2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
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,
337 /* subtitle codecs */
338 CODEC_ID_DVD_SUBTITLE= 0x17000,
339 CODEC_ID_DVB_SUBTITLE,
340 CODEC_ID_TEXT, ///< raw UTF-8 text
344 CODEC_ID_HDMV_PGS_SUBTITLE,
345 CODEC_ID_DVB_TELETEXT,
348 /* other specific kind of codecs (generally used for attachments) */
349 CODEC_ID_TTF= 0x18000,
351 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
353 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
354 * stream (only used by libavformat) */
355 CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
358 #if FF_API_OLD_SAMPLE_FMT
359 #define SampleFormat AVSampleFormat
361 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
362 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
363 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
364 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
365 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
366 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
367 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
370 #if FF_API_OLD_AUDIOCONVERT
371 #include "libavutil/audioconvert.h"
373 /* Audio channel masks */
374 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
375 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
376 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
377 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
378 #define CH_BACK_LEFT AV_CH_BACK_LEFT
379 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
380 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
381 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
382 #define CH_BACK_CENTER AV_CH_BACK_CENTER
383 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
384 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
385 #define CH_TOP_CENTER AV_CH_TOP_CENTER
386 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
387 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
388 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
389 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
390 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
391 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
392 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
393 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
395 /** Channel mask value used for AVCodecContext.request_channel_layout
396 to indicate that the user requests the channel order of the decoder output
397 to be the native codec channel order. */
398 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
400 /* Audio channel convenience macros */
401 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
402 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
403 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
404 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
405 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
406 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
407 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
408 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
409 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
410 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
411 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
412 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
413 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
414 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
415 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
419 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
422 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
423 * This is mainly needed because some optimized bitstream readers read
424 * 32 or 64 bit at once and could read over the end.<br>
425 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
426 * MPEG bitstreams could cause overread and segfault.
428 #define FF_INPUT_BUFFER_PADDING_SIZE 8
431 * minimum encoding buffer size
432 * Used to avoid some checks during header writing.
434 #define FF_MIN_BUFFER_SIZE 16384
438 * motion estimation type.
441 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
445 ME_EPZS, ///< enhanced predictive zonal search
446 ME_X1, ///< reserved for experiments
447 ME_HEX, ///< hexagon based search
448 ME_UMH, ///< uneven multi-hexagon search
449 ME_ITER, ///< iterative search
450 ME_TESA, ///< transformed exhaustive search algorithm
454 /* We leave some space between them for extensions (drop some
455 * keyframes for intra-only or drop just some bidir frames). */
456 AVDISCARD_NONE =-16, ///< discard nothing
457 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
458 AVDISCARD_NONREF = 8, ///< discard all non reference
459 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
460 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
461 AVDISCARD_ALL = 48, ///< discard all
464 enum AVColorPrimaries{
465 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
466 AVCOL_PRI_UNSPECIFIED=2,
468 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
469 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
470 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
472 AVCOL_PRI_NB , ///< Not part of ABI
475 enum AVColorTransferCharacteristic{
476 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
477 AVCOL_TRC_UNSPECIFIED=2,
478 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
479 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
480 AVCOL_TRC_NB , ///< Not part of ABI
485 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
486 AVCOL_SPC_UNSPECIFIED=2,
488 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
489 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
490 AVCOL_SPC_SMPTE240M =7,
491 AVCOL_SPC_NB , ///< Not part of ABI
495 AVCOL_RANGE_UNSPECIFIED=0,
496 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
497 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
498 AVCOL_RANGE_NB , ///< Not part of ABI
502 * X X 3 4 X X are luma samples,
503 * 1 2 1-6 are possible chroma positions
504 * X X 5 6 X 0 is undefined/unknown position
506 enum AVChromaLocation{
507 AVCHROMA_LOC_UNSPECIFIED=0,
508 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
509 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
510 AVCHROMA_LOC_TOPLEFT =3, ///< DV
512 AVCHROMA_LOC_BOTTOMLEFT =5,
513 AVCHROMA_LOC_BOTTOM =6,
514 AVCHROMA_LOC_NB , ///< Not part of ABI
521 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
522 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
523 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
524 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
525 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
526 AV_LPC_TYPE_NB , ///< Not part of ABI
529 enum AVAudioServiceType {
530 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
531 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
532 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
533 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
534 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
535 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
536 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
537 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
538 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
539 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
542 typedef struct RcOverride{
545 int qscale; // If this is 0 then quality_factor will be used instead.
546 float quality_factor;
549 #define FF_MAX_B_FRAMES 16
552 These flags can be passed in AVCodecContext.flags before initialization.
553 Note: Not everything is supported yet.
556 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
557 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
558 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
559 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
560 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
561 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
563 * The parent program guarantees that the input for B-frames containing
564 * streams is not written to for at least s->max_b_frames+1 frames, if
565 * this is not set the input will be copied.
567 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
568 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
569 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
570 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
571 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
572 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
573 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
574 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
575 location instead of only at frame boundaries. */
576 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
577 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
578 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
579 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
580 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
581 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
582 /* Fx : Flag for h263+ extra options */
583 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
584 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
585 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
586 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
587 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
588 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
589 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
590 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
591 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
592 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
593 #define CODEC_FLAG_CLOSED_GOP 0x80000000
594 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
595 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
596 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
597 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
598 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
599 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
600 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
601 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
602 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
603 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
604 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
605 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
606 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
607 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
608 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
609 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
610 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
611 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
612 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
613 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
614 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
615 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
617 /* Unsupported options :
618 * Syntax Arithmetic coding (SAC)
619 * Reference Picture Selection
620 * Independent Segment Decoding */
622 /* codec capabilities */
624 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
626 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
627 * If not set, it might not use get_buffer() at all or use operations that
628 * assume the buffer was allocated by avcodec_default_get_buffer.
630 #define CODEC_CAP_DR1 0x0002
631 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
632 #define CODEC_CAP_PARSE_ONLY 0x0004
633 #define CODEC_CAP_TRUNCATED 0x0008
634 /* Codec can export data for HW decoding (XvMC). */
635 #define CODEC_CAP_HWACCEL 0x0010
637 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
638 * If this is not set, the codec is guaranteed to never be fed with NULL data.
640 #define CODEC_CAP_DELAY 0x0020
642 * Codec can be fed a final frame with a smaller size.
643 * This can be used to prevent truncation of the last audio samples.
645 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
647 * Codec can export data for HW decoding (VDPAU).
649 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
651 * Codec can output multiple frames per AVPacket
652 * Normally demuxers return one frame at a time, demuxers which do not do
653 * are connected to a parser to split what they return into proper frames.
654 * This flag is reserved to the very rare category of codecs which have a
655 * bitstream that cannot be split into frames without timeconsuming
656 * operations like full decoding. Demuxers carring such bitstreams thus
657 * may return multiple frames in a packet. This has many disadvantages like
658 * prohibiting stream copy in many cases thus it should only be considered
661 #define CODEC_CAP_SUBFRAMES 0x0100
663 * Codec is experimental and is thus avoided in favor of non experimental
666 #define CODEC_CAP_EXPERIMENTAL 0x0200
668 * Codec should fill in channel configuration and samplerate instead of container
670 #define CODEC_CAP_CHANNEL_CONF 0x0400
672 * Codec is able to deal with negative linesizes
674 #define CODEC_CAP_NEG_LINESIZES 0x0800
676 * Codec supports frame-level multithreading.
678 #define CODEC_CAP_FRAME_THREADS 0x1000
680 //The following defines may change, don't expect compatibility if you use them.
681 #define MB_TYPE_INTRA4x4 0x0001
682 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
683 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
684 #define MB_TYPE_16x16 0x0008
685 #define MB_TYPE_16x8 0x0010
686 #define MB_TYPE_8x16 0x0020
687 #define MB_TYPE_8x8 0x0040
688 #define MB_TYPE_INTERLACED 0x0080
689 #define MB_TYPE_DIRECT2 0x0100 //FIXME
690 #define MB_TYPE_ACPRED 0x0200
691 #define MB_TYPE_GMC 0x0400
692 #define MB_TYPE_SKIP 0x0800
693 #define MB_TYPE_P0L0 0x1000
694 #define MB_TYPE_P1L0 0x2000
695 #define MB_TYPE_P0L1 0x4000
696 #define MB_TYPE_P1L1 0x8000
697 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
698 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
699 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
700 #define MB_TYPE_QUANT 0x00010000
701 #define MB_TYPE_CBP 0x00020000
702 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
706 * This specifies the area which should be displayed.
707 * Note there may be multiple such areas for one frame.
709 typedef struct AVPanScan{
712 * - encoding: Set by user.
713 * - decoding: Set by libavcodec.
718 * width and height in 1/16 pel
719 * - encoding: Set by user.
720 * - decoding: Set by libavcodec.
726 * position of the top left corner in 1/16 pel for up to 3 fields/frames
727 * - encoding: Set by user.
728 * - decoding: Set by libavcodec.
