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
76 * @defgroup lavc_core Core functions/structures.
79 * Basic definitions, functions for querying libavcodec capabilities,
80 * allocating core structures, etc.
86 * Identify the syntax and semantics of the bitstream.
87 * The principle is roughly:
88 * Two decoders with the same ID can decode the same streams.
89 * Two encoders with the same ID can encode compatible streams.
90 * There may be slight deviations from the principle due to implementation
93 * If you add a codec ID to this list, add it so that
94 * 1. no value of an existing codec ID changes (that would break ABI),
95 * 2. it is as close as possible to similar codecs
97 * After adding new codec IDs, do not forget to add an entry to the codec
98 * descriptor list and bump libavcodec minor version.
104 AV_CODEC_ID_MPEG1VIDEO,
105 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
107 AV_CODEC_ID_MPEG2VIDEO_XVMC,
108 #endif /* FF_API_XVMC */
119 AV_CODEC_ID_RAWVIDEO,
120 AV_CODEC_ID_MSMPEG4V1,
121 AV_CODEC_ID_MSMPEG4V2,
122 AV_CODEC_ID_MSMPEG4V3,
145 AV_CODEC_ID_INTERPLAY_VIDEO,
152 AV_CODEC_ID_MSVIDEO1,
157 AV_CODEC_ID_TRUEMOTION1,
158 AV_CODEC_ID_VMDVIDEO,
183 AV_CODEC_ID_TRUEMOTION2,
189 AV_CODEC_ID_SMACKVIDEO,
194 AV_CODEC_ID_JPEG2000,
200 AV_CODEC_ID_DSICINVIDEO,
201 AV_CODEC_ID_TIERTEXSEQVIDEO,
209 AV_CODEC_ID_BETHSOFTVID,
221 AV_CODEC_ID_ESCAPE124,
225 AV_CODEC_ID_MOTIONPIXELS,
237 AV_CODEC_ID_FLASHSV2,
238 AV_CODEC_ID_CDGRAPHICS,
241 AV_CODEC_ID_BINKVIDEO,
242 AV_CODEC_ID_IFF_ILBM,
243 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
249 AV_CODEC_ID_A64_MULTI,
250 AV_CODEC_ID_A64_MULTI5,
253 AV_CODEC_ID_LAGARITH,
257 AV_CODEC_ID_WMV3IMAGE,
258 AV_CODEC_ID_VC1IMAGE,
260 AV_CODEC_ID_BMV_VIDEO,
267 AV_CODEC_ID_ZEROCODEC,
276 AV_CODEC_ID_ESCAPE130,
279 AV_CODEC_ID_HNM4_VIDEO,
281 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
283 AV_CODEC_ID_ALIAS_PIX,
284 AV_CODEC_ID_BRENDER_PIX,
285 AV_CODEC_ID_PAF_VIDEO,
298 AV_CODEC_ID_SCREENPRESSO,
301 AV_CODEC_ID_Y41P = 0x8000,
306 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,
400 AV_CODEC_ID_ADPCM_IMA_DAT4,
403 AV_CODEC_ID_AMR_NB = 0x12000,
406 /* RealAudio codecs*/
407 AV_CODEC_ID_RA_144 = 0x13000,
410 /* various DPCM codecs */
411 AV_CODEC_ID_ROQ_DPCM = 0x14000,
412 AV_CODEC_ID_INTERPLAY_DPCM,
413 AV_CODEC_ID_XAN_DPCM,
414 AV_CODEC_ID_SOL_DPCM,
416 AV_CODEC_ID_SDX2_DPCM = 0x14800,
419 AV_CODEC_ID_MP2 = 0x15000,
420 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
430 AV_CODEC_ID_VMDAUDIO,
436 AV_CODEC_ID_WESTWOOD_SND1,
437 AV_CODEC_ID_GSM, ///< as in Berlin toast format
440 AV_CODEC_ID_TRUESPEECH,
442 AV_CODEC_ID_SMACKAUDIO,
445 AV_CODEC_ID_DSICINAUDIO,
447 AV_CODEC_ID_MUSEPACK7,
449 AV_CODEC_ID_GSM_MS, /* as found in WAV */
455 AV_CODEC_ID_NELLYMOSER,
456 AV_CODEC_ID_MUSEPACK8,
458 AV_CODEC_ID_WMAVOICE,
460 AV_CODEC_ID_WMALOSSLESS,
469 AV_CODEC_ID_BINKAUDIO_RDFT,
470 AV_CODEC_ID_BINKAUDIO_DCT,
471 AV_CODEC_ID_AAC_LATM,
476 AV_CODEC_ID_8SVX_EXP,
477 AV_CODEC_ID_8SVX_FIB,
478 AV_CODEC_ID_BMV_AUDIO,
483 AV_CODEC_ID_COMFORT_NOISE,
485 AV_CODEC_ID_METASOUND,
486 AV_CODEC_ID_PAF_AUDIO,
490 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
492 AV_CODEC_ID_SONIC_LS,
495 AV_CODEC_ID_DSD_LSBF,
496 AV_CODEC_ID_DSD_MSBF,
497 AV_CODEC_ID_DSD_LSBF_PLANAR,
498 AV_CODEC_ID_DSD_MSBF_PLANAR,
500 AV_CODEC_ID_INTERPLAY_ACM,
504 /* subtitle codecs */
505 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
506 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
507 AV_CODEC_ID_DVB_SUBTITLE,
508 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
511 AV_CODEC_ID_MOV_TEXT,
512 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
513 AV_CODEC_ID_DVB_TELETEXT,
516 AV_CODEC_ID_MICRODVD = 0x17800,
520 AV_CODEC_ID_REALTEXT,
522 AV_CODEC_ID_SUBVIEWER1,
523 AV_CODEC_ID_SUBVIEWER,
530 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
532 /* other specific kind of codecs (generally used for attachments) */
533 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
534 AV_CODEC_ID_TTF = 0x18000,
536 AV_CODEC_ID_BINTEXT = 0x18800,
540 AV_CODEC_ID_SMPTE_KLV,
542 AV_CODEC_ID_TIMED_ID3,
543 AV_CODEC_ID_BIN_DATA,
546 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
548 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
549 * stream (only used by libavformat) */
550 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
551 * stream (only used by libavformat) */
552 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
553 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
557 * This struct describes the properties of a single codec described by an
559 * @see avcodec_descriptor_get()
561 typedef struct AVCodecDescriptor {
563 enum AVMediaType type;
565 * Name of the codec described by this descriptor. It is non-empty and
566 * unique for each codec descriptor. It should contain alphanumeric
567 * characters and '_' only.
571 * A more descriptive name for this codec. May be NULL.
573 const char *long_name;
575 * 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;
585 * If non-NULL, an array of profiles recognized for this codec.
586 * Terminated with FF_PROFILE_UNKNOWN.
588 const struct AVProfile *profiles;
592 * Codec uses only intra compression.
595 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
597 * Codec supports lossy compression. Audio and video codecs only.
598 * @note a codec may support both lossy and lossless
601 #define AV_CODEC_PROP_LOSSY (1 << 1)
603 * Codec supports lossless compression. Audio and video codecs only.
605 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
607 * Codec supports frame reordering. That is, the coded order (the order in which
608 * the encoded packets are output by the encoders / stored / input to the
609 * decoders) may be different from the presentation order of the corresponding
612 * For codecs that do not have this property set, PTS and DTS should always be
615 #define AV_CODEC_PROP_REORDER (1 << 3)
617 * Subtitle codec is bitmap based
618 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
620 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
622 * Subtitle codec is text based.
623 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
625 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
628 * @ingroup lavc_decoding
629 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
630 * This is mainly needed because some optimized bitstream readers read
631 * 32 or 64 bit at once and could read over the end.<br>
632 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
633 * MPEG bitstreams could cause overread and segfault.
635 #define AV_INPUT_BUFFER_PADDING_SIZE 32
638 * @ingroup lavc_encoding
639 * minimum encoding buffer size
640 * Used to avoid some checks during header writing.
642 #define AV_INPUT_BUFFER_MIN_SIZE 16384
644 #if FF_API_WITHOUT_PREFIX
646 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
648 #define FF_INPUT_BUFFER_PADDING_SIZE 32
651 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
653 #define FF_MIN_BUFFER_SIZE 16384
654 #endif /* FF_API_WITHOUT_PREFIX */
657 * @ingroup lavc_encoding
658 * motion estimation type.
659 * @deprecated use codec private option instead
661 #if FF_API_MOTION_EST
663 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
667 ME_EPZS, ///< enhanced predictive zonal search
668 ME_X1, ///< reserved for experiments
669 ME_HEX, ///< hexagon based search
670 ME_UMH, ///< uneven multi-hexagon search
671 ME_TESA, ///< transformed exhaustive search algorithm
672 ME_ITER=50, ///< iterative search
677 * @ingroup lavc_decoding
680 /* We leave some space between them for extensions (drop some
681 * keyframes for intra-only or drop just some bidir frames). */
682 AVDISCARD_NONE =-16, ///< discard nothing
683 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
684 AVDISCARD_NONREF = 8, ///< discard all non reference
685 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
686 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
687 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
688 AVDISCARD_ALL = 48, ///< discard all
691 enum AVAudioServiceType {
692 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
693 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
694 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
695 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
696 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
697 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
698 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
699 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
700 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
701 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
705 * @ingroup lavc_encoding
707 typedef struct RcOverride{
710 int qscale; // If this is 0 then quality_factor will be used instead.
711 float quality_factor;
714 #if FF_API_MAX_BFRAMES
716 * @deprecated there is no libavcodec-wide limit on the number of B-frames
718 #define FF_MAX_B_FRAMES 16
722 These flags can be passed in AVCodecContext.flags before initialization.
723 Note: Not everything is supported yet.
727 * Allow decoders to produce frames with data planes that are not aligned
728 * to CPU requirements (e.g. due to cropping).
730 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
734 #define AV_CODEC_FLAG_QSCALE (1 << 1)
736 * 4 MV per MB allowed / advanced prediction for H.263.
738 #define AV_CODEC_FLAG_4MV (1 << 2)
740 * Output even those frames that might be corrupted.
742 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
746 #define AV_CODEC_FLAG_QPEL (1 << 4)
748 * Use internal 2pass ratecontrol in first pass mode.
750 #define AV_CODEC_FLAG_PASS1 (1 << 9)
752 * Use internal 2pass ratecontrol in second pass mode.
754 #define AV_CODEC_FLAG_PASS2 (1 << 10)
758 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
760 * Only decode/encode grayscale.
762 #define AV_CODEC_FLAG_GRAY (1 << 13)
764 * error[?] variables will be set during encoding.
766 #define AV_CODEC_FLAG_PSNR (1 << 15)
768 * Input bitstream might be truncated at a random location
769 * instead of only at frame boundaries.
771 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
773 * Use interlaced DCT.
775 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
779 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
781 * Place global headers in extradata instead of every keyframe.
783 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
785 * Use only bitexact stuff (except (I)DCT).
787 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
788 /* Fx : Flag for h263+ extra options */
790 * H.263 advanced intra coding / MPEG-4 AC prediction
792 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
794 * interlaced motion estimation
796 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
797 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
800 * Allow non spec compliant speedup tricks.
802 #define AV_CODEC_FLAG2_FAST (1 << 0)
804 * Skip bitstream encoding.
806 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
808 * Place global headers at every keyframe instead of in extradata.
810 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
813 * timecode is in drop frame format. DEPRECATED!!!!
815 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
818 * Input bitstream might be truncated at a packet boundaries
819 * instead of only at frame boundaries.
821 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
823 * Discard cropping information from SPS.
825 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
828 * Show all frames before the first keyframe
830 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
832 * Export motion vectors through frame side data
834 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
836 * Do not skip samples and export skip information as frame side data
838 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
840 * Do not reset ASS ReadOrder field on flush (subtitles decoding)
842 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
844 /* Unsupported options :
845 * Syntax Arithmetic coding (SAC)
846 * Reference Picture Selection
847 * Independent Segment Decoding */
849 /* codec capabilities */
852 * Decoder can use draw_horiz_band callback.
854 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
856 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
857 * If not set, it might not use get_buffer() at all or use operations that
858 * assume the buffer was allocated by avcodec_default_get_buffer.
860 #define AV_CODEC_CAP_DR1 (1 << 1)
861 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
863 * Encoder or decoder requires flushing with NULL input at the end in order to
864 * give the complete and correct output.
866 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
867 * with NULL data. The user can still send NULL data to the public encode
868 * or decode function, but libavcodec will not pass it along to the codec
869 * unless this flag is set.
872 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
873 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
877 * The encoder needs to be fed with NULL data at the end of encoding until the
878 * encoder no longer returns data.
880 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
881 * flag also means that the encoder must set the pts and duration for
882 * each output packet. If this flag is not set, the pts and duration will
883 * be determined by libavcodec from the input frame.
885 #define AV_CODEC_CAP_DELAY (1 << 5)
887 * Codec can be fed a final frame with a smaller size.
888 * This can be used to prevent truncation of the last audio samples.
890 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
894 * Codec can export data for HW decoding (VDPAU).
896 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
900 * Codec can output multiple frames per AVPacket
901 * Normally demuxers return one frame at a time, demuxers which do not do
902 * are connected to a parser to split what they return into proper frames.
903 * This flag is reserved to the very rare category of codecs which have a
904 * bitstream that cannot be split into frames without timeconsuming
905 * operations like full decoding. Demuxers carring such bitstreams thus
906 * may return multiple frames in a packet. This has many disadvantages like
907 * prohibiting stream copy in many cases thus it should only be considered
910 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
912 * Codec is experimental and is thus avoided in favor of non experimental
915 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
917 * Codec should fill in channel configuration and samplerate instead of container
919 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
921 * Codec supports frame-level multithreading.
923 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
925 * Codec supports slice-based (or partition-based) multithreading.
927 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
929 * Codec supports changed parameters at any point.
931 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
933 * Codec supports avctx->thread_count == 0 (auto).
935 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
937 * Audio encoder supports receiving a different number of samples in each call.
939 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
941 * Codec is intra only.
943 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
947 #define AV_CODEC_CAP_LOSSLESS 0x80000000
950 #if FF_API_WITHOUT_PREFIX
952 * Allow decoders to produce frames with data planes that are not aligned
953 * to CPU requirements (e.g. due to cropping).
955 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
956 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
957 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
958 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
959 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
962 * @deprecated use the "gmc" private option of the libxvid encoder
964 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
968 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
971 #define CODEC_FLAG_MV0 0x0040
973 #if FF_API_INPUT_PRESERVED
975 * @deprecated passing reference-counted frames to the encoders replaces this
978 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
980 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
981 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
982 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
985 * @deprecated edges are not used/required anymore. I.e. this flag is now always
988 #define CODEC_FLAG_EMU_EDGE 0x4000
990 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
991 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
993 #if FF_API_NORMALIZE_AQP
995 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
998 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
1000 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
1001 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
1002 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
1003 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
1004 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
1005 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
1006 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
1007 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
1008 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1009 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1010 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1011 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1012 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1014 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1015 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1016 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1017 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1019 /* Unsupported options :
1020 * Syntax Arithmetic coding (SAC)
1021 * Reference Picture Selection
1022 * Independent Segment Decoding */
1024 /* codec capabilities */
1026 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1028 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1029 * If not set, it might not use get_buffer() at all or use operations that
1030 * assume the buffer was allocated by avcodec_default_get_buffer.
1032 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1033 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1035 /* Codec can export data for HW decoding. This flag indicates that
1036 * the codec would call get_format() with list that might contain HW accelerated
1037 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1038 * including raw image format.
1039 * The application can use the passed context to determine bitstream version,
1040 * chroma format, resolution etc.
1042 #define CODEC_CAP_HWACCEL 0x0010
1043 #endif /* FF_API_XVMC */
1045 * Encoder or decoder requires flushing with NULL input at the end in order to
1046 * give the complete and correct output.
1048 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1049 * with NULL data. The user can still send NULL data to the public encode
1050 * or decode function, but libavcodec will not pass it along to the codec
1051 * unless this flag is set.
1054 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1055 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1059 * The encoder needs to be fed with NULL data at the end of encoding until the
1060 * encoder no longer returns data.
