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
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
37 #include "libavutil/audioconvert.h"
39 #include "libavcodec/version.h"
41 * @defgroup libavc Encoding/Decoding Library
44 * @defgroup lavc_decoding Decoding
48 * @defgroup lavc_encoding Encoding
52 * @defgroup lavc_codec Codecs
54 * @defgroup lavc_codec_native Native Codecs
57 * @defgroup lavc_codec_wrappers External library wrappers
60 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
64 * @defgroup lavc_internal Internal
72 * @defgroup lavc_core Core functions/structures.
75 * Basic definitions, functions for querying libavcodec capabilities,
76 * allocating core structures, etc.
82 * Identify the syntax and semantics of the bitstream.
83 * The principle is roughly:
84 * Two decoders with the same ID can decode the same streams.
85 * Two encoders with the same ID can encode compatible streams.
86 * There may be slight deviations from the principle due to implementation
89 * If you add a codec ID to this list, add it so that
90 * 1. no value of a existing codec ID changes (that would break ABI),
91 * 2. Give it a value which when taken as ASCII is recognized uniquely by a human as this specific codec.
92 * This ensures that 2 forks can independently add AVCodecIDs without producing conflicts.
94 * After adding new codec IDs, do not forget to add an entry to the codec
95 * descriptor list and bump libavcodec minor version.
101 AV_CODEC_ID_MPEG1VIDEO,
102 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
103 AV_CODEC_ID_MPEG2VIDEO_XVMC,
114 AV_CODEC_ID_RAWVIDEO,
115 AV_CODEC_ID_MSMPEG4V1,
116 AV_CODEC_ID_MSMPEG4V2,
117 AV_CODEC_ID_MSMPEG4V3,
140 AV_CODEC_ID_INTERPLAY_VIDEO,
147 AV_CODEC_ID_MSVIDEO1,
152 AV_CODEC_ID_TRUEMOTION1,
153 AV_CODEC_ID_VMDVIDEO,
179 AV_CODEC_ID_TRUEMOTION2,
185 AV_CODEC_ID_SMACKVIDEO,
190 AV_CODEC_ID_JPEG2000,
196 AV_CODEC_ID_DSICINVIDEO,
197 AV_CODEC_ID_TIERTEXSEQVIDEO,
205 AV_CODEC_ID_BETHSOFTVID,
217 AV_CODEC_ID_ESCAPE124,
221 AV_CODEC_ID_MOTIONPIXELS,
233 AV_CODEC_ID_FLASHSV2,
234 AV_CODEC_ID_CDGRAPHICS,
237 AV_CODEC_ID_BINKVIDEO,
238 AV_CODEC_ID_IFF_ILBM,
239 AV_CODEC_ID_IFF_BYTERUN1,
245 AV_CODEC_ID_A64_MULTI,
246 AV_CODEC_ID_A64_MULTI5,
249 AV_CODEC_ID_LAGARITH,
253 AV_CODEC_ID_WMV3IMAGE,
254 AV_CODEC_ID_VC1IMAGE,
256 AV_CODEC_ID_BMV_VIDEO,
263 AV_CODEC_ID_ZEROCODEC,
270 AV_CODEC_ID_Y41P = MKBETAG('Y','4','1','P'),
271 AV_CODEC_ID_ESCAPE130 = MKBETAG('E','1','3','0'),
272 AV_CODEC_ID_EXR = MKBETAG('0','E','X','R'),
273 AV_CODEC_ID_AVRP = MKBETAG('A','V','R','P'),
275 AV_CODEC_ID_G2M = MKBETAG( 0 ,'G','2','M'),
276 AV_CODEC_ID_AVUI = MKBETAG('A','V','U','I'),
277 AV_CODEC_ID_AYUV = MKBETAG('A','Y','U','V'),
278 AV_CODEC_ID_V308 = MKBETAG('V','3','0','8'),
279 AV_CODEC_ID_V408 = MKBETAG('V','4','0','8'),
280 AV_CODEC_ID_YUV4 = MKBETAG('Y','U','V','4'),
281 AV_CODEC_ID_SANM = MKBETAG('S','A','N','M'),
282 AV_CODEC_ID_PAF_VIDEO = MKBETAG('P','A','F','V'),
283 AV_CODEC_ID_AVRN = MKBETAG('A','V','R','n'),
284 AV_CODEC_ID_CPIA = MKBETAG('C','P','I','A'),
286 /* various PCM "codecs" */
287 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
288 AV_CODEC_ID_PCM_S16LE = 0x10000,
289 AV_CODEC_ID_PCM_S16BE,
290 AV_CODEC_ID_PCM_U16LE,
291 AV_CODEC_ID_PCM_U16BE,
294 AV_CODEC_ID_PCM_MULAW,
295 AV_CODEC_ID_PCM_ALAW,
296 AV_CODEC_ID_PCM_S32LE,
297 AV_CODEC_ID_PCM_S32BE,
298 AV_CODEC_ID_PCM_U32LE,
299 AV_CODEC_ID_PCM_U32BE,
300 AV_CODEC_ID_PCM_S24LE,
301 AV_CODEC_ID_PCM_S24BE,
302 AV_CODEC_ID_PCM_U24LE,
303 AV_CODEC_ID_PCM_U24BE,
304 AV_CODEC_ID_PCM_S24DAUD,
305 AV_CODEC_ID_PCM_ZORK,
306 AV_CODEC_ID_PCM_S16LE_PLANAR,
308 AV_CODEC_ID_PCM_F32BE,
309 AV_CODEC_ID_PCM_F32LE,
310 AV_CODEC_ID_PCM_F64BE,
311 AV_CODEC_ID_PCM_F64LE,
312 AV_CODEC_ID_PCM_BLURAY,
315 AV_CODEC_ID_PCM_S8_PLANAR,
317 /* various ADPCM codecs */
318 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
319 AV_CODEC_ID_ADPCM_IMA_WAV,
320 AV_CODEC_ID_ADPCM_IMA_DK3,
321 AV_CODEC_ID_ADPCM_IMA_DK4,
322 AV_CODEC_ID_ADPCM_IMA_WS,
323 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
324 AV_CODEC_ID_ADPCM_MS,
325 AV_CODEC_ID_ADPCM_4XM,
326 AV_CODEC_ID_ADPCM_XA,
327 AV_CODEC_ID_ADPCM_ADX,
328 AV_CODEC_ID_ADPCM_EA,
329 AV_CODEC_ID_ADPCM_G726,
330 AV_CODEC_ID_ADPCM_CT,
331 AV_CODEC_ID_ADPCM_SWF,
332 AV_CODEC_ID_ADPCM_YAMAHA,
333 AV_CODEC_ID_ADPCM_SBPRO_4,
334 AV_CODEC_ID_ADPCM_SBPRO_3,
335 AV_CODEC_ID_ADPCM_SBPRO_2,
336 AV_CODEC_ID_ADPCM_THP,
337 AV_CODEC_ID_ADPCM_IMA_AMV,
338 AV_CODEC_ID_ADPCM_EA_R1,
339 AV_CODEC_ID_ADPCM_EA_R3,
340 AV_CODEC_ID_ADPCM_EA_R2,
341 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
342 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
343 AV_CODEC_ID_ADPCM_EA_XAS,
344 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
345 AV_CODEC_ID_ADPCM_IMA_ISS,
346 AV_CODEC_ID_ADPCM_G722,
347 AV_CODEC_ID_ADPCM_IMA_APC,
348 AV_CODEC_ID_VIMA = MKBETAG('V','I','M','A'),
351 AV_CODEC_ID_AMR_NB = 0x12000,
354 /* RealAudio codecs*/
355 AV_CODEC_ID_RA_144 = 0x13000,
358 /* various DPCM codecs */
359 AV_CODEC_ID_ROQ_DPCM = 0x14000,
360 AV_CODEC_ID_INTERPLAY_DPCM,
361 AV_CODEC_ID_XAN_DPCM,
362 AV_CODEC_ID_SOL_DPCM,
365 AV_CODEC_ID_MP2 = 0x15000,
366 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
376 AV_CODEC_ID_VMDAUDIO,
382 AV_CODEC_ID_WESTWOOD_SND1,
383 AV_CODEC_ID_GSM, ///< as in Berlin toast format
386 AV_CODEC_ID_TRUESPEECH,
388 AV_CODEC_ID_SMACKAUDIO,
391 AV_CODEC_ID_DSICINAUDIO,
393 AV_CODEC_ID_MUSEPACK7,
395 AV_CODEC_ID_GSM_MS, /* as found in WAV */
399 AV_CODEC_ID_NELLYMOSER,
400 AV_CODEC_ID_MUSEPACK8,
402 AV_CODEC_ID_WMAVOICE,
404 AV_CODEC_ID_WMALOSSLESS,
413 AV_CODEC_ID_BINKAUDIO_RDFT,
414 AV_CODEC_ID_BINKAUDIO_DCT,
415 AV_CODEC_ID_AAC_LATM,
420 AV_CODEC_ID_8SVX_EXP,
421 AV_CODEC_ID_8SVX_FIB,
422 AV_CODEC_ID_BMV_AUDIO,
426 AV_CODEC_ID_FFWAVESYNTH = MKBETAG('F','F','W','S'),
427 AV_CODEC_ID_8SVX_RAW = MKBETAG('8','S','V','X'),
428 AV_CODEC_ID_SONIC = MKBETAG('S','O','N','C'),
429 AV_CODEC_ID_SONIC_LS = MKBETAG('S','O','N','L'),
430 AV_CODEC_ID_PAF_AUDIO = MKBETAG('P','A','F','A'),
431 AV_CODEC_ID_OPUS = MKBETAG('O','P','U','S'),
433 /* subtitle codecs */
434 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
435 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
436 AV_CODEC_ID_DVB_SUBTITLE,
437 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
440 AV_CODEC_ID_MOV_TEXT,
441 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
442 AV_CODEC_ID_DVB_TELETEXT,
444 AV_CODEC_ID_MICRODVD = MKBETAG('m','D','V','D'),
445 AV_CODEC_ID_EIA_608 = MKBETAG('c','6','0','8'),
446 AV_CODEC_ID_JACOSUB = MKBETAG('J','S','U','B'),
447 AV_CODEC_ID_SAMI = MKBETAG('S','A','M','I'),
448 AV_CODEC_ID_REALTEXT = MKBETAG('R','T','X','T'),
449 AV_CODEC_ID_SUBVIEWER = MKBETAG('S','u','b','V'),
450 AV_CODEC_ID_SUBRIP = MKBETAG('S','R','i','p'),
452 /* other specific kind of codecs (generally used for attachments) */
453 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
454 AV_CODEC_ID_TTF = 0x18000,
455 AV_CODEC_ID_BINTEXT = MKBETAG('B','T','X','T'),
456 AV_CODEC_ID_XBIN = MKBETAG('X','B','I','N'),
457 AV_CODEC_ID_IDF = MKBETAG( 0 ,'I','D','F'),
458 AV_CODEC_ID_OTF = MKBETAG( 0 ,'O','T','F'),
460 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
462 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
463 * stream (only used by libavformat) */
464 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
465 * stream (only used by libavformat) */
466 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
469 #include "old_codec_ids.h"
474 #define CodecID AVCodecID
478 * This struct describes the properties of a single codec described by an
480 * @see avcodec_get_descriptor()
482 typedef struct AVCodecDescriptor {
484 enum AVMediaType type;
486 * Name of the codec described by this descriptor. It is non-empty and
487 * unique for each codec descriptor. It should contain alphanumeric
488 * characters and '_' only.
492 * A more descriptive name for this codec. May be NULL.
494 const char *long_name;
496 * Codec properties, a combination of AV_CODEC_PROP_* flags.
502 * Codec uses only intra compression.
505 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
507 * Codec supports lossy compression. Audio and video codecs only.
508 * @note a codec may support both lossy and lossless
511 #define AV_CODEC_PROP_LOSSY (1 << 1)
513 * Codec supports lossless compression. Audio and video codecs only.
515 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
517 #if FF_API_OLD_DECODE_AUDIO
519 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
523 * @ingroup lavc_decoding
524 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
525 * This is mainly needed because some optimized bitstream readers read
526 * 32 or 64 bit at once and could read over the end.<br>
527 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
528 * MPEG bitstreams could cause overread and segfault.
530 #define FF_INPUT_BUFFER_PADDING_SIZE 16
533 * @ingroup lavc_encoding
534 * minimum encoding buffer size
535 * Used to avoid some checks during header writing.
537 #define FF_MIN_BUFFER_SIZE 16384
541 * @ingroup lavc_encoding
542 * motion estimation type.
545 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
549 ME_EPZS, ///< enhanced predictive zonal search
550 ME_X1, ///< reserved for experiments
551 ME_HEX, ///< hexagon based search
552 ME_UMH, ///< uneven multi-hexagon search
553 ME_ITER, ///< iterative search
554 ME_TESA, ///< transformed exhaustive search algorithm
558 * @ingroup lavc_decoding
561 /* We leave some space between them for extensions (drop some
562 * keyframes for intra-only or drop just some bidir frames). */
563 AVDISCARD_NONE =-16, ///< discard nothing
564 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
565 AVDISCARD_NONREF = 8, ///< discard all non reference
566 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
567 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
568 AVDISCARD_ALL = 48, ///< discard all
571 enum AVColorPrimaries{
572 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
573 AVCOL_PRI_UNSPECIFIED = 2,
574 AVCOL_PRI_BT470M = 4,
575 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
576 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
577 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
579 AVCOL_PRI_NB , ///< Not part of ABI
582 enum AVColorTransferCharacteristic{
583 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
584 AVCOL_TRC_UNSPECIFIED = 2,
585 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
586 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
587 AVCOL_TRC_SMPTE240M = 7,
588 AVCOL_TRC_NB , ///< Not part of ABI
593 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
594 AVCOL_SPC_UNSPECIFIED = 2,
596 AVCOL_SPC_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
597 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
598 AVCOL_SPC_SMPTE240M = 7,
599 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
600 AVCOL_SPC_NB , ///< Not part of ABI
602 #define AVCOL_SPC_YCGCO AVCOL_SPC_YCOCG
605 AVCOL_RANGE_UNSPECIFIED = 0,
606 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
607 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
608 AVCOL_RANGE_NB , ///< Not part of ABI
612 * X X 3 4 X X are luma samples,
613 * 1 2 1-6 are possible chroma positions
614 * X X 5 6 X 0 is undefined/unknown position
616 enum AVChromaLocation{
617 AVCHROMA_LOC_UNSPECIFIED = 0,
618 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
619 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
620 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
621 AVCHROMA_LOC_TOP = 4,
622 AVCHROMA_LOC_BOTTOMLEFT = 5,
623 AVCHROMA_LOC_BOTTOM = 6,
624 AVCHROMA_LOC_NB , ///< Not part of ABI
627 enum AVAudioServiceType {
628 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
629 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
630 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
631 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
632 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
633 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
634 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
635 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
636 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
637 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
641 * @ingroup lavc_encoding
643 typedef struct RcOverride{
646 int qscale; // If this is 0 then quality_factor will be used instead.
