2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
46 * @defgroup libavc libavcodec
47 * Encoding/Decoding Library
51 * @defgroup lavc_decoding Decoding
55 * @defgroup lavc_encoding Encoding
59 * @defgroup lavc_codec Codecs
61 * @defgroup lavc_codec_native Native Codecs
64 * @defgroup lavc_codec_wrappers External library wrappers
67 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
71 * @defgroup lavc_internal Internal
79 * @defgroup lavc_encdec send/receive encoding and decoding API overview
82 * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
83 * avcodec_receive_packet() functions provide an encode/decode API, which
84 * decouples input and output.
86 * The API is very similar for encoding/decoding and audio/video, and works as
88 * - Set up and open the AVCodecContext as usual.
90 * - For decoding, call avcodec_send_packet() to give the decoder raw
91 * compressed data in an AVPacket.
92 * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
93 * containing uncompressed audio or video.
94 * In both cases, it is recommended that AVPackets and AVFrames are
95 * refcounted, or libavcodec might have to copy the input data. (libavformat
96 * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
97 * refcounted AVFrames.)
98 * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
99 * functions and process their output:
100 * - For decoding, call avcodec_receive_frame(). On success, it will return
101 * an AVFrame containing uncompressed audio or video data.
102 * - For encoding, call avcodec_receive_packet(). On success, it will return
103 * an AVPacket with a compressed frame.
104 * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
105 * AVERROR(EAGAIN) return value means that new input data is required to
106 * return new output. In this case, continue with sending input. For each
107 * input frame/packet, the codec will typically return 1 output frame/packet,
108 * but it can also be 0 or more than 1.
110 * At the beginning of decoding or encoding, the codec might accept multiple
111 * input frames/packets without returning a frame, until its internal buffers
112 * are filled. This situation is handled transparently if you follow the steps
115 * In theory, sending input can result in EAGAIN - this should happen only if
116 * not all output was received. You can use this to structure alternative decode
117 * or encode loops other than the one suggested above. For example, you could
118 * try sending new input on each iteration, and try to receive output if that
121 * End of stream situations. These require "flushing" (aka draining) the codec,
122 * as the codec might buffer multiple frames or packets internally for
123 * performance or out of necessity (consider B-frames).
124 * This is handled as follows:
125 * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
126 * or avcodec_send_frame() (encoding) functions. This will enter draining
128 * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
129 * (encoding) in a loop until AVERROR_EOF is returned. The functions will
130 * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
131 * - Before decoding can be resumed again, the codec has to be reset with
132 * avcodec_flush_buffers().
134 * Using the API as outlined above is highly recommended. But it is also
135 * possible to call functions outside of this rigid schema. For example, you can
136 * call avcodec_send_packet() repeatedly without calling
137 * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
138 * until the codec's internal buffer has been filled up (which is typically of
139 * size 1 per output frame, after initial input), and then reject input with
140 * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
141 * read at least some output.
143 * Not all codecs will follow a rigid and predictable dataflow; the only
144 * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
145 * one end implies that a receive/send call on the other end will succeed, or
146 * at least will not fail with AVERROR(EAGAIN). In general, no codec will
147 * permit unlimited buffering of input or output.
149 * This API replaces the following legacy functions:
150 * - avcodec_decode_video2() and avcodec_decode_audio4():
151 * Use avcodec_send_packet() to feed input to the decoder, then use
152 * avcodec_receive_frame() to receive decoded frames after each packet.
153 * Unlike with the old video decoding API, multiple frames might result from
154 * a packet. For audio, splitting the input packet into frames by partially
155 * decoding packets becomes transparent to the API user. You never need to
156 * feed an AVPacket to the API twice (unless it is rejected with AVERROR(EAGAIN) - then
157 * no data was read from the packet).
158 * Additionally, sending a flush/draining packet is required only once.
159 * - avcodec_encode_video2()/avcodec_encode_audio2():
160 * Use avcodec_send_frame() to feed input to the encoder, then use
161 * avcodec_receive_packet() to receive encoded packets.
162 * Providing user-allocated buffers for avcodec_receive_packet() is not
164 * - The new API does not handle subtitles yet.
166 * Mixing new and old function calls on the same AVCodecContext is not allowed,
167 * and will result in undefined behavior.
169 * Some codecs might require using the new API; using the old API will return
170 * an error when calling it. All codecs support the new API.
172 * A codec is not allowed to return AVERROR(EAGAIN) for both sending and receiving. This
173 * would be an invalid state, which could put the codec user into an endless
174 * loop. The API has no concept of time either: it cannot happen that trying to
175 * do avcodec_send_packet() results in AVERROR(EAGAIN), but a repeated call 1 second
176 * later accepts the packet (with no other receive/flush API calls involved).
177 * The API is a strict state machine, and the passage of time is not supposed
178 * to influence it. Some timing-dependent behavior might still be deemed
179 * acceptable in certain cases. But it must never result in both send/receive
180 * returning EAGAIN at the same time at any point. It must also absolutely be
181 * avoided that the current state is "unstable" and can "flip-flop" between
182 * the send/receive APIs allowing progress. For example, it's not allowed that
183 * the codec randomly decides that it actually wants to consume a packet now
184 * instead of returning a frame, after it just returned AVERROR(EAGAIN) on an
185 * avcodec_send_packet() call.
190 * @defgroup lavc_core Core functions/structures.
193 * Basic definitions, functions for querying libavcodec capabilities,
194 * allocating core structures, etc.
200 * Identify the syntax and semantics of the bitstream.
201 * The principle is roughly:
202 * Two decoders with the same ID can decode the same streams.
203 * Two encoders with the same ID can encode compatible streams.
204 * There may be slight deviations from the principle due to implementation
207 * If you add a codec ID to this list, add it so that
208 * 1. no value of an existing codec ID changes (that would break ABI),
209 * 2. it is as close as possible to similar codecs
211 * After adding new codec IDs, do not forget to add an entry to the codec
212 * descriptor list and bump libavcodec minor version.
218 AV_CODEC_ID_MPEG1VIDEO,
219 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
221 AV_CODEC_ID_MPEG2VIDEO_XVMC,
222 #endif /* FF_API_XVMC */
233 AV_CODEC_ID_RAWVIDEO,
234 AV_CODEC_ID_MSMPEG4V1,
235 AV_CODEC_ID_MSMPEG4V2,
236 AV_CODEC_ID_MSMPEG4V3,
259 AV_CODEC_ID_INTERPLAY_VIDEO,
266 AV_CODEC_ID_MSVIDEO1,
271 AV_CODEC_ID_TRUEMOTION1,
272 AV_CODEC_ID_VMDVIDEO,
297 AV_CODEC_ID_TRUEMOTION2,
303 AV_CODEC_ID_SMACKVIDEO,
308 AV_CODEC_ID_JPEG2000,
314 AV_CODEC_ID_DSICINVIDEO,
315 AV_CODEC_ID_TIERTEXSEQVIDEO,
323 AV_CODEC_ID_BETHSOFTVID,
335 AV_CODEC_ID_ESCAPE124,
339 AV_CODEC_ID_MOTIONPIXELS,
351 AV_CODEC_ID_FLASHSV2,
352 AV_CODEC_ID_CDGRAPHICS,
355 AV_CODEC_ID_BINKVIDEO,
356 AV_CODEC_ID_IFF_ILBM,
357 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
363 AV_CODEC_ID_A64_MULTI,
364 AV_CODEC_ID_A64_MULTI5,
367 AV_CODEC_ID_LAGARITH,
371 AV_CODEC_ID_WMV3IMAGE,
372 AV_CODEC_ID_VC1IMAGE,
374 AV_CODEC_ID_BMV_VIDEO,
381 AV_CODEC_ID_ZEROCODEC,
390 AV_CODEC_ID_ESCAPE130,
393 AV_CODEC_ID_HNM4_VIDEO,
395 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
397 AV_CODEC_ID_ALIAS_PIX,
398 AV_CODEC_ID_BRENDER_PIX,
399 AV_CODEC_ID_PAF_VIDEO,
412 AV_CODEC_ID_SCREENPRESSO,
415 AV_CODEC_ID_Y41P = 0x8000,
420 AV_CODEC_ID_TARGA_Y216,
432 AV_CODEC_ID_TRUEMOTION2RT,
434 AV_CODEC_ID_MAGICYUV,
435 AV_CODEC_ID_SHEERVIDEO,
442 AV_CODEC_ID_CLEARVIDEO,
445 AV_CODEC_ID_BITPACKED,
449 /* various PCM "codecs" */
450 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
451 AV_CODEC_ID_PCM_S16LE = 0x10000,
452 AV_CODEC_ID_PCM_S16BE,
453 AV_CODEC_ID_PCM_U16LE,
454 AV_CODEC_ID_PCM_U16BE,
457 AV_CODEC_ID_PCM_MULAW,
458 AV_CODEC_ID_PCM_ALAW,
459 AV_CODEC_ID_PCM_S32LE,
460 AV_CODEC_ID_PCM_S32BE,
461 AV_CODEC_ID_PCM_U32LE,
462 AV_CODEC_ID_PCM_U32BE,
463 AV_CODEC_ID_PCM_S24LE,
464 AV_CODEC_ID_PCM_S24BE,
465 AV_CODEC_ID_PCM_U24LE,
466 AV_CODEC_ID_PCM_U24BE,
467 AV_CODEC_ID_PCM_S24DAUD,
468 AV_CODEC_ID_PCM_ZORK,
469 AV_CODEC_ID_PCM_S16LE_PLANAR,
471 AV_CODEC_ID_PCM_F32BE,
472 AV_CODEC_ID_PCM_F32LE,
473 AV_CODEC_ID_PCM_F64BE,
474 AV_CODEC_ID_PCM_F64LE,
475 AV_CODEC_ID_PCM_BLURAY,
478 AV_CODEC_ID_PCM_S8_PLANAR,
479 AV_CODEC_ID_PCM_S24LE_PLANAR,
480 AV_CODEC_ID_PCM_S32LE_PLANAR,
481 AV_CODEC_ID_PCM_S16BE_PLANAR,
483 AV_CODEC_ID_PCM_S64LE = 0x10800,
484 AV_CODEC_ID_PCM_S64BE,
485 AV_CODEC_ID_PCM_F16LE,
486 AV_CODEC_ID_PCM_F24LE,
488 /* various ADPCM codecs */
489 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
490 AV_CODEC_ID_ADPCM_IMA_WAV,
491 AV_CODEC_ID_ADPCM_IMA_DK3,
492 AV_CODEC_ID_ADPCM_IMA_DK4,
493 AV_CODEC_ID_ADPCM_IMA_WS,
494 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
495 AV_CODEC_ID_ADPCM_MS,
496 AV_CODEC_ID_ADPCM_4XM,
497 AV_CODEC_ID_ADPCM_XA,
498 AV_CODEC_ID_ADPCM_ADX,
499 AV_CODEC_ID_ADPCM_EA,
500 AV_CODEC_ID_ADPCM_G726,
501 AV_CODEC_ID_ADPCM_CT,
502 AV_CODEC_ID_ADPCM_SWF,
503 AV_CODEC_ID_ADPCM_YAMAHA,
504 AV_CODEC_ID_ADPCM_SBPRO_4,
505 AV_CODEC_ID_ADPCM_SBPRO_3,
506 AV_CODEC_ID_ADPCM_SBPRO_2,
507 AV_CODEC_ID_ADPCM_THP,
508 AV_CODEC_ID_ADPCM_IMA_AMV,
509 AV_CODEC_ID_ADPCM_EA_R1,
510 AV_CODEC_ID_ADPCM_EA_R3,
511 AV_CODEC_ID_ADPCM_EA_R2,
512 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
513 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
514 AV_CODEC_ID_ADPCM_EA_XAS,
515 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
516 AV_CODEC_ID_ADPCM_IMA_ISS,
517 AV_CODEC_ID_ADPCM_G722,
518 AV_CODEC_ID_ADPCM_IMA_APC,
519 AV_CODEC_ID_ADPCM_VIMA,
520 #if FF_API_VIMA_DECODER
521 AV_CODEC_ID_VIMA = AV_CODEC_ID_ADPCM_VIMA,
524 AV_CODEC_ID_ADPCM_AFC = 0x11800,
525 AV_CODEC_ID_ADPCM_IMA_OKI,
526 AV_CODEC_ID_ADPCM_DTK,
527 AV_CODEC_ID_ADPCM_IMA_RAD,
528 AV_CODEC_ID_ADPCM_G726LE,
529 AV_CODEC_ID_ADPCM_THP_LE,
530 AV_CODEC_ID_ADPCM_PSX,
531 AV_CODEC_ID_ADPCM_AICA,
532 AV_CODEC_ID_ADPCM_IMA_DAT4,
533 AV_CODEC_ID_ADPCM_MTAF,
536 AV_CODEC_ID_AMR_NB = 0x12000,
539 /* RealAudio codecs*/
540 AV_CODEC_ID_RA_144 = 0x13000,
543 /* various DPCM codecs */
544 AV_CODEC_ID_ROQ_DPCM = 0x14000,
545 AV_CODEC_ID_INTERPLAY_DPCM,
546 AV_CODEC_ID_XAN_DPCM,
547 AV_CODEC_ID_SOL_DPCM,
549 AV_CODEC_ID_SDX2_DPCM = 0x14800,
552 AV_CODEC_ID_MP2 = 0x15000,
553 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
