2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
46 * @defgroup libavc Encoding/Decoding Library
49 * @defgroup lavc_decoding Decoding
53 * @defgroup lavc_encoding Encoding
57 * @defgroup lavc_codec Codecs
59 * @defgroup lavc_codec_native Native Codecs
62 * @defgroup lavc_codec_wrappers External library wrappers
65 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
69 * @defgroup lavc_internal Internal
77 * @defgroup lavc_core Core functions/structures.
80 * Basic definitions, functions for querying libavcodec capabilities,
81 * allocating core structures, etc.
87 * Identify the syntax and semantics of the bitstream.
88 * The principle is roughly:
89 * Two decoders with the same ID can decode the same streams.
90 * Two encoders with the same ID can encode compatible streams.
91 * There may be slight deviations from the principle due to implementation
94 * If you add a codec ID to this list, add it so that
95 * 1. no value of a existing codec ID changes (that would break ABI),
96 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
97 * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts.
99 * After adding new codec IDs, do not forget to add an entry to the codec
100 * descriptor list and bump libavcodec minor version.
106 AV_CODEC_ID_MPEG1VIDEO,
107 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
109 AV_CODEC_ID_MPEG2VIDEO_XVMC,
110 #endif /* FF_API_XVMC */
121 AV_CODEC_ID_RAWVIDEO,
122 AV_CODEC_ID_MSMPEG4V1,
123 AV_CODEC_ID_MSMPEG4V2,
124 AV_CODEC_ID_MSMPEG4V3,
147 AV_CODEC_ID_INTERPLAY_VIDEO,
154 AV_CODEC_ID_MSVIDEO1,
159 AV_CODEC_ID_TRUEMOTION1,
160 AV_CODEC_ID_VMDVIDEO,
185 AV_CODEC_ID_TRUEMOTION2,
191 AV_CODEC_ID_SMACKVIDEO,
196 AV_CODEC_ID_JPEG2000,
202 AV_CODEC_ID_DSICINVIDEO,
203 AV_CODEC_ID_TIERTEXSEQVIDEO,
211 AV_CODEC_ID_BETHSOFTVID,
223 AV_CODEC_ID_ESCAPE124,
227 AV_CODEC_ID_MOTIONPIXELS,
239 AV_CODEC_ID_FLASHSV2,
240 AV_CODEC_ID_CDGRAPHICS,
243 AV_CODEC_ID_BINKVIDEO,
244 AV_CODEC_ID_IFF_ILBM,
245 AV_CODEC_ID_IFF_BYTERUN1,
251 AV_CODEC_ID_A64_MULTI,
252 AV_CODEC_ID_A64_MULTI5,
255 AV_CODEC_ID_LAGARITH,
259 AV_CODEC_ID_WMV3IMAGE,
260 AV_CODEC_ID_VC1IMAGE,
262 AV_CODEC_ID_BMV_VIDEO,
269 AV_CODEC_ID_ZEROCODEC,
278 AV_CODEC_ID_ESCAPE130_DEPRECATED,
279 AV_CODEC_ID_G2M_DEPRECATED,
280 AV_CODEC_ID_WEBP_DEPRECATED,
281 AV_CODEC_ID_HNM4_VIDEO,
282 AV_CODEC_ID_HEVC_DEPRECATED,
284 AV_CODEC_ID_ALIAS_PIX,
285 AV_CODEC_ID_BRENDER_PIX_DEPRECATED,
286 AV_CODEC_ID_PAF_VIDEO_DEPRECATED,
287 AV_CODEC_ID_EXR_DEPRECATED,
288 AV_CODEC_ID_VP7_DEPRECATED,
289 AV_CODEC_ID_SANM_DEPRECATED,
290 AV_CODEC_ID_SGIRLE_DEPRECATED,
291 AV_CODEC_ID_MVC1_DEPRECATED,
292 AV_CODEC_ID_MVC2_DEPRECATED,
299 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
300 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
301 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
302 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
303 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
305 AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
306 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
307 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
308 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
309 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
310 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
311 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
312 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
313 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
314 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
315 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
316 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
317 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
318 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
319 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
320 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
321 AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'),
322 AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'),
323 AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'),
324 AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'),
325 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
326 AV_CODEC_ID_VP7 = MKBETAG('V','P','7','0'),
327 AV_CODEC_ID_APNG = MKBETAG('A','P','N','G'),
329 /* various PCM "codecs" */
330 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
331 AV_CODEC_ID_PCM_S16LE = 0x10000,
332 AV_CODEC_ID_PCM_S16BE,
333 AV_CODEC_ID_PCM_U16LE,
334 AV_CODEC_ID_PCM_U16BE,
337 AV_CODEC_ID_PCM_MULAW,
338 AV_CODEC_ID_PCM_ALAW,
339 AV_CODEC_ID_PCM_S32LE,
340 AV_CODEC_ID_PCM_S32BE,
341 AV_CODEC_ID_PCM_U32LE,
342 AV_CODEC_ID_PCM_U32BE,
343 AV_CODEC_ID_PCM_S24LE,
344 AV_CODEC_ID_PCM_S24BE,
345 AV_CODEC_ID_PCM_U24LE,
346 AV_CODEC_ID_PCM_U24BE,
347 AV_CODEC_ID_PCM_S24DAUD,
348 AV_CODEC_ID_PCM_ZORK,
349 AV_CODEC_ID_PCM_S16LE_PLANAR,
351 AV_CODEC_ID_PCM_F32BE,
352 AV_CODEC_ID_PCM_F32LE,
353 AV_CODEC_ID_PCM_F64BE,
354 AV_CODEC_ID_PCM_F64LE,
355 AV_CODEC_ID_PCM_BLURAY,
358 AV_CODEC_ID_PCM_S8_PLANAR,
359 AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED,
360 AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED,
361 AV_CODEC_ID_PCM_S16BE_PLANAR_DEPRECATED,
362 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
363 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
364 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
366 /* various ADPCM codecs */
367 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
368 AV_CODEC_ID_ADPCM_IMA_WAV,
369 AV_CODEC_ID_ADPCM_IMA_DK3,
370 AV_CODEC_ID_ADPCM_IMA_DK4,
371 AV_CODEC_ID_ADPCM_IMA_WS,
372 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
373 AV_CODEC_ID_ADPCM_MS,
374 AV_CODEC_ID_ADPCM_4XM,
375 AV_CODEC_ID_ADPCM_XA,
376 AV_CODEC_ID_ADPCM_ADX,
377 AV_CODEC_ID_ADPCM_EA,
378 AV_CODEC_ID_ADPCM_G726,
379 AV_CODEC_ID_ADPCM_CT,
380 AV_CODEC_ID_ADPCM_SWF,
381 AV_CODEC_ID_ADPCM_YAMAHA,
382 AV_CODEC_ID_ADPCM_SBPRO_4,
383 AV_CODEC_ID_ADPCM_SBPRO_3,
384 AV_CODEC_ID_ADPCM_SBPRO_2,
385 AV_CODEC_ID_ADPCM_THP,
386 AV_CODEC_ID_ADPCM_IMA_AMV,
387 AV_CODEC_ID_ADPCM_EA_R1,
388 AV_CODEC_ID_ADPCM_EA_R3,
389 AV_CODEC_ID_ADPCM_EA_R2,
390 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
391 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
392 AV_CODEC_ID_ADPCM_EA_XAS,
393 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
394 AV_CODEC_ID_ADPCM_IMA_ISS,
395 AV_CODEC_ID_ADPCM_G722,
396 AV_CODEC_ID_ADPCM_IMA_APC,
397 AV_CODEC_ID_ADPCM_VIMA_DEPRECATED,
398 AV_CODEC_ID_ADPCM_VIMA = MKBETAG('V','I','M','A'),
399 #if FF_API_VIMA_DECODER
400 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
402 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
403 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
404 AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '),
405 AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '),
406 AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'),
407 AV_CODEC_ID_ADPCM_THP_LE = MKBETAG('T','H','P','L'),
410 AV_CODEC_ID_AMR_NB = 0x12000,
413 /* RealAudio codecs*/
414 AV_CODEC_ID_RA_144 = 0x13000,
417 /* various DPCM codecs */
418 AV_CODEC_ID_ROQ_DPCM = 0x14000,
419 AV_CODEC_ID_INTERPLAY_DPCM,
420 AV_CODEC_ID_XAN_DPCM,
421 AV_CODEC_ID_SOL_DPCM,
424 AV_CODEC_ID_MP2 = 0x15000,
425 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
435 AV_CODEC_ID_VMDAUDIO,
441 AV_CODEC_ID_WESTWOOD_SND1,
442 AV_CODEC_ID_GSM, ///< as in Berlin toast format
445 AV_CODEC_ID_TRUESPEECH,
447 AV_CODEC_ID_SMACKAUDIO,
450 AV_CODEC_ID_DSICINAUDIO,
452 AV_CODEC_ID_MUSEPACK7,
454 AV_CODEC_ID_GSM_MS, /* as found in WAV */
460 AV_CODEC_ID_NELLYMOSER,
461 AV_CODEC_ID_MUSEPACK8,
463 AV_CODEC_ID_WMAVOICE,
465 AV_CODEC_ID_WMALOSSLESS,
474 AV_CODEC_ID_BINKAUDIO_RDFT,
475 AV_CODEC_ID_BINKAUDIO_DCT,
476 AV_CODEC_ID_AAC_LATM,
481 AV_CODEC_ID_8SVX_EXP,
482 AV_CODEC_ID_8SVX_FIB,
483 AV_CODEC_ID_BMV_AUDIO,
487 AV_CODEC_ID_OPUS_DEPRECATED,
488 AV_CODEC_ID_COMFORT_NOISE,
489 AV_CODEC_ID_TAK_DEPRECATED,
490 AV_CODEC_ID_METASOUND,
491 AV_CODEC_ID_PAF_AUDIO_DEPRECATED,
494 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
495 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
496 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
497 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
498 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
499 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
500 AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
501 AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
502 AV_CODEC_ID_DSD_LSBF = MKBETAG('D','S','D','L'),
503 AV_CODEC_ID_DSD_MSBF = MKBETAG('D','S','D','M'),
504 AV_CODEC_ID_DSD_LSBF_PLANAR = MKBETAG('D','S','D','1'),
505 AV_CODEC_ID_DSD_MSBF_PLANAR = MKBETAG('D','S','D','8'),
506 AV_CODEC_ID_4GV = MKBETAG('s','4','g','v'),
508 /* subtitle codecs */
509 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
510 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
511 AV_CODEC_ID_DVB_SUBTITLE,
512 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
515 AV_CODEC_ID_MOV_TEXT,
516 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
517 AV_CODEC_ID_DVB_TELETEXT,
519 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
520 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
521 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
522 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
523 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
524 AV_CODEC_ID_STL = MKBETAG('S','p','T','L'),
525 AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
526 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
527 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
528 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
529 AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
530 AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
531 AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
532 AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska
533 AV_CODEC_ID_HDMV_TEXT_SUBTITLE = MKBETAG('B','D','T','X'),
535 /* other specific kind of codecs (generally used for attachments) */
536 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
537 AV_CODEC_ID_TTF = 0x18000,
538 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
539 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
540 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
541 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
542 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
543 AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
544 AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'),
545 AV_CODEC_ID_BIN_DATA = MKBETAG('D','A','T','A'),
548 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
550 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
551 * stream (only used by libavformat) */
552 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
553 * stream (only used by libavformat) */
554 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
557 #include "old_codec_ids.h"
562 * This struct describes the properties of a single codec described by an
564 * @see avcodec_descriptor_get()
566 typedef struct AVCodecDescriptor {
568 enum AVMediaType type;
570 * Name of the codec described by this descriptor. It is non-empty and
571 * unique for each codec descriptor. It should contain alphanumeric
572 * characters and '_' only.
