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)+(50<<8)+1)
37 #define LIBAVCODEC_VERSION 51.50.1
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,
175 /* various PCM "codecs" */
176 CODEC_ID_PCM_S16LE= 0x10000,
192 CODEC_ID_PCM_S24DAUD,
194 CODEC_ID_PCM_S16LE_PLANAR,
196 /* various ADPCM codecs */
197 CODEC_ID_ADPCM_IMA_QT= 0x11000,
198 CODEC_ID_ADPCM_IMA_WAV,
199 CODEC_ID_ADPCM_IMA_DK3,
200 CODEC_ID_ADPCM_IMA_DK4,
201 CODEC_ID_ADPCM_IMA_WS,
202 CODEC_ID_ADPCM_IMA_SMJPEG,
211 CODEC_ID_ADPCM_YAMAHA,
212 CODEC_ID_ADPCM_SBPRO_4,
213 CODEC_ID_ADPCM_SBPRO_3,
214 CODEC_ID_ADPCM_SBPRO_2,
216 CODEC_ID_ADPCM_IMA_AMV,
217 CODEC_ID_ADPCM_EA_R1,
218 CODEC_ID_ADPCM_EA_R3,
219 CODEC_ID_ADPCM_EA_R2,
220 CODEC_ID_ADPCM_IMA_EA_SEAD,
221 CODEC_ID_ADPCM_IMA_EA_EACS,
222 CODEC_ID_ADPCM_EA_XAS,
225 CODEC_ID_AMR_NB= 0x12000,
228 /* RealAudio codecs*/
229 CODEC_ID_RA_144= 0x13000,
232 /* various DPCM codecs */
233 CODEC_ID_ROQ_DPCM= 0x14000,
234 CODEC_ID_INTERPLAY_DPCM,
238 CODEC_ID_MP2= 0x15000,
239 CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
241 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
260 CODEC_ID_WESTWOOD_SND1,
261 CODEC_ID_GSM, ///< as in Berlin toast format
269 CODEC_ID_DSICINAUDIO,
273 CODEC_ID_GSM_MS, /* as found in WAV */
281 /* subtitle codecs */
282 CODEC_ID_DVD_SUBTITLE= 0x17000,
283 CODEC_ID_DVB_SUBTITLE,
284 CODEC_ID_TEXT, ///< raw UTF-8 text
289 /* other specific kind of codecs (generaly used for attachments) */
290 CODEC_ID_TTF= 0x18000,
292 CODEC_ID_MPEG2TS= 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
293 * stream (only used by libavformat) */
296 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
297 /* CODEC_ID_MP3LAME is obsolete */
298 #define CODEC_ID_MP3LAME CODEC_ID_MP3
299 #define CODEC_ID_MPEG4AAC CODEC_ID_AAC
303 CODEC_TYPE_UNKNOWN = -1,
308 CODEC_TYPE_ATTACHMENT,
313 * Currently unused, may be used if 24/32 bits samples are ever supported.
314 * all in native-endian format
317 SAMPLE_FMT_NONE = -1,
318 SAMPLE_FMT_U8, ///< unsigned 8 bits
319 SAMPLE_FMT_S16, ///< signed 16 bits
320 SAMPLE_FMT_S24, ///< signed 24 bits
321 SAMPLE_FMT_S32, ///< signed 32 bits
322 SAMPLE_FMT_FLT, ///< float
326 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
329 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
330 * This is mainly needed because some optimized bitstream readers read
331 * 32 or 64 bit at once and could read over the end.<br>
332 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
333 * MPEG bitstreams could cause overread and segfault.
335 #define FF_INPUT_BUFFER_PADDING_SIZE 8
338 * minimum encoding buffer size
339 * Used to avoid some checks during header writing.
341 #define FF_MIN_BUFFER_SIZE 16384
344 * motion estimation type.
347 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
351 ME_EPZS, ///< enhanced predictive zonal search
352 ME_X1, ///< reserved for experiments
353 ME_HEX, ///< hexagon based search
354 ME_UMH, ///< uneven multi-hexagon search
355 ME_ITER, ///< iterative search
359 /* We leave some space between them for extensions (drop some
360 * keyframes for intra-only or drop just some bidir frames). */
361 AVDISCARD_NONE =-16, ///< discard nothing
362 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
363 AVDISCARD_NONREF = 8, ///< discard all non reference
364 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
365 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
366 AVDISCARD_ALL = 48, ///< discard all
369 typedef struct RcOverride{
372 int qscale; // If this is 0 then quality_factor will be used instead.
373 float quality_factor;
376 #define FF_MAX_B_FRAMES 16
379 These flags can be passed in AVCodecContext.flags before initialization.
380 Note: Not everything is supported yet.
383 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
384 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
385 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
386 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
387 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
388 #define CODEC_FLAG_PART 0x0080 ///< Use data partitioning.
390 * The parent program guarantees that the input for B-frames containing
391 * streams is not written to for at least s->max_b_frames+1 frames, if
392 * this is not set the input will be copied.
394 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
395 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
396 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
397 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< Use external Huffman table (for MJPEG).
398 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
399 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
400 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
401 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
402 location instead of only at frame boundaries. */
403 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
404 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
405 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
406 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< Use alternate scan.
407 #define CODEC_FLAG_TRELLIS_QUANT 0x00200000 ///< Use trellis quantization.
408 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
409 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
410 /* Fx : Flag for h263+ extra options */
411 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
412 #define CODEC_FLAG_H263P_AIC 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction (remove this)
414 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
415 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< unlimited motion vector
416 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
417 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
418 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H.263 alternative inter VLC
419 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
420 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
421 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
422 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
423 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< Will reserve space for SVCD scan offset user data.
424 #define CODEC_FLAG_CLOSED_GOP ((int)0x80000000)
425 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
426 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
427 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
428 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
429 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow B-frames to be used as references.
