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];
1189 * This structure describes the bitrate properties of an encoded bitstream. It
1190 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1191 * parameters for H.264/HEVC.
1193 typedef struct AVCPBProperties {
1195 * Maximum bitrate of the stream, in bits per second.
1196 * Zero if unknown or unspecified.
1200 * Minimum bitrate of the stream, in bits per second.
1201 * Zero if unknown or unspecified.
1205 * Average bitrate of the stream, in bits per second.
1206 * Zero if unknown or unspecified.
1211 * The size of the buffer to which the ratecontrol is applied, in bits.
1212 * Zero if unknown or unspecified.
1217 * The delay between the time the packet this structure is associated with
1218 * is received and the time when it should be decoded, in periods of a 27MHz
1221 * UINT64_MAX when unknown or unspecified.
1226 #if FF_API_QSCALE_TYPE
1227 #define FF_QSCALE_TYPE_MPEG1 0
1228 #define FF_QSCALE_TYPE_MPEG2 1
1229 #define FF_QSCALE_TYPE_H264 2
1230 #define FF_QSCALE_TYPE_VP56 3
1234 * The decoder will keep a reference to the frame and may reuse it later.
1236 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1239 * @defgroup lavc_packet AVPacket
1241 * Types and functions for working with AVPacket.
1244 enum AVPacketSideDataType {
1245 AV_PKT_DATA_PALETTE,
1246 AV_PKT_DATA_NEW_EXTRADATA,
1249 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1252 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1253 * s32le channel_count
1254 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1255 * u64le channel_layout
1256 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1258 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1263 AV_PKT_DATA_PARAM_CHANGE,
1266 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1267 * structures with info about macroblocks relevant to splitting the
1268 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1269 * That is, it does not necessarily contain info about all macroblocks,
1270 * as long as the distance between macroblocks in the info is smaller
1271 * than the target payload size.
1272 * Each MB info structure is 12 bytes, and is laid out as follows:
1274 * u32le bit offset from the start of the packet
1275 * u8 current quantizer at the start of the macroblock
1277 * u16le macroblock address within the GOB
1278 * u8 horizontal MV predictor
1279 * u8 vertical MV predictor
1280 * u8 horizontal MV predictor for block number 3
1281 * u8 vertical MV predictor for block number 3
1284 AV_PKT_DATA_H263_MB_INFO,
1287 * This side data should be associated with an audio stream and contains
1288 * ReplayGain information in form of the AVReplayGain struct.
1290 AV_PKT_DATA_REPLAYGAIN,
1293 * This side data contains a 3x3 transformation matrix describing an affine
1294 * transformation that needs to be applied to the decoded video frames for
1295 * correct presentation.
1297 * See libavutil/display.h for a detailed description of the data.
1299 AV_PKT_DATA_DISPLAYMATRIX,
1302 * This side data should be associated with a video stream and contains
1303 * Stereoscopic 3D information in form of the AVStereo3D struct.
1305 AV_PKT_DATA_STEREO3D,
1308 * This side data should be associated with an audio stream and corresponds
1309 * to enum AVAudioServiceType.
1311 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1314 * This side data contains quality related information from the encoder.
1316 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1320 * u64le[error count] sum of squared differences between encoder in and output
1323 AV_PKT_DATA_QUALITY_STATS,
1326 * This side data contains an integer value representing the stream index
1327 * of a "fallback" track. A fallback track indicates an alternate
1328 * track to use when the current track can not be decoded for some reason.
1329 * e.g. no decoder available for codec.
1331 AV_PKT_DATA_FALLBACK_TRACK,
1334 * This side data corresponds to the AVCPBProperties struct.
1336 AV_PKT_DATA_CPB_PROPERTIES,
1339 * Recommmends skipping the specified number of samples
1341 * u32le number of samples to skip from start of this packet
1342 * u32le number of samples to skip from end of this packet
1343 * u8 reason for start skip
1344 * u8 reason for end skip (0=padding silence, 1=convergence)
1347 AV_PKT_DATA_SKIP_SAMPLES=70,
1350 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1351 * the packet may contain "dual mono" audio specific to Japanese DTV
1352 * and if it is true, recommends only the selected channel to be used.
1354 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1357 AV_PKT_DATA_JP_DUALMONO,
1360 * A list of zero terminated key/value strings. There is no end marker for
1361 * the list, so it is required to rely on the side data size to stop.
1363 AV_PKT_DATA_STRINGS_METADATA,
1366 * Subtitle event position
1374 AV_PKT_DATA_SUBTITLE_POSITION,
1377 * Data found in BlockAdditional element of matroska container. There is
1378 * no end marker for the data, so it is required to rely on the side data
1379 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1382 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1385 * The optional first identifier line of a WebVTT cue.
1387 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1390 * The optional settings (rendering instructions) that immediately
1391 * follow the timestamp specifier of a WebVTT cue.
1393 AV_PKT_DATA_WEBVTT_SETTINGS,
1396 * A list of zero terminated key/value strings. There is no end marker for
1397 * the list, so it is required to rely on the side data size to stop. This
1398 * side data includes updated metadata which appeared in the stream.
1400 AV_PKT_DATA_METADATA_UPDATE,
1403 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1405 typedef struct AVPacketSideData {
1408 enum AVPacketSideDataType type;
1412 * This structure stores compressed data. It is typically exported by demuxers
1413 * and then passed as input to decoders, or received as output from encoders and
1414 * then passed to muxers.
1416 * For video, it should typically contain one compressed frame. For audio it may
1417 * contain several compressed frames. Encoders are allowed to output empty
1418 * packets, with no compressed data, containing only side data
1419 * (e.g. to update some stream parameters at the end of encoding).
1421 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1422 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1423 * without libavcodec and libavformat major bump.
1425 * The semantics of data ownership depends on the buf field.
1426 * If it is set, the packet data is dynamically allocated and is
1427 * valid indefinitely until a call to av_packet_unref() reduces the
1428 * reference count to 0.
1430 * If the buf field is not set av_packet_ref() would make a copy instead
1431 * of increasing the reference count.
1433 * The side data is always allocated with av_malloc(), copied by
1434 * av_packet_ref() and freed by av_packet_unref().
1436 * @see av_packet_ref
1437 * @see av_packet_unref
1439 typedef struct AVPacket {
1441 * A reference to the reference-counted buffer where the packet data is
1443 * May be NULL, then the packet data is not reference-counted.
1447 * Presentation timestamp in AVStream->time_base units; the time at which
1448 * the decompressed packet will be presented to the user.
1449 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1450 * pts MUST be larger or equal to dts as presentation cannot happen before
1451 * decompression, unless one wants to view hex dumps. Some formats misuse
1452 * the terms dts and pts/cts to mean something different. Such timestamps
1453 * must be converted to true pts/dts before they are stored in AVPacket.
1457 * Decompression timestamp in AVStream->time_base units; the time at which
1458 * the packet is decompressed.
1459 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1466 * A combination of AV_PKT_FLAG values
1470 * Additional packet data that can be provided by the container.
1471 * Packet can contain several types of side information.
1473 AVPacketSideData *side_data;
1474 int side_data_elems;
1477 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1478 * Equals next_pts - this_pts in presentation order.
1482 int64_t pos; ///< byte position in stream, -1 if unknown
1484 #if FF_API_CONVERGENCE_DURATION
1486 * @deprecated Same as the duration field, but as int64_t. This was required
1487 * for Matroska subtitles, whose duration values could overflow when the
1488 * duration field was still an int.
1490 attribute_deprecated
1491 int64_t convergence_duration;
1494 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1495 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1497 enum AVSideDataParamChangeFlags {
1498 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1499 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1500 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1501 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1507 struct AVCodecInternal;
1511 AV_FIELD_PROGRESSIVE,
1512 AV_FIELD_TT, //< Top coded_first, top displayed first
1513 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1514 AV_FIELD_TB, //< Top coded first, bottom displayed first
1515 AV_FIELD_BT, //< Bottom coded first, top displayed first
1519 * main external API structure.
1520 * New fields can be added to the end with minor version bumps.
1521 * Removal, reordering and changes to existing fields require a major
1523 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1525 * sizeof(AVCodecContext) must not be used outside libav*.
1527 typedef struct AVCodecContext {
1529 * information on struct for av_log
1530 * - set by avcodec_alloc_context3
1532 const AVClass *av_class;
1533 int log_level_offset;
1535 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1536 const struct AVCodec *codec;
1537 #if FF_API_CODEC_NAME
1539 * @deprecated this field is not used for anything in libavcodec
1541 attribute_deprecated
1542 char codec_name[32];
1544 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1547 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1548 * This is used to work around some encoder bugs.
1549 * A demuxer should set this to what is stored in the field used to identify the codec.
1550 * If there are multiple such fields in a container then the demuxer should choose the one
1551 * which maximizes the information about the used codec.
1552 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1553 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1554 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1556 * - encoding: Set by user, if not then the default based on codec_id will be used.
1557 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1559 unsigned int codec_tag;
1561 #if FF_API_STREAM_CODEC_TAG
1563 * @deprecated this field is unused
1565 attribute_deprecated
1566 unsigned int stream_codec_tag;
1572 * Private context used for internal data.
1574 * Unlike priv_data, this is not codec-specific. It is used in general
1575 * libavcodec functions.
1577 struct AVCodecInternal *internal;
1580 * Private data of the user, can be used to carry app specific stuff.
1581 * - encoding: Set by user.
1582 * - decoding: Set by user.
1587 * the average bitrate
1588 * - encoding: Set by user; unused for constant quantizer encoding.
1589 * - decoding: Set by user, may be overwritten by libavcodec
1590 * if this info is available in the stream
1595 * number of bits the bitstream is allowed to diverge from the reference.
1596 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1597 * - encoding: Set by user; unused for constant quantizer encoding.
1598 * - decoding: unused
1600 int bit_rate_tolerance;
1603 * Global quality for codecs which cannot change it per frame.
1604 * This should be proportional to MPEG-1/2/4 qscale.
1605 * - encoding: Set by user.
1606 * - decoding: unused
1611 * - encoding: Set by user.
1612 * - decoding: unused
1614 int compression_level;
1615 #define FF_COMPRESSION_DEFAULT -1
1619 * - encoding: Set by user.
1620 * - decoding: Set by user.
1626 * - encoding: Set by user.
1627 * - decoding: Set by user.
1632 * some codecs need / can use extradata like Huffman tables.
1633 * mjpeg: Huffman tables
1634 * rv10: additional flags
1635 * mpeg4: global headers (they can be in the bitstream or here)
1636 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1637 * than extradata_size to avoid problems if it is read with the bitstream reader.
1638 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1639 * - encoding: Set/allocated/freed by libavcodec.
1640 * - decoding: Set/allocated/freed by user.
1646 * This is the fundamental unit of time (in seconds) in terms
1647 * of which frame timestamps are represented. For fixed-fps content,
1648 * timebase should be 1/framerate and timestamp increments should be
1650 * This often, but not always is the inverse of the frame rate or field rate
1652 * - encoding: MUST be set by user.
1653 * - decoding: the use of this field for decoding is deprecated.
1654 * Use framerate instead.
1656 AVRational time_base;
1659 * For some codecs, the time base is closer to the field rate than the frame rate.
1660 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1661 * if no telecine is used ...
1663 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1665 int ticks_per_frame;
1670 * Encoding: Number of frames delay there will be from the encoder input to
1671 * the decoder output. (we assume the decoder matches the spec)
1672 * Decoding: Number of frames delay in addition to what a standard decoder
1673 * as specified in the spec would produce.
1676 * Number of frames the decoded output will be delayed relative to the
1680 * For encoding, this field is unused (see initial_padding).
1682 * For decoding, this is the number of samples the decoder needs to
1683 * output before the decoder's output is valid. When seeking, you should
1684 * start decoding this many samples prior to your desired seek point.
1686 * - encoding: Set by libavcodec.
1687 * - decoding: Set by libavcodec.
1694 * picture width / height.
1696 * @note Those fields may not match the values of the last
1697 * AVFrame outputted by avcodec_decode_video2 due frame
1700 * - encoding: MUST be set by user.
1701 * - decoding: May be set by the user before opening the decoder if known e.g.
1702 * from the container. Some decoders will require the dimensions
1703 * to be set by the caller. During decoding, the decoder may
1704 * overwrite those values as required while parsing the data.
1709 * Bitstream width / height, may be different from width/height e.g. when
1710 * the decoded frame is cropped before being output or lowres is enabled.
1712 * @note Those field may not match the value of the last
1713 * AVFrame outputted by avcodec_decode_video2 due frame
1716 * - encoding: unused
1717 * - decoding: May be set by the user before opening the decoder if known
1718 * e.g. from the container. During decoding, the decoder may
1719 * overwrite those values as required while parsing the data.