576 * A more descriptive name for this codec. May be NULL.
578 const char *long_name;
580 * Codec properties, a combination of AV_CODEC_PROP_* flags.
585 * MIME type(s) associated with the codec.
586 * May be NULL; if not, a NULL-terminated array of MIME types.
587 * The first item is always non-NULL and is the preferred MIME type.
589 const char *const *mime_types;
593 * Codec uses only intra compression.
596 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
598 * Codec supports lossy compression. Audio and video codecs only.
599 * @note a codec may support both lossy and lossless
602 #define AV_CODEC_PROP_LOSSY (1 << 1)
604 * Codec supports lossless compression. Audio and video codecs only.
606 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
608 * Codec supports frame reordering. That is, the coded order (the order in which
609 * the encoded packets are output by the encoders / stored / input to the
610 * decoders) may be different from the presentation order of the corresponding
613 * For codecs that do not have this property set, PTS and DTS should always be
616 #define AV_CODEC_PROP_REORDER (1 << 3)
618 * Subtitle codec is bitmap based
619 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
621 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
623 * Subtitle codec is text based.
624 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
626 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
629 * @ingroup lavc_decoding
630 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
631 * This is mainly needed because some optimized bitstream readers read
632 * 32 or 64 bit at once and could read over the end.<br>
633 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
634 * MPEG bitstreams could cause overread and segfault.
636 #define AV_INPUT_BUFFER_PADDING_SIZE 32
639 * @ingroup lavc_encoding
640 * minimum encoding buffer size
641 * Used to avoid some checks during header writing.
643 #define AV_INPUT_BUFFER_MIN_SIZE 16384
645 #if FF_API_WITHOUT_PREFIX
647 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
649 #define FF_INPUT_BUFFER_PADDING_SIZE 32
652 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
654 #define FF_MIN_BUFFER_SIZE 16384
655 #endif /* FF_API_WITHOUT_PREFIX */
658 * @ingroup lavc_encoding
659 * motion estimation type.
660 * @deprecated use codec private option instead
662 #if FF_API_MOTION_EST
664 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
668 ME_EPZS, ///< enhanced predictive zonal search
669 ME_X1, ///< reserved for experiments
670 ME_HEX, ///< hexagon based search
671 ME_UMH, ///< uneven multi-hexagon search
672 ME_TESA, ///< transformed exhaustive search algorithm
673 ME_ITER=50, ///< iterative search
678 * @ingroup lavc_decoding
681 /* We leave some space between them for extensions (drop some
682 * keyframes for intra-only or drop just some bidir frames). */
683 AVDISCARD_NONE =-16, ///< discard nothing
684 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
685 AVDISCARD_NONREF = 8, ///< discard all non reference
686 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
687 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
688 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
689 AVDISCARD_ALL = 48, ///< discard all
692 enum AVAudioServiceType {
693 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
694 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
695 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
696 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
697 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
698 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
699 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
700 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
701 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
702 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
706 * @ingroup lavc_encoding
708 typedef struct RcOverride{
711 int qscale; // If this is 0 then quality_factor will be used instead.
712 float quality_factor;
715 #if FF_API_MAX_BFRAMES
717 * @deprecated there is no libavcodec-wide limit on the number of B-frames
719 #define FF_MAX_B_FRAMES 16
723 These flags can be passed in AVCodecContext.flags before initialization.
724 Note: Not everything is supported yet.
728 * Allow decoders to produce frames with data planes that are not aligned
729 * to CPU requirements (e.g. due to cropping).
731 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
735 #define AV_CODEC_FLAG_QSCALE (1 << 1)
737 * 4 MV per MB allowed / advanced prediction for H.263.
739 #define AV_CODEC_FLAG_4MV (1 << 2)
741 * Output even those frames that might be corrupted.
743 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
747 #define AV_CODEC_FLAG_QPEL (1 << 4)
749 * Use internal 2pass ratecontrol in first pass mode.
751 #define AV_CODEC_FLAG_PASS1 (1 << 9)
753 * Use internal 2pass ratecontrol in second pass mode.
755 #define AV_CODEC_FLAG_PASS2 (1 << 10)
759 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
761 * Only decode/encode grayscale.
763 #define AV_CODEC_FLAG_GRAY (1 << 13)
765 * error[?] variables will be set during encoding.
767 #define AV_CODEC_FLAG_PSNR (1 << 15)
769 * Input bitstream might be truncated at a random location
770 * instead of only at frame boundaries.
772 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
774 * Use interlaced DCT.
776 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
780 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
782 * Place global headers in extradata instead of every keyframe.
784 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
786 * Use only bitexact stuff (except (I)DCT).
788 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
789 /* Fx : Flag for h263+ extra options */
791 * H.263 advanced intra coding / MPEG-4 AC prediction
793 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
795 * interlaced motion estimation
797 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
799 * Allow non spec compliant speedup tricks.
801 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
803 #define AV_CODEC_FLAG2_FAST (1 << 0)
805 * Skip bitstream encoding.
807 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
809 * Place global headers at every keyframe instead of in extradata.
811 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
814 * timecode is in drop frame format. DEPRECATED!!!!
816 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
819 * Input bitstream might be truncated at a packet boundaries
820 * instead of only at frame boundaries.
822 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
824 * Discard cropping information from SPS.
826 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
829 * Show all frames before the first keyframe
831 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
833 * Export motion vectors through frame side data
835 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
837 * Do not skip samples and export skip information as frame side data
839 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
841 /* Unsupported options :
842 * Syntax Arithmetic coding (SAC)
843 * Reference Picture Selection
844 * Independent Segment Decoding */
846 /* codec capabilities */
849 * Decoder can use draw_horiz_band callback.
851 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
853 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
854 * If not set, it might not use get_buffer() at all or use operations that
855 * assume the buffer was allocated by avcodec_default_get_buffer.
857 #define AV_CODEC_CAP_DR1 (1 << 1)
858 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
860 * Encoder or decoder requires flushing with NULL input at the end in order to
861 * give the complete and correct output.
863 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
864 * with NULL data. The user can still send NULL data to the public encode
865 * or decode function, but libavcodec will not pass it along to the codec
866 * unless this flag is set.
869 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
870 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
874 * The encoder needs to be fed with NULL data at the end of encoding until the
875 * encoder no longer returns data.
877 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
878 * flag also means that the encoder must set the pts and duration for
879 * each output packet. If this flag is not set, the pts and duration will
880 * be determined by libavcodec from the input frame.
882 #define AV_CODEC_CAP_DELAY (1 << 5)
884 * Codec can be fed a final frame with a smaller size.
885 * This can be used to prevent truncation of the last audio samples.
887 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
891 * Codec can export data for HW decoding (VDPAU).
893 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
897 * Codec can output multiple frames per AVPacket
898 * Normally demuxers return one frame at a time, demuxers which do not do
899 * are connected to a parser to split what they return into proper frames.
900 * This flag is reserved to the very rare category of codecs which have a
901 * bitstream that cannot be split into frames without timeconsuming
902 * operations like full decoding. Demuxers carring such bitstreams thus
903 * may return multiple frames in a packet. This has many disadvantages like
904 * prohibiting stream copy in many cases thus it should only be considered
907 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
909 * Codec is experimental and is thus avoided in favor of non experimental
912 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
914 * Codec should fill in channel configuration and samplerate instead of container
916 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
918 * Codec supports frame-level multithreading.
920 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
922 * Codec supports slice-based (or partition-based) multithreading.
924 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
926 * Codec supports changed parameters at any point.
928 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
930 * Codec supports avctx->thread_count == 0 (auto).
932 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
934 * Audio encoder supports receiving a different number of samples in each call.
936 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
938 * Codec is intra only.
940 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
944 #define AV_CODEC_CAP_LOSSLESS 0x80000000
947 #if FF_API_WITHOUT_PREFIX
949 * Allow decoders to produce frames with data planes that are not aligned
950 * to CPU requirements (e.g. due to cropping).
952 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
953 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
954 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
955 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
956 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
959 * @deprecated use the "gmc" private option of the libxvid encoder
961 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
965 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
968 #define CODEC_FLAG_MV0 0x0040
970 #if FF_API_INPUT_PRESERVED
972 * @deprecated passing reference-counted frames to the encoders replaces this
975 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
977 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
978 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
979 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
982 * @deprecated edges are not used/required anymore. I.e. this flag is now always
985 #define CODEC_FLAG_EMU_EDGE 0x4000
987 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
988 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
990 #if FF_API_NORMALIZE_AQP
992 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
995 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
997 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
998 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
999 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
1000 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
1001 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
1002 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
1003 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
1004 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
1005 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1006 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1007 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1008 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1009 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1011 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1012 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1013 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1014 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1016 /* Unsupported options :
1017 * Syntax Arithmetic coding (SAC)
1018 * Reference Picture Selection
1019 * Independent Segment Decoding */
1021 /* codec capabilities */
1023 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1025 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1026 * If not set, it might not use get_buffer() at all or use operations that
1027 * assume the buffer was allocated by avcodec_default_get_buffer.
1029 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1030 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1032 /* Codec can export data for HW decoding. This flag indicates that
1033 * the codec would call get_format() with list that might contain HW accelerated
1034 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1035 * including raw image format.
1036 * The application can use the passed context to determine bitstream version,
1037 * chroma format, resolution etc.
1039 #define CODEC_CAP_HWACCEL 0x0010
1040 #endif /* FF_API_XVMC */
1042 * Encoder or decoder requires flushing with NULL input at the end in order to
1043 * give the complete and correct output.
1045 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1046 * with NULL data. The user can still send NULL data to the public encode
1047 * or decode function, but libavcodec will not pass it along to the codec
1048 * unless this flag is set.
1051 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1052 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1056 * The encoder needs to be fed with NULL data at the end of encoding until the
1057 * encoder no longer returns data.
1059 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1060 * flag also means that the encoder must set the pts and duration for
1061 * each output packet. If this flag is not set, the pts and duration will
1062 * be determined by libavcodec from the input frame.
1064 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1066 * Codec can be fed a final frame with a smaller size.
1067 * This can be used to prevent truncation of the last audio samples.
