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
534 /* other specific kind of codecs (generally used for attachments) */
535 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
536 AV_CODEC_ID_TTF = 0x18000,
537 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
538 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
539 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
540 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
541 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
542 AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
543 AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'),
544 AV_CODEC_ID_BIN_DATA = MKBETAG('D','A','T','A'),
547 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
549 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
550 * stream (only used by libavformat) */
551 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
552 * stream (only used by libavformat) */
553 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
556 #include "old_codec_ids.h"
561 * This struct describes the properties of a single codec described by an
563 * @see avcodec_descriptor_get()
565 typedef struct AVCodecDescriptor {
567 enum AVMediaType type;
569 * Name of the codec described by this descriptor. It is non-empty and
570 * unique for each codec descriptor. It should contain alphanumeric
571 * characters and '_' only.
575 * A more descriptive name for this codec. May be NULL.
577 const char *long_name;
579 * Codec properties, a combination of AV_CODEC_PROP_* flags.
584 * MIME type(s) associated with the codec.
585 * May be NULL; if not, a NULL-terminated array of MIME types.
586 * The first item is always non-NULL and is the preferred MIME type.
588 const char *const *mime_types;
592 * Codec uses only intra compression.
595 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
597 * Codec supports lossy compression. Audio and video codecs only.
598 * @note a codec may support both lossy and lossless
601 #define AV_CODEC_PROP_LOSSY (1 << 1)
603 * Codec supports lossless compression. Audio and video codecs only.
605 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
607 * Codec supports frame reordering. That is, the coded order (the order in which
608 * the encoded packets are output by the encoders / stored / input to the
609 * decoders) may be different from the presentation order of the corresponding
612 * For codecs that do not have this property set, PTS and DTS should always be
615 #define AV_CODEC_PROP_REORDER (1 << 3)
617 * Subtitle codec is bitmap based
618 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
620 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
622 * Subtitle codec is text based.
623 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
625 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
628 * @ingroup lavc_decoding
629 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
630 * This is mainly needed because some optimized bitstream readers read
631 * 32 or 64 bit at once and could read over the end.<br>
632 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
633 * MPEG bitstreams could cause overread and segfault.
635 #define FF_INPUT_BUFFER_PADDING_SIZE 32
638 * @ingroup lavc_encoding
639 * minimum encoding buffer size
640 * Used to avoid some checks during header writing.
642 #define FF_MIN_BUFFER_SIZE 16384
646 * @ingroup lavc_encoding
647 * motion estimation type.
650 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
654 ME_EPZS, ///< enhanced predictive zonal search
655 ME_X1, ///< reserved for experiments
656 ME_HEX, ///< hexagon based search
657 ME_UMH, ///< uneven multi-hexagon search
658 ME_TESA, ///< transformed exhaustive search algorithm
659 ME_ITER=50, ///< iterative search
663 * @ingroup lavc_decoding
666 /* We leave some space between them for extensions (drop some
667 * keyframes for intra-only or drop just some bidir frames). */
668 AVDISCARD_NONE =-16, ///< discard nothing
669 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
670 AVDISCARD_NONREF = 8, ///< discard all non reference
671 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
672 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
673 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
674 AVDISCARD_ALL = 48, ///< discard all
677 enum AVAudioServiceType {
678 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
679 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
680 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
681 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
682 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
683 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
684 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
685 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
686 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
687 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
691 * @ingroup lavc_encoding
693 typedef struct RcOverride{
696 int qscale; // If this is 0 then quality_factor will be used instead.
697 float quality_factor;
700 #if FF_API_MAX_BFRAMES
702 * @deprecated there is no libavcodec-wide limit on the number of B-frames
704 #define FF_MAX_B_FRAMES 16
708 These flags can be passed in AVCodecContext.flags before initialization.
709 Note: Not everything is supported yet.
713 * Allow decoders to produce frames with data planes that are not aligned
714 * to CPU requirements (e.g. due to cropping).
716 #define CODEC_FLAG_UNALIGNED 0x0001
717 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
718 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
719 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
720 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
723 * @deprecated use the "gmc" private option of the libxvid encoder
725 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
729 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
732 #define CODEC_FLAG_MV0 0x0040
734 #if FF_API_INPUT_PRESERVED
736 * @deprecated passing reference-counted frames to the encoders replaces this
739 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
741 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
742 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
743 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
746 * @deprecated edges are not used/required anymore. I.e. this flag is now always
749 #define CODEC_FLAG_EMU_EDGE 0x4000
751 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
752 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
753 location instead of only at frame boundaries. */
754 #if FF_API_NORMALIZE_AQP
756 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
759 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
761 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
762 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
763 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
764 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
765 /* Fx : Flag for h263+ extra options */
766 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
767 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
768 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
769 #define CODEC_FLAG_CLOSED_GOP 0x80000000
770 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
771 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
772 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
773 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
774 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
776 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
777 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
778 #define CODEC_FLAG2_EXPORT_MVS 0x10000000 ///< Export motion vectors through frame side data
779 #define CODEC_FLAG2_SKIP_MANUAL 0x20000000 ///< Do not skip samples and export skip information as frame side data
781 /* Unsupported options :
782 * Syntax Arithmetic coding (SAC)
783 * Reference Picture Selection
784 * Independent Segment Decoding */
786 /* codec capabilities */
788 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
790 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
791 * If not set, it might not use get_buffer() at all or use operations that
792 * assume the buffer was allocated by avcodec_default_get_buffer.
794 #define CODEC_CAP_DR1 0x0002
795 #define CODEC_CAP_TRUNCATED 0x0008
797 /* Codec can export data for HW decoding. This flag indicates that
798 * the codec would call get_format() with list that might contain HW accelerated
799 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
800 * including raw image format.
801 * The application can use the passed context to determine bitstream version,
802 * chroma format, resolution etc.
804 #define CODEC_CAP_HWACCEL 0x0010
805 #endif /* FF_API_XVMC */
807 * Encoder or decoder requires flushing with NULL input at the end in order to
808 * give the complete and correct output.
810 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
811 * with NULL data. The user can still send NULL data to the public encode
812 * or decode function, but libavcodec will not pass it along to the codec
813 * unless this flag is set.
816 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
817 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
821 * The encoder needs to be fed with NULL data at the end of encoding until the
822 * encoder no longer returns data.
824 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
825 * flag also means that the encoder must set the pts and duration for
826 * each output packet. If this flag is not set, the pts and duration will
827 * be determined by libavcodec from the input frame.
829 #define CODEC_CAP_DELAY 0x0020
831 * Codec can be fed a final frame with a smaller size.
832 * This can be used to prevent truncation of the last audio samples.
834 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
837 * Codec can export data for HW decoding (VDPAU).
839 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
842 * Codec can output multiple frames per AVPacket
843 * Normally demuxers return one frame at a time, demuxers which do not do
844 * are connected to a parser to split what they return into proper frames.
845 * This flag is reserved to the very rare category of codecs which have a
846 * bitstream that cannot be split into frames without timeconsuming
847 * operations like full decoding. Demuxers carring such bitstreams thus
848 * may return multiple frames in a packet. This has many disadvantages like
849 * prohibiting stream copy in many cases thus it should only be considered
852 #define CODEC_CAP_SUBFRAMES 0x0100
854 * Codec is experimental and is thus avoided in favor of non experimental
857 #define CODEC_CAP_EXPERIMENTAL 0x0200
859 * Codec should fill in channel configuration and samplerate instead of container
861 #define CODEC_CAP_CHANNEL_CONF 0x0400
862 #if FF_API_NEG_LINESIZES
864 * @deprecated no codecs use this capability
866 #define CODEC_CAP_NEG_LINESIZES 0x0800
869 * Codec supports frame-level multithreading.
871 #define CODEC_CAP_FRAME_THREADS 0x1000
873 * Codec supports slice-based (or partition-based) multithreading.
875 #define CODEC_CAP_SLICE_THREADS 0x2000
877 * Codec supports changed parameters at any point.
879 #define CODEC_CAP_PARAM_CHANGE 0x4000
881 * Codec supports avctx->thread_count == 0 (auto).
883 #define CODEC_CAP_AUTO_THREADS 0x8000
885 * Audio encoder supports receiving a different number of samples in each call.
887 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
889 * Codec is intra only.
891 #define CODEC_CAP_INTRA_ONLY 0x40000000
895 #define CODEC_CAP_LOSSLESS 0x80000000
898 //The following defines may change, don't expect compatibility if you use them.
899 #define MB_TYPE_INTRA4x4 0x0001
900 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
901 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
902 #define MB_TYPE_16x16 0x0008
903 #define MB_TYPE_16x8 0x0010
904 #define MB_TYPE_8x16 0x0020
905 #define MB_TYPE_8x8 0x0040
906 #define MB_TYPE_INTERLACED 0x0080
907 #define MB_TYPE_DIRECT2 0x0100 //FIXME
908 #define MB_TYPE_ACPRED 0x0200
909 #define MB_TYPE_GMC 0x0400
910 #define MB_TYPE_SKIP 0x0800
911 #define MB_TYPE_P0L0 0x1000
912 #define MB_TYPE_P1L0 0x2000
913 #define MB_TYPE_P0L1 0x4000
914 #define MB_TYPE_P1L1 0x8000
915 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
916 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
917 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
918 #define MB_TYPE_QUANT 0x00010000
919 #define MB_TYPE_CBP 0x00020000
920 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
925 * This specifies the area which should be displayed.
926 * Note there may be multiple such areas for one frame.
928 typedef struct AVPanScan{
931 * - encoding: Set by user.
932 * - decoding: Set by libavcodec.
937 * width and height in 1/16 pel
938 * - encoding: Set by user.
939 * - decoding: Set by libavcodec.
945 * position of the top left corner in 1/16 pel for up to 3 fields/frames
946 * - encoding: Set by user.
947 * - decoding: Set by libavcodec.
949 int16_t position[3][2];
952 #if FF_API_QSCALE_TYPE
953 #define FF_QSCALE_TYPE_MPEG1 0
954 #define FF_QSCALE_TYPE_MPEG2 1
955 #define FF_QSCALE_TYPE_H264 2
956 #define FF_QSCALE_TYPE_VP56 3
959 #if FF_API_GET_BUFFER
960 #define FF_BUFFER_TYPE_INTERNAL 1
961 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
962 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
963 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
965 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
966 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
967 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
968 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
972 * The decoder will keep a reference to the frame and may reuse it later.
974 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
977 * @defgroup lavc_packet AVPacket
979 * Types and functions for working with AVPacket.
982 enum AVPacketSideDataType {
984 AV_PKT_DATA_NEW_EXTRADATA,
987 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
990 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
991 * s32le channel_count
992 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
993 * u64le channel_layout
994 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
996 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1001 AV_PKT_DATA_PARAM_CHANGE,
1004 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1005 * structures with info about macroblocks relevant to splitting the
1006 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1007 * That is, it does not necessarily contain info about all macroblocks,
1008 * as long as the distance between macroblocks in the info is smaller
1009 * than the target payload size.
1010 * Each MB info structure is 12 bytes, and is laid out as follows:
1012 * u32le bit offset from the start of the packet
1013 * u8 current quantizer at the start of the macroblock
1015 * u16le macroblock address within the GOB
1016 * u8 horizontal MV predictor
1017 * u8 vertical MV predictor
1018 * u8 horizontal MV predictor for block number 3
1019 * u8 vertical MV predictor for block number 3
1022 AV_PKT_DATA_H263_MB_INFO,
1025 * This side data should be associated with an audio stream and contains
1026 * ReplayGain information in form of the AVReplayGain struct.
1028 AV_PKT_DATA_REPLAYGAIN,
1031 * This side data contains a 3x3 transformation matrix describing an affine
1032 * transformation that needs to be applied to the decoded video frames for
1033 * correct presentation.
1035 * See libavutil/display.h for a detailed description of the data.
1037 AV_PKT_DATA_DISPLAYMATRIX,
1040 * This side data should be associated with a video stream and contains
1041 * Stereoscopic 3D information in form of the AVStereo3D struct.
1043 AV_PKT_DATA_STEREO3D,
1046 * This side data should be associated with an audio stream and corresponds
1047 * to enum AVAudioServiceType.
1049 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1052 * Recommmends skipping the specified number of samples
1054 * u32le number of samples to skip from start of this packet
1055 * u32le number of samples to skip from end of this packet
1056 * u8 reason for start skip
1057 * u8 reason for end skip (0=padding silence, 1=convergence)
1060 AV_PKT_DATA_SKIP_SAMPLES=70,
1063 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1064 * the packet may contain "dual mono" audio specific to Japanese DTV
1065 * and if it is true, recommends only the selected channel to be used.
1067 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1070 AV_PKT_DATA_JP_DUALMONO,
1073 * A list of zero terminated key/value strings. There is no end marker for
1074 * the list, so it is required to rely on the side data size to stop.
1076 AV_PKT_DATA_STRINGS_METADATA,
1079 * Subtitle event position
1087 AV_PKT_DATA_SUBTITLE_POSITION,
1090 * Data found in BlockAdditional element of matroska container. There is
1091 * no end marker for the data, so it is required to rely on the side data
1092 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1095 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1098 * The optional first identifier line of a WebVTT cue.
1100 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1103 * The optional settings (rendering instructions) that immediately
1104 * follow the timestamp specifier of a WebVTT cue.
1106 AV_PKT_DATA_WEBVTT_SETTINGS,
1109 * A list of zero terminated key/value strings. There is no end marker for
1110 * the list, so it is required to rely on the side data size to stop. This
1111 * side data includes updated metadata which appeared in the stream.
1113 AV_PKT_DATA_METADATA_UPDATE,
1116 typedef struct AVPacketSideData {
1119 enum AVPacketSideDataType type;
1123 * This structure stores compressed data. It is typically exported by demuxers
1124 * and then passed as input to decoders, or received as output from encoders and
1125 * then passed to muxers.
1127 * For video, it should typically contain one compressed frame. For audio it may
1128 * contain several compressed frames.
1130 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1131 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1132 * without libavcodec and libavformat major bump.
1134 * The semantics of data ownership depends on the buf or destruct (deprecated)
1135 * fields. If either is set, the packet data is dynamically allocated and is
1136 * valid indefinitely until av_free_packet() is called (which in turn calls
1137 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1138 * the packet data is typically backed by some static buffer somewhere and is
1139 * only valid for a limited time (e.g. until the next read call when demuxing).
1141 * The side data is always allocated with av_malloc() and is freed in
1144 typedef struct AVPacket {
1146 * A reference to the reference-counted buffer where the packet data is
1148 * May be NULL, then the packet data is not reference-counted.
1152 * Presentation timestamp in AVStream->time_base units; the time at which
1153 * the decompressed packet will be presented to the user.
