2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/avutil.h"
32 #define LIBAVCODEC_VERSION_MAJOR 52
33 #define LIBAVCODEC_VERSION_MINOR 67
34 #define LIBAVCODEC_VERSION_MICRO 2
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,
128 #if LIBAVCODEC_VERSION_MAJOR < 53
147 CODEC_ID_TRUEMOTION2,
164 CODEC_ID_DSICINVIDEO,
165 CODEC_ID_TIERTEXSEQVIDEO,
174 CODEC_ID_BETHSOFTVID,
192 CODEC_ID_MOTIONPIXELS,
210 CODEC_ID_IFF_BYTERUN1,
214 /* various PCM "codecs" */
215 CODEC_ID_PCM_S16LE= 0x10000,
231 CODEC_ID_PCM_S24DAUD,
233 CODEC_ID_PCM_S16LE_PLANAR,
241 /* various ADPCM codecs */
242 CODEC_ID_ADPCM_IMA_QT= 0x11000,
243 CODEC_ID_ADPCM_IMA_WAV,
244 CODEC_ID_ADPCM_IMA_DK3,
245 CODEC_ID_ADPCM_IMA_DK4,
246 CODEC_ID_ADPCM_IMA_WS,
247 CODEC_ID_ADPCM_IMA_SMJPEG,
256 CODEC_ID_ADPCM_YAMAHA,
257 CODEC_ID_ADPCM_SBPRO_4,
258 CODEC_ID_ADPCM_SBPRO_3,
259 CODEC_ID_ADPCM_SBPRO_2,
261 CODEC_ID_ADPCM_IMA_AMV,
262 CODEC_ID_ADPCM_EA_R1,
263 CODEC_ID_ADPCM_EA_R3,
264 CODEC_ID_ADPCM_EA_R2,
265 CODEC_ID_ADPCM_IMA_EA_SEAD,
266 CODEC_ID_ADPCM_IMA_EA_EACS,
267 CODEC_ID_ADPCM_EA_XAS,
268 CODEC_ID_ADPCM_EA_MAXIS_XA,
269 CODEC_ID_ADPCM_IMA_ISS,
272 CODEC_ID_AMR_NB= 0x12000,
275 /* RealAudio codecs*/
276 CODEC_ID_RA_144= 0x13000,
279 /* various DPCM codecs */
280 CODEC_ID_ROQ_DPCM= 0x14000,
281 CODEC_ID_INTERPLAY_DPCM,
286 CODEC_ID_MP2= 0x15000,
287 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
305 CODEC_ID_WESTWOOD_SND1,
306 CODEC_ID_GSM, ///< as in Berlin toast format
314 CODEC_ID_DSICINAUDIO,
318 CODEC_ID_GSM_MS, /* as found in WAV */
327 CODEC_ID_WMALOSSLESS,
336 CODEC_ID_BINKAUDIO_RDFT,
337 CODEC_ID_BINKAUDIO_DCT,
339 /* subtitle codecs */
340 CODEC_ID_DVD_SUBTITLE= 0x17000,
341 CODEC_ID_DVB_SUBTITLE,
342 CODEC_ID_TEXT, ///< raw UTF-8 text
346 CODEC_ID_HDMV_PGS_SUBTITLE,
347 CODEC_ID_DVB_TELETEXT,
349 /* other specific kind of codecs (generally used for attachments) */
350 CODEC_ID_TTF= 0x18000,
352 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
354 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
355 * stream (only used by libavformat) */
358 #if LIBAVCODEC_VERSION_MAJOR < 53
359 #define CodecType AVMediaType
361 #define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
362 #define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
363 #define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
364 #define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
365 #define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
366 #define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
367 #define CODEC_TYPE_NB AVMEDIA_TYPE_NB
371 * all in native-endian format
374 SAMPLE_FMT_NONE = -1,
375 SAMPLE_FMT_U8, ///< unsigned 8 bits
376 SAMPLE_FMT_S16, ///< signed 16 bits
377 SAMPLE_FMT_S32, ///< signed 32 bits
378 SAMPLE_FMT_FLT, ///< float
379 SAMPLE_FMT_DBL, ///< double
380 SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
383 /* Audio channel masks */
384 #define CH_FRONT_LEFT 0x00000001
385 #define CH_FRONT_RIGHT 0x00000002
386 #define CH_FRONT_CENTER 0x00000004
387 #define CH_LOW_FREQUENCY 0x00000008
388 #define CH_BACK_LEFT 0x00000010
389 #define CH_BACK_RIGHT 0x00000020
390 #define CH_FRONT_LEFT_OF_CENTER 0x00000040
391 #define CH_FRONT_RIGHT_OF_CENTER 0x00000080
392 #define CH_BACK_CENTER 0x00000100
393 #define CH_SIDE_LEFT 0x00000200
394 #define CH_SIDE_RIGHT 0x00000400
395 #define CH_TOP_CENTER 0x00000800
396 #define CH_TOP_FRONT_LEFT 0x00001000
397 #define CH_TOP_FRONT_CENTER 0x00002000
398 #define CH_TOP_FRONT_RIGHT 0x00004000
399 #define CH_TOP_BACK_LEFT 0x00008000
400 #define CH_TOP_BACK_CENTER 0x00010000
401 #define CH_TOP_BACK_RIGHT 0x00020000
402 #define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
403 #define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
405 /** Channel mask value used for AVCodecContext.request_channel_layout
406 to indicate that the user requests the channel order of the decoder output
407 to be the native codec channel order. */
408 #define CH_LAYOUT_NATIVE 0x8000000000000000LL
410 /* Audio channel convenience macros */
411 #define CH_LAYOUT_MONO (CH_FRONT_CENTER)
412 #define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
413 #define CH_LAYOUT_2_1 (CH_LAYOUT_STEREO|CH_BACK_CENTER)
414 #define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
415 #define CH_LAYOUT_4POINT0 (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
416 #define CH_LAYOUT_2_2 (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
417 #define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
418 #define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
419 #define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
420 #define CH_LAYOUT_5POINT0_BACK (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
421 #define CH_LAYOUT_5POINT1_BACK (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
422 #define CH_LAYOUT_7POINT0 (CH_LAYOUT_5POINT0|CH_BACK_LEFT|CH_BACK_RIGHT)
423 #define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
424 #define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_5POINT1_BACK|\
425 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
426 #define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
429 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
432 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
433 * This is mainly needed because some optimized bitstream readers read
434 * 32 or 64 bit at once and could read over the end.<br>
435 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
436 * MPEG bitstreams could cause overread and segfault.
438 #define FF_INPUT_BUFFER_PADDING_SIZE 8
441 * minimum encoding buffer size
442 * Used to avoid some checks during header writing.
444 #define FF_MIN_BUFFER_SIZE 16384
448 * motion estimation type.
451 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
455 ME_EPZS, ///< enhanced predictive zonal search
456 ME_X1, ///< reserved for experiments
457 ME_HEX, ///< hexagon based search
458 ME_UMH, ///< uneven multi-hexagon search
459 ME_ITER, ///< iterative search
460 ME_TESA, ///< transformed exhaustive search algorithm
464 /* We leave some space between them for extensions (drop some
465 * keyframes for intra-only or drop just some bidir frames). */
466 AVDISCARD_NONE =-16, ///< discard nothing
467 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
468 AVDISCARD_NONREF = 8, ///< discard all non reference
469 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
470 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
471 AVDISCARD_ALL = 48, ///< discard all
474 enum AVColorPrimaries{
475 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
476 AVCOL_PRI_UNSPECIFIED=2,
478 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
479 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
480 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
482 AVCOL_PRI_NB , ///< Not part of ABI
485 enum AVColorTransferCharacteristic{
486 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
487 AVCOL_TRC_UNSPECIFIED=2,
488 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
489 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
490 AVCOL_TRC_NB , ///< Not part of ABI
495 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
496 AVCOL_SPC_UNSPECIFIED=2,
498 AVCOL_SPC_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
499 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
500 AVCOL_SPC_SMPTE240M =7,
501 AVCOL_SPC_NB , ///< Not part of ABI
505 AVCOL_RANGE_UNSPECIFIED=0,
506 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
507 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
508 AVCOL_RANGE_NB , ///< Not part of ABI
512 * X X 3 4 X X are luma samples,
513 * 1 2 1-6 are possible chroma positions
514 * X X 5 6 X 0 is undefined/unknown position
516 enum AVChromaLocation{
517 AVCHROMA_LOC_UNSPECIFIED=0,
518 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
519 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
520 AVCHROMA_LOC_TOPLEFT =3, ///< DV
522 AVCHROMA_LOC_BOTTOMLEFT =5,
523 AVCHROMA_LOC_BOTTOM =6,
524 AVCHROMA_LOC_NB , ///< Not part of ABI
527 typedef struct RcOverride{
530 int qscale; // If this is 0 then quality_factor will be used instead.
531 float quality_factor;
534 #define FF_MAX_B_FRAMES 16
537 These flags can be passed in AVCodecContext.flags before initialization.
538 Note: Not everything is supported yet.
541 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
542 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
543 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
544 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
545 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
546 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
548 * The parent program guarantees that the input for B-frames containing
549 * streams is not written to for at least s->max_b_frames+1 frames, if
550 * this is not set the input will be copied.
552 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
553 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
554 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
555 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
556 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
557 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
558 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
559 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
560 location instead of only at frame boundaries. */
561 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
562 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
563 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
564 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
565 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
566 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
567 /* Fx : Flag for h263+ extra options */
568 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
569 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
570 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
571 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
572 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
573 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
574 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
575 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
576 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
577 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
578 #define CODEC_FLAG_CLOSED_GOP 0x80000000
579 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
580 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
581 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
582 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
583 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
584 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
585 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
586 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
587 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
588 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
589 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
590 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
591 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
592 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
593 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
594 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
595 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
596 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
597 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
598 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
599 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
600 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
602 /* Unsupported options :
603 * Syntax Arithmetic coding (SAC)
604 * Reference Picture Selection
605 * Independent Segment Decoding */
607 /* codec capabilities */
609 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
611 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
612 * If not set, it might not use get_buffer() at all or use operations that
613 * assume the buffer was allocated by avcodec_default_get_buffer.
615 #define CODEC_CAP_DR1 0x0002
616 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
617 #define CODEC_CAP_PARSE_ONLY 0x0004
618 #define CODEC_CAP_TRUNCATED 0x0008
619 /* Codec can export data for HW decoding (XvMC). */
620 #define CODEC_CAP_HWACCEL 0x0010
622 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
623 * If this is not set, the codec is guaranteed to never be fed with NULL data.
625 #define CODEC_CAP_DELAY 0x0020
627 * Codec can be fed a final frame with a smaller size.
628 * This can be used to prevent truncation of the last audio samples.
630 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
632 * Codec can export data for HW decoding (VDPAU).
634 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
636 * Codec can output multiple frames per AVPacket
637 * Normally demuxers return one frame at a time, demuxers which do not do
638 * are connected to a parser to split what they return into proper frames.
639 * This flag is reserved to the very rare category of codecs which have a
640 * bitstream that cannot be split into frames without timeconsuming
641 * operations like full decoding. Demuxers carring such bitstreams thus
642 * may return multiple frames in a packet. This has many disadvantages like
643 * prohibiting stream copy in many cases thus it should only be considered
646 #define CODEC_CAP_SUBFRAMES 0x0100
648 //The following defines may change, don't expect compatibility if you use them.