1069 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1070 #if FF_API_CAP_VDPAU
1072 * Codec can export data for HW decoding (VDPAU).
1074 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1077 * Codec can output multiple frames per AVPacket
1078 * Normally demuxers return one frame at a time, demuxers which do not do
1079 * are connected to a parser to split what they return into proper frames.
1080 * This flag is reserved to the very rare category of codecs which have a
1081 * bitstream that cannot be split into frames without timeconsuming
1082 * operations like full decoding. Demuxers carring such bitstreams thus
1083 * may return multiple frames in a packet. This has many disadvantages like
1084 * prohibiting stream copy in many cases thus it should only be considered
1087 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1089 * Codec is experimental and is thus avoided in favor of non experimental
1092 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1094 * Codec should fill in channel configuration and samplerate instead of container
1096 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1097 #if FF_API_NEG_LINESIZES
1099 * @deprecated no codecs use this capability
1101 #define CODEC_CAP_NEG_LINESIZES 0x0800
1104 * Codec supports frame-level multithreading.
1106 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1108 * Codec supports slice-based (or partition-based) multithreading.
1110 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1112 * Codec supports changed parameters at any point.
1114 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1116 * Codec supports avctx->thread_count == 0 (auto).
1118 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1120 * Audio encoder supports receiving a different number of samples in each call.
1122 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1124 * Codec is intra only.
1126 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1128 * Codec is lossless.
1130 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1133 * HWAccel is experimental and is thus avoided in favor of non experimental
1136 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1137 #endif /* FF_API_WITHOUT_PREFIX */
1140 //The following defines may change, don't expect compatibility if you use them.
1141 #define MB_TYPE_INTRA4x4 0x0001
1142 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1143 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1144 #define MB_TYPE_16x16 0x0008
1145 #define MB_TYPE_16x8 0x0010
1146 #define MB_TYPE_8x16 0x0020
1147 #define MB_TYPE_8x8 0x0040
1148 #define MB_TYPE_INTERLACED 0x0080
1149 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1150 #define MB_TYPE_ACPRED 0x0200
1151 #define MB_TYPE_GMC 0x0400
1152 #define MB_TYPE_SKIP 0x0800
1153 #define MB_TYPE_P0L0 0x1000
1154 #define MB_TYPE_P1L0 0x2000
1155 #define MB_TYPE_P0L1 0x4000
1156 #define MB_TYPE_P1L1 0x8000
1157 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1158 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1159 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1160 #define MB_TYPE_QUANT 0x00010000
1161 #define MB_TYPE_CBP 0x00020000
1162 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1167 * This specifies the area which should be displayed.
1168 * Note there may be multiple such areas for one frame.
1170 typedef struct AVPanScan{
1173 * - encoding: Set by user.
1174 * - decoding: Set by libavcodec.
1179 * width and height in 1/16 pel
1180 * - encoding: Set by user.
1181 * - decoding: Set by libavcodec.
1187 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1188 * - encoding: Set by user.
1189 * - decoding: Set by libavcodec.
1191 int16_t position[3][2];
1194 #if FF_API_QSCALE_TYPE
1195 #define FF_QSCALE_TYPE_MPEG1 0
1196 #define FF_QSCALE_TYPE_MPEG2 1
1197 #define FF_QSCALE_TYPE_H264 2
1198 #define FF_QSCALE_TYPE_VP56 3
1201 #if FF_API_GET_BUFFER
1202 #define FF_BUFFER_TYPE_INTERNAL 1
1203 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1204 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1205 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1207 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1208 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1209 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1210 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1214 * The decoder will keep a reference to the frame and may reuse it later.
1216 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1219 * @defgroup lavc_packet AVPacket
1221 * Types and functions for working with AVPacket.
1224 enum AVPacketSideDataType {
1225 AV_PKT_DATA_PALETTE,
1226 AV_PKT_DATA_NEW_EXTRADATA,
1229 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1232 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1233 * s32le channel_count
1234 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1235 * u64le channel_layout
1236 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1238 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1243 AV_PKT_DATA_PARAM_CHANGE,
1246 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1247 * structures with info about macroblocks relevant to splitting the
1248 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1249 * That is, it does not necessarily contain info about all macroblocks,
1250 * as long as the distance between macroblocks in the info is smaller
1251 * than the target payload size.
1252 * Each MB info structure is 12 bytes, and is laid out as follows:
1254 * u32le bit offset from the start of the packet
1255 * u8 current quantizer at the start of the macroblock
1257 * u16le macroblock address within the GOB
1258 * u8 horizontal MV predictor
1259 * u8 vertical MV predictor
1260 * u8 horizontal MV predictor for block number 3
1261 * u8 vertical MV predictor for block number 3
1264 AV_PKT_DATA_H263_MB_INFO,
1267 * This side data should be associated with an audio stream and contains
1268 * ReplayGain information in form of the AVReplayGain struct.
1270 AV_PKT_DATA_REPLAYGAIN,
1273 * This side data contains a 3x3 transformation matrix describing an affine
1274 * transformation that needs to be applied to the decoded video frames for
1275 * correct presentation.
1277 * See libavutil/display.h for a detailed description of the data.
1279 AV_PKT_DATA_DISPLAYMATRIX,
1282 * This side data should be associated with a video stream and contains
1283 * Stereoscopic 3D information in form of the AVStereo3D struct.
1285 AV_PKT_DATA_STEREO3D,
1288 * This side data should be associated with an audio stream and corresponds
1289 * to enum AVAudioServiceType.
1291 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1294 * This side data contains quality related information from the encoder.
1296 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1300 * u64le[error count] sum of squared differences between encoder in and output
1303 AV_PKT_DATA_QUALITY_STATS,
1306 * Recommmends skipping the specified number of samples
1308 * u32le number of samples to skip from start of this packet
1309 * u32le number of samples to skip from end of this packet
1310 * u8 reason for start skip
1311 * u8 reason for end skip (0=padding silence, 1=convergence)
1314 AV_PKT_DATA_SKIP_SAMPLES=70,
1317 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1318 * the packet may contain "dual mono" audio specific to Japanese DTV
1319 * and if it is true, recommends only the selected channel to be used.
1321 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1324 AV_PKT_DATA_JP_DUALMONO,
1327 * A list of zero terminated key/value strings. There is no end marker for
1328 * the list, so it is required to rely on the side data size to stop.
1330 AV_PKT_DATA_STRINGS_METADATA,
1333 * Subtitle event position
1341 AV_PKT_DATA_SUBTITLE_POSITION,
1344 * Data found in BlockAdditional element of matroska container. There is
1345 * no end marker for the data, so it is required to rely on the side data
1346 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1349 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1352 * The optional first identifier line of a WebVTT cue.
1354 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1357 * The optional settings (rendering instructions) that immediately
1358 * follow the timestamp specifier of a WebVTT cue.
1360 AV_PKT_DATA_WEBVTT_SETTINGS,
1363 * A list of zero terminated key/value strings. There is no end marker for
1364 * the list, so it is required to rely on the side data size to stop. This
1365 * side data includes updated metadata which appeared in the stream.
1367 AV_PKT_DATA_METADATA_UPDATE,
1370 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1372 typedef struct AVPacketSideData {
1375 enum AVPacketSideDataType type;
1379 * This structure stores compressed data. It is typically exported by demuxers
1380 * and then passed as input to decoders, or received as output from encoders and
1381 * then passed to muxers.
1383 * For video, it should typically contain one compressed frame. For audio it may
1384 * contain several compressed frames.
1386 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1387 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1388 * without libavcodec and libavformat major bump.
1390 * The semantics of data ownership depends on the buf or destruct (deprecated)
1391 * fields. If either is set, the packet data is dynamically allocated and is
1392 * valid indefinitely until av_free_packet() is called (which in turn calls
1393 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1394 * the packet data is typically backed by some static buffer somewhere and is
1395 * only valid for a limited time (e.g. until the next read call when demuxing).
1397 * The side data is always allocated with av_malloc() and is freed in
1400 typedef struct AVPacket {
1402 * A reference to the reference-counted buffer where the packet data is
1404 * May be NULL, then the packet data is not reference-counted.
1408 * Presentation timestamp in AVStream->time_base units; the time at which
1409 * the decompressed packet will be presented to the user.
1410 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1411 * pts MUST be larger or equal to dts as presentation cannot happen before
1412 * decompression, unless one wants to view hex dumps. Some formats misuse
1413 * the terms dts and pts/cts to mean something different. Such timestamps
1414 * must be converted to true pts/dts before they are stored in AVPacket.
1418 * Decompression timestamp in AVStream->time_base units; the time at which
1419 * the packet is decompressed.
1420 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1427 * A combination of AV_PKT_FLAG values
1431 * Additional packet data that can be provided by the container.
1432 * Packet can contain several types of side information.
1434 AVPacketSideData *side_data;
1435 int side_data_elems;
1438 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1439 * Equals next_pts - this_pts in presentation order.
1442 #if FF_API_DESTRUCT_PACKET
1443 attribute_deprecated
1444 void (*destruct)(struct AVPacket *);
1445 attribute_deprecated
1448 int64_t pos; ///< byte position in stream, -1 if unknown
1451 * Time difference in AVStream->time_base units from the pts of this
1452 * packet to the point at which the output from the decoder has converged
1453 * independent from the availability of previous frames. That is, the
1454 * frames are virtually identical no matter if decoding started from
1455 * the very first frame or from this keyframe.
1456 * Is AV_NOPTS_VALUE if unknown.
1457 * This field is not the display duration of the current packet.
1458 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1461 * The purpose of this field is to allow seeking in streams that have no
1462 * keyframes in the conventional sense. It corresponds to the
1463 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1464 * essential for some types of subtitle streams to ensure that all
1465 * subtitles are correctly displayed after seeking.
1467 int64_t convergence_duration;
1469 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1470 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1472 enum AVSideDataParamChangeFlags {
1473 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1474 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1475 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1476 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1482 struct AVCodecInternal;
1486 AV_FIELD_PROGRESSIVE,
1487 AV_FIELD_TT, //< Top coded_first, top displayed first
1488 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1489 AV_FIELD_TB, //< Top coded first, bottom displayed first
1490 AV_FIELD_BT, //< Bottom coded first, top displayed first
1494 * main external API structure.
1495 * New fields can be added to the end with minor version bumps.
1496 * Removal, reordering and changes to existing fields require a major
1498 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1500 * sizeof(AVCodecContext) must not be used outside libav*.
1502 typedef struct AVCodecContext {
1504 * information on struct for av_log
1505 * - set by avcodec_alloc_context3
1507 const AVClass *av_class;
1508 int log_level_offset;
1510 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1511 const struct AVCodec *codec;
1512 #if FF_API_CODEC_NAME
1514 * @deprecated this field is not used for anything in libavcodec
1516 attribute_deprecated
1517 char codec_name[32];
1519 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1522 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1523 * This is used to work around some encoder bugs.
1524 * A demuxer should set this to what is stored in the field used to identify the codec.
1525 * If there are multiple such fields in a container then the demuxer should choose the one
1526 * which maximizes the information about the used codec.