430 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for B-frames
431 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
432 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
433 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
434 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
435 #define CODEC_FLAG2_BRDO 0x00000400 ///< B-frame rate-distortion optimization
436 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< Use MPEG-2 intra VLC table.
437 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< Only do ME/MC (I frames -> ref, P frame -> ME+MC).
438 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format.
439 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
440 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
441 #define CODEC_FLAG2_NON_LINEAR_QUANT 0x00010000 ///< Use MPEG-2 nonlinear quantizer.
442 #define CODEC_FLAG2_BIT_RESERVOIR 0x00020000 ///< Use a bit reservoir when encoding if possible
444 /* Unsupported options :
445 * Syntax Arithmetic coding (SAC)
446 * Reference Picture Selection
447 * Independent Segment Decoding */
449 /* codec capabilities */
451 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
453 * Codec uses get_buffer() for allocating buffers.
454 * direct rendering method 1
456 #define CODEC_CAP_DR1 0x0002
457 /* If 'parse_only' field is true, then avcodec_parse_frame() can be used. */
458 #define CODEC_CAP_PARSE_ONLY 0x0004
459 #define CODEC_CAP_TRUNCATED 0x0008
460 /* Codec can export data for HW decoding (XvMC). */
461 #define CODEC_CAP_HWACCEL 0x0010
463 * Codec has a nonzero delay and needs to be fed with NULL at the end to get the delayed data.
464 * If this is not set, the codec is guaranteed to never be fed with NULL data.
466 #define CODEC_CAP_DELAY 0x0020
468 * Codec can be fed a final frame with a smaller size.
469 * This can be used to prevent truncation of the last audio samples.
471 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
473 //The following defines may change, don't expect compatibility if you use them.
474 #define MB_TYPE_INTRA4x4 0x0001
475 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
476 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
477 #define MB_TYPE_16x16 0x0008
478 #define MB_TYPE_16x8 0x0010
479 #define MB_TYPE_8x16 0x0020
480 #define MB_TYPE_8x8 0x0040
481 #define MB_TYPE_INTERLACED 0x0080
482 #define MB_TYPE_DIRECT2 0x0100 //FIXME
483 #define MB_TYPE_ACPRED 0x0200
484 #define MB_TYPE_GMC 0x0400
485 #define MB_TYPE_SKIP 0x0800
486 #define MB_TYPE_P0L0 0x1000
487 #define MB_TYPE_P1L0 0x2000
488 #define MB_TYPE_P0L1 0x4000
489 #define MB_TYPE_P1L1 0x8000
490 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
491 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
492 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
493 #define MB_TYPE_QUANT 0x00010000
494 #define MB_TYPE_CBP 0x00020000
495 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
499 * This specifies the area which should be displayed.
500 * Note there may be multiple such areas for one frame.
502 typedef struct AVPanScan{
505 * - encoding: Set by user.
506 * - decoding: Set by libavcodec.
511 * width and height in 1/16 pel
512 * - encoding: Set by user.
513 * - decoding: Set by libavcodec.
519 * position of the top left corner in 1/16 pel for up to 3 fields/frames
520 * - encoding: Set by user.
521 * - decoding: Set by libavcodec.
523 int16_t position[3][2];
526 #define FF_COMMON_FRAME \
528 * pointer to the picture planes.\
529 * This might be different from the first allocated byte\
536 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.\
537 * This isn't used by libavcodec unless the default get/release_buffer() is used.\
543 * 1 -> keyframe, 0-> not\
544 * - encoding: Set by libavcodec.\
545 * - decoding: Set by libavcodec.\
550 * Picture type of the frame, see ?_TYPE below.\
551 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
552 * - decoding: Set by libavcodec.\
557 * presentation timestamp in time_base units (time when frame should be shown to user)\
558 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.\
559 * - encoding: MUST be set by user.\
560 * - decoding: Set by libavcodec.\
565 * picture number in bitstream order\
566 * - encoding: set by\
567 * - decoding: Set by libavcodec.\
569 int coded_picture_number;\
571 * picture number in display order\
572 * - encoding: set by\
573 * - decoding: Set by libavcodec.\
575 int display_picture_number;\
578 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
579 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).\
580 * - decoding: Set by libavcodec.\
585 * buffer age (1->was last buffer and dint change, 2->..., ...).\
586 * Set to INT_MAX if the buffer has not been used yet.\
587 * - encoding: unused\
588 * - decoding: MUST be set by get_buffer().\
593 * is this picture used as reference\
594 * - encoding: unused\
595 * - decoding: Set by libavcodec. (before get_buffer() call)).\
601 * - encoding: unused\
602 * - decoding: Set by libavcodec.\
604 int8_t *qscale_table;\
607 * - encoding: unused\
608 * - decoding: Set by libavcodec.\
613 * mbskip_table[mb]>=1 if MB didn't change\
614 * stride= mb_width = (width+15)>>4\
615 * - encoding: unused\
616 * - decoding: Set by libavcodec.\
618 uint8_t *mbskip_table;\
621 * motion vector table\
624 * int mv_sample_log2= 4 - motion_subsample_log2;\
625 * int mb_width= (width+15)>>4;\
626 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
627 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
629 * - encoding: Set by user.\
630 * - decoding: Set by libavcodec.\
632 int16_t (*motion_val[2])[2];\
635 * macroblock type table\
636 * mb_type_base + mb_width + 2\
637 * - encoding: Set by user.\
638 * - decoding: Set by libavcodec.\
643 * log2 of the size of the block which a single vector in motion_val represents: \
644 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
645 * - encoding: unused\
646 * - decoding: Set by libavcodec.\
648 uint8_t motion_subsample_log2;\
651 * for some private data of the user\
652 * - encoding: unused\
653 * - decoding: Set by user.\
