2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; 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"
38 #include "libavcodec/version.h"
41 * Identify the syntax and semantics of the bitstream.
42 * The principle is roughly:
43 * Two decoders with the same ID can decode the same streams.
44 * Two encoders with the same ID can encode compatible streams.
45 * There may be slight deviations from the principle due to implementation
48 * If you add a codec ID to this list, add it so that
49 * 1. no value of a existing codec ID changes (that would break ABI),
50 * 2. it is as close as possible to similar codecs.
57 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
58 CODEC_ID_MPEG2VIDEO_XVMC,
95 CODEC_ID_INTERPLAY_VIDEO,
107 CODEC_ID_TRUEMOTION1,
134 CODEC_ID_TRUEMOTION2,
151 CODEC_ID_DSICINVIDEO,
152 CODEC_ID_TIERTEXSEQVIDEO,
161 CODEC_ID_BETHSOFTVID,
179 CODEC_ID_MOTIONPIXELS,
197 CODEC_ID_IFF_BYTERUN1,
214 /* various PCM "codecs" */
215 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
216 CODEC_ID_PCM_S16LE= 0x10000,
232 CODEC_ID_PCM_S24DAUD,
234 CODEC_ID_PCM_S16LE_PLANAR,
244 /* various ADPCM codecs */
245 CODEC_ID_ADPCM_IMA_QT= 0x11000,
246 CODEC_ID_ADPCM_IMA_WAV,
247 CODEC_ID_ADPCM_IMA_DK3,
248 CODEC_ID_ADPCM_IMA_DK4,
249 CODEC_ID_ADPCM_IMA_WS,
250 CODEC_ID_ADPCM_IMA_SMJPEG,
259 CODEC_ID_ADPCM_YAMAHA,
260 CODEC_ID_ADPCM_SBPRO_4,
261 CODEC_ID_ADPCM_SBPRO_3,
262 CODEC_ID_ADPCM_SBPRO_2,
264 CODEC_ID_ADPCM_IMA_AMV,
265 CODEC_ID_ADPCM_EA_R1,
266 CODEC_ID_ADPCM_EA_R3,
267 CODEC_ID_ADPCM_EA_R2,
268 CODEC_ID_ADPCM_IMA_EA_SEAD,
269 CODEC_ID_ADPCM_IMA_EA_EACS,
270 CODEC_ID_ADPCM_EA_XAS,
271 CODEC_ID_ADPCM_EA_MAXIS_XA,
272 CODEC_ID_ADPCM_IMA_ISS,
276 CODEC_ID_AMR_NB= 0x12000,
279 /* RealAudio codecs*/
280 CODEC_ID_RA_144= 0x13000,
283 /* various DPCM codecs */
284 CODEC_ID_ROQ_DPCM= 0x14000,
285 CODEC_ID_INTERPLAY_DPCM,
290 CODEC_ID_MP2= 0x15000,
291 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
309 CODEC_ID_WESTWOOD_SND1,
310 CODEC_ID_GSM, ///< as in Berlin toast format
318 CODEC_ID_DSICINAUDIO,
322 CODEC_ID_GSM_MS, /* as found in WAV */
331 CODEC_ID_WMALOSSLESS,
340 CODEC_ID_BINKAUDIO_RDFT,
341 CODEC_ID_BINKAUDIO_DCT,
345 /* subtitle codecs */
346 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
347 CODEC_ID_DVD_SUBTITLE= 0x17000,
348 CODEC_ID_DVB_SUBTITLE,
349 CODEC_ID_TEXT, ///< raw UTF-8 text
353 CODEC_ID_HDMV_PGS_SUBTITLE,
354 CODEC_ID_DVB_TELETEXT,
357 /* other specific kind of codecs (generally used for attachments) */
358 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
359 CODEC_ID_TTF= 0x18000,
361 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
363 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
364 * stream (only used by libavformat) */
365 CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
368 #if FF_API_OLD_SAMPLE_FMT
369 #define SampleFormat AVSampleFormat
371 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
372 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
373 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
374 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
375 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
376 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
377 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
380 #if FF_API_OLD_AUDIOCONVERT
381 #include "libavutil/audioconvert.h"
383 /* Audio channel masks */
384 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
385 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
386 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
387 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
388 #define CH_BACK_LEFT AV_CH_BACK_LEFT
389 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
390 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
391 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
392 #define CH_BACK_CENTER AV_CH_BACK_CENTER
393 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
394 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
395 #define CH_TOP_CENTER AV_CH_TOP_CENTER
396 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
397 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
398 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
399 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
400 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
401 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
402 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
403 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
405 /** Channel mask value used for AVCodecContext.request_channel_layout
406 to indicate that the user requests the channel order of the decoder output
407 to be the native codec channel order. */
408 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
410 /* Audio channel convenience macros */
411 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
412 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
413 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
414 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
415 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
416 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
417 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
418 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
419 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
420 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
421 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
422 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
423 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
424 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
425 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
429 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
432 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
433 * This is mainly needed because some optimized bitstream readers read
434 * 32 or 64 bit at once and could read over the end.<br>
435 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
436 * MPEG bitstreams could cause overread and segfault.
438 #define FF_INPUT_BUFFER_PADDING_SIZE 8
441 * minimum encoding buffer size
442 * Used to avoid some checks during header writing.
444 #define FF_MIN_BUFFER_SIZE 16384
448 * motion estimation type.
451 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
455 ME_EPZS, ///< enhanced predictive zonal search
456 ME_X1, ///< reserved for experiments
457 ME_HEX, ///< hexagon based search
458 ME_UMH, ///< uneven multi-hexagon search
459 ME_ITER, ///< iterative search
460 ME_TESA, ///< transformed exhaustive search algorithm
464 /* We leave some space between them for extensions (drop some
465 * keyframes for intra-only or drop just some bidir frames). */
466 AVDISCARD_NONE =-16, ///< discard nothing
467 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
468 AVDISCARD_NONREF = 8, ///< discard all non reference
469 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
470 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
471 AVDISCARD_ALL = 48, ///< discard all
474 enum AVColorPrimaries{
475 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
476 AVCOL_PRI_UNSPECIFIED=2,
478 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
479 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
480 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
482 AVCOL_PRI_NB , ///< Not part of ABI
485 enum AVColorTransferCharacteristic{
486 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
487 AVCOL_TRC_UNSPECIFIED=2,
488 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
489 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
490 AVCOL_TRC_NB , ///< Not part of ABI
495 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
496 AVCOL_SPC_UNSPECIFIED=2,
498 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
499 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
500 AVCOL_SPC_SMPTE240M =7,
501 AVCOL_SPC_NB , ///< Not part of ABI
505 AVCOL_RANGE_UNSPECIFIED=0,
506 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
507 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
508 AVCOL_RANGE_NB , ///< Not part of ABI
512 * X X 3 4 X X are luma samples,
513 * 1 2 1-6 are possible chroma positions
514 * X X 5 6 X 0 is undefined/unknown position
516 enum AVChromaLocation{
517 AVCHROMA_LOC_UNSPECIFIED=0,
518 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
519 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
520 AVCHROMA_LOC_TOPLEFT =3, ///< DV
522 AVCHROMA_LOC_BOTTOMLEFT =5,
523 AVCHROMA_LOC_BOTTOM =6,
524 AVCHROMA_LOC_NB , ///< Not part of ABI
527 #if FF_API_FLAC_GLOBAL_OPTS
531 attribute_deprecated enum AVLPCType {
532 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
533 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
534 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
535 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
536 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
537 AV_LPC_TYPE_NB , ///< Not part of ABI
541 enum AVAudioServiceType {
542 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
543 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
544 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
545 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
546 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
547 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
548 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
549 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
550 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
551 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
554 typedef struct RcOverride{
557 int qscale; // If this is 0 then quality_factor will be used instead.
558 float quality_factor;
561 #define FF_MAX_B_FRAMES 16
564 These flags can be passed in AVCodecContext.flags before initialization.
565 Note: Not everything is supported yet.
568 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
569 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
570 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
571 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
572 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
573 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
575 * The parent program guarantees that the input for B-frames containing
576 * streams is not written to for at least s->max_b_frames+1 frames, if
577 * this is not set the input will be copied.
579 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
580 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
581 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
582 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
583 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
584 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
585 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
586 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
587 location instead of only at frame boundaries. */
588 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
589 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
590 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
591 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
592 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
593 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
594 /* Fx : Flag for h263+ extra options */
595 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
596 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
597 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
598 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
599 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
600 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
601 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
602 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
603 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
604 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
605 #define CODEC_FLAG_CLOSED_GOP 0x80000000
606 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
607 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
608 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
609 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
610 #if FF_API_X264_GLOBAL_OPTS
611 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
612 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
613 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
614 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
615 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
616 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
617 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
619 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
620 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
622 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
623 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
624 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
626 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
627 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
628 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
629 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
631 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
632 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
633 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
634 #if FF_API_X264_GLOBAL_OPTS
635 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
636 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
639 /* Unsupported options :
640 * Syntax Arithmetic coding (SAC)
641 * Reference Picture Selection
642 * Independent Segment Decoding */
644 /* codec capabilities */
646 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
648 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
649 * If not set, it might not use get_buffer() at all or use operations that
650 * assume the buffer was allocated by avcodec_default_get_buffer.
652 #define CODEC_CAP_DR1 0x0002
653 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
654 #define CODEC_CAP_PARSE_ONLY 0x0004
655 #define CODEC_CAP_TRUNCATED 0x0008
656 /* Codec can export data for HW decoding (XvMC). */
657 #define CODEC_CAP_HWACCEL 0x0010
659 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
660 * If this is not set, the codec is guaranteed to never be fed with NULL data.
662 #define CODEC_CAP_DELAY 0x0020
664 * Codec can be fed a final frame with a smaller size.
665 * This can be used to prevent truncation of the last audio samples.
667 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
669 * Codec can export data for HW decoding (VDPAU).
671 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
673 * Codec can output multiple frames per AVPacket
674 * Normally demuxers return one frame at a time, demuxers which do not do
675 * are connected to a parser to split what they return into proper frames.
676 * This flag is reserved to the very rare category of codecs which have a
677 * bitstream that cannot be split into frames without timeconsuming
678 * operations like full decoding. Demuxers carring such bitstreams thus
679 * may return multiple frames in a packet. This has many disadvantages like
680 * prohibiting stream copy in many cases thus it should only be considered
683 #define CODEC_CAP_SUBFRAMES 0x0100
685 * Codec is experimental and is thus avoided in favor of non experimental
688 #define CODEC_CAP_EXPERIMENTAL 0x0200
690 * Codec should fill in channel configuration and samplerate instead of container
692 #define CODEC_CAP_CHANNEL_CONF 0x0400
694 * Codec is able to deal with negative linesizes
696 #define CODEC_CAP_NEG_LINESIZES 0x0800
698 * Codec supports frame-level multithreading.
700 #define CODEC_CAP_FRAME_THREADS 0x1000
702 * Codec supports slice-based (or partition-based) multithreading.
704 #define CODEC_CAP_SLICE_THREADS 0x2000
706 //The following defines may change, don't expect compatibility if you use them.
707 #define MB_TYPE_INTRA4x4 0x0001
708 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
709 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
710 #define MB_TYPE_16x16 0x0008
711 #define MB_TYPE_16x8 0x0010
712 #define MB_TYPE_8x16 0x0020
713 #define MB_TYPE_8x8 0x0040
714 #define MB_TYPE_INTERLACED 0x0080
715 #define MB_TYPE_DIRECT2 0x0100 //FIXME
716 #define MB_TYPE_ACPRED 0x0200
717 #define MB_TYPE_GMC 0x0400
718 #define MB_TYPE_SKIP 0x0800
719 #define MB_TYPE_P0L0 0x1000
720 #define MB_TYPE_P1L0 0x2000
721 #define MB_TYPE_P0L1 0x4000
722 #define MB_TYPE_P1L1 0x8000
723 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
724 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
725 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
726 #define MB_TYPE_QUANT 0x00010000
727 #define MB_TYPE_CBP 0x00020000
728 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
732 * This specifies the area which should be displayed.
733 * Note there may be multiple such areas for one frame.
735 typedef struct AVPanScan{
738 * - encoding: Set by user.