649 #define MB_TYPE_INTRA4x4 0x0001
650 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
651 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
652 #define MB_TYPE_16x16 0x0008
653 #define MB_TYPE_16x8 0x0010
654 #define MB_TYPE_8x16 0x0020
655 #define MB_TYPE_8x8 0x0040
656 #define MB_TYPE_INTERLACED 0x0080
657 #define MB_TYPE_DIRECT2 0x0100 //FIXME
658 #define MB_TYPE_ACPRED 0x0200
659 #define MB_TYPE_GMC 0x0400
660 #define MB_TYPE_SKIP 0x0800
661 #define MB_TYPE_P0L0 0x1000
662 #define MB_TYPE_P1L0 0x2000
663 #define MB_TYPE_P0L1 0x4000
664 #define MB_TYPE_P1L1 0x8000
665 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
666 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
667 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
668 #define MB_TYPE_QUANT 0x00010000
669 #define MB_TYPE_CBP 0x00020000
670 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
674 * This specifies the area which should be displayed.
675 * Note there may be multiple such areas for one frame.
677 typedef struct AVPanScan{
680 * - encoding: Set by user.
681 * - decoding: Set by libavcodec.
686 * width and height in 1/16 pel
687 * - encoding: Set by user.
688 * - decoding: Set by libavcodec.
694 * position of the top left corner in 1/16 pel for up to 3 fields/frames
695 * - encoding: Set by user.
696 * - decoding: Set by libavcodec.
698 int16_t position[3][2];
701 #define FF_COMMON_FRAME \
703 * pointer to the picture planes.\
704 * This might be different from the first allocated byte\
711 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
712 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
718 * 1 -> keyframe, 0-> not\
719 * - encoding: Set by libavcodec.\
720 * - decoding: Set by libavcodec.\
725 * Picture type of the frame, see ?_TYPE below.\
726 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
727 * - decoding: Set by libavcodec.\
732 * presentation timestamp in time_base units (time when frame should be shown to user)\
733 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
734 * - encoding: MUST be set by user.\
735 * - decoding: Set by libavcodec.\
740 * picture number in bitstream order\
741 * - encoding: set by\
742 * - decoding: Set by libavcodec.\
744 int coded_picture_number;\
746 * picture number in display order\
747 * - encoding: set by\
748 * - decoding: Set by libavcodec.\
750 int display_picture_number;\
753 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
754 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
755 * - decoding: Set by libavcodec.\
760 * buffer age (1->was last buffer and dint change, 2->..., ...).\
761 * Set to INT_MAX if the buffer has not been used yet.\
762 * - encoding: unused\
763 * - decoding: MUST be set by get_buffer().\
768 * is this picture used as reference\
769 * The values for this are the same as the MpegEncContext.picture_structure\
770 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
771 * Set to 4 for delayed, non-reference frames.\
772 * - encoding: unused\
773 * - decoding: Set by libavcodec. (before get_buffer() call)).\
779 * - encoding: unused\
780 * - decoding: Set by libavcodec.\
782 int8_t *qscale_table;\
785 * - encoding: unused\
786 * - decoding: Set by libavcodec.\
791 * mbskip_table[mb]>=1 if MB didn't change\
792 * stride= mb_width = (width+15)>>4\
793 * - encoding: unused\
794 * - decoding: Set by libavcodec.\
796 uint8_t *mbskip_table;\
799 * motion vector table\
802 * int mv_sample_log2= 4 - motion_subsample_log2;\
803 * int mb_width= (width+15)>>4;\
804 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
805 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
807 * - encoding: Set by user.\
808 * - decoding: Set by libavcodec.\
810 int16_t (*motion_val[2])[2];\
813 * macroblock type table\
814 * mb_type_base + mb_width + 2\
815 * - encoding: Set by user.\
816 * - decoding: Set by libavcodec.\
821 * log2 of the size of the block which a single vector in motion_val represents: \
822 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
823 * - encoding: unused\
824 * - decoding: Set by libavcodec.\
826 uint8_t motion_subsample_log2;\
829 * for some private data of the user\
830 * - encoding: unused\
831 * - decoding: Set by user.\
837 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
838 * - decoding: unused\
843 * type of the buffer (to keep track of who has to deallocate data[*])\
844 * - encoding: Set by the one who allocates it.\
845 * - decoding: Set by the one who allocates it.\
846 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
851 * When decoding, this signals how much the picture must be delayed.\
852 * extra_delay = repeat_pict / (2*fps)\
853 * - encoding: unused\
854 * - decoding: Set by libavcodec.\
864 * The content of the picture is interlaced.\
865 * - encoding: Set by user.\
866 * - decoding: Set by libavcodec. (default 0)\
868 int interlaced_frame;\
871 * If the content is interlaced, is top field displayed first.\
872 * - encoding: Set by user.\
873 * - decoding: Set by libavcodec.\
875 int top_field_first;\
879 * - encoding: Set by user.\
880 * - decoding: Set by libavcodec.\
882 AVPanScan *pan_scan;\
885 * Tell user application that palette has changed from previous frame.\
886 * - encoding: ??? (no palette-enabled encoder yet)\
887 * - decoding: Set by libavcodec. (default 0).\
889 int palette_has_changed;\
892 * codec suggestion on buffer type if != 0\
893 * - encoding: unused\
894 * - decoding: Set by libavcodec. (before get_buffer() call)).\
900 * - encoding: unused\
901 * - decoding: Set by libavcodec.\
906 * motion reference frame index\
907 * the order in which these are stored can depend on the codec.\
908 * - encoding: Set by user.\
909 * - decoding: Set by libavcodec.\
911 int8_t *ref_index[2];\
914 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
915 * output in AVFrame.reordered_opaque\
916 * - encoding: unused\
917 * - decoding: Read by user.\
919 int64_t reordered_opaque;\
922 * hardware accelerator private data (FFmpeg allocated)\
923 * - encoding: unused\
924 * - decoding: Set by libavcodec\
926 void *hwaccel_picture_private;\
929 #define FF_QSCALE_TYPE_MPEG1 0
930 #define FF_QSCALE_TYPE_MPEG2 1
931 #define FF_QSCALE_TYPE_H264 2
932 #define FF_QSCALE_TYPE_VP56 3
934 #define FF_BUFFER_TYPE_INTERNAL 1
935 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
936 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
937 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
940 #define FF_I_TYPE 1 ///< Intra
941 #define FF_P_TYPE 2 ///< Predicted
942 #define FF_B_TYPE 3 ///< Bi-dir predicted
943 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
944 #define FF_SI_TYPE 5 ///< Switching Intra
945 #define FF_SP_TYPE 6 ///< Switching Predicted
948 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
949 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
950 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
951 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
953 typedef struct AVPacket {
955 * Presentation timestamp in AVStream->time_base units; the time at which
956 * the decompressed packet will be presented to the user.
957 * Can be AV_NOPTS_VALUE if it is not stored in the file.
958 * pts MUST be larger or equal to dts as presentation cannot happen before
959 * decompression, unless one wants to view hex dumps. Some formats misuse
960 * the terms dts and pts/cts to mean something different. Such timestamps
961 * must be converted to true pts/dts before they are stored in AVPacket.
965 * Decompression timestamp in AVStream->time_base units; the time at which
966 * the packet is decompressed.
967 * Can be AV_NOPTS_VALUE if it is not stored in the file.
975 * Duration of this packet in AVStream->time_base units, 0 if unknown.
976 * Equals next_pts - this_pts in presentation order.
979 void (*destruct)(struct AVPacket *);
981 int64_t pos; ///< byte position in stream, -1 if unknown
984 * Time difference in AVStream->time_base units from the pts of this
985 * packet to the point at which the output from the decoder has converged
986 * independent from the availability of previous frames. That is, the
987 * frames are virtually identical no matter if decoding started from
988 * the very first frame or from this keyframe.
989 * Is AV_NOPTS_VALUE if unknown.
990 * This field is not the display duration of the current packet.
992 * The purpose of this field is to allow seeking in streams that have no
993 * keyframes in the conventional sense. It corresponds to the
994 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
995 * essential for some types of subtitle streams to ensure that all
996 * subtitles are correctly displayed after seeking.
998 int64_t convergence_duration;
1000 #define AV_PKT_FLAG_KEY 0x0001
1001 #if LIBAVCODEC_VERSION_MAJOR < 53
1002 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1006 * Audio Video Frame.
1007 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1009 * Removal, reordering and changes to existing fields require a major
1010 * version bump. No fields should be added into AVFrame before or after
1012 * sizeof(AVFrame) must not be used outside libav*.
1014 typedef struct AVFrame {
1019 * main external API structure.
1020 * New fields can be added to the end with minor version bumps.
1021 * Removal, reordering and changes to existing fields require a major
1023 * sizeof(AVCodecContext) must not be used outside libav*.
1025 typedef struct AVCodecContext {
1027 * information on struct for av_log
1028 * - set by avcodec_alloc_context
1030 const AVClass *av_class;
1032 * the average bitrate
1033 * - encoding: Set by user; unused for constant quantizer encoding.
1034 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1039 * number of bits the bitstream is allowed to diverge from the reference.
1040 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1041 * - encoding: Set by user; unused for constant quantizer encoding.
1042 * - decoding: unused
1044 int bit_rate_tolerance;
1048 * - encoding: Set by user.
1049 * - decoding: Set by user.
1054 * Some codecs need additional format info. It is stored here.
1055 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1056 * specific codec MUST set it correctly otherwise stream copy breaks.
1057 * In general use of this field by muxers is not recommanded.
1058 * - encoding: Set by libavcodec.
1059 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1064 * Motion estimation algorithm used for video coding.
1065 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1066 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1067 * - encoding: MUST be set by user.
1068 * - decoding: unused
1073 * some codecs need / can use extradata like Huffman tables.
1074 * mjpeg: Huffman tables
1075 * rv10: additional flags
1076 * mpeg4: global headers (they can be in the bitstream or here)
1077 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1078 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1079 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1080 * - encoding: Set/allocated/freed by libavcodec.
1081 * - decoding: Set/allocated/freed by user.
1087 * This is the fundamental unit of time (in seconds) in terms
1088 * of which frame timestamps are represented. For fixed-fps content,
1089 * timebase should be 1/framerate and timestamp increments should be
1091 * - encoding: MUST be set by user.
1092 * - decoding: Set by libavcodec.
1094 AVRational time_base;
1098 * picture width / height.
1099 * - encoding: MUST be set by user.
1100 * - decoding: Set by libavcodec.
1101 * Note: For compatibility it is possible to set this instead of
1102 * coded_width/height before decoding.
1106 #define FF_ASPECT_EXTENDED 15
1109 * the number of pictures in a group of pictures, or 0 for intra_only
1110 * - encoding: Set by user.
1111 * - decoding: unused
1116 * Pixel format, see PIX_FMT_xxx.
1117 * - encoding: Set by user.
1118 * - decoding: Set by libavcodec.
1120 enum PixelFormat pix_fmt;
1123 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1124 * has to read frames at native frame rate.
1125 * - encoding: Set by user.
1126 * - decoding: unused
1131 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1132 * decoder to draw a horizontal band. It improves cache usage. Not
1133 * all codecs can do that. You must check the codec capabilities
1135 * The function is also used by hardware acceleration APIs.
1136 * It is called at least once during frame decoding to pass
1137 * the data needed for hardware render.
1138 * In that mode instead of pixel data, AVFrame points to
1139 * a structure specific to the acceleration API. The application
1140 * reads the structure and can change some fields to indicate progress
1142 * - encoding: unused
1143 * - decoding: Set by user.