1721 int coded_width, coded_height;
1723 #if FF_API_ASPECT_EXTENDED
1724 #define FF_ASPECT_EXTENDED 15
1728 * the number of pictures in a group of pictures, or 0 for intra_only
1729 * - encoding: Set by user.
1730 * - decoding: unused
1735 * Pixel format, see AV_PIX_FMT_xxx.
1736 * May be set by the demuxer if known from headers.
1737 * May be overridden by the decoder if it knows better.
1739 * @note This field may not match the value of the last
1740 * AVFrame outputted by avcodec_decode_video2 due frame
1743 * - encoding: Set by user.
1744 * - decoding: Set by user if known, overridden by libavcodec while
1747 enum AVPixelFormat pix_fmt;
1749 #if FF_API_MOTION_EST
1751 * This option does nothing
1752 * @deprecated use codec private options instead
1754 attribute_deprecated int me_method;
1758 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1759 * decoder to draw a horizontal band. It improves cache usage. Not
1760 * all codecs can do that. You must check the codec capabilities
1762 * When multithreading is used, it may be called from multiple threads
1763 * at the same time; threads might draw different parts of the same AVFrame,
1764 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1766 * The function is also used by hardware acceleration APIs.
1767 * It is called at least once during frame decoding to pass
1768 * the data needed for hardware render.
1769 * In that mode instead of pixel data, AVFrame points to
1770 * a structure specific to the acceleration API. The application
1771 * reads the structure and can change some fields to indicate progress
1773 * - encoding: unused
1774 * - decoding: Set by user.
1775 * @param height the height of the slice
1776 * @param y the y position of the slice
1777 * @param type 1->top field, 2->bottom field, 3->frame
1778 * @param offset offset into the AVFrame.data from which the slice should be read
1780 void (*draw_horiz_band)(struct AVCodecContext *s,
1781 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1782 int y, int type, int height);
1785 * callback to negotiate the pixelFormat
1786 * @param fmt is the list of formats which are supported by the codec,
1787 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1788 * The first is always the native one.
1789 * @note The callback may be called again immediately if initialization for
1790 * the selected (hardware-accelerated) pixel format failed.
1791 * @warning Behavior is undefined if the callback returns a value not
1792 * in the fmt list of formats.
1793 * @return the chosen format
1794 * - encoding: unused
1795 * - decoding: Set by user, if not set the native format will be chosen.
1797 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1800 * maximum number of B-frames between non-B-frames
1801 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1802 * - encoding: Set by user.
1803 * - decoding: unused
1808 * qscale factor between IP and B-frames
1809 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1810 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1811 * - encoding: Set by user.
1812 * - decoding: unused
1814 float b_quant_factor;
1816 #if FF_API_RC_STRATEGY
1817 /** @deprecated use codec private option instead */
1818 attribute_deprecated int rc_strategy;
1819 #define FF_RC_STRATEGY_XVID 1
1822 int b_frame_strategy;
1825 * qscale offset between IP and B-frames
1826 * - encoding: Set by user.
1827 * - decoding: unused
1829 float b_quant_offset;
1832 * Size of the frame reordering buffer in the decoder.
1833 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1834 * - encoding: Set by libavcodec.
1835 * - decoding: Set by libavcodec.
1840 * 0-> h263 quant 1-> mpeg quant
1841 * - encoding: Set by user.
1842 * - decoding: unused
1847 * qscale factor between P and I-frames
1848 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1849 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1850 * - encoding: Set by user.
1851 * - decoding: unused
1853 float i_quant_factor;
1856 * qscale offset between P and I-frames
1857 * - encoding: Set by user.
1858 * - decoding: unused
1860 float i_quant_offset;
1863 * luminance masking (0-> disabled)
1864 * - encoding: Set by user.
1865 * - decoding: unused
1870 * temporary complexity masking (0-> disabled)
1871 * - encoding: Set by user.
1872 * - decoding: unused
1874 float temporal_cplx_masking;
1877 * spatial complexity masking (0-> disabled)
1878 * - encoding: Set by user.
1879 * - decoding: unused
1881 float spatial_cplx_masking;
1884 * p block masking (0-> disabled)
1885 * - encoding: Set by user.
1886 * - decoding: unused
1891 * darkness masking (0-> disabled)
1892 * - encoding: Set by user.
1893 * - decoding: unused
1899 * - encoding: Set by libavcodec.
1900 * - decoding: Set by user (or 0).
1904 * prediction method (needed for huffyuv)
1905 * - encoding: Set by user.
1906 * - decoding: unused
1908 int prediction_method;
1909 #define FF_PRED_LEFT 0
1910 #define FF_PRED_PLANE 1
1911 #define FF_PRED_MEDIAN 2
1914 * slice offsets in the frame in bytes
1915 * - encoding: Set/allocated by libavcodec.
1916 * - decoding: Set/allocated by user (or NULL).
1921 * sample aspect ratio (0 if unknown)
1922 * That is the width of a pixel divided by the height of the pixel.
1923 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1924 * - encoding: Set by user.
1925 * - decoding: Set by libavcodec.
1927 AVRational sample_aspect_ratio;
1930 * motion estimation comparison function
1931 * - encoding: Set by user.
1932 * - decoding: unused
1936 * subpixel motion estimation comparison function
1937 * - encoding: Set by user.
1938 * - decoding: unused
1942 * macroblock comparison function (not supported yet)
1943 * - encoding: Set by user.
1944 * - decoding: unused
1948 * interlaced DCT comparison function
1949 * - encoding: Set by user.
1950 * - decoding: unused
1953 #define FF_CMP_SAD 0
1954 #define FF_CMP_SSE 1
1955 #define FF_CMP_SATD 2
1956 #define FF_CMP_DCT 3
1957 #define FF_CMP_PSNR 4
1958 #define FF_CMP_BIT 5
1960 #define FF_CMP_ZERO 7
1961 #define FF_CMP_VSAD 8
1962 #define FF_CMP_VSSE 9
1963 #define FF_CMP_NSSE 10
1964 #define FF_CMP_W53 11
1965 #define FF_CMP_W97 12
1966 #define FF_CMP_DCTMAX 13
1967 #define FF_CMP_DCT264 14
1968 #define FF_CMP_CHROMA 256
1971 * ME diamond size & shape
1972 * - encoding: Set by user.
1973 * - decoding: unused
1978 * amount of previous MV predictors (2a+1 x 2a+1 square)
1979 * - encoding: Set by user.
1980 * - decoding: unused
1982 int last_predictor_count;
1985 * prepass for motion estimation
1986 * - encoding: Set by user.
1987 * - decoding: unused
1992 * motion estimation prepass comparison function
1993 * - encoding: Set by user.
1994 * - decoding: unused
1999 * ME prepass diamond size & shape
2000 * - encoding: Set by user.
2001 * - decoding: unused
2007 * - encoding: Set by user.
2008 * - decoding: unused
2010 int me_subpel_quality;
2014 * DTG active format information (additional aspect ratio
2015 * information only used in DVB MPEG-2 transport streams)
2018 * - encoding: unused
2019 * - decoding: Set by decoder.
2020 * @deprecated Deprecated in favor of AVSideData
2022 attribute_deprecated int dtg_active_format;
2023 #define FF_DTG_AFD_SAME 8
2024 #define FF_DTG_AFD_4_3 9
2025 #define FF_DTG_AFD_16_9 10
2026 #define FF_DTG_AFD_14_9 11
2027 #define FF_DTG_AFD_4_3_SP_14_9 13
2028 #define FF_DTG_AFD_16_9_SP_14_9 14
2029 #define FF_DTG_AFD_SP_4_3 15
2030 #endif /* FF_API_AFD */
2033 * maximum motion estimation search range in subpel units
2034 * If 0 then no limit.
2036 * - encoding: Set by user.
2037 * - decoding: unused
2041 #if FF_API_QUANT_BIAS
2043 * @deprecated use encoder private option instead
2045 attribute_deprecated int intra_quant_bias;
2046 #define FF_DEFAULT_QUANT_BIAS 999999
2049 * @deprecated use encoder private option instead
2051 attribute_deprecated int inter_quant_bias;
2056 * - encoding: unused
2057 * - decoding: Set by user.
2060 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2061 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2062 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2066 * XVideo Motion Acceleration
2067 * - encoding: forbidden
2068 * - decoding: set by decoder
2069 * @deprecated XvMC doesn't need it anymore.
2071 attribute_deprecated int xvmc_acceleration;
2072 #endif /* FF_API_XVMC */
2075 * macroblock decision mode
2076 * - encoding: Set by user.
2077 * - decoding: unused
2080 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2081 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2082 #define FF_MB_DECISION_RD 2 ///< rate distortion
2085 * custom intra quantization matrix
2086 * - encoding: Set by user, can be NULL.
2087 * - decoding: Set by libavcodec.
2089 uint16_t *intra_matrix;
2092 * custom inter quantization matrix
2093 * - encoding: Set by user, can be NULL.
2094 * - decoding: Set by libavcodec.
2096 uint16_t *inter_matrix;
2099 * scene change detection threshold
2100 * 0 is default, larger means fewer detected scene changes.
2101 * - encoding: Set by user.
2102 * - decoding: unused
2104 int scenechange_threshold;
2107 * noise reduction strength
2108 * - encoding: Set by user.
2109 * - decoding: unused
2111 int noise_reduction;
2115 * @deprecated this field is unused
2117 attribute_deprecated
2121 * @deprecated this field is unused
2123 attribute_deprecated
2128 * precision of the intra DC coefficient - 8
2129 * - encoding: Set by user.
2130 * - decoding: Set by libavcodec
2132 int intra_dc_precision;
2135 * Number of macroblock rows at the top which are skipped.
2136 * - encoding: unused
2137 * - decoding: Set by user.
2142 * Number of macroblock rows at the bottom which are skipped.
2143 * - encoding: unused
2144 * - decoding: Set by user.
2150 * @deprecated use encoder private options instead
2152 attribute_deprecated
2153 float border_masking;
2157 * minimum MB lagrange multipler
2158 * - encoding: Set by user.
2159 * - decoding: unused
2164 * maximum MB lagrange multipler
2165 * - encoding: Set by user.
2166 * - decoding: unused
2172 * - encoding: Set by user.
2173 * - decoding: unused
2175 int me_penalty_compensation;
2179 * - encoding: Set by user.
2180 * - decoding: unused
2186 * - encoding: Set by user.
2187 * - decoding: unused
2193 * - encoding: Set by user.
2194 * - decoding: unused
2199 * number of reference frames
2200 * - encoding: Set by user.
2201 * - decoding: Set by lavc.
2206 * chroma qp offset from luma
2207 * - encoding: Set by user.
2208 * - decoding: unused
2212 #if FF_API_UNUSED_MEMBERS
2214 * Multiplied by qscale for each frame and added to scene_change_score.
2215 * - encoding: Set by user.
2216 * - decoding: unused
2218 attribute_deprecated int scenechange_factor;
2223 * Note: Value depends upon the compare function used for fullpel ME.
2224 * - encoding: Set by user.
2225 * - decoding: unused
2230 * Adjust sensitivity of b_frame_strategy 1.
2231 * - encoding: Set by user.
2232 * - decoding: unused
2237 * Chromaticity coordinates of the source primaries.
2238 * - encoding: Set by user
2239 * - decoding: Set by libavcodec
2241 enum AVColorPrimaries color_primaries;
2244 * Color Transfer Characteristic.
2245 * - encoding: Set by user
2246 * - decoding: Set by libavcodec
2248 enum AVColorTransferCharacteristic color_trc;
2251 * YUV colorspace type.
2252 * - encoding: Set by user
2253 * - decoding: Set by libavcodec
2255 enum AVColorSpace colorspace;
2258 * MPEG vs JPEG YUV range.
2259 * - encoding: Set by user
2260 * - decoding: Set by libavcodec
2262 enum AVColorRange color_range;
2265 * This defines the location of chroma samples.
2266 * - encoding: Set by user
2267 * - decoding: Set by libavcodec
2269 enum AVChromaLocation chroma_sample_location;
2273 * Indicates number of picture subdivisions. Used for parallelized
2275 * - encoding: Set by user
2276 * - decoding: unused
2281 * - encoding: set by libavcodec
2282 * - decoding: Set by user.
2284 enum AVFieldOrder field_order;
2287 int sample_rate; ///< samples per second
2288 int channels; ///< number of audio channels
2291 * audio sample format
2292 * - encoding: Set by user.
2293 * - decoding: Set by libavcodec.
2295 enum AVSampleFormat sample_fmt; ///< sample format
2297 /* The following data should not be initialized. */
2299 * Number of samples per channel in an audio frame.
2301 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2302 * except the last must contain exactly frame_size samples per channel.
2303 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2304 * frame size is not restricted.