730 int16_t position[3][2];
733 #define FF_COMMON_FRAME \
735 * pointer to the picture planes.\
736 * This might be different from the first allocated byte\
743 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
744 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
750 * 1 -> keyframe, 0-> not\
751 * - encoding: Set by libavcodec.\
752 * - decoding: Set by libavcodec.\
757 * Picture type of the frame, see ?_TYPE below.\
758 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
759 * - decoding: Set by libavcodec.\
764 * presentation timestamp in time_base units (time when frame should be shown to user)\
765 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
766 * - encoding: MUST be set by user.\
767 * - decoding: Set by libavcodec.\
772 * picture number in bitstream order\
773 * - encoding: set by\
774 * - decoding: Set by libavcodec.\
776 int coded_picture_number;\
778 * picture number in display order\
779 * - encoding: set by\
780 * - decoding: Set by libavcodec.\
782 int display_picture_number;\
785 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
786 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
787 * - decoding: Set by libavcodec.\
792 * buffer age (1->was last buffer and dint change, 2->..., ...).\
793 * Set to INT_MAX if the buffer has not been used yet.\
794 * - encoding: unused\
795 * - decoding: MUST be set by get_buffer().\
800 * is this picture used as reference\
801 * The values for this are the same as the MpegEncContext.picture_structure\
802 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
803 * Set to 4 for delayed, non-reference frames.\
804 * - encoding: unused\
805 * - decoding: Set by libavcodec. (before get_buffer() call)).\
811 * - encoding: unused\
812 * - decoding: Set by libavcodec.\
814 int8_t *qscale_table;\
817 * - encoding: unused\
818 * - decoding: Set by libavcodec.\
823 * mbskip_table[mb]>=1 if MB didn't change\
824 * stride= mb_width = (width+15)>>4\
825 * - encoding: unused\
826 * - decoding: Set by libavcodec.\
828 uint8_t *mbskip_table;\
831 * motion vector table\
834 * int mv_sample_log2= 4 - motion_subsample_log2;\
835 * int mb_width= (width+15)>>4;\
836 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
837 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
839 * - encoding: Set by user.\
840 * - decoding: Set by libavcodec.\
842 int16_t (*motion_val[2])[2];\
845 * macroblock type table\
846 * mb_type_base + mb_width + 2\
847 * - encoding: Set by user.\
848 * - decoding: Set by libavcodec.\
853 * log2 of the size of the block which a single vector in motion_val represents: \
854 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
855 * - encoding: unused\
856 * - decoding: Set by libavcodec.\
858 uint8_t motion_subsample_log2;\
861 * for some private data of the user\
862 * - encoding: unused\
863 * - decoding: Set by user.\
869 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
870 * - decoding: unused\
875 * type of the buffer (to keep track of who has to deallocate data[*])\
876 * - encoding: Set by the one who allocates it.\
877 * - decoding: Set by the one who allocates it.\
878 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
883 * When decoding, this signals how much the picture must be delayed.\
884 * extra_delay = repeat_pict / (2*fps)\
885 * - encoding: unused\
886 * - decoding: Set by libavcodec.\
896 * The content of the picture is interlaced.\
897 * - encoding: Set by user.\
898 * - decoding: Set by libavcodec. (default 0)\
900 int interlaced_frame;\
903 * If the content is interlaced, is top field displayed first.\
904 * - encoding: Set by user.\
905 * - decoding: Set by libavcodec.\
907 int top_field_first;\
911 * - encoding: Set by user.\
912 * - decoding: Set by libavcodec.\
914 AVPanScan *pan_scan;\
917 * Tell user application that palette has changed from previous frame.\
918 * - encoding: ??? (no palette-enabled encoder yet)\
919 * - decoding: Set by libavcodec. (default 0).\
921 int palette_has_changed;\
924 * codec suggestion on buffer type if != 0\
925 * - encoding: unused\
926 * - decoding: Set by libavcodec. (before get_buffer() call)).\
932 * - encoding: unused\
933 * - decoding: Set by libavcodec.\
938 * motion reference frame index\
939 * the order in which these are stored can depend on the codec.\
940 * - encoding: Set by user.\
941 * - decoding: Set by libavcodec.\
943 int8_t *ref_index[2];\
946 * reordered opaque 64bit (generally an integer or a double precision float\
947 * PTS but can be anything). \
948 * The user sets AVCodecContext.reordered_opaque to represent the input at\
950 * the decoder reorders values as needed and sets AVFrame.reordered_opaque\
951 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque \
952 * @deprecated in favor of pkt_pts\
953 * - encoding: unused\
954 * - decoding: Read by user.\
956 int64_t reordered_opaque;\
959 * hardware accelerator private data (FFmpeg allocated)\
960 * - encoding: unused\
961 * - decoding: Set by libavcodec\
963 void *hwaccel_picture_private;\
966 * reordered pts from the last AVPacket that has been input into the decoder\
967 * - encoding: unused\
968 * - decoding: Read by user.\
973 * dts from the last AVPacket that has been input into the decoder\
974 * - encoding: unused\
975 * - decoding: Read by user.\
980 * the AVCodecContext which ff_thread_get_buffer() was last called on\
981 * - encoding: Set by libavcodec.\
982 * - decoding: Set by libavcodec.\
984 struct AVCodecContext *owner;\
987 * used by multithreading to store frame-specific info\
988 * - encoding: Set by libavcodec.\
989 * - decoding: Set by libavcodec.\
991 void *thread_opaque;\
993 #define FF_QSCALE_TYPE_MPEG1 0
994 #define FF_QSCALE_TYPE_MPEG2 1
995 #define FF_QSCALE_TYPE_H264 2
996 #define FF_QSCALE_TYPE_VP56 3
998 #define FF_BUFFER_TYPE_INTERNAL 1
999 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1000 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1001 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1004 #define FF_I_TYPE 1 ///< Intra
1005 #define FF_P_TYPE 2 ///< Predicted
1006 #define FF_B_TYPE 3 ///< Bi-dir predicted
1007 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
1008 #define FF_SI_TYPE 5 ///< Switching Intra
1009 #define FF_SP_TYPE 6 ///< Switching Predicted
1010 #define FF_BI_TYPE 7
1012 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1013 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1014 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1015 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1017 enum AVPacketSideDataType {
1018 AV_PKT_DATA_PALETTE,
1021 typedef struct AVPacket {
1023 * Presentation timestamp in AVStream->time_base units; the time at which
1024 * the decompressed packet will be presented to the user.
1025 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1026 * pts MUST be larger or equal to dts as presentation cannot happen before
1027 * decompression, unless one wants to view hex dumps. Some formats misuse
1028 * the terms dts and pts/cts to mean something different. Such timestamps
1029 * must be converted to true pts/dts before they are stored in AVPacket.
1033 * Decompression timestamp in AVStream->time_base units; the time at which
1034 * the packet is decompressed.
1035 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1043 * Additional packet data that can be provided by the container.
1044 * Packet can contain several types of side information.
1049 enum AVPacketSideDataType type;
1051 int side_data_elems;
1054 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1055 * Equals next_pts - this_pts in presentation order.
1058 void (*destruct)(struct AVPacket *);
1060 int64_t pos; ///< byte position in stream, -1 if unknown
1063 * Time difference in AVStream->time_base units from the pts of this
1064 * packet to the point at which the output from the decoder has converged
1065 * independent from the availability of previous frames. That is, the
1066 * frames are virtually identical no matter if decoding started from
1067 * the very first frame or from this keyframe.
1068 * Is AV_NOPTS_VALUE if unknown.
1069 * This field is not the display duration of the current packet.
1070 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1073 * The purpose of this field is to allow seeking in streams that have no
1074 * keyframes in the conventional sense. It corresponds to the
1075 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1076 * essential for some types of subtitle streams to ensure that all
1077 * subtitles are correctly displayed after seeking.
1079 int64_t convergence_duration;
1081 #define AV_PKT_FLAG_KEY 0x0001
1084 * Audio Video Frame.
1085 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1087 * Removal, reordering and changes to existing fields require a major
1088 * version bump. No fields should be added into AVFrame before or after
1090 * sizeof(AVFrame) must not be used outside libav*.
1092 typedef struct AVFrame {
1097 * main external API structure.
1098 * New fields can be added to the end with minor version bumps.
1099 * Removal, reordering and changes to existing fields require a major
1101 * sizeof(AVCodecContext) must not be used outside libav*.
1103 typedef struct AVCodecContext {
1105 * information on struct for av_log
1106 * - set by avcodec_alloc_context
1108 const AVClass *av_class;
1110 * the average bitrate
1111 * - encoding: Set by user; unused for constant quantizer encoding.
1112 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1117 * number of bits the bitstream is allowed to diverge from the reference.
1118 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1119 * - encoding: Set by user; unused for constant quantizer encoding.
1120 * - decoding: unused
1122 int bit_rate_tolerance;
1126 * - encoding: Set by user.
1127 * - decoding: Set by user.
1132 * Some codecs need additional format info. It is stored here.
1133 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1134 * specific codec MUST set it correctly otherwise stream copy breaks.
1135 * In general use of this field by muxers is not recommanded.
1136 * - encoding: Set by libavcodec.
1137 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1142 * Motion estimation algorithm used for video coding.
1143 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1144 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1145 * - encoding: MUST be set by user.
1146 * - decoding: unused
1151 * some codecs need / can use extradata like Huffman tables.
1152 * mjpeg: Huffman tables
1153 * rv10: additional flags
1154 * mpeg4: global headers (they can be in the bitstream or here)
1155 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1156 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1157 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1158 * - encoding: Set/allocated/freed by libavcodec.
1159 * - decoding: Set/allocated/freed by user.
1165 * This is the fundamental unit of time (in seconds) in terms
1166 * of which frame timestamps are represented. For fixed-fps content,
1167 * timebase should be 1/framerate and timestamp increments should be
1169 * - encoding: MUST be set by user.
1170 * - decoding: Set by libavcodec.
1172 AVRational time_base;
1176 * picture width / height.
1177 * - encoding: MUST be set by user.
1178 * - decoding: Set by libavcodec.
1179 * Note: For compatibility it is possible to set this instead of
1180 * coded_width/height before decoding.
1184 #define FF_ASPECT_EXTENDED 15
1187 * the number of pictures in a group of pictures, or 0 for intra_only
1188 * - encoding: Set by user.
1189 * - decoding: unused
1194 * Pixel format, see PIX_FMT_xxx.
1195 * May be set by the demuxer if known from headers.
1196 * May be overriden by the decoder if it knows better.
1197 * - encoding: Set by user.
1198 * - decoding: Set by user if known, overridden by libavcodec if known
1200 enum PixelFormat pix_fmt;
1204 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1205 * has to read frames at native frame rate.
1206 * - encoding: Set by user.
1207 * - decoding: unused
1209 attribute_deprecated int rate_emu;
1213 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1214 * decoder to draw a horizontal band. It improves cache usage. Not
1215 * all codecs can do that. You must check the codec capabilities
1217 * When multithreading is used, it may be called from multiple threads
1218 * at the same time; threads might draw different parts of the same AVFrame,
1219 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1221 * The function is also used by hardware acceleration APIs.
1222 * It is called at least once during frame decoding to pass
1223 * the data needed for hardware render.
1224 * In that mode instead of pixel data, AVFrame points to
1225 * a structure specific to the acceleration API. The application
1226 * reads the structure and can change some fields to indicate progress
1228 * - encoding: unused
1229 * - decoding: Set by user.
1230 * @param height the height of the slice
1231 * @param y the y position of the slice
1232 * @param type 1->top field, 2->bottom field, 3->frame
1233 * @param offset offset into the AVFrame.data from which the slice should be read
1235 void (*draw_horiz_band)(struct AVCodecContext *s,
1236 const AVFrame *src, int offset[4],
1237 int y, int type, int height);
1240 int sample_rate; ///< samples per second
1241 int channels; ///< number of audio channels
1244 * audio sample format
1245 * - encoding: Set by user.
1246 * - decoding: Set by libavcodec.
1248 enum AVSampleFormat sample_fmt; ///< sample format
1250 /* The following data should not be initialized. */
1252 * Samples per packet, initialized when calling 'init'.
1255 int frame_number; ///< audio or video frame number
1258 * Number of frames the decoded output will be delayed relative to
1259 * the encoded input.
1260 * - encoding: Set by libavcodec.
1261 * - decoding: unused
1265 /* - encoding parameters */
1266 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1267 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1271 * - encoding: Set by user.
1272 * - decoding: unused
1278 * - encoding: Set by user.
1279 * - decoding: unused
1284 * maximum quantizer difference between frames
1285 * - encoding: Set by user.
1286 * - decoding: unused
1291 * maximum number of B-frames between non-B-frames
1292 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1293 * - encoding: Set by user.
1294 * - decoding: unused
1299 * qscale factor between IP and B-frames
1300 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1301 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1302 * - encoding: Set by user.
1303 * - decoding: unused
1305 float b_quant_factor;
1307 /** obsolete FIXME remove */
1309 #define FF_RC_STRATEGY_XVID 1
1311 int b_frame_strategy;
1316 * - encoding: unused
1317 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1318 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1320 attribute_deprecated int hurry_up;
1323 struct AVCodec *codec;
1327 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1328 /* do its best to deliver a chunk with size */
1329 /* below rtp_payload_size, the chunk will start */
1330 /* with a start code on some codecs like H.263. */
1331 /* This doesn't take account of any particular */
1332 /* headers inside the transmitted RTP payload. */
1335 /* The RTP callback: This function is called */
1336 /* every time the encoder has a packet to send. */
1337 /* It depends on the encoder if the data starts */
1338 /* with a Start Code (it should). H.263 does. */
1339 /* mb_nb contains the number of macroblocks */
1340 /* encoded in the RTP payload. */
1341 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1343 /* statistics, used for 2-pass encoding */
1354 * number of bits used for the previously encoded frame
1355 * - encoding: Set by libavcodec.
