2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; 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"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
38 #include "libavcodec/version.h"
41 * Identify the syntax and semantics of the bitstream.
42 * The principle is roughly:
43 * Two decoders with the same ID can decode the same streams.
44 * Two encoders with the same ID can encode compatible streams.
45 * There may be slight deviations from the principle due to implementation
48 * If you add a codec ID to this list, add it so that
49 * 1. no value of a existing codec ID changes (that would break ABI),
50 * 2. it is as close as possible to similar codecs.
57 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
58 CODEC_ID_MPEG2VIDEO_XVMC,
95 CODEC_ID_INTERPLAY_VIDEO,
107 CODEC_ID_TRUEMOTION1,
134 CODEC_ID_TRUEMOTION2,
151 CODEC_ID_DSICINVIDEO,
152 CODEC_ID_TIERTEXSEQVIDEO,
161 CODEC_ID_BETHSOFTVID,
179 CODEC_ID_MOTIONPIXELS,
197 CODEC_ID_IFF_BYTERUN1,
214 /* various PCM "codecs" */
215 CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
216 CODEC_ID_PCM_S16LE= 0x10000,
232 CODEC_ID_PCM_S24DAUD,
234 CODEC_ID_PCM_S16LE_PLANAR,
244 /* various ADPCM codecs */
245 CODEC_ID_ADPCM_IMA_QT= 0x11000,
246 CODEC_ID_ADPCM_IMA_WAV,
247 CODEC_ID_ADPCM_IMA_DK3,
248 CODEC_ID_ADPCM_IMA_DK4,
249 CODEC_ID_ADPCM_IMA_WS,
250 CODEC_ID_ADPCM_IMA_SMJPEG,
259 CODEC_ID_ADPCM_YAMAHA,
260 CODEC_ID_ADPCM_SBPRO_4,
261 CODEC_ID_ADPCM_SBPRO_3,
262 CODEC_ID_ADPCM_SBPRO_2,
264 CODEC_ID_ADPCM_IMA_AMV,
265 CODEC_ID_ADPCM_EA_R1,
266 CODEC_ID_ADPCM_EA_R3,
267 CODEC_ID_ADPCM_EA_R2,
268 CODEC_ID_ADPCM_IMA_EA_SEAD,
269 CODEC_ID_ADPCM_IMA_EA_EACS,
270 CODEC_ID_ADPCM_EA_XAS,
271 CODEC_ID_ADPCM_EA_MAXIS_XA,
272 CODEC_ID_ADPCM_IMA_ISS,
276 CODEC_ID_AMR_NB= 0x12000,
279 /* RealAudio codecs*/
280 CODEC_ID_RA_144= 0x13000,
283 /* various DPCM codecs */
284 CODEC_ID_ROQ_DPCM= 0x14000,
285 CODEC_ID_INTERPLAY_DPCM,
290 CODEC_ID_MP2= 0x15000,
291 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
309 CODEC_ID_WESTWOOD_SND1,
310 CODEC_ID_GSM, ///< as in Berlin toast format
318 CODEC_ID_DSICINAUDIO,
322 CODEC_ID_GSM_MS, /* as found in WAV */
331 CODEC_ID_WMALOSSLESS,
340 CODEC_ID_BINKAUDIO_RDFT,
341 CODEC_ID_BINKAUDIO_DCT,
345 /* subtitle codecs */
346 CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
347 CODEC_ID_DVD_SUBTITLE= 0x17000,
348 CODEC_ID_DVB_SUBTITLE,
349 CODEC_ID_TEXT, ///< raw UTF-8 text
353 CODEC_ID_HDMV_PGS_SUBTITLE,
354 CODEC_ID_DVB_TELETEXT,
357 /* other specific kind of codecs (generally used for attachments) */
358 CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
359 CODEC_ID_TTF= 0x18000,
361 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
363 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
364 * stream (only used by libavformat) */
365 CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
368 #if FF_API_OLD_SAMPLE_FMT
369 #define SampleFormat AVSampleFormat
371 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
372 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
373 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
374 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
375 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
376 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
377 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
380 #if FF_API_OLD_AUDIOCONVERT
381 #include "libavutil/audioconvert.h"
383 /* Audio channel masks */
384 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
385 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
386 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
387 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
388 #define CH_BACK_LEFT AV_CH_BACK_LEFT
389 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
390 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
391 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
392 #define CH_BACK_CENTER AV_CH_BACK_CENTER
393 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
394 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
395 #define CH_TOP_CENTER AV_CH_TOP_CENTER
396 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
397 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
398 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
399 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
400 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
401 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
402 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
403 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
405 /** Channel mask value used for AVCodecContext.request_channel_layout
406 to indicate that the user requests the channel order of the decoder output
407 to be the native codec channel order. */
408 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
410 /* Audio channel convenience macros */
411 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
412 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
413 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
414 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
415 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
416 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
417 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
418 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
419 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
420 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
421 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
422 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
423 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
424 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
425 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
429 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
432 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
433 * This is mainly needed because some optimized bitstream readers read
434 * 32 or 64 bit at once and could read over the end.<br>
435 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
436 * MPEG bitstreams could cause overread and segfault.
438 #define FF_INPUT_BUFFER_PADDING_SIZE 8
441 * minimum encoding buffer size
442 * Used to avoid some checks during header writing.
444 #define FF_MIN_BUFFER_SIZE 16384
448 * motion estimation type.
451 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
455 ME_EPZS, ///< enhanced predictive zonal search
456 ME_X1, ///< reserved for experiments
457 ME_HEX, ///< hexagon based search
458 ME_UMH, ///< uneven multi-hexagon search
459 ME_ITER, ///< iterative search
460 ME_TESA, ///< transformed exhaustive search algorithm
464 /* We leave some space between them for extensions (drop some
465 * keyframes for intra-only or drop just some bidir frames). */
466 AVDISCARD_NONE =-16, ///< discard nothing
467 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
468 AVDISCARD_NONREF = 8, ///< discard all non reference
469 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
470 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
471 AVDISCARD_ALL = 48, ///< discard all
474 enum AVColorPrimaries{
475 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
476 AVCOL_PRI_UNSPECIFIED=2,
478 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
479 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
480 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
482 AVCOL_PRI_NB , ///< Not part of ABI
485 enum AVColorTransferCharacteristic{
486 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
487 AVCOL_TRC_UNSPECIFIED=2,
488 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
489 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
490 AVCOL_TRC_NB , ///< Not part of ABI
495 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
496 AVCOL_SPC_UNSPECIFIED=2,
498 AVCOL_SPC_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
499 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
500 AVCOL_SPC_SMPTE240M =7,
501 AVCOL_SPC_NB , ///< Not part of ABI
505 AVCOL_RANGE_UNSPECIFIED=0,
506 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
507 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
508 AVCOL_RANGE_NB , ///< Not part of ABI
512 * X X 3 4 X X are luma samples,
513 * 1 2 1-6 are possible chroma positions
514 * X X 5 6 X 0 is undefined/unknown position
516 enum AVChromaLocation{
517 AVCHROMA_LOC_UNSPECIFIED=0,
518 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
519 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
520 AVCHROMA_LOC_TOPLEFT =3, ///< DV
522 AVCHROMA_LOC_BOTTOMLEFT =5,
523 AVCHROMA_LOC_BOTTOM =6,
524 AVCHROMA_LOC_NB , ///< Not part of ABI
527 #if FF_API_FLAC_GLOBAL_OPTS
531 attribute_deprecated enum AVLPCType {
532 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
533 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
534 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
535 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
536 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
537 AV_LPC_TYPE_NB , ///< Not part of ABI
541 enum AVAudioServiceType {
542 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
543 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
544 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
545 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
546 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
547 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
548 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
549 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
550 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
551 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
554 typedef struct RcOverride{
557 int qscale; // If this is 0 then quality_factor will be used instead.
558 float quality_factor;
561 #define FF_MAX_B_FRAMES 16
564 These flags can be passed in AVCodecContext.flags before initialization.
565 Note: Not everything is supported yet.
568 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
569 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
570 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
571 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
572 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
573 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
574 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
577 * The parent program guarantees that the input for B-frames containing
578 * streams is not written to for at least s->max_b_frames+1 frames, if
579 * this is not set the input will be copied.
581 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
582 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
583 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
584 #if FF_API_MJPEG_GLOBAL_OPTS
585 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
587 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
588 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
589 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
590 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
591 location instead of only at frame boundaries. */
592 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
593 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
594 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
595 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
596 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
598 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
599 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
600 /* Fx : Flag for h263+ extra options */
601 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
602 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
603 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
605 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
606 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
607 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
608 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
609 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
611 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
612 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
613 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
615 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
616 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
617 #define CODEC_FLAG_CLOSED_GOP 0x80000000
618 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
619 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
620 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
621 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
622 #if FF_API_X264_GLOBAL_OPTS
623 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
624 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
625 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
626 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
627 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
628 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
629 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
631 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
632 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
634 #if FF_API_SNOW_GLOBAL_OPTS
635 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
637 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
638 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
640 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
641 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
642 #if FF_API_MPEGVIDEO_GLOBAL_OPTS
643 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
645 #if FF_API_LAME_GLOBAL_OPTS
646 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
648 #if FF_API_X264_GLOBAL_OPTS
649 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
650 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
651 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
652 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
655 /* Unsupported options :
656 * Syntax Arithmetic coding (SAC)
657 * Reference Picture Selection
658 * Independent Segment Decoding */
660 /* codec capabilities */
662 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
664 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
665 * If not set, it might not use get_buffer() at all or use operations that
666 * assume the buffer was allocated by avcodec_default_get_buffer.
668 #define CODEC_CAP_DR1 0x0002
669 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
670 #define CODEC_CAP_PARSE_ONLY 0x0004
671 #define CODEC_CAP_TRUNCATED 0x0008
672 /* Codec can export data for HW decoding (XvMC). */
673 #define CODEC_CAP_HWACCEL 0x0010
675 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
676 * If this is not set, the codec is guaranteed to never be fed with NULL data.
678 #define CODEC_CAP_DELAY 0x0020
680 * Codec can be fed a final frame with a smaller size.
681 * This can be used to prevent truncation of the last audio samples.
683 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
685 * Codec can export data for HW decoding (VDPAU).
687 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
689 * Codec can output multiple frames per AVPacket
690 * Normally demuxers return one frame at a time, demuxers which do not do
691 * are connected to a parser to split what they return into proper frames.
692 * This flag is reserved to the very rare category of codecs which have a
693 * bitstream that cannot be split into frames without timeconsuming
694 * operations like full decoding. Demuxers carring such bitstreams thus
695 * may return multiple frames in a packet. This has many disadvantages like
696 * prohibiting stream copy in many cases thus it should only be considered
699 #define CODEC_CAP_SUBFRAMES 0x0100
701 * Codec is experimental and is thus avoided in favor of non experimental
704 #define CODEC_CAP_EXPERIMENTAL 0x0200
706 * Codec should fill in channel configuration and samplerate instead of container
708 #define CODEC_CAP_CHANNEL_CONF 0x0400
710 * Codec is able to deal with negative linesizes
712 #define CODEC_CAP_NEG_LINESIZES 0x0800
714 * Codec supports frame-level multithreading.
716 #define CODEC_CAP_FRAME_THREADS 0x1000
718 * Codec supports slice-based (or partition-based) multithreading.
720 #define CODEC_CAP_SLICE_THREADS 0x2000
722 //The following defines may change, don't expect compatibility if you use them.
723 #define MB_TYPE_INTRA4x4 0x0001
724 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
725 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
726 #define MB_TYPE_16x16 0x0008
727 #define MB_TYPE_16x8 0x0010
728 #define MB_TYPE_8x16 0x0020
729 #define MB_TYPE_8x8 0x0040
730 #define MB_TYPE_INTERLACED 0x0080
731 #define MB_TYPE_DIRECT2 0x0100 //FIXME
732 #define MB_TYPE_ACPRED 0x0200
733 #define MB_TYPE_GMC 0x0400
734 #define MB_TYPE_SKIP 0x0800
735 #define MB_TYPE_P0L0 0x1000
736 #define MB_TYPE_P1L0 0x2000
737 #define MB_TYPE_P0L1 0x4000
738 #define MB_TYPE_P1L1 0x8000
739 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
740 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
741 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
742 #define MB_TYPE_QUANT 0x00010000
743 #define MB_TYPE_CBP 0x00020000
744 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
748 * This specifies the area which should be displayed.
