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 22
34 #define LIBAVCODEC_VERSION_MICRO 3
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_IWMMXT 0x0100 ///< XScale IWMMXT
1466 #define FF_MM_ALTIVEC 0x0001 ///< standard AltiVec
1469 * bits per sample/pixel from the demuxer (needed for huffyuv).
1470 * - encoding: Set by libavcodec.
1471 * - decoding: Set by user.
1473 int bits_per_coded_sample
;
1476 * prediction method (needed for huffyuv)
1477 * - encoding: Set by user.
1478 * - decoding: unused
1480 int prediction_method
;
1481 #define FF_PRED_LEFT 0
1482 #define FF_PRED_PLANE 1
1483 #define FF_PRED_MEDIAN 2
1486 * sample aspect ratio (0 if unknown)
1487 * That is the width of a pixel divided by the height of the pixel.
1488 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1489 * - encoding: Set by user.
1490 * - decoding: Set by libavcodec.
1492 AVRational sample_aspect_ratio
;
1495 * the picture in the bitstream
1496 * - encoding: Set by libavcodec.
1497 * - decoding: Set by libavcodec.
1499 AVFrame
*coded_frame
;
1503 * - encoding: Set by user.
1504 * - decoding: Set by user.
1507 #define FF_DEBUG_PICT_INFO 1
1508 #define FF_DEBUG_RC 2
1509 #define FF_DEBUG_BITSTREAM 4
1510 #define FF_DEBUG_MB_TYPE 8
1511 #define FF_DEBUG_QP 16
1512 #define FF_DEBUG_MV 32
1513 #define FF_DEBUG_DCT_COEFF 0x00000040
1514 #define FF_DEBUG_SKIP 0x00000080
1515 #define FF_DEBUG_STARTCODE 0x00000100
1516 #define FF_DEBUG_PTS 0x00000200
1517 #define FF_DEBUG_ER 0x00000400
1518 #define FF_DEBUG_MMCO 0x00000800
1519 #define FF_DEBUG_BUGS 0x00001000
1520 #define FF_DEBUG_VIS_QP 0x00002000
1521 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1522 #define FF_DEBUG_BUFFERS 0x00008000
1526 * - encoding: Set by user.
1527 * - decoding: Set by user.
1530 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1531 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1532 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1536 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1537 * - decoding: unused
1542 * minimum MB quantizer
1543 * - encoding: unused
1544 * - decoding: unused
1549 * maximum MB quantizer
1550 * - encoding: unused
1551 * - decoding: unused
1556 * motion estimation comparison function
1557 * - encoding: Set by user.
1558 * - decoding: unused
1562 * subpixel motion estimation comparison function
1563 * - encoding: Set by user.
1564 * - decoding: unused
1568 * macroblock comparison function (not supported yet)
1569 * - encoding: Set by user.
1570 * - decoding: unused
1574 * interlaced DCT comparison function
1575 * - encoding: Set by user.
1576 * - decoding: unused
1579 #define FF_CMP_SAD 0
1580 #define FF_CMP_SSE 1
1581 #define FF_CMP_SATD 2
1582 #define FF_CMP_DCT 3
1583 #define FF_CMP_PSNR 4
1584 #define FF_CMP_BIT 5
1586 #define FF_CMP_ZERO 7
1587 #define FF_CMP_VSAD 8
1588 #define FF_CMP_VSSE 9
1589 #define FF_CMP_NSSE 10
1590 #define FF_CMP_W53 11
1591 #define FF_CMP_W97 12
1592 #define FF_CMP_DCTMAX 13
1593 #define FF_CMP_DCT264 14
1594 #define FF_CMP_CHROMA 256
1597 * ME diamond size & shape
1598 * - encoding: Set by user.
1599 * - decoding: unused
1604 * amount of previous MV predictors (2a+1 x 2a+1 square)
1605 * - encoding: Set by user.
1606 * - decoding: unused
1608 int last_predictor_count
;
1611 * prepass for motion estimation
1612 * - encoding: Set by user.
1613 * - decoding: unused
1618 * motion estimation prepass comparison function
1619 * - encoding: Set by user.
1620 * - decoding: unused
1625 * ME prepass diamond size & shape
1626 * - encoding: Set by user.
1627 * - decoding: unused
1633 * - encoding: Set by user.
1634 * - decoding: unused
1636 int me_subpel_quality
;
1639 * callback to negotiate the pixelFormat
1640 * @param fmt is the list of formats which are supported by the codec,
1641 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1642 * The first is always the native one.
1643 * @return the chosen format
1644 * - encoding: unused
1645 * - decoding: Set by user, if not set the native format will be chosen.
1647 enum PixelFormat (*get_format
)(struct AVCodecContext
*s
, const enum PixelFormat
* fmt
);
1650 * DTG active format information (additional aspect ratio
1651 * information only used in DVB MPEG-2 transport streams)
1654 * - encoding: unused
1655 * - decoding: Set by decoder.
1657 int dtg_active_format
;
1658 #define FF_DTG_AFD_SAME 8
1659 #define FF_DTG_AFD_4_3 9
1660 #define FF_DTG_AFD_16_9 10
1661 #define FF_DTG_AFD_14_9 11
1662 #define FF_DTG_AFD_4_3_SP_14_9 13
1663 #define FF_DTG_AFD_16_9_SP_14_9 14
1664 #define FF_DTG_AFD_SP_4_3 15
1667 * maximum motion estimation search range in subpel units
1668 * If 0 then no limit.
1670 * - encoding: Set by user.
1671 * - decoding: unused
1676 * intra quantizer bias
1677 * - encoding: Set by user.
1678 * - decoding: unused
1680 int intra_quant_bias
;
1681 #define FF_DEFAULT_QUANT_BIAS 999999
1684 * inter quantizer bias
1685 * - encoding: Set by user.
1686 * - decoding: unused
1688 int inter_quant_bias
;
1692 * - encoding: unused
1693 * - decoding: Which clrtable should be used for 8bit RGB images.
1694 * Tables have to be stored somewhere. FIXME
1699 * internal_buffer count
1700 * Don't touch, used by libavcodec default_get_buffer().
1702 int internal_buffer_count
;
1706 * Don't touch, used by libavcodec default_get_buffer().
1708 void *internal_buffer
;
1710 #define FF_LAMBDA_SHIFT 7
1711 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1712 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1713 #define FF_LAMBDA_MAX (256*128-1)
1715 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1717 * Global quality for codecs which cannot change it per frame.
1718 * This should be proportional to MPEG-1/2/4 qscale.
1719 * - encoding: Set by user.
1720 * - decoding: unused
1724 #define FF_CODER_TYPE_VLC 0
1725 #define FF_CODER_TYPE_AC 1
1726 #define FF_CODER_TYPE_RAW 2
1727 #define FF_CODER_TYPE_RLE 3
1728 #define FF_CODER_TYPE_DEFLATE 4
1731 * - encoding: Set by user.
1732 * - decoding: unused
1738 * - encoding: Set by user.
1739 * - decoding: unused
1745 * - encoding: unused
1746 * - decoding: Set by user.