659 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.\
660 * - decoding: unused\
665 * type of the buffer (to keep track of who has to deallocate data[*])\
666 * - encoding: Set by the one who allocates it.\
667 * - decoding: Set by the one who allocates it.\
668 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.\
673 * When decoding, this signals how much the picture must be delayed.\
674 * extra_delay = repeat_pict / (2*fps)\
675 * - encoding: unused\
676 * - decoding: Set by libavcodec.\
686 * The content of the picture is interlaced.\
687 * - encoding: Set by user.\
688 * - decoding: Set by libavcodec. (default 0)\
690 int interlaced_frame;\
693 * If the content is interlaced, is top field displayed first.\
694 * - encoding: Set by user.\
695 * - decoding: Set by libavcodec.\
697 int top_field_first;\
701 * - encoding: Set by user.\
702 * - decoding: Set by libavcodec.\
704 AVPanScan *pan_scan;\
707 * Tell user application that palette has changed from previous frame.\
708 * - encoding: ??? (no palette-enabled encoder yet)\
709 * - decoding: Set by libavcodec. (default 0).\
711 int palette_has_changed;\
714 * codec suggestion on buffer type if != 0\
715 * - encoding: unused\
716 * - decoding: Set by libavcodec. (before get_buffer() call)).\
722 * - encoding: unused\
723 * - decoding: Set by libavcodec.\
728 * motion referece frame index\
729 * - encoding: Set by user.\
730 * - decoding: Set by libavcodec.\
732 int8_t *ref_index[2];
734 #define FF_QSCALE_TYPE_MPEG1 0
735 #define FF_QSCALE_TYPE_MPEG2 1
736 #define FF_QSCALE_TYPE_H264 2
738 #define FF_BUFFER_TYPE_INTERNAL 1
739 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
740 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
741 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
744 #define FF_I_TYPE 1 // Intra
745 #define FF_P_TYPE 2 // Predicted
746 #define FF_B_TYPE 3 // Bi-dir predicted
747 #define FF_S_TYPE 4 // S(GMC)-VOP MPEG4
751 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
752 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
753 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
754 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
758 * New fields can be added to the end of FF_COMMON_FRAME with minor version
760 * Removal, reordering and changes to existing fields require a major
761 * version bump. No fields should be added into AVFrame before or after
763 * sizeof(AVFrame) must not be used outside libav*.
765 typedef struct AVFrame {
769 #define DEFAULT_FRAME_RATE_BASE 1001000
772 * main external API structure.
773 * New fields can be added to the end with minor version bumps.
774 * Removal, reordering and changes to existing fields require a major
776 * sizeof(AVCodecContext) must not be used outside libav*.
778 typedef struct AVCodecContext {
780 * information on struct for av_log
781 * - set by avcodec_alloc_context
785 * the average bitrate
786 * - encoding: Set by user; unused for constant quantizer encoding.
787 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
792 * number of bits the bitstream is allowed to diverge from the reference.
793 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
794 * - encoding: Set by user; unused for constant quantizer encoding.
797 int bit_rate_tolerance;
801 * - encoding: Set by user.
802 * - decoding: Set by user.
807 * Some codecs need additional format info. It is stored here.
808 * If any muxer uses this then ALL demuxers/parsers AND encoders for the
809 * specific codec MUST set it correctly otherwise stream copy breaks.
810 * In general use of this field by muxers is not recommanded.
811 * - encoding: Set by libavcodec.
812 * - decoding: Set by libavcodec. (FIXME: Is this OK?)
817 * Motion estimation algorithm used for video coding.
818 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
819 * 8 (umh), 9 (iter) [7, 8 are x264 specific, 9 is snow specific]
820 * - encoding: MUST be set by user.
826 * some codecs need / can use extradata like Huffman tables.
827 * mjpeg: Huffman tables
828 * rv10: additional flags
829 * mpeg4: global headers (they can be in the bitstream or here)
830 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
831 * than extradata_size to avoid prolems if it is read with the bitstream reader.
832 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
833 * - encoding: Set/allocated/freed by libavcodec.
834 * - decoding: Set/allocated/freed by user.
840 * This is the fundamental unit of time (in seconds) in terms
841 * of which frame timestamps are represented. For fixed-fps content,
842 * timebase should be 1/framerate and timestamp increments should be
844 * - encoding: MUST be set by user.
845 * - decoding: Set by libavcodec.
847 AVRational time_base;
851 * picture width / height.
852 * - encoding: MUST be set by user.
853 * - decoding: Set by libavcodec.
854 * Note: For compatibility it is possible to set this instead of
855 * coded_width/height before decoding.
859 #define FF_ASPECT_EXTENDED 15
862 * the number of pictures in a group of pictures, or 0 for intra_only
863 * - encoding: Set by user.
869 * Pixel format, see PIX_FMT_xxx.
870 * - encoding: Set by user.
871 * - decoding: Set by libavcodec.
873 enum PixelFormat pix_fmt;
876 * Frame rate emulation. If not zero, the lower layer (i.e. format handler)
877 * has to read frames at native frame rate.
878 * - encoding: Set by user.
884 * If non NULL, 'draw_horiz_band' is called by the libavcodec
885 * decoder to draw a horizontal band. It improves cache usage. Not
886 * all codecs can do that. You must check the codec capabilities
889 * - decoding: Set by user.
890 * @param height the height of the slice
891 * @param y the y position of the slice
892 * @param type 1->top field, 2->bottom field, 3->frame
893 * @param offset offset into the AVFrame.data from which the slice should be read
895 void (*draw_horiz_band)(struct AVCodecContext *s,
896 const AVFrame *src, int offset[4],
897 int y, int type, int height);
900 int sample_rate; ///< samples per second
904 * audio sample format
905 * - encoding: Set by user.
