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.
96 * In both cases, it is recommended that AVPackets and AVFrames are
97 * refcounted, or libavcodec might have to copy the input data. (libavformat
98 * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
99 * refcounted AVFrames.)
100 * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
101 * functions and process their output:
102 * - For decoding, call avcodec_receive_frame(). On success, it will return
103 * an AVFrame containing uncompressed audio or video data.
104 * - For encoding, call avcodec_receive_packet(). On success, it will return
105 * an AVPacket with a compressed frame.
107 * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
108 * AVERROR(EAGAIN) return value means that new input data is required to
109 * return new output. In this case, continue with sending input. For each
110 * input frame/packet, the codec will typically return 1 output frame/packet,
111 * but it can also be 0 or more than 1.
113 * At the beginning of decoding or encoding, the codec might accept multiple
114 * input frames/packets without returning a frame, until its internal buffers
115 * are filled. This situation is handled transparently if you follow the steps
118 * In theory, sending input can result in EAGAIN - this should happen only if
119 * not all output was received. You can use this to structure alternative decode
120 * or encode loops other than the one suggested above. For example, you could
121 * try sending new input on each iteration, and try to receive output if that
124 * End of stream situations. These require "flushing" (aka draining) the codec,
125 * as the codec might buffer multiple frames or packets internally for
126 * performance or out of necessity (consider B-frames).
127 * This is handled as follows:
128 * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
129 * or avcodec_send_frame() (encoding) functions. This will enter draining
131 * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
132 * (encoding) in a loop until AVERROR_EOF is returned. The functions will
133 * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
134 * - Before decoding can be resumed again, the codec has to be reset with
135 * avcodec_flush_buffers().
137 * Using the API as outlined above is highly recommended. But it is also
138 * possible to call functions outside of this rigid schema. For example, you can
139 * call avcodec_send_packet() repeatedly without calling
140 * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
141 * until the codec's internal buffer has been filled up (which is typically of
142 * size 1 per output frame, after initial input), and then reject input with
143 * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
144 * read at least some output.
146 * Not all codecs will follow a rigid and predictable dataflow; the only
147 * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
148 * one end implies that a receive/send call on the other end will succeed, or
149 * at least will not fail with AVERROR(EAGAIN). In general, no codec will
150 * permit unlimited buffering of input or output.
152 * This API replaces the following legacy functions:
153 * - avcodec_decode_video2() and avcodec_decode_audio4():
154 * Use avcodec_send_packet() to feed input to the decoder, then use
155 * avcodec_receive_frame() to receive decoded frames after each packet.
156 * Unlike with the old video decoding API, multiple frames might result from
157 * a packet. For audio, splitting the input packet into frames by partially
158 * decoding packets becomes transparent to the API user. You never need to
159 * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
160 * no data was read from the packet).
161 * Additionally, sending a flush/draining packet is required only once.
162 * - avcodec_encode_video2()/avcodec_encode_audio2():
163 * Use avcodec_send_frame() to feed input to the encoder, then use
164 * avcodec_receive_packet() to receive encoded packets.
165 * Providing user-allocated buffers for avcodec_receive_packet() is not
167 * - The new API does not handle subtitles yet.
169 * Mixing new and old function calls on the same AVCodecContext is not allowed,
170 * and will result in undefined behavior.
172 * Some codecs might require using the new API; using the old API will return
173 * an error when calling it. All codecs support the new API.
175 * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
176 * would be an invalid state, which could put the codec user into an endless
177 * loop. The API has no concept of time either: it cannot happen that trying to
178 * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
179 * later accepts the packet (with no other receive/flush API calls involved).
180 * The API is a strict state machine, and the passage of time is not supposed
181 * to influence it. Some timing-dependent behavior might still be deemed
182 * acceptable in certain cases. But it must never result in both send/receive
183 * returning EAGAIN at the same time at any point. It must also absolutely be
184 * avoided that the current state is "unstable" and can "flip-flop" between
185 * the send/receive APIs allowing progress. For example, it's not allowed that
186 * the codec randomly decides that it actually wants to consume a packet now
187 * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
188 * avcodec_send_packet() call.
193 * @defgroup lavc_core Core functions/structures.
196 * Basic definitions, functions for querying libavcodec capabilities,
197 * allocating core structures, etc.
203 * Identify the syntax and semantics of the bitstream.
204 * The principle is roughly:
205 * Two decoders with the same ID can decode the same streams.
206 * Two encoders with the same ID can encode compatible streams.
207 * There may be slight deviations from the principle due to implementation
210 * If you add a codec ID to this list, add it so that
211 * 1. no value of an existing codec ID changes (that would break ABI),
212 * 2. it is as close as possible to similar codecs
214 * After adding new codec IDs, do not forget to add an entry to the codec
215 * descriptor list and bump libavcodec minor version.
221 AV_CODEC_ID_MPEG1VIDEO,
222 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
233 AV_CODEC_ID_RAWVIDEO,
234 AV_CODEC_ID_MSMPEG4V1,
235 AV_CODEC_ID_MSMPEG4V2,
236 AV_CODEC_ID_MSMPEG4V3,
259 AV_CODEC_ID_INTERPLAY_VIDEO,
266 AV_CODEC_ID_MSVIDEO1,
271 AV_CODEC_ID_TRUEMOTION1,
272 AV_CODEC_ID_VMDVIDEO,
297 AV_CODEC_ID_TRUEMOTION2,
303 AV_CODEC_ID_SMACKVIDEO,
308 AV_CODEC_ID_JPEG2000,
314 AV_CODEC_ID_DSICINVIDEO,
315 AV_CODEC_ID_TIERTEXSEQVIDEO,
323 AV_CODEC_ID_BETHSOFTVID,
335 AV_CODEC_ID_ESCAPE124,
339 AV_CODEC_ID_MOTIONPIXELS,
351 AV_CODEC_ID_FLASHSV2,
352 AV_CODEC_ID_CDGRAPHICS,
355 AV_CODEC_ID_BINKVIDEO,
356 AV_CODEC_ID_IFF_ILBM,
357 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
363 AV_CODEC_ID_A64_MULTI,
364 AV_CODEC_ID_A64_MULTI5,
367 AV_CODEC_ID_LAGARITH,
371 AV_CODEC_ID_WMV3IMAGE,
372 AV_CODEC_ID_VC1IMAGE,
374 AV_CODEC_ID_BMV_VIDEO,
381 AV_CODEC_ID_ZEROCODEC,
390 AV_CODEC_ID_ESCAPE130,
393 AV_CODEC_ID_HNM4_VIDEO,
395 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
397 AV_CODEC_ID_ALIAS_PIX,
398 AV_CODEC_ID_BRENDER_PIX,
399 AV_CODEC_ID_PAF_VIDEO,
412 AV_CODEC_ID_SCREENPRESSO,
416 AV_CODEC_ID_Y41P = 0x8000,
421 AV_CODEC_ID_TARGA_Y216,
433 AV_CODEC_ID_TRUEMOTION2RT,
435 AV_CODEC_ID_MAGICYUV,
436 AV_CODEC_ID_SHEERVIDEO,
443 AV_CODEC_ID_CLEARVIDEO,
446 AV_CODEC_ID_BITPACKED,
453 AV_CODEC_ID_PROSUMER,
467 /* various PCM "codecs" */
468 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
469 AV_CODEC_ID_PCM_S16LE = 0x10000,
470 AV_CODEC_ID_PCM_S16BE,
471 AV_CODEC_ID_PCM_U16LE,
472 AV_CODEC_ID_PCM_U16BE,
475 AV_CODEC_ID_PCM_MULAW,
476 AV_CODEC_ID_PCM_ALAW,
477 AV_CODEC_ID_PCM_S32LE,
478 AV_CODEC_ID_PCM_S32BE,
479 AV_CODEC_ID_PCM_U32LE,
480 AV_CODEC_ID_PCM_U32BE,
481 AV_CODEC_ID_PCM_S24LE,
482 AV_CODEC_ID_PCM_S24BE,
483 AV_CODEC_ID_PCM_U24LE,
484 AV_CODEC_ID_PCM_U24BE,
485 AV_CODEC_ID_PCM_S24DAUD,
486 AV_CODEC_ID_PCM_ZORK,
487 AV_CODEC_ID_PCM_S16LE_PLANAR,
489 AV_CODEC_ID_PCM_F32BE,
490 AV_CODEC_ID_PCM_F32LE,
491 AV_CODEC_ID_PCM_F64BE,
492 AV_CODEC_ID_PCM_F64LE,
493 AV_CODEC_ID_PCM_BLURAY,
496 AV_CODEC_ID_PCM_S8_PLANAR,
497 AV_CODEC_ID_PCM_S24LE_PLANAR,
498 AV_CODEC_ID_PCM_S32LE_PLANAR,
499 AV_CODEC_ID_PCM_S16BE_PLANAR,
501 AV_CODEC_ID_PCM_S64LE = 0x10800,
502 AV_CODEC_ID_PCM_S64BE,
503 AV_CODEC_ID_PCM_F16LE,
504 AV_CODEC_ID_PCM_F24LE,
505 AV_CODEC_ID_PCM_VIDC,
507 /* various ADPCM codecs */
508 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
509 AV_CODEC_ID_ADPCM_IMA_WAV,
510 AV_CODEC_ID_ADPCM_IMA_DK3,
511 AV_CODEC_ID_ADPCM_IMA_DK4,
512 AV_CODEC_ID_ADPCM_IMA_WS,
513 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
514 AV_CODEC_ID_ADPCM_MS,
515 AV_CODEC_ID_ADPCM_4XM,
516 AV_CODEC_ID_ADPCM_XA,
517 AV_CODEC_ID_ADPCM_ADX,
518 AV_CODEC_ID_ADPCM_EA,
519 AV_CODEC_ID_ADPCM_G726,
520 AV_CODEC_ID_ADPCM_CT,
521 AV_CODEC_ID_ADPCM_SWF,
522 AV_CODEC_ID_ADPCM_YAMAHA,
523 AV_CODEC_ID_ADPCM_SBPRO_4,
524 AV_CODEC_ID_ADPCM_SBPRO_3,
525 AV_CODEC_ID_ADPCM_SBPRO_2,
526 AV_CODEC_ID_ADPCM_THP,
527 AV_CODEC_ID_ADPCM_IMA_AMV,
528 AV_CODEC_ID_ADPCM_EA_R1,
529 AV_CODEC_ID_ADPCM_EA_R3,
530 AV_CODEC_ID_ADPCM_EA_R2,
531 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
532 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
533 AV_CODEC_ID_ADPCM_EA_XAS,
534 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
535 AV_CODEC_ID_ADPCM_IMA_ISS,
536 AV_CODEC_ID_ADPCM_G722,
537 AV_CODEC_ID_ADPCM_IMA_APC,
538 AV_CODEC_ID_ADPCM_VIMA,
540 AV_CODEC_ID_ADPCM_AFC = 0x11800,
541 AV_CODEC_ID_ADPCM_IMA_OKI,
542 AV_CODEC_ID_ADPCM_DTK,
543 AV_CODEC_ID_ADPCM_IMA_RAD,
544 AV_CODEC_ID_ADPCM_G726LE,
545 AV_CODEC_ID_ADPCM_THP_LE,
546 AV_CODEC_ID_ADPCM_PSX,
547 AV_CODEC_ID_ADPCM_AICA,
548 AV_CODEC_ID_ADPCM_IMA_DAT4,
549 AV_CODEC_ID_ADPCM_MTAF,
550 AV_CODEC_ID_ADPCM_AGM,
551 AV_CODEC_ID_ADPCM_ARGO,
552 AV_CODEC_ID_ADPCM_IMA_SSI,
553 AV_CODEC_ID_ADPCM_ZORK,
554 AV_CODEC_ID_ADPCM_IMA_APM,
555 AV_CODEC_ID_ADPCM_IMA_ALP,
558 AV_CODEC_ID_AMR_NB = 0x12000,
561 /* RealAudio codecs*/
562 AV_CODEC_ID_RA_144 = 0x13000,
565 /* various DPCM codecs */
566 AV_CODEC_ID_ROQ_DPCM = 0x14000,
567 AV_CODEC_ID_INTERPLAY_DPCM,
568 AV_CODEC_ID_XAN_DPCM,
569 AV_CODEC_ID_SOL_DPCM,
571 AV_CODEC_ID_SDX2_DPCM = 0x14800,
572 AV_CODEC_ID_GREMLIN_DPCM,
575 AV_CODEC_ID_MP2 = 0x15000,
576 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
586 AV_CODEC_ID_VMDAUDIO,
592 AV_CODEC_ID_WESTWOOD_SND1,
593 AV_CODEC_ID_GSM, ///< as in Berlin toast format
596 AV_CODEC_ID_TRUESPEECH,
598 AV_CODEC_ID_SMACKAUDIO,
601 AV_CODEC_ID_DSICINAUDIO,
603 AV_CODEC_ID_MUSEPACK7,
605 AV_CODEC_ID_GSM_MS, /* as found in WAV */
608 AV_CODEC_ID_NELLYMOSER,
609 AV_CODEC_ID_MUSEPACK8,
611 AV_CODEC_ID_WMAVOICE,
613 AV_CODEC_ID_WMALOSSLESS,
622 AV_CODEC_ID_BINKAUDIO_RDFT,
623 AV_CODEC_ID_BINKAUDIO_DCT,
624 AV_CODEC_ID_AAC_LATM,
629 AV_CODEC_ID_8SVX_EXP,
630 AV_CODEC_ID_8SVX_FIB,
631 AV_CODEC_ID_BMV_AUDIO,
636 AV_CODEC_ID_COMFORT_NOISE,
638 AV_CODEC_ID_METASOUND,
639 AV_CODEC_ID_PAF_AUDIO,
644 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
646 AV_CODEC_ID_SONIC_LS,
649 AV_CODEC_ID_DSD_LSBF,
650 AV_CODEC_ID_DSD_MSBF,
651 AV_CODEC_ID_DSD_LSBF_PLANAR,
652 AV_CODEC_ID_DSD_MSBF_PLANAR,
654 AV_CODEC_ID_INTERPLAY_ACM,
658 AV_CODEC_ID_ATRAC3AL,
659 AV_CODEC_ID_ATRAC3PAL,
666 AV_CODEC_ID_ACELP_KELVIN,
667 AV_CODEC_ID_MPEGH_3D_AUDIO,
670 /* subtitle codecs */
671 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
672 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
673 AV_CODEC_ID_DVB_SUBTITLE,
674 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
677 AV_CODEC_ID_MOV_TEXT,
678 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
679 AV_CODEC_ID_DVB_TELETEXT,
682 AV_CODEC_ID_MICRODVD = 0x17800,
686 AV_CODEC_ID_REALTEXT,
688 AV_CODEC_ID_SUBVIEWER1,
689 AV_CODEC_ID_SUBVIEWER,
696 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
698 AV_CODEC_ID_ARIB_CAPTION,
700 /* other specific kind of codecs (generally used for attachments) */
701 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
702 AV_CODEC_ID_TTF = 0x18000,
704 AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
706 AV_CODEC_ID_BINTEXT = 0x18800,
710 AV_CODEC_ID_SMPTE_KLV,
712 AV_CODEC_ID_TIMED_ID3,
713 AV_CODEC_ID_BIN_DATA,
716 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
718 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
719 * stream (only used by libavformat) */
720 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
721 * stream (only used by libavformat) */
722 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
723 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
727 * This struct describes the properties of a single codec described by an
729 * @see avcodec_descriptor_get()
731 typedef struct AVCodecDescriptor {
733 enum AVMediaType type;
735 * Name of the codec described by this descriptor. It is non-empty and
736 * unique for each codec descriptor. It should contain alphanumeric
737 * characters and '_' only.
741 * A more descriptive name for this codec. May be NULL.
743 const char *long_name;
745 * Codec properties, a combination of AV_CODEC_PROP_* flags.
749 * MIME type(s) associated with the codec.
750 * May be NULL; if not, a NULL-terminated array of MIME types.
751 * The first item is always non-NULL and is the preferred MIME type.
753 const char *const *mime_types;
755 * If non-NULL, an array of profiles recognized for this codec.
756 * Terminated with FF_PROFILE_UNKNOWN.
758 const struct AVProfile *profiles;
762 * Codec uses only intra compression.
763 * Video and audio codecs only.
765 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
767 * Codec supports lossy compression. Audio and video codecs only.
768 * @note a codec may support both lossy and lossless
771 #define AV_CODEC_PROP_LOSSY (1 << 1)
773 * Codec supports lossless compression. Audio and video codecs only.
775 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
777 * Codec supports frame reordering. That is, the coded order (the order in which
778 * the encoded packets are output by the encoders / stored / input to the
779 * decoders) may be different from the presentation order of the corresponding
782 * For codecs that do not have this property set, PTS and DTS should always be
785 #define AV_CODEC_PROP_REORDER (1 << 3)
787 * Subtitle codec is bitmap based
788 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
790 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
792 * Subtitle codec is text based.
793 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
795 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
798 * @ingroup lavc_decoding
799 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
800 * This is mainly needed because some optimized bitstream readers read
801 * 32 or 64 bit at once and could read over the end.<br>
802 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
803 * MPEG bitstreams could cause overread and segfault.
805 #define AV_INPUT_BUFFER_PADDING_SIZE 64
808 * @ingroup lavc_encoding
809 * minimum encoding buffer size
810 * Used to avoid some checks during header writing.
812 #define AV_INPUT_BUFFER_MIN_SIZE 16384
815 * @ingroup lavc_decoding
818 /* We leave some space between them for extensions (drop some
819 * keyframes for intra-only or drop just some bidir frames). */
820 AVDISCARD_NONE =-16, ///< discard nothing
821 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
822 AVDISCARD_NONREF = 8, ///< discard all non reference
823 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
824 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
825 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
826 AVDISCARD_ALL = 48, ///< discard all
829 enum AVAudioServiceType {
830 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
831 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
832 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
833 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
834 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
835 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
836 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
837 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
838 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
839 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
843 * @ingroup lavc_encoding
845 typedef struct RcOverride{
848 int qscale; // If this is 0 then quality_factor will be used instead.
849 float quality_factor;
853 These flags can be passed in AVCodecContext.flags before initialization.
854 Note: Not everything is supported yet.
858 * Allow decoders to produce frames with data planes that are not aligned
859 * to CPU requirements (e.g. due to cropping).
861 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
865 #define AV_CODEC_FLAG_QSCALE (1 << 1)
867 * 4 MV per MB allowed / advanced prediction for H.263.
869 #define AV_CODEC_FLAG_4MV (1 << 2)
871 * Output even those frames that might be corrupted.
873 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
877 #define AV_CODEC_FLAG_QPEL (1 << 4)
879 * Don't output frames whose parameters differ from first
880 * decoded frame in stream.
882 #define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
884 * Use internal 2pass ratecontrol in first pass mode.
886 #define AV_CODEC_FLAG_PASS1 (1 << 9)
888 * Use internal 2pass ratecontrol in second pass mode.
890 #define AV_CODEC_FLAG_PASS2 (1 << 10)
894 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
896 * Only decode/encode grayscale.
898 #define AV_CODEC_FLAG_GRAY (1 << 13)
900 * error[?] variables will be set during encoding.
902 #define AV_CODEC_FLAG_PSNR (1 << 15)
904 * Input bitstream might be truncated at a random location
905 * instead of only at frame boundaries.
907 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
909 * Use interlaced DCT.
911 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
915 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
917 * Place global headers in extradata instead of every keyframe.
919 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
921 * Use only bitexact stuff (except (I)DCT).
923 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
924 /* Fx : Flag for H.263+ extra options */
926 * H.263 advanced intra coding / MPEG-4 AC prediction
928 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
930 * interlaced motion estimation
932 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
933 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
936 * Allow non spec compliant speedup tricks.
938 #define AV_CODEC_FLAG2_FAST (1 << 0)
940 * Skip bitstream encoding.
942 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
944 * Place global headers at every keyframe instead of in extradata.
