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 St, Fifth Floor, Boston, MA 02110-1301 USA
35 #include <sys/types.h> /* size_t */
37 #define AV_STRINGIFY(s) AV_TOSTRING(s)
38 #define AV_TOSTRING(s) #s
40 #define LIBAVCODEC_VERSION_INT ((51<<16)+(40<<8)+4)
41 #define LIBAVCODEC_VERSION 51.40.4
42 #define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
44 #define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
46 #define AV_NOPTS_VALUE INT64_C(0x8000000000000000)
47 #define AV_TIME_BASE 1000000
48 #define AV_TIME_BASE_Q (AVRational){1, AV_TIME_BASE}
52 * If you add a codec ID to this list, add it so that
53 * 1. no value of a existing codec ID changes (that would break ABI),
54 * 2. it is as close as possible to similar codecs.
59 CODEC_ID_MPEG2VIDEO, /* preferred ID for MPEG-1/2 video decoding */
60 CODEC_ID_MPEG2VIDEO_XVMC,
97 CODEC_ID_INTERPLAY_VIDEO,
109 CODEC_ID_TRUEMOTION1,
137 CODEC_ID_TRUEMOTION2,
154 CODEC_ID_DSICINVIDEO,
155 CODEC_ID_TIERTEXSEQVIDEO,
164 CODEC_ID_BETHSOFTVID,
166 /* various PCM "codecs" */
167 CODEC_ID_PCM_S16LE= 0x10000,
183 CODEC_ID_PCM_S24DAUD,
185 /* various ADPCM codecs */
186 CODEC_ID_ADPCM_IMA_QT= 0x11000,
187 CODEC_ID_ADPCM_IMA_WAV,
188 CODEC_ID_ADPCM_IMA_DK3,
189 CODEC_ID_ADPCM_IMA_DK4,
190 CODEC_ID_ADPCM_IMA_WS,
191 CODEC_ID_ADPCM_IMA_SMJPEG,
200 CODEC_ID_ADPCM_YAMAHA,
201 CODEC_ID_ADPCM_SBPRO_4,
202 CODEC_ID_ADPCM_SBPRO_3,
203 CODEC_ID_ADPCM_SBPRO_2,
207 CODEC_ID_AMR_NB= 0x12000,
210 /* RealAudio codecs*/
211 CODEC_ID_RA_144= 0x13000,
214 /* various DPCM codecs */
215 CODEC_ID_ROQ_DPCM= 0x14000,
216 CODEC_ID_INTERPLAY_DPCM,
220 CODEC_ID_MP2= 0x15000,
221 CODEC_ID_MP3, /* preferred ID for decoding MPEG audio layer 1, 2 or 3 */
223 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
242 CODEC_ID_WESTWOOD_SND1,
243 CODEC_ID_GSM, /* as in Berlin toast format */
251 CODEC_ID_DSICINAUDIO,
255 CODEC_ID_GSM_MS, /* as found in WAV */
258 /* subtitle codecs */
259 CODEC_ID_DVD_SUBTITLE= 0x17000,
260 CODEC_ID_DVB_SUBTITLE,
262 CODEC_ID_MPEG2TS= 0x20000, /* _FAKE_ codec to indicate a raw MPEG-2 TS
263 * stream (only used by libavformat) */
266 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
267 /* CODEC_ID_MP3LAME is obsolete */
268 #define CODEC_ID_MP3LAME CODEC_ID_MP3
269 #define CODEC_ID_MPEG4AAC CODEC_ID_AAC
273 CODEC_TYPE_UNKNOWN = -1,
281 /* Currently unused, may be used if 24/32 bits samples are ever supported. */
282 /* all in native-endian format */
284 SAMPLE_FMT_NONE = -1,
285 SAMPLE_FMT_U8, ///< unsigned 8 bits
286 SAMPLE_FMT_S16, ///< signed 16 bits
287 SAMPLE_FMT_S24, ///< signed 24 bits
288 SAMPLE_FMT_S32, ///< signed 32 bits
289 SAMPLE_FMT_FLT, ///< float
293 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
296 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
297 * This is mainly needed because some optimized bitstream readers read
298 * 32 or 64 bit at once and could read over the end.<br>
299 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
300 * MPEG bitstreams could cause overread and segfault.
302 #define FF_INPUT_BUFFER_PADDING_SIZE 8
305 * minimum encoding buffer size
306 * Used to avoid some checks during header writing.
308 #define FF_MIN_BUFFER_SIZE 16384
310 /* motion estimation type, EPZS by default */
324 /* We leave some space between them for extensions (drop some
325 * keyframes for intra-only or drop just some bidir frames). */
326 AVDISCARD_NONE =-16, ///< discard nothing
327 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
328 AVDISCARD_NONREF = 8, ///< discard all non reference
329 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
330 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
331 AVDISCARD_ALL = 48, ///< discard all
334 typedef struct RcOverride{
337 int qscale; // If this is 0 then quality_factor will be used instead.
338 float quality_factor;
341 #define FF_MAX_B_FRAMES 16
344 These flags can be passed in AVCodecContext.flags before initialization.
345 Note: Not everything is supported yet.
348 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
349 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
350 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
351 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
352 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
353 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
354 /* The parent program guarantees that the input for B-frames containing
355 * streams is not written to for at least s->max_b_frames+1 frames, if
356 * this is not set the input will be copied. */
357 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
358 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
359 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
360 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
361 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
362 #define CODEC_FLAG_EMU_EDGE 0x4000///< Don't draw edges.
363 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
364 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random location instead
365 of only at frame boundaries. */
366 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
367 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
368 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
369 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
370 #define CODEC_FLAG_TRELLIS_QUANT 0x00200000 ///< Use trellis quantization.
371 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
372 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
373 /* Fx : Flag for h263+ extra options */
374 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
375 #define CODEC_FLAG_H263P_AIC 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction (remove this)
377 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
378 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
379 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
380 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
381 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
382 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
383 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
384 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
385 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
386 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
387 #define CODEC_FLAG_CLOSED_GOP ((int)0x80000000)
388 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
389 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
390 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
391 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
392 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
393 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
394 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
395 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
396 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
397 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
398 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
399 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
400 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
401 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
402 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
403 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
404 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
406 /* Unsupported options :
407 * Syntax Arithmetic coding (SAC)
408 * Reference Picture Selection
409 * Independent Segment Decoding */
411 /* codec capabilities */
413 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
415 * Codec uses get_buffer() for allocating buffers.
416 * direct rendering method 1
418 #define CODEC_CAP_DR1 0x0002
419 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
420 #define CODEC_CAP_PARSE_ONLY 0x0004
421 #define CODEC_CAP_TRUNCATED 0x0008
422 /* Codec can export data for HW decoding (XvMC). */
423 #define CODEC_CAP_HWACCEL 0x0010
425 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
426 * If this is not set, the codec is guaranteed to never be fed with NULL data.
428 #define CODEC_CAP_DELAY 0x0020
430 * Codec can be fed a final frame with a smaller size.
431 * This can be used to prevent truncation of the last audio samples.
433 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
435 //The following defines may change, don't expect compatibility if you use them.
436 #define MB_TYPE_INTRA4x4 0x0001
437 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
438 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
439 #define MB_TYPE_16x16 0x0008
440 #define MB_TYPE_16x8 0x0010
441 #define MB_TYPE_8x16 0x0020
442 #define MB_TYPE_8x8 0x0040
443 #define MB_TYPE_INTERLACED 0x0080
444 #define MB_TYPE_DIRECT2 0x0100 //FIXME
445 #define MB_TYPE_ACPRED 0x0200
446 #define MB_TYPE_GMC 0x0400
447 #define MB_TYPE_SKIP 0x0800
448 #define MB_TYPE_P0L0 0x1000
449 #define MB_TYPE_P1L0 0x2000
450 #define MB_TYPE_P0L1 0x4000
451 #define MB_TYPE_P1L1 0x8000
452 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
453 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
454 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
455 #define MB_TYPE_QUANT 0x00010000
456 #define MB_TYPE_CBP 0x00020000
457 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
461 * This specifies the area which should be displayed.
462 * Note there may be multiple such areas for one frame.
464 typedef struct AVPanScan{
467 * - encoding: Set by user.
468 * - decoding: Set by libavcodec.
473 * width and height in 1/16 pel
474 * - encoding: Set by user.
475 * - decoding: Set by libavcodec.
481 * position of the top left corner in 1/16 pel for up to 3 fields/frames
482 * - encoding: Set by user.
483 * - decoding: Set by libavcodec.
