV_CODEC_ID_PAF_VIDEO,
410 AV_CODEC_ID_SCREENPRESSO,
414 AV_CODEC_ID_Y41P = 0x8000,
419 AV_CODEC_ID_TARGA_Y216,
431 AV_CODEC_ID_TRUEMOTION2RT,
433 AV_CODEC_ID_MAGICYUV,
434 AV_CODEC_ID_SHEERVIDEO,
441 AV_CODEC_ID_CLEARVIDEO,
444 AV_CODEC_ID_BITPACKED,
451 AV_CODEC_ID_PROSUMER,
465 /* various PCM "codecs" */
466 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
467 AV_CODEC_ID_PCM_S16LE = 0x10000,
468 AV_CODEC_ID_PCM_S16BE,
469 AV_CODEC_ID_PCM_U16LE,
470 AV_CODEC_ID_PCM_U16BE,
473 AV_CODEC_ID_PCM_MULAW,
474 AV_CODEC_ID_PCM_ALAW,
475 AV_CODEC_ID_PCM_S32LE,
476 AV_CODEC_ID_PCM_S32BE,
477 AV_CODEC_ID_PCM_U32LE,
478 AV_CODEC_ID_PCM_U32BE,
479 AV_CODEC_ID_PCM_S24LE,
480 AV_CODEC_ID_PCM_S24BE,
481 AV_CODEC_ID_PCM_U24LE,
482 AV_CODEC_ID_PCM_U24BE,
483 AV_CODEC_ID_PCM_S24DAUD,
484 AV_CODEC_ID_PCM_ZORK,
485 AV_CODEC_ID_PCM_S16LE_PLANAR,
487 AV_CODEC_ID_PCM_F32BE,
488 AV_CODEC_ID_PCM_F32LE,
489 AV_CODEC_ID_PCM_F64BE,
490 AV_CODEC_ID_PCM_F64LE,
491 AV_CODEC_ID_PCM_BLURAY,
494 AV_CODEC_ID_PCM_S8_PLANAR,
495 AV_CODEC_ID_PCM_S24LE_PLANAR,
496 AV_CODEC_ID_PCM_S32LE_PLANAR,
497 AV_CODEC_ID_PCM_S16BE_PLANAR,
499 AV_CODEC_ID_PCM_S64LE = 0x10800,
500 AV_CODEC_ID_PCM_S64BE,
501 AV_CODEC_ID_PCM_F16LE,
502 AV_CODEC_ID_PCM_F24LE,
503 AV_CODEC_ID_PCM_VIDC,
505 /* various ADPCM codecs */
506 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
507 AV_CODEC_ID_ADPCM_IMA_WAV,
508 AV_CODEC_ID_ADPCM_IMA_DK3,
509 AV_CODEC_ID_ADPCM_IMA_DK4,
510 AV_CODEC_ID_ADPCM_IMA_WS,
511 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
512 AV_CODEC_ID_ADPCM_MS,
513 AV_CODEC_ID_ADPCM_4XM,
514 AV_CODEC_ID_ADPCM_XA,
515 AV_CODEC_ID_ADPCM_ADX,
516 AV_CODEC_ID_ADPCM_EA,
517 AV_CODEC_ID_ADPCM_G726,
518 AV_CODEC_ID_ADPCM_CT,
519 AV_CODEC_ID_ADPCM_SWF,
520 AV_CODEC_ID_ADPCM_YAMAHA,
521 AV_CODEC_ID_ADPCM_SBPRO_4,
522 AV_CODEC_ID_ADPCM_SBPRO_3,
523 AV_CODEC_ID_ADPCM_SBPRO_2,
524 AV_CODEC_ID_ADPCM_THP,
525 AV_CODEC_ID_ADPCM_IMA_AMV,
526 AV_CODEC_ID_ADPCM_EA_R1,
527 AV_CODEC_ID_ADPCM_EA_R3,
528 AV_CODEC_ID_ADPCM_EA_R2,
529 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
530 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
531 AV_CODEC_ID_ADPCM_EA_XAS,
532 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
533 AV_CODEC_ID_ADPCM_IMA_ISS,
534 AV_CODEC_ID_ADPCM_G722,
535 AV_CODEC_ID_ADPCM_IMA_APC,
536 AV_CODEC_ID_ADPCM_VIMA,
538 AV_CODEC_ID_ADPCM_AFC = 0x11800,
539 AV_CODEC_ID_ADPCM_IMA_OKI,
540 AV_CODEC_ID_ADPCM_DTK,
541 AV_CODEC_ID_ADPCM_IMA_RAD,
542 AV_CODEC_ID_ADPCM_G726LE,
543 AV_CODEC_ID_ADPCM_THP_LE,
544 AV_CODEC_ID_ADPCM_PSX,
545 AV_CODEC_ID_ADPCM_AICA,
546 AV_CODEC_ID_ADPCM_IMA_DAT4,
547 AV_CODEC_ID_ADPCM_MTAF,
548 AV_CODEC_ID_ADPCM_AGM,
549 AV_CODEC_ID_ADPCM_ARGO,
550 AV_CODEC_ID_ADPCM_IMA_SSI,
551 AV_CODEC_ID_ADPCM_ZORK,
554 AV_CODEC_ID_AMR_NB = 0x12000,
557 /* RealAudio codecs*/
558 AV_CODEC_ID_RA_144 = 0x13000,
561 /* various DPCM codecs */
562 AV_CODEC_ID_ROQ_DPCM = 0x14000,
563 AV_CODEC_ID_INTERPLAY_DPCM,
564 AV_CODEC_ID_XAN_DPCM,
565 AV_CODEC_ID_SOL_DPCM,
567 AV_CODEC_ID_SDX2_DPCM = 0x14800,
568 AV_CODEC_ID_GREMLIN_DPCM,
571 AV_CODEC_ID_MP2 = 0x15000,
572 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
582 AV_CODEC_ID_VMDAUDIO,
588 AV_CODEC_ID_WESTWOOD_SND1,
589 AV_CODEC_ID_GSM, ///< as in Berlin toast format
592 AV_CODEC_ID_TRUESPEECH,
594 AV_CODEC_ID_SMACKAUDIO,
597 AV_CODEC_ID_DSICINAUDIO,
599 AV_CODEC_ID_MUSEPACK7,
601 AV_CODEC_ID_GSM_MS, /* as found in WAV */
604 AV_CODEC_ID_NELLYMOSER,
605 AV_CODEC_ID_MUSEPACK8,
607 AV_CODEC_ID_WMAVOICE,
609 AV_CODEC_ID_WMALOSSLESS,
618 AV_CODEC_ID_BINKAUDIO_RDFT,
619 AV_CODEC_ID_BINKAUDIO_DCT,
620 AV_CODEC_ID_AAC_LATM,
625 AV_CODEC_ID_8SVX_EXP,
626 AV_CODEC_ID_8SVX_FIB,
627 AV_CODEC_ID_BMV_AUDIO,
632 AV_CODEC_ID_COMFORT_NOISE,
634 AV_CODEC_ID_METASOUND,
635 AV_CODEC_ID_PAF_AUDIO,
640 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
642 AV_CODEC_ID_SONIC_LS,
645 AV_CODEC_ID_DSD_LSBF,
646 AV_CODEC_ID_DSD_MSBF,
647 AV_CODEC_ID_DSD_LSBF_PLANAR,
648 AV_CODEC_ID_DSD_MSBF_PLANAR,
650 AV_CODEC_ID_INTERPLAY_ACM,
654 AV_CODEC_ID_ATRAC3AL,
655 AV_CODEC_ID_ATRAC3PAL,
662 AV_CODEC_ID_ACELP_KELVIN,
663 AV_CODEC_ID_MPEGH_3D_AUDIO,
666 /* subtitle codecs */
667 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
668 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
669 AV_CODEC_ID_DVB_SUBTITLE,
670 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
673 AV_CODEC_ID_MOV_TEXT,
674 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
675 AV_CODEC_ID_DVB_TELETEXT,
678 AV_CODEC_ID_MICRODVD = 0x17800,
682 AV_CODEC_ID_REALTEXT,
684 AV_CODEC_ID_SUBVIEWER1,
685 AV_CODEC_ID_SUBVIEWER,
692 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
694 AV_CODEC_ID_ARIB_CAPTION,
696 /* other specific kind of codecs (generally used for attachments) */
697 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
698 AV_CODEC_ID_TTF = 0x18000,
700 AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
702 AV_CODEC_ID_BINTEXT = 0x18800,
706 AV_CODEC_ID_SMPTE_KLV,
708 AV_CODEC_ID_TIMED_ID3,
709 AV_CODEC_ID_BIN_DATA,
712 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
714 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
715 * stream (only used by libavformat) */
716 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
717 * stream (only used by libavformat) */
718 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
719 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
723 * This struct describes the properties of a single codec described by an
725 * @see avcodec_descriptor_get()
727 typedef struct AVCodecDescriptor {
729 enum AVMediaType type;
731 * Name of the codec described by this descriptor. It is non-empty and
732 * unique for each codec descriptor. It should contain alphanumeric
733 * characters and '_' only.
737 * A more descriptive name for this codec. May be NULL.
739 const char *long_name;
741 * Codec properties, a combination of AV_CODEC_PROP_* flags.
745 * MIME type(s) associated with the codec.
746 * May be NULL; if not, a NULL-terminated array of MIME types.
747 * The first item is always non-NULL and is the preferred MIME type.
749 const char *const *mime_types;
751 * If non-NULL, an array of profiles recognized for this codec.
752 * Terminated with FF_PROFILE_UNKNOWN.
754 const struct AVProfile *profiles;
758 * Codec uses only intra compression.
759 * Video and audio codecs only.
761 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
763 * Codec supports lossy compression. Audio and video codecs only.
764 * @note a codec may support both lossy and lossless
767 #define AV_CODEC_PROP_LOSSY (1 << 1)
769 * Codec supports lossless compression. Audio and video codecs only.
771 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
773 * Codec supports frame reordering. That is, the coded order (the order in which
774 * the encoded packets are output by the encoders / stored / input to the
775 * decoders) may be different from the presentation order of the corresponding
778 * For codecs that do not have this property set, PTS and DTS should always be
781 #define AV_CODEC_PROP_REORDER (1 << 3)
783 * Subtitle codec is bitmap based
784 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
786 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
788 * Subtitle codec is text based.
789 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
791 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
794 * @ingroup lavc_decoding
795 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
796 * This is mainly needed because some optimized bitstream readers read
797 * 32 or 64 bit at once and could read over the end.<br>
798 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
799 * MPEG bitstreams could cause overread and segfault.
801 #define AV_INPUT_BUFFER_PADDING_SIZE 64
804 * @ingroup lavc_encoding
805 * minimum encoding buffer size
806 * Used to avoid some checks during header writing.
808 #define AV_INPUT_BUFFER_MIN_SIZE 16384
811 * @ingroup lavc_decoding
814 /* We leave some space between them for extensions (drop some
815 * keyframes for intra-only or drop just some bidir frames). */
816 AVDISCARD_NONE =-16, ///< discard nothing
817 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
818 AVDISCARD_NONREF = 8, ///< discard all non reference
819 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
820 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
821 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
822 AVDISCARD_ALL = 48, ///< discard all
825 enum AVAudioServiceType {
826 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
827 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
828 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
829 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
830 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
831 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
832 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
833 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
834 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
835 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
839 * @ingroup lavc_encoding
841 typedef struct RcOverride{
844 int qscale; // If this is 0 then quality_factor will be used instead.
845 float quality_factor;
849 These flags can be passed in AVCodecContext.flags before initialization.
850 Note: Not everything is supported yet.
854 * Allow decoders to produce frames with data planes that are not aligned
855 * to CPU requirements (e.g. due to cropping).
857 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
861 #define AV_CODEC_FLAG_QSCALE (1 << 1)
863 * 4 MV per MB allowed / advanced prediction for H.263.
865 #define AV_CODEC_FLAG_4MV (1 << 2)
867 * Output even those frames that might be corrupted.
869 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
873 #define AV_CODEC_FLAG_QPEL (1 << 4)
875 * Don't output frames whose parameters differ from first
876 * decoded frame in stream.
878 #define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
880 * Use internal 2pass ratecontrol in first pass mode.
882 #define AV_CODEC_FLAG_PASS1 (1 << 9)
884 * Use internal 2pass ratecontrol in second pass mode.
886 #define AV_CODEC_FLAG_PASS2 (1 << 10)
890 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
892 * Only decode/encode grayscale.
894 #define AV_CODEC_FLAG_GRAY (1 << 13)
896 * error[?] variables will be set during encoding.
898 #define AV_CODEC_FLAG_PSNR (1 << 15)
900 * Input bitstream might be truncated at a random location
901 * instead of only at frame boundaries.
903 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
905 * Use interlaced DCT.
907 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
911 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
913 * Place global headers in extradata instead of every keyframe.
915 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
917 * Use only bitexact stuff (except (I)DCT).
919 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
920 /* Fx : Flag for H.263+ extra options */
922 * H.263 advanced intra coding / MPEG-4 AC prediction
924 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
926 * interlaced motion estimation
928 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
929 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
932 * Allow non spec compliant speedup tricks.
934 #define AV_CODEC_FLAG2_FAST (1 << 0)
936 * Skip bitstream encoding.
938 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
940 * Place global headers at every keyframe instead of in extradata.
942 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
945 * timecode is in drop frame format. DEPRECATED!!!!
947 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
950 * Input bitstream might be truncated at a packet boundaries
951 * instead of only at frame boundaries.
953 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
955 * Discard cropping information from SPS.
957 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
960 * Show all frames before the first keyframe
962 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
964 * Export motion vectors through frame side data
966 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
968 * Do not skip samples and export skip information as frame side data
970 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
972 * Do not reset ASS ReadOrder field on flush (subtitles decoding)
974 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
976 /* Unsupported options :
977 * Syntax Arithmetic coding (SAC)
978 * Reference Picture Selection
979 * Independent Segment Decoding */
981 /* codec capabilities */
984 * Decoder can use draw_horiz_band callback.
986 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
988 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
989 * If not set, it might not use get_buffer() at all or use operations that
990 * assume the buffer was allocated by avcodec_default_get_buffer.
992 #define AV_CODEC_CAP_DR1 (1 << 1)
993 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
995 * Encoder or decoder requires flushing with NULL input at the end in order to
996 * give the complete and correct output.
998 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
999 * with NULL data. The user can still send NULL data to the public encode
1000 * or decode function, but libavcodec will not pass it along to the codec
1001 * unless this flag is set.
1004 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1005 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1009 * The encoder needs to be fed with NULL data at the end of encoding until the
1010 * encoder no longer returns data.
1012 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1013 * flag also means that the encoder must set the pts and duration for
1014 * each output packet. If this flag is not set, the pts and duration will
1015 * be determined by libavcodec from the input frame.
1017 #define AV_CODEC_CAP_DELAY (1 << 5)
1019 * Codec can be fed a final frame with a smaller size.
1020 * This can be used to prevent truncation of the last audio samples.
1022 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
1025 * Codec can output multiple frames per AVPacket
1026 * Normally demuxers return one frame at a time, demuxers which do not do
1027 * are connected to a parser to split what they return into proper frames.
1028 * This flag is reserved to the very rare category of codecs which have a
1029 * bitstream that cannot be split into frames without timeconsuming
1030 * operations like full decoding. Demuxers carrying such bitstreams thus
1031 * may return multiple frames in a packet. This has many disadvantages like
1032 * prohibiting stream copy in many cases thus it should only be considered
1035 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
1037 * Codec is experimental and is thus avoided in favor of non experimental
1040 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
1042 * Codec should fill in channel configuration and samplerate instead of container
1044 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
1046 * Codec supports frame-level multithreading.
1048 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
1050 * Codec supports slice-based (or partition-based) multithreading.
1052 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
1054 * Codec supports changed parameters at any point.
1056 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
1058 * Codec supports avctx->thread_count == 0 (auto).
1060 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
1062 * Audio encoder supports receiving a different number of samples in each call.
1064 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
1066 * Decoder is not a preferred choice for probing.
1067 * This indicates that the decoder is not a good choice for probing.
1068 * It could for example be an expensive to spin up hardware decoder,
1069 * or it could simply not provide a lot of useful information about
1071 * A decoder marked with this flag should only be used as last resort
1072 * choice for probing.
1074 #define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
1076 * Codec is intra only.
1078 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
1080 * Codec is lossless.
1082 #define AV_CODEC_CAP_LOSSLESS 0x80000000
1085 * Codec is backed by a hardware implementation. Typically used to
1086 * identify a non-hwaccel hardware decoder. For information about hwaccels, use
1087 * avcodec_get_hw_config() instead.
1089 #define AV_CODEC_CAP_HARDWARE (1 << 18)
1092 * Codec is potentially backed by a hardware implementation, but not
1093 * necessarily. This is used instead of AV_CODEC_CAP_HARDWARE, if the
1094 * implementation provides some sort of internal fallback.
1096 #define AV_CODEC_CAP_HYBRID (1 << 19)
1099 * This codec takes the reordered_opaque field from input AVFrames
1100 * and returns it in the corresponding field in AVCodecContext after
1103 #define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE (1 << 20)
1107 * This specifies the area which should be displayed.
1108 * Note there may be multiple such areas for one frame.
1110 typedef struct AVPanScan {
1113 * - encoding: Set by user.
1114 * - decoding: Set by libavcodec.
1119 * width and height in 1/16 pel
1120 * - encoding: Set by user.
1121 * - decoding: Set by libavcodec.
1127 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1128 * - encoding: Set by user.
1129 * - decoding: Set by libavcodec.
1131 int16_t position[3][2];
1135 * This structure describes the bitrate properties of an encoded bitstream. It
1136 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1137 * parameters for H.264/HEVC.
1139 typedef struct AVCPBProperties {
1141 * Maximum bitrate of the stream, in bits per second.
1142 * Zero if unknown or unspecified.
1144 #if FF_API_UNSANITIZED_BITRATES
1147 int64_t max_bitrate;
1150 * Minimum bitrate of the stream, in bits per second.
1151 * Zero if unknown or unspecified.
1153 #if FF_API_UNSANITIZED_BITRATES
1156 int64_t min_bitrate;
1159 * Average bitrate of the stream, in bits per second.
1160 * Zero if unknown or unspecified.
1162 #if FF_API_UNSANITIZED_BITRATES
1165 int64_t avg_bitrate;
1169 * The size of the buffer to which the ratecontrol is applied, in bits.
1170 * Zero if unknown or unspecified.
1175 * The delay between the time the packet this structure is associated with
1176 * is received and the time when it should be decoded, in periods of a 27MHz
1179 * UINT64_MAX when unknown or unspecified.
1184 typedef struct AVProducerReferenceTime {
1187 } AVProducerReferenceTime;
1190 * The decoder will keep a reference to the frame and may reuse it later.
1192 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1195 * @defgroup lavc_packet AVPacket
1197 * Types and functions for working with AVPacket.
