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 FFMPEG_AVCODEC_H
22 #define FFMPEG_AVCODEC_H
30 #include "libavutil/avutil.h"
32 #define LIBAVCODEC_VERSION_MAJOR 51
33 #define LIBAVCODEC_VERSION_MINOR 57
34 #define LIBAVCODEC_VERSION_MICRO 2
36 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
37 LIBAVCODEC_VERSION_MINOR, \
38 LIBAVCODEC_VERSION_MICRO)
39 #define LIBAVCODEC_VERSION AV_VERSION(LIBAVCODEC_VERSION_MAJOR, \
40 LIBAVCODEC_VERSION_MINOR, \
41 LIBAVCODEC_VERSION_MICRO)
42 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
44 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
46 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
47 #define AV_TIME_BASE 1000000
48 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
51 * Identifies the syntax and semantics of the bitstream.
52 * The principle is roughly:
53 * Two decoders with the same ID can decode the same streams.
54 * Two encoders with the same ID can encode compatible streams.
55 * There may be slight deviations from the principle due to implementation
58 * If you add a codec ID to this list, add it so that
59 * 1. no value of a existing codec ID changes (that would break ABI),
60 * 2. it is as close as possible to similar codecs.
67 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
68 CODEC_ID_MPEG2VIDEO_XVMC,
105 CODEC_ID_INTERPLAY_VIDEO,
117 CODEC_ID_TRUEMOTION1,
145 CODEC_ID_TRUEMOTION2,
162 CODEC_ID_DSICINVIDEO,
163 CODEC_ID_TIERTEXSEQVIDEO,
172 CODEC_ID_BETHSOFTVID,
190 /* various PCM "codecs" */
191 CODEC_ID_PCM_S16LE= 0x10000,
207 CODEC_ID_PCM_S24DAUD,
209 CODEC_ID_PCM_S16LE_PLANAR,
212 /* various ADPCM codecs */
213 CODEC_ID_ADPCM_IMA_QT= 0x11000,
214 CODEC_ID_ADPCM_IMA_WAV,
215 CODEC_ID_ADPCM_IMA_DK3,
216 CODEC_ID_ADPCM_IMA_DK4,
217 CODEC_ID_ADPCM_IMA_WS,
218 CODEC_ID_ADPCM_IMA_SMJPEG,
227 CODEC_ID_ADPCM_YAMAHA,
228 CODEC_ID_ADPCM_SBPRO_4,
229 CODEC_ID_ADPCM_SBPRO_3,
230 CODEC_ID_ADPCM_SBPRO_2,
232 CODEC_ID_ADPCM_IMA_AMV,
233 CODEC_ID_ADPCM_EA_R1,
234 CODEC_ID_ADPCM_EA_R3,
235 CODEC_ID_ADPCM_EA_R2,
236 CODEC_ID_ADPCM_IMA_EA_SEAD,
237 CODEC_ID_ADPCM_IMA_EA_EACS,
238 CODEC_ID_ADPCM_EA_XAS,
239 CODEC_ID_ADPCM_EA_MAXIS_XA,
242 CODEC_ID_AMR_NB= 0x12000,
245 /* RealAudio codecs*/
246 CODEC_ID_RA_144= 0x13000,
249 /* various DPCM codecs */
250 CODEC_ID_ROQ_DPCM= 0x14000,
251 CODEC_ID_INTERPLAY_DPCM,
256 CODEC_ID_MP2= 0x15000,
257 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
259 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
278 CODEC_ID_WESTWOOD_SND1,
279 CODEC_ID_GSM, ///< as in Berlin toast format
287 CODEC_ID_DSICINAUDIO,
291 CODEC_ID_GSM_MS, /* as found in WAV */
300 CODEC_ID_WMALOSSLESS,
303 /* subtitle codecs */
304 CODEC_ID_DVD_SUBTITLE= 0x17000,
305 CODEC_ID_DVB_SUBTITLE,
306 CODEC_ID_TEXT, ///< raw UTF-8 text
311 /* other specific kind of codecs (generally used for attachments) */
312 CODEC_ID_TTF= 0x18000,
314 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
315 * stream (only used by libavformat) */
318 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
319 /* CODEC_ID_MP3LAME is obsolete */
320 #define CODEC_ID_MP3LAME CODEC_ID_MP3
321 #define CODEC_ID_MPEG4AAC CODEC_ID_AAC
325 CODEC_TYPE_UNKNOWN = -1,
330 CODEC_TYPE_ATTACHMENT,
335 * Currently unused, may be used if 24/32 bits samples are ever supported.
336 * all in native-endian format
339 SAMPLE_FMT_NONE = -1,
340 SAMPLE_FMT_U8, ///< unsigned 8 bits
341 SAMPLE_FMT_S16, ///< signed 16 bits
342 SAMPLE_FMT_S24, ///< signed 24 bits
343 SAMPLE_FMT_S32, ///< signed 32 bits
344 SAMPLE_FMT_FLT, ///< float
348 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
351 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
352 * This is mainly needed because some optimized bitstream readers read
353 * 32 or 64 bit at once and could read over the end.<br>
354 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
355 * MPEG bitstreams could cause overread and segfault.
357 #define FF_INPUT_BUFFER_PADDING_SIZE 8
360 * minimum encoding buffer size
361 * Used to avoid some checks during header writing.
363 #define FF_MIN_BUFFER_SIZE 16384
366 * motion estimation type.
369 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
373 ME_EPZS, ///< enhanced predictive zonal search
374 ME_X1, ///< reserved for experiments
375 ME_HEX, ///< hexagon based search
376 ME_UMH, ///< uneven multi-hexagon search
377 ME_ITER, ///< iterative search
378 ME_TESA, ///< transformed exhaustive search algorithm
382 /* We leave some space between them for extensions (drop some
383 * keyframes for intra-only or drop just some bidir frames). */
384 AVDISCARD_NONE =-16, ///< discard nothing
385 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
386 AVDISCARD_NONREF = 8, ///< discard all non reference
387 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
388 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
389 AVDISCARD_ALL = 48, ///< discard all
392 typedef struct RcOverride{
395 int qscale; // If this is 0 then quality_factor will be used instead.
396 float quality_factor;
399 #define FF_MAX_B_FRAMES 16
402 These flags can be passed in AVCodecContext.flags before initialization.
403 Note: Not everything is supported yet.
406 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
407 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
408 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
409 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
410 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
411 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
413 * The parent program guarantees that the input for B-frames containing
414 * streams is not written to for at least s->max_b_frames+1 frames, if
415 * this is not set the input will be copied.
417 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
418 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
419 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
420 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
421 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
422 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
423 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
424 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
425 location instead of only at frame boundaries. */
426 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
427 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
428 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
429 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
430 #define CODEC_FLAG_TRELLIS_QUANT 0x00200000 ///< Use trellis quantization.
431 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
432 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
433 /* Fx : Flag for h263+ extra options */
434 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
435 #define CODEC_FLAG_H263P_AIC 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction (remove this)
437 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
438 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
439 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
440 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
441 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
442 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
443 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
444 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
445 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
446 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
447 #define CODEC_FLAG_CLOSED_GOP 0x80000000
448 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
449 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
450 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
451 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
452 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
453 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
454 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
455 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
456 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
457 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
458 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
459 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
460 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
461 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
462 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
463 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
464 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
465 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
467 /* Unsupported options :
468 * Syntax Arithmetic coding (SAC)
469 * Reference Picture Selection
470 * Independent Segment Decoding */
472 /* codec capabilities */
474 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
476 * Codec uses get_buffer() for allocating buffers.
477 * direct rendering method 1
479 #define CODEC_CAP_DR1 0x0002
480 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
481 #define CODEC_CAP_PARSE_ONLY 0x0004
482 #define CODEC_CAP_TRUNCATED 0x0008
483 /* Codec can export data for HW decoding (XvMC). */
484 #define CODEC_CAP_HWACCEL 0x0010
486 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
487 * If this is not set, the codec is guaranteed to never be fed with NULL data.
489 #define CODEC_CAP_DELAY 0x0020
491 * Codec can be fed a final frame with a smaller size.
492 * This can be used to prevent truncation of the last audio samples.
494 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
496 //The following defines may change, don't expect compatibility if you use them.