906 * - decoding: Set by libavcodec.
908 enum SampleFormat sample_fmt; ///< sample format, currently unused
910 /* The following data should not be initialized. */
912 * Samples per packet, initialized when calling 'init'.
915 int frame_number; ///< audio or video frame number
916 int real_pict_num; ///< Returns the real picture number of previous encoded frame.
919 * Number of frames the decoded output will be delayed relative to
921 * - encoding: Set by libavcodec.
926 /* - encoding parameters */
927 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
928 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
932 * - encoding: Set by user.
939 * - encoding: Set by user.
945 * maximum quantizer difference between frames
946 * - encoding: Set by user.
952 * maximum number of B-frames between non-B-frames
953 * Note: The output will be delayed by max_b_frames+1 relative to the input.
954 * - encoding: Set by user.
960 * qscale factor between IP and B-frames
961 * - encoding: Set by user.
964 float b_quant_factor;
966 /** obsolete FIXME remove */
968 #define FF_RC_STRATEGY_XVID 1
970 int b_frame_strategy;
975 * - decoding: Set by user. 1-> Skip B-frames, 2-> Skip IDCT/dequant too, 5-> Skip everything except header
976 * @deprecated Deprecated in favor of skip_idct and skip_frame.
980 struct AVCodec *codec;
984 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
985 /* unused, FIXME remove*/
989 int rtp_payload_size; /* The size of the RTP payload: the coder will */
990 /* do its best to deliver a chunk with size */
991 /* below rtp_payload_size, the chunk will start */
992 /* with a start code on some codecs like H.263. */
993 /* This doesn't take account of any particular */
994 /* headers inside the transmitted RTP payload. */
997 /* The RTP callback: This function is called */
998 /* every time the encoder has a packet to send. */
999 /* It depends on the encoder if the data starts */
1000 /* with a Start Code (it should). H.263 does. */
1001 /* mb_nb contains the number of macroblocks */
1002 /* encoded in the RTP payload. */
1003 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
1005 /* statistics, used for 2-pass encoding */
1016 * number of bits used for the previously encoded frame
1017 * - encoding: Set by libavcodec.
1018 * - decoding: unused
1023 * Private data of the user, can be used to carry app specific stuff.
1024 * - encoding: Set by user.
1025 * - decoding: Set by user.
1029 char codec_name[32];
1030 enum CodecType codec_type; /* see CODEC_TYPE_xxx */
1031 enum CodecID codec_id; /* see CODEC_ID_xxx */
1034 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1035 * This is used to work around some encoder bugs.
1036 * A demuxer should set this to what is stored in the field used to identify the codec.
1037 * If there are multiple such fields in a container then the demuxer should choose the one
1038 * which maximizes the information about the used codec.
1039 * If the codec tag field in a container is larger then 32 bits then the demuxer should
1040 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1041 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1043 * - encoding: Set by user, if not then the default based on codec_id will be used.
1044 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1046 unsigned int codec_tag;
1049 * Work around bugs in encoders which sometimes cannot be detected automatically.
1050 * - encoding: Set by user
1051 * - decoding: Set by user
1053 int workaround_bugs;
1054 #define FF_BUG_AUTODETECT 1 ///< autodetection
1055 #define FF_BUG_OLD_MSMPEG4 2
1056 #define FF_BUG_XVID_ILACE 4
1057 #define FF_BUG_UMP4 8
1058 #define FF_BUG_NO_PADDING 16
1059 #define FF_BUG_AMV 32
1060 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
1061 #define FF_BUG_QPEL_CHROMA 64
1062 #define FF_BUG_STD_QPEL 128
1063 #define FF_BUG_QPEL_CHROMA2 256
1064 #define FF_BUG_DIRECT_BLOCKSIZE 512
1065 #define FF_BUG_EDGE 1024
1066 #define FF_BUG_HPEL_CHROMA 2048
1067 #define FF_BUG_DC_CLIP 4096
1068 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
1069 //#define FF_BUG_FAKE_SCALABILITY 16 //Autodetection should work 100%.
1072 * luma single coefficient elimination threshold
1073 * - encoding: Set by user.
1074 * - decoding: unused
1076 int luma_elim_threshold;
1079 * chroma single coeff elimination threshold
1080 * - encoding: Set by user.
1081 * - decoding: unused
1083 int chroma_elim_threshold;
1086 * strictly follow the standard (MPEG4, ...).
1087 * - encoding: Set by user.
1088 * - decoding: unused
1090 int strict_std_compliance;
1091 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to a older more strict version of the spec or reference software.
1092 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
1093 #define FF_COMPLIANCE_NORMAL 0
1094 #define FF_COMPLIANCE_INOFFICIAL -1 ///< Allow inofficial extensions.
1095 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
1098 * qscale offset between IP and B-frames
1099 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1100 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1101 * - encoding: Set by user.
1102 * - decoding: unused
1104 float b_quant_offset;
1107 * Error resilience; higher values will detect more errors but may
1108 * misdetect some more or less valid parts as errors.
1109 * - encoding: unused
1110 * - decoding: Set by user.
1112 int error_resilience;
1113 #define FF_ER_CAREFUL 1
1114 #define FF_ER_COMPLIANT 2
1115 #define FF_ER_AGGRESSIVE 3
1116 #define FF_ER_VERY_AGGRESSIVE 4
1119 * Called at the beginning of each frame to get a buffer for it.
1120 * If pic.reference is set then the frame will be read later by libavcodec.
1121 * avcodec_align_dimensions() should be used to find the required width and
1122 * height, as they normally need to be rounded up to the next multiple of 16.
1123 * - encoding: unused
1124 * - decoding: Set by libavcodec., user can override.
1126 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1129 * Called to release buffers which where allocated with get_buffer.