2305 * - decoding: may be set by some decoders to indicate constant frame size
2310 * Frame counter, set by libavcodec.
2312 * - decoding: total number of frames returned from the decoder so far.
2313 * - encoding: total number of frames passed to the encoder so far.
2315 * @note the counter is not incremented if encoding/decoding resulted in
2321 * number of bytes per packet if constant and known or 0
2322 * Used by some WAV based audio codecs.
2327 * Audio cutoff bandwidth (0 means "automatic")
2328 * - encoding: Set by user.
2329 * - decoding: unused
2334 * Audio channel layout.
2335 * - encoding: set by user.
2336 * - decoding: set by user, may be overwritten by libavcodec.
2338 uint64_t channel_layout;
2341 * Request decoder to use this channel layout if it can (0 for default)
2342 * - encoding: unused
2343 * - decoding: Set by user.
2345 uint64_t request_channel_layout;
2348 * Type of service that the audio stream conveys.
2349 * - encoding: Set by user.
2350 * - decoding: Set by libavcodec.
2352 enum AVAudioServiceType audio_service_type;
2355 * desired sample format
2356 * - encoding: Not used.
2357 * - decoding: Set by user.
2358 * Decoder will decode to this format if it can.
2360 enum AVSampleFormat request_sample_fmt;
2363 * This callback is called at the beginning of each frame to get data
2364 * buffer(s) for it. There may be one contiguous buffer for all the data or
2365 * there may be a buffer per each data plane or anything in between. What
2366 * this means is, you may set however many entries in buf[] you feel necessary.
2367 * Each buffer must be reference-counted using the AVBuffer API (see description
2370 * The following fields will be set in the frame before this callback is
2373 * - width, height (video only)
2374 * - sample_rate, channel_layout, nb_samples (audio only)
2375 * Their values may differ from the corresponding values in
2376 * AVCodecContext. This callback must use the frame values, not the codec
2377 * context values, to calculate the required buffer size.
2379 * This callback must fill the following fields in the frame:
2383 * * if the data is planar audio with more than 8 channels, then this
2384 * callback must allocate and fill extended_data to contain all pointers
2385 * to all data planes. data[] must hold as many pointers as it can.
2386 * extended_data must be allocated with av_malloc() and will be freed in
2388 * * otherwise exended_data must point to data
2389 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2390 * the frame's data and extended_data pointers must be contained in these. That
2391 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2392 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2393 * and av_buffer_ref().
2394 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2395 * this callback and filled with the extra buffers if there are more
2396 * buffers than buf[] can hold. extended_buf will be freed in
2399 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2400 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2403 * Each data plane must be aligned to the maximum required by the target
2406 * @see avcodec_default_get_buffer2()
2410 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2411 * (read and/or written to if it is writable) later by libavcodec.
2413 * avcodec_align_dimensions2() should be used to find the required width and
2414 * height, as they normally need to be rounded up to the next multiple of 16.
2416 * Some decoders do not support linesizes changing between frames.
2418 * If frame multithreading is used and thread_safe_callbacks is set,
2419 * this callback may be called from a different thread, but not from more
2420 * than one at once. Does not need to be reentrant.
2422 * @see avcodec_align_dimensions2()
2426 * Decoders request a buffer of a particular size by setting
2427 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2428 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2429 * to a smaller value in the output frame.
2431 * As a convenience, av_samples_get_buffer_size() and
2432 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2433 * functions to find the required data size and to fill data pointers and
2434 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2435 * since all planes must be the same size.
2437 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2439 * - encoding: unused
2440 * - decoding: Set by libavcodec, user can override.
2442 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2445 * If non-zero, the decoded audio and video frames returned from
2446 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2447 * and are valid indefinitely. The caller must free them with
2448 * av_frame_unref() when they are not needed anymore.
2449 * Otherwise, the decoded frames must not be freed by the caller and are
2450 * only valid until the next decode call.
2452 * - encoding: unused
2453 * - decoding: set by the caller before avcodec_open2().
2455 int refcounted_frames;
2457 /* - encoding parameters */
2458 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2459 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2463 * - encoding: Set by user.
2464 * - decoding: unused
2470 * - encoding: Set by user.
2471 * - decoding: unused
2476 * maximum quantizer difference between frames
2477 * - encoding: Set by user.
2478 * - decoding: unused
2484 * @deprecated use encoder private options instead
2486 attribute_deprecated
2489 attribute_deprecated
2491 attribute_deprecated
2496 * decoder bitstream buffer size
2497 * - encoding: Set by user.
2498 * - decoding: unused
2503 * ratecontrol override, see RcOverride
2504 * - encoding: Allocated/set/freed by user.
2505 * - decoding: unused
2507 int rc_override_count;
2508 RcOverride *rc_override;
2512 * @deprecated use encoder private options instead
2514 attribute_deprecated
2520 * - encoding: Set by user.
2521 * - decoding: Set by user, may be overwritten by libavcodec.
2523 int64_t rc_max_rate;
2527 * - encoding: Set by user.
2528 * - decoding: unused
2530 int64_t rc_min_rate;
2534 * @deprecated use encoder private options instead
2536 attribute_deprecated
2537 float rc_buffer_aggressivity;
2539 attribute_deprecated
2540 float rc_initial_cplx;
2544 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2545 * - encoding: Set by user.
2546 * - decoding: unused.
2548 float rc_max_available_vbv_use;
2551 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2552 * - encoding: Set by user.
2553 * - decoding: unused.
2555 float rc_min_vbv_overflow_use;
2558 * Number of bits which should be loaded into the rc buffer before decoding starts.
2559 * - encoding: Set by user.
2560 * - decoding: unused
2562 int rc_initial_buffer_occupancy;
2564 #define FF_CODER_TYPE_VLC 0
2565 #define FF_CODER_TYPE_AC 1
2566 #define FF_CODER_TYPE_RAW 2
2567 #define FF_CODER_TYPE_RLE 3
2568 #if FF_API_UNUSED_MEMBERS
2569 #define FF_CODER_TYPE_DEFLATE 4
2570 #endif /* FF_API_UNUSED_MEMBERS */
2573 * - encoding: Set by user.
2574 * - decoding: unused
2580 * - encoding: Set by user.
2581 * - decoding: unused
2587 * @deprecated use encoder private options instead
2589 attribute_deprecated
2593 * @deprecated use encoder private options instead
2595 attribute_deprecated
2600 * frame skip threshold
2601 * - encoding: Set by user.
2602 * - decoding: unused
2604 int frame_skip_threshold;
2608 * - encoding: Set by user.
2609 * - decoding: unused
2611 int frame_skip_factor;
2614 * frame skip exponent
2615 * - encoding: Set by user.
2616 * - decoding: unused
2621 * frame skip comparison function
2622 * - encoding: Set by user.
2623 * - decoding: unused
2628 * trellis RD quantization
2629 * - encoding: Set by user.
2630 * - decoding: unused
2635 * - encoding: Set by user.
2636 * - decoding: unused
2638 int min_prediction_order;
2641 * - encoding: Set by user.
2642 * - decoding: unused
2644 int max_prediction_order;
2647 * GOP timecode frame start number
2648 * - encoding: Set by user, in non drop frame format
2649 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2651 int64_t timecode_frame_start;
2653 #if FF_API_RTP_CALLBACK
2655 * @deprecated unused
2657 /* The RTP callback: This function is called */
2658 /* every time the encoder has a packet to send. */
2659 /* It depends on the encoder if the data starts */
2660 /* with a Start Code (it should). H.263 does. */
2661 /* mb_nb contains the number of macroblocks */
2662 /* encoded in the RTP payload. */
2663 attribute_deprecated
2664 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2667 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2668 /* do its best to deliver a chunk with size */
2669 /* below rtp_payload_size, the chunk will start */
2670 /* with a start code on some codecs like H.263. */
2671 /* This doesn't take account of any particular */
2672 /* headers inside the transmitted RTP payload. */
2674 /* statistics, used for 2-pass encoding */
2685 * number of bits used for the previously encoded frame
2686 * - encoding: Set by libavcodec.
2687 * - decoding: unused
2692 * pass1 encoding statistics output buffer
2693 * - encoding: Set by libavcodec.
2694 * - decoding: unused
2699 * pass2 encoding statistics input buffer
2700 * Concatenated stuff from stats_out of pass1 should be placed here.
2701 * - encoding: Allocated/set/freed by user.
2702 * - decoding: unused
2707 * Work around bugs in encoders which sometimes cannot be detected automatically.
2708 * - encoding: Set by user
2709 * - decoding: Set by user
2711 int workaround_bugs;
2712 #define FF_BUG_AUTODETECT 1 ///< autodetection
2713 #if FF_API_OLD_MSMPEG4
2714 #define FF_BUG_OLD_MSMPEG4 2
2716 #define FF_BUG_XVID_ILACE 4
2717 #define FF_BUG_UMP4 8
2718 #define FF_BUG_NO_PADDING 16
2719 #define FF_BUG_AMV 32
2721 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2723 #define FF_BUG_QPEL_CHROMA 64
2724 #define FF_BUG_STD_QPEL 128
2725 #define FF_BUG_QPEL_CHROMA2 256
2726 #define FF_BUG_DIRECT_BLOCKSIZE 512
2727 #define FF_BUG_EDGE 1024
2728 #define FF_BUG_HPEL_CHROMA 2048
2729 #define FF_BUG_DC_CLIP 4096
2730 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2731 #define FF_BUG_TRUNCATED 16384
2734 * strictly follow the standard (MPEG4, ...).
2735 * - encoding: Set by user.
2736 * - decoding: Set by user.
2737 * Setting this to STRICT or higher means the encoder and decoder will
2738 * generally do stupid things, whereas setting it to unofficial or lower
2739 * will mean the encoder might produce output that is not supported by all
2740 * spec-compliant decoders. Decoders don't differentiate between normal,
2741 * unofficial and experimental (that is, they always try to decode things
2742 * when they can) unless they are explicitly asked to behave stupidly
2743 * (=strictly conform to the specs)
2745 int strict_std_compliance;
2746 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2747 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2748 #define FF_COMPLIANCE_NORMAL 0
2749 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2750 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2753 * error concealment flags
2754 * - encoding: unused
2755 * - decoding: Set by user.
2757 int error_concealment;
2758 #define FF_EC_GUESS_MVS 1
2759 #define FF_EC_DEBLOCK 2
2760 #define FF_EC_FAVOR_INTER 256
2764 * - encoding: Set by user.
2765 * - decoding: Set by user.
2768 #define FF_DEBUG_PICT_INFO 1
2769 #define FF_DEBUG_RC 2
2770 #define FF_DEBUG_BITSTREAM 4
2771 #define FF_DEBUG_MB_TYPE 8
2772 #define FF_DEBUG_QP 16
2775 * @deprecated this option does nothing
2777 #define FF_DEBUG_MV 32
2779 #define FF_DEBUG_DCT_COEFF 0x00000040
2780 #define FF_DEBUG_SKIP 0x00000080
2781 #define FF_DEBUG_STARTCODE 0x00000100
2782 #if FF_API_UNUSED_MEMBERS
2783 #define FF_DEBUG_PTS 0x00000200
2784 #endif /* FF_API_UNUSED_MEMBERS */
2785 #define FF_DEBUG_ER 0x00000400
2786 #define FF_DEBUG_MMCO 0x00000800
2787 #define FF_DEBUG_BUGS 0x00001000
2789 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2790 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2792 #define FF_DEBUG_BUFFERS 0x00008000
2793 #define FF_DEBUG_THREADS 0x00010000
2794 #define FF_DEBUG_GREEN_MD 0x00800000
2795 #define FF_DEBUG_NOMC 0x01000000
2800 * Code outside libavcodec should access this field using AVOptions
2801 * - encoding: Set by user.
2802 * - decoding: Set by user.
2805 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2806 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2807 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2811 * Error recognition; may misdetect some more or less valid parts as errors.
2812 * - encoding: unused
2813 * - decoding: Set by user.
2815 int err_recognition;
2818 * Verify checksums embedded in the bitstream (could be of either encoded or
2819 * decoded data, depending on the codec) and print an error message on mismatch.
2820 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2821 * decoder returning an error.
2823 #define AV_EF_CRCCHECK (1<<0)
2824 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2825 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2826 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2828 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2829 #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
2830 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2831 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2835 * opaque 64bit number (generally a PTS) that will be reordered and
2836 * output in AVFrame.reordered_opaque
2837 * - encoding: unused
2838 * - decoding: Set by user.
2840 int64_t reordered_opaque;
2843 * Hardware accelerator in use
2844 * - encoding: unused.
2845 * - decoding: Set by libavcodec
2847 struct AVHWAccel *hwaccel;
2850 * Hardware accelerator context.