1527 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1528 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1529 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1531 * - encoding: Set by user, if not then the default based on codec_id will be used.
1532 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1534 unsigned int codec_tag;
1536 #if FF_API_STREAM_CODEC_TAG
1538 * @deprecated this field is unused
1540 attribute_deprecated
1541 unsigned int stream_codec_tag;
1547 * Private context used for internal data.
1549 * Unlike priv_data, this is not codec-specific. It is used in general
1550 * libavcodec functions.
1552 struct AVCodecInternal *internal;
1555 * Private data of the user, can be used to carry app specific stuff.
1556 * - encoding: Set by user.
1557 * - decoding: Set by user.
1562 * the average bitrate
1563 * - encoding: Set by user; unused for constant quantizer encoding.
1564 * - decoding: Set by user, may be overwritten by libavcodec
1565 * if this info is available in the stream
1570 * number of bits the bitstream is allowed to diverge from the reference.
1571 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1572 * - encoding: Set by user; unused for constant quantizer encoding.
1573 * - decoding: unused
1575 int bit_rate_tolerance;
1578 * Global quality for codecs which cannot change it per frame.
1579 * This should be proportional to MPEG-1/2/4 qscale.
1580 * - encoding: Set by user.
1581 * - decoding: unused
1586 * - encoding: Set by user.
1587 * - decoding: unused
1589 int compression_level;
1590 #define FF_COMPRESSION_DEFAULT -1
1594 * - encoding: Set by user.
1595 * - decoding: Set by user.
1601 * - encoding: Set by user.
1602 * - decoding: Set by user.
1607 * some codecs need / can use extradata like Huffman tables.
1608 * mjpeg: Huffman tables
1609 * rv10: additional flags
1610 * mpeg4: global headers (they can be in the bitstream or here)
1611 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1612 * than extradata_size to avoid problems if it is read with the bitstream reader.
1613 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1614 * - encoding: Set/allocated/freed by libavcodec.
1615 * - decoding: Set/allocated/freed by user.
1621 * This is the fundamental unit of time (in seconds) in terms
1622 * of which frame timestamps are represented. For fixed-fps content,
1623 * timebase should be 1/framerate and timestamp increments should be
1625 * This often, but not always is the inverse of the frame rate or field rate
1627 * - encoding: MUST be set by user.
1628 * - decoding: the use of this field for decoding is deprecated.
1629 * Use framerate instead.
1631 AVRational time_base;
1634 * For some codecs, the time base is closer to the field rate than the frame rate.
1635 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1636 * if no telecine is used ...
1638 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1640 int ticks_per_frame;
1645 * Encoding: Number of frames delay there will be from the encoder input to
1646 * the decoder output. (we assume the decoder matches the spec)
1647 * Decoding: Number of frames delay in addition to what a standard decoder
1648 * as specified in the spec would produce.
1651 * Number of frames the decoded output will be delayed relative to the
1655 * For encoding, this field is unused (see initial_padding).
1657 * For decoding, this is the number of samples the decoder needs to
1658 * output before the decoder's output is valid. When seeking, you should
1659 * start decoding this many samples prior to your desired seek point.
1661 * - encoding: Set by libavcodec.
1662 * - decoding: Set by libavcodec.
1669 * picture width / height.
1671 * @note Those fields may not match the values of the last
1672 * AVFrame outputted by avcodec_decode_video2 due frame
1675 * - encoding: MUST be set by user.
1676 * - decoding: May be set by the user before opening the decoder if known e.g.
1677 * from the container. Some decoders will require the dimensions
1678 * to be set by the caller. During decoding, the decoder may
1679 * overwrite those values as required while parsing the data.
1684 * Bitstream width / height, may be different from width/height e.g. when
1685 * the decoded frame is cropped before being output or lowres is enabled.
1687 * @note Those field may not match the value of the last
1688 * AVFrame outputted by avcodec_decode_video2 due frame
1691 * - encoding: unused
1692 * - decoding: May be set by the user before opening the decoder if known
1693 * e.g. from the container. During decoding, the decoder may
1694 * overwrite those values as required while parsing the data.
1696 int coded_width, coded_height;
1698 #if FF_API_ASPECT_EXTENDED
1699 #define FF_ASPECT_EXTENDED 15
1703 * the number of pictures in a group of pictures, or 0 for intra_only
1704 * - encoding: Set by user.
1705 * - decoding: unused
1710 * Pixel format, see AV_PIX_FMT_xxx.
1711 * May be set by the demuxer if known from headers.
1712 * May be overridden by the decoder if it knows better.
1714 * @note This field may not match the value of the last
1715 * AVFrame outputted by avcodec_decode_video2 due frame
1718 * - encoding: Set by user.
1719 * - decoding: Set by user if known, overridden by libavcodec while
1722 enum AVPixelFormat pix_fmt;
1724 #if FF_API_MOTION_EST
1726 * This option does nothing
1727 * @deprecated use codec private options instead
1729 attribute_deprecated int me_method;
1733 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1734 * decoder to draw a horizontal band. It improves cache usage. Not
1735 * all codecs can do that. You must check the codec capabilities
1737 * When multithreading is used, it may be called from multiple threads
1738 * at the same time; threads might draw different parts of the same AVFrame,
1739 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1741 * The function is also used by hardware acceleration APIs.
1742 * It is called at least once during frame decoding to pass
1743 * the data needed for hardware render.
1744 * In that mode instead of pixel data, AVFrame points to
1745 * a structure specific to the acceleration API. The application
1746 * reads the structure and can change some fields to indicate progress
1748 * - encoding: unused
1749 * - decoding: Set by user.
1750 * @param height the height of the slice
1751 * @param y the y position of the slice
1752 * @param type 1->top field, 2->bottom field, 3->frame
1753 * @param offset offset into the AVFrame.data from which the slice should be read
1755 void (*draw_horiz_band)(struct AVCodecContext *s,
1756 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1757 int y, int type, int height);
1760 * callback to negotiate the pixelFormat
1761 * @param fmt is the list of formats which are supported by the codec,
1762 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1763 * The first is always the native one.
1764 * @note The callback may be called again immediately if initialization for
1765 * the selected (hardware-accelerated) pixel format failed.
1766 * @warning Behavior is undefined if the callback returns a value not
1767 * in the fmt list of formats.
1768 * @return the chosen format
1769 * - encoding: unused
1770 * - decoding: Set by user, if not set the native format will be chosen.
1772 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1775 * maximum number of B-frames between non-B-frames
1776 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1777 * - encoding: Set by user.
1778 * - decoding: unused
1783 * qscale factor between IP and B-frames
1784 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1785 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1786 * - encoding: Set by user.
1787 * - decoding: unused
1789 float b_quant_factor;
1791 #if FF_API_RC_STRATEGY
1792 /** @deprecated use codec private option instead */
1793 attribute_deprecated int rc_strategy;
1794 #define FF_RC_STRATEGY_XVID 1
1797 int b_frame_strategy;
1800 * qscale offset between IP and B-frames
1801 * - encoding: Set by user.
1802 * - decoding: unused
1804 float b_quant_offset;
1807 * Size of the frame reordering buffer in the decoder.
1808 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1809 * - encoding: Set by libavcodec.
1810 * - decoding: Set by libavcodec.
1815 * 0-> h263 quant 1-> mpeg quant
1816 * - encoding: Set by user.
1817 * - decoding: unused
1822 * qscale factor between P and I-frames
1823 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1824 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1825 * - encoding: Set by user.
1826 * - decoding: unused
1828 float i_quant_factor;
1831 * qscale offset between P and I-frames
1832 * - encoding: Set by user.
1833 * - decoding: unused
1835 float i_quant_offset;
1838 * luminance masking (0-> disabled)
1839 * - encoding: Set by user.
1840 * - decoding: unused
1845 * temporary complexity masking (0-> disabled)
1846 * - encoding: Set by user.
1847 * - decoding: unused
1849 float temporal_cplx_masking;
1852 * spatial complexity masking (0-> disabled)
1853 * - encoding: Set by user.
1854 * - decoding: unused
1856 float spatial_cplx_masking;
1859 * p block masking (0-> disabled)
1860 * - encoding: Set by user.
1861 * - decoding: unused
1866 * darkness masking (0-> disabled)
1867 * - encoding: Set by user.
1868 * - decoding: unused
1874 * - encoding: Set by libavcodec.
1875 * - decoding: Set by user (or 0).
1879 * prediction method (needed for huffyuv)
1880 * - encoding: Set by user.
1881 * - decoding: unused
1883 int prediction_method;
1884 #define FF_PRED_LEFT 0
1885 #define FF_PRED_PLANE 1
1886 #define FF_PRED_MEDIAN 2
1889 * slice offsets in the frame in bytes
1890 * - encoding: Set/allocated by libavcodec.
1891 * - decoding: Set/allocated by user (or NULL).
1896 * sample aspect ratio (0 if unknown)
1897 * That is the width of a pixel divided by the height of the pixel.
1898 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1899 * - encoding: Set by user.
1900 * - decoding: Set by libavcodec.
1902 AVRational sample_aspect_ratio;
1905 * motion estimation comparison function
1906 * - encoding: Set by user.
1907 * - decoding: unused
1911 * subpixel motion estimation comparison function
1912 * - encoding: Set by user.
1913 * - decoding: unused
1917 * macroblock comparison function (not supported yet)
1918 * - encoding: Set by user.
1919 * - decoding: unused
1923 * interlaced DCT comparison function
1924 * - encoding: Set by user.
1925 * - decoding: unused
1928 #define FF_CMP_SAD 0
1929 #define FF_CMP_SSE 1
1930 #define FF_CMP_SATD 2
1931 #define FF_CMP_DCT 3
1932 #define FF_CMP_PSNR 4
1933 #define FF_CMP_BIT 5
1935 #define FF_CMP_ZERO 7
1936 #define FF_CMP_VSAD 8
1937 #define FF_CMP_VSSE 9
1938 #define FF_CMP_NSSE 10
1939 #define FF_CMP_W53 11
1940 #define FF_CMP_W97 12
1941 #define FF_CMP_DCTMAX 13
1942 #define FF_CMP_DCT264 14
1943 #define FF_CMP_CHROMA 256
1946 * ME diamond size & shape
1947 * - encoding: Set by user.
1948 * - decoding: unused
1953 * amount of previous MV predictors (2a+1 x 2a+1 square)
1954 * - encoding: Set by user.
1955 * - decoding: unused
1957 int last_predictor_count;
1960 * prepass for motion estimation
1961 * - encoding: Set by user.
1962 * - decoding: unused
1967 * motion estimation prepass comparison function
1968 * - encoding: Set by user.
1969 * - decoding: unused
1974 * ME prepass diamond size & shape
1975 * - encoding: Set by user.
1976 * - decoding: unused
1982 * - encoding: Set by user.
1983 * - decoding: unused
1985 int me_subpel_quality;
1989 * DTG active format information (additional aspect ratio
1990 * information only used in DVB MPEG-2 transport streams)
1993 * - encoding: unused
1994 * - decoding: Set by decoder.
