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 Encoding/Decoding Library
49 * @defgroup lavc_decoding Decoding
53 * @defgroup lavc_encoding Encoding
57 * @defgroup lavc_codec Codecs
59 * @defgroup lavc_codec_native Native Codecs
62 * @defgroup lavc_codec_wrappers External library wrappers
65 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
69 * @defgroup lavc_internal Internal
77 * @defgroup lavc_core Core functions/structures.
80 * Basic definitions, functions for querying libavcodec capabilities,
81 * allocating core structures, etc.
87 * Identify the syntax and semantics of the bitstream.
88 * The principle is roughly:
89 * Two decoders with the same ID can decode the same streams.
90 * Two encoders with the same ID can encode compatible streams.
91 * There may be slight deviations from the principle due to implementation
94 * If you add a codec ID to this list, add it so that
95 * 1. no value of a existing codec ID changes (that would break ABI),
96 * 2. it is as close as possible to similar codecs
98 * After adding new codec IDs, do not forget to add an entry to the codec
99 * descriptor list and bump libavcodec minor version.
105 AV_CODEC_ID_MPEG1VIDEO,
106 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
108 AV_CODEC_ID_MPEG2VIDEO_XVMC,
109 #endif /* FF_API_XVMC */
120 AV_CODEC_ID_RAWVIDEO,
121 AV_CODEC_ID_MSMPEG4V1,
122 AV_CODEC_ID_MSMPEG4V2,
123 AV_CODEC_ID_MSMPEG4V3,
146 AV_CODEC_ID_INTERPLAY_VIDEO,
153 AV_CODEC_ID_MSVIDEO1,
158 AV_CODEC_ID_TRUEMOTION1,
159 AV_CODEC_ID_VMDVIDEO,
184 AV_CODEC_ID_TRUEMOTION2,
190 AV_CODEC_ID_SMACKVIDEO,
195 AV_CODEC_ID_JPEG2000,
201 AV_CODEC_ID_DSICINVIDEO,
202 AV_CODEC_ID_TIERTEXSEQVIDEO,
210 AV_CODEC_ID_BETHSOFTVID,
222 AV_CODEC_ID_ESCAPE124,
226 AV_CODEC_ID_MOTIONPIXELS,
238 AV_CODEC_ID_FLASHSV2,
239 AV_CODEC_ID_CDGRAPHICS,
242 AV_CODEC_ID_BINKVIDEO,
243 AV_CODEC_ID_IFF_ILBM,
244 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
250 AV_CODEC_ID_A64_MULTI,
251 AV_CODEC_ID_A64_MULTI5,
254 AV_CODEC_ID_LAGARITH,
258 AV_CODEC_ID_WMV3IMAGE,
259 AV_CODEC_ID_VC1IMAGE,
261 AV_CODEC_ID_BMV_VIDEO,
268 AV_CODEC_ID_ZEROCODEC,
277 AV_CODEC_ID_ESCAPE130,
280 AV_CODEC_ID_HNM4_VIDEO,
282 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
284 AV_CODEC_ID_ALIAS_PIX,
285 AV_CODEC_ID_BRENDER_PIX,
286 AV_CODEC_ID_PAF_VIDEO,
299 AV_CODEC_ID_SCREENPRESSO,
302 AV_CODEC_ID_Y41P = 0x8000,
307 AV_CODEC_ID_TARGA_Y216,
319 /* various PCM "codecs" */
320 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
321 AV_CODEC_ID_PCM_S16LE = 0x10000,
322 AV_CODEC_ID_PCM_S16BE,
323 AV_CODEC_ID_PCM_U16LE,
324 AV_CODEC_ID_PCM_U16BE,
327 AV_CODEC_ID_PCM_MULAW,
328 AV_CODEC_ID_PCM_ALAW,
329 AV_CODEC_ID_PCM_S32LE,
330 AV_CODEC_ID_PCM_S32BE,
331 AV_CODEC_ID_PCM_U32LE,
332 AV_CODEC_ID_PCM_U32BE,
333 AV_CODEC_ID_PCM_S24LE,
334 AV_CODEC_ID_PCM_S24BE,
335 AV_CODEC_ID_PCM_U24LE,
336 AV_CODEC_ID_PCM_U24BE,
337 AV_CODEC_ID_PCM_S24DAUD,
338 AV_CODEC_ID_PCM_ZORK,
339 AV_CODEC_ID_PCM_S16LE_PLANAR,
341 AV_CODEC_ID_PCM_F32BE,
342 AV_CODEC_ID_PCM_F32LE,
343 AV_CODEC_ID_PCM_F64BE,
344 AV_CODEC_ID_PCM_F64LE,
345 AV_CODEC_ID_PCM_BLURAY,
348 AV_CODEC_ID_PCM_S8_PLANAR,
349 AV_CODEC_ID_PCM_S24LE_PLANAR,
350 AV_CODEC_ID_PCM_S32LE_PLANAR,
351 AV_CODEC_ID_PCM_S16BE_PLANAR,
352 /* new PCM "codecs" should be added right below this line starting with
353 * an explicit value of for example 0x10800
356 /* various ADPCM codecs */
357 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
358 AV_CODEC_ID_ADPCM_IMA_WAV,
359 AV_CODEC_ID_ADPCM_IMA_DK3,
360 AV_CODEC_ID_ADPCM_IMA_DK4,
361 AV_CODEC_ID_ADPCM_IMA_WS,
362 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
363 AV_CODEC_ID_ADPCM_MS,
364 AV_CODEC_ID_ADPCM_4XM,
365 AV_CODEC_ID_ADPCM_XA,
366 AV_CODEC_ID_ADPCM_ADX,
367 AV_CODEC_ID_ADPCM_EA,
368 AV_CODEC_ID_ADPCM_G726,
369 AV_CODEC_ID_ADPCM_CT,
370 AV_CODEC_ID_ADPCM_SWF,
371 AV_CODEC_ID_ADPCM_YAMAHA,
372 AV_CODEC_ID_ADPCM_SBPRO_4,
373 AV_CODEC_ID_ADPCM_SBPRO_3,
374 AV_CODEC_ID_ADPCM_SBPRO_2,
375 AV_CODEC_ID_ADPCM_THP,
376 AV_CODEC_ID_ADPCM_IMA_AMV,
377 AV_CODEC_ID_ADPCM_EA_R1,
378 AV_CODEC_ID_ADPCM_EA_R3,
379 AV_CODEC_ID_ADPCM_EA_R2,
380 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
381 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
382 AV_CODEC_ID_ADPCM_EA_XAS,
383 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
384 AV_CODEC_ID_ADPCM_IMA_ISS,
385 AV_CODEC_ID_ADPCM_G722,
386 AV_CODEC_ID_ADPCM_IMA_APC,
387 AV_CODEC_ID_ADPCM_VIMA,
388 #if FF_API_VIMA_DECODER
389 AV_CODEC_ID_VIMA = AV_CODEC_ID_ADPCM_VIMA,
392 AV_CODEC_ID_ADPCM_AFC = 0x11800,
393 AV_CODEC_ID_ADPCM_IMA_OKI,
394 AV_CODEC_ID_ADPCM_DTK,
395 AV_CODEC_ID_ADPCM_IMA_RAD,
396 AV_CODEC_ID_ADPCM_G726LE,
397 AV_CODEC_ID_ADPCM_THP_LE,
398 AV_CODEC_ID_ADPCM_PSX,
399 AV_CODEC_ID_ADPCM_AICA,
402 AV_CODEC_ID_AMR_NB = 0x12000,
405 /* RealAudio codecs*/
406 AV_CODEC_ID_RA_144 = 0x13000,
409 /* various DPCM codecs */
410 AV_CODEC_ID_ROQ_DPCM = 0x14000,
411 AV_CODEC_ID_INTERPLAY_DPCM,
412 AV_CODEC_ID_XAN_DPCM,
413 AV_CODEC_ID_SOL_DPCM,
415 AV_CODEC_ID_SDX2_DPCM = 0x14800,
418 AV_CODEC_ID_MP2 = 0x15000,
419 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
429 AV_CODEC_ID_VMDAUDIO,
435 AV_CODEC_ID_WESTWOOD_SND1,
436 AV_CODEC_ID_GSM, ///< as in Berlin toast format
439 AV_CODEC_ID_TRUESPEECH,
441 AV_CODEC_ID_SMACKAUDIO,
444 AV_CODEC_ID_DSICINAUDIO,
446 AV_CODEC_ID_MUSEPACK7,
448 AV_CODEC_ID_GSM_MS, /* as found in WAV */
454 AV_CODEC_ID_NELLYMOSER,
455 AV_CODEC_ID_MUSEPACK8,
457 AV_CODEC_ID_WMAVOICE,
459 AV_CODEC_ID_WMALOSSLESS,
468 AV_CODEC_ID_BINKAUDIO_RDFT,
469 AV_CODEC_ID_BINKAUDIO_DCT,
470 AV_CODEC_ID_AAC_LATM,
475 AV_CODEC_ID_8SVX_EXP,
476 AV_CODEC_ID_8SVX_FIB,
477 AV_CODEC_ID_BMV_AUDIO,
482 AV_CODEC_ID_COMFORT_NOISE,
484 AV_CODEC_ID_METASOUND,
485 AV_CODEC_ID_PAF_AUDIO,
489 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
491 AV_CODEC_ID_SONIC_LS,
494 AV_CODEC_ID_DSD_LSBF,
495 AV_CODEC_ID_DSD_MSBF,
496 AV_CODEC_ID_DSD_LSBF_PLANAR,
497 AV_CODEC_ID_DSD_MSBF_PLANAR,
499 AV_CODEC_ID_INTERPLAY_ACM,
503 /* subtitle codecs */
504 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
505 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
506 AV_CODEC_ID_DVB_SUBTITLE,
507 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
510 AV_CODEC_ID_MOV_TEXT,
511 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
512 AV_CODEC_ID_DVB_TELETEXT,
515 AV_CODEC_ID_MICRODVD = 0x17800,
519 AV_CODEC_ID_REALTEXT,
521 AV_CODEC_ID_SUBVIEWER1,
522 AV_CODEC_ID_SUBVIEWER,
529 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
531 /* other specific kind of codecs (generally used for attachments) */
532 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
533 AV_CODEC_ID_TTF = 0x18000,
535 AV_CODEC_ID_BINTEXT = 0x18800,
539 AV_CODEC_ID_SMPTE_KLV,
541 AV_CODEC_ID_TIMED_ID3,
542 AV_CODEC_ID_BIN_DATA,
545 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
547 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
548 * stream (only used by libavformat) */
549 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
550 * stream (only used by libavformat) */
551 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
552 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
556 * This struct describes the properties of a single codec described by an
558 * @see avcodec_descriptor_get()
560 typedef struct AVCodecDescriptor {
562 enum AVMediaType type;
564 * Name of the codec described by this descriptor. It is non-empty and
565 * unique for each codec descriptor. It should contain alphanumeric
566 * characters and '_' only.
570 * A more descriptive name for this codec. May be NULL.
572 const char *long_name;
574 * Codec properties, a combination of AV_CODEC_PROP_* flags.
578 * MIME type(s) associated with the codec.
579 * May be NULL; if not, a NULL-terminated array of MIME types.
580 * The first item is always non-NULL and is the preferred MIME type.
582 const char *const *mime_types;
584 * If non-NULL, an array of profiles recognized for this codec.
585 * Terminated with FF_PROFILE_UNKNOWN.
587 const struct AVProfile *profiles;
591 * Codec uses only intra compression.
594 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
596 * Codec supports lossy compression. Audio and video codecs only.
597 * @note a codec may support both lossy and lossless
600 #define AV_CODEC_PROP_LOSSY (1 << 1)
602 * Codec supports lossless compression. Audio and video codecs only.
604 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
606 * Codec supports frame reordering. That is, the coded order (the order in which
607 * the encoded packets are output by the encoders / stored / input to the
608 * decoders) may be different from the presentation order of the corresponding
611 * For codecs that do not have this property set, PTS and DTS should always be
614 #define AV_CODEC_PROP_REORDER (1 << 3)
616 * Subtitle codec is bitmap based
617 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
619 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
621 * Subtitle codec is text based.
622 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
624 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
627 * @ingroup lavc_decoding
628 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
629 * This is mainly needed because some optimized bitstream readers read
630 * 32 or 64 bit at once and could read over the end.<br>
631 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
632 * MPEG bitstreams could cause overread and segfault.
634 #define AV_INPUT_BUFFER_PADDING_SIZE 32
637 * @ingroup lavc_encoding
638 * minimum encoding buffer size
639 * Used to avoid some checks during header writing.
641 #define AV_INPUT_BUFFER_MIN_SIZE 16384
643 #if FF_API_WITHOUT_PREFIX
645 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
647 #define FF_INPUT_BUFFER_PADDING_SIZE 32
650 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
652 #define FF_MIN_BUFFER_SIZE 16384
653 #endif /* FF_API_WITHOUT_PREFIX */
656 * @ingroup lavc_encoding
657 * motion estimation type.
658 * @deprecated use codec private option instead
660 #if FF_API_MOTION_EST
662 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
666 ME_EPZS, ///< enhanced predictive zonal search
667 ME_X1, ///< reserved for experiments
668 ME_HEX, ///< hexagon based search
669 ME_UMH, ///< uneven multi-hexagon search
670 ME_TESA, ///< transformed exhaustive search algorithm
671 ME_ITER=50, ///< iterative search
676 * @ingroup lavc_decoding
679 /* We leave some space between them for extensions (drop some
680 * keyframes for intra-only or drop just some bidir frames). */
681 AVDISCARD_NONE =-16, ///< discard nothing
682 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
683 AVDISCARD_NONREF = 8, ///< discard all non reference
684 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
685 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
686 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
687 AVDISCARD_ALL = 48, ///< discard all
690 enum AVAudioServiceType {
691 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
692 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
693 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
694 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
695 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
696 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
697 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
698 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
699 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
700 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
704 * @ingroup lavc_encoding
706 typedef struct RcOverride{
709 int qscale; // If this is 0 then quality_factor will be used instead.
710 float quality_factor;
713 #if FF_API_MAX_BFRAMES
715 * @deprecated there is no libavcodec-wide limit on the number of B-frames
717 #define FF_MAX_B_FRAMES 16
721 These flags can be passed in AVCodecContext.flags before initialization.
722 Note: Not everything is supported yet.
726 * Allow decoders to produce frames with data planes that are not aligned
727 * to CPU requirements (e.g. due to cropping).
729 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
733 #define AV_CODEC_FLAG_QSCALE (1 << 1)
735 * 4 MV per MB allowed / advanced prediction for H.263.
737 #define AV_CODEC_FLAG_4MV (1 << 2)
739 * Output even those frames that might be corrupted.
741 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
745 #define AV_CODEC_FLAG_QPEL (1 << 4)
747 * Use internal 2pass ratecontrol in first pass mode.
749 #define AV_CODEC_FLAG_PASS1 (1 << 9)
751 * Use internal 2pass ratecontrol in second pass mode.
753 #define AV_CODEC_FLAG_PASS2 (1 << 10)
757 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
759 * Only decode/encode grayscale.
761 #define AV_CODEC_FLAG_GRAY (1 << 13)
763 * error[?] variables will be set during encoding.
765 #define AV_CODEC_FLAG_PSNR (1 << 15)
767 * Input bitstream might be truncated at a random location
768 * instead of only at frame boundaries.
770 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
772 * Use interlaced DCT.
774 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
778 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
780 * Place global headers in extradata instead of every keyframe.
782 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
784 * Use only bitexact stuff (except (I)DCT).
786 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
787 /* Fx : Flag for h263+ extra options */
789 * H.263 advanced intra coding / MPEG-4 AC prediction
791 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
793 * interlaced motion estimation
795 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
796 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
799 * Allow non spec compliant speedup tricks.