946 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
949 * timecode is in drop frame format. DEPRECATED!!!!
951 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
954 * Input bitstream might be truncated at a packet boundaries
955 * instead of only at frame boundaries.
957 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
959 * Discard cropping information from SPS.
961 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
964 * Show all frames before the first keyframe
966 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
968 * Export motion vectors through frame side data
970 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
972 * Do not skip samples and export skip information as frame side data
974 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
976 * Do not reset ASS ReadOrder field on flush (subtitles decoding)
978 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
980 /* Unsupported options :
981 * Syntax Arithmetic coding (SAC)
982 * Reference Picture Selection
983 * Independent Segment Decoding */
985 /* codec capabilities */
988 * Decoder can use draw_horiz_band callback.
990 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
992 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
993 * If not set, it might not use get_buffer() at all or use operations that
994 * assume the buffer was allocated by avcodec_default_get_buffer.
996 #define AV_CODEC_CAP_DR1 (1 << 1)
997 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
999 * Encoder or decoder requires flushing with NULL input at the end in order to
1000 * give the complete and correct output.
1002 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1003 * with NULL data. The user can still send NULL data to the public encode
1004 * or decode function, but libavcodec will not pass it along to the codec
1005 * unless this flag is set.
1008 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1009 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1013 * The encoder needs to be fed with NULL data at the end of encoding until the
1014 * encoder no longer returns data.
1016 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1017 * flag also means that the encoder must set the pts and duration for
1018 * each output packet. If this flag is not set, the pts and duration will
1019 * be determined by libavcodec from the input frame.
1021 #define AV_CODEC_CAP_DELAY (1 << 5)
1023 * Codec can be fed a final frame with a smaller size.
1024 * This can be used to prevent truncation of the last audio samples.
1026 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
1029 * Codec can output multiple frames per AVPacket
1030 * Normally demuxers return one frame at a time, demuxers which do not do
1031 * are connected to a parser to split what they return into proper frames.
1032 * This flag is reserved to the very rare category of codecs which have a
1033 * bitstream that cannot be split into frames without timeconsuming
1034 * operations like full decoding. Demuxers carrying such bitstreams thus
1035 * may return multiple frames in a packet. This has many disadvantages like
1036 * prohibiting stream copy in many cases thus it should only be considered
1039 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
1041 * Codec is experimental and is thus avoided in favor of non experimental
1044 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
1046 * Codec should fill in channel configuration and samplerate instead of container
1048 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
1050 * Codec supports frame-level multithreading.
1052 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
1054 * Codec supports slice-based (or partition-based) multithreading.
1056 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
1058 * Codec supports changed parameters at any point.
1060 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
1062 * Codec supports avctx->thread_count == 0 (auto).
1064 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
1066 * Audio encoder supports receiving a different number of samples in each call.
1068 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
1070 * Decoder is not a preferred choice for probing.
1071 * This indicates that the decoder is not a good choice for probing.
1072 * It could for example be an expensive to spin up hardware decoder,
1073 * or it could simply not provide a lot of useful information about
1075 * A decoder marked with this flag should only be used as last resort
1076 * choice for probing.
1078 #define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
1080 * Codec is intra only.
1082 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
1084 * Codec is lossless.
1086 #define AV_CODEC_CAP_LOSSLESS 0x80000000
1089 * Codec is backed by a hardware implementation. Typically used to
1090 * identify a non-hwaccel hardware decoder. For information about hwaccels, use
1091 * avcodec_get_hw_config() instead.
1093 #define AV_CODEC_CAP_HARDWARE (1 << 18)
1096 * Codec is potentially backed by a hardware implementation, but not
1097 * necessarily. This is used instead of AV_CODEC_CAP_HARDWARE, if the
1098 * implementation provides some sort of internal fallback.
1100 #define AV_CODEC_CAP_HYBRID (1 << 19)
1103 * This codec takes the reordered_opaque field from input AVFrames
1104 * and returns it in the corresponding field in AVCodecContext after
1107 #define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE (1 << 20)
1109 /* Exported side data.
1110 These flags can be passed in AVCodecContext.export_side_data before initialization.
1113 * Export motion vectors through frame side data
1115 #define AV_CODEC_EXPORT_DATA_MVS (1 << 0)
1117 * Export encoder Producer Reference Time through packet side data
1119 #define AV_CODEC_EXPORT_DATA_PRFT (1 << 1)
1123 * This specifies the area which should be displayed.
1124 * Note there may be multiple such areas for one frame.
1126 typedef struct AVPanScan {
1129 * - encoding: Set by user.
1130 * - decoding: Set by libavcodec.
1135 * width and height in 1/16 pel
1136 * - encoding: Set by user.
1137 * - decoding: Set by libavcodec.
1143 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1144 * - encoding: Set by user.
1145 * - decoding: Set by libavcodec.
1147 int16_t position[3][2];
1151 * This structure describes the bitrate properties of an encoded bitstream. It
1152 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1153 * parameters for H.264/HEVC.
1155 typedef struct AVCPBProperties {
1157 * Maximum bitrate of the stream, in bits per second.
1158 * Zero if unknown or unspecified.
1160 #if FF_API_UNSANITIZED_BITRATES
1163 int64_t max_bitrate;
1166 * Minimum bitrate of the stream, in bits per second.
1167 * Zero if unknown or unspecified.
1169 #if FF_API_UNSANITIZED_BITRATES
1172 int64_t min_bitrate;
1175 * Average bitrate of the stream, in bits per second.
1176 * Zero if unknown or unspecified.
1178 #if FF_API_UNSANITIZED_BITRATES
1181 int64_t avg_bitrate;
1185 * The size of the buffer to which the ratecontrol is applied, in bits.
1186 * Zero if unknown or unspecified.
1191 * The delay between the time the packet this structure is associated with
1192 * is received and the time when it should be decoded, in periods of a 27MHz
1195 * UINT64_MAX when unknown or unspecified.
1201 * This structure supplies correlation between a packet timestamp and a wall clock
1202 * production time. The definition follows the Producer Reference Time ('prft')
1203 * as defined in ISO/IEC 14496-12
1205 typedef struct AVProducerReferenceTime {
1207 * A UTC timestamp, in microseconds, since Unix epoch (e.g, av_gettime()).
1211 } AVProducerReferenceTime;
1214 * The decoder will keep a reference to the frame and may reuse it later.
1216 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1219 * @defgroup lavc_packet AVPacket
1221 * Types and functions for working with AVPacket.
1224 enum AVPacketSideDataType {
1226 * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1227 * bytes worth of palette. This side data signals that a new palette is
1230 AV_PKT_DATA_PALETTE,
1233 * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1234 * that the extradata buffer was changed and the receiving side should
1235 * act upon it appropriately. The new extradata is embedded in the side
1236 * data buffer and should be immediately used for processing the current
1239 AV_PKT_DATA_NEW_EXTRADATA,
1242 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1245 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1246 * s32le channel_count
1247 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1248 * u64le channel_layout
1249 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1251 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1256 AV_PKT_DATA_PARAM_CHANGE,
1259 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1260 * structures with info about macroblocks relevant to splitting the
1261 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1262 * That is, it does not necessarily contain info about all macroblocks,
1263 * as long as the distance between macroblocks in the info is smaller
1264 * than the target payload size.
1265 * Each MB info structure is 12 bytes, and is laid out as follows:
1267 * u32le bit offset from the start of the packet
1268 * u8 current quantizer at the start of the macroblock
1270 * u16le macroblock address within the GOB
1271 * u8 horizontal MV predictor
1272 * u8 vertical MV predictor
1273 * u8 horizontal MV predictor for block number 3
1274 * u8 vertical MV predictor for block number 3
1277 AV_PKT_DATA_H263_MB_INFO,
1280 * This side data should be associated with an audio stream and contains
1281 * ReplayGain information in form of the AVReplayGain struct.
1283 AV_PKT_DATA_REPLAYGAIN,
1286 * This side data contains a 3x3 transformation matrix describing an affine
1287 * transformation that needs to be applied to the decoded video frames for
1288 * correct presentation.
1290 * See libavutil/display.h for a detailed description of the data.
1292 AV_PKT_DATA_DISPLAYMATRIX,
1295 * This side data should be associated with a video stream and contains
1296 * Stereoscopic 3D information in form of the AVStereo3D struct.
1298 AV_PKT_DATA_STEREO3D,
1301 * This side data should be associated with an audio stream and corresponds
1302 * to enum AVAudioServiceType.
1304 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1307 * This side data contains quality related information from the encoder.
1309 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1313 * u64le[error count] sum of squared differences between encoder in and output
1316 AV_PKT_DATA_QUALITY_STATS,
1319 * This side data contains an integer value representing the stream index
1320 * of a "fallback" track. A fallback track indicates an alternate
1321 * track to use when the current track can not be decoded for some reason.
1322 * e.g. no decoder available for codec.
1324 AV_PKT_DATA_FALLBACK_TRACK,
1327 * This side data corresponds to the AVCPBProperties struct.
1329 AV_PKT_DATA_CPB_PROPERTIES,
1332 * Recommmends skipping the specified number of samples
1334 * u32le number of samples to skip from start of this packet
1335 * u32le number of samples to skip from end of this packet
1336 * u8 reason for start skip
1337 * u8 reason for end skip (0=padding silence, 1=convergence)
1340 AV_PKT_DATA_SKIP_SAMPLES,
1343 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1344 * the packet may contain "dual mono" audio specific to Japanese DTV
1345 * and if it is true, recommends only the selected channel to be used.
1347 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1350 AV_PKT_DATA_JP_DUALMONO,
1353 * A list of zero terminated key/value strings. There is no end marker for
1354 * the list, so it is required to rely on the side data size to stop.
1356 AV_PKT_DATA_STRINGS_METADATA,
1359 * Subtitle event position
1367 AV_PKT_DATA_SUBTITLE_POSITION,
1370 * Data found in BlockAdditional element of matroska container. There is
1371 * no end marker for the data, so it is required to rely on the side data
1372 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1375 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1378 * The optional first identifier line of a WebVTT cue.
1380 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1383 * The optional settings (rendering instructions) that immediately
1384 * follow the timestamp specifier of a WebVTT cue.
1386 AV_PKT_DATA_WEBVTT_SETTINGS,
1389 * A list of zero terminated key/value strings. There is no end marker for
1390 * the list, so it is required to rely on the side data size to stop. This
1391 * side data includes updated metadata which appeared in the stream.
1393 AV_PKT_DATA_METADATA_UPDATE,
1396 * MPEGTS stream ID as uint8_t, this is required to pass the stream ID
1397 * information from the demuxer to the corresponding muxer.
1399 AV_PKT_DATA_MPEGTS_STREAM_ID,
1402 * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1403 * should be associated with a video stream and contains data in the form
1404 * of the AVMasteringDisplayMetadata struct.
1406 AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
1409 * This side data should be associated with a video stream and corresponds
1410 * to the AVSphericalMapping structure.
1412 AV_PKT_DATA_SPHERICAL,
1415 * Content light level (based on CTA-861.3). This metadata should be
1416 * associated with a video stream and contains data in the form of the
1417 * AVContentLightMetadata struct.
1419 AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
1422 * ATSC A53 Part 4 Closed Captions. This metadata should be associated with
1423 * a video stream. A53 CC bitstream is stored as uint8_t in AVPacketSideData.data.
1424 * The number of bytes of CC data is AVPacketSideData.size.
1429 * This side data is encryption initialization data.
1430 * The format is not part of ABI, use av_encryption_init_info_* methods to
1433 AV_PKT_DATA_ENCRYPTION_INIT_INFO,
1436 * This side data contains encryption info for how to decrypt the packet.
1437 * The format is not part of ABI, use av_encryption_info_* methods to access.
1439 AV_PKT_DATA_ENCRYPTION_INFO,
1442 * Active Format Description data consisting of a single byte as specified
1443 * in ETSI TS 101 154 using AVActiveFormatDescription enum.
1448 * Producer Reference Time data corresponding to the AVProducerReferenceTime struct,
1449 * usually exported by some encoders (on demand through the prft flag set in the
1450 * AVCodecContext export_side_data field).
1455 * ICC profile data consisting of an opaque octet buffer following the
1456 * format described by ISO 15076-1.
1458 AV_PKT_DATA_ICC_PROFILE,
1461 * The number of side data types.
1462 * This is not part of the public API/ABI in the sense that it may
1463 * change when new side data types are added.
1464 * This must stay the last enum value.
1465 * If its value becomes huge, some code using it
1466 * needs to be updated as it assumes it to be smaller than other limits.
1471 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1473 typedef struct AVPacketSideData {
1476 enum AVPacketSideDataType type;
1480 * This structure stores compressed data. It is typically exported by demuxers
1481 * and then passed as input to decoders, or received as output from encoders and
1482 * then passed to muxers.
1484 * For video, it should typically contain one compressed frame. For audio it may
1485 * contain several compressed frames. Encoders are allowed to output empty
1486 * packets, with no compressed data, containing only side data
1487 * (e.g. to update some stream parameters at the end of encoding).
1489 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1490 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1491 * without libavcodec and libavformat major bump.
1493 * The semantics of data ownership depends on the buf field.
1494 * If it is set, the packet data is dynamically allocated and is
1495 * valid indefinitely until a call to av_packet_unref() reduces the
1496 * reference count to 0.
1498 * If the buf field is not set av_packet_ref() would make a copy instead
1499 * of increasing the reference count.
1501 * The side data is always allocated with av_malloc(), copied by
1502 * av_packet_ref() and freed by av_packet_unref().
1504 * @see av_packet_ref
1505 * @see av_packet_unref
1507 typedef struct AVPacket {
1509 * A reference to the reference-counted buffer where the packet data is
1511 * May be NULL, then the packet data is not reference-counted.
1515 * Presentation timestamp in AVStream->time_base units; the time at which
1516 * the decompressed packet will be presented to the user.
1517 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1518 * pts MUST be larger or equal to dts as presentation cannot happen before
1519 * decompression, unless one wants to view hex dumps. Some formats misuse
1520 * the terms dts and pts/cts to mean something different. Such timestamps
1521 * must be converted to true pts/dts before they are stored in AVPacket.
1525 * Decompression timestamp in AVStream->time_base units; the time at which
1526 * the packet is decompressed.
1527 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1534 * A combination of AV_PKT_FLAG values
1538 * Additional packet data that can be provided by the container.
1539 * Packet can contain several types of side information.
1541 AVPacketSideData *side_data;
1542 int side_data_elems;
1545 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1546 * Equals next_pts - this_pts in presentation order.
1550 int64_t pos; ///< byte position in stream, -1 if unknown
1552 #if FF_API_CONVERGENCE_DURATION
1554 * @deprecated Same as the duration field, but as int64_t. This was required
1555 * for Matroska subtitles, whose duration values could overflow when the
1556 * duration field was still an int.
1558 attribute_deprecated
1559 int64_t convergence_duration;
1562 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1563 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1565 * Flag is used to discard packets which are required to maintain valid
1566 * decoder state but are not required for output and should be dropped
1569 #define AV_PKT_FLAG_DISCARD 0x0004
1571 * The packet comes from a trusted source.
1573 * Otherwise-unsafe constructs such as arbitrary pointers to data
1574 * outside the packet may be followed.
1576 #define AV_PKT_FLAG_TRUSTED 0x0008
1578 * Flag is used to indicate packets that contain frames that can
1579 * be discarded by the decoder. I.e. Non-reference frames.
1581 #define AV_PKT_FLAG_DISPOSABLE 0x0010
1584 enum AVSideDataParamChangeFlags {
1585 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1586 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1587 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1588 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1594 struct AVCodecInternal;
1598 AV_FIELD_PROGRESSIVE,
1599 AV_FIELD_TT, //< Top coded_first, top displayed first
1600 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1601 AV_FIELD_TB, //< Top coded first, bottom displayed first
1602 AV_FIELD_BT, //< Bottom coded first, top displayed first
1606 * main external API structure.
1607 * New fields can be added to the end with minor version bumps.
1608 * Removal, reordering and changes to existing fields require a major
1610 * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1612 * The name string for AVOptions options matches the associated command line
1613 * parameter name and can be found in libavcodec/options_table.h
1614 * The AVOption/command line parameter names differ in some cases from the C
1615 * structure field names for historic reasons or brevity.
1616 * sizeof(AVCodecContext) must not be used outside libav*.
1618 typedef struct AVCodecContext {
1620 * information on struct for av_log
1621 * - set by avcodec_alloc_context3
1623 const AVClass *av_class;
1624 int log_level_offset;
1626 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1627 const struct AVCodec *codec;
1628 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1631 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1632 * This is used to work around some encoder bugs.
1633 * A demuxer should set this to what is stored in the field used to identify the codec.
1634 * If there are multiple such fields in a container then the demuxer should choose the one
1635 * which maximizes the information about the used codec.
1636 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1637 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1638 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1640 * - encoding: Set by user, if not then the default based on codec_id will be used.
1641 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1643 unsigned int codec_tag;
1648 * Private context used for internal data.
1650 * Unlike priv_data, this is not codec-specific. It is used in general
1651 * libavcodec functions.
1653 struct AVCodecInternal *internal;
1656 * Private data of the user, can be used to carry app specific stuff.
1657 * - encoding: Set by user.
1658 * - decoding: Set by user.
1663 * the average bitrate
1664 * - encoding: Set by user; unused for constant quantizer encoding.
1665 * - decoding: Set by user, may be overwritten by libavcodec
1666 * if this info is available in the stream
1671 * number of bits the bitstream is allowed to diverge from the reference.
1672 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1673 * - encoding: Set by user; unused for constant quantizer encoding.
1674 * - decoding: unused
1676 int bit_rate_tolerance;
1679 * Global quality for codecs which cannot change it per frame.
1680 * This should be proportional to MPEG-1/2/4 qscale.
1681 * - encoding: Set by user.
1682 * - decoding: unused
1687 * - encoding: Set by user.
1688 * - decoding: unused
1690 int compression_level;
1691 #define FF_COMPRESSION_DEFAULT -1
1695 * - encoding: Set by user.
1696 * - decoding: Set by user.
1702 * - encoding: Set by user.
1703 * - decoding: Set by user.
1708 * some codecs need / can use extradata like Huffman tables.
1709 * MJPEG: Huffman tables
1710 * rv10: additional flags
1711 * MPEG-4: global headers (they can be in the bitstream or here)
1712 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1713 * than extradata_size to avoid problems if it is read with the bitstream reader.
1714 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1715 * Must be allocated with the av_malloc() family of functions.
1716 * - encoding: Set/allocated/freed by libavcodec.
1717 * - decoding: Set/allocated/freed by user.
1723 * This is the fundamental unit of time (in seconds) in terms
1724 * of which frame timestamps are represented. For fixed-fps content,
1725 * timebase should be 1/framerate and timestamp increments should be
1727 * This often, but not always is the inverse of the frame rate or field rate
1728 * for video. 1/time_base is not the average frame rate if the frame rate is not
1731 * Like containers, elementary streams also can store timestamps, 1/time_base
1732 * is the unit in which these timestamps are specified.
1733 * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1734 * vop_time_increment_resolution and fixed_vop_rate
1735 * (fixed_vop_rate == 0 implies that it is different from the framerate)
1737 * - encoding: MUST be set by user.
1738 * - decoding: the use of this field for decoding is deprecated.
1739 * Use framerate instead.
1741 AVRational time_base;
1744 * For some codecs, the time base is closer to the field rate than the frame rate.
1745 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1746 * if no telecine is used ...
1748 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1750 int ticks_per_frame;
1755 * Encoding: Number of frames delay there will be from the encoder input to
1756 * the decoder output. (we assume the decoder matches the spec)
1757 * Decoding: Number of frames delay in addition to what a standard decoder
1758 * as specified in the spec would produce.
1761 * Number of frames the decoded output will be delayed relative to the
1765 * For encoding, this field is unused (see initial_padding).
1767 * For decoding, this is the number of samples the decoder needs to
1768 * output before the decoder's output is valid. When seeking, you should
1769 * start decoding this many samples prior to your desired seek point.
