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,
296 AV_CODEC_ID_BRENDER_PIX= MKBETAG('B','P','I','X'),
297 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
298 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
299 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
300 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
302 AV_CODEC_ID_012V = MKBETAG('0','1','2','V'),
303 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
304 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
305 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
306 AV_CODEC_ID_TARGA_Y216 = MKBETAG('T','2','1','6'),
307 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
308 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
309 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
310 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
311 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
312 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
313 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
314 AV_CODEC_ID_XFACE = MKBETAG('X','F','A','C'),
315 AV_CODEC_ID_SGIRLE = MKBETAG('S','G','I','R'),
316 AV_CODEC_ID_MVC1 = MKBETAG('M','V','C','1'),
317 AV_CODEC_ID_MVC2 = MKBETAG('M','V','C','2'),
318 AV_CODEC_ID_SNOW = MKBETAG('S','N','O','W'),
319 AV_CODEC_ID_WEBP = MKBETAG('W','E','B','P'),
320 AV_CODEC_ID_SMVJPEG = MKBETAG('S','M','V','J'),
321 AV_CODEC_ID_HEVC = MKBETAG('H','2','6','5'),
322 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
323 AV_CODEC_ID_VP7 = MKBETAG('V','P','7','0'),
324 AV_CODEC_ID_APNG = MKBETAG('A','P','N','G'),
326 /* various PCM "codecs" */
327 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
328 AV_CODEC_ID_PCM_S16LE = 0x10000,
329 AV_CODEC_ID_PCM_S16BE,
330 AV_CODEC_ID_PCM_U16LE,
331 AV_CODEC_ID_PCM_U16BE,
334 AV_CODEC_ID_PCM_MULAW,
335 AV_CODEC_ID_PCM_ALAW,
336 AV_CODEC_ID_PCM_S32LE,
337 AV_CODEC_ID_PCM_S32BE,
338 AV_CODEC_ID_PCM_U32LE,
339 AV_CODEC_ID_PCM_U32BE,
340 AV_CODEC_ID_PCM_S24LE,
341 AV_CODEC_ID_PCM_S24BE,
342 AV_CODEC_ID_PCM_U24LE,
343 AV_CODEC_ID_PCM_U24BE,
344 AV_CODEC_ID_PCM_S24DAUD,
345 AV_CODEC_ID_PCM_ZORK,
346 AV_CODEC_ID_PCM_S16LE_PLANAR,
348 AV_CODEC_ID_PCM_F32BE,
349 AV_CODEC_ID_PCM_F32LE,
350 AV_CODEC_ID_PCM_F64BE,
351 AV_CODEC_ID_PCM_F64LE,
352 AV_CODEC_ID_PCM_BLURAY,
355 AV_CODEC_ID_PCM_S8_PLANAR,
356 AV_CODEC_ID_PCM_S24LE_PLANAR_DEPRECATED,
357 AV_CODEC_ID_PCM_S32LE_PLANAR_DEPRECATED,
358 AV_CODEC_ID_PCM_S24LE_PLANAR = MKBETAG(24,'P','S','P'),
359 AV_CODEC_ID_PCM_S32LE_PLANAR = MKBETAG(32,'P','S','P'),
360 AV_CODEC_ID_PCM_S16BE_PLANAR = MKBETAG('P','S','P',16),
362 /* various ADPCM codecs */
363 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
364 AV_CODEC_ID_ADPCM_IMA_WAV,
365 AV_CODEC_ID_ADPCM_IMA_DK3,
366 AV_CODEC_ID_ADPCM_IMA_DK4,
367 AV_CODEC_ID_ADPCM_IMA_WS,
368 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
369 AV_CODEC_ID_ADPCM_MS,
370 AV_CODEC_ID_ADPCM_4XM,
371 AV_CODEC_ID_ADPCM_XA,
372 AV_CODEC_ID_ADPCM_ADX,
373 AV_CODEC_ID_ADPCM_EA,
374 AV_CODEC_ID_ADPCM_G726,
375 AV_CODEC_ID_ADPCM_CT,
376 AV_CODEC_ID_ADPCM_SWF,
377 AV_CODEC_ID_ADPCM_YAMAHA,
378 AV_CODEC_ID_ADPCM_SBPRO_4,
379 AV_CODEC_ID_ADPCM_SBPRO_3,
380 AV_CODEC_ID_ADPCM_SBPRO_2,
381 AV_CODEC_ID_ADPCM_THP,
382 AV_CODEC_ID_ADPCM_IMA_AMV,
383 AV_CODEC_ID_ADPCM_EA_R1,
384 AV_CODEC_ID_ADPCM_EA_R3,
385 AV_CODEC_ID_ADPCM_EA_R2,
386 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
387 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
388 AV_CODEC_ID_ADPCM_EA_XAS,
389 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
390 AV_CODEC_ID_ADPCM_IMA_ISS,
391 AV_CODEC_ID_ADPCM_G722,
392 AV_CODEC_ID_ADPCM_IMA_APC,
393 AV_CODEC_ID_ADPCM_VIMA_DEPRECATED,
394 AV_CODEC_ID_ADPCM_VIMA = MKBETAG('V','I','M','A'),
395 #if FF_API_VIMA_DECODER
396 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
398 AV_CODEC_ID_ADPCM_AFC = MKBETAG('A','F','C',' '),
399 AV_CODEC_ID_ADPCM_IMA_OKI = MKBETAG('O','K','I',' '),
400 AV_CODEC_ID_ADPCM_DTK = MKBETAG('D','T','K',' '),
401 AV_CODEC_ID_ADPCM_IMA_RAD = MKBETAG('R','A','D',' '),
402 AV_CODEC_ID_ADPCM_G726LE = MKBETAG('6','2','7','G'),
405 AV_CODEC_ID_AMR_NB = 0x12000,
408 /* RealAudio codecs*/
409 AV_CODEC_ID_RA_144 = 0x13000,
412 /* various DPCM codecs */
413 AV_CODEC_ID_ROQ_DPCM = 0x14000,
414 AV_CODEC_ID_INTERPLAY_DPCM,
415 AV_CODEC_ID_XAN_DPCM,
416 AV_CODEC_ID_SOL_DPCM,
419 AV_CODEC_ID_MP2 = 0x15000,
420 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
430 AV_CODEC_ID_VMDAUDIO,
436 AV_CODEC_ID_WESTWOOD_SND1,
437 AV_CODEC_ID_GSM, ///< as in Berlin toast format
440 AV_CODEC_ID_TRUESPEECH,
442 AV_CODEC_ID_SMACKAUDIO,
445 AV_CODEC_ID_DSICINAUDIO,
447 AV_CODEC_ID_MUSEPACK7,
449 AV_CODEC_ID_GSM_MS, /* as found in WAV */
455 AV_CODEC_ID_NELLYMOSER,
456 AV_CODEC_ID_MUSEPACK8,
458 AV_CODEC_ID_WMAVOICE,
460 AV_CODEC_ID_WMALOSSLESS,
469 AV_CODEC_ID_BINKAUDIO_RDFT,
470 AV_CODEC_ID_BINKAUDIO_DCT,
471 AV_CODEC_ID_AAC_LATM,
476 AV_CODEC_ID_8SVX_EXP,
477 AV_CODEC_ID_8SVX_FIB,
478 AV_CODEC_ID_BMV_AUDIO,
482 AV_CODEC_ID_OPUS_DEPRECATED,
483 AV_CODEC_ID_COMFORT_NOISE,
484 AV_CODEC_ID_TAK_DEPRECATED,
485 AV_CODEC_ID_METASOUND,
486 AV_CODEC_ID_PAF_AUDIO_DEPRECATED,
489 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
490 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
491 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
492 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
493 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
494 AV_CODEC_ID_TAK = MKBETAG('t','B','a','K'),
495 AV_CODEC_ID_EVRC = MKBETAG('s','e','v','c'),
496 AV_CODEC_ID_SMV = MKBETAG('s','s','m','v'),
497 AV_CODEC_ID_DSD_LSBF = MKBETAG('D','S','D','L'),
498 AV_CODEC_ID_DSD_MSBF = MKBETAG('D','S','D','M'),
499 AV_CODEC_ID_DSD_LSBF_PLANAR = MKBETAG('D','S','D','1'),
500 AV_CODEC_ID_DSD_MSBF_PLANAR = MKBETAG('D','S','D','8'),
502 /* subtitle codecs */
503 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
504 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
505 AV_CODEC_ID_DVB_SUBTITLE,
506 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
509 AV_CODEC_ID_MOV_TEXT,
510 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
511 AV_CODEC_ID_DVB_TELETEXT,
513 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
514 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
515 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
516 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
517 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
518 AV_CODEC_ID_STL = MKBETAG('S','p','T','L'),
519 AV_CODEC_ID_SUBVIEWER1 = MKBETAG('S','b','V','1'),
520 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
521 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
522 AV_CODEC_ID_WEBVTT = MKBETAG('W','V','T','T'),
523 AV_CODEC_ID_MPL2 = MKBETAG('M','P','L','2'),
524 AV_CODEC_ID_VPLAYER = MKBETAG('V','P','l','r'),
525 AV_CODEC_ID_PJS = MKBETAG('P','h','J','S'),
526 AV_CODEC_ID_ASS = MKBETAG('A','S','S',' '), ///< ASS as defined in Matroska
528 /* other specific kind of codecs (generally used for attachments) */
529 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
530 AV_CODEC_ID_TTF = 0x18000,
531 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
532 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
533 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
534 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
535 AV_CODEC_ID_SMPTE_KLV = MKBETAG('K','L','V','A'),
536 AV_CODEC_ID_DVD_NAV = MKBETAG('D','N','A','V'),
537 AV_CODEC_ID_TIMED_ID3 = MKBETAG('T','I','D','3'),
538 AV_CODEC_ID_BIN_DATA = MKBETAG('D','A','T','A'),
541 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
543 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
544 * stream (only used by libavformat) */
545 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
546 * stream (only used by libavformat) */
547 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
550 #include "old_codec_ids.h"
555 * This struct describes the properties of a single codec described by an
557 * @see avcodec_descriptor_get()
559 typedef struct AVCodecDescriptor {
561 enum AVMediaType type;
563 * Name of the codec described by this descriptor. It is non-empty and
564 * unique for each codec descriptor. It should contain alphanumeric
565 * characters and '_' only.
569 * A more descriptive name for this codec. May be NULL.
571 const char *long_name;
573 * Codec properties, a combination of AV_CODEC_PROP_* flags.
578 * MIME type(s) associated with the codec.
579 * May be NULL; if not, a NULL-terminated array of MIME types.
580 * The first item is always non-NULL and is the preferred MIME type.
582 const char *const *mime_types;
586 * Codec uses only intra compression.
589 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
591 * Codec supports lossy compression. Audio and video codecs only.
592 * @note a codec may support both lossy and lossless
595 #define AV_CODEC_PROP_LOSSY (1 << 1)
597 * Codec supports lossless compression. Audio and video codecs only.
599 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
601 * Codec supports frame reordering. That is, the coded order (the order in which
602 * the encoded packets are output by the encoders / stored / input to the
603 * decoders) may be different from the presentation order of the corresponding
606 * For codecs that do not have this property set, PTS and DTS should always be
609 #define AV_CODEC_PROP_REORDER (1 << 3)
611 * Subtitle codec is bitmap based
612 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
614 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
616 * Subtitle codec is text based.
617 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
619 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
622 * @ingroup lavc_decoding
623 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
624 * This is mainly needed because some optimized bitstream readers read
625 * 32 or 64 bit at once and could read over the end.<br>
626 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
627 * MPEG bitstreams could cause overread and segfault.
629 #define FF_INPUT_BUFFER_PADDING_SIZE 32
632 * @ingroup lavc_encoding
633 * minimum encoding buffer size
634 * Used to avoid some checks during header writing.
636 #define FF_MIN_BUFFER_SIZE 16384
640 * @ingroup lavc_encoding
641 * motion estimation type.
644 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
648 ME_EPZS, ///< enhanced predictive zonal search
649 ME_X1, ///< reserved for experiments
650 ME_HEX, ///< hexagon based search
651 ME_UMH, ///< uneven multi-hexagon search
652 ME_TESA, ///< transformed exhaustive search algorithm
653 ME_ITER=50, ///< iterative search
657 * @ingroup lavc_decoding
660 /* We leave some space between them for extensions (drop some
661 * keyframes for intra-only or drop just some bidir frames). */
662 AVDISCARD_NONE =-16, ///< discard nothing
663 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
664 AVDISCARD_NONREF = 8, ///< discard all non reference
665 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
666 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
667 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
668 AVDISCARD_ALL = 48, ///< discard all
671 enum AVAudioServiceType {
672 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
673 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
674 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
675 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
676 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
677 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
678 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
679 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
680 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
681 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
685 * @ingroup lavc_encoding
687 typedef struct RcOverride{
690 int qscale; // If this is 0 then quality_factor will be used instead.
691 float quality_factor;
694 #if FF_API_MAX_BFRAMES
696 * @deprecated there is no libavcodec-wide limit on the number of B-frames
698 #define FF_MAX_B_FRAMES 16
702 These flags can be passed in AVCodecContext.flags before initialization.
703 Note: Not everything is supported yet.
707 * Allow decoders to produce frames with data planes that are not aligned
708 * to CPU requirements (e.g. due to cropping).
710 #define CODEC_FLAG_UNALIGNED 0x0001
711 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
712 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
713 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
714 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
717 * @deprecated use the "gmc" private option of the libxvid encoder
719 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
723 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
726 #define CODEC_FLAG_MV0 0x0040
728 #if FF_API_INPUT_PRESERVED
730 * @deprecated passing reference-counted frames to the encoders replaces this
733 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
735 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
736 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
737 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
740 * @deprecated edges are not used/required anymore. I.e. this flag is now always
743 #define CODEC_FLAG_EMU_EDGE 0x4000
745 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
746 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
747 location instead of only at frame boundaries. */
748 #if FF_API_NORMALIZE_AQP
750 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
753 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
755 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
756 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
757 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
758 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
759 /* Fx : Flag for h263+ extra options */
760 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
761 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
762 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
763 #define CODEC_FLAG_CLOSED_GOP 0x80000000
764 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
765 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
766 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
767 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
768 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
770 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
771 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
772 #define CODEC_FLAG2_EXPORT_MVS 0x10000000 ///< Export motion vectors through frame side data
773 #define CODEC_FLAG2_SKIP_MANUAL 0x20000000 ///< Do not skip samples and export skip information as frame side data
775 /* Unsupported options :
776 * Syntax Arithmetic coding (SAC)
777 * Reference Picture Selection
778 * Independent Segment Decoding */
780 /* codec capabilities */
782 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
784 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
785 * If not set, it might not use get_buffer() at all or use operations that
786 * assume the buffer was allocated by avcodec_default_get_buffer.
788 #define CODEC_CAP_DR1 0x0002
789 #define CODEC_CAP_TRUNCATED 0x0008
791 /* Codec can export data for HW decoding. This flag indicates that
792 * the codec would call get_format() with list that might contain HW accelerated
793 * pixel formats (XvMC, VDPAU, VAAPI, etc). The application can pick any of them
794 * including raw image format.
795 * The application can use the passed context to determine bitstream version,
796 * chroma format, resolution etc.
798 #define CODEC_CAP_HWACCEL 0x0010
799 #endif /* FF_API_XVMC */
801 * Encoder or decoder requires flushing with NULL input at the end in order to
802 * give the complete and correct output.
804 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
805 * with NULL data. The user can still send NULL data to the public encode
806 * or decode function, but libavcodec will not pass it along to the codec
807 * unless this flag is set.
810 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
811 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
815 * The encoder needs to be fed with NULL data at the end of encoding until the
816 * encoder no longer returns data.
818 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
819 * flag also means that the encoder must set the pts and duration for
820 * each output packet. If this flag is not set, the pts and duration will
821 * be determined by libavcodec from the input frame.
823 #define CODEC_CAP_DELAY 0x0020
825 * Codec can be fed a final frame with a smaller size.
826 * This can be used to prevent truncation of the last audio samples.
