2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
34 #include "libavcodec/version.h"
36 #if LIBAVCODEC_VERSION_MAJOR < 53
37 # define FF_INTERNALC_MEM_TYPE unsigned int
39 # define FF_INTERNALC_MEM_TYPE size_t
43 * Identify the syntax and semantics of the bitstream.
44 * The principle is roughly:
45 * Two decoders with the same ID can decode the same streams.
46 * Two encoders with the same ID can encode compatible streams.
47 * There may be slight deviations from the principle due to implementation
50 * If you add a codec ID to this list, add it so that
51 * 1. no value of a existing codec ID changes (that would break ABI),
52 * 2. it is as close as possible to similar codecs.
59 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
60 CODEC_ID_MPEG2VIDEO_XVMC,
97 CODEC_ID_INTERPLAY_VIDEO,
109 CODEC_ID_TRUEMOTION1,
120 #if LIBAVCODEC_VERSION_MAJOR < 53
139 CODEC_ID_TRUEMOTION2,
156 CODEC_ID_DSICINVIDEO,
157 CODEC_ID_TIERTEXSEQVIDEO,
166 CODEC_ID_BETHSOFTVID,
184 CODEC_ID_MOTIONPIXELS,
202 CODEC_ID_IFF_BYTERUN1,
216 /* various PCM "codecs" */
217 CODEC_ID_PCM_S16LE= 0x10000,
233 CODEC_ID_PCM_S24DAUD,
235 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_DVD_SUBTITLE= 0x17000,
347 CODEC_ID_DVB_SUBTITLE,
348 CODEC_ID_TEXT, ///< raw UTF-8 text
352 CODEC_ID_HDMV_PGS_SUBTITLE,
353 CODEC_ID_DVB_TELETEXT,
356 /* other specific kind of codecs (generally used for attachments) */
357 CODEC_ID_TTF= 0x18000,
359 CODEC_ID_PROBE= 0x19000, ///< codec_id is not known (like CODEC_ID_NONE) but lavf should attempt to identify it
361 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
362 * stream (only used by libavformat) */
363 CODEC_ID_FFMETADATA=0x21000, ///< Dummy codec for streams containing only metadata information.
366 #if LIBAVCODEC_VERSION_MAJOR < 53
367 #define CodecType AVMediaType
369 #define CODEC_TYPE_UNKNOWN AVMEDIA_TYPE_UNKNOWN
370 #define CODEC_TYPE_VIDEO AVMEDIA_TYPE_VIDEO
371 #define CODEC_TYPE_AUDIO AVMEDIA_TYPE_AUDIO
372 #define CODEC_TYPE_DATA AVMEDIA_TYPE_DATA
373 #define CODEC_TYPE_SUBTITLE AVMEDIA_TYPE_SUBTITLE
374 #define CODEC_TYPE_ATTACHMENT AVMEDIA_TYPE_ATTACHMENT
375 #define CODEC_TYPE_NB AVMEDIA_TYPE_NB
378 #if FF_API_OLD_SAMPLE_FMT
379 #define SampleFormat AVSampleFormat
381 #define SAMPLE_FMT_NONE AV_SAMPLE_FMT_NONE
382 #define SAMPLE_FMT_U8 AV_SAMPLE_FMT_U8
383 #define SAMPLE_FMT_S16 AV_SAMPLE_FMT_S16
384 #define SAMPLE_FMT_S32 AV_SAMPLE_FMT_S32
385 #define SAMPLE_FMT_FLT AV_SAMPLE_FMT_FLT
386 #define SAMPLE_FMT_DBL AV_SAMPLE_FMT_DBL
387 #define SAMPLE_FMT_NB AV_SAMPLE_FMT_NB
390 #if FF_API_OLD_AUDIOCONVERT
391 #include "libavutil/audioconvert.h"
393 /* Audio channel masks */
394 #define CH_FRONT_LEFT AV_CH_FRONT_LEFT
395 #define CH_FRONT_RIGHT AV_CH_FRONT_RIGHT
396 #define CH_FRONT_CENTER AV_CH_FRONT_CENTER
397 #define CH_LOW_FREQUENCY AV_CH_LOW_FREQUENCY
398 #define CH_BACK_LEFT AV_CH_BACK_LEFT
399 #define CH_BACK_RIGHT AV_CH_BACK_RIGHT
400 #define CH_FRONT_LEFT_OF_CENTER AV_CH_FRONT_LEFT_OF_CENTER
401 #define CH_FRONT_RIGHT_OF_CENTER AV_CH_FRONT_RIGHT_OF_CENTER
402 #define CH_BACK_CENTER AV_CH_BACK_CENTER
403 #define CH_SIDE_LEFT AV_CH_SIDE_LEFT
404 #define CH_SIDE_RIGHT AV_CH_SIDE_RIGHT
405 #define CH_TOP_CENTER AV_CH_TOP_CENTER
406 #define CH_TOP_FRONT_LEFT AV_CH_TOP_FRONT_LEFT
407 #define CH_TOP_FRONT_CENTER AV_CH_TOP_FRONT_CENTER
408 #define CH_TOP_FRONT_RIGHT AV_CH_TOP_FRONT_RIGHT
409 #define CH_TOP_BACK_LEFT AV_CH_TOP_BACK_LEFT
410 #define CH_TOP_BACK_CENTER AV_CH_TOP_BACK_CENTER
411 #define CH_TOP_BACK_RIGHT AV_CH_TOP_BACK_RIGHT
412 #define CH_STEREO_LEFT AV_CH_STEREO_LEFT
413 #define CH_STEREO_RIGHT AV_CH_STEREO_RIGHT
415 /** Channel mask value used for AVCodecContext.request_channel_layout
416 to indicate that the user requests the channel order of the decoder output
417 to be the native codec channel order. */
418 #define CH_LAYOUT_NATIVE AV_CH_LAYOUT_NATIVE
420 /* Audio channel convenience macros */
421 #define CH_LAYOUT_MONO AV_CH_LAYOUT_MONO
422 #define CH_LAYOUT_STEREO AV_CH_LAYOUT_STEREO
423 #define CH_LAYOUT_2_1 AV_CH_LAYOUT_2_1
424 #define CH_LAYOUT_SURROUND AV_CH_LAYOUT_SURROUND
425 #define CH_LAYOUT_4POINT0 AV_CH_LAYOUT_4POINT0
426 #define CH_LAYOUT_2_2 AV_CH_LAYOUT_2_2
427 #define CH_LAYOUT_QUAD AV_CH_LAYOUT_QUAD
428 #define CH_LAYOUT_5POINT0 AV_CH_LAYOUT_5POINT0
429 #define CH_LAYOUT_5POINT1 AV_CH_LAYOUT_5POINT1
430 #define CH_LAYOUT_5POINT0_BACK AV_CH_LAYOUT_5POINT0_BACK
431 #define CH_LAYOUT_5POINT1_BACK AV_CH_LAYOUT_5POINT1_BACK
432 #define CH_LAYOUT_7POINT0 AV_CH_LAYOUT_7POINT0
433 #define CH_LAYOUT_7POINT1 AV_CH_LAYOUT_7POINT1
434 #define CH_LAYOUT_7POINT1_WIDE AV_CH_LAYOUT_7POINT1_WIDE
435 #define CH_LAYOUT_STEREO_DOWNMIX AV_CH_LAYOUT_STEREO_DOWNMIX
439 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
442 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
443 * This is mainly needed because some optimized bitstream readers read
444 * 32 or 64 bit at once and could read over the end.<br>
445 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
446 * MPEG bitstreams could cause overread and segfault.
448 #define FF_INPUT_BUFFER_PADDING_SIZE 8
451 * minimum encoding buffer size
452 * Used to avoid some checks during header writing.
454 #define FF_MIN_BUFFER_SIZE 16384
458 * motion estimation type.
461 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
465 ME_EPZS, ///< enhanced predictive zonal search
466 ME_X1, ///< reserved for experiments
467 ME_HEX, ///< hexagon based search
468 ME_UMH, ///< uneven multi-hexagon search
469 ME_ITER, ///< iterative search
470 ME_TESA, ///< transformed exhaustive search algorithm
474 /* We leave some space between them for extensions (drop some
475 * keyframes for intra-only or drop just some bidir frames). */
476 AVDISCARD_NONE =-16, ///< discard nothing
477 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
478 AVDISCARD_NONREF = 8, ///< discard all non reference
479 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
480 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
481 AVDISCARD_ALL = 48, ///< discard all
484 enum AVColorPrimaries{
485 AVCOL_PRI_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
486 AVCOL_PRI_UNSPECIFIED=2,
488 AVCOL_PRI_BT470BG =5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
489 AVCOL_PRI_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
490 AVCOL_PRI_SMPTE240M =7, ///< functionally identical to above
492 AVCOL_PRI_NB , ///< Not part of ABI
495 enum AVColorTransferCharacteristic{
496 AVCOL_TRC_BT709 =1, ///< also ITU-R BT1361
497 AVCOL_TRC_UNSPECIFIED=2,
498 AVCOL_TRC_GAMMA22 =4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
499 AVCOL_TRC_GAMMA28 =5, ///< also ITU-R BT470BG
500 AVCOL_TRC_NB , ///< Not part of ABI
505 AVCOL_SPC_BT709 =1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
506 AVCOL_SPC_UNSPECIFIED=2,
508 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
509 AVCOL_SPC_SMPTE170M =6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
510 AVCOL_SPC_SMPTE240M =7,
511 AVCOL_SPC_NB , ///< Not part of ABI
515 AVCOL_RANGE_UNSPECIFIED=0,
516 AVCOL_RANGE_MPEG =1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
517 AVCOL_RANGE_JPEG =2, ///< the normal 2^n-1 "JPEG" YUV ranges
518 AVCOL_RANGE_NB , ///< Not part of ABI
522 * X X 3 4 X X are luma samples,
523 * 1 2 1-6 are possible chroma positions
524 * X X 5 6 X 0 is undefined/unknown position
526 enum AVChromaLocation{
527 AVCHROMA_LOC_UNSPECIFIED=0,
528 AVCHROMA_LOC_LEFT =1, ///< mpeg2/4, h264 default
529 AVCHROMA_LOC_CENTER =2, ///< mpeg1, jpeg, h263
530 AVCHROMA_LOC_TOPLEFT =3, ///< DV
532 AVCHROMA_LOC_BOTTOMLEFT =5,
533 AVCHROMA_LOC_BOTTOM =6,
534 AVCHROMA_LOC_NB , ///< Not part of ABI
541 AV_LPC_TYPE_DEFAULT = -1, ///< use the codec default LPC type
542 AV_LPC_TYPE_NONE = 0, ///< do not use LPC prediction or use all zero coefficients
543 AV_LPC_TYPE_FIXED = 1, ///< fixed LPC coefficients
544 AV_LPC_TYPE_LEVINSON = 2, ///< Levinson-Durbin recursion
545 AV_LPC_TYPE_CHOLESKY = 3, ///< Cholesky factorization
546 AV_LPC_TYPE_NB , ///< Not part of ABI
549 enum AVAudioServiceType {
550 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
551 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
552 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
553 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
554 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
555 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
556 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
557 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
558 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
559 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
562 typedef struct RcOverride{
565 int qscale; // If this is 0 then quality_factor will be used instead.
566 float quality_factor;
569 #define FF_MAX_B_FRAMES 16
572 These flags can be passed in AVCodecContext.flags before initialization.
573 Note: Not everything is supported yet.
576 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
577 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
578 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
579 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
580 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
581 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
583 * The parent program guarantees that the input for B-frames containing
584 * streams is not written to for at least s->max_b_frames+1 frames, if
585 * this is not set the input will be copied.
587 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
588 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
589 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
590 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
591 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
592 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
593 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
594 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
595 location instead of only at frame boundaries. */
596 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
597 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
598 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
599 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
600 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
601 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
602 /* Fx : Flag for h263+ extra options */
603 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
604 #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 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
608 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
609 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
610 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
611 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
612 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
613 #define CODEC_FLAG_CLOSED_GOP 0x80000000
614 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
615 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
616 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
617 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
618 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
619 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
620 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
621 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
622 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
623 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
624 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
625 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
626 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
627 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
628 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
629 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
630 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
631 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
632 #define CODEC_FLAG2_MBTREE 0x00040000 ///< Use macroblock tree ratecontrol (x264 only)
633 #define CODEC_FLAG2_PSY 0x00080000 ///< Use psycho visual optimizations.
634 #define CODEC_FLAG2_SSIM 0x00100000 ///< Compute SSIM during encoding, error[] values are undefined.
635 #define CODEC_FLAG2_INTRA_REFRESH 0x00200000 ///< Use periodic insertion of intra blocks instead of keyframes.
637 /* Unsupported options :
638 * Syntax Arithmetic coding (SAC)
639 * Reference Picture Selection
640 * Independent Segment Decoding */
642 /* codec capabilities */
644 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
646 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
647 * If not set, it might not use get_buffer() at all or use operations that
648 * assume the buffer was allocated by avcodec_default_get_buffer.