485 int16_t position[3][2];
488 #define FF_COMMON_FRAME \
490 * pointer to the picture planes.\
491 * This might be different from the first allocated byte\
498 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
499 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
505 * 1 -> keyframe, 0-> not\
506 * - encoding: Set by libavcodec.\
507 * - decoding: Set by libavcodec.\
512 * Picture type of the frame, see ?_TYPE below.\
513 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
514 * - decoding: Set by libavcodec.\
519 * presentation timestamp in time_base units (time when frame should be shown to user)\
520 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
521 * - encoding: MUST be set by user.\
522 * - decoding: Set by libavcodec.\
527 * picture number in bitstream order\
528 * - encoding: set by\
529 * - decoding: Set by libavcodec.\
531 int coded_picture_number;\
533 * picture number in display order\
534 * - encoding: set by\
535 * - decoding: Set by libavcodec.\
537 int display_picture_number;\
540 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
541 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
542 * - decoding: Set by libavcodec.\
547 * buffer age (1->was last buffer and dint change, 2->..., ...).\
548 * Set to INT_MAX if the buffer has not been used yet.\
549 * - encoding: unused\
550 * - decoding: MUST be set by get_buffer().\
555 * is this picture used as reference\
556 * - encoding: unused\
557 * - decoding: Set by libavcodec. (before get_buffer() call)).\
563 * - encoding: unused\
564 * - decoding: Set by libavcodec.\
566 int8_t *qscale_table;\
569 * - encoding: unused\
570 * - decoding: Set by libavcodec.\
575 * mbskip_table[mb]>=1 if MB didn't change\
576 * stride= mb_width = (width+15)>>4\
577 * - encoding: unused\
578 * - decoding: Set by libavcodec.\
580 uint8_t *mbskip_table;\
583 * motion vector table\
586 * int mv_sample_log2= 4 - motion_subsample_log2;\
587 * int mb_width= (width+15)>>4;\
588 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
589 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
591 * - encoding: Set by user.\
592 * - decoding: Set by libavcodec.\
594 int16_t (*motion_val[2])[2];\
597 * macroblock type table\
598 * mb_type_base + mb_width + 2\
599 * - encoding: Set by user.\
600 * - decoding: Set by libavcodec.\
605 * log2 of the size of the block which a single vector in motion_val represents: \
606 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
607 * - encoding: unused\
608 * - decoding: Set by libavcodec.\
610 uint8_t motion_subsample_log2;\
613 * for some private data of the user\
614 * - encoding: unused\
615 * - decoding: Set by user.\
621 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
622 * - decoding: unused\
627 * type of the buffer (to keep track of who has to deallocate data[*])\
628 * - encoding: Set by the one who allocates it.\
629 * - decoding: Set by the one who allocates it.\
630 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
635 * When decoding, this signals how much the picture must be delayed.\
636 * extra_delay = repeat_pict / (2*fps)\
637 * - encoding: unused\
638 * - decoding: Set by libavcodec.\
648 * The content of the picture is interlaced.\
649 * - encoding: Set by user.\
650 * - decoding: Set by libavcodec. (default 0)\
652 int interlaced_frame;\
655 * If the content is interlaced, is top field displayed first.\
656 * - encoding: Set by user.\
657 * - decoding: Set by libavcodec.\
659 int top_field_first;\
663 * - encoding: Set by user.\
664 * - decoding: Set by libavcodec.\
666 AVPanScan *pan_scan;\
669 * Tell user application that palette has changed from previous frame.\
670 * - encoding: ??? (no palette-enabled encoder yet)\
671 * - decoding: Set by libavcodec. (default 0).\
673 int palette_has_changed;\
676 * codec suggestion on buffer type if != 0\
677 * - encoding: unused\
678 * - decoding: Set by libavcodec. (before get_buffer() call)).\
684 * - encoding: unused\
685 * - decoding: Set by libavcodec.\
690 * motion referece frame index\
691 * - encoding: Set by user.\
692 * - decoding: Set by libavcodec.\
694 int8_t *ref_index[2];
696 #define FF_QSCALE_TYPE_MPEG1 0
697 #define FF_QSCALE_TYPE_MPEG2 1
698 #define FF_QSCALE_TYPE_H264 2
700 #define FF_BUFFER_TYPE_INTERNAL 1
701 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
702 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
703 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
706 #define FF_I_TYPE 1 // Intra
707 #define FF_P_TYPE 2 // Predicted
708 #define FF_B_TYPE 3 // Bi-dir predicted
709 #define FF_S_TYPE 4 // S(GMC)-VOP MPEG4
713 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
714 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
715 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
716 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
721 typedef struct AVFrame {
725 #define DEFAULT_FRAME_RATE_BASE 1001000
728 * main external API structure
730 typedef struct AVCodecContext {
732 * information on struct for av_log
733 * - set by avcodec_alloc_context
737 * the average bitrate
738 * - encoding: Set by user; unused for constant quantizer encoding.
739 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
744 * number of bits the bitstream is allowed to diverge from the reference.
745 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
746 * - encoding: Set by user; unused for constant quantizer encoding.
749 int bit_rate_tolerance;
753 * - encoding: Set by user.
754 * - decoding: Set by user.
759 * Some codecs need additional format info. It is stored here.
760 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
761 * specific codec MUST set it correctly otherwise stream copy breaks.
762 * In general use of this field by muxers is not recommanded.
763 * - encoding: Set by libavcodec.
764 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
769 * Motion estimation algorithm used for video coding.
770 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
771 * 8 (umh), 9 (iter) [7, 8 are x264 specific, 9 is snow specific]
772 * - encoding: MUST be set by user.
778 * some codecs need / can use extradata like Huffman tables.
779 * mjpeg: Huffman tables
780 * rv10: additional flags
781 * mpeg4: global headers (they can be in the bitstream or here)
782 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
783 * than extradata_size to avoid prolems if it is read with the bitstream reader.
784 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
785 * - encoding: Set/allocated/freed by libavcodec.
786 * - decoding: Set/allocated/freed by user.
792 * This is the fundamental unit of time (in seconds) in terms
793 * of which frame timestamps are represented. For fixed-fps content,
794 * timebase should be 1/framerate and timestamp increments should be
796 * - encoding: MUST be set by user.
797 * - decoding: Set by libavcodec.
799 AVRational time_base;
803 * picture width / height.
804 * - encoding: MUST be set by user.
805 * - decoding: Set by libavcodec.
806 * Note: For compatibility it is possible to set this instead of
807 * coded_width/height before decoding.
811 #define FF_ASPECT_EXTENDED 15
814 * the number of pictures in a group of pictures, or 0 for intra_only
815 * - encoding: Set by user.
821 * Pixel format, see PIX_FMT_xxx.
822 * - encoding: Set by user.
823 * - decoding: Set by libavcodec.
825 enum PixelFormat pix_fmt;
828 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
829 * has to read frames at native frame rate.
830 * - encoding: Set by user.
836 * If non NULL, 'draw_horiz_band' is called by the libavcodec
837 * decoder to draw a horizontal band. It improves cache usage. Not
838 * all codecs can do that. You must check the codec capabilities
841 * - decoding: Set by user.
842 * @param height the height of the slice
843 * @param y the y position of the slice
844 * @param type 1->top field, 2->bottom field, 3->frame
845 * @param offset offset into the AVFrame.data from which the slice should be read
847 void (*draw_horiz_band)(struct AVCodecContext *s,
848 const AVFrame *src, int offset[4],
849 int y, int type, int height);
852 int sample_rate; ///< samples per second
856 * audio sample format
857 * - encoding: Set by user.
858 * - decoding: Set by libavcodec.
860 enum SampleFormat sample_fmt; ///< sample format, currently unused
862 /* The following data should not be initialized. */
864 * Samples per packet, initialized when calling 'init'.
867 int frame_number; ///< audio or video frame number
868 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
871 * Number of frames the decoded output will be delayed relative to
873 * - encoding: Set by libavcodec.
878 /* - encoding parameters */
879 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
880 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
884 * - encoding: Set by user.
891 * - encoding: Set by user.
897 * maximum quantizer difference between frames
898 * - encoding: Set by user.
904 * maximum number of B-frames between non-B-frames
905 * Note: The output will be delayed by max_b_frames+1 relative to the input.
906 * - encoding: Set by user.
912 * qscale factor between IP and B-frames
913 * - encoding: Set by user.
916 float b_quant_factor;
918 /** obsolete FIXME remove */
920 #define FF_RC_STRATEGY_XVID 1
922 int b_frame_strategy;
927 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
928 * @deprecated Deprecated in favor of skip_idct and skip_frame.
932 struct AVCodec *codec;
936 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
937 /* unused, FIXME remove*/
941 int rtp_payload_size; /* The size of the RTP payload: the coder will */
942 /* do its best to deliver a chunk with size */
943 /* below rtp_payload_size, the chunk will start */
944 /* with a start code on some codecs like H.263. */
945 /* This doesn't take account of any particular */
946 /* headers inside the transmitted RTP payload. */
949 /* The RTP callback: This function is called */
950 /* every time the encoder has a packet to send. */
951 /* It depends on the encoder if the data starts */
952 /* with a Start Code (it should). H.263 does. */
953 /* mb_nb contains the number of macroblocks */
954 /* encoded in the RTP payload. */
955 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
957 /* statistics, used for 2-pass encoding */
968 * number of bits used for the previously encoded frame
969 * - encoding: Set by libavcodec.
975 * Private data of the user, can be used to carry app specific stuff.
976 * - encoding: Set by user.
977 * - decoding: Set by user.
982 enum CodecType codec_type; /* see CODEC_TYPE_xxx */
983 enum CodecID codec_id; /* see CODEC_ID_xxx */
986 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
987 * This is used to work around some encoder bugs.
988 * A demuxer should set this to what is stored in the field used to identify the codec.
989 * If there are multiple such fields in a container then the demuxer should choose the one
990 * which maximizes the information about the used codec.
991 * If the codec tag field in a container is larger then 32 bits then the demuxer should
992 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
993 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
995 * - encoding: Set by user, if not then the default based on codec_id will be used.
996 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
998 unsigned int codec_tag;
1001 * Work around bugs in encoders which sometimes cannot be detected automatically.
1002 * - encoding: Set by user
1003 * - decoding: Set by user
1005 int workaround_bugs;
1006 #define FF_BUG_AUTODETECT 1 ///< autodetection
1007 #define FF_BUG_OLD_MSMPEG4 2
1008 #define FF_BUG_XVID_ILACE 4
1009 #define FF_BUG_UMP4 8
1010 #define FF_BUG_NO_PADDING 16
1011 #define FF_BUG_AMV 32
1012 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1013 #define FF_BUG_QPEL_CHROMA 64
1014 #define FF_BUG_STD_QPEL 128
1015 #define FF_BUG_QPEL_CHROMA2 256
1016 #define FF_BUG_DIRECT_BLOCKSIZE 512
1017 #define FF_BUG_EDGE 1024
1018 #define FF_BUG_HPEL_CHROMA 2048
1019 #define FF_BUG_DC_CLIP 4096
1020 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1021 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1024 * luma single coefficient elimination threshold
1025 * - encoding: Set by user.
