2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
46 * @defgroup libavc Encoding/Decoding Library
49 * @defgroup lavc_decoding Decoding
53 * @defgroup lavc_encoding Encoding
57 * @defgroup lavc_codec Codecs
59 * @defgroup lavc_codec_native Native Codecs
62 * @defgroup lavc_codec_wrappers External library wrappers
65 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
69 * @defgroup lavc_internal Internal
77 * @defgroup lavc_core Core functions/structures.
80 * Basic definitions, functions for querying libavcodec capabilities,
81 * allocating core structures, etc.
87 * Identify the syntax and semantics of the bitstream.
88 * The principle is roughly:
89 * Two decoders with the same ID can decode the same streams.
90 * Two encoders with the same ID can encode compatible streams.
91 * There may be slight deviations from the principle due to implementation
94 * If you add a codec ID to this list, add it so that
95 * 1. no value of a existing codec ID changes (that would break ABI),
96 * 2. it is as close as possible to similar codecs
98 * After adding new codec IDs, do not forget to add an entry to the codec
99 * descriptor list and bump libavcodec minor version.
105 AV_CODEC_ID_MPEG1VIDEO,
106 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
108 AV_CODEC_ID_MPEG2VIDEO_XVMC,
109 #endif /* FF_API_XVMC */
120 AV_CODEC_ID_RAWVIDEO,
121 AV_CODEC_ID_MSMPEG4V1,
122 AV_CODEC_ID_MSMPEG4V2,
123 AV_CODEC_ID_MSMPEG4V3,
146 AV_CODEC_ID_INTERPLAY_VIDEO,
153 AV_CODEC_ID_MSVIDEO1,
158 AV_CODEC_ID_TRUEMOTION1,
159 AV_CODEC_ID_VMDVIDEO,
184 AV_CODEC_ID_TRUEMOTION2,
190 AV_CODEC_ID_SMACKVIDEO,
195 AV_CODEC_ID_JPEG2000,
201 AV_CODEC_ID_DSICINVIDEO,
202 AV_CODEC_ID_TIERTEXSEQVIDEO,
210 AV_CODEC_ID_BETHSOFTVID,
222 AV_CODEC_ID_ESCAPE124,
226 AV_CODEC_ID_MOTIONPIXELS,
238 AV_CODEC_ID_FLASHSV2,
239 AV_CODEC_ID_CDGRAPHICS,
242 AV_CODEC_ID_BINKVIDEO,
243 AV_CODEC_ID_IFF_ILBM,
244 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
250 AV_CODEC_ID_A64_MULTI,
251 AV_CODEC_ID_A64_MULTI5,
254 AV_CODEC_ID_LAGARITH,
258 AV_CODEC_ID_WMV3IMAGE,
259 AV_CODEC_ID_VC1IMAGE,
261 AV_CODEC_ID_BMV_VIDEO,
268 AV_CODEC_ID_ZEROCODEC,
277 AV_CODEC_ID_ESCAPE130,
280 AV_CODEC_ID_HNM4_VIDEO,
282 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
284 AV_CODEC_ID_ALIAS_PIX,
285 AV_CODEC_ID_BRENDER_PIX,
286 AV_CODEC_ID_PAF_VIDEO,
299 AV_CODEC_ID_SCREENPRESSO,
302 AV_CODEC_ID_Y41P = 0x8000,
307 AV_CODEC_ID_TARGA_Y216,
319 /* various PCM "codecs" */
320 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
321 AV_CODEC_ID_PCM_S16LE = 0x10000,
322 AV_CODEC_ID_PCM_S16BE,
323 AV_CODEC_ID_PCM_U16LE,
324 AV_CODEC_ID_PCM_U16BE,
327 AV_CODEC_ID_PCM_MULAW,
328 AV_CODEC_ID_PCM_ALAW,
329 AV_CODEC_ID_PCM_S32LE,
330 AV_CODEC_ID_PCM_S32BE,
331 AV_CODEC_ID_PCM_U32LE,
332 AV_CODEC_ID_PCM_U32BE,
333 AV_CODEC_ID_PCM_S24LE,
334 AV_CODEC_ID_PCM_S24BE,
335 AV_CODEC_ID_PCM_U24LE,
336 AV_CODEC_ID_PCM_U24BE,
337 AV_CODEC_ID_PCM_S24DAUD,
338 AV_CODEC_ID_PCM_ZORK,
339 AV_CODEC_ID_PCM_S16LE_PLANAR,
341 AV_CODEC_ID_PCM_F32BE,
342 AV_CODEC_ID_PCM_F32LE,
343 AV_CODEC_ID_PCM_F64BE,
344 AV_CODEC_ID_PCM_F64LE,
345 AV_CODEC_ID_PCM_BLURAY,
348 AV_CODEC_ID_PCM_S8_PLANAR,
349 AV_CODEC_ID_PCM_S24LE_PLANAR,
350 AV_CODEC_ID_PCM_S32LE_PLANAR,
351 AV_CODEC_ID_PCM_S16BE_PLANAR,
352 /* new PCM "codecs" should be added right below this line starting with
353 * an explicit value of for example 0x10800
356 /* various ADPCM codecs */
357 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
358 AV_CODEC_ID_ADPCM_IMA_WAV,
359 AV_CODEC_ID_ADPCM_IMA_DK3,
360 AV_CODEC_ID_ADPCM_IMA_DK4,
361 AV_CODEC_ID_ADPCM_IMA_WS,
362 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
363 AV_CODEC_ID_ADPCM_MS,
364 AV_CODEC_ID_ADPCM_4XM,
365 AV_CODEC_ID_ADPCM_XA,
366 AV_CODEC_ID_ADPCM_ADX,
367 AV_CODEC_ID_ADPCM_EA,
368 AV_CODEC_ID_ADPCM_G726,
369 AV_CODEC_ID_ADPCM_CT,
370 AV_CODEC_ID_ADPCM_SWF,
371 AV_CODEC_ID_ADPCM_YAMAHA,
372 AV_CODEC_ID_ADPCM_SBPRO_4,
373 AV_CODEC_ID_ADPCM_SBPRO_3,
374 AV_CODEC_ID_ADPCM_SBPRO_2,
375 AV_CODEC_ID_ADPCM_THP,
376 AV_CODEC_ID_ADPCM_IMA_AMV,
377 AV_CODEC_ID_ADPCM_EA_R1,
378 AV_CODEC_ID_ADPCM_EA_R3,
379 AV_CODEC_ID_ADPCM_EA_R2,
380 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
381 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
382 AV_CODEC_ID_ADPCM_EA_XAS,
383 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
384 AV_CODEC_ID_ADPCM_IMA_ISS,
385 AV_CODEC_ID_ADPCM_G722,
386 AV_CODEC_ID_ADPCM_IMA_APC,
387 AV_CODEC_ID_ADPCM_VIMA,
388 #if FF_API_VIMA_DECODER
389 AV_CODEC_ID_VIMA = AV_CODEC_ID_ADPCM_VIMA,
392 AV_CODEC_ID_ADPCM_AFC = 0x11800,
393 AV_CODEC_ID_ADPCM_IMA_OKI,
394 AV_CODEC_ID_ADPCM_DTK,
395 AV_CODEC_ID_ADPCM_IMA_RAD,
396 AV_CODEC_ID_ADPCM_G726LE,
397 AV_CODEC_ID_ADPCM_THP_LE,
398 AV_CODEC_ID_ADPCM_PSX,
399 AV_CODEC_ID_ADPCM_AICA,
402 AV_CODEC_ID_AMR_NB = 0x12000,
405 /* RealAudio codecs*/
406 AV_CODEC_ID_RA_144 = 0x13000,
409 /* various DPCM codecs */
410 AV_CODEC_ID_ROQ_DPCM = 0x14000,
411 AV_CODEC_ID_INTERPLAY_DPCM,
412 AV_CODEC_ID_XAN_DPCM,
413 AV_CODEC_ID_SOL_DPCM,
415 AV_CODEC_ID_SDX2_DPCM = 0x14800,
418 AV_CODEC_ID_MP2 = 0x15000,
419 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
429 AV_CODEC_ID_VMDAUDIO,
435 AV_CODEC_ID_WESTWOOD_SND1,
436 AV_CODEC_ID_GSM, ///< as in Berlin toast format
439 AV_CODEC_ID_TRUESPEECH,
441 AV_CODEC_ID_SMACKAUDIO,
444 AV_CODEC_ID_DSICINAUDIO,
446 AV_CODEC_ID_MUSEPACK7,
448 AV_CODEC_ID_GSM_MS, /* as found in WAV */
454 AV_CODEC_ID_NELLYMOSER,
455 AV_CODEC_ID_MUSEPACK8,
457 AV_CODEC_ID_WMAVOICE,
459 AV_CODEC_ID_WMALOSSLESS,
468 AV_CODEC_ID_BINKAUDIO_RDFT,
469 AV_CODEC_ID_BINKAUDIO_DCT,
470 AV_CODEC_ID_AAC_LATM,
475 AV_CODEC_ID_8SVX_EXP,
476 AV_CODEC_ID_8SVX_FIB,
477 AV_CODEC_ID_BMV_AUDIO,
482 AV_CODEC_ID_COMFORT_NOISE,
484 AV_CODEC_ID_METASOUND,
485 AV_CODEC_ID_PAF_AUDIO,
489 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
491 AV_CODEC_ID_SONIC_LS,
494 AV_CODEC_ID_DSD_LSBF,
495 AV_CODEC_ID_DSD_MSBF,
496 AV_CODEC_ID_DSD_LSBF_PLANAR,
497 AV_CODEC_ID_DSD_MSBF_PLANAR,
499 AV_CODEC_ID_INTERPLAY_ACM,
503 /* subtitle codecs */
504 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
505 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
506 AV_CODEC_ID_DVB_SUBTITLE,
507 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
510 AV_CODEC_ID_MOV_TEXT,
511 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
512 AV_CODEC_ID_DVB_TELETEXT,
515 AV_CODEC_ID_MICRODVD = 0x17800,
519 AV_CODEC_ID_REALTEXT,
521 AV_CODEC_ID_SUBVIEWER1,
522 AV_CODEC_ID_SUBVIEWER,
529 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
531 /* other specific kind of codecs (generally used for attachments) */
532 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
533 AV_CODEC_ID_TTF = 0x18000,
535 AV_CODEC_ID_BINTEXT = 0x18800,
539 AV_CODEC_ID_SMPTE_KLV,
541 AV_CODEC_ID_TIMED_ID3,
542 AV_CODEC_ID_BIN_DATA,
545 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
547 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
548 * stream (only used by libavformat) */
549 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
550 * stream (only used by libavformat) */
551 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
552 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
556 * This struct describes the properties of a single codec described by an
558 * @see avcodec_descriptor_get()
560 typedef struct AVCodecDescriptor {
562 enum AVMediaType type;
564 * Name of the codec described by this descriptor. It is non-empty and
565 * unique for each codec descriptor. It should contain alphanumeric
566 * characters and '_' only.
570 * A more descriptive name for this codec. May be NULL.
572 const char *long_name;
574 * Codec properties, a combination of AV_CODEC_PROP_* flags.
579 * MIME type(s) associated with the codec.
580 * May be NULL; if not, a NULL-terminated array of MIME types.
581 * The first item is always non-NULL and is the preferred MIME type.
583 const char *const *mime_types;
587 * Codec uses only intra compression.
590 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
592 * Codec supports lossy compression. Audio and video codecs only.
593 * @note a codec may support both lossy and lossless
596 #define AV_CODEC_PROP_LOSSY (1 << 1)
598 * Codec supports lossless compression. Audio and video codecs only.
600 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
602 * Codec supports frame reordering. That is, the coded order (the order in which
603 * the encoded packets are output by the encoders / stored / input to the
604 * decoders) may be different from the presentation order of the corresponding
607 * For codecs that do not have this property set, PTS and DTS should always be
610 #define AV_CODEC_PROP_REORDER (1 << 3)
612 * Subtitle codec is bitmap based
613 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
615 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
617 * Subtitle codec is text based.
618 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
620 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
623 * @ingroup lavc_decoding
624 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
625 * This is mainly needed because some optimized bitstream readers read
626 * 32 or 64 bit at once and could read over the end.<br>
627 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
628 * MPEG bitstreams could cause overread and segfault.
630 #define AV_INPUT_BUFFER_PADDING_SIZE 32
633 * @ingroup lavc_encoding
634 * minimum encoding buffer size
635 * Used to avoid some checks during header writing.
637 #define AV_INPUT_BUFFER_MIN_SIZE 16384
639 #if FF_API_WITHOUT_PREFIX
641 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
643 #define FF_INPUT_BUFFER_PADDING_SIZE 32
646 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
648 #define FF_MIN_BUFFER_SIZE 16384
649 #endif /* FF_API_WITHOUT_PREFIX */
652 * @ingroup lavc_encoding
653 * motion estimation type.
654 * @deprecated use codec private option instead
656 #if FF_API_MOTION_EST
658 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
662 ME_EPZS, ///< enhanced predictive zonal search
663 ME_X1, ///< reserved for experiments
664 ME_HEX, ///< hexagon based search
665 ME_UMH, ///< uneven multi-hexagon search
666 ME_TESA, ///< transformed exhaustive search algorithm
667 ME_ITER=50, ///< iterative search
672 * @ingroup lavc_decoding
675 /* We leave some space between them for extensions (drop some
676 * keyframes for intra-only or drop just some bidir frames). */
677 AVDISCARD_NONE =-16, ///< discard nothing
678 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
679 AVDISCARD_NONREF = 8, ///< discard all non reference
680 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
681 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
682 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
683 AVDISCARD_ALL = 48, ///< discard all
686 enum AVAudioServiceType {
687 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
688 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
689 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
690 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
691 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
692 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
693 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
694 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
695 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
696 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
700 * @ingroup lavc_encoding
702 typedef struct RcOverride{
705 int qscale; // If this is 0 then quality_factor will be used instead.
706 float quality_factor;
709 #if FF_API_MAX_BFRAMES
711 * @deprecated there is no libavcodec-wide limit on the number of B-frames
713 #define FF_MAX_B_FRAMES 16
717 These flags can be passed in AVCodecContext.flags before initialization.
718 Note: Not everything is supported yet.
722 * Allow decoders to produce frames with data planes that are not aligned
723 * to CPU requirements (e.g. due to cropping).
725 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
729 #define AV_CODEC_FLAG_QSCALE (1 << 1)
731 * 4 MV per MB allowed / advanced prediction for H.263.
733 #define AV_CODEC_FLAG_4MV (1 << 2)
735 * Output even those frames that might be corrupted.
737 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
741 #define AV_CODEC_FLAG_QPEL (1 << 4)
743 * Use internal 2pass ratecontrol in first pass mode.
745 #define AV_CODEC_FLAG_PASS1 (1 << 9)
747 * Use internal 2pass ratecontrol in second pass mode.
749 #define AV_CODEC_FLAG_PASS2 (1 << 10)
753 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
755 * Only decode/encode grayscale.
757 #define AV_CODEC_FLAG_GRAY (1 << 13)
759 * error[?] variables will be set during encoding.
761 #define AV_CODEC_FLAG_PSNR (1 << 15)
763 * Input bitstream might be truncated at a random location
764 * instead of only at frame boundaries.
766 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
768 * Use interlaced DCT.
770 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
774 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
776 * Place global headers in extradata instead of every keyframe.
