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
31 #include <sys/types.h> /* size_t */
33 #define AV_STRINGIFY(s) AV_TOSTRING(s)
34 #define AV_TOSTRING(s) #s
36 #define LIBAVCODEC_VERSION_INT ((51<<16)+(49<<8)+0)
37 #define LIBAVCODEC_VERSION 51.49.0
38 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
40 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
42 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
43 #define AV_TIME_BASE 1000000
44 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
47 * Identifies the syntax and semantics of the bitstream.
48 * The principle is roughly:
49 * Two decoders with the same ID can decode the same streams.
50 * Two encoders with the same ID can encode compatible streams.
51 * There may be slight deviations from the principle due to implementation
54 * If you add a codec ID to this list, add it so that
55 * 1. no value of a existing codec ID changes (that would break ABI),
56 * 2. it is as close as possible to similar codecs.
61 CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
62 CODEC_ID_MPEG2VIDEO_XVMC,
99 CODEC_ID_INTERPLAY_VIDEO,
111 CODEC_ID_TRUEMOTION1,
139 CODEC_ID_TRUEMOTION2,
156 CODEC_ID_DSICINVIDEO,
157 CODEC_ID_TIERTEXSEQVIDEO,
166 CODEC_ID_BETHSOFTVID,
173 /* various PCM "codecs" */
174 CODEC_ID_PCM_S16LE= 0x10000,
190 CODEC_ID_PCM_S24DAUD,
192 CODEC_ID_PCM_S16LE_PLANAR,
194 /* various ADPCM codecs */
195 CODEC_ID_ADPCM_IMA_QT= 0x11000,
196 CODEC_ID_ADPCM_IMA_WAV,
197 CODEC_ID_ADPCM_IMA_DK3,
198 CODEC_ID_ADPCM_IMA_DK4,
199 CODEC_ID_ADPCM_IMA_WS,
200 CODEC_ID_ADPCM_IMA_SMJPEG,
209 CODEC_ID_ADPCM_YAMAHA,
210 CODEC_ID_ADPCM_SBPRO_4,
211 CODEC_ID_ADPCM_SBPRO_3,
212 CODEC_ID_ADPCM_SBPRO_2,
214 CODEC_ID_ADPCM_IMA_AMV,
215 CODEC_ID_ADPCM_EA_R1,
216 CODEC_ID_ADPCM_EA_R3,
217 CODEC_ID_ADPCM_EA_R2,
218 CODEC_ID_ADPCM_IMA_EA_SEAD,
219 CODEC_ID_ADPCM_IMA_EA_EACS,
220 CODEC_ID_ADPCM_EA_XAS,
223 CODEC_ID_AMR_NB= 0x12000,
226 /* RealAudio codecs*/
227 CODEC_ID_RA_144= 0x13000,
230 /* various DPCM codecs */
231 CODEC_ID_ROQ_DPCM= 0x14000,
232 CODEC_ID_INTERPLAY_DPCM,
236 CODEC_ID_MP2= 0x15000,
237 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
239 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
258 CODEC_ID_WESTWOOD_SND1,
259 CODEC_ID_GSM, ///< as in Berlin toast format
267 CODEC_ID_DSICINAUDIO,
271 CODEC_ID_GSM_MS, /* as found in WAV */
278 /* subtitle codecs */
279 CODEC_ID_DVD_SUBTITLE= 0x17000,
280 CODEC_ID_DVB_SUBTITLE,
281 CODEC_ID_TEXT, ///< raw UTF-8 text
284 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
285 * stream (only used by libavformat) */
288 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
289 /* CODEC_ID_MP3LAME is obsolete */
290 #define CODEC_ID_MP3LAME CODEC_ID_MP3
291 #define CODEC_ID_MPEG4AAC CODEC_ID_AAC
295 CODEC_TYPE_UNKNOWN = -1,
304 * Currently unused, may be used if 24/32 bits samples are ever supported.
305 * all in native-endian format
308 SAMPLE_FMT_NONE = -1,
309 SAMPLE_FMT_U8, ///< unsigned 8 bits
310 SAMPLE_FMT_S16, ///< signed 16 bits
311 SAMPLE_FMT_S24, ///< signed 24 bits
312 SAMPLE_FMT_S32, ///< signed 32 bits
313 SAMPLE_FMT_FLT, ///< float
317 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
320 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
321 * This is mainly needed because some optimized bitstream readers read
322 * 32 or 64 bit at once and could read over the end.<br>
323 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
324 * MPEG bitstreams could cause overread and segfault.
326 #define FF_INPUT_BUFFER_PADDING_SIZE 8
329 * minimum encoding buffer size
330 * Used to avoid some checks during header writing.
332 #define FF_MIN_BUFFER_SIZE 16384
335 * motion estimation type.
338 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
342 ME_EPZS, ///< enhanced predictive zonal search
343 ME_X1, ///< reserved for experiments
344 ME_HEX, ///< hexagon based search
345 ME_UMH, ///< uneven multi-hexagon search
346 ME_ITER, ///< iterative search
350 /* We leave some space between them for extensions (drop some
351 * keyframes for intra-only or drop just some bidir frames). */
352 AVDISCARD_NONE =-16, ///< discard nothing
353 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
354 AVDISCARD_NONREF = 8, ///< discard all non reference
355 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
356 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
357 AVDISCARD_ALL = 48, ///< discard all
360 typedef struct RcOverride{
363 int qscale; // If this is 0 then quality_factor will be used instead.
364 float quality_factor;
367 #define FF_MAX_B_FRAMES 16
370 These flags can be passed in AVCodecContext.flags before initialization.
371 Note: Not everything is supported yet.
374 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
375 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
376 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
377 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
378 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
379 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
381 * The parent program guarantees that the input for B-frames containing
382 * streams is not written to for at least s->max_b_frames+1 frames, if
383 * this is not set the input will be copied.
385 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
386 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
387 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
388 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
389 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
390 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
391 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
392 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
393 location instead of only at frame boundaries. */
394 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
395 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
396 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
397 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
398 #define CODEC_FLAG_TRELLIS_QUANT 0x00200000 ///< Use trellis quantization.
399 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
400 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
401 /* Fx : Flag for h263+ extra options */
402 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
403 #define CODEC_FLAG_H263P_AIC 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction (remove this)
405 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
406 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
407 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
408 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
409 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
410 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
411 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
412 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
413 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
414 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
415 #define CODEC_FLAG_CLOSED_GOP ((int)0x80000000)
416 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
417 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
418 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
419 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
420 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
421 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
422 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
423 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
424 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
425 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
426 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
427 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
428 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
429 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
430 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
431 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
432 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
434 /* Unsupported options :
435 * Syntax Arithmetic coding (SAC)
436 * Reference Picture Selection
437 * Independent Segment Decoding */
439 /* codec capabilities */
441 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
443 * Codec uses get_buffer() for allocating buffers.
444 * direct rendering method 1
446 #define CODEC_CAP_DR1 0x0002
447 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
448 #define CODEC_CAP_PARSE_ONLY 0x0004
449 #define CODEC_CAP_TRUNCATED 0x0008
450 /* Codec can export data for HW decoding (XvMC). */
451 #define CODEC_CAP_HWACCEL 0x0010
453 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
454 * If this is not set, the codec is guaranteed to never be fed with NULL data.
456 #define CODEC_CAP_DELAY 0x0020
458 * Codec can be fed a final frame with a smaller size.
459 * This can be used to prevent truncation of the last audio samples.
461 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
463 //The following defines may change, don't expect compatibility if you use them.
464 #define MB_TYPE_INTRA4x4 0x0001
465 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
466 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
467 #define MB_TYPE_16x16 0x0008
468 #define MB_TYPE_16x8 0x0010
469 #define MB_TYPE_8x16 0x0020
470 #define MB_TYPE_8x8 0x0040
471 #define MB_TYPE_INTERLACED 0x0080
472 #define MB_TYPE_DIRECT2 0x0100 //FIXME
473 #define MB_TYPE_ACPRED 0x0200
474 #define MB_TYPE_GMC 0x0400
475 #define MB_TYPE_SKIP 0x0800
476 #define MB_TYPE_P0L0 0x1000
477 #define MB_TYPE_P1L0 0x2000
478 #define MB_TYPE_P0L1 0x4000
479 #define MB_TYPE_P1L1 0x8000
480 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
481 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
482 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
483 #define MB_TYPE_QUANT 0x00010000
484 #define MB_TYPE_CBP 0x00020000
485 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
489 * This specifies the area which should be displayed.
490 * Note there may be multiple such areas for one frame.
