2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
25 * @file libavcodec/avcodec.h
30 #include "libavutil/avutil.h"
32 #define LIBAVCODEC_VERSION_MAJOR 52
33 #define LIBAVCODEC_VERSION_MINOR 23
34 #define LIBAVCODEC_VERSION_MICRO 0
36 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
37 LIBAVCODEC_VERSION_MINOR, \
38 LIBAVCODEC_VERSION_MICRO)
39 #define LIBAVCODEC_VERSION AV_VERSION(LIBAVCODEC_VERSION_MAJOR, \
40 LIBAVCODEC_VERSION_MINOR, \
41 LIBAVCODEC_VERSION_MICRO)
42 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
44 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
46 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
47 #define AV_TIME_BASE 1000000
48 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
51 * Identifies the syntax and semantics of the bitstream.
52 * The principle is roughly:
53 * Two decoders with the same ID can decode the same streams.
54 * Two encoders with the same ID can encode compatible streams.
55 * There may be slight deviations from the principle due to implementation
58 * If you add a codec ID to this list, add it so that
59 * 1. no value of a existing codec ID changes (that would break ABI),
60 * 2. it is as close as possible to similar codecs.
67 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
68 CODEC_ID_MPEG2VIDEO_XVMC,
105 CODEC_ID_INTERPLAY_VIDEO,
117 CODEC_ID_TRUEMOTION1,
145 CODEC_ID_TRUEMOTION2,
162 CODEC_ID_DSICINVIDEO,
163 CODEC_ID_TIERTEXSEQVIDEO,
172 CODEC_ID_BETHSOFTVID,
190 CODEC_ID_MOTIONPIXELS,
197 /* various PCM "codecs" */
198 CODEC_ID_PCM_S16LE= 0x10000,
214 CODEC_ID_PCM_S24DAUD,
216 CODEC_ID_PCM_S16LE_PLANAR,
223 /* various ADPCM codecs */
224 CODEC_ID_ADPCM_IMA_QT= 0x11000,
225 CODEC_ID_ADPCM_IMA_WAV,
226 CODEC_ID_ADPCM_IMA_DK3,
227 CODEC_ID_ADPCM_IMA_DK4,
228 CODEC_ID_ADPCM_IMA_WS,
229 CODEC_ID_ADPCM_IMA_SMJPEG,
238 CODEC_ID_ADPCM_YAMAHA,
239 CODEC_ID_ADPCM_SBPRO_4,
240 CODEC_ID_ADPCM_SBPRO_3,
241 CODEC_ID_ADPCM_SBPRO_2,
243 CODEC_ID_ADPCM_IMA_AMV,
244 CODEC_ID_ADPCM_EA_R1,
245 CODEC_ID_ADPCM_EA_R3,
246 CODEC_ID_ADPCM_EA_R2,
247 CODEC_ID_ADPCM_IMA_EA_SEAD,
248 CODEC_ID_ADPCM_IMA_EA_EACS,
249 CODEC_ID_ADPCM_EA_XAS,
250 CODEC_ID_ADPCM_EA_MAXIS_XA,
251 CODEC_ID_ADPCM_IMA_ISS,
254 CODEC_ID_AMR_NB= 0x12000,
257 /* RealAudio codecs*/
258 CODEC_ID_RA_144= 0x13000,
261 /* various DPCM codecs */
262 CODEC_ID_ROQ_DPCM= 0x14000,
263 CODEC_ID_INTERPLAY_DPCM,
268 CODEC_ID_MP2= 0x15000,
269 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
287 CODEC_ID_WESTWOOD_SND1,
288 CODEC_ID_GSM, ///< as in Berlin toast format
296 CODEC_ID_DSICINAUDIO,
300 CODEC_ID_GSM_MS, /* as found in WAV */
309 CODEC_ID_WMALOSSLESS,
317 /* subtitle codecs */
318 CODEC_ID_DVD_SUBTITLE= 0x17000,
319 CODEC_ID_DVB_SUBTITLE,
320 CODEC_ID_TEXT, ///< raw UTF-8 text
325 /* other specific kind of codecs (generally used for attachments) */
326 CODEC_ID_TTF= 0x18000,
328 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
330 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
331 * stream (only used by libavformat) */
335 CODEC_TYPE_UNKNOWN = -1,
340 CODEC_TYPE_ATTACHMENT,
345 * all in native-endian format
348 SAMPLE_FMT_NONE = -1,
349 SAMPLE_FMT_U8, ///< unsigned 8 bits
350 SAMPLE_FMT_S16, ///< signed 16 bits
351 SAMPLE_FMT_S32, ///< signed 32 bits
352 SAMPLE_FMT_FLT, ///< float
353 SAMPLE_FMT_DBL, ///< double
354 SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
357 /* Audio channel masks */
358 #define CH_FRONT_LEFT 0x00000001
359 #define CH_FRONT_RIGHT 0x00000002
360 #define CH_FRONT_CENTER 0x00000004
361 #define CH_LOW_FREQUENCY 0x00000008
362 #define CH_BACK_LEFT 0x00000010
363 #define CH_BACK_RIGHT 0x00000020
364 #define CH_FRONT_LEFT_OF_CENTER 0x00000040
365 #define CH_FRONT_RIGHT_OF_CENTER 0x00000080
366 #define CH_BACK_CENTER 0x00000100
367 #define CH_SIDE_LEFT 0x00000200
368 #define CH_SIDE_RIGHT 0x00000400
369 #define CH_TOP_CENTER 0x00000800
370 #define CH_TOP_FRONT_LEFT 0x00001000
371 #define CH_TOP_FRONT_CENTER 0x00002000
372 #define CH_TOP_FRONT_RIGHT 0x00004000
373 #define CH_TOP_BACK_LEFT 0x00008000
374 #define CH_TOP_BACK_CENTER 0x00010000
375 #define CH_TOP_BACK_RIGHT 0x00020000
376 #define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
377 #define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
379 /* Audio channel convenience macros */
380 #define CH_LAYOUT_MONO (CH_FRONT_CENTER)
381 #define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
382 #define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
383 #define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
384 #define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
385 #define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
386 #define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
387 #define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_SURROUND|CH_LOW_FREQUENCY|\
388 CH_BACK_LEFT|CH_BACK_RIGHT|\
389 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
390 #define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
393 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
396 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
397 * This is mainly needed because some optimized bitstream readers read
398 * 32 or 64 bit at once and could read over the end.<br>
399 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
400 * MPEG bitstreams could cause overread and segfault.
402 #define FF_INPUT_BUFFER_PADDING_SIZE 8
405 * minimum encoding buffer size
406 * Used to avoid some checks during header writing.
408 #define FF_MIN_BUFFER_SIZE 16384
412 * motion estimation type.
415 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
419 ME_EPZS, ///< enhanced predictive zonal search
420 ME_X1, ///< reserved for experiments
421 ME_HEX, ///< hexagon based search
422 ME_UMH, ///< uneven multi-hexagon search
423 ME_ITER, ///< iterative search
424 ME_TESA, ///< transformed exhaustive search algorithm
428 /* We leave some space between them for extensions (drop some
429 * keyframes for intra-only or drop just some bidir frames). */
430 AVDISCARD_NONE =-16, ///< discard nothing
431 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
432 AVDISCARD_NONREF = 8, ///< discard all non reference
433 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
434 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
435 AVDISCARD_ALL = 48, ///< discard all
438 typedef struct RcOverride{
441 int qscale; // If this is 0 then quality_factor will be used instead.
442 float quality_factor;
445 #define FF_MAX_B_FRAMES 16
448 These flags can be passed in AVCodecContext.flags before initialization.
449 Note: Not everything is supported yet.
452 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
453 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
454 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
455 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
456 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
457 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
459 * The parent program guarantees that the input for B-frames containing
460 * streams is not written to for at least s->max_b_frames+1 frames, if
461 * this is not set the input will be copied.
463 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
464 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
465 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
466 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
467 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
468 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
469 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
470 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
471 location instead of only at frame boundaries. */
472 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
473 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
474 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
475 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
476 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
477 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
478 /* Fx : Flag for h263+ extra options */
479 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
480 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
481 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
482 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
483 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
484 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
485 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
486 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
487 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
488 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
489 #define CODEC_FLAG_CLOSED_GOP 0x80000000
490 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
491 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
492 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
493 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
494 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
495 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
496 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
497 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
498 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
499 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
500 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
501 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
502 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
503 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
504 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
505 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
506 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
507 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
509 /* Unsupported options :
510 * Syntax Arithmetic coding (SAC)
511 * Reference Picture Selection
512 * Independent Segment Decoding */
514 /* codec capabilities */
516 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
518 * Codec uses get_buffer() for allocating buffers.
519 * direct rendering method 1
521 #define CODEC_CAP_DR1 0x0002
522 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
523 #define CODEC_CAP_PARSE_ONLY 0x0004
524 #define CODEC_CAP_TRUNCATED 0x0008
525 /* Codec can export data for HW decoding (XvMC). */
526 #define CODEC_CAP_HWACCEL 0x0010
528 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
529 * If this is not set, the codec is guaranteed to never be fed with NULL data.
531 #define CODEC_CAP_DELAY 0x0020
533 * Codec can be fed a final frame with a smaller size.
534 * This can be used to prevent truncation of the last audio samples.
536 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
538 * Codec can export data for HW decoding (VDPAU).
540 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
542 //The following defines may change, don't expect compatibility if you use them.
543 #define MB_TYPE_INTRA4x4 0x0001
544 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
545 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
546 #define MB_TYPE_16x16 0x0008
547 #define MB_TYPE_16x8 0x0010
548 #define MB_TYPE_8x16 0x0020
549 #define MB_TYPE_8x8 0x0040
550 #define MB_TYPE_INTERLACED 0x0080
551 #define MB_TYPE_DIRECT2 0x0100 //FIXME
552 #define MB_TYPE_ACPRED 0x0200
553 #define MB_TYPE_GMC 0x0400
554 #define MB_TYPE_SKIP 0x0800
555 #define MB_TYPE_P0L0 0x1000
556 #define MB_TYPE_P1L0 0x2000
557 #define MB_TYPE_P0L1 0x4000
558 #define MB_TYPE_P1L1 0x8000
559 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
560 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
561 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
562 #define MB_TYPE_QUANT 0x00010000
563 #define MB_TYPE_CBP 0x00020000
564 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
568 * This specifies the area which should be displayed.
