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,
301 AV_CODEC_ID_Y41P = 0x8000,
306 AV_CODEC_ID_TARGA_Y216,
318 /* various PCM "codecs" */
319 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
320 AV_CODEC_ID_PCM_S16LE = 0x10000,
321 AV_CODEC_ID_PCM_S16BE,
322 AV_CODEC_ID_PCM_U16LE,
323 AV_CODEC_ID_PCM_U16BE,
326 AV_CODEC_ID_PCM_MULAW,
327 AV_CODEC_ID_PCM_ALAW,
328 AV_CODEC_ID_PCM_S32LE,
329 AV_CODEC_ID_PCM_S32BE,
330 AV_CODEC_ID_PCM_U32LE,
331 AV_CODEC_ID_PCM_U32BE,
332 AV_CODEC_ID_PCM_S24LE,
333 AV_CODEC_ID_PCM_S24BE,
334 AV_CODEC_ID_PCM_U24LE,
335 AV_CODEC_ID_PCM_U24BE,
336 AV_CODEC_ID_PCM_S24DAUD,
337 AV_CODEC_ID_PCM_ZORK,
338 AV_CODEC_ID_PCM_S16LE_PLANAR,
340 AV_CODEC_ID_PCM_F32BE,
341 AV_CODEC_ID_PCM_F32LE,
342 AV_CODEC_ID_PCM_F64BE,
343 AV_CODEC_ID_PCM_F64LE,
344 AV_CODEC_ID_PCM_BLURAY,
347 AV_CODEC_ID_PCM_S8_PLANAR,
348 AV_CODEC_ID_PCM_S24LE_PLANAR,
349 AV_CODEC_ID_PCM_S32LE_PLANAR,
350 AV_CODEC_ID_PCM_S16BE_PLANAR,
351 /* new PCM "codecs" should be added right below this line starting with
352 * an explicit value of for example 0x10800
355 /* various ADPCM codecs */
356 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
357 AV_CODEC_ID_ADPCM_IMA_WAV,
358 AV_CODEC_ID_ADPCM_IMA_DK3,
359 AV_CODEC_ID_ADPCM_IMA_DK4,
360 AV_CODEC_ID_ADPCM_IMA_WS,
361 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
362 AV_CODEC_ID_ADPCM_MS,
363 AV_CODEC_ID_ADPCM_4XM,
364 AV_CODEC_ID_ADPCM_XA,
365 AV_CODEC_ID_ADPCM_ADX,
366 AV_CODEC_ID_ADPCM_EA,
367 AV_CODEC_ID_ADPCM_G726,
368 AV_CODEC_ID_ADPCM_CT,
369 AV_CODEC_ID_ADPCM_SWF,
370 AV_CODEC_ID_ADPCM_YAMAHA,
371 AV_CODEC_ID_ADPCM_SBPRO_4,
372 AV_CODEC_ID_ADPCM_SBPRO_3,
373 AV_CODEC_ID_ADPCM_SBPRO_2,
374 AV_CODEC_ID_ADPCM_THP,
375 AV_CODEC_ID_ADPCM_IMA_AMV,
376 AV_CODEC_ID_ADPCM_EA_R1,
377 AV_CODEC_ID_ADPCM_EA_R3,
378 AV_CODEC_ID_ADPCM_EA_R2,
379 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
380 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
381 AV_CODEC_ID_ADPCM_EA_XAS,
382 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
383 AV_CODEC_ID_ADPCM_IMA_ISS,
384 AV_CODEC_ID_ADPCM_G722,
385 AV_CODEC_ID_ADPCM_IMA_APC,
386 AV_CODEC_ID_ADPCM_VIMA,
387 #if FF_API_VIMA_DECODER
388 AV_CODEC_ID_VIMA = AV_CODEC_ID_ADPCM_VIMA,
391 AV_CODEC_ID_ADPCM_AFC = 0x11800,
392 AV_CODEC_ID_ADPCM_IMA_OKI,
393 AV_CODEC_ID_ADPCM_DTK,
394 AV_CODEC_ID_ADPCM_IMA_RAD,
395 AV_CODEC_ID_ADPCM_G726LE,
396 AV_CODEC_ID_ADPCM_THP_LE,
397 AV_CODEC_ID_ADPCM_PSX,
400 AV_CODEC_ID_AMR_NB = 0x12000,
403 /* RealAudio codecs*/
404 AV_CODEC_ID_RA_144 = 0x13000,
407 /* various DPCM codecs */
408 AV_CODEC_ID_ROQ_DPCM = 0x14000,
409 AV_CODEC_ID_INTERPLAY_DPCM,
410 AV_CODEC_ID_XAN_DPCM,
411 AV_CODEC_ID_SOL_DPCM,
413 AV_CODEC_ID_SDX2_DPCM = 0x14800,
416 AV_CODEC_ID_MP2 = 0x15000,
417 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
427 AV_CODEC_ID_VMDAUDIO,
433 AV_CODEC_ID_WESTWOOD_SND1,
434 AV_CODEC_ID_GSM, ///< as in Berlin toast format
437 AV_CODEC_ID_TRUESPEECH,
439 AV_CODEC_ID_SMACKAUDIO,
442 AV_CODEC_ID_DSICINAUDIO,
444 AV_CODEC_ID_MUSEPACK7,
446 AV_CODEC_ID_GSM_MS, /* as found in WAV */
452 AV_CODEC_ID_NELLYMOSER,
453 AV_CODEC_ID_MUSEPACK8,
455 AV_CODEC_ID_WMAVOICE,
457 AV_CODEC_ID_WMALOSSLESS,
466 AV_CODEC_ID_BINKAUDIO_RDFT,
467 AV_CODEC_ID_BINKAUDIO_DCT,
468 AV_CODEC_ID_AAC_LATM,
473 AV_CODEC_ID_8SVX_EXP,
474 AV_CODEC_ID_8SVX_FIB,
475 AV_CODEC_ID_BMV_AUDIO,
480 AV_CODEC_ID_COMFORT_NOISE,
482 AV_CODEC_ID_METASOUND,
483 AV_CODEC_ID_PAF_AUDIO,
487 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
489 AV_CODEC_ID_SONIC_LS,
492 AV_CODEC_ID_DSD_LSBF,
493 AV_CODEC_ID_DSD_MSBF,
494 AV_CODEC_ID_DSD_LSBF_PLANAR,
495 AV_CODEC_ID_DSD_MSBF_PLANAR,
498 /* subtitle codecs */
499 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
500 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
501 AV_CODEC_ID_DVB_SUBTITLE,
502 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
505 AV_CODEC_ID_MOV_TEXT,
506 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
507 AV_CODEC_ID_DVB_TELETEXT,
510 AV_CODEC_ID_MICRODVD = 0x17800,
514 AV_CODEC_ID_REALTEXT,
516 AV_CODEC_ID_SUBVIEWER1,
517 AV_CODEC_ID_SUBVIEWER,
524 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
526 /* other specific kind of codecs (generally used for attachments) */
527 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
528 AV_CODEC_ID_TTF = 0x18000,
530 AV_CODEC_ID_BINTEXT = 0x18800,
534 AV_CODEC_ID_SMPTE_KLV,
536 AV_CODEC_ID_TIMED_ID3,
537 AV_CODEC_ID_BIN_DATA,
540 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
542 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
543 * stream (only used by libavformat) */
544 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
545 * stream (only used by libavformat) */
546 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
547 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
551 * This struct describes the properties of a single codec described by an
553 * @see avcodec_descriptor_get()
555 typedef struct AVCodecDescriptor {
557 enum AVMediaType type;
559 * Name of the codec described by this descriptor. It is non-empty and
560 * unique for each codec descriptor. It should contain alphanumeric
561 * characters and '_' only.
565 * A more descriptive name for this codec. May be NULL.
567 const char *long_name;
569 * Codec properties, a combination of AV_CODEC_PROP_* flags.
574 * MIME type(s) associated with the codec.
575 * May be NULL; if not, a NULL-terminated array of MIME types.
576 * The first item is always non-NULL and is the preferred MIME type.
578 const char *const *mime_types;
582 * Codec uses only intra compression.
585 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
587 * Codec supports lossy compression. Audio and video codecs only.
588 * @note a codec may support both lossy and lossless
591 #define AV_CODEC_PROP_LOSSY (1 << 1)
593 * Codec supports lossless compression. Audio and video codecs only.
595 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
597 * Codec supports frame reordering. That is, the coded order (the order in which
598 * the encoded packets are output by the encoders / stored / input to the
599 * decoders) may be different from the presentation order of the corresponding
602 * For codecs that do not have this property set, PTS and DTS should always be
605 #define AV_CODEC_PROP_REORDER (1 << 3)
607 * Subtitle codec is bitmap based
608 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
610 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
612 * Subtitle codec is text based.
613 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
615 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
618 * @ingroup lavc_decoding
619 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
620 * This is mainly needed because some optimized bitstream readers read
621 * 32 or 64 bit at once and could read over the end.<br>
622 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
623 * MPEG bitstreams could cause overread and segfault.
625 #define AV_INPUT_BUFFER_PADDING_SIZE 32
628 * @ingroup lavc_encoding
629 * minimum encoding buffer size
630 * Used to avoid some checks during header writing.
632 #define AV_INPUT_BUFFER_MIN_SIZE 16384
634 #if FF_API_WITHOUT_PREFIX
636 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
638 #define FF_INPUT_BUFFER_PADDING_SIZE 32
641 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
643 #define FF_MIN_BUFFER_SIZE 16384
644 #endif /* FF_API_WITHOUT_PREFIX */
647 * @ingroup lavc_encoding
648 * motion estimation type.
649 * @deprecated use codec private option instead
651 #if FF_API_MOTION_EST
653 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
657 ME_EPZS, ///< enhanced predictive zonal search
658 ME_X1, ///< reserved for experiments
659 ME_HEX, ///< hexagon based search
660 ME_UMH, ///< uneven multi-hexagon search
661 ME_TESA, ///< transformed exhaustive search algorithm
662 ME_ITER=50, ///< iterative search
667 * @ingroup lavc_decoding
670 /* We leave some space between them for extensions (drop some
671 * keyframes for intra-only or drop just some bidir frames). */
672 AVDISCARD_NONE =-16, ///< discard nothing
673 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
674 AVDISCARD_NONREF = 8, ///< discard all non reference
675 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
676 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
677 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
678 AVDISCARD_ALL = 48, ///< discard all
681 enum AVAudioServiceType {
682 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
683 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
684 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
685 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
686 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
687 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
688 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
689 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
690 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
691 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
695 * @ingroup lavc_encoding
697 typedef struct RcOverride{
700 int qscale; // If this is 0 then quality_factor will be used instead.
701 float quality_factor;
704 #if FF_API_MAX_BFRAMES
706 * @deprecated there is no libavcodec-wide limit on the number of B-frames
708 #define FF_MAX_B_FRAMES 16
712 These flags can be passed in AVCodecContext.flags before initialization.
713 Note: Not everything is supported yet.
717 * Allow decoders to produce frames with data planes that are not aligned
718 * to CPU requirements (e.g. due to cropping).
720 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
724 #define AV_CODEC_FLAG_QSCALE (1 << 1)
726 * 4 MV per MB allowed / advanced prediction for H.263.
728 #define AV_CODEC_FLAG_4MV (1 << 2)
730 * Output even those frames that might be corrupted.
732 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
736 #define AV_CODEC_FLAG_QPEL (1 << 4)
738 * Use internal 2pass ratecontrol in first pass mode.
740 #define AV_CODEC_FLAG_PASS1 (1 << 9)
742 * Use internal 2pass ratecontrol in second pass mode.
744 #define AV_CODEC_FLAG_PASS2 (1 << 10)
748 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
750 * Only decode/encode grayscale.
752 #define AV_CODEC_FLAG_GRAY (1 << 13)
754 * error[?] variables will be set during encoding.
756 #define AV_CODEC_FLAG_PSNR (1 << 15)
758 * Input bitstream might be truncated at a random location
759 * instead of only at frame boundaries.
761 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
763 * Use interlaced DCT.
765 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
769 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
771 * Place global headers in extradata instead of every keyframe.
773 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
775 * Use only bitexact stuff (except (I)DCT).
777 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
778 /* Fx : Flag for h263+ extra options */
780 * H.263 advanced intra coding / MPEG-4 AC prediction
782 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
784 * interlaced motion estimation
786 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
788 * Allow non spec compliant speedup tricks.
790 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
792 #define AV_CODEC_FLAG2_FAST (1 << 0)
794 * Skip bitstream encoding.
796 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
798 * Place global headers at every keyframe instead of in extradata.
800 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
803 * timecode is in drop frame format. DEPRECATED!!!!
805 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
808 * Input bitstream might be truncated at a packet boundaries
809 * instead of only at frame boundaries.
811 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
813 * Discard cropping information from SPS.
815 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
818 * Show all frames before the first keyframe
820 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
822 * Export motion vectors through frame side data
824 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
826 * Do not skip samples and export skip information as frame side data
828 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
830 /* Unsupported options :
831 * Syntax Arithmetic coding (SAC)
832 * Reference Picture Selection
833 * Independent Segment Decoding */
835 /* codec capabilities */
838 * Decoder can use draw_horiz_band callback.
840 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
842 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
843 * If not set, it might not use get_buffer() at all or use operations that
844 * assume the buffer was allocated by avcodec_default_get_buffer.
846 #define AV_CODEC_CAP_DR1 (1 << 1)
847 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
849 * Encoder or decoder requires flushing with NULL input at the end in order to
850 * give the complete and correct output.
852 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
853 * with NULL data. The user can still send NULL data to the public encode
854 * or decode function, but libavcodec will not pass it along to the codec
855 * unless this flag is set.
858 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
859 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
863 * The encoder needs to be fed with NULL data at the end of encoding until the
864 * encoder no longer returns data.
866 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
867 * flag also means that the encoder must set the pts and duration for
868 * each output packet. If this flag is not set, the pts and duration will
869 * be determined by libavcodec from the input frame.
871 #define AV_CODEC_CAP_DELAY (1 << 5)
873 * Codec can be fed a final frame with a smaller size.
874 * This can be used to prevent truncation of the last audio samples.
876 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
880 * Codec can export data for HW decoding (VDPAU).
882 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
886 * Codec can output multiple frames per AVPacket
887 * Normally demuxers return one frame at a time, demuxers which do not do
888 * are connected to a parser to split what they return into proper frames.
889 * This flag is reserved to the very rare category of codecs which have a
890 * bitstream that cannot be split into frames without timeconsuming
891 * operations like full decoding. Demuxers carring such bitstreams thus
892 * may return multiple frames in a packet. This has many disadvantages like
893 * prohibiting stream copy in many cases thus it should only be considered
896 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
898 * Codec is experimental and is thus avoided in favor of non experimental
901 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
903 * Codec should fill in channel configuration and samplerate instead of container
905 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
907 * Codec supports frame-level multithreading.
909 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
911 * Codec supports slice-based (or partition-based) multithreading.
913 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
915 * Codec supports changed parameters at any point.