749 * Note there may be multiple such areas for one frame.
751 typedef struct AVPanScan{
754 * - encoding: Set by user.
755 * - decoding: Set by libavcodec.
760 * width and height in 1/16 pel
761 * - encoding: Set by user.
762 * - decoding: Set by libavcodec.
768 * position of the top left corner in 1/16 pel for up to 3 fields/frames
769 * - encoding: Set by user.
770 * - decoding: Set by libavcodec.
772 int16_t position[3][2];
775 #define FF_QSCALE_TYPE_MPEG1 0
776 #define FF_QSCALE_TYPE_MPEG2 1
777 #define FF_QSCALE_TYPE_H264 2
778 #define FF_QSCALE_TYPE_VP56 3
780 #define FF_BUFFER_TYPE_INTERNAL 1
781 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
782 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
783 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
785 #if FF_API_OLD_FF_PICT_TYPES
786 /* DEPRECATED, directly use the AV_PICTURE_TYPE_* enum values */
787 #define FF_I_TYPE AV_PICTURE_TYPE_I ///< Intra
788 #define FF_P_TYPE AV_PICTURE_TYPE_P ///< Predicted
789 #define FF_B_TYPE AV_PICTURE_TYPE_B ///< Bi-dir predicted
790 #define FF_S_TYPE AV_PICTURE_TYPE_S ///< S(GMC)-VOP MPEG4
791 #define FF_SI_TYPE AV_PICTURE_TYPE_SI ///< Switching Intra
792 #define FF_SP_TYPE AV_PICTURE_TYPE_SP ///< Switching Predicted
793 #define FF_BI_TYPE AV_PICTURE_TYPE_BI
796 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
797 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
798 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
799 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
801 enum AVPacketSideDataType {
805 typedef struct AVPacket {
807 * Presentation timestamp in AVStream->time_base units; the time at which
808 * the decompressed packet will be presented to the user.
809 * Can be AV_NOPTS_VALUE if it is not stored in the file.
810 * pts MUST be larger or equal to dts as presentation cannot happen before
811 * decompression, unless one wants to view hex dumps. Some formats misuse
812 * the terms dts and pts/cts to mean something different. Such timestamps
813 * must be converted to true pts/dts before they are stored in AVPacket.
817 * Decompression timestamp in AVStream->time_base units; the time at which
818 * the packet is decompressed.
819 * Can be AV_NOPTS_VALUE if it is not stored in the file.
826 * A combination of AV_PKT_FLAG values
830 * Additional packet data that can be provided by the container.
831 * Packet can contain several types of side information.
836 enum AVPacketSideDataType type;
841 * Duration of this packet in AVStream->time_base units, 0 if unknown.
842 * Equals next_pts - this_pts in presentation order.
845 void (*destruct)(struct AVPacket *);
847 int64_t pos; ///< byte position in stream, -1 if unknown
850 * Time difference in AVStream->time_base units from the pts of this
851 * packet to the point at which the output from the decoder has converged
852 * independent from the availability of previous frames. That is, the
853 * frames are virtually identical no matter if decoding started from
854 * the very first frame or from this keyframe.
855 * Is AV_NOPTS_VALUE if unknown.
856 * This field is not the display duration of the current packet.
857 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
860 * The purpose of this field is to allow seeking in streams that have no
861 * keyframes in the conventional sense. It corresponds to the
862 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
863 * essential for some types of subtitle streams to ensure that all
864 * subtitles are correctly displayed after seeking.
866 int64_t convergence_duration;
868 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
869 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
873 * New fields can be added to the end of AVFRAME with minor version
874 * bumps. Removal, reordering and changes to existing fields require
875 * a major version bump.
876 * sizeof(AVFrame) must not be used outside libav*.
878 typedef struct AVFrame {
880 * pointer to the picture planes.
881 * This might be different from the first allocated byte
888 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
889 * This isn't used by libavcodec unless the default get/release_buffer() is used.
895 * 1 -> keyframe, 0-> not
896 * - encoding: Set by libavcodec.
897 * - decoding: Set by libavcodec.
902 * Picture type of the frame, see ?_TYPE below.
903 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
904 * - decoding: Set by libavcodec.
906 enum AVPictureType pict_type;
909 * presentation timestamp in time_base units (time when frame should be shown to user)
910 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
911 * - encoding: MUST be set by user.
912 * - decoding: Set by libavcodec.
917 * picture number in bitstream order
919 * - decoding: Set by libavcodec.
921 int coded_picture_number;
923 * picture number in display order
925 * - decoding: Set by libavcodec.
927 int display_picture_number;
930 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
931 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
932 * - decoding: Set by libavcodec.
937 * buffer age (1->was last buffer and dint change, 2->..., ...).
938 * Set to INT_MAX if the buffer has not been used yet.
940 * - decoding: MUST be set by get_buffer().
945 * is this picture used as reference
946 * The values for this are the same as the MpegEncContext.picture_structure
947 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
948 * Set to 4 for delayed, non-reference frames.
950 * - decoding: Set by libavcodec. (before get_buffer() call)).
957 * - decoding: Set by libavcodec.
959 int8_t *qscale_table;
963 * - decoding: Set by libavcodec.
968 * mbskip_table[mb]>=1 if MB didn't change
969 * stride= mb_width = (width+15)>>4
971 * - decoding: Set by libavcodec.
973 uint8_t *mbskip_table;
976 * motion vector table
979 * int mv_sample_log2= 4 - motion_subsample_log2;
980 * int mb_width= (width+15)>>4;
981 * int mv_stride= (mb_width << mv_sample_log2) + 1;
982 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
984 * - encoding: Set by user.
985 * - decoding: Set by libavcodec.
987 int16_t (*motion_val[2])[2];
990 * macroblock type table
991 * mb_type_base + mb_width + 2
992 * - encoding: Set by user.
993 * - decoding: Set by libavcodec.
998 * log2 of the size of the block which a single vector in motion_val represents:
999 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1000 * - encoding: unused
1001 * - decoding: Set by libavcodec.
1003 uint8_t motion_subsample_log2;
1006 * for some private data of the user
1007 * - encoding: unused
1008 * - decoding: Set by user.
1014 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1015 * - decoding: unused
1020 * type of the buffer (to keep track of who has to deallocate data[*])
1021 * - encoding: Set by the one who allocates it.
1022 * - decoding: Set by the one who allocates it.
1023 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1028 * When decoding, this signals how much the picture must be delayed.
1029 * extra_delay = repeat_pict / (2*fps)
1030 * - encoding: unused
1031 * - decoding: Set by libavcodec.
1041 * The content of the picture is interlaced.
1042 * - encoding: Set by user.
1043 * - decoding: Set by libavcodec. (default 0)
1045 int interlaced_frame;
1048 * If the content is interlaced, is top field displayed first.
1049 * - encoding: Set by user.
1050 * - decoding: Set by libavcodec.
1052 int top_field_first;
1056 * - encoding: Set by user.
1057 * - decoding: Set by libavcodec.
1059 AVPanScan *pan_scan;
1062 * Tell user application that palette has changed from previous frame.
1063 * - encoding: ??? (no palette-enabled encoder yet)
1064 * - decoding: Set by libavcodec. (default 0).
1066 int palette_has_changed;
1069 * codec suggestion on buffer type if != 0
1070 * - encoding: unused
1071 * - decoding: Set by libavcodec. (before get_buffer() call)).
1077 * - encoding: unused
1078 * - decoding: Set by libavcodec.
1083 * motion reference frame index
1084 * the order in which these are stored can depend on the codec.
1085 * - encoding: Set by user.
1086 * - decoding: Set by libavcodec.
1088 int8_t *ref_index[2];
1091 * reordered opaque 64bit (generally an integer or a double precision float
1092 * PTS but can be anything).
1093 * The user sets AVCodecContext.reordered_opaque to represent the input at
1095 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1096 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1097 * @deprecated in favor of pkt_pts
1098 * - encoding: unused
1099 * - decoding: Read by user.
1101 int64_t reordered_opaque;
1104 * hardware accelerator private data (Libav-allocated)
1105 * - encoding: unused
1106 * - decoding: Set by libavcodec
1108 void *hwaccel_picture_private;
1111 * reordered pts from the last AVPacket that has been input into the decoder
1112 * - encoding: unused
1113 * - decoding: Read by user.
1118 * dts from the last AVPacket that has been input into the decoder
1119 * - encoding: unused
1120 * - decoding: Read by user.
1125 * the AVCodecContext which ff_thread_get_buffer() was last called on
1126 * - encoding: Set by libavcodec.
1127 * - decoding: Set by libavcodec.
1129 struct AVCodecContext *owner;
1132 * used by multithreading to store frame-specific info
1133 * - encoding: Set by libavcodec.
1134 * - decoding: Set by libavcodec.
1136 void *thread_opaque;
1140 * main external API structure.
1141 * New fields can be added to the end with minor version bumps.
1142 * Removal, reordering and changes to existing fields require a major
1144 * sizeof(AVCodecContext) must not be used outside libav*.
1146 typedef struct AVCodecContext {
1148 * information on struct for av_log
1149 * - set by avcodec_alloc_context
1151 const AVClass *av_class;
1153 * the average bitrate
1154 * - encoding: Set by user; unused for constant quantizer encoding.
1155 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1160 * number of bits the bitstream is allowed to diverge from the reference.
1161 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1162 * - encoding: Set by user; unused for constant quantizer encoding.
1163 * - decoding: unused
1165 int bit_rate_tolerance;
1169 * - encoding: Set by user.
1170 * - decoding: Set by user.
1175 * Some codecs need additional format info. It is stored here.
1176 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1177 * specific codec MUST set it correctly otherwise stream copy breaks.
1178 * In general use of this field by muxers is not recommanded.
1179 * - encoding: Set by libavcodec.
1180 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1185 * Motion estimation algorithm used for video coding.
1186 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1187 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1188 * - encoding: MUST be set by user.
1189 * - decoding: unused
1194 * some codecs need / can use extradata like Huffman tables.
1195 * mjpeg: Huffman tables
1196 * rv10: additional flags
1197 * mpeg4: global headers (they can be in the bitstream or here)
1198 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1199 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1200 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1201 * - encoding: Set/allocated/freed by libavcodec.
1202 * - decoding: Set/allocated/freed by user.
1208 * This is the fundamental unit of time (in seconds) in terms
1209 * of which frame timestamps are represented. For fixed-fps content,
1210 * timebase should be 1/framerate and timestamp increments should be
1212 * - encoding: MUST be set by user.
1213 * - decoding: Set by libavcodec.
1215 AVRational time_base;
1219 * picture width / height.
1220 * - encoding: MUST be set by user.
1221 * - decoding: Set by libavcodec.
1222 * Note: For compatibility it is possible to set this instead of
1223 * coded_width/height before decoding.
1227 #define FF_ASPECT_EXTENDED 15
1230 * the number of pictures in a group of pictures, or 0 for intra_only
1231 * - encoding: Set by user.
1232 * - decoding: unused
1237 * Pixel format, see PIX_FMT_xxx.
1238 * May be set by the demuxer if known from headers.
1239 * May be overriden by the decoder if it knows better.
1240 * - encoding: Set by user.
1241 * - decoding: Set by user if known, overridden by libavcodec if known
1243 enum PixelFormat pix_fmt;
1246 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1247 * decoder to draw a horizontal band. It improves cache usage. Not
1248 * all codecs can do that. You must check the codec capabilities
1250 * When multithreading is used, it may be called from multiple threads
1251 * at the same time; threads might draw different parts of the same AVFrame,
1252 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1254 * The function is also used by hardware acceleration APIs.
1255 * It is called at least once during frame decoding to pass
1256 * the data needed for hardware render.
1257 * In that mode instead of pixel data, AVFrame points to
1258 * a structure specific to the acceleration API. The application
1259 * reads the structure and can change some fields to indicate progress
1261 * - encoding: unused
1262 * - decoding: Set by user.
1263 * @param height the height of the slice
1264 * @param y the y position of the slice
1265 * @param type 1->top field, 2->bottom field, 3->frame
1266 * @param offset offset into the AVFrame.data from which the slice should be read
1268 void (*draw_horiz_band)(struct AVCodecContext *s,
1269 const AVFrame *src, int offset[4],
1270 int y, int type, int height);
1273 int sample_rate; ///< samples per second
1274 int channels; ///< number of audio channels
1277 * audio sample format
1278 * - encoding: Set by user.