739 * - decoding: Set by libavcodec.
744 * width and height in 1/16 pel
745 * - encoding: Set by user.
746 * - decoding: Set by libavcodec.
752 * position of the top left corner in 1/16 pel for up to 3 fields/frames
753 * - encoding: Set by user.
754 * - decoding: Set by libavcodec.
756 int16_t position[3][2];
759 #define FF_QSCALE_TYPE_MPEG1 0
760 #define FF_QSCALE_TYPE_MPEG2 1
761 #define FF_QSCALE_TYPE_H264 2
762 #define FF_QSCALE_TYPE_VP56 3
764 #define FF_BUFFER_TYPE_INTERNAL 1
765 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
766 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
767 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
769 #if FF_API_OLD_FF_PICT_TYPES
770 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
771 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
772 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
773 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
774 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
775 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
776 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
777 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
780 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
781 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
782 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
783 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
785 enum AVPacketSideDataType {
789 typedef struct AVPacket {
791 * Presentation timestamp in AVStream->time_base units; the time at which
792 * the decompressed packet will be presented to the user.
793 * Can be AV_NOPTS_VALUE if it is not stored in the file.
794 * pts MUST be larger or equal to dts as presentation cannot happen before
795 * decompression, unless one wants to view hex dumps. Some formats misuse
796 * the terms dts and pts/cts to mean something different. Such timestamps
797 * must be converted to true pts/dts before they are stored in AVPacket.
801 * Decompression timestamp in AVStream->time_base units; the time at which
802 * the packet is decompressed.
803 * Can be AV_NOPTS_VALUE if it is not stored in the file.
810 * A combination of AV_PKT_FLAG values
814 * Additional packet data that can be provided by the container.
815 * Packet can contain several types of side information.
820 enum AVPacketSideDataType type;
825 * Duration of this packet in AVStream->time_base units, 0 if unknown.
826 * Equals next_pts - this_pts in presentation order.
829 void (*destruct)(struct AVPacket *);
831 int64_t pos; ///< byte position in stream, -1 if unknown
834 * Time difference in AVStream->time_base units from the pts of this
835 * packet to the point at which the output from the decoder has converged
836 * independent from the availability of previous frames. That is, the
837 * frames are virtually identical no matter if decoding started from
838 * the very first frame or from this keyframe.
839 * Is AV_NOPTS_VALUE if unknown.
840 * This field is not the display duration of the current packet.
841 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
844 * The purpose of this field is to allow seeking in streams that have no
845 * keyframes in the conventional sense. It corresponds to the
846 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
847 * essential for some types of subtitle streams to ensure that all
848 * subtitles are correctly displayed after seeking.
850 int64_t convergence_duration;
852 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
853 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
857 * New fields can be added to the end of AVFRAME with minor version
858 * bumps. Removal, reordering and changes to existing fields require
859 * a major version bump.
860 * sizeof(AVFrame) must not be used outside libav*.
862 typedef struct AVFrame {
864 * pointer to the picture planes.
865 * This might be different from the first allocated byte
872 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
873 * This isn't used by libavcodec unless the default get/release_buffer() is used.
879 * 1 -> keyframe, 0-> not
880 * - encoding: Set by libavcodec.
881 * - decoding: Set by libavcodec.
886 * Picture type of the frame, see ?_TYPE below.
887 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
888 * - decoding: Set by libavcodec.
890 enum AVPictureType pict_type;
893 * presentation timestamp in time_base units (time when frame should be shown to user)
894 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
895 * - encoding: MUST be set by user.
896 * - decoding: Set by libavcodec.
901 * picture number in bitstream order
903 * - decoding: Set by libavcodec.
905 int coded_picture_number;
907 * picture number in display order
909 * - decoding: Set by libavcodec.
911 int display_picture_number;
914 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
915 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
916 * - decoding: Set by libavcodec.
921 * buffer age (1->was last buffer and dint change, 2->..., ...).
922 * Set to INT_MAX if the buffer has not been used yet.
924 * - decoding: MUST be set by get_buffer().
929 * is this picture used as reference
930 * The values for this are the same as the MpegEncContext.picture_structure
931 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
932 * Set to 4 for delayed, non-reference frames.
934 * - decoding: Set by libavcodec. (before get_buffer() call)).
941 * - decoding: Set by libavcodec.
943 int8_t *qscale_table;
947 * - decoding: Set by libavcodec.
952 * mbskip_table[mb]>=1 if MB didn't change
953 * stride= mb_width = (width+15)>>4
955 * - decoding: Set by libavcodec.
957 uint8_t *mbskip_table;
960 * motion vector table
963 * int mv_sample_log2= 4 - motion_subsample_log2;
964 * int mb_width= (width+15)>>4;
965 * int mv_stride= (mb_width << mv_sample_log2) + 1;
966 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
968 * - encoding: Set by user.
969 * - decoding: Set by libavcodec.
971 int16_t (*motion_val[2])[2];
974 * macroblock type table
975 * mb_type_base + mb_width + 2
976 * - encoding: Set by user.
977 * - decoding: Set by libavcodec.
982 * log2 of the size of the block which a single vector in motion_val represents:
983 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
985 * - decoding: Set by libavcodec.
987 uint8_t motion_subsample_log2;
990 * for some private data of the user
992 * - decoding: Set by user.
998 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1004 * type of the buffer (to keep track of who has to deallocate data[*])
1005 * - encoding: Set by the one who allocates it.
1006 * - decoding: Set by the one who allocates it.
1007 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1012 * When decoding, this signals how much the picture must be delayed.
1013 * extra_delay = repeat_pict / (2*fps)
1014 * - encoding: unused
1015 * - decoding: Set by libavcodec.
1025 * The content of the picture is interlaced.
1026 * - encoding: Set by user.
1027 * - decoding: Set by libavcodec. (default 0)
1029 int interlaced_frame;
1032 * If the content is interlaced, is top field displayed first.
1033 * - encoding: Set by user.
1034 * - decoding: Set by libavcodec.
1036 int top_field_first;
1040 * - encoding: Set by user.
1041 * - decoding: Set by libavcodec.
1043 AVPanScan *pan_scan;
1046 * Tell user application that palette has changed from previous frame.
1047 * - encoding: ??? (no palette-enabled encoder yet)
1048 * - decoding: Set by libavcodec. (default 0).
1050 int palette_has_changed;
1053 * codec suggestion on buffer type if != 0
1054 * - encoding: unused
1055 * - decoding: Set by libavcodec. (before get_buffer() call)).
1061 * - encoding: unused
1062 * - decoding: Set by libavcodec.
1067 * motion reference frame index
1068 * the order in which these are stored can depend on the codec.
1069 * - encoding: Set by user.
1070 * - decoding: Set by libavcodec.
1072 int8_t *ref_index[2];
1075 * reordered opaque 64bit (generally an integer or a double precision float
1076 * PTS but can be anything).
1077 * The user sets AVCodecContext.reordered_opaque to represent the input at
1079 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1080 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1081 * @deprecated in favor of pkt_pts
1082 * - encoding: unused
1083 * - decoding: Read by user.
1085 int64_t reordered_opaque;
1088 * hardware accelerator private data (Libav-allocated)
1089 * - encoding: unused
1090 * - decoding: Set by libavcodec
1092 void *hwaccel_picture_private;
1095 * reordered pts from the last AVPacket that has been input into the decoder
1096 * - encoding: unused
1097 * - decoding: Read by user.
1102 * dts from the last AVPacket that has been input into the decoder
1103 * - encoding: unused
1104 * - decoding: Read by user.
1109 * the AVCodecContext which ff_thread_get_buffer() was last called on
1110 * - encoding: Set by libavcodec.
1111 * - decoding: Set by libavcodec.
1113 struct AVCodecContext *owner;
1116 * used by multithreading to store frame-specific info
1117 * - encoding: Set by libavcodec.
1118 * - decoding: Set by libavcodec.
1120 void *thread_opaque;
1124 * main external API structure.
1125 * New fields can be added to the end with minor version bumps.
1126 * Removal, reordering and changes to existing fields require a major
1128 * sizeof(AVCodecContext) must not be used outside libav*.
1130 typedef struct AVCodecContext {
1132 * information on struct for av_log
1133 * - set by avcodec_alloc_context
1135 const AVClass *av_class;
1137 * the average bitrate
1138 * - encoding: Set by user; unused for constant quantizer encoding.
1139 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1144 * number of bits the bitstream is allowed to diverge from the reference.
1145 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1146 * - encoding: Set by user; unused for constant quantizer encoding.
1147 * - decoding: unused
1149 int bit_rate_tolerance;
1153 * - encoding: Set by user.
1154 * - decoding: Set by user.
1159 * Some codecs need additional format info. It is stored here.
1160 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1161 * specific codec MUST set it correctly otherwise stream copy breaks.
1162 * In general use of this field by muxers is not recommanded.
1163 * - encoding: Set by libavcodec.
1164 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1169 * Motion estimation algorithm used for video coding.
1170 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1171 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1172 * - encoding: MUST be set by user.
1173 * - decoding: unused
1178 * some codecs need / can use extradata like Huffman tables.
1179 * mjpeg: Huffman tables
1180 * rv10: additional flags
1181 * mpeg4: global headers (they can be in the bitstream or here)
1182 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1183 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1184 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1185 * - encoding: Set/allocated/freed by libavcodec.
1186 * - decoding: Set/allocated/freed by user.
1192 * This is the fundamental unit of time (in seconds) in terms
1193 * of which frame timestamps are represented. For fixed-fps content,
1194 * timebase should be 1/framerate and timestamp increments should be
1196 * - encoding: MUST be set by user.
1197 * - decoding: Set by libavcodec.
1199 AVRational time_base;
1203 * picture width / height.
1204 * - encoding: MUST be set by user.
1205 * - decoding: Set by libavcodec.
1206 * Note: For compatibility it is possible to set this instead of
1207 * coded_width/height before decoding.
1211 #define FF_ASPECT_EXTENDED 15
1214 * the number of pictures in a group of pictures, or 0 for intra_only
1215 * - encoding: Set by user.
1216 * - decoding: unused
1221 * Pixel format, see PIX_FMT_xxx.
1222 * May be set by the demuxer if known from headers.
1223 * May be overriden by the decoder if it knows better.
1224 * - encoding: Set by user.
1225 * - decoding: Set by user if known, overridden by libavcodec if known
1227 enum PixelFormat pix_fmt;
1230 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1231 * decoder to draw a horizontal band. It improves cache usage. Not
1232 * all codecs can do that. You must check the codec capabilities
1234 * When multithreading is used, it may be called from multiple threads
1235 * at the same time; threads might draw different parts of the same AVFrame,
1236 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1238 * The function is also used by hardware acceleration APIs.
1239 * It is called at least once during frame decoding to pass
1240 * the data needed for hardware render.
1241 * In that mode instead of pixel data, AVFrame points to
1242 * a structure specific to the acceleration API. The application
1243 * reads the structure and can change some fields to indicate progress
1245 * - encoding: unused
1246 * - decoding: Set by user.
1247 * @param height the height of the slice
1248 * @param y the y position of the slice
1249 * @param type 1->top field, 2->bottom field, 3->frame
1250 * @param offset offset into the AVFrame.data from which the slice should be read
1252 void (*draw_horiz_band)(struct AVCodecContext *s,
1253 const AVFrame *src, int offset[4],
1254 int y, int type, int height);
1257 int sample_rate; ///< samples per second
1258 int channels; ///< number of audio channels
1261 * audio sample format
1262 * - encoding: Set by user.
1263 * - decoding: Set by libavcodec.
1265 enum AVSampleFormat sample_fmt; ///< sample format
1267 /* The following data should not be initialized. */
1269 * Samples per packet, initialized when calling 'init'.
1272 int frame_number; ///< audio or video frame number
1275 * Number of frames the decoded output will be delayed relative to
1276 * the encoded input.
1277 * - encoding: Set by libavcodec.
1278 * - decoding: unused
1282 /* - encoding parameters */
1283 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1284 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1288 * - encoding: Set by user.
1289 * - decoding: unused
1295 * - encoding: Set by user.
1296 * - decoding: unused
1301 * maximum quantizer difference between frames
1302 * - encoding: Set by user.