647 float quality_factor;
650 #define FF_MAX_B_FRAMES 16
653 These flags can be passed in AVCodecContext.flags before initialization.
654 Note: Not everything is supported yet.
657 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
658 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
659 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
660 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
661 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
663 * The parent program guarantees that the input for B-frames containing
664 * streams is not written to for at least s->max_b_frames+1 frames, if
665 * this is not set the input will be copied.
667 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
668 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
669 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
670 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
671 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
672 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
673 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
674 location instead of only at frame boundaries. */
675 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
676 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
677 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
678 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
679 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
680 /* Fx : Flag for h263+ extra options */
681 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
682 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
683 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
684 #define CODEC_FLAG_CLOSED_GOP 0x80000000
685 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
686 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
687 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
688 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format. DEPRECATED!!!!
689 #if FF_API_MPV_GLOBAL_OPTS
690 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
691 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
692 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
693 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
695 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
696 #define CODEC_FLAG2_SHOW_ALL 0x00400000 ///< Show all frames before the first keyframe
698 /* Unsupported options :
699 * Syntax Arithmetic coding (SAC)
700 * Reference Picture Selection
701 * Independent Segment Decoding */
703 /* codec capabilities */
705 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
707 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
708 * If not set, it might not use get_buffer() at all or use operations that
709 * assume the buffer was allocated by avcodec_default_get_buffer.
711 #define CODEC_CAP_DR1 0x0002
712 #define CODEC_CAP_TRUNCATED 0x0008
713 /* Codec can export data for HW decoding (XvMC). */
714 #define CODEC_CAP_HWACCEL 0x0010
716 * Encoder or decoder requires flushing with NULL input at the end in order to
717 * give the complete and correct output.
719 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
720 * with NULL data. The user can still send NULL data to the public encode
721 * or decode function, but libavcodec will not pass it along to the codec
722 * unless this flag is set.
725 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
726 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
730 * The encoder needs to be fed with NULL data at the end of encoding until the
731 * encoder no longer returns data.
733 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
734 * flag also means that the encoder must set the pts and duration for
735 * each output packet. If this flag is not set, the pts and duration will
736 * be determined by libavcodec from the input frame.
738 #define CODEC_CAP_DELAY 0x0020
740 * Codec can be fed a final frame with a smaller size.
741 * This can be used to prevent truncation of the last audio samples.
743 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
745 * Codec can export data for HW decoding (VDPAU).
747 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
749 * Codec can output multiple frames per AVPacket
750 * Normally demuxers return one frame at a time, demuxers which do not do
751 * are connected to a parser to split what they return into proper frames.
752 * This flag is reserved to the very rare category of codecs which have a
753 * bitstream that cannot be split into frames without timeconsuming
754 * operations like full decoding. Demuxers carring such bitstreams thus
755 * may return multiple frames in a packet. This has many disadvantages like
756 * prohibiting stream copy in many cases thus it should only be considered
759 #define CODEC_CAP_SUBFRAMES 0x0100
761 * Codec is experimental and is thus avoided in favor of non experimental
764 #define CODEC_CAP_EXPERIMENTAL 0x0200
766 * Codec should fill in channel configuration and samplerate instead of container
768 #define CODEC_CAP_CHANNEL_CONF 0x0400
771 * Codec is able to deal with negative linesizes
773 #define CODEC_CAP_NEG_LINESIZES 0x0800
776 * Codec supports frame-level multithreading.
778 #define CODEC_CAP_FRAME_THREADS 0x1000
780 * Codec supports slice-based (or partition-based) multithreading.
782 #define CODEC_CAP_SLICE_THREADS 0x2000
784 * Codec supports changed parameters at any point.
786 #define CODEC_CAP_PARAM_CHANGE 0x4000
788 * Codec supports avctx->thread_count == 0 (auto).
790 #define CODEC_CAP_AUTO_THREADS 0x8000
792 * Audio encoder supports receiving a different number of samples in each call.
794 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
796 * Codec is intra only.
798 #define CODEC_CAP_INTRA_ONLY 0x40000000
802 #define CODEC_CAP_LOSSLESS 0x80000000
804 //The following defines may change, don't expect compatibility if you use them.
805 #define MB_TYPE_INTRA4x4 0x0001
806 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
807 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
808 #define MB_TYPE_16x16 0x0008
809 #define MB_TYPE_16x8 0x0010
810 #define MB_TYPE_8x16 0x0020
811 #define MB_TYPE_8x8 0x0040
812 #define MB_TYPE_INTERLACED 0x0080
813 #define MB_TYPE_DIRECT2 0x0100 //FIXME
814 #define MB_TYPE_ACPRED 0x0200
815 #define MB_TYPE_GMC 0x0400
816 #define MB_TYPE_SKIP 0x0800
817 #define MB_TYPE_P0L0 0x1000
818 #define MB_TYPE_P1L0 0x2000
819 #define MB_TYPE_P0L1 0x4000
820 #define MB_TYPE_P1L1 0x8000
821 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
822 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
823 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
824 #define MB_TYPE_QUANT 0x00010000
825 #define MB_TYPE_CBP 0x00020000
826 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
830 * This specifies the area which should be displayed.
831 * Note there may be multiple such areas for one frame.
833 typedef struct AVPanScan{
836 * - encoding: Set by user.
837 * - decoding: Set by libavcodec.
842 * width and height in 1/16 pel
843 * - encoding: Set by user.
844 * - decoding: Set by libavcodec.
850 * position of the top left corner in 1/16 pel for up to 3 fields/frames
851 * - encoding: Set by user.
852 * - decoding: Set by libavcodec.
854 int16_t position[3][2];
857 #define FF_QSCALE_TYPE_MPEG1 0
858 #define FF_QSCALE_TYPE_MPEG2 1
859 #define FF_QSCALE_TYPE_H264 2
860 #define FF_QSCALE_TYPE_VP56 3
862 #define FF_BUFFER_TYPE_INTERNAL 1
863 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
864 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
865 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
867 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
868 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
869 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
870 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
873 * @defgroup lavc_packet AVPacket
875 * Types and functions for working with AVPacket.
878 enum AVPacketSideDataType {
880 AV_PKT_DATA_NEW_EXTRADATA,
883 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
886 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
887 * s32le channel_count
888 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
889 * u64le channel_layout
890 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
892 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
897 AV_PKT_DATA_PARAM_CHANGE,
900 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
901 * structures with info about macroblocks relevant to splitting the
902 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
903 * That is, it does not necessarily contain info about all macroblocks,
904 * as long as the distance between macroblocks in the info is smaller
905 * than the target payload size.
906 * Each MB info structure is 12 bytes, and is laid out as follows:
908 * u32le bit offset from the start of the packet
909 * u8 current quantizer at the start of the macroblock
911 * u16le macroblock address within the GOB
912 * u8 horizontal MV predictor
913 * u8 vertical MV predictor
914 * u8 horizontal MV predictor for block number 3
915 * u8 vertical MV predictor for block number 3
918 AV_PKT_DATA_H263_MB_INFO,
921 * Recommmends skipping the specified number of samples
923 * u32le number of samples to skip from start of this packet
924 * u32le number of samples to skip from end of this packet
925 * u8 reason for start skip
926 * u8 reason for end skip (0=padding silence, 1=convergence)
929 AV_PKT_DATA_SKIP_SAMPLES=70,
932 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
933 * the packet may contain "dual mono" audio specific to Japanese DTV
934 * and if it is true, recommends only the selected channel to be used.
936 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
939 AV_PKT_DATA_JP_DUALMONO,
942 typedef struct AVPacket {
944 * Presentation timestamp in AVStream->time_base units; the time at which
945 * the decompressed packet will be presented to the user.
946 * Can be AV_NOPTS_VALUE if it is not stored in the file.
947 * pts MUST be larger or equal to dts as presentation cannot happen before
948 * decompression, unless one wants to view hex dumps. Some formats misuse
949 * the terms dts and pts/cts to mean something different. Such timestamps
950 * must be converted to true pts/dts before they are stored in AVPacket.
954 * Decompression timestamp in AVStream->time_base units; the time at which
955 * the packet is decompressed.
956 * Can be AV_NOPTS_VALUE if it is not stored in the file.
963 * A combination of AV_PKT_FLAG values
967 * Additional packet data that can be provided by the container.
968 * Packet can contain several types of side information.
973 enum AVPacketSideDataType type;
978 * Duration of this packet in AVStream->time_base units, 0 if unknown.
979 * Equals next_pts - this_pts in presentation order.
982 void (*destruct)(struct AVPacket *);
984 int64_t pos; ///< byte position in stream, -1 if unknown
987 * Time difference in AVStream->time_base units from the pts of this
988 * packet to the point at which the output from the decoder has converged
989 * independent from the availability of previous frames. That is, the
990 * frames are virtually identical no matter if decoding started from
991 * the very first frame or from this keyframe.
992 * Is AV_NOPTS_VALUE if unknown.
993 * This field is not the display duration of the current packet.
994 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
997 * The purpose of this field is to allow seeking in streams that have no
998 * keyframes in the conventional sense. It corresponds to the
999 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1000 * essential for some types of subtitle streams to ensure that all
1001 * subtitles are correctly displayed after seeking.
1003 int64_t convergence_duration;
1005 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1006 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1008 enum AVSideDataParamChangeFlags {
1009 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1010 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1011 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1012 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1019 * Audio Video Frame.
1020 * New fields can be added to the end of AVFRAME with minor version
1021 * bumps. Similarly fields that are marked as to be only accessed by
1022 * av_opt_ptr() can be reordered. This allows 2 forks to add fields
1023 * without breaking compatibility with each other.
1024 * Removal, reordering and changes in the remaining cases require
1025 * a major version bump.
1026 * sizeof(AVFrame) must not be used outside libavcodec.
1028 typedef struct AVFrame {
1029 #define AV_NUM_DATA_POINTERS 8
1031 * pointer to the picture/channel planes.
1032 * This might be different from the first allocated byte
1033 * - encoding: Set by user
1034 * - decoding: set by AVCodecContext.get_buffer()
1036 uint8_t *data[AV_NUM_DATA_POINTERS];
1039 * Size, in bytes, of the data for each picture/channel plane.
1041 * For audio, only linesize[0] may be set. For planar audio, each channel
1042 * plane must be the same size.
1044 * - encoding: Set by user
1045 * - decoding: set by AVCodecContext.get_buffer()
1047 int linesize[AV_NUM_DATA_POINTERS];
1050 * pointers to the data planes/channels.
1052 * For video, this should simply point to data[].
1054 * For planar audio, each channel has a separate data pointer, and
1055 * linesize[0] contains the size of each channel buffer.
1056 * For packed audio, there is just one data pointer, and linesize[0]
1057 * contains the total size of the buffer for all channels.
1059 * Note: Both data and extended_data will always be set by get_buffer(),
1060 * but for planar audio with more channels that can fit in data,
1061 * extended_data must be used by the decoder in order to access all
1065 * decoding: set by AVCodecContext.get_buffer()
1067 uint8_t **extended_data;
1070 * width and height of the video frame
1071 * - encoding: unused
1072 * - decoding: Read by user.
1077 * number of audio samples (per channel) described by this frame
1078 * - encoding: Set by user
1079 * - decoding: Set by libavcodec
1084 * format of the frame, -1 if unknown or unset
1085 * Values correspond to enum PixelFormat for video frames,
1086 * enum AVSampleFormat for audio)
1087 * - encoding: unused
1088 * - decoding: Read by user.
1093 * 1 -> keyframe, 0-> not
1094 * - encoding: Set by libavcodec.
1095 * - decoding: Set by libavcodec.
1100 * Picture type of the frame, see ?_TYPE below.
1101 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1102 * - decoding: Set by libavcodec.
1104 enum AVPictureType pict_type;
1107 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
1108 * This isn't used by libavcodec unless the default get/release_buffer() is used.
1112 uint8_t *base[AV_NUM_DATA_POINTERS];
1115 * sample aspect ratio for the video frame, 0/1 if unknown/unspecified
1116 * - encoding: unused
1117 * - decoding: Read by user.
1119 AVRational sample_aspect_ratio;
1122 * presentation timestamp in time_base units (time when frame should be shown to user)
1123 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1124 * - encoding: MUST be set by user.
1125 * - decoding: Set by libavcodec.
1130 * reordered pts from the last AVPacket that has been input into the decoder
1131 * - encoding: unused
1132 * - decoding: Read by user.
1137 * dts from the last AVPacket that has been input into the decoder
1138 * - encoding: unused
1139 * - decoding: Read by user.
1144 * picture number in bitstream order
1145 * - encoding: set by
1146 * - decoding: Set by libavcodec.
1148 int coded_picture_number;
1150 * picture number in display order
1151 * - encoding: set by
1152 * - decoding: Set by libavcodec.
1154 int display_picture_number;
1157 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1158 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1159 * - decoding: Set by libavcodec.
1164 * is this picture used as reference
1165 * The values for this are the same as the MpegEncContext.picture_structure
1166 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1167 * Set to 4 for delayed, non-reference frames.
1168 * - encoding: unused
1169 * - decoding: Set by libavcodec. (before get_buffer() call)).
1175 * - encoding: unused
1176 * - decoding: Set by libavcodec.
1178 int8_t *qscale_table;
1181 * - encoding: unused
1182 * - decoding: Set by libavcodec.
1192 * mbskip_table[mb]>=1 if MB didn't change
1193 * stride= mb_width = (width+15)>>4
1194 * - encoding: unused
1195 * - decoding: Set by libavcodec.
1197 uint8_t *mbskip_table;
1200 * motion vector table
1203 * int mv_sample_log2= 4 - motion_subsample_log2;
1204 * int mb_width= (width+15)>>4;
1205 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1206 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1208 * - encoding: Set by user.
1209 * - decoding: Set by libavcodec.
1211 int16_t (*motion_val[2])[2];
1214 * macroblock type table
1215 * mb_type_base + mb_width + 2
1216 * - encoding: Set by user.
1217 * - decoding: Set by libavcodec.
1223 * - encoding: unused
1224 * - decoding: Set by libavcodec.
1229 * motion reference frame index
1230 * the order in which these are stored can depend on the codec.
1231 * - encoding: Set by user.
1232 * - decoding: Set by libavcodec.
1234 int8_t *ref_index[2];
1237 * for some private data of the user
1238 * - encoding: unused
1239 * - decoding: Set by user.
1245 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1246 * - decoding: unused
1248 uint64_t error[AV_NUM_DATA_POINTERS];
1251 * type of the buffer (to keep track of who has to deallocate data[*])
1252 * - encoding: Set by the one who allocates it.
1253 * - decoding: Set by the one who allocates it.
1254 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1259 * When decoding, this signals how much the picture must be delayed.
1260 * extra_delay = repeat_pict / (2*fps)
1261 * - encoding: unused
1262 * - decoding: Set by libavcodec.
1267 * The content of the picture is interlaced.
1268 * - encoding: Set by user.
1269 * - decoding: Set by libavcodec. (default 0)
1271 int interlaced_frame;
1274 * If the content is interlaced, is top field displayed first.
1275 * - encoding: Set by user.
1276 * - decoding: Set by libavcodec.
1278 int top_field_first;
1281 * Tell user application that palette has changed from previous frame.
1282 * - encoding: ??? (no palette-enabled encoder yet)
1283 * - decoding: Set by libavcodec. (default 0).