1279 * - decoding: Set by libavcodec.
1281 enum AVSampleFormat sample_fmt; ///< sample format
1283 /* The following data should not be initialized. */
1285 * Samples per packet, initialized when calling 'init'.
1288 int frame_number; ///< audio or video frame number
1291 * Number of frames the decoded output will be delayed relative to
1292 * the encoded input.
1293 * - encoding: Set by libavcodec.
1294 * - decoding: unused
1298 /* - encoding parameters */
1299 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1300 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1304 * - encoding: Set by user.
1305 * - decoding: unused
1311 * - encoding: Set by user.
1312 * - decoding: unused
1317 * maximum quantizer difference between frames
1318 * - encoding: Set by user.
1319 * - decoding: unused
1324 * maximum number of B-frames between non-B-frames
1325 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1326 * - encoding: Set by user.
1327 * - decoding: unused
1332 * qscale factor between IP and B-frames
1333 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1334 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1335 * - encoding: Set by user.
1336 * - decoding: unused
1338 float b_quant_factor;
1340 /** obsolete FIXME remove */
1342 #define FF_RC_STRATEGY_XVID 1
1344 int b_frame_strategy;
1346 struct AVCodec *codec;
1350 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1351 /* do its best to deliver a chunk with size */
1352 /* below rtp_payload_size, the chunk will start */
1353 /* with a start code on some codecs like H.263. */
1354 /* This doesn't take account of any particular */
1355 /* headers inside the transmitted RTP payload. */
1358 /* The RTP callback: This function is called */
1359 /* every time the encoder has a packet to send. */
1360 /* It depends on the encoder if the data starts */
1361 /* with a Start Code (it should). H.263 does. */
1362 /* mb_nb contains the number of macroblocks */
1363 /* encoded in the RTP payload. */
1364 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1366 /* statistics, used for 2-pass encoding */
1377 * number of bits used for the previously encoded frame
1378 * - encoding: Set by libavcodec.
1379 * - decoding: unused
1384 * Private data of the user, can be used to carry app specific stuff.
1385 * - encoding: Set by user.
1386 * - decoding: Set by user.
1390 char codec_name[32];
1391 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1392 enum CodecID codec_id; /* see CODEC_ID_xxx */
1395 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1396 * This is used to work around some encoder bugs.
1397 * A demuxer should set this to what is stored in the field used to identify the codec.
1398 * If there are multiple such fields in a container then the demuxer should choose the one
1399 * which maximizes the information about the used codec.
1400 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1401 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1402 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1404 * - encoding: Set by user, if not then the default based on codec_id will be used.
1405 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1407 unsigned int codec_tag;
1410 * Work around bugs in encoders which sometimes cannot be detected automatically.
1411 * - encoding: Set by user
1412 * - decoding: Set by user
1414 int workaround_bugs;
1415 #define FF_BUG_AUTODETECT 1 ///< autodetection
1416 #define FF_BUG_OLD_MSMPEG4 2
1417 #define FF_BUG_XVID_ILACE 4
1418 #define FF_BUG_UMP4 8
1419 #define FF_BUG_NO_PADDING 16
1420 #define FF_BUG_AMV 32
1421 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1422 #define FF_BUG_QPEL_CHROMA 64
1423 #define FF_BUG_STD_QPEL 128
1424 #define FF_BUG_QPEL_CHROMA2 256
1425 #define FF_BUG_DIRECT_BLOCKSIZE 512
1426 #define FF_BUG_EDGE 1024
1427 #define FF_BUG_HPEL_CHROMA 2048
1428 #define FF_BUG_DC_CLIP 4096
1429 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1430 #define FF_BUG_TRUNCATED 16384
1431 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1434 * luma single coefficient elimination threshold
1435 * - encoding: Set by user.
1436 * - decoding: unused
1438 int luma_elim_threshold;
1441 * chroma single coeff elimination threshold
1442 * - encoding: Set by user.
1443 * - decoding: unused
1445 int chroma_elim_threshold;
1448 * strictly follow the standard (MPEG4, ...).
1449 * - encoding: Set by user.
1450 * - decoding: Set by user.
1451 * Setting this to STRICT or higher means the encoder and decoder will
1452 * generally do stupid things, whereas setting it to unofficial or lower
1453 * will mean the encoder might produce output that is not supported by all
1454 * spec-compliant decoders. Decoders don't differentiate between normal,
1455 * unofficial and experimental (that is, they always try to decode things
1456 * when they can) unless they are explicitly asked to behave stupidly
1457 * (=strictly conform to the specs)
1459 int strict_std_compliance;
1460 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1461 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1462 #define FF_COMPLIANCE_NORMAL 0
1463 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1464 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1467 * qscale offset between IP and B-frames
1468 * - encoding: Set by user.
1469 * - decoding: unused
1471 float b_quant_offset;
1474 * Error recognition; higher values will detect more errors but may
1475 * misdetect some more or less valid parts as errors.
1476 * - encoding: unused
1477 * - decoding: Set by user.
1479 int error_recognition;
1480 #define FF_ER_CAREFUL 1
1481 #define FF_ER_COMPLIANT 2
1482 #define FF_ER_AGGRESSIVE 3
1483 #if FF_API_VERY_AGGRESSIVE
1484 #define FF_ER_VERY_AGGRESSIVE 4
1485 #define FF_ER_EXPLODE 5
1487 #define FF_ER_EXPLODE 4
1488 #endif /* FF_API_VERY_AGGRESSIVE */
1491 * Called at the beginning of each frame to get a buffer for it.
1492 * If pic.reference is set then the frame will be read later by libavcodec.
1493 * avcodec_align_dimensions2() should be used to find the required width and
1494 * height, as they normally need to be rounded up to the next multiple of 16.
1495 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1496 * avcodec_default_get_buffer() instead of providing buffers allocated by
1498 * If frame multithreading is used and thread_safe_callbacks is set,
1499 * it may be called from a different thread, but not from more than one at once.
1500 * Does not need to be reentrant.
1501 * - encoding: unused
1502 * - decoding: Set by libavcodec, user can override.
1504 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1507 * Called to release buffers which were allocated with get_buffer.
1508 * A released buffer can be reused in get_buffer().
1509 * pic.data[*] must be set to NULL.
1510 * May be called from a different thread if frame multithreading is used,
1511 * but not by more than one thread at once, so does not need to be reentrant.
1512 * - encoding: unused
1513 * - decoding: Set by libavcodec, user can override.
1515 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1518 * Size of the frame reordering buffer in the decoder.
1519 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1520 * - encoding: Set by libavcodec.
1521 * - decoding: Set by libavcodec.
1526 * number of bytes per packet if constant and known or 0
1527 * Used by some WAV based audio codecs.
1531 int parse_only; /* - decoding only: If true, only parsing is done
1532 (function avcodec_parse_frame()). The frame
1533 data is returned. Only MPEG codecs support this now. */
1536 * 0-> h263 quant 1-> mpeg quant
1537 * - encoding: Set by user.
1538 * - decoding: unused
1543 * pass1 encoding statistics output buffer
1544 * - encoding: Set by libavcodec.
1545 * - decoding: unused
1550 * pass2 encoding statistics input buffer
1551 * Concatenated stuff from stats_out of pass1 should be placed here.
1552 * - encoding: Allocated/set/freed by user.
1553 * - decoding: unused
1558 * ratecontrol qmin qmax limiting method
1559 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1560 * - encoding: Set by user.
1561 * - decoding: unused
1569 * ratecontrol override, see RcOverride
1570 * - encoding: Allocated/set/freed by user.
1571 * - decoding: unused
1573 RcOverride *rc_override;
1574 int rc_override_count;
1577 * rate control equation
1578 * - encoding: Set by user
1579 * - decoding: unused
1585 * - encoding: Set by user.
1586 * - decoding: unused
1592 * - encoding: Set by user.
1593 * - decoding: unused
1598 * decoder bitstream buffer size
1599 * - encoding: Set by user.
1600 * - decoding: unused
1603 float rc_buffer_aggressivity;
1606 * qscale factor between P and I-frames
1607 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1608 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1609 * - encoding: Set by user.
1610 * - decoding: unused
1612 float i_quant_factor;
1615 * qscale offset between P and I-frames
1616 * - encoding: Set by user.
1617 * - decoding: unused
1619 float i_quant_offset;
1622 * initial complexity for pass1 ratecontrol
1623 * - encoding: Set by user.
1624 * - decoding: unused
1626 float rc_initial_cplx;
1629 * DCT algorithm, see FF_DCT_* below
1630 * - encoding: Set by user.
1631 * - decoding: unused
1634 #define FF_DCT_AUTO 0
1635 #define FF_DCT_FASTINT 1
1636 #define FF_DCT_INT 2
1637 #define FF_DCT_MMX 3
1638 #define FF_DCT_MLIB 4
1639 #define FF_DCT_ALTIVEC 5
1640 #define FF_DCT_FAAN 6
1643 * luminance masking (0-> disabled)
1644 * - encoding: Set by user.
1645 * - decoding: unused
1650 * temporary complexity masking (0-> disabled)
1651 * - encoding: Set by user.
1652 * - decoding: unused
1654 float temporal_cplx_masking;
1657 * spatial complexity masking (0-> disabled)
1658 * - encoding: Set by user.
1659 * - decoding: unused
1661 float spatial_cplx_masking;
1664 * p block masking (0-> disabled)
1665 * - encoding: Set by user.
1666 * - decoding: unused
1671 * darkness masking (0-> disabled)
1672 * - encoding: Set by user.
1673 * - decoding: unused
1678 * IDCT algorithm, see FF_IDCT_* below.
1679 * - encoding: Set by user.
1680 * - decoding: Set by user.
1683 #define FF_IDCT_AUTO 0
1684 #define FF_IDCT_INT 1
1685 #define FF_IDCT_SIMPLE 2
1686 #define FF_IDCT_SIMPLEMMX 3
1687 #define FF_IDCT_LIBMPEG2MMX 4
1688 #define FF_IDCT_PS2 5
1689 #define FF_IDCT_MLIB 6
1690 #define FF_IDCT_ARM 7
1691 #define FF_IDCT_ALTIVEC 8
1692 #define FF_IDCT_SH4 9
1693 #define FF_IDCT_SIMPLEARM 10
1694 #define FF_IDCT_H264 11
1695 #define FF_IDCT_VP3 12
1696 #define FF_IDCT_IPP 13
1697 #define FF_IDCT_XVIDMMX 14
1698 #define FF_IDCT_CAVS 15
1699 #define FF_IDCT_SIMPLEARMV5TE 16
1700 #define FF_IDCT_SIMPLEARMV6 17
1701 #define FF_IDCT_SIMPLEVIS 18
1702 #define FF_IDCT_WMV2 19
1703 #define FF_IDCT_FAAN 20
1704 #define FF_IDCT_EA 21
1705 #define FF_IDCT_SIMPLENEON 22
1706 #define FF_IDCT_SIMPLEALPHA 23
1707 #define FF_IDCT_BINK 24
1711 * - encoding: Set by libavcodec.
1712 * - decoding: Set by user (or 0).
1716 * slice offsets in the frame in bytes
1717 * - encoding: Set/allocated by libavcodec.
1718 * - decoding: Set/allocated by user (or NULL).
1723 * error concealment flags
1724 * - encoding: unused
1725 * - decoding: Set by user.
1727 int error_concealment;
1728 #define FF_EC_GUESS_MVS 1
1729 #define FF_EC_DEBLOCK 2
1732 * dsp_mask could be add used to disable unwanted CPU features
1733 * CPU features (i.e. MMX, SSE. ...)
1735 * With the FORCE flag you may instead enable given CPU features.
1736 * (Dangerous: Usable in case of misdetection, improper usage however will
1737 * result into program crash.)
1742 * bits per sample/pixel from the demuxer (needed for huffyuv).
1743 * - encoding: Set by libavcodec.
1744 * - decoding: Set by user.
1746 int bits_per_coded_sample;
1749 * prediction method (needed for huffyuv)
1750 * - encoding: Set by user.
1751 * - decoding: unused
1753 int prediction_method;
1754 #define FF_PRED_LEFT 0
1755 #define FF_PRED_PLANE 1
1756 #define FF_PRED_MEDIAN 2
1759 * sample aspect ratio (0 if unknown)
1760 * That is the width of a pixel divided by the height of the pixel.
1761 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1762 * - encoding: Set by user.