492 typedef struct AVPanScan{
495 * - encoding: Set by user.
496 * - decoding: Set by libavcodec.
501 * width and height in 1/16 pel
502 * - encoding: Set by user.
503 * - decoding: Set by libavcodec.
509 * position of the top left corner in 1/16 pel for up to 3 fields/frames
510 * - encoding: Set by user.
511 * - decoding: Set by libavcodec.
513 int16_t position[3][2];
516 #define FF_COMMON_FRAME \
518 * pointer to the picture planes.\
519 * This might be different from the first allocated byte\
526 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
527 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
533 * 1 -> keyframe, 0-> not\
534 * - encoding: Set by libavcodec.\
535 * - decoding: Set by libavcodec.\
540 * Picture type of the frame, see ?_TYPE below.\
541 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
542 * - decoding: Set by libavcodec.\
547 * presentation timestamp in time_base units (time when frame should be shown to user)\
548 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
549 * - encoding: MUST be set by user.\
550 * - decoding: Set by libavcodec.\
555 * picture number in bitstream order\
556 * - encoding: set by\
557 * - decoding: Set by libavcodec.\
559 int coded_picture_number;\
561 * picture number in display order\
562 * - encoding: set by\
563 * - decoding: Set by libavcodec.\
565 int display_picture_number;\
568 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
569 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
570 * - decoding: Set by libavcodec.\
575 * buffer age (1->was last buffer and dint change, 2->..., ...).\
576 * Set to INT_MAX if the buffer has not been used yet.\
577 * - encoding: unused\
578 * - decoding: MUST be set by get_buffer().\
583 * is this picture used as reference\
584 * - encoding: unused\
585 * - decoding: Set by libavcodec. (before get_buffer() call)).\
591 * - encoding: unused\
592 * - decoding: Set by libavcodec.\
594 int8_t *qscale_table;\
597 * - encoding: unused\
598 * - decoding: Set by libavcodec.\
603 * mbskip_table[mb]>=1 if MB didn't change\
604 * stride= mb_width = (width+15)>>4\
605 * - encoding: unused\
606 * - decoding: Set by libavcodec.\
608 uint8_t *mbskip_table;\
611 * motion vector table\
614 * int mv_sample_log2= 4 - motion_subsample_log2;\
615 * int mb_width= (width+15)>>4;\
616 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
617 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
619 * - encoding: Set by user.\
620 * - decoding: Set by libavcodec.\
622 int16_t (*motion_val[2])[2];\
625 * macroblock type table\
626 * mb_type_base + mb_width + 2\
627 * - encoding: Set by user.\
628 * - decoding: Set by libavcodec.\
633 * log2 of the size of the block which a single vector in motion_val represents: \
634 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
635 * - encoding: unused\
636 * - decoding: Set by libavcodec.\
638 uint8_t motion_subsample_log2;\
641 * for some private data of the user\
642 * - encoding: unused\
643 * - decoding: Set by user.\
649 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
650 * - decoding: unused\
655 * type of the buffer (to keep track of who has to deallocate data[*])\
656 * - encoding: Set by the one who allocates it.\
657 * - decoding: Set by the one who allocates it.\
658 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
663 * When decoding, this signals how much the picture must be delayed.\
664 * extra_delay = repeat_pict / (2*fps)\
665 * - encoding: unused\
666 * - decoding: Set by libavcodec.\
676 * The content of the picture is interlaced.\
677 * - encoding: Set by user.\
678 * - decoding: Set by libavcodec. (default 0)\
680 int interlaced_frame;\
683 * If the content is interlaced, is top field displayed first.\
684 * - encoding: Set by user.\
685 * - decoding: Set by libavcodec.\
687 int top_field_first;\
691 * - encoding: Set by user.\
692 * - decoding: Set by libavcodec.\
694 AVPanScan *pan_scan;\
697 * Tell user application that palette has changed from previous frame.\
698 * - encoding: ??? (no palette-enabled encoder yet)\
699 * - decoding: Set by libavcodec. (default 0).\
701 int palette_has_changed;\
704 * codec suggestion on buffer type if != 0\
705 * - encoding: unused\
706 * - decoding: Set by libavcodec. (before get_buffer() call)).\
712 * - encoding: unused\
713 * - decoding: Set by libavcodec.\
718 * motion referece frame index\
719 * - encoding: Set by user.\
720 * - decoding: Set by libavcodec.\
722 int8_t *ref_index[2];
724 #define FF_QSCALE_TYPE_MPEG1 0
725 #define FF_QSCALE_TYPE_MPEG2 1
726 #define FF_QSCALE_TYPE_H264 2
728 #define FF_BUFFER_TYPE_INTERNAL 1
729 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
730 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
731 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
734 #define FF_I_TYPE 1 // Intra
735 #define FF_P_TYPE 2 // Predicted
736 #define FF_B_TYPE 3 // Bi-dir predicted
737 #define FF_S_TYPE 4 // S(GMC)-VOP MPEG4
741 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
742 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
743 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
744 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
749 typedef struct AVFrame {
753 #define DEFAULT_FRAME_RATE_BASE 1001000
756 * main external API structure.
757 * New fields can be added to the end with minor version bumps.
758 * Removial, reordering and changes to existing fields require a Major
760 * sizeof(AVCodecContext) must not be used outside libav*
762 typedef struct AVCodecContext {
764 * information on struct for av_log
765 * - set by avcodec_alloc_context
769 * the average bitrate
770 * - encoding: Set by user; unused for constant quantizer encoding.
771 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
776 * number of bits the bitstream is allowed to diverge from the reference.
777 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
778 * - encoding: Set by user; unused for constant quantizer encoding.
781 int bit_rate_tolerance;
785 * - encoding: Set by user.
786 * - decoding: Set by user.
791 * Some codecs need additional format info. It is stored here.
792 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
793 * specific codec MUST set it correctly otherwise stream copy breaks.
794 * In general use of this field by muxers is not recommanded.
795 * - encoding: Set by libavcodec.
796 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
801 * Motion estimation algorithm used for video coding.
802 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
803 * 8 (umh), 9 (iter) [7, 8 are x264 specific, 9 is snow specific]
804 * - encoding: MUST be set by user.
810 * some codecs need / can use extradata like Huffman tables.
811 * mjpeg: Huffman tables
812 * rv10: additional flags
813 * mpeg4: global headers (they can be in the bitstream or here)
814 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
815 * than extradata_size to avoid prolems if it is read with the bitstream reader.
816 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
817 * - encoding: Set/allocated/freed by libavcodec.
818 * - decoding: Set/allocated/freed by user.
824 * This is the fundamental unit of time (in seconds) in terms
825 * of which frame timestamps are represented. For fixed-fps content,
826 * timebase should be 1/framerate and timestamp increments should be
828 * - encoding: MUST be set by user.
829 * - decoding: Set by libavcodec.
831 AVRational time_base;
835 * picture width / height.
836 * - encoding: MUST be set by user.
837 * - decoding: Set by libavcodec.
838 * Note: For compatibility it is possible to set this instead of
839 * coded_width/height before decoding.
843 #define FF_ASPECT_EXTENDED 15
846 * the number of pictures in a group of pictures, or 0 for intra_only
847 * - encoding: Set by user.
853 * Pixel format, see PIX_FMT_xxx.
854 * - encoding: Set by user.
855 * - decoding: Set by libavcodec.
857 enum PixelFormat pix_fmt;
860 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
861 * has to read frames at native frame rate.
862 * - encoding: Set by user.
868 * If non NULL, 'draw_horiz_band' is called by the libavcodec
869 * decoder to draw a horizontal band. It improves cache usage. Not
870 * all codecs can do that. You must check the codec capabilities
873 * - decoding: Set by user.
874 * @param height the height of the slice
875 * @param y the y position of the slice
876 * @param type 1->top field, 2->bottom field, 3->frame
877 * @param offset offset into the AVFrame.data from which the slice should be read
879 void (*draw_horiz_band)(struct AVCodecContext *s,
880 const AVFrame *src, int offset[4],
881 int y, int type, int height);
884 int sample_rate; ///< samples per second
888 * audio sample format
889 * - encoding: Set by user.
890 * - decoding: Set by libavcodec.
892 enum SampleFormat sample_fmt; ///< sample format, currently unused
894 /* The following data should not be initialized. */
896 * Samples per packet, initialized when calling 'init'.
899 int frame_number; ///< audio or video frame number
900 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
903 * Number of frames the decoded output will be delayed relative to
905 * - encoding: Set by libavcodec.
910 /* - encoding parameters */
911 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
912 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
916 * - encoding: Set by user.