497 #define MB_TYPE_INTRA4x4 0x0001
498 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
499 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
500 #define MB_TYPE_16x16 0x0008
501 #define MB_TYPE_16x8 0x0010
502 #define MB_TYPE_8x16 0x0020
503 #define MB_TYPE_8x8 0x0040
504 #define MB_TYPE_INTERLACED 0x0080
505 #define MB_TYPE_DIRECT2 0x0100 //FIXME
506 #define MB_TYPE_ACPRED 0x0200
507 #define MB_TYPE_GMC 0x0400
508 #define MB_TYPE_SKIP 0x0800
509 #define MB_TYPE_P0L0 0x1000
510 #define MB_TYPE_P1L0 0x2000
511 #define MB_TYPE_P0L1 0x4000
512 #define MB_TYPE_P1L1 0x8000
513 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
514 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
515 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
516 #define MB_TYPE_QUANT 0x00010000
517 #define MB_TYPE_CBP 0x00020000
518 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
522 * This specifies the area which should be displayed.
523 * Note there may be multiple such areas for one frame.
525 typedef struct AVPanScan{
528 * - encoding: Set by user.
529 * - decoding: Set by libavcodec.
534 * width and height in 1/16 pel
535 * - encoding: Set by user.
536 * - decoding: Set by libavcodec.
542 * position of the top left corner in 1/16 pel for up to 3 fields/frames
543 * - encoding: Set by user.
544 * - decoding: Set by libavcodec.
546 int16_t position[3][2];
549 #define FF_COMMON_FRAME \
551 * pointer to the picture planes.\
552 * This might be different from the first allocated byte\
559 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
560 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
566 * 1 -> keyframe, 0-> not\
567 * - encoding: Set by libavcodec.\
568 * - decoding: Set by libavcodec.\
573 * Picture type of the frame, see ?_TYPE below.\
574 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
575 * - decoding: Set by libavcodec.\
580 * presentation timestamp in time_base units (time when frame should be shown to user)\
581 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
582 * - encoding: MUST be set by user.\
583 * - decoding: Set by libavcodec.\
588 * picture number in bitstream order\
589 * - encoding: set by\
590 * - decoding: Set by libavcodec.\
592 int coded_picture_number;\
594 * picture number in display order\
595 * - encoding: set by\
596 * - decoding: Set by libavcodec.\
598 int display_picture_number;\
601 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
602 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
603 * - decoding: Set by libavcodec.\
608 * buffer age (1->was last buffer and dint change, 2->..., ...).\
609 * Set to INT_MAX if the buffer has not been used yet.\
610 * - encoding: unused\
611 * - decoding: MUST be set by get_buffer().\
616 * is this picture used as reference\
617 * The values for this are the same as the MpegEncContext.picture_structure\
618 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.\
619 * - encoding: unused\
620 * - decoding: Set by libavcodec. (before get_buffer() call)).\
626 * - encoding: unused\
627 * - decoding: Set by libavcodec.\
629 int8_t *qscale_table;\
632 * - encoding: unused\
633 * - decoding: Set by libavcodec.\
638 * mbskip_table[mb]>=1 if MB didn't change\
639 * stride= mb_width = (width+15)>>4\
640 * - encoding: unused\
641 * - decoding: Set by libavcodec.\
643 uint8_t *mbskip_table;\
646 * motion vector table\
649 * int mv_sample_log2= 4 - motion_subsample_log2;\
650 * int mb_width= (width+15)>>4;\
651 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
652 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
654 * - encoding: Set by user.\
655 * - decoding: Set by libavcodec.\
657 int16_t (*motion_val[2])[2];\
660 * macroblock type table\
661 * mb_type_base + mb_width + 2\
662 * - encoding: Set by user.\
663 * - decoding: Set by libavcodec.\
668 * log2 of the size of the block which a single vector in motion_val represents: \
669 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
670 * - encoding: unused\
671 * - decoding: Set by libavcodec.\
673 uint8_t motion_subsample_log2;\
676 * for some private data of the user\
677 * - encoding: unused\
678 * - decoding: Set by user.\
684 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
685 * - decoding: unused\
690 * type of the buffer (to keep track of who has to deallocate data[*])\
691 * - encoding: Set by the one who allocates it.\
692 * - decoding: Set by the one who allocates it.\
693 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
698 * When decoding, this signals how much the picture must be delayed.\
699 * extra_delay = repeat_pict / (2*fps)\
700 * - encoding: unused\
701 * - decoding: Set by libavcodec.\
711 * The content of the picture is interlaced.\
712 * - encoding: Set by user.\
713 * - decoding: Set by libavcodec. (default 0)\
715 int interlaced_frame;\
718 * If the content is interlaced, is top field displayed first.\
719 * - encoding: Set by user.\
720 * - decoding: Set by libavcodec.\
722 int top_field_first;\
726 * - encoding: Set by user.\
727 * - decoding: Set by libavcodec.\
729 AVPanScan *pan_scan;\
732 * Tell user application that palette has changed from previous frame.\
733 * - encoding: ??? (no palette-enabled encoder yet)\
734 * - decoding: Set by libavcodec. (default 0).\
736 int palette_has_changed;\
739 * codec suggestion on buffer type if != 0\
740 * - encoding: unused\
741 * - decoding: Set by libavcodec. (before get_buffer() call)).\
747 * - encoding: unused\
748 * - decoding: Set by libavcodec.\
753 * motion referece frame index\
754 * - encoding: Set by user.\
755 * - decoding: Set by libavcodec.\
757 int8_t *ref_index[2];
759 #define FF_QSCALE_TYPE_MPEG1 0
760 #define FF_QSCALE_TYPE_MPEG2 1
761 #define FF_QSCALE_TYPE_H264 2
763 #define FF_BUFFER_TYPE_INTERNAL 1
764 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
765 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
766 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
769 #define FF_I_TYPE 1 ///< Intra
770 #define FF_P_TYPE 2 ///< Predicted
771 #define FF_B_TYPE 3 ///< Bi-dir predicted
772 #define FF_S_TYPE 4 ///< S(GMC)-VOP MPEG4
773 #define FF_SI_TYPE 5 ///< Switching Intra
774 #define FF_SP_TYPE 6 ///< Switching Predicted
777 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
778 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
779 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
780 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
784 * New fields can be added to the end of FF_COMMON_FRAME with minor version
786 * Removal, reordering and changes to existing fields require a major
787 * version bump. No fields should be added into AVFrame before or after
789 * sizeof(AVFrame) must not be used outside libav*.
791 typedef struct AVFrame {
795 #define DEFAULT_FRAME_RATE_BASE 1001000
798 * main external API structure.
799 * New fields can be added to the end with minor version bumps.
800 * Removal, reordering and changes to existing fields require a major
802 * sizeof(AVCodecContext) must not be used outside libav*.
804 typedef struct AVCodecContext {
806 * information on struct for av_log
807 * - set by avcodec_alloc_context
809 const AVClass *av_class;
811 * the average bitrate
812 * - encoding: Set by user; unused for constant quantizer encoding.
813 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
818 * number of bits the bitstream is allowed to diverge from the reference.
819 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
820 * - encoding: Set by user; unused for constant quantizer encoding.
823 int bit_rate_tolerance;
827 * - encoding: Set by user.
828 * - decoding: Set by user.
833 * Some codecs need additional format info. It is stored here.
834 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
835 * specific codec MUST set it correctly otherwise stream copy breaks.
836 * In general use of this field by muxers is not recommanded.
837 * - encoding: Set by libavcodec.
838 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
843 * Motion estimation algorithm used for video coding.
844 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
845 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
846 * - encoding: MUST be set by user.
852 * some codecs need / can use extradata like Huffman tables.
853 * mjpeg: Huffman tables
854 * rv10: additional flags
855 * mpeg4: global headers (they can be in the bitstream or here)
856 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
857 * than extradata_size to avoid prolems if it is read with the bitstream reader.
858 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
859 * - encoding: Set/allocated/freed by libavcodec.
860 * - decoding: Set/allocated/freed by user.
866 * This is the fundamental unit of time (in seconds) in terms
867 * of which frame timestamps are represented. For fixed-fps content,
868 * timebase should be 1/framerate and timestamp increments should be
870 * - encoding: MUST be set by user.
871 * - decoding: Set by libavcodec.
873 AVRational time_base;
877 * picture width / height.
878 * - encoding: MUST be set by user.
879 * - decoding: Set by libavcodec.
880 * Note: For compatibility it is possible to set this instead of
881 * coded_width/height before decoding.
885 #define FF_ASPECT_EXTENDED 15
888 * the number of pictures in a group of pictures, or 0 for intra_only
889 * - encoding: Set by user.
895 * Pixel format, see PIX_FMT_xxx.
896 * - encoding: Set by user.
897 * - decoding: Set by libavcodec.
899 enum PixelFormat pix_fmt;
902 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
903 * has to read frames at native frame rate.
904 * - encoding: Set by user.
910 * If non NULL, 'draw_horiz_band' is called by the libavcodec
911 * decoder to draw a horizontal band. It improves cache usage. Not
912 * all codecs can do that. You must check the codec capabilities
915 * - decoding: Set by user.
