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,
215 /* various PCM "codecs" */
216 CODEC_ID_PCM_S16LE= 0x10000,
232 CODEC_ID_PCM_S24DAUD,
234 CODEC_ID_PCM_S16LE_PLANAR,
242 /* various ADPCM codecs */
243 CODEC_ID_ADPCM_IMA_QT= 0x11000,
244 CODEC_ID_ADPCM_IMA_WAV,
245 CODEC_ID_ADPCM_IMA_DK3,
246 CODEC_ID_ADPCM_IMA_DK4,
247 CODEC_ID_ADPCM_IMA_WS,
248 CODEC_ID_ADPCM_IMA_SMJPEG,
257 CODEC_ID_ADPCM_YAMAHA,
258 CODEC_ID_ADPCM_SBPRO_4,
259 CODEC_ID_ADPCM_SBPRO_3,
260 CODEC_ID_ADPCM_SBPRO_2,
262 CODEC_ID_ADPCM_IMA_AMV,
263 CODEC_ID_ADPCM_EA_R1,
264 CODEC_ID_ADPCM_EA_R3,
265 CODEC_ID_ADPCM_EA_R2,
266 CODEC_ID_ADPCM_IMA_EA_SEAD,
267 CODEC_ID_ADPCM_IMA_EA_EACS,
268 CODEC_ID_ADPCM_EA_XAS,
269 CODEC_ID_ADPCM_EA_MAXIS_XA,
270 CODEC_ID_ADPCM_IMA_ISS,
273 CODEC_ID_AMR_NB= 0x12000,
276 /* RealAudio codecs*/
277 CODEC_ID_RA_144= 0x13000,
280 /* various DPCM codecs */
281 CODEC_ID_ROQ_DPCM= 0x14000,
282 CODEC_ID_INTERPLAY_DPCM,
287 CODEC_ID_MP2= 0x15000,
288 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
306 CODEC_ID_WESTWOOD_SND1,
307 CODEC_ID_GSM, ///< as in Berlin toast format
315 CODEC_ID_DSICINAUDIO,
319 CODEC_ID_GSM_MS, /* as found in WAV */
328 CODEC_ID_WMALOSSLESS,
337 CODEC_ID_BINKAUDIO_RDFT,
338 CODEC_ID_BINKAUDIO_DCT,
340 /* subtitle codecs */
341 CODEC_ID_DVD_SUBTITLE= 0x17000,
342 CODEC_ID_DVB_SUBTITLE,
343 CODEC_ID_TEXT, ///< raw UTF-8 text
347 CODEC_ID_HDMV_PGS_SUBTITLE,
348 CODEC_ID_DVB_TELETEXT,
350 /* other specific kind of codecs (generally used for attachments) */
351 CODEC_ID_TTF= 0x18000,
353 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
355 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
356 * stream (only used by libavformat) */
359 #if LIBAVCODEC_VERSION_MAJOR < 53
360 #define CodecType AVMediaType
362 #define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
363 #define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
364 #define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
365 #define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
366 #define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
367 #define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
368 #define CODEC_TYPE_NB AVMEDIA_TYPE_NB
372 * all in native-endian format
375 SAMPLE_FMT_NONE = -1,
376 SAMPLE_FMT_U8, ///< unsigned 8 bits
377 SAMPLE_FMT_S16, ///< signed 16 bits
378 SAMPLE_FMT_S32, ///< signed 32 bits
379 SAMPLE_FMT_FLT, ///< float
380 SAMPLE_FMT_DBL, ///< double
381 SAMPLE_FMT_NB ///< Number of sample formats. DO NOT USE if dynamically linking to libavcodec
384 /* Audio channel masks */
385 #define CH_FRONT_LEFT 0x00000001
386 #define CH_FRONT_RIGHT 0x00000002
387 #define CH_FRONT_CENTER 0x00000004
388 #define CH_LOW_FREQUENCY 0x00000008
389 #define CH_BACK_LEFT 0x00000010
390 #define CH_BACK_RIGHT 0x00000020
391 #define CH_FRONT_LEFT_OF_CENTER 0x00000040
392 #define CH_FRONT_RIGHT_OF_CENTER 0x00000080
393 #define CH_BACK_CENTER 0x00000100
394 #define CH_SIDE_LEFT 0x00000200
395 #define CH_SIDE_RIGHT 0x00000400
396 #define CH_TOP_CENTER 0x00000800
397 #define CH_TOP_FRONT_LEFT 0x00001000
398 #define CH_TOP_FRONT_CENTER 0x00002000
399 #define CH_TOP_FRONT_RIGHT 0x00004000
400 #define CH_TOP_BACK_LEFT 0x00008000
401 #define CH_TOP_BACK_CENTER 0x00010000
402 #define CH_TOP_BACK_RIGHT 0x00020000
403 #define CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
404 #define CH_STEREO_RIGHT 0x40000000 ///< See CH_STEREO_LEFT.
406 /** Channel mask value used for AVCodecContext.request_channel_layout
407 to indicate that the user requests the channel order of the decoder output
408 to be the native codec channel order. */
409 #define CH_LAYOUT_NATIVE 0x8000000000000000LL
411 /* Audio channel convenience macros */
412 #define CH_LAYOUT_MONO (CH_FRONT_CENTER)
413 #define CH_LAYOUT_STEREO (CH_FRONT_LEFT|CH_FRONT_RIGHT)
414 #define CH_LAYOUT_2_1 (CH_LAYOUT_STEREO|CH_BACK_CENTER)
415 #define CH_LAYOUT_SURROUND (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
416 #define CH_LAYOUT_4POINT0 (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
417 #define CH_LAYOUT_2_2 (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
418 #define CH_LAYOUT_QUAD (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
419 #define CH_LAYOUT_5POINT0 (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
420 #define CH_LAYOUT_5POINT1 (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)
421 #define CH_LAYOUT_5POINT0_BACK (CH_LAYOUT_SURROUND|CH_BACK_LEFT|CH_BACK_RIGHT)
422 #define CH_LAYOUT_5POINT1_BACK (CH_LAYOUT_5POINT0_BACK|CH_LOW_FREQUENCY)
423 #define CH_LAYOUT_7POINT0 (CH_LAYOUT_5POINT0|CH_BACK_LEFT|CH_BACK_RIGHT)
424 #define CH_LAYOUT_7POINT1 (CH_LAYOUT_5POINT1|CH_BACK_LEFT|CH_BACK_RIGHT)
425 #define CH_LAYOUT_7POINT1_WIDE (CH_LAYOUT_5POINT1_BACK|\
426 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER)
427 #define CH_LAYOUT_STEREO_DOWNMIX (CH_STEREO_LEFT|CH_STEREO_RIGHT)
430 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
433 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
434 * This is mainly needed because some optimized bitstream readers read
435 * 32 or 64 bit at once and could read over the end.<br>
436 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
437 * MPEG bitstreams could cause overread and segfault.
439 #define FF_INPUT_BUFFER_PADDING_SIZE 8
442 * minimum encoding buffer size
443 * Used to avoid some checks during header writing.
445 #define FF_MIN_BUFFER_SIZE 16384
449 * motion estimation type.
452 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
456 ME_EPZS, ///< enhanced predictive zonal search
457 ME_X1, ///< reserved for experiments
458 ME_HEX, ///< hexagon based search
459 ME_UMH, ///< uneven multi-hexagon search
460 ME_ITER, ///< iterative search
461 ME_TESA, ///< transformed exhaustive search algorithm
465 /* We leave some space between them for extensions (drop some
466 * keyframes for intra-only or drop just some bidir frames). */
467 AVDISCARD_NONE =-16, ///< discard nothing
468 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
469 AVDISCARD_NONREF = 8, ///< discard all non reference
470 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
471 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
472 AVDISCARD_ALL = 48, ///< discard all
475 enum AVColorPrimaries{
476 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
477 AVCOL_PRI_UNSPECIFIED=2,
479 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
480 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
481 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
483 AVCOL_PRI_NB , ///< Not part of ABI
486 enum AVColorTransferCharacteristic{
487 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
488 AVCOL_TRC_UNSPECIFIED=2,
489 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
490 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
491 AVCOL_TRC_NB , ///< Not part of ABI
496 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
497 AVCOL_SPC_UNSPECIFIED=2,
499 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
500 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
501 AVCOL_SPC_SMPTE240M =7,
502 AVCOL_SPC_NB , ///< Not part of ABI
506 AVCOL_RANGE_UNSPECIFIED=0,
507 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
508 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
509 AVCOL_RANGE_NB , ///< Not part of ABI
513 * X X 3 4 X X are luma samples,
514 * 1 2 1-6 are possible chroma positions
515 * X X 5 6 X 0 is undefined/unknown position
517 enum AVChromaLocation{
518 AVCHROMA_LOC_UNSPECIFIED=0,
519 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
520 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
521 AVCHROMA_LOC_TOPLEFT =3, ///< DV
523 AVCHROMA_LOC_BOTTOMLEFT =5,
524 AVCHROMA_LOC_BOTTOM =6,
525 AVCHROMA_LOC_NB , ///< Not part of ABI
528 typedef struct RcOverride{
531 int qscale; // If this is 0 then quality_factor will be used instead.
532 float quality_factor;
535 #define FF_MAX_B_FRAMES 16
538 These flags can be passed in AVCodecContext.flags before initialization.
539 Note: Not everything is supported yet.
542 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
543 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
544 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
545 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
546 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
547 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
549 * The parent program guarantees that the input for B-frames containing
550 * streams is not written to for at least s->max_b_frames+1 frames, if
551 * this is not set the input will be copied.
553 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
554 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
555 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
556 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
557 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
558 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
559 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
560 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
561 location instead of only at frame boundaries. */
562 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
563 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
564 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
565 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
566 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
567 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
568 /* Fx : Flag for h263+ extra options */
569 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
570 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
571 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
572 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
573 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
574 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
575 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
576 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
577 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
578 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
579 #define CODEC_FLAG_CLOSED_GOP 0x80000000
580 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
581 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
582 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
583 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
584 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
585 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
586 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
587 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
588 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
589 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
590 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
591 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
592 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
593 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
594 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
595 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
596 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
597 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
598 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
599 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
600 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
601 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
603 /* Unsupported options :
604 * Syntax Arithmetic coding (SAC)
605 * Reference Picture Selection
606 * Independent Segment Decoding */
608 /* codec capabilities */
610 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
612 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
613 * If not set, it might not use get_buffer() at all or use operations that
614 * assume the buffer was allocated by avcodec_default_get_buffer.
616 #define CODEC_CAP_DR1 0x0002
617 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
618 #define CODEC_CAP_PARSE_ONLY 0x0004
619 #define CODEC_CAP_TRUNCATED 0x0008
620 /* Codec can export data for HW decoding (XvMC). */
621 #define CODEC_CAP_HWACCEL 0x0010
623 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
624 * If this is not set, the codec is guaranteed to never be fed with NULL data.
626 #define CODEC_CAP_DELAY 0x0020
628 * Codec can be fed a final frame with a smaller size.
629 * This can be used to prevent truncation of the last audio samples.
631 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
633 * Codec can export data for HW decoding (VDPAU).
635 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
637 * Codec can output multiple frames per AVPacket
638 * Normally demuxers return one frame at a time, demuxers which do not do
639 * are connected to a parser to split what they return into proper frames.
640 * This flag is reserved to the very rare category of codecs which have a
641 * bitstream that cannot be split into frames without timeconsuming
642 * operations like full decoding. Demuxers carring such bitstreams thus
643 * may return multiple frames in a packet. This has many disadvantages like
644 * prohibiting stream copy in many cases thus it should only be considered
647 #define CODEC_CAP_SUBFRAMES 0x0100
649 //The following defines may change, don't expect compatibility if you use them.
