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"
31 #include <sys/types.h> /* size_t */
33 #define LIBAVCODEC_VERSION_MAJOR 51
34 #define LIBAVCODEC_VERSION_MINOR 50
35 #define LIBAVCODEC_VERSION_MICRO 1
37 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
38 LIBAVCODEC_VERSION_MINOR, \
39 LIBAVCODEC_VERSION_MICRO)
40 #define LIBAVCODEC_VERSION AV_VERSION(LIBAVCODEC_VERSION_MAJOR, \
41 LIBAVCODEC_VERSION_MINOR, \
42 LIBAVCODEC_VERSION_MICRO)
43 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
45 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
47 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
48 #define AV_TIME_BASE 1000000
49 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
52 * Identifies the syntax and semantics of the bitstream.
53 * The principle is roughly:
54 * Two decoders with the same ID can decode the same streams.
55 * Two encoders with the same ID can encode compatible streams.
56 * There may be slight deviations from the principle due to implementation
59 * If you add a codec ID to this list, add it so that
60 * 1. no value of a existing codec ID changes (that would break ABI),
61 * 2. it is as close as possible to similar codecs.
66 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
67 CODEC_ID_MPEG2VIDEO_XVMC,
104 CODEC_ID_INTERPLAY_VIDEO,
116 CODEC_ID_TRUEMOTION1,
144 CODEC_ID_TRUEMOTION2,
161 CODEC_ID_DSICINVIDEO,
162 CODEC_ID_TIERTEXSEQVIDEO,
171 CODEC_ID_BETHSOFTVID,
182 /* various PCM "codecs" */
183 CODEC_ID_PCM_S16LE= 0x10000,
199 CODEC_ID_PCM_S24DAUD,
201 CODEC_ID_PCM_S16LE_PLANAR,
203 /* various ADPCM codecs */
204 CODEC_ID_ADPCM_IMA_QT= 0x11000,
205 CODEC_ID_ADPCM_IMA_WAV,
206 CODEC_ID_ADPCM_IMA_DK3,
207 CODEC_ID_ADPCM_IMA_DK4,
208 CODEC_ID_ADPCM_IMA_WS,
209 CODEC_ID_ADPCM_IMA_SMJPEG,
218 CODEC_ID_ADPCM_YAMAHA,
219 CODEC_ID_ADPCM_SBPRO_4,
220 CODEC_ID_ADPCM_SBPRO_3,
221 CODEC_ID_ADPCM_SBPRO_2,
223 CODEC_ID_ADPCM_IMA_AMV,
224 CODEC_ID_ADPCM_EA_R1,
225 CODEC_ID_ADPCM_EA_R3,
226 CODEC_ID_ADPCM_EA_R2,
227 CODEC_ID_ADPCM_IMA_EA_SEAD,
228 CODEC_ID_ADPCM_IMA_EA_EACS,
229 CODEC_ID_ADPCM_EA_XAS,
232 CODEC_ID_AMR_NB= 0x12000,
235 /* RealAudio codecs*/
236 CODEC_ID_RA_144= 0x13000,
239 /* various DPCM codecs */
240 CODEC_ID_ROQ_DPCM= 0x14000,
241 CODEC_ID_INTERPLAY_DPCM,
245 CODEC_ID_MP2= 0x15000,
246 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
248 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
267 CODEC_ID_WESTWOOD_SND1,
268 CODEC_ID_GSM, ///< as in Berlin toast format
276 CODEC_ID_DSICINAUDIO,
280 CODEC_ID_GSM_MS, /* as found in WAV */
289 CODEC_ID_WMALOSSLESS,
291 /* subtitle codecs */
292 CODEC_ID_DVD_SUBTITLE= 0x17000,
293 CODEC_ID_DVB_SUBTITLE,
294 CODEC_ID_TEXT, ///< raw UTF-8 text
299 /* other specific kind of codecs (generaly used for attachments) */
300 CODEC_ID_TTF= 0x18000,
302 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
303 * stream (only used by libavformat) */
306 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
307 /* CODEC_ID_MP3LAME is obsolete */
308 #define CODEC_ID_MP3LAME CODEC_ID_MP3
309 #define CODEC_ID_MPEG4AAC CODEC_ID_AAC
313 CODEC_TYPE_UNKNOWN = -1,
318 CODEC_TYPE_ATTACHMENT,
323 * Currently unused, may be used if 24/32 bits samples are ever supported.
324 * all in native-endian format
327 SAMPLE_FMT_NONE = -1,
328 SAMPLE_FMT_U8, ///< unsigned 8 bits
329 SAMPLE_FMT_S16, ///< signed 16 bits
330 SAMPLE_FMT_S24, ///< signed 24 bits
331 SAMPLE_FMT_S32, ///< signed 32 bits
332 SAMPLE_FMT_FLT, ///< float
336 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
339 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
340 * This is mainly needed because some optimized bitstream readers read
341 * 32 or 64 bit at once and could read over the end.<br>
342 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
343 * MPEG bitstreams could cause overread and segfault.
345 #define FF_INPUT_BUFFER_PADDING_SIZE 8
348 * minimum encoding buffer size
349 * Used to avoid some checks during header writing.
351 #define FF_MIN_BUFFER_SIZE 16384
354 * motion estimation type.
357 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
361 ME_EPZS, ///< enhanced predictive zonal search
362 ME_X1, ///< reserved for experiments
363 ME_HEX, ///< hexagon based search
364 ME_UMH, ///< uneven multi-hexagon search
365 ME_ITER, ///< iterative search
369 /* We leave some space between them for extensions (drop some
370 * keyframes for intra-only or drop just some bidir frames). */
371 AVDISCARD_NONE =-16, ///< discard nothing
372 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
373 AVDISCARD_NONREF = 8, ///< discard all non reference
374 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
375 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
376 AVDISCARD_ALL = 48, ///< discard all
379 typedef struct RcOverride{
382 int qscale; // If this is 0 then quality_factor will be used instead.
383 float quality_factor;
386 #define FF_MAX_B_FRAMES 16
389 These flags can be passed in AVCodecContext.flags before initialization.
390 Note: Not everything is supported yet.
393 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
394 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
395 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
396 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
397 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
398 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
400 * The parent program guarantees that the input for B-frames containing
401 * streams is not written to for at least s->max_b_frames+1 frames, if
402 * this is not set the input will be copied.
404 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
405 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
406 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
407 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
408 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
409 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
410 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
411 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
412 location instead of only at frame boundaries. */
413 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
414 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
415 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
416 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
417 #define CODEC_FLAG_TRELLIS_QUANT 0x00200000 ///< Use trellis quantization.
418 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
419 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
420 /* Fx : Flag for h263+ extra options */
421 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
422 #define CODEC_FLAG_H263P_AIC 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction (remove this)
424 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
425 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
426 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
427 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
428 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
429 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
430 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
431 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
432 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
433 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
434 #define CODEC_FLAG_CLOSED_GOP ((int)0x80000000)
435 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
436 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
437 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
438 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
439 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
440 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
441 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
442 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
443 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
444 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
445 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
446 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
447 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
448 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
449 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
450 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
451 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
452 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
454 /* Unsupported options :
455 * Syntax Arithmetic coding (SAC)
456 * Reference Picture Selection
457 * Independent Segment Decoding */
459 /* codec capabilities */
461 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
463 * Codec uses get_buffer() for allocating buffers.
464 * direct rendering method 1
466 #define CODEC_CAP_DR1 0x0002
467 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
468 #define CODEC_CAP_PARSE_ONLY 0x0004
469 #define CODEC_CAP_TRUNCATED 0x0008
470 /* Codec can export data for HW decoding (XvMC). */
471 #define CODEC_CAP_HWACCEL 0x0010
473 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
474 * If this is not set, the codec is guaranteed to never be fed with NULL data.
476 #define CODEC_CAP_DELAY 0x0020
478 * Codec can be fed a final frame with a smaller size.
479 * This can be used to prevent truncation of the last audio samples.
481 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
483 //The following defines may change, don't expect compatibility if you use them.
484 #define MB_TYPE_INTRA4x4 0x0001
485 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
486 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
487 #define MB_TYPE_16x16 0x0008
488 #define MB_TYPE_16x8 0x0010
489 #define MB_TYPE_8x16 0x0020
490 #define MB_TYPE_8x8 0x0040
491 #define MB_TYPE_INTERLACED 0x0080
492 #define MB_TYPE_DIRECT2 0x0100 //FIXME
493 #define MB_TYPE_ACPRED 0x0200
494 #define MB_TYPE_GMC 0x0400
495 #define MB_TYPE_SKIP 0x0800
496 #define MB_TYPE_P0L0 0x1000
497 #define MB_TYPE_P1L0 0x2000
498 #define MB_TYPE_P0L1 0x4000
499 #define MB_TYPE_P1L1 0x8000
500 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
501 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
502 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
503 #define MB_TYPE_QUANT 0x00010000
504 #define MB_TYPE_CBP 0x00020000
505 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
509 * This specifies the area which should be displayed.