1748 uint8_t * (*realloc
)(struct AVCodecContext
*s
, uint8_t *buf
, int buf_size
);
1753 * - encoding: unused
1754 * - decoding: Set by user.
1757 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1758 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1759 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1762 * XVideo Motion Acceleration
1763 * - encoding: forbidden
1764 * - decoding: set by decoder
1766 int xvmc_acceleration
;
1769 * macroblock decision mode
1770 * - encoding: Set by user.
1771 * - decoding: unused
1774 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1775 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1776 #define FF_MB_DECISION_RD 2 ///< rate distortion
1779 * custom intra quantization matrix
1780 * - encoding: Set by user, can be NULL.
1781 * - decoding: Set by libavcodec.
1783 uint16_t *intra_matrix
;
1786 * custom inter quantization matrix
1787 * - encoding: Set by user, can be NULL.
1788 * - decoding: Set by libavcodec.
1790 uint16_t *inter_matrix
;
1793 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1794 * This is used to work around some encoder bugs.
1795 * - encoding: unused
1796 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1798 unsigned int stream_codec_tag
;
1801 * scene change detection threshold
1802 * 0 is default, larger means fewer detected scene changes.
1803 * - encoding: Set by user.
1804 * - decoding: unused
1806 int scenechange_threshold
;
1809 * minimum Lagrange multipler
1810 * - encoding: Set by user.
1811 * - decoding: unused
1816 * maximum Lagrange multipler
1817 * - encoding: Set by user.
1818 * - decoding: unused
1823 * palette control structure
1824 * - encoding: ??? (no palette-enabled encoder yet)
1825 * - decoding: Set by user.
1827 struct AVPaletteControl
*palctrl
;
1830 * noise reduction strength
1831 * - encoding: Set by user.
1832 * - decoding: unused
1834 int noise_reduction
;
1837 * Called at the beginning of a frame to get cr buffer for it.
1838 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1839 * libavcodec will pass previous buffer in pic, function should return
1840 * same buffer or new buffer with old frame "painted" into it.
1841 * If pic.data[0] == NULL must behave like get_buffer().
1842 * - encoding: unused
1843 * - decoding: Set by libavcodec., user can override
1845 int (*reget_buffer
)(struct AVCodecContext
*c
, AVFrame
*pic
);
1848 * Number of bits which should be loaded into the rc buffer before decoding starts.
1849 * - encoding: Set by user.
1850 * - decoding: unused
1852 int rc_initial_buffer_occupancy
;
1856 * - encoding: Set by user.
1857 * - decoding: unused
1859 int inter_threshold
;
1863 * - encoding: Set by user.
1864 * - decoding: Set by user.
1869 * Simulates errors in the bitstream to test error concealment.
1870 * - encoding: Set by user.
1871 * - decoding: unused
1876 * MP3 antialias algorithm, see FF_AA_* below.
1877 * - encoding: unused
1878 * - decoding: Set by user.
1881 #define FF_AA_AUTO 0
1882 #define FF_AA_FASTINT 1 //not implemented yet
1884 #define FF_AA_FLOAT 3
1886 * quantizer noise shaping
1887 * - encoding: Set by user.
1888 * - decoding: unused
1890 int quantizer_noise_shaping
;
1894 * is used to decide how many independent tasks should be passed to execute()
1895 * - encoding: Set by user.
1896 * - decoding: Set by user.
1901 * The codec may call this to execute several independent things.
1902 * It will return only after finishing all tasks.
1903 * The user may replace this with some multithreaded implementation,
1904 * the default implementation will execute the parts serially.
1905 * @param count the number of things to execute
1906 * - encoding: Set by libavcodec, user can override.
1907 * - decoding: Set by libavcodec, user can override.
1909 int (*execute
)(struct AVCodecContext
*c
, int (*func
)(struct AVCodecContext
*c2
, void *arg
), void *arg2
, int *ret
, int count
, int size
);
1913 * Can be used by execute() to store some per AVCodecContext stuff.
1914 * - encoding: set by execute()
1915 * - decoding: set by execute()
1917 void *thread_opaque
;
1920 * Motion estimation threshold below which no motion estimation is
1921 * performed, but instead the user specified motion vectors are used.
1923 * - encoding: Set by user.
1924 * - decoding: unused
1929 * Macroblock threshold below which the user specified macroblock types will be used.
1930 * - encoding: Set by user.
1931 * - decoding: unused
1936 * precision of the intra DC coefficient - 8
1937 * - encoding: Set by user.
1938 * - decoding: unused
1940 int intra_dc_precision
;
1943 * noise vs. sse weight for the nsse comparsion function
1944 * - encoding: Set by user.
1945 * - decoding: unused
1950 * Number of macroblock rows at the top which are skipped.
1951 * - encoding: unused
1952 * - decoding: Set by user.
1957 * Number of macroblock rows at the bottom which are skipped.
1958 * - encoding: unused
1959 * - decoding: Set by user.
1965 * - encoding: Set by user.
1966 * - decoding: Set by libavcodec.
1969 #define FF_PROFILE_UNKNOWN -99
1970 #define FF_PROFILE_AAC_MAIN 0
1971 #define FF_PROFILE_AAC_LOW 1
1972 #define FF_PROFILE_AAC_SSR 2
1973 #define FF_PROFILE_AAC_LTP 3
1977 * - encoding: Set by user.
1978 * - decoding: Set by libavcodec.
1981 #define FF_LEVEL_UNKNOWN -99
1984 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1985 * - encoding: unused
1986 * - decoding: Set by user.
1991 * Bitstream width / height, may be different from width/height if lowres
1992 * or other things are used.
1993 * - encoding: unused
1994 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1996 int coded_width
, coded_height
;
1999 * frame skip threshold
2000 * - encoding: Set by user.
2001 * - decoding: unused
2003 int frame_skip_threshold
;
2007 * - encoding: Set by user.
2008 * - decoding: unused
2010 int frame_skip_factor
;
2013 * frame skip exponent
2014 * - encoding: Set by user.
2015 * - decoding: unused
2020 * frame skip comparison function
2021 * - encoding: Set by user.
2022 * - decoding: unused
2027 * Border processing masking, raises the quantizer for mbs on the borders
2029 * - encoding: Set by user.
2030 * - decoding: unused
2032 float border_masking
;
2035 * minimum MB lagrange multipler
2036 * - encoding: Set by user.
2037 * - decoding: unused
2042 * maximum MB lagrange multipler
2043 * - encoding: Set by user.
2044 * - decoding: unused
2050 * - encoding: Set by user.
2051 * - decoding: unused
2053 int me_penalty_compensation
;
2057 * - encoding: unused
2058 * - decoding: Set by user.
2060 enum AVDiscard skip_loop_filter
;
2064 * - encoding: unused
2065 * - decoding: Set by user.
2067 enum AVDiscard skip_idct
;
2071 * - encoding: unused
2072 * - decoding: Set by user.
2074 enum AVDiscard skip_frame
;
2078 * - encoding: Set by user.
2079 * - decoding: unused
2085 * - encoding: Set by user.