650 #define MB_TYPE_INTRA4x4 0x0001
651 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
652 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
653 #define MB_TYPE_16x16 0x0008
654 #define MB_TYPE_16x8 0x0010
655 #define MB_TYPE_8x16 0x0020
656 #define MB_TYPE_8x8 0x0040
657 #define MB_TYPE_INTERLACED 0x0080
658 #define MB_TYPE_DIRECT2 0x0100 //FIXME
659 #define MB_TYPE_ACPRED 0x0200
660 #define MB_TYPE_GMC 0x0400
661 #define MB_TYPE_SKIP 0x0800
662 #define MB_TYPE_P0L0 0x1000
663 #define MB_TYPE_P1L0 0x2000
664 #define MB_TYPE_P0L1 0x4000
665 #define MB_TYPE_P1L1 0x8000
666 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
667 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
668 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
669 #define MB_TYPE_QUANT 0x00010000
670 #define MB_TYPE_CBP 0x00020000
671 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
675 * This specifies the area which should be displayed.
676 * Note there may be multiple such areas for one frame.
678 typedef struct AVPanScan{
681 * - encoding: Set by user.
682 * - decoding: Set by libavcodec.
687 * width and height in 1/16 pel
688 * - encoding: Set by user.
689 * - decoding: Set by libavcodec.
695 * position of the top left corner in 1/16 pel for up to 3 fields/frames
696 * - encoding: Set by user.
697 * - decoding: Set by libavcodec.
699 int16_t position[3][2];
702 #define FF_COMMON_FRAME \
704 * pointer to the picture planes.\
705 * This might be different from the first allocated byte\
712 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
713 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
719 * 1 -> keyframe, 0-> not\
720 * - encoding: Set by libavcodec.\
721 * - decoding: Set by libavcodec.\
726 * Picture type of the frame, see ?_TYPE below.\
727 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
728 * - decoding: Set by libavcodec.\
733 * presentation timestamp in time_base units (time when frame should be shown to user)\
734 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
735 * - encoding: MUST be set by user.\
736 * - decoding: Set by libavcodec.\
741 * picture number in bitstream order\
742 * - encoding: set by\
743 * - decoding: Set by libavcodec.\
745 int coded_picture_number;\
747 * picture number in display order\
748 * - encoding: set by\
749 * - decoding: Set by libavcodec.\
751 int display_picture_number;\
754 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
755 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
756 * - decoding: Set by libavcodec.\
761 * buffer age (1->was last buffer and dint change, 2->..., ...).\
762 * Set to INT_MAX if the buffer has not been used yet.\
763 * - encoding: unused\
764 * - decoding: MUST be set by get_buffer().\
769 * is this picture used as reference\
770 * The values for this are the same as the MpegEncContext.picture_structure\
771 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
772 * Set to 4 for delayed, non-reference frames.\
773 * - encoding: unused\
774 * - decoding: Set by libavcodec. (before get_buffer() call)).\
780 * - encoding: unused\
781 * - decoding: Set by libavcodec.\
783 int8_t *qscale_table;\
786 * - encoding: unused\
787 * - decoding: Set by libavcodec.\
792 * mbskip_table[mb]>=1 if MB didn't change\
793 * stride= mb_width = (width+15)>>4\
794 * - encoding: unused\
795 * - decoding: Set by libavcodec.\
797 uint8_t *mbskip_table;\
800 * motion vector table\
803 * int mv_sample_log2= 4 - motion_subsample_log2;\
804 * int mb_width= (width+15)>>4;\
805 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
806 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
808 * - encoding: Set by user.\
809 * - decoding: Set by libavcodec.\
811 int16_t (*motion_val[2])[2];\
814 * macroblock type table\
815 * mb_type_base + mb_width + 2\
816 * - encoding: Set by user.\
817 * - decoding: Set by libavcodec.\
822 * log2 of the size of the block which a single vector in motion_val represents: \
823 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
824 * - encoding: unused\
825 * - decoding: Set by libavcodec.\
827 uint8_t motion_subsample_log2;\
830 * for some private data of the user\
831 * - encoding: unused\
832 * - decoding: Set by user.\
838 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
839 * - decoding: unused\
844 * type of the buffer (to keep track of who has to deallocate data[*])\
845 * - encoding: Set by the one who allocates it.\
846 * - decoding: Set by the one who allocates it.\
847 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
852 * When decoding, this signals how much the picture must be delayed.\
853 * extra_delay = repeat_pict / (2*fps)\
854 * - encoding: unused\
855 * - decoding: Set by libavcodec.\
865 * The content of the picture is interlaced.\
866 * - encoding: Set by user.\
867 * - decoding: Set by libavcodec. (default 0)\
869 int interlaced_frame;\
872 * If the content is interlaced, is top field displayed first.\
873 * - encoding: Set by user.\
874 * - decoding: Set by libavcodec.\
876 int top_field_first;\
880 * - encoding: Set by user.\
881 * - decoding: Set by libavcodec.\
883 AVPanScan *pan_scan;\
886 * Tell user application that palette has changed from previous frame.\
887 * - encoding: ??? (no palette-enabled encoder yet)\
888 * - decoding: Set by libavcodec. (default 0).\
890 int palette_has_changed;\
893 * codec suggestion on buffer type if != 0\
894 * - encoding: unused\
895 * - decoding: Set by libavcodec. (before get_buffer() call)).\
901 * - encoding: unused\
902 * - decoding: Set by libavcodec.\
907 * motion reference frame index\
908 * the order in which these are stored can depend on the codec.\
909 * - encoding: Set by user.\
910 * - decoding: Set by libavcodec.\
912 int8_t *ref_index[2];\
915 * reordered opaque 64bit number (generally a PTS) from AVCodecContext.reordered_opaque\
916 * output in AVFrame.reordered_opaque\
917 * - encoding: unused\
918 * - decoding: Read by user.\
920 int64_t reordered_opaque;\
923 * hardware accelerator private data (FFmpeg allocated)\
924 * - encoding: unused\
925 * - decoding: Set by libavcodec\
927 void *hwaccel_picture_private;\
930 #define FF_QSCALE_TYPE_MPEG1 0
931 #define FF_QSCALE_TYPE_MPEG2 1
932 #define FF_QSCALE_TYPE_H264 2
933 #define FF_QSCALE_TYPE_VP56 3
935 #define FF_BUFFER_TYPE_INTERNAL 1
936 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
937 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
938 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
941 #define FF_I_TYPE 1 ///< Intra
942 #define FF_P_TYPE 2 ///< Predicted
943 #define FF_B_TYPE 3 ///< Bi-dir predicted
944 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
945 #define FF_SI_TYPE 5 ///< Switching Intra
946 #define FF_SP_TYPE 6 ///< Switching Predicted
949 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
950 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
951 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
952 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
954 typedef struct AVPacket {
956 * Presentation timestamp in AVStream->time_base units; the time at which
957 * the decompressed packet will be presented to the user.
958 * Can be AV_NOPTS_VALUE if it is not stored in the file.
959 * pts MUST be larger or equal to dts as presentation cannot happen before
960 * decompression, unless one wants to view hex dumps. Some formats misuse
961 * the terms dts and pts/cts to mean something different. Such timestamps
962 * must be converted to true pts/dts before they are stored in AVPacket.
966 * Decompression timestamp in AVStream->time_base units; the time at which
967 * the packet is decompressed.
968 * Can be AV_NOPTS_VALUE if it is not stored in the file.
976 * Duration of this packet in AVStream->time_base units, 0 if unknown.
977 * Equals next_pts - this_pts in presentation order.
980 void (*destruct)(struct AVPacket *);
982 int64_t pos; ///< byte position in stream, -1 if unknown
985 * Time difference in AVStream->time_base units from the pts of this
986 * packet to the point at which the output from the decoder has converged
987 * independent from the availability of previous frames. That is, the
988 * frames are virtually identical no matter if decoding started from
989 * the very first frame or from this keyframe.
990 * Is AV_NOPTS_VALUE if unknown.
991 * This field is not the display duration of the current packet.
993 * The purpose of this field is to allow seeking in streams that have no
994 * keyframes in the conventional sense. It corresponds to the
995 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
996 * essential for some types of subtitle streams to ensure that all
997 * subtitles are correctly displayed after seeking.
999 int64_t convergence_duration;
1001 #define AV_PKT_FLAG_KEY 0x0001
1002 #if LIBAVCODEC_VERSION_MAJOR < 53
1003 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1007 * Audio Video Frame.
1008 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1010 * Removal, reordering and changes to existing fields require a major
1011 * version bump. No fields should be added into AVFrame before or after
1013 * sizeof(AVFrame) must not be used outside libav*.
1015 typedef struct AVFrame {
1020 * main external API structure.
1021 * New fields can be added to the end with minor version bumps.
1022 * Removal, reordering and changes to existing fields require a major
1024 * sizeof(AVCodecContext) must not be used outside libav*.
1026 typedef struct AVCodecContext {
1028 * information on struct for av_log
1029 * - set by avcodec_alloc_context
1031 const AVClass *av_class;
1033 * the average bitrate
1034 * - encoding: Set by user; unused for constant quantizer encoding.
1035 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1040 * number of bits the bitstream is allowed to diverge from the reference.
1041 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1042 * - encoding: Set by user; unused for constant quantizer encoding.
1043 * - decoding: unused
1045 int bit_rate_tolerance;
1049 * - encoding: Set by user.
1050 * - decoding: Set by user.
1055 * Some codecs need additional format info. It is stored here.
1056 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1057 * specific codec MUST set it correctly otherwise stream copy breaks.
1058 * In general use of this field by muxers is not recommanded.
1059 * - encoding: Set by libavcodec.
1060 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1065 * Motion estimation algorithm used for video coding.
1066 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1067 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1068 * - encoding: MUST be set by user.
1069 * - decoding: unused
1074 * some codecs need / can use extradata like Huffman tables.
1075 * mjpeg: Huffman tables
1076 * rv10: additional flags
1077 * mpeg4: global headers (they can be in the bitstream or here)
1078 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1079 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1080 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1081 * - encoding: Set/allocated/freed by libavcodec.
1082 * - decoding: Set/allocated/freed by user.
1088 * This is the fundamental unit of time (in seconds) in terms
1089 * of which frame timestamps are represented. For fixed-fps content,
1090 * timebase should be 1/framerate and timestamp increments should be
1092 * - encoding: MUST be set by user.
1093 * - decoding: Set by libavcodec.
1095 AVRational time_base;
1099 * picture width / height.
1100 * - encoding: MUST be set by user.
1101 * - decoding: Set by libavcodec.
1102 * Note: For compatibility it is possible to set this instead of
1103 * coded_width/height before decoding.
1107 #define FF_ASPECT_EXTENDED 15
1110 * the number of pictures in a group of pictures, or 0 for intra_only
1111 * - encoding: Set by user.
1112 * - decoding: unused
1117 * Pixel format, see PIX_FMT_xxx.
1118 * - encoding: Set by user.
1119 * - decoding: Set by libavcodec.
1121 enum PixelFormat pix_fmt;
1124 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1125 * has to read frames at native frame rate.
1126 * - encoding: Set by user.
1127 * - decoding: unused
1132 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1133 * decoder to draw a horizontal band. It improves cache usage. Not
1134 * all codecs can do that. You must check the codec capabilities
1136 * The function is also used by hardware acceleration APIs.
1137 * It is called at least once during frame decoding to pass
1138 * the data needed for hardware render.
