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"
45 #if FF_API_FAST_MALLOC
46 // to provide fast_*alloc
47 #include "libavutil/mem.h"
51 * @defgroup libavc Encoding/Decoding Library
54 * @defgroup lavc_decoding Decoding
58 * @defgroup lavc_encoding Encoding
62 * @defgroup lavc_codec Codecs
64 * @defgroup lavc_codec_native Native Codecs
67 * @defgroup lavc_codec_wrappers External library wrappers
70 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
74 * @defgroup lavc_internal Internal
82 * @defgroup lavc_core Core functions/structures.
85 * Basic definitions, functions for querying libavcodec capabilities,
86 * allocating core structures, etc.
92 * Identify the syntax and semantics of the bitstream.
93 * The principle is roughly:
94 * Two decoders with the same ID can decode the same streams.
95 * Two encoders with the same ID can encode compatible streams.
96 * There may be slight deviations from the principle due to implementation
99 * If you add a codec ID to this list, add it so that
100 * 1. no value of a existing codec ID changes (that would break ABI),
101 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
102 * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts.
104 * After adding new codec IDs, do not forget to add an entry to the codec
105 * descriptor list and bump libavcodec minor version.
111 AV_CODEC_ID_MPEG1VIDEO,
112 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
114 AV_CODEC_ID_MPEG2VIDEO_XVMC,
115 #endif /* FF_API_XVMC */
126 AV_CODEC_ID_RAWVIDEO,
127 AV_CODEC_ID_MSMPEG4V1,
128 AV_CODEC_ID_MSMPEG4V2,
129 AV_CODEC_ID_MSMPEG4V3,
152 AV_CODEC_ID_INTERPLAY_VIDEO,
159 AV_CODEC_ID_MSVIDEO1,
164 AV_CODEC_ID_TRUEMOTION1,
165 AV_CODEC_ID_VMDVIDEO,
190 AV_CODEC_ID_TRUEMOTION2,
196 AV_CODEC_ID_SMACKVIDEO,
201 AV_CODEC_ID_JPEG2000,
207 AV_CODEC_ID_DSICINVIDEO,
208 AV_CODEC_ID_TIERTEXSEQVIDEO,
216 AV_CODEC_ID_BETHSOFTVID,
228 AV_CODEC_ID_ESCAPE124,
232 AV_CODEC_ID_MOTIONPIXELS,
244 AV_CODEC_ID_FLASHSV2,
245 AV_CODEC_ID_CDGRAPHICS,
248 AV_CODEC_ID_BINKVIDEO,
249 AV_CODEC_ID_IFF_ILBM,
250 AV_CODEC_ID_IFF_BYTERUN1,
256 AV_CODEC_ID_A64_MULTI,
257 AV_CODEC_ID_A64_MULTI5,
260 AV_CODEC_ID_LAGARITH,
264 AV_CODEC_ID_WMV3IMAGE,
265 AV_CODEC_ID_VC1IMAGE,
267 AV_CODEC_ID_BMV_VIDEO,
274 AV_CODEC_ID_ZEROCODEC,
283 AV_CODEC_ID_ESCAPE130_DEPRECATED,
284 AV_CODEC_ID_G2M_DEPRECATED,
285 AV_CODEC_ID_WEBP_DEPRECATED,
286 AV_CODEC_ID_HNM4_VIDEO,
287 AV_CODEC_ID_HEVC_DEPRECATED,
289 AV_CODEC_ID_ALIAS_PIX,
290 AV_CODEC_ID_BRENDER_PIX_DEPRECATED,
291 AV_CODEC_ID_PAF_VIDEO_DEPRECATED,
292 AV_CODEC_ID_EXR_DEPRECATED,
293 AV_CODEC_ID_VP7_DEPRECATED,
295 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
296 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
297 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
298 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
299 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
301 AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
302 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
303 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
304 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
305 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
306 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
307 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
308 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
309 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
310 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
311 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
312 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
313 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
314 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
315 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
316 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
317 AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'),
318 AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'),
319 AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'),
320 AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'),
321 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
322 AV_CODEC_ID_VP7 = MKBETAG('V','P','7','0'),
324 /* various PCM "codecs" */
325 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
326 AV_CODEC_ID_PCM_S16LE = 0x10000,
327 AV_CODEC_ID_PCM_S16BE,
328 AV_CODEC_ID_PCM_U16LE,
329 AV_CODEC_ID_PCM_U16BE,
332 AV_CODEC_ID_PCM_MULAW,
333 AV_CODEC_ID_PCM_ALAW,
334 AV_CODEC_ID_PCM_S32LE,
335 AV_CODEC_ID_PCM_S32BE,
336 AV_CODEC_ID_PCM_U32LE,
337 AV_CODEC_ID_PCM_U32BE,
338 AV_CODEC_ID_PCM_S24LE,
339 AV_CODEC_ID_PCM_S24BE,
340 AV_CODEC_ID_PCM_U24LE,
341 AV_CODEC_ID_PCM_U24BE,
342 AV_CODEC_ID_PCM_S24DAUD,
343 AV_CODEC_ID_PCM_ZORK,
344 AV_CODEC_ID_PCM_S16LE_PLANAR,
346 AV_CODEC_ID_PCM_F32BE,
347 AV_CODEC_ID_PCM_F32LE,
348 AV_CODEC_ID_PCM_F64BE,
349 AV_CODEC_ID_PCM_F64LE,
350 AV_CODEC_ID_PCM_BLURAY,
353 AV_CODEC_ID_PCM_S8_PLANAR,
354 AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED,
355 AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED,
356 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
357 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
358 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
360 /* various ADPCM codecs */
361 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
362 AV_CODEC_ID_ADPCM_IMA_WAV,
363 AV_CODEC_ID_ADPCM_IMA_DK3,
364 AV_CODEC_ID_ADPCM_IMA_DK4,
365 AV_CODEC_ID_ADPCM_IMA_WS,
366 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
367 AV_CODEC_ID_ADPCM_MS,
368 AV_CODEC_ID_ADPCM_4XM,
369 AV_CODEC_ID_ADPCM_XA,
370 AV_CODEC_ID_ADPCM_ADX,
371 AV_CODEC_ID_ADPCM_EA,
372 AV_CODEC_ID_ADPCM_G726,
373 AV_CODEC_ID_ADPCM_CT,
374 AV_CODEC_ID_ADPCM_SWF,
375 AV_CODEC_ID_ADPCM_YAMAHA,
376 AV_CODEC_ID_ADPCM_SBPRO_4,
377 AV_CODEC_ID_ADPCM_SBPRO_3,
378 AV_CODEC_ID_ADPCM_SBPRO_2,
379 AV_CODEC_ID_ADPCM_THP,
380 AV_CODEC_ID_ADPCM_IMA_AMV,
381 AV_CODEC_ID_ADPCM_EA_R1,
382 AV_CODEC_ID_ADPCM_EA_R3,
383 AV_CODEC_ID_ADPCM_EA_R2,
384 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
385 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
386 AV_CODEC_ID_ADPCM_EA_XAS,
387 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
388 AV_CODEC_ID_ADPCM_IMA_ISS,
389 AV_CODEC_ID_ADPCM_G722,
390 AV_CODEC_ID_ADPCM_IMA_APC,
391 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
392 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
393 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
394 AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '),
395 AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '),
396 AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'),
399 AV_CODEC_ID_AMR_NB = 0x12000,
402 /* RealAudio codecs*/
403 AV_CODEC_ID_RA_144 = 0x13000,
406 /* various DPCM codecs */
407 AV_CODEC_ID_ROQ_DPCM = 0x14000,
408 AV_CODEC_ID_INTERPLAY_DPCM,
409 AV_CODEC_ID_XAN_DPCM,
410 AV_CODEC_ID_SOL_DPCM,
413 AV_CODEC_ID_MP2 = 0x15000,
414 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
424 AV_CODEC_ID_VMDAUDIO,
430 AV_CODEC_ID_WESTWOOD_SND1,
431 AV_CODEC_ID_GSM, ///< as in Berlin toast format
434 AV_CODEC_ID_TRUESPEECH,
436 AV_CODEC_ID_SMACKAUDIO,
439 AV_CODEC_ID_DSICINAUDIO,
441 AV_CODEC_ID_MUSEPACK7,
443 AV_CODEC_ID_GSM_MS, /* as found in WAV */
449 AV_CODEC_ID_NELLYMOSER,
450 AV_CODEC_ID_MUSEPACK8,
452 AV_CODEC_ID_WMAVOICE,
454 AV_CODEC_ID_WMALOSSLESS,
463 AV_CODEC_ID_BINKAUDIO_RDFT,
464 AV_CODEC_ID_BINKAUDIO_DCT,
465 AV_CODEC_ID_AAC_LATM,
470 AV_CODEC_ID_8SVX_EXP,
471 AV_CODEC_ID_8SVX_FIB,
472 AV_CODEC_ID_BMV_AUDIO,
476 AV_CODEC_ID_OPUS_DEPRECATED,
477 AV_CODEC_ID_COMFORT_NOISE,
478 AV_CODEC_ID_TAK_DEPRECATED,
479 AV_CODEC_ID_METASOUND,
480 AV_CODEC_ID_PAF_AUDIO_DEPRECATED,
481 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
482 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
483 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
484 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
485 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
486 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
487 AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
488 AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
490 /* subtitle codecs */
491 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
492 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
493 AV_CODEC_ID_DVB_SUBTITLE,
494 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
497 AV_CODEC_ID_MOV_TEXT,
498 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
499 AV_CODEC_ID_DVB_TELETEXT,
501 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
502 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
503 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
504 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
505 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
506 AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
507 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
508 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
509 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
510 AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
511 AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
512 AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
513 AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska
515 /* other specific kind of codecs (generally used for attachments) */
516 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
517 AV_CODEC_ID_TTF = 0x18000,
518 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
519 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
520 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
521 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
522 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
523 AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
524 AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'),
527 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
529 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
530 * stream (only used by libavformat) */
531 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
532 * stream (only used by libavformat) */
533 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
536 #include "old_codec_ids.h"
541 * This struct describes the properties of a single codec described by an
543 * @see avcodec_get_descriptor()
545 typedef struct AVCodecDescriptor {
547 enum AVMediaType type;
549 * Name of the codec described by this descriptor. It is non-empty and
550 * unique for each codec descriptor. It should contain alphanumeric
551 * characters and '_' only.
555 * A more descriptive name for this codec. May be NULL.
557 const char *long_name;
559 * Codec properties, a combination of AV_CODEC_PROP_* flags.
565 * Codec uses only intra compression.
568 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
570 * Codec supports lossy compression. Audio and video codecs only.
571 * @note a codec may support both lossy and lossless
574 #define AV_CODEC_PROP_LOSSY (1 << 1)
576 * Codec supports lossless compression. Audio and video codecs only.
578 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
580 * Subtitle codec is bitmap based
581 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
583 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
585 * Subtitle codec is text based.
586 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
588 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
591 * @ingroup lavc_decoding
592 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
593 * This is mainly needed because some optimized bitstream readers read
594 * 32 or 64 bit at once and could read over the end.<br>
595 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
596 * MPEG bitstreams could cause overread and segfault.
598 #define FF_INPUT_BUFFER_PADDING_SIZE 16
601 * @ingroup lavc_encoding
602 * minimum encoding buffer size
603 * Used to avoid some checks during header writing.
605 #define FF_MIN_BUFFER_SIZE 16384
609 * @ingroup lavc_encoding
610 * motion estimation type.
613 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
617 ME_EPZS, ///< enhanced predictive zonal search
618 ME_X1, ///< reserved for experiments
619 ME_HEX, ///< hexagon based search
620 ME_UMH, ///< uneven multi-hexagon search
621 ME_TESA, ///< transformed exhaustive search algorithm
622 ME_ITER=50, ///< iterative search
626 * @ingroup lavc_decoding
629 /* We leave some space between them for extensions (drop some
630 * keyframes for intra-only or drop just some bidir frames). */
631 AVDISCARD_NONE =-16, ///< discard nothing
632 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
633 AVDISCARD_NONREF = 8, ///< discard all non reference
634 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
635 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
636 AVDISCARD_ALL = 48, ///< discard all
639 enum AVColorPrimaries{
640 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
641 AVCOL_PRI_UNSPECIFIED = 2,
642 AVCOL_PRI_BT470M = 4,
643 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
644 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
645 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
647 AVCOL_PRI_BT2020 = 9, ///< ITU-R BT2020
648 AVCOL_PRI_NB , ///< Not part of ABI
651 enum AVColorTransferCharacteristic{
652 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
653 AVCOL_TRC_UNSPECIFIED = 2,
654 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
655 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
656 AVCOL_TRC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 or 625 / ITU-R BT1358 525 or 625 / ITU-R BT1700 NTSC
657 AVCOL_TRC_SMPTE240M = 7,
658 AVCOL_TRC_LINEAR = 8, ///< "Linear transfer characteristics"
659 AVCOL_TRC_LOG = 9, ///< "Logarithmic transfer characteristic (100:1 range)"
660 AVCOL_TRC_LOG_SQRT = 10, ///< "Logarithmic transfer characteristic (100 * Sqrt( 10 ) : 1 range)"
661 AVCOL_TRC_IEC61966_2_4 = 11, ///< IEC 61966-2-4
662 AVCOL_TRC_BT1361_ECG = 12, ///< ITU-R BT1361 Extended Colour Gamut
663 AVCOL_TRC_IEC61966_2_1 = 13, ///< IEC 61966-2-1 (sRGB or sYCC)
664 AVCOL_TRC_BT2020_10 = 14, ///< ITU-R BT2020 for 10 bit system
665 AVCOL_TRC_BT2020_12 = 15, ///< ITU-R BT2020 for 12 bit system
666 AVCOL_TRC_NB , ///< Not part of ABI
670 * X X 3 4 X X are luma samples,
671 * 1 2 1-6 are possible chroma positions
672 * X X 5 6 X 0 is undefined/unknown position
674 enum AVChromaLocation{
675 AVCHROMA_LOC_UNSPECIFIED = 0,
676 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
677 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
678 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
679 AVCHROMA_LOC_TOP = 4,
680 AVCHROMA_LOC_BOTTOMLEFT = 5,
681 AVCHROMA_LOC_BOTTOM = 6,
682 AVCHROMA_LOC_NB , ///< Not part of ABI
685 enum AVAudioServiceType {
686 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
687 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
688 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
689 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
690 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
691 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
692 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
693 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
694 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
695 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
699 * @ingroup lavc_encoding
701 typedef struct RcOverride{
704 int qscale; // If this is 0 then quality_factor will be used instead.
705 float quality_factor;
708 #if FF_API_MAX_BFRAMES
710 * @deprecated there is no libavcodec-wide limit on the number of B-frames
712 #define FF_MAX_B_FRAMES 16
716 These flags can be passed in AVCodecContext.flags before initialization.
717 Note: Not everything is supported yet.
721 * Allow decoders to produce frames with data planes that are not aligned
722 * to CPU requirements (e.g. due to cropping).
724 #define CODEC_FLAG_UNALIGNED 0x0001
725 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
726 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
727 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
728 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
729 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
730 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
732 * The parent program guarantees that the input for B-frames containing
733 * streams is not written to for at least s->max_b_frames+1 frames, if
734 * this is not set the input will be copied.