1026 * - decoding: unused
1028 int luma_elim_threshold;
1031 * chroma single coeff elimination threshold
1032 * - encoding: Set by user.
1033 * - decoding: unused
1035 int chroma_elim_threshold;
1038 * strictly follow the standard (MPEG4, ...).
1039 * - encoding: Set by user.
1040 * - decoding: unused
1042 int strict_std_compliance;
1043 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1044 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1045 #define FF_COMPLIANCE_NORMAL 0
1046 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1047 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1050 * qscale offset between IP and B-frames
1051 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1052 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1053 * - encoding: Set by user.
1054 * - decoding: unused
1056 float b_quant_offset;
1059 * Error resilience; higher values will detect more errors but may
1060 * misdetect some more or less valid parts as errors.
1061 * - encoding: unused
1062 * - decoding: Set by user.
1064 int error_resilience;
1065 #define FF_ER_CAREFUL 1
1066 #define FF_ER_COMPLIANT 2
1067 #define FF_ER_AGGRESSIVE 3
1068 #define FF_ER_VERY_AGGRESSIVE 4
1071 * Called at the beginning of each frame to get a buffer for it.
1072 * If pic.reference is set then the frame will be read later by libavcodec.
1073 * avcodec_align_dimensions() should be used to find the required width and
1074 * height, as they normally need to be rounded up to the next multiple of 16.
1075 * - encoding: unused
1076 * - decoding: Set by libavcodec., user can override.
1078 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1081 * Called to release buffers which where allocated with get_buffer.
1082 * A released buffer can be reused in get_buffer().
1083 * pic.data[*] must be set to NULL.
1084 * - encoding: unused
1085 * - decoding: Set by libavcodec., user can override.
1087 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1090 * If 1 the stream has a 1 frame delay during decoding.
1091 * - encoding: Set by libavcodec.
1092 * - decoding: Set by libavcodec.
1097 * number of bytes per packet if constant and known or 0
1098 * Used by some WAV based audio codecs.
1102 int parse_only; /* - decoding only: If true, only parsing is done
1103 (function avcodec_parse_frame()). The frame
1104 data is returned. Only MPEG codecs support this now. */
1107 * 0-> h263 quant 1-> mpeg quant
1108 * - encoding: Set by user.
1109 * - decoding: unused
1114 * pass1 encoding statistics output buffer
1115 * - encoding: Set by libavcodec.
1116 * - decoding: unused
1121 * pass2 encoding statistics input buffer
1122 * Concatenated stuff from stats_out of pass1 should be placed here.
1123 * - encoding: Allocated/set/freed by user.
1124 * - decoding: unused
1129 * ratecontrol qmin qmax limiting method
1130 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1131 * - encoding: Set by user.
1132 * - decoding: unused
1140 * ratecontrol override, see RcOverride
1141 * - encoding: Allocated/set/freed by user.
1142 * - decoding: unused
1144 RcOverride *rc_override;
1145 int rc_override_count;
1148 * rate control equation
1149 * - encoding: Set by user
1150 * - decoding: unused
1156 * - encoding: Set by user.
1157 * - decoding: unused
1163 * - encoding: Set by user.
1164 * - decoding: unused
1169 * decoder bitstream buffer size
1170 * - encoding: Set by user.
1171 * - decoding: unused
1174 float rc_buffer_aggressivity;
1177 * qscale factor between P and I-frames
1178 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1179 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1180 * - encoding: Set by user.
1181 * - decoding: unused
1183 float i_quant_factor;
1186 * qscale offset between P and I-frames
1187 * - encoding: Set by user.
1188 * - decoding: unused
1190 float i_quant_offset;
1193 * initial complexity for pass1 ratecontrol
1194 * - encoding: Set by user.
1195 * - decoding: unused
1197 float rc_initial_cplx;
1200 * DCT algorithm, see FF_DCT_* below
1201 * - encoding: Set by user.
1202 * - decoding: unused
1205 #define FF_DCT_AUTO 0
1206 #define FF_DCT_FASTINT 1
1207 #define FF_DCT_INT 2
1208 #define FF_DCT_MMX 3
1209 #define FF_DCT_MLIB 4
1210 #define FF_DCT_ALTIVEC 5
1211 #define FF_DCT_FAAN 6
1214 * luminance masking (0-> disabled)
1215 * - encoding: Set by user.
1216 * - decoding: unused
1221 * temporary complexity masking (0-> disabled)
1222 * - encoding: Set by user.
1223 * - decoding: unused
1225 float temporal_cplx_masking;
1228 * spatial complexity masking (0-> disabled)
1229 * - encoding: Set by user.
1230 * - decoding: unused
1232 float spatial_cplx_masking;
1235 * p block masking (0-> disabled)
1236 * - encoding: Set by user.
1237 * - decoding: unused
1242 * darkness masking (0-> disabled)
1243 * - encoding: Set by user.
1244 * - decoding: unused
1249 /* for binary compatibility */
1253 * IDCT algorithm, see FF_IDCT_* below.
1254 * - encoding: Set by user.
1255 * - decoding: Set by user.
1258 #define FF_IDCT_AUTO 0
1259 #define FF_IDCT_INT 1
1260 #define FF_IDCT_SIMPLE 2
1261 #define FF_IDCT_SIMPLEMMX 3
1262 #define FF_IDCT_LIBMPEG2MMX 4
1263 #define FF_IDCT_PS2 5
1264 #define FF_IDCT_MLIB 6
1265 #define FF_IDCT_ARM 7
1266 #define FF_IDCT_ALTIVEC 8
1267 #define FF_IDCT_SH4 9
1268 #define FF_IDCT_SIMPLEARM 10
1269 #define FF_IDCT_H264 11
1270 #define FF_IDCT_VP3 12
1271 #define FF_IDCT_IPP 13
1272 #define FF_IDCT_XVIDMMX 14
1273 #define FF_IDCT_CAVS 15
1274 #define FF_IDCT_SIMPLEARMV5TE 16
1275 #define FF_IDCT_SIMPLEARMV6 17
1279 * - encoding: Set by libavcodec.
1280 * - decoding: Set by user (or 0).
1284 * slice offsets in the frame in bytes
1285 * - encoding: Set/allocated by libavcodec.
1286 * - decoding: Set/allocated by user (or NULL).
1291 * error concealment flags
1292 * - encoding: unused
1293 * - decoding: Set by user.
1295 int error_concealment;
1296 #define FF_EC_GUESS_MVS 1
1297 #define FF_EC_DEBLOCK 2
1300 * dsp_mask could be add used to disable unwanted CPU features
1301 * CPU features (i.e. MMX, SSE. ...)
1303 * With the FORCE flag you may instead enable given CPU features.
1304 * (Dangerous: Usable in case of misdetection, improper usage however will
1305 * result into program crash.)
1308 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1309 /* lower 16 bits - CPU features */
1311 #define FF_MM_MMX 0x0001 /* standard MMX */
1312 #define FF_MM_3DNOW 0x0004 /* AMD 3DNOW */
1313 #define FF_MM_MMXEXT 0x0002 /* SSE integer functions or AMD MMX ext */
1314 #define FF_MM_SSE 0x0008 /* SSE functions */
1315 #define FF_MM_SSE2 0x0010 /* PIV SSE2 functions */
1316 #define FF_MM_3DNOWEXT 0x0020 /* AMD 3DNowExt */
1317 #endif /* HAVE_MMX */
1319 #define FF_MM_IWMMXT 0x0100 /* XScale IWMMXT */
1320 #endif /* HAVE_IWMMXT */
1323 * bits per sample/pixel from the demuxer (needed for huffyuv).
1324 * - encoding: Set by libavcodec.
1325 * - decoding: Set by user.
1327 int bits_per_sample;
1330 * prediction method (needed for huffyuv)
1331 * - encoding: Set by user.
1332 * - decoding: unused
1334 int prediction_method;
1335 #define FF_PRED_LEFT 0
1336 #define FF_PRED_PLANE 1
1337 #define FF_PRED_MEDIAN 2
1340 * sample aspect ratio (0 if unknown)
1341 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1342 * - encoding: Set by user.
1343 * - decoding: Set by libavcodec.
1345 AVRational sample_aspect_ratio;
1348 * the picture in the bitstream
1349 * - encoding: Set by libavcodec.
1350 * - decoding: Set by libavcodec.
1352 AVFrame *coded_frame;
1356 * - encoding: Set by user.
1357 * - decoding: Set by user.
1360 #define FF_DEBUG_PICT_INFO 1
1361 #define FF_DEBUG_RC 2
1362 #define FF_DEBUG_BITSTREAM 4
1363 #define FF_DEBUG_MB_TYPE 8
1364 #define FF_DEBUG_QP 16
1365 #define FF_DEBUG_MV 32
1366 #define FF_DEBUG_DCT_COEFF 0x00000040
1367 #define FF_DEBUG_SKIP 0x00000080
1368 #define FF_DEBUG_STARTCODE 0x00000100
1369 #define FF_DEBUG_PTS 0x00000200
1370 #define FF_DEBUG_ER 0x00000400
1371 #define FF_DEBUG_MMCO 0x00000800
1372 #define FF_DEBUG_BUGS 0x00001000
1373 #define FF_DEBUG_VIS_QP 0x00002000
1374 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1378 * - encoding: Set by user.
1379 * - decoding: Set by user.
1382 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1383 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1384 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1388 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1389 * - decoding: unused
1394 * minimum MB quantizer
1395 * - encoding: unused
1396 * - decoding: unused
1401 * maximum MB quantizer
1402 * - encoding: unused
1403 * - decoding: unused
1408 * motion estimation comparison function
1409 * - encoding: Set by user.