1771 * - encoding: Set by libavcodec.
1772 * - decoding: Set by libavcodec.
1779 * picture width / height.
1781 * @note Those fields may not match the values of the last
1782 * AVFrame output by avcodec_decode_video2 due frame
1785 * - encoding: MUST be set by user.
1786 * - decoding: May be set by the user before opening the decoder if known e.g.
1787 * from the container. Some decoders will require the dimensions
1788 * to be set by the caller. During decoding, the decoder may
1789 * overwrite those values as required while parsing the data.
1794 * Bitstream width / height, may be different from width/height e.g. when
1795 * the decoded frame is cropped before being output or lowres is enabled.
1797 * @note Those field may not match the value of the last
1798 * AVFrame output by avcodec_receive_frame() due frame
1801 * - encoding: unused
1802 * - decoding: May be set by the user before opening the decoder if known
1803 * e.g. from the container. During decoding, the decoder may
1804 * overwrite those values as required while parsing the data.
1806 int coded_width, coded_height;
1809 * the number of pictures in a group of pictures, or 0 for intra_only
1810 * - encoding: Set by user.
1811 * - decoding: unused
1816 * Pixel format, see AV_PIX_FMT_xxx.
1817 * May be set by the demuxer if known from headers.
1818 * May be overridden by the decoder if it knows better.
1820 * @note This field may not match the value of the last
1821 * AVFrame output by avcodec_receive_frame() due frame
1824 * - encoding: Set by user.
1825 * - decoding: Set by user if known, overridden by libavcodec while
1828 enum AVPixelFormat pix_fmt;
1831 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1832 * decoder to draw a horizontal band. It improves cache usage. Not
1833 * all codecs can do that. You must check the codec capabilities
1835 * When multithreading is used, it may be called from multiple threads
1836 * at the same time; threads might draw different parts of the same AVFrame,
1837 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1839 * The function is also used by hardware acceleration APIs.
1840 * It is called at least once during frame decoding to pass
1841 * the data needed for hardware render.
1842 * In that mode instead of pixel data, AVFrame points to
1843 * a structure specific to the acceleration API. The application
1844 * reads the structure and can change some fields to indicate progress
1846 * - encoding: unused
1847 * - decoding: Set by user.
1848 * @param height the height of the slice
1849 * @param y the y position of the slice
1850 * @param type 1->top field, 2->bottom field, 3->frame
1851 * @param offset offset into the AVFrame.data from which the slice should be read
1853 void (*draw_horiz_band)(struct AVCodecContext *s,
1854 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1855 int y, int type, int height);
1858 * callback to negotiate the pixelFormat
1859 * @param fmt is the list of formats which are supported by the codec,
1860 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1861 * The first is always the native one.
1862 * @note The callback may be called again immediately if initialization for
1863 * the selected (hardware-accelerated) pixel format failed.
1864 * @warning Behavior is undefined if the callback returns a value not
1865 * in the fmt list of formats.
1866 * @return the chosen format
1867 * - encoding: unused
1868 * - decoding: Set by user, if not set the native format will be chosen.
1870 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1873 * maximum number of B-frames between non-B-frames
1874 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1875 * - encoding: Set by user.
1876 * - decoding: unused
1881 * qscale factor between IP and B-frames
1882 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1883 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1884 * - encoding: Set by user.
1885 * - decoding: unused
1887 float b_quant_factor;
1889 #if FF_API_PRIVATE_OPT
1890 /** @deprecated use encoder private options instead */
1891 attribute_deprecated
1892 int b_frame_strategy;
1896 * qscale offset between IP and B-frames
1897 * - encoding: Set by user.
1898 * - decoding: unused
1900 float b_quant_offset;
1903 * Size of the frame reordering buffer in the decoder.
1904 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1905 * - encoding: Set by libavcodec.
1906 * - decoding: Set by libavcodec.
1910 #if FF_API_PRIVATE_OPT
1911 /** @deprecated use encoder private options instead */
1912 attribute_deprecated
1917 * qscale factor between P- and I-frames
1918 * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
1919 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1920 * - encoding: Set by user.
1921 * - decoding: unused
1923 float i_quant_factor;
1926 * qscale offset between P and I-frames
1927 * - encoding: Set by user.
1928 * - decoding: unused
1930 float i_quant_offset;
1933 * luminance masking (0-> disabled)
1934 * - encoding: Set by user.
1935 * - decoding: unused
1940 * temporary complexity masking (0-> disabled)
1941 * - encoding: Set by user.
1942 * - decoding: unused
1944 float temporal_cplx_masking;
1947 * spatial complexity masking (0-> disabled)
1948 * - encoding: Set by user.
1949 * - decoding: unused
1951 float spatial_cplx_masking;
1954 * p block masking (0-> disabled)
1955 * - encoding: Set by user.
1956 * - decoding: unused
1961 * darkness masking (0-> disabled)
1962 * - encoding: Set by user.
1963 * - decoding: unused
1969 * - encoding: Set by libavcodec.
1970 * - decoding: Set by user (or 0).
1974 #if FF_API_PRIVATE_OPT
1975 /** @deprecated use encoder private options instead */
1976 attribute_deprecated
1977 int prediction_method;
1978 #define FF_PRED_LEFT 0
1979 #define FF_PRED_PLANE 1
1980 #define FF_PRED_MEDIAN 2
1984 * slice offsets in the frame in bytes
1985 * - encoding: Set/allocated by libavcodec.
1986 * - decoding: Set/allocated by user (or NULL).
1991 * sample aspect ratio (0 if unknown)
1992 * That is the width of a pixel divided by the height of the pixel.
1993 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1994 * - encoding: Set by user.
1995 * - decoding: Set by libavcodec.
1997 AVRational sample_aspect_ratio;
2000 * motion estimation comparison function
2001 * - encoding: Set by user.
2002 * - decoding: unused
2006 * subpixel motion estimation comparison function
2007 * - encoding: Set by user.
2008 * - decoding: unused
2012 * macroblock comparison function (not supported yet)
2013 * - encoding: Set by user.
2014 * - decoding: unused
2018 * interlaced DCT comparison function
2019 * - encoding: Set by user.
2020 * - decoding: unused
2023 #define FF_CMP_SAD 0
2024 #define FF_CMP_SSE 1
2025 #define FF_CMP_SATD 2
2026 #define FF_CMP_DCT 3
2027 #define FF_CMP_PSNR 4
2028 #define FF_CMP_BIT 5
2030 #define FF_CMP_ZERO 7
2031 #define FF_CMP_VSAD 8
2032 #define FF_CMP_VSSE 9
2033 #define FF_CMP_NSSE 10
2034 #define FF_CMP_W53 11
2035 #define FF_CMP_W97 12
2036 #define FF_CMP_DCTMAX 13
2037 #define FF_CMP_DCT264 14
2038 #define FF_CMP_MEDIAN_SAD 15
2039 #define FF_CMP_CHROMA 256
2042 * ME diamond size & shape
2043 * - encoding: Set by user.
2044 * - decoding: unused
2049 * amount of previous MV predictors (2a+1 x 2a+1 square)
2050 * - encoding: Set by user.
2051 * - decoding: unused
2053 int last_predictor_count;
2055 #if FF_API_PRIVATE_OPT
2056 /** @deprecated use encoder private options instead */
2057 attribute_deprecated
2062 * motion estimation prepass comparison function
2063 * - encoding: Set by user.
2064 * - decoding: unused
2069 * ME prepass diamond size & shape
2070 * - encoding: Set by user.
2071 * - decoding: unused
2077 * - encoding: Set by user.
2078 * - decoding: unused
2080 int me_subpel_quality;
2083 * maximum motion estimation search range in subpel units
2084 * If 0 then no limit.
2086 * - encoding: Set by user.
2087 * - decoding: unused
2093 * - encoding: unused
2094 * - decoding: Set by user.
2097 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2098 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
2099 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2102 * macroblock decision mode
2103 * - encoding: Set by user.
2104 * - decoding: unused
2107 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2108 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2109 #define FF_MB_DECISION_RD 2 ///< rate distortion
2112 * custom intra quantization matrix
2113 * Must be allocated with the av_malloc() family of functions, and will be freed in
2114 * avcodec_free_context().
2115 * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
2116 * - decoding: Set/allocated/freed by libavcodec.
2118 uint16_t *intra_matrix;
2121 * custom inter quantization matrix
2122 * Must be allocated with the av_malloc() family of functions, and will be freed in
2123 * avcodec_free_context().
2124 * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
2125 * - decoding: Set/allocated/freed by libavcodec.
2127 uint16_t *inter_matrix;
2129 #if FF_API_PRIVATE_OPT
2130 /** @deprecated use encoder private options instead */
2131 attribute_deprecated
2132 int scenechange_threshold;
2134 /** @deprecated use encoder private options instead */
2135 attribute_deprecated
2136 int noise_reduction;
2140 * precision of the intra DC coefficient - 8
2141 * - encoding: Set by user.
2142 * - decoding: Set by libavcodec
2144 int intra_dc_precision;
2147 * Number of macroblock rows at the top which are skipped.
2148 * - encoding: unused
2149 * - decoding: Set by user.
2154 * Number of macroblock rows at the bottom which are skipped.
2155 * - encoding: unused
2156 * - decoding: Set by user.
2161 * minimum MB Lagrange multiplier
2162 * - encoding: Set by user.
2163 * - decoding: unused
2168 * maximum MB Lagrange multiplier
2169 * - encoding: Set by user.
2170 * - decoding: unused
2174 #if FF_API_PRIVATE_OPT
2176 * @deprecated use encoder private options instead
2178 attribute_deprecated
2179 int me_penalty_compensation;
2183 * - encoding: Set by user.
2184 * - decoding: unused
2188 #if FF_API_PRIVATE_OPT
2189 /** @deprecated use encoder private options instead */
2190 attribute_deprecated
2196 * - encoding: Set by user.
2197 * - decoding: unused
2202 * number of reference frames
2203 * - encoding: Set by user.
2204 * - decoding: Set by lavc.
2208 #if FF_API_PRIVATE_OPT
2209 /** @deprecated use encoder private options instead */
2210 attribute_deprecated
2215 * Note: Value depends upon the compare function used for fullpel ME.
2216 * - encoding: Set by user.
2217 * - decoding: unused
2221 #if FF_API_PRIVATE_OPT
2222 /** @deprecated use encoder private options instead */
2223 attribute_deprecated
2228 * Chromaticity coordinates of the source primaries.
2229 * - encoding: Set by user
2230 * - decoding: Set by libavcodec
2232 enum AVColorPrimaries color_primaries;
2235 * Color Transfer Characteristic.
2236 * - encoding: Set by user
2237 * - decoding: Set by libavcodec
2239 enum AVColorTransferCharacteristic color_trc;
2242 * YUV colorspace type.
2243 * - encoding: Set by user
2244 * - decoding: Set by libavcodec
2246 enum AVColorSpace colorspace;
2249 * MPEG vs JPEG YUV range.
2250 * - encoding: Set by user
2251 * - decoding: Set by libavcodec
2253 enum AVColorRange color_range;
2256 * This defines the location of chroma samples.
2257 * - encoding: Set by user
2258 * - decoding: Set by libavcodec
2260 enum AVChromaLocation chroma_sample_location;
2264 * Indicates number of picture subdivisions. Used for parallelized
2266 * - encoding: Set by user
2267 * - decoding: unused
2272 * - encoding: set by libavcodec
2273 * - decoding: Set by user.
2275 enum AVFieldOrder field_order;
2278 int sample_rate; ///< samples per second
2279 int channels; ///< number of audio channels
2282 * audio sample format
2283 * - encoding: Set by user.
2284 * - decoding: Set by libavcodec.
2286 enum AVSampleFormat sample_fmt; ///< sample format
2288 /* The following data should not be initialized. */
2290 * Number of samples per channel in an audio frame.
2292 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2293 * except the last must contain exactly frame_size samples per channel.
2294 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2295 * frame size is not restricted.
2296 * - decoding: may be set by some decoders to indicate constant frame size
2301 * Frame counter, set by libavcodec.
2303 * - decoding: total number of frames returned from the decoder so far.
2304 * - encoding: total number of frames passed to the encoder so far.
2306 * @note the counter is not incremented if encoding/decoding resulted in
2312 * number of bytes per packet if constant and known or 0
2313 * Used by some WAV based audio codecs.
2318 * Audio cutoff bandwidth (0 means "automatic")
2319 * - encoding: Set by user.
2320 * - decoding: unused
2325 * Audio channel layout.
2326 * - encoding: set by user.
2327 * - decoding: set by user, may be overwritten by libavcodec.
2329 uint64_t channel_layout;
2332 * Request decoder to use this channel layout if it can (0 for default)
2333 * - encoding: unused
2334 * - decoding: Set by user.
2336 uint64_t request_channel_layout;
2339 * Type of service that the audio stream conveys.
2340 * - encoding: Set by user.
2341 * - decoding: Set by libavcodec.
2343 enum AVAudioServiceType audio_service_type;
2346 * desired sample format
2347 * - encoding: Not used.
2348 * - decoding: Set by user.
2349 * Decoder will decode to this format if it can.
2351 enum AVSampleFormat request_sample_fmt;
2354 * This callback is called at the beginning of each frame to get data
2355 * buffer(s) for it. There may be one contiguous buffer for all the data or
2356 * there may be a buffer per each data plane or anything in between. What
2357 * this means is, you may set however many entries in buf[] you feel necessary.
2358 * Each buffer must be reference-counted using the AVBuffer API (see description
2361 * The following fields will be set in the frame before this callback is
2364 * - width, height (video only)
2365 * - sample_rate, channel_layout, nb_samples (audio only)
2366 * Their values may differ from the corresponding values in
2367 * AVCodecContext. This callback must use the frame values, not the codec
2368 * context values, to calculate the required buffer size.
2370 * This callback must fill the following fields in the frame:
2374 * * if the data is planar audio with more than 8 channels, then this
2375 * callback must allocate and fill extended_data to contain all pointers
2376 * to all data planes. data[] must hold as many pointers as it can.
2377 * extended_data must be allocated with av_malloc() and will be freed in
2379 * * otherwise extended_data must point to data
2380 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2381 * the frame's data and extended_data pointers must be contained in these. That
2382 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2383 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2384 * and av_buffer_ref().
2385 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2386 * this callback and filled with the extra buffers if there are more
2387 * buffers than buf[] can hold. extended_buf will be freed in
2390 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2391 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2394 * Each data plane must be aligned to the maximum required by the target
2397 * @see avcodec_default_get_buffer2()
2401 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2402 * (read and/or written to if it is writable) later by libavcodec.
2404 * avcodec_align_dimensions2() should be used to find the required width and
2405 * height, as they normally need to be rounded up to the next multiple of 16.
2407 * Some decoders do not support linesizes changing between frames.
2409 * If frame multithreading is used and thread_safe_callbacks is set,
2410 * this callback may be called from a different thread, but not from more
2411 * than one at once. Does not need to be reentrant.
2413 * @see avcodec_align_dimensions2()
2417 * Decoders request a buffer of a particular size by setting
2418 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2419 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2420 * to a smaller value in the output frame.
2422 * As a convenience, av_samples_get_buffer_size() and
2423 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2424 * functions to find the required data size and to fill data pointers and
2425 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2426 * since all planes must be the same size.
2428 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2430 * - encoding: unused
2431 * - decoding: Set by libavcodec, user can override.
2433 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2436 * If non-zero, the decoded audio and video frames returned from
2437 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2438 * and are valid indefinitely. The caller must free them with
2439 * av_frame_unref() when they are not needed anymore.
2440 * Otherwise, the decoded frames must not be freed by the caller and are
2441 * only valid until the next decode call.
2443 * This is always automatically enabled if avcodec_receive_frame() is used.
2445 * - encoding: unused
2446 * - decoding: set by the caller before avcodec_open2().
2448 attribute_deprecated
2449 int refcounted_frames;
2451 /* - encoding parameters */
2452 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2453 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2457 * - encoding: Set by user.
2458 * - decoding: unused
2464 * - encoding: Set by user.
2465 * - decoding: unused
2470 * maximum quantizer difference between frames
2471 * - encoding: Set by user.
2472 * - decoding: unused
2477 * decoder bitstream buffer size
2478 * - encoding: Set by user.
2479 * - decoding: unused
2484 * ratecontrol override, see RcOverride
2485 * - encoding: Allocated/set/freed by user.
2486 * - decoding: unused
2488 int rc_override_count;
2489 RcOverride *rc_override;
2493 * - encoding: Set by user.
2494 * - decoding: Set by user, may be overwritten by libavcodec.
2496 int64_t rc_max_rate;
2500 * - encoding: Set by user.
2501 * - decoding: unused
2503 int64_t rc_min_rate;
2506 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2507 * - encoding: Set by user.
2508 * - decoding: unused.
2510 float rc_max_available_vbv_use;
2513 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2514 * - encoding: Set by user.
2515 * - decoding: unused.
2517 float rc_min_vbv_overflow_use;
2520 * Number of bits which should be loaded into the rc buffer before decoding starts.
2521 * - encoding: Set by user.
2522 * - decoding: unused
2524 int rc_initial_buffer_occupancy;
2526 #if FF_API_CODER_TYPE
2527 #define FF_CODER_TYPE_VLC 0
2528 #define FF_CODER_TYPE_AC 1
2529 #define FF_CODER_TYPE_RAW 2
2530 #define FF_CODER_TYPE_RLE 3
2532 * @deprecated use encoder private options instead
2534 attribute_deprecated
2536 #endif /* FF_API_CODER_TYPE */
2538 #if FF_API_PRIVATE_OPT
2539 /** @deprecated use encoder private options instead */
2540 attribute_deprecated
2544 #if FF_API_PRIVATE_OPT
2545 /** @deprecated use encoder private options instead */
2546 attribute_deprecated
2547 int frame_skip_threshold;
2549 /** @deprecated use encoder private options instead */
2550 attribute_deprecated
2551 int frame_skip_factor;
2553 /** @deprecated use encoder private options instead */
2554 attribute_deprecated
2557 /** @deprecated use encoder private options instead */
2558 attribute_deprecated
2560 #endif /* FF_API_PRIVATE_OPT */
2563 * trellis RD quantization
2564 * - encoding: Set by user.
2565 * - decoding: unused
2569 #if FF_API_PRIVATE_OPT
2570 /** @deprecated use encoder private options instead */
2571 attribute_deprecated
2572 int min_prediction_order;
2574 /** @deprecated use encoder private options instead */
2575 attribute_deprecated
2576 int max_prediction_order;
2578 /** @deprecated use encoder private options instead */
2579 attribute_deprecated
2580 int64_t timecode_frame_start;
2583 #if FF_API_RTP_CALLBACK
2585 * @deprecated unused
2587 /* The RTP callback: This function is called */
2588 /* every time the encoder has a packet to send. */
2589 /* It depends on the encoder if the data starts */
2590 /* with a Start Code (it should). H.263 does. */
2591 /* mb_nb contains the number of macroblocks */
2592 /* encoded in the RTP payload. */
2593 attribute_deprecated
2594 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2597 #if FF_API_PRIVATE_OPT
2598 /** @deprecated use encoder private options instead */
2599 attribute_deprecated
2600 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2601 /* do its best to deliver a chunk with size */
2602 /* below rtp_payload_size, the chunk will start */
2603 /* with a start code on some codecs like H.263. */
2604 /* This doesn't take account of any particular */
2605 /* headers inside the transmitted RTP payload. */
2608 #if FF_API_STAT_BITS
2609 /* statistics, used for 2-pass encoding */
2610 attribute_deprecated
2612 attribute_deprecated
2614 attribute_deprecated
2616 attribute_deprecated
2618 attribute_deprecated
2620 attribute_deprecated
2622 attribute_deprecated
2624 attribute_deprecated
2627 /** @deprecated this field is unused */
2628 attribute_deprecated
2633 * pass1 encoding statistics output buffer
2634 * - encoding: Set by libavcodec.