1356 * - decoding: unused
1361 * Private data of the user, can be used to carry app specific stuff.
1362 * - encoding: Set by user.
1363 * - decoding: Set by user.
1367 char codec_name[32];
1368 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1369 enum CodecID codec_id; /* see CODEC_ID_xxx */
1372 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1373 * This is used to work around some encoder bugs.
1374 * A demuxer should set this to what is stored in the field used to identify the codec.
1375 * If there are multiple such fields in a container then the demuxer should choose the one
1376 * which maximizes the information about the used codec.
1377 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1378 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1379 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1381 * - encoding: Set by user, if not then the default based on codec_id will be used.
1382 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1384 unsigned int codec_tag;
1387 * Work around bugs in encoders which sometimes cannot be detected automatically.
1388 * - encoding: Set by user
1389 * - decoding: Set by user
1391 int workaround_bugs;
1392 #define FF_BUG_AUTODETECT 1 ///< autodetection
1393 #define FF_BUG_OLD_MSMPEG4 2
1394 #define FF_BUG_XVID_ILACE 4
1395 #define FF_BUG_UMP4 8
1396 #define FF_BUG_NO_PADDING 16
1397 #define FF_BUG_AMV 32
1398 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1399 #define FF_BUG_QPEL_CHROMA 64
1400 #define FF_BUG_STD_QPEL 128
1401 #define FF_BUG_QPEL_CHROMA2 256
1402 #define FF_BUG_DIRECT_BLOCKSIZE 512
1403 #define FF_BUG_EDGE 1024
1404 #define FF_BUG_HPEL_CHROMA 2048
1405 #define FF_BUG_DC_CLIP 4096
1406 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1407 #define FF_BUG_TRUNCATED 16384
1408 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1411 * luma single coefficient elimination threshold
1412 * - encoding: Set by user.
1413 * - decoding: unused
1415 int luma_elim_threshold;
1418 * chroma single coeff elimination threshold
1419 * - encoding: Set by user.
1420 * - decoding: unused
1422 int chroma_elim_threshold;
1425 * strictly follow the standard (MPEG4, ...).
1426 * - encoding: Set by user.
1427 * - decoding: Set by user.
1428 * Setting this to STRICT or higher means the encoder and decoder will
1429 * generally do stupid things, whereas setting it to unofficial or lower
1430 * will mean the encoder might produce output that is not supported by all
1431 * spec-compliant decoders. Decoders don't differentiate between normal,
1432 * unofficial and experimental (that is, they always try to decode things
1433 * when they can) unless they are explicitly asked to behave stupidly
1434 * (=strictly conform to the specs)
1436 int strict_std_compliance;
1437 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1438 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1439 #define FF_COMPLIANCE_NORMAL 0
1440 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1441 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1444 * qscale offset between IP and B-frames
1445 * - encoding: Set by user.
1446 * - decoding: unused
1448 float b_quant_offset;
1451 * Error recognization; higher values will detect more errors but may
1452 * misdetect some more or less valid parts as errors.
1453 * - encoding: unused
1454 * - decoding: Set by user.
1456 int error_recognition;
1457 #define FF_ER_CAREFUL 1
1458 #define FF_ER_COMPLIANT 2
1459 #define FF_ER_AGGRESSIVE 3
1460 #define FF_ER_VERY_AGGRESSIVE 4
1463 * Called at the beginning of each frame to get a buffer for it.
1464 * If pic.reference is set then the frame will be read later by libavcodec.
1465 * avcodec_align_dimensions2() should be used to find the required width and
1466 * height, as they normally need to be rounded up to the next multiple of 16.
1467 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1468 * avcodec_default_get_buffer() instead of providing buffers allocated by
1470 * If frame multithreading is used and thread_safe_callbacks is set,
1471 * it may be called from a different thread, but not from more than one at once.
1472 * Does not need to be reentrant.
1473 * - encoding: unused
1474 * - decoding: Set by libavcodec, user can override.
1476 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1479 * Called to release buffers which were allocated with get_buffer.
1480 * A released buffer can be reused in get_buffer().
1481 * pic.data[*] must be set to NULL.
1482 * May be called from a different thread if frame multithreading is used,
1483 * but not by more than one thread at once, so does not need to be reentrant.
1484 * - encoding: unused
1485 * - decoding: Set by libavcodec, user can override.
1487 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1490 * Size of the frame reordering buffer in the decoder.
1491 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1492 * - encoding: Set by libavcodec.
1493 * - decoding: Set by libavcodec.
1498 * number of bytes per packet if constant and known or 0
1499 * Used by some WAV based audio codecs.
1503 int parse_only; /* - decoding only: If true, only parsing is done
1504 (function avcodec_parse_frame()). The frame
1505 data is returned. Only MPEG codecs support this now. */
1508 * 0-> h263 quant 1-> mpeg quant
1509 * - encoding: Set by user.
1510 * - decoding: unused
1515 * pass1 encoding statistics output buffer
1516 * - encoding: Set by libavcodec.
1517 * - decoding: unused
1522 * pass2 encoding statistics input buffer
1523 * Concatenated stuff from stats_out of pass1 should be placed here.
1524 * - encoding: Allocated/set/freed by user.
1525 * - decoding: unused
1530 * ratecontrol qmin qmax limiting method
1531 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1532 * - encoding: Set by user.
1533 * - decoding: unused
1541 * ratecontrol override, see RcOverride
1542 * - encoding: Allocated/set/freed by user.
1543 * - decoding: unused
1545 RcOverride *rc_override;
1546 int rc_override_count;
1549 * rate control equation
1550 * - encoding: Set by user
1551 * - decoding: unused
1557 * - encoding: Set by user.
1558 * - decoding: unused
1564 * - encoding: Set by user.
1565 * - decoding: unused
1570 * decoder bitstream buffer size
1571 * - encoding: Set by user.
1572 * - decoding: unused
1575 float rc_buffer_aggressivity;
1578 * qscale factor between P and I-frames
1579 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1580 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1581 * - encoding: Set by user.
1582 * - decoding: unused
1584 float i_quant_factor;
1587 * qscale offset between P and I-frames
1588 * - encoding: Set by user.
1589 * - decoding: unused
1591 float i_quant_offset;
1594 * initial complexity for pass1 ratecontrol
1595 * - encoding: Set by user.
1596 * - decoding: unused
1598 float rc_initial_cplx;
1601 * DCT algorithm, see FF_DCT_* below
1602 * - encoding: Set by user.
1603 * - decoding: unused
1606 #define FF_DCT_AUTO 0
1607 #define FF_DCT_FASTINT 1
1608 #define FF_DCT_INT 2
1609 #define FF_DCT_MMX 3
1610 #define FF_DCT_MLIB 4
1611 #define FF_DCT_ALTIVEC 5
1612 #define FF_DCT_FAAN 6
1615 * luminance masking (0-> disabled)
1616 * - encoding: Set by user.
1617 * - decoding: unused
1622 * temporary complexity masking (0-> disabled)
1623 * - encoding: Set by user.
1624 * - decoding: unused
1626 float temporal_cplx_masking;
1629 * spatial complexity masking (0-> disabled)
1630 * - encoding: Set by user.
1631 * - decoding: unused
1633 float spatial_cplx_masking;
1636 * p block masking (0-> disabled)
1637 * - encoding: Set by user.
1638 * - decoding: unused
1643 * darkness masking (0-> disabled)
1644 * - encoding: Set by user.
1645 * - decoding: unused
1650 * IDCT algorithm, see FF_IDCT_* below.
1651 * - encoding: Set by user.
1652 * - decoding: Set by user.
1655 #define FF_IDCT_AUTO 0
1656 #define FF_IDCT_INT 1
1657 #define FF_IDCT_SIMPLE 2
1658 #define FF_IDCT_SIMPLEMMX 3
1659 #define FF_IDCT_LIBMPEG2MMX 4
1660 #define FF_IDCT_PS2 5
1661 #define FF_IDCT_MLIB 6
1662 #define FF_IDCT_ARM 7
1663 #define FF_IDCT_ALTIVEC 8
1664 #define FF_IDCT_SH4 9
1665 #define FF_IDCT_SIMPLEARM 10
1666 #define FF_IDCT_H264 11
1667 #define FF_IDCT_VP3 12
1668 #define FF_IDCT_IPP 13
1669 #define FF_IDCT_XVIDMMX 14
1670 #define FF_IDCT_CAVS 15
1671 #define FF_IDCT_SIMPLEARMV5TE 16
1672 #define FF_IDCT_SIMPLEARMV6 17
1673 #define FF_IDCT_SIMPLEVIS 18
1674 #define FF_IDCT_WMV2 19
1675 #define FF_IDCT_FAAN 20
1676 #define FF_IDCT_EA 21
1677 #define FF_IDCT_SIMPLENEON 22
1678 #define FF_IDCT_SIMPLEALPHA 23
1679 #define FF_IDCT_BINK 24
1683 * - encoding: Set by libavcodec.
1684 * - decoding: Set by user (or 0).
1688 * slice offsets in the frame in bytes
1689 * - encoding: Set/allocated by libavcodec.
1690 * - decoding: Set/allocated by user (or NULL).
1695 * error concealment flags
1696 * - encoding: unused
1697 * - decoding: Set by user.
1699 int error_concealment;
1700 #define FF_EC_GUESS_MVS 1
1701 #define FF_EC_DEBLOCK 2
1704 * dsp_mask could be add used to disable unwanted CPU features
1705 * CPU features (i.e. MMX, SSE. ...)
1707 * With the FORCE flag you may instead enable given CPU features.
1708 * (Dangerous: Usable in case of misdetection, improper usage however will
1709 * result into program crash.)
1714 * bits per sample/pixel from the demuxer (needed for huffyuv).
1715 * - encoding: Set by libavcodec.
1716 * - decoding: Set by user.
1718 int bits_per_coded_sample;
1721 * prediction method (needed for huffyuv)
1722 * - encoding: Set by user.
1723 * - decoding: unused
1725 int prediction_method;
1726 #define FF_PRED_LEFT 0
1727 #define FF_PRED_PLANE 1
1728 #define FF_PRED_MEDIAN 2
1731 * sample aspect ratio (0 if unknown)
1732 * That is the width of a pixel divided by the height of the pixel.
1733 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1734 * - encoding: Set by user.
1735 * - decoding: Set by libavcodec.
1737 AVRational sample_aspect_ratio;
1740 * the picture in the bitstream
1741 * - encoding: Set by libavcodec.
1742 * - decoding: Set by libavcodec.
1744 AVFrame *coded_frame;
1748 * - encoding: Set by user.
1749 * - decoding: Set by user.
1752 #define FF_DEBUG_PICT_INFO 1
1753 #define FF_DEBUG_RC 2
1754 #define FF_DEBUG_BITSTREAM 4
1755 #define FF_DEBUG_MB_TYPE 8
1756 #define FF_DEBUG_QP 16
1757 #define FF_DEBUG_MV 32
1758 #define FF_DEBUG_DCT_COEFF 0x00000040
1759 #define FF_DEBUG_SKIP 0x00000080
1760 #define FF_DEBUG_STARTCODE 0x00000100
1761 #define FF_DEBUG_PTS 0x00000200
1762 #define FF_DEBUG_ER 0x00000400
1763 #define FF_DEBUG_MMCO 0x00000800
1764 #define FF_DEBUG_BUGS 0x00001000
1765 #define FF_DEBUG_VIS_QP 0x00002000
1766 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1767 #define FF_DEBUG_BUFFERS 0x00008000
1768 #define FF_DEBUG_THREADS 0x00010000
1772 * - encoding: Set by user.
