2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/log.h"
40 #include "libavutil/pixfmt.h"
41 #include "libavutil/rational.h"
46 * @defgroup libavc Encoding/Decoding Library
49 * @defgroup lavc_decoding Decoding
53 * @defgroup lavc_encoding Encoding
57 * @defgroup lavc_codec Codecs
59 * @defgroup lavc_codec_native Native Codecs
62 * @defgroup lavc_codec_wrappers External library wrappers
65 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
69 * @defgroup lavc_internal Internal
77 * @defgroup lavc_core Core functions/structures.
80 * Basic definitions, functions for querying libavcodec capabilities,
81 * allocating core structures, etc.
87 * Identify the syntax and semantics of the bitstream.
88 * The principle is roughly:
89 * Two decoders with the same ID can decode the same streams.
90 * Two encoders with the same ID can encode compatible streams.
91 * There may be slight deviations from the principle due to implementation
94 * If you add a codec ID to this list, add it so that
95 * 1. no value of a existing codec ID changes (that would break ABI),
96 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
97 * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts.
99 * After adding new codec IDs, do not forget to add an entry to the codec
100 * descriptor list and bump libavcodec minor version.
106 AV_CODEC_ID_MPEG1VIDEO,
107 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
109 AV_CODEC_ID_MPEG2VIDEO_XVMC,
110 #endif /* FF_API_XVMC */
121 AV_CODEC_ID_RAWVIDEO,
122 AV_CODEC_ID_MSMPEG4V1,
123 AV_CODEC_ID_MSMPEG4V2,
124 AV_CODEC_ID_MSMPEG4V3,
147 AV_CODEC_ID_INTERPLAY_VIDEO,
154 AV_CODEC_ID_MSVIDEO1,
159 AV_CODEC_ID_TRUEMOTION1,
160 AV_CODEC_ID_VMDVIDEO,
185 AV_CODEC_ID_TRUEMOTION2,
191 AV_CODEC_ID_SMACKVIDEO,
196 AV_CODEC_ID_JPEG2000,
202 AV_CODEC_ID_DSICINVIDEO,
203 AV_CODEC_ID_TIERTEXSEQVIDEO,
211 AV_CODEC_ID_BETHSOFTVID,
223 AV_CODEC_ID_ESCAPE124,
227 AV_CODEC_ID_MOTIONPIXELS,
239 AV_CODEC_ID_FLASHSV2,
240 AV_CODEC_ID_CDGRAPHICS,
243 AV_CODEC_ID_BINKVIDEO,
244 AV_CODEC_ID_IFF_ILBM,
245 AV_CODEC_ID_IFF_BYTERUN1,
251 AV_CODEC_ID_A64_MULTI,
252 AV_CODEC_ID_A64_MULTI5,
255 AV_CODEC_ID_LAGARITH,
259 AV_CODEC_ID_WMV3IMAGE,
260 AV_CODEC_ID_VC1IMAGE,
262 AV_CODEC_ID_BMV_VIDEO,
269 AV_CODEC_ID_ZEROCODEC,
278 AV_CODEC_ID_ESCAPE130_DEPRECATED,
279 AV_CODEC_ID_G2M_DEPRECATED,
280 AV_CODEC_ID_WEBP_DEPRECATED,
281 AV_CODEC_ID_HNM4_VIDEO,
282 AV_CODEC_ID_HEVC_DEPRECATED,
284 AV_CODEC_ID_ALIAS_PIX,
285 AV_CODEC_ID_BRENDER_PIX_DEPRECATED,
286 AV_CODEC_ID_PAF_VIDEO_DEPRECATED,
287 AV_CODEC_ID_EXR_DEPRECATED,
288 AV_CODEC_ID_VP7_DEPRECATED,
289 AV_CODEC_ID_SANM_DEPRECATED,
290 AV_CODEC_ID_SGIRLE_DEPRECATED,
291 AV_CODEC_ID_MVC1_DEPRECATED,
292 AV_CODEC_ID_MVC2_DEPRECATED,
299 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
300 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
301 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
302 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
303 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
305 AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
306 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
307 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
308 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
309 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
310 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
311 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
312 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
313 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
314 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
315 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
316 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
317 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
318 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
319 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
320 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
321 AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'),
322 AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'),
323 AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'),
324 AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'),
325 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
326 AV_CODEC_ID_VP7 = MKBETAG('V','P','7','0'),
327 AV_CODEC_ID_APNG = MKBETAG('A','P','N','G'),
329 /* various PCM "codecs" */
330 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
331 AV_CODEC_ID_PCM_S16LE = 0x10000,
332 AV_CODEC_ID_PCM_S16BE,
333 AV_CODEC_ID_PCM_U16LE,
334 AV_CODEC_ID_PCM_U16BE,
337 AV_CODEC_ID_PCM_MULAW,
338 AV_CODEC_ID_PCM_ALAW,
339 AV_CODEC_ID_PCM_S32LE,
340 AV_CODEC_ID_PCM_S32BE,
341 AV_CODEC_ID_PCM_U32LE,
342 AV_CODEC_ID_PCM_U32BE,
343 AV_CODEC_ID_PCM_S24LE,
344 AV_CODEC_ID_PCM_S24BE,
345 AV_CODEC_ID_PCM_U24LE,
346 AV_CODEC_ID_PCM_U24BE,
347 AV_CODEC_ID_PCM_S24DAUD,
348 AV_CODEC_ID_PCM_ZORK,
349 AV_CODEC_ID_PCM_S16LE_PLANAR,
351 AV_CODEC_ID_PCM_F32BE,
352 AV_CODEC_ID_PCM_F32LE,
353 AV_CODEC_ID_PCM_F64BE,
354 AV_CODEC_ID_PCM_F64LE,
355 AV_CODEC_ID_PCM_BLURAY,
358 AV_CODEC_ID_PCM_S8_PLANAR,
359 AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED,
360 AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED,
361 AV_CODEC_ID_PCM_S16BE_PLANAR_DEPRECATED,
362 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
363 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
364 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
366 /* various ADPCM codecs */
367 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
368 AV_CODEC_ID_ADPCM_IMA_WAV,
369 AV_CODEC_ID_ADPCM_IMA_DK3,
370 AV_CODEC_ID_ADPCM_IMA_DK4,
371 AV_CODEC_ID_ADPCM_IMA_WS,
372 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
373 AV_CODEC_ID_ADPCM_MS,
374 AV_CODEC_ID_ADPCM_4XM,
375 AV_CODEC_ID_ADPCM_XA,
376 AV_CODEC_ID_ADPCM_ADX,
377 AV_CODEC_ID_ADPCM_EA,
378 AV_CODEC_ID_ADPCM_G726,
379 AV_CODEC_ID_ADPCM_CT,
380 AV_CODEC_ID_ADPCM_SWF,
381 AV_CODEC_ID_ADPCM_YAMAHA,
382 AV_CODEC_ID_ADPCM_SBPRO_4,
383 AV_CODEC_ID_ADPCM_SBPRO_3,
384 AV_CODEC_ID_ADPCM_SBPRO_2,
385 AV_CODEC_ID_ADPCM_THP,
386 AV_CODEC_ID_ADPCM_IMA_AMV,
387 AV_CODEC_ID_ADPCM_EA_R1,
388 AV_CODEC_ID_ADPCM_EA_R3,
389 AV_CODEC_ID_ADPCM_EA_R2,
390 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
391 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
392 AV_CODEC_ID_ADPCM_EA_XAS,
393 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
394 AV_CODEC_ID_ADPCM_IMA_ISS,
395 AV_CODEC_ID_ADPCM_G722,
396 AV_CODEC_ID_ADPCM_IMA_APC,
397 AV_CODEC_ID_ADPCM_VIMA_DEPRECATED,
398 AV_CODEC_ID_ADPCM_VIMA = MKBETAG('V','I','M','A'),
399 #if FF_API_VIMA_DECODER
400 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
402 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
403 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
404 AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '),
405 AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '),
406 AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'),
407 AV_CODEC_ID_ADPCM_THP_LE = MKBETAG('T','H','P','L'),
410 AV_CODEC_ID_AMR_NB = 0x12000,
413 /* RealAudio codecs*/
414 AV_CODEC_ID_RA_144 = 0x13000,
417 /* various DPCM codecs */
418 AV_CODEC_ID_ROQ_DPCM = 0x14000,
419 AV_CODEC_ID_INTERPLAY_DPCM,
420 AV_CODEC_ID_XAN_DPCM,
421 AV_CODEC_ID_SOL_DPCM,
424 AV_CODEC_ID_MP2 = 0x15000,
425 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
435 AV_CODEC_ID_VMDAUDIO,
441 AV_CODEC_ID_WESTWOOD_SND1,
442 AV_CODEC_ID_GSM, ///< as in Berlin toast format
445 AV_CODEC_ID_TRUESPEECH,
447 AV_CODEC_ID_SMACKAUDIO,
450 AV_CODEC_ID_DSICINAUDIO,
452 AV_CODEC_ID_MUSEPACK7,
454 AV_CODEC_ID_GSM_MS, /* as found in WAV */
460 AV_CODEC_ID_NELLYMOSER,
461 AV_CODEC_ID_MUSEPACK8,
463 AV_CODEC_ID_WMAVOICE,
465 AV_CODEC_ID_WMALOSSLESS,
474 AV_CODEC_ID_BINKAUDIO_RDFT,
475 AV_CODEC_ID_BINKAUDIO_DCT,
476 AV_CODEC_ID_AAC_LATM,
481 AV_CODEC_ID_8SVX_EXP,
482 AV_CODEC_ID_8SVX_FIB,
483 AV_CODEC_ID_BMV_AUDIO,
487 AV_CODEC_ID_OPUS_DEPRECATED,
488 AV_CODEC_ID_COMFORT_NOISE,
489 AV_CODEC_ID_TAK_DEPRECATED,
490 AV_CODEC_ID_METASOUND,
491 AV_CODEC_ID_PAF_AUDIO_DEPRECATED,
494 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
495 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
496 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
497 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
498 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
499 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
500 AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
501 AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
502 AV_CODEC_ID_DSD_LSBF = MKBETAG('D','S','D','L'),
503 AV_CODEC_ID_DSD_MSBF = MKBETAG('D','S','D','M'),
504 AV_CODEC_ID_DSD_LSBF_PLANAR = MKBETAG('D','S','D','1'),
505 AV_CODEC_ID_DSD_MSBF_PLANAR = MKBETAG('D','S','D','8'),
506 AV_CODEC_ID_4GV = MKBETAG('s','4','g','v'),
508 /* subtitle codecs */
509 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
510 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
511 AV_CODEC_ID_DVB_SUBTITLE,
512 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
515 AV_CODEC_ID_MOV_TEXT,
516 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
517 AV_CODEC_ID_DVB_TELETEXT,
519 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
520 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
521 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
522 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
523 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
524 AV_CODEC_ID_STL = MKBETAG('S','p','T','L'),
525 AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
526 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
527 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
528 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
529 AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
530 AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
531 AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
532 AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska
533 AV_CODEC_ID_HDMV_TEXT_SUBTITLE = MKBETAG('B','D','T','X'),
535 /* other specific kind of codecs (generally used for attachments) */
536 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
537 AV_CODEC_ID_TTF = 0x18000,
538 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
539 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
540 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
541 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
542 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
543 AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
544 AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'),
545 AV_CODEC_ID_BIN_DATA = MKBETAG('D','A','T','A'),
548 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
550 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
551 * stream (only used by libavformat) */
552 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
553 * stream (only used by libavformat) */
554 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
557 #include "old_codec_ids.h"
562 * This struct describes the properties of a single codec described by an
564 * @see avcodec_descriptor_get()
566 typedef struct AVCodecDescriptor {
568 enum AVMediaType type;
570 * Name of the codec described by this descriptor. It is non-empty and
571 * unique for each codec descriptor. It should contain alphanumeric
572 * characters and '_' only.
576 * A more descriptive name for this codec. May be NULL.
578 const char *long_name;
580 * Codec properties, a combination of AV_CODEC_PROP_* flags.
585 * MIME type(s) associated with the codec.
586 * May be NULL; if not, a NULL-terminated array of MIME types.
587 * The first item is always non-NULL and is the preferred MIME type.
589 const char *const *mime_types;
593 * Codec uses only intra compression.
596 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
598 * Codec supports lossy compression. Audio and video codecs only.
599 * @note a codec may support both lossy and lossless
602 #define AV_CODEC_PROP_LOSSY (1 << 1)
604 * Codec supports lossless compression. Audio and video codecs only.
606 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
608 * Codec supports frame reordering. That is, the coded order (the order in which
609 * the encoded packets are output by the encoders / stored / input to the
610 * decoders) may be different from the presentation order of the corresponding
613 * For codecs that do not have this property set, PTS and DTS should always be
616 #define AV_CODEC_PROP_REORDER (1 << 3)
618 * Subtitle codec is bitmap based
619 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
621 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
623 * Subtitle codec is text based.
624 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
626 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
629 * @ingroup lavc_decoding
630 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
631 * This is mainly needed because some optimized bitstream readers read
632 * 32 or 64 bit at once and could read over the end.<br>
633 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
634 * MPEG bitstreams could cause overread and segfault.
636 #define AV_INPUT_BUFFER_PADDING_SIZE 32
639 * @ingroup lavc_encoding
640 * minimum encoding buffer size
641 * Used to avoid some checks during header writing.
643 #define AV_INPUT_BUFFER_MIN_SIZE 16384
645 #if FF_API_WITHOUT_PREFIX
647 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
649 #define FF_INPUT_BUFFER_PADDING_SIZE 32
652 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
654 #define FF_MIN_BUFFER_SIZE 16384
655 #endif /* FF_API_WITHOUT_PREFIX */
658 * @ingroup lavc_encoding
659 * motion estimation type.
660 * @deprecated use codec private option instead
662 #if FF_API_MOTION_EST
664 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
668 ME_EPZS, ///< enhanced predictive zonal search
669 ME_X1, ///< reserved for experiments
670 ME_HEX, ///< hexagon based search
671 ME_UMH, ///< uneven multi-hexagon search
672 ME_TESA, ///< transformed exhaustive search algorithm
673 ME_ITER=50, ///< iterative search
678 * @ingroup lavc_decoding
681 /* We leave some space between them for extensions (drop some
682 * keyframes for intra-only or drop just some bidir frames). */
683 AVDISCARD_NONE =-16, ///< discard nothing
684 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
685 AVDISCARD_NONREF = 8, ///< discard all non reference
686 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
687 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
688 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
689 AVDISCARD_ALL = 48, ///< discard all
692 enum AVAudioServiceType {
693 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
694 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
695 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
696 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
697 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
698 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
699 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
700 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
701 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
702 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
706 * @ingroup lavc_encoding
708 typedef struct RcOverride{
711 int qscale; // If this is 0 then quality_factor will be used instead.
712 float quality_factor;
715 #if FF_API_MAX_BFRAMES
717 * @deprecated there is no libavcodec-wide limit on the number of B-frames
719 #define FF_MAX_B_FRAMES 16
723 These flags can be passed in AVCodecContext.flags before initialization.
724 Note: Not everything is supported yet.
728 * Allow decoders to produce frames with data planes that are not aligned
729 * to CPU requirements (e.g. due to cropping).
731 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
735 #define AV_CODEC_FLAG_QSCALE (1 << 1)
737 * 4 MV per MB allowed / advanced prediction for H.263.
739 #define AV_CODEC_FLAG_4MV (1 << 2)
741 * Output even those frames that might be corrupted.
743 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
747 #define AV_CODEC_FLAG_QPEL (1 << 4)
749 * Use internal 2pass ratecontrol in first pass mode.
751 #define AV_CODEC_FLAG_PASS1 (1 << 9)
753 * Use internal 2pass ratecontrol in second pass mode.
755 #define AV_CODEC_FLAG_PASS2 (1 << 10)
759 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
761 * Only decode/encode grayscale.
763 #define AV_CODEC_FLAG_GRAY (1 << 13)
765 * error[?] variables will be set during encoding.
767 #define AV_CODEC_FLAG_PSNR (1 << 15)
769 * Input bitstream might be truncated at a random location
770 * instead of only at frame boundaries.
772 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
774 * Use interlaced DCT.
776 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
780 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
782 * Place global headers in extradata instead of every keyframe.
784 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
786 * Use only bitexact stuff (except (I)DCT).
788 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
789 /* Fx : Flag for h263+ extra options */
791 * H.263 advanced intra coding / MPEG-4 AC prediction
793 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
795 * interlaced motion estimation
797 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
799 * Allow non spec compliant speedup tricks.
801 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
803 #define AV_CODEC_FLAG2_FAST (1 << 0)
805 * Skip bitstream encoding.
807 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
809 * Place global headers at every keyframe instead of in extradata.
811 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
814 * timecode is in drop frame format. DEPRECATED!!!!
816 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
819 * Input bitstream might be truncated at a packet boundaries
820 * instead of only at frame boundaries.
822 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
824 * Discard cropping information from SPS.
826 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
829 * Show all frames before the first keyframe
831 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
833 * Export motion vectors through frame side data
835 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
837 * Do not skip samples and export skip information as frame side data
839 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
841 /* Unsupported options :
842 * Syntax Arithmetic coding (SAC)
843 * Reference Picture Selection
844 * Independent Segment Decoding */
846 /* codec capabilities */
849 * Decoder can use draw_horiz_band callback.