923 * - encoding: Set by user.
929 * maximum quantizer difference between frames
930 * - encoding: Set by user.
936 * maximum number of B-frames between non-B-frames
937 * Note: The output will be delayed by max_b_frames+1 relative to the input.
938 * - encoding: Set by user.
944 * qscale factor between IP and B-frames
945 * - encoding: Set by user.
948 float b_quant_factor;
950 /** obsolete FIXME remove */
952 #define FF_RC_STRATEGY_XVID 1
954 int b_frame_strategy;
959 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
960 * @deprecated Deprecated in favor of skip_idct and skip_frame.
964 struct AVCodec *codec;
968 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
969 /* unused, FIXME remove*/
973 int rtp_payload_size; /* The size of the RTP payload: the coder will */
974 /* do its best to deliver a chunk with size */
975 /* below rtp_payload_size, the chunk will start */
976 /* with a start code on some codecs like H.263. */
977 /* This doesn't take account of any particular */
978 /* headers inside the transmitted RTP payload. */
981 /* The RTP callback: This function is called */
982 /* every time the encoder has a packet to send. */
983 /* It depends on the encoder if the data starts */
984 /* with a Start Code (it should). H.263 does. */
985 /* mb_nb contains the number of macroblocks */
986 /* encoded in the RTP payload. */
987 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
989 /* statistics, used for 2-pass encoding */
1000 * number of bits used for the previously encoded frame
1001 * - encoding: Set by libavcodec.
1002 * - decoding: unused
1007 * Private data of the user, can be used to carry app specific stuff.
1008 * - encoding: Set by user.
1009 * - decoding: Set by user.
1013 char codec_name[32];
1014 enum CodecType codec_type; /* see CODEC_TYPE_xxx */
1015 enum CodecID codec_id; /* see CODEC_ID_xxx */
1018 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1019 * This is used to work around some encoder bugs.
1020 * A demuxer should set this to what is stored in the field used to identify the codec.
1021 * If there are multiple such fields in a container then the demuxer should choose the one
1022 * which maximizes the information about the used codec.
1023 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1024 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1025 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1027 * - encoding: Set by user, if not then the default based on codec_id will be used.
1028 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1030 unsigned int codec_tag;
1033 * Work around bugs in encoders which sometimes cannot be detected automatically.
1034 * - encoding: Set by user
1035 * - decoding: Set by user
1037 int workaround_bugs;
1038 #define FF_BUG_AUTODETECT 1 ///< autodetection
1039 #define FF_BUG_OLD_MSMPEG4 2
1040 #define FF_BUG_XVID_ILACE 4
1041 #define FF_BUG_UMP4 8
1042 #define FF_BUG_NO_PADDING 16
1043 #define FF_BUG_AMV 32
1044 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1045 #define FF_BUG_QPEL_CHROMA 64
1046 #define FF_BUG_STD_QPEL 128
1047 #define FF_BUG_QPEL_CHROMA2 256
1048 #define FF_BUG_DIRECT_BLOCKSIZE 512
1049 #define FF_BUG_EDGE 1024
1050 #define FF_BUG_HPEL_CHROMA 2048
1051 #define FF_BUG_DC_CLIP 4096
1052 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1053 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1056 * luma single coefficient elimination threshold
1057 * - encoding: Set by user.
1058 * - decoding: unused
1060 int luma_elim_threshold;
1063 * chroma single coeff elimination threshold
1064 * - encoding: Set by user.
1065 * - decoding: unused
1067 int chroma_elim_threshold;
1070 * strictly follow the standard (MPEG4, ...).
1071 * - encoding: Set by user.
1072 * - decoding: unused
1074 int strict_std_compliance;
1075 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1076 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1077 #define FF_COMPLIANCE_NORMAL 0
1078 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1079 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1082 * qscale offset between IP and B-frames
1083 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1084 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1085 * - encoding: Set by user.
1086 * - decoding: unused
1088 float b_quant_offset;
1091 * Error resilience; higher values will detect more errors but may
1092 * misdetect some more or less valid parts as errors.
1093 * - encoding: unused
1094 * - decoding: Set by user.
1096 int error_resilience;
1097 #define FF_ER_CAREFUL 1
1098 #define FF_ER_COMPLIANT 2
1099 #define FF_ER_AGGRESSIVE 3
1100 #define FF_ER_VERY_AGGRESSIVE 4
1103 * Called at the beginning of each frame to get a buffer for it.
1104 * If pic.reference is set then the frame will be read later by libavcodec.
1105 * avcodec_align_dimensions() should be used to find the required width and
1106 * height, as they normally need to be rounded up to the next multiple of 16.
1107 * - encoding: unused
1108 * - decoding: Set by libavcodec., user can override.
1110 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1113 * Called to release buffers which where allocated with get_buffer.
1114 * A released buffer can be reused in get_buffer().
1115 * pic.data[*] must be set to NULL.
1116 * - encoding: unused
1117 * - decoding: Set by libavcodec., user can override.
1119 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1122 * If 1 the stream has a 1 frame delay during decoding.
1123 * - encoding: Set by libavcodec.
1124 * - decoding: Set by libavcodec.
1129 * number of bytes per packet if constant and known or 0
1130 * Used by some WAV based audio codecs.
1134 int parse_only; /* - decoding only: If true, only parsing is done
1135 (function avcodec_parse_frame()). The frame
1136 data is returned. Only MPEG codecs support this now. */
1139 * 0-> h263 quant 1-> mpeg quant
1140 * - encoding: Set by user.
1141 * - decoding: unused
1146 * pass1 encoding statistics output buffer
1147 * - encoding: Set by libavcodec.
1148 * - decoding: unused
1153 * pass2 encoding statistics input buffer
1154 * Concatenated stuff from stats_out of pass1 should be placed here.
1155 * - encoding: Allocated/set/freed by user.
1156 * - decoding: unused
1161 * ratecontrol qmin qmax limiting method
1162 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1163 * - encoding: Set by user.
1164 * - decoding: unused
1172 * ratecontrol override, see RcOverride
1173 * - encoding: Allocated/set/freed by user.
1174 * - decoding: unused
1176 RcOverride *rc_override;
1177 int rc_override_count;
1180 * rate control equation
1181 * - encoding: Set by user
1182 * - decoding: unused
1188 * - encoding: Set by user.
1189 * - decoding: unused
1195 * - encoding: Set by user.
1196 * - decoding: unused
1201 * decoder bitstream buffer size
1202 * - encoding: Set by user.
1203 * - decoding: unused
1206 float rc_buffer_aggressivity;
1209 * qscale factor between P and I-frames
1210 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1211 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1212 * - encoding: Set by user.
1213 * - decoding: unused
1215 float i_quant_factor;
1218 * qscale offset between P and I-frames
1219 * - encoding: Set by user.
1220 * - decoding: unused
1222 float i_quant_offset;
1225 * initial complexity for pass1 ratecontrol
1226 * - encoding: Set by user.
1227 * - decoding: unused
1229 float rc_initial_cplx;
1232 * DCT algorithm, see FF_DCT_* below
1233 * - encoding: Set by user.
1234 * - decoding: unused
1237 #define FF_DCT_AUTO 0
1238 #define FF_DCT_FASTINT 1
1239 #define FF_DCT_INT 2
1240 #define FF_DCT_MMX 3
1241 #define FF_DCT_MLIB 4
1242 #define FF_DCT_ALTIVEC 5
1243 #define FF_DCT_FAAN 6
1246 * luminance masking (0-> disabled)
1247 * - encoding: Set by user.
1248 * - decoding: unused
1253 * temporary complexity masking (0-> disabled)
1254 * - encoding: Set by user.
1255 * - decoding: unused
1257 float temporal_cplx_masking;
1260 * spatial complexity masking (0-> disabled)
1261 * - encoding: Set by user.
1262 * - decoding: unused
1264 float spatial_cplx_masking;
1267 * p block masking (0-> disabled)
1268 * - encoding: Set by user.
1269 * - decoding: unused
1274 * darkness masking (0-> disabled)
1275 * - encoding: Set by user.
1276 * - decoding: unused
1281 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
1282 /* for binary compatibility */
1287 * IDCT algorithm, see FF_IDCT_* below.
1288 * - encoding: Set by user.
1289 * - decoding: Set by user.