828 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
831 * Codec can export data for HW decoding (VDPAU).
833 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
836 * Codec can output multiple frames per AVPacket
837 * Normally demuxers return one frame at a time, demuxers which do not do
838 * are connected to a parser to split what they return into proper frames.
839 * This flag is reserved to the very rare category of codecs which have a
840 * bitstream that cannot be split into frames without timeconsuming
841 * operations like full decoding. Demuxers carring such bitstreams thus
842 * may return multiple frames in a packet. This has many disadvantages like
843 * prohibiting stream copy in many cases thus it should only be considered
846 #define CODEC_CAP_SUBFRAMES 0x0100
848 * Codec is experimental and is thus avoided in favor of non experimental
851 #define CODEC_CAP_EXPERIMENTAL 0x0200
853 * Codec should fill in channel configuration and samplerate instead of container
855 #define CODEC_CAP_CHANNEL_CONF 0x0400
856 #if FF_API_NEG_LINESIZES
858 * @deprecated no codecs use this capability
860 #define CODEC_CAP_NEG_LINESIZES 0x0800
863 * Codec supports frame-level multithreading.
865 #define CODEC_CAP_FRAME_THREADS 0x1000
867 * Codec supports slice-based (or partition-based) multithreading.
869 #define CODEC_CAP_SLICE_THREADS 0x2000
871 * Codec supports changed parameters at any point.
873 #define CODEC_CAP_PARAM_CHANGE 0x4000
875 * Codec supports avctx->thread_count == 0 (auto).
877 #define CODEC_CAP_AUTO_THREADS 0x8000
879 * Audio encoder supports receiving a different number of samples in each call.
881 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
883 * Codec is intra only.
885 #define CODEC_CAP_INTRA_ONLY 0x40000000
889 #define CODEC_CAP_LOSSLESS 0x80000000
892 //The following defines may change, don't expect compatibility if you use them.
893 #define MB_TYPE_INTRA4x4 0x0001
894 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
895 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
896 #define MB_TYPE_16x16 0x0008
897 #define MB_TYPE_16x8 0x0010
898 #define MB_TYPE_8x16 0x0020
899 #define MB_TYPE_8x8 0x0040
900 #define MB_TYPE_INTERLACED 0x0080
901 #define MB_TYPE_DIRECT2 0x0100 //FIXME
902 #define MB_TYPE_ACPRED 0x0200
903 #define MB_TYPE_GMC 0x0400
904 #define MB_TYPE_SKIP 0x0800
905 #define MB_TYPE_P0L0 0x1000
906 #define MB_TYPE_P1L0 0x2000
907 #define MB_TYPE_P0L1 0x4000
908 #define MB_TYPE_P1L1 0x8000
909 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
910 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
911 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
912 #define MB_TYPE_QUANT 0x00010000
913 #define MB_TYPE_CBP 0x00020000
914 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
919 * This specifies the area which should be displayed.
920 * Note there may be multiple such areas for one frame.
922 typedef struct AVPanScan{
925 * - encoding: Set by user.
926 * - decoding: Set by libavcodec.
931 * width and height in 1/16 pel
932 * - encoding: Set by user.
933 * - decoding: Set by libavcodec.
939 * position of the top left corner in 1/16 pel for up to 3 fields/frames
940 * - encoding: Set by user.
941 * - decoding: Set by libavcodec.
943 int16_t position[3][2];
946 #if FF_API_QSCALE_TYPE
947 #define FF_QSCALE_TYPE_MPEG1 0
948 #define FF_QSCALE_TYPE_MPEG2 1
949 #define FF_QSCALE_TYPE_H264 2
950 #define FF_QSCALE_TYPE_VP56 3
953 #if FF_API_GET_BUFFER
954 #define FF_BUFFER_TYPE_INTERNAL 1
955 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
956 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
957 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
959 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
960 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
961 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
962 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
966 * The decoder will keep a reference to the frame and may reuse it later.
968 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
971 * @defgroup lavc_packet AVPacket
973 * Types and functions for working with AVPacket.
976 enum AVPacketSideDataType {
978 AV_PKT_DATA_NEW_EXTRADATA,
981 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
984 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
985 * s32le channel_count
986 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
987 * u64le channel_layout
988 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
990 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
995 AV_PKT_DATA_PARAM_CHANGE,
998 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
999 * structures with info about macroblocks relevant to splitting the
1000 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1001 * That is, it does not necessarily contain info about all macroblocks,
1002 * as long as the distance between macroblocks in the info is smaller
1003 * than the target payload size.
1004 * Each MB info structure is 12 bytes, and is laid out as follows:
1006 * u32le bit offset from the start of the packet
1007 * u8 current quantizer at the start of the macroblock
1009 * u16le macroblock address within the GOB
1010 * u8 horizontal MV predictor
1011 * u8 vertical MV predictor
1012 * u8 horizontal MV predictor for block number 3
1013 * u8 vertical MV predictor for block number 3
1016 AV_PKT_DATA_H263_MB_INFO,
1019 * This side data should be associated with an audio stream and contains
1020 * ReplayGain information in form of the AVReplayGain struct.
1022 AV_PKT_DATA_REPLAYGAIN,
1025 * This side data contains a 3x3 transformation matrix describing an affine
1026 * transformation that needs to be applied to the decoded video frames for
1027 * correct presentation.
1029 * See libavutil/display.h for a detailed description of the data.
1031 AV_PKT_DATA_DISPLAYMATRIX,
1034 * This side data should be associated with a video stream and contains
1035 * Stereoscopic 3D information in form of the AVStereo3D struct.
1037 AV_PKT_DATA_STEREO3D,
1040 * This side data should be associated with an audio stream and corresponds
1041 * to enum AVAudioServiceType.
1043 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1046 * Recommmends skipping the specified number of samples
1048 * u32le number of samples to skip from start of this packet
1049 * u32le number of samples to skip from end of this packet
1050 * u8 reason for start skip
1051 * u8 reason for end skip (0=padding silence, 1=convergence)
1054 AV_PKT_DATA_SKIP_SAMPLES=70,
1057 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1058 * the packet may contain "dual mono" audio specific to Japanese DTV
1059 * and if it is true, recommends only the selected channel to be used.
1061 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1064 AV_PKT_DATA_JP_DUALMONO,
1067 * A list of zero terminated key/value strings. There is no end marker for
1068 * the list, so it is required to rely on the side data size to stop.
1070 AV_PKT_DATA_STRINGS_METADATA,
1073 * Subtitle event position
1081 AV_PKT_DATA_SUBTITLE_POSITION,
1084 * Data found in BlockAdditional element of matroska container. There is
1085 * no end marker for the data, so it is required to rely on the side data
1086 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1089 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1092 * The optional first identifier line of a WebVTT cue.
1094 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1097 * The optional settings (rendering instructions) that immediately
1098 * follow the timestamp specifier of a WebVTT cue.
1100 AV_PKT_DATA_WEBVTT_SETTINGS,
1103 * A list of zero terminated key/value strings. There is no end marker for
1104 * the list, so it is required to rely on the side data size to stop. This
1105 * side data includes updated metadata which appeared in the stream.
1107 AV_PKT_DATA_METADATA_UPDATE,
1110 typedef struct AVPacketSideData {
1113 enum AVPacketSideDataType type;
1117 * This structure stores compressed data. It is typically exported by demuxers
1118 * and then passed as input to decoders, or received as output from encoders and
1119 * then passed to muxers.
1121 * For video, it should typically contain one compressed frame. For audio it may
1122 * contain several compressed frames.
1124 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1125 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1126 * without libavcodec and libavformat major bump.
1128 * The semantics of data ownership depends on the buf or destruct (deprecated)
1129 * fields. If either is set, the packet data is dynamically allocated and is
1130 * valid indefinitely until av_free_packet() is called (which in turn calls
1131 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
1132 * the packet data is typically backed by some static buffer somewhere and is
1133 * only valid for a limited time (e.g. until the next read call when demuxing).
1135 * The side data is always allocated with av_malloc() and is freed in
1138 typedef struct AVPacket {
1140 * A reference to the reference-counted buffer where the packet data is
1142 * May be NULL, then the packet data is not reference-counted.
1146 * Presentation timestamp in AVStream->time_base units; the time at which
1147 * the decompressed packet will be presented to the user.
1148 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1149 * pts MUST be larger or equal to dts as presentation cannot happen before
1150 * decompression, unless one wants to view hex dumps. Some formats misuse
1151 * the terms dts and pts/cts to mean something different. Such timestamps
1152 * must be converted to true pts/dts before they are stored in AVPacket.
1156 * Decompression timestamp in AVStream->time_base units; the time at which
1157 * the packet is decompressed.
1158 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1165 * A combination of AV_PKT_FLAG values
1169 * Additional packet data that can be provided by the container.
1170 * Packet can contain several types of side information.
1172 AVPacketSideData *side_data;
1173 int side_data_elems;
1176 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1177 * Equals next_pts - this_pts in presentation order.
1180 #if FF_API_DESTRUCT_PACKET
1181 attribute_deprecated
1182 void (*destruct)(struct AVPacket *);
1183 attribute_deprecated
1186 int64_t pos; ///< byte position in stream, -1 if unknown
1189 * Time difference in AVStream->time_base units from the pts of this
1190 * packet to the point at which the output from the decoder has converged
1191 * independent from the availability of previous frames. That is, the
1192 * frames are virtually identical no matter if decoding started from
1193 * the very first frame or from this keyframe.
1194 * Is AV_NOPTS_VALUE if unknown.
1195 * This field is not the display duration of the current packet.
1196 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1199 * The purpose of this field is to allow seeking in streams that have no
1200 * keyframes in the conventional sense. It corresponds to the
1201 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1202 * essential for some types of subtitle streams to ensure that all
1203 * subtitles are correctly displayed after seeking.
1205 int64_t convergence_duration;
1207 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1208 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1210 enum AVSideDataParamChangeFlags {
1211 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1212 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1213 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1214 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1220 struct AVCodecInternal;
1224 AV_FIELD_PROGRESSIVE,
1225 AV_FIELD_TT, //< Top coded_first, top displayed first
1226 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1227 AV_FIELD_TB, //< Top coded first, bottom displayed first
1228 AV_FIELD_BT, //< Bottom coded first, top displayed first
1232 * main external API structure.
1233 * New fields can be added to the end with minor version bumps.
1234 * Removal, reordering and changes to existing fields require a major
1236 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1238 * sizeof(AVCodecContext) must not be used outside libav*.
1240 typedef struct AVCodecContext {
1242 * information on struct for av_log
1243 * - set by avcodec_alloc_context3
1245 const AVClass *av_class;
1246 int log_level_offset;
1248 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1249 const struct AVCodec *codec;
1250 #if FF_API_CODEC_NAME
1252 * @deprecated this field is not used for anything in libavcodec
1254 attribute_deprecated
1255 char codec_name[32];
1257 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1260 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1261 * This is used to work around some encoder bugs.
1262 * A demuxer should set this to what is stored in the field used to identify the codec.
1263 * If there are multiple such fields in a container then the demuxer should choose the one
1264 * which maximizes the information about the used codec.
1265 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1266 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1267 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1269 * - encoding: Set by user, if not then the default based on codec_id will be used.
1270 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1272 unsigned int codec_tag;
1274 #if FF_API_STREAM_CODEC_TAG
1276 * @deprecated this field is unused
1278 attribute_deprecated
1279 unsigned int stream_codec_tag;
1285 * Private context used for internal data.
1287 * Unlike priv_data, this is not codec-specific. It is used in general
1288 * libavcodec functions.
1290 struct AVCodecInternal *internal;
1293 * Private data of the user, can be used to carry app specific stuff.
1294 * - encoding: Set by user.
1295 * - decoding: Set by user.
1300 * the average bitrate
1301 * - encoding: Set by user; unused for constant quantizer encoding.
1302 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1307 * number of bits the bitstream is allowed to diverge from the reference.
1308 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1309 * - encoding: Set by user; unused for constant quantizer encoding.
1310 * - decoding: unused
1312 int bit_rate_tolerance;
1315 * Global quality for codecs which cannot change it per frame.
1316 * This should be proportional to MPEG-1/2/4 qscale.
1317 * - encoding: Set by user.
1318 * - decoding: unused
1323 * - encoding: Set by user.
1324 * - decoding: unused
1326 int compression_level;
1327 #define FF_COMPRESSION_DEFAULT -1
1331 * - encoding: Set by user.
1332 * - decoding: Set by user.
1338 * - encoding: Set by user.
1339 * - decoding: Set by user.
1344 * some codecs need / can use extradata like Huffman tables.
1345 * mjpeg: Huffman tables
1346 * rv10: additional flags
1347 * mpeg4: global headers (they can be in the bitstream or here)
1348 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1349 * than extradata_size to avoid problems if it is read with the bitstream reader.
1350 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1351 * - encoding: Set/allocated/freed by libavcodec.
1352 * - decoding: Set/allocated/freed by user.
1358 * This is the fundamental unit of time (in seconds) in terms
1359 * of which frame timestamps are represented. For fixed-fps content,
1360 * timebase should be 1/framerate and timestamp increments should be
1362 * This often, but not always is the inverse of the frame rate or field rate
1364 * - encoding: MUST be set by user.
1365 * - decoding: the use of this field for decoding is deprecated.
1366 * Use framerate instead.
1368 AVRational time_base;
1371 * For some codecs, the time base is closer to the field rate than the frame rate.
1372 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1373 * if no telecine is used ...
1375 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1377 int ticks_per_frame;
1382 * Encoding: Number of frames delay there will be from the encoder input to
1383 * the decoder output. (we assume the decoder matches the spec)
1384 * Decoding: Number of frames delay in addition to what a standard decoder
1385 * as specified in the spec would produce.
1388 * Number of frames the decoded output will be delayed relative to the
1392 * For encoding, this field is unused (see initial_padding).
1394 * For decoding, this is the number of samples the decoder needs to
1395 * output before the decoder's output is valid. When seeking, you should
1396 * start decoding this many samples prior to your desired seek point.
1398 * - encoding: Set by libavcodec.
1399 * - decoding: Set by libavcodec.
1406 * picture width / height.
1407 * - encoding: MUST be set by user.
1408 * - decoding: May be set by the user before opening the decoder if known e.g.
1409 * from the container. Some decoders will require the dimensions
1410 * to be set by the caller. During decoding, the decoder may
1411 * overwrite those values as required.
1416 * Bitstream width / height, may be different from width/height e.g. when
1417 * the decoded frame is cropped before being output or lowres is enabled.
1418 * - encoding: unused
1419 * - decoding: May be set by the user before opening the decoder if known
1420 * e.g. from the container. During decoding, the decoder may
1421 * overwrite those values as required.
1423 int coded_width, coded_height;
1425 #if FF_API_ASPECT_EXTENDED
1426 #define FF_ASPECT_EXTENDED 15
1430 * the number of pictures in a group of pictures, or 0 for intra_only
1431 * - encoding: Set by user.
1432 * - decoding: unused
1437 * Pixel format, see AV_PIX_FMT_xxx.
1438 * May be set by the demuxer if known from headers.
1439 * May be overridden by the decoder if it knows better.
1440 * - encoding: Set by user.
1441 * - decoding: Set by user if known, overridden by libavcodec if known
1443 enum AVPixelFormat pix_fmt;
1446 * Motion estimation algorithm used for video coding.
1447 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1448 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1449 * - encoding: MUST be set by user.
1450 * - decoding: unused
1455 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1456 * decoder to draw a horizontal band. It improves cache usage. Not
1457 * all codecs can do that. You must check the codec capabilities
1459 * When multithreading is used, it may be called from multiple threads
1460 * at the same time; threads might draw different parts of the same AVFrame,
1461 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1463 * The function is also used by hardware acceleration APIs.
1464 * It is called at least once during frame decoding to pass
1465 * the data needed for hardware render.
1466 * In that mode instead of pixel data, AVFrame points to
1467 * a structure specific to the acceleration API. The application
1468 * reads the structure and can change some fields to indicate progress
1470 * - encoding: unused
1471 * - decoding: Set by user.