1154 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1155 * pts MUST be larger or equal to dts as presentation cannot happen before
1156 * decompression, unless one wants to view hex dumps. Some formats misuse
1157 * the terms dts and pts/cts to mean something different. Such timestamps
1158 * must be converted to true pts/dts before they are stored in AVPacket.
1162 * Decompression timestamp in AVStream->time_base units; the time at which
1163 * the packet is decompressed.
1164 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1171 * A combination of AV_PKT_FLAG values
1175 * Additional packet data that can be provided by the container.
1176 * Packet can contain several types of side information.
1178 AVPacketSideData *side_data;
1179 int side_data_elems;
1182 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1183 * Equals next_pts - this_pts in presentation order.
1186 #if FF_API_DESTRUCT_PACKET
1187 attribute_deprecated
1188 void (*destruct)(struct AVPacket *);
1189 attribute_deprecated
1192 int64_t pos; ///< byte position in stream, -1 if unknown
1195 * Time difference in AVStream->time_base units from the pts of this
1196 * packet to the point at which the output from the decoder has converged
1197 * independent from the availability of previous frames. That is, the
1198 * frames are virtually identical no matter if decoding started from
1199 * the very first frame or from this keyframe.
1200 * Is AV_NOPTS_VALUE if unknown.
1201 * This field is not the display duration of the current packet.
1202 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1205 * The purpose of this field is to allow seeking in streams that have no
1206 * keyframes in the conventional sense. It corresponds to the
1207 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1208 * essential for some types of subtitle streams to ensure that all
1209 * subtitles are correctly displayed after seeking.
1211 int64_t convergence_duration;
1213 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1214 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1216 enum AVSideDataParamChangeFlags {
1217 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1218 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1219 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1220 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1226 struct AVCodecInternal;
1230 AV_FIELD_PROGRESSIVE,
1231 AV_FIELD_TT, //< Top coded_first, top displayed first
1232 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1233 AV_FIELD_TB, //< Top coded first, bottom displayed first
1234 AV_FIELD_BT, //< Bottom coded first, top displayed first
1238 * main external API structure.
1239 * New fields can be added to the end with minor version bumps.
1240 * Removal, reordering and changes to existing fields require a major
1242 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1244 * sizeof(AVCodecContext) must not be used outside libav*.
1246 typedef struct AVCodecContext {
1248 * information on struct for av_log
1249 * - set by avcodec_alloc_context3
1251 const AVClass *av_class;
1252 int log_level_offset;
1254 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1255 const struct AVCodec *codec;
1256 #if FF_API_CODEC_NAME
1258 * @deprecated this field is not used for anything in libavcodec
1260 attribute_deprecated
1261 char codec_name[32];
1263 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1266 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1267 * This is used to work around some encoder bugs.
1268 * A demuxer should set this to what is stored in the field used to identify the codec.
1269 * If there are multiple such fields in a container then the demuxer should choose the one
1270 * which maximizes the information about the used codec.
1271 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1272 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1273 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1275 * - encoding: Set by user, if not then the default based on codec_id will be used.
1276 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1278 unsigned int codec_tag;
1280 #if FF_API_STREAM_CODEC_TAG
1282 * @deprecated this field is unused
1284 attribute_deprecated
1285 unsigned int stream_codec_tag;
1291 * Private context used for internal data.
1293 * Unlike priv_data, this is not codec-specific. It is used in general
1294 * libavcodec functions.
1296 struct AVCodecInternal *internal;
1299 * Private data of the user, can be used to carry app specific stuff.
1300 * - encoding: Set by user.
1301 * - decoding: Set by user.
1306 * the average bitrate
1307 * - encoding: Set by user; unused for constant quantizer encoding.
1308 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1313 * number of bits the bitstream is allowed to diverge from the reference.
1314 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1315 * - encoding: Set by user; unused for constant quantizer encoding.
1316 * - decoding: unused
1318 int bit_rate_tolerance;
1321 * Global quality for codecs which cannot change it per frame.
1322 * This should be proportional to MPEG-1/2/4 qscale.
1323 * - encoding: Set by user.
1324 * - decoding: unused
1329 * - encoding: Set by user.
1330 * - decoding: unused
1332 int compression_level;
1333 #define FF_COMPRESSION_DEFAULT -1
1337 * - encoding: Set by user.
1338 * - decoding: Set by user.
1344 * - encoding: Set by user.
1345 * - decoding: Set by user.
1350 * some codecs need / can use extradata like Huffman tables.
1351 * mjpeg: Huffman tables
1352 * rv10: additional flags
1353 * mpeg4: global headers (they can be in the bitstream or here)
1354 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1355 * than extradata_size to avoid problems if it is read with the bitstream reader.
1356 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1357 * - encoding: Set/allocated/freed by libavcodec.
1358 * - decoding: Set/allocated/freed by user.
1364 * This is the fundamental unit of time (in seconds) in terms
1365 * of which frame timestamps are represented. For fixed-fps content,
1366 * timebase should be 1/framerate and timestamp increments should be
1368 * This often, but not always is the inverse of the frame rate or field rate
1370 * - encoding: MUST be set by user.
1371 * - decoding: the use of this field for decoding is deprecated.
1372 * Use framerate instead.
1374 AVRational time_base;
1377 * For some codecs, the time base is closer to the field rate than the frame rate.
1378 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1379 * if no telecine is used ...
1381 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1383 int ticks_per_frame;
1388 * Encoding: Number of frames delay there will be from the encoder input to
1389 * the decoder output. (we assume the decoder matches the spec)
1390 * Decoding: Number of frames delay in addition to what a standard decoder
1391 * as specified in the spec would produce.
1394 * Number of frames the decoded output will be delayed relative to the
1398 * For encoding, this field is unused (see initial_padding).
1400 * For decoding, this is the number of samples the decoder needs to
1401 * output before the decoder's output is valid. When seeking, you should
1402 * start decoding this many samples prior to your desired seek point.
1404 * - encoding: Set by libavcodec.
1405 * - decoding: Set by libavcodec.
1412 * picture width / height.
1414 * @note Those fields may not match the values of the last
1415 * AVFrame outputted by avcodec_decode_video2 due frame
1418 * - encoding: MUST be set by user.
1419 * - decoding: May be set by the user before opening the decoder if known e.g.
1420 * from the container. Some decoders will require the dimensions
1421 * to be set by the caller. During decoding, the decoder may
1422 * overwrite those values as required while parsing the data.
1427 * Bitstream width / height, may be different from width/height e.g. when
1428 * the decoded frame is cropped before being output or lowres is enabled.
1430 * @note Those field may not match the value of the last
1431 * AVFrame outputted by avcodec_decode_video2 due frame
1434 * - encoding: unused
1435 * - decoding: May be set by the user before opening the decoder if known
1436 * e.g. from the container. During decoding, the decoder may
1437 * overwrite those values as required while parsing the data.
1439 int coded_width, coded_height;
1441 #if FF_API_ASPECT_EXTENDED
1442 #define FF_ASPECT_EXTENDED 15
1446 * the number of pictures in a group of pictures, or 0 for intra_only
1447 * - encoding: Set by user.
1448 * - decoding: unused
1453 * Pixel format, see AV_PIX_FMT_xxx.
1454 * May be set by the demuxer if known from headers.
1455 * May be overridden by the decoder if it knows better.
1457 * @note This field may not match the value of the last
1458 * AVFrame outputted by avcodec_decode_video2 due frame
1461 * - encoding: Set by user.
1462 * - decoding: Set by user if known, overridden by libavcodec while
1465 enum AVPixelFormat pix_fmt;
1468 * Motion estimation algorithm used for video coding.
1469 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1470 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1471 * - encoding: MUST be set by user.
1472 * - decoding: unused
1477 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1478 * decoder to draw a horizontal band. It improves cache usage. Not
1479 * all codecs can do that. You must check the codec capabilities
1481 * When multithreading is used, it may be called from multiple threads
1482 * at the same time; threads might draw different parts of the same AVFrame,
1483 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1485 * The function is also used by hardware acceleration APIs.
1486 * It is called at least once during frame decoding to pass
1487 * the data needed for hardware render.
1488 * In that mode instead of pixel data, AVFrame points to
1489 * a structure specific to the acceleration API. The application
1490 * reads the structure and can change some fields to indicate progress
1492 * - encoding: unused
1493 * - decoding: Set by user.
1494 * @param height the height of the slice
1495 * @param y the y position of the slice
1496 * @param type 1->top field, 2->bottom field, 3->frame
1497 * @param offset offset into the AVFrame.data from which the slice should be read
1499 void (*draw_horiz_band)(struct AVCodecContext *s,
1500 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1501 int y, int type, int height);
1504 * callback to negotiate the pixelFormat
1505 * @param fmt is the list of formats which are supported by the codec,
1506 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1507 * The first is always the native one.
1508 * @note The callback may be called again immediately if initialization for
1509 * the selected (hardware-accelerated) pixel format failed.
1510 * @warning Behavior is undefined if the callback returns a value not
1511 * in the fmt list of formats.
1512 * @return the chosen format
1513 * - encoding: unused
1514 * - decoding: Set by user, if not set the native format will be chosen.
1516 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1519 * maximum number of B-frames between non-B-frames
1520 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1521 * - encoding: Set by user.
1522 * - decoding: unused
1527 * qscale factor between IP and B-frames
1528 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1529 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1530 * - encoding: Set by user.
1531 * - decoding: unused
1533 float b_quant_factor;
1535 /** obsolete FIXME remove */
1537 #define FF_RC_STRATEGY_XVID 1
1539 int b_frame_strategy;
1542 * qscale offset between IP and B-frames
1543 * - encoding: Set by user.
1544 * - decoding: unused
1546 float b_quant_offset;
1549 * Size of the frame reordering buffer in the decoder.
1550 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1551 * - encoding: Set by libavcodec.
1552 * - decoding: Set by libavcodec.
1557 * 0-> h263 quant 1-> mpeg quant
1558 * - encoding: Set by user.
1559 * - decoding: unused
1564 * qscale factor between P and I-frames
1565 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1566 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1567 * - encoding: Set by user.
1568 * - decoding: unused
1570 float i_quant_factor;
1573 * qscale offset between P and I-frames
1574 * - encoding: Set by user.
1575 * - decoding: unused
1577 float i_quant_offset;
1580 * luminance masking (0-> disabled)
1581 * - encoding: Set by user.
1582 * - decoding: unused
1587 * temporary complexity masking (0-> disabled)
1588 * - encoding: Set by user.
1589 * - decoding: unused
1591 float temporal_cplx_masking;
1594 * spatial complexity masking (0-> disabled)
1595 * - encoding: Set by user.
1596 * - decoding: unused
1598 float spatial_cplx_masking;
1601 * p block masking (0-> disabled)
1602 * - encoding: Set by user.
1603 * - decoding: unused
1608 * darkness masking (0-> disabled)
1609 * - encoding: Set by user.
1610 * - decoding: unused
1616 * - encoding: Set by libavcodec.
1617 * - decoding: Set by user (or 0).
1621 * prediction method (needed for huffyuv)
1622 * - encoding: Set by user.
1623 * - decoding: unused
1625 int prediction_method;
1626 #define FF_PRED_LEFT 0
1627 #define FF_PRED_PLANE 1
1628 #define FF_PRED_MEDIAN 2
1631 * slice offsets in the frame in bytes
1632 * - encoding: Set/allocated by libavcodec.
1633 * - decoding: Set/allocated by user (or NULL).
1638 * sample aspect ratio (0 if unknown)
1639 * That is the width of a pixel divided by the height of the pixel.
1640 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1641 * - encoding: Set by user.
1642 * - decoding: Set by libavcodec.
1644 AVRational sample_aspect_ratio;
1647 * motion estimation comparison function
1648 * - encoding: Set by user.
1649 * - decoding: unused
1653 * subpixel motion estimation comparison function
1654 * - encoding: Set by user.
1655 * - decoding: unused
1659 * macroblock comparison function (not supported yet)
1660 * - encoding: Set by user.
1661 * - decoding: unused
1665 * interlaced DCT comparison function
1666 * - encoding: Set by user.
1667 * - decoding: unused
1670 #define FF_CMP_SAD 0
1671 #define FF_CMP_SSE 1
1672 #define FF_CMP_SATD 2
1673 #define FF_CMP_DCT 3
1674 #define FF_CMP_PSNR 4
1675 #define FF_CMP_BIT 5
1677 #define FF_CMP_ZERO 7
1678 #define FF_CMP_VSAD 8
1679 #define FF_CMP_VSSE 9
1680 #define FF_CMP_NSSE 10
1681 #define FF_CMP_W53 11
1682 #define FF_CMP_W97 12
1683 #define FF_CMP_DCTMAX 13
1684 #define FF_CMP_DCT264 14
1685 #define FF_CMP_CHROMA 256
1688 * ME diamond size & shape
1689 * - encoding: Set by user.
1690 * - decoding: unused
1695 * amount of previous MV predictors (2a+1 x 2a+1 square)
1696 * - encoding: Set by user.
1697 * - decoding: unused
1699 int last_predictor_count;
1702 * prepass for motion estimation
1703 * - encoding: Set by user.
1704 * - decoding: unused
1709 * motion estimation prepass comparison function
1710 * - encoding: Set by user.
1711 * - decoding: unused
1716 * ME prepass diamond size & shape
1717 * - encoding: Set by user.
1718 * - decoding: unused
1724 * - encoding: Set by user.
1725 * - decoding: unused
1727 int me_subpel_quality;
1731 * DTG active format information (additional aspect ratio
1732 * information only used in DVB MPEG-2 transport streams)
1735 * - encoding: unused
1736 * - decoding: Set by decoder.
1737 * @deprecated Deprecated in favor of AVSideData
1739 attribute_deprecated int dtg_active_format;
1740 #define FF_DTG_AFD_SAME 8
1741 #define FF_DTG_AFD_4_3 9
1742 #define FF_DTG_AFD_16_9 10
1743 #define FF_DTG_AFD_14_9 11
1744 #define FF_DTG_AFD_4_3_SP_14_9 13
1745 #define FF_DTG_AFD_16_9_SP_14_9 14
1746 #define FF_DTG_AFD_SP_4_3 15
1747 #endif /* FF_API_AFD */
1750 * maximum motion estimation search range in subpel units
1751 * If 0 then no limit.
1753 * - encoding: Set by user.
1754 * - decoding: unused
1759 * intra quantizer bias
1760 * - encoding: Set by user.
1761 * - decoding: unused
1763 int intra_quant_bias;
1764 #define FF_DEFAULT_QUANT_BIAS 999999
1767 * inter quantizer bias
1768 * - encoding: Set by user.
1769 * - decoding: unused
1771 int inter_quant_bias;
1775 * - encoding: unused
1776 * - decoding: Set by user.