851 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
853 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
854 * If not set, it might not use get_buffer() at all or use operations that
855 * assume the buffer was allocated by avcodec_default_get_buffer.
857 #define AV_CODEC_CAP_DR1 (1 << 1)
858 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
860 * Encoder or decoder requires flushing with NULL input at the end in order to
861 * give the complete and correct output.
863 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
864 * with NULL data. The user can still send NULL data to the public encode
865 * or decode function, but libavcodec will not pass it along to the codec
866 * unless this flag is set.
869 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
870 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
874 * The encoder needs to be fed with NULL data at the end of encoding until the
875 * encoder no longer returns data.
877 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
878 * flag also means that the encoder must set the pts and duration for
879 * each output packet. If this flag is not set, the pts and duration will
880 * be determined by libavcodec from the input frame.
882 #define AV_CODEC_CAP_DELAY (1 << 5)
884 * Codec can be fed a final frame with a smaller size.
885 * This can be used to prevent truncation of the last audio samples.
887 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
891 * Codec can export data for HW decoding (VDPAU).
893 #define AV_CODEC_CAP_HWACCEL_VDPAU (1 << 7)
897 * Codec can output multiple frames per AVPacket
898 * Normally demuxers return one frame at a time, demuxers which do not do
899 * are connected to a parser to split what they return into proper frames.
900 * This flag is reserved to the very rare category of codecs which have a
901 * bitstream that cannot be split into frames without timeconsuming
902 * operations like full decoding. Demuxers carring such bitstreams thus
903 * may return multiple frames in a packet. This has many disadvantages like
904 * prohibiting stream copy in many cases thus it should only be considered
907 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
909 * Codec is experimental and is thus avoided in favor of non experimental
912 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
914 * Codec should fill in channel configuration and samplerate instead of container
916 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
918 * Codec supports frame-level multithreading.
920 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
922 * Codec supports slice-based (or partition-based) multithreading.
924 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
926 * Codec supports changed parameters at any point.
928 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
930 * Codec supports avctx->thread_count == 0 (auto).
932 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
934 * Audio encoder supports receiving a different number of samples in each call.
936 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
938 * Codec is intra only.
940 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
944 #define AV_CODEC_CAP_LOSSLESS 0x80000000
947 #if FF_API_WITHOUT_PREFIX
949 * Allow decoders to produce frames with data planes that are not aligned
950 * to CPU requirements (e.g. due to cropping).
952 #define CODEC_FLAG_UNALIGNED AV_CODEC_FLAG_UNALIGNED
953 #define CODEC_FLAG_QSCALE AV_CODEC_FLAG_QSCALE
954 #define CODEC_FLAG_4MV AV_CODEC_FLAG_4MV
955 #define CODEC_FLAG_OUTPUT_CORRUPT AV_CODEC_FLAG_OUTPUT_CORRUPT
956 #define CODEC_FLAG_QPEL AV_CODEC_FLAG_QPEL
959 * @deprecated use the "gmc" private option of the libxvid encoder
961 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
965 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
968 #define CODEC_FLAG_MV0 0x0040
970 #if FF_API_INPUT_PRESERVED
972 * @deprecated passing reference-counted frames to the encoders replaces this
975 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
977 #define CODEC_FLAG_PASS1 AV_CODEC_FLAG_PASS1
978 #define CODEC_FLAG_PASS2 AV_CODEC_FLAG_PASS2
979 #define CODEC_FLAG_GRAY AV_CODEC_FLAG_GRAY
982 * @deprecated edges are not used/required anymore. I.e. this flag is now always
985 #define CODEC_FLAG_EMU_EDGE 0x4000
987 #define CODEC_FLAG_PSNR AV_CODEC_FLAG_PSNR
988 #define CODEC_FLAG_TRUNCATED AV_CODEC_FLAG_TRUNCATED
990 #if FF_API_NORMALIZE_AQP
992 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
995 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
997 #define CODEC_FLAG_INTERLACED_DCT AV_CODEC_FLAG_INTERLACED_DCT
998 #define CODEC_FLAG_LOW_DELAY AV_CODEC_FLAG_LOW_DELAY
999 #define CODEC_FLAG_GLOBAL_HEADER AV_CODEC_FLAG_GLOBAL_HEADER
1000 #define CODEC_FLAG_BITEXACT AV_CODEC_FLAG_BITEXACT
1001 #define CODEC_FLAG_AC_PRED AV_CODEC_FLAG_AC_PRED
1002 #define CODEC_FLAG_LOOP_FILTER AV_CODEC_FLAG_LOOP_FILTER
1003 #define CODEC_FLAG_INTERLACED_ME AV_CODEC_FLAG_INTERLACED_ME
1004 #define CODEC_FLAG_CLOSED_GOP AV_CODEC_FLAG_CLOSED_GOP
1005 #define CODEC_FLAG2_FAST AV_CODEC_FLAG2_FAST
1006 #define CODEC_FLAG2_NO_OUTPUT AV_CODEC_FLAG2_NO_OUTPUT
1007 #define CODEC_FLAG2_LOCAL_HEADER AV_CODEC_FLAG2_LOCAL_HEADER
1008 #define CODEC_FLAG2_DROP_FRAME_TIMECODE AV_CODEC_FLAG2_DROP_FRAME_TIMECODE
1009 #define CODEC_FLAG2_IGNORE_CROP AV_CODEC_FLAG2_IGNORE_CROP
1011 #define CODEC_FLAG2_CHUNKS AV_CODEC_FLAG2_CHUNKS
1012 #define CODEC_FLAG2_SHOW_ALL AV_CODEC_FLAG2_SHOW_ALL
1013 #define CODEC_FLAG2_EXPORT_MVS AV_CODEC_FLAG2_EXPORT_MVS
1014 #define CODEC_FLAG2_SKIP_MANUAL AV_CODEC_FLAG2_SKIP_MANUAL
1016 /* Unsupported options :
1017 * Syntax Arithmetic coding (SAC)
1018 * Reference Picture Selection
1019 * Independent Segment Decoding */
1021 /* codec capabilities */
1023 #define CODEC_CAP_DRAW_HORIZ_BAND AV_CODEC_CAP_DRAW_HORIZ_BAND ///< Decoder can use draw_horiz_band callback.
1025 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1026 * If not set, it might not use get_buffer() at all or use operations that
1027 * assume the buffer was allocated by avcodec_default_get_buffer.
1029 #define CODEC_CAP_DR1 AV_CODEC_CAP_DR1
1030 #define CODEC_CAP_TRUNCATED AV_CODEC_CAP_TRUNCATED
1032 /* Codec can export data for HW decoding. This flag indicates that
1033 * the codec would call get_format() with list that might contain HW accelerated
1034 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
1035 * including raw image format.
1036 * The application can use the passed context to determine bitstream version,
1037 * chroma format, resolution etc.
1039 #define CODEC_CAP_HWACCEL 0x0010
1040 #endif /* FF_API_XVMC */
1042 * Encoder or decoder requires flushing with NULL input at the end in order to
1043 * give the complete and correct output.
1045 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1046 * with NULL data. The user can still send NULL data to the public encode
1047 * or decode function, but libavcodec will not pass it along to the codec
1048 * unless this flag is set.
1051 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1052 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1056 * The encoder needs to be fed with NULL data at the end of encoding until the
1057 * encoder no longer returns data.
1059 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1060 * flag also means that the encoder must set the pts and duration for
1061 * each output packet. If this flag is not set, the pts and duration will
1062 * be determined by libavcodec from the input frame.
1064 #define CODEC_CAP_DELAY AV_CODEC_CAP_DELAY
1066 * Codec can be fed a final frame with a smaller size.
1067 * This can be used to prevent truncation of the last audio samples.
1069 #define CODEC_CAP_SMALL_LAST_FRAME AV_CODEC_CAP_SMALL_LAST_FRAME
1070 #if FF_API_CAP_VDPAU
1072 * Codec can export data for HW decoding (VDPAU).
1074 #define CODEC_CAP_HWACCEL_VDPAU AV_CODEC_CAP_HWACCEL_VDPAU
1077 * Codec can output multiple frames per AVPacket
1078 * Normally demuxers return one frame at a time, demuxers which do not do
1079 * are connected to a parser to split what they return into proper frames.
1080 * This flag is reserved to the very rare category of codecs which have a
1081 * bitstream that cannot be split into frames without timeconsuming
1082 * operations like full decoding. Demuxers carring such bitstreams thus
1083 * may return multiple frames in a packet. This has many disadvantages like
1084 * prohibiting stream copy in many cases thus it should only be considered
1087 #define CODEC_CAP_SUBFRAMES AV_CODEC_CAP_SUBFRAMES
1089 * Codec is experimental and is thus avoided in favor of non experimental
1092 #define CODEC_CAP_EXPERIMENTAL AV_CODEC_CAP_EXPERIMENTAL
1094 * Codec should fill in channel configuration and samplerate instead of container
1096 #define CODEC_CAP_CHANNEL_CONF AV_CODEC_CAP_CHANNEL_CONF
1097 #if FF_API_NEG_LINESIZES
1099 * @deprecated no codecs use this capability
1101 #define CODEC_CAP_NEG_LINESIZES 0x0800
1104 * Codec supports frame-level multithreading.
1106 #define CODEC_CAP_FRAME_THREADS AV_CODEC_CAP_FRAME_THREADS
1108 * Codec supports slice-based (or partition-based) multithreading.
1110 #define CODEC_CAP_SLICE_THREADS AV_CODEC_CAP_SLICE_THREADS
1112 * Codec supports changed parameters at any point.
1114 #define CODEC_CAP_PARAM_CHANGE AV_CODEC_CAP_PARAM_CHANGE
1116 * Codec supports avctx->thread_count == 0 (auto).
1118 #define CODEC_CAP_AUTO_THREADS AV_CODEC_CAP_AUTO_THREADS
1120 * Audio encoder supports receiving a different number of samples in each call.
1122 #define CODEC_CAP_VARIABLE_FRAME_SIZE AV_CODEC_CAP_VARIABLE_FRAME_SIZE
1124 * Codec is intra only.
1126 #define CODEC_CAP_INTRA_ONLY AV_CODEC_CAP_INTRA_ONLY
1128 * Codec is lossless.
1130 #define CODEC_CAP_LOSSLESS AV_CODEC_CAP_LOSSLESS
1133 * HWAccel is experimental and is thus avoided in favor of non experimental
1136 #define HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
1137 #endif /* FF_API_WITHOUT_PREFIX */
1140 //The following defines may change, don't expect compatibility if you use them.
1141 #define MB_TYPE_INTRA4x4 0x0001
1142 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1143 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1144 #define MB_TYPE_16x16 0x0008
1145 #define MB_TYPE_16x8 0x0010
1146 #define MB_TYPE_8x16 0x0020
1147 #define MB_TYPE_8x8 0x0040
1148 #define MB_TYPE_INTERLACED 0x0080
1149 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1150 #define MB_TYPE_ACPRED 0x0200
1151 #define MB_TYPE_GMC 0x0400
1152 #define MB_TYPE_SKIP 0x0800
1153 #define MB_TYPE_P0L0 0x1000
1154 #define MB_TYPE_P1L0 0x2000
1155 #define MB_TYPE_P0L1 0x4000
1156 #define MB_TYPE_P1L1 0x8000
1157 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1158 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1159 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1160 #define MB_TYPE_QUANT 0x00010000
1161 #define MB_TYPE_CBP 0x00020000
1162 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
1167 * This specifies the area which should be displayed.
1168 * Note there may be multiple such areas for one frame.
1170 typedef struct AVPanScan{
1173 * - encoding: Set by user.
1174 * - decoding: Set by libavcodec.
1179 * width and height in 1/16 pel
1180 * - encoding: Set by user.
1181 * - decoding: Set by libavcodec.
1187 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1188 * - encoding: Set by user.
1189 * - decoding: Set by libavcodec.
1191 int16_t position[3][2];
1194 #if FF_API_QSCALE_TYPE
1195 #define FF_QSCALE_TYPE_MPEG1 0
1196 #define FF_QSCALE_TYPE_MPEG2 1
1197 #define FF_QSCALE_TYPE_H264 2
1198 #define FF_QSCALE_TYPE_VP56 3
1201 #if FF_API_GET_BUFFER
1202 #define FF_BUFFER_TYPE_INTERNAL 1
1203 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1204 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1205 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1207 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1208 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1209 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1210 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1214 * The decoder will keep a reference to the frame and may reuse it later.
1216 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1219 * @defgroup lavc_packet AVPacket
1221 * Types and functions for working with AVPacket.
1224 enum AVPacketSideDataType {
1225 AV_PKT_DATA_PALETTE,
1226 AV_PKT_DATA_NEW_EXTRADATA,
1229 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1232 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1233 * s32le channel_count
1234 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1235 * u64le channel_layout
1236 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1238 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1243 AV_PKT_DATA_PARAM_CHANGE,
1246 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1247 * structures with info about macroblocks relevant to splitting the
1248 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1249 * That is, it does not necessarily contain info about all macroblocks,
1250 * as long as the distance between macroblocks in the info is smaller
1251 * than the target payload size.
1252 * Each MB info structure is 12 bytes, and is laid out as follows:
1254 * u32le bit offset from the start of the packet
1255 * u8 current quantizer at the start of the macroblock
1257 * u16le macroblock address within the GOB
1258 * u8 horizontal MV predictor
1259 * u8 vertical MV predictor
1260 * u8 horizontal MV predictor for block number 3
1261 * u8 vertical MV predictor for block number 3
1264 AV_PKT_DATA_H263_MB_INFO,
1267 * This side data should be associated with an audio stream and contains
1268 * ReplayGain information in form of the AVReplayGain struct.
1270 AV_PKT_DATA_REPLAYGAIN,
1273 * This side data contains a 3x3 transformation matrix describing an affine
1274 * transformation that needs to be applied to the decoded video frames for
1275 * correct presentation.
1277 * See libavutil/display.h for a detailed description of the data.
1279 AV_PKT_DATA_DISPLAYMATRIX,
1282 * This side data should be associated with a video stream and contains
1283 * Stereoscopic 3D information in form of the AVStereo3D struct.
1285 AV_PKT_DATA_STEREO3D,
1288 * This side data should be associated with an audio stream and corresponds
1289 * to enum AVAudioServiceType.
1291 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1294 * This side data contains quality related information from the encoder.
1296 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1300 * u64le[error count] sum of squared differences between encoder in and output
1303 AV_PKT_DATA_QUALITY_STATS,
1306 * Recommmends skipping the specified number of samples
1308 * u32le number of samples to skip from start of this packet
1309 * u32le number of samples to skip from end of this packet
1310 * u8 reason for start skip
1311 * u8 reason for end skip (0=padding silence, 1=convergence)
1314 AV_PKT_DATA_SKIP_SAMPLES=70,
1317 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1318 * the packet may contain "dual mono" audio specific to Japanese DTV
1319 * and if it is true, recommends only the selected channel to be used.
1321 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1324 AV_PKT_DATA_JP_DUALMONO,
1327 * A list of zero terminated key/value strings. There is no end marker for
1328 * the list, so it is required to rely on the side data size to stop.
1330 AV_PKT_DATA_STRINGS_METADATA,
1333 * Subtitle event position
1341 AV_PKT_DATA_SUBTITLE_POSITION,
1344 * Data found in BlockAdditional element of matroska container. There is
1345 * no end marker for the data, so it is required to rely on the side data
1346 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1349 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1352 * The optional first identifier line of a WebVTT cue.
1354 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1357 * The optional settings (rendering instructions) that immediately
1358 * follow the timestamp specifier of a WebVTT cue.
1360 AV_PKT_DATA_WEBVTT_SETTINGS,
1363 * A list of zero terminated key/value strings. There is no end marker for
1364 * the list, so it is required to rely on the side data size to stop. This
1365 * side data includes updated metadata which appeared in the stream.
1367 AV_PKT_DATA_METADATA_UPDATE,
1370 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1372 typedef struct AVPacketSideData {
1375 enum AVPacketSideDataType type;
1379 * This structure stores compressed data. It is typically exported by demuxers
1380 * and then passed as input to decoders, or received as output from encoders and
1381 * then passed to muxers.
1383 * For video, it should typically contain one compressed frame. For audio it may
1384 * contain several compressed frames.
1386 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1387 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1388 * without libavcodec and libavformat major bump.
1390 * The semantics of data ownership depends on the buf or destruct (deprecated)
1391 * fields. If either is set, the packet data is dynamically allocated and is
1392 * valid indefinitely until av_free_packet() is called (which in turn calls
1393 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1394 * the packet data is typically backed by some static buffer somewhere and is
1395 * only valid for a limited time (e.g. until the next read call when demuxing).
1397 * The side data is always allocated with av_malloc() and is freed in
1400 typedef struct AVPacket {
1402 * A reference to the reference-counted buffer where the packet data is
1404 * May be NULL, then the packet data is not reference-counted.
1408 * Presentation timestamp in AVStream->time_base units; the time at which
1409 * the decompressed packet will be presented to the user.
1410 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1411 * pts MUST be larger or equal to dts as presentation cannot happen before
1412 * decompression, unless one wants to view hex dumps. Some formats misuse
1413 * the terms dts and pts/cts to mean something different. Such timestamps
1414 * must be converted to true pts/dts before they are stored in AVPacket.