916 * @param height the height of the slice
917 * @param y the y position of the slice
918 * @param type 1->top field, 2->bottom field, 3->frame
919 * @param offset offset into the AVFrame.data from which the slice should be read
921 void (*draw_horiz_band)(struct AVCodecContext *s,
922 const AVFrame *src, int offset[4],
923 int y, int type, int height);
926 int sample_rate; ///< samples per second
927 int channels; ///< number of audio channels
930 * audio sample format
931 * - encoding: Set by user.
932 * - decoding: Set by libavcodec.
934 enum SampleFormat sample_fmt; ///< sample format, currently unused
936 /* The following data should not be initialized. */
938 * Samples per packet, initialized when calling 'init'.
941 int frame_number; ///< audio or video frame number
942 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
945 * Number of frames the decoded output will be delayed relative to
947 * - encoding: Set by libavcodec.
952 /* - encoding parameters */
953 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
954 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
958 * - encoding: Set by user.
965 * - encoding: Set by user.
971 * maximum quantizer difference between frames
972 * - encoding: Set by user.
978 * maximum number of B-frames between non-B-frames
979 * Note: The output will be delayed by max_b_frames+1 relative to the input.
980 * - encoding: Set by user.
986 * qscale factor between IP and B-frames
987 * - encoding: Set by user.
990 float b_quant_factor;
992 /** obsolete FIXME remove */
994 #define FF_RC_STRATEGY_XVID 1
996 int b_frame_strategy;
1000 * - encoding: unused
1001 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
1002 * @deprecated Deprecated in favor of skip_idct and skip_frame.
1006 struct AVCodec *codec;
1010 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
1011 /* unused, FIXME remove*/
1015 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1016 /* do its best to deliver a chunk with size */
1017 /* below rtp_payload_size, the chunk will start */
1018 /* with a start code on some codecs like H.263. */
1019 /* This doesn't take account of any particular */
1020 /* headers inside the transmitted RTP payload. */
1023 /* The RTP callback: This function is called */
1024 /* every time the encoder has a packet to send. */
1025 /* It depends on the encoder if the data starts */
1026 /* with a Start Code (it should). H.263 does. */
1027 /* mb_nb contains the number of macroblocks */
1028 /* encoded in the RTP payload. */
1029 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1031 /* statistics, used for 2-pass encoding */
1042 * number of bits used for the previously encoded frame
1043 * - encoding: Set by libavcodec.
1044 * - decoding: unused
1049 * Private data of the user, can be used to carry app specific stuff.
1050 * - encoding: Set by user.
1051 * - decoding: Set by user.
1055 char codec_name[32];
1056 enum CodecType codec_type; /* see CODEC_TYPE_xxx */
1057 enum CodecID codec_id; /* see CODEC_ID_xxx */
1060 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1061 * This is used to work around some encoder bugs.
1062 * A demuxer should set this to what is stored in the field used to identify the codec.
1063 * If there are multiple such fields in a container then the demuxer should choose the one
1064 * which maximizes the information about the used codec.
1065 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1066 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1067 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1069 * - encoding: Set by user, if not then the default based on codec_id will be used.
1070 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1072 unsigned int codec_tag;
1075 * Work around bugs in encoders which sometimes cannot be detected automatically.
1076 * - encoding: Set by user
1077 * - decoding: Set by user
1079 int workaround_bugs;
1080 #define FF_BUG_AUTODETECT 1 ///< autodetection
1081 #define FF_BUG_OLD_MSMPEG4 2
1082 #define FF_BUG_XVID_ILACE 4
1083 #define FF_BUG_UMP4 8
1084 #define FF_BUG_NO_PADDING 16
1085 #define FF_BUG_AMV 32
1086 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1087 #define FF_BUG_QPEL_CHROMA 64
1088 #define FF_BUG_STD_QPEL 128
1089 #define FF_BUG_QPEL_CHROMA2 256
1090 #define FF_BUG_DIRECT_BLOCKSIZE 512
1091 #define FF_BUG_EDGE 1024
1092 #define FF_BUG_HPEL_CHROMA 2048
1093 #define FF_BUG_DC_CLIP 4096
1094 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1095 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1098 * luma single coefficient elimination threshold
1099 * - encoding: Set by user.
1100 * - decoding: unused
1102 int luma_elim_threshold;
1105 * chroma single coeff elimination threshold
1106 * - encoding: Set by user.
1107 * - decoding: unused
1109 int chroma_elim_threshold;
1112 * strictly follow the standard (MPEG4, ...).
1113 * - encoding: Set by user.
1114 * - decoding: unused
1116 int strict_std_compliance;
1117 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1118 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1119 #define FF_COMPLIANCE_NORMAL 0
1120 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1121 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1124 * qscale offset between IP and B-frames
1125 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1126 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1127 * - encoding: Set by user.
1128 * - decoding: unused
1130 float b_quant_offset;
1133 * Error resilience; higher values will detect more errors but may
1134 * misdetect some more or less valid parts as errors.
1135 * - encoding: unused
1136 * - decoding: Set by user.
1138 int error_resilience;
1139 #define FF_ER_CAREFUL 1
1140 #define FF_ER_COMPLIANT 2
1141 #define FF_ER_AGGRESSIVE 3
1142 #define FF_ER_VERY_AGGRESSIVE 4
1145 * Called at the beginning of each frame to get a buffer for it.
1146 * If pic.reference is set then the frame will be read later by libavcodec.
1147 * avcodec_align_dimensions() should be used to find the required width and
1148 * height, as they normally need to be rounded up to the next multiple of 16.
1149 * - encoding: unused
1150 * - decoding: Set by libavcodec., user can override.
1152 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1155 * Called to release buffers which were allocated with get_buffer.
1156 * A released buffer can be reused in get_buffer().
1157 * pic.data[*] must be set to NULL.
1158 * - encoding: unused
1159 * - decoding: Set by libavcodec., user can override.
1161 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1164 * If 1 the stream has a 1 frame delay during decoding.
1165 * - encoding: Set by libavcodec.
1166 * - decoding: Set by libavcodec.
1171 * number of bytes per packet if constant and known or 0
1172 * Used by some WAV based audio codecs.
1176 int parse_only; /* - decoding only: If true, only parsing is done
1177 (function avcodec_parse_frame()). The frame
1178 data is returned. Only MPEG codecs support this now. */
1181 * 0-> h263 quant 1-> mpeg quant
1182 * - encoding: Set by user.
1183 * - decoding: unused
1188 * pass1 encoding statistics output buffer
1189 * - encoding: Set by libavcodec.
1190 * - decoding: unused
1195 * pass2 encoding statistics input buffer
1196 * Concatenated stuff from stats_out of pass1 should be placed here.
1197 * - encoding: Allocated/set/freed by user.
1198 * - decoding: unused
1203 * ratecontrol qmin qmax limiting method
1204 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1205 * - encoding: Set by user.
1206 * - decoding: unused
1214 * ratecontrol override, see RcOverride
1215 * - encoding: Allocated/set/freed by user.
1216 * - decoding: unused
1218 RcOverride *rc_override;
1219 int rc_override_count;
1222 * rate control equation
1223 * - encoding: Set by user
1224 * - decoding: unused
1230 * - encoding: Set by user.
1231 * - decoding: unused
1237 * - encoding: Set by user.
1238 * - decoding: unused
1243 * decoder bitstream buffer size
1244 * - encoding: Set by user.
1245 * - decoding: unused
1248 float rc_buffer_aggressivity;
1251 * qscale factor between P and I-frames
1252 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1253 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1254 * - encoding: Set by user.
1255 * - decoding: unused
1257 float i_quant_factor;
1260 * qscale offset between P and I-frames
1261 * - encoding: Set by user.
1262 * - decoding: unused
1264 float i_quant_offset;
1267 * initial complexity for pass1 ratecontrol
1268 * - encoding: Set by user.
1269 * - decoding: unused
1271 float rc_initial_cplx;
1274 * DCT algorithm, see FF_DCT_* below
1275 * - encoding: Set by user.
1276 * - decoding: unused
1279 #define FF_DCT_AUTO 0
1280 #define FF_DCT_FASTINT 1
1281 #define FF_DCT_INT 2
1282 #define FF_DCT_MMX 3
1283 #define FF_DCT_MLIB 4
1284 #define FF_DCT_ALTIVEC 5
1285 #define FF_DCT_FAAN 6
1288 * luminance masking (0-> disabled)
1289 * - encoding: Set by user.
1290 * - decoding: unused
1295 * temporary complexity masking (0-> disabled)
1296 * - encoding: Set by user.