1779 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1780 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1781 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1785 * XVideo Motion Acceleration
1786 * - encoding: forbidden
1787 * - decoding: set by decoder
1788 * @deprecated XvMC doesn't need it anymore.
1790 attribute_deprecated int xvmc_acceleration;
1791 #endif /* FF_API_XVMC */
1794 * macroblock decision mode
1795 * - encoding: Set by user.
1796 * - decoding: unused
1799 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1800 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1801 #define FF_MB_DECISION_RD 2 ///< rate distortion
1804 * custom intra quantization matrix
1805 * - encoding: Set by user, can be NULL.
1806 * - decoding: Set by libavcodec.
1808 uint16_t *intra_matrix;
1811 * custom inter quantization matrix
1812 * - encoding: Set by user, can be NULL.
1813 * - decoding: Set by libavcodec.
1815 uint16_t *inter_matrix;
1818 * scene change detection threshold
1819 * 0 is default, larger means fewer detected scene changes.
1820 * - encoding: Set by user.
1821 * - decoding: unused
1823 int scenechange_threshold;
1826 * noise reduction strength
1827 * - encoding: Set by user.
1828 * - decoding: unused
1830 int noise_reduction;
1834 * @deprecated this field is unused
1836 attribute_deprecated
1840 * @deprecated this field is unused
1842 attribute_deprecated
1847 * precision of the intra DC coefficient - 8
1848 * - encoding: Set by user.
1849 * - decoding: Set by libavcodec
1851 int intra_dc_precision;
1854 * Number of macroblock rows at the top which are skipped.
1855 * - encoding: unused
1856 * - decoding: Set by user.
1861 * Number of macroblock rows at the bottom which are skipped.
1862 * - encoding: unused
1863 * - decoding: Set by user.
1869 * @deprecated use encoder private options instead
1871 attribute_deprecated
1872 float border_masking;
1876 * minimum MB lagrange multipler
1877 * - encoding: Set by user.
1878 * - decoding: unused
1883 * maximum MB lagrange multipler
1884 * - encoding: Set by user.
1885 * - decoding: unused
1891 * - encoding: Set by user.
1892 * - decoding: unused
1894 int me_penalty_compensation;
1898 * - encoding: Set by user.
1899 * - decoding: unused
1905 * - encoding: Set by user.
1906 * - decoding: unused
1912 * - encoding: Set by user.
1913 * - decoding: unused
1918 * number of reference frames
1919 * - encoding: Set by user.
1920 * - decoding: Set by lavc.
1925 * chroma qp offset from luma
1926 * - encoding: Set by user.
1927 * - decoding: unused
1931 #if FF_API_UNUSED_MEMBERS
1933 * Multiplied by qscale for each frame and added to scene_change_score.
1934 * - encoding: Set by user.
1935 * - decoding: unused
1937 attribute_deprecated int scenechange_factor;
1942 * Note: Value depends upon the compare function used for fullpel ME.
1943 * - encoding: Set by user.
1944 * - decoding: unused
1949 * Adjust sensitivity of b_frame_strategy 1.
1950 * - encoding: Set by user.
1951 * - decoding: unused
1956 * Chromaticity coordinates of the source primaries.
1957 * - encoding: Set by user
1958 * - decoding: Set by libavcodec
1960 enum AVColorPrimaries color_primaries;
1963 * Color Transfer Characteristic.
1964 * - encoding: Set by user
1965 * - decoding: Set by libavcodec
1967 enum AVColorTransferCharacteristic color_trc;
1970 * YUV colorspace type.
1971 * - encoding: Set by user
1972 * - decoding: Set by libavcodec
1974 enum AVColorSpace colorspace;
1977 * MPEG vs JPEG YUV range.
1978 * - encoding: Set by user
1979 * - decoding: Set by libavcodec
1981 enum AVColorRange color_range;
1984 * This defines the location of chroma samples.
1985 * - encoding: Set by user
1986 * - decoding: Set by libavcodec
1988 enum AVChromaLocation chroma_sample_location;
1992 * Indicates number of picture subdivisions. Used for parallelized
1994 * - encoding: Set by user
1995 * - decoding: unused
2000 * - encoding: set by libavcodec
2001 * - decoding: Set by user.
2003 enum AVFieldOrder field_order;
2006 int sample_rate; ///< samples per second
2007 int channels; ///< number of audio channels
2010 * audio sample format
2011 * - encoding: Set by user.
2012 * - decoding: Set by libavcodec.
2014 enum AVSampleFormat sample_fmt; ///< sample format
2016 /* The following data should not be initialized. */
2018 * Number of samples per channel in an audio frame.
2020 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2021 * except the last must contain exactly frame_size samples per channel.
2022 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2023 * frame size is not restricted.
2024 * - decoding: may be set by some decoders to indicate constant frame size
2029 * Frame counter, set by libavcodec.
2031 * - decoding: total number of frames returned from the decoder so far.
2032 * - encoding: total number of frames passed to the encoder so far.
2034 * @note the counter is not incremented if encoding/decoding resulted in
2040 * number of bytes per packet if constant and known or 0
2041 * Used by some WAV based audio codecs.
2046 * Audio cutoff bandwidth (0 means "automatic")
2047 * - encoding: Set by user.
2048 * - decoding: unused
2052 #if FF_API_REQUEST_CHANNELS
2054 * Decoder should decode to this many channels if it can (0 for default)
2055 * - encoding: unused
2056 * - decoding: Set by user.
2057 * @deprecated Deprecated in favor of request_channel_layout.
2059 attribute_deprecated int request_channels;
2063 * Audio channel layout.
2064 * - encoding: set by user.
2065 * - decoding: set by user, may be overwritten by libavcodec.
2067 uint64_t channel_layout;
2070 * Request decoder to use this channel layout if it can (0 for default)
2071 * - encoding: unused
2072 * - decoding: Set by user.
2074 uint64_t request_channel_layout;
2077 * Type of service that the audio stream conveys.
2078 * - encoding: Set by user.
2079 * - decoding: Set by libavcodec.
2081 enum AVAudioServiceType audio_service_type;
2084 * desired sample format
2085 * - encoding: Not used.
2086 * - decoding: Set by user.
2087 * Decoder will decode to this format if it can.
2089 enum AVSampleFormat request_sample_fmt;
2091 #if FF_API_GET_BUFFER
2093 * Called at the beginning of each frame to get a buffer for it.
2095 * The function will set AVFrame.data[], AVFrame.linesize[].
2096 * AVFrame.extended_data[] must also be set, but it should be the same as
2097 * AVFrame.data[] except for planar audio with more channels than can fit
2098 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2099 * many data pointers as it can hold.
2101 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2102 * avcodec_default_get_buffer() instead of providing buffers allocated by
2105 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2106 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2107 * but if get_buffer() is overridden then alignment considerations should
2108 * be taken into account.
2110 * @see avcodec_default_get_buffer()
2114 * If pic.reference is set then the frame will be read later by libavcodec.
2115 * avcodec_align_dimensions2() should be used to find the required width and
2116 * height, as they normally need to be rounded up to the next multiple of 16.
2118 * If frame multithreading is used and thread_safe_callbacks is set,
2119 * it may be called from a different thread, but not from more than one at
2120 * once. Does not need to be reentrant.
2122 * @see release_buffer(), reget_buffer()
2123 * @see avcodec_align_dimensions2()
2127 * Decoders request a buffer of a particular size by setting
2128 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2129 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2130 * to a smaller value in the output frame.
2132 * Decoders cannot use the buffer after returning from
2133 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2134 * is assumed to be released immediately upon return. In some rare cases,
2135 * a decoder may need to call get_buffer() more than once in a single
2136 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2137 * called again after it has already been called once, the previously
2138 * acquired buffer is assumed to be released at that time and may not be
2139 * reused by the decoder.
2141 * As a convenience, av_samples_get_buffer_size() and
2142 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2143 * functions to find the required data size and to fill data pointers and
2144 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2145 * since all planes must be the same size.
2147 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2149 * - encoding: unused
2150 * - decoding: Set by libavcodec, user can override.
2152 * @deprecated use get_buffer2()
2154 attribute_deprecated
2155 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2158 * Called to release buffers which were allocated with get_buffer.
2159 * A released buffer can be reused in get_buffer().
2160 * pic.data[*] must be set to NULL.
2161 * May be called from a different thread if frame multithreading is used,
2162 * but not by more than one thread at once, so does not need to be reentrant.
2163 * - encoding: unused
2164 * - decoding: Set by libavcodec, user can override.
2166 * @deprecated custom freeing callbacks should be set from get_buffer2()
2168 attribute_deprecated
2169 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2172 * Called at the beginning of a frame to get cr buffer for it.
2173 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2174 * libavcodec will pass previous buffer in pic, function should return
2175 * same buffer or new buffer with old frame "painted" into it.
2176 * If pic.data[0] == NULL must behave like get_buffer().
2177 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2178 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2180 * - encoding: unused
2181 * - decoding: Set by libavcodec, user can override.
2183 attribute_deprecated
2184 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2188 * This callback is called at the beginning of each frame to get data
2189 * buffer(s) for it. There may be one contiguous buffer for all the data or
2190 * there may be a buffer per each data plane or anything in between. What
2191 * this means is, you may set however many entries in buf[] you feel necessary.
2192 * Each buffer must be reference-counted using the AVBuffer API (see description
2195 * The following fields will be set in the frame before this callback is
2198 * - width, height (video only)
2199 * - sample_rate, channel_layout, nb_samples (audio only)
2200 * Their values may differ from the corresponding values in
2201 * AVCodecContext. This callback must use the frame values, not the codec
2202 * context values, to calculate the required buffer size.
2204 * This callback must fill the following fields in the frame:
2208 * * if the data is planar audio with more than 8 channels, then this
2209 * callback must allocate and fill extended_data to contain all pointers
2210 * to all data planes. data[] must hold as many pointers as it can.
2211 * extended_data must be allocated with av_malloc() and will be freed in
2213 * * otherwise exended_data must point to data
2214 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2215 * the frame's data and extended_data pointers must be contained in these. That
2216 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2217 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2218 * and av_buffer_ref().
2219 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2220 * this callback and filled with the extra buffers if there are more
2221 * buffers than buf[] can hold. extended_buf will be freed in
2224 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2225 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2228 * Each data plane must be aligned to the maximum required by the target
2231 * @see avcodec_default_get_buffer2()
2235 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2236 * (read and/or written to if it is writable) later by libavcodec.
2238 * avcodec_align_dimensions2() should be used to find the required width and
2239 * height, as they normally need to be rounded up to the next multiple of 16.
2241 * Some decoders do not support linesizes changing between frames.
2243 * If frame multithreading is used and thread_safe_callbacks is set,
2244 * this callback may be called from a different thread, but not from more
2245 * than one at once. Does not need to be reentrant.
2247 * @see avcodec_align_dimensions2()
2251 * Decoders request a buffer of a particular size by setting
2252 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2253 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2254 * to a smaller value in the output frame.
2256 * As a convenience, av_samples_get_buffer_size() and
2257 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2258 * functions to find the required data size and to fill data pointers and
2259 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2260 * since all planes must be the same size.
2262 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2264 * - encoding: unused
2265 * - decoding: Set by libavcodec, user can override.
2267 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2270 * If non-zero, the decoded audio and video frames returned from
2271 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2272 * and are valid indefinitely. The caller must free them with
2273 * av_frame_unref() when they are not needed anymore.
2274 * Otherwise, the decoded frames must not be freed by the caller and are
2275 * only valid until the next decode call.
2277 * - encoding: unused
2278 * - decoding: set by the caller before avcodec_open2().
2280 int refcounted_frames;
2282 /* - encoding parameters */
2283 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2284 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2288 * - encoding: Set by user.
2289 * - decoding: unused
2295 * - encoding: Set by user.
2296 * - decoding: unused
2301 * maximum quantizer difference between frames
2302 * - encoding: Set by user.
2303 * - decoding: unused
2309 * @deprecated use encoder private options instead
2311 attribute_deprecated
2314 attribute_deprecated
2316 attribute_deprecated
2321 * decoder bitstream buffer size
2322 * - encoding: Set by user.
2323 * - decoding: unused
2328 * ratecontrol override, see RcOverride
2329 * - encoding: Allocated/set/freed by user.
2330 * - decoding: unused
2332 int rc_override_count;
2333 RcOverride *rc_override;
2337 * @deprecated use encoder private options instead
2339 attribute_deprecated
2345 * - encoding: Set by user.
2346 * - decoding: Set by libavcodec.
2352 * - encoding: Set by user.
2353 * - decoding: unused
2359 * @deprecated use encoder private options instead
2361 attribute_deprecated
2362 float rc_buffer_aggressivity;
2364 attribute_deprecated
2365 float rc_initial_cplx;
2369 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2370 * - encoding: Set by user.
2371 * - decoding: unused.
2373 float rc_max_available_vbv_use;
2376 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2377 * - encoding: Set by user.
2378 * - decoding: unused.
2380 float rc_min_vbv_overflow_use;
2383 * Number of bits which should be loaded into the rc buffer before decoding starts.
2384 * - encoding: Set by user.
2385 * - decoding: unused
2387 int rc_initial_buffer_occupancy;
2389 #define FF_CODER_TYPE_VLC 0
2390 #define FF_CODER_TYPE_AC 1
2391 #define FF_CODER_TYPE_RAW 2
2392 #define FF_CODER_TYPE_RLE 3
2393 #if FF_API_UNUSED_MEMBERS
2394 #define FF_CODER_TYPE_DEFLATE 4
2395 #endif /* FF_API_UNUSED_MEMBERS */
2398 * - encoding: Set by user.
2399 * - decoding: unused
2405 * - encoding: Set by user.
2406 * - decoding: unused
2412 * @deprecated use encoder private options instead
2414 attribute_deprecated
2418 * @deprecated use encoder private options instead
2420 attribute_deprecated
2425 * frame skip threshold
2426 * - encoding: Set by user.
2427 * - decoding: unused
2429 int frame_skip_threshold;
2433 * - encoding: Set by user.
2434 * - decoding: unused
2436 int frame_skip_factor;
2439 * frame skip exponent
2440 * - encoding: Set by user.
2441 * - decoding: unused
2446 * frame skip comparison function
2447 * - encoding: Set by user.
2448 * - decoding: unused
2453 * trellis RD quantization
2454 * - encoding: Set by user.
2455 * - decoding: unused
2460 * - encoding: Set by user.
2461 * - decoding: unused
2463 int min_prediction_order;
2466 * - encoding: Set by user.