510 * Note there may be multiple such areas for one frame.
512 typedef struct AVPanScan{
515 * - encoding: Set by user.
516 * - decoding: Set by libavcodec.
521 * width and height in 1/16 pel
522 * - encoding: Set by user.
523 * - decoding: Set by libavcodec.
529 * position of the top left corner in 1/16 pel for up to 3 fields/frames
530 * - encoding: Set by user.
531 * - decoding: Set by libavcodec.
533 int16_t position[3][2];
536 #define FF_COMMON_FRAME \
538 * pointer to the picture planes.\
539 * This might be different from the first allocated byte\
546 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
547 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
553 * 1 -> keyframe, 0-> not\
554 * - encoding: Set by libavcodec.\
555 * - decoding: Set by libavcodec.\
560 * Picture type of the frame, see ?_TYPE below.\
561 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
562 * - decoding: Set by libavcodec.\
567 * presentation timestamp in time_base units (time when frame should be shown to user)\
568 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
569 * - encoding: MUST be set by user.\
570 * - decoding: Set by libavcodec.\
575 * picture number in bitstream order\
576 * - encoding: set by\
577 * - decoding: Set by libavcodec.\
579 int coded_picture_number;\
581 * picture number in display order\
582 * - encoding: set by\
583 * - decoding: Set by libavcodec.\
585 int display_picture_number;\
588 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
589 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
590 * - decoding: Set by libavcodec.\
595 * buffer age (1->was last buffer and dint change, 2->..., ...).\
596 * Set to INT_MAX if the buffer has not been used yet.\
597 * - encoding: unused\
598 * - decoding: MUST be set by get_buffer().\
603 * is this picture used as reference\
604 * - encoding: unused\
605 * - decoding: Set by libavcodec. (before get_buffer() call)).\
611 * - encoding: unused\
612 * - decoding: Set by libavcodec.\
614 int8_t *qscale_table;\
617 * - encoding: unused\
618 * - decoding: Set by libavcodec.\
623 * mbskip_table[mb]>=1 if MB didn't change\
624 * stride= mb_width = (width+15)>>4\
625 * - encoding: unused\
626 * - decoding: Set by libavcodec.\
628 uint8_t *mbskip_table;\
631 * motion vector table\
634 * int mv_sample_log2= 4 - motion_subsample_log2;\
635 * int mb_width= (width+15)>>4;\
636 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
637 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
639 * - encoding: Set by user.\
640 * - decoding: Set by libavcodec.\
642 int16_t (*motion_val[2])[2];\
645 * macroblock type table\
646 * mb_type_base + mb_width + 2\
647 * - encoding: Set by user.\
648 * - decoding: Set by libavcodec.\
653 * log2 of the size of the block which a single vector in motion_val represents: \
654 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
655 * - encoding: unused\
656 * - decoding: Set by libavcodec.\
658 uint8_t motion_subsample_log2;\
661 * for some private data of the user\
662 * - encoding: unused\
663 * - decoding: Set by user.\
669 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
670 * - decoding: unused\
675 * type of the buffer (to keep track of who has to deallocate data[*])\
676 * - encoding: Set by the one who allocates it.\
677 * - decoding: Set by the one who allocates it.\
678 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
683 * When decoding, this signals how much the picture must be delayed.\
684 * extra_delay = repeat_pict / (2*fps)\
685 * - encoding: unused\
686 * - decoding: Set by libavcodec.\
696 * The content of the picture is interlaced.\
697 * - encoding: Set by user.\
698 * - decoding: Set by libavcodec. (default 0)\
700 int interlaced_frame;\
703 * If the content is interlaced, is top field displayed first.\
704 * - encoding: Set by user.\
705 * - decoding: Set by libavcodec.\
707 int top_field_first;\
711 * - encoding: Set by user.\
712 * - decoding: Set by libavcodec.\
714 AVPanScan *pan_scan;\
717 * Tell user application that palette has changed from previous frame.\
718 * - encoding: ??? (no palette-enabled encoder yet)\
719 * - decoding: Set by libavcodec. (default 0).\
721 int palette_has_changed;\
724 * codec suggestion on buffer type if != 0\
725 * - encoding: unused\
726 * - decoding: Set by libavcodec. (before get_buffer() call)).\
732 * - encoding: unused\
733 * - decoding: Set by libavcodec.\
738 * motion referece frame index\
739 * - encoding: Set by user.\
740 * - decoding: Set by libavcodec.\
742 int8_t *ref_index[2];
744 #define FF_QSCALE_TYPE_MPEG1 0
745 #define FF_QSCALE_TYPE_MPEG2 1
746 #define FF_QSCALE_TYPE_H264 2
748 #define FF_BUFFER_TYPE_INTERNAL 1
749 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
750 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
751 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
754 #define FF_I_TYPE 1 // Intra
755 #define FF_P_TYPE 2 // Predicted
756 #define FF_B_TYPE 3 // Bi-dir predicted
757 #define FF_S_TYPE 4 // S(GMC)-VOP MPEG4
761 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
762 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
763 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
764 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
768 * New fields can be added to the end of FF_COMMON_FRAME with minor version
770 * Removal, reordering and changes to existing fields require a major
771 * version bump. No fields should be added into AVFrame before or after
773 * sizeof(AVFrame) must not be used outside libav*.
775 typedef struct AVFrame {
779 #define DEFAULT_FRAME_RATE_BASE 1001000
782 * main external API structure.
783 * New fields can be added to the end with minor version bumps.
784 * Removal, reordering and changes to existing fields require a major
786 * sizeof(AVCodecContext) must not be used outside libav*.
788 typedef struct AVCodecContext {
790 * information on struct for av_log
791 * - set by avcodec_alloc_context
795 * the average bitrate
796 * - encoding: Set by user; unused for constant quantizer encoding.
797 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
802 * number of bits the bitstream is allowed to diverge from the reference.
803 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
804 * - encoding: Set by user; unused for constant quantizer encoding.
807 int bit_rate_tolerance;
811 * - encoding: Set by user.
812 * - decoding: Set by user.
817 * Some codecs need additional format info. It is stored here.
818 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
819 * specific codec MUST set it correctly otherwise stream copy breaks.
820 * In general use of this field by muxers is not recommanded.
821 * - encoding: Set by libavcodec.
822 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
827 * Motion estimation algorithm used for video coding.
828 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
829 * 8 (umh), 9 (iter) [7, 8 are x264 specific, 9 is snow specific]
830 * - encoding: MUST be set by user.
836 * some codecs need / can use extradata like Huffman tables.
837 * mjpeg: Huffman tables
838 * rv10: additional flags
839 * mpeg4: global headers (they can be in the bitstream or here)
840 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
841 * than extradata_size to avoid prolems if it is read with the bitstream reader.
842 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
843 * - encoding: Set/allocated/freed by libavcodec.
844 * - decoding: Set/allocated/freed by user.
850 * This is the fundamental unit of time (in seconds) in terms
851 * of which frame timestamps are represented. For fixed-fps content,
852 * timebase should be 1/framerate and timestamp increments should be
854 * - encoding: MUST be set by user.
855 * - decoding: Set by libavcodec.
857 AVRational time_base;
861 * picture width / height.
862 * - encoding: MUST be set by user.
863 * - decoding: Set by libavcodec.
864 * Note: For compatibility it is possible to set this instead of
865 * coded_width/height before decoding.
869 #define FF_ASPECT_EXTENDED 15
872 * the number of pictures in a group of pictures, or 0 for intra_only
873 * - encoding: Set by user.
879 * Pixel format, see PIX_FMT_xxx.
880 * - encoding: Set by user.
881 * - decoding: Set by libavcodec.
883 enum PixelFormat pix_fmt;
886 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
887 * has to read frames at native frame rate.
888 * - encoding: Set by user.
894 * If non NULL, 'draw_horiz_band' is called by the libavcodec
895 * decoder to draw a horizontal band. It improves cache usage. Not
896 * all codecs can do that. You must check the codec capabilities
899 * - decoding: Set by user.
900 * @param height the height of the slice
901 * @param y the y position of the slice
902 * @param type 1->top field, 2->bottom field, 3->frame
903 * @param offset offset into the AVFrame.data from which the slice should be read
905 void (*draw_horiz_band)(struct AVCodecContext *s,
906 const AVFrame *src, int offset[4],
907 int y, int type, int height);
910 int sample_rate; ///< samples per second
914 * audio sample format
915 * - encoding: Set by user.
