2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
46 * @defgroup libavc Encoding/Decoding Library
49 * @defgroup lavc_decoding Decoding
53 * @defgroup lavc_encoding Encoding
57 * @defgroup lavc_codec Codecs
59 * @defgroup lavc_codec_native Native Codecs
62 * @defgroup lavc_codec_wrappers External library wrappers
65 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
69 * @defgroup lavc_internal Internal
77 * @defgroup lavc_core Core functions/structures.
80 * Basic definitions, functions for querying libavcodec capabilities,
81 * allocating core structures, etc.
87 * Identify the syntax and semantics of the bitstream.
88 * The principle is roughly:
89 * Two decoders with the same ID can decode the same streams.
90 * Two encoders with the same ID can encode compatible streams.
91 * There may be slight deviations from the principle due to implementation
94 * If you add a codec ID to this list, add it so that
95 * 1. no value of a existing codec ID changes (that would break ABI),
96 * 2. it is as close as possible to similar codecs
98 * After adding new codec IDs, do not forget to add an entry to the codec
99 * descriptor list and bump libavcodec minor version.
105 AV_CODEC_ID_MPEG1VIDEO,
106 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
108 AV_CODEC_ID_MPEG2VIDEO_XVMC,
109 #endif /* FF_API_XVMC */
120 AV_CODEC_ID_RAWVIDEO,
121 AV_CODEC_ID_MSMPEG4V1,
122 AV_CODEC_ID_MSMPEG4V2,
123 AV_CODEC_ID_MSMPEG4V3,
146 AV_CODEC_ID_INTERPLAY_VIDEO,
153 AV_CODEC_ID_MSVIDEO1,
158 AV_CODEC_ID_TRUEMOTION1,
159 AV_CODEC_ID_VMDVIDEO,
184 AV_CODEC_ID_TRUEMOTION2,
190 AV_CODEC_ID_SMACKVIDEO,
195 AV_CODEC_ID_JPEG2000,
201 AV_CODEC_ID_DSICINVIDEO,
202 AV_CODEC_ID_TIERTEXSEQVIDEO,
210 AV_CODEC_ID_BETHSOFTVID,
222 AV_CODEC_ID_ESCAPE124,
226 AV_CODEC_ID_MOTIONPIXELS,
238 AV_CODEC_ID_FLASHSV2,
239 AV_CODEC_ID_CDGRAPHICS,
242 AV_CODEC_ID_BINKVIDEO,
243 AV_CODEC_ID_IFF_ILBM,
244 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
250 AV_CODEC_ID_A64_MULTI,
251 AV_CODEC_ID_A64_MULTI5,
254 AV_CODEC_ID_LAGARITH,
258 AV_CODEC_ID_WMV3IMAGE,
259 AV_CODEC_ID_VC1IMAGE,
261 AV_CODEC_ID_BMV_VIDEO,
268 AV_CODEC_ID_ZEROCODEC,
277 AV_CODEC_ID_ESCAPE130,
280 AV_CODEC_ID_HNM4_VIDEO,
282 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
284 AV_CODEC_ID_ALIAS_PIX,
285 AV_CODEC_ID_BRENDER_PIX,
286 AV_CODEC_ID_PAF_VIDEO,
299 AV_CODEC_ID_SCREENPRESSO,
302 AV_CODEC_ID_Y41P = 0x8000,
307 AV_CODEC_ID_TARGA_Y216,
319 /* various PCM "codecs" */
320 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
321 AV_CODEC_ID_PCM_S16LE = 0x10000,
322 AV_CODEC_ID_PCM_S16BE,
323 AV_CODEC_ID_PCM_U16LE,
324 AV_CODEC_ID_PCM_U16BE,
327 AV_CODEC_ID_PCM_MULAW,
328 AV_CODEC_ID_PCM_ALAW,
329 AV_CODEC_ID_PCM_S32LE,
330 AV_CODEC_ID_PCM_S32BE,
331 AV_CODEC_ID_PCM_U32LE,
332 AV_CODEC_ID_PCM_U32BE,
333 AV_CODEC_ID_PCM_S24LE,
334 AV_CODEC_ID_PCM_S24BE,
335 AV_CODEC_ID_PCM_U24LE,
336 AV_CODEC_ID_PCM_U24BE,
337 AV_CODEC_ID_PCM_S24DAUD,
338 AV_CODEC_ID_PCM_ZORK,
339 AV_CODEC_ID_PCM_S16LE_PLANAR,
341 AV_CODEC_ID_PCM_F32BE,
342 AV_CODEC_ID_PCM_F32LE,
343 AV_CODEC_ID_PCM_F64BE,
344 AV_CODEC_ID_PCM_F64LE,
345 AV_CODEC_ID_PCM_BLURAY,
348 AV_CODEC_ID_PCM_S8_PLANAR,
349 AV_CODEC_ID_PCM_S24LE_PLANAR,
350 AV_CODEC_ID_PCM_S32LE_PLANAR,
351 AV_CODEC_ID_PCM_S16BE_PLANAR,
352 /* new PCM "codecs" should be added right below this line starting with
353 * an explicit value of for example 0x10800
356 /* various ADPCM codecs */
357 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
358 AV_CODEC_ID_ADPCM_IMA_WAV,
359 AV_CODEC_ID_ADPCM_IMA_DK3,
360 AV_CODEC_ID_ADPCM_IMA_DK4,
361 AV_CODEC_ID_ADPCM_IMA_WS,
362 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
363 AV_CODEC_ID_ADPCM_MS,
364 AV_CODEC_ID_ADPCM_4XM,
365 AV_CODEC_ID_ADPCM_XA,
366 AV_CODEC_ID_ADPCM_ADX,
367 AV_CODEC_ID_ADPCM_EA,
368 AV_CODEC_ID_ADPCM_G726,
369 AV_CODEC_ID_ADPCM_CT,
370 AV_CODEC_ID_ADPCM_SWF,
371 AV_CODEC_ID_ADPCM_YAMAHA,
372 AV_CODEC_ID_ADPCM_SBPRO_4,
373 AV_CODEC_ID_ADPCM_SBPRO_3,
374 AV_CODEC_ID_ADPCM_SBPRO_2,
375 AV_CODEC_ID_ADPCM_THP,
376 AV_CODEC_ID_ADPCM_IMA_AMV,
377 AV_CODEC_ID_ADPCM_EA_R1,
378 AV_CODEC_ID_ADPCM_EA_R3,
379 AV_CODEC_ID_ADPCM_EA_R2,
380 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
381 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
382 AV_CODEC_ID_ADPCM_EA_XAS,
383 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
384 AV_CODEC_ID_ADPCM_IMA_ISS,
385 AV_CODEC_ID_ADPCM_G722,
386 AV_CODEC_ID_ADPCM_IMA_APC,
387 AV_CODEC_ID_ADPCM_VIMA,
388 #if FF_API_VIMA_DECODER
389 AV_CODEC_ID_VIMA = AV_CODEC_ID_ADPCM_VIMA,
392 AV_CODEC_ID_ADPCM_AFC = 0x11800,
393 AV_CODEC_ID_ADPCM_IMA_OKI,
394 AV_CODEC_ID_ADPCM_DTK,
395 AV_CODEC_ID_ADPCM_IMA_RAD,
396 AV_CODEC_ID_ADPCM_G726LE,
397 AV_CODEC_ID_ADPCM_THP_LE,
398 AV_CODEC_ID_ADPCM_PSX,
401 AV_CODEC_ID_AMR_NB = 0x12000,
404 /* RealAudio codecs*/
405 AV_CODEC_ID_RA_144 = 0x13000,
408 /* various DPCM codecs */
409 AV_CODEC_ID_ROQ_DPCM = 0x14000,
410 AV_CODEC_ID_INTERPLAY_DPCM,
411 AV_CODEC_ID_XAN_DPCM,
412 AV_CODEC_ID_SOL_DPCM,
414 AV_CODEC_ID_SDX2_DPCM = 0x14800,
417 AV_CODEC_ID_MP2 = 0x15000,
418 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
428 AV_CODEC_ID_VMDAUDIO,
434 AV_CODEC_ID_WESTWOOD_SND1,
435 AV_CODEC_ID_GSM, ///< as in Berlin toast format
438 AV_CODEC_ID_TRUESPEECH,
440 AV_CODEC_ID_SMACKAUDIO,
443 AV_CODEC_ID_DSICINAUDIO,
445 AV_CODEC_ID_MUSEPACK7,
447 AV_CODEC_ID_GSM_MS, /* as found in WAV */
453 AV_CODEC_ID_NELLYMOSER,
454 AV_CODEC_ID_MUSEPACK8,
456 AV_CODEC_ID_WMAVOICE,
458 AV_CODEC_ID_WMALOSSLESS,
467 AV_CODEC_ID_BINKAUDIO_RDFT,
468 AV_CODEC_ID_BINKAUDIO_DCT,
469 AV_CODEC_ID_AAC_LATM,
474 AV_CODEC_ID_8SVX_EXP,
475 AV_CODEC_ID_8SVX_FIB,
476 AV_CODEC_ID_BMV_AUDIO,
481 AV_CODEC_ID_COMFORT_NOISE,
483 AV_CODEC_ID_METASOUND,
484 AV_CODEC_ID_PAF_AUDIO,
488 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
490 AV_CODEC_ID_SONIC_LS,
493 AV_CODEC_ID_DSD_LSBF,
494 AV_CODEC_ID_DSD_MSBF,
495 AV_CODEC_ID_DSD_LSBF_PLANAR,
496 AV_CODEC_ID_DSD_MSBF_PLANAR,
499 /* subtitle codecs */
500 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
501 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
502 AV_CODEC_ID_DVB_SUBTITLE,
503 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
506 AV_CODEC_ID_MOV_TEXT,
507 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
508 AV_CODEC_ID_DVB_TELETEXT,
511 AV_CODEC_ID_MICRODVD = 0x17800,
515 AV_CODEC_ID_REALTEXT,
517 AV_CODEC_ID_SUBVIEWER1,
518 AV_CODEC_ID_SUBVIEWER,
525 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
527 /* other specific kind of codecs (generally used for attachments) */
528 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
529 AV_CODEC_ID_TTF = 0x18000,
531 AV_CODEC_ID_BINTEXT = 0x18800,
535 AV_CODEC_ID_SMPTE_KLV,
537 AV_CODEC_ID_TIMED_ID3,
538 AV_CODEC_ID_BIN_DATA,
541 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
543 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
544 * stream (only used by libavformat) */
545 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
546 * stream (only used by libavformat) */
547 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
548 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
552 * This struct describes the properties of a single codec described by an
554 * @see avcodec_descriptor_get()
556 typedef struct AVCodecDescriptor {
558 enum AVMediaType type;
560 * Name of the codec described by this descriptor. It is non-empty and
561 * unique for each codec descriptor. It should contain alphanumeric
562 * characters and '_' only.
566 * A more descriptive name for this codec. May be NULL.
568 const char *long_name;
570 * Codec properties, a combination of AV_CODEC_PROP_* flags.
575 * MIME type(s) associated with the codec.
576 * May be NULL; if not, a NULL-terminated array of MIME types.
577 * The first item is always non-NULL and is the preferred MIME type.
579 const char *const *mime_types;
583 * Codec uses only intra compression.
586 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
588 * Codec supports lossy compression. Audio and video codecs only.
589 * @note a codec may support both lossy and lossless
592 #define AV_CODEC_PROP_LOSSY (1 << 1)
594 * Codec supports lossless compression. Audio and video codecs only.
596 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
598 * Codec supports frame reordering. That is, the coded order (the order in which
599 * the encoded packets are output by the encoders / stored / input to the
600 * decoders) may be different from the presentation order of the corresponding
603 * For codecs that do not have this property set, PTS and DTS should always be
606 #define AV_CODEC_PROP_REORDER (1 << 3)
608 * Subtitle codec is bitmap based
609 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
611 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
613 * Subtitle codec is text based.
614 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
616 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
619 * @ingroup lavc_decoding
620 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
621 * This is mainly needed because some optimized bitstream readers read
622 * 32 or 64 bit at once and could read over the end.<br>
623 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
624 * MPEG bitstreams could cause overread and segfault.
626 #define AV_INPUT_BUFFER_PADDING_SIZE 32
629 * @ingroup lavc_encoding
630 * minimum encoding buffer size
631 * Used to avoid some checks during header writing.
633 #define AV_INPUT_BUFFER_MIN_SIZE 16384
635 #if FF_API_WITHOUT_PREFIX
637 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
639 #define FF_INPUT_BUFFER_PADDING_SIZE 32
642 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
644 #define FF_MIN_BUFFER_SIZE 16384
645 #endif /* FF_API_WITHOUT_PREFIX */
648 * @ingroup lavc_encoding
649 * motion estimation type.
650 * @deprecated use codec private option instead
652 #if FF_API_MOTION_EST
654 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
658 ME_EPZS, ///< enhanced predictive zonal search
659 ME_X1, ///< reserved for experiments
660 ME_HEX, ///< hexagon based search
661 ME_UMH, ///< uneven multi-hexagon search
662 ME_TESA, ///< transformed exhaustive search algorithm
663 ME_ITER=50, ///< iterative search
668 * @ingroup lavc_decoding
671 /* We leave some space between them for extensions (drop some
672 * keyframes for intra-only or drop just some bidir frames). */
673 AVDISCARD_NONE =-16, ///< discard nothing
674 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
675 AVDISCARD_NONREF = 8, ///< discard all non reference
676 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
677 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
678 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
679 AVDISCARD_ALL = 48, ///< discard all
682 enum AVAudioServiceType {
683 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
684 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
685 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
686 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
687 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
688 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
689 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
690 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
691 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
692 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
696 * @ingroup lavc_encoding
698 typedef struct RcOverride{
701 int qscale; // If this is 0 then quality_factor will be used instead.
702 float quality_factor;
705 #if FF_API_MAX_BFRAMES
707 * @deprecated there is no libavcodec-wide limit on the number of B-frames
709 #define FF_MAX_B_FRAMES 16
713 These flags can be passed in AVCodecContext.flags before initialization.
714 Note: Not everything is supported yet.
718 * Allow decoders to produce frames with data planes that are not aligned
719 * to CPU requirements (e.g. due to cropping).
721 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
725 #define AV_CODEC_FLAG_QSCALE (1 << 1)
727 * 4 MV per MB allowed / advanced prediction for H.263.
729 #define AV_CODEC_FLAG_4MV (1 << 2)
731 * Output even those frames that might be corrupted.
733 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
737 #define AV_CODEC_FLAG_QPEL (1 << 4)
739 * Use internal 2pass ratecontrol in first pass mode.
741 #define AV_CODEC_FLAG_PASS1 (1 << 9)
743 * Use internal 2pass ratecontrol in second pass mode.
745 #define AV_CODEC_FLAG_PASS2 (1 << 10)
749 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
751 * Only decode/encode grayscale.
753 #define AV_CODEC_FLAG_GRAY (1 << 13)
755 * error[?] variables will be set during encoding.
757 #define AV_CODEC_FLAG_PSNR (1 << 15)
759 * Input bitstream might be truncated at a random location
760 * instead of only at frame boundaries.
762 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
764 * Use interlaced DCT.
766 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
770 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
772 * Place global headers in extradata instead of every keyframe.