1285 int palette_has_changed;
1288 * codec suggestion on buffer type if != 0
1289 * - encoding: unused
1290 * - decoding: Set by libavcodec. (before get_buffer() call)).
1296 * - encoding: Set by user.
1297 * - decoding: Set by libavcodec.
1299 AVPanScan *pan_scan;
1302 * reordered opaque 64bit (generally an integer or a double precision float
1303 * PTS but can be anything).
1304 * The user sets AVCodecContext.reordered_opaque to represent the input at
1306 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1307 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1308 * @deprecated in favor of pkt_pts
1309 * - encoding: unused
1310 * - decoding: Read by user.
1312 int64_t reordered_opaque;
1315 * hardware accelerator private data (FFmpeg-allocated)
1316 * - encoding: unused
1317 * - decoding: Set by libavcodec
1319 void *hwaccel_picture_private;
1322 * the AVCodecContext which ff_thread_get_buffer() was last called on
1323 * - encoding: Set by libavcodec.
1324 * - decoding: Set by libavcodec.
1326 struct AVCodecContext *owner;
1329 * used by multithreading to store frame-specific info
1330 * - encoding: Set by libavcodec.
1331 * - decoding: Set by libavcodec.
1333 void *thread_opaque;
1336 * log2 of the size of the block which a single vector in motion_val represents:
1337 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1338 * - encoding: unused
1339 * - decoding: Set by libavcodec.
1341 uint8_t motion_subsample_log2;
1344 * Sample rate of the audio data.
1346 * - encoding: unused
1347 * - decoding: read by user
1352 * Channel layout of the audio data.
1354 * - encoding: unused
1355 * - decoding: read by user.
1357 uint64_t channel_layout;
1360 * frame timestamp estimated using various heuristics, in stream time base
1361 * Code outside libavcodec should access this field using:
1362 * av_frame_get_best_effort_timestamp(frame)
1363 * - encoding: unused
1364 * - decoding: set by libavcodec, read by user.
1366 int64_t best_effort_timestamp;
1369 * reordered pos from the last AVPacket that has been input into the decoder
1370 * Code outside libavcodec should access this field using:
1371 * av_frame_get_pkt_pos(frame)
1372 * - encoding: unused
1373 * - decoding: Read by user.
1378 * duration of the corresponding packet, expressed in
1379 * AVStream->time_base units, 0 if unknown.
1380 * Code outside libavcodec should access this field using:
1381 * av_frame_get_pkt_duration(frame)
1382 * - encoding: unused
1383 * - decoding: Read by user.
1385 int64_t pkt_duration;
1389 * Code outside libavcodec should access this field using:
1390 * av_frame_get_metadata(frame)
1391 * - encoding: Set by user.
1392 * - decoding: Set by libavcodec.
1394 AVDictionary *metadata;
1397 * decode error flags of the frame, set to a combination of
1398 * FF_DECODE_ERROR_xxx flags if the decoder produced a frame, but there
1399 * were errors during the decoding.
1400 * Code outside libavcodec should access this field using:
1401 * av_frame_get_decode_error_flags(frame)
1402 * - encoding: unused
1403 * - decoding: set by libavcodec, read by user.
1405 int decode_error_flags;
1406 #define FF_DECODE_ERROR_INVALID_BITSTREAM 1
1407 #define FF_DECODE_ERROR_MISSING_REFERENCE 2
1410 * number of audio channels, only used for audio.
1411 * Code outside libavcodec should access this field using:
1412 * av_frame_get_channels(frame)
1413 * - encoding: unused
1414 * - decoding: Read by user.
1420 * Accessors for some AVFrame fields.
1421 * The position of these field in the structure is not part of the ABI,
1422 * they should not be accessed directly outside libavcodec.
1424 int64_t av_frame_get_best_effort_timestamp(const AVFrame *frame);
1425 void av_frame_set_best_effort_timestamp(AVFrame *frame, int64_t val);
1426 int64_t av_frame_get_pkt_duration (const AVFrame *frame);
1427 void av_frame_set_pkt_duration (AVFrame *frame, int64_t val);
1428 int64_t av_frame_get_pkt_pos (const AVFrame *frame);
1429 void av_frame_set_pkt_pos (AVFrame *frame, int64_t val);
1430 int64_t av_frame_get_channel_layout (const AVFrame *frame);
1431 void av_frame_set_channel_layout (AVFrame *frame, int64_t val);
1432 int av_frame_get_channels (const AVFrame *frame);
1433 void av_frame_set_channels (AVFrame *frame, int val);
1434 int av_frame_get_sample_rate (const AVFrame *frame);
1435 void av_frame_set_sample_rate (AVFrame *frame, int val);
1436 AVDictionary *av_frame_get_metadata (const AVFrame *frame);
1437 void av_frame_set_metadata (AVFrame *frame, AVDictionary *val);
1438 int av_frame_get_decode_error_flags (const AVFrame *frame);
1439 void av_frame_set_decode_error_flags (AVFrame *frame, int val);
1441 struct AVCodecInternal;
1445 AV_FIELD_PROGRESSIVE,
1446 AV_FIELD_TT, //< Top coded_first, top displayed first
1447 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1448 AV_FIELD_TB, //< Top coded first, bottom displayed first
1449 AV_FIELD_BT, //< Bottom coded first, top displayed first
1453 * main external API structure.
1454 * New fields can be added to the end with minor version bumps.
1455 * Removal, reordering and changes to existing fields require a major
1457 * Please use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1459 * sizeof(AVCodecContext) must not be used outside libav*.
1461 typedef struct AVCodecContext {
1463 * information on struct for av_log
1464 * - set by avcodec_alloc_context3
1466 const AVClass *av_class;
1467 int log_level_offset;
1469 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1470 const struct AVCodec *codec;
1471 char codec_name[32];
1472 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1475 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1476 * This is used to work around some encoder bugs.
1477 * A demuxer should set this to what is stored in the field used to identify the codec.
1478 * If there are multiple such fields in a container then the demuxer should choose the one
1479 * which maximizes the information about the used codec.
1480 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1481 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1482 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1484 * - encoding: Set by user, if not then the default based on codec_id will be used.
1485 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1487 unsigned int codec_tag;
1490 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1491 * This is used to work around some encoder bugs.
1492 * - encoding: unused
1493 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1495 unsigned int stream_codec_tag;
1499 * @deprecated this field is unused
1501 attribute_deprecated int sub_id;
1507 * Private context used for internal data.
1509 * Unlike priv_data, this is not codec-specific. It is used in general
1510 * libavcodec functions.
1512 struct AVCodecInternal *internal;
1515 * Private data of the user, can be used to carry app specific stuff.
1516 * - encoding: Set by user.
1517 * - decoding: Set by user.
1522 * the average bitrate
1523 * - encoding: Set by user; unused for constant quantizer encoding.
1524 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1529 * number of bits the bitstream is allowed to diverge from the reference.
1530 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1531 * - encoding: Set by user; unused for constant quantizer encoding.
1532 * - decoding: unused
1534 int bit_rate_tolerance;
1537 * Global quality for codecs which cannot change it per frame.
1538 * This should be proportional to MPEG-1/2/4 qscale.
1539 * - encoding: Set by user.
1540 * - decoding: unused
1545 * - encoding: Set by user.
1546 * - decoding: unused
1548 int compression_level;
1549 #define FF_COMPRESSION_DEFAULT -1
1553 * - encoding: Set by user.
1554 * - decoding: Set by user.
1560 * - encoding: Set by user.
1561 * - decoding: Set by user.
1566 * some codecs need / can use extradata like Huffman tables.
1567 * mjpeg: Huffman tables
1568 * rv10: additional flags
1569 * mpeg4: global headers (they can be in the bitstream or here)
1570 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1571 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1572 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1573 * - encoding: Set/allocated/freed by libavcodec.
1574 * - decoding: Set/allocated/freed by user.
1580 * This is the fundamental unit of time (in seconds) in terms
1581 * of which frame timestamps are represented. For fixed-fps content,
1582 * timebase should be 1/framerate and timestamp increments should be
1584 * - encoding: MUST be set by user.
1585 * - decoding: Set by libavcodec.
1587 AVRational time_base;
1590 * For some codecs, the time base is closer to the field rate than the frame rate.
1591 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1592 * if no telecine is used ...
1594 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1596 int ticks_per_frame;
1599 * Encoding: Number of frames delay there will be from the encoder input to
1600 * the decoder output. (we assume the decoder matches the spec)
1601 * Decoding: Number of frames delay in addition to what a standard decoder
1602 * as specified in the spec would produce.
1605 * Number of frames the decoded output will be delayed relative to the
1609 * Number of "priming" samples added to the beginning of the stream
1610 * during encoding. The decoded output will be delayed by this many
1611 * samples relative to the input to the encoder. Note that this field is
1612 * purely informational and does not directly affect the pts output by
1613 * the encoder, which should always be based on the actual presentation
1614 * time, including any delay.
1616 * - encoding: Set by libavcodec.
1617 * - decoding: Set by libavcodec.
1624 * picture width / height.
1625 * - encoding: MUST be set by user.
1626 * - decoding: Set by libavcodec.
1627 * Note: For compatibility it is possible to set this instead of
1628 * coded_width/height before decoding.
1633 * Bitstream width / height, may be different from width/height if lowres enabled.
1634 * - encoding: unused
1635 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1637 int coded_width, coded_height;
1639 #define FF_ASPECT_EXTENDED 15
1642 * the number of pictures in a group of pictures, or 0 for intra_only
1643 * - encoding: Set by user.
1644 * - decoding: unused
1649 * Pixel format, see PIX_FMT_xxx.
1650 * May be set by the demuxer if known from headers.
1651 * May be overridden by the decoder if it knows better.
1652 * - encoding: Set by user.
1653 * - decoding: Set by user if known, overridden by libavcodec if known
1655 enum PixelFormat pix_fmt;
1658 * Motion estimation algorithm used for video coding.
1659 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1660 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1661 * - encoding: MUST be set by user.
1662 * - decoding: unused
1667 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1668 * decoder to draw a horizontal band. It improves cache usage. Not
1669 * all codecs can do that. You must check the codec capabilities
1671 * When multithreading is used, it may be called from multiple threads
1672 * at the same time; threads might draw different parts of the same AVFrame,
1673 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1675 * The function is also used by hardware acceleration APIs.
1676 * It is called at least once during frame decoding to pass
1677 * the data needed for hardware render.
1678 * In that mode instead of pixel data, AVFrame points to
1679 * a structure specific to the acceleration API. The application
1680 * reads the structure and can change some fields to indicate progress
1682 * - encoding: unused
1683 * - decoding: Set by user.
1684 * @param height the height of the slice
1685 * @param y the y position of the slice
1686 * @param type 1->top field, 2->bottom field, 3->frame
1687 * @param offset offset into the AVFrame.data from which the slice should be read
1689 void (*draw_horiz_band)(struct AVCodecContext *s,
1690 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1691 int y, int type, int height);
1694 * callback to negotiate the pixelFormat
1695 * @param fmt is the list of formats which are supported by the codec,
1696 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1697 * The first is always the native one.
1698 * @return the chosen format
1699 * - encoding: unused
1700 * - decoding: Set by user, if not set the native format will be chosen.
1702 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1705 * maximum number of B-frames between non-B-frames
1706 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1707 * - encoding: Set by user.
1708 * - decoding: unused
1713 * qscale factor between IP and B-frames
1714 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1715 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1716 * - encoding: Set by user.
1717 * - decoding: unused
1719 float b_quant_factor;
1721 /** obsolete FIXME remove */
1723 #define FF_RC_STRATEGY_XVID 1
1725 int b_frame_strategy;
1727 #if FF_API_MPV_GLOBAL_OPTS
1729 * luma single coefficient elimination threshold
1730 * - encoding: Set by user.
1731 * - decoding: unused
1733 attribute_deprecated int luma_elim_threshold;
1736 * chroma single coeff elimination threshold
1737 * - encoding: Set by user.
1738 * - decoding: unused
1740 attribute_deprecated int chroma_elim_threshold;
1744 * qscale offset between IP and B-frames
1745 * - encoding: Set by user.
1746 * - decoding: unused
1748 float b_quant_offset;
1751 * Size of the frame reordering buffer in the decoder.
1752 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1753 * - encoding: Set by libavcodec.
1754 * - decoding: Set by libavcodec.
1759 * 0-> h263 quant 1-> mpeg quant
1760 * - encoding: Set by user.
1761 * - decoding: unused
1766 * qscale factor between P and I-frames
1767 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1768 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1769 * - encoding: Set by user.
1770 * - decoding: unused
1772 float i_quant_factor;
1775 * qscale offset between P and I-frames
1776 * - encoding: Set by user.
1777 * - decoding: unused
1779 float i_quant_offset;
1782 * luminance masking (0-> disabled)
1783 * - encoding: Set by user.
1784 * - decoding: unused
1789 * temporary complexity masking (0-> disabled)
1790 * - encoding: Set by user.
1791 * - decoding: unused
1793 float temporal_cplx_masking;
1796 * spatial complexity masking (0-> disabled)
1797 * - encoding: Set by user.
1798 * - decoding: unused
1800 float spatial_cplx_masking;
1803 * p block masking (0-> disabled)
1804 * - encoding: Set by user.
1805 * - decoding: unused
1810 * darkness masking (0-> disabled)
1811 * - encoding: Set by user.
1812 * - decoding: unused
1818 * - encoding: Set by libavcodec.
1819 * - decoding: Set by user (or 0).
1823 * prediction method (needed for huffyuv)
1824 * - encoding: Set by user.
1825 * - decoding: unused
1827 int prediction_method;
1828 #define FF_PRED_LEFT 0
1829 #define FF_PRED_PLANE 1
1830 #define FF_PRED_MEDIAN 2
1833 * slice offsets in the frame in bytes
1834 * - encoding: Set/allocated by libavcodec.
1835 * - decoding: Set/allocated by user (or NULL).
1840 * sample aspect ratio (0 if unknown)
1841 * That is the width of a pixel divided by the height of the pixel.
1842 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1843 * - encoding: Set by user.
1844 * - decoding: Set by libavcodec.
1846 AVRational sample_aspect_ratio;
1849 * motion estimation comparison function
1850 * - encoding: Set by user.
1851 * - decoding: unused
1855 * subpixel motion estimation comparison function
1856 * - encoding: Set by user.
1857 * - decoding: unused
1861 * macroblock comparison function (not supported yet)
1862 * - encoding: Set by user.
1863 * - decoding: unused
1867 * interlaced DCT comparison function
1868 * - encoding: Set by user.
1869 * - decoding: unused
1872 #define FF_CMP_SAD 0
1873 #define FF_CMP_SSE 1
1874 #define FF_CMP_SATD 2
1875 #define FF_CMP_DCT 3
1876 #define FF_CMP_PSNR 4
1877 #define FF_CMP_BIT 5
1879 #define FF_CMP_ZERO 7
1880 #define FF_CMP_VSAD 8
1881 #define FF_CMP_VSSE 9
1882 #define FF_CMP_NSSE 10
1883 #define FF_CMP_W53 11
1884 #define FF_CMP_W97 12
1885 #define FF_CMP_DCTMAX 13
1886 #define FF_CMP_DCT264 14
1887 #define FF_CMP_CHROMA 256
1890 * ME diamond size & shape
1891 * - encoding: Set by user.