1297 * - decoding: unused
1299 float temporal_cplx_masking;
1302 * spatial complexity masking (0-> disabled)
1303 * - encoding: Set by user.
1304 * - decoding: unused
1306 float spatial_cplx_masking;
1309 * p block masking (0-> disabled)
1310 * - encoding: Set by user.
1311 * - decoding: unused
1316 * darkness masking (0-> disabled)
1317 * - encoding: Set by user.
1318 * - decoding: unused
1323 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
1324 /* for binary compatibility */
1329 * IDCT algorithm, see FF_IDCT_* below.
1330 * - encoding: Set by user.
1331 * - decoding: Set by user.
1334 #define FF_IDCT_AUTO 0
1335 #define FF_IDCT_INT 1
1336 #define FF_IDCT_SIMPLE 2
1337 #define FF_IDCT_SIMPLEMMX 3
1338 #define FF_IDCT_LIBMPEG2MMX 4
1339 #define FF_IDCT_PS2 5
1340 #define FF_IDCT_MLIB 6
1341 #define FF_IDCT_ARM 7
1342 #define FF_IDCT_ALTIVEC 8
1343 #define FF_IDCT_SH4 9
1344 #define FF_IDCT_SIMPLEARM 10
1345 #define FF_IDCT_H264 11
1346 #define FF_IDCT_VP3 12
1347 #define FF_IDCT_IPP 13
1348 #define FF_IDCT_XVIDMMX 14
1349 #define FF_IDCT_CAVS 15
1350 #define FF_IDCT_SIMPLEARMV5TE 16
1351 #define FF_IDCT_SIMPLEARMV6 17
1352 #define FF_IDCT_SIMPLEVIS 18
1353 #define FF_IDCT_WMV2 19
1354 #define FF_IDCT_FAAN 20
1358 * - encoding: Set by libavcodec.
1359 * - decoding: Set by user (or 0).
1363 * slice offsets in the frame in bytes
1364 * - encoding: Set/allocated by libavcodec.
1365 * - decoding: Set/allocated by user (or NULL).
1370 * error concealment flags
1371 * - encoding: unused
1372 * - decoding: Set by user.
1374 int error_concealment;
1375 #define FF_EC_GUESS_MVS 1
1376 #define FF_EC_DEBLOCK 2
1379 * dsp_mask could be add used to disable unwanted CPU features
1380 * CPU features (i.e. MMX, SSE. ...)
1382 * With the FORCE flag you may instead enable given CPU features.
1383 * (Dangerous: Usable in case of misdetection, improper usage however will
1384 * result into program crash.)
1387 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1388 /* lower 16 bits - CPU features */
1389 #define FF_MM_MMX 0x0001 ///< standard MMX
1390 #define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
1391 #define FF_MM_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
1392 #define FF_MM_SSE 0x0008 ///< SSE functions
1393 #define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
1394 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1395 #define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
1396 #define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
1397 #define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
1400 * bits per sample/pixel from the demuxer (needed for huffyuv).
1401 * - encoding: Set by libavcodec.
1402 * - decoding: Set by user.
1404 int bits_per_sample;
1407 * prediction method (needed for huffyuv)
1408 * - encoding: Set by user.
1409 * - decoding: unused
1411 int prediction_method;
1412 #define FF_PRED_LEFT 0
1413 #define FF_PRED_PLANE 1
1414 #define FF_PRED_MEDIAN 2
1417 * sample aspect ratio (0 if unknown)
1418 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1419 * - encoding: Set by user.
1420 * - decoding: Set by libavcodec.
1422 AVRational sample_aspect_ratio;
1425 * the picture in the bitstream
1426 * - encoding: Set by libavcodec.
1427 * - decoding: Set by libavcodec.
1429 AVFrame *coded_frame;
1433 * - encoding: Set by user.
1434 * - decoding: Set by user.
1437 #define FF_DEBUG_PICT_INFO 1
1438 #define FF_DEBUG_RC 2
1439 #define FF_DEBUG_BITSTREAM 4
1440 #define FF_DEBUG_MB_TYPE 8
1441 #define FF_DEBUG_QP 16
1442 #define FF_DEBUG_MV 32
1443 #define FF_DEBUG_DCT_COEFF 0x00000040
1444 #define FF_DEBUG_SKIP 0x00000080
1445 #define FF_DEBUG_STARTCODE 0x00000100
1446 #define FF_DEBUG_PTS 0x00000200
1447 #define FF_DEBUG_ER 0x00000400
1448 #define FF_DEBUG_MMCO 0x00000800
1449 #define FF_DEBUG_BUGS 0x00001000
1450 #define FF_DEBUG_VIS_QP 0x00002000
1451 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1455 * - encoding: Set by user.
1456 * - decoding: Set by user.
1459 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1460 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1461 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1465 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1466 * - decoding: unused
1471 * minimum MB quantizer
1472 * - encoding: unused
1473 * - decoding: unused
1478 * maximum MB quantizer
1479 * - encoding: unused
1480 * - decoding: unused
1485 * motion estimation comparison function
1486 * - encoding: Set by user.
1487 * - decoding: unused
1491 * subpixel motion estimation comparison function
1492 * - encoding: Set by user.
1493 * - decoding: unused
1497 * macroblock comparison function (not supported yet)
1498 * - encoding: Set by user.
1499 * - decoding: unused
1503 * interlaced DCT comparison function
1504 * - encoding: Set by user.
1505 * - decoding: unused
1508 #define FF_CMP_SAD 0
1509 #define FF_CMP_SSE 1
1510 #define FF_CMP_SATD 2
1511 #define FF_CMP_DCT 3
1512 #define FF_CMP_PSNR 4
1513 #define FF_CMP_BIT 5
1515 #define FF_CMP_ZERO 7
1516 #define FF_CMP_VSAD 8
1517 #define FF_CMP_VSSE 9
1518 #define FF_CMP_NSSE 10
1519 #define FF_CMP_W53 11
1520 #define FF_CMP_W97 12
1521 #define FF_CMP_DCTMAX 13
1522 #define FF_CMP_DCT264 14
1523 #define FF_CMP_CHROMA 256
1526 * ME diamond size & shape
1527 * - encoding: Set by user.
1528 * - decoding: unused
1533 * amount of previous MV predictors (2a+1 x 2a+1 square)
1534 * - encoding: Set by user.
1535 * - decoding: unused
1537 int last_predictor_count;
1540 * prepass for motion estimation
1541 * - encoding: Set by user.
1542 * - decoding: unused
1547 * motion estimation prepass comparison function
1548 * - encoding: Set by user.
1549 * - decoding: unused
1554 * ME prepass diamond size & shape
1555 * - encoding: Set by user.
1556 * - decoding: unused
1562 * - encoding: Set by user.
1563 * - decoding: unused
1565 int me_subpel_quality;
1568 * callback to negotiate the pixelFormat
1569 * @param fmt is the list of formats which are supported by the codec,
1570 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1571 * The first is always the native one.
1572 * @return the chosen format
1573 * - encoding: unused
1574 * - decoding: Set by user, if not set the native format will be chosen.
1576 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1579 * DTG active format information (additional aspect ratio
1580 * information only used in DVB MPEG-2 transport streams)
1583 * - encoding: unused
1584 * - decoding: Set by decoder.
1586 int dtg_active_format;
1587 #define FF_DTG_AFD_SAME 8
1588 #define FF_DTG_AFD_4_3 9
1589 #define FF_DTG_AFD_16_9 10
1590 #define FF_DTG_AFD_14_9 11
1591 #define FF_DTG_AFD_4_3_SP_14_9 13
1592 #define FF_DTG_AFD_16_9_SP_14_9 14
1593 #define FF_DTG_AFD_SP_4_3 15
1596 * maximum motion estimation search range in subpel units
1597 * If 0 then no limit.
1599 * - encoding: Set by user.
1600 * - decoding: unused
1605 * intra quantizer bias
1606 * - encoding: Set by user.
1607 * - decoding: unused
1609 int intra_quant_bias;
1610 #define FF_DEFAULT_QUANT_BIAS 999999
1613 * inter quantizer bias
1614 * - encoding: Set by user.
1615 * - decoding: unused
1617 int inter_quant_bias;
1621 * - encoding: unused
1622 * - decoding: Which clrtable should be used for 8bit RGB images.
1623 * Tables have to be stored somewhere. FIXME
1628 * internal_buffer count
1629 * Don't touch, used by libavcodec default_get_buffer().
1631 int internal_buffer_count;
1635 * Don't touch, used by libavcodec default_get_buffer().