916 * - decoding: Set by libavcodec.
918 enum SampleFormat sample_fmt; ///< sample format, currently unused
920 /* The following data should not be initialized. */
922 * Samples per packet, initialized when calling 'init'.
925 int frame_number; ///< audio or video frame number
926 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
929 * Number of frames the decoded output will be delayed relative to
931 * - encoding: Set by libavcodec.
936 /* - encoding parameters */
937 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
938 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
942 * - encoding: Set by user.
949 * - encoding: Set by user.
955 * maximum quantizer difference between frames
956 * - encoding: Set by user.
962 * maximum number of B-frames between non-B-frames
963 * Note: The output will be delayed by max_b_frames+1 relative to the input.
964 * - encoding: Set by user.
970 * qscale factor between IP and B-frames
971 * - encoding: Set by user.
974 float b_quant_factor;
976 /** obsolete FIXME remove */
978 #define FF_RC_STRATEGY_XVID 1
980 int b_frame_strategy;
985 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
986 * @deprecated Deprecated in favor of skip_idct and skip_frame.
990 struct AVCodec *codec;
994 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
995 /* unused, FIXME remove*/
999 int rtp_payload_size; /* The size of the RTP payload: the coder will */
1000 /* do its best to deliver a chunk with size */
1001 /* below rtp_payload_size, the chunk will start */
1002 /* with a start code on some codecs like H.263. */
1003 /* This doesn't take account of any particular */
1004 /* headers inside the transmitted RTP payload. */
1007 /* The RTP callback: This function is called */
1008 /* every time the encoder has a packet to send. */
1009 /* It depends on the encoder if the data starts */
1010 /* with a Start Code (it should). H.263 does. */
1011 /* mb_nb contains the number of macroblocks */
1012 /* encoded in the RTP payload. */
1013 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1015 /* statistics, used for 2-pass encoding */
1026 * number of bits used for the previously encoded frame
1027 * - encoding: Set by libavcodec.
1028 * - decoding: unused
1033 * Private data of the user, can be used to carry app specific stuff.
1034 * - encoding: Set by user.
1035 * - decoding: Set by user.
1039 char codec_name[32];
1040 enum CodecType codec_type; /* see CODEC_TYPE_xxx */
1041 enum CodecID codec_id; /* see CODEC_ID_xxx */
1044 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1045 * This is used to work around some encoder bugs.
1046 * A demuxer should set this to what is stored in the field used to identify the codec.
1047 * If there are multiple such fields in a container then the demuxer should choose the one
1048 * which maximizes the information about the used codec.
1049 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1050 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1051 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1053 * - encoding: Set by user, if not then the default based on codec_id will be used.
1054 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1056 unsigned int codec_tag;
1059 * Work around bugs in encoders which sometimes cannot be detected automatically.
1060 * - encoding: Set by user
1061 * - decoding: Set by user
1063 int workaround_bugs;
1064 #define FF_BUG_AUTODETECT 1 ///< autodetection
1065 #define FF_BUG_OLD_MSMPEG4 2
1066 #define FF_BUG_XVID_ILACE 4
1067 #define FF_BUG_UMP4 8
1068 #define FF_BUG_NO_PADDING 16
1069 #define FF_BUG_AMV 32
1070 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1071 #define FF_BUG_QPEL_CHROMA 64
1072 #define FF_BUG_STD_QPEL 128
1073 #define FF_BUG_QPEL_CHROMA2 256
1074 #define FF_BUG_DIRECT_BLOCKSIZE 512
1075 #define FF_BUG_EDGE 1024
1076 #define FF_BUG_HPEL_CHROMA 2048
1077 #define FF_BUG_DC_CLIP 4096
1078 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1079 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1082 * luma single coefficient elimination threshold
1083 * - encoding: Set by user.
1084 * - decoding: unused
1086 int luma_elim_threshold;
1089 * chroma single coeff elimination threshold
1090 * - encoding: Set by user.
1091 * - decoding: unused
1093 int chroma_elim_threshold;
1096 * strictly follow the standard (MPEG4, ...).
1097 * - encoding: Set by user.
1098 * - decoding: unused
1100 int strict_std_compliance;
1101 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1102 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1103 #define FF_COMPLIANCE_NORMAL 0
1104 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1105 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1108 * qscale offset between IP and B-frames
1109 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1110 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1111 * - encoding: Set by user.
1112 * - decoding: unused
1114 float b_quant_offset;
1117 * Error resilience; higher values will detect more errors but may
1118 * misdetect some more or less valid parts as errors.
1119 * - encoding: unused
1120 * - decoding: Set by user.
1122 int error_resilience;
1123 #define FF_ER_CAREFUL 1
1124 #define FF_ER_COMPLIANT 2
1125 #define FF_ER_AGGRESSIVE 3
1126 #define FF_ER_VERY_AGGRESSIVE 4
1129 * Called at the beginning of each frame to get a buffer for it.
1130 * If pic.reference is set then the frame will be read later by libavcodec.
1131 * avcodec_align_dimensions() should be used to find the required width and
1132 * height, as they normally need to be rounded up to the next multiple of 16.
1133 * - encoding: unused
1134 * - decoding: Set by libavcodec., user can override.
1136 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1139 * Called to release buffers which where allocated with get_buffer.
1140 * A released buffer can be reused in get_buffer().
1141 * pic.data[*] must be set to NULL.
1142 * - encoding: unused
1143 * - decoding: Set by libavcodec., user can override.
1145 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1148 * If 1 the stream has a 1 frame delay during decoding.
1149 * - encoding: Set by libavcodec.
1150 * - decoding: Set by libavcodec.
1155 * number of bytes per packet if constant and known or 0
1156 * Used by some WAV based audio codecs.
1160 int parse_only; /* - decoding only: If true, only parsing is done
1161 (function avcodec_parse_frame()). The frame
1162 data is returned. Only MPEG codecs support this now. */
1165 * 0-> h263 quant 1-> mpeg quant
1166 * - encoding: Set by user.
1167 * - decoding: unused
1172 * pass1 encoding statistics output buffer
1173 * - encoding: Set by libavcodec.
1174 * - decoding: unused
1179 * pass2 encoding statistics input buffer
1180 * Concatenated stuff from stats_out of pass1 should be placed here.
1181 * - encoding: Allocated/set/freed by user.
1182 * - decoding: unused
1187 * ratecontrol qmin qmax limiting method
1188 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1189 * - encoding: Set by user.
1190 * - decoding: unused
1198 * ratecontrol override, see RcOverride
1199 * - encoding: Allocated/set/freed by user.
1200 * - decoding: unused
1202 RcOverride *rc_override;
1203 int rc_override_count;
1206 * rate control equation
1207 * - encoding: Set by user
1208 * - decoding: unused
1214 * - encoding: Set by user.
1215 * - decoding: unused
1221 * - encoding: Set by user.
1222 * - decoding: unused
1227 * decoder bitstream buffer size
1228 * - encoding: Set by user.
1229 * - decoding: unused
1232 float rc_buffer_aggressivity;
1235 * qscale factor between P and I-frames
1236 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1237 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1238 * - encoding: Set by user.
1239 * - decoding: unused
1241 float i_quant_factor;
1244 * qscale offset between P and I-frames
1245 * - encoding: Set by user.
1246 * - decoding: unused
1248 float i_quant_offset;
1251 * initial complexity for pass1 ratecontrol
1252 * - encoding: Set by user.
1253 * - decoding: unused
1255 float rc_initial_cplx;
1258 * DCT algorithm, see FF_DCT_* below
1259 * - encoding: Set by user.
1260 * - decoding: unused
1263 #define FF_DCT_AUTO 0
1264 #define FF_DCT_FASTINT 1
1265 #define FF_DCT_INT 2
1266 #define FF_DCT_MMX 3
1267 #define FF_DCT_MLIB 4
1268 #define FF_DCT_ALTIVEC 5
1269 #define FF_DCT_FAAN 6
1272 * luminance masking (0-> disabled)
1273 * - encoding: Set by user.
1274 * - decoding: unused
1279 * temporary complexity masking (0-> disabled)
1280 * - encoding: Set by user.
1281 * - decoding: unused
1283 float temporal_cplx_masking;
1286 * spatial complexity masking (0-> disabled)
1287 * - encoding: Set by user.
1288 * - decoding: unused
1290 float spatial_cplx_masking;
1293 * p block masking (0-> disabled)
1294 * - encoding: Set by user.
1295 * - decoding: unused
1300 * darkness masking (0-> disabled)
1301 * - encoding: Set by user.