1418 * Decompression timestamp in AVStream->time_base units; the time at which
1419 * the packet is decompressed.
1420 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1427 * A combination of AV_PKT_FLAG values
1431 * Additional packet data that can be provided by the container.
1432 * Packet can contain several types of side information.
1434 AVPacketSideData *side_data;
1435 int side_data_elems;
1438 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1439 * Equals next_pts - this_pts in presentation order.
1442 #if FF_API_DESTRUCT_PACKET
1443 attribute_deprecated
1444 void (*destruct)(struct AVPacket *);
1445 attribute_deprecated
1448 int64_t pos; ///< byte position in stream, -1 if unknown
1451 * Time difference in AVStream->time_base units from the pts of this
1452 * packet to the point at which the output from the decoder has converged
1453 * independent from the availability of previous frames. That is, the
1454 * frames are virtually identical no matter if decoding started from
1455 * the very first frame or from this keyframe.
1456 * Is AV_NOPTS_VALUE if unknown.
1457 * This field is not the display duration of the current packet.
1458 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1461 * The purpose of this field is to allow seeking in streams that have no
1462 * keyframes in the conventional sense. It corresponds to the
1463 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1464 * essential for some types of subtitle streams to ensure that all
1465 * subtitles are correctly displayed after seeking.
1467 int64_t convergence_duration;
1469 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1470 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1472 enum AVSideDataParamChangeFlags {
1473 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1474 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1475 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1476 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1482 struct AVCodecInternal;
1486 AV_FIELD_PROGRESSIVE,
1487 AV_FIELD_TT, //< Top coded_first, top displayed first
1488 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1489 AV_FIELD_TB, //< Top coded first, bottom displayed first
1490 AV_FIELD_BT, //< Bottom coded first, top displayed first
1494 * main external API structure.
1495 * New fields can be added to the end with minor version bumps.
1496 * Removal, reordering and changes to existing fields require a major
1498 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1500 * sizeof(AVCodecContext) must not be used outside libav*.
1502 typedef struct AVCodecContext {
1504 * information on struct for av_log
1505 * - set by avcodec_alloc_context3
1507 const AVClass *av_class;
1508 int log_level_offset;
1510 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1511 const struct AVCodec *codec;
1512 #if FF_API_CODEC_NAME
1514 * @deprecated this field is not used for anything in libavcodec
1516 attribute_deprecated
1517 char codec_name[32];
1519 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1522 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1523 * This is used to work around some encoder bugs.
1524 * A demuxer should set this to what is stored in the field used to identify the codec.
1525 * If there are multiple such fields in a container then the demuxer should choose the one
1526 * which maximizes the information about the used codec.
1527 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1528 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1529 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1531 * - encoding: Set by user, if not then the default based on codec_id will be used.
1532 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1534 unsigned int codec_tag;
1536 #if FF_API_STREAM_CODEC_TAG
1538 * @deprecated this field is unused
1540 attribute_deprecated
1541 unsigned int stream_codec_tag;
1547 * Private context used for internal data.
1549 * Unlike priv_data, this is not codec-specific. It is used in general
1550 * libavcodec functions.
1552 struct AVCodecInternal *internal;
1555 * Private data of the user, can be used to carry app specific stuff.
1556 * - encoding: Set by user.
1557 * - decoding: Set by user.
1562 * the average bitrate
1563 * - encoding: Set by user; unused for constant quantizer encoding.
1564 * - decoding: Set by user, may be overwritten by libavcodec
1565 * if this info is available in the stream
1570 * number of bits the bitstream is allowed to diverge from the reference.
1571 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1572 * - encoding: Set by user; unused for constant quantizer encoding.
1573 * - decoding: unused
1575 int bit_rate_tolerance;
1578 * Global quality for codecs which cannot change it per frame.
1579 * This should be proportional to MPEG-1/2/4 qscale.
1580 * - encoding: Set by user.
1581 * - decoding: unused
1586 * - encoding: Set by user.
1587 * - decoding: unused
1589 int compression_level;
1590 #define FF_COMPRESSION_DEFAULT -1
1594 * - encoding: Set by user.
1595 * - decoding: Set by user.
1601 * - encoding: Set by user.
1602 * - decoding: Set by user.
1607 * some codecs need / can use extradata like Huffman tables.
1608 * mjpeg: Huffman tables
1609 * rv10: additional flags
1610 * mpeg4: global headers (they can be in the bitstream or here)
1611 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1612 * than extradata_size to avoid problems if it is read with the bitstream reader.
1613 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1614 * - encoding: Set/allocated/freed by libavcodec.
1615 * - decoding: Set/allocated/freed by user.
1621 * This is the fundamental unit of time (in seconds) in terms
1622 * of which frame timestamps are represented. For fixed-fps content,
1623 * timebase should be 1/framerate and timestamp increments should be
1625 * This often, but not always is the inverse of the frame rate or field rate
1627 * - encoding: MUST be set by user.
1628 * - decoding: the use of this field for decoding is deprecated.
1629 * Use framerate instead.
1631 AVRational time_base;
1634 * For some codecs, the time base is closer to the field rate than the frame rate.
1635 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1636 * if no telecine is used ...
1638 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1640 int ticks_per_frame;
1645 * Encoding: Number of frames delay there will be from the encoder input to
1646 * the decoder output. (we assume the decoder matches the spec)
1647 * Decoding: Number of frames delay in addition to what a standard decoder
1648 * as specified in the spec would produce.
1651 * Number of frames the decoded output will be delayed relative to the
1655 * For encoding, this field is unused (see initial_padding).
1657 * For decoding, this is the number of samples the decoder needs to
1658 * output before the decoder's output is valid. When seeking, you should
1659 * start decoding this many samples prior to your desired seek point.
1661 * - encoding: Set by libavcodec.
1662 * - decoding: Set by libavcodec.
1669 * picture width / height.
1671 * @note Those fields may not match the values of the last
1672 * AVFrame outputted by avcodec_decode_video2 due frame
1675 * - encoding: MUST be set by user.
1676 * - decoding: May be set by the user before opening the decoder if known e.g.
1677 * from the container. Some decoders will require the dimensions
1678 * to be set by the caller. During decoding, the decoder may
1679 * overwrite those values as required while parsing the data.
1684 * Bitstream width / height, may be different from width/height e.g. when
1685 * the decoded frame is cropped before being output or lowres is enabled.
1687 * @note Those field may not match the value of the last
1688 * AVFrame outputted by avcodec_decode_video2 due frame
1691 * - encoding: unused
1692 * - decoding: May be set by the user before opening the decoder if known
1693 * e.g. from the container. During decoding, the decoder may
1694 * overwrite those values as required while parsing the data.
1696 int coded_width, coded_height;
1698 #if FF_API_ASPECT_EXTENDED
1699 #define FF_ASPECT_EXTENDED 15
1703 * the number of pictures in a group of pictures, or 0 for intra_only
1704 * - encoding: Set by user.
1705 * - decoding: unused
1710 * Pixel format, see AV_PIX_FMT_xxx.
1711 * May be set by the demuxer if known from headers.
1712 * May be overridden by the decoder if it knows better.
1714 * @note This field may not match the value of the last
1715 * AVFrame outputted by avcodec_decode_video2 due frame
1718 * - encoding: Set by user.
1719 * - decoding: Set by user if known, overridden by libavcodec while
1722 enum AVPixelFormat pix_fmt;
1724 #if FF_API_MOTION_EST
1726 * This option does nothing
1727 * @deprecated use codec private options instead
1729 attribute_deprecated int me_method;
1733 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1734 * decoder to draw a horizontal band. It improves cache usage. Not
1735 * all codecs can do that. You must check the codec capabilities
1737 * When multithreading is used, it may be called from multiple threads
1738 * at the same time; threads might draw different parts of the same AVFrame,
1739 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1741 * The function is also used by hardware acceleration APIs.
1742 * It is called at least once during frame decoding to pass
1743 * the data needed for hardware render.
1744 * In that mode instead of pixel data, AVFrame points to
1745 * a structure specific to the acceleration API. The application
1746 * reads the structure and can change some fields to indicate progress
1748 * - encoding: unused
1749 * - decoding: Set by user.
1750 * @param height the height of the slice
1751 * @param y the y position of the slice
1752 * @param type 1->top field, 2->bottom field, 3->frame
1753 * @param offset offset into the AVFrame.data from which the slice should be read
1755 void (*draw_horiz_band)(struct AVCodecContext *s,
1756 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1757 int y, int type, int height);
1760 * callback to negotiate the pixelFormat
1761 * @param fmt is the list of formats which are supported by the codec,
1762 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1763 * The first is always the native one.
1764 * @note The callback may be called again immediately if initialization for
1765 * the selected (hardware-accelerated) pixel format failed.
1766 * @warning Behavior is undefined if the callback returns a value not
1767 * in the fmt list of formats.
1768 * @return the chosen format
1769 * - encoding: unused
1770 * - decoding: Set by user, if not set the native format will be chosen.
1772 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1775 * maximum number of B-frames between non-B-frames
1776 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1777 * - encoding: Set by user.
1778 * - decoding: unused
1783 * qscale factor between IP and B-frames
1784 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1785 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1786 * - encoding: Set by user.
1787 * - decoding: unused
1789 float b_quant_factor;
1791 #if FF_API_RC_STRATEGY
1792 /** @deprecated use codec private option instead */
1793 attribute_deprecated int rc_strategy;
1794 #define FF_RC_STRATEGY_XVID 1
1797 int b_frame_strategy;
1800 * qscale offset between IP and B-frames
1801 * - encoding: Set by user.
1802 * - decoding: unused
1804 float b_quant_offset;
1807 * Size of the frame reordering buffer in the decoder.
1808 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1809 * - encoding: Set by libavcodec.
1810 * - decoding: Set by libavcodec.
1815 * 0-> h263 quant 1-> mpeg quant
1816 * - encoding: Set by user.
1817 * - decoding: unused
1822 * qscale factor between P and I-frames
1823 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1824 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1825 * - encoding: Set by user.
1826 * - decoding: unused
1828 float i_quant_factor;
1831 * qscale offset between P and I-frames
1832 * - encoding: Set by user.
1833 * - decoding: unused
1835 float i_quant_offset;
1838 * luminance masking (0-> disabled)
1839 * - encoding: Set by user.
1840 * - decoding: unused
1845 * temporary complexity masking (0-> disabled)
1846 * - encoding: Set by user.
1847 * - decoding: unused
1849 float temporal_cplx_masking;
1852 * spatial complexity masking (0-> disabled)
1853 * - encoding: Set by user.
1854 * - decoding: unused
1856 float spatial_cplx_masking;
1859 * p block masking (0-> disabled)
1860 * - encoding: Set by user.
1861 * - decoding: unused
1866 * darkness masking (0-> disabled)
1867 * - encoding: Set by user.
1868 * - decoding: unused
1874 * - encoding: Set by libavcodec.
1875 * - decoding: Set by user (or 0).
1879 * prediction method (needed for huffyuv)
1880 * - encoding: Set by user.
1881 * - decoding: unused
1883 int prediction_method;
1884 #define FF_PRED_LEFT 0
1885 #define FF_PRED_PLANE 1
1886 #define FF_PRED_MEDIAN 2
1889 * slice offsets in the frame in bytes
1890 * - encoding: Set/allocated by libavcodec.
1891 * - decoding: Set/allocated by user (or NULL).
1896 * sample aspect ratio (0 if unknown)
1897 * That is the width of a pixel divided by the height of the pixel.
1898 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1899 * - encoding: Set by user.
1900 * - decoding: Set by libavcodec.
1902 AVRational sample_aspect_ratio;
1905 * motion estimation comparison function
1906 * - encoding: Set by user.
1907 * - decoding: unused
1911 * subpixel motion estimation comparison function
1912 * - encoding: Set by user.
1913 * - decoding: unused
1917 * macroblock comparison function (not supported yet)
1918 * - encoding: Set by user.
1919 * - decoding: unused
1923 * interlaced DCT comparison function
1924 * - encoding: Set by user.
1925 * - decoding: unused
1928 #define FF_CMP_SAD 0
1929 #define FF_CMP_SSE 1
1930 #define FF_CMP_SATD 2
1931 #define FF_CMP_DCT 3
1932 #define FF_CMP_PSNR 4
1933 #define FF_CMP_BIT 5
1935 #define FF_CMP_ZERO 7
1936 #define FF_CMP_VSAD 8
1937 #define FF_CMP_VSSE 9
1938 #define FF_CMP_NSSE 10
1939 #define FF_CMP_W53 11
1940 #define FF_CMP_W97 12
1941 #define FF_CMP_DCTMAX 13
1942 #define FF_CMP_DCT264 14
1943 #define FF_CMP_CHROMA 256
1946 * ME diamond size & shape
1947 * - encoding: Set by user.
1948 * - decoding: unused
1953 * amount of previous MV predictors (2a+1 x 2a+1 square)
1954 * - encoding: Set by user.
1955 * - decoding: unused
1957 int last_predictor_count;
1960 * prepass for motion estimation
1961 * - encoding: Set by user.
1962 * - decoding: unused
1967 * motion estimation prepass comparison function
1968 * - encoding: Set by user.
1969 * - decoding: unused
1974 * ME prepass diamond size & shape
1975 * - encoding: Set by user.
1976 * - decoding: unused
1982 * - encoding: Set by user.
1983 * - decoding: unused
1985 int me_subpel_quality;
1989 * DTG active format information (additional aspect ratio
1990 * information only used in DVB MPEG-2 transport streams)
1993 * - encoding: unused
1994 * - decoding: Set by decoder.
1995 * @deprecated Deprecated in favor of AVSideData
1997 attribute_deprecated int dtg_active_format;
1998 #define FF_DTG_AFD_SAME 8
1999 #define FF_DTG_AFD_4_3 9
2000 #define FF_DTG_AFD_16_9 10
2001 #define FF_DTG_AFD_14_9 11
2002 #define FF_DTG_AFD_4_3_SP_14_9 13
2003 #define FF_DTG_AFD_16_9_SP_14_9 14
2004 #define FF_DTG_AFD_SP_4_3 15
2005 #endif /* FF_API_AFD */
2008 * maximum motion estimation search range in subpel units
2009 * If 0 then no limit.
2011 * - encoding: Set by user.
2012 * - decoding: unused
2016 #if FF_API_QUANT_BIAS
2018 * @deprecated use encoder private option instead
2020 attribute_deprecated int intra_quant_bias;
2021 #define FF_DEFAULT_QUANT_BIAS 999999
2024 * @deprecated use encoder private option instead
2026 attribute_deprecated int inter_quant_bias;
2031 * - encoding: unused
2032 * - decoding: Set by user.
2035 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2036 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2037 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2041 * XVideo Motion Acceleration
2042 * - encoding: forbidden
2043 * - decoding: set by decoder
2044 * @deprecated XvMC doesn't need it anymore.
2046 attribute_deprecated int xvmc_acceleration;
2047 #endif /* FF_API_XVMC */
2050 * macroblock decision mode
2051 * - encoding: Set by user.
2052 * - decoding: unused
2055 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2056 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2057 #define FF_MB_DECISION_RD 2 ///< rate distortion
2060 * custom intra quantization matrix
2061 * - encoding: Set by user, can be NULL.
2062 * - decoding: Set by libavcodec.
2064 uint16_t *intra_matrix;
2067 * custom inter quantization matrix
2068 * - encoding: Set by user, can be NULL.
2069 * - decoding: Set by libavcodec.
2071 uint16_t *inter_matrix;
2074 * scene change detection threshold
2075 * 0 is default, larger means fewer detected scene changes.
2076 * - encoding: Set by user.
2077 * - decoding: unused
2079 int scenechange_threshold;
2082 * noise reduction strength
2083 * - encoding: Set by user.
2084 * - decoding: unused
2086 int noise_reduction;
2090 * @deprecated this field is unused
2092 attribute_deprecated
2096 * @deprecated this field is unused
2098 attribute_deprecated
2103 * precision of the intra DC coefficient - 8
2104 * - encoding: Set by user.
2105 * - decoding: Set by libavcodec
2107 int intra_dc_precision;
2110 * Number of macroblock rows at the top which are skipped.
2111 * - encoding: unused
2112 * - decoding: Set by user.
2117 * Number of macroblock rows at the bottom which are skipped.
2118 * - encoding: unused
2119 * - decoding: Set by user.
2125 * @deprecated use encoder private options instead
2127 attribute_deprecated
2128 float border_masking;
2132 * minimum MB lagrange multipler
2133 * - encoding: Set by user.
2134 * - decoding: unused
2139 * maximum MB lagrange multipler
2140 * - encoding: Set by user.
2141 * - decoding: unused
2147 * - encoding: Set by user.
2148 * - decoding: unused
2150 int me_penalty_compensation;
2154 * - encoding: Set by user.
2155 * - decoding: unused
2161 * - encoding: Set by user.
2162 * - decoding: unused
2168 * - encoding: Set by user.
2169 * - decoding: unused
2174 * number of reference frames
2175 * - encoding: Set by user.
2176 * - decoding: Set by lavc.
2181 * chroma qp offset from luma
2182 * - encoding: Set by user.
2183 * - decoding: unused
2187 #if FF_API_UNUSED_MEMBERS
2189 * Multiplied by qscale for each frame and added to scene_change_score.