650 #define CODEC_CAP_DR1 0x0002
651 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
652 #define CODEC_CAP_PARSE_ONLY 0x0004
653 #define CODEC_CAP_TRUNCATED 0x0008
654 /* Codec can export data for HW decoding (XvMC). */
655 #define CODEC_CAP_HWACCEL 0x0010
657 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
658 * If this is not set, the codec is guaranteed to never be fed with NULL data.
660 #define CODEC_CAP_DELAY 0x0020
662 * Codec can be fed a final frame with a smaller size.
663 * This can be used to prevent truncation of the last audio samples.
665 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
667 * Codec can export data for HW decoding (VDPAU).
669 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
671 * Codec can output multiple frames per AVPacket
672 * Normally demuxers return one frame at a time, demuxers which do not do
673 * are connected to a parser to split what they return into proper frames.
674 * This flag is reserved to the very rare category of codecs which have a
675 * bitstream that cannot be split into frames without timeconsuming
676 * operations like full decoding. Demuxers carring such bitstreams thus
677 * may return multiple frames in a packet. This has many disadvantages like
678 * prohibiting stream copy in many cases thus it should only be considered
681 #define CODEC_CAP_SUBFRAMES 0x0100
683 * Codec is experimental and is thus avoided in favor of non experimental
686 #define CODEC_CAP_EXPERIMENTAL 0x0200
688 * Codec should fill in channel configuration and samplerate instead of container
690 #define CODEC_CAP_CHANNEL_CONF 0x0400
693 * Codec is able to deal with negative linesizes
695 #define CODEC_CAP_NEG_LINESIZES 0x0800
698 * Codec supports frame-level multithreading.
700 #define CODEC_CAP_FRAME_THREADS 0x1000
702 //The following defines may change, don't expect compatibility if you use them.
703 #define MB_TYPE_INTRA4x4 0x0001
704 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
705 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
706 #define MB_TYPE_16x16 0x0008
707 #define MB_TYPE_16x8 0x0010
708 #define MB_TYPE_8x16 0x0020
709 #define MB_TYPE_8x8 0x0040
710 #define MB_TYPE_INTERLACED 0x0080
711 #define MB_TYPE_DIRECT2 0x0100 //FIXME
712 #define MB_TYPE_ACPRED 0x0200
713 #define MB_TYPE_GMC 0x0400
714 #define MB_TYPE_SKIP 0x0800
715 #define MB_TYPE_P0L0 0x1000
716 #define MB_TYPE_P1L0 0x2000
717 #define MB_TYPE_P0L1 0x4000
718 #define MB_TYPE_P1L1 0x8000
719 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
720 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
721 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
722 #define MB_TYPE_QUANT 0x00010000
723 #define MB_TYPE_CBP 0x00020000
724 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
728 * This specifies the area which should be displayed.
729 * Note there may be multiple such areas for one frame.
731 typedef struct AVPanScan{
734 * - encoding: Set by user.
735 * - decoding: Set by libavcodec.
740 * width and height in 1/16 pel
741 * - encoding: Set by user.
742 * - decoding: Set by libavcodec.
748 * position of the top left corner in 1/16 pel for up to 3 fields/frames
749 * - encoding: Set by user.
750 * - decoding: Set by libavcodec.
752 int16_t position[3][2];
755 #define FF_COMMON_FRAME \
757 * pointer to the picture planes.\
758 * This might be different from the first allocated byte\
765 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
766 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
772 * 1 -> keyframe, 0-> not\
773 * - encoding: Set by libavcodec.\
774 * - decoding: Set by libavcodec.\
779 * Picture type of the frame, see ?_TYPE below.\
780 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
781 * - decoding: Set by libavcodec.\
786 * presentation timestamp in time_base units (time when frame should be shown to user)\
787 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
788 * - encoding: MUST be set by user.\
789 * - decoding: Set by libavcodec.\
794 * picture number in bitstream order\
795 * - encoding: set by\
796 * - decoding: Set by libavcodec.\
798 int coded_picture_number;\
800 * picture number in display order\
801 * - encoding: set by\
802 * - decoding: Set by libavcodec.\
804 int display_picture_number;\
807 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
808 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
809 * - decoding: Set by libavcodec.\
814 * buffer age (1->was last buffer and dint change, 2->..., ...).\
815 * Set to INT_MAX if the buffer has not been used yet.\
816 * - encoding: unused\
817 * - decoding: MUST be set by get_buffer().\
822 * is this picture used as reference\
823 * The values for this are the same as the MpegEncContext.picture_structure\
824 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
825 * Set to 4 for delayed, non-reference frames.\
826 * - encoding: unused\
827 * - decoding: Set by libavcodec. (before get_buffer() call)).\
833 * - encoding: unused\
834 * - decoding: Set by libavcodec.\
836 int8_t *qscale_table;\
839 * - encoding: unused\
840 * - decoding: Set by libavcodec.\
845 * mbskip_table[mb]>=1 if MB didn't change\
846 * stride= mb_width = (width+15)>>4\
847 * - encoding: unused\
848 * - decoding: Set by libavcodec.\
850 uint8_t *mbskip_table;\
853 * motion vector table\
856 * int mv_sample_log2= 4 - motion_subsample_log2;\
857 * int mb_width= (width+15)>>4;\
858 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
859 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
861 * - encoding: Set by user.\
862 * - decoding: Set by libavcodec.\
864 int16_t (*motion_val[2])[2];\
867 * macroblock type table\
868 * mb_type_base + mb_width + 2\
869 * - encoding: Set by user.\
870 * - decoding: Set by libavcodec.\
875 * log2 of the size of the block which a single vector in motion_val represents: \
876 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
877 * - encoding: unused\
878 * - decoding: Set by libavcodec.\
880 uint8_t motion_subsample_log2;\
883 * for some private data of the user\
884 * - encoding: unused\
885 * - decoding: Set by user.\
891 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
892 * - decoding: unused\
897 * type of the buffer (to keep track of who has to deallocate data[*])\
898 * - encoding: Set by the one who allocates it.\
899 * - decoding: Set by the one who allocates it.\
900 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
905 * When decoding, this signals how much the picture must be delayed.\
906 * extra_delay = repeat_pict / (2*fps)\
907 * - encoding: unused\
908 * - decoding: Set by libavcodec.\
918 * The content of the picture is interlaced.\
919 * - encoding: Set by user.\
920 * - decoding: Set by libavcodec. (default 0)\
922 int interlaced_frame;\
925 * If the content is interlaced, is top field displayed first.\
926 * - encoding: Set by user.\
927 * - decoding: Set by libavcodec.\
929 int top_field_first;\
933 * - encoding: Set by user.\
934 * - decoding: Set by libavcodec.\
936 AVPanScan *pan_scan;\
939 * Tell user application that palette has changed from previous frame.\
940 * - encoding: ??? (no palette-enabled encoder yet)\
941 * - decoding: Set by libavcodec. (default 0).\
943 int palette_has_changed;\
946 * codec suggestion on buffer type if != 0\
947 * - encoding: unused\
948 * - decoding: Set by libavcodec. (before get_buffer() call)).\
954 * - encoding: unused\
955 * - decoding: Set by libavcodec.\
960 * motion reference frame index\
961 * the order in which these are stored can depend on the codec.\
962 * - encoding: Set by user.\
963 * - decoding: Set by libavcodec.\
965 int8_t *ref_index[2];\
968 * reordered opaque 64bit (generally an integer or a double precision float\
969 * PTS but can be anything). \
970 * The user sets AVCodecContext.reordered_opaque to represent the input at\
972 * the decoder reorders values as needed and sets AVFrame.reordered_opaque\
973 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque \
974 * @deprecated in favor of pkt_pts\
975 * - encoding: unused\
976 * - decoding: Read by user.\
978 int64_t reordered_opaque;\
981 * hardware accelerator private data (FFmpeg allocated)\
982 * - encoding: unused\
983 * - decoding: Set by libavcodec\
985 void *hwaccel_picture_private;\
988 * reordered pts from the last AVPacket that has been input into the decoder\
989 * - encoding: unused\
990 * - decoding: Read by user.\
995 * dts from the last AVPacket that has been input into the decoder\
996 * - encoding: unused\
997 * - decoding: Read by user.\
1002 * the AVCodecContext which ff_thread_get_buffer() was last called on\
1003 * - encoding: Set by libavcodec.\
1004 * - decoding: Set by libavcodec.\
1006 struct AVCodecContext *owner;\
1009 * used by multithreading to store frame-specific info\
1010 * - encoding: Set by libavcodec.\
1011 * - decoding: Set by libavcodec.\
1013 void *thread_opaque;\
1016 * frame timestamp estimated using various heuristics, in stream time base\
1017 * - encoding: unused\
1018 * - decoding: set by libavcodec, read by user.\
1020 int64_t best_effort_timestamp;\
1023 #define FF_QSCALE_TYPE_MPEG1 0
1024 #define FF_QSCALE_TYPE_MPEG2 1
1025 #define FF_QSCALE_TYPE_H264 2
1026 #define FF_QSCALE_TYPE_VP56 3
1028 #define FF_BUFFER_TYPE_INTERNAL 1
1029 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
1030 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
1031 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
1034 #define FF_I_TYPE 1 ///< Intra
1035 #define FF_P_TYPE 2 ///< Predicted
1036 #define FF_B_TYPE 3 ///< Bi-dir predicted
1037 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
1038 #define FF_SI_TYPE 5 ///< Switching Intra
1039 #define FF_SP_TYPE 6 ///< Switching Predicted
1040 #define FF_BI_TYPE 7
1042 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
1043 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
1044 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
1045 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
1047 typedef struct AVPacket {
1049 * Presentation timestamp in AVStream->time_base units; the time at which
1050 * the decompressed packet will be presented to the user.
1051 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1052 * pts MUST be larger or equal to dts as presentation cannot happen before
1053 * decompression, unless one wants to view hex dumps. Some formats misuse
1054 * the terms dts and pts/cts to mean something different. Such timestamps
1055 * must be converted to true pts/dts before they are stored in AVPacket.
1059 * Decompression timestamp in AVStream->time_base units; the time at which
1060 * the packet is decompressed.
1061 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1069 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1070 * Equals next_pts - this_pts in presentation order.
1073 void (*destruct)(struct AVPacket *);
1075 int64_t pos; ///< byte position in stream, -1 if unknown
1078 * Time difference in AVStream->time_base units from the pts of this
1079 * packet to the point at which the output from the decoder has converged
1080 * independent from the availability of previous frames. That is, the
1081 * frames are virtually identical no matter if decoding started from
1082 * the very first frame or from this keyframe.
1083 * Is AV_NOPTS_VALUE if unknown.
1084 * This field is not the display duration of the current packet.
1085 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1088 * The purpose of this field is to allow seeking in streams that have no
1089 * keyframes in the conventional sense. It corresponds to the
1090 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1091 * essential for some types of subtitle streams to ensure that all
1092 * subtitles are correctly displayed after seeking.
1094 int64_t convergence_duration;
1096 #define AV_PKT_FLAG_KEY 0x0001
1097 #if LIBAVCODEC_VERSION_MAJOR < 53
1098 #define PKT_FLAG_KEY AV_PKT_FLAG_KEY
1102 * Audio Video Frame.
1103 * New fields can be added to the end of FF_COMMON_FRAME with minor version
1105 * Removal, reordering and changes to existing fields require a major
1106 * version bump. No fields should be added into AVFrame before or after
1108 * sizeof(AVFrame) must not be used outside libav*.
1110 typedef struct AVFrame {
1115 * main external API structure.
1116 * New fields can be added to the end with minor version bumps.
1117 * Removal, reordering and changes to existing fields require a major
1119 * sizeof(AVCodecContext) must not be used outside libav*.
1121 typedef struct AVCodecContext {
1123 * information on struct for av_log
1124 * - set by avcodec_alloc_context
1126 const AVClass *av_class;
1128 * the average bitrate
1129 * - encoding: Set by user; unused for constant quantizer encoding.
1130 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1135 * number of bits the bitstream is allowed to diverge from the reference.
1136 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1137 * - encoding: Set by user; unused for constant quantizer encoding.
1138 * - decoding: unused
1140 int bit_rate_tolerance;
1144 * - encoding: Set by user.
1145 * - decoding: Set by user.
1150 * Some codecs need additional format info. It is stored here.
1151 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
1152 * specific codec MUST set it correctly otherwise stream copy breaks.
1153 * In general use of this field by muxers is not recommanded.
1154 * - encoding: Set by libavcodec.
1155 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
1160 * Motion estimation algorithm used for video coding.
1161 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1162 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1163 * - encoding: MUST be set by user.
1164 * - decoding: unused
1169 * some codecs need / can use extradata like Huffman tables.
1170 * mjpeg: Huffman tables
1171 * rv10: additional flags
1172 * mpeg4: global headers (they can be in the bitstream or here)
1173 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1174 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1175 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1176 * - encoding: Set/allocated/freed by libavcodec.
1177 * - decoding: Set/allocated/freed by user.
1183 * This is the fundamental unit of time (in seconds) in terms
1184 * of which frame timestamps are represented. For fixed-fps content,
1185 * timebase should be 1/framerate and timestamp increments should be
1187 * - encoding: MUST be set by user.