1062 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1063 * flag also means that the encoder must set the pts and duration for
1064 * each output packet. If this flag is not set, the pts and duration will
1065 * be determined by libavcodec from the input frame.
1067 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1069 * Codec can be fed a final frame with a smaller size.
1070 * This can be used to prevent truncation of the last audio samples.
1072 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1073 #if FF_API_CAP_VDPAU
1075 * Codec can export data for HW decoding (VDPAU).
1077 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1080 * Codec can output multiple frames per AVPacket
1081 * Normally demuxers return one frame at a time, demuxers which do not do
1082 * are connected to a parser to split what they return into proper frames.
1083 * This flag is reserved to the very rare category of codecs which have a
1084 * bitstream that cannot be split into frames without timeconsuming
1085 * operations like full decoding. Demuxers carring such bitstreams thus
1086 * may return multiple frames in a packet. This has many disadvantages like
1087 * prohibiting stream copy in many cases thus it should only be considered
1090 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1092 * Codec is experimental and is thus avoided in favor of non experimental
1095 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1097 * Codec should fill in channel configuration and samplerate instead of container
1099 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1100 #if FF_API_NEG_LINESIZES
1102 * @deprecated no codecs use this capability
1104 #define CODEC_CAP_NEG_LINESIZES 0x0800
1107 * Codec supports frame-level multithreading.
1109 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1111 * Codec supports slice-based (or partition-based) multithreading.
1113 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1115 * Codec supports changed parameters at any point.
1117 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1119 * Codec supports avctx->thread_count == 0 (auto).
1121 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1123 * Audio encoder supports receiving a different number of samples in each call.
1125 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1127 * Codec is intra only.
1129 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1131 * Codec is lossless.
1133 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1136 * HWAccel is experimental and is thus avoided in favor of non experimental
1139 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1140 #endif /* FF_API_WITHOUT_PREFIX */
1143 //The following defines may change, don't expect compatibility if you use them.
1144 #define MB_TYPE_INTRA4x4 0x0001
1145 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1146 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1147 #define MB_TYPE_16x16 0x0008
1148 #define MB_TYPE_16x8 0x0010
1149 #define MB_TYPE_8x16 0x0020
1150 #define MB_TYPE_8x8 0x0040
1151 #define MB_TYPE_INTERLACED 0x0080
1152 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1153 #define MB_TYPE_ACPRED 0x0200
1154 #define MB_TYPE_GMC 0x0400
1155 #define MB_TYPE_SKIP 0x0800
1156 #define MB_TYPE_P0L0 0x1000
1157 #define MB_TYPE_P1L0 0x2000
1158 #define MB_TYPE_P0L1 0x4000
1159 #define MB_TYPE_P1L1 0x8000
1160 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1161 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1162 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1163 #define MB_TYPE_QUANT 0x00010000
1164 #define MB_TYPE_CBP 0x00020000
1165 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1170 * This specifies the area which should be displayed.
1171 * Note there may be multiple such areas for one frame.
1173 typedef struct AVPanScan{
1176 * - encoding: Set by user.
1177 * - decoding: Set by libavcodec.
1182 * width and height in 1/16 pel
1183 * - encoding: Set by user.
1184 * - decoding: Set by libavcodec.
1190 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1191 * - encoding: Set by user.
1192 * - decoding: Set by libavcodec.
1194 int16_t position[3][2];
1198 * This structure describes the bitrate properties of an encoded bitstream. It
1199 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1200 * parameters for H.264/HEVC.
1202 typedef struct AVCPBProperties {
1204 * Maximum bitrate of the stream, in bits per second.
1205 * Zero if unknown or unspecified.
1209 * Minimum bitrate of the stream, in bits per second.
1210 * Zero if unknown or unspecified.
1214 * Average bitrate of the stream, in bits per second.
1215 * Zero if unknown or unspecified.
1220 * The size of the buffer to which the ratecontrol is applied, in bits.
1221 * Zero if unknown or unspecified.
1226 * The delay between the time the packet this structure is associated with
1227 * is received and the time when it should be decoded, in periods of a 27MHz
1230 * UINT64_MAX when unknown or unspecified.
1235 #if FF_API_QSCALE_TYPE
1236 #define FF_QSCALE_TYPE_MPEG1 0
1237 #define FF_QSCALE_TYPE_MPEG2 1
1238 #define FF_QSCALE_TYPE_H264 2
1239 #define FF_QSCALE_TYPE_VP56 3
1243 * The decoder will keep a reference to the frame and may reuse it later.
1245 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1248 * @defgroup lavc_packet AVPacket
1250 * Types and functions for working with AVPacket.
1253 enum AVPacketSideDataType {
1254 AV_PKT_DATA_PALETTE,
1255 AV_PKT_DATA_NEW_EXTRADATA,
1258 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1261 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1262 * s32le channel_count
1263 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1264 * u64le channel_layout
1265 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1267 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1272 AV_PKT_DATA_PARAM_CHANGE,
1275 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1276 * structures with info about macroblocks relevant to splitting the
1277 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1278 * That is, it does not necessarily contain info about all macroblocks,
1279 * as long as the distance between macroblocks in the info is smaller
1280 * than the target payload size.
1281 * Each MB info structure is 12 bytes, and is laid out as follows:
1283 * u32le bit offset from the start of the packet
1284 * u8 current quantizer at the start of the macroblock
1286 * u16le macroblock address within the GOB
1287 * u8 horizontal MV predictor
1288 * u8 vertical MV predictor
1289 * u8 horizontal MV predictor for block number 3
1290 * u8 vertical MV predictor for block number 3
1293 AV_PKT_DATA_H263_MB_INFO,
1296 * This side data should be associated with an audio stream and contains
1297 * ReplayGain information in form of the AVReplayGain struct.
1299 AV_PKT_DATA_REPLAYGAIN,
1302 * This side data contains a 3x3 transformation matrix describing an affine
1303 * transformation that needs to be applied to the decoded video frames for
1304 * correct presentation.
1306 * See libavutil/display.h for a detailed description of the data.
1308 AV_PKT_DATA_DISPLAYMATRIX,
1311 * This side data should be associated with a video stream and contains
1312 * Stereoscopic 3D information in form of the AVStereo3D struct.
1314 AV_PKT_DATA_STEREO3D,
1317 * This side data should be associated with an audio stream and corresponds
1318 * to enum AVAudioServiceType.
1320 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1323 * This side data contains quality related information from the encoder.
1325 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1329 * u64le[error count] sum of squared differences between encoder in and output
1332 AV_PKT_DATA_QUALITY_STATS,
1335 * This side data contains an integer value representing the stream index
1336 * of a "fallback" track. A fallback track indicates an alternate
1337 * track to use when the current track can not be decoded for some reason.
1338 * e.g. no decoder available for codec.
1340 AV_PKT_DATA_FALLBACK_TRACK,
1343 * This side data corresponds to the AVCPBProperties struct.
1345 AV_PKT_DATA_CPB_PROPERTIES,
1348 * Recommmends skipping the specified number of samples
1350 * u32le number of samples to skip from start of this packet
1351 * u32le number of samples to skip from end of this packet
1352 * u8 reason for start skip
1353 * u8 reason for end skip (0=padding silence, 1=convergence)
1356 AV_PKT_DATA_SKIP_SAMPLES=70,
1359 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1360 * the packet may contain "dual mono" audio specific to Japanese DTV
1361 * and if it is true, recommends only the selected channel to be used.
1363 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1366 AV_PKT_DATA_JP_DUALMONO,
1369 * A list of zero terminated key/value strings. There is no end marker for
1370 * the list, so it is required to rely on the side data size to stop.
1372 AV_PKT_DATA_STRINGS_METADATA,
1375 * Subtitle event position
1383 AV_PKT_DATA_SUBTITLE_POSITION,
1386 * Data found in BlockAdditional element of matroska container. There is
1387 * no end marker for the data, so it is required to rely on the side data
1388 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1391 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1394 * The optional first identifier line of a WebVTT cue.
1396 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1399 * The optional settings (rendering instructions) that immediately
1400 * follow the timestamp specifier of a WebVTT cue.
1402 AV_PKT_DATA_WEBVTT_SETTINGS,
1405 * A list of zero terminated key/value strings. There is no end marker for
1406 * the list, so it is required to rely on the side data size to stop. This
1407 * side data includes updated metadata which appeared in the stream.
1409 AV_PKT_DATA_METADATA_UPDATE,
1412 * MPEGTS stream ID, this is required to pass the stream ID
1413 * information from the demuxer to the corresponding muxer.
1415 AV_PKT_DATA_MPEGTS_STREAM_ID,
1418 * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1419 * should be associated with a video stream and containts data in the form
1420 * of the AVMasteringDisplayMetadata struct.
1422 AV_PKT_DATA_MASTERING_DISPLAY_METADATA
1425 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1427 typedef struct AVPacketSideData {
1430 enum AVPacketSideDataType type;
1434 * This structure stores compressed data. It is typically exported by demuxers
1435 * and then passed as input to decoders, or received as output from encoders and
1436 * then passed to muxers.
1438 * For video, it should typically contain one compressed frame. For audio it may
1439 * contain several compressed frames. Encoders are allowed to output empty
1440 * packets, with no compressed data, containing only side data
1441 * (e.g. to update some stream parameters at the end of encoding).
1443 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1444 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1445 * without libavcodec and libavformat major bump.
1447 * The semantics of data ownership depends on the buf field.
1448 * If it is set, the packet data is dynamically allocated and is
1449 * valid indefinitely until a call to av_packet_unref() reduces the
1450 * reference count to 0.
1452 * If the buf field is not set av_packet_ref() would make a copy instead
1453 * of increasing the reference count.
1455 * The side data is always allocated with av_malloc(), copied by
1456 * av_packet_ref() and freed by av_packet_unref().
1458 * @see av_packet_ref
1459 * @see av_packet_unref
1461 typedef struct AVPacket {
1463 * A reference to the reference-counted buffer where the packet data is
1465 * May be NULL, then the packet data is not reference-counted.
1469 * Presentation timestamp in AVStream->time_base units; the time at which
1470 * the decompressed packet will be presented to the user.
1471 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1472 * pts MUST be larger or equal to dts as presentation cannot happen before
1473 * decompression, unless one wants to view hex dumps. Some formats misuse
1474 * the terms dts and pts/cts to mean something different. Such timestamps
1475 * must be converted to true pts/dts before they are stored in AVPacket.
1479 * Decompression timestamp in AVStream->time_base units; the time at which
1480 * the packet is decompressed.
1481 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1488 * A combination of AV_PKT_FLAG values
1492 * Additional packet data that can be provided by the container.
1493 * Packet can contain several types of side information.
1495 AVPacketSideData *side_data;
1496 int side_data_elems;
1499 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1500 * Equals next_pts - this_pts in presentation order.
1504 int64_t pos; ///< byte position in stream, -1 if unknown
1506 #if FF_API_CONVERGENCE_DURATION
1508 * @deprecated Same as the duration field, but as int64_t. This was required
1509 * for Matroska subtitles, whose duration values could overflow when the
1510 * duration field was still an int.
1512 attribute_deprecated
1513 int64_t convergence_duration;
1516 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1517 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1519 enum AVSideDataParamChangeFlags {
1520 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1521 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1522 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1523 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1529 struct AVCodecInternal;
1533 AV_FIELD_PROGRESSIVE,
1534 AV_FIELD_TT, //< Top coded_first, top displayed first
1535 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1536 AV_FIELD_TB, //< Top coded first, bottom displayed first
1537 AV_FIELD_BT, //< Bottom coded first, top displayed first
1541 * main external API structure.
1542 * New fields can be added to the end with minor version bumps.
1543 * Removal, reordering and changes to existing fields require a major
1545 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1547 * sizeof(AVCodecContext) must not be used outside libav*.
1549 typedef struct AVCodecContext {
1551 * information on struct for av_log
1552 * - set by avcodec_alloc_context3
1554 const AVClass *av_class;
1555 int log_level_offset;
1557 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1558 const struct AVCodec *codec;
1559 #if FF_API_CODEC_NAME
1561 * @deprecated this field is not used for anything in libavcodec
1563 attribute_deprecated
1564 char codec_name[32];
1566 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1569 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1570 * This is used to work around some encoder bugs.
1571 * A demuxer should set this to what is stored in the field used to identify the codec.
1572 * If there are multiple such fields in a container then the demuxer should choose the one
1573 * which maximizes the information about the used codec.
1574 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1575 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1576 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1578 * - encoding: Set by user, if not then the default based on codec_id will be used.
1579 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1581 unsigned int codec_tag;
1583 #if FF_API_STREAM_CODEC_TAG
1585 * @deprecated this field is unused
1587 attribute_deprecated
1588 unsigned int stream_codec_tag;
1594 * Private context used for internal data.
1596 * Unlike priv_data, this is not codec-specific. It is used in general
1597 * libavcodec functions.
1599 struct AVCodecInternal *internal;
1602 * Private data of the user, can be used to carry app specific stuff.
1603 * - encoding: Set by user.
1604 * - decoding: Set by user.
1609 * the average bitrate
1610 * - encoding: Set by user; unused for constant quantizer encoding.
1611 * - decoding: Set by user, may be overwritten by libavcodec
1612 * if this info is available in the stream
1617 * number of bits the bitstream is allowed to diverge from the reference.
1618 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1619 * - encoding: Set by user; unused for constant quantizer encoding.
1620 * - decoding: unused
1622 int bit_rate_tolerance;
1625 * Global quality for codecs which cannot change it per frame.
1626 * This should be proportional to MPEG-1/2/4 qscale.
1627 * - encoding: Set by user.
1628 * - decoding: unused
1633 * - encoding: Set by user.
1634 * - decoding: unused
1636 int compression_level;
1637 #define FF_COMPRESSION_DEFAULT -1
1641 * - encoding: Set by user.
1642 * - decoding: Set by user.
1648 * - encoding: Set by user.
1649 * - decoding: Set by user.
1654 * some codecs need / can use extradata like Huffman tables.
1655 * mjpeg: Huffman tables
1656 * rv10: additional flags
1657 * mpeg4: global headers (they can be in the bitstream or here)
1658 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1659 * than extradata_size to avoid problems if it is read with the bitstream reader.
1660 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1661 * - encoding: Set/allocated/freed by libavcodec.
1662 * - decoding: Set/allocated/freed by user.
1668 * This is the fundamental unit of time (in seconds) in terms
1669 * of which frame timestamps are represented. For fixed-fps content,
1670 * timebase should be 1/framerate and timestamp increments should be
1672 * This often, but not always is the inverse of the frame rate or field rate
1673 * for video. 1/time_base is not the average frame rate if the frame rate is not
1676 * Like containers, elementary streams also can store timestamps, 1/time_base
1677 * is the unit in which these timestamps are specified.
1678 * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1679 * vop_time_increment_resolution and fixed_vop_rate
1680 * (fixed_vop_rate == 0 implies that it is different from the framerate)
1682 * - encoding: MUST be set by user.
1683 * - decoding: the use of this field for decoding is deprecated.
1684 * Use framerate instead.
1686 AVRational time_base;
1689 * For some codecs, the time base is closer to the field rate than the frame rate.
1690 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1691 * if no telecine is used ...
1693 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1695 int ticks_per_frame;
1700 * Encoding: Number of frames delay there will be from the encoder input to
1701 * the decoder output. (we assume the decoder matches the spec)
1702 * Decoding: Number of frames delay in addition to what a standard decoder
1703 * as specified in the spec would produce.
1706 * Number of frames the decoded output will be delayed relative to the
1710 * For encoding, this field is unused (see initial_padding).
1712 * For decoding, this is the number of samples the decoder needs to
1713 * output before the decoder's output is valid. When seeking, you should
1714 * start decoding this many samples prior to your desired seek point.
1716 * - encoding: Set by libavcodec.
1717 * - decoding: Set by libavcodec.
1724 * picture width / height.
1726 * @note Those fields may not match the values of the last
1727 * AVFrame outputted by avcodec_decode_video2 due frame
1730 * - encoding: MUST be set by user.
1731 * - decoding: May be set by the user before opening the decoder if known e.g.