2467 * - decoding: unused
2469 int max_prediction_order;
2472 * GOP timecode frame start number
2473 * - encoding: Set by user, in non drop frame format
2474 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2476 int64_t timecode_frame_start;
2478 /* The RTP callback: This function is called */
2479 /* every time the encoder has a packet to send. */
2480 /* It depends on the encoder if the data starts */
2481 /* with a Start Code (it should). H.263 does. */
2482 /* mb_nb contains the number of macroblocks */
2483 /* encoded in the RTP payload. */
2484 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2486 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2487 /* do its best to deliver a chunk with size */
2488 /* below rtp_payload_size, the chunk will start */
2489 /* with a start code on some codecs like H.263. */
2490 /* This doesn't take account of any particular */
2491 /* headers inside the transmitted RTP payload. */
2493 /* statistics, used for 2-pass encoding */
2504 * number of bits used for the previously encoded frame
2505 * - encoding: Set by libavcodec.
2506 * - decoding: unused
2511 * pass1 encoding statistics output buffer
2512 * - encoding: Set by libavcodec.
2513 * - decoding: unused
2518 * pass2 encoding statistics input buffer
2519 * Concatenated stuff from stats_out of pass1 should be placed here.
2520 * - encoding: Allocated/set/freed by user.
2521 * - decoding: unused
2526 * Work around bugs in encoders which sometimes cannot be detected automatically.
2527 * - encoding: Set by user
2528 * - decoding: Set by user
2530 int workaround_bugs;
2531 #define FF_BUG_AUTODETECT 1 ///< autodetection
2532 #if FF_API_OLD_MSMPEG4
2533 #define FF_BUG_OLD_MSMPEG4 2
2535 #define FF_BUG_XVID_ILACE 4
2536 #define FF_BUG_UMP4 8
2537 #define FF_BUG_NO_PADDING 16
2538 #define FF_BUG_AMV 32
2540 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2542 #define FF_BUG_QPEL_CHROMA 64
2543 #define FF_BUG_STD_QPEL 128
2544 #define FF_BUG_QPEL_CHROMA2 256
2545 #define FF_BUG_DIRECT_BLOCKSIZE 512
2546 #define FF_BUG_EDGE 1024
2547 #define FF_BUG_HPEL_CHROMA 2048
2548 #define FF_BUG_DC_CLIP 4096
2549 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2550 #define FF_BUG_TRUNCATED 16384
2553 * strictly follow the standard (MPEG4, ...).
2554 * - encoding: Set by user.
2555 * - decoding: Set by user.
2556 * Setting this to STRICT or higher means the encoder and decoder will
2557 * generally do stupid things, whereas setting it to unofficial or lower
2558 * will mean the encoder might produce output that is not supported by all
2559 * spec-compliant decoders. Decoders don't differentiate between normal,
2560 * unofficial and experimental (that is, they always try to decode things
2561 * when they can) unless they are explicitly asked to behave stupidly
2562 * (=strictly conform to the specs)
2564 int strict_std_compliance;
2565 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2566 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2567 #define FF_COMPLIANCE_NORMAL 0
2568 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2569 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2572 * error concealment flags
2573 * - encoding: unused
2574 * - decoding: Set by user.
2576 int error_concealment;
2577 #define FF_EC_GUESS_MVS 1
2578 #define FF_EC_DEBLOCK 2
2579 #define FF_EC_FAVOR_INTER 256
2583 * - encoding: Set by user.
2584 * - decoding: Set by user.
2587 #define FF_DEBUG_PICT_INFO 1
2588 #define FF_DEBUG_RC 2
2589 #define FF_DEBUG_BITSTREAM 4
2590 #define FF_DEBUG_MB_TYPE 8
2591 #define FF_DEBUG_QP 16
2594 * @deprecated this option does nothing
2596 #define FF_DEBUG_MV 32
2598 #define FF_DEBUG_DCT_COEFF 0x00000040
2599 #define FF_DEBUG_SKIP 0x00000080
2600 #define FF_DEBUG_STARTCODE 0x00000100
2601 #if FF_API_UNUSED_MEMBERS
2602 #define FF_DEBUG_PTS 0x00000200
2603 #endif /* FF_API_UNUSED_MEMBERS */
2604 #define FF_DEBUG_ER 0x00000400
2605 #define FF_DEBUG_MMCO 0x00000800
2606 #define FF_DEBUG_BUGS 0x00001000
2608 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2609 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2611 #define FF_DEBUG_BUFFERS 0x00008000
2612 #define FF_DEBUG_THREADS 0x00010000
2613 #define FF_DEBUG_NOMC 0x01000000
2618 * Code outside libavcodec should access this field using AVOptions
2619 * - encoding: Set by user.
2620 * - decoding: Set by user.
2623 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2624 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2625 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2629 * Error recognition; may misdetect some more or less valid parts as errors.
2630 * - encoding: unused
2631 * - decoding: Set by user.
2633 int err_recognition;
2636 * Verify checksums embedded in the bitstream (could be of either encoded or
2637 * decoded data, depending on the codec) and print an error message on mismatch.
2638 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2639 * decoder returning an error.
2641 #define AV_EF_CRCCHECK (1<<0)
2642 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2643 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2644 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2646 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2647 #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
2648 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2649 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2653 * opaque 64bit number (generally a PTS) that will be reordered and
2654 * output in AVFrame.reordered_opaque
2655 * - encoding: unused
2656 * - decoding: Set by user.
2658 int64_t reordered_opaque;
2661 * Hardware accelerator in use
2662 * - encoding: unused.
2663 * - decoding: Set by libavcodec
2665 struct AVHWAccel *hwaccel;
2668 * Hardware accelerator context.
2669 * For some hardware accelerators, a global context needs to be
2670 * provided by the user. In that case, this holds display-dependent
2671 * data FFmpeg cannot instantiate itself. Please refer to the
2672 * FFmpeg HW accelerator documentation to know how to fill this
2673 * is. e.g. for VA API, this is a struct vaapi_context.
2674 * - encoding: unused
2675 * - decoding: Set by user
2677 void *hwaccel_context;
2681 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2682 * - decoding: unused
2684 uint64_t error[AV_NUM_DATA_POINTERS];
2687 * DCT algorithm, see FF_DCT_* below
2688 * - encoding: Set by user.
2689 * - decoding: unused
2692 #define FF_DCT_AUTO 0
2693 #define FF_DCT_FASTINT 1
2694 #if FF_API_UNUSED_MEMBERS
2695 #define FF_DCT_INT 2
2696 #endif /* FF_API_UNUSED_MEMBERS */
2697 #define FF_DCT_MMX 3
2698 #define FF_DCT_ALTIVEC 5
2699 #define FF_DCT_FAAN 6
2702 * IDCT algorithm, see FF_IDCT_* below.
2703 * - encoding: Set by user.
2704 * - decoding: Set by user.
2707 #define FF_IDCT_AUTO 0
2708 #define FF_IDCT_INT 1
2709 #define FF_IDCT_SIMPLE 2
2710 #define FF_IDCT_SIMPLEMMX 3
2711 #define FF_IDCT_ARM 7
2712 #define FF_IDCT_ALTIVEC 8
2714 #define FF_IDCT_SH4 9
2716 #define FF_IDCT_SIMPLEARM 10
2717 #if FF_API_UNUSED_MEMBERS
2718 #define FF_IDCT_IPP 13
2719 #endif /* FF_API_UNUSED_MEMBERS */
2720 #define FF_IDCT_XVID 14
2721 #if FF_API_IDCT_XVIDMMX
2722 #define FF_IDCT_XVIDMMX 14
2723 #endif /* FF_API_IDCT_XVIDMMX */
2724 #define FF_IDCT_SIMPLEARMV5TE 16
2725 #define FF_IDCT_SIMPLEARMV6 17
2726 #if FF_API_ARCH_SPARC
2727 #define FF_IDCT_SIMPLEVIS 18
2729 #define FF_IDCT_FAAN 20
2730 #define FF_IDCT_SIMPLENEON 22
2731 #if FF_API_ARCH_ALPHA
2732 #define FF_IDCT_SIMPLEALPHA 23
2734 #define FF_IDCT_SIMPLEAUTO 128
2737 * bits per sample/pixel from the demuxer (needed for huffyuv).
2738 * - encoding: Set by libavcodec.
2739 * - decoding: Set by user.
2741 int bits_per_coded_sample;
2744 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2745 * - encoding: set by user.
2746 * - decoding: set by libavcodec.
2748 int bits_per_raw_sample;
2752 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2753 * - encoding: unused
2754 * - decoding: Set by user.
2755 * Code outside libavcodec should access this field using:
2756 * av_codec_{get,set}_lowres(avctx)
2762 * the picture in the bitstream
2763 * - encoding: Set by libavcodec.
2764 * - decoding: unused
2766 AVFrame *coded_frame;
2770 * is used to decide how many independent tasks should be passed to execute()
2771 * - encoding: Set by user.
2772 * - decoding: Set by user.
2777 * Which multithreading methods to use.
2778 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2779 * so clients which cannot provide future frames should not use it.
2781 * - encoding: Set by user, otherwise the default is used.
2782 * - decoding: Set by user, otherwise the default is used.
2785 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2786 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2789 * Which multithreading methods are in use by the codec.
2790 * - encoding: Set by libavcodec.
2791 * - decoding: Set by libavcodec.
2793 int active_thread_type;
2796 * Set by the client if its custom get_buffer() callback can be called
2797 * synchronously from another thread, which allows faster multithreaded decoding.
2798 * draw_horiz_band() will be called from other threads regardless of this setting.
2799 * Ignored if the default get_buffer() is used.
2800 * - encoding: Set by user.
2801 * - decoding: Set by user.
2803 int thread_safe_callbacks;
2806 * The codec may call this to execute several independent things.
2807 * It will return only after finishing all tasks.
2808 * The user may replace this with some multithreaded implementation,
2809 * the default implementation will execute the parts serially.
2810 * @param count the number of things to execute
2811 * - encoding: Set by libavcodec, user can override.
2812 * - decoding: Set by libavcodec, user can override.
2814 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2817 * The codec may call this to execute several independent things.
2818 * It will return only after finishing all tasks.
2819 * The user may replace this with some multithreaded implementation,
2820 * the default implementation will execute the parts serially.
2821 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2822 * @param c context passed also to func
2823 * @param count the number of things to execute
2824 * @param arg2 argument passed unchanged to func
2825 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2826 * @param func function that will be called count times, with jobnr from 0 to count-1.
2827 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2828 * two instances of func executing at the same time will have the same threadnr.
2829 * @return always 0 currently, but code should handle a future improvement where when any call to func
2830 * returns < 0 no further calls to func may be done and < 0 is returned.
2831 * - encoding: Set by libavcodec, user can override.
2832 * - decoding: Set by libavcodec, user can override.
2834 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2836 #if FF_API_THREAD_OPAQUE
2838 * @deprecated this field should not be used from outside of lavc
2840 attribute_deprecated
2841 void *thread_opaque;
2845 * noise vs. sse weight for the nsse comparison function
2846 * - encoding: Set by user.
2847 * - decoding: unused
2853 * - encoding: Set by user.
2854 * - decoding: Set by libavcodec.
2857 #define FF_PROFILE_UNKNOWN -99
2858 #define FF_PROFILE_RESERVED -100
2860 #define FF_PROFILE_AAC_MAIN 0
2861 #define FF_PROFILE_AAC_LOW 1
2862 #define FF_PROFILE_AAC_SSR 2
2863 #define FF_PROFILE_AAC_LTP 3
2864 #define FF_PROFILE_AAC_HE 4
2865 #define FF_PROFILE_AAC_HE_V2 28
2866 #define FF_PROFILE_AAC_LD 22
2867 #define FF_PROFILE_AAC_ELD 38
2868 #define FF_PROFILE_MPEG2_AAC_LOW 128
2869 #define FF_PROFILE_MPEG2_AAC_HE 131
2871 #define FF_PROFILE_DTS 20
2872 #define FF_PROFILE_DTS_ES 30
2873 #define FF_PROFILE_DTS_96_24 40
2874 #define FF_PROFILE_DTS_HD_HRA 50
2875 #define FF_PROFILE_DTS_HD_MA 60
2876 #define FF_PROFILE_DTS_EXPRESS 70
2878 #define FF_PROFILE_MPEG2_422 0
2879 #define FF_PROFILE_MPEG2_HIGH 1
2880 #define FF_PROFILE_MPEG2_SS 2
2881 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2882 #define FF_PROFILE_MPEG2_MAIN 4
2883 #define FF_PROFILE_MPEG2_SIMPLE 5
2885 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2886 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2888 #define FF_PROFILE_H264_BASELINE 66
2889 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2890 #define FF_PROFILE_H264_MAIN 77
2891 #define FF_PROFILE_H264_EXTENDED 88
2892 #define FF_PROFILE_H264_HIGH 100
2893 #define FF_PROFILE_H264_HIGH_10 110
2894 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2895 #define FF_PROFILE_H264_HIGH_422 122
2896 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2897 #define FF_PROFILE_H264_HIGH_444 144
2898 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2899 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2900 #define FF_PROFILE_H264_CAVLC_444 44
2902 #define FF_PROFILE_VC1_SIMPLE 0
2903 #define FF_PROFILE_VC1_MAIN 1
2904 #define FF_PROFILE_VC1_COMPLEX 2
2905 #define FF_PROFILE_VC1_ADVANCED 3
2907 #define FF_PROFILE_MPEG4_SIMPLE 0
2908 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2909 #define FF_PROFILE_MPEG4_CORE 2
2910 #define FF_PROFILE_MPEG4_MAIN 3
2911 #define FF_PROFILE_MPEG4_N_BIT 4
2912 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2913 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2914 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2915 #define FF_PROFILE_MPEG4_HYBRID 8
2916 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2917 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2918 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2919 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2920 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2921 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2922 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2924 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2925 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2926 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2927 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2928 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2930 #define FF_PROFILE_VP9_0 0
2931 #define FF_PROFILE_VP9_1 1
2932 #define FF_PROFILE_VP9_2 2
2933 #define FF_PROFILE_VP9_3 3
2935 #define FF_PROFILE_HEVC_MAIN 1
2936 #define FF_PROFILE_HEVC_MAIN_10 2
2937 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2938 #define FF_PROFILE_HEVC_REXT 4
2942 * - encoding: Set by user.
2943 * - decoding: Set by libavcodec.
2946 #define FF_LEVEL_UNKNOWN -99
2949 * Skip loop filtering for selected frames.
2950 * - encoding: unused
2951 * - decoding: Set by user.
2953 enum AVDiscard skip_loop_filter;
2956 * Skip IDCT/dequantization for selected frames.
2957 * - encoding: unused
2958 * - decoding: Set by user.
2960 enum AVDiscard skip_idct;
2963 * Skip decoding for selected frames.
2964 * - encoding: unused
2965 * - decoding: Set by user.
2967 enum AVDiscard skip_frame;
2970 * Header containing style information for text subtitles.
2971 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2972 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2973 * the Format line following. It shouldn't include any Dialogue line.