1410 * - decoding: unused
1414 * subpixel motion estimation comparison function
1415 * - encoding: Set by user.
1416 * - decoding: unused
1420 * macroblock comparison function (not supported yet)
1421 * - encoding: Set by user.
1422 * - decoding: unused
1426 * interlaced DCT comparison function
1427 * - encoding: Set by user.
1428 * - decoding: unused
1431 #define FF_CMP_SAD 0
1432 #define FF_CMP_SSE 1
1433 #define FF_CMP_SATD 2
1434 #define FF_CMP_DCT 3
1435 #define FF_CMP_PSNR 4
1436 #define FF_CMP_BIT 5
1438 #define FF_CMP_ZERO 7
1439 #define FF_CMP_VSAD 8
1440 #define FF_CMP_VSSE 9
1441 #define FF_CMP_NSSE 10
1442 #define FF_CMP_W53 11
1443 #define FF_CMP_W97 12
1444 #define FF_CMP_DCTMAX 13
1445 #define FF_CMP_DCT264 14
1446 #define FF_CMP_CHROMA 256
1449 * ME diamond size & shape
1450 * - encoding: Set by user.
1451 * - decoding: unused
1456 * amount of previous MV predictors (2a+1 x 2a+1 square)
1457 * - encoding: Set by user.
1458 * - decoding: unused
1460 int last_predictor_count;
1463 * prepass for motion estimation
1464 * - encoding: Set by user.
1465 * - decoding: unused
1470 * motion estimation prepass comparison function
1471 * - encoding: Set by user.
1472 * - decoding: unused
1477 * ME prepass diamond size & shape
1478 * - encoding: Set by user.
1479 * - decoding: unused
1485 * - encoding: Set by user.
1486 * - decoding: unused
1488 int me_subpel_quality;
1491 * callback to negotiate the pixelFormat
1492 * @param fmt is the list of formats which are supported by the codec,
1493 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1494 * The first is always the native one.
1495 * @return the chosen format
1496 * - encoding: unused
1497 * - decoding: Set by user, if not set the native format will be chosen.
1499 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1502 * DTG active format information (additional aspect ratio
1503 * information only used in DVB MPEG-2 transport streams)
1506 * - encoding: unused
1507 * - decoding: Set by decoder.
1509 int dtg_active_format;
1510 #define FF_DTG_AFD_SAME 8
1511 #define FF_DTG_AFD_4_3 9
1512 #define FF_DTG_AFD_16_9 10
1513 #define FF_DTG_AFD_14_9 11
1514 #define FF_DTG_AFD_4_3_SP_14_9 13
1515 #define FF_DTG_AFD_16_9_SP_14_9 14
1516 #define FF_DTG_AFD_SP_4_3 15
1519 * maximum motion estimation search range in subpel units
1520 * If 0 then no limit.
1522 * - encoding: Set by user.
1523 * - decoding: unused
1528 * intra quantizer bias
1529 * - encoding: Set by user.
1530 * - decoding: unused
1532 int intra_quant_bias;
1533 #define FF_DEFAULT_QUANT_BIAS 999999
1536 * inter quantizer bias
1537 * - encoding: Set by user.
1538 * - decoding: unused
1540 int inter_quant_bias;
1544 * - encoding: unused
1545 * - decoding: Which clrtable should be used for 8bit RGB images.
1546 * Tables have to be stored somewhere. FIXME
1551 * internal_buffer count
1552 * Don't touch, used by libavcodec default_get_buffer().
1554 int internal_buffer_count;
1558 * Don't touch, used by libavcodec default_get_buffer().
1560 void *internal_buffer;
1562 #define FF_LAMBDA_SHIFT 7
1563 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1564 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1565 #define FF_LAMBDA_MAX (256*128-1)
1567 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1569 * Global quality for codecs which cannot change it per frame.
1570 * This should be proportional to MPEG-1/2/4 qscale.
1571 * - encoding: Set by user.
1572 * - decoding: unused
1576 #define FF_CODER_TYPE_VLC 0
1577 #define FF_CODER_TYPE_AC 1
1578 #define FF_CODER_TYPE_RAW 2
1579 #define FF_CODER_TYPE_RLE 3
1580 #define FF_CODER_TYPE_DEFLATE 4
1583 * - encoding: Set by user.
1584 * - decoding: unused
1590 * - encoding: Set by user.
1591 * - decoding: unused
1597 * - encoding: unused
1598 * - decoding: Set by user.
1600 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1605 * - encoding: unused
1606 * - decoding: Set by user.
1609 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1610 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1611 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1614 * XVideo Motion Acceleration
1615 * - encoding: forbidden
1616 * - decoding: set by decoder
1618 int xvmc_acceleration;
1621 * macroblock decision mode
1622 * - encoding: Set by user.
1623 * - decoding: unused
1626 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1627 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1628 #define FF_MB_DECISION_RD 2 ///< rate distoration
1631 * custom intra quantization matrix
1632 * - encoding: Set by user, can be NULL.
1633 * - decoding: Set by libavcodec.
1635 uint16_t *intra_matrix;
1638 * custom inter quantization matrix
1639 * - encoding: Set by user, can be NULL.
1640 * - decoding: Set by libavcodec.
1642 uint16_t *inter_matrix;
1645 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1646 * This is used to work around some encoder bugs.
1647 * - encoding: unused
1648 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1650 unsigned int stream_codec_tag;
1653 * scene change detection threshold
1654 * 0 is default, larger means fewer detected scene changes.
1655 * - encoding: Set by user.
1656 * - decoding: unused
1658 int scenechange_threshold;
1661 * minimum Lagrange multipler
1662 * - encoding: Set by user.
1663 * - decoding: unused
1668 * maximum Lagrange multipler
1669 * - encoding: Set by user.
1670 * - decoding: unused
1675 * palette control structure
1676 * - encoding: ??? (no palette-enabled encoder yet)
1677 * - decoding: Set by user.
1679 struct AVPaletteControl *palctrl;
1682 * noise reduction strength
1683 * - encoding: Set by user.
1684 * - decoding: unused
1686 int noise_reduction;
1689 * Called at the beginning of a frame to get cr buffer for it.
1690 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1691 * libavcodec will pass previous buffer in pic, function should return
1692 * same buffer or new buffer with old frame "painted" into it.
1693 * If pic.data[0] == NULL must behave like get_buffer().
1694 * - encoding: unused
1695 * - decoding: Set by libavcodec., user can override
1697 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1700 * Number of bits which should be loaded into the rc buffer before decoding starts.
1701 * - encoding: Set by user.
1702 * - decoding: unused
1704 int rc_initial_buffer_occupancy;
1708 * - encoding: Set by user.
1709 * - decoding: unused
1711 int inter_threshold;
1715 * - encoding: Set by user.
1716 * - decoding: Set by user.
1721 * Simulates errors in the bitstream to test error concealment.
1722 * - encoding: Set by user.
1723 * - decoding: unused
1728 * MP3 antialias algorithm, see FF_AA_* below.
1729 * - encoding: unused
1730 * - decoding: Set by user.
1733 #define FF_AA_AUTO 0
1734 #define FF_AA_FASTINT 1 //not implemented yet
1736 #define FF_AA_FLOAT 3
1738 * quantizer noise shaping
1739 * - encoding: Set by user.
1740 * - decoding: unused
1742 int quantizer_noise_shaping;
1746 * is used to decide how many independent tasks should be passed to execute()
1747 * - encoding: Set by user.
1748 * - decoding: Set by user.
1753 * The codec may call this to execute several independent things.
1754 * It will return only after finishing all tasks.
1755 * The user may replace this with some multithreaded implementation,
1756 * the default implementation will execute the parts serially.
1757 * @param count the number of things to execute
1758 * - encoding: Set by libavcodec, user can override.
1759 * - decoding: Set by libavcodec, user can override.
1761 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void **arg2, int *ret, int count);
1765 * Can be used by execute() to store some per AVCodecContext stuff.
1766 * - encoding: set by execute()
1767 * - decoding: set by execute()
1769 void *thread_opaque;
1772 * Motion estimation threshold below which no motion estimation is
1773 * performed, but instead the user specified motion vectors are used.
1775 * - encoding: Set by user.
1776 * - decoding: unused
1781 * Macroblock threshold below which the user specified macroblock types will be used.
1782 * - encoding: Set by user.
1783 * - decoding: unused
1788 * precision of the intra DC coefficient - 8
1789 * - encoding: Set by user.
1790 * - decoding: unused
1792 int intra_dc_precision;
1795 * noise vs. sse weight for the nsse comparsion function
1796 * - encoding: Set by user.
1797 * - decoding: unused
1802 * Number of macroblock rows at the top which are skipped.
1803 * - encoding: unused
1804 * - decoding: Set by user.
1809 * Number of macroblock rows at the bottom which are skipped.
1810 * - encoding: unused
1811 * - decoding: Set by user.
1817 * - encoding: Set by user.
1818 * - decoding: Set by libavcodec.
1821 #define FF_PROFILE_UNKNOWN -99
1825 * - encoding: Set by user.
1826 * - decoding: Set by libavcodec.
1829 #define FF_LEVEL_UNKNOWN -99
1832 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1833 * - encoding: unused
1834 * - decoding: Set by user.
1839 * Bitstream width / height, may be different from width/height if lowres
1840 * or other things are used.
1841 * - encoding: unused
1842 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1844 int coded_width, coded_height;
1847 * frame skip threshold
1848 * - encoding: Set by user.
1849 * - decoding: unused
1851 int frame_skip_threshold;
1855 * - encoding: Set by user.
1856 * - decoding: unused
1858 int frame_skip_factor;
1861 * frame skip exponent
1862 * - encoding: Set by user.