1732 * from the container. Some decoders will require the dimensions
1733 * to be set by the caller. During decoding, the decoder may
1734 * overwrite those values as required while parsing the data.
1739 * Bitstream width / height, may be different from width/height e.g. when
1740 * the decoded frame is cropped before being output or lowres is enabled.
1742 * @note Those field may not match the value of the last
1743 * AVFrame outputted by avcodec_decode_video2 due frame
1746 * - encoding: unused
1747 * - decoding: May be set by the user before opening the decoder if known
1748 * e.g. from the container. During decoding, the decoder may
1749 * overwrite those values as required while parsing the data.
1751 int coded_width, coded_height;
1753 #if FF_API_ASPECT_EXTENDED
1754 #define FF_ASPECT_EXTENDED 15
1758 * the number of pictures in a group of pictures, or 0 for intra_only
1759 * - encoding: Set by user.
1760 * - decoding: unused
1765 * Pixel format, see AV_PIX_FMT_xxx.
1766 * May be set by the demuxer if known from headers.
1767 * May be overridden by the decoder if it knows better.
1769 * @note This field may not match the value of the last
1770 * AVFrame outputted by avcodec_decode_video2 due frame
1773 * - encoding: Set by user.
1774 * - decoding: Set by user if known, overridden by libavcodec while
1777 enum AVPixelFormat pix_fmt;
1779 #if FF_API_MOTION_EST
1781 * This option does nothing
1782 * @deprecated use codec private options instead
1784 attribute_deprecated int me_method;
1788 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1789 * decoder to draw a horizontal band. It improves cache usage. Not
1790 * all codecs can do that. You must check the codec capabilities
1792 * When multithreading is used, it may be called from multiple threads
1793 * at the same time; threads might draw different parts of the same AVFrame,
1794 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1796 * The function is also used by hardware acceleration APIs.
1797 * It is called at least once during frame decoding to pass
1798 * the data needed for hardware render.
1799 * In that mode instead of pixel data, AVFrame points to
1800 * a structure specific to the acceleration API. The application
1801 * reads the structure and can change some fields to indicate progress
1803 * - encoding: unused
1804 * - decoding: Set by user.
1805 * @param height the height of the slice
1806 * @param y the y position of the slice
1807 * @param type 1->top field, 2->bottom field, 3->frame
1808 * @param offset offset into the AVFrame.data from which the slice should be read
1810 void (*draw_horiz_band)(struct AVCodecContext *s,
1811 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1812 int y, int type, int height);
1815 * callback to negotiate the pixelFormat
1816 * @param fmt is the list of formats which are supported by the codec,
1817 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1818 * The first is always the native one.
1819 * @note The callback may be called again immediately if initialization for
1820 * the selected (hardware-accelerated) pixel format failed.
1821 * @warning Behavior is undefined if the callback returns a value not
1822 * in the fmt list of formats.
1823 * @return the chosen format
1824 * - encoding: unused
1825 * - decoding: Set by user, if not set the native format will be chosen.
1827 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1830 * maximum number of B-frames between non-B-frames
1831 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1832 * - encoding: Set by user.
1833 * - decoding: unused
1838 * qscale factor between IP and B-frames
1839 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1840 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1841 * - encoding: Set by user.
1842 * - decoding: unused
1844 float b_quant_factor;
1846 #if FF_API_RC_STRATEGY
1847 /** @deprecated use codec private option instead */
1848 attribute_deprecated int rc_strategy;
1849 #define FF_RC_STRATEGY_XVID 1
1852 #if FF_API_PRIVATE_OPT
1853 /** @deprecated use encoder private options instead */
1854 attribute_deprecated
1855 int b_frame_strategy;
1859 * qscale offset between IP and B-frames
1860 * - encoding: Set by user.
1861 * - decoding: unused
1863 float b_quant_offset;
1866 * Size of the frame reordering buffer in the decoder.
1867 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1868 * - encoding: Set by libavcodec.
1869 * - decoding: Set by libavcodec.
1873 #if FF_API_PRIVATE_OPT
1874 /** @deprecated use encoder private options instead */
1875 attribute_deprecated
1880 * qscale factor between P and I-frames
1881 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1882 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1883 * - encoding: Set by user.
1884 * - decoding: unused
1886 float i_quant_factor;
1889 * qscale offset between P and I-frames
1890 * - encoding: Set by user.
1891 * - decoding: unused
1893 float i_quant_offset;
1896 * luminance masking (0-> disabled)
1897 * - encoding: Set by user.
1898 * - decoding: unused
1903 * temporary complexity masking (0-> disabled)
1904 * - encoding: Set by user.
1905 * - decoding: unused
1907 float temporal_cplx_masking;
1910 * spatial complexity masking (0-> disabled)
1911 * - encoding: Set by user.
1912 * - decoding: unused
1914 float spatial_cplx_masking;
1917 * p block masking (0-> disabled)
1918 * - encoding: Set by user.
1919 * - decoding: unused
1924 * darkness masking (0-> disabled)
1925 * - encoding: Set by user.
1926 * - decoding: unused
1932 * - encoding: Set by libavcodec.
1933 * - decoding: Set by user (or 0).
1937 #if FF_API_PRIVATE_OPT
1938 /** @deprecated use encoder private options instead */
1939 attribute_deprecated
1940 int prediction_method;
1941 #define FF_PRED_LEFT 0
1942 #define FF_PRED_PLANE 1
1943 #define FF_PRED_MEDIAN 2
1947 * slice offsets in the frame in bytes
1948 * - encoding: Set/allocated by libavcodec.
1949 * - decoding: Set/allocated by user (or NULL).
1954 * sample aspect ratio (0 if unknown)
1955 * That is the width of a pixel divided by the height of the pixel.
1956 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1957 * - encoding: Set by user.
1958 * - decoding: Set by libavcodec.
1960 AVRational sample_aspect_ratio;
1963 * motion estimation comparison function
1964 * - encoding: Set by user.
1965 * - decoding: unused
1969 * subpixel motion estimation comparison function
1970 * - encoding: Set by user.
1971 * - decoding: unused
1975 * macroblock comparison function (not supported yet)
1976 * - encoding: Set by user.
1977 * - decoding: unused
1981 * interlaced DCT comparison function
1982 * - encoding: Set by user.
1983 * - decoding: unused
1986 #define FF_CMP_SAD 0
1987 #define FF_CMP_SSE 1
1988 #define FF_CMP_SATD 2
1989 #define FF_CMP_DCT 3
1990 #define FF_CMP_PSNR 4
1991 #define FF_CMP_BIT 5
1993 #define FF_CMP_ZERO 7
1994 #define FF_CMP_VSAD 8
1995 #define FF_CMP_VSSE 9
1996 #define FF_CMP_NSSE 10
1997 #define FF_CMP_W53 11
1998 #define FF_CMP_W97 12
1999 #define FF_CMP_DCTMAX 13
2000 #define FF_CMP_DCT264 14
2001 #define FF_CMP_CHROMA 256
2004 * ME diamond size & shape
2005 * - encoding: Set by user.
2006 * - decoding: unused
2011 * amount of previous MV predictors (2a+1 x 2a+1 square)
2012 * - encoding: Set by user.
2013 * - decoding: unused
2015 int last_predictor_count;
2017 #if FF_API_PRIVATE_OPT
2018 /** @deprecated use encoder private options instead */
2019 attribute_deprecated
2024 * motion estimation prepass comparison function
2025 * - encoding: Set by user.
2026 * - decoding: unused
2031 * ME prepass diamond size & shape
2032 * - encoding: Set by user.
2033 * - decoding: unused
2039 * - encoding: Set by user.
2040 * - decoding: unused
2042 int me_subpel_quality;
2046 * DTG active format information (additional aspect ratio
2047 * information only used in DVB MPEG-2 transport streams)
2050 * - encoding: unused
2051 * - decoding: Set by decoder.
2052 * @deprecated Deprecated in favor of AVSideData
2054 attribute_deprecated int dtg_active_format;
2055 #define FF_DTG_AFD_SAME 8
2056 #define FF_DTG_AFD_4_3 9
2057 #define FF_DTG_AFD_16_9 10
2058 #define FF_DTG_AFD_14_9 11
2059 #define FF_DTG_AFD_4_3_SP_14_9 13
2060 #define FF_DTG_AFD_16_9_SP_14_9 14
2061 #define FF_DTG_AFD_SP_4_3 15
2062 #endif /* FF_API_AFD */
2065 * maximum motion estimation search range in subpel units
2066 * If 0 then no limit.
2068 * - encoding: Set by user.
2069 * - decoding: unused
2073 #if FF_API_QUANT_BIAS
2075 * @deprecated use encoder private option instead
2077 attribute_deprecated int intra_quant_bias;
2078 #define FF_DEFAULT_QUANT_BIAS 999999
2081 * @deprecated use encoder private option instead
2083 attribute_deprecated int inter_quant_bias;
2088 * - encoding: unused
2089 * - decoding: Set by user.
2092 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2093 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2094 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2098 * XVideo Motion Acceleration
2099 * - encoding: forbidden
2100 * - decoding: set by decoder
2101 * @deprecated XvMC doesn't need it anymore.
2103 attribute_deprecated int xvmc_acceleration;
2104 #endif /* FF_API_XVMC */
2107 * macroblock decision mode
2108 * - encoding: Set by user.
2109 * - decoding: unused
2112 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2113 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2114 #define FF_MB_DECISION_RD 2 ///< rate distortion
2117 * custom intra quantization matrix
2118 * - encoding: Set by user, can be NULL.
2119 * - decoding: Set by libavcodec.
2121 uint16_t *intra_matrix;
2124 * custom inter quantization matrix
2125 * - encoding: Set by user, can be NULL.
2126 * - decoding: Set by libavcodec.
2128 uint16_t *inter_matrix;
2130 #if FF_API_PRIVATE_OPT
2131 /** @deprecated use encoder private options instead */
2132 attribute_deprecated
2133 int scenechange_threshold;
2135 /** @deprecated use encoder private options instead */
2136 attribute_deprecated
2137 int noise_reduction;
2142 * @deprecated this field is unused
2144 attribute_deprecated
2148 * @deprecated this field is unused
2150 attribute_deprecated
2155 * precision of the intra DC coefficient - 8
2156 * - encoding: Set by user.
2157 * - decoding: Set by libavcodec
2159 int intra_dc_precision;
2162 * Number of macroblock rows at the top which are skipped.
2163 * - encoding: unused
2164 * - decoding: Set by user.
2169 * Number of macroblock rows at the bottom which are skipped.
2170 * - encoding: unused
2171 * - decoding: Set by user.
2177 * @deprecated use encoder private options instead
2179 attribute_deprecated
2180 float border_masking;
2184 * minimum MB lagrange multipler
2185 * - encoding: Set by user.
2186 * - decoding: unused
2191 * maximum MB lagrange multipler
2192 * - encoding: Set by user.
2193 * - decoding: unused
2197 #if FF_API_PRIVATE_OPT
2199 * @deprecated use encoder private options instead
2201 attribute_deprecated
2202 int me_penalty_compensation;
2206 * - encoding: Set by user.
2207 * - decoding: unused
2211 #if FF_API_PRIVATE_OPT
2212 /** @deprecated use encoder private options instead */
2213 attribute_deprecated
2219 * - encoding: Set by user.
2220 * - decoding: unused
2225 * number of reference frames
2226 * - encoding: Set by user.
2227 * - decoding: Set by lavc.
2231 #if FF_API_PRIVATE_OPT
2232 /** @deprecated use encoder private options instead */
2233 attribute_deprecated
2237 #if FF_API_UNUSED_MEMBERS
2239 * Multiplied by qscale for each frame and added to scene_change_score.
2240 * - encoding: Set by user.
2241 * - decoding: unused
2243 attribute_deprecated int scenechange_factor;
2247 * Note: Value depends upon the compare function used for fullpel ME.
2248 * - encoding: Set by user.
2249 * - decoding: unused
2253 #if FF_API_PRIVATE_OPT
2254 /** @deprecated use encoder private options instead */
2255 attribute_deprecated
2260 * Chromaticity coordinates of the source primaries.
2261 * - encoding: Set by user
2262 * - decoding: Set by libavcodec
2264 enum AVColorPrimaries color_primaries;
2267 * Color Transfer Characteristic.
2268 * - encoding: Set by user
2269 * - decoding: Set by libavcodec
2271 enum AVColorTransferCharacteristic color_trc;
2274 * YUV colorspace type.
2275 * - encoding: Set by user
2276 * - decoding: Set by libavcodec
2278 enum AVColorSpace colorspace;
2281 * MPEG vs JPEG YUV range.
2282 * - encoding: Set by user
2283 * - decoding: Set by libavcodec
2285 enum AVColorRange color_range;
2288 * This defines the location of chroma samples.
2289 * - encoding: Set by user
2290 * - decoding: Set by libavcodec
2292 enum AVChromaLocation chroma_sample_location;
2296 * Indicates number of picture subdivisions. Used for parallelized
2298 * - encoding: Set by user
2299 * - decoding: unused
2304 * - encoding: set by libavcodec
2305 * - decoding: Set by user.
2307 enum AVFieldOrder field_order;
2310 int sample_rate; ///< samples per second
2311 int channels; ///< number of audio channels
2314 * audio sample format
2315 * - encoding: Set by user.
2316 * - decoding: Set by libavcodec.
2318 enum AVSampleFormat sample_fmt; ///< sample format
2320 /* The following data should not be initialized. */
2322 * Number of samples per channel in an audio frame.
2324 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2325 * except the last must contain exactly frame_size samples per channel.
2326 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2327 * frame size is not restricted.
2328 * - decoding: may be set by some decoders to indicate constant frame size
2333 * Frame counter, set by libavcodec.
2335 * - decoding: total number of frames returned from the decoder so far.
2336 * - encoding: total number of frames passed to the encoder so far.
2338 * @note the counter is not incremented if encoding/decoding resulted in
2344 * number of bytes per packet if constant and known or 0
2345 * Used by some WAV based audio codecs.
2350 * Audio cutoff bandwidth (0 means "automatic")
2351 * - encoding: Set by user.
2352 * - decoding: unused
2357 * Audio channel layout.
2358 * - encoding: set by user.
2359 * - decoding: set by user, may be overwritten by libavcodec.
2361 uint64_t channel_layout;
2364 * Request decoder to use this channel layout if it can (0 for default)
2365 * - encoding: unused
2366 * - decoding: Set by user.
2368 uint64_t request_channel_layout;
2371 * Type of service that the audio stream conveys.
2372 * - encoding: Set by user.
2373 * - decoding: Set by libavcodec.
2375 enum AVAudioServiceType audio_service_type;
2378 * desired sample format
2379 * - encoding: Not used.
2380 * - decoding: Set by user.
2381 * Decoder will decode to this format if it can.
2383 enum AVSampleFormat request_sample_fmt;
2386 * This callback is called at the beginning of each frame to get data
2387 * buffer(s) for it. There may be one contiguous buffer for all the data or
2388 * there may be a buffer per each data plane or anything in between. What
2389 * this means is, you may set however many entries in buf[] you feel necessary.
2390 * Each buffer must be reference-counted using the AVBuffer API (see description
2393 * The following fields will be set in the frame before this callback is
2396 * - width, height (video only)
2397 * - sample_rate, channel_layout, nb_samples (audio only)
2398 * Their values may differ from the corresponding values in
2399 * AVCodecContext. This callback must use the frame values, not the codec
2400 * context values, to calculate the required buffer size.
2402 * This callback must fill the following fields in the frame:
2406 * * if the data is planar audio with more than 8 channels, then this
2407 * callback must allocate and fill extended_data to contain all pointers
2408 * to all data planes. data[] must hold as many pointers as it can.
2409 * extended_data must be allocated with av_malloc() and will be freed in
2411 * * otherwise exended_data must point to data
2412 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2413 * the frame's data and extended_data pointers must be contained in these. That
2414 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2415 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2416 * and av_buffer_ref().
2417 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2418 * this callback and filled with the extra buffers if there are more
2419 * buffers than buf[] can hold. extended_buf will be freed in
2422 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2423 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2426 * Each data plane must be aligned to the maximum required by the target
2429 * @see avcodec_default_get_buffer2()
2433 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2434 * (read and/or written to if it is writable) later by libavcodec.
