2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
34 #include "libavcodec/version.h"
37 * Identify the syntax and semantics of the bitstream.
38 * The principle is roughly:
39 * Two decoders with the same ID can decode the same streams.
40 * Two encoders with the same ID can encode compatible streams.
41 * There may be slight deviations from the principle due to implementation
44 * If you add a codec ID to this list, add it so that
45 * 1. no value of a existing codec ID changes (that would break ABI),
46 * 2. it is as close as possible to similar codecs.
53 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
54 CODEC_ID_MPEG2VIDEO_XVMC,
91 CODEC_ID_INTERPLAY_VIDEO,
103 CODEC_ID_TRUEMOTION1,
130 CODEC_ID_TRUEMOTION2,
147 CODEC_ID_DSICINVIDEO,
148 CODEC_ID_TIERTEXSEQVIDEO,
157 CODEC_ID_BETHSOFTVID,
175 CODEC_ID_MOTIONPIXELS,
193 CODEC_ID_IFF_BYTERUN1,
208 /* various PCM "codecs" */
209 CODEC_ID_PCM_S16LE= 0x10000,
225 CODEC_ID_PCM_S24DAUD,
227 CODEC_ID_PCM_S16LE_PLANAR,
236 /* various ADPCM codecs */
237 CODEC_ID_ADPCM_IMA_QT= 0x11000,
238 CODEC_ID_ADPCM_IMA_WAV,
239 CODEC_ID_ADPCM_IMA_DK3,
240 CODEC_ID_ADPCM_IMA_DK4,
241 CODEC_ID_ADPCM_IMA_WS,
242 CODEC_ID_ADPCM_IMA_SMJPEG,
251 CODEC_ID_ADPCM_YAMAHA,
252 CODEC_ID_ADPCM_SBPRO_4,
253 CODEC_ID_ADPCM_SBPRO_3,
254 CODEC_ID_ADPCM_SBPRO_2,
256 CODEC_ID_ADPCM_IMA_AMV,
257 CODEC_ID_ADPCM_EA_R1,
258 CODEC_ID_ADPCM_EA_R3,
259 CODEC_ID_ADPCM_EA_R2,
260 CODEC_ID_ADPCM_IMA_EA_SEAD,
261 CODEC_ID_ADPCM_IMA_EA_EACS,
262 CODEC_ID_ADPCM_EA_XAS,
263 CODEC_ID_ADPCM_EA_MAXIS_XA,
264 CODEC_ID_ADPCM_IMA_ISS,
268 CODEC_ID_AMR_NB= 0x12000,
271 /* RealAudio codecs*/
272 CODEC_ID_RA_144= 0x13000,
275 /* various DPCM codecs */
276 CODEC_ID_ROQ_DPCM= 0x14000,
277 CODEC_ID_INTERPLAY_DPCM,
282 CODEC_ID_MP2= 0x15000,
283 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
301 CODEC_ID_WESTWOOD_SND1,
302 CODEC_ID_GSM, ///< as in Berlin toast format
310 CODEC_ID_DSICINAUDIO,
314 CODEC_ID_GSM_MS, /* as found in WAV */
323 CODEC_ID_WMALOSSLESS,
332 CODEC_ID_BINKAUDIO_RDFT,
333 CODEC_ID_BINKAUDIO_DCT,
338 /* subtitle codecs */
339 CODEC_ID_DVD_SUBTITLE= 0x17000,
340 CODEC_ID_DVB_SUBTITLE,
341 CODEC_ID_TEXT, ///< raw UTF-8 text
345 CODEC_ID_HDMV_PGS_SUBTITLE,
346 CODEC_ID_DVB_TELETEXT,
350 /* other specific kind of codecs (generally used for attachments) */
351 CODEC_ID_TTF= 0x18000,
353 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
355 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
356 * stream (only used by libavformat) */
357 CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
360 #if FF_API_OLD_SAMPLE_FMT
361 #define SampleFormat AVSampleFormat
363 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
364 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
365 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
366 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
367 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
368 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
369 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
372 #if FF_API_OLD_AUDIOCONVERT
373 #include "libavutil/audioconvert.h"
375 /* Audio channel masks */
376 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
377 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
378 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
379 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
380 #define CH_BACK_LEFT AV_CH_BACK_LEFT
381 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
382 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
383 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
384 #define CH_BACK_CENTER AV_CH_BACK_CENTER
385 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
386 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
387 #define CH_TOP_CENTER AV_CH_TOP_CENTER
388 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
389 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
390 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
391 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
392 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
393 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
394 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
395 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
397 /** Channel mask value used for AVCodecContext.request_channel_layout
398 to indicate that the user requests the channel order of the decoder output
399 to be the native codec channel order. */
400 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
402 /* Audio channel convenience macros */
403 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
404 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
405 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
406 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
407 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
408 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
409 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
410 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
411 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
412 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
413 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
414 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
415 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
416 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
417 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
421 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
424 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
425 * This is mainly needed because some optimized bitstream readers read
426 * 32 or 64 bit at once and could read over the end.<br>
427 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
428 * MPEG bitstreams could cause overread and segfault.
430 #define FF_INPUT_BUFFER_PADDING_SIZE 8
433 * minimum encoding buffer size
434 * Used to avoid some checks during header writing.
436 #define FF_MIN_BUFFER_SIZE 16384
440 * motion estimation type.
443 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
447 ME_EPZS, ///< enhanced predictive zonal search
448 ME_X1, ///< reserved for experiments
449 ME_HEX, ///< hexagon based search
450 ME_UMH, ///< uneven multi-hexagon search
451 ME_ITER, ///< iterative search
452 ME_TESA, ///< transformed exhaustive search algorithm
456 /* We leave some space between them for extensions (drop some
457 * keyframes for intra-only or drop just some bidir frames). */
458 AVDISCARD_NONE =-16, ///< discard nothing
459 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
460 AVDISCARD_NONREF = 8, ///< discard all non reference
461 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
462 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
463 AVDISCARD_ALL = 48, ///< discard all
466 enum AVColorPrimaries{
467 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
468 AVCOL_PRI_UNSPECIFIED=2,
470 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
471 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
472 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
474 AVCOL_PRI_NB , ///< Not part of ABI
477 enum AVColorTransferCharacteristic{
478 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
479 AVCOL_TRC_UNSPECIFIED=2,
480 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
481 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
482 AVCOL_TRC_NB , ///< Not part of ABI
487 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
488 AVCOL_SPC_UNSPECIFIED=2,
490 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
491 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
492 AVCOL_SPC_SMPTE240M =7,
493 AVCOL_SPC_NB , ///< Not part of ABI
497 AVCOL_RANGE_UNSPECIFIED=0,
498 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
499 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
500 AVCOL_RANGE_NB , ///< Not part of ABI
504 * X X 3 4 X X are luma samples,
505 * 1 2 1-6 are possible chroma positions
506 * X X 5 6 X 0 is undefined/unknown position
508 enum AVChromaLocation{
509 AVCHROMA_LOC_UNSPECIFIED=0,
510 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
511 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
512 AVCHROMA_LOC_TOPLEFT =3, ///< DV
514 AVCHROMA_LOC_BOTTOMLEFT =5,
515 AVCHROMA_LOC_BOTTOM =6,
516 AVCHROMA_LOC_NB , ///< Not part of ABI
523 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
524 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
525 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
526 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
527 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
528 AV_LPC_TYPE_NB , ///< Not part of ABI
531 enum AVAudioServiceType {
532 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
533 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
534 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
535 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
536 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
537 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
538 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
539 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
540 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
541 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
544 typedef struct RcOverride{
547 int qscale; // If this is 0 then quality_factor will be used instead.
548 float quality_factor;
551 #define FF_MAX_B_FRAMES 16
554 These flags can be passed in AVCodecContext.flags before initialization.
555 Note: Not everything is supported yet.
558 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
559 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
560 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
561 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
562 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
563 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
565 * The parent program guarantees that the input for B-frames containing
566 * streams is not written to for at least s->max_b_frames+1 frames, if
567 * this is not set the input will be copied.
569 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
570 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
571 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
572 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
573 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
574 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
575 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
576 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
577 location instead of only at frame boundaries. */
578 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
579 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
580 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
581 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
582 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
583 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
584 /* Fx : Flag for h263+ extra options */
585 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
586 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
587 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
588 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
589 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
590 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
591 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
592 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
593 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
594 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
595 #define CODEC_FLAG_CLOSED_GOP 0x80000000
596 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
597 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
598 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
599 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
600 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
601 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
602 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
603 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
604 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
605 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
606 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
607 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
608 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
609 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
610 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
611 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
612 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
613 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
614 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
615 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
616 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
617 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
619 /* Unsupported options :
620 * Syntax Arithmetic coding (SAC)
621 * Reference Picture Selection
622 * Independent Segment Decoding */
624 /* codec capabilities */
626 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
628 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
629 * If not set, it might not use get_buffer() at all or use operations that
630 * assume the buffer was allocated by avcodec_default_get_buffer.
632 #define CODEC_CAP_DR1 0x0002
633 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
634 #define CODEC_CAP_PARSE_ONLY 0x0004
635 #define CODEC_CAP_TRUNCATED 0x0008
636 /* Codec can export data for HW decoding (XvMC). */
637 #define CODEC_CAP_HWACCEL 0x0010
639 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
640 * If this is not set, the codec is guaranteed to never be fed with NULL data.
642 #define CODEC_CAP_DELAY 0x0020
644 * Codec can be fed a final frame with a smaller size.
645 * This can be used to prevent truncation of the last audio samples.
647 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
649 * Codec can export data for HW decoding (VDPAU).
651 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
653 * Codec can output multiple frames per AVPacket
654 * Normally demuxers return one frame at a time, demuxers which do not do
655 * are connected to a parser to split what they return into proper frames.
656 * This flag is reserved to the very rare category of codecs which have a
657 * bitstream that cannot be split into frames without timeconsuming
658 * operations like full decoding. Demuxers carring such bitstreams thus
659 * may return multiple frames in a packet. This has many disadvantages like
660 * prohibiting stream copy in many cases thus it should only be considered
663 #define CODEC_CAP_SUBFRAMES 0x0100
665 * Codec is experimental and is thus avoided in favor of non experimental
668 #define CODEC_CAP_EXPERIMENTAL 0x0200
670 * Codec should fill in channel configuration and samplerate instead of container
672 #define CODEC_CAP_CHANNEL_CONF 0x0400
675 * Codec is able to deal with negative linesizes
677 #define CODEC_CAP_NEG_LINESIZES 0x0800
680 * Codec supports frame-level multithreading.
682 #define CODEC_CAP_FRAME_THREADS 0x1000
684 * Codec supports slice-based (or partition-based) multithreading.
686 #define CODEC_CAP_SLICE_THREADS 0x2000
688 //The following defines may change, don't expect compatibility if you use them.
689 #define MB_TYPE_INTRA4x4 0x0001
690 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
691 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
692 #define MB_TYPE_16x16 0x0008
693 #define MB_TYPE_16x8 0x0010
694 #define MB_TYPE_8x16 0x0020
695 #define MB_TYPE_8x8 0x0040
696 #define MB_TYPE_INTERLACED 0x0080
697 #define MB_TYPE_DIRECT2 0x0100 //FIXME
698 #define MB_TYPE_ACPRED 0x0200
699 #define MB_TYPE_GMC 0x0400
700 #define MB_TYPE_SKIP 0x0800
701 #define MB_TYPE_P0L0 0x1000
702 #define MB_TYPE_P1L0 0x2000
703 #define MB_TYPE_P0L1 0x4000
704 #define MB_TYPE_P1L1 0x8000
705 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
706 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
707 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
708 #define MB_TYPE_QUANT 0x00010000
709 #define MB_TYPE_CBP 0x00020000
710 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
714 * This specifies the area which should be displayed.