736 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
737 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
738 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
739 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
742 * @deprecated edges are not used/required anymore. I.e. this flag is now always
745 #define CODEC_FLAG_EMU_EDGE 0x4000
747 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
748 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
749 location instead of only at frame boundaries. */
750 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
751 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
752 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
753 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
754 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
755 /* Fx : Flag for h263+ extra options */
756 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
757 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
758 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
759 #define CODEC_FLAG_CLOSED_GOP 0x80000000
760 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
761 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
762 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
763 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
764 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
766 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
767 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
769 /* Unsupported options :
770 * Syntax Arithmetic coding (SAC)
771 * Reference Picture Selection
772 * Independent Segment Decoding */
774 /* codec capabilities */
776 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
778 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
779 * If not set, it might not use get_buffer() at all or use operations that
780 * assume the buffer was allocated by avcodec_default_get_buffer.
782 #define CODEC_CAP_DR1 0x0002
783 #define CODEC_CAP_TRUNCATED 0x0008
785 /* Codec can export data for HW decoding. This flag indicates that
786 * the codec would call get_format() with list that might contain HW accelerated
787 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
788 * including raw image format.
789 * The application can use the passed context to determine bitstream version,
790 * chroma format, resolution etc.
792 #define CODEC_CAP_HWACCEL 0x0010
793 #endif /* FF_API_XVMC */
795 * Encoder or decoder requires flushing with NULL input at the end in order to
796 * give the complete and correct output.
798 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
799 * with NULL data. The user can still send NULL data to the public encode
800 * or decode function, but libavcodec will not pass it along to the codec
801 * unless this flag is set.
804 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
805 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
809 * The encoder needs to be fed with NULL data at the end of encoding until the
810 * encoder no longer returns data.
812 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
813 * flag also means that the encoder must set the pts and duration for
814 * each output packet. If this flag is not set, the pts and duration will
815 * be determined by libavcodec from the input frame.
817 #define CODEC_CAP_DELAY 0x0020
819 * Codec can be fed a final frame with a smaller size.
820 * This can be used to prevent truncation of the last audio samples.
822 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
825 * Codec can export data for HW decoding (VDPAU).
827 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
830 * Codec can output multiple frames per AVPacket
831 * Normally demuxers return one frame at a time, demuxers which do not do
832 * are connected to a parser to split what they return into proper frames.
833 * This flag is reserved to the very rare category of codecs which have a
834 * bitstream that cannot be split into frames without timeconsuming
835 * operations like full decoding. Demuxers carring such bitstreams thus
836 * may return multiple frames in a packet. This has many disadvantages like
837 * prohibiting stream copy in many cases thus it should only be considered
840 #define CODEC_CAP_SUBFRAMES 0x0100
842 * Codec is experimental and is thus avoided in favor of non experimental
845 #define CODEC_CAP_EXPERIMENTAL 0x0200
847 * Codec should fill in channel configuration and samplerate instead of container
849 #define CODEC_CAP_CHANNEL_CONF 0x0400
850 #if FF_API_NEG_LINESIZES
852 * @deprecated no codecs use this capability
854 #define CODEC_CAP_NEG_LINESIZES 0x0800
857 * Codec supports frame-level multithreading.
859 #define CODEC_CAP_FRAME_THREADS 0x1000
861 * Codec supports slice-based (or partition-based) multithreading.
863 #define CODEC_CAP_SLICE_THREADS 0x2000
865 * Codec supports changed parameters at any point.
867 #define CODEC_CAP_PARAM_CHANGE 0x4000
869 * Codec supports avctx->thread_count == 0 (auto).
871 #define CODEC_CAP_AUTO_THREADS 0x8000
873 * Audio encoder supports receiving a different number of samples in each call.
875 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
877 * Codec is intra only.
879 #define CODEC_CAP_INTRA_ONLY 0x40000000
883 #define CODEC_CAP_LOSSLESS 0x80000000
886 //The following defines may change, don't expect compatibility if you use them.
887 #define MB_TYPE_INTRA4x4 0x0001
888 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
889 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
890 #define MB_TYPE_16x16 0x0008
891 #define MB_TYPE_16x8 0x0010
892 #define MB_TYPE_8x16 0x0020
893 #define MB_TYPE_8x8 0x0040
894 #define MB_TYPE_INTERLACED 0x0080
895 #define MB_TYPE_DIRECT2 0x0100 //FIXME
896 #define MB_TYPE_ACPRED 0x0200
897 #define MB_TYPE_GMC 0x0400
898 #define MB_TYPE_SKIP 0x0800
899 #define MB_TYPE_P0L0 0x1000
900 #define MB_TYPE_P1L0 0x2000
901 #define MB_TYPE_P0L1 0x4000
902 #define MB_TYPE_P1L1 0x8000
903 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
904 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
905 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
906 #define MB_TYPE_QUANT 0x00010000
907 #define MB_TYPE_CBP 0x00020000
908 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
913 * This specifies the area which should be displayed.
914 * Note there may be multiple such areas for one frame.
916 typedef struct AVPanScan{
919 * - encoding: Set by user.
920 * - decoding: Set by libavcodec.
925 * width and height in 1/16 pel
926 * - encoding: Set by user.
927 * - decoding: Set by libavcodec.
933 * position of the top left corner in 1/16 pel for up to 3 fields/frames
934 * - encoding: Set by user.
935 * - decoding: Set by libavcodec.
937 int16_t position[3][2];
940 #if FF_API_QSCALE_TYPE
941 #define FF_QSCALE_TYPE_MPEG1 0
942 #define FF_QSCALE_TYPE_MPEG2 1
943 #define FF_QSCALE_TYPE_H264 2
944 #define FF_QSCALE_TYPE_VP56 3
947 #if FF_API_GET_BUFFER
948 #define FF_BUFFER_TYPE_INTERNAL 1
949 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
950 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
951 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
953 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
954 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
955 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
956 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
960 * The decoder will keep a reference to the frame and may reuse it later.
962 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
965 * @defgroup lavc_packet AVPacket
967 * Types and functions for working with AVPacket.
970 enum AVPacketSideDataType {
972 AV_PKT_DATA_NEW_EXTRADATA,
975 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
978 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
979 * s32le channel_count
980 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
981 * u64le channel_layout
982 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
984 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
989 AV_PKT_DATA_PARAM_CHANGE,
992 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
993 * structures with info about macroblocks relevant to splitting the
994 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
995 * That is, it does not necessarily contain info about all macroblocks,
996 * as long as the distance between macroblocks in the info is smaller
997 * than the target payload size.
998 * Each MB info structure is 12 bytes, and is laid out as follows:
1000 * u32le bit offset from the start of the packet
1001 * u8 current quantizer at the start of the macroblock
1003 * u16le macroblock address within the GOB
1004 * u8 horizontal MV predictor
1005 * u8 vertical MV predictor
1006 * u8 horizontal MV predictor for block number 3
1007 * u8 vertical MV predictor for block number 3
1010 AV_PKT_DATA_H263_MB_INFO,
1013 * This side data should be associated with an audio stream and contains
1014 * ReplayGain information in form of the AVReplayGain struct.
1016 AV_PKT_DATA_REPLAYGAIN,
1019 * Recommmends skipping the specified number of samples
1021 * u32le number of samples to skip from start of this packet
1022 * u32le number of samples to skip from end of this packet
1023 * u8 reason for start skip
1024 * u8 reason for end skip (0=padding silence, 1=convergence)
1027 AV_PKT_DATA_SKIP_SAMPLES=70,
1030 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1031 * the packet may contain "dual mono" audio specific to Japanese DTV
1032 * and if it is true, recommends only the selected channel to be used.
1034 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1037 AV_PKT_DATA_JP_DUALMONO,
1040 * A list of zero terminated key/value strings. There is no end marker for
1041 * the list, so it is required to rely on the side data size to stop.
1043 AV_PKT_DATA_STRINGS_METADATA,
1046 * Subtitle event position
1054 AV_PKT_DATA_SUBTITLE_POSITION,
1057 * Data found in BlockAdditional element of matroska container. There is
1058 * no end marker for the data, so it is required to rely on the side data
1059 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1062 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1065 * The optional first identifier line of a WebVTT cue.
1067 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1070 * The optional settings (rendering instructions) that immediately
1071 * follow the timestamp specifier of a WebVTT cue.
1073 AV_PKT_DATA_WEBVTT_SETTINGS,
1076 * A list of zero terminated key/value strings. There is no end marker for
1077 * the list, so it is required to rely on the side data size to stop. This
1078 * side data includes updated metadata which appeared in the stream.
1080 AV_PKT_DATA_METADATA_UPDATE,
1083 typedef struct AVPacketSideData {
1086 enum AVPacketSideDataType type;
1090 * This structure stores compressed data. It is typically exported by demuxers
1091 * and then passed as input to decoders, or received as output from encoders and
1092 * then passed to muxers.
1094 * For video, it should typically contain one compressed frame. For audio it may
1095 * contain several compressed frames.
1097 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1098 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1099 * without libavcodec and libavformat major bump.
1101 * The semantics of data ownership depends on the buf or destruct (deprecated)
1102 * fields. If either is set, the packet data is dynamically allocated and is
1103 * valid indefinitely until av_free_packet() is called (which in turn calls
1104 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1105 * the packet data is typically backed by some static buffer somewhere and is
1106 * only valid for a limited time (e.g. until the next read call when demuxing).
1108 * The side data is always allocated with av_malloc() and is freed in
1111 typedef struct AVPacket {
1113 * A reference to the reference-counted buffer where the packet data is
1115 * May be NULL, then the packet data is not reference-counted.
1119 * Presentation timestamp in AVStream->time_base units; the time at which
1120 * the decompressed packet will be presented to the user.
1121 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1122 * pts MUST be larger or equal to dts as presentation cannot happen before
1123 * decompression, unless one wants to view hex dumps. Some formats misuse
1124 * the terms dts and pts/cts to mean something different. Such timestamps
1125 * must be converted to true pts/dts before they are stored in AVPacket.
1129 * Decompression timestamp in AVStream->time_base units; the time at which
1130 * the packet is decompressed.
1131 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1138 * A combination of AV_PKT_FLAG values
1142 * Additional packet data that can be provided by the container.
1143 * Packet can contain several types of side information.
1145 AVPacketSideData *side_data;
1146 int side_data_elems;
1149 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1150 * Equals next_pts - this_pts in presentation order.
1153 #if FF_API_DESTRUCT_PACKET
1154 attribute_deprecated
1155 void (*destruct)(struct AVPacket *);
1156 attribute_deprecated
1159 int64_t pos; ///< byte position in stream, -1 if unknown
1162 * Time difference in AVStream->time_base units from the pts of this
1163 * packet to the point at which the output from the decoder has converged
1164 * independent from the availability of previous frames. That is, the
1165 * frames are virtually identical no matter if decoding started from
1166 * the very first frame or from this keyframe.
1167 * Is AV_NOPTS_VALUE if unknown.
1168 * This field is not the display duration of the current packet.
1169 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1172 * The purpose of this field is to allow seeking in streams that have no
1173 * keyframes in the conventional sense. It corresponds to the
1174 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1175 * essential for some types of subtitle streams to ensure that all
1176 * subtitles are correctly displayed after seeking.
1178 int64_t convergence_duration;
1180 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1181 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1183 enum AVSideDataParamChangeFlags {
1184 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1185 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1186 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1187 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1193 struct AVCodecInternal;
1197 AV_FIELD_PROGRESSIVE,
1198 AV_FIELD_TT, //< Top coded_first, top displayed first
1199 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1200 AV_FIELD_TB, //< Top coded first, bottom displayed first
1201 AV_FIELD_BT, //< Bottom coded first, top displayed first
1205 * main external API structure.
1206 * New fields can be added to the end with minor version bumps.
1207 * Removal, reordering and changes to existing fields require a major
1209 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1211 * sizeof(AVCodecContext) must not be used outside libav*.
1213 typedef struct AVCodecContext {
1215 * information on struct for av_log
1216 * - set by avcodec_alloc_context3
1218 const AVClass *av_class;
1219 int log_level_offset;
1221 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1222 const struct AVCodec *codec;
1223 char codec_name[32];
1224 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1227 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1228 * This is used to work around some encoder bugs.
1229 * A demuxer should set this to what is stored in the field used to identify the codec.
1230 * If there are multiple such fields in a container then the demuxer should choose the one
1231 * which maximizes the information about the used codec.
1232 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1233 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1234 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1236 * - encoding: Set by user, if not then the default based on codec_id will be used.
1237 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1239 unsigned int codec_tag;
1242 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1243 * This is used to work around some encoder bugs.
1244 * - encoding: unused
1245 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1247 unsigned int stream_codec_tag;
1252 * Private context used for internal data.
1254 * Unlike priv_data, this is not codec-specific. It is used in general
1255 * libavcodec functions.
1257 struct AVCodecInternal *internal;
1260 * Private data of the user, can be used to carry app specific stuff.
1261 * - encoding: Set by user.
1262 * - decoding: Set by user.
1267 * the average bitrate
1268 * - encoding: Set by user; unused for constant quantizer encoding.
1269 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1274 * number of bits the bitstream is allowed to diverge from the reference.
1275 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1276 * - encoding: Set by user; unused for constant quantizer encoding.
1277 * - decoding: unused
1279 int bit_rate_tolerance;
1282 * Global quality for codecs which cannot change it per frame.
1283 * This should be proportional to MPEG-1/2/4 qscale.
1284 * - encoding: Set by user.
1285 * - decoding: unused
1290 * - encoding: Set by user.
1291 * - decoding: unused
1293 int compression_level;
1294 #define FF_COMPRESSION_DEFAULT -1
1298 * - encoding: Set by user.
1299 * - decoding: Set by user.
1305 * - encoding: Set by user.
1306 * - decoding: Set by user.
1311 * some codecs need / can use extradata like Huffman tables.
1312 * mjpeg: Huffman tables
1313 * rv10: additional flags
1314 * mpeg4: global headers (they can be in the bitstream or here)
1315 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1316 * than extradata_size to avoid problems if it is read with the bitstream reader.
1317 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1318 * - encoding: Set/allocated/freed by libavcodec.
1319 * - decoding: Set/allocated/freed by user.
1325 * This is the fundamental unit of time (in seconds) in terms
1326 * of which frame timestamps are represented. For fixed-fps content,
1327 * timebase should be 1/framerate and timestamp increments should be
1329 * - encoding: MUST be set by user.
1330 * - decoding: Set by libavcodec.
1332 AVRational time_base;
1335 * For some codecs, the time base is closer to the field rate than the frame rate.
1336 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1337 * if no telecine is used ...
1339 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1341 int ticks_per_frame;
1346 * Encoding: Number of frames delay there will be from the encoder input to
1347 * the decoder output. (we assume the decoder matches the spec)
1348 * Decoding: Number of frames delay in addition to what a standard decoder
1349 * as specified in the spec would produce.
1352 * Number of frames the decoded output will be delayed relative to the
1356 * For encoding, this is the number of "priming" samples added to the
1357 * beginning of the stream. The decoded output will be delayed by this
1358 * many samples relative to the input to the encoder. Note that this
1359 * field is purely informational and does not directly affect the pts
1360 * output by the encoder, which should always be based on the actual
1361 * presentation time, including any delay.
1362 * For decoding, this is the number of samples the decoder needs to
1363 * output before the decoder's output is valid. When seeking, you should
1364 * start decoding this many samples prior to your desired seek point.
1366 * - encoding: Set by libavcodec.
1367 * - decoding: Set by libavcodec.
1374 * picture width / height.
1375 * - encoding: MUST be set by user.
