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/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
34 #include "libavcodec/version.h"
37 * Identify the syntax and semantics of the bitstream.
38 * The principle is roughly:
39 * Two decoders with the same ID can decode the same streams.
40 * Two encoders with the same ID can encode compatible streams.
41 * There may be slight deviations from the principle due to implementation
44 * If you add a codec ID to this list, add it so that
45 * 1. no value of a existing codec ID changes (that would break ABI),
46 * 2. it is as close as possible to similar codecs.
53 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
54 CODEC_ID_MPEG2VIDEO_XVMC,
91 CODEC_ID_INTERPLAY_VIDEO,
103 CODEC_ID_TRUEMOTION1,
130 CODEC_ID_TRUEMOTION2,
147 CODEC_ID_DSICINVIDEO,
148 CODEC_ID_TIERTEXSEQVIDEO,
157 CODEC_ID_BETHSOFTVID,
175 CODEC_ID_MOTIONPIXELS,
193 CODEC_ID_IFF_BYTERUN1,
208 /* various PCM "codecs" */
209 CODEC_ID_PCM_S16LE= 0x10000,
225 CODEC_ID_PCM_S24DAUD,
227 CODEC_ID_PCM_S16LE_PLANAR,
237 /* various ADPCM codecs */
238 CODEC_ID_ADPCM_IMA_QT= 0x11000,
239 CODEC_ID_ADPCM_IMA_WAV,
240 CODEC_ID_ADPCM_IMA_DK3,
241 CODEC_ID_ADPCM_IMA_DK4,
242 CODEC_ID_ADPCM_IMA_WS,
243 CODEC_ID_ADPCM_IMA_SMJPEG,
252 CODEC_ID_ADPCM_YAMAHA,
253 CODEC_ID_ADPCM_SBPRO_4,
254 CODEC_ID_ADPCM_SBPRO_3,
255 CODEC_ID_ADPCM_SBPRO_2,
257 CODEC_ID_ADPCM_IMA_AMV,
258 CODEC_ID_ADPCM_EA_R1,
259 CODEC_ID_ADPCM_EA_R3,
260 CODEC_ID_ADPCM_EA_R2,
261 CODEC_ID_ADPCM_IMA_EA_SEAD,
262 CODEC_ID_ADPCM_IMA_EA_EACS,
263 CODEC_ID_ADPCM_EA_XAS,
264 CODEC_ID_ADPCM_EA_MAXIS_XA,
265 CODEC_ID_ADPCM_IMA_ISS,
269 CODEC_ID_AMR_NB= 0x12000,
272 /* RealAudio codecs*/
273 CODEC_ID_RA_144= 0x13000,
276 /* various DPCM codecs */
277 CODEC_ID_ROQ_DPCM= 0x14000,
278 CODEC_ID_INTERPLAY_DPCM,
283 CODEC_ID_MP2= 0x15000,
284 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
302 CODEC_ID_WESTWOOD_SND1,
303 CODEC_ID_GSM, ///< as in Berlin toast format
311 CODEC_ID_DSICINAUDIO,
315 CODEC_ID_GSM_MS, /* as found in WAV */
324 CODEC_ID_WMALOSSLESS,
333 CODEC_ID_BINKAUDIO_RDFT,
334 CODEC_ID_BINKAUDIO_DCT,
339 /* subtitle codecs */
340 CODEC_ID_DVD_SUBTITLE= 0x17000,
341 CODEC_ID_DVB_SUBTITLE,
342 CODEC_ID_TEXT, ///< raw UTF-8 text
346 CODEC_ID_HDMV_PGS_SUBTITLE,
347 CODEC_ID_DVB_TELETEXT,
351 /* other specific kind of codecs (generally used for attachments) */
352 CODEC_ID_TTF= 0x18000,
354 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
356 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
357 * stream (only used by libavformat) */
358 CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
361 #if FF_API_OLD_SAMPLE_FMT
362 #define SampleFormat AVSampleFormat
364 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
365 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
366 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
367 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
368 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
369 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
370 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
373 #if FF_API_OLD_AUDIOCONVERT
374 #include "libavutil/audioconvert.h"
376 /* Audio channel masks */
377 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
378 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
379 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
380 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
381 #define CH_BACK_LEFT AV_CH_BACK_LEFT
382 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
383 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
384 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
385 #define CH_BACK_CENTER AV_CH_BACK_CENTER
386 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
387 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
388 #define CH_TOP_CENTER AV_CH_TOP_CENTER
389 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
390 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
391 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
392 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
393 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
394 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
395 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
396 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
398 /** Channel mask value used for AVCodecContext.request_channel_layout
399 to indicate that the user requests the channel order of the decoder output
400 to be the native codec channel order. */
401 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
403 /* Audio channel convenience macros */
404 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
405 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
406 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
407 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
408 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
409 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
410 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
411 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
412 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
413 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
414 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
415 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
416 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
417 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
418 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
422 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
425 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
426 * This is mainly needed because some optimized bitstream readers read
427 * 32 or 64 bit at once and could read over the end.<br>
428 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
429 * MPEG bitstreams could cause overread and segfault.
431 #define FF_INPUT_BUFFER_PADDING_SIZE 8
434 * minimum encoding buffer size
435 * Used to avoid some checks during header writing.
437 #define FF_MIN_BUFFER_SIZE 16384
441 * motion estimation type.
444 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
448 ME_EPZS, ///< enhanced predictive zonal search
449 ME_X1, ///< reserved for experiments
450 ME_HEX, ///< hexagon based search
451 ME_UMH, ///< uneven multi-hexagon search
452 ME_ITER, ///< iterative search
453 ME_TESA, ///< transformed exhaustive search algorithm
457 /* We leave some space between them for extensions (drop some
458 * keyframes for intra-only or drop just some bidir frames). */
459 AVDISCARD_NONE =-16, ///< discard nothing
460 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
461 AVDISCARD_NONREF = 8, ///< discard all non reference
462 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
463 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
464 AVDISCARD_ALL = 48, ///< discard all
467 enum AVColorPrimaries{
468 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
469 AVCOL_PRI_UNSPECIFIED=2,
471 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
472 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
473 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
475 AVCOL_PRI_NB , ///< Not part of ABI
478 enum AVColorTransferCharacteristic{
479 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
480 AVCOL_TRC_UNSPECIFIED=2,
481 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
482 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
483 AVCOL_TRC_NB , ///< Not part of ABI
488 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
489 AVCOL_SPC_UNSPECIFIED=2,
491 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
492 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
493 AVCOL_SPC_SMPTE240M =7,
494 AVCOL_SPC_NB , ///< Not part of ABI
498 AVCOL_RANGE_UNSPECIFIED=0,
499 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
500 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
501 AVCOL_RANGE_NB , ///< Not part of ABI
505 * X X 3 4 X X are luma samples,
506 * 1 2 1-6 are possible chroma positions
507 * X X 5 6 X 0 is undefined/unknown position
509 enum AVChromaLocation{
510 AVCHROMA_LOC_UNSPECIFIED=0,
511 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
512 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
513 AVCHROMA_LOC_TOPLEFT =3, ///< DV
515 AVCHROMA_LOC_BOTTOMLEFT =5,
516 AVCHROMA_LOC_BOTTOM =6,
517 AVCHROMA_LOC_NB , ///< Not part of ABI
520 #if FF_API_FLAC_GLOBAL_OPTS
524 attribute_deprecated enum AVLPCType {
525 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
526 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
527 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
528 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
529 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
530 AV_LPC_TYPE_NB , ///< Not part of ABI
534 enum AVAudioServiceType {
535 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
536 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
537 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
538 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
539 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
540 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
541 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
542 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
543 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
544 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
547 typedef struct RcOverride{
550 int qscale; // If this is 0 then quality_factor will be used instead.
551 float quality_factor;
554 #define FF_MAX_B_FRAMES 16
557 These flags can be passed in AVCodecContext.flags before initialization.
558 Note: Not everything is supported yet.
561 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
562 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
563 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
564 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
565 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
566 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
568 * The parent program guarantees that the input for B-frames containing
569 * streams is not written to for at least s->max_b_frames+1 frames, if
570 * this is not set the input will be copied.
572 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
573 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
574 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
575 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
576 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
577 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
578 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
579 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
580 location instead of only at frame boundaries. */
581 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
582 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
583 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
584 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
585 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
586 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
587 /* Fx : Flag for h263+ extra options */
588 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
589 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
590 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
591 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
592 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
593 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
594 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
595 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
596 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
597 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
598 #define CODEC_FLAG_CLOSED_GOP 0x80000000
599 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
600 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
601 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
602 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
603 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
604 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
605 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
606 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
607 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
608 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
609 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
610 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
611 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
612 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
613 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
614 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
615 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
616 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
617 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
618 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
619 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
620 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
622 /* Unsupported options :
623 * Syntax Arithmetic coding (SAC)
624 * Reference Picture Selection
625 * Independent Segment Decoding */
627 /* codec capabilities */
629 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
631 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
632 * If not set, it might not use get_buffer() at all or use operations that
633 * assume the buffer was allocated by avcodec_default_get_buffer.
635 #define CODEC_CAP_DR1 0x0002
636 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
637 #define CODEC_CAP_PARSE_ONLY 0x0004
638 #define CODEC_CAP_TRUNCATED 0x0008
639 /* Codec can export data for HW decoding (XvMC). */
640 #define CODEC_CAP_HWACCEL 0x0010
642 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
643 * If this is not set, the codec is guaranteed to never be fed with NULL data.
645 #define CODEC_CAP_DELAY 0x0020
647 * Codec can be fed a final frame with a smaller size.
648 * This can be used to prevent truncation of the last audio samples.
650 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
652 * Codec can export data for HW decoding (VDPAU).
654 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
656 * Codec can output multiple frames per AVPacket
657 * Normally demuxers return one frame at a time, demuxers which do not do
658 * are connected to a parser to split what they return into proper frames.
659 * This flag is reserved to the very rare category of codecs which have a
660 * bitstream that cannot be split into frames without timeconsuming
661 * operations like full decoding. Demuxers carring such bitstreams thus
662 * may return multiple frames in a packet. This has many disadvantages like
663 * prohibiting stream copy in many cases thus it should only be considered
666 #define CODEC_CAP_SUBFRAMES 0x0100
668 * Codec is experimental and is thus avoided in favor of non experimental
671 #define CODEC_CAP_EXPERIMENTAL 0x0200
673 * Codec should fill in channel configuration and samplerate instead of container
675 #define CODEC_CAP_CHANNEL_CONF 0x0400
678 * Codec is able to deal with negative linesizes
680 #define CODEC_CAP_NEG_LINESIZES 0x0800
683 * Codec supports frame-level multithreading.
685 #define CODEC_CAP_FRAME_THREADS 0x1000
687 * Codec supports slice-based (or partition-based) multithreading.
689 #define CODEC_CAP_SLICE_THREADS 0x2000
691 //The following defines may change, don't expect compatibility if you use them.
692 #define MB_TYPE_INTRA4x4 0x0001
693 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
694 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
695 #define MB_TYPE_16x16 0x0008
696 #define MB_TYPE_16x8 0x0010
697 #define MB_TYPE_8x16 0x0020
698 #define MB_TYPE_8x8 0x0040
699 #define MB_TYPE_INTERLACED 0x0080
700 #define MB_TYPE_DIRECT2 0x0100 //FIXME
701 #define MB_TYPE_ACPRED 0x0200
702 #define MB_TYPE_GMC 0x0400
703 #define MB_TYPE_SKIP 0x0800
704 #define MB_TYPE_P0L0 0x1000
705 #define MB_TYPE_P1L0 0x2000
706 #define MB_TYPE_P0L1 0x4000
707 #define MB_TYPE_P1L1 0x8000
708 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
709 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
710 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
711 #define MB_TYPE_QUANT 0x00010000
712 #define MB_TYPE_CBP 0x00020000
713 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
717 * This specifies the area which should be displayed.
718 * Note there may be multiple such areas for one frame.
720 typedef struct AVPanScan{
723 * - encoding: Set by user.
724 * - decoding: Set by libavcodec.