1302 * - decoding: unused
1307 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
1308 /* for binary compatibility */
1313 * IDCT algorithm, see FF_IDCT_* below.
1314 * - encoding: Set by user.
1315 * - decoding: Set by user.
1318 #define FF_IDCT_AUTO 0
1319 #define FF_IDCT_INT 1
1320 #define FF_IDCT_SIMPLE 2
1321 #define FF_IDCT_SIMPLEMMX 3
1322 #define FF_IDCT_LIBMPEG2MMX 4
1323 #define FF_IDCT_PS2 5
1324 #define FF_IDCT_MLIB 6
1325 #define FF_IDCT_ARM 7
1326 #define FF_IDCT_ALTIVEC 8
1327 #define FF_IDCT_SH4 9
1328 #define FF_IDCT_SIMPLEARM 10
1329 #define FF_IDCT_H264 11
1330 #define FF_IDCT_VP3 12
1331 #define FF_IDCT_IPP 13
1332 #define FF_IDCT_XVIDMMX 14
1333 #define FF_IDCT_CAVS 15
1334 #define FF_IDCT_SIMPLEARMV5TE 16
1335 #define FF_IDCT_SIMPLEARMV6 17
1336 #define FF_IDCT_SIMPLEVIS 18
1337 #define FF_IDCT_WMV2 19
1338 #define FF_IDCT_FAAN 20
1342 * - encoding: Set by libavcodec.
1343 * - decoding: Set by user (or 0).
1347 * slice offsets in the frame in bytes
1348 * - encoding: Set/allocated by libavcodec.
1349 * - decoding: Set/allocated by user (or NULL).
1354 * error concealment flags
1355 * - encoding: unused
1356 * - decoding: Set by user.
1358 int error_concealment;
1359 #define FF_EC_GUESS_MVS 1
1360 #define FF_EC_DEBLOCK 2
1363 * dsp_mask could be add used to disable unwanted CPU features
1364 * CPU features (i.e. MMX, SSE. ...)
1366 * With the FORCE flag you may instead enable given CPU features.
1367 * (Dangerous: Usable in case of misdetection, improper usage however will
1368 * result into program crash.)
1371 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1372 /* lower 16 bits - CPU features */
1373 #define FF_MM_MMX 0x0001 ///< standard MMX
1374 #define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
1375 #define FF_MM_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
1376 #define FF_MM_SSE 0x0008 ///< SSE functions
1377 #define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
1378 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1379 #define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
1380 #define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
1381 #define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
1384 * bits per sample/pixel from the demuxer (needed for huffyuv).
1385 * - encoding: Set by libavcodec.
1386 * - decoding: Set by user.
1388 int bits_per_sample;
1391 * prediction method (needed for huffyuv)
1392 * - encoding: Set by user.
1393 * - decoding: unused
1395 int prediction_method;
1396 #define FF_PRED_LEFT 0
1397 #define FF_PRED_PLANE 1
1398 #define FF_PRED_MEDIAN 2
1401 * sample aspect ratio (0 if unknown)
1402 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1403 * - encoding: Set by user.
1404 * - decoding: Set by libavcodec.
1406 AVRational sample_aspect_ratio;
1409 * the picture in the bitstream
1410 * - encoding: Set by libavcodec.
1411 * - decoding: Set by libavcodec.
1413 AVFrame *coded_frame;
1417 * - encoding: Set by user.
1418 * - decoding: Set by user.
1421 #define FF_DEBUG_PICT_INFO 1
1422 #define FF_DEBUG_RC 2
1423 #define FF_DEBUG_BITSTREAM 4
1424 #define FF_DEBUG_MB_TYPE 8
1425 #define FF_DEBUG_QP 16
1426 #define FF_DEBUG_MV 32
1427 #define FF_DEBUG_DCT_COEFF 0x00000040
1428 #define FF_DEBUG_SKIP 0x00000080
1429 #define FF_DEBUG_STARTCODE 0x00000100
1430 #define FF_DEBUG_PTS 0x00000200
1431 #define FF_DEBUG_ER 0x00000400
1432 #define FF_DEBUG_MMCO 0x00000800
1433 #define FF_DEBUG_BUGS 0x00001000
1434 #define FF_DEBUG_VIS_QP 0x00002000
1435 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1439 * - encoding: Set by user.
1440 * - decoding: Set by user.
1443 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1444 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1445 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1449 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1450 * - decoding: unused
1455 * minimum MB quantizer
1456 * - encoding: unused
1457 * - decoding: unused
1462 * maximum MB quantizer
1463 * - encoding: unused
1464 * - decoding: unused
1469 * motion estimation comparison function
1470 * - encoding: Set by user.
1471 * - decoding: unused
1475 * subpixel motion estimation comparison function
1476 * - encoding: Set by user.
1477 * - decoding: unused
1481 * macroblock comparison function (not supported yet)
1482 * - encoding: Set by user.
1483 * - decoding: unused
1487 * interlaced DCT comparison function
1488 * - encoding: Set by user.
1489 * - decoding: unused
1492 #define FF_CMP_SAD 0
1493 #define FF_CMP_SSE 1
1494 #define FF_CMP_SATD 2
1495 #define FF_CMP_DCT 3
1496 #define FF_CMP_PSNR 4
1497 #define FF_CMP_BIT 5
1499 #define FF_CMP_ZERO 7
1500 #define FF_CMP_VSAD 8
1501 #define FF_CMP_VSSE 9
1502 #define FF_CMP_NSSE 10
1503 #define FF_CMP_W53 11
1504 #define FF_CMP_W97 12
1505 #define FF_CMP_DCTMAX 13
1506 #define FF_CMP_DCT264 14
1507 #define FF_CMP_CHROMA 256
1510 * ME diamond size & shape
1511 * - encoding: Set by user.
1512 * - decoding: unused
1517 * amount of previous MV predictors (2a+1 x 2a+1 square)
1518 * - encoding: Set by user.
1519 * - decoding: unused
1521 int last_predictor_count;
1524 * prepass for motion estimation
1525 * - encoding: Set by user.
1526 * - decoding: unused
1531 * motion estimation prepass comparison function
1532 * - encoding: Set by user.
1533 * - decoding: unused
1538 * ME prepass diamond size & shape
1539 * - encoding: Set by user.
1540 * - decoding: unused
1546 * - encoding: Set by user.
1547 * - decoding: unused
1549 int me_subpel_quality;
1552 * callback to negotiate the pixelFormat
1553 * @param fmt is the list of formats which are supported by the codec,
1554 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1555 * The first is always the native one.
1556 * @return the chosen format
1557 * - encoding: unused
1558 * - decoding: Set by user, if not set the native format will be chosen.
1560 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1563 * DTG active format information (additional aspect ratio
1564 * information only used in DVB MPEG-2 transport streams)
1567 * - encoding: unused
1568 * - decoding: Set by decoder.
1570 int dtg_active_format;
1571 #define FF_DTG_AFD_SAME 8
1572 #define FF_DTG_AFD_4_3 9
1573 #define FF_DTG_AFD_16_9 10
1574 #define FF_DTG_AFD_14_9 11
1575 #define FF_DTG_AFD_4_3_SP_14_9 13
1576 #define FF_DTG_AFD_16_9_SP_14_9 14
1577 #define FF_DTG_AFD_SP_4_3 15
1580 * maximum motion estimation search range in subpel units
1581 * If 0 then no limit.
1583 * - encoding: Set by user.
1584 * - decoding: unused
1589 * intra quantizer bias
1590 * - encoding: Set by user.
1591 * - decoding: unused
1593 int intra_quant_bias;
1594 #define FF_DEFAULT_QUANT_BIAS 999999
1597 * inter quantizer bias
1598 * - encoding: Set by user.
1599 * - decoding: unused
1601 int inter_quant_bias;
1605 * - encoding: unused
1606 * - decoding: Which clrtable should be used for 8bit RGB images.
1607 * Tables have to be stored somewhere. FIXME
1612 * internal_buffer count
1613 * Don't touch, used by libavcodec default_get_buffer().
1615 int internal_buffer_count;
1619 * Don't touch, used by libavcodec default_get_buffer().
1621 void *internal_buffer;
1623 #define FF_LAMBDA_SHIFT 7
1624 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1625 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1626 #define FF_LAMBDA_MAX (256*128-1)
1628 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1630 * Global quality for codecs which cannot change it per frame.
1631 * This should be proportional to MPEG-1/2/4 qscale.
1632 * - encoding: Set by user.
1633 * - decoding: unused
1637 #define FF_CODER_TYPE_VLC 0
1638 #define FF_CODER_TYPE_AC 1
1639 #define FF_CODER_TYPE_RAW 2
1640 #define FF_CODER_TYPE_RLE 3
1641 #define FF_CODER_TYPE_DEFLATE 4
1644 * - encoding: Set by user.