1376 * - decoding: May be set by the user before opening the decoder if known e.g.
1377 * from the container. Some decoders will require the dimensions
1378 * to be set by the caller. During decoding, the decoder may
1379 * overwrite those values as required.
1384 * Bitstream width / height, may be different from width/height e.g. when
1385 * the decoded frame is cropped before being output or lowres is enabled.
1386 * - encoding: unused
1387 * - decoding: May be set by the user before opening the decoder if known
1388 * e.g. from the container. During decoding, the decoder may
1389 * overwrite those values as required.
1391 int coded_width, coded_height;
1393 #if FF_API_ASPECT_EXTENDED
1394 #define FF_ASPECT_EXTENDED 15
1398 * the number of pictures in a group of pictures, or 0 for intra_only
1399 * - encoding: Set by user.
1400 * - decoding: unused
1405 * Pixel format, see AV_PIX_FMT_xxx.
1406 * May be set by the demuxer if known from headers.
1407 * May be overridden by the decoder if it knows better.
1408 * - encoding: Set by user.
1409 * - decoding: Set by user if known, overridden by libavcodec if known
1411 enum AVPixelFormat pix_fmt;
1414 * Motion estimation algorithm used for video coding.
1415 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1416 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1417 * - encoding: MUST be set by user.
1418 * - decoding: unused
1423 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1424 * decoder to draw a horizontal band. It improves cache usage. Not
1425 * all codecs can do that. You must check the codec capabilities
1427 * When multithreading is used, it may be called from multiple threads
1428 * at the same time; threads might draw different parts of the same AVFrame,
1429 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1431 * The function is also used by hardware acceleration APIs.
1432 * It is called at least once during frame decoding to pass
1433 * the data needed for hardware render.
1434 * In that mode instead of pixel data, AVFrame points to
1435 * a structure specific to the acceleration API. The application
1436 * reads the structure and can change some fields to indicate progress
1438 * - encoding: unused
1439 * - decoding: Set by user.
1440 * @param height the height of the slice
1441 * @param y the y position of the slice
1442 * @param type 1->top field, 2->bottom field, 3->frame
1443 * @param offset offset into the AVFrame.data from which the slice should be read
1445 void (*draw_horiz_band)(struct AVCodecContext *s,
1446 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1447 int y, int type, int height);
1450 * callback to negotiate the pixelFormat
1451 * @param fmt is the list of formats which are supported by the codec,
1452 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1453 * The first is always the native one.
1454 * @return the chosen format
1455 * - encoding: unused
1456 * - decoding: Set by user, if not set the native format will be chosen.
1458 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1461 * maximum number of B-frames between non-B-frames
1462 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1463 * - encoding: Set by user.
1464 * - decoding: unused
1469 * qscale factor between IP and B-frames
1470 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1471 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1472 * - encoding: Set by user.
1473 * - decoding: unused
1475 float b_quant_factor;
1477 /** obsolete FIXME remove */
1479 #define FF_RC_STRATEGY_XVID 1
1481 int b_frame_strategy;
1484 * qscale offset between IP and B-frames
1485 * - encoding: Set by user.
1486 * - decoding: unused
1488 float b_quant_offset;
1491 * Size of the frame reordering buffer in the decoder.
1492 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1493 * - encoding: Set by libavcodec.
1494 * - decoding: Set by libavcodec.
1499 * 0-> h263 quant 1-> mpeg quant
1500 * - encoding: Set by user.
1501 * - decoding: unused
1506 * qscale factor between P and I-frames
1507 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1508 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1509 * - encoding: Set by user.
1510 * - decoding: unused
1512 float i_quant_factor;
1515 * qscale offset between P and I-frames
1516 * - encoding: Set by user.
1517 * - decoding: unused
1519 float i_quant_offset;
1522 * luminance masking (0-> disabled)
1523 * - encoding: Set by user.
1524 * - decoding: unused
1529 * temporary complexity masking (0-> disabled)
1530 * - encoding: Set by user.
1531 * - decoding: unused
1533 float temporal_cplx_masking;
1536 * spatial complexity masking (0-> disabled)
1537 * - encoding: Set by user.
1538 * - decoding: unused
1540 float spatial_cplx_masking;
1543 * p block masking (0-> disabled)
1544 * - encoding: Set by user.
1545 * - decoding: unused
1550 * darkness masking (0-> disabled)
1551 * - encoding: Set by user.
1552 * - decoding: unused
1558 * - encoding: Set by libavcodec.
1559 * - decoding: Set by user (or 0).
1563 * prediction method (needed for huffyuv)
1564 * - encoding: Set by user.
1565 * - decoding: unused
1567 int prediction_method;
1568 #define FF_PRED_LEFT 0
1569 #define FF_PRED_PLANE 1
1570 #define FF_PRED_MEDIAN 2
1573 * slice offsets in the frame in bytes
1574 * - encoding: Set/allocated by libavcodec.
1575 * - decoding: Set/allocated by user (or NULL).
1580 * sample aspect ratio (0 if unknown)
1581 * That is the width of a pixel divided by the height of the pixel.
1582 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1583 * - encoding: Set by user.
1584 * - decoding: Set by libavcodec.
1586 AVRational sample_aspect_ratio;
1589 * motion estimation comparison function
1590 * - encoding: Set by user.
1591 * - decoding: unused
1595 * subpixel motion estimation comparison function
1596 * - encoding: Set by user.
1597 * - decoding: unused
1601 * macroblock comparison function (not supported yet)
1602 * - encoding: Set by user.
1603 * - decoding: unused
1607 * interlaced DCT comparison function
1608 * - encoding: Set by user.
1609 * - decoding: unused
1612 #define FF_CMP_SAD 0
1613 #define FF_CMP_SSE 1
1614 #define FF_CMP_SATD 2
1615 #define FF_CMP_DCT 3
1616 #define FF_CMP_PSNR 4
1617 #define FF_CMP_BIT 5
1619 #define FF_CMP_ZERO 7
1620 #define FF_CMP_VSAD 8
1621 #define FF_CMP_VSSE 9
1622 #define FF_CMP_NSSE 10
1623 #define FF_CMP_W53 11
1624 #define FF_CMP_W97 12
1625 #define FF_CMP_DCTMAX 13
1626 #define FF_CMP_DCT264 14
1627 #define FF_CMP_CHROMA 256
1630 * ME diamond size & shape
1631 * - encoding: Set by user.
1632 * - decoding: unused
1637 * amount of previous MV predictors (2a+1 x 2a+1 square)
1638 * - encoding: Set by user.
1639 * - decoding: unused
1641 int last_predictor_count;
1644 * prepass for motion estimation
1645 * - encoding: Set by user.
1646 * - decoding: unused
1651 * motion estimation prepass comparison function
1652 * - encoding: Set by user.
1653 * - decoding: unused
1658 * ME prepass diamond size & shape
1659 * - encoding: Set by user.
1660 * - decoding: unused
1666 * - encoding: Set by user.
1667 * - decoding: unused
1669 int me_subpel_quality;
1672 * DTG active format information (additional aspect ratio
1673 * information only used in DVB MPEG-2 transport streams)
1676 * - encoding: unused
1677 * - decoding: Set by decoder.
1679 int dtg_active_format;
1680 #define FF_DTG_AFD_SAME 8
1681 #define FF_DTG_AFD_4_3 9
1682 #define FF_DTG_AFD_16_9 10
1683 #define FF_DTG_AFD_14_9 11
1684 #define FF_DTG_AFD_4_3_SP_14_9 13
1685 #define FF_DTG_AFD_16_9_SP_14_9 14
1686 #define FF_DTG_AFD_SP_4_3 15
1689 * maximum motion estimation search range in subpel units
1690 * If 0 then no limit.
1692 * - encoding: Set by user.
1693 * - decoding: unused
1698 * intra quantizer bias
1699 * - encoding: Set by user.
1700 * - decoding: unused
1702 int intra_quant_bias;
1703 #define FF_DEFAULT_QUANT_BIAS 999999
1706 * inter quantizer bias
1707 * - encoding: Set by user.
1708 * - decoding: unused
1710 int inter_quant_bias;
1714 * - encoding: unused
1715 * - decoding: Set by user.
1718 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1719 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1720 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1724 * XVideo Motion Acceleration
1725 * - encoding: forbidden
1726 * - decoding: set by decoder
1727 * @deprecated XvMC doesn't need it anymore.
1729 attribute_deprecated int xvmc_acceleration;
1730 #endif /* FF_API_XVMC */
1733 * macroblock decision mode
1734 * - encoding: Set by user.
1735 * - decoding: unused
1738 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1739 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1740 #define FF_MB_DECISION_RD 2 ///< rate distortion
1743 * custom intra quantization matrix
1744 * - encoding: Set by user, can be NULL.
1745 * - decoding: Set by libavcodec.
1747 uint16_t *intra_matrix;
1750 * custom inter quantization matrix
1751 * - encoding: Set by user, can be NULL.
1752 * - decoding: Set by libavcodec.
1754 uint16_t *inter_matrix;
1757 * scene change detection threshold
1758 * 0 is default, larger means fewer detected scene changes.
1759 * - encoding: Set by user.
1760 * - decoding: unused
1762 int scenechange_threshold;
1765 * noise reduction strength
1766 * - encoding: Set by user.
1767 * - decoding: unused
1769 int noise_reduction;
1772 * Motion estimation threshold below which no motion estimation is
1773 * performed, but instead the user specified motion vectors are used.
1775 * - encoding: Set by user.
1776 * - decoding: unused
1781 * Macroblock threshold below which the user specified macroblock types will be used.
1782 * - encoding: Set by user.
1783 * - decoding: unused
1788 * precision of the intra DC coefficient - 8
1789 * - encoding: Set by user.
1790 * - decoding: unused
1792 int intra_dc_precision;
1795 * Number of macroblock rows at the top which are skipped.
1796 * - encoding: unused
1797 * - decoding: Set by user.
1802 * Number of macroblock rows at the bottom which are skipped.
1803 * - encoding: unused
1804 * - decoding: Set by user.
1809 * Border processing masking, raises the quantizer for mbs on the borders
1811 * - encoding: Set by user.
1812 * - decoding: unused
1814 float border_masking;
1817 * minimum MB lagrange multipler
1818 * - encoding: Set by user.
1819 * - decoding: unused
1824 * maximum MB lagrange multipler
1825 * - encoding: Set by user.
1826 * - decoding: unused
1832 * - encoding: Set by user.
1833 * - decoding: unused
1835 int me_penalty_compensation;
1839 * - encoding: Set by user.
1840 * - decoding: unused
1846 * - encoding: Set by user.
1847 * - decoding: unused
1853 * - encoding: Set by user.
1854 * - decoding: unused
1859 * number of reference frames
1860 * - encoding: Set by user.
1861 * - decoding: Set by lavc.
1866 * chroma qp offset from luma
1867 * - encoding: Set by user.
1868 * - decoding: unused
1873 * Multiplied by qscale for each frame and added to scene_change_score.
1874 * - encoding: Set by user.
1875 * - decoding: unused
1877 int scenechange_factor;
1881 * Note: Value depends upon the compare function used for fullpel ME.
1882 * - encoding: Set by user.
1883 * - decoding: unused
1888 * Adjust sensitivity of b_frame_strategy 1.
1889 * - encoding: Set by user.
1890 * - decoding: unused
1895 * Chromaticity coordinates of the source primaries.
1896 * - encoding: Set by user
1897 * - decoding: Set by libavcodec
1899 enum AVColorPrimaries color_primaries;
1902 * Color Transfer Characteristic.
1903 * - encoding: Set by user
1904 * - decoding: Set by libavcodec
1906 enum AVColorTransferCharacteristic color_trc;
1909 * YUV colorspace type.
1910 * - encoding: Set by user
1911 * - decoding: Set by libavcodec
1913 enum AVColorSpace colorspace;
1916 * MPEG vs JPEG YUV range.
1917 * - encoding: Set by user
1918 * - decoding: Set by libavcodec
1920 enum AVColorRange color_range;
1923 * This defines the location of chroma samples.
1924 * - encoding: Set by user
1925 * - decoding: Set by libavcodec
1927 enum AVChromaLocation chroma_sample_location;
1931 * Indicates number of picture subdivisions. Used for parallelized
1933 * - encoding: Set by user
1934 * - decoding: unused
1939 * - encoding: set by libavcodec
1940 * - decoding: Set by user.
1942 enum AVFieldOrder field_order;
1945 int sample_rate; ///< samples per second
1946 int channels; ///< number of audio channels
1949 * audio sample format
1950 * - encoding: Set by user.
1951 * - decoding: Set by libavcodec.
1953 enum AVSampleFormat sample_fmt; ///< sample format
1955 /* The following data should not be initialized. */
1957 * Number of samples per channel in an audio frame.
1959 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1960 * except the last must contain exactly frame_size samples per channel.
1961 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1962 * frame size is not restricted.
1963 * - decoding: may be set by some decoders to indicate constant frame size
1968 * Frame counter, set by libavcodec.
1970 * - decoding: total number of frames returned from the decoder so far.
1971 * - encoding: total number of frames passed to the encoder so far.
1973 * @note the counter is not incremented if encoding/decoding resulted in
1979 * number of bytes per packet if constant and known or 0
1980 * Used by some WAV based audio codecs.
1985 * Audio cutoff bandwidth (0 means "automatic")
1986 * - encoding: Set by user.
1987 * - decoding: unused
1991 #if FF_API_REQUEST_CHANNELS
1993 * Decoder should decode to this many channels if it can (0 for default)
1994 * - encoding: unused
1995 * - decoding: Set by user.
1996 * @deprecated Deprecated in favor of request_channel_layout.
1998 attribute_deprecated int request_channels;
2002 * Audio channel layout.
2003 * - encoding: set by user.
2004 * - decoding: set by user, may be overwritten by libavcodec.
2006 uint64_t channel_layout;
2009 * Request decoder to use this channel layout if it can (0 for default)
2010 * - encoding: unused
2011 * - decoding: Set by user.
2013 uint64_t request_channel_layout;
2016 * Type of service that the audio stream conveys.
2017 * - encoding: Set by user.
2018 * - decoding: Set by libavcodec.
2020 enum AVAudioServiceType audio_service_type;
2023 * desired sample format
2024 * - encoding: Not used.
2025 * - decoding: Set by user.
2026 * Decoder will decode to this format if it can.
2028 enum AVSampleFormat request_sample_fmt;
2030 #if FF_API_GET_BUFFER
2032 * Called at the beginning of each frame to get a buffer for it.
2034 * The function will set AVFrame.data[], AVFrame.linesize[].
2035 * AVFrame.extended_data[] must also be set, but it should be the same as
2036 * AVFrame.data[] except for planar audio with more channels than can fit
2037 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2038 * many data pointers as it can hold.
2040 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2041 * avcodec_default_get_buffer() instead of providing buffers allocated by
2044 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2045 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2046 * but if get_buffer() is overridden then alignment considerations should
2047 * be taken into account.
2049 * @see avcodec_default_get_buffer()
2053 * If pic.reference is set then the frame will be read later by libavcodec.
2054 * avcodec_align_dimensions2() should be used to find the required width and
2055 * height, as they normally need to be rounded up to the next multiple of 16.
2057 * If frame multithreading is used and thread_safe_callbacks is set,
2058 * it may be called from a different thread, but not from more than one at
2059 * once. Does not need to be reentrant.
2061 * @see release_buffer(), reget_buffer()
2062 * @see avcodec_align_dimensions2()
2066 * Decoders request a buffer of a particular size by setting
2067 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2068 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2069 * to a smaller value in the output frame.