715 * Note there may be multiple such areas for one frame.
717 typedef struct AVPanScan{
720 * - encoding: Set by user.
721 * - decoding: Set by libavcodec.
726 * width and height in 1/16 pel
727 * - encoding: Set by user.
728 * - decoding: Set by libavcodec.
734 * position of the top left corner in 1/16 pel for up to 3 fields/frames
735 * - encoding: Set by user.
736 * - decoding: Set by libavcodec.
738 int16_t position[3][2];
741 #define FF_COMMON_FRAME \
743 * pointer to the picture planes.\
744 * This might be different from the first allocated byte\
751 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
752 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
758 * 1 -> keyframe, 0-> not\
759 * - encoding: Set by libavcodec.\
760 * - decoding: Set by libavcodec.\
765 * Picture type of the frame, see ?_TYPE below.\
766 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
767 * - decoding: Set by libavcodec.\
772 * presentation timestamp in time_base units (time when frame should be shown to user)\
773 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
774 * - encoding: MUST be set by user.\
775 * - decoding: Set by libavcodec.\
780 * picture number in bitstream order\
781 * - encoding: set by\
782 * - decoding: Set by libavcodec.\
784 int coded_picture_number;\
786 * picture number in display order\
787 * - encoding: set by\
788 * - decoding: Set by libavcodec.\
790 int display_picture_number;\
793 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
794 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
795 * - decoding: Set by libavcodec.\
800 * buffer age (1->was last buffer and dint change, 2->..., ...).\
801 * Set to INT_MAX if the buffer has not been used yet.\
802 * - encoding: unused\
803 * - decoding: MUST be set by get_buffer().\
808 * is this picture used as reference\
809 * The values for this are the same as the MpegEncContext.picture_structure\
810 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
811 * Set to 4 for delayed, non-reference frames.\
812 * - encoding: unused\
813 * - decoding: Set by libavcodec. (before get_buffer() call)).\
819 * - encoding: unused\
820 * - decoding: Set by libavcodec.\
822 int8_t *qscale_table;\
825 * - encoding: unused\
826 * - decoding: Set by libavcodec.\
831 * mbskip_table[mb]>=1 if MB didn't change\
832 * stride= mb_width = (width+15)>>4\
833 * - encoding: unused\
834 * - decoding: Set by libavcodec.\
836 uint8_t *mbskip_table;\
839 * motion vector table\
842 * int mv_sample_log2= 4 - motion_subsample_log2;\
843 * int mb_width= (width+15)>>4;\
844 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
845 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
847 * - encoding: Set by user.\
848 * - decoding: Set by libavcodec.\
850 int16_t (*motion_val[2])[2];\
853 * macroblock type table\
854 * mb_type_base + mb_width + 2\
855 * - encoding: Set by user.\
856 * - decoding: Set by libavcodec.\
861 * log2 of the size of the block which a single vector in motion_val represents: \
862 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
863 * - encoding: unused\
864 * - decoding: Set by libavcodec.\
866 uint8_t motion_subsample_log2;\
869 * for some private data of the user\
870 * - encoding: unused\
871 * - decoding: Set by user.\
877 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
878 * - decoding: unused\
883 * type of the buffer (to keep track of who has to deallocate data[*])\
884 * - encoding: Set by the one who allocates it.\
885 * - decoding: Set by the one who allocates it.\
886 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
891 * When decoding, this signals how much the picture must be delayed.\
892 * extra_delay = repeat_pict / (2*fps)\
893 * - encoding: unused\
894 * - decoding: Set by libavcodec.\
904 * The content of the picture is interlaced.\
905 * - encoding: Set by user.\
906 * - decoding: Set by libavcodec. (default 0)\
908 int interlaced_frame;\
911 * If the content is interlaced, is top field displayed first.\
912 * - encoding: Set by user.\
913 * - decoding: Set by libavcodec.\
915 int top_field_first;\
919 * - encoding: Set by user.\
920 * - decoding: Set by libavcodec.\
922 AVPanScan *pan_scan;\
925 * Tell user application that palette has changed from previous frame.\
926 * - encoding: ??? (no palette-enabled encoder yet)\
927 * - decoding: Set by libavcodec. (default 0).\
929 int palette_has_changed;\
932 * codec suggestion on buffer type if != 0\
933 * - encoding: unused\
934 * - decoding: Set by libavcodec. (before get_buffer() call)).\
940 * - encoding: unused\
941 * - decoding: Set by libavcodec.\
946 * motion reference frame index\
947 * the order in which these are stored can depend on the codec.\
948 * - encoding: Set by user.\
949 * - decoding: Set by libavcodec.\
951 int8_t *ref_index[2];\
954 * reordered opaque 64bit (generally an integer or a double precision float\
955 * PTS but can be anything). \
956 * The user sets AVCodecContext.reordered_opaque to represent the input at\
958 * the decoder reorders values as needed and sets AVFrame.reordered_opaque\
959 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque \
960 * @deprecated in favor of pkt_pts\
961 * - encoding: unused\
962 * - decoding: Read by user.\
964 int64_t reordered_opaque;\
967 * hardware accelerator private data (FFmpeg allocated)\
968 * - encoding: unused\
969 * - decoding: Set by libavcodec\
971 void *hwaccel_picture_private;\
974 * reordered pts from the last AVPacket that has been input into the decoder\
975 * - encoding: unused\
976 * - decoding: Read by user.\
981 * dts from the last AVPacket that has been input into the decoder\
982 * - encoding: unused\
983 * - decoding: Read by user.\
988 * the AVCodecContext which ff_thread_get_buffer() was last called on\
989 * - encoding: Set by libavcodec.\
990 * - decoding: Set by libavcodec.\
992 struct AVCodecContext *owner;\
995 * used by multithreading to store frame-specific info\
996 * - encoding: Set by libavcodec.\
997 * - decoding: Set by libavcodec.\
999 void *thread_opaque;\
1002 * frame timestamp estimated using various heuristics, in stream time base\
1003 * - encoding: unused\
1004 * - decoding: set by libavcodec, read by user.\
1006 int64_t best_effort_timestamp;\
1009 #define FF_QSCALE_TYPE_MPEG1 0
1010 #define FF_QSCALE_TYPE_MPEG2 1
1011 #define FF_QSCALE_TYPE_H264 2
1012 #define FF_QSCALE_TYPE_VP56 3
1014 #define FF_BUFFER_TYPE_INTERNAL 1
1015 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1016 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1017 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1020 #define FF_I_TYPE 1 ///< Intra
1021 #define FF_P_TYPE 2 ///< Predicted
1022 #define FF_B_TYPE 3 ///< Bi-dir predicted
1023 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
1024 #define FF_SI_TYPE 5 ///< Switching Intra
1025 #define FF_SP_TYPE 6 ///< Switching Predicted
1026 #define FF_BI_TYPE 7
1028 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1029 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1030 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1031 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1033 enum AVPacketSideDataType {
1034 AV_PKT_DATA_PALETTE,
1037 typedef struct AVPacket {
1039 * Presentation timestamp in AVStream->time_base units; the time at which
1040 * the decompressed packet will be presented to the user.
1041 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1042 * pts MUST be larger or equal to dts as presentation cannot happen before
1043 * decompression, unless one wants to view hex dumps. Some formats misuse
1044 * the terms dts and pts/cts to mean something different. Such timestamps
1045 * must be converted to true pts/dts before they are stored in AVPacket.
1049 * Decompression timestamp in AVStream->time_base units; the time at which
1050 * the packet is decompressed.
1051 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1059 * Additional packet data that can be provided by the container.
1060 * Packet can contain several types of side information.
1065 enum AVPacketSideDataType type;
1067 int side_data_elems;
1070 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1071 * Equals next_pts - this_pts in presentation order.
1074 void (*destruct)(struct AVPacket *);
1076 int64_t pos; ///< byte position in stream, -1 if unknown
1079 * Time difference in AVStream->time_base units from the pts of this
1080 * packet to the point at which the output from the decoder has converged
1081 * independent from the availability of previous frames. That is, the
1082 * frames are virtually identical no matter if decoding started from
1083 * the very first frame or from this keyframe.
1084 * Is AV_NOPTS_VALUE if unknown.
1085 * This field is not the display duration of the current packet.
1086 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1089 * The purpose of this field is to allow seeking in streams that have no
1090 * keyframes in the conventional sense. It corresponds to the
1091 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1092 * essential for some types of subtitle streams to ensure that all
1093 * subtitles are correctly displayed after seeking.
1095 int64_t convergence_duration;
1097 #define AV_PKT_FLAG_KEY 0x0001
1100 * Audio Video Frame.
1101 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1103 * Removal, reordering and changes to existing fields require a major
1104 * version bump. No fields should be added into AVFrame before or after
1106 * sizeof(AVFrame) must not be used outside libav*.
1108 typedef struct AVFrame {
1113 * main external API structure.
1114 * New fields can be added to the end with minor version bumps.
1115 * Removal, reordering and changes to existing fields require a major
1117 * sizeof(AVCodecContext) must not be used outside libav*.
1119 typedef struct AVCodecContext {
1121 * information on struct for av_log
1122 * - set by avcodec_alloc_context
1124 const AVClass *av_class;
1126 * the average bitrate
1127 * - encoding: Set by user; unused for constant quantizer encoding.
1128 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1133 * number of bits the bitstream is allowed to diverge from the reference.
1134 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1135 * - encoding: Set by user; unused for constant quantizer encoding.
1136 * - decoding: unused
1138 int bit_rate_tolerance;
1142 * - encoding: Set by user.
1143 * - decoding: Set by user.
1148 * Some codecs need additional format info. It is stored here.
1149 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1150 * specific codec MUST set it correctly otherwise stream copy breaks.
1151 * In general use of this field by muxers is not recommanded.
1152 * - encoding: Set by libavcodec.
1153 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1158 * Motion estimation algorithm used for video coding.
1159 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1160 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1161 * - encoding: MUST be set by user.
1162 * - decoding: unused
1167 * some codecs need / can use extradata like Huffman tables.
1168 * mjpeg: Huffman tables
1169 * rv10: additional flags
1170 * mpeg4: global headers (they can be in the bitstream or here)
1171 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1172 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1173 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1174 * - encoding: Set/allocated/freed by libavcodec.
1175 * - decoding: Set/allocated/freed by user.
1181 * This is the fundamental unit of time (in seconds) in terms
1182 * of which frame timestamps are represented. For fixed-fps content,
1183 * timebase should be 1/framerate and timestamp increments should be
1185 * - encoding: MUST be set by user.
1186 * - decoding: Set by libavcodec.
1188 AVRational time_base;
1192 * picture width / height.
1193 * - encoding: MUST be set by user.
1194 * - decoding: Set by libavcodec.
1195 * Note: For compatibility it is possible to set this instead of
1196 * coded_width/height before decoding.
1200 #define FF_ASPECT_EXTENDED 15
1203 * the number of pictures in a group of pictures, or 0 for intra_only
1204 * - encoding: Set by user.
1205 * - decoding: unused
1210 * Pixel format, see PIX_FMT_xxx.
1211 * May be set by the demuxer if known from headers.
1212 * May be overriden by the decoder if it knows better.
1213 * - encoding: Set by user.
1214 * - decoding: Set by user if known, overridden by libavcodec if known
1216 enum PixelFormat pix_fmt;
1220 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1221 * has to read frames at native frame rate.
1222 * - encoding: Set by user.
1223 * - decoding: unused
1225 attribute_deprecated int rate_emu;
1229 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1230 * decoder to draw a horizontal band. It improves cache usage. Not
1231 * all codecs can do that. You must check the codec capabilities
1233 * When multithreading is used, it may be called from multiple threads
1234 * at the same time; threads might draw different parts of the same AVFrame,
1235 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1237 * The function is also used by hardware acceleration APIs.