917 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
919 * Codec supports avctx->thread_count == 0 (auto).
921 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
923 * Audio encoder supports receiving a different number of samples in each call.
925 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
927 * Codec is intra only.
929 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
933 #define AV_CODEC_CAP_LOSSLESS 0x80000000
936 #if FF_API_WITHOUT_PREFIX
938 * Allow decoders to produce frames with data planes that are not aligned
939 * to CPU requirements (e.g. due to cropping).
941 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
942 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
943 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
944 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
945 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
948 * @deprecated use the "gmc" private option of the libxvid encoder
950 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
954 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
957 #define CODEC_FLAG_MV0 0x0040
959 #if FF_API_INPUT_PRESERVED
961 * @deprecated passing reference-counted frames to the encoders replaces this
964 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
966 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
967 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
968 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
971 * @deprecated edges are not used/required anymore. I.e. this flag is now always
974 #define CODEC_FLAG_EMU_EDGE 0x4000
976 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
977 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
979 #if FF_API_NORMALIZE_AQP
981 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
984 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
986 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
987 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
988 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
989 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
990 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
991 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
992 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
993 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
994 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
995 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
996 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
997 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
998 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1000 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1001 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1002 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1003 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1005 /* Unsupported options :
1006 * Syntax Arithmetic coding (SAC)
1007 * Reference Picture Selection
1008 * Independent Segment Decoding */
1010 /* codec capabilities */
1012 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1014 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1015 * If not set, it might not use get_buffer() at all or use operations that
1016 * assume the buffer was allocated by avcodec_default_get_buffer.
1018 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1019 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1021 /* Codec can export data for HW decoding. This flag indicates that
1022 * the codec would call get_format() with list that might contain HW accelerated
1023 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1024 * including raw image format.
1025 * The application can use the passed context to determine bitstream version,
1026 * chroma format, resolution etc.
1028 #define CODEC_CAP_HWACCEL 0x0010
1029 #endif /* FF_API_XVMC */
1031 * Encoder or decoder requires flushing with NULL input at the end in order to
1032 * give the complete and correct output.
1034 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1035 * with NULL data. The user can still send NULL data to the public encode
1036 * or decode function, but libavcodec will not pass it along to the codec
1037 * unless this flag is set.
1040 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1041 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1045 * The encoder needs to be fed with NULL data at the end of encoding until the
1046 * encoder no longer returns data.
1048 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1049 * flag also means that the encoder must set the pts and duration for
1050 * each output packet. If this flag is not set, the pts and duration will
1051 * be determined by libavcodec from the input frame.
1053 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1055 * Codec can be fed a final frame with a smaller size.
1056 * This can be used to prevent truncation of the last audio samples.
1058 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1059 #if FF_API_CAP_VDPAU
1061 * Codec can export data for HW decoding (VDPAU).
1063 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1066 * Codec can output multiple frames per AVPacket
1067 * Normally demuxers return one frame at a time, demuxers which do not do
1068 * are connected to a parser to split what they return into proper frames.
1069 * This flag is reserved to the very rare category of codecs which have a
1070 * bitstream that cannot be split into frames without timeconsuming
1071 * operations like full decoding. Demuxers carring such bitstreams thus
1072 * may return multiple frames in a packet. This has many disadvantages like
1073 * prohibiting stream copy in many cases thus it should only be considered
1076 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1078 * Codec is experimental and is thus avoided in favor of non experimental
1081 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1083 * Codec should fill in channel configuration and samplerate instead of container
1085 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1086 #if FF_API_NEG_LINESIZES
1088 * @deprecated no codecs use this capability
1090 #define CODEC_CAP_NEG_LINESIZES 0x0800
1093 * Codec supports frame-level multithreading.
1095 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1097 * Codec supports slice-based (or partition-based) multithreading.
1099 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1101 * Codec supports changed parameters at any point.
1103 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1105 * Codec supports avctx->thread_count == 0 (auto).
1107 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1109 * Audio encoder supports receiving a different number of samples in each call.
1111 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1113 * Codec is intra only.
1115 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1117 * Codec is lossless.
1119 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1122 * HWAccel is experimental and is thus avoided in favor of non experimental
1125 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1126 #endif /* FF_API_WITHOUT_PREFIX */
1129 //The following defines may change, don't expect compatibility if you use them.
1130 #define MB_TYPE_INTRA4x4 0x0001
1131 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1132 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1133 #define MB_TYPE_16x16 0x0008
1134 #define MB_TYPE_16x8 0x0010
1135 #define MB_TYPE_8x16 0x0020
1136 #define MB_TYPE_8x8 0x0040
1137 #define MB_TYPE_INTERLACED 0x0080
1138 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1139 #define MB_TYPE_ACPRED 0x0200
1140 #define MB_TYPE_GMC 0x0400
1141 #define MB_TYPE_SKIP 0x0800
1142 #define MB_TYPE_P0L0 0x1000
1143 #define MB_TYPE_P1L0 0x2000
1144 #define MB_TYPE_P0L1 0x4000
1145 #define MB_TYPE_P1L1 0x8000
1146 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1147 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1148 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1149 #define MB_TYPE_QUANT 0x00010000
1150 #define MB_TYPE_CBP 0x00020000
1151 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1156 * This specifies the area which should be displayed.
1157 * Note there may be multiple such areas for one frame.
1159 typedef struct AVPanScan{
1162 * - encoding: Set by user.
1163 * - decoding: Set by libavcodec.
1168 * width and height in 1/16 pel
1169 * - encoding: Set by user.
1170 * - decoding: Set by libavcodec.
1176 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1177 * - encoding: Set by user.
1178 * - decoding: Set by libavcodec.
1180 int16_t position[3][2];
1183 #if FF_API_QSCALE_TYPE
1184 #define FF_QSCALE_TYPE_MPEG1 0
1185 #define FF_QSCALE_TYPE_MPEG2 1
1186 #define FF_QSCALE_TYPE_H264 2
1187 #define FF_QSCALE_TYPE_VP56 3
1191 * The decoder will keep a reference to the frame and may reuse it later.
1193 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1196 * @defgroup lavc_packet AVPacket
1198 * Types and functions for working with AVPacket.
1201 enum AVPacketSideDataType {
1202 AV_PKT_DATA_PALETTE,
1203 AV_PKT_DATA_NEW_EXTRADATA,
1206 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1209 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1210 * s32le channel_count
1211 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1212 * u64le channel_layout
1213 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1215 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1220 AV_PKT_DATA_PARAM_CHANGE,
1223 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1224 * structures with info about macroblocks relevant to splitting the
1225 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1226 * That is, it does not necessarily contain info about all macroblocks,
1227 * as long as the distance between macroblocks in the info is smaller
1228 * than the target payload size.
1229 * Each MB info structure is 12 bytes, and is laid out as follows:
1231 * u32le bit offset from the start of the packet
1232 * u8 current quantizer at the start of the macroblock
1234 * u16le macroblock address within the GOB
1235 * u8 horizontal MV predictor
1236 * u8 vertical MV predictor
1237 * u8 horizontal MV predictor for block number 3
1238 * u8 vertical MV predictor for block number 3
1241 AV_PKT_DATA_H263_MB_INFO,
1244 * This side data should be associated with an audio stream and contains
1245 * ReplayGain information in form of the AVReplayGain struct.
1247 AV_PKT_DATA_REPLAYGAIN,
1250 * This side data contains a 3x3 transformation matrix describing an affine
1251 * transformation that needs to be applied to the decoded video frames for
1252 * correct presentation.
1254 * See libavutil/display.h for a detailed description of the data.
1256 AV_PKT_DATA_DISPLAYMATRIX,
1259 * This side data should be associated with a video stream and contains
1260 * Stereoscopic 3D information in form of the AVStereo3D struct.
1262 AV_PKT_DATA_STEREO3D,
1265 * This side data should be associated with an audio stream and corresponds
1266 * to enum AVAudioServiceType.
1268 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1271 * This side data contains quality related information from the encoder.
1273 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1277 * u64le[error count] sum of squared differences between encoder in and output
1280 AV_PKT_DATA_QUALITY_STATS,
1283 * Recommmends skipping the specified number of samples
1285 * u32le number of samples to skip from start of this packet
1286 * u32le number of samples to skip from end of this packet
1287 * u8 reason for start skip
1288 * u8 reason for end skip (0=padding silence, 1=convergence)
1291 AV_PKT_DATA_SKIP_SAMPLES=70,
1294 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1295 * the packet may contain "dual mono" audio specific to Japanese DTV
1296 * and if it is true, recommends only the selected channel to be used.
1298 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1301 AV_PKT_DATA_JP_DUALMONO,
1304 * A list of zero terminated key/value strings. There is no end marker for
1305 * the list, so it is required to rely on the side data size to stop.
1307 AV_PKT_DATA_STRINGS_METADATA,
1310 * Subtitle event position
1318 AV_PKT_DATA_SUBTITLE_POSITION,
1321 * Data found in BlockAdditional element of matroska container. There is
1322 * no end marker for the data, so it is required to rely on the side data
1323 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1326 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1329 * The optional first identifier line of a WebVTT cue.
1331 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1334 * The optional settings (rendering instructions) that immediately
1335 * follow the timestamp specifier of a WebVTT cue.
1337 AV_PKT_DATA_WEBVTT_SETTINGS,
1340 * A list of zero terminated key/value strings. There is no end marker for
1341 * the list, so it is required to rely on the side data size to stop. This
1342 * side data includes updated metadata which appeared in the stream.
1344 AV_PKT_DATA_METADATA_UPDATE,
1347 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1349 typedef struct AVPacketSideData {
1352 enum AVPacketSideDataType type;
1356 * This structure stores compressed data. It is typically exported by demuxers
1357 * and then passed as input to decoders, or received as output from encoders and
1358 * then passed to muxers.
1360 * For video, it should typically contain one compressed frame. For audio it may
1361 * contain several compressed frames. Encoders are allowed to output empty
1362 * packets, with no compressed data, containing only side data
1363 * (e.g. to update some stream parameters at the end of encoding).
1365 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1366 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1367 * without libavcodec and libavformat major bump.
1369 * The semantics of data ownership depends on the buf or destruct (deprecated)
1370 * fields. If either is set, the packet data is dynamically allocated and is
1371 * valid indefinitely until av_free_packet() is called (which in turn calls
1372 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1373 * the packet data is typically backed by some static buffer somewhere and is
1374 * only valid for a limited time (e.g. until the next read call when demuxing).
1376 * The side data is always allocated with av_malloc() and is freed in
1379 typedef struct AVPacket {
1381 * A reference to the reference-counted buffer where the packet data is
1383 * May be NULL, then the packet data is not reference-counted.
1387 * Presentation timestamp in AVStream->time_base units; the time at which
1388 * the decompressed packet will be presented to the user.
1389 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1390 * pts MUST be larger or equal to dts as presentation cannot happen before
1391 * decompression, unless one wants to view hex dumps. Some formats misuse
1392 * the terms dts and pts/cts to mean something different. Such timestamps
1393 * must be converted to true pts/dts before they are stored in AVPacket.
1397 * Decompression timestamp in AVStream->time_base units; the time at which
1398 * the packet is decompressed.
1399 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1406 * A combination of AV_PKT_FLAG values
1410 * Additional packet data that can be provided by the container.
1411 * Packet can contain several types of side information.
1413 AVPacketSideData *side_data;
1414 int side_data_elems;
1417 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1418 * Equals next_pts - this_pts in presentation order.
1422 int64_t pos; ///< byte position in stream, -1 if unknown
1424 #if FF_API_CONVERGENCE_DURATION
1426 * @deprecated Same as the duration field, but as int64_t. This was required
1427 * for Matroska subtitles, whose duration values could overflow when the
1428 * duration field was still an int.
1430 attribute_deprecated
1431 int64_t convergence_duration;
1434 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1435 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1437 enum AVSideDataParamChangeFlags {
1438 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1439 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1440 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1441 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1447 struct AVCodecInternal;
1451 AV_FIELD_PROGRESSIVE,
1452 AV_FIELD_TT, //< Top coded_first, top displayed first
1453 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1454 AV_FIELD_TB, //< Top coded first, bottom displayed first
1455 AV_FIELD_BT, //< Bottom coded first, top displayed first
1459 * main external API structure.
1460 * New fields can be added to the end with minor version bumps.
1461 * Removal, reordering and changes to existing fields require a major
1463 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1465 * sizeof(AVCodecContext) must not be used outside libav*.
1467 typedef struct AVCodecContext {
1469 * information on struct for av_log
1470 * - set by avcodec_alloc_context3
1472 const AVClass *av_class;
1473 int log_level_offset;
1475 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1476 const struct AVCodec *codec;
1477 #if FF_API_CODEC_NAME
1479 * @deprecated this field is not used for anything in libavcodec
1481 attribute_deprecated
1482 char codec_name[32];
1484 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1487 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1488 * This is used to work around some encoder bugs.
1489 * A demuxer should set this to what is stored in the field used to identify the codec.
1490 * If there are multiple such fields in a container then the demuxer should choose the one
1491 * which maximizes the information about the used codec.
1492 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1493 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1494 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1496 * - encoding: Set by user, if not then the default based on codec_id will be used.
1497 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1499 unsigned int codec_tag;
1501 #if FF_API_STREAM_CODEC_TAG
1503 * @deprecated this field is unused
1505 attribute_deprecated
1506 unsigned int stream_codec_tag;
1512 * Private context used for internal data.
1514 * Unlike priv_data, this is not codec-specific. It is used in general
1515 * libavcodec functions.
1517 struct AVCodecInternal *internal;
1520 * Private data of the user, can be used to carry app specific stuff.
1521 * - encoding: Set by user.
1522 * - decoding: Set by user.
1527 * the average bitrate
1528 * - encoding: Set by user; unused for constant quantizer encoding.
1529 * - decoding: Set by user, may be overwritten by libavcodec
1530 * if this info is available in the stream
1535 * number of bits the bitstream is allowed to diverge from the reference.
1536 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1537 * - encoding: Set by user; unused for constant quantizer encoding.
1538 * - decoding: unused
1540 int bit_rate_tolerance;
1543 * Global quality for codecs which cannot change it per frame.
1544 * This should be proportional to MPEG-1/2/4 qscale.
1545 * - encoding: Set by user.
1546 * - decoding: unused
1551 * - encoding: Set by user.
1552 * - decoding: unused
1554 int compression_level;
1555 #define FF_COMPRESSION_DEFAULT -1
1559 * - encoding: Set by user.
1560 * - decoding: Set by user.
1566 * - encoding: Set by user.
1567 * - decoding: Set by user.
1572 * some codecs need / can use extradata like Huffman tables.
1573 * mjpeg: Huffman tables
1574 * rv10: additional flags
1575 * mpeg4: global headers (they can be in the bitstream or here)
1576 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1577 * than extradata_size to avoid problems if it is read with the bitstream reader.
1578 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1579 * - encoding: Set/allocated/freed by libavcodec.
1580 * - decoding: Set/allocated/freed by user.