2071 * Decoders cannot use the buffer after returning from
2072 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2073 * is assumed to be released immediately upon return. In some rare cases,
2074 * a decoder may need to call get_buffer() more than once in a single
2075 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2076 * called again after it has already been called once, the previously
2077 * acquired buffer is assumed to be released at that time and may not be
2078 * reused by the decoder.
2080 * As a convenience, av_samples_get_buffer_size() and
2081 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2082 * functions to find the required data size and to fill data pointers and
2083 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2084 * since all planes must be the same size.
2086 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2088 * - encoding: unused
2089 * - decoding: Set by libavcodec, user can override.
2091 * @deprecated use get_buffer2()
2093 attribute_deprecated
2094 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2097 * Called to release buffers which were allocated with get_buffer.
2098 * A released buffer can be reused in get_buffer().
2099 * pic.data[*] must be set to NULL.
2100 * May be called from a different thread if frame multithreading is used,
2101 * but not by more than one thread at once, so does not need to be reentrant.
2102 * - encoding: unused
2103 * - decoding: Set by libavcodec, user can override.
2105 * @deprecated custom freeing callbacks should be set from get_buffer2()
2107 attribute_deprecated
2108 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2111 * Called at the beginning of a frame to get cr buffer for it.
2112 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2113 * libavcodec will pass previous buffer in pic, function should return
2114 * same buffer or new buffer with old frame "painted" into it.
2115 * If pic.data[0] == NULL must behave like get_buffer().
2116 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2117 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2119 * - encoding: unused
2120 * - decoding: Set by libavcodec, user can override.
2122 attribute_deprecated
2123 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2127 * This callback is called at the beginning of each frame to get data
2128 * buffer(s) for it. There may be one contiguous buffer for all the data or
2129 * there may be a buffer per each data plane or anything in between. What
2130 * this means is, you may set however many entries in buf[] you feel necessary.
2131 * Each buffer must be reference-counted using the AVBuffer API (see description
2134 * The following fields will be set in the frame before this callback is
2137 * - width, height (video only)
2138 * - sample_rate, channel_layout, nb_samples (audio only)
2139 * Their values may differ from the corresponding values in
2140 * AVCodecContext. This callback must use the frame values, not the codec
2141 * context values, to calculate the required buffer size.
2143 * This callback must fill the following fields in the frame:
2147 * * if the data is planar audio with more than 8 channels, then this
2148 * callback must allocate and fill extended_data to contain all pointers
2149 * to all data planes. data[] must hold as many pointers as it can.
2150 * extended_data must be allocated with av_malloc() and will be freed in
2152 * * otherwise exended_data must point to data
2153 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2154 * the frame's data and extended_data pointers must be contained in these. That
2155 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2156 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2157 * and av_buffer_ref().
2158 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2159 * this callback and filled with the extra buffers if there are more
2160 * buffers than buf[] can hold. extended_buf will be freed in
2163 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2164 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2167 * Each data plane must be aligned to the maximum required by the target
2170 * @see avcodec_default_get_buffer2()
2174 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2175 * (read and/or written to if it is writable) later by libavcodec.
2177 * avcodec_align_dimensions2() should be used to find the required width and
2178 * height, as they normally need to be rounded up to the next multiple of 16.
2180 * Some decoders do not support linesizes changing between frames.
2182 * If frame multithreading is used and thread_safe_callbacks is set,
2183 * this callback may be called from a different thread, but not from more
2184 * than one at once. Does not need to be reentrant.
2186 * @see avcodec_align_dimensions2()
2190 * Decoders request a buffer of a particular size by setting
2191 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2192 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2193 * to a smaller value in the output frame.
2195 * As a convenience, av_samples_get_buffer_size() and
2196 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2197 * functions to find the required data size and to fill data pointers and
2198 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2199 * since all planes must be the same size.
2201 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2203 * - encoding: unused
2204 * - decoding: Set by libavcodec, user can override.
2206 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2209 * If non-zero, the decoded audio and video frames returned from
2210 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2211 * and are valid indefinitely. The caller must free them with
2212 * av_frame_unref() when they are not needed anymore.
2213 * Otherwise, the decoded frames must not be freed by the caller and are
2214 * only valid until the next decode call.
2216 * - encoding: unused
2217 * - decoding: set by the caller before avcodec_open2().
2219 int refcounted_frames;
2221 /* - encoding parameters */
2222 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2223 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2227 * - encoding: Set by user.
2228 * - decoding: unused
2234 * - encoding: Set by user.
2235 * - decoding: unused
2240 * maximum quantizer difference between frames
2241 * - encoding: Set by user.
2242 * - decoding: unused
2247 * ratecontrol qmin qmax limiting method
2248 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2249 * - encoding: Set by user.
2250 * - decoding: unused
2258 * decoder bitstream buffer size
2259 * - encoding: Set by user.
2260 * - decoding: unused
2265 * ratecontrol override, see RcOverride
2266 * - encoding: Allocated/set/freed by user.
2267 * - decoding: unused
2269 int rc_override_count;
2270 RcOverride *rc_override;
2273 * rate control equation
2274 * - encoding: Set by user
2275 * - decoding: unused
2281 * - encoding: Set by user.
2282 * - decoding: unused
2288 * - encoding: Set by user.
2289 * - decoding: unused
2293 float rc_buffer_aggressivity;
2296 * initial complexity for pass1 ratecontrol
2297 * - encoding: Set by user.
2298 * - decoding: unused
2300 float rc_initial_cplx;
2303 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2304 * - encoding: Set by user.
2305 * - decoding: unused.
2307 float rc_max_available_vbv_use;
2310 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2311 * - encoding: Set by user.
2312 * - decoding: unused.
2314 float rc_min_vbv_overflow_use;
2317 * Number of bits which should be loaded into the rc buffer before decoding starts.
2318 * - encoding: Set by user.
2319 * - decoding: unused
2321 int rc_initial_buffer_occupancy;
2323 #define FF_CODER_TYPE_VLC 0
2324 #define FF_CODER_TYPE_AC 1
2325 #define FF_CODER_TYPE_RAW 2
2326 #define FF_CODER_TYPE_RLE 3
2327 #define FF_CODER_TYPE_DEFLATE 4
2330 * - encoding: Set by user.
2331 * - decoding: unused
2337 * - encoding: Set by user.
2338 * - decoding: unused
2343 * minimum Lagrange multipler
2344 * - encoding: Set by user.
2345 * - decoding: unused
2350 * maximum Lagrange multipler
2351 * - encoding: Set by user.
2352 * - decoding: unused
2357 * frame skip threshold
2358 * - encoding: Set by user.
2359 * - decoding: unused
2361 int frame_skip_threshold;
2365 * - encoding: Set by user.
2366 * - decoding: unused
2368 int frame_skip_factor;
2371 * frame skip exponent
2372 * - encoding: Set by user.
2373 * - decoding: unused
2378 * frame skip comparison function
2379 * - encoding: Set by user.
2380 * - decoding: unused
2385 * trellis RD quantization
2386 * - encoding: Set by user.
2387 * - decoding: unused
2392 * - encoding: Set by user.
2393 * - decoding: unused
2395 int min_prediction_order;
2398 * - encoding: Set by user.
2399 * - decoding: unused
2401 int max_prediction_order;
2404 * GOP timecode frame start number
2405 * - encoding: Set by user, in non drop frame format
2406 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2408 int64_t timecode_frame_start;
2410 /* The RTP callback: This function is called */
2411 /* every time the encoder has a packet to send. */
2412 /* It depends on the encoder if the data starts */
2413 /* with a Start Code (it should). H.263 does. */
2414 /* mb_nb contains the number of macroblocks */
2415 /* encoded in the RTP payload. */
2416 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2418 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2419 /* do its best to deliver a chunk with size */
2420 /* below rtp_payload_size, the chunk will start */
2421 /* with a start code on some codecs like H.263. */
2422 /* This doesn't take account of any particular */
2423 /* headers inside the transmitted RTP payload. */
2425 /* statistics, used for 2-pass encoding */
2436 * number of bits used for the previously encoded frame
2437 * - encoding: Set by libavcodec.
2438 * - decoding: unused
2443 * pass1 encoding statistics output buffer
2444 * - encoding: Set by libavcodec.
2445 * - decoding: unused
2450 * pass2 encoding statistics input buffer
2451 * Concatenated stuff from stats_out of pass1 should be placed here.
2452 * - encoding: Allocated/set/freed by user.
2453 * - decoding: unused
2458 * Work around bugs in encoders which sometimes cannot be detected automatically.
2459 * - encoding: Set by user
2460 * - decoding: Set by user
2462 int workaround_bugs;
2463 #define FF_BUG_AUTODETECT 1 ///< autodetection
2464 #if FF_API_OLD_MSMPEG4
2465 #define FF_BUG_OLD_MSMPEG4 2
2467 #define FF_BUG_XVID_ILACE 4
2468 #define FF_BUG_UMP4 8
2469 #define FF_BUG_NO_PADDING 16
2470 #define FF_BUG_AMV 32
2472 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2474 #define FF_BUG_QPEL_CHROMA 64
2475 #define FF_BUG_STD_QPEL 128
2476 #define FF_BUG_QPEL_CHROMA2 256
2477 #define FF_BUG_DIRECT_BLOCKSIZE 512
2478 #define FF_BUG_EDGE 1024
2479 #define FF_BUG_HPEL_CHROMA 2048
2480 #define FF_BUG_DC_CLIP 4096
2481 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2482 #define FF_BUG_TRUNCATED 16384
2485 * strictly follow the standard (MPEG4, ...).
2486 * - encoding: Set by user.
2487 * - decoding: Set by user.
2488 * Setting this to STRICT or higher means the encoder and decoder will
2489 * generally do stupid things, whereas setting it to unofficial or lower
2490 * will mean the encoder might produce output that is not supported by all
2491 * spec-compliant decoders. Decoders don't differentiate between normal,
2492 * unofficial and experimental (that is, they always try to decode things
2493 * when they can) unless they are explicitly asked to behave stupidly
2494 * (=strictly conform to the specs)
2496 int strict_std_compliance;
2497 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2498 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2499 #define FF_COMPLIANCE_NORMAL 0
2500 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2501 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2504 * error concealment flags
2505 * - encoding: unused
2506 * - decoding: Set by user.
2508 int error_concealment;
2509 #define FF_EC_GUESS_MVS 1
2510 #define FF_EC_DEBLOCK 2
2514 * - encoding: Set by user.
2515 * - decoding: Set by user.
2518 #define FF_DEBUG_PICT_INFO 1
2519 #define FF_DEBUG_RC 2
2520 #define FF_DEBUG_BITSTREAM 4
2521 #define FF_DEBUG_MB_TYPE 8
2522 #define FF_DEBUG_QP 16
2525 * @deprecated this option does nothing
2527 #define FF_DEBUG_MV 32
2529 #define FF_DEBUG_DCT_COEFF 0x00000040
2530 #define FF_DEBUG_SKIP 0x00000080
2531 #define FF_DEBUG_STARTCODE 0x00000100
2532 #define FF_DEBUG_PTS 0x00000200
2533 #define FF_DEBUG_ER 0x00000400
2534 #define FF_DEBUG_MMCO 0x00000800
2535 #define FF_DEBUG_BUGS 0x00001000
2537 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2538 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2540 #define FF_DEBUG_BUFFERS 0x00008000
2541 #define FF_DEBUG_THREADS 0x00010000
2546 * Code outside libavcodec should access this field using AVOptions
2547 * - encoding: Set by user.
2548 * - decoding: Set by user.
2551 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2552 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2553 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2557 * Error recognition; may misdetect some more or less valid parts as errors.
2558 * - encoding: unused
2559 * - decoding: Set by user.
2561 int err_recognition;
2564 * Verify checksums embedded in the bitstream (could be of either encoded or
2565 * decoded data, depending on the codec) and print an error message on mismatch.
2566 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2567 * decoder returning an error.
2569 #define AV_EF_CRCCHECK (1<<0)
2570 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2571 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2572 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2574 #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
2575 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliancies as errors
2576 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2580 * opaque 64bit number (generally a PTS) that will be reordered and
2581 * output in AVFrame.reordered_opaque
2582 * @deprecated in favor of pkt_pts
2583 * - encoding: unused
2584 * - decoding: Set by user.
2586 int64_t reordered_opaque;
2589 * Hardware accelerator in use
2590 * - encoding: unused.
2591 * - decoding: Set by libavcodec
2593 struct AVHWAccel *hwaccel;
2596 * Hardware accelerator context.
2597 * For some hardware accelerators, a global context needs to be
2598 * provided by the user. In that case, this holds display-dependent
2599 * data FFmpeg cannot instantiate itself. Please refer to the
2600 * FFmpeg HW accelerator documentation to know how to fill this
2601 * is. e.g. for VA API, this is a struct vaapi_context.
2602 * - encoding: unused
2603 * - decoding: Set by user
2605 void *hwaccel_context;
2609 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2610 * - decoding: unused
2612 uint64_t error[AV_NUM_DATA_POINTERS];
2615 * DCT algorithm, see FF_DCT_* below
2616 * - encoding: Set by user.
2617 * - decoding: unused
2620 #define FF_DCT_AUTO 0
2621 #define FF_DCT_FASTINT 1
2622 #define FF_DCT_INT 2
2623 #define FF_DCT_MMX 3
2624 #define FF_DCT_ALTIVEC 5
2625 #define FF_DCT_FAAN 6
2628 * IDCT algorithm, see FF_IDCT_* below.
2629 * - encoding: Set by user.
2630 * - decoding: Set by user.
2633 #define FF_IDCT_AUTO 0
2634 #define FF_IDCT_INT 1
2635 #define FF_IDCT_SIMPLE 2
2636 #define FF_IDCT_SIMPLEMMX 3
2637 #define FF_IDCT_ARM 7
2638 #define FF_IDCT_ALTIVEC 8
2640 #define FF_IDCT_SH4 9
2642 #define FF_IDCT_SIMPLEARM 10
2643 #define FF_IDCT_IPP 13
2644 #define FF_IDCT_XVIDMMX 14
2645 #define FF_IDCT_SIMPLEARMV5TE 16
2646 #define FF_IDCT_SIMPLEARMV6 17
2647 #if FF_API_ARCH_SPARC
2648 #define FF_IDCT_SIMPLEVIS 18
2650 #define FF_IDCT_FAAN 20
2651 #define FF_IDCT_SIMPLENEON 22
2652 #if FF_API_ARCH_ALPHA
2653 #define FF_IDCT_SIMPLEALPHA 23
2657 * bits per sample/pixel from the demuxer (needed for huffyuv).
2658 * - encoding: Set by libavcodec.
2659 * - decoding: Set by user.
2661 int bits_per_coded_sample;
2664 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2665 * - encoding: set by user.
2666 * - decoding: set by libavcodec.
2668 int bits_per_raw_sample;
2672 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2673 * - encoding: unused
2674 * - decoding: Set by user.
2675 * Code outside libavcodec should access this field using:
2676 * av_codec_{get,set}_lowres(avctx)
2682 * the picture in the bitstream
2683 * - encoding: Set by libavcodec.
2684 * - decoding: unused
2686 AVFrame *coded_frame;
2690 * is used to decide how many independent tasks should be passed to execute()
2691 * - encoding: Set by user.
2692 * - decoding: Set by user.
2697 * Which multithreading methods to use.