1238 * It is called at least once during frame decoding to pass
1239 * the data needed for hardware render.
1240 * In that mode instead of pixel data, AVFrame points to
1241 * a structure specific to the acceleration API. The application
1242 * reads the structure and can change some fields to indicate progress
1244 * - encoding: unused
1245 * - decoding: Set by user.
1246 * @param height the height of the slice
1247 * @param y the y position of the slice
1248 * @param type 1->top field, 2->bottom field, 3->frame
1249 * @param offset offset into the AVFrame.data from which the slice should be read
1251 void (*draw_horiz_band)(struct AVCodecContext *s,
1252 const AVFrame *src, int offset[4],
1253 int y, int type, int height);
1256 int sample_rate; ///< samples per second
1257 int channels; ///< number of audio channels
1260 * audio sample format
1261 * - encoding: Set by user.
1262 * - decoding: Set by libavcodec.
1264 enum AVSampleFormat sample_fmt; ///< sample format
1266 /* The following data should not be initialized. */
1268 * Samples per packet, initialized when calling 'init'.
1271 int frame_number; ///< audio or video frame number
1274 * Number of frames the decoded output will be delayed relative to
1275 * the encoded input.
1276 * - encoding: Set by libavcodec.
1277 * - decoding: unused
1281 /* - encoding parameters */
1282 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1283 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1287 * - encoding: Set by user.
1288 * - decoding: unused
1294 * - encoding: Set by user.
1295 * - decoding: unused
1300 * maximum quantizer difference between frames
1301 * - encoding: Set by user.
1302 * - decoding: unused
1307 * maximum number of B-frames between non-B-frames
1308 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1309 * - encoding: Set by user.
1310 * - decoding: unused
1315 * qscale factor between IP and B-frames
1316 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1317 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1318 * - encoding: Set by user.
1319 * - decoding: unused
1321 float b_quant_factor;
1323 /** obsolete FIXME remove */
1325 #define FF_RC_STRATEGY_XVID 1
1327 int b_frame_strategy;
1332 * - encoding: unused
1333 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1334 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1336 attribute_deprecated int hurry_up;
1339 struct AVCodec *codec;
1343 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1344 /* do its best to deliver a chunk with size */
1345 /* below rtp_payload_size, the chunk will start */
1346 /* with a start code on some codecs like H.263. */
1347 /* This doesn't take account of any particular */
1348 /* headers inside the transmitted RTP payload. */
1351 /* The RTP callback: This function is called */
1352 /* every time the encoder has a packet to send. */
1353 /* It depends on the encoder if the data starts */
1354 /* with a Start Code (it should). H.263 does. */
1355 /* mb_nb contains the number of macroblocks */
1356 /* encoded in the RTP payload. */
1357 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1359 /* statistics, used for 2-pass encoding */
1370 * number of bits used for the previously encoded frame
1371 * - encoding: Set by libavcodec.
1372 * - decoding: unused
1377 * Private data of the user, can be used to carry app specific stuff.
1378 * - encoding: Set by user.
1379 * - decoding: Set by user.
1383 char codec_name[32];
1384 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1385 enum CodecID codec_id; /* see CODEC_ID_xxx */
1388 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1389 * This is used to work around some encoder bugs.
1390 * A demuxer should set this to what is stored in the field used to identify the codec.
1391 * If there are multiple such fields in a container then the demuxer should choose the one
1392 * which maximizes the information about the used codec.
1393 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1394 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1395 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1397 * - encoding: Set by user, if not then the default based on codec_id will be used.
1398 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1400 unsigned int codec_tag;
1403 * Work around bugs in encoders which sometimes cannot be detected automatically.
1404 * - encoding: Set by user
1405 * - decoding: Set by user
1407 int workaround_bugs;
1408 #define FF_BUG_AUTODETECT 1 ///< autodetection
1409 #define FF_BUG_OLD_MSMPEG4 2
1410 #define FF_BUG_XVID_ILACE 4
1411 #define FF_BUG_UMP4 8
1412 #define FF_BUG_NO_PADDING 16
1413 #define FF_BUG_AMV 32
1414 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1415 #define FF_BUG_QPEL_CHROMA 64
1416 #define FF_BUG_STD_QPEL 128
1417 #define FF_BUG_QPEL_CHROMA2 256
1418 #define FF_BUG_DIRECT_BLOCKSIZE 512
1419 #define FF_BUG_EDGE 1024
1420 #define FF_BUG_HPEL_CHROMA 2048
1421 #define FF_BUG_DC_CLIP 4096
1422 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1423 #define FF_BUG_TRUNCATED 16384
1424 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1427 * luma single coefficient elimination threshold
1428 * - encoding: Set by user.
1429 * - decoding: unused
1431 int luma_elim_threshold;
1434 * chroma single coeff elimination threshold
1435 * - encoding: Set by user.
1436 * - decoding: unused
1438 int chroma_elim_threshold;
1441 * strictly follow the standard (MPEG4, ...).
1442 * - encoding: Set by user.
1443 * - decoding: Set by user.
1444 * Setting this to STRICT or higher means the encoder and decoder will
1445 * generally do stupid things, whereas setting it to unofficial or lower
1446 * will mean the encoder might produce output that is not supported by all
1447 * spec-compliant decoders. Decoders don't differentiate between normal,
1448 * unofficial and experimental (that is, they always try to decode things
1449 * when they can) unless they are explicitly asked to behave stupidly
1450 * (=strictly conform to the specs)
1452 int strict_std_compliance;
1453 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1454 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1455 #define FF_COMPLIANCE_NORMAL 0
1456 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1457 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1460 * qscale offset between IP and B-frames
1461 * - encoding: Set by user.
1462 * - decoding: unused
1464 float b_quant_offset;
1467 * Error recognization; higher values will detect more errors but may
1468 * misdetect some more or less valid parts as errors.
1469 * - encoding: unused
1470 * - decoding: Set by user.
1472 int error_recognition;
1473 #define FF_ER_CAREFUL 1
1474 #define FF_ER_COMPLIANT 2
1475 #define FF_ER_AGGRESSIVE 3
1476 #define FF_ER_VERY_AGGRESSIVE 4
1479 * Called at the beginning of each frame to get a buffer for it.
1480 * If pic.reference is set then the frame will be read later by libavcodec.
1481 * avcodec_align_dimensions2() should be used to find the required width and
1482 * height, as they normally need to be rounded up to the next multiple of 16.
1483 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1484 * avcodec_default_get_buffer() instead of providing buffers allocated by
1486 * If frame multithreading is used and thread_safe_callbacks is set,
1487 * it may be called from a different thread, but not from more than one at once.
1488 * Does not need to be reentrant.
1489 * - encoding: unused
1490 * - decoding: Set by libavcodec, user can override.
1492 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1495 * Called to release buffers which were allocated with get_buffer.
1496 * A released buffer can be reused in get_buffer().
1497 * pic.data[*] must be set to NULL.
1498 * May be called from a different thread if frame multithreading is used,
1499 * but not by more than one thread at once, so does not need to be reentrant.
1500 * - encoding: unused
1501 * - decoding: Set by libavcodec, user can override.
1503 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1506 * Size of the frame reordering buffer in the decoder.
1507 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1508 * - encoding: Set by libavcodec.
1509 * - decoding: Set by libavcodec.
1514 * number of bytes per packet if constant and known or 0
1515 * Used by some WAV based audio codecs.
1519 int parse_only; /* - decoding only: If true, only parsing is done
1520 (function avcodec_parse_frame()). The frame
1521 data is returned. Only MPEG codecs support this now. */
1524 * 0-> h263 quant 1-> mpeg quant
1525 * - encoding: Set by user.
1526 * - decoding: unused
1531 * pass1 encoding statistics output buffer
1532 * - encoding: Set by libavcodec.
1533 * - decoding: unused
1538 * pass2 encoding statistics input buffer
1539 * Concatenated stuff from stats_out of pass1 should be placed here.
1540 * - encoding: Allocated/set/freed by user.
1541 * - decoding: unused
1546 * ratecontrol qmin qmax limiting method
1547 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1548 * - encoding: Set by user.
1549 * - decoding: unused
1557 * ratecontrol override, see RcOverride
1558 * - encoding: Allocated/set/freed by user.
1559 * - decoding: unused
1561 RcOverride *rc_override;
1562 int rc_override_count;
1565 * rate control equation
1566 * - encoding: Set by user
1567 * - decoding: unused
1573 * - encoding: Set by user.
1574 * - decoding: unused
1580 * - encoding: Set by user.
1581 * - decoding: unused
1586 * decoder bitstream buffer size
1587 * - encoding: Set by user.
1588 * - decoding: unused
1591 float rc_buffer_aggressivity;
1594 * qscale factor between P and I-frames
1595 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1596 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1597 * - encoding: Set by user.
1598 * - decoding: unused
1600 float i_quant_factor;
1603 * qscale offset between P and I-frames
1604 * - encoding: Set by user.
1605 * - decoding: unused
1607 float i_quant_offset;
1610 * initial complexity for pass1 ratecontrol
1611 * - encoding: Set by user.
1612 * - decoding: unused
1614 float rc_initial_cplx;
1617 * DCT algorithm, see FF_DCT_* below
1618 * - encoding: Set by user.
1619 * - decoding: unused
1622 #define FF_DCT_AUTO 0
1623 #define FF_DCT_FASTINT 1
1624 #define FF_DCT_INT 2
1625 #define FF_DCT_MMX 3
1626 #define FF_DCT_MLIB 4
1627 #define FF_DCT_ALTIVEC 5
1628 #define FF_DCT_FAAN 6
1631 * luminance masking (0-> disabled)
1632 * - encoding: Set by user.
1633 * - decoding: unused
1638 * temporary complexity masking (0-> disabled)
1639 * - encoding: Set by user.
1640 * - decoding: unused
1642 float temporal_cplx_masking;
1645 * spatial complexity masking (0-> disabled)
1646 * - encoding: Set by user.
1647 * - decoding: unused
1649 float spatial_cplx_masking;
1652 * p block masking (0-> disabled)
1653 * - encoding: Set by user.
1654 * - decoding: unused
1659 * darkness masking (0-> disabled)
1660 * - encoding: Set by user.
1661 * - decoding: unused
1666 * IDCT algorithm, see FF_IDCT_* below.
1667 * - encoding: Set by user.
1668 * - decoding: Set by user.
1671 #define FF_IDCT_AUTO 0
1672 #define FF_IDCT_INT 1
1673 #define FF_IDCT_SIMPLE 2
1674 #define FF_IDCT_SIMPLEMMX 3
1675 #define FF_IDCT_LIBMPEG2MMX 4
1676 #define FF_IDCT_PS2 5
1677 #define FF_IDCT_MLIB 6
1678 #define FF_IDCT_ARM 7
1679 #define FF_IDCT_ALTIVEC 8
1680 #define FF_IDCT_SH4 9
1681 #define FF_IDCT_SIMPLEARM 10
1682 #define FF_IDCT_H264 11
1683 #define FF_IDCT_VP3 12
1684 #define FF_IDCT_IPP 13
1685 #define FF_IDCT_XVIDMMX 14
1686 #define FF_IDCT_CAVS 15
1687 #define FF_IDCT_SIMPLEARMV5TE 16
1688 #define FF_IDCT_SIMPLEARMV6 17
1689 #define FF_IDCT_SIMPLEVIS 18
1690 #define FF_IDCT_WMV2 19
1691 #define FF_IDCT_FAAN 20
1692 #define FF_IDCT_EA 21
1693 #define FF_IDCT_SIMPLENEON 22
1694 #define FF_IDCT_SIMPLEALPHA 23
1695 #define FF_IDCT_BINK 24
1699 * - encoding: Set by libavcodec.