1130 * A released buffer can be reused in get_buffer().
1131 * pic.data[*] must be set to NULL.
1132 * - encoding: unused
1133 * - decoding: Set by libavcodec., user can override.
1135 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1138 * If 1 the stream has a 1 frame delay during decoding.
1139 * - encoding: Set by libavcodec.
1140 * - decoding: Set by libavcodec.
1145 * number of bytes per packet if constant and known or 0
1146 * Used by some WAV based audio codecs.
1150 int parse_only; /* - decoding only: If true, only parsing is done
1151 (function avcodec_parse_frame()). The frame
1152 data is returned. Only MPEG codecs support this now. */
1155 * 0-> h263 quant 1-> mpeg quant
1156 * - encoding: Set by user.
1157 * - decoding: unused
1162 * pass1 encoding statistics output buffer
1163 * - encoding: Set by libavcodec.
1164 * - decoding: unused
1169 * pass2 encoding statistics input buffer
1170 * Concatenated stuff from stats_out of pass1 should be placed here.
1171 * - encoding: Allocated/set/freed by user.
1172 * - decoding: unused
1177 * ratecontrol qmin qmax limiting method
1178 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
1179 * - encoding: Set by user.
1180 * - decoding: unused
1188 * ratecontrol override, see RcOverride
1189 * - encoding: Allocated/set/freed by user.
1190 * - decoding: unused
1192 RcOverride *rc_override;
1193 int rc_override_count;
1196 * rate control equation
1197 * - encoding: Set by user
1198 * - decoding: unused
1204 * - encoding: Set by user.
1205 * - decoding: unused
1211 * - encoding: Set by user.
1212 * - decoding: unused
1217 * decoder bitstream buffer size
1218 * - encoding: Set by user.
1219 * - decoding: unused
1222 float rc_buffer_aggressivity;
1225 * qscale factor between P and I-frames
1226 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1227 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1228 * - encoding: Set by user.
1229 * - decoding: unused
1231 float i_quant_factor;
1234 * qscale offset between P and I-frames
1235 * - encoding: Set by user.
1236 * - decoding: unused
1238 float i_quant_offset;
1241 * initial complexity for pass1 ratecontrol
1242 * - encoding: Set by user.
1243 * - decoding: unused
1245 float rc_initial_cplx;
1248 * DCT algorithm, see FF_DCT_* below
1249 * - encoding: Set by user.
1250 * - decoding: unused
1253 #define FF_DCT_AUTO 0
1254 #define FF_DCT_FASTINT 1
1255 #define FF_DCT_INT 2
1256 #define FF_DCT_MMX 3
1257 #define FF_DCT_MLIB 4
1258 #define FF_DCT_ALTIVEC 5
1259 #define FF_DCT_FAAN 6
1262 * luminance masking (0-> disabled)
1263 * - encoding: Set by user.
1264 * - decoding: unused
1269 * temporary complexity masking (0-> disabled)
1270 * - encoding: Set by user.
1271 * - decoding: unused
1273 float temporal_cplx_masking;
1276 * spatial complexity masking (0-> disabled)
1277 * - encoding: Set by user.
1278 * - decoding: unused
1280 float spatial_cplx_masking;
1283 * p block masking (0-> disabled)
1284 * - encoding: Set by user.
1285 * - decoding: unused
1290 * darkness masking (0-> disabled)
1291 * - encoding: Set by user.
1292 * - decoding: unused
1297 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
1298 /* for binary compatibility */
1303 * IDCT algorithm, see FF_IDCT_* below.
1304 * - encoding: Set by user.
1305 * - decoding: Set by user.
1308 #define FF_IDCT_AUTO 0
1309 #define FF_IDCT_INT 1
1310 #define FF_IDCT_SIMPLE 2
1311 #define FF_IDCT_SIMPLEMMX 3
1312 #define FF_IDCT_LIBMPEG2MMX 4
1313 #define FF_IDCT_PS2 5
1314 #define FF_IDCT_MLIB 6
1315 #define FF_IDCT_ARM 7
1316 #define FF_IDCT_ALTIVEC 8
1317 #define FF_IDCT_SH4 9
1318 #define FF_IDCT_SIMPLEARM 10
1319 #define FF_IDCT_H264 11
1320 #define FF_IDCT_VP3 12
1321 #define FF_IDCT_IPP 13
1322 #define FF_IDCT_XVIDMMX 14
1323 #define FF_IDCT_CAVS 15
1324 #define FF_IDCT_SIMPLEARMV5TE 16
1325 #define FF_IDCT_SIMPLEARMV6 17
1326 #define FF_IDCT_SIMPLEVIS 18
1327 #define FF_IDCT_WMV2 19
1331 * - encoding: Set by libavcodec.
1332 * - decoding: Set by user (or 0).
1336 * slice offsets in the frame in bytes
1337 * - encoding: Set/allocated by libavcodec.
1338 * - decoding: Set/allocated by user (or NULL).
1343 * error concealment flags
1344 * - encoding: unused
1345 * - decoding: Set by user.
1347 int error_concealment;
1348 #define FF_EC_GUESS_MVS 1
1349 #define FF_EC_DEBLOCK 2
1352 * dsp_mask could be add used to disable unwanted CPU features
1353 * CPU features (i.e. MMX, SSE. ...)
1355 * With the FORCE flag you may instead enable given CPU features.
1356 * (Dangerous: Usable in case of misdetection, improper usage however will
1357 * result into program crash.)