1139 * In that mode instead of pixel data, AVFrame points to
1140 * a structure specific to the acceleration API. The application
1141 * reads the structure and can change some fields to indicate progress
1143 * - encoding: unused
1144 * - decoding: Set by user.
1145 * @param height the height of the slice
1146 * @param y the y position of the slice
1147 * @param type 1->top field, 2->bottom field, 3->frame
1148 * @param offset offset into the AVFrame.data from which the slice should be read
1150 void (*draw_horiz_band)(struct AVCodecContext *s,
1151 const AVFrame *src, int offset[4],
1152 int y, int type, int height);
1155 int sample_rate; ///< samples per second
1156 int channels; ///< number of audio channels
1159 * audio sample format
1160 * - encoding: Set by user.
1161 * - decoding: Set by libavcodec.
1163 enum SampleFormat sample_fmt; ///< sample format
1165 /* The following data should not be initialized. */
1167 * Samples per packet, initialized when calling 'init'.
1170 int frame_number; ///< audio or video frame number
1171 #if LIBAVCODEC_VERSION_MAJOR < 53
1172 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1176 * Number of frames the decoded output will be delayed relative to
1177 * the encoded input.
1178 * - encoding: Set by libavcodec.
1179 * - decoding: unused
1183 /* - encoding parameters */
1184 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1185 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1189 * - encoding: Set by user.
1190 * - decoding: unused
1196 * - encoding: Set by user.
1197 * - decoding: unused
1202 * maximum quantizer difference between frames
1203 * - encoding: Set by user.
1204 * - decoding: unused
1209 * maximum number of B-frames between non-B-frames
1210 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1211 * - encoding: Set by user.
1212 * - decoding: unused
1217 * qscale factor between IP and B-frames
1218 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1219 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1220 * - encoding: Set by user.
1221 * - decoding: unused
1223 float b_quant_factor;
1225 /** obsolete FIXME remove */
1227 #define FF_RC_STRATEGY_XVID 1
1229 int b_frame_strategy;
1233 * - encoding: unused
1234 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1235 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1239 struct AVCodec *codec;
1243 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1244 /* do its best to deliver a chunk with size */
1245 /* below rtp_payload_size, the chunk will start */
1246 /* with a start code on some codecs like H.263. */
1247 /* This doesn't take account of any particular */
1248 /* headers inside the transmitted RTP payload. */
1251 /* The RTP callback: This function is called */
1252 /* every time the encoder has a packet to send. */
1253 /* It depends on the encoder if the data starts */
1254 /* with a Start Code (it should). H.263 does. */
1255 /* mb_nb contains the number of macroblocks */
1256 /* encoded in the RTP payload. */
1257 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1259 /* statistics, used for 2-pass encoding */
1270 * number of bits used for the previously encoded frame
1271 * - encoding: Set by libavcodec.
1272 * - decoding: unused
1277 * Private data of the user, can be used to carry app specific stuff.
1278 * - encoding: Set by user.
1279 * - decoding: Set by user.
1283 char codec_name[32];
1284 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1285 enum CodecID codec_id; /* see CODEC_ID_xxx */
1288 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1289 * This is used to work around some encoder bugs.
1290 * A demuxer should set this to what is stored in the field used to identify the codec.
1291 * If there are multiple such fields in a container then the demuxer should choose the one
1292 * which maximizes the information about the used codec.
1293 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1294 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1295 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1297 * - encoding: Set by user, if not then the default based on codec_id will be used.
1298 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1300 unsigned int codec_tag;
1303 * Work around bugs in encoders which sometimes cannot be detected automatically.
1304 * - encoding: Set by user
1305 * - decoding: Set by user
1307 int workaround_bugs;
1308 #define FF_BUG_AUTODETECT 1 ///< autodetection
1309 #define FF_BUG_OLD_MSMPEG4 2
1310 #define FF_BUG_XVID_ILACE 4
1311 #define FF_BUG_UMP4 8
1312 #define FF_BUG_NO_PADDING 16
1313 #define FF_BUG_AMV 32
1314 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1315 #define FF_BUG_QPEL_CHROMA 64
1316 #define FF_BUG_STD_QPEL 128
1317 #define FF_BUG_QPEL_CHROMA2 256
1318 #define FF_BUG_DIRECT_BLOCKSIZE 512
1319 #define FF_BUG_EDGE 1024
1320 #define FF_BUG_HPEL_CHROMA 2048
1321 #define FF_BUG_DC_CLIP 4096
1322 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1323 #define FF_BUG_TRUNCATED 16384
1324 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1327 * luma single coefficient elimination threshold
1328 * - encoding: Set by user.
1329 * - decoding: unused
1331 int luma_elim_threshold;
1334 * chroma single coeff elimination threshold
1335 * - encoding: Set by user.
1336 * - decoding: unused
1338 int chroma_elim_threshold;
1341 * strictly follow the standard (MPEG4, ...).
1342 * - encoding: Set by user.
1343 * - decoding: Set by user.
1344 * Setting this to STRICT or higher means the encoder and decoder will
1345 * generally do stupid things. While setting it to inofficial or lower
1346 * will mean the encoder might use things that are not supported by all
1347 * spec compliant decoders. Decoders make no difference between normal,
1348 * inofficial and experimental, that is they always try to decode things
1349 * when they can unless they are explicitly asked to behave stupid
1350 * (=strictly conform to the specs)
1352 int strict_std_compliance;
1353 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1354 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1355 #define FF_COMPLIANCE_NORMAL 0
1356 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1357 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1360 * qscale offset between IP and B-frames
1361 * - encoding: Set by user.
1362 * - decoding: unused
1364 float b_quant_offset;
1367 * Error recognization; higher values will detect more errors but may
1368 * misdetect some more or less valid parts as errors.
1369 * - encoding: unused
1370 * - decoding: Set by user.
1372 int error_recognition;
1373 #define FF_ER_CAREFUL 1
1374 #define FF_ER_COMPLIANT 2
1375 #define FF_ER_AGGRESSIVE 3
1376 #define FF_ER_VERY_AGGRESSIVE 4
1379 * Called at the beginning of each frame to get a buffer for it.
1380 * If pic.reference is set then the frame will be read later by libavcodec.
1381 * avcodec_align_dimensions2() should be used to find the required width and
1382 * height, as they normally need to be rounded up to the next multiple of 16.
1383 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1384 * avcodec_default_get_buffer() instead of providing buffers allocated by
1386 * - encoding: unused
1387 * - decoding: Set by libavcodec., user can override.
1389 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1392 * Called to release buffers which were allocated with get_buffer.
1393 * A released buffer can be reused in get_buffer().
1394 * pic.data[*] must be set to NULL.
1395 * - encoding: unused
1396 * - decoding: Set by libavcodec., user can override.
1398 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1401 * Size of the frame reordering buffer in the decoder.
1402 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1403 * - encoding: Set by libavcodec.
1404 * - decoding: Set by libavcodec.
1409 * number of bytes per packet if constant and known or 0
1410 * Used by some WAV based audio codecs.
1414 int parse_only; /* - decoding only: If true, only parsing is done
1415 (function avcodec_parse_frame()). The frame
1416 data is returned. Only MPEG codecs support this now. */
1419 * 0-> h263 quant 1-> mpeg quant
1420 * - encoding: Set by user.
1421 * - decoding: unused
1426 * pass1 encoding statistics output buffer
1427 * - encoding: Set by libavcodec.
1428 * - decoding: unused
1433 * pass2 encoding statistics input buffer
1434 * Concatenated stuff from stats_out of pass1 should be placed here.
1435 * - encoding: Allocated/set/freed by user.
1436 * - decoding: unused
1441 * ratecontrol qmin qmax limiting method
1442 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1443 * - encoding: Set by user.
1444 * - decoding: unused
1452 * ratecontrol override, see RcOverride
1453 * - encoding: Allocated/set/freed by user.
1454 * - decoding: unused
1456 RcOverride *rc_override;
1457 int rc_override_count;
1460 * rate control equation
1461 * - encoding: Set by user
1462 * - decoding: unused
1468 * - encoding: Set by user.
1469 * - decoding: unused
1475 * - encoding: Set by user.
1476 * - decoding: unused
1481 * decoder bitstream buffer size
1482 * - encoding: Set by user.
1483 * - decoding: unused
1486 float rc_buffer_aggressivity;
1489 * qscale factor between P and I-frames
1490 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1491 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1492 * - encoding: Set by user.
1493 * - decoding: unused
1495 float i_quant_factor;
1498 * qscale offset between P and I-frames
1499 * - encoding: Set by user.
1500 * - decoding: unused
1502 float i_quant_offset;
1505 * initial complexity for pass1 ratecontrol
1506 * - encoding: Set by user.
1507 * - decoding: unused
1509 float rc_initial_cplx;
1512 * DCT algorithm, see FF_DCT_* below
1513 * - encoding: Set by user.
1514 * - decoding: unused
1517 #define FF_DCT_AUTO 0
1518 #define FF_DCT_FASTINT 1
1519 #define FF_DCT_INT 2
1520 #define FF_DCT_MMX 3
1521 #define FF_DCT_MLIB 4
1522 #define FF_DCT_ALTIVEC 5
1523 #define FF_DCT_FAAN 6
1526 * luminance masking (0-> disabled)
1527 * - encoding: Set by user.
1528 * - decoding: unused
1533 * temporary complexity masking (0-> disabled)
1534 * - encoding: Set by user.
1535 * - decoding: unused
1537 float temporal_cplx_masking;
1540 * spatial complexity masking (0-> disabled)
1541 * - encoding: Set by user.
1542 * - decoding: unused
1544 float spatial_cplx_masking;
1547 * p block masking (0-> disabled)
1548 * - encoding: Set by user.
1549 * - decoding: unused
1554 * darkness masking (0-> disabled)
1555 * - encoding: Set by user.
1556 * - decoding: unused
1561 * IDCT algorithm, see FF_IDCT_* below.
1562 * - encoding: Set by user.
1563 * - decoding: Set by user.
1566 #define FF_IDCT_AUTO 0
1567 #define FF_IDCT_INT 1
1568 #define FF_IDCT_SIMPLE 2
1569 #define FF_IDCT_SIMPLEMMX 3
1570 #define FF_IDCT_LIBMPEG2MMX 4
1571 #define FF_IDCT_PS2 5
1572 #define FF_IDCT_MLIB 6
1573 #define FF_IDCT_ARM 7
1574 #define FF_IDCT_ALTIVEC 8
1575 #define FF_IDCT_SH4 9
1576 #define FF_IDCT_SIMPLEARM 10
1577 #define FF_IDCT_H264 11
1578 #define FF_IDCT_VP3 12
1579 #define FF_IDCT_IPP 13
1580 #define FF_IDCT_XVIDMMX 14
1581 #define FF_IDCT_CAVS 15
1582 #define FF_IDCT_SIMPLEARMV5TE 16
1583 #define FF_IDCT_SIMPLEARMV6 17
1584 #define FF_IDCT_SIMPLEVIS 18
1585 #define FF_IDCT_WMV2 19
1586 #define FF_IDCT_FAAN 20
1587 #define FF_IDCT_EA 21
1588 #define FF_IDCT_SIMPLENEON 22
1589 #define FF_IDCT_SIMPLEALPHA 23
1590 #define FF_IDCT_BINK 24
1594 * - encoding: Set by libavcodec.
1595 * - decoding: Set by user (or 0).
1599 * slice offsets in the frame in bytes
1600 * - encoding: Set/allocated by libavcodec.
1601 * - decoding: Set/allocated by user (or NULL).
1606 * error concealment flags
1607 * - encoding: unused
1608 * - decoding: Set by user.