2635 * - decoding: unused
2640 * pass2 encoding statistics input buffer
2641 * Concatenated stuff from stats_out of pass1 should be placed here.
2642 * - encoding: Allocated/set/freed by user.
2643 * - decoding: unused
2648 * Work around bugs in encoders which sometimes cannot be detected automatically.
2649 * - encoding: Set by user
2650 * - decoding: Set by user
2652 int workaround_bugs;
2653 #define FF_BUG_AUTODETECT 1 ///< autodetection
2654 #define FF_BUG_XVID_ILACE 4
2655 #define FF_BUG_UMP4 8
2656 #define FF_BUG_NO_PADDING 16
2657 #define FF_BUG_AMV 32
2658 #define FF_BUG_QPEL_CHROMA 64
2659 #define FF_BUG_STD_QPEL 128
2660 #define FF_BUG_QPEL_CHROMA2 256
2661 #define FF_BUG_DIRECT_BLOCKSIZE 512
2662 #define FF_BUG_EDGE 1024
2663 #define FF_BUG_HPEL_CHROMA 2048
2664 #define FF_BUG_DC_CLIP 4096
2665 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2666 #define FF_BUG_TRUNCATED 16384
2667 #define FF_BUG_IEDGE 32768
2670 * strictly follow the standard (MPEG-4, ...).
2671 * - encoding: Set by user.
2672 * - decoding: Set by user.
2673 * Setting this to STRICT or higher means the encoder and decoder will
2674 * generally do stupid things, whereas setting it to unofficial or lower
2675 * will mean the encoder might produce output that is not supported by all
2676 * spec-compliant decoders. Decoders don't differentiate between normal,
2677 * unofficial and experimental (that is, they always try to decode things
2678 * when they can) unless they are explicitly asked to behave stupidly
2679 * (=strictly conform to the specs)
2681 int strict_std_compliance;
2682 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2683 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2684 #define FF_COMPLIANCE_NORMAL 0
2685 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2686 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2689 * error concealment flags
2690 * - encoding: unused
2691 * - decoding: Set by user.
2693 int error_concealment;
2694 #define FF_EC_GUESS_MVS 1
2695 #define FF_EC_DEBLOCK 2
2696 #define FF_EC_FAVOR_INTER 256
2700 * - encoding: Set by user.
2701 * - decoding: Set by user.
2704 #define FF_DEBUG_PICT_INFO 1
2705 #define FF_DEBUG_RC 2
2706 #define FF_DEBUG_BITSTREAM 4
2707 #define FF_DEBUG_MB_TYPE 8
2708 #define FF_DEBUG_QP 16
2711 * @deprecated this option does nothing
2713 #define FF_DEBUG_MV 32
2715 #define FF_DEBUG_DCT_COEFF 0x00000040
2716 #define FF_DEBUG_SKIP 0x00000080
2717 #define FF_DEBUG_STARTCODE 0x00000100
2718 #define FF_DEBUG_ER 0x00000400
2719 #define FF_DEBUG_MMCO 0x00000800
2720 #define FF_DEBUG_BUGS 0x00001000
2722 #define FF_DEBUG_VIS_QP 0x00002000
2723 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2725 #define FF_DEBUG_BUFFERS 0x00008000
2726 #define FF_DEBUG_THREADS 0x00010000
2727 #define FF_DEBUG_GREEN_MD 0x00800000
2728 #define FF_DEBUG_NOMC 0x01000000
2733 * - encoding: Set by user.
2734 * - decoding: Set by user.
2737 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
2738 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
2739 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
2743 * Error recognition; may misdetect some more or less valid parts as errors.
2744 * - encoding: unused
2745 * - decoding: Set by user.
2747 int err_recognition;
2750 * Verify checksums embedded in the bitstream (could be of either encoded or
2751 * decoded data, depending on the codec) and print an error message on mismatch.
2752 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2753 * decoder returning an error.
2755 #define AV_EF_CRCCHECK (1<<0)
2756 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2757 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2758 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2760 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2761 #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
2762 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2763 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2767 * opaque 64-bit number (generally a PTS) that will be reordered and
2768 * output in AVFrame.reordered_opaque
2769 * - encoding: Set by libavcodec to the reordered_opaque of the input
2770 * frame corresponding to the last returned packet. Only
2771 * supported by encoders with the
2772 * AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability.
2773 * - decoding: Set by user.
2775 int64_t reordered_opaque;
2778 * Hardware accelerator in use
2779 * - encoding: unused.
2780 * - decoding: Set by libavcodec
2782 const struct AVHWAccel *hwaccel;
2785 * Hardware accelerator context.
2786 * For some hardware accelerators, a global context needs to be
2787 * provided by the user. In that case, this holds display-dependent
2788 * data FFmpeg cannot instantiate itself. Please refer to the
2789 * FFmpeg HW accelerator documentation to know how to fill this
2790 * is. e.g. for VA API, this is a struct vaapi_context.
2791 * - encoding: unused
2792 * - decoding: Set by user
2794 void *hwaccel_context;
2798 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2799 * - decoding: unused
2801 uint64_t error[AV_NUM_DATA_POINTERS];
2804 * DCT algorithm, see FF_DCT_* below
2805 * - encoding: Set by user.
2806 * - decoding: unused
2809 #define FF_DCT_AUTO 0
2810 #define FF_DCT_FASTINT 1
2811 #define FF_DCT_INT 2
2812 #define FF_DCT_MMX 3
2813 #define FF_DCT_ALTIVEC 5
2814 #define FF_DCT_FAAN 6
2817 * IDCT algorithm, see FF_IDCT_* below.
2818 * - encoding: Set by user.
2819 * - decoding: Set by user.
2822 #define FF_IDCT_AUTO 0
2823 #define FF_IDCT_INT 1
2824 #define FF_IDCT_SIMPLE 2
2825 #define FF_IDCT_SIMPLEMMX 3
2826 #define FF_IDCT_ARM 7
2827 #define FF_IDCT_ALTIVEC 8
2828 #define FF_IDCT_SIMPLEARM 10
2829 #define FF_IDCT_XVID 14
2830 #define FF_IDCT_SIMPLEARMV5TE 16
2831 #define FF_IDCT_SIMPLEARMV6 17
2832 #define FF_IDCT_FAAN 20
2833 #define FF_IDCT_SIMPLENEON 22
2834 #define FF_IDCT_NONE 24 /* Used by XvMC to extract IDCT coefficients with FF_IDCT_PERM_NONE */
2835 #define FF_IDCT_SIMPLEAUTO 128
2838 * bits per sample/pixel from the demuxer (needed for huffyuv).
2839 * - encoding: Set by libavcodec.
2840 * - decoding: Set by user.
2842 int bits_per_coded_sample;
2845 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2846 * - encoding: set by user.
2847 * - decoding: set by libavcodec.
2849 int bits_per_raw_sample;
2853 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2854 * - encoding: unused
2855 * - decoding: Set by user.
2860 #if FF_API_CODED_FRAME
2862 * the picture in the bitstream
2863 * - encoding: Set by libavcodec.
2864 * - decoding: unused
2866 * @deprecated use the quality factor packet side data instead
2868 attribute_deprecated AVFrame *coded_frame;
2873 * is used to decide how many independent tasks should be passed to execute()
2874 * - encoding: Set by user.
2875 * - decoding: Set by user.
2880 * Which multithreading methods to use.
2881 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2882 * so clients which cannot provide future frames should not use it.
2884 * - encoding: Set by user, otherwise the default is used.
2885 * - decoding: Set by user, otherwise the default is used.
2888 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2889 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2892 * Which multithreading methods are in use by the codec.
2893 * - encoding: Set by libavcodec.
2894 * - decoding: Set by libavcodec.
2896 int active_thread_type;
2899 * Set by the client if its custom get_buffer() callback can be called
2900 * synchronously from another thread, which allows faster multithreaded decoding.
2901 * draw_horiz_band() will be called from other threads regardless of this setting.
2902 * Ignored if the default get_buffer() is used.
2903 * - encoding: Set by user.
2904 * - decoding: Set by user.
2906 int thread_safe_callbacks;
2909 * The codec may call this to execute several independent things.
2910 * It will return only after finishing all tasks.
2911 * The user may replace this with some multithreaded implementation,
2912 * the default implementation will execute the parts serially.
2913 * @param count the number of things to execute
2914 * - encoding: Set by libavcodec, user can override.
2915 * - decoding: Set by libavcodec, user can override.
2917 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2920 * The codec may call this to execute several independent things.
2921 * It will return only after finishing all tasks.
2922 * The user may replace this with some multithreaded implementation,
2923 * the default implementation will execute the parts serially.
2924 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2925 * @param c context passed also to func
2926 * @param count the number of things to execute
2927 * @param arg2 argument passed unchanged to func
2928 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2929 * @param func function that will be called count times, with jobnr from 0 to count-1.
2930 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2931 * two instances of func executing at the same time will have the same threadnr.
2932 * @return always 0 currently, but code should handle a future improvement where when any call to func
2933 * returns < 0 no further calls to func may be done and < 0 is returned.
2934 * - encoding: Set by libavcodec, user can override.
2935 * - decoding: Set by libavcodec, user can override.
2937 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2940 * noise vs. sse weight for the nsse comparison function
2941 * - encoding: Set by user.
2942 * - decoding: unused
2948 * - encoding: Set by user.
2949 * - decoding: Set by libavcodec.
2952 #define FF_PROFILE_UNKNOWN -99
2953 #define FF_PROFILE_RESERVED -100
2955 #define FF_PROFILE_AAC_MAIN 0
2956 #define FF_PROFILE_AAC_LOW 1
2957 #define FF_PROFILE_AAC_SSR 2
2958 #define FF_PROFILE_AAC_LTP 3
2959 #define FF_PROFILE_AAC_HE 4
2960 #define FF_PROFILE_AAC_HE_V2 28
2961 #define FF_PROFILE_AAC_LD 22
2962 #define FF_PROFILE_AAC_ELD 38
2963 #define FF_PROFILE_MPEG2_AAC_LOW 128
2964 #define FF_PROFILE_MPEG2_AAC_HE 131
2966 #define FF_PROFILE_DNXHD 0
2967 #define FF_PROFILE_DNXHR_LB 1
2968 #define FF_PROFILE_DNXHR_SQ 2
2969 #define FF_PROFILE_DNXHR_HQ 3
2970 #define FF_PROFILE_DNXHR_HQX 4
2971 #define FF_PROFILE_DNXHR_444 5
2973 #define FF_PROFILE_DTS 20
2974 #define FF_PROFILE_DTS_ES 30
2975 #define FF_PROFILE_DTS_96_24 40
2976 #define FF_PROFILE_DTS_HD_HRA 50
2977 #define FF_PROFILE_DTS_HD_MA 60
2978 #define FF_PROFILE_DTS_EXPRESS 70
2980 #define FF_PROFILE_MPEG2_422 0
2981 #define FF_PROFILE_MPEG2_HIGH 1
2982 #define FF_PROFILE_MPEG2_SS 2
2983 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2984 #define FF_PROFILE_MPEG2_MAIN 4
2985 #define FF_PROFILE_MPEG2_SIMPLE 5
2987 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2988 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2990 #define FF_PROFILE_H264_BASELINE 66
2991 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2992 #define FF_PROFILE_H264_MAIN 77
2993 #define FF_PROFILE_H264_EXTENDED 88
2994 #define FF_PROFILE_H264_HIGH 100
2995 #define FF_PROFILE_H264_HIGH_10 110
2996 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2997 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
2998 #define FF_PROFILE_H264_HIGH_422 122
2999 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3000 #define FF_PROFILE_H264_STEREO_HIGH 128
3001 #define FF_PROFILE_H264_HIGH_444 144
3002 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3003 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3004 #define FF_PROFILE_H264_CAVLC_444 44
3006 #define FF_PROFILE_VC1_SIMPLE 0
3007 #define FF_PROFILE_VC1_MAIN 1
3008 #define FF_PROFILE_VC1_COMPLEX 2
3009 #define FF_PROFILE_VC1_ADVANCED 3
3011 #define FF_PROFILE_MPEG4_SIMPLE 0
3012 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3013 #define FF_PROFILE_MPEG4_CORE 2
3014 #define FF_PROFILE_MPEG4_MAIN 3
3015 #define FF_PROFILE_MPEG4_N_BIT 4
3016 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3017 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3018 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3019 #define FF_PROFILE_MPEG4_HYBRID 8
3020 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3021 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3022 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3023 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3024 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3025 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3026 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3028 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
3029 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
3030 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
3031 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3032 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3034 #define FF_PROFILE_VP9_0 0
3035 #define FF_PROFILE_VP9_1 1
3036 #define FF_PROFILE_VP9_2 2
3037 #define FF_PROFILE_VP9_3 3
3039 #define FF_PROFILE_HEVC_MAIN 1
3040 #define FF_PROFILE_HEVC_MAIN_10 2
3041 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3042 #define FF_PROFILE_HEVC_REXT 4
3044 #define FF_PROFILE_AV1_MAIN 0
3045 #define FF_PROFILE_AV1_HIGH 1
3046 #define FF_PROFILE_AV1_PROFESSIONAL 2
3048 #define FF_PROFILE_MJPEG_HUFFMAN_BASELINE_DCT 0xc0
3049 #define FF_PROFILE_MJPEG_HUFFMAN_EXTENDED_SEQUENTIAL_DCT 0xc1
3050 #define FF_PROFILE_MJPEG_HUFFMAN_PROGRESSIVE_DCT 0xc2
3051 #define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
3052 #define FF_PROFILE_MJPEG_JPEG_LS 0xf7
3054 #define FF_PROFILE_SBC_MSBC 1
3056 #define FF_PROFILE_PRORES_PROXY 0
3057 #define FF_PROFILE_PRORES_LT 1
3058 #define FF_PROFILE_PRORES_STANDARD 2
3059 #define FF_PROFILE_PRORES_HQ 3
3060 #define FF_PROFILE_PRORES_4444 4
3061 #define FF_PROFILE_PRORES_XQ 5
3063 #define FF_PROFILE_ARIB_PROFILE_A 0
3064 #define FF_PROFILE_ARIB_PROFILE_C 1
3068 * - encoding: Set by user.
3069 * - decoding: Set by libavcodec.
3072 #define FF_LEVEL_UNKNOWN -99
3075 * Skip loop filtering for selected frames.
3076 * - encoding: unused
3077 * - decoding: Set by user.
3079 enum AVDiscard skip_loop_filter;
3082 * Skip IDCT/dequantization for selected frames.
3083 * - encoding: unused
3084 * - decoding: Set by user.
3086 enum AVDiscard skip_idct;
3089 * Skip decoding for selected frames.
3090 * - encoding: unused
3091 * - decoding: Set by user.
3093 enum AVDiscard skip_frame;
3096 * Header containing style information for text subtitles.
3097 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3098 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3099 * the Format line following. It shouldn't include any Dialogue line.
3100 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3101 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3103 uint8_t *subtitle_header;
3104 int subtitle_header_size;
3106 #if FF_API_VBV_DELAY
3108 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3109 * Used for compliant TS muxing.
3110 * - encoding: Set by libavcodec.
3111 * - decoding: unused.
3112 * @deprecated this value is now exported as a part of
3113 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3115 attribute_deprecated
3119 #if FF_API_SIDEDATA_ONLY_PKT
3121 * Encoding only and set by default. Allow encoders to output packets
3122 * that do not contain any encoded data, only side data.
3124 * Some encoders need to output such packets, e.g. to update some stream
3125 * parameters at the end of encoding.
3127 * @deprecated this field disables the default behaviour and
3128 * it is kept only for compatibility.
3130 attribute_deprecated
3131 int side_data_only_packets;
3135 * Audio only. The number of "priming" samples (padding) inserted by the
3136 * encoder at the beginning of the audio. I.e. this number of leading
3137 * decoded samples must be discarded by the caller to get the original audio
3138 * without leading padding.
3140 * - decoding: unused
3141 * - encoding: Set by libavcodec. The timestamps on the output packets are
3142 * adjusted by the encoder so that they always refer to the
3143 * first sample of the data actually contained in the packet,
3144 * including any added padding. E.g. if the timebase is
3145 * 1/samplerate and the timestamp of the first input sample is
3146 * 0, the timestamp of the first output packet will be
3149 int initial_padding;
3152 * - decoding: For codecs that store a framerate value in the compressed
3153 * bitstream, the decoder may export it here. { 0, 1} when
3155 * - encoding: May be used to signal the framerate of CFR content to an
3158 AVRational framerate;
3161 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3162 * - encoding: unused.
3163 * - decoding: Set by libavcodec before calling get_format()
3165 enum AVPixelFormat sw_pix_fmt;
3168 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3169 * - encoding unused.
3170 * - decoding set by user.
3172 AVRational pkt_timebase;
3176 * - encoding: unused.
3177 * - decoding: set by libavcodec.
3179 const AVCodecDescriptor *codec_descriptor;
3183 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3184 * - encoding: unused
3185 * - decoding: Set by user.
3191 * Current statistics for PTS correction.
3192 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3193 * - encoding: unused
3195 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3196 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3197 int64_t pts_correction_last_pts; /// PTS of the last frame
3198 int64_t pts_correction_last_dts; /// DTS of the last frame
3201 * Character encoding of the input subtitles file.
3202 * - decoding: set by user
3203 * - encoding: unused
3208 * Subtitles character encoding mode. Formats or codecs might be adjusting
3209 * this setting (if they are doing the conversion themselves for instance).
3210 * - decoding: set by libavcodec
3211 * - encoding: unused
3213 int sub_charenc_mode;
3214 #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)
3215 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3216 #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
3217 #define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for valid UTF-8
3220 * Skip processing alpha if supported by codec.
3221 * Note that if the format uses pre-multiplied alpha (common with VP6,
3222 * and recommended due to better video quality/compression)
3223 * the image will look as if alpha-blended onto a black background.
3224 * However for formats that do not use pre-multiplied alpha
3225 * there might be serious artefacts (though e.g. libswscale currently
3226 * assumes pre-multiplied alpha anyway).
3228 * - decoding: set by user
3229 * - encoding: unused
3234 * Number of samples to skip after a discontinuity
3235 * - decoding: unused
3236 * - encoding: set by libavcodec
3240 #if !FF_API_DEBUG_MV
3242 * debug motion vectors
3243 * - encoding: Set by user.
3244 * - decoding: Set by user.
3247 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3248 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3249 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3253 * custom intra quantization matrix
3254 * - encoding: Set by user, can be NULL.
3255 * - decoding: unused.
3257 uint16_t *chroma_intra_matrix;
3260 * dump format separator.
3261 * can be ", " or "\n " or anything else
3262 * - encoding: Set by user.
3263 * - decoding: Set by user.
3265 uint8_t *dump_separator;
3268 * ',' separated list of allowed decoders.
3269 * If NULL then all are allowed
3270 * - encoding: unused
3271 * - decoding: set by user
3273 char *codec_whitelist;
3276 * Properties of the stream that gets decoded
3277 * - encoding: unused
3278 * - decoding: set by libavcodec
3280 unsigned properties;
3281 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3282 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3285 * Additional data associated with the entire coded stream.
3287 * - decoding: unused
3288 * - encoding: may be set by libavcodec after avcodec_open2().
3290 AVPacketSideData *coded_side_data;
3291 int nb_coded_side_data;
3294 * A reference to the AVHWFramesContext describing the input (for encoding)
3295 * or output (decoding) frames. The reference is set by the caller and
3296 * afterwards owned (and freed) by libavcodec - it should never be read by
3297 * the caller after being set.
3299 * - decoding: This field should be set by the caller from the get_format()
3300 * callback. The previous reference (if any) will always be
3301 * unreffed by libavcodec before the get_format() call.
3303 * If the default get_buffer2() is used with a hwaccel pixel
3304 * format, then this AVHWFramesContext will be used for
3305 * allocating the frame buffers.
3307 * - encoding: For hardware encoders configured to use a hwaccel pixel
3308 * format, this field should be set by the caller to a reference
3309 * to the AVHWFramesContext describing input frames.