1773 * - decoding: Set by user.
1776 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1777 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1778 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1782 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1783 * - decoding: unused
1789 * minimum MB quantizer
1790 * - encoding: unused
1791 * - decoding: unused
1793 attribute_deprecated int mb_qmin;
1796 * maximum MB quantizer
1797 * - encoding: unused
1798 * - decoding: unused
1800 attribute_deprecated int mb_qmax;
1804 * motion estimation comparison function
1805 * - encoding: Set by user.
1806 * - decoding: unused
1810 * subpixel motion estimation comparison function
1811 * - encoding: Set by user.
1812 * - decoding: unused
1816 * macroblock comparison function (not supported yet)
1817 * - encoding: Set by user.
1818 * - decoding: unused
1822 * interlaced DCT comparison function
1823 * - encoding: Set by user.
1824 * - decoding: unused
1827 #define FF_CMP_SAD 0
1828 #define FF_CMP_SSE 1
1829 #define FF_CMP_SATD 2
1830 #define FF_CMP_DCT 3
1831 #define FF_CMP_PSNR 4
1832 #define FF_CMP_BIT 5
1834 #define FF_CMP_ZERO 7
1835 #define FF_CMP_VSAD 8
1836 #define FF_CMP_VSSE 9
1837 #define FF_CMP_NSSE 10
1838 #define FF_CMP_W53 11
1839 #define FF_CMP_W97 12
1840 #define FF_CMP_DCTMAX 13
1841 #define FF_CMP_DCT264 14
1842 #define FF_CMP_CHROMA 256
1845 * ME diamond size & shape
1846 * - encoding: Set by user.
1847 * - decoding: unused
1852 * amount of previous MV predictors (2a+1 x 2a+1 square)
1853 * - encoding: Set by user.
1854 * - decoding: unused
1856 int last_predictor_count;
1859 * prepass for motion estimation
1860 * - encoding: Set by user.
1861 * - decoding: unused
1866 * motion estimation prepass comparison function
1867 * - encoding: Set by user.
1868 * - decoding: unused
1873 * ME prepass diamond size & shape
1874 * - encoding: Set by user.
1875 * - decoding: unused
1881 * - encoding: Set by user.
1882 * - decoding: unused
1884 int me_subpel_quality;
1887 * callback to negotiate the pixelFormat
1888 * @param fmt is the list of formats which are supported by the codec,
1889 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1890 * The first is always the native one.
1891 * @return the chosen format
1892 * - encoding: unused
1893 * - decoding: Set by user, if not set the native format will be chosen.
1895 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1898 * DTG active format information (additional aspect ratio
1899 * information only used in DVB MPEG-2 transport streams)
1902 * - encoding: unused
1903 * - decoding: Set by decoder.
1905 int dtg_active_format;
1906 #define FF_DTG_AFD_SAME 8
1907 #define FF_DTG_AFD_4_3 9
1908 #define FF_DTG_AFD_16_9 10
1909 #define FF_DTG_AFD_14_9 11
1910 #define FF_DTG_AFD_4_3_SP_14_9 13
1911 #define FF_DTG_AFD_16_9_SP_14_9 14
1912 #define FF_DTG_AFD_SP_4_3 15
1915 * maximum motion estimation search range in subpel units
1916 * If 0 then no limit.
1918 * - encoding: Set by user.
1919 * - decoding: unused
1924 * intra quantizer bias
1925 * - encoding: Set by user.
1926 * - decoding: unused
1928 int intra_quant_bias;
1929 #define FF_DEFAULT_QUANT_BIAS 999999
1932 * inter quantizer bias
1933 * - encoding: Set by user.
1934 * - decoding: unused
1936 int inter_quant_bias;
1940 * - encoding: unused
1941 * - decoding: Which clrtable should be used for 8bit RGB images.
1942 * Tables have to be stored somewhere. FIXME
1947 * internal_buffer count
1948 * Don't touch, used by libavcodec default_get_buffer().
1950 int internal_buffer_count;
1954 * Don't touch, used by libavcodec default_get_buffer().
1956 void *internal_buffer;
1959 * Global quality for codecs which cannot change it per frame.
1960 * This should be proportional to MPEG-1/2/4 qscale.
1961 * - encoding: Set by user.
1962 * - decoding: unused
1966 #define FF_CODER_TYPE_VLC 0
1967 #define FF_CODER_TYPE_AC 1
1968 #define FF_CODER_TYPE_RAW 2
1969 #define FF_CODER_TYPE_RLE 3
1970 #define FF_CODER_TYPE_DEFLATE 4
1973 * - encoding: Set by user.
1974 * - decoding: unused
1980 * - encoding: Set by user.
1981 * - decoding: unused
1987 * - encoding: unused
1988 * - decoding: Set by user.
1990 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1995 * - encoding: unused
1996 * - decoding: Set by user.
1999 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2000 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2001 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2004 * XVideo Motion Acceleration
2005 * - encoding: forbidden
2006 * - decoding: set by decoder
2008 int xvmc_acceleration;
2011 * macroblock decision mode
2012 * - encoding: Set by user.
2013 * - decoding: unused
2016 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2017 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2018 #define FF_MB_DECISION_RD 2 ///< rate distortion
2021 * custom intra quantization matrix
2022 * - encoding: Set by user, can be NULL.
2023 * - decoding: Set by libavcodec.
2025 uint16_t *intra_matrix;
2028 * custom inter quantization matrix
2029 * - encoding: Set by user, can be NULL.
2030 * - decoding: Set by libavcodec.
2032 uint16_t *inter_matrix;
2035 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2036 * This is used to work around some encoder bugs.
2037 * - encoding: unused
2038 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2040 unsigned int stream_codec_tag;
2043 * scene change detection threshold
2044 * 0 is default, larger means fewer detected scene changes.
2045 * - encoding: Set by user.
2046 * - decoding: unused
2048 int scenechange_threshold;
2051 * minimum Lagrange multipler
2052 * - encoding: Set by user.
2053 * - decoding: unused
2058 * maximum Lagrange multipler
2059 * - encoding: Set by user.
2060 * - decoding: unused
2064 #if FF_API_PALETTE_CONTROL
2066 * palette control structure
2067 * - encoding: ??? (no palette-enabled encoder yet)
2068 * - decoding: Set by user.
2070 struct AVPaletteControl *palctrl;
2074 * noise reduction strength
2075 * - encoding: Set by user.
2076 * - decoding: unused
2078 int noise_reduction;
2081 * Called at the beginning of a frame to get cr buffer for it.
2082 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2083 * libavcodec will pass previous buffer in pic, function should return
2084 * same buffer or new buffer with old frame "painted" into it.
2085 * If pic.data[0] == NULL must behave like get_buffer().
2086 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2087 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2089 * - encoding: unused
2090 * - decoding: Set by libavcodec, user can override.
2092 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2095 * Number of bits which should be loaded into the rc buffer before decoding starts.
2096 * - encoding: Set by user.
2097 * - decoding: unused
2099 int rc_initial_buffer_occupancy;
2103 * - encoding: Set by user.
2104 * - decoding: unused
2106 int inter_threshold;
2110 * - encoding: Set by user.
2111 * - decoding: Set by user.
2116 * Simulates errors in the bitstream to test error concealment.
2117 * - encoding: Set by user.
2118 * - decoding: unused
2122 #if FF_API_ANTIALIAS_ALGO
2124 * MP3 antialias algorithm, see FF_AA_* below.
2125 * - encoding: unused
2126 * - decoding: Set by user.
2128 attribute_deprecated int antialias_algo;
2129 #define FF_AA_AUTO 0
2130 #define FF_AA_FASTINT 1 //not implemented yet
2132 #define FF_AA_FLOAT 3
2136 * quantizer noise shaping
2137 * - encoding: Set by user.
2138 * - decoding: unused
2140 int quantizer_noise_shaping;
2144 * is used to decide how many independent tasks should be passed to execute()
2145 * - encoding: Set by user.
2146 * - decoding: Set by user.
2151 * The codec may call this to execute several independent things.
2152 * It will return only after finishing all tasks.
2153 * The user may replace this with some multithreaded implementation,
2154 * the default implementation will execute the parts serially.
2155 * @param count the number of things to execute
2156 * - encoding: Set by libavcodec, user can override.
2157 * - decoding: Set by libavcodec, user can override.
2159 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2163 * Can be used by execute() to store some per AVCodecContext stuff.
2164 * - encoding: set by execute()
2165 * - decoding: set by execute()
2167 void *thread_opaque;
2170 * Motion estimation threshold below which no motion estimation is
2171 * performed, but instead the user specified motion vectors are used.
2173 * - encoding: Set by user.
2174 * - decoding: unused
2179 * Macroblock threshold below which the user specified macroblock types will be used.
2180 * - encoding: Set by user.
2181 * - decoding: unused
2186 * precision of the intra DC coefficient - 8
2187 * - encoding: Set by user.
2188 * - decoding: unused
2190 int intra_dc_precision;
2193 * noise vs. sse weight for the nsse comparsion function
2194 * - encoding: Set by user.
2195 * - decoding: unused
2200 * Number of macroblock rows at the top which are skipped.
2201 * - encoding: unused
2202 * - decoding: Set by user.
2207 * Number of macroblock rows at the bottom which are skipped.
2208 * - encoding: unused
2209 * - decoding: Set by user.
2215 * - encoding: Set by user.
2216 * - decoding: Set by libavcodec.
2219 #define FF_PROFILE_UNKNOWN -99
2220 #define FF_PROFILE_RESERVED -100
2222 #define FF_PROFILE_AAC_MAIN 0
2223 #define FF_PROFILE_AAC_LOW 1
2224 #define FF_PROFILE_AAC_SSR 2
2225 #define FF_PROFILE_AAC_LTP 3
2227 #define FF_PROFILE_DTS 20
2228 #define FF_PROFILE_DTS_ES 30
2229 #define FF_PROFILE_DTS_96_24 40
2230 #define FF_PROFILE_DTS_HD_HRA 50
2231 #define FF_PROFILE_DTS_HD_MA 60
2233 #define FF_PROFILE_MPEG2_422 0
2234 #define FF_PROFILE_MPEG2_HIGH 1
2235 #define FF_PROFILE_MPEG2_SS 2
2236 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2237 #define FF_PROFILE_MPEG2_MAIN 4
2238 #define FF_PROFILE_MPEG2_SIMPLE 5
2240 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2241 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2243 #define FF_PROFILE_H264_BASELINE 66
2244 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2245 #define FF_PROFILE_H264_MAIN 77
2246 #define FF_PROFILE_H264_EXTENDED 88
2247 #define FF_PROFILE_H264_HIGH 100
2248 #define FF_PROFILE_H264_HIGH_10 110
2249 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2250 #define FF_PROFILE_H264_HIGH_422 122
2251 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2252 #define FF_PROFILE_H264_HIGH_444 144
2253 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2254 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2255 #define FF_PROFILE_H264_CAVLC_444 44
2257 #define FF_PROFILE_VC1_SIMPLE 0
2258 #define FF_PROFILE_VC1_MAIN 1
2259 #define FF_PROFILE_VC1_COMPLEX 2
2260 #define FF_PROFILE_VC1_ADVANCED 3
2264 * - encoding: Set by user.