1610 int error_concealment;
1611 #define FF_EC_GUESS_MVS 1
1612 #define FF_EC_DEBLOCK 2
1615 * dsp_mask could be add used to disable unwanted CPU features
1616 * CPU features (i.e. MMX, SSE. ...)
1618 * With the FORCE flag you may instead enable given CPU features.
1619 * (Dangerous: Usable in case of misdetection, improper usage however will
1620 * result into program crash.)
1623 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1624 /* lower 16 bits - CPU features */
1625 #define FF_MM_MMX 0x0001 ///< standard MMX
1626 #define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
1627 #if LIBAVCODEC_VERSION_MAJOR < 53
1628 #define FF_MM_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
1630 #define FF_MM_MMX2 0x0002 ///< SSE integer functions or AMD MMX ext
1631 #define FF_MM_SSE 0x0008 ///< SSE functions
1632 #define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
1633 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1634 #define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
1635 #define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
1636 #define FF_MM_SSE4 0x0100 ///< Penryn SSE4.1 functions
1637 #define FF_MM_SSE42 0x0200 ///< Nehalem SSE4.2 functions
1638 #define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
1639 #define FF_MM_ALTIVEC 0x0001 ///< standard AltiVec
1642 * bits per sample/pixel from the demuxer (needed for huffyuv).
1643 * - encoding: Set by libavcodec.
1644 * - decoding: Set by user.
1646 int bits_per_coded_sample;
1649 * prediction method (needed for huffyuv)
1650 * - encoding: Set by user.
1651 * - decoding: unused
1653 int prediction_method;
1654 #define FF_PRED_LEFT 0
1655 #define FF_PRED_PLANE 1
1656 #define FF_PRED_MEDIAN 2
1659 * sample aspect ratio (0 if unknown)
1660 * That is the width of a pixel divided by the height of the pixel.
1661 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1662 * - encoding: Set by user.
1663 * - decoding: Set by libavcodec.
1665 AVRational sample_aspect_ratio;
1668 * the picture in the bitstream
1669 * - encoding: Set by libavcodec.
1670 * - decoding: Set by libavcodec.
1672 AVFrame *coded_frame;
1676 * - encoding: Set by user.
1677 * - decoding: Set by user.
1680 #define FF_DEBUG_PICT_INFO 1
1681 #define FF_DEBUG_RC 2
1682 #define FF_DEBUG_BITSTREAM 4
1683 #define FF_DEBUG_MB_TYPE 8
1684 #define FF_DEBUG_QP 16
1685 #define FF_DEBUG_MV 32
1686 #define FF_DEBUG_DCT_COEFF 0x00000040
1687 #define FF_DEBUG_SKIP 0x00000080
1688 #define FF_DEBUG_STARTCODE 0x00000100
1689 #define FF_DEBUG_PTS 0x00000200
1690 #define FF_DEBUG_ER 0x00000400
1691 #define FF_DEBUG_MMCO 0x00000800
1692 #define FF_DEBUG_BUGS 0x00001000
1693 #define FF_DEBUG_VIS_QP 0x00002000
1694 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1695 #define FF_DEBUG_BUFFERS 0x00008000
1699 * - encoding: Set by user.
1700 * - decoding: Set by user.
1703 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1704 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1705 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1709 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1710 * - decoding: unused
1715 * minimum MB quantizer
1716 * - encoding: unused
1717 * - decoding: unused
1722 * maximum MB quantizer
1723 * - encoding: unused
1724 * - decoding: unused
1729 * motion estimation comparison function
1730 * - encoding: Set by user.
1731 * - decoding: unused
1735 * subpixel motion estimation comparison function
1736 * - encoding: Set by user.
1737 * - decoding: unused
1741 * macroblock comparison function (not supported yet)
1742 * - encoding: Set by user.
1743 * - decoding: unused
1747 * interlaced DCT comparison function
1748 * - encoding: Set by user.
1749 * - decoding: unused
1752 #define FF_CMP_SAD 0
1753 #define FF_CMP_SSE 1
1754 #define FF_CMP_SATD 2
1755 #define FF_CMP_DCT 3
1756 #define FF_CMP_PSNR 4
1757 #define FF_CMP_BIT 5
1759 #define FF_CMP_ZERO 7
1760 #define FF_CMP_VSAD 8
1761 #define FF_CMP_VSSE 9
1762 #define FF_CMP_NSSE 10
1763 #define FF_CMP_W53 11
1764 #define FF_CMP_W97 12
1765 #define FF_CMP_DCTMAX 13
1766 #define FF_CMP_DCT264 14
1767 #define FF_CMP_CHROMA 256
1770 * ME diamond size & shape
1771 * - encoding: Set by user.
1772 * - decoding: unused
1777 * amount of previous MV predictors (2a+1 x 2a+1 square)
1778 * - encoding: Set by user.
1779 * - decoding: unused
1781 int last_predictor_count;
1784 * prepass for motion estimation
1785 * - encoding: Set by user.
1786 * - decoding: unused
1791 * motion estimation prepass comparison function
1792 * - encoding: Set by user.
1793 * - decoding: unused
1798 * ME prepass diamond size & shape
1799 * - encoding: Set by user.
1800 * - decoding: unused
1806 * - encoding: Set by user.
1807 * - decoding: unused
1809 int me_subpel_quality;
1812 * callback to negotiate the pixelFormat
1813 * @param fmt is the list of formats which are supported by the codec,
1814 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1815 * The first is always the native one.
1816 * @return the chosen format
1817 * - encoding: unused
1818 * - decoding: Set by user, if not set the native format will be chosen.
1820 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1823 * DTG active format information (additional aspect ratio
1824 * information only used in DVB MPEG-2 transport streams)
1827 * - encoding: unused
1828 * - decoding: Set by decoder.
1830 int dtg_active_format;
1831 #define FF_DTG_AFD_SAME 8
1832 #define FF_DTG_AFD_4_3 9
1833 #define FF_DTG_AFD_16_9 10
1834 #define FF_DTG_AFD_14_9 11
1835 #define FF_DTG_AFD_4_3_SP_14_9 13
1836 #define FF_DTG_AFD_16_9_SP_14_9 14
1837 #define FF_DTG_AFD_SP_4_3 15
1840 * maximum motion estimation search range in subpel units
1841 * If 0 then no limit.
1843 * - encoding: Set by user.
1844 * - decoding: unused
1849 * intra quantizer bias
1850 * - encoding: Set by user.
1851 * - decoding: unused
1853 int intra_quant_bias;
1854 #define FF_DEFAULT_QUANT_BIAS 999999
1857 * inter quantizer bias
1858 * - encoding: Set by user.
1859 * - decoding: unused
1861 int inter_quant_bias;
1865 * - encoding: unused
1866 * - decoding: Which clrtable should be used for 8bit RGB images.
1867 * Tables have to be stored somewhere. FIXME
1872 * internal_buffer count
1873 * Don't touch, used by libavcodec default_get_buffer().
1875 int internal_buffer_count;
1879 * Don't touch, used by libavcodec default_get_buffer().
1881 void *internal_buffer;
1883 #define FF_LAMBDA_SHIFT 7
1884 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1885 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1886 #define FF_LAMBDA_MAX (256*128-1)
1888 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1890 * Global quality for codecs which cannot change it per frame.
1891 * This should be proportional to MPEG-1/2/4 qscale.
1892 * - encoding: Set by user.
1893 * - decoding: unused
1897 #define FF_CODER_TYPE_VLC 0
1898 #define FF_CODER_TYPE_AC 1
1899 #define FF_CODER_TYPE_RAW 2
1900 #define FF_CODER_TYPE_RLE 3
1901 #define FF_CODER_TYPE_DEFLATE 4
1904 * - encoding: Set by user.
1905 * - decoding: unused
1911 * - encoding: Set by user.
1912 * - decoding: unused
1918 * - encoding: unused
1919 * - decoding: Set by user.
1921 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1926 * - encoding: unused
1927 * - decoding: Set by user.
1930 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1931 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1932 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1935 * XVideo Motion Acceleration
1936 * - encoding: forbidden
1937 * - decoding: set by decoder
1939 int xvmc_acceleration;
1942 * macroblock decision mode
1943 * - encoding: Set by user.
1944 * - decoding: unused
1947 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1948 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1949 #define FF_MB_DECISION_RD 2 ///< rate distortion
1952 * custom intra quantization matrix
1953 * - encoding: Set by user, can be NULL.
1954 * - decoding: Set by libavcodec.
1956 uint16_t *intra_matrix;
1959 * custom inter quantization matrix
1960 * - encoding: Set by user, can be NULL.
1961 * - decoding: Set by libavcodec.
1963 uint16_t *inter_matrix;
1966 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1967 * This is used to work around some encoder bugs.
1968 * - encoding: unused
1969 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1971 unsigned int stream_codec_tag;
1974 * scene change detection threshold
1975 * 0 is default, larger means fewer detected scene changes.
1976 * - encoding: Set by user.
1977 * - decoding: unused
1979 int scenechange_threshold;
1982 * minimum Lagrange multipler
1983 * - encoding: Set by user.
1984 * - decoding: unused
1989 * maximum Lagrange multipler
1990 * - encoding: Set by user.
1991 * - decoding: unused
1996 * palette control structure
1997 * - encoding: ??? (no palette-enabled encoder yet)
1998 * - decoding: Set by user.
2000 struct AVPaletteControl *palctrl;
2003 * noise reduction strength
2004 * - encoding: Set by user.
2005 * - decoding: unused
2007 int noise_reduction;
2010 * Called at the beginning of a frame to get cr buffer for it.
2011 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2012 * libavcodec will pass previous buffer in pic, function should return
2013 * same buffer or new buffer with old frame "painted" into it.
2014 * If pic.data[0] == NULL must behave like get_buffer().
2015 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2016 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2018 * - encoding: unused
2019 * - decoding: Set by libavcodec., user can override
2021 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2024 * Number of bits which should be loaded into the rc buffer before decoding starts.
2025 * - encoding: Set by user.
2026 * - decoding: unused
2028 int rc_initial_buffer_occupancy;
2032 * - encoding: Set by user.
2033 * - decoding: unused
2035 int inter_threshold;
2039 * - encoding: Set by user.
2040 * - decoding: Set by user.
2045 * Simulates errors in the bitstream to test error concealment.
2046 * - encoding: Set by user.
2047 * - decoding: unused
2052 * MP3 antialias algorithm, see FF_AA_* below.
2053 * - encoding: unused
2054 * - decoding: Set by user.
2057 #define FF_AA_AUTO 0
2058 #define FF_AA_FASTINT 1 //not implemented yet
2060 #define FF_AA_FLOAT 3
2062 * quantizer noise shaping
2063 * - encoding: Set by user.
2064 * - decoding: unused
2066 int quantizer_noise_shaping;
2070 * is used to decide how many independent tasks should be passed to execute()
2071 * - encoding: Set by user.
2072 * - decoding: Set by user.
2077 * The codec may call this to execute several independent things.
2078 * It will return only after finishing all tasks.
2079 * The user may replace this with some multithreaded implementation,
2080 * the default implementation will execute the parts serially.
2081 * @param count the number of things to execute
2082 * - encoding: Set by libavcodec, user can override.
2083 * - decoding: Set by libavcodec, user can override.
2085 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2089 * Can be used by execute() to store some per AVCodecContext stuff.
2090 * - encoding: set by execute()
2091 * - decoding: set by execute()
2093 void *thread_opaque;
2096 * Motion estimation threshold below which no motion estimation is
2097 * performed, but instead the user specified motion vectors are used.
2099 * - encoding: Set by user.