1700 * - decoding: Set by user (or 0).
1704 * slice offsets in the frame in bytes
1705 * - encoding: Set/allocated by libavcodec.
1706 * - decoding: Set/allocated by user (or NULL).
1711 * error concealment flags
1712 * - encoding: unused
1713 * - decoding: Set by user.
1715 int error_concealment;
1716 #define FF_EC_GUESS_MVS 1
1717 #define FF_EC_DEBLOCK 2
1720 * dsp_mask could be add used to disable unwanted CPU features
1721 * CPU features (i.e. MMX, SSE. ...)
1723 * With the FORCE flag you may instead enable given CPU features.
1724 * (Dangerous: Usable in case of misdetection, improper usage however will
1725 * result into program crash.)
1730 * bits per sample/pixel from the demuxer (needed for huffyuv).
1731 * - encoding: Set by libavcodec.
1732 * - decoding: Set by user.
1734 int bits_per_coded_sample;
1737 * prediction method (needed for huffyuv)
1738 * - encoding: Set by user.
1739 * - decoding: unused
1741 int prediction_method;
1742 #define FF_PRED_LEFT 0
1743 #define FF_PRED_PLANE 1
1744 #define FF_PRED_MEDIAN 2
1747 * sample aspect ratio (0 if unknown)
1748 * That is the width of a pixel divided by the height of the pixel.
1749 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1750 * - encoding: Set by user.
1751 * - decoding: Set by libavcodec.
1753 AVRational sample_aspect_ratio;
1756 * the picture in the bitstream
1757 * - encoding: Set by libavcodec.
1758 * - decoding: Set by libavcodec.
1760 AVFrame *coded_frame;
1764 * - encoding: Set by user.
1765 * - decoding: Set by user.
1768 #define FF_DEBUG_PICT_INFO 1
1769 #define FF_DEBUG_RC 2
1770 #define FF_DEBUG_BITSTREAM 4
1771 #define FF_DEBUG_MB_TYPE 8
1772 #define FF_DEBUG_QP 16
1773 #define FF_DEBUG_MV 32
1774 #define FF_DEBUG_DCT_COEFF 0x00000040
1775 #define FF_DEBUG_SKIP 0x00000080
1776 #define FF_DEBUG_STARTCODE 0x00000100
1777 #define FF_DEBUG_PTS 0x00000200
1778 #define FF_DEBUG_ER 0x00000400
1779 #define FF_DEBUG_MMCO 0x00000800
1780 #define FF_DEBUG_BUGS 0x00001000
1781 #define FF_DEBUG_VIS_QP 0x00002000
1782 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1783 #define FF_DEBUG_BUFFERS 0x00008000
1784 #define FF_DEBUG_THREADS 0x00010000
1788 * - encoding: Set by user.
1789 * - decoding: Set by user.
1792 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1793 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1794 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1798 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1799 * - decoding: unused
1805 * minimum MB quantizer
1806 * - encoding: unused
1807 * - decoding: unused
1809 attribute_deprecated int mb_qmin;
1812 * maximum MB quantizer
1813 * - encoding: unused
1814 * - decoding: unused
1816 attribute_deprecated int mb_qmax;
1820 * motion estimation comparison function
1821 * - encoding: Set by user.
1822 * - decoding: unused
1826 * subpixel motion estimation comparison function
1827 * - encoding: Set by user.
1828 * - decoding: unused
1832 * macroblock comparison function (not supported yet)
1833 * - encoding: Set by user.
1834 * - decoding: unused
1838 * interlaced DCT comparison function
1839 * - encoding: Set by user.
1840 * - decoding: unused
1843 #define FF_CMP_SAD 0
1844 #define FF_CMP_SSE 1
1845 #define FF_CMP_SATD 2
1846 #define FF_CMP_DCT 3
1847 #define FF_CMP_PSNR 4
1848 #define FF_CMP_BIT 5
1850 #define FF_CMP_ZERO 7
1851 #define FF_CMP_VSAD 8
1852 #define FF_CMP_VSSE 9
1853 #define FF_CMP_NSSE 10
1854 #define FF_CMP_W53 11
1855 #define FF_CMP_W97 12
1856 #define FF_CMP_DCTMAX 13
1857 #define FF_CMP_DCT264 14
1858 #define FF_CMP_CHROMA 256
1861 * ME diamond size & shape
1862 * - encoding: Set by user.
1863 * - decoding: unused
1868 * amount of previous MV predictors (2a+1 x 2a+1 square)
1869 * - encoding: Set by user.
1870 * - decoding: unused
1872 int last_predictor_count;
1875 * prepass for motion estimation
1876 * - encoding: Set by user.
1877 * - decoding: unused
1882 * motion estimation prepass comparison function
1883 * - encoding: Set by user.
1884 * - decoding: unused
1889 * ME prepass diamond size & shape
1890 * - encoding: Set by user.
1891 * - decoding: unused
1897 * - encoding: Set by user.
1898 * - decoding: unused
1900 int me_subpel_quality;
1903 * callback to negotiate the pixelFormat
1904 * @param fmt is the list of formats which are supported by the codec,
1905 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1906 * The first is always the native one.
1907 * @return the chosen format
1908 * - encoding: unused
1909 * - decoding: Set by user, if not set the native format will be chosen.
1911 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1914 * DTG active format information (additional aspect ratio
1915 * information only used in DVB MPEG-2 transport streams)
1918 * - encoding: unused
1919 * - decoding: Set by decoder.
1921 int dtg_active_format;
1922 #define FF_DTG_AFD_SAME 8
1923 #define FF_DTG_AFD_4_3 9
1924 #define FF_DTG_AFD_16_9 10
1925 #define FF_DTG_AFD_14_9 11
1926 #define FF_DTG_AFD_4_3_SP_14_9 13
1927 #define FF_DTG_AFD_16_9_SP_14_9 14
1928 #define FF_DTG_AFD_SP_4_3 15
1931 * maximum motion estimation search range in subpel units
1932 * If 0 then no limit.
1934 * - encoding: Set by user.
1935 * - decoding: unused
1940 * intra quantizer bias
1941 * - encoding: Set by user.
1942 * - decoding: unused
1944 int intra_quant_bias;
1945 #define FF_DEFAULT_QUANT_BIAS 999999
1948 * inter quantizer bias
1949 * - encoding: Set by user.
1950 * - decoding: unused
1952 int inter_quant_bias;
1956 * - encoding: unused
1957 * - decoding: Which clrtable should be used for 8bit RGB images.
1958 * Tables have to be stored somewhere. FIXME
1963 * internal_buffer count
1964 * Don't touch, used by libavcodec default_get_buffer().
1966 int internal_buffer_count;
1970 * Don't touch, used by libavcodec default_get_buffer().
1972 void *internal_buffer;
1975 * Global quality for codecs which cannot change it per frame.
1976 * This should be proportional to MPEG-1/2/4 qscale.
1977 * - encoding: Set by user.
1978 * - decoding: unused
1982 #define FF_CODER_TYPE_VLC 0
1983 #define FF_CODER_TYPE_AC 1
1984 #define FF_CODER_TYPE_RAW 2
1985 #define FF_CODER_TYPE_RLE 3
1986 #define FF_CODER_TYPE_DEFLATE 4
1989 * - encoding: Set by user.
1990 * - decoding: unused
1996 * - encoding: Set by user.
1997 * - decoding: unused
2003 * - encoding: unused
2004 * - decoding: Set by user.
2006 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2011 * - encoding: unused
2012 * - decoding: Set by user.
2015 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2016 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2017 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2020 * XVideo Motion Acceleration
2021 * - encoding: forbidden
2022 * - decoding: set by decoder
2024 int xvmc_acceleration;
2027 * macroblock decision mode
2028 * - encoding: Set by user.
2029 * - decoding: unused
2032 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2033 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2034 #define FF_MB_DECISION_RD 2 ///< rate distortion
2037 * custom intra quantization matrix
2038 * - encoding: Set by user, can be NULL.
2039 * - decoding: Set by libavcodec.
2041 uint16_t *intra_matrix;
2044 * custom inter quantization matrix
2045 * - encoding: Set by user, can be NULL.
2046 * - decoding: Set by libavcodec.
2048 uint16_t *inter_matrix;
2051 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2052 * This is used to work around some encoder bugs.
2053 * - encoding: unused
2054 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2056 unsigned int stream_codec_tag;
2059 * scene change detection threshold
2060 * 0 is default, larger means fewer detected scene changes.
2061 * - encoding: Set by user.
2062 * - decoding: unused
2064 int scenechange_threshold;
2067 * minimum Lagrange multipler
2068 * - encoding: Set by user.
2069 * - decoding: unused
2074 * maximum Lagrange multipler
2075 * - encoding: Set by user.
2076 * - decoding: unused
2080 #if FF_API_PALETTE_CONTROL
2082 * palette control structure
2083 * - encoding: ??? (no palette-enabled encoder yet)
2084 * - decoding: Set by user.
2086 struct AVPaletteControl *palctrl;
2090 * noise reduction strength
2091 * - encoding: Set by user.
2092 * - decoding: unused
2094 int noise_reduction;
2097 * Called at the beginning of a frame to get cr buffer for it.
2098 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2099 * libavcodec will pass previous buffer in pic, function should return
2100 * same buffer or new buffer with old frame "painted" into it.
2101 * If pic.data[0] == NULL must behave like get_buffer().
2102 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2103 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2105 * - encoding: unused
2106 * - decoding: Set by libavcodec, user can override.
2108 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2111 * Number of bits which should be loaded into the rc buffer before decoding starts.
2112 * - encoding: Set by user.
2113 * - decoding: unused
2115 int rc_initial_buffer_occupancy;
2119 * - encoding: Set by user.
2120 * - decoding: unused
2122 int inter_threshold;
2126 * - encoding: Set by user.
2127 * - decoding: Set by user.
2132 * Simulates errors in the bitstream to test error concealment.
2133 * - encoding: Set by user.
2134 * - decoding: unused
2138 #if FF_API_ANTIALIAS_ALGO
2140 * MP3 antialias algorithm, see FF_AA_* below.
2141 * - encoding: unused
2142 * - decoding: Set by user.
2144 attribute_deprecated int antialias_algo;
2145 #define FF_AA_AUTO 0
2146 #define FF_AA_FASTINT 1 //not implemented yet
2148 #define FF_AA_FLOAT 3
2152 * quantizer noise shaping
2153 * - encoding: Set by user.
2154 * - decoding: unused
2156 int quantizer_noise_shaping;
2160 * is used to decide how many independent tasks should be passed to execute()
2161 * - encoding: Set by user.
2162 * - decoding: Set by user.
2167 * The codec may call this to execute several independent things.
2168 * It will return only after finishing all tasks.
2169 * The user may replace this with some multithreaded implementation,
2170 * the default implementation will execute the parts serially.
2171 * @param count the number of things to execute
2172 * - encoding: Set by libavcodec, user can override.
2173 * - decoding: Set by libavcodec, user can override.
2175 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2179 * Can be used by execute() to store some per AVCodecContext stuff.
2180 * - encoding: set by execute()
2181 * - decoding: set by execute()
2183 void *thread_opaque;
2186 * Motion estimation threshold below which no motion estimation is
2187 * performed, but instead the user specified motion vectors are used.
2189 * - encoding: Set by user.
2190 * - decoding: unused
2195 * Macroblock threshold below which the user specified macroblock types will be used.
2196 * - encoding: Set by user.
2197 * - decoding: unused
2202 * precision of the intra DC coefficient - 8
2203 * - encoding: Set by user.
2204 * - decoding: unused
2206 int intra_dc_precision;
2209 * noise vs. sse weight for the nsse comparsion function
2210 * - encoding: Set by user.