2974 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2975 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2977 uint8_t *subtitle_header;
2978 int subtitle_header_size;
2980 #if FF_API_ERROR_RATE
2982 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2985 attribute_deprecated
2989 #if FF_API_CODEC_PKT
2991 * @deprecated this field is not supposed to be accessed from outside lavc
2993 attribute_deprecated
2998 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2999 * Used for compliant TS muxing.
3000 * - encoding: Set by libavcodec.
3001 * - decoding: unused.
3006 * Encoding only. Allow encoders to output packets that do not contain any
3007 * encoded data, only side data.
3009 * Some encoders need to output such packets, e.g. to update some stream
3010 * parameters at the end of encoding.
3012 * All callers are strongly recommended to set this option to 1 and update
3013 * their code to deal with such packets, since this behaviour may become
3014 * always enabled in the future (then this option will be deprecated and
3015 * later removed). To avoid ABI issues when this happens, the callers should
3016 * use AVOptions to set this field.
3018 int side_data_only_packets;
3021 * Audio only. The number of "priming" samples (padding) inserted by the
3022 * encoder at the beginning of the audio. I.e. this number of leading
3023 * decoded samples must be discarded by the caller to get the original audio
3024 * without leading padding.
3026 * - decoding: unused
3027 * - encoding: Set by libavcodec. The timestamps on the output packets are
3028 * adjusted by the encoder so that they always refer to the
3029 * first sample of the data actually contained in the packet,
3030 * including any added padding. E.g. if the timebase is
3031 * 1/samplerate and the timestamp of the first input sample is
3032 * 0, the timestamp of the first output packet will be
3035 int initial_padding;
3038 * - decoding: For codecs that store a framerate value in the compressed
3039 * bitstream, the decoder may export it here. { 0, 1} when
3041 * - encoding: unused
3043 AVRational framerate;
3046 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3047 * - encoding: unused.
3048 * - decoding: Set by libavcodec before calling get_format()
3050 enum AVPixelFormat sw_pix_fmt;
3053 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3054 * Code outside libavcodec should access this field using:
3055 * av_codec_{get,set}_pkt_timebase(avctx)
3056 * - encoding unused.
3057 * - decoding set by user.
3059 AVRational pkt_timebase;
3063 * Code outside libavcodec should access this field using:
3064 * av_codec_{get,set}_codec_descriptor(avctx)
3065 * - encoding: unused.
3066 * - decoding: set by libavcodec.
3068 const AVCodecDescriptor *codec_descriptor;
3072 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3073 * - encoding: unused
3074 * - decoding: Set by user.
3075 * Code outside libavcodec should access this field using:
3076 * av_codec_{get,set}_lowres(avctx)
3082 * Current statistics for PTS correction.
3083 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3084 * - encoding: unused
3086 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3087 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3088 int64_t pts_correction_last_pts; /// PTS of the last frame
3089 int64_t pts_correction_last_dts; /// DTS of the last frame
3092 * Character encoding of the input subtitles file.
3093 * - decoding: set by user
3094 * - encoding: unused
3099 * Subtitles character encoding mode. Formats or codecs might be adjusting
3100 * this setting (if they are doing the conversion themselves for instance).
3101 * - decoding: set by libavcodec
3102 * - encoding: unused
3104 int sub_charenc_mode;
3105 #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)
3106 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3107 #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
3110 * Skip processing alpha if supported by codec.
3111 * Note that if the format uses pre-multiplied alpha (common with VP6,
3112 * and recommended due to better video quality/compression)
3113 * the image will look as if alpha-blended onto a black background.
3114 * However for formats that do not use pre-multiplied alpha
3115 * there might be serious artefacts (though e.g. libswscale currently
3116 * assumes pre-multiplied alpha anyway).
3117 * Code outside libavcodec should access this field using AVOptions
3119 * - decoding: set by user
3120 * - encoding: unused
3125 * Number of samples to skip after a discontinuity
3126 * - decoding: unused
3127 * - encoding: set by libavcodec
3131 #if !FF_API_DEBUG_MV
3133 * debug motion vectors
3134 * Code outside libavcodec should access this field using AVOptions
3135 * - encoding: Set by user.
3136 * - decoding: Set by user.
3139 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3140 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3141 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3145 * custom intra quantization matrix
3146 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3147 * - encoding: Set by user, can be NULL.
3148 * - decoding: unused.
3150 uint16_t *chroma_intra_matrix;
3153 * dump format separator.
3154 * can be ", " or "\n " or anything else
3155 * Code outside libavcodec should access this field using AVOptions
3156 * (NO direct access).
3157 * - encoding: Set by user.
3158 * - decoding: Set by user.
3160 uint8_t *dump_separator;
3163 * ',' separated list of allowed decoders.
3164 * If NULL then all are allowed
3165 * - encoding: unused
3166 * - decoding: set by user through AVOPtions (NO direct access)
3168 char *codec_whitelist;
3171 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3172 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3174 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3175 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3177 int av_codec_get_lowres(const AVCodecContext *avctx);
3178 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3180 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3181 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3183 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3184 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3189 typedef struct AVProfile {
3191 const char *name; ///< short name for the profile
3194 typedef struct AVCodecDefault AVCodecDefault;
3201 typedef struct AVCodec {
3203 * Name of the codec implementation.
3204 * The name is globally unique among encoders and among decoders (but an
3205 * encoder and a decoder can share the same name).
3206 * This is the primary way to find a codec from the user perspective.
3210 * Descriptive name for the codec, meant to be more human readable than name.
3211 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3213 const char *long_name;
3214 enum AVMediaType type;
3217 * Codec capabilities.
3221 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3222 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3223 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3224 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3225 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3227 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3229 const AVClass *priv_class; ///< AVClass for the private context
3230 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3232 /*****************************************************************
3233 * No fields below this line are part of the public API. They
3234 * may not be used outside of libavcodec and can be changed and
3236 * New public fields should be added right above.
3237 *****************************************************************
3240 struct AVCodec *next;
3242 * @name Frame-level threading support functions
3246 * If defined, called on thread contexts when they are created.
3247 * If the codec allocates writable tables in init(), re-allocate them here.
3248 * priv_data will be set to a copy of the original.
3250 int (*init_thread_copy)(AVCodecContext *);
3252 * Copy necessary context variables from a previous thread context to the current one.
3253 * If not defined, the next thread will start automatically; otherwise, the codec
3254 * must call ff_thread_finish_setup().
3256 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3258 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3262 * Private codec-specific defaults.
3264 const AVCodecDefault *defaults;
3267 * Initialize codec static data, called from avcodec_register().
3269 void (*init_static_data)(struct AVCodec *codec);
3271 int (*init)(AVCodecContext *);
3272 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3273 const struct AVSubtitle *sub);
3275 * Encode data to an AVPacket.
3277 * @param avctx codec context
3278 * @param avpkt output AVPacket (may contain a user-provided buffer)
3279 * @param[in] frame AVFrame containing the raw data to be encoded
3280 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3281 * non-empty packet was returned in avpkt.
3282 * @return 0 on success, negative error code on failure
3284 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3285 int *got_packet_ptr);
3286 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3287 int (*close)(AVCodecContext *);
3290 * Will be called when seeking
3292 void (*flush)(AVCodecContext *);
3294 * Internal codec capabilities.
3295 * See FF_CODEC_CAP_* in internal.h
3300 int av_codec_get_max_lowres(const AVCodec *codec);
3302 struct MpegEncContext;
3305 * @defgroup lavc_hwaccel AVHWAccel
3308 typedef struct AVHWAccel {
3310 * Name of the hardware accelerated codec.
3311 * The name is globally unique among encoders and among decoders (but an
3312 * encoder and a decoder can share the same name).
3317 * Type of codec implemented by the hardware accelerator.
3319 * See AVMEDIA_TYPE_xxx
3321 enum AVMediaType type;
3324 * Codec implemented by the hardware accelerator.
3326 * See AV_CODEC_ID_xxx
3331 * Supported pixel format.
3333 * Only hardware accelerated formats are supported here.
3335 enum AVPixelFormat pix_fmt;
3338 * Hardware accelerated codec capabilities.
3339 * see FF_HWACCEL_CODEC_CAP_*
3343 /*****************************************************************
3344 * No fields below this line are part of the public API. They
3345 * may not be used outside of libavcodec and can be changed and
3347 * New public fields should be added right above.
3348 *****************************************************************
3350 struct AVHWAccel *next;
3353 * Allocate a custom buffer
3355 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3358 * Called at the beginning of each frame or field picture.
3360 * Meaningful frame information (codec specific) is guaranteed to
3361 * be parsed at this point. This function is mandatory.
3363 * Note that buf can be NULL along with buf_size set to 0.
3364 * Otherwise, this means the whole frame is available at this point.
3366 * @param avctx the codec context
3367 * @param buf the frame data buffer base
3368 * @param buf_size the size of the frame in bytes
3369 * @return zero if successful, a negative value otherwise
3371 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3374 * Callback for each slice.
3376 * Meaningful slice information (codec specific) is guaranteed to
3377 * be parsed at this point. This function is mandatory.
3378 * The only exception is XvMC, that works on MB level.
3380 * @param avctx the codec context
3381 * @param buf the slice data buffer base
3382 * @param buf_size the size of the slice in bytes
3383 * @return zero if successful, a negative value otherwise
3385 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3388 * Called at the end of each frame or field picture.
3390 * The whole picture is parsed at this point and can now be sent
3391 * to the hardware accelerator. This function is mandatory.
3393 * @param avctx the codec context
3394 * @return zero if successful, a negative value otherwise
3396 int (*end_frame)(AVCodecContext *avctx);
3399 * Size of per-frame hardware accelerator private data.
3401 * Private data is allocated with av_mallocz() before
3402 * AVCodecContext.get_buffer() and deallocated after
3403 * AVCodecContext.release_buffer().
3405 int frame_priv_data_size;
3408 * Called for every Macroblock in a slice.
3410 * XvMC uses it to replace the ff_mpv_decode_mb().
3411 * Instead of decoding to raw picture, MB parameters are
3412 * stored in an array provided by the video driver.
3414 * @param s the mpeg context
3416 void (*decode_mb)(struct MpegEncContext *s);
3419 * Initialize the hwaccel private data.
3421 * This will be called from ff_get_format(), after hwaccel and
3422 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3425 int (*init)(AVCodecContext *avctx);
3428 * Uninitialize the hwaccel private data.
3430 * This will be called from get_format() or avcodec_close(), after hwaccel
3431 * and hwaccel_context are already uninitialized.
3433 int (*uninit)(AVCodecContext *avctx);
3436 * Size of the private data to allocate in
3437 * AVCodecInternal.hwaccel_priv_data.
3443 * Hardware acceleration should be used for decoding even if the codec level
3444 * used is unknown or higher than the maximum supported level reported by the
3447 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3450 * Hardware acceleration can output YUV pixel formats with a different chroma
3451 * sampling than 4:2:0 and/or other than 8 bits per component.
3453 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3460 * @defgroup lavc_picture AVPicture
3462 * Functions for working with AVPicture
3467 * Picture data structure.
3469 * Up to four components can be stored into it, the last component is
3472 typedef struct AVPicture {
3473 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3474 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3481 enum AVSubtitleType {
3484 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3487 * Plain text, the text field must be set by the decoder and is
3488 * authoritative. ass and pict fields may contain approximations.
3493 * Formatted text, the ass field must be set by the decoder and is
3494 * authoritative. pict and text fields may contain approximations.
3499 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3501 typedef struct AVSubtitleRect {
3502 int x; ///< top left corner of pict, undefined when pict is not set
3503 int y; ///< top left corner of pict, undefined when pict is not set
3504 int w; ///< width of pict, undefined when pict is not set
3505 int h; ///< height of pict, undefined when pict is not set
3506 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3509 * data+linesize for the bitmap of this subtitle.
3510 * can be set for text/ass as well once they are rendered
3513 enum AVSubtitleType type;
3515 char *text; ///< 0 terminated plain UTF-8 text
3518 * 0 terminated ASS/SSA compatible event line.
3519 * The presentation of this is unaffected by the other values in this
3527 typedef struct AVSubtitle {
3528 uint16_t format; /* 0 = graphics */
3529 uint32_t start_display_time; /* relative to packet pts, in ms */
3530 uint32_t end_display_time; /* relative to packet pts, in ms */
3532 AVSubtitleRect **rects;
3533 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3537 * If c is NULL, returns the first registered codec,
3538 * if c is non-NULL, returns the next registered codec after c,
3539 * or NULL if c is the last one.
3541 AVCodec *av_codec_next(const AVCodec *c);
3544 * Return the LIBAVCODEC_VERSION_INT constant.
3546 unsigned avcodec_version(void);
3549 * Return the libavcodec build-time configuration.
3551 const char *avcodec_configuration(void);
3554 * Return the libavcodec license.
3556 const char *avcodec_license(void);
3559 * Register the codec codec and initialize libavcodec.
3561 * @warning either this function or avcodec_register_all() must be called
3562 * before any other libavcodec functions.
3564 * @see avcodec_register_all()
3566 void avcodec_register(AVCodec *codec);
3569 * Register all the codecs, parsers and bitstream filters which were enabled at
3570 * configuration time. If you do not call this function you can select exactly
3571 * which formats you want to support, by using the individual registration
3574 * @see avcodec_register
3575 * @see av_register_codec_parser
3576 * @see av_register_bitstream_filter
3578 void avcodec_register_all(void);
3581 * Allocate an AVCodecContext and set its fields to default values. The
3582 * resulting struct should be freed with avcodec_free_context().
3584 * @param codec if non-NULL, allocate private data and initialize defaults
3585 * for the given codec. It is illegal to then call avcodec_open2()
3586 * with a different codec.
3587 * If NULL, then the codec-specific defaults won't be initialized,
3588 * which may result in suboptimal default settings (this is
3589 * important mainly for encoders, e.g. libx264).
3591 * @return An AVCodecContext filled with default values or NULL on failure.
3592 * @see avcodec_get_context_defaults
3594 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3597 * Free the codec context and everything associated with it and write NULL to
3598 * the provided pointer.
3600 void avcodec_free_context(AVCodecContext **avctx);
3603 * Set the fields of the given AVCodecContext to default values corresponding
3604 * to the given codec (defaults may be codec-dependent).
3606 * Do not call this function if a non-NULL codec has been passed
3607 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3608 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3609 * different codec on this AVCodecContext.
3611 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3614 * Get the AVClass for AVCodecContext. It can be used in combination with
3615 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3617 * @see av_opt_find().
3619 const AVClass *avcodec_get_class(void);
3622 * Get the AVClass for AVFrame. It can be used in combination with
3623 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3625 * @see av_opt_find().
3627 const AVClass *avcodec_get_frame_class(void);
3630 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3631 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3633 * @see av_opt_find().