1200 enum AVPacketSideDataType {
1202 * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1203 * bytes worth of palette. This side data signals that a new palette is
1206 AV_PKT_DATA_PALETTE,
1209 * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1210 * that the extradata buffer was changed and the receiving side should
1211 * act upon it appropriately. The new extradata is embedded in the side
1212 * data buffer and should be immediately used for processing the current
1215 AV_PKT_DATA_NEW_EXTRADATA,
1218 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1221 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1222 * s32le channel_count
1223 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1224 * u64le channel_layout
1225 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1227 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1232 AV_PKT_DATA_PARAM_CHANGE,
1235 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1236 * structures with info about macroblocks relevant to splitting the
1237 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1238 * That is, it does not necessarily contain info about all macroblocks,
1239 * as long as the distance between macroblocks in the info is smaller
1240 * than the target payload size.
1241 * Each MB info structure is 12 bytes, and is laid out as follows:
1243 * u32le bit offset from the start of the packet
1244 * u8 current quantizer at the start of the macroblock
1246 * u16le macroblock address within the GOB
1247 * u8 horizontal MV predictor
1248 * u8 vertical MV predictor
1249 * u8 horizontal MV predictor for block number 3
1250 * u8 vertical MV predictor for block number 3
1253 AV_PKT_DATA_H263_MB_INFO,
1256 * This side data should be associated with an audio stream and contains
1257 * ReplayGain information in form of the AVReplayGain struct.
1259 AV_PKT_DATA_REPLAYGAIN,
1262 * This side data contains a 3x3 transformation matrix describing an affine
1263 * transformation that needs to be applied to the decoded video frames for
1264 * correct presentation.
1266 * See libavutil/display.h for a detailed description of the data.
1268 AV_PKT_DATA_DISPLAYMATRIX,
1271 * This side data should be associated with a video stream and contains
1272 * Stereoscopic 3D information in form of the AVStereo3D struct.
1274 AV_PKT_DATA_STEREO3D,
1277 * This side data should be associated with an audio stream and corresponds
1278 * to enum AVAudioServiceType.
1280 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1283 * This side data contains quality related information from the encoder.
1285 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1289 * u64le[error count] sum of squared differences between encoder in and output
1292 AV_PKT_DATA_QUALITY_STATS,
1295 * This side data contains an integer value representing the stream index
1296 * of a "fallback" track. A fallback track indicates an alternate
1297 * track to use when the current track can not be decoded for some reason.
1298 * e.g. no decoder available for codec.
1300 AV_PKT_DATA_FALLBACK_TRACK,
1303 * This side data corresponds to the AVCPBProperties struct.
1305 AV_PKT_DATA_CPB_PROPERTIES,
1308 * Recommmends skipping the specified number of samples
1310 * u32le number of samples to skip from start of this packet
1311 * u32le number of samples to skip from end of this packet
1312 * u8 reason for start skip
1313 * u8 reason for end skip (0=padding silence, 1=convergence)
1316 AV_PKT_DATA_SKIP_SAMPLES,
1319 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1320 * the packet may contain "dual mono" audio specific to Japanese DTV
1321 * and if it is true, recommends only the selected channel to be used.
1323 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1326 AV_PKT_DATA_JP_DUALMONO,
1329 * A list of zero terminated key/value strings. There is no end marker for
1330 * the list, so it is required to rely on the side data size to stop.
1332 AV_PKT_DATA_STRINGS_METADATA,
1335 * Subtitle event position
1343 AV_PKT_DATA_SUBTITLE_POSITION,
1346 * Data found in BlockAdditional element of matroska container. There is
1347 * no end marker for the data, so it is required to rely on the side data
1348 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1351 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1354 * The optional first identifier line of a WebVTT cue.
1356 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1359 * The optional settings (rendering instructions) that immediately
1360 * follow the timestamp specifier of a WebVTT cue.
1362 AV_PKT_DATA_WEBVTT_SETTINGS,
1365 * A list of zero terminated key/value strings. There is no end marker for
1366 * the list, so it is required to rely on the side data size to stop. This
1367 * side data includes updated metadata which appeared in the stream.
1369 AV_PKT_DATA_METADATA_UPDATE,
1372 * MPEGTS stream ID as uint8_t, this is required to pass the stream ID
1373 * information from the demuxer to the corresponding muxer.
1375 AV_PKT_DATA_MPEGTS_STREAM_ID,
1378 * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1379 * should be associated with a video stream and contains data in the form
1380 * of the AVMasteringDisplayMetadata struct.
1382 AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
1385 * This side data should be associated with a video stream and corresponds
1386 * to the AVSphericalMapping structure.
1388 AV_PKT_DATA_SPHERICAL,
1391 * Content light level (based on CTA-861.3). This metadata should be
1392 * associated with a video stream and contains data in the form of the
1393 * AVContentLightMetadata struct.
1395 AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
1398 * ATSC A53 Part 4 Closed Captions. This metadata should be associated with
1399 * a video stream. A53 CC bitstream is stored as uint8_t in AVPacketSideData.data.
1400 * The number of bytes of CC data is AVPacketSideData.size.
1405 * This side data is encryption initialization data.
1406 * The format is not part of ABI, use av_encryption_init_info_* methods to
1409 AV_PKT_DATA_ENCRYPTION_INIT_INFO,
1412 * This side data contains encryption info for how to decrypt the packet.
1413 * The format is not part of ABI, use av_encryption_info_* methods to access.
1415 AV_PKT_DATA_ENCRYPTION_INFO,
1418 * Active Format Description data consisting of a single byte as specified
1419 * in ETSI TS 101 154 using AVActiveFormatDescription enum.
1424 * Producer Reference Time data corresponding to the AVProducerReferenceTime struct.
1429 * The number of side data types.
1430 * This is not part of the public API/ABI in the sense that it may
1431 * change when new side data types are added.
1432 * This must stay the last enum value.
1433 * If its value becomes huge, some code using it
1434 * needs to be updated as it assumes it to be smaller than other limits.
1439 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1441 typedef struct AVPacketSideData {
1444 enum AVPacketSideDataType type;
1448 * This structure stores compressed data. It is typically exported by demuxers
1449 * and then passed as input to decoders, or received as output from encoders and
1450 * then passed to muxers.
1452 * For video, it should typically contain one compressed frame. For audio it may
1453 * contain several compressed frames. Encoders are allowed to output empty
1454 * packets, with no compressed data, containing only side data
1455 * (e.g. to update some stream parameters at the end of encoding).
1457 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1458 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1459 * without libavcodec and libavformat major bump.
1461 * The semantics of data ownership depends on the buf field.
1462 * If it is set, the packet data is dynamically allocated and is
1463 * valid indefinitely until a call to av_packet_unref() reduces the
1464 * reference count to 0.
1466 * If the buf field is not set av_packet_ref() would make a copy instead
1467 * of increasing the reference count.
1469 * The side data is always allocated with av_malloc(), copied by
1470 * av_packet_ref() and freed by av_packet_unref().
1472 * @see av_packet_ref
1473 * @see av_packet_unref
1475 typedef struct AVPacket {
1477 * A reference to the reference-counted buffer where the packet data is
1479 * May be NULL, then the packet data is not reference-counted.
1483 * Presentation timestamp in AVStream->time_base units; the time at which
1484 * the decompressed packet will be presented to the user.
1485 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1486 * pts MUST be larger or equal to dts as presentation cannot happen before
1487 * decompression, unless one wants to view hex dumps. Some formats misuse
1488 * the terms dts and pts/cts to mean something different. Such timestamps
1489 * must be converted to true pts/dts before they are stored in AVPacket.
1493 * Decompression timestamp in AVStream->time_base units; the time at which
1494 * the packet is decompressed.
1495 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1502 * A combination of AV_PKT_FLAG values
1506 * Additional packet data that can be provided by the container.
1507 * Packet can contain several types of side information.
1509 AVPacketSideData *side_data;
1510 int side_data_elems;
1513 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1514 * Equals next_pts - this_pts in presentation order.
1518 int64_t pos; ///< byte position in stream, -1 if unknown
1520 #if FF_API_CONVERGENCE_DURATION
1522 * @deprecated Same as the duration field, but as int64_t. This was required
1523 * for Matroska subtitles, whose duration values could overflow when the
1524 * duration field was still an int.
1526 attribute_deprecated
1527 int64_t convergence_duration;
1530 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1531 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1533 * Flag is used to discard packets which are required to maintain valid
1534 * decoder state but are not required for output and should be dropped
1537 #define AV_PKT_FLAG_DISCARD 0x0004
1539 * The packet comes from a trusted source.
1541 * Otherwise-unsafe constructs such as arbitrary pointers to data
1542 * outside the packet may be followed.
1544 #define AV_PKT_FLAG_TRUSTED 0x0008
1546 * Flag is used to indicate packets that contain frames that can
1547 * be discarded by the decoder. I.e. Non-reference frames.
1549 #define AV_PKT_FLAG_DISPOSABLE 0x0010
1552 enum AVSideDataParamChangeFlags {
1553 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1554 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1555 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1556 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1562 struct AVCodecInternal;
1566 AV_FIELD_PROGRESSIVE,
1567 AV_FIELD_TT, //< Top coded_first, top displayed first
1568 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1569 AV_FIELD_TB, //< Top coded first, bottom displayed first
1570 AV_FIELD_BT, //< Bottom coded first, top displayed first
1574 * main external API structure.
1575 * New fields can be added to the end with minor version bumps.
1576 * Removal, reordering and changes to existing fields require a major
1578 * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1580 * The name string for AVOptions options matches the associated command line
1581 * parameter name and can be found in libavcodec/options_table.h
1582 * The AVOption/command line parameter names differ in some cases from the C
1583 * structure field names for historic reasons or brevity.
1584 * sizeof(AVCodecContext) must not be used outside libav*.
1586 typedef struct AVCodecContext {
1588 * information on struct for av_log
1589 * - set by avcodec_alloc_context3
1591 const AVClass *av_class;
1592 int log_level_offset;
1594 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1595 const struct AVCodec *codec;
1596 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1599 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1600 * This is used to work around some encoder bugs.
1601 * A demuxer should set this to what is stored in the field used to identify the codec.
1602 * If there are multiple such fields in a container then the demuxer should choose the one
1603 * which maximizes the information about the used codec.
1604 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1605 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1606 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1608 * - encoding: Set by user, if not then the default based on codec_id will be used.
1609 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1611 unsigned int codec_tag;
1616 * Private context used for internal data.
1618 * Unlike priv_data, this is not codec-specific. It is used in general
1619 * libavcodec functions.
1621 struct AVCodecInternal *internal;
1624 * Private data of the user, can be used to carry app specific stuff.
1625 * - encoding: Set by user.
1626 * - decoding: Set by user.
1631 * the average bitrate
1632 * - encoding: Set by user; unused for constant quantizer encoding.
1633 * - decoding: Set by user, may be overwritten by libavcodec
1634 * if this info is available in the stream
1639 * number of bits the bitstream is allowed to diverge from the reference.
1640 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1641 * - encoding: Set by user; unused for constant quantizer encoding.
1642 * - decoding: unused
1644 int bit_rate_tolerance;
1647 * Global quality for codecs which cannot change it per frame.
1648 * This should be proportional to MPEG-1/2/4 qscale.
1649 * - encoding: Set by user.
1650 * - decoding: unused
1655 * - encoding: Set by user.
1656 * - decoding: unused
1658 int compression_level;
1659 #define FF_COMPRESSION_DEFAULT -1
1663 * - encoding: Set by user.
1664 * - decoding: Set by user.
1670 * - encoding: Set by user.
1671 * - decoding: Set by user.
1676 * some codecs need / can use extradata like Huffman tables.
1677 * MJPEG: Huffman tables
1678 * rv10: additional flags
1679 * MPEG-4: global headers (they can be in the bitstream or here)
1680 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1681 * than extradata_size to avoid problems if it is read with the bitstream reader.
1682 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1683 * Must be allocated with the av_malloc() family of functions.
1684 * - encoding: Set/allocated/freed by libavcodec.
1685 * - decoding: Set/allocated/freed by user.
1691 * This is the fundamental unit of time (in seconds) in terms
1692 * of which frame timestamps are represented. For fixed-fps content,
1693 * timebase should be 1/framerate and timestamp increments should be
1695 * This often, but not always is the inverse of the frame rate or field rate
1696 * for video. 1/time_base is not the average frame rate if the frame rate is not
1699 * Like containers, elementary streams also can store timestamps, 1/time_base
1700 * is the unit in which these timestamps are specified.
1701 * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1702 * vop_time_increment_resolution and fixed_vop_rate
1703 * (fixed_vop_rate == 0 implies that it is different from the framerate)
1705 * - encoding: MUST be set by user.
1706 * - decoding: the use of this field for decoding is deprecated.
1707 * Use framerate instead.
1709 AVRational time_base;
1712 * For some codecs, the time base is closer to the field rate than the frame rate.
1713 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1714 * if no telecine is used ...
1716 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1718 int ticks_per_frame;
1723 * Encoding: Number of frames delay there will be from the encoder input to
1724 * the decoder output. (we assume the decoder matches the spec)
1725 * Decoding: Number of frames delay in addition to what a standard decoder
1726 * as specified in the spec would produce.
1729 * Number of frames the decoded output will be delayed relative to the
1733 * For encoding, this field is unused (see initial_padding).
1735 * For decoding, this is the number of samples the decoder needs to
1736 * output before the decoder's output is valid. When seeking, you should
1737 * start decoding this many samples prior to your desired seek point.
1739 * - encoding: Set by libavcodec.
1740 * - decoding: Set by libavcodec.
1747 * picture width / height.
1749 * @note Those fields may not match the values of the last
1750 * AVFrame output by avcodec_decode_video2 due frame
1753 * - encoding: MUST be set by user.
1754 * - decoding: May be set by the user before opening the decoder if known e.g.
1755 * from the container. Some decoders will require the dimensions
1756 * to be set by the caller. During decoding, the decoder may
1757 * overwrite those values as required while parsing the data.
1762 * Bitstream width / height, may be different from width/height e.g. when
1763 * the decoded frame is cropped before being output or lowres is enabled.
1765 * @note Those field may not match the value of the last
1766 * AVFrame output by avcodec_receive_frame() due frame
1769 * - encoding: unused
1770 * - decoding: May be set by the user before opening the decoder if known
1771 * e.g. from the container. During decoding, the decoder may
1772 * overwrite those values as required while parsing the data.
1774 int coded_width, coded_height;
1777 * the number of pictures in a group of pictures, or 0 for intra_only
1778 * - encoding: Set by user.
1779 * - decoding: unused
1784 * Pixel format, see AV_PIX_FMT_xxx.
1785 * May be set by the demuxer if known from headers.
1786 * May be overridden by the decoder if it knows better.
1788 * @note This field may not match the value of the last
1789 * AVFrame output by avcodec_receive_frame() due frame
1792 * - encoding: Set by user.
1793 * - decoding: Set by user if known, overridden by libavcodec while
1796 enum AVPixelFormat pix_fmt;
1799 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1800 * decoder to draw a horizontal band. It improves cache usage. Not
1801 * all codecs can do that. You must check the codec capabilities
1803 * When multithreading is used, it may be called from multiple threads
1804 * at the same time; threads might draw different parts of the same AVFrame,
1805 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1807 * The function is also used by hardware acceleration APIs.
1808 * It is called at least once during frame decoding to pass
1809 * the data needed for hardware render.
1810 * In that mode instead of pixel data, AVFrame points to
1811 * a structure specific to the acceleration API. The application
1812 * reads the structure and can change some fields to indicate progress
1814 * - encoding: unused
1815 * - decoding: Set by user.
1816 * @param height the height of the slice
1817 * @param y the y position of the slice
1818 * @param type 1->top field, 2->bottom field, 3->frame
1819 * @param offset offset into the AVFrame.data from which the slice should be read
1821 void (*draw_horiz_band)(struct AVCodecContext *s,
1822 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1823 int y, int type, int height);
1826 * callback to negotiate the pixelFormat
1827 * @param fmt is the list of formats which are supported by the codec,
1828 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1829 * The first is always the native one.
1830 * @note The callback may be called again immediately if initialization for
1831 * the selected (hardware-accelerated) pixel format failed.
1832 * @warning Behavior is undefined if the callback returns a value not
1833 * in the fmt list of formats.
1834 * @return the chosen format
1835 * - encoding: unused
1836 * - decoding: Set by user, if not set the native format will be chosen.
1838 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1841 * maximum number of B-frames between non-B-frames
1842 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1843 * - encoding: Set by user.
1844 * - decoding: unused
1849 * qscale factor between IP and B-frames
1850 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1851 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1852 * - encoding: Set by user.
1853 * - decoding: unused
1855 float b_quant_factor;
1857 #if FF_API_PRIVATE_OPT
1858 /** @deprecated use encoder private options instead */
1859 attribute_deprecated
1860 int b_frame_strategy;
1864 * qscale offset between IP and B-frames
1865 * - encoding: Set by user.
1866 * - decoding: unused
1868 float b_quant_offset;
1871 * Size of the frame reordering buffer in the decoder.
1872 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1873 * - encoding: Set by libavcodec.
1874 * - decoding: Set by libavcodec.
1878 #if FF_API_PRIVATE_OPT
1879 /** @deprecated use encoder private options instead */
1880 attribute_deprecated
1885 * qscale factor between P- and I-frames
1886 * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
1887 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1888 * - encoding: Set by user.
1889 * - decoding: unused
1891 float i_quant_factor;
1894 * qscale offset between P and I-frames
1895 * - encoding: Set by user.
1896 * - decoding: unused
1898 float i_quant_offset;
1901 * luminance masking (0-> disabled)
1902 * - encoding: Set by user.
1903 * - decoding: unused
1908 * temporary complexity masking (0-> disabled)
1909 * - encoding: Set by user.
1910 * - decoding: unused
1912 float temporal_cplx_masking;
1915 * spatial complexity masking (0-> disabled)
1916 * - encoding: Set by user.
1917 * - decoding: unused
1919 float spatial_cplx_masking;
1922 * p block masking (0-> disabled)
1923 * - encoding: Set by user.
1924 * - decoding: unused
1929 * darkness masking (0-> disabled)
1930 * - encoding: Set by user.
1931 * - decoding: unused
1937 * - encoding: Set by libavcodec.
1938 * - decoding: Set by user (or 0).
1942 #if FF_API_PRIVATE_OPT
1943 /** @deprecated use encoder private options instead */
1944 attribute_deprecated
1945 int prediction_method;
1946 #define FF_PRED_LEFT 0
1947 #define FF_PRED_PLANE 1
1948 #define FF_PRED_MEDIAN 2
1952 * slice offsets in the frame in bytes
1953 * - encoding: Set/allocated by libavcodec.
1954 * - decoding: Set/allocated by user (or NULL).
1959 * sample aspect ratio (0 if unknown)
1960 * That is the width of a pixel divided by the height of the pixel.
1961 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1962 * - encoding: Set by user.
1963 * - decoding: Set by libavcodec.
1965 AVRational sample_aspect_ratio;
1968 * motion estimation comparison function
1969 * - encoding: Set by user.