2100 * - decoding: unused
2105 * Macroblock threshold below which the user specified macroblock types will be used.
2106 * - encoding: Set by user.
2107 * - decoding: unused
2112 * precision of the intra DC coefficient - 8
2113 * - encoding: Set by user.
2114 * - decoding: unused
2116 int intra_dc_precision;
2119 * noise vs. sse weight for the nsse comparsion function
2120 * - encoding: Set by user.
2121 * - decoding: unused
2126 * Number of macroblock rows at the top which are skipped.
2127 * - encoding: unused
2128 * - decoding: Set by user.
2133 * Number of macroblock rows at the bottom which are skipped.
2134 * - encoding: unused
2135 * - decoding: Set by user.
2141 * - encoding: Set by user.
2142 * - decoding: Set by libavcodec.
2145 #define FF_PROFILE_UNKNOWN -99
2147 #define FF_PROFILE_AAC_MAIN 0
2148 #define FF_PROFILE_AAC_LOW 1
2149 #define FF_PROFILE_AAC_SSR 2
2150 #define FF_PROFILE_AAC_LTP 3
2152 #define FF_PROFILE_H264_BASELINE 66
2153 #define FF_PROFILE_H264_MAIN 77
2154 #define FF_PROFILE_H264_EXTENDED 88
2155 #define FF_PROFILE_H264_HIGH 100
2156 #define FF_PROFILE_H264_HIGH_10 110
2157 #define FF_PROFILE_H264_HIGH_422 122
2158 #define FF_PROFILE_H264_HIGH_444 244
2159 #define FF_PROFILE_H264_CAVLC_444 44
2163 * - encoding: Set by user.
2164 * - decoding: Set by libavcodec.
2167 #define FF_LEVEL_UNKNOWN -99
2170 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2171 * - encoding: unused
2172 * - decoding: Set by user.
2177 * Bitstream width / height, may be different from width/height if lowres
2178 * or other things are used.
2179 * - encoding: unused
2180 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2182 int coded_width, coded_height;
2185 * frame skip threshold
2186 * - encoding: Set by user.
2187 * - decoding: unused
2189 int frame_skip_threshold;
2193 * - encoding: Set by user.
2194 * - decoding: unused
2196 int frame_skip_factor;
2199 * frame skip exponent
2200 * - encoding: Set by user.
2201 * - decoding: unused
2206 * frame skip comparison function
2207 * - encoding: Set by user.
2208 * - decoding: unused
2213 * Border processing masking, raises the quantizer for mbs on the borders
2215 * - encoding: Set by user.
2216 * - decoding: unused
2218 float border_masking;
2221 * minimum MB lagrange multipler
2222 * - encoding: Set by user.
2223 * - decoding: unused
2228 * maximum MB lagrange multipler
2229 * - encoding: Set by user.
2230 * - decoding: unused
2236 * - encoding: Set by user.
2237 * - decoding: unused
2239 int me_penalty_compensation;
2243 * - encoding: unused
2244 * - decoding: Set by user.
2246 enum AVDiscard skip_loop_filter;
2250 * - encoding: unused
2251 * - decoding: Set by user.
2253 enum AVDiscard skip_idct;
2257 * - encoding: unused
2258 * - decoding: Set by user.
2260 enum AVDiscard skip_frame;
2264 * - encoding: Set by user.
2265 * - decoding: unused
2271 * - encoding: Set by user.
2272 * - decoding: unused
2277 * constant rate factor - quality-based VBR - values ~correspond to qps
2278 * - encoding: Set by user.
2279 * - decoding: unused
2284 * constant quantization parameter rate control method
2285 * - encoding: Set by user.
2286 * - decoding: unused
2292 * - encoding: Set by user.
2293 * - decoding: unused
2298 * number of reference frames
2299 * - encoding: Set by user.
2300 * - decoding: Set by lavc.
2305 * chroma qp offset from luma
2306 * - encoding: Set by user.
2307 * - decoding: unused
2312 * Influences how often B-frames are used.
2313 * - encoding: Set by user.
2314 * - decoding: unused
2319 * trellis RD quantization
2320 * - encoding: Set by user.
2321 * - decoding: unused
2326 * Reduce fluctuations in qp (before curve compression).
2327 * - encoding: Set by user.
2328 * - decoding: unused
2330 float complexityblur;
2333 * in-loop deblocking filter alphac0 parameter
2334 * alpha is in the range -6...6
2335 * - encoding: Set by user.
2336 * - decoding: unused
2341 * in-loop deblocking filter beta parameter
2342 * beta is in the range -6...6
2343 * - encoding: Set by user.
2344 * - decoding: unused
2349 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2350 * - encoding: Set by user.
2351 * - decoding: unused
2354 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2355 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2356 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2357 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2358 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2361 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2362 * - encoding: Set by user.
2363 * - decoding: unused
2368 * Audio cutoff bandwidth (0 means "automatic")
2369 * - encoding: Set by user.
2370 * - decoding: unused
2375 * Multiplied by qscale for each frame and added to scene_change_score.
2376 * - encoding: Set by user.
2377 * - decoding: unused
2379 int scenechange_factor;
2383 * Note: Value depends upon the compare function used for fullpel ME.
2384 * - encoding: Set by user.
2385 * - decoding: unused
2390 * Adjusts sensitivity of b_frame_strategy 1.
2391 * - encoding: Set by user.
2392 * - decoding: unused
2397 * - encoding: Set by user.
2398 * - decoding: unused
2400 int compression_level;
2401 #define FF_COMPRESSION_DEFAULT -1
2404 * Sets whether to use LPC mode - used by FLAC encoder.
2405 * - encoding: Set by user.
2406 * - decoding: unused
2411 * LPC coefficient precision - used by FLAC encoder
2412 * - encoding: Set by user.
2413 * - decoding: unused
2415 int lpc_coeff_precision;
2418 * - encoding: Set by user.
2419 * - decoding: unused
2421 int min_prediction_order;
2424 * - encoding: Set by user.
2425 * - decoding: unused
2427 int max_prediction_order;
2430 * search method for selecting prediction order
2431 * - encoding: Set by user.
2432 * - decoding: unused
2434 int prediction_order_method;
2437 * - encoding: Set by user.
2438 * - decoding: unused
2440 int min_partition_order;
2443 * - encoding: Set by user.
2444 * - decoding: unused
2446 int max_partition_order;
2449 * GOP timecode frame start number, in non drop frame format
2450 * - encoding: Set by user.
2451 * - decoding: unused
2453 int64_t timecode_frame_start;
2455 #if LIBAVCODEC_VERSION_MAJOR < 53
2457 * Decoder should decode to this many channels if it can (0 for default)
2458 * - encoding: unused
2459 * - decoding: Set by user.
2460 * @deprecated Deprecated in favor of request_channel_layout.
2462 int request_channels;
2466 * Percentage of dynamic range compression to be applied by the decoder.
2467 * The default value is 1.0, corresponding to full compression.
2468 * - encoding: unused
2469 * - decoding: Set by user.
2474 * opaque 64bit number (generally a PTS) that will be reordered and
2475 * output in AVFrame.reordered_opaque
2476 * - encoding: unused
2477 * - decoding: Set by user.
2479 int64_t reordered_opaque;
2482 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2483 * This field is applicable only when sample_fmt is SAMPLE_FMT_S32.
2484 * - encoding: set by user.
2485 * - decoding: set by libavcodec.
2487 int bits_per_raw_sample;
2490 * Audio channel layout.
2491 * - encoding: set by user.
2492 * - decoding: set by libavcodec.
2494 int64_t channel_layout;
2497 * Request decoder to use this channel layout if it can (0 for default)
2498 * - encoding: unused
2499 * - decoding: Set by user.
2501 int64_t request_channel_layout;
2504 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2505 * - encoding: Set by user.
2506 * - decoding: unused.
2508 float rc_max_available_vbv_use;
2511 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2512 * - encoding: Set by user.
2513 * - decoding: unused.
2515 float rc_min_vbv_overflow_use;
2518 * Hardware accelerator in use
2519 * - encoding: unused.
2520 * - decoding: Set by libavcodec
2522 struct AVHWAccel *hwaccel;
2525 * For some codecs, the time base is closer to the field rate than the frame rate.
2526 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2527 * if no telecine is used ...
2529 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2531 int ticks_per_frame;
2534 * Hardware accelerator context.
2535 * For some hardware accelerators, a global context needs to be
2536 * provided by the user. In that case, this holds display-dependent
2537 * data FFmpeg cannot instantiate itself. Please refer to the
2538 * FFmpeg HW accelerator documentation to know how to fill this
2539 * is. e.g. for VA API, this is a struct vaapi_context.
2540 * - encoding: unused
2541 * - decoding: Set by user
2543 void *hwaccel_context;
2546 * Chromaticity coordinates of the source primaries.
2547 * - encoding: Set by user
2548 * - decoding: Set by libavcodec
2550 enum AVColorPrimaries color_primaries;
2553 * Color Transfer Characteristic.
2554 * - encoding: Set by user
2555 * - decoding: Set by libavcodec
2557 enum AVColorTransferCharacteristic color_trc;
2560 * YUV colorspace type.
2561 * - encoding: Set by user
2562 * - decoding: Set by libavcodec
2564 enum AVColorSpace colorspace;
2567 * MPEG vs JPEG YUV range.
2568 * - encoding: Set by user
2569 * - decoding: Set by libavcodec
2571 enum AVColorRange color_range;
2574 * This defines the location of chroma samples.
2575 * - encoding: Set by user
2576 * - decoding: Set by libavcodec
2578 enum AVChromaLocation chroma_sample_location;
2581 * The codec may call this to execute several independent things.
2582 * It will return only after finishing all tasks.
2583 * The user may replace this with some multithreaded implementation,
2584 * the default implementation will execute the parts serially.
2585 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2586 * @param c context passed also to func
2587 * @param count the number of things to execute
2588 * @param arg2 argument passed unchanged to func
2589 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2590 * @param func function that will be called count times, with jobnr from 0 to count-1.
2591 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2592 * two instances of func executing at the same time will have the same threadnr.
2593 * @return always 0 currently, but code should handle a future improvement where when any call to func
2594 * returns < 0 no further calls to func may be done and < 0 is returned.
2595 * - encoding: Set by libavcodec, user can override.
2596 * - decoding: Set by libavcodec, user can override.
2598 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2601 * explicit P-frame weighted prediction analysis method
2603 * 1: fast blind weighting (one reference duplicate with -1 offset)
2604 * 2: smart weighting (full fade detection analysis)
2605 * - encoding: Set by user.
2606 * - decoding: unused
2608 int weighted_p_pred;
2613 * 1: Variance AQ (complexity mask)
2614 * 2: Auto-variance AQ (experimental)
2615 * - encoding: Set by user
2616 * - decoding: unused
2622 * Reduces blocking and blurring in flat and textured areas.
2623 * - encoding: Set by user
2624 * - decoding: unused
2630 * Strength of psychovisual optimization
2631 * - encoding: Set by user
2632 * - decoding: unused
2638 * Strength of psychovisual optimization
2639 * - encoding: Set by user
2640 * - decoding: unused
2646 * Number of frames for frametype and ratecontrol lookahead
2647 * - encoding: Set by user
2648 * - decoding: unused
2653 * Constant rate factor maximum
2654 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2655 * than crf_max, even if doing so would violate VBV restrictions.
2656 * - encoding: Set by user.
2657 * - decoding: unused
2661 int log_level_offset;
2667 typedef struct AVCodec {
2669 * Name of the codec implementation.
2670 * The name is globally unique among encoders and among decoders (but an
2671 * encoder and a decoder can share the same name).