1472 * @param height the height of the slice
1473 * @param y the y position of the slice
1474 * @param type 1->top field, 2->bottom field, 3->frame
1475 * @param offset offset into the AVFrame.data from which the slice should be read
1477 void (*draw_horiz_band)(struct AVCodecContext *s,
1478 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1479 int y, int type, int height);
1482 * callback to negotiate the pixelFormat
1483 * @param fmt is the list of formats which are supported by the codec,
1484 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1485 * The first is always the native one.
1486 * @note The callback may be called again immediately if initialization for
1487 * the selected (hardware-accelerated) pixel format failed.
1488 * @warning Behavior is undefined if the callback returns a value not
1489 * in the fmt list of formats.
1490 * @return the chosen format
1491 * - encoding: unused
1492 * - decoding: Set by user, if not set the native format will be chosen.
1494 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1497 * maximum number of B-frames between non-B-frames
1498 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1499 * - encoding: Set by user.
1500 * - decoding: unused
1505 * qscale factor between IP and B-frames
1506 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1507 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1508 * - encoding: Set by user.
1509 * - decoding: unused
1511 float b_quant_factor;
1513 /** obsolete FIXME remove */
1515 #define FF_RC_STRATEGY_XVID 1
1517 int b_frame_strategy;
1520 * qscale offset between IP and B-frames
1521 * - encoding: Set by user.
1522 * - decoding: unused
1524 float b_quant_offset;
1527 * Size of the frame reordering buffer in the decoder.
1528 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1529 * - encoding: Set by libavcodec.
1530 * - decoding: Set by libavcodec.
1535 * 0-> h263 quant 1-> mpeg quant
1536 * - encoding: Set by user.
1537 * - decoding: unused
1542 * qscale factor between P and I-frames
1543 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1544 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1545 * - encoding: Set by user.
1546 * - decoding: unused
1548 float i_quant_factor;
1551 * qscale offset between P and I-frames
1552 * - encoding: Set by user.
1553 * - decoding: unused
1555 float i_quant_offset;
1558 * luminance masking (0-> disabled)
1559 * - encoding: Set by user.
1560 * - decoding: unused
1565 * temporary complexity masking (0-> disabled)
1566 * - encoding: Set by user.
1567 * - decoding: unused
1569 float temporal_cplx_masking;
1572 * spatial complexity masking (0-> disabled)
1573 * - encoding: Set by user.
1574 * - decoding: unused
1576 float spatial_cplx_masking;
1579 * p block masking (0-> disabled)
1580 * - encoding: Set by user.
1581 * - decoding: unused
1586 * darkness masking (0-> disabled)
1587 * - encoding: Set by user.
1588 * - decoding: unused
1594 * - encoding: Set by libavcodec.
1595 * - decoding: Set by user (or 0).
1599 * prediction method (needed for huffyuv)
1600 * - encoding: Set by user.
1601 * - decoding: unused
1603 int prediction_method;
1604 #define FF_PRED_LEFT 0
1605 #define FF_PRED_PLANE 1
1606 #define FF_PRED_MEDIAN 2
1609 * slice offsets in the frame in bytes
1610 * - encoding: Set/allocated by libavcodec.
1611 * - decoding: Set/allocated by user (or NULL).
1616 * sample aspect ratio (0 if unknown)
1617 * That is the width of a pixel divided by the height of the pixel.
1618 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1619 * - encoding: Set by user.
1620 * - decoding: Set by libavcodec.
1622 AVRational sample_aspect_ratio;
1625 * motion estimation comparison function
1626 * - encoding: Set by user.
1627 * - decoding: unused
1631 * subpixel motion estimation comparison function
1632 * - encoding: Set by user.
1633 * - decoding: unused
1637 * macroblock comparison function (not supported yet)
1638 * - encoding: Set by user.
1639 * - decoding: unused
1643 * interlaced DCT comparison function
1644 * - encoding: Set by user.
1645 * - decoding: unused
1648 #define FF_CMP_SAD 0
1649 #define FF_CMP_SSE 1
1650 #define FF_CMP_SATD 2
1651 #define FF_CMP_DCT 3
1652 #define FF_CMP_PSNR 4
1653 #define FF_CMP_BIT 5
1655 #define FF_CMP_ZERO 7
1656 #define FF_CMP_VSAD 8
1657 #define FF_CMP_VSSE 9
1658 #define FF_CMP_NSSE 10
1659 #define FF_CMP_W53 11
1660 #define FF_CMP_W97 12
1661 #define FF_CMP_DCTMAX 13
1662 #define FF_CMP_DCT264 14
1663 #define FF_CMP_CHROMA 256
1666 * ME diamond size & shape
1667 * - encoding: Set by user.
1668 * - decoding: unused
1673 * amount of previous MV predictors (2a+1 x 2a+1 square)
1674 * - encoding: Set by user.
1675 * - decoding: unused
1677 int last_predictor_count;
1680 * prepass for motion estimation
1681 * - encoding: Set by user.
1682 * - decoding: unused
1687 * motion estimation prepass comparison function
1688 * - encoding: Set by user.
1689 * - decoding: unused
1694 * ME prepass diamond size & shape
1695 * - encoding: Set by user.
1696 * - decoding: unused
1702 * - encoding: Set by user.
1703 * - decoding: unused
1705 int me_subpel_quality;
1709 * DTG active format information (additional aspect ratio
1710 * information only used in DVB MPEG-2 transport streams)
1713 * - encoding: unused
1714 * - decoding: Set by decoder.
1715 * @deprecated Deprecated in favor of AVSideData
1717 attribute_deprecated int dtg_active_format;
1718 #define FF_DTG_AFD_SAME 8
1719 #define FF_DTG_AFD_4_3 9
1720 #define FF_DTG_AFD_16_9 10
1721 #define FF_DTG_AFD_14_9 11
1722 #define FF_DTG_AFD_4_3_SP_14_9 13
1723 #define FF_DTG_AFD_16_9_SP_14_9 14
1724 #define FF_DTG_AFD_SP_4_3 15
1725 #endif /* FF_API_AFD */
1728 * maximum motion estimation search range in subpel units
1729 * If 0 then no limit.
1731 * - encoding: Set by user.
1732 * - decoding: unused
1737 * intra quantizer bias
1738 * - encoding: Set by user.
1739 * - decoding: unused
1741 int intra_quant_bias;
1742 #define FF_DEFAULT_QUANT_BIAS 999999
1745 * inter quantizer bias
1746 * - encoding: Set by user.
1747 * - decoding: unused
1749 int inter_quant_bias;
1753 * - encoding: unused
1754 * - decoding: Set by user.
1757 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1758 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1759 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1763 * XVideo Motion Acceleration
1764 * - encoding: forbidden
1765 * - decoding: set by decoder
1766 * @deprecated XvMC doesn't need it anymore.
1768 attribute_deprecated int xvmc_acceleration;
1769 #endif /* FF_API_XVMC */
1772 * macroblock decision mode
1773 * - encoding: Set by user.
1774 * - decoding: unused
1777 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1778 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1779 #define FF_MB_DECISION_RD 2 ///< rate distortion
1782 * custom intra quantization matrix
1783 * - encoding: Set by user, can be NULL.
1784 * - decoding: Set by libavcodec.
1786 uint16_t *intra_matrix;
1789 * custom inter quantization matrix
1790 * - encoding: Set by user, can be NULL.
1791 * - decoding: Set by libavcodec.
1793 uint16_t *inter_matrix;
1796 * scene change detection threshold
1797 * 0 is default, larger means fewer detected scene changes.
1798 * - encoding: Set by user.
1799 * - decoding: unused
1801 int scenechange_threshold;
1804 * noise reduction strength
1805 * - encoding: Set by user.
1806 * - decoding: unused
1808 int noise_reduction;
1812 * @deprecated this field is unused
1814 attribute_deprecated
1818 * @deprecated this field is unused
1820 attribute_deprecated
1825 * precision of the intra DC coefficient - 8
1826 * - encoding: Set by user.
1827 * - decoding: Set by libavcodec
1829 int intra_dc_precision;
1832 * Number of macroblock rows at the top which are skipped.
1833 * - encoding: unused
1834 * - decoding: Set by user.
1839 * Number of macroblock rows at the bottom which are skipped.
1840 * - encoding: unused
1841 * - decoding: Set by user.
1847 * @deprecated use encoder private options instead
1849 attribute_deprecated
1850 float border_masking;
1854 * minimum MB lagrange multipler
1855 * - encoding: Set by user.
1856 * - decoding: unused
1861 * maximum MB lagrange multipler
1862 * - encoding: Set by user.
1863 * - decoding: unused
1869 * - encoding: Set by user.
1870 * - decoding: unused
1872 int me_penalty_compensation;
1876 * - encoding: Set by user.
1877 * - decoding: unused
1883 * - encoding: Set by user.
1884 * - decoding: unused
1890 * - encoding: Set by user.
1891 * - decoding: unused
1896 * number of reference frames
1897 * - encoding: Set by user.
1898 * - decoding: Set by lavc.
1903 * chroma qp offset from luma
1904 * - encoding: Set by user.
1905 * - decoding: unused
1909 #if FF_API_UNUSED_MEMBERS
1911 * Multiplied by qscale for each frame and added to scene_change_score.
1912 * - encoding: Set by user.
1913 * - decoding: unused
1915 attribute_deprecated int scenechange_factor;
1920 * Note: Value depends upon the compare function used for fullpel ME.
1921 * - encoding: Set by user.
1922 * - decoding: unused
1927 * Adjust sensitivity of b_frame_strategy 1.
1928 * - encoding: Set by user.
1929 * - decoding: unused
1934 * Chromaticity coordinates of the source primaries.
1935 * - encoding: Set by user
1936 * - decoding: Set by libavcodec
1938 enum AVColorPrimaries color_primaries;
1941 * Color Transfer Characteristic.
1942 * - encoding: Set by user
1943 * - decoding: Set by libavcodec
1945 enum AVColorTransferCharacteristic color_trc;
1948 * YUV colorspace type.
1949 * - encoding: Set by user
1950 * - decoding: Set by libavcodec
1952 enum AVColorSpace colorspace;
1955 * MPEG vs JPEG YUV range.
1956 * - encoding: Set by user
1957 * - decoding: Set by libavcodec
1959 enum AVColorRange color_range;
1962 * This defines the location of chroma samples.
1963 * - encoding: Set by user
1964 * - decoding: Set by libavcodec
1966 enum AVChromaLocation chroma_sample_location;
1970 * Indicates number of picture subdivisions. Used for parallelized
1972 * - encoding: Set by user
1973 * - decoding: unused
1978 * - encoding: set by libavcodec
1979 * - decoding: Set by user.
1981 enum AVFieldOrder field_order;
1984 int sample_rate; ///< samples per second
1985 int channels; ///< number of audio channels
1988 * audio sample format
1989 * - encoding: Set by user.
1990 * - decoding: Set by libavcodec.
1992 enum AVSampleFormat sample_fmt; ///< sample format
1994 /* The following data should not be initialized. */
1996 * Number of samples per channel in an audio frame.
1998 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1999 * except the last must contain exactly frame_size samples per channel.
2000 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2001 * frame size is not restricted.
2002 * - decoding: may be set by some decoders to indicate constant frame size
2007 * Frame counter, set by libavcodec.
2009 * - decoding: total number of frames returned from the decoder so far.
2010 * - encoding: total number of frames passed to the encoder so far.
2012 * @note the counter is not incremented if encoding/decoding resulted in
2018 * number of bytes per packet if constant and known or 0
2019 * Used by some WAV based audio codecs.
2024 * Audio cutoff bandwidth (0 means "automatic")
2025 * - encoding: Set by user.
2026 * - decoding: unused
2030 #if FF_API_REQUEST_CHANNELS
2032 * Decoder should decode to this many channels if it can (0 for default)
2033 * - encoding: unused
2034 * - decoding: Set by user.
2035 * @deprecated Deprecated in favor of request_channel_layout.
2037 attribute_deprecated int request_channels;
2041 * Audio channel layout.
2042 * - encoding: set by user.
2043 * - decoding: set by user, may be overwritten by libavcodec.
2045 uint64_t channel_layout;
2048 * Request decoder to use this channel layout if it can (0 for default)
2049 * - encoding: unused
2050 * - decoding: Set by user.
2052 uint64_t request_channel_layout;
2055 * Type of service that the audio stream conveys.
2056 * - encoding: Set by user.
2057 * - decoding: Set by libavcodec.
2059 enum AVAudioServiceType audio_service_type;
2062 * desired sample format
2063 * - encoding: Not used.
2064 * - decoding: Set by user.
2065 * Decoder will decode to this format if it can.
2067 enum AVSampleFormat request_sample_fmt;
2069 #if FF_API_GET_BUFFER
2071 * Called at the beginning of each frame to get a buffer for it.
2073 * The function will set AVFrame.data[], AVFrame.linesize[].
2074 * AVFrame.extended_data[] must also be set, but it should be the same as
2075 * AVFrame.data[] except for planar audio with more channels than can fit
2076 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2077 * many data pointers as it can hold.
2079 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2080 * avcodec_default_get_buffer() instead of providing buffers allocated by
2083 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2084 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2085 * but if get_buffer() is overridden then alignment considerations should
2086 * be taken into account.
2088 * @see avcodec_default_get_buffer()
2092 * If pic.reference is set then the frame will be read later by libavcodec.
2093 * avcodec_align_dimensions2() should be used to find the required width and
2094 * height, as they normally need to be rounded up to the next multiple of 16.
2096 * If frame multithreading is used and thread_safe_callbacks is set,
2097 * it may be called from a different thread, but not from more than one at
2098 * once. Does not need to be reentrant.
2100 * @see release_buffer(), reget_buffer()
2101 * @see avcodec_align_dimensions2()
2105 * Decoders request a buffer of a particular size by setting
2106 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2107 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2108 * to a smaller value in the output frame.
2110 * Decoders cannot use the buffer after returning from
2111 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2112 * is assumed to be released immediately upon return. In some rare cases,
2113 * a decoder may need to call get_buffer() more than once in a single
2114 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
2115 * called again after it has already been called once, the previously
2116 * acquired buffer is assumed to be released at that time and may not be
2117 * reused by the decoder.
2119 * As a convenience, av_samples_get_buffer_size() and
2120 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2121 * functions to find the required data size and to fill data pointers and
2122 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2123 * since all planes must be the same size.
2125 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2127 * - encoding: unused
2128 * - decoding: Set by libavcodec, user can override.
2130 * @deprecated use get_buffer2()
2132 attribute_deprecated
2133 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2136 * Called to release buffers which were allocated with get_buffer.
2137 * A released buffer can be reused in get_buffer().
2138 * pic.data[*] must be set to NULL.
2139 * May be called from a different thread if frame multithreading is used,
2140 * but not by more than one thread at once, so does not need to be reentrant.
2141 * - encoding: unused
2142 * - decoding: Set by libavcodec, user can override.
2144 * @deprecated custom freeing callbacks should be set from get_buffer2()
2146 attribute_deprecated
2147 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2150 * Called at the beginning of a frame to get cr buffer for it.
2151 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2152 * libavcodec will pass previous buffer in pic, function should return
2153 * same buffer or new buffer with old frame "painted" into it.
2154 * If pic.data[0] == NULL must behave like get_buffer().
2155 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2156 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2158 * - encoding: unused
2159 * - decoding: Set by libavcodec, user can override.
2161 attribute_deprecated
2162 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2166 * This callback is called at the beginning of each frame to get data
2167 * buffer(s) for it. There may be one contiguous buffer for all the data or
2168 * there may be a buffer per each data plane or anything in between. What
2169 * this means is, you may set however many entries in buf[] you feel necessary.
2170 * Each buffer must be reference-counted using the AVBuffer API (see description
2173 * The following fields will be set in the frame before this callback is
2176 * - width, height (video only)
2177 * - sample_rate, channel_layout, nb_samples (audio only)
2178 * Their values may differ from the corresponding values in
2179 * AVCodecContext. This callback must use the frame values, not the codec
2180 * context values, to calculate the required buffer size.