1586 * This is the fundamental unit of time (in seconds) in terms
1587 * of which frame timestamps are represented. For fixed-fps content,
1588 * timebase should be 1/framerate and timestamp increments should be
1590 * This often, but not always is the inverse of the frame rate or field rate
1592 * - encoding: MUST be set by user.
1593 * - decoding: the use of this field for decoding is deprecated.
1594 * Use framerate instead.
1596 AVRational time_base;
1599 * For some codecs, the time base is closer to the field rate than the frame rate.
1600 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1601 * if no telecine is used ...
1603 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1605 int ticks_per_frame;
1610 * Encoding: Number of frames delay there will be from the encoder input to
1611 * the decoder output. (we assume the decoder matches the spec)
1612 * Decoding: Number of frames delay in addition to what a standard decoder
1613 * as specified in the spec would produce.
1616 * Number of frames the decoded output will be delayed relative to the
1620 * For encoding, this field is unused (see initial_padding).
1622 * For decoding, this is the number of samples the decoder needs to
1623 * output before the decoder's output is valid. When seeking, you should
1624 * start decoding this many samples prior to your desired seek point.
1626 * - encoding: Set by libavcodec.
1627 * - decoding: Set by libavcodec.
1634 * picture width / height.
1636 * @note Those fields may not match the values of the last
1637 * AVFrame outputted by avcodec_decode_video2 due frame
1640 * - encoding: MUST be set by user.
1641 * - decoding: May be set by the user before opening the decoder if known e.g.
1642 * from the container. Some decoders will require the dimensions
1643 * to be set by the caller. During decoding, the decoder may
1644 * overwrite those values as required while parsing the data.
1649 * Bitstream width / height, may be different from width/height e.g. when
1650 * the decoded frame is cropped before being output or lowres is enabled.
1652 * @note Those field may not match the value of the last
1653 * AVFrame outputted by avcodec_decode_video2 due frame
1656 * - encoding: unused
1657 * - decoding: May be set by the user before opening the decoder if known
1658 * e.g. from the container. During decoding, the decoder may
1659 * overwrite those values as required while parsing the data.
1661 int coded_width, coded_height;
1663 #if FF_API_ASPECT_EXTENDED
1664 #define FF_ASPECT_EXTENDED 15
1668 * the number of pictures in a group of pictures, or 0 for intra_only
1669 * - encoding: Set by user.
1670 * - decoding: unused
1675 * Pixel format, see AV_PIX_FMT_xxx.
1676 * May be set by the demuxer if known from headers.
1677 * May be overridden by the decoder if it knows better.
1679 * @note This field may not match the value of the last
1680 * AVFrame outputted by avcodec_decode_video2 due frame
1683 * - encoding: Set by user.
1684 * - decoding: Set by user if known, overridden by libavcodec while
1687 enum AVPixelFormat pix_fmt;
1689 #if FF_API_MOTION_EST
1691 * This option does nothing
1692 * @deprecated use codec private options instead
1694 attribute_deprecated int me_method;
1698 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1699 * decoder to draw a horizontal band. It improves cache usage. Not
1700 * all codecs can do that. You must check the codec capabilities
1702 * When multithreading is used, it may be called from multiple threads
1703 * at the same time; threads might draw different parts of the same AVFrame,
1704 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1706 * The function is also used by hardware acceleration APIs.
1707 * It is called at least once during frame decoding to pass
1708 * the data needed for hardware render.
1709 * In that mode instead of pixel data, AVFrame points to
1710 * a structure specific to the acceleration API. The application
1711 * reads the structure and can change some fields to indicate progress
1713 * - encoding: unused
1714 * - decoding: Set by user.
1715 * @param height the height of the slice
1716 * @param y the y position of the slice
1717 * @param type 1->top field, 2->bottom field, 3->frame
1718 * @param offset offset into the AVFrame.data from which the slice should be read
1720 void (*draw_horiz_band)(struct AVCodecContext *s,
1721 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1722 int y, int type, int height);
1725 * callback to negotiate the pixelFormat
1726 * @param fmt is the list of formats which are supported by the codec,
1727 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1728 * The first is always the native one.
1729 * @note The callback may be called again immediately if initialization for
1730 * the selected (hardware-accelerated) pixel format failed.
1731 * @warning Behavior is undefined if the callback returns a value not
1732 * in the fmt list of formats.
1733 * @return the chosen format
1734 * - encoding: unused
1735 * - decoding: Set by user, if not set the native format will be chosen.
1737 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1740 * maximum number of B-frames between non-B-frames
1741 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1742 * - encoding: Set by user.
1743 * - decoding: unused
1748 * qscale factor between IP and B-frames
1749 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1750 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1751 * - encoding: Set by user.
1752 * - decoding: unused
1754 float b_quant_factor;
1756 #if FF_API_RC_STRATEGY
1757 /** @deprecated use codec private option instead */
1758 attribute_deprecated int rc_strategy;
1759 #define FF_RC_STRATEGY_XVID 1
1762 int b_frame_strategy;
1765 * qscale offset between IP and B-frames
1766 * - encoding: Set by user.
1767 * - decoding: unused
1769 float b_quant_offset;
1772 * Size of the frame reordering buffer in the decoder.
1773 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1774 * - encoding: Set by libavcodec.
1775 * - decoding: Set by libavcodec.
1780 * 0-> h263 quant 1-> mpeg quant
1781 * - encoding: Set by user.
1782 * - decoding: unused
1787 * qscale factor between P and I-frames
1788 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1789 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1790 * - encoding: Set by user.
1791 * - decoding: unused
1793 float i_quant_factor;
1796 * qscale offset between P and I-frames
1797 * - encoding: Set by user.
1798 * - decoding: unused
1800 float i_quant_offset;
1803 * luminance masking (0-> disabled)
1804 * - encoding: Set by user.
1805 * - decoding: unused
1810 * temporary complexity masking (0-> disabled)
1811 * - encoding: Set by user.
1812 * - decoding: unused
1814 float temporal_cplx_masking;
1817 * spatial complexity masking (0-> disabled)
1818 * - encoding: Set by user.
1819 * - decoding: unused
1821 float spatial_cplx_masking;
1824 * p block masking (0-> disabled)
1825 * - encoding: Set by user.
1826 * - decoding: unused
1831 * darkness masking (0-> disabled)
1832 * - encoding: Set by user.
1833 * - decoding: unused
1839 * - encoding: Set by libavcodec.
1840 * - decoding: Set by user (or 0).
1844 * prediction method (needed for huffyuv)
1845 * - encoding: Set by user.
1846 * - decoding: unused
1848 int prediction_method;
1849 #define FF_PRED_LEFT 0
1850 #define FF_PRED_PLANE 1
1851 #define FF_PRED_MEDIAN 2
1854 * slice offsets in the frame in bytes
1855 * - encoding: Set/allocated by libavcodec.
1856 * - decoding: Set/allocated by user (or NULL).
1861 * sample aspect ratio (0 if unknown)
1862 * That is the width of a pixel divided by the height of the pixel.
1863 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1864 * - encoding: Set by user.
1865 * - decoding: Set by libavcodec.
1867 AVRational sample_aspect_ratio;
1870 * motion estimation comparison function
1871 * - encoding: Set by user.
1872 * - decoding: unused
1876 * subpixel motion estimation comparison function
1877 * - encoding: Set by user.
1878 * - decoding: unused
1882 * macroblock comparison function (not supported yet)
1883 * - encoding: Set by user.
1884 * - decoding: unused
1888 * interlaced DCT comparison function
1889 * - encoding: Set by user.
1890 * - decoding: unused
1893 #define FF_CMP_SAD 0
1894 #define FF_CMP_SSE 1
1895 #define FF_CMP_SATD 2
1896 #define FF_CMP_DCT 3
1897 #define FF_CMP_PSNR 4
1898 #define FF_CMP_BIT 5
1900 #define FF_CMP_ZERO 7
1901 #define FF_CMP_VSAD 8
1902 #define FF_CMP_VSSE 9
1903 #define FF_CMP_NSSE 10
1904 #define FF_CMP_W53 11
1905 #define FF_CMP_W97 12
1906 #define FF_CMP_DCTMAX 13
1907 #define FF_CMP_DCT264 14
1908 #define FF_CMP_CHROMA 256
1911 * ME diamond size & shape
1912 * - encoding: Set by user.
1913 * - decoding: unused
1918 * amount of previous MV predictors (2a+1 x 2a+1 square)
1919 * - encoding: Set by user.
1920 * - decoding: unused
1922 int last_predictor_count;
1925 * prepass for motion estimation
1926 * - encoding: Set by user.
1927 * - decoding: unused
1932 * motion estimation prepass comparison function
1933 * - encoding: Set by user.
1934 * - decoding: unused
1939 * ME prepass diamond size & shape
1940 * - encoding: Set by user.
1941 * - decoding: unused
1947 * - encoding: Set by user.
1948 * - decoding: unused
1950 int me_subpel_quality;
1954 * DTG active format information (additional aspect ratio
1955 * information only used in DVB MPEG-2 transport streams)
1958 * - encoding: unused
1959 * - decoding: Set by decoder.
1960 * @deprecated Deprecated in favor of AVSideData
1962 attribute_deprecated int dtg_active_format;
1963 #define FF_DTG_AFD_SAME 8
1964 #define FF_DTG_AFD_4_3 9
1965 #define FF_DTG_AFD_16_9 10
1966 #define FF_DTG_AFD_14_9 11
1967 #define FF_DTG_AFD_4_3_SP_14_9 13
1968 #define FF_DTG_AFD_16_9_SP_14_9 14
1969 #define FF_DTG_AFD_SP_4_3 15
1970 #endif /* FF_API_AFD */
1973 * maximum motion estimation search range in subpel units
1974 * If 0 then no limit.
1976 * - encoding: Set by user.
1977 * - decoding: unused
1981 #if FF_API_QUANT_BIAS
1983 * @deprecated use encoder private option instead
1985 attribute_deprecated int intra_quant_bias;
1986 #define FF_DEFAULT_QUANT_BIAS 999999
1989 * @deprecated use encoder private option instead
1991 attribute_deprecated int inter_quant_bias;
1996 * - encoding: unused
1997 * - decoding: Set by user.
2000 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2001 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2002 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2006 * XVideo Motion Acceleration
2007 * - encoding: forbidden
2008 * - decoding: set by decoder
2009 * @deprecated XvMC doesn't need it anymore.
2011 attribute_deprecated int xvmc_acceleration;
2012 #endif /* FF_API_XVMC */
2015 * macroblock decision mode
2016 * - encoding: Set by user.
2017 * - decoding: unused
2020 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2021 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2022 #define FF_MB_DECISION_RD 2 ///< rate distortion
2025 * custom intra quantization matrix
2026 * - encoding: Set by user, can be NULL.
2027 * - decoding: Set by libavcodec.
2029 uint16_t *intra_matrix;
2032 * custom inter quantization matrix
2033 * - encoding: Set by user, can be NULL.
2034 * - decoding: Set by libavcodec.
2036 uint16_t *inter_matrix;
2039 * scene change detection threshold
2040 * 0 is default, larger means fewer detected scene changes.
2041 * - encoding: Set by user.
2042 * - decoding: unused
2044 int scenechange_threshold;
2047 * noise reduction strength
2048 * - encoding: Set by user.
2049 * - decoding: unused
2051 int noise_reduction;
2055 * @deprecated this field is unused
2057 attribute_deprecated
2061 * @deprecated this field is unused
2063 attribute_deprecated
2068 * precision of the intra DC coefficient - 8
2069 * - encoding: Set by user.
2070 * - decoding: Set by libavcodec
2072 int intra_dc_precision;
2075 * Number of macroblock rows at the top which are skipped.
2076 * - encoding: unused
2077 * - decoding: Set by user.
2082 * Number of macroblock rows at the bottom which are skipped.
2083 * - encoding: unused
2084 * - decoding: Set by user.
2090 * @deprecated use encoder private options instead
2092 attribute_deprecated
2093 float border_masking;
2097 * minimum MB lagrange multipler
2098 * - encoding: Set by user.
2099 * - decoding: unused
2104 * maximum MB lagrange multipler
2105 * - encoding: Set by user.
2106 * - decoding: unused
2112 * - encoding: Set by user.
2113 * - decoding: unused
2115 int me_penalty_compensation;
2119 * - encoding: Set by user.
2120 * - decoding: unused
2126 * - encoding: Set by user.
2127 * - decoding: unused
2133 * - encoding: Set by user.
2134 * - decoding: unused
2139 * number of reference frames
2140 * - encoding: Set by user.
2141 * - decoding: Set by lavc.
2146 * chroma qp offset from luma
2147 * - encoding: Set by user.
2148 * - decoding: unused
2152 #if FF_API_UNUSED_MEMBERS
2154 * Multiplied by qscale for each frame and added to scene_change_score.
2155 * - encoding: Set by user.
2156 * - decoding: unused
2158 attribute_deprecated int scenechange_factor;
2163 * Note: Value depends upon the compare function used for fullpel ME.
2164 * - encoding: Set by user.
2165 * - decoding: unused
2170 * Adjust sensitivity of b_frame_strategy 1.
2171 * - encoding: Set by user.
2172 * - decoding: unused
2177 * Chromaticity coordinates of the source primaries.
2178 * - encoding: Set by user
2179 * - decoding: Set by libavcodec
2181 enum AVColorPrimaries color_primaries;
2184 * Color Transfer Characteristic.
2185 * - encoding: Set by user
2186 * - decoding: Set by libavcodec
2188 enum AVColorTransferCharacteristic color_trc;
2191 * YUV colorspace type.
2192 * - encoding: Set by user
2193 * - decoding: Set by libavcodec
2195 enum AVColorSpace colorspace;
2198 * MPEG vs JPEG YUV range.
2199 * - encoding: Set by user
2200 * - decoding: Set by libavcodec
2202 enum AVColorRange color_range;
2205 * This defines the location of chroma samples.
2206 * - encoding: Set by user
2207 * - decoding: Set by libavcodec
2209 enum AVChromaLocation chroma_sample_location;
2213 * Indicates number of picture subdivisions. Used for parallelized
2215 * - encoding: Set by user
2216 * - decoding: unused
2221 * - encoding: set by libavcodec
2222 * - decoding: Set by user.
2224 enum AVFieldOrder field_order;
2227 int sample_rate; ///< samples per second
2228 int channels; ///< number of audio channels
2231 * audio sample format
2232 * - encoding: Set by user.
2233 * - decoding: Set by libavcodec.
2235 enum AVSampleFormat sample_fmt; ///< sample format
2237 /* The following data should not be initialized. */
2239 * Number of samples per channel in an audio frame.
2241 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2242 * except the last must contain exactly frame_size samples per channel.
2243 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2244 * frame size is not restricted.
2245 * - decoding: may be set by some decoders to indicate constant frame size
2250 * Frame counter, set by libavcodec.
2252 * - decoding: total number of frames returned from the decoder so far.
2253 * - encoding: total number of frames passed to the encoder so far.
2255 * @note the counter is not incremented if encoding/decoding resulted in
2261 * number of bytes per packet if constant and known or 0
2262 * Used by some WAV based audio codecs.