2190 * - encoding: Set by user.
2191 * - decoding: unused
2193 attribute_deprecated int scenechange_factor;
2198 * Note: Value depends upon the compare function used for fullpel ME.
2199 * - encoding: Set by user.
2200 * - decoding: unused
2205 * Adjust sensitivity of b_frame_strategy 1.
2206 * - encoding: Set by user.
2207 * - decoding: unused
2212 * Chromaticity coordinates of the source primaries.
2213 * - encoding: Set by user
2214 * - decoding: Set by libavcodec
2216 enum AVColorPrimaries color_primaries;
2219 * Color Transfer Characteristic.
2220 * - encoding: Set by user
2221 * - decoding: Set by libavcodec
2223 enum AVColorTransferCharacteristic color_trc;
2226 * YUV colorspace type.
2227 * - encoding: Set by user
2228 * - decoding: Set by libavcodec
2230 enum AVColorSpace colorspace;
2233 * MPEG vs JPEG YUV range.
2234 * - encoding: Set by user
2235 * - decoding: Set by libavcodec
2237 enum AVColorRange color_range;
2240 * This defines the location of chroma samples.
2241 * - encoding: Set by user
2242 * - decoding: Set by libavcodec
2244 enum AVChromaLocation chroma_sample_location;
2248 * Indicates number of picture subdivisions. Used for parallelized
2250 * - encoding: Set by user
2251 * - decoding: unused
2256 * - encoding: set by libavcodec
2257 * - decoding: Set by user.
2259 enum AVFieldOrder field_order;
2262 int sample_rate; ///< samples per second
2263 int channels; ///< number of audio channels
2266 * audio sample format
2267 * - encoding: Set by user.
2268 * - decoding: Set by libavcodec.
2270 enum AVSampleFormat sample_fmt; ///< sample format
2272 /* The following data should not be initialized. */
2274 * Number of samples per channel in an audio frame.
2276 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2277 * except the last must contain exactly frame_size samples per channel.
2278 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2279 * frame size is not restricted.
2280 * - decoding: may be set by some decoders to indicate constant frame size
2285 * Frame counter, set by libavcodec.
2287 * - decoding: total number of frames returned from the decoder so far.
2288 * - encoding: total number of frames passed to the encoder so far.
2290 * @note the counter is not incremented if encoding/decoding resulted in
2296 * number of bytes per packet if constant and known or 0
2297 * Used by some WAV based audio codecs.
2302 * Audio cutoff bandwidth (0 means "automatic")
2303 * - encoding: Set by user.
2304 * - decoding: unused
2308 #if FF_API_REQUEST_CHANNELS
2310 * Decoder should decode to this many channels if it can (0 for default)
2311 * - encoding: unused
2312 * - decoding: Set by user.
2313 * @deprecated Deprecated in favor of request_channel_layout.
2315 attribute_deprecated int request_channels;
2319 * Audio channel layout.
2320 * - encoding: set by user.
2321 * - decoding: set by user, may be overwritten by libavcodec.
2323 uint64_t channel_layout;
2326 * Request decoder to use this channel layout if it can (0 for default)
2327 * - encoding: unused
2328 * - decoding: Set by user.
2330 uint64_t request_channel_layout;
2333 * Type of service that the audio stream conveys.
2334 * - encoding: Set by user.
2335 * - decoding: Set by libavcodec.
2337 enum AVAudioServiceType audio_service_type;
2340 * desired sample format
2341 * - encoding: Not used.
2342 * - decoding: Set by user.
2343 * Decoder will decode to this format if it can.
2345 enum AVSampleFormat request_sample_fmt;
2347 #if FF_API_GET_BUFFER
2349 * Called at the beginning of each frame to get a buffer for it.
2351 * The function will set AVFrame.data[], AVFrame.linesize[].
2352 * AVFrame.extended_data[] must also be set, but it should be the same as
2353 * AVFrame.data[] except for planar audio with more channels than can fit
2354 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2355 * many data pointers as it can hold.
2357 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2358 * avcodec_default_get_buffer() instead of providing buffers allocated by
2361 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2362 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2363 * but if get_buffer() is overridden then alignment considerations should
2364 * be taken into account.
2366 * @see avcodec_default_get_buffer()
2370 * If pic.reference is set then the frame will be read later by libavcodec.
2371 * avcodec_align_dimensions2() should be used to find the required width and
2372 * height, as they normally need to be rounded up to the next multiple of 16.
2374 * If frame multithreading is used and thread_safe_callbacks is set,
2375 * it may be called from a different thread, but not from more than one at
2376 * once. Does not need to be reentrant.
2378 * @see release_buffer(), reget_buffer()
2379 * @see avcodec_align_dimensions2()
2383 * Decoders request a buffer of a particular size by setting
2384 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2385 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2386 * to a smaller value in the output frame.
2388 * Decoders cannot use the buffer after returning from
2389 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2390 * is assumed to be released immediately upon return. In some rare cases,
2391 * a decoder may need to call get_buffer() more than once in a single
2392 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2393 * called again after it has already been called once, the previously
2394 * acquired buffer is assumed to be released at that time and may not be
2395 * reused by the decoder.
2397 * As a convenience, av_samples_get_buffer_size() and
2398 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2399 * functions to find the required data size and to fill data pointers and
2400 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2401 * since all planes must be the same size.
2403 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2405 * - encoding: unused
2406 * - decoding: Set by libavcodec, user can override.
2408 * @deprecated use get_buffer2()
2410 attribute_deprecated
2411 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2414 * Called to release buffers which were allocated with get_buffer.
2415 * A released buffer can be reused in get_buffer().
2416 * pic.data[*] must be set to NULL.
2417 * May be called from a different thread if frame multithreading is used,
2418 * but not by more than one thread at once, so does not need to be reentrant.
2419 * - encoding: unused
2420 * - decoding: Set by libavcodec, user can override.
2422 * @deprecated custom freeing callbacks should be set from get_buffer2()
2424 attribute_deprecated
2425 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2428 * Called at the beginning of a frame to get cr buffer for it.
2429 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2430 * libavcodec will pass previous buffer in pic, function should return
2431 * same buffer or new buffer with old frame "painted" into it.
2432 * If pic.data[0] == NULL must behave like get_buffer().
2433 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2434 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2436 * - encoding: unused
2437 * - decoding: Set by libavcodec, user can override.
2439 attribute_deprecated
2440 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2444 * This callback is called at the beginning of each frame to get data
2445 * buffer(s) for it. There may be one contiguous buffer for all the data or
2446 * there may be a buffer per each data plane or anything in between. What
2447 * this means is, you may set however many entries in buf[] you feel necessary.
2448 * Each buffer must be reference-counted using the AVBuffer API (see description
2451 * The following fields will be set in the frame before this callback is
2454 * - width, height (video only)
2455 * - sample_rate, channel_layout, nb_samples (audio only)
2456 * Their values may differ from the corresponding values in
2457 * AVCodecContext. This callback must use the frame values, not the codec
2458 * context values, to calculate the required buffer size.
2460 * This callback must fill the following fields in the frame:
2464 * * if the data is planar audio with more than 8 channels, then this
2465 * callback must allocate and fill extended_data to contain all pointers
2466 * to all data planes. data[] must hold as many pointers as it can.
2467 * extended_data must be allocated with av_malloc() and will be freed in
2469 * * otherwise exended_data must point to data
2470 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2471 * the frame's data and extended_data pointers must be contained in these. That
2472 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2473 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2474 * and av_buffer_ref().
2475 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2476 * this callback and filled with the extra buffers if there are more
2477 * buffers than buf[] can hold. extended_buf will be freed in
2480 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2481 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2484 * Each data plane must be aligned to the maximum required by the target
2487 * @see avcodec_default_get_buffer2()
2491 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2492 * (read and/or written to if it is writable) later by libavcodec.
2494 * avcodec_align_dimensions2() should be used to find the required width and
2495 * height, as they normally need to be rounded up to the next multiple of 16.
2497 * Some decoders do not support linesizes changing between frames.
2499 * If frame multithreading is used and thread_safe_callbacks is set,
2500 * this callback may be called from a different thread, but not from more
2501 * than one at once. Does not need to be reentrant.
2503 * @see avcodec_align_dimensions2()
2507 * Decoders request a buffer of a particular size by setting
2508 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2509 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2510 * to a smaller value in the output frame.
2512 * As a convenience, av_samples_get_buffer_size() and
2513 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2514 * functions to find the required data size and to fill data pointers and
2515 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2516 * since all planes must be the same size.
2518 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2520 * - encoding: unused
2521 * - decoding: Set by libavcodec, user can override.
2523 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2526 * If non-zero, the decoded audio and video frames returned from
2527 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2528 * and are valid indefinitely. The caller must free them with
2529 * av_frame_unref() when they are not needed anymore.
2530 * Otherwise, the decoded frames must not be freed by the caller and are
2531 * only valid until the next decode call.
2533 * - encoding: unused
2534 * - decoding: set by the caller before avcodec_open2().
2536 int refcounted_frames;
2538 /* - encoding parameters */
2539 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2540 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2544 * - encoding: Set by user.
2545 * - decoding: unused
2551 * - encoding: Set by user.
2552 * - decoding: unused
2557 * maximum quantizer difference between frames
2558 * - encoding: Set by user.
2559 * - decoding: unused
2565 * @deprecated use encoder private options instead
2567 attribute_deprecated
2570 attribute_deprecated
2572 attribute_deprecated
2577 * decoder bitstream buffer size
2578 * - encoding: Set by user.
2579 * - decoding: unused
2584 * ratecontrol override, see RcOverride
2585 * - encoding: Allocated/set/freed by user.
2586 * - decoding: unused
2588 int rc_override_count;
2589 RcOverride *rc_override;
2593 * @deprecated use encoder private options instead
2595 attribute_deprecated
2601 * - encoding: Set by user.
2602 * - decoding: Set by user, may be overwritten by libavcodec.
2608 * - encoding: Set by user.
2609 * - decoding: unused
2615 * @deprecated use encoder private options instead
2617 attribute_deprecated
2618 float rc_buffer_aggressivity;
2620 attribute_deprecated
2621 float rc_initial_cplx;
2625 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2626 * - encoding: Set by user.
2627 * - decoding: unused.
2629 float rc_max_available_vbv_use;
2632 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2633 * - encoding: Set by user.
2634 * - decoding: unused.
2636 float rc_min_vbv_overflow_use;
2639 * Number of bits which should be loaded into the rc buffer before decoding starts.
2640 * - encoding: Set by user.
2641 * - decoding: unused
2643 int rc_initial_buffer_occupancy;
2645 #define FF_CODER_TYPE_VLC 0
2646 #define FF_CODER_TYPE_AC 1
2647 #define FF_CODER_TYPE_RAW 2
2648 #define FF_CODER_TYPE_RLE 3
2649 #if FF_API_UNUSED_MEMBERS
2650 #define FF_CODER_TYPE_DEFLATE 4
2651 #endif /* FF_API_UNUSED_MEMBERS */
2654 * - encoding: Set by user.
2655 * - decoding: unused
2661 * - encoding: Set by user.
2662 * - decoding: unused
2668 * @deprecated use encoder private options instead
2670 attribute_deprecated
2674 * @deprecated use encoder private options instead
2676 attribute_deprecated
2681 * frame skip threshold
2682 * - encoding: Set by user.
2683 * - decoding: unused
2685 int frame_skip_threshold;
2689 * - encoding: Set by user.
2690 * - decoding: unused
2692 int frame_skip_factor;
2695 * frame skip exponent
2696 * - encoding: Set by user.
2697 * - decoding: unused
2702 * frame skip comparison function
2703 * - encoding: Set by user.
2704 * - decoding: unused
2709 * trellis RD quantization
2710 * - encoding: Set by user.
2711 * - decoding: unused
2716 * - encoding: Set by user.
2717 * - decoding: unused
2719 int min_prediction_order;
2722 * - encoding: Set by user.
2723 * - decoding: unused
2725 int max_prediction_order;
2728 * GOP timecode frame start number
2729 * - encoding: Set by user, in non drop frame format
2730 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2732 int64_t timecode_frame_start;
2734 /* The RTP callback: This function is called */
2735 /* every time the encoder has a packet to send. */
2736 /* It depends on the encoder if the data starts */
2737 /* with a Start Code (it should). H.263 does. */
2738 /* mb_nb contains the number of macroblocks */
2739 /* encoded in the RTP payload. */
2740 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2742 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2743 /* do its best to deliver a chunk with size */
2744 /* below rtp_payload_size, the chunk will start */
2745 /* with a start code on some codecs like H.263. */
2746 /* This doesn't take account of any particular */
2747 /* headers inside the transmitted RTP payload. */
2749 /* statistics, used for 2-pass encoding */
2760 * number of bits used for the previously encoded frame
2761 * - encoding: Set by libavcodec.
2762 * - decoding: unused
2767 * pass1 encoding statistics output buffer
2768 * - encoding: Set by libavcodec.
2769 * - decoding: unused
2774 * pass2 encoding statistics input buffer
2775 * Concatenated stuff from stats_out of pass1 should be placed here.
2776 * - encoding: Allocated/set/freed by user.
2777 * - decoding: unused
2782 * Work around bugs in encoders which sometimes cannot be detected automatically.
2783 * - encoding: Set by user
2784 * - decoding: Set by user
2786 int workaround_bugs;
2787 #define FF_BUG_AUTODETECT 1 ///< autodetection
2788 #if FF_API_OLD_MSMPEG4
2789 #define FF_BUG_OLD_MSMPEG4 2
2791 #define FF_BUG_XVID_ILACE 4
2792 #define FF_BUG_UMP4 8
2793 #define FF_BUG_NO_PADDING 16
2794 #define FF_BUG_AMV 32
2796 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2798 #define FF_BUG_QPEL_CHROMA 64
2799 #define FF_BUG_STD_QPEL 128
2800 #define FF_BUG_QPEL_CHROMA2 256
2801 #define FF_BUG_DIRECT_BLOCKSIZE 512
2802 #define FF_BUG_EDGE 1024
2803 #define FF_BUG_HPEL_CHROMA 2048
2804 #define FF_BUG_DC_CLIP 4096
2805 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2806 #define FF_BUG_TRUNCATED 16384
2809 * strictly follow the standard (MPEG4, ...).
2810 * - encoding: Set by user.
2811 * - decoding: Set by user.
2812 * Setting this to STRICT or higher means the encoder and decoder will
2813 * generally do stupid things, whereas setting it to unofficial or lower
2814 * will mean the encoder might produce output that is not supported by all
2815 * spec-compliant decoders. Decoders don't differentiate between normal,
2816 * unofficial and experimental (that is, they always try to decode things
2817 * when they can) unless they are explicitly asked to behave stupidly
2818 * (=strictly conform to the specs)
2820 int strict_std_compliance;
2821 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2822 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2823 #define FF_COMPLIANCE_NORMAL 0
2824 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2825 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2828 * error concealment flags
2829 * - encoding: unused
2830 * - decoding: Set by user.
2832 int error_concealment;
2833 #define FF_EC_GUESS_MVS 1
2834 #define FF_EC_DEBLOCK 2
2835 #define FF_EC_FAVOR_INTER 256
2839 * - encoding: Set by user.
2840 * - decoding: Set by user.
2843 #define FF_DEBUG_PICT_INFO 1
2844 #define FF_DEBUG_RC 2
2845 #define FF_DEBUG_BITSTREAM 4
2846 #define FF_DEBUG_MB_TYPE 8
2847 #define FF_DEBUG_QP 16
2850 * @deprecated this option does nothing
2852 #define FF_DEBUG_MV 32
2854 #define FF_DEBUG_DCT_COEFF 0x00000040
2855 #define FF_DEBUG_SKIP 0x00000080
2856 #define FF_DEBUG_STARTCODE 0x00000100
2857 #if FF_API_UNUSED_MEMBERS
2858 #define FF_DEBUG_PTS 0x00000200
2859 #endif /* FF_API_UNUSED_MEMBERS */
2860 #define FF_DEBUG_ER 0x00000400
2861 #define FF_DEBUG_MMCO 0x00000800
2862 #define FF_DEBUG_BUGS 0x00001000
2864 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2865 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2867 #define FF_DEBUG_BUFFERS 0x00008000
2868 #define FF_DEBUG_THREADS 0x00010000
2869 #define FF_DEBUG_GREEN_MD 0x00800000
2870 #define FF_DEBUG_NOMC 0x01000000
2875 * Code outside libavcodec should access this field using AVOptions
2876 * - encoding: Set by user.
2877 * - decoding: Set by user.
2880 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2881 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2882 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2886 * Error recognition; may misdetect some more or less valid parts as errors.
2887 * - encoding: unused
2888 * - decoding: Set by user.
2890 int err_recognition;
2893 * Verify checksums embedded in the bitstream (could be of either encoded or
2894 * decoded data, depending on the codec) and print an error message on mismatch.
2895 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2896 * decoder returning an error.
2898 #define AV_EF_CRCCHECK (1<<0)
2899 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2900 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2901 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2903 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2904 #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
2905 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2906 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2910 * opaque 64bit number (generally a PTS) that will be reordered and
2911 * output in AVFrame.reordered_opaque
2912 * - encoding: unused
2913 * - decoding: Set by user.
2915 int64_t reordered_opaque;
2918 * Hardware accelerator in use
2919 * - encoding: unused.