1863 * - decoding: unused
1868 * frame skip comparison function
1869 * - encoding: Set by user.
1870 * - decoding: unused
1875 * Border processing masking, raises the quantizer for mbs on the borders
1877 * - encoding: Set by user.
1878 * - decoding: unused
1880 float border_masking;
1883 * minimum MB lagrange multipler
1884 * - encoding: Set by user.
1885 * - decoding: unused
1890 * maximum MB lagrange multipler
1891 * - encoding: Set by user.
1892 * - decoding: unused
1898 * - encoding: Set by user.
1899 * - decoding: unused
1901 int me_penalty_compensation;
1905 * - encoding: unused
1906 * - decoding: Set by user.
1908 enum AVDiscard skip_loop_filter;
1912 * - encoding: unused
1913 * - decoding: Set by user.
1915 enum AVDiscard skip_idct;
1919 * - encoding: unused
1920 * - decoding: Set by user.
1922 enum AVDiscard skip_frame;
1926 * - encoding: Set by user.
1927 * - decoding: unused
1933 * - encoding: Set by user.
1934 * - decoding: unused
1939 * constant rate factor - quality-based VBR - values ~correspond to qps
1940 * - encoding: Set by user.
1941 * - decoding: unused
1946 * constant quantization parameter rate control method
1947 * - encoding: Set by user.
1948 * - decoding: unused
1954 * - encoding: Set by user.
1955 * - decoding: unused
1960 * number of reference frames
1961 * - encoding: Set by user.
1962 * - decoding: unused
1967 * chroma qp offset from luma
1968 * - encoding: Set by user.
1969 * - decoding: unused
1974 * Influences how often B-frames are used.
1975 * - encoding: Set by user.
1976 * - decoding: unused
1981 * trellis RD quantization
1982 * - encoding: Set by user.
1983 * - decoding: unused
1988 * Reduce fluctuations in qp (before curve compression).
1989 * - encoding: Set by user.
1990 * - decoding: unused
1992 float complexityblur;
1995 * in-loop deblocking filter alphac0 parameter
1996 * alpha is in the range -6...6
1997 * - encoding: Set by user.
1998 * - decoding: unused
2003 * in-loop deblocking filter beta parameter
2004 * beta is in the range -6...6
2005 * - encoding: Set by user.
2006 * - decoding: unused
2011 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2012 * - encoding: Set by user.
2013 * - decoding: unused
2016 #define X264_PART_I4X4 0x001 /* Analyse i4x4 */
2017 #define X264_PART_I8X8 0x002 /* Analyse i8x8 (requires 8x8 transform) */
2018 #define X264_PART_P8X8 0x010 /* Analyse p16x8, p8x16 and p8x8 */
2019 #define X264_PART_P4X4 0x020 /* Analyse p8x4, p4x8, p4x4 */
2020 #define X264_PART_B8X8 0x100 /* Analyse b16x8, b8x16 and b8x8 */
2023 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal)
2024 * - encoding: Set by user.
2025 * - decoding: unused
2030 * Audio cutoff bandwidth (0 means "automatic"), currently used only by FAAC.
2031 * - encoding: Set by user.
2032 * - decoding: unused
2037 * Multiplied by qscale for each frame and added to scene_change_score.
2038 * - encoding: Set by user.
2039 * - decoding: unused
2041 int scenechange_factor;
2045 * Note: Value depends upon the compare function used for fullpel ME.
2046 * - encoding: Set by user.
2047 * - decoding: unused
2052 * Adjusts sensitivity of b_frame_strategy 1.
2053 * - encoding: Set by user.
2054 * - decoding: unused
2059 * - encoding: Set by user.
2060 * - decoding: unused
2062 int compression_level;
2063 #define FF_COMPRESSION_DEFAULT -1
2066 * Sets whether to use LPC mode - used by FLAC encoder.
2067 * - encoding: Set by user.
2068 * - decoding: unused
2073 * LPC coefficient precision - used by FLAC encoder
2074 * - encoding: Set by user.
2075 * - decoding: unused
2077 int lpc_coeff_precision;
2080 * - encoding: Set by user.
2081 * - decoding: unused
2083 int min_prediction_order;
2086 * - encoding: Set by user.
2087 * - decoding: unused
2089 int max_prediction_order;
2092 * search method for selecting prediction order
2093 * - encoding: Set by user.
2094 * - decoding: unused
2096 int prediction_order_method;
2099 * - encoding: Set by user.
2100 * - decoding: unused
2102 int min_partition_order;
2105 * - encoding: Set by user.
2106 * - decoding: unused
2108 int max_partition_order;
2111 * GOP timecode frame start number, in non drop frame format
2112 * - encoding: Set by user.
2113 * - decoding: unused
2115 int64_t timecode_frame_start;
2121 typedef struct AVCodec {
2123 enum CodecType type;
2126 int (*init)(AVCodecContext *);
2127 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2128 int (*close)(AVCodecContext *);
2129 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size,
2130 uint8_t *buf, int buf_size);
2132 struct AVCodec *next;
2133 void (*flush)(AVCodecContext *);
2134 const AVRational *supported_framerates; ///array of supported framerates, or NULL if any, array is terminated by {0,0}
2135 const enum PixelFormat *pix_fmts; ///array of supported pixel formats, or NULL if unknown, array is terminanted by -1
2139 * four components are given, that's all.
2140 * the last component is alpha
2142 typedef struct AVPicture {
2144 int linesize[4]; ///< number of bytes per line
2149 * This structure defines a method for communicating palette changes
2150 * between and demuxer and a decoder.
2151 * This is totally broken, palette changes should be sent as AVPackets.
2153 #define AVPALETTE_SIZE 1024
2154 #define AVPALETTE_COUNT 256
2155 typedef struct AVPaletteControl {
2157 /* Demuxer sets this to 1 to indicate the palette has changed;
2158 * decoder resets to 0. */
2159 int palette_changed;
2161 /* 4-byte ARGB palette entries, stored in native byte order; note that
2162 * the individual palette components should be on a 8-bit scale; if
2163 * the palette data comes from an IBM VGA native format, the component
2164 * data is probably 6 bits in size and needs to be scaled. */
2165 unsigned int palette[AVPALETTE_COUNT];
2167 } AVPaletteControl attribute_deprecated;
2169 typedef struct AVSubtitleRect {
2176 uint32_t *rgba_palette;
2180 typedef struct AVSubtitle {
2181 uint16_t format; /* 0 = graphics */
2182 uint32_t start_display_time; /* relative to packet pts, in ms */
2183 uint32_t end_display_time; /* relative to packet pts, in ms */
2185 AVSubtitleRect *rects;
2188 extern AVCodec ac3_encoder;
2189 extern AVCodec amr_nb_encoder;
2190 extern AVCodec amr_wb_encoder;
2191 extern AVCodec asv1_encoder;
2192 extern AVCodec asv2_encoder;
2193 extern AVCodec bmp_encoder;
2194 extern AVCodec dvvideo_encoder;
2195 extern AVCodec faac_encoder;
2196 extern AVCodec ffv1_encoder;
2197 extern AVCodec ffvhuff_encoder;
2198 extern AVCodec flac_encoder;
2199 extern AVCodec flashsv_encoder;
2200 extern AVCodec flv_encoder;
2201 extern AVCodec gif_encoder;
2202 extern AVCodec h261_encoder;
2203 extern AVCodec h263_encoder;
2204 extern AVCodec h263p_encoder;
2205 extern AVCodec h264_encoder;
2206 extern AVCodec huffyuv_encoder;
2207 extern AVCodec jpegls_encoder;
2208 extern AVCodec libgsm_encoder;
2209 extern AVCodec libgsm_ms_encoder;
2210 extern AVCodec libtheora_encoder;
2211 extern AVCodec ljpeg_encoder;
2212 extern AVCodec mdec_encoder;
2213 extern AVCodec mjpeg_encoder;
2214 extern AVCodec mp2_encoder;
2215 extern AVCodec mp3lame_encoder;
2216 extern AVCodec mpeg1video_encoder;
2217 extern AVCodec mpeg2video_encoder;
2218 extern AVCodec mpeg4_encoder;
2219 extern AVCodec msmpeg4v1_encoder;
2220 extern AVCodec msmpeg4v2_encoder;
2221 extern AVCodec msmpeg4v3_encoder;
2222 extern AVCodec oggvorbis_encoder;
2223 extern AVCodec pam_encoder;
2224 extern AVCodec pbm_encoder;
2225 extern AVCodec pgm_encoder;
2226 extern AVCodec pgmyuv_encoder;
2227 extern AVCodec png_encoder;
2228 extern AVCodec ppm_encoder;
2229 extern AVCodec rv10_encoder;
2230 extern AVCodec rv20_encoder;
2231 extern AVCodec sgi_encoder;
2232 extern AVCodec snow_encoder;
2233 extern AVCodec sonic_encoder;
2234 extern AVCodec sonic_ls_encoder;
2235 extern AVCodec svq1_encoder;
2236 extern AVCodec targa_encoder;
2237 extern AVCodec tiff_encoder;
2238 extern AVCodec vcr1_encoder;
2239 extern AVCodec vorbis_encoder;
2240 extern AVCodec wmav1_encoder;
2241 extern AVCodec wmav2_encoder;
2242 extern AVCodec wmv1_encoder;
2243 extern AVCodec wmv2_encoder;
2244 extern AVCodec x264_encoder;
2245 extern AVCodec xvid_encoder;
2246 extern AVCodec zlib_encoder;
2247 extern AVCodec zmbv_encoder;
2249 extern AVCodec aac_decoder;
2250 extern AVCodec aasc_decoder;
2251 extern AVCodec alac_decoder;
2252 extern AVCodec amr_nb_decoder;
2253 extern AVCodec amr_wb_decoder;
2254 extern AVCodec asv1_decoder;
2255 extern AVCodec asv2_decoder;
2256 extern AVCodec atrac3_decoder;