569 * Note there may be multiple such areas for one frame.
571 typedef struct AVPanScan{
574 * - encoding: Set by user.
575 * - decoding: Set by libavcodec.
580 * width and height in 1/16 pel
581 * - encoding: Set by user.
582 * - decoding: Set by libavcodec.
588 * position of the top left corner in 1/16 pel for up to 3 fields/frames
589 * - encoding: Set by user.
590 * - decoding: Set by libavcodec.
592 int16_t position[3][2];
595 #define FF_COMMON_FRAME \
597 * pointer to the picture planes.\
598 * This might be different from the first allocated byte\
605 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
606 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
612 * 1 -> keyframe, 0-> not\
613 * - encoding: Set by libavcodec.\
614 * - decoding: Set by libavcodec.\
619 * Picture type of the frame, see ?_TYPE below.\
620 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
621 * - decoding: Set by libavcodec.\
626 * presentation timestamp in time_base units (time when frame should be shown to user)\
627 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
628 * - encoding: MUST be set by user.\
629 * - decoding: Set by libavcodec.\
634 * picture number in bitstream order\
635 * - encoding: set by\
636 * - decoding: Set by libavcodec.\
638 int coded_picture_number;\
640 * picture number in display order\
641 * - encoding: set by\
642 * - decoding: Set by libavcodec.\
644 int display_picture_number;\
647 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
648 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
649 * - decoding: Set by libavcodec.\
654 * buffer age (1->was last buffer and dint change, 2->..., ...).\
655 * Set to INT_MAX if the buffer has not been used yet.\
656 * - encoding: unused\
657 * - decoding: MUST be set by get_buffer().\
662 * is this picture used as reference\
663 * The values for this are the same as the MpegEncContext.picture_structure\
664 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
665 * Set to 4 for delayed, non-reference frames.\
666 * - encoding: unused\
667 * - decoding: Set by libavcodec. (before get_buffer() call)).\
673 * - encoding: unused\
674 * - decoding: Set by libavcodec.\
676 int8_t *qscale_table;\
679 * - encoding: unused\
680 * - decoding: Set by libavcodec.\
685 * mbskip_table[mb]>=1 if MB didn't change\
686 * stride= mb_width = (width+15)>>4\
687 * - encoding: unused\
688 * - decoding: Set by libavcodec.\
690 uint8_t *mbskip_table;\
693 * motion vector table\
696 * int mv_sample_log2= 4 - motion_subsample_log2;\
697 * int mb_width= (width+15)>>4;\
698 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
699 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
701 * - encoding: Set by user.\
702 * - decoding: Set by libavcodec.\
704 int16_t (*motion_val[2])[2];\
707 * macroblock type table\
708 * mb_type_base + mb_width + 2\
709 * - encoding: Set by user.\
710 * - decoding: Set by libavcodec.\
715 * log2 of the size of the block which a single vector in motion_val represents: \
716 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
717 * - encoding: unused\
718 * - decoding: Set by libavcodec.\
720 uint8_t motion_subsample_log2;\
723 * for some private data of the user\
724 * - encoding: unused\
725 * - decoding: Set by user.\
731 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
732 * - decoding: unused\
737 * type of the buffer (to keep track of who has to deallocate data[*])\
738 * - encoding: Set by the one who allocates it.\
739 * - decoding: Set by the one who allocates it.\
740 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
745 * When decoding, this signals how much the picture must be delayed.\
746 * extra_delay = repeat_pict / (2*fps)\
747 * - encoding: unused\
748 * - decoding: Set by libavcodec.\
758 * The content of the picture is interlaced.\
759 * - encoding: Set by user.\
760 * - decoding: Set by libavcodec. (default 0)\
762 int interlaced_frame;\
765 * If the content is interlaced, is top field displayed first.\
766 * - encoding: Set by user.\
767 * - decoding: Set by libavcodec.\
769 int top_field_first;\
773 * - encoding: Set by user.\
774 * - decoding: Set by libavcodec.\
776 AVPanScan *pan_scan;\
779 * Tell user application that palette has changed from previous frame.\
780 * - encoding: ??? (no palette-enabled encoder yet)\
781 * - decoding: Set by libavcodec. (default 0).\
783 int palette_has_changed;\
786 * codec suggestion on buffer type if != 0\
787 * - encoding: unused\
788 * - decoding: Set by libavcodec. (before get_buffer() call)).\
794 * - encoding: unused\
795 * - decoding: Set by libavcodec.\
800 * motion referece frame index\
801 * - encoding: Set by user.\
802 * - decoding: Set by libavcodec.\
804 int8_t *ref_index[2];\
807 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
808 * output in AVFrame.reordered_opaque\
809 * - encoding: unused\
810 * - decoding: Read by user.\
812 int64_t reordered_opaque;\
815 * hardware accelerator private data (FFmpeg allocated)\
816 * - encoding: unused\
817 * - decoding: Set by libavcodec\
819 void *hwaccel_picture_private;\
822 #define FF_QSCALE_TYPE_MPEG1 0
823 #define FF_QSCALE_TYPE_MPEG2 1
824 #define FF_QSCALE_TYPE_H264 2
826 #define FF_BUFFER_TYPE_INTERNAL 1
827 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
828 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
829 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
832 #define FF_I_TYPE 1 ///< Intra
833 #define FF_P_TYPE 2 ///< Predicted
834 #define FF_B_TYPE 3 ///< Bi-dir predicted
835 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
836 #define FF_SI_TYPE 5 ///< Switching Intra
837 #define FF_SP_TYPE 6 ///< Switching Predicted
840 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
841 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
842 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
843 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
847 * New fields can be added to the end of FF_COMMON_FRAME with minor version
849 * Removal, reordering and changes to existing fields require a major
850 * version bump. No fields should be added into AVFrame before or after
852 * sizeof(AVFrame) must not be used outside libav*.
854 typedef struct AVFrame {
859 * main external API structure.
860 * New fields can be added to the end with minor version bumps.
861 * Removal, reordering and changes to existing fields require a major
863 * sizeof(AVCodecContext) must not be used outside libav*.
865 typedef struct AVCodecContext {
867 * information on struct for av_log
868 * - set by avcodec_alloc_context
870 const AVClass *av_class;
872 * the average bitrate
873 * - encoding: Set by user; unused for constant quantizer encoding.
874 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
879 * number of bits the bitstream is allowed to diverge from the reference.
880 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
881 * - encoding: Set by user; unused for constant quantizer encoding.
884 int bit_rate_tolerance;
888 * - encoding: Set by user.
889 * - decoding: Set by user.
894 * Some codecs need additional format info. It is stored here.
895 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
896 * specific codec MUST set it correctly otherwise stream copy breaks.
897 * In general use of this field by muxers is not recommanded.
898 * - encoding: Set by libavcodec.
899 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
904 * Motion estimation algorithm used for video coding.
905 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
906 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
907 * - encoding: MUST be set by user.
913 * some codecs need / can use extradata like Huffman tables.
914 * mjpeg: Huffman tables
915 * rv10: additional flags
916 * mpeg4: global headers (they can be in the bitstream or here)
917 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
918 * than extradata_size to avoid prolems if it is read with the bitstream reader.
919 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
920 * - encoding: Set/allocated/freed by libavcodec.
921 * - decoding: Set/allocated/freed by user.
927 * This is the fundamental unit of time (in seconds) in terms
928 * of which frame timestamps are represented. For fixed-fps content,
929 * timebase should be 1/framerate and timestamp increments should be
931 * - encoding: MUST be set by user.
932 * - decoding: Set by libavcodec.
934 AVRational time_base;
938 * picture width / height.
939 * - encoding: MUST be set by user.
940 * - decoding: Set by libavcodec.
941 * Note: For compatibility it is possible to set this instead of
942 * coded_width/height before decoding.
946 #define FF_ASPECT_EXTENDED 15
949 * the number of pictures in a group of pictures, or 0 for intra_only
950 * - encoding: Set by user.
956 * Pixel format, see PIX_FMT_xxx.
957 * - encoding: Set by user.
958 * - decoding: Set by libavcodec.
960 enum PixelFormat pix_fmt;
963 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
964 * has to read frames at native frame rate.
965 * - encoding: Set by user.
971 * If non NULL, 'draw_horiz_band' is called by the libavcodec
972 * decoder to draw a horizontal band. It improves cache usage. Not
973 * all codecs can do that. You must check the codec capabilities
975 * The function is also used by hardware acceleration APIs.
976 * It is called at least once during frame decoding to pass
977 * the data needed for hardware render.
978 * In that mode instead of pixel data, AVFrame points to
979 * a structure specific to the acceleration API. The application
980 * reads the structure and can change some fields to indicate progress
983 * - decoding: Set by user.
984 * @param height the height of the slice
985 * @param y the y position of the slice
986 * @param type 1->top field, 2->bottom field, 3->frame
987 * @param offset offset into the AVFrame.data from which the slice should be read
989 void (*draw_horiz_band)(struct AVCodecContext *s,
990 const AVFrame *src, int offset[4],
991 int y, int type, int height);
994 int sample_rate; ///< samples per second
995 int channels; ///< number of audio channels
998 * audio sample format
999 * - encoding: Set by user.
1000 * - decoding: Set by libavcodec.
1002 enum SampleFormat sample_fmt; ///< sample format, currently unused
1004 /* The following data should not be initialized. */
1006 * Samples per packet, initialized when calling 'init'.
1009 int frame_number; ///< audio or video frame number
1010 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1013 * Number of frames the decoded output will be delayed relative to
1014 * the encoded input.
1015 * - encoding: Set by libavcodec.
1016 * - decoding: unused
1020 /* - encoding parameters */
1021 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1022 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1026 * - encoding: Set by user.
1027 * - decoding: unused
1033 * - encoding: Set by user.
1034 * - decoding: unused
1039 * maximum quantizer difference between frames
1040 * - encoding: Set by user.
1041 * - decoding: unused
1046 * maximum number of B-frames between non-B-frames
1047 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1048 * - encoding: Set by user.
1049 * - decoding: unused
1054 * qscale factor between IP and B-frames
1055 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1056 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1057 * - encoding: Set by user.