1292 #define FF_IDCT_AUTO 0
1293 #define FF_IDCT_INT 1
1294 #define FF_IDCT_SIMPLE 2
1295 #define FF_IDCT_SIMPLEMMX 3
1296 #define FF_IDCT_LIBMPEG2MMX 4
1297 #define FF_IDCT_PS2 5
1298 #define FF_IDCT_MLIB 6
1299 #define FF_IDCT_ARM 7
1300 #define FF_IDCT_ALTIVEC 8
1301 #define FF_IDCT_SH4 9
1302 #define FF_IDCT_SIMPLEARM 10
1303 #define FF_IDCT_H264 11
1304 #define FF_IDCT_VP3 12
1305 #define FF_IDCT_IPP 13
1306 #define FF_IDCT_XVIDMMX 14
1307 #define FF_IDCT_CAVS 15
1308 #define FF_IDCT_SIMPLEARMV5TE 16
1309 #define FF_IDCT_SIMPLEARMV6 17
1310 #define FF_IDCT_SIMPLEVIS 18
1311 #define FF_IDCT_WMV2 19
1315 * - encoding: Set by libavcodec.
1316 * - decoding: Set by user (or 0).
1320 * slice offsets in the frame in bytes
1321 * - encoding: Set/allocated by libavcodec.
1322 * - decoding: Set/allocated by user (or NULL).
1327 * error concealment flags
1328 * - encoding: unused
1329 * - decoding: Set by user.
1331 int error_concealment;
1332 #define FF_EC_GUESS_MVS 1
1333 #define FF_EC_DEBLOCK 2
1336 * dsp_mask could be add used to disable unwanted CPU features
1337 * CPU features (i.e. MMX, SSE. ...)
1339 * With the FORCE flag you may instead enable given CPU features.
1340 * (Dangerous: Usable in case of misdetection, improper usage however will
1341 * result into program crash.)
1344 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1345 /* lower 16 bits - CPU features */
1346 #define FF_MM_MMX 0x0001 ///< standard MMX
1347 #define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
1348 #define FF_MM_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
1349 #define FF_MM_SSE 0x0008 ///< SSE functions
1350 #define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
1351 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1352 #define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
1353 #define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
1354 #define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
1357 * bits per sample/pixel from the demuxer (needed for huffyuv).
1358 * - encoding: Set by libavcodec.
1359 * - decoding: Set by user.
1361 int bits_per_sample;
1364 * prediction method (needed for huffyuv)
1365 * - encoding: Set by user.
1366 * - decoding: unused
1368 int prediction_method;
1369 #define FF_PRED_LEFT 0
1370 #define FF_PRED_PLANE 1
1371 #define FF_PRED_MEDIAN 2
1374 * sample aspect ratio (0 if unknown)
1375 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1376 * - encoding: Set by user.
1377 * - decoding: Set by libavcodec.
1379 AVRational sample_aspect_ratio;
1382 * the picture in the bitstream
1383 * - encoding: Set by libavcodec.
1384 * - decoding: Set by libavcodec.
1386 AVFrame *coded_frame;
1390 * - encoding: Set by user.
1391 * - decoding: Set by user.
1394 #define FF_DEBUG_PICT_INFO 1
1395 #define FF_DEBUG_RC 2
1396 #define FF_DEBUG_BITSTREAM 4
1397 #define FF_DEBUG_MB_TYPE 8
1398 #define FF_DEBUG_QP 16
1399 #define FF_DEBUG_MV 32
1400 #define FF_DEBUG_DCT_COEFF 0x00000040
1401 #define FF_DEBUG_SKIP 0x00000080
1402 #define FF_DEBUG_STARTCODE 0x00000100
1403 #define FF_DEBUG_PTS 0x00000200
1404 #define FF_DEBUG_ER 0x00000400
1405 #define FF_DEBUG_MMCO 0x00000800
1406 #define FF_DEBUG_BUGS 0x00001000
1407 #define FF_DEBUG_VIS_QP 0x00002000
1408 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1412 * - encoding: Set by user.
1413 * - decoding: Set by user.
1416 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1417 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1418 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1422 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1423 * - decoding: unused
1428 * minimum MB quantizer
1429 * - encoding: unused
1430 * - decoding: unused
1435 * maximum MB quantizer
1436 * - encoding: unused
1437 * - decoding: unused
1442 * motion estimation comparison function
1443 * - encoding: Set by user.
1444 * - decoding: unused
1448 * subpixel motion estimation comparison function
1449 * - encoding: Set by user.
1450 * - decoding: unused
1454 * macroblock comparison function (not supported yet)
1455 * - encoding: Set by user.
1456 * - decoding: unused
1460 * interlaced DCT comparison function
1461 * - encoding: Set by user.
1462 * - decoding: unused
1465 #define FF_CMP_SAD 0
1466 #define FF_CMP_SSE 1
1467 #define FF_CMP_SATD 2
1468 #define FF_CMP_DCT 3
1469 #define FF_CMP_PSNR 4
1470 #define FF_CMP_BIT 5
1472 #define FF_CMP_ZERO 7
1473 #define FF_CMP_VSAD 8
1474 #define FF_CMP_VSSE 9
1475 #define FF_CMP_NSSE 10
1476 #define FF_CMP_W53 11
1477 #define FF_CMP_W97 12
1478 #define FF_CMP_DCTMAX 13
1479 #define FF_CMP_DCT264 14
1480 #define FF_CMP_CHROMA 256
1483 * ME diamond size & shape
1484 * - encoding: Set by user.
1485 * - decoding: unused
1490 * amount of previous MV predictors (2a+1 x 2a+1 square)
1491 * - encoding: Set by user.
1492 * - decoding: unused
1494 int last_predictor_count;
1497 * prepass for motion estimation
1498 * - encoding: Set by user.
1499 * - decoding: unused
1504 * motion estimation prepass comparison function
1505 * - encoding: Set by user.
1506 * - decoding: unused
1511 * ME prepass diamond size & shape
1512 * - encoding: Set by user.
1513 * - decoding: unused
1519 * - encoding: Set by user.
1520 * - decoding: unused
1522 int me_subpel_quality;
1525 * callback to negotiate the pixelFormat
1526 * @param fmt is the list of formats which are supported by the codec,
1527 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1528 * The first is always the native one.
1529 * @return the chosen format
1530 * - encoding: unused
1531 * - decoding: Set by user, if not set the native format will be chosen.
1533 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1536 * DTG active format information (additional aspect ratio
1537 * information only used in DVB MPEG-2 transport streams)
1540 * - encoding: unused
1541 * - decoding: Set by decoder.
1543 int dtg_active_format;
1544 #define FF_DTG_AFD_SAME 8
1545 #define FF_DTG_AFD_4_3 9
1546 #define FF_DTG_AFD_16_9 10
1547 #define FF_DTG_AFD_14_9 11
1548 #define FF_DTG_AFD_4_3_SP_14_9 13
1549 #define FF_DTG_AFD_16_9_SP_14_9 14
1550 #define FF_DTG_AFD_SP_4_3 15
1553 * maximum motion estimation search range in subpel units
1554 * If 0 then no limit.
1556 * - encoding: Set by user.
1557 * - decoding: unused
1562 * intra quantizer bias
1563 * - encoding: Set by user.
1564 * - decoding: unused
1566 int intra_quant_bias;
1567 #define FF_DEFAULT_QUANT_BIAS 999999
1570 * inter quantizer bias
1571 * - encoding: Set by user.
1572 * - decoding: unused
1574 int inter_quant_bias;
1578 * - encoding: unused
1579 * - decoding: Which clrtable should be used for 8bit RGB images.
1580 * Tables have to be stored somewhere. FIXME
1585 * internal_buffer count
1586 * Don't touch, used by libavcodec default_get_buffer().
1588 int internal_buffer_count;
1592 * Don't touch, used by libavcodec default_get_buffer().
1594 void *internal_buffer;
1596 #define FF_LAMBDA_SHIFT 7
1597 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1598 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1599 #define FF_LAMBDA_MAX (256*128-1)
1601 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1603 * Global quality for codecs which cannot change it per frame.
1604 * This should be proportional to MPEG-1/2/4 qscale.
1605 * - encoding: Set by user.
1606 * - decoding: unused
1610 #define FF_CODER_TYPE_VLC 0
1611 #define FF_CODER_TYPE_AC 1
1612 #define FF_CODER_TYPE_RAW 2
1613 #define FF_CODER_TYPE_RLE 3
1614 #define FF_CODER_TYPE_DEFLATE 4
1617 * - encoding: Set by user.
1618 * - decoding: unused
1624 * - encoding: Set by user.
1625 * - decoding: unused
1631 * - encoding: unused
1632 * - decoding: Set by user.
1634 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1639 * - encoding: unused
1640 * - decoding: Set by user.