1970 * - decoding: unused
1974 * subpixel motion estimation comparison function
1975 * - encoding: Set by user.
1976 * - decoding: unused
1980 * macroblock comparison function (not supported yet)
1981 * - encoding: Set by user.
1982 * - decoding: unused
1986 * interlaced DCT comparison function
1987 * - encoding: Set by user.
1988 * - decoding: unused
1991 #define FF_CMP_SAD 0
1992 #define FF_CMP_SSE 1
1993 #define FF_CMP_SATD 2
1994 #define FF_CMP_DCT 3
1995 #define FF_CMP_PSNR 4
1996 #define FF_CMP_BIT 5
1998 #define FF_CMP_ZERO 7
1999 #define FF_CMP_VSAD 8
2000 #define FF_CMP_VSSE 9
2001 #define FF_CMP_NSSE 10
2002 #define FF_CMP_W53 11
2003 #define FF_CMP_W97 12
2004 #define FF_CMP_DCTMAX 13
2005 #define FF_CMP_DCT264 14
2006 #define FF_CMP_MEDIAN_SAD 15
2007 #define FF_CMP_CHROMA 256
2010 * ME diamond size & shape
2011 * - encoding: Set by user.
2012 * - decoding: unused
2017 * amount of previous MV predictors (2a+1 x 2a+1 square)
2018 * - encoding: Set by user.
2019 * - decoding: unused
2021 int last_predictor_count;
2023 #if FF_API_PRIVATE_OPT
2024 /** @deprecated use encoder private options instead */
2025 attribute_deprecated
2030 * motion estimation prepass comparison function
2031 * - encoding: Set by user.
2032 * - decoding: unused
2037 * ME prepass diamond size & shape
2038 * - encoding: Set by user.
2039 * - decoding: unused
2045 * - encoding: Set by user.
2046 * - decoding: unused
2048 int me_subpel_quality;
2051 * maximum motion estimation search range in subpel units
2052 * If 0 then no limit.
2054 * - encoding: Set by user.
2055 * - decoding: unused
2061 * - encoding: unused
2062 * - decoding: Set by user.
2065 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2066 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
2067 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2070 * macroblock decision mode
2071 * - encoding: Set by user.
2072 * - decoding: unused
2075 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2076 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2077 #define FF_MB_DECISION_RD 2 ///< rate distortion
2080 * custom intra quantization matrix
2081 * Must be allocated with the av_malloc() family of functions, and will be freed in
2082 * avcodec_free_context().
2083 * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
2084 * - decoding: Set/allocated/freed by libavcodec.
2086 uint16_t *intra_matrix;
2089 * custom inter quantization matrix
2090 * Must be allocated with the av_malloc() family of functions, and will be freed in
2091 * avcodec_free_context().
2092 * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
2093 * - decoding: Set/allocated/freed by libavcodec.
2095 uint16_t *inter_matrix;
2097 #if FF_API_PRIVATE_OPT
2098 /** @deprecated use encoder private options instead */
2099 attribute_deprecated
2100 int scenechange_threshold;
2102 /** @deprecated use encoder private options instead */
2103 attribute_deprecated
2104 int noise_reduction;
2108 * precision of the intra DC coefficient - 8
2109 * - encoding: Set by user.
2110 * - decoding: Set by libavcodec
2112 int intra_dc_precision;
2115 * Number of macroblock rows at the top which are skipped.
2116 * - encoding: unused
2117 * - decoding: Set by user.
2122 * Number of macroblock rows at the bottom which are skipped.
2123 * - encoding: unused
2124 * - decoding: Set by user.
2129 * minimum MB Lagrange multiplier
2130 * - encoding: Set by user.
2131 * - decoding: unused
2136 * maximum MB Lagrange multiplier
2137 * - encoding: Set by user.
2138 * - decoding: unused
2142 #if FF_API_PRIVATE_OPT
2144 * @deprecated use encoder private options instead
2146 attribute_deprecated
2147 int me_penalty_compensation;
2151 * - encoding: Set by user.
2152 * - decoding: unused
2156 #if FF_API_PRIVATE_OPT
2157 /** @deprecated use encoder private options instead */
2158 attribute_deprecated
2164 * - encoding: Set by user.
2165 * - decoding: unused
2170 * number of reference frames
2171 * - encoding: Set by user.
2172 * - decoding: Set by lavc.
2176 #if FF_API_PRIVATE_OPT
2177 /** @deprecated use encoder private options instead */
2178 attribute_deprecated
2183 * Note: Value depends upon the compare function used for fullpel ME.
2184 * - encoding: Set by user.
2185 * - decoding: unused
2189 #if FF_API_PRIVATE_OPT
2190 /** @deprecated use encoder private options instead */
2191 attribute_deprecated
2196 * Chromaticity coordinates of the source primaries.
2197 * - encoding: Set by user
2198 * - decoding: Set by libavcodec
2200 enum AVColorPrimaries color_primaries;
2203 * Color Transfer Characteristic.
2204 * - encoding: Set by user
2205 * - decoding: Set by libavcodec
2207 enum AVColorTransferCharacteristic color_trc;
2210 * YUV colorspace type.
2211 * - encoding: Set by user
2212 * - decoding: Set by libavcodec
2214 enum AVColorSpace colorspace;
2217 * MPEG vs JPEG YUV range.
2218 * - encoding: Set by user
2219 * - decoding: Set by libavcodec
2221 enum AVColorRange color_range;
2224 * This defines the location of chroma samples.
2225 * - encoding: Set by user
2226 * - decoding: Set by libavcodec
2228 enum AVChromaLocation chroma_sample_location;
2232 * Indicates number of picture subdivisions. Used for parallelized
2234 * - encoding: Set by user
2235 * - decoding: unused
2240 * - encoding: set by libavcodec
2241 * - decoding: Set by user.
2243 enum AVFieldOrder field_order;
2246 int sample_rate; ///< samples per second
2247 int channels; ///< number of audio channels
2250 * audio sample format
2251 * - encoding: Set by user.
2252 * - decoding: Set by libavcodec.
2254 enum AVSampleFormat sample_fmt; ///< sample format
2256 /* The following data should not be initialized. */
2258 * Number of samples per channel in an audio frame.
2260 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2261 * except the last must contain exactly frame_size samples per channel.
2262 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2263 * frame size is not restricted.
2264 * - decoding: may be set by some decoders to indicate constant frame size
2269 * Frame counter, set by libavcodec.
2271 * - decoding: total number of frames returned from the decoder so far.
2272 * - encoding: total number of frames passed to the encoder so far.
2274 * @note the counter is not incremented if encoding/decoding resulted in
2280 * number of bytes per packet if constant and known or 0
2281 * Used by some WAV based audio codecs.
2286 * Audio cutoff bandwidth (0 means "automatic")
2287 * - encoding: Set by user.
2288 * - decoding: unused
2293 * Audio channel layout.
2294 * - encoding: set by user.
2295 * - decoding: set by user, may be overwritten by libavcodec.
2297 uint64_t channel_layout;
2300 * Request decoder to use this channel layout if it can (0 for default)
2301 * - encoding: unused
2302 * - decoding: Set by user.
2304 uint64_t request_channel_layout;
2307 * Type of service that the audio stream conveys.
2308 * - encoding: Set by user.
2309 * - decoding: Set by libavcodec.
2311 enum AVAudioServiceType audio_service_type;
2314 * desired sample format
2315 * - encoding: Not used.
2316 * - decoding: Set by user.
2317 * Decoder will decode to this format if it can.
2319 enum AVSampleFormat request_sample_fmt;
2322 * This callback is called at the beginning of each frame to get data
2323 * buffer(s) for it. There may be one contiguous buffer for all the data or
2324 * there may be a buffer per each data plane or anything in between. What
2325 * this means is, you may set however many entries in buf[] you feel necessary.
2326 * Each buffer must be reference-counted using the AVBuffer API (see description
2329 * The following fields will be set in the frame before this callback is
2332 * - width, height (video only)
2333 * - sample_rate, channel_layout, nb_samples (audio only)
2334 * Their values may differ from the corresponding values in
2335 * AVCodecContext. This callback must use the frame values, not the codec
2336 * context values, to calculate the required buffer size.
2338 * This callback must fill the following fields in the frame:
2342 * * if the data is planar audio with more than 8 channels, then this
2343 * callback must allocate and fill extended_data to contain all pointers
2344 * to all data planes. data[] must hold as many pointers as it can.
2345 * extended_data must be allocated with av_malloc() and will be freed in
2347 * * otherwise extended_data must point to data
2348 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2349 * the frame's data and extended_data pointers must be contained in these. That
2350 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2351 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2352 * and av_buffer_ref().
2353 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2354 * this callback and filled with the extra buffers if there are more
2355 * buffers than buf[] can hold. extended_buf will be freed in
2358 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2359 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2362 * Each data plane must be aligned to the maximum required by the target
2365 * @see avcodec_default_get_buffer2()
2369 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2370 * (read and/or written to if it is writable) later by libavcodec.
2372 * avcodec_align_dimensions2() should be used to find the required width and
2373 * height, as they normally need to be rounded up to the next multiple of 16.
2375 * Some decoders do not support linesizes changing between frames.
2377 * If frame multithreading is used and thread_safe_callbacks is set,
2378 * this callback may be called from a different thread, but not from more
2379 * than one at once. Does not need to be reentrant.
2381 * @see avcodec_align_dimensions2()
2385 * Decoders request a buffer of a particular size by setting
2386 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2387 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2388 * to a smaller value in the output frame.
2390 * As a convenience, av_samples_get_buffer_size() and
2391 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2392 * functions to find the required data size and to fill data pointers and
2393 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2394 * since all planes must be the same size.
2396 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2398 * - encoding: unused
2399 * - decoding: Set by libavcodec, user can override.
2401 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2404 * If non-zero, the decoded audio and video frames returned from
2405 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2406 * and are valid indefinitely. The caller must free them with
2407 * av_frame_unref() when they are not needed anymore.
2408 * Otherwise, the decoded frames must not be freed by the caller and are
2409 * only valid until the next decode call.
2411 * This is always automatically enabled if avcodec_receive_frame() is used.
2413 * - encoding: unused
2414 * - decoding: set by the caller before avcodec_open2().
2416 attribute_deprecated
2417 int refcounted_frames;
2419 /* - encoding parameters */
2420 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2421 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2425 * - encoding: Set by user.
2426 * - decoding: unused
2432 * - encoding: Set by user.
2433 * - decoding: unused
2438 * maximum quantizer difference between frames
2439 * - encoding: Set by user.
2440 * - decoding: unused
2445 * decoder bitstream buffer size
2446 * - encoding: Set by user.
2447 * - decoding: unused
2452 * ratecontrol override, see RcOverride
2453 * - encoding: Allocated/set/freed by user.
2454 * - decoding: unused
2456 int rc_override_count;
2457 RcOverride *rc_override;
2461 * - encoding: Set by user.
2462 * - decoding: Set by user, may be overwritten by libavcodec.
2464 int64_t rc_max_rate;
2468 * - encoding: Set by user.
2469 * - decoding: unused
2471 int64_t rc_min_rate;
2474 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2475 * - encoding: Set by user.
2476 * - decoding: unused.
2478 float rc_max_available_vbv_use;
2481 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2482 * - encoding: Set by user.
2483 * - decoding: unused.
2485 float rc_min_vbv_overflow_use;
2488 * Number of bits which should be loaded into the rc buffer before decoding starts.
2489 * - encoding: Set by user.
2490 * - decoding: unused
2492 int rc_initial_buffer_occupancy;
2494 #if FF_API_CODER_TYPE
2495 #define FF_CODER_TYPE_VLC 0
2496 #define FF_CODER_TYPE_AC 1
2497 #define FF_CODER_TYPE_RAW 2
2498 #define FF_CODER_TYPE_RLE 3
2500 * @deprecated use encoder private options instead
2502 attribute_deprecated
2504 #endif /* FF_API_CODER_TYPE */
2506 #if FF_API_PRIVATE_OPT
2507 /** @deprecated use encoder private options instead */
2508 attribute_deprecated
2512 #if FF_API_PRIVATE_OPT
2513 /** @deprecated use encoder private options instead */
2514 attribute_deprecated
2515 int frame_skip_threshold;
2517 /** @deprecated use encoder private options instead */
2518 attribute_deprecated
2519 int frame_skip_factor;
2521 /** @deprecated use encoder private options instead */
2522 attribute_deprecated
2525 /** @deprecated use encoder private options instead */
2526 attribute_deprecated
2528 #endif /* FF_API_PRIVATE_OPT */
2531 * trellis RD quantization
2532 * - encoding: Set by user.
2533 * - decoding: unused
2537 #if FF_API_PRIVATE_OPT
2538 /** @deprecated use encoder private options instead */
2539 attribute_deprecated
2540 int min_prediction_order;
2542 /** @deprecated use encoder private options instead */
2543 attribute_deprecated
2544 int max_prediction_order;
2546 /** @deprecated use encoder private options instead */
2547 attribute_deprecated
2548 int64_t timecode_frame_start;
2551 #if FF_API_RTP_CALLBACK
2553 * @deprecated unused
2555 /* The RTP callback: This function is called */
2556 /* every time the encoder has a packet to send. */
2557 /* It depends on the encoder if the data starts */
2558 /* with a Start Code (it should). H.263 does. */
2559 /* mb_nb contains the number of macroblocks */
2560 /* encoded in the RTP payload. */
2561 attribute_deprecated
2562 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2565 #if FF_API_PRIVATE_OPT
2566 /** @deprecated use encoder private options instead */
2567 attribute_deprecated
2568 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2569 /* do its best to deliver a chunk with size */
2570 /* below rtp_payload_size, the chunk will start */
2571 /* with a start code on some codecs like H.263. */
2572 /* This doesn't take account of any particular */
2573 /* headers inside the transmitted RTP payload. */
2576 #if FF_API_STAT_BITS
2577 /* statistics, used for 2-pass encoding */
2578 attribute_deprecated
2580 attribute_deprecated
2582 attribute_deprecated
2584 attribute_deprecated
2586 attribute_deprecated
2588 attribute_deprecated
2590 attribute_deprecated
2592 attribute_deprecated
2595 /** @deprecated this field is unused */
2596 attribute_deprecated
2601 * pass1 encoding statistics output buffer
2602 * - encoding: Set by libavcodec.
2603 * - decoding: unused
2608 * pass2 encoding statistics input buffer
2609 * Concatenated stuff from stats_out of pass1 should be placed here.
2610 * - encoding: Allocated/set/freed by user.
2611 * - decoding: unused
2616 * Work around bugs in encoders which sometimes cannot be detected automatically.
2617 * - encoding: Set by user
2618 * - decoding: Set by user
2620 int workaround_bugs;
2621 #define FF_BUG_AUTODETECT 1 ///< autodetection
2622 #define FF_BUG_XVID_ILACE 4
2623 #define FF_BUG_UMP4 8
2624 #define FF_BUG_NO_PADDING 16
2625 #define FF_BUG_AMV 32
2626 #define FF_BUG_QPEL_CHROMA 64
2627 #define FF_BUG_STD_QPEL 128
2628 #define FF_BUG_QPEL_CHROMA2 256
2629 #define FF_BUG_DIRECT_BLOCKSIZE 512
2630 #define FF_BUG_EDGE 1024
2631 #define FF_BUG_HPEL_CHROMA 2048
2632 #define FF_BUG_DC_CLIP 4096
2633 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2634 #define FF_BUG_TRUNCATED 16384
2635 #define FF_BUG_IEDGE 32768
2638 * strictly follow the standard (MPEG-4, ...).
2639 * - encoding: Set by user.
2640 * - decoding: Set by user.
2641 * Setting this to STRICT or higher means the encoder and decoder will
2642 * generally do stupid things, whereas setting it to unofficial or lower
2643 * will mean the encoder might produce output that is not supported by all
2644 * spec-compliant decoders. Decoders don't differentiate between normal,
2645 * unofficial and experimental (that is, they always try to decode things
2646 * when they can) unless they are explicitly asked to behave stupidly
2647 * (=strictly conform to the specs)
2649 int strict_std_compliance;
2650 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2651 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2652 #define FF_COMPLIANCE_NORMAL 0
2653 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2654 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2657 * error concealment flags
2658 * - encoding: unused
2659 * - decoding: Set by user.
2661 int error_concealment;
2662 #define FF_EC_GUESS_MVS 1
2663 #define FF_EC_DEBLOCK 2
2664 #define FF_EC_FAVOR_INTER 256
2668 * - encoding: Set by user.
2669 * - decoding: Set by user.
2672 #define FF_DEBUG_PICT_INFO 1
2673 #define FF_DEBUG_RC 2
2674 #define FF_DEBUG_BITSTREAM 4
2675 #define FF_DEBUG_MB_TYPE 8
2676 #define FF_DEBUG_QP 16
2679 * @deprecated this option does nothing
2681 #define FF_DEBUG_MV 32
2683 #define FF_DEBUG_DCT_COEFF 0x00000040
2684 #define FF_DEBUG_SKIP 0x00000080
2685 #define FF_DEBUG_STARTCODE 0x00000100
2686 #define FF_DEBUG_ER 0x00000400
2687 #define FF_DEBUG_MMCO 0x00000800
2688 #define FF_DEBUG_BUGS 0x00001000
2690 #define FF_DEBUG_VIS_QP 0x00002000
2691 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2693 #define FF_DEBUG_BUFFERS 0x00008000
2694 #define FF_DEBUG_THREADS 0x00010000
2695 #define FF_DEBUG_GREEN_MD 0x00800000
2696 #define FF_DEBUG_NOMC 0x01000000
2701 * - encoding: Set by user.
2702 * - decoding: Set by user.
2705 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
2706 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
2707 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
2711 * Error recognition; may misdetect some more or less valid parts as errors.
2712 * - encoding: unused
2713 * - decoding: Set by user.
2715 int err_recognition;
2718 * Verify checksums embedded in the bitstream (could be of either encoded or
2719 * decoded data, depending on the codec) and print an error message on mismatch.
2720 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2721 * decoder returning an error.
2723 #define AV_EF_CRCCHECK (1<<0)
2724 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2725 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2726 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2728 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2729 #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
2730 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2731 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2735 * opaque 64-bit number (generally a PTS) that will be reordered and
2736 * output in AVFrame.reordered_opaque
2737 * - encoding: Set by libavcodec to the reordered_opaque of the input
2738 * frame corresponding to the last returned packet. Only
2739 * supported by encoders with the
2740 * AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability.
2741 * - decoding: Set by user.
2743 int64_t reordered_opaque;
2746 * Hardware accelerator in use
2747 * - encoding: unused.
2748 * - decoding: Set by libavcodec
2750 const struct AVHWAccel *hwaccel;
2753 * Hardware accelerator context.
2754 * For some hardware accelerators, a global context needs to be
2755 * provided by the user. In that case, this holds display-dependent
2756 * data FFmpeg cannot instantiate itself. Please refer to the
2757 * FFmpeg HW accelerator documentation to know how to fill this
2758 * is. e.g. for VA API, this is a struct vaapi_context.