1645 * - decoding: unused
1651 * - encoding: Set by user.
1652 * - decoding: unused
1658 * - encoding: unused
1659 * - decoding: Set by user.
1661 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1666 * - encoding: unused
1667 * - decoding: Set by user.
1670 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1671 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1672 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1675 * XVideo Motion Acceleration
1676 * - encoding: forbidden
1677 * - decoding: set by decoder
1679 int xvmc_acceleration;
1682 * macroblock decision mode
1683 * - encoding: Set by user.
1684 * - decoding: unused
1687 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1688 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1689 #define FF_MB_DECISION_RD 2 ///< rate distoration
1692 * custom intra quantization matrix
1693 * - encoding: Set by user, can be NULL.
1694 * - decoding: Set by libavcodec.
1696 uint16_t *intra_matrix;
1699 * custom inter quantization matrix
1700 * - encoding: Set by user, can be NULL.
1701 * - decoding: Set by libavcodec.
1703 uint16_t *inter_matrix;
1706 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1707 * This is used to work around some encoder bugs.
1708 * - encoding: unused
1709 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1711 unsigned int stream_codec_tag;
1714 * scene change detection threshold
1715 * 0 is default, larger means fewer detected scene changes.
1716 * - encoding: Set by user.
1717 * - decoding: unused
1719 int scenechange_threshold;
1722 * minimum Lagrange multipler
1723 * - encoding: Set by user.
1724 * - decoding: unused
1729 * maximum Lagrange multipler
1730 * - encoding: Set by user.
1731 * - decoding: unused
1736 * palette control structure
1737 * - encoding: ??? (no palette-enabled encoder yet)
1738 * - decoding: Set by user.
1740 struct AVPaletteControl *palctrl;
1743 * noise reduction strength
1744 * - encoding: Set by user.
1745 * - decoding: unused
1747 int noise_reduction;
1750 * Called at the beginning of a frame to get cr buffer for it.
1751 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1752 * libavcodec will pass previous buffer in pic, function should return
1753 * same buffer or new buffer with old frame "painted" into it.
1754 * If pic.data[0] == NULL must behave like get_buffer().
1755 * - encoding: unused
1756 * - decoding: Set by libavcodec., user can override
1758 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1761 * Number of bits which should be loaded into the rc buffer before decoding starts.
1762 * - encoding: Set by user.
1763 * - decoding: unused
1765 int rc_initial_buffer_occupancy;
1769 * - encoding: Set by user.
1770 * - decoding: unused
1772 int inter_threshold;
1776 * - encoding: Set by user.
1777 * - decoding: Set by user.
1782 * Simulates errors in the bitstream to test error concealment.
1783 * - encoding: Set by user.
1784 * - decoding: unused
1789 * MP3 antialias algorithm, see FF_AA_* below.
1790 * - encoding: unused
1791 * - decoding: Set by user.
1794 #define FF_AA_AUTO 0
1795 #define FF_AA_FASTINT 1 //not implemented yet
1797 #define FF_AA_FLOAT 3
1799 * quantizer noise shaping
1800 * - encoding: Set by user.
1801 * - decoding: unused
1803 int quantizer_noise_shaping;
1807 * is used to decide how many independent tasks should be passed to execute()
1808 * - encoding: Set by user.
1809 * - decoding: Set by user.
1814 * The codec may call this to execute several independent things.
1815 * It will return only after finishing all tasks.
1816 * The user may replace this with some multithreaded implementation,
1817 * the default implementation will execute the parts serially.
1818 * @param count the number of things to execute
1819 * - encoding: Set by libavcodec, user can override.
1820 * - decoding: Set by libavcodec, user can override.
1822 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void **arg2, int *ret, int count);
1826 * Can be used by execute() to store some per AVCodecContext stuff.
1827 * - encoding: set by execute()
1828 * - decoding: set by execute()
1830 void *thread_opaque;
1833 * Motion estimation threshold below which no motion estimation is
1834 * performed, but instead the user specified motion vectors are used.
1836 * - encoding: Set by user.
1837 * - decoding: unused
1842 * Macroblock threshold below which the user specified macroblock types will be used.
1843 * - encoding: Set by user.
1844 * - decoding: unused
1849 * precision of the intra DC coefficient - 8
1850 * - encoding: Set by user.
1851 * - decoding: unused
1853 int intra_dc_precision;
1856 * noise vs. sse weight for the nsse comparsion function
1857 * - encoding: Set by user.
1858 * - decoding: unused
1863 * Number of macroblock rows at the top which are skipped.
1864 * - encoding: unused
1865 * - decoding: Set by user.
1870 * Number of macroblock rows at the bottom which are skipped.
1871 * - encoding: unused
1872 * - decoding: Set by user.
1878 * - encoding: Set by user.
1879 * - decoding: Set by libavcodec.
1882 #define FF_PROFILE_UNKNOWN -99
1883 #define FF_PROFILE_AAC_MAIN 0
1884 #define FF_PROFILE_AAC_LOW 1
1885 #define FF_PROFILE_AAC_SSR 2
1886 #define FF_PROFILE_AAC_LTP 3
1890 * - encoding: Set by user.
1891 * - decoding: Set by libavcodec.
1894 #define FF_LEVEL_UNKNOWN -99
1897 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1898 * - encoding: unused
1899 * - decoding: Set by user.
1904 * Bitstream width / height, may be different from width/height if lowres
1905 * or other things are used.
1906 * - encoding: unused
1907 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1909 int coded_width, coded_height;
1912 * frame skip threshold
1913 * - encoding: Set by user.
1914 * - decoding: unused
1916 int frame_skip_threshold;
1920 * - encoding: Set by user.
1921 * - decoding: unused
1923 int frame_skip_factor;
1926 * frame skip exponent
1927 * - encoding: Set by user.
1928 * - decoding: unused
1933 * frame skip comparison function
1934 * - encoding: Set by user.
1935 * - decoding: unused
1940 * Border processing masking, raises the quantizer for mbs on the borders
1942 * - encoding: Set by user.
1943 * - decoding: unused
1945 float border_masking;
1948 * minimum MB lagrange multipler
1949 * - encoding: Set by user.
1950 * - decoding: unused
1955 * maximum MB lagrange multipler
1956 * - encoding: Set by user.
1957 * - decoding: unused
1963 * - encoding: Set by user.
1964 * - decoding: unused
1966 int me_penalty_compensation;
1970 * - encoding: unused
1971 * - decoding: Set by user.
1973 enum AVDiscard skip_loop_filter;
1977 * - encoding: unused
1978 * - decoding: Set by user.
1980 enum AVDiscard skip_idct;
1984 * - encoding: unused
1985 * - decoding: Set by user.
1987 enum AVDiscard skip_frame;
1991 * - encoding: Set by user.
1992 * - decoding: unused
1998 * - encoding: Set by user.
1999 * - decoding: unused
2004 * constant rate factor - quality-based VBR - values ~correspond to qps
2005 * - encoding: Set by user.
2006 * - decoding: unused
2011 * constant quantization parameter rate control method
2012 * - encoding: Set by user.
2013 * - decoding: unused
2019 * - encoding: Set by user.
2020 * - decoding: unused
2025 * number of reference frames
2026 * - encoding: Set by user.
2027 * - decoding: unused
2032 * chroma qp offset from luma
2033 * - encoding: Set by user.
2034 * - decoding: unused
2039 * Influences how often B-frames are used.
2040 * - encoding: Set by user.
2041 * - decoding: unused
2046 * trellis RD quantization
2047 * - encoding: Set by user.
2048 * - decoding: unused
2053 * Reduce fluctuations in qp (before curve compression).
2054 * - encoding: Set by user.
2055 * - decoding: unused
2057 float complexityblur;
2060 * in-loop deblocking filter alphac0 parameter
2061 * alpha is in the range -6...6
2062 * - encoding: Set by user.
2063 * - decoding: unused
2068 * in-loop deblocking filter beta parameter
2069 * beta is in the range -6...6
2070 * - encoding: Set by user.
2071 * - decoding: unused
2076 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2077 * - encoding: Set by user.
2078 * - decoding: unused
2081 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2082 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2083 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2084 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2085 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2088 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal)
2089 * - encoding: Set by user.
2090 * - decoding: unused
2095 * Audio cutoff bandwidth (0 means "automatic")
2096 * - encoding: Set by user.
2097 * - decoding: unused
2102 * Multiplied by qscale for each frame and added to scene_change_score.
2103 * - encoding: Set by user.
2104 * - decoding: unused
2106 int scenechange_factor;
2110 * Note: Value depends upon the compare function used for fullpel ME.