1058 * - decoding: unused
1060 float b_quant_factor;
1062 /** obsolete FIXME remove */
1064 #define FF_RC_STRATEGY_XVID 1
1066 int b_frame_strategy;
1070 * - encoding: unused
1071 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1072 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1076 struct AVCodec *codec;
1080 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1081 /* do its best to deliver a chunk with size */
1082 /* below rtp_payload_size, the chunk will start */
1083 /* with a start code on some codecs like H.263. */
1084 /* This doesn't take account of any particular */
1085 /* headers inside the transmitted RTP payload. */
1088 /* The RTP callback: This function is called */
1089 /* every time the encoder has a packet to send. */
1090 /* It depends on the encoder if the data starts */
1091 /* with a Start Code (it should). H.263 does. */
1092 /* mb_nb contains the number of macroblocks */
1093 /* encoded in the RTP payload. */
1094 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1096 /* statistics, used for 2-pass encoding */
1107 * number of bits used for the previously encoded frame
1108 * - encoding: Set by libavcodec.
1109 * - decoding: unused
1114 * Private data of the user, can be used to carry app specific stuff.
1115 * - encoding: Set by user.
1116 * - decoding: Set by user.
1120 char codec_name[32];
1121 enum CodecType codec_type; /* see CODEC_TYPE_xxx */
1122 enum CodecID codec_id; /* see CODEC_ID_xxx */
1125 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1126 * This is used to work around some encoder bugs.
1127 * A demuxer should set this to what is stored in the field used to identify the codec.
1128 * If there are multiple such fields in a container then the demuxer should choose the one
1129 * which maximizes the information about the used codec.
1130 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1131 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1132 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1134 * - encoding: Set by user, if not then the default based on codec_id will be used.
1135 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1137 unsigned int codec_tag;
1140 * Work around bugs in encoders which sometimes cannot be detected automatically.
1141 * - encoding: Set by user
1142 * - decoding: Set by user
1144 int workaround_bugs;
1145 #define FF_BUG_AUTODETECT 1 ///< autodetection
1146 #define FF_BUG_OLD_MSMPEG4 2
1147 #define FF_BUG_XVID_ILACE 4
1148 #define FF_BUG_UMP4 8
1149 #define FF_BUG_NO_PADDING 16
1150 #define FF_BUG_AMV 32
1151 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1152 #define FF_BUG_QPEL_CHROMA 64
1153 #define FF_BUG_STD_QPEL 128
1154 #define FF_BUG_QPEL_CHROMA2 256
1155 #define FF_BUG_DIRECT_BLOCKSIZE 512
1156 #define FF_BUG_EDGE 1024
1157 #define FF_BUG_HPEL_CHROMA 2048
1158 #define FF_BUG_DC_CLIP 4096
1159 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1160 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1163 * luma single coefficient elimination threshold
1164 * - encoding: Set by user.
1165 * - decoding: unused
1167 int luma_elim_threshold;
1170 * chroma single coeff elimination threshold
1171 * - encoding: Set by user.
1172 * - decoding: unused
1174 int chroma_elim_threshold;
1177 * strictly follow the standard (MPEG4, ...).
1178 * - encoding: Set by user.
1179 * - decoding: Set by user.
1180 * Setting this to STRICT or higher means the encoder and decoder will
1181 * generally do stupid things. While setting it to inofficial or lower
1182 * will mean the encoder might use things that are not supported by all
1183 * spec compliant decoders. Decoders make no difference between normal,
1184 * inofficial and experimental, that is they always try to decode things
1185 * when they can unless they are explicitly asked to behave stupid
1186 * (=strictly conform to the specs)
1188 int strict_std_compliance;
1189 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1190 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1191 #define FF_COMPLIANCE_NORMAL 0
1192 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1193 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1196 * qscale offset between IP and B-frames
1197 * - encoding: Set by user.
1198 * - decoding: unused
1200 float b_quant_offset;
1203 * Error recognization; higher values will detect more errors but may
1204 * misdetect some more or less valid parts as errors.
1205 * - encoding: unused
1206 * - decoding: Set by user.
1208 int error_recognition;
1209 #define FF_ER_CAREFUL 1
1210 #define FF_ER_COMPLIANT 2
1211 #define FF_ER_AGGRESSIVE 3
1212 #define FF_ER_VERY_AGGRESSIVE 4
1215 * Called at the beginning of each frame to get a buffer for it.
1216 * If pic.reference is set then the frame will be read later by libavcodec.
1217 * avcodec_align_dimensions() should be used to find the required width and
1218 * height, as they normally need to be rounded up to the next multiple of 16.
1219 * - encoding: unused
1220 * - decoding: Set by libavcodec., user can override.
1222 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1225 * Called to release buffers which were allocated with get_buffer.
1226 * A released buffer can be reused in get_buffer().
1227 * pic.data[*] must be set to NULL.
1228 * - encoding: unused
1229 * - decoding: Set by libavcodec., user can override.
1231 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1234 * Size of the frame reordering buffer in the decoder.
1235 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1236 * - encoding: Set by libavcodec.
1237 * - decoding: Set by libavcodec.
1242 * number of bytes per packet if constant and known or 0
1243 * Used by some WAV based audio codecs.
1247 int parse_only; /* - decoding only: If true, only parsing is done
1248 (function avcodec_parse_frame()). The frame
1249 data is returned. Only MPEG codecs support this now. */
1252 * 0-> h263 quant 1-> mpeg quant
1253 * - encoding: Set by user.
1254 * - decoding: unused
1259 * pass1 encoding statistics output buffer
1260 * - encoding: Set by libavcodec.
1261 * - decoding: unused
1266 * pass2 encoding statistics input buffer
1267 * Concatenated stuff from stats_out of pass1 should be placed here.
1268 * - encoding: Allocated/set/freed by user.
1269 * - decoding: unused
1274 * ratecontrol qmin qmax limiting method
1275 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1276 * - encoding: Set by user.
1277 * - decoding: unused
1285 * ratecontrol override, see RcOverride
1286 * - encoding: Allocated/set/freed by user.
1287 * - decoding: unused
1289 RcOverride *rc_override;
1290 int rc_override_count;
1293 * rate control equation
1294 * - encoding: Set by user
1295 * - decoding: unused
1301 * - encoding: Set by user.
1302 * - decoding: unused
1308 * - encoding: Set by user.
1309 * - decoding: unused
1314 * decoder bitstream buffer size
1315 * - encoding: Set by user.
1316 * - decoding: unused
1319 float rc_buffer_aggressivity;
1322 * qscale factor between P and I-frames
1323 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1324 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1325 * - encoding: Set by user.
1326 * - decoding: unused
1328 float i_quant_factor;
1331 * qscale offset between P and I-frames
1332 * - encoding: Set by user.
1333 * - decoding: unused
1335 float i_quant_offset;
1338 * initial complexity for pass1 ratecontrol
1339 * - encoding: Set by user.
1340 * - decoding: unused
1342 float rc_initial_cplx;
1345 * DCT algorithm, see FF_DCT_* below
1346 * - encoding: Set by user.
1347 * - decoding: unused
1350 #define FF_DCT_AUTO 0
1351 #define FF_DCT_FASTINT 1
1352 #define FF_DCT_INT 2
1353 #define FF_DCT_MMX 3
1354 #define FF_DCT_MLIB 4
1355 #define FF_DCT_ALTIVEC 5
1356 #define FF_DCT_FAAN 6
1359 * luminance masking (0-> disabled)
1360 * - encoding: Set by user.
1361 * - decoding: unused
1366 * temporary complexity masking (0-> disabled)
1367 * - encoding: Set by user.
1368 * - decoding: unused
1370 float temporal_cplx_masking;
1373 * spatial complexity masking (0-> disabled)
1374 * - encoding: Set by user.
1375 * - decoding: unused
1377 float spatial_cplx_masking;
1380 * p block masking (0-> disabled)
1381 * - encoding: Set by user.
1382 * - decoding: unused
1387 * darkness masking (0-> disabled)
1388 * - encoding: Set by user.
1389 * - decoding: unused
1394 * IDCT algorithm, see FF_IDCT_* below.
1395 * - encoding: Set by user.
1396 * - decoding: Set by user.
1399 #define FF_IDCT_AUTO 0
1400 #define FF_IDCT_INT 1
1401 #define FF_IDCT_SIMPLE 2
1402 #define FF_IDCT_SIMPLEMMX 3
1403 #define FF_IDCT_LIBMPEG2MMX 4
1404 #define FF_IDCT_PS2 5
1405 #define FF_IDCT_MLIB 6
1406 #define FF_IDCT_ARM 7
1407 #define FF_IDCT_ALTIVEC 8
1408 #define FF_IDCT_SH4 9
1409 #define FF_IDCT_SIMPLEARM 10
1410 #define FF_IDCT_H264 11
1411 #define FF_IDCT_VP3 12
1412 #define FF_IDCT_IPP 13
1413 #define FF_IDCT_XVIDMMX 14
1414 #define FF_IDCT_CAVS 15
1415 #define FF_IDCT_SIMPLEARMV5TE 16
1416 #define FF_IDCT_SIMPLEARMV6 17
1417 #define FF_IDCT_SIMPLEVIS 18
1418 #define FF_IDCT_WMV2 19
1419 #define FF_IDCT_FAAN 20
1420 #define FF_IDCT_EA 21
1421 #define FF_IDCT_SIMPLENEON 22
1422 #define FF_IDCT_SIMPLEALPHA 23
1426 * - encoding: Set by libavcodec.
1427 * - decoding: Set by user (or 0).
1431 * slice offsets in the frame in bytes
1432 * - encoding: Set/allocated by libavcodec.
1433 * - decoding: Set/allocated by user (or NULL).
1438 * error concealment flags
1439 * - encoding: unused
1440 * - decoding: Set by user.
1442 int error_concealment;
1443 #define FF_EC_GUESS_MVS 1
1444 #define FF_EC_DEBLOCK 2
1447 * dsp_mask could be add used to disable unwanted CPU features
1448 * CPU features (i.e. MMX, SSE. ...)
1450 * With the FORCE flag you may instead enable given CPU features.
1451 * (Dangerous: Usable in case of misdetection, improper usage however will
1452 * result into program crash.)