2759 * - encoding: unused
2760 * - decoding: Set by user
2762 void *hwaccel_context;
2766 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2767 * - decoding: unused
2769 uint64_t error[AV_NUM_DATA_POINTERS];
2772 * DCT algorithm, see FF_DCT_* below
2773 * - encoding: Set by user.
2774 * - decoding: unused
2777 #define FF_DCT_AUTO 0
2778 #define FF_DCT_FASTINT 1
2779 #define FF_DCT_INT 2
2780 #define FF_DCT_MMX 3
2781 #define FF_DCT_ALTIVEC 5
2782 #define FF_DCT_FAAN 6
2785 * IDCT algorithm, see FF_IDCT_* below.
2786 * - encoding: Set by user.
2787 * - decoding: Set by user.
2790 #define FF_IDCT_AUTO 0
2791 #define FF_IDCT_INT 1
2792 #define FF_IDCT_SIMPLE 2
2793 #define FF_IDCT_SIMPLEMMX 3
2794 #define FF_IDCT_ARM 7
2795 #define FF_IDCT_ALTIVEC 8
2796 #define FF_IDCT_SIMPLEARM 10
2797 #define FF_IDCT_XVID 14
2798 #define FF_IDCT_SIMPLEARMV5TE 16
2799 #define FF_IDCT_SIMPLEARMV6 17
2800 #define FF_IDCT_FAAN 20
2801 #define FF_IDCT_SIMPLENEON 22
2802 #define FF_IDCT_NONE 24 /* Used by XvMC to extract IDCT coefficients with FF_IDCT_PERM_NONE */
2803 #define FF_IDCT_SIMPLEAUTO 128
2806 * bits per sample/pixel from the demuxer (needed for huffyuv).
2807 * - encoding: Set by libavcodec.
2808 * - decoding: Set by user.
2810 int bits_per_coded_sample;
2813 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2814 * - encoding: set by user.
2815 * - decoding: set by libavcodec.
2817 int bits_per_raw_sample;
2821 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2822 * - encoding: unused
2823 * - decoding: Set by user.
2828 #if FF_API_CODED_FRAME
2830 * the picture in the bitstream
2831 * - encoding: Set by libavcodec.
2832 * - decoding: unused
2834 * @deprecated use the quality factor packet side data instead
2836 attribute_deprecated AVFrame *coded_frame;
2841 * is used to decide how many independent tasks should be passed to execute()
2842 * - encoding: Set by user.
2843 * - decoding: Set by user.
2848 * Which multithreading methods to use.
2849 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2850 * so clients which cannot provide future frames should not use it.
2852 * - encoding: Set by user, otherwise the default is used.
2853 * - decoding: Set by user, otherwise the default is used.
2856 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2857 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2860 * Which multithreading methods are in use by the codec.
2861 * - encoding: Set by libavcodec.
2862 * - decoding: Set by libavcodec.
2864 int active_thread_type;
2867 * Set by the client if its custom get_buffer() callback can be called
2868 * synchronously from another thread, which allows faster multithreaded decoding.
2869 * draw_horiz_band() will be called from other threads regardless of this setting.
2870 * Ignored if the default get_buffer() is used.
2871 * - encoding: Set by user.
2872 * - decoding: Set by user.
2874 int thread_safe_callbacks;
2877 * The codec may call this to execute several independent things.
2878 * It will return only after finishing all tasks.
2879 * The user may replace this with some multithreaded implementation,
2880 * the default implementation will execute the parts serially.
2881 * @param count the number of things to execute
2882 * - encoding: Set by libavcodec, user can override.
2883 * - decoding: Set by libavcodec, user can override.
2885 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2888 * The codec may call this to execute several independent things.
2889 * It will return only after finishing all tasks.
2890 * The user may replace this with some multithreaded implementation,
2891 * the default implementation will execute the parts serially.
2892 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2893 * @param c context passed also to func
2894 * @param count the number of things to execute
2895 * @param arg2 argument passed unchanged to func
2896 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2897 * @param func function that will be called count times, with jobnr from 0 to count-1.
2898 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2899 * two instances of func executing at the same time will have the same threadnr.
2900 * @return always 0 currently, but code should handle a future improvement where when any call to func
2901 * returns < 0 no further calls to func may be done and < 0 is returned.
2902 * - encoding: Set by libavcodec, user can override.
2903 * - decoding: Set by libavcodec, user can override.
2905 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2908 * noise vs. sse weight for the nsse comparison function
2909 * - encoding: Set by user.
2910 * - decoding: unused
2916 * - encoding: Set by user.
2917 * - decoding: Set by libavcodec.
2920 #define FF_PROFILE_UNKNOWN -99
2921 #define FF_PROFILE_RESERVED -100
2923 #define FF_PROFILE_AAC_MAIN 0
2924 #define FF_PROFILE_AAC_LOW 1
2925 #define FF_PROFILE_AAC_SSR 2
2926 #define FF_PROFILE_AAC_LTP 3
2927 #define FF_PROFILE_AAC_HE 4
2928 #define FF_PROFILE_AAC_HE_V2 28
2929 #define FF_PROFILE_AAC_LD 22
2930 #define FF_PROFILE_AAC_ELD 38
2931 #define FF_PROFILE_MPEG2_AAC_LOW 128
2932 #define FF_PROFILE_MPEG2_AAC_HE 131
2934 #define FF_PROFILE_DNXHD 0
2935 #define FF_PROFILE_DNXHR_LB 1
2936 #define FF_PROFILE_DNXHR_SQ 2
2937 #define FF_PROFILE_DNXHR_HQ 3
2938 #define FF_PROFILE_DNXHR_HQX 4
2939 #define FF_PROFILE_DNXHR_444 5
2941 #define FF_PROFILE_DTS 20
2942 #define FF_PROFILE_DTS_ES 30
2943 #define FF_PROFILE_DTS_96_24 40
2944 #define FF_PROFILE_DTS_HD_HRA 50
2945 #define FF_PROFILE_DTS_HD_MA 60
2946 #define FF_PROFILE_DTS_EXPRESS 70
2948 #define FF_PROFILE_MPEG2_422 0
2949 #define FF_PROFILE_MPEG2_HIGH 1
2950 #define FF_PROFILE_MPEG2_SS 2
2951 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2952 #define FF_PROFILE_MPEG2_MAIN 4
2953 #define FF_PROFILE_MPEG2_SIMPLE 5
2955 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2956 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2958 #define FF_PROFILE_H264_BASELINE 66
2959 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2960 #define FF_PROFILE_H264_MAIN 77
2961 #define FF_PROFILE_H264_EXTENDED 88
2962 #define FF_PROFILE_H264_HIGH 100
2963 #define FF_PROFILE_H264_HIGH_10 110
2964 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2965 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
2966 #define FF_PROFILE_H264_HIGH_422 122
2967 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2968 #define FF_PROFILE_H264_STEREO_HIGH 128
2969 #define FF_PROFILE_H264_HIGH_444 144
2970 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2971 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2972 #define FF_PROFILE_H264_CAVLC_444 44
2974 #define FF_PROFILE_VC1_SIMPLE 0
2975 #define FF_PROFILE_VC1_MAIN 1
2976 #define FF_PROFILE_VC1_COMPLEX 2
2977 #define FF_PROFILE_VC1_ADVANCED 3
2979 #define FF_PROFILE_MPEG4_SIMPLE 0
2980 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2981 #define FF_PROFILE_MPEG4_CORE 2
2982 #define FF_PROFILE_MPEG4_MAIN 3
2983 #define FF_PROFILE_MPEG4_N_BIT 4
2984 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2985 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2986 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2987 #define FF_PROFILE_MPEG4_HYBRID 8
2988 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2989 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2990 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2991 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2992 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2993 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2994 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2996 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
2997 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
2998 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
2999 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3000 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3002 #define FF_PROFILE_VP9_0 0
3003 #define FF_PROFILE_VP9_1 1
3004 #define FF_PROFILE_VP9_2 2
3005 #define FF_PROFILE_VP9_3 3
3007 #define FF_PROFILE_HEVC_MAIN 1
3008 #define FF_PROFILE_HEVC_MAIN_10 2
3009 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3010 #define FF_PROFILE_HEVC_REXT 4
3012 #define FF_PROFILE_AV1_MAIN 0
3013 #define FF_PROFILE_AV1_HIGH 1
3014 #define FF_PROFILE_AV1_PROFESSIONAL 2
3016 #define FF_PROFILE_MJPEG_HUFFMAN_BASELINE_DCT 0xc0
3017 #define FF_PROFILE_MJPEG_HUFFMAN_EXTENDED_SEQUENTIAL_DCT 0xc1
3018 #define FF_PROFILE_MJPEG_HUFFMAN_PROGRESSIVE_DCT 0xc2
3019 #define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
3020 #define FF_PROFILE_MJPEG_JPEG_LS 0xf7
3022 #define FF_PROFILE_SBC_MSBC 1
3024 #define FF_PROFILE_PRORES_PROXY 0
3025 #define FF_PROFILE_PRORES_LT 1
3026 #define FF_PROFILE_PRORES_STANDARD 2
3027 #define FF_PROFILE_PRORES_HQ 3
3028 #define FF_PROFILE_PRORES_4444 4
3029 #define FF_PROFILE_PRORES_XQ 5
3031 #define FF_PROFILE_ARIB_PROFILE_A 0
3032 #define FF_PROFILE_ARIB_PROFILE_C 1
3036 * - encoding: Set by user.
3037 * - decoding: Set by libavcodec.
3040 #define FF_LEVEL_UNKNOWN -99
3043 * Skip loop filtering for selected frames.
3044 * - encoding: unused
3045 * - decoding: Set by user.
3047 enum AVDiscard skip_loop_filter;
3050 * Skip IDCT/dequantization for selected frames.
3051 * - encoding: unused
3052 * - decoding: Set by user.
3054 enum AVDiscard skip_idct;
3057 * Skip decoding for selected frames.
3058 * - encoding: unused
3059 * - decoding: Set by user.
3061 enum AVDiscard skip_frame;
3064 * Header containing style information for text subtitles.
3065 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3066 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3067 * the Format line following. It shouldn't include any Dialogue line.
3068 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3069 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3071 uint8_t *subtitle_header;
3072 int subtitle_header_size;
3074 #if FF_API_VBV_DELAY
3076 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3077 * Used for compliant TS muxing.
3078 * - encoding: Set by libavcodec.
3079 * - decoding: unused.
3080 * @deprecated this value is now exported as a part of
3081 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3083 attribute_deprecated
3087 #if FF_API_SIDEDATA_ONLY_PKT
3089 * Encoding only and set by default. Allow encoders to output packets
3090 * that do not contain any encoded data, only side data.
3092 * Some encoders need to output such packets, e.g. to update some stream
3093 * parameters at the end of encoding.
3095 * @deprecated this field disables the default behaviour and
3096 * it is kept only for compatibility.
3098 attribute_deprecated
3099 int side_data_only_packets;
3103 * Audio only. The number of "priming" samples (padding) inserted by the
3104 * encoder at the beginning of the audio. I.e. this number of leading
3105 * decoded samples must be discarded by the caller to get the original audio
3106 * without leading padding.
3108 * - decoding: unused
3109 * - encoding: Set by libavcodec. The timestamps on the output packets are
3110 * adjusted by the encoder so that they always refer to the
3111 * first sample of the data actually contained in the packet,
3112 * including any added padding. E.g. if the timebase is
3113 * 1/samplerate and the timestamp of the first input sample is
3114 * 0, the timestamp of the first output packet will be
3117 int initial_padding;
3120 * - decoding: For codecs that store a framerate value in the compressed
3121 * bitstream, the decoder may export it here. { 0, 1} when
3123 * - encoding: May be used to signal the framerate of CFR content to an
3126 AVRational framerate;
3129 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3130 * - encoding: unused.
3131 * - decoding: Set by libavcodec before calling get_format()
3133 enum AVPixelFormat sw_pix_fmt;
3136 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3137 * - encoding unused.
3138 * - decoding set by user.
3140 AVRational pkt_timebase;
3144 * - encoding: unused.
3145 * - decoding: set by libavcodec.
3147 const AVCodecDescriptor *codec_descriptor;
3151 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3152 * - encoding: unused
3153 * - decoding: Set by user.
3159 * Current statistics for PTS correction.
3160 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3161 * - encoding: unused
3163 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3164 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3165 int64_t pts_correction_last_pts; /// PTS of the last frame
3166 int64_t pts_correction_last_dts; /// DTS of the last frame
3169 * Character encoding of the input subtitles file.
3170 * - decoding: set by user
3171 * - encoding: unused
3176 * Subtitles character encoding mode. Formats or codecs might be adjusting
3177 * this setting (if they are doing the conversion themselves for instance).
3178 * - decoding: set by libavcodec
3179 * - encoding: unused
3181 int sub_charenc_mode;
3182 #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)
3183 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3184 #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
3185 #define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for valid UTF-8
3188 * Skip processing alpha if supported by codec.
3189 * Note that if the format uses pre-multiplied alpha (common with VP6,
3190 * and recommended due to better video quality/compression)
3191 * the image will look as if alpha-blended onto a black background.
3192 * However for formats that do not use pre-multiplied alpha
3193 * there might be serious artefacts (though e.g. libswscale currently
3194 * assumes pre-multiplied alpha anyway).
3196 * - decoding: set by user
3197 * - encoding: unused
3202 * Number of samples to skip after a discontinuity
3203 * - decoding: unused
3204 * - encoding: set by libavcodec
3208 #if !FF_API_DEBUG_MV
3210 * debug motion vectors
3211 * - encoding: Set by user.
3212 * - decoding: Set by user.
3215 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3216 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3217 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3221 * custom intra quantization matrix
3222 * - encoding: Set by user, can be NULL.
3223 * - decoding: unused.
3225 uint16_t *chroma_intra_matrix;
3228 * dump format separator.
3229 * can be ", " or "\n " or anything else
3230 * - encoding: Set by user.
3231 * - decoding: Set by user.
3233 uint8_t *dump_separator;
3236 * ',' separated list of allowed decoders.
3237 * If NULL then all are allowed
3238 * - encoding: unused
3239 * - decoding: set by user
3241 char *codec_whitelist;
3244 * Properties of the stream that gets decoded
3245 * - encoding: unused
3246 * - decoding: set by libavcodec
3248 unsigned properties;
3249 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3250 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3253 * Additional data associated with the entire coded stream.
3255 * - decoding: unused
3256 * - encoding: may be set by libavcodec after avcodec_open2().
3258 AVPacketSideData *coded_side_data;
3259 int nb_coded_side_data;
3262 * A reference to the AVHWFramesContext describing the input (for encoding)
3263 * or output (decoding) frames. The reference is set by the caller and
3264 * afterwards owned (and freed) by libavcodec - it should never be read by
3265 * the caller after being set.
3267 * - decoding: This field should be set by the caller from the get_format()
3268 * callback. The previous reference (if any) will always be
3269 * unreffed by libavcodec before the get_format() call.
3271 * If the default get_buffer2() is used with a hwaccel pixel
3272 * format, then this AVHWFramesContext will be used for
3273 * allocating the frame buffers.
3275 * - encoding: For hardware encoders configured to use a hwaccel pixel
3276 * format, this field should be set by the caller to a reference
3277 * to the AVHWFramesContext describing input frames.
3278 * AVHWFramesContext.format must be equal to
3279 * AVCodecContext.pix_fmt.
3281 * This field should be set before avcodec_open2() is called.
3283 AVBufferRef *hw_frames_ctx;
3286 * Control the form of AVSubtitle.rects[N]->ass
3287 * - decoding: set by user
3288 * - encoding: unused
3290 int sub_text_format;
3291 #define FF_SUB_TEXT_FMT_ASS 0
3292 #if FF_API_ASS_TIMING
3293 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3297 * Audio only. The amount of padding (in samples) appended by the encoder to
3298 * the end of the audio. I.e. this number of decoded samples must be
3299 * discarded by the caller from the end of the stream to get the original
3300 * audio without any trailing padding.
3302 * - decoding: unused
3303 * - encoding: unused
3305 int trailing_padding;
3308 * The number of pixels per image to maximally accept.
3310 * - decoding: set by user
3311 * - encoding: set by user
3316 * A reference to the AVHWDeviceContext describing the device which will
3317 * be used by a hardware encoder/decoder. The reference is set by the
3318 * caller and afterwards owned (and freed) by libavcodec.
3320 * This should be used if either the codec device does not require
3321 * hardware frames or any that are used are to be allocated internally by
3322 * libavcodec. If the user wishes to supply any of the frames used as
3323 * encoder input or decoder output then hw_frames_ctx should be used
3324 * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3325 * field will be ignored while decoding the associated stream segment, but
3326 * may again be used on a following one after another get_format() call.
3328 * For both encoders and decoders this field should be set before
3329 * avcodec_open2() is called and must not be written to thereafter.
3331 * Note that some decoders may require this field to be set initially in
3332 * order to support hw_frames_ctx at all - in that case, all frames
3333 * contexts used must be created on the same device.
3335 AVBufferRef *hw_device_ctx;
3338 * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3339 * decoding (if active).
3340 * - encoding: unused
3341 * - decoding: Set by user (either before avcodec_open2(), or in the
3342 * AVCodecContext.get_format callback)
3347 * Video decoding only. Certain video codecs support cropping, meaning that
3348 * only a sub-rectangle of the decoded frame is intended for display. This
3349 * option controls how cropping is handled by libavcodec.
3351 * When set to 1 (the default), libavcodec will apply cropping internally.
3352 * I.e. it will modify the output frame width/height fields and offset the
3353 * data pointers (only by as much as possible while preserving alignment, or
3354 * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3355 * the frames output by the decoder refer only to the cropped area. The
3356 * crop_* fields of the output frames will be zero.
3358 * When set to 0, the width/height fields of the output frames will be set
3359 * to the coded dimensions and the crop_* fields will describe the cropping
3360 * rectangle. Applying the cropping is left to the caller.
3362 * @warning When hardware acceleration with opaque output frames is used,
3363 * libavcodec is unable to apply cropping from the top/left border.
3365 * @note when this option is set to zero, the width/height fields of the
3366 * AVCodecContext and output AVFrames have different meanings. The codec
3367 * context fields store display dimensions (with the coded dimensions in
3368 * coded_width/height), while the frame fields store the coded dimensions
3369 * (with the display dimensions being determined by the crop_* fields).
3374 * Video decoding only. Sets the number of extra hardware frames which
3375 * the decoder will allocate for use by the caller. This must be set
3376 * before avcodec_open2() is called.
3378 * Some hardware decoders require all frames that they will use for
3379 * output to be defined in advance before decoding starts. For such
3380 * decoders, the hardware frame pool must therefore be of a fixed size.
3381 * The extra frames set here are on top of any number that the decoder
3382 * needs internally in order to operate normally (for example, frames
3383 * used as reference pictures).