3635 const AVClass *avcodec_get_subtitle_rect_class(void);
3638 * Copy the settings of the source AVCodecContext into the destination
3639 * AVCodecContext. The resulting destination codec context will be
3640 * unopened, i.e. you are required to call avcodec_open2() before you
3641 * can use this AVCodecContext to decode/encode video/audio data.
3643 * @param dest target codec context, should be initialized with
3644 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3645 * @param src source codec context
3646 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3648 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3650 #if FF_API_AVFRAME_LAVC
3652 * @deprecated use av_frame_alloc()
3654 attribute_deprecated
3655 AVFrame *avcodec_alloc_frame(void);
3658 * Set the fields of the given AVFrame to default values.
3660 * @param frame The AVFrame of which the fields should be set to default values.
3662 * @deprecated use av_frame_unref()
3664 attribute_deprecated
3665 void avcodec_get_frame_defaults(AVFrame *frame);
3668 * Free the frame and any dynamically allocated objects in it,
3669 * e.g. extended_data.
3671 * @param frame frame to be freed. The pointer will be set to NULL.
3673 * @warning this function does NOT free the data buffers themselves
3674 * (it does not know how, since they might have been allocated with
3675 * a custom get_buffer()).
3677 * @deprecated use av_frame_free()
3679 attribute_deprecated
3680 void avcodec_free_frame(AVFrame **frame);
3684 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3685 * function the context has to be allocated with avcodec_alloc_context3().
3687 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3688 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3689 * retrieving a codec.
3691 * @warning This function is not thread safe!
3693 * @note Always call this function before using decoding routines (such as
3694 * @ref avcodec_decode_video2()).
3697 * avcodec_register_all();
3698 * av_dict_set(&opts, "b", "2.5M", 0);
3699 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3703 * context = avcodec_alloc_context3(codec);
3705 * if (avcodec_open2(context, codec, opts) < 0)
3709 * @param avctx The context to initialize.
3710 * @param codec The codec to open this context for. If a non-NULL codec has been
3711 * previously passed to avcodec_alloc_context3() or
3712 * avcodec_get_context_defaults3() for this context, then this
3713 * parameter MUST be either NULL or equal to the previously passed
3715 * @param options A dictionary filled with AVCodecContext and codec-private options.
3716 * On return this object will be filled with options that were not found.
3718 * @return zero on success, a negative value on error
3719 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3720 * av_dict_set(), av_opt_find().
3722 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3725 * Close a given AVCodecContext and free all the data associated with it
3726 * (but not the AVCodecContext itself).
3728 * Calling this function on an AVCodecContext that hasn't been opened will free
3729 * the codec-specific data allocated in avcodec_alloc_context3() /
3730 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3733 int avcodec_close(AVCodecContext *avctx);
3736 * Free all allocated data in the given subtitle struct.
3738 * @param sub AVSubtitle to free.
3740 void avsubtitle_free(AVSubtitle *sub);
3747 * @addtogroup lavc_packet
3751 #if FF_API_DESTRUCT_PACKET
3753 * Default packet destructor.
3754 * @deprecated use the AVBuffer API instead
3756 attribute_deprecated
3757 void av_destruct_packet(AVPacket *pkt);
3761 * Initialize optional fields of a packet with default values.
3763 * Note, this does not touch the data and size members, which have to be
3764 * initialized separately.
3768 void av_init_packet(AVPacket *pkt);
3771 * Allocate the payload of a packet and initialize its fields with
3775 * @param size wanted payload size
3776 * @return 0 if OK, AVERROR_xxx otherwise
3778 int av_new_packet(AVPacket *pkt, int size);
3781 * Reduce packet size, correctly zeroing padding
3784 * @param size new size
3786 void av_shrink_packet(AVPacket *pkt, int size);
3789 * Increase packet size, correctly zeroing padding
3792 * @param grow_by number of bytes by which to increase the size of the packet
3794 int av_grow_packet(AVPacket *pkt, int grow_by);
3797 * Initialize a reference-counted packet from av_malloc()ed data.
3799 * @param pkt packet to be initialized. This function will set the data, size,
3800 * buf and destruct fields, all others are left untouched.
3801 * @param data Data allocated by av_malloc() to be used as packet data. If this
3802 * function returns successfully, the data is owned by the underlying AVBuffer.
3803 * The caller may not access the data through other means.
3804 * @param size size of data in bytes, without the padding. I.e. the full buffer
3805 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3807 * @return 0 on success, a negative AVERROR on error
3809 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3812 * @warning This is a hack - the packet memory allocation stuff is broken. The
3813 * packet is allocated if it was not really allocated.
3815 int av_dup_packet(AVPacket *pkt);
3818 * Copy packet, including contents
3820 * @return 0 on success, negative AVERROR on fail
3822 int av_copy_packet(AVPacket *dst, const AVPacket *src);
3825 * Copy packet side data
3827 * @return 0 on success, negative AVERROR on fail
3829 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
3834 * @param pkt packet to free
3836 void av_free_packet(AVPacket *pkt);
3839 * Allocate new information of a packet.
3842 * @param type side information type
3843 * @param size side information size
3844 * @return pointer to fresh allocated data or NULL otherwise
3846 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3850 * Shrink the already allocated side data buffer
3853 * @param type side information type
3854 * @param size new side information size
3855 * @return 0 on success, < 0 on failure
3857 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3861 * Get side information from packet.
3864 * @param type desired side information type
3865 * @param size pointer for side information size to store (optional)
3866 * @return pointer to data if present or NULL otherwise
3868 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3871 int av_packet_merge_side_data(AVPacket *pkt);
3873 int av_packet_split_side_data(AVPacket *pkt);
3875 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
3878 * Pack a dictionary for use in side_data.
3880 * @param dict The dictionary to pack.
3881 * @param size pointer to store the size of the returned data
3882 * @return pointer to data if successful, NULL otherwise
3884 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
3886 * Unpack a dictionary from side_data.
3888 * @param data data from side_data
3889 * @param size size of the data
3890 * @param dict the metadata storage dictionary
3891 * @return 0 on success, < 0 on failure
3893 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
3897 * Convenience function to free all the side data stored.
3898 * All the other fields stay untouched.
3902 void av_packet_free_side_data(AVPacket *pkt);
3905 * Setup a new reference to the data described by a given packet
3907 * If src is reference-counted, setup dst as a new reference to the
3908 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3909 * data from src into it.
3911 * All the other fields are copied from src.
3913 * @see av_packet_unref
3915 * @param dst Destination packet
3916 * @param src Source packet
3918 * @return 0 on success, a negative AVERROR on error.
3920 int av_packet_ref(AVPacket *dst, const AVPacket *src);
3925 * Unreference the buffer referenced by the packet and reset the
3926 * remaining packet fields to their default values.
3928 * @param pkt The packet to be unreferenced.
3930 void av_packet_unref(AVPacket *pkt);
3933 * Move every field in src to dst and reset src.
3935 * @see av_packet_unref
3937 * @param src Source packet, will be reset
3938 * @param dst Destination packet
3940 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3943 * Copy only "properties" fields from src to dst.
3945 * Properties for the purpose of this function are all the fields
3946 * beside those related to the packet data (buf, data, size)
3948 * @param dst Destination packet
3949 * @param src Source packet
3951 * @return 0 on success AVERROR on failure.
3954 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3957 * Convert valid timing fields (timestamps / durations) in a packet from one
3958 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
3961 * @param pkt packet on which the conversion will be performed
3962 * @param tb_src source timebase, in which the timing fields in pkt are
3964 * @param tb_dst destination timebase, to which the timing fields will be
3967 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
3974 * @addtogroup lavc_decoding
3979 * Find a registered decoder with a matching codec ID.
3981 * @param id AVCodecID of the requested decoder
3982 * @return A decoder if one was found, NULL otherwise.
3984 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3987 * Find a registered decoder with the specified name.
3989 * @param name name of the requested decoder
3990 * @return A decoder if one was found, NULL otherwise.
3992 AVCodec *avcodec_find_decoder_by_name(const char *name);
3994 #if FF_API_GET_BUFFER
3995 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3996 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3997 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
4001 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4002 * it can be called by custom get_buffer2() implementations for decoders without
4003 * CODEC_CAP_DR1 set.
4005 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4009 * Return the amount of padding in pixels which the get_buffer callback must
4010 * provide around the edge of the image for codecs which do not have the
4011 * CODEC_FLAG_EMU_EDGE flag.
4013 * @return Required padding in pixels.
4015 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4018 attribute_deprecated
4019 unsigned avcodec_get_edge_width(void);
4023 * Modify width and height values so that they will result in a memory
4024 * buffer that is acceptable for the codec if you do not use any horizontal
4027 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4029 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4032 * Modify width and height values so that they will result in a memory
4033 * buffer that is acceptable for the codec if you also ensure that all
4034 * line sizes are a multiple of the respective linesize_align[i].
4036 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4038 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4039 int linesize_align[AV_NUM_DATA_POINTERS]);
4042 * Converts AVChromaLocation to swscale x/y chroma position.
4044 * The positions represent the chroma (0,0) position in a coordinates system
4045 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4047 * @param xpos horizontal chroma sample position
4048 * @param ypos vertical chroma sample position
4050 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4053 * Converts swscale x/y chroma position to AVChromaLocation.
4055 * The positions represent the chroma (0,0) position in a coordinates system
4056 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4058 * @param xpos horizontal chroma sample position
4059 * @param ypos vertical chroma sample position
4061 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4063 #if FF_API_OLD_DECODE_AUDIO
4065 * Wrapper function which calls avcodec_decode_audio4.
4067 * @deprecated Use avcodec_decode_audio4 instead.
4069 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
4070 * Some decoders may support multiple frames in a single AVPacket, such
4071 * decoders would then just decode the first frame. In this case,
4072 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
4073 * the remaining data in order to decode the second frame etc.
4075 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
4076 * decompressed frame size in bytes.
4078 * @warning You must set frame_size_ptr to the allocated size of the
4079 * output buffer before calling avcodec_decode_audio3().
4081 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4082 * the actual read bytes because some optimized bitstream readers read 32 or 64
4083 * bits at once and could read over the end.
4085 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
4086 * no overreading happens for damaged MPEG streams.
4088 * @warning You must not provide a custom get_buffer() when using
4089 * avcodec_decode_audio3(). Doing so will override it with
4090 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
4091 * which does allow the application to provide a custom get_buffer().
4093 * @note You might have to align the input buffer avpkt->data and output buffer
4094 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
4095 * necessary at all, on others it won't work at all if not aligned and on others
4096 * it will work but it will have an impact on performance.
4098 * In practice, avpkt->data should have 4 byte alignment at minimum and
4099 * samples should be 16 byte aligned unless the CPU doesn't need it
4100 * (AltiVec and SSE do).
4102 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4103 * between input and output, these need to be fed with avpkt->data=NULL,
4104 * avpkt->size=0 at the end to return the remaining frames.
4106 * @param avctx the codec context
4107 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
4108 * If the sample format is planar, each channel plane will
4109 * be the same size, with no padding between channels.
4110 * @param[in,out] frame_size_ptr the output buffer size in bytes
4111 * @param[in] avpkt The input AVPacket containing the input buffer.
4112 * You can create such packet with av_init_packet() and by then setting
4113 * data and size, some decoders might in addition need other fields.
4114 * All decoders are designed to use the least fields possible though.
4115 * @return On error a negative value is returned, otherwise the number of bytes
4116 * used or zero if no frame data was decompressed (used) from the input AVPacket.
4118 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
4119 int *frame_size_ptr,
4124 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4126 * Some decoders may support multiple frames in a single AVPacket. Such
4127 * decoders would then just decode the first frame and the return value would be
4128 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4129 * called again with an AVPacket containing the remaining data in order to
4130 * decode the second frame, etc... Even if no frames are returned, the packet
4131 * needs to be fed to the decoder with remaining data until it is completely
4132 * consumed or an error occurs.
4134 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4135 * and output. This means that for some packets they will not immediately
4136 * produce decoded output and need to be flushed at the end of decoding to get
4137 * all the decoded data. Flushing is done by calling this function with packets
4138 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4139 * returning samples. It is safe to flush even those decoders that are not
4140 * marked with CODEC_CAP_DELAY, then no samples will be returned.
4142 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
4143 * larger than the actual read bytes because some optimized bitstream
4144 * readers read 32 or 64 bits at once and could read over the end.
4146 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4147 * before packets may be fed to the decoder.
4149 * @param avctx the codec context
4150 * @param[out] frame The AVFrame in which to store decoded audio samples.
4151 * The decoder will allocate a buffer for the decoded frame by
4152 * calling the AVCodecContext.get_buffer2() callback.
4153 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4154 * reference counted and the returned reference belongs to the
4155 * caller. The caller must release the frame using av_frame_unref()
4156 * when the frame is no longer needed. The caller may safely write
4157 * to the frame if av_frame_is_writable() returns 1.
4158 * When AVCodecContext.refcounted_frames is set to 0, the returned
4159 * reference belongs to the decoder and is valid only until the
4160 * next call to this function or until closing or flushing the
4161 * decoder. The caller may not write to it.
4162 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4163 * non-zero. Note that this field being set to zero
4164 * does not mean that an error has occurred. For
4165 * decoders with CODEC_CAP_DELAY set, no given decode
4166 * call is guaranteed to produce a frame.
4167 * @param[in] avpkt The input AVPacket containing the input buffer.
4168 * At least avpkt->data and avpkt->size should be set. Some
4169 * decoders might also require additional fields to be set.
4170 * @return A negative error code is returned if an error occurred during
4171 * decoding, otherwise the number of bytes consumed from the input
4172 * AVPacket is returned.
4174 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4175 int *got_frame_ptr, const AVPacket *avpkt);
4178 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4179 * Some decoders may support multiple frames in a single AVPacket, such
4180 * decoders would then just decode the first frame.
4182 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4183 * the actual read bytes because some optimized bitstream readers read 32 or 64
4184 * bits at once and could read over the end.
4186 * @warning The end of the input buffer buf should be set to 0 to ensure that
4187 * no overreading happens for damaged MPEG streams.
4189 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4190 * between input and output, these need to be fed with avpkt->data=NULL,
4191 * avpkt->size=0 at the end to return the remaining frames.
4193 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4194 * before packets may be fed to the decoder.
4196 * @param avctx the codec context
4197 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4198 * Use av_frame_alloc() to get an AVFrame. The codec will
4199 * allocate memory for the actual bitmap by calling the
4200 * AVCodecContext.get_buffer2() callback.
4201 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4202 * reference counted and the returned reference belongs to the
4203 * caller. The caller must release the frame using av_frame_unref()
4204 * when the frame is no longer needed. The caller may safely write
4205 * to the frame if av_frame_is_writable() returns 1.
4206 * When AVCodecContext.refcounted_frames is set to 0, the returned
4207 * reference belongs to the decoder and is valid only until the
4208 * next call to this function or until closing or flushing the
4209 * decoder. The caller may not write to it.