2086 * - decoding: unused
2091 * constant rate factor - quality-based VBR - values ~correspond to qps
2092 * - encoding: Set by user.
2093 * - decoding: unused
2098 * constant quantization parameter rate control method
2099 * - encoding: Set by user.
2100 * - decoding: unused
2106 * - encoding: Set by user.
2107 * - decoding: unused
2112 * number of reference frames
2113 * - encoding: Set by user.
2114 * - decoding: Set by lavc.
2119 * chroma qp offset from luma
2120 * - encoding: Set by user.
2121 * - decoding: unused
2126 * Influences how often B-frames are used.
2127 * - encoding: Set by user.
2128 * - decoding: unused
2133 * trellis RD quantization
2134 * - encoding: Set by user.
2135 * - decoding: unused
2140 * Reduce fluctuations in qp (before curve compression).
2141 * - encoding: Set by user.
2142 * - decoding: unused
2144 float complexityblur
;
2147 * in-loop deblocking filter alphac0 parameter
2148 * alpha is in the range -6...6
2149 * - encoding: Set by user.
2150 * - decoding: unused
2155 * in-loop deblocking filter beta parameter
2156 * beta is in the range -6...6
2157 * - encoding: Set by user.
2158 * - decoding: unused
2163 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2164 * - encoding: Set by user.
2165 * - decoding: unused
2168 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2169 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2170 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2171 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2172 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2175 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2176 * - encoding: Set by user.
2177 * - decoding: unused
2182 * Audio cutoff bandwidth (0 means "automatic")
2183 * - encoding: Set by user.
2184 * - decoding: unused
2189 * Multiplied by qscale for each frame and added to scene_change_score.
2190 * - encoding: Set by user.
2191 * - decoding: unused
2193 int scenechange_factor
;
2197 * Note: Value depends upon the compare function used for fullpel ME.
2198 * - encoding: Set by user.
2199 * - decoding: unused
2204 * Adjusts sensitivity of b_frame_strategy 1.
2205 * - encoding: Set by user.
2206 * - decoding: unused
2211 * - encoding: Set by user.
2212 * - decoding: unused
2214 int compression_level
;
2215 #define FF_COMPRESSION_DEFAULT -1
2218 * Sets whether to use LPC mode - used by FLAC encoder.
2219 * - encoding: Set by user.
2220 * - decoding: unused
2225 * LPC coefficient precision - used by FLAC encoder
2226 * - encoding: Set by user.
2227 * - decoding: unused
2229 int lpc_coeff_precision
;
2232 * - encoding: Set by user.
2233 * - decoding: unused
2235 int min_prediction_order
;
2238 * - encoding: Set by user.
2239 * - decoding: unused
2241 int max_prediction_order
;
2244 * search method for selecting prediction order
2245 * - encoding: Set by user.
2246 * - decoding: unused
2248 int prediction_order_method
;
2251 * - encoding: Set by user.
2252 * - decoding: unused
2254 int min_partition_order
;
2257 * - encoding: Set by user.
2258 * - decoding: unused
2260 int max_partition_order
;
2263 * GOP timecode frame start number, in non drop frame format
2264 * - encoding: Set by user.
2265 * - decoding: unused
2267 int64_t timecode_frame_start
;
2269 #if LIBAVCODEC_VERSION_MAJOR < 53
2271 * Decoder should decode to this many channels if it can (0 for default)
2272 * - encoding: unused
2273 * - decoding: Set by user.
2274 * @deprecated Deprecated in favor of request_channel_layout.
2276 int request_channels
;
2280 * Percentage of dynamic range compression to be applied by the decoder.
2281 * The default value is 1.0, corresponding to full compression.
2282 * - encoding: unused
2283 * - decoding: Set by user.
2288 * opaque 64bit number (generally a PTS) that will be reordered and
2289 * output in AVFrame.reordered_opaque
2290 * - encoding: unused
2291 * - decoding: Set by user.
2293 int64_t reordered_opaque
;
2296 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2297 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2298 * - encoding: set by user.
2299 * - decoding: set by libavcodec.
2301 int bits_per_raw_sample
;
2304 * Audio channel layout.
2305 * - encoding: set by user.
2306 * - decoding: set by libavcodec.
2308 int64_t channel_layout
;
2311 * Request decoder to use this channel layout if it can (0 for default)
2312 * - encoding: unused
2313 * - decoding: Set by user.
2315 int64_t request_channel_layout
;
2318 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2319 * - encoding: Set by user.
2320 * - decoding: unused.
2322 float rc_max_available_vbv_use
;
2325 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2326 * - encoding: Set by user.
2327 * - decoding: unused.
2329 float rc_min_vbv_overflow_use
;
2332 * Hardware accelerator in use
2333 * - encoding: unused.
2334 * - decoding: Set by libavcodec
2336 struct AVHWAccel
*hwaccel
;
2339 * For some codecs, the time base is closer to the field rate than the frame rate.
2340 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2341 * if no telecine is used ...
2343 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2345 int ticks_per_frame
;
2348 * Hardware accelerator context.
2349 * For some hardware accelerators, a global context needs to be
2350 * provided by the user. In that case, this holds display-dependent
2351 * data FFmpeg cannot instantiate itself. Please refer to the
2352 * FFmpeg HW accelerator documentation to know how to fill this
2353 * is. e.g. for VA API, this is a struct vaapi_context.
2354 * - encoding: unused
2355 * - decoding: Set by user
2357 void *hwaccel_context
;
2363 typedef struct AVCodec
{
2365 * Name of the codec implementation.
2366 * The name is globally unique among encoders and among decoders (but an
2367 * encoder and a decoder can share the same name).
2368 * This is the primary way to find a codec from the user perspective.
2371 enum CodecType type
;
2374 int (*init
)(AVCodecContext
*);
2375 int (*encode
)(AVCodecContext
*, uint8_t *buf
, int buf_size
, void *data
);
2376 int (*close
)(AVCodecContext
*);
2377 int (*decode
)(AVCodecContext
*, void *outdata
, int *outdata_size
,
2378 const uint8_t *buf
, int buf_size
);
2380 * Codec capabilities.
2384 struct AVCodec
*next
;
2387 * Will be called when seeking
2389 void (*flush
)(AVCodecContext
*);
2390 const AVRational
*supported_framerates
; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2391 const enum PixelFormat
*pix_fmts
; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2393 * Descriptive name for the codec, meant to be more human readable than \p name.
2394 * You \e should use the NULL_IF_CONFIG_SMALL() macro to define it.
2396 const char *long_name
;
2397 const int *supported_samplerates
; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2398 const enum SampleFormat
*sample_fmts
; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2399 const int64_t *channel_layouts
; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2405 typedef struct AVHWAccel
{
2407 * Name of the hardware accelerated codec.
2408 * The name is globally unique among encoders and among decoders (but an
2409 * encoder and a decoder can share the same name).
2414 * Type of codec implemented by the hardware accelerator.
2416 * See CODEC_TYPE_xxx
2418 enum CodecType type
;
2421 * Codec implemented by the hardware accelerator.
2428 * Supported pixel format.