2267 * Audio cutoff bandwidth (0 means "automatic")
2268 * - encoding: Set by user.
2269 * - decoding: unused
2274 * Audio channel layout.
2275 * - encoding: set by user.
2276 * - decoding: set by user, may be overwritten by libavcodec.
2278 uint64_t channel_layout;
2281 * Request decoder to use this channel layout if it can (0 for default)
2282 * - encoding: unused
2283 * - decoding: Set by user.
2285 uint64_t request_channel_layout;
2288 * Type of service that the audio stream conveys.
2289 * - encoding: Set by user.
2290 * - decoding: Set by libavcodec.
2292 enum AVAudioServiceType audio_service_type;
2295 * desired sample format
2296 * - encoding: Not used.
2297 * - decoding: Set by user.
2298 * Decoder will decode to this format if it can.
2300 enum AVSampleFormat request_sample_fmt;
2303 * This callback is called at the beginning of each frame to get data
2304 * buffer(s) for it. There may be one contiguous buffer for all the data or
2305 * there may be a buffer per each data plane or anything in between. What
2306 * this means is, you may set however many entries in buf[] you feel necessary.
2307 * Each buffer must be reference-counted using the AVBuffer API (see description
2310 * The following fields will be set in the frame before this callback is
2313 * - width, height (video only)
2314 * - sample_rate, channel_layout, nb_samples (audio only)
2315 * Their values may differ from the corresponding values in
2316 * AVCodecContext. This callback must use the frame values, not the codec
2317 * context values, to calculate the required buffer size.
2319 * This callback must fill the following fields in the frame:
2323 * * if the data is planar audio with more than 8 channels, then this
2324 * callback must allocate and fill extended_data to contain all pointers
2325 * to all data planes. data[] must hold as many pointers as it can.
2326 * extended_data must be allocated with av_malloc() and will be freed in
2328 * * otherwise exended_data must point to data
2329 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2330 * the frame's data and extended_data pointers must be contained in these. That
2331 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2332 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2333 * and av_buffer_ref().
2334 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2335 * this callback and filled with the extra buffers if there are more
2336 * buffers than buf[] can hold. extended_buf will be freed in
2339 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2340 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2343 * Each data plane must be aligned to the maximum required by the target
2346 * @see avcodec_default_get_buffer2()
2350 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2351 * (read and/or written to if it is writable) later by libavcodec.
2353 * avcodec_align_dimensions2() should be used to find the required width and
2354 * height, as they normally need to be rounded up to the next multiple of 16.
2356 * Some decoders do not support linesizes changing between frames.
2358 * If frame multithreading is used and thread_safe_callbacks is set,
2359 * this callback may be called from a different thread, but not from more
2360 * than one at once. Does not need to be reentrant.
2362 * @see avcodec_align_dimensions2()
2366 * Decoders request a buffer of a particular size by setting
2367 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2368 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2369 * to a smaller value in the output frame.
2371 * As a convenience, av_samples_get_buffer_size() and
2372 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2373 * functions to find the required data size and to fill data pointers and
2374 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2375 * since all planes must be the same size.
2377 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2379 * - encoding: unused
2380 * - decoding: Set by libavcodec, user can override.
2382 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2385 * If non-zero, the decoded audio and video frames returned from
2386 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2387 * and are valid indefinitely. The caller must free them with
2388 * av_frame_unref() when they are not needed anymore.
2389 * Otherwise, the decoded frames must not be freed by the caller and are
2390 * only valid until the next decode call.
2392 * - encoding: unused
2393 * - decoding: set by the caller before avcodec_open2().
2395 int refcounted_frames;
2397 /* - encoding parameters */
2398 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2399 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2403 * - encoding: Set by user.
2404 * - decoding: unused
2410 * - encoding: Set by user.
2411 * - decoding: unused
2416 * maximum quantizer difference between frames
2417 * - encoding: Set by user.
2418 * - decoding: unused
2424 * @deprecated use encoder private options instead
2426 attribute_deprecated
2429 attribute_deprecated
2431 attribute_deprecated
2436 * decoder bitstream buffer size
2437 * - encoding: Set by user.
2438 * - decoding: unused
2443 * ratecontrol override, see RcOverride
2444 * - encoding: Allocated/set/freed by user.
2445 * - decoding: unused
2447 int rc_override_count;
2448 RcOverride *rc_override;
2452 * @deprecated use encoder private options instead
2454 attribute_deprecated
2460 * - encoding: Set by user.
2461 * - decoding: Set by user, may be overwritten by libavcodec.
2463 int64_t rc_max_rate;
2467 * - encoding: Set by user.
2468 * - decoding: unused
2470 int64_t rc_min_rate;
2474 * @deprecated use encoder private options instead
2476 attribute_deprecated
2477 float rc_buffer_aggressivity;
2479 attribute_deprecated
2480 float rc_initial_cplx;
2484 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2485 * - encoding: Set by user.
2486 * - decoding: unused.
2488 float rc_max_available_vbv_use;
2491 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2492 * - encoding: Set by user.
2493 * - decoding: unused.
2495 float rc_min_vbv_overflow_use;
2498 * Number of bits which should be loaded into the rc buffer before decoding starts.
2499 * - encoding: Set by user.
2500 * - decoding: unused
2502 int rc_initial_buffer_occupancy;
2504 #define FF_CODER_TYPE_VLC 0
2505 #define FF_CODER_TYPE_AC 1
2506 #define FF_CODER_TYPE_RAW 2
2507 #define FF_CODER_TYPE_RLE 3
2508 #if FF_API_UNUSED_MEMBERS
2509 #define FF_CODER_TYPE_DEFLATE 4
2510 #endif /* FF_API_UNUSED_MEMBERS */
2513 * - encoding: Set by user.
2514 * - decoding: unused
2520 * - encoding: Set by user.
2521 * - decoding: unused
2527 * @deprecated use encoder private options instead
2529 attribute_deprecated
2533 * @deprecated use encoder private options instead
2535 attribute_deprecated
2540 * frame skip threshold
2541 * - encoding: Set by user.
2542 * - decoding: unused
2544 int frame_skip_threshold;
2548 * - encoding: Set by user.
2549 * - decoding: unused
2551 int frame_skip_factor;
2554 * frame skip exponent
2555 * - encoding: Set by user.
2556 * - decoding: unused
2561 * frame skip comparison function
2562 * - encoding: Set by user.
2563 * - decoding: unused
2568 * trellis RD quantization
2569 * - encoding: Set by user.
2570 * - decoding: unused
2575 * - encoding: Set by user.
2576 * - decoding: unused
2578 int min_prediction_order;
2581 * - encoding: Set by user.
2582 * - decoding: unused
2584 int max_prediction_order;
2587 * GOP timecode frame start number
2588 * - encoding: Set by user, in non drop frame format
2589 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2591 int64_t timecode_frame_start;
2593 /* The RTP callback: This function is called */
2594 /* every time the encoder has a packet to send. */
2595 /* It depends on the encoder if the data starts */
2596 /* with a Start Code (it should). H.263 does. */
2597 /* mb_nb contains the number of macroblocks */
2598 /* encoded in the RTP payload. */
2599 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2601 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2602 /* do its best to deliver a chunk with size */
2603 /* below rtp_payload_size, the chunk will start */
2604 /* with a start code on some codecs like H.263. */
2605 /* This doesn't take account of any particular */
2606 /* headers inside the transmitted RTP payload. */
2608 /* statistics, used for 2-pass encoding */
2619 * number of bits used for the previously encoded frame
2620 * - encoding: Set by libavcodec.
2621 * - decoding: unused
2626 * pass1 encoding statistics output buffer
2627 * - encoding: Set by libavcodec.
2628 * - decoding: unused
2633 * pass2 encoding statistics input buffer
2634 * Concatenated stuff from stats_out of pass1 should be placed here.
2635 * - encoding: Allocated/set/freed by user.
2636 * - decoding: unused
2641 * Work around bugs in encoders which sometimes cannot be detected automatically.
2642 * - encoding: Set by user
2643 * - decoding: Set by user
2645 int workaround_bugs;
2646 #define FF_BUG_AUTODETECT 1 ///< autodetection
2647 #if FF_API_OLD_MSMPEG4
2648 #define FF_BUG_OLD_MSMPEG4 2
2650 #define FF_BUG_XVID_ILACE 4
2651 #define FF_BUG_UMP4 8
2652 #define FF_BUG_NO_PADDING 16
2653 #define FF_BUG_AMV 32
2655 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2657 #define FF_BUG_QPEL_CHROMA 64
2658 #define FF_BUG_STD_QPEL 128
2659 #define FF_BUG_QPEL_CHROMA2 256
2660 #define FF_BUG_DIRECT_BLOCKSIZE 512
2661 #define FF_BUG_EDGE 1024
2662 #define FF_BUG_HPEL_CHROMA 2048
2663 #define FF_BUG_DC_CLIP 4096
2664 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2665 #define FF_BUG_TRUNCATED 16384
2668 * strictly follow the standard (MPEG4, ...).
2669 * - encoding: Set by user.
2670 * - decoding: Set by user.
2671 * Setting this to STRICT or higher means the encoder and decoder will
2672 * generally do stupid things, whereas setting it to unofficial or lower
2673 * will mean the encoder might produce output that is not supported by all
2674 * spec-compliant decoders. Decoders don't differentiate between normal,
2675 * unofficial and experimental (that is, they always try to decode things
2676 * when they can) unless they are explicitly asked to behave stupidly
2677 * (=strictly conform to the specs)
2679 int strict_std_compliance;
2680 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2681 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2682 #define FF_COMPLIANCE_NORMAL 0
2683 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2684 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2687 * error concealment flags
2688 * - encoding: unused
2689 * - decoding: Set by user.
2691 int error_concealment;
2692 #define FF_EC_GUESS_MVS 1
2693 #define FF_EC_DEBLOCK 2
2694 #define FF_EC_FAVOR_INTER 256
2698 * - encoding: Set by user.
2699 * - decoding: Set by user.
2702 #define FF_DEBUG_PICT_INFO 1
2703 #define FF_DEBUG_RC 2
2704 #define FF_DEBUG_BITSTREAM 4
2705 #define FF_DEBUG_MB_TYPE 8
2706 #define FF_DEBUG_QP 16
2709 * @deprecated this option does nothing
2711 #define FF_DEBUG_MV 32
2713 #define FF_DEBUG_DCT_COEFF 0x00000040
2714 #define FF_DEBUG_SKIP 0x00000080
2715 #define FF_DEBUG_STARTCODE 0x00000100
2716 #if FF_API_UNUSED_MEMBERS
2717 #define FF_DEBUG_PTS 0x00000200
2718 #endif /* FF_API_UNUSED_MEMBERS */
2719 #define FF_DEBUG_ER 0x00000400
2720 #define FF_DEBUG_MMCO 0x00000800
2721 #define FF_DEBUG_BUGS 0x00001000
2723 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2724 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2726 #define FF_DEBUG_BUFFERS 0x00008000
2727 #define FF_DEBUG_THREADS 0x00010000
2728 #define FF_DEBUG_GREEN_MD 0x00800000
2729 #define FF_DEBUG_NOMC 0x01000000
2734 * Code outside libavcodec should access this field using AVOptions
2735 * - encoding: Set by user.
2736 * - decoding: Set by user.
2739 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2740 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2741 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2745 * Error recognition; may misdetect some more or less valid parts as errors.
2746 * - encoding: unused
2747 * - decoding: Set by user.
2749 int err_recognition;
2752 * Verify checksums embedded in the bitstream (could be of either encoded or
2753 * decoded data, depending on the codec) and print an error message on mismatch.
2754 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2755 * decoder returning an error.
2757 #define AV_EF_CRCCHECK (1<<0)
2758 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2759 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2760 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2762 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2763 #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
2764 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2765 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2769 * opaque 64bit number (generally a PTS) that will be reordered and
2770 * output in AVFrame.reordered_opaque
2771 * - encoding: unused
2772 * - decoding: Set by user.
2774 int64_t reordered_opaque;
2777 * Hardware accelerator in use
2778 * - encoding: unused.
2779 * - decoding: Set by libavcodec
2781 struct AVHWAccel *hwaccel;
2784 * Hardware accelerator context.
2785 * For some hardware accelerators, a global context needs to be
2786 * provided by the user. In that case, this holds display-dependent
2787 * data FFmpeg cannot instantiate itself. Please refer to the
2788 * FFmpeg HW accelerator documentation to know how to fill this
2789 * is. e.g. for VA API, this is a struct vaapi_context.
2790 * - encoding: unused
2791 * - decoding: Set by user
2793 void *hwaccel_context;
2797 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2798 * - decoding: unused
2800 uint64_t error[AV_NUM_DATA_POINTERS];
2803 * DCT algorithm, see FF_DCT_* below
2804 * - encoding: Set by user.
2805 * - decoding: unused
2808 #define FF_DCT_AUTO 0
2809 #define FF_DCT_FASTINT 1
2810 #define FF_DCT_INT 2
2811 #define FF_DCT_MMX 3
2812 #define FF_DCT_ALTIVEC 5
2813 #define FF_DCT_FAAN 6
2816 * IDCT algorithm, see FF_IDCT_* below.
2817 * - encoding: Set by user.
2818 * - decoding: Set by user.
2821 #define FF_IDCT_AUTO 0
2822 #define FF_IDCT_INT 1
2823 #define FF_IDCT_SIMPLE 2
2824 #define FF_IDCT_SIMPLEMMX 3
2825 #define FF_IDCT_ARM 7
2826 #define FF_IDCT_ALTIVEC 8
2828 #define FF_IDCT_SH4 9
2830 #define FF_IDCT_SIMPLEARM 10
2831 #if FF_API_UNUSED_MEMBERS
2832 #define FF_IDCT_IPP 13
2833 #endif /* FF_API_UNUSED_MEMBERS */
2834 #define FF_IDCT_XVID 14
2835 #if FF_API_IDCT_XVIDMMX
2836 #define FF_IDCT_XVIDMMX 14
2837 #endif /* FF_API_IDCT_XVIDMMX */
2838 #define FF_IDCT_SIMPLEARMV5TE 16
2839 #define FF_IDCT_SIMPLEARMV6 17
2840 #if FF_API_ARCH_SPARC
2841 #define FF_IDCT_SIMPLEVIS 18
2843 #define FF_IDCT_FAAN 20
2844 #define FF_IDCT_SIMPLENEON 22
2845 #if FF_API_ARCH_ALPHA
2846 #define FF_IDCT_SIMPLEALPHA 23
2848 #define FF_IDCT_SIMPLEAUTO 128
2851 * bits per sample/pixel from the demuxer (needed for huffyuv).
2852 * - encoding: Set by libavcodec.
2853 * - decoding: Set by user.
2855 int bits_per_coded_sample;
2858 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2859 * - encoding: set by user.
2860 * - decoding: set by libavcodec.
2862 int bits_per_raw_sample;
2866 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2867 * - encoding: unused
2868 * - decoding: Set by user.