774 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
776 * Use only bitexact stuff (except (I)DCT).
778 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
779 /* Fx : Flag for h263+ extra options */
781 * H.263 advanced intra coding / MPEG-4 AC prediction
783 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
785 * interlaced motion estimation
787 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
789 * Allow non spec compliant speedup tricks.
791 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
793 #define AV_CODEC_FLAG2_FAST (1 << 0)
795 * Skip bitstream encoding.
797 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
799 * Place global headers at every keyframe instead of in extradata.
801 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
804 * timecode is in drop frame format. DEPRECATED!!!!
806 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
809 * Input bitstream might be truncated at a packet boundaries
810 * instead of only at frame boundaries.
812 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
814 * Discard cropping information from SPS.
816 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
819 * Show all frames before the first keyframe
821 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
823 * Export motion vectors through frame side data
825 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
827 * Do not skip samples and export skip information as frame side data
829 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
831 /* Unsupported options :
832 * Syntax Arithmetic coding (SAC)
833 * Reference Picture Selection
834 * Independent Segment Decoding */
836 /* codec capabilities */
839 * Decoder can use draw_horiz_band callback.
841 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
843 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
844 * If not set, it might not use get_buffer() at all or use operations that
845 * assume the buffer was allocated by avcodec_default_get_buffer.
847 #define AV_CODEC_CAP_DR1 (1 << 1)
848 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
850 * Encoder or decoder requires flushing with NULL input at the end in order to
851 * give the complete and correct output.
853 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
854 * with NULL data. The user can still send NULL data to the public encode
855 * or decode function, but libavcodec will not pass it along to the codec
856 * unless this flag is set.
859 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
860 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
864 * The encoder needs to be fed with NULL data at the end of encoding until the
865 * encoder no longer returns data.
867 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
868 * flag also means that the encoder must set the pts and duration for
869 * each output packet. If this flag is not set, the pts and duration will
870 * be determined by libavcodec from the input frame.
872 #define AV_CODEC_CAP_DELAY (1 << 5)
874 * Codec can be fed a final frame with a smaller size.
875 * This can be used to prevent truncation of the last audio samples.
877 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
881 * Codec can export data for HW decoding (VDPAU).
883 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
887 * Codec can output multiple frames per AVPacket
888 * Normally demuxers return one frame at a time, demuxers which do not do
889 * are connected to a parser to split what they return into proper frames.
890 * This flag is reserved to the very rare category of codecs which have a
891 * bitstream that cannot be split into frames without timeconsuming
892 * operations like full decoding. Demuxers carring such bitstreams thus
893 * may return multiple frames in a packet. This has many disadvantages like
894 * prohibiting stream copy in many cases thus it should only be considered
897 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
899 * Codec is experimental and is thus avoided in favor of non experimental
902 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
904 * Codec should fill in channel configuration and samplerate instead of container
906 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
908 * Codec supports frame-level multithreading.
910 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
912 * Codec supports slice-based (or partition-based) multithreading.
914 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
916 * Codec supports changed parameters at any point.
918 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
920 * Codec supports avctx->thread_count == 0 (auto).
922 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
924 * Audio encoder supports receiving a different number of samples in each call.
926 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
928 * Codec is intra only.
930 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
934 #define AV_CODEC_CAP_LOSSLESS 0x80000000
937 #if FF_API_WITHOUT_PREFIX
939 * Allow decoders to produce frames with data planes that are not aligned
940 * to CPU requirements (e.g. due to cropping).
942 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
943 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
944 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
945 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
946 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
949 * @deprecated use the "gmc" private option of the libxvid encoder
951 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
955 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
958 #define CODEC_FLAG_MV0 0x0040
960 #if FF_API_INPUT_PRESERVED
962 * @deprecated passing reference-counted frames to the encoders replaces this
965 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
967 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
968 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
969 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
972 * @deprecated edges are not used/required anymore. I.e. this flag is now always
975 #define CODEC_FLAG_EMU_EDGE 0x4000
977 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
978 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
980 #if FF_API_NORMALIZE_AQP
982 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
985 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
987 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
988 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
989 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
990 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
991 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
992 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
993 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
994 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
995 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
996 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
997 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
998 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
999 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1001 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1002 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1003 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1004 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1006 /* Unsupported options :
1007 * Syntax Arithmetic coding (SAC)
1008 * Reference Picture Selection
1009 * Independent Segment Decoding */
1011 /* codec capabilities */
1013 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1015 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1016 * If not set, it might not use get_buffer() at all or use operations that
1017 * assume the buffer was allocated by avcodec_default_get_buffer.
1019 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1020 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1022 /* Codec can export data for HW decoding. This flag indicates that
1023 * the codec would call get_format() with list that might contain HW accelerated
1024 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1025 * including raw image format.
1026 * The application can use the passed context to determine bitstream version,
1027 * chroma format, resolution etc.
1029 #define CODEC_CAP_HWACCEL 0x0010
1030 #endif /* FF_API_XVMC */
1032 * Encoder or decoder requires flushing with NULL input at the end in order to
1033 * give the complete and correct output.
1035 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1036 * with NULL data. The user can still send NULL data to the public encode
1037 * or decode function, but libavcodec will not pass it along to the codec
1038 * unless this flag is set.
1041 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1042 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1046 * The encoder needs to be fed with NULL data at the end of encoding until the
1047 * encoder no longer returns data.
1049 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1050 * flag also means that the encoder must set the pts and duration for
1051 * each output packet. If this flag is not set, the pts and duration will
1052 * be determined by libavcodec from the input frame.
1054 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1056 * Codec can be fed a final frame with a smaller size.
1057 * This can be used to prevent truncation of the last audio samples.
1059 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1060 #if FF_API_CAP_VDPAU
1062 * Codec can export data for HW decoding (VDPAU).
1064 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1067 * Codec can output multiple frames per AVPacket
1068 * Normally demuxers return one frame at a time, demuxers which do not do
1069 * are connected to a parser to split what they return into proper frames.
1070 * This flag is reserved to the very rare category of codecs which have a
1071 * bitstream that cannot be split into frames without timeconsuming
1072 * operations like full decoding. Demuxers carring such bitstreams thus
1073 * may return multiple frames in a packet. This has many disadvantages like
1074 * prohibiting stream copy in many cases thus it should only be considered
1077 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1079 * Codec is experimental and is thus avoided in favor of non experimental
1082 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1084 * Codec should fill in channel configuration and samplerate instead of container
1086 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1087 #if FF_API_NEG_LINESIZES
1089 * @deprecated no codecs use this capability
1091 #define CODEC_CAP_NEG_LINESIZES 0x0800
1094 * Codec supports frame-level multithreading.
1096 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1098 * Codec supports slice-based (or partition-based) multithreading.
1100 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1102 * Codec supports changed parameters at any point.
1104 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1106 * Codec supports avctx->thread_count == 0 (auto).
1108 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1110 * Audio encoder supports receiving a different number of samples in each call.
1112 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1114 * Codec is intra only.
1116 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1118 * Codec is lossless.
1120 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1123 * HWAccel is experimental and is thus avoided in favor of non experimental
1126 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1127 #endif /* FF_API_WITHOUT_PREFIX */
1130 //The following defines may change, don't expect compatibility if you use them.
1131 #define MB_TYPE_INTRA4x4 0x0001
1132 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1133 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1134 #define MB_TYPE_16x16 0x0008
1135 #define MB_TYPE_16x8 0x0010
1136 #define MB_TYPE_8x16 0x0020
1137 #define MB_TYPE_8x8 0x0040
1138 #define MB_TYPE_INTERLACED 0x0080
1139 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1140 #define MB_TYPE_ACPRED 0x0200
1141 #define MB_TYPE_GMC 0x0400
1142 #define MB_TYPE_SKIP 0x0800
1143 #define MB_TYPE_P0L0 0x1000
1144 #define MB_TYPE_P1L0 0x2000
1145 #define MB_TYPE_P0L1 0x4000
1146 #define MB_TYPE_P1L1 0x8000
1147 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1148 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1149 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1150 #define MB_TYPE_QUANT 0x00010000
1151 #define MB_TYPE_CBP 0x00020000
1152 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1157 * This specifies the area which should be displayed.
1158 * Note there may be multiple such areas for one frame.
1160 typedef struct AVPanScan{
1163 * - encoding: Set by user.
1164 * - decoding: Set by libavcodec.
1169 * width and height in 1/16 pel
1170 * - encoding: Set by user.
1171 * - decoding: Set by libavcodec.
1177 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1178 * - encoding: Set by user.
1179 * - decoding: Set by libavcodec.
1181 int16_t position[3][2];
1184 #if FF_API_QSCALE_TYPE
1185 #define FF_QSCALE_TYPE_MPEG1 0
1186 #define FF_QSCALE_TYPE_MPEG2 1
1187 #define FF_QSCALE_TYPE_H264 2
1188 #define FF_QSCALE_TYPE_VP56 3
1192 * The decoder will keep a reference to the frame and may reuse it later.
1194 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1197 * @defgroup lavc_packet AVPacket
1199 * Types and functions for working with AVPacket.
1202 enum AVPacketSideDataType {
1203 AV_PKT_DATA_PALETTE,
1204 AV_PKT_DATA_NEW_EXTRADATA,
1207 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1210 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1211 * s32le channel_count
1212 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1213 * u64le channel_layout
1214 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1216 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1221 AV_PKT_DATA_PARAM_CHANGE,
1224 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1225 * structures with info about macroblocks relevant to splitting the
1226 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1227 * That is, it does not necessarily contain info about all macroblocks,
1228 * as long as the distance between macroblocks in the info is smaller
1229 * than the target payload size.
1230 * Each MB info structure is 12 bytes, and is laid out as follows:
1232 * u32le bit offset from the start of the packet
1233 * u8 current quantizer at the start of the macroblock
1235 * u16le macroblock address within the GOB
1236 * u8 horizontal MV predictor
1237 * u8 vertical MV predictor
1238 * u8 horizontal MV predictor for block number 3
1239 * u8 vertical MV predictor for block number 3
1242 AV_PKT_DATA_H263_MB_INFO,
1245 * This side data should be associated with an audio stream and contains
1246 * ReplayGain information in form of the AVReplayGain struct.
1248 AV_PKT_DATA_REPLAYGAIN,
1251 * This side data contains a 3x3 transformation matrix describing an affine
1252 * transformation that needs to be applied to the decoded video frames for
1253 * correct presentation.
1255 * See libavutil/display.h for a detailed description of the data.
1257 AV_PKT_DATA_DISPLAYMATRIX,
1260 * This side data should be associated with a video stream and contains
1261 * Stereoscopic 3D information in form of the AVStereo3D struct.
1263 AV_PKT_DATA_STEREO3D,
1266 * This side data should be associated with an audio stream and corresponds
1267 * to enum AVAudioServiceType.
1269 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1272 * This side data contains quality related information from the encoder.
1274 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1278 * u64le[error count] sum of squared differences between encoder in and output
1281 AV_PKT_DATA_QUALITY_STATS,
1284 * Recommmends skipping the specified number of samples
1286 * u32le number of samples to skip from start of this packet
1287 * u32le number of samples to skip from end of this packet
1288 * u8 reason for start skip
1289 * u8 reason for end skip (0=padding silence, 1=convergence)
1292 AV_PKT_DATA_SKIP_SAMPLES=70,
1295 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1296 * the packet may contain "dual mono" audio specific to Japanese DTV
1297 * and if it is true, recommends only the selected channel to be used.
1299 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1302 AV_PKT_DATA_JP_DUALMONO,
1305 * A list of zero terminated key/value strings. There is no end marker for
1306 * the list, so it is required to rely on the side data size to stop.
1308 AV_PKT_DATA_STRINGS_METADATA,
1311 * Subtitle event position
1319 AV_PKT_DATA_SUBTITLE_POSITION,
1322 * Data found in BlockAdditional element of matroska container. There is
1323 * no end marker for the data, so it is required to rely on the side data
1324 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1327 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1330 * The optional first identifier line of a WebVTT cue.
1332 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1335 * The optional settings (rendering instructions) that immediately
1336 * follow the timestamp specifier of a WebVTT cue.
1338 AV_PKT_DATA_WEBVTT_SETTINGS,
1341 * A list of zero terminated key/value strings. There is no end marker for
1342 * the list, so it is required to rely on the side data size to stop. This
1343 * side data includes updated metadata which appeared in the stream.
1345 AV_PKT_DATA_METADATA_UPDATE,
1348 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1350 typedef struct AVPacketSideData {
1353 enum AVPacketSideDataType type;
1357 * This structure stores compressed data. It is typically exported by demuxers
1358 * and then passed as input to decoders, or received as output from encoders and
1359 * then passed to muxers.
1361 * For video, it should typically contain one compressed frame. For audio it may
1362 * contain several compressed frames. Encoders are allowed to output empty
1363 * packets, with no compressed data, containing only side data
1364 * (e.g. to update some stream parameters at the end of encoding).
1366 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1367 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1368 * without libavcodec and libavformat major bump.
1370 * The semantics of data ownership depends on the buf or destruct (deprecated)
1371 * fields. If either is set, the packet data is dynamically allocated and is
1372 * valid indefinitely until av_free_packet() is called (which in turn calls
1373 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1374 * the packet data is typically backed by some static buffer somewhere and is
1375 * only valid for a limited time (e.g. until the next read call when demuxing).
1377 * The side data is always allocated with av_malloc() and is freed in
1380 typedef struct AVPacket {
1382 * A reference to the reference-counted buffer where the packet data is
1384 * May be NULL, then the packet data is not reference-counted.
1388 * Presentation timestamp in AVStream->time_base units; the time at which
1389 * the decompressed packet will be presented to the user.
1390 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1391 * pts MUST be larger or equal to dts as presentation cannot happen before
1392 * decompression, unless one wants to view hex dumps. Some formats misuse
1393 * the terms dts and pts/cts to mean something different. Such timestamps
1394 * must be converted to true pts/dts before they are stored in AVPacket.
1398 * Decompression timestamp in AVStream->time_base units; the time at which
1399 * the packet is decompressed.
1400 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1407 * A combination of AV_PKT_FLAG values
1411 * Additional packet data that can be provided by the container.
1412 * Packet can contain several types of side information.
1414 AVPacketSideData *side_data;
1415 int side_data_elems;
1418 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1419 * Equals next_pts - this_pts in presentation order.
1423 int64_t pos; ///< byte position in stream, -1 if unknown
1425 #if FF_API_CONVERGENCE_DURATION
1427 * @deprecated Same as the duration field, but as int64_t. This was required
1428 * for Matroska subtitles, whose duration values could overflow when the
1429 * duration field was still an int.
1431 attribute_deprecated
1432 int64_t convergence_duration;
1435 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1436 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1438 enum AVSideDataParamChangeFlags {
1439 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1440 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1441 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1442 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1448 struct AVCodecInternal;
1452 AV_FIELD_PROGRESSIVE,
1453 AV_FIELD_TT, //< Top coded_first, top displayed first
1454 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1455 AV_FIELD_TB, //< Top coded first, bottom displayed first
1456 AV_FIELD_BT, //< Bottom coded first, top displayed first
1460 * main external API structure.
1461 * New fields can be added to the end with minor version bumps.