2851 * For some hardware accelerators, a global context needs to be
2852 * provided by the user. In that case, this holds display-dependent
2853 * data FFmpeg cannot instantiate itself. Please refer to the
2854 * FFmpeg HW accelerator documentation to know how to fill this
2855 * is. e.g. for VA API, this is a struct vaapi_context.
2856 * - encoding: unused
2857 * - decoding: Set by user
2859 void *hwaccel_context;
2863 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2864 * - decoding: unused
2866 uint64_t error[AV_NUM_DATA_POINTERS];
2869 * DCT algorithm, see FF_DCT_* below
2870 * - encoding: Set by user.
2871 * - decoding: unused
2874 #define FF_DCT_AUTO 0
2875 #define FF_DCT_FASTINT 1
2876 #define FF_DCT_INT 2
2877 #define FF_DCT_MMX 3
2878 #define FF_DCT_ALTIVEC 5
2879 #define FF_DCT_FAAN 6
2882 * IDCT algorithm, see FF_IDCT_* below.
2883 * - encoding: Set by user.
2884 * - decoding: Set by user.
2887 #define FF_IDCT_AUTO 0
2888 #define FF_IDCT_INT 1
2889 #define FF_IDCT_SIMPLE 2
2890 #define FF_IDCT_SIMPLEMMX 3
2891 #define FF_IDCT_ARM 7
2892 #define FF_IDCT_ALTIVEC 8
2894 #define FF_IDCT_SH4 9
2896 #define FF_IDCT_SIMPLEARM 10
2897 #if FF_API_UNUSED_MEMBERS
2898 #define FF_IDCT_IPP 13
2899 #endif /* FF_API_UNUSED_MEMBERS */
2900 #define FF_IDCT_XVID 14
2901 #if FF_API_IDCT_XVIDMMX
2902 #define FF_IDCT_XVIDMMX 14
2903 #endif /* FF_API_IDCT_XVIDMMX */
2904 #define FF_IDCT_SIMPLEARMV5TE 16
2905 #define FF_IDCT_SIMPLEARMV6 17
2906 #if FF_API_ARCH_SPARC
2907 #define FF_IDCT_SIMPLEVIS 18
2909 #define FF_IDCT_FAAN 20
2910 #define FF_IDCT_SIMPLENEON 22
2911 #if FF_API_ARCH_ALPHA
2912 #define FF_IDCT_SIMPLEALPHA 23
2914 #define FF_IDCT_SIMPLEAUTO 128
2917 * bits per sample/pixel from the demuxer (needed for huffyuv).
2918 * - encoding: Set by libavcodec.
2919 * - decoding: Set by user.
2921 int bits_per_coded_sample;
2924 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2925 * - encoding: set by user.
2926 * - decoding: set by libavcodec.
2928 int bits_per_raw_sample;
2932 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2933 * - encoding: unused
2934 * - decoding: Set by user.
2935 * Code outside libavcodec should access this field using:
2936 * av_codec_{get,set}_lowres(avctx)
2941 #if FF_API_CODED_FRAME
2943 * the picture in the bitstream
2944 * - encoding: Set by libavcodec.
2945 * - decoding: unused
2947 * @deprecated use the quality factor packet side data instead
2949 attribute_deprecated AVFrame *coded_frame;
2954 * is used to decide how many independent tasks should be passed to execute()
2955 * - encoding: Set by user.
2956 * - decoding: Set by user.
2961 * Which multithreading methods to use.
2962 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2963 * so clients which cannot provide future frames should not use it.
2965 * - encoding: Set by user, otherwise the default is used.
2966 * - decoding: Set by user, otherwise the default is used.
2969 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2970 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2973 * Which multithreading methods are in use by the codec.
2974 * - encoding: Set by libavcodec.
2975 * - decoding: Set by libavcodec.
2977 int active_thread_type;
2980 * Set by the client if its custom get_buffer() callback can be called
2981 * synchronously from another thread, which allows faster multithreaded decoding.
2982 * draw_horiz_band() will be called from other threads regardless of this setting.
2983 * Ignored if the default get_buffer() is used.
2984 * - encoding: Set by user.
2985 * - decoding: Set by user.
2987 int thread_safe_callbacks;
2990 * The codec may call this to execute several independent things.
2991 * It will return only after finishing all tasks.
2992 * The user may replace this with some multithreaded implementation,
2993 * the default implementation will execute the parts serially.
2994 * @param count the number of things to execute
2995 * - encoding: Set by libavcodec, user can override.
2996 * - decoding: Set by libavcodec, user can override.
2998 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3001 * The codec may call this to execute several independent things.
3002 * It will return only after finishing all tasks.
3003 * The user may replace this with some multithreaded implementation,
3004 * the default implementation will execute the parts serially.
3005 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3006 * @param c context passed also to func
3007 * @param count the number of things to execute
3008 * @param arg2 argument passed unchanged to func
3009 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3010 * @param func function that will be called count times, with jobnr from 0 to count-1.
3011 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3012 * two instances of func executing at the same time will have the same threadnr.
3013 * @return always 0 currently, but code should handle a future improvement where when any call to func
3014 * returns < 0 no further calls to func may be done and < 0 is returned.
3015 * - encoding: Set by libavcodec, user can override.
3016 * - decoding: Set by libavcodec, user can override.
3018 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3021 * noise vs. sse weight for the nsse comparison function
3022 * - encoding: Set by user.
3023 * - decoding: unused
3029 * - encoding: Set by user.
3030 * - decoding: Set by libavcodec.
3033 #define FF_PROFILE_UNKNOWN -99
3034 #define FF_PROFILE_RESERVED -100
3036 #define FF_PROFILE_AAC_MAIN 0
3037 #define FF_PROFILE_AAC_LOW 1
3038 #define FF_PROFILE_AAC_SSR 2
3039 #define FF_PROFILE_AAC_LTP 3
3040 #define FF_PROFILE_AAC_HE 4
3041 #define FF_PROFILE_AAC_HE_V2 28
3042 #define FF_PROFILE_AAC_LD 22
3043 #define FF_PROFILE_AAC_ELD 38
3044 #define FF_PROFILE_MPEG2_AAC_LOW 128
3045 #define FF_PROFILE_MPEG2_AAC_HE 131
3047 #define FF_PROFILE_DTS 20
3048 #define FF_PROFILE_DTS_ES 30
3049 #define FF_PROFILE_DTS_96_24 40
3050 #define FF_PROFILE_DTS_HD_HRA 50
3051 #define FF_PROFILE_DTS_HD_MA 60
3052 #define FF_PROFILE_DTS_EXPRESS 70
3054 #define FF_PROFILE_MPEG2_422 0
3055 #define FF_PROFILE_MPEG2_HIGH 1
3056 #define FF_PROFILE_MPEG2_SS 2
3057 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3058 #define FF_PROFILE_MPEG2_MAIN 4
3059 #define FF_PROFILE_MPEG2_SIMPLE 5
3061 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3062 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3064 #define FF_PROFILE_H264_BASELINE 66
3065 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3066 #define FF_PROFILE_H264_MAIN 77
3067 #define FF_PROFILE_H264_EXTENDED 88
3068 #define FF_PROFILE_H264_HIGH 100
3069 #define FF_PROFILE_H264_HIGH_10 110
3070 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3071 #define FF_PROFILE_H264_HIGH_422 122
3072 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3073 #define FF_PROFILE_H264_HIGH_444 144
3074 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3075 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3076 #define FF_PROFILE_H264_CAVLC_444 44
3078 #define FF_PROFILE_VC1_SIMPLE 0
3079 #define FF_PROFILE_VC1_MAIN 1
3080 #define FF_PROFILE_VC1_COMPLEX 2
3081 #define FF_PROFILE_VC1_ADVANCED 3
3083 #define FF_PROFILE_MPEG4_SIMPLE 0
3084 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3085 #define FF_PROFILE_MPEG4_CORE 2
3086 #define FF_PROFILE_MPEG4_MAIN 3
3087 #define FF_PROFILE_MPEG4_N_BIT 4
3088 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3089 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3090 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3091 #define FF_PROFILE_MPEG4_HYBRID 8
3092 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3093 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3094 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3095 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3096 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3097 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3098 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3100 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3101 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3102 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3103 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3104 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3106 #define FF_PROFILE_VP9_0 0
3107 #define FF_PROFILE_VP9_1 1
3108 #define FF_PROFILE_VP9_2 2
3109 #define FF_PROFILE_VP9_3 3
3111 #define FF_PROFILE_HEVC_MAIN 1
3112 #define FF_PROFILE_HEVC_MAIN_10 2
3113 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3114 #define FF_PROFILE_HEVC_REXT 4
3118 * - encoding: Set by user.
3119 * - decoding: Set by libavcodec.
3122 #define FF_LEVEL_UNKNOWN -99
3125 * Skip loop filtering for selected frames.
3126 * - encoding: unused
3127 * - decoding: Set by user.
3129 enum AVDiscard skip_loop_filter;
3132 * Skip IDCT/dequantization for selected frames.
3133 * - encoding: unused
3134 * - decoding: Set by user.
3136 enum AVDiscard skip_idct;
3139 * Skip decoding for selected frames.
3140 * - encoding: unused
3141 * - decoding: Set by user.
3143 enum AVDiscard skip_frame;
3146 * Header containing style information for text subtitles.
3147 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3148 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3149 * the Format line following. It shouldn't include any Dialogue line.
3150 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3151 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3153 uint8_t *subtitle_header;
3154 int subtitle_header_size;
3156 #if FF_API_ERROR_RATE
3158 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3161 attribute_deprecated
3165 #if FF_API_VBV_DELAY
3167 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3168 * Used for compliant TS muxing.
3169 * - encoding: Set by libavcodec.
3170 * - decoding: unused.
3171 * @deprecated this value is now exported as a part of
3172 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3174 attribute_deprecated
3178 #if FF_API_SIDEDATA_ONLY_PKT
3180 * Encoding only and set by default. Allow encoders to output packets
3181 * that do not contain any encoded data, only side data.
3183 * Some encoders need to output such packets, e.g. to update some stream
3184 * parameters at the end of encoding.
3186 * @deprecated this field disables the default behaviour and
3187 * it is kept only for compatibility.
3189 attribute_deprecated
3190 int side_data_only_packets;
3194 * Audio only. The number of "priming" samples (padding) inserted by the
3195 * encoder at the beginning of the audio. I.e. this number of leading
3196 * decoded samples must be discarded by the caller to get the original audio
3197 * without leading padding.
3199 * - decoding: unused
3200 * - encoding: Set by libavcodec. The timestamps on the output packets are
3201 * adjusted by the encoder so that they always refer to the
3202 * first sample of the data actually contained in the packet,
3203 * including any added padding. E.g. if the timebase is
3204 * 1/samplerate and the timestamp of the first input sample is
3205 * 0, the timestamp of the first output packet will be
3208 int initial_padding;
3211 * - decoding: For codecs that store a framerate value in the compressed
3212 * bitstream, the decoder may export it here. { 0, 1} when
3214 * - encoding: unused
3216 AVRational framerate;
3219 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3220 * - encoding: unused.
3221 * - decoding: Set by libavcodec before calling get_format()
3223 enum AVPixelFormat sw_pix_fmt;
3226 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3227 * Code outside libavcodec should access this field using:
3228 * av_codec_{get,set}_pkt_timebase(avctx)
3229 * - encoding unused.
3230 * - decoding set by user.
3232 AVRational pkt_timebase;
3236 * Code outside libavcodec should access this field using:
3237 * av_codec_{get,set}_codec_descriptor(avctx)
3238 * - encoding: unused.
3239 * - decoding: set by libavcodec.
3241 const AVCodecDescriptor *codec_descriptor;
3245 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3246 * - encoding: unused
3247 * - decoding: Set by user.
3248 * Code outside libavcodec should access this field using:
3249 * av_codec_{get,set}_lowres(avctx)
3255 * Current statistics for PTS correction.
3256 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3257 * - encoding: unused
3259 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3260 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3261 int64_t pts_correction_last_pts; /// PTS of the last frame
3262 int64_t pts_correction_last_dts; /// DTS of the last frame
3265 * Character encoding of the input subtitles file.
3266 * - decoding: set by user
3267 * - encoding: unused
3272 * Subtitles character encoding mode. Formats or codecs might be adjusting
3273 * this setting (if they are doing the conversion themselves for instance).
3274 * - decoding: set by libavcodec
3275 * - encoding: unused
3277 int sub_charenc_mode;
3278 #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)
3279 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3280 #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
3283 * Skip processing alpha if supported by codec.
3284 * Note that if the format uses pre-multiplied alpha (common with VP6,
3285 * and recommended due to better video quality/compression)
3286 * the image will look as if alpha-blended onto a black background.
3287 * However for formats that do not use pre-multiplied alpha
3288 * there might be serious artefacts (though e.g. libswscale currently
3289 * assumes pre-multiplied alpha anyway).