2920 * - decoding: Set by libavcodec
2922 struct AVHWAccel *hwaccel;
2925 * Hardware accelerator context.
2926 * For some hardware accelerators, a global context needs to be
2927 * provided by the user. In that case, this holds display-dependent
2928 * data FFmpeg cannot instantiate itself. Please refer to the
2929 * FFmpeg HW accelerator documentation to know how to fill this
2930 * is. e.g. for VA API, this is a struct vaapi_context.
2931 * - encoding: unused
2932 * - decoding: Set by user
2934 void *hwaccel_context;
2938 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2939 * - decoding: unused
2941 uint64_t error[AV_NUM_DATA_POINTERS];
2944 * DCT algorithm, see FF_DCT_* below
2945 * - encoding: Set by user.
2946 * - decoding: unused
2949 #define FF_DCT_AUTO 0
2950 #define FF_DCT_FASTINT 1
2951 #define FF_DCT_INT 2
2952 #define FF_DCT_MMX 3
2953 #define FF_DCT_ALTIVEC 5
2954 #define FF_DCT_FAAN 6
2957 * IDCT algorithm, see FF_IDCT_* below.
2958 * - encoding: Set by user.
2959 * - decoding: Set by user.
2962 #define FF_IDCT_AUTO 0
2963 #define FF_IDCT_INT 1
2964 #define FF_IDCT_SIMPLE 2
2965 #define FF_IDCT_SIMPLEMMX 3
2966 #define FF_IDCT_ARM 7
2967 #define FF_IDCT_ALTIVEC 8
2969 #define FF_IDCT_SH4 9
2971 #define FF_IDCT_SIMPLEARM 10
2972 #if FF_API_UNUSED_MEMBERS
2973 #define FF_IDCT_IPP 13
2974 #endif /* FF_API_UNUSED_MEMBERS */
2975 #define FF_IDCT_XVID 14
2976 #if FF_API_IDCT_XVIDMMX
2977 #define FF_IDCT_XVIDMMX 14
2978 #endif /* FF_API_IDCT_XVIDMMX */
2979 #define FF_IDCT_SIMPLEARMV5TE 16
2980 #define FF_IDCT_SIMPLEARMV6 17
2981 #if FF_API_ARCH_SPARC
2982 #define FF_IDCT_SIMPLEVIS 18
2984 #define FF_IDCT_FAAN 20
2985 #define FF_IDCT_SIMPLENEON 22
2986 #if FF_API_ARCH_ALPHA
2987 #define FF_IDCT_SIMPLEALPHA 23
2989 #define FF_IDCT_SIMPLEAUTO 128
2992 * bits per sample/pixel from the demuxer (needed for huffyuv).
2993 * - encoding: Set by libavcodec.
2994 * - decoding: Set by user.
2996 int bits_per_coded_sample;
2999 * Bits per sample/pixel of internal libavcodec pixel/sample format.
3000 * - encoding: set by user.
3001 * - decoding: set by libavcodec.
3003 int bits_per_raw_sample;
3007 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3008 * - encoding: unused
3009 * - decoding: Set by user.
3010 * Code outside libavcodec should access this field using:
3011 * av_codec_{get,set}_lowres(avctx)
3016 #if FF_API_CODED_FRAME
3018 * the picture in the bitstream
3019 * - encoding: Set by libavcodec.
3020 * - decoding: unused
3022 * @deprecated use the quality factor packet side data instead
3024 attribute_deprecated AVFrame *coded_frame;
3029 * is used to decide how many independent tasks should be passed to execute()
3030 * - encoding: Set by user.
3031 * - decoding: Set by user.
3036 * Which multithreading methods to use.
3037 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
3038 * so clients which cannot provide future frames should not use it.
3040 * - encoding: Set by user, otherwise the default is used.
3041 * - decoding: Set by user, otherwise the default is used.
3044 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
3045 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
3048 * Which multithreading methods are in use by the codec.
3049 * - encoding: Set by libavcodec.
3050 * - decoding: Set by libavcodec.
3052 int active_thread_type;
3055 * Set by the client if its custom get_buffer() callback can be called
3056 * synchronously from another thread, which allows faster multithreaded decoding.
3057 * draw_horiz_band() will be called from other threads regardless of this setting.
3058 * Ignored if the default get_buffer() is used.
3059 * - encoding: Set by user.
3060 * - decoding: Set by user.
3062 int thread_safe_callbacks;
3065 * The codec may call this to execute several independent things.
3066 * It will return only after finishing all tasks.
3067 * The user may replace this with some multithreaded implementation,
3068 * the default implementation will execute the parts serially.
3069 * @param count the number of things to execute
3070 * - encoding: Set by libavcodec, user can override.
3071 * - decoding: Set by libavcodec, user can override.
3073 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
3076 * The codec may call this to execute several independent things.
3077 * It will return only after finishing all tasks.
3078 * The user may replace this with some multithreaded implementation,
3079 * the default implementation will execute the parts serially.
3080 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
3081 * @param c context passed also to func
3082 * @param count the number of things to execute
3083 * @param arg2 argument passed unchanged to func
3084 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
3085 * @param func function that will be called count times, with jobnr from 0 to count-1.
3086 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
3087 * two instances of func executing at the same time will have the same threadnr.
3088 * @return always 0 currently, but code should handle a future improvement where when any call to func
3089 * returns < 0 no further calls to func may be done and < 0 is returned.
3090 * - encoding: Set by libavcodec, user can override.
3091 * - decoding: Set by libavcodec, user can override.
3093 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
3095 #if FF_API_THREAD_OPAQUE
3097 * @deprecated this field should not be used from outside of lavc
3099 attribute_deprecated
3100 void *thread_opaque;
3104 * noise vs. sse weight for the nsse comparison function
3105 * - encoding: Set by user.
3106 * - decoding: unused
3112 * - encoding: Set by user.
3113 * - decoding: Set by libavcodec.
3116 #define FF_PROFILE_UNKNOWN -99
3117 #define FF_PROFILE_RESERVED -100
3119 #define FF_PROFILE_AAC_MAIN 0
3120 #define FF_PROFILE_AAC_LOW 1
3121 #define FF_PROFILE_AAC_SSR 2
3122 #define FF_PROFILE_AAC_LTP 3
3123 #define FF_PROFILE_AAC_HE 4
3124 #define FF_PROFILE_AAC_HE_V2 28
3125 #define FF_PROFILE_AAC_LD 22
3126 #define FF_PROFILE_AAC_ELD 38
3127 #define FF_PROFILE_MPEG2_AAC_LOW 128
3128 #define FF_PROFILE_MPEG2_AAC_HE 131
3130 #define FF_PROFILE_DTS 20
3131 #define FF_PROFILE_DTS_ES 30
3132 #define FF_PROFILE_DTS_96_24 40
3133 #define FF_PROFILE_DTS_HD_HRA 50
3134 #define FF_PROFILE_DTS_HD_MA 60
3135 #define FF_PROFILE_DTS_EXPRESS 70
3137 #define FF_PROFILE_MPEG2_422 0
3138 #define FF_PROFILE_MPEG2_HIGH 1
3139 #define FF_PROFILE_MPEG2_SS 2
3140 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
3141 #define FF_PROFILE_MPEG2_MAIN 4
3142 #define FF_PROFILE_MPEG2_SIMPLE 5
3144 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
3145 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
3147 #define FF_PROFILE_H264_BASELINE 66
3148 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
3149 #define FF_PROFILE_H264_MAIN 77
3150 #define FF_PROFILE_H264_EXTENDED 88
3151 #define FF_PROFILE_H264_HIGH 100
3152 #define FF_PROFILE_H264_HIGH_10 110
3153 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
3154 #define FF_PROFILE_H264_HIGH_422 122
3155 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
3156 #define FF_PROFILE_H264_HIGH_444 144
3157 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
3158 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
3159 #define FF_PROFILE_H264_CAVLC_444 44
3161 #define FF_PROFILE_VC1_SIMPLE 0
3162 #define FF_PROFILE_VC1_MAIN 1
3163 #define FF_PROFILE_VC1_COMPLEX 2
3164 #define FF_PROFILE_VC1_ADVANCED 3
3166 #define FF_PROFILE_MPEG4_SIMPLE 0
3167 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
3168 #define FF_PROFILE_MPEG4_CORE 2
3169 #define FF_PROFILE_MPEG4_MAIN 3
3170 #define FF_PROFILE_MPEG4_N_BIT 4
3171 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
3172 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
3173 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
3174 #define FF_PROFILE_MPEG4_HYBRID 8
3175 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
3176 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
3177 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
3178 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
3179 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
3180 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
3181 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
3183 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
3184 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
3185 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
3186 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3187 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3189 #define FF_PROFILE_VP9_0 0
3190 #define FF_PROFILE_VP9_1 1
3191 #define FF_PROFILE_VP9_2 2
3192 #define FF_PROFILE_VP9_3 3
3194 #define FF_PROFILE_HEVC_MAIN 1
3195 #define FF_PROFILE_HEVC_MAIN_10 2
3196 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3197 #define FF_PROFILE_HEVC_REXT 4
3201 * - encoding: Set by user.
3202 * - decoding: Set by libavcodec.
3205 #define FF_LEVEL_UNKNOWN -99
3208 * Skip loop filtering for selected frames.
3209 * - encoding: unused
3210 * - decoding: Set by user.
3212 enum AVDiscard skip_loop_filter;
3215 * Skip IDCT/dequantization for selected frames.
3216 * - encoding: unused
3217 * - decoding: Set by user.
3219 enum AVDiscard skip_idct;
3222 * Skip decoding for selected frames.
3223 * - encoding: unused
3224 * - decoding: Set by user.
3226 enum AVDiscard skip_frame;
3229 * Header containing style information for text subtitles.
3230 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3231 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3232 * the Format line following. It shouldn't include any Dialogue line.
3233 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3234 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3236 uint8_t *subtitle_header;
3237 int subtitle_header_size;
3239 #if FF_API_ERROR_RATE
3241 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3244 attribute_deprecated
3248 #if FF_API_CODEC_PKT
3250 * @deprecated this field is not supposed to be accessed from outside lavc
3252 attribute_deprecated
3257 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3258 * Used for compliant TS muxing.
3259 * - encoding: Set by libavcodec.
3260 * - decoding: unused.
3265 * Encoding only. Allow encoders to output packets that do not contain any
3266 * encoded data, only side data.
3268 * Some encoders need to output such packets, e.g. to update some stream
3269 * parameters at the end of encoding.
3271 * All callers are strongly recommended to set this option to 1 and update
3272 * their code to deal with such packets, since this behaviour may become
3273 * always enabled in the future (then this option will be deprecated and
3274 * later removed). To avoid ABI issues when this happens, the callers should
3275 * use AVOptions to set this field.
3277 int side_data_only_packets;
3280 * Audio only. The number of "priming" samples (padding) inserted by the
3281 * encoder at the beginning of the audio. I.e. this number of leading
3282 * decoded samples must be discarded by the caller to get the original audio
3283 * without leading padding.
3285 * - decoding: unused
3286 * - encoding: Set by libavcodec. The timestamps on the output packets are
3287 * adjusted by the encoder so that they always refer to the
3288 * first sample of the data actually contained in the packet,
3289 * including any added padding. E.g. if the timebase is
3290 * 1/samplerate and the timestamp of the first input sample is
3291 * 0, the timestamp of the first output packet will be
3294 int initial_padding;
3297 * - decoding: For codecs that store a framerate value in the compressed
3298 * bitstream, the decoder may export it here. { 0, 1} when
3300 * - encoding: unused
3302 AVRational framerate;
3305 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3306 * - encoding: unused.
3307 * - decoding: Set by libavcodec before calling get_format()
3309 enum AVPixelFormat sw_pix_fmt;
3312 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3313 * Code outside libavcodec should access this field using:
3314 * av_codec_{get,set}_pkt_timebase(avctx)
3315 * - encoding unused.
3316 * - decoding set by user.
3318 AVRational pkt_timebase;
3322 * Code outside libavcodec should access this field using:
3323 * av_codec_{get,set}_codec_descriptor(avctx)
3324 * - encoding: unused.
3325 * - decoding: set by libavcodec.
3327 const AVCodecDescriptor *codec_descriptor;
3331 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3332 * - encoding: unused
3333 * - decoding: Set by user.
3334 * Code outside libavcodec should access this field using:
3335 * av_codec_{get,set}_lowres(avctx)
3341 * Current statistics for PTS correction.
3342 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3343 * - encoding: unused
3345 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3346 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3347 int64_t pts_correction_last_pts; /// PTS of the last frame
3348 int64_t pts_correction_last_dts; /// DTS of the last frame
3351 * Character encoding of the input subtitles file.
3352 * - decoding: set by user
3353 * - encoding: unused
3358 * Subtitles character encoding mode. Formats or codecs might be adjusting
3359 * this setting (if they are doing the conversion themselves for instance).
3360 * - decoding: set by libavcodec
3361 * - encoding: unused
3363 int sub_charenc_mode;
3364 #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)
3365 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3366 #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
3369 * Skip processing alpha if supported by codec.
3370 * Note that if the format uses pre-multiplied alpha (common with VP6,
3371 * and recommended due to better video quality/compression)
3372 * the image will look as if alpha-blended onto a black background.
3373 * However for formats that do not use pre-multiplied alpha
3374 * there might be serious artefacts (though e.g. libswscale currently
3375 * assumes pre-multiplied alpha anyway).
3376 * Code outside libavcodec should access this field using AVOptions
3378 * - decoding: set by user
3379 * - encoding: unused
3384 * Number of samples to skip after a discontinuity
3385 * - decoding: unused
3386 * - encoding: set by libavcodec
3390 #if !FF_API_DEBUG_MV
3392 * debug motion vectors
3393 * Code outside libavcodec should access this field using AVOptions
3394 * - encoding: Set by user.
3395 * - decoding: Set by user.
3398 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3399 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3400 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3404 * custom intra quantization matrix
3405 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3406 * - encoding: Set by user, can be NULL.
3407 * - decoding: unused.
3409 uint16_t *chroma_intra_matrix;
3412 * dump format separator.
3413 * can be ", " or "\n " or anything else
3414 * Code outside libavcodec should access this field using AVOptions
3415 * (NO direct access).
3416 * - encoding: Set by user.
3417 * - decoding: Set by user.
3419 uint8_t *dump_separator;
3422 * ',' separated list of allowed decoders.
3423 * If NULL then all are allowed
3424 * - encoding: unused
3425 * - decoding: set by user through AVOPtions (NO direct access)
3427 char *codec_whitelist;
3430 * Properties of the stream that gets decoded
3431 * To be accessed through av_codec_get_properties() (NO direct access)
3432 * - encoding: unused
3433 * - decoding: set by libavcodec
3435 unsigned properties;
3436 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3437 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3440 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3441 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3443 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3444 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3446 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3448 int av_codec_get_lowres(const AVCodecContext *avctx);
3449 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3451 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3452 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3454 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3455 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3460 typedef struct AVProfile {
3462 const char *name; ///< short name for the profile
3465 typedef struct AVCodecDefault AVCodecDefault;
3472 typedef struct AVCodec {
3474 * Name of the codec implementation.
3475 * The name is globally unique among encoders and among decoders (but an
3476 * encoder and a decoder can share the same name).
3477 * This is the primary way to find a codec from the user perspective.
3481 * Descriptive name for the codec, meant to be more human readable than name.
3482 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3484 const char *long_name;
3485 enum AVMediaType type;
3488 * Codec capabilities.
3489 * see AV_CODEC_CAP_*
3492 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3493 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3494 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3495 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3496 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3497 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3498 const AVClass *priv_class; ///< AVClass for the private context
3499 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3501 /*****************************************************************
3502 * No fields below this line are part of the public API. They
3503 * may not be used outside of libavcodec and can be changed and
3505 * New public fields should be added right above.
3506 *****************************************************************
3509 struct AVCodec *next;
3511 * @name Frame-level threading support functions
3515 * If defined, called on thread contexts when they are created.
3516 * If the codec allocates writable tables in init(), re-allocate them here.
3517 * priv_data will be set to a copy of the original.
3519 int (*init_thread_copy)(AVCodecContext *);
3521 * Copy necessary context variables from a previous thread context to the current one.
3522 * If not defined, the next thread will start automatically; otherwise, the codec
3523 * must call ff_thread_finish_setup().
3525 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3527 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3531 * Private codec-specific defaults.
3533 const AVCodecDefault *defaults;
3536 * Initialize codec static data, called from avcodec_register().
3538 void (*init_static_data)(struct AVCodec *codec);
3540 int (*init)(AVCodecContext *);
3541 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3542 const struct AVSubtitle *sub);
3544 * Encode data to an AVPacket.
3546 * @param avctx codec context
3547 * @param avpkt output AVPacket (may contain a user-provided buffer)
3548 * @param[in] frame AVFrame containing the raw data to be encoded
3549 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3550 * non-empty packet was returned in avpkt.
3551 * @return 0 on success, negative error code on failure
3553 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3554 int *got_packet_ptr);
3555 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3556 int (*close)(AVCodecContext *);
3559 * Will be called when seeking
3561 void (*flush)(AVCodecContext *);
3563 * Internal codec capabilities.