563 AV_CODEC_ID_VMDAUDIO,
569 AV_CODEC_ID_WESTWOOD_SND1,
570 AV_CODEC_ID_GSM, ///< as in Berlin toast format
573 AV_CODEC_ID_TRUESPEECH,
575 AV_CODEC_ID_SMACKAUDIO,
578 AV_CODEC_ID_DSICINAUDIO,
580 AV_CODEC_ID_MUSEPACK7,
582 AV_CODEC_ID_GSM_MS, /* as found in WAV */
588 AV_CODEC_ID_NELLYMOSER,
589 AV_CODEC_ID_MUSEPACK8,
591 AV_CODEC_ID_WMAVOICE,
593 AV_CODEC_ID_WMALOSSLESS,
602 AV_CODEC_ID_BINKAUDIO_RDFT,
603 AV_CODEC_ID_BINKAUDIO_DCT,
604 AV_CODEC_ID_AAC_LATM,
609 AV_CODEC_ID_8SVX_EXP,
610 AV_CODEC_ID_8SVX_FIB,
611 AV_CODEC_ID_BMV_AUDIO,
616 AV_CODEC_ID_COMFORT_NOISE,
618 AV_CODEC_ID_METASOUND,
619 AV_CODEC_ID_PAF_AUDIO,
623 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
625 AV_CODEC_ID_SONIC_LS,
628 AV_CODEC_ID_DSD_LSBF,
629 AV_CODEC_ID_DSD_MSBF,
630 AV_CODEC_ID_DSD_LSBF_PLANAR,
631 AV_CODEC_ID_DSD_MSBF_PLANAR,
633 AV_CODEC_ID_INTERPLAY_ACM,
637 AV_CODEC_ID_ATRAC3AL,
638 AV_CODEC_ID_ATRAC3PAL,
640 /* subtitle codecs */
641 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
642 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
643 AV_CODEC_ID_DVB_SUBTITLE,
644 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
647 AV_CODEC_ID_MOV_TEXT,
648 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
649 AV_CODEC_ID_DVB_TELETEXT,
652 AV_CODEC_ID_MICRODVD = 0x17800,
656 AV_CODEC_ID_REALTEXT,
658 AV_CODEC_ID_SUBVIEWER1,
659 AV_CODEC_ID_SUBVIEWER,
666 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
668 /* other specific kind of codecs (generally used for attachments) */
669 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
670 AV_CODEC_ID_TTF = 0x18000,
672 AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
673 AV_CODEC_ID_BINTEXT = 0x18800,
677 AV_CODEC_ID_SMPTE_KLV,
679 AV_CODEC_ID_TIMED_ID3,
680 AV_CODEC_ID_BIN_DATA,
683 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
685 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
686 * stream (only used by libavformat) */
687 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
688 * stream (only used by libavformat) */
689 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
690 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
694 * This struct describes the properties of a single codec described by an
696 * @see avcodec_descriptor_get()
698 typedef struct AVCodecDescriptor {
700 enum AVMediaType type;
702 * Name of the codec described by this descriptor. It is non-empty and
703 * unique for each codec descriptor. It should contain alphanumeric
704 * characters and '_' only.
708 * A more descriptive name for this codec. May be NULL.
710 const char *long_name;
712 * Codec properties, a combination of AV_CODEC_PROP_* flags.
716 * MIME type(s) associated with the codec.
717 * May be NULL; if not, a NULL-terminated array of MIME types.
718 * The first item is always non-NULL and is the preferred MIME type.
720 const char *const *mime_types;
722 * If non-NULL, an array of profiles recognized for this codec.
723 * Terminated with FF_PROFILE_UNKNOWN.
725 const struct AVProfile *profiles;
729 * Codec uses only intra compression.
730 * Video and audio codecs only.
732 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
734 * Codec supports lossy compression. Audio and video codecs only.
735 * @note a codec may support both lossy and lossless
738 #define AV_CODEC_PROP_LOSSY (1 << 1)
740 * Codec supports lossless compression. Audio and video codecs only.
742 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
744 * Codec supports frame reordering. That is, the coded order (the order in which
745 * the encoded packets are output by the encoders / stored / input to the
746 * decoders) may be different from the presentation order of the corresponding
749 * For codecs that do not have this property set, PTS and DTS should always be
752 #define AV_CODEC_PROP_REORDER (1 << 3)
754 * Subtitle codec is bitmap based
755 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
757 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
759 * Subtitle codec is text based.
760 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
762 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
765 * @ingroup lavc_decoding
766 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
767 * This is mainly needed because some optimized bitstream readers read
768 * 32 or 64 bit at once and could read over the end.<br>
769 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
770 * MPEG bitstreams could cause overread and segfault.
772 #define AV_INPUT_BUFFER_PADDING_SIZE 32
775 * @ingroup lavc_encoding
776 * minimum encoding buffer size
777 * Used to avoid some checks during header writing.
779 #define AV_INPUT_BUFFER_MIN_SIZE 16384
781 #if FF_API_WITHOUT_PREFIX
783 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
785 #define FF_INPUT_BUFFER_PADDING_SIZE 32
788 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
790 #define FF_MIN_BUFFER_SIZE 16384
791 #endif /* FF_API_WITHOUT_PREFIX */
794 * @ingroup lavc_encoding
795 * motion estimation type.
796 * @deprecated use codec private option instead
798 #if FF_API_MOTION_EST
800 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
804 ME_EPZS, ///< enhanced predictive zonal search
805 ME_X1, ///< reserved for experiments
806 ME_HEX, ///< hexagon based search
807 ME_UMH, ///< uneven multi-hexagon search
808 ME_TESA, ///< transformed exhaustive search algorithm
809 ME_ITER=50, ///< iterative search
814 * @ingroup lavc_decoding
817 /* We leave some space between them for extensions (drop some
818 * keyframes for intra-only or drop just some bidir frames). */
819 AVDISCARD_NONE =-16, ///< discard nothing
820 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
821 AVDISCARD_NONREF = 8, ///< discard all non reference
822 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
823 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
824 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
825 AVDISCARD_ALL = 48, ///< discard all
828 enum AVAudioServiceType {
829 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
830 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
831 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
832 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
833 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
834 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
835 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
836 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
837 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
838 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
842 * @ingroup lavc_encoding
844 typedef struct RcOverride{
847 int qscale; // If this is 0 then quality_factor will be used instead.
848 float quality_factor;
851 #if FF_API_MAX_BFRAMES
853 * @deprecated there is no libavcodec-wide limit on the number of B-frames
855 #define FF_MAX_B_FRAMES 16
859 These flags can be passed in AVCodecContext.flags before initialization.
860 Note: Not everything is supported yet.
864 * Allow decoders to produce frames with data planes that are not aligned
865 * to CPU requirements (e.g. due to cropping).
867 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
871 #define AV_CODEC_FLAG_QSCALE (1 << 1)
873 * 4 MV per MB allowed / advanced prediction for H.263.
875 #define AV_CODEC_FLAG_4MV (1 << 2)
877 * Output even those frames that might be corrupted.
879 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
883 #define AV_CODEC_FLAG_QPEL (1 << 4)
885 * Use internal 2pass ratecontrol in first pass mode.
887 #define AV_CODEC_FLAG_PASS1 (1 << 9)
889 * Use internal 2pass ratecontrol in second pass mode.
891 #define AV_CODEC_FLAG_PASS2 (1 << 10)
895 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
897 * Only decode/encode grayscale.
899 #define AV_CODEC_FLAG_GRAY (1 << 13)
901 * error[?] variables will be set during encoding.
903 #define AV_CODEC_FLAG_PSNR (1 << 15)
905 * Input bitstream might be truncated at a random location
906 * instead of only at frame boundaries.
908 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
910 * Use interlaced DCT.
912 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
916 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
918 * Place global headers in extradata instead of every keyframe.
920 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
922 * Use only bitexact stuff (except (I)DCT).
924 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
925 /* Fx : Flag for H.263+ extra options */
927 * H.263 advanced intra coding / MPEG-4 AC prediction
929 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
931 * interlaced motion estimation
933 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
934 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
937 * Allow non spec compliant speedup tricks.
939 #define AV_CODEC_FLAG2_FAST (1 << 0)
941 * Skip bitstream encoding.
943 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
945 * Place global headers at every keyframe instead of in extradata.
947 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
950 * timecode is in drop frame format. DEPRECATED!!!!
952 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
955 * Input bitstream might be truncated at a packet boundaries
956 * instead of only at frame boundaries.
958 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
960 * Discard cropping information from SPS.
962 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
965 * Show all frames before the first keyframe
967 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
969 * Export motion vectors through frame side data
971 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
973 * Do not skip samples and export skip information as frame side data
975 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
977 * Do not reset ASS ReadOrder field on flush (subtitles decoding)
979 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
981 /* Unsupported options :
982 * Syntax Arithmetic coding (SAC)
983 * Reference Picture Selection
984 * Independent Segment Decoding */
986 /* codec capabilities */
989 * Decoder can use draw_horiz_band callback.
991 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
993 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
994 * If not set, it might not use get_buffer() at all or use operations that
995 * assume the buffer was allocated by avcodec_default_get_buffer.
997 #define AV_CODEC_CAP_DR1 (1 << 1)
998 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
1000 * Encoder or decoder requires flushing with NULL input at the end in order to
1001 * give the complete and correct output.
1003 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1004 * with NULL data. The user can still send NULL data to the public encode
1005 * or decode function, but libavcodec will not pass it along to the codec
1006 * unless this flag is set.
1009 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1010 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1014 * The encoder needs to be fed with NULL data at the end of encoding until the
1015 * encoder no longer returns data.
1017 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1018 * flag also means that the encoder must set the pts and duration for
1019 * each output packet. If this flag is not set, the pts and duration will
1020 * be determined by libavcodec from the input frame.
1022 #define AV_CODEC_CAP_DELAY (1 << 5)
1024 * Codec can be fed a final frame with a smaller size.