778 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
780 * Use only bitexact stuff (except (I)DCT).
782 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
783 /* Fx : Flag for h263+ extra options */
785 * H.263 advanced intra coding / MPEG-4 AC prediction
787 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
789 * interlaced motion estimation
791 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
792 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
795 * Allow non spec compliant speedup tricks.
797 #define AV_CODEC_FLAG2_FAST (1 << 0)
799 * Skip bitstream encoding.
801 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
803 * Place global headers at every keyframe instead of in extradata.
805 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
808 * timecode is in drop frame format. DEPRECATED!!!!
810 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
813 * Input bitstream might be truncated at a packet boundaries
814 * instead of only at frame boundaries.
816 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
818 * Discard cropping information from SPS.
820 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
823 * Show all frames before the first keyframe
825 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
827 * Export motion vectors through frame side data
829 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
831 * Do not skip samples and export skip information as frame side data
833 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
835 /* Unsupported options :
836 * Syntax Arithmetic coding (SAC)
837 * Reference Picture Selection
838 * Independent Segment Decoding */
840 /* codec capabilities */
843 * Decoder can use draw_horiz_band callback.
845 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
847 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
848 * If not set, it might not use get_buffer() at all or use operations that
849 * assume the buffer was allocated by avcodec_default_get_buffer.
851 #define AV_CODEC_CAP_DR1 (1 << 1)
852 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
854 * Encoder or decoder requires flushing with NULL input at the end in order to
855 * give the complete and correct output.
857 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
858 * with NULL data. The user can still send NULL data to the public encode
859 * or decode function, but libavcodec will not pass it along to the codec
860 * unless this flag is set.
863 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
864 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
868 * The encoder needs to be fed with NULL data at the end of encoding until the
869 * encoder no longer returns data.
871 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
872 * flag also means that the encoder must set the pts and duration for
873 * each output packet. If this flag is not set, the pts and duration will
874 * be determined by libavcodec from the input frame.
876 #define AV_CODEC_CAP_DELAY (1 << 5)
878 * Codec can be fed a final frame with a smaller size.
879 * This can be used to prevent truncation of the last audio samples.
881 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
885 * Codec can export data for HW decoding (VDPAU).
887 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
891 * Codec can output multiple frames per AVPacket
892 * Normally demuxers return one frame at a time, demuxers which do not do
893 * are connected to a parser to split what they return into proper frames.
894 * This flag is reserved to the very rare category of codecs which have a
895 * bitstream that cannot be split into frames without timeconsuming
896 * operations like full decoding. Demuxers carring such bitstreams thus
897 * may return multiple frames in a packet. This has many disadvantages like
898 * prohibiting stream copy in many cases thus it should only be considered
901 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
903 * Codec is experimental and is thus avoided in favor of non experimental
906 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
908 * Codec should fill in channel configuration and samplerate instead of container
910 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
912 * Codec supports frame-level multithreading.
914 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
916 * Codec supports slice-based (or partition-based) multithreading.
918 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
920 * Codec supports changed parameters at any point.
922 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
924 * Codec supports avctx->thread_count == 0 (auto).
926 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
928 * Audio encoder supports receiving a different number of samples in each call.
930 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
932 * Codec is intra only.
934 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
938 #define AV_CODEC_CAP_LOSSLESS 0x80000000
941 #if FF_API_WITHOUT_PREFIX
943 * Allow decoders to produce frames with data planes that are not aligned
944 * to CPU requirements (e.g. due to cropping).
946 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
947 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
948 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
949 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
950 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
953 * @deprecated use the "gmc" private option of the libxvid encoder
955 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
959 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
962 #define CODEC_FLAG_MV0 0x0040
964 #if FF_API_INPUT_PRESERVED
966 * @deprecated passing reference-counted frames to the encoders replaces this
969 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
971 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
972 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
973 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
976 * @deprecated edges are not used/required anymore. I.e. this flag is now always
979 #define CODEC_FLAG_EMU_EDGE 0x4000
981 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
982 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
984 #if FF_API_NORMALIZE_AQP
986 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
989 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
991 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
992 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
993 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
994 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
995 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
996 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
997 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
998 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
999 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1000 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1001 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1002 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1003 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1005 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1006 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1007 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1008 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1010 /* Unsupported options :
1011 * Syntax Arithmetic coding (SAC)
1012 * Reference Picture Selection
1013 * Independent Segment Decoding */
1015 /* codec capabilities */
1017 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1019 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1020 * If not set, it might not use get_buffer() at all or use operations that
1021 * assume the buffer was allocated by avcodec_default_get_buffer.
1023 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1024 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1026 /* Codec can export data for HW decoding. This flag indicates that
1027 * the codec would call get_format() with list that might contain HW accelerated
1028 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1029 * including raw image format.
1030 * The application can use the passed context to determine bitstream version,
1031 * chroma format, resolution etc.
1033 #define CODEC_CAP_HWACCEL 0x0010
1034 #endif /* FF_API_XVMC */
1036 * Encoder or decoder requires flushing with NULL input at the end in order to
1037 * give the complete and correct output.
1039 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1040 * with NULL data. The user can still send NULL data to the public encode
1041 * or decode function, but libavcodec will not pass it along to the codec
1042 * unless this flag is set.
1045 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1046 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1050 * The encoder needs to be fed with NULL data at the end of encoding until the
1051 * encoder no longer returns data.
1053 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1054 * flag also means that the encoder must set the pts and duration for
1055 * each output packet. If this flag is not set, the pts and duration will
1056 * be determined by libavcodec from the input frame.
1058 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1060 * Codec can be fed a final frame with a smaller size.
1061 * This can be used to prevent truncation of the last audio samples.
1063 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1064 #if FF_API_CAP_VDPAU
1066 * Codec can export data for HW decoding (VDPAU).
1068 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1071 * Codec can output multiple frames per AVPacket
1072 * Normally demuxers return one frame at a time, demuxers which do not do
1073 * are connected to a parser to split what they return into proper frames.
1074 * This flag is reserved to the very rare category of codecs which have a
1075 * bitstream that cannot be split into frames without timeconsuming
1076 * operations like full decoding. Demuxers carring such bitstreams thus
1077 * may return multiple frames in a packet. This has many disadvantages like
1078 * prohibiting stream copy in many cases thus it should only be considered
1081 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1083 * Codec is experimental and is thus avoided in favor of non experimental
1086 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1088 * Codec should fill in channel configuration and samplerate instead of container
1090 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1091 #if FF_API_NEG_LINESIZES
1093 * @deprecated no codecs use this capability
1095 #define CODEC_CAP_NEG_LINESIZES 0x0800
1098 * Codec supports frame-level multithreading.
1100 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1102 * Codec supports slice-based (or partition-based) multithreading.
1104 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1106 * Codec supports changed parameters at any point.
1108 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1110 * Codec supports avctx->thread_count == 0 (auto).
1112 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1114 * Audio encoder supports receiving a different number of samples in each call.
1116 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1118 * Codec is intra only.
1120 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1122 * Codec is lossless.
1124 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1127 * HWAccel is experimental and is thus avoided in favor of non experimental
1130 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1131 #endif /* FF_API_WITHOUT_PREFIX */
1134 //The following defines may change, don't expect compatibility if you use them.
1135 #define MB_TYPE_INTRA4x4 0x0001
1136 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1137 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1138 #define MB_TYPE_16x16 0x0008
1139 #define MB_TYPE_16x8 0x0010
1140 #define MB_TYPE_8x16 0x0020
1141 #define MB_TYPE_8x8 0x0040
1142 #define MB_TYPE_INTERLACED 0x0080
1143 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1144 #define MB_TYPE_ACPRED 0x0200
1145 #define MB_TYPE_GMC 0x0400
1146 #define MB_TYPE_SKIP 0x0800
1147 #define MB_TYPE_P0L0 0x1000
1148 #define MB_TYPE_P1L0 0x2000
1149 #define MB_TYPE_P0L1 0x4000
1150 #define MB_TYPE_P1L1 0x8000
1151 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1152 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1153 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1154 #define MB_TYPE_QUANT 0x00010000
1155 #define MB_TYPE_CBP 0x00020000
1156 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1161 * This specifies the area which should be displayed.
1162 * Note there may be multiple such areas for one frame.
1164 typedef struct AVPanScan{
1167 * - encoding: Set by user.
1168 * - decoding: Set by libavcodec.
1173 * width and height in 1/16 pel
1174 * - encoding: Set by user.
1175 * - decoding: Set by libavcodec.
1181 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1182 * - encoding: Set by user.
1183 * - decoding: Set by libavcodec.
1185 int16_t position[3][2];
1188 #if FF_API_QSCALE_TYPE
1189 #define FF_QSCALE_TYPE_MPEG1 0
1190 #define FF_QSCALE_TYPE_MPEG2 1
1191 #define FF_QSCALE_TYPE_H264 2
1192 #define FF_QSCALE_TYPE_VP56 3
1196 * The decoder will keep a reference to the frame and may reuse it later.
1198 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1201 * @defgroup lavc_packet AVPacket
1203 * Types and functions for working with AVPacket.
1206 enum AVPacketSideDataType {
1207 AV_PKT_DATA_PALETTE,
1208 AV_PKT_DATA_NEW_EXTRADATA,
1211 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1214 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1215 * s32le channel_count
1216 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1217 * u64le channel_layout
1218 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1220 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1225 AV_PKT_DATA_PARAM_CHANGE,
1228 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1229 * structures with info about macroblocks relevant to splitting the
1230 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1231 * That is, it does not necessarily contain info about all macroblocks,
1232 * as long as the distance between macroblocks in the info is smaller
1233 * than the target payload size.
1234 * Each MB info structure is 12 bytes, and is laid out as follows:
1236 * u32le bit offset from the start of the packet
1237 * u8 current quantizer at the start of the macroblock
1239 * u16le macroblock address within the GOB
1240 * u8 horizontal MV predictor
1241 * u8 vertical MV predictor
1242 * u8 horizontal MV predictor for block number 3
1243 * u8 vertical MV predictor for block number 3
1246 AV_PKT_DATA_H263_MB_INFO,
1249 * This side data should be associated with an audio stream and contains
1250 * ReplayGain information in form of the AVReplayGain struct.
1252 AV_PKT_DATA_REPLAYGAIN,
1255 * This side data contains a 3x3 transformation matrix describing an affine
1256 * transformation that needs to be applied to the decoded video frames for
1257 * correct presentation.
1259 * See libavutil/display.h for a detailed description of the data.
1261 AV_PKT_DATA_DISPLAYMATRIX,
1264 * This side data should be associated with a video stream and contains
1265 * Stereoscopic 3D information in form of the AVStereo3D struct.
1267 AV_PKT_DATA_STEREO3D,
1270 * This side data should be associated with an audio stream and corresponds
1271 * to enum AVAudioServiceType.
1273 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1276 * This side data contains quality related information from the encoder.
1278 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1282 * u64le[error count] sum of squared differences between encoder in and output
1285 AV_PKT_DATA_QUALITY_STATS,
1288 * Recommmends skipping the specified number of samples
1290 * u32le number of samples to skip from start of this packet
1291 * u32le number of samples to skip from end of this packet
1292 * u8 reason for start skip
1293 * u8 reason for end skip (0=padding silence, 1=convergence)
1296 AV_PKT_DATA_SKIP_SAMPLES=70,
1299 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1300 * the packet may contain "dual mono" audio specific to Japanese DTV
1301 * and if it is true, recommends only the selected channel to be used.
1303 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1306 AV_PKT_DATA_JP_DUALMONO,
1309 * A list of zero terminated key/value strings. There is no end marker for
1310 * the list, so it is required to rely on the side data size to stop.
1312 AV_PKT_DATA_STRINGS_METADATA,
1315 * Subtitle event position
1323 AV_PKT_DATA_SUBTITLE_POSITION,
1326 * Data found in BlockAdditional element of matroska container. There is
1327 * no end marker for the data, so it is required to rely on the side data
1328 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1331 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1334 * The optional first identifier line of a WebVTT cue.
1336 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1339 * The optional settings (rendering instructions) that immediately
1340 * follow the timestamp specifier of a WebVTT cue.
1342 AV_PKT_DATA_WEBVTT_SETTINGS,
1345 * A list of zero terminated key/value strings. There is no end marker for
1346 * the list, so it is required to rely on the side data size to stop. This
1347 * side data includes updated metadata which appeared in the stream.
1349 AV_PKT_DATA_METADATA_UPDATE,
1352 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1354 typedef struct AVPacketSideData {
1357 enum AVPacketSideDataType type;
1361 * This structure stores compressed data. It is typically exported by demuxers
1362 * and then passed as input to decoders, or received as output from encoders and
1363 * then passed to muxers.
1365 * For video, it should typically contain one compressed frame. For audio it may
1366 * contain several compressed frames. Encoders are allowed to output empty
1367 * packets, with no compressed data, containing only side data
1368 * (e.g. to update some stream parameters at the end of encoding).
1370 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1371 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1372 * without libavcodec and libavformat major bump.
1374 * The semantics of data ownership depends on the buf field.
1375 * If it is set, the packet data is dynamically allocated and is
1376 * valid indefinitely until a call to av_packet_unref() reduces the
1377 * reference count to 0.
1379 * If the buf field is not set av_packet_ref() would make a copy instead
1380 * of increasing the reference count.
1382 * The side data is always allocated with av_malloc(), copied by
1383 * av_packet_ref() and freed by av_packet_unref().
1385 * @see av_packet_ref
1386 * @see av_packet_unref
1388 typedef struct AVPacket {
1390 * A reference to the reference-counted buffer where the packet data is
1392 * May be NULL, then the packet data is not reference-counted.
1396 * Presentation timestamp in AVStream->time_base units; the time at which
1397 * the decompressed packet will be presented to the user.
1398 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1399 * pts MUST be larger or equal to dts as presentation cannot happen before
1400 * decompression, unless one wants to view hex dumps. Some formats misuse
1401 * the terms dts and pts/cts to mean something different. Such timestamps
1402 * must be converted to true pts/dts before they are stored in AVPacket.
1406 * Decompression timestamp in AVStream->time_base units; the time at which
1407 * the packet is decompressed.
1408 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1415 * A combination of AV_PKT_FLAG values
1419 * Additional packet data that can be provided by the container.
1420 * Packet can contain several types of side information.
1422 AVPacketSideData *side_data;
1423 int side_data_elems;
1426 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1427 * Equals next_pts - this_pts in presentation order.
1431 int64_t pos; ///< byte position in stream, -1 if unknown
1433 #if FF_API_CONVERGENCE_DURATION
1435 * @deprecated Same as the duration field, but as int64_t. This was required
1436 * for Matroska subtitles, whose duration values could overflow when the
1437 * duration field was still an int.
1439 attribute_deprecated
1440 int64_t convergence_duration;
1443 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1444 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1446 enum AVSideDataParamChangeFlags {
1447 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1448 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1449 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1450 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1456 struct AVCodecInternal;
1460 AV_FIELD_PROGRESSIVE,
1461 AV_FIELD_TT, //< Top coded_first, top displayed first
1462 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1463 AV_FIELD_TB, //< Top coded first, bottom displayed first
1464 AV_FIELD_BT, //< Bottom coded first, top displayed first
1468 * main external API structure.
1469 * New fields can be added to the end with minor version bumps.
1470 * Removal, reordering and changes to existing fields require a major
1472 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1474 * sizeof(AVCodecContext) must not be used outside libav*.