3290 * Code outside libavcodec should access this field using AVOptions
3292 * - decoding: set by user
3293 * - encoding: unused
3298 * Number of samples to skip after a discontinuity
3299 * - decoding: unused
3300 * - encoding: set by libavcodec
3304 #if !FF_API_DEBUG_MV
3306 * debug motion vectors
3307 * Code outside libavcodec should access this field using AVOptions
3308 * - encoding: Set by user.
3309 * - decoding: Set by user.
3312 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3313 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3314 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3318 * custom intra quantization matrix
3319 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3320 * - encoding: Set by user, can be NULL.
3321 * - decoding: unused.
3323 uint16_t *chroma_intra_matrix;
3326 * dump format separator.
3327 * can be ", " or "\n " or anything else
3328 * Code outside libavcodec should access this field using AVOptions
3329 * (NO direct access).
3330 * - encoding: Set by user.
3331 * - decoding: Set by user.
3333 uint8_t *dump_separator;
3336 * ',' separated list of allowed decoders.
3337 * If NULL then all are allowed
3338 * - encoding: unused
3339 * - decoding: set by user through AVOPtions (NO direct access)
3341 char *codec_whitelist;
3344 * Properties of the stream that gets decoded
3345 * To be accessed through av_codec_get_properties() (NO direct access)
3346 * - encoding: unused
3347 * - decoding: set by libavcodec
3349 unsigned properties;
3350 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3351 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3354 * Additional data associated with the entire coded stream.
3356 * - decoding: unused
3357 * - encoding: may be set by libavcodec after avcodec_open2().
3359 AVPacketSideData *coded_side_data;
3360 int nb_coded_side_data;
3364 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3365 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3367 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3368 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3370 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3372 int av_codec_get_lowres(const AVCodecContext *avctx);
3373 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3375 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3376 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3378 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3379 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3384 typedef struct AVProfile {
3386 const char *name; ///< short name for the profile
3389 typedef struct AVCodecDefault AVCodecDefault;
3396 typedef struct AVCodec {
3398 * Name of the codec implementation.
3399 * The name is globally unique among encoders and among decoders (but an
3400 * encoder and a decoder can share the same name).
3401 * This is the primary way to find a codec from the user perspective.
3405 * Descriptive name for the codec, meant to be more human readable than name.
3406 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3408 const char *long_name;
3409 enum AVMediaType type;
3412 * Codec capabilities.
3413 * see AV_CODEC_CAP_*
3416 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3417 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3418 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3419 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3420 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3421 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3422 const AVClass *priv_class; ///< AVClass for the private context
3423 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3425 /*****************************************************************
3426 * No fields below this line are part of the public API. They
3427 * may not be used outside of libavcodec and can be changed and
3429 * New public fields should be added right above.
3430 *****************************************************************
3433 struct AVCodec *next;
3435 * @name Frame-level threading support functions
3439 * If defined, called on thread contexts when they are created.
3440 * If the codec allocates writable tables in init(), re-allocate them here.
3441 * priv_data will be set to a copy of the original.
3443 int (*init_thread_copy)(AVCodecContext *);
3445 * Copy necessary context variables from a previous thread context to the current one.
3446 * If not defined, the next thread will start automatically; otherwise, the codec
3447 * must call ff_thread_finish_setup().
3449 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3451 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3455 * Private codec-specific defaults.
3457 const AVCodecDefault *defaults;
3460 * Initialize codec static data, called from avcodec_register().
3462 void (*init_static_data)(struct AVCodec *codec);
3464 int (*init)(AVCodecContext *);
3465 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3466 const struct AVSubtitle *sub);
3468 * Encode data to an AVPacket.
3470 * @param avctx codec context
3471 * @param avpkt output AVPacket (may contain a user-provided buffer)
3472 * @param[in] frame AVFrame containing the raw data to be encoded
3473 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3474 * non-empty packet was returned in avpkt.
3475 * @return 0 on success, negative error code on failure
3477 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3478 int *got_packet_ptr);
3479 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3480 int (*close)(AVCodecContext *);
3483 * Will be called when seeking
3485 void (*flush)(AVCodecContext *);
3487 * Internal codec capabilities.
3488 * See FF_CODEC_CAP_* in internal.h
3493 int av_codec_get_max_lowres(const AVCodec *codec);
3495 struct MpegEncContext;
3498 * @defgroup lavc_hwaccel AVHWAccel
3501 typedef struct AVHWAccel {
3503 * Name of the hardware accelerated codec.
3504 * The name is globally unique among encoders and among decoders (but an
3505 * encoder and a decoder can share the same name).
3510 * Type of codec implemented by the hardware accelerator.
3512 * See AVMEDIA_TYPE_xxx
3514 enum AVMediaType type;
3517 * Codec implemented by the hardware accelerator.
3519 * See AV_CODEC_ID_xxx
3524 * Supported pixel format.
3526 * Only hardware accelerated formats are supported here.
3528 enum AVPixelFormat pix_fmt;
3531 * Hardware accelerated codec capabilities.
3532 * see HWACCEL_CODEC_CAP_*
3536 /*****************************************************************
3537 * No fields below this line are part of the public API. They
3538 * may not be used outside of libavcodec and can be changed and
3540 * New public fields should be added right above.
3541 *****************************************************************
3543 struct AVHWAccel *next;
3546 * Allocate a custom buffer
3548 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3551 * Called at the beginning of each frame or field picture.
3553 * Meaningful frame information (codec specific) is guaranteed to
3554 * be parsed at this point. This function is mandatory.
3556 * Note that buf can be NULL along with buf_size set to 0.
3557 * Otherwise, this means the whole frame is available at this point.
3559 * @param avctx the codec context
3560 * @param buf the frame data buffer base
3561 * @param buf_size the size of the frame in bytes
3562 * @return zero if successful, a negative value otherwise
3564 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3567 * Callback for each slice.
3569 * Meaningful slice information (codec specific) is guaranteed to
3570 * be parsed at this point. This function is mandatory.
3571 * The only exception is XvMC, that works on MB level.
3573 * @param avctx the codec context
3574 * @param buf the slice data buffer base
3575 * @param buf_size the size of the slice in bytes
3576 * @return zero if successful, a negative value otherwise
3578 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3581 * Called at the end of each frame or field picture.
3583 * The whole picture is parsed at this point and can now be sent
3584 * to the hardware accelerator. This function is mandatory.
3586 * @param avctx the codec context
3587 * @return zero if successful, a negative value otherwise
3589 int (*end_frame)(AVCodecContext *avctx);
3592 * Size of per-frame hardware accelerator private data.
3594 * Private data is allocated with av_mallocz() before
3595 * AVCodecContext.get_buffer() and deallocated after
3596 * AVCodecContext.release_buffer().
3598 int frame_priv_data_size;
3601 * Called for every Macroblock in a slice.
3603 * XvMC uses it to replace the ff_mpv_decode_mb().
3604 * Instead of decoding to raw picture, MB parameters are
3605 * stored in an array provided by the video driver.
3607 * @param s the mpeg context
3609 void (*decode_mb)(struct MpegEncContext *s);
3612 * Initialize the hwaccel private data.
3614 * This will be called from ff_get_format(), after hwaccel and
3615 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3618 int (*init)(AVCodecContext *avctx);
3621 * Uninitialize the hwaccel private data.
3623 * This will be called from get_format() or avcodec_close(), after hwaccel
3624 * and hwaccel_context are already uninitialized.
3626 int (*uninit)(AVCodecContext *avctx);
3629 * Size of the private data to allocate in
3630 * AVCodecInternal.hwaccel_priv_data.
3636 * Hardware acceleration should be used for decoding even if the codec level
3637 * used is unknown or higher than the maximum supported level reported by the
3640 * It's generally a good idea to pass this flag unless you have a specific
3641 * reason not to, as hardware tends to under-report supported levels.
3643 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3646 * Hardware acceleration can output YUV pixel formats with a different chroma
3647 * sampling than 4:2:0 and/or other than 8 bits per component.
3649 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3655 #if FF_API_AVPICTURE
3657 * @defgroup lavc_picture AVPicture
3659 * Functions for working with AVPicture
3664 * Picture data structure.
3666 * Up to four components can be stored into it, the last component is
3668 * @deprecated use AVFrame or imgutils functions instead
3670 typedef struct AVPicture {
3671 attribute_deprecated
3672 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3673 attribute_deprecated
3674 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3682 enum AVSubtitleType {
3685 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3688 * Plain text, the text field must be set by the decoder and is
3689 * authoritative. ass and pict fields may contain approximations.
3694 * Formatted text, the ass field must be set by the decoder and is
3695 * authoritative. pict and text fields may contain approximations.
3700 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3702 typedef struct AVSubtitleRect {
3703 int x; ///< top left corner of pict, undefined when pict is not set
3704 int y; ///< top left corner of pict, undefined when pict is not set
3705 int w; ///< width of pict, undefined when pict is not set
3706 int h; ///< height of pict, undefined when pict is not set
3707 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3709 #if FF_API_AVPICTURE
3711 * @deprecated unused
3713 attribute_deprecated
3717 * data+linesize for the bitmap of this subtitle.
3718 * Can be set for text/ass as well once they are rendered.
3723 enum AVSubtitleType type;
3725 char *text; ///< 0 terminated plain UTF-8 text
3728 * 0 terminated ASS/SSA compatible event line.
3729 * The presentation of this is unaffected by the other values in this
3737 typedef struct AVSubtitle {
3738 uint16_t format; /* 0 = graphics */
3739 uint32_t start_display_time; /* relative to packet pts, in ms */
3740 uint32_t end_display_time; /* relative to packet pts, in ms */
3742 AVSubtitleRect **rects;
3743 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3747 * If c is NULL, returns the first registered codec,
3748 * if c is non-NULL, returns the next registered codec after c,
3749 * or NULL if c is the last one.
3751 AVCodec *av_codec_next(const AVCodec *c);
3754 * Return the LIBAVCODEC_VERSION_INT constant.
3756 unsigned avcodec_version(void);
3759 * Return the libavcodec build-time configuration.
3761 const char *avcodec_configuration(void);
3764 * Return the libavcodec license.
3766 const char *avcodec_license(void);
3769 * Register the codec codec and initialize libavcodec.
3771 * @warning either this function or avcodec_register_all() must be called
3772 * before any other libavcodec functions.
3774 * @see avcodec_register_all()
3776 void avcodec_register(AVCodec *codec);
3779 * Register all the codecs, parsers and bitstream filters which were enabled at
3780 * configuration time. If you do not call this function you can select exactly
3781 * which formats you want to support, by using the individual registration
3784 * @see avcodec_register
3785 * @see av_register_codec_parser
3786 * @see av_register_bitstream_filter
3788 void avcodec_register_all(void);
3791 * Allocate an AVCodecContext and set its fields to default values. The
3792 * resulting struct should be freed with avcodec_free_context().
3794 * @param codec if non-NULL, allocate private data and initialize defaults
3795 * for the given codec. It is illegal to then call avcodec_open2()
3796 * with a different codec.
3797 * If NULL, then the codec-specific defaults won't be initialized,
3798 * which may result in suboptimal default settings (this is
3799 * important mainly for encoders, e.g. libx264).
3801 * @return An AVCodecContext filled with default values or NULL on failure.
3802 * @see avcodec_get_context_defaults
3804 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3807 * Free the codec context and everything associated with it and write NULL to
3808 * the provided pointer.
3810 void avcodec_free_context(AVCodecContext **avctx);
3813 * Set the fields of the given AVCodecContext to default values corresponding
3814 * to the given codec (defaults may be codec-dependent).
3816 * Do not call this function if a non-NULL codec has been passed
3817 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3818 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3819 * different codec on this AVCodecContext.
3821 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3824 * Get the AVClass for AVCodecContext. It can be used in combination with
3825 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3827 * @see av_opt_find().
3829 const AVClass *avcodec_get_class(void);
3832 * Get the AVClass for AVFrame. It can be used in combination with
3833 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3835 * @see av_opt_find().
3837 const AVClass *avcodec_get_frame_class(void);
3840 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3841 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3843 * @see av_opt_find().
3845 const AVClass *avcodec_get_subtitle_rect_class(void);
3848 * Copy the settings of the source AVCodecContext into the destination
3849 * AVCodecContext. The resulting destination codec context will be
3850 * unopened, i.e. you are required to call avcodec_open2() before you
3851 * can use this AVCodecContext to decode/encode video/audio data.
3853 * @param dest target codec context, should be initialized with
3854 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3855 * @param src source codec context
3856 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3858 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3861 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3862 * function the context has to be allocated with avcodec_alloc_context3().
3864 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3865 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3866 * retrieving a codec.
3868 * @warning This function is not thread safe!