3385 int extra_hw_frames;
3388 * The percentage of damaged samples to discard a frame.
3390 * - decoding: set by user
3391 * - encoding: unused
3393 int discard_damaged_percentage;
3396 * The number of samples per frame to maximally accept.
3398 * - decoding: set by user
3399 * - encoding: set by user
3401 int64_t max_samples;
3404 #if FF_API_CODEC_GET_SET
3406 * Accessors for some AVCodecContext fields. These used to be provided for ABI
3407 * compatibility, and do not need to be used anymore.
3409 attribute_deprecated
3410 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3411 attribute_deprecated
3412 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3414 attribute_deprecated
3415 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3416 attribute_deprecated
3417 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3419 attribute_deprecated
3420 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3423 attribute_deprecated
3424 int av_codec_get_lowres(const AVCodecContext *avctx);
3425 attribute_deprecated
3426 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3429 attribute_deprecated
3430 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3431 attribute_deprecated
3432 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3434 attribute_deprecated
3435 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3436 attribute_deprecated
3437 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3443 typedef struct AVProfile {
3445 const char *name; ///< short name for the profile
3450 * The codec supports this format via the hw_device_ctx interface.
3452 * When selecting this format, AVCodecContext.hw_device_ctx should
3453 * have been set to a device of the specified type before calling
3456 AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX = 0x01,
3458 * The codec supports this format via the hw_frames_ctx interface.
3460 * When selecting this format for a decoder,
3461 * AVCodecContext.hw_frames_ctx should be set to a suitable frames
3462 * context inside the get_format() callback. The frames context
3463 * must have been created on a device of the specified type.
3465 AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX = 0x02,
3467 * The codec supports this format by some internal method.
3469 * This format can be selected without any additional configuration -
3470 * no device or frames context is required.
3472 AV_CODEC_HW_CONFIG_METHOD_INTERNAL = 0x04,
3474 * The codec supports this format by some ad-hoc method.
3476 * Additional settings and/or function calls are required. See the
3477 * codec-specific documentation for details. (Methods requiring
3478 * this sort of configuration are deprecated and others should be
3479 * used in preference.)
3481 AV_CODEC_HW_CONFIG_METHOD_AD_HOC = 0x08,
3484 typedef struct AVCodecHWConfig {
3486 * A hardware pixel format which the codec can use.
3488 enum AVPixelFormat pix_fmt;
3490 * Bit set of AV_CODEC_HW_CONFIG_METHOD_* flags, describing the possible
3491 * setup methods which can be used with this configuration.
3495 * The device type associated with the configuration.
3497 * Must be set for AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX and
3498 * AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX, otherwise unused.
3500 enum AVHWDeviceType device_type;
3503 typedef struct AVCodecDefault AVCodecDefault;
3510 typedef struct AVCodec {
3512 * Name of the codec implementation.
3513 * The name is globally unique among encoders and among decoders (but an
3514 * encoder and a decoder can share the same name).
3515 * This is the primary way to find a codec from the user perspective.
3519 * Descriptive name for the codec, meant to be more human readable than name.
3520 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3522 const char *long_name;
3523 enum AVMediaType type;
3526 * Codec capabilities.
3527 * see AV_CODEC_CAP_*
3530 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3531 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3532 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3533 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3534 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3535 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3536 const AVClass *priv_class; ///< AVClass for the private context
3537 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3540 * Group name of the codec implementation.
3541 * This is a short symbolic name of the wrapper backing this codec. A
3542 * wrapper uses some kind of external implementation for the codec, such
3543 * as an external library, or a codec implementation provided by the OS or
3545 * If this field is NULL, this is a builtin, libavcodec native codec.
3546 * If non-NULL, this will be the suffix in AVCodec.name in most cases
3547 * (usually AVCodec.name will be of the form "<codec_name>_<wrapper_name>").
3549 const char *wrapper_name;
3551 /*****************************************************************
3552 * No fields below this line are part of the public API. They
3553 * may not be used outside of libavcodec and can be changed and
3555 * New public fields should be added right above.
3556 *****************************************************************
3559 struct AVCodec *next;
3561 * @name Frame-level threading support functions
3565 * If defined, called on thread contexts when they are created.
3566 * If the codec allocates writable tables in init(), re-allocate them here.
3567 * priv_data will be set to a copy of the original.
3569 int (*init_thread_copy)(AVCodecContext *);
3571 * Copy necessary context variables from a previous thread context to the current one.
3572 * If not defined, the next thread will start automatically; otherwise, the codec
3573 * must call ff_thread_finish_setup().
3575 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3577 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3581 * Private codec-specific defaults.
3583 const AVCodecDefault *defaults;
3586 * Initialize codec static data, called from avcodec_register().
3588 * This is not intended for time consuming operations as it is
3589 * run for every codec regardless of that codec being used.
3591 void (*init_static_data)(struct AVCodec *codec);
3593 int (*init)(AVCodecContext *);
3594 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3595 const struct AVSubtitle *sub);
3597 * Encode data to an AVPacket.
3599 * @param avctx codec context
3600 * @param avpkt output AVPacket (may contain a user-provided buffer)
3601 * @param[in] frame AVFrame containing the raw data to be encoded
3602 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3603 * non-empty packet was returned in avpkt.
3604 * @return 0 on success, negative error code on failure
3606 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3607 int *got_packet_ptr);
3608 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3609 int (*close)(AVCodecContext *);
3611 * Encode API with decoupled packet/frame dataflow. The API is the
3612 * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3614 * - never called if the codec is closed or the wrong type,
3615 * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3616 * - only one drain frame is ever passed down,
3618 int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
3619 int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
3622 * Decode API with decoupled packet/frame dataflow. This function is called
3623 * to get one output frame. It should call ff_decode_get_packet() to obtain
3626 int (*receive_frame)(AVCodecContext *avctx, AVFrame *frame);
3629 * Will be called when seeking
3631 void (*flush)(AVCodecContext *);
3633 * Internal codec capabilities.
3634 * See FF_CODEC_CAP_* in internal.h
3639 * Decoding only, a comma-separated list of bitstream filters to apply to
3640 * packets before decoding.
3645 * Array of pointers to hardware configurations supported by the codec,
3646 * or NULL if no hardware supported. The array is terminated by a NULL
3649 * The user can only access this field via avcodec_get_hw_config().
3651 const struct AVCodecHWConfigInternal **hw_configs;
3654 * List of supported codec_tags, terminated by FF_CODEC_TAGS_END.
3656 const uint32_t *codec_tags;
3659 #if FF_API_CODEC_GET_SET
3660 attribute_deprecated
3661 int av_codec_get_max_lowres(const AVCodec *codec);
3664 struct MpegEncContext;
3667 * Retrieve supported hardware configurations for a codec.
3669 * Values of index from zero to some maximum return the indexed configuration
3670 * descriptor; all other values return NULL. If the codec does not support
3671 * any hardware configurations then it will always return NULL.
3673 const AVCodecHWConfig *avcodec_get_hw_config(const AVCodec *codec, int index);
3676 * @defgroup lavc_hwaccel AVHWAccel
3678 * @note Nothing in this structure should be accessed by the user. At some
3679 * point in future it will not be externally visible at all.
3683 typedef struct AVHWAccel {
3685 * Name of the hardware accelerated codec.
3686 * The name is globally unique among encoders and among decoders (but an
3687 * encoder and a decoder can share the same name).
3692 * Type of codec implemented by the hardware accelerator.
3694 * See AVMEDIA_TYPE_xxx
3696 enum AVMediaType type;
3699 * Codec implemented by the hardware accelerator.
3701 * See AV_CODEC_ID_xxx
3706 * Supported pixel format.
3708 * Only hardware accelerated formats are supported here.
3710 enum AVPixelFormat pix_fmt;
3713 * Hardware accelerated codec capabilities.
3714 * see AV_HWACCEL_CODEC_CAP_*
3718 /*****************************************************************
3719 * No fields below this line are part of the public API. They
3720 * may not be used outside of libavcodec and can be changed and
3722 * New public fields should be added right above.
3723 *****************************************************************
3727 * Allocate a custom buffer
3729 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3732 * Called at the beginning of each frame or field picture.
3734 * Meaningful frame information (codec specific) is guaranteed to
3735 * be parsed at this point. This function is mandatory.
3737 * Note that buf can be NULL along with buf_size set to 0.
3738 * Otherwise, this means the whole frame is available at this point.
3740 * @param avctx the codec context
3741 * @param buf the frame data buffer base
3742 * @param buf_size the size of the frame in bytes
3743 * @return zero if successful, a negative value otherwise
3745 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3748 * Callback for parameter data (SPS/PPS/VPS etc).
3750 * Useful for hardware decoders which keep persistent state about the
3751 * video parameters, and need to receive any changes to update that state.
3753 * @param avctx the codec context
3754 * @param type the nal unit type
3755 * @param buf the nal unit data buffer
3756 * @param buf_size the size of the nal unit in bytes
3757 * @return zero if successful, a negative value otherwise
3759 int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);
3762 * Callback for each slice.
3764 * Meaningful slice information (codec specific) is guaranteed to
3765 * be parsed at this point. This function is mandatory.
3766 * The only exception is XvMC, that works on MB level.
3768 * @param avctx the codec context
3769 * @param buf the slice data buffer base
3770 * @param buf_size the size of the slice in bytes
3771 * @return zero if successful, a negative value otherwise
3773 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3776 * Called at the end of each frame or field picture.
3778 * The whole picture is parsed at this point and can now be sent
3779 * to the hardware accelerator. This function is mandatory.
3781 * @param avctx the codec context
3782 * @return zero if successful, a negative value otherwise
3784 int (*end_frame)(AVCodecContext *avctx);
3787 * Size of per-frame hardware accelerator private data.
3789 * Private data is allocated with av_mallocz() before
3790 * AVCodecContext.get_buffer() and deallocated after
3791 * AVCodecContext.release_buffer().
3793 int frame_priv_data_size;
3796 * Called for every Macroblock in a slice.
3798 * XvMC uses it to replace the ff_mpv_reconstruct_mb().
3799 * Instead of decoding to raw picture, MB parameters are
3800 * stored in an array provided by the video driver.
3802 * @param s the mpeg context
3804 void (*decode_mb)(struct MpegEncContext *s);
3807 * Initialize the hwaccel private data.
3809 * This will be called from ff_get_format(), after hwaccel and
3810 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3813 int (*init)(AVCodecContext *avctx);
3816 * Uninitialize the hwaccel private data.
3818 * This will be called from get_format() or avcodec_close(), after hwaccel
3819 * and hwaccel_context are already uninitialized.
3821 int (*uninit)(AVCodecContext *avctx);
3824 * Size of the private data to allocate in
3825 * AVCodecInternal.hwaccel_priv_data.
3830 * Internal hwaccel capabilities.
3835 * Fill the given hw_frames context with current codec parameters. Called
3836 * from get_format. Refer to avcodec_get_hw_frames_parameters() for
3839 * This CAN be called before AVHWAccel.init is called, and you must assume
3840 * that avctx->hwaccel_priv_data is invalid.
3842 int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
3846 * HWAccel is experimental and is thus avoided in favor of non experimental
3849 #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
3852 * Hardware acceleration should be used for decoding even if the codec level
3853 * used is unknown or higher than the maximum supported level reported by the
3856 * It's generally a good idea to pass this flag unless you have a specific
3857 * reason not to, as hardware tends to under-report supported levels.
3859 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3862 * Hardware acceleration can output YUV pixel formats with a different chroma
3863 * sampling than 4:2:0 and/or other than 8 bits per component.
3865 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3868 * Hardware acceleration should still be attempted for decoding when the
3869 * codec profile does not match the reported capabilities of the hardware.
3871 * For example, this can be used to try to decode baseline profile H.264
3872 * streams in hardware - it will often succeed, because many streams marked
3873 * as baseline profile actually conform to constrained baseline profile.
3875 * @warning If the stream is actually not supported then the behaviour is
3876 * undefined, and may include returning entirely incorrect output
3877 * while indicating success.
3879 #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
3885 #if FF_API_AVPICTURE
3887 * @defgroup lavc_picture AVPicture
3889 * Functions for working with AVPicture
3894 * Picture data structure.
3896 * Up to four components can be stored into it, the last component is
3898 * @deprecated use AVFrame or imgutils functions instead
3900 typedef struct AVPicture {
3901 attribute_deprecated
3902 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3903 attribute_deprecated
3904 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3912 enum AVSubtitleType {
3915 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3918 * Plain text, the text field must be set by the decoder and is
3919 * authoritative. ass and pict fields may contain approximations.
3924 * Formatted text, the ass field must be set by the decoder and is
3925 * authoritative. pict and text fields may contain approximations.
3930 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3932 typedef struct AVSubtitleRect {
3933 int x; ///< top left corner of pict, undefined when pict is not set
3934 int y; ///< top left corner of pict, undefined when pict is not set
3935 int w; ///< width of pict, undefined when pict is not set
3936 int h; ///< height of pict, undefined when pict is not set
3937 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3939 #if FF_API_AVPICTURE
3941 * @deprecated unused
3943 attribute_deprecated
3947 * data+linesize for the bitmap of this subtitle.
3948 * Can be set for text/ass as well once they are rendered.
3953 enum AVSubtitleType type;
3955 char *text; ///< 0 terminated plain UTF-8 text
3958 * 0 terminated ASS/SSA compatible event line.
3959 * The presentation of this is unaffected by the other values in this
3967 typedef struct AVSubtitle {
3968 uint16_t format; /* 0 = graphics */
3969 uint32_t start_display_time; /* relative to packet pts, in ms */
3970 uint32_t end_display_time; /* relative to packet pts, in ms */
3972 AVSubtitleRect **rects;
3973 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3977 * This struct describes the properties of an encoded stream.
3979 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
3980 * be allocated with avcodec_parameters_alloc() and freed with
3981 * avcodec_parameters_free().
3983 typedef struct AVCodecParameters {
3985 * General type of the encoded data.
3987 enum AVMediaType codec_type;
3989 * Specific type of the encoded data (the codec used).
3991 enum AVCodecID codec_id;
3993 * Additional information about the codec (corresponds to the AVI FOURCC).
3998 * Extra binary data needed for initializing the decoder, codec-dependent.
4000 * Must be allocated with av_malloc() and will be freed by
4001 * avcodec_parameters_free(). The allocated size of extradata must be at
4002 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
4007 * Size of the extradata content in bytes.
4012 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
4013 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
4018 * The average bitrate of the encoded data (in bits per second).
4023 * The number of bits per sample in the codedwords.
4025 * This is basically the bitrate per sample. It is mandatory for a bunch of
4026 * formats to actually decode them. It's the number of bits for one sample in
4027 * the actual coded bitstream.
4029 * This could be for example 4 for ADPCM
4030 * For PCM formats this matches bits_per_raw_sample
4033 int bits_per_coded_sample;
4036 * This is the number of valid bits in each output sample. If the
4037 * sample format has more bits, the least significant bits are additional
4038 * padding bits, which are always 0. Use right shifts to reduce the sample
4039 * to its actual size. For example, audio formats with 24 bit samples will
4040 * have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32.
4041 * To get the original sample use "(int32_t)sample >> 8"."
4043 * For ADPCM this might be 12 or 16 or similar
4046 int bits_per_raw_sample;
4049 * Codec-specific bitstream restrictions that the stream conforms to.
4055 * Video only. The dimensions of the video frame in pixels.
4061 * Video only. The aspect ratio (width / height) which a single pixel
4062 * should have when displayed.
4064 * When the aspect ratio is unknown / undefined, the numerator should be
4065 * set to 0 (the denominator may have any value).
4067 AVRational sample_aspect_ratio;
4070 * Video only. The order of the fields in interlaced video.
4072 enum AVFieldOrder field_order;
4075 * Video only. Additional colorspace characteristics.
4077 enum AVColorRange color_range;
4078 enum AVColorPrimaries color_primaries;
4079 enum AVColorTransferCharacteristic color_trc;
4080 enum AVColorSpace color_space;
4081 enum AVChromaLocation chroma_location;
4084 * Video only. Number of delayed frames.
4089 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
4090 * unknown or unspecified, otherwise the number of bits set must be equal to
4091 * the channels field.
4093 uint64_t channel_layout;
4095 * Audio only. The number of audio channels.
4099 * Audio only. The number of audio samples per second.
4103 * Audio only. The number of bytes per coded audio frame, required by some
4106 * Corresponds to nBlockAlign in WAVEFORMATEX.
4110 * Audio only. Audio frame size, if known. Required by some formats to be static.
4115 * Audio only. The amount of padding (in samples) inserted by the encoder at
4116 * the beginning of the audio. I.e. this number of leading decoded samples
4117 * must be discarded by the caller to get the original audio without leading
4120 int initial_padding;
4122 * Audio only. The amount of padding (in samples) appended by the encoder to
4123 * the end of the audio. I.e. this number of decoded samples must be
4124 * discarded by the caller from the end of the stream to get the original
4125 * audio without any trailing padding.
4127 int trailing_padding;
4129 * Audio only. Number of samples to skip after a discontinuity.
4132 } AVCodecParameters;
4135 * Iterate over all registered codecs.
4137 * @param opaque a pointer where libavcodec will store the iteration state. Must
4138 * point to NULL to start the iteration.
4140 * @return the next registered codec or NULL when the iteration is
4143 const AVCodec *av_codec_iterate(void **opaque);
4147 * If c is NULL, returns the first registered codec,
4148 * if c is non-NULL, returns the next registered codec after c,
4149 * or NULL if c is the last one.
4151 attribute_deprecated
4152 AVCodec *av_codec_next(const AVCodec *c);
4156 * Return the LIBAVCODEC_VERSION_INT constant.
4158 unsigned avcodec_version(void);
4161 * Return the libavcodec build-time configuration.
4163 const char *avcodec_configuration(void);
4166 * Return the libavcodec license.
4168 const char *avcodec_license(void);
4172 * Register the codec codec and initialize libavcodec.
4174 * @warning either this function or avcodec_register_all() must be called
4175 * before any other libavcodec functions.
4177 * @see avcodec_register_all()
4179 attribute_deprecated
4180 void avcodec_register(AVCodec *codec);
4183 * Register all the codecs, parsers and bitstream filters which were enabled at
4184 * configuration time. If you do not call this function you can select exactly
4185 * which formats you want to support, by using the individual registration
4188 * @see avcodec_register
4189 * @see av_register_codec_parser
4190 * @see av_register_bitstream_filter
4192 attribute_deprecated
4193 void avcodec_register_all(void);
4197 * Allocate an AVCodecContext and set its fields to default values. The
4198 * resulting struct should be freed with avcodec_free_context().
4200 * @param codec if non-NULL, allocate private data and initialize defaults
4201 * for the given codec. It is illegal to then call avcodec_open2()
4202 * with a different codec.
4203 * If NULL, then the codec-specific defaults won't be initialized,
4204 * which may result in suboptimal default settings (this is
4205 * important mainly for encoders, e.g. libx264).
4207 * @return An AVCodecContext filled with default values or NULL on failure.