1637 void *internal_buffer;
1639 #define FF_LAMBDA_SHIFT 7
1640 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1641 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1642 #define FF_LAMBDA_MAX (256*128-1)
1644 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1646 * Global quality for codecs which cannot change it per frame.
1647 * This should be proportional to MPEG-1/2/4 qscale.
1648 * - encoding: Set by user.
1649 * - decoding: unused
1653 #define FF_CODER_TYPE_VLC 0
1654 #define FF_CODER_TYPE_AC 1
1655 #define FF_CODER_TYPE_RAW 2
1656 #define FF_CODER_TYPE_RLE 3
1657 #define FF_CODER_TYPE_DEFLATE 4
1660 * - encoding: Set by user.
1661 * - decoding: unused
1667 * - encoding: Set by user.
1668 * - decoding: unused
1674 * - encoding: unused
1675 * - decoding: Set by user.
1677 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1682 * - encoding: unused
1683 * - decoding: Set by user.
1686 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1687 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1688 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1691 * XVideo Motion Acceleration
1692 * - encoding: forbidden
1693 * - decoding: set by decoder
1695 int xvmc_acceleration;
1698 * macroblock decision mode
1699 * - encoding: Set by user.
1700 * - decoding: unused
1703 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1704 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1705 #define FF_MB_DECISION_RD 2 ///< rate distortion
1708 * custom intra quantization matrix
1709 * - encoding: Set by user, can be NULL.
1710 * - decoding: Set by libavcodec.
1712 uint16_t *intra_matrix;
1715 * custom inter quantization matrix
1716 * - encoding: Set by user, can be NULL.
1717 * - decoding: Set by libavcodec.
1719 uint16_t *inter_matrix;
1722 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1723 * This is used to work around some encoder bugs.
1724 * - encoding: unused
1725 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1727 unsigned int stream_codec_tag;
1730 * scene change detection threshold
1731 * 0 is default, larger means fewer detected scene changes.
1732 * - encoding: Set by user.
1733 * - decoding: unused
1735 int scenechange_threshold;
1738 * minimum Lagrange multipler
1739 * - encoding: Set by user.
1740 * - decoding: unused
1745 * maximum Lagrange multipler
1746 * - encoding: Set by user.
1747 * - decoding: unused
1752 * palette control structure
1753 * - encoding: ??? (no palette-enabled encoder yet)
1754 * - decoding: Set by user.
1756 struct AVPaletteControl *palctrl;
1759 * noise reduction strength
1760 * - encoding: Set by user.
1761 * - decoding: unused
1763 int noise_reduction;
1766 * Called at the beginning of a frame to get cr buffer for it.
1767 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1768 * libavcodec will pass previous buffer in pic, function should return
1769 * same buffer or new buffer with old frame "painted" into it.
1770 * If pic.data[0] == NULL must behave like get_buffer().
1771 * - encoding: unused
1772 * - decoding: Set by libavcodec., user can override
1774 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1777 * Number of bits which should be loaded into the rc buffer before decoding starts.
1778 * - encoding: Set by user.
1779 * - decoding: unused
1781 int rc_initial_buffer_occupancy;
1785 * - encoding: Set by user.
1786 * - decoding: unused
1788 int inter_threshold;
1792 * - encoding: Set by user.
1793 * - decoding: Set by user.
1798 * Simulates errors in the bitstream to test error concealment.
1799 * - encoding: Set by user.
1800 * - decoding: unused
1805 * MP3 antialias algorithm, see FF_AA_* below.
1806 * - encoding: unused
1807 * - decoding: Set by user.
1810 #define FF_AA_AUTO 0
1811 #define FF_AA_FASTINT 1 //not implemented yet
1813 #define FF_AA_FLOAT 3
1815 * quantizer noise shaping
1816 * - encoding: Set by user.
1817 * - decoding: unused
1819 int quantizer_noise_shaping;
1823 * is used to decide how many independent tasks should be passed to execute()
1824 * - encoding: Set by user.
1825 * - decoding: Set by user.
1830 * The codec may call this to execute several independent things.
1831 * It will return only after finishing all tasks.
1832 * The user may replace this with some multithreaded implementation,
1833 * the default implementation will execute the parts serially.
1834 * @param count the number of things to execute
1835 * - encoding: Set by libavcodec, user can override.
1836 * - decoding: Set by libavcodec, user can override.
1838 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void **arg2, int *ret, int count);
1842 * Can be used by execute() to store some per AVCodecContext stuff.
1843 * - encoding: set by execute()
1844 * - decoding: set by execute()
1846 void *thread_opaque;
1849 * Motion estimation threshold below which no motion estimation is
1850 * performed, but instead the user specified motion vectors are used.
1852 * - encoding: Set by user.
1853 * - decoding: unused
1858 * Macroblock threshold below which the user specified macroblock types will be used.
1859 * - encoding: Set by user.
1860 * - decoding: unused
1865 * precision of the intra DC coefficient - 8
1866 * - encoding: Set by user.
1867 * - decoding: unused
1869 int intra_dc_precision;
1872 * noise vs. sse weight for the nsse comparsion function
1873 * - encoding: Set by user.
1874 * - decoding: unused
1879 * Number of macroblock rows at the top which are skipped.
1880 * - encoding: unused
1881 * - decoding: Set by user.
1886 * Number of macroblock rows at the bottom which are skipped.
1887 * - encoding: unused
1888 * - decoding: Set by user.
1894 * - encoding: Set by user.
1895 * - decoding: Set by libavcodec.
1898 #define FF_PROFILE_UNKNOWN -99
1899 #define FF_PROFILE_AAC_MAIN 0
1900 #define FF_PROFILE_AAC_LOW 1
1901 #define FF_PROFILE_AAC_SSR 2
1902 #define FF_PROFILE_AAC_LTP 3
1906 * - encoding: Set by user.
1907 * - decoding: Set by libavcodec.
1910 #define FF_LEVEL_UNKNOWN -99
1913 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1914 * - encoding: unused
1915 * - decoding: Set by user.
1920 * Bitstream width / height, may be different from width/height if lowres
1921 * or other things are used.
1922 * - encoding: unused
1923 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1925 int coded_width, coded_height;
1928 * frame skip threshold
1929 * - encoding: Set by user.
1930 * - decoding: unused
1932 int frame_skip_threshold;
1936 * - encoding: Set by user.
1937 * - decoding: unused
1939 int frame_skip_factor;
1942 * frame skip exponent
1943 * - encoding: Set by user.
1944 * - decoding: unused
1949 * frame skip comparison function
1950 * - encoding: Set by user.
1951 * - decoding: unused
1956 * Border processing masking, raises the quantizer for mbs on the borders
1958 * - encoding: Set by user.
1959 * - decoding: unused
1961 float border_masking;
1964 * minimum MB lagrange multipler
1965 * - encoding: Set by user.
1966 * - decoding: unused
1971 * maximum MB lagrange multipler
1972 * - encoding: Set by user.
1973 * - decoding: unused
1979 * - encoding: Set by user.
1980 * - decoding: unused
1982 int me_penalty_compensation;
1986 * - encoding: unused
1987 * - decoding: Set by user.
1989 enum AVDiscard skip_loop_filter;
1993 * - encoding: unused
1994 * - decoding: Set by user.
1996 enum AVDiscard skip_idct;
2000 * - encoding: unused
2001 * - decoding: Set by user.
2003 enum AVDiscard skip_frame;
2007 * - encoding: Set by user.
2008 * - decoding: unused
2014 * - encoding: Set by user.
2015 * - decoding: unused
2020 * constant rate factor - quality-based VBR - values ~correspond to qps
2021 * - encoding: Set by user.
2022 * - decoding: unused
2027 * constant quantization parameter rate control method
2028 * - encoding: Set by user.
2029 * - decoding: unused
2035 * - encoding: Set by user.
2036 * - decoding: unused
2041 * number of reference frames
2042 * - encoding: Set by user.
2043 * - decoding: unused
2048 * chroma qp offset from luma
2049 * - encoding: Set by user.
2050 * - decoding: unused
2055 * Influences how often B-frames are used.
2056 * - encoding: Set by user.
2057 * - decoding: unused
2062 * trellis RD quantization
2063 * - encoding: Set by user.
2064 * - decoding: unused
2069 * Reduce fluctuations in qp (before curve compression).
2070 * - encoding: Set by user.
2071 * - decoding: unused
2073 float complexityblur;
2076 * in-loop deblocking filter alphac0 parameter
2077 * alpha is in the range -6...6
2078 * - encoding: Set by user.
2079 * - decoding: unused
2084 * in-loop deblocking filter beta parameter
2085 * beta is in the range -6...6
2086 * - encoding: Set by user.
2087 * - decoding: unused
2092 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2093 * - encoding: Set by user.