1144 * @param height the height of the slice
1145 * @param y the y position of the slice
1146 * @param type 1->top field, 2->bottom field, 3->frame
1147 * @param offset offset into the AVFrame.data from which the slice should be read
1149 void (*draw_horiz_band)(struct AVCodecContext *s,
1150 const AVFrame *src, int offset[4],
1151 int y, int type, int height);
1154 int sample_rate; ///< samples per second
1155 int channels; ///< number of audio channels
1158 * audio sample format
1159 * - encoding: Set by user.
1160 * - decoding: Set by libavcodec.
1162 enum SampleFormat sample_fmt; ///< sample format
1164 /* The following data should not be initialized. */
1166 * Samples per packet, initialized when calling 'init'.
1169 int frame_number; ///< audio or video frame number
1170 #if LIBAVCODEC_VERSION_MAJOR < 53
1171 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1175 * Number of frames the decoded output will be delayed relative to
1176 * the encoded input.
1177 * - encoding: Set by libavcodec.
1178 * - decoding: unused
1182 /* - encoding parameters */
1183 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1184 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1188 * - encoding: Set by user.
1189 * - decoding: unused
1195 * - encoding: Set by user.
1196 * - decoding: unused
1201 * maximum quantizer difference between frames
1202 * - encoding: Set by user.
1203 * - decoding: unused
1208 * maximum number of B-frames between non-B-frames
1209 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1210 * - encoding: Set by user.
1211 * - decoding: unused
1216 * qscale factor between IP and B-frames
1217 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1218 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1219 * - encoding: Set by user.
1220 * - decoding: unused
1222 float b_quant_factor;
1224 /** obsolete FIXME remove */
1226 #define FF_RC_STRATEGY_XVID 1
1228 int b_frame_strategy;
1232 * - encoding: unused
1233 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1234 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1238 struct AVCodec *codec;
1242 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1243 /* do its best to deliver a chunk with size */
1244 /* below rtp_payload_size, the chunk will start */
1245 /* with a start code on some codecs like H.263. */
1246 /* This doesn't take account of any particular */
1247 /* headers inside the transmitted RTP payload. */
1250 /* The RTP callback: This function is called */
1251 /* every time the encoder has a packet to send. */
1252 /* It depends on the encoder if the data starts */
1253 /* with a Start Code (it should). H.263 does. */
1254 /* mb_nb contains the number of macroblocks */
1255 /* encoded in the RTP payload. */
1256 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1258 /* statistics, used for 2-pass encoding */
1269 * number of bits used for the previously encoded frame
1270 * - encoding: Set by libavcodec.
1271 * - decoding: unused
1276 * Private data of the user, can be used to carry app specific stuff.
1277 * - encoding: Set by user.
1278 * - decoding: Set by user.
1282 char codec_name[32];
1283 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1284 enum CodecID codec_id; /* see CODEC_ID_xxx */
1287 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1288 * This is used to work around some encoder bugs.
1289 * A demuxer should set this to what is stored in the field used to identify the codec.
1290 * If there are multiple such fields in a container then the demuxer should choose the one
1291 * which maximizes the information about the used codec.
1292 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1293 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1294 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1296 * - encoding: Set by user, if not then the default based on codec_id will be used.
1297 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1299 unsigned int codec_tag;
1302 * Work around bugs in encoders which sometimes cannot be detected automatically.
1303 * - encoding: Set by user
1304 * - decoding: Set by user
1306 int workaround_bugs;
1307 #define FF_BUG_AUTODETECT 1 ///< autodetection
1308 #define FF_BUG_OLD_MSMPEG4 2
1309 #define FF_BUG_XVID_ILACE 4
1310 #define FF_BUG_UMP4 8
1311 #define FF_BUG_NO_PADDING 16
1312 #define FF_BUG_AMV 32
1313 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1314 #define FF_BUG_QPEL_CHROMA 64
1315 #define FF_BUG_STD_QPEL 128
1316 #define FF_BUG_QPEL_CHROMA2 256
1317 #define FF_BUG_DIRECT_BLOCKSIZE 512
1318 #define FF_BUG_EDGE 1024
1319 #define FF_BUG_HPEL_CHROMA 2048
1320 #define FF_BUG_DC_CLIP 4096
1321 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1322 #define FF_BUG_TRUNCATED 16384
1323 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1326 * luma single coefficient elimination threshold
1327 * - encoding: Set by user.
1328 * - decoding: unused
1330 int luma_elim_threshold;
1333 * chroma single coeff elimination threshold
1334 * - encoding: Set by user.
1335 * - decoding: unused
1337 int chroma_elim_threshold;
1340 * strictly follow the standard (MPEG4, ...).
1341 * - encoding: Set by user.
1342 * - decoding: Set by user.
1343 * Setting this to STRICT or higher means the encoder and decoder will
1344 * generally do stupid things. While setting it to inofficial or lower
1345 * will mean the encoder might use things that are not supported by all
1346 * spec compliant decoders. Decoders make no difference between normal,
1347 * inofficial and experimental, that is they always try to decode things
1348 * when they can unless they are explicitly asked to behave stupid
1349 * (=strictly conform to the specs)
1351 int strict_std_compliance;
1352 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1353 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1354 #define FF_COMPLIANCE_NORMAL 0
1355 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1356 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1359 * qscale offset between IP and B-frames
1360 * - encoding: Set by user.
1361 * - decoding: unused
1363 float b_quant_offset;
1366 * Error recognization; higher values will detect more errors but may
1367 * misdetect some more or less valid parts as errors.
1368 * - encoding: unused
1369 * - decoding: Set by user.
1371 int error_recognition;
1372 #define FF_ER_CAREFUL 1
1373 #define FF_ER_COMPLIANT 2
1374 #define FF_ER_AGGRESSIVE 3
1375 #define FF_ER_VERY_AGGRESSIVE 4
1378 * Called at the beginning of each frame to get a buffer for it.
1379 * If pic.reference is set then the frame will be read later by libavcodec.
1380 * avcodec_align_dimensions2() should be used to find the required width and
1381 * height, as they normally need to be rounded up to the next multiple of 16.
1382 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1383 * avcodec_default_get_buffer() instead of providing buffers allocated by
1385 * - encoding: unused
1386 * - decoding: Set by libavcodec., user can override.
1388 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1391 * Called to release buffers which were allocated with get_buffer.
1392 * A released buffer can be reused in get_buffer().
1393 * pic.data[*] must be set to NULL.
1394 * - encoding: unused
1395 * - decoding: Set by libavcodec., user can override.
1397 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1400 * Size of the frame reordering buffer in the decoder.
1401 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1402 * - encoding: Set by libavcodec.
1403 * - decoding: Set by libavcodec.
1408 * number of bytes per packet if constant and known or 0
1409 * Used by some WAV based audio codecs.
1413 int parse_only; /* - decoding only: If true, only parsing is done
1414 (function avcodec_parse_frame()). The frame
1415 data is returned. Only MPEG codecs support this now. */
1418 * 0-> h263 quant 1-> mpeg quant
1419 * - encoding: Set by user.
1420 * - decoding: unused
1425 * pass1 encoding statistics output buffer
1426 * - encoding: Set by libavcodec.
1427 * - decoding: unused
1432 * pass2 encoding statistics input buffer
1433 * Concatenated stuff from stats_out of pass1 should be placed here.
1434 * - encoding: Allocated/set/freed by user.
1435 * - decoding: unused
1440 * ratecontrol qmin qmax limiting method
1441 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1442 * - encoding: Set by user.
1443 * - decoding: unused
1451 * ratecontrol override, see RcOverride
1452 * - encoding: Allocated/set/freed by user.
1453 * - decoding: unused
1455 RcOverride *rc_override;
1456 int rc_override_count;
1459 * rate control equation
1460 * - encoding: Set by user
1461 * - decoding: unused
1467 * - encoding: Set by user.
1468 * - decoding: unused
1474 * - encoding: Set by user.
1475 * - decoding: unused
1480 * decoder bitstream buffer size
1481 * - encoding: Set by user.
1482 * - decoding: unused
1485 float rc_buffer_aggressivity;
1488 * qscale factor between P and I-frames
1489 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1490 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1491 * - encoding: Set by user.
1492 * - decoding: unused
1494 float i_quant_factor;
1497 * qscale offset between P and I-frames
1498 * - encoding: Set by user.
1499 * - decoding: unused
1501 float i_quant_offset;
1504 * initial complexity for pass1 ratecontrol
1505 * - encoding: Set by user.
1506 * - decoding: unused
1508 float rc_initial_cplx;
1511 * DCT algorithm, see FF_DCT_* below
1512 * - encoding: Set by user.
1513 * - decoding: unused
1516 #define FF_DCT_AUTO 0
1517 #define FF_DCT_FASTINT 1
1518 #define FF_DCT_INT 2
1519 #define FF_DCT_MMX 3
1520 #define FF_DCT_MLIB 4
1521 #define FF_DCT_ALTIVEC 5
1522 #define FF_DCT_FAAN 6
1525 * luminance masking (0-> disabled)
1526 * - encoding: Set by user.
1527 * - decoding: unused
1532 * temporary complexity masking (0-> disabled)
1533 * - encoding: Set by user.
1534 * - decoding: unused
1536 float temporal_cplx_masking;
1539 * spatial complexity masking (0-> disabled)
1540 * - encoding: Set by user.
1541 * - decoding: unused
1543 float spatial_cplx_masking;
1546 * p block masking (0-> disabled)
1547 * - encoding: Set by user.
1548 * - decoding: unused
1553 * darkness masking (0-> disabled)
1554 * - encoding: Set by user.
1555 * - decoding: unused
1560 * IDCT algorithm, see FF_IDCT_* below.
1561 * - encoding: Set by user.
1562 * - decoding: Set by user.
1565 #define FF_IDCT_AUTO 0
1566 #define FF_IDCT_INT 1
1567 #define FF_IDCT_SIMPLE 2
1568 #define FF_IDCT_SIMPLEMMX 3
1569 #define FF_IDCT_LIBMPEG2MMX 4
1570 #define FF_IDCT_PS2 5
1571 #define FF_IDCT_MLIB 6
1572 #define FF_IDCT_ARM 7
1573 #define FF_IDCT_ALTIVEC 8
1574 #define FF_IDCT_SH4 9
1575 #define FF_IDCT_SIMPLEARM 10
1576 #define FF_IDCT_H264 11
1577 #define FF_IDCT_VP3 12
1578 #define FF_IDCT_IPP 13
1579 #define FF_IDCT_XVIDMMX 14
1580 #define FF_IDCT_CAVS 15
1581 #define FF_IDCT_SIMPLEARMV5TE 16
1582 #define FF_IDCT_SIMPLEARMV6 17
1583 #define FF_IDCT_SIMPLEVIS 18
1584 #define FF_IDCT_WMV2 19
1585 #define FF_IDCT_FAAN 20
1586 #define FF_IDCT_EA 21
1587 #define FF_IDCT_SIMPLENEON 22
1588 #define FF_IDCT_SIMPLEALPHA 23
1589 #define FF_IDCT_BINK 24
1593 * - encoding: Set by libavcodec.
1594 * - decoding: Set by user (or 0).
1598 * slice offsets in the frame in bytes
1599 * - encoding: Set/allocated by libavcodec.
1600 * - decoding: Set/allocated by user (or NULL).
1605 * error concealment flags
1606 * - encoding: unused
1607 * - decoding: Set by user.
1609 int error_concealment;
1610 #define FF_EC_GUESS_MVS 1
1611 #define FF_EC_DEBLOCK 2
1614 * dsp_mask could be add used to disable unwanted CPU features
1615 * CPU features (i.e. MMX, SSE. ...)