2265 * - decoding: Set by libavcodec.
2268 #define FF_LEVEL_UNKNOWN -99
2271 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2272 * - encoding: unused
2273 * - decoding: Set by user.
2278 * Bitstream width / height, may be different from width/height if lowres
2279 * or other things are used.
2280 * - encoding: unused
2281 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2283 int coded_width, coded_height;
2286 * frame skip threshold
2287 * - encoding: Set by user.
2288 * - decoding: unused
2290 int frame_skip_threshold;
2294 * - encoding: Set by user.
2295 * - decoding: unused
2297 int frame_skip_factor;
2300 * frame skip exponent
2301 * - encoding: Set by user.
2302 * - decoding: unused
2307 * frame skip comparison function
2308 * - encoding: Set by user.
2309 * - decoding: unused
2314 * Border processing masking, raises the quantizer for mbs on the borders
2316 * - encoding: Set by user.
2317 * - decoding: unused
2319 float border_masking;
2322 * minimum MB lagrange multipler
2323 * - encoding: Set by user.
2324 * - decoding: unused
2329 * maximum MB lagrange multipler
2330 * - encoding: Set by user.
2331 * - decoding: unused
2337 * - encoding: Set by user.
2338 * - decoding: unused
2340 int me_penalty_compensation;
2344 * - encoding: unused
2345 * - decoding: Set by user.
2347 enum AVDiscard skip_loop_filter;
2351 * - encoding: unused
2352 * - decoding: Set by user.
2354 enum AVDiscard skip_idct;
2358 * - encoding: unused
2359 * - decoding: Set by user.
2361 enum AVDiscard skip_frame;
2365 * - encoding: Set by user.
2366 * - decoding: unused
2372 * - encoding: Set by user.
2373 * - decoding: unused
2378 * constant rate factor - quality-based VBR - values ~correspond to qps
2379 * - encoding: Set by user.
2380 * - decoding: unused
2385 * constant quantization parameter rate control method
2386 * - encoding: Set by user.
2387 * - decoding: unused
2393 * - encoding: Set by user.
2394 * - decoding: unused
2399 * number of reference frames
2400 * - encoding: Set by user.
2401 * - decoding: Set by lavc.
2406 * chroma qp offset from luma
2407 * - encoding: Set by user.
2408 * - decoding: unused
2413 * Influences how often B-frames are used.
2414 * - encoding: Set by user.
2415 * - decoding: unused
2420 * trellis RD quantization
2421 * - encoding: Set by user.
2422 * - decoding: unused
2427 * Reduce fluctuations in qp (before curve compression).
2428 * - encoding: Set by user.
2429 * - decoding: unused
2431 float complexityblur;
2434 * in-loop deblocking filter alphac0 parameter
2435 * alpha is in the range -6...6
2436 * - encoding: Set by user.
2437 * - decoding: unused
2442 * in-loop deblocking filter beta parameter
2443 * beta is in the range -6...6
2444 * - encoding: Set by user.
2445 * - decoding: unused
2450 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2451 * - encoding: Set by user.
2452 * - decoding: unused
2455 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2456 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2457 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2458 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2459 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2462 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2463 * - encoding: Set by user.
2464 * - decoding: unused
2469 * Audio cutoff bandwidth (0 means "automatic")
2470 * - encoding: Set by user.
2471 * - decoding: unused
2476 * Multiplied by qscale for each frame and added to scene_change_score.
2477 * - encoding: Set by user.
2478 * - decoding: unused
2480 int scenechange_factor;
2484 * Note: Value depends upon the compare function used for fullpel ME.
2485 * - encoding: Set by user.
2486 * - decoding: unused
2491 * Adjusts sensitivity of b_frame_strategy 1.
2492 * - encoding: Set by user.
2493 * - decoding: unused
2498 * - encoding: Set by user.
2499 * - decoding: unused
2501 int compression_level;
2502 #define FF_COMPRESSION_DEFAULT -1
2505 * LPC coefficient precision - used by FLAC encoder
2506 * - encoding: Set by user.
2507 * - decoding: unused
2509 int lpc_coeff_precision;
2512 * - encoding: Set by user.
2513 * - decoding: unused
2515 int min_prediction_order;
2518 * - encoding: Set by user.
2519 * - decoding: unused
2521 int max_prediction_order;
2524 * search method for selecting prediction order
2525 * - encoding: Set by user.
2526 * - decoding: unused
2528 int prediction_order_method;
2531 * - encoding: Set by user.
2532 * - decoding: unused
2534 int min_partition_order;
2537 * - encoding: Set by user.
2538 * - decoding: unused
2540 int max_partition_order;
2543 * GOP timecode frame start number, in non drop frame format
2544 * - encoding: Set by user.
2545 * - decoding: unused
2547 int64_t timecode_frame_start;
2549 #if FF_API_REQUEST_CHANNELS
2551 * Decoder should decode to this many channels if it can (0 for default)
2552 * - encoding: unused
2553 * - decoding: Set by user.
2554 * @deprecated Deprecated in favor of request_channel_layout.
2556 int request_channels;
2560 * Percentage of dynamic range compression to be applied by the decoder.
2561 * The default value is 1.0, corresponding to full compression.
2562 * - encoding: unused
2563 * - decoding: Set by user.
2568 * opaque 64bit number (generally a PTS) that will be reordered and
2569 * output in AVFrame.reordered_opaque
2570 * @deprecated in favor of pkt_pts
2571 * - encoding: unused
2572 * - decoding: Set by user.
2574 int64_t reordered_opaque;
2577 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2578 * This field is applicable only when sample_fmt is AV_SAMPLE_FMT_S32.
2579 * - encoding: set by user.
2580 * - decoding: set by libavcodec.
2582 int bits_per_raw_sample;
2585 * Audio channel layout.
2586 * - encoding: set by user.
2587 * - decoding: set by libavcodec.
2589 int64_t channel_layout;
2592 * Request decoder to use this channel layout if it can (0 for default)
2593 * - encoding: unused
2594 * - decoding: Set by user.
2596 int64_t request_channel_layout;
2599 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2600 * - encoding: Set by user.
2601 * - decoding: unused.
2603 float rc_max_available_vbv_use;
2606 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2607 * - encoding: Set by user.
2608 * - decoding: unused.
2610 float rc_min_vbv_overflow_use;
2613 * Hardware accelerator in use
2614 * - encoding: unused.
2615 * - decoding: Set by libavcodec
2617 struct AVHWAccel *hwaccel;
2620 * For some codecs, the time base is closer to the field rate than the frame rate.
2621 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2622 * if no telecine is used ...
2624 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2626 int ticks_per_frame;
2629 * Hardware accelerator context.
2630 * For some hardware accelerators, a global context needs to be
2631 * provided by the user. In that case, this holds display-dependent
2632 * data FFmpeg cannot instantiate itself. Please refer to the
2633 * FFmpeg HW accelerator documentation to know how to fill this
2634 * is. e.g. for VA API, this is a struct vaapi_context.
2635 * - encoding: unused
2636 * - decoding: Set by user
2638 void *hwaccel_context;
2641 * Chromaticity coordinates of the source primaries.
2642 * - encoding: Set by user
2643 * - decoding: Set by libavcodec
2645 enum AVColorPrimaries color_primaries;
2648 * Color Transfer Characteristic.
2649 * - encoding: Set by user
2650 * - decoding: Set by libavcodec
2652 enum AVColorTransferCharacteristic color_trc;
2655 * YUV colorspace type.
2656 * - encoding: Set by user
2657 * - decoding: Set by libavcodec
2659 enum AVColorSpace colorspace;
2662 * MPEG vs JPEG YUV range.
2663 * - encoding: Set by user
2664 * - decoding: Set by libavcodec
2666 enum AVColorRange color_range;
2669 * This defines the location of chroma samples.
2670 * - encoding: Set by user
2671 * - decoding: Set by libavcodec
2673 enum AVChromaLocation chroma_sample_location;
2676 * The codec may call this to execute several independent things.
2677 * It will return only after finishing all tasks.
2678 * The user may replace this with some multithreaded implementation,
2679 * the default implementation will execute the parts serially.
2680 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2681 * @param c context passed also to func
2682 * @param count the number of things to execute
2683 * @param arg2 argument passed unchanged to func
2684 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2685 * @param func function that will be called count times, with jobnr from 0 to count-1.
2686 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2687 * two instances of func executing at the same time will have the same threadnr.
2688 * @return always 0 currently, but code should handle a future improvement where when any call to func
2689 * returns < 0 no further calls to func may be done and < 0 is returned.
2690 * - encoding: Set by libavcodec, user can override.
2691 * - decoding: Set by libavcodec, user can override.
2693 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2696 * explicit P-frame weighted prediction analysis method
2698 * 1: fast blind weighting (one reference duplicate with -1 offset)
2699 * 2: smart weighting (full fade detection analysis)
2700 * - encoding: Set by user.
2701 * - decoding: unused
2703 int weighted_p_pred;
2708 * 1: Variance AQ (complexity mask)
2709 * 2: Auto-variance AQ (experimental)
2710 * - encoding: Set by user
2711 * - decoding: unused
2717 * Reduces blocking and blurring in flat and textured areas.
2718 * - encoding: Set by user
2719 * - decoding: unused
2725 * Strength of psychovisual optimization
2726 * - encoding: Set by user
2727 * - decoding: unused
2733 * Strength of psychovisual optimization
2734 * - encoding: Set by user
2735 * - decoding: unused
2741 * Number of frames for frametype and ratecontrol lookahead
2742 * - encoding: Set by user
2743 * - decoding: unused
2748 * Constant rate factor maximum
2749 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2750 * than crf_max, even if doing so would violate VBV restrictions.
2751 * - encoding: Set by user.
2752 * - decoding: unused
2756 int log_level_offset;
2759 * Determines which LPC analysis algorithm to use.
2760 * - encoding: Set by user
2761 * - decoding: unused
2763 enum AVLPCType lpc_type;
2766 * Number of passes to use for Cholesky factorization during LPC analysis
2767 * - encoding: Set by user
2768 * - decoding: unused
2774 * Indicates number of picture subdivisions. Used for parallelized
2776 * - encoding: Set by user
2777 * - decoding: unused
2782 * Header containing style information for text subtitles.
2783 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2784 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2785 * the Format line following. It shouldn't include any Dialogue line.
2786 * - encoding: Set/allocated/freed by user (before avcodec_open())
2787 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2789 uint8_t *subtitle_header;
2790 int subtitle_header_size;
2793 * Current packet as passed into the decoder, to avoid having
2794 * to pass the packet into every function. Currently only valid
2795 * inside lavc and get/release_buffer callbacks.
2796 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2797 * - encoding: unused
2802 * Whether this is a copy of the context which had init() called on it.
2803 * This is used by multithreading - shared tables and picture pointers
2804 * should be freed from the original context only.
2805 * - encoding: Set by libavcodec.
2806 * - decoding: Set by libavcodec.
2811 * Which multithreading methods to use.
2812 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2813 * so clients which cannot provide future frames should not use it.
2815 * - encoding: Set by user, otherwise the default is used.
2816 * - decoding: Set by user, otherwise the default is used.