2672 * This is the primary way to find a codec from the user perspective.
2675 enum AVMediaType type;
2678 int (*init)(AVCodecContext *);
2679 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2680 int (*close)(AVCodecContext *);
2681 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2683 * Codec capabilities.
2687 struct AVCodec *next;
2690 * Will be called when seeking
2692 void (*flush)(AVCodecContext *);
2693 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2694 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2696 * Descriptive name for the codec, meant to be more human readable than name.
2697 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2699 const char *long_name;
2700 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2701 const enum SampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2702 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2708 typedef struct AVHWAccel {
2710 * Name of the hardware accelerated codec.
2711 * The name is globally unique among encoders and among decoders (but an
2712 * encoder and a decoder can share the same name).
2717 * Type of codec implemented by the hardware accelerator.
2719 * See AVMEDIA_TYPE_xxx
2721 enum AVMediaType type;
2724 * Codec implemented by the hardware accelerator.
2731 * Supported pixel format.
2733 * Only hardware accelerated formats are supported here.
2735 enum PixelFormat pix_fmt;
2738 * Hardware accelerated codec capabilities.
2739 * see FF_HWACCEL_CODEC_CAP_*
2743 struct AVHWAccel *next;
2746 * Called at the beginning of each frame or field picture.
2748 * Meaningful frame information (codec specific) is guaranteed to
2749 * be parsed at this point. This function is mandatory.
2751 * Note that buf can be NULL along with buf_size set to 0.
2752 * Otherwise, this means the whole frame is available at this point.
2754 * @param avctx the codec context
2755 * @param buf the frame data buffer base
2756 * @param buf_size the size of the frame in bytes
2757 * @return zero if successful, a negative value otherwise
2759 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2762 * Callback for each slice.
2764 * Meaningful slice information (codec specific) is guaranteed to
2765 * be parsed at this point. This function is mandatory.
2767 * @param avctx the codec context
2768 * @param buf the slice data buffer base
2769 * @param buf_size the size of the slice in bytes
2770 * @return zero if successful, a negative value otherwise
2772 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2775 * Called at the end of each frame or field picture.
2777 * The whole picture is parsed at this point and can now be sent
2778 * to the hardware accelerator. This function is mandatory.
2780 * @param avctx the codec context
2781 * @return zero if successful, a negative value otherwise
2783 int (*end_frame)(AVCodecContext *avctx);
2786 * Size of HW accelerator private data.
2788 * Private data is allocated with av_mallocz() before
2789 * AVCodecContext.get_buffer() and deallocated after
2790 * AVCodecContext.release_buffer().
2796 * four components are given, that's all.
2797 * the last component is alpha
2799 typedef struct AVPicture {
2801 int linesize[4]; ///< number of bytes per line
2804 #if LIBAVCODEC_VERSION_MAJOR < 53
2807 * This structure defines a method for communicating palette changes
2808 * between and demuxer and a decoder.
2810 * @deprecated Use AVPacket to send palette changes instead.
2811 * This is totally broken.
2813 #define AVPALETTE_SIZE 1024
2814 #define AVPALETTE_COUNT 256
2815 typedef struct AVPaletteControl {
2817 /* Demuxer sets this to 1 to indicate the palette has changed;
2818 * decoder resets to 0. */
2819 int palette_changed;
2821 /* 4-byte ARGB palette entries, stored in native byte order; note that
2822 * the individual palette components should be on a 8-bit scale; if
2823 * the palette data comes from an IBM VGA native format, the component
2824 * data is probably 6 bits in size and needs to be scaled. */
2825 unsigned int palette[AVPALETTE_COUNT];
2827 } AVPaletteControl attribute_deprecated;
2830 enum AVSubtitleType {
2833 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2836 * Plain text, the text field must be set by the decoder and is
2837 * authoritative. ass and pict fields may contain approximations.
2842 * Formatted text, the ass field must be set by the decoder and is
2843 * authoritative. pict and text fields may contain approximations.
2848 typedef struct AVSubtitleRect {
2849 int x; ///< top left corner of pict, undefined when pict is not set
2850 int y; ///< top left corner of pict, undefined when pict is not set
2851 int w; ///< width of pict, undefined when pict is not set
2852 int h; ///< height of pict, undefined when pict is not set
2853 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2856 * data+linesize for the bitmap of this subtitle.
2857 * can be set for text/ass as well once they where rendered
2860 enum AVSubtitleType type;
2862 char *text; ///< 0 terminated plain UTF-8 text
2865 * 0 terminated ASS/SSA compatible event line.
2866 * The pressentation of this is unaffected by the other values in this
2872 typedef struct AVSubtitle {
2873 uint16_t format; /* 0 = graphics */
2874 uint32_t start_display_time; /* relative to packet pts, in ms */
2875 uint32_t end_display_time; /* relative to packet pts, in ms */
2877 AVSubtitleRect **rects;
2878 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2881 /* packet functions */
2884 * @deprecated use NULL instead
2886 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
2889 * Default packet destructor.
2891 void av_destruct_packet(AVPacket *pkt);
2894 * Initialize optional fields of a packet with default values.
2898 void av_init_packet(AVPacket *pkt);
2901 * Allocate the payload of a packet and initialize its fields with
2905 * @param size wanted payload size
2906 * @return 0 if OK, AVERROR_xxx otherwise
2908 int av_new_packet(AVPacket *pkt, int size);
2911 * Reduce packet size, correctly zeroing padding
2914 * @param size new size
2916 void av_shrink_packet(AVPacket *pkt, int size);
2919 * @warning This is a hack - the packet memory allocation stuff is broken. The
2920 * packet is allocated if it was not really allocated.
2922 int av_dup_packet(AVPacket *pkt);
2927 * @param pkt packet to free
2929 void av_free_packet(AVPacket *pkt);
2933 struct ReSampleContext;
2934 struct AVResampleContext;
2936 typedef struct ReSampleContext ReSampleContext;
2938 #if LIBAVCODEC_VERSION_MAJOR < 53
2940 * @deprecated Use av_audio_resample_init() instead.
2942 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2943 int output_rate, int input_rate);
2946 * Initializes audio resampling context
2948 * @param output_channels number of output channels
2949 * @param input_channels number of input channels
2950 * @param output_rate output sample rate
2951 * @param input_rate input sample rate
2952 * @param sample_fmt_out requested output sample format
2953 * @param sample_fmt_in input sample format
2954 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2955 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2956 * @param linear If 1 then the used FIR filter will be linearly interpolated
2957 between the 2 closest, if 0 the closest will be used
2958 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2959 * @return allocated ReSampleContext, NULL if error occured
2961 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
2962 int output_rate, int input_rate,
2963 enum SampleFormat sample_fmt_out,
2964 enum SampleFormat sample_fmt_in,
2965 int filter_length, int log2_phase_count,
2966 int linear, double cutoff);
2968 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2969 void audio_resample_close(ReSampleContext *s);
2973 * Initializes an audio resampler.
2974 * Note, if either rate is not an integer then simply scale both rates up so they are.
2975 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
2976 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
2977 * @param linear If 1 then the used FIR filter will be linearly interpolated
2978 between the 2 closest, if 0 the closest will be used
2979 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
2981 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2985 * @param src an array of unconsumed samples
2986 * @param consumed the number of samples of src which have been consumed are returned here
2987 * @param src_size the number of unconsumed samples available
2988 * @param dst_size the amount of space in samples available in dst
2989 * @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.
2990 * @return the number of samples written in dst or -1 if an error occurred
2992 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2996 * Compensates samplerate/timestamp drift. The compensation is done by changing
2997 * the resampler parameters, so no audible clicks or similar distortions occur
2998 * @param compensation_distance distance in output samples over which the compensation should be performed
2999 * @param sample_delta number of output samples which should be output less
3001 * example: av_resample_compensate(c, 10, 500)
3002 * here instead of 510 samples only 500 samples would be output
3004 * note, due to rounding the actual compensation might be slightly different,
3005 * especially if the compensation_distance is large and the in_rate used during init is small
3007 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3008 void av_resample_close(struct AVResampleContext *c);
3011 * Allocate memory for a picture. Call avpicture_free to free it.
3013 * @param picture the picture to be filled in
3014 * @param pix_fmt the format of the picture
3015 * @param width the width of the picture
3016 * @param height the height of the picture
3017 * @return zero if successful, a negative value if not
3019 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3022 * Free a picture previously allocated by avpicture_alloc().
3024 * @param picture the AVPicture to be freed
3026 void avpicture_free(AVPicture *picture);
3029 * Fill in the AVPicture fields.
3030 * The fields of the given AVPicture are filled in by using the 'ptr' address
3031 * which points to the image data buffer. Depending on the specified picture
3032 * format, one or multiple image data pointers and line sizes will be set.
3033 * If a planar format is specified, several pointers will be set pointing to
3034 * the different picture planes and the line sizes of the different planes
3035 * will be stored in the lines_sizes array.
3036 * Call with ptr == NULL to get the required size for the ptr buffer.
3038 * @param picture AVPicture whose fields are to be filled in
3039 * @param ptr Buffer which will contain or contains the actual image data
3040 * @param pix_fmt The format in which the picture data is stored.
3041 * @param width the width of the image in pixels
3042 * @param height the height of the image in pixels
3043 * @return size of the image data in bytes
3045 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3046 enum PixelFormat pix_fmt, int width, int height);
3047 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3048 unsigned char *dest, int dest_size);
3051 * Calculate the size in bytes that a picture of the given width and height
3052 * would occupy if stored in the given picture format.
3053 * Note that this returns the size of a compact representation as generated
3054 * by avpicture_layout, which can be smaller than the size required for e.g.
3057 * @param pix_fmt the given picture format
3058 * @param width the width of the image
3059 * @param height the height of the image
3060 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3062 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3063 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3064 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3065 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3067 #if LIBAVCODEC_VERSION_MAJOR < 53
3069 * Returns the pixel format corresponding to the name name.
3071 * If there is no pixel format with name name, then looks for a
3072 * pixel format with the name corresponding to the native endian
3074 * For example in a little-endian system, first looks for "gray16",
3075 * then for "gray16le".
3077 * Finally if no pixel format has been found, returns PIX_FMT_NONE.
3079 * @deprecated Deprecated in favor of av_get_pix_fmt().
3081 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3085 * Returns a value representing the fourCC code associated to the
3086 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3089 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3091 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3092 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3093 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3094 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3095 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3096 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3099 * Computes what kind of losses will occur when converting from one specific
3100 * pixel format to another.
3101 * When converting from one pixel format to another, information loss may occur.
3102 * For example, when converting from RGB24 to GRAY, the color information will
3103 * be lost. Similarly, other losses occur when converting from some formats to
3104 * other formats. These losses can involve loss of chroma, but also loss of
3105 * resolution, loss of color depth, loss due to the color space conversion, loss
3106 * of the alpha bits or loss due to color quantization.
3107 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3108 * which will occur when converting from one pixel format to another.
3110 * @param[in] dst_pix_fmt destination pixel format
3111 * @param[in] src_pix_fmt source pixel format
3112 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3113 * @return Combination of flags informing you what kind of losses will occur.
3115 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3119 * Finds the best pixel format to convert to given a certain source pixel
3120 * format. When converting from one pixel format to another, information loss
3121 * may occur. For example, when converting from RGB24 to GRAY, the color
3122 * information will be lost. Similarly, other losses occur when converting from
3123 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3124 * the given pixel formats should be used to suffer the least amount of loss.
3125 * The pixel formats from which it chooses one, are determined by the
3126 * pix_fmt_mask parameter.