1763 * - decoding: Set by libavcodec.
1765 AVRational sample_aspect_ratio;
1768 * the picture in the bitstream
1769 * - encoding: Set by libavcodec.
1770 * - decoding: Set by libavcodec.
1772 AVFrame *coded_frame;
1776 * - encoding: Set by user.
1777 * - decoding: Set by user.
1780 #define FF_DEBUG_PICT_INFO 1
1781 #define FF_DEBUG_RC 2
1782 #define FF_DEBUG_BITSTREAM 4
1783 #define FF_DEBUG_MB_TYPE 8
1784 #define FF_DEBUG_QP 16
1785 #define FF_DEBUG_MV 32
1786 #define FF_DEBUG_DCT_COEFF 0x00000040
1787 #define FF_DEBUG_SKIP 0x00000080
1788 #define FF_DEBUG_STARTCODE 0x00000100
1789 #define FF_DEBUG_PTS 0x00000200
1790 #define FF_DEBUG_ER 0x00000400
1791 #define FF_DEBUG_MMCO 0x00000800
1792 #define FF_DEBUG_BUGS 0x00001000
1793 #define FF_DEBUG_VIS_QP 0x00002000
1794 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1795 #define FF_DEBUG_BUFFERS 0x00008000
1796 #define FF_DEBUG_THREADS 0x00010000
1800 * - encoding: Set by user.
1801 * - decoding: Set by user.
1804 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1805 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1806 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1810 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1811 * - decoding: unused
1816 * motion estimation comparison function
1817 * - encoding: Set by user.
1818 * - decoding: unused
1822 * subpixel motion estimation comparison function
1823 * - encoding: Set by user.
1824 * - decoding: unused
1828 * macroblock comparison function (not supported yet)
1829 * - encoding: Set by user.
1830 * - decoding: unused
1834 * interlaced DCT comparison function
1835 * - encoding: Set by user.
1836 * - decoding: unused
1839 #define FF_CMP_SAD 0
1840 #define FF_CMP_SSE 1
1841 #define FF_CMP_SATD 2
1842 #define FF_CMP_DCT 3
1843 #define FF_CMP_PSNR 4
1844 #define FF_CMP_BIT 5
1846 #define FF_CMP_ZERO 7
1847 #define FF_CMP_VSAD 8
1848 #define FF_CMP_VSSE 9
1849 #define FF_CMP_NSSE 10
1850 #define FF_CMP_W53 11
1851 #define FF_CMP_W97 12
1852 #define FF_CMP_DCTMAX 13
1853 #define FF_CMP_DCT264 14
1854 #define FF_CMP_CHROMA 256
1857 * ME diamond size & shape
1858 * - encoding: Set by user.
1859 * - decoding: unused
1864 * amount of previous MV predictors (2a+1 x 2a+1 square)
1865 * - encoding: Set by user.
1866 * - decoding: unused
1868 int last_predictor_count;
1871 * prepass for motion estimation
1872 * - encoding: Set by user.
1873 * - decoding: unused
1878 * motion estimation prepass comparison function
1879 * - encoding: Set by user.
1880 * - decoding: unused
1885 * ME prepass diamond size & shape
1886 * - encoding: Set by user.
1887 * - decoding: unused
1893 * - encoding: Set by user.
1894 * - decoding: unused
1896 int me_subpel_quality;
1899 * callback to negotiate the pixelFormat
1900 * @param fmt is the list of formats which are supported by the codec,
1901 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1902 * The first is always the native one.
1903 * @return the chosen format
1904 * - encoding: unused
1905 * - decoding: Set by user, if not set the native format will be chosen.
1907 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1910 * DTG active format information (additional aspect ratio
1911 * information only used in DVB MPEG-2 transport streams)
1914 * - encoding: unused
1915 * - decoding: Set by decoder.
1917 int dtg_active_format;
1918 #define FF_DTG_AFD_SAME 8
1919 #define FF_DTG_AFD_4_3 9
1920 #define FF_DTG_AFD_16_9 10
1921 #define FF_DTG_AFD_14_9 11
1922 #define FF_DTG_AFD_4_3_SP_14_9 13
1923 #define FF_DTG_AFD_16_9_SP_14_9 14
1924 #define FF_DTG_AFD_SP_4_3 15
1927 * maximum motion estimation search range in subpel units
1928 * If 0 then no limit.
1930 * - encoding: Set by user.
1931 * - decoding: unused
1936 * intra quantizer bias
1937 * - encoding: Set by user.
1938 * - decoding: unused
1940 int intra_quant_bias;
1941 #define FF_DEFAULT_QUANT_BIAS 999999
1944 * inter quantizer bias
1945 * - encoding: Set by user.
1946 * - decoding: unused
1948 int inter_quant_bias;
1952 * - encoding: unused
1953 * - decoding: Which clrtable should be used for 8bit RGB images.
1954 * Tables have to be stored somewhere. FIXME
1959 * internal_buffer count
1960 * Don't touch, used by libavcodec default_get_buffer().
1962 int internal_buffer_count;
1966 * Don't touch, used by libavcodec default_get_buffer().
1968 void *internal_buffer;
1971 * Global quality for codecs which cannot change it per frame.
1972 * This should be proportional to MPEG-1/2/4 qscale.
1973 * - encoding: Set by user.
1974 * - decoding: unused
1978 #define FF_CODER_TYPE_VLC 0
1979 #define FF_CODER_TYPE_AC 1
1980 #define FF_CODER_TYPE_RAW 2
1981 #define FF_CODER_TYPE_RLE 3
1982 #define FF_CODER_TYPE_DEFLATE 4
1985 * - encoding: Set by user.
1986 * - decoding: unused
1992 * - encoding: Set by user.
1993 * - decoding: unused
1999 * - encoding: unused
2000 * - decoding: Set by user.
2002 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2007 * - encoding: unused
2008 * - decoding: Set by user.
2011 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2012 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2013 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2016 * XVideo Motion Acceleration
2017 * - encoding: forbidden
2018 * - decoding: set by decoder
2020 int xvmc_acceleration;
2023 * macroblock decision mode
2024 * - encoding: Set by user.
2025 * - decoding: unused
2028 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2029 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2030 #define FF_MB_DECISION_RD 2 ///< rate distortion
2033 * custom intra quantization matrix
2034 * - encoding: Set by user, can be NULL.
2035 * - decoding: Set by libavcodec.
2037 uint16_t *intra_matrix;
2040 * custom inter quantization matrix
2041 * - encoding: Set by user, can be NULL.
2042 * - decoding: Set by libavcodec.
2044 uint16_t *inter_matrix;
2047 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2048 * This is used to work around some encoder bugs.
2049 * - encoding: unused
2050 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2052 unsigned int stream_codec_tag;
2055 * scene change detection threshold
2056 * 0 is default, larger means fewer detected scene changes.
2057 * - encoding: Set by user.
2058 * - decoding: unused
2060 int scenechange_threshold;
2063 * minimum Lagrange multipler
2064 * - encoding: Set by user.
2065 * - decoding: unused
2070 * maximum Lagrange multipler
2071 * - encoding: Set by user.
2072 * - decoding: unused
2076 #if FF_API_PALETTE_CONTROL
2078 * palette control structure
2079 * - encoding: ??? (no palette-enabled encoder yet)
2080 * - decoding: Set by user.
2082 struct AVPaletteControl *palctrl;
2086 * noise reduction strength
2087 * - encoding: Set by user.
2088 * - decoding: unused
2090 int noise_reduction;
2093 * Called at the beginning of a frame to get cr buffer for it.
2094 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2095 * libavcodec will pass previous buffer in pic, function should return
2096 * same buffer or new buffer with old frame "painted" into it.
2097 * If pic.data[0] == NULL must behave like get_buffer().
2098 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2099 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2101 * - encoding: unused
2102 * - decoding: Set by libavcodec, user can override.
2104 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2107 * Number of bits which should be loaded into the rc buffer before decoding starts.
2108 * - encoding: Set by user.
2109 * - decoding: unused
2111 int rc_initial_buffer_occupancy;
2115 * - encoding: Set by user.
2116 * - decoding: unused
2118 int inter_threshold;
2122 * - encoding: Set by user.
2123 * - decoding: Set by user.
2128 * Simulates errors in the bitstream to test error concealment.
2129 * - encoding: Set by user.
2130 * - decoding: unused
2134 #if FF_API_ANTIALIAS_ALGO
2136 * MP3 antialias algorithm, see FF_AA_* below.
2137 * - encoding: unused
2138 * - decoding: Set by user.
2140 attribute_deprecated int antialias_algo;
2141 #define FF_AA_AUTO 0
2142 #define FF_AA_FASTINT 1 //not implemented yet
2144 #define FF_AA_FLOAT 3
2148 * quantizer noise shaping
2149 * - encoding: Set by user.
2150 * - decoding: unused
2152 int quantizer_noise_shaping;
2156 * is used to decide how many independent tasks should be passed to execute()
2157 * - encoding: Set by user.
2158 * - decoding: Set by user.
2163 * The codec may call this to execute several independent things.
2164 * It will return only after finishing all tasks.
2165 * The user may replace this with some multithreaded implementation,
2166 * the default implementation will execute the parts serially.
2167 * @param count the number of things to execute
2168 * - encoding: Set by libavcodec, user can override.
2169 * - decoding: Set by libavcodec, user can override.
2171 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2175 * Can be used by execute() to store some per AVCodecContext stuff.
2176 * - encoding: set by execute()
2177 * - decoding: set by execute()
2179 void *thread_opaque;
2182 * Motion estimation threshold below which no motion estimation is
2183 * performed, but instead the user specified motion vectors are used.
2185 * - encoding: Set by user.
2186 * - decoding: unused
2191 * Macroblock threshold below which the user specified macroblock types will be used.
2192 * - encoding: Set by user.
2193 * - decoding: unused
2198 * precision of the intra DC coefficient - 8
2199 * - encoding: Set by user.
2200 * - decoding: unused
2202 int intra_dc_precision;
2205 * noise vs. sse weight for the nsse comparsion function
2206 * - encoding: Set by user.
2207 * - decoding: unused
2212 * Number of macroblock rows at the top which are skipped.
2213 * - encoding: unused
2214 * - decoding: Set by user.
2219 * Number of macroblock rows at the bottom which are skipped.
2220 * - encoding: unused
2221 * - decoding: Set by user.
2227 * - encoding: Set by user.
2228 * - decoding: Set by libavcodec.
2231 #define FF_PROFILE_UNKNOWN -99
2232 #define FF_PROFILE_RESERVED -100
2234 #define FF_PROFILE_AAC_MAIN 0
2235 #define FF_PROFILE_AAC_LOW 1
2236 #define FF_PROFILE_AAC_SSR 2
2237 #define FF_PROFILE_AAC_LTP 3
2239 #define FF_PROFILE_DTS 20
2240 #define FF_PROFILE_DTS_ES 30
2241 #define FF_PROFILE_DTS_96_24 40
2242 #define FF_PROFILE_DTS_HD_HRA 50
2243 #define FF_PROFILE_DTS_HD_MA 60
2245 #define FF_PROFILE_MPEG2_422 0
2246 #define FF_PROFILE_MPEG2_HIGH 1
2247 #define FF_PROFILE_MPEG2_SS 2
2248 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2249 #define FF_PROFILE_MPEG2_MAIN 4
2250 #define FF_PROFILE_MPEG2_SIMPLE 5
2252 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2253 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2255 #define FF_PROFILE_H264_BASELINE 66
2256 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2257 #define FF_PROFILE_H264_MAIN 77
2258 #define FF_PROFILE_H264_EXTENDED 88
2259 #define FF_PROFILE_H264_HIGH 100
2260 #define FF_PROFILE_H264_HIGH_10 110
2261 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2262 #define FF_PROFILE_H264_HIGH_422 122
2263 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2264 #define FF_PROFILE_H264_HIGH_444 144
2265 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2266 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2267 #define FF_PROFILE_H264_CAVLC_444 44
2269 #define FF_PROFILE_VC1_SIMPLE 0
2270 #define FF_PROFILE_VC1_MAIN 1
2271 #define FF_PROFILE_VC1_COMPLEX 2
2272 #define FF_PROFILE_VC1_ADVANCED 3
2274 #define FF_PROFILE_MPEG4_SIMPLE 0
2275 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2276 #define FF_PROFILE_MPEG4_CORE 2
2277 #define FF_PROFILE_MPEG4_MAIN 3
2278 #define FF_PROFILE_MPEG4_N_BIT 4
2279 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2280 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2281 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2282 #define FF_PROFILE_MPEG4_HYBRID 8
2283 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2284 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2285 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2286 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2287 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2288 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2289 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2293 * - encoding: Set by user.