1188 * - decoding: Set by libavcodec.
1190 AVRational time_base;
1194 * picture width / height.
1195 * - encoding: MUST be set by user.
1196 * - decoding: Set by libavcodec.
1197 * Note: For compatibility it is possible to set this instead of
1198 * coded_width/height before decoding.
1202 #define FF_ASPECT_EXTENDED 15
1205 * the number of pictures in a group of pictures, or 0 for intra_only
1206 * - encoding: Set by user.
1207 * - decoding: unused
1212 * Pixel format, see PIX_FMT_xxx.
1213 * May be set by the demuxer if known from headers.
1214 * May be overriden by the decoder if it knows better.
1215 * - encoding: Set by user.
1216 * - decoding: Set by user if known, overridden by libavcodec if known
1218 enum PixelFormat pix_fmt;
1221 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
1222 * has to read frames at native frame rate.
1223 * - encoding: Set by user.
1224 * - decoding: unused
1229 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1230 * decoder to draw a horizontal band. It improves cache usage. Not
1231 * all codecs can do that. You must check the codec capabilities
1233 * When multithreading is used, it may be called from multiple threads
1234 * at the same time; threads might draw different parts of the same AVFrame,
1235 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1237 * The function is also used by hardware acceleration APIs.
1238 * It is called at least once during frame decoding to pass
1239 * the data needed for hardware render.
1240 * In that mode instead of pixel data, AVFrame points to
1241 * a structure specific to the acceleration API. The application
1242 * reads the structure and can change some fields to indicate progress
1244 * - encoding: unused
1245 * - decoding: Set by user.
1246 * @param height the height of the slice
1247 * @param y the y position of the slice
1248 * @param type 1->top field, 2->bottom field, 3->frame
1249 * @param offset offset into the AVFrame.data from which the slice should be read
1251 void (*draw_horiz_band)(struct AVCodecContext *s,
1252 const AVFrame *src, int offset[4],
1253 int y, int type, int height);
1256 int sample_rate; ///< samples per second
1257 int channels; ///< number of audio channels
1260 * audio sample format
1261 * - encoding: Set by user.
1262 * - decoding: Set by libavcodec.
1264 enum AVSampleFormat sample_fmt; ///< sample format
1266 /* The following data should not be initialized. */
1268 * Samples per packet, initialized when calling 'init'.
1271 int frame_number; ///< audio or video frame number
1272 #if LIBAVCODEC_VERSION_MAJOR < 53
1273 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
1277 * Number of frames the decoded output will be delayed relative to
1278 * the encoded input.
1279 * - encoding: Set by libavcodec.
1280 * - decoding: unused
1284 /* - encoding parameters */
1285 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1286 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1290 * - encoding: Set by user.
1291 * - decoding: unused
1297 * - encoding: Set by user.
1298 * - decoding: unused
1303 * maximum quantizer difference between frames
1304 * - encoding: Set by user.
1305 * - decoding: unused
1310 * maximum number of B-frames between non-B-frames
1311 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1312 * - encoding: Set by user.
1313 * - decoding: unused
1318 * qscale factor between IP and B-frames
1319 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1320 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1321 * - encoding: Set by user.
1322 * - decoding: unused
1324 float b_quant_factor;
1326 /** obsolete FIXME remove */
1328 #define FF_RC_STRATEGY_XVID 1
1330 int b_frame_strategy;
1334 * - encoding: unused
1335 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1336 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1340 struct AVCodec *codec;
1344 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1345 /* do its best to deliver a chunk with size */
1346 /* below rtp_payload_size, the chunk will start */
1347 /* with a start code on some codecs like H.263. */
1348 /* This doesn't take account of any particular */
1349 /* headers inside the transmitted RTP payload. */
1352 /* The RTP callback: This function is called */
1353 /* every time the encoder has a packet to send. */
1354 /* It depends on the encoder if the data starts */
1355 /* with a Start Code (it should). H.263 does. */
1356 /* mb_nb contains the number of macroblocks */
1357 /* encoded in the RTP payload. */
1358 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1360 /* statistics, used for 2-pass encoding */
1371 * number of bits used for the previously encoded frame
1372 * - encoding: Set by libavcodec.
1373 * - decoding: unused
1378 * Private data of the user, can be used to carry app specific stuff.
1379 * - encoding: Set by user.
1380 * - decoding: Set by user.
1384 char codec_name[32];
1385 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1386 enum CodecID codec_id; /* see CODEC_ID_xxx */
1389 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1390 * This is used to work around some encoder bugs.
1391 * A demuxer should set this to what is stored in the field used to identify the codec.
1392 * If there are multiple such fields in a container then the demuxer should choose the one
1393 * which maximizes the information about the used codec.
1394 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1395 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1396 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1398 * - encoding: Set by user, if not then the default based on codec_id will be used.
1399 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1401 unsigned int codec_tag;
1404 * Work around bugs in encoders which sometimes cannot be detected automatically.
1405 * - encoding: Set by user
1406 * - decoding: Set by user
1408 int workaround_bugs;
1409 #define FF_BUG_AUTODETECT 1 ///< autodetection
1410 #define FF_BUG_OLD_MSMPEG4 2
1411 #define FF_BUG_XVID_ILACE 4
1412 #define FF_BUG_UMP4 8
1413 #define FF_BUG_NO_PADDING 16
1414 #define FF_BUG_AMV 32
1415 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1416 #define FF_BUG_QPEL_CHROMA 64
1417 #define FF_BUG_STD_QPEL 128
1418 #define FF_BUG_QPEL_CHROMA2 256
1419 #define FF_BUG_DIRECT_BLOCKSIZE 512
1420 #define FF_BUG_EDGE 1024
1421 #define FF_BUG_HPEL_CHROMA 2048
1422 #define FF_BUG_DC_CLIP 4096
1423 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1424 #define FF_BUG_TRUNCATED 16384
1425 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1428 * luma single coefficient elimination threshold
1429 * - encoding: Set by user.
1430 * - decoding: unused
1432 int luma_elim_threshold;
1435 * chroma single coeff elimination threshold
1436 * - encoding: Set by user.
1437 * - decoding: unused
1439 int chroma_elim_threshold;
1442 * strictly follow the standard (MPEG4, ...).
1443 * - encoding: Set by user.
1444 * - decoding: Set by user.
1445 * Setting this to STRICT or higher means the encoder and decoder will
1446 * generally do stupid things, whereas setting it to unofficial or lower
1447 * will mean the encoder might produce output that is not supported by all
1448 * spec-compliant decoders. Decoders don't differentiate between normal,
1449 * unofficial and experimental (that is, they always try to decode things
1450 * when they can) unless they are explicitly asked to behave stupidly
1451 * (=strictly conform to the specs)
1453 int strict_std_compliance;
1454 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
1455 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1456 #define FF_COMPLIANCE_NORMAL 0
1457 #if FF_API_INOFFICIAL
1458 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions (deprecated - use FF_COMPLIANCE_UNOFFICIAL instead).
1460 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
1461 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1464 * qscale offset between IP and B-frames
1465 * - encoding: Set by user.
1466 * - decoding: unused
1468 float b_quant_offset;
1471 * Error recognization; higher values will detect more errors but may
1472 * misdetect some more or less valid parts as errors.
1473 * - encoding: unused
1474 * - decoding: Set by user.
1476 int error_recognition;
1477 #define FF_ER_CAREFUL 1
1478 #define FF_ER_COMPLIANT 2
1479 #define FF_ER_AGGRESSIVE 3
1480 #define FF_ER_VERY_AGGRESSIVE 4
1483 * Called at the beginning of each frame to get a buffer for it.
1484 * If pic.reference is set then the frame will be read later by libavcodec.
1485 * avcodec_align_dimensions2() should be used to find the required width and
1486 * height, as they normally need to be rounded up to the next multiple of 16.
1487 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1488 * avcodec_default_get_buffer() instead of providing buffers allocated by
1490 * If frame multithreading is used and thread_safe_callbacks is set,
1491 * it may be called from a different thread, but not from more than one at once.
1492 * Does not need to be reentrant.
1493 * - encoding: unused
1494 * - decoding: Set by libavcodec, user can override.
1496 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1499 * Called to release buffers which were allocated with get_buffer.
1500 * A released buffer can be reused in get_buffer().
1501 * pic.data[*] must be set to NULL.
1502 * May be called from a different thread if frame multithreading is used,
1503 * but not by more than one thread at once, so does not need to be reentrant.
1504 * - encoding: unused
1505 * - decoding: Set by libavcodec, user can override.
1507 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1510 * Size of the frame reordering buffer in the decoder.
1511 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1512 * - encoding: Set by libavcodec.
1513 * - decoding: Set by libavcodec.
1518 * number of bytes per packet if constant and known or 0
1519 * Used by some WAV based audio codecs.
1523 int parse_only; /* - decoding only: If true, only parsing is done
1524 (function avcodec_parse_frame()). The frame
1525 data is returned. Only MPEG codecs support this now. */
1528 * 0-> h263 quant 1-> mpeg quant
1529 * - encoding: Set by user.
1530 * - decoding: unused
1535 * pass1 encoding statistics output buffer
1536 * - encoding: Set by libavcodec.
1537 * - decoding: unused
1542 * pass2 encoding statistics input buffer
1543 * Concatenated stuff from stats_out of pass1 should be placed here.
1544 * - encoding: Allocated/set/freed by user.
1545 * - decoding: unused
1550 * ratecontrol qmin qmax limiting method
1551 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1552 * - encoding: Set by user.
1553 * - decoding: unused
1561 * ratecontrol override, see RcOverride
1562 * - encoding: Allocated/set/freed by user.
1563 * - decoding: unused
1565 RcOverride *rc_override;
1566 int rc_override_count;
1569 * rate control equation
1570 * - encoding: Set by user
1571 * - decoding: unused
1577 * - encoding: Set by user.
1578 * - decoding: unused
1584 * - encoding: Set by user.
1585 * - decoding: unused
1590 * decoder bitstream buffer size
1591 * - encoding: Set by user.
1592 * - decoding: unused
1595 float rc_buffer_aggressivity;
1598 * qscale factor between P and I-frames
1599 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1600 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1601 * - encoding: Set by user.
1602 * - decoding: unused
1604 float i_quant_factor;
1607 * qscale offset between P and I-frames
1608 * - encoding: Set by user.
1609 * - decoding: unused
1611 float i_quant_offset;
1614 * initial complexity for pass1 ratecontrol
1615 * - encoding: Set by user.
1616 * - decoding: unused
1618 float rc_initial_cplx;
1621 * DCT algorithm, see FF_DCT_* below
1622 * - encoding: Set by user.
1623 * - decoding: unused
1626 #define FF_DCT_AUTO 0
1627 #define FF_DCT_FASTINT 1
1628 #define FF_DCT_INT 2
1629 #define FF_DCT_MMX 3
1630 #define FF_DCT_MLIB 4
1631 #define FF_DCT_ALTIVEC 5
1632 #define FF_DCT_FAAN 6
1635 * luminance masking (0-> disabled)
1636 * - encoding: Set by user.
1637 * - decoding: unused
1642 * temporary complexity masking (0-> disabled)
1643 * - encoding: Set by user.
1644 * - decoding: unused
1646 float temporal_cplx_masking;
1649 * spatial complexity masking (0-> disabled)
1650 * - encoding: Set by user.
1651 * - decoding: unused
1653 float spatial_cplx_masking;
1656 * p block masking (0-> disabled)
1657 * - encoding: Set by user.
1658 * - decoding: unused
1663 * darkness masking (0-> disabled)
1664 * - encoding: Set by user.
1665 * - decoding: unused
1670 * IDCT algorithm, see FF_IDCT_* below.
1671 * - encoding: Set by user.
1672 * - decoding: Set by user.
1675 #define FF_IDCT_AUTO 0
1676 #define FF_IDCT_INT 1
1677 #define FF_IDCT_SIMPLE 2
1678 #define FF_IDCT_SIMPLEMMX 3
1679 #define FF_IDCT_LIBMPEG2MMX 4
1680 #define FF_IDCT_PS2 5
1681 #define FF_IDCT_MLIB 6
1682 #define FF_IDCT_ARM 7
1683 #define FF_IDCT_ALTIVEC 8
1684 #define FF_IDCT_SH4 9
1685 #define FF_IDCT_SIMPLEARM 10
1686 #define FF_IDCT_H264 11
1687 #define FF_IDCT_VP3 12
1688 #define FF_IDCT_IPP 13
1689 #define FF_IDCT_XVIDMMX 14
1690 #define FF_IDCT_CAVS 15
1691 #define FF_IDCT_SIMPLEARMV5TE 16
1692 #define FF_IDCT_SIMPLEARMV6 17
1693 #define FF_IDCT_SIMPLEVIS 18
1694 #define FF_IDCT_WMV2 19
1695 #define FF_IDCT_FAAN 20
1696 #define FF_IDCT_EA 21
1697 #define FF_IDCT_SIMPLENEON 22
1698 #define FF_IDCT_SIMPLEALPHA 23
1699 #define FF_IDCT_BINK 24
1703 * - encoding: Set by libavcodec.