1995 * @deprecated Deprecated in favor of AVSideData
1997 attribute_deprecated int dtg_active_format;
1998 #define FF_DTG_AFD_SAME 8
1999 #define FF_DTG_AFD_4_3 9
2000 #define FF_DTG_AFD_16_9 10
2001 #define FF_DTG_AFD_14_9 11
2002 #define FF_DTG_AFD_4_3_SP_14_9 13
2003 #define FF_DTG_AFD_16_9_SP_14_9 14
2004 #define FF_DTG_AFD_SP_4_3 15
2005 #endif /* FF_API_AFD */
2008 * maximum motion estimation search range in subpel units
2009 * If 0 then no limit.
2011 * - encoding: Set by user.
2012 * - decoding: unused
2016 #if FF_API_QUANT_BIAS
2018 * @deprecated use encoder private option instead
2020 attribute_deprecated int intra_quant_bias;
2021 #define FF_DEFAULT_QUANT_BIAS 999999
2024 * @deprecated use encoder private option instead
2026 attribute_deprecated int inter_quant_bias;
2031 * - encoding: unused
2032 * - decoding: Set by user.
2035 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2036 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2037 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2041 * XVideo Motion Acceleration
2042 * - encoding: forbidden
2043 * - decoding: set by decoder
2044 * @deprecated XvMC doesn't need it anymore.
2046 attribute_deprecated int xvmc_acceleration;
2047 #endif /* FF_API_XVMC */
2050 * macroblock decision mode
2051 * - encoding: Set by user.
2052 * - decoding: unused
2055 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2056 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2057 #define FF_MB_DECISION_RD 2 ///< rate distortion
2060 * custom intra quantization matrix
2061 * - encoding: Set by user, can be NULL.
2062 * - decoding: Set by libavcodec.
2064 uint16_t *intra_matrix;
2067 * custom inter quantization matrix
2068 * - encoding: Set by user, can be NULL.
2069 * - decoding: Set by libavcodec.
2071 uint16_t *inter_matrix;
2074 * scene change detection threshold
2075 * 0 is default, larger means fewer detected scene changes.
2076 * - encoding: Set by user.
2077 * - decoding: unused
2079 int scenechange_threshold;
2082 * noise reduction strength
2083 * - encoding: Set by user.
2084 * - decoding: unused
2086 int noise_reduction;
2090 * @deprecated this field is unused
2092 attribute_deprecated
2096 * @deprecated this field is unused
2098 attribute_deprecated
2103 * precision of the intra DC coefficient - 8
2104 * - encoding: Set by user.
2105 * - decoding: Set by libavcodec
2107 int intra_dc_precision;
2110 * Number of macroblock rows at the top which are skipped.
2111 * - encoding: unused
2112 * - decoding: Set by user.
2117 * Number of macroblock rows at the bottom which are skipped.
2118 * - encoding: unused
2119 * - decoding: Set by user.
2125 * @deprecated use encoder private options instead
2127 attribute_deprecated
2128 float border_masking;
2132 * minimum MB lagrange multipler
2133 * - encoding: Set by user.
2134 * - decoding: unused
2139 * maximum MB lagrange multipler
2140 * - encoding: Set by user.
2141 * - decoding: unused
2147 * - encoding: Set by user.
2148 * - decoding: unused
2150 int me_penalty_compensation;
2154 * - encoding: Set by user.
2155 * - decoding: unused
2161 * - encoding: Set by user.
2162 * - decoding: unused
2168 * - encoding: Set by user.
2169 * - decoding: unused
2174 * number of reference frames
2175 * - encoding: Set by user.
2176 * - decoding: Set by lavc.
2181 * chroma qp offset from luma
2182 * - encoding: Set by user.
2183 * - decoding: unused
2187 #if FF_API_UNUSED_MEMBERS
2189 * Multiplied by qscale for each frame and added to scene_change_score.
2190 * - encoding: Set by user.
2191 * - decoding: unused
2193 attribute_deprecated int scenechange_factor;
2198 * Note: Value depends upon the compare function used for fullpel ME.
2199 * - encoding: Set by user.
2200 * - decoding: unused
2205 * Adjust sensitivity of b_frame_strategy 1.
2206 * - encoding: Set by user.
2207 * - decoding: unused
2212 * Chromaticity coordinates of the source primaries.
2213 * - encoding: Set by user
2214 * - decoding: Set by libavcodec
2216 enum AVColorPrimaries color_primaries;
2219 * Color Transfer Characteristic.
2220 * - encoding: Set by user
2221 * - decoding: Set by libavcodec
2223 enum AVColorTransferCharacteristic color_trc;
2226 * YUV colorspace type.
2227 * - encoding: Set by user
2228 * - decoding: Set by libavcodec
2230 enum AVColorSpace colorspace;
2233 * MPEG vs JPEG YUV range.
2234 * - encoding: Set by user
2235 * - decoding: Set by libavcodec
2237 enum AVColorRange color_range;
2240 * This defines the location of chroma samples.
2241 * - encoding: Set by user
2242 * - decoding: Set by libavcodec
2244 enum AVChromaLocation chroma_sample_location;
2248 * Indicates number of picture subdivisions. Used for parallelized
2250 * - encoding: Set by user
2251 * - decoding: unused
2256 * - encoding: set by libavcodec
2257 * - decoding: Set by user.
2259 enum AVFieldOrder field_order;
2262 int sample_rate; ///< samples per second
2263 int channels; ///< number of audio channels
2266 * audio sample format
2267 * - encoding: Set by user.
2268 * - decoding: Set by libavcodec.
2270 enum AVSampleFormat sample_fmt; ///< sample format
2272 /* The following data should not be initialized. */
2274 * Number of samples per channel in an audio frame.
2276 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2277 * except the last must contain exactly frame_size samples per channel.
2278 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2279 * frame size is not restricted.
2280 * - decoding: may be set by some decoders to indicate constant frame size
2285 * Frame counter, set by libavcodec.
2287 * - decoding: total number of frames returned from the decoder so far.
2288 * - encoding: total number of frames passed to the encoder so far.
2290 * @note the counter is not incremented if encoding/decoding resulted in
2296 * number of bytes per packet if constant and known or 0
2297 * Used by some WAV based audio codecs.
2302 * Audio cutoff bandwidth (0 means "automatic")
2303 * - encoding: Set by user.
2304 * - decoding: unused
2309 * Audio channel layout.
2310 * - encoding: set by user.
2311 * - decoding: set by user, may be overwritten by libavcodec.
2313 uint64_t channel_layout;
2316 * Request decoder to use this channel layout if it can (0 for default)
2317 * - encoding: unused
2318 * - decoding: Set by user.
2320 uint64_t request_channel_layout;
2323 * Type of service that the audio stream conveys.
2324 * - encoding: Set by user.
2325 * - decoding: Set by libavcodec.
2327 enum AVAudioServiceType audio_service_type;
2330 * desired sample format
2331 * - encoding: Not used.
2332 * - decoding: Set by user.
2333 * Decoder will decode to this format if it can.
2335 enum AVSampleFormat request_sample_fmt;
2337 #if FF_API_GET_BUFFER
2339 * Called at the beginning of each frame to get a buffer for it.
2341 * The function will set AVFrame.data[], AVFrame.linesize[].
2342 * AVFrame.extended_data[] must also be set, but it should be the same as
2343 * AVFrame.data[] except for planar audio with more channels than can fit
2344 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2345 * many data pointers as it can hold.
2347 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2348 * avcodec_default_get_buffer() instead of providing buffers allocated by
2351 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2352 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2353 * but if get_buffer() is overridden then alignment considerations should
2354 * be taken into account.
2356 * @see avcodec_default_get_buffer()
2360 * If pic.reference is set then the frame will be read later by libavcodec.
2361 * avcodec_align_dimensions2() should be used to find the required width and
2362 * height, as they normally need to be rounded up to the next multiple of 16.
2364 * If frame multithreading is used and thread_safe_callbacks is set,
2365 * it may be called from a different thread, but not from more than one at
2366 * once. Does not need to be reentrant.
2368 * @see release_buffer(), reget_buffer()
2369 * @see avcodec_align_dimensions2()
2373 * Decoders request a buffer of a particular size by setting
2374 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2375 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2376 * to a smaller value in the output frame.
2378 * Decoders cannot use the buffer after returning from
2379 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2380 * is assumed to be released immediately upon return. In some rare cases,
2381 * a decoder may need to call get_buffer() more than once in a single
2382 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2383 * called again after it has already been called once, the previously
2384 * acquired buffer is assumed to be released at that time and may not be
2385 * reused by the decoder.
2387 * As a convenience, av_samples_get_buffer_size() and
2388 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2389 * functions to find the required data size and to fill data pointers and
2390 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2391 * since all planes must be the same size.
2393 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2395 * - encoding: unused
2396 * - decoding: Set by libavcodec, user can override.
2398 * @deprecated use get_buffer2()
2400 attribute_deprecated
2401 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2404 * Called to release buffers which were allocated with get_buffer.
2405 * A released buffer can be reused in get_buffer().
2406 * pic.data[*] must be set to NULL.
2407 * May be called from a different thread if frame multithreading is used,
2408 * but not by more than one thread at once, so does not need to be reentrant.
2409 * - encoding: unused
2410 * - decoding: Set by libavcodec, user can override.
2412 * @deprecated custom freeing callbacks should be set from get_buffer2()
2414 attribute_deprecated
2415 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2418 * Called at the beginning of a frame to get cr buffer for it.
2419 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2420 * libavcodec will pass previous buffer in pic, function should return
2421 * same buffer or new buffer with old frame "painted" into it.
2422 * If pic.data[0] == NULL must behave like get_buffer().
2423 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2424 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2426 * - encoding: unused
2427 * - decoding: Set by libavcodec, user can override.
2429 attribute_deprecated
2430 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2434 * This callback is called at the beginning of each frame to get data
2435 * buffer(s) for it. There may be one contiguous buffer for all the data or
2436 * there may be a buffer per each data plane or anything in between. What
2437 * this means is, you may set however many entries in buf[] you feel necessary.
2438 * Each buffer must be reference-counted using the AVBuffer API (see description
2441 * The following fields will be set in the frame before this callback is
2444 * - width, height (video only)
2445 * - sample_rate, channel_layout, nb_samples (audio only)
2446 * Their values may differ from the corresponding values in
2447 * AVCodecContext. This callback must use the frame values, not the codec
2448 * context values, to calculate the required buffer size.
2450 * This callback must fill the following fields in the frame:
2454 * * if the data is planar audio with more than 8 channels, then this
2455 * callback must allocate and fill extended_data to contain all pointers
2456 * to all data planes. data[] must hold as many pointers as it can.
2457 * extended_data must be allocated with av_malloc() and will be freed in
2459 * * otherwise exended_data must point to data
2460 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2461 * the frame's data and extended_data pointers must be contained in these. That
2462 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2463 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2464 * and av_buffer_ref().