2111 * - encoding: Set by user.
2112 * - decoding: unused
2117 * Adjusts sensitivity of b_frame_strategy 1.
2118 * - encoding: Set by user.
2119 * - decoding: unused
2124 * - encoding: Set by user.
2125 * - decoding: unused
2127 int compression_level;
2128 #define FF_COMPRESSION_DEFAULT -1
2131 * Sets whether to use LPC mode - used by FLAC encoder.
2132 * - encoding: Set by user.
2133 * - decoding: unused
2138 * LPC coefficient precision - used by FLAC encoder
2139 * - encoding: Set by user.
2140 * - decoding: unused
2142 int lpc_coeff_precision;
2145 * - encoding: Set by user.
2146 * - decoding: unused
2148 int min_prediction_order;
2151 * - encoding: Set by user.
2152 * - decoding: unused
2154 int max_prediction_order;
2157 * search method for selecting prediction order
2158 * - encoding: Set by user.
2159 * - decoding: unused
2161 int prediction_order_method;
2164 * - encoding: Set by user.
2165 * - decoding: unused
2167 int min_partition_order;
2170 * - encoding: Set by user.
2171 * - decoding: unused
2173 int max_partition_order;
2176 * GOP timecode frame start number, in non drop frame format
2177 * - encoding: Set by user.
2178 * - decoding: unused
2180 int64_t timecode_frame_start;
2183 * Decoder should decode to this many channels if it can (0 for default)
2184 * - encoding: unused
2185 * - decoding: Set by user.
2187 int request_channels;
2190 * Percentage of dynamic range compression to be applied by the decoder.
2191 * The default value is 1.0, corresponding to full compression.
2192 * - encoding: unused
2193 * - decoding: Set by user.
2201 typedef struct AVCodec {
2203 * Name of the codec implementation.
2204 * The name is globally unique among encoders and among decoders (but an
2205 * encoder and a decoder can share the same name).
2206 * This is the primary way to find a codec from the user perspective.
2209 enum CodecType type;
2212 int (*init)(AVCodecContext *);
2213 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2214 int (*close)(AVCodecContext *);
2215 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size,
2216 const uint8_t *buf, int buf_size);
2218 struct AVCodec *next;
2219 void (*flush)(AVCodecContext *);
2220 const AVRational *supported_framerates; ///array of supported framerates, or NULL if any, array is terminated by {0,0}
2221 const enum PixelFormat *pix_fmts; ///array of supported pixel formats, or NULL if unknown, array is terminanted by -1
2225 * four components are given, that's all.
2226 * the last component is alpha
2228 typedef struct AVPicture {
2230 int linesize[4]; ///< number of bytes per line
2235 * This structure defines a method for communicating palette changes
2236 * between and demuxer and a decoder.
2238 * @deprecated Use AVPacket to send palette changes instead.
2239 * This is totally broken.
2241 #define AVPALETTE_SIZE 1024
2242 #define AVPALETTE_COUNT 256
2243 typedef struct AVPaletteControl {
2245 /* Demuxer sets this to 1 to indicate the palette has changed;
2246 * decoder resets to 0. */
2247 int palette_changed;
2249 /* 4-byte ARGB palette entries, stored in native byte order; note that
2250 * the individual palette components should be on a 8-bit scale; if
2251 * the palette data comes from an IBM VGA native format, the component
2252 * data is probably 6 bits in size and needs to be scaled. */
2253 unsigned int palette[AVPALETTE_COUNT];
2255 } AVPaletteControl attribute_deprecated;
2257 typedef struct AVSubtitleRect {
2264 uint32_t *rgba_palette;
2268 typedef struct AVSubtitle {
2269 uint16_t format; /* 0 = graphics */
2270 uint32_t start_display_time; /* relative to packet pts, in ms */
2271 uint32_t end_display_time; /* relative to packet pts, in ms */
2273 AVSubtitleRect *rects;
2279 struct ReSampleContext;
2280 struct AVResampleContext;
2282 typedef struct ReSampleContext ReSampleContext;
2284 ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2285 int output_rate, int input_rate);
2286 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2287 void audio_resample_close(ReSampleContext *s);
2289 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2290 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2291 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2292 void av_resample_close(struct AVResampleContext *c);
2294 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2295 /* YUV420 format is assumed ! */
2298 * @deprecated Use the software scaler (swscale) instead.
2300 typedef struct ImgReSampleContext ImgReSampleContext attribute_deprecated;
2303 * @deprecated Use the software scaler (swscale) instead.
2305 attribute_deprecated ImgReSampleContext *img_resample_init(int output_width, int output_height,
2306 int input_width, int input_height);
2309 * @deprecated Use the software scaler (swscale) instead.
2311 attribute_deprecated ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
2312 int iwidth, int iheight,
2313 int topBand, int bottomBand,
2314 int leftBand, int rightBand,
2315 int padtop, int padbottom,
2316 int padleft, int padright);
2319 * @deprecated Use the software scaler (swscale) instead.
2321 attribute_deprecated void img_resample(struct ImgReSampleContext *s,
2322 AVPicture *output, const AVPicture *input);
2325 * @deprecated Use the software scaler (swscale) instead.
2327 attribute_deprecated void img_resample_close(struct ImgReSampleContext *s);
2332 * Allocate memory for a picture. Call avpicture_free to free it.
2334 * @param picture the picture to be filled in
2335 * @param pix_fmt the format of the picture
2336 * @param width the width of the picture
2337 * @param height the height of the picture
2338 * @return zero if successful, a negative value if not
2340 int avpicture_alloc(AVPicture *picture, int pix_fmt, int width, int height);
2343 * Free a picture previously allocated by avpicture_alloc().
2345 * @param picture the AVPicture to be freed
2347 void avpicture_free(AVPicture *picture);
2350 * Fill in the AVPicture fields.
2351 * The fields of the given AVPicture are filled in by using the 'ptr' address
2352 * which points to the image data buffer. Depending on the specified picture
2353 * format, one or multiple image data pointers and line sizes will be set.
2354 * If a planar format is specified, several pointers will be set pointing to
2355 * the different picture planes and the line sizes of the different planes
2356 * will be stored in the lines_sizes array.
2358 * @param picture AVPicture whose fields are to be filled in
2359 * @param ptr Buffer which will contain or contains the actual image data
2360 * @param pix_fmt The format in which the picture data is stored.
2361 * @param width the width of the image in pixels
2362 * @param height the height of the image in pixels
2363 * @return size of the image data in bytes
2365 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2366 int pix_fmt, int width, int height);
2367 int avpicture_layout(const AVPicture* src, int pix_fmt, int width, int height,
2368 unsigned char *dest, int dest_size);
2371 * Calculate the size in bytes that a picture of the given width and height
2372 * would occupy if stored in the given picture format.
2374 * @param pix_fmt the given picture format
2375 * @param width the width of the image
2376 * @param height the height of the image
2377 * @return Image data size in bytes
2379 int avpicture_get_size(int pix_fmt, int width, int height);
2380 void avcodec_get_chroma_sub_sample(int pix_fmt, int *h_shift, int *v_shift);
2381 const char *avcodec_get_pix_fmt_name(int pix_fmt);
2382 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2383 enum PixelFormat avcodec_get_pix_fmt(const char* name);
2384 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);
2386 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
2387 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
2388 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
2389 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
2390 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
2391 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
2394 * Computes what kind of losses will occur when converting from one specific
2395 * pixel format to another.
2396 * When converting from one pixel format to another, information loss may occur.
2397 * For example, when converting from RGB24 to GRAY, the color information will
2398 * be lost. Similarly, other losses occur when converting from some formats to
2399 * other formats. These losses can involve loss of chroma, but also loss of
2400 * resolution, loss of color depth, loss due to the color space conversion, loss
2401 * of the alpha bits or loss due to color quantization.
2402 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
2403 * which will occur when converting from one pixel format to another.
2405 * @param[in] dst_pix_fmt destination pixel format
2406 * @param[in] src_pix_fmt source pixel format
2407 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2408 * @return Combination of flags informing you what kind of losses will occur.
2410 int avcodec_get_pix_fmt_loss(int dst_pix_fmt, int src_pix_fmt,
2414 * Finds the best pixel format to convert to given a certain source pixel
2415 * format. When converting from one pixel format to another, information loss
2416 * may occur. For example, when converting from RGB24 to GRAY, the color
2417 * information will be lost. Similarly, other losses occur when converting from
2418 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
2419 * the given pixel formats should be used to suffer the least amount of loss.
2420 * The pixel formats from which it chooses one, are determined by the
2421 * \p pix_fmt_mask parameter.