1476 typedef struct AVCodecContext {
1478 * information on struct for av_log
1479 * - set by avcodec_alloc_context3
1481 const AVClass *av_class;
1482 int log_level_offset;
1484 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1485 const struct AVCodec *codec;
1486 #if FF_API_CODEC_NAME
1488 * @deprecated this field is not used for anything in libavcodec
1490 attribute_deprecated
1491 char codec_name[32];
1493 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1496 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1497 * This is used to work around some encoder bugs.
1498 * A demuxer should set this to what is stored in the field used to identify the codec.
1499 * If there are multiple such fields in a container then the demuxer should choose the one
1500 * which maximizes the information about the used codec.
1501 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1502 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1503 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1505 * - encoding: Set by user, if not then the default based on codec_id will be used.
1506 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1508 unsigned int codec_tag;
1510 #if FF_API_STREAM_CODEC_TAG
1512 * @deprecated this field is unused
1514 attribute_deprecated
1515 unsigned int stream_codec_tag;
1521 * Private context used for internal data.
1523 * Unlike priv_data, this is not codec-specific. It is used in general
1524 * libavcodec functions.
1526 struct AVCodecInternal *internal;
1529 * Private data of the user, can be used to carry app specific stuff.
1530 * - encoding: Set by user.
1531 * - decoding: Set by user.
1536 * the average bitrate
1537 * - encoding: Set by user; unused for constant quantizer encoding.
1538 * - decoding: Set by user, may be overwritten by libavcodec
1539 * if this info is available in the stream
1544 * number of bits the bitstream is allowed to diverge from the reference.
1545 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1546 * - encoding: Set by user; unused for constant quantizer encoding.
1547 * - decoding: unused
1549 int bit_rate_tolerance;
1552 * Global quality for codecs which cannot change it per frame.
1553 * This should be proportional to MPEG-1/2/4 qscale.
1554 * - encoding: Set by user.
1555 * - decoding: unused
1560 * - encoding: Set by user.
1561 * - decoding: unused
1563 int compression_level;
1564 #define FF_COMPRESSION_DEFAULT -1
1568 * - encoding: Set by user.
1569 * - decoding: Set by user.
1575 * - encoding: Set by user.
1576 * - decoding: Set by user.
1581 * some codecs need / can use extradata like Huffman tables.
1582 * mjpeg: Huffman tables
1583 * rv10: additional flags
1584 * mpeg4: global headers (they can be in the bitstream or here)
1585 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1586 * than extradata_size to avoid problems if it is read with the bitstream reader.
1587 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1588 * - encoding: Set/allocated/freed by libavcodec.
1589 * - decoding: Set/allocated/freed by user.
1595 * This is the fundamental unit of time (in seconds) in terms
1596 * of which frame timestamps are represented. For fixed-fps content,
1597 * timebase should be 1/framerate and timestamp increments should be
1599 * This often, but not always is the inverse of the frame rate or field rate
1601 * - encoding: MUST be set by user.
1602 * - decoding: the use of this field for decoding is deprecated.
1603 * Use framerate instead.
1605 AVRational time_base;
1608 * For some codecs, the time base is closer to the field rate than the frame rate.
1609 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1610 * if no telecine is used ...
1612 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1614 int ticks_per_frame;
1619 * Encoding: Number of frames delay there will be from the encoder input to
1620 * the decoder output. (we assume the decoder matches the spec)
1621 * Decoding: Number of frames delay in addition to what a standard decoder
1622 * as specified in the spec would produce.
1625 * Number of frames the decoded output will be delayed relative to the
1629 * For encoding, this field is unused (see initial_padding).
1631 * For decoding, this is the number of samples the decoder needs to
1632 * output before the decoder's output is valid. When seeking, you should
1633 * start decoding this many samples prior to your desired seek point.
1635 * - encoding: Set by libavcodec.
1636 * - decoding: Set by libavcodec.
1643 * picture width / height.
1645 * @note Those fields may not match the values of the last
1646 * AVFrame outputted by avcodec_decode_video2 due frame
1649 * - encoding: MUST be set by user.
1650 * - decoding: May be set by the user before opening the decoder if known e.g.
1651 * from the container. Some decoders will require the dimensions
1652 * to be set by the caller. During decoding, the decoder may
1653 * overwrite those values as required while parsing the data.
1658 * Bitstream width / height, may be different from width/height e.g. when
1659 * the decoded frame is cropped before being output or lowres is enabled.
1661 * @note Those field may not match the value of the last
1662 * AVFrame outputted by avcodec_decode_video2 due frame
1665 * - encoding: unused
1666 * - decoding: May be set by the user before opening the decoder if known
1667 * e.g. from the container. During decoding, the decoder may
1668 * overwrite those values as required while parsing the data.
1670 int coded_width, coded_height;
1672 #if FF_API_ASPECT_EXTENDED
1673 #define FF_ASPECT_EXTENDED 15
1677 * the number of pictures in a group of pictures, or 0 for intra_only
1678 * - encoding: Set by user.
1679 * - decoding: unused
1684 * Pixel format, see AV_PIX_FMT_xxx.
1685 * May be set by the demuxer if known from headers.
1686 * May be overridden by the decoder if it knows better.
1688 * @note This field may not match the value of the last
1689 * AVFrame outputted by avcodec_decode_video2 due frame
1692 * - encoding: Set by user.
1693 * - decoding: Set by user if known, overridden by libavcodec while
1696 enum AVPixelFormat pix_fmt;
1698 #if FF_API_MOTION_EST
1700 * This option does nothing
1701 * @deprecated use codec private options instead
1703 attribute_deprecated int me_method;
1707 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1708 * decoder to draw a horizontal band. It improves cache usage. Not
1709 * all codecs can do that. You must check the codec capabilities
1711 * When multithreading is used, it may be called from multiple threads
1712 * at the same time; threads might draw different parts of the same AVFrame,
1713 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1715 * The function is also used by hardware acceleration APIs.
1716 * It is called at least once during frame decoding to pass
1717 * the data needed for hardware render.
1718 * In that mode instead of pixel data, AVFrame points to
1719 * a structure specific to the acceleration API. The application
1720 * reads the structure and can change some fields to indicate progress
1722 * - encoding: unused
1723 * - decoding: Set by user.
1724 * @param height the height of the slice
1725 * @param y the y position of the slice
1726 * @param type 1->top field, 2->bottom field, 3->frame
1727 * @param offset offset into the AVFrame.data from which the slice should be read
1729 void (*draw_horiz_band)(struct AVCodecContext *s,
1730 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1731 int y, int type, int height);
1734 * callback to negotiate the pixelFormat
1735 * @param fmt is the list of formats which are supported by the codec,
1736 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1737 * The first is always the native one.
1738 * @note The callback may be called again immediately if initialization for
1739 * the selected (hardware-accelerated) pixel format failed.
1740 * @warning Behavior is undefined if the callback returns a value not
1741 * in the fmt list of formats.
1742 * @return the chosen format
1743 * - encoding: unused
1744 * - decoding: Set by user, if not set the native format will be chosen.
1746 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1749 * maximum number of B-frames between non-B-frames
1750 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1751 * - encoding: Set by user.
1752 * - decoding: unused
1757 * qscale factor between IP and B-frames
1758 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1759 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1760 * - encoding: Set by user.
1761 * - decoding: unused
1763 float b_quant_factor;
1765 #if FF_API_RC_STRATEGY
1766 /** @deprecated use codec private option instead */
1767 attribute_deprecated int rc_strategy;
1768 #define FF_RC_STRATEGY_XVID 1
1771 int b_frame_strategy;
1774 * qscale offset between IP and B-frames
1775 * - encoding: Set by user.
1776 * - decoding: unused
1778 float b_quant_offset;
1781 * Size of the frame reordering buffer in the decoder.
1782 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1783 * - encoding: Set by libavcodec.
1784 * - decoding: Set by libavcodec.
1789 * 0-> h263 quant 1-> mpeg quant
1790 * - encoding: Set by user.
1791 * - decoding: unused
1796 * qscale factor between P and I-frames
1797 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1798 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1799 * - encoding: Set by user.
1800 * - decoding: unused
1802 float i_quant_factor;
1805 * qscale offset between P and I-frames
1806 * - encoding: Set by user.
1807 * - decoding: unused
1809 float i_quant_offset;
1812 * luminance masking (0-> disabled)
1813 * - encoding: Set by user.
1814 * - decoding: unused
1819 * temporary complexity masking (0-> disabled)
1820 * - encoding: Set by user.
1821 * - decoding: unused
1823 float temporal_cplx_masking;
1826 * spatial complexity masking (0-> disabled)
1827 * - encoding: Set by user.
1828 * - decoding: unused
1830 float spatial_cplx_masking;
1833 * p block masking (0-> disabled)
1834 * - encoding: Set by user.
1835 * - decoding: unused
1840 * darkness masking (0-> disabled)
1841 * - encoding: Set by user.
1842 * - decoding: unused
1848 * - encoding: Set by libavcodec.
1849 * - decoding: Set by user (or 0).
1853 * prediction method (needed for huffyuv)
1854 * - encoding: Set by user.
1855 * - decoding: unused
1857 int prediction_method;
1858 #define FF_PRED_LEFT 0
1859 #define FF_PRED_PLANE 1
1860 #define FF_PRED_MEDIAN 2
1863 * slice offsets in the frame in bytes
1864 * - encoding: Set/allocated by libavcodec.
1865 * - decoding: Set/allocated by user (or NULL).
1870 * sample aspect ratio (0 if unknown)
1871 * That is the width of a pixel divided by the height of the pixel.
1872 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1873 * - encoding: Set by user.
1874 * - decoding: Set by libavcodec.
1876 AVRational sample_aspect_ratio;
1879 * motion estimation comparison function
1880 * - encoding: Set by user.
1881 * - decoding: unused
1885 * subpixel motion estimation comparison function
1886 * - encoding: Set by user.
1887 * - decoding: unused
1891 * macroblock comparison function (not supported yet)
1892 * - encoding: Set by user.
1893 * - decoding: unused
1897 * interlaced DCT comparison function
1898 * - encoding: Set by user.
1899 * - decoding: unused
1902 #define FF_CMP_SAD 0
1903 #define FF_CMP_SSE 1
1904 #define FF_CMP_SATD 2
1905 #define FF_CMP_DCT 3
1906 #define FF_CMP_PSNR 4
1907 #define FF_CMP_BIT 5
1909 #define FF_CMP_ZERO 7
1910 #define FF_CMP_VSAD 8
1911 #define FF_CMP_VSSE 9
1912 #define FF_CMP_NSSE 10
1913 #define FF_CMP_W53 11
1914 #define FF_CMP_W97 12
1915 #define FF_CMP_DCTMAX 13
1916 #define FF_CMP_DCT264 14
1917 #define FF_CMP_CHROMA 256
1920 * ME diamond size & shape
1921 * - encoding: Set by user.
1922 * - decoding: unused
1927 * amount of previous MV predictors (2a+1 x 2a+1 square)
1928 * - encoding: Set by user.
1929 * - decoding: unused
1931 int last_predictor_count;
1934 * prepass for motion estimation
1935 * - encoding: Set by user.
1936 * - decoding: unused
1941 * motion estimation prepass comparison function
1942 * - encoding: Set by user.
1943 * - decoding: unused
1948 * ME prepass diamond size & shape
1949 * - encoding: Set by user.
1950 * - decoding: unused
1956 * - encoding: Set by user.
1957 * - decoding: unused
1959 int me_subpel_quality;
1963 * DTG active format information (additional aspect ratio
1964 * information only used in DVB MPEG-2 transport streams)
1967 * - encoding: unused
1968 * - decoding: Set by decoder.
1969 * @deprecated Deprecated in favor of AVSideData
1971 attribute_deprecated int dtg_active_format;
1972 #define FF_DTG_AFD_SAME 8
1973 #define FF_DTG_AFD_4_3 9
1974 #define FF_DTG_AFD_16_9 10
1975 #define FF_DTG_AFD_14_9 11
1976 #define FF_DTG_AFD_4_3_SP_14_9 13
1977 #define FF_DTG_AFD_16_9_SP_14_9 14
1978 #define FF_DTG_AFD_SP_4_3 15
1979 #endif /* FF_API_AFD */
1982 * maximum motion estimation search range in subpel units
1983 * If 0 then no limit.
1985 * - encoding: Set by user.
1986 * - decoding: unused
1990 #if FF_API_QUANT_BIAS
1992 * @deprecated use encoder private option instead
1994 attribute_deprecated int intra_quant_bias;
1995 #define FF_DEFAULT_QUANT_BIAS 999999
1998 * @deprecated use encoder private option instead
2000 attribute_deprecated int inter_quant_bias;
2005 * - encoding: unused
2006 * - decoding: Set by user.
2009 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2010 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2011 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2015 * XVideo Motion Acceleration
2016 * - encoding: forbidden
2017 * - decoding: set by decoder
2018 * @deprecated XvMC doesn't need it anymore.
2020 attribute_deprecated int xvmc_acceleration;
2021 #endif /* FF_API_XVMC */
2024 * macroblock decision mode
2025 * - encoding: Set by user.
2026 * - decoding: unused
2029 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2030 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2031 #define FF_MB_DECISION_RD 2 ///< rate distortion
2034 * custom intra quantization matrix
2035 * - encoding: Set by user, can be NULL.
2036 * - decoding: Set by libavcodec.
2038 uint16_t *intra_matrix;
2041 * custom inter quantization matrix
2042 * - encoding: Set by user, can be NULL.
2043 * - decoding: Set by libavcodec.
2045 uint16_t *inter_matrix;
2048 * scene change detection threshold
2049 * 0 is default, larger means fewer detected scene changes.
2050 * - encoding: Set by user.
2051 * - decoding: unused
2053 int scenechange_threshold;
2056 * noise reduction strength
2057 * - encoding: Set by user.
2058 * - decoding: unused
2060 int noise_reduction;
2064 * @deprecated this field is unused
2066 attribute_deprecated
2070 * @deprecated this field is unused
2072 attribute_deprecated
2077 * precision of the intra DC coefficient - 8
2078 * - encoding: Set by user.
2079 * - decoding: Set by libavcodec
2081 int intra_dc_precision;
2084 * Number of macroblock rows at the top which are skipped.
2085 * - encoding: unused
2086 * - decoding: Set by user.
2091 * Number of macroblock rows at the bottom which are skipped.
2092 * - encoding: unused
2093 * - decoding: Set by user.
2099 * @deprecated use encoder private options instead
2101 attribute_deprecated
2102 float border_masking;
2106 * minimum MB lagrange multipler
2107 * - encoding: Set by user.
2108 * - decoding: unused
2113 * maximum MB lagrange multipler
2114 * - encoding: Set by user.
2115 * - decoding: unused
2121 * - encoding: Set by user.
2122 * - decoding: unused
2124 int me_penalty_compensation;
2128 * - encoding: Set by user.
2129 * - decoding: unused
2135 * - encoding: Set by user.
2136 * - decoding: unused
2142 * - encoding: Set by user.
2143 * - decoding: unused
2148 * number of reference frames
2149 * - encoding: Set by user.
2150 * - decoding: Set by lavc.
2155 * chroma qp offset from luma
2156 * - encoding: Set by user.
2157 * - decoding: unused
2161 #if FF_API_UNUSED_MEMBERS
2163 * Multiplied by qscale for each frame and added to scene_change_score.
2164 * - encoding: Set by user.