3129 * src_pix_fmt = PIX_FMT_YUV420P;
3130 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3131 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3134 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3135 * @param[in] src_pix_fmt source pixel format
3136 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3137 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3138 * @return The best pixel format to convert to or -1 if none was found.
3140 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3141 int has_alpha, int *loss_ptr);
3145 * Print in buf the string corresponding to the pixel format with
3146 * number pix_fmt, or an header if pix_fmt is negative.
3148 * @param[in] buf the buffer where to write the string
3149 * @param[in] buf_size the size of buf
3150 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
3151 * a negative value to print the corresponding header.
3152 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
3154 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3156 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3157 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3160 * Tell if an image really has transparent alpha values.
3161 * @return ored mask of FF_ALPHA_xxx constants
3163 int img_get_alpha_info(const AVPicture *src,
3164 enum PixelFormat pix_fmt, int width, int height);
3166 /* deinterlace a picture */
3167 /* deinterlace - if not supported return -1 */
3168 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3169 enum PixelFormat pix_fmt, int width, int height);
3171 /* external high level API */
3174 * If c is NULL, returns the first registered codec,
3175 * if c is non-NULL, returns the next registered codec after c,
3176 * or NULL if c is the last one.
3178 AVCodec *av_codec_next(AVCodec *c);
3181 * Returns the LIBAVCODEC_VERSION_INT constant.
3183 unsigned avcodec_version(void);
3186 * Returns the libavcodec build-time configuration.
3188 const char *avcodec_configuration(void);
3191 * Returns the libavcodec license.
3193 const char *avcodec_license(void);
3196 * Initializes libavcodec.
3198 * @warning This function must be called before any other libavcodec
3201 void avcodec_init(void);
3203 #if LIBAVCODEC_VERSION_MAJOR < 53
3205 * @deprecated Deprecated in favor of avcodec_register().
3207 attribute_deprecated void register_avcodec(AVCodec *codec);
3211 * Register the codec codec and initialize libavcodec.
3213 * @see avcodec_init()
3215 void avcodec_register(AVCodec *codec);
3218 * Finds a registered encoder with a matching codec ID.
3220 * @param id CodecID of the requested encoder
3221 * @return An encoder if one was found, NULL otherwise.
3223 AVCodec *avcodec_find_encoder(enum CodecID id);
3226 * Finds a registered encoder with the specified name.
3228 * @param name name of the requested encoder
3229 * @return An encoder if one was found, NULL otherwise.
3231 AVCodec *avcodec_find_encoder_by_name(const char *name);
3234 * Finds a registered decoder with a matching codec ID.
3236 * @param id CodecID of the requested decoder
3237 * @return A decoder if one was found, NULL otherwise.
3239 AVCodec *avcodec_find_decoder(enum CodecID id);
3242 * Finds a registered decoder with the specified name.
3244 * @param name name of the requested decoder
3245 * @return A decoder if one was found, NULL otherwise.
3247 AVCodec *avcodec_find_decoder_by_name(const char *name);
3248 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3251 * Sets the fields of the given AVCodecContext to default values.
3253 * @param s The AVCodecContext of which the fields should be set to default values.
3255 void avcodec_get_context_defaults(AVCodecContext *s);
3257 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3258 * we WILL change its arguments and name a few times! */
3259 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3262 * Allocates an AVCodecContext and sets its fields to default values. The
3263 * resulting struct can be deallocated by simply calling av_free().
3265 * @return An AVCodecContext filled with default values or NULL on failure.
3266 * @see avcodec_get_context_defaults
3268 AVCodecContext *avcodec_alloc_context(void);
3270 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3271 * we WILL change its arguments and name a few times! */
3272 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3275 * Copy the settings of the source AVCodecContext into the destination
3276 * AVCodecContext. The resulting destination codec context will be
3277 * unopened, i.e. you are required to call avcodec_open() before you
3278 * can use this AVCodecContext to decode/encode video/audio data.
3280 * @param dest target codec context, should be initialized with
3281 * avcodec_alloc_context(), but otherwise uninitialized
3282 * @param src source codec context
3283 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3285 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3288 * Sets the fields of the given AVFrame to default values.
3290 * @param pic The AVFrame of which the fields should be set to default values.
3292 void avcodec_get_frame_defaults(AVFrame *pic);
3295 * Allocates an AVFrame and sets its fields to default values. The resulting
3296 * struct can be deallocated by simply calling av_free().
3298 * @return An AVFrame filled with default values or NULL on failure.
3299 * @see avcodec_get_frame_defaults
3301 AVFrame *avcodec_alloc_frame(void);
3303 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3304 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3305 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3308 * Returns the amount of padding in pixels which the get_buffer callback must
3309 * provide around the edge of the image for codecs which do not have the
3310 * CODEC_FLAG_EMU_EDGE flag.
3312 * @return Required padding in pixels.
3314 unsigned avcodec_get_edge_width(void);
3316 * Modifies width and height values so that they will result in a memory
3317 * buffer that is acceptable for the codec if you do not use any horizontal
3320 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3322 * Modifies width and height values so that they will result in a memory
3323 * buffer that is acceptable for the codec if you also ensure that all
3324 * line sizes are a multiple of the respective linesize_align[i].
3326 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3327 int linesize_align[4]);
3330 * Checks if the given dimension of a picture is valid, meaning that all
3331 * bytes of the picture can be addressed with a signed int.
3333 * @param[in] w Width of the picture.
3334 * @param[in] h Height of the picture.
3335 * @return Zero if valid, a negative value if invalid.
3337 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3338 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3340 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3341 void avcodec_thread_free(AVCodecContext *s);
3342 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3343 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3344 //FIXME func typedef
3347 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
3348 * function the context has to be allocated.
3350 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3351 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3352 * retrieving a codec.
3354 * @warning This function is not thread safe!
3357 * avcodec_register_all();
3358 * codec = avcodec_find_decoder(CODEC_ID_H264);
3362 * context = avcodec_alloc_context();
3364 * if (avcodec_open(context, codec) < 0)
3368 * @param avctx The context which will be set up to use the given codec.
3369 * @param codec The codec to use within the context.
3370 * @return zero on success, a negative value on error
3371 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3373 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3375 #if LIBAVCODEC_VERSION_MAJOR < 53
3377 * Decodes an audio frame from buf into samples.
3378 * Wrapper function which calls avcodec_decode_audio3.
3380 * @deprecated Use avcodec_decode_audio3 instead.
3381 * @param avctx the codec context
3382 * @param[out] samples the output buffer
3383 * @param[in,out] frame_size_ptr the output buffer size in bytes
3384 * @param[in] buf the input buffer
3385 * @param[in] buf_size the input buffer size in bytes
3386 * @return On error a negative value is returned, otherwise the number of bytes
3387 * used or zero if no frame could be decompressed.
3389 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3390 int *frame_size_ptr,
3391 const uint8_t *buf, int buf_size);
3395 * Decodes the audio frame of size avpkt->size from avpkt->data into samples.
3396 * Some decoders may support multiple frames in a single AVPacket, such
3397 * decoders would then just decode the first frame. In this case,
3398 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3399 * the remaining data in order to decode the second frame etc.
3401 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3402 * decompressed frame size in bytes.
3404 * @warning You must set frame_size_ptr to the allocated size of the
3405 * output buffer before calling avcodec_decode_audio3().
3407 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3408 * the actual read bytes because some optimized bitstream readers read 32 or 64
3409 * bits at once and could read over the end.
3411 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3412 * no overreading happens for damaged MPEG streams.
3414 * @note You might have to align the input buffer avpkt->data and output buffer
3415 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3416 * necessary at all, on others it won't work at all if not aligned and on others
3417 * it will work but it will have an impact on performance.
3419 * In practice, avpkt->data should have 4 byte alignment at minimum and
3420 * samples should be 16 byte aligned unless the CPU doesn't need it
3421 * (AltiVec and SSE do).
3423 * @param avctx the codec context
3424 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3425 * @param[in,out] frame_size_ptr the output buffer size in bytes
3426 * @param[in] avpkt The input AVPacket containing the input buffer.
3427 * You can create such packet with av_init_packet() and by then setting
3428 * data and size, some decoders might in addition need other fields.
3429 * All decoders are designed to use the least fields possible though.
3430 * @return On error a negative value is returned, otherwise the number of bytes
3431 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3433 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3434 int *frame_size_ptr,
3437 #if LIBAVCODEC_VERSION_MAJOR < 53
3439 * Decodes a video frame from buf into picture.
3440 * Wrapper function which calls avcodec_decode_video2.
3442 * @deprecated Use avcodec_decode_video2 instead.
3443 * @param avctx the codec context
3444 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3445 * @param[in] buf the input buffer
3446 * @param[in] buf_size the size of the input buffer in bytes
3447 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3448 * @return On error a negative value is returned, otherwise the number of bytes
3449 * used or zero if no frame could be decompressed.
3451 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3452 int *got_picture_ptr,
3453 const uint8_t *buf, int buf_size);
3457 * Decodes the video frame of size avpkt->size from avpkt->data into picture.
3458 * Some decoders may support multiple frames in a single AVPacket, such
3459 * decoders would then just decode the first frame.
3461 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3462 * the actual read bytes because some optimized bitstream readers read 32 or 64
3463 * bits at once and could read over the end.
3465 * @warning The end of the input buffer buf should be set to 0 to ensure that
3466 * no overreading happens for damaged MPEG streams.
3468 * @note You might have to align the input buffer avpkt->data.
3469 * The alignment requirements depend on the CPU: on some CPUs it isn't
3470 * necessary at all, on others it won't work at all if not aligned and on others
3471 * it will work but it will have an impact on performance.
3473 * In practice, avpkt->data should have 4 byte alignment at minimum.
3475 * @note Some codecs have a delay between input and output, these need to be
3476 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3478 * @param avctx the codec context
3479 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3480 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3481 * allocate memory for the actual bitmap.
3482 * @param[in] avpkt The input AVpacket containing the input buffer.
3483 * You can create such packet with av_init_packet() and by then setting
3484 * data and size, some decoders might in addition need other fields like
3485 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3487 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3488 * @return On error a negative value is returned, otherwise the number of bytes
3489 * used or zero if no frame could be decompressed.
3491 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3492 int *got_picture_ptr,
3495 #if LIBAVCODEC_VERSION_MAJOR < 53
3496 /* Decode a subtitle message. Return -1 if error, otherwise return the
3497 * number of bytes used. If no subtitle could be decompressed,
3498 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3499 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3501 const uint8_t *buf, int buf_size);
3505 * Decodes a subtitle message.
3506 * Returns a negative value on error, otherwise returns the number of bytes used.
3507 * If no subtitle could be decompressed, got_sub_ptr is zero.
3508 * Otherwise, the subtitle is stored in *sub.
3510 * @param avctx the codec context
3511 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored.
3512 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3513 * @param[in] avpkt The input AVPacket containing the input buffer.
3515 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3518 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3520 uint8_t *buf, int buf_size);
3523 * Encodes an audio frame from samples into buf.
3525 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3526 * However, for PCM audio the user will know how much space is needed
3527 * because it depends on the value passed in buf_size as described
3528 * below. In that case a lower value can be used.
3530 * @param avctx the codec context
3531 * @param[out] buf the output buffer
3532 * @param[in] buf_size the output buffer size
3533 * @param[in] samples the input buffer containing the samples
3534 * The number of samples read from this buffer is frame_size*channels,
3535 * both of which are defined in avctx.
3536 * For PCM audio the number of samples read from samples is equal to
3537 * buf_size * input_sample_size / output_sample_size.
3538 * @return On error a negative value is returned, on success zero or the number
3539 * of bytes used to encode the data read from the input buffer.