3310 * AVHWFramesContext.format must be equal to
3311 * AVCodecContext.pix_fmt.
3313 * This field should be set before avcodec_open2() is called.
3315 AVBufferRef *hw_frames_ctx;
3318 * Control the form of AVSubtitle.rects[N]->ass
3319 * - decoding: set by user
3320 * - encoding: unused
3322 int sub_text_format;
3323 #define FF_SUB_TEXT_FMT_ASS 0
3324 #if FF_API_ASS_TIMING
3325 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3329 * Audio only. The amount of padding (in samples) appended by the encoder to
3330 * the end of the audio. I.e. this number of decoded samples must be
3331 * discarded by the caller from the end of the stream to get the original
3332 * audio without any trailing padding.
3334 * - decoding: unused
3335 * - encoding: unused
3337 int trailing_padding;
3340 * The number of pixels per image to maximally accept.
3342 * - decoding: set by user
3343 * - encoding: set by user
3348 * A reference to the AVHWDeviceContext describing the device which will
3349 * be used by a hardware encoder/decoder. The reference is set by the
3350 * caller and afterwards owned (and freed) by libavcodec.
3352 * This should be used if either the codec device does not require
3353 * hardware frames or any that are used are to be allocated internally by
3354 * libavcodec. If the user wishes to supply any of the frames used as
3355 * encoder input or decoder output then hw_frames_ctx should be used
3356 * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3357 * field will be ignored while decoding the associated stream segment, but
3358 * may again be used on a following one after another get_format() call.
3360 * For both encoders and decoders this field should be set before
3361 * avcodec_open2() is called and must not be written to thereafter.
3363 * Note that some decoders may require this field to be set initially in
3364 * order to support hw_frames_ctx at all - in that case, all frames
3365 * contexts used must be created on the same device.
3367 AVBufferRef *hw_device_ctx;
3370 * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3371 * decoding (if active).
3372 * - encoding: unused
3373 * - decoding: Set by user (either before avcodec_open2(), or in the
3374 * AVCodecContext.get_format callback)
3379 * Video decoding only. Certain video codecs support cropping, meaning that
3380 * only a sub-rectangle of the decoded frame is intended for display. This
3381 * option controls how cropping is handled by libavcodec.
3383 * When set to 1 (the default), libavcodec will apply cropping internally.
3384 * I.e. it will modify the output frame width/height fields and offset the
3385 * data pointers (only by as much as possible while preserving alignment, or
3386 * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3387 * the frames output by the decoder refer only to the cropped area. The
3388 * crop_* fields of the output frames will be zero.
3390 * When set to 0, the width/height fields of the output frames will be set
3391 * to the coded dimensions and the crop_* fields will describe the cropping
3392 * rectangle. Applying the cropping is left to the caller.
3394 * @warning When hardware acceleration with opaque output frames is used,
3395 * libavcodec is unable to apply cropping from the top/left border.
3397 * @note when this option is set to zero, the width/height fields of the
3398 * AVCodecContext and output AVFrames have different meanings. The codec
3399 * context fields store display dimensions (with the coded dimensions in
3400 * coded_width/height), while the frame fields store the coded dimensions
3401 * (with the display dimensions being determined by the crop_* fields).
3406 * Video decoding only. Sets the number of extra hardware frames which
3407 * the decoder will allocate for use by the caller. This must be set
3408 * before avcodec_open2() is called.
3410 * Some hardware decoders require all frames that they will use for
3411 * output to be defined in advance before decoding starts. For such
3412 * decoders, the hardware frame pool must therefore be of a fixed size.
3413 * The extra frames set here are on top of any number that the decoder
3414 * needs internally in order to operate normally (for example, frames
3415 * used as reference pictures).
3417 int extra_hw_frames;
3420 * The percentage of damaged samples to discard a frame.
3422 * - decoding: set by user
3423 * - encoding: unused
3425 int discard_damaged_percentage;
3428 * The number of samples per frame to maximally accept.
3430 * - decoding: set by user
3431 * - encoding: set by user
3433 int64_t max_samples;
3436 * Bit set of AV_CODEC_EXPORT_DATA_* flags, which affects the kind of
3437 * metadata exported in frame, packet, or coded stream side data by
3438 * decoders and encoders.
3440 * - decoding: set by user
3441 * - encoding: set by user
3443 int export_side_data;
3446 #if FF_API_CODEC_GET_SET
3448 * Accessors for some AVCodecContext fields. These used to be provided for ABI
3449 * compatibility, and do not need to be used anymore.
3451 attribute_deprecated
3452 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3453 attribute_deprecated
3454 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3456 attribute_deprecated
3457 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3458 attribute_deprecated
3459 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3461 attribute_deprecated
3462 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3465 attribute_deprecated
3466 int av_codec_get_lowres(const AVCodecContext *avctx);
3467 attribute_deprecated
3468 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3471 attribute_deprecated
3472 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3473 attribute_deprecated
3474 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3476 attribute_deprecated
3477 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3478 attribute_deprecated
3479 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3485 typedef struct AVProfile {
3487 const char *name; ///< short name for the profile
3492 * The codec supports this format via the hw_device_ctx interface.
3494 * When selecting this format, AVCodecContext.hw_device_ctx should
3495 * have been set to a device of the specified type before calling
3498 AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX = 0x01,
3500 * The codec supports this format via the hw_frames_ctx interface.
3502 * When selecting this format for a decoder,
3503 * AVCodecContext.hw_frames_ctx should be set to a suitable frames
3504 * context inside the get_format() callback. The frames context
3505 * must have been created on a device of the specified type.
3507 AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX = 0x02,
3509 * The codec supports this format by some internal method.
3511 * This format can be selected without any additional configuration -
3512 * no device or frames context is required.
3514 AV_CODEC_HW_CONFIG_METHOD_INTERNAL = 0x04,
3516 * The codec supports this format by some ad-hoc method.
3518 * Additional settings and/or function calls are required. See the
3519 * codec-specific documentation for details. (Methods requiring
3520 * this sort of configuration are deprecated and others should be
3521 * used in preference.)
3523 AV_CODEC_HW_CONFIG_METHOD_AD_HOC = 0x08,
3526 typedef struct AVCodecHWConfig {
3528 * A hardware pixel format which the codec can use.
3530 enum AVPixelFormat pix_fmt;
3532 * Bit set of AV_CODEC_HW_CONFIG_METHOD_* flags, describing the possible
3533 * setup methods which can be used with this configuration.
3537 * The device type associated with the configuration.
3539 * Must be set for AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX and
3540 * AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX, otherwise unused.
3542 enum AVHWDeviceType device_type;
3545 typedef struct AVCodecDefault AVCodecDefault;
3552 typedef struct AVCodec {
3554 * Name of the codec implementation.
3555 * The name is globally unique among encoders and among decoders (but an
3556 * encoder and a decoder can share the same name).
3557 * This is the primary way to find a codec from the user perspective.
3561 * Descriptive name for the codec, meant to be more human readable than name.
3562 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3564 const char *long_name;
3565 enum AVMediaType type;
3568 * Codec capabilities.
3569 * see AV_CODEC_CAP_*
3572 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3573 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3574 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3575 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3576 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3577 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3578 const AVClass *priv_class; ///< AVClass for the private context
3579 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3582 * Group name of the codec implementation.
3583 * This is a short symbolic name of the wrapper backing this codec. A
3584 * wrapper uses some kind of external implementation for the codec, such
3585 * as an external library, or a codec implementation provided by the OS or
3587 * If this field is NULL, this is a builtin, libavcodec native codec.
3588 * If non-NULL, this will be the suffix in AVCodec.name in most cases
3589 * (usually AVCodec.name will be of the form "<codec_name>_<wrapper_name>").
3591 const char *wrapper_name;
3593 /*****************************************************************
3594 * No fields below this line are part of the public API. They
3595 * may not be used outside of libavcodec and can be changed and
3597 * New public fields should be added right above.
3598 *****************************************************************
3601 struct AVCodec *next;
3603 * @name Frame-level threading support functions
3607 * If defined, called on thread contexts when they are created.
3608 * If the codec allocates writable tables in init(), re-allocate them here.
3609 * priv_data will be set to a copy of the original.
3611 int (*init_thread_copy)(AVCodecContext *);
3613 * Copy necessary context variables from a previous thread context to the current one.
3614 * If not defined, the next thread will start automatically; otherwise, the codec
3615 * must call ff_thread_finish_setup().
3617 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3619 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3623 * Private codec-specific defaults.
3625 const AVCodecDefault *defaults;
3628 * Initialize codec static data, called from avcodec_register().
3630 * This is not intended for time consuming operations as it is
3631 * run for every codec regardless of that codec being used.
3633 void (*init_static_data)(struct AVCodec *codec);
3635 int (*init)(AVCodecContext *);
3636 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3637 const struct AVSubtitle *sub);
3639 * Encode data to an AVPacket.
3641 * @param avctx codec context
3642 * @param avpkt output AVPacket (may contain a user-provided buffer)
3643 * @param[in] frame AVFrame containing the raw data to be encoded
3644 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3645 * non-empty packet was returned in avpkt.
3646 * @return 0 on success, negative error code on failure
3648 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3649 int *got_packet_ptr);
3650 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3651 int (*close)(AVCodecContext *);
3653 * Encode API with decoupled packet/frame dataflow. The API is the
3654 * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3656 * - never called if the codec is closed or the wrong type,
3657 * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3658 * - only one drain frame is ever passed down,
3660 int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
3661 int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
3664 * Decode API with decoupled packet/frame dataflow. This function is called
3665 * to get one output frame. It should call ff_decode_get_packet() to obtain
3668 int (*receive_frame)(AVCodecContext *avctx, AVFrame *frame);
3671 * Will be called when seeking
3673 void (*flush)(AVCodecContext *);
3675 * Internal codec capabilities.
3676 * See FF_CODEC_CAP_* in internal.h
3681 * Decoding only, a comma-separated list of bitstream filters to apply to
3682 * packets before decoding.
3687 * Array of pointers to hardware configurations supported by the codec,
3688 * or NULL if no hardware supported. The array is terminated by a NULL
3691 * The user can only access this field via avcodec_get_hw_config().
3693 const struct AVCodecHWConfigInternal **hw_configs;
3696 * List of supported codec_tags, terminated by FF_CODEC_TAGS_END.
3698 const uint32_t *codec_tags;
3701 #if FF_API_CODEC_GET_SET
3702 attribute_deprecated
3703 int av_codec_get_max_lowres(const AVCodec *codec);
3706 struct MpegEncContext;
3709 * Retrieve supported hardware configurations for a codec.
3711 * Values of index from zero to some maximum return the indexed configuration
3712 * descriptor; all other values return NULL. If the codec does not support
3713 * any hardware configurations then it will always return NULL.
3715 const AVCodecHWConfig *avcodec_get_hw_config(const AVCodec *codec, int index);
3718 * @defgroup lavc_hwaccel AVHWAccel
3720 * @note Nothing in this structure should be accessed by the user. At some
3721 * point in future it will not be externally visible at all.
3725 typedef struct AVHWAccel {
3727 * Name of the hardware accelerated codec.
3728 * The name is globally unique among encoders and among decoders (but an
3729 * encoder and a decoder can share the same name).
3734 * Type of codec implemented by the hardware accelerator.
3736 * See AVMEDIA_TYPE_xxx
3738 enum AVMediaType type;
3741 * Codec implemented by the hardware accelerator.
3743 * See AV_CODEC_ID_xxx
3748 * Supported pixel format.
3750 * Only hardware accelerated formats are supported here.
3752 enum AVPixelFormat pix_fmt;
3755 * Hardware accelerated codec capabilities.
3756 * see AV_HWACCEL_CODEC_CAP_*
3760 /*****************************************************************
3761 * No fields below this line are part of the public API. They
3762 * may not be used outside of libavcodec and can be changed and
3764 * New public fields should be added right above.
3765 *****************************************************************
3769 * Allocate a custom buffer
3771 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3774 * Called at the beginning of each frame or field picture.
3776 * Meaningful frame information (codec specific) is guaranteed to
3777 * be parsed at this point. This function is mandatory.
3779 * Note that buf can be NULL along with buf_size set to 0.
3780 * Otherwise, this means the whole frame is available at this point.
3782 * @param avctx the codec context
3783 * @param buf the frame data buffer base
3784 * @param buf_size the size of the frame in bytes
3785 * @return zero if successful, a negative value otherwise
3787 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3790 * Callback for parameter data (SPS/PPS/VPS etc).
3792 * Useful for hardware decoders which keep persistent state about the
3793 * video parameters, and need to receive any changes to update that state.
3795 * @param avctx the codec context
3796 * @param type the nal unit type
3797 * @param buf the nal unit data buffer
3798 * @param buf_size the size of the nal unit in bytes
3799 * @return zero if successful, a negative value otherwise
3801 int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);
3804 * Callback for each slice.
3806 * Meaningful slice information (codec specific) is guaranteed to
3807 * be parsed at this point. This function is mandatory.
3808 * The only exception is XvMC, that works on MB level.
3810 * @param avctx the codec context
3811 * @param buf the slice data buffer base
3812 * @param buf_size the size of the slice in bytes
3813 * @return zero if successful, a negative value otherwise
3815 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3818 * Called at the end of each frame or field picture.
3820 * The whole picture is parsed at this point and can now be sent
3821 * to the hardware accelerator. This function is mandatory.
3823 * @param avctx the codec context
3824 * @return zero if successful, a negative value otherwise
3826 int (*end_frame)(AVCodecContext *avctx);
3829 * Size of per-frame hardware accelerator private data.
3831 * Private data is allocated with av_mallocz() before
3832 * AVCodecContext.get_buffer() and deallocated after
3833 * AVCodecContext.release_buffer().
3835 int frame_priv_data_size;
3838 * Called for every Macroblock in a slice.
3840 * XvMC uses it to replace the ff_mpv_reconstruct_mb().
3841 * Instead of decoding to raw picture, MB parameters are
3842 * stored in an array provided by the video driver.
3844 * @param s the mpeg context
3846 void (*decode_mb)(struct MpegEncContext *s);
3849 * Initialize the hwaccel private data.
3851 * This will be called from ff_get_format(), after hwaccel and
3852 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3855 int (*init)(AVCodecContext *avctx);
3858 * Uninitialize the hwaccel private data.
3860 * This will be called from get_format() or avcodec_close(), after hwaccel
3861 * and hwaccel_context are already uninitialized.
3863 int (*uninit)(AVCodecContext *avctx);
3866 * Size of the private data to allocate in
3867 * AVCodecInternal.hwaccel_priv_data.
3872 * Internal hwaccel capabilities.
3877 * Fill the given hw_frames context with current codec parameters. Called
3878 * from get_format. Refer to avcodec_get_hw_frames_parameters() for
3881 * This CAN be called before AVHWAccel.init is called, and you must assume
3882 * that avctx->hwaccel_priv_data is invalid.
3884 int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
3888 * HWAccel is experimental and is thus avoided in favor of non experimental
3891 #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
3894 * Hardware acceleration should be used for decoding even if the codec level
3895 * used is unknown or higher than the maximum supported level reported by the
3898 * It's generally a good idea to pass this flag unless you have a specific
3899 * reason not to, as hardware tends to under-report supported levels.
3901 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3904 * Hardware acceleration can output YUV pixel formats with a different chroma
3905 * sampling than 4:2:0 and/or other than 8 bits per component.
3907 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3910 * Hardware acceleration should still be attempted for decoding when the
3911 * codec profile does not match the reported capabilities of the hardware.
3913 * For example, this can be used to try to decode baseline profile H.264
3914 * streams in hardware - it will often succeed, because many streams marked
3915 * as baseline profile actually conform to constrained baseline profile.
3917 * @warning If the stream is actually not supported then the behaviour is
3918 * undefined, and may include returning entirely incorrect output
3919 * while indicating success.
3921 #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
3927 #if FF_API_AVPICTURE
3929 * @defgroup lavc_picture AVPicture
3931 * Functions for working with AVPicture
3936 * Picture data structure.
3938 * Up to four components can be stored into it, the last component is
3940 * @deprecated use AVFrame or imgutils functions instead
3942 typedef struct AVPicture {
3943 attribute_deprecated
3944 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3945 attribute_deprecated
3946 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3954 enum AVSubtitleType {
3957 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3960 * Plain text, the text field must be set by the decoder and is
3961 * authoritative. ass and pict fields may contain approximations.
3966 * Formatted text, the ass field must be set by the decoder and is
3967 * authoritative. pict and text fields may contain approximations.
3972 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3974 typedef struct AVSubtitleRect {
3975 int x; ///< top left corner of pict, undefined when pict is not set
3976 int y; ///< top left corner of pict, undefined when pict is not set
3977 int w; ///< width of pict, undefined when pict is not set
3978 int h; ///< height of pict, undefined when pict is not set
3979 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3981 #if FF_API_AVPICTURE
3983 * @deprecated unused
3985 attribute_deprecated
3989 * data+linesize for the bitmap of this subtitle.
3990 * Can be set for text/ass as well once they are rendered.
3995 enum AVSubtitleType type;
3997 char *text; ///< 0 terminated plain UTF-8 text
4000 * 0 terminated ASS/SSA compatible event line.
4001 * The presentation of this is unaffected by the other values in this
4009 typedef struct AVSubtitle {
4010 uint16_t format; /* 0 = graphics */
4011 uint32_t start_display_time; /* relative to packet pts, in ms */
4012 uint32_t end_display_time; /* relative to packet pts, in ms */
4014 AVSubtitleRect **rects;
4015 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
4019 * This struct describes the properties of an encoded stream.
4021 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
4022 * be allocated with avcodec_parameters_alloc() and freed with
4023 * avcodec_parameters_free().
4025 typedef struct AVCodecParameters {
4027 * General type of the encoded data.
4029 enum AVMediaType codec_type;
4031 * Specific type of the encoded data (the codec used).
4033 enum AVCodecID codec_id;
4035 * Additional information about the codec (corresponds to the AVI FOURCC).
4040 * Extra binary data needed for initializing the decoder, codec-dependent.
4042 * Must be allocated with av_malloc() and will be freed by
4043 * avcodec_parameters_free(). The allocated size of extradata must be at
4044 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
4049 * Size of the extradata content in bytes.
4054 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
4055 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
4060 * The average bitrate of the encoded data (in bits per second).
4065 * The number of bits per sample in the codedwords.
4067 * This is basically the bitrate per sample. It is mandatory for a bunch of
4068 * formats to actually decode them. It's the number of bits for one sample in
4069 * the actual coded bitstream.
4071 * This could be for example 4 for ADPCM
4072 * For PCM formats this matches bits_per_raw_sample
4075 int bits_per_coded_sample;
4078 * This is the number of valid bits in each output sample. If the
4079 * sample format has more bits, the least significant bits are additional
4080 * padding bits, which are always 0. Use right shifts to reduce the sample
4081 * to its actual size. For example, audio formats with 24 bit samples will
4082 * have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32.
4083 * To get the original sample use "(int32_t)sample >> 8"."
4085 * For ADPCM this might be 12 or 16 or similar
4088 int bits_per_raw_sample;
4091 * Codec-specific bitstream restrictions that the stream conforms to.
4097 * Video only. The dimensions of the video frame in pixels.
4103 * Video only. The aspect ratio (width / height) which a single pixel
4104 * should have when displayed.
4106 * When the aspect ratio is unknown / undefined, the numerator should be
4107 * set to 0 (the denominator may have any value).
4109 AVRational sample_aspect_ratio;
4112 * Video only. The order of the fields in interlaced video.
4114 enum AVFieldOrder field_order;
4117 * Video only. Additional colorspace characteristics.
4119 enum AVColorRange color_range;
4120 enum AVColorPrimaries color_primaries;
4121 enum AVColorTransferCharacteristic color_trc;
4122 enum AVColorSpace color_space;
4123 enum AVChromaLocation chroma_location;
4126 * Video only. Number of delayed frames.