2165 * - decoding: unused
2167 attribute_deprecated int scenechange_factor;
2172 * Note: Value depends upon the compare function used for fullpel ME.
2173 * - encoding: Set by user.
2174 * - decoding: unused
2179 * Adjust sensitivity of b_frame_strategy 1.
2180 * - encoding: Set by user.
2181 * - decoding: unused
2186 * Chromaticity coordinates of the source primaries.
2187 * - encoding: Set by user
2188 * - decoding: Set by libavcodec
2190 enum AVColorPrimaries color_primaries;
2193 * Color Transfer Characteristic.
2194 * - encoding: Set by user
2195 * - decoding: Set by libavcodec
2197 enum AVColorTransferCharacteristic color_trc;
2200 * YUV colorspace type.
2201 * - encoding: Set by user
2202 * - decoding: Set by libavcodec
2204 enum AVColorSpace colorspace;
2207 * MPEG vs JPEG YUV range.
2208 * - encoding: Set by user
2209 * - decoding: Set by libavcodec
2211 enum AVColorRange color_range;
2214 * This defines the location of chroma samples.
2215 * - encoding: Set by user
2216 * - decoding: Set by libavcodec
2218 enum AVChromaLocation chroma_sample_location;
2222 * Indicates number of picture subdivisions. Used for parallelized
2224 * - encoding: Set by user
2225 * - decoding: unused
2230 * - encoding: set by libavcodec
2231 * - decoding: Set by user.
2233 enum AVFieldOrder field_order;
2236 int sample_rate; ///< samples per second
2237 int channels; ///< number of audio channels
2240 * audio sample format
2241 * - encoding: Set by user.
2242 * - decoding: Set by libavcodec.
2244 enum AVSampleFormat sample_fmt; ///< sample format
2246 /* The following data should not be initialized. */
2248 * Number of samples per channel in an audio frame.
2250 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2251 * except the last must contain exactly frame_size samples per channel.
2252 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2253 * frame size is not restricted.
2254 * - decoding: may be set by some decoders to indicate constant frame size
2259 * Frame counter, set by libavcodec.
2261 * - decoding: total number of frames returned from the decoder so far.
2262 * - encoding: total number of frames passed to the encoder so far.
2264 * @note the counter is not incremented if encoding/decoding resulted in
2270 * number of bytes per packet if constant and known or 0
2271 * Used by some WAV based audio codecs.
2276 * Audio cutoff bandwidth (0 means "automatic")
2277 * - encoding: Set by user.
2278 * - decoding: unused
2283 * Audio channel layout.
2284 * - encoding: set by user.
2285 * - decoding: set by user, may be overwritten by libavcodec.
2287 uint64_t channel_layout;
2290 * Request decoder to use this channel layout if it can (0 for default)
2291 * - encoding: unused
2292 * - decoding: Set by user.
2294 uint64_t request_channel_layout;
2297 * Type of service that the audio stream conveys.
2298 * - encoding: Set by user.
2299 * - decoding: Set by libavcodec.
2301 enum AVAudioServiceType audio_service_type;
2304 * desired sample format
2305 * - encoding: Not used.
2306 * - decoding: Set by user.
2307 * Decoder will decode to this format if it can.
2309 enum AVSampleFormat request_sample_fmt;
2312 * This callback is called at the beginning of each frame to get data
2313 * buffer(s) for it. There may be one contiguous buffer for all the data or
2314 * there may be a buffer per each data plane or anything in between. What
2315 * this means is, you may set however many entries in buf[] you feel necessary.
2316 * Each buffer must be reference-counted using the AVBuffer API (see description
2319 * The following fields will be set in the frame before this callback is
2322 * - width, height (video only)
2323 * - sample_rate, channel_layout, nb_samples (audio only)
2324 * Their values may differ from the corresponding values in
2325 * AVCodecContext. This callback must use the frame values, not the codec
2326 * context values, to calculate the required buffer size.
2328 * This callback must fill the following fields in the frame:
2332 * * if the data is planar audio with more than 8 channels, then this
2333 * callback must allocate and fill extended_data to contain all pointers
2334 * to all data planes. data[] must hold as many pointers as it can.
2335 * extended_data must be allocated with av_malloc() and will be freed in
2337 * * otherwise exended_data must point to data
2338 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2339 * the frame's data and extended_data pointers must be contained in these. That
2340 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2341 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2342 * and av_buffer_ref().
2343 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2344 * this callback and filled with the extra buffers if there are more
2345 * buffers than buf[] can hold. extended_buf will be freed in
2348 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2349 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2352 * Each data plane must be aligned to the maximum required by the target
2355 * @see avcodec_default_get_buffer2()
2359 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2360 * (read and/or written to if it is writable) later by libavcodec.
2362 * avcodec_align_dimensions2() should be used to find the required width and
2363 * height, as they normally need to be rounded up to the next multiple of 16.
2365 * Some decoders do not support linesizes changing between frames.
2367 * If frame multithreading is used and thread_safe_callbacks is set,
2368 * this callback may be called from a different thread, but not from more
2369 * than one at once. Does not need to be reentrant.
2371 * @see avcodec_align_dimensions2()
2375 * Decoders request a buffer of a particular size by setting
2376 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2377 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2378 * to a smaller value in the output frame.
2380 * As a convenience, av_samples_get_buffer_size() and
2381 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2382 * functions to find the required data size and to fill data pointers and
2383 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2384 * since all planes must be the same size.
2386 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2388 * - encoding: unused
2389 * - decoding: Set by libavcodec, user can override.
2391 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2394 * If non-zero, the decoded audio and video frames returned from
2395 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2396 * and are valid indefinitely. The caller must free them with
2397 * av_frame_unref() when they are not needed anymore.
2398 * Otherwise, the decoded frames must not be freed by the caller and are
2399 * only valid until the next decode call.
2401 * - encoding: unused
2402 * - decoding: set by the caller before avcodec_open2().
2404 int refcounted_frames;
2406 /* - encoding parameters */
2407 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2408 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2412 * - encoding: Set by user.
2413 * - decoding: unused
2419 * - encoding: Set by user.
2420 * - decoding: unused
2425 * maximum quantizer difference between frames
2426 * - encoding: Set by user.
2427 * - decoding: unused
2433 * @deprecated use encoder private options instead
2435 attribute_deprecated
2438 attribute_deprecated
2440 attribute_deprecated
2445 * decoder bitstream buffer size
2446 * - encoding: Set by user.
2447 * - decoding: unused
2452 * ratecontrol override, see RcOverride
2453 * - encoding: Allocated/set/freed by user.
2454 * - decoding: unused
2456 int rc_override_count;
2457 RcOverride *rc_override;
2461 * @deprecated use encoder private options instead
2463 attribute_deprecated
2469 * - encoding: Set by user.
2470 * - decoding: Set by user, may be overwritten by libavcodec.
2472 int64_t rc_max_rate;
2476 * - encoding: Set by user.
2477 * - decoding: unused
2479 int64_t rc_min_rate;
2483 * @deprecated use encoder private options instead
2485 attribute_deprecated
2486 float rc_buffer_aggressivity;
2488 attribute_deprecated
2489 float rc_initial_cplx;
2493 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2494 * - encoding: Set by user.
2495 * - decoding: unused.
2497 float rc_max_available_vbv_use;
2500 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2501 * - encoding: Set by user.
2502 * - decoding: unused.
2504 float rc_min_vbv_overflow_use;
2507 * Number of bits which should be loaded into the rc buffer before decoding starts.
2508 * - encoding: Set by user.
2509 * - decoding: unused
2511 int rc_initial_buffer_occupancy;
2513 #define FF_CODER_TYPE_VLC 0
2514 #define FF_CODER_TYPE_AC 1
2515 #define FF_CODER_TYPE_RAW 2
2516 #define FF_CODER_TYPE_RLE 3
2517 #if FF_API_UNUSED_MEMBERS
2518 #define FF_CODER_TYPE_DEFLATE 4
2519 #endif /* FF_API_UNUSED_MEMBERS */
2522 * - encoding: Set by user.
2523 * - decoding: unused
2529 * - encoding: Set by user.
2530 * - decoding: unused
2536 * @deprecated use encoder private options instead
2538 attribute_deprecated
2542 * @deprecated use encoder private options instead
2544 attribute_deprecated
2549 * frame skip threshold
2550 * - encoding: Set by user.
2551 * - decoding: unused
2553 int frame_skip_threshold;
2557 * - encoding: Set by user.
2558 * - decoding: unused
2560 int frame_skip_factor;
2563 * frame skip exponent
2564 * - encoding: Set by user.
2565 * - decoding: unused
2570 * frame skip comparison function
2571 * - encoding: Set by user.
2572 * - decoding: unused
2577 * trellis RD quantization
2578 * - encoding: Set by user.
2579 * - decoding: unused
2584 * - encoding: Set by user.
2585 * - decoding: unused
2587 int min_prediction_order;
2590 * - encoding: Set by user.
2591 * - decoding: unused
2593 int max_prediction_order;
2596 * GOP timecode frame start number
2597 * - encoding: Set by user, in non drop frame format
2598 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2600 int64_t timecode_frame_start;
2602 /* The RTP callback: This function is called */
2603 /* every time the encoder has a packet to send. */
2604 /* It depends on the encoder if the data starts */
2605 /* with a Start Code (it should). H.263 does. */
2606 /* mb_nb contains the number of macroblocks */
2607 /* encoded in the RTP payload. */
2608 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2610 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2611 /* do its best to deliver a chunk with size */
2612 /* below rtp_payload_size, the chunk will start */
2613 /* with a start code on some codecs like H.263. */
2614 /* This doesn't take account of any particular */
2615 /* headers inside the transmitted RTP payload. */
2617 /* statistics, used for 2-pass encoding */
2628 * number of bits used for the previously encoded frame
2629 * - encoding: Set by libavcodec.
2630 * - decoding: unused
2635 * pass1 encoding statistics output buffer
2636 * - encoding: Set by libavcodec.
2637 * - decoding: unused
2642 * pass2 encoding statistics input buffer
2643 * Concatenated stuff from stats_out of pass1 should be placed here.
2644 * - encoding: Allocated/set/freed by user.
2645 * - decoding: unused
2650 * Work around bugs in encoders which sometimes cannot be detected automatically.
2651 * - encoding: Set by user
2652 * - decoding: Set by user
2654 int workaround_bugs;
2655 #define FF_BUG_AUTODETECT 1 ///< autodetection
2656 #if FF_API_OLD_MSMPEG4
2657 #define FF_BUG_OLD_MSMPEG4 2
2659 #define FF_BUG_XVID_ILACE 4
2660 #define FF_BUG_UMP4 8
2661 #define FF_BUG_NO_PADDING 16
2662 #define FF_BUG_AMV 32
2664 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2666 #define FF_BUG_QPEL_CHROMA 64
2667 #define FF_BUG_STD_QPEL 128
2668 #define FF_BUG_QPEL_CHROMA2 256
2669 #define FF_BUG_DIRECT_BLOCKSIZE 512
2670 #define FF_BUG_EDGE 1024
2671 #define FF_BUG_HPEL_CHROMA 2048
2672 #define FF_BUG_DC_CLIP 4096
2673 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2674 #define FF_BUG_TRUNCATED 16384
2677 * strictly follow the standard (MPEG4, ...).
2678 * - encoding: Set by user.
2679 * - decoding: Set by user.
2680 * Setting this to STRICT or higher means the encoder and decoder will
2681 * generally do stupid things, whereas setting it to unofficial or lower
2682 * will mean the encoder might produce output that is not supported by all
2683 * spec-compliant decoders. Decoders don't differentiate between normal,
2684 * unofficial and experimental (that is, they always try to decode things
2685 * when they can) unless they are explicitly asked to behave stupidly
2686 * (=strictly conform to the specs)
2688 int strict_std_compliance;
2689 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2690 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2691 #define FF_COMPLIANCE_NORMAL 0
2692 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2693 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2696 * error concealment flags
2697 * - encoding: unused
2698 * - decoding: Set by user.
2700 int error_concealment;
2701 #define FF_EC_GUESS_MVS 1
2702 #define FF_EC_DEBLOCK 2
2703 #define FF_EC_FAVOR_INTER 256
2707 * - encoding: Set by user.
2708 * - decoding: Set by user.
2711 #define FF_DEBUG_PICT_INFO 1
2712 #define FF_DEBUG_RC 2
2713 #define FF_DEBUG_BITSTREAM 4
2714 #define FF_DEBUG_MB_TYPE 8
2715 #define FF_DEBUG_QP 16
2718 * @deprecated this option does nothing
2720 #define FF_DEBUG_MV 32
2722 #define FF_DEBUG_DCT_COEFF 0x00000040
2723 #define FF_DEBUG_SKIP 0x00000080
2724 #define FF_DEBUG_STARTCODE 0x00000100
2725 #if FF_API_UNUSED_MEMBERS
2726 #define FF_DEBUG_PTS 0x00000200
2727 #endif /* FF_API_UNUSED_MEMBERS */
2728 #define FF_DEBUG_ER 0x00000400
2729 #define FF_DEBUG_MMCO 0x00000800
2730 #define FF_DEBUG_BUGS 0x00001000
2732 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2733 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2735 #define FF_DEBUG_BUFFERS 0x00008000
2736 #define FF_DEBUG_THREADS 0x00010000
2737 #define FF_DEBUG_GREEN_MD 0x00800000
2738 #define FF_DEBUG_NOMC 0x01000000
2743 * Code outside libavcodec should access this field using AVOptions
2744 * - encoding: Set by user.
2745 * - decoding: Set by user.
2748 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2749 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2750 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2754 * Error recognition; may misdetect some more or less valid parts as errors.
2755 * - encoding: unused
2756 * - decoding: Set by user.
2758 int err_recognition;
2761 * Verify checksums embedded in the bitstream (could be of either encoded or
2762 * decoded data, depending on the codec) and print an error message on mismatch.
2763 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2764 * decoder returning an error.
2766 #define AV_EF_CRCCHECK (1<<0)
2767 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2768 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2769 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2771 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2772 #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
2773 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2774 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2778 * opaque 64bit number (generally a PTS) that will be reordered and
2779 * output in AVFrame.reordered_opaque
2780 * - encoding: unused
2781 * - decoding: Set by user.
2783 int64_t reordered_opaque;
2786 * Hardware accelerator in use
2787 * - encoding: unused.
2788 * - decoding: Set by libavcodec
2790 struct AVHWAccel *hwaccel;
2793 * Hardware accelerator context.
2794 * For some hardware accelerators, a global context needs to be
2795 * provided by the user. In that case, this holds display-dependent
2796 * data FFmpeg cannot instantiate itself. Please refer to the
2797 * FFmpeg HW accelerator documentation to know how to fill this
2798 * is. e.g. for VA API, this is a struct vaapi_context.
2799 * - encoding: unused
2800 * - decoding: Set by user
2802 void *hwaccel_context;
2806 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2807 * - decoding: unused
2809 uint64_t error[AV_NUM_DATA_POINTERS];
2812 * DCT algorithm, see FF_DCT_* below
2813 * - encoding: Set by user.
2814 * - decoding: unused
2817 #define FF_DCT_AUTO 0
2818 #define FF_DCT_FASTINT 1
2819 #define FF_DCT_INT 2
2820 #define FF_DCT_MMX 3
2821 #define FF_DCT_ALTIVEC 5
2822 #define FF_DCT_FAAN 6
2825 * IDCT algorithm, see FF_IDCT_* below.