2257 extern AVCodec avs_decoder;
2258 extern AVCodec bethsoftvid_decoder;
2259 extern AVCodec bmp_decoder;
2260 extern AVCodec c93_decoder;
2261 extern AVCodec cavs_decoder;
2262 extern AVCodec cinepak_decoder;
2263 extern AVCodec cljr_decoder;
2264 extern AVCodec cook_decoder;
2265 extern AVCodec cscd_decoder;
2266 extern AVCodec cyuv_decoder;
2267 extern AVCodec dca_decoder;
2268 extern AVCodec dnxhd_decoder;
2269 extern AVCodec dsicinaudio_decoder;
2270 extern AVCodec dsicinvideo_decoder;
2271 extern AVCodec dvvideo_decoder;
2272 extern AVCodec dxa_decoder;
2273 extern AVCodec eightbps_decoder;
2274 extern AVCodec ffv1_decoder;
2275 extern AVCodec ffvhuff_decoder;
2276 extern AVCodec flac_decoder;
2277 extern AVCodec flashsv_decoder;
2278 extern AVCodec flic_decoder;
2279 extern AVCodec flv_decoder;
2280 extern AVCodec fourxm_decoder;
2281 extern AVCodec fraps_decoder;
2282 extern AVCodec gif_decoder;
2283 extern AVCodec h261_decoder;
2284 extern AVCodec h263_decoder;
2285 extern AVCodec h263i_decoder;
2286 extern AVCodec h264_decoder;
2287 extern AVCodec huffyuv_decoder;
2288 extern AVCodec idcin_decoder;
2289 extern AVCodec imc_decoder;
2290 extern AVCodec indeo2_decoder;
2291 extern AVCodec indeo3_decoder;
2292 extern AVCodec interplay_dpcm_decoder;
2293 extern AVCodec interplay_video_decoder;
2294 extern AVCodec kmvc_decoder;
2295 extern AVCodec libgsm_decoder;
2296 extern AVCodec libgsm_ms_decoder;
2297 extern AVCodec loco_decoder;
2298 extern AVCodec mace3_decoder;
2299 extern AVCodec mace6_decoder;
2300 extern AVCodec mdec_decoder;
2301 extern AVCodec mjpeg_decoder;
2302 extern AVCodec mjpegb_decoder;
2303 extern AVCodec mmvideo_decoder;
2304 extern AVCodec mp2_decoder;
2305 extern AVCodec mp3_decoder;
2306 extern AVCodec mp3adu_decoder;
2307 extern AVCodec mp3on4_decoder;
2308 extern AVCodec mpc7_decoder;
2309 extern AVCodec mpeg1video_decoder;
2310 extern AVCodec mpeg2video_decoder;
2311 extern AVCodec mpeg4_decoder;
2312 extern AVCodec mpeg4aac_decoder;
2313 extern AVCodec mpeg_xvmc_decoder;
2314 extern AVCodec mpegvideo_decoder;
2315 extern AVCodec msmpeg4v1_decoder;
2316 extern AVCodec msmpeg4v2_decoder;
2317 extern AVCodec msmpeg4v3_decoder;
2318 extern AVCodec msrle_decoder;
2319 extern AVCodec msvideo1_decoder;
2320 extern AVCodec mszh_decoder;
2321 extern AVCodec nuv_decoder;
2322 extern AVCodec oggvorbis_decoder;
2323 extern AVCodec png_decoder;
2324 extern AVCodec qdm2_decoder;
2325 extern AVCodec qdraw_decoder;
2326 extern AVCodec qpeg_decoder;
2327 extern AVCodec qtrle_decoder;
2328 extern AVCodec ra_144_decoder;
2329 extern AVCodec ra_288_decoder;
2330 extern AVCodec roq_decoder;
2331 extern AVCodec roq_dpcm_decoder;
2332 extern AVCodec rpza_decoder;
2333 extern AVCodec rv10_decoder;
2334 extern AVCodec rv20_decoder;
2335 extern AVCodec rv30_decoder;
2336 extern AVCodec rv40_decoder;
2337 extern AVCodec sgi_decoder;
2338 extern AVCodec shorten_decoder;
2339 extern AVCodec smackaud_decoder;
2340 extern AVCodec smacker_decoder;
2341 extern AVCodec smc_decoder;
2342 extern AVCodec snow_decoder;
2343 extern AVCodec sol_dpcm_decoder;
2344 extern AVCodec sonic_decoder;
2345 extern AVCodec sp5x_decoder;
2346 extern AVCodec svq1_decoder;
2347 extern AVCodec svq3_decoder;
2348 extern AVCodec targa_decoder;
2349 extern AVCodec theora_decoder;
2350 extern AVCodec thp_decoder;
2351 extern AVCodec tiertexseqvideo_decoder;
2352 extern AVCodec tiff_decoder;
2353 extern AVCodec truemotion1_decoder;
2354 extern AVCodec truemotion2_decoder;
2355 extern AVCodec truespeech_decoder;
2356 extern AVCodec tscc_decoder;
2357 extern AVCodec tta_decoder;
2358 extern AVCodec ulti_decoder;
2359 extern AVCodec vc1_decoder;
2360 extern AVCodec vcr1_decoder;
2361 extern AVCodec vmdaudio_decoder;
2362 extern AVCodec vmdvideo_decoder;
2363 extern AVCodec vmnc_decoder;
2364 extern AVCodec vorbis_decoder;
2365 extern AVCodec vp3_decoder;
2366 extern AVCodec vp5_decoder;
2367 extern AVCodec vp6_decoder;
2368 extern AVCodec vp6f_decoder;
2369 extern AVCodec vqa_decoder;
2370 extern AVCodec wavpack_decoder;
2371 extern AVCodec wmav1_decoder;
2372 extern AVCodec wmav2_decoder;
2373 extern AVCodec wmv1_decoder;
2374 extern AVCodec wmv2_decoder;
2375 extern AVCodec wmv3_decoder;
2376 extern AVCodec wnv1_decoder;
2377 extern AVCodec ws_snd1_decoder;
2378 extern AVCodec xan_dpcm_decoder;
2379 extern AVCodec xan_wc3_decoder;
2380 extern AVCodec xl_decoder;
2381 extern AVCodec zlib_decoder;
2382 extern AVCodec zmbv_decoder;
2385 #define PCM_CODEC(id, name) \
2386 extern AVCodec name ## _decoder; \
2387 extern AVCodec name ## _encoder
2389 PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
2390 PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
2391 PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
2392 PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
2393 PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
2394 PCM_CODEC(CODEC_ID_PCM_S24BE, pcm_s24be);
2395 PCM_CODEC(CODEC_ID_PCM_S24DAUD, pcm_s24daud);
2396 PCM_CODEC(CODEC_ID_PCM_S24LE, pcm_s24le);
2397 PCM_CODEC(CODEC_ID_PCM_S32BE, pcm_s32be);
2398 PCM_CODEC(CODEC_ID_PCM_S32LE, pcm_s32le);
2399 PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
2400 PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
2401 PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
2402 PCM_CODEC(CODEC_ID_PCM_U24BE, pcm_u24be);
2403 PCM_CODEC(CODEC_ID_PCM_U24LE, pcm_u24le);
2404 PCM_CODEC(CODEC_ID_PCM_U32BE, pcm_u32be);
2405 PCM_CODEC(CODEC_ID_PCM_U32LE, pcm_u32le);
2409 PCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
2410 PCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx);
2411 PCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);
2412 PCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);
2413 PCM_CODEC(CODEC_ID_ADPCM_G726, adpcm_g726);
2414 PCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
2415 PCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
2416 PCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
2417 PCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
2418 PCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);
2419 PCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
2420 PCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);
2421 PCM_CODEC(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);
2422 PCM_CODEC(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);
2423 PCM_CODEC(CODEC_ID_ADPCM_SMJPEG, adpcm_ima_smjpeg);
2424 PCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
2425 PCM_CODEC(CODEC_ID_ADPCM_THP, adpcm_thp);
2426 PCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);
2427 PCM_CODEC(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);
2431 /* dummy raw video codec */
2432 extern AVCodec rawvideo_decoder;
2433 extern AVCodec rawvideo_encoder;
2435 /* the following codecs use external GPL libs */
2436 extern AVCodec dts_decoder;
2437 extern AVCodec liba52_decoder;
2440 extern AVCodec dvbsub_decoder;
2441 extern AVCodec dvbsub_encoder;
2442 extern AVCodec dvdsub_decoder;
2443 extern AVCodec dvdsub_encoder;
2447 struct ReSampleContext;
2448 struct AVResampleContext;
2450 typedef struct ReSampleContext ReSampleContext;
2452 ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2453 int output_rate, int input_rate);
2454 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2455 void audio_resample_close(ReSampleContext *s);
2457 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2458 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2459 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2460 void av_resample_close(struct AVResampleContext *c);
2462 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2463 /* YUV420 format is assumed ! */
2465 struct ImgReSampleContext attribute_deprecated;
2467 typedef struct ImgReSampleContext ImgReSampleContext attribute_deprecated;
2469 attribute_deprecated ImgReSampleContext *img_resample_init(int output_width, int output_height,
2470 int input_width, int input_height);
2472 attribute_deprecated ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
2473 int iwidth, int iheight,
2474 int topBand, int bottomBand,
2475 int leftBand, int rightBand,
2476 int padtop, int padbottom,
2477 int padleft, int padright);
2480 attribute_deprecated void img_resample(ImgReSampleContext *s,
2481 AVPicture *output, const AVPicture *input);
2483 attribute_deprecated void img_resample_close(ImgReSampleContext *s);
2488 * Allocate memory for a picture. Call avpicture_free to free it.