2430 * Only hardware accelerated formats are supported here.
2432 enum PixelFormat pix_fmt
;
2435 * Hardware accelerated codec capabilities.
2436 * see FF_HWACCEL_CODEC_CAP_*
2440 struct AVHWAccel
*next
;
2443 * Called at the beginning of each frame or field picture.
2445 * Meaningful frame information (codec specific) is guaranteed to
2446 * be parsed at this point. This function is mandatory.
2448 * Note that \p buf can be NULL along with \p buf_size set to 0.
2449 * Otherwise, this means the whole frame is available at this point.
2451 * @param avctx the codec context
2452 * @param buf the frame data buffer base
2453 * @param buf_size the size of the frame in bytes
2454 * @return zero if successful, a negative value otherwise
2456 int (*start_frame
)(AVCodecContext
*avctx
, const uint8_t *buf
, uint32_t buf_size
);
2459 * Callback for each slice.
2461 * Meaningful slice information (codec specific) is guaranteed to
2462 * be parsed at this point. This function is mandatory.
2464 * @param avctx the codec context
2465 * @param buf the slice data buffer base
2466 * @param buf_size the size of the slice in bytes
2467 * @return zero if successful, a negative value otherwise
2469 int (*decode_slice
)(AVCodecContext
*avctx
, const uint8_t *buf
, uint32_t buf_size
);
2472 * Called at the end of each frame or field picture.
2474 * The whole picture is parsed at this point and can now be sent
2475 * to the hardware accelerator. This function is mandatory.
2477 * @param avctx the codec context
2478 * @return zero if successful, a negative value otherwise
2480 int (*end_frame
)(AVCodecContext
*avctx
);
2483 * Size of HW accelerator private data.
2485 * Private data is allocated with av_mallocz() before
2486 * AVCodecContext.get_buffer() and deallocated after
2487 * AVCodecContext.release_buffer().
2493 * four components are given, that's all.
2494 * the last component is alpha
2496 typedef struct AVPicture
{
2498 int linesize
[4]; ///< number of bytes per line
2501 #if LIBAVCODEC_VERSION_MAJOR < 53
2504 * This structure defines a method for communicating palette changes
2505 * between and demuxer and a decoder.
2507 * @deprecated Use AVPacket to send palette changes instead.
2508 * This is totally broken.
2510 #define AVPALETTE_SIZE 1024
2511 #define AVPALETTE_COUNT 256
2512 typedef struct AVPaletteControl
{
2514 /* Demuxer sets this to 1 to indicate the palette has changed;
2515 * decoder resets to 0. */
2516 int palette_changed
;
2518 /* 4-byte ARGB palette entries, stored in native byte order; note that
2519 * the individual palette components should be on a 8-bit scale; if
2520 * the palette data comes from an IBM VGA native format, the component
2521 * data is probably 6 bits in size and needs to be scaled. */
2522 unsigned int palette
[AVPALETTE_COUNT
];
2524 } AVPaletteControl attribute_deprecated
;
2527 enum AVSubtitleType
{
2530 SUBTITLE_BITMAP
, ///< A bitmap, pict will be set
2533 * Plain text, the text field must be set by the decoder and is
2534 * authoritative. ass and pict fields may contain approximations.
2539 * Formatted text, the ass field must be set by the decoder and is
2540 * authoritative. pict and text fields may contain approximations.
2545 typedef struct AVSubtitleRect
{
2546 int x
; ///< top left corner of pict, undefined when pict is not set
2547 int y
; ///< top left corner of pict, undefined when pict is not set
2548 int w
; ///< width of pict, undefined when pict is not set
2549 int h
; ///< height of pict, undefined when pict is not set
2550 int nb_colors
; ///< number of colors in pict, undefined when pict is not set
2553 * data+linesize for the bitmap of this subtitle.
2554 * can be set for text/ass as well once they where rendered
2557 enum AVSubtitleType type
;
2559 char *text
; ///< 0 terminated plain UTF-8 text
2562 * 0 terminated ASS/SSA compatible event line.
2563 * The pressentation of this is unaffected by the other values in this
2569 typedef struct AVSubtitle
{
2570 uint16_t format
; /* 0 = graphics */
2571 uint32_t start_display_time
; /* relative to packet pts, in ms */
2572 uint32_t end_display_time
; /* relative to packet pts, in ms */
2574 AVSubtitleRect
**rects
;
2580 struct ReSampleContext
;
2581 struct AVResampleContext
;
2583 typedef struct ReSampleContext ReSampleContext
;
2585 #if LIBAVCODEC_VERSION_MAJOR < 53
2587 * @deprecated Use av_audio_resample_init() instead.
2589 attribute_deprecated ReSampleContext
*audio_resample_init(int output_channels
, int input_channels
,
2590 int output_rate
, int input_rate
);
2593 * Initializes audio resampling context
2595 * @param output_channels number of output channels
2596 * @param input_channels number of input channels
2597 * @param output_rate output sample rate
2598 * @param input_rate input sample rate
2599 * @param sample_fmt_out requested output sample format
2600 * @param sample_fmt_in input sample format
2601 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2602 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2603 * @param linear If 1 then the used FIR filter will be linearly interpolated
2604 between the 2 closest, if 0 the closest will be used
2605 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2606 * @return allocated ReSampleContext, NULL if error occured
2608 ReSampleContext
*av_audio_resample_init(int output_channels
, int input_channels
,
2609 int output_rate
, int input_rate
,
2610 enum SampleFormat sample_fmt_out
,
2611 enum SampleFormat sample_fmt_in
,
2612 int filter_length
, int log2_phase_count
,
2613 int linear
, double cutoff
);
2615 int audio_resample(ReSampleContext
*s
, short *output
, short *input
, int nb_samples
);
2616 void audio_resample_close(ReSampleContext
*s
);
2620 * Initializes an audio resampler.
2621 * Note, if either rate is not an integer then simply scale both rates up so they are.
2622 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2623 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2624 * @param linear If 1 then the used FIR filter will be linearly interpolated
2625 between the 2 closest, if 0 the closest will be used
2626 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2628 struct AVResampleContext
*av_resample_init(int out_rate
, int in_rate
, int filter_length
, int log2_phase_count
, int linear
, double cutoff
);
2632 * @param src an array of unconsumed samples
2633 * @param consumed the number of samples of src which have been consumed are returned here
2634 * @param src_size the number of unconsumed samples available
2635 * @param dst_size the amount of space in samples available in dst
2636 * @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.
2637 * @return the number of samples written in dst or -1 if an error occurred
2639 int av_resample(struct AVResampleContext
*c
, short *dst
, short *src
, int *consumed
, int src_size
, int dst_size
, int update_ctx
);
2643 * Compensates samplerate/timestamp drift. The compensation is done by changing
2644 * the resampler parameters, so no audible clicks or similar distortions occur
2645 * @param compensation_distance distance in output samples over which the compensation should be performed
2646 * @param sample_delta number of output samples which should be output less
2648 * example: av_resample_compensate(c, 10, 500)
2649 * here instead of 510 samples only 500 samples would be output
2651 * note, due to rounding the actual compensation might be slightly different,
2652 * especially if the compensation_distance is large and the in_rate used during init is small
2654 void av_resample_compensate(struct AVResampleContext
*c
, int sample_delta
, int compensation_distance
);
2655 void av_resample_close(struct AVResampleContext
*c
);
2658 * Allocate memory for a picture. Call avpicture_free to free it.