729 * width and height in 1/16 pel
730 * - encoding: Set by user.
731 * - decoding: Set by libavcodec.
737 * position of the top left corner in 1/16 pel for up to 3 fields/frames
738 * - encoding: Set by user.
739 * - decoding: Set by libavcodec.
741 int16_t position[3][2];
744 #define FF_COMMON_FRAME \
746 * pointer to the picture planes.\
747 * This might be different from the first allocated byte\
754 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
755 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
761 * 1 -> keyframe, 0-> not\
762 * - encoding: Set by libavcodec.\
763 * - decoding: Set by libavcodec.\
768 * Picture type of the frame, see ?_TYPE below.\
769 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
770 * - decoding: Set by libavcodec.\
772 enum AVPictureType pict_type;\
775 * presentation timestamp in time_base units (time when frame should be shown to user)\
776 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
777 * - encoding: MUST be set by user.\
778 * - decoding: Set by libavcodec.\
783 * picture number in bitstream order\
784 * - encoding: set by\
785 * - decoding: Set by libavcodec.\
787 int coded_picture_number;\
789 * picture number in display order\
790 * - encoding: set by\
791 * - decoding: Set by libavcodec.\
793 int display_picture_number;\
796 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
797 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
798 * - decoding: Set by libavcodec.\
803 * buffer age (1->was last buffer and dint change, 2->..., ...).\
804 * Set to INT_MAX if the buffer has not been used yet.\
805 * - encoding: unused\
806 * - decoding: MUST be set by get_buffer().\
811 * is this picture used as reference\
812 * The values for this are the same as the MpegEncContext.picture_structure\
813 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
814 * Set to 4 for delayed, non-reference frames.\
815 * - encoding: unused\
816 * - decoding: Set by libavcodec. (before get_buffer() call)).\
822 * - encoding: unused\
823 * - decoding: Set by libavcodec.\
825 int8_t *qscale_table;\
828 * - encoding: unused\
829 * - decoding: Set by libavcodec.\
834 * mbskip_table[mb]>=1 if MB didn't change\
835 * stride= mb_width = (width+15)>>4\
836 * - encoding: unused\
837 * - decoding: Set by libavcodec.\
839 uint8_t *mbskip_table;\
842 * motion vector table\
845 * int mv_sample_log2= 4 - motion_subsample_log2;\
846 * int mb_width= (width+15)>>4;\
847 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
848 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
850 * - encoding: Set by user.\
851 * - decoding: Set by libavcodec.\
853 int16_t (*motion_val[2])[2];\
856 * macroblock type table\
857 * mb_type_base + mb_width + 2\
858 * - encoding: Set by user.\
859 * - decoding: Set by libavcodec.\
864 * log2 of the size of the block which a single vector in motion_val represents: \
865 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
866 * - encoding: unused\
867 * - decoding: Set by libavcodec.\
869 uint8_t motion_subsample_log2;\
872 * for some private data of the user\
873 * - encoding: unused\
874 * - decoding: Set by user.\
880 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
881 * - decoding: unused\
886 * type of the buffer (to keep track of who has to deallocate data[*])\
887 * - encoding: Set by the one who allocates it.\
888 * - decoding: Set by the one who allocates it.\
889 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
894 * When decoding, this signals how much the picture must be delayed.\
895 * extra_delay = repeat_pict / (2*fps)\
896 * - encoding: unused\
897 * - decoding: Set by libavcodec.\
907 * The content of the picture is interlaced.\
908 * - encoding: Set by user.\
909 * - decoding: Set by libavcodec. (default 0)\
911 int interlaced_frame;\
914 * If the content is interlaced, is top field displayed first.\
915 * - encoding: Set by user.\
916 * - decoding: Set by libavcodec.\
918 int top_field_first;\
922 * - encoding: Set by user.\
923 * - decoding: Set by libavcodec.\
925 AVPanScan *pan_scan;\
928 * Tell user application that palette has changed from previous frame.\
929 * - encoding: ??? (no palette-enabled encoder yet)\
930 * - decoding: Set by libavcodec. (default 0).\
932 int palette_has_changed;\
935 * codec suggestion on buffer type if != 0\
936 * - encoding: unused\
937 * - decoding: Set by libavcodec. (before get_buffer() call)).\
943 * - encoding: unused\
944 * - decoding: Set by libavcodec.\
949 * motion reference frame index\
950 * the order in which these are stored can depend on the codec.\
951 * - encoding: Set by user.\
952 * - decoding: Set by libavcodec.\
954 int8_t *ref_index[2];\
957 * reordered opaque 64bit (generally an integer or a double precision float\
958 * PTS but can be anything). \
959 * The user sets AVCodecContext.reordered_opaque to represent the input at\
961 * the decoder reorders values as needed and sets AVFrame.reordered_opaque\
962 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque \
963 * @deprecated in favor of pkt_pts\
964 * - encoding: unused\
965 * - decoding: Read by user.\
967 int64_t reordered_opaque;\
970 * hardware accelerator private data (FFmpeg allocated)\
971 * - encoding: unused\
972 * - decoding: Set by libavcodec\
974 void *hwaccel_picture_private;\
977 * reordered pts from the last AVPacket that has been input into the decoder\
978 * - encoding: unused\
979 * - decoding: Read by user.\
984 * dts from the last AVPacket that has been input into the decoder\
985 * - encoding: unused\
986 * - decoding: Read by user.\
991 * the AVCodecContext which ff_thread_get_buffer() was last called on\
992 * - encoding: Set by libavcodec.\
993 * - decoding: Set by libavcodec.\
995 struct AVCodecContext *owner;\
998 * used by multithreading to store frame-specific info\
999 * - encoding: Set by libavcodec.\
1000 * - decoding: Set by libavcodec.\
1002 void *thread_opaque;\
1005 * frame timestamp estimated using various heuristics, in stream time base\
1006 * - encoding: unused\
1007 * - decoding: set by libavcodec, read by user.\
1009 int64_t best_effort_timestamp;\
1012 * reordered pos from the last AVPacket that has been input into the decoder\
1013 * - encoding: unused\
1014 * - decoding: Read by user.\
1019 * reordered sample aspect ratio for the video frame, 0/1 if unknown\unspecified
1020 * - encoding: unused\
1021 * - decoding: Read by user.\
1023 AVRational sample_aspect_ratio;\
1026 * width and height of the video frame\
1027 * - encoding: unused\
1028 * - decoding: Read by user.\
1033 * format of the frame, -1 if unknown or unset\
1034 * It should be cast to the corresponding enum (enum PixelFormat\
1035 * for video, enum AVSampleFormat for audio)\
1036 * - encoding: unused\
1037 * - decoding: Read by user.\
1042 #define FF_QSCALE_TYPE_MPEG1 0
1043 #define FF_QSCALE_TYPE_MPEG2 1
1044 #define FF_QSCALE_TYPE_H264 2
1045 #define FF_QSCALE_TYPE_VP56 3
1047 #define FF_BUFFER_TYPE_INTERNAL 1
1048 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1049 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1050 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1052 #if FF_API_OLD_FF_PICT_TYPES
1053 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
1054 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
1055 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
1056 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
1057 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
1058 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
1059 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
1060 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
1063 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1064 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1065 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1066 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1068 enum AVPacketSideDataType {
1069 AV_PKT_DATA_PALETTE,
1072 typedef struct AVPacket {
1074 * Presentation timestamp in AVStream->time_base units; the time at which
1075 * the decompressed packet will be presented to the user.
1076 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1077 * pts MUST be larger or equal to dts as presentation cannot happen before
1078 * decompression, unless one wants to view hex dumps. Some formats misuse
1079 * the terms dts and pts/cts to mean something different. Such timestamps
1080 * must be converted to true pts/dts before they are stored in AVPacket.
1084 * Decompression timestamp in AVStream->time_base units; the time at which
1085 * the packet is decompressed.
1086 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1094 * Additional packet data that can be provided by the container.
1095 * Packet can contain several types of side information.
1100 enum AVPacketSideDataType type;
1102 int side_data_elems;
1105 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1106 * Equals next_pts - this_pts in presentation order.
1109 void (*destruct)(struct AVPacket *);
1111 int64_t pos; ///< byte position in stream, -1 if unknown
1114 * Time difference in AVStream->time_base units from the pts of this
1115 * packet to the point at which the output from the decoder has converged
1116 * independent from the availability of previous frames. That is, the
1117 * frames are virtually identical no matter if decoding started from
1118 * the very first frame or from this keyframe.
1119 * Is AV_NOPTS_VALUE if unknown.
1120 * This field is not the display duration of the current packet.
1121 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1124 * The purpose of this field is to allow seeking in streams that have no
1125 * keyframes in the conventional sense. It corresponds to the
1126 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1127 * essential for some types of subtitle streams to ensure that all
1128 * subtitles are correctly displayed after seeking.
1130 int64_t convergence_duration;
1132 #define AV_PKT_FLAG_KEY 0x0001
1135 * Audio Video Frame.
1136 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1138 * Removal, reordering and changes to existing fields require a major
1139 * version bump. No fields should be added into AVFrame before or after
1141 * sizeof(AVFrame) must not be used outside libav*.
1143 typedef struct AVFrame {
1148 * main external API structure.
1149 * New fields can be added to the end with minor version bumps.
1150 * Removal, reordering and changes to existing fields require a major
1152 * sizeof(AVCodecContext) must not be used outside libav*.
1154 typedef struct AVCodecContext {
1156 * information on struct for av_log
1157 * - set by avcodec_alloc_context
1159 const AVClass *av_class;
1161 * the average bitrate
1162 * - encoding: Set by user; unused for constant quantizer encoding.
1163 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1168 * number of bits the bitstream is allowed to diverge from the reference.
1169 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1170 * - encoding: Set by user; unused for constant quantizer encoding.
1171 * - decoding: unused
1173 int bit_rate_tolerance;
1177 * - encoding: Set by user.
1178 * - decoding: Set by user.
1183 * Some codecs need additional format info. It is stored here.
1184 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1185 * specific codec MUST set it correctly otherwise stream copy breaks.
1186 * In general use of this field by muxers is not recommanded.
1187 * - encoding: Set by libavcodec.
1188 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1193 * Motion estimation algorithm used for video coding.
1194 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1195 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1196 * - encoding: MUST be set by user.
1197 * - decoding: unused
1202 * some codecs need / can use extradata like Huffman tables.
1203 * mjpeg: Huffman tables
1204 * rv10: additional flags
1205 * mpeg4: global headers (they can be in the bitstream or here)
1206 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1207 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1208 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1209 * - encoding: Set/allocated/freed by libavcodec.
1210 * - decoding: Set/allocated/freed by user.
1216 * This is the fundamental unit of time (in seconds) in terms
1217 * of which frame timestamps are represented. For fixed-fps content,
1218 * timebase should be 1/framerate and timestamp increments should be
1220 * - encoding: MUST be set by user.
1221 * - decoding: Set by libavcodec.
1223 AVRational time_base;
1227 * picture width / height.
1228 * - encoding: MUST be set by user.
1229 * - decoding: Set by libavcodec.
1230 * Note: For compatibility it is possible to set this instead of
1231 * coded_width/height before decoding.
1235 #define FF_ASPECT_EXTENDED 15
1238 * the number of pictures in a group of pictures, or 0 for intra_only
1239 * - encoding: Set by user.
1240 * - decoding: unused
1245 * Pixel format, see PIX_FMT_xxx.
1246 * May be set by the demuxer if known from headers.
1247 * May be overriden by the decoder if it knows better.
1248 * - encoding: Set by user.
1249 * - decoding: Set by user if known, overridden by libavcodec if known
1251 enum PixelFormat pix_fmt;
1254 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1255 * decoder to draw a horizontal band. It improves cache usage. Not
1256 * all codecs can do that. You must check the codec capabilities
1258 * When multithreading is used, it may be called from multiple threads
1259 * at the same time; threads might draw different parts of the same AVFrame,
1260 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1262 * The function is also used by hardware acceleration APIs.
1263 * It is called at least once during frame decoding to pass
1264 * the data needed for hardware render.