2094 * - decoding: unused
2097 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2098 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2099 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2100 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2101 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2104 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal)
2105 * - encoding: Set by user.
2106 * - decoding: unused
2111 * Audio cutoff bandwidth (0 means "automatic")
2112 * - encoding: Set by user.
2113 * - decoding: unused
2118 * Multiplied by qscale for each frame and added to scene_change_score.
2119 * - encoding: Set by user.
2120 * - decoding: unused
2122 int scenechange_factor;
2126 * Note: Value depends upon the compare function used for fullpel ME.
2127 * - encoding: Set by user.
2128 * - decoding: unused
2133 * Adjusts sensitivity of b_frame_strategy 1.
2134 * - encoding: Set by user.
2135 * - decoding: unused
2140 * - encoding: Set by user.
2141 * - decoding: unused
2143 int compression_level;
2144 #define FF_COMPRESSION_DEFAULT -1
2147 * Sets whether to use LPC mode - used by FLAC encoder.
2148 * - encoding: Set by user.
2149 * - decoding: unused
2154 * LPC coefficient precision - used by FLAC encoder
2155 * - encoding: Set by user.
2156 * - decoding: unused
2158 int lpc_coeff_precision;
2161 * - encoding: Set by user.
2162 * - decoding: unused
2164 int min_prediction_order;
2167 * - encoding: Set by user.
2168 * - decoding: unused
2170 int max_prediction_order;
2173 * search method for selecting prediction order
2174 * - encoding: Set by user.
2175 * - decoding: unused
2177 int prediction_order_method;
2180 * - encoding: Set by user.
2181 * - decoding: unused
2183 int min_partition_order;
2186 * - encoding: Set by user.
2187 * - decoding: unused
2189 int max_partition_order;
2192 * GOP timecode frame start number, in non drop frame format
2193 * - encoding: Set by user.
2194 * - decoding: unused
2196 int64_t timecode_frame_start;
2199 * Decoder should decode to this many channels if it can (0 for default)
2200 * - encoding: unused
2201 * - decoding: Set by user.
2203 int request_channels;
2206 * Percentage of dynamic range compression to be applied by the decoder.
2207 * The default value is 1.0, corresponding to full compression.
2208 * - encoding: unused
2209 * - decoding: Set by user.
2217 typedef struct AVCodec {
2219 * Name of the codec implementation.
2220 * The name is globally unique among encoders and among decoders (but an
2221 * encoder and a decoder can share the same name).
2222 * This is the primary way to find a codec from the user perspective.
2225 enum CodecType type;
2228 int (*init)(AVCodecContext *);
2229 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2230 int (*close)(AVCodecContext *);
2231 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size,
2232 const uint8_t *buf, int buf_size);
2234 * Codec capabilities.
2238 struct AVCodec *next;
2241 * Will be called when seeking
2243 void (*flush)(AVCodecContext *);
2244 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2245 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2246 const char *long_name; ///< descriptive name for the codec, meant to be more human readable than \p name
2247 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2251 * four components are given, that's all.
2252 * the last component is alpha
2254 typedef struct AVPicture {
2256 int linesize[4]; ///< number of bytes per line
2261 * This structure defines a method for communicating palette changes
2262 * between and demuxer and a decoder.
2264 * @deprecated Use AVPacket to send palette changes instead.
2265 * This is totally broken.
2267 #define AVPALETTE_SIZE 1024
2268 #define AVPALETTE_COUNT 256
2269 typedef struct AVPaletteControl {
2271 /* Demuxer sets this to 1 to indicate the palette has changed;
2272 * decoder resets to 0. */
2273 int palette_changed;
2275 /* 4-byte ARGB palette entries, stored in native byte order; note that
2276 * the individual palette components should be on a 8-bit scale; if
2277 * the palette data comes from an IBM VGA native format, the component
2278 * data is probably 6 bits in size and needs to be scaled. */
2279 unsigned int palette[AVPALETTE_COUNT];
2281 } AVPaletteControl attribute_deprecated;
2283 typedef struct AVSubtitleRect {
2290 uint32_t *rgba_palette;
2294 typedef struct AVSubtitle {
2295 uint16_t format; /* 0 = graphics */
2296 uint32_t start_display_time; /* relative to packet pts, in ms */
2297 uint32_t end_display_time; /* relative to packet pts, in ms */
2299 AVSubtitleRect *rects;
2305 struct ReSampleContext;
2306 struct AVResampleContext;
2308 typedef struct ReSampleContext ReSampleContext;
2310 ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2311 int output_rate, int input_rate);
2312 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2313 void audio_resample_close(ReSampleContext *s);
2315 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2316 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2317 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2318 void av_resample_close(struct AVResampleContext *c);
2320 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2321 /* YUV420 format is assumed ! */
2324 * @deprecated Use the software scaler (swscale) instead.
2326 typedef struct ImgReSampleContext ImgReSampleContext attribute_deprecated;
2329 * @deprecated Use the software scaler (swscale) instead.
2331 attribute_deprecated ImgReSampleContext *img_resample_init(int output_width, int output_height,
2332 int input_width, int input_height);
2335 * @deprecated Use the software scaler (swscale) instead.
2337 attribute_deprecated ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
2338 int iwidth, int iheight,
2339 int topBand, int bottomBand,
2340 int leftBand, int rightBand,
2341 int padtop, int padbottom,
2342 int padleft, int padright);
2345 * @deprecated Use the software scaler (swscale) instead.
2347 attribute_deprecated void img_resample(struct ImgReSampleContext *s,
2348 AVPicture *output, const AVPicture *input);
2351 * @deprecated Use the software scaler (swscale) instead.
2353 attribute_deprecated void img_resample_close(struct ImgReSampleContext *s);
2358 * Allocate memory for a picture. Call avpicture_free to free it.
2360 * @param picture the picture to be filled in
2361 * @param pix_fmt the format of the picture
2362 * @param width the width of the picture
2363 * @param height the height of the picture
2364 * @return zero if successful, a negative value if not
2366 int avpicture_alloc(AVPicture *picture, int pix_fmt, int width, int height);
2369 * Free a picture previously allocated by avpicture_alloc().
2371 * @param picture the AVPicture to be freed
2373 void avpicture_free(AVPicture *picture);
2376 * Fill in the AVPicture fields.
2377 * The fields of the given AVPicture are filled in by using the 'ptr' address
2378 * which points to the image data buffer. Depending on the specified picture
2379 * format, one or multiple image data pointers and line sizes will be set.
2380 * If a planar format is specified, several pointers will be set pointing to
2381 * the different picture planes and the line sizes of the different planes
2382 * will be stored in the lines_sizes array.
2384 * @param picture AVPicture whose fields are to be filled in
2385 * @param ptr Buffer which will contain or contains the actual image data
2386 * @param pix_fmt The format in which the picture data is stored.
2387 * @param width the width of the image in pixels
2388 * @param height the height of the image in pixels
2389 * @return size of the image data in bytes
2391 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2392 int pix_fmt, int width, int height);
2393 int avpicture_layout(const AVPicture* src, int pix_fmt, int width, int height,
2394 unsigned char *dest, int dest_size);
2397 * Calculate the size in bytes that a picture of the given width and height
2398 * would occupy if stored in the given picture format.
2400 * @param pix_fmt the given picture format
2401 * @param width the width of the image
2402 * @param height the height of the image
2403 * @return Image data size in bytes
2405 int avpicture_get_size(int pix_fmt, int width, int height);
2406 void avcodec_get_chroma_sub_sample(int pix_fmt, int *h_shift, int *v_shift);
2407 const char *avcodec_get_pix_fmt_name(int pix_fmt);
2408 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2409 enum PixelFormat avcodec_get_pix_fmt(const char* name);
2410 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);
2412 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
2413 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
2414 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
2415 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
2416 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
2417 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
2420 * Computes what kind of losses will occur when converting from one specific
2421 * pixel format to another.
2422 * When converting from one pixel format to another, information loss may occur.
2423 * For example, when converting from RGB24 to GRAY, the color information will
2424 * be lost. Similarly, other losses occur when converting from some formats to
2425 * other formats. These losses can involve loss of chroma, but also loss of
2426 * resolution, loss of color depth, loss due to the color space conversion, loss
2427 * of the alpha bits or loss due to color quantization.
2428 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
2429 * which will occur when converting from one pixel format to another.
2431 * @param[in] dst_pix_fmt destination pixel format
2432 * @param[in] src_pix_fmt source pixel format
2433 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2434 * @return Combination of flags informing you what kind of losses will occur.