1025 * This can be used to prevent truncation of the last audio samples.
1027 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
1029 #if FF_API_CAP_VDPAU
1031 * Codec can export data for HW decoding (VDPAU).
1033 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
1037 * Codec can output multiple frames per AVPacket
1038 * Normally demuxers return one frame at a time, demuxers which do not do
1039 * are connected to a parser to split what they return into proper frames.
1040 * This flag is reserved to the very rare category of codecs which have a
1041 * bitstream that cannot be split into frames without timeconsuming
1042 * operations like full decoding. Demuxers carrying such bitstreams thus
1043 * may return multiple frames in a packet. This has many disadvantages like
1044 * prohibiting stream copy in many cases thus it should only be considered
1047 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
1049 * Codec is experimental and is thus avoided in favor of non experimental
1052 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
1054 * Codec should fill in channel configuration and samplerate instead of container
1056 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
1058 * Codec supports frame-level multithreading.
1060 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
1062 * Codec supports slice-based (or partition-based) multithreading.
1064 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
1066 * Codec supports changed parameters at any point.
1068 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
1070 * Codec supports avctx->thread_count == 0 (auto).
1072 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
1074 * Audio encoder supports receiving a different number of samples in each call.
1076 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
1078 * Decoder is not a preferred choice for probing.
1079 * This indicates that the decoder is not a good choice for probing.
1080 * It could for example be an expensive to spin up hardware decoder,
1081 * or it could simply not provide a lot of useful information about
1083 * A decoder marked with this flag should only be used as last resort
1084 * choice for probing.
1086 #define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
1088 * Codec is intra only.
1090 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
1092 * Codec is lossless.
1094 #define AV_CODEC_CAP_LOSSLESS 0x80000000
1097 #if FF_API_WITHOUT_PREFIX
1099 * Allow decoders to produce frames with data planes that are not aligned
1100 * to CPU requirements (e.g. due to cropping).
1102 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
1103 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
1104 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
1105 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
1106 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
1109 * @deprecated use the "gmc" private option of the libxvid encoder
1111 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
1115 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
1116 * mpegvideo encoders
1118 #define CODEC_FLAG_MV0 0x0040
1120 #if FF_API_INPUT_PRESERVED
1122 * @deprecated passing reference-counted frames to the encoders replaces this
1125 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
1127 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
1128 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
1129 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
1132 * @deprecated edges are not used/required anymore. I.e. this flag is now always
1135 #define CODEC_FLAG_EMU_EDGE 0x4000
1137 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
1138 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
1140 #if FF_API_NORMALIZE_AQP
1142 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
1143 * mpegvideo encoders
1145 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
1147 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
1148 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
1149 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
1150 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
1151 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
1152 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
1153 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
1154 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
1155 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1156 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1157 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1158 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1159 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1161 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1162 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1163 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1164 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1166 /* Unsupported options :
1167 * Syntax Arithmetic coding (SAC)
1168 * Reference Picture Selection
1169 * Independent Segment Decoding */
1171 /* codec capabilities */
1173 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1175 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1176 * If not set, it might not use get_buffer() at all or use operations that
1177 * assume the buffer was allocated by avcodec_default_get_buffer.
1179 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1180 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1182 /* Codec can export data for HW decoding. This flag indicates that
1183 * the codec would call get_format() with list that might contain HW accelerated
1184 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1185 * including raw image format.
1186 * The application can use the passed context to determine bitstream version,
1187 * chroma format, resolution etc.
1189 #define CODEC_CAP_HWACCEL 0x0010
1190 #endif /* FF_API_XVMC */
1192 * Encoder or decoder requires flushing with NULL input at the end in order to
1193 * give the complete and correct output.
1195 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1196 * with NULL data. The user can still send NULL data to the public encode
1197 * or decode function, but libavcodec will not pass it along to the codec
1198 * unless this flag is set.
1201 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1202 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1206 * The encoder needs to be fed with NULL data at the end of encoding until the
1207 * encoder no longer returns data.
1209 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1210 * flag also means that the encoder must set the pts and duration for
1211 * each output packet. If this flag is not set, the pts and duration will
1212 * be determined by libavcodec from the input frame.
1214 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1216 * Codec can be fed a final frame with a smaller size.
1217 * This can be used to prevent truncation of the last audio samples.
1219 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1220 #if FF_API_CAP_VDPAU
1222 * Codec can export data for HW decoding (VDPAU).
1224 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1227 * Codec can output multiple frames per AVPacket
1228 * Normally demuxers return one frame at a time, demuxers which do not do
1229 * are connected to a parser to split what they return into proper frames.
1230 * This flag is reserved to the very rare category of codecs which have a
1231 * bitstream that cannot be split into frames without timeconsuming
1232 * operations like full decoding. Demuxers carrying such bitstreams thus
1233 * may return multiple frames in a packet. This has many disadvantages like
1234 * prohibiting stream copy in many cases thus it should only be considered
1237 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1239 * Codec is experimental and is thus avoided in favor of non experimental
1242 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1244 * Codec should fill in channel configuration and samplerate instead of container
1246 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1247 #if FF_API_NEG_LINESIZES
1249 * @deprecated no codecs use this capability
1251 #define CODEC_CAP_NEG_LINESIZES 0x0800
1254 * Codec supports frame-level multithreading.
1256 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1258 * Codec supports slice-based (or partition-based) multithreading.
1260 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1262 * Codec supports changed parameters at any point.
1264 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1266 * Codec supports avctx->thread_count == 0 (auto).
1268 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1270 * Audio encoder supports receiving a different number of samples in each call.
1272 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1274 * Codec is intra only.
1276 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1278 * Codec is lossless.
1280 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1283 * HWAccel is experimental and is thus avoided in favor of non experimental
1286 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1287 #endif /* FF_API_WITHOUT_PREFIX */
1290 //The following defines may change, don't expect compatibility if you use them.
1291 #define MB_TYPE_INTRA4x4 0x0001
1292 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1293 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1294 #define MB_TYPE_16x16 0x0008
1295 #define MB_TYPE_16x8 0x0010
1296 #define MB_TYPE_8x16 0x0020
1297 #define MB_TYPE_8x8 0x0040
1298 #define MB_TYPE_INTERLACED 0x0080
1299 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1300 #define MB_TYPE_ACPRED 0x0200
1301 #define MB_TYPE_GMC 0x0400
1302 #define MB_TYPE_SKIP 0x0800
1303 #define MB_TYPE_P0L0 0x1000
1304 #define MB_TYPE_P1L0 0x2000
1305 #define MB_TYPE_P0L1 0x4000
1306 #define MB_TYPE_P1L1 0x8000
1307 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1308 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1309 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1310 #define MB_TYPE_QUANT 0x00010000
1311 #define MB_TYPE_CBP 0x00020000
1312 // Note bits 24-31 are reserved for codec specific use (H.264 ref0, MPEG-1 0mv, ...)
1317 * This specifies the area which should be displayed.
1318 * Note there may be multiple such areas for one frame.
1320 typedef struct AVPanScan{
1323 * - encoding: Set by user.
1324 * - decoding: Set by libavcodec.
1329 * width and height in 1/16 pel
1330 * - encoding: Set by user.
1331 * - decoding: Set by libavcodec.
1337 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1338 * - encoding: Set by user.
1339 * - decoding: Set by libavcodec.
1341 int16_t position[3][2];
1345 * This structure describes the bitrate properties of an encoded bitstream. It
1346 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1347 * parameters for H.264/HEVC.
1349 typedef struct AVCPBProperties {
1351 * Maximum bitrate of the stream, in bits per second.
1352 * Zero if unknown or unspecified.
1356 * Minimum bitrate of the stream, in bits per second.
1357 * Zero if unknown or unspecified.
1361 * Average bitrate of the stream, in bits per second.
1362 * Zero if unknown or unspecified.
1367 * The size of the buffer to which the ratecontrol is applied, in bits.
1368 * Zero if unknown or unspecified.
1373 * The delay between the time the packet this structure is associated with
1374 * is received and the time when it should be decoded, in periods of a 27MHz
1377 * UINT64_MAX when unknown or unspecified.
1382 #if FF_API_QSCALE_TYPE
1383 #define FF_QSCALE_TYPE_MPEG1 0
1384 #define FF_QSCALE_TYPE_MPEG2 1
1385 #define FF_QSCALE_TYPE_H264 2
1386 #define FF_QSCALE_TYPE_VP56 3
1390 * The decoder will keep a reference to the frame and may reuse it later.
1392 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1395 * @defgroup lavc_packet AVPacket
1397 * Types and functions for working with AVPacket.
1400 enum AVPacketSideDataType {
1402 * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1403 * bytes worth of palette. This side data signals that a new palette is
1406 AV_PKT_DATA_PALETTE,
1409 * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1410 * that the extradata buffer was changed and the receiving side should
1411 * act upon it appropriately. The new extradata is embedded in the side
1412 * data buffer and should be immediately used for processing the current
1415 AV_PKT_DATA_NEW_EXTRADATA,
1418 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1421 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1422 * s32le channel_count
1423 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1424 * u64le channel_layout
1425 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1427 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1432 AV_PKT_DATA_PARAM_CHANGE,
1435 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1436 * structures with info about macroblocks relevant to splitting the
1437 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1438 * That is, it does not necessarily contain info about all macroblocks,
1439 * as long as the distance between macroblocks in the info is smaller
1440 * than the target payload size.
1441 * Each MB info structure is 12 bytes, and is laid out as follows:
1443 * u32le bit offset from the start of the packet
1444 * u8 current quantizer at the start of the macroblock
1446 * u16le macroblock address within the GOB
1447 * u8 horizontal MV predictor
1448 * u8 vertical MV predictor
1449 * u8 horizontal MV predictor for block number 3
1450 * u8 vertical MV predictor for block number 3
1453 AV_PKT_DATA_H263_MB_INFO,
1456 * This side data should be associated with an audio stream and contains
1457 * ReplayGain information in form of the AVReplayGain struct.
1459 AV_PKT_DATA_REPLAYGAIN,
1462 * This side data contains a 3x3 transformation matrix describing an affine
1463 * transformation that needs to be applied to the decoded video frames for
1464 * correct presentation.
1466 * See libavutil/display.h for a detailed description of the data.
1468 AV_PKT_DATA_DISPLAYMATRIX,
1471 * This side data should be associated with a video stream and contains
1472 * Stereoscopic 3D information in form of the AVStereo3D struct.
1474 AV_PKT_DATA_STEREO3D,
1477 * This side data should be associated with an audio stream and corresponds
1478 * to enum AVAudioServiceType.
1480 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1483 * This side data contains quality related information from the encoder.
1485 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1489 * u64le[error count] sum of squared differences between encoder in and output
1492 AV_PKT_DATA_QUALITY_STATS,
1495 * This side data contains an integer value representing the stream index
1496 * of a "fallback" track. A fallback track indicates an alternate
1497 * track to use when the current track can not be decoded for some reason.
1498 * e.g. no decoder available for codec.
1500 AV_PKT_DATA_FALLBACK_TRACK,
1503 * This side data corresponds to the AVCPBProperties struct.
1505 AV_PKT_DATA_CPB_PROPERTIES,
1508 * Recommmends skipping the specified number of samples
1510 * u32le number of samples to skip from start of this packet
1511 * u32le number of samples to skip from end of this packet
1512 * u8 reason for start skip
1513 * u8 reason for end skip (0=padding silence, 1=convergence)
1516 AV_PKT_DATA_SKIP_SAMPLES=70,
1519 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1520 * the packet may contain "dual mono" audio specific to Japanese DTV
1521 * and if it is true, recommends only the selected channel to be used.