1265 * In that mode instead of pixel data, AVFrame points to
1266 * a structure specific to the acceleration API. The application
1267 * reads the structure and can change some fields to indicate progress
1269 * - encoding: unused
1270 * - decoding: Set by user.
1271 * @param height the height of the slice
1272 * @param y the y position of the slice
1273 * @param type 1->top field, 2->bottom field, 3->frame
1274 * @param offset offset into the AVFrame.data from which the slice should be read
1276 void (*draw_horiz_band)(struct AVCodecContext *s,
1277 const AVFrame *src, int offset[4],
1278 int y, int type, int height);
1281 int sample_rate; ///< samples per second
1282 int channels; ///< number of audio channels
1285 * audio sample format
1286 * - encoding: Set by user.
1287 * - decoding: Set by libavcodec.
1289 enum AVSampleFormat sample_fmt; ///< sample format
1291 /* The following data should not be initialized. */
1293 * Samples per packet, initialized when calling 'init'.
1296 int frame_number; ///< audio or video frame number
1299 * Number of frames the decoded output will be delayed relative to
1300 * the encoded input.
1301 * - encoding: Set by libavcodec.
1302 * - decoding: unused
1306 /* - encoding parameters */
1307 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1308 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1312 * - encoding: Set by user.
1313 * - decoding: unused
1319 * - encoding: Set by user.
1320 * - decoding: unused
1325 * maximum quantizer difference between frames
1326 * - encoding: Set by user.
1327 * - decoding: unused
1332 * maximum number of B-frames between non-B-frames
1333 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1334 * - encoding: Set by user.
1335 * - decoding: unused
1340 * qscale factor between IP and B-frames
1341 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1342 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1343 * - encoding: Set by user.
1344 * - decoding: unused
1346 float b_quant_factor;
1348 /** obsolete FIXME remove */
1350 #define FF_RC_STRATEGY_XVID 1
1352 int b_frame_strategy;
1354 struct AVCodec *codec;
1358 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1359 /* do its best to deliver a chunk with size */
1360 /* below rtp_payload_size, the chunk will start */
1361 /* with a start code on some codecs like H.263. */
1362 /* This doesn't take account of any particular */
1363 /* headers inside the transmitted RTP payload. */
1366 /* The RTP callback: This function is called */
1367 /* every time the encoder has a packet to send. */
1368 /* It depends on the encoder if the data starts */
1369 /* with a Start Code (it should). H.263 does. */
1370 /* mb_nb contains the number of macroblocks */
1371 /* encoded in the RTP payload. */
1372 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1374 /* statistics, used for 2-pass encoding */
1385 * number of bits used for the previously encoded frame
1386 * - encoding: Set by libavcodec.
1387 * - decoding: unused
1392 * Private data of the user, can be used to carry app specific stuff.
1393 * - encoding: Set by user.
1394 * - decoding: Set by user.
1398 char codec_name[32];
1399 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1400 enum CodecID codec_id; /* see CODEC_ID_xxx */
1403 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1404 * This is used to work around some encoder bugs.
1405 * A demuxer should set this to what is stored in the field used to identify the codec.
1406 * If there are multiple such fields in a container then the demuxer should choose the one
1407 * which maximizes the information about the used codec.
1408 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1409 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1410 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1412 * - encoding: Set by user, if not then the default based on codec_id will be used.
1413 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1415 unsigned int codec_tag;
1418 * Work around bugs in encoders which sometimes cannot be detected automatically.
1419 * - encoding: Set by user
1420 * - decoding: Set by user
1422 int workaround_bugs;
1423 #define FF_BUG_AUTODETECT 1 ///< autodetection
1424 #define FF_BUG_OLD_MSMPEG4 2
1425 #define FF_BUG_XVID_ILACE 4
1426 #define FF_BUG_UMP4 8
1427 #define FF_BUG_NO_PADDING 16
1428 #define FF_BUG_AMV 32
1429 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1430 #define FF_BUG_QPEL_CHROMA 64
1431 #define FF_BUG_STD_QPEL 128
1432 #define FF_BUG_QPEL_CHROMA2 256
1433 #define FF_BUG_DIRECT_BLOCKSIZE 512
1434 #define FF_BUG_EDGE 1024
1435 #define FF_BUG_HPEL_CHROMA 2048
1436 #define FF_BUG_DC_CLIP 4096
1437 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1438 #define FF_BUG_TRUNCATED 16384
1439 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1442 * luma single coefficient elimination threshold
1443 * - encoding: Set by user.
1444 * - decoding: unused
1446 int luma_elim_threshold;
1449 * chroma single coeff elimination threshold
1450 * - encoding: Set by user.
1451 * - decoding: unused
1453 int chroma_elim_threshold;
1456 * strictly follow the standard (MPEG4, ...).
1457 * - encoding: Set by user.
1458 * - decoding: Set by user.
1459 * Setting this to STRICT or higher means the encoder and decoder will
1460 * generally do stupid things, whereas setting it to unofficial or lower
1461 * will mean the encoder might produce output that is not supported by all
1462 * spec-compliant decoders. Decoders don't differentiate between normal,
1463 * unofficial and experimental (that is, they always try to decode things
1464 * when they can) unless they are explicitly asked to behave stupidly
1465 * (=strictly conform to the specs)
1467 int strict_std_compliance;
1468 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1469 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1470 #define FF_COMPLIANCE_NORMAL 0
1471 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1472 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1475 * qscale offset between IP and B-frames
1476 * - encoding: Set by user.
1477 * - decoding: unused
1479 float b_quant_offset;
1482 * Error recognization; higher values will detect more errors but may
1483 * misdetect some more or less valid parts as errors.
1484 * - encoding: unused
1485 * - decoding: Set by user.
1487 int error_recognition;
1488 #define FF_ER_CAREFUL 1
1489 #define FF_ER_COMPLIANT 2
1490 #define FF_ER_AGGRESSIVE 3
1491 #define FF_ER_VERY_AGGRESSIVE 4
1494 * Called at the beginning of each frame to get a buffer for it.
1495 * If pic.reference is set then the frame will be read later by libavcodec.
1496 * avcodec_align_dimensions2() should be used to find the required width and
1497 * height, as they normally need to be rounded up to the next multiple of 16.
1498 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1499 * avcodec_default_get_buffer() instead of providing buffers allocated by
1501 * If frame multithreading is used and thread_safe_callbacks is set,
1502 * it may be called from a different thread, but not from more than one at once.
1503 * Does not need to be reentrant.
1504 * - encoding: unused
1505 * - decoding: Set by libavcodec, user can override.
1507 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1510 * Called to release buffers which were allocated with get_buffer.
1511 * A released buffer can be reused in get_buffer().
1512 * pic.data[*] must be set to NULL.
1513 * May be called from a different thread if frame multithreading is used,
1514 * but not by more than one thread at once, so does not need to be reentrant.
1515 * - encoding: unused
1516 * - decoding: Set by libavcodec, user can override.
1518 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1521 * Size of the frame reordering buffer in the decoder.
1522 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1523 * - encoding: Set by libavcodec.
1524 * - decoding: Set by libavcodec.
1529 * number of bytes per packet if constant and known or 0
1530 * Used by some WAV based audio codecs.
1534 int parse_only; /* - decoding only: If true, only parsing is done
1535 (function avcodec_parse_frame()). The frame
1536 data is returned. Only MPEG codecs support this now. */
1539 * 0-> h263 quant 1-> mpeg quant
1540 * - encoding: Set by user.
1541 * - decoding: unused
1546 * pass1 encoding statistics output buffer
1547 * - encoding: Set by libavcodec.
1548 * - decoding: unused
1553 * pass2 encoding statistics input buffer
1554 * Concatenated stuff from stats_out of pass1 should be placed here.
1555 * - encoding: Allocated/set/freed by user.
1556 * - decoding: unused
1561 * ratecontrol qmin qmax limiting method
1562 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1563 * - encoding: Set by user.
1564 * - decoding: unused
1572 * ratecontrol override, see RcOverride
1573 * - encoding: Allocated/set/freed by user.
1574 * - decoding: unused
1576 RcOverride *rc_override;
1577 int rc_override_count;
1580 * rate control equation
1581 * - encoding: Set by user
1582 * - decoding: unused
1588 * - encoding: Set by user.
1589 * - decoding: unused
1595 * - encoding: Set by user.
1596 * - decoding: unused
1601 * decoder bitstream buffer size
1602 * - encoding: Set by user.
1603 * - decoding: unused
1606 float rc_buffer_aggressivity;
1609 * qscale factor between P and I-frames
1610 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1611 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1612 * - encoding: Set by user.
1613 * - decoding: unused
1615 float i_quant_factor;
1618 * qscale offset between P and I-frames
1619 * - encoding: Set by user.
1620 * - decoding: unused
1622 float i_quant_offset;
1625 * initial complexity for pass1 ratecontrol
1626 * - encoding: Set by user.
1627 * - decoding: unused
1629 float rc_initial_cplx;
1632 * DCT algorithm, see FF_DCT_* below
1633 * - encoding: Set by user.
1634 * - decoding: unused
1637 #define FF_DCT_AUTO 0
1638 #define FF_DCT_FASTINT 1
1639 #define FF_DCT_INT 2
1640 #define FF_DCT_MMX 3
1641 #define FF_DCT_MLIB 4
1642 #define FF_DCT_ALTIVEC 5
1643 #define FF_DCT_FAAN 6
1646 * luminance masking (0-> disabled)
1647 * - encoding: Set by user.
1648 * - decoding: unused
1653 * temporary complexity masking (0-> disabled)
1654 * - encoding: Set by user.
1655 * - decoding: unused
1657 float temporal_cplx_masking;
1660 * spatial complexity masking (0-> disabled)
1661 * - encoding: Set by user.
1662 * - decoding: unused
1664 float spatial_cplx_masking;
1667 * p block masking (0-> disabled)
1668 * - encoding: Set by user.
1669 * - decoding: unused
1674 * darkness masking (0-> disabled)
1675 * - encoding: Set by user.
1676 * - decoding: unused
1681 * IDCT algorithm, see FF_IDCT_* below.
1682 * - encoding: Set by user.
1683 * - decoding: Set by user.
1686 #define FF_IDCT_AUTO 0
1687 #define FF_IDCT_INT 1
1688 #define FF_IDCT_SIMPLE 2
1689 #define FF_IDCT_SIMPLEMMX 3
1690 #define FF_IDCT_LIBMPEG2MMX 4
1691 #define FF_IDCT_PS2 5
1692 #define FF_IDCT_MLIB 6
1693 #define FF_IDCT_ARM 7
1694 #define FF_IDCT_ALTIVEC 8
1695 #define FF_IDCT_SH4 9
1696 #define FF_IDCT_SIMPLEARM 10
1697 #define FF_IDCT_H264 11
1698 #define FF_IDCT_VP3 12
1699 #define FF_IDCT_IPP 13
1700 #define FF_IDCT_XVIDMMX 14
1701 #define FF_IDCT_CAVS 15
1702 #define FF_IDCT_SIMPLEARMV5TE 16
1703 #define FF_IDCT_SIMPLEARMV6 17
1704 #define FF_IDCT_SIMPLEVIS 18
1705 #define FF_IDCT_WMV2 19
1706 #define FF_IDCT_FAAN 20
1707 #define FF_IDCT_EA 21
1708 #define FF_IDCT_SIMPLENEON 22
1709 #define FF_IDCT_SIMPLEALPHA 23
1710 #define FF_IDCT_BINK 24
1714 * - encoding: Set by libavcodec.
1715 * - decoding: Set by user (or 0).
1719 * slice offsets in the frame in bytes
1720 * - encoding: Set/allocated by libavcodec.
1721 * - decoding: Set/allocated by user (or NULL).
1726 * error concealment flags
1727 * - encoding: unused
1728 * - decoding: Set by user.
1730 int error_concealment;
1731 #define FF_EC_GUESS_MVS 1
1732 #define FF_EC_DEBLOCK 2
1735 * dsp_mask could be add used to disable unwanted CPU features
1736 * CPU features (i.e. MMX, SSE. ...)