3564 * See FF_CODEC_CAP_* in internal.h
3569 int av_codec_get_max_lowres(const AVCodec *codec);
3571 struct MpegEncContext;
3574 * @defgroup lavc_hwaccel AVHWAccel
3577 typedef struct AVHWAccel {
3579 * Name of the hardware accelerated codec.
3580 * The name is globally unique among encoders and among decoders (but an
3581 * encoder and a decoder can share the same name).
3586 * Type of codec implemented by the hardware accelerator.
3588 * See AVMEDIA_TYPE_xxx
3590 enum AVMediaType type;
3593 * Codec implemented by the hardware accelerator.
3595 * See AV_CODEC_ID_xxx
3600 * Supported pixel format.
3602 * Only hardware accelerated formats are supported here.
3604 enum AVPixelFormat pix_fmt;
3607 * Hardware accelerated codec capabilities.
3608 * see HWACCEL_CODEC_CAP_*
3612 /*****************************************************************
3613 * No fields below this line are part of the public API. They
3614 * may not be used outside of libavcodec and can be changed and
3616 * New public fields should be added right above.
3617 *****************************************************************
3619 struct AVHWAccel *next;
3622 * Allocate a custom buffer
3624 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3627 * Called at the beginning of each frame or field picture.
3629 * Meaningful frame information (codec specific) is guaranteed to
3630 * be parsed at this point. This function is mandatory.
3632 * Note that buf can be NULL along with buf_size set to 0.
3633 * Otherwise, this means the whole frame is available at this point.
3635 * @param avctx the codec context
3636 * @param buf the frame data buffer base
3637 * @param buf_size the size of the frame in bytes
3638 * @return zero if successful, a negative value otherwise
3640 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3643 * Callback for each slice.
3645 * Meaningful slice information (codec specific) is guaranteed to
3646 * be parsed at this point. This function is mandatory.
3647 * The only exception is XvMC, that works on MB level.
3649 * @param avctx the codec context
3650 * @param buf the slice data buffer base
3651 * @param buf_size the size of the slice in bytes
3652 * @return zero if successful, a negative value otherwise
3654 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3657 * Called at the end of each frame or field picture.
3659 * The whole picture is parsed at this point and can now be sent
3660 * to the hardware accelerator. This function is mandatory.
3662 * @param avctx the codec context
3663 * @return zero if successful, a negative value otherwise
3665 int (*end_frame)(AVCodecContext *avctx);
3668 * Size of per-frame hardware accelerator private data.
3670 * Private data is allocated with av_mallocz() before
3671 * AVCodecContext.get_buffer() and deallocated after
3672 * AVCodecContext.release_buffer().
3674 int frame_priv_data_size;
3677 * Called for every Macroblock in a slice.
3679 * XvMC uses it to replace the ff_mpv_decode_mb().
3680 * Instead of decoding to raw picture, MB parameters are
3681 * stored in an array provided by the video driver.
3683 * @param s the mpeg context
3685 void (*decode_mb)(struct MpegEncContext *s);
3688 * Initialize the hwaccel private data.
3690 * This will be called from ff_get_format(), after hwaccel and
3691 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3694 int (*init)(AVCodecContext *avctx);
3697 * Uninitialize the hwaccel private data.
3699 * This will be called from get_format() or avcodec_close(), after hwaccel
3700 * and hwaccel_context are already uninitialized.
3702 int (*uninit)(AVCodecContext *avctx);
3705 * Size of the private data to allocate in
3706 * AVCodecInternal.hwaccel_priv_data.
3712 * Hardware acceleration should be used for decoding even if the codec level
3713 * used is unknown or higher than the maximum supported level reported by the
3716 * It's generally a good idea to pass this flag unless you have a specific
3717 * reason not to, as hardware tends to under-report supported levels.
3719 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3722 * Hardware acceleration can output YUV pixel formats with a different chroma
3723 * sampling than 4:2:0 and/or other than 8 bits per component.
3725 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3732 * @defgroup lavc_picture AVPicture
3734 * Functions for working with AVPicture
3739 * Picture data structure.
3741 * Up to four components can be stored into it, the last component is
3744 typedef struct AVPicture {
3745 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3746 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3753 enum AVSubtitleType {
3756 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3759 * Plain text, the text field must be set by the decoder and is
3760 * authoritative. ass and pict fields may contain approximations.
3765 * Formatted text, the ass field must be set by the decoder and is
3766 * authoritative. pict and text fields may contain approximations.
3771 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3773 typedef struct AVSubtitleRect {
3774 int x; ///< top left corner of pict, undefined when pict is not set
3775 int y; ///< top left corner of pict, undefined when pict is not set
3776 int w; ///< width of pict, undefined when pict is not set
3777 int h; ///< height of pict, undefined when pict is not set
3778 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3781 * data+linesize for the bitmap of this subtitle.
3782 * can be set for text/ass as well once they are rendered
3785 enum AVSubtitleType type;
3787 char *text; ///< 0 terminated plain UTF-8 text
3790 * 0 terminated ASS/SSA compatible event line.
3791 * The presentation of this is unaffected by the other values in this
3799 typedef struct AVSubtitle {
3800 uint16_t format; /* 0 = graphics */
3801 uint32_t start_display_time; /* relative to packet pts, in ms */
3802 uint32_t end_display_time; /* relative to packet pts, in ms */
3804 AVSubtitleRect **rects;
3805 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3809 * If c is NULL, returns the first registered codec,
3810 * if c is non-NULL, returns the next registered codec after c,
3811 * or NULL if c is the last one.
3813 AVCodec *av_codec_next(const AVCodec *c);
3816 * Return the LIBAVCODEC_VERSION_INT constant.
3818 unsigned avcodec_version(void);
3821 * Return the libavcodec build-time configuration.
3823 const char *avcodec_configuration(void);
3826 * Return the libavcodec license.
3828 const char *avcodec_license(void);
3831 * Register the codec codec and initialize libavcodec.
3833 * @warning either this function or avcodec_register_all() must be called
3834 * before any other libavcodec functions.
3836 * @see avcodec_register_all()
3838 void avcodec_register(AVCodec *codec);
3841 * Register all the codecs, parsers and bitstream filters which were enabled at
3842 * configuration time. If you do not call this function you can select exactly
3843 * which formats you want to support, by using the individual registration
3846 * @see avcodec_register
3847 * @see av_register_codec_parser
3848 * @see av_register_bitstream_filter
3850 void avcodec_register_all(void);
3853 * Allocate an AVCodecContext and set its fields to default values. The
3854 * resulting struct should be freed with avcodec_free_context().
3856 * @param codec if non-NULL, allocate private data and initialize defaults
3857 * for the given codec. It is illegal to then call avcodec_open2()
3858 * with a different codec.
3859 * If NULL, then the codec-specific defaults won't be initialized,
3860 * which may result in suboptimal default settings (this is
3861 * important mainly for encoders, e.g. libx264).
3863 * @return An AVCodecContext filled with default values or NULL on failure.
3864 * @see avcodec_get_context_defaults
3866 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3869 * Free the codec context and everything associated with it and write NULL to
3870 * the provided pointer.
3872 void avcodec_free_context(AVCodecContext **avctx);
3875 * Set the fields of the given AVCodecContext to default values corresponding
3876 * to the given codec (defaults may be codec-dependent).
3878 * Do not call this function if a non-NULL codec has been passed
3879 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3880 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3881 * different codec on this AVCodecContext.
3883 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3886 * Get the AVClass for AVCodecContext. It can be used in combination with
3887 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3889 * @see av_opt_find().
3891 const AVClass *avcodec_get_class(void);
3894 * Get the AVClass for AVFrame. It can be used in combination with
3895 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3897 * @see av_opt_find().
3899 const AVClass *avcodec_get_frame_class(void);
3902 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3903 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3905 * @see av_opt_find().
3907 const AVClass *avcodec_get_subtitle_rect_class(void);
3910 * Copy the settings of the source AVCodecContext into the destination
3911 * AVCodecContext. The resulting destination codec context will be
3912 * unopened, i.e. you are required to call avcodec_open2() before you
3913 * can use this AVCodecContext to decode/encode video/audio data.
3915 * @param dest target codec context, should be initialized with
3916 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3917 * @param src source codec context
3918 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3920 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3922 #if FF_API_AVFRAME_LAVC
3924 * @deprecated use av_frame_alloc()
3926 attribute_deprecated
3927 AVFrame *avcodec_alloc_frame(void);
3930 * Set the fields of the given AVFrame to default values.
3932 * @param frame The AVFrame of which the fields should be set to default values.
3934 * @deprecated use av_frame_unref()
3936 attribute_deprecated
3937 void avcodec_get_frame_defaults(AVFrame *frame);
3940 * Free the frame and any dynamically allocated objects in it,
3941 * e.g. extended_data.
3943 * @param frame frame to be freed. The pointer will be set to NULL.
3945 * @warning this function does NOT free the data buffers themselves
3946 * (it does not know how, since they might have been allocated with
3947 * a custom get_buffer()).
3949 * @deprecated use av_frame_free()
3951 attribute_deprecated
3952 void avcodec_free_frame(AVFrame **frame);
3956 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3957 * function the context has to be allocated with avcodec_alloc_context3().
3959 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3960 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3961 * retrieving a codec.
3963 * @warning This function is not thread safe!
3965 * @note Always call this function before using decoding routines (such as
3966 * @ref avcodec_decode_video2()).
3969 * avcodec_register_all();
3970 * av_dict_set(&opts, "b", "2.5M", 0);
3971 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3975 * context = avcodec_alloc_context3(codec);
3977 * if (avcodec_open2(context, codec, opts) < 0)
3981 * @param avctx The context to initialize.
3982 * @param codec The codec to open this context for. If a non-NULL codec has been
3983 * previously passed to avcodec_alloc_context3() or
3984 * avcodec_get_context_defaults3() for this context, then this
3985 * parameter MUST be either NULL or equal to the previously passed
3987 * @param options A dictionary filled with AVCodecContext and codec-private options.
3988 * On return this object will be filled with options that were not found.
3990 * @return zero on success, a negative value on error
3991 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3992 * av_dict_set(), av_opt_find().
3994 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3997 * Close a given AVCodecContext and free all the data associated with it
3998 * (but not the AVCodecContext itself).
4000 * Calling this function on an AVCodecContext that hasn't been opened will free
4001 * the codec-specific data allocated in avcodec_alloc_context3() /
4002 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
4005 int avcodec_close(AVCodecContext *avctx);
4008 * Free all allocated data in the given subtitle struct.
4010 * @param sub AVSubtitle to free.
4012 void avsubtitle_free(AVSubtitle *sub);
4019 * @addtogroup lavc_packet
4023 #if FF_API_DESTRUCT_PACKET
4025 * Default packet destructor.
4026 * @deprecated use the AVBuffer API instead
4028 attribute_deprecated
4029 void av_destruct_packet(AVPacket *pkt);
4033 * Initialize optional fields of a packet with default values.
4035 * Note, this does not touch the data and size members, which have to be
4036 * initialized separately.
4040 void av_init_packet(AVPacket *pkt);
4043 * Allocate the payload of a packet and initialize its fields with
4047 * @param size wanted payload size
4048 * @return 0 if OK, AVERROR_xxx otherwise
4050 int av_new_packet(AVPacket *pkt, int size);
4053 * Reduce packet size, correctly zeroing padding
4056 * @param size new size
4058 void av_shrink_packet(AVPacket *pkt, int size);
4061 * Increase packet size, correctly zeroing padding
4064 * @param grow_by number of bytes by which to increase the size of the packet
4066 int av_grow_packet(AVPacket *pkt, int grow_by);
4069 * Initialize a reference-counted packet from av_malloc()ed data.
4071 * @param pkt packet to be initialized. This function will set the data, size,
4072 * buf and destruct fields, all others are left untouched.
4073 * @param data Data allocated by av_malloc() to be used as packet data. If this
4074 * function returns successfully, the data is owned by the underlying AVBuffer.
4075 * The caller may not access the data through other means.
4076 * @param size size of data in bytes, without the padding. I.e. the full buffer
4077 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4079 * @return 0 on success, a negative AVERROR on error
4081 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4084 * @warning This is a hack - the packet memory allocation stuff is broken. The
4085 * packet is allocated if it was not really allocated.
4087 int av_dup_packet(AVPacket *pkt);
4090 * Copy packet, including contents
4092 * @return 0 on success, negative AVERROR on fail
4094 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4097 * Copy packet side data
4099 * @return 0 on success, negative AVERROR on fail
4101 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4106 * @param pkt packet to free
4108 void av_free_packet(AVPacket *pkt);
4111 * Allocate new information of a packet.
4114 * @param type side information type
4115 * @param size side information size
4116 * @return pointer to fresh allocated data or NULL otherwise
4118 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4122 * Shrink the already allocated side data buffer
4125 * @param type side information type
4126 * @param size new side information size
4127 * @return 0 on success, < 0 on failure
4129 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4133 * Get side information from packet.
4136 * @param type desired side information type
4137 * @param size pointer for side information size to store (optional)
4138 * @return pointer to data if present or NULL otherwise
4140 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4143 int av_packet_merge_side_data(AVPacket *pkt);
4145 int av_packet_split_side_data(AVPacket *pkt);
4147 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4150 * Pack a dictionary for use in side_data.
4152 * @param dict The dictionary to pack.
4153 * @param size pointer to store the size of the returned data
4154 * @return pointer to data if successful, NULL otherwise
4156 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4158 * Unpack a dictionary from side_data.
4160 * @param data data from side_data
4161 * @param size size of the data
4162 * @param dict the metadata storage dictionary
4163 * @return 0 on success, < 0 on failure
4165 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4169 * Convenience function to free all the side data stored.
4170 * All the other fields stay untouched.
4174 void av_packet_free_side_data(AVPacket *pkt);
4177 * Setup a new reference to the data described by a given packet
4179 * If src is reference-counted, setup dst as a new reference to the
4180 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4181 * data from src into it.
4183 * All the other fields are copied from src.
4185 * @see av_packet_unref
4187 * @param dst Destination packet
4188 * @param src Source packet
4190 * @return 0 on success, a negative AVERROR on error.
4192 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4197 * Unreference the buffer referenced by the packet and reset the
4198 * remaining packet fields to their default values.
4200 * @param pkt The packet to be unreferenced.
4202 void av_packet_unref(AVPacket *pkt);
4205 * Move every field in src to dst and reset src.
4207 * @see av_packet_unref
4209 * @param src Source packet, will be reset
4210 * @param dst Destination packet
4212 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4215 * Copy only "properties" fields from src to dst.
4217 * Properties for the purpose of this function are all the fields
4218 * beside those related to the packet data (buf, data, size)
4220 * @param dst Destination packet
4221 * @param src Source packet
4223 * @return 0 on success AVERROR on failure.
4226 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4229 * Convert valid timing fields (timestamps / durations) in a packet from one
4230 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4233 * @param pkt packet on which the conversion will be performed
4234 * @param tb_src source timebase, in which the timing fields in pkt are
4236 * @param tb_dst destination timebase, to which the timing fields will be
4239 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4246 * @addtogroup lavc_decoding
4251 * Find a registered decoder with a matching codec ID.
4253 * @param id AVCodecID of the requested decoder
4254 * @return A decoder if one was found, NULL otherwise.
4256 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4259 * Find a registered decoder with the specified name.
4261 * @param name name of the requested decoder
4262 * @return A decoder if one was found, NULL otherwise.
4264 AVCodec *avcodec_find_decoder_by_name(const char *name);
4266 #if FF_API_GET_BUFFER
4267 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
4268 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
4269 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
4273 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4274 * it can be called by custom get_buffer2() implementations for decoders without
4275 * AV_CODEC_CAP_DR1 set.
4277 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4281 * Return the amount of padding in pixels which the get_buffer callback must
4282 * provide around the edge of the image for codecs which do not have the
4283 * CODEC_FLAG_EMU_EDGE flag.
4285 * @return Required padding in pixels.
4287 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4290 attribute_deprecated
4291 unsigned avcodec_get_edge_width(void);
4295 * Modify width and height values so that they will result in a memory
4296 * buffer that is acceptable for the codec if you do not use any horizontal
4299 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4301 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4304 * Modify width and height values so that they will result in a memory
4305 * buffer that is acceptable for the codec if you also ensure that all
4306 * line sizes are a multiple of the respective linesize_align[i].
4308 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4310 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4311 int linesize_align[AV_NUM_DATA_POINTERS]);
4314 * Converts AVChromaLocation to swscale x/y chroma position.
4316 * The positions represent the chroma (0,0) position in a coordinates system
4317 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4319 * @param xpos horizontal chroma sample position
4320 * @param ypos vertical chroma sample position
4322 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4325 * Converts swscale x/y chroma position to AVChromaLocation.
4327 * The positions represent the chroma (0,0) position in a coordinates system
4328 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4330 * @param xpos horizontal chroma sample position
4331 * @param ypos vertical chroma sample position
4333 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4335 #if FF_API_OLD_DECODE_AUDIO
4337 * Wrapper function which calls avcodec_decode_audio4.
4339 * @deprecated Use avcodec_decode_audio4 instead.
4341 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
4342 * Some decoders may support multiple frames in a single AVPacket, such
4343 * decoders would then just decode the first frame. In this case,
4344 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
4345 * the remaining data in order to decode the second frame etc.
4347 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
4348 * decompressed frame size in bytes.