3870 * @note Always call this function before using decoding routines (such as
3871 * @ref avcodec_decode_video2()).
3874 * avcodec_register_all();
3875 * av_dict_set(&opts, "b", "2.5M", 0);
3876 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3880 * context = avcodec_alloc_context3(codec);
3882 * if (avcodec_open2(context, codec, opts) < 0)
3886 * @param avctx The context to initialize.
3887 * @param codec The codec to open this context for. If a non-NULL codec has been
3888 * previously passed to avcodec_alloc_context3() or
3889 * avcodec_get_context_defaults3() for this context, then this
3890 * parameter MUST be either NULL or equal to the previously passed
3892 * @param options A dictionary filled with AVCodecContext and codec-private options.
3893 * On return this object will be filled with options that were not found.
3895 * @return zero on success, a negative value on error
3896 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3897 * av_dict_set(), av_opt_find().
3899 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3902 * Close a given AVCodecContext and free all the data associated with it
3903 * (but not the AVCodecContext itself).
3905 * Calling this function on an AVCodecContext that hasn't been opened will free
3906 * the codec-specific data allocated in avcodec_alloc_context3() /
3907 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3910 int avcodec_close(AVCodecContext *avctx);
3913 * Free all allocated data in the given subtitle struct.
3915 * @param sub AVSubtitle to free.
3917 void avsubtitle_free(AVSubtitle *sub);
3924 * @addtogroup lavc_packet
3929 * Allocate an AVPacket and set its fields to default values. The resulting
3930 * struct must be freed using av_packet_free().
3932 * @return An AVPacket filled with default values or NULL on failure.
3934 * @note this only allocates the AVPacket itself, not the data buffers. Those
3935 * must be allocated through other means such as av_new_packet.
3937 * @see av_new_packet
3939 AVPacket *av_packet_alloc(void);
3942 * Create a new packet that references the same data as src.
3944 * This is a shortcut for av_packet_alloc()+av_packet_ref().
3946 * @return newly created AVPacket on success, NULL on error.
3948 * @see av_packet_alloc
3949 * @see av_packet_ref
3951 AVPacket *av_packet_clone(AVPacket *src);
3954 * Free the packet, if the packet is reference counted, it will be
3955 * unreferenced first.
3957 * @param packet packet to be freed. The pointer will be set to NULL.
3958 * @note passing NULL is a no-op.
3960 void av_packet_free(AVPacket **pkt);
3963 * Initialize optional fields of a packet with default values.
3965 * Note, this does not touch the data and size members, which have to be
3966 * initialized separately.
3970 void av_init_packet(AVPacket *pkt);
3973 * Allocate the payload of a packet and initialize its fields with
3977 * @param size wanted payload size
3978 * @return 0 if OK, AVERROR_xxx otherwise
3980 int av_new_packet(AVPacket *pkt, int size);
3983 * Reduce packet size, correctly zeroing padding
3986 * @param size new size
3988 void av_shrink_packet(AVPacket *pkt, int size);
3991 * Increase packet size, correctly zeroing padding
3994 * @param grow_by number of bytes by which to increase the size of the packet
3996 int av_grow_packet(AVPacket *pkt, int grow_by);
3999 * Initialize a reference-counted packet from av_malloc()ed data.
4001 * @param pkt packet to be initialized. This function will set the data, size,
4002 * buf and destruct fields, all others are left untouched.
4003 * @param data Data allocated by av_malloc() to be used as packet data. If this
4004 * function returns successfully, the data is owned by the underlying AVBuffer.
4005 * The caller may not access the data through other means.
4006 * @param size size of data in bytes, without the padding. I.e. the full buffer
4007 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4009 * @return 0 on success, a negative AVERROR on error
4011 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4013 #if FF_API_AVPACKET_OLD_API
4015 * @warning This is a hack - the packet memory allocation stuff is broken. The
4016 * packet is allocated if it was not really allocated.
4018 * @deprecated Use av_packet_ref
4020 attribute_deprecated
4021 int av_dup_packet(AVPacket *pkt);
4023 * Copy packet, including contents
4025 * @return 0 on success, negative AVERROR on fail
4027 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4030 * Copy packet side data
4032 * @return 0 on success, negative AVERROR on fail
4034 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4039 * @deprecated Use av_packet_unref
4041 * @param pkt packet to free
4043 attribute_deprecated
4044 void av_free_packet(AVPacket *pkt);
4047 * Allocate new information of a packet.
4050 * @param type side information type
4051 * @param size side information size
4052 * @return pointer to fresh allocated data or NULL otherwise
4054 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4058 * Wrap an existing array as a packet side data.
4061 * @param type side information type
4062 * @param data the side data array. It must be allocated with the av_malloc()
4063 * family of functions. The ownership of the data is transferred to
4065 * @param size side information size
4066 * @return a non-negative number on success, a negative AVERROR code on
4067 * failure. On failure, the packet is unchanged and the data remains
4068 * owned by the caller.
4070 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4071 uint8_t *data, size_t size);
4074 * Shrink the already allocated side data buffer
4077 * @param type side information type
4078 * @param size new side information size
4079 * @return 0 on success, < 0 on failure
4081 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4085 * Get side information from packet.
4088 * @param type desired side information type
4089 * @param size pointer for side information size to store (optional)
4090 * @return pointer to data if present or NULL otherwise
4092 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4095 int av_packet_merge_side_data(AVPacket *pkt);
4097 int av_packet_split_side_data(AVPacket *pkt);
4099 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4102 * Pack a dictionary for use in side_data.
4104 * @param dict The dictionary to pack.
4105 * @param size pointer to store the size of the returned data
4106 * @return pointer to data if successful, NULL otherwise
4108 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4110 * Unpack a dictionary from side_data.
4112 * @param data data from side_data
4113 * @param size size of the data
4114 * @param dict the metadata storage dictionary
4115 * @return 0 on success, < 0 on failure
4117 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4121 * Convenience function to free all the side data stored.
4122 * All the other fields stay untouched.
4126 void av_packet_free_side_data(AVPacket *pkt);
4129 * Setup a new reference to the data described by a given packet
4131 * If src is reference-counted, setup dst as a new reference to the
4132 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4133 * data from src into it.
4135 * All the other fields are copied from src.
4137 * @see av_packet_unref
4139 * @param dst Destination packet
4140 * @param src Source packet
4142 * @return 0 on success, a negative AVERROR on error.
4144 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4149 * Unreference the buffer referenced by the packet and reset the
4150 * remaining packet fields to their default values.
4152 * @param pkt The packet to be unreferenced.
4154 void av_packet_unref(AVPacket *pkt);
4157 * Move every field in src to dst and reset src.
4159 * @see av_packet_unref
4161 * @param src Source packet, will be reset
4162 * @param dst Destination packet
4164 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4167 * Copy only "properties" fields from src to dst.
4169 * Properties for the purpose of this function are all the fields
4170 * beside those related to the packet data (buf, data, size)
4172 * @param dst Destination packet
4173 * @param src Source packet
4175 * @return 0 on success AVERROR on failure.
4178 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4181 * Convert valid timing fields (timestamps / durations) in a packet from one
4182 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4185 * @param pkt packet on which the conversion will be performed
4186 * @param tb_src source timebase, in which the timing fields in pkt are
4188 * @param tb_dst destination timebase, to which the timing fields will be
4191 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4198 * @addtogroup lavc_decoding
4203 * Find a registered decoder with a matching codec ID.
4205 * @param id AVCodecID of the requested decoder
4206 * @return A decoder if one was found, NULL otherwise.
4208 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4211 * Find a registered decoder with the specified name.
4213 * @param name name of the requested decoder
4214 * @return A decoder if one was found, NULL otherwise.
4216 AVCodec *avcodec_find_decoder_by_name(const char *name);
4219 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4220 * it can be called by custom get_buffer2() implementations for decoders without
4221 * AV_CODEC_CAP_DR1 set.
4223 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4227 * Return the amount of padding in pixels which the get_buffer callback must
4228 * provide around the edge of the image for codecs which do not have the
4229 * CODEC_FLAG_EMU_EDGE flag.
4231 * @return Required padding in pixels.
4233 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4236 attribute_deprecated
4237 unsigned avcodec_get_edge_width(void);
4241 * Modify width and height values so that they will result in a memory
4242 * buffer that is acceptable for the codec if you do not use any horizontal
4245 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4247 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4250 * Modify width and height values so that they will result in a memory
4251 * buffer that is acceptable for the codec if you also ensure that all
4252 * line sizes are a multiple of the respective linesize_align[i].
4254 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4256 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4257 int linesize_align[AV_NUM_DATA_POINTERS]);
4260 * Converts AVChromaLocation to swscale x/y chroma position.
4262 * The positions represent the chroma (0,0) position in a coordinates system
4263 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4265 * @param xpos horizontal chroma sample position
4266 * @param ypos vertical chroma sample position
4268 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4271 * Converts swscale x/y chroma position to AVChromaLocation.
4273 * The positions represent the chroma (0,0) position in a coordinates system
4274 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4276 * @param xpos horizontal chroma sample position
4277 * @param ypos vertical chroma sample position
4279 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4282 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4284 * Some decoders may support multiple frames in a single AVPacket. Such
4285 * decoders would then just decode the first frame and the return value would be
4286 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4287 * called again with an AVPacket containing the remaining data in order to
4288 * decode the second frame, etc... Even if no frames are returned, the packet
4289 * needs to be fed to the decoder with remaining data until it is completely
4290 * consumed or an error occurs.
4292 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4293 * and output. This means that for some packets they will not immediately
4294 * produce decoded output and need to be flushed at the end of decoding to get
4295 * all the decoded data. Flushing is done by calling this function with packets
4296 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4297 * returning samples. It is safe to flush even those decoders that are not
4298 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4300 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4301 * larger than the actual read bytes because some optimized bitstream
4302 * readers read 32 or 64 bits at once and could read over the end.
4304 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4305 * before packets may be fed to the decoder.
4307 * @param avctx the codec context
4308 * @param[out] frame The AVFrame in which to store decoded audio samples.
4309 * The decoder will allocate a buffer for the decoded frame by
4310 * calling the AVCodecContext.get_buffer2() callback.
4311 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4312 * reference counted and the returned reference belongs to the
4313 * caller. The caller must release the frame using av_frame_unref()
4314 * when the frame is no longer needed. The caller may safely write
4315 * to the frame if av_frame_is_writable() returns 1.
4316 * When AVCodecContext.refcounted_frames is set to 0, the returned
4317 * reference belongs to the decoder and is valid only until the
4318 * next call to this function or until closing or flushing the
4319 * decoder. The caller may not write to it.
4320 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4321 * non-zero. Note that this field being set to zero
4322 * does not mean that an error has occurred. For
4323 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4324 * call is guaranteed to produce a frame.
4325 * @param[in] avpkt The input AVPacket containing the input buffer.
4326 * At least avpkt->data and avpkt->size should be set. Some
4327 * decoders might also require additional fields to be set.
4328 * @return A negative error code is returned if an error occurred during
4329 * decoding, otherwise the number of bytes consumed from the input
4330 * AVPacket is returned.
4332 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4333 int *got_frame_ptr, const AVPacket *avpkt);
4336 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4337 * Some decoders may support multiple frames in a single AVPacket, such
4338 * decoders would then just decode the first frame.
4340 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4341 * the actual read bytes because some optimized bitstream readers read 32 or 64
4342 * bits at once and could read over the end.
4344 * @warning The end of the input buffer buf should be set to 0 to ensure that
4345 * no overreading happens for damaged MPEG streams.
4347 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4348 * between input and output, these need to be fed with avpkt->data=NULL,
4349 * avpkt->size=0 at the end to return the remaining frames.
4351 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4352 * before packets may be fed to the decoder.
4354 * @param avctx the codec context
4355 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4356 * Use av_frame_alloc() to get an AVFrame. The codec will
4357 * allocate memory for the actual bitmap by calling the
4358 * AVCodecContext.get_buffer2() callback.
4359 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4360 * reference counted and the returned reference belongs to the
4361 * caller. The caller must release the frame using av_frame_unref()
4362 * when the frame is no longer needed. The caller may safely write
4363 * to the frame if av_frame_is_writable() returns 1.
4364 * When AVCodecContext.refcounted_frames is set to 0, the returned
4365 * reference belongs to the decoder and is valid only until the
4366 * next call to this function or until closing or flushing the
4367 * decoder. The caller may not write to it.
4369 * @param[in] avpkt The input AVPacket containing the input buffer.
4370 * You can create such packet with av_init_packet() and by then setting
4371 * data and size, some decoders might in addition need other fields like
4372 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4374 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4375 * @return On error a negative value is returned, otherwise the number of bytes
4376 * used or zero if no frame could be decompressed.