1704 * - decoding: Set by user (or 0).
1708 * slice offsets in the frame in bytes
1709 * - encoding: Set/allocated by libavcodec.
1710 * - decoding: Set/allocated by user (or NULL).
1715 * error concealment flags
1716 * - encoding: unused
1717 * - decoding: Set by user.
1719 int error_concealment;
1720 #define FF_EC_GUESS_MVS 1
1721 #define FF_EC_DEBLOCK 2
1724 * dsp_mask could be add used to disable unwanted CPU features
1725 * CPU features (i.e. MMX, SSE. ...)
1727 * With the FORCE flag you may instead enable given CPU features.
1728 * (Dangerous: Usable in case of misdetection, improper usage however will
1729 * result into program crash.)
1734 #define FF_MM_FORCE AV_CPU_FLAG_FORCE
1735 #define FF_MM_MMX AV_CPU_FLAG_MMX
1736 #define FF_MM_3DNOW AV_CPU_FLAG_3DNOW
1737 #define FF_MM_MMXEXT AV_CPU_FLAG_MMX2
1738 #define FF_MM_MMX2 AV_CPU_FLAG_MMX2
1739 #define FF_MM_SSE AV_CPU_FLAG_SSE
1740 #define FF_MM_SSE2 AV_CPU_FLAG_SSE2
1741 #define FF_MM_SSE2SLOW AV_CPU_FLAG_SSE2SLOW
1742 #define FF_MM_3DNOWEXT AV_CPU_FLAG_3DNOWEXT
1743 #define FF_MM_SSE3 AV_CPU_FLAG_SSE3
1744 #define FF_MM_SSE3SLOW AV_CPU_FLAG_SSE3SLOW
1745 #define FF_MM_SSSE3 AV_CPU_FLAG_SSSE3
1746 #define FF_MM_SSE4 AV_CPU_FLAG_SSE4
1747 #define FF_MM_SSE42 AV_CPU_FLAG_SSE42
1748 #define FF_MM_IWMMXT AV_CPU_FLAG_IWMMXT
1749 #define FF_MM_ALTIVEC AV_CPU_FLAG_ALTIVEC
1753 * bits per sample/pixel from the demuxer (needed for huffyuv).
1754 * - encoding: Set by libavcodec.
1755 * - decoding: Set by user.
1757 int bits_per_coded_sample;
1760 * prediction method (needed for huffyuv)
1761 * - encoding: Set by user.
1762 * - decoding: unused
1764 int prediction_method;
1765 #define FF_PRED_LEFT 0
1766 #define FF_PRED_PLANE 1
1767 #define FF_PRED_MEDIAN 2
1770 * sample aspect ratio (0 if unknown)
1771 * That is the width of a pixel divided by the height of the pixel.
1772 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1773 * - encoding: Set by user.
1774 * - decoding: Set by libavcodec.
1776 AVRational sample_aspect_ratio;
1779 * the picture in the bitstream
1780 * - encoding: Set by libavcodec.
1781 * - decoding: Set by libavcodec.
1783 AVFrame *coded_frame;
1787 * - encoding: Set by user.
1788 * - decoding: Set by user.
1791 #define FF_DEBUG_PICT_INFO 1
1792 #define FF_DEBUG_RC 2
1793 #define FF_DEBUG_BITSTREAM 4
1794 #define FF_DEBUG_MB_TYPE 8
1795 #define FF_DEBUG_QP 16
1796 #define FF_DEBUG_MV 32
1797 #define FF_DEBUG_DCT_COEFF 0x00000040
1798 #define FF_DEBUG_SKIP 0x00000080
1799 #define FF_DEBUG_STARTCODE 0x00000100
1800 #define FF_DEBUG_PTS 0x00000200
1801 #define FF_DEBUG_ER 0x00000400
1802 #define FF_DEBUG_MMCO 0x00000800
1803 #define FF_DEBUG_BUGS 0x00001000
1804 #define FF_DEBUG_VIS_QP 0x00002000
1805 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1806 #define FF_DEBUG_BUFFERS 0x00008000
1807 #define FF_DEBUG_THREADS 0x00010000
1811 * - encoding: Set by user.
1812 * - decoding: Set by user.
1815 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1816 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1817 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1821 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1822 * - decoding: unused
1827 * minimum MB quantizer
1828 * - encoding: unused
1829 * - decoding: unused
1834 * maximum MB quantizer
1835 * - encoding: unused
1836 * - decoding: unused
1841 * motion estimation comparison function
1842 * - encoding: Set by user.
1843 * - decoding: unused
1847 * subpixel motion estimation comparison function
1848 * - encoding: Set by user.
1849 * - decoding: unused
1853 * macroblock comparison function (not supported yet)
1854 * - encoding: Set by user.
1855 * - decoding: unused
1859 * interlaced DCT comparison function
1860 * - encoding: Set by user.
1861 * - decoding: unused
1864 #define FF_CMP_SAD 0
1865 #define FF_CMP_SSE 1
1866 #define FF_CMP_SATD 2
1867 #define FF_CMP_DCT 3
1868 #define FF_CMP_PSNR 4
1869 #define FF_CMP_BIT 5
1871 #define FF_CMP_ZERO 7
1872 #define FF_CMP_VSAD 8
1873 #define FF_CMP_VSSE 9
1874 #define FF_CMP_NSSE 10
1875 #define FF_CMP_W53 11
1876 #define FF_CMP_W97 12
1877 #define FF_CMP_DCTMAX 13
1878 #define FF_CMP_DCT264 14
1879 #define FF_CMP_CHROMA 256
1882 * ME diamond size & shape
1883 * - encoding: Set by user.
1884 * - decoding: unused
1889 * amount of previous MV predictors (2a+1 x 2a+1 square)
1890 * - encoding: Set by user.
1891 * - decoding: unused
1893 int last_predictor_count;
1896 * prepass for motion estimation
1897 * - encoding: Set by user.
1898 * - decoding: unused
1903 * motion estimation prepass comparison function
1904 * - encoding: Set by user.
1905 * - decoding: unused
1910 * ME prepass diamond size & shape
1911 * - encoding: Set by user.
1912 * - decoding: unused
1918 * - encoding: Set by user.
1919 * - decoding: unused
1921 int me_subpel_quality;
1924 * callback to negotiate the pixelFormat
1925 * @param fmt is the list of formats which are supported by the codec,
1926 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1927 * The first is always the native one.
1928 * @return the chosen format
1929 * - encoding: unused
1930 * - decoding: Set by user, if not set the native format will be chosen.
1932 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1935 * DTG active format information (additional aspect ratio
1936 * information only used in DVB MPEG-2 transport streams)
1939 * - encoding: unused
1940 * - decoding: Set by decoder.
1942 int dtg_active_format;
1943 #define FF_DTG_AFD_SAME 8
1944 #define FF_DTG_AFD_4_3 9
1945 #define FF_DTG_AFD_16_9 10
1946 #define FF_DTG_AFD_14_9 11
1947 #define FF_DTG_AFD_4_3_SP_14_9 13
1948 #define FF_DTG_AFD_16_9_SP_14_9 14
1949 #define FF_DTG_AFD_SP_4_3 15
1952 * maximum motion estimation search range in subpel units
1953 * If 0 then no limit.
1955 * - encoding: Set by user.
1956 * - decoding: unused
1961 * intra quantizer bias
1962 * - encoding: Set by user.
1963 * - decoding: unused
1965 int intra_quant_bias;
1966 #define FF_DEFAULT_QUANT_BIAS 999999
1969 * inter quantizer bias
1970 * - encoding: Set by user.
1971 * - decoding: unused
1973 int inter_quant_bias;
1977 * - encoding: unused
1978 * - decoding: Which clrtable should be used for 8bit RGB images.
1979 * Tables have to be stored somewhere. FIXME
1984 * internal_buffer count
1985 * Don't touch, used by libavcodec default_get_buffer().
1987 int internal_buffer_count;
1991 * Don't touch, used by libavcodec default_get_buffer().
1993 void *internal_buffer;
1996 * Global quality for codecs which cannot change it per frame.
1997 * This should be proportional to MPEG-1/2/4 qscale.
1998 * - encoding: Set by user.
1999 * - decoding: unused
2003 #define FF_CODER_TYPE_VLC 0
2004 #define FF_CODER_TYPE_AC 1
2005 #define FF_CODER_TYPE_RAW 2
2006 #define FF_CODER_TYPE_RLE 3
2007 #define FF_CODER_TYPE_DEFLATE 4
2010 * - encoding: Set by user.
2011 * - decoding: unused
2017 * - encoding: Set by user.
2018 * - decoding: unused
2024 * - encoding: unused
2025 * - decoding: Set by user.
2027 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
2032 * - encoding: unused
2033 * - decoding: Set by user.
2036 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2037 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
2038 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2041 * XVideo Motion Acceleration
2042 * - encoding: forbidden
2043 * - decoding: set by decoder
2045 int xvmc_acceleration;
2048 * macroblock decision mode
2049 * - encoding: Set by user.
2050 * - decoding: unused
2053 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2054 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2055 #define FF_MB_DECISION_RD 2 ///< rate distortion
2058 * custom intra quantization matrix
2059 * - encoding: Set by user, can be NULL.
2060 * - decoding: Set by libavcodec.
2062 uint16_t *intra_matrix;
2065 * custom inter quantization matrix
2066 * - encoding: Set by user, can be NULL.
2067 * - decoding: Set by libavcodec.
2069 uint16_t *inter_matrix;
2072 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
2073 * This is used to work around some encoder bugs.
2074 * - encoding: unused
2075 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
2077 unsigned int stream_codec_tag;
2080 * scene change detection threshold
2081 * 0 is default, larger means fewer detected scene changes.
2082 * - encoding: Set by user.
2083 * - decoding: unused
2085 int scenechange_threshold;
2088 * minimum Lagrange multipler
2089 * - encoding: Set by user.
2090 * - decoding: unused
2095 * maximum Lagrange multipler
2096 * - encoding: Set by user.
2097 * - decoding: unused
2101 #if FF_API_PALETTE_CONTROL
2103 * palette control structure
2104 * - encoding: ??? (no palette-enabled encoder yet)
2105 * - decoding: Set by user.
2107 struct AVPaletteControl *palctrl;
2111 * noise reduction strength
2112 * - encoding: Set by user.
2113 * - decoding: unused
2115 int noise_reduction;
2118 * Called at the beginning of a frame to get cr buffer for it.
2119 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2120 * libavcodec will pass previous buffer in pic, function should return
2121 * same buffer or new buffer with old frame "painted" into it.
2122 * If pic.data[0] == NULL must behave like get_buffer().
2123 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2124 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2126 * - encoding: unused
2127 * - decoding: Set by libavcodec, user can override.
2129 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2132 * Number of bits which should be loaded into the rc buffer before decoding starts.
2133 * - encoding: Set by user.
2134 * - decoding: unused
2136 int rc_initial_buffer_occupancy;
2140 * - encoding: Set by user.
2141 * - decoding: unused
2143 int inter_threshold;
2147 * - encoding: Set by user.
2148 * - decoding: Set by user.
2153 * Simulates errors in the bitstream to test error concealment.
2154 * - encoding: Set by user.
2155 * - decoding: unused
2160 * MP3 antialias algorithm, see FF_AA_* below.
2161 * - encoding: unused
2162 * - decoding: Set by user.
2165 #define FF_AA_AUTO 0
2166 #define FF_AA_FASTINT 1 //not implemented yet
2168 #define FF_AA_FLOAT 3
2170 * quantizer noise shaping
2171 * - encoding: Set by user.
2172 * - decoding: unused
2174 int quantizer_noise_shaping;
2178 * is used to decide how many independent tasks should be passed to execute()
2179 * - encoding: Set by user.
2180 * - decoding: Set by user.
2185 * The codec may call this to execute several independent things.
2186 * It will return only after finishing all tasks.
2187 * The user may replace this with some multithreaded implementation,
2188 * the default implementation will execute the parts serially.
2189 * @param count the number of things to execute
2190 * - encoding: Set by libavcodec, user can override.
2191 * - decoding: Set by libavcodec, user can override.
2193 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2197 * Can be used by execute() to store some per AVCodecContext stuff.
2198 * - encoding: set by execute()
2199 * - decoding: set by execute()
2201 void *thread_opaque;
2204 * Motion estimation threshold below which no motion estimation is
2205 * performed, but instead the user specified motion vectors are used.
2207 * - encoding: Set by user.
2208 * - decoding: unused
2213 * Macroblock threshold below which the user specified macroblock types will be used.
2214 * - encoding: Set by user.
2215 * - decoding: unused
2220 * precision of the intra DC coefficient - 8
2221 * - encoding: Set by user.
2222 * - decoding: unused
2224 int intra_dc_precision;
2227 * noise vs. sse weight for the nsse comparsion function
2228 * - encoding: Set by user.
2229 * - decoding: unused
2234 * Number of macroblock rows at the top which are skipped.
2235 * - encoding: unused
2236 * - decoding: Set by user.
2241 * Number of macroblock rows at the bottom which are skipped.