1462 * Removal, reordering and changes to existing fields require a major
1464 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1466 * sizeof(AVCodecContext) must not be used outside libav*.
1468 typedef struct AVCodecContext {
1470 * information on struct for av_log
1471 * - set by avcodec_alloc_context3
1473 const AVClass *av_class;
1474 int log_level_offset;
1476 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1477 const struct AVCodec *codec;
1478 #if FF_API_CODEC_NAME
1480 * @deprecated this field is not used for anything in libavcodec
1482 attribute_deprecated
1483 char codec_name[32];
1485 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1488 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1489 * This is used to work around some encoder bugs.
1490 * A demuxer should set this to what is stored in the field used to identify the codec.
1491 * If there are multiple such fields in a container then the demuxer should choose the one
1492 * which maximizes the information about the used codec.
1493 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1494 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1495 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1497 * - encoding: Set by user, if not then the default based on codec_id will be used.
1498 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1500 unsigned int codec_tag;
1502 #if FF_API_STREAM_CODEC_TAG
1504 * @deprecated this field is unused
1506 attribute_deprecated
1507 unsigned int stream_codec_tag;
1513 * Private context used for internal data.
1515 * Unlike priv_data, this is not codec-specific. It is used in general
1516 * libavcodec functions.
1518 struct AVCodecInternal *internal;
1521 * Private data of the user, can be used to carry app specific stuff.
1522 * - encoding: Set by user.
1523 * - decoding: Set by user.
1528 * the average bitrate
1529 * - encoding: Set by user; unused for constant quantizer encoding.
1530 * - decoding: Set by user, may be overwritten by libavcodec
1531 * if this info is available in the stream
1536 * number of bits the bitstream is allowed to diverge from the reference.
1537 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1538 * - encoding: Set by user; unused for constant quantizer encoding.
1539 * - decoding: unused
1541 int bit_rate_tolerance;
1544 * Global quality for codecs which cannot change it per frame.
1545 * This should be proportional to MPEG-1/2/4 qscale.
1546 * - encoding: Set by user.
1547 * - decoding: unused
1552 * - encoding: Set by user.
1553 * - decoding: unused
1555 int compression_level;
1556 #define FF_COMPRESSION_DEFAULT -1
1560 * - encoding: Set by user.
1561 * - decoding: Set by user.
1567 * - encoding: Set by user.
1568 * - decoding: Set by user.
1573 * some codecs need / can use extradata like Huffman tables.
1574 * mjpeg: Huffman tables
1575 * rv10: additional flags
1576 * mpeg4: global headers (they can be in the bitstream or here)
1577 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1578 * than extradata_size to avoid problems if it is read with the bitstream reader.
1579 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1580 * - encoding: Set/allocated/freed by libavcodec.
1581 * - decoding: Set/allocated/freed by user.
1587 * This is the fundamental unit of time (in seconds) in terms
1588 * of which frame timestamps are represented. For fixed-fps content,
1589 * timebase should be 1/framerate and timestamp increments should be
1591 * This often, but not always is the inverse of the frame rate or field rate
1593 * - encoding: MUST be set by user.
1594 * - decoding: the use of this field for decoding is deprecated.
1595 * Use framerate instead.
1597 AVRational time_base;
1600 * For some codecs, the time base is closer to the field rate than the frame rate.
1601 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1602 * if no telecine is used ...
1604 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1606 int ticks_per_frame;
1611 * Encoding: Number of frames delay there will be from the encoder input to
1612 * the decoder output. (we assume the decoder matches the spec)
1613 * Decoding: Number of frames delay in addition to what a standard decoder
1614 * as specified in the spec would produce.
1617 * Number of frames the decoded output will be delayed relative to the
1621 * For encoding, this field is unused (see initial_padding).
1623 * For decoding, this is the number of samples the decoder needs to
1624 * output before the decoder's output is valid. When seeking, you should
1625 * start decoding this many samples prior to your desired seek point.
1627 * - encoding: Set by libavcodec.
1628 * - decoding: Set by libavcodec.
1635 * picture width / height.
1637 * @note Those fields may not match the values of the last
1638 * AVFrame outputted by avcodec_decode_video2 due frame
1641 * - encoding: MUST be set by user.
1642 * - decoding: May be set by the user before opening the decoder if known e.g.
1643 * from the container. Some decoders will require the dimensions
1644 * to be set by the caller. During decoding, the decoder may
1645 * overwrite those values as required while parsing the data.
1650 * Bitstream width / height, may be different from width/height e.g. when
1651 * the decoded frame is cropped before being output or lowres is enabled.
1653 * @note Those field may not match the value of the last
1654 * AVFrame outputted by avcodec_decode_video2 due frame
1657 * - encoding: unused
1658 * - decoding: May be set by the user before opening the decoder if known
1659 * e.g. from the container. During decoding, the decoder may
1660 * overwrite those values as required while parsing the data.
1662 int coded_width, coded_height;
1664 #if FF_API_ASPECT_EXTENDED
1665 #define FF_ASPECT_EXTENDED 15
1669 * the number of pictures in a group of pictures, or 0 for intra_only
1670 * - encoding: Set by user.
1671 * - decoding: unused
1676 * Pixel format, see AV_PIX_FMT_xxx.
1677 * May be set by the demuxer if known from headers.
1678 * May be overridden by the decoder if it knows better.
1680 * @note This field may not match the value of the last
1681 * AVFrame outputted by avcodec_decode_video2 due frame
1684 * - encoding: Set by user.
1685 * - decoding: Set by user if known, overridden by libavcodec while
1688 enum AVPixelFormat pix_fmt;
1690 #if FF_API_MOTION_EST
1692 * This option does nothing
1693 * @deprecated use codec private options instead
1695 attribute_deprecated int me_method;
1699 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1700 * decoder to draw a horizontal band. It improves cache usage. Not
1701 * all codecs can do that. You must check the codec capabilities
1703 * When multithreading is used, it may be called from multiple threads
1704 * at the same time; threads might draw different parts of the same AVFrame,
1705 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1707 * The function is also used by hardware acceleration APIs.
1708 * It is called at least once during frame decoding to pass
1709 * the data needed for hardware render.
1710 * In that mode instead of pixel data, AVFrame points to
1711 * a structure specific to the acceleration API. The application
1712 * reads the structure and can change some fields to indicate progress
1714 * - encoding: unused
1715 * - decoding: Set by user.
1716 * @param height the height of the slice
1717 * @param y the y position of the slice
1718 * @param type 1->top field, 2->bottom field, 3->frame
1719 * @param offset offset into the AVFrame.data from which the slice should be read
1721 void (*draw_horiz_band)(struct AVCodecContext *s,
1722 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1723 int y, int type, int height);
1726 * callback to negotiate the pixelFormat
1727 * @param fmt is the list of formats which are supported by the codec,
1728 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1729 * The first is always the native one.
1730 * @note The callback may be called again immediately if initialization for
1731 * the selected (hardware-accelerated) pixel format failed.
1732 * @warning Behavior is undefined if the callback returns a value not
1733 * in the fmt list of formats.
1734 * @return the chosen format
1735 * - encoding: unused
1736 * - decoding: Set by user, if not set the native format will be chosen.
1738 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1741 * maximum number of B-frames between non-B-frames
1742 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1743 * - encoding: Set by user.
1744 * - decoding: unused
1749 * qscale factor between IP and B-frames
1750 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1751 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1752 * - encoding: Set by user.
1753 * - decoding: unused
1755 float b_quant_factor;
1757 #if FF_API_RC_STRATEGY
1758 /** @deprecated use codec private option instead */
1759 attribute_deprecated int rc_strategy;
1760 #define FF_RC_STRATEGY_XVID 1
1763 int b_frame_strategy;
1766 * qscale offset between IP and B-frames
1767 * - encoding: Set by user.
1768 * - decoding: unused
1770 float b_quant_offset;
1773 * Size of the frame reordering buffer in the decoder.
1774 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1775 * - encoding: Set by libavcodec.
1776 * - decoding: Set by libavcodec.
1781 * 0-> h263 quant 1-> mpeg quant
1782 * - encoding: Set by user.
1783 * - decoding: unused
1788 * qscale factor between P and I-frames
1789 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1790 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1791 * - encoding: Set by user.
1792 * - decoding: unused
1794 float i_quant_factor;
1797 * qscale offset between P and I-frames
1798 * - encoding: Set by user.
1799 * - decoding: unused
1801 float i_quant_offset;
1804 * luminance masking (0-> disabled)
1805 * - encoding: Set by user.
1806 * - decoding: unused
1811 * temporary complexity masking (0-> disabled)
1812 * - encoding: Set by user.
1813 * - decoding: unused
1815 float temporal_cplx_masking;
1818 * spatial complexity masking (0-> disabled)
1819 * - encoding: Set by user.
1820 * - decoding: unused
1822 float spatial_cplx_masking;
1825 * p block masking (0-> disabled)
1826 * - encoding: Set by user.
1827 * - decoding: unused
1832 * darkness masking (0-> disabled)
1833 * - encoding: Set by user.
1834 * - decoding: unused
1840 * - encoding: Set by libavcodec.
1841 * - decoding: Set by user (or 0).
1845 * prediction method (needed for huffyuv)
1846 * - encoding: Set by user.
1847 * - decoding: unused
1849 int prediction_method;
1850 #define FF_PRED_LEFT 0
1851 #define FF_PRED_PLANE 1
1852 #define FF_PRED_MEDIAN 2
1855 * slice offsets in the frame in bytes
1856 * - encoding: Set/allocated by libavcodec.
1857 * - decoding: Set/allocated by user (or NULL).
1862 * sample aspect ratio (0 if unknown)
1863 * That is the width of a pixel divided by the height of the pixel.
1864 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1865 * - encoding: Set by user.
1866 * - decoding: Set by libavcodec.
1868 AVRational sample_aspect_ratio;
1871 * motion estimation comparison function
1872 * - encoding: Set by user.
1873 * - decoding: unused
1877 * subpixel motion estimation comparison function
1878 * - encoding: Set by user.
1879 * - decoding: unused
1883 * macroblock comparison function (not supported yet)
1884 * - encoding: Set by user.
1885 * - decoding: unused
1889 * interlaced DCT comparison function
1890 * - encoding: Set by user.
1891 * - decoding: unused
1894 #define FF_CMP_SAD 0
1895 #define FF_CMP_SSE 1
1896 #define FF_CMP_SATD 2
1897 #define FF_CMP_DCT 3
1898 #define FF_CMP_PSNR 4
1899 #define FF_CMP_BIT 5
1901 #define FF_CMP_ZERO 7
1902 #define FF_CMP_VSAD 8
1903 #define FF_CMP_VSSE 9
1904 #define FF_CMP_NSSE 10
1905 #define FF_CMP_W53 11
1906 #define FF_CMP_W97 12
1907 #define FF_CMP_DCTMAX 13
1908 #define FF_CMP_DCT264 14
1909 #define FF_CMP_CHROMA 256
1912 * ME diamond size & shape
1913 * - encoding: Set by user.
1914 * - decoding: unused
1919 * amount of previous MV predictors (2a+1 x 2a+1 square)
1920 * - encoding: Set by user.
1921 * - decoding: unused
1923 int last_predictor_count;
1926 * prepass for motion estimation
1927 * - encoding: Set by user.
1928 * - decoding: unused
1933 * motion estimation prepass comparison function
1934 * - encoding: Set by user.
1935 * - decoding: unused
1940 * ME prepass diamond size & shape
1941 * - encoding: Set by user.
1942 * - decoding: unused
1948 * - encoding: Set by user.
1949 * - decoding: unused
1951 int me_subpel_quality;
1955 * DTG active format information (additional aspect ratio
1956 * information only used in DVB MPEG-2 transport streams)
1959 * - encoding: unused
1960 * - decoding: Set by decoder.
1961 * @deprecated Deprecated in favor of AVSideData
1963 attribute_deprecated int dtg_active_format;
1964 #define FF_DTG_AFD_SAME 8
1965 #define FF_DTG_AFD_4_3 9
1966 #define FF_DTG_AFD_16_9 10
1967 #define FF_DTG_AFD_14_9 11
1968 #define FF_DTG_AFD_4_3_SP_14_9 13
1969 #define FF_DTG_AFD_16_9_SP_14_9 14
1970 #define FF_DTG_AFD_SP_4_3 15
1971 #endif /* FF_API_AFD */
1974 * maximum motion estimation search range in subpel units
1975 * If 0 then no limit.
1977 * - encoding: Set by user.
1978 * - decoding: unused
1982 #if FF_API_QUANT_BIAS
1984 * @deprecated use encoder private option instead
1986 attribute_deprecated int intra_quant_bias;
1987 #define FF_DEFAULT_QUANT_BIAS 999999
1990 * @deprecated use encoder private option instead
1992 attribute_deprecated int inter_quant_bias;
1997 * - encoding: unused
1998 * - decoding: Set by user.
2001 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2002 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2003 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2007 * XVideo Motion Acceleration
2008 * - encoding: forbidden
2009 * - decoding: set by decoder
2010 * @deprecated XvMC doesn't need it anymore.
2012 attribute_deprecated int xvmc_acceleration;
2013 #endif /* FF_API_XVMC */
2016 * macroblock decision mode
2017 * - encoding: Set by user.
2018 * - decoding: unused
2021 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2022 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2023 #define FF_MB_DECISION_RD 2 ///< rate distortion
2026 * custom intra quantization matrix
2027 * - encoding: Set by user, can be NULL.
2028 * - decoding: Set by libavcodec.
2030 uint16_t *intra_matrix;
2033 * custom inter quantization matrix
2034 * - encoding: Set by user, can be NULL.
2035 * - decoding: Set by libavcodec.
2037 uint16_t *inter_matrix;
2040 * scene change detection threshold
2041 * 0 is default, larger means fewer detected scene changes.
2042 * - encoding: Set by user.
2043 * - decoding: unused
2045 int scenechange_threshold;
2048 * noise reduction strength
2049 * - encoding: Set by user.
2050 * - decoding: unused
2052 int noise_reduction;
2056 * @deprecated this field is unused
2058 attribute_deprecated
2062 * @deprecated this field is unused
2064 attribute_deprecated
2069 * precision of the intra DC coefficient - 8
2070 * - encoding: Set by user.
2071 * - decoding: Set by libavcodec
2073 int intra_dc_precision;
2076 * Number of macroblock rows at the top which are skipped.
2077 * - encoding: unused
2078 * - decoding: Set by user.
2083 * Number of macroblock rows at the bottom which are skipped.
2084 * - encoding: unused
2085 * - decoding: Set by user.
2091 * @deprecated use encoder private options instead
2093 attribute_deprecated
2094 float border_masking;
2098 * minimum MB lagrange multipler
2099 * - encoding: Set by user.
2100 * - decoding: unused
2105 * maximum MB lagrange multipler
2106 * - encoding: Set by user.
2107 * - decoding: unused
2113 * - encoding: Set by user.
2114 * - decoding: unused
2116 int me_penalty_compensation;
2120 * - encoding: Set by user.
2121 * - decoding: unused
2127 * - encoding: Set by user.
2128 * - decoding: unused
2134 * - encoding: Set by user.
2135 * - decoding: unused
2140 * number of reference frames
2141 * - encoding: Set by user.
2142 * - decoding: Set by lavc.