1455 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1456 /* lower 16 bits - CPU features */
1457 #define FF_MM_MMX 0x0001 ///< standard MMX
1458 #define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
1459 #define FF_MM_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
1460 #define FF_MM_SSE 0x0008 ///< SSE functions
1461 #define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
1462 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1463 #define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
1464 #define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
1465 #define FF_MM_SSE4 0x0100 ///< Penryn SSE4.1 functions
1466 #define FF_MM_SSE42 0x0200 ///< Nehalem SSE4.2 functions
1467 #define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
1468 #define FF_MM_ALTIVEC 0x0001 ///< standard AltiVec
1471 * bits per sample/pixel from the demuxer (needed for huffyuv).
1472 * - encoding: Set by libavcodec.
1473 * - decoding: Set by user.
1475 int bits_per_coded_sample;
1478 * prediction method (needed for huffyuv)
1479 * - encoding: Set by user.
1480 * - decoding: unused
1482 int prediction_method;
1483 #define FF_PRED_LEFT 0
1484 #define FF_PRED_PLANE 1
1485 #define FF_PRED_MEDIAN 2
1488 * sample aspect ratio (0 if unknown)
1489 * That is the width of a pixel divided by the height of the pixel.
1490 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1491 * - encoding: Set by user.
1492 * - decoding: Set by libavcodec.
1494 AVRational sample_aspect_ratio;
1497 * the picture in the bitstream
1498 * - encoding: Set by libavcodec.
1499 * - decoding: Set by libavcodec.
1501 AVFrame *coded_frame;
1505 * - encoding: Set by user.
1506 * - decoding: Set by user.
1509 #define FF_DEBUG_PICT_INFO 1
1510 #define FF_DEBUG_RC 2
1511 #define FF_DEBUG_BITSTREAM 4
1512 #define FF_DEBUG_MB_TYPE 8
1513 #define FF_DEBUG_QP 16
1514 #define FF_DEBUG_MV 32
1515 #define FF_DEBUG_DCT_COEFF 0x00000040
1516 #define FF_DEBUG_SKIP 0x00000080
1517 #define FF_DEBUG_STARTCODE 0x00000100
1518 #define FF_DEBUG_PTS 0x00000200
1519 #define FF_DEBUG_ER 0x00000400
1520 #define FF_DEBUG_MMCO 0x00000800
1521 #define FF_DEBUG_BUGS 0x00001000
1522 #define FF_DEBUG_VIS_QP 0x00002000
1523 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1524 #define FF_DEBUG_BUFFERS 0x00008000
1528 * - encoding: Set by user.
1529 * - decoding: Set by user.
1532 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1533 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1534 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1538 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1539 * - decoding: unused
1544 * minimum MB quantizer
1545 * - encoding: unused
1546 * - decoding: unused
1551 * maximum MB quantizer
1552 * - encoding: unused
1553 * - decoding: unused
1558 * motion estimation comparison function
1559 * - encoding: Set by user.
1560 * - decoding: unused
1564 * subpixel motion estimation comparison function
1565 * - encoding: Set by user.
1566 * - decoding: unused
1570 * macroblock comparison function (not supported yet)
1571 * - encoding: Set by user.
1572 * - decoding: unused
1576 * interlaced DCT comparison function
1577 * - encoding: Set by user.
1578 * - decoding: unused
1581 #define FF_CMP_SAD 0
1582 #define FF_CMP_SSE 1
1583 #define FF_CMP_SATD 2
1584 #define FF_CMP_DCT 3
1585 #define FF_CMP_PSNR 4
1586 #define FF_CMP_BIT 5
1588 #define FF_CMP_ZERO 7
1589 #define FF_CMP_VSAD 8
1590 #define FF_CMP_VSSE 9
1591 #define FF_CMP_NSSE 10
1592 #define FF_CMP_W53 11
1593 #define FF_CMP_W97 12
1594 #define FF_CMP_DCTMAX 13
1595 #define FF_CMP_DCT264 14
1596 #define FF_CMP_CHROMA 256
1599 * ME diamond size & shape
1600 * - encoding: Set by user.
1601 * - decoding: unused
1606 * amount of previous MV predictors (2a+1 x 2a+1 square)
1607 * - encoding: Set by user.
1608 * - decoding: unused
1610 int last_predictor_count;
1613 * prepass for motion estimation
1614 * - encoding: Set by user.
1615 * - decoding: unused
1620 * motion estimation prepass comparison function
1621 * - encoding: Set by user.
1622 * - decoding: unused
1627 * ME prepass diamond size & shape
1628 * - encoding: Set by user.
1629 * - decoding: unused
1635 * - encoding: Set by user.
1636 * - decoding: unused
1638 int me_subpel_quality;
1641 * callback to negotiate the pixelFormat
1642 * @param fmt is the list of formats which are supported by the codec,
1643 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1644 * The first is always the native one.
1645 * @return the chosen format
1646 * - encoding: unused
1647 * - decoding: Set by user, if not set the native format will be chosen.
1649 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1652 * DTG active format information (additional aspect ratio
1653 * information only used in DVB MPEG-2 transport streams)
1656 * - encoding: unused
1657 * - decoding: Set by decoder.
1659 int dtg_active_format;
1660 #define FF_DTG_AFD_SAME 8
1661 #define FF_DTG_AFD_4_3 9
1662 #define FF_DTG_AFD_16_9 10
1663 #define FF_DTG_AFD_14_9 11
1664 #define FF_DTG_AFD_4_3_SP_14_9 13
1665 #define FF_DTG_AFD_16_9_SP_14_9 14
1666 #define FF_DTG_AFD_SP_4_3 15
1669 * maximum motion estimation search range in subpel units
1670 * If 0 then no limit.
1672 * - encoding: Set by user.
1673 * - decoding: unused
1678 * intra quantizer bias
1679 * - encoding: Set by user.
1680 * - decoding: unused
1682 int intra_quant_bias;
1683 #define FF_DEFAULT_QUANT_BIAS 999999
1686 * inter quantizer bias
1687 * - encoding: Set by user.
1688 * - decoding: unused
1690 int inter_quant_bias;
1694 * - encoding: unused
1695 * - decoding: Which clrtable should be used for 8bit RGB images.
1696 * Tables have to be stored somewhere. FIXME
1701 * internal_buffer count
1702 * Don't touch, used by libavcodec default_get_buffer().
1704 int internal_buffer_count;
1708 * Don't touch, used by libavcodec default_get_buffer().
1710 void *internal_buffer;
1712 #define FF_LAMBDA_SHIFT 7
1713 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1714 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1715 #define FF_LAMBDA_MAX (256*128-1)
1717 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1719 * Global quality for codecs which cannot change it per frame.
1720 * This should be proportional to MPEG-1/2/4 qscale.
1721 * - encoding: Set by user.
1722 * - decoding: unused
1726 #define FF_CODER_TYPE_VLC 0
1727 #define FF_CODER_TYPE_AC 1
1728 #define FF_CODER_TYPE_RAW 2
1729 #define FF_CODER_TYPE_RLE 3
1730 #define FF_CODER_TYPE_DEFLATE 4
1733 * - encoding: Set by user.
1734 * - decoding: unused
1740 * - encoding: Set by user.
1741 * - decoding: unused
1747 * - encoding: unused
1748 * - decoding: Set by user.
1750 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1755 * - encoding: unused
1756 * - decoding: Set by user.
1759 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1760 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1761 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1764 * XVideo Motion Acceleration
1765 * - encoding: forbidden
1766 * - decoding: set by decoder
1768 int xvmc_acceleration;
1771 * macroblock decision mode
1772 * - encoding: Set by user.
1773 * - decoding: unused
1776 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1777 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1778 #define FF_MB_DECISION_RD 2 ///< rate distortion
1781 * custom intra quantization matrix
1782 * - encoding: Set by user, can be NULL.
1783 * - decoding: Set by libavcodec.
1785 uint16_t *intra_matrix;
1788 * custom inter quantization matrix
1789 * - encoding: Set by user, can be NULL.
1790 * - decoding: Set by libavcodec.
1792 uint16_t *inter_matrix;
1795 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1796 * This is used to work around some encoder bugs.
1797 * - encoding: unused
1798 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1800 unsigned int stream_codec_tag;
1803 * scene change detection threshold
1804 * 0 is default, larger means fewer detected scene changes.
1805 * - encoding: Set by user.
1806 * - decoding: unused
1808 int scenechange_threshold;
1811 * minimum Lagrange multipler
1812 * - encoding: Set by user.
1813 * - decoding: unused
1818 * maximum Lagrange multipler
1819 * - encoding: Set by user.
1820 * - decoding: unused
1825 * palette control structure
1826 * - encoding: ??? (no palette-enabled encoder yet)
1827 * - decoding: Set by user.
1829 struct AVPaletteControl *palctrl;
1832 * noise reduction strength
1833 * - encoding: Set by user.
1834 * - decoding: unused
1836 int noise_reduction;
1839 * Called at the beginning of a frame to get cr buffer for it.
1840 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1841 * libavcodec will pass previous buffer in pic, function should return
1842 * same buffer or new buffer with old frame "painted" into it.
1843 * If pic.data[0] == NULL must behave like get_buffer().
1844 * - encoding: unused
1845 * - decoding: Set by libavcodec., user can override
1847 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1850 * Number of bits which should be loaded into the rc buffer before decoding starts.
1851 * - encoding: Set by user.
1852 * - decoding: unused
1854 int rc_initial_buffer_occupancy;
1858 * - encoding: Set by user.
1859 * - decoding: unused
1861 int inter_threshold;
1865 * - encoding: Set by user.
1866 * - decoding: Set by user.
1871 * Simulates errors in the bitstream to test error concealment.
1872 * - encoding: Set by user.
1873 * - decoding: unused
1878 * MP3 antialias algorithm, see FF_AA_* below.
1879 * - encoding: unused
1880 * - decoding: Set by user.
1883 #define FF_AA_AUTO 0
1884 #define FF_AA_FASTINT 1 //not implemented yet
1886 #define FF_AA_FLOAT 3
1888 * quantizer noise shaping
1889 * - encoding: Set by user.