1892 * - decoding: unused
1897 * amount of previous MV predictors (2a+1 x 2a+1 square)
1898 * - encoding: Set by user.
1899 * - decoding: unused
1901 int last_predictor_count;
1904 * prepass for motion estimation
1905 * - encoding: Set by user.
1906 * - decoding: unused
1911 * motion estimation prepass comparison function
1912 * - encoding: Set by user.
1913 * - decoding: unused
1918 * ME prepass diamond size & shape
1919 * - encoding: Set by user.
1920 * - decoding: unused
1926 * - encoding: Set by user.
1927 * - decoding: unused
1929 int me_subpel_quality;
1932 * DTG active format information (additional aspect ratio
1933 * information only used in DVB MPEG-2 transport streams)
1936 * - encoding: unused
1937 * - decoding: Set by decoder.
1939 int dtg_active_format;
1940 #define FF_DTG_AFD_SAME 8
1941 #define FF_DTG_AFD_4_3 9
1942 #define FF_DTG_AFD_16_9 10
1943 #define FF_DTG_AFD_14_9 11
1944 #define FF_DTG_AFD_4_3_SP_14_9 13
1945 #define FF_DTG_AFD_16_9_SP_14_9 14
1946 #define FF_DTG_AFD_SP_4_3 15
1949 * maximum motion estimation search range in subpel units
1950 * If 0 then no limit.
1952 * - encoding: Set by user.
1953 * - decoding: unused
1958 * intra quantizer bias
1959 * - encoding: Set by user.
1960 * - decoding: unused
1962 int intra_quant_bias;
1963 #define FF_DEFAULT_QUANT_BIAS 999999
1966 * inter quantizer bias
1967 * - encoding: Set by user.
1968 * - decoding: unused
1970 int inter_quant_bias;
1972 #if FF_API_COLOR_TABLE_ID
1975 * - encoding: unused
1976 * - decoding: Which clrtable should be used for 8bit RGB images.
1977 * Tables have to be stored somewhere. FIXME
1979 attribute_deprecated int color_table_id;
1984 * - encoding: unused
1985 * - decoding: Set by user.
1988 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1989 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1990 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1993 * XVideo Motion Acceleration
1994 * - encoding: forbidden
1995 * - decoding: set by decoder
1997 int xvmc_acceleration;
2000 * macroblock decision mode
2001 * - encoding: Set by user.
2002 * - decoding: unused
2005 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2006 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2007 #define FF_MB_DECISION_RD 2 ///< rate distortion
2010 * custom intra quantization matrix
2011 * - encoding: Set by user, can be NULL.
2012 * - decoding: Set by libavcodec.
2014 uint16_t *intra_matrix;
2017 * custom inter quantization matrix
2018 * - encoding: Set by user, can be NULL.
2019 * - decoding: Set by libavcodec.
2021 uint16_t *inter_matrix;
2024 * scene change detection threshold
2025 * 0 is default, larger means fewer detected scene changes.
2026 * - encoding: Set by user.
2027 * - decoding: unused
2029 int scenechange_threshold;
2032 * noise reduction strength
2033 * - encoding: Set by user.
2034 * - decoding: unused
2036 int noise_reduction;
2038 #if FF_API_INTER_THRESHOLD
2040 * @deprecated this field is unused
2042 attribute_deprecated int inter_threshold;
2045 #if FF_API_MPV_GLOBAL_OPTS
2047 * @deprecated use mpegvideo private options instead
2049 attribute_deprecated int quantizer_noise_shaping;
2053 * Motion estimation threshold below which no motion estimation is
2054 * performed, but instead the user specified motion vectors are used.
2056 * - encoding: Set by user.
2057 * - decoding: unused
2062 * Macroblock threshold below which the user specified macroblock types will be used.
2063 * - encoding: Set by user.
2064 * - decoding: unused
2069 * precision of the intra DC coefficient - 8
2070 * - encoding: Set by user.
2071 * - decoding: unused
2073 int intra_dc_precision;
2076 * Number of macroblock rows at the top which are skipped.
2077 * - encoding: unused
2078 * - decoding: Set by user.
2083 * Number of macroblock rows at the bottom which are skipped.
2084 * - encoding: unused
2085 * - decoding: Set by user.
2090 * Border processing masking, raises the quantizer for mbs on the borders
2092 * - encoding: Set by user.
2093 * - decoding: unused
2095 float border_masking;
2098 * minimum MB lagrange multipler
2099 * - encoding: Set by user.
2100 * - decoding: unused
2105 * maximum MB lagrange multipler
2106 * - encoding: Set by user.
2107 * - decoding: unused
2113 * - encoding: Set by user.
2114 * - decoding: unused
2116 int me_penalty_compensation;
2120 * - encoding: Set by user.
2121 * - decoding: unused
2127 * - encoding: Set by user.
2128 * - decoding: unused
2134 * - encoding: Set by user.
2135 * - decoding: unused
2140 * number of reference frames
2141 * - encoding: Set by user.
2142 * - decoding: Set by lavc.
2147 * chroma qp offset from luma
2148 * - encoding: Set by user.
2149 * - decoding: unused
2154 * Multiplied by qscale for each frame and added to scene_change_score.
2155 * - encoding: Set by user.
2156 * - decoding: unused
2158 int scenechange_factor;
2162 * Note: Value depends upon the compare function used for fullpel ME.
2163 * - encoding: Set by user.
2164 * - decoding: unused
2169 * Adjust sensitivity of b_frame_strategy 1.
2170 * - encoding: Set by user.
2171 * - decoding: unused
2176 * Chromaticity coordinates of the source primaries.
2177 * - encoding: Set by user
2178 * - decoding: Set by libavcodec
2180 enum AVColorPrimaries color_primaries;
2183 * Color Transfer Characteristic.
2184 * - encoding: Set by user
2185 * - decoding: Set by libavcodec
2187 enum AVColorTransferCharacteristic color_trc;
2190 * YUV colorspace type.
2191 * - encoding: Set by user
2192 * - decoding: Set by libavcodec
2194 enum AVColorSpace colorspace;
2197 * MPEG vs JPEG YUV range.
2198 * - encoding: Set by user
2199 * - decoding: Set by libavcodec
2201 enum AVColorRange color_range;
2204 * This defines the location of chroma samples.
2205 * - encoding: Set by user
2206 * - decoding: Set by libavcodec
2208 enum AVChromaLocation chroma_sample_location;
2212 * Indicates number of picture subdivisions. Used for parallelized
2214 * - encoding: Set by user
2215 * - decoding: unused
2220 * - encoding: set by libavcodec
2221 * - decoding: Set by libavcodec
2223 enum AVFieldOrder field_order;
2226 int sample_rate; ///< samples per second
2227 int channels; ///< number of audio channels
2230 * audio sample format
2231 * - encoding: Set by user.
2232 * - decoding: Set by libavcodec.
2234 enum AVSampleFormat sample_fmt; ///< sample format
2236 /* The following data should not be initialized. */
2238 * Samples per packet, initialized when calling 'init'.
2243 * Frame counter, set by libavcodec.
2245 * - decoding: total number of frames returned from the decoder so far.
2246 * - encoding: total number of frames passed to the encoder so far.
2248 * @note the counter is not incremented if encoding/decoding resulted in
2254 * number of bytes per packet if constant and known or 0
2255 * Used by some WAV based audio codecs.
2260 * Audio cutoff bandwidth (0 means "automatic")
2261 * - encoding: Set by user.
2262 * - decoding: unused
2266 #if FF_API_REQUEST_CHANNELS
2268 * Decoder should decode to this many channels if it can (0 for default)
2269 * - encoding: unused
2270 * - decoding: Set by user.
2271 * @deprecated Deprecated in favor of request_channel_layout.
2273 int request_channels;
2277 * Audio channel layout.
2278 * - encoding: set by user.
2279 * - decoding: set by user, may be overwritten by libavcodec.
2281 uint64_t channel_layout;
2284 * Request decoder to use this channel layout if it can (0 for default)
2285 * - encoding: unused
2286 * - decoding: Set by user.
2288 uint64_t request_channel_layout;
2291 * Type of service that the audio stream conveys.
2292 * - encoding: Set by user.
2293 * - decoding: Set by libavcodec.
2295 enum AVAudioServiceType audio_service_type;
2298 * desired sample format
2299 * - encoding: Not used.
2300 * - decoding: Set by user.
2301 * Decoder will decode to this format if it can.
2303 enum AVSampleFormat request_sample_fmt;
2306 * Called at the beginning of each frame to get a buffer for it.
2308 * The function will set AVFrame.data[], AVFrame.linesize[].
2309 * AVFrame.extended_data[] must also be set, but it should be the same as
2310 * AVFrame.data[] except for planar audio with more channels than can fit
2311 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2312 * many data pointers as it can hold.
2314 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2315 * avcodec_default_get_buffer() instead of providing buffers allocated by
2318 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2319 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2320 * but if get_buffer() is overridden then alignment considerations should
2321 * be taken into account.
2323 * @see avcodec_default_get_buffer()
2327 * If pic.reference is set then the frame will be read later by libavcodec.
2328 * avcodec_align_dimensions2() should be used to find the required width and
2329 * height, as they normally need to be rounded up to the next multiple of 16.
2331 * If frame multithreading is used and thread_safe_callbacks is set,
2332 * it may be called from a different thread, but not from more than one at
2333 * once. Does not need to be reentrant.
2335 * @see release_buffer(), reget_buffer()
2336 * @see avcodec_align_dimensions2()
2340 * Decoders request a buffer of a particular size by setting
2341 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2342 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2343 * to a smaller value in the output frame.
2345 * Decoders cannot use the buffer after returning from
2346 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2347 * is assumed to be released immediately upon return.
2349 * As a convenience, av_samples_get_buffer_size() and
2350 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2351 * functions to find the required data size and to fill data pointers and
2352 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2353 * since all planes must be the same size.
2355 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2357 * - encoding: unused
2358 * - decoding: Set by libavcodec, user can override.
2360 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2363 * Called to release buffers which were allocated with get_buffer.
2364 * A released buffer can be reused in get_buffer().
2365 * pic.data[*] must be set to NULL.
2366 * May be called from a different thread if frame multithreading is used,
2367 * but not by more than one thread at once, so does not need to be reentrant.
2368 * - encoding: unused
2369 * - decoding: Set by libavcodec, user can override.
2371 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2374 * Called at the beginning of a frame to get cr buffer for it.
2375 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2376 * libavcodec will pass previous buffer in pic, function should return
2377 * same buffer or new buffer with old frame "painted" into it.
2378 * If pic.data[0] == NULL must behave like get_buffer().
2379 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2380 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2382 * - encoding: unused
2383 * - decoding: Set by libavcodec, user can override.
2385 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2388 /* - encoding parameters */
2389 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2390 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2394 * - encoding: Set by user.
2395 * - decoding: unused
2401 * - encoding: Set by user.
2402 * - decoding: unused
2407 * maximum quantizer difference between frames
2408 * - encoding: Set by user.
2409 * - decoding: unused
2414 * ratecontrol qmin qmax limiting method
2415 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2416 * - encoding: Set by user.
2417 * - decoding: unused
2425 * decoder bitstream buffer size
2426 * - encoding: Set by user.
2427 * - decoding: unused
2432 * ratecontrol override, see RcOverride
2433 * - encoding: Allocated/set/freed by user.
2434 * - decoding: unused
2436 int rc_override_count;
2437 RcOverride *rc_override;
2440 * rate control equation
2441 * - encoding: Set by user
2442 * - decoding: unused
2448 * - encoding: Set by user.
2449 * - decoding: unused
2455 * - encoding: Set by user.
2456 * - decoding: unused
2460 float rc_buffer_aggressivity;
2463 * initial complexity for pass1 ratecontrol
2464 * - encoding: Set by user.
2465 * - decoding: unused
2467 float rc_initial_cplx;
2470 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2471 * - encoding: Set by user.
2472 * - decoding: unused.
2474 float rc_max_available_vbv_use;
2477 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2478 * - encoding: Set by user.
2479 * - decoding: unused.
2481 float rc_min_vbv_overflow_use;
2484 * Number of bits which should be loaded into the rc buffer before decoding starts.
2485 * - encoding: Set by user.
2486 * - decoding: unused
2488 int rc_initial_buffer_occupancy;
2490 #define FF_CODER_TYPE_VLC 0
2491 #define FF_CODER_TYPE_AC 1
2492 #define FF_CODER_TYPE_RAW 2
2493 #define FF_CODER_TYPE_RLE 3
2494 #define FF_CODER_TYPE_DEFLATE 4
2497 * - encoding: Set by user.
2498 * - decoding: unused
2504 * - encoding: Set by user.
2505 * - decoding: unused
2510 * minimum Lagrange multipler
2511 * - encoding: Set by user.
2512 * - decoding: unused
2517 * maximum Lagrange multipler
2518 * - encoding: Set by user.
2519 * - decoding: unused
2524 * frame skip threshold
2525 * - encoding: Set by user.
2526 * - decoding: unused
2528 int frame_skip_threshold;
2532 * - encoding: Set by user.
2533 * - decoding: unused
2535 int frame_skip_factor;
2538 * frame skip exponent
2539 * - encoding: Set by user.
2540 * - decoding: unused
2545 * frame skip comparison function
2546 * - encoding: Set by user.
2547 * - decoding: unused
2552 * trellis RD quantization
2553 * - encoding: Set by user.
2554 * - decoding: unused
2559 * - encoding: Set by user.
2560 * - decoding: unused
2562 int min_prediction_order;
2565 * - encoding: Set by user.
2566 * - decoding: unused
2568 int max_prediction_order;
2571 * GOP timecode frame start number
2572 * - encoding: Set by user, in non drop frame format
2573 * - decoding: Set by libavcodec (timecode in the 25 bits format, -1 if unset)
2575 int64_t timecode_frame_start;
2577 /* The RTP callback: This function is called */
2578 /* every time the encoder has a packet to send. */
2579 /* It depends on the encoder if the data starts */
2580 /* with a Start Code (it should). H.263 does. */
2581 /* mb_nb contains the number of macroblocks */
2582 /* encoded in the RTP payload. */
2583 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2585 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2586 /* do its best to deliver a chunk with size */
2587 /* below rtp_payload_size, the chunk will start */
2588 /* with a start code on some codecs like H.263. */
2589 /* This doesn't take account of any particular */
2590 /* headers inside the transmitted RTP payload. */
2592 /* statistics, used for 2-pass encoding */
2603 * number of bits used for the previously encoded frame
2604 * - encoding: Set by libavcodec.
2605 * - decoding: unused
2610 * pass1 encoding statistics output buffer
2611 * - encoding: Set by libavcodec.
2612 * - decoding: unused
2617 * pass2 encoding statistics input buffer
2618 * Concatenated stuff from stats_out of pass1 should be placed here.
2619 * - encoding: Allocated/set/freed by user.
2620 * - decoding: unused
2625 * Work around bugs in encoders which sometimes cannot be detected automatically.