2211 * - decoding: unused
2216 * Number of macroblock rows at the top which are skipped.
2217 * - encoding: unused
2218 * - decoding: Set by user.
2223 * Number of macroblock rows at the bottom which are skipped.
2224 * - encoding: unused
2225 * - decoding: Set by user.
2231 * - encoding: Set by user.
2232 * - decoding: Set by libavcodec.
2235 #define FF_PROFILE_UNKNOWN -99
2236 #define FF_PROFILE_RESERVED -100
2238 #define FF_PROFILE_AAC_MAIN 0
2239 #define FF_PROFILE_AAC_LOW 1
2240 #define FF_PROFILE_AAC_SSR 2
2241 #define FF_PROFILE_AAC_LTP 3
2243 #define FF_PROFILE_DTS 20
2244 #define FF_PROFILE_DTS_ES 30
2245 #define FF_PROFILE_DTS_96_24 40
2246 #define FF_PROFILE_DTS_HD_HRA 50
2247 #define FF_PROFILE_DTS_HD_MA 60
2249 #define FF_PROFILE_MPEG2_422 0
2250 #define FF_PROFILE_MPEG2_HIGH 1
2251 #define FF_PROFILE_MPEG2_SS 2
2252 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2253 #define FF_PROFILE_MPEG2_MAIN 4
2254 #define FF_PROFILE_MPEG2_SIMPLE 5
2256 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2257 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2259 #define FF_PROFILE_H264_BASELINE 66
2260 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2261 #define FF_PROFILE_H264_MAIN 77
2262 #define FF_PROFILE_H264_EXTENDED 88
2263 #define FF_PROFILE_H264_HIGH 100
2264 #define FF_PROFILE_H264_HIGH_10 110
2265 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2266 #define FF_PROFILE_H264_HIGH_422 122
2267 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2268 #define FF_PROFILE_H264_HIGH_444 144
2269 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2270 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2271 #define FF_PROFILE_H264_CAVLC_444 44
2273 #define FF_PROFILE_VC1_SIMPLE 0
2274 #define FF_PROFILE_VC1_MAIN 1
2275 #define FF_PROFILE_VC1_COMPLEX 2
2276 #define FF_PROFILE_VC1_ADVANCED 3
2280 * - encoding: Set by user.
2281 * - decoding: Set by libavcodec.
2284 #define FF_LEVEL_UNKNOWN -99
2287 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2288 * - encoding: unused
2289 * - decoding: Set by user.
2294 * Bitstream width / height, may be different from width/height if lowres
2295 * or other things are used.
2296 * - encoding: unused
2297 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2299 int coded_width, coded_height;
2302 * frame skip threshold
2303 * - encoding: Set by user.
2304 * - decoding: unused
2306 int frame_skip_threshold;
2310 * - encoding: Set by user.
2311 * - decoding: unused
2313 int frame_skip_factor;
2316 * frame skip exponent
2317 * - encoding: Set by user.
2318 * - decoding: unused
2323 * frame skip comparison function
2324 * - encoding: Set by user.
2325 * - decoding: unused
2330 * Border processing masking, raises the quantizer for mbs on the borders
2332 * - encoding: Set by user.
2333 * - decoding: unused
2335 float border_masking;
2338 * minimum MB lagrange multipler
2339 * - encoding: Set by user.
2340 * - decoding: unused
2345 * maximum MB lagrange multipler
2346 * - encoding: Set by user.
2347 * - decoding: unused
2353 * - encoding: Set by user.
2354 * - decoding: unused
2356 int me_penalty_compensation;
2360 * - encoding: unused
2361 * - decoding: Set by user.
2363 enum AVDiscard skip_loop_filter;
2367 * - encoding: unused
2368 * - decoding: Set by user.
2370 enum AVDiscard skip_idct;
2374 * - encoding: unused
2375 * - decoding: Set by user.
2377 enum AVDiscard skip_frame;
2381 * - encoding: Set by user.
2382 * - decoding: unused
2388 * - encoding: Set by user.
2389 * - decoding: unused
2394 * constant rate factor - quality-based VBR - values ~correspond to qps
2395 * - encoding: Set by user.
2396 * - decoding: unused
2401 * constant quantization parameter rate control method
2402 * - encoding: Set by user.
2403 * - decoding: unused
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 * LPC coefficient precision - used by FLAC encoder
2522 * - encoding: Set by user.
2523 * - decoding: unused
2525 int lpc_coeff_precision;
2528 * - encoding: Set by user.
2529 * - decoding: unused
2531 int min_prediction_order;
2534 * - encoding: Set by user.
2535 * - decoding: unused
2537 int max_prediction_order;
2540 * search method for selecting prediction order
2541 * - encoding: Set by user.
2542 * - decoding: unused
2544 int prediction_order_method;
2547 * - encoding: Set by user.
2548 * - decoding: unused
2550 int min_partition_order;
2553 * - encoding: Set by user.
2554 * - decoding: unused
2556 int max_partition_order;
2559 * GOP timecode frame start number, in non drop frame format
2560 * - encoding: Set by user.
2561 * - decoding: unused
2563 int64_t timecode_frame_start;
2565 #if FF_API_REQUEST_CHANNELS
2567 * Decoder should decode to this many channels if it can (0 for default)
2568 * - encoding: unused
2569 * - decoding: Set by user.
2570 * @deprecated Deprecated in favor of request_channel_layout.
2572 int request_channels;
2576 * Percentage of dynamic range compression to be applied by the decoder.
2577 * The default value is 1.0, corresponding to full compression.
2578 * - encoding: unused
2579 * - decoding: Set by user.
2584 * opaque 64bit number (generally a PTS) that will be reordered and
2585 * output in AVFrame.reordered_opaque
2586 * @deprecated in favor of pkt_pts
2587 * - encoding: unused
2588 * - decoding: Set by user.
2590 int64_t reordered_opaque;
2593 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2594 * This field is applicable only when sample_fmt is AV_SAMPLE_FMT_S32.
2595 * - encoding: set by user.
2596 * - decoding: set by libavcodec.
2598 int bits_per_raw_sample;
2601 * Audio channel layout.
2602 * - encoding: set by user.
2603 * - decoding: set by libavcodec.
2605 int64_t channel_layout;
2608 * Request decoder to use this channel layout if it can (0 for default)
2609 * - encoding: unused
2610 * - decoding: Set by user.
2612 int64_t request_channel_layout;
2615 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2616 * - encoding: Set by user.
2617 * - decoding: unused.
2619 float rc_max_available_vbv_use;
2622 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2623 * - encoding: Set by user.
2624 * - decoding: unused.
2626 float rc_min_vbv_overflow_use;
2629 * Hardware accelerator in use
2630 * - encoding: unused.
2631 * - decoding: Set by libavcodec
2633 struct AVHWAccel *hwaccel;
2636 * For some codecs, the time base is closer to the field rate than the frame rate.
2637 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2638 * if no telecine is used ...
2640 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2642 int ticks_per_frame;
2645 * Hardware accelerator context.
2646 * For some hardware accelerators, a global context needs to be
2647 * provided by the user. In that case, this holds display-dependent
2648 * data FFmpeg cannot instantiate itself. Please refer to the
2649 * FFmpeg HW accelerator documentation to know how to fill this
2650 * is. e.g. for VA API, this is a struct vaapi_context.
2651 * - encoding: unused
2652 * - decoding: Set by user
2654 void *hwaccel_context;
2657 * Chromaticity coordinates of the source primaries.
2658 * - encoding: Set by user
2659 * - decoding: Set by libavcodec
2661 enum AVColorPrimaries color_primaries;
2664 * Color Transfer Characteristic.
2665 * - encoding: Set by user
2666 * - decoding: Set by libavcodec
2668 enum AVColorTransferCharacteristic color_trc;
2671 * YUV colorspace type.
2672 * - encoding: Set by user
2673 * - decoding: Set by libavcodec
2675 enum AVColorSpace colorspace;
2678 * MPEG vs JPEG YUV range.
2679 * - encoding: Set by user
2680 * - decoding: Set by libavcodec
2682 enum AVColorRange color_range;
2685 * This defines the location of chroma samples.
2686 * - encoding: Set by user
2687 * - decoding: Set by libavcodec
2689 enum AVChromaLocation chroma_sample_location;
2692 * The codec may call this to execute several independent things.
2693 * It will return only after finishing all tasks.
2694 * The user may replace this with some multithreaded implementation,
2695 * the default implementation will execute the parts serially.
2696 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2697 * @param c context passed also to func
2698 * @param count the number of things to execute
2699 * @param arg2 argument passed unchanged to func
2700 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2701 * @param func function that will be called count times, with jobnr from 0 to count-1.
2702 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2703 * two instances of func executing at the same time will have the same threadnr.
2704 * @return always 0 currently, but code should handle a future improvement where when any call to func
2705 * returns < 0 no further calls to func may be done and < 0 is returned.
2706 * - encoding: Set by libavcodec, user can override.
2707 * - decoding: Set by libavcodec, user can override.
2709 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2712 * explicit P-frame weighted prediction analysis method
2714 * 1: fast blind weighting (one reference duplicate with -1 offset)
2715 * 2: smart weighting (full fade detection analysis)
2716 * - encoding: Set by user.
2717 * - decoding: unused
2719 int weighted_p_pred;
2724 * 1: Variance AQ (complexity mask)
2725 * 2: Auto-variance AQ (experimental)
2726 * - encoding: Set by user
2727 * - decoding: unused
2733 * Reduces blocking and blurring in flat and textured areas.
2734 * - encoding: Set by user
2735 * - decoding: unused
2741 * Strength of psychovisual optimization
2742 * - encoding: Set by user
2743 * - decoding: unused
2749 * Strength of psychovisual optimization
2750 * - encoding: Set by user
2751 * - decoding: unused
2757 * Number of frames for frametype and ratecontrol lookahead
2758 * - encoding: Set by user
2759 * - decoding: unused
2764 * Constant rate factor maximum
2765 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2766 * than crf_max, even if doing so would violate VBV restrictions.
2767 * - encoding: Set by user.
2768 * - decoding: unused
2772 int log_level_offset;
2775 * Determines which LPC analysis algorithm to use.
2776 * - encoding: Set by user
2777 * - decoding: unused
2779 enum AVLPCType lpc_type;
2782 * Number of passes to use for Cholesky factorization during LPC analysis
2783 * - encoding: Set by user
2784 * - decoding: unused
2790 * Indicates number of picture subdivisions. Used for parallelized
2792 * - encoding: Set by user
2793 * - decoding: unused
2798 * Header containing style information for text subtitles.
2799 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2800 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2801 * the Format line following. It shouldn't include any Dialogue line.
2802 * - encoding: Set/allocated/freed by user (before avcodec_open())
2803 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2805 uint8_t *subtitle_header;
2806 int subtitle_header_size;
2809 * Current packet as passed into the decoder, to avoid having
2810 * to pass the packet into every function. Currently only valid
2811 * inside lavc and get/release_buffer callbacks.
2812 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2813 * - encoding: unused
2818 * Whether this is a copy of the context which had init() called on it.
2819 * This is used by multithreading - shared tables and picture pointers
2820 * should be freed from the original context only.
2821 * - encoding: Set by libavcodec.
2822 * - decoding: Set by libavcodec.
2827 * Which multithreading methods to use.
2828 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2829 * so clients which cannot provide future frames should not use it.
2831 * - encoding: Set by user, otherwise the default is used.
2832 * - decoding: Set by user, otherwise the default is used.
2835 #define FF_THREAD_FRAME 1 //< Decode more than one frame at once
2836 #define FF_THREAD_SLICE 2 //< Decode more than one part of a single frame at once
2839 * Which multithreading methods are in use by the codec.