2182 * This callback must fill the following fields in the frame:
2186 * * if the data is planar audio with more than 8 channels, then this
2187 * callback must allocate and fill extended_data to contain all pointers
2188 * to all data planes. data[] must hold as many pointers as it can.
2189 * extended_data must be allocated with av_malloc() and will be freed in
2191 * * otherwise exended_data must point to data
2192 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2193 * the frame's data and extended_data pointers must be contained in these. That
2194 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2195 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2196 * and av_buffer_ref().
2197 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2198 * this callback and filled with the extra buffers if there are more
2199 * buffers than buf[] can hold. extended_buf will be freed in
2202 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2203 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2206 * Each data plane must be aligned to the maximum required by the target
2209 * @see avcodec_default_get_buffer2()
2213 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2214 * (read and/or written to if it is writable) later by libavcodec.
2216 * avcodec_align_dimensions2() should be used to find the required width and
2217 * height, as they normally need to be rounded up to the next multiple of 16.
2219 * Some decoders do not support linesizes changing between frames.
2221 * If frame multithreading is used and thread_safe_callbacks is set,
2222 * this callback may be called from a different thread, but not from more
2223 * than one at once. Does not need to be reentrant.
2225 * @see avcodec_align_dimensions2()
2229 * Decoders request a buffer of a particular size by setting
2230 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2231 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2232 * to a smaller value in the output frame.
2234 * As a convenience, av_samples_get_buffer_size() and
2235 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2236 * functions to find the required data size and to fill data pointers and
2237 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2238 * since all planes must be the same size.
2240 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2242 * - encoding: unused
2243 * - decoding: Set by libavcodec, user can override.
2245 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2248 * If non-zero, the decoded audio and video frames returned from
2249 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2250 * and are valid indefinitely. The caller must free them with
2251 * av_frame_unref() when they are not needed anymore.
2252 * Otherwise, the decoded frames must not be freed by the caller and are
2253 * only valid until the next decode call.
2255 * - encoding: unused
2256 * - decoding: set by the caller before avcodec_open2().
2258 int refcounted_frames;
2260 /* - encoding parameters */
2261 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2262 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2266 * - encoding: Set by user.
2267 * - decoding: unused
2273 * - encoding: Set by user.
2274 * - decoding: unused
2279 * maximum quantizer difference between frames
2280 * - encoding: Set by user.
2281 * - decoding: unused
2287 * @deprecated use encoder private options instead
2289 attribute_deprecated
2292 attribute_deprecated
2294 attribute_deprecated
2299 * decoder bitstream buffer size
2300 * - encoding: Set by user.
2301 * - decoding: unused
2306 * ratecontrol override, see RcOverride
2307 * - encoding: Allocated/set/freed by user.
2308 * - decoding: unused
2310 int rc_override_count;
2311 RcOverride *rc_override;
2315 * @deprecated use encoder private options instead
2317 attribute_deprecated
2323 * - encoding: Set by user.
2324 * - decoding: Set by libavcodec.
2330 * - encoding: Set by user.
2331 * - decoding: unused
2337 * @deprecated use encoder private options instead
2339 attribute_deprecated
2340 float rc_buffer_aggressivity;
2342 attribute_deprecated
2343 float rc_initial_cplx;
2347 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2348 * - encoding: Set by user.
2349 * - decoding: unused.
2351 float rc_max_available_vbv_use;
2354 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2355 * - encoding: Set by user.
2356 * - decoding: unused.
2358 float rc_min_vbv_overflow_use;
2361 * Number of bits which should be loaded into the rc buffer before decoding starts.
2362 * - encoding: Set by user.
2363 * - decoding: unused
2365 int rc_initial_buffer_occupancy;
2367 #define FF_CODER_TYPE_VLC 0
2368 #define FF_CODER_TYPE_AC 1
2369 #define FF_CODER_TYPE_RAW 2
2370 #define FF_CODER_TYPE_RLE 3
2371 #if FF_API_UNUSED_MEMBERS
2372 #define FF_CODER_TYPE_DEFLATE 4
2373 #endif /* FF_API_UNUSED_MEMBERS */
2376 * - encoding: Set by user.
2377 * - decoding: unused
2383 * - encoding: Set by user.
2384 * - decoding: unused
2390 * @deprecated use encoder private options instead
2392 attribute_deprecated
2396 * @deprecated use encoder private options instead
2398 attribute_deprecated
2403 * frame skip threshold
2404 * - encoding: Set by user.
2405 * - decoding: unused
2407 int frame_skip_threshold;
2411 * - encoding: Set by user.
2412 * - decoding: unused
2414 int frame_skip_factor;
2417 * frame skip exponent
2418 * - encoding: Set by user.
2419 * - decoding: unused
2424 * frame skip comparison function
2425 * - encoding: Set by user.
2426 * - decoding: unused
2431 * trellis RD quantization
2432 * - encoding: Set by user.
2433 * - decoding: unused
2438 * - encoding: Set by user.
2439 * - decoding: unused
2441 int min_prediction_order;
2444 * - encoding: Set by user.
2445 * - decoding: unused
2447 int max_prediction_order;
2450 * GOP timecode frame start number
2451 * - encoding: Set by user, in non drop frame format
2452 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2454 int64_t timecode_frame_start;
2456 /* The RTP callback: This function is called */
2457 /* every time the encoder has a packet to send. */
2458 /* It depends on the encoder if the data starts */
2459 /* with a Start Code (it should). H.263 does. */
2460 /* mb_nb contains the number of macroblocks */
2461 /* encoded in the RTP payload. */
2462 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2464 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2465 /* do its best to deliver a chunk with size */
2466 /* below rtp_payload_size, the chunk will start */
2467 /* with a start code on some codecs like H.263. */
2468 /* This doesn't take account of any particular */
2469 /* headers inside the transmitted RTP payload. */
2471 /* statistics, used for 2-pass encoding */
2482 * number of bits used for the previously encoded frame
2483 * - encoding: Set by libavcodec.
2484 * - decoding: unused
2489 * pass1 encoding statistics output buffer
2490 * - encoding: Set by libavcodec.
2491 * - decoding: unused
2496 * pass2 encoding statistics input buffer
2497 * Concatenated stuff from stats_out of pass1 should be placed here.
2498 * - encoding: Allocated/set/freed by user.
2499 * - decoding: unused
2504 * Work around bugs in encoders which sometimes cannot be detected automatically.
2505 * - encoding: Set by user
2506 * - decoding: Set by user
2508 int workaround_bugs;
2509 #define FF_BUG_AUTODETECT 1 ///< autodetection
2510 #if FF_API_OLD_MSMPEG4
2511 #define FF_BUG_OLD_MSMPEG4 2
2513 #define FF_BUG_XVID_ILACE 4
2514 #define FF_BUG_UMP4 8
2515 #define FF_BUG_NO_PADDING 16
2516 #define FF_BUG_AMV 32
2518 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2520 #define FF_BUG_QPEL_CHROMA 64
2521 #define FF_BUG_STD_QPEL 128
2522 #define FF_BUG_QPEL_CHROMA2 256
2523 #define FF_BUG_DIRECT_BLOCKSIZE 512
2524 #define FF_BUG_EDGE 1024
2525 #define FF_BUG_HPEL_CHROMA 2048
2526 #define FF_BUG_DC_CLIP 4096
2527 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2528 #define FF_BUG_TRUNCATED 16384
2531 * strictly follow the standard (MPEG4, ...).
2532 * - encoding: Set by user.
2533 * - decoding: Set by user.
2534 * Setting this to STRICT or higher means the encoder and decoder will
2535 * generally do stupid things, whereas setting it to unofficial or lower
2536 * will mean the encoder might produce output that is not supported by all
2537 * spec-compliant decoders. Decoders don't differentiate between normal,
2538 * unofficial and experimental (that is, they always try to decode things
2539 * when they can) unless they are explicitly asked to behave stupidly
2540 * (=strictly conform to the specs)
2542 int strict_std_compliance;
2543 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2544 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2545 #define FF_COMPLIANCE_NORMAL 0
2546 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2547 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2550 * error concealment flags
2551 * - encoding: unused
2552 * - decoding: Set by user.
2554 int error_concealment;
2555 #define FF_EC_GUESS_MVS 1
2556 #define FF_EC_DEBLOCK 2
2557 #define FF_EC_FAVOR_INTER 256
2561 * - encoding: Set by user.
2562 * - decoding: Set by user.
2565 #define FF_DEBUG_PICT_INFO 1
2566 #define FF_DEBUG_RC 2
2567 #define FF_DEBUG_BITSTREAM 4
2568 #define FF_DEBUG_MB_TYPE 8
2569 #define FF_DEBUG_QP 16
2572 * @deprecated this option does nothing
2574 #define FF_DEBUG_MV 32
2576 #define FF_DEBUG_DCT_COEFF 0x00000040
2577 #define FF_DEBUG_SKIP 0x00000080
2578 #define FF_DEBUG_STARTCODE 0x00000100
2579 #if FF_API_UNUSED_MEMBERS
2580 #define FF_DEBUG_PTS 0x00000200
2581 #endif /* FF_API_UNUSED_MEMBERS */
2582 #define FF_DEBUG_ER 0x00000400
2583 #define FF_DEBUG_MMCO 0x00000800
2584 #define FF_DEBUG_BUGS 0x00001000
2586 #define FF_DEBUG_VIS_QP 0x00002000 ///< only access through AVOptions from outside libavcodec
2587 #define FF_DEBUG_VIS_MB_TYPE 0x00004000 ///< only access through AVOptions from outside libavcodec
2589 #define FF_DEBUG_BUFFERS 0x00008000
2590 #define FF_DEBUG_THREADS 0x00010000
2591 #define FF_DEBUG_NOMC 0x01000000
2596 * Code outside libavcodec should access this field using AVOptions
2597 * - encoding: Set by user.
2598 * - decoding: Set by user.
2601 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2602 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2603 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2607 * Error recognition; may misdetect some more or less valid parts as errors.
2608 * - encoding: unused
2609 * - decoding: Set by user.
2611 int err_recognition;
2614 * Verify checksums embedded in the bitstream (could be of either encoded or
2615 * decoded data, depending on the codec) and print an error message on mismatch.
2616 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2617 * decoder returning an error.
2619 #define AV_EF_CRCCHECK (1<<0)
2620 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2621 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2622 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2624 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2625 #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
2626 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2627 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2631 * opaque 64bit number (generally a PTS) that will be reordered and
2632 * output in AVFrame.reordered_opaque
2633 * - encoding: unused
2634 * - decoding: Set by user.
2636 int64_t reordered_opaque;
2639 * Hardware accelerator in use
2640 * - encoding: unused.
2641 * - decoding: Set by libavcodec
2643 struct AVHWAccel *hwaccel;
2646 * Hardware accelerator context.
2647 * For some hardware accelerators, a global context needs to be
2648 * provided by the user. In that case, this holds display-dependent
2649 * data FFmpeg cannot instantiate itself. Please refer to the
2650 * FFmpeg HW accelerator documentation to know how to fill this
2651 * is. e.g. for VA API, this is a struct vaapi_context.
2652 * - encoding: unused
2653 * - decoding: Set by user
2655 void *hwaccel_context;
2659 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2660 * - decoding: unused
2662 uint64_t error[AV_NUM_DATA_POINTERS];
2665 * DCT algorithm, see FF_DCT_* below
2666 * - encoding: Set by user.
2667 * - decoding: unused
2670 #define FF_DCT_AUTO 0
2671 #define FF_DCT_FASTINT 1
2672 #if FF_API_UNUSED_MEMBERS
2673 #define FF_DCT_INT 2
2674 #endif /* FF_API_UNUSED_MEMBERS */
2675 #define FF_DCT_MMX 3
2676 #define FF_DCT_ALTIVEC 5
2677 #define FF_DCT_FAAN 6
2680 * IDCT algorithm, see FF_IDCT_* below.
2681 * - encoding: Set by user.
2682 * - decoding: Set by user.
2685 #define FF_IDCT_AUTO 0
2686 #define FF_IDCT_INT 1
2687 #define FF_IDCT_SIMPLE 2
2688 #define FF_IDCT_SIMPLEMMX 3
2689 #define FF_IDCT_ARM 7
2690 #define FF_IDCT_ALTIVEC 8
2692 #define FF_IDCT_SH4 9
2694 #define FF_IDCT_SIMPLEARM 10
2695 #if FF_API_UNUSED_MEMBERS
2696 #define FF_IDCT_IPP 13
2697 #endif /* FF_API_UNUSED_MEMBERS */
2698 #define FF_IDCT_XVID 14
2699 #if FF_API_IDCT_XVIDMMX
2700 #define FF_IDCT_XVIDMMX 14
2701 #endif /* FF_API_IDCT_XVIDMMX */
2702 #define FF_IDCT_SIMPLEARMV5TE 16
2703 #define FF_IDCT_SIMPLEARMV6 17
2704 #if FF_API_ARCH_SPARC
2705 #define FF_IDCT_SIMPLEVIS 18
2707 #define FF_IDCT_FAAN 20
2708 #define FF_IDCT_SIMPLENEON 22
2709 #if FF_API_ARCH_ALPHA
2710 #define FF_IDCT_SIMPLEALPHA 23
2712 #define FF_IDCT_SIMPLEAUTO 128
2715 * bits per sample/pixel from the demuxer (needed for huffyuv).
2716 * - encoding: Set by libavcodec.
2717 * - decoding: Set by user.
2719 int bits_per_coded_sample;
2722 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2723 * - encoding: set by user.
2724 * - decoding: set by libavcodec.
2726 int bits_per_raw_sample;
2730 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2731 * - encoding: unused
2732 * - decoding: Set by user.
2733 * Code outside libavcodec should access this field using:
2734 * av_codec_{get,set}_lowres(avctx)
2740 * the picture in the bitstream
2741 * - encoding: Set by libavcodec.
2742 * - decoding: unused
2744 AVFrame *coded_frame;
2748 * is used to decide how many independent tasks should be passed to execute()
2749 * - encoding: Set by user.
2750 * - decoding: Set by user.
2755 * Which multithreading methods to use.
2756 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2757 * so clients which cannot provide future frames should not use it.
2759 * - encoding: Set by user, otherwise the default is used.
2760 * - decoding: Set by user, otherwise the default is used.
2763 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2764 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2767 * Which multithreading methods are in use by the codec.
2768 * - encoding: Set by libavcodec.
2769 * - decoding: Set by libavcodec.
2771 int active_thread_type;
2774 * Set by the client if its custom get_buffer() callback can be called
2775 * synchronously from another thread, which allows faster multithreaded decoding.
2776 * draw_horiz_band() will be called from other threads regardless of this setting.
2777 * Ignored if the default get_buffer() is used.
2778 * - encoding: Set by user.
2779 * - decoding: Set by user.
2781 int thread_safe_callbacks;
2784 * The codec may call this to execute several independent things.
2785 * It will return only after finishing all tasks.
2786 * The user may replace this with some multithreaded implementation,
2787 * the default implementation will execute the parts serially.
2788 * @param count the number of things to execute
2789 * - encoding: Set by libavcodec, user can override.
2790 * - decoding: Set by libavcodec, user can override.
2792 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2795 * The codec may call this to execute several independent things.
2796 * It will return only after finishing all tasks.
2797 * The user may replace this with some multithreaded implementation,
2798 * the default implementation will execute the parts serially.
2799 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2800 * @param c context passed also to func
2801 * @param count the number of things to execute
2802 * @param arg2 argument passed unchanged to func
2803 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2804 * @param func function that will be called count times, with jobnr from 0 to count-1.
2805 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2806 * two instances of func executing at the same time will have the same threadnr.
2807 * @return always 0 currently, but code should handle a future improvement where when any call to func
2808 * returns < 0 no further calls to func may be done and < 0 is returned.
2809 * - encoding: Set by libavcodec, user can override.
2810 * - decoding: Set by libavcodec, user can override.