2424 * src_pix_fmt = PIX_FMT_YUV420P;
2425 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
2426 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
2429 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
2430 * @param[in] src_pix_fmt source pixel format
2431 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2432 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
2433 * @return The best pixel format to convert to or -1 if none was found.
2435 int avcodec_find_best_pix_fmt(int pix_fmt_mask, int src_pix_fmt,
2436 int has_alpha, int *loss_ptr);
2440 * Print in buf the string corresponding to the pixel format with
2441 * number pix_fmt, or an header if pix_fmt is negative.
2443 * @param[in] buf the buffer where to write the string
2444 * @param[in] buf_size the size of buf
2445 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
2446 * a negative value to print the corresponding header.
2447 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
2449 void avcodec_pix_fmt_string (char *buf, int buf_size, int pix_fmt);
2451 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
2452 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
2455 * Tell if an image really has transparent alpha values.
2456 * @return ored mask of FF_ALPHA_xxx constants
2458 int img_get_alpha_info(const AVPicture *src,
2459 int pix_fmt, int width, int height);
2461 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2463 * convert among pixel formats
2464 * @deprecated Use the software scaler (swscale) instead.
2466 attribute_deprecated int img_convert(AVPicture *dst, int dst_pix_fmt,
2467 const AVPicture *src, int pix_fmt,
2468 int width, int height);
2471 /* deinterlace a picture */
2472 /* deinterlace - if not supported return -1 */
2473 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
2474 int pix_fmt, int width, int height);
2476 /* external high level API */
2478 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2479 extern AVCodec *first_avcodec;
2481 AVCodec *av_codec_next(AVCodec *c);
2483 /* returns LIBAVCODEC_VERSION_INT constant */
2484 unsigned avcodec_version(void);
2485 /* returns LIBAVCODEC_BUILD constant */
2486 unsigned avcodec_build(void);
2489 * Initializes libavcodec.
2491 * @warning This function \e must be called before any other libavcodec
2494 void avcodec_init(void);
2496 void register_avcodec(AVCodec *format);
2499 * Finds a registered encoder with a matching codec ID.
2501 * @param id CodecID of the requested encoder
2502 * @return An encoder if one was found, NULL otherwise.
2504 AVCodec *avcodec_find_encoder(enum CodecID id);
2507 * Finds a registered encoder with the specified name.
2509 * @param name name of the requested encoder
2510 * @return An encoder if one was found, NULL otherwise.
2512 AVCodec *avcodec_find_encoder_by_name(const char *name);
2515 * Finds a registered decoder with a matching codec ID.
2517 * @param id CodecID of the requested decoder
2518 * @return A decoder if one was found, NULL otherwise.
2520 AVCodec *avcodec_find_decoder(enum CodecID id);
2523 * Finds a registered decoder with the specified name.
2525 * @param name name of the requested decoder
2526 * @return A decoder if one was found, NULL otherwise.
2528 AVCodec *avcodec_find_decoder_by_name(const char *name);
2529 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
2532 * Sets the fields of the given AVCodecContext to default values.
2534 * @param s The AVCodecContext of which the fields should be set to default values.
2536 void avcodec_get_context_defaults(AVCodecContext *s);
2538 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2539 * we WILL change its arguments and name a few times! */
2540 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
2543 * Allocates an AVCodecContext and sets its fields to default values. The
2544 * resulting struct can be deallocated by simply calling av_free().
2546 * @return An AVCodecContext filled with default values or NULL on failure.
2547 * @see avcodec_get_context_defaults
2549 AVCodecContext *avcodec_alloc_context(void);
2551 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2552 * we WILL change its arguments and name a few times! */
2553 AVCodecContext *avcodec_alloc_context2(enum CodecType);
2556 * Sets the fields of the given AVFrame to default values.
2558 * @param pic The AVFrame of which the fields should be set to default values.
2560 void avcodec_get_frame_defaults(AVFrame *pic);
2563 * Allocates an AVFrame and sets its fields to default values. The resulting
2564 * struct can be deallocated by simply calling av_free().
2566 * @return An AVFrame filled with default values or NULL on failure.
2567 * @see avcodec_get_frame_defaults
2569 AVFrame *avcodec_alloc_frame(void);
2571 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
2572 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
2573 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
2574 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
2577 * Checks if the given dimension of a picture is valid, meaning that all
2578 * bytes of the picture can be addressed with a signed int.
2580 * @param[in] w Width of the picture.
2581 * @param[in] h Height of the picture.
2582 * @return Zero if valid, a negative value if invalid.
2584 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
2585 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
2587 int avcodec_thread_init(AVCodecContext *s, int thread_count);
2588 void avcodec_thread_free(AVCodecContext *s);
2589 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2590 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2591 //FIXME func typedef
2594 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
2595 * function the context has to be allocated.
2597 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2598 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2599 * retrieving a codec.
2601 * @warning This function is not thread safe!
2604 * avcodec_register_all();
2605 * codec = avcodec_find_decoder(CODEC_ID_H264);
2609 * context = avcodec_alloc_context();
2611 * if (avcodec_open(context, codec) < 0)
2615 * @param avctx The context which will be set up to use the given codec.
2616 * @param codec The codec to use within the context.
2617 * @return zero on success, a negative value on error
2618 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
2620 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
2623 * @deprecated Use avcodec_decode_audio2() instead.
2625 attribute_deprecated int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
2626 int *frame_size_ptr,
2627 const uint8_t *buf, int buf_size);
2630 * Decodes an audio frame from \p buf into \p samples.
2631 * The avcodec_decode_audio2() function decodes an audio frame from the input
2632 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2633 * audio codec which was coupled with \p avctx using avcodec_open(). The
2634 * resulting decoded frame is stored in output buffer \p samples. If no frame
2635 * could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
2636 * decompressed frame size in \e bytes.
2638 * @warning You \e must set \p frame_size_ptr to the allocated size of the
2639 * output buffer before calling avcodec_decode_audio2().
2641 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2642 * the actual read bytes because some optimized bitstream readers read 32 or 64
2643 * bits at once and could read over the end.
2645 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2646 * no overreading happens for damaged MPEG streams.
2648 * @note You might have to align the input buffer \p buf and output buffer \p
2649 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
2650 * necessary at all, on others it won't work at all if not aligned and on others
2651 * it will work but it will have an impact on performance. In practice, the
2652 * bitstream should have 4 byte alignment at minimum and all sample data should
2653 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2654 * the linesize is not a multiple of 16 then there's no sense in aligning the
2655 * start of the buffer to 16.
2657 * @param avctx the codec context
2658 * @param[out] samples the output buffer
2659 * @param[in,out] frame_size_ptr the output buffer size in bytes
2660 * @param[in] buf the input buffer
2661 * @param[in] buf_size the input buffer size in bytes
2662 * @return On error a negative value is returned, otherwise the number of bytes
2663 * used or zero if no frame could be decompressed.
2665 int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
2666 int *frame_size_ptr,
2667 const uint8_t *buf, int buf_size);
2670 * Decodes a video frame from \p buf into \p picture.
2671 * The avcodec_decode_video() function decodes a video frame from the input
2672 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2673 * video codec which was coupled with \p avctx using avcodec_open(). The
2674 * resulting decoded frame is stored in \p picture.
2676 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2677 * the actual read bytes because some optimized bitstream readers read 32 or 64
2678 * bits at once and could read over the end.
2680 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2681 * no overreading happens for damaged MPEG streams.
2683 * @note You might have to align the input buffer \p buf and output buffer \p
2684 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
2685 * necessary at all, on others it won't work at all if not aligned and on others
2686 * it will work but it will have an impact on performance. In practice, the
2687 * bitstream should have 4 byte alignment at minimum and all sample data should
2688 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2689 * the linesize is not a multiple of 16 then there's no sense in aligning the
2690 * start of the buffer to 16.
2692 * @param avctx the codec context
2693 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
2694 * @param[in] buf the input buffer
2695 * @param[in] buf_size the size of the input buffer in bytes
2696 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
2697 * @return On error a negative value is returned, otherwise the number of bytes
2698 * used or zero if no frame could be decompressed.
2700 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
2701 int *got_picture_ptr,
2702 const uint8_t *buf, int buf_size);
2704 /* Decode a subtitle message. Return -1 if error, otherwise return the
2705 * number of bytes used. If no subtitle could be decompressed,
2706 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
2707 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
2709 const uint8_t *buf, int buf_size);
2710 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
2712 uint8_t *buf, int buf_size);
2715 * Encodes an audio frame from \p samples into \p buf.
2716 * The avcodec_encode_audio() function encodes an audio frame from the input
2717 * buffer \p samples. To encode it, it makes use of the audio codec which was
2718 * coupled with \p avctx using avcodec_open(). The resulting encoded frame is
2719 * stored in output buffer \p buf.