2869 * Code outside libavcodec should access this field using:
2870 * av_codec_{get,set}_lowres(avctx)
2875 #if FF_API_CODED_FRAME
2877 * the picture in the bitstream
2878 * - encoding: Set by libavcodec.
2879 * - decoding: unused
2881 * @deprecated use the quality factor packet side data instead
2883 attribute_deprecated AVFrame *coded_frame;
2888 * is used to decide how many independent tasks should be passed to execute()
2889 * - encoding: Set by user.
2890 * - decoding: Set by user.
2895 * Which multithreading methods to use.
2896 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2897 * so clients which cannot provide future frames should not use it.
2899 * - encoding: Set by user, otherwise the default is used.
2900 * - decoding: Set by user, otherwise the default is used.
2903 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2904 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2907 * Which multithreading methods are in use by the codec.
2908 * - encoding: Set by libavcodec.
2909 * - decoding: Set by libavcodec.
2911 int active_thread_type;
2914 * Set by the client if its custom get_buffer() callback can be called
2915 * synchronously from another thread, which allows faster multithreaded decoding.
2916 * draw_horiz_band() will be called from other threads regardless of this setting.
2917 * Ignored if the default get_buffer() is used.
2918 * - encoding: Set by user.
2919 * - decoding: Set by user.
2921 int thread_safe_callbacks;
2924 * The codec may call this to execute several independent things.
2925 * It will return only after finishing all tasks.
2926 * The user may replace this with some multithreaded implementation,
2927 * the default implementation will execute the parts serially.
2928 * @param count the number of things to execute
2929 * - encoding: Set by libavcodec, user can override.
2930 * - decoding: Set by libavcodec, user can override.
2932 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2935 * The codec may call this to execute several independent things.
2936 * It will return only after finishing all tasks.
2937 * The user may replace this with some multithreaded implementation,
2938 * the default implementation will execute the parts serially.
2939 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2940 * @param c context passed also to func
2941 * @param count the number of things to execute
2942 * @param arg2 argument passed unchanged to func
2943 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2944 * @param func function that will be called count times, with jobnr from 0 to count-1.
2945 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2946 * two instances of func executing at the same time will have the same threadnr.
2947 * @return always 0 currently, but code should handle a future improvement where when any call to func
2948 * returns < 0 no further calls to func may be done and < 0 is returned.
2949 * - encoding: Set by libavcodec, user can override.
2950 * - decoding: Set by libavcodec, user can override.
2952 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2955 * noise vs. sse weight for the nsse comparison function
2956 * - encoding: Set by user.
2957 * - decoding: unused
2963 * - encoding: Set by user.
2964 * - decoding: Set by libavcodec.
2967 #define FF_PROFILE_UNKNOWN -99
2968 #define FF_PROFILE_RESERVED -100
2970 #define FF_PROFILE_AAC_MAIN 0
2971 #define FF_PROFILE_AAC_LOW 1
2972 #define FF_PROFILE_AAC_SSR 2
2973 #define FF_PROFILE_AAC_LTP 3
2974 #define FF_PROFILE_AAC_HE 4
2975 #define FF_PROFILE_AAC_HE_V2 28
2976 #define FF_PROFILE_AAC_LD 22
2977 #define FF_PROFILE_AAC_ELD 38
2978 #define FF_PROFILE_MPEG2_AAC_LOW 128
2979 #define FF_PROFILE_MPEG2_AAC_HE 131
2981 #define FF_PROFILE_DTS 20
2982 #define FF_PROFILE_DTS_ES 30
2983 #define FF_PROFILE_DTS_96_24 40
2984 #define FF_PROFILE_DTS_HD_HRA 50
2985 #define FF_PROFILE_DTS_HD_MA 60
2986 #define FF_PROFILE_DTS_EXPRESS 70
2988 #define FF_PROFILE_MPEG2_422 0
2989 #define FF_PROFILE_MPEG2_HIGH 1
2990 #define FF_PROFILE_MPEG2_SS 2
2991 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2992 #define FF_PROFILE_MPEG2_MAIN 4
2993 #define FF_PROFILE_MPEG2_SIMPLE 5
2995 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2996 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2998 #define FF_PROFILE_H264_BASELINE 66
2999 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3000 #define FF_PROFILE_H264_MAIN 77
3001 #define FF_PROFILE_H264_EXTENDED 88
3002 #define FF_PROFILE_H264_HIGH 100
3003 #define FF_PROFILE_H264_HIGH_10 110
3004 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3005 #define FF_PROFILE_H264_HIGH_422 122
3006 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3007 #define FF_PROFILE_H264_HIGH_444 144
3008 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3009 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3010 #define FF_PROFILE_H264_CAVLC_444 44
3012 #define FF_PROFILE_VC1_SIMPLE 0
3013 #define FF_PROFILE_VC1_MAIN 1
3014 #define FF_PROFILE_VC1_COMPLEX 2
3015 #define FF_PROFILE_VC1_ADVANCED 3
3017 #define FF_PROFILE_MPEG4_SIMPLE 0
3018 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3019 #define FF_PROFILE_MPEG4_CORE 2
3020 #define FF_PROFILE_MPEG4_MAIN 3
3021 #define FF_PROFILE_MPEG4_N_BIT 4
3022 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3023 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3024 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3025 #define FF_PROFILE_MPEG4_HYBRID 8
3026 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3027 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3028 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3029 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3030 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3031 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3032 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3034 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3035 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3036 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3037 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3038 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3040 #define FF_PROFILE_VP9_0 0
3041 #define FF_PROFILE_VP9_1 1
3042 #define FF_PROFILE_VP9_2 2
3043 #define FF_PROFILE_VP9_3 3
3045 #define FF_PROFILE_HEVC_MAIN 1
3046 #define FF_PROFILE_HEVC_MAIN_10 2
3047 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3048 #define FF_PROFILE_HEVC_REXT 4
3052 * - encoding: Set by user.
3053 * - decoding: Set by libavcodec.
3056 #define FF_LEVEL_UNKNOWN -99
3059 * Skip loop filtering for selected frames.
3060 * - encoding: unused
3061 * - decoding: Set by user.
3063 enum AVDiscard skip_loop_filter;
3066 * Skip IDCT/dequantization for selected frames.
3067 * - encoding: unused
3068 * - decoding: Set by user.
3070 enum AVDiscard skip_idct;
3073 * Skip decoding for selected frames.
3074 * - encoding: unused
3075 * - decoding: Set by user.
3077 enum AVDiscard skip_frame;
3080 * Header containing style information for text subtitles.
3081 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3082 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3083 * the Format line following. It shouldn't include any Dialogue line.
3084 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3085 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3087 uint8_t *subtitle_header;
3088 int subtitle_header_size;
3090 #if FF_API_ERROR_RATE
3092 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3095 attribute_deprecated
3100 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3101 * Used for compliant TS muxing.
3102 * - encoding: Set by libavcodec.
3103 * - decoding: unused.
3107 #if FF_API_SIDEDATA_ONLY_PKT
3109 * Encoding only and set by default. Allow encoders to output packets
3110 * that do not contain any encoded data, only side data.
3112 * Some encoders need to output such packets, e.g. to update some stream
3113 * parameters at the end of encoding.
3115 * @deprecated this field disables the default behaviour and
3116 * it is kept only for compatibility.
3118 attribute_deprecated
3119 int side_data_only_packets;
3123 * Audio only. The number of "priming" samples (padding) inserted by the
3124 * encoder at the beginning of the audio. I.e. this number of leading
3125 * decoded samples must be discarded by the caller to get the original audio
3126 * without leading padding.
3128 * - decoding: unused
3129 * - encoding: Set by libavcodec. The timestamps on the output packets are
3130 * adjusted by the encoder so that they always refer to the
3131 * first sample of the data actually contained in the packet,
3132 * including any added padding. E.g. if the timebase is
3133 * 1/samplerate and the timestamp of the first input sample is
3134 * 0, the timestamp of the first output packet will be
3137 int initial_padding;
3140 * - decoding: For codecs that store a framerate value in the compressed
3141 * bitstream, the decoder may export it here. { 0, 1} when
3143 * - encoding: unused
3145 AVRational framerate;
3148 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3149 * - encoding: unused.
3150 * - decoding: Set by libavcodec before calling get_format()
3152 enum AVPixelFormat sw_pix_fmt;
3155 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3156 * Code outside libavcodec should access this field using:
3157 * av_codec_{get,set}_pkt_timebase(avctx)
3158 * - encoding unused.
3159 * - decoding set by user.
3161 AVRational pkt_timebase;
3165 * Code outside libavcodec should access this field using:
3166 * av_codec_{get,set}_codec_descriptor(avctx)
3167 * - encoding: unused.
3168 * - decoding: set by libavcodec.
3170 const AVCodecDescriptor *codec_descriptor;
3174 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3175 * - encoding: unused
3176 * - decoding: Set by user.
3177 * Code outside libavcodec should access this field using:
3178 * av_codec_{get,set}_lowres(avctx)
3184 * Current statistics for PTS correction.
3185 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3186 * - encoding: unused
3188 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3189 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3190 int64_t pts_correction_last_pts; /// PTS of the last frame
3191 int64_t pts_correction_last_dts; /// DTS of the last frame
3194 * Character encoding of the input subtitles file.
3195 * - decoding: set by user
3196 * - encoding: unused
3201 * Subtitles character encoding mode. Formats or codecs might be adjusting
3202 * this setting (if they are doing the conversion themselves for instance).
3203 * - decoding: set by libavcodec
3204 * - encoding: unused
3206 int sub_charenc_mode;
3207 #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)
3208 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3209 #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
3212 * Skip processing alpha if supported by codec.
3213 * Note that if the format uses pre-multiplied alpha (common with VP6,
3214 * and recommended due to better video quality/compression)
3215 * the image will look as if alpha-blended onto a black background.
3216 * However for formats that do not use pre-multiplied alpha
3217 * there might be serious artefacts (though e.g. libswscale currently
3218 * assumes pre-multiplied alpha anyway).
3219 * Code outside libavcodec should access this field using AVOptions
3221 * - decoding: set by user
3222 * - encoding: unused
3227 * Number of samples to skip after a discontinuity
3228 * - decoding: unused
3229 * - encoding: set by libavcodec
3233 #if !FF_API_DEBUG_MV
3235 * debug motion vectors
3236 * Code outside libavcodec should access this field using AVOptions
3237 * - encoding: Set by user.
3238 * - decoding: Set by user.
3241 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3242 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3243 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3247 * custom intra quantization matrix
3248 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3249 * - encoding: Set by user, can be NULL.
3250 * - decoding: unused.
3252 uint16_t *chroma_intra_matrix;
3255 * dump format separator.
3256 * can be ", " or "\n " or anything else
3257 * Code outside libavcodec should access this field using AVOptions
3258 * (NO direct access).
3259 * - encoding: Set by user.
3260 * - decoding: Set by user.
3262 uint8_t *dump_separator;
3265 * ',' separated list of allowed decoders.
3266 * If NULL then all are allowed
3267 * - encoding: unused
3268 * - decoding: set by user through AVOPtions (NO direct access)
3270 char *codec_whitelist;
3273 * Properties of the stream that gets decoded
3274 * To be accessed through av_codec_get_properties() (NO direct access)
3275 * - encoding: unused
3276 * - decoding: set by libavcodec
3278 unsigned properties;
3279 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3280 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3283 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3284 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3286 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3287 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3289 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3291 int av_codec_get_lowres(const AVCodecContext *avctx);
3292 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3294 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3295 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3297 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3298 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3303 typedef struct AVProfile {
3305 const char *name; ///< short name for the profile
3308 typedef struct AVCodecDefault AVCodecDefault;
3315 typedef struct AVCodec {
3317 * Name of the codec implementation.
3318 * The name is globally unique among encoders and among decoders (but an
3319 * encoder and a decoder can share the same name).
3320 * This is the primary way to find a codec from the user perspective.
3324 * Descriptive name for the codec, meant to be more human readable than name.
3325 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3327 const char *long_name;
3328 enum AVMediaType type;
3331 * Codec capabilities.
3332 * see AV_CODEC_CAP_*
3335 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3336 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3337 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3338 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3339 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3340 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3341 const AVClass *priv_class; ///< AVClass for the private context
3342 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3344 /*****************************************************************
3345 * No fields below this line are part of the public API. They
3346 * may not be used outside of libavcodec and can be changed and
3348 * New public fields should be added right above.
3349 *****************************************************************
3352 struct AVCodec *next;
3354 * @name Frame-level threading support functions
3358 * If defined, called on thread contexts when they are created.
3359 * If the codec allocates writable tables in init(), re-allocate them here.
3360 * priv_data will be set to a copy of the original.
3362 int (*init_thread_copy)(AVCodecContext *);
3364 * Copy necessary context variables from a previous thread context to the current one.
3365 * If not defined, the next thread will start automatically; otherwise, the codec
3366 * must call ff_thread_finish_setup().
3368 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3370 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3374 * Private codec-specific defaults.
3376 const AVCodecDefault *defaults;
3379 * Initialize codec static data, called from avcodec_register().
3381 void (*init_static_data)(struct AVCodec *codec);
3383 int (*init)(AVCodecContext *);
3384 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3385 const struct AVSubtitle *sub);
3387 * Encode data to an AVPacket.
3389 * @param avctx codec context
3390 * @param avpkt output AVPacket (may contain a user-provided buffer)
3391 * @param[in] frame AVFrame containing the raw data to be encoded
3392 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3393 * non-empty packet was returned in avpkt.
3394 * @return 0 on success, negative error code on failure
3396 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3397 int *got_packet_ptr);
3398 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3399 int (*close)(AVCodecContext *);
3402 * Will be called when seeking
3404 void (*flush)(AVCodecContext *);
3406 * Internal codec capabilities.
3407 * See FF_CODEC_CAP_* in internal.h
3412 int av_codec_get_max_lowres(const AVCodec *codec);
3414 struct MpegEncContext;
3417 * @defgroup lavc_hwaccel AVHWAccel
3420 typedef struct AVHWAccel {
3422 * Name of the hardware accelerated codec.
3423 * The name is globally unique among encoders and among decoders (but an
3424 * encoder and a decoder can share the same name).
3429 * Type of codec implemented by the hardware accelerator.
3431 * See AVMEDIA_TYPE_xxx
3433 enum AVMediaType type;
3436 * Codec implemented by the hardware accelerator.
3438 * See AV_CODEC_ID_xxx
3443 * Supported pixel format.
3445 * Only hardware accelerated formats are supported here.
3447 enum AVPixelFormat pix_fmt;
3450 * Hardware accelerated codec capabilities.
3451 * see HWACCEL_CODEC_CAP_*
3455 /*****************************************************************
3456 * No fields below this line are part of the public API. They
3457 * may not be used outside of libavcodec and can be changed and
3459 * New public fields should be added right above.
3460 *****************************************************************
3462 struct AVHWAccel *next;
3465 * Allocate a custom buffer
3467 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3470 * Called at the beginning of each frame or field picture.
3472 * Meaningful frame information (codec specific) is guaranteed to
3473 * be parsed at this point. This function is mandatory.