2840 * - encoding: Set by libavcodec.
2841 * - decoding: Set by libavcodec.
2843 int active_thread_type;
2846 * Set by the client if its custom get_buffer() callback can be called
2847 * from another thread, which allows faster multithreaded decoding.
2848 * draw_horiz_band() will be called from other threads regardless of this setting.
2849 * Ignored if the default get_buffer() is used.
2850 * - encoding: Set by user.
2851 * - decoding: Set by user.
2853 int thread_safe_callbacks;
2856 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2857 * Used for compliant TS muxing.
2858 * - encoding: Set by libavcodec.
2859 * - decoding: unused.
2864 * Type of service that the audio stream conveys.
2865 * - encoding: Set by user.
2866 * - decoding: Set by libavcodec.
2868 enum AVAudioServiceType audio_service_type;
2871 * Current statistics for PTS correction.
2872 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2873 * - encoding: unused
2875 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2876 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2877 int64_t pts_correction_last_pts; /// PTS of the last frame
2878 int64_t pts_correction_last_dts; /// DTS of the last frame
2885 typedef struct AVProfile {
2887 const char *name; ///< short name for the profile
2893 typedef struct AVCodec {
2895 * Name of the codec implementation.
2896 * The name is globally unique among encoders and among decoders (but an
2897 * encoder and a decoder can share the same name).
2898 * This is the primary way to find a codec from the user perspective.
2901 enum AVMediaType type;
2904 int (*init)(AVCodecContext *);
2905 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2906 int (*close)(AVCodecContext *);
2907 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2909 * Codec capabilities.
2913 struct AVCodec *next;
2916 * Will be called when seeking
2918 void (*flush)(AVCodecContext *);
2919 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2920 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2922 * Descriptive name for the codec, meant to be more human readable than name.
2923 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2925 const char *long_name;
2926 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2927 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2928 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2929 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2930 const AVClass *priv_class; ///< AVClass for the private context
2931 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2934 * @defgroup framethreading Frame-level threading support functions.
2938 * If defined, called on thread contexts when they are created.
2939 * If the codec allocates writable tables in init(), re-allocate them here.
2940 * priv_data will be set to a copy of the original.
2942 int (*init_thread_copy)(AVCodecContext *);
2944 * Copy necessary context variables from a previous thread context to the current one.
2945 * If not defined, the next thread will start automatically; otherwise, the codec
2946 * must call ff_thread_finish_setup().
2948 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2950 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2957 typedef struct AVHWAccel {
2959 * Name of the hardware accelerated codec.
2960 * The name is globally unique among encoders and among decoders (but an
2961 * encoder and a decoder can share the same name).
2966 * Type of codec implemented by the hardware accelerator.
2968 * See AVMEDIA_TYPE_xxx
2970 enum AVMediaType type;
2973 * Codec implemented by the hardware accelerator.
2980 * Supported pixel format.
2982 * Only hardware accelerated formats are supported here.
2984 enum PixelFormat pix_fmt;
2987 * Hardware accelerated codec capabilities.
2988 * see FF_HWACCEL_CODEC_CAP_*
2992 struct AVHWAccel *next;
2995 * Called at the beginning of each frame or field picture.
2997 * Meaningful frame information (codec specific) is guaranteed to
2998 * be parsed at this point. This function is mandatory.
3000 * Note that buf can be NULL along with buf_size set to 0.
3001 * Otherwise, this means the whole frame is available at this point.
3003 * @param avctx the codec context
3004 * @param buf the frame data buffer base
3005 * @param buf_size the size of the frame in bytes
3006 * @return zero if successful, a negative value otherwise
3008 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3011 * Callback for each slice.
3013 * Meaningful slice information (codec specific) is guaranteed to
3014 * be parsed at this point. This function is mandatory.
3016 * @param avctx the codec context
3017 * @param buf the slice data buffer base
3018 * @param buf_size the size of the slice in bytes
3019 * @return zero if successful, a negative value otherwise
3021 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3024 * Called at the end of each frame or field picture.
3026 * The whole picture is parsed at this point and can now be sent
3027 * to the hardware accelerator. This function is mandatory.
3029 * @param avctx the codec context
3030 * @return zero if successful, a negative value otherwise
3032 int (*end_frame)(AVCodecContext *avctx);
3035 * Size of HW accelerator private data.
3037 * Private data is allocated with av_mallocz() before
3038 * AVCodecContext.get_buffer() and deallocated after
3039 * AVCodecContext.release_buffer().
3045 * four components are given, that's all.
3046 * the last component is alpha
3048 typedef struct AVPicture {
3050 int linesize[4]; ///< number of bytes per line
3053 #if FF_API_PALETTE_CONTROL
3056 * This structure defines a method for communicating palette changes
3057 * between and demuxer and a decoder.
3059 * @deprecated Use AVPacket to send palette changes instead.
3060 * This is totally broken.
3062 #define AVPALETTE_SIZE 1024
3063 #define AVPALETTE_COUNT 256
3064 typedef struct AVPaletteControl {
3066 /* Demuxer sets this to 1 to indicate the palette has changed;
3067 * decoder resets to 0. */
3068 int palette_changed;
3070 /* 4-byte ARGB palette entries, stored in native byte order; note that
3071 * the individual palette components should be on a 8-bit scale; if
3072 * the palette data comes from an IBM VGA native format, the component
3073 * data is probably 6 bits in size and needs to be scaled. */
3074 unsigned int palette[AVPALETTE_COUNT];
3076 } AVPaletteControl attribute_deprecated;
3079 enum AVSubtitleType {
3082 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3085 * Plain text, the text field must be set by the decoder and is
3086 * authoritative. ass and pict fields may contain approximations.
3091 * Formatted text, the ass field must be set by the decoder and is
3092 * authoritative. pict and text fields may contain approximations.
3097 typedef struct AVSubtitleRect {
3098 int x; ///< top left corner of pict, undefined when pict is not set
3099 int y; ///< top left corner of pict, undefined when pict is not set
3100 int w; ///< width of pict, undefined when pict is not set
3101 int h; ///< height of pict, undefined when pict is not set
3102 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3105 * data+linesize for the bitmap of this subtitle.
3106 * can be set for text/ass as well once they where rendered
3109 enum AVSubtitleType type;
3111 char *text; ///< 0 terminated plain UTF-8 text
3114 * 0 terminated ASS/SSA compatible event line.
3115 * The pressentation of this is unaffected by the other values in this
3121 typedef struct AVSubtitle {
3122 uint16_t format; /* 0 = graphics */
3123 uint32_t start_display_time; /* relative to packet pts, in ms */
3124 uint32_t end_display_time; /* relative to packet pts, in ms */
3126 AVSubtitleRect **rects;
3127 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3130 /* packet functions */
3133 * @deprecated use NULL instead
3135 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3138 * Default packet destructor.
3140 void av_destruct_packet(AVPacket *pkt);
3143 * Initialize optional fields of a packet with default values.
3147 void av_init_packet(AVPacket *pkt);
3150 * Allocate the payload of a packet and initialize its fields with
3154 * @param size wanted payload size
3155 * @return 0 if OK, AVERROR_xxx otherwise
3157 int av_new_packet(AVPacket *pkt, int size);
3160 * Reduce packet size, correctly zeroing padding
3163 * @param size new size
3165 void av_shrink_packet(AVPacket *pkt, int size);
3168 * Increase packet size, correctly zeroing padding
3171 * @param grow_by number of bytes by which to increase the size of the packet
3173 int av_grow_packet(AVPacket *pkt, int grow_by);
3176 * @warning This is a hack - the packet memory allocation stuff is broken. The
3177 * packet is allocated if it was not really allocated.
3179 int av_dup_packet(AVPacket *pkt);
3184 * @param pkt packet to free
3186 void av_free_packet(AVPacket *pkt);
3189 * Allocate new information of a packet.
3192 * @param type side information type
3193 * @param size side information size
3194 * @return pointer to fresh allocated data or NULL otherwise
3196 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3200 * Get side information from packet.
3203 * @param type desired side information type
3204 * @param size pointer for side information size to store (optional)
3205 * @return pointer to data if present or NULL otherwise
3207 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3212 struct ReSampleContext;
3213 struct AVResampleContext;
3215 typedef struct ReSampleContext ReSampleContext;
3218 * Initialize audio resampling context.
3220 * @param output_channels number of output channels
3221 * @param input_channels number of input channels
3222 * @param output_rate output sample rate
3223 * @param input_rate input sample rate
3224 * @param sample_fmt_out requested output sample format
3225 * @param sample_fmt_in input sample format
3226 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3227 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3228 * @param linear if 1 then the used FIR filter will be linearly interpolated
3229 between the 2 closest, if 0 the closest will be used
3230 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3231 * @return allocated ReSampleContext, NULL if error occured
3233 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3234 int output_rate, int input_rate,
3235 enum AVSampleFormat sample_fmt_out,
3236 enum AVSampleFormat sample_fmt_in,
3237 int filter_length, int log2_phase_count,
3238 int linear, double cutoff);
3240 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3243 * Free resample context.
3245 * @param s a non-NULL pointer to a resample context previously
3246 * created with av_audio_resample_init()
3248 void audio_resample_close(ReSampleContext *s);
3252 * Initialize an audio resampler.
3253 * Note, if either rate is not an integer then simply scale both rates up so they are.
3254 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3255 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3256 * @param linear If 1 then the used FIR filter will be linearly interpolated
3257 between the 2 closest, if 0 the closest will be used
3258 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3260 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3263 * Resample an array of samples using a previously configured context.
3264 * @param src an array of unconsumed samples
3265 * @param consumed the number of samples of src which have been consumed are returned here
3266 * @param src_size the number of unconsumed samples available
3267 * @param dst_size the amount of space in samples available in dst
3268 * @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.
3269 * @return the number of samples written in dst or -1 if an error occurred
3271 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3275 * Compensate samplerate/timestamp drift. The compensation is done by changing
3276 * the resampler parameters, so no audible clicks or similar distortions occur
3277 * @param compensation_distance distance in output samples over which the compensation should be performed
3278 * @param sample_delta number of output samples which should be output less
3280 * example: av_resample_compensate(c, 10, 500)
3281 * here instead of 510 samples only 500 samples would be output
3283 * note, due to rounding the actual compensation might be slightly different,
3284 * especially if the compensation_distance is large and the in_rate used during init is small
3286 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3287 void av_resample_close(struct AVResampleContext *c);
3290 * Allocate memory for a picture. Call avpicture_free() to free it.
3292 * \see avpicture_fill()
3294 * @param picture the picture to be filled in
3295 * @param pix_fmt the format of the picture
3296 * @param width the width of the picture
3297 * @param height the height of the picture
3298 * @return zero if successful, a negative value if not
3300 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3303 * Free a picture previously allocated by avpicture_alloc().
3304 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3307 * @param picture the AVPicture to be freed
3309 void avpicture_free(AVPicture *picture);
3312 * Fill in the AVPicture fields.
3313 * The fields of the given AVPicture are filled in by using the 'ptr' address
3314 * which points to the image data buffer. Depending on the specified picture
3315 * format, one or multiple image data pointers and line sizes will be set.
3316 * If a planar format is specified, several pointers will be set pointing to
3317 * the different picture planes and the line sizes of the different planes
3318 * will be stored in the lines_sizes array.
3319 * Call with ptr == NULL to get the required size for the ptr buffer.
3321 * To allocate the buffer and fill in the AVPicture fields in one call,
3322 * use avpicture_alloc().
3324 * @param picture AVPicture whose fields are to be filled in
3325 * @param ptr Buffer which will contain or contains the actual image data
3326 * @param pix_fmt The format in which the picture data is stored.