2626 * - encoding: Set by user
2627 * - decoding: Set by user
2629 int workaround_bugs;
2630 #define FF_BUG_AUTODETECT 1 ///< autodetection
2631 #define FF_BUG_OLD_MSMPEG4 2
2632 #define FF_BUG_XVID_ILACE 4
2633 #define FF_BUG_UMP4 8
2634 #define FF_BUG_NO_PADDING 16
2635 #define FF_BUG_AMV 32
2636 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2637 #define FF_BUG_QPEL_CHROMA 64
2638 #define FF_BUG_STD_QPEL 128
2639 #define FF_BUG_QPEL_CHROMA2 256
2640 #define FF_BUG_DIRECT_BLOCKSIZE 512
2641 #define FF_BUG_EDGE 1024
2642 #define FF_BUG_HPEL_CHROMA 2048
2643 #define FF_BUG_DC_CLIP 4096
2644 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2645 #define FF_BUG_TRUNCATED 16384
2648 * strictly follow the standard (MPEG4, ...).
2649 * - encoding: Set by user.
2650 * - decoding: Set by user.
2651 * Setting this to STRICT or higher means the encoder and decoder will
2652 * generally do stupid things, whereas setting it to unofficial or lower
2653 * will mean the encoder might produce output that is not supported by all
2654 * spec-compliant decoders. Decoders don't differentiate between normal,
2655 * unofficial and experimental (that is, they always try to decode things
2656 * when they can) unless they are explicitly asked to behave stupidly
2657 * (=strictly conform to the specs)
2659 int strict_std_compliance;
2660 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2661 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2662 #define FF_COMPLIANCE_NORMAL 0
2663 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2664 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2667 * error concealment flags
2668 * - encoding: unused
2669 * - decoding: Set by user.
2671 int error_concealment;
2672 #define FF_EC_GUESS_MVS 1
2673 #define FF_EC_DEBLOCK 2
2677 * - encoding: Set by user.
2678 * - decoding: Set by user.
2681 #define FF_DEBUG_PICT_INFO 1
2682 #define FF_DEBUG_RC 2
2683 #define FF_DEBUG_BITSTREAM 4
2684 #define FF_DEBUG_MB_TYPE 8
2685 #define FF_DEBUG_QP 16
2686 #define FF_DEBUG_MV 32
2687 #define FF_DEBUG_DCT_COEFF 0x00000040
2688 #define FF_DEBUG_SKIP 0x00000080
2689 #define FF_DEBUG_STARTCODE 0x00000100
2690 #define FF_DEBUG_PTS 0x00000200
2691 #define FF_DEBUG_ER 0x00000400
2692 #define FF_DEBUG_MMCO 0x00000800
2693 #define FF_DEBUG_BUGS 0x00001000
2694 #define FF_DEBUG_VIS_QP 0x00002000
2695 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2696 #define FF_DEBUG_BUFFERS 0x00008000
2697 #define FF_DEBUG_THREADS 0x00010000
2701 * - encoding: Set by user.
2702 * - decoding: Set by user.
2705 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2706 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2707 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2710 * Error recognition; may misdetect some more or less valid parts as errors.
2711 * - encoding: unused
2712 * - decoding: Set by user.
2714 int err_recognition;
2715 #define AV_EF_CRCCHECK (1<<0)
2716 #define AV_EF_BITSTREAM (1<<1)
2717 #define AV_EF_BUFFER (1<<2)
2718 #define AV_EF_EXPLODE (1<<3)
2720 #define AV_EF_CAREFUL (1<<16)
2721 #define AV_EF_COMPLIANT (1<<17)
2722 #define AV_EF_AGGRESSIVE (1<<18)
2726 * opaque 64bit number (generally a PTS) that will be reordered and
2727 * output in AVFrame.reordered_opaque
2728 * @deprecated in favor of pkt_pts
2729 * - encoding: unused
2730 * - decoding: Set by user.
2732 int64_t reordered_opaque;
2735 * Hardware accelerator in use
2736 * - encoding: unused.
2737 * - decoding: Set by libavcodec
2739 struct AVHWAccel *hwaccel;
2742 * Hardware accelerator context.
2743 * For some hardware accelerators, a global context needs to be
2744 * provided by the user. In that case, this holds display-dependent
2745 * data FFmpeg cannot instantiate itself. Please refer to the
2746 * FFmpeg HW accelerator documentation to know how to fill this
2747 * is. e.g. for VA API, this is a struct vaapi_context.
2748 * - encoding: unused
2749 * - decoding: Set by user
2751 void *hwaccel_context;
2755 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2756 * - decoding: unused
2758 uint64_t error[AV_NUM_DATA_POINTERS];
2761 * DCT algorithm, see FF_DCT_* below
2762 * - encoding: Set by user.
2763 * - decoding: unused
2766 #define FF_DCT_AUTO 0
2767 #define FF_DCT_FASTINT 1
2768 #define FF_DCT_INT 2
2769 #define FF_DCT_MMX 3
2770 #define FF_DCT_ALTIVEC 5
2771 #define FF_DCT_FAAN 6
2774 * IDCT algorithm, see FF_IDCT_* below.
2775 * - encoding: Set by user.
2776 * - decoding: Set by user.
2779 #define FF_IDCT_AUTO 0
2780 #define FF_IDCT_INT 1
2781 #define FF_IDCT_SIMPLE 2
2782 #define FF_IDCT_SIMPLEMMX 3
2783 #define FF_IDCT_LIBMPEG2MMX 4
2784 #define FF_IDCT_MMI 5
2785 #define FF_IDCT_ARM 7
2786 #define FF_IDCT_ALTIVEC 8
2787 #define FF_IDCT_SH4 9
2788 #define FF_IDCT_SIMPLEARM 10
2789 #define FF_IDCT_H264 11
2790 #define FF_IDCT_VP3 12
2791 #define FF_IDCT_IPP 13
2792 #define FF_IDCT_XVIDMMX 14
2793 #define FF_IDCT_CAVS 15
2794 #define FF_IDCT_SIMPLEARMV5TE 16
2795 #define FF_IDCT_SIMPLEARMV6 17
2796 #define FF_IDCT_SIMPLEVIS 18
2797 #define FF_IDCT_WMV2 19
2798 #define FF_IDCT_FAAN 20
2799 #define FF_IDCT_EA 21
2800 #define FF_IDCT_SIMPLENEON 22
2801 #define FF_IDCT_SIMPLEALPHA 23
2802 #define FF_IDCT_BINK 24
2807 * @deprecated use av_set_cpu_flags_mask() instead.
2809 attribute_deprecated unsigned dsp_mask;
2813 * bits per sample/pixel from the demuxer (needed for huffyuv).
2814 * - encoding: Set by libavcodec.
2815 * - decoding: Set by user.
2817 int bits_per_coded_sample;
2820 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2821 * - encoding: set by user.
2822 * - decoding: set by libavcodec.
2824 int bits_per_raw_sample;
2827 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2828 * - encoding: unused
2829 * - decoding: Set by user.
2834 * the picture in the bitstream
2835 * - encoding: Set by libavcodec.
2836 * - decoding: Set by libavcodec.
2838 AVFrame *coded_frame;
2842 * is used to decide how many independent tasks should be passed to execute()
2843 * - encoding: Set by user.
2844 * - decoding: Set by user.
2849 * Which multithreading methods to use.
2850 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2851 * so clients which cannot provide future frames should not use it.
2853 * - encoding: Set by user, otherwise the default is used.
2854 * - decoding: Set by user, otherwise the default is used.
2857 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2858 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2861 * Which multithreading methods are in use by the codec.
2862 * - encoding: Set by libavcodec.
2863 * - decoding: Set by libavcodec.
2865 int active_thread_type;
2868 * Set by the client if its custom get_buffer() callback can be called
2869 * synchronously from another thread, which allows faster multithreaded decoding.
2870 * draw_horiz_band() will be called from other threads regardless of this setting.
2871 * Ignored if the default get_buffer() is used.
2872 * - encoding: Set by user.
2873 * - decoding: Set by user.
2875 int thread_safe_callbacks;
2878 * The codec may call this to execute several independent things.
2879 * It will return only after finishing all tasks.
2880 * The user may replace this with some multithreaded implementation,
2881 * the default implementation will execute the parts serially.
2882 * @param count the number of things to execute
2883 * - encoding: Set by libavcodec, user can override.
2884 * - decoding: Set by libavcodec, user can override.
2886 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2889 * The codec may call this to execute several independent things.
2890 * It will return only after finishing all tasks.
2891 * The user may replace this with some multithreaded implementation,
2892 * the default implementation will execute the parts serially.
2893 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2894 * @param c context passed also to func
2895 * @param count the number of things to execute
2896 * @param arg2 argument passed unchanged to func
2897 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2898 * @param func function that will be called count times, with jobnr from 0 to count-1.
2899 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2900 * two instances of func executing at the same time will have the same threadnr.
2901 * @return always 0 currently, but code should handle a future improvement where when any call to func
2902 * returns < 0 no further calls to func may be done and < 0 is returned.
2903 * - encoding: Set by libavcodec, user can override.
2904 * - decoding: Set by libavcodec, user can override.
2906 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2910 * Can be used by execute() to store some per AVCodecContext stuff.
2911 * - encoding: set by execute()
2912 * - decoding: set by execute()
2914 void *thread_opaque;
2917 * noise vs. sse weight for the nsse comparsion function
2918 * - encoding: Set by user.
2919 * - decoding: unused
2925 * - encoding: Set by user.
2926 * - decoding: Set by libavcodec.
2929 #define FF_PROFILE_UNKNOWN -99
2930 #define FF_PROFILE_RESERVED -100
2932 #define FF_PROFILE_AAC_MAIN 0
2933 #define FF_PROFILE_AAC_LOW 1
2934 #define FF_PROFILE_AAC_SSR 2
2935 #define FF_PROFILE_AAC_LTP 3
2936 #define FF_PROFILE_AAC_HE 4
2937 #define FF_PROFILE_AAC_HE_V2 28
2938 #define FF_PROFILE_AAC_LD 22
2939 #define FF_PROFILE_AAC_ELD 38
2941 #define FF_PROFILE_DTS 20
2942 #define FF_PROFILE_DTS_ES 30
2943 #define FF_PROFILE_DTS_96_24 40
2944 #define FF_PROFILE_DTS_HD_HRA 50
2945 #define FF_PROFILE_DTS_HD_MA 60
2947 #define FF_PROFILE_MPEG2_422 0
2948 #define FF_PROFILE_MPEG2_HIGH 1
2949 #define FF_PROFILE_MPEG2_SS 2
2950 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2951 #define FF_PROFILE_MPEG2_MAIN 4
2952 #define FF_PROFILE_MPEG2_SIMPLE 5
2954 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2955 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2957 #define FF_PROFILE_H264_BASELINE 66
2958 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2959 #define FF_PROFILE_H264_MAIN 77
2960 #define FF_PROFILE_H264_EXTENDED 88
2961 #define FF_PROFILE_H264_HIGH 100
2962 #define FF_PROFILE_H264_HIGH_10 110
2963 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2964 #define FF_PROFILE_H264_HIGH_422 122
2965 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2966 #define FF_PROFILE_H264_HIGH_444 144
2967 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2968 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2969 #define FF_PROFILE_H264_CAVLC_444 44
2971 #define FF_PROFILE_VC1_SIMPLE 0
2972 #define FF_PROFILE_VC1_MAIN 1
2973 #define FF_PROFILE_VC1_COMPLEX 2
2974 #define FF_PROFILE_VC1_ADVANCED 3
2976 #define FF_PROFILE_MPEG4_SIMPLE 0
2977 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2978 #define FF_PROFILE_MPEG4_CORE 2
2979 #define FF_PROFILE_MPEG4_MAIN 3
2980 #define FF_PROFILE_MPEG4_N_BIT 4
2981 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2982 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2983 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2984 #define FF_PROFILE_MPEG4_HYBRID 8
2985 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2986 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2987 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2988 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2989 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2990 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2991 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2995 * - encoding: Set by user.
2996 * - decoding: Set by libavcodec.
2999 #define FF_LEVEL_UNKNOWN -99
3003 * - encoding: unused
3004 * - decoding: Set by user.
3006 enum AVDiscard skip_loop_filter;
3010 * - encoding: unused
3011 * - decoding: Set by user.
3013 enum AVDiscard skip_idct;
3017 * - encoding: unused
3018 * - decoding: Set by user.
3020 enum AVDiscard skip_frame;
3023 * Header containing style information for text subtitles.
3024 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3025 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3026 * the Format line following. It shouldn't include any Dialogue line.
3027 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3028 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3030 uint8_t *subtitle_header;
3031 int subtitle_header_size;
3034 * Simulates errors in the bitstream to test error concealment.
3035 * - encoding: Set by user.
3036 * - decoding: unused
3041 * Current packet as passed into the decoder, to avoid having
3042 * to pass the packet into every function. Currently only valid
3043 * inside lavc and get/release_buffer callbacks.
3044 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
3045 * - encoding: unused
3050 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3051 * Used for compliant TS muxing.
3052 * - encoding: Set by libavcodec.
3053 * - decoding: unused.
3058 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3059 * Code outside libavcodec should access this field using:
3060 * avcodec_set_pkt_timebase(avctx)
3061 * - encoding unused.
3062 * - decodimg set by user
3064 AVRational pkt_timebase;
3068 * Code outside libavcodec should access this field using:
3069 * avcodec_get_codec_descriptior(avctx)
3070 * - encoding: unused.
3071 * - decoding: set by libavcodec.
3073 const AVCodecDescriptor *codec_descriptor;
3076 * Current statistics for PTS correction.
3077 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3078 * - encoding: unused
3080 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3081 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3082 int64_t pts_correction_last_pts; /// PTS of the last frame
3083 int64_t pts_correction_last_dts; /// DTS of the last frame
3086 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3087 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3089 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3090 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3095 typedef struct AVProfile {
3097 const char *name; ///< short name for the profile
3100 typedef struct AVCodecDefault AVCodecDefault;
3105 typedef struct AVCodec {
3107 * Name of the codec implementation.
3108 * The name is globally unique among encoders and among decoders (but an
3109 * encoder and a decoder can share the same name).
3110 * This is the primary way to find a codec from the user perspective.
3114 * Descriptive name for the codec, meant to be more human readable than name.
3115 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3117 const char *long_name;
3118 enum AVMediaType type;
3121 * Codec capabilities.
3125 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3126 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3127 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3128 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3129 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3130 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3131 const AVClass *priv_class; ///< AVClass for the private context
3132 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3134 /*****************************************************************
3135 * No fields below this line are part of the public API. They
3136 * may not be used outside of libavcodec and can be changed and
3138 * New public fields should be added right above.
3139 *****************************************************************
3142 struct AVCodec *next;
3144 * @name Frame-level threading support functions
3148 * If defined, called on thread contexts when they are created.
3149 * If the codec allocates writable tables in init(), re-allocate them here.
3150 * priv_data will be set to a copy of the original.
3152 int (*init_thread_copy)(AVCodecContext *);
3154 * Copy necessary context variables from a previous thread context to the current one.
3155 * If not defined, the next thread will start automatically; otherwise, the codec
3156 * must call ff_thread_finish_setup().