1617 * With the FORCE flag you may instead enable given CPU features.
1618 * (Dangerous: Usable in case of misdetection, improper usage however will
1619 * result into program crash.)
1622 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1623 /* lower 16 bits - CPU features */
1624 #define FF_MM_MMX 0x0001 ///< standard MMX
1625 #define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
1626 #if LIBAVCODEC_VERSION_MAJOR < 53
1627 #define FF_MM_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
1629 #define FF_MM_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
1630 #define FF_MM_SSE 0x0008 ///< SSE functions
1631 #define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
1632 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1633 #define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
1634 #define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
1635 #define FF_MM_SSE4 0x0100 ///< Penryn SSE4.1 functions
1636 #define FF_MM_SSE42 0x0200 ///< Nehalem SSE4.2 functions
1637 #define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
1638 #define FF_MM_ALTIVEC 0x0001 ///< standard AltiVec
1641 * bits per sample/pixel from the demuxer (needed for huffyuv).
1642 * - encoding: Set by libavcodec.
1643 * - decoding: Set by user.
1645 int bits_per_coded_sample;
1648 * prediction method (needed for huffyuv)
1649 * - encoding: Set by user.
1650 * - decoding: unused
1652 int prediction_method;
1653 #define FF_PRED_LEFT 0
1654 #define FF_PRED_PLANE 1
1655 #define FF_PRED_MEDIAN 2
1658 * sample aspect ratio (0 if unknown)
1659 * That is the width of a pixel divided by the height of the pixel.
1660 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1661 * - encoding: Set by user.
1662 * - decoding: Set by libavcodec.
1664 AVRational sample_aspect_ratio;
1667 * the picture in the bitstream
1668 * - encoding: Set by libavcodec.
1669 * - decoding: Set by libavcodec.
1671 AVFrame *coded_frame;
1675 * - encoding: Set by user.
1676 * - decoding: Set by user.
1679 #define FF_DEBUG_PICT_INFO 1
1680 #define FF_DEBUG_RC 2
1681 #define FF_DEBUG_BITSTREAM 4
1682 #define FF_DEBUG_MB_TYPE 8
1683 #define FF_DEBUG_QP 16
1684 #define FF_DEBUG_MV 32
1685 #define FF_DEBUG_DCT_COEFF 0x00000040
1686 #define FF_DEBUG_SKIP 0x00000080
1687 #define FF_DEBUG_STARTCODE 0x00000100
1688 #define FF_DEBUG_PTS 0x00000200
1689 #define FF_DEBUG_ER 0x00000400
1690 #define FF_DEBUG_MMCO 0x00000800
1691 #define FF_DEBUG_BUGS 0x00001000
1692 #define FF_DEBUG_VIS_QP 0x00002000
1693 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1694 #define FF_DEBUG_BUFFERS 0x00008000
1698 * - encoding: Set by user.
1699 * - decoding: Set by user.
1702 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1703 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1704 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1708 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1709 * - decoding: unused
1714 * minimum MB quantizer
1715 * - encoding: unused
1716 * - decoding: unused
1721 * maximum MB quantizer
1722 * - encoding: unused
1723 * - decoding: unused
1728 * motion estimation comparison function
1729 * - encoding: Set by user.
1730 * - decoding: unused
1734 * subpixel motion estimation comparison function
1735 * - encoding: Set by user.
1736 * - decoding: unused
1740 * macroblock comparison function (not supported yet)
1741 * - encoding: Set by user.
1742 * - decoding: unused
1746 * interlaced DCT comparison function
1747 * - encoding: Set by user.
1748 * - decoding: unused
1751 #define FF_CMP_SAD 0
1752 #define FF_CMP_SSE 1
1753 #define FF_CMP_SATD 2
1754 #define FF_CMP_DCT 3
1755 #define FF_CMP_PSNR 4
1756 #define FF_CMP_BIT 5
1758 #define FF_CMP_ZERO 7
1759 #define FF_CMP_VSAD 8
1760 #define FF_CMP_VSSE 9
1761 #define FF_CMP_NSSE 10
1762 #define FF_CMP_W53 11
1763 #define FF_CMP_W97 12
1764 #define FF_CMP_DCTMAX 13
1765 #define FF_CMP_DCT264 14
1766 #define FF_CMP_CHROMA 256
1769 * ME diamond size & shape
1770 * - encoding: Set by user.
1771 * - decoding: unused
1776 * amount of previous MV predictors (2a+1 x 2a+1 square)
1777 * - encoding: Set by user.
1778 * - decoding: unused
1780 int last_predictor_count;
1783 * prepass for motion estimation
1784 * - encoding: Set by user.
1785 * - decoding: unused
1790 * motion estimation prepass comparison function
1791 * - encoding: Set by user.
1792 * - decoding: unused
1797 * ME prepass diamond size & shape
1798 * - encoding: Set by user.
1799 * - decoding: unused
1805 * - encoding: Set by user.
1806 * - decoding: unused
1808 int me_subpel_quality;
1811 * callback to negotiate the pixelFormat
1812 * @param fmt is the list of formats which are supported by the codec,
1813 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1814 * The first is always the native one.
1815 * @return the chosen format
1816 * - encoding: unused
1817 * - decoding: Set by user, if not set the native format will be chosen.
1819 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1822 * DTG active format information (additional aspect ratio
1823 * information only used in DVB MPEG-2 transport streams)
1826 * - encoding: unused
1827 * - decoding: Set by decoder.
1829 int dtg_active_format;
1830 #define FF_DTG_AFD_SAME 8
1831 #define FF_DTG_AFD_4_3 9
1832 #define FF_DTG_AFD_16_9 10
1833 #define FF_DTG_AFD_14_9 11
1834 #define FF_DTG_AFD_4_3_SP_14_9 13
1835 #define FF_DTG_AFD_16_9_SP_14_9 14
1836 #define FF_DTG_AFD_SP_4_3 15
1839 * maximum motion estimation search range in subpel units
1840 * If 0 then no limit.
1842 * - encoding: Set by user.
1843 * - decoding: unused
1848 * intra quantizer bias
1849 * - encoding: Set by user.
1850 * - decoding: unused
1852 int intra_quant_bias;
1853 #define FF_DEFAULT_QUANT_BIAS 999999
1856 * inter quantizer bias
1857 * - encoding: Set by user.
1858 * - decoding: unused
1860 int inter_quant_bias;
1864 * - encoding: unused
1865 * - decoding: Which clrtable should be used for 8bit RGB images.
1866 * Tables have to be stored somewhere. FIXME
1871 * internal_buffer count
1872 * Don't touch, used by libavcodec default_get_buffer().
1874 int internal_buffer_count;
1878 * Don't touch, used by libavcodec default_get_buffer().
1880 void *internal_buffer;
1882 #define FF_LAMBDA_SHIFT 7
1883 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1884 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1885 #define FF_LAMBDA_MAX (256*128-1)
1887 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1889 * Global quality for codecs which cannot change it per frame.
1890 * This should be proportional to MPEG-1/2/4 qscale.
1891 * - encoding: Set by user.
1892 * - decoding: unused
1896 #define FF_CODER_TYPE_VLC 0
1897 #define FF_CODER_TYPE_AC 1
1898 #define FF_CODER_TYPE_RAW 2
1899 #define FF_CODER_TYPE_RLE 3
1900 #define FF_CODER_TYPE_DEFLATE 4
1903 * - encoding: Set by user.
1904 * - decoding: unused
1910 * - encoding: Set by user.
1911 * - decoding: unused
1917 * - encoding: unused
1918 * - decoding: Set by user.
1920 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1925 * - encoding: unused
1926 * - decoding: Set by user.
1929 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1930 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1931 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1934 * XVideo Motion Acceleration
1935 * - encoding: forbidden
1936 * - decoding: set by decoder
1938 int xvmc_acceleration;
1941 * macroblock decision mode
1942 * - encoding: Set by user.
1943 * - decoding: unused
1946 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1947 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1948 #define FF_MB_DECISION_RD 2 ///< rate distortion
1951 * custom intra quantization matrix
1952 * - encoding: Set by user, can be NULL.
1953 * - decoding: Set by libavcodec.
1955 uint16_t *intra_matrix;
1958 * custom inter quantization matrix
1959 * - encoding: Set by user, can be NULL.
1960 * - decoding: Set by libavcodec.
1962 uint16_t *inter_matrix;
1965 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1966 * This is used to work around some encoder bugs.
1967 * - encoding: unused
1968 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1970 unsigned int stream_codec_tag;
1973 * scene change detection threshold
1974 * 0 is default, larger means fewer detected scene changes.
1975 * - encoding: Set by user.
1976 * - decoding: unused
1978 int scenechange_threshold;
1981 * minimum Lagrange multipler
1982 * - encoding: Set by user.
1983 * - decoding: unused
1988 * maximum Lagrange multipler
1989 * - encoding: Set by user.
1990 * - decoding: unused
1995 * palette control structure
1996 * - encoding: ??? (no palette-enabled encoder yet)
1997 * - decoding: Set by user.
1999 struct AVPaletteControl *palctrl;
2002 * noise reduction strength
2003 * - encoding: Set by user.
2004 * - decoding: unused
2006 int noise_reduction;
2009 * Called at the beginning of a frame to get cr buffer for it.
2010 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2011 * libavcodec will pass previous buffer in pic, function should return
2012 * same buffer or new buffer with old frame "painted" into it.
2013 * If pic.data[0] == NULL must behave like get_buffer().
2014 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2015 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2017 * - encoding: unused
2018 * - decoding: Set by libavcodec., user can override
2020 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2023 * Number of bits which should be loaded into the rc buffer before decoding starts.
2024 * - encoding: Set by user.
2025 * - decoding: unused
2027 int rc_initial_buffer_occupancy;
2031 * - encoding: Set by user.
2032 * - decoding: unused
2034 int inter_threshold;
2038 * - encoding: Set by user.
2039 * - decoding: Set by user.
2044 * Simulates errors in the bitstream to test error concealment.
2045 * - encoding: Set by user.
2046 * - decoding: unused
2051 * MP3 antialias algorithm, see FF_AA_* below.
2052 * - encoding: unused
2053 * - decoding: Set by user.
2056 #define FF_AA_AUTO 0
2057 #define FF_AA_FASTINT 1 //not implemented yet
2059 #define FF_AA_FLOAT 3
2061 * quantizer noise shaping
2062 * - encoding: Set by user.
2063 * - decoding: unused
2065 int quantizer_noise_shaping;
2069 * is used to decide how many independent tasks should be passed to execute()
2070 * - encoding: Set by user.
2071 * - decoding: Set by user.
2076 * The codec may call this to execute several independent things.
2077 * It will return only after finishing all tasks.
2078 * The user may replace this with some multithreaded implementation,
2079 * the default implementation will execute the parts serially.
2080 * @param count the number of things to execute
2081 * - encoding: Set by libavcodec, user can override.
2082 * - decoding: Set by libavcodec, user can override.
2084 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2088 * Can be used by execute() to store some per AVCodecContext stuff.
2089 * - encoding: set by execute()
2090 * - decoding: set by execute()
2092 void *thread_opaque;
2095 * Motion estimation threshold below which no motion estimation is
2096 * performed, but instead the user specified motion vectors are used.
2098 * - encoding: Set by user.
2099 * - decoding: unused
2104 * Macroblock threshold below which the user specified macroblock types will be used.
2105 * - encoding: Set by user.