2819 #define FF_THREAD_FRAME 1 //< Decode more than one frame at once
2820 #define FF_THREAD_SLICE 2 //< Decode more than one part of a single frame at once
2823 * Which multithreading methods are in use by the codec.
2824 * - encoding: Set by libavcodec.
2825 * - decoding: Set by libavcodec.
2827 int active_thread_type;
2830 * Set by the client if its custom get_buffer() callback can be called
2831 * from another thread, which allows faster multithreaded decoding.
2832 * draw_horiz_band() will be called from other threads regardless of this setting.
2833 * Ignored if the default get_buffer() is used.
2834 * - encoding: Set by user.
2835 * - decoding: Set by user.
2837 int thread_safe_callbacks;
2840 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2841 * Used for compliant TS muxing.
2842 * - encoding: Set by libavcodec.
2843 * - decoding: unused.
2848 * Type of service that the audio stream conveys.
2849 * - encoding: Set by user.
2850 * - decoding: Set by libavcodec.
2852 enum AVAudioServiceType audio_service_type;
2858 typedef struct AVProfile {
2860 const char *name; ///< short name for the profile
2866 typedef struct AVCodec {
2868 * Name of the codec implementation.
2869 * The name is globally unique among encoders and among decoders (but an
2870 * encoder and a decoder can share the same name).
2871 * This is the primary way to find a codec from the user perspective.
2874 enum AVMediaType type;
2877 int (*init)(AVCodecContext *);
2878 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2879 int (*close)(AVCodecContext *);
2880 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2882 * Codec capabilities.
2886 struct AVCodec *next;
2889 * Will be called when seeking
2891 void (*flush)(AVCodecContext *);
2892 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2893 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2895 * Descriptive name for the codec, meant to be more human readable than name.
2896 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2898 const char *long_name;
2899 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2900 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2901 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2902 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2903 const AVClass *priv_class; ///< AVClass for the private context
2904 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2907 * @defgroup framethreading Frame-level threading support functions.
2911 * If defined, called on thread contexts when they are created.
2912 * If the codec allocates writable tables in init(), re-allocate them here.
2913 * priv_data will be set to a copy of the original.
2915 int (*init_thread_copy)(AVCodecContext *);
2917 * Copy necessary context variables from a previous thread context to the current one.
2918 * If not defined, the next thread will start automatically; otherwise, the codec
2919 * must call ff_thread_finish_setup().
2921 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2923 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2930 typedef struct AVHWAccel {
2932 * Name of the hardware accelerated codec.
2933 * The name is globally unique among encoders and among decoders (but an
2934 * encoder and a decoder can share the same name).
2939 * Type of codec implemented by the hardware accelerator.
2941 * See AVMEDIA_TYPE_xxx
2943 enum AVMediaType type;
2946 * Codec implemented by the hardware accelerator.
2953 * Supported pixel format.
2955 * Only hardware accelerated formats are supported here.
2957 enum PixelFormat pix_fmt;
2960 * Hardware accelerated codec capabilities.
2961 * see FF_HWACCEL_CODEC_CAP_*
2965 struct AVHWAccel *next;
2968 * Called at the beginning of each frame or field picture.
2970 * Meaningful frame information (codec specific) is guaranteed to
2971 * be parsed at this point. This function is mandatory.
2973 * Note that buf can be NULL along with buf_size set to 0.
2974 * Otherwise, this means the whole frame is available at this point.
2976 * @param avctx the codec context
2977 * @param buf the frame data buffer base
2978 * @param buf_size the size of the frame in bytes
2979 * @return zero if successful, a negative value otherwise
2981 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2984 * Callback for each slice.
2986 * Meaningful slice information (codec specific) is guaranteed to
2987 * be parsed at this point. This function is mandatory.
2989 * @param avctx the codec context
2990 * @param buf the slice data buffer base
2991 * @param buf_size the size of the slice in bytes
2992 * @return zero if successful, a negative value otherwise
2994 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2997 * Called at the end of each frame or field picture.
2999 * The whole picture is parsed at this point and can now be sent
3000 * to the hardware accelerator. This function is mandatory.
3002 * @param avctx the codec context
3003 * @return zero if successful, a negative value otherwise
3005 int (*end_frame)(AVCodecContext *avctx);
3008 * Size of HW accelerator private data.
3010 * Private data is allocated with av_mallocz() before
3011 * AVCodecContext.get_buffer() and deallocated after
3012 * AVCodecContext.release_buffer().
3018 * four components are given, that's all.
3019 * the last component is alpha
3021 typedef struct AVPicture {
3023 int linesize[4]; ///< number of bytes per line
3026 #if FF_API_PALETTE_CONTROL
3029 * This structure defines a method for communicating palette changes
3030 * between and demuxer and a decoder.
3032 * @deprecated Use AVPacket to send palette changes instead.
3033 * This is totally broken.
3035 #define AVPALETTE_SIZE 1024
3036 #define AVPALETTE_COUNT 256
3037 typedef struct AVPaletteControl {
3039 /* Demuxer sets this to 1 to indicate the palette has changed;
3040 * decoder resets to 0. */
3041 int palette_changed;
3043 /* 4-byte ARGB palette entries, stored in native byte order; note that
3044 * the individual palette components should be on a 8-bit scale; if
3045 * the palette data comes from an IBM VGA native format, the component
3046 * data is probably 6 bits in size and needs to be scaled. */
3047 unsigned int palette[AVPALETTE_COUNT];
3049 } AVPaletteControl attribute_deprecated;
3052 enum AVSubtitleType {
3055 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3058 * Plain text, the text field must be set by the decoder and is
3059 * authoritative. ass and pict fields may contain approximations.
3064 * Formatted text, the ass field must be set by the decoder and is
3065 * authoritative. pict and text fields may contain approximations.
3070 typedef struct AVSubtitleRect {
3071 int x; ///< top left corner of pict, undefined when pict is not set
3072 int y; ///< top left corner of pict, undefined when pict is not set
3073 int w; ///< width of pict, undefined when pict is not set
3074 int h; ///< height of pict, undefined when pict is not set
3075 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3078 * data+linesize for the bitmap of this subtitle.
3079 * can be set for text/ass as well once they where rendered
3082 enum AVSubtitleType type;
3084 char *text; ///< 0 terminated plain UTF-8 text
3087 * 0 terminated ASS/SSA compatible event line.
3088 * The pressentation of this is unaffected by the other values in this
3094 typedef struct AVSubtitle {
3095 uint16_t format; /* 0 = graphics */
3096 uint32_t start_display_time; /* relative to packet pts, in ms */
3097 uint32_t end_display_time; /* relative to packet pts, in ms */
3099 AVSubtitleRect **rects;
3100 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3103 /* packet functions */
3106 * @deprecated use NULL instead
3108 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3111 * Default packet destructor.
3113 void av_destruct_packet(AVPacket *pkt);
3116 * Initialize optional fields of a packet with default values.
3120 void av_init_packet(AVPacket *pkt);
3123 * Allocate the payload of a packet and initialize its fields with
3127 * @param size wanted payload size
3128 * @return 0 if OK, AVERROR_xxx otherwise
3130 int av_new_packet(AVPacket *pkt, int size);
3133 * Reduce packet size, correctly zeroing padding
3136 * @param size new size
3138 void av_shrink_packet(AVPacket *pkt, int size);
3141 * Increase packet size, correctly zeroing padding
3144 * @param grow_by number of bytes by which to increase the size of the packet
3146 int av_grow_packet(AVPacket *pkt, int grow_by);
3149 * @warning This is a hack - the packet memory allocation stuff is broken. The
3150 * packet is allocated if it was not really allocated.
3152 int av_dup_packet(AVPacket *pkt);
3157 * @param pkt packet to free
3159 void av_free_packet(AVPacket *pkt);
3162 * Allocate new information of a packet.
3165 * @param type side information type
3166 * @param size side information size
3167 * @return pointer to fresh allocated data or NULL otherwise
3169 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3173 * Get side information from packet.
3176 * @param type desired side information type
3177 * @param size pointer for side information size to store (optional)
3178 * @return pointer to data if present or NULL otherwise
3180 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3185 struct ReSampleContext;
3186 struct AVResampleContext;
3188 typedef struct ReSampleContext ReSampleContext;
3191 * Initialize audio resampling context.
3193 * @param output_channels number of output channels
3194 * @param input_channels number of input channels
3195 * @param output_rate output sample rate
3196 * @param input_rate input sample rate
3197 * @param sample_fmt_out requested output sample format
3198 * @param sample_fmt_in input sample format
3199 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3200 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3201 * @param linear if 1 then the used FIR filter will be linearly interpolated
3202 between the 2 closest, if 0 the closest will be used
3203 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3204 * @return allocated ReSampleContext, NULL if error occured
3206 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3207 int output_rate, int input_rate,
3208 enum AVSampleFormat sample_fmt_out,
3209 enum AVSampleFormat sample_fmt_in,
3210 int filter_length, int log2_phase_count,
3211 int linear, double cutoff);
3213 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3216 * Free resample context.
3218 * @param s a non-NULL pointer to a resample context previously
3219 * created with av_audio_resample_init()
3221 void audio_resample_close(ReSampleContext *s);
3225 * Initialize an audio resampler.
3226 * Note, if either rate is not an integer then simply scale both rates up so they are.
3227 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3228 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3229 * @param linear If 1 then the used FIR filter will be linearly interpolated
3230 between the 2 closest, if 0 the closest will be used
3231 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3233 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3236 * Resample an array of samples using a previously configured context.
3237 * @param src an array of unconsumed samples
3238 * @param consumed the number of samples of src which have been consumed are returned here
3239 * @param src_size the number of unconsumed samples available
3240 * @param dst_size the amount of space in samples available in dst
3241 * @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.
3242 * @return the number of samples written in dst or -1 if an error occurred
3244 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3248 * Compensate samplerate/timestamp drift. The compensation is done by changing
3249 * the resampler parameters, so no audible clicks or similar distortions occur
3250 * @param compensation_distance distance in output samples over which the compensation should be performed
3251 * @param sample_delta number of output samples which should be output less
3253 * example: av_resample_compensate(c, 10, 500)
3254 * here instead of 510 samples only 500 samples would be output
3256 * note, due to rounding the actual compensation might be slightly different,
3257 * especially if the compensation_distance is large and the in_rate used during init is small
3259 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3260 void av_resample_close(struct AVResampleContext *c);
3263 * Allocate memory for a picture. Call avpicture_free to free it.
3265 * @param picture the picture to be filled in
3266 * @param pix_fmt the format of the picture
3267 * @param width the width of the picture
3268 * @param height the height of the picture
3269 * @return zero if successful, a negative value if not
3271 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3274 * Free a picture previously allocated by avpicture_alloc().
3276 * @param picture the AVPicture to be freed
3278 void avpicture_free(AVPicture *picture);
3281 * Fill in the AVPicture fields.
3282 * The fields of the given AVPicture are filled in by using the 'ptr' address
3283 * which points to the image data buffer. Depending on the specified picture
3284 * format, one or multiple image data pointers and line sizes will be set.
3285 * If a planar format is specified, several pointers will be set pointing to
3286 * the different picture planes and the line sizes of the different planes
3287 * will be stored in the lines_sizes array.
3288 * Call with ptr == NULL to get the required size for the ptr buffer.
3290 * @param picture AVPicture whose fields are to be filled in
3291 * @param ptr Buffer which will contain or contains the actual image data
3292 * @param pix_fmt The format in which the picture data is stored.