2147 * chroma qp offset from luma
2148 * - encoding: Set by user.
2149 * - decoding: unused
2153 #if FF_API_UNUSED_MEMBERS
2155 * Multiplied by qscale for each frame and added to scene_change_score.
2156 * - encoding: Set by user.
2157 * - decoding: unused
2159 attribute_deprecated int scenechange_factor;
2164 * Note: Value depends upon the compare function used for fullpel ME.
2165 * - encoding: Set by user.
2166 * - decoding: unused
2171 * Adjust sensitivity of b_frame_strategy 1.
2172 * - encoding: Set by user.
2173 * - decoding: unused
2178 * Chromaticity coordinates of the source primaries.
2179 * - encoding: Set by user
2180 * - decoding: Set by libavcodec
2182 enum AVColorPrimaries color_primaries;
2185 * Color Transfer Characteristic.
2186 * - encoding: Set by user
2187 * - decoding: Set by libavcodec
2189 enum AVColorTransferCharacteristic color_trc;
2192 * YUV colorspace type.
2193 * - encoding: Set by user
2194 * - decoding: Set by libavcodec
2196 enum AVColorSpace colorspace;
2199 * MPEG vs JPEG YUV range.
2200 * - encoding: Set by user
2201 * - decoding: Set by libavcodec
2203 enum AVColorRange color_range;
2206 * This defines the location of chroma samples.
2207 * - encoding: Set by user
2208 * - decoding: Set by libavcodec
2210 enum AVChromaLocation chroma_sample_location;
2214 * Indicates number of picture subdivisions. Used for parallelized
2216 * - encoding: Set by user
2217 * - decoding: unused
2222 * - encoding: set by libavcodec
2223 * - decoding: Set by user.
2225 enum AVFieldOrder field_order;
2228 int sample_rate; ///< samples per second
2229 int channels; ///< number of audio channels
2232 * audio sample format
2233 * - encoding: Set by user.
2234 * - decoding: Set by libavcodec.
2236 enum AVSampleFormat sample_fmt; ///< sample format
2238 /* The following data should not be initialized. */
2240 * Number of samples per channel in an audio frame.
2242 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2243 * except the last must contain exactly frame_size samples per channel.
2244 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2245 * frame size is not restricted.
2246 * - decoding: may be set by some decoders to indicate constant frame size
2251 * Frame counter, set by libavcodec.
2253 * - decoding: total number of frames returned from the decoder so far.
2254 * - encoding: total number of frames passed to the encoder so far.
2256 * @note the counter is not incremented if encoding/decoding resulted in
2262 * number of bytes per packet if constant and known or 0
2263 * Used by some WAV based audio codecs.
2268 * Audio cutoff bandwidth (0 means "automatic")
2269 * - encoding: Set by user.
2270 * - decoding: unused
2275 * Audio channel layout.
2276 * - encoding: set by user.
2277 * - decoding: set by user, may be overwritten by libavcodec.
2279 uint64_t channel_layout;
2282 * Request decoder to use this channel layout if it can (0 for default)
2283 * - encoding: unused
2284 * - decoding: Set by user.
2286 uint64_t request_channel_layout;
2289 * Type of service that the audio stream conveys.
2290 * - encoding: Set by user.
2291 * - decoding: Set by libavcodec.
2293 enum AVAudioServiceType audio_service_type;
2296 * desired sample format
2297 * - encoding: Not used.
2298 * - decoding: Set by user.
2299 * Decoder will decode to this format if it can.
2301 enum AVSampleFormat request_sample_fmt;
2304 * This callback is called at the beginning of each frame to get data
2305 * buffer(s) for it. There may be one contiguous buffer for all the data or
2306 * there may be a buffer per each data plane or anything in between. What
2307 * this means is, you may set however many entries in buf[] you feel necessary.
2308 * Each buffer must be reference-counted using the AVBuffer API (see description
2311 * The following fields will be set in the frame before this callback is
2314 * - width, height (video only)
2315 * - sample_rate, channel_layout, nb_samples (audio only)
2316 * Their values may differ from the corresponding values in
2317 * AVCodecContext. This callback must use the frame values, not the codec
2318 * context values, to calculate the required buffer size.
2320 * This callback must fill the following fields in the frame:
2324 * * if the data is planar audio with more than 8 channels, then this
2325 * callback must allocate and fill extended_data to contain all pointers
2326 * to all data planes. data[] must hold as many pointers as it can.
2327 * extended_data must be allocated with av_malloc() and will be freed in
2329 * * otherwise exended_data must point to data
2330 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2331 * the frame's data and extended_data pointers must be contained in these. That
2332 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2333 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2334 * and av_buffer_ref().
2335 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2336 * this callback and filled with the extra buffers if there are more
2337 * buffers than buf[] can hold. extended_buf will be freed in
2340 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2341 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2344 * Each data plane must be aligned to the maximum required by the target
2347 * @see avcodec_default_get_buffer2()
2351 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2352 * (read and/or written to if it is writable) later by libavcodec.
2354 * avcodec_align_dimensions2() should be used to find the required width and
2355 * height, as they normally need to be rounded up to the next multiple of 16.
2357 * Some decoders do not support linesizes changing between frames.
2359 * If frame multithreading is used and thread_safe_callbacks is set,
2360 * this callback may be called from a different thread, but not from more
2361 * than one at once. Does not need to be reentrant.
2363 * @see avcodec_align_dimensions2()
2367 * Decoders request a buffer of a particular size by setting
2368 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2369 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2370 * to a smaller value in the output frame.
2372 * As a convenience, av_samples_get_buffer_size() and
2373 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2374 * functions to find the required data size and to fill data pointers and
2375 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2376 * since all planes must be the same size.
2378 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2380 * - encoding: unused
2381 * - decoding: Set by libavcodec, user can override.
2383 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2386 * If non-zero, the decoded audio and video frames returned from
2387 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2388 * and are valid indefinitely. The caller must free them with
2389 * av_frame_unref() when they are not needed anymore.
2390 * Otherwise, the decoded frames must not be freed by the caller and are
2391 * only valid until the next decode call.
2393 * - encoding: unused
2394 * - decoding: set by the caller before avcodec_open2().
2396 int refcounted_frames;
2398 /* - encoding parameters */
2399 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2400 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2404 * - encoding: Set by user.
2405 * - decoding: unused
2411 * - encoding: Set by user.
2412 * - decoding: unused
2417 * maximum quantizer difference between frames
2418 * - encoding: Set by user.
2419 * - decoding: unused
2425 * @deprecated use encoder private options instead
2427 attribute_deprecated
2430 attribute_deprecated
2432 attribute_deprecated
2437 * decoder bitstream buffer size
2438 * - encoding: Set by user.
2439 * - decoding: unused
2444 * ratecontrol override, see RcOverride
2445 * - encoding: Allocated/set/freed by user.
2446 * - decoding: unused
2448 int rc_override_count;
2449 RcOverride *rc_override;
2453 * @deprecated use encoder private options instead
2455 attribute_deprecated
2461 * - encoding: Set by user.
2462 * - decoding: Set by user, may be overwritten by libavcodec.
2464 int64_t rc_max_rate;
2468 * - encoding: Set by user.
2469 * - decoding: unused
2471 int64_t rc_min_rate;
2475 * @deprecated use encoder private options instead
2477 attribute_deprecated
2478 float rc_buffer_aggressivity;
2480 attribute_deprecated
2481 float rc_initial_cplx;
2485 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2486 * - encoding: Set by user.
2487 * - decoding: unused.
2489 float rc_max_available_vbv_use;
2492 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2493 * - encoding: Set by user.
2494 * - decoding: unused.
2496 float rc_min_vbv_overflow_use;
2499 * Number of bits which should be loaded into the rc buffer before decoding starts.
2500 * - encoding: Set by user.
2501 * - decoding: unused
2503 int rc_initial_buffer_occupancy;
2505 #define FF_CODER_TYPE_VLC 0
2506 #define FF_CODER_TYPE_AC 1
2507 #define FF_CODER_TYPE_RAW 2
2508 #define FF_CODER_TYPE_RLE 3
2509 #if FF_API_UNUSED_MEMBERS
2510 #define FF_CODER_TYPE_DEFLATE 4
2511 #endif /* FF_API_UNUSED_MEMBERS */
2514 * - encoding: Set by user.
2515 * - decoding: unused
2521 * - encoding: Set by user.
2522 * - decoding: unused
2528 * @deprecated use encoder private options instead
2530 attribute_deprecated
2534 * @deprecated use encoder private options instead
2536 attribute_deprecated
2541 * frame skip threshold
2542 * - encoding: Set by user.
2543 * - decoding: unused
2545 int frame_skip_threshold;
2549 * - encoding: Set by user.
2550 * - decoding: unused
2552 int frame_skip_factor;
2555 * frame skip exponent
2556 * - encoding: Set by user.
2557 * - decoding: unused
2562 * frame skip comparison function
2563 * - encoding: Set by user.
2564 * - decoding: unused
2569 * trellis RD quantization
2570 * - encoding: Set by user.
2571 * - decoding: unused
2576 * - encoding: Set by user.
2577 * - decoding: unused
2579 int min_prediction_order;
2582 * - encoding: Set by user.
2583 * - decoding: unused
2585 int max_prediction_order;
2588 * GOP timecode frame start number
2589 * - encoding: Set by user, in non drop frame format
2590 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2592 int64_t timecode_frame_start;
2594 /* The RTP callback: This function is called */
2595 /* every time the encoder has a packet to send. */
2596 /* It depends on the encoder if the data starts */
2597 /* with a Start Code (it should). H.263 does. */
2598 /* mb_nb contains the number of macroblocks */
2599 /* encoded in the RTP payload. */
2600 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2602 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2603 /* do its best to deliver a chunk with size */
2604 /* below rtp_payload_size, the chunk will start */
2605 /* with a start code on some codecs like H.263. */
2606 /* This doesn't take account of any particular */
2607 /* headers inside the transmitted RTP payload. */
2609 /* statistics, used for 2-pass encoding */
2620 * number of bits used for the previously encoded frame
2621 * - encoding: Set by libavcodec.
2622 * - decoding: unused
2627 * pass1 encoding statistics output buffer
2628 * - encoding: Set by libavcodec.
2629 * - decoding: unused
2634 * pass2 encoding statistics input buffer
2635 * Concatenated stuff from stats_out of pass1 should be placed here.
2636 * - encoding: Allocated/set/freed by user.
2637 * - decoding: unused
2642 * Work around bugs in encoders which sometimes cannot be detected automatically.
2643 * - encoding: Set by user
2644 * - decoding: Set by user
2646 int workaround_bugs;
2647 #define FF_BUG_AUTODETECT 1 ///< autodetection
2648 #if FF_API_OLD_MSMPEG4
2649 #define FF_BUG_OLD_MSMPEG4 2
2651 #define FF_BUG_XVID_ILACE 4
2652 #define FF_BUG_UMP4 8
2653 #define FF_BUG_NO_PADDING 16
2654 #define FF_BUG_AMV 32
2656 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2658 #define FF_BUG_QPEL_CHROMA 64
2659 #define FF_BUG_STD_QPEL 128
2660 #define FF_BUG_QPEL_CHROMA2 256
2661 #define FF_BUG_DIRECT_BLOCKSIZE 512
2662 #define FF_BUG_EDGE 1024
2663 #define FF_BUG_HPEL_CHROMA 2048
2664 #define FF_BUG_DC_CLIP 4096
2665 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2666 #define FF_BUG_TRUNCATED 16384
2669 * strictly follow the standard (MPEG4, ...).
2670 * - encoding: Set by user.
2671 * - decoding: Set by user.
2672 * Setting this to STRICT or higher means the encoder and decoder will
2673 * generally do stupid things, whereas setting it to unofficial or lower
2674 * will mean the encoder might produce output that is not supported by all
2675 * spec-compliant decoders. Decoders don't differentiate between normal,
2676 * unofficial and experimental (that is, they always try to decode things
2677 * when they can) unless they are explicitly asked to behave stupidly
2678 * (=strictly conform to the specs)
2680 int strict_std_compliance;
2681 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2682 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2683 #define FF_COMPLIANCE_NORMAL 0
2684 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2685 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2688 * error concealment flags
2689 * - encoding: unused
2690 * - decoding: Set by user.
2692 int error_concealment;
2693 #define FF_EC_GUESS_MVS 1
2694 #define FF_EC_DEBLOCK 2
2695 #define FF_EC_FAVOR_INTER 256
2699 * - encoding: Set by user.
2700 * - decoding: Set by user.
2703 #define FF_DEBUG_PICT_INFO 1
2704 #define FF_DEBUG_RC 2
2705 #define FF_DEBUG_BITSTREAM 4
2706 #define FF_DEBUG_MB_TYPE 8
2707 #define FF_DEBUG_QP 16
2710 * @deprecated this option does nothing
2712 #define FF_DEBUG_MV 32
2714 #define FF_DEBUG_DCT_COEFF 0x00000040
2715 #define FF_DEBUG_SKIP 0x00000080
2716 #define FF_DEBUG_STARTCODE 0x00000100
2717 #if FF_API_UNUSED_MEMBERS
2718 #define FF_DEBUG_PTS 0x00000200
2719 #endif /* FF_API_UNUSED_MEMBERS */
2720 #define FF_DEBUG_ER 0x00000400
2721 #define FF_DEBUG_MMCO 0x00000800
2722 #define FF_DEBUG_BUGS 0x00001000
2724 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2725 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2727 #define FF_DEBUG_BUFFERS 0x00008000
2728 #define FF_DEBUG_THREADS 0x00010000
2729 #define FF_DEBUG_GREEN_MD 0x00800000
2730 #define FF_DEBUG_NOMC 0x01000000
2735 * Code outside libavcodec should access this field using AVOptions
2736 * - encoding: Set by user.
2737 * - decoding: Set by user.
2740 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2741 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2742 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2746 * Error recognition; may misdetect some more or less valid parts as errors.
2747 * - encoding: unused
2748 * - decoding: Set by user.
2750 int err_recognition;
2753 * Verify checksums embedded in the bitstream (could be of either encoded or
2754 * decoded data, depending on the codec) and print an error message on mismatch.
2755 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2756 * decoder returning an error.
2758 #define AV_EF_CRCCHECK (1<<0)
2759 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2760 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2761 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2763 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2764 #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
2765 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2766 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2770 * opaque 64bit number (generally a PTS) that will be reordered and
2771 * output in AVFrame.reordered_opaque
2772 * - encoding: unused
2773 * - decoding: Set by user.
2775 int64_t reordered_opaque;
2778 * Hardware accelerator in use
2779 * - encoding: unused.
2780 * - decoding: Set by libavcodec
2782 struct AVHWAccel *hwaccel;
2785 * Hardware accelerator context.
2786 * For some hardware accelerators, a global context needs to be
2787 * provided by the user. In that case, this holds display-dependent
2788 * data FFmpeg cannot instantiate itself. Please refer to the
2789 * FFmpeg HW accelerator documentation to know how to fill this
2790 * is. e.g. for VA API, this is a struct vaapi_context.
2791 * - encoding: unused
2792 * - decoding: Set by user
2794 void *hwaccel_context;
2798 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2799 * - decoding: unused
2801 uint64_t error[AV_NUM_DATA_POINTERS];
2804 * DCT algorithm, see FF_DCT_* below
2805 * - encoding: Set by user.