1303 * - decoding: unused
1308 * maximum number of B-frames between non-B-frames
1309 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1310 * - encoding: Set by user.
1311 * - decoding: unused
1316 * qscale factor between IP and B-frames
1317 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1318 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1319 * - encoding: Set by user.
1320 * - decoding: unused
1322 float b_quant_factor;
1324 /** obsolete FIXME remove */
1326 #define FF_RC_STRATEGY_XVID 1
1328 int b_frame_strategy;
1330 struct AVCodec *codec;
1334 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1335 /* do its best to deliver a chunk with size */
1336 /* below rtp_payload_size, the chunk will start */
1337 /* with a start code on some codecs like H.263. */
1338 /* This doesn't take account of any particular */
1339 /* headers inside the transmitted RTP payload. */
1342 /* The RTP callback: This function is called */
1343 /* every time the encoder has a packet to send. */
1344 /* It depends on the encoder if the data starts */
1345 /* with a Start Code (it should). H.263 does. */
1346 /* mb_nb contains the number of macroblocks */
1347 /* encoded in the RTP payload. */
1348 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1350 /* statistics, used for 2-pass encoding */
1361 * number of bits used for the previously encoded frame
1362 * - encoding: Set by libavcodec.
1363 * - decoding: unused
1368 * Private data of the user, can be used to carry app specific stuff.
1369 * - encoding: Set by user.
1370 * - decoding: Set by user.
1374 char codec_name[32];
1375 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1376 enum CodecID codec_id; /* see CODEC_ID_xxx */
1379 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1380 * This is used to work around some encoder bugs.
1381 * A demuxer should set this to what is stored in the field used to identify the codec.
1382 * If there are multiple such fields in a container then the demuxer should choose the one
1383 * which maximizes the information about the used codec.
1384 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1385 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1386 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1388 * - encoding: Set by user, if not then the default based on codec_id will be used.
1389 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1391 unsigned int codec_tag;
1394 * Work around bugs in encoders which sometimes cannot be detected automatically.
1395 * - encoding: Set by user
1396 * - decoding: Set by user
1398 int workaround_bugs;
1399 #define FF_BUG_AUTODETECT 1 ///< autodetection
1400 #define FF_BUG_OLD_MSMPEG4 2
1401 #define FF_BUG_XVID_ILACE 4
1402 #define FF_BUG_UMP4 8
1403 #define FF_BUG_NO_PADDING 16
1404 #define FF_BUG_AMV 32
1405 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1406 #define FF_BUG_QPEL_CHROMA 64
1407 #define FF_BUG_STD_QPEL 128
1408 #define FF_BUG_QPEL_CHROMA2 256
1409 #define FF_BUG_DIRECT_BLOCKSIZE 512
1410 #define FF_BUG_EDGE 1024
1411 #define FF_BUG_HPEL_CHROMA 2048
1412 #define FF_BUG_DC_CLIP 4096
1413 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1414 #define FF_BUG_TRUNCATED 16384
1415 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1418 * luma single coefficient elimination threshold
1419 * - encoding: Set by user.
1420 * - decoding: unused
1422 int luma_elim_threshold;
1425 * chroma single coeff elimination threshold
1426 * - encoding: Set by user.
1427 * - decoding: unused
1429 int chroma_elim_threshold;
1432 * strictly follow the standard (MPEG4, ...).
1433 * - encoding: Set by user.
1434 * - decoding: Set by user.
1435 * Setting this to STRICT or higher means the encoder and decoder will
1436 * generally do stupid things, whereas setting it to unofficial or lower
1437 * will mean the encoder might produce output that is not supported by all
1438 * spec-compliant decoders. Decoders don't differentiate between normal,
1439 * unofficial and experimental (that is, they always try to decode things
1440 * when they can) unless they are explicitly asked to behave stupidly
1441 * (=strictly conform to the specs)
1443 int strict_std_compliance;
1444 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1445 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1446 #define FF_COMPLIANCE_NORMAL 0
1447 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1448 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1451 * qscale offset between IP and B-frames
1452 * - encoding: Set by user.
1453 * - decoding: unused
1455 float b_quant_offset;
1458 * Error recognition; higher values will detect more errors but may
1459 * misdetect some more or less valid parts as errors.
1460 * - encoding: unused
1461 * - decoding: Set by user.
1463 int error_recognition;
1464 #define FF_ER_CAREFUL 1
1465 #define FF_ER_COMPLIANT 2
1466 #define FF_ER_AGGRESSIVE 3
1467 #if FF_API_VERY_AGGRESSIVE
1468 #define FF_ER_VERY_AGGRESSIVE 4
1469 #define FF_ER_EXPLODE 5
1471 #define FF_ER_EXPLODE 4
1472 #endif /* FF_API_VERY_AGGRESSIVE */
1475 * Called at the beginning of each frame to get a buffer for it.
1476 * If pic.reference is set then the frame will be read later by libavcodec.
1477 * avcodec_align_dimensions2() should be used to find the required width and
1478 * height, as they normally need to be rounded up to the next multiple of 16.
1479 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1480 * avcodec_default_get_buffer() instead of providing buffers allocated by
1482 * If frame multithreading is used and thread_safe_callbacks is set,
1483 * it may be called from a different thread, but not from more than one at once.
1484 * Does not need to be reentrant.
1485 * - encoding: unused
1486 * - decoding: Set by libavcodec, user can override.
1488 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1491 * Called to release buffers which were allocated with get_buffer.
1492 * A released buffer can be reused in get_buffer().
1493 * pic.data[*] must be set to NULL.
1494 * May be called from a different thread if frame multithreading is used,
1495 * but not by more than one thread at once, so does not need to be reentrant.
1496 * - encoding: unused
1497 * - decoding: Set by libavcodec, user can override.
1499 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1502 * Size of the frame reordering buffer in the decoder.
1503 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1504 * - encoding: Set by libavcodec.
1505 * - decoding: Set by libavcodec.
1510 * number of bytes per packet if constant and known or 0
1511 * Used by some WAV based audio codecs.
1515 int parse_only; /* - decoding only: If true, only parsing is done
1516 (function avcodec_parse_frame()). The frame
1517 data is returned. Only MPEG codecs support this now. */
1520 * 0-> h263 quant 1-> mpeg quant
1521 * - encoding: Set by user.
1522 * - decoding: unused
1527 * pass1 encoding statistics output buffer
1528 * - encoding: Set by libavcodec.
1529 * - decoding: unused
1534 * pass2 encoding statistics input buffer
1535 * Concatenated stuff from stats_out of pass1 should be placed here.
1536 * - encoding: Allocated/set/freed by user.
1537 * - decoding: unused
1542 * ratecontrol qmin qmax limiting method
1543 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1544 * - encoding: Set by user.
1545 * - decoding: unused
1553 * ratecontrol override, see RcOverride
1554 * - encoding: Allocated/set/freed by user.
1555 * - decoding: unused
1557 RcOverride *rc_override;
1558 int rc_override_count;
1561 * rate control equation
1562 * - encoding: Set by user
1563 * - decoding: unused
1569 * - encoding: Set by user.
1570 * - decoding: unused
1576 * - encoding: Set by user.
1577 * - decoding: unused
1582 * decoder bitstream buffer size
1583 * - encoding: Set by user.
1584 * - decoding: unused
1587 float rc_buffer_aggressivity;
1590 * qscale factor between P and I-frames
1591 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1592 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1593 * - encoding: Set by user.
1594 * - decoding: unused
1596 float i_quant_factor;
1599 * qscale offset between P and I-frames
1600 * - encoding: Set by user.
1601 * - decoding: unused
1603 float i_quant_offset;
1606 * initial complexity for pass1 ratecontrol
1607 * - encoding: Set by user.
1608 * - decoding: unused
1610 float rc_initial_cplx;
1613 * DCT algorithm, see FF_DCT_* below
1614 * - encoding: Set by user.
1615 * - decoding: unused
1618 #define FF_DCT_AUTO 0
1619 #define FF_DCT_FASTINT 1
1620 #define FF_DCT_INT 2
1621 #define FF_DCT_MMX 3
1622 #define FF_DCT_MLIB 4
1623 #define FF_DCT_ALTIVEC 5
1624 #define FF_DCT_FAAN 6
1627 * luminance masking (0-> disabled)
1628 * - encoding: Set by user.
1629 * - decoding: unused
1634 * temporary complexity masking (0-> disabled)
1635 * - encoding: Set by user.
1636 * - decoding: unused
1638 float temporal_cplx_masking;
1641 * spatial complexity masking (0-> disabled)
1642 * - encoding: Set by user.
1643 * - decoding: unused
1645 float spatial_cplx_masking;
1648 * p block masking (0-> disabled)
1649 * - encoding: Set by user.
1650 * - decoding: unused
1655 * darkness masking (0-> disabled)
1656 * - encoding: Set by user.
1657 * - decoding: unused
1662 * IDCT algorithm, see FF_IDCT_* below.
1663 * - encoding: Set by user.
1664 * - decoding: Set by user.
1667 #define FF_IDCT_AUTO 0
1668 #define FF_IDCT_INT 1
1669 #define FF_IDCT_SIMPLE 2
1670 #define FF_IDCT_SIMPLEMMX 3
1671 #define FF_IDCT_LIBMPEG2MMX 4
1672 #define FF_IDCT_PS2 5
1673 #define FF_IDCT_MLIB 6
1674 #define FF_IDCT_ARM 7
1675 #define FF_IDCT_ALTIVEC 8
1676 #define FF_IDCT_SH4 9
1677 #define FF_IDCT_SIMPLEARM 10
1678 #define FF_IDCT_H264 11
1679 #define FF_IDCT_VP3 12
1680 #define FF_IDCT_IPP 13
1681 #define FF_IDCT_XVIDMMX 14
1682 #define FF_IDCT_CAVS 15
1683 #define FF_IDCT_SIMPLEARMV5TE 16
1684 #define FF_IDCT_SIMPLEARMV6 17
1685 #define FF_IDCT_SIMPLEVIS 18
1686 #define FF_IDCT_WMV2 19
1687 #define FF_IDCT_FAAN 20
1688 #define FF_IDCT_EA 21
1689 #define FF_IDCT_SIMPLENEON 22
1690 #define FF_IDCT_SIMPLEALPHA 23
1691 #define FF_IDCT_BINK 24
1695 * - encoding: Set by libavcodec.
1696 * - decoding: Set by user (or 0).
1700 * slice offsets in the frame in bytes
1701 * - encoding: Set/allocated by libavcodec.
1702 * - decoding: Set/allocated by user (or NULL).
1707 * error concealment flags
1708 * - encoding: unused
1709 * - decoding: Set by user.
1711 int error_concealment;
1712 #define FF_EC_GUESS_MVS 1
1713 #define FF_EC_DEBLOCK 2
1716 * dsp_mask could be add used to disable unwanted CPU features
1717 * CPU features (i.e. MMX, SSE. ...)
1719 * With the FORCE flag you may instead enable given CPU features.
1720 * (Dangerous: Usable in case of misdetection, improper usage however will
1721 * result into program crash.)
1726 * bits per sample/pixel from the demuxer (needed for huffyuv).
1727 * - encoding: Set by libavcodec.
1728 * - decoding: Set by user.
1730 int bits_per_coded_sample;
1733 * prediction method (needed for huffyuv)
1734 * - encoding: Set by user.
1735 * - decoding: unused
1737 int prediction_method;
1738 #define FF_PRED_LEFT 0
1739 #define FF_PRED_PLANE 1
1740 #define FF_PRED_MEDIAN 2
1743 * sample aspect ratio (0 if unknown)
1744 * That is the width of a pixel divided by the height of the pixel.
1745 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1746 * - encoding: Set by user.
1747 * - decoding: Set by libavcodec.
1749 AVRational sample_aspect_ratio;
1752 * the picture in the bitstream
1753 * - encoding: Set by libavcodec.
1754 * - decoding: Set by libavcodec.
1756 AVFrame *coded_frame;
1760 * - encoding: Set by user.
1761 * - decoding: Set by user.