1890 * - decoding: unused
1892 int quantizer_noise_shaping;
1896 * is used to decide how many independent tasks should be passed to execute()
1897 * - encoding: Set by user.
1898 * - decoding: Set by user.
1903 * The codec may call this to execute several independent things.
1904 * It will return only after finishing all tasks.
1905 * The user may replace this with some multithreaded implementation,
1906 * the default implementation will execute the parts serially.
1907 * @param count the number of things to execute
1908 * - encoding: Set by libavcodec, user can override.
1909 * - decoding: Set by libavcodec, user can override.
1911 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
1915 * Can be used by execute() to store some per AVCodecContext stuff.
1916 * - encoding: set by execute()
1917 * - decoding: set by execute()
1919 void *thread_opaque;
1922 * Motion estimation threshold below which no motion estimation is
1923 * performed, but instead the user specified motion vectors are used.
1925 * - encoding: Set by user.
1926 * - decoding: unused
1931 * Macroblock threshold below which the user specified macroblock types will be used.
1932 * - encoding: Set by user.
1933 * - decoding: unused
1938 * precision of the intra DC coefficient - 8
1939 * - encoding: Set by user.
1940 * - decoding: unused
1942 int intra_dc_precision;
1945 * noise vs. sse weight for the nsse comparsion function
1946 * - encoding: Set by user.
1947 * - decoding: unused
1952 * Number of macroblock rows at the top which are skipped.
1953 * - encoding: unused
1954 * - decoding: Set by user.
1959 * Number of macroblock rows at the bottom which are skipped.
1960 * - encoding: unused
1961 * - decoding: Set by user.
1967 * - encoding: Set by user.
1968 * - decoding: Set by libavcodec.
1971 #define FF_PROFILE_UNKNOWN -99
1972 #define FF_PROFILE_AAC_MAIN 0
1973 #define FF_PROFILE_AAC_LOW 1
1974 #define FF_PROFILE_AAC_SSR 2
1975 #define FF_PROFILE_AAC_LTP 3
1979 * - encoding: Set by user.
1980 * - decoding: Set by libavcodec.
1983 #define FF_LEVEL_UNKNOWN -99
1986 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1987 * - encoding: unused
1988 * - decoding: Set by user.
1993 * Bitstream width / height, may be different from width/height if lowres
1994 * or other things are used.
1995 * - encoding: unused
1996 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1998 int coded_width, coded_height;
2001 * frame skip threshold
2002 * - encoding: Set by user.
2003 * - decoding: unused
2005 int frame_skip_threshold;
2009 * - encoding: Set by user.
2010 * - decoding: unused
2012 int frame_skip_factor;
2015 * frame skip exponent
2016 * - encoding: Set by user.
2017 * - decoding: unused
2022 * frame skip comparison function
2023 * - encoding: Set by user.
2024 * - decoding: unused
2029 * Border processing masking, raises the quantizer for mbs on the borders
2031 * - encoding: Set by user.
2032 * - decoding: unused
2034 float border_masking;
2037 * minimum MB lagrange multipler
2038 * - encoding: Set by user.
2039 * - decoding: unused
2044 * maximum MB lagrange multipler
2045 * - encoding: Set by user.
2046 * - decoding: unused
2052 * - encoding: Set by user.
2053 * - decoding: unused
2055 int me_penalty_compensation;
2059 * - encoding: unused
2060 * - decoding: Set by user.
2062 enum AVDiscard skip_loop_filter;
2066 * - encoding: unused
2067 * - decoding: Set by user.
2069 enum AVDiscard skip_idct;
2073 * - encoding: unused
2074 * - decoding: Set by user.
2076 enum AVDiscard skip_frame;
2080 * - encoding: Set by user.
2081 * - decoding: unused
2087 * - encoding: Set by user.
2088 * - decoding: unused
2093 * constant rate factor - quality-based VBR - values ~correspond to qps
2094 * - encoding: Set by user.
2095 * - decoding: unused
2100 * constant quantization parameter rate control method
2101 * - encoding: Set by user.
2102 * - decoding: unused
2108 * - encoding: Set by user.
2109 * - decoding: unused
2114 * number of reference frames
2115 * - encoding: Set by user.
2116 * - decoding: Set by lavc.
2121 * chroma qp offset from luma
2122 * - encoding: Set by user.
2123 * - decoding: unused
2128 * Influences how often B-frames are used.
2129 * - encoding: Set by user.
2130 * - decoding: unused
2135 * trellis RD quantization
2136 * - encoding: Set by user.
2137 * - decoding: unused
2142 * Reduce fluctuations in qp (before curve compression).
2143 * - encoding: Set by user.
2144 * - decoding: unused
2146 float complexityblur;
2149 * in-loop deblocking filter alphac0 parameter
2150 * alpha is in the range -6...6
2151 * - encoding: Set by user.
2152 * - decoding: unused
2157 * in-loop deblocking filter beta parameter
2158 * beta is in the range -6...6
2159 * - encoding: Set by user.
2160 * - decoding: unused
2165 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2166 * - encoding: Set by user.
2167 * - decoding: unused
2170 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2171 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2172 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2173 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2174 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2177 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2178 * - encoding: Set by user.
2179 * - decoding: unused
2184 * Audio cutoff bandwidth (0 means "automatic")
2185 * - encoding: Set by user.
2186 * - decoding: unused
2191 * Multiplied by qscale for each frame and added to scene_change_score.
2192 * - encoding: Set by user.
2193 * - decoding: unused
2195 int scenechange_factor;
2199 * Note: Value depends upon the compare function used for fullpel ME.
2200 * - encoding: Set by user.
2201 * - decoding: unused
2206 * Adjusts sensitivity of b_frame_strategy 1.
2207 * - encoding: Set by user.
2208 * - decoding: unused
2213 * - encoding: Set by user.
2214 * - decoding: unused
2216 int compression_level;
2217 #define FF_COMPRESSION_DEFAULT -1
2220 * Sets whether to use LPC mode - used by FLAC encoder.
2221 * - encoding: Set by user.
2222 * - decoding: unused
2227 * LPC coefficient precision - used by FLAC encoder
2228 * - encoding: Set by user.
2229 * - decoding: unused
2231 int lpc_coeff_precision;
2234 * - encoding: Set by user.
2235 * - decoding: unused
2237 int min_prediction_order;
2240 * - encoding: Set by user.
2241 * - decoding: unused
2243 int max_prediction_order;
2246 * search method for selecting prediction order
2247 * - encoding: Set by user.
2248 * - decoding: unused
2250 int prediction_order_method;
2253 * - encoding: Set by user.
2254 * - decoding: unused
2256 int min_partition_order;
2259 * - encoding: Set by user.
2260 * - decoding: unused
2262 int max_partition_order;
2265 * GOP timecode frame start number, in non drop frame format
2266 * - encoding: Set by user.
2267 * - decoding: unused
2269 int64_t timecode_frame_start;
2271 #if LIBAVCODEC_VERSION_MAJOR < 53
2273 * Decoder should decode to this many channels if it can (0 for default)
2274 * - encoding: unused
2275 * - decoding: Set by user.
2276 * @deprecated Deprecated in favor of request_channel_layout.
2278 int request_channels;
2282 * Percentage of dynamic range compression to be applied by the decoder.
2283 * The default value is 1.0, corresponding to full compression.
2284 * - encoding: unused
2285 * - decoding: Set by user.
2290 * opaque 64bit number (generally a PTS) that will be reordered and
2291 * output in AVFrame.reordered_opaque
2292 * - encoding: unused
2293 * - decoding: Set by user.
2295 int64_t reordered_opaque;
2298 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2299 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2300 * - encoding: set by user.
2301 * - decoding: set by libavcodec.
2303 int bits_per_raw_sample;
2306 * Audio channel layout.
2307 * - encoding: set by user.
2308 * - decoding: set by libavcodec.
2310 int64_t channel_layout;
2313 * Request decoder to use this channel layout if it can (0 for default)
2314 * - encoding: unused
2315 * - decoding: Set by user.
2317 int64_t request_channel_layout;
2320 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2321 * - encoding: Set by user.
2322 * - decoding: unused.
2324 float rc_max_available_vbv_use;
2327 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2328 * - encoding: Set by user.
2329 * - decoding: unused.
2331 float rc_min_vbv_overflow_use;
2334 * Hardware accelerator in use
2335 * - encoding: unused.
2336 * - decoding: Set by libavcodec
2338 struct AVHWAccel *hwaccel;
2341 * For some codecs, the time base is closer to the field rate than the frame rate.
2342 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2343 * if no telecine is used ...
2345 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2347 int ticks_per_frame;
2350 * Hardware accelerator context.
2351 * For some hardware accelerators, a global context needs to be
2352 * provided by the user. In that case, this holds display-dependent
2353 * data FFmpeg cannot instantiate itself. Please refer to the
2354 * FFmpeg HW accelerator documentation to know how to fill this
2355 * is. e.g. for VA API, this is a struct vaapi_context.
2356 * - encoding: unused
2357 * - decoding: Set by user
2359 void *hwaccel_context;
2365 typedef struct AVCodec {
2367 * Name of the codec implementation.
2368 * The name is globally unique among encoders and among decoders (but an
2369 * encoder and a decoder can share the same name).
2370 * This is the primary way to find a codec from the user perspective.
2373 enum CodecType type;
2376 int (*init)(AVCodecContext *);
2377 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2378 int (*close)(AVCodecContext *);
2379 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size,
2380 const uint8_t *buf, int buf_size);
2382 * Codec capabilities.
2386 struct AVCodec *next;
2389 * Will be called when seeking
2391 void (*flush)(AVCodecContext *);
2392 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2393 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2395 * Descriptive name for the codec, meant to be more human readable than \p name.
2396 * You \e should use the NULL_IF_CONFIG_SMALL() macro to define it.
2398 const char *long_name;
2399 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2400 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2401 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2407 typedef struct AVHWAccel {
2409 * Name of the hardware accelerated codec.
2410 * The name is globally unique among encoders and among decoders (but an
2411 * encoder and a decoder can share the same name).
2416 * Type of codec implemented by the hardware accelerator.
2418 * See CODEC_TYPE_xxx
2420 enum CodecType type;
2423 * Codec implemented by the hardware accelerator.
2430 * Supported pixel format.
2432 * Only hardware accelerated formats are supported here.