2490 * @param picture the picture to be filled in
2491 * @param pix_fmt the format of the picture
2492 * @param width the width of the picture
2493 * @param height the height of the picture
2494 * @return zero if successful, a negative value if not
2496 int avpicture_alloc(AVPicture *picture, int pix_fmt, int width, int height);
2499 * Free a picture previously allocated by avpicture_alloc().
2501 * @param picture the AVPicture to be freed
2503 void avpicture_free(AVPicture *picture);
2506 * Fill in the AVPicture fields.
2507 * The fields of the given AVPicture are filled in by using the 'ptr' address
2508 * which points to the image data buffer. Depending on the specified picture
2509 * format, one or multiple image data pointers and line sizes will be set.
2510 * If a planar format is specified, several pointers will be set pointing to
2511 * the different picture planes and the line sizes of the different planes
2512 * will be stored in the lines_sizes array.
2514 * @param picture AVPicture whose fields are to be filled in
2515 * @param ptr Buffer which will contain or contains the actual image data
2516 * @param pix_fmt The format in which the picture data is stored.
2517 * @param width the width of the image in pixels
2518 * @param height the height of the image in pixels
2519 * @return size of the image data in bytes
2521 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2522 int pix_fmt, int width, int height);
2523 int avpicture_layout(const AVPicture* src, int pix_fmt, int width, int height,
2524 unsigned char *dest, int dest_size);
2527 * Calculate the size in bytes that a picture of the given width and height
2528 * would occupy if stored in the given picture format.
2530 * @param pix_fmt the given picture format
2531 * @param width the width of the image
2532 * @param height the height of the image
2533 * @return Image data size in bytes
2535 int avpicture_get_size(int pix_fmt, int width, int height);
2536 void avcodec_get_chroma_sub_sample(int pix_fmt, int *h_shift, int *v_shift);
2537 const char *avcodec_get_pix_fmt_name(int pix_fmt);
2538 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2539 enum PixelFormat avcodec_get_pix_fmt(const char* name);
2540 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);
2542 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
2543 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
2544 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
2545 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
2546 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
2547 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
2550 * Computes what kind of losses will occur when converting from one specific
2551 * pixel format to another.
2552 * When converting from one pixel format to another, information loss may occur.
2553 * For example, when converting from RGB24 to GRAY, the color information will
2554 * be lost. Similarly, other losses occur when converting from some formats to
2555 * other formats. These losses can involve loss of chroma, but also loss of
2556 * resolution, loss of color depth, loss due to the color space conversion, loss
2557 * of the alpha bits or loss due to color quantization.
2558 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
2559 * which will occur when converting from one pixel format to another.
2561 * @param[in] dst_pix_fmt destination pixel format
2562 * @param[in] src_pix_fmt source pixel format
2563 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2564 * @return Combination of flags informing you what kind of losses will occur.
2566 int avcodec_get_pix_fmt_loss(int dst_pix_fmt, int src_pix_fmt,
2570 * Finds the best pixel format to convert to given a certain source pixel
2571 * format. When converting from one pixel format to another, information loss
2572 * may occur. For example, when converting from RGB24 to GRAY, the color
2573 * information will be lost. Similarly, other losses occur when converting from
2574 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
2575 * the given pixel formats should be used to suffer the least amount of loss.
2576 * The pixel formats from which it chooses one, are determined by the
2577 * \p pix_fmt_mask parameter.
2580 * src_pix_fmt = PIX_FMT_YUV420P;
2581 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
2582 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
2585 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
2586 * @param[in] src_pix_fmt source pixel format
2587 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2588 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
2589 * @return The best pixel format to convert to or -1 if none was found.
2591 int avcodec_find_best_pix_fmt(int pix_fmt_mask, int src_pix_fmt,
2592 int has_alpha, int *loss_ptr);
2594 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
2595 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
2598 * Tell if an image really has transparent alpha values.
2599 * @return ored mask of FF_ALPHA_xxx constants
2601 int img_get_alpha_info(const AVPicture *src,
2602 int pix_fmt, int width, int height);
2604 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2605 /* convert among pixel formats */
2606 attribute_deprecated int img_convert(AVPicture *dst, int dst_pix_fmt,
2607 const AVPicture *src, int pix_fmt,
2608 int width, int height);
2611 /* deinterlace a picture */
2612 /* deinterlace - if not supported return -1 */
2613 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
2614 int pix_fmt, int width, int height);
2616 /* external high level API */
2618 extern AVCodec *first_avcodec;
2620 /* returns LIBAVCODEC_VERSION_INT constant */
2621 unsigned avcodec_version(void);
2622 /* returns LIBAVCODEC_BUILD constant */
2623 unsigned avcodec_build(void);
2626 * Initializes libavcodec.
2628 * @warning This function \e must be called before any other libavcodec
2631 void avcodec_init(void);
2633 void register_avcodec(AVCodec *format);
2636 * Finds an encoder with a matching codec ID.
2638 * @param id CodecID of the requested encoder
2639 * @return An encoder if one was found, NULL otherwise.
2641 AVCodec *avcodec_find_encoder(enum CodecID id);
2644 * Finds an encoder with the specified name.
2646 * @param name name of the requested encoder
2647 * @return An encoder if one was found, NULL otherwise.
2649 AVCodec *avcodec_find_encoder_by_name(const char *name);
2652 * Finds a decoder with a matching codec ID.
2654 * @param id CodecID of the requested decoder
2655 * @return A decoder if one was found, NULL otherwise.
2657 AVCodec *avcodec_find_decoder(enum CodecID id);
2660 * Finds an decoder with the specified name.
2662 * @param name name of the requested decoder
2663 * @return A decoder if one was found, NULL otherwise.
2665 AVCodec *avcodec_find_decoder_by_name(const char *name);
2666 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
2669 * Sets the fields of the given AVCodecContext to default values.
2671 * @param s The AVCodecContext of which the fields should be set to default values.
2673 void avcodec_get_context_defaults(AVCodecContext *s);
2675 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2676 * we WILL change its arguments and name a few times! */
2677 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
2680 * Allocates an AVCodecContext and sets its fields to default values. The
2681 * resulting struct can be deallocated by simply calling av_free().
2683 * @return An AVCodecContext filled with default values or NULL on failure.
2684 * @see avcodec_get_context_defaults
2686 AVCodecContext *avcodec_alloc_context(void);
2688 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2689 * we WILL change its arguments and name a few times! */
2690 AVCodecContext *avcodec_alloc_context2(enum CodecType);
2693 * Sets the fields of the given AVFrame to default values.
2695 * @param pic The AVFrame of which the fields should be set to default values.
2697 void avcodec_get_frame_defaults(AVFrame *pic);
2700 * Allocates an AVFrame and sets its fields to default values. The resulting
2701 * struct can be deallocated by simply calling av_free().
2703 * @return An AVFrame filled with default values or NULL on failure.
2704 * @see avcodec_get_frame_defaults
2706 AVFrame *avcodec_alloc_frame(void);
2708 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
2709 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
2710 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
2711 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
2714 * Checks if the given dimension of a picture is valid, meaning that all
2715 * bytes of the picture can be addressed with a signed int.
2717 * @param[in] w Width of the picture.
2718 * @param[in] h Height of the picture.
2719 * @return Zero if valid, a negative value if invalid.
2721 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
2722 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
2724 int avcodec_thread_init(AVCodecContext *s, int thread_count);
2725 void avcodec_thread_free(AVCodecContext *s);
2726 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2727 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2728 //FIXME func typedef
2731 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
2732 * function the context has to be allocated.
2734 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2735 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2736 * retrieving a codec.
2738 * @warning This function is not thread safe!
2741 * codec = avcodec_find_decoder(CODEC_ID_H264);
2745 * context = avcodec_alloc_context();
2747 * if (avcodec_open(context, codec) < 0)
2751 * @param avctx The context which will be set up to use the given codec.
2752 * @param codec The codec to use within the context.
2753 * @return zero on success, a negative value on error
2754 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
2756 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
2759 * @deprecated Use avcodec_decode_audio2() instead.
2761 attribute_deprecated int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
2762 int *frame_size_ptr,
2763 uint8_t *buf, int buf_size);
2766 * Decodes an audio frame from \p buf into \p samples.
2767 * The avcodec_decode_audio2() function decodes an audio frame from the input
2768 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2769 * audio codec which was coupled with \p avctx using avcodec_open(). The
2770 * resulting decoded frame is stored in output buffer \p samples. If no frame
2771 * could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
2772 * decompressed frame size in \e bytes.
2774 * @warning You \e must set \p frame_size_ptr to the allocated size of the
2775 * output buffer before calling avcodec_decode_audio2().
2777 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2778 * the actual read bytes because some optimized bitstream readers read 32 or 64
2779 * bits at once and could read over the end.
2781 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2782 * no overreading happens for damaged MPEG streams.
2784 * @note You might have to align the input buffer \p buf and output buffer \p
2785 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
2786 * necessary at all, on others it won't work at all if not aligned and on others
2787 * it will work but it will have an impact on performance. In practice, the
2788 * bitstream should have 4 byte alignment at minimum and all sample data should
2789 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2790 * the linesize is not a multiple of 16 then there's no sense in aligning the
2791 * start of the buffer to 16.
2793 * @param avctx the codec context
2794 * @param[out] samples the output buffer
2795 * @param[in,out] frame_size_ptr the output buffer size in bytes
2796 * @param[in] buf the input buffer
2797 * @param[in] buf_size the input buffer size in bytes
2798 * @return On error a negative value is returned, otherwise the number of bytes
2799 * used or zero if no frame could be decompressed.