4131 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
4132 * unknown or unspecified, otherwise the number of bits set must be equal to
4133 * the channels field.
4135 uint64_t channel_layout;
4137 * Audio only. The number of audio channels.
4141 * Audio only. The number of audio samples per second.
4145 * Audio only. The number of bytes per coded audio frame, required by some
4148 * Corresponds to nBlockAlign in WAVEFORMATEX.
4152 * Audio only. Audio frame size, if known. Required by some formats to be static.
4157 * Audio only. The amount of padding (in samples) inserted by the encoder at
4158 * the beginning of the audio. I.e. this number of leading decoded samples
4159 * must be discarded by the caller to get the original audio without leading
4162 int initial_padding;
4164 * Audio only. The amount of padding (in samples) appended by the encoder to
4165 * the end of the audio. I.e. this number of decoded samples must be
4166 * discarded by the caller from the end of the stream to get the original
4167 * audio without any trailing padding.
4169 int trailing_padding;
4171 * Audio only. Number of samples to skip after a discontinuity.
4174 } AVCodecParameters;
4177 * Iterate over all registered codecs.
4179 * @param opaque a pointer where libavcodec will store the iteration state. Must
4180 * point to NULL to start the iteration.
4182 * @return the next registered codec or NULL when the iteration is
4185 const AVCodec *av_codec_iterate(void **opaque);
4189 * If c is NULL, returns the first registered codec,
4190 * if c is non-NULL, returns the next registered codec after c,
4191 * or NULL if c is the last one.
4193 attribute_deprecated
4194 AVCodec *av_codec_next(const AVCodec *c);
4198 * Return the LIBAVCODEC_VERSION_INT constant.
4200 unsigned avcodec_version(void);
4203 * Return the libavcodec build-time configuration.
4205 const char *avcodec_configuration(void);
4208 * Return the libavcodec license.
4210 const char *avcodec_license(void);
4214 * Register the codec codec and initialize libavcodec.
4216 * @warning either this function or avcodec_register_all() must be called
4217 * before any other libavcodec functions.
4219 * @see avcodec_register_all()
4221 attribute_deprecated
4222 void avcodec_register(AVCodec *codec);
4225 * Register all the codecs, parsers and bitstream filters which were enabled at
4226 * configuration time. If you do not call this function you can select exactly
4227 * which formats you want to support, by using the individual registration
4230 * @see avcodec_register
4231 * @see av_register_codec_parser
4232 * @see av_register_bitstream_filter
4234 attribute_deprecated
4235 void avcodec_register_all(void);
4239 * Allocate an AVCodecContext and set its fields to default values. The
4240 * resulting struct should be freed with avcodec_free_context().
4242 * @param codec if non-NULL, allocate private data and initialize defaults
4243 * for the given codec. It is illegal to then call avcodec_open2()
4244 * with a different codec.
4245 * If NULL, then the codec-specific defaults won't be initialized,
4246 * which may result in suboptimal default settings (this is
4247 * important mainly for encoders, e.g. libx264).
4249 * @return An AVCodecContext filled with default values or NULL on failure.
4251 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
4254 * Free the codec context and everything associated with it and write NULL to
4255 * the provided pointer.
4257 void avcodec_free_context(AVCodecContext **avctx);
4259 #if FF_API_GET_CONTEXT_DEFAULTS
4261 * @deprecated This function should not be used, as closing and opening a codec
4262 * context multiple time is not supported. A new codec context should be
4263 * allocated for each new use.
4265 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
4269 * Get the AVClass for AVCodecContext. It can be used in combination with
4270 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4272 * @see av_opt_find().
4274 const AVClass *avcodec_get_class(void);
4276 #if FF_API_COPY_CONTEXT
4278 * Get the AVClass for AVFrame. It can be used in combination with
4279 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4281 * @see av_opt_find().
4283 const AVClass *avcodec_get_frame_class(void);
4286 * Get the AVClass for AVSubtitleRect. It can be used in combination with
4287 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4289 * @see av_opt_find().
4291 const AVClass *avcodec_get_subtitle_rect_class(void);
4294 * Copy the settings of the source AVCodecContext into the destination
4295 * AVCodecContext. The resulting destination codec context will be
4296 * unopened, i.e. you are required to call avcodec_open2() before you
4297 * can use this AVCodecContext to decode/encode video/audio data.
4299 * @param dest target codec context, should be initialized with
4300 * avcodec_alloc_context3(NULL), but otherwise uninitialized
4301 * @param src source codec context
4302 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4304 * @deprecated The semantics of this function are ill-defined and it should not
4305 * be used. If you need to transfer the stream parameters from one codec context
4306 * to another, use an intermediate AVCodecParameters instance and the
4307 * avcodec_parameters_from_context() / avcodec_parameters_to_context()
4310 attribute_deprecated
4311 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
4315 * Allocate a new AVCodecParameters and set its fields to default values
4316 * (unknown/invalid/0). The returned struct must be freed with
4317 * avcodec_parameters_free().
4319 AVCodecParameters *avcodec_parameters_alloc(void);
4322 * Free an AVCodecParameters instance and everything associated with it and
4323 * write NULL to the supplied pointer.
4325 void avcodec_parameters_free(AVCodecParameters **par);
4328 * Copy the contents of src to dst. Any allocated fields in dst are freed and
4329 * replaced with newly allocated duplicates of the corresponding fields in src.
4331 * @return >= 0 on success, a negative AVERROR code on failure.
4333 int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
4336 * Fill the parameters struct based on the values from the supplied codec
4337 * context. Any allocated fields in par are freed and replaced with duplicates
4338 * of the corresponding fields in codec.
4340 * @return >= 0 on success, a negative AVERROR code on failure
4342 int avcodec_parameters_from_context(AVCodecParameters *par,
4343 const AVCodecContext *codec);
4346 * Fill the codec context based on the values from the supplied codec
4347 * parameters. Any allocated fields in codec that have a corresponding field in
4348 * par are freed and replaced with duplicates of the corresponding field in par.
4349 * Fields in codec that do not have a counterpart in par are not touched.
4351 * @return >= 0 on success, a negative AVERROR code on failure.
4353 int avcodec_parameters_to_context(AVCodecContext *codec,
4354 const AVCodecParameters *par);
4357 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4358 * function the context has to be allocated with avcodec_alloc_context3().
4360 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4361 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4362 * retrieving a codec.
4364 * @warning This function is not thread safe!
4366 * @note Always call this function before using decoding routines (such as
4367 * @ref avcodec_receive_frame()).
4370 * avcodec_register_all();
4371 * av_dict_set(&opts, "b", "2.5M", 0);
4372 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
4376 * context = avcodec_alloc_context3(codec);
4378 * if (avcodec_open2(context, codec, opts) < 0)
4382 * @param avctx The context to initialize.
4383 * @param codec The codec to open this context for. If a non-NULL codec has been
4384 * previously passed to avcodec_alloc_context3() or
4385 * for this context, then this parameter MUST be either NULL or
4386 * equal to the previously passed codec.
4387 * @param options A dictionary filled with AVCodecContext and codec-private options.
4388 * On return this object will be filled with options that were not found.
4390 * @return zero on success, a negative value on error
4391 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4392 * av_dict_set(), av_opt_find().
4394 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4397 * Close a given AVCodecContext and free all the data associated with it
4398 * (but not the AVCodecContext itself).
4400 * Calling this function on an AVCodecContext that hasn't been opened will free
4401 * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
4402 * codec. Subsequent calls will do nothing.
4404 * @note Do not use this function. Use avcodec_free_context() to destroy a
4405 * codec context (either open or closed). Opening and closing a codec context
4406 * multiple times is not supported anymore -- use multiple codec contexts
4409 int avcodec_close(AVCodecContext *avctx);
4412 * Free all allocated data in the given subtitle struct.
4414 * @param sub AVSubtitle to free.
4416 void avsubtitle_free(AVSubtitle *sub);
4423 * @addtogroup lavc_packet
4428 * Allocate an AVPacket and set its fields to default values. The resulting
4429 * struct must be freed using av_packet_free().
4431 * @return An AVPacket filled with default values or NULL on failure.
4433 * @note this only allocates the AVPacket itself, not the data buffers. Those
4434 * must be allocated through other means such as av_new_packet.
4436 * @see av_new_packet
4438 AVPacket *av_packet_alloc(void);
4441 * Create a new packet that references the same data as src.
4443 * This is a shortcut for av_packet_alloc()+av_packet_ref().
4445 * @return newly created AVPacket on success, NULL on error.
4447 * @see av_packet_alloc
4448 * @see av_packet_ref
4450 AVPacket *av_packet_clone(const AVPacket *src);
4453 * Free the packet, if the packet is reference counted, it will be
4454 * unreferenced first.
4456 * @param pkt packet to be freed. The pointer will be set to NULL.
4457 * @note passing NULL is a no-op.
4459 void av_packet_free(AVPacket **pkt);
4462 * Initialize optional fields of a packet with default values.
4464 * Note, this does not touch the data and size members, which have to be
4465 * initialized separately.
4469 void av_init_packet(AVPacket *pkt);
4472 * Allocate the payload of a packet and initialize its fields with
4476 * @param size wanted payload size
4477 * @return 0 if OK, AVERROR_xxx otherwise
4479 int av_new_packet(AVPacket *pkt, int size);
4482 * Reduce packet size, correctly zeroing padding
4485 * @param size new size
4487 void av_shrink_packet(AVPacket *pkt, int size);
4490 * Increase packet size, correctly zeroing padding
4493 * @param grow_by number of bytes by which to increase the size of the packet
4495 int av_grow_packet(AVPacket *pkt, int grow_by);
4498 * Initialize a reference-counted packet from av_malloc()ed data.
4500 * @param pkt packet to be initialized. This function will set the data, size,
4501 * and buf fields, all others are left untouched.
4502 * @param data Data allocated by av_malloc() to be used as packet data. If this
4503 * function returns successfully, the data is owned by the underlying AVBuffer.
4504 * The caller may not access the data through other means.
4505 * @param size size of data in bytes, without the padding. I.e. the full buffer
4506 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4508 * @return 0 on success, a negative AVERROR on error
4510 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4512 #if FF_API_AVPACKET_OLD_API
4514 * @warning This is a hack - the packet memory allocation stuff is broken. The
4515 * packet is allocated if it was not really allocated.
4517 * @deprecated Use av_packet_ref or av_packet_make_refcounted
4519 attribute_deprecated
4520 int av_dup_packet(AVPacket *pkt);
4522 * Copy packet, including contents
4524 * @return 0 on success, negative AVERROR on fail
4526 * @deprecated Use av_packet_ref
4528 attribute_deprecated
4529 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4532 * Copy packet side data
4534 * @return 0 on success, negative AVERROR on fail
4536 * @deprecated Use av_packet_copy_props
4538 attribute_deprecated
4539 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4544 * @deprecated Use av_packet_unref
4546 * @param pkt packet to free
4548 attribute_deprecated
4549 void av_free_packet(AVPacket *pkt);
4552 * Allocate new information of a packet.
4555 * @param type side information type
4556 * @param size side information size
4557 * @return pointer to fresh allocated data or NULL otherwise
4559 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4563 * Wrap an existing array as a packet side data.
4566 * @param type side information type
4567 * @param data the side data array. It must be allocated with the av_malloc()
4568 * family of functions. The ownership of the data is transferred to
4570 * @param size side information size
4571 * @return a non-negative number on success, a negative AVERROR code on
4572 * failure. On failure, the packet is unchanged and the data remains
4573 * owned by the caller.
4575 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4576 uint8_t *data, size_t size);
4579 * Shrink the already allocated side data buffer
4582 * @param type side information type
4583 * @param size new side information size
4584 * @return 0 on success, < 0 on failure
4586 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4590 * Get side information from packet.
4593 * @param type desired side information type
4594 * @param size pointer for side information size to store (optional)
4595 * @return pointer to data if present or NULL otherwise
4597 uint8_t* av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type,
4600 #if FF_API_MERGE_SD_API
4601 attribute_deprecated
4602 int av_packet_merge_side_data(AVPacket *pkt);
4604 attribute_deprecated
4605 int av_packet_split_side_data(AVPacket *pkt);
4608 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4611 * Pack a dictionary for use in side_data.
4613 * @param dict The dictionary to pack.
4614 * @param size pointer to store the size of the returned data
4615 * @return pointer to data if successful, NULL otherwise
4617 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4619 * Unpack a dictionary from side_data.
4621 * @param data data from side_data
4622 * @param size size of the data
4623 * @param dict the metadata storage dictionary
4624 * @return 0 on success, < 0 on failure
4626 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4630 * Convenience function to free all the side data stored.
4631 * All the other fields stay untouched.
4635 void av_packet_free_side_data(AVPacket *pkt);
4638 * Setup a new reference to the data described by a given packet
4640 * If src is reference-counted, setup dst as a new reference to the
4641 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4642 * data from src into it.
4644 * All the other fields are copied from src.
4646 * @see av_packet_unref
4648 * @param dst Destination packet
4649 * @param src Source packet
4651 * @return 0 on success, a negative AVERROR on error.
4653 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4658 * Unreference the buffer referenced by the packet and reset the
4659 * remaining packet fields to their default values.
4661 * @param pkt The packet to be unreferenced.
4663 void av_packet_unref(AVPacket *pkt);
4666 * Move every field in src to dst and reset src.
4668 * @see av_packet_unref
4670 * @param src Source packet, will be reset
4671 * @param dst Destination packet
4673 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4676 * Copy only "properties" fields from src to dst.
4678 * Properties for the purpose of this function are all the fields
4679 * beside those related to the packet data (buf, data, size)
4681 * @param dst Destination packet
4682 * @param src Source packet
4684 * @return 0 on success AVERROR on failure.
4686 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4689 * Ensure the data described by a given packet is reference counted.
4691 * @note This function does not ensure that the reference will be writable.
4692 * Use av_packet_make_writable instead for that purpose.
4694 * @see av_packet_ref
4695 * @see av_packet_make_writable
4697 * @param pkt packet whose data should be made reference counted.
4699 * @return 0 on success, a negative AVERROR on error. On failure, the
4700 * packet is unchanged.
4702 int av_packet_make_refcounted(AVPacket *pkt);
4705 * Create a writable reference for the data described by a given packet,
4706 * avoiding data copy if possible.
4708 * @param pkt Packet whose data should be made writable.
4710 * @return 0 on success, a negative AVERROR on failure. On failure, the
4711 * packet is unchanged.
4713 int av_packet_make_writable(AVPacket *pkt);
4716 * Convert valid timing fields (timestamps / durations) in a packet from one
4717 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4720 * @param pkt packet on which the conversion will be performed
4721 * @param tb_src source timebase, in which the timing fields in pkt are
4723 * @param tb_dst destination timebase, to which the timing fields will be
4726 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4733 * @addtogroup lavc_decoding
4738 * Find a registered decoder with a matching codec ID.
4740 * @param id AVCodecID of the requested decoder
4741 * @return A decoder if one was found, NULL otherwise.
4743 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4746 * Find a registered decoder with the specified name.
4748 * @param name name of the requested decoder
4749 * @return A decoder if one was found, NULL otherwise.
4751 AVCodec *avcodec_find_decoder_by_name(const char *name);
4754 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4755 * it can be called by custom get_buffer2() implementations for decoders without
4756 * AV_CODEC_CAP_DR1 set.
4758 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4761 * Modify width and height values so that they will result in a memory
4762 * buffer that is acceptable for the codec if you do not use any horizontal
4765 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4767 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4770 * Modify width and height values so that they will result in a memory
4771 * buffer that is acceptable for the codec if you also ensure that all
4772 * line sizes are a multiple of the respective linesize_align[i].
4774 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4776 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4777 int linesize_align[AV_NUM_DATA_POINTERS]);
4780 * Converts AVChromaLocation to swscale x/y chroma position.
4782 * The positions represent the chroma (0,0) position in a coordinates system
4783 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4785 * @param xpos horizontal chroma sample position
4786 * @param ypos vertical chroma sample position
4788 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4791 * Converts swscale x/y chroma position to AVChromaLocation.
4793 * The positions represent the chroma (0,0) position in a coordinates system
4794 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4796 * @param xpos horizontal chroma sample position
4797 * @param ypos vertical chroma sample position
4799 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4802 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4804 * Some decoders may support multiple frames in a single AVPacket. Such
4805 * decoders would then just decode the first frame and the return value would be
4806 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4807 * called again with an AVPacket containing the remaining data in order to
4808 * decode the second frame, etc... Even if no frames are returned, the packet
4809 * needs to be fed to the decoder with remaining data until it is completely
4810 * consumed or an error occurs.
4812 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4813 * and output. This means that for some packets they will not immediately
4814 * produce decoded output and need to be flushed at the end of decoding to get
4815 * all the decoded data. Flushing is done by calling this function with packets
4816 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4817 * returning samples. It is safe to flush even those decoders that are not
4818 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4820 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4821 * larger than the actual read bytes because some optimized bitstream
4822 * readers read 32 or 64 bits at once and could read over the end.
4824 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4825 * before packets may be fed to the decoder.
4827 * @param avctx the codec context
4828 * @param[out] frame The AVFrame in which to store decoded audio samples.
4829 * The decoder will allocate a buffer for the decoded frame by
4830 * calling the AVCodecContext.get_buffer2() callback.
4831 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4832 * reference counted and the returned reference belongs to the
4833 * caller. The caller must release the frame using av_frame_unref()
4834 * when the frame is no longer needed. The caller may safely write
4835 * to the frame if av_frame_is_writable() returns 1.
4836 * When AVCodecContext.refcounted_frames is set to 0, the returned
4837 * reference belongs to the decoder and is valid only until the
4838 * next call to this function or until closing or flushing the
4839 * decoder. The caller may not write to it.
4840 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4841 * non-zero. Note that this field being set to zero
4842 * does not mean that an error has occurred. For
4843 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4844 * call is guaranteed to produce a frame.
4845 * @param[in] avpkt The input AVPacket containing the input buffer.
4846 * At least avpkt->data and avpkt->size should be set. Some
4847 * decoders might also require additional fields to be set.
4848 * @return A negative error code is returned if an error occurred during
4849 * decoding, otherwise the number of bytes consumed from the input
4850 * AVPacket is returned.
4852 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4854 attribute_deprecated
4855 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4856 int *got_frame_ptr, const AVPacket *avpkt);
4859 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4860 * Some decoders may support multiple frames in a single AVPacket, such
4861 * decoders would then just decode the first frame.
4863 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4864 * the actual read bytes because some optimized bitstream readers read 32 or 64
4865 * bits at once and could read over the end.
4867 * @warning The end of the input buffer buf should be set to 0 to ensure that
4868 * no overreading happens for damaged MPEG streams.
4870 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4871 * between input and output, these need to be fed with avpkt->data=NULL,
4872 * avpkt->size=0 at the end to return the remaining frames.
4874 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4875 * before packets may be fed to the decoder.
4877 * @param avctx the codec context
4878 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4879 * Use av_frame_alloc() to get an AVFrame. The codec will
4880 * allocate memory for the actual bitmap by calling the
4881 * AVCodecContext.get_buffer2() callback.
4882 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4883 * reference counted and the returned reference belongs to the
4884 * caller. The caller must release the frame using av_frame_unref()
4885 * when the frame is no longer needed. The caller may safely write
4886 * to the frame if av_frame_is_writable() returns 1.
4887 * When AVCodecContext.refcounted_frames is set to 0, the returned
4888 * reference belongs to the decoder and is valid only until the
4889 * next call to this function or until closing or flushing the
4890 * decoder. The caller may not write to it.
4892 * @param[in] avpkt The input AVPacket containing the input buffer.
4893 * You can create such packet with av_init_packet() and by then setting
4894 * data and size, some decoders might in addition need other fields like
4895 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4897 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4898 * @return On error a negative value is returned, otherwise the number of bytes
4899 * used or zero if no frame could be decompressed.
4901 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4903 attribute_deprecated
4904 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4905 int *got_picture_ptr,
4906 const AVPacket *avpkt);
4909 * Decode a subtitle message.