2436 * avcodec_align_dimensions2() should be used to find the required width and
2437 * height, as they normally need to be rounded up to the next multiple of 16.
2439 * Some decoders do not support linesizes changing between frames.
2441 * If frame multithreading is used and thread_safe_callbacks is set,
2442 * this callback may be called from a different thread, but not from more
2443 * than one at once. Does not need to be reentrant.
2445 * @see avcodec_align_dimensions2()
2449 * Decoders request a buffer of a particular size by setting
2450 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2451 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2452 * to a smaller value in the output frame.
2454 * As a convenience, av_samples_get_buffer_size() and
2455 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2456 * functions to find the required data size and to fill data pointers and
2457 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2458 * since all planes must be the same size.
2460 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2462 * - encoding: unused
2463 * - decoding: Set by libavcodec, user can override.
2465 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2468 * If non-zero, the decoded audio and video frames returned from
2469 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2470 * and are valid indefinitely. The caller must free them with
2471 * av_frame_unref() when they are not needed anymore.
2472 * Otherwise, the decoded frames must not be freed by the caller and are
2473 * only valid until the next decode call.
2475 * - encoding: unused
2476 * - decoding: set by the caller before avcodec_open2().
2478 int refcounted_frames;
2480 /* - encoding parameters */
2481 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2482 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2486 * - encoding: Set by user.
2487 * - decoding: unused
2493 * - encoding: Set by user.
2494 * - decoding: unused
2499 * maximum quantizer difference between frames
2500 * - encoding: Set by user.
2501 * - decoding: unused
2507 * @deprecated use encoder private options instead
2509 attribute_deprecated
2512 attribute_deprecated
2514 attribute_deprecated
2519 * decoder bitstream buffer size
2520 * - encoding: Set by user.
2521 * - decoding: unused
2526 * ratecontrol override, see RcOverride
2527 * - encoding: Allocated/set/freed by user.
2528 * - decoding: unused
2530 int rc_override_count;
2531 RcOverride *rc_override;
2535 * @deprecated use encoder private options instead
2537 attribute_deprecated
2543 * - encoding: Set by user.
2544 * - decoding: Set by user, may be overwritten by libavcodec.
2546 int64_t rc_max_rate;
2550 * - encoding: Set by user.
2551 * - decoding: unused
2553 int64_t rc_min_rate;
2557 * @deprecated use encoder private options instead
2559 attribute_deprecated
2560 float rc_buffer_aggressivity;
2562 attribute_deprecated
2563 float rc_initial_cplx;
2567 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2568 * - encoding: Set by user.
2569 * - decoding: unused.
2571 float rc_max_available_vbv_use;
2574 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2575 * - encoding: Set by user.
2576 * - decoding: unused.
2578 float rc_min_vbv_overflow_use;
2581 * Number of bits which should be loaded into the rc buffer before decoding starts.
2582 * - encoding: Set by user.
2583 * - decoding: unused
2585 int rc_initial_buffer_occupancy;
2587 #if FF_API_CODER_TYPE
2588 #define FF_CODER_TYPE_VLC 0
2589 #define FF_CODER_TYPE_AC 1
2590 #define FF_CODER_TYPE_RAW 2
2591 #define FF_CODER_TYPE_RLE 3
2592 #if FF_API_UNUSED_MEMBERS
2593 #define FF_CODER_TYPE_DEFLATE 4
2594 #endif /* FF_API_UNUSED_MEMBERS */
2596 * @deprecated use encoder private options instead
2598 attribute_deprecated
2600 #endif /* FF_API_CODER_TYPE */
2602 #if FF_API_PRIVATE_OPT
2603 /** @deprecated use encoder private options instead */
2604 attribute_deprecated
2610 * @deprecated use encoder private options instead
2612 attribute_deprecated
2616 * @deprecated use encoder private options instead
2618 attribute_deprecated
2622 #if FF_API_PRIVATE_OPT
2623 /** @deprecated use encoder private options instead */
2624 attribute_deprecated
2625 int frame_skip_threshold;
2627 /** @deprecated use encoder private options instead */
2628 attribute_deprecated
2629 int frame_skip_factor;
2631 /** @deprecated use encoder private options instead */
2632 attribute_deprecated
2635 /** @deprecated use encoder private options instead */
2636 attribute_deprecated
2638 #endif /* FF_API_PRIVATE_OPT */
2641 * trellis RD quantization
2642 * - encoding: Set by user.
2643 * - decoding: unused
2647 #if FF_API_PRIVATE_OPT
2648 /** @deprecated use encoder private options instead */
2649 attribute_deprecated
2650 int min_prediction_order;
2652 /** @deprecated use encoder private options instead */
2653 attribute_deprecated
2654 int max_prediction_order;
2656 /** @deprecated use encoder private options instead */
2657 attribute_deprecated
2658 int64_t timecode_frame_start;
2661 #if FF_API_RTP_CALLBACK
2663 * @deprecated unused
2665 /* The RTP callback: This function is called */
2666 /* every time the encoder has a packet to send. */
2667 /* It depends on the encoder if the data starts */
2668 /* with a Start Code (it should). H.263 does. */
2669 /* mb_nb contains the number of macroblocks */
2670 /* encoded in the RTP payload. */
2671 attribute_deprecated
2672 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2675 #if FF_API_PRIVATE_OPT
2676 /** @deprecated use encoder private options instead */
2677 attribute_deprecated
2678 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2679 /* do its best to deliver a chunk with size */
2680 /* below rtp_payload_size, the chunk will start */
2681 /* with a start code on some codecs like H.263. */
2682 /* This doesn't take account of any particular */
2683 /* headers inside the transmitted RTP payload. */
2686 #if FF_API_STAT_BITS
2687 /* statistics, used for 2-pass encoding */
2688 attribute_deprecated
2690 attribute_deprecated
2692 attribute_deprecated
2694 attribute_deprecated
2696 attribute_deprecated
2698 attribute_deprecated
2700 attribute_deprecated
2702 attribute_deprecated
2705 /** @deprecated this field is unused */
2706 attribute_deprecated
2711 * pass1 encoding statistics output buffer
2712 * - encoding: Set by libavcodec.
2713 * - decoding: unused
2718 * pass2 encoding statistics input buffer
2719 * Concatenated stuff from stats_out of pass1 should be placed here.
2720 * - encoding: Allocated/set/freed by user.
2721 * - decoding: unused
2726 * Work around bugs in encoders which sometimes cannot be detected automatically.
2727 * - encoding: Set by user
2728 * - decoding: Set by user
2730 int workaround_bugs;
2731 #define FF_BUG_AUTODETECT 1 ///< autodetection
2732 #if FF_API_OLD_MSMPEG4
2733 #define FF_BUG_OLD_MSMPEG4 2
2735 #define FF_BUG_XVID_ILACE 4
2736 #define FF_BUG_UMP4 8
2737 #define FF_BUG_NO_PADDING 16
2738 #define FF_BUG_AMV 32
2740 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2742 #define FF_BUG_QPEL_CHROMA 64
2743 #define FF_BUG_STD_QPEL 128
2744 #define FF_BUG_QPEL_CHROMA2 256
2745 #define FF_BUG_DIRECT_BLOCKSIZE 512
2746 #define FF_BUG_EDGE 1024
2747 #define FF_BUG_HPEL_CHROMA 2048
2748 #define FF_BUG_DC_CLIP 4096
2749 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2750 #define FF_BUG_TRUNCATED 16384
2753 * strictly follow the standard (MPEG4, ...).
2754 * - encoding: Set by user.
2755 * - decoding: Set by user.
2756 * Setting this to STRICT or higher means the encoder and decoder will
2757 * generally do stupid things, whereas setting it to unofficial or lower
2758 * will mean the encoder might produce output that is not supported by all
2759 * spec-compliant decoders. Decoders don't differentiate between normal,
2760 * unofficial and experimental (that is, they always try to decode things
2761 * when they can) unless they are explicitly asked to behave stupidly
2762 * (=strictly conform to the specs)
2764 int strict_std_compliance;
2765 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2766 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2767 #define FF_COMPLIANCE_NORMAL 0
2768 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2769 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2772 * error concealment flags
2773 * - encoding: unused
2774 * - decoding: Set by user.
2776 int error_concealment;
2777 #define FF_EC_GUESS_MVS 1
2778 #define FF_EC_DEBLOCK 2
2779 #define FF_EC_FAVOR_INTER 256
2783 * - encoding: Set by user.
2784 * - decoding: Set by user.
2787 #define FF_DEBUG_PICT_INFO 1
2788 #define FF_DEBUG_RC 2
2789 #define FF_DEBUG_BITSTREAM 4
2790 #define FF_DEBUG_MB_TYPE 8
2791 #define FF_DEBUG_QP 16
2794 * @deprecated this option does nothing
2796 #define FF_DEBUG_MV 32
2798 #define FF_DEBUG_DCT_COEFF 0x00000040
2799 #define FF_DEBUG_SKIP 0x00000080
2800 #define FF_DEBUG_STARTCODE 0x00000100
2801 #if FF_API_UNUSED_MEMBERS
2802 #define FF_DEBUG_PTS 0x00000200
2803 #endif /* FF_API_UNUSED_MEMBERS */
2804 #define FF_DEBUG_ER 0x00000400
2805 #define FF_DEBUG_MMCO 0x00000800
2806 #define FF_DEBUG_BUGS 0x00001000
2808 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2809 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2811 #define FF_DEBUG_BUFFERS 0x00008000
2812 #define FF_DEBUG_THREADS 0x00010000
2813 #define FF_DEBUG_GREEN_MD 0x00800000
2814 #define FF_DEBUG_NOMC 0x01000000
2819 * Code outside libavcodec should access this field using AVOptions
2820 * - encoding: Set by user.
2821 * - decoding: Set by user.
2824 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2825 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2826 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2830 * Error recognition; may misdetect some more or less valid parts as errors.
2831 * - encoding: unused
2832 * - decoding: Set by user.
2834 int err_recognition;
2837 * Verify checksums embedded in the bitstream (could be of either encoded or
2838 * decoded data, depending on the codec) and print an error message on mismatch.
2839 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2840 * decoder returning an error.
2842 #define AV_EF_CRCCHECK (1<<0)
2843 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2844 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2845 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2847 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2848 #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
2849 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2850 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2854 * opaque 64bit number (generally a PTS) that will be reordered and
2855 * output in AVFrame.reordered_opaque
2856 * - encoding: unused
2857 * - decoding: Set by user.
2859 int64_t reordered_opaque;
2862 * Hardware accelerator in use
2863 * - encoding: unused.
2864 * - decoding: Set by libavcodec
2866 struct AVHWAccel *hwaccel;
2869 * Hardware accelerator context.
2870 * For some hardware accelerators, a global context needs to be
2871 * provided by the user. In that case, this holds display-dependent
2872 * data FFmpeg cannot instantiate itself. Please refer to the
2873 * FFmpeg HW accelerator documentation to know how to fill this
2874 * is. e.g. for VA API, this is a struct vaapi_context.
2875 * - encoding: unused
2876 * - decoding: Set by user
2878 void *hwaccel_context;
2882 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2883 * - decoding: unused
2885 uint64_t error[AV_NUM_DATA_POINTERS];
2888 * DCT algorithm, see FF_DCT_* below
2889 * - encoding: Set by user.
2890 * - decoding: unused
2893 #define FF_DCT_AUTO 0
2894 #define FF_DCT_FASTINT 1
2895 #define FF_DCT_INT 2
2896 #define FF_DCT_MMX 3
2897 #define FF_DCT_ALTIVEC 5
2898 #define FF_DCT_FAAN 6
2901 * IDCT algorithm, see FF_IDCT_* below.
2902 * - encoding: Set by user.
2903 * - decoding: Set by user.
2906 #define FF_IDCT_AUTO 0
2907 #define FF_IDCT_INT 1
2908 #define FF_IDCT_SIMPLE 2
2909 #define FF_IDCT_SIMPLEMMX 3
2910 #define FF_IDCT_ARM 7
2911 #define FF_IDCT_ALTIVEC 8
2913 #define FF_IDCT_SH4 9
2915 #define FF_IDCT_SIMPLEARM 10
2916 #if FF_API_UNUSED_MEMBERS
2917 #define FF_IDCT_IPP 13
2918 #endif /* FF_API_UNUSED_MEMBERS */
2919 #define FF_IDCT_XVID 14
2920 #if FF_API_IDCT_XVIDMMX
2921 #define FF_IDCT_XVIDMMX 14
2922 #endif /* FF_API_IDCT_XVIDMMX */
2923 #define FF_IDCT_SIMPLEARMV5TE 16
2924 #define FF_IDCT_SIMPLEARMV6 17
2925 #if FF_API_ARCH_SPARC
2926 #define FF_IDCT_SIMPLEVIS 18
2928 #define FF_IDCT_FAAN 20
2929 #define FF_IDCT_SIMPLENEON 22
2930 #if FF_API_ARCH_ALPHA
2931 #define FF_IDCT_SIMPLEALPHA 23
2933 #define FF_IDCT_SIMPLEAUTO 128
2936 * bits per sample/pixel from the demuxer (needed for huffyuv).
2937 * - encoding: Set by libavcodec.
2938 * - decoding: Set by user.
2940 int bits_per_coded_sample;
2943 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2944 * - encoding: set by user.
2945 * - decoding: set by libavcodec.
2947 int bits_per_raw_sample;
2951 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2952 * - encoding: unused
2953 * - decoding: Set by user.
2954 * Code outside libavcodec should access this field using:
2955 * av_codec_{get,set}_lowres(avctx)
2960 #if FF_API_CODED_FRAME
2962 * the picture in the bitstream
2963 * - encoding: Set by libavcodec.
2964 * - decoding: unused
2966 * @deprecated use the quality factor packet side data instead
2968 attribute_deprecated AVFrame *coded_frame;
2973 * is used to decide how many independent tasks should be passed to execute()
2974 * - encoding: Set by user.
2975 * - decoding: Set by user.
2980 * Which multithreading methods to use.
2981 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2982 * so clients which cannot provide future frames should not use it.
2984 * - encoding: Set by user, otherwise the default is used.
2985 * - decoding: Set by user, otherwise the default is used.
2988 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2989 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2992 * Which multithreading methods are in use by the codec.
2993 * - encoding: Set by libavcodec.
2994 * - decoding: Set by libavcodec.
2996 int active_thread_type;
2999 * Set by the client if its custom get_buffer() callback can be called
3000 * synchronously from another thread, which allows faster multithreaded decoding.
3001 * draw_horiz_band() will be called from other threads regardless of this setting.
3002 * Ignored if the default get_buffer() is used.
3003 * - encoding: Set by user.
3004 * - decoding: Set by user.
3006 int thread_safe_callbacks;
3009 * The codec may call this to execute several independent things.
3010 * It will return only after finishing all tasks.
3011 * The user may replace this with some multithreaded implementation,
3012 * the default implementation will execute the parts serially.
3013 * @param count the number of things to execute
3014 * - encoding: Set by libavcodec, user can override.
3015 * - decoding: Set by libavcodec, user can override.
3017 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3020 * The codec may call this to execute several independent things.
3021 * It will return only after finishing all tasks.
3022 * The user may replace this with some multithreaded implementation,
3023 * the default implementation will execute the parts serially.
3024 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3025 * @param c context passed also to func
3026 * @param count the number of things to execute
3027 * @param arg2 argument passed unchanged to func
3028 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3029 * @param func function that will be called count times, with jobnr from 0 to count-1.
3030 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3031 * two instances of func executing at the same time will have the same threadnr.
3032 * @return always 0 currently, but code should handle a future improvement where when any call to func
3033 * returns < 0 no further calls to func may be done and < 0 is returned.
3034 * - encoding: Set by libavcodec, user can override.
3035 * - decoding: Set by libavcodec, user can override.
3037 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3040 * noise vs. sse weight for the nsse comparison function
3041 * - encoding: Set by user.
3042 * - decoding: unused
3048 * - encoding: Set by user.
3049 * - decoding: Set by libavcodec.