2812 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2814 #if FF_API_THREAD_OPAQUE
2816 * @deprecated this field should not be used from outside of lavc
2818 attribute_deprecated
2819 void *thread_opaque;
2823 * noise vs. sse weight for the nsse comparison function
2824 * - encoding: Set by user.
2825 * - decoding: unused
2831 * - encoding: Set by user.
2832 * - decoding: Set by libavcodec.
2835 #define FF_PROFILE_UNKNOWN -99
2836 #define FF_PROFILE_RESERVED -100
2838 #define FF_PROFILE_AAC_MAIN 0
2839 #define FF_PROFILE_AAC_LOW 1
2840 #define FF_PROFILE_AAC_SSR 2
2841 #define FF_PROFILE_AAC_LTP 3
2842 #define FF_PROFILE_AAC_HE 4
2843 #define FF_PROFILE_AAC_HE_V2 28
2844 #define FF_PROFILE_AAC_LD 22
2845 #define FF_PROFILE_AAC_ELD 38
2846 #define FF_PROFILE_MPEG2_AAC_LOW 128
2847 #define FF_PROFILE_MPEG2_AAC_HE 131
2849 #define FF_PROFILE_DTS 20
2850 #define FF_PROFILE_DTS_ES 30
2851 #define FF_PROFILE_DTS_96_24 40
2852 #define FF_PROFILE_DTS_HD_HRA 50
2853 #define FF_PROFILE_DTS_HD_MA 60
2854 #define FF_PROFILE_DTS_EXPRESS 70
2856 #define FF_PROFILE_MPEG2_422 0
2857 #define FF_PROFILE_MPEG2_HIGH 1
2858 #define FF_PROFILE_MPEG2_SS 2
2859 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2860 #define FF_PROFILE_MPEG2_MAIN 4
2861 #define FF_PROFILE_MPEG2_SIMPLE 5
2863 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2864 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2866 #define FF_PROFILE_H264_BASELINE 66
2867 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2868 #define FF_PROFILE_H264_MAIN 77
2869 #define FF_PROFILE_H264_EXTENDED 88
2870 #define FF_PROFILE_H264_HIGH 100
2871 #define FF_PROFILE_H264_HIGH_10 110
2872 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2873 #define FF_PROFILE_H264_HIGH_422 122
2874 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2875 #define FF_PROFILE_H264_HIGH_444 144
2876 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2877 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2878 #define FF_PROFILE_H264_CAVLC_444 44
2880 #define FF_PROFILE_VC1_SIMPLE 0
2881 #define FF_PROFILE_VC1_MAIN 1
2882 #define FF_PROFILE_VC1_COMPLEX 2
2883 #define FF_PROFILE_VC1_ADVANCED 3
2885 #define FF_PROFILE_MPEG4_SIMPLE 0
2886 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2887 #define FF_PROFILE_MPEG4_CORE 2
2888 #define FF_PROFILE_MPEG4_MAIN 3
2889 #define FF_PROFILE_MPEG4_N_BIT 4
2890 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2891 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2892 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2893 #define FF_PROFILE_MPEG4_HYBRID 8
2894 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2895 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2896 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2897 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2898 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2899 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2900 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2902 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2903 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2904 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2905 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2906 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2909 #define FF_PROFILE_HEVC_MAIN 1
2910 #define FF_PROFILE_HEVC_MAIN_10 2
2911 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2912 #define FF_PROFILE_HEVC_REXT 4
2916 * - encoding: Set by user.
2917 * - decoding: Set by libavcodec.
2920 #define FF_LEVEL_UNKNOWN -99
2923 * Skip loop filtering for selected frames.
2924 * - encoding: unused
2925 * - decoding: Set by user.
2927 enum AVDiscard skip_loop_filter;
2930 * Skip IDCT/dequantization for selected frames.
2931 * - encoding: unused
2932 * - decoding: Set by user.
2934 enum AVDiscard skip_idct;
2937 * Skip decoding for selected frames.
2938 * - encoding: unused
2939 * - decoding: Set by user.
2941 enum AVDiscard skip_frame;
2944 * Header containing style information for text subtitles.
2945 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2946 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2947 * the Format line following. It shouldn't include any Dialogue line.
2948 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2949 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2951 uint8_t *subtitle_header;
2952 int subtitle_header_size;
2954 #if FF_API_ERROR_RATE
2956 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2959 attribute_deprecated
2963 #if FF_API_CODEC_PKT
2965 * @deprecated this field is not supposed to be accessed from outside lavc
2967 attribute_deprecated
2972 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2973 * Used for compliant TS muxing.
2974 * - encoding: Set by libavcodec.
2975 * - decoding: unused.
2980 * Encoding only. Allow encoders to output packets that do not contain any
2981 * encoded data, only side data.
2983 * Some encoders need to output such packets, e.g. to update some stream
2984 * parameters at the end of encoding.
2986 * All callers are strongly recommended to set this option to 1 and update
2987 * their code to deal with such packets, since this behaviour may become
2988 * always enabled in the future (then this option will be deprecated and
2989 * later removed). To avoid ABI issues when this happens, the callers should
2990 * use AVOptions to set this field.
2992 int side_data_only_packets;
2995 * Audio only. The number of "priming" samples (padding) inserted by the
2996 * encoder at the beginning of the audio. I.e. this number of leading
2997 * decoded samples must be discarded by the caller to get the original audio
2998 * without leading padding.
3000 * - decoding: unused
3001 * - encoding: Set by libavcodec. The timestamps on the output packets are
3002 * adjusted by the encoder so that they always refer to the
3003 * first sample of the data actually contained in the packet,
3004 * including any added padding. E.g. if the timebase is
3005 * 1/samplerate and the timestamp of the first input sample is
3006 * 0, the timestamp of the first output packet will be
3009 int initial_padding;
3012 * - decoding: For codecs that store a framerate value in the compressed
3013 * bitstream, the decoder may export it here. { 0, 1} when
3015 * - encoding: unused
3017 AVRational framerate;
3020 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3021 * - encoding: unused.
3022 * - decoding: Set by libavcodec before calling get_format()
3024 enum AVPixelFormat sw_pix_fmt;
3027 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3028 * Code outside libavcodec should access this field using:
3029 * av_codec_{get,set}_pkt_timebase(avctx)
3030 * - encoding unused.
3031 * - decoding set by user.
3033 AVRational pkt_timebase;
3037 * Code outside libavcodec should access this field using:
3038 * av_codec_{get,set}_codec_descriptor(avctx)
3039 * - encoding: unused.
3040 * - decoding: set by libavcodec.
3042 const AVCodecDescriptor *codec_descriptor;
3046 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3047 * - encoding: unused
3048 * - decoding: Set by user.
3049 * Code outside libavcodec should access this field using:
3050 * av_codec_{get,set}_lowres(avctx)
3056 * Current statistics for PTS correction.
3057 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3058 * - encoding: unused
3060 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3061 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3062 int64_t pts_correction_last_pts; /// PTS of the last frame
3063 int64_t pts_correction_last_dts; /// DTS of the last frame
3066 * Character encoding of the input subtitles file.
3067 * - decoding: set by user
3068 * - encoding: unused
3073 * Subtitles character encoding mode. Formats or codecs might be adjusting
3074 * this setting (if they are doing the conversion themselves for instance).
3075 * - decoding: set by libavcodec
3076 * - encoding: unused
3078 int sub_charenc_mode;
3079 #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)
3080 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3081 #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
3084 * Skip processing alpha if supported by codec.
3085 * Note that if the format uses pre-multiplied alpha (common with VP6,
3086 * and recommended due to better video quality/compression)
3087 * the image will look as if alpha-blended onto a black background.
3088 * However for formats that do not use pre-multiplied alpha
3089 * there might be serious artefacts (though e.g. libswscale currently
3090 * assumes pre-multiplied alpha anyway).
3091 * Code outside libavcodec should access this field using AVOptions
3093 * - decoding: set by user
3094 * - encoding: unused
3099 * Number of samples to skip after a discontinuity
3100 * - decoding: unused
3101 * - encoding: set by libavcodec
3105 #if !FF_API_DEBUG_MV
3107 * debug motion vectors
3108 * Code outside libavcodec should access this field using AVOptions
3109 * - encoding: Set by user.
3110 * - decoding: Set by user.
3113 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3114 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3115 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3119 * custom intra quantization matrix
3120 * Code outside libavcodec should access this field using av_codec_g/set_chroma_intra_matrix()
3121 * - encoding: Set by user, can be NULL.
3122 * - decoding: unused.
3124 uint16_t *chroma_intra_matrix;
3127 * dump format separator.
3128 * can be ", " or "\n " or anything else
3129 * Code outside libavcodec should access this field using AVOptions
3130 * (NO direct access).
3131 * - encoding: Set by user.
3132 * - decoding: Set by user.
3134 uint8_t *dump_separator;
3137 * ',' separated list of allowed decoders.
3138 * If NULL then all are allowed
3139 * - encoding: unused
3140 * - decoding: set by user through AVOPtions (NO direct access)
3142 char *codec_whitelist;
3145 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3146 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3148 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3149 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3151 int av_codec_get_lowres(const AVCodecContext *avctx);
3152 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3154 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3155 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3157 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3158 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3163 typedef struct AVProfile {
3165 const char *name; ///< short name for the profile
3168 typedef struct AVCodecDefault AVCodecDefault;
3175 typedef struct AVCodec {
3177 * Name of the codec implementation.
3178 * The name is globally unique among encoders and among decoders (but an
3179 * encoder and a decoder can share the same name).
3180 * This is the primary way to find a codec from the user perspective.
3184 * Descriptive name for the codec, meant to be more human readable than name.
3185 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3187 const char *long_name;
3188 enum AVMediaType type;
3191 * Codec capabilities.
3195 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3196 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3197 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3198 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3199 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3201 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder, no direct access, use av_codec_get_max_lowres()
3203 const AVClass *priv_class; ///< AVClass for the private context
3204 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3206 /*****************************************************************
3207 * No fields below this line are part of the public API. They
3208 * may not be used outside of libavcodec and can be changed and
3210 * New public fields should be added right above.
3211 *****************************************************************
3214 struct AVCodec *next;
3216 * @name Frame-level threading support functions
3220 * If defined, called on thread contexts when they are created.
3221 * If the codec allocates writable tables in init(), re-allocate them here.
3222 * priv_data will be set to a copy of the original.
3224 int (*init_thread_copy)(AVCodecContext *);
3226 * Copy necessary context variables from a previous thread context to the current one.
3227 * If not defined, the next thread will start automatically; otherwise, the codec
3228 * must call ff_thread_finish_setup().
3230 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3232 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3236 * Private codec-specific defaults.
3238 const AVCodecDefault *defaults;
3241 * Initialize codec static data, called from avcodec_register().
3243 void (*init_static_data)(struct AVCodec *codec);
3245 int (*init)(AVCodecContext *);
3246 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3247 const struct AVSubtitle *sub);
3249 * Encode data to an AVPacket.
3251 * @param avctx codec context
3252 * @param avpkt output AVPacket (may contain a user-provided buffer)
3253 * @param[in] frame AVFrame containing the raw data to be encoded
3254 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3255 * non-empty packet was returned in avpkt.
3256 * @return 0 on success, negative error code on failure
3258 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3259 int *got_packet_ptr);
3260 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3261 int (*close)(AVCodecContext *);
3264 * Will be called when seeking
3266 void (*flush)(AVCodecContext *);
3268 * Internal codec capabilities.
3269 * See FF_CODEC_CAP_* in internal.h
3274 int av_codec_get_max_lowres(const AVCodec *codec);
3276 struct MpegEncContext;
3279 * @defgroup lavc_hwaccel AVHWAccel
3282 typedef struct AVHWAccel {
3284 * Name of the hardware accelerated codec.
3285 * The name is globally unique among encoders and among decoders (but an
3286 * encoder and a decoder can share the same name).
3291 * Type of codec implemented by the hardware accelerator.
3293 * See AVMEDIA_TYPE_xxx
3295 enum AVMediaType type;
3298 * Codec implemented by the hardware accelerator.
3300 * See AV_CODEC_ID_xxx
3305 * Supported pixel format.
3307 * Only hardware accelerated formats are supported here.
3309 enum AVPixelFormat pix_fmt;
3312 * Hardware accelerated codec capabilities.
3313 * see FF_HWACCEL_CODEC_CAP_*
3317 /*****************************************************************
3318 * No fields below this line are part of the public API. They
3319 * may not be used outside of libavcodec and can be changed and
3321 * New public fields should be added right above.
3322 *****************************************************************
3324 struct AVHWAccel *next;
3327 * Allocate a custom buffer
3329 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3332 * Called at the beginning of each frame or field picture.
3334 * Meaningful frame information (codec specific) is guaranteed to
3335 * be parsed at this point. This function is mandatory.
3337 * Note that buf can be NULL along with buf_size set to 0.
3338 * Otherwise, this means the whole frame is available at this point.
3340 * @param avctx the codec context
3341 * @param buf the frame data buffer base
3342 * @param buf_size the size of the frame in bytes
3343 * @return zero if successful, a negative value otherwise
3345 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3348 * Callback for each slice.
3350 * Meaningful slice information (codec specific) is guaranteed to
3351 * be parsed at this point. This function is mandatory.
3352 * The only exception is XvMC, that works on MB level.
3354 * @param avctx the codec context
3355 * @param buf the slice data buffer base
3356 * @param buf_size the size of the slice in bytes
3357 * @return zero if successful, a negative value otherwise
3359 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3362 * Called at the end of each frame or field picture.
3364 * The whole picture is parsed at this point and can now be sent
3365 * to the hardware accelerator. This function is mandatory.
3367 * @param avctx the codec context
3368 * @return zero if successful, a negative value otherwise
3370 int (*end_frame)(AVCodecContext *avctx);
3373 * Size of per-frame hardware accelerator private data.
3375 * Private data is allocated with av_mallocz() before
3376 * AVCodecContext.get_buffer() and deallocated after
3377 * AVCodecContext.release_buffer().
3379 int frame_priv_data_size;
3382 * Called for every Macroblock in a slice.
3384 * XvMC uses it to replace the ff_mpv_decode_mb().
3385 * Instead of decoding to raw picture, MB parameters are
3386 * stored in an array provided by the video driver.
3388 * @param s the mpeg context
3390 void (*decode_mb)(struct MpegEncContext *s);
3393 * Initialize the hwaccel private data.
3395 * This will be called from ff_get_format(), after hwaccel and
3396 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3399 int (*init)(AVCodecContext *avctx);
3402 * Uninitialize the hwaccel private data.
3404 * This will be called from get_format() or avcodec_close(), after hwaccel
3405 * and hwaccel_context are already uninitialized.
3407 int (*uninit)(AVCodecContext *avctx);
3410 * Size of the private data to allocate in
3411 * AVCodecInternal.hwaccel_priv_data.
3417 * Hardware acceleration should be used for decoding even if the codec level
3418 * used is unknown or higher than the maximum supported level reported by the
3421 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3424 * Hardware acceleration can output YUV pixel formats with a different chroma
3425 * sampling than 4:2:0 and/or other than 8 bits per component.
3427 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3434 * @defgroup lavc_picture AVPicture
3436 * Functions for working with AVPicture
3441 * Picture data structure.
3443 * Up to four components can be stored into it, the last component is
3446 typedef struct AVPicture {
3447 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3448 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3455 enum AVSubtitleType {
3458 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3461 * Plain text, the text field must be set by the decoder and is
3462 * authoritative. ass and pict fields may contain approximations.
3467 * Formatted text, the ass field must be set by the decoder and is
3468 * authoritative. pict and text fields may contain approximations.
3473 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3475 typedef struct AVSubtitleRect {
3476 int x; ///< top left corner of pict, undefined when pict is not set
3477 int y; ///< top left corner of pict, undefined when pict is not set
3478 int w; ///< width of pict, undefined when pict is not set
3479 int h; ///< height of pict, undefined when pict is not set
3480 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3483 * data+linesize for the bitmap of this subtitle.
3484 * can be set for text/ass as well once they are rendered
3487 enum AVSubtitleType type;
3489 char *text; ///< 0 terminated plain UTF-8 text
3492 * 0 terminated ASS/SSA compatible event line.