2294 * - decoding: Set by libavcodec.
2297 #define FF_LEVEL_UNKNOWN -99
2300 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2301 * - encoding: unused
2302 * - decoding: Set by user.
2307 * Bitstream width / height, may be different from width/height if lowres enabled.
2308 * - encoding: unused
2309 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2311 int coded_width, coded_height;
2314 * frame skip threshold
2315 * - encoding: Set by user.
2316 * - decoding: unused
2318 int frame_skip_threshold;
2322 * - encoding: Set by user.
2323 * - decoding: unused
2325 int frame_skip_factor;
2328 * frame skip exponent
2329 * - encoding: Set by user.
2330 * - decoding: unused
2335 * frame skip comparison function
2336 * - encoding: Set by user.
2337 * - decoding: unused
2342 * Border processing masking, raises the quantizer for mbs on the borders
2344 * - encoding: Set by user.
2345 * - decoding: unused
2347 float border_masking;
2350 * minimum MB lagrange multipler
2351 * - encoding: Set by user.
2352 * - decoding: unused
2357 * maximum MB lagrange multipler
2358 * - encoding: Set by user.
2359 * - decoding: unused
2365 * - encoding: Set by user.
2366 * - decoding: unused
2368 int me_penalty_compensation;
2372 * - encoding: unused
2373 * - decoding: Set by user.
2375 enum AVDiscard skip_loop_filter;
2379 * - encoding: unused
2380 * - decoding: Set by user.
2382 enum AVDiscard skip_idct;
2386 * - encoding: unused
2387 * - decoding: Set by user.
2389 enum AVDiscard skip_frame;
2393 * - encoding: Set by user.
2394 * - decoding: unused
2400 * - encoding: Set by user.
2401 * - decoding: unused
2405 #if FF_API_X264_GLOBAL_OPTS
2407 * constant rate factor - quality-based VBR - values ~correspond to qps
2408 * - encoding: Set by user.
2409 * - decoding: unused
2410 * @deprecated use 'crf' libx264 private option
2412 attribute_deprecated float crf;
2415 * constant quantization parameter rate control method
2416 * - encoding: Set by user.
2417 * - decoding: unused
2418 * @deprecated use 'cqp' libx264 private option
2420 attribute_deprecated int cqp;
2425 * - encoding: Set by user.
2426 * - decoding: unused
2431 * number of reference frames
2432 * - encoding: Set by user.
2433 * - decoding: Set by lavc.
2438 * chroma qp offset from luma
2439 * - encoding: Set by user.
2440 * - decoding: unused
2445 * Influences how often B-frames are used.
2446 * - encoding: Set by user.
2447 * - decoding: unused
2452 * trellis RD quantization
2453 * - encoding: Set by user.
2454 * - decoding: unused
2459 * Reduce fluctuations in qp (before curve compression).
2460 * - encoding: Set by user.
2461 * - decoding: unused
2463 float complexityblur;
2466 * in-loop deblocking filter alphac0 parameter
2467 * alpha is in the range -6...6
2468 * - encoding: Set by user.
2469 * - decoding: unused
2474 * in-loop deblocking filter beta parameter
2475 * beta is in the range -6...6
2476 * - encoding: Set by user.
2477 * - decoding: unused
2482 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2483 * - encoding: Set by user.
2484 * - decoding: unused
2487 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2488 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2489 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2490 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2491 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2494 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2495 * - encoding: Set by user.
2496 * - decoding: unused
2501 * Audio cutoff bandwidth (0 means "automatic")
2502 * - encoding: Set by user.
2503 * - decoding: unused
2508 * Multiplied by qscale for each frame and added to scene_change_score.
2509 * - encoding: Set by user.
2510 * - decoding: unused
2512 int scenechange_factor;
2516 * Note: Value depends upon the compare function used for fullpel ME.
2517 * - encoding: Set by user.
2518 * - decoding: unused
2523 * Adjusts sensitivity of b_frame_strategy 1.
2524 * - encoding: Set by user.
2525 * - decoding: unused
2530 * - encoding: Set by user.
2531 * - decoding: unused
2533 int compression_level;
2534 #define FF_COMPRESSION_DEFAULT -1
2537 * - encoding: Set by user.
2538 * - decoding: unused
2540 int min_prediction_order;
2543 * - encoding: Set by user.
2544 * - decoding: unused
2546 int max_prediction_order;
2548 #if FF_API_FLAC_GLOBAL_OPTS
2550 * @name FLAC options
2551 * @deprecated Use FLAC encoder private options instead.
2556 * LPC coefficient precision - used by FLAC encoder
2557 * - encoding: Set by user.
2558 * - decoding: unused
2560 attribute_deprecated int lpc_coeff_precision;
2563 * search method for selecting prediction order
2564 * - encoding: Set by user.
2565 * - decoding: unused
2567 attribute_deprecated int prediction_order_method;
2570 * - encoding: Set by user.
2571 * - decoding: unused
2573 attribute_deprecated int min_partition_order;
2576 * - encoding: Set by user.
2577 * - decoding: unused
2579 attribute_deprecated int max_partition_order;
2586 * GOP timecode frame start number, in non drop frame format
2587 * - encoding: Set by user.
2588 * - decoding: unused
2590 int64_t timecode_frame_start;
2592 #if FF_API_REQUEST_CHANNELS
2594 * Decoder should decode to this many channels if it can (0 for default)
2595 * - encoding: unused
2596 * - decoding: Set by user.
2597 * @deprecated Deprecated in favor of request_channel_layout.
2599 int request_channels;
2602 #if FF_API_DRC_SCALE
2604 * Percentage of dynamic range compression to be applied by the decoder.
2605 * The default value is 1.0, corresponding to full compression.
2606 * - encoding: unused
2607 * - decoding: Set by user.
2608 * @deprecated use AC3 decoder private option instead.
2610 attribute_deprecated float drc_scale;
2614 * opaque 64bit number (generally a PTS) that will be reordered and
2615 * output in AVFrame.reordered_opaque
2616 * @deprecated in favor of pkt_pts
2617 * - encoding: unused
2618 * - decoding: Set by user.
2620 int64_t reordered_opaque;
2623 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2624 * - encoding: set by user.
2625 * - decoding: set by libavcodec.
2627 int bits_per_raw_sample;
2630 * Audio channel layout.
2631 * - encoding: set by user.
2632 * - decoding: set by libavcodec.
2634 int64_t channel_layout;
2637 * Request decoder to use this channel layout if it can (0 for default)
2638 * - encoding: unused
2639 * - decoding: Set by user.
2641 int64_t request_channel_layout;
2644 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2645 * - encoding: Set by user.
2646 * - decoding: unused.
2648 float rc_max_available_vbv_use;
2651 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2652 * - encoding: Set by user.
2653 * - decoding: unused.
2655 float rc_min_vbv_overflow_use;
2658 * Hardware accelerator in use
2659 * - encoding: unused.
2660 * - decoding: Set by libavcodec
2662 struct AVHWAccel *hwaccel;
2665 * For some codecs, the time base is closer to the field rate than the frame rate.
2666 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2667 * if no telecine is used ...
2669 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2671 int ticks_per_frame;
2674 * Hardware accelerator context.
2675 * For some hardware accelerators, a global context needs to be
2676 * provided by the user. In that case, this holds display-dependent
2677 * data Libav cannot instantiate itself. Please refer to the
2678 * Libav HW accelerator documentation to know how to fill this
2679 * is. e.g. for VA API, this is a struct vaapi_context.
2680 * - encoding: unused
2681 * - decoding: Set by user
2683 void *hwaccel_context;
2686 * Chromaticity coordinates of the source primaries.
2687 * - encoding: Set by user
2688 * - decoding: Set by libavcodec
2690 enum AVColorPrimaries color_primaries;
2693 * Color Transfer Characteristic.
2694 * - encoding: Set by user
2695 * - decoding: Set by libavcodec
2697 enum AVColorTransferCharacteristic color_trc;
2700 * YUV colorspace type.
2701 * - encoding: Set by user
2702 * - decoding: Set by libavcodec
2704 enum AVColorSpace colorspace;
2707 * MPEG vs JPEG YUV range.
2708 * - encoding: Set by user
2709 * - decoding: Set by libavcodec
2711 enum AVColorRange color_range;
2714 * This defines the location of chroma samples.
2715 * - encoding: Set by user
2716 * - decoding: Set by libavcodec
2718 enum AVChromaLocation chroma_sample_location;
2721 * The codec may call this to execute several independent things.
2722 * It will return only after finishing all tasks.
2723 * The user may replace this with some multithreaded implementation,
2724 * the default implementation will execute the parts serially.
2725 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2726 * @param c context passed also to func
2727 * @param count the number of things to execute
2728 * @param arg2 argument passed unchanged to func
2729 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2730 * @param func function that will be called count times, with jobnr from 0 to count-1.
2731 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2732 * two instances of func executing at the same time will have the same threadnr.
2733 * @return always 0 currently, but code should handle a future improvement where when any call to func
2734 * returns < 0 no further calls to func may be done and < 0 is returned.
2735 * - encoding: Set by libavcodec, user can override.
2736 * - decoding: Set by libavcodec, user can override.
2738 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2740 #if FF_API_X264_GLOBAL_OPTS
2742 * explicit P-frame weighted prediction analysis method
2744 * 1: fast blind weighting (one reference duplicate with -1 offset)
2745 * 2: smart weighting (full fade detection analysis)
2746 * - encoding: Set by user.
2747 * - decoding: unused
2749 attribute_deprecated int weighted_p_pred;
2754 * 1: Variance AQ (complexity mask)
2755 * 2: Auto-variance AQ (experimental)
2756 * - encoding: Set by user
2757 * - decoding: unused
2759 attribute_deprecated int aq_mode;
2763 * Reduces blocking and blurring in flat and textured areas.
2764 * - encoding: Set by user
2765 * - decoding: unused
2767 attribute_deprecated float aq_strength;
2771 * Strength of psychovisual optimization
2772 * - encoding: Set by user
2773 * - decoding: unused
2775 attribute_deprecated float psy_rd;
2779 * Strength of psychovisual optimization
2780 * - encoding: Set by user
2781 * - decoding: unused
2783 attribute_deprecated float psy_trellis;
2787 * Number of frames for frametype and ratecontrol lookahead
2788 * - encoding: Set by user
2789 * - decoding: unused
2791 attribute_deprecated int rc_lookahead;
2794 * Constant rate factor maximum
2795 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2796 * than crf_max, even if doing so would violate VBV restrictions.
2797 * - encoding: Set by user.
2798 * - decoding: unused
2800 attribute_deprecated float crf_max;
2803 int log_level_offset;
2805 #if FF_API_FLAC_GLOBAL_OPTS
2807 * Determines which LPC analysis algorithm to use.
2808 * - encoding: Set by user
2809 * - decoding: unused
2811 attribute_deprecated enum AVLPCType lpc_type;
2814 * Number of passes to use for Cholesky factorization during LPC analysis
2815 * - encoding: Set by user
2816 * - decoding: unused
2818 attribute_deprecated int lpc_passes;
2823 * Indicates number of picture subdivisions. Used for parallelized
2825 * - encoding: Set by user
2826 * - decoding: unused
2831 * Header containing style information for text subtitles.
2832 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2833 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2834 * the Format line following. It shouldn't include any Dialogue line.
2835 * - encoding: Set/allocated/freed by user (before avcodec_open())
2836 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2838 uint8_t *subtitle_header;
2839 int subtitle_header_size;
2842 * Current packet as passed into the decoder, to avoid having
2843 * to pass the packet into every function. Currently only valid
2844 * inside lavc and get/release_buffer callbacks.
2845 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2846 * - encoding: unused
2851 * Whether this is a copy of the context which had init() called on it.
2852 * This is used by multithreading - shared tables and picture pointers
2853 * should be freed from the original context only.
2854 * - encoding: Set by libavcodec.
2855 * - decoding: Set by libavcodec.
2860 * Which multithreading methods to use.
2861 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2862 * so clients which cannot provide future frames should not use it.
2864 * - encoding: Set by user, otherwise the default is used.
2865 * - decoding: Set by user, otherwise the default is used.