2660 * @param picture the picture to be filled in
2661 * @param pix_fmt the format of the picture
2662 * @param width the width of the picture
2663 * @param height the height of the picture
2664 * @return zero if successful, a negative value if not
2666 int avpicture_alloc(AVPicture
*picture
, enum PixelFormat pix_fmt
, int width
, int height
);
2669 * Free a picture previously allocated by avpicture_alloc().
2671 * @param picture the AVPicture to be freed
2673 void avpicture_free(AVPicture
*picture
);
2676 * Fill in the AVPicture fields.
2677 * The fields of the given AVPicture are filled in by using the 'ptr' address
2678 * which points to the image data buffer. Depending on the specified picture
2679 * format, one or multiple image data pointers and line sizes will be set.
2680 * If a planar format is specified, several pointers will be set pointing to
2681 * the different picture planes and the line sizes of the different planes
2682 * will be stored in the lines_sizes array.
2683 * Call with ptr == NULL to get the required size for the ptr buffer.
2685 * @param picture AVPicture whose fields are to be filled in
2686 * @param ptr Buffer which will contain or contains the actual image data
2687 * @param pix_fmt The format in which the picture data is stored.
2688 * @param width the width of the image in pixels
2689 * @param height the height of the image in pixels
2690 * @return size of the image data in bytes
2692 int avpicture_fill(AVPicture
*picture
, uint8_t *ptr
,
2693 int pix_fmt
, int width
, int height
);
2694 int avpicture_layout(const AVPicture
* src
, enum PixelFormat pix_fmt
, int width
, int height
,
2695 unsigned char *dest
, int dest_size
);
2698 * Calculate the size in bytes that a picture of the given width and height
2699 * would occupy if stored in the given picture format.
2700 * Note that this returns the size of a compact representation as generated
2701 * by avpicture_layout, which can be smaller than the size required for e.g.
2704 * @param pix_fmt the given picture format
2705 * @param width the width of the image
2706 * @param height the height of the image
2707 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
2709 int avpicture_get_size(enum PixelFormat pix_fmt
, int width
, int height
);
2710 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt
, int *h_shift
, int *v_shift
);
2711 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt
);
2712 void avcodec_set_dimensions(AVCodecContext
*s
, int width
, int height
);
2715 * Returns the pixel format corresponding to the name \p name.
2717 * If there is no pixel format with name \p name, then looks for a
2718 * pixel format with the name corresponding to the native endian
2719 * format of \p name.
2720 * For example in a little-endian system, first looks for "gray16",
2721 * then for "gray16le".
2723 * Finally if no pixel format has been found, returns \c PIX_FMT_NONE.
2725 enum PixelFormat
avcodec_get_pix_fmt(const char* name
);
2726 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p
);
2728 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
2729 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
2730 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
2731 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
2732 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
2733 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
2736 * Computes what kind of losses will occur when converting from one specific
2737 * pixel format to another.
2738 * When converting from one pixel format to another, information loss may occur.
2739 * For example, when converting from RGB24 to GRAY, the color information will
2740 * be lost. Similarly, other losses occur when converting from some formats to
2741 * other formats. These losses can involve loss of chroma, but also loss of
2742 * resolution, loss of color depth, loss due to the color space conversion, loss
2743 * of the alpha bits or loss due to color quantization.
2744 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
2745 * which will occur when converting from one pixel format to another.
2747 * @param[in] dst_pix_fmt destination pixel format
2748 * @param[in] src_pix_fmt source pixel format
2749 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2750 * @return Combination of flags informing you what kind of losses will occur.
2752 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt
, enum PixelFormat src_pix_fmt
,
2756 * Finds the best pixel format to convert to given a certain source pixel
2757 * format. When converting from one pixel format to another, information loss
2758 * may occur. For example, when converting from RGB24 to GRAY, the color
2759 * information will be lost. Similarly, other losses occur when converting from
2760 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
2761 * the given pixel formats should be used to suffer the least amount of loss.
2762 * The pixel formats from which it chooses one, are determined by the
2763 * \p pix_fmt_mask parameter.
2766 * src_pix_fmt = PIX_FMT_YUV420P;
2767 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
2768 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
2771 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
2772 * @param[in] src_pix_fmt source pixel format
2773 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2774 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
2775 * @return The best pixel format to convert to or -1 if none was found.
2777 enum PixelFormat
avcodec_find_best_pix_fmt(int64_t pix_fmt_mask
, enum PixelFormat src_pix_fmt
,
2778 int has_alpha
, int *loss_ptr
);
2782 * Print in buf the string corresponding to the pixel format with
2783 * number pix_fmt, or an header if pix_fmt is negative.
2785 * @param[in] buf the buffer where to write the string
2786 * @param[in] buf_size the size of buf
2787 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
2788 * a negative value to print the corresponding header.
2789 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
2791 void avcodec_pix_fmt_string (char *buf
, int buf_size
, enum PixelFormat pix_fmt
);
2793 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
2794 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
2797 * Tell if an image really has transparent alpha values.
2798 * @return ored mask of FF_ALPHA_xxx constants
2800 int img_get_alpha_info(const AVPicture
*src
,
2801 enum PixelFormat pix_fmt
, int width
, int height
);
2803 /* deinterlace a picture */
2804 /* deinterlace - if not supported return -1 */
2805 int avpicture_deinterlace(AVPicture
*dst
, const AVPicture
*src
,
2806 enum PixelFormat pix_fmt
, int width
, int height
);
2808 /* external high level API */
2811 * If c is NULL, returns the first registered codec,
2812 * if c is non-NULL, returns the next registered codec after c,
2813 * or NULL if c is the last one.
2815 AVCodec
*av_codec_next(AVCodec
*c
);
2818 * Returns the LIBAVCODEC_VERSION_INT constant.
2820 unsigned avcodec_version(void);
2823 * Initializes libavcodec.
2825 * @warning This function \e must be called before any other libavcodec
2828 void avcodec_init(void);
2830 #if LIBAVCODEC_VERSION_MAJOR < 53
2832 * @deprecated Deprecated in favor of avcodec_register().
2834 attribute_deprecated
void register_avcodec(AVCodec
*codec
);
2838 * Register the codec \p codec and initialize libavcodec.
2840 * @see avcodec_init()
2842 void avcodec_register(AVCodec
*codec
);
2845 * Finds a registered encoder with a matching codec ID.
2847 * @param id CodecID of the requested encoder
2848 * @return An encoder if one was found, NULL otherwise.
2850 AVCodec
*avcodec_find_encoder(enum CodecID id
);
2853 * Finds a registered encoder with the specified name.
2855 * @param name name of the requested encoder
2856 * @return An encoder if one was found, NULL otherwise.