3052 #define FF_PROFILE_UNKNOWN -99
3053 #define FF_PROFILE_RESERVED -100
3055 #define FF_PROFILE_AAC_MAIN 0
3056 #define FF_PROFILE_AAC_LOW 1
3057 #define FF_PROFILE_AAC_SSR 2
3058 #define FF_PROFILE_AAC_LTP 3
3059 #define FF_PROFILE_AAC_HE 4
3060 #define FF_PROFILE_AAC_HE_V2 28
3061 #define FF_PROFILE_AAC_LD 22
3062 #define FF_PROFILE_AAC_ELD 38
3063 #define FF_PROFILE_MPEG2_AAC_LOW 128
3064 #define FF_PROFILE_MPEG2_AAC_HE 131
3066 #define FF_PROFILE_DTS 20
3067 #define FF_PROFILE_DTS_ES 30
3068 #define FF_PROFILE_DTS_96_24 40
3069 #define FF_PROFILE_DTS_HD_HRA 50
3070 #define FF_PROFILE_DTS_HD_MA 60
3071 #define FF_PROFILE_DTS_EXPRESS 70
3073 #define FF_PROFILE_MPEG2_422 0
3074 #define FF_PROFILE_MPEG2_HIGH 1
3075 #define FF_PROFILE_MPEG2_SS 2
3076 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3077 #define FF_PROFILE_MPEG2_MAIN 4
3078 #define FF_PROFILE_MPEG2_SIMPLE 5
3080 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3081 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3083 #define FF_PROFILE_H264_BASELINE 66
3084 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3085 #define FF_PROFILE_H264_MAIN 77
3086 #define FF_PROFILE_H264_EXTENDED 88
3087 #define FF_PROFILE_H264_HIGH 100
3088 #define FF_PROFILE_H264_HIGH_10 110
3089 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3090 #define FF_PROFILE_H264_HIGH_422 122
3091 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3092 #define FF_PROFILE_H264_HIGH_444 144
3093 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3094 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3095 #define FF_PROFILE_H264_CAVLC_444 44
3097 #define FF_PROFILE_VC1_SIMPLE 0
3098 #define FF_PROFILE_VC1_MAIN 1
3099 #define FF_PROFILE_VC1_COMPLEX 2
3100 #define FF_PROFILE_VC1_ADVANCED 3
3102 #define FF_PROFILE_MPEG4_SIMPLE 0
3103 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3104 #define FF_PROFILE_MPEG4_CORE 2
3105 #define FF_PROFILE_MPEG4_MAIN 3
3106 #define FF_PROFILE_MPEG4_N_BIT 4
3107 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3108 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3109 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3110 #define FF_PROFILE_MPEG4_HYBRID 8
3111 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3112 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3113 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3114 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3115 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3116 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3117 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3119 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3120 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3121 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3122 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3123 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3125 #define FF_PROFILE_VP9_0 0
3126 #define FF_PROFILE_VP9_1 1
3127 #define FF_PROFILE_VP9_2 2
3128 #define FF_PROFILE_VP9_3 3
3130 #define FF_PROFILE_HEVC_MAIN 1
3131 #define FF_PROFILE_HEVC_MAIN_10 2
3132 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3133 #define FF_PROFILE_HEVC_REXT 4
3137 * - encoding: Set by user.
3138 * - decoding: Set by libavcodec.
3141 #define FF_LEVEL_UNKNOWN -99
3144 * Skip loop filtering for selected frames.
3145 * - encoding: unused
3146 * - decoding: Set by user.
3148 enum AVDiscard skip_loop_filter;
3151 * Skip IDCT/dequantization for selected frames.
3152 * - encoding: unused
3153 * - decoding: Set by user.
3155 enum AVDiscard skip_idct;
3158 * Skip decoding for selected frames.
3159 * - encoding: unused
3160 * - decoding: Set by user.
3162 enum AVDiscard skip_frame;
3165 * Header containing style information for text subtitles.
3166 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3167 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3168 * the Format line following. It shouldn't include any Dialogue line.
3169 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3170 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3172 uint8_t *subtitle_header;
3173 int subtitle_header_size;
3175 #if FF_API_ERROR_RATE
3177 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3180 attribute_deprecated
3184 #if FF_API_VBV_DELAY
3186 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3187 * Used for compliant TS muxing.
3188 * - encoding: Set by libavcodec.
3189 * - decoding: unused.
3190 * @deprecated this value is now exported as a part of
3191 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3193 attribute_deprecated
3197 #if FF_API_SIDEDATA_ONLY_PKT
3199 * Encoding only and set by default. Allow encoders to output packets
3200 * that do not contain any encoded data, only side data.
3202 * Some encoders need to output such packets, e.g. to update some stream
3203 * parameters at the end of encoding.
3205 * @deprecated this field disables the default behaviour and
3206 * it is kept only for compatibility.
3208 attribute_deprecated
3209 int side_data_only_packets;
3213 * Audio only. The number of "priming" samples (padding) inserted by the
3214 * encoder at the beginning of the audio. I.e. this number of leading
3215 * decoded samples must be discarded by the caller to get the original audio
3216 * without leading padding.
3218 * - decoding: unused
3219 * - encoding: Set by libavcodec. The timestamps on the output packets are
3220 * adjusted by the encoder so that they always refer to the
3221 * first sample of the data actually contained in the packet,
3222 * including any added padding. E.g. if the timebase is
3223 * 1/samplerate and the timestamp of the first input sample is
3224 * 0, the timestamp of the first output packet will be
3227 int initial_padding;
3230 * - decoding: For codecs that store a framerate value in the compressed
3231 * bitstream, the decoder may export it here. { 0, 1} when
3233 * - encoding: unused
3235 AVRational framerate;
3238 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3239 * - encoding: unused.
3240 * - decoding: Set by libavcodec before calling get_format()
3242 enum AVPixelFormat sw_pix_fmt;
3245 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3246 * Code outside libavcodec should access this field using:
3247 * av_codec_{get,set}_pkt_timebase(avctx)
3248 * - encoding unused.
3249 * - decoding set by user.
3251 AVRational pkt_timebase;
3255 * Code outside libavcodec should access this field using:
3256 * av_codec_{get,set}_codec_descriptor(avctx)
3257 * - encoding: unused.
3258 * - decoding: set by libavcodec.
3260 const AVCodecDescriptor *codec_descriptor;
3264 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3265 * - encoding: unused
3266 * - decoding: Set by user.
3267 * Code outside libavcodec should access this field using:
3268 * av_codec_{get,set}_lowres(avctx)
3274 * Current statistics for PTS correction.
3275 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3276 * - encoding: unused
3278 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3279 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3280 int64_t pts_correction_last_pts; /// PTS of the last frame
3281 int64_t pts_correction_last_dts; /// DTS of the last frame
3284 * Character encoding of the input subtitles file.
3285 * - decoding: set by user
3286 * - encoding: unused
3291 * Subtitles character encoding mode. Formats or codecs might be adjusting
3292 * this setting (if they are doing the conversion themselves for instance).
3293 * - decoding: set by libavcodec
3294 * - encoding: unused
3296 int sub_charenc_mode;
3297 #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)
3298 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3299 #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
3302 * Skip processing alpha if supported by codec.
3303 * Note that if the format uses pre-multiplied alpha (common with VP6,
3304 * and recommended due to better video quality/compression)
3305 * the image will look as if alpha-blended onto a black background.
3306 * However for formats that do not use pre-multiplied alpha
3307 * there might be serious artefacts (though e.g. libswscale currently
3308 * assumes pre-multiplied alpha anyway).
3309 * Code outside libavcodec should access this field using AVOptions
3311 * - decoding: set by user
3312 * - encoding: unused
3317 * Number of samples to skip after a discontinuity
3318 * - decoding: unused
3319 * - encoding: set by libavcodec
3323 #if !FF_API_DEBUG_MV
3325 * debug motion vectors
3326 * Code outside libavcodec should access this field using AVOptions
3327 * - encoding: Set by user.
3328 * - decoding: Set by user.
3331 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3332 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3333 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3337 * custom intra quantization matrix
3338 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3339 * - encoding: Set by user, can be NULL.
3340 * - decoding: unused.
3342 uint16_t *chroma_intra_matrix;
3345 * dump format separator.
3346 * can be ", " or "\n " or anything else
3347 * Code outside libavcodec should access this field using AVOptions
3348 * (NO direct access).
3349 * - encoding: Set by user.
3350 * - decoding: Set by user.
3352 uint8_t *dump_separator;
3355 * ',' separated list of allowed decoders.
3356 * If NULL then all are allowed
3357 * - encoding: unused
3358 * - decoding: set by user through AVOPtions (NO direct access)
3360 char *codec_whitelist;
3363 * Properties of the stream that gets decoded
3364 * To be accessed through av_codec_get_properties() (NO direct access)
3365 * - encoding: unused
3366 * - decoding: set by libavcodec
3368 unsigned properties;
3369 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3370 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3373 * Additional data associated with the entire coded stream.
3375 * - decoding: unused
3376 * - encoding: may be set by libavcodec after avcodec_open2().
3378 AVPacketSideData *coded_side_data;
3379 int nb_coded_side_data;
3384 * For hardware encoders configured to use a hwaccel pixel format, this
3385 * field should be set by the caller to a reference to the AVHWFramesContext
3386 * describing input frames. AVHWFramesContext.format must be equal to
3387 * AVCodecContext.pix_fmt.
3389 * This field should be set before avcodec_open2() is called and is
3390 * afterwards owned and managed by libavcodec.
3392 AVBufferRef *hw_frames_ctx;
3395 * Control the form of AVSubtitle.rects[N]->ass
3396 * - decoding: set by user
3397 * - encoding: unused
3399 int sub_text_format;
3400 #define FF_SUB_TEXT_FMT_ASS 0
3401 #if FF_API_ASS_TIMING
3402 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3407 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3408 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3410 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3411 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3413 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3415 int av_codec_get_lowres(const AVCodecContext *avctx);
3416 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3418 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3419 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3421 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3422 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3427 typedef struct AVProfile {
3429 const char *name; ///< short name for the profile
3432 typedef struct AVCodecDefault AVCodecDefault;
3439 typedef struct AVCodec {
3441 * Name of the codec implementation.
3442 * The name is globally unique among encoders and among decoders (but an
3443 * encoder and a decoder can share the same name).
3444 * This is the primary way to find a codec from the user perspective.
3448 * Descriptive name for the codec, meant to be more human readable than name.
3449 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3451 const char *long_name;
3452 enum AVMediaType type;
3455 * Codec capabilities.
3456 * see AV_CODEC_CAP_*
3459 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3460 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3461 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3462 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3463 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3464 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3465 const AVClass *priv_class; ///< AVClass for the private context
3466 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3468 /*****************************************************************
3469 * No fields below this line are part of the public API. They
3470 * may not be used outside of libavcodec and can be changed and
3472 * New public fields should be added right above.
3473 *****************************************************************
3476 struct AVCodec *next;
3478 * @name Frame-level threading support functions
3482 * If defined, called on thread contexts when they are created.
3483 * If the codec allocates writable tables in init(), re-allocate them here.
3484 * priv_data will be set to a copy of the original.
3486 int (*init_thread_copy)(AVCodecContext *);
3488 * Copy necessary context variables from a previous thread context to the current one.
3489 * If not defined, the next thread will start automatically; otherwise, the codec
3490 * must call ff_thread_finish_setup().
3492 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3494 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3498 * Private codec-specific defaults.
3500 const AVCodecDefault *defaults;
3503 * Initialize codec static data, called from avcodec_register().
3505 void (*init_static_data)(struct AVCodec *codec);
3507 int (*init)(AVCodecContext *);
3508 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3509 const struct AVSubtitle *sub);
3511 * Encode data to an AVPacket.
3513 * @param avctx codec context
3514 * @param avpkt output AVPacket (may contain a user-provided buffer)
3515 * @param[in] frame AVFrame containing the raw data to be encoded
3516 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3517 * non-empty packet was returned in avpkt.
3518 * @return 0 on success, negative error code on failure
3520 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3521 int *got_packet_ptr);
3522 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3523 int (*close)(AVCodecContext *);
3526 * Will be called when seeking
3528 void (*flush)(AVCodecContext *);
3530 * Internal codec capabilities.
3531 * See FF_CODEC_CAP_* in internal.h
3536 int av_codec_get_max_lowres(const AVCodec *codec);
3538 struct MpegEncContext;
3541 * @defgroup lavc_hwaccel AVHWAccel
3544 typedef struct AVHWAccel {
3546 * Name of the hardware accelerated codec.
3547 * The name is globally unique among encoders and among decoders (but an
3548 * encoder and a decoder can share the same name).
3553 * Type of codec implemented by the hardware accelerator.
3555 * See AVMEDIA_TYPE_xxx
3557 enum AVMediaType type;
3560 * Codec implemented by the hardware accelerator.
3562 * See AV_CODEC_ID_xxx
3567 * Supported pixel format.
3569 * Only hardware accelerated formats are supported here.
3571 enum AVPixelFormat pix_fmt;
3574 * Hardware accelerated codec capabilities.
3575 * see HWACCEL_CODEC_CAP_*
3579 /*****************************************************************
3580 * No fields below this line are part of the public API. They
3581 * may not be used outside of libavcodec and can be changed and
3583 * New public fields should be added right above.
3584 *****************************************************************
3586 struct AVHWAccel *next;
3589 * Allocate a custom buffer
3591 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3594 * Called at the beginning of each frame or field picture.
3596 * Meaningful frame information (codec specific) is guaranteed to
3597 * be parsed at this point. This function is mandatory.
3599 * Note that buf can be NULL along with buf_size set to 0.
3600 * Otherwise, this means the whole frame is available at this point.
3602 * @param avctx the codec context
3603 * @param buf the frame data buffer base
3604 * @param buf_size the size of the frame in bytes
3605 * @return zero if successful, a negative value otherwise
3607 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3610 * Callback for each slice.
3612 * Meaningful slice information (codec specific) is guaranteed to
3613 * be parsed at this point. This function is mandatory.
3614 * The only exception is XvMC, that works on MB level.
3616 * @param avctx the codec context
3617 * @param buf the slice data buffer base
3618 * @param buf_size the size of the slice in bytes
3619 * @return zero if successful, a negative value otherwise
3621 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3624 * Called at the end of each frame or field picture.
3626 * The whole picture is parsed at this point and can now be sent
3627 * to the hardware accelerator. This function is mandatory.
3629 * @param avctx the codec context
3630 * @return zero if successful, a negative value otherwise
3632 int (*end_frame)(AVCodecContext *avctx);
3635 * Size of per-frame hardware accelerator private data.
3637 * Private data is allocated with av_mallocz() before
3638 * AVCodecContext.get_buffer() and deallocated after
3639 * AVCodecContext.release_buffer().
3641 int frame_priv_data_size;
3644 * Called for every Macroblock in a slice.
3646 * XvMC uses it to replace the ff_mpv_decode_mb().
3647 * Instead of decoding to raw picture, MB parameters are
3648 * stored in an array provided by the video driver.
3650 * @param s the mpeg context
3652 void (*decode_mb)(struct MpegEncContext *s);
3655 * Initialize the hwaccel private data.
3657 * This will be called from ff_get_format(), after hwaccel and
3658 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3661 int (*init)(AVCodecContext *avctx);
3664 * Uninitialize the hwaccel private data.
3666 * This will be called from get_format() or avcodec_close(), after hwaccel
3667 * and hwaccel_context are already uninitialized.
3669 int (*uninit)(AVCodecContext *avctx);
3672 * Size of the private data to allocate in
3673 * AVCodecInternal.hwaccel_priv_data.
3679 * Hardware acceleration should be used for decoding even if the codec level
3680 * used is unknown or higher than the maximum supported level reported by the
3683 * It's generally a good idea to pass this flag unless you have a specific
3684 * reason not to, as hardware tends to under-report supported levels.
3686 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3689 * Hardware acceleration can output YUV pixel formats with a different chroma
3690 * sampling than 4:2:0 and/or other than 8 bits per component.
3692 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3698 #if FF_API_AVPICTURE
3700 * @defgroup lavc_picture AVPicture
3702 * Functions for working with AVPicture
3707 * Picture data structure.