4209 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
4212 * Free the codec context and everything associated with it and write NULL to
4213 * the provided pointer.
4215 void avcodec_free_context(AVCodecContext **avctx);
4217 #if FF_API_GET_CONTEXT_DEFAULTS
4219 * @deprecated This function should not be used, as closing and opening a codec
4220 * context multiple time is not supported. A new codec context should be
4221 * allocated for each new use.
4223 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
4227 * Get the AVClass for AVCodecContext. It can be used in combination with
4228 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4230 * @see av_opt_find().
4232 const AVClass *avcodec_get_class(void);
4234 #if FF_API_COPY_CONTEXT
4236 * Get the AVClass for AVFrame. It can be used in combination with
4237 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4239 * @see av_opt_find().
4241 const AVClass *avcodec_get_frame_class(void);
4244 * Get the AVClass for AVSubtitleRect. It can be used in combination with
4245 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4247 * @see av_opt_find().
4249 const AVClass *avcodec_get_subtitle_rect_class(void);
4252 * Copy the settings of the source AVCodecContext into the destination
4253 * AVCodecContext. The resulting destination codec context will be
4254 * unopened, i.e. you are required to call avcodec_open2() before you
4255 * can use this AVCodecContext to decode/encode video/audio data.
4257 * @param dest target codec context, should be initialized with
4258 * avcodec_alloc_context3(NULL), but otherwise uninitialized
4259 * @param src source codec context
4260 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4262 * @deprecated The semantics of this function are ill-defined and it should not
4263 * be used. If you need to transfer the stream parameters from one codec context
4264 * to another, use an intermediate AVCodecParameters instance and the
4265 * avcodec_parameters_from_context() / avcodec_parameters_to_context()
4268 attribute_deprecated
4269 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
4273 * Allocate a new AVCodecParameters and set its fields to default values
4274 * (unknown/invalid/0). The returned struct must be freed with
4275 * avcodec_parameters_free().
4277 AVCodecParameters *avcodec_parameters_alloc(void);
4280 * Free an AVCodecParameters instance and everything associated with it and
4281 * write NULL to the supplied pointer.
4283 void avcodec_parameters_free(AVCodecParameters **par);
4286 * Copy the contents of src to dst. Any allocated fields in dst are freed and
4287 * replaced with newly allocated duplicates of the corresponding fields in src.
4289 * @return >= 0 on success, a negative AVERROR code on failure.
4291 int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
4294 * Fill the parameters struct based on the values from the supplied codec
4295 * context. Any allocated fields in par are freed and replaced with duplicates
4296 * of the corresponding fields in codec.
4298 * @return >= 0 on success, a negative AVERROR code on failure
4300 int avcodec_parameters_from_context(AVCodecParameters *par,
4301 const AVCodecContext *codec);
4304 * Fill the codec context based on the values from the supplied codec
4305 * parameters. Any allocated fields in codec that have a corresponding field in
4306 * par are freed and replaced with duplicates of the corresponding field in par.
4307 * Fields in codec that do not have a counterpart in par are not touched.
4309 * @return >= 0 on success, a negative AVERROR code on failure.
4311 int avcodec_parameters_to_context(AVCodecContext *codec,
4312 const AVCodecParameters *par);
4315 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4316 * function the context has to be allocated with avcodec_alloc_context3().
4318 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4319 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4320 * retrieving a codec.
4322 * @warning This function is not thread safe!
4324 * @note Always call this function before using decoding routines (such as
4325 * @ref avcodec_receive_frame()).
4328 * avcodec_register_all();
4329 * av_dict_set(&opts, "b", "2.5M", 0);
4330 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
4334 * context = avcodec_alloc_context3(codec);
4336 * if (avcodec_open2(context, codec, opts) < 0)
4340 * @param avctx The context to initialize.
4341 * @param codec The codec to open this context for. If a non-NULL codec has been
4342 * previously passed to avcodec_alloc_context3() or
4343 * for this context, then this parameter MUST be either NULL or
4344 * equal to the previously passed codec.
4345 * @param options A dictionary filled with AVCodecContext and codec-private options.
4346 * On return this object will be filled with options that were not found.
4348 * @return zero on success, a negative value on error
4349 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4350 * av_dict_set(), av_opt_find().
4352 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4355 * Close a given AVCodecContext and free all the data associated with it
4356 * (but not the AVCodecContext itself).
4358 * Calling this function on an AVCodecContext that hasn't been opened will free
4359 * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
4360 * codec. Subsequent calls will do nothing.
4362 * @note Do not use this function. Use avcodec_free_context() to destroy a
4363 * codec context (either open or closed). Opening and closing a codec context
4364 * multiple times is not supported anymore -- use multiple codec contexts
4367 int avcodec_close(AVCodecContext *avctx);
4370 * Free all allocated data in the given subtitle struct.
4372 * @param sub AVSubtitle to free.
4374 void avsubtitle_free(AVSubtitle *sub);
4381 * @addtogroup lavc_packet
4386 * Allocate an AVPacket and set its fields to default values. The resulting
4387 * struct must be freed using av_packet_free().
4389 * @return An AVPacket filled with default values or NULL on failure.
4391 * @note this only allocates the AVPacket itself, not the data buffers. Those
4392 * must be allocated through other means such as av_new_packet.
4394 * @see av_new_packet
4396 AVPacket *av_packet_alloc(void);
4399 * Create a new packet that references the same data as src.
4401 * This is a shortcut for av_packet_alloc()+av_packet_ref().
4403 * @return newly created AVPacket on success, NULL on error.
4405 * @see av_packet_alloc
4406 * @see av_packet_ref
4408 AVPacket *av_packet_clone(const AVPacket *src);
4411 * Free the packet, if the packet is reference counted, it will be
4412 * unreferenced first.
4414 * @param pkt packet to be freed. The pointer will be set to NULL.
4415 * @note passing NULL is a no-op.
4417 void av_packet_free(AVPacket **pkt);
4420 * Initialize optional fields of a packet with default values.
4422 * Note, this does not touch the data and size members, which have to be
4423 * initialized separately.
4427 void av_init_packet(AVPacket *pkt);
4430 * Allocate the payload of a packet and initialize its fields with
4434 * @param size wanted payload size
4435 * @return 0 if OK, AVERROR_xxx otherwise
4437 int av_new_packet(AVPacket *pkt, int size);
4440 * Reduce packet size, correctly zeroing padding
4443 * @param size new size
4445 void av_shrink_packet(AVPacket *pkt, int size);
4448 * Increase packet size, correctly zeroing padding
4451 * @param grow_by number of bytes by which to increase the size of the packet
4453 int av_grow_packet(AVPacket *pkt, int grow_by);
4456 * Initialize a reference-counted packet from av_malloc()ed data.
4458 * @param pkt packet to be initialized. This function will set the data, size,
4459 * and buf fields, all others are left untouched.
4460 * @param data Data allocated by av_malloc() to be used as packet data. If this
4461 * function returns successfully, the data is owned by the underlying AVBuffer.
4462 * The caller may not access the data through other means.
4463 * @param size size of data in bytes, without the padding. I.e. the full buffer
4464 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4466 * @return 0 on success, a negative AVERROR on error
4468 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4470 #if FF_API_AVPACKET_OLD_API
4472 * @warning This is a hack - the packet memory allocation stuff is broken. The
4473 * packet is allocated if it was not really allocated.
4475 * @deprecated Use av_packet_ref or av_packet_make_refcounted
4477 attribute_deprecated
4478 int av_dup_packet(AVPacket *pkt);
4480 * Copy packet, including contents
4482 * @return 0 on success, negative AVERROR on fail
4484 * @deprecated Use av_packet_ref
4486 attribute_deprecated
4487 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4490 * Copy packet side data
4492 * @return 0 on success, negative AVERROR on fail
4494 * @deprecated Use av_packet_copy_props
4496 attribute_deprecated
4497 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4502 * @deprecated Use av_packet_unref
4504 * @param pkt packet to free
4506 attribute_deprecated
4507 void av_free_packet(AVPacket *pkt);
4510 * Allocate new information of a packet.
4513 * @param type side information type
4514 * @param size side information size
4515 * @return pointer to fresh allocated data or NULL otherwise
4517 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4521 * Wrap an existing array as a packet side data.
4524 * @param type side information type
4525 * @param data the side data array. It must be allocated with the av_malloc()
4526 * family of functions. The ownership of the data is transferred to
4528 * @param size side information size
4529 * @return a non-negative number on success, a negative AVERROR code on
4530 * failure. On failure, the packet is unchanged and the data remains
4531 * owned by the caller.
4533 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4534 uint8_t *data, size_t size);
4537 * Shrink the already allocated side data buffer
4540 * @param type side information type
4541 * @param size new side information size
4542 * @return 0 on success, < 0 on failure
4544 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4548 * Get side information from packet.
4551 * @param type desired side information type
4552 * @param size pointer for side information size to store (optional)
4553 * @return pointer to data if present or NULL otherwise
4555 uint8_t* av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type,
4558 #if FF_API_MERGE_SD_API
4559 attribute_deprecated
4560 int av_packet_merge_side_data(AVPacket *pkt);
4562 attribute_deprecated
4563 int av_packet_split_side_data(AVPacket *pkt);
4566 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4569 * Pack a dictionary for use in side_data.
4571 * @param dict The dictionary to pack.
4572 * @param size pointer to store the size of the returned data
4573 * @return pointer to data if successful, NULL otherwise
4575 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4577 * Unpack a dictionary from side_data.
4579 * @param data data from side_data
4580 * @param size size of the data
4581 * @param dict the metadata storage dictionary
4582 * @return 0 on success, < 0 on failure
4584 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4588 * Convenience function to free all the side data stored.
4589 * All the other fields stay untouched.
4593 void av_packet_free_side_data(AVPacket *pkt);
4596 * Setup a new reference to the data described by a given packet
4598 * If src is reference-counted, setup dst as a new reference to the
4599 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4600 * data from src into it.
4602 * All the other fields are copied from src.
4604 * @see av_packet_unref
4606 * @param dst Destination packet
4607 * @param src Source packet
4609 * @return 0 on success, a negative AVERROR on error.
4611 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4616 * Unreference the buffer referenced by the packet and reset the
4617 * remaining packet fields to their default values.
4619 * @param pkt The packet to be unreferenced.
4621 void av_packet_unref(AVPacket *pkt);
4624 * Move every field in src to dst and reset src.
4626 * @see av_packet_unref
4628 * @param src Source packet, will be reset
4629 * @param dst Destination packet
4631 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4634 * Copy only "properties" fields from src to dst.
4636 * Properties for the purpose of this function are all the fields
4637 * beside those related to the packet data (buf, data, size)
4639 * @param dst Destination packet
4640 * @param src Source packet
4642 * @return 0 on success AVERROR on failure.
4644 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4647 * Ensure the data described by a given packet is reference counted.
4649 * @note This function does not ensure that the reference will be writable.
4650 * Use av_packet_make_writable instead for that purpose.
4652 * @see av_packet_ref
4653 * @see av_packet_make_writable
4655 * @param pkt packet whose data should be made reference counted.
4657 * @return 0 on success, a negative AVERROR on error. On failure, the
4658 * packet is unchanged.
4660 int av_packet_make_refcounted(AVPacket *pkt);
4663 * Create a writable reference for the data described by a given packet,
4664 * avoiding data copy if possible.
4666 * @param pkt Packet whose data should be made writable.
4668 * @return 0 on success, a negative AVERROR on failure. On failure, the
4669 * packet is unchanged.
4671 int av_packet_make_writable(AVPacket *pkt);
4674 * Convert valid timing fields (timestamps / durations) in a packet from one
4675 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4678 * @param pkt packet on which the conversion will be performed
4679 * @param tb_src source timebase, in which the timing fields in pkt are
4681 * @param tb_dst destination timebase, to which the timing fields will be
4684 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4691 * @addtogroup lavc_decoding
4696 * Find a registered decoder with a matching codec ID.
4698 * @param id AVCodecID of the requested decoder
4699 * @return A decoder if one was found, NULL otherwise.
4701 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4704 * Find a registered decoder with the specified name.
4706 * @param name name of the requested decoder
4707 * @return A decoder if one was found, NULL otherwise.
4709 AVCodec *avcodec_find_decoder_by_name(const char *name);
4712 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4713 * it can be called by custom get_buffer2() implementations for decoders without
4714 * AV_CODEC_CAP_DR1 set.
4716 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4719 * Modify width and height values so that they will result in a memory
4720 * buffer that is acceptable for the codec if you do not use any horizontal
4723 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4725 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4728 * Modify width and height values so that they will result in a memory
4729 * buffer that is acceptable for the codec if you also ensure that all
4730 * line sizes are a multiple of the respective linesize_align[i].
4732 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4734 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4735 int linesize_align[AV_NUM_DATA_POINTERS]);
4738 * Converts AVChromaLocation to swscale x/y chroma position.
4740 * The positions represent the chroma (0,0) position in a coordinates system
4741 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4743 * @param xpos horizontal chroma sample position
4744 * @param ypos vertical chroma sample position
4746 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4749 * Converts swscale x/y chroma position to AVChromaLocation.
4751 * The positions represent the chroma (0,0) position in a coordinates system
4752 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4754 * @param xpos horizontal chroma sample position
4755 * @param ypos vertical chroma sample position
4757 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4760 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4762 * Some decoders may support multiple frames in a single AVPacket. Such
4763 * decoders would then just decode the first frame and the return value would be
4764 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4765 * called again with an AVPacket containing the remaining data in order to
4766 * decode the second frame, etc... Even if no frames are returned, the packet
4767 * needs to be fed to the decoder with remaining data until it is completely
4768 * consumed or an error occurs.
4770 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4771 * and output. This means that for some packets they will not immediately
4772 * produce decoded output and need to be flushed at the end of decoding to get
4773 * all the decoded data. Flushing is done by calling this function with packets
4774 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4775 * returning samples. It is safe to flush even those decoders that are not
4776 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4778 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4779 * larger than the actual read bytes because some optimized bitstream
4780 * readers read 32 or 64 bits at once and could read over the end.
4782 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4783 * before packets may be fed to the decoder.
4785 * @param avctx the codec context
4786 * @param[out] frame The AVFrame in which to store decoded audio samples.
4787 * The decoder will allocate a buffer for the decoded frame by
4788 * calling the AVCodecContext.get_buffer2() callback.
4789 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4790 * reference counted and the returned reference belongs to the
4791 * caller. The caller must release the frame using av_frame_unref()
4792 * when the frame is no longer needed. The caller may safely write
4793 * to the frame if av_frame_is_writable() returns 1.
4794 * When AVCodecContext.refcounted_frames is set to 0, the returned
4795 * reference belongs to the decoder and is valid only until the
4796 * next call to this function or until closing or flushing the
4797 * decoder. The caller may not write to it.
4798 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4799 * non-zero. Note that this field being set to zero
4800 * does not mean that an error has occurred. For
4801 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4802 * call is guaranteed to produce a frame.
4803 * @param[in] avpkt The input AVPacket containing the input buffer.
4804 * At least avpkt->data and avpkt->size should be set. Some
4805 * decoders might also require additional fields to be set.
4806 * @return A negative error code is returned if an error occurred during
4807 * decoding, otherwise the number of bytes consumed from the input
4808 * AVPacket is returned.
4810 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4812 attribute_deprecated
4813 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4814 int *got_frame_ptr, const AVPacket *avpkt);
4817 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4818 * Some decoders may support multiple frames in a single AVPacket, such
4819 * decoders would then just decode the first frame.
4821 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4822 * the actual read bytes because some optimized bitstream readers read 32 or 64
4823 * bits at once and could read over the end.
4825 * @warning The end of the input buffer buf should be set to 0 to ensure that
4826 * no overreading happens for damaged MPEG streams.
4828 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4829 * between input and output, these need to be fed with avpkt->data=NULL,
4830 * avpkt->size=0 at the end to return the remaining frames.
4832 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4833 * before packets may be fed to the decoder.
4835 * @param avctx the codec context
4836 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4837 * Use av_frame_alloc() to get an AVFrame. The codec will
4838 * allocate memory for the actual bitmap by calling the
4839 * AVCodecContext.get_buffer2() callback.
4840 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4841 * reference counted and the returned reference belongs to the
4842 * caller. The caller must release the frame using av_frame_unref()
4843 * when the frame is no longer needed. The caller may safely write
4844 * to the frame if av_frame_is_writable() returns 1.
4845 * When AVCodecContext.refcounted_frames is set to 0, the returned
4846 * reference belongs to the decoder and is valid only until the
4847 * next call to this function or until closing or flushing the
4848 * decoder. The caller may not write to it.
4850 * @param[in] avpkt The input AVPacket containing the input buffer.
4851 * You can create such packet with av_init_packet() and by then setting
4852 * data and size, some decoders might in addition need other fields like
4853 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4855 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4856 * @return On error a negative value is returned, otherwise the number of bytes
4857 * used or zero if no frame could be decompressed.
4859 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4861 attribute_deprecated
4862 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4863 int *got_picture_ptr,
4864 const AVPacket *avpkt);
4867 * Decode a subtitle message.
4868 * Return a negative value on error, otherwise return the number of bytes used.
4869 * If no subtitle could be decompressed, got_sub_ptr is zero.
4870 * Otherwise, the subtitle is stored in *sub.
4871 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4872 * simplicity, because the performance difference is expected to be negligible
4873 * and reusing a get_buffer written for video codecs would probably perform badly
4874 * due to a potentially very different allocation pattern.
4876 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4877 * and output. This means that for some packets they will not immediately
4878 * produce decoded output and need to be flushed at the end of decoding to get
4879 * all the decoded data. Flushing is done by calling this function with packets
4880 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4881 * returning subtitles. It is safe to flush even those decoders that are not
4882 * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
4884 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4885 * before packets may be fed to the decoder.
4887 * @param avctx the codec context
4888 * @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored,
4889 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4890 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4891 * @param[in] avpkt The input AVPacket containing the input buffer.
4893 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4898 * Supply raw packet data as input to a decoder.
4900 * Internally, this call will copy relevant AVCodecContext fields, which can
4901 * influence decoding per-packet, and apply them when the packet is actually
4902 * decoded. (For example AVCodecContext.skip_frame, which might direct the
4903 * decoder to drop the frame contained by the packet sent with this function.)
4905 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4906 * larger than the actual read bytes because some optimized bitstream
4907 * readers read 32 or 64 bits at once and could read over the end.
4909 * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
4910 * on the same AVCodecContext. It will return unexpected results now
4911 * or in future libavcodec versions.
4913 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4914 * before packets may be fed to the decoder.
4916 * @param avctx codec context
4917 * @param[in] avpkt The input AVPacket. Usually, this will be a single video
4918 * frame, or several complete audio frames.
4919 * Ownership of the packet remains with the caller, and the
4920 * decoder will not write to the packet. The decoder may create
4921 * a reference to the packet data (or copy it if the packet is
4922 * not reference-counted).