2801 int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
2802 int *frame_size_ptr,
2803 uint8_t *buf, int buf_size);
2806 * Decodes a video frame from \p buf into \p picture.
2807 * The avcodec_decode_video() function decodes a video frame from the input
2808 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2809 * video codec which was coupled with \p avctx using avcodec_open(). The
2810 * resulting decoded frame is stored in \p picture.
2812 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2813 * the actual read bytes because some optimized bitstream readers read 32 or 64
2814 * bits at once and could read over the end.
2816 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2817 * no overreading happens for damaged MPEG streams.
2819 * @note You might have to align the input buffer \p buf and output buffer \p
2820 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
2821 * necessary at all, on others it won't work at all if not aligned and on others
2822 * it will work but it will have an impact on performance. In practice, the
2823 * bitstream should have 4 byte alignment at minimum and all sample data should
2824 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2825 * the linesize is not a multiple of 16 then there's no sense in aligning the
2826 * start of the buffer to 16.
2828 * @param avctx the codec context
2829 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
2830 * @param[in] buf the input buffer
2831 * @param[in] buf_size the size of the input buffer in bytes
2832 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
2833 * @return On error a negative value is returned, otherwise the number of bytes
2834 * used or zero if no frame could be decompressed.
2836 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
2837 int *got_picture_ptr,
2838 uint8_t *buf, int buf_size);
2840 /* Decode a subtitle message. Return -1 if error, otherwise return the
2841 * number of bytes used. If no subtitle could be decompressed,
2842 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
2843 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
2845 const uint8_t *buf, int buf_size);
2846 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
2848 uint8_t *buf, int buf_size);
2851 * Encodes an audio frame from \p samples into \p buf.
2852 * The avcodec_encode_audio() function encodes an audio frame from the input
2853 * buffer \p samples. To encode it, it makes use of the audio codec which was
2854 * coupled with \p avctx using avcodec_open(). The resulting encoded frame is
2855 * stored in output buffer \p buf.
2857 * @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
2859 * @param avctx the codec context
2860 * @param[out] buf the output buffer
2861 * @param[in] buf_size the output buffer size
2862 * @param[in] samples the input buffer containing the samples
2863 * @return On error a negative value is returned, on succes zero or the number
2864 * of bytes used from the input buffer.
2866 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2867 const short *samples);
2870 * Encodes a video frame from \p pict into \p buf.
2871 * The avcodec_encode_video() function encodes a video frame from the input
2872 * \p pict. To encode it, it makes use of the video codec which was coupled with
2873 * \p avctx using avcodec_open(). The resulting encoded bytes representing the
2874 * frame are stored in the output buffer \p buf. The input picture should be
2875 * stored using a specific format, namely \c avctx.pix_fmt.
2877 * @param avctx the codec context
2878 * @param[out] buf the output buffer for the bitstream of encoded frame
2879 * @param[in] buf_size the size of the output buffer in bytes
2880 * @param[in] pict the input picture to encode
2881 * @return On error a negative value is returned, on success zero or the number
2882 * of bytes used from the input buffer.
2884 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2885 const AVFrame *pict);
2886 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2887 const AVSubtitle *sub);
2889 int avcodec_close(AVCodecContext *avctx);
2891 void avcodec_register_all(void);
2894 * Flush buffers, should be called when seeking or when switching to a different stream.
2896 void avcodec_flush_buffers(AVCodecContext *avctx);
2898 void avcodec_default_free_buffers(AVCodecContext *s);
2900 /* misc useful functions */
2903 * Returns a single letter to describe the given picture type \p pict_type.
2905 * @param[in] pict_type the picture type
2906 * @return A single character representing the picture type.
2908 char av_get_pict_type_char(int pict_type);
2911 * Returns codec bits per sample.
2913 * @param[in] codec_id the codec
2914 * @return Number of bits per sample or zero if unknown for the given codec.
2916 int av_get_bits_per_sample(enum CodecID codec_id);
2919 typedef struct AVCodecParserContext {
2921 struct AVCodecParser *parser;
2922 int64_t frame_offset; /* offset of the current frame */
2923 int64_t cur_offset; /* current offset
2924 (incremented by each av_parser_parse()) */
2925 int64_t last_frame_offset; /* offset of the last frame */
2927 int pict_type; /* XXX: Put it back in AVCodecContext. */
2928 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
2929 int64_t pts; /* pts of the current frame */
2930 int64_t dts; /* dts of the current frame */
2935 int fetch_timestamp;
2937 #define AV_PARSER_PTS_NB 4
2938 int cur_frame_start_index;
2939 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
2940 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
2941 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
2944 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
2946 int64_t offset; ///< byte offset from starting packet start
2947 int64_t last_offset;
2948 } AVCodecParserContext;
2950 typedef struct AVCodecParser {
2951 int codec_ids[5]; /* several codec IDs are permitted */
2953 int (*parser_init)(AVCodecParserContext *s);
2954 int (*parser_parse)(AVCodecParserContext *s,
2955 AVCodecContext *avctx,
2956 uint8_t **poutbuf, int *poutbuf_size,
2957 const uint8_t *buf, int buf_size);
2958 void (*parser_close)(AVCodecParserContext *s);
2959 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
2960 struct AVCodecParser *next;
2963 extern AVCodecParser *av_first_parser;
2965 void av_register_codec_parser(AVCodecParser *parser);
2966 AVCodecParserContext *av_parser_init(int codec_id);
2967 int av_parser_parse(AVCodecParserContext *s,
2968 AVCodecContext *avctx,
2969 uint8_t **poutbuf, int *poutbuf_size,
2970 const uint8_t *buf, int buf_size,
2971 int64_t pts, int64_t dts);
2972 int av_parser_change(AVCodecParserContext *s,
2973 AVCodecContext *avctx,
2974 uint8_t **poutbuf, int *poutbuf_size,
2975 const uint8_t *buf, int buf_size, int keyframe);
2976 void av_parser_close(AVCodecParserContext *s);
2978 extern AVCodecParser aac_parser;
2979 extern AVCodecParser ac3_parser;
2980 extern AVCodecParser cavsvideo_parser;
2981 extern AVCodecParser dca_parser;
2982 extern AVCodecParser dvbsub_parser;
2983 extern AVCodecParser dvdsub_parser;
2984 extern AVCodecParser h261_parser;
2985 extern AVCodecParser h263_parser;
2986 extern AVCodecParser h264_parser;
2987 extern AVCodecParser mjpeg_parser;
2988 extern AVCodecParser mpeg4video_parser;
2989 extern AVCodecParser mpegaudio_parser;
2990 extern AVCodecParser mpegvideo_parser;
2991 extern AVCodecParser pnm_parser;
2992 extern AVCodecParser vc1_parser;
2995 typedef struct AVBitStreamFilterContext {
2997 struct AVBitStreamFilter *filter;
2998 AVCodecParserContext *parser;
2999 struct AVBitStreamFilterContext *next;
3000 } AVBitStreamFilterContext;
3003 typedef struct AVBitStreamFilter {
3006 int (*filter)(AVBitStreamFilterContext *bsfc,
3007 AVCodecContext *avctx, const char *args,
3008 uint8_t **poutbuf, int *poutbuf_size,
3009 const uint8_t *buf, int buf_size, int keyframe);
3010 struct AVBitStreamFilter *next;
3011 } AVBitStreamFilter;
3013 extern AVBitStreamFilter *av_first_bitstream_filter;
3015 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3016 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3017 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3018 AVCodecContext *avctx, const char *args,
3019 uint8_t **poutbuf, int *poutbuf_size,
3020 const uint8_t *buf, int buf_size, int keyframe);
3021 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3023 extern AVBitStreamFilter dump_extradata_bsf;
3024 extern AVBitStreamFilter remove_extradata_bsf;
3025 extern AVBitStreamFilter noise_bsf;
3026 extern AVBitStreamFilter mp3_header_compress_bsf;
3027 extern AVBitStreamFilter mp3_header_decompress_bsf;
3028 extern AVBitStreamFilter mjpega_dump_header_bsf;
3029 extern AVBitStreamFilter imx_dump_header_bsf;
3035 * Reallocates the given block if it is not large enough, otherwise it
3040 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
3042 /* for static data only */
3045 * Frees all static arrays and resets their pointers to 0.
3046 * Call this function to release all statically allocated tables.
3048 attribute_deprecated void av_free_static(void);
3051 * Allocation of static arrays.
3053 * @warning Do not use for normal allocation.
3055 * @param[in] size The amount of memory you need in bytes.
3056 * @return block of memory of the requested size
3058 attribute_deprecated void *av_mallocz_static(unsigned int size);
3061 * Copy image 'src' to 'dst'.
3063 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3064 int pix_fmt, int width, int height);
3067 * Crop image top and left side.
3069 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3070 int pix_fmt, int top_band, int left_band);
3075 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
3076 int padtop, int padbottom, int padleft, int padright, int *color);
3078 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
3079 attribute_deprecated void img_copy(AVPicture *dst, const AVPicture *src,
3080 int pix_fmt, int width, int height);
3082 attribute_deprecated int img_crop(AVPicture *dst, const AVPicture *src,
3083 int pix_fmt, int top_band, int left_band);
3085 attribute_deprecated int img_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
3086 int padtop, int padbottom, int padleft, int padright, int *color);
3089 extern unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
3091 /* error handling */
3093 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
3094 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
3096 /* Some platforms have E* and errno already negated. */
3097 #define AVERROR(e) (e)
3098 #define AVUNERROR(e) (e)
3100 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
3101 #define AVERROR_IO AVERROR(EIO) /**< I/O error */
3102 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< Number syntax expected in filename. */
3103 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
3104 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
3105 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
3106 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< Operation not supported. */
3112 #endif /* AVCODEC_H */