3493 * The presentation of this is unaffected by the other values in this
3501 typedef struct AVSubtitle {
3502 uint16_t format; /* 0 = graphics */
3503 uint32_t start_display_time; /* relative to packet pts, in ms */
3504 uint32_t end_display_time; /* relative to packet pts, in ms */
3506 AVSubtitleRect **rects;
3507 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3511 * If c is NULL, returns the first registered codec,
3512 * if c is non-NULL, returns the next registered codec after c,
3513 * or NULL if c is the last one.
3515 AVCodec *av_codec_next(const AVCodec *c);
3518 * Return the LIBAVCODEC_VERSION_INT constant.
3520 unsigned avcodec_version(void);
3523 * Return the libavcodec build-time configuration.
3525 const char *avcodec_configuration(void);
3528 * Return the libavcodec license.
3530 const char *avcodec_license(void);
3533 * Register the codec codec and initialize libavcodec.
3535 * @warning either this function or avcodec_register_all() must be called
3536 * before any other libavcodec functions.
3538 * @see avcodec_register_all()
3540 void avcodec_register(AVCodec *codec);
3543 * Register all the codecs, parsers and bitstream filters which were enabled at
3544 * configuration time. If you do not call this function you can select exactly
3545 * which formats you want to support, by using the individual registration
3548 * @see avcodec_register
3549 * @see av_register_codec_parser
3550 * @see av_register_bitstream_filter
3552 void avcodec_register_all(void);
3555 * Allocate an AVCodecContext and set its fields to default values. The
3556 * resulting struct should be freed with avcodec_free_context().
3558 * @param codec if non-NULL, allocate private data and initialize defaults
3559 * for the given codec. It is illegal to then call avcodec_open2()
3560 * with a different codec.
3561 * If NULL, then the codec-specific defaults won't be initialized,
3562 * which may result in suboptimal default settings (this is
3563 * important mainly for encoders, e.g. libx264).
3565 * @return An AVCodecContext filled with default values or NULL on failure.
3566 * @see avcodec_get_context_defaults
3568 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3571 * Free the codec context and everything associated with it and write NULL to
3572 * the provided pointer.
3574 void avcodec_free_context(AVCodecContext **avctx);
3577 * Set the fields of the given AVCodecContext to default values corresponding
3578 * to the given codec (defaults may be codec-dependent).
3580 * Do not call this function if a non-NULL codec has been passed
3581 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3582 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3583 * different codec on this AVCodecContext.
3585 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3588 * Get the AVClass for AVCodecContext. It can be used in combination with
3589 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3591 * @see av_opt_find().
3593 const AVClass *avcodec_get_class(void);
3596 * Get the AVClass for AVFrame. It can be used in combination with
3597 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3599 * @see av_opt_find().
3601 const AVClass *avcodec_get_frame_class(void);
3604 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3605 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3607 * @see av_opt_find().
3609 const AVClass *avcodec_get_subtitle_rect_class(void);
3612 * Copy the settings of the source AVCodecContext into the destination
3613 * AVCodecContext. The resulting destination codec context will be
3614 * unopened, i.e. you are required to call avcodec_open2() before you
3615 * can use this AVCodecContext to decode/encode video/audio data.
3617 * @param dest target codec context, should be initialized with
3618 * avcodec_alloc_context3(NULL), but otherwise uninitialized
3619 * @param src source codec context
3620 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3622 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3624 #if FF_API_AVFRAME_LAVC
3626 * @deprecated use av_frame_alloc()
3628 attribute_deprecated
3629 AVFrame *avcodec_alloc_frame(void);
3632 * Set the fields of the given AVFrame to default values.
3634 * @param frame The AVFrame of which the fields should be set to default values.
3636 * @deprecated use av_frame_unref()
3638 attribute_deprecated
3639 void avcodec_get_frame_defaults(AVFrame *frame);
3642 * Free the frame and any dynamically allocated objects in it,
3643 * e.g. extended_data.
3645 * @param frame frame to be freed. The pointer will be set to NULL.
3647 * @warning this function does NOT free the data buffers themselves
3648 * (it does not know how, since they might have been allocated with
3649 * a custom get_buffer()).
3651 * @deprecated use av_frame_free()
3653 attribute_deprecated
3654 void avcodec_free_frame(AVFrame **frame);
3658 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3659 * function the context has to be allocated with avcodec_alloc_context3().
3661 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3662 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3663 * retrieving a codec.
3665 * @warning This function is not thread safe!
3667 * @note Always call this function before using decoding routines (such as
3668 * @ref avcodec_decode_video2()).
3671 * avcodec_register_all();
3672 * av_dict_set(&opts, "b", "2.5M", 0);
3673 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3677 * context = avcodec_alloc_context3(codec);
3679 * if (avcodec_open2(context, codec, opts) < 0)
3683 * @param avctx The context to initialize.
3684 * @param codec The codec to open this context for. If a non-NULL codec has been
3685 * previously passed to avcodec_alloc_context3() or
3686 * avcodec_get_context_defaults3() for this context, then this
3687 * parameter MUST be either NULL or equal to the previously passed
3689 * @param options A dictionary filled with AVCodecContext and codec-private options.
3690 * On return this object will be filled with options that were not found.
3692 * @return zero on success, a negative value on error
3693 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3694 * av_dict_set(), av_opt_find().
3696 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3699 * Close a given AVCodecContext and free all the data associated with it
3700 * (but not the AVCodecContext itself).
3702 * Calling this function on an AVCodecContext that hasn't been opened will free
3703 * the codec-specific data allocated in avcodec_alloc_context3() /
3704 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3707 int avcodec_close(AVCodecContext *avctx);
3710 * Free all allocated data in the given subtitle struct.
3712 * @param sub AVSubtitle to free.
3714 void avsubtitle_free(AVSubtitle *sub);
3721 * @addtogroup lavc_packet
3725 #if FF_API_DESTRUCT_PACKET
3727 * Default packet destructor.
3728 * @deprecated use the AVBuffer API instead
3730 attribute_deprecated
3731 void av_destruct_packet(AVPacket *pkt);
3735 * Initialize optional fields of a packet with default values.
3737 * Note, this does not touch the data and size members, which have to be
3738 * initialized separately.
3742 void av_init_packet(AVPacket *pkt);
3745 * Allocate the payload of a packet and initialize its fields with
3749 * @param size wanted payload size
3750 * @return 0 if OK, AVERROR_xxx otherwise
3752 int av_new_packet(AVPacket *pkt, int size);
3755 * Reduce packet size, correctly zeroing padding
3758 * @param size new size
3760 void av_shrink_packet(AVPacket *pkt, int size);
3763 * Increase packet size, correctly zeroing padding
3766 * @param grow_by number of bytes by which to increase the size of the packet
3768 int av_grow_packet(AVPacket *pkt, int grow_by);
3771 * Initialize a reference-counted packet from av_malloc()ed data.
3773 * @param pkt packet to be initialized. This function will set the data, size,
3774 * buf and destruct fields, all others are left untouched.
3775 * @param data Data allocated by av_malloc() to be used as packet data. If this
3776 * function returns successfully, the data is owned by the underlying AVBuffer.
3777 * The caller may not access the data through other means.
3778 * @param size size of data in bytes, without the padding. I.e. the full buffer
3779 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3781 * @return 0 on success, a negative AVERROR on error
3783 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3786 * @warning This is a hack - the packet memory allocation stuff is broken. The
3787 * packet is allocated if it was not really allocated.
3789 int av_dup_packet(AVPacket *pkt);
3792 * Copy packet, including contents
3794 * @return 0 on success, negative AVERROR on fail
3796 int av_copy_packet(AVPacket *dst, const AVPacket *src);
3799 * Copy packet side data
3801 * @return 0 on success, negative AVERROR on fail
3803 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
3808 * @param pkt packet to free
3810 void av_free_packet(AVPacket *pkt);
3813 * Allocate new information of a packet.
3816 * @param type side information type
3817 * @param size side information size
3818 * @return pointer to fresh allocated data or NULL otherwise
3820 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3824 * Shrink the already allocated side data buffer
3827 * @param type side information type
3828 * @param size new side information size
3829 * @return 0 on success, < 0 on failure
3831 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3835 * Get side information from packet.
3838 * @param type desired side information type
3839 * @param size pointer for side information size to store (optional)
3840 * @return pointer to data if present or NULL otherwise
3842 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3845 int av_packet_merge_side_data(AVPacket *pkt);
3847 int av_packet_split_side_data(AVPacket *pkt);
3850 * Pack a dictionary for use in side_data.
3852 * @param dict The dictionary to pack.
3853 * @param size pointer to store the size of the returned data
3854 * @return pointer to data if successful, NULL otherwise
3856 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
3858 * Unpack a dictionary from side_data.
3860 * @param data data from side_data
3861 * @param size size of the data
3862 * @param dict the metadata storage dictionary
3863 * @return 0 on success, < 0 on failure
3865 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
3869 * Convenience function to free all the side data stored.
3870 * All the other fields stay untouched.
3874 void av_packet_free_side_data(AVPacket *pkt);
3877 * Setup a new reference to the data described by a given packet
3879 * If src is reference-counted, setup dst as a new reference to the
3880 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3881 * data from src into it.
3883 * All the other fields are copied from src.
3885 * @see av_packet_unref
3887 * @param dst Destination packet
3888 * @param src Source packet
3890 * @return 0 on success, a negative AVERROR on error.
3892 int av_packet_ref(AVPacket *dst, const AVPacket *src);
3897 * Unreference the buffer referenced by the packet and reset the
3898 * remaining packet fields to their default values.
3900 * @param pkt The packet to be unreferenced.
3902 void av_packet_unref(AVPacket *pkt);
3905 * Move every field in src to dst and reset src.
3907 * @see av_packet_unref
3909 * @param src Source packet, will be reset
3910 * @param dst Destination packet
3912 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3915 * Copy only "properties" fields from src to dst.
3917 * Properties for the purpose of this function are all the fields
3918 * beside those related to the packet data (buf, data, size)
3920 * @param dst Destination packet
3921 * @param src Source packet
3923 * @return 0 on success AVERROR on failure.
3926 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3929 * Convert valid timing fields (timestamps / durations) in a packet from one
3930 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
3933 * @param pkt packet on which the conversion will be performed
3934 * @param tb_src source timebase, in which the timing fields in pkt are
3936 * @param tb_dst destination timebase, to which the timing fields will be
3939 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
3946 * @addtogroup lavc_decoding
3951 * Find a registered decoder with a matching codec ID.
3953 * @param id AVCodecID of the requested decoder
3954 * @return A decoder if one was found, NULL otherwise.
3956 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3959 * Find a registered decoder with the specified name.
3961 * @param name name of the requested decoder
3962 * @return A decoder if one was found, NULL otherwise.
3964 AVCodec *avcodec_find_decoder_by_name(const char *name);
3966 #if FF_API_GET_BUFFER
3967 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3968 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3969 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3973 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3974 * it can be called by custom get_buffer2() implementations for decoders without
3975 * CODEC_CAP_DR1 set.
3977 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3981 * Return the amount of padding in pixels which the get_buffer callback must
3982 * provide around the edge of the image for codecs which do not have the
3983 * CODEC_FLAG_EMU_EDGE flag.
3985 * @return Required padding in pixels.
3987 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3990 attribute_deprecated
3991 unsigned avcodec_get_edge_width(void);
3995 * Modify width and height values so that they will result in a memory
3996 * buffer that is acceptable for the codec if you do not use any horizontal
3999 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4001 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4004 * Modify width and height values so that they will result in a memory
4005 * buffer that is acceptable for the codec if you also ensure that all
4006 * line sizes are a multiple of the respective linesize_align[i].
4008 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
4010 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4011 int linesize_align[AV_NUM_DATA_POINTERS]);
4014 * Converts AVChromaLocation to swscale x/y chroma position.
4016 * The positions represent the chroma (0,0) position in a coordinates system
4017 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4019 * @param xpos horizontal chroma sample position
4020 * @param ypos vertical chroma sample position
4022 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4025 * Converts swscale x/y chroma position to AVChromaLocation.
4027 * The positions represent the chroma (0,0) position in a coordinates system
4028 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4030 * @param xpos horizontal chroma sample position
4031 * @param ypos vertical chroma sample position
4033 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4035 #if FF_API_OLD_DECODE_AUDIO
4037 * Wrapper function which calls avcodec_decode_audio4.
4039 * @deprecated Use avcodec_decode_audio4 instead.
4041 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
4042 * Some decoders may support multiple frames in a single AVPacket, such
4043 * decoders would then just decode the first frame. In this case,
4044 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
4045 * the remaining data in order to decode the second frame etc.
4047 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
4048 * decompressed frame size in bytes.
4050 * @warning You must set frame_size_ptr to the allocated size of the
4051 * output buffer before calling avcodec_decode_audio3().
4053 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4054 * the actual read bytes because some optimized bitstream readers read 32 or 64
4055 * bits at once and could read over the end.
4057 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
4058 * no overreading happens for damaged MPEG streams.
4060 * @warning You must not provide a custom get_buffer() when using
4061 * avcodec_decode_audio3(). Doing so will override it with
4062 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
4063 * which does allow the application to provide a custom get_buffer().
4065 * @note You might have to align the input buffer avpkt->data and output buffer
4066 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
4067 * necessary at all, on others it won't work at all if not aligned and on others
4068 * it will work but it will have an impact on performance.
4070 * In practice, avpkt->data should have 4 byte alignment at minimum and
4071 * samples should be 16 byte aligned unless the CPU doesn't need it
4072 * (AltiVec and SSE do).
4074 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4075 * between input and output, these need to be fed with avpkt->data=NULL,
4076 * avpkt->size=0 at the end to return the remaining frames.
4078 * @param avctx the codec context
4079 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
4080 * If the sample format is planar, each channel plane will
4081 * be the same size, with no padding between channels.
4082 * @param[in,out] frame_size_ptr the output buffer size in bytes
4083 * @param[in] avpkt The input AVPacket containing the input buffer.
4084 * You can create such packet with av_init_packet() and by then setting
4085 * data and size, some decoders might in addition need other fields.
4086 * All decoders are designed to use the least fields possible though.
4087 * @return On error a negative value is returned, otherwise the number of bytes
4088 * used or zero if no frame data was decompressed (used) from the input AVPacket.
4090 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
4091 int *frame_size_ptr,
4096 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4098 * Some decoders may support multiple frames in a single AVPacket. Such
4099 * decoders would then just decode the first frame and the return value would be
4100 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4101 * called again with an AVPacket containing the remaining data in order to
4102 * decode the second frame, etc... Even if no frames are returned, the packet
4103 * needs to be fed to the decoder with remaining data until it is completely
4104 * consumed or an error occurs.
4106 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4107 * and output. This means that for some packets they will not immediately
4108 * produce decoded output and need to be flushed at the end of decoding to get
4109 * all the decoded data. Flushing is done by calling this function with packets
4110 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4111 * returning samples. It is safe to flush even those decoders that are not
4112 * marked with CODEC_CAP_DELAY, then no samples will be returned.
4114 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
4115 * larger than the actual read bytes because some optimized bitstream
4116 * readers read 32 or 64 bits at once and could read over the end.
4118 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4119 * before packets may be fed to the decoder.
4121 * @param avctx the codec context
4122 * @param[out] frame The AVFrame in which to store decoded audio samples.
4123 * The decoder will allocate a buffer for the decoded frame by
4124 * calling the AVCodecContext.get_buffer2() callback.
4125 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4126 * reference counted and the returned reference belongs to the
4127 * caller. The caller must release the frame using av_frame_unref()
4128 * when the frame is no longer needed. The caller may safely write
4129 * to the frame if av_frame_is_writable() returns 1.
4130 * When AVCodecContext.refcounted_frames is set to 0, the returned
4131 * reference belongs to the decoder and is valid only until the
4132 * next call to this function or until closing or flushing the
4133 * decoder. The caller may not write to it.