2806 * - decoding: unused
2809 #define FF_DCT_AUTO 0
2810 #define FF_DCT_FASTINT 1
2811 #define FF_DCT_INT 2
2812 #define FF_DCT_MMX 3
2813 #define FF_DCT_ALTIVEC 5
2814 #define FF_DCT_FAAN 6
2817 * IDCT algorithm, see FF_IDCT_* below.
2818 * - encoding: Set by user.
2819 * - decoding: Set by user.
2822 #define FF_IDCT_AUTO 0
2823 #define FF_IDCT_INT 1
2824 #define FF_IDCT_SIMPLE 2
2825 #define FF_IDCT_SIMPLEMMX 3
2826 #define FF_IDCT_ARM 7
2827 #define FF_IDCT_ALTIVEC 8
2829 #define FF_IDCT_SH4 9
2831 #define FF_IDCT_SIMPLEARM 10
2832 #if FF_API_UNUSED_MEMBERS
2833 #define FF_IDCT_IPP 13
2834 #endif /* FF_API_UNUSED_MEMBERS */
2835 #define FF_IDCT_XVID 14
2836 #if FF_API_IDCT_XVIDMMX
2837 #define FF_IDCT_XVIDMMX 14
2838 #endif /* FF_API_IDCT_XVIDMMX */
2839 #define FF_IDCT_SIMPLEARMV5TE 16
2840 #define FF_IDCT_SIMPLEARMV6 17
2841 #if FF_API_ARCH_SPARC
2842 #define FF_IDCT_SIMPLEVIS 18
2844 #define FF_IDCT_FAAN 20
2845 #define FF_IDCT_SIMPLENEON 22
2846 #if FF_API_ARCH_ALPHA
2847 #define FF_IDCT_SIMPLEALPHA 23
2849 #define FF_IDCT_SIMPLEAUTO 128
2852 * bits per sample/pixel from the demuxer (needed for huffyuv).
2853 * - encoding: Set by libavcodec.
2854 * - decoding: Set by user.
2856 int bits_per_coded_sample;
2859 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2860 * - encoding: set by user.
2861 * - decoding: set by libavcodec.
2863 int bits_per_raw_sample;
2867 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2868 * - encoding: unused
2869 * - decoding: Set by user.
2870 * Code outside libavcodec should access this field using:
2871 * av_codec_{get,set}_lowres(avctx)
2876 #if FF_API_CODED_FRAME
2878 * the picture in the bitstream
2879 * - encoding: Set by libavcodec.
2880 * - decoding: unused
2882 * @deprecated use the quality factor packet side data instead
2884 attribute_deprecated AVFrame *coded_frame;
2889 * is used to decide how many independent tasks should be passed to execute()
2890 * - encoding: Set by user.
2891 * - decoding: Set by user.
2896 * Which multithreading methods to use.
2897 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2898 * so clients which cannot provide future frames should not use it.
2900 * - encoding: Set by user, otherwise the default is used.
2901 * - decoding: Set by user, otherwise the default is used.
2904 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2905 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2908 * Which multithreading methods are in use by the codec.
2909 * - encoding: Set by libavcodec.
2910 * - decoding: Set by libavcodec.
2912 int active_thread_type;
2915 * Set by the client if its custom get_buffer() callback can be called
2916 * synchronously from another thread, which allows faster multithreaded decoding.
2917 * draw_horiz_band() will be called from other threads regardless of this setting.
2918 * Ignored if the default get_buffer() is used.
2919 * - encoding: Set by user.
2920 * - decoding: Set by user.
2922 int thread_safe_callbacks;
2925 * The codec may call this to execute several independent things.
2926 * It will return only after finishing all tasks.
2927 * The user may replace this with some multithreaded implementation,
2928 * the default implementation will execute the parts serially.
2929 * @param count the number of things to execute
2930 * - encoding: Set by libavcodec, user can override.
2931 * - decoding: Set by libavcodec, user can override.
2933 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2936 * The codec may call this to execute several independent things.
2937 * It will return only after finishing all tasks.
2938 * The user may replace this with some multithreaded implementation,
2939 * the default implementation will execute the parts serially.
2940 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2941 * @param c context passed also to func
2942 * @param count the number of things to execute
2943 * @param arg2 argument passed unchanged to func
2944 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2945 * @param func function that will be called count times, with jobnr from 0 to count-1.
2946 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2947 * two instances of func executing at the same time will have the same threadnr.
2948 * @return always 0 currently, but code should handle a future improvement where when any call to func
2949 * returns < 0 no further calls to func may be done and < 0 is returned.
2950 * - encoding: Set by libavcodec, user can override.
2951 * - decoding: Set by libavcodec, user can override.
2953 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2956 * noise vs. sse weight for the nsse comparison function
2957 * - encoding: Set by user.
2958 * - decoding: unused
2964 * - encoding: Set by user.
2965 * - decoding: Set by libavcodec.
2968 #define FF_PROFILE_UNKNOWN -99
2969 #define FF_PROFILE_RESERVED -100
2971 #define FF_PROFILE_AAC_MAIN 0
2972 #define FF_PROFILE_AAC_LOW 1
2973 #define FF_PROFILE_AAC_SSR 2
2974 #define FF_PROFILE_AAC_LTP 3
2975 #define FF_PROFILE_AAC_HE 4
2976 #define FF_PROFILE_AAC_HE_V2 28
2977 #define FF_PROFILE_AAC_LD 22
2978 #define FF_PROFILE_AAC_ELD 38
2979 #define FF_PROFILE_MPEG2_AAC_LOW 128
2980 #define FF_PROFILE_MPEG2_AAC_HE 131
2982 #define FF_PROFILE_DTS 20
2983 #define FF_PROFILE_DTS_ES 30
2984 #define FF_PROFILE_DTS_96_24 40
2985 #define FF_PROFILE_DTS_HD_HRA 50
2986 #define FF_PROFILE_DTS_HD_MA 60
2987 #define FF_PROFILE_DTS_EXPRESS 70
2989 #define FF_PROFILE_MPEG2_422 0
2990 #define FF_PROFILE_MPEG2_HIGH 1
2991 #define FF_PROFILE_MPEG2_SS 2
2992 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2993 #define FF_PROFILE_MPEG2_MAIN 4
2994 #define FF_PROFILE_MPEG2_SIMPLE 5
2996 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2997 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2999 #define FF_PROFILE_H264_BASELINE 66
3000 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3001 #define FF_PROFILE_H264_MAIN 77
3002 #define FF_PROFILE_H264_EXTENDED 88
3003 #define FF_PROFILE_H264_HIGH 100
3004 #define FF_PROFILE_H264_HIGH_10 110
3005 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3006 #define FF_PROFILE_H264_HIGH_422 122
3007 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3008 #define FF_PROFILE_H264_HIGH_444 144
3009 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3010 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3011 #define FF_PROFILE_H264_CAVLC_444 44
3013 #define FF_PROFILE_VC1_SIMPLE 0
3014 #define FF_PROFILE_VC1_MAIN 1
3015 #define FF_PROFILE_VC1_COMPLEX 2
3016 #define FF_PROFILE_VC1_ADVANCED 3
3018 #define FF_PROFILE_MPEG4_SIMPLE 0
3019 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3020 #define FF_PROFILE_MPEG4_CORE 2
3021 #define FF_PROFILE_MPEG4_MAIN 3
3022 #define FF_PROFILE_MPEG4_N_BIT 4
3023 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3024 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3025 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3026 #define FF_PROFILE_MPEG4_HYBRID 8
3027 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3028 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3029 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3030 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3031 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3032 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3033 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3035 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3036 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3037 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3038 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3039 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3041 #define FF_PROFILE_VP9_0 0
3042 #define FF_PROFILE_VP9_1 1
3043 #define FF_PROFILE_VP9_2 2
3044 #define FF_PROFILE_VP9_3 3
3046 #define FF_PROFILE_HEVC_MAIN 1
3047 #define FF_PROFILE_HEVC_MAIN_10 2
3048 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3049 #define FF_PROFILE_HEVC_REXT 4
3053 * - encoding: Set by user.
3054 * - decoding: Set by libavcodec.
3057 #define FF_LEVEL_UNKNOWN -99
3060 * Skip loop filtering for selected frames.
3061 * - encoding: unused
3062 * - decoding: Set by user.
3064 enum AVDiscard skip_loop_filter;
3067 * Skip IDCT/dequantization for selected frames.
3068 * - encoding: unused
3069 * - decoding: Set by user.
3071 enum AVDiscard skip_idct;
3074 * Skip decoding for selected frames.
3075 * - encoding: unused
3076 * - decoding: Set by user.
3078 enum AVDiscard skip_frame;
3081 * Header containing style information for text subtitles.
3082 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3083 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3084 * the Format line following. It shouldn't include any Dialogue line.
3085 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3086 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3088 uint8_t *subtitle_header;
3089 int subtitle_header_size;
3091 #if FF_API_ERROR_RATE
3093 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3096 attribute_deprecated
3101 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3102 * Used for compliant TS muxing.
3103 * - encoding: Set by libavcodec.
3104 * - decoding: unused.
3108 #if FF_API_SIDEDATA_ONLY_PKT
3110 * Encoding only and set by default. Allow encoders to output packets
3111 * that do not contain any encoded data, only side data.
3113 * Some encoders need to output such packets, e.g. to update some stream
3114 * parameters at the end of encoding.
3116 * @deprecated this field disables the default behaviour and
3117 * it is kept only for compatibility.
3119 attribute_deprecated
3120 int side_data_only_packets;
3124 * Audio only. The number of "priming" samples (padding) inserted by the
3125 * encoder at the beginning of the audio. I.e. this number of leading
3126 * decoded samples must be discarded by the caller to get the original audio
3127 * without leading padding.
3129 * - decoding: unused
3130 * - encoding: Set by libavcodec. The timestamps on the output packets are
3131 * adjusted by the encoder so that they always refer to the
3132 * first sample of the data actually contained in the packet,
3133 * including any added padding. E.g. if the timebase is
3134 * 1/samplerate and the timestamp of the first input sample is
3135 * 0, the timestamp of the first output packet will be
3138 int initial_padding;
3141 * - decoding: For codecs that store a framerate value in the compressed
3142 * bitstream, the decoder may export it here. { 0, 1} when
3144 * - encoding: unused
3146 AVRational framerate;
3149 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3150 * - encoding: unused.
3151 * - decoding: Set by libavcodec before calling get_format()
3153 enum AVPixelFormat sw_pix_fmt;
3156 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3157 * Code outside libavcodec should access this field using:
3158 * av_codec_{get,set}_pkt_timebase(avctx)
3159 * - encoding unused.
3160 * - decoding set by user.
3162 AVRational pkt_timebase;
3166 * Code outside libavcodec should access this field using:
3167 * av_codec_{get,set}_codec_descriptor(avctx)
3168 * - encoding: unused.
3169 * - decoding: set by libavcodec.
3171 const AVCodecDescriptor *codec_descriptor;
3175 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3176 * - encoding: unused
3177 * - decoding: Set by user.
3178 * Code outside libavcodec should access this field using:
3179 * av_codec_{get,set}_lowres(avctx)
3185 * Current statistics for PTS correction.
3186 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3187 * - encoding: unused
3189 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3190 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3191 int64_t pts_correction_last_pts; /// PTS of the last frame
3192 int64_t pts_correction_last_dts; /// DTS of the last frame
3195 * Character encoding of the input subtitles file.
3196 * - decoding: set by user
3197 * - encoding: unused
3202 * Subtitles character encoding mode. Formats or codecs might be adjusting
3203 * this setting (if they are doing the conversion themselves for instance).
3204 * - decoding: set by libavcodec
3205 * - encoding: unused
3207 int sub_charenc_mode;
3208 #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)
3209 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3210 #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
3213 * Skip processing alpha if supported by codec.
3214 * Note that if the format uses pre-multiplied alpha (common with VP6,
3215 * and recommended due to better video quality/compression)
3216 * the image will look as if alpha-blended onto a black background.
3217 * However for formats that do not use pre-multiplied alpha
3218 * there might be serious artefacts (though e.g. libswscale currently
3219 * assumes pre-multiplied alpha anyway).
3220 * Code outside libavcodec should access this field using AVOptions
3222 * - decoding: set by user
3223 * - encoding: unused
3228 * Number of samples to skip after a discontinuity
3229 * - decoding: unused
3230 * - encoding: set by libavcodec
3234 #if !FF_API_DEBUG_MV
3236 * debug motion vectors
3237 * Code outside libavcodec should access this field using AVOptions
3238 * - encoding: Set by user.
3239 * - decoding: Set by user.
3242 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3243 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3244 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3248 * custom intra quantization matrix
3249 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3250 * - encoding: Set by user, can be NULL.
3251 * - decoding: unused.
3253 uint16_t *chroma_intra_matrix;
3256 * dump format separator.
3257 * can be ", " or "\n " or anything else
3258 * Code outside libavcodec should access this field using AVOptions
3259 * (NO direct access).
3260 * - encoding: Set by user.
3261 * - decoding: Set by user.
3263 uint8_t *dump_separator;
3266 * ',' separated list of allowed decoders.
3267 * If NULL then all are allowed
3268 * - encoding: unused
3269 * - decoding: set by user through AVOPtions (NO direct access)
3271 char *codec_whitelist;
3274 * Properties of the stream that gets decoded
3275 * To be accessed through av_codec_get_properties() (NO direct access)
3276 * - encoding: unused
3277 * - decoding: set by libavcodec
3279 unsigned properties;
3280 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3281 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3284 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3285 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3287 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3288 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3290 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3292 int av_codec_get_lowres(const AVCodecContext *avctx);
3293 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3295 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3296 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3298 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3299 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3304 typedef struct AVProfile {
3306 const char *name; ///< short name for the profile
3309 typedef struct AVCodecDefault AVCodecDefault;
3316 typedef struct AVCodec {
3318 * Name of the codec implementation.
3319 * The name is globally unique among encoders and among decoders (but an
3320 * encoder and a decoder can share the same name).
3321 * This is the primary way to find a codec from the user perspective.
3325 * Descriptive name for the codec, meant to be more human readable than name.
3326 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3328 const char *long_name;
3329 enum AVMediaType type;
3332 * Codec capabilities.
3333 * see AV_CODEC_CAP_*
3336 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3337 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3338 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3339 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3340 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3341 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3342 const AVClass *priv_class; ///< AVClass for the private context
3343 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3345 /*****************************************************************
3346 * No fields below this line are part of the public API. They
3347 * may not be used outside of libavcodec and can be changed and
3349 * New public fields should be added right above.
3350 *****************************************************************
3353 struct AVCodec *next;
3355 * @name Frame-level threading support functions
3359 * If defined, called on thread contexts when they are created.
3360 * If the codec allocates writable tables in init(), re-allocate them here.
3361 * priv_data will be set to a copy of the original.
3363 int (*init_thread_copy)(AVCodecContext *);
3365 * Copy necessary context variables from a previous thread context to the current one.
3366 * If not defined, the next thread will start automatically; otherwise, the codec
3367 * must call ff_thread_finish_setup().
3369 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3371 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3375 * Private codec-specific defaults.