2436 int avcodec_get_pix_fmt_loss(int dst_pix_fmt, int src_pix_fmt,
2440 * Finds the best pixel format to convert to given a certain source pixel
2441 * format. When converting from one pixel format to another, information loss
2442 * may occur. For example, when converting from RGB24 to GRAY, the color
2443 * information will be lost. Similarly, other losses occur when converting from
2444 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
2445 * the given pixel formats should be used to suffer the least amount of loss.
2446 * The pixel formats from which it chooses one, are determined by the
2447 * \p pix_fmt_mask parameter.
2450 * src_pix_fmt = PIX_FMT_YUV420P;
2451 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
2452 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
2455 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
2456 * @param[in] src_pix_fmt source pixel format
2457 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2458 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
2459 * @return The best pixel format to convert to or -1 if none was found.
2461 int avcodec_find_best_pix_fmt(int pix_fmt_mask, int src_pix_fmt,
2462 int has_alpha, int *loss_ptr);
2466 * Print in buf the string corresponding to the pixel format with
2467 * number pix_fmt, or an header if pix_fmt is negative.
2469 * @param[in] buf the buffer where to write the string
2470 * @param[in] buf_size the size of buf
2471 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
2472 * a negative value to print the corresponding header.
2473 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
2475 void avcodec_pix_fmt_string (char *buf, int buf_size, int pix_fmt);
2477 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
2478 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
2481 * Tell if an image really has transparent alpha values.
2482 * @return ored mask of FF_ALPHA_xxx constants
2484 int img_get_alpha_info(const AVPicture *src,
2485 int pix_fmt, int width, int height);
2487 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2489 * convert among pixel formats
2490 * @deprecated Use the software scaler (swscale) instead.
2492 attribute_deprecated int img_convert(AVPicture *dst, int dst_pix_fmt,
2493 const AVPicture *src, int pix_fmt,
2494 int width, int height);
2497 /* deinterlace a picture */
2498 /* deinterlace - if not supported return -1 */
2499 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
2500 int pix_fmt, int width, int height);
2502 /* external high level API */
2504 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2505 extern AVCodec *first_avcodec;
2507 AVCodec *av_codec_next(AVCodec *c);
2509 /* returns LIBAVCODEC_VERSION_INT constant */
2510 unsigned avcodec_version(void);
2511 /* returns LIBAVCODEC_BUILD constant */
2512 unsigned avcodec_build(void);
2515 * Initializes libavcodec.
2517 * @warning This function \e must be called before any other libavcodec
2520 void avcodec_init(void);
2522 void register_avcodec(AVCodec *format);
2525 * Finds a registered encoder with a matching codec ID.
2527 * @param id CodecID of the requested encoder
2528 * @return An encoder if one was found, NULL otherwise.
2530 AVCodec *avcodec_find_encoder(enum CodecID id);
2533 * Finds a registered encoder with the specified name.
2535 * @param name name of the requested encoder
2536 * @return An encoder if one was found, NULL otherwise.
2538 AVCodec *avcodec_find_encoder_by_name(const char *name);
2541 * Finds a registered decoder with a matching codec ID.
2543 * @param id CodecID of the requested decoder
2544 * @return A decoder if one was found, NULL otherwise.
2546 AVCodec *avcodec_find_decoder(enum CodecID id);
2549 * Finds a registered decoder with the specified name.
2551 * @param name name of the requested decoder
2552 * @return A decoder if one was found, NULL otherwise.
2554 AVCodec *avcodec_find_decoder_by_name(const char *name);
2555 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
2558 * Sets the fields of the given AVCodecContext to default values.
2560 * @param s The AVCodecContext of which the fields should be set to default values.
2562 void avcodec_get_context_defaults(AVCodecContext *s);
2564 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2565 * we WILL change its arguments and name a few times! */
2566 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
2569 * Allocates an AVCodecContext and sets its fields to default values. The
2570 * resulting struct can be deallocated by simply calling av_free().
2572 * @return An AVCodecContext filled with default values or NULL on failure.
2573 * @see avcodec_get_context_defaults
2575 AVCodecContext *avcodec_alloc_context(void);
2577 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2578 * we WILL change its arguments and name a few times! */
2579 AVCodecContext *avcodec_alloc_context2(enum CodecType);
2582 * Sets the fields of the given AVFrame to default values.
2584 * @param pic The AVFrame of which the fields should be set to default values.
2586 void avcodec_get_frame_defaults(AVFrame *pic);
2589 * Allocates an AVFrame and sets its fields to default values. The resulting
2590 * struct can be deallocated by simply calling av_free().
2592 * @return An AVFrame filled with default values or NULL on failure.
2593 * @see avcodec_get_frame_defaults
2595 AVFrame *avcodec_alloc_frame(void);
2597 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
2598 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
2599 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
2600 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
2603 * Checks if the given dimension of a picture is valid, meaning that all
2604 * bytes of the picture can be addressed with a signed int.
2606 * @param[in] w Width of the picture.
2607 * @param[in] h Height of the picture.
2608 * @return Zero if valid, a negative value if invalid.
2610 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
2611 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
2613 int avcodec_thread_init(AVCodecContext *s, int thread_count);
2614 void avcodec_thread_free(AVCodecContext *s);
2615 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2616 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2617 //FIXME func typedef
2620 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
2621 * function the context has to be allocated.
2623 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2624 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2625 * retrieving a codec.
2627 * @warning This function is not thread safe!
2630 * avcodec_register_all();
2631 * codec = avcodec_find_decoder(CODEC_ID_H264);
2635 * context = avcodec_alloc_context();
2637 * if (avcodec_open(context, codec) < 0)
2641 * @param avctx The context which will be set up to use the given codec.
2642 * @param codec The codec to use within the context.
2643 * @return zero on success, a negative value on error
2644 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
2646 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
2649 * @deprecated Use avcodec_decode_audio2() instead.
2651 attribute_deprecated int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
2652 int *frame_size_ptr,
2653 const uint8_t *buf, int buf_size);
2656 * Decodes an audio frame from \p buf into \p samples.
2657 * The avcodec_decode_audio2() function decodes an audio frame from the input
2658 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2659 * audio codec which was coupled with \p avctx using avcodec_open(). The
2660 * resulting decoded frame is stored in output buffer \p samples. If no frame
2661 * could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
2662 * decompressed frame size in \e bytes.
2664 * @warning You \e must set \p frame_size_ptr to the allocated size of the
2665 * output buffer before calling avcodec_decode_audio2().
2667 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2668 * the actual read bytes because some optimized bitstream readers read 32 or 64
2669 * bits at once and could read over the end.
2671 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2672 * no overreading happens for damaged MPEG streams.
2674 * @note You might have to align the input buffer \p buf and output buffer \p
2675 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
2676 * necessary at all, on others it won't work at all if not aligned and on others
2677 * it will work but it will have an impact on performance. In practice, the
2678 * bitstream should have 4 byte alignment at minimum and all sample data should
2679 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2680 * the linesize is not a multiple of 16 then there's no sense in aligning the
2681 * start of the buffer to 16.
2683 * @param avctx the codec context
2684 * @param[out] samples the output buffer
2685 * @param[in,out] frame_size_ptr the output buffer size in bytes
2686 * @param[in] buf the input buffer
2687 * @param[in] buf_size the input buffer size in bytes
2688 * @return On error a negative value is returned, otherwise the number of bytes
2689 * used or zero if no frame could be decompressed.
2691 int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
2692 int *frame_size_ptr,
2693 const uint8_t *buf, int buf_size);
2696 * Decodes a video frame from \p buf into \p picture.
2697 * The avcodec_decode_video() function decodes a video frame from the input
2698 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2699 * video codec which was coupled with \p avctx using avcodec_open(). The
2700 * resulting decoded frame is stored in \p picture.
2702 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2703 * the actual read bytes because some optimized bitstream readers read 32 or 64
2704 * bits at once and could read over the end.
2706 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2707 * no overreading happens for damaged MPEG streams.
2709 * @note You might have to align the input buffer \p buf and output buffer \p
2710 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
2711 * necessary at all, on others it won't work at all if not aligned and on others
2712 * it will work but it will have an impact on performance. In practice, the
2713 * bitstream should have 4 byte alignment at minimum and all sample data should
2714 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2715 * the linesize is not a multiple of 16 then there's no sense in aligning the
2716 * start of the buffer to 16.
2718 * @param avctx the codec context
2719 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
2720 * @param[in] buf the input buffer
2721 * @param[in] buf_size the size of the input buffer in bytes
2722 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
2723 * @return On error a negative value is returned, otherwise the number of bytes
2724 * used or zero if no frame could be decompressed.