2434 enum PixelFormat pix_fmt;
2437 * Hardware accelerated codec capabilities.
2438 * see FF_HWACCEL_CODEC_CAP_*
2442 struct AVHWAccel *next;
2445 * Called at the beginning of each frame or field picture.
2447 * Meaningful frame information (codec specific) is guaranteed to
2448 * be parsed at this point. This function is mandatory.
2450 * Note that \p buf can be NULL along with \p buf_size set to 0.
2451 * Otherwise, this means the whole frame is available at this point.
2453 * @param avctx the codec context
2454 * @param buf the frame data buffer base
2455 * @param buf_size the size of the frame in bytes
2456 * @return zero if successful, a negative value otherwise
2458 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2461 * Callback for each slice.
2463 * Meaningful slice information (codec specific) is guaranteed to
2464 * be parsed at this point. This function is mandatory.
2466 * @param avctx the codec context
2467 * @param buf the slice data buffer base
2468 * @param buf_size the size of the slice in bytes
2469 * @return zero if successful, a negative value otherwise
2471 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2474 * Called at the end of each frame or field picture.
2476 * The whole picture is parsed at this point and can now be sent
2477 * to the hardware accelerator. This function is mandatory.
2479 * @param avctx the codec context
2480 * @return zero if successful, a negative value otherwise
2482 int (*end_frame)(AVCodecContext *avctx);
2485 * Size of HW accelerator private data.
2487 * Private data is allocated with av_mallocz() before
2488 * AVCodecContext.get_buffer() and deallocated after
2489 * AVCodecContext.release_buffer().
2495 * four components are given, that's all.
2496 * the last component is alpha
2498 typedef struct AVPicture {
2500 int linesize[4]; ///< number of bytes per line
2503 #if LIBAVCODEC_VERSION_MAJOR < 53
2506 * This structure defines a method for communicating palette changes
2507 * between and demuxer and a decoder.
2509 * @deprecated Use AVPacket to send palette changes instead.
2510 * This is totally broken.
2512 #define AVPALETTE_SIZE 1024
2513 #define AVPALETTE_COUNT 256
2514 typedef struct AVPaletteControl {
2516 /* Demuxer sets this to 1 to indicate the palette has changed;
2517 * decoder resets to 0. */
2518 int palette_changed;
2520 /* 4-byte ARGB palette entries, stored in native byte order; note that
2521 * the individual palette components should be on a 8-bit scale; if
2522 * the palette data comes from an IBM VGA native format, the component
2523 * data is probably 6 bits in size and needs to be scaled. */
2524 unsigned int palette[AVPALETTE_COUNT];
2526 } AVPaletteControl attribute_deprecated;
2529 typedef struct AVPacket {
2531 * Presentation timestamp in time_base units; the time at which the
2532 * decompressed packet will be presented to the user.
2533 * Can be AV_NOPTS_VALUE if it is not stored in the file.
2534 * pts MUST be larger or equal to dts as presentation cannot happen before
2535 * decompression, unless one wants to view hex dumps. Some formats misuse
2536 * the terms dts and pts/cts to mean something different. Such timestamps
2537 * must be converted to true pts/dts before they are stored in AVPacket.
2541 * Decompression timestamp in time_base units; the time at which the
2542 * packet is decompressed.
2543 * Can be AV_NOPTS_VALUE if it is not stored in the file.
2551 * Duration of this packet in time_base units, 0 if unknown.
2552 * Equals next_pts - this_pts in presentation order.
2555 void (*destruct)(struct AVPacket *);
2557 int64_t pos; ///< byte position in stream, -1 if unknown
2560 * Time difference in stream time base units from the pts of this
2561 * packet to the point at which the output from the decoder has converged
2562 * independent from the availability of previous frames. That is, the
2563 * frames are virtually identical no matter if decoding started from
2564 * the very first frame or from this keyframe.
2565 * Is AV_NOPTS_VALUE if unknown.
2566 * This field is not the display duration of the current packet.
2568 * The purpose of this field is to allow seeking in streams that have no
2569 * keyframes in the conventional sense. It corresponds to the
2570 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
2571 * essential for some types of subtitle streams to ensure that all
2572 * subtitles are correctly displayed after seeking.
2574 int64_t convergence_duration;
2576 #define PKT_FLAG_KEY 0x0001
2578 enum AVSubtitleType {
2581 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2584 * Plain text, the text field must be set by the decoder and is
2585 * authoritative. ass and pict fields may contain approximations.
2590 * Formatted text, the ass field must be set by the decoder and is
2591 * authoritative. pict and text fields may contain approximations.
2596 typedef struct AVSubtitleRect {
2597 int x; ///< top left corner of pict, undefined when pict is not set
2598 int y; ///< top left corner of pict, undefined when pict is not set
2599 int w; ///< width of pict, undefined when pict is not set
2600 int h; ///< height of pict, undefined when pict is not set
2601 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2604 * data+linesize for the bitmap of this subtitle.
2605 * can be set for text/ass as well once they where rendered
2608 enum AVSubtitleType type;
2610 char *text; ///< 0 terminated plain UTF-8 text
2613 * 0 terminated ASS/SSA compatible event line.
2614 * The pressentation of this is unaffected by the other values in this
2620 typedef struct AVSubtitle {
2621 uint16_t format; /* 0 = graphics */
2622 uint32_t start_display_time; /* relative to packet pts, in ms */
2623 uint32_t end_display_time; /* relative to packet pts, in ms */
2625 AVSubtitleRect **rects;
2631 struct ReSampleContext;
2632 struct AVResampleContext;
2634 typedef struct ReSampleContext ReSampleContext;
2636 #if LIBAVCODEC_VERSION_MAJOR < 53
2638 * @deprecated Use av_audio_resample_init() instead.
2640 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2641 int output_rate, int input_rate);
2644 * Initializes audio resampling context
2646 * @param output_channels number of output channels
2647 * @param input_channels number of input channels
2648 * @param output_rate output sample rate
2649 * @param input_rate input sample rate
2650 * @param sample_fmt_out requested output sample format
2651 * @param sample_fmt_in input sample format
2652 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2653 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2654 * @param linear If 1 then the used FIR filter will be linearly interpolated
2655 between the 2 closest, if 0 the closest will be used
2656 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2657 * @return allocated ReSampleContext, NULL if error occured
2659 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
2660 int output_rate, int input_rate,
2661 enum SampleFormat sample_fmt_out,
2662 enum SampleFormat sample_fmt_in,
2663 int filter_length, int log2_phase_count,
2664 int linear, double cutoff);
2666 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2667 void audio_resample_close(ReSampleContext *s);
2671 * Initializes an audio resampler.
2672 * Note, if either rate is not an integer then simply scale both rates up so they are.
2673 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2674 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2675 * @param linear If 1 then the used FIR filter will be linearly interpolated
2676 between the 2 closest, if 0 the closest will be used
2677 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2679 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2683 * @param src an array of unconsumed samples
2684 * @param consumed the number of samples of src which have been consumed are returned here
2685 * @param src_size the number of unconsumed samples available
2686 * @param dst_size the amount of space in samples available in dst
2687 * @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.
2688 * @return the number of samples written in dst or -1 if an error occurred
2690 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2694 * Compensates samplerate/timestamp drift. The compensation is done by changing
2695 * the resampler parameters, so no audible clicks or similar distortions occur
2696 * @param compensation_distance distance in output samples over which the compensation should be performed
2697 * @param sample_delta number of output samples which should be output less
2699 * example: av_resample_compensate(c, 10, 500)
2700 * here instead of 510 samples only 500 samples would be output
2702 * note, due to rounding the actual compensation might be slightly different,
2703 * especially if the compensation_distance is large and the in_rate used during init is small
2705 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2706 void av_resample_close(struct AVResampleContext *c);
2709 * Allocate memory for a picture. Call avpicture_free to free it.
2711 * @param picture the picture to be filled in
2712 * @param pix_fmt the format of the picture
2713 * @param width the width of the picture
2714 * @param height the height of the picture
2715 * @return zero if successful, a negative value if not
2717 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
2720 * Free a picture previously allocated by avpicture_alloc().
2722 * @param picture the AVPicture to be freed
2724 void avpicture_free(AVPicture *picture);
2727 * Fill in the AVPicture fields.
2728 * The fields of the given AVPicture are filled in by using the 'ptr' address
2729 * which points to the image data buffer. Depending on the specified picture
2730 * format, one or multiple image data pointers and line sizes will be set.
2731 * If a planar format is specified, several pointers will be set pointing to
2732 * the different picture planes and the line sizes of the different planes
2733 * will be stored in the lines_sizes array.
2734 * Call with ptr == NULL to get the required size for the ptr buffer.
2736 * @param picture AVPicture whose fields are to be filled in
2737 * @param ptr Buffer which will contain or contains the actual image data
2738 * @param pix_fmt The format in which the picture data is stored.
2739 * @param width the width of the image in pixels
2740 * @param height the height of the image in pixels
2741 * @return size of the image data in bytes
2743 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2744 int pix_fmt, int width, int height);
2745 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
2746 unsigned char *dest, int dest_size);
2749 * Calculate the size in bytes that a picture of the given width and height
2750 * would occupy if stored in the given picture format.
2751 * Note that this returns the size of a compact representation as generated
2752 * by avpicture_layout, which can be smaller than the size required for e.g.
2755 * @param pix_fmt the given picture format
2756 * @param width the width of the image
2757 * @param height the height of the image
2758 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
2760 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
2761 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
2762 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
2763 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2766 * Returns the pixel format corresponding to the name \p name.
2768 * If there is no pixel format with name \p name, then looks for a
2769 * pixel format with the name corresponding to the native endian
2770 * format of \p name.
2771 * For example in a little-endian system, first looks for "gray16",
2772 * then for "gray16le".
2774 * Finally if no pixel format has been found, returns \c PIX_FMT_NONE.
2776 enum PixelFormat avcodec_get_pix_fmt(const char* name);
2777 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);
2779 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
2780 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
2781 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
2782 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
2783 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
2784 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
2787 * Computes what kind of losses will occur when converting from one specific
2788 * pixel format to another.
2789 * When converting from one pixel format to another, information loss may occur.