3377 const AVCodecDefault *defaults;
3380 * Initialize codec static data, called from avcodec_register().
3382 void (*init_static_data)(struct AVCodec *codec);
3384 int (*init)(AVCodecContext *);
3385 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3386 const struct AVSubtitle *sub);
3388 * Encode data to an AVPacket.
3390 * @param avctx codec context
3391 * @param avpkt output AVPacket (may contain a user-provided buffer)
3392 * @param[in] frame AVFrame containing the raw data to be encoded
3393 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3394 * non-empty packet was returned in avpkt.
3395 * @return 0 on success, negative error code on failure
3397 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3398 int *got_packet_ptr);
3399 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3400 int (*close)(AVCodecContext *);
3403 * Will be called when seeking
3405 void (*flush)(AVCodecContext *);
3407 * Internal codec capabilities.
3408 * See FF_CODEC_CAP_* in internal.h
3413 int av_codec_get_max_lowres(const AVCodec *codec);
3415 struct MpegEncContext;
3418 * @defgroup lavc_hwaccel AVHWAccel
3421 typedef struct AVHWAccel {
3423 * Name of the hardware accelerated codec.
3424 * The name is globally unique among encoders and among decoders (but an
3425 * encoder and a decoder can share the same name).
3430 * Type of codec implemented by the hardware accelerator.
3432 * See AVMEDIA_TYPE_xxx
3434 enum AVMediaType type;
3437 * Codec implemented by the hardware accelerator.
3439 * See AV_CODEC_ID_xxx
3444 * Supported pixel format.
3446 * Only hardware accelerated formats are supported here.
3448 enum AVPixelFormat pix_fmt;
3451 * Hardware accelerated codec capabilities.
3452 * see HWACCEL_CODEC_CAP_*
3456 /*****************************************************************
3457 * No fields below this line are part of the public API. They
3458 * may not be used outside of libavcodec and can be changed and
3460 * New public fields should be added right above.
3461 *****************************************************************
3463 struct AVHWAccel *next;
3466 * Allocate a custom buffer
3468 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3471 * Called at the beginning of each frame or field picture.
3473 * Meaningful frame information (codec specific) is guaranteed to
3474 * be parsed at this point. This function is mandatory.
3476 * Note that buf can be NULL along with buf_size set to 0.
3477 * Otherwise, this means the whole frame is available at this point.
3479 * @param avctx the codec context
3480 * @param buf the frame data buffer base
3481 * @param buf_size the size of the frame in bytes
3482 * @return zero if successful, a negative value otherwise
3484 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3487 * Callback for each slice.
3489 * Meaningful slice information (codec specific) is guaranteed to
3490 * be parsed at this point. This function is mandatory.
3491 * The only exception is XvMC, that works on MB level.
3493 * @param avctx the codec context
3494 * @param buf the slice data buffer base
3495 * @param buf_size the size of the slice in bytes
3496 * @return zero if successful, a negative value otherwise
3498 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3501 * Called at the end of each frame or field picture.
3503 * The whole picture is parsed at this point and can now be sent
3504 * to the hardware accelerator. This function is mandatory.
3506 * @param avctx the codec context
3507 * @return zero if successful, a negative value otherwise
3509 int (*end_frame)(AVCodecContext *avctx);
3512 * Size of per-frame hardware accelerator private data.
3514 * Private data is allocated with av_mallocz() before
3515 * AVCodecContext.get_buffer() and deallocated after
3516 * AVCodecContext.release_buffer().
3518 int frame_priv_data_size;
3521 * Called for every Macroblock in a slice.
3523 * XvMC uses it to replace the ff_mpv_decode_mb().
3524 * Instead of decoding to raw picture, MB parameters are
3525 * stored in an array provided by the video driver.
3527 * @param s the mpeg context
3529 void (*decode_mb)(struct MpegEncContext *s);
3532 * Initialize the hwaccel private data.
3534 * This will be called from ff_get_format(), after hwaccel and
3535 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3538 int (*init)(AVCodecContext *avctx);
3541 * Uninitialize the hwaccel private data.
3543 * This will be called from get_format() or avcodec_close(), after hwaccel
3544 * and hwaccel_context are already uninitialized.
3546 int (*uninit)(AVCodecContext *avctx);
3549 * Size of the private data to allocate in
3550 * AVCodecInternal.hwaccel_priv_data.
3556 * Hardware acceleration should be used for decoding even if the codec level
3557 * used is unknown or higher than the maximum supported level reported by the
3560 * It's generally a good idea to pass this flag unless you have a specific
3561 * reason not to, as hardware tends to under-report supported levels.
3563 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3566 * Hardware acceleration can output YUV pixel formats with a different chroma
3567 * sampling than 4:2:0 and/or other than 8 bits per component.
3569 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3575 #if FF_API_AVPICTURE
3577 * @defgroup lavc_picture AVPicture
3579 * Functions for working with AVPicture
3584 * Picture data structure.
3586 * Up to four components can be stored into it, the last component is
3588 * @deprecated use AVFrame or imgutils functions instead
3590 typedef struct AVPicture {
3591 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3592 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3600 enum AVSubtitleType {
3603 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3606 * Plain text, the text field must be set by the decoder and is
3607 * authoritative. ass and pict fields may contain approximations.
3612 * Formatted text, the ass field must be set by the decoder and is
3613 * authoritative. pict and text fields may contain approximations.
3618 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3620 typedef struct AVSubtitleRect {
3621 int x; ///< top left corner of pict, undefined when pict is not set
3622 int y; ///< top left corner of pict, undefined when pict is not set
3623 int w; ///< width of pict, undefined when pict is not set
3624 int h; ///< height of pict, undefined when pict is not set
3625 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3627 #if FF_API_AVPICTURE
3629 * @deprecated unused
3631 attribute_deprecated
3635 * data+linesize for the bitmap of this subtitle.
3636 * Can be set for text/ass as well once they are rendered.
3641 enum AVSubtitleType type;
3643 char *text; ///< 0 terminated plain UTF-8 text
3646 * 0 terminated ASS/SSA compatible event line.
3647 * The presentation of this is unaffected by the other values in this
3655 typedef struct AVSubtitle {
3656 uint16_t format; /* 0 = graphics */
3657 uint32_t start_display_time; /* relative to packet pts, in ms */
3658 uint32_t end_display_time; /* relative to packet pts, in ms */
3660 AVSubtitleRect **rects;
3661 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3665 * If c is NULL, returns the first registered codec,
3666 * if c is non-NULL, returns the next registered codec after c,
3667 * or NULL if c is the last one.
3669 AVCodec *av_codec_next(const AVCodec *c);
3672 * Return the LIBAVCODEC_VERSION_INT constant.
3674 unsigned avcodec_version(void);
3677 * Return the libavcodec build-time configuration.
3679 const char *avcodec_configuration(void);
3682 * Return the libavcodec license.
3684 const char *avcodec_license(void);
3687 * Register the codec codec and initialize libavcodec.
3689 * @warning either this function or avcodec_register_all() must be called
3690 * before any other libavcodec functions.
3692 * @see avcodec_register_all()
3694 void avcodec_register(AVCodec *codec);
3697 * Register all the codecs, parsers and bitstream filters which were enabled at
3698 * configuration time. If you do not call this function you can select exactly
3699 * which formats you want to support, by using the individual registration
3702 * @see avcodec_register
3703 * @see av_register_codec_parser
3704 * @see av_register_bitstream_filter
3706 void avcodec_register_all(void);
3709 * Allocate an AVCodecContext and set its fields to default values. The
3710 * resulting struct should be freed with avcodec_free_context().
3712 * @param codec if non-NULL, allocate private data and initialize defaults
3713 * for the given codec. It is illegal to then call avcodec_open2()
3714 * with a different codec.
3715 * If NULL, then the codec-specific defaults won't be initialized,
3716 * which may result in suboptimal default settings (this is
3717 * important mainly for encoders, e.g. libx264).
3719 * @return An AVCodecContext filled with default values or NULL on failure.
3720 * @see avcodec_get_context_defaults
3722 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3725 * Free the codec context and everything associated with it and write NULL to
3726 * the provided pointer.
3728 void avcodec_free_context(AVCodecContext **avctx);
3731 * Set the fields of the given AVCodecContext to default values corresponding
3732 * to the given codec (defaults may be codec-dependent).
3734 * Do not call this function if a non-NULL codec has been passed
3735 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3736 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3737 * different codec on this AVCodecContext.
3739 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3742 * Get the AVClass for AVCodecContext. It can be used in combination with
3743 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3745 * @see av_opt_find().
3747 const AVClass *avcodec_get_class(void);
3750 * Get the AVClass for AVFrame. It can be used in combination with
3751 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3753 * @see av_opt_find().
3755 const AVClass *avcodec_get_frame_class(void);
3758 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3759 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3761 * @see av_opt_find().
3763 const AVClass *avcodec_get_subtitle_rect_class(void);
3766 * Copy the settings of the source AVCodecContext into the destination
3767 * AVCodecContext. The resulting destination codec context will be
3768 * unopened, i.e. you are required to call avcodec_open2() before you
3769 * can use this AVCodecContext to decode/encode video/audio data.
3771 * @param dest target codec context, should be initialized with
3772 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3773 * @param src source codec context
3774 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3776 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3779 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3780 * function the context has to be allocated with avcodec_alloc_context3().
3782 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3783 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3784 * retrieving a codec.
3786 * @warning This function is not thread safe!
3788 * @note Always call this function before using decoding routines (such as
3789 * @ref avcodec_decode_video2()).
3792 * avcodec_register_all();
3793 * av_dict_set(&opts, "b", "2.5M", 0);
3794 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3798 * context = avcodec_alloc_context3(codec);
3800 * if (avcodec_open2(context, codec, opts) < 0)
3804 * @param avctx The context to initialize.
3805 * @param codec The codec to open this context for. If a non-NULL codec has been
3806 * previously passed to avcodec_alloc_context3() or
3807 * avcodec_get_context_defaults3() for this context, then this
3808 * parameter MUST be either NULL or equal to the previously passed
3810 * @param options A dictionary filled with AVCodecContext and codec-private options.
3811 * On return this object will be filled with options that were not found.
3813 * @return zero on success, a negative value on error
3814 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3815 * av_dict_set(), av_opt_find().
3817 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3820 * Close a given AVCodecContext and free all the data associated with it
3821 * (but not the AVCodecContext itself).
3823 * Calling this function on an AVCodecContext that hasn't been opened will free
3824 * the codec-specific data allocated in avcodec_alloc_context3() /
3825 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3828 int avcodec_close(AVCodecContext *avctx);
3831 * Free all allocated data in the given subtitle struct.
3833 * @param sub AVSubtitle to free.
3835 void avsubtitle_free(AVSubtitle *sub);
3842 * @addtogroup lavc_packet
3847 * Initialize optional fields of a packet with default values.
3849 * Note, this does not touch the data and size members, which have to be
3850 * initialized separately.
3854 void av_init_packet(AVPacket *pkt);
3857 * Allocate the payload of a packet and initialize its fields with
3861 * @param size wanted payload size
3862 * @return 0 if OK, AVERROR_xxx otherwise
3864 int av_new_packet(AVPacket *pkt, int size);
3867 * Reduce packet size, correctly zeroing padding
3870 * @param size new size
3872 void av_shrink_packet(AVPacket *pkt, int size);
3875 * Increase packet size, correctly zeroing padding
3878 * @param grow_by number of bytes by which to increase the size of the packet
3880 int av_grow_packet(AVPacket *pkt, int grow_by);
3883 * Initialize a reference-counted packet from av_malloc()ed data.
3885 * @param pkt packet to be initialized. This function will set the data, size,
3886 * buf and destruct fields, all others are left untouched.
3887 * @param data Data allocated by av_malloc() to be used as packet data. If this
3888 * function returns successfully, the data is owned by the underlying AVBuffer.
3889 * The caller may not access the data through other means.
3890 * @param size size of data in bytes, without the padding. I.e. the full buffer
3891 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
3893 * @return 0 on success, a negative AVERROR on error
3895 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3898 * @warning This is a hack - the packet memory allocation stuff is broken. The
3899 * packet is allocated if it was not really allocated.
3901 int av_dup_packet(AVPacket *pkt);
3904 * Copy packet, including contents
3906 * @return 0 on success, negative AVERROR on fail
3908 int av_copy_packet(AVPacket *dst, const AVPacket *src);
3911 * Copy packet side data
3913 * @return 0 on success, negative AVERROR on fail
3915 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
3920 * @param pkt packet to free
3922 void av_free_packet(AVPacket *pkt);
3925 * Allocate new information of a packet.
3928 * @param type side information type
3929 * @param size side information size
3930 * @return pointer to fresh allocated data or NULL otherwise
3932 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3936 * Shrink the already allocated side data buffer
3939 * @param type side information type
3940 * @param size new side information size
3941 * @return 0 on success, < 0 on failure
3943 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3947 * Get side information from packet.
3950 * @param type desired side information type
3951 * @param size pointer for side information size to store (optional)
3952 * @return pointer to data if present or NULL otherwise
3954 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3957 int av_packet_merge_side_data(AVPacket *pkt);
3959 int av_packet_split_side_data(AVPacket *pkt);
3961 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
3964 * Pack a dictionary for use in side_data.
3966 * @param dict The dictionary to pack.
3967 * @param size pointer to store the size of the returned data
3968 * @return pointer to data if successful, NULL otherwise
3970 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
3972 * Unpack a dictionary from side_data.
3974 * @param data data from side_data
3975 * @param size size of the data
3976 * @param dict the metadata storage dictionary
3977 * @return 0 on success, < 0 on failure
3979 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
3983 * Convenience function to free all the side data stored.
3984 * All the other fields stay untouched.
3988 void av_packet_free_side_data(AVPacket *pkt);
3991 * Setup a new reference to the data described by a given packet
3993 * If src is reference-counted, setup dst as a new reference to the
3994 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3995 * data from src into it.
3997 * All the other fields are copied from src.
3999 * @see av_packet_unref
4001 * @param dst Destination packet
4002 * @param src Source packet
4004 * @return 0 on success, a negative AVERROR on error.
4006 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4011 * Unreference the buffer referenced by the packet and reset the
4012 * remaining packet fields to their default values.
4014 * @param pkt The packet to be unreferenced.
4016 void av_packet_unref(AVPacket *pkt);
4019 * Move every field in src to dst and reset src.
4021 * @see av_packet_unref
4023 * @param src Source packet, will be reset
4024 * @param dst Destination packet
4026 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4029 * Copy only "properties" fields from src to dst.
4031 * Properties for the purpose of this function are all the fields
4032 * beside those related to the packet data (buf, data, size)
4034 * @param dst Destination packet
4035 * @param src Source packet
4037 * @return 0 on success AVERROR on failure.
4040 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4043 * Convert valid timing fields (timestamps / durations) in a packet from one
4044 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4047 * @param pkt packet on which the conversion will be performed
4048 * @param tb_src source timebase, in which the timing fields in pkt are
4050 * @param tb_dst destination timebase, to which the timing fields will be
4053 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4060 * @addtogroup lavc_decoding
4065 * Find a registered decoder with a matching codec ID.
4067 * @param id AVCodecID of the requested decoder
4068 * @return A decoder if one was found, NULL otherwise.
4070 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4073 * Find a registered decoder with the specified name.