1738 * With the FORCE flag you may instead enable given CPU features.
1739 * (Dangerous: Usable in case of misdetection, improper usage however will
1740 * result into program crash.)
1745 * bits per sample/pixel from the demuxer (needed for huffyuv).
1746 * - encoding: Set by libavcodec.
1747 * - decoding: Set by user.
1749 int bits_per_coded_sample;
1752 * prediction method (needed for huffyuv)
1753 * - encoding: Set by user.
1754 * - decoding: unused
1756 int prediction_method;
1757 #define FF_PRED_LEFT 0
1758 #define FF_PRED_PLANE 1
1759 #define FF_PRED_MEDIAN 2
1762 * sample aspect ratio (0 if unknown)
1763 * That is the width of a pixel divided by the height of the pixel.
1764 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1765 * - encoding: Set by user.
1766 * - decoding: Set by libavcodec.
1768 AVRational sample_aspect_ratio;
1771 * the picture in the bitstream
1772 * - encoding: Set by libavcodec.
1773 * - decoding: Set by libavcodec.
1775 AVFrame *coded_frame;
1779 * - encoding: Set by user.
1780 * - decoding: Set by user.
1783 #define FF_DEBUG_PICT_INFO 1
1784 #define FF_DEBUG_RC 2
1785 #define FF_DEBUG_BITSTREAM 4
1786 #define FF_DEBUG_MB_TYPE 8
1787 #define FF_DEBUG_QP 16
1788 #define FF_DEBUG_MV 32
1789 #define FF_DEBUG_DCT_COEFF 0x00000040
1790 #define FF_DEBUG_SKIP 0x00000080
1791 #define FF_DEBUG_STARTCODE 0x00000100
1792 #define FF_DEBUG_PTS 0x00000200
1793 #define FF_DEBUG_ER 0x00000400
1794 #define FF_DEBUG_MMCO 0x00000800
1795 #define FF_DEBUG_BUGS 0x00001000
1796 #define FF_DEBUG_VIS_QP 0x00002000
1797 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1798 #define FF_DEBUG_BUFFERS 0x00008000
1799 #define FF_DEBUG_THREADS 0x00010000
1803 * - encoding: Set by user.
1804 * - decoding: Set by user.
1807 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1808 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1809 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1813 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1814 * - decoding: unused
1819 * motion estimation comparison function
1820 * - encoding: Set by user.
1821 * - decoding: unused
1825 * subpixel motion estimation comparison function
1826 * - encoding: Set by user.
1827 * - decoding: unused
1831 * macroblock comparison function (not supported yet)
1832 * - encoding: Set by user.
1833 * - decoding: unused
1837 * interlaced DCT comparison function
1838 * - encoding: Set by user.
1839 * - decoding: unused
1842 #define FF_CMP_SAD 0
1843 #define FF_CMP_SSE 1
1844 #define FF_CMP_SATD 2
1845 #define FF_CMP_DCT 3
1846 #define FF_CMP_PSNR 4
1847 #define FF_CMP_BIT 5
1849 #define FF_CMP_ZERO 7
1850 #define FF_CMP_VSAD 8
1851 #define FF_CMP_VSSE 9
1852 #define FF_CMP_NSSE 10
1853 #define FF_CMP_W53 11
1854 #define FF_CMP_W97 12
1855 #define FF_CMP_DCTMAX 13
1856 #define FF_CMP_DCT264 14
1857 #define FF_CMP_CHROMA 256
1860 * ME diamond size & shape
1861 * - encoding: Set by user.
1862 * - decoding: unused
1867 * amount of previous MV predictors (2a+1 x 2a+1 square)
1868 * - encoding: Set by user.
1869 * - decoding: unused
1871 int last_predictor_count;
1874 * prepass for motion estimation
1875 * - encoding: Set by user.
1876 * - decoding: unused
1881 * motion estimation prepass comparison function
1882 * - encoding: Set by user.
1883 * - decoding: unused
1888 * ME prepass diamond size & shape
1889 * - encoding: Set by user.
1890 * - decoding: unused
1896 * - encoding: Set by user.
1897 * - decoding: unused
1899 int me_subpel_quality;
1902 * callback to negotiate the pixelFormat
1903 * @param fmt is the list of formats which are supported by the codec,
1904 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1905 * The first is always the native one.
1906 * @return the chosen format
1907 * - encoding: unused
1908 * - decoding: Set by user, if not set the native format will be chosen.
1910 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1913 * DTG active format information (additional aspect ratio
1914 * information only used in DVB MPEG-2 transport streams)
1917 * - encoding: unused
1918 * - decoding: Set by decoder.
1920 int dtg_active_format;
1921 #define FF_DTG_AFD_SAME 8
1922 #define FF_DTG_AFD_4_3 9
1923 #define FF_DTG_AFD_16_9 10
1924 #define FF_DTG_AFD_14_9 11
1925 #define FF_DTG_AFD_4_3_SP_14_9 13
1926 #define FF_DTG_AFD_16_9_SP_14_9 14
1927 #define FF_DTG_AFD_SP_4_3 15
1930 * maximum motion estimation search range in subpel units
1931 * If 0 then no limit.
1933 * - encoding: Set by user.
1934 * - decoding: unused
1939 * intra quantizer bias
1940 * - encoding: Set by user.
1941 * - decoding: unused
1943 int intra_quant_bias;
1944 #define FF_DEFAULT_QUANT_BIAS 999999
1947 * inter quantizer bias
1948 * - encoding: Set by user.
1949 * - decoding: unused
1951 int inter_quant_bias;
1955 * - encoding: unused
1956 * - decoding: Which clrtable should be used for 8bit RGB images.
1957 * Tables have to be stored somewhere. FIXME
1962 * internal_buffer count
1963 * Don't touch, used by libavcodec default_get_buffer().
1965 int internal_buffer_count;
1969 * Don't touch, used by libavcodec default_get_buffer().
1971 void *internal_buffer;
1974 * Global quality for codecs which cannot change it per frame.
1975 * This should be proportional to MPEG-1/2/4 qscale.
1976 * - encoding: Set by user.
1977 * - decoding: unused
1981 #define FF_CODER_TYPE_VLC 0
1982 #define FF_CODER_TYPE_AC 1
1983 #define FF_CODER_TYPE_RAW 2
1984 #define FF_CODER_TYPE_RLE 3
1985 #define FF_CODER_TYPE_DEFLATE 4
1988 * - encoding: Set by user.
1989 * - decoding: unused
1995 * - encoding: Set by user.
1996 * - decoding: unused
2002 * - encoding: unused
2003 * - decoding: Set by user.
2005 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2010 * - encoding: unused
2011 * - decoding: Set by user.
2014 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2015 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2016 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2019 * XVideo Motion Acceleration
2020 * - encoding: forbidden
2021 * - decoding: set by decoder
2023 int xvmc_acceleration;
2026 * macroblock decision mode
2027 * - encoding: Set by user.
2028 * - decoding: unused
2031 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2032 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2033 #define FF_MB_DECISION_RD 2 ///< rate distortion
2036 * custom intra quantization matrix
2037 * - encoding: Set by user, can be NULL.
2038 * - decoding: Set by libavcodec.
2040 uint16_t *intra_matrix;
2043 * custom inter quantization matrix
2044 * - encoding: Set by user, can be NULL.
2045 * - decoding: Set by libavcodec.
2047 uint16_t *inter_matrix;
2050 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2051 * This is used to work around some encoder bugs.
2052 * - encoding: unused
2053 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2055 unsigned int stream_codec_tag;
2058 * scene change detection threshold
2059 * 0 is default, larger means fewer detected scene changes.
2060 * - encoding: Set by user.
2061 * - decoding: unused
2063 int scenechange_threshold;
2066 * minimum Lagrange multipler
2067 * - encoding: Set by user.
2068 * - decoding: unused
2073 * maximum Lagrange multipler
2074 * - encoding: Set by user.
2075 * - decoding: unused
2079 #if FF_API_PALETTE_CONTROL
2081 * palette control structure
2082 * - encoding: ??? (no palette-enabled encoder yet)
2083 * - decoding: Set by user.
2085 struct AVPaletteControl *palctrl;
2089 * noise reduction strength
2090 * - encoding: Set by user.
2091 * - decoding: unused
2093 int noise_reduction;
2096 * Called at the beginning of a frame to get cr buffer for it.
2097 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2098 * libavcodec will pass previous buffer in pic, function should return
2099 * same buffer or new buffer with old frame "painted" into it.
2100 * If pic.data[0] == NULL must behave like get_buffer().
2101 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2102 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2104 * - encoding: unused
2105 * - decoding: Set by libavcodec, user can override.
2107 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2110 * Number of bits which should be loaded into the rc buffer before decoding starts.
2111 * - encoding: Set by user.
2112 * - decoding: unused
2114 int rc_initial_buffer_occupancy;
2118 * - encoding: Set by user.
2119 * - decoding: unused
2121 int inter_threshold;
2125 * - encoding: Set by user.
2126 * - decoding: Set by user.
2131 * Simulates errors in the bitstream to test error concealment.
2132 * - encoding: Set by user.
2133 * - decoding: unused
2137 #if FF_API_ANTIALIAS_ALGO
2139 * MP3 antialias algorithm, see FF_AA_* below.
2140 * - encoding: unused
2141 * - decoding: Set by user.
2143 attribute_deprecated int antialias_algo;
2144 #define FF_AA_AUTO 0
2145 #define FF_AA_FASTINT 1 //not implemented yet
2147 #define FF_AA_FLOAT 3
2151 * quantizer noise shaping
2152 * - encoding: Set by user.
2153 * - decoding: unused
2155 int quantizer_noise_shaping;
2159 * is used to decide how many independent tasks should be passed to execute()
2160 * - encoding: Set by user.
2161 * - decoding: Set by user.
2166 * The codec may call this to execute several independent things.
2167 * It will return only after finishing all tasks.
2168 * The user may replace this with some multithreaded implementation,
2169 * the default implementation will execute the parts serially.
2170 * @param count the number of things to execute
2171 * - encoding: Set by libavcodec, user can override.
2172 * - decoding: Set by libavcodec, user can override.
2174 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2178 * Can be used by execute() to store some per AVCodecContext stuff.
2179 * - encoding: set by execute()
2180 * - decoding: set by execute()
2182 void *thread_opaque;
2185 * Motion estimation threshold below which no motion estimation is
2186 * performed, but instead the user specified motion vectors are used.
2188 * - encoding: Set by user.
2189 * - decoding: unused
2194 * Macroblock threshold below which the user specified macroblock types will be used.
2195 * - encoding: Set by user.
2196 * - decoding: unused
2201 * precision of the intra DC coefficient - 8
2202 * - encoding: Set by user.
2203 * - decoding: unused
2205 int intra_dc_precision;
2208 * noise vs. sse weight for the nsse comparsion function
2209 * - encoding: Set by user.
2210 * - decoding: unused
2215 * Number of macroblock rows at the top which are skipped.
2216 * - encoding: unused
2217 * - decoding: Set by user.
2222 * Number of macroblock rows at the bottom which are skipped.
2223 * - encoding: unused
2224 * - decoding: Set by user.
2230 * - encoding: Set by user.
2231 * - decoding: Set by libavcodec.