4910 * Return a negative value on error, otherwise return the number of bytes used.
4911 * If no subtitle could be decompressed, got_sub_ptr is zero.
4912 * Otherwise, the subtitle is stored in *sub.
4913 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4914 * simplicity, because the performance difference is expected to be negligible
4915 * and reusing a get_buffer written for video codecs would probably perform badly
4916 * due to a potentially very different allocation pattern.
4918 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4919 * and output. This means that for some packets they will not immediately
4920 * produce decoded output and need to be flushed at the end of decoding to get
4921 * all the decoded data. Flushing is done by calling this function with packets
4922 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4923 * returning subtitles. It is safe to flush even those decoders that are not
4924 * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
4926 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4927 * before packets may be fed to the decoder.
4929 * @param avctx the codec context
4930 * @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored,
4931 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4932 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4933 * @param[in] avpkt The input AVPacket containing the input buffer.
4935 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4940 * Supply raw packet data as input to a decoder.
4942 * Internally, this call will copy relevant AVCodecContext fields, which can
4943 * influence decoding per-packet, and apply them when the packet is actually
4944 * decoded. (For example AVCodecContext.skip_frame, which might direct the
4945 * decoder to drop the frame contained by the packet sent with this function.)
4947 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4948 * larger than the actual read bytes because some optimized bitstream
4949 * readers read 32 or 64 bits at once and could read over the end.
4951 * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
4952 * on the same AVCodecContext. It will return unexpected results now
4953 * or in future libavcodec versions.
4955 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4956 * before packets may be fed to the decoder.
4958 * @param avctx codec context
4959 * @param[in] avpkt The input AVPacket. Usually, this will be a single video
4960 * frame, or several complete audio frames.
4961 * Ownership of the packet remains with the caller, and the
4962 * decoder will not write to the packet. The decoder may create
4963 * a reference to the packet data (or copy it if the packet is
4964 * not reference-counted).
4965 * Unlike with older APIs, the packet is always fully consumed,
4966 * and if it contains multiple frames (e.g. some audio codecs),
4967 * will require you to call avcodec_receive_frame() multiple
4968 * times afterwards before you can send a new packet.
4969 * It can be NULL (or an AVPacket with data set to NULL and
4970 * size set to 0); in this case, it is considered a flush
4971 * packet, which signals the end of the stream. Sending the
4972 * first flush packet will return success. Subsequent ones are
4973 * unnecessary and will return AVERROR_EOF. If the decoder
4974 * still has frames buffered, it will return them after sending
4977 * @return 0 on success, otherwise negative error code:
4978 * AVERROR(EAGAIN): input is not accepted in the current state - user
4979 * must read output with avcodec_receive_frame() (once
4980 * all output is read, the packet should be resent, and
4981 * the call will not fail with EAGAIN).
4982 * AVERROR_EOF: the decoder has been flushed, and no new packets can
4983 * be sent to it (also returned if more than 1 flush
4985 * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
4986 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4987 * other errors: legitimate decoding errors
4989 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
4992 * Return decoded output data from a decoder.
4994 * @param avctx codec context
4995 * @param frame This will be set to a reference-counted video or audio
4996 * frame (depending on the decoder type) allocated by the
4997 * decoder. Note that the function will always call
4998 * av_frame_unref(frame) before doing anything else.
5001 * 0: success, a frame was returned
5002 * AVERROR(EAGAIN): output is not available in this state - user must try
5004 * AVERROR_EOF: the decoder has been fully flushed, and there will be
5005 * no more output frames
5006 * AVERROR(EINVAL): codec not opened, or it is an encoder
5007 * AVERROR_INPUT_CHANGED: current decoded frame has changed parameters
5008 * with respect to first decoded frame. Applicable
5009 * when flag AV_CODEC_FLAG_DROPCHANGED is set.
5010 * other negative values: legitimate decoding errors
5012 int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
5015 * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
5016 * to retrieve buffered output packets.
5018 * @param avctx codec context
5019 * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
5020 * Ownership of the frame remains with the caller, and the
5021 * encoder will not write to the frame. The encoder may create
5022 * a reference to the frame data (or copy it if the frame is
5023 * not reference-counted).
5024 * It can be NULL, in which case it is considered a flush
5025 * packet. This signals the end of the stream. If the encoder
5026 * still has packets buffered, it will return them after this
5027 * call. Once flushing mode has been entered, additional flush
5028 * packets are ignored, and sending frames will return
5032 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5033 * can have any number of samples.
5034 * If it is not set, frame->nb_samples must be equal to
5035 * avctx->frame_size for all frames except the last.
5036 * The final frame may be smaller than avctx->frame_size.
5037 * @return 0 on success, otherwise negative error code:
5038 * AVERROR(EAGAIN): input is not accepted in the current state - user
5039 * must read output with avcodec_receive_packet() (once
5040 * all output is read, the packet should be resent, and
5041 * the call will not fail with EAGAIN).
5042 * AVERROR_EOF: the encoder has been flushed, and no new frames can
5044 * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
5045 * decoder, or requires flush
5046 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5047 * other errors: legitimate decoding errors
5049 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
5052 * Read encoded data from the encoder.
5054 * @param avctx codec context
5055 * @param avpkt This will be set to a reference-counted packet allocated by the
5056 * encoder. Note that the function will always call
5057 * av_packet_unref(avpkt) before doing anything else.
5058 * @return 0 on success, otherwise negative error code:
5059 * AVERROR(EAGAIN): output is not available in the current state - user
5060 * must try to send input
5061 * AVERROR_EOF: the encoder has been fully flushed, and there will be
5062 * no more output packets
5063 * AVERROR(EINVAL): codec not opened, or it is an encoder
5064 * other errors: legitimate decoding errors
5066 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
5069 * Create and return a AVHWFramesContext with values adequate for hardware
5070 * decoding. This is meant to get called from the get_format callback, and is
5071 * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.
5072 * This API is for decoding with certain hardware acceleration modes/APIs only.
5074 * The returned AVHWFramesContext is not initialized. The caller must do this
5075 * with av_hwframe_ctx_init().
5077 * Calling this function is not a requirement, but makes it simpler to avoid
5078 * codec or hardware API specific details when manually allocating frames.
5080 * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,
5081 * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes
5082 * it unnecessary to call this function or having to care about
5083 * AVHWFramesContext initialization at all.
5085 * There are a number of requirements for calling this function:
5087 * - It must be called from get_format with the same avctx parameter that was
5088 * passed to get_format. Calling it outside of get_format is not allowed, and
5089 * can trigger undefined behavior.
5090 * - The function is not always supported (see description of return values).
5091 * Even if this function returns successfully, hwaccel initialization could
5092 * fail later. (The degree to which implementations check whether the stream
5093 * is actually supported varies. Some do this check only after the user's
5094 * get_format callback returns.)
5095 * - The hw_pix_fmt must be one of the choices suggested by get_format. If the
5096 * user decides to use a AVHWFramesContext prepared with this API function,
5097 * the user must return the same hw_pix_fmt from get_format.
5098 * - The device_ref passed to this function must support the given hw_pix_fmt.
5099 * - After calling this API function, it is the user's responsibility to
5100 * initialize the AVHWFramesContext (returned by the out_frames_ref parameter),
5101 * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done
5102 * before returning from get_format (this is implied by the normal
5103 * AVCodecContext.hw_frames_ctx API rules).
5104 * - The AVHWFramesContext parameters may change every time time get_format is
5105 * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So
5106 * you are inherently required to go through this process again on every
5108 * - It is perfectly possible to call this function without actually using
5109 * the resulting AVHWFramesContext. One use-case might be trying to reuse a
5110 * previously initialized AVHWFramesContext, and calling this API function
5111 * only to test whether the required frame parameters have changed.
5112 * - Fields that use dynamically allocated values of any kind must not be set
5113 * by the user unless setting them is explicitly allowed by the documentation.
5114 * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,
5115 * the new free callback must call the potentially set previous free callback.
5116 * This API call may set any dynamically allocated fields, including the free
5119 * The function will set at least the following fields on AVHWFramesContext
5120 * (potentially more, depending on hwaccel API):
5122 * - All fields set by av_hwframe_ctx_alloc().
5123 * - Set the format field to hw_pix_fmt.
5124 * - Set the sw_format field to the most suited and most versatile format. (An
5125 * implication is that this will prefer generic formats over opaque formats
5126 * with arbitrary restrictions, if possible.)
5127 * - Set the width/height fields to the coded frame size, rounded up to the
5128 * API-specific minimum alignment.
5129 * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size
5130 * field to the number of maximum reference surfaces possible with the codec,
5131 * plus 1 surface for the user to work (meaning the user can safely reference
5132 * at most 1 decoded surface at a time), plus additional buffering introduced
5133 * by frame threading. If the hwaccel does not require pre-allocation, the
5134 * field is left to 0, and the decoder will allocate new surfaces on demand
5136 * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying
5139 * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but
5140 * with basic frame parameters set.
5142 * The function is stateless, and does not change the AVCodecContext or the
5143 * device_ref AVHWDeviceContext.
5145 * @param avctx The context which is currently calling get_format, and which
5146 * implicitly contains all state needed for filling the returned
5147 * AVHWFramesContext properly.
5148 * @param device_ref A reference to the AVHWDeviceContext describing the device
5149 * which will be used by the hardware decoder.
5150 * @param hw_pix_fmt The hwaccel format you are going to return from get_format.
5151 * @param out_frames_ref On success, set to a reference to an _uninitialized_
5152 * AVHWFramesContext, created from the given device_ref.
5153 * Fields will be set to values required for decoding.
5154 * Not changed if an error is returned.
5155 * @return zero on success, a negative value on error. The following error codes
5156 * have special semantics:
5157 * AVERROR(ENOENT): the decoder does not support this functionality. Setup
5158 * is always manual, or it is a decoder which does not
5159 * support setting AVCodecContext.hw_frames_ctx at all,
5160 * or it is a software format.
5161 * AVERROR(EINVAL): it is known that hardware decoding is not supported for
5162 * this configuration, or the device_ref is not supported
5163 * for the hwaccel referenced by hw_pix_fmt.
5165 int avcodec_get_hw_frames_parameters(AVCodecContext *avctx,
5166 AVBufferRef *device_ref,
5167 enum AVPixelFormat hw_pix_fmt,
5168 AVBufferRef **out_frames_ref);
5173 * @defgroup lavc_parsing Frame parsing
5177 enum AVPictureStructure {
5178 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
5179 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
5180 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
5181 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
5184 typedef struct AVCodecParserContext {
5186 struct AVCodecParser *parser;
5187 int64_t frame_offset; /* offset of the current frame */
5188 int64_t cur_offset; /* current offset
5189 (incremented by each av_parser_parse()) */
5190 int64_t next_frame_offset; /* offset of the next frame */
5192 int pict_type; /* XXX: Put it back in AVCodecContext. */
5194 * This field is used for proper frame duration computation in lavf.
5195 * It signals, how much longer the frame duration of the current frame
5196 * is compared to normal frame duration.
5198 * frame_duration = (1 + repeat_pict) * time_base
5200 * It is used by codecs like H.264 to display telecined material.
5202 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
5203 int64_t pts; /* pts of the current frame */
5204 int64_t dts; /* dts of the current frame */
5209 int fetch_timestamp;
5211 #define AV_PARSER_PTS_NB 4
5212 int cur_frame_start_index;
5213 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
5214 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
5215 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
5218 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
5219 #define PARSER_FLAG_ONCE 0x0002
5220 /// Set if the parser has a valid file offset
5221 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
5222 #define PARSER_FLAG_USE_CODEC_TS 0x1000
5224 int64_t offset; ///< byte offset from starting packet start
5225 int64_t cur_frame_end[AV_PARSER_PTS_NB];
5228 * Set by parser to 1 for key frames and 0 for non-key frames.
5229 * It is initialized to -1, so if the parser doesn't set this flag,
5230 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
5235 #if FF_API_CONVERGENCE_DURATION
5237 * @deprecated unused
5239 attribute_deprecated
5240 int64_t convergence_duration;
5243 // Timestamp generation support:
5245 * Synchronization point for start of timestamp generation.
5247 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
5250 * For example, this corresponds to presence of H.264 buffering period
5256 * Offset of the current timestamp against last timestamp sync point in
5257 * units of AVCodecContext.time_base.
5259 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5260 * contain a valid timestamp offset.
5262 * Note that the timestamp of sync point has usually a nonzero
5263 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
5264 * the next frame after timestamp sync point will be usually 1.
5266 * For example, this corresponds to H.264 cpb_removal_delay.
5268 int dts_ref_dts_delta;
5271 * Presentation delay of current frame in units of AVCodecContext.time_base.
5273 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5274 * contain valid non-negative timestamp delta (presentation time of a frame
5275 * must not lie in the past).
5277 * This delay represents the difference between decoding and presentation
5278 * time of the frame.
5280 * For example, this corresponds to H.264 dpb_output_delay.
5285 * Position of the packet in file.
5287 * Analogous to cur_frame_pts/dts
5289 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
5292 * Byte position of currently parsed frame in stream.
5297 * Previous frame byte position.
5302 * Duration of the current frame.
5303 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
5304 * For all other types, this is in units of AVCodecContext.time_base.
5308 enum AVFieldOrder field_order;
5311 * Indicate whether a picture is coded as a frame, top field or bottom field.
5313 * For example, H.264 field_pic_flag equal to 0 corresponds to
5314 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
5315 * equal to 1 and bottom_field_flag equal to 0 corresponds to
5316 * AV_PICTURE_STRUCTURE_TOP_FIELD.
5318 enum AVPictureStructure picture_structure;
5321 * Picture number incremented in presentation or output order.
5322 * This field may be reinitialized at the first picture of a new sequence.
5324 * For example, this corresponds to H.264 PicOrderCnt.
5326 int output_picture_number;
5329 * Dimensions of the decoded video intended for presentation.
5335 * Dimensions of the coded video.
5341 * The format of the coded data, corresponds to enum AVPixelFormat for video
5342 * and for enum AVSampleFormat for audio.
5344 * Note that a decoder can have considerable freedom in how exactly it
5345 * decodes the data, so the format reported here might be different from the
5346 * one returned by a decoder.
5349 } AVCodecParserContext;
5351 typedef struct AVCodecParser {
5352 int codec_ids[5]; /* several codec IDs are permitted */
5354 int (*parser_init)(AVCodecParserContext *s);
5355 /* This callback never returns an error, a negative value means that
5356 * the frame start was in a previous packet. */
5357 int (*parser_parse)(AVCodecParserContext *s,
5358 AVCodecContext *avctx,
5359 const uint8_t **poutbuf, int *poutbuf_size,
5360 const uint8_t *buf, int buf_size);
5361 void (*parser_close)(AVCodecParserContext *s);
5362 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
5363 struct AVCodecParser *next;
5367 * Iterate over all registered codec parsers.
5369 * @param opaque a pointer where libavcodec will store the iteration state. Must
5370 * point to NULL to start the iteration.
5372 * @return the next registered codec parser or NULL when the iteration is
5375 const AVCodecParser *av_parser_iterate(void **opaque);
5377 attribute_deprecated
5378 AVCodecParser *av_parser_next(const AVCodecParser *c);
5380 attribute_deprecated
5381 void av_register_codec_parser(AVCodecParser *parser);
5382 AVCodecParserContext *av_parser_init(int codec_id);
5387 * @param s parser context.
5388 * @param avctx codec context.
5389 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
5390 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
5391 * @param buf input buffer.
5392 * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
5393 size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
5394 To signal EOF, this should be 0 (so that the last frame
5396 * @param pts input presentation timestamp.
5397 * @param dts input decoding timestamp.
5398 * @param pos input byte position in stream.
5399 * @return the number of bytes of the input bitstream used.
5404 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
5411 * decode_frame(data, size);
5415 int av_parser_parse2(AVCodecParserContext *s,
5416 AVCodecContext *avctx,
5417 uint8_t **poutbuf, int *poutbuf_size,
5418 const uint8_t *buf, int buf_size,
5419 int64_t pts, int64_t dts,
5423 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
5424 * @deprecated use AVBitStreamFilter
5426 int av_parser_change(AVCodecParserContext *s,
5427 AVCodecContext *avctx,
5428 uint8_t **poutbuf, int *poutbuf_size,
5429 const uint8_t *buf, int buf_size, int keyframe);
5430 void av_parser_close(AVCodecParserContext *s);
5438 * @addtogroup lavc_encoding
5443 * Find a registered encoder with a matching codec ID.
5445 * @param id AVCodecID of the requested encoder
5446 * @return An encoder if one was found, NULL otherwise.
5448 AVCodec *avcodec_find_encoder(enum AVCodecID id);
5451 * Find a registered encoder with the specified name.
5453 * @param name name of the requested encoder
5454 * @return An encoder if one was found, NULL otherwise.
5456 AVCodec *avcodec_find_encoder_by_name(const char *name);
5459 * Encode a frame of audio.
5461 * Takes input samples from frame and writes the next output packet, if
5462 * available, to avpkt. The output packet does not necessarily contain data for
5463 * the most recent frame, as encoders can delay, split, and combine input frames
5464 * internally as needed.
5466 * @param avctx codec context
5467 * @param avpkt output AVPacket.
5468 * The user can supply an output buffer by setting
5469 * avpkt->data and avpkt->size prior to calling the
5470 * function, but if the size of the user-provided data is not
5471 * large enough, encoding will fail. If avpkt->data and
5472 * avpkt->size are set, avpkt->destruct must also be set. All
5473 * other AVPacket fields will be reset by the encoder using
5474 * av_init_packet(). If avpkt->data is NULL, the encoder will
5475 * allocate it. The encoder will set avpkt->size to the size
5476 * of the output packet.
5478 * If this function fails or produces no output, avpkt will be
5479 * freed using av_packet_unref().
5480 * @param[in] frame AVFrame containing the raw audio data to be encoded.
5481 * May be NULL when flushing an encoder that has the
5482 * AV_CODEC_CAP_DELAY capability set.
5483 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5484 * can have any number of samples.
5485 * If it is not set, frame->nb_samples must be equal to
5486 * avctx->frame_size for all frames except the last.
5487 * The final frame may be smaller than avctx->frame_size.
5488 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5489 * output packet is non-empty, and to 0 if it is
5490 * empty. If the function returns an error, the
5491 * packet can be assumed to be invalid, and the
5492 * value of got_packet_ptr is undefined and should
5494 * @return 0 on success, negative error code on failure
5496 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5498 attribute_deprecated
5499 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
5500 const AVFrame *frame, int *got_packet_ptr);
5503 * Encode a frame of video.
5505 * Takes input raw video data from frame and writes the next output packet, if
5506 * available, to avpkt. The output packet does not necessarily contain data for
5507 * the most recent frame, as encoders can delay and reorder input frames
5508 * internally as needed.
5510 * @param avctx codec context
5511 * @param avpkt output AVPacket.
5512 * The user can supply an output buffer by setting
5513 * avpkt->data and avpkt->size prior to calling the
5514 * function, but if the size of the user-provided data is not
5515 * large enough, encoding will fail. All other AVPacket fields
5516 * will be reset by the encoder using av_init_packet(). If
5517 * avpkt->data is NULL, the encoder will allocate it.
5518 * The encoder will set avpkt->size to the size of the
5519 * output packet. The returned data (if any) belongs to the
5520 * caller, he is responsible for freeing it.
5522 * If this function fails or produces no output, avpkt will be
5523 * freed using av_packet_unref().
5524 * @param[in] frame AVFrame containing the raw video data to be encoded.
5525 * May be NULL when flushing an encoder that has the
5526 * AV_CODEC_CAP_DELAY capability set.