1360 #define FF_MM_FORCE 0x80000000 /* Force usage of selected flags (OR) */
1361 /* lower 16 bits - CPU features */
1362 #define FF_MM_MMX 0x0001 ///< standard MMX
1363 #define FF_MM_3DNOW 0x0004 ///< AMD 3DNOW
1364 #define FF_MM_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
1365 #define FF_MM_SSE 0x0008 ///< SSE functions
1366 #define FF_MM_SSE2 0x0010 ///< PIV SSE2 functions
1367 #define FF_MM_3DNOWEXT 0x0020 ///< AMD 3DNowExt
1368 #define FF_MM_SSE3 0x0040 ///< Prescott SSE3 functions
1369 #define FF_MM_SSSE3 0x0080 ///< Conroe SSSE3 functions
1370 #define FF_MM_IWMMXT 0x0100 ///< XScale IWMMXT
1373 * bits per sample/pixel from the demuxer (needed for huffyuv).
1374 * - encoding: Set by libavcodec.
1375 * - decoding: Set by user.
1377 int bits_per_sample;
1380 * prediction method (needed for huffyuv)
1381 * - encoding: Set by user.
1382 * - decoding: unused
1384 int prediction_method;
1385 #define FF_PRED_LEFT 0
1386 #define FF_PRED_PLANE 1
1387 #define FF_PRED_MEDIAN 2
1390 * sample aspect ratio (0 if unknown)
1391 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1392 * - encoding: Set by user.
1393 * - decoding: Set by libavcodec.
1395 AVRational sample_aspect_ratio;
1398 * the picture in the bitstream
1399 * - encoding: Set by libavcodec.
1400 * - decoding: Set by libavcodec.
1402 AVFrame *coded_frame;
1406 * - encoding: Set by user.
1407 * - decoding: Set by user.
1410 #define FF_DEBUG_PICT_INFO 1
1411 #define FF_DEBUG_RC 2
1412 #define FF_DEBUG_BITSTREAM 4
1413 #define FF_DEBUG_MB_TYPE 8
1414 #define FF_DEBUG_QP 16
1415 #define FF_DEBUG_MV 32
1416 #define FF_DEBUG_DCT_COEFF 0x00000040
1417 #define FF_DEBUG_SKIP 0x00000080
1418 #define FF_DEBUG_STARTCODE 0x00000100
1419 #define FF_DEBUG_PTS 0x00000200
1420 #define FF_DEBUG_ER 0x00000400
1421 #define FF_DEBUG_MMCO 0x00000800
1422 #define FF_DEBUG_BUGS 0x00001000
1423 #define FF_DEBUG_VIS_QP 0x00002000
1424 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1428 * - encoding: Set by user.
1429 * - decoding: Set by user.
1432 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1433 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1434 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1438 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
1439 * - decoding: unused
1444 * minimum MB quantizer
1445 * - encoding: unused
1446 * - decoding: unused
1451 * maximum MB quantizer
1452 * - encoding: unused
1453 * - decoding: unused
1458 * motion estimation comparison function
1459 * - encoding: Set by user.
1460 * - decoding: unused
1464 * subpixel motion estimation comparison function
1465 * - encoding: Set by user.
1466 * - decoding: unused
1470 * macroblock comparison function (not supported yet)
1471 * - encoding: Set by user.
1472 * - decoding: unused
1476 * interlaced DCT comparison function
1477 * - encoding: Set by user.
1478 * - decoding: unused
1481 #define FF_CMP_SAD 0
1482 #define FF_CMP_SSE 1
1483 #define FF_CMP_SATD 2
1484 #define FF_CMP_DCT 3
1485 #define FF_CMP_PSNR 4
1486 #define FF_CMP_BIT 5
1488 #define FF_CMP_ZERO 7
1489 #define FF_CMP_VSAD 8
1490 #define FF_CMP_VSSE 9
1491 #define FF_CMP_NSSE 10
1492 #define FF_CMP_W53 11
1493 #define FF_CMP_W97 12
1494 #define FF_CMP_DCTMAX 13
1495 #define FF_CMP_DCT264 14
1496 #define FF_CMP_CHROMA 256
1499 * ME diamond size & shape
1500 * - encoding: Set by user.
1501 * - decoding: unused
1506 * amount of previous MV predictors (2a+1 x 2a+1 square)
1507 * - encoding: Set by user.
1508 * - decoding: unused
1510 int last_predictor_count;
1513 * prepass for motion estimation
1514 * - encoding: Set by user.
1515 * - decoding: unused
1520 * motion estimation prepass comparison function
1521 * - encoding: Set by user.
1522 * - decoding: unused
1527 * ME prepass diamond size & shape
1528 * - encoding: Set by user.
1529 * - decoding: unused
1535 * - encoding: Set by user.
1536 * - decoding: unused
1538 int me_subpel_quality;
1541 * callback to negotiate the pixelFormat
1542 * @param fmt is the list of formats which are supported by the codec,
1543 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1544 * The first is always the native one.
1545 * @return the chosen format
1546 * - encoding: unused
1547 * - decoding: Set by user, if not set the native format will be chosen.
1549 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1552 * DTG active format information (additional aspect ratio
1553 * information only used in DVB MPEG-2 transport streams)
1556 * - encoding: unused
1557 * - decoding: Set by decoder.
1559 int dtg_active_format;
1560 #define FF_DTG_AFD_SAME 8
1561 #define FF_DTG_AFD_4_3 9
1562 #define FF_DTG_AFD_16_9 10
1563 #define FF_DTG_AFD_14_9 11
1564 #define FF_DTG_AFD_4_3_SP_14_9 13
1565 #define FF_DTG_AFD_16_9_SP_14_9 14
1566 #define FF_DTG_AFD_SP_4_3 15
1569 * maximum motion estimation search range in subpel units
1570 * If 0 then no limit.
1572 * - encoding: Set by user.
1573 * - decoding: unused
1578 * intra quantizer bias
1579 * - encoding: Set by user.
1580 * - decoding: unused
1582 int intra_quant_bias;
1583 #define FF_DEFAULT_QUANT_BIAS 999999
1586 * inter quantizer bias
1587 * - encoding: Set by user.