2721 * @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
2723 * @param avctx the codec context
2724 * @param[out] buf the output buffer
2725 * @param[in] buf_size the output buffer size
2726 * @param[in] samples the input buffer containing the samples
2727 * The number of samples read from this buffer is frame_size*channels,
2728 * both of which are defined in \p avctx.
2729 * @return On error a negative value is returned, on success zero or the number
2730 * of bytes used to encode the data read from the input buffer.
2732 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2733 const short *samples);
2736 * Encodes a video frame from \p pict into \p buf.
2737 * The avcodec_encode_video() function encodes a video frame from the input
2738 * \p pict. To encode it, it makes use of the video codec which was coupled with
2739 * \p avctx using avcodec_open(). The resulting encoded bytes representing the
2740 * frame are stored in the output buffer \p buf. The input picture should be
2741 * stored using a specific format, namely \c avctx.pix_fmt.
2743 * @param avctx the codec context
2744 * @param[out] buf the output buffer for the bitstream of encoded frame
2745 * @param[in] buf_size the size of the output buffer in bytes
2746 * @param[in] pict the input picture to encode
2747 * @return On error a negative value is returned, on success zero or the number
2748 * of bytes used from the input buffer.
2750 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2751 const AVFrame *pict);
2752 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2753 const AVSubtitle *sub);
2755 int avcodec_close(AVCodecContext *avctx);
2757 void avcodec_register_all(void);
2760 * Flush buffers, should be called when seeking or when switching to a different stream.
2762 void avcodec_flush_buffers(AVCodecContext *avctx);
2764 void avcodec_default_free_buffers(AVCodecContext *s);
2766 /* misc useful functions */
2769 * Returns a single letter to describe the given picture type \p pict_type.
2771 * @param[in] pict_type the picture type
2772 * @return A single character representing the picture type.
2774 char av_get_pict_type_char(int pict_type);
2777 * Returns codec bits per sample.
2779 * @param[in] codec_id the codec
2780 * @return Number of bits per sample or zero if unknown for the given codec.
2782 int av_get_bits_per_sample(enum CodecID codec_id);
2785 * Returns sample format bits per sample.
2787 * @param[in] sample_fmt the sample format
2788 * @return Number of bits per sample or zero if unknown for the given sample format.
2790 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
2793 typedef struct AVCodecParserContext {
2795 struct AVCodecParser *parser;
2796 int64_t frame_offset; /* offset of the current frame */
2797 int64_t cur_offset; /* current offset
2798 (incremented by each av_parser_parse()) */
2799 int64_t last_frame_offset; /* offset of the last frame */
2801 int pict_type; /* XXX: Put it back in AVCodecContext. */
2802 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
2803 int64_t pts; /* pts of the current frame */
2804 int64_t dts; /* dts of the current frame */
2809 int fetch_timestamp;
2811 #define AV_PARSER_PTS_NB 4
2812 int cur_frame_start_index;
2813 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
2814 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
2815 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
2818 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
2820 int64_t offset; ///< byte offset from starting packet start
2821 int64_t last_offset;
2822 } AVCodecParserContext;
2824 typedef struct AVCodecParser {
2825 int codec_ids[5]; /* several codec IDs are permitted */
2827 int (*parser_init)(AVCodecParserContext *s);
2828 int (*parser_parse)(AVCodecParserContext *s,
2829 AVCodecContext *avctx,
2830 const uint8_t **poutbuf, int *poutbuf_size,
2831 const uint8_t *buf, int buf_size);
2832 void (*parser_close)(AVCodecParserContext *s);
2833 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
2834 struct AVCodecParser *next;
2837 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2838 extern AVCodecParser *av_first_parser;
2840 AVCodecParser *av_parser_next(AVCodecParser *c);
2842 void av_register_codec_parser(AVCodecParser *parser);
2843 AVCodecParserContext *av_parser_init(int codec_id);
2844 int av_parser_parse(AVCodecParserContext *s,
2845 AVCodecContext *avctx,
2846 uint8_t **poutbuf, int *poutbuf_size,
2847 const uint8_t *buf, int buf_size,
2848 int64_t pts, int64_t dts);
2849 int av_parser_change(AVCodecParserContext *s,
2850 AVCodecContext *avctx,
2851 uint8_t **poutbuf, int *poutbuf_size,
2852 const uint8_t *buf, int buf_size, int keyframe);
2853 void av_parser_close(AVCodecParserContext *s);
2856 typedef struct AVBitStreamFilterContext {
2858 struct AVBitStreamFilter *filter;
2859 AVCodecParserContext *parser;
2860 struct AVBitStreamFilterContext *next;
2861 } AVBitStreamFilterContext;
2864 typedef struct AVBitStreamFilter {
2867 int (*filter)(AVBitStreamFilterContext *bsfc,
2868 AVCodecContext *avctx, const char *args,
2869 uint8_t **poutbuf, int *poutbuf_size,
2870 const uint8_t *buf, int buf_size, int keyframe);
2871 void (*close)(AVBitStreamFilterContext *bsfc);
2872 struct AVBitStreamFilter *next;
2873 } AVBitStreamFilter;
2875 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
2876 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
2877 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
2878 AVCodecContext *avctx, const char *args,
2879 uint8_t **poutbuf, int *poutbuf_size,
2880 const uint8_t *buf, int buf_size, int keyframe);
2881 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
2883 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
2888 * Reallocates the given block if it is not large enough, otherwise it
2893 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
2895 /* for static data only */
2898 * Frees all static arrays and resets their pointers to 0.
2899 * Call this function to release all statically allocated tables.
2901 * @deprecated. Code which uses av_free_static is broken/misdesigned
2902 * and should correctly use static arrays
2905 attribute_deprecated void av_free_static(void);
2908 * Allocation of static arrays.
2910 * @warning Do not use for normal allocation.
2912 * @param[in] size The amount of memory you need in bytes.
2913 * @return block of memory of the requested size
2914 * @deprecated. Code which uses av_mallocz_static is broken/misdesigned
2915 * and should correctly use static arrays
2917 attribute_deprecated void *av_mallocz_static(unsigned int size);
2920 * Copy image 'src' to 'dst'.
2922 void av_picture_copy(AVPicture *dst, const AVPicture *src,
2923 int pix_fmt, int width, int height);
2926 * Crop image top and left side.
2928 int av_picture_crop(AVPicture *dst, const AVPicture *src,
2929 int pix_fmt, int top_band, int left_band);
2934 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
2935 int padtop, int padbottom, int padleft, int padright, int *color);
2937 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2939 * @deprecated Use the software scaler (swscale) instead.
2941 attribute_deprecated void img_copy(AVPicture *dst, const AVPicture *src,
2942 int pix_fmt, int width, int height);
2945 * @deprecated Use the software scaler (swscale) instead.
2947 attribute_deprecated int img_crop(AVPicture *dst, const AVPicture *src,
2948 int pix_fmt, int top_band, int left_band);
2951 * @deprecated Use the software scaler (swscale) instead.
2953 attribute_deprecated int img_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
2954 int padtop, int padbottom, int padleft, int padright, int *color);
2957 extern unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
2960 * Parses \p str and put in \p width_ptr and \p height_ptr the detected values.
2962 * @return 0 in case of a successful parsing, a negative value otherwise
2963 * @param[in] str the string to parse: it has to be a string in the format
2964 * <width>x<height> or a valid video frame size abbreviation.
2965 * @param[in,out] width_ptr pointer to the variable which will contain the detected
2967 * @param[in,out] height_ptr pointer to the variable which will contain the detected
2968 * frame height value
2970 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
2973 * Parses \p str and put in \p frame_rate the detected values.
2975 * @return 0 in case of a successful parsing, a negative value otherwise
2976 * @param[in] str the string to parse: it has to be a string in the format
2977 * <frame_rate_nom>/<frame_rate_den>, a float number or a valid video rate abbreviation
2978 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
2981 int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
2983 /* error handling */
2985 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
2986 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
2988 /* Some platforms have E* and errno already negated. */
2989 #define AVERROR(e) (e)
2990 #define AVUNERROR(e) (e)
2992 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
2993 #define AVERROR_IO AVERROR(EIO) /**< I/O error */
2994 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< Number syntax expected in filename. */
2995 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
2996 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
2997 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
2998 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< Operation not supported. */
2999 #define AVERROR_NOENT AVERROR(ENOENT) /**< No such file or directory. */
3000 #define AVERROR_PATCHWELCOME -MKTAG('P','A','W','E') /**< Not yet implemented in FFmpeg. Patches welcome. */
3002 #endif /* FFMPEG_AVCODEC_H */