801 #define AV_CODEC_FLAG2_FAST (1 << 0)
803 * Skip bitstream encoding.
805 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
807 * Place global headers at every keyframe instead of in extradata.
809 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
812 * timecode is in drop frame format. DEPRECATED!!!!
814 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
817 * Input bitstream might be truncated at a packet boundaries
818 * instead of only at frame boundaries.
820 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
822 * Discard cropping information from SPS.
824 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
827 * Show all frames before the first keyframe
829 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
831 * Export motion vectors through frame side data
833 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
835 * Do not skip samples and export skip information as frame side data
837 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
839 /* Unsupported options :
840 * Syntax Arithmetic coding (SAC)
841 * Reference Picture Selection
842 * Independent Segment Decoding */
844 /* codec capabilities */
847 * Decoder can use draw_horiz_band callback.
849 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
851 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
852 * If not set, it might not use get_buffer() at all or use operations that
853 * assume the buffer was allocated by avcodec_default_get_buffer.
855 #define AV_CODEC_CAP_DR1 (1 << 1)
856 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
858 * Encoder or decoder requires flushing with NULL input at the end in order to
859 * give the complete and correct output.
861 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
862 * with NULL data. The user can still send NULL data to the public encode
863 * or decode function, but libavcodec will not pass it along to the codec
864 * unless this flag is set.
867 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
868 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
872 * The encoder needs to be fed with NULL data at the end of encoding until the
873 * encoder no longer returns data.
875 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
876 * flag also means that the encoder must set the pts and duration for
877 * each output packet. If this flag is not set, the pts and duration will
878 * be determined by libavcodec from the input frame.
880 #define AV_CODEC_CAP_DELAY (1 << 5)
882 * Codec can be fed a final frame with a smaller size.
883 * This can be used to prevent truncation of the last audio samples.
885 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
889 * Codec can export data for HW decoding (VDPAU).
891 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
895 * Codec can output multiple frames per AVPacket
896 * Normally demuxers return one frame at a time, demuxers which do not do
897 * are connected to a parser to split what they return into proper frames.
898 * This flag is reserved to the very rare category of codecs which have a
899 * bitstream that cannot be split into frames without timeconsuming
900 * operations like full decoding. Demuxers carring such bitstreams thus
901 * may return multiple frames in a packet. This has many disadvantages like
902 * prohibiting stream copy in many cases thus it should only be considered
905 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
907 * Codec is experimental and is thus avoided in favor of non experimental
910 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
912 * Codec should fill in channel configuration and samplerate instead of container
914 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
916 * Codec supports frame-level multithreading.
918 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
920 * Codec supports slice-based (or partition-based) multithreading.
922 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
924 * Codec supports changed parameters at any point.
926 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
928 * Codec supports avctx->thread_count == 0 (auto).
930 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
932 * Audio encoder supports receiving a different number of samples in each call.
934 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
936 * Codec is intra only.
938 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
942 #define AV_CODEC_CAP_LOSSLESS 0x80000000
945 #if FF_API_WITHOUT_PREFIX
947 * Allow decoders to produce frames with data planes that are not aligned
948 * to CPU requirements (e.g. due to cropping).
950 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
951 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
952 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
953 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
954 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
957 * @deprecated use the "gmc" private option of the libxvid encoder
959 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
963 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
966 #define CODEC_FLAG_MV0 0x0040
968 #if FF_API_INPUT_PRESERVED
970 * @deprecated passing reference-counted frames to the encoders replaces this
973 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
975 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
976 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
977 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
980 * @deprecated edges are not used/required anymore. I.e. this flag is now always
983 #define CODEC_FLAG_EMU_EDGE 0x4000
985 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
986 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
988 #if FF_API_NORMALIZE_AQP
990 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
993 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
995 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
996 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
997 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
998 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
999 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
1000 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
1001 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
1002 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
1003 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1004 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1005 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1006 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1007 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1009 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1010 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1011 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1012 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1014 /* Unsupported options :
1015 * Syntax Arithmetic coding (SAC)
1016 * Reference Picture Selection
1017 * Independent Segment Decoding */
1019 /* codec capabilities */
1021 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1023 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1024 * If not set, it might not use get_buffer() at all or use operations that
1025 * assume the buffer was allocated by avcodec_default_get_buffer.
1027 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1028 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1030 /* Codec can export data for HW decoding. This flag indicates that
1031 * the codec would call get_format() with list that might contain HW accelerated
1032 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1033 * including raw image format.
1034 * The application can use the passed context to determine bitstream version,
1035 * chroma format, resolution etc.
1037 #define CODEC_CAP_HWACCEL 0x0010
1038 #endif /* FF_API_XVMC */
1040 * Encoder or decoder requires flushing with NULL input at the end in order to
1041 * give the complete and correct output.
1043 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1044 * with NULL data. The user can still send NULL data to the public encode
1045 * or decode function, but libavcodec will not pass it along to the codec
1046 * unless this flag is set.
1049 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1050 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1054 * The encoder needs to be fed with NULL data at the end of encoding until the
1055 * encoder no longer returns data.
1057 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1058 * flag also means that the encoder must set the pts and duration for
1059 * each output packet. If this flag is not set, the pts and duration will
1060 * be determined by libavcodec from the input frame.
1062 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1064 * Codec can be fed a final frame with a smaller size.
1065 * This can be used to prevent truncation of the last audio samples.
1067 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1068 #if FF_API_CAP_VDPAU
1070 * Codec can export data for HW decoding (VDPAU).
1072 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1075 * Codec can output multiple frames per AVPacket
1076 * Normally demuxers return one frame at a time, demuxers which do not do
1077 * are connected to a parser to split what they return into proper frames.
1078 * This flag is reserved to the very rare category of codecs which have a
1079 * bitstream that cannot be split into frames without timeconsuming
1080 * operations like full decoding. Demuxers carring such bitstreams thus
1081 * may return multiple frames in a packet. This has many disadvantages like
1082 * prohibiting stream copy in many cases thus it should only be considered
1085 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1087 * Codec is experimental and is thus avoided in favor of non experimental
1090 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1092 * Codec should fill in channel configuration and samplerate instead of container
1094 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1095 #if FF_API_NEG_LINESIZES
1097 * @deprecated no codecs use this capability
1099 #define CODEC_CAP_NEG_LINESIZES 0x0800
1102 * Codec supports frame-level multithreading.
1104 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1106 * Codec supports slice-based (or partition-based) multithreading.
1108 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1110 * Codec supports changed parameters at any point.
1112 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1114 * Codec supports avctx->thread_count == 0 (auto).
1116 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1118 * Audio encoder supports receiving a different number of samples in each call.
1120 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1122 * Codec is intra only.
1124 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1126 * Codec is lossless.
1128 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1131 * HWAccel is experimental and is thus avoided in favor of non experimental
1134 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1135 #endif /* FF_API_WITHOUT_PREFIX */
1138 //The following defines may change, don't expect compatibility if you use them.
1139 #define MB_TYPE_INTRA4x4 0x0001
1140 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1141 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1142 #define MB_TYPE_16x16 0x0008
1143 #define MB_TYPE_16x8 0x0010
1144 #define MB_TYPE_8x16 0x0020
1145 #define MB_TYPE_8x8 0x0040
1146 #define MB_TYPE_INTERLACED 0x0080
1147 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1148 #define MB_TYPE_ACPRED 0x0200
1149 #define MB_TYPE_GMC 0x0400
1150 #define MB_TYPE_SKIP 0x0800
1151 #define MB_TYPE_P0L0 0x1000
1152 #define MB_TYPE_P1L0 0x2000
1153 #define MB_TYPE_P0L1 0x4000
1154 #define MB_TYPE_P1L1 0x8000
1155 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1156 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1157 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1158 #define MB_TYPE_QUANT 0x00010000
1159 #define MB_TYPE_CBP 0x00020000
1160 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1165 * This specifies the area which should be displayed.
1166 * Note there may be multiple such areas for one frame.
1168 typedef struct AVPanScan{
1171 * - encoding: Set by user.
1172 * - decoding: Set by libavcodec.
1177 * width and height in 1/16 pel
1178 * - encoding: Set by user.
1179 * - decoding: Set by libavcodec.
1185 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1186 * - encoding: Set by user.
1187 * - decoding: Set by libavcodec.
1189 int16_t position[3][2];
1193 * This structure describes the bitrate properties of an encoded bitstream. It
1194 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1195 * parameters for H.264/HEVC.
1197 typedef struct AVCPBProperties {
1199 * Maximum bitrate of the stream, in bits per second.
1200 * Zero if unknown or unspecified.
1204 * Minimum bitrate of the stream, in bits per second.
1205 * Zero if unknown or unspecified.
1209 * Average bitrate of the stream, in bits per second.
1210 * Zero if unknown or unspecified.
1215 * The size of the buffer to which the ratecontrol is applied, in bits.
1216 * Zero if unknown or unspecified.
1221 * The delay between the time the packet this structure is associated with
1222 * is received and the time when it should be decoded, in periods of a 27MHz
1225 * UINT64_MAX when unknown or unspecified.
1230 #if FF_API_QSCALE_TYPE
1231 #define FF_QSCALE_TYPE_MPEG1 0
1232 #define FF_QSCALE_TYPE_MPEG2 1
1233 #define FF_QSCALE_TYPE_H264 2
1234 #define FF_QSCALE_TYPE_VP56 3
1238 * The decoder will keep a reference to the frame and may reuse it later.
1240 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1243 * @defgroup lavc_packet AVPacket
1245 * Types and functions for working with AVPacket.
1248 enum AVPacketSideDataType {
1249 AV_PKT_DATA_PALETTE,
1250 AV_PKT_DATA_NEW_EXTRADATA,
1253 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1256 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1257 * s32le channel_count
1258 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1259 * u64le channel_layout
1260 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1262 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1267 AV_PKT_DATA_PARAM_CHANGE,
1270 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1271 * structures with info about macroblocks relevant to splitting the
1272 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1273 * That is, it does not necessarily contain info about all macroblocks,
1274 * as long as the distance between macroblocks in the info is smaller
1275 * than the target payload size.
1276 * Each MB info structure is 12 bytes, and is laid out as follows:
1278 * u32le bit offset from the start of the packet
1279 * u8 current quantizer at the start of the macroblock
1281 * u16le macroblock address within the GOB
1282 * u8 horizontal MV predictor
1283 * u8 vertical MV predictor
1284 * u8 horizontal MV predictor for block number 3
1285 * u8 vertical MV predictor for block number 3
1288 AV_PKT_DATA_H263_MB_INFO,
1291 * This side data should be associated with an audio stream and contains
1292 * ReplayGain information in form of the AVReplayGain struct.
1294 AV_PKT_DATA_REPLAYGAIN,
1297 * This side data contains a 3x3 transformation matrix describing an affine
1298 * transformation that needs to be applied to the decoded video frames for
1299 * correct presentation.
1301 * See libavutil/display.h for a detailed description of the data.
1303 AV_PKT_DATA_DISPLAYMATRIX,
1306 * This side data should be associated with a video stream and contains
1307 * Stereoscopic 3D information in form of the AVStereo3D struct.
1309 AV_PKT_DATA_STEREO3D,
1312 * This side data should be associated with an audio stream and corresponds
1313 * to enum AVAudioServiceType.
1315 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1318 * This side data contains quality related information from the encoder.
1320 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1324 * u64le[error count] sum of squared differences between encoder in and output
1327 AV_PKT_DATA_QUALITY_STATS,
1330 * This side data contains an integer value representing the stream index
1331 * of a "fallback" track. A fallback track indicates an alternate
1332 * track to use when the current track can not be decoded for some reason.
1333 * e.g. no decoder available for codec.
1335 AV_PKT_DATA_FALLBACK_TRACK,
1338 * This side data corresponds to the AVCPBProperties struct.
1340 AV_PKT_DATA_CPB_PROPERTIES,
1343 * Recommmends skipping the specified number of samples
1345 * u32le number of samples to skip from start of this packet
1346 * u32le number of samples to skip from end of this packet
1347 * u8 reason for start skip
1348 * u8 reason for end skip (0=padding silence, 1=convergence)
1351 AV_PKT_DATA_SKIP_SAMPLES=70,
1354 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1355 * the packet may contain "dual mono" audio specific to Japanese DTV
1356 * and if it is true, recommends only the selected channel to be used.
1358 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1361 AV_PKT_DATA_JP_DUALMONO,
1364 * A list of zero terminated key/value strings. There is no end marker for
1365 * the list, so it is required to rely on the side data size to stop.
1367 AV_PKT_DATA_STRINGS_METADATA,
1370 * Subtitle event position
1378 AV_PKT_DATA_SUBTITLE_POSITION,
1381 * Data found in BlockAdditional element of matroska container. There is
1382 * no end marker for the data, so it is required to rely on the side data
1383 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1386 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1389 * The optional first identifier line of a WebVTT cue.
1391 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1394 * The optional settings (rendering instructions) that immediately
1395 * follow the timestamp specifier of a WebVTT cue.
1397 AV_PKT_DATA_WEBVTT_SETTINGS,
1400 * A list of zero terminated key/value strings. There is no end marker for
1401 * the list, so it is required to rely on the side data size to stop. This
1402 * side data includes updated metadata which appeared in the stream.
1404 AV_PKT_DATA_METADATA_UPDATE,
1407 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1409 typedef struct AVPacketSideData {
1412 enum AVPacketSideDataType type;
1416 * This structure stores compressed data. It is typically exported by demuxers
1417 * and then passed as input to decoders, or received as output from encoders and
1418 * then passed to muxers.
1420 * For video, it should typically contain one compressed frame. For audio it may
1421 * contain several compressed frames. Encoders are allowed to output empty
1422 * packets, with no compressed data, containing only side data
1423 * (e.g. to update some stream parameters at the end of encoding).
1425 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1426 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1427 * without libavcodec and libavformat major bump.
1429 * The semantics of data ownership depends on the buf field.
1430 * If it is set, the packet data is dynamically allocated and is
1431 * valid indefinitely until a call to av_packet_unref() reduces the
1432 * reference count to 0.
1434 * If the buf field is not set av_packet_ref() would make a copy instead
1435 * of increasing the reference count.
1437 * The side data is always allocated with av_malloc(), copied by
1438 * av_packet_ref() and freed by av_packet_unref().
1440 * @see av_packet_ref
1441 * @see av_packet_unref
1443 typedef struct AVPacket {
1445 * A reference to the reference-counted buffer where the packet data is
1447 * May be NULL, then the packet data is not reference-counted.
1451 * Presentation timestamp in AVStream->time_base units; the time at which
1452 * the decompressed packet will be presented to the user.
1453 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1454 * pts MUST be larger or equal to dts as presentation cannot happen before
1455 * decompression, unless one wants to view hex dumps. Some formats misuse
1456 * the terms dts and pts/cts to mean something different. Such timestamps
1457 * must be converted to true pts/dts before they are stored in AVPacket.
1461 * Decompression timestamp in AVStream->time_base units; the time at which
1462 * the packet is decompressed.
1463 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1470 * A combination of AV_PKT_FLAG values
1474 * Additional packet data that can be provided by the container.
1475 * Packet can contain several types of side information.
1477 AVPacketSideData *side_data;
1478 int side_data_elems;
1481 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1482 * Equals next_pts - this_pts in presentation order.
1486 int64_t pos; ///< byte position in stream, -1 if unknown
1488 #if FF_API_CONVERGENCE_DURATION
1490 * @deprecated Same as the duration field, but as int64_t. This was required
1491 * for Matroska subtitles, whose duration values could overflow when the
1492 * duration field was still an int.