1588 * - decoding: unused
1590 int inter_quant_bias;
1594 * - encoding: unused
1595 * - decoding: Which clrtable should be used for 8bit RGB images.
1596 * Tables have to be stored somewhere. FIXME
1601 * internal_buffer count
1602 * Don't touch, used by libavcodec default_get_buffer().
1604 int internal_buffer_count;
1608 * Don't touch, used by libavcodec default_get_buffer().
1610 void *internal_buffer;
1612 #define FF_LAMBDA_SHIFT 7
1613 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1614 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1615 #define FF_LAMBDA_MAX (256*128-1)
1617 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1619 * Global quality for codecs which cannot change it per frame.
1620 * This should be proportional to MPEG-1/2/4 qscale.
1621 * - encoding: Set by user.
1622 * - decoding: unused
1626 #define FF_CODER_TYPE_VLC 0
1627 #define FF_CODER_TYPE_AC 1
1628 #define FF_CODER_TYPE_RAW 2
1629 #define FF_CODER_TYPE_RLE 3
1630 #define FF_CODER_TYPE_DEFLATE 4
1633 * - encoding: Set by user.
1634 * - decoding: unused
1640 * - encoding: Set by user.
1641 * - decoding: unused
1647 * - encoding: unused
1648 * - decoding: Set by user.
1650 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1655 * - encoding: unused
1656 * - decoding: Set by user.
1659 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1660 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1661 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1664 * XVideo Motion Acceleration
1665 * - encoding: forbidden
1666 * - decoding: set by decoder
1668 int xvmc_acceleration;
1671 * macroblock decision mode
1672 * - encoding: Set by user.
1673 * - decoding: unused
1676 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1677 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1678 #define FF_MB_DECISION_RD 2 ///< rate distoration
1681 * custom intra quantization matrix
1682 * - encoding: Set by user, can be NULL.
1683 * - decoding: Set by libavcodec.
1685 uint16_t *intra_matrix;
1688 * custom inter quantization matrix
1689 * - encoding: Set by user, can be NULL.
1690 * - decoding: Set by libavcodec.
1692 uint16_t *inter_matrix;
1695 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1696 * This is used to work around some encoder bugs.
1697 * - encoding: unused
1698 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1700 unsigned int stream_codec_tag;
1703 * scene change detection threshold
1704 * 0 is default, larger means fewer detected scene changes.
1705 * - encoding: Set by user.
1706 * - decoding: unused
1708 int scenechange_threshold;
1711 * minimum Lagrange multipler
1712 * - encoding: Set by user.
1713 * - decoding: unused
1718 * maximum Lagrange multipler
1719 * - encoding: Set by user.
1720 * - decoding: unused
1725 * palette control structure
1726 * - encoding: ??? (no palette-enabled encoder yet)
1727 * - decoding: Set by user.
1729 struct AVPaletteControl *palctrl;
1732 * noise reduction strength
1733 * - encoding: Set by user.
1734 * - decoding: unused
1736 int noise_reduction;
1739 * Called at the beginning of a frame to get cr buffer for it.
1740 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1741 * libavcodec will pass previous buffer in pic, function should return
1742 * same buffer or new buffer with old frame "painted" into it.
1743 * If pic.data[0] == NULL must behave like get_buffer().
1744 * - encoding: unused
1745 * - decoding: Set by libavcodec., user can override
1747 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1750 * Number of bits which should be loaded into the rc buffer before decoding starts.
1751 * - encoding: Set by user.
1752 * - decoding: unused
1754 int rc_initial_buffer_occupancy;
1758 * - encoding: Set by user.
1759 * - decoding: unused
1761 int inter_threshold;
1765 * - encoding: Set by user.
1766 * - decoding: Set by user.
1771 * Simulates errors in the bitstream to test error concealment.
1772 * - encoding: Set by user.
1773 * - decoding: unused
1778 * MP3 antialias algorithm, see FF_AA_* below.
1779 * - encoding: unused
1780 * - decoding: Set by user.
1783 #define FF_AA_AUTO 0
1784 #define FF_AA_FASTINT 1 //not implemented yet
1786 #define FF_AA_FLOAT 3
1788 * quantizer noise shaping
1789 * - encoding: Set by user.
1790 * - decoding: unused
1792 int quantizer_noise_shaping;
1796 * is used to decide how many independent tasks should be passed to execute()
1797 * - encoding: Set by user.
1798 * - decoding: Set by user.
1803 * The codec may call this to execute several independent things.
1804 * It will return only after finishing all tasks.
1805 * The user may replace this with some multithreaded implementation,
1806 * the default implementation will execute the parts serially.
1807 * @param count the number of things to execute
1808 * - encoding: Set by libavcodec, user can override.
1809 * - decoding: Set by libavcodec, user can override.
1811 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void **arg2, int *ret, int count);
1815 * Can be used by execute() to store some per AVCodecContext stuff.
1816 * - encoding: set by execute()
1817 * - decoding: set by execute()
1819 void *thread_opaque;
1822 * Motion estimation threshold below which no motion estimation is
1823 * performed, but instead the user specified motion vectors are used.
1825 * - encoding: Set by user.
1826 * - decoding: unused
1831 * Macroblock threshold below which the user specified macroblock types will be used.
1832 * - encoding: Set by user.
1833 * - decoding: unused
1838 * precision of the intra DC coefficient - 8
1839 * - encoding: Set by user.
1840 * - decoding: unused
1842 int intra_dc_precision;
1845 * noise vs. sse weight for the nsse comparsion function
1846 * - encoding: Set by user.
1847 * - decoding: unused
1852 * Number of macroblock rows at the top which are skipped.
1853 * - encoding: unused
1854 * - decoding: Set by user.
1859 * Number of macroblock rows at the bottom which are skipped.