1643 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1644 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1645 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1648 * XVideo Motion Acceleration
1649 * - encoding: forbidden
1650 * - decoding: set by decoder
1652 int xvmc_acceleration;
1655 * macroblock decision mode
1656 * - encoding: Set by user.
1657 * - decoding: unused
1660 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1661 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1662 #define FF_MB_DECISION_RD 2 ///< rate distoration
1665 * custom intra quantization matrix
1666 * - encoding: Set by user, can be NULL.
1667 * - decoding: Set by libavcodec.
1669 uint16_t *intra_matrix;
1672 * custom inter quantization matrix
1673 * - encoding: Set by user, can be NULL.
1674 * - decoding: Set by libavcodec.
1676 uint16_t *inter_matrix;
1679 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1680 * This is used to work around some encoder bugs.
1681 * - encoding: unused
1682 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1684 unsigned int stream_codec_tag;
1687 * scene change detection threshold
1688 * 0 is default, larger means fewer detected scene changes.
1689 * - encoding: Set by user.
1690 * - decoding: unused
1692 int scenechange_threshold;
1695 * minimum Lagrange multipler
1696 * - encoding: Set by user.
1697 * - decoding: unused
1702 * maximum Lagrange multipler
1703 * - encoding: Set by user.
1704 * - decoding: unused
1709 * palette control structure
1710 * - encoding: ??? (no palette-enabled encoder yet)
1711 * - decoding: Set by user.
1713 struct AVPaletteControl *palctrl;
1716 * noise reduction strength
1717 * - encoding: Set by user.
1718 * - decoding: unused
1720 int noise_reduction;
1723 * Called at the beginning of a frame to get cr buffer for it.
1724 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1725 * libavcodec will pass previous buffer in pic, function should return
1726 * same buffer or new buffer with old frame "painted" into it.
1727 * If pic.data[0] == NULL must behave like get_buffer().
1728 * - encoding: unused
1729 * - decoding: Set by libavcodec., user can override
1731 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1734 * Number of bits which should be loaded into the rc buffer before decoding starts.
1735 * - encoding: Set by user.
1736 * - decoding: unused
1738 int rc_initial_buffer_occupancy;
1742 * - encoding: Set by user.
1743 * - decoding: unused
1745 int inter_threshold;
1749 * - encoding: Set by user.
1750 * - decoding: Set by user.
1755 * Simulates errors in the bitstream to test error concealment.
1756 * - encoding: Set by user.
1757 * - decoding: unused
1762 * MP3 antialias algorithm, see FF_AA_* below.
1763 * - encoding: unused
1764 * - decoding: Set by user.
1767 #define FF_AA_AUTO 0
1768 #define FF_AA_FASTINT 1 //not implemented yet
1770 #define FF_AA_FLOAT 3
1772 * quantizer noise shaping
1773 * - encoding: Set by user.
1774 * - decoding: unused
1776 int quantizer_noise_shaping;
1780 * is used to decide how many independent tasks should be passed to execute()
1781 * - encoding: Set by user.
1782 * - decoding: Set by user.
1787 * The codec may call this to execute several independent things.
1788 * It will return only after finishing all tasks.
1789 * The user may replace this with some multithreaded implementation,
1790 * the default implementation will execute the parts serially.
1791 * @param count the number of things to execute
1792 * - encoding: Set by libavcodec, user can override.
1793 * - decoding: Set by libavcodec, user can override.
1795 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void **arg2, int *ret, int count);
1799 * Can be used by execute() to store some per AVCodecContext stuff.
1800 * - encoding: set by execute()
1801 * - decoding: set by execute()
1803 void *thread_opaque;
1806 * Motion estimation threshold below which no motion estimation is
1807 * performed, but instead the user specified motion vectors are used.
1809 * - encoding: Set by user.
1810 * - decoding: unused
1815 * Macroblock threshold below which the user specified macroblock types will be used.
1816 * - encoding: Set by user.
1817 * - decoding: unused
1822 * precision of the intra DC coefficient - 8
1823 * - encoding: Set by user.
1824 * - decoding: unused
1826 int intra_dc_precision;
1829 * noise vs. sse weight for the nsse comparsion function
1830 * - encoding: Set by user.
1831 * - decoding: unused
1836 * Number of macroblock rows at the top which are skipped.
1837 * - encoding: unused
1838 * - decoding: Set by user.
1843 * Number of macroblock rows at the bottom which are skipped.
1844 * - encoding: unused
1845 * - decoding: Set by user.
1851 * - encoding: Set by user.
1852 * - decoding: Set by libavcodec.
1855 #define FF_PROFILE_UNKNOWN -99
1856 #define FF_PROFILE_AAC_MAIN 0
1857 #define FF_PROFILE_AAC_LOW 1
1858 #define FF_PROFILE_AAC_SSR 2
1859 #define FF_PROFILE_AAC_LTP 3
1863 * - encoding: Set by user.
1864 * - decoding: Set by libavcodec.
1867 #define FF_LEVEL_UNKNOWN -99
1870 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1871 * - encoding: unused
1872 * - decoding: Set by user.
1877 * Bitstream width / height, may be different from width/height if lowres
1878 * or other things are used.
1879 * - encoding: unused
1880 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1882 int coded_width, coded_height;
1885 * frame skip threshold
1886 * - encoding: Set by user.
1887 * - decoding: unused
1889 int frame_skip_threshold;
1893 * - encoding: Set by user.
1894 * - decoding: unused
1896 int frame_skip_factor;
1899 * frame skip exponent
1900 * - encoding: Set by user.
1901 * - decoding: unused
1906 * frame skip comparison function
1907 * - encoding: Set by user.
1908 * - decoding: unused
1913 * Border processing masking, raises the quantizer for mbs on the borders
1915 * - encoding: Set by user.
1916 * - decoding: unused
1918 float border_masking;
1921 * minimum MB lagrange multipler
1922 * - encoding: Set by user.
1923 * - decoding: unused
1928 * maximum MB lagrange multipler
1929 * - encoding: Set by user.
1930 * - decoding: unused
1936 * - encoding: Set by user.
1937 * - decoding: unused
1939 int me_penalty_compensation;
1943 * - encoding: unused
1944 * - decoding: Set by user.
1946 enum AVDiscard skip_loop_filter;
1950 * - encoding: unused
1951 * - decoding: Set by user.
1953 enum AVDiscard skip_idct;
1957 * - encoding: unused
1958 * - decoding: Set by user.
1960 enum AVDiscard skip_frame;
1964 * - encoding: Set by user.
1965 * - decoding: unused
1971 * - encoding: Set by user.
1972 * - decoding: unused
1977 * constant rate factor - quality-based VBR - values ~correspond to qps
1978 * - encoding: Set by user.
1979 * - decoding: unused
1984 * constant quantization parameter rate control method
1985 * - encoding: Set by user.
1986 * - decoding: unused
1992 * - encoding: Set by user.
1993 * - decoding: unused
1998 * number of reference frames
1999 * - encoding: Set by user.
2000 * - decoding: unused
2005 * chroma qp offset from luma
2006 * - encoding: Set by user.
2007 * - decoding: unused
2012 * Influences how often B-frames are used.
2013 * - encoding: Set by user.
2014 * - decoding: unused
2019 * trellis RD quantization
2020 * - encoding: Set by user.
2021 * - decoding: unused
2026 * Reduce fluctuations in qp (before curve compression).
2027 * - encoding: Set by user.
2028 * - decoding: unused
2030 float complexityblur;
2033 * in-loop deblocking filter alphac0 parameter
2034 * alpha is in the range -6...6
2035 * - encoding: Set by user.
2036 * - decoding: unused
2041 * in-loop deblocking filter beta parameter
2042 * beta is in the range -6...6
2043 * - encoding: Set by user.
2044 * - decoding: unused
2049 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2050 * - encoding: Set by user.
2051 * - decoding: unused
2054 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2055 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2056 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2057 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2058 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2061 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal)
2062 * - encoding: Set by user.
2063 * - decoding: unused
2068 * Audio cutoff bandwidth (0 means "automatic"), currently used only by FAAC.
2069 * - encoding: Set by user.
2070 * - decoding: unused
2075 * Multiplied by qscale for each frame and added to scene_change_score.
2076 * - encoding: Set by user.
2077 * - decoding: unused
2079 int scenechange_factor;
2083 * Note: Value depends upon the compare function used for fullpel ME.
2084 * - encoding: Set by user.
2085 * - decoding: unused
2090 * Adjusts sensitivity of b_frame_strategy 1.
2091 * - encoding: Set by user.
2092 * - decoding: unused
2097 * - encoding: Set by user.