2698 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2699 * so clients which cannot provide future frames should not use it.
2701 * - encoding: Set by user, otherwise the default is used.
2702 * - decoding: Set by user, otherwise the default is used.
2705 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2706 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2709 * Which multithreading methods are in use by the codec.
2710 * - encoding: Set by libavcodec.
2711 * - decoding: Set by libavcodec.
2713 int active_thread_type;
2716 * Set by the client if its custom get_buffer() callback can be called
2717 * synchronously from another thread, which allows faster multithreaded decoding.
2718 * draw_horiz_band() will be called from other threads regardless of this setting.
2719 * Ignored if the default get_buffer() is used.
2720 * - encoding: Set by user.
2721 * - decoding: Set by user.
2723 int thread_safe_callbacks;
2726 * The codec may call this to execute several independent things.
2727 * It will return only after finishing all tasks.
2728 * The user may replace this with some multithreaded implementation,
2729 * the default implementation will execute the parts serially.
2730 * @param count the number of things to execute
2731 * - encoding: Set by libavcodec, user can override.
2732 * - decoding: Set by libavcodec, user can override.
2734 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2737 * The codec may call this to execute several independent things.
2738 * It will return only after finishing all tasks.
2739 * The user may replace this with some multithreaded implementation,
2740 * the default implementation will execute the parts serially.
2741 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2742 * @param c context passed also to func
2743 * @param count the number of things to execute
2744 * @param arg2 argument passed unchanged to func
2745 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2746 * @param func function that will be called count times, with jobnr from 0 to count-1.
2747 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2748 * two instances of func executing at the same time will have the same threadnr.
2749 * @return always 0 currently, but code should handle a future improvement where when any call to func
2750 * returns < 0 no further calls to func may be done and < 0 is returned.
2751 * - encoding: Set by libavcodec, user can override.
2752 * - decoding: Set by libavcodec, user can override.
2754 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2756 #if FF_API_THREAD_OPAQUE
2758 * @deprecated this field should not be used from outside of lavc
2760 attribute_deprecated
2761 void *thread_opaque;
2765 * noise vs. sse weight for the nsse comparsion function
2766 * - encoding: Set by user.
2767 * - decoding: unused
2773 * - encoding: Set by user.
2774 * - decoding: Set by libavcodec.
2777 #define FF_PROFILE_UNKNOWN -99
2778 #define FF_PROFILE_RESERVED -100
2780 #define FF_PROFILE_AAC_MAIN 0
2781 #define FF_PROFILE_AAC_LOW 1
2782 #define FF_PROFILE_AAC_SSR 2
2783 #define FF_PROFILE_AAC_LTP 3
2784 #define FF_PROFILE_AAC_HE 4
2785 #define FF_PROFILE_AAC_HE_V2 28
2786 #define FF_PROFILE_AAC_LD 22
2787 #define FF_PROFILE_AAC_ELD 38
2788 #define FF_PROFILE_MPEG2_AAC_LOW 128
2789 #define FF_PROFILE_MPEG2_AAC_HE 131
2791 #define FF_PROFILE_DTS 20
2792 #define FF_PROFILE_DTS_ES 30
2793 #define FF_PROFILE_DTS_96_24 40
2794 #define FF_PROFILE_DTS_HD_HRA 50
2795 #define FF_PROFILE_DTS_HD_MA 60
2797 #define FF_PROFILE_MPEG2_422 0
2798 #define FF_PROFILE_MPEG2_HIGH 1
2799 #define FF_PROFILE_MPEG2_SS 2
2800 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2801 #define FF_PROFILE_MPEG2_MAIN 4
2802 #define FF_PROFILE_MPEG2_SIMPLE 5
2804 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2805 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2807 #define FF_PROFILE_H264_BASELINE 66
2808 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2809 #define FF_PROFILE_H264_MAIN 77
2810 #define FF_PROFILE_H264_EXTENDED 88
2811 #define FF_PROFILE_H264_HIGH 100
2812 #define FF_PROFILE_H264_HIGH_10 110
2813 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2814 #define FF_PROFILE_H264_HIGH_422 122
2815 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2816 #define FF_PROFILE_H264_HIGH_444 144
2817 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2818 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2819 #define FF_PROFILE_H264_CAVLC_444 44
2821 #define FF_PROFILE_VC1_SIMPLE 0
2822 #define FF_PROFILE_VC1_MAIN 1
2823 #define FF_PROFILE_VC1_COMPLEX 2
2824 #define FF_PROFILE_VC1_ADVANCED 3
2826 #define FF_PROFILE_MPEG4_SIMPLE 0
2827 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2828 #define FF_PROFILE_MPEG4_CORE 2
2829 #define FF_PROFILE_MPEG4_MAIN 3
2830 #define FF_PROFILE_MPEG4_N_BIT 4
2831 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2832 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2833 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2834 #define FF_PROFILE_MPEG4_HYBRID 8
2835 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2836 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2837 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2838 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2839 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2840 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2841 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2843 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2844 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2845 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2846 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2847 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2850 #define FF_PROFILE_HEVC_MAIN 1
2851 #define FF_PROFILE_HEVC_MAIN_10 2
2852 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2856 * - encoding: Set by user.
2857 * - decoding: Set by libavcodec.
2860 #define FF_LEVEL_UNKNOWN -99
2863 * Skip loop filtering for selected frames.
2864 * - encoding: unused
2865 * - decoding: Set by user.
2867 enum AVDiscard skip_loop_filter;
2870 * Skip IDCT/dequantization for selected frames.
2871 * - encoding: unused
2872 * - decoding: Set by user.
2874 enum AVDiscard skip_idct;
2877 * Skip decoding for selected frames.
2878 * - encoding: unused
2879 * - decoding: Set by user.
2881 enum AVDiscard skip_frame;
2884 * Header containing style information for text subtitles.
2885 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2886 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2887 * the Format line following. It shouldn't include any Dialogue line.
2888 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2889 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2891 uint8_t *subtitle_header;
2892 int subtitle_header_size;
2894 #if FF_API_ERROR_RATE
2896 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2899 attribute_deprecated
2903 #if FF_API_CODEC_PKT
2905 * @deprecated this field is not supposed to be accessed from outside lavc
2907 attribute_deprecated
2912 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2913 * Used for compliant TS muxing.
2914 * - encoding: Set by libavcodec.
2915 * - decoding: unused.
2920 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
2921 * Code outside libavcodec should access this field using:
2922 * av_codec_{get,set}_pkt_timebase(avctx)
2923 * - encoding unused.
2924 * - decoding set by user.
2926 AVRational pkt_timebase;
2930 * Code outside libavcodec should access this field using:
2931 * av_codec_{get,set}_codec_descriptor(avctx)
2932 * - encoding: unused.
2933 * - decoding: set by libavcodec.
2935 const AVCodecDescriptor *codec_descriptor;
2939 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2940 * - encoding: unused
2941 * - decoding: Set by user.
2942 * Code outside libavcodec should access this field using:
2943 * av_codec_{get,set}_lowres(avctx)
2949 * Current statistics for PTS correction.
2950 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2951 * - encoding: unused
2953 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2954 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2955 int64_t pts_correction_last_pts; /// PTS of the last frame
2956 int64_t pts_correction_last_dts; /// DTS of the last frame
2959 * Character encoding of the input subtitles file.
2960 * - decoding: set by user
2961 * - encoding: unused
2966 * Subtitles character encoding mode. Formats or codecs might be adjusting
2967 * this setting (if they are doing the conversion themselves for instance).
2968 * - decoding: set by libavcodec
2969 * - encoding: unused
2971 int sub_charenc_mode;
2972 #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)
2973 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
2974 #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
2977 * Skip processing alpha if supported by codec.
2978 * Note that if the format uses pre-multiplied alpha (common with VP6,
2979 * and recommended due to better video quality/compression)
2980 * the image will look as if alpha-blended onto a black background.
2981 * However for formats that do not use pre-multiplied alpha
2982 * there might be serious artefacts (though e.g. libswscale currently
2983 * assumes pre-multiplied alpha anyway).
2984 * Code outside libavcodec should access this field using AVOptions
2986 * - decoding: set by user
2987 * - encoding: unused
2992 * Number of samples to skip after a discontinuity
2993 * - decoding: unused
2994 * - encoding: set by libavcodec
2998 #if !FF_API_DEBUG_MV
3000 * debug motion vectors
3001 * Code outside libavcodec should access this field using AVOptions
3002 * - encoding: Set by user.
3003 * - decoding: Set by user.
3006 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3007 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3008 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3012 * custom intra quantization matrix
3013 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3014 * - encoding: Set by user, can be NULL.
3015 * - decoding: unused.
3017 uint16_t *chroma_intra_matrix;
3020 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3021 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3023 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3024 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3026 int av_codec_get_lowres(const AVCodecContext *avctx);
3027 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3029 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3030 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3032 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3033 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3038 typedef struct AVProfile {
3040 const char *name; ///< short name for the profile
3043 typedef struct AVCodecDefault AVCodecDefault;
3050 typedef struct AVCodec {
3052 * Name of the codec implementation.
3053 * The name is globally unique among encoders and among decoders (but an
3054 * encoder and a decoder can share the same name).
3055 * This is the primary way to find a codec from the user perspective.
3059 * Descriptive name for the codec, meant to be more human readable than name.
3060 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3062 const char *long_name;
3063 enum AVMediaType type;
3066 * Codec capabilities.
3070 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3071 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3072 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3073 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3074 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3076 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3078 const AVClass *priv_class; ///< AVClass for the private context
3079 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3081 /*****************************************************************
3082 * No fields below this line are part of the public API. They
3083 * may not be used outside of libavcodec and can be changed and
3085 * New public fields should be added right above.
3086 *****************************************************************
3089 struct AVCodec *next;
3091 * @name Frame-level threading support functions
3095 * If defined, called on thread contexts when they are created.
3096 * If the codec allocates writable tables in init(), re-allocate them here.
3097 * priv_data will be set to a copy of the original.
3099 int (*init_thread_copy)(AVCodecContext *);
3101 * Copy necessary context variables from a previous thread context to the current one.
3102 * If not defined, the next thread will start automatically; otherwise, the codec
3103 * must call ff_thread_finish_setup().
3105 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3107 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3111 * Private codec-specific defaults.
3113 const AVCodecDefault *defaults;
3116 * Initialize codec static data, called from avcodec_register().
3118 void (*init_static_data)(struct AVCodec *codec);
3120 int (*init)(AVCodecContext *);
3121 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3122 const struct AVSubtitle *sub);
3124 * Encode data to an AVPacket.
3126 * @param avctx codec context
3127 * @param avpkt output AVPacket (may contain a user-provided buffer)
3128 * @param[in] frame AVFrame containing the raw data to be encoded
3129 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3130 * non-empty packet was returned in avpkt.
3131 * @return 0 on success, negative error code on failure
3133 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3134 int *got_packet_ptr);
3135 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3136 int (*close)(AVCodecContext *);
3139 * Will be called when seeking
3141 void (*flush)(AVCodecContext *);
3144 int av_codec_get_max_lowres(const AVCodec *codec);
3146 struct MpegEncContext;
3151 typedef struct AVHWAccel {
3153 * Name of the hardware accelerated codec.
3154 * The name is globally unique among encoders and among decoders (but an
3155 * encoder and a decoder can share the same name).
3160 * Type of codec implemented by the hardware accelerator.
3162 * See AVMEDIA_TYPE_xxx
3164 enum AVMediaType type;
3167 * Codec implemented by the hardware accelerator.
3169 * See AV_CODEC_ID_xxx
3174 * Supported pixel format.
3176 * Only hardware accelerated formats are supported here.
3178 enum AVPixelFormat pix_fmt;
3181 * Hardware accelerated codec capabilities.
3182 * see FF_HWACCEL_CODEC_CAP_*
3186 struct AVHWAccel *next;
3189 * Called at the beginning of each frame or field picture.
3191 * Meaningful frame information (codec specific) is guaranteed to
3192 * be parsed at this point. This function is mandatory.
3194 * Note that buf can be NULL along with buf_size set to 0.
3195 * Otherwise, this means the whole frame is available at this point.
3197 * @param avctx the codec context
3198 * @param buf the frame data buffer base
3199 * @param buf_size the size of the frame in bytes
3200 * @return zero if successful, a negative value otherwise
3202 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3205 * Callback for each slice.
3207 * Meaningful slice information (codec specific) is guaranteed to
3208 * be parsed at this point. This function is mandatory.
3209 * The only exception is XvMC, that works on MB level.
3211 * @param avctx the codec context
3212 * @param buf the slice data buffer base
3213 * @param buf_size the size of the slice in bytes
3214 * @return zero if successful, a negative value otherwise
3216 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3219 * Called at the end of each frame or field picture.
3221 * The whole picture is parsed at this point and can now be sent
3222 * to the hardware accelerator. This function is mandatory.
3224 * @param avctx the codec context
3225 * @return zero if successful, a negative value otherwise
3227 int (*end_frame)(AVCodecContext *avctx);
3230 * Size of HW accelerator private data.
3232 * Private data is allocated with av_mallocz() before
3233 * AVCodecContext.get_buffer() and deallocated after
3234 * AVCodecContext.release_buffer().
3239 * Called for every Macroblock in a slice.
3241 * XvMC uses it to replace the ff_MPV_decode_mb().
3242 * Instead of decoding to raw picture, MB parameters are
3243 * stored in an array provided by the video driver.
3245 * @param s the mpeg context
3247 void (*decode_mb)(struct MpegEncContext *s);
3251 * @defgroup lavc_picture AVPicture
3253 * Functions for working with AVPicture
3258 * Picture data structure.
3260 * Up to four components can be stored into it, the last component is
3263 typedef struct AVPicture {
3264 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3265 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3272 enum AVSubtitleType {
3275 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3278 * Plain text, the text field must be set by the decoder and is
3279 * authoritative. ass and pict fields may contain approximations.
3284 * Formatted text, the ass field must be set by the decoder and is
3285 * authoritative. pict and text fields may contain approximations.
3290 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3292 typedef struct AVSubtitleRect {
3293 int x; ///< top left corner of pict, undefined when pict is not set
3294 int y; ///< top left corner of pict, undefined when pict is not set
3295 int w; ///< width of pict, undefined when pict is not set
3296 int h; ///< height of pict, undefined when pict is not set
3297 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3300 * data+linesize for the bitmap of this subtitle.
3301 * can be set for text/ass as well once they where rendered
3304 enum AVSubtitleType type;
3306 char *text; ///< 0 terminated plain UTF-8 text
3309 * 0 terminated ASS/SSA compatible event line.
3310 * The presentation of this is unaffected by the other values in this
3318 typedef struct AVSubtitle {
3319 uint16_t format; /* 0 = graphics */
3320 uint32_t start_display_time; /* relative to packet pts, in ms */
3321 uint32_t end_display_time; /* relative to packet pts, in ms */
3323 AVSubtitleRect **rects;
3324 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3328 * If c is NULL, returns the first registered codec,
3329 * if c is non-NULL, returns the next registered codec after c,
3330 * or NULL if c is the last one.
3332 AVCodec *av_codec_next(const AVCodec *c);
3335 * Return the LIBAVCODEC_VERSION_INT constant.
3337 unsigned avcodec_version(void);
3340 * Return the libavcodec build-time configuration.
3342 const char *avcodec_configuration(void);
3345 * Return the libavcodec license.
3347 const char *avcodec_license(void);
3350 * Register the codec codec and initialize libavcodec.