4923 * Unlike with older APIs, the packet is always fully consumed,
4924 * and if it contains multiple frames (e.g. some audio codecs),
4925 * will require you to call avcodec_receive_frame() multiple
4926 * times afterwards before you can send a new packet.
4927 * It can be NULL (or an AVPacket with data set to NULL and
4928 * size set to 0); in this case, it is considered a flush
4929 * packet, which signals the end of the stream. Sending the
4930 * first flush packet will return success. Subsequent ones are
4931 * unnecessary and will return AVERROR_EOF. If the decoder
4932 * still has frames buffered, it will return them after sending
4935 * @return 0 on success, otherwise negative error code:
4936 * AVERROR(EAGAIN): input is not accepted in the current state - user
4937 * must read output with avcodec_receive_frame() (once
4938 * all output is read, the packet should be resent, and
4939 * the call will not fail with EAGAIN).
4940 * AVERROR_EOF: the decoder has been flushed, and no new packets can
4941 * be sent to it (also returned if more than 1 flush
4943 * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
4944 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4945 * other errors: legitimate decoding errors
4947 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
4950 * Return decoded output data from a decoder.
4952 * @param avctx codec context
4953 * @param frame This will be set to a reference-counted video or audio
4954 * frame (depending on the decoder type) allocated by the
4955 * decoder. Note that the function will always call
4956 * av_frame_unref(frame) before doing anything else.
4959 * 0: success, a frame was returned
4960 * AVERROR(EAGAIN): output is not available in this state - user must try
4962 * AVERROR_EOF: the decoder has been fully flushed, and there will be
4963 * no more output frames
4964 * AVERROR(EINVAL): codec not opened, or it is an encoder
4965 * AVERROR_INPUT_CHANGED: current decoded frame has changed parameters
4966 * with respect to first decoded frame. Applicable
4967 * when flag AV_CODEC_FLAG_DROPCHANGED is set.
4968 * other negative values: legitimate decoding errors
4970 int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
4973 * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
4974 * to retrieve buffered output packets.
4976 * @param avctx codec context
4977 * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
4978 * Ownership of the frame remains with the caller, and the
4979 * encoder will not write to the frame. The encoder may create
4980 * a reference to the frame data (or copy it if the frame is
4981 * not reference-counted).
4982 * It can be NULL, in which case it is considered a flush
4983 * packet. This signals the end of the stream. If the encoder
4984 * still has packets buffered, it will return them after this
4985 * call. Once flushing mode has been entered, additional flush
4986 * packets are ignored, and sending frames will return
4990 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4991 * can have any number of samples.
4992 * If it is not set, frame->nb_samples must be equal to
4993 * avctx->frame_size for all frames except the last.
4994 * The final frame may be smaller than avctx->frame_size.
4995 * @return 0 on success, otherwise negative error code:
4996 * AVERROR(EAGAIN): input is not accepted in the current state - user
4997 * must read output with avcodec_receive_packet() (once
4998 * all output is read, the packet should be resent, and
4999 * the call will not fail with EAGAIN).
5000 * AVERROR_EOF: the encoder has been flushed, and no new frames can
5002 * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
5003 * decoder, or requires flush
5004 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5005 * other errors: legitimate decoding errors
5007 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
5010 * Read encoded data from the encoder.
5012 * @param avctx codec context
5013 * @param avpkt This will be set to a reference-counted packet allocated by the
5014 * encoder. Note that the function will always call
5015 * av_packet_unref(avpkt) before doing anything else.
5016 * @return 0 on success, otherwise negative error code:
5017 * AVERROR(EAGAIN): output is not available in the current state - user
5018 * must try to send input
5019 * AVERROR_EOF: the encoder has been fully flushed, and there will be
5020 * no more output packets
5021 * AVERROR(EINVAL): codec not opened, or it is an encoder
5022 * other errors: legitimate decoding errors
5024 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
5027 * Create and return a AVHWFramesContext with values adequate for hardware
5028 * decoding. This is meant to get called from the get_format callback, and is
5029 * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.
5030 * This API is for decoding with certain hardware acceleration modes/APIs only.
5032 * The returned AVHWFramesContext is not initialized. The caller must do this
5033 * with av_hwframe_ctx_init().
5035 * Calling this function is not a requirement, but makes it simpler to avoid
5036 * codec or hardware API specific details when manually allocating frames.
5038 * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,
5039 * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes
5040 * it unnecessary to call this function or having to care about
5041 * AVHWFramesContext initialization at all.
5043 * There are a number of requirements for calling this function:
5045 * - It must be called from get_format with the same avctx parameter that was
5046 * passed to get_format. Calling it outside of get_format is not allowed, and
5047 * can trigger undefined behavior.
5048 * - The function is not always supported (see description of return values).
5049 * Even if this function returns successfully, hwaccel initialization could
5050 * fail later. (The degree to which implementations check whether the stream
5051 * is actually supported varies. Some do this check only after the user's
5052 * get_format callback returns.)
5053 * - The hw_pix_fmt must be one of the choices suggested by get_format. If the
5054 * user decides to use a AVHWFramesContext prepared with this API function,
5055 * the user must return the same hw_pix_fmt from get_format.
5056 * - The device_ref passed to this function must support the given hw_pix_fmt.
5057 * - After calling this API function, it is the user's responsibility to
5058 * initialize the AVHWFramesContext (returned by the out_frames_ref parameter),
5059 * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done
5060 * before returning from get_format (this is implied by the normal
5061 * AVCodecContext.hw_frames_ctx API rules).
5062 * - The AVHWFramesContext parameters may change every time time get_format is
5063 * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So
5064 * you are inherently required to go through this process again on every
5066 * - It is perfectly possible to call this function without actually using
5067 * the resulting AVHWFramesContext. One use-case might be trying to reuse a
5068 * previously initialized AVHWFramesContext, and calling this API function
5069 * only to test whether the required frame parameters have changed.
5070 * - Fields that use dynamically allocated values of any kind must not be set
5071 * by the user unless setting them is explicitly allowed by the documentation.
5072 * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,
5073 * the new free callback must call the potentially set previous free callback.
5074 * This API call may set any dynamically allocated fields, including the free
5077 * The function will set at least the following fields on AVHWFramesContext
5078 * (potentially more, depending on hwaccel API):
5080 * - All fields set by av_hwframe_ctx_alloc().
5081 * - Set the format field to hw_pix_fmt.
5082 * - Set the sw_format field to the most suited and most versatile format. (An
5083 * implication is that this will prefer generic formats over opaque formats
5084 * with arbitrary restrictions, if possible.)
5085 * - Set the width/height fields to the coded frame size, rounded up to the
5086 * API-specific minimum alignment.
5087 * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size
5088 * field to the number of maximum reference surfaces possible with the codec,
5089 * plus 1 surface for the user to work (meaning the user can safely reference
5090 * at most 1 decoded surface at a time), plus additional buffering introduced
5091 * by frame threading. If the hwaccel does not require pre-allocation, the
5092 * field is left to 0, and the decoder will allocate new surfaces on demand
5094 * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying
5097 * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but
5098 * with basic frame parameters set.
5100 * The function is stateless, and does not change the AVCodecContext or the
5101 * device_ref AVHWDeviceContext.
5103 * @param avctx The context which is currently calling get_format, and which
5104 * implicitly contains all state needed for filling the returned
5105 * AVHWFramesContext properly.
5106 * @param device_ref A reference to the AVHWDeviceContext describing the device
5107 * which will be used by the hardware decoder.
5108 * @param hw_pix_fmt The hwaccel format you are going to return from get_format.
5109 * @param out_frames_ref On success, set to a reference to an _uninitialized_
5110 * AVHWFramesContext, created from the given device_ref.
5111 * Fields will be set to values required for decoding.
5112 * Not changed if an error is returned.
5113 * @return zero on success, a negative value on error. The following error codes
5114 * have special semantics:
5115 * AVERROR(ENOENT): the decoder does not support this functionality. Setup
5116 * is always manual, or it is a decoder which does not
5117 * support setting AVCodecContext.hw_frames_ctx at all,
5118 * or it is a software format.
5119 * AVERROR(EINVAL): it is known that hardware decoding is not supported for
5120 * this configuration, or the device_ref is not supported
5121 * for the hwaccel referenced by hw_pix_fmt.
5123 int avcodec_get_hw_frames_parameters(AVCodecContext *avctx,
5124 AVBufferRef *device_ref,
5125 enum AVPixelFormat hw_pix_fmt,
5126 AVBufferRef **out_frames_ref);
5131 * @defgroup lavc_parsing Frame parsing
5135 enum AVPictureStructure {
5136 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
5137 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
5138 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
5139 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
5142 typedef struct AVCodecParserContext {
5144 struct AVCodecParser *parser;
5145 int64_t frame_offset; /* offset of the current frame */
5146 int64_t cur_offset; /* current offset
5147 (incremented by each av_parser_parse()) */
5148 int64_t next_frame_offset; /* offset of the next frame */
5150 int pict_type; /* XXX: Put it back in AVCodecContext. */
5152 * This field is used for proper frame duration computation in lavf.
5153 * It signals, how much longer the frame duration of the current frame
5154 * is compared to normal frame duration.
5156 * frame_duration = (1 + repeat_pict) * time_base
5158 * It is used by codecs like H.264 to display telecined material.
5160 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
5161 int64_t pts; /* pts of the current frame */
5162 int64_t dts; /* dts of the current frame */
5167 int fetch_timestamp;
5169 #define AV_PARSER_PTS_NB 4
5170 int cur_frame_start_index;
5171 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
5172 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
5173 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
5176 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
5177 #define PARSER_FLAG_ONCE 0x0002
5178 /// Set if the parser has a valid file offset
5179 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
5180 #define PARSER_FLAG_USE_CODEC_TS 0x1000
5182 int64_t offset; ///< byte offset from starting packet start
5183 int64_t cur_frame_end[AV_PARSER_PTS_NB];
5186 * Set by parser to 1 for key frames and 0 for non-key frames.
5187 * It is initialized to -1, so if the parser doesn't set this flag,
5188 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
5193 #if FF_API_CONVERGENCE_DURATION
5195 * @deprecated unused
5197 attribute_deprecated
5198 int64_t convergence_duration;
5201 // Timestamp generation support:
5203 * Synchronization point for start of timestamp generation.
5205 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
5208 * For example, this corresponds to presence of H.264 buffering period
5214 * Offset of the current timestamp against last timestamp sync point in
5215 * units of AVCodecContext.time_base.
5217 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5218 * contain a valid timestamp offset.
5220 * Note that the timestamp of sync point has usually a nonzero
5221 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
5222 * the next frame after timestamp sync point will be usually 1.
5224 * For example, this corresponds to H.264 cpb_removal_delay.
5226 int dts_ref_dts_delta;
5229 * Presentation delay of current frame in units of AVCodecContext.time_base.
5231 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5232 * contain valid non-negative timestamp delta (presentation time of a frame
5233 * must not lie in the past).
5235 * This delay represents the difference between decoding and presentation
5236 * time of the frame.
5238 * For example, this corresponds to H.264 dpb_output_delay.
5243 * Position of the packet in file.
5245 * Analogous to cur_frame_pts/dts
5247 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
5250 * Byte position of currently parsed frame in stream.
5255 * Previous frame byte position.
5260 * Duration of the current frame.
5261 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
5262 * For all other types, this is in units of AVCodecContext.time_base.
5266 enum AVFieldOrder field_order;
5269 * Indicate whether a picture is coded as a frame, top field or bottom field.
5271 * For example, H.264 field_pic_flag equal to 0 corresponds to
5272 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
5273 * equal to 1 and bottom_field_flag equal to 0 corresponds to
5274 * AV_PICTURE_STRUCTURE_TOP_FIELD.
5276 enum AVPictureStructure picture_structure;
5279 * Picture number incremented in presentation or output order.
5280 * This field may be reinitialized at the first picture of a new sequence.
5282 * For example, this corresponds to H.264 PicOrderCnt.
5284 int output_picture_number;
5287 * Dimensions of the decoded video intended for presentation.
5293 * Dimensions of the coded video.
5299 * The format of the coded data, corresponds to enum AVPixelFormat for video
5300 * and for enum AVSampleFormat for audio.
5302 * Note that a decoder can have considerable freedom in how exactly it
5303 * decodes the data, so the format reported here might be different from the
5304 * one returned by a decoder.
5307 } AVCodecParserContext;
5309 typedef struct AVCodecParser {
5310 int codec_ids[5]; /* several codec IDs are permitted */
5312 int (*parser_init)(AVCodecParserContext *s);
5313 /* This callback never returns an error, a negative value means that
5314 * the frame start was in a previous packet. */
5315 int (*parser_parse)(AVCodecParserContext *s,
5316 AVCodecContext *avctx,
5317 const uint8_t **poutbuf, int *poutbuf_size,
5318 const uint8_t *buf, int buf_size);
5319 void (*parser_close)(AVCodecParserContext *s);
5320 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
5321 struct AVCodecParser *next;
5325 * Iterate over all registered codec parsers.
5327 * @param opaque a pointer where libavcodec will store the iteration state. Must
5328 * point to NULL to start the iteration.
5330 * @return the next registered codec parser or NULL when the iteration is
5333 const AVCodecParser *av_parser_iterate(void **opaque);
5335 attribute_deprecated
5336 AVCodecParser *av_parser_next(const AVCodecParser *c);
5338 attribute_deprecated
5339 void av_register_codec_parser(AVCodecParser *parser);
5340 AVCodecParserContext *av_parser_init(int codec_id);
5345 * @param s parser context.
5346 * @param avctx codec context.
5347 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
5348 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
5349 * @param buf input buffer.
5350 * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
5351 size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
5352 To signal EOF, this should be 0 (so that the last frame
5354 * @param pts input presentation timestamp.
5355 * @param dts input decoding timestamp.
5356 * @param pos input byte position in stream.
5357 * @return the number of bytes of the input bitstream used.
5362 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
5369 * decode_frame(data, size);
5373 int av_parser_parse2(AVCodecParserContext *s,
5374 AVCodecContext *avctx,
5375 uint8_t **poutbuf, int *poutbuf_size,
5376 const uint8_t *buf, int buf_size,
5377 int64_t pts, int64_t dts,
5381 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
5382 * @deprecated use AVBitStreamFilter
5384 int av_parser_change(AVCodecParserContext *s,
5385 AVCodecContext *avctx,
5386 uint8_t **poutbuf, int *poutbuf_size,
5387 const uint8_t *buf, int buf_size, int keyframe);
5388 void av_parser_close(AVCodecParserContext *s);
5396 * @addtogroup lavc_encoding
5401 * Find a registered encoder with a matching codec ID.
5403 * @param id AVCodecID of the requested encoder
5404 * @return An encoder if one was found, NULL otherwise.
5406 AVCodec *avcodec_find_encoder(enum AVCodecID id);
5409 * Find a registered encoder with the specified name.
5411 * @param name name of the requested encoder
5412 * @return An encoder if one was found, NULL otherwise.
5414 AVCodec *avcodec_find_encoder_by_name(const char *name);
5417 * Encode a frame of audio.
5419 * Takes input samples from frame and writes the next output packet, if
5420 * available, to avpkt. The output packet does not necessarily contain data for
5421 * the most recent frame, as encoders can delay, split, and combine input frames
5422 * internally as needed.
5424 * @param avctx codec context
5425 * @param avpkt output AVPacket.
5426 * The user can supply an output buffer by setting
5427 * avpkt->data and avpkt->size prior to calling the
5428 * function, but if the size of the user-provided data is not
5429 * large enough, encoding will fail. If avpkt->data and
5430 * avpkt->size are set, avpkt->destruct must also be set. All
5431 * other AVPacket fields will be reset by the encoder using
5432 * av_init_packet(). If avpkt->data is NULL, the encoder will
5433 * allocate it. The encoder will set avpkt->size to the size
5434 * of the output packet.
5436 * If this function fails or produces no output, avpkt will be
5437 * freed using av_packet_unref().
5438 * @param[in] frame AVFrame containing the raw audio data to be encoded.
5439 * May be NULL when flushing an encoder that has the
5440 * AV_CODEC_CAP_DELAY capability set.
5441 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5442 * can have any number of samples.
5443 * If it is not set, frame->nb_samples must be equal to
5444 * avctx->frame_size for all frames except the last.
5445 * The final frame may be smaller than avctx->frame_size.
5446 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5447 * output packet is non-empty, and to 0 if it is
5448 * empty. If the function returns an error, the
5449 * packet can be assumed to be invalid, and the
5450 * value of got_packet_ptr is undefined and should
5452 * @return 0 on success, negative error code on failure
5454 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5456 attribute_deprecated
5457 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
5458 const AVFrame *frame, int *got_packet_ptr);
5461 * Encode a frame of video.
5463 * Takes input raw video data from frame and writes the next output packet, if
5464 * available, to avpkt. The output packet does not necessarily contain data for
5465 * the most recent frame, as encoders can delay and reorder input frames
5466 * internally as needed.
5468 * @param avctx codec context
5469 * @param avpkt output AVPacket.
5470 * The user can supply an output buffer by setting
5471 * avpkt->data and avpkt->size prior to calling the
5472 * function, but if the size of the user-provided data is not
5473 * large enough, encoding will fail. All other AVPacket fields
5474 * will be reset by the encoder using av_init_packet(). If
5475 * avpkt->data is NULL, the encoder will allocate it.
5476 * The encoder will set avpkt->size to the size of the
5477 * output packet. The returned data (if any) belongs to the
5478 * caller, he is responsible for freeing it.
5480 * If this function fails or produces no output, avpkt will be
5481 * freed using av_packet_unref().
5482 * @param[in] frame AVFrame containing the raw video data to be encoded.
5483 * May be NULL when flushing an encoder that has the
5484 * AV_CODEC_CAP_DELAY capability set.
5485 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5486 * output packet is non-empty, and to 0 if it is
5487 * empty. If the function returns an error, the
5488 * packet can be assumed to be invalid, and the
5489 * value of got_packet_ptr is undefined and should
5491 * @return 0 on success, negative error code on failure
5493 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5495 attribute_deprecated
5496 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
5497 const AVFrame *frame, int *got_packet_ptr);
5499 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
5500 const AVSubtitle *sub);
5507 #if FF_API_AVPICTURE
5509 * @addtogroup lavc_picture
5514 * @deprecated unused
5516 attribute_deprecated
5517 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5520 * @deprecated unused
5522 attribute_deprecated
5523 void avpicture_free(AVPicture *picture);
5526 * @deprecated use av_image_fill_arrays() instead.
5528 attribute_deprecated
5529 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5530 enum AVPixelFormat pix_fmt, int width, int height);
5533 * @deprecated use av_image_copy_to_buffer() instead.
5535 attribute_deprecated
5536 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
5537 int width, int height,
5538 unsigned char *dest, int dest_size);
5541 * @deprecated use av_image_get_buffer_size() instead.
5543 attribute_deprecated
5544 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
5547 * @deprecated av_image_copy() instead.