4134 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4135 * non-zero. Note that this field being set to zero
4136 * does not mean that an error has occurred. For
4137 * decoders with CODEC_CAP_DELAY set, no given decode
4138 * call is guaranteed to produce a frame.
4139 * @param[in] avpkt The input AVPacket containing the input buffer.
4140 * At least avpkt->data and avpkt->size should be set. Some
4141 * decoders might also require additional fields to be set.
4142 * @return A negative error code is returned if an error occurred during
4143 * decoding, otherwise the number of bytes consumed from the input
4144 * AVPacket is returned.
4146 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4147 int *got_frame_ptr, const AVPacket *avpkt);
4150 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4151 * Some decoders may support multiple frames in a single AVPacket, such
4152 * decoders would then just decode the first frame.
4154 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
4155 * the actual read bytes because some optimized bitstream readers read 32 or 64
4156 * bits at once and could read over the end.
4158 * @warning The end of the input buffer buf should be set to 0 to ensure that
4159 * no overreading happens for damaged MPEG streams.
4161 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
4162 * between input and output, these need to be fed with avpkt->data=NULL,
4163 * avpkt->size=0 at the end to return the remaining frames.
4165 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4166 * before packets may be fed to the decoder.
4168 * @param avctx the codec context
4169 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4170 * Use av_frame_alloc() to get an AVFrame. The codec will
4171 * allocate memory for the actual bitmap by calling the
4172 * AVCodecContext.get_buffer2() callback.
4173 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4174 * reference counted and the returned reference belongs to the
4175 * caller. The caller must release the frame using av_frame_unref()
4176 * when the frame is no longer needed. The caller may safely write
4177 * to the frame if av_frame_is_writable() returns 1.
4178 * When AVCodecContext.refcounted_frames is set to 0, the returned
4179 * reference belongs to the decoder and is valid only until the
4180 * next call to this function or until closing or flushing the
4181 * decoder. The caller may not write to it.
4183 * @param[in] avpkt The input AVPacket containing the input buffer.
4184 * You can create such packet with av_init_packet() and by then setting
4185 * data and size, some decoders might in addition need other fields like
4186 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4188 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4189 * @return On error a negative value is returned, otherwise the number of bytes
4190 * used or zero if no frame could be decompressed.
4192 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4193 int *got_picture_ptr,
4194 const AVPacket *avpkt);
4197 * Decode a subtitle message.
4198 * Return a negative value on error, otherwise return the number of bytes used.
4199 * If no subtitle could be decompressed, got_sub_ptr is zero.
4200 * Otherwise, the subtitle is stored in *sub.
4201 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4202 * simplicity, because the performance difference is expect to be negligible
4203 * and reusing a get_buffer written for video codecs would probably perform badly
4204 * due to a potentially very different allocation pattern.
4206 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
4207 * and output. This means that for some packets they will not immediately
4208 * produce decoded output and need to be flushed at the end of decoding to get
4209 * all the decoded data. Flushing is done by calling this function with packets
4210 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4211 * returning subtitles. It is safe to flush even those decoders that are not
4212 * marked with CODEC_CAP_DELAY, then no subtitles will be returned.
4214 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4215 * before packets may be fed to the decoder.
4217 * @param avctx the codec context
4218 * @param[out] sub The Preallocated AVSubtitle in which the decoded subtitle will be stored,
4219 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4220 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4221 * @param[in] avpkt The input AVPacket containing the input buffer.
4223 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4228 * @defgroup lavc_parsing Frame parsing
4232 enum AVPictureStructure {
4233 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4234 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4235 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4236 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4239 typedef struct AVCodecParserContext {
4241 struct AVCodecParser *parser;
4242 int64_t frame_offset; /* offset of the current frame */
4243 int64_t cur_offset; /* current offset
4244 (incremented by each av_parser_parse()) */
4245 int64_t next_frame_offset; /* offset of the next frame */
4247 int pict_type; /* XXX: Put it back in AVCodecContext. */
4249 * This field is used for proper frame duration computation in lavf.
4250 * It signals, how much longer the frame duration of the current frame
4251 * is compared to normal frame duration.
4253 * frame_duration = (1 + repeat_pict) * time_base
4255 * It is used by codecs like H.264 to display telecined material.
4257 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4258 int64_t pts; /* pts of the current frame */
4259 int64_t dts; /* dts of the current frame */
4264 int fetch_timestamp;
4266 #define AV_PARSER_PTS_NB 4
4267 int cur_frame_start_index;
4268 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4269 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4270 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4273 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4274 #define PARSER_FLAG_ONCE 0x0002
4275 /// Set if the parser has a valid file offset
4276 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4277 #define PARSER_FLAG_USE_CODEC_TS 0x1000
4279 int64_t offset; ///< byte offset from starting packet start
4280 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4283 * Set by parser to 1 for key frames and 0 for non-key frames.
4284 * It is initialized to -1, so if the parser doesn't set this flag,
4285 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4291 * Time difference in stream time base units from the pts of this
4292 * packet to the point at which the output from the decoder has converged
4293 * independent from the availability of previous frames. That is, the
4294 * frames are virtually identical no matter if decoding started from
4295 * the very first frame or from this keyframe.
4296 * Is AV_NOPTS_VALUE if unknown.
4297 * This field is not the display duration of the current frame.
4298 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4301 * The purpose of this field is to allow seeking in streams that have no
4302 * keyframes in the conventional sense. It corresponds to the
4303 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4304 * essential for some types of subtitle streams to ensure that all
4305 * subtitles are correctly displayed after seeking.
4307 int64_t convergence_duration;
4309 // Timestamp generation support:
4311 * Synchronization point for start of timestamp generation.
4313 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4316 * For example, this corresponds to presence of H.264 buffering period
4322 * Offset of the current timestamp against last timestamp sync point in
4323 * units of AVCodecContext.time_base.
4325 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4326 * contain a valid timestamp offset.
4328 * Note that the timestamp of sync point has usually a nonzero
4329 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4330 * the next frame after timestamp sync point will be usually 1.
4332 * For example, this corresponds to H.264 cpb_removal_delay.
4334 int dts_ref_dts_delta;
4337 * Presentation delay of current frame in units of AVCodecContext.time_base.
4339 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4340 * contain valid non-negative timestamp delta (presentation time of a frame
4341 * must not lie in the past).
4343 * This delay represents the difference between decoding and presentation
4344 * time of the frame.
4346 * For example, this corresponds to H.264 dpb_output_delay.
4351 * Position of the packet in file.
4353 * Analogous to cur_frame_pts/dts
4355 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4358 * Byte position of currently parsed frame in stream.
4363 * Previous frame byte position.
4368 * Duration of the current frame.
4369 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4370 * For all other types, this is in units of AVCodecContext.time_base.
4374 enum AVFieldOrder field_order;
4377 * Indicate whether a picture is coded as a frame, top field or bottom field.
4379 * For example, H.264 field_pic_flag equal to 0 corresponds to
4380 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4381 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4382 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4384 enum AVPictureStructure picture_structure;
4387 * Picture number incremented in presentation or output order.
4388 * This field may be reinitialized at the first picture of a new sequence.
4390 * For example, this corresponds to H.264 PicOrderCnt.
4392 int output_picture_number;
4395 * Dimensions of the decoded video intended for presentation.
4401 * Dimensions of the coded video.
4407 * The format of the coded data, corresponds to enum AVPixelFormat for video
4408 * and for enum AVSampleFormat for audio.
4410 * Note that a decoder can have considerable freedom in how exactly it
4411 * decodes the data, so the format reported here might be different from the
4412 * one returned by a decoder.
4415 } AVCodecParserContext;
4417 typedef struct AVCodecParser {
4418 int codec_ids[5]; /* several codec IDs are permitted */
4420 int (*parser_init)(AVCodecParserContext *s);
4421 /* This callback never returns an error, a negative value means that
4422 * the frame start was in a previous packet. */
4423 int (*parser_parse)(AVCodecParserContext *s,
4424 AVCodecContext *avctx,
4425 const uint8_t **poutbuf, int *poutbuf_size,
4426 const uint8_t *buf, int buf_size);
4427 void (*parser_close)(AVCodecParserContext *s);
4428 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4429 struct AVCodecParser *next;
4432 AVCodecParser *av_parser_next(const AVCodecParser *c);
4434 void av_register_codec_parser(AVCodecParser *parser);
4435 AVCodecParserContext *av_parser_init(int codec_id);
4440 * @param s parser context.
4441 * @param avctx codec context.
4442 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4443 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4444 * @param buf input buffer.
4445 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4446 * @param pts input presentation timestamp.
4447 * @param dts input decoding timestamp.
4448 * @param pos input byte position in stream.
4449 * @return the number of bytes of the input bitstream used.
4454 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4461 * decode_frame(data, size);
4465 int av_parser_parse2(AVCodecParserContext *s,
4466 AVCodecContext *avctx,
4467 uint8_t **poutbuf, int *poutbuf_size,
4468 const uint8_t *buf, int buf_size,
4469 int64_t pts, int64_t dts,
4473 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4474 * @deprecated use AVBitStreamFilter
4476 int av_parser_change(AVCodecParserContext *s,
4477 AVCodecContext *avctx,
4478 uint8_t **poutbuf, int *poutbuf_size,
4479 const uint8_t *buf, int buf_size, int keyframe);
4480 void av_parser_close(AVCodecParserContext *s);
4488 * @addtogroup lavc_encoding
4493 * Find a registered encoder with a matching codec ID.
4495 * @param id AVCodecID of the requested encoder
4496 * @return An encoder if one was found, NULL otherwise.
4498 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4501 * Find a registered encoder with the specified name.
4503 * @param name name of the requested encoder
4504 * @return An encoder if one was found, NULL otherwise.
4506 AVCodec *avcodec_find_encoder_by_name(const char *name);
4508 #if FF_API_OLD_ENCODE_AUDIO
4510 * Encode an audio frame from samples into buf.
4512 * @deprecated Use avcodec_encode_audio2 instead.
4514 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4515 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4516 * will know how much space is needed because it depends on the value passed
4517 * in buf_size as described below. In that case a lower value can be used.
4519 * @param avctx the codec context
4520 * @param[out] buf the output buffer
4521 * @param[in] buf_size the output buffer size
4522 * @param[in] samples the input buffer containing the samples
4523 * The number of samples read from this buffer is frame_size*channels,
4524 * both of which are defined in avctx.
4525 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4526 * samples read from samples is equal to:
4527 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4528 * This also implies that av_get_bits_per_sample() must not return 0 for these
4530 * @return On error a negative value is returned, on success zero or the number
4531 * of bytes used to encode the data read from the input buffer.
4533 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4534 uint8_t *buf, int buf_size,
4535 const short *samples);
4539 * Encode a frame of audio.
4541 * Takes input samples from frame and writes the next output packet, if
4542 * available, to avpkt. The output packet does not necessarily contain data for
4543 * the most recent frame, as encoders can delay, split, and combine input frames
4544 * internally as needed.
4546 * @param avctx codec context
4547 * @param avpkt output AVPacket.
4548 * The user can supply an output buffer by setting
4549 * avpkt->data and avpkt->size prior to calling the
4550 * function, but if the size of the user-provided data is not
4551 * large enough, encoding will fail. If avpkt->data and
4552 * avpkt->size are set, avpkt->destruct must also be set. All
4553 * other AVPacket fields will be reset by the encoder using
4554 * av_init_packet(). If avpkt->data is NULL, the encoder will
4555 * allocate it. The encoder will set avpkt->size to the size
4556 * of the output packet.
4558 * If this function fails or produces no output, avpkt will be
4559 * freed using av_free_packet() (i.e. avpkt->destruct will be
4560 * called to free the user supplied buffer).
4561 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4562 * May be NULL when flushing an encoder that has the
4563 * CODEC_CAP_DELAY capability set.
4564 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4565 * can have any number of samples.
4566 * If it is not set, frame->nb_samples must be equal to
4567 * avctx->frame_size for all frames except the last.
4568 * The final frame may be smaller than avctx->frame_size.
4569 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4570 * output packet is non-empty, and to 0 if it is
4571 * empty. If the function returns an error, the
4572 * packet can be assumed to be invalid, and the
4573 * value of got_packet_ptr is undefined and should
4575 * @return 0 on success, negative error code on failure
4577 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4578 const AVFrame *frame, int *got_packet_ptr);
4580 #if FF_API_OLD_ENCODE_VIDEO
4582 * @deprecated use avcodec_encode_video2() instead.
4584 * Encode a video frame from pict into buf.
4585 * The input picture should be
4586 * stored using a specific format, namely avctx.pix_fmt.
4588 * @param avctx the codec context
4589 * @param[out] buf the output buffer for the bitstream of encoded frame
4590 * @param[in] buf_size the size of the output buffer in bytes
4591 * @param[in] pict the input picture to encode
4592 * @return On error a negative value is returned, on success zero or the number
4593 * of bytes used from the output buffer.
4595 attribute_deprecated
4596 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4597 const AVFrame *pict);
4601 * Encode a frame of video.
4603 * Takes input raw video data from frame and writes the next output packet, if
4604 * available, to avpkt. The output packet does not necessarily contain data for
4605 * the most recent frame, as encoders can delay and reorder input frames
4606 * internally as needed.
4608 * @param avctx codec context
4609 * @param avpkt output AVPacket.
4610 * The user can supply an output buffer by setting
4611 * avpkt->data and avpkt->size prior to calling the
4612 * function, but if the size of the user-provided data is not
4613 * large enough, encoding will fail. All other AVPacket fields
4614 * will be reset by the encoder using av_init_packet(). If
4615 * avpkt->data is NULL, the encoder will allocate it.
4616 * The encoder will set avpkt->size to the size of the
4617 * output packet. The returned data (if any) belongs to the
4618 * caller, he is responsible for freeing it.
4620 * If this function fails or produces no output, avpkt will be
4621 * freed using av_free_packet() (i.e. avpkt->destruct will be
4622 * called to free the user supplied buffer).
4623 * @param[in] frame AVFrame containing the raw video data to be encoded.
4624 * May be NULL when flushing an encoder that has the
4625 * CODEC_CAP_DELAY capability set.
4626 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4627 * output packet is non-empty, and to 0 if it is
4628 * empty. If the function returns an error, the
4629 * packet can be assumed to be invalid, and the
4630 * value of got_packet_ptr is undefined and should
4632 * @return 0 on success, negative error code on failure
4634 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4635 const AVFrame *frame, int *got_packet_ptr);
4637 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4638 const AVSubtitle *sub);
4645 #if FF_API_AVCODEC_RESAMPLE
4647 * @defgroup lavc_resample Audio resampling
4649 * @deprecated use libswresample instead
4653 struct ReSampleContext;
4654 struct AVResampleContext;
4656 typedef struct ReSampleContext ReSampleContext;
4659 * Initialize audio resampling context.
4661 * @param output_channels number of output channels
4662 * @param input_channels number of input channels
4663 * @param output_rate output sample rate
4664 * @param input_rate input sample rate
4665 * @param sample_fmt_out requested output sample format
4666 * @param sample_fmt_in input sample format
4667 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4668 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4669 * @param linear if 1 then the used FIR filter will be linearly interpolated
4670 between the 2 closest, if 0 the closest will be used
4671 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4672 * @return allocated ReSampleContext, NULL if error occurred
4674 attribute_deprecated
4675 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4676 int output_rate, int input_rate,
4677 enum AVSampleFormat sample_fmt_out,
4678 enum AVSampleFormat sample_fmt_in,
4679 int filter_length, int log2_phase_count,
4680 int linear, double cutoff);
4682 attribute_deprecated
4683 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4686 * Free resample context.
4688 * @param s a non-NULL pointer to a resample context previously
4689 * created with av_audio_resample_init()
4691 attribute_deprecated
4692 void audio_resample_close(ReSampleContext *s);
4696 * Initialize an audio resampler.
4697 * Note, if either rate is not an integer then simply scale both rates up so they are.
4698 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4699 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4700 * @param linear If 1 then the used FIR filter will be linearly interpolated
4701 between the 2 closest, if 0 the closest will be used
4702 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4704 attribute_deprecated
4705 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4708 * Resample an array of samples using a previously configured context.