2868 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2869 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2872 * Which multithreading methods are in use by the codec.
2873 * - encoding: Set by libavcodec.
2874 * - decoding: Set by libavcodec.
2876 int active_thread_type;
2879 * Set by the client if its custom get_buffer() callback can be called
2880 * from another thread, which allows faster multithreaded decoding.
2881 * draw_horiz_band() will be called from other threads regardless of this setting.
2882 * Ignored if the default get_buffer() is used.
2883 * - encoding: Set by user.
2884 * - decoding: Set by user.
2886 int thread_safe_callbacks;
2889 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2890 * Used for compliant TS muxing.
2891 * - encoding: Set by libavcodec.
2892 * - decoding: unused.
2897 * Type of service that the audio stream conveys.
2898 * - encoding: Set by user.
2899 * - decoding: Set by libavcodec.
2901 enum AVAudioServiceType audio_service_type;
2904 * Used to request a sample format from the decoder.
2905 * - encoding: unused.
2906 * - decoding: Set by user.
2908 enum AVSampleFormat request_sample_fmt;
2914 typedef struct AVProfile {
2916 const char *name; ///< short name for the profile
2919 typedef struct AVCodecDefault AVCodecDefault;
2924 typedef struct AVCodec {
2926 * Name of the codec implementation.
2927 * The name is globally unique among encoders and among decoders (but an
2928 * encoder and a decoder can share the same name).
2929 * This is the primary way to find a codec from the user perspective.
2932 enum AVMediaType type;
2935 int (*init)(AVCodecContext *);
2936 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2937 int (*close)(AVCodecContext *);
2938 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2940 * Codec capabilities.
2944 struct AVCodec *next;
2947 * Will be called when seeking
2949 void (*flush)(AVCodecContext *);
2950 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2951 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2953 * Descriptive name for the codec, meant to be more human readable than name.
2954 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2956 const char *long_name;
2957 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2958 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2959 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2960 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2961 const AVClass *priv_class; ///< AVClass for the private context
2962 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2965 * @name Frame-level threading support functions
2969 * If defined, called on thread contexts when they are created.
2970 * If the codec allocates writable tables in init(), re-allocate them here.
2971 * priv_data will be set to a copy of the original.
2973 int (*init_thread_copy)(AVCodecContext *);
2975 * Copy necessary context variables from a previous thread context to the current one.
2976 * If not defined, the next thread will start automatically; otherwise, the codec
2977 * must call ff_thread_finish_setup().
2979 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2981 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2985 * Private codec-specific defaults.
2987 const AVCodecDefault *defaults;
2993 typedef struct AVHWAccel {
2995 * Name of the hardware accelerated codec.
2996 * The name is globally unique among encoders and among decoders (but an
2997 * encoder and a decoder can share the same name).
3002 * Type of codec implemented by the hardware accelerator.
3004 * See AVMEDIA_TYPE_xxx
3006 enum AVMediaType type;
3009 * Codec implemented by the hardware accelerator.
3016 * Supported pixel format.
3018 * Only hardware accelerated formats are supported here.
3020 enum PixelFormat pix_fmt;
3023 * Hardware accelerated codec capabilities.
3024 * see FF_HWACCEL_CODEC_CAP_*
3028 struct AVHWAccel *next;
3031 * Called at the beginning of each frame or field picture.
3033 * Meaningful frame information (codec specific) is guaranteed to
3034 * be parsed at this point. This function is mandatory.
3036 * Note that buf can be NULL along with buf_size set to 0.
3037 * Otherwise, this means the whole frame is available at this point.
3039 * @param avctx the codec context
3040 * @param buf the frame data buffer base
3041 * @param buf_size the size of the frame in bytes
3042 * @return zero if successful, a negative value otherwise
3044 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3047 * Callback for each slice.
3049 * Meaningful slice information (codec specific) is guaranteed to
3050 * be parsed at this point. This function is mandatory.
3052 * @param avctx the codec context
3053 * @param buf the slice data buffer base
3054 * @param buf_size the size of the slice in bytes
3055 * @return zero if successful, a negative value otherwise
3057 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3060 * Called at the end of each frame or field picture.
3062 * The whole picture is parsed at this point and can now be sent
3063 * to the hardware accelerator. This function is mandatory.
3065 * @param avctx the codec context
3066 * @return zero if successful, a negative value otherwise
3068 int (*end_frame)(AVCodecContext *avctx);
3071 * Size of HW accelerator private data.
3073 * Private data is allocated with av_mallocz() before
3074 * AVCodecContext.get_buffer() and deallocated after
3075 * AVCodecContext.release_buffer().
3081 * four components are given, that's all.
3082 * the last component is alpha
3084 typedef struct AVPicture {
3086 int linesize[4]; ///< number of bytes per line
3089 #if FF_API_PALETTE_CONTROL
3092 * This structure defines a method for communicating palette changes
3093 * between and demuxer and a decoder.
3095 * @deprecated Use AVPacket to send palette changes instead.
3096 * This is totally broken.
3098 #define AVPALETTE_SIZE 1024
3099 #define AVPALETTE_COUNT 256
3100 typedef struct AVPaletteControl {
3102 /* Demuxer sets this to 1 to indicate the palette has changed;
3103 * decoder resets to 0. */
3104 int palette_changed;
3106 /* 4-byte ARGB palette entries, stored in native byte order; note that
3107 * the individual palette components should be on a 8-bit scale; if
3108 * the palette data comes from an IBM VGA native format, the component
3109 * data is probably 6 bits in size and needs to be scaled. */
3110 unsigned int palette[AVPALETTE_COUNT];
3112 } AVPaletteControl attribute_deprecated;
3115 enum AVSubtitleType {
3118 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3121 * Plain text, the text field must be set by the decoder and is
3122 * authoritative. ass and pict fields may contain approximations.
3127 * Formatted text, the ass field must be set by the decoder and is
3128 * authoritative. pict and text fields may contain approximations.
3133 typedef struct AVSubtitleRect {
3134 int x; ///< top left corner of pict, undefined when pict is not set
3135 int y; ///< top left corner of pict, undefined when pict is not set
3136 int w; ///< width of pict, undefined when pict is not set
3137 int h; ///< height of pict, undefined when pict is not set
3138 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3141 * data+linesize for the bitmap of this subtitle.
3142 * can be set for text/ass as well once they where rendered
3145 enum AVSubtitleType type;
3147 char *text; ///< 0 terminated plain UTF-8 text
3150 * 0 terminated ASS/SSA compatible event line.
3151 * The pressentation of this is unaffected by the other values in this
3157 typedef struct AVSubtitle {
3158 uint16_t format; /* 0 = graphics */
3159 uint32_t start_display_time; /* relative to packet pts, in ms */
3160 uint32_t end_display_time; /* relative to packet pts, in ms */
3162 AVSubtitleRect **rects;
3163 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3166 /* packet functions */
3169 * @deprecated use NULL instead
3171 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3174 * Default packet destructor.
3176 void av_destruct_packet(AVPacket *pkt);
3179 * Initialize optional fields of a packet with default values.
3183 void av_init_packet(AVPacket *pkt);
3186 * Allocate the payload of a packet and initialize its fields with
3190 * @param size wanted payload size
3191 * @return 0 if OK, AVERROR_xxx otherwise
3193 int av_new_packet(AVPacket *pkt, int size);
3196 * Reduce packet size, correctly zeroing padding
3199 * @param size new size
3201 void av_shrink_packet(AVPacket *pkt, int size);
3204 * Increase packet size, correctly zeroing padding
3207 * @param grow_by number of bytes by which to increase the size of the packet
3209 int av_grow_packet(AVPacket *pkt, int grow_by);
3212 * @warning This is a hack - the packet memory allocation stuff is broken. The
3213 * packet is allocated if it was not really allocated.
3215 int av_dup_packet(AVPacket *pkt);
3220 * @param pkt packet to free
3222 void av_free_packet(AVPacket *pkt);
3225 * Allocate new information of a packet.
3228 * @param type side information type
3229 * @param size side information size
3230 * @return pointer to fresh allocated data or NULL otherwise
3232 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3236 * Get side information from packet.
3239 * @param type desired side information type
3240 * @param size pointer for side information size to store (optional)
3241 * @return pointer to data if present or NULL otherwise
3243 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3248 struct ReSampleContext;
3249 struct AVResampleContext;
3251 typedef struct ReSampleContext ReSampleContext;
3254 * Initialize audio resampling context.
3256 * @param output_channels number of output channels
3257 * @param input_channels number of input channels
3258 * @param output_rate output sample rate
3259 * @param input_rate input sample rate
3260 * @param sample_fmt_out requested output sample format
3261 * @param sample_fmt_in input sample format
3262 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3263 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3264 * @param linear if 1 then the used FIR filter will be linearly interpolated
3265 between the 2 closest, if 0 the closest will be used
3266 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3267 * @return allocated ReSampleContext, NULL if error occured
3269 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3270 int output_rate, int input_rate,
3271 enum AVSampleFormat sample_fmt_out,
3272 enum AVSampleFormat sample_fmt_in,
3273 int filter_length, int log2_phase_count,
3274 int linear, double cutoff);
3276 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3279 * Free resample context.
3281 * @param s a non-NULL pointer to a resample context previously
3282 * created with av_audio_resample_init()
3284 void audio_resample_close(ReSampleContext *s);
3288 * Initialize an audio resampler.
3289 * Note, if either rate is not an integer then simply scale both rates up so they are.
3290 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3291 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3292 * @param linear If 1 then the used FIR filter will be linearly interpolated
3293 between the 2 closest, if 0 the closest will be used
3294 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3296 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3299 * Resample an array of samples using a previously configured context.
3300 * @param src an array of unconsumed samples
3301 * @param consumed the number of samples of src which have been consumed are returned here
3302 * @param src_size the number of unconsumed samples available
3303 * @param dst_size the amount of space in samples available in dst
3304 * @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.
3305 * @return the number of samples written in dst or -1 if an error occurred
3307 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3311 * Compensate samplerate/timestamp drift. The compensation is done by changing
3312 * the resampler parameters, so no audible clicks or similar distortions occur
3313 * @param compensation_distance distance in output samples over which the compensation should be performed
3314 * @param sample_delta number of output samples which should be output less
3316 * example: av_resample_compensate(c, 10, 500)
3317 * here instead of 510 samples only 500 samples would be output
3319 * note, due to rounding the actual compensation might be slightly different,
3320 * especially if the compensation_distance is large and the in_rate used during init is small
3322 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3323 void av_resample_close(struct AVResampleContext *c);
3326 * Allocate memory for a picture. Call avpicture_free() to free it.
3328 * @see avpicture_fill()
3330 * @param picture the picture to be filled in
3331 * @param pix_fmt the format of the picture
3332 * @param width the width of the picture
3333 * @param height the height of the picture
3334 * @return zero if successful, a negative value if not
3336 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3339 * Free a picture previously allocated by avpicture_alloc().
3340 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3343 * @param picture the AVPicture to be freed
3345 void avpicture_free(AVPicture *picture);
3348 * Fill in the AVPicture fields.
3349 * The fields of the given AVPicture are filled in by using the 'ptr' address
3350 * which points to the image data buffer. Depending on the specified picture
3351 * format, one or multiple image data pointers and line sizes will be set.
3352 * If a planar format is specified, several pointers will be set pointing to
3353 * the different picture planes and the line sizes of the different planes
3354 * will be stored in the lines_sizes array.
3355 * Call with ptr == NULL to get the required size for the ptr buffer.
3357 * To allocate the buffer and fill in the AVPicture fields in one call,
3358 * use avpicture_alloc().
3360 * @param picture AVPicture whose fields are to be filled in
3361 * @param ptr Buffer which will contain or contains the actual image data
3362 * @param pix_fmt The format in which the picture data is stored.
3363 * @param width the width of the image in pixels
3364 * @param height the height of the image in pixels
3365 * @return size of the image data in bytes
3367 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3368 enum PixelFormat pix_fmt, int width, int height);
3371 * Copy pixel data from an AVPicture into a buffer.
3372 * The data is stored compactly, without any gaps for alignment or padding
3373 * which may be applied by avpicture_fill().
3375 * @see avpicture_get_size()
3377 * @param[in] src AVPicture containing image data
3378 * @param[in] pix_fmt The format in which the picture data is stored.
3379 * @param[in] width the width of the image in pixels.
3380 * @param[in] height the height of the image in pixels.