2234 #define FF_PROFILE_UNKNOWN -99
2235 #define FF_PROFILE_RESERVED -100
2237 #define FF_PROFILE_AAC_MAIN 0
2238 #define FF_PROFILE_AAC_LOW 1
2239 #define FF_PROFILE_AAC_SSR 2
2240 #define FF_PROFILE_AAC_LTP 3
2242 #define FF_PROFILE_DTS 20
2243 #define FF_PROFILE_DTS_ES 30
2244 #define FF_PROFILE_DTS_96_24 40
2245 #define FF_PROFILE_DTS_HD_HRA 50
2246 #define FF_PROFILE_DTS_HD_MA 60
2248 #define FF_PROFILE_MPEG2_422 0
2249 #define FF_PROFILE_MPEG2_HIGH 1
2250 #define FF_PROFILE_MPEG2_SS 2
2251 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2252 #define FF_PROFILE_MPEG2_MAIN 4
2253 #define FF_PROFILE_MPEG2_SIMPLE 5
2255 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2256 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2258 #define FF_PROFILE_H264_BASELINE 66
2259 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2260 #define FF_PROFILE_H264_MAIN 77
2261 #define FF_PROFILE_H264_EXTENDED 88
2262 #define FF_PROFILE_H264_HIGH 100
2263 #define FF_PROFILE_H264_HIGH_10 110
2264 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2265 #define FF_PROFILE_H264_HIGH_422 122
2266 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2267 #define FF_PROFILE_H264_HIGH_444 144
2268 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2269 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2270 #define FF_PROFILE_H264_CAVLC_444 44
2272 #define FF_PROFILE_VC1_SIMPLE 0
2273 #define FF_PROFILE_VC1_MAIN 1
2274 #define FF_PROFILE_VC1_COMPLEX 2
2275 #define FF_PROFILE_VC1_ADVANCED 3
2279 * - encoding: Set by user.
2280 * - decoding: Set by libavcodec.
2283 #define FF_LEVEL_UNKNOWN -99
2286 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2287 * - encoding: unused
2288 * - decoding: Set by user.
2293 * Bitstream width / height, may be different from width/height if lowres
2294 * or other things are used.
2295 * - encoding: unused
2296 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2298 int coded_width, coded_height;
2301 * frame skip threshold
2302 * - encoding: Set by user.
2303 * - decoding: unused
2305 int frame_skip_threshold;
2309 * - encoding: Set by user.
2310 * - decoding: unused
2312 int frame_skip_factor;
2315 * frame skip exponent
2316 * - encoding: Set by user.
2317 * - decoding: unused
2322 * frame skip comparison function
2323 * - encoding: Set by user.
2324 * - decoding: unused
2329 * Border processing masking, raises the quantizer for mbs on the borders
2331 * - encoding: Set by user.
2332 * - decoding: unused
2334 float border_masking;
2337 * minimum MB lagrange multipler
2338 * - encoding: Set by user.
2339 * - decoding: unused
2344 * maximum MB lagrange multipler
2345 * - encoding: Set by user.
2346 * - decoding: unused
2352 * - encoding: Set by user.
2353 * - decoding: unused
2355 int me_penalty_compensation;
2359 * - encoding: unused
2360 * - decoding: Set by user.
2362 enum AVDiscard skip_loop_filter;
2366 * - encoding: unused
2367 * - decoding: Set by user.
2369 enum AVDiscard skip_idct;
2373 * - encoding: unused
2374 * - decoding: Set by user.
2376 enum AVDiscard skip_frame;
2380 * - encoding: Set by user.
2381 * - decoding: unused
2387 * - encoding: Set by user.
2388 * - decoding: unused
2393 * constant rate factor - quality-based VBR - values ~correspond to qps
2394 * - encoding: Set by user.
2395 * - decoding: unused
2400 * constant quantization parameter rate control method
2401 * - encoding: Set by user.
2402 * - decoding: unused
2408 * - encoding: Set by user.
2409 * - decoding: unused
2414 * number of reference frames
2415 * - encoding: Set by user.
2416 * - decoding: Set by lavc.
2421 * chroma qp offset from luma
2422 * - encoding: Set by user.
2423 * - decoding: unused
2428 * Influences how often B-frames are used.
2429 * - encoding: Set by user.
2430 * - decoding: unused
2435 * trellis RD quantization
2436 * - encoding: Set by user.
2437 * - decoding: unused
2442 * Reduce fluctuations in qp (before curve compression).
2443 * - encoding: Set by user.
2444 * - decoding: unused
2446 float complexityblur;
2449 * in-loop deblocking filter alphac0 parameter
2450 * alpha is in the range -6...6
2451 * - encoding: Set by user.
2452 * - decoding: unused
2457 * in-loop deblocking filter beta parameter
2458 * beta is in the range -6...6
2459 * - encoding: Set by user.
2460 * - decoding: unused
2465 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2466 * - encoding: Set by user.
2467 * - decoding: unused
2470 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2471 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2472 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2473 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2474 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2477 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2478 * - encoding: Set by user.
2479 * - decoding: unused
2484 * Audio cutoff bandwidth (0 means "automatic")
2485 * - encoding: Set by user.
2486 * - decoding: unused
2491 * Multiplied by qscale for each frame and added to scene_change_score.
2492 * - encoding: Set by user.
2493 * - decoding: unused
2495 int scenechange_factor;
2499 * Note: Value depends upon the compare function used for fullpel ME.
2500 * - encoding: Set by user.
2501 * - decoding: unused
2506 * Adjusts sensitivity of b_frame_strategy 1.
2507 * - encoding: Set by user.
2508 * - decoding: unused
2513 * - encoding: Set by user.
2514 * - decoding: unused
2516 int compression_level;
2517 #define FF_COMPRESSION_DEFAULT -1
2520 * - encoding: Set by user.
2521 * - decoding: unused
2523 int min_prediction_order;
2526 * - encoding: Set by user.
2527 * - decoding: unused
2529 int max_prediction_order;
2531 #if FF_API_FLAC_GLOBAL_OPTS
2533 * @defgroup flac_opts FLAC options
2534 * @deprecated Use FLAC encoder private options instead.
2539 * LPC coefficient precision - used by FLAC encoder
2540 * - encoding: Set by user.
2541 * - decoding: unused
2543 attribute_deprecated int lpc_coeff_precision;
2546 * search method for selecting prediction order
2547 * - encoding: Set by user.
2548 * - decoding: unused
2550 attribute_deprecated int prediction_order_method;
2553 * - encoding: Set by user.
2554 * - decoding: unused
2556 attribute_deprecated int min_partition_order;
2559 * - encoding: Set by user.
2560 * - decoding: unused
2562 attribute_deprecated int max_partition_order;
2569 * GOP timecode frame start number, in non drop frame format
2570 * - encoding: Set by user.
2571 * - decoding: unused
2573 int64_t timecode_frame_start;
2575 #if FF_API_REQUEST_CHANNELS
2577 * Decoder should decode to this many channels if it can (0 for default)
2578 * - encoding: unused
2579 * - decoding: Set by user.
2580 * @deprecated Deprecated in favor of request_channel_layout.
2582 int request_channels;
2586 * Percentage of dynamic range compression to be applied by the decoder.
2587 * The default value is 1.0, corresponding to full compression.
2588 * - encoding: unused
2589 * - decoding: Set by user.
2594 * opaque 64bit number (generally a PTS) that will be reordered and
2595 * output in AVFrame.reordered_opaque
2596 * @deprecated in favor of pkt_pts
2597 * - encoding: unused
2598 * - decoding: Set by user.
2600 int64_t reordered_opaque;
2603 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2604 * This field is applicable only when sample_fmt is AV_SAMPLE_FMT_S32.
2605 * - encoding: set by user.
2606 * - decoding: set by libavcodec.
2608 int bits_per_raw_sample;
2611 * Audio channel layout.
2612 * - encoding: set by user.
2613 * - decoding: set by libavcodec.
2615 int64_t channel_layout;
2618 * Request decoder to use this channel layout if it can (0 for default)
2619 * - encoding: unused
2620 * - decoding: Set by user.
2622 int64_t request_channel_layout;
2625 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2626 * - encoding: Set by user.
2627 * - decoding: unused.
2629 float rc_max_available_vbv_use;
2632 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2633 * - encoding: Set by user.
2634 * - decoding: unused.
2636 float rc_min_vbv_overflow_use;
2639 * Hardware accelerator in use
2640 * - encoding: unused.
2641 * - decoding: Set by libavcodec
2643 struct AVHWAccel *hwaccel;
2646 * For some codecs, the time base is closer to the field rate than the frame rate.
2647 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2648 * if no telecine is used ...
2650 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2652 int ticks_per_frame;
2655 * Hardware accelerator context.
2656 * For some hardware accelerators, a global context needs to be
2657 * provided by the user. In that case, this holds display-dependent
2658 * data FFmpeg cannot instantiate itself. Please refer to the
2659 * FFmpeg HW accelerator documentation to know how to fill this
2660 * is. e.g. for VA API, this is a struct vaapi_context.
2661 * - encoding: unused
2662 * - decoding: Set by user
2664 void *hwaccel_context;
2667 * Chromaticity coordinates of the source primaries.
2668 * - encoding: Set by user
2669 * - decoding: Set by libavcodec
2671 enum AVColorPrimaries color_primaries;
2674 * Color Transfer Characteristic.
2675 * - encoding: Set by user
2676 * - decoding: Set by libavcodec
2678 enum AVColorTransferCharacteristic color_trc;
2681 * YUV colorspace type.
2682 * - encoding: Set by user
2683 * - decoding: Set by libavcodec
2685 enum AVColorSpace colorspace;
2688 * MPEG vs JPEG YUV range.
2689 * - encoding: Set by user
2690 * - decoding: Set by libavcodec
2692 enum AVColorRange color_range;
2695 * This defines the location of chroma samples.
2696 * - encoding: Set by user
2697 * - decoding: Set by libavcodec
2699 enum AVChromaLocation chroma_sample_location;
2702 * The codec may call this to execute several independent things.
2703 * It will return only after finishing all tasks.
2704 * The user may replace this with some multithreaded implementation,
2705 * the default implementation will execute the parts serially.
2706 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2707 * @param c context passed also to func
2708 * @param count the number of things to execute
2709 * @param arg2 argument passed unchanged to func
2710 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2711 * @param func function that will be called count times, with jobnr from 0 to count-1.
2712 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2713 * two instances of func executing at the same time will have the same threadnr.
2714 * @return always 0 currently, but code should handle a future improvement where when any call to func
2715 * returns < 0 no further calls to func may be done and < 0 is returned.
2716 * - encoding: Set by libavcodec, user can override.
2717 * - decoding: Set by libavcodec, user can override.
2719 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2722 * explicit P-frame weighted prediction analysis method
2724 * 1: fast blind weighting (one reference duplicate with -1 offset)
2725 * 2: smart weighting (full fade detection analysis)
2726 * - encoding: Set by user.
2727 * - decoding: unused
2729 int weighted_p_pred;
2734 * 1: Variance AQ (complexity mask)
2735 * 2: Auto-variance AQ (experimental)
2736 * - encoding: Set by user
2737 * - decoding: unused
2743 * Reduces blocking and blurring in flat and textured areas.
2744 * - encoding: Set by user
2745 * - decoding: unused
2751 * Strength of psychovisual optimization
2752 * - encoding: Set by user
2753 * - decoding: unused
2759 * Strength of psychovisual optimization
2760 * - encoding: Set by user
2761 * - decoding: unused
2767 * Number of frames for frametype and ratecontrol lookahead
2768 * - encoding: Set by user
2769 * - decoding: unused
2774 * Constant rate factor maximum
2775 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2776 * than crf_max, even if doing so would violate VBV restrictions.
2777 * - encoding: Set by user.
2778 * - decoding: unused
2782 int log_level_offset;
2784 #if FF_API_FLAC_GLOBAL_OPTS
2786 * Determines which LPC analysis algorithm to use.
2787 * - encoding: Set by user
2788 * - decoding: unused
2790 attribute_deprecated enum AVLPCType lpc_type;
2793 * Number of passes to use for Cholesky factorization during LPC analysis
2794 * - encoding: Set by user
2795 * - decoding: unused
2797 attribute_deprecated int lpc_passes;
2802 * Indicates number of picture subdivisions. Used for parallelized
2804 * - encoding: Set by user
2805 * - decoding: unused
2810 * Header containing style information for text subtitles.
2811 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2812 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2813 * the Format line following. It shouldn't include any Dialogue line.
2814 * - encoding: Set/allocated/freed by user (before avcodec_open())
2815 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2817 uint8_t *subtitle_header;
2818 int subtitle_header_size;
2821 * Current packet as passed into the decoder, to avoid having
2822 * to pass the packet into every function. Currently only valid
2823 * inside lavc and get/release_buffer callbacks.