1764 #define FF_DEBUG_PICT_INFO 1
1765 #define FF_DEBUG_RC 2
1766 #define FF_DEBUG_BITSTREAM 4
1767 #define FF_DEBUG_MB_TYPE 8
1768 #define FF_DEBUG_QP 16
1769 #define FF_DEBUG_MV 32
1770 #define FF_DEBUG_DCT_COEFF 0x00000040
1771 #define FF_DEBUG_SKIP 0x00000080
1772 #define FF_DEBUG_STARTCODE 0x00000100
1773 #define FF_DEBUG_PTS 0x00000200
1774 #define FF_DEBUG_ER 0x00000400
1775 #define FF_DEBUG_MMCO 0x00000800
1776 #define FF_DEBUG_BUGS 0x00001000
1777 #define FF_DEBUG_VIS_QP 0x00002000
1778 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1779 #define FF_DEBUG_BUFFERS 0x00008000
1780 #define FF_DEBUG_THREADS 0x00010000
1784 * - encoding: Set by user.
1785 * - decoding: Set by user.
1788 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1789 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1790 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1794 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1795 * - decoding: unused
1800 * motion estimation comparison function
1801 * - encoding: Set by user.
1802 * - decoding: unused
1806 * subpixel motion estimation comparison function
1807 * - encoding: Set by user.
1808 * - decoding: unused
1812 * macroblock comparison function (not supported yet)
1813 * - encoding: Set by user.
1814 * - decoding: unused
1818 * interlaced DCT comparison function
1819 * - encoding: Set by user.
1820 * - decoding: unused
1823 #define FF_CMP_SAD 0
1824 #define FF_CMP_SSE 1
1825 #define FF_CMP_SATD 2
1826 #define FF_CMP_DCT 3
1827 #define FF_CMP_PSNR 4
1828 #define FF_CMP_BIT 5
1830 #define FF_CMP_ZERO 7
1831 #define FF_CMP_VSAD 8
1832 #define FF_CMP_VSSE 9
1833 #define FF_CMP_NSSE 10
1834 #define FF_CMP_W53 11
1835 #define FF_CMP_W97 12
1836 #define FF_CMP_DCTMAX 13
1837 #define FF_CMP_DCT264 14
1838 #define FF_CMP_CHROMA 256
1841 * ME diamond size & shape
1842 * - encoding: Set by user.
1843 * - decoding: unused
1848 * amount of previous MV predictors (2a+1 x 2a+1 square)
1849 * - encoding: Set by user.
1850 * - decoding: unused
1852 int last_predictor_count;
1855 * prepass for motion estimation
1856 * - encoding: Set by user.
1857 * - decoding: unused
1862 * motion estimation prepass comparison function
1863 * - encoding: Set by user.
1864 * - decoding: unused
1869 * ME prepass diamond size & shape
1870 * - encoding: Set by user.
1871 * - decoding: unused
1877 * - encoding: Set by user.
1878 * - decoding: unused
1880 int me_subpel_quality;
1883 * callback to negotiate the pixelFormat
1884 * @param fmt is the list of formats which are supported by the codec,
1885 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1886 * The first is always the native one.
1887 * @return the chosen format
1888 * - encoding: unused
1889 * - decoding: Set by user, if not set the native format will be chosen.
1891 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1894 * DTG active format information (additional aspect ratio
1895 * information only used in DVB MPEG-2 transport streams)
1898 * - encoding: unused
1899 * - decoding: Set by decoder.
1901 int dtg_active_format;
1902 #define FF_DTG_AFD_SAME 8
1903 #define FF_DTG_AFD_4_3 9
1904 #define FF_DTG_AFD_16_9 10
1905 #define FF_DTG_AFD_14_9 11
1906 #define FF_DTG_AFD_4_3_SP_14_9 13
1907 #define FF_DTG_AFD_16_9_SP_14_9 14
1908 #define FF_DTG_AFD_SP_4_3 15
1911 * maximum motion estimation search range in subpel units
1912 * If 0 then no limit.
1914 * - encoding: Set by user.
1915 * - decoding: unused
1920 * intra quantizer bias
1921 * - encoding: Set by user.
1922 * - decoding: unused
1924 int intra_quant_bias;
1925 #define FF_DEFAULT_QUANT_BIAS 999999
1928 * inter quantizer bias
1929 * - encoding: Set by user.
1930 * - decoding: unused
1932 int inter_quant_bias;
1936 * - encoding: unused
1937 * - decoding: Which clrtable should be used for 8bit RGB images.
1938 * Tables have to be stored somewhere. FIXME
1943 * internal_buffer count
1944 * Don't touch, used by libavcodec default_get_buffer().
1946 int internal_buffer_count;
1950 * Don't touch, used by libavcodec default_get_buffer().
1952 void *internal_buffer;
1955 * Global quality for codecs which cannot change it per frame.
1956 * This should be proportional to MPEG-1/2/4 qscale.
1957 * - encoding: Set by user.
1958 * - decoding: unused
1962 #define FF_CODER_TYPE_VLC 0
1963 #define FF_CODER_TYPE_AC 1
1964 #define FF_CODER_TYPE_RAW 2
1965 #define FF_CODER_TYPE_RLE 3
1966 #define FF_CODER_TYPE_DEFLATE 4
1969 * - encoding: Set by user.
1970 * - decoding: unused
1976 * - encoding: Set by user.
1977 * - decoding: unused
1983 * - encoding: unused
1984 * - decoding: Set by user.
1986 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1991 * - encoding: unused
1992 * - decoding: Set by user.
1995 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1996 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1997 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2000 * XVideo Motion Acceleration
2001 * - encoding: forbidden
2002 * - decoding: set by decoder
2004 int xvmc_acceleration;
2007 * macroblock decision mode
2008 * - encoding: Set by user.
2009 * - decoding: unused
2012 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2013 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2014 #define FF_MB_DECISION_RD 2 ///< rate distortion
2017 * custom intra quantization matrix
2018 * - encoding: Set by user, can be NULL.
2019 * - decoding: Set by libavcodec.
2021 uint16_t *intra_matrix;
2024 * custom inter quantization matrix
2025 * - encoding: Set by user, can be NULL.
2026 * - decoding: Set by libavcodec.
2028 uint16_t *inter_matrix;
2031 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2032 * This is used to work around some encoder bugs.
2033 * - encoding: unused
2034 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2036 unsigned int stream_codec_tag;
2039 * scene change detection threshold
2040 * 0 is default, larger means fewer detected scene changes.
2041 * - encoding: Set by user.
2042 * - decoding: unused
2044 int scenechange_threshold;
2047 * minimum Lagrange multipler
2048 * - encoding: Set by user.
2049 * - decoding: unused
2054 * maximum Lagrange multipler
2055 * - encoding: Set by user.
2056 * - decoding: unused
2060 #if FF_API_PALETTE_CONTROL
2062 * palette control structure
2063 * - encoding: ??? (no palette-enabled encoder yet)
2064 * - decoding: Set by user.
2066 struct AVPaletteControl *palctrl;
2070 * noise reduction strength
2071 * - encoding: Set by user.
2072 * - decoding: unused
2074 int noise_reduction;
2077 * Called at the beginning of a frame to get cr buffer for it.
2078 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2079 * libavcodec will pass previous buffer in pic, function should return
2080 * same buffer or new buffer with old frame "painted" into it.
2081 * If pic.data[0] == NULL must behave like get_buffer().
2082 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2083 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2085 * - encoding: unused
2086 * - decoding: Set by libavcodec, user can override.
2088 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2091 * Number of bits which should be loaded into the rc buffer before decoding starts.
2092 * - encoding: Set by user.
2093 * - decoding: unused
2095 int rc_initial_buffer_occupancy;
2099 * - encoding: Set by user.
2100 * - decoding: unused
2102 int inter_threshold;
2106 * - encoding: Set by user.
2107 * - decoding: Set by user.
2112 * Simulates errors in the bitstream to test error concealment.
2113 * - encoding: Set by user.
2114 * - decoding: unused
2118 #if FF_API_ANTIALIAS_ALGO
2120 * MP3 antialias algorithm, see FF_AA_* below.
2121 * - encoding: unused
2122 * - decoding: Set by user.
2124 attribute_deprecated int antialias_algo;
2125 #define FF_AA_AUTO 0
2126 #define FF_AA_FASTINT 1 //not implemented yet
2128 #define FF_AA_FLOAT 3
2132 * quantizer noise shaping
2133 * - encoding: Set by user.
2134 * - decoding: unused
2136 int quantizer_noise_shaping;
2140 * is used to decide how many independent tasks should be passed to execute()
2141 * - encoding: Set by user.
2142 * - decoding: Set by user.
2147 * The codec may call this to execute several independent things.
2148 * It will return only after finishing all tasks.
2149 * The user may replace this with some multithreaded implementation,
2150 * the default implementation will execute the parts serially.
2151 * @param count the number of things to execute
2152 * - encoding: Set by libavcodec, user can override.
2153 * - decoding: Set by libavcodec, user can override.
2155 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2159 * Can be used by execute() to store some per AVCodecContext stuff.
2160 * - encoding: set by execute()
2161 * - decoding: set by execute()
2163 void *thread_opaque;
2166 * Motion estimation threshold below which no motion estimation is
2167 * performed, but instead the user specified motion vectors are used.
2169 * - encoding: Set by user.
2170 * - decoding: unused
2175 * Macroblock threshold below which the user specified macroblock types will be used.
2176 * - encoding: Set by user.
2177 * - decoding: unused
2182 * precision of the intra DC coefficient - 8
2183 * - encoding: Set by user.
2184 * - decoding: unused
2186 int intra_dc_precision;
2189 * noise vs. sse weight for the nsse comparsion function
2190 * - encoding: Set by user.
2191 * - decoding: unused
2196 * Number of macroblock rows at the top which are skipped.
2197 * - encoding: unused
2198 * - decoding: Set by user.
2203 * Number of macroblock rows at the bottom which are skipped.
2204 * - encoding: unused
2205 * - decoding: Set by user.
2211 * - encoding: Set by user.
2212 * - decoding: Set by libavcodec.
2215 #define FF_PROFILE_UNKNOWN -99
2216 #define FF_PROFILE_RESERVED -100
2218 #define FF_PROFILE_AAC_MAIN 0
2219 #define FF_PROFILE_AAC_LOW 1
2220 #define FF_PROFILE_AAC_SSR 2
2221 #define FF_PROFILE_AAC_LTP 3
2223 #define FF_PROFILE_DTS 20
2224 #define FF_PROFILE_DTS_ES 30
2225 #define FF_PROFILE_DTS_96_24 40
2226 #define FF_PROFILE_DTS_HD_HRA 50
2227 #define FF_PROFILE_DTS_HD_MA 60
2229 #define FF_PROFILE_MPEG2_422 0
2230 #define FF_PROFILE_MPEG2_HIGH 1
2231 #define FF_PROFILE_MPEG2_SS 2
2232 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2233 #define FF_PROFILE_MPEG2_MAIN 4
2234 #define FF_PROFILE_MPEG2_SIMPLE 5
2236 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2237 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2239 #define FF_PROFILE_H264_BASELINE 66
2240 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2241 #define FF_PROFILE_H264_MAIN 77
2242 #define FF_PROFILE_H264_EXTENDED 88
2243 #define FF_PROFILE_H264_HIGH 100
2244 #define FF_PROFILE_H264_HIGH_10 110
2245 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2246 #define FF_PROFILE_H264_HIGH_422 122
2247 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2248 #define FF_PROFILE_H264_HIGH_444 144
2249 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2250 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2251 #define FF_PROFILE_H264_CAVLC_444 44
2253 #define FF_PROFILE_VC1_SIMPLE 0
2254 #define FF_PROFILE_VC1_MAIN 1
2255 #define FF_PROFILE_VC1_COMPLEX 2
2256 #define FF_PROFILE_VC1_ADVANCED 3
2258 #define FF_PROFILE_MPEG4_SIMPLE 0
2259 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2260 #define FF_PROFILE_MPEG4_CORE 2
2261 #define FF_PROFILE_MPEG4_MAIN 3
2262 #define FF_PROFILE_MPEG4_N_BIT 4
2263 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2264 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2265 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2266 #define FF_PROFILE_MPEG4_HYBRID 8
2267 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2268 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2269 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2270 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2271 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2272 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2273 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2277 * - encoding: Set by user.
2278 * - decoding: Set by libavcodec.
2281 #define FF_LEVEL_UNKNOWN -99
2284 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2285 * - encoding: unused
2286 * - decoding: Set by user.