1523 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1526 AV_PKT_DATA_JP_DUALMONO,
1529 * A list of zero terminated key/value strings. There is no end marker for
1530 * the list, so it is required to rely on the side data size to stop.
1532 AV_PKT_DATA_STRINGS_METADATA,
1535 * Subtitle event position
1543 AV_PKT_DATA_SUBTITLE_POSITION,
1546 * Data found in BlockAdditional element of matroska container. There is
1547 * no end marker for the data, so it is required to rely on the side data
1548 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1551 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1554 * The optional first identifier line of a WebVTT cue.
1556 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1559 * The optional settings (rendering instructions) that immediately
1560 * follow the timestamp specifier of a WebVTT cue.
1562 AV_PKT_DATA_WEBVTT_SETTINGS,
1565 * A list of zero terminated key/value strings. There is no end marker for
1566 * the list, so it is required to rely on the side data size to stop. This
1567 * side data includes updated metadata which appeared in the stream.
1569 AV_PKT_DATA_METADATA_UPDATE,
1572 * MPEGTS stream ID, this is required to pass the stream ID
1573 * information from the demuxer to the corresponding muxer.
1575 AV_PKT_DATA_MPEGTS_STREAM_ID,
1578 * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1579 * should be associated with a video stream and contains data in the form
1580 * of the AVMasteringDisplayMetadata struct.
1582 AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
1585 * This side data should be associated with a video stream and corresponds
1586 * to the AVSphericalMapping structure.
1588 AV_PKT_DATA_SPHERICAL,
1591 * Content light level (based on CTA-861.3). This metadata should be
1592 * associated with a video stream and contains data in the form of the
1593 * AVContentLightMetadata struct.
1595 AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
1598 * The number of side data elements (in fact a bit more than it).
1599 * This is not part of the public API/ABI in the sense that it may
1600 * change when new side data types are added.
1601 * This must stay the last enum value.
1602 * If its value becomes huge, some code using it
1603 * needs to be updated as it assumes it to be smaller than other limits.
1608 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1610 typedef struct AVPacketSideData {
1613 enum AVPacketSideDataType type;
1617 * This structure stores compressed data. It is typically exported by demuxers
1618 * and then passed as input to decoders, or received as output from encoders and
1619 * then passed to muxers.
1621 * For video, it should typically contain one compressed frame. For audio it may
1622 * contain several compressed frames. Encoders are allowed to output empty
1623 * packets, with no compressed data, containing only side data
1624 * (e.g. to update some stream parameters at the end of encoding).
1626 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1627 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1628 * without libavcodec and libavformat major bump.
1630 * The semantics of data ownership depends on the buf field.
1631 * If it is set, the packet data is dynamically allocated and is
1632 * valid indefinitely until a call to av_packet_unref() reduces the
1633 * reference count to 0.
1635 * If the buf field is not set av_packet_ref() would make a copy instead
1636 * of increasing the reference count.
1638 * The side data is always allocated with av_malloc(), copied by
1639 * av_packet_ref() and freed by av_packet_unref().
1641 * @see av_packet_ref
1642 * @see av_packet_unref
1644 typedef struct AVPacket {
1646 * A reference to the reference-counted buffer where the packet data is
1648 * May be NULL, then the packet data is not reference-counted.
1652 * Presentation timestamp in AVStream->time_base units; the time at which
1653 * the decompressed packet will be presented to the user.
1654 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1655 * pts MUST be larger or equal to dts as presentation cannot happen before
1656 * decompression, unless one wants to view hex dumps. Some formats misuse
1657 * the terms dts and pts/cts to mean something different. Such timestamps
1658 * must be converted to true pts/dts before they are stored in AVPacket.
1662 * Decompression timestamp in AVStream->time_base units; the time at which
1663 * the packet is decompressed.
1664 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1671 * A combination of AV_PKT_FLAG values
1675 * Additional packet data that can be provided by the container.
1676 * Packet can contain several types of side information.
1678 AVPacketSideData *side_data;
1679 int side_data_elems;
1682 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1683 * Equals next_pts - this_pts in presentation order.
1687 int64_t pos; ///< byte position in stream, -1 if unknown
1689 #if FF_API_CONVERGENCE_DURATION
1691 * @deprecated Same as the duration field, but as int64_t. This was required
1692 * for Matroska subtitles, whose duration values could overflow when the
1693 * duration field was still an int.
1695 attribute_deprecated
1696 int64_t convergence_duration;
1699 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1700 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1702 * Flag is used to discard packets which are required to maintain valid
1703 * decoder state but are not required for output and should be dropped
1706 #define AV_PKT_FLAG_DISCARD 0x0004
1708 enum AVSideDataParamChangeFlags {
1709 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1710 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1711 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1712 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1718 struct AVCodecInternal;
1722 AV_FIELD_PROGRESSIVE,
1723 AV_FIELD_TT, //< Top coded_first, top displayed first
1724 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1725 AV_FIELD_TB, //< Top coded first, bottom displayed first
1726 AV_FIELD_BT, //< Bottom coded first, top displayed first
1730 * main external API structure.
1731 * New fields can be added to the end with minor version bumps.
1732 * Removal, reordering and changes to existing fields require a major
1734 * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1736 * The name string for AVOptions options matches the associated command line
1737 * parameter name and can be found in libavcodec/options_table.h
1738 * The AVOption/command line parameter names differ in some cases from the C
1739 * structure field names for historic reasons or brevity.
1740 * sizeof(AVCodecContext) must not be used outside libav*.
1742 typedef struct AVCodecContext {
1744 * information on struct for av_log
1745 * - set by avcodec_alloc_context3
1747 const AVClass *av_class;
1748 int log_level_offset;
1750 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1751 const struct AVCodec *codec;
1752 #if FF_API_CODEC_NAME
1754 * @deprecated this field is not used for anything in libavcodec
1756 attribute_deprecated
1757 char codec_name[32];
1759 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1762 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1763 * This is used to work around some encoder bugs.
1764 * A demuxer should set this to what is stored in the field used to identify the codec.
1765 * If there are multiple such fields in a container then the demuxer should choose the one
1766 * which maximizes the information about the used codec.
1767 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1768 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1769 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1771 * - encoding: Set by user, if not then the default based on codec_id will be used.
1772 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1774 unsigned int codec_tag;
1776 #if FF_API_STREAM_CODEC_TAG
1778 * @deprecated this field is unused
1780 attribute_deprecated
1781 unsigned int stream_codec_tag;
1787 * Private context used for internal data.
1789 * Unlike priv_data, this is not codec-specific. It is used in general
1790 * libavcodec functions.
1792 struct AVCodecInternal *internal;
1795 * Private data of the user, can be used to carry app specific stuff.
1796 * - encoding: Set by user.
1797 * - decoding: Set by user.
1802 * the average bitrate
1803 * - encoding: Set by user; unused for constant quantizer encoding.
1804 * - decoding: Set by user, may be overwritten by libavcodec
1805 * if this info is available in the stream
1810 * number of bits the bitstream is allowed to diverge from the reference.
1811 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1812 * - encoding: Set by user; unused for constant quantizer encoding.
1813 * - decoding: unused
1815 int bit_rate_tolerance;
1818 * Global quality for codecs which cannot change it per frame.
1819 * This should be proportional to MPEG-1/2/4 qscale.
1820 * - encoding: Set by user.
1821 * - decoding: unused
1826 * - encoding: Set by user.
1827 * - decoding: unused
1829 int compression_level;
1830 #define FF_COMPRESSION_DEFAULT -1
1834 * - encoding: Set by user.
1835 * - decoding: Set by user.
1841 * - encoding: Set by user.
1842 * - decoding: Set by user.
1847 * some codecs need / can use extradata like Huffman tables.
1848 * MJPEG: Huffman tables
1849 * rv10: additional flags
1850 * MPEG-4: global headers (they can be in the bitstream or here)
1851 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1852 * than extradata_size to avoid problems if it is read with the bitstream reader.
1853 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1854 * - encoding: Set/allocated/freed by libavcodec.
1855 * - decoding: Set/allocated/freed by user.
1861 * This is the fundamental unit of time (in seconds) in terms
1862 * of which frame timestamps are represented. For fixed-fps content,
1863 * timebase should be 1/framerate and timestamp increments should be
1865 * This often, but not always is the inverse of the frame rate or field rate
1866 * for video. 1/time_base is not the average frame rate if the frame rate is not
1869 * Like containers, elementary streams also can store timestamps, 1/time_base
1870 * is the unit in which these timestamps are specified.
1871 * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1872 * vop_time_increment_resolution and fixed_vop_rate
1873 * (fixed_vop_rate == 0 implies that it is different from the framerate)
1875 * - encoding: MUST be set by user.
1876 * - decoding: the use of this field for decoding is deprecated.
1877 * Use framerate instead.
1879 AVRational time_base;
1882 * For some codecs, the time base is closer to the field rate than the frame rate.
1883 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1884 * if no telecine is used ...
1886 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1888 int ticks_per_frame;
1893 * Encoding: Number of frames delay there will be from the encoder input to
1894 * the decoder output. (we assume the decoder matches the spec)
1895 * Decoding: Number of frames delay in addition to what a standard decoder
1896 * as specified in the spec would produce.
1899 * Number of frames the decoded output will be delayed relative to the
1903 * For encoding, this field is unused (see initial_padding).
1905 * For decoding, this is the number of samples the decoder needs to
1906 * output before the decoder's output is valid. When seeking, you should
1907 * start decoding this many samples prior to your desired seek point.
1909 * - encoding: Set by libavcodec.
1910 * - decoding: Set by libavcodec.
1917 * picture width / height.
1919 * @note Those fields may not match the values of the last
1920 * AVFrame output by avcodec_decode_video2 due frame
1923 * - encoding: MUST be set by user.
1924 * - decoding: May be set by the user before opening the decoder if known e.g.
1925 * from the container. Some decoders will require the dimensions
1926 * to be set by the caller. During decoding, the decoder may
1927 * overwrite those values as required while parsing the data.
1932 * Bitstream width / height, may be different from width/height e.g. when
1933 * the decoded frame is cropped before being output or lowres is enabled.
1935 * @note Those field may not match the value of the last
1936 * AVFrame output by avcodec_receive_frame() due frame
1939 * - encoding: unused
1940 * - decoding: May be set by the user before opening the decoder if known
1941 * e.g. from the container. During decoding, the decoder may
1942 * overwrite those values as required while parsing the data.
1944 int coded_width, coded_height;
1946 #if FF_API_ASPECT_EXTENDED
1947 #define FF_ASPECT_EXTENDED 15
1951 * the number of pictures in a group of pictures, or 0 for intra_only
1952 * - encoding: Set by user.
1953 * - decoding: unused
1958 * Pixel format, see AV_PIX_FMT_xxx.
1959 * May be set by the demuxer if known from headers.
1960 * May be overridden by the decoder if it knows better.
1962 * @note This field may not match the value of the last
1963 * AVFrame output by avcodec_receive_frame() due frame
1966 * - encoding: Set by user.
1967 * - decoding: Set by user if known, overridden by libavcodec while
1970 enum AVPixelFormat pix_fmt;
1972 #if FF_API_MOTION_EST
1974 * This option does nothing
1975 * @deprecated use codec private options instead
1977 attribute_deprecated int me_method;
1981 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1982 * decoder to draw a horizontal band. It improves cache usage. Not
1983 * all codecs can do that. You must check the codec capabilities
1985 * When multithreading is used, it may be called from multiple threads
1986 * at the same time; threads might draw different parts of the same AVFrame,
1987 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1989 * The function is also used by hardware acceleration APIs.