2824 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2825 * - encoding: unused
2830 * Whether this is a copy of the context which had init() called on it.
2831 * This is used by multithreading - shared tables and picture pointers
2832 * should be freed from the original context only.
2833 * - encoding: Set by libavcodec.
2834 * - decoding: Set by libavcodec.
2839 * Which multithreading methods to use.
2840 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2841 * so clients which cannot provide future frames should not use it.
2843 * - encoding: Set by user, otherwise the default is used.
2844 * - decoding: Set by user, otherwise the default is used.
2847 #define FF_THREAD_FRAME 1 //< Decode more than one frame at once
2848 #define FF_THREAD_SLICE 2 //< Decode more than one part of a single frame at once
2851 * Which multithreading methods are in use by the codec.
2852 * - encoding: Set by libavcodec.
2853 * - decoding: Set by libavcodec.
2855 int active_thread_type;
2858 * Set by the client if its custom get_buffer() callback can be called
2859 * from another thread, which allows faster multithreaded decoding.
2860 * draw_horiz_band() will be called from other threads regardless of this setting.
2861 * Ignored if the default get_buffer() is used.
2862 * - encoding: Set by user.
2863 * - decoding: Set by user.
2865 int thread_safe_callbacks;
2868 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2869 * Used for compliant TS muxing.
2870 * - encoding: Set by libavcodec.
2871 * - decoding: unused.
2876 * Type of service that the audio stream conveys.
2877 * - encoding: Set by user.
2878 * - decoding: Set by libavcodec.
2880 enum AVAudioServiceType audio_service_type;
2883 * Current statistics for PTS correction.
2884 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2885 * - encoding: unused
2887 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2888 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2889 int64_t pts_correction_last_pts; /// PTS of the last frame
2890 int64_t pts_correction_last_dts; /// DTS of the last frame
2893 * desired sample format
2894 * - encoding: Not used.
2895 * - decoding: Set by user.
2896 * Decoder will decode to this format if it can.
2898 enum AVSampleFormat request_sample_fmt;
2905 typedef struct AVProfile {
2907 const char *name; ///< short name for the profile
2913 typedef struct AVCodec {
2915 * Name of the codec implementation.
2916 * The name is globally unique among encoders and among decoders (but an
2917 * encoder and a decoder can share the same name).
2918 * This is the primary way to find a codec from the user perspective.
2921 enum AVMediaType type;
2924 int (*init)(AVCodecContext *);
2925 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2926 int (*close)(AVCodecContext *);
2927 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2929 * Codec capabilities.
2933 struct AVCodec *next;
2936 * Will be called when seeking
2938 void (*flush)(AVCodecContext *);
2939 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2940 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2942 * Descriptive name for the codec, meant to be more human readable than name.
2943 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2945 const char *long_name;
2946 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2947 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2948 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2949 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2950 const AVClass *priv_class; ///< AVClass for the private context
2951 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2954 * @defgroup framethreading Frame-level threading support functions.
2958 * If defined, called on thread contexts when they are created.
2959 * If the codec allocates writable tables in init(), re-allocate them here.
2960 * priv_data will be set to a copy of the original.
2962 int (*init_thread_copy)(AVCodecContext *);
2964 * Copy necessary context variables from a previous thread context to the current one.
2965 * If not defined, the next thread will start automatically; otherwise, the codec
2966 * must call ff_thread_finish_setup().
2968 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2970 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2977 typedef struct AVHWAccel {
2979 * Name of the hardware accelerated codec.
2980 * The name is globally unique among encoders and among decoders (but an
2981 * encoder and a decoder can share the same name).
2986 * Type of codec implemented by the hardware accelerator.
2988 * See AVMEDIA_TYPE_xxx
2990 enum AVMediaType type;
2993 * Codec implemented by the hardware accelerator.
3000 * Supported pixel format.
3002 * Only hardware accelerated formats are supported here.
3004 enum PixelFormat pix_fmt;
3007 * Hardware accelerated codec capabilities.
3008 * see FF_HWACCEL_CODEC_CAP_*
3012 struct AVHWAccel *next;
3015 * Called at the beginning of each frame or field picture.
3017 * Meaningful frame information (codec specific) is guaranteed to
3018 * be parsed at this point. This function is mandatory.
3020 * Note that buf can be NULL along with buf_size set to 0.
3021 * Otherwise, this means the whole frame is available at this point.
3023 * @param avctx the codec context
3024 * @param buf the frame data buffer base
3025 * @param buf_size the size of the frame in bytes
3026 * @return zero if successful, a negative value otherwise
3028 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3031 * Callback for each slice.
3033 * Meaningful slice information (codec specific) is guaranteed to
3034 * be parsed at this point. This function is mandatory.
3036 * @param avctx the codec context
3037 * @param buf the slice data buffer base
3038 * @param buf_size the size of the slice in bytes
3039 * @return zero if successful, a negative value otherwise
3041 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3044 * Called at the end of each frame or field picture.
3046 * The whole picture is parsed at this point and can now be sent
3047 * to the hardware accelerator. This function is mandatory.
3049 * @param avctx the codec context
3050 * @return zero if successful, a negative value otherwise
3052 int (*end_frame)(AVCodecContext *avctx);
3055 * Size of HW accelerator private data.
3057 * Private data is allocated with av_mallocz() before
3058 * AVCodecContext.get_buffer() and deallocated after
3059 * AVCodecContext.release_buffer().
3065 * four components are given, that's all.
3066 * the last component is alpha
3068 typedef struct AVPicture {
3070 int linesize[4]; ///< number of bytes per line
3073 #if FF_API_PALETTE_CONTROL
3076 * This structure defines a method for communicating palette changes
3077 * between and demuxer and a decoder.
3079 * @deprecated Use AVPacket to send palette changes instead.
3080 * This is totally broken.
3082 #define AVPALETTE_SIZE 1024
3083 #define AVPALETTE_COUNT 256
3084 typedef struct AVPaletteControl {
3086 /* Demuxer sets this to 1 to indicate the palette has changed;
3087 * decoder resets to 0. */
3088 int palette_changed;
3090 /* 4-byte ARGB palette entries, stored in native byte order; note that
3091 * the individual palette components should be on a 8-bit scale; if
3092 * the palette data comes from an IBM VGA native format, the component
3093 * data is probably 6 bits in size and needs to be scaled. */
3094 unsigned int palette[AVPALETTE_COUNT];
3096 } AVPaletteControl attribute_deprecated;
3099 enum AVSubtitleType {
3102 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3105 * Plain text, the text field must be set by the decoder and is
3106 * authoritative. ass and pict fields may contain approximations.
3111 * Formatted text, the ass field must be set by the decoder and is
3112 * authoritative. pict and text fields may contain approximations.
3117 typedef struct AVSubtitleRect {
3118 int x; ///< top left corner of pict, undefined when pict is not set
3119 int y; ///< top left corner of pict, undefined when pict is not set
3120 int w; ///< width of pict, undefined when pict is not set
3121 int h; ///< height of pict, undefined when pict is not set
3122 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3125 * data+linesize for the bitmap of this subtitle.
3126 * can be set for text/ass as well once they where rendered
3129 enum AVSubtitleType type;
3131 char *text; ///< 0 terminated plain UTF-8 text
3134 * 0 terminated ASS/SSA compatible event line.
3135 * The pressentation of this is unaffected by the other values in this
3141 typedef struct AVSubtitle {
3142 uint16_t format; /* 0 = graphics */
3143 uint32_t start_display_time; /* relative to packet pts, in ms */
3144 uint32_t end_display_time; /* relative to packet pts, in ms */
3146 AVSubtitleRect **rects;
3147 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3150 /* packet functions */
3153 * @deprecated use NULL instead
3155 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3158 * Default packet destructor.
3160 void av_destruct_packet(AVPacket *pkt);
3163 * Initialize optional fields of a packet with default values.
3167 void av_init_packet(AVPacket *pkt);
3170 * Allocate the payload of a packet and initialize its fields with
3174 * @param size wanted payload size
3175 * @return 0 if OK, AVERROR_xxx otherwise
3177 int av_new_packet(AVPacket *pkt, int size);
3180 * Reduce packet size, correctly zeroing padding
3183 * @param size new size
3185 void av_shrink_packet(AVPacket *pkt, int size);
3188 * Increase packet size, correctly zeroing padding
3191 * @param grow_by number of bytes by which to increase the size of the packet
3193 int av_grow_packet(AVPacket *pkt, int grow_by);
3196 * @warning This is a hack - the packet memory allocation stuff is broken. The
3197 * packet is allocated if it was not really allocated.
3199 int av_dup_packet(AVPacket *pkt);
3204 * @param pkt packet to free
3206 void av_free_packet(AVPacket *pkt);
3209 * Allocate new information of a packet.
3212 * @param type side information type
3213 * @param size side information size
3214 * @return pointer to fresh allocated data or NULL otherwise
3216 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3220 * Get side information from packet.
3223 * @param type desired side information type
3224 * @param size pointer for side information size to store (optional)
3225 * @return pointer to data if present or NULL otherwise
3227 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3232 struct ReSampleContext;
3233 struct AVResampleContext;
3235 typedef struct ReSampleContext ReSampleContext;
3238 * Initialize audio resampling context.
3240 * @param output_channels number of output channels
3241 * @param input_channels number of input channels
3242 * @param output_rate output sample rate
3243 * @param input_rate input sample rate
3244 * @param sample_fmt_out requested output sample format
3245 * @param sample_fmt_in input sample format
3246 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3247 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3248 * @param linear if 1 then the used FIR filter will be linearly interpolated
3249 between the 2 closest, if 0 the closest will be used
3250 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3251 * @return allocated ReSampleContext, NULL if error occured
3253 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3254 int output_rate, int input_rate,
3255 enum AVSampleFormat sample_fmt_out,
3256 enum AVSampleFormat sample_fmt_in,
3257 int filter_length, int log2_phase_count,
3258 int linear, double cutoff);
3260 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3263 * Free resample context.
3265 * @param s a non-NULL pointer to a resample context previously
3266 * created with av_audio_resample_init()
3268 void audio_resample_close(ReSampleContext *s);
3272 * Initialize an audio resampler.
3273 * Note, if either rate is not an integer then simply scale both rates up so they are.
3274 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3275 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3276 * @param linear If 1 then the used FIR filter will be linearly interpolated
3277 between the 2 closest, if 0 the closest will be used
3278 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3280 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3283 * Resample an array of samples using a previously configured context.
3284 * @param src an array of unconsumed samples
3285 * @param consumed the number of samples of src which have been consumed are returned here
3286 * @param src_size the number of unconsumed samples available
3287 * @param dst_size the amount of space in samples available in dst
3288 * @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.
3289 * @return the number of samples written in dst or -1 if an error occurred
3291 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3295 * Compensate samplerate/timestamp drift. The compensation is done by changing
3296 * the resampler parameters, so no audible clicks or similar distortions occur
3297 * @param compensation_distance distance in output samples over which the compensation should be performed
3298 * @param sample_delta number of output samples which should be output less
3300 * example: av_resample_compensate(c, 10, 500)
3301 * here instead of 510 samples only 500 samples would be output
3303 * note, due to rounding the actual compensation might be slightly different,
3304 * especially if the compensation_distance is large and the in_rate used during init is small
3306 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3307 void av_resample_close(struct AVResampleContext *c);
3310 * Allocate memory for a picture. Call avpicture_free() to free it.
3312 * \see avpicture_fill()
3314 * @param picture the picture to be filled in
3315 * @param pix_fmt the format of the picture
3316 * @param width the width of the picture
3317 * @param height the height of the picture
3318 * @return zero if successful, a negative value if not
3320 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3323 * Free a picture previously allocated by avpicture_alloc().
3324 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3327 * @param picture the AVPicture to be freed
3329 void avpicture_free(AVPicture *picture);
3332 * Fill in the AVPicture fields.
3333 * The fields of the given AVPicture are filled in by using the 'ptr' address
3334 * which points to the image data buffer. Depending on the specified picture
3335 * format, one or multiple image data pointers and line sizes will be set.