2291 * Bitstream width / height, may be different from width/height if lowres enabled.
2292 * - encoding: unused
2293 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2295 int coded_width, coded_height;
2298 * frame skip threshold
2299 * - encoding: Set by user.
2300 * - decoding: unused
2302 int frame_skip_threshold;
2306 * - encoding: Set by user.
2307 * - decoding: unused
2309 int frame_skip_factor;
2312 * frame skip exponent
2313 * - encoding: Set by user.
2314 * - decoding: unused
2319 * frame skip comparison function
2320 * - encoding: Set by user.
2321 * - decoding: unused
2326 * Border processing masking, raises the quantizer for mbs on the borders
2328 * - encoding: Set by user.
2329 * - decoding: unused
2331 float border_masking;
2334 * minimum MB lagrange multipler
2335 * - encoding: Set by user.
2336 * - decoding: unused
2341 * maximum MB lagrange multipler
2342 * - encoding: Set by user.
2343 * - decoding: unused
2349 * - encoding: Set by user.
2350 * - decoding: unused
2352 int me_penalty_compensation;
2356 * - encoding: unused
2357 * - decoding: Set by user.
2359 enum AVDiscard skip_loop_filter;
2363 * - encoding: unused
2364 * - decoding: Set by user.
2366 enum AVDiscard skip_idct;
2370 * - encoding: unused
2371 * - decoding: Set by user.
2373 enum AVDiscard skip_frame;
2377 * - encoding: Set by user.
2378 * - decoding: unused
2384 * - encoding: Set by user.
2385 * - decoding: unused
2389 #if FF_API_X264_GLOBAL_OPTS
2391 * constant rate factor - quality-based VBR - values ~correspond to qps
2392 * - encoding: Set by user.
2393 * - decoding: unused
2394 * @deprecated use 'crf' libx264 private option
2396 attribute_deprecated float crf;
2399 * constant quantization parameter rate control method
2400 * - encoding: Set by user.
2401 * - decoding: unused
2402 * @deprecated use 'cqp' libx264 private option
2404 attribute_deprecated int cqp;
2409 * - encoding: Set by user.
2410 * - decoding: unused
2415 * number of reference frames
2416 * - encoding: Set by user.
2417 * - decoding: Set by lavc.
2422 * chroma qp offset from luma
2423 * - encoding: Set by user.
2424 * - decoding: unused
2429 * Influences how often B-frames are used.
2430 * - encoding: Set by user.
2431 * - decoding: unused
2436 * trellis RD quantization
2437 * - encoding: Set by user.
2438 * - decoding: unused
2443 * Reduce fluctuations in qp (before curve compression).
2444 * - encoding: Set by user.
2445 * - decoding: unused
2447 float complexityblur;
2450 * in-loop deblocking filter alphac0 parameter
2451 * alpha is in the range -6...6
2452 * - encoding: Set by user.
2453 * - decoding: unused
2458 * in-loop deblocking filter beta parameter
2459 * beta is in the range -6...6
2460 * - encoding: Set by user.
2461 * - decoding: unused
2466 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2467 * - encoding: Set by user.
2468 * - decoding: unused
2471 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2472 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2473 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2474 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2475 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2478 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2479 * - encoding: Set by user.
2480 * - decoding: unused
2485 * Audio cutoff bandwidth (0 means "automatic")
2486 * - encoding: Set by user.
2487 * - decoding: unused
2492 * Multiplied by qscale for each frame and added to scene_change_score.
2493 * - encoding: Set by user.
2494 * - decoding: unused
2496 int scenechange_factor;
2500 * Note: Value depends upon the compare function used for fullpel ME.
2501 * - encoding: Set by user.
2502 * - decoding: unused
2507 * Adjusts sensitivity of b_frame_strategy 1.
2508 * - encoding: Set by user.
2509 * - decoding: unused
2514 * - encoding: Set by user.
2515 * - decoding: unused
2517 int compression_level;
2518 #define FF_COMPRESSION_DEFAULT -1
2521 * - encoding: Set by user.
2522 * - decoding: unused
2524 int min_prediction_order;
2527 * - encoding: Set by user.
2528 * - decoding: unused
2530 int max_prediction_order;
2532 #if FF_API_FLAC_GLOBAL_OPTS
2534 * @name FLAC options
2535 * @deprecated Use FLAC encoder private options instead.
2540 * LPC coefficient precision - used by FLAC encoder
2541 * - encoding: Set by user.
2542 * - decoding: unused
2544 attribute_deprecated int lpc_coeff_precision;
2547 * search method for selecting prediction order
2548 * - encoding: Set by user.
2549 * - decoding: unused
2551 attribute_deprecated int prediction_order_method;
2554 * - encoding: Set by user.
2555 * - decoding: unused
2557 attribute_deprecated int min_partition_order;
2560 * - encoding: Set by user.
2561 * - decoding: unused
2563 attribute_deprecated int max_partition_order;
2570 * GOP timecode frame start number, in non drop frame format
2571 * - encoding: Set by user.
2572 * - decoding: unused
2574 int64_t timecode_frame_start;
2576 #if FF_API_REQUEST_CHANNELS
2578 * Decoder should decode to this many channels if it can (0 for default)
2579 * - encoding: unused
2580 * - decoding: Set by user.
2581 * @deprecated Deprecated in favor of request_channel_layout.
2583 int request_channels;
2586 #if FF_API_DRC_SCALE
2588 * Percentage of dynamic range compression to be applied by the decoder.
2589 * The default value is 1.0, corresponding to full compression.
2590 * - encoding: unused
2591 * - decoding: Set by user.
2592 * @deprecated use AC3 decoder private option instead.
2594 attribute_deprecated float drc_scale;
2598 * opaque 64bit number (generally a PTS) that will be reordered and
2599 * output in AVFrame.reordered_opaque
2600 * @deprecated in favor of pkt_pts
2601 * - encoding: unused
2602 * - decoding: Set by user.
2604 int64_t reordered_opaque;
2607 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2608 * - encoding: set by user.
2609 * - decoding: set by libavcodec.
2611 int bits_per_raw_sample;
2614 * Audio channel layout.
2615 * - encoding: set by user.
2616 * - decoding: set by libavcodec.
2618 int64_t channel_layout;
2621 * Request decoder to use this channel layout if it can (0 for default)
2622 * - encoding: unused
2623 * - decoding: Set by user.
2625 int64_t request_channel_layout;
2628 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2629 * - encoding: Set by user.
2630 * - decoding: unused.
2632 float rc_max_available_vbv_use;
2635 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2636 * - encoding: Set by user.
2637 * - decoding: unused.
2639 float rc_min_vbv_overflow_use;
2642 * Hardware accelerator in use
2643 * - encoding: unused.
2644 * - decoding: Set by libavcodec
2646 struct AVHWAccel *hwaccel;
2649 * For some codecs, the time base is closer to the field rate than the frame rate.
2650 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2651 * if no telecine is used ...
2653 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2655 int ticks_per_frame;
2658 * Hardware accelerator context.
2659 * For some hardware accelerators, a global context needs to be
2660 * provided by the user. In that case, this holds display-dependent
2661 * data Libav cannot instantiate itself. Please refer to the
2662 * Libav HW accelerator documentation to know how to fill this
2663 * is. e.g. for VA API, this is a struct vaapi_context.
2664 * - encoding: unused
2665 * - decoding: Set by user
2667 void *hwaccel_context;
2670 * Chromaticity coordinates of the source primaries.
2671 * - encoding: Set by user
2672 * - decoding: Set by libavcodec
2674 enum AVColorPrimaries color_primaries;
2677 * Color Transfer Characteristic.
2678 * - encoding: Set by user
2679 * - decoding: Set by libavcodec
2681 enum AVColorTransferCharacteristic color_trc;
2684 * YUV colorspace type.
2685 * - encoding: Set by user
2686 * - decoding: Set by libavcodec
2688 enum AVColorSpace colorspace;
2691 * MPEG vs JPEG YUV range.
2692 * - encoding: Set by user
2693 * - decoding: Set by libavcodec
2695 enum AVColorRange color_range;
2698 * This defines the location of chroma samples.
2699 * - encoding: Set by user
2700 * - decoding: Set by libavcodec
2702 enum AVChromaLocation chroma_sample_location;
2705 * The codec may call this to execute several independent things.
2706 * It will return only after finishing all tasks.
2707 * The user may replace this with some multithreaded implementation,
2708 * the default implementation will execute the parts serially.
2709 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2710 * @param c context passed also to func
2711 * @param count the number of things to execute
2712 * @param arg2 argument passed unchanged to func
2713 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2714 * @param func function that will be called count times, with jobnr from 0 to count-1.
2715 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2716 * two instances of func executing at the same time will have the same threadnr.
2717 * @return always 0 currently, but code should handle a future improvement where when any call to func
2718 * returns < 0 no further calls to func may be done and < 0 is returned.
2719 * - encoding: Set by libavcodec, user can override.
2720 * - decoding: Set by libavcodec, user can override.
2722 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2724 #if FF_API_X264_GLOBAL_OPTS
2726 * explicit P-frame weighted prediction analysis method
2728 * 1: fast blind weighting (one reference duplicate with -1 offset)
2729 * 2: smart weighting (full fade detection analysis)
2730 * - encoding: Set by user.
2731 * - decoding: unused
2733 attribute_deprecated int weighted_p_pred;
2738 * 1: Variance AQ (complexity mask)
2739 * 2: Auto-variance AQ (experimental)
2740 * - encoding: Set by user
2741 * - decoding: unused
2743 attribute_deprecated int aq_mode;
2747 * Reduces blocking and blurring in flat and textured areas.
2748 * - encoding: Set by user
2749 * - decoding: unused
2751 attribute_deprecated float aq_strength;
2755 * Strength of psychovisual optimization
2756 * - encoding: Set by user
2757 * - decoding: unused
2759 attribute_deprecated float psy_rd;
2763 * Strength of psychovisual optimization
2764 * - encoding: Set by user
2765 * - decoding: unused
2767 attribute_deprecated float psy_trellis;
2771 * Number of frames for frametype and ratecontrol lookahead
2772 * - encoding: Set by user
2773 * - decoding: unused
2775 attribute_deprecated int rc_lookahead;
2778 * Constant rate factor maximum
2779 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2780 * than crf_max, even if doing so would violate VBV restrictions.
2781 * - encoding: Set by user.
2782 * - decoding: unused
2784 attribute_deprecated float crf_max;
2787 int log_level_offset;
2789 #if FF_API_FLAC_GLOBAL_OPTS
2791 * Determines which LPC analysis algorithm to use.
2792 * - encoding: Set by user
2793 * - decoding: unused
2795 attribute_deprecated enum AVLPCType lpc_type;
2798 * Number of passes to use for Cholesky factorization during LPC analysis
2799 * - encoding: Set by user
2800 * - decoding: unused
2802 attribute_deprecated int lpc_passes;
2807 * Indicates number of picture subdivisions. Used for parallelized
2809 * - encoding: Set by user
2810 * - decoding: unused
2815 * Header containing style information for text subtitles.
2816 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2817 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2818 * the Format line following. It shouldn't include any Dialogue line.
2819 * - encoding: Set/allocated/freed by user (before avcodec_open())
2820 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2822 uint8_t *subtitle_header;
2823 int subtitle_header_size;
2826 * Current packet as passed into the decoder, to avoid having
2827 * to pass the packet into every function. Currently only valid
2828 * inside lavc and get/release_buffer callbacks.
2829 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2830 * - encoding: unused
2835 * Whether this is a copy of the context which had init() called on it.
2836 * This is used by multithreading - shared tables and picture pointers
2837 * should be freed from the original context only.
2838 * - encoding: Set by libavcodec.
2839 * - decoding: Set by libavcodec.
2844 * Which multithreading methods to use.
2845 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2846 * so clients which cannot provide future frames should not use it.
2848 * - encoding: Set by user, otherwise the default is used.
2849 * - decoding: Set by user, otherwise the default is used.
2852 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2853 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2856 * Which multithreading methods are in use by the codec.
2857 * - encoding: Set by libavcodec.
2858 * - decoding: Set by libavcodec.
2860 int active_thread_type;
2863 * Set by the client if its custom get_buffer() callback can be called
2864 * from another thread, which allows faster multithreaded decoding.