1494 attribute_deprecated
1495 int64_t convergence_duration;
1498 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1499 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1501 enum AVSideDataParamChangeFlags {
1502 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1503 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1504 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1505 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1511 struct AVCodecInternal;
1515 AV_FIELD_PROGRESSIVE,
1516 AV_FIELD_TT, //< Top coded_first, top displayed first
1517 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1518 AV_FIELD_TB, //< Top coded first, bottom displayed first
1519 AV_FIELD_BT, //< Bottom coded first, top displayed first
1523 * main external API structure.
1524 * New fields can be added to the end with minor version bumps.
1525 * Removal, reordering and changes to existing fields require a major
1527 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1529 * sizeof(AVCodecContext) must not be used outside libav*.
1531 typedef struct AVCodecContext {
1533 * information on struct for av_log
1534 * - set by avcodec_alloc_context3
1536 const AVClass *av_class;
1537 int log_level_offset;
1539 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1540 const struct AVCodec *codec;
1541 #if FF_API_CODEC_NAME
1543 * @deprecated this field is not used for anything in libavcodec
1545 attribute_deprecated
1546 char codec_name[32];
1548 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1551 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1552 * This is used to work around some encoder bugs.
1553 * A demuxer should set this to what is stored in the field used to identify the codec.
1554 * If there are multiple such fields in a container then the demuxer should choose the one
1555 * which maximizes the information about the used codec.
1556 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1557 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1558 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1560 * - encoding: Set by user, if not then the default based on codec_id will be used.
1561 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1563 unsigned int codec_tag;
1565 #if FF_API_STREAM_CODEC_TAG
1567 * @deprecated this field is unused
1569 attribute_deprecated
1570 unsigned int stream_codec_tag;
1576 * Private context used for internal data.
1578 * Unlike priv_data, this is not codec-specific. It is used in general
1579 * libavcodec functions.
1581 struct AVCodecInternal *internal;
1584 * Private data of the user, can be used to carry app specific stuff.
1585 * - encoding: Set by user.
1586 * - decoding: Set by user.
1591 * the average bitrate
1592 * - encoding: Set by user; unused for constant quantizer encoding.
1593 * - decoding: Set by user, may be overwritten by libavcodec
1594 * if this info is available in the stream
1599 * number of bits the bitstream is allowed to diverge from the reference.
1600 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1601 * - encoding: Set by user; unused for constant quantizer encoding.
1602 * - decoding: unused
1604 int bit_rate_tolerance;
1607 * Global quality for codecs which cannot change it per frame.
1608 * This should be proportional to MPEG-1/2/4 qscale.
1609 * - encoding: Set by user.
1610 * - decoding: unused
1615 * - encoding: Set by user.
1616 * - decoding: unused
1618 int compression_level;
1619 #define FF_COMPRESSION_DEFAULT -1
1623 * - encoding: Set by user.
1624 * - decoding: Set by user.
1630 * - encoding: Set by user.
1631 * - decoding: Set by user.
1636 * some codecs need / can use extradata like Huffman tables.
1637 * mjpeg: Huffman tables
1638 * rv10: additional flags
1639 * mpeg4: global headers (they can be in the bitstream or here)
1640 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1641 * than extradata_size to avoid problems if it is read with the bitstream reader.
1642 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1643 * - encoding: Set/allocated/freed by libavcodec.
1644 * - decoding: Set/allocated/freed by user.
1650 * This is the fundamental unit of time (in seconds) in terms
1651 * of which frame timestamps are represented. For fixed-fps content,
1652 * timebase should be 1/framerate and timestamp increments should be
1654 * This often, but not always is the inverse of the frame rate or field rate
1656 * - encoding: MUST be set by user.
1657 * - decoding: the use of this field for decoding is deprecated.
1658 * Use framerate instead.
1660 AVRational time_base;
1663 * For some codecs, the time base is closer to the field rate than the frame rate.
1664 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1665 * if no telecine is used ...
1667 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1669 int ticks_per_frame;
1674 * Encoding: Number of frames delay there will be from the encoder input to
1675 * the decoder output. (we assume the decoder matches the spec)
1676 * Decoding: Number of frames delay in addition to what a standard decoder
1677 * as specified in the spec would produce.
1680 * Number of frames the decoded output will be delayed relative to the
1684 * For encoding, this field is unused (see initial_padding).
1686 * For decoding, this is the number of samples the decoder needs to
1687 * output before the decoder's output is valid. When seeking, you should
1688 * start decoding this many samples prior to your desired seek point.
1690 * - encoding: Set by libavcodec.
1691 * - decoding: Set by libavcodec.
1698 * picture width / height.
1700 * @note Those fields may not match the values of the last
1701 * AVFrame outputted by avcodec_decode_video2 due frame
1704 * - encoding: MUST be set by user.
1705 * - decoding: May be set by the user before opening the decoder if known e.g.
1706 * from the container. Some decoders will require the dimensions
1707 * to be set by the caller. During decoding, the decoder may
1708 * overwrite those values as required while parsing the data.
1713 * Bitstream width / height, may be different from width/height e.g. when
1714 * the decoded frame is cropped before being output or lowres is enabled.
1716 * @note Those field may not match the value of the last
1717 * AVFrame outputted by avcodec_decode_video2 due frame
1720 * - encoding: unused
1721 * - decoding: May be set by the user before opening the decoder if known
1722 * e.g. from the container. During decoding, the decoder may
1723 * overwrite those values as required while parsing the data.
1725 int coded_width, coded_height;
1727 #if FF_API_ASPECT_EXTENDED
1728 #define FF_ASPECT_EXTENDED 15
1732 * the number of pictures in a group of pictures, or 0 for intra_only
1733 * - encoding: Set by user.
1734 * - decoding: unused
1739 * Pixel format, see AV_PIX_FMT_xxx.
1740 * May be set by the demuxer if known from headers.
1741 * May be overridden by the decoder if it knows better.
1743 * @note This field may not match the value of the last
1744 * AVFrame outputted by avcodec_decode_video2 due frame
1747 * - encoding: Set by user.
1748 * - decoding: Set by user if known, overridden by libavcodec while
1751 enum AVPixelFormat pix_fmt;
1753 #if FF_API_MOTION_EST
1755 * This option does nothing
1756 * @deprecated use codec private options instead
1758 attribute_deprecated int me_method;
1762 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1763 * decoder to draw a horizontal band. It improves cache usage. Not
1764 * all codecs can do that. You must check the codec capabilities
1766 * When multithreading is used, it may be called from multiple threads
1767 * at the same time; threads might draw different parts of the same AVFrame,
1768 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1770 * The function is also used by hardware acceleration APIs.
1771 * It is called at least once during frame decoding to pass
1772 * the data needed for hardware render.
1773 * In that mode instead of pixel data, AVFrame points to
1774 * a structure specific to the acceleration API. The application
1775 * reads the structure and can change some fields to indicate progress
1777 * - encoding: unused
1778 * - decoding: Set by user.
1779 * @param height the height of the slice
1780 * @param y the y position of the slice
1781 * @param type 1->top field, 2->bottom field, 3->frame
1782 * @param offset offset into the AVFrame.data from which the slice should be read
1784 void (*draw_horiz_band)(struct AVCodecContext *s,
1785 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1786 int y, int type, int height);
1789 * callback to negotiate the pixelFormat
1790 * @param fmt is the list of formats which are supported by the codec,
1791 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1792 * The first is always the native one.
1793 * @note The callback may be called again immediately if initialization for
1794 * the selected (hardware-accelerated) pixel format failed.
1795 * @warning Behavior is undefined if the callback returns a value not
1796 * in the fmt list of formats.
1797 * @return the chosen format
1798 * - encoding: unused
1799 * - decoding: Set by user, if not set the native format will be chosen.
1801 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1804 * maximum number of B-frames between non-B-frames
1805 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1806 * - encoding: Set by user.
1807 * - decoding: unused
1812 * qscale factor between IP and B-frames
1813 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1814 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1815 * - encoding: Set by user.
1816 * - decoding: unused
1818 float b_quant_factor;
1820 #if FF_API_RC_STRATEGY
1821 /** @deprecated use codec private option instead */
1822 attribute_deprecated int rc_strategy;
1823 #define FF_RC_STRATEGY_XVID 1
1826 int b_frame_strategy;
1829 * qscale offset between IP and B-frames
1830 * - encoding: Set by user.
1831 * - decoding: unused
1833 float b_quant_offset;
1836 * Size of the frame reordering buffer in the decoder.
1837 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1838 * - encoding: Set by libavcodec.
1839 * - decoding: Set by libavcodec.
1844 * 0-> h263 quant 1-> mpeg quant
1845 * - encoding: Set by user.
1846 * - decoding: unused
1851 * qscale factor between P and I-frames
1852 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1853 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1854 * - encoding: Set by user.
1855 * - decoding: unused
1857 float i_quant_factor;
1860 * qscale offset between P and I-frames
1861 * - encoding: Set by user.
1862 * - decoding: unused
1864 float i_quant_offset;
1867 * luminance masking (0-> disabled)
1868 * - encoding: Set by user.
1869 * - decoding: unused
1874 * temporary complexity masking (0-> disabled)
1875 * - encoding: Set by user.
1876 * - decoding: unused
1878 float temporal_cplx_masking;
1881 * spatial complexity masking (0-> disabled)
1882 * - encoding: Set by user.
1883 * - decoding: unused
1885 float spatial_cplx_masking;
1888 * p block masking (0-> disabled)
1889 * - encoding: Set by user.
1890 * - decoding: unused
1895 * darkness masking (0-> disabled)
1896 * - encoding: Set by user.
1897 * - decoding: unused
1903 * - encoding: Set by libavcodec.
1904 * - decoding: Set by user (or 0).
1908 * prediction method (needed for huffyuv)
1909 * - encoding: Set by user.
1910 * - decoding: unused
1912 int prediction_method;
1913 #define FF_PRED_LEFT 0
1914 #define FF_PRED_PLANE 1
1915 #define FF_PRED_MEDIAN 2
1918 * slice offsets in the frame in bytes
1919 * - encoding: Set/allocated by libavcodec.
1920 * - decoding: Set/allocated by user (or NULL).
1925 * sample aspect ratio (0 if unknown)
1926 * That is the width of a pixel divided by the height of the pixel.
1927 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1928 * - encoding: Set by user.
1929 * - decoding: Set by libavcodec.
1931 AVRational sample_aspect_ratio;
1934 * motion estimation comparison function
1935 * - encoding: Set by user.
1936 * - decoding: unused
1940 * subpixel motion estimation comparison function
1941 * - encoding: Set by user.
1942 * - decoding: unused
1946 * macroblock comparison function (not supported yet)
1947 * - encoding: Set by user.
1948 * - decoding: unused
1952 * interlaced DCT comparison function
1953 * - encoding: Set by user.
1954 * - decoding: unused
1957 #define FF_CMP_SAD 0
1958 #define FF_CMP_SSE 1
1959 #define FF_CMP_SATD 2
1960 #define FF_CMP_DCT 3
1961 #define FF_CMP_PSNR 4
1962 #define FF_CMP_BIT 5
1964 #define FF_CMP_ZERO 7
1965 #define FF_CMP_VSAD 8
1966 #define FF_CMP_VSSE 9
1967 #define FF_CMP_NSSE 10
1968 #define FF_CMP_W53 11
1969 #define FF_CMP_W97 12
1970 #define FF_CMP_DCTMAX 13
1971 #define FF_CMP_DCT264 14
1972 #define FF_CMP_CHROMA 256
1975 * ME diamond size & shape
1976 * - encoding: Set by user.
1977 * - decoding: unused
1982 * amount of previous MV predictors (2a+1 x 2a+1 square)
1983 * - encoding: Set by user.
1984 * - decoding: unused
1986 int last_predictor_count;
1989 * prepass for motion estimation
1990 * - encoding: Set by user.
1991 * - decoding: unused
1996 * motion estimation prepass comparison function
1997 * - encoding: Set by user.
1998 * - decoding: unused
2003 * ME prepass diamond size & shape
2004 * - encoding: Set by user.
2005 * - decoding: unused
2011 * - encoding: Set by user.
2012 * - decoding: unused
2014 int me_subpel_quality;
2018 * DTG active format information (additional aspect ratio
2019 * information only used in DVB MPEG-2 transport streams)
2022 * - encoding: unused
2023 * - decoding: Set by decoder.
2024 * @deprecated Deprecated in favor of AVSideData
2026 attribute_deprecated int dtg_active_format;
2027 #define FF_DTG_AFD_SAME 8
2028 #define FF_DTG_AFD_4_3 9
2029 #define FF_DTG_AFD_16_9 10
2030 #define FF_DTG_AFD_14_9 11
2031 #define FF_DTG_AFD_4_3_SP_14_9 13
2032 #define FF_DTG_AFD_16_9_SP_14_9 14
2033 #define FF_DTG_AFD_SP_4_3 15
2034 #endif /* FF_API_AFD */
2037 * maximum motion estimation search range in subpel units
2038 * If 0 then no limit.
2040 * - encoding: Set by user.
2041 * - decoding: unused
2045 #if FF_API_QUANT_BIAS
2047 * @deprecated use encoder private option instead
2049 attribute_deprecated int intra_quant_bias;
2050 #define FF_DEFAULT_QUANT_BIAS 999999
2053 * @deprecated use encoder private option instead
2055 attribute_deprecated int inter_quant_bias;
2060 * - encoding: unused
2061 * - decoding: Set by user.
2064 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2065 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2066 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2070 * XVideo Motion Acceleration
2071 * - encoding: forbidden
2072 * - decoding: set by decoder
2073 * @deprecated XvMC doesn't need it anymore.
2075 attribute_deprecated int xvmc_acceleration;
2076 #endif /* FF_API_XVMC */
2079 * macroblock decision mode
2080 * - encoding: Set by user.
2081 * - decoding: unused
2084 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2085 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2086 #define FF_MB_DECISION_RD 2 ///< rate distortion
2089 * custom intra quantization matrix
2090 * - encoding: Set by user, can be NULL.
2091 * - decoding: Set by libavcodec.
2093 uint16_t *intra_matrix;
2096 * custom inter quantization matrix
2097 * - encoding: Set by user, can be NULL.
2098 * - decoding: Set by libavcodec.
2100 uint16_t *inter_matrix;
2103 * scene change detection threshold
2104 * 0 is default, larger means fewer detected scene changes.
2105 * - encoding: Set by user.
2106 * - decoding: unused
2108 int scenechange_threshold;
2111 * noise reduction strength
2112 * - encoding: Set by user.
2113 * - decoding: unused
2115 int noise_reduction;
2119 * @deprecated this field is unused
2121 attribute_deprecated
2125 * @deprecated this field is unused
2127 attribute_deprecated
2132 * precision of the intra DC coefficient - 8
2133 * - encoding: Set by user.
2134 * - decoding: Set by libavcodec
2136 int intra_dc_precision;
2139 * Number of macroblock rows at the top which are skipped.
2140 * - encoding: unused
2141 * - decoding: Set by user.
2146 * Number of macroblock rows at the bottom which are skipped.
2147 * - encoding: unused
2148 * - decoding: Set by user.
2154 * @deprecated use encoder private options instead
2156 attribute_deprecated
2157 float border_masking;
2161 * minimum MB lagrange multipler
2162 * - encoding: Set by user.
2163 * - decoding: unused
2168 * maximum MB lagrange multipler
2169 * - encoding: Set by user.
2170 * - decoding: unused
2176 * - encoding: Set by user.
2177 * - decoding: unused
2179 int me_penalty_compensation;
2183 * - encoding: Set by user.
2184 * - decoding: unused
2190 * - encoding: Set by user.
2191 * - decoding: unused
2197 * - encoding: Set by user.
2198 * - decoding: unused
2203 * number of reference frames
2204 * - encoding: Set by user.
2205 * - decoding: Set by lavc.
2210 * chroma qp offset from luma
2211 * - encoding: Set by user.
2212 * - decoding: unused
2216 #if FF_API_UNUSED_MEMBERS
2218 * Multiplied by qscale for each frame and added to scene_change_score.