3327 * @param width the width of the image in pixels
3328 * @param height the height of the image in pixels
3329 * @return size of the image data in bytes
3331 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3332 enum PixelFormat pix_fmt, int width, int height);
3335 * Copy pixel data from an AVPicture into a buffer.
3336 * The data is stored compactly, without any gaps for alignment or padding
3337 * which may be applied by avpicture_fill().
3339 * \see avpicture_get_size()
3341 * @param[in] src AVPicture containing image data
3342 * @param[in] pix_fmt The format in which the picture data is stored.
3343 * @param[in] width the width of the image in pixels.
3344 * @param[in] height the height of the image in pixels.
3345 * @param[out] dest A buffer into which picture data will be copied.
3346 * @param[in] dest_size The size of 'dest'.
3347 * @return The number of bytes written to dest, or a negative value (error code) on error.
3349 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3350 unsigned char *dest, int dest_size);
3353 * Calculate the size in bytes that a picture of the given width and height
3354 * would occupy if stored in the given picture format.
3355 * Note that this returns the size of a compact representation as generated
3356 * by avpicture_layout(), which can be smaller than the size required for e.g.
3359 * @param pix_fmt the given picture format
3360 * @param width the width of the image
3361 * @param height the height of the image
3362 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3364 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3365 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3368 * Return the short name for a pixel format.
3370 * \see av_get_pix_fmt(), av_get_pix_fmt_string().
3372 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3374 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3377 * Return a value representing the fourCC code associated to the
3378 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3381 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3384 * Put a string representing the codec tag codec_tag in buf.
3386 * @param buf_size size in bytes of buf
3387 * @return the length of the string that would have been generated if
3388 * enough space had been available, excluding the trailing null
3390 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3392 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3393 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3394 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3395 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3396 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3397 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3400 * Compute what kind of losses will occur when converting from one specific
3401 * pixel format to another.
3402 * When converting from one pixel format to another, information loss may occur.
3403 * For example, when converting from RGB24 to GRAY, the color information will
3404 * be lost. Similarly, other losses occur when converting from some formats to
3405 * other formats. These losses can involve loss of chroma, but also loss of
3406 * resolution, loss of color depth, loss due to the color space conversion, loss
3407 * of the alpha bits or loss due to color quantization.
3408 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3409 * which will occur when converting from one pixel format to another.
3411 * @param[in] dst_pix_fmt destination pixel format
3412 * @param[in] src_pix_fmt source pixel format
3413 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3414 * @return Combination of flags informing you what kind of losses will occur.
3416 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3420 * Find the best pixel format to convert to given a certain source pixel
3421 * format. When converting from one pixel format to another, information loss
3422 * may occur. For example, when converting from RGB24 to GRAY, the color
3423 * information will be lost. Similarly, other losses occur when converting from
3424 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3425 * the given pixel formats should be used to suffer the least amount of loss.
3426 * The pixel formats from which it chooses one, are determined by the
3427 * pix_fmt_mask parameter.
3430 * src_pix_fmt = PIX_FMT_YUV420P;
3431 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3432 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3435 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3436 * @param[in] src_pix_fmt source pixel format
3437 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3438 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3439 * @return The best pixel format to convert to or -1 if none was found.
3441 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3442 int has_alpha, int *loss_ptr);
3444 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3445 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3448 * Tell if an image really has transparent alpha values.
3449 * @return ored mask of FF_ALPHA_xxx constants
3451 int img_get_alpha_info(const AVPicture *src,
3452 enum PixelFormat pix_fmt, int width, int height);
3454 /* deinterlace a picture */
3455 /* deinterlace - if not supported return -1 */
3456 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3457 enum PixelFormat pix_fmt, int width, int height);
3459 /* external high level API */
3462 * If c is NULL, returns the first registered codec,
3463 * if c is non-NULL, returns the next registered codec after c,
3464 * or NULL if c is the last one.
3466 AVCodec *av_codec_next(AVCodec *c);
3469 * Return the LIBAVCODEC_VERSION_INT constant.
3471 unsigned avcodec_version(void);
3474 * Return the libavcodec build-time configuration.
3476 const char *avcodec_configuration(void);
3479 * Return the libavcodec license.
3481 const char *avcodec_license(void);
3484 * Initialize libavcodec.
3485 * If called more than once, does nothing.
3487 * @warning This function must be called before any other libavcodec
3490 * @warning This function is not thread-safe.
3492 void avcodec_init(void);
3495 * Register the codec codec and initialize libavcodec.
3497 * @see avcodec_init(), avcodec_register_all()
3499 void avcodec_register(AVCodec *codec);
3502 * Find a registered encoder with a matching codec ID.
3504 * @param id CodecID of the requested encoder
3505 * @return An encoder if one was found, NULL otherwise.
3507 AVCodec *avcodec_find_encoder(enum CodecID id);
3510 * Find a registered encoder with the specified name.
3512 * @param name name of the requested encoder
3513 * @return An encoder if one was found, NULL otherwise.
3515 AVCodec *avcodec_find_encoder_by_name(const char *name);
3518 * Find a registered decoder with a matching codec ID.
3520 * @param id CodecID of the requested decoder
3521 * @return A decoder if one was found, NULL otherwise.
3523 AVCodec *avcodec_find_decoder(enum CodecID id);
3526 * Find a registered decoder with the specified name.
3528 * @param name name of the requested decoder
3529 * @return A decoder if one was found, NULL otherwise.
3531 AVCodec *avcodec_find_decoder_by_name(const char *name);
3532 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3535 * Return a name for the specified profile, if available.
3537 * @param codec the codec that is searched for the given profile
3538 * @param profile the profile value for which a name is requested
3539 * @return A name for the profile if found, NULL otherwise.
3541 const char *av_get_profile_name(const AVCodec *codec, int profile);
3544 * Set the fields of the given AVCodecContext to default values.
3546 * @param s The AVCodecContext of which the fields should be set to default values.
3548 void avcodec_get_context_defaults(AVCodecContext *s);
3550 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3551 * we WILL change its arguments and name a few times! */
3552 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3554 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3555 * we WILL change its arguments and name a few times! */
3556 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3559 * Allocate an AVCodecContext and set its fields to default values. The
3560 * resulting struct can be deallocated by simply calling av_free().
3562 * @return An AVCodecContext filled with default values or NULL on failure.
3563 * @see avcodec_get_context_defaults
3565 AVCodecContext *avcodec_alloc_context(void);
3567 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3568 * we WILL change its arguments and name a few times! */
3569 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3571 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3572 * we WILL change its arguments and name a few times! */
3573 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3576 * Copy the settings of the source AVCodecContext into the destination
3577 * AVCodecContext. The resulting destination codec context will be
3578 * unopened, i.e. you are required to call avcodec_open() before you
3579 * can use this AVCodecContext to decode/encode video/audio data.
3581 * @param dest target codec context, should be initialized with
3582 * avcodec_alloc_context(), but otherwise uninitialized
3583 * @param src source codec context
3584 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3586 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3589 * Set the fields of the given AVFrame to default values.
3591 * @param pic The AVFrame of which the fields should be set to default values.
3593 void avcodec_get_frame_defaults(AVFrame *pic);
3596 * Allocate an AVFrame and set its fields to default values. The resulting
3597 * struct can be deallocated by simply calling av_free().
3599 * @return An AVFrame filled with default values or NULL on failure.
3600 * @see avcodec_get_frame_defaults
3602 AVFrame *avcodec_alloc_frame(void);
3604 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3605 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3606 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3609 * Return the amount of padding in pixels which the get_buffer callback must
3610 * provide around the edge of the image for codecs which do not have the
3611 * CODEC_FLAG_EMU_EDGE flag.
3613 * @return Required padding in pixels.
3615 unsigned avcodec_get_edge_width(void);
3617 * Modify width and height values so that they will result in a memory
3618 * buffer that is acceptable for the codec if you do not use any horizontal
3621 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3622 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3623 * according to avcodec_get_edge_width() before.
3625 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3627 * Modify width and height values so that they will result in a memory
3628 * buffer that is acceptable for the codec if you also ensure that all
3629 * line sizes are a multiple of the respective linesize_align[i].
3631 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3632 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3633 * according to avcodec_get_edge_width() before.
3635 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3636 int linesize_align[4]);
3638 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3640 #if FF_API_THREAD_INIT
3642 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3644 attribute_deprecated
3645 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3648 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3649 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3650 //FIXME func typedef
3653 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3654 * function the context has to be allocated.
3656 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3657 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3658 * retrieving a codec.
3660 * @warning This function is not thread safe!
3663 * avcodec_register_all();
3664 * codec = avcodec_find_decoder(CODEC_ID_H264);
3668 * context = avcodec_alloc_context();
3670 * if (avcodec_open(context, codec) < 0)
3674 * @param avctx The context which will be set up to use the given codec.
3675 * @param codec The codec to use within the context.
3676 * @return zero on success, a negative value on error
3677 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3679 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3682 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3683 * Some decoders may support multiple frames in a single AVPacket, such
3684 * decoders would then just decode the first frame. In this case,
3685 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3686 * the remaining data in order to decode the second frame etc.
3688 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3689 * decompressed frame size in bytes.
3691 * @warning You must set frame_size_ptr to the allocated size of the
3692 * output buffer before calling avcodec_decode_audio3().
3694 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3695 * the actual read bytes because some optimized bitstream readers read 32 or 64
3696 * bits at once and could read over the end.
3698 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3699 * no overreading happens for damaged MPEG streams.
3701 * @note You might have to align the input buffer avpkt->data and output buffer
3702 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3703 * necessary at all, on others it won't work at all if not aligned and on others
3704 * it will work but it will have an impact on performance.
3706 * In practice, avpkt->data should have 4 byte alignment at minimum and
3707 * samples should be 16 byte aligned unless the CPU doesn't need it
3708 * (AltiVec and SSE do).
3710 * @param avctx the codec context
3711 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3712 * @param[in,out] frame_size_ptr the output buffer size in bytes
3713 * @param[in] avpkt The input AVPacket containing the input buffer.
3714 * You can create such packet with av_init_packet() and by then setting
3715 * data and size, some decoders might in addition need other fields.
3716 * All decoders are designed to use the least fields possible though.
3717 * @return On error a negative value is returned, otherwise the number of bytes
3718 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3720 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3721 int *frame_size_ptr,
3725 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3726 * Some decoders may support multiple frames in a single AVPacket, such
3727 * decoders would then just decode the first frame.
3729 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3730 * the actual read bytes because some optimized bitstream readers read 32 or 64
3731 * bits at once and could read over the end.
3733 * @warning The end of the input buffer buf should be set to 0 to ensure that
3734 * no overreading happens for damaged MPEG streams.
3736 * @note You might have to align the input buffer avpkt->data.
3737 * The alignment requirements depend on the CPU: on some CPUs it isn't
3738 * necessary at all, on others it won't work at all if not aligned and on others
3739 * it will work but it will have an impact on performance.
3741 * In practice, avpkt->data should have 4 byte alignment at minimum.
3743 * @note Some codecs have a delay between input and output, these need to be
3744 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3746 * @param avctx the codec context
3747 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3748 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3749 * allocate memory for the actual bitmap.
3750 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3751 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3752 * decodes and the decoder tells the user once it does not need the data anymore,
3753 * the user app can at this point free/reuse/keep the memory as it sees fit.
3755 * @param[in] avpkt The input AVpacket containing the input buffer.
3756 * You can create such packet with av_init_packet() and by then setting
3757 * data and size, some decoders might in addition need other fields like
3758 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3760 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3761 * @return On error a negative value is returned, otherwise the number of bytes
3762 * used or zero if no frame could be decompressed.
3764 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3765 int *got_picture_ptr,
3769 * Decode a subtitle message.
3770 * Return a negative value on error, otherwise return the number of bytes used.