3352 * @warning either this function or avcodec_register_all() must be called
3353 * before any other libavcodec functions.
3355 * @see avcodec_register_all()
3357 void avcodec_register(AVCodec *codec);
3360 * Register all the codecs, parsers and bitstream filters which were enabled at
3361 * configuration time. If you do not call this function you can select exactly
3362 * which formats you want to support, by using the individual registration
3365 * @see avcodec_register
3366 * @see av_register_codec_parser
3367 * @see av_register_bitstream_filter
3369 void avcodec_register_all(void);
3372 * Allocate an AVCodecContext and set its fields to default values. The
3373 * resulting struct can be deallocated by calling avcodec_close() on it followed
3376 * @param codec if non-NULL, allocate private data and initialize defaults
3377 * for the given codec. It is illegal to then call avcodec_open2()
3378 * with a different codec.
3379 * If NULL, then the codec-specific defaults won't be initialized,
3380 * which may result in suboptimal default settings (this is
3381 * important mainly for encoders, e.g. libx264).
3383 * @return An AVCodecContext filled with default values or NULL on failure.
3384 * @see avcodec_get_context_defaults
3386 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3389 * Set the fields of the given AVCodecContext to default values corresponding
3390 * to the given codec (defaults may be codec-dependent).
3392 * Do not call this function if a non-NULL codec has been passed
3393 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3394 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3395 * different codec on this AVCodecContext.
3397 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3400 * Get the AVClass for AVCodecContext. It can be used in combination with
3401 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3403 * @see av_opt_find().
3405 const AVClass *avcodec_get_class(void);
3408 * Get the AVClass for AVFrame. It can be used in combination with
3409 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3411 * @see av_opt_find().
3413 const AVClass *avcodec_get_frame_class(void);
3416 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3417 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3419 * @see av_opt_find().
3421 const AVClass *avcodec_get_subtitle_rect_class(void);
3424 * Copy the settings of the source AVCodecContext into the destination
3425 * AVCodecContext. The resulting destination codec context will be
3426 * unopened, i.e. you are required to call avcodec_open2() before you
3427 * can use this AVCodecContext to decode/encode video/audio data.
3429 * @param dest target codec context, should be initialized with
3430 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3431 * @param src source codec context
3432 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3434 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3436 #if FF_API_AVFRAME_LAVC
3438 * @deprecated use av_frame_alloc()
3440 attribute_deprecated
3441 AVFrame *avcodec_alloc_frame(void);
3444 * Set the fields of the given AVFrame to default values.
3446 * @param frame The AVFrame of which the fields should be set to default values.
3448 * @deprecated use av_frame_unref()
3450 attribute_deprecated
3451 void avcodec_get_frame_defaults(AVFrame *frame);
3454 * Free the frame and any dynamically allocated objects in it,
3455 * e.g. extended_data.
3457 * @param frame frame to be freed. The pointer will be set to NULL.
3459 * @warning this function does NOT free the data buffers themselves
3460 * (it does not know how, since they might have been allocated with
3461 * a custom get_buffer()).
3463 * @deprecated use av_frame_free()
3465 attribute_deprecated
3466 void avcodec_free_frame(AVFrame **frame);
3470 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3471 * function the context has to be allocated with avcodec_alloc_context3().
3473 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3474 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3475 * retrieving a codec.
3477 * @warning This function is not thread safe!
3480 * avcodec_register_all();
3481 * av_dict_set(&opts, "b", "2.5M", 0);
3482 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3486 * context = avcodec_alloc_context3(codec);
3488 * if (avcodec_open2(context, codec, opts) < 0)
3492 * @param avctx The context to initialize.
3493 * @param codec The codec to open this context for. If a non-NULL codec has been
3494 * previously passed to avcodec_alloc_context3() or
3495 * avcodec_get_context_defaults3() for this context, then this
3496 * parameter MUST be either NULL or equal to the previously passed
3498 * @param options A dictionary filled with AVCodecContext and codec-private options.
3499 * On return this object will be filled with options that were not found.
3501 * @return zero on success, a negative value on error
3502 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3503 * av_dict_set(), av_opt_find().
3505 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3508 * Close a given AVCodecContext and free all the data associated with it
3509 * (but not the AVCodecContext itself).
3511 * Calling this function on an AVCodecContext that hasn't been opened will free
3512 * the codec-specific data allocated in avcodec_alloc_context3() /
3513 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3516 int avcodec_close(AVCodecContext *avctx);
3519 * Free all allocated data in the given subtitle struct.
3521 * @param sub AVSubtitle to free.
3523 void avsubtitle_free(AVSubtitle *sub);
3530 * @addtogroup lavc_packet
3534 #if FF_API_DESTRUCT_PACKET
3536 * Default packet destructor.
3537 * @deprecated use the AVBuffer API instead
3539 attribute_deprecated
3540 void av_destruct_packet(AVPacket *pkt);
3544 * Initialize optional fields of a packet with default values.
3546 * Note, this does not touch the data and size members, which have to be
3547 * initialized separately.
3551 void av_init_packet(AVPacket *pkt);
3554 * Allocate the payload of a packet and initialize its fields with
3558 * @param size wanted payload size
3559 * @return 0 if OK, AVERROR_xxx otherwise
3561 int av_new_packet(AVPacket *pkt, int size);
3564 * Reduce packet size, correctly zeroing padding
3567 * @param size new size
3569 void av_shrink_packet(AVPacket *pkt, int size);
3572 * Increase packet size, correctly zeroing padding
3575 * @param grow_by number of bytes by which to increase the size of the packet
3577 int av_grow_packet(AVPacket *pkt, int grow_by);
3580 * Initialize a reference-counted packet from av_malloc()ed data.
3582 * @param pkt packet to be initialized. This function will set the data, size,
3583 * buf and destruct fields, all others are left untouched.
3584 * @param data Data allocated by av_malloc() to be used as packet data. If this
3585 * function returns successfully, the data is owned by the underlying AVBuffer.
3586 * The caller may not access the data through other means.
3587 * @param size size of data in bytes, without the padding. I.e. the full buffer
3588 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3590 * @return 0 on success, a negative AVERROR on error
3592 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3595 * @warning This is a hack - the packet memory allocation stuff is broken. The
3596 * packet is allocated if it was not really allocated.
3598 int av_dup_packet(AVPacket *pkt);
3601 * Copy packet, including contents
3603 * @return 0 on success, negative AVERROR on fail
3605 int av_copy_packet(AVPacket *dst, const AVPacket *src);
3608 * Copy packet side data
3610 * @return 0 on success, negative AVERROR on fail
3612 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
3617 * @param pkt packet to free
3619 void av_free_packet(AVPacket *pkt);
3622 * Allocate new information of a packet.
3625 * @param type side information type
3626 * @param size side information size
3627 * @return pointer to fresh allocated data or NULL otherwise
3629 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3633 * Shrink the already allocated side data buffer
3636 * @param type side information type
3637 * @param size new side information size
3638 * @return 0 on success, < 0 on failure
3640 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3644 * Get side information from packet.
3647 * @param type desired side information type
3648 * @param size pointer for side information size to store (optional)
3649 * @return pointer to data if present or NULL otherwise
3651 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3654 int av_packet_merge_side_data(AVPacket *pkt);
3656 int av_packet_split_side_data(AVPacket *pkt);
3659 * Pack a dictionary for use in side_data.
3661 * @param dict The dictionary to pack.
3662 * @param size pointer to store the size of the returned data
3663 * @return pointer to data if successful, NULL otherwise
3665 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
3667 * Unpack a dictionary from side_data.
3669 * @param data data from side_data
3670 * @param size size of the data
3671 * @param dict the metadata storage dictionary
3672 * @return 0 on success, < 0 on failure
3674 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
3678 * Convenience function to free all the side data stored.
3679 * All the other fields stay untouched.
3683 void av_packet_free_side_data(AVPacket *pkt);
3686 * Setup a new reference to the data described by a given packet
3688 * If src is reference-counted, setup dst as a new reference to the
3689 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3690 * data from src into it.
3692 * All the other fields are copied from src.
3694 * @see av_packet_unref
3696 * @param dst Destination packet
3697 * @param src Source packet
3699 * @return 0 on success, a negative AVERROR on error.
3701 int av_packet_ref(AVPacket *dst, const AVPacket *src);
3706 * Unreference the buffer referenced by the packet and reset the
3707 * remaining packet fields to their default values.
3709 * @param pkt The packet to be unreferenced.
3711 void av_packet_unref(AVPacket *pkt);
3714 * Move every field in src to dst and reset src.
3716 * @see av_packet_unref
3718 * @param src Source packet, will be reset
3719 * @param dst Destination packet
3721 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3724 * Copy only "properties" fields from src to dst.
3726 * Properties for the purpose of this function are all the fields
3727 * beside those related to the packet data (buf, data, size)
3729 * @param dst Destination packet
3730 * @param src Source packet
3732 * @return 0 on success AVERROR on failure.
3735 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3742 * @addtogroup lavc_decoding
3747 * Find a registered decoder with a matching codec ID.
3749 * @param id AVCodecID of the requested decoder
3750 * @return A decoder if one was found, NULL otherwise.
3752 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3755 * Find a registered decoder with the specified name.
3757 * @param name name of the requested decoder
3758 * @return A decoder if one was found, NULL otherwise.
3760 AVCodec *avcodec_find_decoder_by_name(const char *name);
3762 #if FF_API_GET_BUFFER
3763 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3764 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3765 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3769 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3770 * it can be called by custom get_buffer2() implementations for decoders without
3771 * CODEC_CAP_DR1 set.
3773 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3777 * Return the amount of padding in pixels which the get_buffer callback must
3778 * provide around the edge of the image for codecs which do not have the
3779 * CODEC_FLAG_EMU_EDGE flag.
3781 * @return Required padding in pixels.
3783 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3786 attribute_deprecated
3787 unsigned avcodec_get_edge_width(void);
3791 * Modify width and height values so that they will result in a memory
3792 * buffer that is acceptable for the codec if you do not use any horizontal
3795 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3797 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3800 * Modify width and height values so that they will result in a memory
3801 * buffer that is acceptable for the codec if you also ensure that all
3802 * line sizes are a multiple of the respective linesize_align[i].
3804 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3806 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3807 int linesize_align[AV_NUM_DATA_POINTERS]);
3810 * Converts AVChromaLocation to swscale x/y chroma position.
3812 * The positions represent the chroma (0,0) position in a coordinates system
3813 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
3815 * @param xpos horizontal chroma sample position
3816 * @param ypos vertical chroma sample position
3818 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
3821 * Converts swscale x/y chroma position to AVChromaLocation.
3823 * The positions represent the chroma (0,0) position in a coordinates system
3824 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
3826 * @param xpos horizontal chroma sample position
3827 * @param ypos vertical chroma sample position
3829 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
3831 #if FF_API_OLD_DECODE_AUDIO
3833 * Wrapper function which calls avcodec_decode_audio4.
3835 * @deprecated Use avcodec_decode_audio4 instead.
3837 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3838 * Some decoders may support multiple frames in a single AVPacket, such
3839 * decoders would then just decode the first frame. In this case,
3840 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3841 * the remaining data in order to decode the second frame etc.
3843 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3844 * decompressed frame size in bytes.
3846 * @warning You must set frame_size_ptr to the allocated size of the
3847 * output buffer before calling avcodec_decode_audio3().
3849 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3850 * the actual read bytes because some optimized bitstream readers read 32 or 64
3851 * bits at once and could read over the end.
3853 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3854 * no overreading happens for damaged MPEG streams.
3856 * @warning You must not provide a custom get_buffer() when using
3857 * avcodec_decode_audio3(). Doing so will override it with
3858 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3859 * which does allow the application to provide a custom get_buffer().
3861 * @note You might have to align the input buffer avpkt->data and output buffer
3862 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3863 * necessary at all, on others it won't work at all if not aligned and on others
3864 * it will work but it will have an impact on performance.
3866 * In practice, avpkt->data should have 4 byte alignment at minimum and
3867 * samples should be 16 byte aligned unless the CPU doesn't need it
3868 * (AltiVec and SSE do).
3870 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3871 * between input and output, these need to be fed with avpkt->data=NULL,
3872 * avpkt->size=0 at the end to return the remaining frames.
3874 * @param avctx the codec context
3875 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3876 * If the sample format is planar, each channel plane will
3877 * be the same size, with no padding between channels.
3878 * @param[in,out] frame_size_ptr the output buffer size in bytes
3879 * @param[in] avpkt The input AVPacket containing the input buffer.
3880 * You can create such packet with av_init_packet() and by then setting
3881 * data and size, some decoders might in addition need other fields.
3882 * All decoders are designed to use the least fields possible though.
3883 * @return On error a negative value is returned, otherwise the number of bytes
3884 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3886 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3887 int *frame_size_ptr,
3892 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3894 * Some decoders may support multiple frames in a single AVPacket. Such
3895 * decoders would then just decode the first frame and the return value would be
3896 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3897 * called again with an AVPacket containing the remaining data in order to
3898 * decode the second frame, etc... Even if no frames are returned, the packet
3899 * needs to be fed to the decoder with remaining data until it is completely
3900 * consumed or an error occurs.
3902 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3903 * and output. This means that for some packets they will not immediately
3904 * produce decoded output and need to be flushed at the end of decoding to get
3905 * all the decoded data. Flushing is done by calling this function with packets
3906 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3907 * returning samples. It is safe to flush even those decoders that are not
3908 * marked with CODEC_CAP_DELAY, then no samples will be returned.
3910 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3911 * larger than the actual read bytes because some optimized bitstream
3912 * readers read 32 or 64 bits at once and could read over the end.
3914 * @param avctx the codec context
3915 * @param[out] frame The AVFrame in which to store decoded audio samples.
3916 * The decoder will allocate a buffer for the decoded frame by
3917 * calling the AVCodecContext.get_buffer2() callback.
3918 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3919 * reference counted and the returned reference belongs to the
3920 * caller. The caller must release the frame using av_frame_unref()
3921 * when the frame is no longer needed. The caller may safely write
3922 * to the frame if av_frame_is_writable() returns 1.
3923 * When AVCodecContext.refcounted_frames is set to 0, the returned
3924 * reference belongs to the decoder and is valid only until the
3925 * next call to this function or until closing or flushing the
3926 * decoder. The caller may not write to it.
3927 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3928 * non-zero. Note that this field being set to zero
3929 * does not mean that an error has occurred. For
3930 * decoders with CODEC_CAP_DELAY set, no given decode
3931 * call is guaranteed to produce a frame.
3932 * @param[in] avpkt The input AVPacket containing the input buffer.
3933 * At least avpkt->data and avpkt->size should be set. Some
3934 * decoders might also require additional fields to be set.
3935 * @return A negative error code is returned if an error occurred during
3936 * decoding, otherwise the number of bytes consumed from the input
3937 * AVPacket is returned.
3939 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3940 int *got_frame_ptr, const AVPacket *avpkt);
3943 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3944 * Some decoders may support multiple frames in a single AVPacket, such
3945 * decoders would then just decode the first frame.
3947 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3948 * the actual read bytes because some optimized bitstream readers read 32 or 64
3949 * bits at once and could read over the end.
3951 * @warning The end of the input buffer buf should be set to 0 to ensure that
3952 * no overreading happens for damaged MPEG streams.
3954 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3955 * between input and output, these need to be fed with avpkt->data=NULL,
3956 * avpkt->size=0 at the end to return the remaining frames.