4378 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4379 int *got_picture_ptr,
4380 const AVPacket *avpkt);
4383 * Decode a subtitle message.
4384 * Return a negative value on error, otherwise return the number of bytes used.
4385 * If no subtitle could be decompressed, got_sub_ptr is zero.
4386 * Otherwise, the subtitle is stored in *sub.
4387 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4388 * simplicity, because the performance difference is expect to be negligible
4389 * and reusing a get_buffer written for video codecs would probably perform badly
4390 * due to a potentially very different allocation pattern.
4392 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4393 * and output. This means that for some packets they will not immediately
4394 * produce decoded output and need to be flushed at the end of decoding to get
4395 * all the decoded data. Flushing is done by calling this function with packets
4396 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4397 * returning subtitles. It is safe to flush even those decoders that are not
4398 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4400 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4401 * before packets may be fed to the decoder.
4403 * @param avctx the codec context
4404 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4405 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4406 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4407 * @param[in] avpkt The input AVPacket containing the input buffer.
4409 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4414 * @defgroup lavc_parsing Frame parsing
4418 enum AVPictureStructure {
4419 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4420 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4421 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4422 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4425 typedef struct AVCodecParserContext {
4427 struct AVCodecParser *parser;
4428 int64_t frame_offset; /* offset of the current frame */
4429 int64_t cur_offset; /* current offset
4430 (incremented by each av_parser_parse()) */
4431 int64_t next_frame_offset; /* offset of the next frame */
4433 int pict_type; /* XXX: Put it back in AVCodecContext. */
4435 * This field is used for proper frame duration computation in lavf.
4436 * It signals, how much longer the frame duration of the current frame
4437 * is compared to normal frame duration.
4439 * frame_duration = (1 + repeat_pict) * time_base
4441 * It is used by codecs like H.264 to display telecined material.
4443 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4444 int64_t pts; /* pts of the current frame */
4445 int64_t dts; /* dts of the current frame */
4450 int fetch_timestamp;
4452 #define AV_PARSER_PTS_NB 4
4453 int cur_frame_start_index;
4454 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4455 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4456 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4459 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4460 #define PARSER_FLAG_ONCE 0x0002
4461 /// Set if the parser has a valid file offset
4462 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4463 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4465 int64_t offset; ///< byte offset from starting packet start
4466 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4469 * Set by parser to 1 for key frames and 0 for non-key frames.
4470 * It is initialized to -1, so if the parser doesn't set this flag,
4471 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4476 #if FF_API_CONVERGENCE_DURATION
4478 * @deprecated unused
4480 attribute_deprecated
4481 int64_t convergence_duration;
4484 // Timestamp generation support:
4486 * Synchronization point for start of timestamp generation.
4488 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4491 * For example, this corresponds to presence of H.264 buffering period
4497 * Offset of the current timestamp against last timestamp sync point in
4498 * units of AVCodecContext.time_base.
4500 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4501 * contain a valid timestamp offset.
4503 * Note that the timestamp of sync point has usually a nonzero
4504 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4505 * the next frame after timestamp sync point will be usually 1.
4507 * For example, this corresponds to H.264 cpb_removal_delay.
4509 int dts_ref_dts_delta;
4512 * Presentation delay of current frame in units of AVCodecContext.time_base.
4514 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4515 * contain valid non-negative timestamp delta (presentation time of a frame
4516 * must not lie in the past).
4518 * This delay represents the difference between decoding and presentation
4519 * time of the frame.
4521 * For example, this corresponds to H.264 dpb_output_delay.
4526 * Position of the packet in file.
4528 * Analogous to cur_frame_pts/dts
4530 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4533 * Byte position of currently parsed frame in stream.
4538 * Previous frame byte position.
4543 * Duration of the current frame.
4544 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4545 * For all other types, this is in units of AVCodecContext.time_base.
4549 enum AVFieldOrder field_order;
4552 * Indicate whether a picture is coded as a frame, top field or bottom field.
4554 * For example, H.264 field_pic_flag equal to 0 corresponds to
4555 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4556 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4557 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4559 enum AVPictureStructure picture_structure;
4562 * Picture number incremented in presentation or output order.
4563 * This field may be reinitialized at the first picture of a new sequence.
4565 * For example, this corresponds to H.264 PicOrderCnt.
4567 int output_picture_number;
4570 * Dimensions of the decoded video intended for presentation.
4576 * Dimensions of the coded video.
4582 * The format of the coded data, corresponds to enum AVPixelFormat for video
4583 * and for enum AVSampleFormat for audio.
4585 * Note that a decoder can have considerable freedom in how exactly it
4586 * decodes the data, so the format reported here might be different from the
4587 * one returned by a decoder.
4590 } AVCodecParserContext;
4592 typedef struct AVCodecParser {
4593 int codec_ids[5]; /* several codec IDs are permitted */
4595 int (*parser_init)(AVCodecParserContext *s);
4596 /* This callback never returns an error, a negative value means that
4597 * the frame start was in a previous packet. */
4598 int (*parser_parse)(AVCodecParserContext *s,
4599 AVCodecContext *avctx,
4600 const uint8_t **poutbuf, int *poutbuf_size,
4601 const uint8_t *buf, int buf_size);
4602 void (*parser_close)(AVCodecParserContext *s);
4603 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4604 struct AVCodecParser *next;
4607 AVCodecParser *av_parser_next(const AVCodecParser *c);
4609 void av_register_codec_parser(AVCodecParser *parser);
4610 AVCodecParserContext *av_parser_init(int codec_id);
4615 * @param s parser context.
4616 * @param avctx codec context.
4617 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4618 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4619 * @param buf input buffer.
4620 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4621 * @param pts input presentation timestamp.
4622 * @param dts input decoding timestamp.
4623 * @param pos input byte position in stream.
4624 * @return the number of bytes of the input bitstream used.
4629 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4636 * decode_frame(data, size);
4640 int av_parser_parse2(AVCodecParserContext *s,
4641 AVCodecContext *avctx,
4642 uint8_t **poutbuf, int *poutbuf_size,
4643 const uint8_t *buf, int buf_size,
4644 int64_t pts, int64_t dts,
4648 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4649 * @deprecated use AVBitStreamFilter
4651 int av_parser_change(AVCodecParserContext *s,
4652 AVCodecContext *avctx,
4653 uint8_t **poutbuf, int *poutbuf_size,
4654 const uint8_t *buf, int buf_size, int keyframe);
4655 void av_parser_close(AVCodecParserContext *s);
4663 * @addtogroup lavc_encoding
4668 * Find a registered encoder with a matching codec ID.
4670 * @param id AVCodecID of the requested encoder
4671 * @return An encoder if one was found, NULL otherwise.
4673 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4676 * Find a registered encoder with the specified name.
4678 * @param name name of the requested encoder
4679 * @return An encoder if one was found, NULL otherwise.
4681 AVCodec *avcodec_find_encoder_by_name(const char *name);
4684 * Encode a frame of audio.
4686 * Takes input samples from frame and writes the next output packet, if
4687 * available, to avpkt. The output packet does not necessarily contain data for
4688 * the most recent frame, as encoders can delay, split, and combine input frames
4689 * internally as needed.
4691 * @param avctx codec context
4692 * @param avpkt output AVPacket.
4693 * The user can supply an output buffer by setting
4694 * avpkt->data and avpkt->size prior to calling the
4695 * function, but if the size of the user-provided data is not
4696 * large enough, encoding will fail. If avpkt->data and
4697 * avpkt->size are set, avpkt->destruct must also be set. All
4698 * other AVPacket fields will be reset by the encoder using
4699 * av_init_packet(). If avpkt->data is NULL, the encoder will
4700 * allocate it. The encoder will set avpkt->size to the size
4701 * of the output packet.
4703 * If this function fails or produces no output, avpkt will be
4704 * freed using av_packet_unref().
4705 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4706 * May be NULL when flushing an encoder that has the
4707 * AV_CODEC_CAP_DELAY capability set.
4708 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4709 * can have any number of samples.
4710 * If it is not set, frame->nb_samples must be equal to
4711 * avctx->frame_size for all frames except the last.
4712 * The final frame may be smaller than avctx->frame_size.
4713 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4714 * output packet is non-empty, and to 0 if it is
4715 * empty. If the function returns an error, the
4716 * packet can be assumed to be invalid, and the
4717 * value of got_packet_ptr is undefined and should
4719 * @return 0 on success, negative error code on failure
4721 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4722 const AVFrame *frame, int *got_packet_ptr);
4725 * Encode a frame of video.
4727 * Takes input raw video data from frame and writes the next output packet, if
4728 * available, to avpkt. The output packet does not necessarily contain data for
4729 * the most recent frame, as encoders can delay and reorder input frames
4730 * internally as needed.
4732 * @param avctx codec context
4733 * @param avpkt output AVPacket.
4734 * The user can supply an output buffer by setting
4735 * avpkt->data and avpkt->size prior to calling the
4736 * function, but if the size of the user-provided data is not
4737 * large enough, encoding will fail. All other AVPacket fields
4738 * will be reset by the encoder using av_init_packet(). If
4739 * avpkt->data is NULL, the encoder will allocate it.
4740 * The encoder will set avpkt->size to the size of the
4741 * output packet. The returned data (if any) belongs to the
4742 * caller, he is responsible for freeing it.
4744 * If this function fails or produces no output, avpkt will be
4745 * freed using av_packet_unref().
4746 * @param[in] frame AVFrame containing the raw video data to be encoded.
4747 * May be NULL when flushing an encoder that has the
4748 * AV_CODEC_CAP_DELAY capability set.
4749 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4750 * output packet is non-empty, and to 0 if it is
4751 * empty. If the function returns an error, the
4752 * packet can be assumed to be invalid, and the
4753 * value of got_packet_ptr is undefined and should
4755 * @return 0 on success, negative error code on failure
4757 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4758 const AVFrame *frame, int *got_packet_ptr);
4760 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4761 const AVSubtitle *sub);
4768 #if FF_API_AVCODEC_RESAMPLE
4770 * @defgroup lavc_resample Audio resampling
4772 * @deprecated use libswresample instead
4776 struct ReSampleContext;
4777 struct AVResampleContext;
4779 typedef struct ReSampleContext ReSampleContext;
4782 * Initialize audio resampling context.
4784 * @param output_channels number of output channels
4785 * @param input_channels number of input channels
4786 * @param output_rate output sample rate
4787 * @param input_rate input sample rate
4788 * @param sample_fmt_out requested output sample format
4789 * @param sample_fmt_in input sample format
4790 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4791 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4792 * @param linear if 1 then the used FIR filter will be linearly interpolated
4793 between the 2 closest, if 0 the closest will be used
4794 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4795 * @return allocated ReSampleContext, NULL if error occurred
4797 attribute_deprecated
4798 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4799 int output_rate, int input_rate,
4800 enum AVSampleFormat sample_fmt_out,
4801 enum AVSampleFormat sample_fmt_in,
4802 int filter_length, int log2_phase_count,
4803 int linear, double cutoff);
4805 attribute_deprecated
4806 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4809 * Free resample context.
4811 * @param s a non-NULL pointer to a resample context previously
4812 * created with av_audio_resample_init()
4814 attribute_deprecated
4815 void audio_resample_close(ReSampleContext *s);
4819 * Initialize an audio resampler.
4820 * Note, if either rate is not an integer then simply scale both rates up so they are.
4821 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4822 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4823 * @param linear If 1 then the used FIR filter will be linearly interpolated
4824 between the 2 closest, if 0 the closest will be used
4825 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4827 attribute_deprecated
4828 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4831 * Resample an array of samples using a previously configured context.
4832 * @param src an array of unconsumed samples
4833 * @param consumed the number of samples of src which have been consumed are returned here
4834 * @param src_size the number of unconsumed samples available
4835 * @param dst_size the amount of space in samples available in dst
4836 * @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.
4837 * @return the number of samples written in dst or -1 if an error occurred
4839 attribute_deprecated
4840 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4844 * Compensate samplerate/timestamp drift. The compensation is done by changing
4845 * the resampler parameters, so no audible clicks or similar distortions occur
4846 * @param compensation_distance distance in output samples over which the compensation should be performed
4847 * @param sample_delta number of output samples which should be output less
4849 * example: av_resample_compensate(c, 10, 500)
4850 * here instead of 510 samples only 500 samples would be output
4852 * note, due to rounding the actual compensation might be slightly different,
4853 * especially if the compensation_distance is large and the in_rate used during init is small
4855 attribute_deprecated
4856 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4857 attribute_deprecated
4858 void av_resample_close(struct AVResampleContext *c);
4865 #if FF_API_AVPICTURE
4867 * @addtogroup lavc_picture
4872 * @deprecated unused
4874 attribute_deprecated
4875 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4878 * @deprecated unused
4880 attribute_deprecated
4881 void avpicture_free(AVPicture *picture);
4884 * @deprecated use av_image_fill_arrays() instead.