3475 * Note that buf can be NULL along with buf_size set to 0.
3476 * Otherwise, this means the whole frame is available at this point.
3478 * @param avctx the codec context
3479 * @param buf the frame data buffer base
3480 * @param buf_size the size of the frame in bytes
3481 * @return zero if successful, a negative value otherwise
3483 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3486 * Callback for each slice.
3488 * Meaningful slice information (codec specific) is guaranteed to
3489 * be parsed at this point. This function is mandatory.
3490 * The only exception is XvMC, that works on MB level.
3492 * @param avctx the codec context
3493 * @param buf the slice data buffer base
3494 * @param buf_size the size of the slice in bytes
3495 * @return zero if successful, a negative value otherwise
3497 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3500 * Called at the end of each frame or field picture.
3502 * The whole picture is parsed at this point and can now be sent
3503 * to the hardware accelerator. This function is mandatory.
3505 * @param avctx the codec context
3506 * @return zero if successful, a negative value otherwise
3508 int (*end_frame)(AVCodecContext *avctx);
3511 * Size of per-frame hardware accelerator private data.
3513 * Private data is allocated with av_mallocz() before
3514 * AVCodecContext.get_buffer() and deallocated after
3515 * AVCodecContext.release_buffer().
3517 int frame_priv_data_size;
3520 * Called for every Macroblock in a slice.
3522 * XvMC uses it to replace the ff_mpv_decode_mb().
3523 * Instead of decoding to raw picture, MB parameters are
3524 * stored in an array provided by the video driver.
3526 * @param s the mpeg context
3528 void (*decode_mb)(struct MpegEncContext *s);
3531 * Initialize the hwaccel private data.
3533 * This will be called from ff_get_format(), after hwaccel and
3534 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3537 int (*init)(AVCodecContext *avctx);
3540 * Uninitialize the hwaccel private data.
3542 * This will be called from get_format() or avcodec_close(), after hwaccel
3543 * and hwaccel_context are already uninitialized.
3545 int (*uninit)(AVCodecContext *avctx);
3548 * Size of the private data to allocate in
3549 * AVCodecInternal.hwaccel_priv_data.
3555 * Hardware acceleration should be used for decoding even if the codec level
3556 * used is unknown or higher than the maximum supported level reported by the
3559 * It's generally a good idea to pass this flag unless you have a specific
3560 * reason not to, as hardware tends to under-report supported levels.
3562 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3565 * Hardware acceleration can output YUV pixel formats with a different chroma
3566 * sampling than 4:2:0 and/or other than 8 bits per component.
3568 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3575 * @defgroup lavc_picture AVPicture
3577 * Functions for working with AVPicture
3582 * Picture data structure.
3584 * Up to four components can be stored into it, the last component is
3587 typedef struct AVPicture {
3588 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3589 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3596 enum AVSubtitleType {
3599 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3602 * Plain text, the text field must be set by the decoder and is
3603 * authoritative. ass and pict fields may contain approximations.
3608 * Formatted text, the ass field must be set by the decoder and is
3609 * authoritative. pict and text fields may contain approximations.
3614 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3616 typedef struct AVSubtitleRect {
3617 int x; ///< top left corner of pict, undefined when pict is not set
3618 int y; ///< top left corner of pict, undefined when pict is not set
3619 int w; ///< width of pict, undefined when pict is not set
3620 int h; ///< height of pict, undefined when pict is not set
3621 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3623 #if FF_API_AVPICTURE
3625 * @deprecated unused
3627 attribute_deprecated
3631 * data+linesize for the bitmap of this subtitle.
3632 * Can be set for text/ass as well once they are rendered.
3637 enum AVSubtitleType type;
3639 char *text; ///< 0 terminated plain UTF-8 text
3642 * 0 terminated ASS/SSA compatible event line.
3643 * The presentation of this is unaffected by the other values in this
3651 typedef struct AVSubtitle {
3652 uint16_t format; /* 0 = graphics */
3653 uint32_t start_display_time; /* relative to packet pts, in ms */
3654 uint32_t end_display_time; /* relative to packet pts, in ms */
3656 AVSubtitleRect **rects;
3657 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3661 * If c is NULL, returns the first registered codec,
3662 * if c is non-NULL, returns the next registered codec after c,
3663 * or NULL if c is the last one.
3665 AVCodec *av_codec_next(const AVCodec *c);
3668 * Return the LIBAVCODEC_VERSION_INT constant.
3670 unsigned avcodec_version(void);
3673 * Return the libavcodec build-time configuration.
3675 const char *avcodec_configuration(void);
3678 * Return the libavcodec license.
3680 const char *avcodec_license(void);
3683 * Register the codec codec and initialize libavcodec.
3685 * @warning either this function or avcodec_register_all() must be called
3686 * before any other libavcodec functions.
3688 * @see avcodec_register_all()
3690 void avcodec_register(AVCodec *codec);
3693 * Register all the codecs, parsers and bitstream filters which were enabled at
3694 * configuration time. If you do not call this function you can select exactly
3695 * which formats you want to support, by using the individual registration
3698 * @see avcodec_register
3699 * @see av_register_codec_parser
3700 * @see av_register_bitstream_filter
3702 void avcodec_register_all(void);
3705 * Allocate an AVCodecContext and set its fields to default values. The
3706 * resulting struct should be freed with avcodec_free_context().
3708 * @param codec if non-NULL, allocate private data and initialize defaults
3709 * for the given codec. It is illegal to then call avcodec_open2()
3710 * with a different codec.
3711 * If NULL, then the codec-specific defaults won't be initialized,
3712 * which may result in suboptimal default settings (this is
3713 * important mainly for encoders, e.g. libx264).
3715 * @return An AVCodecContext filled with default values or NULL on failure.
3716 * @see avcodec_get_context_defaults
3718 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3721 * Free the codec context and everything associated with it and write NULL to
3722 * the provided pointer.
3724 void avcodec_free_context(AVCodecContext **avctx);
3727 * Set the fields of the given AVCodecContext to default values corresponding
3728 * to the given codec (defaults may be codec-dependent).
3730 * Do not call this function if a non-NULL codec has been passed
3731 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3732 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3733 * different codec on this AVCodecContext.
3735 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3738 * Get the AVClass for AVCodecContext. It can be used in combination with
3739 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3741 * @see av_opt_find().
3743 const AVClass *avcodec_get_class(void);
3746 * Get the AVClass for AVFrame. It can be used in combination with
3747 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3749 * @see av_opt_find().
3751 const AVClass *avcodec_get_frame_class(void);
3754 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3755 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3757 * @see av_opt_find().
3759 const AVClass *avcodec_get_subtitle_rect_class(void);
3762 * Copy the settings of the source AVCodecContext into the destination
3763 * AVCodecContext. The resulting destination codec context will be
3764 * unopened, i.e. you are required to call avcodec_open2() before you
3765 * can use this AVCodecContext to decode/encode video/audio data.
3767 * @param dest target codec context, should be initialized with
3768 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3769 * @param src source codec context
3770 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3772 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3775 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3776 * function the context has to be allocated with avcodec_alloc_context3().
3778 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3779 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3780 * retrieving a codec.
3782 * @warning This function is not thread safe!
3784 * @note Always call this function before using decoding routines (such as
3785 * @ref avcodec_decode_video2()).
3788 * avcodec_register_all();
3789 * av_dict_set(&opts, "b", "2.5M", 0);
3790 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3794 * context = avcodec_alloc_context3(codec);
3796 * if (avcodec_open2(context, codec, opts) < 0)
3800 * @param avctx The context to initialize.
3801 * @param codec The codec to open this context for. If a non-NULL codec has been
3802 * previously passed to avcodec_alloc_context3() or
3803 * avcodec_get_context_defaults3() for this context, then this
3804 * parameter MUST be either NULL or equal to the previously passed
3806 * @param options A dictionary filled with AVCodecContext and codec-private options.
3807 * On return this object will be filled with options that were not found.
3809 * @return zero on success, a negative value on error
3810 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3811 * av_dict_set(), av_opt_find().
3813 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3816 * Close a given AVCodecContext and free all the data associated with it
3817 * (but not the AVCodecContext itself).
3819 * Calling this function on an AVCodecContext that hasn't been opened will free
3820 * the codec-specific data allocated in avcodec_alloc_context3() /
3821 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3824 int avcodec_close(AVCodecContext *avctx);
3827 * Free all allocated data in the given subtitle struct.
3829 * @param sub AVSubtitle to free.
3831 void avsubtitle_free(AVSubtitle *sub);
3838 * @addtogroup lavc_packet
3843 * Initialize optional fields of a packet with default values.
3845 * Note, this does not touch the data and size members, which have to be
3846 * initialized separately.
3850 void av_init_packet(AVPacket *pkt);
3853 * Allocate the payload of a packet and initialize its fields with
3857 * @param size wanted payload size
3858 * @return 0 if OK, AVERROR_xxx otherwise
3860 int av_new_packet(AVPacket *pkt, int size);
3863 * Reduce packet size, correctly zeroing padding
3866 * @param size new size
3868 void av_shrink_packet(AVPacket *pkt, int size);
3871 * Increase packet size, correctly zeroing padding
3874 * @param grow_by number of bytes by which to increase the size of the packet
3876 int av_grow_packet(AVPacket *pkt, int grow_by);
3879 * Initialize a reference-counted packet from av_malloc()ed data.
3881 * @param pkt packet to be initialized. This function will set the data, size,
3882 * buf and destruct fields, all others are left untouched.
3883 * @param data Data allocated by av_malloc() to be used as packet data. If this
3884 * function returns successfully, the data is owned by the underlying AVBuffer.
3885 * The caller may not access the data through other means.
3886 * @param size size of data in bytes, without the padding. I.e. the full buffer
3887 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
3889 * @return 0 on success, a negative AVERROR on error
3891 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3894 * @warning This is a hack - the packet memory allocation stuff is broken. The
3895 * packet is allocated if it was not really allocated.
3897 int av_dup_packet(AVPacket *pkt);
3900 * Copy packet, including contents
3902 * @return 0 on success, negative AVERROR on fail
3904 int av_copy_packet(AVPacket *dst, const AVPacket *src);
3907 * Copy packet side data
3909 * @return 0 on success, negative AVERROR on fail
3911 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
3916 * @param pkt packet to free
3918 void av_free_packet(AVPacket *pkt);
3921 * Allocate new information of a packet.
3924 * @param type side information type
3925 * @param size side information size
3926 * @return pointer to fresh allocated data or NULL otherwise
3928 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3932 * Shrink the already allocated side data buffer
3935 * @param type side information type
3936 * @param size new side information size
3937 * @return 0 on success, < 0 on failure
3939 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3943 * Get side information from packet.
3946 * @param type desired side information type
3947 * @param size pointer for side information size to store (optional)
3948 * @return pointer to data if present or NULL otherwise
3950 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3953 int av_packet_merge_side_data(AVPacket *pkt);
3955 int av_packet_split_side_data(AVPacket *pkt);
3957 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
3960 * Pack a dictionary for use in side_data.
3962 * @param dict The dictionary to pack.
3963 * @param size pointer to store the size of the returned data
3964 * @return pointer to data if successful, NULL otherwise
3966 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
3968 * Unpack a dictionary from side_data.
3970 * @param data data from side_data
3971 * @param size size of the data
3972 * @param dict the metadata storage dictionary
3973 * @return 0 on success, < 0 on failure
3975 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
3979 * Convenience function to free all the side data stored.
3980 * All the other fields stay untouched.
3984 void av_packet_free_side_data(AVPacket *pkt);
3987 * Setup a new reference to the data described by a given packet
3989 * If src is reference-counted, setup dst as a new reference to the
3990 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3991 * data from src into it.
3993 * All the other fields are copied from src.
3995 * @see av_packet_unref
3997 * @param dst Destination packet
3998 * @param src Source packet
4000 * @return 0 on success, a negative AVERROR on error.
4002 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4007 * Unreference the buffer referenced by the packet and reset the
4008 * remaining packet fields to their default values.
4010 * @param pkt The packet to be unreferenced.
4012 void av_packet_unref(AVPacket *pkt);
4015 * Move every field in src to dst and reset src.
4017 * @see av_packet_unref
4019 * @param src Source packet, will be reset
4020 * @param dst Destination packet
4022 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4025 * Copy only "properties" fields from src to dst.
4027 * Properties for the purpose of this function are all the fields
4028 * beside those related to the packet data (buf, data, size)
4030 * @param dst Destination packet
4031 * @param src Source packet
4033 * @return 0 on success AVERROR on failure.
4036 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4039 * Convert valid timing fields (timestamps / durations) in a packet from one
4040 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4043 * @param pkt packet on which the conversion will be performed
4044 * @param tb_src source timebase, in which the timing fields in pkt are
4046 * @param tb_dst destination timebase, to which the timing fields will be
4049 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4056 * @addtogroup lavc_decoding
4061 * Find a registered decoder with a matching codec ID.
4063 * @param id AVCodecID of the requested decoder
4064 * @return A decoder if one was found, NULL otherwise.
4066 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4069 * Find a registered decoder with the specified name.
4071 * @param name name of the requested decoder
4072 * @return A decoder if one was found, NULL otherwise.
4074 AVCodec *avcodec_find_decoder_by_name(const char *name);
4077 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4078 * it can be called by custom get_buffer2() implementations for decoders without
4079 * AV_CODEC_CAP_DR1 set.
4081 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4085 * Return the amount of padding in pixels which the get_buffer callback must
4086 * provide around the edge of the image for codecs which do not have the
4087 * CODEC_FLAG_EMU_EDGE flag.
4089 * @return Required padding in pixels.
4091 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4094 attribute_deprecated
4095 unsigned avcodec_get_edge_width(void);
4099 * Modify width and height values so that they will result in a memory
4100 * buffer that is acceptable for the codec if you do not use any horizontal
4103 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4105 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4108 * Modify width and height values so that they will result in a memory
4109 * buffer that is acceptable for the codec if you also ensure that all
4110 * line sizes are a multiple of the respective linesize_align[i].
4112 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4114 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4115 int linesize_align[AV_NUM_DATA_POINTERS]);
4118 * Converts AVChromaLocation to swscale x/y chroma position.
4120 * The positions represent the chroma (0,0) position in a coordinates system
4121 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4123 * @param xpos horizontal chroma sample position
4124 * @param ypos vertical chroma sample position
4126 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4129 * Converts swscale x/y chroma position to AVChromaLocation.
4131 * The positions represent the chroma (0,0) position in a coordinates system
4132 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4134 * @param xpos horizontal chroma sample position
4135 * @param ypos vertical chroma sample position
4137 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4140 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4142 * Some decoders may support multiple frames in a single AVPacket. Such
4143 * decoders would then just decode the first frame and the return value would be
4144 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4145 * called again with an AVPacket containing the remaining data in order to
4146 * decode the second frame, etc... Even if no frames are returned, the packet
4147 * needs to be fed to the decoder with remaining data until it is completely
4148 * consumed or an error occurs.