4211 * @param[in] avpkt The input AVPacket containing the input buffer.
4212 * You can create such packet with av_init_packet() and by then setting
4213 * data and size, some decoders might in addition need other fields like
4214 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4216 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4217 * @return On error a negative value is returned, otherwise the number of bytes
4218 * used or zero if no frame could be decompressed.
4220 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4221 int *got_picture_ptr,
4222 const AVPacket *avpkt);
4225 * Decode a subtitle message.
4226 * Return a negative value on error, otherwise return the number of bytes used.
4227 * If no subtitle could be decompressed, got_sub_ptr is zero.
4228 * Otherwise, the subtitle is stored in *sub.
4229 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4230 * simplicity, because the performance difference is expect to be negligible
4231 * and reusing a get_buffer written for video codecs would probably perform badly
4232 * due to a potentially very different allocation pattern.
4234 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4235 * and output. This means that for some packets they will not immediately
4236 * produce decoded output and need to be flushed at the end of decoding to get
4237 * all the decoded data. Flushing is done by calling this function with packets
4238 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4239 * returning subtitles. It is safe to flush even those decoders that are not
4240 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4242 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4243 * before packets may be fed to the decoder.
4245 * @param avctx the codec context
4246 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4247 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4248 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4249 * @param[in] avpkt The input AVPacket containing the input buffer.
4251 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4256 * @defgroup lavc_parsing Frame parsing
4260 enum AVPictureStructure {
4261 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4262 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4263 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4264 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4267 typedef struct AVCodecParserContext {
4269 struct AVCodecParser *parser;
4270 int64_t frame_offset; /* offset of the current frame */
4271 int64_t cur_offset; /* current offset
4272 (incremented by each av_parser_parse()) */
4273 int64_t next_frame_offset; /* offset of the next frame */
4275 int pict_type; /* XXX: Put it back in AVCodecContext. */
4277 * This field is used for proper frame duration computation in lavf.
4278 * It signals, how much longer the frame duration of the current frame
4279 * is compared to normal frame duration.
4281 * frame_duration = (1 + repeat_pict) * time_base
4283 * It is used by codecs like H.264 to display telecined material.
4285 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4286 int64_t pts; /* pts of the current frame */
4287 int64_t dts; /* dts of the current frame */
4292 int fetch_timestamp;
4294 #define AV_PARSER_PTS_NB 4
4295 int cur_frame_start_index;
4296 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4297 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4298 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4301 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4302 #define PARSER_FLAG_ONCE 0x0002
4303 /// Set if the parser has a valid file offset
4304 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4305 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4307 int64_t offset; ///< byte offset from starting packet start
4308 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4311 * Set by parser to 1 for key frames and 0 for non-key frames.
4312 * It is initialized to -1, so if the parser doesn't set this flag,
4313 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4319 * Time difference in stream time base units from the pts of this
4320 * packet to the point at which the output from the decoder has converged
4321 * independent from the availability of previous frames. That is, the
4322 * frames are virtually identical no matter if decoding started from
4323 * the very first frame or from this keyframe.
4324 * Is AV_NOPTS_VALUE if unknown.
4325 * This field is not the display duration of the current frame.
4326 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4329 * The purpose of this field is to allow seeking in streams that have no
4330 * keyframes in the conventional sense. It corresponds to the
4331 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4332 * essential for some types of subtitle streams to ensure that all
4333 * subtitles are correctly displayed after seeking.
4335 int64_t convergence_duration;
4337 // Timestamp generation support:
4339 * Synchronization point for start of timestamp generation.
4341 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4344 * For example, this corresponds to presence of H.264 buffering period
4350 * Offset of the current timestamp against last timestamp sync point in
4351 * units of AVCodecContext.time_base.
4353 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4354 * contain a valid timestamp offset.
4356 * Note that the timestamp of sync point has usually a nonzero
4357 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4358 * the next frame after timestamp sync point will be usually 1.
4360 * For example, this corresponds to H.264 cpb_removal_delay.
4362 int dts_ref_dts_delta;
4365 * Presentation delay of current frame in units of AVCodecContext.time_base.
4367 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4368 * contain valid non-negative timestamp delta (presentation time of a frame
4369 * must not lie in the past).
4371 * This delay represents the difference between decoding and presentation
4372 * time of the frame.
4374 * For example, this corresponds to H.264 dpb_output_delay.
4379 * Position of the packet in file.
4381 * Analogous to cur_frame_pts/dts
4383 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4386 * Byte position of currently parsed frame in stream.
4391 * Previous frame byte position.
4396 * Duration of the current frame.
4397 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4398 * For all other types, this is in units of AVCodecContext.time_base.
4402 enum AVFieldOrder field_order;
4405 * Indicate whether a picture is coded as a frame, top field or bottom field.
4407 * For example, H.264 field_pic_flag equal to 0 corresponds to
4408 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4409 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4410 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4412 enum AVPictureStructure picture_structure;
4415 * Picture number incremented in presentation or output order.
4416 * This field may be reinitialized at the first picture of a new sequence.
4418 * For example, this corresponds to H.264 PicOrderCnt.
4420 int output_picture_number;
4423 * Dimensions of the decoded video intended for presentation.
4429 * Dimensions of the coded video.
4435 * The format of the coded data, corresponds to enum AVPixelFormat for video
4436 * and for enum AVSampleFormat for audio.
4438 * Note that a decoder can have considerable freedom in how exactly it
4439 * decodes the data, so the format reported here might be different from the
4440 * one returned by a decoder.
4443 } AVCodecParserContext;
4445 typedef struct AVCodecParser {
4446 int codec_ids[5]; /* several codec IDs are permitted */
4448 int (*parser_init)(AVCodecParserContext *s);
4449 /* This callback never returns an error, a negative value means that
4450 * the frame start was in a previous packet. */
4451 int (*parser_parse)(AVCodecParserContext *s,
4452 AVCodecContext *avctx,
4453 const uint8_t **poutbuf, int *poutbuf_size,
4454 const uint8_t *buf, int buf_size);
4455 void (*parser_close)(AVCodecParserContext *s);
4456 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4457 struct AVCodecParser *next;
4460 AVCodecParser *av_parser_next(const AVCodecParser *c);
4462 void av_register_codec_parser(AVCodecParser *parser);
4463 AVCodecParserContext *av_parser_init(int codec_id);
4468 * @param s parser context.
4469 * @param avctx codec context.
4470 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4471 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4472 * @param buf input buffer.
4473 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4474 * @param pts input presentation timestamp.
4475 * @param dts input decoding timestamp.
4476 * @param pos input byte position in stream.
4477 * @return the number of bytes of the input bitstream used.
4482 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4489 * decode_frame(data, size);
4493 int av_parser_parse2(AVCodecParserContext *s,
4494 AVCodecContext *avctx,
4495 uint8_t **poutbuf, int *poutbuf_size,
4496 const uint8_t *buf, int buf_size,
4497 int64_t pts, int64_t dts,
4501 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4502 * @deprecated use AVBitStreamFilter
4504 int av_parser_change(AVCodecParserContext *s,
4505 AVCodecContext *avctx,
4506 uint8_t **poutbuf, int *poutbuf_size,
4507 const uint8_t *buf, int buf_size, int keyframe);
4508 void av_parser_close(AVCodecParserContext *s);
4516 * @addtogroup lavc_encoding
4521 * Find a registered encoder with a matching codec ID.
4523 * @param id AVCodecID of the requested encoder
4524 * @return An encoder if one was found, NULL otherwise.
4526 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4529 * Find a registered encoder with the specified name.
4531 * @param name name of the requested encoder
4532 * @return An encoder if one was found, NULL otherwise.
4534 AVCodec *avcodec_find_encoder_by_name(const char *name);
4536 #if FF_API_OLD_ENCODE_AUDIO
4538 * Encode an audio frame from samples into buf.
4540 * @deprecated Use avcodec_encode_audio2 instead.
4542 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4543 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4544 * will know how much space is needed because it depends on the value passed
4545 * in buf_size as described below. In that case a lower value can be used.
4547 * @param avctx the codec context
4548 * @param[out] buf the output buffer
4549 * @param[in] buf_size the output buffer size
4550 * @param[in] samples the input buffer containing the samples
4551 * The number of samples read from this buffer is frame_size*channels,
4552 * both of which are defined in avctx.
4553 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4554 * samples read from samples is equal to:
4555 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4556 * This also implies that av_get_bits_per_sample() must not return 0 for these
4558 * @return On error a negative value is returned, on success zero or the number
4559 * of bytes used to encode the data read from the input buffer.
4561 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4562 uint8_t *buf, int buf_size,
4563 const short *samples);
4567 * Encode a frame of audio.
4569 * Takes input samples from frame and writes the next output packet, if
4570 * available, to avpkt. The output packet does not necessarily contain data for
4571 * the most recent frame, as encoders can delay, split, and combine input frames
4572 * internally as needed.
4574 * @param avctx codec context
4575 * @param avpkt output AVPacket.
4576 * The user can supply an output buffer by setting
4577 * avpkt->data and avpkt->size prior to calling the
4578 * function, but if the size of the user-provided data is not
4579 * large enough, encoding will fail. If avpkt->data and
4580 * avpkt->size are set, avpkt->destruct must also be set. All
4581 * other AVPacket fields will be reset by the encoder using
4582 * av_init_packet(). If avpkt->data is NULL, the encoder will
4583 * allocate it. The encoder will set avpkt->size to the size
4584 * of the output packet.
4586 * If this function fails or produces no output, avpkt will be
4587 * freed using av_free_packet() (i.e. avpkt->destruct will be
4588 * called to free the user supplied buffer).
4589 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4590 * May be NULL when flushing an encoder that has the
4591 * CODEC_CAP_DELAY capability set.
4592 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4593 * can have any number of samples.
4594 * If it is not set, frame->nb_samples must be equal to
4595 * avctx->frame_size for all frames except the last.
4596 * The final frame may be smaller than avctx->frame_size.
4597 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4598 * output packet is non-empty, and to 0 if it is
4599 * empty. If the function returns an error, the
4600 * packet can be assumed to be invalid, and the
4601 * value of got_packet_ptr is undefined and should
4603 * @return 0 on success, negative error code on failure
4605 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4606 const AVFrame *frame, int *got_packet_ptr);
4608 #if FF_API_OLD_ENCODE_VIDEO
4610 * @deprecated use avcodec_encode_video2() instead.
4612 * Encode a video frame from pict into buf.
4613 * The input picture should be
4614 * stored using a specific format, namely avctx.pix_fmt.
4616 * @param avctx the codec context
4617 * @param[out] buf the output buffer for the bitstream of encoded frame
4618 * @param[in] buf_size the size of the output buffer in bytes
4619 * @param[in] pict the input picture to encode
4620 * @return On error a negative value is returned, on success zero or the number
4621 * of bytes used from the output buffer.
4623 attribute_deprecated
4624 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4625 const AVFrame *pict);
4629 * Encode a frame of video.
4631 * Takes input raw video data from frame and writes the next output packet, if
4632 * available, to avpkt. The output packet does not necessarily contain data for
4633 * the most recent frame, as encoders can delay and reorder input frames
4634 * internally as needed.
4636 * @param avctx codec context
4637 * @param avpkt output AVPacket.
4638 * The user can supply an output buffer by setting
4639 * avpkt->data and avpkt->size prior to calling the
4640 * function, but if the size of the user-provided data is not
4641 * large enough, encoding will fail. All other AVPacket fields
4642 * will be reset by the encoder using av_init_packet(). If
4643 * avpkt->data is NULL, the encoder will allocate it.
4644 * The encoder will set avpkt->size to the size of the
4645 * output packet. The returned data (if any) belongs to the
4646 * caller, he is responsible for freeing it.
4648 * If this function fails or produces no output, avpkt will be
4649 * freed using av_free_packet() (i.e. avpkt->destruct will be
4650 * called to free the user supplied buffer).
4651 * @param[in] frame AVFrame containing the raw video data to be encoded.
4652 * May be NULL when flushing an encoder that has the
4653 * CODEC_CAP_DELAY capability set.
4654 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4655 * output packet is non-empty, and to 0 if it is
4656 * empty. If the function returns an error, the
4657 * packet can be assumed to be invalid, and the
4658 * value of got_packet_ptr is undefined and should
4660 * @return 0 on success, negative error code on failure
4662 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4663 const AVFrame *frame, int *got_packet_ptr);
4665 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4666 const AVSubtitle *sub);
4673 #if FF_API_AVCODEC_RESAMPLE
4675 * @defgroup lavc_resample Audio resampling
4677 * @deprecated use libswresample instead
4681 struct ReSampleContext;
4682 struct AVResampleContext;
4684 typedef struct ReSampleContext ReSampleContext;
4687 * Initialize audio resampling context.
4689 * @param output_channels number of output channels
4690 * @param input_channels number of input channels
4691 * @param output_rate output sample rate
4692 * @param input_rate input sample rate
4693 * @param sample_fmt_out requested output sample format
4694 * @param sample_fmt_in input sample format
4695 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4696 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4697 * @param linear if 1 then the used FIR filter will be linearly interpolated
4698 between the 2 closest, if 0 the closest will be used
4699 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4700 * @return allocated ReSampleContext, NULL if error occurred
4702 attribute_deprecated
4703 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4704 int output_rate, int input_rate,
4705 enum AVSampleFormat sample_fmt_out,
4706 enum AVSampleFormat sample_fmt_in,
4707 int filter_length, int log2_phase_count,
4708 int linear, double cutoff);
4710 attribute_deprecated
4711 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4714 * Free resample context.
4716 * @param s a non-NULL pointer to a resample context previously
4717 * created with av_audio_resample_init()
4719 attribute_deprecated
4720 void audio_resample_close(ReSampleContext *s);
4724 * Initialize an audio resampler.
4725 * Note, if either rate is not an integer then simply scale both rates up so they are.
4726 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4727 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4728 * @param linear If 1 then the used FIR filter will be linearly interpolated
4729 between the 2 closest, if 0 the closest will be used
4730 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4732 attribute_deprecated
4733 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4736 * Resample an array of samples using a previously configured context.
4737 * @param src an array of unconsumed samples
4738 * @param consumed the number of samples of src which have been consumed are returned here
4739 * @param src_size the number of unconsumed samples available
4740 * @param dst_size the amount of space in samples available in dst
4741 * @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.