3158 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3160 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3164 * Private codec-specific defaults.
3166 const AVCodecDefault *defaults;
3169 * Initialize codec static data, called from avcodec_register().
3171 void (*init_static_data)(struct AVCodec *codec);
3173 int (*init)(AVCodecContext *);
3174 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
3176 * Encode data to an AVPacket.
3178 * @param avctx codec context
3179 * @param avpkt output AVPacket (may contain a user-provided buffer)
3180 * @param[in] frame AVFrame containing the raw data to be encoded
3181 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3182 * non-empty packet was returned in avpkt.
3183 * @return 0 on success, negative error code on failure
3185 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3186 int *got_packet_ptr);
3187 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3188 int (*close)(AVCodecContext *);
3191 * Will be called when seeking
3193 void (*flush)(AVCodecContext *);
3199 typedef struct AVHWAccel {
3201 * Name of the hardware accelerated codec.
3202 * The name is globally unique among encoders and among decoders (but an
3203 * encoder and a decoder can share the same name).
3208 * Type of codec implemented by the hardware accelerator.
3210 * See AVMEDIA_TYPE_xxx
3212 enum AVMediaType type;
3215 * Codec implemented by the hardware accelerator.
3217 * See AV_CODEC_ID_xxx
3222 * Supported pixel format.
3224 * Only hardware accelerated formats are supported here.
3226 enum PixelFormat pix_fmt;
3229 * Hardware accelerated codec capabilities.
3230 * see FF_HWACCEL_CODEC_CAP_*
3234 struct AVHWAccel *next;
3237 * Called at the beginning of each frame or field picture.
3239 * Meaningful frame information (codec specific) is guaranteed to
3240 * be parsed at this point. This function is mandatory.
3242 * Note that buf can be NULL along with buf_size set to 0.
3243 * Otherwise, this means the whole frame is available at this point.
3245 * @param avctx the codec context
3246 * @param buf the frame data buffer base
3247 * @param buf_size the size of the frame in bytes
3248 * @return zero if successful, a negative value otherwise
3250 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3253 * Callback for each slice.
3255 * Meaningful slice information (codec specific) is guaranteed to
3256 * be parsed at this point. This function is mandatory.
3258 * @param avctx the codec context
3259 * @param buf the slice data buffer base
3260 * @param buf_size the size of the slice in bytes
3261 * @return zero if successful, a negative value otherwise
3263 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3266 * Called at the end of each frame or field picture.
3268 * The whole picture is parsed at this point and can now be sent
3269 * to the hardware accelerator. This function is mandatory.
3271 * @param avctx the codec context
3272 * @return zero if successful, a negative value otherwise
3274 int (*end_frame)(AVCodecContext *avctx);
3277 * Size of HW accelerator private data.
3279 * Private data is allocated with av_mallocz() before
3280 * AVCodecContext.get_buffer() and deallocated after
3281 * AVCodecContext.release_buffer().
3287 * @defgroup lavc_picture AVPicture
3289 * Functions for working with AVPicture
3294 * four components are given, that's all.
3295 * the last component is alpha
3297 typedef struct AVPicture {
3298 uint8_t *data[AV_NUM_DATA_POINTERS];
3299 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3306 enum AVSubtitleType {
3309 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3312 * Plain text, the text field must be set by the decoder and is
3313 * authoritative. ass and pict fields may contain approximations.
3318 * Formatted text, the ass field must be set by the decoder and is
3319 * authoritative. pict and text fields may contain approximations.
3324 typedef struct AVSubtitleRect {
3325 int x; ///< top left corner of pict, undefined when pict is not set
3326 int y; ///< top left corner of pict, undefined when pict is not set
3327 int w; ///< width of pict, undefined when pict is not set
3328 int h; ///< height of pict, undefined when pict is not set
3329 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3332 * data+linesize for the bitmap of this subtitle.
3333 * can be set for text/ass as well once they where rendered
3336 enum AVSubtitleType type;
3338 char *text; ///< 0 terminated plain UTF-8 text
3341 * 0 terminated ASS/SSA compatible event line.
3342 * The presentation of this is unaffected by the other values in this
3348 * 1 indicates this subtitle is a forced subtitle.
3349 * A forced subtitle should be displayed even when subtitles are hidden.
3354 typedef struct AVSubtitle {
3355 uint16_t format; /* 0 = graphics */
3356 uint32_t start_display_time; /* relative to packet pts, in ms */
3357 uint32_t end_display_time; /* relative to packet pts, in ms */
3359 AVSubtitleRect **rects;
3360 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3364 * If c is NULL, returns the first registered codec,
3365 * if c is non-NULL, returns the next registered codec after c,
3366 * or NULL if c is the last one.
3368 AVCodec *av_codec_next(const AVCodec *c);
3371 * Return the LIBAVCODEC_VERSION_INT constant.
3373 unsigned avcodec_version(void);
3376 * Return the libavcodec build-time configuration.
3378 const char *avcodec_configuration(void);
3381 * Return the libavcodec license.
3383 const char *avcodec_license(void);
3386 * Register the codec codec and initialize libavcodec.
3388 * @warning either this function or avcodec_register_all() must be called
3389 * before any other libavcodec functions.
3391 * @see avcodec_register_all()
3393 void avcodec_register(AVCodec *codec);
3396 * Register all the codecs, parsers and bitstream filters which were enabled at
3397 * configuration time. If you do not call this function you can select exactly
3398 * which formats you want to support, by using the individual registration
3401 * @see avcodec_register
3402 * @see av_register_codec_parser
3403 * @see av_register_bitstream_filter
3405 void avcodec_register_all(void);
3408 #if FF_API_ALLOC_CONTEXT
3410 * Allocate an AVCodecContext and set its fields to default values. The
3411 * resulting struct can be deallocated by simply calling av_free().
3413 * @return An AVCodecContext filled with default values or NULL on failure.
3414 * @see avcodec_get_context_defaults
3416 * @deprecated use avcodec_alloc_context3()
3418 attribute_deprecated
3419 AVCodecContext *avcodec_alloc_context(void);
3421 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3422 * we WILL change its arguments and name a few times! */
3423 attribute_deprecated
3424 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3427 * Set the fields of the given AVCodecContext to default values.
3429 * @param s The AVCodecContext of which the fields should be set to default values.
3430 * @deprecated use avcodec_get_context_defaults3
3432 attribute_deprecated
3433 void avcodec_get_context_defaults(AVCodecContext *s);
3435 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3436 * we WILL change its arguments and name a few times! */
3437 attribute_deprecated
3438 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3442 * Allocate an AVCodecContext and set its fields to default values. The
3443 * resulting struct can be deallocated by calling avcodec_close() on it followed
3446 * @param codec if non-NULL, allocate private data and initialize defaults
3447 * for the given codec. It is illegal to then call avcodec_open2()
3448 * with a different codec.
3449 * If NULL, then the codec-specific defaults won't be initialized,
3450 * which may result in suboptimal default settings (this is
3451 * important mainly for encoders, e.g. libx264).
3453 * @return An AVCodecContext filled with default values or NULL on failure.
3454 * @see avcodec_get_context_defaults
3456 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3459 * Set the fields of the given AVCodecContext to default values corresponding
3460 * to the given codec (defaults may be codec-dependent).
3462 * Do not call this function if a non-NULL codec has been passed
3463 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3464 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3465 * different codec on this AVCodecContext.
3467 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3470 * Get the AVClass for AVCodecContext. It can be used in combination with
3471 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3473 * @see av_opt_find().
3475 const AVClass *avcodec_get_class(void);
3478 * Get the AVClass for AVFrame. It can be used in combination with
3479 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3481 * @see av_opt_find().
3483 const AVClass *avcodec_get_frame_class(void);
3486 * Get the AVClass for AVSubtitleRect. It can be used in combination with
3487 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3489 * @see av_opt_find().
3491 const AVClass *avcodec_get_subtitle_rect_class(void);
3494 * Copy the settings of the source AVCodecContext into the destination
3495 * AVCodecContext. The resulting destination codec context will be
3496 * unopened, i.e. you are required to call avcodec_open2() before you
3497 * can use this AVCodecContext to decode/encode video/audio data.
3499 * @param dest target codec context, should be initialized with
3500 * avcodec_alloc_context3(), but otherwise uninitialized
3501 * @param src source codec context
3502 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3504 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3507 * Allocate an AVFrame and set its fields to default values. The resulting
3508 * struct can be deallocated by simply calling av_free().
3510 * @return An AVFrame filled with default values or NULL on failure.
3511 * @see avcodec_get_frame_defaults
3513 AVFrame *avcodec_alloc_frame(void);
3516 * Set the fields of the given AVFrame to default values.
3518 * @param pic The AVFrame of which the fields should be set to default values.
3520 void avcodec_get_frame_defaults(AVFrame *pic);
3522 #if FF_API_AVCODEC_OPEN
3524 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3525 * function the context has to be allocated.
3527 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3528 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3529 * retrieving a codec.
3531 * @warning This function is not thread safe!
3534 * avcodec_register_all();
3535 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3539 * context = avcodec_alloc_context3(codec);
3541 * if (avcodec_open(context, codec) < 0)
3545 * @param avctx The context which will be set up to use the given codec.
3546 * @param codec The codec to use within the context.
3547 * @return zero on success, a negative value on error
3548 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3550 * @deprecated use avcodec_open2
3552 attribute_deprecated
3553 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3557 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3558 * function the context has to be allocated with avcodec_alloc_context3().
3560 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3561 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3562 * retrieving a codec.
3564 * @warning This function is not thread safe!
3567 * avcodec_register_all();
3568 * av_dict_set(&opts, "b", "2.5M", 0);
3569 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3573 * context = avcodec_alloc_context3(codec);
3575 * if (avcodec_open2(context, codec, opts) < 0)
3579 * @param avctx The context to initialize.
3580 * @param codec The codec to open this context for. If a non-NULL codec has been
3581 * previously passed to avcodec_alloc_context3() or
3582 * avcodec_get_context_defaults3() for this context, then this
3583 * parameter MUST be either NULL or equal to the previously passed
3585 * @param options A dictionary filled with AVCodecContext and codec-private options.
3586 * On return this object will be filled with options that were not found.
3588 * @return zero on success, a negative value on error
3589 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3590 * av_dict_set(), av_opt_find().
3592 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3595 * Close a given AVCodecContext and free all the data associated with it
3596 * (but not the AVCodecContext itself).
3598 * Calling this function on an AVCodecContext that hasn't been opened will free
3599 * the codec-specific data allocated in avcodec_alloc_context3() /
3600 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3603 int avcodec_close(AVCodecContext *avctx);
3606 * Free all allocated data in the given subtitle struct.
3608 * @param sub AVSubtitle to free.
3610 void avsubtitle_free(AVSubtitle *sub);
3617 * @addtogroup lavc_packet
3622 * Default packet destructor.
3624 void av_destruct_packet(AVPacket *pkt);
3627 * Initialize optional fields of a packet with default values.
3629 * Note, this does not touch the data and size members, which have to be
3630 * initialized separately.
3634 void av_init_packet(AVPacket *pkt);
3637 * Allocate the payload of a packet and initialize its fields with
3641 * @param size wanted payload size
3642 * @return 0 if OK, AVERROR_xxx otherwise
3644 int av_new_packet(AVPacket *pkt, int size);
3647 * Reduce packet size, correctly zeroing padding
3650 * @param size new size
3652 void av_shrink_packet(AVPacket *pkt, int size);
3655 * Increase packet size, correctly zeroing padding
3658 * @param grow_by number of bytes by which to increase the size of the packet
3660 int av_grow_packet(AVPacket *pkt, int grow_by);
3663 * @warning This is a hack - the packet memory allocation stuff is broken. The
3664 * packet is allocated if it was not really allocated.
3666 int av_dup_packet(AVPacket *pkt);
3671 * @param pkt packet to free
3673 void av_free_packet(AVPacket *pkt);
3676 * Allocate new information of a packet.
3679 * @param type side information type
3680 * @param size side information size
3681 * @return pointer to fresh allocated data or NULL otherwise
3683 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3687 * Shrink the already allocated side data buffer
3690 * @param type side information type
3691 * @param size new side information size
3692 * @return 0 on success, < 0 on failure
3694 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3698 * Get side information from packet.
3701 * @param type desired side information type
3702 * @param size pointer for side information size to store (optional)
3703 * @return pointer to data if present or NULL otherwise
3705 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3708 int av_packet_merge_side_data(AVPacket *pkt);
3710 int av_packet_split_side_data(AVPacket *pkt);
3718 * @addtogroup lavc_decoding
3723 * Find a registered decoder with a matching codec ID.
3725 * @param id AVCodecID of the requested decoder
3726 * @return A decoder if one was found, NULL otherwise.
3728 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3731 * Find a registered decoder with the specified name.
3733 * @param name name of the requested decoder
3734 * @return A decoder if one was found, NULL otherwise.
3736 AVCodec *avcodec_find_decoder_by_name(const char *name);
3738 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3739 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3740 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3743 * Return the amount of padding in pixels which the get_buffer callback must
3744 * provide around the edge of the image for codecs which do not have the
3745 * CODEC_FLAG_EMU_EDGE flag.
3747 * @return Required padding in pixels.
3749 unsigned avcodec_get_edge_width(void);
3752 * Modify width and height values so that they will result in a memory
3753 * buffer that is acceptable for the codec if you do not use any horizontal
3756 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3757 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3758 * according to avcodec_get_edge_width() before.
3760 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3763 * Modify width and height values so that they will result in a memory
3764 * buffer that is acceptable for the codec if you also ensure that all
3765 * line sizes are a multiple of the respective linesize_align[i].
3767 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3768 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3769 * according to avcodec_get_edge_width() before.
3771 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3772 int linesize_align[AV_NUM_DATA_POINTERS]);
3774 #if FF_API_OLD_DECODE_AUDIO
3776 * Wrapper function which calls avcodec_decode_audio4.
3778 * @deprecated Use avcodec_decode_audio4 instead.
3780 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3781 * Some decoders may support multiple frames in a single AVPacket, such
3782 * decoders would then just decode the first frame. In this case,
3783 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3784 * the remaining data in order to decode the second frame etc.
3786 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3787 * decompressed frame size in bytes.
3789 * @warning You must set frame_size_ptr to the allocated size of the
3790 * output buffer before calling avcodec_decode_audio3().
3792 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3793 * the actual read bytes because some optimized bitstream readers read 32 or 64
3794 * bits at once and could read over the end.
3796 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3797 * no overreading happens for damaged MPEG streams.
3799 * @warning You must not provide a custom get_buffer() when using
3800 * avcodec_decode_audio3(). Doing so will override it with
3801 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3802 * which does allow the application to provide a custom get_buffer().
3804 * @note You might have to align the input buffer avpkt->data and output buffer
3805 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3806 * necessary at all, on others it won't work at all if not aligned and on others
3807 * it will work but it will have an impact on performance.
3809 * In practice, avpkt->data should have 4 byte alignment at minimum and
3810 * samples should be 16 byte aligned unless the CPU doesn't need it
3811 * (AltiVec and SSE do).
3813 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3814 * between input and output, these need to be fed with avpkt->data=NULL,
3815 * avpkt->size=0 at the end to return the remaining frames.