2098 * - decoding: unused
2100 int compression_level;
2101 #define FF_COMPRESSION_DEFAULT -1
2104 * Sets whether to use LPC mode - used by FLAC encoder.
2105 * - encoding: Set by user.
2106 * - decoding: unused
2111 * LPC coefficient precision - used by FLAC encoder
2112 * - encoding: Set by user.
2113 * - decoding: unused
2115 int lpc_coeff_precision;
2118 * - encoding: Set by user.
2119 * - decoding: unused
2121 int min_prediction_order;
2124 * - encoding: Set by user.
2125 * - decoding: unused
2127 int max_prediction_order;
2130 * search method for selecting prediction order
2131 * - encoding: Set by user.
2132 * - decoding: unused
2134 int prediction_order_method;
2137 * - encoding: Set by user.
2138 * - decoding: unused
2140 int min_partition_order;
2143 * - encoding: Set by user.
2144 * - decoding: unused
2146 int max_partition_order;
2149 * GOP timecode frame start number, in non drop frame format
2150 * - encoding: Set by user.
2151 * - decoding: unused
2153 int64_t timecode_frame_start;
2156 * Decoder should decode to this many channels if it can (0 for default)
2157 * - encoding: unused
2158 * - decoding: Set by user.
2160 int request_channels;
2163 * Percentage of dynamic range compression to be applied by the decoder.
2164 * The default value is 1.0, corresponding to full compression.
2165 * - encoding: unused
2166 * - decoding: Set by user.
2174 typedef struct AVCodec {
2176 * Name of the codec implementation.
2177 * The name is globally unique among encoders and among decoders (but an
2178 * encoder and a decoder can share the same name).
2179 * This is the primary way to find a codec from the user perspective.
2182 enum CodecType type;
2185 int (*init)(AVCodecContext *);
2186 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2187 int (*close)(AVCodecContext *);
2188 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size,
2189 uint8_t *buf, int buf_size);
2191 struct AVCodec *next;
2192 void (*flush)(AVCodecContext *);
2193 const AVRational *supported_framerates; ///array of supported framerates, or NULL if any, array is terminated by {0,0}
2194 const enum PixelFormat *pix_fmts; ///array of supported pixel formats, or NULL if unknown, array is terminanted by -1
2198 * four components are given, that's all.
2199 * the last component is alpha
2201 typedef struct AVPicture {
2203 int linesize[4]; ///< number of bytes per line
2208 * This structure defines a method for communicating palette changes
2209 * between and demuxer and a decoder.
2211 * @deprecated Use AVPacket to send palette changes instead.
2212 * This is totally broken.
2214 #define AVPALETTE_SIZE 1024
2215 #define AVPALETTE_COUNT 256
2216 typedef struct AVPaletteControl {
2218 /* Demuxer sets this to 1 to indicate the palette has changed;
2219 * decoder resets to 0. */
2220 int palette_changed;
2222 /* 4-byte ARGB palette entries, stored in native byte order; note that
2223 * the individual palette components should be on a 8-bit scale; if
2224 * the palette data comes from an IBM VGA native format, the component
2225 * data is probably 6 bits in size and needs to be scaled. */
2226 unsigned int palette[AVPALETTE_COUNT];
2228 } AVPaletteControl attribute_deprecated;
2230 typedef struct AVSubtitleRect {
2237 uint32_t *rgba_palette;
2241 typedef struct AVSubtitle {
2242 uint16_t format; /* 0 = graphics */
2243 uint32_t start_display_time; /* relative to packet pts, in ms */
2244 uint32_t end_display_time; /* relative to packet pts, in ms */
2246 AVSubtitleRect *rects;
2252 struct ReSampleContext;
2253 struct AVResampleContext;
2255 typedef struct ReSampleContext ReSampleContext;
2257 ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2258 int output_rate, int input_rate);
2259 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2260 void audio_resample_close(ReSampleContext *s);
2262 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2263 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2264 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2265 void av_resample_close(struct AVResampleContext *c);
2267 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2268 /* YUV420 format is assumed ! */
2271 * @deprecated Use the software scaler (swscale) instead.
2273 typedef struct ImgReSampleContext ImgReSampleContext attribute_deprecated;
2276 * @deprecated Use the software scaler (swscale) instead.
2278 attribute_deprecated ImgReSampleContext *img_resample_init(int output_width, int output_height,
2279 int input_width, int input_height);
2282 * @deprecated Use the software scaler (swscale) instead.
2284 attribute_deprecated ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
2285 int iwidth, int iheight,
2286 int topBand, int bottomBand,
2287 int leftBand, int rightBand,
2288 int padtop, int padbottom,
2289 int padleft, int padright);
2292 * @deprecated Use the software scaler (swscale) instead.
2294 attribute_deprecated void img_resample(struct ImgReSampleContext *s,
2295 AVPicture *output, const AVPicture *input);
2298 * @deprecated Use the software scaler (swscale) instead.
2300 attribute_deprecated void img_resample_close(struct ImgReSampleContext *s);
2305 * Allocate memory for a picture. Call avpicture_free to free it.
2307 * @param picture the picture to be filled in
2308 * @param pix_fmt the format of the picture
2309 * @param width the width of the picture
2310 * @param height the height of the picture
2311 * @return zero if successful, a negative value if not
2313 int avpicture_alloc(AVPicture *picture, int pix_fmt, int width, int height);
2316 * Free a picture previously allocated by avpicture_alloc().
2318 * @param picture the AVPicture to be freed
2320 void avpicture_free(AVPicture *picture);
2323 * Fill in the AVPicture fields.
2324 * The fields of the given AVPicture are filled in by using the 'ptr' address
2325 * which points to the image data buffer. Depending on the specified picture
2326 * format, one or multiple image data pointers and line sizes will be set.
2327 * If a planar format is specified, several pointers will be set pointing to
2328 * the different picture planes and the line sizes of the different planes
2329 * will be stored in the lines_sizes array.
2331 * @param picture AVPicture whose fields are to be filled in
2332 * @param ptr Buffer which will contain or contains the actual image data
2333 * @param pix_fmt The format in which the picture data is stored.
2334 * @param width the width of the image in pixels
2335 * @param height the height of the image in pixels
2336 * @return size of the image data in bytes
2338 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2339 int pix_fmt, int width, int height);
2340 int avpicture_layout(const AVPicture* src, int pix_fmt, int width, int height,
2341 unsigned char *dest, int dest_size);
2344 * Calculate the size in bytes that a picture of the given width and height
2345 * would occupy if stored in the given picture format.
2347 * @param pix_fmt the given picture format
2348 * @param width the width of the image
2349 * @param height the height of the image
2350 * @return Image data size in bytes
2352 int avpicture_get_size(int pix_fmt, int width, int height);
2353 void avcodec_get_chroma_sub_sample(int pix_fmt, int *h_shift, int *v_shift);
2354 const char *avcodec_get_pix_fmt_name(int pix_fmt);
2355 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2356 enum PixelFormat avcodec_get_pix_fmt(const char* name);
2357 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);
2359 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
2360 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
2361 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
2362 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
2363 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
2364 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
2367 * Computes what kind of losses will occur when converting from one specific
2368 * pixel format to another.
2369 * When converting from one pixel format to another, information loss may occur.
2370 * For example, when converting from RGB24 to GRAY, the color information will
2371 * be lost. Similarly, other losses occur when converting from some formats to
2372 * other formats. These losses can involve loss of chroma, but also loss of
2373 * resolution, loss of color depth, loss due to the color space conversion, loss
2374 * of the alpha bits or loss due to color quantization.
2375 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
2376 * which will occur when converting from one pixel format to another.
2378 * @param[in] dst_pix_fmt destination pixel format
2379 * @param[in] src_pix_fmt source pixel format
2380 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2381 * @return Combination of flags informing you what kind of losses will occur.
2383 int avcodec_get_pix_fmt_loss(int dst_pix_fmt, int src_pix_fmt,
2387 * Finds the best pixel format to convert to given a certain source pixel
2388 * format. When converting from one pixel format to another, information loss
2389 * may occur. For example, when converting from RGB24 to GRAY, the color
2390 * information will be lost. Similarly, other losses occur when converting from
2391 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
2392 * the given pixel formats should be used to suffer the least amount of loss.
2393 * The pixel formats from which it chooses one, are determined by the
2394 * \p pix_fmt_mask parameter.
2397 * src_pix_fmt = PIX_FMT_YUV420P;
2398 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
2399 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
2402 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
2403 * @param[in] src_pix_fmt source pixel format
2404 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2405 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
2406 * @return The best pixel format to convert to or -1 if none was found.