1990 * It is called at least once during frame decoding to pass
1991 * the data needed for hardware render.
1992 * In that mode instead of pixel data, AVFrame points to
1993 * a structure specific to the acceleration API. The application
1994 * reads the structure and can change some fields to indicate progress
1996 * - encoding: unused
1997 * - decoding: Set by user.
1998 * @param height the height of the slice
1999 * @param y the y position of the slice
2000 * @param type 1->top field, 2->bottom field, 3->frame
2001 * @param offset offset into the AVFrame.data from which the slice should be read
2003 void (*draw_horiz_band)(struct AVCodecContext *s,
2004 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
2005 int y, int type, int height);
2008 * callback to negotiate the pixelFormat
2009 * @param fmt is the list of formats which are supported by the codec,
2010 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
2011 * The first is always the native one.
2012 * @note The callback may be called again immediately if initialization for
2013 * the selected (hardware-accelerated) pixel format failed.
2014 * @warning Behavior is undefined if the callback returns a value not
2015 * in the fmt list of formats.
2016 * @return the chosen format
2017 * - encoding: unused
2018 * - decoding: Set by user, if not set the native format will be chosen.
2020 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
2023 * maximum number of B-frames between non-B-frames
2024 * Note: The output will be delayed by max_b_frames+1 relative to the input.
2025 * - encoding: Set by user.
2026 * - decoding: unused
2031 * qscale factor between IP and B-frames
2032 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
2033 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
2034 * - encoding: Set by user.
2035 * - decoding: unused
2037 float b_quant_factor;
2039 #if FF_API_RC_STRATEGY
2040 /** @deprecated use codec private option instead */
2041 attribute_deprecated int rc_strategy;
2042 #define FF_RC_STRATEGY_XVID 1
2045 #if FF_API_PRIVATE_OPT
2046 /** @deprecated use encoder private options instead */
2047 attribute_deprecated
2048 int b_frame_strategy;
2052 * qscale offset between IP and B-frames
2053 * - encoding: Set by user.
2054 * - decoding: unused
2056 float b_quant_offset;
2059 * Size of the frame reordering buffer in the decoder.
2060 * For MPEG-2 it is 1 IPB or 0 low delay IP.
2061 * - encoding: Set by libavcodec.
2062 * - decoding: Set by libavcodec.
2066 #if FF_API_PRIVATE_OPT
2067 /** @deprecated use encoder private options instead */
2068 attribute_deprecated
2073 * qscale factor between P- and I-frames
2074 * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
2075 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
2076 * - encoding: Set by user.
2077 * - decoding: unused
2079 float i_quant_factor;
2082 * qscale offset between P and I-frames
2083 * - encoding: Set by user.
2084 * - decoding: unused
2086 float i_quant_offset;
2089 * luminance masking (0-> disabled)
2090 * - encoding: Set by user.
2091 * - decoding: unused
2096 * temporary complexity masking (0-> disabled)
2097 * - encoding: Set by user.
2098 * - decoding: unused
2100 float temporal_cplx_masking;
2103 * spatial complexity masking (0-> disabled)
2104 * - encoding: Set by user.
2105 * - decoding: unused
2107 float spatial_cplx_masking;
2110 * p block masking (0-> disabled)
2111 * - encoding: Set by user.
2112 * - decoding: unused
2117 * darkness masking (0-> disabled)
2118 * - encoding: Set by user.
2119 * - decoding: unused
2125 * - encoding: Set by libavcodec.
2126 * - decoding: Set by user (or 0).
2130 #if FF_API_PRIVATE_OPT
2131 /** @deprecated use encoder private options instead */
2132 attribute_deprecated
2133 int prediction_method;
2134 #define FF_PRED_LEFT 0
2135 #define FF_PRED_PLANE 1
2136 #define FF_PRED_MEDIAN 2
2140 * slice offsets in the frame in bytes
2141 * - encoding: Set/allocated by libavcodec.
2142 * - decoding: Set/allocated by user (or NULL).
2147 * sample aspect ratio (0 if unknown)
2148 * That is the width of a pixel divided by the height of the pixel.
2149 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
2150 * - encoding: Set by user.
2151 * - decoding: Set by libavcodec.
2153 AVRational sample_aspect_ratio;
2156 * motion estimation comparison function
2157 * - encoding: Set by user.
2158 * - decoding: unused
2162 * subpixel motion estimation comparison function
2163 * - encoding: Set by user.
2164 * - decoding: unused
2168 * macroblock comparison function (not supported yet)
2169 * - encoding: Set by user.
2170 * - decoding: unused
2174 * interlaced DCT comparison function
2175 * - encoding: Set by user.
2176 * - decoding: unused
2179 #define FF_CMP_SAD 0
2180 #define FF_CMP_SSE 1
2181 #define FF_CMP_SATD 2
2182 #define FF_CMP_DCT 3
2183 #define FF_CMP_PSNR 4
2184 #define FF_CMP_BIT 5
2186 #define FF_CMP_ZERO 7
2187 #define FF_CMP_VSAD 8
2188 #define FF_CMP_VSSE 9
2189 #define FF_CMP_NSSE 10
2190 #define FF_CMP_W53 11
2191 #define FF_CMP_W97 12
2192 #define FF_CMP_DCTMAX 13
2193 #define FF_CMP_DCT264 14
2194 #define FF_CMP_MEDIAN_SAD 15
2195 #define FF_CMP_CHROMA 256
2198 * ME diamond size & shape
2199 * - encoding: Set by user.
2200 * - decoding: unused
2205 * amount of previous MV predictors (2a+1 x 2a+1 square)
2206 * - encoding: Set by user.
2207 * - decoding: unused
2209 int last_predictor_count;
2211 #if FF_API_PRIVATE_OPT
2212 /** @deprecated use encoder private options instead */
2213 attribute_deprecated
2218 * motion estimation prepass comparison function
2219 * - encoding: Set by user.
2220 * - decoding: unused
2225 * ME prepass diamond size & shape
2226 * - encoding: Set by user.
2227 * - decoding: unused
2233 * - encoding: Set by user.
2234 * - decoding: unused
2236 int me_subpel_quality;
2240 * DTG active format information (additional aspect ratio
2241 * information only used in DVB MPEG-2 transport streams)
2244 * - encoding: unused
2245 * - decoding: Set by decoder.
2246 * @deprecated Deprecated in favor of AVSideData
2248 attribute_deprecated int dtg_active_format;
2249 #define FF_DTG_AFD_SAME 8
2250 #define FF_DTG_AFD_4_3 9
2251 #define FF_DTG_AFD_16_9 10
2252 #define FF_DTG_AFD_14_9 11
2253 #define FF_DTG_AFD_4_3_SP_14_9 13
2254 #define FF_DTG_AFD_16_9_SP_14_9 14
2255 #define FF_DTG_AFD_SP_4_3 15
2256 #endif /* FF_API_AFD */
2259 * maximum motion estimation search range in subpel units
2260 * If 0 then no limit.
2262 * - encoding: Set by user.
2263 * - decoding: unused
2267 #if FF_API_QUANT_BIAS
2269 * @deprecated use encoder private option instead
2271 attribute_deprecated int intra_quant_bias;
2272 #define FF_DEFAULT_QUANT_BIAS 999999
2275 * @deprecated use encoder private option instead
2277 attribute_deprecated int inter_quant_bias;
2282 * - encoding: unused
2283 * - decoding: Set by user.
2286 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2287 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
2288 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2292 * XVideo Motion Acceleration
2293 * - encoding: forbidden
2294 * - decoding: set by decoder
2295 * @deprecated XvMC doesn't need it anymore.
2297 attribute_deprecated int xvmc_acceleration;
2298 #endif /* FF_API_XVMC */
2301 * macroblock decision mode
2302 * - encoding: Set by user.
2303 * - decoding: unused
2306 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2307 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2308 #define FF_MB_DECISION_RD 2 ///< rate distortion
2311 * custom intra quantization matrix
2312 * - encoding: Set by user, can be NULL.
2313 * - decoding: Set by libavcodec.
2315 uint16_t *intra_matrix;
2318 * custom inter quantization matrix
2319 * - encoding: Set by user, can be NULL.
2320 * - decoding: Set by libavcodec.
2322 uint16_t *inter_matrix;
2324 #if FF_API_PRIVATE_OPT
2325 /** @deprecated use encoder private options instead */
2326 attribute_deprecated
2327 int scenechange_threshold;
2329 /** @deprecated use encoder private options instead */
2330 attribute_deprecated
2331 int noise_reduction;
2336 * @deprecated this field is unused
2338 attribute_deprecated
2342 * @deprecated this field is unused
2344 attribute_deprecated
2349 * precision of the intra DC coefficient - 8
2350 * - encoding: Set by user.
2351 * - decoding: Set by libavcodec
2353 int intra_dc_precision;
2356 * Number of macroblock rows at the top which are skipped.
2357 * - encoding: unused
2358 * - decoding: Set by user.
2363 * Number of macroblock rows at the bottom which are skipped.
2364 * - encoding: unused
2365 * - decoding: Set by user.
2371 * @deprecated use encoder private options instead
2373 attribute_deprecated
2374 float border_masking;
2378 * minimum MB Lagrange multiplier
2379 * - encoding: Set by user.
2380 * - decoding: unused
2385 * maximum MB Lagrange multiplier
2386 * - encoding: Set by user.
2387 * - decoding: unused
2391 #if FF_API_PRIVATE_OPT
2393 * @deprecated use encoder private options instead
2395 attribute_deprecated
2396 int me_penalty_compensation;
2400 * - encoding: Set by user.
2401 * - decoding: unused
2405 #if FF_API_PRIVATE_OPT
2406 /** @deprecated use encoder private options instead */
2407 attribute_deprecated
2413 * - encoding: Set by user.
2414 * - decoding: unused
2419 * number of reference frames
2420 * - encoding: Set by user.
2421 * - decoding: Set by lavc.
2425 #if FF_API_PRIVATE_OPT
2426 /** @deprecated use encoder private options instead */
2427 attribute_deprecated
2431 #if FF_API_UNUSED_MEMBERS
2433 * Multiplied by qscale for each frame and added to scene_change_score.
2434 * - encoding: Set by user.
2435 * - decoding: unused
2437 attribute_deprecated int scenechange_factor;
2441 * Note: Value depends upon the compare function used for fullpel ME.
2442 * - encoding: Set by user.
2443 * - decoding: unused
2447 #if FF_API_PRIVATE_OPT
2448 /** @deprecated use encoder private options instead */
2449 attribute_deprecated
2454 * Chromaticity coordinates of the source primaries.
2455 * - encoding: Set by user
2456 * - decoding: Set by libavcodec
2458 enum AVColorPrimaries color_primaries;
2461 * Color Transfer Characteristic.
2462 * - encoding: Set by user
2463 * - decoding: Set by libavcodec
2465 enum AVColorTransferCharacteristic color_trc;
2468 * YUV colorspace type.
2469 * - encoding: Set by user
2470 * - decoding: Set by libavcodec
2472 enum AVColorSpace colorspace;
2475 * MPEG vs JPEG YUV range.
2476 * - encoding: Set by user
2477 * - decoding: Set by libavcodec
2479 enum AVColorRange color_range;
2482 * This defines the location of chroma samples.
2483 * - encoding: Set by user
2484 * - decoding: Set by libavcodec
2486 enum AVChromaLocation chroma_sample_location;
2490 * Indicates number of picture subdivisions. Used for parallelized
2492 * - encoding: Set by user
2493 * - decoding: unused
2498 * - encoding: set by libavcodec
2499 * - decoding: Set by user.