5527 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5528 * output packet is non-empty, and to 0 if it is
5529 * empty. If the function returns an error, the
5530 * packet can be assumed to be invalid, and the
5531 * value of got_packet_ptr is undefined and should
5533 * @return 0 on success, negative error code on failure
5535 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5537 attribute_deprecated
5538 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
5539 const AVFrame *frame, int *got_packet_ptr);
5541 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
5542 const AVSubtitle *sub);
5549 #if FF_API_AVPICTURE
5551 * @addtogroup lavc_picture
5556 * @deprecated unused
5558 attribute_deprecated
5559 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5562 * @deprecated unused
5564 attribute_deprecated
5565 void avpicture_free(AVPicture *picture);
5568 * @deprecated use av_image_fill_arrays() instead.
5570 attribute_deprecated
5571 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5572 enum AVPixelFormat pix_fmt, int width, int height);
5575 * @deprecated use av_image_copy_to_buffer() instead.
5577 attribute_deprecated
5578 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
5579 int width, int height,
5580 unsigned char *dest, int dest_size);
5583 * @deprecated use av_image_get_buffer_size() instead.
5585 attribute_deprecated
5586 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
5589 * @deprecated av_image_copy() instead.
5591 attribute_deprecated
5592 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5593 enum AVPixelFormat pix_fmt, int width, int height);
5596 * @deprecated unused
5598 attribute_deprecated
5599 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5600 enum AVPixelFormat pix_fmt, int top_band, int left_band);
5603 * @deprecated unused
5605 attribute_deprecated
5606 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5607 int padtop, int padbottom, int padleft, int padright, int *color);
5615 * @defgroup lavc_misc Utility functions
5618 * Miscellaneous utility functions related to both encoding and decoding
5624 * @defgroup lavc_misc_pixfmt Pixel formats
5626 * Functions for working with pixel formats.
5630 #if FF_API_GETCHROMA
5632 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
5635 attribute_deprecated
5636 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5640 * Return a value representing the fourCC code associated to the
5641 * pixel format pix_fmt, or 0 if no associated fourCC code can be
5644 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
5647 * @deprecated see av_get_pix_fmt_loss()
5649 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5653 * Find the best pixel format to convert to given a certain source pixel
5654 * format. When converting from one pixel format to another, information loss
5655 * may occur. For example, when converting from RGB24 to GRAY, the color
5656 * information will be lost. Similarly, other losses occur when converting from
5657 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5658 * the given pixel formats should be used to suffer the least amount of loss.
5659 * The pixel formats from which it chooses one, are determined by the
5660 * pix_fmt_list parameter.
5663 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5664 * @param[in] src_pix_fmt source pixel format
5665 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5666 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5667 * @return The best pixel format to convert to or -1 if none was found.
5669 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5670 enum AVPixelFormat src_pix_fmt,
5671 int has_alpha, int *loss_ptr);
5674 * @deprecated see av_find_best_pix_fmt_of_2()
5676 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5677 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5679 attribute_deprecated
5680 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5681 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5683 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5689 #if FF_API_TAG_STRING
5691 * Put a string representing the codec tag codec_tag in buf.
5693 * @param buf buffer to place codec tag in
5694 * @param buf_size size in bytes of buf
5695 * @param codec_tag codec tag to assign
5696 * @return the length of the string that would have been generated if
5697 * enough space had been available, excluding the trailing null
5699 * @deprecated see av_fourcc_make_string() and av_fourcc2str().
5701 attribute_deprecated
5702 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5705 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5708 * Return a name for the specified profile, if available.
5710 * @param codec the codec that is searched for the given profile
5711 * @param profile the profile value for which a name is requested
5712 * @return A name for the profile if found, NULL otherwise.
5714 const char *av_get_profile_name(const AVCodec *codec, int profile);
5717 * Return a name for the specified profile, if available.
5719 * @param codec_id the ID of the codec to which the requested profile belongs
5720 * @param profile the profile value for which a name is requested
5721 * @return A name for the profile if found, NULL otherwise.
5723 * @note unlike av_get_profile_name(), which searches a list of profiles
5724 * supported by a specific decoder or encoder implementation, this
5725 * function searches the list of profiles from the AVCodecDescriptor
5727 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
5729 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5730 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5731 //FIXME func typedef
5734 * Fill AVFrame audio data and linesize pointers.
5736 * The buffer buf must be a preallocated buffer with a size big enough
5737 * to contain the specified samples amount. The filled AVFrame data
5738 * pointers will point to this buffer.
5740 * AVFrame extended_data channel pointers are allocated if necessary for
5743 * @param frame the AVFrame
5744 * frame->nb_samples must be set prior to calling the
5745 * function. This function fills in frame->data,
5746 * frame->extended_data, frame->linesize[0].
5747 * @param nb_channels channel count
5748 * @param sample_fmt sample format
5749 * @param buf buffer to use for frame data
5750 * @param buf_size size of buffer
5751 * @param align plane size sample alignment (0 = default)
5752 * @return >=0 on success, negative error code on failure
5753 * @todo return the size in bytes required to store the samples in
5754 * case of success, at the next libavutil bump
5756 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5757 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5758 int buf_size, int align);
5761 * Reset the internal decoder state / flush internal buffers. Should be called
5762 * e.g. when seeking or when switching to a different stream.
5764 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5765 * this invalidates the frames previously returned from the decoder. When
5766 * refcounted frames are used, the decoder just releases any references it might
5767 * keep internally, but the caller's reference remains valid.
5769 void avcodec_flush_buffers(AVCodecContext *avctx);
5772 * Return codec bits per sample.
5774 * @param[in] codec_id the codec
5775 * @return Number of bits per sample or zero if unknown for the given codec.
5777 int av_get_bits_per_sample(enum AVCodecID codec_id);
5780 * Return the PCM codec associated with a sample format.
5781 * @param be endianness, 0 for little, 1 for big,
5782 * -1 (or anything else) for native
5783 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5785 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5788 * Return codec bits per sample.
5789 * Only return non-zero if the bits per sample is exactly correct, not an
5792 * @param[in] codec_id the codec
5793 * @return Number of bits per sample or zero if unknown for the given codec.
5795 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5798 * Return audio frame duration.
5800 * @param avctx codec context
5801 * @param frame_bytes size of the frame, or 0 if unknown
5802 * @return frame duration, in samples, if known. 0 if not able to
5805 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5808 * This function is the same as av_get_audio_frame_duration(), except it works
5809 * with AVCodecParameters instead of an AVCodecContext.
5811 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
5814 typedef struct AVBitStreamFilterContext {
5816 const struct AVBitStreamFilter *filter;
5817 AVCodecParserContext *parser;
5818 struct AVBitStreamFilterContext *next;
5820 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5821 * Not for access by library users.
5824 } AVBitStreamFilterContext;
5827 typedef struct AVBSFInternal AVBSFInternal;
5830 * The bitstream filter state.
5832 * This struct must be allocated with av_bsf_alloc() and freed with
5835 * The fields in the struct will only be changed (by the caller or by the
5836 * filter) as described in their documentation, and are to be considered
5837 * immutable otherwise.
5839 typedef struct AVBSFContext {
5841 * A class for logging and AVOptions
5843 const AVClass *av_class;
5846 * The bitstream filter this context is an instance of.
5848 const struct AVBitStreamFilter *filter;
5851 * Opaque libavcodec internal data. Must not be touched by the caller in any
5854 AVBSFInternal *internal;
5857 * Opaque filter-specific private data. If filter->priv_class is non-NULL,
5858 * this is an AVOptions-enabled struct.
5863 * Parameters of the input stream. This field is allocated in
5864 * av_bsf_alloc(), it needs to be filled by the caller before
5867 AVCodecParameters *par_in;
5870 * Parameters of the output stream. This field is allocated in
5871 * av_bsf_alloc(), it is set by the filter in av_bsf_init().
5873 AVCodecParameters *par_out;
5876 * The timebase used for the timestamps of the input packets. Set by the
5877 * caller before av_bsf_init().
5879 AVRational time_base_in;
5882 * The timebase used for the timestamps of the output packets. Set by the
5883 * filter in av_bsf_init().
5885 AVRational time_base_out;
5888 typedef struct AVBitStreamFilter {
5892 * A list of codec ids supported by the filter, terminated by
5894 * May be NULL, in that case the bitstream filter works with any codec id.
5896 const enum AVCodecID *codec_ids;
5899 * A class for the private data, used to declare bitstream filter private
5900 * AVOptions. This field is NULL for bitstream filters that do not declare
5903 * If this field is non-NULL, the first member of the filter private data
5904 * must be a pointer to AVClass, which will be set by libavcodec generic
5905 * code to this class.
5907 const AVClass *priv_class;
5909 /*****************************************************************
5910 * No fields below this line are part of the public API. They
5911 * may not be used outside of libavcodec and can be changed and
5913 * New public fields should be added right above.
5914 *****************************************************************
5918 int (*init)(AVBSFContext *ctx);
5919 int (*filter)(AVBSFContext *ctx, AVPacket *pkt);
5920 void (*close)(AVBSFContext *ctx);
5921 void (*flush)(AVBSFContext *ctx);
5922 } AVBitStreamFilter;
5926 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5927 * is deprecated. Use the new bitstream filtering API (using AVBSFContext).
5929 attribute_deprecated
5930 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5932 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5933 * is deprecated. Use av_bsf_get_by_name(), av_bsf_alloc(), and av_bsf_init()
5934 * from the new bitstream filtering API (using AVBSFContext).
5936 attribute_deprecated
5937 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5939 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5940 * is deprecated. Use av_bsf_send_packet() and av_bsf_receive_packet() from the
5941 * new bitstream filtering API (using AVBSFContext).
5943 attribute_deprecated
5944 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5945 AVCodecContext *avctx, const char *args,
5946 uint8_t **poutbuf, int *poutbuf_size,
5947 const uint8_t *buf, int buf_size, int keyframe);
5949 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5950 * is deprecated. Use av_bsf_free() from the new bitstream filtering API (using
5953 attribute_deprecated
5954 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5956 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5957 * is deprecated. Use av_bsf_iterate() from the new bitstream filtering API (using
5960 attribute_deprecated
5961 const AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5965 * @return a bitstream filter with the specified name or NULL if no such
5966 * bitstream filter exists.
5968 const AVBitStreamFilter *av_bsf_get_by_name(const char *name);
5971 * Iterate over all registered bitstream filters.
5973 * @param opaque a pointer where libavcodec will store the iteration state. Must
5974 * point to NULL to start the iteration.
5976 * @return the next registered bitstream filter or NULL when the iteration is
5979 const AVBitStreamFilter *av_bsf_iterate(void **opaque);
5981 attribute_deprecated
5982 const AVBitStreamFilter *av_bsf_next(void **opaque);
5986 * Allocate a context for a given bitstream filter. The caller must fill in the
5987 * context parameters as described in the documentation and then call
5988 * av_bsf_init() before sending any data to the filter.
5990 * @param filter the filter for which to allocate an instance.
5991 * @param ctx a pointer into which the pointer to the newly-allocated context
5992 * will be written. It must be freed with av_bsf_free() after the
5993 * filtering is done.
5995 * @return 0 on success, a negative AVERROR code on failure
5997 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **ctx);
6000 * Prepare the filter for use, after all the parameters and options have been
6003 int av_bsf_init(AVBSFContext *ctx);
6006 * Submit a packet for filtering.
6008 * After sending each packet, the filter must be completely drained by calling
6009 * av_bsf_receive_packet() repeatedly until it returns AVERROR(EAGAIN) or
6012 * @param pkt the packet to filter. The bitstream filter will take ownership of
6013 * the packet and reset the contents of pkt. pkt is not touched if an error occurs.
6014 * If pkt is empty (i.e. NULL, or pkt->data is NULL and pkt->side_data_elems zero),
6015 * it signals the end of the stream (i.e. no more non-empty packets will be sent;
6016 * sending more empty packets does nothing) and will cause the filter to output
6017 * any packets it may have buffered internally.
6019 * @return 0 on success, a negative AVERROR on error. This function never fails if
6022 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt);
6025 * Retrieve a filtered packet.
6027 * @param[out] pkt this struct will be filled with the contents of the filtered
6028 * packet. It is owned by the caller and must be freed using
6029 * av_packet_unref() when it is no longer needed.
6030 * This parameter should be "clean" (i.e. freshly allocated
6031 * with av_packet_alloc() or unreffed with av_packet_unref())
6032 * when this function is called. If this function returns
6033 * successfully, the contents of pkt will be completely
6034 * overwritten by the returned data. On failure, pkt is not
6037 * @return 0 on success. AVERROR(EAGAIN) if more packets need to be sent to the
6038 * filter (using av_bsf_send_packet()) to get more output. AVERROR_EOF if there
6039 * will be no further output from the filter. Another negative AVERROR value if
6042 * @note one input packet may result in several output packets, so after sending
6043 * a packet with av_bsf_send_packet(), this function needs to be called
6044 * repeatedly until it stops returning 0. It is also possible for a filter to
6045 * output fewer packets than were sent to it, so this function may return
6046 * AVERROR(EAGAIN) immediately after a successful av_bsf_send_packet() call.
6048 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt);
6051 * Reset the internal bitstream filter state / flush internal buffers.
6053 void av_bsf_flush(AVBSFContext *ctx);
6056 * Free a bitstream filter context and everything associated with it; write NULL
6057 * into the supplied pointer.
6059 void av_bsf_free(AVBSFContext **ctx);
6062 * Get the AVClass for AVBSFContext. It can be used in combination with
6063 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
6065 * @see av_opt_find().
6067 const AVClass *av_bsf_get_class(void);
6070 * Structure for chain/list of bitstream filters.
6071 * Empty list can be allocated by av_bsf_list_alloc().
6073 typedef struct AVBSFList AVBSFList;
6076 * Allocate empty list of bitstream filters.
6077 * The list must be later freed by av_bsf_list_free()
6078 * or finalized by av_bsf_list_finalize().
6080 * @return Pointer to @ref AVBSFList on success, NULL in case of failure
6082 AVBSFList *av_bsf_list_alloc(void);
6085 * Free list of bitstream filters.
6087 * @param lst Pointer to pointer returned by av_bsf_list_alloc()
6089 void av_bsf_list_free(AVBSFList **lst);
6092 * Append bitstream filter to the list of bitstream filters.
6094 * @param lst List to append to
6095 * @param bsf Filter context to be appended
6097 * @return >=0 on success, negative AVERROR in case of failure
6099 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf);
6102 * Construct new bitstream filter context given it's name and options
6103 * and append it to the list of bitstream filters.
6105 * @param lst List to append to
6106 * @param bsf_name Name of the bitstream filter
6107 * @param options Options for the bitstream filter, can be set to NULL
6109 * @return >=0 on success, negative AVERROR in case of failure
6111 int av_bsf_list_append2(AVBSFList *lst, const char * bsf_name, AVDictionary **options);
6113 * Finalize list of bitstream filters.
6115 * This function will transform @ref AVBSFList to single @ref AVBSFContext,
6116 * so the whole chain of bitstream filters can be treated as single filter
6117 * freshly allocated by av_bsf_alloc().
6118 * If the call is successful, @ref AVBSFList structure is freed and lst
6119 * will be set to NULL. In case of failure, caller is responsible for
6120 * freeing the structure by av_bsf_list_free()
6122 * @param lst Filter list structure to be transformed
6123 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6124 * representing the chain of bitstream filters
6126 * @return >=0 on success, negative AVERROR in case of failure
6128 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf);
6131 * Parse string describing list of bitstream filters and create single
6132 * @ref AVBSFContext describing the whole chain of bitstream filters.
6133 * Resulting @ref AVBSFContext can be treated as any other @ref AVBSFContext freshly
6134 * allocated by av_bsf_alloc().
6136 * @param str String describing chain of bitstream filters in format
6137 * `bsf1[=opt1=val1:opt2=val2][,bsf2]`
6138 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6139 * representing the chain of bitstream filters
6141 * @return >=0 on success, negative AVERROR in case of failure
6143 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf);
6146 * Get null/pass-through bitstream filter.
6148 * @param[out] bsf Pointer to be set to new instance of pass-through bitstream filter
6152 int av_bsf_get_null_filter(AVBSFContext **bsf);
6157 * Same behaviour av_fast_malloc but the buffer has additional
6158 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
6160 * In addition the whole buffer will initially and after resizes
6161 * be 0-initialized so that no uninitialized data will ever appear.
6163 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
6166 * Same behaviour av_fast_padded_malloc except that buffer will always
6167 * be 0-initialized after call.
6169 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
6172 * Encode extradata length to a buffer. Used by xiph codecs.
6174 * @param s buffer to write to; must be at least (v/255+1) bytes long
6175 * @param v size of extradata in bytes
6176 * @return number of bytes written to the buffer.
6178 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
6180 #if FF_API_USER_VISIBLE_AVHWACCEL
6182 * Register the hardware accelerator hwaccel.
6184 * @deprecated This function doesn't do anything.
6186 attribute_deprecated
6187 void av_register_hwaccel(AVHWAccel *hwaccel);
6190 * If hwaccel is NULL, returns the first registered hardware accelerator,
6191 * if hwaccel is non-NULL, returns the next registered hardware accelerator
6192 * after hwaccel, or NULL if hwaccel is the last one.
6194 * @deprecated AVHWaccel structures contain no user-serviceable parts, so
6195 * this function should not be used.
6197 attribute_deprecated
6198 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
6203 * Lock operation used by lockmgr
6205 * @deprecated Deprecated together with av_lockmgr_register().
6208 AV_LOCK_CREATE, ///< Create a mutex
6209 AV_LOCK_OBTAIN, ///< Lock the mutex
6210 AV_LOCK_RELEASE, ///< Unlock the mutex
6211 AV_LOCK_DESTROY, ///< Free mutex resources
6215 * Register a user provided lock manager supporting the operations
6216 * specified by AVLockOp. The "mutex" argument to the function points
6217 * to a (void *) where the lockmgr should store/get a pointer to a user
6218 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
6219 * value left by the last call for all other ops. If the lock manager is
6220 * unable to perform the op then it should leave the mutex in the same
6221 * state as when it was called and return a non-zero value. However,
6222 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
6223 * have been successfully destroyed. If av_lockmgr_register succeeds
6224 * it will return a non-negative value, if it fails it will return a
6225 * negative value and destroy all mutex and unregister all callbacks.
6226 * av_lockmgr_register is not thread-safe, it must be called from a
6227 * single thread before any calls which make use of locking are used.
6229 * @param cb User defined callback. av_lockmgr_register invokes calls
6230 * to this callback and the previously registered callback.
6231 * The callback will be used to create more than one mutex
6232 * each of which must be backed by its own underlying locking
6233 * mechanism (i.e. do not use a single static object to
6234 * implement your lock manager). If cb is set to NULL the
6235 * lockmgr will be unregistered.
6237 * @deprecated This function does nothing, and always returns 0. Be sure to
6238 * build with thread support to get basic thread safety.
6240 attribute_deprecated
6241 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
6245 * Get the type of the given codec.
6247 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
6250 * Get the name of a codec.
6251 * @return a static string identifying the codec; never NULL
6253 const char *avcodec_get_name(enum AVCodecID id);
6256 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
6257 * with no corresponding avcodec_close()), 0 otherwise.
6259 int avcodec_is_open(AVCodecContext *s);
6262 * @return a non-zero number if codec is an encoder, zero otherwise
6264 int av_codec_is_encoder(const AVCodec *codec);
6267 * @return a non-zero number if codec is a decoder, zero otherwise
6269 int av_codec_is_decoder(const AVCodec *codec);
6272 * @return descriptor for given codec ID or NULL if no descriptor exists.
6274 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
6277 * Iterate over all codec descriptors known to libavcodec.
6279 * @param prev previous descriptor. NULL to get the first descriptor.
6281 * @return next descriptor or NULL after the last descriptor
6283 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
6286 * @return codec descriptor with the given name or NULL if no such descriptor
6289 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
6292 * Allocate a CPB properties structure and initialize its fields to default
6295 * @param size if non-NULL, the size of the allocated struct will be written
6296 * here. This is useful for embedding it in side data.
6298 * @return the newly allocated struct or NULL on failure
6300 AVCPBProperties *av_cpb_properties_alloc(size_t *size);
6306 #endif /* AVCODEC_AVCODEC_H */