2219 * - encoding: Set by user.
2220 * - decoding: unused
2222 attribute_deprecated int scenechange_factor;
2227 * Note: Value depends upon the compare function used for fullpel ME.
2228 * - encoding: Set by user.
2229 * - decoding: unused
2234 * Adjust sensitivity of b_frame_strategy 1.
2235 * - encoding: Set by user.
2236 * - decoding: unused
2241 * Chromaticity coordinates of the source primaries.
2242 * - encoding: Set by user
2243 * - decoding: Set by libavcodec
2245 enum AVColorPrimaries color_primaries;
2248 * Color Transfer Characteristic.
2249 * - encoding: Set by user
2250 * - decoding: Set by libavcodec
2252 enum AVColorTransferCharacteristic color_trc;
2255 * YUV colorspace type.
2256 * - encoding: Set by user
2257 * - decoding: Set by libavcodec
2259 enum AVColorSpace colorspace;
2262 * MPEG vs JPEG YUV range.
2263 * - encoding: Set by user
2264 * - decoding: Set by libavcodec
2266 enum AVColorRange color_range;
2269 * This defines the location of chroma samples.
2270 * - encoding: Set by user
2271 * - decoding: Set by libavcodec
2273 enum AVChromaLocation chroma_sample_location;
2277 * Indicates number of picture subdivisions. Used for parallelized
2279 * - encoding: Set by user
2280 * - decoding: unused
2285 * - encoding: set by libavcodec
2286 * - decoding: Set by user.
2288 enum AVFieldOrder field_order;
2291 int sample_rate; ///< samples per second
2292 int channels; ///< number of audio channels
2295 * audio sample format
2296 * - encoding: Set by user.
2297 * - decoding: Set by libavcodec.
2299 enum AVSampleFormat sample_fmt; ///< sample format
2301 /* The following data should not be initialized. */
2303 * Number of samples per channel in an audio frame.
2305 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2306 * except the last must contain exactly frame_size samples per channel.
2307 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2308 * frame size is not restricted.
2309 * - decoding: may be set by some decoders to indicate constant frame size
2314 * Frame counter, set by libavcodec.
2316 * - decoding: total number of frames returned from the decoder so far.
2317 * - encoding: total number of frames passed to the encoder so far.
2319 * @note the counter is not incremented if encoding/decoding resulted in
2325 * number of bytes per packet if constant and known or 0
2326 * Used by some WAV based audio codecs.
2331 * Audio cutoff bandwidth (0 means "automatic")
2332 * - encoding: Set by user.
2333 * - decoding: unused
2338 * Audio channel layout.
2339 * - encoding: set by user.
2340 * - decoding: set by user, may be overwritten by libavcodec.
2342 uint64_t channel_layout;
2345 * Request decoder to use this channel layout if it can (0 for default)
2346 * - encoding: unused
2347 * - decoding: Set by user.
2349 uint64_t request_channel_layout;
2352 * Type of service that the audio stream conveys.
2353 * - encoding: Set by user.
2354 * - decoding: Set by libavcodec.
2356 enum AVAudioServiceType audio_service_type;
2359 * desired sample format
2360 * - encoding: Not used.
2361 * - decoding: Set by user.
2362 * Decoder will decode to this format if it can.
2364 enum AVSampleFormat request_sample_fmt;
2367 * This callback is called at the beginning of each frame to get data
2368 * buffer(s) for it. There may be one contiguous buffer for all the data or
2369 * there may be a buffer per each data plane or anything in between. What
2370 * this means is, you may set however many entries in buf[] you feel necessary.
2371 * Each buffer must be reference-counted using the AVBuffer API (see description
2374 * The following fields will be set in the frame before this callback is
2377 * - width, height (video only)
2378 * - sample_rate, channel_layout, nb_samples (audio only)
2379 * Their values may differ from the corresponding values in
2380 * AVCodecContext. This callback must use the frame values, not the codec
2381 * context values, to calculate the required buffer size.
2383 * This callback must fill the following fields in the frame:
2387 * * if the data is planar audio with more than 8 channels, then this
2388 * callback must allocate and fill extended_data to contain all pointers
2389 * to all data planes. data[] must hold as many pointers as it can.
2390 * extended_data must be allocated with av_malloc() and will be freed in
2392 * * otherwise exended_data must point to data
2393 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2394 * the frame's data and extended_data pointers must be contained in these. That
2395 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2396 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2397 * and av_buffer_ref().
2398 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2399 * this callback and filled with the extra buffers if there are more
2400 * buffers than buf[] can hold. extended_buf will be freed in
2403 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2404 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2407 * Each data plane must be aligned to the maximum required by the target
2410 * @see avcodec_default_get_buffer2()
2414 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2415 * (read and/or written to if it is writable) later by libavcodec.
2417 * avcodec_align_dimensions2() should be used to find the required width and
2418 * height, as they normally need to be rounded up to the next multiple of 16.
2420 * Some decoders do not support linesizes changing between frames.
2422 * If frame multithreading is used and thread_safe_callbacks is set,
2423 * this callback may be called from a different thread, but not from more
2424 * than one at once. Does not need to be reentrant.
2426 * @see avcodec_align_dimensions2()
2430 * Decoders request a buffer of a particular size by setting
2431 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2432 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2433 * to a smaller value in the output frame.
2435 * As a convenience, av_samples_get_buffer_size() and
2436 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2437 * functions to find the required data size and to fill data pointers and
2438 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2439 * since all planes must be the same size.
2441 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2443 * - encoding: unused
2444 * - decoding: Set by libavcodec, user can override.
2446 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2449 * If non-zero, the decoded audio and video frames returned from
2450 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2451 * and are valid indefinitely. The caller must free them with
2452 * av_frame_unref() when they are not needed anymore.
2453 * Otherwise, the decoded frames must not be freed by the caller and are
2454 * only valid until the next decode call.
2456 * - encoding: unused
2457 * - decoding: set by the caller before avcodec_open2().
2459 int refcounted_frames;
2461 /* - encoding parameters */
2462 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2463 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2467 * - encoding: Set by user.
2468 * - decoding: unused
2474 * - encoding: Set by user.
2475 * - decoding: unused
2480 * maximum quantizer difference between frames
2481 * - encoding: Set by user.
2482 * - decoding: unused
2488 * @deprecated use encoder private options instead
2490 attribute_deprecated
2493 attribute_deprecated
2495 attribute_deprecated
2500 * decoder bitstream buffer size
2501 * - encoding: Set by user.
2502 * - decoding: unused
2507 * ratecontrol override, see RcOverride
2508 * - encoding: Allocated/set/freed by user.
2509 * - decoding: unused
2511 int rc_override_count;
2512 RcOverride *rc_override;
2516 * @deprecated use encoder private options instead
2518 attribute_deprecated
2524 * - encoding: Set by user.
2525 * - decoding: Set by user, may be overwritten by libavcodec.
2527 int64_t rc_max_rate;
2531 * - encoding: Set by user.
2532 * - decoding: unused
2534 int64_t rc_min_rate;
2538 * @deprecated use encoder private options instead
2540 attribute_deprecated
2541 float rc_buffer_aggressivity;
2543 attribute_deprecated
2544 float rc_initial_cplx;
2548 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2549 * - encoding: Set by user.
2550 * - decoding: unused.
2552 float rc_max_available_vbv_use;
2555 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2556 * - encoding: Set by user.
2557 * - decoding: unused.
2559 float rc_min_vbv_overflow_use;
2562 * Number of bits which should be loaded into the rc buffer before decoding starts.
2563 * - encoding: Set by user.
2564 * - decoding: unused
2566 int rc_initial_buffer_occupancy;
2568 #if FF_API_CODER_TYPE
2569 #define FF_CODER_TYPE_VLC 0
2570 #define FF_CODER_TYPE_AC 1
2571 #define FF_CODER_TYPE_RAW 2
2572 #define FF_CODER_TYPE_RLE 3
2573 #if FF_API_UNUSED_MEMBERS
2574 #define FF_CODER_TYPE_DEFLATE 4
2575 #endif /* FF_API_UNUSED_MEMBERS */
2577 * @deprecated use encoder private options instead
2579 attribute_deprecated
2581 #endif /* FF_API_CODER_TYPE */
2585 * - encoding: Set by user.
2586 * - decoding: unused
2592 * @deprecated use encoder private options instead
2594 attribute_deprecated
2598 * @deprecated use encoder private options instead
2600 attribute_deprecated
2605 * frame skip threshold
2606 * - encoding: Set by user.
2607 * - decoding: unused
2609 int frame_skip_threshold;
2613 * - encoding: Set by user.
2614 * - decoding: unused
2616 int frame_skip_factor;
2619 * frame skip exponent
2620 * - encoding: Set by user.
2621 * - decoding: unused
2626 * frame skip comparison function
2627 * - encoding: Set by user.
2628 * - decoding: unused
2633 * trellis RD quantization
2634 * - encoding: Set by user.
2635 * - decoding: unused
2640 * - encoding: Set by user.
2641 * - decoding: unused
2643 int min_prediction_order;
2646 * - encoding: Set by user.
2647 * - decoding: unused
2649 int max_prediction_order;
2652 * GOP timecode frame start number
2653 * - encoding: Set by user, in non drop frame format
2654 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2656 int64_t timecode_frame_start;
2658 #if FF_API_RTP_CALLBACK
2660 * @deprecated unused
2662 /* The RTP callback: This function is called */
2663 /* every time the encoder has a packet to send. */
2664 /* It depends on the encoder if the data starts */
2665 /* with a Start Code (it should). H.263 does. */
2666 /* mb_nb contains the number of macroblocks */
2667 /* encoded in the RTP payload. */
2668 attribute_deprecated
2669 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2672 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2673 /* do its best to deliver a chunk with size */
2674 /* below rtp_payload_size, the chunk will start */
2675 /* with a start code on some codecs like H.263. */
2676 /* This doesn't take account of any particular */
2677 /* headers inside the transmitted RTP payload. */
2679 #if FF_API_STAT_BITS
2680 /* statistics, used for 2-pass encoding */
2681 attribute_deprecated
2683 attribute_deprecated
2685 attribute_deprecated
2687 attribute_deprecated
2689 attribute_deprecated
2691 attribute_deprecated
2693 attribute_deprecated
2695 attribute_deprecated
2698 /** @deprecated this field is unused */
2699 attribute_deprecated
2704 * pass1 encoding statistics output buffer
2705 * - encoding: Set by libavcodec.
2706 * - decoding: unused
2711 * pass2 encoding statistics input buffer
2712 * Concatenated stuff from stats_out of pass1 should be placed here.
2713 * - encoding: Allocated/set/freed by user.
2714 * - decoding: unused
2719 * Work around bugs in encoders which sometimes cannot be detected automatically.
2720 * - encoding: Set by user
2721 * - decoding: Set by user
2723 int workaround_bugs;
2724 #define FF_BUG_AUTODETECT 1 ///< autodetection
2725 #if FF_API_OLD_MSMPEG4
2726 #define FF_BUG_OLD_MSMPEG4 2
2728 #define FF_BUG_XVID_ILACE 4
2729 #define FF_BUG_UMP4 8
2730 #define FF_BUG_NO_PADDING 16
2731 #define FF_BUG_AMV 32
2733 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2735 #define FF_BUG_QPEL_CHROMA 64
2736 #define FF_BUG_STD_QPEL 128
2737 #define FF_BUG_QPEL_CHROMA2 256
2738 #define FF_BUG_DIRECT_BLOCKSIZE 512
2739 #define FF_BUG_EDGE 1024
2740 #define FF_BUG_HPEL_CHROMA 2048
2741 #define FF_BUG_DC_CLIP 4096
2742 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2743 #define FF_BUG_TRUNCATED 16384
2746 * strictly follow the standard (MPEG4, ...).
2747 * - encoding: Set by user.
2748 * - decoding: Set by user.
2749 * Setting this to STRICT or higher means the encoder and decoder will
2750 * generally do stupid things, whereas setting it to unofficial or lower
2751 * will mean the encoder might produce output that is not supported by all
2752 * spec-compliant decoders. Decoders don't differentiate between normal,
2753 * unofficial and experimental (that is, they always try to decode things
2754 * when they can) unless they are explicitly asked to behave stupidly
2755 * (=strictly conform to the specs)
2757 int strict_std_compliance;
2758 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2759 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2760 #define FF_COMPLIANCE_NORMAL 0
2761 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2762 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2765 * error concealment flags
2766 * - encoding: unused
2767 * - decoding: Set by user.
2769 int error_concealment;
2770 #define FF_EC_GUESS_MVS 1
2771 #define FF_EC_DEBLOCK 2
2772 #define FF_EC_FAVOR_INTER 256
2776 * - encoding: Set by user.
2777 * - decoding: Set by user.
2780 #define FF_DEBUG_PICT_INFO 1
2781 #define FF_DEBUG_RC 2
2782 #define FF_DEBUG_BITSTREAM 4
2783 #define FF_DEBUG_MB_TYPE 8
2784 #define FF_DEBUG_QP 16
2787 * @deprecated this option does nothing
2789 #define FF_DEBUG_MV 32
2791 #define FF_DEBUG_DCT_COEFF 0x00000040
2792 #define FF_DEBUG_SKIP 0x00000080
2793 #define FF_DEBUG_STARTCODE 0x00000100
2794 #if FF_API_UNUSED_MEMBERS
2795 #define FF_DEBUG_PTS 0x00000200
2796 #endif /* FF_API_UNUSED_MEMBERS */
2797 #define FF_DEBUG_ER 0x00000400
2798 #define FF_DEBUG_MMCO 0x00000800
2799 #define FF_DEBUG_BUGS 0x00001000
2801 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2802 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2804 #define FF_DEBUG_BUFFERS 0x00008000
2805 #define FF_DEBUG_THREADS 0x00010000
2806 #define FF_DEBUG_GREEN_MD 0x00800000
2807 #define FF_DEBUG_NOMC 0x01000000
2812 * Code outside libavcodec should access this field using AVOptions
2813 * - encoding: Set by user.
2814 * - decoding: Set by user.
2817 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2818 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2819 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2823 * Error recognition; may misdetect some more or less valid parts as errors.
2824 * - encoding: unused
2825 * - decoding: Set by user.
2827 int err_recognition;
2830 * Verify checksums embedded in the bitstream (could be of either encoded or
2831 * decoded data, depending on the codec) and print an error message on mismatch.
2832 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2833 * decoder returning an error.
2835 #define AV_EF_CRCCHECK (1<<0)
2836 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2837 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2838 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2840 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2841 #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
2842 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2843 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2847 * opaque 64bit number (generally a PTS) that will be reordered and
2848 * output in AVFrame.reordered_opaque
2849 * - encoding: unused
2850 * - decoding: Set by user.
2852 int64_t reordered_opaque;
2855 * Hardware accelerator in use
2856 * - encoding: unused.
2857 * - decoding: Set by libavcodec
2859 struct AVHWAccel *hwaccel;
2862 * Hardware accelerator context.
2863 * For some hardware accelerators, a global context needs to be
2864 * provided by the user. In that case, this holds display-dependent
2865 * data FFmpeg cannot instantiate itself. Please refer to the
2866 * FFmpeg HW accelerator documentation to know how to fill this
2867 * is. e.g. for VA API, this is a struct vaapi_context.
2868 * - encoding: unused
2869 * - decoding: Set by user
2871 void *hwaccel_context;
2875 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2876 * - decoding: unused
2878 uint64_t error[AV_NUM_DATA_POINTERS];
2881 * DCT algorithm, see FF_DCT_* below
2882 * - encoding: Set by user.
2883 * - decoding: unused
2886 #define FF_DCT_AUTO 0
2887 #define FF_DCT_FASTINT 1
2888 #define FF_DCT_INT 2
2889 #define FF_DCT_MMX 3
2890 #define FF_DCT_ALTIVEC 5
2891 #define FF_DCT_FAAN 6
2894 * IDCT algorithm, see FF_IDCT_* below.