2106 * - decoding: unused
2111 * precision of the intra DC coefficient - 8
2112 * - encoding: Set by user.
2113 * - decoding: unused
2115 int intra_dc_precision;
2118 * noise vs. sse weight for the nsse comparsion function
2119 * - encoding: Set by user.
2120 * - decoding: unused
2125 * Number of macroblock rows at the top which are skipped.
2126 * - encoding: unused
2127 * - decoding: Set by user.
2132 * Number of macroblock rows at the bottom which are skipped.
2133 * - encoding: unused
2134 * - decoding: Set by user.
2140 * - encoding: Set by user.
2141 * - decoding: Set by libavcodec.
2144 #define FF_PROFILE_UNKNOWN -99
2146 #define FF_PROFILE_AAC_MAIN 0
2147 #define FF_PROFILE_AAC_LOW 1
2148 #define FF_PROFILE_AAC_SSR 2
2149 #define FF_PROFILE_AAC_LTP 3
2151 #define FF_PROFILE_H264_BASELINE 66
2152 #define FF_PROFILE_H264_MAIN 77
2153 #define FF_PROFILE_H264_EXTENDED 88
2154 #define FF_PROFILE_H264_HIGH 100
2155 #define FF_PROFILE_H264_HIGH_10 110
2156 #define FF_PROFILE_H264_HIGH_422 122
2157 #define FF_PROFILE_H264_HIGH_444 244
2158 #define FF_PROFILE_H264_CAVLC_444 44
2162 * - encoding: Set by user.
2163 * - decoding: Set by libavcodec.
2166 #define FF_LEVEL_UNKNOWN -99
2169 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2170 * - encoding: unused
2171 * - decoding: Set by user.
2176 * Bitstream width / height, may be different from width/height if lowres
2177 * or other things are used.
2178 * - encoding: unused
2179 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2181 int coded_width, coded_height;
2184 * frame skip threshold
2185 * - encoding: Set by user.
2186 * - decoding: unused
2188 int frame_skip_threshold;
2192 * - encoding: Set by user.
2193 * - decoding: unused
2195 int frame_skip_factor;
2198 * frame skip exponent
2199 * - encoding: Set by user.
2200 * - decoding: unused
2205 * frame skip comparison function
2206 * - encoding: Set by user.
2207 * - decoding: unused
2212 * Border processing masking, raises the quantizer for mbs on the borders
2214 * - encoding: Set by user.
2215 * - decoding: unused
2217 float border_masking;
2220 * minimum MB lagrange multipler
2221 * - encoding: Set by user.
2222 * - decoding: unused
2227 * maximum MB lagrange multipler
2228 * - encoding: Set by user.
2229 * - decoding: unused
2235 * - encoding: Set by user.
2236 * - decoding: unused
2238 int me_penalty_compensation;
2242 * - encoding: unused
2243 * - decoding: Set by user.
2245 enum AVDiscard skip_loop_filter;
2249 * - encoding: unused
2250 * - decoding: Set by user.
2252 enum AVDiscard skip_idct;
2256 * - encoding: unused
2257 * - decoding: Set by user.
2259 enum AVDiscard skip_frame;
2263 * - encoding: Set by user.
2264 * - decoding: unused
2270 * - encoding: Set by user.
2271 * - decoding: unused
2276 * constant rate factor - quality-based VBR - values ~correspond to qps
2277 * - encoding: Set by user.
2278 * - decoding: unused
2283 * constant quantization parameter rate control method
2284 * - encoding: Set by user.
2285 * - decoding: unused
2291 * - encoding: Set by user.
2292 * - decoding: unused
2297 * number of reference frames
2298 * - encoding: Set by user.
2299 * - decoding: Set by lavc.
2304 * chroma qp offset from luma
2305 * - encoding: Set by user.
2306 * - decoding: unused
2311 * Influences how often B-frames are used.
2312 * - encoding: Set by user.
2313 * - decoding: unused
2318 * trellis RD quantization
2319 * - encoding: Set by user.
2320 * - decoding: unused
2325 * Reduce fluctuations in qp (before curve compression).
2326 * - encoding: Set by user.
2327 * - decoding: unused
2329 float complexityblur;
2332 * in-loop deblocking filter alphac0 parameter
2333 * alpha is in the range -6...6
2334 * - encoding: Set by user.
2335 * - decoding: unused
2340 * in-loop deblocking filter beta parameter
2341 * beta is in the range -6...6
2342 * - encoding: Set by user.
2343 * - decoding: unused
2348 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2349 * - encoding: Set by user.
2350 * - decoding: unused
2353 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2354 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2355 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2356 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2357 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2360 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2361 * - encoding: Set by user.
2362 * - decoding: unused
2367 * Audio cutoff bandwidth (0 means "automatic")
2368 * - encoding: Set by user.
2369 * - decoding: unused
2374 * Multiplied by qscale for each frame and added to scene_change_score.
2375 * - encoding: Set by user.
2376 * - decoding: unused
2378 int scenechange_factor;
2382 * Note: Value depends upon the compare function used for fullpel ME.
2383 * - encoding: Set by user.
2384 * - decoding: unused
2389 * Adjusts sensitivity of b_frame_strategy 1.
2390 * - encoding: Set by user.
2391 * - decoding: unused
2396 * - encoding: Set by user.
2397 * - decoding: unused
2399 int compression_level;
2400 #define FF_COMPRESSION_DEFAULT -1
2403 * Sets whether to use LPC mode - used by FLAC encoder.
2404 * - encoding: Set by user.
2405 * - decoding: unused
2410 * LPC coefficient precision - used by FLAC encoder
2411 * - encoding: Set by user.
2412 * - decoding: unused
2414 int lpc_coeff_precision;
2417 * - encoding: Set by user.
2418 * - decoding: unused
2420 int min_prediction_order;
2423 * - encoding: Set by user.
2424 * - decoding: unused
2426 int max_prediction_order;
2429 * search method for selecting prediction order
2430 * - encoding: Set by user.
2431 * - decoding: unused
2433 int prediction_order_method;
2436 * - encoding: Set by user.
2437 * - decoding: unused
2439 int min_partition_order;
2442 * - encoding: Set by user.
2443 * - decoding: unused
2445 int max_partition_order;
2448 * GOP timecode frame start number, in non drop frame format
2449 * - encoding: Set by user.
2450 * - decoding: unused
2452 int64_t timecode_frame_start;
2454 #if LIBAVCODEC_VERSION_MAJOR < 53
2456 * Decoder should decode to this many channels if it can (0 for default)
2457 * - encoding: unused
2458 * - decoding: Set by user.
2459 * @deprecated Deprecated in favor of request_channel_layout.
2461 int request_channels;
2465 * Percentage of dynamic range compression to be applied by the decoder.
2466 * The default value is 1.0, corresponding to full compression.
2467 * - encoding: unused
2468 * - decoding: Set by user.
2473 * opaque 64bit number (generally a PTS) that will be reordered and
2474 * output in AVFrame.reordered_opaque
2475 * - encoding: unused
2476 * - decoding: Set by user.
2478 int64_t reordered_opaque;
2481 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2482 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2483 * - encoding: set by user.
2484 * - decoding: set by libavcodec.
2486 int bits_per_raw_sample;
2489 * Audio channel layout.
2490 * - encoding: set by user.
2491 * - decoding: set by libavcodec.
2493 int64_t channel_layout;
2496 * Request decoder to use this channel layout if it can (0 for default)
2497 * - encoding: unused
2498 * - decoding: Set by user.
2500 int64_t request_channel_layout;
2503 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2504 * - encoding: Set by user.
2505 * - decoding: unused.
2507 float rc_max_available_vbv_use;
2510 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2511 * - encoding: Set by user.
2512 * - decoding: unused.
2514 float rc_min_vbv_overflow_use;
2517 * Hardware accelerator in use
2518 * - encoding: unused.
2519 * - decoding: Set by libavcodec
2521 struct AVHWAccel *hwaccel;
2524 * For some codecs, the time base is closer to the field rate than the frame rate.
2525 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2526 * if no telecine is used ...
2528 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2530 int ticks_per_frame;
2533 * Hardware accelerator context.
2534 * For some hardware accelerators, a global context needs to be
2535 * provided by the user. In that case, this holds display-dependent
2536 * data FFmpeg cannot instantiate itself. Please refer to the
2537 * FFmpeg HW accelerator documentation to know how to fill this
2538 * is. e.g. for VA API, this is a struct vaapi_context.
2539 * - encoding: unused
2540 * - decoding: Set by user
2542 void *hwaccel_context;
2545 * Chromaticity coordinates of the source primaries.
2546 * - encoding: Set by user
2547 * - decoding: Set by libavcodec
2549 enum AVColorPrimaries color_primaries;
2552 * Color Transfer Characteristic.
2553 * - encoding: Set by user
2554 * - decoding: Set by libavcodec
2556 enum AVColorTransferCharacteristic color_trc;
2559 * YUV colorspace type.
2560 * - encoding: Set by user
2561 * - decoding: Set by libavcodec
2563 enum AVColorSpace colorspace;
2566 * MPEG vs JPEG YUV range.
2567 * - encoding: Set by user
2568 * - decoding: Set by libavcodec
2570 enum AVColorRange color_range;
2573 * This defines the location of chroma samples.
2574 * - encoding: Set by user
2575 * - decoding: Set by libavcodec
2577 enum AVChromaLocation chroma_sample_location;
2580 * The codec may call this to execute several independent things.
2581 * It will return only after finishing all tasks.
2582 * The user may replace this with some multithreaded implementation,
2583 * the default implementation will execute the parts serially.
2584 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2585 * @param c context passed also to func
2586 * @param count the number of things to execute
2587 * @param arg2 argument passed unchanged to func
2588 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2589 * @param func function that will be called count times, with jobnr from 0 to count-1.
2590 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2591 * two instances of func executing at the same time will have the same threadnr.
2592 * @return always 0 currently, but code should handle a future improvement where when any call to func
2593 * returns < 0 no further calls to func may be done and < 0 is returned.
2594 * - encoding: Set by libavcodec, user can override.
2595 * - decoding: Set by libavcodec, user can override.
2597 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2600 * explicit P-frame weighted prediction analysis method
2602 * 1: fast blind weighting (one reference duplicate with -1 offset)
2603 * 2: smart weighting (full fade detection analysis)
2604 * - encoding: Set by user.
2605 * - decoding: unused
2607 int weighted_p_pred;
2612 * 1: Variance AQ (complexity mask)
2613 * 2: Auto-variance AQ (experimental)
2614 * - encoding: Set by user
2615 * - decoding: unused
2621 * Reduces blocking and blurring in flat and textured areas.
2622 * - encoding: Set by user
2623 * - decoding: unused
2629 * Strength of psychovisual optimization
2630 * - encoding: Set by user
2631 * - decoding: unused
2637 * Strength of psychovisual optimization
2638 * - encoding: Set by user
2639 * - decoding: unused
2645 * Number of frames for frametype and ratecontrol lookahead
2646 * - encoding: Set by user
2647 * - decoding: unused
2652 * Constant rate factor maximum
2653 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2654 * than crf_max, even if doing so would violate VBV restrictions.
2655 * - encoding: Set by user.
2656 * - decoding: unused
2660 int log_level_offset;
2666 typedef struct AVCodec {
2668 * Name of the codec implementation.
2669 * The name is globally unique among encoders and among decoders (but an
2670 * encoder and a decoder can share the same name).
2671 * This is the primary way to find a codec from the user perspective.