3293 * @param width the width of the image in pixels
3294 * @param height the height of the image in pixels
3295 * @return size of the image data in bytes
3297 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3298 enum PixelFormat pix_fmt, int width, int height);
3299 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3300 unsigned char *dest, int dest_size);
3303 * Calculate the size in bytes that a picture of the given width and height
3304 * would occupy if stored in the given picture format.
3305 * Note that this returns the size of a compact representation as generated
3306 * by avpicture_layout, which can be smaller than the size required for e.g.
3309 * @param pix_fmt the given picture format
3310 * @param width the width of the image
3311 * @param height the height of the image
3312 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3314 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3315 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3316 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3317 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3320 * Return a value representing the fourCC code associated to the
3321 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3324 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3327 * Put a string representing the codec tag codec_tag in buf.
3329 * @param buf_size size in bytes of buf
3330 * @return the length of the string that would have been generated if
3331 * enough space had been available, excluding the trailing null
3333 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3335 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3336 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3337 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3338 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3339 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3340 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3343 * Compute what kind of losses will occur when converting from one specific
3344 * pixel format to another.
3345 * When converting from one pixel format to another, information loss may occur.
3346 * For example, when converting from RGB24 to GRAY, the color information will
3347 * be lost. Similarly, other losses occur when converting from some formats to
3348 * other formats. These losses can involve loss of chroma, but also loss of
3349 * resolution, loss of color depth, loss due to the color space conversion, loss
3350 * of the alpha bits or loss due to color quantization.
3351 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3352 * which will occur when converting from one pixel format to another.
3354 * @param[in] dst_pix_fmt destination pixel format
3355 * @param[in] src_pix_fmt source pixel format
3356 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3357 * @return Combination of flags informing you what kind of losses will occur.
3359 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3363 * Find the best pixel format to convert to given a certain source pixel
3364 * format. When converting from one pixel format to another, information loss
3365 * may occur. For example, when converting from RGB24 to GRAY, the color
3366 * information will be lost. Similarly, other losses occur when converting from
3367 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3368 * the given pixel formats should be used to suffer the least amount of loss.
3369 * The pixel formats from which it chooses one, are determined by the
3370 * pix_fmt_mask parameter.
3373 * src_pix_fmt = PIX_FMT_YUV420P;
3374 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3375 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3378 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3379 * @param[in] src_pix_fmt source pixel format
3380 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3381 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3382 * @return The best pixel format to convert to or -1 if none was found.
3384 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3385 int has_alpha, int *loss_ptr);
3387 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3388 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3391 * Tell if an image really has transparent alpha values.
3392 * @return ored mask of FF_ALPHA_xxx constants
3394 int img_get_alpha_info(const AVPicture *src,
3395 enum PixelFormat pix_fmt, int width, int height);
3397 /* deinterlace a picture */
3398 /* deinterlace - if not supported return -1 */
3399 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3400 enum PixelFormat pix_fmt, int width, int height);
3402 /* external high level API */
3405 * If c is NULL, returns the first registered codec,
3406 * if c is non-NULL, returns the next registered codec after c,
3407 * or NULL if c is the last one.
3409 AVCodec *av_codec_next(AVCodec *c);
3412 * Return the LIBAVCODEC_VERSION_INT constant.
3414 unsigned avcodec_version(void);
3417 * Return the libavcodec build-time configuration.
3419 const char *avcodec_configuration(void);
3422 * Return the libavcodec license.
3424 const char *avcodec_license(void);
3427 * Initialize libavcodec.
3429 * @warning This function must be called before any other libavcodec
3432 void avcodec_init(void);
3435 * Register the codec codec and initialize libavcodec.
3437 * @see avcodec_init()
3439 void avcodec_register(AVCodec *codec);
3442 * Find a registered encoder with a matching codec ID.
3444 * @param id CodecID of the requested encoder
3445 * @return An encoder if one was found, NULL otherwise.
3447 AVCodec *avcodec_find_encoder(enum CodecID id);
3450 * Find a registered encoder with the specified name.
3452 * @param name name of the requested encoder
3453 * @return An encoder if one was found, NULL otherwise.
3455 AVCodec *avcodec_find_encoder_by_name(const char *name);
3458 * Find a registered decoder with a matching codec ID.
3460 * @param id CodecID of the requested decoder
3461 * @return A decoder if one was found, NULL otherwise.
3463 AVCodec *avcodec_find_decoder(enum CodecID id);
3466 * Find a registered decoder with the specified name.
3468 * @param name name of the requested decoder
3469 * @return A decoder if one was found, NULL otherwise.
3471 AVCodec *avcodec_find_decoder_by_name(const char *name);
3472 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3475 * Return a name for the specified profile, if available.
3477 * @param codec the codec that is searched for the given profile
3478 * @param profile the profile value for which a name is requested
3479 * @return A name for the profile if found, NULL otherwise.
3481 const char *av_get_profile_name(const AVCodec *codec, int profile);
3484 * Set the fields of the given AVCodecContext to default values.
3486 * @param s The AVCodecContext of which the fields should be set to default values.
3488 void avcodec_get_context_defaults(AVCodecContext *s);
3490 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3491 * we WILL change its arguments and name a few times! */
3492 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3494 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3495 * we WILL change its arguments and name a few times! */
3496 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3499 * Allocate an AVCodecContext and set its fields to default values. The
3500 * resulting struct can be deallocated by simply calling av_free().
3502 * @return An AVCodecContext filled with default values or NULL on failure.
3503 * @see avcodec_get_context_defaults
3505 AVCodecContext *avcodec_alloc_context(void);
3507 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3508 * we WILL change its arguments and name a few times! */
3509 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3511 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3512 * we WILL change its arguments and name a few times! */
3513 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3516 * Copy the settings of the source AVCodecContext into the destination
3517 * AVCodecContext. The resulting destination codec context will be
3518 * unopened, i.e. you are required to call avcodec_open() before you
3519 * can use this AVCodecContext to decode/encode video/audio data.
3521 * @param dest target codec context, should be initialized with
3522 * avcodec_alloc_context(), but otherwise uninitialized
3523 * @param src source codec context
3524 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3526 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3529 * Set the fields of the given AVFrame to default values.
3531 * @param pic The AVFrame of which the fields should be set to default values.
3533 void avcodec_get_frame_defaults(AVFrame *pic);
3536 * Allocate an AVFrame and set its fields to default values. The resulting
3537 * struct can be deallocated by simply calling av_free().
3539 * @return An AVFrame filled with default values or NULL on failure.
3540 * @see avcodec_get_frame_defaults
3542 AVFrame *avcodec_alloc_frame(void);
3544 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3545 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3546 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3549 * Return the amount of padding in pixels which the get_buffer callback must
3550 * provide around the edge of the image for codecs which do not have the
3551 * CODEC_FLAG_EMU_EDGE flag.
3553 * @return Required padding in pixels.
3555 unsigned avcodec_get_edge_width(void);
3557 * Modify width and height values so that they will result in a memory
3558 * buffer that is acceptable for the codec if you do not use any horizontal
3561 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3562 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3563 * according to avcodec_get_edge_width() before.
3565 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3567 * Modify width and height values so that they will result in a memory
3568 * buffer that is acceptable for the codec if you also ensure that all
3569 * line sizes are a multiple of the respective linesize_align[i].
3571 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3572 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3573 * according to avcodec_get_edge_width() before.
3575 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3576 int linesize_align[4]);
3578 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3580 #if FF_API_THREAD_INIT
3582 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3584 attribute_deprecated
3585 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3588 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3589 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3590 //FIXME func typedef
3593 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3594 * function the context has to be allocated.
3596 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3597 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3598 * retrieving a codec.
3600 * @warning This function is not thread safe!
3603 * avcodec_register_all();
3604 * codec = avcodec_find_decoder(CODEC_ID_H264);
3608 * context = avcodec_alloc_context();
3610 * if (avcodec_open(context, codec) < 0)
3614 * @param avctx The context which will be set up to use the given codec.
3615 * @param codec The codec to use within the context.
3616 * @return zero on success, a negative value on error
3617 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3619 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3622 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3623 * Some decoders may support multiple frames in a single AVPacket, such
3624 * decoders would then just decode the first frame. In this case,
3625 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3626 * the remaining data in order to decode the second frame etc.
3628 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3629 * decompressed frame size in bytes.
3631 * @warning You must set frame_size_ptr to the allocated size of the
3632 * output buffer before calling avcodec_decode_audio3().
3634 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3635 * the actual read bytes because some optimized bitstream readers read 32 or 64
3636 * bits at once and could read over the end.
3638 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3639 * no overreading happens for damaged MPEG streams.
3641 * @note You might have to align the input buffer avpkt->data and output buffer
3642 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3643 * necessary at all, on others it won't work at all if not aligned and on others
3644 * it will work but it will have an impact on performance.
3646 * In practice, avpkt->data should have 4 byte alignment at minimum and
3647 * samples should be 16 byte aligned unless the CPU doesn't need it
3648 * (AltiVec and SSE do).
3650 * @param avctx the codec context
3651 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3652 * @param[in,out] frame_size_ptr the output buffer size in bytes
3653 * @param[in] avpkt The input AVPacket containing the input buffer.
3654 * You can create such packet with av_init_packet() and by then setting
3655 * data and size, some decoders might in addition need other fields.
3656 * All decoders are designed to use the least fields possible though.
3657 * @return On error a negative value is returned, otherwise the number of bytes
3658 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3660 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3661 int *frame_size_ptr,
3665 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3666 * Some decoders may support multiple frames in a single AVPacket, such
3667 * decoders would then just decode the first frame.
3669 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3670 * the actual read bytes because some optimized bitstream readers read 32 or 64
3671 * bits at once and could read over the end.
3673 * @warning The end of the input buffer buf should be set to 0 to ensure that
3674 * no overreading happens for damaged MPEG streams.
3676 * @note You might have to align the input buffer avpkt->data.
3677 * The alignment requirements depend on the CPU: on some CPUs it isn't
3678 * necessary at all, on others it won't work at all if not aligned and on others
3679 * it will work but it will have an impact on performance.
3681 * In practice, avpkt->data should have 4 byte alignment at minimum.
3683 * @note Some codecs have a delay between input and output, these need to be
3684 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3686 * @param avctx the codec context
3687 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3688 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3689 * allocate memory for the actual bitmap.
3690 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3691 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3692 * decodes and the decoder tells the user once it does not need the data anymore,
3693 * the user app can at this point free/reuse/keep the memory as it sees fit.
3695 * @param[in] avpkt The input AVpacket containing the input buffer.
3696 * You can create such packet with av_init_packet() and by then setting
3697 * data and size, some decoders might in addition need other fields like
3698 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3700 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3701 * @return On error a negative value is returned, otherwise the number of bytes
3702 * used or zero if no frame could be decompressed.
3704 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3705 int *got_picture_ptr,
3709 * Decode a subtitle message.
3710 * Return a negative value on error, otherwise return the number of bytes used.
3711 * If no subtitle could be decompressed, got_sub_ptr is zero.
3712 * Otherwise, the subtitle is stored in *sub.
3713 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3714 * simplicity, because the performance difference is expect to be negligible
3715 * and reusing a get_buffer written for video codecs would probably perform badly
3716 * due to a potentially very different allocation pattern.
3718 * @param avctx the codec context
3719 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3720 freed with avsubtitle_free if *got_sub_ptr is set.