2465 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2466 * this callback and filled with the extra buffers if there are more
2467 * buffers than buf[] can hold. extended_buf will be freed in
2470 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2471 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2474 * Each data plane must be aligned to the maximum required by the target
2477 * @see avcodec_default_get_buffer2()
2481 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2482 * (read and/or written to if it is writable) later by libavcodec.
2484 * avcodec_align_dimensions2() should be used to find the required width and
2485 * height, as they normally need to be rounded up to the next multiple of 16.
2487 * Some decoders do not support linesizes changing between frames.
2489 * If frame multithreading is used and thread_safe_callbacks is set,
2490 * this callback may be called from a different thread, but not from more
2491 * than one at once. Does not need to be reentrant.
2493 * @see avcodec_align_dimensions2()
2497 * Decoders request a buffer of a particular size by setting
2498 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2499 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2500 * to a smaller value in the output frame.
2502 * As a convenience, av_samples_get_buffer_size() and
2503 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2504 * functions to find the required data size and to fill data pointers and
2505 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2506 * since all planes must be the same size.
2508 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2510 * - encoding: unused
2511 * - decoding: Set by libavcodec, user can override.
2513 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2516 * If non-zero, the decoded audio and video frames returned from
2517 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2518 * and are valid indefinitely. The caller must free them with
2519 * av_frame_unref() when they are not needed anymore.
2520 * Otherwise, the decoded frames must not be freed by the caller and are
2521 * only valid until the next decode call.
2523 * - encoding: unused
2524 * - decoding: set by the caller before avcodec_open2().
2526 int refcounted_frames;
2528 /* - encoding parameters */
2529 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2530 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2534 * - encoding: Set by user.
2535 * - decoding: unused
2541 * - encoding: Set by user.
2542 * - decoding: unused
2547 * maximum quantizer difference between frames
2548 * - encoding: Set by user.
2549 * - decoding: unused
2555 * @deprecated use encoder private options instead
2557 attribute_deprecated
2560 attribute_deprecated
2562 attribute_deprecated
2567 * decoder bitstream buffer size
2568 * - encoding: Set by user.
2569 * - decoding: unused
2574 * ratecontrol override, see RcOverride
2575 * - encoding: Allocated/set/freed by user.
2576 * - decoding: unused
2578 int rc_override_count;
2579 RcOverride *rc_override;
2583 * @deprecated use encoder private options instead
2585 attribute_deprecated
2591 * - encoding: Set by user.
2592 * - decoding: Set by user, may be overwritten by libavcodec.
2598 * - encoding: Set by user.
2599 * - decoding: unused
2605 * @deprecated use encoder private options instead
2607 attribute_deprecated
2608 float rc_buffer_aggressivity;
2610 attribute_deprecated
2611 float rc_initial_cplx;
2615 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2616 * - encoding: Set by user.
2617 * - decoding: unused.
2619 float rc_max_available_vbv_use;
2622 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2623 * - encoding: Set by user.
2624 * - decoding: unused.
2626 float rc_min_vbv_overflow_use;
2629 * Number of bits which should be loaded into the rc buffer before decoding starts.
2630 * - encoding: Set by user.
2631 * - decoding: unused
2633 int rc_initial_buffer_occupancy;
2635 #define FF_CODER_TYPE_VLC 0
2636 #define FF_CODER_TYPE_AC 1
2637 #define FF_CODER_TYPE_RAW 2
2638 #define FF_CODER_TYPE_RLE 3
2639 #if FF_API_UNUSED_MEMBERS
2640 #define FF_CODER_TYPE_DEFLATE 4
2641 #endif /* FF_API_UNUSED_MEMBERS */
2644 * - encoding: Set by user.
2645 * - decoding: unused
2651 * - encoding: Set by user.
2652 * - decoding: unused
2658 * @deprecated use encoder private options instead
2660 attribute_deprecated
2664 * @deprecated use encoder private options instead
2666 attribute_deprecated
2671 * frame skip threshold
2672 * - encoding: Set by user.
2673 * - decoding: unused
2675 int frame_skip_threshold;
2679 * - encoding: Set by user.
2680 * - decoding: unused
2682 int frame_skip_factor;
2685 * frame skip exponent
2686 * - encoding: Set by user.
2687 * - decoding: unused
2692 * frame skip comparison function
2693 * - encoding: Set by user.
2694 * - decoding: unused
2699 * trellis RD quantization
2700 * - encoding: Set by user.
2701 * - decoding: unused
2706 * - encoding: Set by user.
2707 * - decoding: unused
2709 int min_prediction_order;
2712 * - encoding: Set by user.
2713 * - decoding: unused
2715 int max_prediction_order;
2718 * GOP timecode frame start number
2719 * - encoding: Set by user, in non drop frame format
2720 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2722 int64_t timecode_frame_start;
2724 /* The RTP callback: This function is called */
2725 /* every time the encoder has a packet to send. */
2726 /* It depends on the encoder if the data starts */
2727 /* with a Start Code (it should). H.263 does. */
2728 /* mb_nb contains the number of macroblocks */
2729 /* encoded in the RTP payload. */
2730 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2732 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2733 /* do its best to deliver a chunk with size */
2734 /* below rtp_payload_size, the chunk will start */
2735 /* with a start code on some codecs like H.263. */
2736 /* This doesn't take account of any particular */
2737 /* headers inside the transmitted RTP payload. */
2739 /* statistics, used for 2-pass encoding */
2750 * number of bits used for the previously encoded frame
2751 * - encoding: Set by libavcodec.
2752 * - decoding: unused
2757 * pass1 encoding statistics output buffer
2758 * - encoding: Set by libavcodec.
2759 * - decoding: unused
2764 * pass2 encoding statistics input buffer
2765 * Concatenated stuff from stats_out of pass1 should be placed here.
2766 * - encoding: Allocated/set/freed by user.
2767 * - decoding: unused
2772 * Work around bugs in encoders which sometimes cannot be detected automatically.
2773 * - encoding: Set by user
2774 * - decoding: Set by user
2776 int workaround_bugs;
2777 #define FF_BUG_AUTODETECT 1 ///< autodetection
2778 #if FF_API_OLD_MSMPEG4
2779 #define FF_BUG_OLD_MSMPEG4 2
2781 #define FF_BUG_XVID_ILACE 4
2782 #define FF_BUG_UMP4 8
2783 #define FF_BUG_NO_PADDING 16
2784 #define FF_BUG_AMV 32
2786 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2788 #define FF_BUG_QPEL_CHROMA 64
2789 #define FF_BUG_STD_QPEL 128
2790 #define FF_BUG_QPEL_CHROMA2 256
2791 #define FF_BUG_DIRECT_BLOCKSIZE 512
2792 #define FF_BUG_EDGE 1024
2793 #define FF_BUG_HPEL_CHROMA 2048
2794 #define FF_BUG_DC_CLIP 4096
2795 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2796 #define FF_BUG_TRUNCATED 16384
2799 * strictly follow the standard (MPEG4, ...).
2800 * - encoding: Set by user.
2801 * - decoding: Set by user.
2802 * Setting this to STRICT or higher means the encoder and decoder will
2803 * generally do stupid things, whereas setting it to unofficial or lower
2804 * will mean the encoder might produce output that is not supported by all
2805 * spec-compliant decoders. Decoders don't differentiate between normal,
2806 * unofficial and experimental (that is, they always try to decode things
2807 * when they can) unless they are explicitly asked to behave stupidly
2808 * (=strictly conform to the specs)
2810 int strict_std_compliance;
2811 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2812 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2813 #define FF_COMPLIANCE_NORMAL 0
2814 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2815 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2818 * error concealment flags
2819 * - encoding: unused
2820 * - decoding: Set by user.
2822 int error_concealment;
2823 #define FF_EC_GUESS_MVS 1
2824 #define FF_EC_DEBLOCK 2
2825 #define FF_EC_FAVOR_INTER 256
2829 * - encoding: Set by user.
2830 * - decoding: Set by user.
2833 #define FF_DEBUG_PICT_INFO 1
2834 #define FF_DEBUG_RC 2
2835 #define FF_DEBUG_BITSTREAM 4
2836 #define FF_DEBUG_MB_TYPE 8
2837 #define FF_DEBUG_QP 16
2840 * @deprecated this option does nothing
2842 #define FF_DEBUG_MV 32
2844 #define FF_DEBUG_DCT_COEFF 0x00000040
2845 #define FF_DEBUG_SKIP 0x00000080
2846 #define FF_DEBUG_STARTCODE 0x00000100
2847 #if FF_API_UNUSED_MEMBERS
2848 #define FF_DEBUG_PTS 0x00000200
2849 #endif /* FF_API_UNUSED_MEMBERS */
2850 #define FF_DEBUG_ER 0x00000400
2851 #define FF_DEBUG_MMCO 0x00000800
2852 #define FF_DEBUG_BUGS 0x00001000
2854 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2855 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2857 #define FF_DEBUG_BUFFERS 0x00008000
2858 #define FF_DEBUG_THREADS 0x00010000
2859 #define FF_DEBUG_GREEN_MD 0x00800000
2860 #define FF_DEBUG_NOMC 0x01000000
2865 * Code outside libavcodec should access this field using AVOptions
2866 * - encoding: Set by user.
2867 * - decoding: Set by user.
2870 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2871 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2872 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2876 * Error recognition; may misdetect some more or less valid parts as errors.
2877 * - encoding: unused
2878 * - decoding: Set by user.
2880 int err_recognition;
2883 * Verify checksums embedded in the bitstream (could be of either encoded or
2884 * decoded data, depending on the codec) and print an error message on mismatch.
2885 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2886 * decoder returning an error.
2888 #define AV_EF_CRCCHECK (1<<0)
2889 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2890 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2891 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2893 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2894 #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
2895 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2896 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2900 * opaque 64bit number (generally a PTS) that will be reordered and
2901 * output in AVFrame.reordered_opaque
2902 * - encoding: unused
2903 * - decoding: Set by user.
2905 int64_t reordered_opaque;
2908 * Hardware accelerator in use
2909 * - encoding: unused.
2910 * - decoding: Set by libavcodec
2912 struct AVHWAccel *hwaccel;
2915 * Hardware accelerator context.
2916 * For some hardware accelerators, a global context needs to be
2917 * provided by the user. In that case, this holds display-dependent
2918 * data FFmpeg cannot instantiate itself. Please refer to the
2919 * FFmpeg HW accelerator documentation to know how to fill this
2920 * is. e.g. for VA API, this is a struct vaapi_context.
2921 * - encoding: unused
2922 * - decoding: Set by user
2924 void *hwaccel_context;
2928 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2929 * - decoding: unused
2931 uint64_t error[AV_NUM_DATA_POINTERS];
2934 * DCT algorithm, see FF_DCT_* below
2935 * - encoding: Set by user.