2501 enum AVFieldOrder field_order;
2504 int sample_rate; ///< samples per second
2505 int channels; ///< number of audio channels
2508 * audio sample format
2509 * - encoding: Set by user.
2510 * - decoding: Set by libavcodec.
2512 enum AVSampleFormat sample_fmt; ///< sample format
2514 /* The following data should not be initialized. */
2516 * Number of samples per channel in an audio frame.
2518 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2519 * except the last must contain exactly frame_size samples per channel.
2520 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2521 * frame size is not restricted.
2522 * - decoding: may be set by some decoders to indicate constant frame size
2527 * Frame counter, set by libavcodec.
2529 * - decoding: total number of frames returned from the decoder so far.
2530 * - encoding: total number of frames passed to the encoder so far.
2532 * @note the counter is not incremented if encoding/decoding resulted in
2538 * number of bytes per packet if constant and known or 0
2539 * Used by some WAV based audio codecs.
2544 * Audio cutoff bandwidth (0 means "automatic")
2545 * - encoding: Set by user.
2546 * - decoding: unused
2551 * Audio channel layout.
2552 * - encoding: set by user.
2553 * - decoding: set by user, may be overwritten by libavcodec.
2555 uint64_t channel_layout;
2558 * Request decoder to use this channel layout if it can (0 for default)
2559 * - encoding: unused
2560 * - decoding: Set by user.
2562 uint64_t request_channel_layout;
2565 * Type of service that the audio stream conveys.
2566 * - encoding: Set by user.
2567 * - decoding: Set by libavcodec.
2569 enum AVAudioServiceType audio_service_type;
2572 * desired sample format
2573 * - encoding: Not used.
2574 * - decoding: Set by user.
2575 * Decoder will decode to this format if it can.
2577 enum AVSampleFormat request_sample_fmt;
2580 * This callback is called at the beginning of each frame to get data
2581 * buffer(s) for it. There may be one contiguous buffer for all the data or
2582 * there may be a buffer per each data plane or anything in between. What
2583 * this means is, you may set however many entries in buf[] you feel necessary.
2584 * Each buffer must be reference-counted using the AVBuffer API (see description
2587 * The following fields will be set in the frame before this callback is
2590 * - width, height (video only)
2591 * - sample_rate, channel_layout, nb_samples (audio only)
2592 * Their values may differ from the corresponding values in
2593 * AVCodecContext. This callback must use the frame values, not the codec
2594 * context values, to calculate the required buffer size.
2596 * This callback must fill the following fields in the frame:
2600 * * if the data is planar audio with more than 8 channels, then this
2601 * callback must allocate and fill extended_data to contain all pointers
2602 * to all data planes. data[] must hold as many pointers as it can.
2603 * extended_data must be allocated with av_malloc() and will be freed in
2605 * * otherwise extended_data must point to data
2606 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2607 * the frame's data and extended_data pointers must be contained in these. That
2608 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2609 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2610 * and av_buffer_ref().
2611 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2612 * this callback and filled with the extra buffers if there are more
2613 * buffers than buf[] can hold. extended_buf will be freed in
2616 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2617 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2620 * Each data plane must be aligned to the maximum required by the target
2623 * @see avcodec_default_get_buffer2()
2627 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2628 * (read and/or written to if it is writable) later by libavcodec.
2630 * avcodec_align_dimensions2() should be used to find the required width and
2631 * height, as they normally need to be rounded up to the next multiple of 16.
2633 * Some decoders do not support linesizes changing between frames.
2635 * If frame multithreading is used and thread_safe_callbacks is set,
2636 * this callback may be called from a different thread, but not from more
2637 * than one at once. Does not need to be reentrant.
2639 * @see avcodec_align_dimensions2()
2643 * Decoders request a buffer of a particular size by setting
2644 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2645 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2646 * to a smaller value in the output frame.
2648 * As a convenience, av_samples_get_buffer_size() and
2649 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2650 * functions to find the required data size and to fill data pointers and
2651 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2652 * since all planes must be the same size.
2654 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2656 * - encoding: unused
2657 * - decoding: Set by libavcodec, user can override.
2659 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2662 * If non-zero, the decoded audio and video frames returned from
2663 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2664 * and are valid indefinitely. The caller must free them with
2665 * av_frame_unref() when they are not needed anymore.
2666 * Otherwise, the decoded frames must not be freed by the caller and are
2667 * only valid until the next decode call.
2669 * This is always automatically enabled if avcodec_receive_frame() is used.
2671 * - encoding: unused
2672 * - decoding: set by the caller before avcodec_open2().
2674 int refcounted_frames;
2676 /* - encoding parameters */
2677 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2678 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2682 * - encoding: Set by user.
2683 * - decoding: unused
2689 * - encoding: Set by user.
2690 * - decoding: unused
2695 * maximum quantizer difference between frames
2696 * - encoding: Set by user.
2697 * - decoding: unused
2703 * @deprecated use encoder private options instead
2705 attribute_deprecated
2708 attribute_deprecated
2710 attribute_deprecated
2715 * decoder bitstream buffer size
2716 * - encoding: Set by user.
2717 * - decoding: unused
2722 * ratecontrol override, see RcOverride
2723 * - encoding: Allocated/set/freed by user.
2724 * - decoding: unused
2726 int rc_override_count;
2727 RcOverride *rc_override;
2731 * @deprecated use encoder private options instead
2733 attribute_deprecated
2739 * - encoding: Set by user.
2740 * - decoding: Set by user, may be overwritten by libavcodec.
2742 int64_t rc_max_rate;
2746 * - encoding: Set by user.
2747 * - decoding: unused
2749 int64_t rc_min_rate;
2753 * @deprecated use encoder private options instead
2755 attribute_deprecated
2756 float rc_buffer_aggressivity;
2758 attribute_deprecated
2759 float rc_initial_cplx;
2763 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2764 * - encoding: Set by user.
2765 * - decoding: unused.
2767 float rc_max_available_vbv_use;
2770 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2771 * - encoding: Set by user.
2772 * - decoding: unused.
2774 float rc_min_vbv_overflow_use;
2777 * Number of bits which should be loaded into the rc buffer before decoding starts.
2778 * - encoding: Set by user.
2779 * - decoding: unused
2781 int rc_initial_buffer_occupancy;
2783 #if FF_API_CODER_TYPE
2784 #define FF_CODER_TYPE_VLC 0
2785 #define FF_CODER_TYPE_AC 1
2786 #define FF_CODER_TYPE_RAW 2
2787 #define FF_CODER_TYPE_RLE 3
2788 #if FF_API_UNUSED_MEMBERS
2789 #define FF_CODER_TYPE_DEFLATE 4
2790 #endif /* FF_API_UNUSED_MEMBERS */
2792 * @deprecated use encoder private options instead
2794 attribute_deprecated
2796 #endif /* FF_API_CODER_TYPE */
2798 #if FF_API_PRIVATE_OPT
2799 /** @deprecated use encoder private options instead */
2800 attribute_deprecated
2806 * @deprecated use encoder private options instead
2808 attribute_deprecated
2812 * @deprecated use encoder private options instead
2814 attribute_deprecated
2818 #if FF_API_PRIVATE_OPT
2819 /** @deprecated use encoder private options instead */
2820 attribute_deprecated
2821 int frame_skip_threshold;
2823 /** @deprecated use encoder private options instead */
2824 attribute_deprecated
2825 int frame_skip_factor;
2827 /** @deprecated use encoder private options instead */
2828 attribute_deprecated
2831 /** @deprecated use encoder private options instead */
2832 attribute_deprecated
2834 #endif /* FF_API_PRIVATE_OPT */
2837 * trellis RD quantization
2838 * - encoding: Set by user.
2839 * - decoding: unused
2843 #if FF_API_PRIVATE_OPT
2844 /** @deprecated use encoder private options instead */
2845 attribute_deprecated
2846 int min_prediction_order;
2848 /** @deprecated use encoder private options instead */
2849 attribute_deprecated
2850 int max_prediction_order;
2852 /** @deprecated use encoder private options instead */
2853 attribute_deprecated
2854 int64_t timecode_frame_start;
2857 #if FF_API_RTP_CALLBACK
2859 * @deprecated unused
2861 /* The RTP callback: This function is called */
2862 /* every time the encoder has a packet to send. */
2863 /* It depends on the encoder if the data starts */
2864 /* with a Start Code (it should). H.263 does. */
2865 /* mb_nb contains the number of macroblocks */
2866 /* encoded in the RTP payload. */
2867 attribute_deprecated
2868 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2871 #if FF_API_PRIVATE_OPT
2872 /** @deprecated use encoder private options instead */
2873 attribute_deprecated
2874 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2875 /* do its best to deliver a chunk with size */
2876 /* below rtp_payload_size, the chunk will start */
2877 /* with a start code on some codecs like H.263. */
2878 /* This doesn't take account of any particular */
2879 /* headers inside the transmitted RTP payload. */
2882 #if FF_API_STAT_BITS
2883 /* statistics, used for 2-pass encoding */
2884 attribute_deprecated
2886 attribute_deprecated
2888 attribute_deprecated
2890 attribute_deprecated
2892 attribute_deprecated
2894 attribute_deprecated
2896 attribute_deprecated
2898 attribute_deprecated
2901 /** @deprecated this field is unused */
2902 attribute_deprecated
2907 * pass1 encoding statistics output buffer
2908 * - encoding: Set by libavcodec.
2909 * - decoding: unused
2914 * pass2 encoding statistics input buffer
2915 * Concatenated stuff from stats_out of pass1 should be placed here.
2916 * - encoding: Allocated/set/freed by user.
2917 * - decoding: unused
2922 * Work around bugs in encoders which sometimes cannot be detected automatically.
2923 * - encoding: Set by user
2924 * - decoding: Set by user
2926 int workaround_bugs;
2927 #define FF_BUG_AUTODETECT 1 ///< autodetection
2928 #if FF_API_OLD_MSMPEG4
2929 #define FF_BUG_OLD_MSMPEG4 2
2931 #define FF_BUG_XVID_ILACE 4
2932 #define FF_BUG_UMP4 8
2933 #define FF_BUG_NO_PADDING 16
2934 #define FF_BUG_AMV 32
2936 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2938 #define FF_BUG_QPEL_CHROMA 64
2939 #define FF_BUG_STD_QPEL 128
2940 #define FF_BUG_QPEL_CHROMA2 256
2941 #define FF_BUG_DIRECT_BLOCKSIZE 512
2942 #define FF_BUG_EDGE 1024
2943 #define FF_BUG_HPEL_CHROMA 2048
2944 #define FF_BUG_DC_CLIP 4096
2945 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2946 #define FF_BUG_TRUNCATED 16384
2947 #define FF_BUG_IEDGE 32768
2950 * strictly follow the standard (MPEG-4, ...).
2951 * - encoding: Set by user.
2952 * - decoding: Set by user.
2953 * Setting this to STRICT or higher means the encoder and decoder will
2954 * generally do stupid things, whereas setting it to unofficial or lower
2955 * will mean the encoder might produce output that is not supported by all
2956 * spec-compliant decoders. Decoders don't differentiate between normal,
2957 * unofficial and experimental (that is, they always try to decode things
2958 * when they can) unless they are explicitly asked to behave stupidly
2959 * (=strictly conform to the specs)
2961 int strict_std_compliance;
2962 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2963 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2964 #define FF_COMPLIANCE_NORMAL 0
2965 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2966 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2969 * error concealment flags
2970 * - encoding: unused
2971 * - decoding: Set by user.
2973 int error_concealment;
2974 #define FF_EC_GUESS_MVS 1
2975 #define FF_EC_DEBLOCK 2
2976 #define FF_EC_FAVOR_INTER 256
2980 * - encoding: Set by user.