4350 * @warning You must set frame_size_ptr to the allocated size of the
4351 * output buffer before calling avcodec_decode_audio3().
4353 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4354 * the actual read bytes because some optimized bitstream readers read 32 or 64
4355 * bits at once and could read over the end.
4357 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
4358 * no overreading happens for damaged MPEG streams.
4360 * @warning You must not provide a custom get_buffer() when using
4361 * avcodec_decode_audio3(). Doing so will override it with
4362 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
4363 * which does allow the application to provide a custom get_buffer().
4365 * @note You might have to align the input buffer avpkt->data and output buffer
4366 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
4367 * necessary at all, on others it won't work at all if not aligned and on others
4368 * it will work but it will have an impact on performance.
4370 * In practice, avpkt->data should have 4 byte alignment at minimum and
4371 * samples should be 16 byte aligned unless the CPU doesn't need it
4372 * (AltiVec and SSE do).
4374 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4375 * between input and output, these need to be fed with avpkt->data=NULL,
4376 * avpkt->size=0 at the end to return the remaining frames.
4378 * @param avctx the codec context
4379 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
4380 * If the sample format is planar, each channel plane will
4381 * be the same size, with no padding between channels.
4382 * @param[in,out] frame_size_ptr the output buffer size in bytes
4383 * @param[in] avpkt The input AVPacket containing the input buffer.
4384 * You can create such packet with av_init_packet() and by then setting
4385 * data and size, some decoders might in addition need other fields.
4386 * All decoders are designed to use the least fields possible though.
4387 * @return On error a negative value is returned, otherwise the number of bytes
4388 * used or zero if no frame data was decompressed (used) from the input AVPacket.
4390 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
4391 int *frame_size_ptr,
4396 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4398 * Some decoders may support multiple frames in a single AVPacket. Such
4399 * decoders would then just decode the first frame and the return value would be
4400 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4401 * called again with an AVPacket containing the remaining data in order to
4402 * decode the second frame, etc... Even if no frames are returned, the packet
4403 * needs to be fed to the decoder with remaining data until it is completely
4404 * consumed or an error occurs.
4406 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4407 * and output. This means that for some packets they will not immediately
4408 * produce decoded output and need to be flushed at the end of decoding to get
4409 * all the decoded data. Flushing is done by calling this function with packets
4410 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4411 * returning samples. It is safe to flush even those decoders that are not
4412 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4414 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4415 * larger than the actual read bytes because some optimized bitstream
4416 * readers read 32 or 64 bits at once and could read over the end.
4418 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4419 * before packets may be fed to the decoder.
4421 * @param avctx the codec context
4422 * @param[out] frame The AVFrame in which to store decoded audio samples.
4423 * The decoder will allocate a buffer for the decoded frame by
4424 * calling the AVCodecContext.get_buffer2() callback.
4425 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4426 * reference counted and the returned reference belongs to the
4427 * caller. The caller must release the frame using av_frame_unref()
4428 * when the frame is no longer needed. The caller may safely write
4429 * to the frame if av_frame_is_writable() returns 1.
4430 * When AVCodecContext.refcounted_frames is set to 0, the returned
4431 * reference belongs to the decoder and is valid only until the
4432 * next call to this function or until closing or flushing the
4433 * decoder. The caller may not write to it.
4434 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4435 * non-zero. Note that this field being set to zero
4436 * does not mean that an error has occurred. For
4437 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4438 * call is guaranteed to produce a frame.
4439 * @param[in] avpkt The input AVPacket containing the input buffer.
4440 * At least avpkt->data and avpkt->size should be set. Some
4441 * decoders might also require additional fields to be set.
4442 * @return A negative error code is returned if an error occurred during
4443 * decoding, otherwise the number of bytes consumed from the input
4444 * AVPacket is returned.
4446 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4447 int *got_frame_ptr, const AVPacket *avpkt);
4450 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4451 * Some decoders may support multiple frames in a single AVPacket, such
4452 * decoders would then just decode the first frame.
4454 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4455 * the actual read bytes because some optimized bitstream readers read 32 or 64
4456 * bits at once and could read over the end.
4458 * @warning The end of the input buffer buf should be set to 0 to ensure that
4459 * no overreading happens for damaged MPEG streams.
4461 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4462 * between input and output, these need to be fed with avpkt->data=NULL,
4463 * avpkt->size=0 at the end to return the remaining frames.
4465 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4466 * before packets may be fed to the decoder.
4468 * @param avctx the codec context
4469 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4470 * Use av_frame_alloc() to get an AVFrame. The codec will
4471 * allocate memory for the actual bitmap by calling the
4472 * AVCodecContext.get_buffer2() callback.
4473 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4474 * reference counted and the returned reference belongs to the
4475 * caller. The caller must release the frame using av_frame_unref()
4476 * when the frame is no longer needed. The caller may safely write
4477 * to the frame if av_frame_is_writable() returns 1.
4478 * When AVCodecContext.refcounted_frames is set to 0, the returned
4479 * reference belongs to the decoder and is valid only until the
4480 * next call to this function or until closing or flushing the
4481 * decoder. The caller may not write to it.
4483 * @param[in] avpkt The input AVPacket containing the input buffer.
4484 * You can create such packet with av_init_packet() and by then setting
4485 * data and size, some decoders might in addition need other fields like
4486 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4488 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4489 * @return On error a negative value is returned, otherwise the number of bytes
4490 * used or zero if no frame could be decompressed.
4492 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4493 int *got_picture_ptr,
4494 const AVPacket *avpkt);
4497 * Decode a subtitle message.
4498 * Return a negative value on error, otherwise return the number of bytes used.
4499 * If no subtitle could be decompressed, got_sub_ptr is zero.
4500 * Otherwise, the subtitle is stored in *sub.
4501 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4502 * simplicity, because the performance difference is expect to be negligible
4503 * and reusing a get_buffer written for video codecs would probably perform badly
4504 * due to a potentially very different allocation pattern.
4506 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4507 * and output. This means that for some packets they will not immediately
4508 * produce decoded output and need to be flushed at the end of decoding to get
4509 * all the decoded data. Flushing is done by calling this function with packets
4510 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4511 * returning subtitles. It is safe to flush even those decoders that are not
4512 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4514 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4515 * before packets may be fed to the decoder.
4517 * @param avctx the codec context
4518 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4519 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4520 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4521 * @param[in] avpkt The input AVPacket containing the input buffer.
4523 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4528 * @defgroup lavc_parsing Frame parsing
4532 enum AVPictureStructure {
4533 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4534 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4535 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4536 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4539 typedef struct AVCodecParserContext {
4541 struct AVCodecParser *parser;
4542 int64_t frame_offset; /* offset of the current frame */
4543 int64_t cur_offset; /* current offset
4544 (incremented by each av_parser_parse()) */
4545 int64_t next_frame_offset; /* offset of the next frame */
4547 int pict_type; /* XXX: Put it back in AVCodecContext. */
4549 * This field is used for proper frame duration computation in lavf.
4550 * It signals, how much longer the frame duration of the current frame
4551 * is compared to normal frame duration.
4553 * frame_duration = (1 + repeat_pict) * time_base
4555 * It is used by codecs like H.264 to display telecined material.
4557 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4558 int64_t pts; /* pts of the current frame */
4559 int64_t dts; /* dts of the current frame */
4564 int fetch_timestamp;
4566 #define AV_PARSER_PTS_NB 4
4567 int cur_frame_start_index;
4568 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4569 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4570 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4573 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4574 #define PARSER_FLAG_ONCE 0x0002
4575 /// Set if the parser has a valid file offset
4576 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4577 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4579 int64_t offset; ///< byte offset from starting packet start
4580 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4583 * Set by parser to 1 for key frames and 0 for non-key frames.
4584 * It is initialized to -1, so if the parser doesn't set this flag,
4585 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4591 * Time difference in stream time base units from the pts of this
4592 * packet to the point at which the output from the decoder has converged
4593 * independent from the availability of previous frames. That is, the
4594 * frames are virtually identical no matter if decoding started from
4595 * the very first frame or from this keyframe.
4596 * Is AV_NOPTS_VALUE if unknown.
4597 * This field is not the display duration of the current frame.
4598 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4601 * The purpose of this field is to allow seeking in streams that have no
4602 * keyframes in the conventional sense. It corresponds to the
4603 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4604 * essential for some types of subtitle streams to ensure that all
4605 * subtitles are correctly displayed after seeking.
4607 int64_t convergence_duration;
4609 // Timestamp generation support:
4611 * Synchronization point for start of timestamp generation.
4613 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4616 * For example, this corresponds to presence of H.264 buffering period
4622 * Offset of the current timestamp against last timestamp sync point in
4623 * units of AVCodecContext.time_base.
4625 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4626 * contain a valid timestamp offset.
4628 * Note that the timestamp of sync point has usually a nonzero
4629 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4630 * the next frame after timestamp sync point will be usually 1.
4632 * For example, this corresponds to H.264 cpb_removal_delay.
4634 int dts_ref_dts_delta;
4637 * Presentation delay of current frame in units of AVCodecContext.time_base.
4639 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4640 * contain valid non-negative timestamp delta (presentation time of a frame
4641 * must not lie in the past).
4643 * This delay represents the difference between decoding and presentation
4644 * time of the frame.
4646 * For example, this corresponds to H.264 dpb_output_delay.
4651 * Position of the packet in file.
4653 * Analogous to cur_frame_pts/dts
4655 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4658 * Byte position of currently parsed frame in stream.
4663 * Previous frame byte position.
4668 * Duration of the current frame.
4669 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4670 * For all other types, this is in units of AVCodecContext.time_base.
4674 enum AVFieldOrder field_order;
4677 * Indicate whether a picture is coded as a frame, top field or bottom field.
4679 * For example, H.264 field_pic_flag equal to 0 corresponds to
4680 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4681 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4682 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4684 enum AVPictureStructure picture_structure;
4687 * Picture number incremented in presentation or output order.
4688 * This field may be reinitialized at the first picture of a new sequence.
4690 * For example, this corresponds to H.264 PicOrderCnt.
4692 int output_picture_number;
4695 * Dimensions of the decoded video intended for presentation.
4701 * Dimensions of the coded video.
4707 * The format of the coded data, corresponds to enum AVPixelFormat for video
4708 * and for enum AVSampleFormat for audio.
4710 * Note that a decoder can have considerable freedom in how exactly it
4711 * decodes the data, so the format reported here might be different from the
4712 * one returned by a decoder.
4715 } AVCodecParserContext;
4717 typedef struct AVCodecParser {
4718 int codec_ids[5]; /* several codec IDs are permitted */
4720 int (*parser_init)(AVCodecParserContext *s);
4721 /* This callback never returns an error, a negative value means that
4722 * the frame start was in a previous packet. */
4723 int (*parser_parse)(AVCodecParserContext *s,
4724 AVCodecContext *avctx,
4725 const uint8_t **poutbuf, int *poutbuf_size,
4726 const uint8_t *buf, int buf_size);
4727 void (*parser_close)(AVCodecParserContext *s);
4728 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4729 struct AVCodecParser *next;
4732 AVCodecParser *av_parser_next(const AVCodecParser *c);
4734 void av_register_codec_parser(AVCodecParser *parser);
4735 AVCodecParserContext *av_parser_init(int codec_id);
4740 * @param s parser context.
4741 * @param avctx codec context.
4742 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4743 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4744 * @param buf input buffer.
4745 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4746 * @param pts input presentation timestamp.
4747 * @param dts input decoding timestamp.
4748 * @param pos input byte position in stream.
4749 * @return the number of bytes of the input bitstream used.
4754 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4761 * decode_frame(data, size);
4765 int av_parser_parse2(AVCodecParserContext *s,
4766 AVCodecContext *avctx,
4767 uint8_t **poutbuf, int *poutbuf_size,
4768 const uint8_t *buf, int buf_size,
4769 int64_t pts, int64_t dts,
4773 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4774 * @deprecated use AVBitStreamFilter
4776 int av_parser_change(AVCodecParserContext *s,
4777 AVCodecContext *avctx,
4778 uint8_t **poutbuf, int *poutbuf_size,
4779 const uint8_t *buf, int buf_size, int keyframe);
4780 void av_parser_close(AVCodecParserContext *s);
4788 * @addtogroup lavc_encoding
4793 * Find a registered encoder with a matching codec ID.
4795 * @param id AVCodecID of the requested encoder
4796 * @return An encoder if one was found, NULL otherwise.
4798 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4801 * Find a registered encoder with the specified name.
4803 * @param name name of the requested encoder
4804 * @return An encoder if one was found, NULL otherwise.
4806 AVCodec *avcodec_find_encoder_by_name(const char *name);
4808 #if FF_API_OLD_ENCODE_AUDIO
4810 * Encode an audio frame from samples into buf.
4812 * @deprecated Use avcodec_encode_audio2 instead.
4814 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4815 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4816 * will know how much space is needed because it depends on the value passed
4817 * in buf_size as described below. In that case a lower value can be used.
4819 * @param avctx the codec context
4820 * @param[out] buf the output buffer
4821 * @param[in] buf_size the output buffer size
4822 * @param[in] samples the input buffer containing the samples
4823 * The number of samples read from this buffer is frame_size*channels,
4824 * both of which are defined in avctx.
4825 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4826 * samples read from samples is equal to:
4827 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4828 * This also implies that av_get_bits_per_sample() must not return 0 for these
4830 * @return On error a negative value is returned, on success zero or the number
4831 * of bytes used to encode the data read from the input buffer.
4833 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4834 uint8_t *buf, int buf_size,
4835 const short *samples);
4839 * Encode a frame of audio.
4841 * Takes input samples from frame and writes the next output packet, if
4842 * available, to avpkt. The output packet does not necessarily contain data for
4843 * the most recent frame, as encoders can delay, split, and combine input frames
4844 * internally as needed.
4846 * @param avctx codec context
4847 * @param avpkt output AVPacket.
4848 * The user can supply an output buffer by setting
4849 * avpkt->data and avpkt->size prior to calling the
4850 * function, but if the size of the user-provided data is not
4851 * large enough, encoding will fail. If avpkt->data and
4852 * avpkt->size are set, avpkt->destruct must also be set. All
4853 * other AVPacket fields will be reset by the encoder using
4854 * av_init_packet(). If avpkt->data is NULL, the encoder will
4855 * allocate it. The encoder will set avpkt->size to the size
4856 * of the output packet.
4858 * If this function fails or produces no output, avpkt will be
4859 * freed using av_free_packet() (i.e. avpkt->destruct will be
4860 * called to free the user supplied buffer).
4861 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4862 * May be NULL when flushing an encoder that has the
4863 * AV_CODEC_CAP_DELAY capability set.
4864 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4865 * can have any number of samples.
4866 * If it is not set, frame->nb_samples must be equal to
4867 * avctx->frame_size for all frames except the last.
4868 * The final frame may be smaller than avctx->frame_size.
4869 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4870 * output packet is non-empty, and to 0 if it is
4871 * empty. If the function returns an error, the
4872 * packet can be assumed to be invalid, and the
4873 * value of got_packet_ptr is undefined and should
4875 * @return 0 on success, negative error code on failure
4877 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4878 const AVFrame *frame, int *got_packet_ptr);
4880 #if FF_API_OLD_ENCODE_VIDEO
4882 * @deprecated use avcodec_encode_video2() instead.
4884 * Encode a video frame from pict into buf.
4885 * The input picture should be
4886 * stored using a specific format, namely avctx.pix_fmt.
4888 * @param avctx the codec context
4889 * @param[out] buf the output buffer for the bitstream of encoded frame
4890 * @param[in] buf_size the size of the output buffer in bytes
4891 * @param[in] pict the input picture to encode
4892 * @return On error a negative value is returned, on success zero or the number
4893 * of bytes used from the output buffer.
4895 attribute_deprecated
4896 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4897 const AVFrame *pict);
4901 * Encode a frame of video.
4903 * Takes input raw video data from frame and writes the next output packet, if
4904 * available, to avpkt. The output packet does not necessarily contain data for
4905 * the most recent frame, as encoders can delay and reorder input frames
4906 * internally as needed.
4908 * @param avctx codec context
4909 * @param avpkt output AVPacket.
4910 * The user can supply an output buffer by setting
4911 * avpkt->data and avpkt->size prior to calling the
4912 * function, but if the size of the user-provided data is not
4913 * large enough, encoding will fail. All other AVPacket fields
4914 * will be reset by the encoder using av_init_packet(). If
4915 * avpkt->data is NULL, the encoder will allocate it.
4916 * The encoder will set avpkt->size to the size of the
4917 * output packet. The returned data (if any) belongs to the
4918 * caller, he is responsible for freeing it.
4920 * If this function fails or produces no output, avpkt will be
4921 * freed using av_free_packet() (i.e. avpkt->destruct will be
4922 * called to free the user supplied buffer).
4923 * @param[in] frame AVFrame containing the raw video data to be encoded.
4924 * May be NULL when flushing an encoder that has the
4925 * AV_CODEC_CAP_DELAY capability set.