2865 * draw_horiz_band() will be called from other threads regardless of this setting.
2866 * Ignored if the default get_buffer() is used.
2867 * - encoding: Set by user.
2868 * - decoding: Set by user.
2870 int thread_safe_callbacks;
2873 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2874 * Used for compliant TS muxing.
2875 * - encoding: Set by libavcodec.
2876 * - decoding: unused.
2881 * Type of service that the audio stream conveys.
2882 * - encoding: Set by user.
2883 * - decoding: Set by libavcodec.
2885 enum AVAudioServiceType audio_service_type;
2888 * Used to request a sample format from the decoder.
2889 * - encoding: unused.
2890 * - decoding: Set by user.
2892 enum AVSampleFormat request_sample_fmt;
2898 typedef struct AVProfile {
2900 const char *name; ///< short name for the profile
2903 typedef struct AVCodecDefault AVCodecDefault;
2908 typedef struct AVCodec {
2910 * Name of the codec implementation.
2911 * The name is globally unique among encoders and among decoders (but an
2912 * encoder and a decoder can share the same name).
2913 * This is the primary way to find a codec from the user perspective.
2916 enum AVMediaType type;
2919 int (*init)(AVCodecContext *);
2920 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2921 int (*close)(AVCodecContext *);
2922 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2924 * Codec capabilities.
2928 struct AVCodec *next;
2931 * Will be called when seeking
2933 void (*flush)(AVCodecContext *);
2934 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2935 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2937 * Descriptive name for the codec, meant to be more human readable than name.
2938 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2940 const char *long_name;
2941 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2942 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2943 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2944 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2945 const AVClass *priv_class; ///< AVClass for the private context
2946 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2949 * @name Frame-level threading support functions
2953 * If defined, called on thread contexts when they are created.
2954 * If the codec allocates writable tables in init(), re-allocate them here.
2955 * priv_data will be set to a copy of the original.
2957 int (*init_thread_copy)(AVCodecContext *);
2959 * Copy necessary context variables from a previous thread context to the current one.
2960 * If not defined, the next thread will start automatically; otherwise, the codec
2961 * must call ff_thread_finish_setup().
2963 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2965 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2969 * Private codec-specific defaults.
2971 const AVCodecDefault *defaults;
2977 typedef struct AVHWAccel {
2979 * Name of the hardware accelerated codec.
2980 * The name is globally unique among encoders and among decoders (but an
2981 * encoder and a decoder can share the same name).
2986 * Type of codec implemented by the hardware accelerator.
2988 * See AVMEDIA_TYPE_xxx
2990 enum AVMediaType type;
2993 * Codec implemented by the hardware accelerator.
3000 * Supported pixel format.
3002 * Only hardware accelerated formats are supported here.
3004 enum PixelFormat pix_fmt;
3007 * Hardware accelerated codec capabilities.
3008 * see FF_HWACCEL_CODEC_CAP_*
3012 struct AVHWAccel *next;
3015 * Called at the beginning of each frame or field picture.
3017 * Meaningful frame information (codec specific) is guaranteed to
3018 * be parsed at this point. This function is mandatory.
3020 * Note that buf can be NULL along with buf_size set to 0.
3021 * Otherwise, this means the whole frame is available at this point.
3023 * @param avctx the codec context
3024 * @param buf the frame data buffer base
3025 * @param buf_size the size of the frame in bytes
3026 * @return zero if successful, a negative value otherwise
3028 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3031 * Callback for each slice.
3033 * Meaningful slice information (codec specific) is guaranteed to
3034 * be parsed at this point. This function is mandatory.
3036 * @param avctx the codec context
3037 * @param buf the slice data buffer base
3038 * @param buf_size the size of the slice in bytes
3039 * @return zero if successful, a negative value otherwise
3041 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3044 * Called at the end of each frame or field picture.
3046 * The whole picture is parsed at this point and can now be sent
3047 * to the hardware accelerator. This function is mandatory.
3049 * @param avctx the codec context
3050 * @return zero if successful, a negative value otherwise
3052 int (*end_frame)(AVCodecContext *avctx);
3055 * Size of HW accelerator private data.
3057 * Private data is allocated with av_mallocz() before
3058 * AVCodecContext.get_buffer() and deallocated after
3059 * AVCodecContext.release_buffer().
3065 * four components are given, that's all.
3066 * the last component is alpha
3068 typedef struct AVPicture {
3070 int linesize[4]; ///< number of bytes per line
3073 #if FF_API_PALETTE_CONTROL
3076 * This structure defines a method for communicating palette changes
3077 * between and demuxer and a decoder.
3079 * @deprecated Use AVPacket to send palette changes instead.
3080 * This is totally broken.
3082 #define AVPALETTE_SIZE 1024
3083 #define AVPALETTE_COUNT 256
3084 typedef struct AVPaletteControl {
3086 /* Demuxer sets this to 1 to indicate the palette has changed;
3087 * decoder resets to 0. */
3088 int palette_changed;
3090 /* 4-byte ARGB palette entries, stored in native byte order; note that
3091 * the individual palette components should be on a 8-bit scale; if
3092 * the palette data comes from an IBM VGA native format, the component
3093 * data is probably 6 bits in size and needs to be scaled. */
3094 unsigned int palette[AVPALETTE_COUNT];
3096 } AVPaletteControl attribute_deprecated;
3099 enum AVSubtitleType {
3102 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3105 * Plain text, the text field must be set by the decoder and is
3106 * authoritative. ass and pict fields may contain approximations.
3111 * Formatted text, the ass field must be set by the decoder and is
3112 * authoritative. pict and text fields may contain approximations.
3117 typedef struct AVSubtitleRect {
3118 int x; ///< top left corner of pict, undefined when pict is not set
3119 int y; ///< top left corner of pict, undefined when pict is not set
3120 int w; ///< width of pict, undefined when pict is not set
3121 int h; ///< height of pict, undefined when pict is not set
3122 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3125 * data+linesize for the bitmap of this subtitle.
3126 * can be set for text/ass as well once they where rendered
3129 enum AVSubtitleType type;
3131 char *text; ///< 0 terminated plain UTF-8 text
3134 * 0 terminated ASS/SSA compatible event line.
3135 * The pressentation of this is unaffected by the other values in this
3141 typedef struct AVSubtitle {
3142 uint16_t format; /* 0 = graphics */
3143 uint32_t start_display_time; /* relative to packet pts, in ms */
3144 uint32_t end_display_time; /* relative to packet pts, in ms */
3146 AVSubtitleRect **rects;
3147 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3150 /* packet functions */
3153 * @deprecated use NULL instead
3155 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3158 * Default packet destructor.
3160 void av_destruct_packet(AVPacket *pkt);
3163 * Initialize optional fields of a packet with default values.
3167 void av_init_packet(AVPacket *pkt);
3170 * Allocate the payload of a packet and initialize its fields with
3174 * @param size wanted payload size
3175 * @return 0 if OK, AVERROR_xxx otherwise
3177 int av_new_packet(AVPacket *pkt, int size);
3180 * Reduce packet size, correctly zeroing padding
3183 * @param size new size
3185 void av_shrink_packet(AVPacket *pkt, int size);
3188 * Increase packet size, correctly zeroing padding
3191 * @param grow_by number of bytes by which to increase the size of the packet
3193 int av_grow_packet(AVPacket *pkt, int grow_by);
3196 * @warning This is a hack - the packet memory allocation stuff is broken. The
3197 * packet is allocated if it was not really allocated.
3199 int av_dup_packet(AVPacket *pkt);
3204 * @param pkt packet to free
3206 void av_free_packet(AVPacket *pkt);
3209 * Allocate new information of a packet.
3212 * @param type side information type
3213 * @param size side information size
3214 * @return pointer to fresh allocated data or NULL otherwise
3216 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3220 * Get side information from packet.
3223 * @param type desired side information type
3224 * @param size pointer for side information size to store (optional)
3225 * @return pointer to data if present or NULL otherwise
3227 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3232 struct ReSampleContext;
3233 struct AVResampleContext;
3235 typedef struct ReSampleContext ReSampleContext;
3238 * Initialize audio resampling context.
3240 * @param output_channels number of output channels
3241 * @param input_channels number of input channels
3242 * @param output_rate output sample rate
3243 * @param input_rate input sample rate
3244 * @param sample_fmt_out requested output sample format
3245 * @param sample_fmt_in input sample format
3246 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3247 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3248 * @param linear if 1 then the used FIR filter will be linearly interpolated
3249 between the 2 closest, if 0 the closest will be used
3250 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3251 * @return allocated ReSampleContext, NULL if error occured
3253 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3254 int output_rate, int input_rate,
3255 enum AVSampleFormat sample_fmt_out,
3256 enum AVSampleFormat sample_fmt_in,
3257 int filter_length, int log2_phase_count,
3258 int linear, double cutoff);
3260 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3263 * Free resample context.
3265 * @param s a non-NULL pointer to a resample context previously
3266 * created with av_audio_resample_init()
3268 void audio_resample_close(ReSampleContext *s);
3272 * Initialize an audio resampler.
3273 * Note, if either rate is not an integer then simply scale both rates up so they are.
3274 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3275 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3276 * @param linear If 1 then the used FIR filter will be linearly interpolated
3277 between the 2 closest, if 0 the closest will be used
3278 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3280 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3283 * Resample an array of samples using a previously configured context.
3284 * @param src an array of unconsumed samples
3285 * @param consumed the number of samples of src which have been consumed are returned here
3286 * @param src_size the number of unconsumed samples available
3287 * @param dst_size the amount of space in samples available in dst
3288 * @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.
3289 * @return the number of samples written in dst or -1 if an error occurred
3291 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3295 * Compensate samplerate/timestamp drift. The compensation is done by changing
3296 * the resampler parameters, so no audible clicks or similar distortions occur
3297 * @param compensation_distance distance in output samples over which the compensation should be performed
3298 * @param sample_delta number of output samples which should be output less
3300 * example: av_resample_compensate(c, 10, 500)
3301 * here instead of 510 samples only 500 samples would be output
3303 * note, due to rounding the actual compensation might be slightly different,
3304 * especially if the compensation_distance is large and the in_rate used during init is small
3306 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3307 void av_resample_close(struct AVResampleContext *c);
3310 * Allocate memory for a picture. Call avpicture_free() to free it.
3312 * @see avpicture_fill()
3314 * @param picture the picture to be filled in
3315 * @param pix_fmt the format of the picture
3316 * @param width the width of the picture
3317 * @param height the height of the picture
3318 * @return zero if successful, a negative value if not
3320 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3323 * Free a picture previously allocated by avpicture_alloc().
3324 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3327 * @param picture the AVPicture to be freed
3329 void avpicture_free(AVPicture *picture);
3332 * Fill in the AVPicture fields.
3333 * The fields of the given AVPicture are filled in by using the 'ptr' address
3334 * which points to the image data buffer. Depending on the specified picture
3335 * format, one or multiple image data pointers and line sizes will be set.
3336 * If a planar format is specified, several pointers will be set pointing to
3337 * the different picture planes and the line sizes of the different planes
3338 * will be stored in the lines_sizes array.
3339 * Call with ptr == NULL to get the required size for the ptr buffer.
3341 * To allocate the buffer and fill in the AVPicture fields in one call,
3342 * use avpicture_alloc().
3344 * @param picture AVPicture whose fields are to be filled in
3345 * @param ptr Buffer which will contain or contains the actual image data
3346 * @param pix_fmt The format in which the picture data is stored.
3347 * @param width the width of the image in pixels
3348 * @param height the height of the image in pixels
3349 * @return size of the image data in bytes
3351 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3352 enum PixelFormat pix_fmt, int width, int height);
3355 * Copy pixel data from an AVPicture into a buffer.
3356 * The data is stored compactly, without any gaps for alignment or padding
3357 * which may be applied by avpicture_fill().
3359 * @see avpicture_get_size()
3361 * @param[in] src AVPicture containing image data
3362 * @param[in] pix_fmt The format in which the picture data is stored.
3363 * @param[in] width the width of the image in pixels.
3364 * @param[in] height the height of the image in pixels.
3365 * @param[out] dest A buffer into which picture data will be copied.