2242 * - encoding: unused
2243 * - decoding: Set by user.
2249 * - encoding: Set by user.
2250 * - decoding: Set by libavcodec.
2253 #define FF_PROFILE_UNKNOWN -99
2254 #define FF_PROFILE_RESERVED -100
2256 #define FF_PROFILE_AAC_MAIN 0
2257 #define FF_PROFILE_AAC_LOW 1
2258 #define FF_PROFILE_AAC_SSR 2
2259 #define FF_PROFILE_AAC_LTP 3
2261 #define FF_PROFILE_DTS 20
2262 #define FF_PROFILE_DTS_ES 30
2263 #define FF_PROFILE_DTS_96_24 40
2264 #define FF_PROFILE_DTS_HD_HRA 50
2265 #define FF_PROFILE_DTS_HD_MA 60
2267 #define FF_PROFILE_MPEG2_422 0
2268 #define FF_PROFILE_MPEG2_HIGH 1
2269 #define FF_PROFILE_MPEG2_SS 2
2270 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2271 #define FF_PROFILE_MPEG2_MAIN 4
2272 #define FF_PROFILE_MPEG2_SIMPLE 5
2274 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2275 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2277 #define FF_PROFILE_H264_BASELINE 66
2278 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2279 #define FF_PROFILE_H264_MAIN 77
2280 #define FF_PROFILE_H264_EXTENDED 88
2281 #define FF_PROFILE_H264_HIGH 100
2282 #define FF_PROFILE_H264_HIGH_10 110
2283 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2284 #define FF_PROFILE_H264_HIGH_422 122
2285 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2286 #define FF_PROFILE_H264_HIGH_444 144
2287 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2288 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2289 #define FF_PROFILE_H264_CAVLC_444 44
2291 #define FF_PROFILE_VC1_SIMPLE 0
2292 #define FF_PROFILE_VC1_MAIN 1
2293 #define FF_PROFILE_VC1_COMPLEX 2
2294 #define FF_PROFILE_VC1_ADVANCED 3
2298 * - encoding: Set by user.
2299 * - decoding: Set by libavcodec.
2302 #define FF_LEVEL_UNKNOWN -99
2305 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2306 * - encoding: unused
2307 * - decoding: Set by user.
2312 * Bitstream width / height, may be different from width/height if lowres
2313 * or other things are used.
2314 * - encoding: unused
2315 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
2317 int coded_width, coded_height;
2320 * frame skip threshold
2321 * - encoding: Set by user.
2322 * - decoding: unused
2324 int frame_skip_threshold;
2328 * - encoding: Set by user.
2329 * - decoding: unused
2331 int frame_skip_factor;
2334 * frame skip exponent
2335 * - encoding: Set by user.
2336 * - decoding: unused
2341 * frame skip comparison function
2342 * - encoding: Set by user.
2343 * - decoding: unused
2348 * Border processing masking, raises the quantizer for mbs on the borders
2350 * - encoding: Set by user.
2351 * - decoding: unused
2353 float border_masking;
2356 * minimum MB lagrange multipler
2357 * - encoding: Set by user.
2358 * - decoding: unused
2363 * maximum MB lagrange multipler
2364 * - encoding: Set by user.
2365 * - decoding: unused
2371 * - encoding: Set by user.
2372 * - decoding: unused
2374 int me_penalty_compensation;
2378 * - encoding: unused
2379 * - decoding: Set by user.
2381 enum AVDiscard skip_loop_filter;
2385 * - encoding: unused
2386 * - decoding: Set by user.
2388 enum AVDiscard skip_idct;
2392 * - encoding: unused
2393 * - decoding: Set by user.
2395 enum AVDiscard skip_frame;
2399 * - encoding: Set by user.
2400 * - decoding: unused
2406 * - encoding: Set by user.
2407 * - decoding: unused
2412 * constant rate factor - quality-based VBR - values ~correspond to qps
2413 * - encoding: Set by user.
2414 * - decoding: unused
2419 * constant quantization parameter rate control method
2420 * - encoding: Set by user.
2421 * - decoding: unused
2427 * - encoding: Set by user.
2428 * - decoding: unused
2433 * number of reference frames
2434 * - encoding: Set by user.
2435 * - decoding: Set by lavc.
2440 * chroma qp offset from luma
2441 * - encoding: Set by user.
2442 * - decoding: unused
2447 * Influences how often B-frames are used.
2448 * - encoding: Set by user.
2449 * - decoding: unused
2454 * trellis RD quantization
2455 * - encoding: Set by user.
2456 * - decoding: unused
2461 * Reduce fluctuations in qp (before curve compression).
2462 * - encoding: Set by user.
2463 * - decoding: unused
2465 float complexityblur;
2468 * in-loop deblocking filter alphac0 parameter
2469 * alpha is in the range -6...6
2470 * - encoding: Set by user.
2471 * - decoding: unused
2476 * in-loop deblocking filter beta parameter
2477 * beta is in the range -6...6
2478 * - encoding: Set by user.
2479 * - decoding: unused
2484 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2485 * - encoding: Set by user.
2486 * - decoding: unused
2489 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2490 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2491 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2492 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2493 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2496 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal), 3 (auto)
2497 * - encoding: Set by user.
2498 * - decoding: unused
2503 * Audio cutoff bandwidth (0 means "automatic")
2504 * - encoding: Set by user.
2505 * - decoding: unused
2510 * Multiplied by qscale for each frame and added to scene_change_score.
2511 * - encoding: Set by user.
2512 * - decoding: unused
2514 int scenechange_factor;
2518 * Note: Value depends upon the compare function used for fullpel ME.
2519 * - encoding: Set by user.
2520 * - decoding: unused
2525 * Adjusts sensitivity of b_frame_strategy 1.
2526 * - encoding: Set by user.
2527 * - decoding: unused
2532 * - encoding: Set by user.
2533 * - decoding: unused
2535 int compression_level;
2536 #define FF_COMPRESSION_DEFAULT -1
2540 * Sets whether to use LPC mode - used by FLAC encoder.
2541 * - encoding: Set by user.
2542 * - decoding: unused
2543 * @deprecated Deprecated in favor of lpc_type and lpc_passes.
2549 * LPC coefficient precision - used by FLAC encoder
2550 * - encoding: Set by user.
2551 * - decoding: unused
2553 int lpc_coeff_precision;
2556 * - encoding: Set by user.
2557 * - decoding: unused
2559 int min_prediction_order;
2562 * - encoding: Set by user.
2563 * - decoding: unused
2565 int max_prediction_order;
2568 * search method for selecting prediction order
2569 * - encoding: Set by user.
2570 * - decoding: unused
2572 int prediction_order_method;
2575 * - encoding: Set by user.
2576 * - decoding: unused
2578 int min_partition_order;
2581 * - encoding: Set by user.
2582 * - decoding: unused
2584 int max_partition_order;
2587 * GOP timecode frame start number, in non drop frame format
2588 * - encoding: Set by user.
2589 * - decoding: unused
2591 int64_t timecode_frame_start;
2593 #if LIBAVCODEC_VERSION_MAJOR < 53
2595 * Decoder should decode to this many channels if it can (0 for default)
2596 * - encoding: unused
2597 * - decoding: Set by user.
2598 * @deprecated Deprecated in favor of request_channel_layout.
2600 int request_channels;
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.
2612 * opaque 64bit number (generally a PTS) that will be reordered and
2613 * output in AVFrame.reordered_opaque
2614 * @deprecated in favor of pkt_pts
2615 * - encoding: unused
2616 * - decoding: Set by user.
2618 int64_t reordered_opaque;
2621 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2622 * This field is applicable only when sample_fmt is AV_SAMPLE_FMT_S32.
2623 * - encoding: set by user.
2624 * - decoding: set by libavcodec.
2626 int bits_per_raw_sample;
2629 * Audio channel layout.
2630 * - encoding: set by user.
2631 * - decoding: set by libavcodec.
2633 int64_t channel_layout;
2636 * Request decoder to use this channel layout if it can (0 for default)
2637 * - encoding: unused
2638 * - decoding: Set by user.
2640 int64_t request_channel_layout;
2643 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2644 * - encoding: Set by user.
2645 * - decoding: unused.
2647 float rc_max_available_vbv_use;
2650 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2651 * - encoding: Set by user.
2652 * - decoding: unused.
2654 float rc_min_vbv_overflow_use;
2657 * Hardware accelerator in use
2658 * - encoding: unused.
2659 * - decoding: Set by libavcodec
2661 struct AVHWAccel *hwaccel;
2664 * For some codecs, the time base is closer to the field rate than the frame rate.
2665 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
2666 * if no telecine is used ...
2668 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
2670 int ticks_per_frame;
2673 * Hardware accelerator context.
2674 * For some hardware accelerators, a global context needs to be
2675 * provided by the user. In that case, this holds display-dependent
2676 * data FFmpeg cannot instantiate itself. Please refer to the
2677 * FFmpeg HW accelerator documentation to know how to fill this
2678 * is. e.g. for VA API, this is a struct vaapi_context.
2679 * - encoding: unused
2680 * - decoding: Set by user
2682 void *hwaccel_context;
2685 * Chromaticity coordinates of the source primaries.
2686 * - encoding: Set by user
2687 * - decoding: Set by libavcodec
2689 enum AVColorPrimaries color_primaries;
2692 * Color Transfer Characteristic.
2693 * - encoding: Set by user
2694 * - decoding: Set by libavcodec
2696 enum AVColorTransferCharacteristic color_trc;
2699 * YUV colorspace type.
2700 * - encoding: Set by user
2701 * - decoding: Set by libavcodec
2703 enum AVColorSpace colorspace;
2706 * MPEG vs JPEG YUV range.
2707 * - encoding: Set by user
2708 * - decoding: Set by libavcodec
2710 enum AVColorRange color_range;
2713 * This defines the location of chroma samples.
2714 * - encoding: Set by user
2715 * - decoding: Set by libavcodec
2717 enum AVChromaLocation chroma_sample_location;
2720 * The codec may call this to execute several independent things.
2721 * It will return only after finishing all tasks.
2722 * The user may replace this with some multithreaded implementation,
2723 * the default implementation will execute the parts serially.
2724 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2725 * @param c context passed also to func
2726 * @param count the number of things to execute
2727 * @param arg2 argument passed unchanged to func
2728 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2729 * @param func function that will be called count times, with jobnr from 0 to count-1.
2730 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2731 * two instances of func executing at the same time will have the same threadnr.
2732 * @return always 0 currently, but code should handle a future improvement where when any call to func
2733 * returns < 0 no further calls to func may be done and < 0 is returned.
2734 * - encoding: Set by libavcodec, user can override.
2735 * - decoding: Set by libavcodec, user can override.
2737 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2740 * explicit P-frame weighted prediction analysis method
2742 * 1: fast blind weighting (one reference duplicate with -1 offset)
2743 * 2: smart weighting (full fade detection analysis)
2744 * - encoding: Set by user.
2745 * - decoding: unused
2747 int weighted_p_pred;
2752 * 1: Variance AQ (complexity mask)
2753 * 2: Auto-variance AQ (experimental)
2754 * - encoding: Set by user
2755 * - decoding: unused
2761 * Reduces blocking and blurring in flat and textured areas.
2762 * - encoding: Set by user
2763 * - decoding: unused
2769 * Strength of psychovisual optimization
2770 * - encoding: Set by user
2771 * - decoding: unused
2777 * Strength of psychovisual optimization
2778 * - encoding: Set by user
2779 * - decoding: unused
2785 * Number of frames for frametype and ratecontrol lookahead
2786 * - encoding: Set by user
2787 * - decoding: unused
2792 * Constant rate factor maximum
2793 * With CRF encoding mode and VBV restrictions enabled, prevents quality from being worse
2794 * than crf_max, even if doing so would violate VBV restrictions.
2795 * - encoding: Set by user.
2796 * - decoding: unused
2800 int log_level_offset;
2803 * Determines which LPC analysis algorithm to use.
2804 * - encoding: Set by user
2805 * - decoding: unused
2807 enum AVLPCType lpc_type;
2810 * Number of passes to use for Cholesky factorization during LPC analysis
2811 * - encoding: Set by user
2812 * - decoding: unused
2818 * Indicates number of picture subdivisions. Used for parallelized
2820 * - encoding: Set by user
2821 * - decoding: unused
2826 * Header containing style information for text subtitles.
2827 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2828 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2829 * the Format line following. It shouldn't include any Dialogue line.
2830 * - encoding: Set/allocated/freed by user (before avcodec_open())
2831 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open())
2833 uint8_t *subtitle_header;
2834 int subtitle_header_size;
2837 * Current packet as passed into the decoder, to avoid having
2838 * to pass the packet into every function. Currently only valid
2839 * inside lavc and get/release_buffer callbacks.
2840 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2841 * - encoding: unused
2846 * Whether this is a copy of the context which had init() called on it.
2847 * This is used by multithreading - shared tables and picture pointers
2848 * should be freed from the original context only.
2849 * - encoding: Set by libavcodec.
2850 * - decoding: Set by libavcodec.
2855 * Which multithreading methods to use.
2856 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2857 * so clients which cannot provide future frames should not use it.