2895 * - encoding: Set by user.
2896 * - decoding: Set by user.
2899 #define FF_IDCT_AUTO 0
2900 #define FF_IDCT_INT 1
2901 #define FF_IDCT_SIMPLE 2
2902 #define FF_IDCT_SIMPLEMMX 3
2903 #define FF_IDCT_ARM 7
2904 #define FF_IDCT_ALTIVEC 8
2906 #define FF_IDCT_SH4 9
2908 #define FF_IDCT_SIMPLEARM 10
2909 #if FF_API_UNUSED_MEMBERS
2910 #define FF_IDCT_IPP 13
2911 #endif /* FF_API_UNUSED_MEMBERS */
2912 #define FF_IDCT_XVID 14
2913 #if FF_API_IDCT_XVIDMMX
2914 #define FF_IDCT_XVIDMMX 14
2915 #endif /* FF_API_IDCT_XVIDMMX */
2916 #define FF_IDCT_SIMPLEARMV5TE 16
2917 #define FF_IDCT_SIMPLEARMV6 17
2918 #if FF_API_ARCH_SPARC
2919 #define FF_IDCT_SIMPLEVIS 18
2921 #define FF_IDCT_FAAN 20
2922 #define FF_IDCT_SIMPLENEON 22
2923 #if FF_API_ARCH_ALPHA
2924 #define FF_IDCT_SIMPLEALPHA 23
2926 #define FF_IDCT_SIMPLEAUTO 128
2929 * bits per sample/pixel from the demuxer (needed for huffyuv).
2930 * - encoding: Set by libavcodec.
2931 * - decoding: Set by user.
2933 int bits_per_coded_sample;
2936 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2937 * - encoding: set by user.
2938 * - decoding: set by libavcodec.
2940 int bits_per_raw_sample;
2944 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2945 * - encoding: unused
2946 * - decoding: Set by user.
2947 * Code outside libavcodec should access this field using:
2948 * av_codec_{get,set}_lowres(avctx)
2953 #if FF_API_CODED_FRAME
2955 * the picture in the bitstream
2956 * - encoding: Set by libavcodec.
2957 * - decoding: unused
2959 * @deprecated use the quality factor packet side data instead
2961 attribute_deprecated AVFrame *coded_frame;
2966 * is used to decide how many independent tasks should be passed to execute()
2967 * - encoding: Set by user.
2968 * - decoding: Set by user.
2973 * Which multithreading methods to use.
2974 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2975 * so clients which cannot provide future frames should not use it.
2977 * - encoding: Set by user, otherwise the default is used.
2978 * - decoding: Set by user, otherwise the default is used.
2981 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2982 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2985 * Which multithreading methods are in use by the codec.
2986 * - encoding: Set by libavcodec.
2987 * - decoding: Set by libavcodec.
2989 int active_thread_type;
2992 * Set by the client if its custom get_buffer() callback can be called
2993 * synchronously from another thread, which allows faster multithreaded decoding.
2994 * draw_horiz_band() will be called from other threads regardless of this setting.
2995 * Ignored if the default get_buffer() is used.
2996 * - encoding: Set by user.
2997 * - decoding: Set by user.
2999 int thread_safe_callbacks;
3002 * The codec may call this to execute several independent things.
3003 * It will return only after finishing all tasks.
3004 * The user may replace this with some multithreaded implementation,
3005 * the default implementation will execute the parts serially.
3006 * @param count the number of things to execute
3007 * - encoding: Set by libavcodec, user can override.
3008 * - decoding: Set by libavcodec, user can override.
3010 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3013 * The codec may call this to execute several independent things.
3014 * It will return only after finishing all tasks.
3015 * The user may replace this with some multithreaded implementation,
3016 * the default implementation will execute the parts serially.
3017 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3018 * @param c context passed also to func
3019 * @param count the number of things to execute
3020 * @param arg2 argument passed unchanged to func
3021 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3022 * @param func function that will be called count times, with jobnr from 0 to count-1.
3023 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3024 * two instances of func executing at the same time will have the same threadnr.
3025 * @return always 0 currently, but code should handle a future improvement where when any call to func
3026 * returns < 0 no further calls to func may be done and < 0 is returned.
3027 * - encoding: Set by libavcodec, user can override.
3028 * - decoding: Set by libavcodec, user can override.
3030 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3033 * noise vs. sse weight for the nsse comparison function
3034 * - encoding: Set by user.
3035 * - decoding: unused
3041 * - encoding: Set by user.
3042 * - decoding: Set by libavcodec.
3045 #define FF_PROFILE_UNKNOWN -99
3046 #define FF_PROFILE_RESERVED -100
3048 #define FF_PROFILE_AAC_MAIN 0
3049 #define FF_PROFILE_AAC_LOW 1
3050 #define FF_PROFILE_AAC_SSR 2
3051 #define FF_PROFILE_AAC_LTP 3
3052 #define FF_PROFILE_AAC_HE 4
3053 #define FF_PROFILE_AAC_HE_V2 28
3054 #define FF_PROFILE_AAC_LD 22
3055 #define FF_PROFILE_AAC_ELD 38
3056 #define FF_PROFILE_MPEG2_AAC_LOW 128
3057 #define FF_PROFILE_MPEG2_AAC_HE 131
3059 #define FF_PROFILE_DTS 20
3060 #define FF_PROFILE_DTS_ES 30
3061 #define FF_PROFILE_DTS_96_24 40
3062 #define FF_PROFILE_DTS_HD_HRA 50
3063 #define FF_PROFILE_DTS_HD_MA 60
3064 #define FF_PROFILE_DTS_EXPRESS 70
3066 #define FF_PROFILE_MPEG2_422 0
3067 #define FF_PROFILE_MPEG2_HIGH 1
3068 #define FF_PROFILE_MPEG2_SS 2
3069 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3070 #define FF_PROFILE_MPEG2_MAIN 4
3071 #define FF_PROFILE_MPEG2_SIMPLE 5
3073 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3074 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3076 #define FF_PROFILE_H264_BASELINE 66
3077 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3078 #define FF_PROFILE_H264_MAIN 77
3079 #define FF_PROFILE_H264_EXTENDED 88
3080 #define FF_PROFILE_H264_HIGH 100
3081 #define FF_PROFILE_H264_HIGH_10 110
3082 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3083 #define FF_PROFILE_H264_HIGH_422 122
3084 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3085 #define FF_PROFILE_H264_HIGH_444 144
3086 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3087 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3088 #define FF_PROFILE_H264_CAVLC_444 44
3090 #define FF_PROFILE_VC1_SIMPLE 0
3091 #define FF_PROFILE_VC1_MAIN 1
3092 #define FF_PROFILE_VC1_COMPLEX 2
3093 #define FF_PROFILE_VC1_ADVANCED 3
3095 #define FF_PROFILE_MPEG4_SIMPLE 0
3096 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3097 #define FF_PROFILE_MPEG4_CORE 2
3098 #define FF_PROFILE_MPEG4_MAIN 3
3099 #define FF_PROFILE_MPEG4_N_BIT 4
3100 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3101 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3102 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3103 #define FF_PROFILE_MPEG4_HYBRID 8
3104 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3105 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3106 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3107 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3108 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3109 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3110 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3112 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3113 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3114 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3115 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3116 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3118 #define FF_PROFILE_VP9_0 0
3119 #define FF_PROFILE_VP9_1 1
3120 #define FF_PROFILE_VP9_2 2
3121 #define FF_PROFILE_VP9_3 3
3123 #define FF_PROFILE_HEVC_MAIN 1
3124 #define FF_PROFILE_HEVC_MAIN_10 2
3125 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3126 #define FF_PROFILE_HEVC_REXT 4
3130 * - encoding: Set by user.
3131 * - decoding: Set by libavcodec.
3134 #define FF_LEVEL_UNKNOWN -99
3137 * Skip loop filtering for selected frames.
3138 * - encoding: unused
3139 * - decoding: Set by user.
3141 enum AVDiscard skip_loop_filter;
3144 * Skip IDCT/dequantization for selected frames.
3145 * - encoding: unused
3146 * - decoding: Set by user.
3148 enum AVDiscard skip_idct;
3151 * Skip decoding for selected frames.
3152 * - encoding: unused
3153 * - decoding: Set by user.
3155 enum AVDiscard skip_frame;
3158 * Header containing style information for text subtitles.
3159 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3160 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3161 * the Format line following. It shouldn't include any Dialogue line.
3162 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3163 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3165 uint8_t *subtitle_header;
3166 int subtitle_header_size;
3168 #if FF_API_ERROR_RATE
3170 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3173 attribute_deprecated
3177 #if FF_API_VBV_DELAY
3179 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3180 * Used for compliant TS muxing.
3181 * - encoding: Set by libavcodec.
3182 * - decoding: unused.
3183 * @deprecated this value is now exported as a part of
3184 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3186 attribute_deprecated
3190 #if FF_API_SIDEDATA_ONLY_PKT
3192 * Encoding only and set by default. Allow encoders to output packets
3193 * that do not contain any encoded data, only side data.
3195 * Some encoders need to output such packets, e.g. to update some stream
3196 * parameters at the end of encoding.
3198 * @deprecated this field disables the default behaviour and
3199 * it is kept only for compatibility.
3201 attribute_deprecated
3202 int side_data_only_packets;
3206 * Audio only. The number of "priming" samples (padding) inserted by the
3207 * encoder at the beginning of the audio. I.e. this number of leading
3208 * decoded samples must be discarded by the caller to get the original audio
3209 * without leading padding.
3211 * - decoding: unused
3212 * - encoding: Set by libavcodec. The timestamps on the output packets are
3213 * adjusted by the encoder so that they always refer to the
3214 * first sample of the data actually contained in the packet,
3215 * including any added padding. E.g. if the timebase is
3216 * 1/samplerate and the timestamp of the first input sample is
3217 * 0, the timestamp of the first output packet will be
3220 int initial_padding;
3223 * - decoding: For codecs that store a framerate value in the compressed
3224 * bitstream, the decoder may export it here. { 0, 1} when
3226 * - encoding: unused
3228 AVRational framerate;
3231 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3232 * - encoding: unused.
3233 * - decoding: Set by libavcodec before calling get_format()
3235 enum AVPixelFormat sw_pix_fmt;
3238 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3239 * Code outside libavcodec should access this field using:
3240 * av_codec_{get,set}_pkt_timebase(avctx)
3241 * - encoding unused.
3242 * - decoding set by user.
3244 AVRational pkt_timebase;
3248 * Code outside libavcodec should access this field using:
3249 * av_codec_{get,set}_codec_descriptor(avctx)
3250 * - encoding: unused.
3251 * - decoding: set by libavcodec.
3253 const AVCodecDescriptor *codec_descriptor;
3257 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3258 * - encoding: unused
3259 * - decoding: Set by user.
3260 * Code outside libavcodec should access this field using:
3261 * av_codec_{get,set}_lowres(avctx)
3267 * Current statistics for PTS correction.
3268 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3269 * - encoding: unused
3271 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3272 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3273 int64_t pts_correction_last_pts; /// PTS of the last frame
3274 int64_t pts_correction_last_dts; /// DTS of the last frame
3277 * Character encoding of the input subtitles file.
3278 * - decoding: set by user
3279 * - encoding: unused
3284 * Subtitles character encoding mode. Formats or codecs might be adjusting
3285 * this setting (if they are doing the conversion themselves for instance).
3286 * - decoding: set by libavcodec
3287 * - encoding: unused
3289 int sub_charenc_mode;
3290 #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)
3291 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3292 #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
3295 * Skip processing alpha if supported by codec.
3296 * Note that if the format uses pre-multiplied alpha (common with VP6,
3297 * and recommended due to better video quality/compression)
3298 * the image will look as if alpha-blended onto a black background.
3299 * However for formats that do not use pre-multiplied alpha
3300 * there might be serious artefacts (though e.g. libswscale currently
3301 * assumes pre-multiplied alpha anyway).
3302 * Code outside libavcodec should access this field using AVOptions
3304 * - decoding: set by user
3305 * - encoding: unused
3310 * Number of samples to skip after a discontinuity
3311 * - decoding: unused
3312 * - encoding: set by libavcodec
3316 #if !FF_API_DEBUG_MV
3318 * debug motion vectors
3319 * Code outside libavcodec should access this field using AVOptions
3320 * - encoding: Set by user.
3321 * - decoding: Set by user.
3324 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3325 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3326 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3330 * custom intra quantization matrix
3331 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3332 * - encoding: Set by user, can be NULL.
3333 * - decoding: unused.
3335 uint16_t *chroma_intra_matrix;
3338 * dump format separator.
3339 * can be ", " or "\n " or anything else
3340 * Code outside libavcodec should access this field using AVOptions
3341 * (NO direct access).
3342 * - encoding: Set by user.
3343 * - decoding: Set by user.
3345 uint8_t *dump_separator;
3348 * ',' separated list of allowed decoders.
3349 * If NULL then all are allowed
3350 * - encoding: unused
3351 * - decoding: set by user through AVOPtions (NO direct access)
3353 char *codec_whitelist;
3356 * Properties of the stream that gets decoded
3357 * To be accessed through av_codec_get_properties() (NO direct access)
3358 * - encoding: unused
3359 * - decoding: set by libavcodec
3361 unsigned properties;
3362 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3363 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3366 * Additional data associated with the entire coded stream.
3368 * - decoding: unused
3369 * - encoding: may be set by libavcodec after avcodec_open2().
3371 AVPacketSideData *coded_side_data;
3372 int nb_coded_side_data;
3376 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3377 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3379 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3380 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3382 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3384 int av_codec_get_lowres(const AVCodecContext *avctx);
3385 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3387 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3388 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3390 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3391 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3396 typedef struct AVProfile {
3398 const char *name; ///< short name for the profile
3401 typedef struct AVCodecDefault AVCodecDefault;
3408 typedef struct AVCodec {
3410 * Name of the codec implementation.
3411 * The name is globally unique among encoders and among decoders (but an
3412 * encoder and a decoder can share the same name).
3413 * This is the primary way to find a codec from the user perspective.
3417 * Descriptive name for the codec, meant to be more human readable than name.
3418 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3420 const char *long_name;
3421 enum AVMediaType type;
3424 * Codec capabilities.
3425 * see AV_CODEC_CAP_*
3428 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3429 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3430 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3431 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3432 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3433 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3434 const AVClass *priv_class; ///< AVClass for the private context
3435 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3437 /*****************************************************************
3438 * No fields below this line are part of the public API. They
3439 * may not be used outside of libavcodec and can be changed and
3441 * New public fields should be added right above.
3442 *****************************************************************
3445 struct AVCodec *next;
3447 * @name Frame-level threading support functions
3451 * If defined, called on thread contexts when they are created.
3452 * If the codec allocates writable tables in init(), re-allocate them here.
3453 * priv_data will be set to a copy of the original.
3455 int (*init_thread_copy)(AVCodecContext *);
3457 * Copy necessary context variables from a previous thread context to the current one.
3458 * If not defined, the next thread will start automatically; otherwise, the codec
3459 * must call ff_thread_finish_setup().
3461 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3463 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3467 * Private codec-specific defaults.
3469 const AVCodecDefault *defaults;
3472 * Initialize codec static data, called from avcodec_register().
3474 void (*init_static_data)(struct AVCodec *codec);
3476 int (*init)(AVCodecContext *);
3477 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3478 const struct AVSubtitle *sub);
3480 * Encode data to an AVPacket.
3482 * @param avctx codec context
3483 * @param avpkt output AVPacket (may contain a user-provided buffer)
3484 * @param[in] frame AVFrame containing the raw data to be encoded
3485 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3486 * non-empty packet was returned in avpkt.