2790 * For example, when converting from RGB24 to GRAY, the color information will
2791 * be lost. Similarly, other losses occur when converting from some formats to
2792 * other formats. These losses can involve loss of chroma, but also loss of
2793 * resolution, loss of color depth, loss due to the color space conversion, loss
2794 * of the alpha bits or loss due to color quantization.
2795 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
2796 * which will occur when converting from one pixel format to another.
2798 * @param[in] dst_pix_fmt destination pixel format
2799 * @param[in] src_pix_fmt source pixel format
2800 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2801 * @return Combination of flags informing you what kind of losses will occur.
2803 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
2807 * Finds the best pixel format to convert to given a certain source pixel
2808 * format. When converting from one pixel format to another, information loss
2809 * may occur. For example, when converting from RGB24 to GRAY, the color
2810 * information will be lost. Similarly, other losses occur when converting from
2811 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
2812 * the given pixel formats should be used to suffer the least amount of loss.
2813 * The pixel formats from which it chooses one, are determined by the
2814 * \p pix_fmt_mask parameter.
2817 * src_pix_fmt = PIX_FMT_YUV420P;
2818 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
2819 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
2822 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
2823 * @param[in] src_pix_fmt source pixel format
2824 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2825 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
2826 * @return The best pixel format to convert to or -1 if none was found.
2828 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
2829 int has_alpha, int *loss_ptr);
2833 * Print in buf the string corresponding to the pixel format with
2834 * number pix_fmt, or an header if pix_fmt is negative.
2836 * @param[in] buf the buffer where to write the string
2837 * @param[in] buf_size the size of buf
2838 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
2839 * a negative value to print the corresponding header.
2840 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
2842 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
2844 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
2845 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
2848 * Tell if an image really has transparent alpha values.
2849 * @return ored mask of FF_ALPHA_xxx constants
2851 int img_get_alpha_info(const AVPicture *src,
2852 enum PixelFormat pix_fmt, int width, int height);
2854 /* deinterlace a picture */
2855 /* deinterlace - if not supported return -1 */
2856 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
2857 enum PixelFormat pix_fmt, int width, int height);
2859 /* external high level API */
2862 * If c is NULL, returns the first registered codec,
2863 * if c is non-NULL, returns the next registered codec after c,
2864 * or NULL if c is the last one.
2866 AVCodec *av_codec_next(AVCodec *c);
2869 * Returns the LIBAVCODEC_VERSION_INT constant.
2871 unsigned avcodec_version(void);
2874 * Initializes libavcodec.
2876 * @warning This function \e must be called before any other libavcodec
2879 void avcodec_init(void);
2881 #if LIBAVCODEC_VERSION_MAJOR < 53
2883 * @deprecated Deprecated in favor of avcodec_register().
2885 attribute_deprecated void register_avcodec(AVCodec *codec);
2889 * Register the codec \p codec and initialize libavcodec.
2891 * @see avcodec_init()
2893 void avcodec_register(AVCodec *codec);
2896 * Finds a registered encoder with a matching codec ID.
2898 * @param id CodecID of the requested encoder
2899 * @return An encoder if one was found, NULL otherwise.
2901 AVCodec *avcodec_find_encoder(enum CodecID id);
2904 * Finds a registered encoder with the specified name.
2906 * @param name name of the requested encoder
2907 * @return An encoder if one was found, NULL otherwise.
2909 AVCodec *avcodec_find_encoder_by_name(const char *name);
2912 * Finds a registered decoder with a matching codec ID.
2914 * @param id CodecID of the requested decoder
2915 * @return A decoder if one was found, NULL otherwise.
2917 AVCodec *avcodec_find_decoder(enum CodecID id);
2920 * Finds a registered decoder with the specified name.
2922 * @param name name of the requested decoder
2923 * @return A decoder if one was found, NULL otherwise.
2925 AVCodec *avcodec_find_decoder_by_name(const char *name);
2926 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
2929 * Sets the fields of the given AVCodecContext to default values.
2931 * @param s The AVCodecContext of which the fields should be set to default values.
2933 void avcodec_get_context_defaults(AVCodecContext *s);
2935 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2936 * we WILL change its arguments and name a few times! */
2937 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
2940 * Allocates an AVCodecContext and sets its fields to default values. The
2941 * resulting struct can be deallocated by simply calling av_free().
2943 * @return An AVCodecContext filled with default values or NULL on failure.
2944 * @see avcodec_get_context_defaults
2946 AVCodecContext *avcodec_alloc_context(void);
2948 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2949 * we WILL change its arguments and name a few times! */
2950 AVCodecContext *avcodec_alloc_context2(enum CodecType);
2953 * Sets the fields of the given AVFrame to default values.
2955 * @param pic The AVFrame of which the fields should be set to default values.
2957 void avcodec_get_frame_defaults(AVFrame *pic);
2960 * Allocates an AVFrame and sets its fields to default values. The resulting
2961 * struct can be deallocated by simply calling av_free().
2963 * @return An AVFrame filled with default values or NULL on failure.
2964 * @see avcodec_get_frame_defaults
2966 AVFrame *avcodec_alloc_frame(void);
2968 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
2969 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
2970 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
2971 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
2974 * Checks if the given dimension of a picture is valid, meaning that all
2975 * bytes of the picture can be addressed with a signed int.
2977 * @param[in] w Width of the picture.
2978 * @param[in] h Height of the picture.
2979 * @return Zero if valid, a negative value if invalid.
2981 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
2982 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
2984 int avcodec_thread_init(AVCodecContext *s, int thread_count);
2985 void avcodec_thread_free(AVCodecContext *s);
2986 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
2987 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
2988 //FIXME func typedef
2991 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
2992 * function the context has to be allocated.
2994 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2995 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2996 * retrieving a codec.
2998 * @warning This function is not thread safe!
3001 * avcodec_register_all();
3002 * codec = avcodec_find_decoder(CODEC_ID_H264);
3006 * context = avcodec_alloc_context();
3008 * if (avcodec_open(context, codec) < 0)
3012 * @param avctx The context which will be set up to use the given codec.
3013 * @param codec The codec to use within the context.
3014 * @return zero on success, a negative value on error
3015 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3017 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3020 * Decodes an audio frame from \p buf into \p samples.
3021 * The avcodec_decode_audio2() function decodes an audio frame from the input
3022 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
3023 * audio codec which was coupled with \p avctx using avcodec_open(). The
3024 * resulting decoded frame is stored in output buffer \p samples. If no frame
3025 * could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
3026 * decompressed frame size in \e bytes.
3028 * @warning You \e must set \p frame_size_ptr to the allocated size of the
3029 * output buffer before calling avcodec_decode_audio2().
3031 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
3032 * the actual read bytes because some optimized bitstream readers read 32 or 64
3033 * bits at once and could read over the end.
3035 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
3036 * no overreading happens for damaged MPEG streams.
3038 * @note You might have to align the input buffer \p buf and output buffer \p
3039 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3040 * necessary at all, on others it won't work at all if not aligned and on others
3041 * it will work but it will have an impact on performance. In practice, the
3042 * bitstream should have 4 byte alignment at minimum and all sample data should
3043 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
3044 * the linesize is not a multiple of 16 then there's no sense in aligning the
3045 * start of the buffer to 16.
3047 * @param avctx the codec context
3048 * @param[out] samples the output buffer
3049 * @param[in,out] frame_size_ptr the output buffer size in bytes
3050 * @param[in] buf the input buffer
3051 * @param[in] buf_size the input buffer size in bytes
3052 * @return On error a negative value is returned, otherwise the number of bytes
3053 * used or zero if no frame could be decompressed.
3055 int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3056 int *frame_size_ptr,
3057 const uint8_t *buf, int buf_size);
3060 * Decodes a video frame from \p buf into \p picture.
3061 * The avcodec_decode_video() function decodes a video frame from the input
3062 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
3063 * video codec which was coupled with \p avctx using avcodec_open(). The
3064 * resulting decoded frame is stored in \p picture.
3066 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
3067 * the actual read bytes because some optimized bitstream readers read 32 or 64
3068 * bits at once and could read over the end.
3070 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
3071 * no overreading happens for damaged MPEG streams.
3073 * @note You might have to align the input buffer \p buf and output buffer \p
3074 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
3075 * necessary at all, on others it won't work at all if not aligned and on others
3076 * it will work but it will have an impact on performance. In practice, the
3077 * bitstream should have 4 byte alignment at minimum and all sample data should
3078 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
3079 * the linesize is not a multiple of 16 then there's no sense in aligning the
3080 * start of the buffer to 16.
3082 * @note Some codecs have a delay between input and output, these need to be
3083 * feeded with buf=NULL, buf_size=0 at the end to return the remaining frames.
3085 * @param avctx the codec context
3086 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3087 * @param[in] buf the input buffer
3088 * @param[in] buf_size the size of the input buffer in bytes
3089 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3090 * @return On error a negative value is returned, otherwise the number of bytes
3091 * used or zero if no frame could be decompressed.
3093 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3094 int *got_picture_ptr,
3095 const uint8_t *buf, int buf_size);
3097 /* Decode a subtitle message. Return -1 if error, otherwise return the
3098 * number of bytes used. If no subtitle could be decompressed,
3099 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3100 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3102 const uint8_t *buf, int buf_size);
3103 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3105 uint8_t *buf, int buf_size);
3108 * Encodes an audio frame from \p samples into \p buf.
3109 * The avcodec_encode_audio() function encodes an audio frame from the input
3110 * buffer \p samples. To encode it, it makes use of the audio codec which was
3111 * coupled with \p avctx using avcodec_open(). The resulting encoded frame is
3112 * stored in output buffer \p buf.
3114 * @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
3116 * @param avctx the codec context
3117 * @param[out] buf the output buffer
3118 * @param[in] buf_size the output buffer size
3119 * @param[in] samples the input buffer containing the samples
3120 * The number of samples read from this buffer is frame_size*channels,
3121 * both of which are defined in \p avctx.
3122 * For PCM audio the number of samples read from \p samples is equal to
3123 * \p buf_size * input_sample_size / output_sample_size.
3124 * @return On error a negative value is returned, on success zero or the number
3125 * of bytes used to encode the data read from the input buffer.
3127 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3128 const short *samples);
3131 * Encodes a video frame from \p pict into \p buf.