2981 * - decoding: Set by user.
2984 #define FF_DEBUG_PICT_INFO 1
2985 #define FF_DEBUG_RC 2
2986 #define FF_DEBUG_BITSTREAM 4
2987 #define FF_DEBUG_MB_TYPE 8
2988 #define FF_DEBUG_QP 16
2991 * @deprecated this option does nothing
2993 #define FF_DEBUG_MV 32
2995 #define FF_DEBUG_DCT_COEFF 0x00000040
2996 #define FF_DEBUG_SKIP 0x00000080
2997 #define FF_DEBUG_STARTCODE 0x00000100
2998 #if FF_API_UNUSED_MEMBERS
2999 #define FF_DEBUG_PTS 0x00000200
3000 #endif /* FF_API_UNUSED_MEMBERS */
3001 #define FF_DEBUG_ER 0x00000400
3002 #define FF_DEBUG_MMCO 0x00000800
3003 #define FF_DEBUG_BUGS 0x00001000
3005 #define FF_DEBUG_VIS_QP 0x00002000
3006 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
3008 #define FF_DEBUG_BUFFERS 0x00008000
3009 #define FF_DEBUG_THREADS 0x00010000
3010 #define FF_DEBUG_GREEN_MD 0x00800000
3011 #define FF_DEBUG_NOMC 0x01000000
3016 * - encoding: Set by user.
3017 * - decoding: Set by user.
3020 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
3021 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
3022 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
3026 * Error recognition; may misdetect some more or less valid parts as errors.
3027 * - encoding: unused
3028 * - decoding: Set by user.
3030 int err_recognition;
3033 * Verify checksums embedded in the bitstream (could be of either encoded or
3034 * decoded data, depending on the codec) and print an error message on mismatch.
3035 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
3036 * decoder returning an error.
3038 #define AV_EF_CRCCHECK (1<<0)
3039 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
3040 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
3041 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
3043 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
3044 #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
3045 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
3046 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
3050 * opaque 64-bit number (generally a PTS) that will be reordered and
3051 * output in AVFrame.reordered_opaque
3052 * - encoding: unused
3053 * - decoding: Set by user.
3055 int64_t reordered_opaque;
3058 * Hardware accelerator in use
3059 * - encoding: unused.
3060 * - decoding: Set by libavcodec
3062 struct AVHWAccel *hwaccel;
3065 * Hardware accelerator context.
3066 * For some hardware accelerators, a global context needs to be
3067 * provided by the user. In that case, this holds display-dependent
3068 * data FFmpeg cannot instantiate itself. Please refer to the
3069 * FFmpeg HW accelerator documentation to know how to fill this
3070 * is. e.g. for VA API, this is a struct vaapi_context.
3071 * - encoding: unused
3072 * - decoding: Set by user
3074 void *hwaccel_context;
3078 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
3079 * - decoding: unused
3081 uint64_t error[AV_NUM_DATA_POINTERS];
3084 * DCT algorithm, see FF_DCT_* below
3085 * - encoding: Set by user.
3086 * - decoding: unused
3089 #define FF_DCT_AUTO 0
3090 #define FF_DCT_FASTINT 1
3091 #define FF_DCT_INT 2
3092 #define FF_DCT_MMX 3
3093 #define FF_DCT_ALTIVEC 5
3094 #define FF_DCT_FAAN 6
3097 * IDCT algorithm, see FF_IDCT_* below.
3098 * - encoding: Set by user.
3099 * - decoding: Set by user.
3102 #define FF_IDCT_AUTO 0
3103 #define FF_IDCT_INT 1
3104 #define FF_IDCT_SIMPLE 2
3105 #define FF_IDCT_SIMPLEMMX 3
3106 #define FF_IDCT_ARM 7
3107 #define FF_IDCT_ALTIVEC 8
3109 #define FF_IDCT_SH4 9
3111 #define FF_IDCT_SIMPLEARM 10
3112 #if FF_API_UNUSED_MEMBERS
3113 #define FF_IDCT_IPP 13
3114 #endif /* FF_API_UNUSED_MEMBERS */
3115 #define FF_IDCT_XVID 14
3116 #if FF_API_IDCT_XVIDMMX
3117 #define FF_IDCT_XVIDMMX 14
3118 #endif /* FF_API_IDCT_XVIDMMX */
3119 #define FF_IDCT_SIMPLEARMV5TE 16
3120 #define FF_IDCT_SIMPLEARMV6 17
3121 #if FF_API_ARCH_SPARC
3122 #define FF_IDCT_SIMPLEVIS 18
3124 #define FF_IDCT_FAAN 20
3125 #define FF_IDCT_SIMPLENEON 22
3126 #if FF_API_ARCH_ALPHA
3127 #define FF_IDCT_SIMPLEALPHA 23
3129 #define FF_IDCT_SIMPLEAUTO 128
3132 * bits per sample/pixel from the demuxer (needed for huffyuv).
3133 * - encoding: Set by libavcodec.
3134 * - decoding: Set by user.
3136 int bits_per_coded_sample;
3139 * Bits per sample/pixel of internal libavcodec pixel/sample format.
3140 * - encoding: set by user.
3141 * - decoding: set by libavcodec.
3143 int bits_per_raw_sample;
3147 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3148 * - encoding: unused
3149 * - decoding: Set by user.
3154 #if FF_API_CODED_FRAME
3156 * the picture in the bitstream
3157 * - encoding: Set by libavcodec.
3158 * - decoding: unused
3160 * @deprecated use the quality factor packet side data instead
3162 attribute_deprecated AVFrame *coded_frame;
3167 * is used to decide how many independent tasks should be passed to execute()
3168 * - encoding: Set by user.
3169 * - decoding: Set by user.
3174 * Which multithreading methods to use.
3175 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3176 * so clients which cannot provide future frames should not use it.
3178 * - encoding: Set by user, otherwise the default is used.
3179 * - decoding: Set by user, otherwise the default is used.
3182 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3183 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3186 * Which multithreading methods are in use by the codec.
3187 * - encoding: Set by libavcodec.
3188 * - decoding: Set by libavcodec.
3190 int active_thread_type;
3193 * Set by the client if its custom get_buffer() callback can be called
3194 * synchronously from another thread, which allows faster multithreaded decoding.
3195 * draw_horiz_band() will be called from other threads regardless of this setting.
3196 * Ignored if the default get_buffer() is used.
3197 * - encoding: Set by user.
3198 * - decoding: Set by user.
3200 int thread_safe_callbacks;
3203 * The codec may call this to execute several independent things.
3204 * It will return only after finishing all tasks.
3205 * The user may replace this with some multithreaded implementation,
3206 * the default implementation will execute the parts serially.
3207 * @param count the number of things to execute
3208 * - encoding: Set by libavcodec, user can override.
3209 * - decoding: Set by libavcodec, user can override.
3211 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3214 * The codec may call this to execute several independent things.
3215 * It will return only after finishing all tasks.
3216 * The user may replace this with some multithreaded implementation,
3217 * the default implementation will execute the parts serially.
3218 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3219 * @param c context passed also to func
3220 * @param count the number of things to execute
3221 * @param arg2 argument passed unchanged to func
3222 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3223 * @param func function that will be called count times, with jobnr from 0 to count-1.
3224 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3225 * two instances of func executing at the same time will have the same threadnr.
3226 * @return always 0 currently, but code should handle a future improvement where when any call to func
3227 * returns < 0 no further calls to func may be done and < 0 is returned.
3228 * - encoding: Set by libavcodec, user can override.
3229 * - decoding: Set by libavcodec, user can override.
3231 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3234 * noise vs. sse weight for the nsse comparison function
3235 * - encoding: Set by user.
3236 * - decoding: unused
3242 * - encoding: Set by user.
3243 * - decoding: Set by libavcodec.
3246 #define FF_PROFILE_UNKNOWN -99
3247 #define FF_PROFILE_RESERVED -100
3249 #define FF_PROFILE_AAC_MAIN 0
3250 #define FF_PROFILE_AAC_LOW 1
3251 #define FF_PROFILE_AAC_SSR 2
3252 #define FF_PROFILE_AAC_LTP 3
3253 #define FF_PROFILE_AAC_HE 4
3254 #define FF_PROFILE_AAC_HE_V2 28
3255 #define FF_PROFILE_AAC_LD 22
3256 #define FF_PROFILE_AAC_ELD 38
3257 #define FF_PROFILE_MPEG2_AAC_LOW 128
3258 #define FF_PROFILE_MPEG2_AAC_HE 131
3260 #define FF_PROFILE_DNXHD 0
3261 #define FF_PROFILE_DNXHR_LB 1
3262 #define FF_PROFILE_DNXHR_SQ 2
3263 #define FF_PROFILE_DNXHR_HQ 3
3264 #define FF_PROFILE_DNXHR_HQX 4
3265 #define FF_PROFILE_DNXHR_444 5
3267 #define FF_PROFILE_DTS 20
3268 #define FF_PROFILE_DTS_ES 30
3269 #define FF_PROFILE_DTS_96_24 40
3270 #define FF_PROFILE_DTS_HD_HRA 50
3271 #define FF_PROFILE_DTS_HD_MA 60
3272 #define FF_PROFILE_DTS_EXPRESS 70
3274 #define FF_PROFILE_MPEG2_422 0
3275 #define FF_PROFILE_MPEG2_HIGH 1
3276 #define FF_PROFILE_MPEG2_SS 2
3277 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3278 #define FF_PROFILE_MPEG2_MAIN 4
3279 #define FF_PROFILE_MPEG2_SIMPLE 5
3281 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3282 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3284 #define FF_PROFILE_H264_BASELINE 66
3285 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3286 #define FF_PROFILE_H264_MAIN 77
3287 #define FF_PROFILE_H264_EXTENDED 88
3288 #define FF_PROFILE_H264_HIGH 100
3289 #define FF_PROFILE_H264_HIGH_10 110
3290 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3291 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
3292 #define FF_PROFILE_H264_HIGH_422 122
3293 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3294 #define FF_PROFILE_H264_STEREO_HIGH 128
3295 #define FF_PROFILE_H264_HIGH_444 144
3296 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3297 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3298 #define FF_PROFILE_H264_CAVLC_444 44
3300 #define FF_PROFILE_VC1_SIMPLE 0
3301 #define FF_PROFILE_VC1_MAIN 1
3302 #define FF_PROFILE_VC1_COMPLEX 2
3303 #define FF_PROFILE_VC1_ADVANCED 3
3305 #define FF_PROFILE_MPEG4_SIMPLE 0
3306 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3307 #define FF_PROFILE_MPEG4_CORE 2
3308 #define FF_PROFILE_MPEG4_MAIN 3
3309 #define FF_PROFILE_MPEG4_N_BIT 4
3310 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3311 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3312 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3313 #define FF_PROFILE_MPEG4_HYBRID 8
3314 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3315 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3316 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3317 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3318 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3319 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3320 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3322 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
3323 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
3324 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
3325 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3326 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3328 #define FF_PROFILE_VP9_0 0
3329 #define FF_PROFILE_VP9_1 1
3330 #define FF_PROFILE_VP9_2 2
3331 #define FF_PROFILE_VP9_3 3
3333 #define FF_PROFILE_HEVC_MAIN 1
3334 #define FF_PROFILE_HEVC_MAIN_10 2
3335 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3336 #define FF_PROFILE_HEVC_REXT 4
3340 * - encoding: Set by user.
3341 * - decoding: Set by libavcodec.
3344 #define FF_LEVEL_UNKNOWN -99
3347 * Skip loop filtering for selected frames.
3348 * - encoding: unused
3349 * - decoding: Set by user.