2936 * - decoding: unused
2939 #define FF_DCT_AUTO 0
2940 #define FF_DCT_FASTINT 1
2941 #define FF_DCT_INT 2
2942 #define FF_DCT_MMX 3
2943 #define FF_DCT_ALTIVEC 5
2944 #define FF_DCT_FAAN 6
2947 * IDCT algorithm, see FF_IDCT_* below.
2948 * - encoding: Set by user.
2949 * - decoding: Set by user.
2952 #define FF_IDCT_AUTO 0
2953 #define FF_IDCT_INT 1
2954 #define FF_IDCT_SIMPLE 2
2955 #define FF_IDCT_SIMPLEMMX 3
2956 #define FF_IDCT_ARM 7
2957 #define FF_IDCT_ALTIVEC 8
2959 #define FF_IDCT_SH4 9
2961 #define FF_IDCT_SIMPLEARM 10
2962 #if FF_API_UNUSED_MEMBERS
2963 #define FF_IDCT_IPP 13
2964 #endif /* FF_API_UNUSED_MEMBERS */
2965 #define FF_IDCT_XVID 14
2966 #if FF_API_IDCT_XVIDMMX
2967 #define FF_IDCT_XVIDMMX 14
2968 #endif /* FF_API_IDCT_XVIDMMX */
2969 #define FF_IDCT_SIMPLEARMV5TE 16
2970 #define FF_IDCT_SIMPLEARMV6 17
2971 #if FF_API_ARCH_SPARC
2972 #define FF_IDCT_SIMPLEVIS 18
2974 #define FF_IDCT_FAAN 20
2975 #define FF_IDCT_SIMPLENEON 22
2976 #if FF_API_ARCH_ALPHA
2977 #define FF_IDCT_SIMPLEALPHA 23
2979 #define FF_IDCT_SIMPLEAUTO 128
2982 * bits per sample/pixel from the demuxer (needed for huffyuv).
2983 * - encoding: Set by libavcodec.
2984 * - decoding: Set by user.
2986 int bits_per_coded_sample;
2989 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2990 * - encoding: set by user.
2991 * - decoding: set by libavcodec.
2993 int bits_per_raw_sample;
2997 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2998 * - encoding: unused
2999 * - decoding: Set by user.
3000 * Code outside libavcodec should access this field using:
3001 * av_codec_{get,set}_lowres(avctx)
3006 #if FF_API_CODED_FRAME
3008 * the picture in the bitstream
3009 * - encoding: Set by libavcodec.
3010 * - decoding: unused
3012 * @deprecated use the quality factor packet side data instead
3014 attribute_deprecated AVFrame *coded_frame;
3019 * is used to decide how many independent tasks should be passed to execute()
3020 * - encoding: Set by user.
3021 * - decoding: Set by user.
3026 * Which multithreading methods to use.
3027 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3028 * so clients which cannot provide future frames should not use it.
3030 * - encoding: Set by user, otherwise the default is used.
3031 * - decoding: Set by user, otherwise the default is used.
3034 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3035 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3038 * Which multithreading methods are in use by the codec.
3039 * - encoding: Set by libavcodec.
3040 * - decoding: Set by libavcodec.
3042 int active_thread_type;
3045 * Set by the client if its custom get_buffer() callback can be called
3046 * synchronously from another thread, which allows faster multithreaded decoding.
3047 * draw_horiz_band() will be called from other threads regardless of this setting.
3048 * Ignored if the default get_buffer() is used.
3049 * - encoding: Set by user.
3050 * - decoding: Set by user.
3052 int thread_safe_callbacks;
3055 * The codec may call this to execute several independent things.
3056 * It will return only after finishing all tasks.
3057 * The user may replace this with some multithreaded implementation,
3058 * the default implementation will execute the parts serially.
3059 * @param count the number of things to execute
3060 * - encoding: Set by libavcodec, user can override.
3061 * - decoding: Set by libavcodec, user can override.
3063 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3066 * The codec may call this to execute several independent things.
3067 * It will return only after finishing all tasks.
3068 * The user may replace this with some multithreaded implementation,
3069 * the default implementation will execute the parts serially.
3070 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3071 * @param c context passed also to func
3072 * @param count the number of things to execute
3073 * @param arg2 argument passed unchanged to func
3074 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3075 * @param func function that will be called count times, with jobnr from 0 to count-1.
3076 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3077 * two instances of func executing at the same time will have the same threadnr.
3078 * @return always 0 currently, but code should handle a future improvement where when any call to func
3079 * returns < 0 no further calls to func may be done and < 0 is returned.
3080 * - encoding: Set by libavcodec, user can override.
3081 * - decoding: Set by libavcodec, user can override.
3083 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3085 #if FF_API_THREAD_OPAQUE
3087 * @deprecated this field should not be used from outside of lavc
3089 attribute_deprecated
3090 void *thread_opaque;
3094 * noise vs. sse weight for the nsse comparison function
3095 * - encoding: Set by user.
3096 * - decoding: unused
3102 * - encoding: Set by user.
3103 * - decoding: Set by libavcodec.
3106 #define FF_PROFILE_UNKNOWN -99
3107 #define FF_PROFILE_RESERVED -100
3109 #define FF_PROFILE_AAC_MAIN 0
3110 #define FF_PROFILE_AAC_LOW 1
3111 #define FF_PROFILE_AAC_SSR 2
3112 #define FF_PROFILE_AAC_LTP 3
3113 #define FF_PROFILE_AAC_HE 4
3114 #define FF_PROFILE_AAC_HE_V2 28
3115 #define FF_PROFILE_AAC_LD 22
3116 #define FF_PROFILE_AAC_ELD 38
3117 #define FF_PROFILE_MPEG2_AAC_LOW 128
3118 #define FF_PROFILE_MPEG2_AAC_HE 131
3120 #define FF_PROFILE_DTS 20
3121 #define FF_PROFILE_DTS_ES 30
3122 #define FF_PROFILE_DTS_96_24 40
3123 #define FF_PROFILE_DTS_HD_HRA 50
3124 #define FF_PROFILE_DTS_HD_MA 60
3125 #define FF_PROFILE_DTS_EXPRESS 70
3127 #define FF_PROFILE_MPEG2_422 0
3128 #define FF_PROFILE_MPEG2_HIGH 1
3129 #define FF_PROFILE_MPEG2_SS 2
3130 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3131 #define FF_PROFILE_MPEG2_MAIN 4
3132 #define FF_PROFILE_MPEG2_SIMPLE 5
3134 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3135 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3137 #define FF_PROFILE_H264_BASELINE 66
3138 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3139 #define FF_PROFILE_H264_MAIN 77
3140 #define FF_PROFILE_H264_EXTENDED 88
3141 #define FF_PROFILE_H264_HIGH 100
3142 #define FF_PROFILE_H264_HIGH_10 110
3143 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3144 #define FF_PROFILE_H264_HIGH_422 122
3145 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3146 #define FF_PROFILE_H264_HIGH_444 144
3147 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3148 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3149 #define FF_PROFILE_H264_CAVLC_444 44
3151 #define FF_PROFILE_VC1_SIMPLE 0
3152 #define FF_PROFILE_VC1_MAIN 1
3153 #define FF_PROFILE_VC1_COMPLEX 2
3154 #define FF_PROFILE_VC1_ADVANCED 3
3156 #define FF_PROFILE_MPEG4_SIMPLE 0
3157 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3158 #define FF_PROFILE_MPEG4_CORE 2
3159 #define FF_PROFILE_MPEG4_MAIN 3
3160 #define FF_PROFILE_MPEG4_N_BIT 4
3161 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3162 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3163 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3164 #define FF_PROFILE_MPEG4_HYBRID 8
3165 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3166 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3167 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3168 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3169 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3170 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3171 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3173 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3174 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3175 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3176 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3177 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3179 #define FF_PROFILE_VP9_0 0
3180 #define FF_PROFILE_VP9_1 1
3181 #define FF_PROFILE_VP9_2 2
3182 #define FF_PROFILE_VP9_3 3
3184 #define FF_PROFILE_HEVC_MAIN 1
3185 #define FF_PROFILE_HEVC_MAIN_10 2
3186 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3187 #define FF_PROFILE_HEVC_REXT 4
3191 * - encoding: Set by user.
3192 * - decoding: Set by libavcodec.
3195 #define FF_LEVEL_UNKNOWN -99
3198 * Skip loop filtering for selected frames.
3199 * - encoding: unused
3200 * - decoding: Set by user.
3202 enum AVDiscard skip_loop_filter;
3205 * Skip IDCT/dequantization for selected frames.
3206 * - encoding: unused
3207 * - decoding: Set by user.
3209 enum AVDiscard skip_idct;
3212 * Skip decoding for selected frames.
3213 * - encoding: unused
3214 * - decoding: Set by user.
3216 enum AVDiscard skip_frame;
3219 * Header containing style information for text subtitles.
3220 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3221 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3222 * the Format line following. It shouldn't include any Dialogue line.
3223 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3224 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3226 uint8_t *subtitle_header;
3227 int subtitle_header_size;
3229 #if FF_API_ERROR_RATE
3231 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3234 attribute_deprecated
3238 #if FF_API_CODEC_PKT
3240 * @deprecated this field is not supposed to be accessed from outside lavc
3242 attribute_deprecated
3247 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3248 * Used for compliant TS muxing.
3249 * - encoding: Set by libavcodec.
3250 * - decoding: unused.
3255 * Encoding only. Allow encoders to output packets that do not contain any
3256 * encoded data, only side data.
3258 * Some encoders need to output such packets, e.g. to update some stream
3259 * parameters at the end of encoding.
3261 * All callers are strongly recommended to set this option to 1 and update
3262 * their code to deal with such packets, since this behaviour may become
3263 * always enabled in the future (then this option will be deprecated and
3264 * later removed). To avoid ABI issues when this happens, the callers should
3265 * use AVOptions to set this field.
3267 int side_data_only_packets;
3270 * Audio only. The number of "priming" samples (padding) inserted by the
3271 * encoder at the beginning of the audio. I.e. this number of leading
3272 * decoded samples must be discarded by the caller to get the original audio
3273 * without leading padding.
3275 * - decoding: unused
3276 * - encoding: Set by libavcodec. The timestamps on the output packets are
3277 * adjusted by the encoder so that they always refer to the
3278 * first sample of the data actually contained in the packet,
3279 * including any added padding. E.g. if the timebase is
3280 * 1/samplerate and the timestamp of the first input sample is
3281 * 0, the timestamp of the first output packet will be
3284 int initial_padding;
3287 * - decoding: For codecs that store a framerate value in the compressed
3288 * bitstream, the decoder may export it here. { 0, 1} when
3290 * - encoding: unused
3292 AVRational framerate;
3295 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3296 * - encoding: unused.
3297 * - decoding: Set by libavcodec before calling get_format()
3299 enum AVPixelFormat sw_pix_fmt;
3302 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3303 * Code outside libavcodec should access this field using:
3304 * av_codec_{get,set}_pkt_timebase(avctx)
3305 * - encoding unused.
3306 * - decoding set by user.
3308 AVRational pkt_timebase;
3312 * Code outside libavcodec should access this field using:
3313 * av_codec_{get,set}_codec_descriptor(avctx)
3314 * - encoding: unused.