3487 * @return 0 on success, negative error code on failure
3489 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3490 int *got_packet_ptr);
3491 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3492 int (*close)(AVCodecContext *);
3495 * Will be called when seeking
3497 void (*flush)(AVCodecContext *);
3499 * Internal codec capabilities.
3500 * See FF_CODEC_CAP_* in internal.h
3505 int av_codec_get_max_lowres(const AVCodec *codec);
3507 struct MpegEncContext;
3510 * @defgroup lavc_hwaccel AVHWAccel
3513 typedef struct AVHWAccel {
3515 * Name of the hardware accelerated codec.
3516 * The name is globally unique among encoders and among decoders (but an
3517 * encoder and a decoder can share the same name).
3522 * Type of codec implemented by the hardware accelerator.
3524 * See AVMEDIA_TYPE_xxx
3526 enum AVMediaType type;
3529 * Codec implemented by the hardware accelerator.
3531 * See AV_CODEC_ID_xxx
3536 * Supported pixel format.
3538 * Only hardware accelerated formats are supported here.
3540 enum AVPixelFormat pix_fmt;
3543 * Hardware accelerated codec capabilities.
3544 * see HWACCEL_CODEC_CAP_*
3548 /*****************************************************************
3549 * No fields below this line are part of the public API. They
3550 * may not be used outside of libavcodec and can be changed and
3552 * New public fields should be added right above.
3553 *****************************************************************
3555 struct AVHWAccel *next;
3558 * Allocate a custom buffer
3560 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3563 * Called at the beginning of each frame or field picture.
3565 * Meaningful frame information (codec specific) is guaranteed to
3566 * be parsed at this point. This function is mandatory.
3568 * Note that buf can be NULL along with buf_size set to 0.
3569 * Otherwise, this means the whole frame is available at this point.
3571 * @param avctx the codec context
3572 * @param buf the frame data buffer base
3573 * @param buf_size the size of the frame in bytes
3574 * @return zero if successful, a negative value otherwise
3576 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3579 * Callback for each slice.
3581 * Meaningful slice information (codec specific) is guaranteed to
3582 * be parsed at this point. This function is mandatory.
3583 * The only exception is XvMC, that works on MB level.
3585 * @param avctx the codec context
3586 * @param buf the slice data buffer base
3587 * @param buf_size the size of the slice in bytes
3588 * @return zero if successful, a negative value otherwise
3590 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3593 * Called at the end of each frame or field picture.
3595 * The whole picture is parsed at this point and can now be sent
3596 * to the hardware accelerator. This function is mandatory.
3598 * @param avctx the codec context
3599 * @return zero if successful, a negative value otherwise
3601 int (*end_frame)(AVCodecContext *avctx);
3604 * Size of per-frame hardware accelerator private data.
3606 * Private data is allocated with av_mallocz() before
3607 * AVCodecContext.get_buffer() and deallocated after
3608 * AVCodecContext.release_buffer().
3610 int frame_priv_data_size;
3613 * Called for every Macroblock in a slice.
3615 * XvMC uses it to replace the ff_mpv_decode_mb().
3616 * Instead of decoding to raw picture, MB parameters are
3617 * stored in an array provided by the video driver.
3619 * @param s the mpeg context
3621 void (*decode_mb)(struct MpegEncContext *s);
3624 * Initialize the hwaccel private data.
3626 * This will be called from ff_get_format(), after hwaccel and
3627 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3630 int (*init)(AVCodecContext *avctx);
3633 * Uninitialize the hwaccel private data.
3635 * This will be called from get_format() or avcodec_close(), after hwaccel
3636 * and hwaccel_context are already uninitialized.
3638 int (*uninit)(AVCodecContext *avctx);
3641 * Size of the private data to allocate in
3642 * AVCodecInternal.hwaccel_priv_data.
3648 * Hardware acceleration should be used for decoding even if the codec level
3649 * used is unknown or higher than the maximum supported level reported by the
3652 * It's generally a good idea to pass this flag unless you have a specific
3653 * reason not to, as hardware tends to under-report supported levels.
3655 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3658 * Hardware acceleration can output YUV pixel formats with a different chroma
3659 * sampling than 4:2:0 and/or other than 8 bits per component.
3661 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3667 #if FF_API_AVPICTURE
3669 * @defgroup lavc_picture AVPicture
3671 * Functions for working with AVPicture
3676 * Picture data structure.
3678 * Up to four components can be stored into it, the last component is
3680 * @deprecated use AVFrame or imgutils functions instead
3682 typedef struct AVPicture {
3683 attribute_deprecated
3684 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3685 attribute_deprecated
3686 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3694 enum AVSubtitleType {
3697 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3700 * Plain text, the text field must be set by the decoder and is
3701 * authoritative. ass and pict fields may contain approximations.
3706 * Formatted text, the ass field must be set by the decoder and is
3707 * authoritative. pict and text fields may contain approximations.
3712 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3714 typedef struct AVSubtitleRect {
3715 int x; ///< top left corner of pict, undefined when pict is not set
3716 int y; ///< top left corner of pict, undefined when pict is not set
3717 int w; ///< width of pict, undefined when pict is not set
3718 int h; ///< height of pict, undefined when pict is not set
3719 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3721 #if FF_API_AVPICTURE
3723 * @deprecated unused
3725 attribute_deprecated
3729 * data+linesize for the bitmap of this subtitle.
3730 * Can be set for text/ass as well once they are rendered.
3735 enum AVSubtitleType type;
3737 char *text; ///< 0 terminated plain UTF-8 text
3740 * 0 terminated ASS/SSA compatible event line.
3741 * The presentation of this is unaffected by the other values in this
3749 typedef struct AVSubtitle {
3750 uint16_t format; /* 0 = graphics */
3751 uint32_t start_display_time; /* relative to packet pts, in ms */
3752 uint32_t end_display_time; /* relative to packet pts, in ms */
3754 AVSubtitleRect **rects;
3755 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3759 * If c is NULL, returns the first registered codec,
3760 * if c is non-NULL, returns the next registered codec after c,
3761 * or NULL if c is the last one.
3763 AVCodec *av_codec_next(const AVCodec *c);
3766 * Return the LIBAVCODEC_VERSION_INT constant.
3768 unsigned avcodec_version(void);
3771 * Return the libavcodec build-time configuration.
3773 const char *avcodec_configuration(void);
3776 * Return the libavcodec license.
3778 const char *avcodec_license(void);
3781 * Register the codec codec and initialize libavcodec.
3783 * @warning either this function or avcodec_register_all() must be called
3784 * before any other libavcodec functions.
3786 * @see avcodec_register_all()
3788 void avcodec_register(AVCodec *codec);
3791 * Register all the codecs, parsers and bitstream filters which were enabled at
3792 * configuration time. If you do not call this function you can select exactly
3793 * which formats you want to support, by using the individual registration
3796 * @see avcodec_register
3797 * @see av_register_codec_parser
3798 * @see av_register_bitstream_filter
3800 void avcodec_register_all(void);
3803 * Allocate an AVCodecContext and set its fields to default values. The
3804 * resulting struct should be freed with avcodec_free_context().
3806 * @param codec if non-NULL, allocate private data and initialize defaults
3807 * for the given codec. It is illegal to then call avcodec_open2()
3808 * with a different codec.
3809 * If NULL, then the codec-specific defaults won't be initialized,
3810 * which may result in suboptimal default settings (this is
3811 * important mainly for encoders, e.g. libx264).
3813 * @return An AVCodecContext filled with default values or NULL on failure.
3814 * @see avcodec_get_context_defaults
3816 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3819 * Free the codec context and everything associated with it and write NULL to
3820 * the provided pointer.
3822 void avcodec_free_context(AVCodecContext **avctx);
3825 * Set the fields of the given AVCodecContext to default values corresponding
3826 * to the given codec (defaults may be codec-dependent).
3828 * Do not call this function if a non-NULL codec has been passed
3829 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3830 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3831 * different codec on this AVCodecContext.
3833 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3836 * Get the AVClass for AVCodecContext. It can be used in combination with
3837 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3839 * @see av_opt_find().
3841 const AVClass *avcodec_get_class(void);
3844 * Get the AVClass for AVFrame. It can be used in combination with
3845 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3847 * @see av_opt_find().
3849 const AVClass *avcodec_get_frame_class(void);
3852 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3853 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3855 * @see av_opt_find().
3857 const AVClass *avcodec_get_subtitle_rect_class(void);
3860 * Copy the settings of the source AVCodecContext into the destination
3861 * AVCodecContext. The resulting destination codec context will be
3862 * unopened, i.e. you are required to call avcodec_open2() before you
3863 * can use this AVCodecContext to decode/encode video/audio data.
3865 * @param dest target codec context, should be initialized with
3866 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3867 * @param src source codec context
3868 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3870 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3873 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3874 * function the context has to be allocated with avcodec_alloc_context3().
3876 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3877 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3878 * retrieving a codec.
3880 * @warning This function is not thread safe!
3882 * @note Always call this function before using decoding routines (such as
3883 * @ref avcodec_decode_video2()).
3886 * avcodec_register_all();
3887 * av_dict_set(&opts, "b", "2.5M", 0);
3888 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3892 * context = avcodec_alloc_context3(codec);
3894 * if (avcodec_open2(context, codec, opts) < 0)
3898 * @param avctx The context to initialize.
3899 * @param codec The codec to open this context for. If a non-NULL codec has been
3900 * previously passed to avcodec_alloc_context3() or
3901 * avcodec_get_context_defaults3() for this context, then this
3902 * parameter MUST be either NULL or equal to the previously passed
3904 * @param options A dictionary filled with AVCodecContext and codec-private options.
3905 * On return this object will be filled with options that were not found.
3907 * @return zero on success, a negative value on error
3908 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3909 * av_dict_set(), av_opt_find().
3911 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3914 * Close a given AVCodecContext and free all the data associated with it
3915 * (but not the AVCodecContext itself).
3917 * Calling this function on an AVCodecContext that hasn't been opened will free
3918 * the codec-specific data allocated in avcodec_alloc_context3() /
3919 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3922 int avcodec_close(AVCodecContext *avctx);
3925 * Free all allocated data in the given subtitle struct.
3927 * @param sub AVSubtitle to free.
3929 void avsubtitle_free(AVSubtitle *sub);
3936 * @addtogroup lavc_packet
3941 * Allocate an AVPacket and set its fields to default values. The resulting
3942 * struct must be freed using av_packet_free().
3944 * @return An AVPacket filled with default values or NULL on failure.
3946 * @note this only allocates the AVPacket itself, not the data buffers. Those
3947 * must be allocated through other means such as av_new_packet.
3949 * @see av_new_packet
3951 AVPacket *av_packet_alloc(void);
3954 * Create a new packet that references the same data as src.
3956 * This is a shortcut for av_packet_alloc()+av_packet_ref().
3958 * @return newly created AVPacket on success, NULL on error.
3960 * @see av_packet_alloc
3961 * @see av_packet_ref
3963 AVPacket *av_packet_clone(AVPacket *src);
3966 * Free the packet, if the packet is reference counted, it will be
3967 * unreferenced first.
3969 * @param packet packet to be freed. The pointer will be set to NULL.
3970 * @note passing NULL is a no-op.
3972 void av_packet_free(AVPacket **pkt);
3975 * Initialize optional fields of a packet with default values.
3977 * Note, this does not touch the data and size members, which have to be
3978 * initialized separately.
3982 void av_init_packet(AVPacket *pkt);
3985 * Allocate the payload of a packet and initialize its fields with
3989 * @param size wanted payload size
3990 * @return 0 if OK, AVERROR_xxx otherwise
3992 int av_new_packet(AVPacket *pkt, int size);
3995 * Reduce packet size, correctly zeroing padding
3998 * @param size new size
4000 void av_shrink_packet(AVPacket *pkt, int size);
4003 * Increase packet size, correctly zeroing padding
4006 * @param grow_by number of bytes by which to increase the size of the packet
4008 int av_grow_packet(AVPacket *pkt, int grow_by);
4011 * Initialize a reference-counted packet from av_malloc()ed data.
4013 * @param pkt packet to be initialized. This function will set the data, size,
4014 * buf and destruct fields, all others are left untouched.
4015 * @param data Data allocated by av_malloc() to be used as packet data. If this
4016 * function returns successfully, the data is owned by the underlying AVBuffer.
4017 * The caller may not access the data through other means.
4018 * @param size size of data in bytes, without the padding. I.e. the full buffer
4019 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4021 * @return 0 on success, a negative AVERROR on error
4023 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4025 #if FF_API_AVPACKET_OLD_API
4027 * @warning This is a hack - the packet memory allocation stuff is broken. The
4028 * packet is allocated if it was not really allocated.
4030 * @deprecated Use av_packet_ref
4032 attribute_deprecated
4033 int av_dup_packet(AVPacket *pkt);
4035 * Copy packet, including contents
4037 * @return 0 on success, negative AVERROR on fail
4039 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4042 * Copy packet side data
4044 * @return 0 on success, negative AVERROR on fail
4046 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4051 * @deprecated Use av_packet_unref
4053 * @param pkt packet to free
4055 attribute_deprecated
4056 void av_free_packet(AVPacket *pkt);
4059 * Allocate new information of a packet.
4062 * @param type side information type
4063 * @param size side information size
4064 * @return pointer to fresh allocated data or NULL otherwise
4066 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4070 * Wrap an existing array as a packet side data.
4073 * @param type side information type
4074 * @param data the side data array. It must be allocated with the av_malloc()
4075 * family of functions. The ownership of the data is transferred to
4077 * @param size side information size
4078 * @return a non-negative number on success, a negative AVERROR code on
4079 * failure. On failure, the packet is unchanged and the data remains
4080 * owned by the caller.
4082 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4083 uint8_t *data, size_t size);
4086 * Shrink the already allocated side data buffer
4089 * @param type side information type
4090 * @param size new side information size
4091 * @return 0 on success, < 0 on failure
4093 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4097 * Get side information from packet.
4100 * @param type desired side information type
4101 * @param size pointer for side information size to store (optional)
4102 * @return pointer to data if present or NULL otherwise
4104 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4107 int av_packet_merge_side_data(AVPacket *pkt);
4109 int av_packet_split_side_data(AVPacket *pkt);
4111 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4114 * Pack a dictionary for use in side_data.
4116 * @param dict The dictionary to pack.
4117 * @param size pointer to store the size of the returned data
4118 * @return pointer to data if successful, NULL otherwise
4120 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4122 * Unpack a dictionary from side_data.
4124 * @param data data from side_data
4125 * @param size size of the data
4126 * @param dict the metadata storage dictionary
4127 * @return 0 on success, < 0 on failure
4129 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4133 * Convenience function to free all the side data stored.
4134 * All the other fields stay untouched.
4138 void av_packet_free_side_data(AVPacket *pkt);
4141 * Setup a new reference to the data described by a given packet
4143 * If src is reference-counted, setup dst as a new reference to the
4144 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4145 * data from src into it.
4147 * All the other fields are copied from src.
4149 * @see av_packet_unref
4151 * @param dst Destination packet
4152 * @param src Source packet
4154 * @return 0 on success, a negative AVERROR on error.
4156 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4161 * Unreference the buffer referenced by the packet and reset the
4162 * remaining packet fields to their default values.
4164 * @param pkt The packet to be unreferenced.
4166 void av_packet_unref(AVPacket *pkt);
4169 * Move every field in src to dst and reset src.
4171 * @see av_packet_unref
4173 * @param src Source packet, will be reset
4174 * @param dst Destination packet
4176 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4179 * Copy only "properties" fields from src to dst.
4181 * Properties for the purpose of this function are all the fields
4182 * beside those related to the packet data (buf, data, size)
4184 * @param dst Destination packet
4185 * @param src Source packet
4187 * @return 0 on success AVERROR on failure.