2408 int avcodec_find_best_pix_fmt(int pix_fmt_mask, int src_pix_fmt,
2409 int has_alpha, int *loss_ptr);
2413 * Print in buf the string corresponding to the pixel format with
2414 * number pix_fmt, or an header if pix_fmt is negative.
2416 * @param[in] buf the buffer where to write the string
2417 * @param[in] buf_size the size of buf
2418 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
2419 * a negative value to print the corresponding header.
2420 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
2422 void avcodec_pix_fmt_string (char *buf, int buf_size, int pix_fmt);
2424 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
2425 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
2428 * Tell if an image really has transparent alpha values.
2429 * @return ored mask of FF_ALPHA_xxx constants
2431 int img_get_alpha_info(const AVPicture *src,
2432 int pix_fmt, int width, int height);
2434 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2436 * convert among pixel formats
2437 * @deprecated Use the software scaler (swscale) instead.
2439 attribute_deprecated int img_convert(AVPicture *dst, int dst_pix_fmt,
2440 const AVPicture *src, int pix_fmt,
2441 int width, int height);
2444 /* deinterlace a picture */
2445 /* deinterlace - if not supported return -1 */
2446 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
2447 int pix_fmt, int width, int height);
2449 /* external high level API */
2451 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2452 extern AVCodec *first_avcodec;
2454 AVCodec *av_codec_next(AVCodec *c);
2456 /* returns LIBAVCODEC_VERSION_INT constant */
2457 unsigned avcodec_version(void);
2458 /* returns LIBAVCODEC_BUILD constant */
2459 unsigned avcodec_build(void);
2462 * Initializes libavcodec.
2464 * @warning This function \e must be called before any other libavcodec
2467 void avcodec_init(void);
2469 void register_avcodec(AVCodec *format);
2472 * Finds a registered encoder with a matching codec ID.
2474 * @param id CodecID of the requested encoder
2475 * @return An encoder if one was found, NULL otherwise.
2477 AVCodec *avcodec_find_encoder(enum CodecID id);
2480 * Finds a registered encoder with the specified name.
2482 * @param name name of the requested encoder
2483 * @return An encoder if one was found, NULL otherwise.
2485 AVCodec *avcodec_find_encoder_by_name(const char *name);
2488 * Finds a registered decoder with a matching codec ID.
2490 * @param id CodecID of the requested decoder
2491 * @return A decoder if one was found, NULL otherwise.
2493 AVCodec *avcodec_find_decoder(enum CodecID id);
2496 * Finds a registered decoder with the specified name.
2498 * @param name name of the requested decoder
2499 * @return A decoder if one was found, NULL otherwise.
2501 AVCodec *avcodec_find_decoder_by_name(const char *name);
2502 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
2505 * Sets the fields of the given AVCodecContext to default values.
2507 * @param s The AVCodecContext of which the fields should be set to default values.
2509 void avcodec_get_context_defaults(AVCodecContext *s);
2511 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2512 * we WILL change its arguments and name a few times! */
2513 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
2516 * Allocates an AVCodecContext and sets its fields to default values. The
2517 * resulting struct can be deallocated by simply calling av_free().
2519 * @return An AVCodecContext filled with default values or NULL on failure.
2520 * @see avcodec_get_context_defaults
2522 AVCodecContext *avcodec_alloc_context(void);
2524 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2525 * we WILL change its arguments and name a few times! */
2526 AVCodecContext *avcodec_alloc_context2(enum CodecType);
2529 * Sets the fields of the given AVFrame to default values.
2531 * @param pic The AVFrame of which the fields should be set to default values.
2533 void avcodec_get_frame_defaults(AVFrame *pic);
2536 * Allocates an AVFrame and sets its fields to default values. The resulting
2537 * struct can be deallocated by simply calling av_free().
2539 * @return An AVFrame filled with default values or NULL on failure.
2540 * @see avcodec_get_frame_defaults
2542 AVFrame *avcodec_alloc_frame(void);
2544 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
2545 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
2546 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
2547 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
2550 * Checks if the given dimension of a picture is valid, meaning that all
2551 * bytes of the picture can be addressed with a signed int.
2553 * @param[in] w Width of the picture.
2554 * @param[in] h Height of the picture.
2555 * @return Zero if valid, a negative value if invalid.
2557 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
2558 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
2560 int avcodec_thread_init(AVCodecContext *s, int thread_count);
2561 void avcodec_thread_free(AVCodecContext *s);
2562 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2563 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2564 //FIXME func typedef
2567 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
2568 * function the context has to be allocated.
2570 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2571 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2572 * retrieving a codec.
2574 * @warning This function is not thread safe!
2577 * avcodec_register_all();
2578 * codec = avcodec_find_decoder(CODEC_ID_H264);
2582 * context = avcodec_alloc_context();
2584 * if (avcodec_open(context, codec) < 0)
2588 * @param avctx The context which will be set up to use the given codec.
2589 * @param codec The codec to use within the context.
2590 * @return zero on success, a negative value on error
2591 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
2593 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
2596 * @deprecated Use avcodec_decode_audio2() instead.
2598 attribute_deprecated int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
2599 int *frame_size_ptr,
2600 uint8_t *buf, int buf_size);
2603 * Decodes an audio frame from \p buf into \p samples.
2604 * The avcodec_decode_audio2() function decodes an audio frame from the input
2605 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2606 * audio codec which was coupled with \p avctx using avcodec_open(). The
2607 * resulting decoded frame is stored in output buffer \p samples. If no frame
2608 * could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
2609 * decompressed frame size in \e bytes.
2611 * @warning You \e must set \p frame_size_ptr to the allocated size of the
2612 * output buffer before calling avcodec_decode_audio2().
2614 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2615 * the actual read bytes because some optimized bitstream readers read 32 or 64
2616 * bits at once and could read over the end.
2618 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2619 * no overreading happens for damaged MPEG streams.
2621 * @note You might have to align the input buffer \p buf and output buffer \p
2622 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
2623 * necessary at all, on others it won't work at all if not aligned and on others
2624 * it will work but it will have an impact on performance. In practice, the
2625 * bitstream should have 4 byte alignment at minimum and all sample data should
2626 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2627 * the linesize is not a multiple of 16 then there's no sense in aligning the
2628 * start of the buffer to 16.
2630 * @param avctx the codec context
2631 * @param[out] samples the output buffer
2632 * @param[in,out] frame_size_ptr the output buffer size in bytes
2633 * @param[in] buf the input buffer
2634 * @param[in] buf_size the input buffer size in bytes
2635 * @return On error a negative value is returned, otherwise the number of bytes
2636 * used or zero if no frame could be decompressed.
2638 int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
2639 int *frame_size_ptr,
2640 uint8_t *buf, int buf_size);
2643 * Decodes a video frame from \p buf into \p picture.
2644 * The avcodec_decode_video() function decodes a video frame from the input
2645 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2646 * video codec which was coupled with \p avctx using avcodec_open(). The
2647 * resulting decoded frame is stored in \p picture.
2649 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2650 * the actual read bytes because some optimized bitstream readers read 32 or 64
2651 * bits at once and could read over the end.
2653 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2654 * no overreading happens for damaged MPEG streams.
2656 * @note You might have to align the input buffer \p buf and output buffer \p
2657 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
2658 * necessary at all, on others it won't work at all if not aligned and on others
2659 * it will work but it will have an impact on performance. In practice, the
2660 * bitstream should have 4 byte alignment at minimum and all sample data should
2661 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2662 * the linesize is not a multiple of 16 then there's no sense in aligning the
2663 * start of the buffer to 16.
2665 * @param avctx the codec context
2666 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
2667 * @param[in] buf the input buffer
2668 * @param[in] buf_size the size of the input buffer in bytes
2669 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
2670 * @return On error a negative value is returned, otherwise the number of bytes
2671 * used or zero if no frame could be decompressed.
2673 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
2674 int *got_picture_ptr,
2675 uint8_t *buf, int buf_size);
2677 /* Decode a subtitle message. Return -1 if error, otherwise return the
2678 * number of bytes used. If no subtitle could be decompressed,
2679 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
2680 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
2682 const uint8_t *buf, int buf_size);
2683 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
2685 uint8_t *buf, int buf_size);
2688 * Encodes an audio frame from \p samples into \p buf.
2689 * The avcodec_encode_audio() function encodes an audio frame from the input
2690 * buffer \p samples. To encode it, it makes use of the audio codec which was
2691 * coupled with \p avctx using avcodec_open(). The resulting encoded frame is
2692 * stored in output buffer \p buf.