3817 * @param avctx the codec context
3818 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3819 * If the sample format is planar, each channel plane will
3820 * be the same size, with no padding between channels.
3821 * @param[in,out] frame_size_ptr the output buffer size in bytes
3822 * @param[in] avpkt The input AVPacket containing the input buffer.
3823 * You can create such packet with av_init_packet() and by then setting
3824 * data and size, some decoders might in addition need other fields.
3825 * All decoders are designed to use the least fields possible though.
3826 * @return On error a negative value is returned, otherwise the number of bytes
3827 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3829 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3830 int *frame_size_ptr,
3835 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3837 * Some decoders may support multiple frames in a single AVPacket. Such
3838 * decoders would then just decode the first frame. In this case,
3839 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3840 * the remaining data in order to decode the second frame, etc...
3841 * Even if no frames are returned, the packet needs to be fed to the decoder
3842 * with remaining data until it is completely consumed or an error occurs.
3844 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3845 * larger than the actual read bytes because some optimized bitstream
3846 * readers read 32 or 64 bits at once and could read over the end.
3848 * @note You might have to align the input buffer. The alignment requirements
3849 * depend on the CPU and the decoder.
3851 * @param avctx the codec context
3852 * @param[out] frame The AVFrame in which to store decoded audio samples.
3853 * Decoders request a buffer of a particular size by setting
3854 * AVFrame.nb_samples prior to calling get_buffer(). The
3855 * decoder may, however, only utilize part of the buffer by
3856 * setting AVFrame.nb_samples to a smaller value in the
3858 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3860 * @param[in] avpkt The input AVPacket containing the input buffer.
3861 * At least avpkt->data and avpkt->size should be set. Some
3862 * decoders might also require additional fields to be set.
3863 * @return A negative error code is returned if an error occurred during
3864 * decoding, otherwise the number of bytes consumed from the input
3865 * AVPacket is returned.
3867 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3868 int *got_frame_ptr, const AVPacket *avpkt);
3871 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3872 * Some decoders may support multiple frames in a single AVPacket, such
3873 * decoders would then just decode the first frame.
3875 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3876 * the actual read bytes because some optimized bitstream readers read 32 or 64
3877 * bits at once and could read over the end.
3879 * @warning The end of the input buffer buf should be set to 0 to ensure that
3880 * no overreading happens for damaged MPEG streams.
3882 * @note You might have to align the input buffer avpkt->data.
3883 * The alignment requirements depend on the CPU: on some CPUs it isn't
3884 * necessary at all, on others it won't work at all if not aligned and on others
3885 * it will work but it will have an impact on performance.
3887 * In practice, avpkt->data should have 4 byte alignment at minimum.
3889 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3890 * between input and output, these need to be fed with avpkt->data=NULL,
3891 * avpkt->size=0 at the end to return the remaining frames.
3893 * @param avctx the codec context
3894 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3895 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3896 * allocate memory for the actual bitmap.
3897 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3898 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3899 * decodes and the decoder tells the user once it does not need the data anymore,
3900 * the user app can at this point free/reuse/keep the memory as it sees fit.
3902 * @param[in] avpkt The input AVpacket containing the input buffer.
3903 * You can create such packet with av_init_packet() and by then setting
3904 * data and size, some decoders might in addition need other fields like
3905 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3907 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3908 * @return On error a negative value is returned, otherwise the number of bytes
3909 * used or zero if no frame could be decompressed.
3911 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3912 int *got_picture_ptr,
3913 const AVPacket *avpkt);
3916 * Decode a subtitle message.
3917 * Return a negative value on error, otherwise return the number of bytes used.
3918 * If no subtitle could be decompressed, got_sub_ptr is zero.
3919 * Otherwise, the subtitle is stored in *sub.
3920 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3921 * simplicity, because the performance difference is expect to be negligible
3922 * and reusing a get_buffer written for video codecs would probably perform badly
3923 * due to a potentially very different allocation pattern.
3925 * @param avctx the codec context
3926 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3927 freed with avsubtitle_free if *got_sub_ptr is set.
3928 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3929 * @param[in] avpkt The input AVPacket containing the input buffer.
3931 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3936 * @defgroup lavc_parsing Frame parsing
3940 typedef struct AVCodecParserContext {
3942 struct AVCodecParser *parser;
3943 int64_t frame_offset; /* offset of the current frame */
3944 int64_t cur_offset; /* current offset
3945 (incremented by each av_parser_parse()) */
3946 int64_t next_frame_offset; /* offset of the next frame */
3948 int pict_type; /* XXX: Put it back in AVCodecContext. */
3950 * This field is used for proper frame duration computation in lavf.
3951 * It signals, how much longer the frame duration of the current frame
3952 * is compared to normal frame duration.
3954 * frame_duration = (1 + repeat_pict) * time_base
3956 * It is used by codecs like H.264 to display telecined material.
3958 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3959 int64_t pts; /* pts of the current frame */
3960 int64_t dts; /* dts of the current frame */
3965 int fetch_timestamp;
3967 #define AV_PARSER_PTS_NB 4
3968 int cur_frame_start_index;
3969 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3970 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3971 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3974 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3975 #define PARSER_FLAG_ONCE 0x0002
3976 /// Set if the parser has a valid file offset
3977 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3978 #define PARSER_FLAG_USE_CODEC_TS 0x1000
3980 int64_t offset; ///< byte offset from starting packet start
3981 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3984 * Set by parser to 1 for key frames and 0 for non-key frames.
3985 * It is initialized to -1, so if the parser doesn't set this flag,
3986 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3992 * Time difference in stream time base units from the pts of this
3993 * packet to the point at which the output from the decoder has converged
3994 * independent from the availability of previous frames. That is, the
3995 * frames are virtually identical no matter if decoding started from
3996 * the very first frame or from this keyframe.
3997 * Is AV_NOPTS_VALUE if unknown.
3998 * This field is not the display duration of the current frame.
3999 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4002 * The purpose of this field is to allow seeking in streams that have no
4003 * keyframes in the conventional sense. It corresponds to the
4004 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4005 * essential for some types of subtitle streams to ensure that all
4006 * subtitles are correctly displayed after seeking.
4008 int64_t convergence_duration;
4010 // Timestamp generation support:
4012 * Synchronization point for start of timestamp generation.
4014 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4017 * For example, this corresponds to presence of H.264 buffering period
4023 * Offset of the current timestamp against last timestamp sync point in
4024 * units of AVCodecContext.time_base.
4026 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4027 * contain a valid timestamp offset.
4029 * Note that the timestamp of sync point has usually a nonzero
4030 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4031 * the next frame after timestamp sync point will be usually 1.
4033 * For example, this corresponds to H.264 cpb_removal_delay.
4035 int dts_ref_dts_delta;
4038 * Presentation delay of current frame in units of AVCodecContext.time_base.
4040 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4041 * contain valid non-negative timestamp delta (presentation time of a frame
4042 * must not lie in the past).
4044 * This delay represents the difference between decoding and presentation
4045 * time of the frame.
4047 * For example, this corresponds to H.264 dpb_output_delay.
4052 * Position of the packet in file.
4054 * Analogous to cur_frame_pts/dts
4056 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4059 * Byte position of currently parsed frame in stream.
4064 * Previous frame byte position.
4069 * Duration of the current frame.
4070 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4071 * For all other types, this is in units of AVCodecContext.time_base.
4074 } AVCodecParserContext;
4076 typedef struct AVCodecParser {
4077 int codec_ids[5]; /* several codec IDs are permitted */
4079 int (*parser_init)(AVCodecParserContext *s);
4080 int (*parser_parse)(AVCodecParserContext *s,
4081 AVCodecContext *avctx,
4082 const uint8_t **poutbuf, int *poutbuf_size,
4083 const uint8_t *buf, int buf_size);
4084 void (*parser_close)(AVCodecParserContext *s);
4085 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4086 struct AVCodecParser *next;
4089 AVCodecParser *av_parser_next(AVCodecParser *c);
4091 void av_register_codec_parser(AVCodecParser *parser);
4092 AVCodecParserContext *av_parser_init(int codec_id);
4097 * @param s parser context.
4098 * @param avctx codec context.
4099 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4100 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4101 * @param buf input buffer.
4102 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4103 * @param pts input presentation timestamp.
4104 * @param dts input decoding timestamp.
4105 * @param pos input byte position in stream.
4106 * @return the number of bytes of the input bitstream used.
4111 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4118 * decode_frame(data, size);
4122 int av_parser_parse2(AVCodecParserContext *s,
4123 AVCodecContext *avctx,
4124 uint8_t **poutbuf, int *poutbuf_size,
4125 const uint8_t *buf, int buf_size,
4126 int64_t pts, int64_t dts,
4129 int av_parser_change(AVCodecParserContext *s,
4130 AVCodecContext *avctx,
4131 uint8_t **poutbuf, int *poutbuf_size,
4132 const uint8_t *buf, int buf_size, int keyframe);
4133 void av_parser_close(AVCodecParserContext *s);
4141 * @addtogroup lavc_encoding
4146 * Find a registered encoder with a matching codec ID.
4148 * @param id AVCodecID of the requested encoder
4149 * @return An encoder if one was found, NULL otherwise.
4151 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4154 * Find a registered encoder with the specified name.
4156 * @param name name of the requested encoder
4157 * @return An encoder if one was found, NULL otherwise.
4159 AVCodec *avcodec_find_encoder_by_name(const char *name);
4161 #if FF_API_OLD_ENCODE_AUDIO
4163 * Encode an audio frame from samples into buf.
4165 * @deprecated Use avcodec_encode_audio2 instead.
4167 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
4168 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
4169 * will know how much space is needed because it depends on the value passed
4170 * in buf_size as described below. In that case a lower value can be used.
4172 * @param avctx the codec context
4173 * @param[out] buf the output buffer
4174 * @param[in] buf_size the output buffer size
4175 * @param[in] samples the input buffer containing the samples
4176 * The number of samples read from this buffer is frame_size*channels,
4177 * both of which are defined in avctx.
4178 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
4179 * samples read from samples is equal to:
4180 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
4181 * This also implies that av_get_bits_per_sample() must not return 0 for these
4183 * @return On error a negative value is returned, on success zero or the number
4184 * of bytes used to encode the data read from the input buffer.
4186 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
4187 uint8_t *buf, int buf_size,
4188 const short *samples);
4192 * Encode a frame of audio.
4194 * Takes input samples from frame and writes the next output packet, if
4195 * available, to avpkt. The output packet does not necessarily contain data for
4196 * the most recent frame, as encoders can delay, split, and combine input frames
4197 * internally as needed.
4199 * @param avctx codec context
4200 * @param avpkt output AVPacket.
4201 * The user can supply an output buffer by setting
4202 * avpkt->data and avpkt->size prior to calling the
4203 * function, but if the size of the user-provided data is not
4204 * large enough, encoding will fail. If avpkt->data and
4205 * avpkt->size are set, avpkt->destruct must also be set. All
4206 * other AVPacket fields will be reset by the encoder using
4207 * av_init_packet(). If avpkt->data is NULL, the encoder will
4208 * allocate it. The encoder will set avpkt->size to the size
4209 * of the output packet.
4211 * If this function fails or produces no output, avpkt will be
4212 * freed using av_free_packet() (i.e. avpkt->destruct will be
4213 * called to free the user supplied buffer).
4214 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4215 * May be NULL when flushing an encoder that has the
4216 * CODEC_CAP_DELAY capability set.
4217 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4218 * can have any number of samples.
4219 * If it is not set, frame->nb_samples must be equal to
4220 * avctx->frame_size for all frames except the last.
4221 * The final frame may be smaller than avctx->frame_size.
4222 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4223 * output packet is non-empty, and to 0 if it is
4224 * empty. If the function returns an error, the
4225 * packet can be assumed to be invalid, and the
4226 * value of got_packet_ptr is undefined and should
4228 * @return 0 on success, negative error code on failure
4230 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4231 const AVFrame *frame, int *got_packet_ptr);
4233 #if FF_API_OLD_ENCODE_VIDEO
4235 * @deprecated use avcodec_encode_video2() instead.
4237 * Encode a video frame from pict into buf.
4238 * The input picture should be
4239 * stored using a specific format, namely avctx.pix_fmt.
4241 * @param avctx the codec context
4242 * @param[out] buf the output buffer for the bitstream of encoded frame
4243 * @param[in] buf_size the size of the output buffer in bytes
4244 * @param[in] pict the input picture to encode
4245 * @return On error a negative value is returned, on success zero or the number
4246 * of bytes used from the output buffer.
4248 attribute_deprecated
4249 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4250 const AVFrame *pict);
4254 * Encode a frame of video.
4256 * Takes input raw video data from frame and writes the next output packet, if
4257 * available, to avpkt. The output packet does not necessarily contain data for
4258 * the most recent frame, as encoders can delay and reorder input frames
4259 * internally as needed.
4261 * @param avctx codec context
4262 * @param avpkt output AVPacket.
4263 * The user can supply an output buffer by setting
4264 * avpkt->data and avpkt->size prior to calling the
4265 * function, but if the size of the user-provided data is not
4266 * large enough, encoding will fail. All other AVPacket fields
4267 * will be reset by the encoder using av_init_packet(). If
4268 * avpkt->data is NULL, the encoder will allocate it.
4269 * The encoder will set avpkt->size to the size of the
4270 * output packet. The returned data (if any) belongs to the
4271 * caller, he is responsible for freeing it.
4273 * If this function fails or produces no output, avpkt will be
4274 * freed using av_free_packet() (i.e. avpkt->destruct will be
4275 * called to free the user supplied buffer).
4276 * @param[in] frame AVFrame containing the raw video data to be encoded.
4277 * May be NULL when flushing an encoder that has the
4278 * CODEC_CAP_DELAY capability set.
4279 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4280 * output packet is non-empty, and to 0 if it is
4281 * empty. If the function returns an error, the
4282 * packet can be assumed to be invalid, and the
4283 * value of got_packet_ptr is undefined and should
4285 * @return 0 on success, negative error code on failure
4287 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4288 const AVFrame *frame, int *got_packet_ptr);
4290 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4291 const AVSubtitle *sub);
4299 * @defgroup lavc_resample Audio resampling
4304 struct ReSampleContext;
4305 struct AVResampleContext;
4307 typedef struct ReSampleContext ReSampleContext;
4310 * Initialize audio resampling context.
4312 * @param output_channels number of output channels
4313 * @param input_channels number of input channels
4314 * @param output_rate output sample rate
4315 * @param input_rate input sample rate
4316 * @param sample_fmt_out requested output sample format
4317 * @param sample_fmt_in input sample format
4318 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
4319 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4320 * @param linear if 1 then the used FIR filter will be linearly interpolated
4321 between the 2 closest, if 0 the closest will be used
4322 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4323 * @return allocated ReSampleContext, NULL if error occurred
4325 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
4326 int output_rate, int input_rate,
4327 enum AVSampleFormat sample_fmt_out,
4328 enum AVSampleFormat sample_fmt_in,
4329 int filter_length, int log2_phase_count,
4330 int linear, double cutoff);
4332 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4335 * Free resample context.