3721 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3722 * @param[in] avpkt The input AVPacket containing the input buffer.
3724 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3729 * Frees all allocated data in the given subtitle struct.
3731 * @param sub AVSubtitle to free.
3733 void avsubtitle_free(AVSubtitle *sub);
3735 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3737 uint8_t *buf, int buf_size);
3740 * Encode an audio frame from samples into buf.
3742 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3743 * However, for PCM audio the user will know how much space is needed
3744 * because it depends on the value passed in buf_size as described
3745 * below. In that case a lower value can be used.
3747 * @param avctx the codec context
3748 * @param[out] buf the output buffer
3749 * @param[in] buf_size the output buffer size
3750 * @param[in] samples the input buffer containing the samples
3751 * The number of samples read from this buffer is frame_size*channels,
3752 * both of which are defined in avctx.
3753 * For PCM audio the number of samples read from samples is equal to
3754 * buf_size * input_sample_size / output_sample_size.
3755 * @return On error a negative value is returned, on success zero or the number
3756 * of bytes used to encode the data read from the input buffer.
3758 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3759 const short *samples);
3762 * Encode a video frame from pict into buf.
3763 * The input picture should be
3764 * stored using a specific format, namely avctx.pix_fmt.
3766 * @param avctx the codec context
3767 * @param[out] buf the output buffer for the bitstream of encoded frame
3768 * @param[in] buf_size the size of the output buffer in bytes
3769 * @param[in] pict the input picture to encode
3770 * @return On error a negative value is returned, on success zero or the number
3771 * of bytes used from the output buffer.
3773 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3774 const AVFrame *pict);
3775 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3776 const AVSubtitle *sub);
3778 int avcodec_close(AVCodecContext *avctx);
3781 * Register all the codecs, parsers and bitstream filters which were enabled at
3782 * configuration time. If you do not call this function you can select exactly
3783 * which formats you want to support, by using the individual registration
3786 * @see avcodec_register
3787 * @see av_register_codec_parser
3788 * @see av_register_bitstream_filter
3790 void avcodec_register_all(void);
3793 * Flush buffers, should be called when seeking or when switching to a different stream.
3795 void avcodec_flush_buffers(AVCodecContext *avctx);
3797 void avcodec_default_free_buffers(AVCodecContext *s);
3799 /* misc useful functions */
3802 * Return a single letter to describe the given picture type pict_type.
3804 * @param[in] pict_type the picture type
3805 * @return A single character representing the picture type.
3807 char av_get_pict_type_char(int pict_type);
3810 * Return codec bits per sample.
3812 * @param[in] codec_id the codec
3813 * @return Number of bits per sample or zero if unknown for the given codec.
3815 int av_get_bits_per_sample(enum CodecID codec_id);
3817 #if FF_API_OLD_SAMPLE_FMT
3819 * @deprecated Use av_get_bits_per_sample_fmt() instead.
3821 attribute_deprecated
3822 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
3826 typedef struct AVCodecParserContext {
3828 struct AVCodecParser *parser;
3829 int64_t frame_offset; /* offset of the current frame */
3830 int64_t cur_offset; /* current offset
3831 (incremented by each av_parser_parse()) */
3832 int64_t next_frame_offset; /* offset of the next frame */
3834 int pict_type; /* XXX: Put it back in AVCodecContext. */
3836 * This field is used for proper frame duration computation in lavf.
3837 * It signals, how much longer the frame duration of the current frame
3838 * is compared to normal frame duration.
3840 * frame_duration = (1 + repeat_pict) * time_base
3842 * It is used by codecs like H.264 to display telecined material.
3844 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3845 int64_t pts; /* pts of the current frame */
3846 int64_t dts; /* dts of the current frame */
3851 int fetch_timestamp;
3853 #define AV_PARSER_PTS_NB 4
3854 int cur_frame_start_index;
3855 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3856 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3857 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3860 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3861 #define PARSER_FLAG_ONCE 0x0002
3862 /// Set if the parser has a valid file offset
3863 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3865 int64_t offset; ///< byte offset from starting packet start
3866 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3869 * Set by parser to 1 for key frames and 0 for non-key frames.
3870 * It is initialized to -1, so if the parser doesn't set this flag,
3871 * old-style fallback using FF_I_TYPE picture type as key frames
3877 * Time difference in stream time base units from the pts of this
3878 * packet to the point at which the output from the decoder has converged
3879 * independent from the availability of previous frames. That is, the
3880 * frames are virtually identical no matter if decoding started from
3881 * the very first frame or from this keyframe.
3882 * Is AV_NOPTS_VALUE if unknown.
3883 * This field is not the display duration of the current frame.
3884 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3887 * The purpose of this field is to allow seeking in streams that have no
3888 * keyframes in the conventional sense. It corresponds to the
3889 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3890 * essential for some types of subtitle streams to ensure that all
3891 * subtitles are correctly displayed after seeking.
3893 int64_t convergence_duration;
3895 // Timestamp generation support:
3897 * Synchronization point for start of timestamp generation.
3899 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3902 * For example, this corresponds to presence of H.264 buffering period
3908 * Offset of the current timestamp against last timestamp sync point in
3909 * units of AVCodecContext.time_base.
3911 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3912 * contain a valid timestamp offset.
3914 * Note that the timestamp of sync point has usually a nonzero
3915 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3916 * the next frame after timestamp sync point will be usually 1.
3918 * For example, this corresponds to H.264 cpb_removal_delay.
3920 int dts_ref_dts_delta;
3923 * Presentation delay of current frame in units of AVCodecContext.time_base.
3925 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3926 * contain valid non-negative timestamp delta (presentation time of a frame
3927 * must not lie in the past).
3929 * This delay represents the difference between decoding and presentation
3930 * time of the frame.
3932 * For example, this corresponds to H.264 dpb_output_delay.
3937 * Position of the packet in file.
3939 * Analogous to cur_frame_pts/dts
3941 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3944 * Byte position of currently parsed frame in stream.
3949 * Previous frame byte position.
3952 } AVCodecParserContext;
3954 typedef struct AVCodecParser {
3955 int codec_ids[5]; /* several codec IDs are permitted */
3957 int (*parser_init)(AVCodecParserContext *s);
3958 int (*parser_parse)(AVCodecParserContext *s,
3959 AVCodecContext *avctx,
3960 const uint8_t **poutbuf, int *poutbuf_size,
3961 const uint8_t *buf, int buf_size);
3962 void (*parser_close)(AVCodecParserContext *s);
3963 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3964 struct AVCodecParser *next;
3967 AVCodecParser *av_parser_next(AVCodecParser *c);
3969 void av_register_codec_parser(AVCodecParser *parser);
3970 AVCodecParserContext *av_parser_init(int codec_id);
3975 * @param s parser context.
3976 * @param avctx codec context.
3977 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3978 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3979 * @param buf input buffer.
3980 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3981 * @param pts input presentation timestamp.
3982 * @param dts input decoding timestamp.
3983 * @param pos input byte position in stream.
3984 * @return the number of bytes of the input bitstream used.
3989 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3996 * decode_frame(data, size);
4000 int av_parser_parse2(AVCodecParserContext *s,
4001 AVCodecContext *avctx,
4002 uint8_t **poutbuf, int *poutbuf_size,
4003 const uint8_t *buf, int buf_size,
4004 int64_t pts, int64_t dts,
4007 int av_parser_change(AVCodecParserContext *s,
4008 AVCodecContext *avctx,
4009 uint8_t **poutbuf, int *poutbuf_size,
4010 const uint8_t *buf, int buf_size, int keyframe);
4011 void av_parser_close(AVCodecParserContext *s);
4014 typedef struct AVBitStreamFilterContext {
4016 struct AVBitStreamFilter *filter;
4017 AVCodecParserContext *parser;
4018 struct AVBitStreamFilterContext *next;
4019 } AVBitStreamFilterContext;
4022 typedef struct AVBitStreamFilter {
4025 int (*filter)(AVBitStreamFilterContext *bsfc,
4026 AVCodecContext *avctx, const char *args,
4027 uint8_t **poutbuf, int *poutbuf_size,
4028 const uint8_t *buf, int buf_size, int keyframe);
4029 void (*close)(AVBitStreamFilterContext *bsfc);
4030 struct AVBitStreamFilter *next;
4031 } AVBitStreamFilter;
4033 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4034 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4035 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4036 AVCodecContext *avctx, const char *args,
4037 uint8_t **poutbuf, int *poutbuf_size,
4038 const uint8_t *buf, int buf_size, int keyframe);
4039 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4041 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4046 * Reallocate the given block if it is not large enough, otherwise do nothing.
4050 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4053 * Allocate a buffer, reusing the given one if large enough.
4055 * Contrary to av_fast_realloc the current buffer contents might not be
4056 * preserved and on error the old buffer is freed, thus no special
4057 * handling to avoid memleaks is necessary.
4059 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4060 * @param size size of the buffer *ptr points to
4061 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4062 * *size 0 if an error occurred.
4064 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4067 * Copy image src to dst. Wraps av_picture_data_copy() above.
4069 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4070 enum PixelFormat pix_fmt, int width, int height);
4073 * Crop image top and left side.
4075 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4076 enum PixelFormat pix_fmt, int top_band, int left_band);
4081 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4082 int padtop, int padbottom, int padleft, int padright, int *color);
4085 * Encode extradata length to a buffer. Used by xiph codecs.
4087 * @param s buffer to write to; must be at least (v/255+1) bytes long
4088 * @param v size of extradata in bytes
4089 * @return number of bytes written to the buffer.
4091 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4094 * Logs a generic warning message about a missing feature. This function is
4095 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4096 * only, and would normally not be used by applications.
4097 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4098 * a pointer to an AVClass struct
4099 * @param[in] feature string containing the name of the missing feature
4100 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4101 * If want_sample is non-zero, additional verbage will be added to the log
4102 * message which tells the user how to report samples to the development
4105 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4108 * Log a generic warning message asking for a sample. This function is
4109 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4110 * only, and would normally not be used by applications.
4111 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4112 * a pointer to an AVClass struct
4113 * @param[in] msg string containing an optional message, or NULL if no message
4115 void av_log_ask_for_sample(void *avc, const char *msg);
4118 * Register the hardware accelerator hwaccel.
4120 void av_register_hwaccel(AVHWAccel *hwaccel);
4123 * If hwaccel is NULL, returns the first registered hardware accelerator,
4124 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4125 * after hwaccel, or NULL if hwaccel is the last one.
4127 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4131 * Lock operation used by lockmgr
4134 AV_LOCK_CREATE, ///< Create a mutex
4135 AV_LOCK_OBTAIN, ///< Lock the mutex
4136 AV_LOCK_RELEASE, ///< Unlock the mutex
4137 AV_LOCK_DESTROY, ///< Free mutex resources
4141 * Register a user provided lock manager supporting the operations
4142 * specified by AVLockOp. mutex points to a (void *) where the
4143 * lockmgr should store/get a pointer to a user allocated mutex. It's
4144 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4146 * @param cb User defined callback. Note: Libav may invoke calls to this
4147 * callback during the call to av_lockmgr_register().
4148 * Thus, the application must be prepared to handle that.
4149 * If cb is set to NULL the lockmgr will be unregistered.
4150 * Also note that during unregistration the previously registered
4151 * lockmgr callback may also be invoked.
4153 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4155 #endif /* AVCODEC_AVCODEC_H */