3709 * Up to four components can be stored into it, the last component is
3711 * @deprecated use AVFrame or imgutils functions instead
3713 typedef struct AVPicture {
3714 attribute_deprecated
3715 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3716 attribute_deprecated
3717 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3725 enum AVSubtitleType {
3728 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3731 * Plain text, the text field must be set by the decoder and is
3732 * authoritative. ass and pict fields may contain approximations.
3737 * Formatted text, the ass field must be set by the decoder and is
3738 * authoritative. pict and text fields may contain approximations.
3743 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3745 typedef struct AVSubtitleRect {
3746 int x; ///< top left corner of pict, undefined when pict is not set
3747 int y; ///< top left corner of pict, undefined when pict is not set
3748 int w; ///< width of pict, undefined when pict is not set
3749 int h; ///< height of pict, undefined when pict is not set
3750 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3752 #if FF_API_AVPICTURE
3754 * @deprecated unused
3756 attribute_deprecated
3760 * data+linesize for the bitmap of this subtitle.
3761 * Can be set for text/ass as well once they are rendered.
3766 enum AVSubtitleType type;
3768 char *text; ///< 0 terminated plain UTF-8 text
3771 * 0 terminated ASS/SSA compatible event line.
3772 * The presentation of this is unaffected by the other values in this
3780 typedef struct AVSubtitle {
3781 uint16_t format; /* 0 = graphics */
3782 uint32_t start_display_time; /* relative to packet pts, in ms */
3783 uint32_t end_display_time; /* relative to packet pts, in ms */
3785 AVSubtitleRect **rects;
3786 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3790 * This struct describes the properties of an encoded stream.
3792 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
3793 * be allocated with avcodec_parameters_alloc() and freed with
3794 * avcodec_parameters_free().
3796 typedef struct AVCodecParameters {
3798 * General type of the encoded data.
3800 enum AVMediaType codec_type;
3802 * Specific type of the encoded data (the codec used).
3804 enum AVCodecID codec_id;
3806 * Additional information about the codec (corresponds to the AVI FOURCC).
3811 * Extra binary data needed for initializing the decoder, codec-dependent.
3813 * Must be allocated with av_malloc() and will be freed by
3814 * avcodec_parameters_free(). The allocated size of extradata must be at
3815 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
3820 * Size of the extradata content in bytes.
3825 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
3826 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
3831 * The average bitrate of the encoded data (in bits per second).
3836 * The number of bits per sample in the codedwords.
3838 * This is basically the bitrate per sample. It is mandatory for a bunch of
3839 * formats to actually decode them. It's the number of bits for one sample in
3840 * the actual coded bitstream.
3842 * This could be for example 4 for ADPCM
3843 * For PCM formats this matches bits_per_raw_sample
3846 int bits_per_coded_sample;
3849 * This is the number of valid bits in each output sample. If the
3850 * sample format has more bits, the least significant bits are additional
3851 * padding bits, which are always 0. Use right shifts to reduce the sample
3852 * to its actual size. For example, audio formats with 24 bit samples will
3853 * have bits_per_raw_sample set to 24, and format set to AV_SAMPLEFMT_S32.
3854 * To get the original sample use "(uint32_t)sample >> 8"."
3856 * For ADPCM this might be 12 or 16 or similar
3859 int bits_per_raw_sample;
3862 * Codec-specific bitstream restrictions that the stream conforms to.
3868 * Video only. The dimensions of the video frame in pixels.
3874 * Video only. The aspect ratio (width / height) which a single pixel
3875 * should have when displayed.
3877 * When the aspect ratio is unknown / undefined, the numerator should be
3878 * set to 0 (the denominator may have any value).
3880 AVRational sample_aspect_ratio;
3883 * Video only. The order of the fields in interlaced video.
3885 enum AVFieldOrder field_order;
3888 * Video only. Additional colorspace characteristics.
3890 enum AVColorRange color_range;
3891 enum AVColorPrimaries color_primaries;
3892 enum AVColorTransferCharacteristic color_trc;
3893 enum AVColorSpace color_space;
3894 enum AVChromaLocation chroma_location;
3897 * Video only. Number of delayed frames.
3902 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
3903 * unknown or unspecified, otherwise the number of bits set must be equal to
3904 * the channels field.
3906 uint64_t channel_layout;
3908 * Audio only. The number of audio channels.
3912 * Audio only. The number of audio samples per second.
3916 * Audio only. The number of bytes per coded audio frame, required by some
3919 * Corresponds to nBlockAlign in WAVEFORMATEX.
3923 * Audio only. Audio frame size, if known. Required by some formats to be static.
3928 * Audio only. The amount of padding (in samples) inserted by the encoder at
3929 * the beginning of the audio. I.e. this number of leading decoded samples
3930 * must be discarded by the caller to get the original audio without leading
3933 int initial_padding;
3935 * Audio only. The amount of padding (in samples) appended by the encoder to
3936 * the end of the audio. I.e. this number of decoded samples must be
3937 * discarded by the caller from the end of the stream to get the original
3938 * audio without any trailing padding.
3940 int trailing_padding;
3942 * Audio only. Number of samples to skip after a discontinuity.
3945 } AVCodecParameters;
3948 * If c is NULL, returns the first registered codec,
3949 * if c is non-NULL, returns the next registered codec after c,
3950 * or NULL if c is the last one.
3952 AVCodec *av_codec_next(const AVCodec *c);
3955 * Return the LIBAVCODEC_VERSION_INT constant.
3957 unsigned avcodec_version(void);
3960 * Return the libavcodec build-time configuration.
3962 const char *avcodec_configuration(void);
3965 * Return the libavcodec license.
3967 const char *avcodec_license(void);
3970 * Register the codec codec and initialize libavcodec.
3972 * @warning either this function or avcodec_register_all() must be called
3973 * before any other libavcodec functions.
3975 * @see avcodec_register_all()
3977 void avcodec_register(AVCodec *codec);
3980 * Register all the codecs, parsers and bitstream filters which were enabled at
3981 * configuration time. If you do not call this function you can select exactly
3982 * which formats you want to support, by using the individual registration
3985 * @see avcodec_register
3986 * @see av_register_codec_parser
3987 * @see av_register_bitstream_filter
3989 void avcodec_register_all(void);
3992 * Allocate an AVCodecContext and set its fields to default values. The
3993 * resulting struct should be freed with avcodec_free_context().
3995 * @param codec if non-NULL, allocate private data and initialize defaults
3996 * for the given codec. It is illegal to then call avcodec_open2()
3997 * with a different codec.
3998 * If NULL, then the codec-specific defaults won't be initialized,
3999 * which may result in suboptimal default settings (this is
4000 * important mainly for encoders, e.g. libx264).
4002 * @return An AVCodecContext filled with default values or NULL on failure.
4003 * @see avcodec_get_context_defaults
4005 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
4008 * Free the codec context and everything associated with it and write NULL to
4009 * the provided pointer.
4011 void avcodec_free_context(AVCodecContext **avctx);
4014 * Set the fields of the given AVCodecContext to default values corresponding
4015 * to the given codec (defaults may be codec-dependent).
4017 * Do not call this function if a non-NULL codec has been passed
4018 * to avcodec_alloc_context3() that allocated this AVCodecContext.
4019 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
4020 * different codec on this AVCodecContext.
4022 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
4025 * Get the AVClass for AVCodecContext. It can be used in combination with
4026 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4028 * @see av_opt_find().
4030 const AVClass *avcodec_get_class(void);
4033 * Get the AVClass for AVFrame. It can be used in combination with
4034 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4036 * @see av_opt_find().
4038 const AVClass *avcodec_get_frame_class(void);
4041 * Get the AVClass for AVSubtitleRect. It can be used in combination with
4042 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4044 * @see av_opt_find().
4046 const AVClass *avcodec_get_subtitle_rect_class(void);
4049 * Copy the settings of the source AVCodecContext into the destination
4050 * AVCodecContext. The resulting destination codec context will be
4051 * unopened, i.e. you are required to call avcodec_open2() before you
4052 * can use this AVCodecContext to decode/encode video/audio data.
4054 * @param dest target codec context, should be initialized with
4055 * avcodec_alloc_context3(NULL), but otherwise uninitialized
4056 * @param src source codec context
4057 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4059 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
4062 * Allocate a new AVCodecParameters and set its fields to default values
4063 * (unknown/invalid/0). The returned struct must be freed with
4064 * avcodec_parameters_free().
4066 AVCodecParameters *avcodec_parameters_alloc(void);
4069 * Free an AVCodecParameters instance and everything associated with it and
4070 * write NULL to the supplied pointer.
4072 void avcodec_parameters_free(AVCodecParameters **par);
4075 * Copy the contents of src to dst. Any allocated fields in dst are freed and
4076 * replaced with newly allocated duplicates of the corresponding fields in src.
4078 * @return >= 0 on success, a negative AVERROR code on failure.
4080 int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
4083 * Fill the parameters struct based on the values from the supplied codec
4084 * context. Any allocated fields in par are freed and replaced with duplicates
4085 * of the corresponding fields in codec.
4087 * @return >= 0 on success, a negative AVERROR code on failure
4089 int avcodec_parameters_from_context(AVCodecParameters *par,
4090 const AVCodecContext *codec);
4093 * Fill the codec context based on the values from the supplied codec
4094 * parameters. Any allocated fields in codec that have a corresponding field in
4095 * par are freed and replaced with duplicates of the corresponding field in par.
4096 * Fields in codec that do not have a counterpart in par are not touched.
4098 * @return >= 0 on success, a negative AVERROR code on failure.
4100 int avcodec_parameters_to_context(AVCodecContext *codec,
4101 const AVCodecParameters *par);
4104 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4105 * function the context has to be allocated with avcodec_alloc_context3().
4107 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4108 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4109 * retrieving a codec.
4111 * @warning This function is not thread safe!
4113 * @note Always call this function before using decoding routines (such as
4114 * @ref avcodec_decode_video2()).
4117 * avcodec_register_all();
4118 * av_dict_set(&opts, "b", "2.5M", 0);
4119 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
4123 * context = avcodec_alloc_context3(codec);
4125 * if (avcodec_open2(context, codec, opts) < 0)
4129 * @param avctx The context to initialize.
4130 * @param codec The codec to open this context for. If a non-NULL codec has been
4131 * previously passed to avcodec_alloc_context3() or
4132 * avcodec_get_context_defaults3() for this context, then this
4133 * parameter MUST be either NULL or equal to the previously passed
4135 * @param options A dictionary filled with AVCodecContext and codec-private options.
4136 * On return this object will be filled with options that were not found.
4138 * @return zero on success, a negative value on error
4139 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4140 * av_dict_set(), av_opt_find().
4142 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4145 * Close a given AVCodecContext and free all the data associated with it
4146 * (but not the AVCodecContext itself).
4148 * Calling this function on an AVCodecContext that hasn't been opened will free
4149 * the codec-specific data allocated in avcodec_alloc_context3() /
4150 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
4153 int avcodec_close(AVCodecContext *avctx);
4156 * Free all allocated data in the given subtitle struct.
4158 * @param sub AVSubtitle to free.
4160 void avsubtitle_free(AVSubtitle *sub);
4167 * @addtogroup lavc_packet
4172 * Allocate an AVPacket and set its fields to default values. The resulting
4173 * struct must be freed using av_packet_free().
4175 * @return An AVPacket filled with default values or NULL on failure.
4177 * @note this only allocates the AVPacket itself, not the data buffers. Those
4178 * must be allocated through other means such as av_new_packet.
4180 * @see av_new_packet
4182 AVPacket *av_packet_alloc(void);
4185 * Create a new packet that references the same data as src.
4187 * This is a shortcut for av_packet_alloc()+av_packet_ref().
4189 * @return newly created AVPacket on success, NULL on error.
4191 * @see av_packet_alloc
4192 * @see av_packet_ref
4194 AVPacket *av_packet_clone(AVPacket *src);
4197 * Free the packet, if the packet is reference counted, it will be
4198 * unreferenced first.
4200 * @param packet packet to be freed. The pointer will be set to NULL.
4201 * @note passing NULL is a no-op.
4203 void av_packet_free(AVPacket **pkt);
4206 * Initialize optional fields of a packet with default values.
4208 * Note, this does not touch the data and size members, which have to be
4209 * initialized separately.
4213 void av_init_packet(AVPacket *pkt);
4216 * Allocate the payload of a packet and initialize its fields with
4220 * @param size wanted payload size
4221 * @return 0 if OK, AVERROR_xxx otherwise
4223 int av_new_packet(AVPacket *pkt, int size);
4226 * Reduce packet size, correctly zeroing padding
4229 * @param size new size
4231 void av_shrink_packet(AVPacket *pkt, int size);
4234 * Increase packet size, correctly zeroing padding
4237 * @param grow_by number of bytes by which to increase the size of the packet
4239 int av_grow_packet(AVPacket *pkt, int grow_by);
4242 * Initialize a reference-counted packet from av_malloc()ed data.
4244 * @param pkt packet to be initialized. This function will set the data, size,
4245 * buf and destruct fields, all others are left untouched.
4246 * @param data Data allocated by av_malloc() to be used as packet data. If this
4247 * function returns successfully, the data is owned by the underlying AVBuffer.
4248 * The caller may not access the data through other means.
4249 * @param size size of data in bytes, without the padding. I.e. the full buffer
4250 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4252 * @return 0 on success, a negative AVERROR on error
4254 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4256 #if FF_API_AVPACKET_OLD_API
4258 * @warning This is a hack - the packet memory allocation stuff is broken. The
4259 * packet is allocated if it was not really allocated.
4261 * @deprecated Use av_packet_ref
4263 attribute_deprecated
4264 int av_dup_packet(AVPacket *pkt);
4266 * Copy packet, including contents
4268 * @return 0 on success, negative AVERROR on fail
4270 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4273 * Copy packet side data
4275 * @return 0 on success, negative AVERROR on fail
4277 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4282 * @deprecated Use av_packet_unref
4284 * @param pkt packet to free
4286 attribute_deprecated
4287 void av_free_packet(AVPacket *pkt);
4290 * Allocate new information of a packet.
4293 * @param type side information type
4294 * @param size side information size
4295 * @return pointer to fresh allocated data or NULL otherwise
4297 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4301 * Wrap an existing array as a packet side data.
4304 * @param type side information type
4305 * @param data the side data array. It must be allocated with the av_malloc()
4306 * family of functions. The ownership of the data is transferred to
4308 * @param size side information size
4309 * @return a non-negative number on success, a negative AVERROR code on
4310 * failure. On failure, the packet is unchanged and the data remains
4311 * owned by the caller.
4313 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4314 uint8_t *data, size_t size);
4317 * Shrink the already allocated side data buffer
4320 * @param type side information type
4321 * @param size new side information size
4322 * @return 0 on success, < 0 on failure
4324 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4328 * Get side information from packet.
4331 * @param type desired side information type
4332 * @param size pointer for side information size to store (optional)
4333 * @return pointer to data if present or NULL otherwise
4335 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4338 int av_packet_merge_side_data(AVPacket *pkt);
4340 int av_packet_split_side_data(AVPacket *pkt);
4342 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4345 * Pack a dictionary for use in side_data.
4347 * @param dict The dictionary to pack.
4348 * @param size pointer to store the size of the returned data
4349 * @return pointer to data if successful, NULL otherwise
4351 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4353 * Unpack a dictionary from side_data.
4355 * @param data data from side_data
4356 * @param size size of the data
4357 * @param dict the metadata storage dictionary
4358 * @return 0 on success, < 0 on failure
4360 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4364 * Convenience function to free all the side data stored.
4365 * All the other fields stay untouched.
4369 void av_packet_free_side_data(AVPacket *pkt);
4372 * Setup a new reference to the data described by a given packet
4374 * If src is reference-counted, setup dst as a new reference to the
4375 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4376 * data from src into it.
4378 * All the other fields are copied from src.
4380 * @see av_packet_unref
4382 * @param dst Destination packet
4383 * @param src Source packet
4385 * @return 0 on success, a negative AVERROR on error.
4387 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4392 * Unreference the buffer referenced by the packet and reset the
4393 * remaining packet fields to their default values.
4395 * @param pkt The packet to be unreferenced.
4397 void av_packet_unref(AVPacket *pkt);
4400 * Move every field in src to dst and reset src.