5549 attribute_deprecated
5550 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5551 enum AVPixelFormat pix_fmt, int width, int height);
5554 * @deprecated unused
5556 attribute_deprecated
5557 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5558 enum AVPixelFormat pix_fmt, int top_band, int left_band);
5561 * @deprecated unused
5563 attribute_deprecated
5564 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5565 int padtop, int padbottom, int padleft, int padright, int *color);
5573 * @defgroup lavc_misc Utility functions
5576 * Miscellaneous utility functions related to both encoding and decoding
5582 * @defgroup lavc_misc_pixfmt Pixel formats
5584 * Functions for working with pixel formats.
5588 #if FF_API_GETCHROMA
5590 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
5593 attribute_deprecated
5594 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5598 * Return a value representing the fourCC code associated to the
5599 * pixel format pix_fmt, or 0 if no associated fourCC code can be
5602 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
5605 * @deprecated see av_get_pix_fmt_loss()
5607 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5611 * Find the best pixel format to convert to given a certain source pixel
5612 * format. When converting from one pixel format to another, information loss
5613 * may occur. For example, when converting from RGB24 to GRAY, the color
5614 * information will be lost. Similarly, other losses occur when converting from
5615 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5616 * the given pixel formats should be used to suffer the least amount of loss.
5617 * The pixel formats from which it chooses one, are determined by the
5618 * pix_fmt_list parameter.
5621 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5622 * @param[in] src_pix_fmt source pixel format
5623 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5624 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5625 * @return The best pixel format to convert to or -1 if none was found.
5627 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5628 enum AVPixelFormat src_pix_fmt,
5629 int has_alpha, int *loss_ptr);
5632 * @deprecated see av_find_best_pix_fmt_of_2()
5634 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5635 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5637 attribute_deprecated
5638 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5639 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5641 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5647 #if FF_API_TAG_STRING
5649 * Put a string representing the codec tag codec_tag in buf.
5651 * @param buf buffer to place codec tag in
5652 * @param buf_size size in bytes of buf
5653 * @param codec_tag codec tag to assign
5654 * @return the length of the string that would have been generated if
5655 * enough space had been available, excluding the trailing null
5657 * @deprecated see av_fourcc_make_string() and av_fourcc2str().
5659 attribute_deprecated
5660 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5663 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5666 * Return a name for the specified profile, if available.
5668 * @param codec the codec that is searched for the given profile
5669 * @param profile the profile value for which a name is requested
5670 * @return A name for the profile if found, NULL otherwise.
5672 const char *av_get_profile_name(const AVCodec *codec, int profile);
5675 * Return a name for the specified profile, if available.
5677 * @param codec_id the ID of the codec to which the requested profile belongs
5678 * @param profile the profile value for which a name is requested
5679 * @return A name for the profile if found, NULL otherwise.
5681 * @note unlike av_get_profile_name(), which searches a list of profiles
5682 * supported by a specific decoder or encoder implementation, this
5683 * function searches the list of profiles from the AVCodecDescriptor
5685 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
5687 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5688 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5689 //FIXME func typedef
5692 * Fill AVFrame audio data and linesize pointers.
5694 * The buffer buf must be a preallocated buffer with a size big enough
5695 * to contain the specified samples amount. The filled AVFrame data
5696 * pointers will point to this buffer.
5698 * AVFrame extended_data channel pointers are allocated if necessary for
5701 * @param frame the AVFrame
5702 * frame->nb_samples must be set prior to calling the
5703 * function. This function fills in frame->data,
5704 * frame->extended_data, frame->linesize[0].
5705 * @param nb_channels channel count
5706 * @param sample_fmt sample format
5707 * @param buf buffer to use for frame data
5708 * @param buf_size size of buffer
5709 * @param align plane size sample alignment (0 = default)
5710 * @return >=0 on success, negative error code on failure
5711 * @todo return the size in bytes required to store the samples in
5712 * case of success, at the next libavutil bump
5714 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5715 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5716 int buf_size, int align);
5719 * Reset the internal decoder state / flush internal buffers. Should be called
5720 * e.g. when seeking or when switching to a different stream.
5722 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5723 * this invalidates the frames previously returned from the decoder. When
5724 * refcounted frames are used, the decoder just releases any references it might
5725 * keep internally, but the caller's reference remains valid.
5727 void avcodec_flush_buffers(AVCodecContext *avctx);
5730 * Return codec bits per sample.
5732 * @param[in] codec_id the codec
5733 * @return Number of bits per sample or zero if unknown for the given codec.
5735 int av_get_bits_per_sample(enum AVCodecID codec_id);
5738 * Return the PCM codec associated with a sample format.
5739 * @param be endianness, 0 for little, 1 for big,
5740 * -1 (or anything else) for native
5741 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5743 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5746 * Return codec bits per sample.
5747 * Only return non-zero if the bits per sample is exactly correct, not an
5750 * @param[in] codec_id the codec
5751 * @return Number of bits per sample or zero if unknown for the given codec.
5753 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5756 * Return audio frame duration.
5758 * @param avctx codec context
5759 * @param frame_bytes size of the frame, or 0 if unknown
5760 * @return frame duration, in samples, if known. 0 if not able to
5763 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5766 * This function is the same as av_get_audio_frame_duration(), except it works
5767 * with AVCodecParameters instead of an AVCodecContext.
5769 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
5772 typedef struct AVBitStreamFilterContext {
5774 const struct AVBitStreamFilter *filter;
5775 AVCodecParserContext *parser;
5776 struct AVBitStreamFilterContext *next;
5778 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5779 * Not for access by library users.
5782 } AVBitStreamFilterContext;
5785 typedef struct AVBSFInternal AVBSFInternal;
5788 * The bitstream filter state.
5790 * This struct must be allocated with av_bsf_alloc() and freed with
5793 * The fields in the struct will only be changed (by the caller or by the
5794 * filter) as described in their documentation, and are to be considered
5795 * immutable otherwise.
5797 typedef struct AVBSFContext {
5799 * A class for logging and AVOptions
5801 const AVClass *av_class;
5804 * The bitstream filter this context is an instance of.
5806 const struct AVBitStreamFilter *filter;
5809 * Opaque libavcodec internal data. Must not be touched by the caller in any
5812 AVBSFInternal *internal;
5815 * Opaque filter-specific private data. If filter->priv_class is non-NULL,
5816 * this is an AVOptions-enabled struct.
5821 * Parameters of the input stream. This field is allocated in
5822 * av_bsf_alloc(), it needs to be filled by the caller before
5825 AVCodecParameters *par_in;
5828 * Parameters of the output stream. This field is allocated in
5829 * av_bsf_alloc(), it is set by the filter in av_bsf_init().
5831 AVCodecParameters *par_out;
5834 * The timebase used for the timestamps of the input packets. Set by the
5835 * caller before av_bsf_init().
5837 AVRational time_base_in;
5840 * The timebase used for the timestamps of the output packets. Set by the
5841 * filter in av_bsf_init().
5843 AVRational time_base_out;
5846 typedef struct AVBitStreamFilter {
5850 * A list of codec ids supported by the filter, terminated by
5852 * May be NULL, in that case the bitstream filter works with any codec id.
5854 const enum AVCodecID *codec_ids;
5857 * A class for the private data, used to declare bitstream filter private
5858 * AVOptions. This field is NULL for bitstream filters that do not declare
5861 * If this field is non-NULL, the first member of the filter private data
5862 * must be a pointer to AVClass, which will be set by libavcodec generic
5863 * code to this class.
5865 const AVClass *priv_class;
5867 /*****************************************************************
5868 * No fields below this line are part of the public API. They
5869 * may not be used outside of libavcodec and can be changed and
5871 * New public fields should be added right above.
5872 *****************************************************************
5876 int (*init)(AVBSFContext *ctx);
5877 int (*filter)(AVBSFContext *ctx, AVPacket *pkt);
5878 void (*close)(AVBSFContext *ctx);
5879 void (*flush)(AVBSFContext *ctx);
5880 } AVBitStreamFilter;
5884 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5885 * is deprecated. Use the new bitstream filtering API (using AVBSFContext).
5887 attribute_deprecated
5888 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5890 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5891 * is deprecated. Use av_bsf_get_by_name(), av_bsf_alloc(), and av_bsf_init()
5892 * from the new bitstream filtering API (using AVBSFContext).
5894 attribute_deprecated
5895 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5897 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5898 * is deprecated. Use av_bsf_send_packet() and av_bsf_receive_packet() from the
5899 * new bitstream filtering API (using AVBSFContext).
5901 attribute_deprecated
5902 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5903 AVCodecContext *avctx, const char *args,
5904 uint8_t **poutbuf, int *poutbuf_size,
5905 const uint8_t *buf, int buf_size, int keyframe);
5907 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5908 * is deprecated. Use av_bsf_free() from the new bitstream filtering API (using
5911 attribute_deprecated
5912 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5914 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5915 * is deprecated. Use av_bsf_iterate() from the new bitstream filtering API (using
5918 attribute_deprecated
5919 const AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5923 * @return a bitstream filter with the specified name or NULL if no such
5924 * bitstream filter exists.
5926 const AVBitStreamFilter *av_bsf_get_by_name(const char *name);
5929 * Iterate over all registered bitstream filters.
5931 * @param opaque a pointer where libavcodec will store the iteration state. Must
5932 * point to NULL to start the iteration.
5934 * @return the next registered bitstream filter or NULL when the iteration is
5937 const AVBitStreamFilter *av_bsf_iterate(void **opaque);
5939 attribute_deprecated
5940 const AVBitStreamFilter *av_bsf_next(void **opaque);
5944 * Allocate a context for a given bitstream filter. The caller must fill in the
5945 * context parameters as described in the documentation and then call
5946 * av_bsf_init() before sending any data to the filter.
5948 * @param filter the filter for which to allocate an instance.
5949 * @param ctx a pointer into which the pointer to the newly-allocated context
5950 * will be written. It must be freed with av_bsf_free() after the
5951 * filtering is done.
5953 * @return 0 on success, a negative AVERROR code on failure
5955 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **ctx);
5958 * Prepare the filter for use, after all the parameters and options have been
5961 int av_bsf_init(AVBSFContext *ctx);
5964 * Submit a packet for filtering.
5966 * After sending each packet, the filter must be completely drained by calling
5967 * av_bsf_receive_packet() repeatedly until it returns AVERROR(EAGAIN) or
5970 * @param pkt the packet to filter. The bitstream filter will take ownership of
5971 * the packet and reset the contents of pkt. pkt is not touched if an error occurs.
5972 * If pkt is empty (i.e. NULL, or pkt->data is NULL and pkt->side_data_elems zero),
5973 * it signals the end of the stream (i.e. no more non-empty packets will be sent;
5974 * sending more empty packets does nothing) and will cause the filter to output
5975 * any packets it may have buffered internally.
5977 * @return 0 on success, a negative AVERROR on error. This function never fails if
5980 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt);
5983 * Retrieve a filtered packet.
5985 * @param[out] pkt this struct will be filled with the contents of the filtered
5986 * packet. It is owned by the caller and must be freed using
5987 * av_packet_unref() when it is no longer needed.
5988 * This parameter should be "clean" (i.e. freshly allocated
5989 * with av_packet_alloc() or unreffed with av_packet_unref())
5990 * when this function is called. If this function returns
5991 * successfully, the contents of pkt will be completely
5992 * overwritten by the returned data. On failure, pkt is not
5995 * @return 0 on success. AVERROR(EAGAIN) if more packets need to be sent to the
5996 * filter (using av_bsf_send_packet()) to get more output. AVERROR_EOF if there
5997 * will be no further output from the filter. Another negative AVERROR value if
6000 * @note one input packet may result in several output packets, so after sending
6001 * a packet with av_bsf_send_packet(), this function needs to be called
6002 * repeatedly until it stops returning 0. It is also possible for a filter to
6003 * output fewer packets than were sent to it, so this function may return
6004 * AVERROR(EAGAIN) immediately after a successful av_bsf_send_packet() call.
6006 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt);
6009 * Reset the internal bitstream filter state / flush internal buffers.
6011 void av_bsf_flush(AVBSFContext *ctx);
6014 * Free a bitstream filter context and everything associated with it; write NULL
6015 * into the supplied pointer.
6017 void av_bsf_free(AVBSFContext **ctx);
6020 * Get the AVClass for AVBSFContext. It can be used in combination with
6021 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
6023 * @see av_opt_find().
6025 const AVClass *av_bsf_get_class(void);
6028 * Structure for chain/list of bitstream filters.
6029 * Empty list can be allocated by av_bsf_list_alloc().
6031 typedef struct AVBSFList AVBSFList;
6034 * Allocate empty list of bitstream filters.
6035 * The list must be later freed by av_bsf_list_free()
6036 * or finalized by av_bsf_list_finalize().
6038 * @return Pointer to @ref AVBSFList on success, NULL in case of failure
6040 AVBSFList *av_bsf_list_alloc(void);
6043 * Free list of bitstream filters.
6045 * @param lst Pointer to pointer returned by av_bsf_list_alloc()
6047 void av_bsf_list_free(AVBSFList **lst);
6050 * Append bitstream filter to the list of bitstream filters.
6052 * @param lst List to append to
6053 * @param bsf Filter context to be appended
6055 * @return >=0 on success, negative AVERROR in case of failure
6057 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf);
6060 * Construct new bitstream filter context given it's name and options
6061 * and append it to the list of bitstream filters.
6063 * @param lst List to append to
6064 * @param bsf_name Name of the bitstream filter
6065 * @param options Options for the bitstream filter, can be set to NULL
6067 * @return >=0 on success, negative AVERROR in case of failure
6069 int av_bsf_list_append2(AVBSFList *lst, const char * bsf_name, AVDictionary **options);
6071 * Finalize list of bitstream filters.
6073 * This function will transform @ref AVBSFList to single @ref AVBSFContext,
6074 * so the whole chain of bitstream filters can be treated as single filter
6075 * freshly allocated by av_bsf_alloc().
6076 * If the call is successful, @ref AVBSFList structure is freed and lst
6077 * will be set to NULL. In case of failure, caller is responsible for
6078 * freeing the structure by av_bsf_list_free()
6080 * @param lst Filter list structure to be transformed
6081 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6082 * representing the chain of bitstream filters
6084 * @return >=0 on success, negative AVERROR in case of failure
6086 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf);
6089 * Parse string describing list of bitstream filters and create single
6090 * @ref AVBSFContext describing the whole chain of bitstream filters.
6091 * Resulting @ref AVBSFContext can be treated as any other @ref AVBSFContext freshly
6092 * allocated by av_bsf_alloc().
6094 * @param str String describing chain of bitstream filters in format
6095 * `bsf1[=opt1=val1:opt2=val2][,bsf2]`
6096 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6097 * representing the chain of bitstream filters
6099 * @return >=0 on success, negative AVERROR in case of failure
6101 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf);
6104 * Get null/pass-through bitstream filter.
6106 * @param[out] bsf Pointer to be set to new instance of pass-through bitstream filter
6110 int av_bsf_get_null_filter(AVBSFContext **bsf);
6115 * Same behaviour av_fast_malloc but the buffer has additional
6116 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
6118 * In addition the whole buffer will initially and after resizes
6119 * be 0-initialized so that no uninitialized data will ever appear.
6121 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
6124 * Same behaviour av_fast_padded_malloc except that buffer will always
6125 * be 0-initialized after call.
6127 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
6130 * Encode extradata length to a buffer. Used by xiph codecs.
6132 * @param s buffer to write to; must be at least (v/255+1) bytes long
6133 * @param v size of extradata in bytes
6134 * @return number of bytes written to the buffer.
6136 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
6138 #if FF_API_USER_VISIBLE_AVHWACCEL
6140 * Register the hardware accelerator hwaccel.
6142 * @deprecated This function doesn't do anything.
6144 attribute_deprecated
6145 void av_register_hwaccel(AVHWAccel *hwaccel);
6148 * If hwaccel is NULL, returns the first registered hardware accelerator,
6149 * if hwaccel is non-NULL, returns the next registered hardware accelerator
6150 * after hwaccel, or NULL if hwaccel is the last one.
6152 * @deprecated AVHWaccel structures contain no user-serviceable parts, so
6153 * this function should not be used.
6155 attribute_deprecated
6156 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
6161 * Lock operation used by lockmgr
6163 * @deprecated Deprecated together with av_lockmgr_register().
6166 AV_LOCK_CREATE, ///< Create a mutex
6167 AV_LOCK_OBTAIN, ///< Lock the mutex
6168 AV_LOCK_RELEASE, ///< Unlock the mutex
6169 AV_LOCK_DESTROY, ///< Free mutex resources
6173 * Register a user provided lock manager supporting the operations
6174 * specified by AVLockOp. The "mutex" argument to the function points
6175 * to a (void *) where the lockmgr should store/get a pointer to a user
6176 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
6177 * value left by the last call for all other ops. If the lock manager is
6178 * unable to perform the op then it should leave the mutex in the same
6179 * state as when it was called and return a non-zero value. However,
6180 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
6181 * have been successfully destroyed. If av_lockmgr_register succeeds
6182 * it will return a non-negative value, if it fails it will return a
6183 * negative value and destroy all mutex and unregister all callbacks.
6184 * av_lockmgr_register is not thread-safe, it must be called from a
6185 * single thread before any calls which make use of locking are used.
6187 * @param cb User defined callback. av_lockmgr_register invokes calls
6188 * to this callback and the previously registered callback.
6189 * The callback will be used to create more than one mutex
6190 * each of which must be backed by its own underlying locking
6191 * mechanism (i.e. do not use a single static object to
6192 * implement your lock manager). If cb is set to NULL the
6193 * lockmgr will be unregistered.
6195 * @deprecated This function does nothing, and always returns 0. Be sure to
6196 * build with thread support to get basic thread safety.
6198 attribute_deprecated
6199 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
6203 * Get the type of the given codec.
6205 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
6208 * Get the name of a codec.
6209 * @return a static string identifying the codec; never NULL
6211 const char *avcodec_get_name(enum AVCodecID id);
6214 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
6215 * with no corresponding avcodec_close()), 0 otherwise.
6217 int avcodec_is_open(AVCodecContext *s);
6220 * @return a non-zero number if codec is an encoder, zero otherwise
6222 int av_codec_is_encoder(const AVCodec *codec);
6225 * @return a non-zero number if codec is a decoder, zero otherwise
6227 int av_codec_is_decoder(const AVCodec *codec);
6230 * @return descriptor for given codec ID or NULL if no descriptor exists.
6232 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
6235 * Iterate over all codec descriptors known to libavcodec.
6237 * @param prev previous descriptor. NULL to get the first descriptor.
6239 * @return next descriptor or NULL after the last descriptor
6241 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
6244 * @return codec descriptor with the given name or NULL if no such descriptor
6247 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
6250 * Allocate a CPB properties structure and initialize its fields to default
6253 * @param size if non-NULL, the size of the allocated struct will be written
6254 * here. This is useful for embedding it in side data.
6256 * @return the newly allocated struct or NULL on failure
6258 AVCPBProperties *av_cpb_properties_alloc(size_t *size);
6264 #endif /* AVCODEC_AVCODEC_H */