3351 enum AVDiscard skip_loop_filter;
3354 * Skip IDCT/dequantization for selected frames.
3355 * - encoding: unused
3356 * - decoding: Set by user.
3358 enum AVDiscard skip_idct;
3361 * Skip decoding for selected frames.
3362 * - encoding: unused
3363 * - decoding: Set by user.
3365 enum AVDiscard skip_frame;
3368 * Header containing style information for text subtitles.
3369 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3370 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3371 * the Format line following. It shouldn't include any Dialogue line.
3372 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3373 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3375 uint8_t *subtitle_header;
3376 int subtitle_header_size;
3378 #if FF_API_ERROR_RATE
3380 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3383 attribute_deprecated
3387 #if FF_API_VBV_DELAY
3389 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3390 * Used for compliant TS muxing.
3391 * - encoding: Set by libavcodec.
3392 * - decoding: unused.
3393 * @deprecated this value is now exported as a part of
3394 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3396 attribute_deprecated
3400 #if FF_API_SIDEDATA_ONLY_PKT
3402 * Encoding only and set by default. Allow encoders to output packets
3403 * that do not contain any encoded data, only side data.
3405 * Some encoders need to output such packets, e.g. to update some stream
3406 * parameters at the end of encoding.
3408 * @deprecated this field disables the default behaviour and
3409 * it is kept only for compatibility.
3411 attribute_deprecated
3412 int side_data_only_packets;
3416 * Audio only. The number of "priming" samples (padding) inserted by the
3417 * encoder at the beginning of the audio. I.e. this number of leading
3418 * decoded samples must be discarded by the caller to get the original audio
3419 * without leading padding.
3421 * - decoding: unused
3422 * - encoding: Set by libavcodec. The timestamps on the output packets are
3423 * adjusted by the encoder so that they always refer to the
3424 * first sample of the data actually contained in the packet,
3425 * including any added padding. E.g. if the timebase is
3426 * 1/samplerate and the timestamp of the first input sample is
3427 * 0, the timestamp of the first output packet will be
3430 int initial_padding;
3433 * - decoding: For codecs that store a framerate value in the compressed
3434 * bitstream, the decoder may export it here. { 0, 1} when
3436 * - encoding: May be used to signal the framerate of CFR content to an
3439 AVRational framerate;
3442 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3443 * - encoding: unused.
3444 * - decoding: Set by libavcodec before calling get_format()
3446 enum AVPixelFormat sw_pix_fmt;
3449 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3450 * - encoding unused.
3451 * - decoding set by user.
3453 AVRational pkt_timebase;
3457 * - encoding: unused.
3458 * - decoding: set by libavcodec.
3460 const AVCodecDescriptor *codec_descriptor;
3464 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3465 * - encoding: unused
3466 * - decoding: Set by user.
3472 * Current statistics for PTS correction.
3473 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3474 * - encoding: unused
3476 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3477 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3478 int64_t pts_correction_last_pts; /// PTS of the last frame
3479 int64_t pts_correction_last_dts; /// DTS of the last frame
3482 * Character encoding of the input subtitles file.
3483 * - decoding: set by user
3484 * - encoding: unused
3489 * Subtitles character encoding mode. Formats or codecs might be adjusting
3490 * this setting (if they are doing the conversion themselves for instance).
3491 * - decoding: set by libavcodec
3492 * - encoding: unused
3494 int sub_charenc_mode;
3495 #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)
3496 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3497 #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
3500 * Skip processing alpha if supported by codec.
3501 * Note that if the format uses pre-multiplied alpha (common with VP6,
3502 * and recommended due to better video quality/compression)
3503 * the image will look as if alpha-blended onto a black background.
3504 * However for formats that do not use pre-multiplied alpha
3505 * there might be serious artefacts (though e.g. libswscale currently
3506 * assumes pre-multiplied alpha anyway).
3508 * - decoding: set by user
3509 * - encoding: unused
3514 * Number of samples to skip after a discontinuity
3515 * - decoding: unused
3516 * - encoding: set by libavcodec
3520 #if !FF_API_DEBUG_MV
3522 * debug motion vectors
3523 * - encoding: Set by user.
3524 * - decoding: Set by user.
3527 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3528 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3529 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3533 * custom intra quantization matrix
3534 * - encoding: Set by user, can be NULL.
3535 * - decoding: unused.
3537 uint16_t *chroma_intra_matrix;
3540 * dump format separator.
3541 * can be ", " or "\n " or anything else
3542 * - encoding: Set by user.
3543 * - decoding: Set by user.
3545 uint8_t *dump_separator;
3548 * ',' separated list of allowed decoders.
3549 * If NULL then all are allowed
3550 * - encoding: unused
3551 * - decoding: set by user
3553 char *codec_whitelist;
3556 * Properties of the stream that gets decoded
3557 * - encoding: unused
3558 * - decoding: set by libavcodec
3560 unsigned properties;
3561 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3562 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3565 * Additional data associated with the entire coded stream.
3567 * - decoding: unused
3568 * - encoding: may be set by libavcodec after avcodec_open2().
3570 AVPacketSideData *coded_side_data;
3571 int nb_coded_side_data;
3574 * A reference to the AVHWFramesContext describing the input (for encoding)
3575 * or output (decoding) frames. The reference is set by the caller and
3576 * afterwards owned (and freed) by libavcodec - it should never be read by
3577 * the caller after being set.
3579 * - decoding: This field should be set by the caller from the get_format()
3580 * callback. The previous reference (if any) will always be
3581 * unreffed by libavcodec before the get_format() call.
3583 * If the default get_buffer2() is used with a hwaccel pixel
3584 * format, then this AVHWFramesContext will be used for
3585 * allocating the frame buffers.
3587 * - encoding: For hardware encoders configured to use a hwaccel pixel
3588 * format, this field should be set by the caller to a reference
3589 * to the AVHWFramesContext describing input frames.
3590 * AVHWFramesContext.format must be equal to
3591 * AVCodecContext.pix_fmt.
3593 * This field should be set before avcodec_open2() is called.
3595 AVBufferRef *hw_frames_ctx;
3598 * Control the form of AVSubtitle.rects[N]->ass
3599 * - decoding: set by user
3600 * - encoding: unused
3602 int sub_text_format;
3603 #define FF_SUB_TEXT_FMT_ASS 0
3604 #if FF_API_ASS_TIMING
3605 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3609 * Audio only. The amount of padding (in samples) appended by the encoder to
3610 * the end of the audio. I.e. this number of decoded samples must be
3611 * discarded by the caller from the end of the stream to get the original
3612 * audio without any trailing padding.
3614 * - decoding: unused
3615 * - encoding: unused
3617 int trailing_padding;
3620 * The number of pixels per image to maximally accept.
3622 * - decoding: set by user
3623 * - encoding: set by user
3628 * A reference to the AVHWDeviceContext describing the device which will
3629 * be used by a hardware encoder/decoder. The reference is set by the
3630 * caller and afterwards owned (and freed) by libavcodec.
3632 * This should be used if either the codec device does not require
3633 * hardware frames or any that are used are to be allocated internally by
3634 * libavcodec. If the user wishes to supply any of the frames used as
3635 * encoder input or decoder output then hw_frames_ctx should be used
3636 * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3637 * field will be ignored while decoding the associated stream segment, but
3638 * may again be used on a following one after another get_format() call.
3640 * For both encoders and decoders this field should be set before
3641 * avcodec_open2() is called and must not be written to thereafter.
3643 * Note that some decoders may require this field to be set initially in
3644 * order to support hw_frames_ctx at all - in that case, all frames
3645 * contexts used must be created on the same device.
3647 AVBufferRef *hw_device_ctx;
3650 * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3651 * decoding (if active).
3652 * - encoding: unused
3653 * - decoding: Set by user (either before avcodec_open2(), or in the
3654 * AVCodecContext.get_format callback)
3659 * Video decoding only. Certain video codecs support cropping, meaning that
3660 * only a sub-rectangle of the decoded frame is intended for display. This
3661 * option controls how cropping is handled by libavcodec.
3663 * When set to 1 (the default), libavcodec will apply cropping internally.
3664 * I.e. it will modify the output frame width/height fields and offset the
3665 * data pointers (only by as much as possible while preserving alignment, or
3666 * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3667 * the frames output by the decoder refer only to the cropped area. The
3668 * crop_* fields of the output frames will be zero.
3670 * When set to 0, the width/height fields of the output frames will be set
3671 * to the coded dimensions and the crop_* fields will describe the cropping
3672 * rectangle. Applying the cropping is left to the caller.
3674 * @warning When hardware acceleration with opaque output frames is used,
3675 * libavcodec is unable to apply cropping from the top/left border.
3677 * @note when this option is set to zero, the width/height fields of the
3678 * AVCodecContext and output AVFrames have different meanings. The codec
3679 * context fields store display dimensions (with the coded dimensions in
3680 * coded_width/height), while the frame fields store the coded dimensions
3681 * (with the display dimensions being determined by the crop_* fields).
3686 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3687 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3689 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3690 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3692 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3694 int av_codec_get_lowres(const AVCodecContext *avctx);
3695 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3697 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3698 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3700 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3701 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3706 typedef struct AVProfile {
3708 const char *name; ///< short name for the profile
3711 typedef struct AVCodecDefault AVCodecDefault;
3718 typedef struct AVCodec {
3720 * Name of the codec implementation.
3721 * The name is globally unique among encoders and among decoders (but an
3722 * encoder and a decoder can share the same name).
3723 * This is the primary way to find a codec from the user perspective.
3727 * Descriptive name for the codec, meant to be more human readable than name.
3728 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3730 const char *long_name;
3731 enum AVMediaType type;
3734 * Codec capabilities.
3735 * see AV_CODEC_CAP_*
3738 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3739 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3740 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3741 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3742 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3743 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3744 const AVClass *priv_class; ///< AVClass for the private context
3745 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3747 /*****************************************************************
3748 * No fields below this line are part of the public API. They
3749 * may not be used outside of libavcodec and can be changed and
3751 * New public fields should be added right above.
3752 *****************************************************************
3755 struct AVCodec *next;
3757 * @name Frame-level threading support functions
3761 * If defined, called on thread contexts when they are created.
3762 * If the codec allocates writable tables in init(), re-allocate them here.
3763 * priv_data will be set to a copy of the original.
3765 int (*init_thread_copy)(AVCodecContext *);
3767 * Copy necessary context variables from a previous thread context to the current one.
3768 * If not defined, the next thread will start automatically; otherwise, the codec
3769 * must call ff_thread_finish_setup().
3771 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3773 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3777 * Private codec-specific defaults.
3779 const AVCodecDefault *defaults;
3782 * Initialize codec static data, called from avcodec_register().
3784 void (*init_static_data)(struct AVCodec *codec);
3786 int (*init)(AVCodecContext *);
3787 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3788 const struct AVSubtitle *sub);
3790 * Encode data to an AVPacket.
3792 * @param avctx codec context
3793 * @param avpkt output AVPacket (may contain a user-provided buffer)
3794 * @param[in] frame AVFrame containing the raw data to be encoded
3795 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3796 * non-empty packet was returned in avpkt.
3797 * @return 0 on success, negative error code on failure
3799 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3800 int *got_packet_ptr);
3801 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3802 int (*close)(AVCodecContext *);
3804 * Encode API with decoupled packet/frame dataflow. The API is the
3805 * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3807 * - never called if the codec is closed or the wrong type,
3808 * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3809 * - only one drain frame is ever passed down,
3811 int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
3812 int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
3815 * Decode API with decoupled packet/frame dataflow. This function is called
3816 * to get one output frame. It should call ff_decode_get_packet() to obtain