3381 * @param[out] dest A buffer into which picture data will be copied.
3382 * @param[in] dest_size The size of 'dest'.
3383 * @return The number of bytes written to dest, or a negative value (error code) on error.
3385 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3386 unsigned char *dest, int dest_size);
3389 * Calculate the size in bytes that a picture of the given width and height
3390 * would occupy if stored in the given picture format.
3391 * Note that this returns the size of a compact representation as generated
3392 * by avpicture_layout(), which can be smaller than the size required for e.g.
3395 * @param pix_fmt the given picture format
3396 * @param width the width of the image
3397 * @param height the height of the image
3398 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3400 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3401 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3403 #if FF_API_GET_PIX_FMT_NAME
3405 * @deprecated Deprecated in favor of av_get_pix_fmt_name().
3407 attribute_deprecated
3408 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3411 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3414 * Return a value representing the fourCC code associated to the
3415 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3418 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3421 * Put a string representing the codec tag codec_tag in buf.
3423 * @param buf_size size in bytes of buf
3424 * @return the length of the string that would have been generated if
3425 * enough space had been available, excluding the trailing null
3427 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3429 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3430 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3431 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3432 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3433 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3434 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3437 * Compute what kind of losses will occur when converting from one specific
3438 * pixel format to another.
3439 * When converting from one pixel format to another, information loss may occur.
3440 * For example, when converting from RGB24 to GRAY, the color information will
3441 * be lost. Similarly, other losses occur when converting from some formats to
3442 * other formats. These losses can involve loss of chroma, but also loss of
3443 * resolution, loss of color depth, loss due to the color space conversion, loss
3444 * of the alpha bits or loss due to color quantization.
3445 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3446 * which will occur when converting from one pixel format to another.
3448 * @param[in] dst_pix_fmt destination pixel format
3449 * @param[in] src_pix_fmt source pixel format
3450 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3451 * @return Combination of flags informing you what kind of losses will occur.
3453 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3457 * Find the best pixel format to convert to given a certain source pixel
3458 * format. When converting from one pixel format to another, information loss
3459 * may occur. For example, when converting from RGB24 to GRAY, the color
3460 * information will be lost. Similarly, other losses occur when converting from
3461 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3462 * the given pixel formats should be used to suffer the least amount of loss.
3463 * The pixel formats from which it chooses one, are determined by the
3464 * pix_fmt_mask parameter.
3467 * src_pix_fmt = PIX_FMT_YUV420P;
3468 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3469 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3472 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3473 * @param[in] src_pix_fmt source pixel format
3474 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3475 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3476 * @return The best pixel format to convert to or -1 if none was found.
3478 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3479 int has_alpha, int *loss_ptr);
3481 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3482 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3485 * Tell if an image really has transparent alpha values.
3486 * @return ored mask of FF_ALPHA_xxx constants
3488 int img_get_alpha_info(const AVPicture *src,
3489 enum PixelFormat pix_fmt, int width, int height);
3491 /* deinterlace a picture */
3492 /* deinterlace - if not supported return -1 */
3493 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3494 enum PixelFormat pix_fmt, int width, int height);
3496 /* external high level API */
3499 * If c is NULL, returns the first registered codec,
3500 * if c is non-NULL, returns the next registered codec after c,
3501 * or NULL if c is the last one.
3503 AVCodec *av_codec_next(AVCodec *c);
3506 * Return the LIBAVCODEC_VERSION_INT constant.
3508 unsigned avcodec_version(void);
3511 * Return the libavcodec build-time configuration.
3513 const char *avcodec_configuration(void);
3516 * Return the libavcodec license.
3518 const char *avcodec_license(void);
3520 #if FF_API_AVCODEC_INIT
3522 * @deprecated this function is called automatically from avcodec_register()
3523 * and avcodec_register_all(), there is no need to call it manually
3525 attribute_deprecated
3526 void avcodec_init(void);
3530 * Register the codec codec and initialize libavcodec.
3532 * @warning either this function or avcodec_register_all() must be called
3533 * before any other libavcodec functions.
3535 * @see avcodec_register_all()
3537 void avcodec_register(AVCodec *codec);
3540 * Find a registered encoder with a matching codec ID.
3542 * @param id CodecID of the requested encoder
3543 * @return An encoder if one was found, NULL otherwise.
3545 AVCodec *avcodec_find_encoder(enum CodecID id);
3548 * Find a registered encoder with the specified name.
3550 * @param name name of the requested encoder
3551 * @return An encoder if one was found, NULL otherwise.
3553 AVCodec *avcodec_find_encoder_by_name(const char *name);
3556 * Find a registered decoder with a matching codec ID.
3558 * @param id CodecID of the requested decoder
3559 * @return A decoder if one was found, NULL otherwise.
3561 AVCodec *avcodec_find_decoder(enum CodecID id);
3564 * Find a registered decoder with the specified name.
3566 * @param name name of the requested decoder
3567 * @return A decoder if one was found, NULL otherwise.
3569 AVCodec *avcodec_find_decoder_by_name(const char *name);
3570 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3573 * Return a name for the specified profile, if available.
3575 * @param codec the codec that is searched for the given profile
3576 * @param profile the profile value for which a name is requested
3577 * @return A name for the profile if found, NULL otherwise.
3579 const char *av_get_profile_name(const AVCodec *codec, int profile);
3582 * Set the fields of the given AVCodecContext to default values.
3584 * @param s The AVCodecContext of which the fields should be set to default values.
3586 void avcodec_get_context_defaults(AVCodecContext *s);
3588 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3589 * we WILL change its arguments and name a few times! */
3590 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3592 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3593 * we WILL change its arguments and name a few times! */
3594 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3596 #if FF_API_ALLOC_CONTEXT
3598 * Allocate an AVCodecContext and set its fields to default values. The
3599 * resulting struct can be deallocated by simply calling av_free().
3601 * @return An AVCodecContext filled with default values or NULL on failure.
3602 * @see avcodec_get_context_defaults
3604 * @deprecated use avcodec_alloc_context3()
3606 attribute_deprecated
3607 AVCodecContext *avcodec_alloc_context(void);
3609 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3610 * we WILL change its arguments and name a few times! */
3611 attribute_deprecated
3612 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3616 * Allocate an AVCodecContext and set its fields to default values. The
3617 * resulting struct can be deallocated by simply calling av_free().
3619 * @param codec if non-NULL, allocate private data and initialize defaults
3620 * for the given codec. It is illegal to then call avcodec_open()
3621 * with a different codec.
3623 * @return An AVCodecContext filled with default values or NULL on failure.
3624 * @see avcodec_get_context_defaults
3626 * @deprecated use avcodec_alloc_context3()
3628 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3631 * Copy the settings of the source AVCodecContext into the destination
3632 * AVCodecContext. The resulting destination codec context will be
3633 * unopened, i.e. you are required to call avcodec_open() before you
3634 * can use this AVCodecContext to decode/encode video/audio data.
3636 * @param dest target codec context, should be initialized with
3637 * avcodec_alloc_context3(), but otherwise uninitialized
3638 * @param src source codec context
3639 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3641 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3644 * Set the fields of the given AVFrame to default values.
3646 * @param pic The AVFrame of which the fields should be set to default values.
3648 void avcodec_get_frame_defaults(AVFrame *pic);
3651 * Allocate an AVFrame and set its fields to default values. The resulting
3652 * struct can be deallocated by simply calling av_free().
3654 * @return An AVFrame filled with default values or NULL on failure.
3655 * @see avcodec_get_frame_defaults
3657 AVFrame *avcodec_alloc_frame(void);
3659 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3660 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3661 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3664 * Return the amount of padding in pixels which the get_buffer callback must
3665 * provide around the edge of the image for codecs which do not have the
3666 * CODEC_FLAG_EMU_EDGE flag.
3668 * @return Required padding in pixels.
3670 unsigned avcodec_get_edge_width(void);
3672 * Modify width and height values so that they will result in a memory
3673 * buffer that is acceptable for the codec if you do not use any horizontal
3676 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3677 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3678 * according to avcodec_get_edge_width() before.
3680 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3682 * Modify width and height values so that they will result in a memory
3683 * buffer that is acceptable for the codec if you also ensure that all
3684 * line sizes are a multiple of the respective linesize_align[i].
3686 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3687 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3688 * according to avcodec_get_edge_width() before.
3690 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3691 int linesize_align[4]);
3693 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3695 #if FF_API_THREAD_INIT
3697 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3699 attribute_deprecated
3700 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3703 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3704 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3705 //FIXME func typedef
3707 #if FF_API_AVCODEC_OPEN
3709 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3710 * function the context has to be allocated.
3712 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3713 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3714 * retrieving a codec.
3716 * @warning This function is not thread safe!
3719 * avcodec_register_all();
3720 * codec = avcodec_find_decoder(CODEC_ID_H264);
3724 * context = avcodec_alloc_context3(codec);
3726 * if (avcodec_open(context, codec) < 0)
3730 * @param avctx The context which will be set up to use the given codec.
3731 * @param codec The codec to use within the context.
3732 * @return zero on success, a negative value on error
3733 * @see avcodec_alloc_context3, avcodec_find_decoder, avcodec_find_encoder, avcodec_close
3735 * @deprecated use avcodec_open2
3737 attribute_deprecated
3738 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3742 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3743 * function the context has to be allocated with avcodec_alloc_context().
3745 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3746 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3747 * retrieving a codec.
3749 * @warning This function is not thread safe!
3752 * avcodec_register_all();
3753 * av_dict_set(&opts, "b", "2.5M", 0);
3754 * codec = avcodec_find_decoder(CODEC_ID_H264);
3758 * context = avcodec_alloc_context();
3760 * if (avcodec_open(context, codec, opts) < 0)
3764 * @param avctx The context to initialize.
3765 * @param options A dictionary filled with AVCodecContext and codec-private options.
3766 * On return this object will be filled with options that were not found.
3768 * @return zero on success, a negative value on error
3769 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3770 * av_dict_set(), av_opt_find().
3772 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3775 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3776 * Some decoders may support multiple frames in a single AVPacket, such
3777 * decoders would then just decode the first frame. In this case,
3778 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3779 * the remaining data in order to decode the second frame etc.
3781 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3782 * decompressed frame size in bytes.
3784 * @warning You must set frame_size_ptr to the allocated size of the
3785 * output buffer before calling avcodec_decode_audio3().
3787 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3788 * the actual read bytes because some optimized bitstream readers read 32 or 64
3789 * bits at once and could read over the end.
3791 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3792 * no overreading happens for damaged MPEG streams.
3794 * @note You might have to align the input buffer avpkt->data and output buffer
3795 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3796 * necessary at all, on others it won't work at all if not aligned and on others
3797 * it will work but it will have an impact on performance.
3799 * In practice, avpkt->data should have 4 byte alignment at minimum and
3800 * samples should be 16 byte aligned unless the CPU doesn't need it
3801 * (AltiVec and SSE do).
3803 * @param avctx the codec context
3804 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3805 * @param[in,out] frame_size_ptr the output buffer size in bytes
3806 * @param[in] avpkt The input AVPacket containing the input buffer.
3807 * You can create such packet with av_init_packet() and by then setting
3808 * data and size, some decoders might in addition need other fields.
3809 * All decoders are designed to use the least fields possible though.
3810 * @return On error a negative value is returned, otherwise the number of bytes
3811 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3813 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3814 int *frame_size_ptr,
3818 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3819 * Some decoders may support multiple frames in a single AVPacket, such
3820 * decoders would then just decode the first frame.
3822 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3823 * the actual read bytes because some optimized bitstream readers read 32 or 64
3824 * bits at once and could read over the end.
3826 * @warning The end of the input buffer buf should be set to 0 to ensure that
3827 * no overreading happens for damaged MPEG streams.
3829 * @note You might have to align the input buffer avpkt->data.
3830 * The alignment requirements depend on the CPU: on some CPUs it isn't
3831 * necessary at all, on others it won't work at all if not aligned and on others
3832 * it will work but it will have an impact on performance.
3834 * In practice, avpkt->data should have 4 byte alignment at minimum.
3836 * @note Some codecs have a delay between input and output, these need to be
3837 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3839 * @param avctx the codec context
3840 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3841 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3842 * allocate memory for the actual bitmap.
3843 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3844 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3845 * decodes and the decoder tells the user once it does not need the data anymore,
3846 * the user app can at this point free/reuse/keep the memory as it sees fit.