4150 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4151 * and output. This means that for some packets they will not immediately
4152 * produce decoded output and need to be flushed at the end of decoding to get
4153 * all the decoded data. Flushing is done by calling this function with packets
4154 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4155 * returning samples. It is safe to flush even those decoders that are not
4156 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4158 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4159 * larger than the actual read bytes because some optimized bitstream
4160 * readers read 32 or 64 bits at once and could read over the end.
4162 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4163 * before packets may be fed to the decoder.
4165 * @param avctx the codec context
4166 * @param[out] frame The AVFrame in which to store decoded audio samples.
4167 * The decoder will allocate a buffer for the decoded frame by
4168 * calling the AVCodecContext.get_buffer2() callback.
4169 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4170 * reference counted and the returned reference belongs to the
4171 * caller. The caller must release the frame using av_frame_unref()
4172 * when the frame is no longer needed. The caller may safely write
4173 * to the frame if av_frame_is_writable() returns 1.
4174 * When AVCodecContext.refcounted_frames is set to 0, the returned
4175 * reference belongs to the decoder and is valid only until the
4176 * next call to this function or until closing or flushing the
4177 * decoder. The caller may not write to it.
4178 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4179 * non-zero. Note that this field being set to zero
4180 * does not mean that an error has occurred. For
4181 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4182 * call is guaranteed to produce a frame.
4183 * @param[in] avpkt The input AVPacket containing the input buffer.
4184 * At least avpkt->data and avpkt->size should be set. Some
4185 * decoders might also require additional fields to be set.
4186 * @return A negative error code is returned if an error occurred during
4187 * decoding, otherwise the number of bytes consumed from the input
4188 * AVPacket is returned.
4190 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4191 int *got_frame_ptr, const AVPacket *avpkt);
4194 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4195 * Some decoders may support multiple frames in a single AVPacket, such
4196 * decoders would then just decode the first frame.
4198 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4199 * the actual read bytes because some optimized bitstream readers read 32 or 64
4200 * bits at once and could read over the end.
4202 * @warning The end of the input buffer buf should be set to 0 to ensure that
4203 * no overreading happens for damaged MPEG streams.
4205 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4206 * between input and output, these need to be fed with avpkt->data=NULL,
4207 * avpkt->size=0 at the end to return the remaining frames.
4209 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4210 * before packets may be fed to the decoder.
4212 * @param avctx the codec context
4213 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4214 * Use av_frame_alloc() to get an AVFrame. The codec will
4215 * allocate memory for the actual bitmap by calling the
4216 * AVCodecContext.get_buffer2() callback.
4217 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4218 * reference counted and the returned reference belongs to the
4219 * caller. The caller must release the frame using av_frame_unref()
4220 * when the frame is no longer needed. The caller may safely write
4221 * to the frame if av_frame_is_writable() returns 1.
4222 * When AVCodecContext.refcounted_frames is set to 0, the returned
4223 * reference belongs to the decoder and is valid only until the
4224 * next call to this function or until closing or flushing the
4225 * decoder. The caller may not write to it.
4227 * @param[in] avpkt The input AVPacket containing the input buffer.
4228 * You can create such packet with av_init_packet() and by then setting
4229 * data and size, some decoders might in addition need other fields like
4230 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4232 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4233 * @return On error a negative value is returned, otherwise the number of bytes
4234 * used or zero if no frame could be decompressed.
4236 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4237 int *got_picture_ptr,
4238 const AVPacket *avpkt);
4241 * Decode a subtitle message.
4242 * Return a negative value on error, otherwise return the number of bytes used.
4243 * If no subtitle could be decompressed, got_sub_ptr is zero.
4244 * Otherwise, the subtitle is stored in *sub.
4245 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4246 * simplicity, because the performance difference is expect to be negligible
4247 * and reusing a get_buffer written for video codecs would probably perform badly
4248 * due to a potentially very different allocation pattern.
4250 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4251 * and output. This means that for some packets they will not immediately
4252 * produce decoded output and need to be flushed at the end of decoding to get
4253 * all the decoded data. Flushing is done by calling this function with packets
4254 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4255 * returning subtitles. It is safe to flush even those decoders that are not
4256 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4258 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4259 * before packets may be fed to the decoder.
4261 * @param avctx the codec context
4262 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4263 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4264 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4265 * @param[in] avpkt The input AVPacket containing the input buffer.
4267 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4272 * @defgroup lavc_parsing Frame parsing
4276 enum AVPictureStructure {
4277 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4278 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4279 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4280 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4283 typedef struct AVCodecParserContext {
4285 struct AVCodecParser *parser;
4286 int64_t frame_offset; /* offset of the current frame */
4287 int64_t cur_offset; /* current offset
4288 (incremented by each av_parser_parse()) */
4289 int64_t next_frame_offset; /* offset of the next frame */
4291 int pict_type; /* XXX: Put it back in AVCodecContext. */
4293 * This field is used for proper frame duration computation in lavf.
4294 * It signals, how much longer the frame duration of the current frame
4295 * is compared to normal frame duration.
4297 * frame_duration = (1 + repeat_pict) * time_base
4299 * It is used by codecs like H.264 to display telecined material.
4301 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4302 int64_t pts; /* pts of the current frame */
4303 int64_t dts; /* dts of the current frame */
4308 int fetch_timestamp;
4310 #define AV_PARSER_PTS_NB 4
4311 int cur_frame_start_index;
4312 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4313 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4314 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4317 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4318 #define PARSER_FLAG_ONCE 0x0002
4319 /// Set if the parser has a valid file offset
4320 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4321 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4323 int64_t offset; ///< byte offset from starting packet start
4324 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4327 * Set by parser to 1 for key frames and 0 for non-key frames.
4328 * It is initialized to -1, so if the parser doesn't set this flag,
4329 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4334 #if FF_API_CONVERGENCE_DURATION
4336 * @deprecated unused
4338 attribute_deprecated
4339 int64_t convergence_duration;
4342 // Timestamp generation support:
4344 * Synchronization point for start of timestamp generation.
4346 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4349 * For example, this corresponds to presence of H.264 buffering period
4355 * Offset of the current timestamp against last timestamp sync point in
4356 * units of AVCodecContext.time_base.
4358 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4359 * contain a valid timestamp offset.
4361 * Note that the timestamp of sync point has usually a nonzero
4362 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4363 * the next frame after timestamp sync point will be usually 1.
4365 * For example, this corresponds to H.264 cpb_removal_delay.
4367 int dts_ref_dts_delta;
4370 * Presentation delay of current frame in units of AVCodecContext.time_base.
4372 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4373 * contain valid non-negative timestamp delta (presentation time of a frame
4374 * must not lie in the past).
4376 * This delay represents the difference between decoding and presentation
4377 * time of the frame.
4379 * For example, this corresponds to H.264 dpb_output_delay.
4384 * Position of the packet in file.
4386 * Analogous to cur_frame_pts/dts
4388 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4391 * Byte position of currently parsed frame in stream.
4396 * Previous frame byte position.
4401 * Duration of the current frame.
4402 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4403 * For all other types, this is in units of AVCodecContext.time_base.
4407 enum AVFieldOrder field_order;
4410 * Indicate whether a picture is coded as a frame, top field or bottom field.
4412 * For example, H.264 field_pic_flag equal to 0 corresponds to
4413 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4414 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4415 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4417 enum AVPictureStructure picture_structure;
4420 * Picture number incremented in presentation or output order.
4421 * This field may be reinitialized at the first picture of a new sequence.
4423 * For example, this corresponds to H.264 PicOrderCnt.
4425 int output_picture_number;
4428 * Dimensions of the decoded video intended for presentation.
4434 * Dimensions of the coded video.
4440 * The format of the coded data, corresponds to enum AVPixelFormat for video
4441 * and for enum AVSampleFormat for audio.
4443 * Note that a decoder can have considerable freedom in how exactly it
4444 * decodes the data, so the format reported here might be different from the
4445 * one returned by a decoder.
4448 } AVCodecParserContext;
4450 typedef struct AVCodecParser {
4451 int codec_ids[5]; /* several codec IDs are permitted */
4453 int (*parser_init)(AVCodecParserContext *s);
4454 /* This callback never returns an error, a negative value means that
4455 * the frame start was in a previous packet. */
4456 int (*parser_parse)(AVCodecParserContext *s,
4457 AVCodecContext *avctx,
4458 const uint8_t **poutbuf, int *poutbuf_size,
4459 const uint8_t *buf, int buf_size);
4460 void (*parser_close)(AVCodecParserContext *s);
4461 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4462 struct AVCodecParser *next;
4465 AVCodecParser *av_parser_next(const AVCodecParser *c);
4467 void av_register_codec_parser(AVCodecParser *parser);
4468 AVCodecParserContext *av_parser_init(int codec_id);
4473 * @param s parser context.
4474 * @param avctx codec context.
4475 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4476 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4477 * @param buf input buffer.
4478 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4479 * @param pts input presentation timestamp.
4480 * @param dts input decoding timestamp.
4481 * @param pos input byte position in stream.
4482 * @return the number of bytes of the input bitstream used.
4487 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4494 * decode_frame(data, size);
4498 int av_parser_parse2(AVCodecParserContext *s,
4499 AVCodecContext *avctx,
4500 uint8_t **poutbuf, int *poutbuf_size,
4501 const uint8_t *buf, int buf_size,
4502 int64_t pts, int64_t dts,
4506 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4507 * @deprecated use AVBitStreamFilter
4509 int av_parser_change(AVCodecParserContext *s,
4510 AVCodecContext *avctx,
4511 uint8_t **poutbuf, int *poutbuf_size,
4512 const uint8_t *buf, int buf_size, int keyframe);
4513 void av_parser_close(AVCodecParserContext *s);
4521 * @addtogroup lavc_encoding
4526 * Find a registered encoder with a matching codec ID.
4528 * @param id AVCodecID of the requested encoder
4529 * @return An encoder if one was found, NULL otherwise.
4531 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4534 * Find a registered encoder with the specified name.
4536 * @param name name of the requested encoder
4537 * @return An encoder if one was found, NULL otherwise.
4539 AVCodec *avcodec_find_encoder_by_name(const char *name);
4542 * Encode a frame of audio.
4544 * Takes input samples from frame and writes the next output packet, if
4545 * available, to avpkt. The output packet does not necessarily contain data for
4546 * the most recent frame, as encoders can delay, split, and combine input frames
4547 * internally as needed.
4549 * @param avctx codec context
4550 * @param avpkt output AVPacket.
4551 * The user can supply an output buffer by setting
4552 * avpkt->data and avpkt->size prior to calling the
4553 * function, but if the size of the user-provided data is not
4554 * large enough, encoding will fail. If avpkt->data and
4555 * avpkt->size are set, avpkt->destruct must also be set. All
4556 * other AVPacket fields will be reset by the encoder using
4557 * av_init_packet(). If avpkt->data is NULL, the encoder will
4558 * allocate it. The encoder will set avpkt->size to the size
4559 * of the output packet.
4561 * If this function fails or produces no output, avpkt will be
4562 * freed using av_free_packet() (i.e. avpkt->destruct will be
4563 * called to free the user supplied buffer).
4564 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4565 * May be NULL when flushing an encoder that has the
4566 * AV_CODEC_CAP_DELAY capability set.
4567 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4568 * can have any number of samples.
4569 * If it is not set, frame->nb_samples must be equal to
4570 * avctx->frame_size for all frames except the last.
4571 * The final frame may be smaller than avctx->frame_size.
4572 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4573 * output packet is non-empty, and to 0 if it is
4574 * empty. If the function returns an error, the
4575 * packet can be assumed to be invalid, and the
4576 * value of got_packet_ptr is undefined and should
4578 * @return 0 on success, negative error code on failure
4580 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4581 const AVFrame *frame, int *got_packet_ptr);
4584 * Encode a frame of video.
4586 * Takes input raw video data from frame and writes the next output packet, if
4587 * available, to avpkt. The output packet does not necessarily contain data for
4588 * the most recent frame, as encoders can delay and reorder input frames
4589 * internally as needed.
4591 * @param avctx codec context
4592 * @param avpkt output AVPacket.
4593 * The user can supply an output buffer by setting
4594 * avpkt->data and avpkt->size prior to calling the
4595 * function, but if the size of the user-provided data is not
4596 * large enough, encoding will fail. All other AVPacket fields
4597 * will be reset by the encoder using av_init_packet(). If
4598 * avpkt->data is NULL, the encoder will allocate it.
4599 * The encoder will set avpkt->size to the size of the
4600 * output packet. The returned data (if any) belongs to the
4601 * caller, he is responsible for freeing it.
4603 * If this function fails or produces no output, avpkt will be
4604 * freed using av_free_packet() (i.e. avpkt->destruct will be
4605 * called to free the user supplied buffer).
4606 * @param[in] frame AVFrame containing the raw video data to be encoded.
4607 * May be NULL when flushing an encoder that has the
4608 * AV_CODEC_CAP_DELAY capability set.
4609 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4610 * output packet is non-empty, and to 0 if it is
4611 * empty. If the function returns an error, the
4612 * packet can be assumed to be invalid, and the
4613 * value of got_packet_ptr is undefined and should
4615 * @return 0 on success, negative error code on failure
4617 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4618 const AVFrame *frame, int *got_packet_ptr);
4620 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4621 const AVSubtitle *sub);
4628 #if FF_API_AVCODEC_RESAMPLE
4630 * @defgroup lavc_resample Audio resampling
4632 * @deprecated use libswresample instead
4636 struct ReSampleContext;
4637 struct AVResampleContext;
4639 typedef struct ReSampleContext ReSampleContext;
4642 * Initialize audio resampling context.
4644 * @param output_channels number of output channels
4645 * @param input_channels number of input channels
4646 * @param output_rate output sample rate
4647 * @param input_rate input sample rate
4648 * @param sample_fmt_out requested output sample format
4649 * @param sample_fmt_in input sample format
4650 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4651 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4652 * @param linear if 1 then the used FIR filter will be linearly interpolated
4653 between the 2 closest, if 0 the closest will be used
4654 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4655 * @return allocated ReSampleContext, NULL if error occurred
4657 attribute_deprecated
4658 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4659 int output_rate, int input_rate,
4660 enum AVSampleFormat sample_fmt_out,
4661 enum AVSampleFormat sample_fmt_in,
4662 int filter_length, int log2_phase_count,
4663 int linear, double cutoff);
4665 attribute_deprecated
4666 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4669 * Free resample context.
4671 * @param s a non-NULL pointer to a resample context previously
4672 * created with av_audio_resample_init()
4674 attribute_deprecated
4675 void audio_resample_close(ReSampleContext *s);
4679 * Initialize an audio resampler.
4680 * Note, if either rate is not an integer then simply scale both rates up so they are.
4681 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4682 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4683 * @param linear If 1 then the used FIR filter will be linearly interpolated
4684 between the 2 closest, if 0 the closest will be used
4685 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4687 attribute_deprecated
4688 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4691 * Resample an array of samples using a previously configured context.
4692 * @param src an array of unconsumed samples
4693 * @param consumed the number of samples of src which have been consumed are returned here
4694 * @param src_size the number of unconsumed samples available
4695 * @param dst_size the amount of space in samples available in dst
4696 * @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.