2826 * - encoding: Set by user.
2827 * - decoding: Set by user.
2830 #define FF_IDCT_AUTO 0
2831 #define FF_IDCT_INT 1
2832 #define FF_IDCT_SIMPLE 2
2833 #define FF_IDCT_SIMPLEMMX 3
2834 #define FF_IDCT_ARM 7
2835 #define FF_IDCT_ALTIVEC 8
2837 #define FF_IDCT_SH4 9
2839 #define FF_IDCT_SIMPLEARM 10
2840 #if FF_API_UNUSED_MEMBERS
2841 #define FF_IDCT_IPP 13
2842 #endif /* FF_API_UNUSED_MEMBERS */
2843 #define FF_IDCT_XVID 14
2844 #if FF_API_IDCT_XVIDMMX
2845 #define FF_IDCT_XVIDMMX 14
2846 #endif /* FF_API_IDCT_XVIDMMX */
2847 #define FF_IDCT_SIMPLEARMV5TE 16
2848 #define FF_IDCT_SIMPLEARMV6 17
2849 #if FF_API_ARCH_SPARC
2850 #define FF_IDCT_SIMPLEVIS 18
2852 #define FF_IDCT_FAAN 20
2853 #define FF_IDCT_SIMPLENEON 22
2854 #if FF_API_ARCH_ALPHA
2855 #define FF_IDCT_SIMPLEALPHA 23
2857 #define FF_IDCT_SIMPLEAUTO 128
2860 * bits per sample/pixel from the demuxer (needed for huffyuv).
2861 * - encoding: Set by libavcodec.
2862 * - decoding: Set by user.
2864 int bits_per_coded_sample;
2867 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2868 * - encoding: set by user.
2869 * - decoding: set by libavcodec.
2871 int bits_per_raw_sample;
2875 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2876 * - encoding: unused
2877 * - decoding: Set by user.
2878 * Code outside libavcodec should access this field using:
2879 * av_codec_{get,set}_lowres(avctx)
2884 #if FF_API_CODED_FRAME
2886 * the picture in the bitstream
2887 * - encoding: Set by libavcodec.
2888 * - decoding: unused
2890 * @deprecated use the quality factor packet side data instead
2892 attribute_deprecated AVFrame *coded_frame;
2897 * is used to decide how many independent tasks should be passed to execute()
2898 * - encoding: Set by user.
2899 * - decoding: Set by user.
2904 * Which multithreading methods to use.
2905 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2906 * so clients which cannot provide future frames should not use it.
2908 * - encoding: Set by user, otherwise the default is used.
2909 * - decoding: Set by user, otherwise the default is used.
2912 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2913 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2916 * Which multithreading methods are in use by the codec.
2917 * - encoding: Set by libavcodec.
2918 * - decoding: Set by libavcodec.
2920 int active_thread_type;
2923 * Set by the client if its custom get_buffer() callback can be called
2924 * synchronously from another thread, which allows faster multithreaded decoding.
2925 * draw_horiz_band() will be called from other threads regardless of this setting.
2926 * Ignored if the default get_buffer() is used.
2927 * - encoding: Set by user.
2928 * - decoding: Set by user.
2930 int thread_safe_callbacks;
2933 * The codec may call this to execute several independent things.
2934 * It will return only after finishing all tasks.
2935 * The user may replace this with some multithreaded implementation,
2936 * the default implementation will execute the parts serially.
2937 * @param count the number of things to execute
2938 * - encoding: Set by libavcodec, user can override.
2939 * - decoding: Set by libavcodec, user can override.
2941 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2944 * The codec may call this to execute several independent things.
2945 * It will return only after finishing all tasks.
2946 * The user may replace this with some multithreaded implementation,
2947 * the default implementation will execute the parts serially.
2948 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2949 * @param c context passed also to func
2950 * @param count the number of things to execute
2951 * @param arg2 argument passed unchanged to func
2952 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2953 * @param func function that will be called count times, with jobnr from 0 to count-1.
2954 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2955 * two instances of func executing at the same time will have the same threadnr.
2956 * @return always 0 currently, but code should handle a future improvement where when any call to func
2957 * returns < 0 no further calls to func may be done and < 0 is returned.
2958 * - encoding: Set by libavcodec, user can override.
2959 * - decoding: Set by libavcodec, user can override.
2961 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2964 * noise vs. sse weight for the nsse comparison function
2965 * - encoding: Set by user.
2966 * - decoding: unused
2972 * - encoding: Set by user.
2973 * - decoding: Set by libavcodec.
2976 #define FF_PROFILE_UNKNOWN -99
2977 #define FF_PROFILE_RESERVED -100
2979 #define FF_PROFILE_AAC_MAIN 0
2980 #define FF_PROFILE_AAC_LOW 1
2981 #define FF_PROFILE_AAC_SSR 2
2982 #define FF_PROFILE_AAC_LTP 3
2983 #define FF_PROFILE_AAC_HE 4
2984 #define FF_PROFILE_AAC_HE_V2 28
2985 #define FF_PROFILE_AAC_LD 22
2986 #define FF_PROFILE_AAC_ELD 38
2987 #define FF_PROFILE_MPEG2_AAC_LOW 128
2988 #define FF_PROFILE_MPEG2_AAC_HE 131
2990 #define FF_PROFILE_DTS 20
2991 #define FF_PROFILE_DTS_ES 30
2992 #define FF_PROFILE_DTS_96_24 40
2993 #define FF_PROFILE_DTS_HD_HRA 50
2994 #define FF_PROFILE_DTS_HD_MA 60
2995 #define FF_PROFILE_DTS_EXPRESS 70
2997 #define FF_PROFILE_MPEG2_422 0
2998 #define FF_PROFILE_MPEG2_HIGH 1
2999 #define FF_PROFILE_MPEG2_SS 2
3000 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3001 #define FF_PROFILE_MPEG2_MAIN 4
3002 #define FF_PROFILE_MPEG2_SIMPLE 5
3004 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3005 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3007 #define FF_PROFILE_H264_BASELINE 66
3008 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3009 #define FF_PROFILE_H264_MAIN 77
3010 #define FF_PROFILE_H264_EXTENDED 88
3011 #define FF_PROFILE_H264_HIGH 100
3012 #define FF_PROFILE_H264_HIGH_10 110
3013 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3014 #define FF_PROFILE_H264_HIGH_422 122
3015 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3016 #define FF_PROFILE_H264_HIGH_444 144
3017 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3018 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3019 #define FF_PROFILE_H264_CAVLC_444 44
3021 #define FF_PROFILE_VC1_SIMPLE 0
3022 #define FF_PROFILE_VC1_MAIN 1
3023 #define FF_PROFILE_VC1_COMPLEX 2
3024 #define FF_PROFILE_VC1_ADVANCED 3
3026 #define FF_PROFILE_MPEG4_SIMPLE 0
3027 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3028 #define FF_PROFILE_MPEG4_CORE 2
3029 #define FF_PROFILE_MPEG4_MAIN 3
3030 #define FF_PROFILE_MPEG4_N_BIT 4
3031 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3032 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3033 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3034 #define FF_PROFILE_MPEG4_HYBRID 8
3035 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3036 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3037 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3038 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3039 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3040 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3041 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3043 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3044 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3045 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3046 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3047 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3049 #define FF_PROFILE_VP9_0 0
3050 #define FF_PROFILE_VP9_1 1
3051 #define FF_PROFILE_VP9_2 2
3052 #define FF_PROFILE_VP9_3 3
3054 #define FF_PROFILE_HEVC_MAIN 1
3055 #define FF_PROFILE_HEVC_MAIN_10 2
3056 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3057 #define FF_PROFILE_HEVC_REXT 4
3061 * - encoding: Set by user.
3062 * - decoding: Set by libavcodec.
3065 #define FF_LEVEL_UNKNOWN -99
3068 * Skip loop filtering for selected frames.
3069 * - encoding: unused
3070 * - decoding: Set by user.
3072 enum AVDiscard skip_loop_filter;
3075 * Skip IDCT/dequantization for selected frames.
3076 * - encoding: unused
3077 * - decoding: Set by user.
3079 enum AVDiscard skip_idct;
3082 * Skip decoding for selected frames.
3083 * - encoding: unused
3084 * - decoding: Set by user.
3086 enum AVDiscard skip_frame;
3089 * Header containing style information for text subtitles.
3090 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3091 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3092 * the Format line following. It shouldn't include any Dialogue line.
3093 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3094 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3096 uint8_t *subtitle_header;
3097 int subtitle_header_size;
3099 #if FF_API_ERROR_RATE
3101 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3104 attribute_deprecated
3109 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3110 * Used for compliant TS muxing.
3111 * - encoding: Set by libavcodec.
3112 * - decoding: unused.
3116 #if FF_API_SIDEDATA_ONLY_PKT
3118 * Encoding only and set by default. Allow encoders to output packets
3119 * that do not contain any encoded data, only side data.
3121 * Some encoders need to output such packets, e.g. to update some stream
3122 * parameters at the end of encoding.
3124 * @deprecated this field disables the default behaviour and
3125 * it is kept only for compatibility.
3127 attribute_deprecated
3128 int side_data_only_packets;
3132 * Audio only. The number of "priming" samples (padding) inserted by the
3133 * encoder at the beginning of the audio. I.e. this number of leading
3134 * decoded samples must be discarded by the caller to get the original audio
3135 * without leading padding.
3137 * - decoding: unused
3138 * - encoding: Set by libavcodec. The timestamps on the output packets are
3139 * adjusted by the encoder so that they always refer to the
3140 * first sample of the data actually contained in the packet,
3141 * including any added padding. E.g. if the timebase is
3142 * 1/samplerate and the timestamp of the first input sample is
3143 * 0, the timestamp of the first output packet will be
3146 int initial_padding;
3149 * - decoding: For codecs that store a framerate value in the compressed
3150 * bitstream, the decoder may export it here. { 0, 1} when
3152 * - encoding: unused
3154 AVRational framerate;
3157 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3158 * - encoding: unused.
3159 * - decoding: Set by libavcodec before calling get_format()
3161 enum AVPixelFormat sw_pix_fmt;
3164 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3165 * Code outside libavcodec should access this field using:
3166 * av_codec_{get,set}_pkt_timebase(avctx)
3167 * - encoding unused.
3168 * - decoding set by user.
3170 AVRational pkt_timebase;
3174 * Code outside libavcodec should access this field using:
3175 * av_codec_{get,set}_codec_descriptor(avctx)
3176 * - encoding: unused.
3177 * - decoding: set by libavcodec.
3179 const AVCodecDescriptor *codec_descriptor;
3183 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3184 * - encoding: unused
3185 * - decoding: Set by user.
3186 * Code outside libavcodec should access this field using:
3187 * av_codec_{get,set}_lowres(avctx)
3193 * Current statistics for PTS correction.
3194 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3195 * - encoding: unused
3197 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3198 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3199 int64_t pts_correction_last_pts; /// PTS of the last frame
3200 int64_t pts_correction_last_dts; /// DTS of the last frame
3203 * Character encoding of the input subtitles file.
3204 * - decoding: set by user
3205 * - encoding: unused
3210 * Subtitles character encoding mode. Formats or codecs might be adjusting
3211 * this setting (if they are doing the conversion themselves for instance).
3212 * - decoding: set by libavcodec
3213 * - encoding: unused
3215 int sub_charenc_mode;
3216 #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)
3217 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3218 #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
3221 * Skip processing alpha if supported by codec.
3222 * Note that if the format uses pre-multiplied alpha (common with VP6,
3223 * and recommended due to better video quality/compression)
3224 * the image will look as if alpha-blended onto a black background.
3225 * However for formats that do not use pre-multiplied alpha
3226 * there might be serious artefacts (though e.g. libswscale currently
3227 * assumes pre-multiplied alpha anyway).
3228 * Code outside libavcodec should access this field using AVOptions
3230 * - decoding: set by user
3231 * - encoding: unused
3236 * Number of samples to skip after a discontinuity
3237 * - decoding: unused
3238 * - encoding: set by libavcodec
3242 #if !FF_API_DEBUG_MV
3244 * debug motion vectors
3245 * Code outside libavcodec should access this field using AVOptions
3246 * - encoding: Set by user.
3247 * - decoding: Set by user.
3250 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3251 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3252 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3256 * custom intra quantization matrix
3257 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3258 * - encoding: Set by user, can be NULL.
3259 * - decoding: unused.
3261 uint16_t *chroma_intra_matrix;
3264 * dump format separator.
3265 * can be ", " or "\n " or anything else
3266 * Code outside libavcodec should access this field using AVOptions
3267 * (NO direct access).
3268 * - encoding: Set by user.
3269 * - decoding: Set by user.
3271 uint8_t *dump_separator;
3274 * ',' separated list of allowed decoders.
3275 * If NULL then all are allowed
3276 * - encoding: unused
3277 * - decoding: set by user through AVOPtions (NO direct access)
3279 char *codec_whitelist;
3282 * Properties of the stream that gets decoded
3283 * To be accessed through av_codec_get_properties() (NO direct access)
3284 * - encoding: unused
3285 * - decoding: set by libavcodec
3287 unsigned properties;
3288 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3289 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3292 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3293 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3295 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3296 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3298 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3300 int av_codec_get_lowres(const AVCodecContext *avctx);
3301 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3303 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3304 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3306 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3307 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3312 typedef struct AVProfile {
3314 const char *name; ///< short name for the profile
3317 typedef struct AVCodecDefault AVCodecDefault;
3324 typedef struct AVCodec {
3326 * Name of the codec implementation.
3327 * The name is globally unique among encoders and among decoders (but an
3328 * encoder and a decoder can share the same name).
3329 * This is the primary way to find a codec from the user perspective.
3333 * Descriptive name for the codec, meant to be more human readable than name.
3334 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3336 const char *long_name;
3337 enum AVMediaType type;
3340 * Codec capabilities.
3341 * see AV_CODEC_CAP_*
3344 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3345 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3346 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3347 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3348 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3349 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3350 const AVClass *priv_class; ///< AVClass for the private context
3351 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3353 /*****************************************************************
3354 * No fields below this line are part of the public API. They
3355 * may not be used outside of libavcodec and can be changed and
3357 * New public fields should be added right above.
3358 *****************************************************************
3361 struct AVCodec *next;
3363 * @name Frame-level threading support functions
3367 * If defined, called on thread contexts when they are created.
3368 * If the codec allocates writable tables in init(), re-allocate them here.
3369 * priv_data will be set to a copy of the original.
3371 int (*init_thread_copy)(AVCodecContext *);
3373 * Copy necessary context variables from a previous thread context to the current one.
3374 * If not defined, the next thread will start automatically; otherwise, the codec
3375 * must call ff_thread_finish_setup().
3377 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3379 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3383 * Private codec-specific defaults.
3385 const AVCodecDefault *defaults;
3388 * Initialize codec static data, called from avcodec_register().
3390 void (*init_static_data)(struct AVCodec *codec);
3392 int (*init)(AVCodecContext *);
3393 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3394 const struct AVSubtitle *sub);
3396 * Encode data to an AVPacket.
3398 * @param avctx codec context
3399 * @param avpkt output AVPacket (may contain a user-provided buffer)
3400 * @param[in] frame AVFrame containing the raw data to be encoded
3401 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3402 * non-empty packet was returned in avpkt.