2858 AVCodec
*avcodec_find_encoder_by_name(const char *name
);
2861 * Finds a registered decoder with a matching codec ID.
2863 * @param id CodecID of the requested decoder
2864 * @return A decoder if one was found, NULL otherwise.
2866 AVCodec
*avcodec_find_decoder(enum CodecID id
);
2869 * Finds a registered decoder with the specified name.
2871 * @param name name of the requested decoder
2872 * @return A decoder if one was found, NULL otherwise.
2874 AVCodec
*avcodec_find_decoder_by_name(const char *name
);
2875 void avcodec_string(char *buf
, int buf_size
, AVCodecContext
*enc
, int encode
);
2878 * Sets the fields of the given AVCodecContext to default values.
2880 * @param s The AVCodecContext of which the fields should be set to default values.
2882 void avcodec_get_context_defaults(AVCodecContext
*s
);
2884 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2885 * we WILL change its arguments and name a few times! */
2886 void avcodec_get_context_defaults2(AVCodecContext
*s
, enum CodecType
);
2889 * Allocates an AVCodecContext and sets its fields to default values. The
2890 * resulting struct can be deallocated by simply calling av_free().
2892 * @return An AVCodecContext filled with default values or NULL on failure.
2893 * @see avcodec_get_context_defaults
2895 AVCodecContext
*avcodec_alloc_context(void);
2897 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2898 * we WILL change its arguments and name a few times! */
2899 AVCodecContext
*avcodec_alloc_context2(enum CodecType
);
2902 * Sets the fields of the given AVFrame to default values.
2904 * @param pic The AVFrame of which the fields should be set to default values.
2906 void avcodec_get_frame_defaults(AVFrame
*pic
);
2909 * Allocates an AVFrame and sets its fields to default values. The resulting
2910 * struct can be deallocated by simply calling av_free().
2912 * @return An AVFrame filled with default values or NULL on failure.
2913 * @see avcodec_get_frame_defaults
2915 AVFrame
*avcodec_alloc_frame(void);
2917 int avcodec_default_get_buffer(AVCodecContext
*s
, AVFrame
*pic
);
2918 void avcodec_default_release_buffer(AVCodecContext
*s
, AVFrame
*pic
);
2919 int avcodec_default_reget_buffer(AVCodecContext
*s
, AVFrame
*pic
);
2920 void avcodec_align_dimensions(AVCodecContext
*s
, int *width
, int *height
);
2923 * Checks if the given dimension of a picture is valid, meaning that all
2924 * bytes of the picture can be addressed with a signed int.
2926 * @param[in] w Width of the picture.
2927 * @param[in] h Height of the picture.
2928 * @return Zero if valid, a negative value if invalid.
2930 int avcodec_check_dimensions(void *av_log_ctx
, unsigned int w
, unsigned int h
);
2931 enum PixelFormat
avcodec_default_get_format(struct AVCodecContext
*s
, const enum PixelFormat
* fmt
);
2933 int avcodec_thread_init(AVCodecContext
*s
, int thread_count
);
2934 void avcodec_thread_free(AVCodecContext
*s
);
2935 int avcodec_thread_execute(AVCodecContext
*s
, int (*func
)(AVCodecContext
*c2
, void *arg2
),void *arg
, int *ret
, int count
, int size
);
2936 int avcodec_default_execute(AVCodecContext
*c
, int (*func
)(AVCodecContext
*c2
, void *arg2
),void *arg
, int *ret
, int count
, int size
);
2937 //FIXME func typedef
2940 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
2941 * function the context has to be allocated.
2943 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2944 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2945 * retrieving a codec.
2947 * @warning This function is not thread safe!
2950 * avcodec_register_all();
2951 * codec = avcodec_find_decoder(CODEC_ID_H264);
2955 * context = avcodec_alloc_context();
2957 * if (avcodec_open(context, codec) < 0)
2961 * @param avctx The context which will be set up to use the given codec.
2962 * @param codec The codec to use within the context.
2963 * @return zero on success, a negative value on error
2964 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
2966 int avcodec_open(AVCodecContext
*avctx
, AVCodec
*codec
);
2969 * Decodes an audio frame from \p buf into \p samples.
2970 * The avcodec_decode_audio2() function decodes an audio frame from the input
2971 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2972 * audio codec which was coupled with \p avctx using avcodec_open(). The
2973 * resulting decoded frame is stored in output buffer \p samples. If no frame
2974 * could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
2975 * decompressed frame size in \e bytes.
2977 * @warning You \e must set \p frame_size_ptr to the allocated size of the
2978 * output buffer before calling avcodec_decode_audio2().
2980 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2981 * the actual read bytes because some optimized bitstream readers read 32 or 64
2982 * bits at once and could read over the end.
2984 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2985 * no overreading happens for damaged MPEG streams.
2987 * @note You might have to align the input buffer \p buf and output buffer \p
2988 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
2989 * necessary at all, on others it won't work at all if not aligned and on others
2990 * it will work but it will have an impact on performance. In practice, the
2991 * bitstream should have 4 byte alignment at minimum and all sample data should
2992 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2993 * the linesize is not a multiple of 16 then there's no sense in aligning the
2994 * start of the buffer to 16.
2996 * @param avctx the codec context
2997 * @param[out] samples the output buffer
2998 * @param[in,out] frame_size_ptr the output buffer size in bytes
2999 * @param[in] buf the input buffer
3000 * @param[in] buf_size the input buffer size in bytes
3001 * @return On error a negative value is returned, otherwise the number of bytes
3002 * used or zero if no frame could be decompressed.
3004 int avcodec_decode_audio2(AVCodecContext
*avctx
, int16_t *samples
,
3005 int *frame_size_ptr
,
3006 const uint8_t *buf
, int buf_size
);
3009 * Decodes a video frame from \p buf into \p picture.
3010 * The avcodec_decode_video() function decodes a video frame from the input
3011 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
3012 * video codec which was coupled with \p avctx using avcodec_open(). The
3013 * resulting decoded frame is stored in \p picture.
3015 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
3016 * the actual read bytes because some optimized bitstream readers read 32 or 64
3017 * bits at once and could read over the end.
3019 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
3020 * no overreading happens for damaged MPEG streams.
3022 * @note You might have to align the input buffer \p buf and output buffer \p
3023 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
3024 * necessary at all, on others it won't work at all if not aligned and on others
3025 * it will work but it will have an impact on performance. In practice, the
3026 * bitstream should have 4 byte alignment at minimum and all sample data should
3027 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
3028 * the linesize is not a multiple of 16 then there's no sense in aligning the
3029 * start of the buffer to 16.
3031 * @note Some codecs have a delay between input and output, these need to be
3032 * feeded with buf=NULL, buf_size=0 at the end to return the remaining frames.
3034 * @param avctx the codec context
3035 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3036 * @param[in] buf the input buffer
3037 * @param[in] buf_size the size of the input buffer in bytes
3038 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3039 * @return On error a negative value is returned, otherwise the number of bytes
3040 * used or zero if no frame could be decompressed.