3132 * The avcodec_encode_video() function encodes a video frame from the input
3133 * \p pict. To encode it, it makes use of the video codec which was coupled with
3134 * \p avctx using avcodec_open(). The resulting encoded bytes representing the
3135 * frame are stored in the output buffer \p buf. The input picture should be
3136 * stored using a specific format, namely \c avctx.pix_fmt.
3138 * @param avctx the codec context
3139 * @param[out] buf the output buffer for the bitstream of encoded frame
3140 * @param[in] buf_size the size of the output buffer in bytes
3141 * @param[in] pict the input picture to encode
3142 * @return On error a negative value is returned, on success zero or the number
3143 * of bytes used from the output buffer.
3145 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3146 const AVFrame *pict);
3147 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3148 const AVSubtitle *sub);
3150 int avcodec_close(AVCodecContext *avctx);
3153 * Register all the codecs, parsers and bitstream filters which were enabled at
3154 * configuration time. If you do not call this function you can select exactly
3155 * which formats you want to support, by using the individual registration
3158 * @see avcodec_register
3159 * @see av_register_codec_parser
3160 * @see av_register_bitstream_filter
3162 void avcodec_register_all(void);
3165 * Flush buffers, should be called when seeking or when switching to a different stream.
3167 void avcodec_flush_buffers(AVCodecContext *avctx);
3169 void avcodec_default_free_buffers(AVCodecContext *s);
3171 /* misc useful functions */
3174 * Returns a single letter to describe the given picture type \p pict_type.
3176 * @param[in] pict_type the picture type
3177 * @return A single character representing the picture type.
3179 char av_get_pict_type_char(int pict_type);
3182 * Returns codec bits per sample.
3184 * @param[in] codec_id the codec
3185 * @return Number of bits per sample or zero if unknown for the given codec.
3187 int av_get_bits_per_sample(enum CodecID codec_id);
3190 * Returns sample format bits per sample.
3192 * @param[in] sample_fmt the sample format
3193 * @return Number of bits per sample or zero if unknown for the given sample format.
3195 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3198 typedef struct AVCodecParserContext {
3200 struct AVCodecParser *parser;
3201 int64_t frame_offset; /* offset of the current frame */
3202 int64_t cur_offset; /* current offset
3203 (incremented by each av_parser_parse()) */
3204 int64_t next_frame_offset; /* offset of the next frame */
3206 int pict_type; /* XXX: Put it back in AVCodecContext. */
3208 * This field is used for proper frame duration computation in lavf.
3209 * It signals, how much longer the frame duration of the current frame
3210 * is compared to normal frame duration.
3212 * frame_duration = (1 + repeat_pict) * time_base
3214 * It is used by codecs like H.264 to display telecined material.
3216 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3217 int64_t pts; /* pts of the current frame */
3218 int64_t dts; /* dts of the current frame */
3223 int fetch_timestamp;
3225 #define AV_PARSER_PTS_NB 4
3226 int cur_frame_start_index;
3227 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3228 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3229 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3232 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3234 int64_t offset; ///< byte offset from starting packet start
3235 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3238 * Set by parser to 1 for key frames and 0 for non-key frames.
3239 * It is initialized to -1, so if the parser doesn't set this flag,
3240 * old-style fallback using FF_I_TYPE picture type as key frames
3246 * Time difference in stream time base units from the pts of this
3247 * packet to the point at which the output from the decoder has converged
3248 * independent from the availability of previous frames. That is, the
3249 * frames are virtually identical no matter if decoding started from
3250 * the very first frame or from this keyframe.
3251 * Is AV_NOPTS_VALUE if unknown.
3252 * This field is not the display duration of the current frame.
3254 * The purpose of this field is to allow seeking in streams that have no
3255 * keyframes in the conventional sense. It corresponds to the
3256 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3257 * essential for some types of subtitle streams to ensure that all
3258 * subtitles are correctly displayed after seeking.
3260 int64_t convergence_duration;
3262 // Timestamp generation support:
3264 * Synchronization point for start of timestamp generation.
3266 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3269 * For example, this corresponds to presence of H.264 buffering period
3275 * Offset of the current timestamp against last timestamp sync point in
3276 * units of AVCodecContext.time_base.
3278 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3279 * contain a valid timestamp offset.
3281 * Note that the timestamp of sync point has usually a nonzero
3282 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3283 * the next frame after timestamp sync point will be usually 1.
3285 * For example, this corresponds to H.264 cpb_removal_delay.
3287 int dts_ref_dts_delta;
3290 * Presentation delay of current frame in units of AVCodecContext.time_base.
3292 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3293 * contain valid non-negative timestamp delta (presentation time of a frame
3294 * must not lie in the past).
3296 * This delay represents the difference between decoding and presentation
3297 * time of the frame.
3299 * For example, this corresponds to H.264 dpb_output_delay.
3304 * Position of the packet in file.
3306 * Analogous to cur_frame_pts/dts
3308 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3311 * Byte position of currently parsed frame in stream.
3316 * Previous frame byte position.
3319 } AVCodecParserContext;
3321 typedef struct AVCodecParser {
3322 int codec_ids[5]; /* several codec IDs are permitted */
3324 int (*parser_init)(AVCodecParserContext *s);
3325 int (*parser_parse)(AVCodecParserContext *s,
3326 AVCodecContext *avctx,
3327 const uint8_t **poutbuf, int *poutbuf_size,
3328 const uint8_t *buf, int buf_size);
3329 void (*parser_close)(AVCodecParserContext *s);
3330 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3331 struct AVCodecParser *next;
3334 AVCodecParser *av_parser_next(AVCodecParser *c);
3336 void av_register_codec_parser(AVCodecParser *parser);
3337 AVCodecParserContext *av_parser_init(int codec_id);
3339 #if LIBAVCODEC_VERSION_MAJOR < 53
3340 attribute_deprecated
3341 int av_parser_parse(AVCodecParserContext *s,
3342 AVCodecContext *avctx,
3343 uint8_t **poutbuf, int *poutbuf_size,
3344 const uint8_t *buf, int buf_size,
3345 int64_t pts, int64_t dts);
3351 * @param s parser context.
3352 * @param avctx codec context.
3353 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3354 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3355 * @param buf input buffer.
3356 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3357 * @param pts input presentation timestamp.
3358 * @param dts input decoding timestamp.
3359 * @param pos input byte position in stream.
3360 * @return the number of bytes of the input bitstream used.
3365 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3372 * decode_frame(data, size);
3376 int av_parser_parse2(AVCodecParserContext *s,
3377 AVCodecContext *avctx,
3378 uint8_t **poutbuf, int *poutbuf_size,
3379 const uint8_t *buf, int buf_size,
3380 int64_t pts, int64_t dts,
3383 int av_parser_change(AVCodecParserContext *s,
3384 AVCodecContext *avctx,
3385 uint8_t **poutbuf, int *poutbuf_size,
3386 const uint8_t *buf, int buf_size, int keyframe);
3387 void av_parser_close(AVCodecParserContext *s);
3390 typedef struct AVBitStreamFilterContext {
3392 struct AVBitStreamFilter *filter;
3393 AVCodecParserContext *parser;
3394 struct AVBitStreamFilterContext *next;
3395 } AVBitStreamFilterContext;
3398 typedef struct AVBitStreamFilter {
3401 int (*filter)(AVBitStreamFilterContext *bsfc,
3402 AVCodecContext *avctx, const char *args,
3403 uint8_t **poutbuf, int *poutbuf_size,
3404 const uint8_t *buf, int buf_size, int keyframe);
3405 void (*close)(AVBitStreamFilterContext *bsfc);
3406 struct AVBitStreamFilter *next;
3407 } AVBitStreamFilter;
3409 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3410 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3411 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3412 AVCodecContext *avctx, const char *args,
3413 uint8_t **poutbuf, int *poutbuf_size,
3414 const uint8_t *buf, int buf_size, int keyframe);
3415 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3417 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3422 * Reallocates the given block if it is not large enough, otherwise it
3427 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3430 * Copy image 'src' to 'dst'.
3432 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3433 enum PixelFormat pix_fmt, int width, int height);
3436 * Crop image top and left side.
3438 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3439 enum PixelFormat pix_fmt, int top_band, int left_band);
3444 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
3445 int padtop, int padbottom, int padleft, int padright, int *color);
3447 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
3450 * Parses \p str and put in \p width_ptr and \p height_ptr the detected values.
3452 * @return 0 in case of a successful parsing, a negative value otherwise
3453 * @param[in] str the string to parse: it has to be a string in the format
3454 * <width>x<height> or a valid video frame size abbreviation.
3455 * @param[in,out] width_ptr pointer to the variable which will contain the detected
3457 * @param[in,out] height_ptr pointer to the variable which will contain the detected
3458 * frame height value
3460 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
3463 * Parses \p str and put in \p frame_rate the detected values.
3465 * @return 0 in case of a successful parsing, a negative value otherwise
3466 * @param[in] str the string to parse: it has to be a string in the format
3467 * <frame_rate_num>/<frame_rate_den>, a float number or a valid video rate abbreviation
3468 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
3471 int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
3473 /* error handling */
3475 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
3476 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
3478 /* Some platforms have E* and errno already negated. */
3479 #define AVERROR(e) (e)
3480 #define AVUNERROR(e) (e)
3482 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
3483 #define AVERROR_IO AVERROR(EIO) /**< I/O error */
3484 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< Number syntax expected in filename. */
3485 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
3486 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
3487 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
3488 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< Operation not supported. */
3489 #define AVERROR_NOENT AVERROR(ENOENT) /**< No such file or directory. */
3490 #define AVERROR_EOF AVERROR(EPIPE) /**< End of file. */
3491 #define AVERROR_PATCHWELCOME -MKTAG('P','A','W','E') /**< Not yet implemented in FFmpeg. Patches welcome. */
3494 * Registers the hardware accelerator \p hwaccel.
3496 void av_register_hwaccel(AVHWAccel *hwaccel);
3499 * If hwaccel is NULL, returns the first registered hardware accelerator,
3500 * if hwaccel is non-NULL, returns the next registered hardware accelerator
3501 * after hwaccel, or NULL if hwaccel is the last one.
3503 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
3505 #endif /* AVCODEC_AVCODEC_H */