3366 * @param[in] dest_size The size of 'dest'.
3367 * @return The number of bytes written to dest, or a negative value (error code) on error.
3369 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3370 unsigned char *dest, int dest_size);
3373 * Calculate the size in bytes that a picture of the given width and height
3374 * would occupy if stored in the given picture format.
3375 * Note that this returns the size of a compact representation as generated
3376 * by avpicture_layout(), which can be smaller than the size required for e.g.
3379 * @param pix_fmt the given picture format
3380 * @param width the width of the image
3381 * @param height the height of the image
3382 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3384 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3385 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3387 #if FF_API_GET_PIX_FMT_NAME
3389 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3391 attribute_deprecated
3392 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3395 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3398 * Return a value representing the fourCC code associated to the
3399 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3402 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3405 * Put a string representing the codec tag codec_tag in buf.
3407 * @param buf_size size in bytes of buf
3408 * @return the length of the string that would have been generated if
3409 * enough space had been available, excluding the trailing null
3411 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3413 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3414 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3415 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3416 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3417 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3418 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3421 * Compute what kind of losses will occur when converting from one specific
3422 * pixel format to another.
3423 * When converting from one pixel format to another, information loss may occur.
3424 * For example, when converting from RGB24 to GRAY, the color information will
3425 * be lost. Similarly, other losses occur when converting from some formats to
3426 * other formats. These losses can involve loss of chroma, but also loss of
3427 * resolution, loss of color depth, loss due to the color space conversion, loss
3428 * of the alpha bits or loss due to color quantization.
3429 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3430 * which will occur when converting from one pixel format to another.
3432 * @param[in] dst_pix_fmt destination pixel format
3433 * @param[in] src_pix_fmt source pixel format
3434 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3435 * @return Combination of flags informing you what kind of losses will occur.
3437 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3441 * Find the best pixel format to convert to given a certain source pixel
3442 * format. When converting from one pixel format to another, information loss
3443 * may occur. For example, when converting from RGB24 to GRAY, the color
3444 * information will be lost. Similarly, other losses occur when converting from
3445 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3446 * the given pixel formats should be used to suffer the least amount of loss.
3447 * The pixel formats from which it chooses one, are determined by the
3448 * pix_fmt_mask parameter.
3451 * src_pix_fmt = PIX_FMT_YUV420P;
3452 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3453 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3456 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3457 * @param[in] src_pix_fmt source pixel format
3458 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3459 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3460 * @return The best pixel format to convert to or -1 if none was found.
3462 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3463 int has_alpha, int *loss_ptr);
3465 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3466 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3469 * Tell if an image really has transparent alpha values.
3470 * @return ored mask of FF_ALPHA_xxx constants
3472 int img_get_alpha_info(const AVPicture *src,
3473 enum PixelFormat pix_fmt, int width, int height);
3475 /* deinterlace a picture */
3476 /* deinterlace - if not supported return -1 */
3477 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3478 enum PixelFormat pix_fmt, int width, int height);
3480 /* external high level API */
3483 * If c is NULL, returns the first registered codec,
3484 * if c is non-NULL, returns the next registered codec after c,
3485 * or NULL if c is the last one.
3487 AVCodec *av_codec_next(AVCodec *c);
3490 * Return the LIBAVCODEC_VERSION_INT constant.
3492 unsigned avcodec_version(void);
3495 * Return the libavcodec build-time configuration.
3497 const char *avcodec_configuration(void);
3500 * Return the libavcodec license.
3502 const char *avcodec_license(void);
3504 #if FF_API_AVCODEC_INIT
3506 * @deprecated this function is called automatically from avcodec_register()
3507 * and avcodec_register_all(), there is no need to call it manually
3509 attribute_deprecated
3510 void avcodec_init(void);
3514 * Register the codec codec and initialize libavcodec.
3516 * @warning either this function or avcodec_register_all() must be called
3517 * before any other libavcodec functions.
3519 * @see avcodec_register_all()
3521 void avcodec_register(AVCodec *codec);
3524 * Find a registered encoder with a matching codec ID.
3526 * @param id CodecID of the requested encoder
3527 * @return An encoder if one was found, NULL otherwise.
3529 AVCodec *avcodec_find_encoder(enum CodecID id);
3532 * Find a registered encoder with the specified name.
3534 * @param name name of the requested encoder
3535 * @return An encoder if one was found, NULL otherwise.
3537 AVCodec *avcodec_find_encoder_by_name(const char *name);
3540 * Find a registered decoder with a matching codec ID.
3542 * @param id CodecID of the requested decoder
3543 * @return A decoder if one was found, NULL otherwise.
3545 AVCodec *avcodec_find_decoder(enum CodecID id);
3548 * Find a registered decoder with the specified name.
3550 * @param name name of the requested decoder
3551 * @return A decoder if one was found, NULL otherwise.
3553 AVCodec *avcodec_find_decoder_by_name(const char *name);
3554 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3557 * Return a name for the specified profile, if available.
3559 * @param codec the codec that is searched for the given profile
3560 * @param profile the profile value for which a name is requested
3561 * @return A name for the profile if found, NULL otherwise.
3563 const char *av_get_profile_name(const AVCodec *codec, int profile);
3566 * Set the fields of the given AVCodecContext to default values.
3568 * @param s The AVCodecContext of which the fields should be set to default values.
3570 void avcodec_get_context_defaults(AVCodecContext *s);
3572 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3573 * we WILL change its arguments and name a few times! */
3574 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3576 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3577 * we WILL change its arguments and name a few times! */
3578 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3580 #if FF_API_ALLOC_CONTEXT
3582 * Allocate an AVCodecContext and set its fields to default values. The
3583 * resulting struct can be deallocated by simply calling av_free().
3585 * @return An AVCodecContext filled with default values or NULL on failure.
3586 * @see avcodec_get_context_defaults
3588 * @deprecated use avcodec_alloc_context3()
3590 attribute_deprecated
3591 AVCodecContext *avcodec_alloc_context(void);
3593 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3594 * we WILL change its arguments and name a few times! */
3595 attribute_deprecated
3596 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3600 * Allocate an AVCodecContext and set its fields to default values. The
3601 * resulting struct can be deallocated by simply calling av_free().
3603 * @param codec if non-NULL, allocate private data and initialize defaults
3604 * for the given codec. It is illegal to then call avcodec_open()
3605 * with a different codec.
3607 * @return An AVCodecContext filled with default values or NULL on failure.
3608 * @see avcodec_get_context_defaults
3610 * @deprecated use avcodec_alloc_context3()
3612 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3615 * Copy the settings of the source AVCodecContext into the destination
3616 * AVCodecContext. The resulting destination codec context will be
3617 * unopened, i.e. you are required to call avcodec_open() before you
3618 * can use this AVCodecContext to decode/encode video/audio data.
3620 * @param dest target codec context, should be initialized with
3621 * avcodec_alloc_context3(), but otherwise uninitialized
3622 * @param src source codec context
3623 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3625 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3628 * Set the fields of the given AVFrame to default values.
3630 * @param pic The AVFrame of which the fields should be set to default values.
3632 void avcodec_get_frame_defaults(AVFrame *pic);
3635 * Allocate an AVFrame and set its fields to default values. The resulting
3636 * struct can be deallocated by simply calling av_free().
3638 * @return An AVFrame filled with default values or NULL on failure.
3639 * @see avcodec_get_frame_defaults
3641 AVFrame *avcodec_alloc_frame(void);
3643 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3644 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3645 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3648 * Return the amount of padding in pixels which the get_buffer callback must
3649 * provide around the edge of the image for codecs which do not have the
3650 * CODEC_FLAG_EMU_EDGE flag.
3652 * @return Required padding in pixels.
3654 unsigned avcodec_get_edge_width(void);
3656 * Modify width and height values so that they will result in a memory
3657 * buffer that is acceptable for the codec if you do not use any horizontal
3660 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3661 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3662 * according to avcodec_get_edge_width() before.
3664 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3666 * Modify width and height values so that they will result in a memory
3667 * buffer that is acceptable for the codec if you also ensure that all
3668 * line sizes are a multiple of the respective linesize_align[i].
3670 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3671 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3672 * according to avcodec_get_edge_width() before.
3674 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3675 int linesize_align[4]);
3677 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3679 #if FF_API_THREAD_INIT
3681 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3683 attribute_deprecated
3684 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3687 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3688 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3689 //FIXME func typedef
3691 #if FF_API_AVCODEC_OPEN
3693 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3694 * function the context has to be allocated.
3696 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3697 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3698 * retrieving a codec.
3700 * @warning This function is not thread safe!
3703 * avcodec_register_all();
3704 * codec = avcodec_find_decoder(CODEC_ID_H264);
3708 * context = avcodec_alloc_context3(codec);
3710 * if (avcodec_open(context, codec) < 0)
3714 * @param avctx The context which will be set up to use the given codec.
3715 * @param codec The codec to use within the context.
3716 * @return zero on success, a negative value on error
3717 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3719 * @deprecated use avcodec_open2
3721 attribute_deprecated
3722 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3726 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3727 * function the context has to be allocated with avcodec_alloc_context().
3729 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3730 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3731 * retrieving a codec.
3733 * @warning This function is not thread safe!
3736 * avcodec_register_all();
3737 * av_dict_set(&opts, "b", "2.5M", 0);
3738 * codec = avcodec_find_decoder(CODEC_ID_H264);
3742 * context = avcodec_alloc_context();
3744 * if (avcodec_open(context, codec, opts) < 0)
3748 * @param avctx The context to initialize.
3749 * @param options A dictionary filled with AVCodecContext and codec-private options.
3750 * On return this object will be filled with options that were not found.
3752 * @return zero on success, a negative value on error
3753 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3754 * av_dict_set(), av_opt_find().
3756 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3759 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3760 * Some decoders may support multiple frames in a single AVPacket, such
3761 * decoders would then just decode the first frame. In this case,
3762 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3763 * the remaining data in order to decode the second frame etc.
3765 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3766 * decompressed frame size in bytes.
3768 * @warning You must set frame_size_ptr to the allocated size of the
3769 * output buffer before calling avcodec_decode_audio3().
3771 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3772 * the actual read bytes because some optimized bitstream readers read 32 or 64
3773 * bits at once and could read over the end.
3775 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3776 * no overreading happens for damaged MPEG streams.
3778 * @note You might have to align the input buffer avpkt->data and output buffer
3779 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3780 * necessary at all, on others it won't work at all if not aligned and on others
3781 * it will work but it will have an impact on performance.
3783 * In practice, avpkt->data should have 4 byte alignment at minimum and
3784 * samples should be 16 byte aligned unless the CPU doesn't need it
3785 * (AltiVec and SSE do).
3787 * @param avctx the codec context
3788 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3789 * @param[in,out] frame_size_ptr the output buffer size in bytes
3790 * @param[in] avpkt The input AVPacket containing the input buffer.
3791 * You can create such packet with av_init_packet() and by then setting
3792 * data and size, some decoders might in addition need other fields.
3793 * All decoders are designed to use the least fields possible though.
3794 * @return On error a negative value is returned, otherwise the number of bytes
3795 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3797 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3798 int *frame_size_ptr,
3802 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3803 * Some decoders may support multiple frames in a single AVPacket, such
3804 * decoders would then just decode the first frame.
3806 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3807 * the actual read bytes because some optimized bitstream readers read 32 or 64
3808 * bits at once and could read over the end.
3810 * @warning The end of the input buffer buf should be set to 0 to ensure that
3811 * no overreading happens for damaged MPEG streams.
3813 * @note You might have to align the input buffer avpkt->data.
3814 * The alignment requirements depend on the CPU: on some CPUs it isn't
3815 * necessary at all, on others it won't work at all if not aligned and on others
3816 * it will work but it will have an impact on performance.
3818 * In practice, avpkt->data should have 4 byte alignment at minimum.
3820 * @note Some codecs have a delay between input and output, these need to be
3821 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3823 * @param avctx the codec context
3824 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3825 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3826 * allocate memory for the actual bitmap.
3827 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3828 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3829 * decodes and the decoder tells the user once it does not need the data anymore,
3830 * the user app can at this point free/reuse/keep the memory as it sees fit.
3832 * @param[in] avpkt The input AVpacket containing the input buffer.