3042 int avcodec_decode_video(AVCodecContext
*avctx
, AVFrame
*picture
,
3043 int *got_picture_ptr
,
3044 const uint8_t *buf
, int buf_size
);
3046 /* Decode a subtitle message. Return -1 if error, otherwise return the
3047 * number of bytes used. If no subtitle could be decompressed,
3048 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3049 int avcodec_decode_subtitle(AVCodecContext
*avctx
, AVSubtitle
*sub
,
3051 const uint8_t *buf
, int buf_size
);
3052 int avcodec_parse_frame(AVCodecContext
*avctx
, uint8_t **pdata
,
3054 uint8_t *buf
, int buf_size
);
3057 * Encodes an audio frame from \p samples into \p buf.
3058 * The avcodec_encode_audio() function encodes an audio frame from the input
3059 * buffer \p samples. To encode it, it makes use of the audio codec which was
3060 * coupled with \p avctx using avcodec_open(). The resulting encoded frame is
3061 * stored in output buffer \p buf.
3063 * @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
3065 * @param avctx the codec context
3066 * @param[out] buf the output buffer
3067 * @param[in] buf_size the output buffer size
3068 * @param[in] samples the input buffer containing the samples
3069 * The number of samples read from this buffer is frame_size*channels,
3070 * both of which are defined in \p avctx.
3071 * For PCM audio the number of samples read from \p samples is equal to
3072 * \p buf_size * input_sample_size / output_sample_size.
3073 * @return On error a negative value is returned, on success zero or the number
3074 * of bytes used to encode the data read from the input buffer.
3076 int avcodec_encode_audio(AVCodecContext
*avctx
, uint8_t *buf
, int buf_size
,
3077 const short *samples
);
3080 * Encodes a video frame from \p pict into \p buf.
3081 * The avcodec_encode_video() function encodes a video frame from the input
3082 * \p pict. To encode it, it makes use of the video codec which was coupled with
3083 * \p avctx using avcodec_open(). The resulting encoded bytes representing the
3084 * frame are stored in the output buffer \p buf. The input picture should be
3085 * stored using a specific format, namely \c avctx.pix_fmt.
3087 * @param avctx the codec context
3088 * @param[out] buf the output buffer for the bitstream of encoded frame
3089 * @param[in] buf_size the size of the output buffer in bytes
3090 * @param[in] pict the input picture to encode
3091 * @return On error a negative value is returned, on success zero or the number
3092 * of bytes used from the output buffer.
3094 int avcodec_encode_video(AVCodecContext
*avctx
, uint8_t *buf
, int buf_size
,
3095 const AVFrame
*pict
);
3096 int avcodec_encode_subtitle(AVCodecContext
*avctx
, uint8_t *buf
, int buf_size
,
3097 const AVSubtitle
*sub
);
3099 int avcodec_close(AVCodecContext
*avctx
);
3102 * Register all the codecs, parsers and bitstream filters which were enabled at
3103 * configuration time. If you do not call this function you can select exactly
3104 * which formats you want to support, by using the individual registration
3107 * @see avcodec_register
3108 * @see av_register_codec_parser
3109 * @see av_register_bitstream_filter
3111 void avcodec_register_all(void);
3114 * Flush buffers, should be called when seeking or when switching to a different stream.
3116 void avcodec_flush_buffers(AVCodecContext
*avctx
);
3118 void avcodec_default_free_buffers(AVCodecContext
*s
);
3120 /* misc useful functions */
3123 * Returns a single letter to describe the given picture type \p pict_type.
3125 * @param[in] pict_type the picture type
3126 * @return A single character representing the picture type.
3128 char av_get_pict_type_char(int pict_type
);
3131 * Returns codec bits per sample.
3133 * @param[in] codec_id the codec
3134 * @return Number of bits per sample or zero if unknown for the given codec.
3136 int av_get_bits_per_sample(enum CodecID codec_id
);
3139 * Returns sample format bits per sample.
3141 * @param[in] sample_fmt the sample format
3142 * @return Number of bits per sample or zero if unknown for the given sample format.
3144 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt
);
3147 typedef struct AVCodecParserContext
{
3149 struct AVCodecParser
*parser
;
3150 int64_t frame_offset
; /* offset of the current frame */
3151 int64_t cur_offset
; /* current offset
3152 (incremented by each av_parser_parse()) */
3153 int64_t next_frame_offset
; /* offset of the next frame */
3155 int pict_type
; /* XXX: Put it back in AVCodecContext. */
3157 * This field is used for proper frame duration computation in lavf.
3158 * It signals, how much longer the frame duration of the current frame
3159 * is compared to normal frame duration.
3161 * frame_duration = (1 + repeat_pict) * time_base
3163 * It is used by codecs like H.264 to display telecined material.
3165 int repeat_pict
; /* XXX: Put it back in AVCodecContext. */
3166 int64_t pts
; /* pts of the current frame */
3167 int64_t dts
; /* dts of the current frame */
3172 int fetch_timestamp
;
3174 #define AV_PARSER_PTS_NB 4
3175 int cur_frame_start_index
;
3176 int64_t cur_frame_offset
[AV_PARSER_PTS_NB
];
3177 int64_t cur_frame_pts
[AV_PARSER_PTS_NB
];
3178 int64_t cur_frame_dts
[AV_PARSER_PTS_NB
];
3181 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3183 int64_t offset
; ///< byte offset from starting packet start
3184 int64_t cur_frame_end
[AV_PARSER_PTS_NB
];
3187 * Set by parser to 1 for key frames and 0 for non-key frames.
3188 * It is initialized to -1, so if the parser doesn't set this flag,
3189 * old-style fallback using FF_I_TYPE picture type as key frames
3195 * Time difference in stream time base units from the pts of this
3196 * packet to the point at which the output from the decoder has converged
3197 * independent from the availability of previous frames. That is, the
3198 * frames are virtually identical no matter if decoding started from
3199 * the very first frame or from this keyframe.
3200 * Is AV_NOPTS_VALUE if unknown.
3201 * This field is not the display duration of the current frame.
3203 * The purpose of this field is to allow seeking in streams that have no
3204 * keyframes in the conventional sense. It corresponds to the
3205 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3206 * essential for some types of subtitle streams to ensure that all
3207 * subtitles are correctly displayed after seeking.
3209 int64_t convergence_duration
;
3211 // Timestamp generation support:
3213 * Synchronization point for start of timestamp generation.
3215 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3218 * For example, this corresponds to presence of H.264 buffering period
3224 * Offset of the current timestamp against last timestamp sync point in
3225 * units of AVCodecContext.time_base.
3227 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3228 * contain a valid timestamp offset.
3230 * Note that the timestamp of sync point has usually a nonzero
3231 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3232 * the next frame after timestamp sync point will be usually 1.
3234 * For example, this corresponds to H.264 cpb_removal_delay.
3236 int dts_ref_dts_delta
;
3239 * Presentation delay of current frame in units of AVCodecContext.time_base.
3241 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3242 * contain valid non-negative timestamp delta (presentation time of a frame
3243 * must not lie in the past).
3245 * This delay represents the difference between decoding and presentation
3246 * time of the frame.
3248 * For example, this corresponds to H.264 dpb_output_delay.