3958 * @param avctx the codec context
3959 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3960 * Use av_frame_alloc() to get an AVFrame. The codec will
3961 * allocate memory for the actual bitmap by calling the
3962 * AVCodecContext.get_buffer2() callback.
3963 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3964 * reference counted and the returned reference belongs to the
3965 * caller. The caller must release the frame using av_frame_unref()
3966 * when the frame is no longer needed. The caller may safely write
3967 * to the frame if av_frame_is_writable() returns 1.
3968 * When AVCodecContext.refcounted_frames is set to 0, the returned
3969 * reference belongs to the decoder and is valid only until the
3970 * next call to this function or until closing or flushing the
3971 * decoder. The caller may not write to it.
3973 * @param[in] avpkt The input AVPacket containing the input buffer.
3974 * You can create such packet with av_init_packet() and by then setting
3975 * data and size, some decoders might in addition need other fields like
3976 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3978 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3979 * @return On error a negative value is returned, otherwise the number of bytes
3980 * used or zero if no frame could be decompressed.
3982 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3983 int *got_picture_ptr,
3984 const AVPacket *avpkt);
3987 * Decode a subtitle message.
3988 * Return a negative value on error, otherwise return the number of bytes used.
3989 * If no subtitle could be decompressed, got_sub_ptr is zero.
3990 * Otherwise, the subtitle is stored in *sub.
3991 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3992 * simplicity, because the performance difference is expect to be negligible
3993 * and reusing a get_buffer written for video codecs would probably perform badly
3994 * due to a potentially very different allocation pattern.
3996 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3997 * and output. This means that for some packets they will not immediately
3998 * produce decoded output and need to be flushed at the end of decoding to get
3999 * all the decoded data. Flushing is done by calling this function with packets
4000 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4001 * returning subtitles. It is safe to flush even those decoders that are not
4002 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4004 * @param avctx the codec context
4005 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4006 freed with avsubtitle_free if *got_sub_ptr is set.
4007 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4008 * @param[in] avpkt The input AVPacket containing the input buffer.
4010 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4015 * @defgroup lavc_parsing Frame parsing
4019 enum AVPictureStructure {
4020 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4021 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4022 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4023 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4026 typedef struct AVCodecParserContext {
4028 struct AVCodecParser *parser;
4029 int64_t frame_offset; /* offset of the current frame */
4030 int64_t cur_offset; /* current offset
4031 (incremented by each av_parser_parse()) */
4032 int64_t next_frame_offset; /* offset of the next frame */
4034 int pict_type; /* XXX: Put it back in AVCodecContext. */
4036 * This field is used for proper frame duration computation in lavf.
4037 * It signals, how much longer the frame duration of the current frame
4038 * is compared to normal frame duration.
4040 * frame_duration = (1 + repeat_pict) * time_base
4042 * It is used by codecs like H.264 to display telecined material.
4044 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4045 int64_t pts; /* pts of the current frame */
4046 int64_t dts; /* dts of the current frame */
4051 int fetch_timestamp;
4053 #define AV_PARSER_PTS_NB 4
4054 int cur_frame_start_index;
4055 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4056 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4057 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4060 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4061 #define PARSER_FLAG_ONCE 0x0002
4062 /// Set if the parser has a valid file offset
4063 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4064 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4066 int64_t offset; ///< byte offset from starting packet start
4067 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4070 * Set by parser to 1 for key frames and 0 for non-key frames.
4071 * It is initialized to -1, so if the parser doesn't set this flag,
4072 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4078 * Time difference in stream time base units from the pts of this
4079 * packet to the point at which the output from the decoder has converged
4080 * independent from the availability of previous frames. That is, the
4081 * frames are virtually identical no matter if decoding started from
4082 * the very first frame or from this keyframe.
4083 * Is AV_NOPTS_VALUE if unknown.
4084 * This field is not the display duration of the current frame.
4085 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4088 * The purpose of this field is to allow seeking in streams that have no
4089 * keyframes in the conventional sense. It corresponds to the
4090 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4091 * essential for some types of subtitle streams to ensure that all
4092 * subtitles are correctly displayed after seeking.
4094 int64_t convergence_duration;
4096 // Timestamp generation support:
4098 * Synchronization point for start of timestamp generation.
4100 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4103 * For example, this corresponds to presence of H.264 buffering period
4109 * Offset of the current timestamp against last timestamp sync point in
4110 * units of AVCodecContext.time_base.
4112 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4113 * contain a valid timestamp offset.
4115 * Note that the timestamp of sync point has usually a nonzero
4116 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4117 * the next frame after timestamp sync point will be usually 1.
4119 * For example, this corresponds to H.264 cpb_removal_delay.
4121 int dts_ref_dts_delta;
4124 * Presentation delay of current frame in units of AVCodecContext.time_base.
4126 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4127 * contain valid non-negative timestamp delta (presentation time of a frame
4128 * must not lie in the past).
4130 * This delay represents the difference between decoding and presentation
4131 * time of the frame.
4133 * For example, this corresponds to H.264 dpb_output_delay.
4138 * Position of the packet in file.
4140 * Analogous to cur_frame_pts/dts
4142 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4145 * Byte position of currently parsed frame in stream.
4150 * Previous frame byte position.
4155 * Duration of the current frame.
4156 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4157 * For all other types, this is in units of AVCodecContext.time_base.
4161 enum AVFieldOrder field_order;
4164 * Indicate whether a picture is coded as a frame, top field or bottom field.
4166 * For example, H.264 field_pic_flag equal to 0 corresponds to
4167 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4168 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4169 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4171 enum AVPictureStructure picture_structure;
4174 * Picture number incremented in presentation or output order.
4175 * This field may be reinitialized at the first picture of a new sequence.
4177 * For example, this corresponds to H.264 PicOrderCnt.
4179 int output_picture_number;
4180 } AVCodecParserContext;
4182 typedef struct AVCodecParser {
4183 int codec_ids[5]; /* several codec IDs are permitted */
4185 int (*parser_init)(AVCodecParserContext *s);
4186 int (*parser_parse)(AVCodecParserContext *s,
4187 AVCodecContext *avctx,
4188 const uint8_t **poutbuf, int *poutbuf_size,
4189 const uint8_t *buf, int buf_size);
4190 void (*parser_close)(AVCodecParserContext *s);
4191 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4192 struct AVCodecParser *next;
4195 AVCodecParser *av_parser_next(AVCodecParser *c);
4197 void av_register_codec_parser(AVCodecParser *parser);
4198 AVCodecParserContext *av_parser_init(int codec_id);
4203 * @param s parser context.
4204 * @param avctx codec context.
4205 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4206 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4207 * @param buf input buffer.
4208 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4209 * @param pts input presentation timestamp.
4210 * @param dts input decoding timestamp.
4211 * @param pos input byte position in stream.
4212 * @return the number of bytes of the input bitstream used.
4217 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4224 * decode_frame(data, size);
4228 int av_parser_parse2(AVCodecParserContext *s,
4229 AVCodecContext *avctx,
4230 uint8_t **poutbuf, int *poutbuf_size,
4231 const uint8_t *buf, int buf_size,
4232 int64_t pts, int64_t dts,
4236 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4237 * @deprecated use AVBitStreamFilter
4239 int av_parser_change(AVCodecParserContext *s,
4240 AVCodecContext *avctx,
4241 uint8_t **poutbuf, int *poutbuf_size,
4242 const uint8_t *buf, int buf_size, int keyframe);
4243 void av_parser_close(AVCodecParserContext *s);
4251 * @addtogroup lavc_encoding
4256 * Find a registered encoder with a matching codec ID.
4258 * @param id AVCodecID of the requested encoder
4259 * @return An encoder if one was found, NULL otherwise.
4261 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4264 * Find a registered encoder with the specified name.
4266 * @param name name of the requested encoder
4267 * @return An encoder if one was found, NULL otherwise.
4269 AVCodec *avcodec_find_encoder_by_name(const char *name);
4271 #if FF_API_OLD_ENCODE_AUDIO
4273 * Encode an audio frame from samples into buf.
4275 * @deprecated Use avcodec_encode_audio2 instead.
4277 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4278 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4279 * will know how much space is needed because it depends on the value passed
4280 * in buf_size as described below. In that case a lower value can be used.
4282 * @param avctx the codec context
4283 * @param[out] buf the output buffer
4284 * @param[in] buf_size the output buffer size
4285 * @param[in] samples the input buffer containing the samples
4286 * The number of samples read from this buffer is frame_size*channels,
4287 * both of which are defined in avctx.
4288 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4289 * samples read from samples is equal to:
4290 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4291 * This also implies that av_get_bits_per_sample() must not return 0 for these
4293 * @return On error a negative value is returned, on success zero or the number
4294 * of bytes used to encode the data read from the input buffer.
4296 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4297 uint8_t *buf, int buf_size,
4298 const short *samples);
4302 * Encode a frame of audio.
4304 * Takes input samples from frame and writes the next output packet, if
4305 * available, to avpkt. The output packet does not necessarily contain data for
4306 * the most recent frame, as encoders can delay, split, and combine input frames
4307 * internally as needed.
4309 * @param avctx codec context
4310 * @param avpkt output AVPacket.
4311 * The user can supply an output buffer by setting
4312 * avpkt->data and avpkt->size prior to calling the
4313 * function, but if the size of the user-provided data is not
4314 * large enough, encoding will fail. If avpkt->data and
4315 * avpkt->size are set, avpkt->destruct must also be set. All
4316 * other AVPacket fields will be reset by the encoder using
4317 * av_init_packet(). If avpkt->data is NULL, the encoder will
4318 * allocate it. The encoder will set avpkt->size to the size
4319 * of the output packet.
4321 * If this function fails or produces no output, avpkt will be
4322 * freed using av_free_packet() (i.e. avpkt->destruct will be
4323 * called to free the user supplied buffer).
4324 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4325 * May be NULL when flushing an encoder that has the
4326 * CODEC_CAP_DELAY capability set.
4327 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4328 * can have any number of samples.
4329 * If it is not set, frame->nb_samples must be equal to
4330 * avctx->frame_size for all frames except the last.
4331 * The final frame may be smaller than avctx->frame_size.
4332 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4333 * output packet is non-empty, and to 0 if it is
4334 * empty. If the function returns an error, the
4335 * packet can be assumed to be invalid, and the
4336 * value of got_packet_ptr is undefined and should
4338 * @return 0 on success, negative error code on failure
4340 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4341 const AVFrame *frame, int *got_packet_ptr);
4343 #if FF_API_OLD_ENCODE_VIDEO
4345 * @deprecated use avcodec_encode_video2() instead.
4347 * Encode a video frame from pict into buf.
4348 * The input picture should be
4349 * stored using a specific format, namely avctx.pix_fmt.
4351 * @param avctx the codec context
4352 * @param[out] buf the output buffer for the bitstream of encoded frame
4353 * @param[in] buf_size the size of the output buffer in bytes
4354 * @param[in] pict the input picture to encode
4355 * @return On error a negative value is returned, on success zero or the number
4356 * of bytes used from the output buffer.
4358 attribute_deprecated
4359 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4360 const AVFrame *pict);
4364 * Encode a frame of video.
4366 * Takes input raw video data from frame and writes the next output packet, if
4367 * available, to avpkt. The output packet does not necessarily contain data for
4368 * the most recent frame, as encoders can delay and reorder input frames
4369 * internally as needed.
4371 * @param avctx codec context
4372 * @param avpkt output AVPacket.
4373 * The user can supply an output buffer by setting
4374 * avpkt->data and avpkt->size prior to calling the
4375 * function, but if the size of the user-provided data is not
4376 * large enough, encoding will fail. All other AVPacket fields
4377 * will be reset by the encoder using av_init_packet(). If
4378 * avpkt->data is NULL, the encoder will allocate it.
4379 * The encoder will set avpkt->size to the size of the
4380 * output packet. The returned data (if any) belongs to the
4381 * caller, he is responsible for freeing it.
4383 * If this function fails or produces no output, avpkt will be
4384 * freed using av_free_packet() (i.e. avpkt->destruct will be
4385 * called to free the user supplied buffer).
4386 * @param[in] frame AVFrame containing the raw video data to be encoded.
4387 * May be NULL when flushing an encoder that has the
4388 * CODEC_CAP_DELAY capability set.
4389 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4390 * output packet is non-empty, and to 0 if it is
4391 * empty. If the function returns an error, the
4392 * packet can be assumed to be invalid, and the
4393 * value of got_packet_ptr is undefined and should
4395 * @return 0 on success, negative error code on failure
4397 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4398 const AVFrame *frame, int *got_packet_ptr);
4400 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4401 const AVSubtitle *sub);
4408 #if FF_API_AVCODEC_RESAMPLE
4410 * @defgroup lavc_resample Audio resampling
4412 * @deprecated use libswresample instead
4416 struct ReSampleContext;
4417 struct AVResampleContext;
4419 typedef struct ReSampleContext ReSampleContext;
4422 * Initialize audio resampling context.
4424 * @param output_channels number of output channels
4425 * @param input_channels number of input channels
4426 * @param output_rate output sample rate
4427 * @param input_rate input sample rate
4428 * @param sample_fmt_out requested output sample format
4429 * @param sample_fmt_in input sample format
4430 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4431 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4432 * @param linear if 1 then the used FIR filter will be linearly interpolated
4433 between the 2 closest, if 0 the closest will be used
4434 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4435 * @return allocated ReSampleContext, NULL if error occurred
4437 attribute_deprecated
4438 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4439 int output_rate, int input_rate,
4440 enum AVSampleFormat sample_fmt_out,
4441 enum AVSampleFormat sample_fmt_in,
4442 int filter_length, int log2_phase_count,
4443 int linear, double cutoff);
4445 attribute_deprecated
4446 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4449 * Free resample context.
4451 * @param s a non-NULL pointer to a resample context previously
4452 * created with av_audio_resample_init()
4454 attribute_deprecated
4455 void audio_resample_close(ReSampleContext *s);
4459 * Initialize an audio resampler.
4460 * Note, if either rate is not an integer then simply scale both rates up so they are.
4461 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4462 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4463 * @param linear If 1 then the used FIR filter will be linearly interpolated
4464 between the 2 closest, if 0 the closest will be used
4465 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4467 attribute_deprecated
4468 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4471 * Resample an array of samples using a previously configured context.
4472 * @param src an array of unconsumed samples
4473 * @param consumed the number of samples of src which have been consumed are returned here
4474 * @param src_size the number of unconsumed samples available
4475 * @param dst_size the amount of space in samples available in dst
4476 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
4477 * @return the number of samples written in dst or -1 if an error occurred
4479 attribute_deprecated
4480 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4484 * Compensate samplerate/timestamp drift. The compensation is done by changing
4485 * the resampler parameters, so no audible clicks or similar distortions occur
4486 * @param compensation_distance distance in output samples over which the compensation should be performed
4487 * @param sample_delta number of output samples which should be output less
4489 * example: av_resample_compensate(c, 10, 500)
4490 * here instead of 510 samples only 500 samples would be output
4492 * note, due to rounding the actual compensation might be slightly different,
4493 * especially if the compensation_distance is large and the in_rate used during init is small
4495 attribute_deprecated
4496 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4497 attribute_deprecated
4498 void av_resample_close(struct AVResampleContext *c);
4506 * @addtogroup lavc_picture
4511 * Allocate memory for the pixels of a picture and setup the AVPicture
4514 * Call avpicture_free() to free it.