4402 * @see av_packet_unref
4404 * @param src Source packet, will be reset
4405 * @param dst Destination packet
4407 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4410 * Copy only "properties" fields from src to dst.
4412 * Properties for the purpose of this function are all the fields
4413 * beside those related to the packet data (buf, data, size)
4415 * @param dst Destination packet
4416 * @param src Source packet
4418 * @return 0 on success AVERROR on failure.
4420 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4423 * Convert valid timing fields (timestamps / durations) in a packet from one
4424 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4427 * @param pkt packet on which the conversion will be performed
4428 * @param tb_src source timebase, in which the timing fields in pkt are
4430 * @param tb_dst destination timebase, to which the timing fields will be
4433 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4440 * @addtogroup lavc_decoding
4445 * Find a registered decoder with a matching codec ID.
4447 * @param id AVCodecID of the requested decoder
4448 * @return A decoder if one was found, NULL otherwise.
4450 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4453 * Find a registered decoder with the specified name.
4455 * @param name name of the requested decoder
4456 * @return A decoder if one was found, NULL otherwise.
4458 AVCodec *avcodec_find_decoder_by_name(const char *name);
4461 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4462 * it can be called by custom get_buffer2() implementations for decoders without
4463 * AV_CODEC_CAP_DR1 set.
4465 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4469 * Return the amount of padding in pixels which the get_buffer callback must
4470 * provide around the edge of the image for codecs which do not have the
4471 * CODEC_FLAG_EMU_EDGE flag.
4473 * @return Required padding in pixels.
4475 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4478 attribute_deprecated
4479 unsigned avcodec_get_edge_width(void);
4483 * Modify width and height values so that they will result in a memory
4484 * buffer that is acceptable for the codec if you do not use any horizontal
4487 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4489 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4492 * Modify width and height values so that they will result in a memory
4493 * buffer that is acceptable for the codec if you also ensure that all
4494 * line sizes are a multiple of the respective linesize_align[i].
4496 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4498 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4499 int linesize_align[AV_NUM_DATA_POINTERS]);
4502 * Converts AVChromaLocation to swscale x/y chroma position.
4504 * The positions represent the chroma (0,0) position in a coordinates system
4505 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4507 * @param xpos horizontal chroma sample position
4508 * @param ypos vertical chroma sample position
4510 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4513 * Converts swscale x/y chroma position to AVChromaLocation.
4515 * The positions represent the chroma (0,0) position in a coordinates system
4516 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4518 * @param xpos horizontal chroma sample position
4519 * @param ypos vertical chroma sample position
4521 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4524 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4526 * Some decoders may support multiple frames in a single AVPacket. Such
4527 * decoders would then just decode the first frame and the return value would be
4528 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4529 * called again with an AVPacket containing the remaining data in order to
4530 * decode the second frame, etc... Even if no frames are returned, the packet
4531 * needs to be fed to the decoder with remaining data until it is completely
4532 * consumed or an error occurs.
4534 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4535 * and output. This means that for some packets they will not immediately
4536 * produce decoded output and need to be flushed at the end of decoding to get
4537 * all the decoded data. Flushing is done by calling this function with packets
4538 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4539 * returning samples. It is safe to flush even those decoders that are not
4540 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4542 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4543 * larger than the actual read bytes because some optimized bitstream
4544 * readers read 32 or 64 bits at once and could read over the end.
4546 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4547 * before packets may be fed to the decoder.
4549 * @param avctx the codec context
4550 * @param[out] frame The AVFrame in which to store decoded audio samples.
4551 * The decoder will allocate a buffer for the decoded frame by
4552 * calling the AVCodecContext.get_buffer2() callback.
4553 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4554 * reference counted and the returned reference belongs to the
4555 * caller. The caller must release the frame using av_frame_unref()
4556 * when the frame is no longer needed. The caller may safely write
4557 * to the frame if av_frame_is_writable() returns 1.
4558 * When AVCodecContext.refcounted_frames is set to 0, the returned
4559 * reference belongs to the decoder and is valid only until the
4560 * next call to this function or until closing or flushing the
4561 * decoder. The caller may not write to it.
4562 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4563 * non-zero. Note that this field being set to zero
4564 * does not mean that an error has occurred. For
4565 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4566 * call is guaranteed to produce a frame.
4567 * @param[in] avpkt The input AVPacket containing the input buffer.
4568 * At least avpkt->data and avpkt->size should be set. Some
4569 * decoders might also require additional fields to be set.
4570 * @return A negative error code is returned if an error occurred during
4571 * decoding, otherwise the number of bytes consumed from the input
4572 * AVPacket is returned.
4574 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4575 int *got_frame_ptr, const AVPacket *avpkt);
4578 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4579 * Some decoders may support multiple frames in a single AVPacket, such
4580 * decoders would then just decode the first frame.
4582 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4583 * the actual read bytes because some optimized bitstream readers read 32 or 64
4584 * bits at once and could read over the end.
4586 * @warning The end of the input buffer buf should be set to 0 to ensure that
4587 * no overreading happens for damaged MPEG streams.
4589 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4590 * between input and output, these need to be fed with avpkt->data=NULL,
4591 * avpkt->size=0 at the end to return the remaining frames.
4593 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4594 * before packets may be fed to the decoder.
4596 * @param avctx the codec context
4597 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4598 * Use av_frame_alloc() to get an AVFrame. The codec will
4599 * allocate memory for the actual bitmap by calling the
4600 * AVCodecContext.get_buffer2() callback.
4601 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4602 * reference counted and the returned reference belongs to the
4603 * caller. The caller must release the frame using av_frame_unref()
4604 * when the frame is no longer needed. The caller may safely write
4605 * to the frame if av_frame_is_writable() returns 1.
4606 * When AVCodecContext.refcounted_frames is set to 0, the returned
4607 * reference belongs to the decoder and is valid only until the
4608 * next call to this function or until closing or flushing the
4609 * decoder. The caller may not write to it.
4611 * @param[in] avpkt The input AVPacket containing the input buffer.
4612 * You can create such packet with av_init_packet() and by then setting
4613 * data and size, some decoders might in addition need other fields like
4614 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4616 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4617 * @return On error a negative value is returned, otherwise the number of bytes
4618 * used or zero if no frame could be decompressed.
4620 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4621 int *got_picture_ptr,
4622 const AVPacket *avpkt);
4625 * Decode a subtitle message.
4626 * Return a negative value on error, otherwise return the number of bytes used.
4627 * If no subtitle could be decompressed, got_sub_ptr is zero.
4628 * Otherwise, the subtitle is stored in *sub.
4629 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4630 * simplicity, because the performance difference is expect to be negligible
4631 * and reusing a get_buffer written for video codecs would probably perform badly
4632 * due to a potentially very different allocation pattern.
4634 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4635 * and output. This means that for some packets they will not immediately
4636 * produce decoded output and need to be flushed at the end of decoding to get
4637 * all the decoded data. Flushing is done by calling this function with packets
4638 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4639 * returning subtitles. It is safe to flush even those decoders that are not
4640 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4642 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4643 * before packets may be fed to the decoder.
4645 * @param avctx the codec context
4646 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4647 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4648 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4649 * @param[in] avpkt The input AVPacket containing the input buffer.
4651 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4656 * @defgroup lavc_parsing Frame parsing
4660 enum AVPictureStructure {
4661 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4662 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4663 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4664 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4667 typedef struct AVCodecParserContext {
4669 struct AVCodecParser *parser;
4670 int64_t frame_offset; /* offset of the current frame */
4671 int64_t cur_offset; /* current offset
4672 (incremented by each av_parser_parse()) */
4673 int64_t next_frame_offset; /* offset of the next frame */
4675 int pict_type; /* XXX: Put it back in AVCodecContext. */
4677 * This field is used for proper frame duration computation in lavf.
4678 * It signals, how much longer the frame duration of the current frame
4679 * is compared to normal frame duration.
4681 * frame_duration = (1 + repeat_pict) * time_base
4683 * It is used by codecs like H.264 to display telecined material.
4685 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4686 int64_t pts; /* pts of the current frame */
4687 int64_t dts; /* dts of the current frame */
4692 int fetch_timestamp;
4694 #define AV_PARSER_PTS_NB 4
4695 int cur_frame_start_index;
4696 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4697 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4698 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4701 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4702 #define PARSER_FLAG_ONCE 0x0002
4703 /// Set if the parser has a valid file offset
4704 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4705 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4707 int64_t offset; ///< byte offset from starting packet start
4708 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4711 * Set by parser to 1 for key frames and 0 for non-key frames.
4712 * It is initialized to -1, so if the parser doesn't set this flag,
4713 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4718 #if FF_API_CONVERGENCE_DURATION
4720 * @deprecated unused
4722 attribute_deprecated
4723 int64_t convergence_duration;
4726 // Timestamp generation support:
4728 * Synchronization point for start of timestamp generation.
4730 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4733 * For example, this corresponds to presence of H.264 buffering period
4739 * Offset of the current timestamp against last timestamp sync point in
4740 * units of AVCodecContext.time_base.
4742 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4743 * contain a valid timestamp offset.
4745 * Note that the timestamp of sync point has usually a nonzero
4746 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4747 * the next frame after timestamp sync point will be usually 1.
4749 * For example, this corresponds to H.264 cpb_removal_delay.
4751 int dts_ref_dts_delta;
4754 * Presentation delay of current frame in units of AVCodecContext.time_base.
4756 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4757 * contain valid non-negative timestamp delta (presentation time of a frame
4758 * must not lie in the past).
4760 * This delay represents the difference between decoding and presentation
4761 * time of the frame.
4763 * For example, this corresponds to H.264 dpb_output_delay.
4768 * Position of the packet in file.
4770 * Analogous to cur_frame_pts/dts
4772 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4775 * Byte position of currently parsed frame in stream.
4780 * Previous frame byte position.
4785 * Duration of the current frame.
4786 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4787 * For all other types, this is in units of AVCodecContext.time_base.
4791 enum AVFieldOrder field_order;
4794 * Indicate whether a picture is coded as a frame, top field or bottom field.
4796 * For example, H.264 field_pic_flag equal to 0 corresponds to
4797 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4798 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4799 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4801 enum AVPictureStructure picture_structure;
4804 * Picture number incremented in presentation or output order.
4805 * This field may be reinitialized at the first picture of a new sequence.
4807 * For example, this corresponds to H.264 PicOrderCnt.
4809 int output_picture_number;
4812 * Dimensions of the decoded video intended for presentation.
4818 * Dimensions of the coded video.
4824 * The format of the coded data, corresponds to enum AVPixelFormat for video
4825 * and for enum AVSampleFormat for audio.
4827 * Note that a decoder can have considerable freedom in how exactly it
4828 * decodes the data, so the format reported here might be different from the
4829 * one returned by a decoder.
4832 } AVCodecParserContext;
4834 typedef struct AVCodecParser {
4835 int codec_ids[5]; /* several codec IDs are permitted */
4837 int (*parser_init)(AVCodecParserContext *s);
4838 /* This callback never returns an error, a negative value means that
4839 * the frame start was in a previous packet. */
4840 int (*parser_parse)(AVCodecParserContext *s,
4841 AVCodecContext *avctx,
4842 const uint8_t **poutbuf, int *poutbuf_size,
4843 const uint8_t *buf, int buf_size);
4844 void (*parser_close)(AVCodecParserContext *s);
4845 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4846 struct AVCodecParser *next;
4849 AVCodecParser *av_parser_next(const AVCodecParser *c);
4851 void av_register_codec_parser(AVCodecParser *parser);
4852 AVCodecParserContext *av_parser_init(int codec_id);
4857 * @param s parser context.
4858 * @param avctx codec context.
4859 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4860 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4861 * @param buf input buffer.
4862 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4863 * @param pts input presentation timestamp.
4864 * @param dts input decoding timestamp.
4865 * @param pos input byte position in stream.
4866 * @return the number of bytes of the input bitstream used.
4871 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4878 * decode_frame(data, size);
4882 int av_parser_parse2(AVCodecParserContext *s,
4883 AVCodecContext *avctx,
4884 uint8_t **poutbuf, int *poutbuf_size,
4885 const uint8_t *buf, int buf_size,
4886 int64_t pts, int64_t dts,
4890 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4891 * @deprecated use AVBitStreamFilter
4893 int av_parser_change(AVCodecParserContext *s,
4894 AVCodecContext *avctx,
4895 uint8_t **poutbuf, int *poutbuf_size,
4896 const uint8_t *buf, int buf_size, int keyframe);
4897 void av_parser_close(AVCodecParserContext *s);
4905 * @addtogroup lavc_encoding
4910 * Find a registered encoder with a matching codec ID.
4912 * @param id AVCodecID of the requested encoder
4913 * @return An encoder if one was found, NULL otherwise.
4915 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4918 * Find a registered encoder with the specified name.
4920 * @param name name of the requested encoder
4921 * @return An encoder if one was found, NULL otherwise.
4923 AVCodec *avcodec_find_encoder_by_name(const char *name);
4926 * Encode a frame of audio.
4928 * Takes input samples from frame and writes the next output packet, if
4929 * available, to avpkt. The output packet does not necessarily contain data for
4930 * the most recent frame, as encoders can delay, split, and combine input frames
4931 * internally as needed.
4933 * @param avctx codec context
4934 * @param avpkt output AVPacket.
4935 * The user can supply an output buffer by setting
4936 * avpkt->data and avpkt->size prior to calling the
4937 * function, but if the size of the user-provided data is not
4938 * large enough, encoding will fail. If avpkt->data and
4939 * avpkt->size are set, avpkt->destruct must also be set. All
4940 * other AVPacket fields will be reset by the encoder using
4941 * av_init_packet(). If avpkt->data is NULL, the encoder will
4942 * allocate it. The encoder will set avpkt->size to the size
4943 * of the output packet.
4945 * If this function fails or produces no output, avpkt will be
4946 * freed using av_packet_unref().
4947 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4948 * May be NULL when flushing an encoder that has the
4949 * AV_CODEC_CAP_DELAY capability set.
4950 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4951 * can have any number of samples.
4952 * If it is not set, frame->nb_samples must be equal to
4953 * avctx->frame_size for all frames except the last.
4954 * The final frame may be smaller than avctx->frame_size.
4955 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4956 * output packet is non-empty, and to 0 if it is
4957 * empty. If the function returns an error, the
4958 * packet can be assumed to be invalid, and the
4959 * value of got_packet_ptr is undefined and should
4961 * @return 0 on success, negative error code on failure
4963 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4964 const AVFrame *frame, int *got_packet_ptr);
4967 * Encode a frame of video.
4969 * Takes input raw video data from frame and writes the next output packet, if
4970 * available, to avpkt. The output packet does not necessarily contain data for
4971 * the most recent frame, as encoders can delay and reorder input frames
4972 * internally as needed.
4974 * @param avctx codec context
4975 * @param avpkt output AVPacket.
4976 * The user can supply an output buffer by setting
4977 * avpkt->data and avpkt->size prior to calling the
4978 * function, but if the size of the user-provided data is not
4979 * large enough, encoding will fail. All other AVPacket fields
4980 * will be reset by the encoder using av_init_packet(). If
4981 * avpkt->data is NULL, the encoder will allocate it.
4982 * The encoder will set avpkt->size to the size of the
4983 * output packet. The returned data (if any) belongs to the
4984 * caller, he is responsible for freeing it.
4986 * If this function fails or produces no output, avpkt will be
4987 * freed using av_packet_unref().
4988 * @param[in] frame AVFrame containing the raw video data to be encoded.
4989 * May be NULL when flushing an encoder that has the
4990 * AV_CODEC_CAP_DELAY capability set.
4991 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4992 * output packet is non-empty, and to 0 if it is
4993 * empty. If the function returns an error, the
4994 * packet can be assumed to be invalid, and the
4995 * value of got_packet_ptr is undefined and should
4997 * @return 0 on success, negative error code on failure
4999 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
5000 const AVFrame *frame, int *got_packet_ptr);
5002 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
5003 const AVSubtitle *sub);
5010 #if FF_API_AVCODEC_RESAMPLE
5012 * @defgroup lavc_resample Audio resampling
5014 * @deprecated use libswresample instead
5018 struct ReSampleContext;
5019 struct AVResampleContext;
5021 typedef struct ReSampleContext ReSampleContext;
5024 * Initialize audio resampling context.