4190 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4193 * Convert valid timing fields (timestamps / durations) in a packet from one
4194 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4197 * @param pkt packet on which the conversion will be performed
4198 * @param tb_src source timebase, in which the timing fields in pkt are
4200 * @param tb_dst destination timebase, to which the timing fields will be
4203 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4210 * @addtogroup lavc_decoding
4215 * Find a registered decoder with a matching codec ID.
4217 * @param id AVCodecID of the requested decoder
4218 * @return A decoder if one was found, NULL otherwise.
4220 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4223 * Find a registered decoder with the specified name.
4225 * @param name name of the requested decoder
4226 * @return A decoder if one was found, NULL otherwise.
4228 AVCodec *avcodec_find_decoder_by_name(const char *name);
4231 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4232 * it can be called by custom get_buffer2() implementations for decoders without
4233 * AV_CODEC_CAP_DR1 set.
4235 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4239 * Return the amount of padding in pixels which the get_buffer callback must
4240 * provide around the edge of the image for codecs which do not have the
4241 * CODEC_FLAG_EMU_EDGE flag.
4243 * @return Required padding in pixels.
4245 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4248 attribute_deprecated
4249 unsigned avcodec_get_edge_width(void);
4253 * Modify width and height values so that they will result in a memory
4254 * buffer that is acceptable for the codec if you do not use any horizontal
4257 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4259 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4262 * Modify width and height values so that they will result in a memory
4263 * buffer that is acceptable for the codec if you also ensure that all
4264 * line sizes are a multiple of the respective linesize_align[i].
4266 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4268 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4269 int linesize_align[AV_NUM_DATA_POINTERS]);
4272 * Converts AVChromaLocation to swscale x/y chroma position.
4274 * The positions represent the chroma (0,0) position in a coordinates system
4275 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4277 * @param xpos horizontal chroma sample position
4278 * @param ypos vertical chroma sample position
4280 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4283 * Converts swscale x/y chroma position to AVChromaLocation.
4285 * The positions represent the chroma (0,0) position in a coordinates system
4286 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4288 * @param xpos horizontal chroma sample position
4289 * @param ypos vertical chroma sample position
4291 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4294 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4296 * Some decoders may support multiple frames in a single AVPacket. Such
4297 * decoders would then just decode the first frame and the return value would be
4298 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4299 * called again with an AVPacket containing the remaining data in order to
4300 * decode the second frame, etc... Even if no frames are returned, the packet
4301 * needs to be fed to the decoder with remaining data until it is completely
4302 * consumed or an error occurs.
4304 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4305 * and output. This means that for some packets they will not immediately
4306 * produce decoded output and need to be flushed at the end of decoding to get
4307 * all the decoded data. Flushing is done by calling this function with packets
4308 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4309 * returning samples. It is safe to flush even those decoders that are not
4310 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4312 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4313 * larger than the actual read bytes because some optimized bitstream
4314 * readers read 32 or 64 bits at once and could read over the end.
4316 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4317 * before packets may be fed to the decoder.
4319 * @param avctx the codec context
4320 * @param[out] frame The AVFrame in which to store decoded audio samples.
4321 * The decoder will allocate a buffer for the decoded frame by
4322 * calling the AVCodecContext.get_buffer2() callback.
4323 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4324 * reference counted and the returned reference belongs to the
4325 * caller. The caller must release the frame using av_frame_unref()
4326 * when the frame is no longer needed. The caller may safely write
4327 * to the frame if av_frame_is_writable() returns 1.
4328 * When AVCodecContext.refcounted_frames is set to 0, the returned
4329 * reference belongs to the decoder and is valid only until the
4330 * next call to this function or until closing or flushing the
4331 * decoder. The caller may not write to it.
4332 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4333 * non-zero. Note that this field being set to zero
4334 * does not mean that an error has occurred. For
4335 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4336 * call is guaranteed to produce a frame.
4337 * @param[in] avpkt The input AVPacket containing the input buffer.
4338 * At least avpkt->data and avpkt->size should be set. Some
4339 * decoders might also require additional fields to be set.
4340 * @return A negative error code is returned if an error occurred during
4341 * decoding, otherwise the number of bytes consumed from the input
4342 * AVPacket is returned.
4344 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4345 int *got_frame_ptr, const AVPacket *avpkt);
4348 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4349 * Some decoders may support multiple frames in a single AVPacket, such
4350 * decoders would then just decode the first frame.
4352 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4353 * the actual read bytes because some optimized bitstream readers read 32 or 64
4354 * bits at once and could read over the end.
4356 * @warning The end of the input buffer buf should be set to 0 to ensure that
4357 * no overreading happens for damaged MPEG streams.
4359 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4360 * between input and output, these need to be fed with avpkt->data=NULL,
4361 * avpkt->size=0 at the end to return the remaining frames.
4363 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4364 * before packets may be fed to the decoder.
4366 * @param avctx the codec context
4367 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4368 * Use av_frame_alloc() to get an AVFrame. The codec will
4369 * allocate memory for the actual bitmap by calling the
4370 * AVCodecContext.get_buffer2() callback.
4371 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4372 * reference counted and the returned reference belongs to the
4373 * caller. The caller must release the frame using av_frame_unref()
4374 * when the frame is no longer needed. The caller may safely write
4375 * to the frame if av_frame_is_writable() returns 1.
4376 * When AVCodecContext.refcounted_frames is set to 0, the returned
4377 * reference belongs to the decoder and is valid only until the
4378 * next call to this function or until closing or flushing the
4379 * decoder. The caller may not write to it.
4381 * @param[in] avpkt The input AVPacket containing the input buffer.
4382 * You can create such packet with av_init_packet() and by then setting
4383 * data and size, some decoders might in addition need other fields like
4384 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4386 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4387 * @return On error a negative value is returned, otherwise the number of bytes
4388 * used or zero if no frame could be decompressed.
4390 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4391 int *got_picture_ptr,
4392 const AVPacket *avpkt);
4395 * Decode a subtitle message.
4396 * Return a negative value on error, otherwise return the number of bytes used.
4397 * If no subtitle could be decompressed, got_sub_ptr is zero.
4398 * Otherwise, the subtitle is stored in *sub.
4399 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4400 * simplicity, because the performance difference is expect to be negligible
4401 * and reusing a get_buffer written for video codecs would probably perform badly
4402 * due to a potentially very different allocation pattern.
4404 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4405 * and output. This means that for some packets they will not immediately
4406 * produce decoded output and need to be flushed at the end of decoding to get
4407 * all the decoded data. Flushing is done by calling this function with packets
4408 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4409 * returning subtitles. It is safe to flush even those decoders that are not
4410 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4412 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4413 * before packets may be fed to the decoder.
4415 * @param avctx the codec context
4416 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4417 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4418 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4419 * @param[in] avpkt The input AVPacket containing the input buffer.
4421 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4426 * @defgroup lavc_parsing Frame parsing
4430 enum AVPictureStructure {
4431 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4432 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4433 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4434 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4437 typedef struct AVCodecParserContext {
4439 struct AVCodecParser *parser;
4440 int64_t frame_offset; /* offset of the current frame */
4441 int64_t cur_offset; /* current offset
4442 (incremented by each av_parser_parse()) */
4443 int64_t next_frame_offset; /* offset of the next frame */
4445 int pict_type; /* XXX: Put it back in AVCodecContext. */
4447 * This field is used for proper frame duration computation in lavf.
4448 * It signals, how much longer the frame duration of the current frame
4449 * is compared to normal frame duration.
4451 * frame_duration = (1 + repeat_pict) * time_base
4453 * It is used by codecs like H.264 to display telecined material.
4455 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4456 int64_t pts; /* pts of the current frame */
4457 int64_t dts; /* dts of the current frame */
4462 int fetch_timestamp;
4464 #define AV_PARSER_PTS_NB 4
4465 int cur_frame_start_index;
4466 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4467 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4468 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4471 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4472 #define PARSER_FLAG_ONCE 0x0002
4473 /// Set if the parser has a valid file offset
4474 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4475 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4477 int64_t offset; ///< byte offset from starting packet start
4478 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4481 * Set by parser to 1 for key frames and 0 for non-key frames.
4482 * It is initialized to -1, so if the parser doesn't set this flag,
4483 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4488 #if FF_API_CONVERGENCE_DURATION
4490 * @deprecated unused
4492 attribute_deprecated
4493 int64_t convergence_duration;
4496 // Timestamp generation support:
4498 * Synchronization point for start of timestamp generation.
4500 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4503 * For example, this corresponds to presence of H.264 buffering period
4509 * Offset of the current timestamp against last timestamp sync point in
4510 * units of AVCodecContext.time_base.
4512 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4513 * contain a valid timestamp offset.
4515 * Note that the timestamp of sync point has usually a nonzero
4516 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4517 * the next frame after timestamp sync point will be usually 1.
4519 * For example, this corresponds to H.264 cpb_removal_delay.
4521 int dts_ref_dts_delta;
4524 * Presentation delay of current frame in units of AVCodecContext.time_base.
4526 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4527 * contain valid non-negative timestamp delta (presentation time of a frame
4528 * must not lie in the past).
4530 * This delay represents the difference between decoding and presentation
4531 * time of the frame.
4533 * For example, this corresponds to H.264 dpb_output_delay.
4538 * Position of the packet in file.
4540 * Analogous to cur_frame_pts/dts
4542 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4545 * Byte position of currently parsed frame in stream.
4550 * Previous frame byte position.
4555 * Duration of the current frame.
4556 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4557 * For all other types, this is in units of AVCodecContext.time_base.
4561 enum AVFieldOrder field_order;
4564 * Indicate whether a picture is coded as a frame, top field or bottom field.
4566 * For example, H.264 field_pic_flag equal to 0 corresponds to
4567 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4568 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4569 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4571 enum AVPictureStructure picture_structure;
4574 * Picture number incremented in presentation or output order.
4575 * This field may be reinitialized at the first picture of a new sequence.
4577 * For example, this corresponds to H.264 PicOrderCnt.
4579 int output_picture_number;
4582 * Dimensions of the decoded video intended for presentation.
4588 * Dimensions of the coded video.
4594 * The format of the coded data, corresponds to enum AVPixelFormat for video
4595 * and for enum AVSampleFormat for audio.
4597 * Note that a decoder can have considerable freedom in how exactly it
4598 * decodes the data, so the format reported here might be different from the
4599 * one returned by a decoder.
4602 } AVCodecParserContext;
4604 typedef struct AVCodecParser {
4605 int codec_ids[5]; /* several codec IDs are permitted */
4607 int (*parser_init)(AVCodecParserContext *s);
4608 /* This callback never returns an error, a negative value means that
4609 * the frame start was in a previous packet. */
4610 int (*parser_parse)(AVCodecParserContext *s,
4611 AVCodecContext *avctx,
4612 const uint8_t **poutbuf, int *poutbuf_size,
4613 const uint8_t *buf, int buf_size);
4614 void (*parser_close)(AVCodecParserContext *s);
4615 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4616 struct AVCodecParser *next;
4619 AVCodecParser *av_parser_next(const AVCodecParser *c);
4621 void av_register_codec_parser(AVCodecParser *parser);
4622 AVCodecParserContext *av_parser_init(int codec_id);
4627 * @param s parser context.
4628 * @param avctx codec context.
4629 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4630 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4631 * @param buf input buffer.
4632 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4633 * @param pts input presentation timestamp.
4634 * @param dts input decoding timestamp.
4635 * @param pos input byte position in stream.
4636 * @return the number of bytes of the input bitstream used.
4641 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4648 * decode_frame(data, size);
4652 int av_parser_parse2(AVCodecParserContext *s,
4653 AVCodecContext *avctx,
4654 uint8_t **poutbuf, int *poutbuf_size,
4655 const uint8_t *buf, int buf_size,
4656 int64_t pts, int64_t dts,
4660 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4661 * @deprecated use AVBitStreamFilter
4663 int av_parser_change(AVCodecParserContext *s,
4664 AVCodecContext *avctx,
4665 uint8_t **poutbuf, int *poutbuf_size,
4666 const uint8_t *buf, int buf_size, int keyframe);
4667 void av_parser_close(AVCodecParserContext *s);
4675 * @addtogroup lavc_encoding
4680 * Find a registered encoder with a matching codec ID.
4682 * @param id AVCodecID of the requested encoder
4683 * @return An encoder if one was found, NULL otherwise.
4685 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4688 * Find a registered encoder with the specified name.
4690 * @param name name of the requested encoder
4691 * @return An encoder if one was found, NULL otherwise.
4693 AVCodec *avcodec_find_encoder_by_name(const char *name);
4696 * Encode a frame of audio.
4698 * Takes input samples from frame and writes the next output packet, if
4699 * available, to avpkt. The output packet does not necessarily contain data for
4700 * the most recent frame, as encoders can delay, split, and combine input frames
4701 * internally as needed.
4703 * @param avctx codec context
4704 * @param avpkt output AVPacket.
4705 * The user can supply an output buffer by setting
4706 * avpkt->data and avpkt->size prior to calling the
4707 * function, but if the size of the user-provided data is not
4708 * large enough, encoding will fail. If avpkt->data and
4709 * avpkt->size are set, avpkt->destruct must also be set. All
4710 * other AVPacket fields will be reset by the encoder using
4711 * av_init_packet(). If avpkt->data is NULL, the encoder will
4712 * allocate it. The encoder will set avpkt->size to the size
4713 * of the output packet.
4715 * If this function fails or produces no output, avpkt will be
4716 * freed using av_packet_unref().
4717 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4718 * May be NULL when flushing an encoder that has the
4719 * AV_CODEC_CAP_DELAY capability set.
4720 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4721 * can have any number of samples.
4722 * If it is not set, frame->nb_samples must be equal to
4723 * avctx->frame_size for all frames except the last.
4724 * The final frame may be smaller than avctx->frame_size.
4725 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4726 * output packet is non-empty, and to 0 if it is
4727 * empty. If the function returns an error, the
4728 * packet can be assumed to be invalid, and the
4729 * value of got_packet_ptr is undefined and should
4731 * @return 0 on success, negative error code on failure
4733 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4734 const AVFrame *frame, int *got_packet_ptr);
4737 * Encode a frame of video.
4739 * Takes input raw video data from frame and writes the next output packet, if
4740 * available, to avpkt. The output packet does not necessarily contain data for
4741 * the most recent frame, as encoders can delay and reorder input frames
4742 * internally as needed.
4744 * @param avctx codec context
4745 * @param avpkt output AVPacket.
4746 * The user can supply an output buffer by setting
4747 * avpkt->data and avpkt->size prior to calling the
4748 * function, but if the size of the user-provided data is not
4749 * large enough, encoding will fail. All other AVPacket fields
4750 * will be reset by the encoder using av_init_packet(). If
4751 * avpkt->data is NULL, the encoder will allocate it.
4752 * The encoder will set avpkt->size to the size of the
4753 * output packet. The returned data (if any) belongs to the
4754 * caller, he is responsible for freeing it.
4756 * If this function fails or produces no output, avpkt will be
4757 * freed using av_packet_unref().
4758 * @param[in] frame AVFrame containing the raw video data to be encoded.
4759 * May be NULL when flushing an encoder that has the
4760 * AV_CODEC_CAP_DELAY capability set.
4761 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4762 * output packet is non-empty, and to 0 if it is
4763 * empty. If the function returns an error, the
4764 * packet can be assumed to be invalid, and the
4765 * value of got_packet_ptr is undefined and should
4767 * @return 0 on success, negative error code on failure
4769 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4770 const AVFrame *frame, int *got_packet_ptr);
4772 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4773 const AVSubtitle *sub);
4780 #if FF_API_AVCODEC_RESAMPLE
4782 * @defgroup lavc_resample Audio resampling
4784 * @deprecated use libswresample instead
4788 struct ReSampleContext;
4789 struct AVResampleContext;
4791 typedef struct ReSampleContext ReSampleContext;
4794 * Initialize audio resampling context.