3403 * @return 0 on success, negative error code on failure
3405 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3406 int *got_packet_ptr);
3407 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3408 int (*close)(AVCodecContext *);
3411 * Will be called when seeking
3413 void (*flush)(AVCodecContext *);
3415 * Internal codec capabilities.
3416 * See FF_CODEC_CAP_* in internal.h
3421 int av_codec_get_max_lowres(const AVCodec *codec);
3423 struct MpegEncContext;
3426 * @defgroup lavc_hwaccel AVHWAccel
3429 typedef struct AVHWAccel {
3431 * Name of the hardware accelerated codec.
3432 * The name is globally unique among encoders and among decoders (but an
3433 * encoder and a decoder can share the same name).
3438 * Type of codec implemented by the hardware accelerator.
3440 * See AVMEDIA_TYPE_xxx
3442 enum AVMediaType type;
3445 * Codec implemented by the hardware accelerator.
3447 * See AV_CODEC_ID_xxx
3452 * Supported pixel format.
3454 * Only hardware accelerated formats are supported here.
3456 enum AVPixelFormat pix_fmt;
3459 * Hardware accelerated codec capabilities.
3460 * see HWACCEL_CODEC_CAP_*
3464 /*****************************************************************
3465 * No fields below this line are part of the public API. They
3466 * may not be used outside of libavcodec and can be changed and
3468 * New public fields should be added right above.
3469 *****************************************************************
3471 struct AVHWAccel *next;
3474 * Allocate a custom buffer
3476 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3479 * Called at the beginning of each frame or field picture.
3481 * Meaningful frame information (codec specific) is guaranteed to
3482 * be parsed at this point. This function is mandatory.
3484 * Note that buf can be NULL along with buf_size set to 0.
3485 * Otherwise, this means the whole frame is available at this point.
3487 * @param avctx the codec context
3488 * @param buf the frame data buffer base
3489 * @param buf_size the size of the frame in bytes
3490 * @return zero if successful, a negative value otherwise
3492 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3495 * Callback for each slice.
3497 * Meaningful slice information (codec specific) is guaranteed to
3498 * be parsed at this point. This function is mandatory.
3499 * The only exception is XvMC, that works on MB level.
3501 * @param avctx the codec context
3502 * @param buf the slice data buffer base
3503 * @param buf_size the size of the slice in bytes
3504 * @return zero if successful, a negative value otherwise
3506 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3509 * Called at the end of each frame or field picture.
3511 * The whole picture is parsed at this point and can now be sent
3512 * to the hardware accelerator. This function is mandatory.
3514 * @param avctx the codec context
3515 * @return zero if successful, a negative value otherwise
3517 int (*end_frame)(AVCodecContext *avctx);
3520 * Size of per-frame hardware accelerator private data.
3522 * Private data is allocated with av_mallocz() before
3523 * AVCodecContext.get_buffer() and deallocated after
3524 * AVCodecContext.release_buffer().
3526 int frame_priv_data_size;
3529 * Called for every Macroblock in a slice.
3531 * XvMC uses it to replace the ff_mpv_decode_mb().
3532 * Instead of decoding to raw picture, MB parameters are
3533 * stored in an array provided by the video driver.
3535 * @param s the mpeg context
3537 void (*decode_mb)(struct MpegEncContext *s);
3540 * Initialize the hwaccel private data.
3542 * This will be called from ff_get_format(), after hwaccel and
3543 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3546 int (*init)(AVCodecContext *avctx);
3549 * Uninitialize the hwaccel private data.
3551 * This will be called from get_format() or avcodec_close(), after hwaccel
3552 * and hwaccel_context are already uninitialized.
3554 int (*uninit)(AVCodecContext *avctx);
3557 * Size of the private data to allocate in
3558 * AVCodecInternal.hwaccel_priv_data.
3564 * Hardware acceleration should be used for decoding even if the codec level
3565 * used is unknown or higher than the maximum supported level reported by the
3568 * It's generally a good idea to pass this flag unless you have a specific
3569 * reason not to, as hardware tends to under-report supported levels.
3571 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3574 * Hardware acceleration can output YUV pixel formats with a different chroma
3575 * sampling than 4:2:0 and/or other than 8 bits per component.
3577 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3583 #if FF_API_AVPICTURE
3585 * @defgroup lavc_picture AVPicture
3587 * Functions for working with AVPicture
3592 * Picture data structure.
3594 * Up to four components can be stored into it, the last component is
3596 * @deprecated use AVFrame or imgutils functions instead
3598 typedef struct AVPicture {
3599 attribute_deprecated
3600 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3601 attribute_deprecated
3602 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3610 enum AVSubtitleType {
3613 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3616 * Plain text, the text field must be set by the decoder and is
3617 * authoritative. ass and pict fields may contain approximations.
3622 * Formatted text, the ass field must be set by the decoder and is
3623 * authoritative. pict and text fields may contain approximations.
3628 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3630 typedef struct AVSubtitleRect {
3631 int x; ///< top left corner of pict, undefined when pict is not set
3632 int y; ///< top left corner of pict, undefined when pict is not set
3633 int w; ///< width of pict, undefined when pict is not set
3634 int h; ///< height of pict, undefined when pict is not set
3635 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3637 #if FF_API_AVPICTURE
3639 * @deprecated unused
3641 attribute_deprecated
3645 * data+linesize for the bitmap of this subtitle.
3646 * Can be set for text/ass as well once they are rendered.
3651 enum AVSubtitleType type;
3653 char *text; ///< 0 terminated plain UTF-8 text
3656 * 0 terminated ASS/SSA compatible event line.
3657 * The presentation of this is unaffected by the other values in this
3665 typedef struct AVSubtitle {
3666 uint16_t format; /* 0 = graphics */
3667 uint32_t start_display_time; /* relative to packet pts, in ms */
3668 uint32_t end_display_time; /* relative to packet pts, in ms */
3670 AVSubtitleRect **rects;
3671 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3675 * If c is NULL, returns the first registered codec,
3676 * if c is non-NULL, returns the next registered codec after c,
3677 * or NULL if c is the last one.
3679 AVCodec *av_codec_next(const AVCodec *c);
3682 * Return the LIBAVCODEC_VERSION_INT constant.
3684 unsigned avcodec_version(void);
3687 * Return the libavcodec build-time configuration.
3689 const char *avcodec_configuration(void);
3692 * Return the libavcodec license.
3694 const char *avcodec_license(void);
3697 * Register the codec codec and initialize libavcodec.
3699 * @warning either this function or avcodec_register_all() must be called
3700 * before any other libavcodec functions.
3702 * @see avcodec_register_all()
3704 void avcodec_register(AVCodec *codec);
3707 * Register all the codecs, parsers and bitstream filters which were enabled at
3708 * configuration time. If you do not call this function you can select exactly
3709 * which formats you want to support, by using the individual registration
3712 * @see avcodec_register
3713 * @see av_register_codec_parser
3714 * @see av_register_bitstream_filter
3716 void avcodec_register_all(void);
3719 * Allocate an AVCodecContext and set its fields to default values. The
3720 * resulting struct should be freed with avcodec_free_context().
3722 * @param codec if non-NULL, allocate private data and initialize defaults
3723 * for the given codec. It is illegal to then call avcodec_open2()
3724 * with a different codec.
3725 * If NULL, then the codec-specific defaults won't be initialized,
3726 * which may result in suboptimal default settings (this is
3727 * important mainly for encoders, e.g. libx264).
3729 * @return An AVCodecContext filled with default values or NULL on failure.
3730 * @see avcodec_get_context_defaults
3732 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3735 * Free the codec context and everything associated with it and write NULL to
3736 * the provided pointer.
3738 void avcodec_free_context(AVCodecContext **avctx);
3741 * Set the fields of the given AVCodecContext to default values corresponding
3742 * to the given codec (defaults may be codec-dependent).
3744 * Do not call this function if a non-NULL codec has been passed
3745 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3746 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3747 * different codec on this AVCodecContext.
3749 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3752 * Get the AVClass for AVCodecContext. It can be used in combination with
3753 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3755 * @see av_opt_find().
3757 const AVClass *avcodec_get_class(void);
3760 * Get the AVClass for AVFrame. It can be used in combination with
3761 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3763 * @see av_opt_find().
3765 const AVClass *avcodec_get_frame_class(void);
3768 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3769 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3771 * @see av_opt_find().
3773 const AVClass *avcodec_get_subtitle_rect_class(void);
3776 * Copy the settings of the source AVCodecContext into the destination
3777 * AVCodecContext. The resulting destination codec context will be
3778 * unopened, i.e. you are required to call avcodec_open2() before you
3779 * can use this AVCodecContext to decode/encode video/audio data.
3781 * @param dest target codec context, should be initialized with
3782 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3783 * @param src source codec context
3784 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3786 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3789 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3790 * function the context has to be allocated with avcodec_alloc_context3().
3792 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3793 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3794 * retrieving a codec.
3796 * @warning This function is not thread safe!
3798 * @note Always call this function before using decoding routines (such as
3799 * @ref avcodec_decode_video2()).
3802 * avcodec_register_all();
3803 * av_dict_set(&opts, "b", "2.5M", 0);
3804 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3808 * context = avcodec_alloc_context3(codec);
3810 * if (avcodec_open2(context, codec, opts) < 0)
3814 * @param avctx The context to initialize.
3815 * @param codec The codec to open this context for. If a non-NULL codec has been
3816 * previously passed to avcodec_alloc_context3() or
3817 * avcodec_get_context_defaults3() for this context, then this
3818 * parameter MUST be either NULL or equal to the previously passed
3820 * @param options A dictionary filled with AVCodecContext and codec-private options.
3821 * On return this object will be filled with options that were not found.
3823 * @return zero on success, a negative value on error
3824 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3825 * av_dict_set(), av_opt_find().
3827 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3830 * Close a given AVCodecContext and free all the data associated with it
3831 * (but not the AVCodecContext itself).
3833 * Calling this function on an AVCodecContext that hasn't been opened will free
3834 * the codec-specific data allocated in avcodec_alloc_context3() /
3835 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3838 int avcodec_close(AVCodecContext *avctx);
3841 * Free all allocated data in the given subtitle struct.
3843 * @param sub AVSubtitle to free.
3845 void avsubtitle_free(AVSubtitle *sub);
3852 * @addtogroup lavc_packet
3857 * Allocate an AVPacket and set its fields to default values. The resulting
3858 * struct must be freed using av_packet_free().
3860 * @return An AVPacket filled with default values or NULL on failure.
3862 * @note this only allocates the AVPacket itself, not the data buffers. Those
3863 * must be allocated through other means such as av_new_packet.
3865 * @see av_new_packet
3867 AVPacket *av_packet_alloc(void);
3870 * Create a new packet that references the same data as src.
3872 * This is a shortcut for av_packet_alloc()+av_packet_ref().
3874 * @return newly created AVPacket on success, NULL on error.
3876 * @see av_packet_alloc
3877 * @see av_packet_ref
3879 AVPacket *av_packet_clone(AVPacket *src);
3882 * Free the packet, if the packet is reference counted, it will be
3883 * unreferenced first.
3885 * @param packet packet to be freed. The pointer will be set to NULL.
3886 * @note passing NULL is a no-op.
3888 void av_packet_free(AVPacket **pkt);
3891 * Initialize optional fields of a packet with default values.
3893 * Note, this does not touch the data and size members, which have to be
3894 * initialized separately.
3898 void av_init_packet(AVPacket *pkt);
3901 * Allocate the payload of a packet and initialize its fields with
3905 * @param size wanted payload size
3906 * @return 0 if OK, AVERROR_xxx otherwise
3908 int av_new_packet(AVPacket *pkt, int size);
3911 * Reduce packet size, correctly zeroing padding
3914 * @param size new size
3916 void av_shrink_packet(AVPacket *pkt, int size);
3919 * Increase packet size, correctly zeroing padding
3922 * @param grow_by number of bytes by which to increase the size of the packet
3924 int av_grow_packet(AVPacket *pkt, int grow_by);
3927 * Initialize a reference-counted packet from av_malloc()ed data.
3929 * @param pkt packet to be initialized. This function will set the data, size,
3930 * buf and destruct fields, all others are left untouched.
3931 * @param data Data allocated by av_malloc() to be used as packet data. If this
3932 * function returns successfully, the data is owned by the underlying AVBuffer.
3933 * The caller may not access the data through other means.
3934 * @param size size of data in bytes, without the padding. I.e. the full buffer
3935 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
3937 * @return 0 on success, a negative AVERROR on error
3939 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3941 #if FF_API_AVPACKET_OLD_API
3943 * @warning This is a hack - the packet memory allocation stuff is broken. The
3944 * packet is allocated if it was not really allocated.
3946 * @deprecated Use av_packet_ref
3948 attribute_deprecated
3949 int av_dup_packet(AVPacket *pkt);
3951 * Copy packet, including contents
3953 * @return 0 on success, negative AVERROR on fail
3955 int av_copy_packet(AVPacket *dst, const AVPacket *src);
3958 * Copy packet side data
3960 * @return 0 on success, negative AVERROR on fail
3962 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
3967 * @deprecated Use av_packet_unref
3969 * @param pkt packet to free
3971 attribute_deprecated
3972 void av_free_packet(AVPacket *pkt);
3975 * Allocate new information of a packet.
3978 * @param type side information type
3979 * @param size side information size
3980 * @return pointer to fresh allocated data or NULL otherwise
3982 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3986 * Shrink the already allocated side data buffer
3989 * @param type side information type
3990 * @param size new side information size
3991 * @return 0 on success, < 0 on failure
3993 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3997 * Get side information from packet.
4000 * @param type desired side information type
4001 * @param size pointer for side information size to store (optional)
4002 * @return pointer to data if present or NULL otherwise
4004 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4007 int av_packet_merge_side_data(AVPacket *pkt);
4009 int av_packet_split_side_data(AVPacket *pkt);
4011 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4014 * Pack a dictionary for use in side_data.
4016 * @param dict The dictionary to pack.
4017 * @param size pointer to store the size of the returned data
4018 * @return pointer to data if successful, NULL otherwise
4020 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4022 * Unpack a dictionary from side_data.
4024 * @param data data from side_data
4025 * @param size size of the data
4026 * @param dict the metadata storage dictionary
4027 * @return 0 on success, < 0 on failure
4029 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4033 * Convenience function to free all the side data stored.
4034 * All the other fields stay untouched.
4038 void av_packet_free_side_data(AVPacket *pkt);
4041 * Setup a new reference to the data described by a given packet
4043 * If src is reference-counted, setup dst as a new reference to the
4044 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4045 * data from src into it.
4047 * All the other fields are copied from src.
4049 * @see av_packet_unref
4051 * @param dst Destination packet
4052 * @param src Source packet
4054 * @return 0 on success, a negative AVERROR on error.
4056 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4061 * Unreference the buffer referenced by the packet and reset the
4062 * remaining packet fields to their default values.
4064 * @param pkt The packet to be unreferenced.
4066 void av_packet_unref(AVPacket *pkt);
4069 * Move every field in src to dst and reset src.
4071 * @see av_packet_unref
4073 * @param src Source packet, will be reset
4074 * @param dst Destination packet
4076 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4079 * Copy only "properties" fields from src to dst.
4081 * Properties for the purpose of this function are all the fields
4082 * beside those related to the packet data (buf, data, size)
4084 * @param dst Destination packet
4085 * @param src Source packet
4087 * @return 0 on success AVERROR on failure.