3771 * If no subtitle could be decompressed, got_sub_ptr is zero.
3772 * Otherwise, the subtitle is stored in *sub.
3773 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3774 * simplicity, because the performance difference is expect to be negligible
3775 * and reusing a get_buffer written for video codecs would probably perform badly
3776 * due to a potentially very different allocation pattern.
3778 * @param avctx the codec context
3779 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3780 freed with avsubtitle_free if *got_sub_ptr is set.
3781 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3782 * @param[in] avpkt The input AVPacket containing the input buffer.
3784 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3789 * Frees all allocated data in the given subtitle struct.
3791 * @param sub AVSubtitle to free.
3793 void avsubtitle_free(AVSubtitle *sub);
3795 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3797 uint8_t *buf, int buf_size);
3800 * Encode an audio frame from samples into buf.
3802 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3803 * However, for PCM audio the user will know how much space is needed
3804 * because it depends on the value passed in buf_size as described
3805 * below. In that case a lower value can be used.
3807 * @param avctx the codec context
3808 * @param[out] buf the output buffer
3809 * @param[in] buf_size the output buffer size
3810 * @param[in] samples the input buffer containing the samples
3811 * The number of samples read from this buffer is frame_size*channels,
3812 * both of which are defined in avctx.
3813 * For PCM audio the number of samples read from samples is equal to
3814 * buf_size * input_sample_size / output_sample_size.
3815 * @return On error a negative value is returned, on success zero or the number
3816 * of bytes used to encode the data read from the input buffer.
3818 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3819 const short *samples);
3822 * Encode a video frame from pict into buf.
3823 * The input picture should be
3824 * stored using a specific format, namely avctx.pix_fmt.
3826 * @param avctx the codec context
3827 * @param[out] buf the output buffer for the bitstream of encoded frame
3828 * @param[in] buf_size the size of the output buffer in bytes
3829 * @param[in] pict the input picture to encode
3830 * @return On error a negative value is returned, on success zero or the number
3831 * of bytes used from the output buffer.
3833 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3834 const AVFrame *pict);
3835 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3836 const AVSubtitle *sub);
3838 int avcodec_close(AVCodecContext *avctx);
3841 * Register all the codecs, parsers and bitstream filters which were enabled at
3842 * configuration time. If you do not call this function you can select exactly
3843 * which formats you want to support, by using the individual registration
3846 * @see avcodec_register
3847 * @see av_register_codec_parser
3848 * @see av_register_bitstream_filter
3850 void avcodec_register_all(void);
3853 * Flush buffers, should be called when seeking or when switching to a different stream.
3855 void avcodec_flush_buffers(AVCodecContext *avctx);
3857 void avcodec_default_free_buffers(AVCodecContext *s);
3859 /* misc useful functions */
3862 * Return a single letter to describe the given picture type pict_type.
3864 * @param[in] pict_type the picture type
3865 * @return A single character representing the picture type.
3867 char av_get_pict_type_char(int pict_type);
3870 * Return codec bits per sample.
3872 * @param[in] codec_id the codec
3873 * @return Number of bits per sample or zero if unknown for the given codec.
3875 int av_get_bits_per_sample(enum CodecID codec_id);
3877 #if FF_API_OLD_SAMPLE_FMT
3879 * @deprecated Use av_get_bits_per_sample_fmt() instead.
3881 attribute_deprecated
3882 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
3886 typedef struct AVCodecParserContext {
3888 struct AVCodecParser *parser;
3889 int64_t frame_offset; /* offset of the current frame */
3890 int64_t cur_offset; /* current offset
3891 (incremented by each av_parser_parse()) */
3892 int64_t next_frame_offset; /* offset of the next frame */
3894 int pict_type; /* XXX: Put it back in AVCodecContext. */
3896 * This field is used for proper frame duration computation in lavf.
3897 * It signals, how much longer the frame duration of the current frame
3898 * is compared to normal frame duration.
3900 * frame_duration = (1 + repeat_pict) * time_base
3902 * It is used by codecs like H.264 to display telecined material.
3904 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3905 int64_t pts; /* pts of the current frame */
3906 int64_t dts; /* dts of the current frame */
3911 int fetch_timestamp;
3913 #define AV_PARSER_PTS_NB 4
3914 int cur_frame_start_index;
3915 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3916 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3917 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3920 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3921 #define PARSER_FLAG_ONCE 0x0002
3922 /// Set if the parser has a valid file offset
3923 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3925 int64_t offset; ///< byte offset from starting packet start
3926 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3929 * Set by parser to 1 for key frames and 0 for non-key frames.
3930 * It is initialized to -1, so if the parser doesn't set this flag,
3931 * old-style fallback using FF_I_TYPE picture type as key frames
3937 * Time difference in stream time base units from the pts of this
3938 * packet to the point at which the output from the decoder has converged
3939 * independent from the availability of previous frames. That is, the
3940 * frames are virtually identical no matter if decoding started from
3941 * the very first frame or from this keyframe.
3942 * Is AV_NOPTS_VALUE if unknown.
3943 * This field is not the display duration of the current frame.
3944 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3947 * The purpose of this field is to allow seeking in streams that have no
3948 * keyframes in the conventional sense. It corresponds to the
3949 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3950 * essential for some types of subtitle streams to ensure that all
3951 * subtitles are correctly displayed after seeking.
3953 int64_t convergence_duration;
3955 // Timestamp generation support:
3957 * Synchronization point for start of timestamp generation.
3959 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3962 * For example, this corresponds to presence of H.264 buffering period
3968 * Offset of the current timestamp against last timestamp sync point in
3969 * units of AVCodecContext.time_base.
3971 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3972 * contain a valid timestamp offset.
3974 * Note that the timestamp of sync point has usually a nonzero
3975 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3976 * the next frame after timestamp sync point will be usually 1.
3978 * For example, this corresponds to H.264 cpb_removal_delay.
3980 int dts_ref_dts_delta;
3983 * Presentation delay of current frame in units of AVCodecContext.time_base.
3985 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3986 * contain valid non-negative timestamp delta (presentation time of a frame
3987 * must not lie in the past).
3989 * This delay represents the difference between decoding and presentation
3990 * time of the frame.
3992 * For example, this corresponds to H.264 dpb_output_delay.
3997 * Position of the packet in file.
3999 * Analogous to cur_frame_pts/dts
4001 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4004 * Byte position of currently parsed frame in stream.
4009 * Previous frame byte position.
4012 } AVCodecParserContext;
4014 typedef struct AVCodecParser {
4015 int codec_ids[5]; /* several codec IDs are permitted */
4017 int (*parser_init)(AVCodecParserContext *s);
4018 int (*parser_parse)(AVCodecParserContext *s,
4019 AVCodecContext *avctx,
4020 const uint8_t **poutbuf, int *poutbuf_size,
4021 const uint8_t *buf, int buf_size);
4022 void (*parser_close)(AVCodecParserContext *s);
4023 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4024 struct AVCodecParser *next;
4027 AVCodecParser *av_parser_next(AVCodecParser *c);
4029 void av_register_codec_parser(AVCodecParser *parser);
4030 AVCodecParserContext *av_parser_init(int codec_id);
4035 * @param s parser context.
4036 * @param avctx codec context.
4037 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4038 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4039 * @param buf input buffer.
4040 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4041 * @param pts input presentation timestamp.
4042 * @param dts input decoding timestamp.
4043 * @param pos input byte position in stream.
4044 * @return the number of bytes of the input bitstream used.
4049 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4056 * decode_frame(data, size);
4060 int av_parser_parse2(AVCodecParserContext *s,
4061 AVCodecContext *avctx,
4062 uint8_t **poutbuf, int *poutbuf_size,
4063 const uint8_t *buf, int buf_size,
4064 int64_t pts, int64_t dts,
4067 int av_parser_change(AVCodecParserContext *s,
4068 AVCodecContext *avctx,
4069 uint8_t **poutbuf, int *poutbuf_size,
4070 const uint8_t *buf, int buf_size, int keyframe);
4071 void av_parser_close(AVCodecParserContext *s);
4074 typedef struct AVBitStreamFilterContext {
4076 struct AVBitStreamFilter *filter;
4077 AVCodecParserContext *parser;
4078 struct AVBitStreamFilterContext *next;
4079 } AVBitStreamFilterContext;
4082 typedef struct AVBitStreamFilter {
4085 int (*filter)(AVBitStreamFilterContext *bsfc,
4086 AVCodecContext *avctx, const char *args,
4087 uint8_t **poutbuf, int *poutbuf_size,
4088 const uint8_t *buf, int buf_size, int keyframe);
4089 void (*close)(AVBitStreamFilterContext *bsfc);
4090 struct AVBitStreamFilter *next;
4091 } AVBitStreamFilter;
4093 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4094 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4095 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4096 AVCodecContext *avctx, const char *args,
4097 uint8_t **poutbuf, int *poutbuf_size,
4098 const uint8_t *buf, int buf_size, int keyframe);
4099 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4101 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4106 * Reallocate the given block if it is not large enough, otherwise do nothing.
4110 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4113 * Allocate a buffer, reusing the given one if large enough.
4115 * Contrary to av_fast_realloc the current buffer contents might not be
4116 * preserved and on error the old buffer is freed, thus no special
4117 * handling to avoid memleaks is necessary.
4119 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4120 * @param size size of the buffer *ptr points to
4121 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4122 * *size 0 if an error occurred.
4124 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4127 * Copy image src to dst. Wraps av_picture_data_copy() above.
4129 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4130 enum PixelFormat pix_fmt, int width, int height);
4133 * Crop image top and left side.
4135 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4136 enum PixelFormat pix_fmt, int top_band, int left_band);
4141 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4142 int padtop, int padbottom, int padleft, int padright, int *color);
4145 * Encode extradata length to a buffer. Used by xiph codecs.
4147 * @param s buffer to write to; must be at least (v/255+1) bytes long
4148 * @param v size of extradata in bytes
4149 * @return number of bytes written to the buffer.
4151 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4154 * Logs a generic warning message about a missing feature. This function is
4155 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4156 * only, and would normally not be used by applications.
4157 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4158 * a pointer to an AVClass struct
4159 * @param[in] feature string containing the name of the missing feature
4160 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4161 * If want_sample is non-zero, additional verbage will be added to the log
4162 * message which tells the user how to report samples to the development
4165 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4168 * Log a generic warning message asking for a sample. This function is
4169 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4170 * only, and would normally not be used by applications.
4171 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4172 * a pointer to an AVClass struct
4173 * @param[in] msg string containing an optional message, or NULL if no message
4175 void av_log_ask_for_sample(void *avc, const char *msg, ...);
4178 * Register the hardware accelerator hwaccel.
4180 void av_register_hwaccel(AVHWAccel *hwaccel);
4183 * If hwaccel is NULL, returns the first registered hardware accelerator,
4184 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4185 * after hwaccel, or NULL if hwaccel is the last one.
4187 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4191 * Lock operation used by lockmgr
4194 AV_LOCK_CREATE, ///< Create a mutex
4195 AV_LOCK_OBTAIN, ///< Lock the mutex
4196 AV_LOCK_RELEASE, ///< Unlock the mutex
4197 AV_LOCK_DESTROY, ///< Free mutex resources
4201 * Register a user provided lock manager supporting the operations
4202 * specified by AVLockOp. mutex points to a (void *) where the
4203 * lockmgr should store/get a pointer to a user allocated mutex. It's
4204 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4206 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4207 * callback during the call to av_lockmgr_register().
4208 * Thus, the application must be prepared to handle that.
4209 * If cb is set to NULL the lockmgr will be unregistered.
4210 * Also note that during unregistration the previously registered
4211 * lockmgr callback may also be invoked.
4213 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4215 #endif /* AVCODEC_AVCODEC_H */