2859 * - encoding: Set by user, otherwise the default is used.
2860 * - decoding: Set by user, otherwise the default is used.
2863 #define FF_THREAD_FRAME 1 //< Decode more than one frame at once
2864 #define FF_THREAD_SLICE 2 //< Decode more than one part of a single frame at once
2867 * Which multithreading methods are in use by the codec.
2868 * - encoding: Set by libavcodec.
2869 * - decoding: Set by libavcodec.
2871 int active_thread_type;
2874 * Set by the client if its custom get_buffer() callback can be called
2875 * from another thread, which allows faster multithreaded decoding.
2876 * draw_horiz_band() will be called from other threads regardless of this setting.
2877 * Ignored if the default get_buffer() is used.
2878 * - encoding: Set by user.
2879 * - decoding: Set by user.
2881 int thread_safe_callbacks;
2884 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2885 * Used for compliant TS muxing.
2886 * - encoding: Set by libavcodec.
2887 * - decoding: unused.
2892 * Type of service that the audio stream conveys.
2893 * - encoding: Set by user.
2894 * - decoding: Set by libavcodec.
2896 enum AVAudioServiceType audio_service_type;
2899 * Current statistics for PTS correction.
2900 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
2901 * - encoding: unused
2903 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
2904 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
2905 int64_t pts_correction_last_pts; /// PTS of the last frame
2906 int64_t pts_correction_last_dts; /// DTS of the last frame
2913 typedef struct AVProfile {
2915 const char *name; ///< short name for the profile
2921 typedef struct AVCodec {
2923 * Name of the codec implementation.
2924 * The name is globally unique among encoders and among decoders (but an
2925 * encoder and a decoder can share the same name).
2926 * This is the primary way to find a codec from the user perspective.
2929 enum AVMediaType type;
2932 int (*init)(AVCodecContext *);
2933 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2934 int (*close)(AVCodecContext *);
2935 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2937 * Codec capabilities.
2941 struct AVCodec *next;
2944 * Will be called when seeking
2946 void (*flush)(AVCodecContext *);
2947 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2948 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2950 * Descriptive name for the codec, meant to be more human readable than name.
2951 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2953 const char *long_name;
2954 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2955 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2956 const int64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2957 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2959 AVClass *priv_class; ///< AVClass for the private context
2961 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2964 * @defgroup framethreading Frame-level threading support functions.
2968 * If defined, called on thread contexts when they are created.
2969 * If the codec allocates writable tables in init(), re-allocate them here.
2970 * priv_data will be set to a copy of the original.
2972 int (*init_thread_copy)(AVCodecContext *);
2974 * Copy necessary context variables from a previous thread context to the current one.
2975 * If not defined, the next thread will start automatically; otherwise, the codec
2976 * must call ff_thread_finish_setup().
2978 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2980 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2987 typedef struct AVHWAccel {
2989 * Name of the hardware accelerated codec.
2990 * The name is globally unique among encoders and among decoders (but an
2991 * encoder and a decoder can share the same name).
2996 * Type of codec implemented by the hardware accelerator.
2998 * See AVMEDIA_TYPE_xxx
3000 enum AVMediaType type;
3003 * Codec implemented by the hardware accelerator.
3010 * Supported pixel format.
3012 * Only hardware accelerated formats are supported here.
3014 enum PixelFormat pix_fmt;
3017 * Hardware accelerated codec capabilities.
3018 * see FF_HWACCEL_CODEC_CAP_*
3022 struct AVHWAccel *next;
3025 * Called at the beginning of each frame or field picture.
3027 * Meaningful frame information (codec specific) is guaranteed to
3028 * be parsed at this point. This function is mandatory.
3030 * Note that buf can be NULL along with buf_size set to 0.
3031 * Otherwise, this means the whole frame is available at this point.
3033 * @param avctx the codec context
3034 * @param buf the frame data buffer base
3035 * @param buf_size the size of the frame in bytes
3036 * @return zero if successful, a negative value otherwise
3038 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3041 * Callback for each slice.
3043 * Meaningful slice information (codec specific) is guaranteed to
3044 * be parsed at this point. This function is mandatory.
3046 * @param avctx the codec context
3047 * @param buf the slice data buffer base
3048 * @param buf_size the size of the slice in bytes
3049 * @return zero if successful, a negative value otherwise
3051 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3054 * Called at the end of each frame or field picture.
3056 * The whole picture is parsed at this point and can now be sent
3057 * to the hardware accelerator. This function is mandatory.
3059 * @param avctx the codec context
3060 * @return zero if successful, a negative value otherwise
3062 int (*end_frame)(AVCodecContext *avctx);
3065 * Size of HW accelerator private data.
3067 * Private data is allocated with av_mallocz() before
3068 * AVCodecContext.get_buffer() and deallocated after
3069 * AVCodecContext.release_buffer().
3075 * four components are given, that's all.
3076 * the last component is alpha
3078 typedef struct AVPicture {
3080 int linesize[4]; ///< number of bytes per line
3083 #if FF_API_PALETTE_CONTROL
3086 * This structure defines a method for communicating palette changes
3087 * between and demuxer and a decoder.
3089 * @deprecated Use AVPacket to send palette changes instead.
3090 * This is totally broken.
3092 #define AVPALETTE_SIZE 1024
3093 #define AVPALETTE_COUNT 256
3094 typedef struct AVPaletteControl {
3096 /* Demuxer sets this to 1 to indicate the palette has changed;
3097 * decoder resets to 0. */
3098 int palette_changed;
3100 /* 4-byte ARGB palette entries, stored in native byte order; note that
3101 * the individual palette components should be on a 8-bit scale; if
3102 * the palette data comes from an IBM VGA native format, the component
3103 * data is probably 6 bits in size and needs to be scaled. */
3104 unsigned int palette[AVPALETTE_COUNT];
3106 } AVPaletteControl attribute_deprecated;
3109 enum AVSubtitleType {
3112 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3115 * Plain text, the text field must be set by the decoder and is
3116 * authoritative. ass and pict fields may contain approximations.
3121 * Formatted text, the ass field must be set by the decoder and is
3122 * authoritative. pict and text fields may contain approximations.
3127 typedef struct AVSubtitleRect {
3128 int x; ///< top left corner of pict, undefined when pict is not set
3129 int y; ///< top left corner of pict, undefined when pict is not set
3130 int w; ///< width of pict, undefined when pict is not set
3131 int h; ///< height of pict, undefined when pict is not set
3132 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3135 * data+linesize for the bitmap of this subtitle.
3136 * can be set for text/ass as well once they where rendered
3139 enum AVSubtitleType type;
3141 char *text; ///< 0 terminated plain UTF-8 text
3144 * 0 terminated ASS/SSA compatible event line.
3145 * The pressentation of this is unaffected by the other values in this
3151 typedef struct AVSubtitle {
3152 uint16_t format; /* 0 = graphics */
3153 uint32_t start_display_time; /* relative to packet pts, in ms */
3154 uint32_t end_display_time; /* relative to packet pts, in ms */
3156 AVSubtitleRect **rects;
3157 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3160 /* packet functions */
3163 * @deprecated use NULL instead
3165 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3168 * Default packet destructor.
3170 void av_destruct_packet(AVPacket *pkt);
3173 * Initialize optional fields of a packet with default values.
3177 void av_init_packet(AVPacket *pkt);
3180 * Allocate the payload of a packet and initialize its fields with
3184 * @param size wanted payload size
3185 * @return 0 if OK, AVERROR_xxx otherwise
3187 int av_new_packet(AVPacket *pkt, int size);
3190 * Reduce packet size, correctly zeroing padding
3193 * @param size new size
3195 void av_shrink_packet(AVPacket *pkt, int size);
3198 * Increase packet size, correctly zeroing padding
3201 * @param grow_by number of bytes by which to increase the size of the packet
3203 int av_grow_packet(AVPacket *pkt, int grow_by);
3206 * @warning This is a hack - the packet memory allocation stuff is broken. The
3207 * packet is allocated if it was not really allocated.
3209 int av_dup_packet(AVPacket *pkt);
3214 * @param pkt packet to free
3216 void av_free_packet(AVPacket *pkt);
3220 struct ReSampleContext;
3221 struct AVResampleContext;
3223 typedef struct ReSampleContext ReSampleContext;
3225 #if FF_API_AUDIO_OLD
3227 * @deprecated Use av_audio_resample_init() instead.
3229 attribute_deprecated ReSampleContext *audio_resample_init(int output_channels, int input_channels,
3230 int output_rate, int input_rate);
3234 * Initialize audio resampling context.
3236 * @param output_channels number of output channels
3237 * @param input_channels number of input channels
3238 * @param output_rate output sample rate
3239 * @param input_rate input sample rate
3240 * @param sample_fmt_out requested output sample format
3241 * @param sample_fmt_in input sample format
3242 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3243 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3244 * @param linear if 1 then the used FIR filter will be linearly interpolated
3245 between the 2 closest, if 0 the closest will be used
3246 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3247 * @return allocated ReSampleContext, NULL if error occured
3249 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3250 int output_rate, int input_rate,
3251 enum AVSampleFormat sample_fmt_out,
3252 enum AVSampleFormat sample_fmt_in,
3253 int filter_length, int log2_phase_count,
3254 int linear, double cutoff);
3256 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
3259 * Free resample context.
3261 * @param s a non-NULL pointer to a resample context previously
3262 * created with av_audio_resample_init()
3264 void audio_resample_close(ReSampleContext *s);
3268 * Initialize an audio resampler.
3269 * Note, if either rate is not an integer then simply scale both rates up so they are.
3270 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
3271 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3272 * @param linear If 1 then the used FIR filter will be linearly interpolated
3273 between the 2 closest, if 0 the closest will be used
3274 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3276 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
3279 * Resample an array of samples using a previously configured context.
3280 * @param src an array of unconsumed samples
3281 * @param consumed the number of samples of src which have been consumed are returned here
3282 * @param src_size the number of unconsumed samples available
3283 * @param dst_size the amount of space in samples available in dst
3284 * @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.
3285 * @return the number of samples written in dst or -1 if an error occurred
3287 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
3291 * Compensate samplerate/timestamp drift. The compensation is done by changing
3292 * the resampler parameters, so no audible clicks or similar distortions occur
3293 * @param compensation_distance distance in output samples over which the compensation should be performed
3294 * @param sample_delta number of output samples which should be output less
3296 * example: av_resample_compensate(c, 10, 500)
3297 * here instead of 510 samples only 500 samples would be output
3299 * note, due to rounding the actual compensation might be slightly different,
3300 * especially if the compensation_distance is large and the in_rate used during init is small
3302 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
3303 void av_resample_close(struct AVResampleContext *c);
3306 * Allocate memory for a picture. Call avpicture_free to free it.
3308 * @param picture the picture to be filled in
3309 * @param pix_fmt the format of the picture
3310 * @param width the width of the picture
3311 * @param height the height of the picture
3312 * @return zero if successful, a negative value if not
3314 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
3317 * Free a picture previously allocated by avpicture_alloc().
3319 * @param picture the AVPicture to be freed
3321 void avpicture_free(AVPicture *picture);
3324 * Fill in the AVPicture fields.
3325 * The fields of the given AVPicture are filled in by using the 'ptr' address
3326 * which points to the image data buffer. Depending on the specified picture
3327 * format, one or multiple image data pointers and line sizes will be set.
3328 * If a planar format is specified, several pointers will be set pointing to
3329 * the different picture planes and the line sizes of the different planes
3330 * will be stored in the lines_sizes array.
3331 * Call with ptr == NULL to get the required size for the ptr buffer.
3333 * @param picture AVPicture whose fields are to be filled in
3334 * @param ptr Buffer which will contain or contains the actual image data
3335 * @param pix_fmt The format in which the picture data is stored.
3336 * @param width the width of the image in pixels
3337 * @param height the height of the image in pixels
3338 * @return size of the image data in bytes
3340 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3341 enum PixelFormat pix_fmt, int width, int height);
3342 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
3343 unsigned char *dest, int dest_size);
3346 * Calculate the size in bytes that a picture of the given width and height
3347 * would occupy if stored in the given picture format.
3348 * Note that this returns the size of a compact representation as generated
3349 * by avpicture_layout, which can be smaller than the size required for e.g.
3352 * @param pix_fmt the given picture format
3353 * @param width the width of the image
3354 * @param height the height of the image
3355 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3357 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
3358 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
3359 const char *avcodec_get_pix_fmt_name(enum PixelFormat pix_fmt);
3360 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3362 #if LIBAVCODEC_VERSION_MAJOR < 53
3364 * Return the pixel format corresponding to the name name.
3366 * If there is no pixel format with name name, then look for a
3367 * pixel format with the name corresponding to the native endian
3369 * For example in a little-endian system, first look for "gray16",
3370 * then for "gray16le".
3372 * Finally if no pixel format has been found, return PIX_FMT_NONE.
3374 * @deprecated Deprecated in favor of av_get_pix_fmt().
3376 attribute_deprecated enum PixelFormat avcodec_get_pix_fmt(const char* name);
3380 * Return a value representing the fourCC code associated to the
3381 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3384 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
3387 * Put a string representing the codec tag codec_tag in buf.