4090 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4093 * Convert valid timing fields (timestamps / durations) in a packet from one
4094 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4097 * @param pkt packet on which the conversion will be performed
4098 * @param tb_src source timebase, in which the timing fields in pkt are
4100 * @param tb_dst destination timebase, to which the timing fields will be
4103 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4110 * @addtogroup lavc_decoding
4115 * Find a registered decoder with a matching codec ID.
4117 * @param id AVCodecID of the requested decoder
4118 * @return A decoder if one was found, NULL otherwise.
4120 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4123 * Find a registered decoder with the specified name.
4125 * @param name name of the requested decoder
4126 * @return A decoder if one was found, NULL otherwise.
4128 AVCodec *avcodec_find_decoder_by_name(const char *name);
4131 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4132 * it can be called by custom get_buffer2() implementations for decoders without
4133 * AV_CODEC_CAP_DR1 set.
4135 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4139 * Return the amount of padding in pixels which the get_buffer callback must
4140 * provide around the edge of the image for codecs which do not have the
4141 * CODEC_FLAG_EMU_EDGE flag.
4143 * @return Required padding in pixels.
4145 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4148 attribute_deprecated
4149 unsigned avcodec_get_edge_width(void);
4153 * Modify width and height values so that they will result in a memory
4154 * buffer that is acceptable for the codec if you do not use any horizontal
4157 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4159 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4162 * Modify width and height values so that they will result in a memory
4163 * buffer that is acceptable for the codec if you also ensure that all
4164 * line sizes are a multiple of the respective linesize_align[i].
4166 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4168 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4169 int linesize_align[AV_NUM_DATA_POINTERS]);
4172 * Converts AVChromaLocation to swscale x/y chroma position.
4174 * The positions represent the chroma (0,0) position in a coordinates system
4175 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4177 * @param xpos horizontal chroma sample position
4178 * @param ypos vertical chroma sample position
4180 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4183 * Converts swscale x/y chroma position to AVChromaLocation.
4185 * The positions represent the chroma (0,0) position in a coordinates system
4186 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4188 * @param xpos horizontal chroma sample position
4189 * @param ypos vertical chroma sample position
4191 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4194 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4196 * Some decoders may support multiple frames in a single AVPacket. Such
4197 * decoders would then just decode the first frame and the return value would be
4198 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4199 * called again with an AVPacket containing the remaining data in order to
4200 * decode the second frame, etc... Even if no frames are returned, the packet
4201 * needs to be fed to the decoder with remaining data until it is completely
4202 * consumed or an error occurs.
4204 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4205 * and output. This means that for some packets they will not immediately
4206 * produce decoded output and need to be flushed at the end of decoding to get
4207 * all the decoded data. Flushing is done by calling this function with packets
4208 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4209 * returning samples. It is safe to flush even those decoders that are not
4210 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4212 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4213 * larger than the actual read bytes because some optimized bitstream
4214 * readers read 32 or 64 bits at once and could read over the end.
4216 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4217 * before packets may be fed to the decoder.
4219 * @param avctx the codec context
4220 * @param[out] frame The AVFrame in which to store decoded audio samples.
4221 * The decoder will allocate a buffer for the decoded frame by
4222 * calling the AVCodecContext.get_buffer2() callback.
4223 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4224 * reference counted and the returned reference belongs to the
4225 * caller. The caller must release the frame using av_frame_unref()
4226 * when the frame is no longer needed. The caller may safely write
4227 * to the frame if av_frame_is_writable() returns 1.
4228 * When AVCodecContext.refcounted_frames is set to 0, the returned
4229 * reference belongs to the decoder and is valid only until the
4230 * next call to this function or until closing or flushing the
4231 * decoder. The caller may not write to it.
4232 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4233 * non-zero. Note that this field being set to zero
4234 * does not mean that an error has occurred. For
4235 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4236 * call is guaranteed to produce a frame.
4237 * @param[in] avpkt The input AVPacket containing the input buffer.
4238 * At least avpkt->data and avpkt->size should be set. Some
4239 * decoders might also require additional fields to be set.
4240 * @return A negative error code is returned if an error occurred during
4241 * decoding, otherwise the number of bytes consumed from the input
4242 * AVPacket is returned.
4244 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4245 int *got_frame_ptr, const AVPacket *avpkt);
4248 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4249 * Some decoders may support multiple frames in a single AVPacket, such
4250 * decoders would then just decode the first frame.
4252 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4253 * the actual read bytes because some optimized bitstream readers read 32 or 64
4254 * bits at once and could read over the end.
4256 * @warning The end of the input buffer buf should be set to 0 to ensure that
4257 * no overreading happens for damaged MPEG streams.
4259 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4260 * between input and output, these need to be fed with avpkt->data=NULL,
4261 * avpkt->size=0 at the end to return the remaining frames.
4263 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4264 * before packets may be fed to the decoder.
4266 * @param avctx the codec context
4267 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4268 * Use av_frame_alloc() to get an AVFrame. The codec will
4269 * allocate memory for the actual bitmap by calling the
4270 * AVCodecContext.get_buffer2() callback.
4271 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4272 * reference counted and the returned reference belongs to the
4273 * caller. The caller must release the frame using av_frame_unref()
4274 * when the frame is no longer needed. The caller may safely write
4275 * to the frame if av_frame_is_writable() returns 1.
4276 * When AVCodecContext.refcounted_frames is set to 0, the returned
4277 * reference belongs to the decoder and is valid only until the
4278 * next call to this function or until closing or flushing the
4279 * decoder. The caller may not write to it.
4281 * @param[in] avpkt The input AVPacket containing the input buffer.
4282 * You can create such packet with av_init_packet() and by then setting
4283 * data and size, some decoders might in addition need other fields like
4284 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4286 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4287 * @return On error a negative value is returned, otherwise the number of bytes
4288 * used or zero if no frame could be decompressed.
4290 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4291 int *got_picture_ptr,
4292 const AVPacket *avpkt);
4295 * Decode a subtitle message.
4296 * Return a negative value on error, otherwise return the number of bytes used.
4297 * If no subtitle could be decompressed, got_sub_ptr is zero.
4298 * Otherwise, the subtitle is stored in *sub.
4299 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4300 * simplicity, because the performance difference is expect to be negligible
4301 * and reusing a get_buffer written for video codecs would probably perform badly
4302 * due to a potentially very different allocation pattern.
4304 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4305 * and output. This means that for some packets they will not immediately
4306 * produce decoded output and need to be flushed at the end of decoding to get
4307 * all the decoded data. Flushing is done by calling this function with packets
4308 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4309 * returning subtitles. It is safe to flush even those decoders that are not
4310 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4312 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4313 * before packets may be fed to the decoder.
4315 * @param avctx the codec context
4316 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4317 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4318 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4319 * @param[in] avpkt The input AVPacket containing the input buffer.
4321 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4326 * @defgroup lavc_parsing Frame parsing
4330 enum AVPictureStructure {
4331 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4332 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4333 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4334 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4337 typedef struct AVCodecParserContext {
4339 struct AVCodecParser *parser;
4340 int64_t frame_offset; /* offset of the current frame */
4341 int64_t cur_offset; /* current offset
4342 (incremented by each av_parser_parse()) */
4343 int64_t next_frame_offset; /* offset of the next frame */
4345 int pict_type; /* XXX: Put it back in AVCodecContext. */
4347 * This field is used for proper frame duration computation in lavf.
4348 * It signals, how much longer the frame duration of the current frame
4349 * is compared to normal frame duration.
4351 * frame_duration = (1 + repeat_pict) * time_base
4353 * It is used by codecs like H.264 to display telecined material.
4355 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4356 int64_t pts; /* pts of the current frame */
4357 int64_t dts; /* dts of the current frame */
4362 int fetch_timestamp;
4364 #define AV_PARSER_PTS_NB 4
4365 int cur_frame_start_index;
4366 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4367 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4368 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4371 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4372 #define PARSER_FLAG_ONCE 0x0002
4373 /// Set if the parser has a valid file offset
4374 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4375 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4377 int64_t offset; ///< byte offset from starting packet start
4378 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4381 * Set by parser to 1 for key frames and 0 for non-key frames.
4382 * It is initialized to -1, so if the parser doesn't set this flag,
4383 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4388 #if FF_API_CONVERGENCE_DURATION
4390 * @deprecated unused
4392 attribute_deprecated
4393 int64_t convergence_duration;
4396 // Timestamp generation support:
4398 * Synchronization point for start of timestamp generation.
4400 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4403 * For example, this corresponds to presence of H.264 buffering period
4409 * Offset of the current timestamp against last timestamp sync point in
4410 * units of AVCodecContext.time_base.
4412 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4413 * contain a valid timestamp offset.
4415 * Note that the timestamp of sync point has usually a nonzero
4416 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4417 * the next frame after timestamp sync point will be usually 1.
4419 * For example, this corresponds to H.264 cpb_removal_delay.
4421 int dts_ref_dts_delta;
4424 * Presentation delay of current frame in units of AVCodecContext.time_base.
4426 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4427 * contain valid non-negative timestamp delta (presentation time of a frame
4428 * must not lie in the past).
4430 * This delay represents the difference between decoding and presentation
4431 * time of the frame.
4433 * For example, this corresponds to H.264 dpb_output_delay.
4438 * Position of the packet in file.
4440 * Analogous to cur_frame_pts/dts
4442 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4445 * Byte position of currently parsed frame in stream.
4450 * Previous frame byte position.
4455 * Duration of the current frame.
4456 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4457 * For all other types, this is in units of AVCodecContext.time_base.
4461 enum AVFieldOrder field_order;
4464 * Indicate whether a picture is coded as a frame, top field or bottom field.
4466 * For example, H.264 field_pic_flag equal to 0 corresponds to
4467 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4468 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4469 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4471 enum AVPictureStructure picture_structure;
4474 * Picture number incremented in presentation or output order.
4475 * This field may be reinitialized at the first picture of a new sequence.
4477 * For example, this corresponds to H.264 PicOrderCnt.
4479 int output_picture_number;
4482 * Dimensions of the decoded video intended for presentation.
4488 * Dimensions of the coded video.
4494 * The format of the coded data, corresponds to enum AVPixelFormat for video
4495 * and for enum AVSampleFormat for audio.
4497 * Note that a decoder can have considerable freedom in how exactly it
4498 * decodes the data, so the format reported here might be different from the
4499 * one returned by a decoder.
4502 } AVCodecParserContext;
4504 typedef struct AVCodecParser {
4505 int codec_ids[5]; /* several codec IDs are permitted */
4507 int (*parser_init)(AVCodecParserContext *s);
4508 /* This callback never returns an error, a negative value means that
4509 * the frame start was in a previous packet. */
4510 int (*parser_parse)(AVCodecParserContext *s,
4511 AVCodecContext *avctx,
4512 const uint8_t **poutbuf, int *poutbuf_size,
4513 const uint8_t *buf, int buf_size);
4514 void (*parser_close)(AVCodecParserContext *s);
4515 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4516 struct AVCodecParser *next;
4519 AVCodecParser *av_parser_next(const AVCodecParser *c);
4521 void av_register_codec_parser(AVCodecParser *parser);
4522 AVCodecParserContext *av_parser_init(int codec_id);
4527 * @param s parser context.
4528 * @param avctx codec context.
4529 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4530 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4531 * @param buf input buffer.
4532 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4533 * @param pts input presentation timestamp.
4534 * @param dts input decoding timestamp.
4535 * @param pos input byte position in stream.
4536 * @return the number of bytes of the input bitstream used.
4541 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4548 * decode_frame(data, size);
4552 int av_parser_parse2(AVCodecParserContext *s,
4553 AVCodecContext *avctx,
4554 uint8_t **poutbuf, int *poutbuf_size,
4555 const uint8_t *buf, int buf_size,
4556 int64_t pts, int64_t dts,
4560 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4561 * @deprecated use AVBitStreamFilter
4563 int av_parser_change(AVCodecParserContext *s,
4564 AVCodecContext *avctx,
4565 uint8_t **poutbuf, int *poutbuf_size,
4566 const uint8_t *buf, int buf_size, int keyframe);
4567 void av_parser_close(AVCodecParserContext *s);
4575 * @addtogroup lavc_encoding
4580 * Find a registered encoder with a matching codec ID.
4582 * @param id AVCodecID of the requested encoder
4583 * @return An encoder if one was found, NULL otherwise.
4585 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4588 * Find a registered encoder with the specified name.
4590 * @param name name of the requested encoder
4591 * @return An encoder if one was found, NULL otherwise.
4593 AVCodec *avcodec_find_encoder_by_name(const char *name);
4596 * Encode a frame of audio.
4598 * Takes input samples from frame and writes the next output packet, if
4599 * available, to avpkt. The output packet does not necessarily contain data for
4600 * the most recent frame, as encoders can delay, split, and combine input frames
4601 * internally as needed.
4603 * @param avctx codec context
4604 * @param avpkt output AVPacket.
4605 * The user can supply an output buffer by setting
4606 * avpkt->data and avpkt->size prior to calling the
4607 * function, but if the size of the user-provided data is not
4608 * large enough, encoding will fail. If avpkt->data and
4609 * avpkt->size are set, avpkt->destruct must also be set. All
4610 * other AVPacket fields will be reset by the encoder using
4611 * av_init_packet(). If avpkt->data is NULL, the encoder will
4612 * allocate it. The encoder will set avpkt->size to the size
4613 * of the output packet.
4615 * If this function fails or produces no output, avpkt will be
4616 * freed using av_packet_unref().
4617 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4618 * May be NULL when flushing an encoder that has the
4619 * AV_CODEC_CAP_DELAY capability set.
4620 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4621 * can have any number of samples.
4622 * If it is not set, frame->nb_samples must be equal to
4623 * avctx->frame_size for all frames except the last.
4624 * The final frame may be smaller than avctx->frame_size.
4625 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4626 * output packet is non-empty, and to 0 if it is
4627 * empty. If the function returns an error, the
4628 * packet can be assumed to be invalid, and the
4629 * value of got_packet_ptr is undefined and should
4631 * @return 0 on success, negative error code on failure
4633 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4634 const AVFrame *frame, int *got_packet_ptr);
4637 * Encode a frame of video.
4639 * Takes input raw video data from frame and writes the next output packet, if
4640 * available, to avpkt. The output packet does not necessarily contain data for
4641 * the most recent frame, as encoders can delay and reorder input frames
4642 * internally as needed.
4644 * @param avctx codec context
4645 * @param avpkt output AVPacket.
4646 * The user can supply an output buffer by setting
4647 * avpkt->data and avpkt->size prior to calling the
4648 * function, but if the size of the user-provided data is not
4649 * large enough, encoding will fail. All other AVPacket fields
4650 * will be reset by the encoder using av_init_packet(). If
4651 * avpkt->data is NULL, the encoder will allocate it.
4652 * The encoder will set avpkt->size to the size of the
4653 * output packet. The returned data (if any) belongs to the
4654 * caller, he is responsible for freeing it.
4656 * If this function fails or produces no output, avpkt will be
4657 * freed using av_packet_unref().
4658 * @param[in] frame AVFrame containing the raw video data to be encoded.
4659 * May be NULL when flushing an encoder that has the
4660 * AV_CODEC_CAP_DELAY capability set.