4742 * @return the number of samples written in dst or -1 if an error occurred
4744 attribute_deprecated
4745 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4749 * Compensate samplerate/timestamp drift. The compensation is done by changing
4750 * the resampler parameters, so no audible clicks or similar distortions occur
4751 * @param compensation_distance distance in output samples over which the compensation should be performed
4752 * @param sample_delta number of output samples which should be output less
4754 * example: av_resample_compensate(c, 10, 500)
4755 * here instead of 510 samples only 500 samples would be output
4757 * note, due to rounding the actual compensation might be slightly different,
4758 * especially if the compensation_distance is large and the in_rate used during init is small
4760 attribute_deprecated
4761 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4762 attribute_deprecated
4763 void av_resample_close(struct AVResampleContext *c);
4771 * @addtogroup lavc_picture
4776 * Allocate memory for the pixels of a picture and setup the AVPicture
4779 * Call avpicture_free() to free it.
4781 * @param picture the picture structure to be filled in
4782 * @param pix_fmt the pixel format of the picture
4783 * @param width the width of the picture
4784 * @param height the height of the picture
4785 * @return zero if successful, a negative error code otherwise
4787 * @see av_image_alloc(), avpicture_fill()
4789 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4792 * Free a picture previously allocated by avpicture_alloc().
4793 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4796 * @param picture the AVPicture to be freed
4798 void avpicture_free(AVPicture *picture);
4801 * Setup the picture fields based on the specified image parameters
4802 * and the provided image data buffer.
4804 * The picture fields are filled in by using the image data buffer
4805 * pointed to by ptr.
4807 * If ptr is NULL, the function will fill only the picture linesize
4808 * array and return the required size for the image buffer.
4810 * To allocate an image buffer and fill the picture data in one call,
4811 * use avpicture_alloc().
4813 * @param picture the picture to be filled in
4814 * @param ptr buffer where the image data is stored, or NULL
4815 * @param pix_fmt the pixel format of the image
4816 * @param width the width of the image in pixels
4817 * @param height the height of the image in pixels
4818 * @return the size in bytes required for src, a negative error code
4819 * in case of failure
4821 * @see av_image_fill_arrays()
4823 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4824 enum AVPixelFormat pix_fmt, int width, int height);
4827 * Copy pixel data from an AVPicture into a buffer.
4829 * avpicture_get_size() can be used to compute the required size for
4830 * the buffer to fill.
4832 * @param src source picture with filled data
4833 * @param pix_fmt picture pixel format
4834 * @param width picture width
4835 * @param height picture height
4836 * @param dest destination buffer
4837 * @param dest_size destination buffer size in bytes
4838 * @return the number of bytes written to dest, or a negative value
4839 * (error code) on error, for example if the destination buffer is not
4842 * @see av_image_copy_to_buffer()
4844 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4845 int width, int height,
4846 unsigned char *dest, int dest_size);
4849 * Calculate the size in bytes that a picture of the given width and height
4850 * would occupy if stored in the given picture format.
4852 * @param pix_fmt picture pixel format
4853 * @param width picture width
4854 * @param height picture height
4855 * @return the computed picture buffer size or a negative error code
4858 * @see av_image_get_buffer_size().
4860 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4862 #if FF_API_DEINTERLACE
4864 * deinterlace - if not supported return -1
4866 * @deprecated - use yadif (in libavfilter) instead
4868 attribute_deprecated
4869 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4870 enum AVPixelFormat pix_fmt, int width, int height);
4873 * Copy image src to dst. Wraps av_image_copy().
4875 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4876 enum AVPixelFormat pix_fmt, int width, int height);
4879 * Crop image top and left side.
4881 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4882 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4887 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4888 int padtop, int padbottom, int padleft, int padright, int *color);
4895 * @defgroup lavc_misc Utility functions
4898 * Miscellaneous utility functions related to both encoding and decoding
4904 * @defgroup lavc_misc_pixfmt Pixel formats
4906 * Functions for working with pixel formats.
4911 * Utility function to access log2_chroma_w log2_chroma_h from
4912 * the pixel format AVPixFmtDescriptor.
4914 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4915 * for one that returns a failure code and continues in case of invalid
4918 * @param[in] pix_fmt the pixel format
4919 * @param[out] h_shift store log2_chroma_w
4920 * @param[out] v_shift store log2_chroma_h
4922 * @see av_pix_fmt_get_chroma_sub_sample
4925 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4928 * Return a value representing the fourCC code associated to the
4929 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4932 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4935 * @deprecated see av_get_pix_fmt_loss()
4937 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4941 * Find the best pixel format to convert to given a certain source pixel
4942 * format. When converting from one pixel format to another, information loss
4943 * may occur. For example, when converting from RGB24 to GRAY, the color
4944 * information will be lost. Similarly, other losses occur when converting from
4945 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4946 * the given pixel formats should be used to suffer the least amount of loss.
4947 * The pixel formats from which it chooses one, are determined by the
4948 * pix_fmt_list parameter.
4951 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4952 * @param[in] src_pix_fmt source pixel format
4953 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4954 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4955 * @return The best pixel format to convert to or -1 if none was found.
4957 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4958 enum AVPixelFormat src_pix_fmt,
4959 int has_alpha, int *loss_ptr);
4962 * @deprecated see av_find_best_pix_fmt_of_2()
4964 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4965 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4967 attribute_deprecated
4968 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4969 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4970 enum AVPixelFormat src_pix_fmt,
4971 int has_alpha, int *loss_ptr);
4973 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4974 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4978 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4984 #if FF_API_SET_DIMENSIONS
4986 * @deprecated this function is not supposed to be used from outside of lavc
4988 attribute_deprecated
4989 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4993 * Put a string representing the codec tag codec_tag in buf.
4995 * @param buf buffer to place codec tag in
4996 * @param buf_size size in bytes of buf
4997 * @param codec_tag codec tag to assign
4998 * @return the length of the string that would have been generated if
4999 * enough space had been available, excluding the trailing null
5001 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5003 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5006 * Return a name for the specified profile, if available.
5008 * @param codec the codec that is searched for the given profile
5009 * @param profile the profile value for which a name is requested
5010 * @return A name for the profile if found, NULL otherwise.
5012 const char *av_get_profile_name(const AVCodec *codec, int profile);
5014 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5015 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5016 //FIXME func typedef
5019 * Fill AVFrame audio data and linesize pointers.
5021 * The buffer buf must be a preallocated buffer with a size big enough
5022 * to contain the specified samples amount. The filled AVFrame data
5023 * pointers will point to this buffer.
5025 * AVFrame extended_data channel pointers are allocated if necessary for
5028 * @param frame the AVFrame
5029 * frame->nb_samples must be set prior to calling the
5030 * function. This function fills in frame->data,
5031 * frame->extended_data, frame->linesize[0].
5032 * @param nb_channels channel count
5033 * @param sample_fmt sample format
5034 * @param buf buffer to use for frame data
5035 * @param buf_size size of buffer
5036 * @param align plane size sample alignment (0 = default)
5037 * @return >=0 on success, negative error code on failure
5038 * @todo return the size in bytes required to store the samples in
5039 * case of success, at the next libavutil bump
5041 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5042 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5043 int buf_size, int align);
5046 * Reset the internal decoder state / flush internal buffers. Should be called
5047 * e.g. when seeking or when switching to a different stream.
5049 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5050 * this invalidates the frames previously returned from the decoder. When
5051 * refcounted frames are used, the decoder just releases any references it might
5052 * keep internally, but the caller's reference remains valid.
5054 void avcodec_flush_buffers(AVCodecContext *avctx);
5057 * Return codec bits per sample.
5059 * @param[in] codec_id the codec
5060 * @return Number of bits per sample or zero if unknown for the given codec.
5062 int av_get_bits_per_sample(enum AVCodecID codec_id);
5065 * Return the PCM codec associated with a sample format.
5066 * @param be endianness, 0 for little, 1 for big,
5067 * -1 (or anything else) for native
5068 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5070 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5073 * Return codec bits per sample.
5074 * Only return non-zero if the bits per sample is exactly correct, not an
5077 * @param[in] codec_id the codec
5078 * @return Number of bits per sample or zero if unknown for the given codec.
5080 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5083 * Return audio frame duration.
5085 * @param avctx codec context
5086 * @param frame_bytes size of the frame, or 0 if unknown
5087 * @return frame duration, in samples, if known. 0 if not able to
5090 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5093 typedef struct AVBitStreamFilterContext {
5095 struct AVBitStreamFilter *filter;
5096 AVCodecParserContext *parser;
5097 struct AVBitStreamFilterContext *next;
5098 } AVBitStreamFilterContext;
5101 typedef struct AVBitStreamFilter {
5104 int (*filter)(AVBitStreamFilterContext *bsfc,
5105 AVCodecContext *avctx, const char *args,
5106 uint8_t **poutbuf, int *poutbuf_size,
5107 const uint8_t *buf, int buf_size, int keyframe);
5108 void (*close)(AVBitStreamFilterContext *bsfc);
5109 struct AVBitStreamFilter *next;
5110 } AVBitStreamFilter;
5113 * Register a bitstream filter.
5115 * The filter will be accessible to the application code through
5116 * av_bitstream_filter_next() or can be directly initialized with
5117 * av_bitstream_filter_init().
5119 * @see avcodec_register_all()
5121 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5124 * Create and initialize a bitstream filter context given a bitstream
5127 * The returned context must be freed with av_bitstream_filter_close().
5129 * @param name the name of the bitstream filter
5130 * @return a bitstream filter context if a matching filter was found
5131 * and successfully initialized, NULL otherwise
5133 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5138 * This function filters the buffer buf with size buf_size, and places the
5139 * filtered buffer in the buffer pointed to by poutbuf.
5141 * The output buffer must be freed by the caller.
5143 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5144 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5145 * If specified, this must point to the encoder context of the
5146 * output stream the packet is sent to.
5147 * @param args arguments which specify the filter configuration, may be NULL
5148 * @param poutbuf pointer which is updated to point to the filtered buffer
5149 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5150 * @param buf buffer containing the data to filter
5151 * @param buf_size size in bytes of buf
5152 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5153 * @return >= 0 in case of success, or a negative error code in case of failure
5155 * If the return value is positive, an output buffer is allocated and
5156 * is available in *poutbuf, and is distinct from the input buffer.
5158 * If the return value is 0, the output buffer is not allocated and
5159 * should be considered identical to the input buffer, or in case
5160 * *poutbuf was set it points to the input buffer (not necessarily to
5161 * its starting address).
5163 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5164 AVCodecContext *avctx, const char *args,
5165 uint8_t **poutbuf, int *poutbuf_size,
5166 const uint8_t *buf, int buf_size, int keyframe);
5169 * Release bitstream filter context.
5171 * @param bsf the bitstream filter context created with
5172 * av_bitstream_filter_init(), can be NULL
5174 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5177 * If f is NULL, return the first registered bitstream filter,
5178 * if f is non-NULL, return the next registered bitstream filter
5179 * after f, or NULL if f is the last one.
5181 * This function can be used to iterate over all registered bitstream
5184 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5189 * Same behaviour av_fast_malloc but the buffer has additional
5190 * FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5192 * In addition the whole buffer will initially and after resizes
5193 * be 0-initialized so that no uninitialized data will ever appear.
5195 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5198 * Same behaviour av_fast_padded_malloc except that buffer will always
5199 * be 0-initialized after call.
5201 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5204 * Encode extradata length to a buffer. Used by xiph codecs.
5206 * @param s buffer to write to; must be at least (v/255+1) bytes long
5207 * @param v size of extradata in bytes
5208 * @return number of bytes written to the buffer.
5210 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5212 #if FF_API_MISSING_SAMPLE
5214 * Log a generic warning message about a missing feature. This function is
5215 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5216 * only, and would normally not be used by applications.
5217 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5218 * a pointer to an AVClass struct
5219 * @param[in] feature string containing the name of the missing feature
5220 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5221 * If want_sample is non-zero, additional verbage will be added to the log
5222 * message which tells the user how to report samples to the development
5224 * @deprecated Use avpriv_report_missing_feature() instead.
5226 attribute_deprecated
5227 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5230 * Log a generic warning message asking for a sample. This function is
5231 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5232 * only, and would normally not be used by applications.
5233 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5234 * a pointer to an AVClass struct
5235 * @param[in] msg string containing an optional message, or NULL if no message
5236 * @deprecated Use avpriv_request_sample() instead.
5238 attribute_deprecated
5239 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5240 #endif /* FF_API_MISSING_SAMPLE */
5243 * Register the hardware accelerator hwaccel.
5245 void av_register_hwaccel(AVHWAccel *hwaccel);
5248 * If hwaccel is NULL, returns the first registered hardware accelerator,
5249 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5250 * after hwaccel, or NULL if hwaccel is the last one.
5252 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5256 * Lock operation used by lockmgr
5259 AV_LOCK_CREATE, ///< Create a mutex
5260 AV_LOCK_OBTAIN, ///< Lock the mutex
5261 AV_LOCK_RELEASE, ///< Unlock the mutex
5262 AV_LOCK_DESTROY, ///< Free mutex resources
5266 * Register a user provided lock manager supporting the operations
5267 * specified by AVLockOp. The "mutex" argument to the function points
5268 * to a (void *) where the lockmgr should store/get a pointer to a user
5269 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5270 * value left by the last call for all other ops. If the lock manager is
5271 * unable to perform the op then it should leave the mutex in the same
5272 * state as when it was called and return a non-zero value. However,
5273 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5274 * have been successfully destroyed. If av_lockmgr_register succeeds
5275 * it will return a non-negative value, if it fails it will return a
5276 * negative value and destroy all mutex and unregister all callbacks.
5277 * av_lockmgr_register is not thread-safe, it must be called from a
5278 * single thread before any calls which make use of locking are used.
5280 * @param cb User defined callback. av_lockmgr_register invokes calls
5281 * to this callback and the previously registered callback.
5282 * The callback will be used to create more than one mutex
5283 * each of which must be backed by its own underlying locking
5284 * mechanism (i.e. do not use a single static object to
5285 * implement your lock manager). If cb is set to NULL the
5286 * lockmgr will be unregistered.
5288 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5291 * Get the type of the given codec.
5293 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5296 * Get the name of a codec.
5297 * @return a static string identifying the codec; never NULL
5299 const char *avcodec_get_name(enum AVCodecID id);
5302 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5303 * with no corresponding avcodec_close()), 0 otherwise.
5305 int avcodec_is_open(AVCodecContext *s);
5308 * @return a non-zero number if codec is an encoder, zero otherwise
5310 int av_codec_is_encoder(const AVCodec *codec);
5313 * @return a non-zero number if codec is a decoder, zero otherwise
5315 int av_codec_is_decoder(const AVCodec *codec);
5318 * @return descriptor for given codec ID or NULL if no descriptor exists.
5320 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5323 * Iterate over all codec descriptors known to libavcodec.
5325 * @param prev previous descriptor. NULL to get the first descriptor.
5327 * @return next descriptor or NULL after the last descriptor
5329 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5332 * @return codec descriptor with the given name or NULL if no such descriptor
5335 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5341 #endif /* AVCODEC_AVCODEC_H */