5026 * @param output_channels number of output channels
5027 * @param input_channels number of input channels
5028 * @param output_rate output sample rate
5029 * @param input_rate input sample rate
5030 * @param sample_fmt_out requested output sample format
5031 * @param sample_fmt_in input sample format
5032 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
5033 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
5034 * @param linear if 1 then the used FIR filter will be linearly interpolated
5035 between the 2 closest, if 0 the closest will be used
5036 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
5037 * @return allocated ReSampleContext, NULL if error occurred
5039 attribute_deprecated
5040 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
5041 int output_rate, int input_rate,
5042 enum AVSampleFormat sample_fmt_out,
5043 enum AVSampleFormat sample_fmt_in,
5044 int filter_length, int log2_phase_count,
5045 int linear, double cutoff);
5047 attribute_deprecated
5048 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
5051 * Free resample context.
5053 * @param s a non-NULL pointer to a resample context previously
5054 * created with av_audio_resample_init()
5056 attribute_deprecated
5057 void audio_resample_close(ReSampleContext *s);
5061 * Initialize an audio resampler.
5062 * Note, if either rate is not an integer then simply scale both rates up so they are.
5063 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
5064 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
5065 * @param linear If 1 then the used FIR filter will be linearly interpolated
5066 between the 2 closest, if 0 the closest will be used
5067 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
5069 attribute_deprecated
5070 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
5073 * Resample an array of samples using a previously configured context.
5074 * @param src an array of unconsumed samples
5075 * @param consumed the number of samples of src which have been consumed are returned here
5076 * @param src_size the number of unconsumed samples available
5077 * @param dst_size the amount of space in samples available in dst
5078 * @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.
5079 * @return the number of samples written in dst or -1 if an error occurred
5081 attribute_deprecated
5082 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
5086 * Compensate samplerate/timestamp drift. The compensation is done by changing
5087 * the resampler parameters, so no audible clicks or similar distortions occur
5088 * @param compensation_distance distance in output samples over which the compensation should be performed
5089 * @param sample_delta number of output samples which should be output less
5091 * example: av_resample_compensate(c, 10, 500)
5092 * here instead of 510 samples only 500 samples would be output
5094 * note, due to rounding the actual compensation might be slightly different,
5095 * especially if the compensation_distance is large and the in_rate used during init is small
5097 attribute_deprecated
5098 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
5099 attribute_deprecated
5100 void av_resample_close(struct AVResampleContext *c);
5107 #if FF_API_AVPICTURE
5109 * @addtogroup lavc_picture
5114 * @deprecated unused
5116 attribute_deprecated
5117 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5120 * @deprecated unused
5122 attribute_deprecated
5123 void avpicture_free(AVPicture *picture);
5126 * @deprecated use av_image_fill_arrays() instead.
5128 attribute_deprecated
5129 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5130 enum AVPixelFormat pix_fmt, int width, int height);
5133 * @deprecated use av_image_copy_to_buffer() instead.
5135 attribute_deprecated
5136 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
5137 int width, int height,
5138 unsigned char *dest, int dest_size);
5141 * @deprecated use av_image_get_buffer_size() instead.
5143 attribute_deprecated
5144 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
5147 * @deprecated av_image_copy() instead.
5149 attribute_deprecated
5150 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5151 enum AVPixelFormat pix_fmt, int width, int height);
5154 * @deprecated unused
5156 attribute_deprecated
5157 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5158 enum AVPixelFormat pix_fmt, int top_band, int left_band);
5161 * @deprecated unused
5163 attribute_deprecated
5164 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5165 int padtop, int padbottom, int padleft, int padright, int *color);
5173 * @defgroup lavc_misc Utility functions
5176 * Miscellaneous utility functions related to both encoding and decoding
5182 * @defgroup lavc_misc_pixfmt Pixel formats
5184 * Functions for working with pixel formats.
5189 * Utility function to access log2_chroma_w log2_chroma_h from
5190 * the pixel format AVPixFmtDescriptor.
5192 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
5193 * for one that returns a failure code and continues in case of invalid
5196 * @param[in] pix_fmt the pixel format
5197 * @param[out] h_shift store log2_chroma_w
5198 * @param[out] v_shift store log2_chroma_h
5200 * @see av_pix_fmt_get_chroma_sub_sample
5203 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5206 * Return a value representing the fourCC code associated to the
5207 * pixel format pix_fmt, or 0 if no associated fourCC code can be
5210 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
5213 * @deprecated see av_get_pix_fmt_loss()
5215 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5219 * Find the best pixel format to convert to given a certain source pixel
5220 * format. When converting from one pixel format to another, information loss
5221 * may occur. For example, when converting from RGB24 to GRAY, the color
5222 * information will be lost. Similarly, other losses occur when converting from
5223 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5224 * the given pixel formats should be used to suffer the least amount of loss.
5225 * The pixel formats from which it chooses one, are determined by the
5226 * pix_fmt_list parameter.
5229 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5230 * @param[in] src_pix_fmt source pixel format
5231 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5232 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5233 * @return The best pixel format to convert to or -1 if none was found.
5235 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5236 enum AVPixelFormat src_pix_fmt,
5237 int has_alpha, int *loss_ptr);
5240 * @deprecated see av_find_best_pix_fmt_of_2()
5242 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5243 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5245 attribute_deprecated
5246 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
5247 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
5248 enum AVPixelFormat src_pix_fmt,
5249 int has_alpha, int *loss_ptr);
5251 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5252 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5256 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5262 #if FF_API_SET_DIMENSIONS
5264 * @deprecated this function is not supposed to be used from outside of lavc
5266 attribute_deprecated
5267 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
5271 * Put a string representing the codec tag codec_tag in buf.
5273 * @param buf buffer to place codec tag in
5274 * @param buf_size size in bytes of buf
5275 * @param codec_tag codec tag to assign
5276 * @return the length of the string that would have been generated if
5277 * enough space had been available, excluding the trailing null
5279 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5281 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5284 * Return a name for the specified profile, if available.
5286 * @param codec the codec that is searched for the given profile
5287 * @param profile the profile value for which a name is requested
5288 * @return A name for the profile if found, NULL otherwise.
5290 const char *av_get_profile_name(const AVCodec *codec, int profile);
5293 * Return a name for the specified profile, if available.
5295 * @param codec_id the ID of the codec to which the requested profile belongs
5296 * @param profile the profile value for which a name is requested
5297 * @return A name for the profile if found, NULL otherwise.
5299 * @note unlike av_get_profile_name(), which searches a list of profiles
5300 * supported by a specific decoder or encoder implementation, this
5301 * function searches the list of profiles from the AVCodecDescriptor
5303 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
5305 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5306 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5307 //FIXME func typedef
5310 * Fill AVFrame audio data and linesize pointers.
5312 * The buffer buf must be a preallocated buffer with a size big enough
5313 * to contain the specified samples amount. The filled AVFrame data
5314 * pointers will point to this buffer.
5316 * AVFrame extended_data channel pointers are allocated if necessary for
5319 * @param frame the AVFrame
5320 * frame->nb_samples must be set prior to calling the
5321 * function. This function fills in frame->data,
5322 * frame->extended_data, frame->linesize[0].
5323 * @param nb_channels channel count
5324 * @param sample_fmt sample format
5325 * @param buf buffer to use for frame data
5326 * @param buf_size size of buffer
5327 * @param align plane size sample alignment (0 = default)
5328 * @return >=0 on success, negative error code on failure
5329 * @todo return the size in bytes required to store the samples in
5330 * case of success, at the next libavutil bump
5332 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5333 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5334 int buf_size, int align);
5337 * Reset the internal decoder state / flush internal buffers. Should be called
5338 * e.g. when seeking or when switching to a different stream.
5340 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5341 * this invalidates the frames previously returned from the decoder. When
5342 * refcounted frames are used, the decoder just releases any references it might
5343 * keep internally, but the caller's reference remains valid.
5345 void avcodec_flush_buffers(AVCodecContext *avctx);
5348 * Return codec bits per sample.
5350 * @param[in] codec_id the codec
5351 * @return Number of bits per sample or zero if unknown for the given codec.
5353 int av_get_bits_per_sample(enum AVCodecID codec_id);
5356 * Return the PCM codec associated with a sample format.
5357 * @param be endianness, 0 for little, 1 for big,
5358 * -1 (or anything else) for native
5359 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5361 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5364 * Return codec bits per sample.
5365 * Only return non-zero if the bits per sample is exactly correct, not an
5368 * @param[in] codec_id the codec
5369 * @return Number of bits per sample or zero if unknown for the given codec.
5371 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5374 * Return audio frame duration.
5376 * @param avctx codec context
5377 * @param frame_bytes size of the frame, or 0 if unknown
5378 * @return frame duration, in samples, if known. 0 if not able to
5381 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5384 * This function is the same as av_get_audio_frame_duration(), except it works
5385 * with AVCodecParameters instead of an AVCodecContext.
5387 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
5390 typedef struct AVBitStreamFilterContext {
5392 struct AVBitStreamFilter *filter;
5393 AVCodecParserContext *parser;
5394 struct AVBitStreamFilterContext *next;
5396 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5397 * Not for access by library users.
5400 } AVBitStreamFilterContext;
5403 typedef struct AVBitStreamFilter {
5406 int (*filter)(AVBitStreamFilterContext *bsfc,
5407 AVCodecContext *avctx, const char *args,
5408 uint8_t **poutbuf, int *poutbuf_size,
5409 const uint8_t *buf, int buf_size, int keyframe);
5410 void (*close)(AVBitStreamFilterContext *bsfc);
5411 struct AVBitStreamFilter *next;
5412 } AVBitStreamFilter;
5415 * Register a bitstream filter.
5417 * The filter will be accessible to the application code through
5418 * av_bitstream_filter_next() or can be directly initialized with
5419 * av_bitstream_filter_init().
5421 * @see avcodec_register_all()
5423 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5426 * Create and initialize a bitstream filter context given a bitstream
5429 * The returned context must be freed with av_bitstream_filter_close().
5431 * @param name the name of the bitstream filter
5432 * @return a bitstream filter context if a matching filter was found
5433 * and successfully initialized, NULL otherwise
5435 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5440 * This function filters the buffer buf with size buf_size, and places the
5441 * filtered buffer in the buffer pointed to by poutbuf.
5443 * The output buffer must be freed by the caller.
5445 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5446 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5447 * If specified, this must point to the encoder context of the
5448 * output stream the packet is sent to.
5449 * @param args arguments which specify the filter configuration, may be NULL
5450 * @param poutbuf pointer which is updated to point to the filtered buffer
5451 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5452 * @param buf buffer containing the data to filter
5453 * @param buf_size size in bytes of buf
5454 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5455 * @return >= 0 in case of success, or a negative error code in case of failure
5457 * If the return value is positive, an output buffer is allocated and
5458 * is available in *poutbuf, and is distinct from the input buffer.
5460 * If the return value is 0, the output buffer is not allocated and
5461 * should be considered identical to the input buffer, or in case
5462 * *poutbuf was set it points to the input buffer (not necessarily to
5463 * its starting address). A special case is if *poutbuf was set to NULL and
5464 * *poutbuf_size was set to 0, which indicates the packet should be dropped.
5466 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5467 AVCodecContext *avctx, const char *args,
5468 uint8_t **poutbuf, int *poutbuf_size,
5469 const uint8_t *buf, int buf_size, int keyframe);
5472 * Release bitstream filter context.
5474 * @param bsf the bitstream filter context created with
5475 * av_bitstream_filter_init(), can be NULL
5477 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5480 * If f is NULL, return the first registered bitstream filter,
5481 * if f is non-NULL, return the next registered bitstream filter
5482 * after f, or NULL if f is the last one.
5484 * This function can be used to iterate over all registered bitstream
5487 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5492 * Same behaviour av_fast_malloc but the buffer has additional
5493 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5495 * In addition the whole buffer will initially and after resizes
5496 * be 0-initialized so that no uninitialized data will ever appear.
5498 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5501 * Same behaviour av_fast_padded_malloc except that buffer will always
5502 * be 0-initialized after call.
5504 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5507 * Encode extradata length to a buffer. Used by xiph codecs.
5509 * @param s buffer to write to; must be at least (v/255+1) bytes long
5510 * @param v size of extradata in bytes
5511 * @return number of bytes written to the buffer.
5513 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5515 #if FF_API_MISSING_SAMPLE
5517 * Log a generic warning message about a missing feature. This function is
5518 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5519 * only, and would normally not be used by applications.
5520 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5521 * a pointer to an AVClass struct
5522 * @param[in] feature string containing the name of the missing feature
5523 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5524 * If want_sample is non-zero, additional verbage will be added to the log
5525 * message which tells the user how to report samples to the development
5527 * @deprecated Use avpriv_report_missing_feature() instead.
5529 attribute_deprecated
5530 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5533 * Log a generic warning message asking for a sample. This function is
5534 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5535 * only, and would normally not be used by applications.
5536 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5537 * a pointer to an AVClass struct
5538 * @param[in] msg string containing an optional message, or NULL if no message
5539 * @deprecated Use avpriv_request_sample() instead.
5541 attribute_deprecated
5542 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5543 #endif /* FF_API_MISSING_SAMPLE */
5546 * Register the hardware accelerator hwaccel.
5548 void av_register_hwaccel(AVHWAccel *hwaccel);
5551 * If hwaccel is NULL, returns the first registered hardware accelerator,
5552 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5553 * after hwaccel, or NULL if hwaccel is the last one.
5555 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5559 * Lock operation used by lockmgr
5562 AV_LOCK_CREATE, ///< Create a mutex
5563 AV_LOCK_OBTAIN, ///< Lock the mutex
5564 AV_LOCK_RELEASE, ///< Unlock the mutex
5565 AV_LOCK_DESTROY, ///< Free mutex resources
5569 * Register a user provided lock manager supporting the operations
5570 * specified by AVLockOp. The "mutex" argument to the function points
5571 * to a (void *) where the lockmgr should store/get a pointer to a user
5572 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5573 * value left by the last call for all other ops. If the lock manager is
5574 * unable to perform the op then it should leave the mutex in the same
5575 * state as when it was called and return a non-zero value. However,
5576 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5577 * have been successfully destroyed. If av_lockmgr_register succeeds
5578 * it will return a non-negative value, if it fails it will return a
5579 * negative value and destroy all mutex and unregister all callbacks.
5580 * av_lockmgr_register is not thread-safe, it must be called from a
5581 * single thread before any calls which make use of locking are used.
5583 * @param cb User defined callback. av_lockmgr_register invokes calls
5584 * to this callback and the previously registered callback.
5585 * The callback will be used to create more than one mutex
5586 * each of which must be backed by its own underlying locking
5587 * mechanism (i.e. do not use a single static object to
5588 * implement your lock manager). If cb is set to NULL the
5589 * lockmgr will be unregistered.
5591 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5594 * Get the type of the given codec.
5596 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5599 * Get the name of a codec.
5600 * @return a static string identifying the codec; never NULL
5602 const char *avcodec_get_name(enum AVCodecID id);
5605 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5606 * with no corresponding avcodec_close()), 0 otherwise.
5608 int avcodec_is_open(AVCodecContext *s);
5611 * @return a non-zero number if codec is an encoder, zero otherwise
5613 int av_codec_is_encoder(const AVCodec *codec);
5616 * @return a non-zero number if codec is a decoder, zero otherwise
5618 int av_codec_is_decoder(const AVCodec *codec);
5621 * @return descriptor for given codec ID or NULL if no descriptor exists.
5623 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5626 * Iterate over all codec descriptors known to libavcodec.
5628 * @param prev previous descriptor. NULL to get the first descriptor.
5630 * @return next descriptor or NULL after the last descriptor
5632 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5635 * @return codec descriptor with the given name or NULL if no such descriptor
5638 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5641 * Allocate a CPB properties structure and initialize its fields to default
5644 * @param size if non-NULL, the size of the allocated struct will be written
5645 * here. This is useful for embedding it in side data.
5647 * @return the newly allocated struct or NULL on failure
5649 AVCPBProperties *av_cpb_properties_alloc(size_t *size);
5655 #endif /* AVCODEC_AVCODEC_H */