4796 * @param output_channels number of output channels
4797 * @param input_channels number of input channels
4798 * @param output_rate output sample rate
4799 * @param input_rate input sample rate
4800 * @param sample_fmt_out requested output sample format
4801 * @param sample_fmt_in input sample format
4802 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4803 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4804 * @param linear if 1 then the used FIR filter will be linearly interpolated
4805 between the 2 closest, if 0 the closest will be used
4806 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4807 * @return allocated ReSampleContext, NULL if error occurred
4809 attribute_deprecated
4810 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4811 int output_rate, int input_rate,
4812 enum AVSampleFormat sample_fmt_out,
4813 enum AVSampleFormat sample_fmt_in,
4814 int filter_length, int log2_phase_count,
4815 int linear, double cutoff);
4817 attribute_deprecated
4818 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4821 * Free resample context.
4823 * @param s a non-NULL pointer to a resample context previously
4824 * created with av_audio_resample_init()
4826 attribute_deprecated
4827 void audio_resample_close(ReSampleContext *s);
4831 * Initialize an audio resampler.
4832 * Note, if either rate is not an integer then simply scale both rates up so they are.
4833 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4834 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4835 * @param linear If 1 then the used FIR filter will be linearly interpolated
4836 between the 2 closest, if 0 the closest will be used
4837 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4839 attribute_deprecated
4840 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4843 * Resample an array of samples using a previously configured context.
4844 * @param src an array of unconsumed samples
4845 * @param consumed the number of samples of src which have been consumed are returned here
4846 * @param src_size the number of unconsumed samples available
4847 * @param dst_size the amount of space in samples available in dst
4848 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
4849 * @return the number of samples written in dst or -1 if an error occurred
4851 attribute_deprecated
4852 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4856 * Compensate samplerate/timestamp drift. The compensation is done by changing
4857 * the resampler parameters, so no audible clicks or similar distortions occur
4858 * @param compensation_distance distance in output samples over which the compensation should be performed
4859 * @param sample_delta number of output samples which should be output less
4861 * example: av_resample_compensate(c, 10, 500)
4862 * here instead of 510 samples only 500 samples would be output
4864 * note, due to rounding the actual compensation might be slightly different,
4865 * especially if the compensation_distance is large and the in_rate used during init is small
4867 attribute_deprecated
4868 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4869 attribute_deprecated
4870 void av_resample_close(struct AVResampleContext *c);
4877 #if FF_API_AVPICTURE
4879 * @addtogroup lavc_picture
4884 * @deprecated unused
4886 attribute_deprecated
4887 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4890 * @deprecated unused
4892 attribute_deprecated
4893 void avpicture_free(AVPicture *picture);
4896 * @deprecated use av_image_fill_arrays() instead.
4898 attribute_deprecated
4899 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4900 enum AVPixelFormat pix_fmt, int width, int height);
4903 * @deprecated use av_image_copy_to_buffer() instead.
4905 attribute_deprecated
4906 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4907 int width, int height,
4908 unsigned char *dest, int dest_size);
4911 * @deprecated use av_image_get_buffer_size() instead.
4913 attribute_deprecated
4914 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4917 * @deprecated av_image_copy() instead.
4919 attribute_deprecated
4920 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4921 enum AVPixelFormat pix_fmt, int width, int height);
4924 * @deprecated unused
4926 attribute_deprecated
4927 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4928 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4931 * @deprecated unused
4933 attribute_deprecated
4934 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4935 int padtop, int padbottom, int padleft, int padright, int *color);
4943 * @defgroup lavc_misc Utility functions
4946 * Miscellaneous utility functions related to both encoding and decoding
4952 * @defgroup lavc_misc_pixfmt Pixel formats
4954 * Functions for working with pixel formats.
4959 * Utility function to access log2_chroma_w log2_chroma_h from
4960 * the pixel format AVPixFmtDescriptor.
4962 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4963 * for one that returns a failure code and continues in case of invalid
4966 * @param[in] pix_fmt the pixel format
4967 * @param[out] h_shift store log2_chroma_w
4968 * @param[out] v_shift store log2_chroma_h
4970 * @see av_pix_fmt_get_chroma_sub_sample
4973 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4976 * Return a value representing the fourCC code associated to the
4977 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4980 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4983 * @deprecated see av_get_pix_fmt_loss()
4985 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4989 * Find the best pixel format to convert to given a certain source pixel
4990 * format. When converting from one pixel format to another, information loss
4991 * may occur. For example, when converting from RGB24 to GRAY, the color
4992 * information will be lost. Similarly, other losses occur when converting from
4993 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4994 * the given pixel formats should be used to suffer the least amount of loss.
4995 * The pixel formats from which it chooses one, are determined by the
4996 * pix_fmt_list parameter.
4999 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5000 * @param[in] src_pix_fmt source pixel format
5001 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5002 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5003 * @return The best pixel format to convert to or -1 if none was found.
5005 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5006 enum AVPixelFormat src_pix_fmt,
5007 int has_alpha, int *loss_ptr);
5010 * @deprecated see av_find_best_pix_fmt_of_2()
5012 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5013 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5015 attribute_deprecated
5016 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
5017 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
5018 enum AVPixelFormat src_pix_fmt,
5019 int has_alpha, int *loss_ptr);
5021 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5022 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5026 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5032 #if FF_API_SET_DIMENSIONS
5034 * @deprecated this function is not supposed to be used from outside of lavc
5036 attribute_deprecated
5037 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
5041 * Put a string representing the codec tag codec_tag in buf.
5043 * @param buf buffer to place codec tag in
5044 * @param buf_size size in bytes of buf
5045 * @param codec_tag codec tag to assign
5046 * @return the length of the string that would have been generated if
5047 * enough space had been available, excluding the trailing null
5049 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5051 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5054 * Return a name for the specified profile, if available.
5056 * @param codec the codec that is searched for the given profile
5057 * @param profile the profile value for which a name is requested
5058 * @return A name for the profile if found, NULL otherwise.
5060 const char *av_get_profile_name(const AVCodec *codec, int profile);
5063 * Return a name for the specified profile, if available.
5065 * @param codec_id the ID of the codec to which the requested profile belongs
5066 * @param profile the profile value for which a name is requested
5067 * @return A name for the profile if found, NULL otherwise.
5069 * @note unlike av_get_profile_name(), which searches a list of profiles
5070 * supported by a specific decoder or encoder implementation, this
5071 * function searches the list of profiles from the AVCodecDescriptor
5073 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
5075 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5076 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5077 //FIXME func typedef
5080 * Fill AVFrame audio data and linesize pointers.
5082 * The buffer buf must be a preallocated buffer with a size big enough
5083 * to contain the specified samples amount. The filled AVFrame data
5084 * pointers will point to this buffer.
5086 * AVFrame extended_data channel pointers are allocated if necessary for
5089 * @param frame the AVFrame
5090 * frame->nb_samples must be set prior to calling the
5091 * function. This function fills in frame->data,
5092 * frame->extended_data, frame->linesize[0].
5093 * @param nb_channels channel count
5094 * @param sample_fmt sample format
5095 * @param buf buffer to use for frame data
5096 * @param buf_size size of buffer
5097 * @param align plane size sample alignment (0 = default)
5098 * @return >=0 on success, negative error code on failure
5099 * @todo return the size in bytes required to store the samples in
5100 * case of success, at the next libavutil bump
5102 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5103 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5104 int buf_size, int align);
5107 * Reset the internal decoder state / flush internal buffers. Should be called
5108 * e.g. when seeking or when switching to a different stream.
5110 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5111 * this invalidates the frames previously returned from the decoder. When
5112 * refcounted frames are used, the decoder just releases any references it might
5113 * keep internally, but the caller's reference remains valid.
5115 void avcodec_flush_buffers(AVCodecContext *avctx);
5118 * Return codec bits per sample.
5120 * @param[in] codec_id the codec
5121 * @return Number of bits per sample or zero if unknown for the given codec.
5123 int av_get_bits_per_sample(enum AVCodecID codec_id);
5126 * Return the PCM codec associated with a sample format.
5127 * @param be endianness, 0 for little, 1 for big,
5128 * -1 (or anything else) for native
5129 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5131 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5134 * Return codec bits per sample.
5135 * Only return non-zero if the bits per sample is exactly correct, not an
5138 * @param[in] codec_id the codec
5139 * @return Number of bits per sample or zero if unknown for the given codec.
5141 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5144 * Return audio frame duration.
5146 * @param avctx codec context
5147 * @param frame_bytes size of the frame, or 0 if unknown
5148 * @return frame duration, in samples, if known. 0 if not able to
5151 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5154 typedef struct AVBitStreamFilterContext {
5156 struct AVBitStreamFilter *filter;
5157 AVCodecParserContext *parser;
5158 struct AVBitStreamFilterContext *next;
5160 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5161 * Not for access by library users.
5164 } AVBitStreamFilterContext;
5167 typedef struct AVBitStreamFilter {
5170 int (*filter)(AVBitStreamFilterContext *bsfc,
5171 AVCodecContext *avctx, const char *args,
5172 uint8_t **poutbuf, int *poutbuf_size,
5173 const uint8_t *buf, int buf_size, int keyframe);
5174 void (*close)(AVBitStreamFilterContext *bsfc);
5175 struct AVBitStreamFilter *next;
5176 } AVBitStreamFilter;
5179 * Register a bitstream filter.
5181 * The filter will be accessible to the application code through
5182 * av_bitstream_filter_next() or can be directly initialized with
5183 * av_bitstream_filter_init().
5185 * @see avcodec_register_all()
5187 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5190 * Create and initialize a bitstream filter context given a bitstream
5193 * The returned context must be freed with av_bitstream_filter_close().
5195 * @param name the name of the bitstream filter
5196 * @return a bitstream filter context if a matching filter was found
5197 * and successfully initialized, NULL otherwise
5199 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5204 * This function filters the buffer buf with size buf_size, and places the
5205 * filtered buffer in the buffer pointed to by poutbuf.
5207 * The output buffer must be freed by the caller.
5209 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5210 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5211 * If specified, this must point to the encoder context of the
5212 * output stream the packet is sent to.
5213 * @param args arguments which specify the filter configuration, may be NULL
5214 * @param poutbuf pointer which is updated to point to the filtered buffer
5215 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5216 * @param buf buffer containing the data to filter
5217 * @param buf_size size in bytes of buf
5218 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5219 * @return >= 0 in case of success, or a negative error code in case of failure
5221 * If the return value is positive, an output buffer is allocated and
5222 * is available in *poutbuf, and is distinct from the input buffer.
5224 * If the return value is 0, the output buffer is not allocated and
5225 * should be considered identical to the input buffer, or in case
5226 * *poutbuf was set it points to the input buffer (not necessarily to
5227 * its starting address).
5229 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5230 AVCodecContext *avctx, const char *args,
5231 uint8_t **poutbuf, int *poutbuf_size,
5232 const uint8_t *buf, int buf_size, int keyframe);
5235 * Release bitstream filter context.
5237 * @param bsf the bitstream filter context created with
5238 * av_bitstream_filter_init(), can be NULL
5240 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5243 * If f is NULL, return the first registered bitstream filter,
5244 * if f is non-NULL, return the next registered bitstream filter
5245 * after f, or NULL if f is the last one.
5247 * This function can be used to iterate over all registered bitstream
5250 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5255 * Same behaviour av_fast_malloc but the buffer has additional
5256 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5258 * In addition the whole buffer will initially and after resizes
5259 * be 0-initialized so that no uninitialized data will ever appear.
5261 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5264 * Same behaviour av_fast_padded_malloc except that buffer will always
5265 * be 0-initialized after call.
5267 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5270 * Encode extradata length to a buffer. Used by xiph codecs.
5272 * @param s buffer to write to; must be at least (v/255+1) bytes long
5273 * @param v size of extradata in bytes
5274 * @return number of bytes written to the buffer.
5276 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5278 #if FF_API_MISSING_SAMPLE
5280 * Log a generic warning message about a missing feature. This function is
5281 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5282 * only, and would normally not be used by applications.
5283 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5284 * a pointer to an AVClass struct
5285 * @param[in] feature string containing the name of the missing feature
5286 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5287 * If want_sample is non-zero, additional verbage will be added to the log
5288 * message which tells the user how to report samples to the development
5290 * @deprecated Use avpriv_report_missing_feature() instead.
5292 attribute_deprecated
5293 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5296 * Log a generic warning message asking for a sample. This function is
5297 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5298 * only, and would normally not be used by applications.
5299 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5300 * a pointer to an AVClass struct
5301 * @param[in] msg string containing an optional message, or NULL if no message
5302 * @deprecated Use avpriv_request_sample() instead.
5304 attribute_deprecated
5305 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5306 #endif /* FF_API_MISSING_SAMPLE */
5309 * Register the hardware accelerator hwaccel.
5311 void av_register_hwaccel(AVHWAccel *hwaccel);
5314 * If hwaccel is NULL, returns the first registered hardware accelerator,
5315 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5316 * after hwaccel, or NULL if hwaccel is the last one.
5318 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5322 * Lock operation used by lockmgr
5325 AV_LOCK_CREATE, ///< Create a mutex
5326 AV_LOCK_OBTAIN, ///< Lock the mutex
5327 AV_LOCK_RELEASE, ///< Unlock the mutex
5328 AV_LOCK_DESTROY, ///< Free mutex resources
5332 * Register a user provided lock manager supporting the operations
5333 * specified by AVLockOp. The "mutex" argument to the function points
5334 * to a (void *) where the lockmgr should store/get a pointer to a user
5335 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5336 * value left by the last call for all other ops. If the lock manager is
5337 * unable to perform the op then it should leave the mutex in the same
5338 * state as when it was called and return a non-zero value. However,
5339 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5340 * have been successfully destroyed. If av_lockmgr_register succeeds
5341 * it will return a non-negative value, if it fails it will return a
5342 * negative value and destroy all mutex and unregister all callbacks.
5343 * av_lockmgr_register is not thread-safe, it must be called from a
5344 * single thread before any calls which make use of locking are used.
5346 * @param cb User defined callback. av_lockmgr_register invokes calls
5347 * to this callback and the previously registered callback.
5348 * The callback will be used to create more than one mutex
5349 * each of which must be backed by its own underlying locking
5350 * mechanism (i.e. do not use a single static object to
5351 * implement your lock manager). If cb is set to NULL the
5352 * lockmgr will be unregistered.
5354 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5357 * Get the type of the given codec.
5359 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5362 * Get the name of a codec.
5363 * @return a static string identifying the codec; never NULL
5365 const char *avcodec_get_name(enum AVCodecID id);
5368 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5369 * with no corresponding avcodec_close()), 0 otherwise.
5371 int avcodec_is_open(AVCodecContext *s);
5374 * @return a non-zero number if codec is an encoder, zero otherwise
5376 int av_codec_is_encoder(const AVCodec *codec);
5379 * @return a non-zero number if codec is a decoder, zero otherwise
5381 int av_codec_is_decoder(const AVCodec *codec);
5384 * @return descriptor for given codec ID or NULL if no descriptor exists.
5386 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5389 * Iterate over all codec descriptors known to libavcodec.
5391 * @param prev previous descriptor. NULL to get the first descriptor.
5393 * @return next descriptor or NULL after the last descriptor
5395 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5398 * @return codec descriptor with the given name or NULL if no such descriptor
5401 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5404 * Allocate a CPB properties structure and initialize its fields to default
5407 * @param size if non-NULL, the size of the allocated struct will be written
5408 * here. This is useful for embedding it in side data.
5410 * @return the newly allocated struct or NULL on failure
5412 AVCPBProperties *av_cpb_properties_alloc(size_t *size);
5418 #endif /* AVCODEC_AVCODEC_H */