3315 * - decoding: set by libavcodec.
3317 const AVCodecDescriptor *codec_descriptor;
3321 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3322 * - encoding: unused
3323 * - decoding: Set by user.
3324 * Code outside libavcodec should access this field using:
3325 * av_codec_{get,set}_lowres(avctx)
3331 * Current statistics for PTS correction.
3332 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3333 * - encoding: unused
3335 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3336 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3337 int64_t pts_correction_last_pts; /// PTS of the last frame
3338 int64_t pts_correction_last_dts; /// DTS of the last frame
3341 * Character encoding of the input subtitles file.
3342 * - decoding: set by user
3343 * - encoding: unused
3348 * Subtitles character encoding mode. Formats or codecs might be adjusting
3349 * this setting (if they are doing the conversion themselves for instance).
3350 * - decoding: set by libavcodec
3351 * - encoding: unused
3353 int sub_charenc_mode;
3354 #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)
3355 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3356 #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
3359 * Skip processing alpha if supported by codec.
3360 * Note that if the format uses pre-multiplied alpha (common with VP6,
3361 * and recommended due to better video quality/compression)
3362 * the image will look as if alpha-blended onto a black background.
3363 * However for formats that do not use pre-multiplied alpha
3364 * there might be serious artefacts (though e.g. libswscale currently
3365 * assumes pre-multiplied alpha anyway).
3366 * Code outside libavcodec should access this field using AVOptions
3368 * - decoding: set by user
3369 * - encoding: unused
3374 * Number of samples to skip after a discontinuity
3375 * - decoding: unused
3376 * - encoding: set by libavcodec
3380 #if !FF_API_DEBUG_MV
3382 * debug motion vectors
3383 * Code outside libavcodec should access this field using AVOptions
3384 * - encoding: Set by user.
3385 * - decoding: Set by user.
3388 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3389 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3390 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3394 * custom intra quantization matrix
3395 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3396 * - encoding: Set by user, can be NULL.
3397 * - decoding: unused.
3399 uint16_t *chroma_intra_matrix;
3402 * dump format separator.
3403 * can be ", " or "\n " or anything else
3404 * Code outside libavcodec should access this field using AVOptions
3405 * (NO direct access).
3406 * - encoding: Set by user.
3407 * - decoding: Set by user.
3409 uint8_t *dump_separator;
3412 * ',' separated list of allowed decoders.
3413 * If NULL then all are allowed
3414 * - encoding: unused
3415 * - decoding: set by user through AVOPtions (NO direct access)
3417 char *codec_whitelist;
3420 * Properties of the stream that gets decoded
3421 * To be accessed through av_codec_get_properties() (NO direct access)
3422 * - encoding: unused
3423 * - decoding: set by libavcodec
3425 unsigned properties;
3426 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3427 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3430 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3431 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3433 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3434 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3436 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3438 int av_codec_get_lowres(const AVCodecContext *avctx);
3439 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3441 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3442 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3444 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3445 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3450 typedef struct AVProfile {
3452 const char *name; ///< short name for the profile
3455 typedef struct AVCodecDefault AVCodecDefault;
3462 typedef struct AVCodec {
3464 * Name of the codec implementation.
3465 * The name is globally unique among encoders and among decoders (but an
3466 * encoder and a decoder can share the same name).
3467 * This is the primary way to find a codec from the user perspective.
3471 * Descriptive name for the codec, meant to be more human readable than name.
3472 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3474 const char *long_name;
3475 enum AVMediaType type;
3478 * Codec capabilities.
3479 * see AV_CODEC_CAP_*
3482 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3483 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3484 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3485 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3486 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3487 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3488 const AVClass *priv_class; ///< AVClass for the private context
3489 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3491 /*****************************************************************
3492 * No fields below this line are part of the public API. They
3493 * may not be used outside of libavcodec and can be changed and
3495 * New public fields should be added right above.
3496 *****************************************************************
3499 struct AVCodec *next;
3501 * @name Frame-level threading support functions
3505 * If defined, called on thread contexts when they are created.
3506 * If the codec allocates writable tables in init(), re-allocate them here.
3507 * priv_data will be set to a copy of the original.
3509 int (*init_thread_copy)(AVCodecContext *);
3511 * Copy necessary context variables from a previous thread context to the current one.
3512 * If not defined, the next thread will start automatically; otherwise, the codec
3513 * must call ff_thread_finish_setup().
3515 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3517 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3521 * Private codec-specific defaults.
3523 const AVCodecDefault *defaults;
3526 * Initialize codec static data, called from avcodec_register().
3528 void (*init_static_data)(struct AVCodec *codec);
3530 int (*init)(AVCodecContext *);
3531 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3532 const struct AVSubtitle *sub);
3534 * Encode data to an AVPacket.
3536 * @param avctx codec context
3537 * @param avpkt output AVPacket (may contain a user-provided buffer)
3538 * @param[in] frame AVFrame containing the raw data to be encoded
3539 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3540 * non-empty packet was returned in avpkt.
3541 * @return 0 on success, negative error code on failure
3543 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3544 int *got_packet_ptr);
3545 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3546 int (*close)(AVCodecContext *);
3549 * Will be called when seeking
3551 void (*flush)(AVCodecContext *);
3553 * Internal codec capabilities.
3554 * See FF_CODEC_CAP_* in internal.h
3559 int av_codec_get_max_lowres(const AVCodec *codec);
3561 struct MpegEncContext;
3564 * @defgroup lavc_hwaccel AVHWAccel
3567 typedef struct AVHWAccel {
3569 * Name of the hardware accelerated codec.
3570 * The name is globally unique among encoders and among decoders (but an
3571 * encoder and a decoder can share the same name).
3576 * Type of codec implemented by the hardware accelerator.
3578 * See AVMEDIA_TYPE_xxx
3580 enum AVMediaType type;
3583 * Codec implemented by the hardware accelerator.
3585 * See AV_CODEC_ID_xxx
3590 * Supported pixel format.
3592 * Only hardware accelerated formats are supported here.
3594 enum AVPixelFormat pix_fmt;
3597 * Hardware accelerated codec capabilities.
3598 * see HWACCEL_CODEC_CAP_*
3602 /*****************************************************************
3603 * No fields below this line are part of the public API. They
3604 * may not be used outside of libavcodec and can be changed and
3606 * New public fields should be added right above.
3607 *****************************************************************
3609 struct AVHWAccel *next;
3612 * Allocate a custom buffer
3614 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3617 * Called at the beginning of each frame or field picture.
3619 * Meaningful frame information (codec specific) is guaranteed to
3620 * be parsed at this point. This function is mandatory.
3622 * Note that buf can be NULL along with buf_size set to 0.
3623 * Otherwise, this means the whole frame is available at this point.
3625 * @param avctx the codec context
3626 * @param buf the frame data buffer base
3627 * @param buf_size the size of the frame in bytes
3628 * @return zero if successful, a negative value otherwise
3630 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3633 * Callback for each slice.
3635 * Meaningful slice information (codec specific) is guaranteed to
3636 * be parsed at this point. This function is mandatory.
3637 * The only exception is XvMC, that works on MB level.
3639 * @param avctx the codec context
3640 * @param buf the slice data buffer base
3641 * @param buf_size the size of the slice in bytes
3642 * @return zero if successful, a negative value otherwise
3644 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3647 * Called at the end of each frame or field picture.
3649 * The whole picture is parsed at this point and can now be sent
3650 * to the hardware accelerator. This function is mandatory.
3652 * @param avctx the codec context
3653 * @return zero if successful, a negative value otherwise
3655 int (*end_frame)(AVCodecContext *avctx);
3658 * Size of per-frame hardware accelerator private data.
3660 * Private data is allocated with av_mallocz() before
3661 * AVCodecContext.get_buffer() and deallocated after
3662 * AVCodecContext.release_buffer().
3664 int frame_priv_data_size;
3667 * Called for every Macroblock in a slice.
3669 * XvMC uses it to replace the ff_mpv_decode_mb().
3670 * Instead of decoding to raw picture, MB parameters are
3671 * stored in an array provided by the video driver.
3673 * @param s the mpeg context
3675 void (*decode_mb)(struct MpegEncContext *s);
3678 * Initialize the hwaccel private data.
3680 * This will be called from ff_get_format(), after hwaccel and
3681 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3684 int (*init)(AVCodecContext *avctx);
3687 * Uninitialize the hwaccel private data.
3689 * This will be called from get_format() or avcodec_close(), after hwaccel
3690 * and hwaccel_context are already uninitialized.
3692 int (*uninit)(AVCodecContext *avctx);
3695 * Size of the private data to allocate in
3696 * AVCodecInternal.hwaccel_priv_data.
3702 * Hardware acceleration should be used for decoding even if the codec level
3703 * used is unknown or higher than the maximum supported level reported by the
3706 * It's generally a good idea to pass this flag unless you have a specific
3707 * reason not to, as hardware tends to under-report supported levels.
3709 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3712 * Hardware acceleration can output YUV pixel formats with a different chroma
3713 * sampling than 4:2:0 and/or other than 8 bits per component.
3715 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3722 * @defgroup lavc_picture AVPicture
3724 * Functions for working with AVPicture
3729 * Picture data structure.
3731 * Up to four components can be stored into it, the last component is
3734 typedef struct AVPicture {
3735 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3736 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3743 enum AVSubtitleType {
3746 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3749 * Plain text, the text field must be set by the decoder and is
3750 * authoritative. ass and pict fields may contain approximations.
3755 * Formatted text, the ass field must be set by the decoder and is
3756 * authoritative. pict and text fields may contain approximations.
3761 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3763 typedef struct AVSubtitleRect {
3764 int x; ///< top left corner of pict, undefined when pict is not set
3765 int y; ///< top left corner of pict, undefined when pict is not set
3766 int w; ///< width of pict, undefined when pict is not set
3767 int h; ///< height of pict, undefined when pict is not set
3768 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3771 * data+linesize for the bitmap of this subtitle.
3772 * can be set for text/ass as well once they are rendered
3775 enum AVSubtitleType type;
3777 char *text; ///< 0 terminated plain UTF-8 text
3780 * 0 terminated ASS/SSA compatible event line.
3781 * The presentation of this is unaffected by the other values in this
3789 typedef struct AVSubtitle {
3790 uint16_t format; /* 0 = graphics */
3791 uint32_t start_display_time; /* relative to packet pts, in ms */
3792 uint32_t end_display_time; /* relative to packet pts, in ms */
3794 AVSubtitleRect **rects;
3795 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3799 * If c is NULL, returns the first registered codec,
3800 * if c is non-NULL, returns the next registered codec after c,
3801 * or NULL if c is the last one.
3803 AVCodec *av_codec_next(const AVCodec *c);
3806 * Return the LIBAVCODEC_VERSION_INT constant.
3808 unsigned avcodec_version(void);
3811 * Return the libavcodec build-time configuration.
3813 const char *avcodec_configurati