3848 * @param[in] avpkt The input AVpacket containing the input buffer.
3849 * You can create such packet with av_init_packet() and by then setting
3850 * data and size, some decoders might in addition need other fields like
3851 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3853 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3854 * @return On error a negative value is returned, otherwise the number of bytes
3855 * used or zero if no frame could be decompressed.
3857 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3858 int *got_picture_ptr,
3862 * Decode a subtitle message.
3863 * Return a negative value on error, otherwise return the number of bytes used.
3864 * If no subtitle could be decompressed, got_sub_ptr is zero.
3865 * Otherwise, the subtitle is stored in *sub.
3866 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3867 * simplicity, because the performance difference is expect to be negligible
3868 * and reusing a get_buffer written for video codecs would probably perform badly
3869 * due to a potentially very different allocation pattern.
3871 * @param avctx the codec context
3872 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3873 freed with avsubtitle_free if *got_sub_ptr is set.
3874 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3875 * @param[in] avpkt The input AVPacket containing the input buffer.
3877 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3882 * Frees all allocated data in the given subtitle struct.
3884 * @param sub AVSubtitle to free.
3886 void avsubtitle_free(AVSubtitle *sub);
3888 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3890 uint8_t *buf, int buf_size);
3893 * Encode an audio frame from samples into buf.
3895 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3896 * However, for PCM audio the user will know how much space is needed
3897 * because it depends on the value passed in buf_size as described
3898 * below. In that case a lower value can be used.
3900 * @param avctx the codec context
3901 * @param[out] buf the output buffer
3902 * @param[in] buf_size the output buffer size
3903 * @param[in] samples the input buffer containing the samples
3904 * The number of samples read from this buffer is frame_size*channels,
3905 * both of which are defined in avctx.
3906 * For PCM audio the number of samples read from samples is equal to
3907 * buf_size * input_sample_size / output_sample_size.
3908 * @return On error a negative value is returned, on success zero or the number
3909 * of bytes used to encode the data read from the input buffer.
3911 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3912 const short *samples);
3915 * Encode a video frame from pict into buf.
3916 * The input picture should be
3917 * stored using a specific format, namely avctx.pix_fmt.
3919 * @param avctx the codec context
3920 * @param[out] buf the output buffer for the bitstream of encoded frame
3921 * @param[in] buf_size the size of the output buffer in bytes
3922 * @param[in] pict the input picture to encode
3923 * @return On error a negative value is returned, on success zero or the number
3924 * of bytes used from the output buffer.
3926 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3927 const AVFrame *pict);
3928 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3929 const AVSubtitle *sub);
3931 int avcodec_close(AVCodecContext *avctx);
3934 * Register all the codecs, parsers and bitstream filters which were enabled at
3935 * configuration time. If you do not call this function you can select exactly
3936 * which formats you want to support, by using the individual registration
3939 * @see avcodec_register
3940 * @see av_register_codec_parser
3941 * @see av_register_bitstream_filter
3943 void avcodec_register_all(void);
3946 * Flush buffers, should be called when seeking or when switching to a different stream.
3948 void avcodec_flush_buffers(AVCodecContext *avctx);
3950 void avcodec_default_free_buffers(AVCodecContext *s);
3952 /* misc useful functions */
3954 #if FF_API_OLD_FF_PICT_TYPES
3956 * Return a single letter to describe the given picture type pict_type.
3958 * @param[in] pict_type the picture type
3959 * @return A single character representing the picture type.
3960 * @deprecated Use av_get_picture_type_char() instead.
3962 attribute_deprecated
3963 char av_get_pict_type_char(int pict_type);
3967 * Return codec bits per sample.
3969 * @param[in] codec_id the codec
3970 * @return Number of bits per sample or zero if unknown for the given codec.
3972 int av_get_bits_per_sample(enum CodecID codec_id);
3974 #if FF_API_OLD_SAMPLE_FMT
3976 * @deprecated Use av_get_bytes_per_sample() instead.
3978 attribute_deprecated
3979 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
3983 typedef struct AVCodecParserContext {
3985 struct AVCodecParser *parser;
3986 int64_t frame_offset; /* offset of the current frame */
3987 int64_t cur_offset; /* current offset
3988 (incremented by each av_parser_parse()) */
3989 int64_t next_frame_offset; /* offset of the next frame */
3991 int pict_type; /* XXX: Put it back in AVCodecContext. */
3993 * This field is used for proper frame duration computation in lavf.
3994 * It signals, how much longer the frame duration of the current frame
3995 * is compared to normal frame duration.
3997 * frame_duration = (1 + repeat_pict) * time_base
3999 * It is used by codecs like H.264 to display telecined material.
4001 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4002 int64_t pts; /* pts of the current frame */
4003 int64_t dts; /* dts of the current frame */
4008 int fetch_timestamp;
4010 #define AV_PARSER_PTS_NB 4
4011 int cur_frame_start_index;
4012 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4013 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4014 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4017 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4018 #define PARSER_FLAG_ONCE 0x0002
4019 /// Set if the parser has a valid file offset
4020 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4022 int64_t offset; ///< byte offset from starting packet start
4023 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4026 * Set by parser to 1 for key frames and 0 for non-key frames.
4027 * It is initialized to -1, so if the parser doesn't set this flag,
4028 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4034 * Time difference in stream time base units from the pts of this
4035 * packet to the point at which the output from the decoder has converged
4036 * independent from the availability of previous frames. That is, the
4037 * frames are virtually identical no matter if decoding started from
4038 * the very first frame or from this keyframe.
4039 * Is AV_NOPTS_VALUE if unknown.
4040 * This field is not the display duration of the current frame.
4041 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4044 * The purpose of this field is to allow seeking in streams that have no
4045 * keyframes in the conventional sense. It corresponds to the
4046 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4047 * essential for some types of subtitle streams to ensure that all
4048 * subtitles are correctly displayed after seeking.
4050 int64_t convergence_duration;
4052 // Timestamp generation support:
4054 * Synchronization point for start of timestamp generation.
4056 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4059 * For example, this corresponds to presence of H.264 buffering period
4065 * Offset of the current timestamp against last timestamp sync point in
4066 * units of AVCodecContext.time_base.
4068 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4069 * contain a valid timestamp offset.
4071 * Note that the timestamp of sync point has usually a nonzero
4072 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4073 * the next frame after timestamp sync point will be usually 1.
4075 * For example, this corresponds to H.264 cpb_removal_delay.
4077 int dts_ref_dts_delta;
4080 * Presentation delay of current frame in units of AVCodecContext.time_base.
4082 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4083 * contain valid non-negative timestamp delta (presentation time of a frame
4084 * must not lie in the past).
4086 * This delay represents the difference between decoding and presentation
4087 * time of the frame.
4089 * For example, this corresponds to H.264 dpb_output_delay.
4094 * Position of the packet in file.
4096 * Analogous to cur_frame_pts/dts
4098 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4101 * Byte position of currently parsed frame in stream.
4106 * Previous frame byte position.
4109 } AVCodecParserContext;
4111 typedef struct AVCodecParser {
4112 int codec_ids[5]; /* several codec IDs are permitted */
4114 int (*parser_init)(AVCodecParserContext *s);
4115 int (*parser_parse)(AVCodecParserContext *s,
4116 AVCodecContext *avctx,
4117 const uint8_t **poutbuf, int *poutbuf_size,
4118 const uint8_t *buf, int buf_size);
4119 void (*parser_close)(AVCodecParserContext *s);
4120 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4121 struct AVCodecParser *next;
4124 AVCodecParser *av_parser_next(AVCodecParser *c);
4126 void av_register_codec_parser(AVCodecParser *parser);
4127 AVCodecParserContext *av_parser_init(int codec_id);
4132 * @param s parser context.
4133 * @param avctx codec context.
4134 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4135 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4136 * @param buf input buffer.
4137 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4138 * @param pts input presentation timestamp.
4139 * @param dts input decoding timestamp.
4140 * @param pos input byte position in stream.
4141 * @return the number of bytes of the input bitstream used.
4146 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4153 * decode_frame(data, size);
4157 int av_parser_parse2(AVCodecParserContext *s,
4158 AVCodecContext *avctx,
4159 uint8_t **poutbuf, int *poutbuf_size,
4160 const uint8_t *buf, int buf_size,
4161 int64_t pts, int64_t dts,
4164 int av_parser_change(AVCodecParserContext *s,
4165 AVCodecContext *avctx,
4166 uint8_t **poutbuf, int *poutbuf_size,
4167 const uint8_t *buf, int buf_size, int keyframe);
4168 void av_parser_close(AVCodecParserContext *s);
4171 typedef struct AVBitStreamFilterContext {
4173 struct AVBitStreamFilter *filter;
4174 AVCodecParserContext *parser;
4175 struct AVBitStreamFilterContext *next;
4176 } AVBitStreamFilterContext;
4179 typedef struct AVBitStreamFilter {
4182 int (*filter)(AVBitStreamFilterContext *bsfc,
4183 AVCodecContext *avctx, const char *args,
4184 uint8_t **poutbuf, int *poutbuf_size,
4185 const uint8_t *buf, int buf_size, int keyframe);
4186 void (*close)(AVBitStreamFilterContext *bsfc);
4187 struct AVBitStreamFilter *next;
4188 } AVBitStreamFilter;
4190 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4191 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4192 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4193 AVCodecContext *avctx, const char *args,
4194 uint8_t **poutbuf, int *poutbuf_size,
4195 const uint8_t *buf, int buf_size, int keyframe);
4196 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4198 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4203 * Reallocate the given block if it is not large enough, otherwise do nothing.
4207 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4210 * Allocate a buffer, reusing the given one if large enough.
4212 * Contrary to av_fast_realloc the current buffer contents might not be
4213 * preserved and on error the old buffer is freed, thus no special
4214 * handling to avoid memleaks is necessary.
4216 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4217 * @param size size of the buffer *ptr points to
4218 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4219 * *size 0 if an error occurred.
4221 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4224 * Copy image src to dst. Wraps av_picture_data_copy() above.
4226 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4227 enum PixelFormat pix_fmt, int width, int height);
4230 * Crop image top and left side.
4232 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4233 enum PixelFormat pix_fmt, int top_band, int left_band);
4238 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4239 int padtop, int padbottom, int padleft, int padright, int *color);
4242 * Encode extradata length to a buffer. Used by xiph codecs.
4244 * @param s buffer to write to; must be at least (v/255+1) bytes long
4245 * @param v size of extradata in bytes
4246 * @return number of bytes written to the buffer.
4248 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4251 * Logs a generic warning message about a missing feature. This function is
4252 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4253 * only, and would normally not be used by applications.
4254 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4255 * a pointer to an AVClass struct
4256 * @param[in] feature string containing the name of the missing feature
4257 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4258 * If want_sample is non-zero, additional verbage will be added to the log
4259 * message which tells the user how to report samples to the development
4262 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4265 * Log a generic warning message asking for a sample. This function is
4266 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4267 * only, and would normally not be used by applications.
4268 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4269 * a pointer to an AVClass struct
4270 * @param[in] msg string containing an optional message, or NULL if no message
4272 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4275 * Register the hardware accelerator hwaccel.
4277 void av_register_hwaccel(AVHWAccel *hwaccel);
4280 * If hwaccel is NULL, returns the first registered hardware accelerator,
4281 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4282 * after hwaccel, or NULL if hwaccel is the last one.
4284 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4288 * Lock operation used by lockmgr
4291 AV_LOCK_CREATE, ///< Create a mutex
4292 AV_LOCK_OBTAIN, ///< Lock the mutex
4293 AV_LOCK_RELEASE, ///< Unlock the mutex
4294 AV_LOCK_DESTROY, ///< Free mutex resources
4298 * Register a user provided lock manager supporting the operations
4299 * specified by AVLockOp. mutex points to a (void *) where the
4300 * lockmgr should store/get a pointer to a user allocated mutex. It's
4301 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4303 * @param cb User defined callback. Note: Libav may invoke calls to this
4304 * callback during the call to av_lockmgr_register().
4305 * Thus, the application must be prepared to handle that.
4306 * If cb is set to NULL the lockmgr will be unregistered.
4307 * Also note that during unregistration the previously registered
4308 * lockmgr callback may also be invoked.
4310 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4313 * Get the type of the given codec.
4315 enum AVMediaType avcodec_get_type(enum CodecID codec_id);
4317 #endif /* AVCODEC_AVCODEC_H */