4337 * @param s a non-NULL pointer to a resample context previously
4338 * created with av_audio_resample_init()
4340 void audio_resample_close(ReSampleContext *s);
4344 * Initialize an audio resampler.
4345 * Note, if either rate is not an integer then simply scale both rates up so they are.
4346 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4347 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4348 * @param linear If 1 then the used FIR filter will be linearly interpolated
4349 between the 2 closest, if 0 the closest will be used
4350 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4352 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4355 * Resample an array of samples using a previously configured context.
4356 * @param src an array of unconsumed samples
4357 * @param consumed the number of samples of src which have been consumed are returned here
4358 * @param src_size the number of unconsumed samples available
4359 * @param dst_size the amount of space in samples available in dst
4360 * @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.
4361 * @return the number of samples written in dst or -1 if an error occurred
4363 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4367 * Compensate samplerate/timestamp drift. The compensation is done by changing
4368 * the resampler parameters, so no audible clicks or similar distortions occur
4369 * @param compensation_distance distance in output samples over which the compensation should be performed
4370 * @param sample_delta number of output samples which should be output less
4372 * example: av_resample_compensate(c, 10, 500)
4373 * here instead of 510 samples only 500 samples would be output
4375 * note, due to rounding the actual compensation might be slightly different,
4376 * especially if the compensation_distance is large and the in_rate used during init is small
4378 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4379 void av_resample_close(struct AVResampleContext *c);
4386 * @addtogroup lavc_picture
4391 * Allocate memory for a picture. Call avpicture_free() to free it.
4393 * @see avpicture_fill()
4395 * @param picture the picture to be filled in
4396 * @param pix_fmt the format of the picture
4397 * @param width the width of the picture
4398 * @param height the height of the picture
4399 * @return zero if successful, a negative value if not
4401 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
4404 * Free a picture previously allocated by avpicture_alloc().
4405 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4408 * @param picture the AVPicture to be freed
4410 void avpicture_free(AVPicture *picture);
4413 * Fill in the AVPicture fields, always assume a linesize alignment of
4416 * @see av_image_fill_arrays()
4418 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4419 enum PixelFormat pix_fmt, int width, int height);
4422 * Copy pixel data from an AVPicture into a buffer, always assume a
4423 * linesize alignment of 1.
4425 * @see av_image_copy_to_buffer()
4427 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
4428 unsigned char *dest, int dest_size);
4431 * Calculate the size in bytes that a picture of the given width and height
4432 * would occupy if stored in the given picture format.
4433 * Always assume a linesize alignment of 1.
4435 * @see av_image_get_buffer_size().
4437 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
4440 * deinterlace - if not supported return -1
4442 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4443 enum PixelFormat pix_fmt, int width, int height);
4445 * Copy image src to dst. Wraps av_image_copy().
4447 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4448 enum PixelFormat pix_fmt, int width, int height);
4451 * Crop image top and left side.
4453 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4454 enum PixelFormat pix_fmt, int top_band, int left_band);
4459 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4460 int padtop, int padbottom, int padleft, int padright, int *color);
4467 * @defgroup lavc_misc Utility functions
4470 * Miscellaneous utility functions related to both encoding and decoding
4476 * @defgroup lavc_misc_pixfmt Pixel formats
4478 * Functions for working with pixel formats.
4482 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
4485 * Return a value representing the fourCC code associated to the
4486 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4489 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
4491 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4492 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4493 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4494 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4495 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4496 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4499 * Compute what kind of losses will occur when converting from one specific
4500 * pixel format to another.
4501 * When converting from one pixel format to another, information loss may occur.
4502 * For example, when converting from RGB24 to GRAY, the color information will
4503 * be lost. Similarly, other losses occur when converting from some formats to
4504 * other formats. These losses can involve loss of chroma, but also loss of
4505 * resolution, loss of color depth, loss due to the color space conversion, loss
4506 * of the alpha bits or loss due to color quantization.
4507 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4508 * which will occur when converting from one pixel format to another.
4510 * @param[in] dst_pix_fmt destination pixel format
4511 * @param[in] src_pix_fmt source pixel format
4512 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4513 * @return Combination of flags informing you what kind of losses will occur
4514 * (maximum loss for an invalid dst_pix_fmt).
4516 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
4519 #if FF_API_FIND_BEST_PIX_FMT
4521 * @deprecated use avcodec_find_best_pix_fmt_of_2() instead.
4523 * Find the best pixel format to convert to given a certain source pixel
4524 * format. When converting from one pixel format to another, information loss
4525 * may occur. For example, when converting from RGB24 to GRAY, the color
4526 * information will be lost. Similarly, other losses occur when converting from
4527 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
4528 * the given pixel formats should be used to suffer the least amount of loss.
4529 * The pixel formats from which it chooses one, are determined by the
4530 * pix_fmt_mask parameter.
4532 * Note, only the first 64 pixel formats will fit in pix_fmt_mask.
4535 * src_pix_fmt = PIX_FMT_YUV420P;
4536 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) | (1 << PIX_FMT_RGB24);
4537 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
4540 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
4541 * @param[in] src_pix_fmt source pixel format
4542 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4543 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4544 * @return The best pixel format to convert to or -1 if none was found.
4546 attribute_deprecated
4547 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
4548 int has_alpha, int *loss_ptr);
4549 #endif /* FF_API_FIND_BEST_PIX_FMT */
4552 * Find the best pixel format to convert to given a certain source pixel
4553 * format. When converting from one pixel format to another, information loss
4554 * may occur. For example, when converting from RGB24 to GRAY, the color
4555 * information will be lost. Similarly, other losses occur when converting from
4556 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
4557 * the given pixel formats should be used to suffer the least amount of loss.
4558 * The pixel formats from which it chooses one, are determined by the
4559 * pix_fmt_list parameter.
4562 * @param[in] pix_fmt_list PIX_FMT_NONE terminated array of pixel formats to choose from
4563 * @param[in] src_pix_fmt source pixel format
4564 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4565 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4566 * @return The best pixel format to convert to or -1 if none was found.
4568 enum PixelFormat avcodec_find_best_pix_fmt_of_list(enum PixelFormat *pix_fmt_list,
4569 enum PixelFormat src_pix_fmt,
4570 int has_alpha, int *loss_ptr);
4573 * Find the best pixel format to convert to given a certain source pixel
4574 * format and a selection of two destination pixel formats. When converting from
4575 * one pixel format to another, information loss may occur. For example, when converting
4576 * from RGB24 to GRAY, the color information will be lost. Similarly, other losses occur when
4577 * converting from some formats to other formats. avcodec_find_best_pix_fmt_of_2() selects which of
4578 * the given pixel formats should be used to suffer the least amount of loss.
4580 * If one of the destination formats is PIX_FMT_NONE the other pixel format (if valid) will be
4584 * src_pix_fmt = PIX_FMT_YUV420P;
4585 * dst_pix_fmt1= PIX_FMT_RGB24;
4586 * dst_pix_fmt2= PIX_FMT_GRAY8;
4587 * dst_pix_fmt3= PIX_FMT_RGB8;
4588 * loss= FF_LOSS_CHROMA; // don't care about chroma loss, so chroma loss will be ignored.
4589 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt1, dst_pix_fmt2, src_pix_fmt, alpha, &loss);
4590 * dst_pix_fmt = avcodec_find_best_pix_fmt_of_2(dst_pix_fmt, dst_pix_fmt3, src_pix_fmt, alpha, &loss);
4593 * @param[in] dst_pix_fmt1 One of the two destination pixel formats to choose from
4594 * @param[in] dst_pix_fmt2 The other of the two destination pixel formats to choose from
4595 * @param[in] src_pix_fmt Source pixel format
4596 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4597 * @param[in, out] loss_ptr Combination of loss flags. In: selects which of the losses to ignore, i.e.
4598 * NULL or value of zero means we care about all losses. Out: the loss
4599 * that occurs when converting from src to selected dst pixel format.
4600 * @return The best pixel format to convert to or -1 if none was found.
4602 enum PixelFormat avcodec_find_best_pix_fmt_of_2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
4603 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4605 attribute_deprecated
4606 #if AV_HAVE_INCOMPATIBLE_FORK_ABI
4607 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat *pix_fmt_list,
4608 enum PixelFormat src_pix_fmt,
4609 int has_alpha, int *loss_ptr);
4611 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat dst_pix_fmt1, enum PixelFormat dst_pix_fmt2,
4612 enum PixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
4616 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
4622 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4625 * Put a string representing the codec tag codec_tag in buf.
4627 * @param buf_size size in bytes of buf
4628 * @return the length of the string that would have been generated if
4629 * enough space had been available, excluding the trailing null
4631 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4633 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4636 * Return a name for the specified profile, if available.
4638 * @param codec the codec that is searched for the given profile
4639 * @param profile the profile value for which a name is requested
4640 * @return A name for the profile if found, NULL otherwise.
4642 const char *av_get_profile_name(const AVCodec *codec, int profile);
4644 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4645 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4646 //FIXME func typedef
4649 * Fill audio frame data and linesize.
4650 * AVFrame extended_data channel pointers are allocated if necessary for
4653 * @param frame the AVFrame
4654 * frame->nb_samples must be set prior to calling the
4655 * function. This function fills in frame->data,
4656 * frame->extended_data, frame->linesize[0].
4657 * @param nb_channels channel count
4658 * @param sample_fmt sample format
4659 * @param buf buffer to use for frame data
4660 * @param buf_size size of buffer
4661 * @param align plane size sample alignment (0 = default)
4662 * @return 0 on success, negative error code on failure
4664 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4665 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4666 int buf_size, int align);
4669 * Flush buffers, should be called when seeking or when switching to a different stream.
4671 void avcodec_flush_buffers(AVCodecContext *avctx);
4673 void avcodec_default_free_buffers(AVCodecContext *s);
4676 * Return codec bits per sample.
4678 * @param[in] codec_id the codec
4679 * @return Number of bits per sample or zero if unknown for the given codec.
4681 int av_get_bits_per_sample(enum AVCodecID codec_id);
4684 * Return the PCM codec associated with a sample format.
4685 * @param be endianness, 0 for little, 1 for big,
4686 * -1 (or anything else) for native
4687 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
4689 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
4692 * Return codec bits per sample.
4693 * Only return non-zero if the bits per sample is exactly correct, not an
4696 * @param[in] codec_id the codec
4697 * @return Number of bits per sample or zero if unknown for the given codec.
4699 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4702 * Return audio frame duration.
4704 * @param avctx codec context
4705 * @param frame_bytes size of the frame, or 0 if unknown
4706 * @return frame duration, in samples, if known. 0 if not able to
4709 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4712 typedef struct AVBitStreamFilterContext {
4714 struct AVBitStreamFilter *filter;
4715 AVCodecParserContext *parser;
4716 struct AVBitStreamFilterContext *next;
4717 } AVBitStreamFilterContext;
4720 typedef struct AVBitStreamFilter {
4723 int (*filter)(AVBitStreamFilterContext *bsfc,
4724 AVCodecContext *avctx, const char *args,
4725 uint8_t **poutbuf, int *poutbuf_size,
4726 const uint8_t *buf, int buf_size, int keyframe);
4727 void (*close)(AVBitStreamFilterContext *bsfc);
4728 struct AVBitStreamFilter *next;
4729 } AVBitStreamFilter;
4731 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4732 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4733 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4734 AVCodecContext *avctx, const char *args,
4735 uint8_t **poutbuf, int *poutbuf_size,
4736 const uint8_t *buf, int buf_size, int keyframe);
4737 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4739 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4744 * Reallocate the given block if it is not large enough, otherwise do nothing.
4748 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4751 * Allocate a buffer, reusing the given one if large enough.
4753 * Contrary to av_fast_realloc the current buffer contents might not be
4754 * preserved and on error the old buffer is freed, thus no special
4755 * handling to avoid memleaks is necessary.
4757 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4758 * @param size size of the buffer *ptr points to
4759 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4760 * *size 0 if an error occurred.
4762 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4765 * Same behaviour av_fast_malloc but the buffer has additional
4766 * FF_INPUT_PADDING_SIZE at the end which will will always be 0.
4768 * In addition the whole buffer will initially and after resizes
4769 * be 0-initialized so that no uninitialized data will ever appear.
4771 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4774 * Same behaviour av_fast_padded_malloc except that buffer will always
4775 * be 0-initialized after call.
4777 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
4780 * Encode extradata length to a buffer. Used by xiph codecs.
4782 * @param s buffer to write to; must be at least (v/255+1) bytes long
4783 * @param v size of extradata in bytes
4784 * @return number of bytes written to the buffer.
4786 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4789 * Log a generic warning message about a missing feature. This function is
4790 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4791 * only, and would normally not be used by applications.
4792 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4793 * a pointer to an AVClass struct
4794 * @param[in] feature string containing the name of the missing feature
4795 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4796 * If want_sample is non-zero, additional verbage will be added to the log
4797 * message which tells the user how to report samples to the development
4800 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4803 * Log a generic warning message asking for a sample. This function is
4804 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4805 * only, and would normally not be used by applications.
4806 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4807 * a pointer to an AVClass struct
4808 * @param[in] msg string containing an optional message, or NULL if no message
4810 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4813 * Register the hardware accelerator hwaccel.
4815 void av_register_hwaccel(AVHWAccel *hwaccel);
4818 * If hwaccel is NULL, returns the first registered hardware accelerator,
4819 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4820 * after hwaccel, or NULL if hwaccel is the last one.
4822 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4826 * Lock operation used by lockmgr
4829 AV_LOCK_CREATE, ///< Create a mutex
4830 AV_LOCK_OBTAIN, ///< Lock the mutex
4831 AV_LOCK_RELEASE, ///< Unlock the mutex
4832 AV_LOCK_DESTROY, ///< Free mutex resources
4836 * Register a user provided lock manager supporting the operations
4837 * specified by AVLockOp. mutex points to a (void *) where the
4838 * lockmgr should store/get a pointer to a user allocated mutex. It's
4839 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4841 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4842 * callback during the call to av_lockmgr_register().
4843 * Thus, the application must be prepared to handle that.
4844 * If cb is set to NULL the lockmgr will be unregistered.
4845 * Also note that during unregistration the previously registered
4846 * lockmgr callback may also be invoked.
4848 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4851 * Get the type of the given codec.
4853 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4856 * Get the name of a codec.
4857 * @return a static string identifying the codec; never NULL
4859 const char *avcodec_get_name(enum AVCodecID id);
4862 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4863 * with no corresponding avcodec_close()), 0 otherwise.
4865 int avcodec_is_open(AVCodecContext *s);
4868 * @return a non-zero number if codec is an encoder, zero otherwise
4870 int av_codec_is_encoder(const AVCodec *codec);
4873 * @return a non-zero number if codec is a decoder, zero otherwise
4875 int av_codec_is_decoder(const AVCodec *codec);
4878 * @return descriptor for given codec ID or NULL if no descriptor exists.
4880 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4883 * Iterate over all codec descriptors known to libavcodec.
4885 * @param prev previous descriptor. NULL to get the first descriptor.
4887 * @return next descriptor or NULL after the last descriptor
4889 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4892 * @return codec descriptor with the given name or NULL if no such descriptor
4895 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4901 #endif /* AVCODEC_AVCODEC_H */