3336 * If a planar format is specified, several pointers will be set pointing to
3337 * the different picture planes and the line sizes of the different planes
3338 * will be stored in the lines_sizes array.
3339 * Call with ptr == NULL to get the required size for the ptr buffer.
3341 * To allocate the buffer and fill in the AVPicture fields in one call,
3342 * use avpicture_alloc().
3344 * @param picture AVPicture whose fields are to be filled in
3345 * @param ptr Buffer which will contain or contains the actual image data
3346 * @param pix_fmt The format in which the picture data is stored.
3347 * @param width the width of the image in pixels
3348 * @param height the height of the image in pixels
3349 * @return size of the image data in bytes
3351 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3352 enum PixelFormat pix_fmt, int width, int height);
3355 * Copy pixel data from an AVPicture into a buffer.
3356 * The data is stored compactly, without any gaps for alignment or padding
3357 * which may be applied by avpicture_fill().
3359 * \see avpicture_get_size()
3361 * @param[in] src AVPicture containing image data
3362 * @param[in] pix_fmt The format in which the picture data is stored.
3363 * @param[in] width the width of the image in pixels.
3364 * @param[in] height the height of the image in pixels.
3365 * @param[out] dest A buffer into which picture data will be copied.
3366 * @param[in] dest_size The size of 'dest'.
3367 * @return The number of bytes written to dest, or a negative value (error code) on error.
3369 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3370 unsigned char *dest, int dest_size);
3373 * Calculate the size in bytes that a picture of the given width and height
3374 * would occupy if stored in the given picture format.
3375 * Note that this returns the size of a compact representation as generated
3376 * by avpicture_layout(), which can be smaller than the size required for e.g.
3379 * @param pix_fmt the given picture format
3380 * @param width the width of the image
3381 * @param height the height of the image
3382 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3384 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3385 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3388 * Return the short name for a pixel format.
3390 * \see av_get_pix_fmt(), av_get_pix_fmt_string().
3392 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3394 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3397 * Return a value representing the fourCC code associated to the
3398 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3401 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3404 * Put a string representing the codec tag codec_tag in buf.
3406 * @param buf_size size in bytes of buf
3407 * @return the length of the string that would have been generated if
3408 * enough space had been available, excluding the trailing null
3410 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3412 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3413 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3414 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3415 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3416 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3417 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3420 * Compute what kind of losses will occur when converting from one specific
3421 * pixel format to another.
3422 * When converting from one pixel format to another, information loss may occur.
3423 * For example, when converting from RGB24 to GRAY, the color information will
3424 * be lost. Similarly, other losses occur when converting from some formats to
3425 * other formats. These losses can involve loss of chroma, but also loss of
3426 * resolution, loss of color depth, loss due to the color space conversion, loss
3427 * of the alpha bits or loss due to color quantization.
3428 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3429 * which will occur when converting from one pixel format to another.
3431 * @param[in] dst_pix_fmt destination pixel format
3432 * @param[in] src_pix_fmt source pixel format
3433 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3434 * @return Combination of flags informing you what kind of losses will occur.
3436 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3440 * Find the best pixel format to convert to given a certain source pixel
3441 * format. When converting from one pixel format to another, information loss
3442 * may occur. For example, when converting from RGB24 to GRAY, the color
3443 * information will be lost. Similarly, other losses occur when converting from
3444 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3445 * the given pixel formats should be used to suffer the least amount of loss.
3446 * The pixel formats from which it chooses one, are determined by the
3447 * pix_fmt_mask parameter.
3450 * src_pix_fmt = PIX_FMT_YUV420P;
3451 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3452 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3455 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3456 * @param[in] src_pix_fmt source pixel format
3457 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3458 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3459 * @return The best pixel format to convert to or -1 if none was found.
3461 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3462 int has_alpha, int *loss_ptr);
3464 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3465 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3468 * Tell if an image really has transparent alpha values.
3469 * @return ored mask of FF_ALPHA_xxx constants
3471 int img_get_alpha_info(const AVPicture *src,
3472 enum PixelFormat pix_fmt, int width, int height);
3474 /* deinterlace a picture */
3475 /* deinterlace - if not supported return -1 */
3476 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3477 enum PixelFormat pix_fmt, int width, int height);
3479 /* external high level API */
3482 * If c is NULL, returns the first registered codec,
3483 * if c is non-NULL, returns the next registered codec after c,
3484 * or NULL if c is the last one.
3486 AVCodec *av_codec_next(AVCodec *c);
3489 * Return the LIBAVCODEC_VERSION_INT constant.
3491 unsigned avcodec_version(void);
3494 * Return the libavcodec build-time configuration.
3496 const char *avcodec_configuration(void);
3499 * Return the libavcodec license.
3501 const char *avcodec_license(void);
3504 * Initialize libavcodec.
3505 * If called more than once, does nothing.
3507 * @warning This function must be called before any other libavcodec
3510 * @warning This function is not thread-safe.
3512 void avcodec_init(void);
3515 * Register the codec codec and initialize libavcodec.
3517 * @see avcodec_init(), avcodec_register_all()
3519 void avcodec_register(AVCodec *codec);
3522 * Find a registered encoder with a matching codec ID.
3524 * @param id CodecID of the requested encoder
3525 * @return An encoder if one was found, NULL otherwise.
3527 AVCodec *avcodec_find_encoder(enum CodecID id);
3530 * Find a registered encoder with the specified name.
3532 * @param name name of the requested encoder
3533 * @return An encoder if one was found, NULL otherwise.
3535 AVCodec *avcodec_find_encoder_by_name(const char *name);
3538 * Find a registered decoder with a matching codec ID.
3540 * @param id CodecID of the requested decoder
3541 * @return A decoder if one was found, NULL otherwise.
3543 AVCodec *avcodec_find_decoder(enum CodecID id);
3546 * Find a registered decoder with the specified name.
3548 * @param name name of the requested decoder
3549 * @return A decoder if one was found, NULL otherwise.
3551 AVCodec *avcodec_find_decoder_by_name(const char *name);
3552 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3555 * Return a name for the specified profile, if available.
3557 * @param codec the codec that is searched for the given profile
3558 * @param profile the profile value for which a name is requested
3559 * @return A name for the profile if found, NULL otherwise.
3561 const char *av_get_profile_name(const AVCodec *codec, int profile);
3564 * Set the fields of the given AVCodecContext to default values.
3566 * @param s The AVCodecContext of which the fields should be set to default values.
3568 void avcodec_get_context_defaults(AVCodecContext *s);
3570 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3571 * we WILL change its arguments and name a few times! */
3572 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3574 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3575 * we WILL change its arguments and name a few times! */
3576 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3579 * Allocate an AVCodecContext and set its fields to default values. The
3580 * resulting struct can be deallocated by simply calling av_free().
3582 * @return An AVCodecContext filled with default values or NULL on failure.
3583 * @see avcodec_get_context_defaults
3585 AVCodecContext *avcodec_alloc_context(void);
3587 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3588 * we WILL change its arguments and name a few times! */
3589 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3591 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3592 * we WILL change its arguments and name a few times! */
3593 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3596 * Copy the settings of the source AVCodecContext into the destination
3597 * AVCodecContext. The resulting destination codec context will be
3598 * unopened, i.e. you are required to call avcodec_open() before you
3599 * can use this AVCodecContext to decode/encode video/audio data.
3601 * @param dest target codec context, should be initialized with
3602 * avcodec_alloc_context(), but otherwise uninitialized
3603 * @param src source codec context
3604 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3606 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3609 * Set the fields of the given AVFrame to default values.
3611 * @param pic The AVFrame of which the fields should be set to default values.
3613 void avcodec_get_frame_defaults(AVFrame *pic);
3616 * Allocate an AVFrame and set its fields to default values. The resulting
3617 * struct can be deallocated by simply calling av_free().
3619 * @return An AVFrame filled with default values or NULL on failure.
3620 * @see avcodec_get_frame_defaults
3622 AVFrame *avcodec_alloc_frame(void);
3624 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3625 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3626 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3629 * Return the amount of padding in pixels which the get_buffer callback must
3630 * provide around the edge of the image for codecs which do not have the
3631 * CODEC_FLAG_EMU_EDGE flag.
3633 * @return Required padding in pixels.
3635 unsigned avcodec_get_edge_width(void);
3637 * Modify width and height values so that they will result in a memory
3638 * buffer that is acceptable for the codec if you do not use any horizontal
3641 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3642 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3643 * according to avcodec_get_edge_width() before.
3645 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3647 * Modify width and height values so that they will result in a memory
3648 * buffer that is acceptable for the codec if you also ensure that all
3649 * line sizes are a multiple of the respective linesize_align[i].
3651 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3652 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3653 * according to avcodec_get_edge_width() before.
3655 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3656 int linesize_align[4]);
3658 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3660 #if FF_API_THREAD_INIT
3662 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3664 attribute_deprecated
3665 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3668 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3669 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3670 //FIXME func typedef
3673 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3674 * function the context has to be allocated.
3676 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3677 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3678 * retrieving a codec.
3680 * @warning This function is not thread safe!
3683 * avcodec_register_all();
3684 * codec = avcodec_find_decoder(CODEC_ID_H264);
3688 * context = avcodec_alloc_context();
3690 * if (avcodec_open(context, codec) < 0)
3694 * @param avctx The context which will be set up to use the given codec.
3695 * @param codec The codec to use within the context.
3696 * @return zero on success, a negative value on error
3697 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3699 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3702 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3703 * Some decoders may support multiple frames in a single AVPacket, such
3704 * decoders would then just decode the first frame. In this case,
3705 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3706 * the remaining data in order to decode the second frame etc.
3708 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3709 * decompressed frame size in bytes.
3711 * @warning You must set frame_size_ptr to the allocated size of the
3712 * output buffer before calling avcodec_decode_audio3().
3714 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3715 * the actual read bytes because some optimized bitstream readers read 32 or 64
3716 * bits at once and could read over the end.
3718 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3719 * no overreading happens for damaged MPEG streams.
3721 * @note You might have to align the input buffer avpkt->data and output buffer
3722 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3723 * necessary at all, on others it won't work at all if not aligned and on others
3724 * it will work but it will have an impact on performance.
3726 * In practice, avpkt->data should have 4 byte alignment at minimum and
3727 * samples should be 16 byte aligned unless the CPU doesn't need it
3728 * (AltiVec and SSE do).
3730 * @param avctx the codec context
3731 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3732 * @param[in,out] frame_size_ptr the output buffer size in bytes
3733 * @param[in] avpkt The input AVPacket containing the input buffer.
3734 * You can create such packet with av_init_packet() and by then setting
3735 * data and size, some decoders might in addition need other fields.
3736 * All decoders are designed to use the least fields possible though.
3737 * @return On error a negative value is returned, otherwise the number of bytes
3738 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3740 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3741 int *frame_size_ptr,
3745 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3746 * Some decoders may support multiple frames in a single AVPacket, such
3747 * decoders would then just decode the first frame.
3749 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3750 * the actual read bytes because some optimized bitstream readers read 32 or 64
3751 * bits at once and could read over the end.
3753 * @warning The end of the input buffer buf should be set to 0 to ensure that
3754 * no overreading happens for damaged MPEG streams.
3756 * @note You might have to align the input buffer avpkt->data.
3757 * The alignment requirements depend on the CPU: on some CPUs it isn't
3758 * necessary at all, on others it won't work at all if not aligned and on others
3759 * it will work but it will have an impact on performance.
3761 * In practice, avpkt->data should have 4 byte alignment at minimum.
3763 * @note Some codecs have a delay between input and output, these need to be
3764 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3766 * @param avctx the codec context
3767 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3768 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3769 * allocate memory for the actual bitmap.
3770 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3771 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3772 * decodes and the decoder tells the user once it does not need the data anymore,
3773 * the user app can at this point free/reuse/keep the memory as it sees fit.
3775 * @param[in] avpkt The input AVpacket containing the input buffer.
3776 * You can create such packet with av_init_packet() and by then setting
3777 * data and size, some decoders might in addition need other fields like
3778 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3780 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3781 * @return On error a negative value is returned, otherwise the number of bytes
3782 * used or zero if no frame could be decompressed.