2694 * @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
2696 * @param avctx the codec context
2697 * @param[out] buf the output buffer
2698 * @param[in] buf_size the output buffer size
2699 * @param[in] samples the input buffer containing the samples
2700 * The number of samples read from this buffer is frame_size*channels,
2701 * both of which are defined in \p avctx.
2702 * @return On error a negative value is returned, on success zero or the number
2703 * of bytes used to encode the data read from the input buffer.
2705 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2706 const short *samples);
2709 * Encodes a video frame from \p pict into \p buf.
2710 * The avcodec_encode_video() function encodes a video frame from the input
2711 * \p pict. To encode it, it makes use of the video codec which was coupled with
2712 * \p avctx using avcodec_open(). The resulting encoded bytes representing the
2713 * frame are stored in the output buffer \p buf. The input picture should be
2714 * stored using a specific format, namely \c avctx.pix_fmt.
2716 * @param avctx the codec context
2717 * @param[out] buf the output buffer for the bitstream of encoded frame
2718 * @param[in] buf_size the size of the output buffer in bytes
2719 * @param[in] pict the input picture to encode
2720 * @return On error a negative value is returned, on success zero or the number
2721 * of bytes used from the input buffer.
2723 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2724 const AVFrame *pict);
2725 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2726 const AVSubtitle *sub);
2728 int avcodec_close(AVCodecContext *avctx);
2730 void avcodec_register_all(void);
2733 * Flush buffers, should be called when seeking or when switching to a different stream.
2735 void avcodec_flush_buffers(AVCodecContext *avctx);
2737 void avcodec_default_free_buffers(AVCodecContext *s);
2739 /* misc useful functions */
2742 * Returns a single letter to describe the given picture type \p pict_type.
2744 * @param[in] pict_type the picture type
2745 * @return A single character representing the picture type.
2747 char av_get_pict_type_char(int pict_type);
2750 * Returns codec bits per sample.
2752 * @param[in] codec_id the codec
2753 * @return Number of bits per sample or zero if unknown for the given codec.
2755 int av_get_bits_per_sample(enum CodecID codec_id);
2758 * Returns sample format bits per sample.
2760 * @param[in] sample_fmt the sample format
2761 * @return Number of bits per sample or zero if unknown for the given sample format.
2763 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
2766 typedef struct AVCodecParserContext {
2768 struct AVCodecParser *parser;
2769 int64_t frame_offset; /* offset of the current frame */
2770 int64_t cur_offset; /* current offset
2771 (incremented by each av_parser_parse()) */
2772 int64_t last_frame_offset; /* offset of the last frame */
2774 int pict_type; /* XXX: Put it back in AVCodecContext. */
2775 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
2776 int64_t pts; /* pts of the current frame */
2777 int64_t dts; /* dts of the current frame */
2782 int fetch_timestamp;
2784 #define AV_PARSER_PTS_NB 4
2785 int cur_frame_start_index;
2786 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
2787 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
2788 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
2791 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
2793 int64_t offset; ///< byte offset from starting packet start
2794 int64_t last_offset;
2795 } AVCodecParserContext;
2797 typedef struct AVCodecParser {
2798 int codec_ids[5]; /* several codec IDs are permitted */
2800 int (*parser_init)(AVCodecParserContext *s);
2801 int (*parser_parse)(AVCodecParserContext *s,
2802 AVCodecContext *avctx,
2803 const uint8_t **poutbuf, int *poutbuf_size,
2804 const uint8_t *buf, int buf_size);
2805 void (*parser_close)(AVCodecParserContext *s);
2806 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
2807 struct AVCodecParser *next;
2810 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2811 extern AVCodecParser *av_first_parser;
2813 AVCodecParser *av_parser_next(AVCodecParser *c);
2815 void av_register_codec_parser(AVCodecParser *parser);
2816 AVCodecParserContext *av_parser_init(int codec_id);
2817 int av_parser_parse(AVCodecParserContext *s,
2818 AVCodecContext *avctx,
2819 uint8_t **poutbuf, int *poutbuf_size,
2820 const uint8_t *buf, int buf_size,
2821 int64_t pts, int64_t dts);
2822 int av_parser_change(AVCodecParserContext *s,
2823 AVCodecContext *avctx,
2824 uint8_t **poutbuf, int *poutbuf_size,
2825 const uint8_t *buf, int buf_size, int keyframe);
2826 void av_parser_close(AVCodecParserContext *s);
2829 typedef struct AVBitStreamFilterContext {
2831 struct AVBitStreamFilter *filter;
2832 AVCodecParserContext *parser;
2833 struct AVBitStreamFilterContext *next;
2834 } AVBitStreamFilterContext;
2837 typedef struct AVBitStreamFilter {
2840 int (*filter)(AVBitStreamFilterContext *bsfc,
2841 AVCodecContext *avctx, const char *args,
2842 uint8_t **poutbuf, int *poutbuf_size,
2843 const uint8_t *buf, int buf_size, int keyframe);
2844 void (*close)(AVBitStreamFilterContext *bsfc);
2845 struct AVBitStreamFilter *next;
2846 } AVBitStreamFilter;
2848 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
2849 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
2850 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
2851 AVCodecContext *avctx, const char *args,
2852 uint8_t **poutbuf, int *poutbuf_size,
2853 const uint8_t *buf, int buf_size, int keyframe);
2854 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
2856 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
2861 * Reallocates the given block if it is not large enough, otherwise it
2866 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
2868 /* for static data only */
2871 * Frees all static arrays and resets their pointers to 0.
2872 * Call this function to release all statically allocated tables.
2874 * @deprecated. Code which uses av_free_static is broken/misdesigned
2875 * and should correctly use static arrays
2878 attribute_deprecated void av_free_static(void);
2881 * Allocation of static arrays.
2883 * @warning Do not use for normal allocation.
2885 * @param[in] size The amount of memory you need in bytes.
2886 * @return block of memory of the requested size
2887 * @deprecated. Code which uses av_mallocz_static is broken/misdesigned
2888 * and should correctly use static arrays
2890 attribute_deprecated void *av_mallocz_static(unsigned int size);
2893 * Copy image 'src' to 'dst'.
2895 void av_picture_copy(AVPicture *dst, const AVPicture *src,
2896 int pix_fmt, int width, int height);
2899 * Crop image top and left side.
2901 int av_picture_crop(AVPicture *dst, const AVPicture *src,
2902 int pix_fmt, int top_band, int left_band);
2907 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
2908 int padtop, int padbottom, int padleft, int padright, int *color);
2910 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2912 * @deprecated Use the software scaler (swscale) instead.
2914 attribute_deprecated void img_copy(AVPicture *dst, const AVPicture *src,
2915 int pix_fmt, int width, int height);
2918 * @deprecated Use the software scaler (swscale) instead.
2920 attribute_deprecated int img_crop(AVPicture *dst, const AVPicture *src,
2921 int pix_fmt, int top_band, int left_band);
2924 * @deprecated Use the software scaler (swscale) instead.
2926 attribute_deprecated int img_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
2927 int padtop, int padbottom, int padleft, int padright, int *color);
2930 extern unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
2933 * Parses \p str and put in \p width_ptr and \p height_ptr the detected values.
2935 * @return 0 in case of a successful parsing, a negative value otherwise
2936 * @param[in] str the string to parse: it has to be a string in the format
2937 * <width>x<height> or a valid video frame size abbreviation.
2938 * @param[in,out] width_ptr pointer to the variable which will contain the detected
2940 * @param[in,out] height_ptr pointer to the variable which will contain the detected
2941 * frame height value
2943 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
2946 * Parses \p str and put in \p frame_rate the detected values.
2948 * @return 0 in case of a successful parsing, a negative value otherwise
2949 * @param[in] str the string to parse: it has to be a string in the format
2950 * <frame_rate_nom>/<frame_rate_den>, a float number or a valid video rate abbreviation
2951 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
2954 int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
2956 /* error handling */
2958 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
2959 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
2961 /* Some platforms have E* and errno already negated. */
2962 #define AVERROR(e) (e)
2963 #define AVUNERROR(e) (e)
2965 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
2966 #define AVERROR_IO AVERROR(EIO) /**< I/O error */
2967 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< Number syntax expected in filename. */
2968 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
2969 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
2970 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
2971 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< Operation not supported. */
2972 #define AVERROR_NOENT AVERROR(ENOENT) /**< No such file or directory. */
2973 #define AVERROR_PATCHWELCOME -MKTAG('P','A','W','E') /**< Not yet implemented in FFmpeg. Patches welcome. */
2975 #endif /* FFMPEG_AVCODEC_H */