3389 * @param buf_size size in bytes of buf
3390 * @return the length of the string that would have been generated if
3391 * enough space had been available, excluding the trailing null
3393 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3395 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3396 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3397 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3398 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3399 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3400 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3403 * Compute what kind of losses will occur when converting from one specific
3404 * pixel format to another.
3405 * When converting from one pixel format to another, information loss may occur.
3406 * For example, when converting from RGB24 to GRAY, the color information will
3407 * be lost. Similarly, other losses occur when converting from some formats to
3408 * other formats. These losses can involve loss of chroma, but also loss of
3409 * resolution, loss of color depth, loss due to the color space conversion, loss
3410 * of the alpha bits or loss due to color quantization.
3411 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3412 * which will occur when converting from one pixel format to another.
3414 * @param[in] dst_pix_fmt destination pixel format
3415 * @param[in] src_pix_fmt source pixel format
3416 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3417 * @return Combination of flags informing you what kind of losses will occur.
3419 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
3423 * Find the best pixel format to convert to given a certain source pixel
3424 * format. When converting from one pixel format to another, information loss
3425 * may occur. For example, when converting from RGB24 to GRAY, the color
3426 * information will be lost. Similarly, other losses occur when converting from
3427 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
3428 * the given pixel formats should be used to suffer the least amount of loss.
3429 * The pixel formats from which it chooses one, are determined by the
3430 * pix_fmt_mask parameter.
3433 * src_pix_fmt = PIX_FMT_YUV420P;
3434 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
3435 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
3438 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
3439 * @param[in] src_pix_fmt source pixel format
3440 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3441 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3442 * @return The best pixel format to convert to or -1 if none was found.
3444 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
3445 int has_alpha, int *loss_ptr);
3447 #if LIBAVCODEC_VERSION_MAJOR < 53
3449 * @deprecated Use av_get_pix_fmt_string() instead.
3451 attribute_deprecated
3452 void avcodec_pix_fmt_string (char *buf, int buf_size, enum PixelFormat pix_fmt);
3455 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
3456 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
3459 * Tell if an image really has transparent alpha values.
3460 * @return ored mask of FF_ALPHA_xxx constants
3462 int img_get_alpha_info(const AVPicture *src,
3463 enum PixelFormat pix_fmt, int width, int height);
3465 /* deinterlace a picture */
3466 /* deinterlace - if not supported return -1 */
3467 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3468 enum PixelFormat pix_fmt, int width, int height);
3470 /* external high level API */
3473 * If c is NULL, returns the first registered codec,
3474 * if c is non-NULL, returns the next registered codec after c,
3475 * or NULL if c is the last one.
3477 AVCodec *av_codec_next(AVCodec *c);
3480 * Return the LIBAVCODEC_VERSION_INT constant.
3482 unsigned avcodec_version(void);
3485 * Return the libavcodec build-time configuration.
3487 const char *avcodec_configuration(void);
3490 * Return the libavcodec license.
3492 const char *avcodec_license(void);
3495 * Initialize libavcodec.
3497 * @warning This function must be called before any other libavcodec
3500 void avcodec_init(void);
3502 #if LIBAVCODEC_VERSION_MAJOR < 53
3504 * @deprecated Deprecated in favor of avcodec_register().
3506 attribute_deprecated void register_avcodec(AVCodec *codec);
3510 * Register the codec codec and initialize libavcodec.
3512 * @see avcodec_init()
3514 void avcodec_register(AVCodec *codec);
3517 * Find a registered encoder with a matching codec ID.
3519 * @param id CodecID of the requested encoder
3520 * @return An encoder if one was found, NULL otherwise.
3522 AVCodec *avcodec_find_encoder(enum CodecID id);
3525 * Find a registered encoder with the specified name.
3527 * @param name name of the requested encoder
3528 * @return An encoder if one was found, NULL otherwise.
3530 AVCodec *avcodec_find_encoder_by_name(const char *name);
3533 * Find a registered decoder with a matching codec ID.
3535 * @param id CodecID of the requested decoder
3536 * @return A decoder if one was found, NULL otherwise.
3538 AVCodec *avcodec_find_decoder(enum CodecID id);
3541 * Find a registered decoder with the specified name.
3543 * @param name name of the requested decoder
3544 * @return A decoder if one was found, NULL otherwise.
3546 AVCodec *avcodec_find_decoder_by_name(const char *name);
3547 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3550 * Return a name for the specified profile, if available.
3552 * @param codec the codec that is searched for the given profile
3553 * @param profile the profile value for which a name is requested
3554 * @return A name for the profile if found, NULL otherwise.
3556 const char *av_get_profile_name(const AVCodec *codec, int profile);
3559 * Set the fields of the given AVCodecContext to default values.
3561 * @param s The AVCodecContext of which the fields should be set to default values.
3563 void avcodec_get_context_defaults(AVCodecContext *s);
3565 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3566 * we WILL change its arguments and name a few times! */
3567 void avcodec_get_context_defaults2(AVCodecContext *s, enum AVMediaType);
3569 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3570 * we WILL change its arguments and name a few times! */
3571 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3574 * Allocate an AVCodecContext and set its fields to default values. The
3575 * resulting struct can be deallocated by simply calling av_free().
3577 * @return An AVCodecContext filled with default values or NULL on failure.
3578 * @see avcodec_get_context_defaults
3580 AVCodecContext *avcodec_alloc_context(void);
3582 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3583 * we WILL change its arguments and name a few times! */
3584 AVCodecContext *avcodec_alloc_context2(enum AVMediaType);
3586 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
3587 * we WILL change its arguments and name a few times! */
3588 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3591 * Copy the settings of the source AVCodecContext into the destination
3592 * AVCodecContext. The resulting destination codec context will be
3593 * unopened, i.e. you are required to call avcodec_open() before you
3594 * can use this AVCodecContext to decode/encode video/audio data.
3596 * @param dest target codec context, should be initialized with
3597 * avcodec_alloc_context(), but otherwise uninitialized
3598 * @param src source codec context
3599 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3601 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3604 * Set the fields of the given AVFrame to default values.
3606 * @param pic The AVFrame of which the fields should be set to default values.
3608 void avcodec_get_frame_defaults(AVFrame *pic);
3611 * Allocate an AVFrame and set its fields to default values. The resulting
3612 * struct can be deallocated by simply calling av_free().
3614 * @return An AVFrame filled with default values or NULL on failure.
3615 * @see avcodec_get_frame_defaults
3617 AVFrame *avcodec_alloc_frame(void);
3619 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3620 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3621 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3624 * Return the amount of padding in pixels which the get_buffer callback must
3625 * provide around the edge of the image for codecs which do not have the
3626 * CODEC_FLAG_EMU_EDGE flag.
3628 * @return Required padding in pixels.
3630 unsigned avcodec_get_edge_width(void);
3632 * Modify width and height values so that they will result in a memory
3633 * buffer that is acceptable for the codec if you do not use any horizontal
3636 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3637 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3638 * according to avcodec_get_edge_width() before.
3640 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3642 * Modify width and height values so that they will result in a memory
3643 * buffer that is acceptable for the codec if you also ensure that all
3644 * line sizes are a multiple of the respective linesize_align[i].
3646 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3647 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3648 * according to avcodec_get_edge_width() before.
3650 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3651 int linesize_align[4]);
3653 #if LIBAVCODEC_VERSION_MAJOR < 53
3655 * @deprecated Deprecated in favor of av_check_image_size().
3657 attribute_deprecated
3658 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
3661 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
3663 #if LIBAVCODEC_VERSION_MAJOR < 53
3665 * @deprecated Set s->thread_count before calling avcodec_open() instead of calling this.
3667 attribute_deprecated
3668 int avcodec_thread_init(AVCodecContext *s, int thread_count);
3669 void avcodec_thread_free(AVCodecContext *s);
3671 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3672 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3673 //FIXME func typedef
3676 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3677 * function the context has to be allocated.
3679 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3680 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3681 * retrieving a codec.
3683 * @warning This function is not thread safe!
3686 * avcodec_register_all();
3687 * codec = avcodec_find_decoder(CODEC_ID_H264);
3691 * context = avcodec_alloc_context();
3693 * if (avcodec_open(context, codec) < 0)
3697 * @param avctx The context which will be set up to use the given codec.
3698 * @param codec The codec to use within the context.
3699 * @return zero on success, a negative value on error
3700 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
3702 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
3704 #if FF_API_AUDIO_OLD
3706 * Decode an audio frame from buf into samples.
3707 * Wrapper function which calls avcodec_decode_audio3.
3709 * @deprecated Use avcodec_decode_audio3 instead.
3710 * @param avctx the codec context
3711 * @param[out] samples the output buffer
3712 * @param[in,out] frame_size_ptr the output buffer size in bytes
3713 * @param[in] buf the input buffer
3714 * @param[in] buf_size the input buffer size in bytes
3715 * @return On error a negative value is returned, otherwise the number of bytes
3716 * used or zero if no frame could be decompressed.
3718 attribute_deprecated int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
3719 int *frame_size_ptr,
3720 const uint8_t *buf, int buf_size);
3724 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3725 * Some decoders may support multiple frames in a single AVPacket, such
3726 * decoders would then just decode the first frame. In this case,
3727 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3728 * the remaining data in order to decode the second frame etc.
3730 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3731 * decompressed frame size in bytes.
3733 * @warning You must set frame_size_ptr to the allocated size of the
3734 * output buffer before calling avcodec_decode_audio3().
3736 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3737 * the actual read bytes because some optimized bitstream readers read 32 or 64
3738 * bits at once and could read over the end.
3740 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3741 * no overreading happens for damaged MPEG streams.
3743 * @note You might have to align the input buffer avpkt->data and output buffer
3744 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3745 * necessary at all, on others it won't work at all if not aligned and on others
3746 * it will work but it will have an impact on performance.
3748 * In practice, avpkt->data should have 4 byte alignment at minimum and
3749 * samples should be 16 byte aligned unless the CPU doesn't need it
3750 * (AltiVec and SSE do).
3752 * @param avctx the codec context
3753 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3754 * @param[in,out] frame_size_ptr the output buffer size in bytes
3755 * @param[in] avpkt The input AVPacket containing the input buffer.
3756 * You can create such packet with av_init_packet() and by then setting
3757 * data and size, some decoders might in addition need other fields.
3758 * All decoders are designed to use the least fields possible though.
3759 * @return On error a negative value is returned, otherwise the number of bytes
3760 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3762 int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3763 int *frame_size_ptr,
3766 #if FF_API_VIDEO_OLD
3768 * Decode a video frame from buf into picture.
3769 * Wrapper function which calls avcodec_decode_video2.
3771 * @deprecated Use avcodec_decode_video2 instead.
3772 * @param avctx the codec context
3773 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3774 * @param[in] buf the input buffer
3775 * @param[in] buf_size the size of the input buffer in bytes
3776 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3777 * @return On error a negative value is returned, otherwise the number of bytes
3778 * used or zero if no frame could be decompressed.
3780 attribute_deprecated int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
3781 int *got_picture_ptr,
3782 const uint8_t *buf, int buf_size);
3786 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3787 * Some decoders may support multiple frames in a single AVPacket, such
3788 * decoders would then just decode the first frame.
3790 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3791 * the actual read bytes because some optimized bitstream readers read 32 or 64
3792 * bits at once and could read over the end.
3794 * @warning The end of the input buffer buf should be set to 0 to ensure that
3795 * no overreading happens for damaged MPEG streams.
3797 * @note You might have to align the input buffer avpkt->data.
3798 * The alignment requirements depend on the CPU: on some CPUs it isn't
3799 * necessary at all, on others it won't work at all if not aligned and on others
3800 * it will work but it will have an impact on performance.
3802 * In practice, avpkt->data should have 4 byte alignment at minimum.
3804 * @note Some codecs have a delay between input and output, these need to be
3805 * fed with avpkt->data=NULL, avpkt->size=0 at the end to return the remaining frames.
3807 * @param avctx the codec context
3808 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3809 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3810 * allocate memory for the actual bitmap.
3811 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3812 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3813 * decodes and the decoder tells the user once it does not need the data anymore,
3814 * the user app can at this point free/reuse/keep the memory as it sees fit.
3816 * @param[in] avpkt The input AVpacket containing the input buffer.
3817 * You can create such packet with av_init_packet() and by then setting
3818 * data and size, some decoders might in addition need other fields like
3819 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3821 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3822 * @return On error a negative value is returned, otherwise the number of bytes
3823 * used or zero if no frame could be decompressed.
3825 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3826 int *got_picture_ptr,
3829 #if FF_API_SUBTITLE_OLD
3830 /* Decode a subtitle message. Return -1 if error, otherwise return the
3831 * number of bytes used. If no subtitle could be decompressed,
3832 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
3833 attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
3835 const uint8_t *buf, int buf_size);
3839 * Decode a subtitle message.
3840 * Return a negative value on error, otherwise return the number of bytes used.
3841 * If no subtitle could be decompressed, got_sub_ptr is zero.
3842 * Otherwise, the subtitle is stored in *sub.