3784 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3785 int *got_picture_ptr,
3789 * Decode a subtitle message.
3790 * Return a negative value on error, otherwise return the number of bytes used.
3791 * If no subtitle could be decompressed, got_sub_ptr is zero.
3792 * Otherwise, the subtitle is stored in *sub.
3793 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3794 * simplicity, because the performance difference is expect to be negligible
3795 * and reusing a get_buffer written for video codecs would probably perform badly
3796 * due to a potentially very different allocation pattern.
3798 * @param avctx the codec context
3799 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3800 freed with avsubtitle_free if *got_sub_ptr is set.
3801 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3802 * @param[in] avpkt The input AVPacket containing the input buffer.
3804 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3809 * Frees all allocated data in the given subtitle struct.
3811 * @param sub AVSubtitle to free.
3813 void avsubtitle_free(AVSubtitle *sub);
3815 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3817 uint8_t *buf, int buf_size);
3820 * Encode an audio frame from samples into buf.
3822 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3823 * However, for PCM audio the user will know how much space is needed
3824 * because it depends on the value passed in buf_size as described
3825 * below. In that case a lower value can be used.
3827 * @param avctx the codec context
3828 * @param[out] buf the output buffer
3829 * @param[in] buf_size the output buffer size
3830 * @param[in] samples the input buffer containing the samples
3831 * The number of samples read from this buffer is frame_size*channels,
3832 * both of which are defined in avctx.
3833 * For PCM audio the number of samples read from samples is equal to
3834 * buf_size * input_sample_size / output_sample_size.
3835 * @return On error a negative value is returned, on success zero or the number
3836 * of bytes used to encode the data read from the input buffer.
3838 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3839 const short *samples);
3842 * Encode a video frame from pict into buf.
3843 * The input picture should be
3844 * stored using a specific format, namely avctx.pix_fmt.
3846 * @param avctx the codec context
3847 * @param[out] buf the output buffer for the bitstream of encoded frame
3848 * @param[in] buf_size the size of the output buffer in bytes
3849 * @param[in] pict the input picture to encode
3850 * @return On error a negative value is returned, on success zero or the number
3851 * of bytes used from the output buffer.
3853 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3854 const AVFrame *pict);
3855 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3856 const AVSubtitle *sub);
3858 int avcodec_close(AVCodecContext *avctx);
3861 * Register all the codecs, parsers and bitstream filters which were enabled at
3862 * configuration time. If you do not call this function you can select exactly
3863 * which formats you want to support, by using the individual registration
3866 * @see avcodec_register
3867 * @see av_register_codec_parser
3868 * @see av_register_bitstream_filter
3870 void avcodec_register_all(void);
3873 * Flush buffers, should be called when seeking or when switching to a different stream.
3875 void avcodec_flush_buffers(AVCodecContext *avctx);
3877 void avcodec_default_free_buffers(AVCodecContext *s);
3879 /* misc useful functions */
3881 #if FF_API_OLD_FF_PICT_TYPES
3883 * Return a single letter to describe the given picture type pict_type.
3885 * @param[in] pict_type the picture type
3886 * @return A single character representing the picture type.
3887 * @deprecated Use av_get_picture_type_char() instead.
3889 attribute_deprecated
3890 char av_get_pict_type_char(int pict_type);
3894 * Return codec bits per sample.
3896 * @param[in] codec_id the codec
3897 * @return Number of bits per sample or zero if unknown for the given codec.
3899 int av_get_bits_per_sample(enum CodecID codec_id);
3901 #if FF_API_OLD_SAMPLE_FMT
3903 * @deprecated Use av_get_bits_per_sample_fmt() instead.
3905 attribute_deprecated
3906 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
3910 typedef struct AVCodecParserContext {
3912 struct AVCodecParser *parser;
3913 int64_t frame_offset; /* offset of the current frame */
3914 int64_t cur_offset; /* current offset
3915 (incremented by each av_parser_parse()) */
3916 int64_t next_frame_offset; /* offset of the next frame */
3918 int pict_type; /* XXX: Put it back in AVCodecContext. */
3920 * This field is used for proper frame duration computation in lavf.
3921 * It signals, how much longer the frame duration of the current frame
3922 * is compared to normal frame duration.
3924 * frame_duration = (1 + repeat_pict) * time_base
3926 * It is used by codecs like H.264 to display telecined material.
3928 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3929 int64_t pts; /* pts of the current frame */
3930 int64_t dts; /* dts of the current frame */
3935 int fetch_timestamp;
3937 #define AV_PARSER_PTS_NB 4
3938 int cur_frame_start_index;
3939 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3940 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3941 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3944 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3945 #define PARSER_FLAG_ONCE 0x0002
3946 /// Set if the parser has a valid file offset
3947 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3949 int64_t offset; ///< byte offset from starting packet start
3950 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3953 * Set by parser to 1 for key frames and 0 for non-key frames.
3954 * It is initialized to -1, so if the parser doesn't set this flag,
3955 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3961 * Time difference in stream time base units from the pts of this
3962 * packet to the point at which the output from the decoder has converged
3963 * independent from the availability of previous frames. That is, the
3964 * frames are virtually identical no matter if decoding started from
3965 * the very first frame or from this keyframe.
3966 * Is AV_NOPTS_VALUE if unknown.
3967 * This field is not the display duration of the current frame.
3968 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3971 * The purpose of this field is to allow seeking in streams that have no
3972 * keyframes in the conventional sense. It corresponds to the
3973 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3974 * essential for some types of subtitle streams to ensure that all
3975 * subtitles are correctly displayed after seeking.
3977 int64_t convergence_duration;
3979 // Timestamp generation support:
3981 * Synchronization point for start of timestamp generation.
3983 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3986 * For example, this corresponds to presence of H.264 buffering period
3992 * Offset of the current timestamp against last timestamp sync point in
3993 * units of AVCodecContext.time_base.
3995 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3996 * contain a valid timestamp offset.
3998 * Note that the timestamp of sync point has usually a nonzero
3999 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4000 * the next frame after timestamp sync point will be usually 1.
4002 * For example, this corresponds to H.264 cpb_removal_delay.
4004 int dts_ref_dts_delta;
4007 * Presentation delay of current frame in units of AVCodecContext.time_base.
4009 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4010 * contain valid non-negative timestamp delta (presentation time of a frame
4011 * must not lie in the past).
4013 * This delay represents the difference between decoding and presentation
4014 * time of the frame.
4016 * For example, this corresponds to H.264 dpb_output_delay.
4021 * Position of the packet in file.
4023 * Analogous to cur_frame_pts/dts
4025 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4028 * Byte position of currently parsed frame in stream.
4033 * Previous frame byte position.
4036 } AVCodecParserContext;
4038 typedef struct AVCodecParser {
4039 int codec_ids[5]; /* several codec IDs are permitted */
4041 int (*parser_init)(AVCodecParserContext *s);
4042 int (*parser_parse)(AVCodecParserContext *s,
4043 AVCodecContext *avctx,
4044 const uint8_t **poutbuf, int *poutbuf_size,
4045 const uint8_t *buf, int buf_size);
4046 void (*parser_close)(AVCodecParserContext *s);
4047 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4048 struct AVCodecParser *next;
4051 AVCodecParser *av_parser_next(AVCodecParser *c);
4053 void av_register_codec_parser(AVCodecParser *parser);
4054 AVCodecParserContext *av_parser_init(int codec_id);
4059 * @param s parser context.
4060 * @param avctx codec context.
4061 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4062 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4063 * @param buf input buffer.
4064 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4065 * @param pts input presentation timestamp.
4066 * @param dts input decoding timestamp.
4067 * @param pos input byte position in stream.
4068 * @return the number of bytes of the input bitstream used.
4073 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4080 * decode_frame(data, size);
4084 int av_parser_parse2(AVCodecParserContext *s,
4085 AVCodecContext *avctx,
4086 uint8_t **poutbuf, int *poutbuf_size,
4087 const uint8_t *buf, int buf_size,
4088 int64_t pts, int64_t dts,
4091 int av_parser_change(AVCodecParserContext *s,
4092 AVCodecContext *avctx,
4093 uint8_t **poutbuf, int *poutbuf_size,
4094 const uint8_t *buf, int buf_size, int keyframe);
4095 void av_parser_close(AVCodecParserContext *s);
4098 typedef struct AVBitStreamFilterContext {
4100 struct AVBitStreamFilter *filter;
4101 AVCodecParserContext *parser;
4102 struct AVBitStreamFilterContext *next;
4103 } AVBitStreamFilterContext;
4106 typedef struct AVBitStreamFilter {
4109 int (*filter)(AVBitStreamFilterContext *bsfc,
4110 AVCodecContext *avctx, const char *args,
4111 uint8_t **poutbuf, int *poutbuf_size,
4112 const uint8_t *buf, int buf_size, int keyframe);
4113 void (*close)(AVBitStreamFilterContext *bsfc);
4114 struct AVBitStreamFilter *next;
4115 } AVBitStreamFilter;
4117 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4118 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4119 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4120 AVCodecContext *avctx, const char *args,
4121 uint8_t **poutbuf, int *poutbuf_size,
4122 const uint8_t *buf, int buf_size, int keyframe);
4123 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4125 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4130 * Reallocate the given block if it is not large enough, otherwise do nothing.
4134 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4137 * Allocate a buffer, reusing the given one if large enough.
4139 * Contrary to av_fast_realloc the current buffer contents might not be
4140 * preserved and on error the old buffer is freed, thus no special
4141 * handling to avoid memleaks is necessary.
4143 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4144 * @param size size of the buffer *ptr points to
4145 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4146 * *size 0 if an error occurred.
4148 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4151 * Copy image src to dst. Wraps av_picture_data_copy() above.
4153 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4154 enum PixelFormat pix_fmt, int width, int height);
4157 * Crop image top and left side.
4159 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4160 enum PixelFormat pix_fmt, int top_band, int left_band);
4165 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4166 int padtop, int padbottom, int padleft, int padright, int *color);
4169 * Encode extradata length to a buffer. Used by xiph codecs.
4171 * @param s buffer to write to; must be at least (v/255+1) bytes long
4172 * @param v size of extradata in bytes
4173 * @return number of bytes written to the buffer.
4175 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4178 * Logs a generic warning message about a missing feature. This function is
4179 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4180 * only, and would normally not be used by applications.
4181 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4182 * a pointer to an AVClass struct
4183 * @param[in] feature string containing the name of the missing feature
4184 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4185 * If want_sample is non-zero, additional verbage will be added to the log
4186 * message which tells the user how to report samples to the development
4189 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4192 * Log a generic warning message asking for a sample. This function is
4193 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4194 * only, and would normally not be used by applications.
4195 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4196 * a pointer to an AVClass struct
4197 * @param[in] msg string containing an optional message, or NULL if no message
4199 void av_log_ask_for_sample(void *avc, const char *msg, ...);
4202 * Register the hardware accelerator hwaccel.
4204 void av_register_hwaccel(AVHWAccel *hwaccel);
4207 * If hwaccel is NULL, returns the first registered hardware accelerator,
4208 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4209 * after hwaccel, or NULL if hwaccel is the last one.
4211 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4215 * Lock operation used by lockmgr
4218 AV_LOCK_CREATE, ///< Create a mutex
4219 AV_LOCK_OBTAIN, ///< Lock the mutex
4220 AV_LOCK_RELEASE, ///< Unlock the mutex
4221 AV_LOCK_DESTROY, ///< Free mutex resources
4225 * Register a user provided lock manager supporting the operations
4226 * specified by AVLockOp. mutex points to a (void *) where the
4227 * lockmgr should store/get a pointer to a user allocated mutex. It's
4228 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4230 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4231 * callback during the call to av_lockmgr_register().
4232 * Thus, the application must be prepared to handle that.
4233 * If cb is set to NULL the lockmgr will be unregistered.
4234 * Also note that during unregistration the previously registered
4235 * lockmgr callback may also be invoked.
4237 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4239 #endif /* AVCODEC_AVCODEC_H */