2674 enum AVMediaType type;
2677 int (*init)(AVCodecContext *);
2678 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2679 int (*close)(AVCodecContext *);
2680 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2682 * Codec capabilities.
2686 struct AVCodec *next;
2689 * Will be called when seeking
2691 void (*flush)(AVCodecContext *);
2692 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2693 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2695 * Descriptive name for the codec, meant to be more human readable than name.
2696 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2698 const char *long_name;
2699 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2700 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2701 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2707 typedef struct AVHWAccel {
2709 * Name of the hardware accelerated codec.
2710 * The name is globally unique among encoders and among decoders (but an
2711 * encoder and a decoder can share the same name).
2716 * Type of codec implemented by the hardware accelerator.
2718 * See AVMEDIA_TYPE_xxx
2720 enum AVMediaType type;
2723 * Codec implemented by the hardware accelerator.
2730 * Supported pixel format.
2732 * Only hardware accelerated formats are supported here.
2734 enum PixelFormat pix_fmt;
2737 * Hardware accelerated codec capabilities.
2738 * see FF_HWACCEL_CODEC_CAP_*
2742 struct AVHWAccel *next;
2745 * Called at the beginning of each frame or field picture.
2747 * Meaningful frame information (codec specific) is guaranteed to
2748 * be parsed at this point. This function is mandatory.
2750 * Note that buf can be NULL along with buf_size set to 0.
2751 * Otherwise, this means the whole frame is available at this point.
2753 * @param avctx the codec context
2754 * @param buf the frame data buffer base
2755 * @param buf_size the size of the frame in bytes
2756 * @return zero if successful, a negative value otherwise
2758 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2761 * Callback for each slice.
2763 * Meaningful slice information (codec specific) is guaranteed to
2764 * be parsed at this point. This function is mandatory.
2766 * @param avctx the codec context
2767 * @param buf the slice data buffer base
2768 * @param buf_size the size of the slice in bytes
2769 * @return zero if successful, a negative value otherwise
2771 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2774 * Called at the end of each frame or field picture.
2776 * The whole picture is parsed at this point and can now be sent
2777 * to the hardware accelerator. This function is mandatory.
2779 * @param avctx the codec context
2780 * @return zero if successful, a negative value otherwise
2782 int (*end_frame)(AVCodecContext *avctx);
2785 * Size of HW accelerator private data.
2787 * Private data is allocated with av_mallocz() before
2788 * AVCodecContext.get_buffer() and deallocated after
2789 * AVCodecContext.release_buffer().
2795 * four components are given, that's all.
2796 * the last component is alpha
2798 typedef struct AVPicture {
2800 int linesize[4]; ///< number of bytes per line
2803 #if LIBAVCODEC_VERSION_MAJOR < 53
2806 * This structure defines a method for communicating palette changes
2807 * between and demuxer and a decoder.
2809 * @deprecated Use AVPacket to send palette changes instead.
2810 * This is totally broken.
2812 #define AVPALETTE_SIZE 1024
2813 #define AVPALETTE_COUNT 256
2814 typedef struct AVPaletteControl {
2816 /* Demuxer sets this to 1 to indicate the palette has changed;
2817 * decoder resets to 0. */
2818 int palette_changed;
2820 /* 4-byte ARGB palette entries, stored in native byte order; note that
2821 * the individual palette components should be on a 8-bit scale; if
2822 * the palette data comes from an IBM VGA native format, the component
2823 * data is probably 6 bits in size and needs to be scaled. */
2824 unsigned int palette[AVPALETTE_COUNT];
2826 } AVPaletteControl attribute_deprecated;
2829 enum AVSubtitleType {
2832 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2835 * Plain text, the text field must be set by the decoder and is
2836 * authoritative. ass and pict fields may contain approximations.
2841 * Formatted text, the ass field must be set by the decoder and is
2842 * authoritative. pict and text fields may contain approximations.
2847 typedef struct AVSubtitleRect {
2848 int x; ///< top left corner of pict, undefined when pict is not set
2849 int y; ///< top left corner of pict, undefined when pict is not set
2850 int w; ///< width of pict, undefined when pict is not set
2851 int h; ///< height of pict, undefined when pict is not set
2852 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2855 * data+linesize for the bitmap of this subtitle.
2856 * can be set for text/ass as well once they where rendered
2859 enum AVSubtitleType type;
2861 char *text; ///< 0 terminated plain UTF-8 text
2864 * 0 terminated ASS/SSA compatible event line.
2865 * The pressentation of this is unaffected by the other values in this
2871 typedef struct AVSubtitle {
2872 uint16_t format; /* 0 = graphics */
2873 uint32_t start_display_time; /* relative to packet pts, in ms */
2874 uint32_t end_display_time; /* relative to packet pts, in ms */
2876 AVSubtitleRect **rects;
2877 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2880 /* packet functions */
2883 * @deprecated use NULL instead
2885 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2888 * Default packet destructor.
2890 void av_destruct_packet(AVPacket *pkt);
2893 * Initialize optional fields of a packet with default values.
2897 void av_init_packet(AVPacket *pkt);
2900 * Allocate the payload of a packet and initialize its fields with
2904 * @param size wanted payload size
2905 * @return 0 if OK, AVERROR_xxx otherwise
2907 int av_new_packet(AVPacket *pkt, int size);
2910 * Reduce packet size, correctly zeroing padding
2913 * @param size new size
2915 void av_shrink_packet(AVPacket *pkt, int size);
2918 * @warning This is a hack - the packet memory allocation stuff is broken. The
2919 * packet is allocated if it was not really allocated.
2921 int av_dup_packet(AVPacket *pkt);
2926 * @param pkt packet to free
2928 void av_free_packet(AVPacket *pkt);
2932 struct ReSampleContext;
2933 struct AVResampleContext;
2935 typedef struct ReSampleContext ReSampleContext;
2937 #if LIBAVCODEC_VERSION_MAJOR < 53
2939 * @deprecated Use av_audio_resample_init() instead.
2941 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2942 int output_rate, int input_rate);
2945 * Initializes audio resampling context
2947 * @param output_channels number of output channels
2948 * @param input_channels number of input channels
2949 * @param output_rate output sample rate
2950 * @param input_rate input sample rate
2951 * @param sample_fmt_out requested output sample format
2952 * @param sample_fmt_in input sample format
2953 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2954 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2955 * @param linear If 1 then the used FIR filter will be linearly interpolated
2956 between the 2 closest, if 0 the closest will be used
2957 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2958 * @return allocated ReSampleContext, NULL if error occured
2960 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
2961 int output_rate, int input_rate,
2962 enum SampleFormat sample_fmt_out,
2963 enum SampleFormat sample_fmt_in,
2964 int filter_length, int log2_phase_count,
2965 int linear, double cutoff);
2967 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2968 void audio_resample_close(ReSampleContext *s);
2972 * Initializes an audio resampler.
2973 * Note, if either rate is not an integer then simply scale both rates up so they are.
2974 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2975 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2976 * @param linear If 1 then the used FIR filter will be linearly interpolated
2977 between the 2 closest, if 0 the closest will be used
2978 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2980 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2984 * @param src an array of unconsumed samples
2985 * @param consumed the number of samples of src which have been consumed are returned here
2986 * @param src_size the number of unconsumed samples available
2987 * @param dst_size the amount of space in samples available in dst
2988 * @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.
2989 * @return the number of samples written in dst or -1 if an error occurred
2991 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2995 * Compensates samplerate/timestamp drift. The compensation is done by changing
2996 * the resampler parameters, so no audible clicks or similar distortions occur
2997 * @param compensation_distance distance in output samples over which the compensation should be performed
2998 * @param sample_delta number of output samples which should be output less
3000 * example: av_resample_compensate(c, 10, 500)
3001 * here instead of 510 samples only 500 samples would be output
3003 * note, due to rounding the actual compensation might be slightly different,
3004 * especially if the compensation_distance is large and the in_rate used during init is small
3006 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3007 void av_resample_close(struct AVResampleContext *c);
3010 * Allocate memory for a picture. Call avpicture_free to free it.
3012 * @param picture the picture to be filled in
3013 * @param pix_fmt the format of the picture
3014 * @param width the width of the picture
3015 * @param height the height of the picture
3016 * @return zero if successful, a negative value if not
3018 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3021 * Free a picture previously allocated by avpicture_alloc().
3023 * @param picture the AVPicture to be freed
3025 void avpicture_free(AVPicture *picture);
3028 * Fill in the AVPicture fields.
3029 * The fields of the given AVPicture are filled in by using the 'ptr' address
3030 * which points to the image data buffer. Depending on the specified picture
3031 * format, one or multiple image data pointers and line sizes will be set.
3032 * If a planar format is specified, several pointers will be set pointing to
3033 * the different picture planes and the line sizes of the different planes
3034 * will be stored in the lines_sizes array.
3035 * Call with ptr == NULL to get the required size for the ptr buffer.
3037 * @param picture AVPicture whose fields are to be filled in
3038 * @param ptr Buffer which will contain or contains the actual image data
3039 * @param pix_fmt The format in which the picture data is stored.
3040 * @param width the width of the image in pixels
3041 * @param height the height of the image in pixels
3042 * @return size of the image data in bytes
3044 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3045 enum PixelFormat pix_fmt, int width, int height);
3046 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3047 unsigned char *dest, int dest_size);
3050 * Calculate the size in bytes that a picture of the given width and height
3051 * would occupy if stored in the given picture format.
3052 * Note that this returns the size of a compact representation as generated
3053 * by avpicture_layout, which can be smaller than the size required for e.g.
3056 * @param pix_fmt the given picture format
3057 * @param width the width of the image
3058 * @param height the height of the image
3059 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3061 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3062 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3063 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3064 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3066 #if LIBAVCODEC_VERSION_MAJOR < 53
3068 * Returns the pixel format corresponding to the name name.
3070 * If there is no pixel format with name name, then looks for a
3071 * pixel format with the name corresponding to the native endian
3073 * For example in a little-endian system, first looks for "gray16",
3074 * then for "gray16le".
3076 * Finally if no pixel format has been found, returns PIX_FMT_NONE.
3078 * @deprecated Deprecated in favor of av_get_pix_fmt().
3080 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3084 * Returns a value representing the fourCC code associated to the
3085 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3088 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3090 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3091 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3092 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3093 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3094 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3095 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3098 * Computes what kind of losses will occur when converting from one specific
3099 * pixel format to another.
3100 * When converting from one pixel format to another, information loss may occur.
3101 * For example, when converting from RGB24 to GRAY, the color information will
3102 * be lost. Similarly, other losses occur when converting from some formats to
3103 * other formats. These losses can involve loss of chroma, but also loss of
3104 * resolution, loss of color depth, loss due to the color space conversion, loss
3105 * of the alpha bits or loss due to color quantization.
3106 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3107 * which will occur when converting from one pixel format to another.
3109 * @param[in] dst_pix_fmt destination pixel format
3110 * @param[in] src_pix_fmt source pixel format
3111 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3112 * @return Combination of flags informing you what kind of losses will occur.
3114 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3118 * Finds the best pixel format to convert to given a certain source pixel
3119 * format. When converting from one pixel format to another, information loss
3120 * may occur. For example, when converting from RGB24 to GRAY, the color
3121 * information will be lost. Similarly, other losses occur when converting from
3122 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3123 * the given pixel formats should be used to suffer the least amount of loss.
3124 * The pixel formats from which it chooses one, are determined by the
3125 * pix_fmt_mask parameter.