2726 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
2727 int *got_picture_ptr,
2728 const uint8_t *buf, int buf_size);
2730 /* Decode a subtitle message. Return -1 if error, otherwise return the
2731 * number of bytes used. If no subtitle could be decompressed,
2732 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
2733 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
2735 const uint8_t *buf, int buf_size);
2736 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
2738 uint8_t *buf, int buf_size);
2741 * Encodes an audio frame from \p samples into \p buf.
2742 * The avcodec_encode_audio() function encodes an audio frame from the input
2743 * buffer \p samples. To encode it, it makes use of the audio codec which was
2744 * coupled with \p avctx using avcodec_open(). The resulting encoded frame is
2745 * stored in output buffer \p buf.
2747 * @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
2749 * @param avctx the codec context
2750 * @param[out] buf the output buffer
2751 * @param[in] buf_size the output buffer size
2752 * @param[in] samples the input buffer containing the samples
2753 * The number of samples read from this buffer is frame_size*channels,
2754 * both of which are defined in \p avctx.
2755 * For PCM audio the number of samples read from \p samples is equal to
2756 * \p buf_size * input_sample_size / output_sample_size.
2757 * @return On error a negative value is returned, on success zero or the number
2758 * of bytes used to encode the data read from the input buffer.
2760 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2761 const short *samples);
2764 * Encodes a video frame from \p pict into \p buf.
2765 * The avcodec_encode_video() function encodes a video frame from the input
2766 * \p pict. To encode it, it makes use of the video codec which was coupled with
2767 * \p avctx using avcodec_open(). The resulting encoded bytes representing the
2768 * frame are stored in the output buffer \p buf. The input picture should be
2769 * stored using a specific format, namely \c avctx.pix_fmt.
2771 * @param avctx the codec context
2772 * @param[out] buf the output buffer for the bitstream of encoded frame
2773 * @param[in] buf_size the size of the output buffer in bytes
2774 * @param[in] pict the input picture to encode
2775 * @return On error a negative value is returned, on success zero or the number
2776 * of bytes used from the input buffer.
2778 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2779 const AVFrame *pict);
2780 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2781 const AVSubtitle *sub);
2783 int avcodec_close(AVCodecContext *avctx);
2785 void avcodec_register_all(void);
2788 * Flush buffers, should be called when seeking or when switching to a different stream.
2790 void avcodec_flush_buffers(AVCodecContext *avctx);
2792 void avcodec_default_free_buffers(AVCodecContext *s);
2794 /* misc useful functions */
2797 * Returns a single letter to describe the given picture type \p pict_type.
2799 * @param[in] pict_type the picture type
2800 * @return A single character representing the picture type.
2802 char av_get_pict_type_char(int pict_type);
2805 * Returns codec bits per sample.
2807 * @param[in] codec_id the codec
2808 * @return Number of bits per sample or zero if unknown for the given codec.
2810 int av_get_bits_per_sample(enum CodecID codec_id);
2813 * Returns sample format bits per sample.
2815 * @param[in] sample_fmt the sample format
2816 * @return Number of bits per sample or zero if unknown for the given sample format.
2818 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
2821 typedef struct AVCodecParserContext {
2823 struct AVCodecParser *parser;
2824 int64_t frame_offset; /* offset of the current frame */
2825 int64_t cur_offset; /* current offset
2826 (incremented by each av_parser_parse()) */
2827 int64_t next_frame_offset; /* offset of the next frame */
2829 int pict_type; /* XXX: Put it back in AVCodecContext. */
2830 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
2831 int64_t pts; /* pts of the current frame */
2832 int64_t dts; /* dts of the current frame */
2837 int fetch_timestamp;
2839 #define AV_PARSER_PTS_NB 4
2840 int cur_frame_start_index;
2841 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
2842 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
2843 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
2846 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
2848 int64_t offset; ///< byte offset from starting packet start
2849 int64_t cur_frame_end[AV_PARSER_PTS_NB];
2850 } AVCodecParserContext;
2852 typedef struct AVCodecParser {
2853 int codec_ids[5]; /* several codec IDs are permitted */
2855 int (*parser_init)(AVCodecParserContext *s);
2856 int (*parser_parse)(AVCodecParserContext *s,
2857 AVCodecContext *avctx,
2858 const uint8_t **poutbuf, int *poutbuf_size,
2859 const uint8_t *buf, int buf_size);
2860 void (*parser_close)(AVCodecParserContext *s);
2861 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
2862 struct AVCodecParser *next;
2865 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2866 extern AVCodecParser *av_first_parser;
2868 AVCodecParser *av_parser_next(AVCodecParser *c);
2870 void av_register_codec_parser(AVCodecParser *parser);
2871 AVCodecParserContext *av_parser_init(int codec_id);
2872 int av_parser_parse(AVCodecParserContext *s,
2873 AVCodecContext *avctx,
2874 uint8_t **poutbuf, int *poutbuf_size,
2875 const uint8_t *buf, int buf_size,
2876 int64_t pts, int64_t dts);
2877 int av_parser_change(AVCodecParserContext *s,
2878 AVCodecContext *avctx,
2879 uint8_t **poutbuf, int *poutbuf_size,
2880 const uint8_t *buf, int buf_size, int keyframe);
2881 void av_parser_close(AVCodecParserContext *s);
2884 typedef struct AVBitStreamFilterContext {
2886 struct AVBitStreamFilter *filter;
2887 AVCodecParserContext *parser;
2888 struct AVBitStreamFilterContext *next;
2889 } AVBitStreamFilterContext;
2892 typedef struct AVBitStreamFilter {
2895 int (*filter)(AVBitStreamFilterContext *bsfc,
2896 AVCodecContext *avctx, const char *args,
2897 uint8_t **poutbuf, int *poutbuf_size,
2898 const uint8_t *buf, int buf_size, int keyframe);
2899 void (*close)(AVBitStreamFilterContext *bsfc);
2900 struct AVBitStreamFilter *next;
2901 } AVBitStreamFilter;
2903 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
2904 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
2905 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
2906 AVCodecContext *avctx, const char *args,
2907 uint8_t **poutbuf, int *poutbuf_size,
2908 const uint8_t *buf, int buf_size, int keyframe);
2909 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
2911 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
2916 * Reallocates the given block if it is not large enough, otherwise it
2921 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
2924 * Copy image 'src' to 'dst'.
2926 void av_picture_copy(AVPicture *dst, const AVPicture *src,
2927 int pix_fmt, int width, int height);
2930 * Crop image top and left side.
2932 int av_picture_crop(AVPicture *dst, const AVPicture *src,
2933 int pix_fmt, int top_band, int left_band);
2938 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
2939 int padtop, int padbottom, int padleft, int padright, int *color);
2941 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2943 * @deprecated Use the software scaler (swscale) instead.
2945 attribute_deprecated void img_copy(AVPicture *dst, const AVPicture *src,
2946 int pix_fmt, int width, int height);
2949 * @deprecated Use the software scaler (swscale) instead.
2951 attribute_deprecated int img_crop(AVPicture *dst, const AVPicture *src,
2952 int pix_fmt, int top_band, int left_band);
2955 * @deprecated Use the software scaler (swscale) instead.
2957 attribute_deprecated int img_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
2958 int padtop, int padbottom, int padleft, int padright, int *color);
2961 extern unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
2964 * Parses \p str and put in \p width_ptr and \p height_ptr the detected values.
2966 * @return 0 in case of a successful parsing, a negative value otherwise
2967 * @param[in] str the string to parse: it has to be a string in the format
2968 * <width>x<height> or a valid video frame size abbreviation.
2969 * @param[in,out] width_ptr pointer to the variable which will contain the detected
2971 * @param[in,out] height_ptr pointer to the variable which will contain the detected
2972 * frame height value
2974 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
2977 * Parses \p str and put in \p frame_rate the detected values.
2979 * @return 0 in case of a successful parsing, a negative value otherwise
2980 * @param[in] str the string to parse: it has to be a string in the format
2981 * <frame_rate_nom>/<frame_rate_den>, a float number or a valid video rate abbreviation
2982 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
2985 int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
2987 /* error handling */
2989 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
2990 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
2992 /* Some platforms have E* and errno already negated. */
2993 #define AVERROR(e) (e)
2994 #define AVUNERROR(e) (e)
2996 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
2997 #define AVERROR_IO AVERROR(EIO) /**< I/O error */
2998 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< Number syntax expected in filename. */
2999 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
3000 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
3001 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
3002 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< Operation not supported. */
3003 #define AVERROR_NOENT AVERROR(ENOENT) /**< No such file or directory. */
3004 #define AVERROR_PATCHWELCOME -MKTAG('P','A','W','E') /**< Not yet implemented in FFmpeg. Patches welcome. */
3006 #endif /* FFMPEG_AVCODEC_H */