3833 * You can create such packet with av_init_packet() and by then setting
3834 * data and size, some decoders might in addition need other fields like
3835 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3837 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3838 * @return On error a negative value is returned, otherwise the number of bytes
3839 * used or zero if no frame could be decompressed.
3841 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3842 int *got_picture_ptr,
3846 * Decode a subtitle message.
3847 * Return a negative value on error, otherwise return the number of bytes used.
3848 * If no subtitle could be decompressed, got_sub_ptr is zero.
3849 * Otherwise, the subtitle is stored in *sub.
3850 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3851 * simplicity, because the performance difference is expect to be negligible
3852 * and reusing a get_buffer written for video codecs would probably perform badly
3853 * due to a potentially very different allocation pattern.
3855 * @param avctx the codec context
3856 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3857 freed with avsubtitle_free if *got_sub_ptr is set.
3858 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3859 * @param[in] avpkt The input AVPacket containing the input buffer.
3861 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3866 * Frees all allocated data in the given subtitle struct.
3868 * @param sub AVSubtitle to free.
3870 void avsubtitle_free(AVSubtitle *sub);
3872 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3874 uint8_t *buf, int buf_size);
3877 * Encode an audio frame from samples into buf.
3879 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3880 * However, for PCM audio the user will know how much space is needed
3881 * because it depends on the value passed in buf_size as described
3882 * below. In that case a lower value can be used.
3884 * @param avctx the codec context
3885 * @param[out] buf the output buffer
3886 * @param[in] buf_size the output buffer size
3887 * @param[in] samples the input buffer containing the samples
3888 * The number of samples read from this buffer is frame_size*channels,
3889 * both of which are defined in avctx.
3890 * For PCM audio the number of samples read from samples is equal to
3891 * buf_size * input_sample_size / output_sample_size.
3892 * @return On error a negative value is returned, on success zero or the number
3893 * of bytes used to encode the data read from the input buffer.
3895 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3896 const short *samples);
3899 * Encode a video frame from pict into buf.
3900 * The input picture should be
3901 * stored using a specific format, namely avctx.pix_fmt.
3903 * @param avctx the codec context
3904 * @param[out] buf the output buffer for the bitstream of encoded frame
3905 * @param[in] buf_size the size of the output buffer in bytes
3906 * @param[in] pict the input picture to encode
3907 * @return On error a negative value is returned, on success zero or the number
3908 * of bytes used from the output buffer.
3910 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3911 const AVFrame *pict);
3912 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3913 const AVSubtitle *sub);
3915 int avcodec_close(AVCodecContext *avctx);
3918 * Register all the codecs, parsers and bitstream filters which were enabled at
3919 * configuration time. If you do not call this function you can select exactly
3920 * which formats you want to support, by using the individual registration
3923 * @see avcodec_register
3924 * @see av_register_codec_parser
3925 * @see av_register_bitstream_filter
3927 void avcodec_register_all(void);
3930 * Flush buffers, should be called when seeking or when switching to a different stream.
3932 void avcodec_flush_buffers(AVCodecContext *avctx);
3934 void avcodec_default_free_buffers(AVCodecContext *s);
3936 /* misc useful functions */
3938 #if FF_API_OLD_FF_PICT_TYPES
3940 * Return a single letter to describe the given picture type pict_type.
3942 * @param[in] pict_type the picture type
3943 * @return A single character representing the picture type.
3944 * @deprecated Use av_get_picture_type_char() instead.
3946 attribute_deprecated
3947 char av_get_pict_type_char(int pict_type);
3951 * Return codec bits per sample.
3953 * @param[in] codec_id the codec
3954 * @return Number of bits per sample or zero if unknown for the given codec.
3956 int av_get_bits_per_sample(enum CodecID codec_id);
3958 #if FF_API_OLD_SAMPLE_FMT
3960 * @deprecated Use av_get_bytes_per_sample() instead.
3962 attribute_deprecated
3963 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
3967 typedef struct AVCodecParserContext {
3969 struct AVCodecParser *parser;
3970 int64_t frame_offset; /* offset of the current frame */
3971 int64_t cur_offset; /* current offset
3972 (incremented by each av_parser_parse()) */
3973 int64_t next_frame_offset; /* offset of the next frame */
3975 int pict_type; /* XXX: Put it back in AVCodecContext. */
3977 * This field is used for proper frame duration computation in lavf.
3978 * It signals, how much longer the frame duration of the current frame
3979 * is compared to normal frame duration.
3981 * frame_duration = (1 + repeat_pict) * time_base
3983 * It is used by codecs like H.264 to display telecined material.
3985 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3986 int64_t pts; /* pts of the current frame */
3987 int64_t dts; /* dts of the current frame */
3992 int fetch_timestamp;
3994 #define AV_PARSER_PTS_NB 4
3995 int cur_frame_start_index;
3996 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3997 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3998 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4001 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4002 #define PARSER_FLAG_ONCE 0x0002
4003 /// Set if the parser has a valid file offset
4004 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4006 int64_t offset; ///< byte offset from starting packet start
4007 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4010 * Set by parser to 1 for key frames and 0 for non-key frames.
4011 * It is initialized to -1, so if the parser doesn't set this flag,
4012 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4018 * Time difference in stream time base units from the pts of this
4019 * packet to the point at which the output from the decoder has converged
4020 * independent from the availability of previous frames. That is, the
4021 * frames are virtually identical no matter if decoding started from
4022 * the very first frame or from this keyframe.
4023 * Is AV_NOPTS_VALUE if unknown.
4024 * This field is not the display duration of the current frame.
4025 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4028 * The purpose of this field is to allow seeking in streams that have no
4029 * keyframes in the conventional sense. It corresponds to the
4030 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4031 * essential for some types of subtitle streams to ensure that all
4032 * subtitles are correctly displayed after seeking.
4034 int64_t convergence_duration;
4036 // Timestamp generation support:
4038 * Synchronization point for start of timestamp generation.
4040 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4043 * For example, this corresponds to presence of H.264 buffering period
4049 * Offset of the current timestamp against last timestamp sync point in
4050 * units of AVCodecContext.time_base.
4052 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4053 * contain a valid timestamp offset.
4055 * Note that the timestamp of sync point has usually a nonzero
4056 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4057 * the next frame after timestamp sync point will be usually 1.
4059 * For example, this corresponds to H.264 cpb_removal_delay.
4061 int dts_ref_dts_delta;
4064 * Presentation delay of current frame in units of AVCodecContext.time_base.
4066 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4067 * contain valid non-negative timestamp delta (presentation time of a frame
4068 * must not lie in the past).
4070 * This delay represents the difference between decoding and presentation
4071 * time of the frame.
4073 * For example, this corresponds to H.264 dpb_output_delay.
4078 * Position of the packet in file.
4080 * Analogous to cur_frame_pts/dts
4082 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4085 * Byte position of currently parsed frame in stream.
4090 * Previous frame byte position.
4093 } AVCodecParserContext;
4095 typedef struct AVCodecParser {
4096 int codec_ids[5]; /* several codec IDs are permitted */
4098 int (*parser_init)(AVCodecParserContext *s);
4099 int (*parser_parse)(AVCodecParserContext *s,
4100 AVCodecContext *avctx,
4101 const uint8_t **poutbuf, int *poutbuf_size,
4102 const uint8_t *buf, int buf_size);
4103 void (*parser_close)(AVCodecParserContext *s);
4104 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4105 struct AVCodecParser *next;
4108 AVCodecParser *av_parser_next(AVCodecParser *c);
4110 void av_register_codec_parser(AVCodecParser *parser);
4111 AVCodecParserContext *av_parser_init(int codec_id);
4116 * @param s parser context.
4117 * @param avctx codec context.
4118 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4119 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4120 * @param buf input buffer.
4121 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4122 * @param pts input presentation timestamp.
4123 * @param dts input decoding timestamp.
4124 * @param pos input byte position in stream.
4125 * @return the number of bytes of the input bitstream used.
4130 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4137 * decode_frame(data, size);
4141 int av_parser_parse2(AVCodecParserContext *s,
4142 AVCodecContext *avctx,
4143 uint8_t **poutbuf, int *poutbuf_size,
4144 const uint8_t *buf, int buf_size,
4145 int64_t pts, int64_t dts,
4148 int av_parser_change(AVCodecParserContext *s,
4149 AVCodecContext *avctx,
4150 uint8_t **poutbuf, int *poutbuf_size,
4151 const uint8_t *buf, int buf_size, int keyframe);
4152 void av_parser_close(AVCodecParserContext *s);
4155 typedef struct AVBitStreamFilterContext {
4157 struct AVBitStreamFilter *filter;
4158 AVCodecParserContext *parser;
4159 struct AVBitStreamFilterContext *next;
4160 } AVBitStreamFilterContext;
4163 typedef struct AVBitStreamFilter {
4166 int (*filter)(AVBitStreamFilterContext *bsfc,
4167 AVCodecContext *avctx, const char *args,
4168 uint8_t **poutbuf, int *poutbuf_size,
4169 const uint8_t *buf, int buf_size, int keyframe);
4170 void (*close)(AVBitStreamFilterContext *bsfc);
4171 struct AVBitStreamFilter *next;
4172 } AVBitStreamFilter;
4174 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4175 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4176 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4177 AVCodecContext *avctx, const char *args,
4178 uint8_t **poutbuf, int *poutbuf_size,
4179 const uint8_t *buf, int buf_size, int keyframe);
4180 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4182 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4187 * Reallocate the given block if it is not large enough, otherwise do nothing.
4191 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4194 * Allocate a buffer, reusing the given one if large enough.
4196 * Contrary to av_fast_realloc the current buffer contents might not be
4197 * preserved and on error the old buffer is freed, thus no special
4198 * handling to avoid memleaks is necessary.
4200 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4201 * @param size size of the buffer *ptr points to
4202 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4203 * *size 0 if an error occurred.
4205 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4208 * Copy image src to dst. Wraps av_picture_data_copy() above.
4210 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4211 enum PixelFormat pix_fmt, int width, int height);
4214 * Crop image top and left side.
4216 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4217 enum PixelFormat pix_fmt, int top_band, int left_band);
4222 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4223 int padtop, int padbottom, int padleft, int padright, int *color);
4226 * Encode extradata length to a buffer. Used by xiph codecs.
4228 * @param s buffer to write to; must be at least (v/255+1) bytes long
4229 * @param v size of extradata in bytes
4230 * @return number of bytes written to the buffer.
4232 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4235 * Logs a generic warning message about a missing feature. This function is
4236 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4237 * only, and would normally not be used by applications.
4238 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4239 * a pointer to an AVClass struct
4240 * @param[in] feature string containing the name of the missing feature
4241 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4242 * If want_sample is non-zero, additional verbage will be added to the log
4243 * message which tells the user how to report samples to the development
4246 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4249 * Log a generic warning message asking for a sample. This function is
4250 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4251 * only, and would normally not be used by applications.
4252 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4253 * a pointer to an AVClass struct
4254 * @param[in] msg string containing an optional message, or NULL if no message
4256 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4259 * Register the hardware accelerator hwaccel.
4261 void av_register_hwaccel(AVHWAccel *hwaccel);
4264 * If hwaccel is NULL, returns the first registered hardware accelerator,
4265 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4266 * after hwaccel, or NULL if hwaccel is the last one.
4268 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4272 * Lock operation used by lockmgr
4275 AV_LOCK_CREATE, ///< Create a mutex
4276 AV_LOCK_OBTAIN, ///< Lock the mutex
4277 AV_LOCK_RELEASE, ///< Unlock the mutex
4278 AV_LOCK_DESTROY, ///< Free mutex resources
4282 * Register a user provided lock manager supporting the operations
4283 * specified by AVLockOp. mutex points to a (void *) where the
4284 * lockmgr should store/get a pointer to a user allocated mutex. It's
4285 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4287 * @param cb User defined callback. Note: Libav may invoke calls to this
4288 * callback during the call to av_lockmgr_register().
4289 * Thus, the application must be prepared to handle that.
4290 * If cb is set to NULL the lockmgr will be unregistered.
4291 * Also note that during unregistration the previously registered
4292 * lockmgr callback may also be invoked.
4294 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4297 * Get the type of the given codec.
4299 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4301 #endif /* AVCODEC_AVCODEC_H */