4075 * @param name name of the requested decoder
4076 * @return A decoder if one was found, NULL otherwise.
4078 AVCodec *avcodec_find_decoder_by_name(const char *name);
4081 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4082 * it can be called by custom get_buffer2() implementations for decoders without
4083 * AV_CODEC_CAP_DR1 set.
4085 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4089 * Return the amount of padding in pixels which the get_buffer callback must
4090 * provide around the edge of the image for codecs which do not have the
4091 * CODEC_FLAG_EMU_EDGE flag.
4093 * @return Required padding in pixels.
4095 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4098 attribute_deprecated
4099 unsigned avcodec_get_edge_width(void);
4103 * Modify width and height values so that they will result in a memory
4104 * buffer that is acceptable for the codec if you do not use any horizontal
4107 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4109 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4112 * Modify width and height values so that they will result in a memory
4113 * buffer that is acceptable for the codec if you also ensure that all
4114 * line sizes are a multiple of the respective linesize_align[i].
4116 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4118 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4119 int linesize_align[AV_NUM_DATA_POINTERS]);
4122 * Converts AVChromaLocation to swscale x/y chroma position.
4124 * The positions represent the chroma (0,0) position in a coordinates system
4125 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4127 * @param xpos horizontal chroma sample position
4128 * @param ypos vertical chroma sample position
4130 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4133 * Converts swscale x/y chroma position to AVChromaLocation.
4135 * The positions represent the chroma (0,0) position in a coordinates system
4136 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4138 * @param xpos horizontal chroma sample position
4139 * @param ypos vertical chroma sample position
4141 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4144 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4146 * Some decoders may support multiple frames in a single AVPacket. Such
4147 * decoders would then just decode the first frame and the return value would be
4148 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4149 * called again with an AVPacket containing the remaining data in order to
4150 * decode the second frame, etc... Even if no frames are returned, the packet
4151 * needs to be fed to the decoder with remaining data until it is completely
4152 * consumed or an error occurs.
4154 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4155 * and output. This means that for some packets they will not immediately
4156 * produce decoded output and need to be flushed at the end of decoding to get
4157 * all the decoded data. Flushing is done by calling this function with packets
4158 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4159 * returning samples. It is safe to flush even those decoders that are not
4160 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4162 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4163 * larger than the actual read bytes because some optimized bitstream
4164 * readers read 32 or 64 bits at once and could read over the end.
4166 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4167 * before packets may be fed to the decoder.
4169 * @param avctx the codec context
4170 * @param[out] frame The AVFrame in which to store decoded audio samples.
4171 * The decoder will allocate a buffer for the decoded frame by
4172 * calling the AVCodecContext.get_buffer2() callback.
4173 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4174 * reference counted and the returned reference belongs to the
4175 * caller. The caller must release the frame using av_frame_unref()
4176 * when the frame is no longer needed. The caller may safely write
4177 * to the frame if av_frame_is_writable() returns 1.
4178 * When AVCodecContext.refcounted_frames is set to 0, the returned
4179 * reference belongs to the decoder and is valid only until the
4180 * next call to this function or until closing or flushing the
4181 * decoder. The caller may not write to it.
4182 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4183 * non-zero. Note that this field being set to zero
4184 * does not mean that an error has occurred. For
4185 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4186 * call is guaranteed to produce a frame.
4187 * @param[in] avpkt The input AVPacket containing the input buffer.
4188 * At least avpkt->data and avpkt->size should be set. Some
4189 * decoders might also require additional fields to be set.
4190 * @return A negative error code is returned if an error occurred during
4191 * decoding, otherwise the number of bytes consumed from the input
4192 * AVPacket is returned.
4194 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4195 int *got_frame_ptr, const AVPacket *avpkt);
4198 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4199 * Some decoders may support multiple frames in a single AVPacket, such
4200 * decoders would then just decode the first frame.
4202 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4203 * the actual read bytes because some optimized bitstream readers read 32 or 64
4204 * bits at once and could read over the end.
4206 * @warning The end of the input buffer buf should be set to 0 to ensure that
4207 * no overreading happens for damaged MPEG streams.
4209 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4210 * between input and output, these need to be fed with avpkt->data=NULL,
4211 * avpkt->size=0 at the end to return the remaining frames.
4213 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4214 * before packets may be fed to the decoder.
4216 * @param avctx the codec context
4217 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4218 * Use av_frame_alloc() to get an AVFrame. The codec will
4219 * allocate memory for the actual bitmap by calling the
4220 * AVCodecContext.get_buffer2() callback.
4221 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4222 * reference counted and the returned reference belongs to the
4223 * caller. The caller must release the frame using av_frame_unref()
4224 * when the frame is no longer needed. The caller may safely write
4225 * to the frame if av_frame_is_writable() returns 1.
4226 * When AVCodecContext.refcounted_frames is set to 0, the returned
4227 * reference belongs to the decoder and is valid only until the
4228 * next call to this function or until closing or flushing the
4229 * decoder. The caller may not write to it.
4231 * @param[in] avpkt The input AVPacket containing the input buffer.
4232 * You can create such packet with av_init_packet() and by then setting
4233 * data and size, some decoders might in addition need other fields like
4234 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4236 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4237 * @return On error a negative value is returned, otherwise the number of bytes
4238 * used or zero if no frame could be decompressed.
4240 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4241 int *got_picture_ptr,
4242 const AVPacket *avpkt);
4245 * Decode a subtitle message.
4246 * Return a negative value on error, otherwise return the number of bytes used.
4247 * If no subtitle could be decompressed, got_sub_ptr is zero.
4248 * Otherwise, the subtitle is stored in *sub.
4249 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4250 * simplicity, because the performance difference is expect to be negligible
4251 * and reusing a get_buffer written for video codecs would probably perform badly
4252 * due to a potentially very different allocation pattern.
4254 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4255 * and output. This means that for some packets they will not immediately
4256 * produce decoded output and need to be flushed at the end of decoding to get
4257 * all the decoded data. Flushing is done by calling this function with packets
4258 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4259 * returning subtitles. It is safe to flush even those decoders that are not
4260 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4262 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4263 * before packets may be fed to the decoder.
4265 * @param avctx the codec context
4266 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4267 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4268 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4269 * @param[in] avpkt The input AVPacket containing the input buffer.
4271 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4276 * @defgroup lavc_parsing Frame parsing
4280 enum AVPictureStructure {
4281 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4282 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4283 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4284 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4287 typedef struct AVCodecParserContext {
4289 struct AVCodecParser *parser;
4290 int64_t frame_offset; /* offset of the current frame */
4291 int64_t cur_offset; /* current offset
4292 (incremented by each av_parser_parse()) */
4293 int64_t next_frame_offset; /* offset of the next frame */
4295 int pict_type; /* XXX: Put it back in AVCodecContext. */
4297 * This field is used for proper frame duration computation in lavf.
4298 * It signals, how much longer the frame duration of the current frame
4299 * is compared to normal frame duration.
4301 * frame_duration = (1 + repeat_pict) * time_base
4303 * It is used by codecs like H.264 to display telecined material.
4305 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4306 int64_t pts; /* pts of the current frame */
4307 int64_t dts; /* dts of the current frame */
4312 int fetch_timestamp;
4314 #define AV_PARSER_PTS_NB 4
4315 int cur_frame_start_index;
4316 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4317 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4318 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4321 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4322 #define PARSER_FLAG_ONCE 0x0002
4323 /// Set if the parser has a valid file offset
4324 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4325 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4327 int64_t offset; ///< byte offset from starting packet start
4328 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4331 * Set by parser to 1 for key frames and 0 for non-key frames.
4332 * It is initialized to -1, so if the parser doesn't set this flag,
4333 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4338 #if FF_API_CONVERGENCE_DURATION
4340 * @deprecated unused
4342 attribute_deprecated
4343 int64_t convergence_duration;
4346 // Timestamp generation support:
4348 * Synchronization point for start of timestamp generation.
4350 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4353 * For example, this corresponds to presence of H.264 buffering period
4359 * Offset of the current timestamp against last timestamp sync point in
4360 * units of AVCodecContext.time_base.
4362 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4363 * contain a valid timestamp offset.
4365 * Note that the timestamp of sync point has usually a nonzero
4366 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4367 * the next frame after timestamp sync point will be usually 1.
4369 * For example, this corresponds to H.264 cpb_removal_delay.
4371 int dts_ref_dts_delta;
4374 * Presentation delay of current frame in units of AVCodecContext.time_base.
4376 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4377 * contain valid non-negative timestamp delta (presentation time of a frame
4378 * must not lie in the past).
4380 * This delay represents the difference between decoding and presentation
4381 * time of the frame.
4383 * For example, this corresponds to H.264 dpb_output_delay.
4388 * Position of the packet in file.
4390 * Analogous to cur_frame_pts/dts
4392 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4395 * Byte position of currently parsed frame in stream.
4400 * Previous frame byte position.
4405 * Duration of the current frame.
4406 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4407 * For all other types, this is in units of AVCodecContext.time_base.
4411 enum AVFieldOrder field_order;
4414 * Indicate whether a picture is coded as a frame, top field or bottom field.
4416 * For example, H.264 field_pic_flag equal to 0 corresponds to
4417 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4418 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4419 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4421 enum AVPictureStructure picture_structure;
4424 * Picture number incremented in presentation or output order.
4425 * This field may be reinitialized at the first picture of a new sequence.
4427 * For example, this corresponds to H.264 PicOrderCnt.
4429 int output_picture_number;
4432 * Dimensions of the decoded video intended for presentation.
4438 * Dimensions of the coded video.
4444 * The format of the coded data, corresponds to enum AVPixelFormat for video
4445 * and for enum AVSampleFormat for audio.
4447 * Note that a decoder can have considerable freedom in how exactly it
4448 * decodes the data, so the format reported here might be different from the
4449 * one returned by a decoder.
4452 } AVCodecParserContext;
4454 typedef struct AVCodecParser {
4455 int codec_ids[5]; /* several codec IDs are permitted */
4457 int (*parser_init)(AVCodecParserContext *s);
4458 /* This callback never returns an error, a negative value means that
4459 * the frame start was in a previous packet. */
4460 int (*parser_parse)(AVCodecParserContext *s,
4461 AVCodecContext *avctx,
4462 const uint8_t **poutbuf, int *poutbuf_size,
4463 const uint8_t *buf, int buf_size);
4464 void (*parser_close)(AVCodecParserContext *s);
4465 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4466 struct AVCodecParser *next;
4469 AVCodecParser *av_parser_next(const AVCodecParser *c);
4471 void av_register_codec_parser(AVCodecParser *parser);
4472 AVCodecParserContext *av_parser_init(int codec_id);
4477 * @param s parser context.
4478 * @param avctx codec context.
4479 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4480 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4481 * @param buf input buffer.
4482 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4483 * @param pts input presentation timestamp.
4484 * @param dts input decoding timestamp.
4485 * @param pos input byte position in stream.
4486 * @return the number of bytes of the input bitstream used.
4491 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4498 * decode_frame(data, size);
4502 int av_parser_parse2(AVCodecParserContext *s,
4503 AVCodecContext *avctx,
4504 uint8_t **poutbuf, int *poutbuf_size,
4505 const uint8_t *buf, int buf_size,
4506 int64_t pts, int64_t dts,
4510 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4511 * @deprecated use AVBitStreamFilter
4513 int av_parser_change(AVCodecParserContext *s,
4514 AVCodecContext *avctx,
4515 uint8_t **poutbuf, int *poutbuf_size,
4516 const uint8_t *buf, int buf_size, int keyframe);
4517 void av_parser_close(AVCodecParserContext *s);
4525 * @addtogroup lavc_encoding
4530 * Find a registered encoder with a matching codec ID.
4532 * @param id AVCodecID of the requested encoder
4533 * @return An encoder if one was found, NULL otherwise.
4535 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4538 * Find a registered encoder with the specified name.
4540 * @param name name of the requested encoder
4541 * @return An encoder if one was found, NULL otherwise.
4543 AVCodec *avcodec_find_encoder_by_name(const char *name);
4546 * Encode a frame of audio.
4548 * Takes input samples from frame and writes the next output packet, if
4549 * available, to avpkt. The output packet does not necessarily contain data for
4550 * the most recent frame, as encoders can delay, split, and combine input frames
4551 * internally as needed.
4553 * @param avctx codec context
4554 * @param avpkt output AVPacket.
4555 * The user can supply an output buffer by setting
4556 * avpkt->data and avpkt->size prior to calling the
4557 * function, but if the size of the user-provided data is not
4558 * large enough, encoding will fail. If avpkt->data and
4559 * avpkt->size are set, avpkt->destruct must also be set. All
4560 * other AVPacket fields will be reset by the encoder using
4561 * av_init_packet(). If avpkt->data is NULL, the encoder will
4562 * allocate it. The encoder will set avpkt->size to the size
4563 * of the output packet.
4565 * If this function fails or produces no output, avpkt will be
4566 * freed using av_free_packet() (i.e. avpkt->destruct will be
4567 * called to free the user supplied buffer).
4568 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4569 * May be NULL when flushing an encoder that has the
4570 * AV_CODEC_CAP_DELAY capability set.
4571 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4572 * can have any number of samples.
4573 * If it is not set, frame->nb_samples must be equal to
4574 * avctx->frame_size for all frames except the last.
4575 * The final frame may be smaller than avctx->frame_size.
4576 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4577 * output packet is non-empty, and to 0 if it is
4578 * empty. If the function returns an error, the
4579 * packet can be assumed to be invalid, and the
4580 * value of got_packet_ptr is undefined and should
4582 * @return 0 on success, negative error code on failure
4584 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4585 const AVFrame *frame, int *got_packet_ptr);
4588 * Encode a frame of video.
4590 * Takes input raw video data from frame and writes the next output packet, if
4591 * available, to avpkt. The output packet does not necessarily contain data for
4592 * the most recent frame, as encoders can delay and reorder input frames
4593 * internally as needed.
4595 * @param avctx codec context
4596 * @param avpkt output AVPacket.
4597 * The user can supply an output buffer by setting
4598 * avpkt->data and avpkt->size prior to calling the
4599 * function, but if the size of the user-provided data is not
4600 * large enough, encoding will fail. All other AVPacket fields
4601 * will be reset by the encoder using av_init_packet(). If
4602 * avpkt->data is NULL, the encoder will allocate it.
4603 * The encoder will set avpkt->size to the size of the
4604 * output packet. The returned data (if any) belongs to the
4605 * caller, he is responsible for freeing it.
4607 * If this function fails or produces no output, avpkt will be
4608 * freed using av_free_packet() (i.e. avpkt->destruct will be
4609 * called to free the user supplied buffer).
4610 * @param[in] frame AVFrame containing the raw video data to be encoded.
4611 * May be NULL when flushing an encoder that has the
4612 * AV_CODEC_CAP_DELAY capability set.
4613 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4614 * output packet is non-empty, and to 0 if it is
4615 * empty. If the function returns an error, the
4616 * packet can be assumed to be invalid, and the
4617 * value of got_packet_ptr is undefined and should
4619 * @return 0 on success, negative error code on failure
4621 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4622 const AVFrame *frame, int *got_packet_ptr);
4624 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4625 const AVSubtitle *sub);
4632 #if FF_API_AVCODEC_RESAMPLE
4634 * @defgroup lavc_resample Audio resampling
4636 * @deprecated use libswresample instead
4640 struct ReSampleContext;
4641 struct AVResampleContext;
4643 typedef struct ReSampleContext ReSampleContext;
4646 * Initialize audio resampling context.