3843 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3844 * simplicity, because the performance difference is expect to be negligible
3845 * and reusing a get_buffer written for video codecs would probably perform badly
3846 * due to a potentially very different allocation pattern.
3848 * @param avctx the codec context
3849 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3850 freed with avsubtitle_free if *got_sub_ptr is set.
3851 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3852 * @param[in] avpkt The input AVPacket containing the input buffer.
3854 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3859 * Frees all allocated data in the given subtitle struct.
3861 * @param sub AVSubtitle to free.
3863 void avsubtitle_free(AVSubtitle *sub);
3865 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
3867 uint8_t *buf, int buf_size);
3870 * Encode an audio frame from samples into buf.
3872 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3873 * However, for PCM audio the user will know how much space is needed
3874 * because it depends on the value passed in buf_size as described
3875 * below. In that case a lower value can be used.
3877 * @param avctx the codec context
3878 * @param[out] buf the output buffer
3879 * @param[in] buf_size the output buffer size
3880 * @param[in] samples the input buffer containing the samples
3881 * The number of samples read from this buffer is frame_size*channels,
3882 * both of which are defined in avctx.
3883 * For PCM audio the number of samples read from samples is equal to
3884 * buf_size * input_sample_size / output_sample_size.
3885 * @return On error a negative value is returned, on success zero or the number
3886 * of bytes used to encode the data read from the input buffer.
3888 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3889 const short *samples);
3892 * Encode a video frame from pict into buf.
3893 * The input picture should be
3894 * stored using a specific format, namely avctx.pix_fmt.
3896 * @param avctx the codec context
3897 * @param[out] buf the output buffer for the bitstream of encoded frame
3898 * @param[in] buf_size the size of the output buffer in bytes
3899 * @param[in] pict the input picture to encode
3900 * @return On error a negative value is returned, on success zero or the number
3901 * of bytes used from the output buffer.
3903 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3904 const AVFrame *pict);
3905 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3906 const AVSubtitle *sub);
3908 int avcodec_close(AVCodecContext *avctx);
3911 * Register all the codecs, parsers and bitstream filters which were enabled at
3912 * configuration time. If you do not call this function you can select exactly
3913 * which formats you want to support, by using the individual registration
3916 * @see avcodec_register
3917 * @see av_register_codec_parser
3918 * @see av_register_bitstream_filter
3920 void avcodec_register_all(void);
3923 * Flush buffers, should be called when seeking or when switching to a different stream.
3925 void avcodec_flush_buffers(AVCodecContext *avctx);
3927 void avcodec_default_free_buffers(AVCodecContext *s);
3929 /* misc useful functions */
3932 * Return a single letter to describe the given picture type pict_type.
3934 * @param[in] pict_type the picture type
3935 * @return A single character representing the picture type.
3937 char av_get_pict_type_char(int pict_type);
3940 * Return codec bits per sample.
3942 * @param[in] codec_id the codec
3943 * @return Number of bits per sample or zero if unknown for the given codec.
3945 int av_get_bits_per_sample(enum CodecID codec_id);
3947 #if FF_API_OLD_SAMPLE_FMT
3949 * @deprecated Use av_get_bits_per_sample_fmt() instead.
3951 attribute_deprecated
3952 int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt);
3956 typedef struct AVCodecParserContext {
3958 struct AVCodecParser *parser;
3959 int64_t frame_offset; /* offset of the current frame */
3960 int64_t cur_offset; /* current offset
3961 (incremented by each av_parser_parse()) */
3962 int64_t next_frame_offset; /* offset of the next frame */
3964 int pict_type; /* XXX: Put it back in AVCodecContext. */
3966 * This field is used for proper frame duration computation in lavf.
3967 * It signals, how much longer the frame duration of the current frame
3968 * is compared to normal frame duration.
3970 * frame_duration = (1 + repeat_pict) * time_base
3972 * It is used by codecs like H.264 to display telecined material.
3974 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3975 int64_t pts; /* pts of the current frame */
3976 int64_t dts; /* dts of the current frame */
3981 int fetch_timestamp;
3983 #define AV_PARSER_PTS_NB 4
3984 int cur_frame_start_index;
3985 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3986 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3987 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3990 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3991 #define PARSER_FLAG_ONCE 0x0002
3992 /// Set if the parser has a valid file offset
3993 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3995 int64_t offset; ///< byte offset from starting packet start
3996 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3999 * Set by parser to 1 for key frames and 0 for non-key frames.
4000 * It is initialized to -1, so if the parser doesn't set this flag,
4001 * old-style fallback using FF_I_TYPE picture type as key frames
4007 * Time difference in stream time base units from the pts of this
4008 * packet to the point at which the output from the decoder has converged
4009 * independent from the availability of previous frames. That is, the
4010 * frames are virtually identical no matter if decoding started from
4011 * the very first frame or from this keyframe.
4012 * Is AV_NOPTS_VALUE if unknown.
4013 * This field is not the display duration of the current frame.
4014 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
4017 * The purpose of this field is to allow seeking in streams that have no
4018 * keyframes in the conventional sense. It corresponds to the
4019 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
4020 * essential for some types of subtitle streams to ensure that all
4021 * subtitles are correctly displayed after seeking.
4023 int64_t convergence_duration;
4025 // Timestamp generation support:
4027 * Synchronization point for start of timestamp generation.
4029 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4032 * For example, this corresponds to presence of H.264 buffering period
4038 * Offset of the current timestamp against last timestamp sync point in
4039 * units of AVCodecContext.time_base.
4041 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4042 * contain a valid timestamp offset.
4044 * Note that the timestamp of sync point has usually a nonzero
4045 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4046 * the next frame after timestamp sync point will be usually 1.
4048 * For example, this corresponds to H.264 cpb_removal_delay.
4050 int dts_ref_dts_delta;
4053 * Presentation delay of current frame in units of AVCodecContext.time_base.
4055 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4056 * contain valid non-negative timestamp delta (presentation time of a frame
4057 * must not lie in the past).
4059 * This delay represents the difference between decoding and presentation
4060 * time of the frame.
4062 * For example, this corresponds to H.264 dpb_output_delay.
4067 * Position of the packet in file.
4069 * Analogous to cur_frame_pts/dts
4071 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4074 * Byte position of currently parsed frame in stream.
4079 * Previous frame byte position.
4082 } AVCodecParserContext;
4084 typedef struct AVCodecParser {
4085 int codec_ids[5]; /* several codec IDs are permitted */
4087 int (*parser_init)(AVCodecParserContext *s);
4088 int (*parser_parse)(AVCodecParserContext *s,
4089 AVCodecContext *avctx,
4090 const uint8_t **poutbuf, int *poutbuf_size,
4091 const uint8_t *buf, int buf_size);
4092 void (*parser_close)(AVCodecParserContext *s);
4093 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4094 struct AVCodecParser *next;
4097 AVCodecParser *av_parser_next(AVCodecParser *c);
4099 void av_register_codec_parser(AVCodecParser *parser);
4100 AVCodecParserContext *av_parser_init(int codec_id);
4102 #if LIBAVCODEC_VERSION_MAJOR < 53
4103 attribute_deprecated
4104 int av_parser_parse(AVCodecParserContext *s,
4105 AVCodecContext *avctx,
4106 uint8_t **poutbuf, int *poutbuf_size,
4107 const uint8_t *buf, int buf_size,
4108 int64_t pts, int64_t dts);
4114 * @param s parser context.
4115 * @param avctx codec context.
4116 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4117 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4118 * @param buf input buffer.
4119 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4120 * @param pts input presentation timestamp.
4121 * @param dts input decoding timestamp.
4122 * @param pos input byte position in stream.
4123 * @return the number of bytes of the input bitstream used.
4128 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4135 * decode_frame(data, size);
4139 int av_parser_parse2(AVCodecParserContext *s,
4140 AVCodecContext *avctx,
4141 uint8_t **poutbuf, int *poutbuf_size,
4142 const uint8_t *buf, int buf_size,
4143 int64_t pts, int64_t dts,
4146 int av_parser_change(AVCodecParserContext *s,
4147 AVCodecContext *avctx,
4148 uint8_t **poutbuf, int *poutbuf_size,
4149 const uint8_t *buf, int buf_size, int keyframe);
4150 void av_parser_close(AVCodecParserContext *s);
4153 typedef struct AVBitStreamFilterContext {
4155 struct AVBitStreamFilter *filter;
4156 AVCodecParserContext *parser;
4157 struct AVBitStreamFilterContext *next;
4158 } AVBitStreamFilterContext;
4161 typedef struct AVBitStreamFilter {
4164 int (*filter)(AVBitStreamFilterContext *bsfc,
4165 AVCodecContext *avctx, const char *args,
4166 uint8_t **poutbuf, int *poutbuf_size,
4167 const uint8_t *buf, int buf_size, int keyframe);
4168 void (*close)(AVBitStreamFilterContext *bsfc);
4169 struct AVBitStreamFilter *next;
4170 } AVBitStreamFilter;
4172 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4173 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4174 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4175 AVCodecContext *avctx, const char *args,
4176 uint8_t **poutbuf, int *poutbuf_size,
4177 const uint8_t *buf, int buf_size, int keyframe);
4178 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4180 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4185 * Reallocate the given block if it is not large enough, otherwise do nothing.
4189 void *av_fast_realloc(void *ptr, unsigned int *size, FF_INTERNALC_MEM_TYPE min_size);
4192 * Allocate a buffer, reusing the given one if large enough.
4194 * Contrary to av_fast_realloc the current buffer contents might not be
4195 * preserved and on error the old buffer is freed, thus no special
4196 * handling to avoid memleaks is necessary.
4198 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4199 * @param size size of the buffer *ptr points to
4200 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4201 * *size 0 if an error occurred.
4203 void av_fast_malloc(void *ptr, unsigned int *size, FF_INTERNALC_MEM_TYPE min_size);
4205 #if LIBAVCODEC_VERSION_MAJOR < 53
4207 * @deprecated Deprecated in favor of av_image_copy().
4209 attribute_deprecated
4210 void av_picture_data_copy(uint8_t *dst_data[4], int dst_linesize[4],
4211 uint8_t *src_data[4], int src_linesize[4],
4212 enum PixelFormat pix_fmt, int width, int height);
4216 * Copy image src to dst. Wraps av_picture_data_copy() above.
4218 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4219 enum PixelFormat pix_fmt, int width, int height);
4222 * Crop image top and left side.
4224 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4225 enum PixelFormat pix_fmt, int top_band, int left_band);
4230 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4231 int padtop, int padbottom, int padleft, int padright, int *color);
4234 * Encode extradata length to a buffer. Used by xiph codecs.
4236 * @param s buffer to write to; must be at least (v/255+1) bytes long
4237 * @param v size of extradata in bytes
4238 * @return number of bytes written to the buffer.
4240 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4242 #if LIBAVCODEC_VERSION_MAJOR < 53
4244 * Parse str and put in width_ptr and height_ptr the detected values.
4246 * @deprecated Deprecated in favor of av_parse_video_size().
4248 attribute_deprecated int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
4251 * Parse str and store the detected values in *frame_rate.
4253 * @deprecated Deprecated in favor of av_parse_video_rate().
4255 attribute_deprecated int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
4259 * Logs a generic warning message about a missing feature. This function is
4260 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4261 * only, and would normally not be used by applications.
4262 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4263 * a pointer to an AVClass struct
4264 * @param[in] feature string containing the name of the missing feature
4265 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4266 * If want_sample is non-zero, additional verbage will be added to the log
4267 * message which tells the user how to report samples to the development
4270 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4273 * Log a generic warning message asking for a sample. This function is
4274 * intended to be used internally by FFmpeg (libavcodec, libavformat, etc.)
4275 * only, and would normally not be used by applications.
4276 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4277 * a pointer to an AVClass struct
4278 * @param[in] msg string containing an optional message, or NULL if no message
4280 void av_log_ask_for_sample(void *avc, const char *msg);
4283 * Register the hardware accelerator hwaccel.
4285 void av_register_hwaccel(AVHWAccel *hwaccel);
4288 * If hwaccel is NULL, returns the first registered hardware accelerator,
4289 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4290 * after hwaccel, or NULL if hwaccel is the last one.
4292 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4296 * Lock operation used by lockmgr
4299 AV_LOCK_CREATE, ///< Create a mutex
4300 AV_LOCK_OBTAIN, ///< Lock the mutex
4301 AV_LOCK_RELEASE, ///< Unlock the mutex
4302 AV_LOCK_DESTROY, ///< Free mutex resources
4306 * Register a user provided lock manager supporting the operations
4307 * specified by AVLockOp. mutex points to a (void *) where the
4308 * lockmgr should store/get a pointer to a user allocated mutex. It's
4309 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4311 * @param cb User defined callback. Note: FFmpeg may invoke calls to this
4312 * callback during the call to av_lockmgr_register().
4313 * Thus, the application must be prepared to handle that.
4314 * If cb is set to NULL the lockmgr will be unregistered.
4315 * Also note that during unregistration the previously registered
4316 * lockmgr callback may also be invoked.
4318 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4320 #endif /* AVCODEC_AVCODEC_H */