4926 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4927 * output packet is non-empty, and to 0 if it is
4928 * empty. If the function returns an error, the
4929 * packet can be assumed to be invalid, and the
4930 * value of got_packet_ptr is undefined and should
4932 * @return 0 on success, negative error code on failure
4934 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4935 const AVFrame *frame, int *got_packet_ptr);
4937 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4938 const AVSubtitle *sub);
4945 #if FF_API_AVCODEC_RESAMPLE
4947 * @defgroup lavc_resample Audio resampling
4949 * @deprecated use libswresample instead
4953 struct ReSampleContext;
4954 struct AVResampleContext;
4956 typedef struct ReSampleContext ReSampleContext;
4959 * Initialize audio resampling context.
4961 * @param output_channels number of output channels
4962 * @param input_channels number of input channels
4963 * @param output_rate output sample rate
4964 * @param input_rate input sample rate
4965 * @param sample_fmt_out requested output sample format
4966 * @param sample_fmt_in input sample format
4967 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4968 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4969 * @param linear if 1 then the used FIR filter will be linearly interpolated
4970 between the 2 closest, if 0 the closest will be used
4971 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4972 * @return allocated ReSampleContext, NULL if error occurred
4974 attribute_deprecated
4975 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4976 int output_rate, int input_rate,
4977 enum AVSampleFormat sample_fmt_out,
4978 enum AVSampleFormat sample_fmt_in,
4979 int filter_length, int log2_phase_count,
4980 int linear, double cutoff);
4982 attribute_deprecated
4983 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4986 * Free resample context.
4988 * @param s a non-NULL pointer to a resample context previously
4989 * created with av_audio_resample_init()
4991 attribute_deprecated
4992 void audio_resample_close(ReSampleContext *s);
4996 * Initialize an audio resampler.
4997 * Note, if either rate is not an integer then simply scale both rates up so they are.
4998 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4999 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
5000 * @param linear If 1 then the used FIR filter will be linearly interpolated
5001 between the 2 closest, if 0 the closest will be used
5002 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
5004 attribute_deprecated
5005 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
5008 * Resample an array of samples using a previously configured context.
5009 * @param src an array of unconsumed samples
5010 * @param consumed the number of samples of src which have been consumed are returned here
5011 * @param src_size the number of unconsumed samples available
5012 * @param dst_size the amount of space in samples available in dst
5013 * @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.
5014 * @return the number of samples written in dst or -1 if an error occurred
5016 attribute_deprecated
5017 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
5021 * Compensate samplerate/timestamp drift. The compensation is done by changing
5022 * the resampler parameters, so no audible clicks or similar distortions occur
5023 * @param compensation_distance distance in output samples over which the compensation should be performed
5024 * @param sample_delta number of output samples which should be output less
5026 * example: av_resample_compensate(c, 10, 500)
5027 * here instead of 510 samples only 500 samples would be output
5029 * note, due to rounding the actual compensation might be slightly different,
5030 * especially if the compensation_distance is large and the in_rate used during init is small
5032 attribute_deprecated
5033 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
5034 attribute_deprecated
5035 void av_resample_close(struct AVResampleContext *c);
5043 * @addtogroup lavc_picture
5048 * Allocate memory for the pixels of a picture and setup the AVPicture
5051 * Call avpicture_free() to free it.
5053 * @param picture the picture structure to be filled in
5054 * @param pix_fmt the pixel format of the picture
5055 * @param width the width of the picture
5056 * @param height the height of the picture
5057 * @return zero if successful, a negative error code otherwise
5059 * @see av_image_alloc(), avpicture_fill()
5061 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5064 * Free a picture previously allocated by avpicture_alloc().
5065 * The data buffer used by the AVPicture is freed, but the AVPicture structure
5068 * @param picture the AVPicture to be freed
5070 void avpicture_free(AVPicture *picture);
5073 * Setup the picture fields based on the specified image parameters
5074 * and the provided image data buffer.
5076 * The picture fields are filled in by using the image data buffer
5077 * pointed to by ptr.
5079 * If ptr is NULL, the function will fill only the picture linesize
5080 * array and return the required size for the image buffer.
5082 * To allocate an image buffer and fill the picture data in one call,
5083 * use avpicture_alloc().
5085 * @param picture the picture to be filled in
5086 * @param ptr buffer where the image data is stored, or NULL
5087 * @param pix_fmt the pixel format of the image
5088 * @param width the width of the image in pixels
5089 * @param height the height of the image in pixels
5090 * @return the size in bytes required for src, a negative error code
5091 * in case of failure
5093 * @see av_image_fill_arrays()
5095 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5096 enum AVPixelFormat pix_fmt, int width, int height);
5099 * Copy pixel data from an AVPicture into a buffer.
5101 * avpicture_get_size() can be used to compute the required size for
5102 * the buffer to fill.
5104 * @param src source picture with filled data
5105 * @param pix_fmt picture pixel format
5106 * @param width picture width
5107 * @param height picture height
5108 * @param dest destination buffer
5109 * @param dest_size destination buffer size in bytes
5110 * @return the number of bytes written to dest, or a negative value
5111 * (error code) on error, for example if the destination buffer is not
5114 * @see av_image_copy_to_buffer()
5116 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
5117 int width, int height,
5118 unsigned char *dest, int dest_size);
5121 * Calculate the size in bytes that a picture of the given width and height
5122 * would occupy if stored in the given picture format.
5124 * @param pix_fmt picture pixel format
5125 * @param width picture width
5126 * @param height picture height
5127 * @return the computed picture buffer size or a negative error code
5130 * @see av_image_get_buffer_size().
5132 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
5134 #if FF_API_DEINTERLACE
5136 * deinterlace - if not supported return -1
5138 * @deprecated - use yadif (in libavfilter) instead
5140 attribute_deprecated
5141 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
5142 enum AVPixelFormat pix_fmt, int width, int height);
5145 * Copy image src to dst. Wraps av_image_copy().
5147 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5148 enum AVPixelFormat pix_fmt, int width, int height);
5151 * Crop image top and left side.
5153 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5154 enum AVPixelFormat pix_fmt, int top_band, int left_band);
5159 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5160 int padtop, int padbottom, int padleft, int padright, int *color);
5167 * @defgroup lavc_misc Utility functions
5170 * Miscellaneous utility functions related to both encoding and decoding
5176 * @defgroup lavc_misc_pixfmt Pixel formats
5178 * Functions for working with pixel formats.
5183 * Utility function to access log2_chroma_w log2_chroma_h from
5184 * the pixel format AVPixFmtDescriptor.
5186 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
5187 * for one that returns a failure code and continues in case of invalid
5190 * @param[in] pix_fmt the pixel format
5191 * @param[out] h_shift store log2_chroma_w
5192 * @param[out] v_shift store log2_chroma_h
5194 * @see av_pix_fmt_get_chroma_sub_sample
5197 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5200 * Return a value representing the fourCC code associated to the
5201 * pixel format pix_fmt, or 0 if no associated fourCC code can be
5204 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
5207 * @deprecated see av_get_pix_fmt_loss()
5209 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5213 * Find the best pixel format to convert to given a certain source pixel
5214 * format. When converting from one pixel format to another, information loss
5215 * may occur. For example, when converting from RGB24 to GRAY, the color
5216 * information will be lost. Similarly, other losses occur when converting from
5217 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5218 * the given pixel formats should be used to suffer the least amount of loss.
5219 * The pixel formats from which it chooses one, are determined by the
5220 * pix_fmt_list parameter.
5223 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5224 * @param[in] src_pix_fmt source pixel format
5225 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5226 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5227 * @return The best pixel format to convert to or -1 if none was found.
5229 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5230 enum AVPixelFormat src_pix_fmt,
5231 int has_alpha, int *loss_ptr);
5234 * @deprecated see av_find_best_pix_fmt_of_2()
5236 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5237 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5239 attribute_deprecated
5240 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
5241 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
5242 enum AVPixelFormat src_pix_fmt,
5243 int has_alpha, int *loss_ptr);
5245 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5246 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5250 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5256 #if FF_API_SET_DIMENSIONS
5258 * @deprecated this function is not supposed to be used from outside of lavc
5260 attribute_deprecated
5261 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
5265 * Put a string representing the codec tag codec_tag in buf.
5267 * @param buf buffer to place codec tag in
5268 * @param buf_size size in bytes of buf
5269 * @param codec_tag codec tag to assign
5270 * @return the length of the string that would have been generated if
5271 * enough space had been available, excluding the trailing null
5273 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5275 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5278 * Return a name for the specified profile, if available.
5280 * @param codec the codec that is searched for the given profile
5281 * @param profile the profile value for which a name is requested
5282 * @return A name for the profile if found, NULL otherwise.
5284 const char *av_get_profile_name(const AVCodec *codec, int profile);
5286 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5287 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5288 //FIXME func typedef
5291 * Fill AVFrame audio data and linesize pointers.
5293 * The buffer buf must be a preallocated buffer with a size big enough
5294 * to contain the specified samples amount. The filled AVFrame data
5295 * pointers will point to this buffer.
5297 * AVFrame extended_data channel pointers are allocated if necessary for
5300 * @param frame the AVFrame
5301 * frame->nb_samples must be set prior to calling the
5302 * function. This function fills in frame->data,
5303 * frame->extended_data, frame->linesize[0].
5304 * @param nb_channels channel count
5305 * @param sample_fmt sample format
5306 * @param buf buffer to use for frame data
5307 * @param buf_size size of buffer
5308 * @param align plane size sample alignment (0 = default)
5309 * @return >=0 on success, negative error code on failure
5310 * @todo return the size in bytes required to store the samples in
5311 * case of success, at the next libavutil bump
5313 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5314 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5315 int buf_size, int align);
5318 * Reset the internal decoder state / flush internal buffers. Should be called
5319 * e.g. when seeking or when switching to a different stream.
5321 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5322 * this invalidates the frames previously returned from the decoder. When
5323 * refcounted frames are used, the decoder just releases any references it might
5324 * keep internally, but the caller's reference remains valid.
5326 void avcodec_flush_buffers(AVCodecContext *avctx);
5329 * Return codec bits per sample.
5331 * @param[in] codec_id the codec
5332 * @return Number of bits per sample or zero if unknown for the given codec.
5334 int av_get_bits_per_sample(enum AVCodecID codec_id);
5337 * Return the PCM codec associated with a sample format.
5338 * @param be endianness, 0 for little, 1 for big,
5339 * -1 (or anything else) for native
5340 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5342 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5345 * Return codec bits per sample.
5346 * Only return non-zero if the bits per sample is exactly correct, not an
5349 * @param[in] codec_id the codec
5350 * @return Number of bits per sample or zero if unknown for the given codec.
5352 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5355 * Return audio frame duration.
5357 * @param avctx codec context
5358 * @param frame_bytes size of the frame, or 0 if unknown
5359 * @return frame duration, in samples, if known. 0 if not able to
5362 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5365 typedef struct AVBitStreamFilterContext {
5367 struct AVBitStreamFilter *filter;
5368 AVCodecParserContext *parser;
5369 struct AVBitStreamFilterContext *next;
5370 } AVBitStreamFilterContext;
5373 typedef struct AVBitStreamFilter {
5376 int (*filter)(AVBitStreamFilterContext *bsfc,
5377 AVCodecContext *avctx, const char *args,
5378 uint8_t **poutbuf, int *poutbuf_size,
5379 const uint8_t *buf, int buf_size, int keyframe);
5380 void (*close)(AVBitStreamFilterContext *bsfc);
5381 struct AVBitStreamFilter *next;
5382 } AVBitStreamFilter;
5385 * Register a bitstream filter.
5387 * The filter will be accessible to the application code through
5388 * av_bitstream_filter_next() or can be directly initialized with
5389 * av_bitstream_filter_init().
5391 * @see avcodec_register_all()
5393 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5396 * Create and initialize a bitstream filter context given a bitstream
5399 * The returned context must be freed with av_bitstream_filter_close().
5401 * @param name the name of the bitstream filter
5402 * @return a bitstream filter context if a matching filter was found
5403 * and successfully initialized, NULL otherwise
5405 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5410 * This function filters the buffer buf with size buf_size, and places the
5411 * filtered buffer in the buffer pointed to by poutbuf.
5413 * The output buffer must be freed by the caller.
5415 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5416 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5417 * If specified, this must point to the encoder context of the
5418 * output stream the packet is sent to.
5419 * @param args arguments which specify the filter configuration, may be NULL
5420 * @param poutbuf pointer which is updated to point to the filtered buffer
5421 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5422 * @param buf buffer containing the data to filter
5423 * @param buf_size size in bytes of buf
5424 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5425 * @return >= 0 in case of success, or a negative error code in case of failure
5427 * If the return value is positive, an output buffer is allocated and
5428 * is available in *poutbuf, and is distinct from the input buffer.
5430 * If the return value is 0, the output buffer is not allocated and
5431 * should be considered identical to the input buffer, or in case
5432 * *poutbuf was set it points to the input buffer (not necessarily to
5433 * its starting address).
5435 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5436 AVCodecContext *avctx, const char *args,
5437 uint8_t **poutbuf, int *poutbuf_size,
5438 const uint8_t *buf, int buf_size, int keyframe);
5441 * Release bitstream filter context.
5443 * @param bsf the bitstream filter context created with
5444 * av_bitstream_filter_init(), can be NULL
5446 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5449 * If f is NULL, return the first registered bitstream filter,
5450 * if f is non-NULL, return the next registered bitstream filter
5451 * after f, or NULL if f is the last one.
5453 * This function can be used to iterate over all registered bitstream
5456 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5461 * Same behaviour av_fast_malloc but the buffer has additional
5462 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5464 * In addition the whole buffer will initially and after resizes
5465 * be 0-initialized so that no uninitialized data will ever appear.
5467 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5470 * Same behaviour av_fast_padded_malloc except that buffer will always
5471 * be 0-initialized after call.
5473 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5476 * Encode extradata length to a buffer. Used by xiph codecs.
5478 * @param s buffer to write to; must be at least (v/255+1) bytes long
5479 * @param v size of extradata in bytes
5480 * @return number of bytes written to the buffer.
5482 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5484 #if FF_API_MISSING_SAMPLE
5486 * Log a generic warning message about a missing feature. This function is
5487 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5488 * only, and would normally not be used by applications.
5489 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5490 * a pointer to an AVClass struct
5491 * @param[in] feature string containing the name of the missing feature
5492 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5493 * If want_sample is non-zero, additional verbage will be added to the log
5494 * message which tells the user how to report samples to the development
5496 * @deprecated Use avpriv_report_missing_feature() instead.
5498 attribute_deprecated
5499 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5502 * Log a generic warning message asking for a sample. This function is
5503 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5504 * only, and would normally not be used by applications.
5505 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5506 * a pointer to an AVClass struct
5507 * @param[in] msg string containing an optional message, or NULL if no message
5508 * @deprecated Use avpriv_request_sample() instead.
5510 attribute_deprecated
5511 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5512 #endif /* FF_API_MISSING_SAMPLE */
5515 * Register the hardware accelerator hwaccel.
5517 void av_register_hwaccel(AVHWAccel *hwaccel);
5520 * If hwaccel is NULL, returns the first registered hardware accelerator,
5521 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5522 * after hwaccel, or NULL if hwaccel is the last one.
5524 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5528 * Lock operation used by lockmgr
5531 AV_LOCK_CREATE, ///< Create a mutex
5532 AV_LOCK_OBTAIN, ///< Lock the mutex
5533 AV_LOCK_RELEASE, ///< Unlock the mutex
5534 AV_LOCK_DESTROY, ///< Free mutex resources
5538 * Register a user provided lock manager supporting the operations
5539 * specified by AVLockOp. The "mutex" argument to the function points
5540 * to a (void *) where the lockmgr should store/get a pointer to a user
5541 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5542 * value left by the last call for all other ops. If the lock manager is
5543 * unable to perform the op then it should leave the mutex in the same
5544 * state as when it was called and return a non-zero value. However,
5545 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5546 * have been successfully destroyed. If av_lockmgr_register succeeds
5547 * it will return a non-negative value, if it fails it will return a
5548 * negative value and destroy all mutex and unregister all callbacks.
5549 * av_lockmgr_register is not thread-safe, it must be called from a
5550 * single thread before any calls which make use of locking are used.
5552 * @param cb User defined callback. av_lockmgr_register invokes calls
5553 * to this callback and the previously registered callback.
5554 * The callback will be used to create more than one mutex
5555 * each of which must be backed by its own underlying locking
5556 * mechanism (i.e. do not use a single static object to
5557 * implement your lock manager). If cb is set to NULL the
5558 * lockmgr will be unregistered.
5560 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5563 * Get the type of the given codec.
5565 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5568 * Get the name of a codec.
5569 * @return a static string identifying the codec; never NULL
5571 const char *avcodec_get_name(enum AVCodecID id);
5574 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5575 * with no corresponding avcodec_close()), 0 otherwise.
5577 int avcodec_is_open(AVCodecContext *s);
5580 * @return a non-zero number if codec is an encoder, zero otherwise
5582 int av_codec_is_encoder(const AVCodec *codec);
5585 * @return a non-zero number if codec is a decoder, zero otherwise
5587 int av_codec_is_decoder(const AVCodec *codec);
5590 * @return descriptor for given codec ID or NULL if no descriptor exists.
5592 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5595 * Iterate over all codec descriptors known to libavcodec.
5597 * @param prev previous descriptor. NULL to get the first descriptor.
5599 * @return next descriptor or NULL after the last descriptor
5601 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5604 * @return codec descriptor with the given name or NULL if no such descriptor
5607 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5613 #endif /* AVCODEC_AVCODEC_H */