4648 * @param output_channels number of output channels
4649 * @param input_channels number of input channels
4650 * @param output_rate output sample rate
4651 * @param input_rate input sample rate
4652 * @param sample_fmt_out requested output sample format
4653 * @param sample_fmt_in input sample format
4654 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4655 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4656 * @param linear if 1 then the used FIR filter will be linearly interpolated
4657 between the 2 closest, if 0 the closest will be used
4658 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4659 * @return allocated ReSampleContext, NULL if error occurred
4661 attribute_deprecated
4662 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4663 int output_rate, int input_rate,
4664 enum AVSampleFormat sample_fmt_out,
4665 enum AVSampleFormat sample_fmt_in,
4666 int filter_length, int log2_phase_count,
4667 int linear, double cutoff);
4669 attribute_deprecated
4670 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4673 * Free resample context.
4675 * @param s a non-NULL pointer to a resample context previously
4676 * created with av_audio_resample_init()
4678 attribute_deprecated
4679 void audio_resample_close(ReSampleContext *s);
4683 * Initialize an audio resampler.
4684 * Note, if either rate is not an integer then simply scale both rates up so they are.
4685 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4686 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4687 * @param linear If 1 then the used FIR filter will be linearly interpolated
4688 between the 2 closest, if 0 the closest will be used
4689 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4691 attribute_deprecated
4692 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4695 * Resample an array of samples using a previously configured context.
4696 * @param src an array of unconsumed samples
4697 * @param consumed the number of samples of src which have been consumed are returned here
4698 * @param src_size the number of unconsumed samples available
4699 * @param dst_size the amount of space in samples available in dst
4700 * @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.
4701 * @return the number of samples written in dst or -1 if an error occurred
4703 attribute_deprecated
4704 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4708 * Compensate samplerate/timestamp drift. The compensation is done by changing
4709 * the resampler parameters, so no audible clicks or similar distortions occur
4710 * @param compensation_distance distance in output samples over which the compensation should be performed
4711 * @param sample_delta number of output samples which should be output less
4713 * example: av_resample_compensate(c, 10, 500)
4714 * here instead of 510 samples only 500 samples would be output
4716 * note, due to rounding the actual compensation might be slightly different,
4717 * especially if the compensation_distance is large and the in_rate used during init is small
4719 attribute_deprecated
4720 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4721 attribute_deprecated
4722 void av_resample_close(struct AVResampleContext *c);
4729 #if FF_API_AVPICTURE
4731 * @addtogroup lavc_picture
4736 * @deprecated unused
4738 attribute_deprecated
4739 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4742 * @deprecated unused
4744 attribute_deprecated
4745 void avpicture_free(AVPicture *picture);
4748 * @deprecated use av_image_fill_arrays() instead.
4750 attribute_deprecated
4751 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4752 enum AVPixelFormat pix_fmt, int width, int height);
4755 * @deprecated use av_image_copy_to_buffer() instead.
4757 attribute_deprecated
4758 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4759 int width, int height,
4760 unsigned char *dest, int dest_size);
4763 * @deprecated use av_image_get_buffer_size() instead.
4765 attribute_deprecated
4766 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4769 * @deprecated av_image_copy() instead.
4771 attribute_deprecated
4772 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4773 enum AVPixelFormat pix_fmt, int width, int height);
4776 * @deprecated unused
4778 attribute_deprecated
4779 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4780 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4783 * @deprecated unused
4785 attribute_deprecated
4786 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4787 int padtop, int padbottom, int padleft, int padright, int *color);
4795 * @defgroup lavc_misc Utility functions
4798 * Miscellaneous utility functions related to both encoding and decoding
4804 * @defgroup lavc_misc_pixfmt Pixel formats
4806 * Functions for working with pixel formats.
4811 * Utility function to access log2_chroma_w log2_chroma_h from
4812 * the pixel format AVPixFmtDescriptor.
4814 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4815 * for one that returns a failure code and continues in case of invalid
4818 * @param[in] pix_fmt the pixel format
4819 * @param[out] h_shift store log2_chroma_w
4820 * @param[out] v_shift store log2_chroma_h
4822 * @see av_pix_fmt_get_chroma_sub_sample
4825 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4828 * Return a value representing the fourCC code associated to the
4829 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4832 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4835 * @deprecated see av_get_pix_fmt_loss()
4837 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4841 * Find the best pixel format to convert to given a certain source pixel
4842 * format. When converting from one pixel format to another, information loss
4843 * may occur. For example, when converting from RGB24 to GRAY, the color
4844 * information will be lost. Similarly, other losses occur when converting from
4845 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4846 * the given pixel formats should be used to suffer the least amount of loss.
4847 * The pixel formats from which it chooses one, are determined by the
4848 * pix_fmt_list parameter.
4851 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4852 * @param[in] src_pix_fmt source pixel format
4853 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4854 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4855 * @return The best pixel format to convert to or -1 if none was found.
4857 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4858 enum AVPixelFormat src_pix_fmt,
4859 int has_alpha, int *loss_ptr);
4862 * @deprecated see av_find_best_pix_fmt_of_2()
4864 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4865 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4867 attribute_deprecated
4868 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4869 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4870 enum AVPixelFormat src_pix_fmt,
4871 int has_alpha, int *loss_ptr);
4873 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4874 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4878 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4884 #if FF_API_SET_DIMENSIONS
4886 * @deprecated this function is not supposed to be used from outside of lavc
4888 attribute_deprecated
4889 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4893 * Put a string representing the codec tag codec_tag in buf.
4895 * @param buf buffer to place codec tag in
4896 * @param buf_size size in bytes of buf
4897 * @param codec_tag codec tag to assign
4898 * @return the length of the string that would have been generated if
4899 * enough space had been available, excluding the trailing null
4901 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4903 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4906 * Return a name for the specified profile, if available.
4908 * @param codec the codec that is searched for the given profile
4909 * @param profile the profile value for which a name is requested
4910 * @return A name for the profile if found, NULL otherwise.
4912 const char *av_get_profile_name(const AVCodec *codec, int profile);
4914 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4915 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4916 //FIXME func typedef
4919 * Fill AVFrame audio data and linesize pointers.
4921 * The buffer buf must be a preallocated buffer with a size big enough
4922 * to contain the specified samples amount. The filled AVFrame data
4923 * pointers will point to this buffer.
4925 * AVFrame extended_data channel pointers are allocated if necessary for
4928 * @param frame the AVFrame
4929 * frame->nb_samples must be set prior to calling the
4930 * function. This function fills in frame->data,
4931 * frame->extended_data, frame->linesize[0].
4932 * @param nb_channels channel count
4933 * @param sample_fmt sample format
4934 * @param buf buffer to use for frame data
4935 * @param buf_size size of buffer
4936 * @param align plane size sample alignment (0 = default)
4937 * @return >=0 on success, negative error code on failure
4938 * @todo return the size in bytes required to store the samples in
4939 * case of success, at the next libavutil bump
4941 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4942 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4943 int buf_size, int align);
4946 * Reset the internal decoder state / flush internal buffers. Should be called
4947 * e.g. when seeking or when switching to a different stream.
4949 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4950 * this invalidates the frames previously returned from the decoder. When
4951 * refcounted frames are used, the decoder just releases any references it might
4952 * keep internally, but the caller's reference remains valid.
4954 void avcodec_flush_buffers(AVCodecContext *avctx);
4957 * Return codec bits per sample.
4959 * @param[in] codec_id the codec
4960 * @return Number of bits per sample or zero if unknown for the given codec.
4962 int av_get_bits_per_sample(enum AVCodecID codec_id);
4965 * Return the PCM codec associated with a sample format.
4966 * @param be endianness, 0 for little, 1 for big,
4967 * -1 (or anything else) for native
4968 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
4970 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4973 * Return codec bits per sample.
4974 * Only return non-zero if the bits per sample is exactly correct, not an
4977 * @param[in] codec_id the codec
4978 * @return Number of bits per sample or zero if unknown for the given codec.
4980 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4983 * Return audio frame duration.
4985 * @param avctx codec context
4986 * @param frame_bytes size of the frame, or 0 if unknown
4987 * @return frame duration, in samples, if known. 0 if not able to
4990 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4993 typedef struct AVBitStreamFilterContext {
4995 struct AVBitStreamFilter *filter;
4996 AVCodecParserContext *parser;
4997 struct AVBitStreamFilterContext *next;
4999 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5000 * Not for access by library users.
5003 } AVBitStreamFilterContext;
5006 typedef struct AVBitStreamFilter {
5009 int (*filter)(AVBitStreamFilterContext *bsfc,
5010 AVCodecContext *avctx, const char *args,
5011 uint8_t **poutbuf, int *poutbuf_size,
5012 const uint8_t *buf, int buf_size, int keyframe);
5013 void (*close)(AVBitStreamFilterContext *bsfc);
5014 struct AVBitStreamFilter *next;
5015 } AVBitStreamFilter;
5018 * Register a bitstream filter.
5020 * The filter will be accessible to the application code through
5021 * av_bitstream_filter_next() or can be directly initialized with
5022 * av_bitstream_filter_init().
5024 * @see avcodec_register_all()
5026 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5029 * Create and initialize a bitstream filter context given a bitstream
5032 * The returned context must be freed with av_bitstream_filter_close().
5034 * @param name the name of the bitstream filter
5035 * @return a bitstream filter context if a matching filter was found
5036 * and successfully initialized, NULL otherwise
5038 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5043 * This function filters the buffer buf with size buf_size, and places the
5044 * filtered buffer in the buffer pointed to by poutbuf.
5046 * The output buffer must be freed by the caller.
5048 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5049 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5050 * If specified, this must point to the encoder context of the
5051 * output stream the packet is sent to.
5052 * @param args arguments which specify the filter configuration, may be NULL
5053 * @param poutbuf pointer which is updated to point to the filtered buffer
5054 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5055 * @param buf buffer containing the data to filter
5056 * @param buf_size size in bytes of buf
5057 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5058 * @return >= 0 in case of success, or a negative error code in case of failure
5060 * If the return value is positive, an output buffer is allocated and
5061 * is available in *poutbuf, and is distinct from the input buffer.
5063 * If the return value is 0, the output buffer is not allocated and
5064 * should be considered identical to the input buffer, or in case
5065 * *poutbuf was set it points to the input buffer (not necessarily to
5066 * its starting address).
5068 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5069 AVCodecContext *avctx, const char *args,
5070 uint8_t **poutbuf, int *poutbuf_size,
5071 const uint8_t *buf, int buf_size, int keyframe);
5074 * Release bitstream filter context.
5076 * @param bsf the bitstream filter context created with
5077 * av_bitstream_filter_init(), can be NULL
5079 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5082 * If f is NULL, return the first registered bitstream filter,
5083 * if f is non-NULL, return the next registered bitstream filter
5084 * after f, or NULL if f is the last one.
5086 * This function can be used to iterate over all registered bitstream
5089 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5094 * Same behaviour av_fast_malloc but the buffer has additional
5095 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5097 * In addition the whole buffer will initially and after resizes
5098 * be 0-initialized so that no uninitialized data will ever appear.
5100 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5103 * Same behaviour av_fast_padded_malloc except that buffer will always
5104 * be 0-initialized after call.
5106 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5109 * Encode extradata length to a buffer. Used by xiph codecs.
5111 * @param s buffer to write to; must be at least (v/255+1) bytes long
5112 * @param v size of extradata in bytes
5113 * @return number of bytes written to the buffer.
5115 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5117 #if FF_API_MISSING_SAMPLE
5119 * Log a generic warning message about a missing feature. This function is
5120 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5121 * only, and would normally not be used by applications.
5122 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5123 * a pointer to an AVClass struct
5124 * @param[in] feature string containing the name of the missing feature
5125 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5126 * If want_sample is non-zero, additional verbage will be added to the log
5127 * message which tells the user how to report samples to the development
5129 * @deprecated Use avpriv_report_missing_feature() instead.
5131 attribute_deprecated
5132 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5135 * Log a generic warning message asking for a sample. This function is
5136 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5137 * only, and would normally not be used by applications.
5138 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5139 * a pointer to an AVClass struct
5140 * @param[in] msg string containing an optional message, or NULL if no message
5141 * @deprecated Use avpriv_request_sample() instead.
5143 attribute_deprecated
5144 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5145 #endif /* FF_API_MISSING_SAMPLE */
5148 * Register the hardware accelerator hwaccel.
5150 void av_register_hwaccel(AVHWAccel *hwaccel);
5153 * If hwaccel is NULL, returns the first registered hardware accelerator,
5154 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5155 * after hwaccel, or NULL if hwaccel is the last one.
5157 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5161 * Lock operation used by lockmgr
5164 AV_LOCK_CREATE, ///< Create a mutex
5165 AV_LOCK_OBTAIN, ///< Lock the mutex
5166 AV_LOCK_RELEASE, ///< Unlock the mutex
5167 AV_LOCK_DESTROY, ///< Free mutex resources
5171 * Register a user provided lock manager supporting the operations
5172 * specified by AVLockOp. The "mutex" argument to the function points
5173 * to a (void *) where the lockmgr should store/get a pointer to a user
5174 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5175 * value left by the last call for all other ops. If the lock manager is
5176 * unable to perform the op then it should leave the mutex in the same
5177 * state as when it was called and return a non-zero value. However,
5178 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5179 * have been successfully destroyed. If av_lockmgr_register succeeds
5180 * it will return a non-negative value, if it fails it will return a
5181 * negative value and destroy all mutex and unregister all callbacks.
5182 * av_lockmgr_register is not thread-safe, it must be called from a
5183 * single thread before any calls which make use of locking are used.
5185 * @param cb User defined callback. av_lockmgr_register invokes calls
5186 * to this callback and the previously registered callback.
5187 * The callback will be used to create more than one mutex
5188 * each of which must be backed by its own underlying locking
5189 * mechanism (i.e. do not use a single static object to
5190 * implement your lock manager). If cb is set to NULL the
5191 * lockmgr will be unregistered.
5193 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5196 * Get the type of the given codec.
5198 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5201 * Get the name of a codec.
5202 * @return a static string identifying the codec; never NULL
5204 const char *avcodec_get_name(enum AVCodecID id);
5207 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5208 * with no corresponding avcodec_close()), 0 otherwise.
5210 int avcodec_is_open(AVCodecContext *s);
5213 * @return a non-zero number if codec is an encoder, zero otherwise
5215 int av_codec_is_encoder(const AVCodec *codec);
5218 * @return a non-zero number if codec is a decoder, zero otherwise
5220 int av_codec_is_decoder(const AVCodec *codec);
5223 * @return descriptor for given codec ID or NULL if no descriptor exists.
5225 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5228 * Iterate over all codec descriptors known to libavcodec.
5230 * @param prev previous descriptor. NULL to get the first descriptor.
5232 * @return next descriptor or NULL after the last descriptor
5234 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5237 * @return codec descriptor with the given name or NULL if no such descriptor
5240 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5246 #endif /* AVCODEC_AVCODEC_H */