4661 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4662 * output packet is non-empty, and to 0 if it is
4663 * empty. If the function returns an error, the
4664 * packet can be assumed to be invalid, and the
4665 * value of got_packet_ptr is undefined and should
4667 * @return 0 on success, negative error code on failure
4669 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4670 const AVFrame *frame, int *got_packet_ptr);
4672 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4673 const AVSubtitle *sub);
4680 #if FF_API_AVCODEC_RESAMPLE
4682 * @defgroup lavc_resample Audio resampling
4684 * @deprecated use libswresample instead
4688 struct ReSampleContext;
4689 struct AVResampleContext;
4691 typedef struct ReSampleContext ReSampleContext;
4694 * Initialize audio resampling context.
4696 * @param output_channels number of output channels
4697 * @param input_channels number of input channels
4698 * @param output_rate output sample rate
4699 * @param input_rate input sample rate
4700 * @param sample_fmt_out requested output sample format
4701 * @param sample_fmt_in input sample format
4702 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4703 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4704 * @param linear if 1 then the used FIR filter will be linearly interpolated
4705 between the 2 closest, if 0 the closest will be used
4706 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4707 * @return allocated ReSampleContext, NULL if error occurred
4709 attribute_deprecated
4710 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4711 int output_rate, int input_rate,
4712 enum AVSampleFormat sample_fmt_out,
4713 enum AVSampleFormat sample_fmt_in,
4714 int filter_length, int log2_phase_count,
4715 int linear, double cutoff);
4717 attribute_deprecated
4718 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4721 * Free resample context.
4723 * @param s a non-NULL pointer to a resample context previously
4724 * created with av_audio_resample_init()
4726 attribute_deprecated
4727 void audio_resample_close(ReSampleContext *s);
4731 * Initialize an audio resampler.
4732 * Note, if either rate is not an integer then simply scale both rates up so they are.
4733 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4734 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4735 * @param linear If 1 then the used FIR filter will be linearly interpolated
4736 between the 2 closest, if 0 the closest will be used
4737 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4739 attribute_deprecated
4740 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4743 * Resample an array of samples using a previously configured context.
4744 * @param src an array of unconsumed samples
4745 * @param consumed the number of samples of src which have been consumed are returned here
4746 * @param src_size the number of unconsumed samples available
4747 * @param dst_size the amount of space in samples available in dst
4748 * @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.
4749 * @return the number of samples written in dst or -1 if an error occurred
4751 attribute_deprecated
4752 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4756 * Compensate samplerate/timestamp drift. The compensation is done by changing
4757 * the resampler parameters, so no audible clicks or similar distortions occur
4758 * @param compensation_distance distance in output samples over which the compensation should be performed
4759 * @param sample_delta number of output samples which should be output less
4761 * example: av_resample_compensate(c, 10, 500)
4762 * here instead of 510 samples only 500 samples would be output
4764 * note, due to rounding the actual compensation might be slightly different,
4765 * especially if the compensation_distance is large and the in_rate used during init is small
4767 attribute_deprecated
4768 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4769 attribute_deprecated
4770 void av_resample_close(struct AVResampleContext *c);
4777 #if FF_API_AVPICTURE
4779 * @addtogroup lavc_picture
4784 * @deprecated unused
4786 attribute_deprecated
4787 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4790 * @deprecated unused
4792 attribute_deprecated
4793 void avpicture_free(AVPicture *picture);
4796 * @deprecated use av_image_fill_arrays() instead.
4798 attribute_deprecated
4799 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4800 enum AVPixelFormat pix_fmt, int width, int height);
4803 * @deprecated use av_image_copy_to_buffer() instead.
4805 attribute_deprecated
4806 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4807 int width, int height,
4808 unsigned char *dest, int dest_size);
4811 * @deprecated use av_image_get_buffer_size() instead.
4813 attribute_deprecated
4814 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4817 * @deprecated av_image_copy() instead.
4819 attribute_deprecated
4820 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4821 enum AVPixelFormat pix_fmt, int width, int height);
4824 * @deprecated unused
4826 attribute_deprecated
4827 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4828 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4831 * @deprecated unused
4833 attribute_deprecated
4834 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4835 int padtop, int padbottom, int padleft, int padright, int *color);
4843 * @defgroup lavc_misc Utility functions
4846 * Miscellaneous utility functions related to both encoding and decoding
4852 * @defgroup lavc_misc_pixfmt Pixel formats
4854 * Functions for working with pixel formats.
4859 * Utility function to access log2_chroma_w log2_chroma_h from
4860 * the pixel format AVPixFmtDescriptor.
4862 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4863 * for one that returns a failure code and continues in case of invalid
4866 * @param[in] pix_fmt the pixel format
4867 * @param[out] h_shift store log2_chroma_w
4868 * @param[out] v_shift store log2_chroma_h
4870 * @see av_pix_fmt_get_chroma_sub_sample
4873 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4876 * Return a value representing the fourCC code associated to the
4877 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4880 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4883 * @deprecated see av_get_pix_fmt_loss()
4885 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4889 * Find the best pixel format to convert to given a certain source pixel
4890 * format. When converting from one pixel format to another, information loss
4891 * may occur. For example, when converting from RGB24 to GRAY, the color
4892 * information will be lost. Similarly, other losses occur when converting from
4893 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4894 * the given pixel formats should be used to suffer the least amount of loss.
4895 * The pixel formats from which it chooses one, are determined by the
4896 * pix_fmt_list parameter.
4899 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4900 * @param[in] src_pix_fmt source pixel format
4901 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4902 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4903 * @return The best pixel format to convert to or -1 if none was found.
4905 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4906 enum AVPixelFormat src_pix_fmt,
4907 int has_alpha, int *loss_ptr);
4910 * @deprecated see av_find_best_pix_fmt_of_2()
4912 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4913 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4915 attribute_deprecated
4916 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4917 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4918 enum AVPixelFormat src_pix_fmt,
4919 int has_alpha, int *loss_ptr);
4921 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4922 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4926 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4932 #if FF_API_SET_DIMENSIONS
4934 * @deprecated this function is not supposed to be used from outside of lavc
4936 attribute_deprecated
4937 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4941 * Put a string representing the codec tag codec_tag in buf.
4943 * @param buf buffer to place codec tag in
4944 * @param buf_size size in bytes of buf
4945 * @param codec_tag codec tag to assign
4946 * @return the length of the string that would have been generated if
4947 * enough space had been available, excluding the trailing null
4949 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4951 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4954 * Return a name for the specified profile, if available.
4956 * @param codec the codec that is searched for the given profile
4957 * @param profile the profile value for which a name is requested
4958 * @return A name for the profile if found, NULL otherwise.
4960 const char *av_get_profile_name(const AVCodec *codec, int profile);
4962 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4963 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4964 //FIXME func typedef
4967 * Fill AVFrame audio data and linesize pointers.
4969 * The buffer buf must be a preallocated buffer with a size big enough
4970 * to contain the specified samples amount. The filled AVFrame data
4971 * pointers will point to this buffer.
4973 * AVFrame extended_data channel pointers are allocated if necessary for
4976 * @param frame the AVFrame
4977 * frame->nb_samples must be set prior to calling the
4978 * function. This function fills in frame->data,
4979 * frame->extended_data, frame->linesize[0].
4980 * @param nb_channels channel count
4981 * @param sample_fmt sample format
4982 * @param buf buffer to use for frame data
4983 * @param buf_size size of buffer
4984 * @param align plane size sample alignment (0 = default)
4985 * @return >=0 on success, negative error code on failure
4986 * @todo return the size in bytes required to store the samples in
4987 * case of success, at the next libavutil bump
4989 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4990 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4991 int buf_size, int align);
4994 * Reset the internal decoder state / flush internal buffers. Should be called
4995 * e.g. when seeking or when switching to a different stream.
4997 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4998 * this invalidates the frames previously returned from the decoder. When
4999 * refcounted frames are used, the decoder just releases any references it might
5000 * keep internally, but the caller's reference remains valid.
5002 void avcodec_flush_buffers(AVCodecContext *avctx);
5005 * Return codec bits per sample.
5007 * @param[in] codec_id the codec
5008 * @return Number of bits per sample or zero if unknown for the given codec.
5010 int av_get_bits_per_sample(enum AVCodecID codec_id);
5013 * Return the PCM codec associated with a sample format.
5014 * @param be endianness, 0 for little, 1 for big,
5015 * -1 (or anything else) for native
5016 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5018 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5021 * Return codec bits per sample.
5022 * Only return non-zero if the bits per sample is exactly correct, not an
5025 * @param[in] codec_id the codec
5026 * @return Number of bits per sample or zero if unknown for the given codec.
5028 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5031 * Return audio frame duration.
5033 * @param avctx codec context
5034 * @param frame_bytes size of the frame, or 0 if unknown
5035 * @return frame duration, in samples, if known. 0 if not able to
5038 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5041 typedef struct AVBitStreamFilterContext {
5043 struct AVBitStreamFilter *filter;
5044 AVCodecParserContext *parser;
5045 struct AVBitStreamFilterContext *next;
5047 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5048 * Not for access by library users.
5051 } AVBitStreamFilterContext;
5054 typedef struct AVBitStreamFilter {
5057 int (*filter)(AVBitStreamFilterContext *bsfc,
5058 AVCodecContext *avctx, const char *args,
5059 uint8_t **poutbuf, int *poutbuf_size,
5060 const uint8_t *buf, int buf_size, int keyframe);
5061 void (*close)(AVBitStreamFilterContext *bsfc);
5062 struct AVBitStreamFilter *next;
5063 } AVBitStreamFilter;
5066 * Register a bitstream filter.
5068 * The filter will be accessible to the application code through
5069 * av_bitstream_filter_next() or can be directly initialized with
5070 * av_bitstream_filter_init().
5072 * @see avcodec_register_all()
5074 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5077 * Create and initialize a bitstream filter context given a bitstream
5080 * The returned context must be freed with av_bitstream_filter_close().
5082 * @param name the name of the bitstream filter
5083 * @return a bitstream filter context if a matching filter was found
5084 * and successfully initialized, NULL otherwise
5086 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5091 * This function filters the buffer buf with size buf_size, and places the
5092 * filtered buffer in the buffer pointed to by poutbuf.
5094 * The output buffer must be freed by the caller.
5096 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5097 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5098 * If specified, this must point to the encoder context of the
5099 * output stream the packet is sent to.
5100 * @param args arguments which specify the filter configuration, may be NULL
5101 * @param poutbuf pointer which is updated to point to the filtered buffer
5102 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5103 * @param buf buffer containing the data to filter
5104 * @param buf_size size in bytes of buf
5105 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5106 * @return >= 0 in case of success, or a negative error code in case of failure
5108 * If the return value is positive, an output buffer is allocated and
5109 * is available in *poutbuf, and is distinct from the input buffer.
5111 * If the return value is 0, the output buffer is not allocated and
5112 * should be considered identical to the input buffer, or in case
5113 * *poutbuf was set it points to the input buffer (not necessarily to
5114 * its starting address).
5116 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5117 AVCodecContext *avctx, const char *args,
5118 uint8_t **poutbuf, int *poutbuf_size,
5119 const uint8_t *buf, int buf_size, int keyframe);
5122 * Release bitstream filter context.
5124 * @param bsf the bitstream filter context created with
5125 * av_bitstream_filter_init(), can be NULL
5127 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5130 * If f is NULL, return the first registered bitstream filter,
5131 * if f is non-NULL, return the next registered bitstream filter
5132 * after f, or NULL if f is the last one.
5134 * This function can be used to iterate over all registered bitstream
5137 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5142 * Same behaviour av_fast_malloc but the buffer has additional
5143 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5145 * In addition the whole buffer will initially and after resizes
5146 * be 0-initialized so that no uninitialized data will ever appear.
5148 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5151 * Same behaviour av_fast_padded_malloc except that buffer will always
5152 * be 0-initialized after call.
5154 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5157 * Encode extradata length to a buffer. Used by xiph codecs.
5159 * @param s buffer to write to; must be at least (v/255+1) bytes long
5160 * @param v size of extradata in bytes
5161 * @return number of bytes written to the buffer.
5163 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5165 #if FF_API_MISSING_SAMPLE
5167 * Log a generic warning message about a missing feature. This function is
5168 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5169 * only, and would normally not be used by applications.
5170 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5171 * a pointer to an AVClass struct
5172 * @param[in] feature string containing the name of the missing feature
5173 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5174 * If want_sample is non-zero, additional verbage will be added to the log
5175 * message which tells the user how to report samples to the development
5177 * @deprecated Use avpriv_report_missing_feature() instead.
5179 attribute_deprecated
5180 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5183 * Log a generic warning message asking for a sample. This function is
5184 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5185 * only, and would normally not be used by applications.
5186 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5187 * a pointer to an AVClass struct
5188 * @param[in] msg string containing an optional message, or NULL if no message
5189 * @deprecated Use avpriv_request_sample() instead.
5191 attribute_deprecated
5192 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5193 #endif /* FF_API_MISSING_SAMPLE */
5196 * Register the hardware accelerator hwaccel.
5198 void av_register_hwaccel(AVHWAccel *hwaccel);
5201 * If hwaccel is NULL, returns the first registered hardware accelerator,
5202 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5203 * after hwaccel, or NULL if hwaccel is the last one.
5205 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5209 * Lock operation used by lockmgr
5212 AV_LOCK_CREATE, ///< Create a mutex
5213 AV_LOCK_OBTAIN, ///< Lock the mutex
5214 AV_LOCK_RELEASE, ///< Unlock the mutex
5215 AV_LOCK_DESTROY, ///< Free mutex resources
5219 * Register a user provided lock manager supporting the operations
5220 * specified by AVLockOp. The "mutex" argument to the function points
5221 * to a (void *) where the lockmgr should store/get a pointer to a user
5222 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5223 * value left by the last call for all other ops. If the lock manager is
5224 * unable to perform the op then it should leave the mutex in the same
5225 * state as when it was called and return a non-zero value. However,
5226 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5227 * have been successfully destroyed. If av_lockmgr_register succeeds
5228 * it will return a non-negative value, if it fails it will return a
5229 * negative value and destroy all mutex and unregister all callbacks.
5230 * av_lockmgr_register is not thread-safe, it must be called from a
5231 * single thread before any calls which make use of locking are used.
5233 * @param cb User defined callback. av_lockmgr_register invokes calls
5234 * to this callback and the previously registered callback.
5235 * The callback will be used to create more than one mutex
5236 * each of which must be backed by its own underlying locking
5237 * mechanism (i.e. do not use a single static object to
5238 * implement your lock manager). If cb is set to NULL the
5239 * lockmgr will be unregistered.
5241 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5244 * Get the type of the given codec.
5246 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5249 * Get the name of a codec.
5250 * @return a static string identifying the codec; never NULL
5252 const char *avcodec_get_name(enum AVCodecID id);
5255 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5256 * with no corresponding avcodec_close()), 0 otherwise.
5258 int avcodec_is_open(AVCodecContext *s);
5261 * @return a non-zero number if codec is an encoder, zero otherwise
5263 int av_codec_is_encoder(const AVCodec *codec);
5266 * @return a non-zero number if codec is a decoder, zero otherwise
5268 int av_codec_is_decoder(const AVCodec *codec);
5271 * @return descriptor for given codec ID or NULL if no descriptor exists.
5273 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5276 * Iterate over all codec descriptors known to libavcodec.
5278 * @param prev previous descriptor. NULL to get the first descriptor.
5280 * @return next descriptor or NULL after the last descriptor
5282 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5285 * @return codec descriptor with the given name or NULL if no such descriptor
5288 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5294 #endif /* AVCODEC_AVCODEC_H */