4886 attribute_deprecated
4887 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4888 enum AVPixelFormat pix_fmt, int width, int height);
4891 * @deprecated use av_image_copy_to_buffer() instead.
4893 attribute_deprecated
4894 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4895 int width, int height,
4896 unsigned char *dest, int dest_size);
4899 * @deprecated use av_image_get_buffer_size() instead.
4901 attribute_deprecated
4902 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4905 * @deprecated av_image_copy() instead.
4907 attribute_deprecated
4908 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4909 enum AVPixelFormat pix_fmt, int width, int height);
4912 * @deprecated unused
4914 attribute_deprecated
4915 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4916 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4919 * @deprecated unused
4921 attribute_deprecated
4922 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4923 int padtop, int padbottom, int padleft, int padright, int *color);
4931 * @defgroup lavc_misc Utility functions
4934 * Miscellaneous utility functions related to both encoding and decoding
4940 * @defgroup lavc_misc_pixfmt Pixel formats
4942 * Functions for working with pixel formats.
4947 * Utility function to access log2_chroma_w log2_chroma_h from
4948 * the pixel format AVPixFmtDescriptor.
4950 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4951 * for one that returns a failure code and continues in case of invalid
4954 * @param[in] pix_fmt the pixel format
4955 * @param[out] h_shift store log2_chroma_w
4956 * @param[out] v_shift store log2_chroma_h
4958 * @see av_pix_fmt_get_chroma_sub_sample
4961 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4964 * Return a value representing the fourCC code associated to the
4965 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4968 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4971 * @deprecated see av_get_pix_fmt_loss()
4973 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4977 * Find the best pixel format to convert to given a certain source pixel
4978 * format. When converting from one pixel format to another, information loss
4979 * may occur. For example, when converting from RGB24 to GRAY, the color
4980 * information will be lost. Similarly, other losses occur when converting from
4981 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4982 * the given pixel formats should be used to suffer the least amount of loss.
4983 * The pixel formats from which it chooses one, are determined by the
4984 * pix_fmt_list parameter.
4987 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4988 * @param[in] src_pix_fmt source pixel format
4989 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4990 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4991 * @return The best pixel format to convert to or -1 if none was found.
4993 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4994 enum AVPixelFormat src_pix_fmt,
4995 int has_alpha, int *loss_ptr);
4998 * @deprecated see av_find_best_pix_fmt_of_2()
5000 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5001 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5003 attribute_deprecated
5004 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
5005 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
5006 enum AVPixelFormat src_pix_fmt,
5007 int has_alpha, int *loss_ptr);
5009 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5010 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5014 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5020 #if FF_API_SET_DIMENSIONS
5022 * @deprecated this function is not supposed to be used from outside of lavc
5024 attribute_deprecated
5025 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
5029 * Put a string representing the codec tag codec_tag in buf.
5031 * @param buf buffer to place codec tag in
5032 * @param buf_size size in bytes of buf
5033 * @param codec_tag codec tag to assign
5034 * @return the length of the string that would have been generated if
5035 * enough space had been available, excluding the trailing null
5037 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5039 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5042 * Return a name for the specified profile, if available.
5044 * @param codec the codec that is searched for the given profile
5045 * @param profile the profile value for which a name is requested
5046 * @return A name for the profile if found, NULL otherwise.
5048 const char *av_get_profile_name(const AVCodec *codec, int profile);
5050 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5051 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5052 //FIXME func typedef
5055 * Fill AVFrame audio data and linesize pointers.
5057 * The buffer buf must be a preallocated buffer with a size big enough
5058 * to contain the specified samples amount. The filled AVFrame data
5059 * pointers will point to this buffer.
5061 * AVFrame extended_data channel pointers are allocated if necessary for
5064 * @param frame the AVFrame
5065 * frame->nb_samples must be set prior to calling the
5066 * function. This function fills in frame->data,
5067 * frame->extended_data, frame->linesize[0].
5068 * @param nb_channels channel count
5069 * @param sample_fmt sample format
5070 * @param buf buffer to use for frame data
5071 * @param buf_size size of buffer
5072 * @param align plane size sample alignment (0 = default)
5073 * @return >=0 on success, negative error code on failure
5074 * @todo return the size in bytes required to store the samples in
5075 * case of success, at the next libavutil bump
5077 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5078 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5079 int buf_size, int align);
5082 * Reset the internal decoder state / flush internal buffers. Should be called
5083 * e.g. when seeking or when switching to a different stream.
5085 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5086 * this invalidates the frames previously returned from the decoder. When
5087 * refcounted frames are used, the decoder just releases any references it might
5088 * keep internally, but the caller's reference remains valid.
5090 void avcodec_flush_buffers(AVCodecContext *avctx);
5093 * Return codec bits per sample.
5095 * @param[in] codec_id the codec
5096 * @return Number of bits per sample or zero if unknown for the given codec.
5098 int av_get_bits_per_sample(enum AVCodecID codec_id);
5101 * Return the PCM codec associated with a sample format.
5102 * @param be endianness, 0 for little, 1 for big,
5103 * -1 (or anything else) for native
5104 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5106 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5109 * Return codec bits per sample.
5110 * Only return non-zero if the bits per sample is exactly correct, not an
5113 * @param[in] codec_id the codec
5114 * @return Number of bits per sample or zero if unknown for the given codec.
5116 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5119 * Return audio frame duration.
5121 * @param avctx codec context
5122 * @param frame_bytes size of the frame, or 0 if unknown
5123 * @return frame duration, in samples, if known. 0 if not able to
5126 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5129 typedef struct AVBitStreamFilterContext {
5131 struct AVBitStreamFilter *filter;
5132 AVCodecParserContext *parser;
5133 struct AVBitStreamFilterContext *next;
5135 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5136 * Not for access by library users.
5139 } AVBitStreamFilterContext;
5142 typedef struct AVBitStreamFilter {
5145 int (*filter)(AVBitStreamFilterContext *bsfc,
5146 AVCodecContext *avctx, const char *args,
5147 uint8_t **poutbuf, int *poutbuf_size,
5148 const uint8_t *buf, int buf_size, int keyframe);
5149 void (*close)(AVBitStreamFilterContext *bsfc);
5150 struct AVBitStreamFilter *next;
5151 } AVBitStreamFilter;
5154 * Register a bitstream filter.
5156 * The filter will be accessible to the application code through
5157 * av_bitstream_filter_next() or can be directly initialized with
5158 * av_bitstream_filter_init().
5160 * @see avcodec_register_all()
5162 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5165 * Create and initialize a bitstream filter context given a bitstream
5168 * The returned context must be freed with av_bitstream_filter_close().
5170 * @param name the name of the bitstream filter
5171 * @return a bitstream filter context if a matching filter was found
5172 * and successfully initialized, NULL otherwise
5174 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5179 * This function filters the buffer buf with size buf_size, and places the
5180 * filtered buffer in the buffer pointed to by poutbuf.
5182 * The output buffer must be freed by the caller.
5184 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5185 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5186 * If specified, this must point to the encoder context of the
5187 * output stream the packet is sent to.
5188 * @param args arguments which specify the filter configuration, may be NULL
5189 * @param poutbuf pointer which is updated to point to the filtered buffer
5190 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5191 * @param buf buffer containing the data to filter
5192 * @param buf_size size in bytes of buf
5193 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5194 * @return >= 0 in case of success, or a negative error code in case of failure
5196 * If the return value is positive, an output buffer is allocated and
5197 * is available in *poutbuf, and is distinct from the input buffer.
5199 * If the return value is 0, the output buffer is not allocated and
5200 * should be considered identical to the input buffer, or in case
5201 * *poutbuf was set it points to the input buffer (not necessarily to
5202 * its starting address).
5204 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5205 AVCodecContext *avctx, const char *args,
5206 uint8_t **poutbuf, int *poutbuf_size,
5207 const uint8_t *buf, int buf_size, int keyframe);
5210 * Release bitstream filter context.
5212 * @param bsf the bitstream filter context created with
5213 * av_bitstream_filter_init(), can be NULL
5215 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5218 * If f is NULL, return the first registered bitstream filter,
5219 * if f is non-NULL, return the next registered bitstream filter
5220 * after f, or NULL if f is the last one.
5222 * This function can be used to iterate over all registered bitstream
5225 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5230 * Same behaviour av_fast_malloc but the buffer has additional
5231 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5233 * In addition the whole buffer will initially and after resizes
5234 * be 0-initialized so that no uninitialized data will ever appear.
5236 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5239 * Same behaviour av_fast_padded_malloc except that buffer will always
5240 * be 0-initialized after call.
5242 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5245 * Encode extradata length to a buffer. Used by xiph codecs.
5247 * @param s buffer to write to; must be at least (v/255+1) bytes long
5248 * @param v size of extradata in bytes
5249 * @return number of bytes written to the buffer.
5251 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5253 #if FF_API_MISSING_SAMPLE
5255 * Log a generic warning message about a missing feature. This function is
5256 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5257 * only, and would normally not be used by applications.
5258 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5259 * a pointer to an AVClass struct
5260 * @param[in] feature string containing the name of the missing feature
5261 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5262 * If want_sample is non-zero, additional verbage will be added to the log
5263 * message which tells the user how to report samples to the development
5265 * @deprecated Use avpriv_report_missing_feature() instead.
5267 attribute_deprecated
5268 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5271 * Log a generic warning message asking for a sample. This function is
5272 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5273 * only, and would normally not be used by applications.
5274 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5275 * a pointer to an AVClass struct
5276 * @param[in] msg string containing an optional message, or NULL if no message
5277 * @deprecated Use avpriv_request_sample() instead.
5279 attribute_deprecated
5280 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5281 #endif /* FF_API_MISSING_SAMPLE */
5284 * Register the hardware accelerator hwaccel.
5286 void av_register_hwaccel(AVHWAccel *hwaccel);
5289 * If hwaccel is NULL, returns the first registered hardware accelerator,
5290 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5291 * after hwaccel, or NULL if hwaccel is the last one.
5293 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5297 * Lock operation used by lockmgr
5300 AV_LOCK_CREATE, ///< Create a mutex
5301 AV_LOCK_OBTAIN, ///< Lock the mutex
5302 AV_LOCK_RELEASE, ///< Unlock the mutex
5303 AV_LOCK_DESTROY, ///< Free mutex resources
5307 * Register a user provided lock manager supporting the operations
5308 * specified by AVLockOp. The "mutex" argument to the function points
5309 * to a (void *) where the lockmgr should store/get a pointer to a user
5310 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5311 * value left by the last call for all other ops. If the lock manager is
5312 * unable to perform the op then it should leave the mutex in the same
5313 * state as when it was called and return a non-zero value. However,
5314 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5315 * have been successfully destroyed. If av_lockmgr_register succeeds
5316 * it will return a non-negative value, if it fails it will return a
5317 * negative value and destroy all mutex and unregister all callbacks.
5318 * av_lockmgr_register is not thread-safe, it must be called from a
5319 * single thread before any calls which make use of locking are used.
5321 * @param cb User defined callback. av_lockmgr_register invokes calls
5322 * to this callback and the previously registered callback.
5323 * The callback will be used to create more than one mutex
5324 * each of which must be backed by its own underlying locking
5325 * mechanism (i.e. do not use a single static object to
5326 * implement your lock manager). If cb is set to NULL the
5327 * lockmgr will be unregistered.
5329 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5332 * Get the type of the given codec.
5334 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5337 * Get the name of a codec.
5338 * @return a static string identifying the codec; never NULL
5340 const char *avcodec_get_name(enum AVCodecID id);
5343 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5344 * with no corresponding avcodec_close()), 0 otherwise.
5346 int avcodec_is_open(AVCodecContext *s);
5349 * @return a non-zero number if codec is an encoder, zero otherwise
5351 int av_codec_is_encoder(const AVCodec *codec);
5354 * @return a non-zero number if codec is a decoder, zero otherwise
5356 int av_codec_is_decoder(const AVCodec *codec);
5359 * @return descriptor for given codec ID or NULL if no descriptor exists.
5361 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5364 * Iterate over all codec descriptors known to libavcodec.
5366 * @param prev previous descriptor. NULL to get the first descriptor.
5368 * @return next descriptor or NULL after the last descriptor
5370 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5373 * @return codec descriptor with the given name or NULL if no such descriptor
5376 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5379 * Allocate a CPB properties structure and initialize its fields to default
5382 * @param size if non-NULL, the size of the allocated struct will be written
5383 * here. This is useful for embedding it in side data.
5385 * @return the newly allocated struct or NULL on failure
5387 AVCPBProperties *av_cpb_properties_alloc(size_t *size);
5393 #endif /* AVCODEC_AVCODEC_H */