4697 * @return the number of samples written in dst or -1 if an error occurred
4699 attribute_deprecated
4700 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4704 * Compensate samplerate/timestamp drift. The compensation is done by changing
4705 * the resampler parameters, so no audible clicks or similar distortions occur
4706 * @param compensation_distance distance in output samples over which the compensation should be performed
4707 * @param sample_delta number of output samples which should be output less
4709 * example: av_resample_compensate(c, 10, 500)
4710 * here instead of 510 samples only 500 samples would be output
4712 * note, due to rounding the actual compensation might be slightly different,
4713 * especially if the compensation_distance is large and the in_rate used during init is small
4715 attribute_deprecated
4716 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4717 attribute_deprecated
4718 void av_resample_close(struct AVResampleContext *c);
4726 * @addtogroup lavc_picture
4731 * Allocate memory for the pixels of a picture and setup the AVPicture
4734 * Call avpicture_free() to free it.
4736 * @param picture the picture structure to be filled in
4737 * @param pix_fmt the pixel format of the picture
4738 * @param width the width of the picture
4739 * @param height the height of the picture
4740 * @return zero if successful, a negative error code otherwise
4742 * @see av_image_alloc(), avpicture_fill()
4744 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4747 * Free a picture previously allocated by avpicture_alloc().
4748 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4751 * @param picture the AVPicture to be freed
4753 void avpicture_free(AVPicture *picture);
4756 * Setup the picture fields based on the specified image parameters
4757 * and the provided image data buffer.
4759 * The picture fields are filled in by using the image data buffer
4760 * pointed to by ptr.
4762 * If ptr is NULL, the function will fill only the picture linesize
4763 * array and return the required size for the image buffer.
4765 * To allocate an image buffer and fill the picture data in one call,
4766 * use avpicture_alloc().
4768 * @param picture the picture to be filled in
4769 * @param ptr buffer where the image data is stored, or NULL
4770 * @param pix_fmt the pixel format of the image
4771 * @param width the width of the image in pixels
4772 * @param height the height of the image in pixels
4773 * @return the size in bytes required for src, a negative error code
4774 * in case of failure
4776 * @see av_image_fill_arrays()
4778 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4779 enum AVPixelFormat pix_fmt, int width, int height);
4782 * Copy pixel data from an AVPicture into a buffer.
4784 * avpicture_get_size() can be used to compute the required size for
4785 * the buffer to fill.
4787 * @param src source picture with filled data
4788 * @param pix_fmt picture pixel format
4789 * @param width picture width
4790 * @param height picture height
4791 * @param dest destination buffer
4792 * @param dest_size destination buffer size in bytes
4793 * @return the number of bytes written to dest, or a negative value
4794 * (error code) on error, for example if the destination buffer is not
4797 * @see av_image_copy_to_buffer()
4799 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4800 int width, int height,
4801 unsigned char *dest, int dest_size);
4804 * Calculate the size in bytes that a picture of the given width and height
4805 * would occupy if stored in the given picture format.
4807 * @param pix_fmt picture pixel format
4808 * @param width picture width
4809 * @param height picture height
4810 * @return the computed picture buffer size or a negative error code
4813 * @see av_image_get_buffer_size().
4815 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4818 * Copy image src to dst. Wraps av_image_copy().
4820 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4821 enum AVPixelFormat pix_fmt, int width, int height);
4824 * Crop image top and left side.
4826 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4827 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4832 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4833 int padtop, int padbottom, int padleft, int padright, int *color);
4840 * @defgroup lavc_misc Utility functions
4843 * Miscellaneous utility functions related to both encoding and decoding
4849 * @defgroup lavc_misc_pixfmt Pixel formats
4851 * Functions for working with pixel formats.
4856 * Utility function to access log2_chroma_w log2_chroma_h from
4857 * the pixel format AVPixFmtDescriptor.
4859 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4860 * for one that returns a failure code and continues in case of invalid
4863 * @param[in] pix_fmt the pixel format
4864 * @param[out] h_shift store log2_chroma_w
4865 * @param[out] v_shift store log2_chroma_h
4867 * @see av_pix_fmt_get_chroma_sub_sample
4870 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4873 * Return a value representing the fourCC code associated to the
4874 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4877 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4880 * @deprecated see av_get_pix_fmt_loss()
4882 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4886 * Find the best pixel format to convert to given a certain source pixel
4887 * format. When converting from one pixel format to another, information loss
4888 * may occur. For example, when converting from RGB24 to GRAY, the color
4889 * information will be lost. Similarly, other losses occur when converting from
4890 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4891 * the given pixel formats should be used to suffer the least amount of loss.
4892 * The pixel formats from which it chooses one, are determined by the
4893 * pix_fmt_list parameter.
4896 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4897 * @param[in] src_pix_fmt source pixel format
4898 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4899 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4900 * @return The best pixel format to convert to or -1 if none was found.
4902 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4903 enum AVPixelFormat src_pix_fmt,
4904 int has_alpha, int *loss_ptr);
4907 * @deprecated see av_find_best_pix_fmt_of_2()
4909 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4910 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4912 attribute_deprecated
4913 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4914 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4915 enum AVPixelFormat src_pix_fmt,
4916 int has_alpha, int *loss_ptr);
4918 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4919 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4923 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4929 #if FF_API_SET_DIMENSIONS
4931 * @deprecated this function is not supposed to be used from outside of lavc
4933 attribute_deprecated
4934 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4938 * Put a string representing the codec tag codec_tag in buf.
4940 * @param buf buffer to place codec tag in
4941 * @param buf_size size in bytes of buf
4942 * @param codec_tag codec tag to assign
4943 * @return the length of the string that would have been generated if
4944 * enough space had been available, excluding the trailing null
4946 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4948 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4951 * Return a name for the specified profile, if available.
4953 * @param codec the codec that is searched for the given profile
4954 * @param profile the profile value for which a name is requested
4955 * @return A name for the profile if found, NULL otherwise.
4957 const char *av_get_profile_name(const AVCodec *codec, int profile);
4959 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4960 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4961 //FIXME func typedef
4964 * Fill AVFrame audio data and linesize pointers.
4966 * The buffer buf must be a preallocated buffer with a size big enough
4967 * to contain the specified samples amount. The filled AVFrame data
4968 * pointers will point to this buffer.
4970 * AVFrame extended_data channel pointers are allocated if necessary for
4973 * @param frame the AVFrame
4974 * frame->nb_samples must be set prior to calling the
4975 * function. This function fills in frame->data,
4976 * frame->extended_data, frame->linesize[0].
4977 * @param nb_channels channel count
4978 * @param sample_fmt sample format
4979 * @param buf buffer to use for frame data
4980 * @param buf_size size of buffer
4981 * @param align plane size sample alignment (0 = default)
4982 * @return >=0 on success, negative error code on failure
4983 * @todo return the size in bytes required to store the samples in
4984 * case of success, at the next libavutil bump
4986 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4987 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4988 int buf_size, int align);
4991 * Reset the internal decoder state / flush internal buffers. Should be called
4992 * e.g. when seeking or when switching to a different stream.
4994 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4995 * this invalidates the frames previously returned from the decoder. When
4996 * refcounted frames are used, the decoder just releases any references it might
4997 * keep internally, but the caller's reference remains valid.
4999 void avcodec_flush_buffers(AVCodecContext *avctx);
5002 * Return codec bits per sample.
5004 * @param[in] codec_id the codec
5005 * @return Number of bits per sample or zero if unknown for the given codec.
5007 int av_get_bits_per_sample(enum AVCodecID codec_id);
5010 * Return the PCM codec associated with a sample format.
5011 * @param be endianness, 0 for little, 1 for big,
5012 * -1 (or anything else) for native
5013 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5015 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5018 * Return codec bits per sample.
5019 * Only return non-zero if the bits per sample is exactly correct, not an
5022 * @param[in] codec_id the codec
5023 * @return Number of bits per sample or zero if unknown for the given codec.
5025 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5028 * Return audio frame duration.
5030 * @param avctx codec context
5031 * @param frame_bytes size of the frame, or 0 if unknown
5032 * @return frame duration, in samples, if known. 0 if not able to
5035 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5038 typedef struct AVBitStreamFilterContext {
5040 struct AVBitStreamFilter *filter;
5041 AVCodecParserContext *parser;
5042 struct AVBitStreamFilterContext *next;
5044 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5045 * Not for access by library users.
5048 } AVBitStreamFilterContext;
5051 typedef struct AVBitStreamFilter {
5054 int (*filter)(AVBitStreamFilterContext *bsfc,
5055 AVCodecContext *avctx, const char *args,
5056 uint8_t **poutbuf, int *poutbuf_size,
5057 const uint8_t *buf, int buf_size, int keyframe);
5058 void (*close)(AVBitStreamFilterContext *bsfc);
5059 struct AVBitStreamFilter *next;
5060 } AVBitStreamFilter;
5063 * Register a bitstream filter.
5065 * The filter will be accessible to the application code through
5066 * av_bitstream_filter_next() or can be directly initialized with
5067 * av_bitstream_filter_init().
5069 * @see avcodec_register_all()
5071 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5074 * Create and initialize a bitstream filter context given a bitstream
5077 * The returned context must be freed with av_bitstream_filter_close().
5079 * @param name the name of the bitstream filter
5080 * @return a bitstream filter context if a matching filter was found
5081 * and successfully initialized, NULL otherwise
5083 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5088 * This function filters the buffer buf with size buf_size, and places the
5089 * filtered buffer in the buffer pointed to by poutbuf.
5091 * The output buffer must be freed by the caller.
5093 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5094 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5095 * If specified, this must point to the encoder context of the
5096 * output stream the packet is sent to.
5097 * @param args arguments which specify the filter configuration, may be NULL
5098 * @param poutbuf pointer which is updated to point to the filtered buffer
5099 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5100 * @param buf buffer containing the data to filter
5101 * @param buf_size size in bytes of buf
5102 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5103 * @return >= 0 in case of success, or a negative error code in case of failure
5105 * If the return value is positive, an output buffer is allocated and
5106 * is available in *poutbuf, and is distinct from the input buffer.
5108 * If the return value is 0, the output buffer is not allocated and
5109 * should be considered identical to the input buffer, or in case
5110 * *poutbuf was set it points to the input buffer (not necessarily to
5111 * its starting address).
5113 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5114 AVCodecContext *avctx, const char *args,
5115 uint8_t **poutbuf, int *poutbuf_size,
5116 const uint8_t *buf, int buf_size, int keyframe);
5119 * Release bitstream filter context.
5121 * @param bsf the bitstream filter context created with
5122 * av_bitstream_filter_init(), can be NULL
5124 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5127 * If f is NULL, return the first registered bitstream filter,
5128 * if f is non-NULL, return the next registered bitstream filter
5129 * after f, or NULL if f is the last one.
5131 * This function can be used to iterate over all registered bitstream
5134 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5139 * Same behaviour av_fast_malloc but the buffer has additional
5140 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5142 * In addition the whole buffer will initially and after resizes
5143 * be 0-initialized so that no uninitialized data will ever appear.
5145 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5148 * Same behaviour av_fast_padded_malloc except that buffer will always
5149 * be 0-initialized after call.
5151 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5154 * Encode extradata length to a buffer. Used by xiph codecs.
5156 * @param s buffer to write to; must be at least (v/255+1) bytes long
5157 * @param v size of extradata in bytes
5158 * @return number of bytes written to the buffer.
5160 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5162 #if FF_API_MISSING_SAMPLE
5164 * Log a generic warning message about a missing feature. This function is
5165 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5166 * only, and would normally not be used by applications.
5167 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5168 * a pointer to an AVClass struct
5169 * @param[in] feature string containing the name of the missing feature
5170 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5171 * If want_sample is non-zero, additional verbage will be added to the log
5172 * message which tells the user how to report samples to the development
5174 * @deprecated Use avpriv_report_missing_feature() instead.
5176 attribute_deprecated
5177 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5180 * Log a generic warning message asking for a sample. This function is
5181 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5182 * only, and would normally not be used by applications.
5183 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5184 * a pointer to an AVClass struct
5185 * @param[in] msg string containing an optional message, or NULL if no message
5186 * @deprecated Use avpriv_request_sample() instead.
5188 attribute_deprecated
5189 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5190 #endif /* FF_API_MISSING_SAMPLE */
5193 * Register the hardware accelerator hwaccel.
5195 void av_register_hwaccel(AVHWAccel *hwaccel);
5198 * If hwaccel is NULL, returns the first registered hardware accelerator,
5199 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5200 * after hwaccel, or NULL if hwaccel is the last one.
5202 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5206 * Lock operation used by lockmgr
5209 AV_LOCK_CREATE, ///< Create a mutex
5210 AV_LOCK_OBTAIN, ///< Lock the mutex
5211 AV_LOCK_RELEASE, ///< Unlock the mutex
5212 AV_LOCK_DESTROY, ///< Free mutex resources
5216 * Register a user provided lock manager supporting the operations
5217 * specified by AVLockOp. The "mutex" argument to the function points
5218 * to a (void *) where the lockmgr should store/get a pointer to a user
5219 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5220 * value left by the last call for all other ops. If the lock manager is
5221 * unable to perform the op then it should leave the mutex in the same
5222 * state as when it was called and return a non-zero value. However,
5223 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5224 * have been successfully destroyed. If av_lockmgr_register succeeds
5225 * it will return a non-negative value, if it fails it will return a
5226 * negative value and destroy all mutex and unregister all callbacks.
5227 * av_lockmgr_register is not thread-safe, it must be called from a
5228 * single thread before any calls which make use of locking are used.
5230 * @param cb User defined callback. av_lockmgr_register invokes calls
5231 * to this callback and the previously registered callback.
5232 * The callback will be used to create more than one mutex
5233 * each of which must be backed by its own underlying locking
5234 * mechanism (i.e. do not use a single static object to
5235 * implement your lock manager). If cb is set to NULL the
5236 * lockmgr will be unregistered.
5238 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5241 * Get the type of the given codec.
5243 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5246 * Get the name of a codec.
5247 * @return a static string identifying the codec; never NULL
5249 const char *avcodec_get_name(enum AVCodecID id);
5252 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5253 * with no corresponding avcodec_close()), 0 otherwise.
5255 int avcodec_is_open(AVCodecContext *s);
5258 * @return a non-zero number if codec is an encoder, zero otherwise
5260 int av_codec_is_encoder(const AVCodec *codec);
5263 * @return a non-zero number if codec is a decoder, zero otherwise
5265 int av_codec_is_decoder(const AVCodec *codec);
5268 * @return descriptor for given codec ID or NULL if no descriptor exists.
5270 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5273 * Iterate over all codec descriptors known to libavcodec.
5275 * @param prev previous descriptor. NULL to get the first descriptor.
5277 * @return next descriptor or NULL after the last descriptor
5279 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5282 * @return codec descriptor with the given name or NULL if no such descriptor
5285 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5291 #endif /* AVCODEC_AVCODEC_H */