3541 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3542 const short *samples);
3545 * Encodes a video frame from pict into buf.
3546 * The input picture should be
3547 * stored using a specific format, namely avctx.pix_fmt.
3549 * @param avctx the codec context
3550 * @param[out] buf the output buffer for the bitstream of encoded frame
3551 * @param[in] buf_size the size of the output buffer in bytes
3552 * @param[in] pict the input picture to encode
3553 * @return On error a negative value is returned, on success zero or the number
3554 * of bytes used from the output buffer.
3556 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3557 const AVFrame *pict);
3558 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3559 const AVSubtitle *sub);
3561 int avcodec_close(AVCodecContext *avctx);
3564 * Register all the codecs, parsers and bitstream filters which were enabled at
3565 * configuration time. If you do not call this function you can select exactly
3566 * which formats you want to support, by using the individual registration
3569 * @see avcodec_register
3570 * @see av_register_codec_parser
3571 * @see av_register_bitstream_filter
3573 void avcodec_register_all(void);
3576 * Flush buffers, should be called when seeking or when switching to a different stream.
3578 void avcodec_flush_buffers(AVCodecContext *avctx);
3580 void avcodec_default_free_buffers(AVCodecContext *s);
3582 /* misc useful functions */
3585 * Returns a single letter to describe the given picture type pict_type.
3587 * @param[in] pict_type the picture type
3588 * @return A single character representing the picture type.
3590 char av_get_pict_type_char(int pict_type);
3593 * Returns codec bits per sample.
3595 * @param[in] codec_id the codec
3596 * @return Number of bits per sample or zero if unknown for the given codec.
3598 int av_get_bits_per_sample(enum CodecID codec_id);
3601 * Returns sample format bits per sample.
3603 * @param[in] sample_fmt the sample format
3604 * @return Number of bits per sample or zero if unknown for the given sample format.
3606 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
3609 typedef struct AVCodecParserContext {
3611 struct AVCodecParser *parser;
3612 int64_t frame_offset; /* offset of the current frame */
3613 int64_t cur_offset; /* current offset
3614 (incremented by each av_parser_parse()) */
3615 int64_t next_frame_offset; /* offset of the next frame */
3617 int pict_type; /* XXX: Put it back in AVCodecContext. */
3619 * This field is used for proper frame duration computation in lavf.
3620 * It signals, how much longer the frame duration of the current frame
3621 * is compared to normal frame duration.
3623 * frame_duration = (1 + repeat_pict) * time_base
3625 * It is used by codecs like H.264 to display telecined material.
3627 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3628 int64_t pts; /* pts of the current frame */
3629 int64_t dts; /* dts of the current frame */
3634 int fetch_timestamp;
3636 #define AV_PARSER_PTS_NB 4
3637 int cur_frame_start_index;
3638 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3639 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3640 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3643 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3645 int64_t offset; ///< byte offset from starting packet start
3646 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3649 * Set by parser to 1 for key frames and 0 for non-key frames.
3650 * It is initialized to -1, so if the parser doesn't set this flag,
3651 * old-style fallback using FF_I_TYPE picture type as key frames
3657 * Time difference in stream time base units from the pts of this
3658 * packet to the point at which the output from the decoder has converged
3659 * independent from the availability of previous frames. That is, the
3660 * frames are virtually identical no matter if decoding started from
3661 * the very first frame or from this keyframe.
3662 * Is AV_NOPTS_VALUE if unknown.
3663 * This field is not the display duration of the current frame.
3665 * The purpose of this field is to allow seeking in streams that have no
3666 * keyframes in the conventional sense. It corresponds to the
3667 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3668 * essential for some types of subtitle streams to ensure that all
3669 * subtitles are correctly displayed after seeking.
3671 int64_t convergence_duration;
3673 // Timestamp generation support:
3675 * Synchronization point for start of timestamp generation.
3677 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3680 * For example, this corresponds to presence of H.264 buffering period
3686 * Offset of the current timestamp against last timestamp sync point in
3687 * units of AVCodecContext.time_base.
3689 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3690 * contain a valid timestamp offset.
3692 * Note that the timestamp of sync point has usually a nonzero
3693 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3694 * the next frame after timestamp sync point will be usually 1.
3696 * For example, this corresponds to H.264 cpb_removal_delay.
3698 int dts_ref_dts_delta;
3701 * Presentation delay of current frame in units of AVCodecContext.time_base.
3703 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3704 * contain valid non-negative timestamp delta (presentation time of a frame
3705 * must not lie in the past).
3707 * This delay represents the difference between decoding and presentation
3708 * time of the frame.
3710 * For example, this corresponds to H.264 dpb_output_delay.
3715 * Position of the packet in file.
3717 * Analogous to cur_frame_pts/dts
3719 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3722 * Byte position of currently parsed frame in stream.
3727 * Previous frame byte position.
3730 } AVCodecParserContext;
3732 typedef struct AVCodecParser {
3733 int codec_ids[5]; /* several codec IDs are permitted */
3735 int (*parser_init)(AVCodecParserContext *s);
3736 int (*parser_parse)(AVCodecParserContext *s,
3737 AVCodecContext *avctx,
3738 const uint8_t **poutbuf, int *poutbuf_size,
3739 const uint8_t *buf, int buf_size);
3740 void (*parser_close)(AVCodecParserContext *s);
3741 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3742 struct AVCodecParser *next;
3745 AVCodecParser *av_parser_next(AVCodecParser *c);
3747 void av_register_codec_parser(AVCodecParser *parser);
3748 AVCodecParserContext *av_parser_init(int codec_id);
3750 #if LIBAVCODEC_VERSION_MAJOR < 53
3751 attribute_deprecated
3752 int av_parser_parse(AVCodecParserContext *s,
3753 AVCodecContext *avctx,
3754 uint8_t **poutbuf, int *poutbuf_size,
3755 const uint8_t *buf, int buf_size,
3756 int64_t pts, int64_t dts);
3762 * @param s parser context.
3763 * @param avctx codec context.
3764 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3765 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3766 * @param buf input buffer.
3767 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3768 * @param pts input presentation timestamp.
3769 * @param dts input decoding timestamp.
3770 * @param pos input byte position in stream.
3771 * @return the number of bytes of the input bitstream used.
3776 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3783 * decode_frame(data, size);
3787 int av_parser_parse2(AVCodecParserContext *s,
3788 AVCodecContext *avctx,
3789 uint8_t **poutbuf, int *poutbuf_size,
3790 const uint8_t *buf, int buf_size,
3791 int64_t pts, int64_t dts,
3794 int av_parser_change(AVCodecParserContext *s,
3795 AVCodecContext *avctx,
3796 uint8_t **poutbuf, int *poutbuf_size,
3797 const uint8_t *buf, int buf_size, int keyframe);
3798 void av_parser_close(AVCodecParserContext *s);
3801 typedef struct AVBitStreamFilterContext {
3803 struct AVBitStreamFilter *filter;
3804 AVCodecParserContext *parser;
3805 struct AVBitStreamFilterContext *next;
3806 } AVBitStreamFilterContext;
3809 typedef struct AVBitStreamFilter {
3812 int (*filter)(AVBitStreamFilterContext *bsfc,
3813 AVCodecContext *avctx, const char *args,
3814 uint8_t **poutbuf, int *poutbuf_size,
3815 const uint8_t *buf, int buf_size, int keyframe);
3816 void (*close)(AVBitStreamFilterContext *bsfc);
3817 struct AVBitStreamFilter *next;
3818 } AVBitStreamFilter;
3820 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3821 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3822 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3823 AVCodecContext *avctx, const char *args,
3824 uint8_t **poutbuf, int *poutbuf_size,
3825 const uint8_t *buf, int buf_size, int keyframe);
3826 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3828 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3833 * Reallocates the given block if it is not large enough, otherwise it
3838 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3841 * Allocates a buffer, reusing the given one if large enough.
3843 * Contrary to av_fast_realloc the current buffer contents might not be
3844 * preserved and on error the old buffer is freed, thus no special
3845 * handling to avoid memleaks is necessary.
3847 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
3848 * @param size size of the buffer *ptr points to
3849 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
3850 * *size 0 if an error occurred.
3852 void av_fast_malloc(void *ptr, unsigned int *size, unsigned int min_size);
3855 * Copy image 'src' to 'dst'.
3857 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3858 enum PixelFormat pix_fmt, int width, int height);
3861 * Crop image top and left side.
3863 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3864 enum PixelFormat pix_fmt, int top_band, int left_band);
3869 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
3870 int padtop, int padbottom, int padleft, int padright, int *color);
3873 * Encodes extradata length to a buffer. Used by xiph codecs.
3875 * @param s buffer to write to; must be at least (v/255+1) bytes long
3876 * @param v size of extradata in bytes
3877 * @return number of bytes written to the buffer.
3879 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
3882 * Parses str and put in width_ptr and height_ptr the detected values.
3884 * @return 0 in case of a successful parsing, a negative value otherwise
3885 * @param[in] str the string to parse: it has to be a string in the format
3886 * <width>x<height> or a valid video frame size abbreviation.
3887 * @param[in,out] width_ptr pointer to the variable which will contain the detected
3889 * @param[in,out] height_ptr pointer to the variable which will contain the detected
3890 * frame height value
3892 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
3895 * Parses str and put in frame_rate the detected values.
3897 * @return 0 in case of a successful parsing, a negative value otherwise
3898 * @param[in] str the string to parse: it has to be a string in the format
3899 * <frame_rate_num>/<frame_rate_den>, a float number or a valid video rate abbreviation
3900 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
3903 int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
3906 * Logs a generic warning message about a missing feature. This function is
3907 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
3908 * only, and would normally not be used by applications.
3909 * @param[in] avc a pointer to an arbitrary struct of which the first field is
3910 * a pointer to an AVClass struct
3911 * @param[in] feature string containing the name of the missing feature
3912 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
3913 * If want_sample is non-zero, additional verbage will be added to the log
3914 * message which tells the user how to report samples to the development
3917 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
3920 * Logs a generic warning message asking for a sample. This function is
3921 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
3922 * only, and would normally not be used by applications.
3923 * @param[in] avc a pointer to an arbitrary struct of which the first field is
3924 * a pointer to an AVClass struct
3925 * @param[in] msg string containing an optional message, or NULL if no message
3927 void av_log_ask_for_sample(void *avc, const char *msg);
3930 * Registers the hardware accelerator hwaccel.
3932 void av_register_hwaccel(AVHWAccel *hwaccel);
3935 * If hwaccel is NULL, returns the first registered hardware accelerator,
3936 * if hwaccel is non-NULL, returns the next registered hardware accelerator
3937 * after hwaccel, or NULL if hwaccel is the last one.
3939 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
3943 * Lock operation used by lockmgr
3946 AV_LOCK_CREATE, ///< Create a mutex
3947 AV_LOCK_OBTAIN, ///< Lock the mutex
3948 AV_LOCK_RELEASE, ///< Unlock the mutex
3949 AV_LOCK_DESTROY, ///< Free mutex resources
3953 * Register a user provided lock manager supporting the operations
3954 * specified by AVLockOp. mutex points to a (void *) where the
3955 * lockmgr should store/get a pointer to a user allocated mutex. It's
3956 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
3958 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
3959 * callback during the call to av_lockmgr_register().
3960 * Thus, the application must be prepared to handle that.
3961 * If cb is set to NULL the lockmgr will be unregistered.
3962 * Also note that during unregistration the previously registered
3963 * lockmgr callback may also be invoked.
3965 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
3967 #endif /* AVCODEC_AVCODEC_H */