3128 * src_pix_fmt = PIX_FMT_YUV420P;
3129 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3130 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3133 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3134 * @param[in] src_pix_fmt source pixel format
3135 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3136 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3137 * @return The best pixel format to convert to or -1 if none was found.
3139 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3140 int has_alpha, int *loss_ptr);
3144 * Print in buf the string corresponding to the pixel format with
3145 * number pix_fmt, or an header if pix_fmt is negative.
3147 * @param[in] buf the buffer where to write the string
3148 * @param[in] buf_size the size of buf
3149 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3150 * a negative value to print the corresponding header.
3151 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3153 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3155 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3156 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3159 * Tell if an image really has transparent alpha values.
3160 * @return ored mask of FF_ALPHA_xxx constants
3162 int img_get_alpha_info(const AVPicture *src,
3163 enum PixelFormat pix_fmt, int width, int height);
3165 /* deinterlace a picture */
3166 /* deinterlace - if not supported return -1 */
3167 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3168 enum PixelFormat pix_fmt, int width, int height);
3170 /* external high level API */
3173 * If c is NULL, returns the first registered codec,
3174 * if c is non-NULL, returns the next registered codec after c,
3175 * or NULL if c is the last one.
3177 AVCodec *av_codec_next(AVCodec *c);
3180 * Returns the LIBAVCODEC_VERSION_INT constant.
3182 unsigned avcodec_version(void);
3185 * Returns the libavcodec build-time configuration.
3187 const char *avcodec_configuration(void);
3190 * Returns the libavcodec license.
3192 const char *avcodec_license(void);
3195 * Initializes libavcodec.
3197 * @warning This function must be called before any other libavcodec
3200 void avcodec_init(void);
3202 #if LIBAVCODEC_VERSION_MAJOR < 53
3204 * @deprecated Deprecated in favor of avcodec_register().
3206 attribute_deprecated void register_avcodec(AVCodec *codec);
3210 * Register the codec codec and initialize libavcodec.
3212 * @see avcodec_init()
3214 void avcodec_register(AVCodec *codec);
3217 * Finds a registered encoder with a matching codec ID.
3219 * @param id CodecID of the requested encoder
3220 * @return An encoder if one was found, NULL otherwise.
3222 AVCodec *avcodec_find_encoder(enum CodecID id);
3225 * Finds a registered encoder with the specified name.
3227 * @param name name of the requested encoder
3228 * @return An encoder if one was found, NULL otherwise.
3230 AVCodec *avcodec_find_encoder_by_name(const char *name);
3233 * Finds a registered decoder with a matching codec ID.
3235 * @param id CodecID of the requested decoder
3236 * @return A decoder if one was found, NULL otherwise.
3238 AVCodec *avcodec_find_decoder(enum CodecID id);
3241 * Finds a registered decoder with the specified name.
3243 * @param name name of the requested decoder
3244 * @return A decoder if one was found, NULL otherwise.
3246 AVCodec *avcodec_find_decoder_by_name(const char *name);
3247 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3250 * Sets the fields of the given AVCodecContext to default values.
3252 * @param s The AVCodecContext of which the fields should be set to default values.
3254 void avcodec_get_context_defaults(AVCodecContext *s);
3256 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3257 * we WILL change its arguments and name a few times! */
3258 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3261 * Allocates an AVCodecContext and sets its fields to default values. The
3262 * resulting struct can be deallocated by simply calling av_free().
3264 * @return An AVCodecContext filled with default values or NULL on failure.
3265 * @see avcodec_get_context_defaults
3267 AVCodecContext *avcodec_alloc_context(void);
3269 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3270 * we WILL change its arguments and name a few times! */
3271 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3274 * Copy the settings of the source AVCodecContext into the destination
3275 * AVCodecContext. The resulting destination codec context will be
3276 * unopened, i.e. you are required to call avcodec_open() before you
3277 * can use this AVCodecContext to decode/encode video/audio data.
3279 * @param dest target codec context, should be initialized with
3280 * avcodec_alloc_context(), but otherwise uninitialized
3281 * @param src source codec context
3282 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3284 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3287 * Sets the fields of the given AVFrame to default values.
3289 * @param pic The AVFrame of which the fields should be set to default values.
3291 void avcodec_get_frame_defaults(AVFrame *pic);
3294 * Allocates an AVFrame and sets its fields to default values. The resulting
3295 * struct can be deallocated by simply calling av_free().
3297 * @return An AVFrame filled with default values or NULL on failure.
3298 * @see avcodec_get_frame_defaults
3300 AVFrame *avcodec_alloc_frame(void);
3302 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3303 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3304 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3307 * Returns the amount of padding in pixels which the get_buffer callback must
3308 * provide around the edge of the image for codecs which do not have the
3309 * CODEC_FLAG_EMU_EDGE flag.
3311 * @return Required padding in pixels.
3313 unsigned avcodec_get_edge_width(void);
3315 * Modifies width and height values so that they will result in a memory
3316 * buffer that is acceptable for the codec if you do not use any horizontal
3319 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3321 * Modifies width and height values so that they will result in a memory
3322 * buffer that is acceptable for the codec if you also ensure that all
3323 * line sizes are a multiple of the respective linesize_align[i].
3325 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3326 int linesize_align[4]);
3329 * Checks if the given dimension of a picture is valid, meaning that all
3330 * bytes of the picture can be addressed with a signed int.
3332 * @param[in] w Width of the picture.
3333 * @param[in] h Height of the picture.
3334 * @return Zero if valid, a negative value if invalid.
3336 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3337 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3339 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3340 void avcodec_thread_free(AVCodecContext *s);
3341 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3342 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3343 //FIXME func typedef
3346 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
3347 * function the context has to be allocated.
3349 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3350 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3351 * retrieving a codec.
3353 * @warning This function is not thread safe!
3356 * avcodec_register_all();
3357 * codec = avcodec_find_decoder(CODEC_ID_H264);
3361 * context = avcodec_alloc_context();
3363 * if (avcodec_open(context, codec) < 0)
3367 * @param avctx The context which will be set up to use the given codec.
3368 * @param codec The codec to use within the context.
3369 * @return zero on success, a negative value on error
3370 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3372 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3374 #if LIBAVCODEC_VERSION_MAJOR < 53
3376 * Decodes an audio frame from buf into samples.
3377 * Wrapper function which calls avcodec_decode_audio3.
3379 * @deprecated Use avcodec_decode_audio3 instead.
3380 * @param avctx the codec context
3381 * @param[out] samples the output buffer
3382 * @param[in,out] frame_size_ptr the output buffer size in bytes
3383 * @param[in] buf the input buffer
3384 * @param[in] buf_size the input buffer size in bytes
3385 * @return On error a negative value is returned, otherwise the number of bytes
3386 * used or zero if no frame could be decompressed.
3388 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3389 int *frame_size_ptr,
3390 const uint8_t *buf, int buf_size);
3394 * Decodes the audio frame of size avpkt->size from avpkt->data into samples.
3395 * Some decoders may support multiple frames in a single AVPacket, such
3396 * decoders would then just decode the first frame. In this case,
3397 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3398 * the remaining data in order to decode the second frame etc.
3400 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3401 * decompressed frame size in bytes.
3403 * @warning You must set frame_size_ptr to the allocated size of the
3404 * output buffer before calling avcodec_decode_audio3().
3406 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3407 * the actual read bytes because some optimized bitstream readers read 32 or 64
3408 * bits at once and could read over the end.
3410 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3411 * no overreading happens for damaged MPEG streams.
3413 * @note You might have to align the input buffer avpkt->data and output buffer
3414 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3415 * necessary at all, on others it won't work at all if not aligned and on others
3416 * it will work but it will have an impact on performance.
3418 * In practice, avpkt->data should have 4 byte alignment at minimum and
3419 * samples should be 16 byte aligned unless the CPU doesn't need it
3420 * (AltiVec and SSE do).
3422 * @param avctx the codec context
3423 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3424 * @param[in,out] frame_size_ptr the output buffer size in bytes
3425 * @param[in] avpkt The input AVPacket containing the input buffer.
3426 * You can create such packet with av_init_packet() and by then setting
3427 * data and size, some decoders might in addition need other fields.
3428 * All decoders are designed to use the least fields possible though.
3429 * @return On error a negative value is returned, otherwise the number of bytes
3430 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3432 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3433 int *frame_size_ptr,
3436 #if LIBAVCODEC_VERSION_MAJOR < 53
3438 * Decodes a video frame from buf into picture.
3439 * Wrapper function which calls avcodec_decode_video2.
3441 * @deprecated Use avcodec_decode_video2 instead.
3442 * @param avctx the codec context
3443 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3444 * @param[in] buf the input buffer
3445 * @param[in] buf_size the size of the input buffer in bytes
3446 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3447 * @return On error a negative value is returned, otherwise the number of bytes
3448 * used or zero if no frame could be decompressed.
3450 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3451 int *got_picture_ptr,
3452 const uint8_t *buf, int buf_size);
3456 * Decodes the video frame of size avpkt->size from avpkt->data into picture.
3457 * Some decoders may support multiple frames in a single AVPacket, such
3458 * decoders would then just decode the first frame.
3460 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3461 * the actual read bytes because some optimized bitstream readers read 32 or 64
3462 * bits at once and could read over the end.
3464 * @warning The end of the input buffer buf should be set to 0 to ensure that
3465 * no overreading happens for damaged MPEG streams.
3467 * @note You might have to align the input buffer avpkt->data.
3468 * The alignment requirements depend on the CPU: on some CPUs it isn't
3469 * necessary at all, on others it won't work at all if not aligned and on others
3470 * it will work but it will have an impact on performance.
3472 * In practice, avpkt->data should have 4 byte alignment at minimum.
3474 * @note Some codecs have a delay between input and output, these need to be
3475 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3477 * @param avctx the codec context
3478 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3479 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3480 * allocate memory for the actual bitmap.
3481 * @param[in] avpkt The input AVpacket containing the input buffer.
3482 * You can create such packet with av_init_packet() and by then setting
3483 * data and size, some decoders might in addition need other fields like
3484 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3486 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3487 * @return On error a negative value is returned, otherwise the number of bytes
3488 * used or zero if no frame could be decompressed.
3490 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3491 int *got_picture_ptr,
3494 #if LIBAVCODEC_VERSION_MAJOR < 53
3495 /* Decode a subtitle message. Return -1 if error, otherwise return the
3496 * number of bytes used. If no subtitle could be decompressed,
3497 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3498 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3500 const uint8_t *buf, int buf_size);
3504 * Decodes a subtitle message.
3505 * Returns a negative value on error, otherwise returns the number of bytes used.
3506 * If no subtitle could be decompressed, got_sub_ptr is zero.
3507 * Otherwise, the subtitle is stored in *sub.
3509 * @param avctx the codec context
3510 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored.
3511 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3512 * @param[in] avpkt The input AVPacket containing the input buffer.
3514 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3517 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3519 uint8_t *buf, int buf_size);
3522 * Encodes an audio frame from samples into buf.
3524 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3525 * However, for PCM audio the user will know how much space is needed
3526 * because it depends on the value passed in buf_size as described
3527 * below. In that case a lower value can be used.
3529 * @param avctx the codec context
3530 * @param[out] buf the output buffer
3531 * @param[in] buf_size the output buffer size
3532 * @param[in] samples the input buffer containing the samples
3533 * The number of samples read from this buffer is frame_size*channels,
3534 * both of which are defined in avctx.
3535 * For PCM audio the number of samples read from samples is equal to
3536 * buf_size * input_sample_size / output_sample_size.
3537 * @return On error a negative value is returned, on success zero or the number
3538 * of bytes used to encode the data read from the input buffer.