4709 * @param src an array of unconsumed samples
4710 * @param consumed the number of samples of src which have been consumed are returned here
4711 * @param src_size the number of unconsumed samples available
4712 * @param dst_size the amount of space in samples available in dst
4713 * @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.
4714 * @return the number of samples written in dst or -1 if an error occurred
4716 attribute_deprecated
4717 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4721 * Compensate samplerate/timestamp drift. The compensation is done by changing
4722 * the resampler parameters, so no audible clicks or similar distortions occur
4723 * @param compensation_distance distance in output samples over which the compensation should be performed
4724 * @param sample_delta number of output samples which should be output less
4726 * example: av_resample_compensate(c, 10, 500)
4727 * here instead of 510 samples only 500 samples would be output
4729 * note, due to rounding the actual compensation might be slightly different,
4730 * especially if the compensation_distance is large and the in_rate used during init is small
4732 attribute_deprecated
4733 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4734 attribute_deprecated
4735 void av_resample_close(struct AVResampleContext *c);
4743 * @addtogroup lavc_picture
4748 * Allocate memory for the pixels of a picture and setup the AVPicture
4751 * Call avpicture_free() to free it.
4753 * @param picture the picture structure to be filled in
4754 * @param pix_fmt the pixel format of the picture
4755 * @param width the width of the picture
4756 * @param height the height of the picture
4757 * @return zero if successful, a negative error code otherwise
4759 * @see av_image_alloc(), avpicture_fill()
4761 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4764 * Free a picture previously allocated by avpicture_alloc().
4765 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4768 * @param picture the AVPicture to be freed
4770 void avpicture_free(AVPicture *picture);
4773 * Setup the picture fields based on the specified image parameters
4774 * and the provided image data buffer.
4776 * The picture fields are filled in by using the image data buffer
4777 * pointed to by ptr.
4779 * If ptr is NULL, the function will fill only the picture linesize
4780 * array and return the required size for the image buffer.
4782 * To allocate an image buffer and fill the picture data in one call,
4783 * use avpicture_alloc().
4785 * @param picture the picture to be filled in
4786 * @param ptr buffer where the image data is stored, or NULL
4787 * @param pix_fmt the pixel format of the image
4788 * @param width the width of the image in pixels
4789 * @param height the height of the image in pixels
4790 * @return the size in bytes required for src, a negative error code
4791 * in case of failure
4793 * @see av_image_fill_arrays()
4795 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
4796 enum AVPixelFormat pix_fmt, int width, int height);
4799 * Copy pixel data from an AVPicture into a buffer.
4801 * avpicture_get_size() can be used to compute the required size for
4802 * the buffer to fill.
4804 * @param src source picture with filled data
4805 * @param pix_fmt picture pixel format
4806 * @param width picture width
4807 * @param height picture height
4808 * @param dest destination buffer
4809 * @param dest_size destination buffer size in bytes
4810 * @return the number of bytes written to dest, or a negative value
4811 * (error code) on error, for example if the destination buffer is not
4814 * @see av_image_copy_to_buffer()
4816 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
4817 int width, int height,
4818 unsigned char *dest, int dest_size);
4821 * Calculate the size in bytes that a picture of the given width and height
4822 * would occupy if stored in the given picture format.
4824 * @param pix_fmt picture pixel format
4825 * @param width picture width
4826 * @param height picture height
4827 * @return the computed picture buffer size or a negative error code
4830 * @see av_image_get_buffer_size().
4832 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4834 #if FF_API_DEINTERLACE
4836 * deinterlace - if not supported return -1
4838 * @deprecated - use yadif (in libavfilter) instead
4840 attribute_deprecated
4841 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4842 enum AVPixelFormat pix_fmt, int width, int height);
4845 * Copy image src to dst. Wraps av_image_copy().
4847 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4848 enum AVPixelFormat pix_fmt, int width, int height);
4851 * Crop image top and left side.
4853 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4854 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4859 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4860 int padtop, int padbottom, int padleft, int padright, int *color);
4867 * @defgroup lavc_misc Utility functions
4870 * Miscellaneous utility functions related to both encoding and decoding
4876 * @defgroup lavc_misc_pixfmt Pixel formats
4878 * Functions for working with pixel formats.
4883 * Utility function to access log2_chroma_w log2_chroma_h from
4884 * the pixel format AVPixFmtDescriptor.
4886 * This function asserts that pix_fmt is valid. See av_pix_fmt_get_chroma_sub_sample
4887 * for one that returns a failure code and continues in case of invalid
4890 * @param[in] pix_fmt the pixel format
4891 * @param[out] h_shift store log2_chroma_w
4892 * @param[out] v_shift store log2_chroma_h
4894 * @see av_pix_fmt_get_chroma_sub_sample
4897 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4900 * Return a value representing the fourCC code associated to the
4901 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4904 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4907 * @deprecated see av_get_pix_fmt_loss()
4909 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4913 * Find the best pixel format to convert to given a certain source pixel
4914 * format. When converting from one pixel format to another, information loss
4915 * may occur. For example, when converting from RGB24 to GRAY, the color
4916 * information will be lost. Similarly, other losses occur when converting from
4917 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4918 * the given pixel formats should be used to suffer the least amount of loss.
4919 * The pixel formats from which it chooses one, are determined by the
4920 * pix_fmt_list parameter.
4923 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4924 * @param[in] src_pix_fmt source pixel format
4925 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4926 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4927 * @return The best pixel format to convert to or -1 if none was found.
4929 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
4930 enum AVPixelFormat src_pix_fmt,
4931 int has_alpha, int *loss_ptr);
4934 * @deprecated see av_find_best_pix_fmt_of_2()
4936 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4937 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4939 attribute_deprecated
4940 #if AV_HAVE_INCOMPATIBLE_LIBAV_ABI
4941 enum AVPixelFormat avcodec_find_best_pix_fmt2(const enum AVPixelFormat *pix_fmt_list,
4942 enum AVPixelFormat src_pix_fmt,
4943 int has_alpha, int *loss_ptr);
4945 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
4946 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4950 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4956 #if FF_API_SET_DIMENSIONS
4958 * @deprecated this function is not supposed to be used from outside of lavc
4960 attribute_deprecated
4961 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4965 * Put a string representing the codec tag codec_tag in buf.
4967 * @param buf buffer to place codec tag in
4968 * @param buf_size size in bytes of buf
4969 * @param codec_tag codec tag to assign
4970 * @return the length of the string that would have been generated if
4971 * enough space had been available, excluding the trailing null
4973 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4975 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4978 * Return a name for the specified profile, if available.
4980 * @param codec the codec that is searched for the given profile
4981 * @param profile the profile value for which a name is requested
4982 * @return A name for the profile if found, NULL otherwise.
4984 const char *av_get_profile_name(const AVCodec *codec, int profile);
4986 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4987 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4988 //FIXME func typedef
4991 * Fill AVFrame audio data and linesize pointers.
4993 * The buffer buf must be a preallocated buffer with a size big enough
4994 * to contain the specified samples amount. The filled AVFrame data
4995 * pointers will point to this buffer.
4997 * AVFrame extended_data channel pointers are allocated if necessary for
5000 * @param frame the AVFrame
5001 * frame->nb_samples must be set prior to calling the
5002 * function. This function fills in frame->data,
5003 * frame->extended_data, frame->linesize[0].
5004 * @param nb_channels channel count
5005 * @param sample_fmt sample format
5006 * @param buf buffer to use for frame data
5007 * @param buf_size size of buffer
5008 * @param align plane size sample alignment (0 = default)
5009 * @return >=0 on success, negative error code on failure
5010 * @todo return the size in bytes required to store the samples in
5011 * case of success, at the next libavutil bump
5013 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5014 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5015 int buf_size, int align);
5018 * Reset the internal decoder state / flush internal buffers. Should be called
5019 * e.g. when seeking or when switching to a different stream.
5021 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5022 * this invalidates the frames previously returned from the decoder. When
5023 * refcounted frames are used, the decoder just releases any references it might
5024 * keep internally, but the caller's reference remains valid.
5026 void avcodec_flush_buffers(AVCodecContext *avctx);
5029 * Return codec bits per sample.
5031 * @param[in] codec_id the codec
5032 * @return Number of bits per sample or zero if unknown for the given codec.
5034 int av_get_bits_per_sample(enum AVCodecID codec_id);
5037 * Return the PCM codec associated with a sample format.
5038 * @param be endianness, 0 for little, 1 for big,
5039 * -1 (or anything else) for native
5040 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5042 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5045 * Return codec bits per sample.
5046 * Only return non-zero if the bits per sample is exactly correct, not an
5049 * @param[in] codec_id the codec
5050 * @return Number of bits per sample or zero if unknown for the given codec.
5052 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5055 * Return audio frame duration.
5057 * @param avctx codec context
5058 * @param frame_bytes size of the frame, or 0 if unknown
5059 * @return frame duration, in samples, if known. 0 if not able to
5062 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5065 typedef struct AVBitStreamFilterContext {
5067 struct AVBitStreamFilter *filter;
5068 AVCodecParserContext *parser;
5069 struct AVBitStreamFilterContext *next;
5070 } AVBitStreamFilterContext;
5073 typedef struct AVBitStreamFilter {
5076 int (*filter)(AVBitStreamFilterContext *bsfc,
5077 AVCodecContext *avctx, const char *args,
5078 uint8_t **poutbuf, int *poutbuf_size,
5079 const uint8_t *buf, int buf_size, int keyframe);
5080 void (*close)(AVBitStreamFilterContext *bsfc);
5081 struct AVBitStreamFilter *next;
5082 } AVBitStreamFilter;
5085 * Register a bitstream filter.
5087 * The filter will be accessible to the application code through
5088 * av_bitstream_filter_next() or can be directly initialized with
5089 * av_bitstream_filter_init().
5091 * @see avcodec_register_all()
5093 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5096 * Create and initialize a bitstream filter context given a bitstream
5099 * The returned context must be freed with av_bitstream_filter_close().
5101 * @param name the name of the bitstream filter
5102 * @return a bitstream filter context if a matching filter was found
5103 * and successfully initialized, NULL otherwise
5105 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5110 * This function filters the buffer buf with size buf_size, and places the
5111 * filtered buffer in the buffer pointed to by poutbuf.
5113 * The output buffer must be freed by the caller.
5115 * @param bsfc bitstream filter context created by av_bitstream_filter_init()
5116 * @param avctx AVCodecContext accessed by the filter, may be NULL.
5117 * If specified, this must point to the encoder context of the
5118 * output stream the packet is sent to.
5119 * @param args arguments which specify the filter configuration, may be NULL
5120 * @param poutbuf pointer which is updated to point to the filtered buffer
5121 * @param poutbuf_size pointer which is updated to the filtered buffer size in bytes
5122 * @param buf buffer containing the data to filter
5123 * @param buf_size size in bytes of buf
5124 * @param keyframe set to non-zero if the buffer to filter corresponds to a key-frame packet data
5125 * @return >= 0 in case of success, or a negative error code in case of failure
5127 * If the return value is positive, an output buffer is allocated and
5128 * is available in *poutbuf, and is distinct from the input buffer.
5130 * If the return value is 0, the output buffer is not allocated and
5131 * should be considered identical to the input buffer, or in case
5132 * *poutbuf was set it points to the input buffer (not necessarily to
5133 * its starting address).
5135 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5136 AVCodecContext *avctx, const char *args,
5137 uint8_t **poutbuf, int *poutbuf_size,
5138 const uint8_t *buf, int buf_size, int keyframe);
5141 * Release bitstream filter context.
5143 * @param bsf the bitstream filter context created with
5144 * av_bitstream_filter_init(), can be NULL
5146 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5149 * If f is NULL, return the first registered bitstream filter,
5150 * if f is non-NULL, return the next registered bitstream filter
5151 * after f, or NULL if f is the last one.
5153 * This function can be used to iterate over all registered bitstream
5156 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5161 * Same behaviour av_fast_malloc but the buffer has additional
5162 * FF_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
5164 * In addition the whole buffer will initially and after resizes
5165 * be 0-initialized so that no uninitialized data will ever appear.
5167 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5170 * Same behaviour av_fast_padded_malloc except that buffer will always
5171 * be 0-initialized after call.
5173 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
5176 * Encode extradata length to a buffer. Used by xiph codecs.
5178 * @param s buffer to write to; must be at least (v/255+1) bytes long
5179 * @param v size of extradata in bytes
5180 * @return number of bytes written to the buffer.
5182 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5184 #if FF_API_MISSING_SAMPLE
5186 * Log a generic warning message about a missing feature. This function is
5187 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5188 * only, and would normally not be used by applications.
5189 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5190 * a pointer to an AVClass struct
5191 * @param[in] feature string containing the name of the missing feature
5192 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
5193 * If want_sample is non-zero, additional verbage will be added to the log
5194 * message which tells the user how to report samples to the development
5196 * @deprecated Use avpriv_report_missing_feature() instead.
5198 attribute_deprecated
5199 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
5202 * Log a generic warning message asking for a sample. This function is
5203 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
5204 * only, and would normally not be used by applications.
5205 * @param[in] avc a pointer to an arbitrary struct of which the first field is
5206 * a pointer to an AVClass struct
5207 * @param[in] msg string containing an optional message, or NULL if no message
5208 * @deprecated Use avpriv_request_sample() instead.
5210 attribute_deprecated
5211 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
5212 #endif /* FF_API_MISSING_SAMPLE */
5215 * Register the hardware accelerator hwaccel.
5217 void av_register_hwaccel(AVHWAccel *hwaccel);
5220 * If hwaccel is NULL, returns the first registered hardware accelerator,
5221 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5222 * after hwaccel, or NULL if hwaccel is the last one.
5224 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5228 * Lock operation used by lockmgr
5231 AV_LOCK_CREATE, ///< Create a mutex
5232 AV_LOCK_OBTAIN, ///< Lock the mutex
5233 AV_LOCK_RELEASE, ///< Unlock the mutex
5234 AV_LOCK_DESTROY, ///< Free mutex resources
5238 * Register a user provided lock manager supporting the operations
5239 * specified by AVLockOp. The "mutex" argument to the function points
5240 * to a (void *) where the lockmgr should store/get a pointer to a user
5241 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5242 * value left by the last call for all other ops. If the lock manager is
5243 * unable to perform the op then it should leave the mutex in the same
5244 * state as when it was called and return a non-zero value. However,
5245 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5246 * have been successfully destroyed. If av_lockmgr_register succeeds
5247 * it will return a non-negative value, if it fails it will return a
5248 * negative value and destroy all mutex and unregister all callbacks.
5249 * av_lockmgr_register is not thread-safe, it must be called from a
5250 * single thread before any calls which make use of locking are used.
5252 * @param cb User defined callback. av_lockmgr_register invokes calls
5253 * to this callback and the previously registered callback.
5254 * The callback will be used to create more than one mutex
5255 * each of which must be backed by its own underlying locking
5256 * mechanism (i.e. do not use a single static object to
5257 * implement your lock manager). If cb is set to NULL the
5258 * lockmgr will be unregistered.
5260 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5263 * Get the type of the given codec.
5265 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5268 * Get the name of a codec.
5269 * @return a static string identifying the codec; never NULL
5271 const char *avcodec_get_name(enum AVCodecID id);
5274 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5275 * with no corresponding avcodec_close()), 0 otherwise.
5277 int avcodec_is_open(AVCodecContext *s);
5280 * @return a non-zero number if codec is an encoder, zero otherwise
5282 int av_codec_is_encoder(const AVCodec *codec);
5285 * @return a non-zero number if codec is a decoder, zero otherwise
5287 int av_codec_is_decoder(const AVCodec *codec);
5290 * @return descriptor for given codec ID or NULL if no descriptor exists.
5292 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5295 * Iterate over all codec descriptors known to libavcodec.
5297 * @param prev previous descriptor. NULL to get the first descriptor.
5299 * @return next descriptor or NULL after the last descriptor
5301 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5304 * @return codec descriptor with the given name or NULL if no such descriptor
5307 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5313 #endif /* AVCODEC_AVCODEC_H */