4516 * @param picture the picture structure to be filled in
4517 * @param pix_fmt the pixel format of the picture
4518 * @param width the width of the picture
4519 * @param height the height of the picture
4520 * @return zero if successful, a negative error code otherwise
4522 * @see av_image_alloc(), avpicture_fill()
4524 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4527 * Free a picture previously allocated by avpicture_alloc().
4528 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4531 * @param picture the AVPicture to be freed
4533 void avpicture_free(AVPicture *picture);
4536 * Setup the picture fields based on the specified image parameters
4537 * and the provided image data buffer.
4539 * The picture fields are filled in by using the image data buffer
4540 * pointed to by ptr.
4542 * If ptr is NULL, the function will fill only the picture linesize
4543 * array and return the required size for the image buffer.
4545 * To allocate an image buffer and fill the picture data in one call,
4546 * use avpicture_alloc().
4548 * @param picture the picture to be filled in
4549 * @param ptr buffer where the image data is stored, or NULL
4550 * @param pix_fmt the pixel format of the image
4551 * @param width the width of the image in pixels
4552 * @param height the height of the image in pixels
4553 * @return the size in bytes required for src, a negative error code
4554 * in case of failure
4556 * @see av_image_fill_arrays()
4558 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4559 enum AVPixelFormat pix_fmt, int width, int height);
4562 * Copy pixel data from an AVPicture into a buffer.
4564 * avpicture_get_size() can be used to compute the required size for
4565 * the buffer to fill.
4567 * @param src source picture with filled data
4568 * @param pix_fmt picture pixel format
4569 * @param width picture width
4570 * @param height picture height
4571 * @param dest destination buffer
4572 * @param dest_size destination buffer size in bytes
4573 * @return the number of bytes written to dest, or a negative value
4574 * (error code) on error, for example if the destination buffer is not
4577 * @see av_image_copy_to_buffer()
4579 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4580 int width, int height,
4581 unsigned char *dest, int dest_size);
4584 * Calculate the size in bytes that a picture of the given width and height
4585 * would occupy if stored in the given picture format.
4587 * @param pix_fmt picture pixel format
4588 * @param width picture width
4589 * @param height picture height
4590 * @return the computed picture buffer size or a negative error code
4593 * @see av_image_get_buffer_size().
4595 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4597 #if FF_API_DEINTERLACE
4599 * deinterlace - if not supported return -1
4601 * @deprecated - use yadif (in libavfilter) instead
4603 attribute_deprecated
4604 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4605 enum AVPixelFormat pix_fmt, int width, int height);
4608 * Copy image src to dst. Wraps av_image_copy().
4610 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4611 enum AVPixelFormat pix_fmt, int width, int height);
4614 * Crop image top and left side.
4616 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4617 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4622 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4623 int padtop, int padbottom, int padleft, int padright, int *color);
4630 * @defgroup lavc_misc Utility functions
4633 * Miscellaneous utility functions related to both encoding and decoding
4639 * @defgroup lavc_misc_pixfmt Pixel formats
4641 * Functions for working with pixel formats.
4646 * Utility function to access log2_chroma_w log2_chroma_h from
4647 * the pixel format AVPixFmtDescriptor.
4649 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4650 * for one that returns a failure code and continues in case of invalid
4653 * @param[in] pix_fmt the pixel format
4654 * @param[out] h_shift store log2_chroma_w
4655 * @param[out] v_shift store log2_chroma_h
4657 * @see av_pix_fmt_get_chroma_sub_sample
4660 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4663 * Return a value representing the fourCC code associated to the
4664 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4667 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4669 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4670 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4671 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4672 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4673 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4674 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4677 * Compute what kind of losses will occur when converting from one specific
4678 * pixel format to another.
4679 * When converting from one pixel format to another, information loss may occur.
4680 * For example, when converting from RGB24 to GRAY, the color information will
4681 * be lost. Similarly, other losses occur when converting from some formats to
4682 * other formats. These losses can involve loss of chroma, but also loss of
4683 * resolution, loss of color depth, loss due to the color space conversion, loss
4684 * of the alpha bits or loss due to color quantization.
4685 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4686 * which will occur when converting from one pixel format to another.
4688 * @param[in] dst_pix_fmt destination pixel format
4689 * @param[in] src_pix_fmt source pixel format
4690 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4691 * @return Combination of flags informing you what kind of losses will occur
4692 * (maximum loss for an invalid dst_pix_fmt).
4694 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4698 * Find the best pixel format to convert to given a certain source pixel
4699 * format. When converting from one pixel format to another, information loss
4700 * may occur. For example, when converting from RGB24 to GRAY, the color
4701 * information will be lost. Similarly, other losses occur when converting from
4702 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4703 * the given pixel formats should be used to suffer the least amount of loss.
4704 * The pixel formats from which it chooses one, are determined by the
4705 * pix_fmt_list parameter.
4708 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4709 * @param[in] src_pix_fmt source pixel format
4710 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4711 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4712 * @return The best pixel format to convert to or -1 if none was found.
4714 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4715 enum AVPixelFormat src_pix_fmt,
4716 int has_alpha, int *loss_ptr);
4719 * Find the best pixel format to convert to given a certain source pixel
4720 * format and a selection of two destination pixel formats. When converting from
4721 * one pixel format to another, information loss may occur. For example, when converting
4722 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
4723 * converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() selects which of
4724 * the given pixel formats should be used to suffer the least amount of loss.
4726 * If one of the destination formats is AV_PIX_FMT_NONE the other pixel format (if valid) will be
4730 * src_pix_fmt = AV_PIX_FMT_YUV420P;
4731 * dst_pix_fmt1= AV_PIX_FMT_RGB24;
4732 * dst_pix_fmt2= AV_PIX_FMT_GRAY8;
4733 * dst_pix_fmt3= AV_PIX_FMT_RGB8;
4734 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
4735 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
4736 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
4739 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
4740 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
4741 * @param[in] src_pix_fmt Source pixel format
4742 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4743 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
4744 * NULL or value of zero means we care about all losses. Out: the loss
4745 * that occurs when converting from src to selected dst pixel format.
4746 * @return The best pixel format to convert to or -1 if none was found.
4748 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4749 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4751 attribute_deprecated
4752 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4753 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4754 enum AVPixelFormat src_pix_fmt,
4755 int has_alpha, int *loss_ptr);
4757 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4758 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4762 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4768 #if FF_API_SET_DIMENSIONS
4770 * @deprecated this function is not supposed to be used from outside of lavc
4772 attribute_deprecated
4773 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4777 * Put a string representing the codec tag codec_tag in buf.
4779 * @param buf buffer to place codec tag in
4780 * @param buf_size size in bytes of buf
4781 * @param codec_tag codec tag to assign
4782 * @return the length of the string that would have been generated if
4783 * enough space had been available, excluding the trailing null
4785 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4787 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4790 * Return a name for the specified profile, if available.
4792 * @param codec the codec that is searched for the given profile
4793 * @param profile the profile value for which a name is requested
4794 * @return A name for the profile if found, NULL otherwise.
4796 const char *av_get_profile_name(const AVCodec *codec, int profile);
4798 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4799 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4800 //FIXME func typedef
4803 * Fill AVFrame audio data and linesize pointers.
4805 * The buffer buf must be a preallocated buffer with a size big enough
4806 * to contain the specified samples amount. The filled AVFrame data
4807 * pointers will point to this buffer.
4809 * AVFrame extended_data channel pointers are allocated if necessary for
4812 * @param frame the AVFrame
4813 * frame->nb_samples must be set prior to calling the
4814 * function. This function fills in frame->data,
4815 * frame->extended_data, frame->linesize[0].
4816 * @param nb_channels channel count
4817 * @param sample_fmt sample format
4818 * @param buf buffer to use for frame data
4819 * @param buf_size size of buffer
4820 * @param align plane size sample alignment (0 = default)
4821 * @return >=0 on success, negative error code on failure
4822 * @todo return the size in bytes required to store the samples in
4823 * case of success, at the next libavutil bump
4825 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4826 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4827 int buf_size, int align);
4830 * Reset the internal decoder state / flush internal buffers. Should be called
4831 * e.g. when seeking or when switching to a different stream.
4833 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4834 * this invalidates the frames previously returned from the decoder. When
4835 * refcounted frames are used, the decoder just releases any references it might
4836 * keep internally, but the caller's reference remains valid.
4838 void avcodec_flush_buffers(AVCodecContext *avctx);
4841 * Return codec bits per sample.
4843 * @param[in] codec_id the codec
4844 * @return Number of bits per sample or zero if unknown for the given codec.
4846 int av_get_bits_per_sample(enum AVCodecID codec_id);
4849 * Return the PCM codec associated with a sample format.
4850 * @param be endianness, 0 for little, 1 for big,
4851 * -1 (or anything else) for native
4852 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
4854 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4857 * Return codec bits per sample.
4858 * Only return non-zero if the bits per sample is exactly correct, not an
4861 * @param[in] codec_id the codec
4862 * @return Number of bits per sample or zero if unknown for the given codec.
4864 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4867 * Return audio frame duration.
4869 * @param avctx codec context
4870 * @param frame_bytes size of the frame, or 0 if unknown
4871 * @return frame duration, in samples, if known. 0 if not able to
4874 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4877 typedef struct AVBitStreamFilterContext {
4879 struct AVBitStreamFilter *filter;
4880 AVCodecParserContext *parser;
4881 struct AVBitStreamFilterContext *next;
4882 } AVBitStreamFilterContext;
4885 typedef struct AVBitStreamFilter {
4888 int (*filter)(AVBitStreamFilterContext *bsfc,
4889 AVCodecContext *avctx, const char *args,
4890 uint8_t **poutbuf, int *poutbuf_size,
4891 const uint8_t *buf, int buf_size, int keyframe);
4892 void (*close)(AVBitStreamFilterContext *bsfc);
4893 struct AVBitStreamFilter *next;
4894 } AVBitStreamFilter;
4897 * Register a bitstream filter.
4899 * The filter will be accessible to the application code through
4900 * av_bitstream_filter_next() or can be directly initialized with
4901 * av_bitstream_filter_init().
4903 * @see avcodec_register_all()
4905 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4908 * Create and initialize a bitstream filter context given a bitstream
4911 * The returned context must be freed with av_bitstream_filter_close().
4913 * @param name the name of the bitstream filter
4914 * @return a bitstream filter context if a matching filter was found
4915 * and successfully initialized, NULL otherwise
4917 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4922 * This function filters the buffer buf with size buf_size, and places the
4923 * filtered buffer in the buffer pointed to by poutbuf.
4925 * The output buffer must be freed by the caller.
4927 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
4928 * @param avctx AVCodecContext accessed by the filter, may be NULL.
4929 * If specified, this must point to the encoder context of the
4930 * output stream the packet is sent to.
4931 * @param args arguments which specify the filter configuration, may be NULL
4932 * @param poutbuf pointer which is updated to point to the filtered buffer
4933 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
4934 * @param buf buffer containing the data to filter
4935 * @param buf_size size in bytes of buf
4936 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
4937 * @return >= 0 in case of success, or a negative error code in case of failure
4939 * If the return value is positive, an output buffer is allocated and
4940 * is availble in *poutbuf, and is distinct from the input buffer.
4942 * If the return value is 0, the output buffer is not allocated and
4943 * should be considered identical to the input buffer, or in case
4944 * *poutbuf was set it points to the input buffer (not necessarily to
4945 * its starting address).
4947 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4948 AVCodecContext *avctx, const char *args,
4949 uint8_t **poutbuf, int *poutbuf_size,
4950 const uint8_t *buf, int buf_size, int keyframe);
4953 * Release bitstream filter context.
4955 * @param bsf the bitstream filter context created with
4956 * av_bitstream_filter_init(), can be NULL
4958 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4961 * If f is NULL, return the first registered bitstream filter,
4962 * if f is non-NULL, return the next registered bitstream filter
4963 * after f, or NULL if f is the last one.
4965 * This function can be used to iterate over all registered bitstream
4968 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4973 * Same behaviour av_fast_malloc but the buffer has additional
4974 * FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
4976 * In addition the whole buffer will initially and after resizes
4977 * be 0-initialized so that no uninitialized data will ever appear.
4979 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4982 * Same behaviour av_fast_padded_malloc except that buffer will always
4983 * be 0-initialized after call.
4985 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
4988 * Encode extradata length to a buffer. Used by xiph codecs.
4990 * @param s buffer to write to; must be at least (v/255+1) bytes long
4991 * @param v size of extradata in bytes
4992 * @return number of bytes written to the buffer.
4994 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4996 #if FF_API_MISSING_SAMPLE
4998 * Log a generic warning message about a missing feature. This function is
4999 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5000 * only, and would normally not be used by applications.
5001 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5002 * a pointer to an AVClass struct
5003 * @param[in] feature string containing the name of the missing feature
5004 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5005 * If want_sample is non-zero, additional verbage will be added to the log
5006 * message which tells the user how to report samples to the development
5008 * @deprecated Use avpriv_report_missing_feature() instead.
5010 attribute_deprecated
5011 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5014 * Log a generic warning message asking for a sample. This function is
5015 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5016 * only, and would normally not be used by applications.
5017 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5018 * a pointer to an AVClass struct
5019 * @param[in] msg string containing an optional message, or NULL if no message
5020 * @deprecated Use avpriv_request_sample() instead.
5022 attribute_deprecated
5023 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5024 #endif /* FF_API_MISSING_SAMPLE */
5027 * Register the hardware accelerator hwaccel.
5029 void av_register_hwaccel(AVHWAccel *hwaccel);
5032 * If hwaccel is NULL, returns the first registered hardware accelerator,
5033 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5034 * after hwaccel, or NULL if hwaccel is the last one.
5036 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
5040 * Lock operation used by lockmgr
5043 AV_LOCK_CREATE, ///< Create a mutex
5044 AV_LOCK_OBTAIN, ///< Lock the mutex
5045 AV_LOCK_RELEASE, ///< Unlock the mutex
5046 AV_LOCK_DESTROY, ///< Free mutex resources
5050 * Register a user provided lock manager supporting the operations
5051 * specified by AVLockOp. mutex points to a (void *) where the
5052 * lockmgr should store/get a pointer to a user allocated mutex. It's
5053 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
5055 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
5056 * callback during the call to av_lockmgr_register().
5057 * Thus, the application must be prepared to handle that.
5058 * If cb is set to NULL the lockmgr will be unregistered.
5059 * Also note that during unregistration the previously registered
5060 * lockmgr callback may also be invoked.
5062 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5065 * Get the type of the given codec.
5067 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5070 * Get the name of a codec.
5071 * @return a static string identifying the codec; never NULL
5073 const char *avcodec_get_name(enum AVCodecID id);
5076 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5077 * with no corresponding avcodec_close()), 0 otherwise.
5079 int avcodec_is_open(AVCodecContext *s);
5082 * @return a non-zero number if codec is an encoder, zero otherwise
5084 int av_codec_is_encoder(const AVCodec *codec);
5087 * @return a non-zero number if codec is a decoder, zero otherwise
5089 int av_codec_is_decoder(const AVCodec *codec);
5092 * @return descriptor for given codec ID or NULL if no descriptor exists.
5094 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5097 * Iterate over all codec descriptors known to libavcodec.
5099 * @param prev previous descriptor. NULL to get the first descriptor.
5101 * @return next descriptor or NULL after the last descriptor
5103 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5106 * @return codec descriptor with the given name or NULL if no such descriptor
5109 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5115 #endif /* AVCODEC_AVCODEC_H */