3253 * Position of the packet in file.
3255 * Analogous to cur_frame_pts/dts
3257 int64_t cur_frame_pos
[AV_PARSER_PTS_NB
];
3260 * Byte position of currently parsed frame in stream.
3265 * Previous frame byte position.
3268 } AVCodecParserContext
;
3270 typedef struct AVCodecParser
{
3271 int codec_ids
[5]; /* several codec IDs are permitted */
3273 int (*parser_init
)(AVCodecParserContext
*s
);
3274 int (*parser_parse
)(AVCodecParserContext
*s
,
3275 AVCodecContext
*avctx
,
3276 const uint8_t **poutbuf
, int *poutbuf_size
,
3277 const uint8_t *buf
, int buf_size
);
3278 void (*parser_close
)(AVCodecParserContext
*s
);
3279 int (*split
)(AVCodecContext
*avctx
, const uint8_t *buf
, int buf_size
);
3280 struct AVCodecParser
*next
;
3283 AVCodecParser
*av_parser_next(AVCodecParser
*c
);
3285 void av_register_codec_parser(AVCodecParser
*parser
);
3286 AVCodecParserContext
*av_parser_init(int codec_id
);
3288 #if LIBAVCODEC_VERSION_MAJOR < 53
3289 attribute_deprecated
3290 int av_parser_parse(AVCodecParserContext
*s
,
3291 AVCodecContext
*avctx
,
3292 uint8_t **poutbuf
, int *poutbuf_size
,
3293 const uint8_t *buf
, int buf_size
,
3294 int64_t pts
, int64_t dts
);
3300 * @param s parser context.
3301 * @param avctx codec context.
3302 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3303 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3304 * @param buf input buffer.
3305 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3306 * @param pts input presentation timestamp.
3307 * @param dts input decoding timestamp.
3308 * @param pos input byte position in stream.
3309 * @return the number of bytes of the input bitstream used.
3314 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3321 * decode_frame(data, size);
3325 int av_parser_parse2(AVCodecParserContext
*s
,
3326 AVCodecContext
*avctx
,
3327 uint8_t **poutbuf
, int *poutbuf_size
,
3328 const uint8_t *buf
, int buf_size
,
3329 int64_t pts
, int64_t dts
,
3332 int av_parser_change(AVCodecParserContext
*s
,
3333 AVCodecContext
*avctx
,
3334 uint8_t **poutbuf
, int *poutbuf_size
,
3335 const uint8_t *buf
, int buf_size
, int keyframe
);
3336 void av_parser_close(AVCodecParserContext
*s
);
3339 typedef struct AVBitStreamFilterContext
{
3341 struct AVBitStreamFilter
*filter
;
3342 AVCodecParserContext
*parser
;
3343 struct AVBitStreamFilterContext
*next
;
3344 } AVBitStreamFilterContext
;
3347 typedef struct AVBitStreamFilter
{
3350 int (*filter
)(AVBitStreamFilterContext
*bsfc
,
3351 AVCodecContext
*avctx
, const char *args
,
3352 uint8_t **poutbuf
, int *poutbuf_size
,
3353 const uint8_t *buf
, int buf_size
, int keyframe
);
3354 void (*close
)(AVBitStreamFilterContext
*bsfc
);
3355 struct AVBitStreamFilter
*next
;
3356 } AVBitStreamFilter
;
3358 void av_register_bitstream_filter(AVBitStreamFilter
*bsf
);
3359 AVBitStreamFilterContext
*av_bitstream_filter_init(const char *name
);
3360 int av_bitstream_filter_filter(AVBitStreamFilterContext
*bsfc
,
3361 AVCodecContext
*avctx
, const char *args
,
3362 uint8_t **poutbuf
, int *poutbuf_size
,
3363 const uint8_t *buf
, int buf_size
, int keyframe
);
3364 void av_bitstream_filter_close(AVBitStreamFilterContext
*bsf
);
3366 AVBitStreamFilter
*av_bitstream_filter_next(AVBitStreamFilter
*f
);
3371 * Reallocates the given block if it is not large enough, otherwise it
3376 void *av_fast_realloc(void *ptr
, unsigned int *size
, unsigned int min_size
);
3379 * Copy image 'src' to 'dst'.
3381 void av_picture_copy(AVPicture
*dst
, const AVPicture
*src
,
3382 enum PixelFormat pix_fmt
, int width
, int height
);
3385 * Crop image top and left side.
3387 int av_picture_crop(AVPicture
*dst
, const AVPicture
*src
,
3388 enum PixelFormat pix_fmt
, int top_band
, int left_band
);
3393 int av_picture_pad(AVPicture
*dst
, const AVPicture
*src
, int height
, int width
, enum PixelFormat pix_fmt
,
3394 int padtop
, int padbottom
, int padleft
, int padright
, int *color
);
3396 unsigned int av_xiphlacing(unsigned char *s
, unsigned int v
);
3399 * Parses \p str and put in \p width_ptr and \p height_ptr the detected values.
3401 * @return 0 in case of a successful parsing, a negative value otherwise
3402 * @param[in] str the string to parse: it has to be a string in the format
3403 * <width>x<height> or a valid video frame size abbreviation.
3404 * @param[in,out] width_ptr pointer to the variable which will contain the detected
3406 * @param[in,out] height_ptr pointer to the variable which will contain the detected
3407 * frame height value
3409 int av_parse_video_frame_size(int *width_ptr
, int *height_ptr
, const char *str
);
3412 * Parses \p str and put in \p frame_rate the detected values.
3414 * @return 0 in case of a successful parsing, a negative value otherwise
3415 * @param[in] str the string to parse: it has to be a string in the format
3416 * <frame_rate_num>/<frame_rate_den>, a float number or a valid video rate abbreviation
3417 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
3420 int av_parse_video_frame_rate(AVRational
*frame_rate
, const char *str
);
3422 /* error handling */
3424 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
3425 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
3427 /* Some platforms have E* and errno already negated. */
3428 #define AVERROR(e) (e)
3429 #define AVUNERROR(e) (e)
3431 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
3432 #define AVERROR_IO AVERROR(EIO) /**< I/O error */
3433 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< Number syntax expected in filename. */
3434 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
3435 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
3436 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
3437 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< Operation not supported. */
3438 #define AVERROR_NOENT AVERROR(ENOENT) /**< No such file or directory. */
3439 #define AVERROR_EOF AVERROR(EPIPE) /**< End of file. */
3440 #define AVERROR_PATCHWELCOME -MKTAG('P','A','W','E') /**< Not yet implemented in FFmpeg. Patches welcome. */
3443 * Registers the hardware accelerator \p hwaccel.
3445 void av_register_hwaccel(AVHWAccel
*hwaccel
);
3448 * If hwaccel is NULL, returns the first registered hardware accelerator,
3449 * if hwaccel is non-NULL, returns the next registered hardware accelerator
3450 * after hwaccel, or NULL if hwaccel is the last one.
3452 AVHWAccel
*av_hwaccel_next(AVHWAccel
*hwaccel
);
3454 #endif /* AVCODEC_AVCODEC_H */