3540 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3541 const short *samples);
3544 * Encodes a video frame from pict into buf.
3545 * The input picture should be
3546 * stored using a specific format, namely avctx.pix_fmt.
3548 * @param avctx the codec context
3549 * @param[out] buf the output buffer for the bitstream of encoded frame
3550 * @param[in] buf_size the size of the output buffer in bytes
3551 * @param[in] pict the input picture to encode
3552 * @return On error a negative value is returned, on success zero or the number
3553 * of bytes used from the output buffer.
3555 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3556 const AVFrame *pict);
3557 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3558 const AVSubtitle *sub);
3560 int avcodec_close(AVCodecContext *avctx);
3563 * Register all the codecs, parsers and bitstream filters which were enabled at
3564 * configuration time. If you do not call this function you can select exactly
3565 * which formats you want to support, by using the individual registration
3568 * @see avcodec_register
3569 * @see av_register_codec_parser
3570 * @see av_register_bitstream_filter
3572 void avcodec_register_all(void);
3575 * Flush buffers, should be called when seeking or when switching to a different stream.
3577 void avcodec_flush_buffers(AVCodecContext *avctx);
3579 void avcodec_default_free_buffers(AVCodecContext *s);
3581 /* misc useful functions */
3584 * Returns a single letter to describe the given picture type pict_type.
3586 * @param[in] pict_type the picture type
3587 * @return A single character representing the picture type.
3589 char av_get_pict_type_char(int pict_type);
3592 * Returns codec bits per sample.
3594 * @param[in] codec_id the codec
3595 * @return Number of bits per sample or zero if unknown for the given codec.
3597 int av_get_bits_per_sample(enum CodecID codec_id);
3600 * Returns sample format bits per sample.
3602 * @param[in] sample_fmt the sample format
3603 * @return Number of bits per sample or zero if unknown for the given sample format.
3605 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3608 typedef struct AVCodecParserContext {
3610 struct AVCodecParser *parser;
3611 int64_t frame_offset; /* offset of the current frame */
3612 int64_t cur_offset; /* current offset
3613 (incremented by each av_parser_parse()) */
3614 int64_t next_frame_offset; /* offset of the next frame */
3616 int pict_type; /* XXX: Put it back in AVCodecContext. */
3618 * This field is used for proper frame duration computation in lavf.
3619 * It signals, how much longer the frame duration of the current frame
3620 * is compared to normal frame duration.
3622 * frame_duration = (1 + repeat_pict) * time_base
3624 * It is used by codecs like H.264 to display telecined material.
3626 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3627 int64_t pts; /* pts of the current frame */
3628 int64_t dts; /* dts of the current frame */
3633 int fetch_timestamp;
3635 #define AV_PARSER_PTS_NB 4
3636 int cur_frame_start_index;
3637 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3638 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3639 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3642 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3644 int64_t offset; ///< byte offset from starting packet start
3645 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3648 * Set by parser to 1 for key frames and 0 for non-key frames.
3649 * It is initialized to -1, so if the parser doesn't set this flag,
3650 * old-style fallback using FF_I_TYPE picture type as key frames
3656 * Time difference in stream time base units from the pts of this
3657 * packet to the point at which the output from the decoder has converged
3658 * independent from the availability of previous frames. That is, the
3659 * frames are virtually identical no matter if decoding started from
3660 * the very first frame or from this keyframe.
3661 * Is AV_NOPTS_VALUE if unknown.
3662 * This field is not the display duration of the current frame.
3664 * The purpose of this field is to allow seeking in streams that have no
3665 * keyframes in the conventional sense. It corresponds to the
3666 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3667 * essential for some types of subtitle streams to ensure that all
3668 * subtitles are correctly displayed after seeking.
3670 int64_t convergence_duration;
3672 // Timestamp generation support:
3674 * Synchronization point for start of timestamp generation.
3676 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3679 * For example, this corresponds to presence of H.264 buffering period
3685 * Offset of the current timestamp against last timestamp sync point in
3686 * units of AVCodecContext.time_base.
3688 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3689 * contain a valid timestamp offset.
3691 * Note that the timestamp of sync point has usually a nonzero
3692 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3693 * the next frame after timestamp sync point will be usually 1.
3695 * For example, this corresponds to H.264 cpb_removal_delay.
3697 int dts_ref_dts_delta;
3700 * Presentation delay of current frame in units of AVCodecContext.time_base.
3702 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3703 * contain valid non-negative timestamp delta (presentation time of a frame
3704 * must not lie in the past).
3706 * This delay represents the difference between decoding and presentation
3707 * time of the frame.
3709 * For example, this corresponds to H.264 dpb_output_delay.
3714 * Position of the packet in file.
3716 * Analogous to cur_frame_pts/dts
3718 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3721 * Byte position of currently parsed frame in stream.
3726 * Previous frame byte position.
3729 } AVCodecParserContext;
3731 typedef struct AVCodecParser {
3732 int codec_ids[5]; /* several codec IDs are permitted */
3734 int (*parser_init)(AVCodecParserContext *s);
3735 int (*parser_parse)(AVCodecParserContext *s,
3736 AVCodecContext *avctx,
3737 const uint8_t **poutbuf, int *poutbuf_size,
3738 const uint8_t *buf, int buf_size);
3739 void (*parser_close)(AVCodecParserContext *s);
3740 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3741 struct AVCodecParser *next;
3744 AVCodecParser *av_parser_next(AVCodecParser *c);
3746 void av_register_codec_parser(AVCodecParser *parser);
3747 AVCodecParserContext *av_parser_init(int codec_id);
3749 #if LIBAVCODEC_VERSION_MAJOR < 53
3750 attribute_deprecated
3751 int av_parser_parse(AVCodecParserContext *s,
3752 AVCodecContext *avctx,
3753 uint8_t **poutbuf, int *poutbuf_size,
3754 const uint8_t *buf, int buf_size,
3755 int64_t pts, int64_t dts);
3761 * @param s parser context.
3762 * @param avctx codec context.
3763 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3764 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3765 * @param buf input buffer.
3766 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3767 * @param pts input presentation timestamp.
3768 * @param dts input decoding timestamp.
3769 * @param pos input byte position in stream.
3770 * @return the number of bytes of the input bitstream used.
3775 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3782 * decode_frame(data, size);
3786 int av_parser_parse2(AVCodecParserContext *s,
3787 AVCodecContext *avctx,
3788 uint8_t **poutbuf, int *poutbuf_size,
3789 const uint8_t *buf, int buf_size,
3790 int64_t pts, int64_t dts,
3793 int av_parser_change(AVCodecParserContext *s,
3794 AVCodecContext *avctx,
3795 uint8_t **poutbuf, int *poutbuf_size,
3796 const uint8_t *buf, int buf_size, int keyframe);
3797 void av_parser_close(AVCodecParserContext *s);
3800 typedef struct AVBitStreamFilterContext {
3802 struct AVBitStreamFilter *filter;
3803 AVCodecParserContext *parser;
3804 struct AVBitStreamFilterContext *next;
3805 } AVBitStreamFilterContext;
3808 typedef struct AVBitStreamFilter {
3811 int (*filter)(AVBitStreamFilterContext *bsfc,
3812 AVCodecContext *avctx, const char *args,
3813 uint8_t **poutbuf, int *poutbuf_size,
3814 const uint8_t *buf, int buf_size, int keyframe);
3815 void (*close)(AVBitStreamFilterContext *bsfc);
3816 struct AVBitStreamFilter *next;
3817 } AVBitStreamFilter;
3819 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3820 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3821 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3822 AVCodecContext *avctx, const char *args,
3823 uint8_t **poutbuf, int *poutbuf_size,
3824 const uint8_t *buf, int buf_size, int keyframe);
3825 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3827 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3832 * Reallocates the given block if it is not large enough, otherwise it
3837 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3840 * Allocates a buffer, reusing the given one if large enough.
3842 * Contrary to av_fast_realloc the current buffer contents might not be
3843 * preserved and on error the old buffer is freed, thus no special
3844 * handling to avoid memleaks is necessary.
3846 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3847 * @param size size of the buffer *ptr points to
3848 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3849 * *size 0 if an error occurred.
3851 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
3854 * Copy image 'src' to 'dst'.
3856 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3857 enum PixelFormat pix_fmt, int width, int height);
3860 * Crop image top and left side.
3862 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3863 enum PixelFormat pix_fmt, int top_band, int left_band);
3868 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
3869 int padtop, int padbottom, int padleft, int padright, int *color);
3872 * Encodes extradata length to a buffer. Used by xiph codecs.
3874 * @param s buffer to write to; must be at least (v/255+1) bytes long
3875 * @param v size of extradata in bytes
3876 * @return number of bytes written to the buffer.
3878 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
3881 * Parses str and put in width_ptr and height_ptr the detected values.
3883 * @return 0 in case of a successful parsing, a negative value otherwise
3884 * @param[in] str the string to parse: it has to be a string in the format
3885 * <width>x<height> or a valid video frame size abbreviation.
3886 * @param[in,out] width_ptr pointer to the variable which will contain the detected
3888 * @param[in,out] height_ptr pointer to the variable which will contain the detected
3889 * frame height value
3891 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
3894 * Parses str and put in frame_rate the detected values.
3896 * @return 0 in case of a successful parsing, a negative value otherwise
3897 * @param[in] str the string to parse: it has to be a string in the format
3898 * <frame_rate_num>/<frame_rate_den>, a float number or a valid video rate abbreviation
3899 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
3902 int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
3905 * Logs a generic warning message about a missing feature. This function is
3906 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
3907 * only, and would normally not be used by applications.
3908 * @param[in] avc a pointer to an arbitrary struct of which the first field is
3909 * a pointer to an AVClass struct
3910 * @param[in] feature string containing the name of the missing feature
3911 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
3912 * If want_sample is non-zero, additional verbage will be added to the log
3913 * message which tells the user how to report samples to the development
3916 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
3919 * Logs a generic warning message asking for a sample. This function is
3920 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
3921 * only, and would normally not be used by applications.
3922 * @param[in] avc a pointer to an arbitrary struct of which the first field is
3923 * a pointer to an AVClass struct
3924 * @param[in] msg string containing an optional message, or NULL if no message
3926 void av_log_ask_for_sample(void *avc, const char *msg);
3929 * Registers the hardware accelerator hwaccel.
3931 void av_register_hwaccel(AVHWAccel *hwaccel);
3934 * If hwaccel is NULL, returns the first registered hardware accelerator,
3935 * if hwaccel is non-NULL, returns the next registered hardware accelerator
3936 * after hwaccel, or NULL if hwaccel is the last one.
3938 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
3942 * Lock operation used by lockmgr
3945 AV_LOCK_CREATE, ///< Create a mutex
3946 AV_LOCK_OBTAIN, ///< Lock the mutex
3947 AV_LOCK_RELEASE, ///< Unlock the mutex
3948 AV_LOCK_DESTROY, ///< Free mutex resources
3952 * Register a user provided lock manager supporting the operations
3953 * specified by AVLockOp. mutex points to a (void *) where the
3954 * lockmgr should store/get a pointer to a user allocated mutex. It's
3955 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
3957 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
3958 * callback during the call to av_lockmgr_register().
3959 * Thus, the application must be prepared to handle that.
3960 * If cb is set to NULL the lockmgr will be unregistered.
3961 * Also note that during unregistration the previously registered
3962 * lockmgr callback may also be invoked.
3964 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
3966 #endif /* AVCODEC_AVCODEC_H */