1860 * - encoding: unused
1861 * - decoding: Set by user.
1867 * - encoding: Set by user.
1868 * - decoding: Set by libavcodec.
1871 #define FF_PROFILE_UNKNOWN -99
1872 #define FF_PROFILE_AAC_MAIN 0
1873 #define FF_PROFILE_AAC_LOW 1
1874 #define FF_PROFILE_AAC_SSR 2
1875 #define FF_PROFILE_AAC_LTP 3
1879 * - encoding: Set by user.
1880 * - decoding: Set by libavcodec.
1883 #define FF_LEVEL_UNKNOWN -99
1886 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
1887 * - encoding: unused
1888 * - decoding: Set by user.
1893 * Bitstream width / height, may be different from width/height if lowres
1894 * or other things are used.
1895 * - encoding: unused
1896 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1898 int coded_width, coded_height;
1901 * frame skip threshold
1902 * - encoding: Set by user.
1903 * - decoding: unused
1905 int frame_skip_threshold;
1909 * - encoding: Set by user.
1910 * - decoding: unused
1912 int frame_skip_factor;
1915 * frame skip exponent
1916 * - encoding: Set by user.
1917 * - decoding: unused
1922 * frame skip comparison function
1923 * - encoding: Set by user.
1924 * - decoding: unused
1929 * Border processing masking, raises the quantizer for mbs on the borders
1931 * - encoding: Set by user.
1932 * - decoding: unused
1934 float border_masking;
1937 * minimum MB lagrange multipler
1938 * - encoding: Set by user.
1939 * - decoding: unused
1944 * maximum MB lagrange multipler
1945 * - encoding: Set by user.
1946 * - decoding: unused
1952 * - encoding: Set by user.
1953 * - decoding: unused
1955 int me_penalty_compensation;
1959 * - encoding: unused
1960 * - decoding: Set by user.
1962 enum AVDiscard skip_loop_filter;
1966 * - encoding: unused
1967 * - decoding: Set by user.
1969 enum AVDiscard skip_idct;
1973 * - encoding: unused
1974 * - decoding: Set by user.
1976 enum AVDiscard skip_frame;
1980 * - encoding: Set by user.
1981 * - decoding: unused
1987 * - encoding: Set by user.
1988 * - decoding: unused
1993 * constant rate factor - quality-based VBR - values ~correspond to qps
1994 * - encoding: Set by user.
1995 * - decoding: unused
2000 * constant quantization parameter rate control method
2001 * - encoding: Set by user.
2002 * - decoding: unused
2008 * - encoding: Set by user.
2009 * - decoding: unused
2014 * number of reference frames
2015 * - encoding: Set by user.
2016 * - decoding: unused
2021 * chroma qp offset from luma
2022 * - encoding: Set by user.
2023 * - decoding: unused
2028 * Influences how often B-frames are used.
2029 * - encoding: Set by user.
2030 * - decoding: unused
2035 * trellis RD quantization
2036 * - encoding: Set by user.
2037 * - decoding: unused
2042 * Reduce fluctuations in qp (before curve compression).
2043 * - encoding: Set by user.
2044 * - decoding: unused
2046 float complexityblur;
2049 * in-loop deblocking filter alphac0 parameter
2050 * alpha is in the range -6...6
2051 * - encoding: Set by user.
2052 * - decoding: unused
2057 * in-loop deblocking filter beta parameter
2058 * beta is in the range -6...6
2059 * - encoding: Set by user.
2060 * - decoding: unused
2065 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
2066 * - encoding: Set by user.
2067 * - decoding: unused
2070 #define X264_PART_I4X4 0x001 /* Analyze i4x4 */
2071 #define X264_PART_I8X8 0x002 /* Analyze i8x8 (requires 8x8 transform) */
2072 #define X264_PART_P8X8 0x010 /* Analyze p16x8, p8x16 and p8x8 */
2073 #define X264_PART_P4X4 0x020 /* Analyze p8x4, p4x8, p4x4 */
2074 #define X264_PART_B8X8 0x100 /* Analyze b16x8, b8x16 and b8x8 */
2077 * direct MV prediction mode - 0 (none), 1 (spatial), 2 (temporal)
2078 * - encoding: Set by user.
2079 * - decoding: unused
2084 * Audio cutoff bandwidth (0 means "automatic")
2085 * - encoding: Set by user.
2086 * - decoding: unused
2091 * Multiplied by qscale for each frame and added to scene_change_score.
2092 * - encoding: Set by user.
2093 * - decoding: unused
2095 int scenechange_factor;
2099 * Note: Value depends upon the compare function used for fullpel ME.
2100 * - encoding: Set by user.
2101 * - decoding: unused
2106 * Adjusts sensitivity of b_frame_strategy 1.
2107 * - encoding: Set by user.
2108 * - decoding: unused
2113 * - encoding: Set by user.
2114 * - decoding: unused
2116 int compression_level;
2117 #define FF_COMPRESSION_DEFAULT -1
2120 * Sets whether to use LPC mode - used by FLAC encoder.
2121 * - encoding: Set by user.
2122 * - decoding: unused
2127 * LPC coefficient precision - used by FLAC encoder
2128 * - encoding: Set by user.
2129 * - decoding: unused
2131 int lpc_coeff_precision;
2134 * - encoding: Set by user.
2135 * - decoding: unused
2137 int min_prediction_order;
2140 * - encoding: Set by user.
2141 * - decoding: unused
2143 int max_prediction_order;
2146 * search method for selecting prediction order
2147 * - encoding: Set by user.
2148 * - decoding: unused
2150 int prediction_order_method;
2153 * - encoding: Set by user.
2154 * - decoding: unused
2156 int min_partition_order;
2159 * - encoding: Set by user.
2160 * - decoding: unused
2162 int max_partition_order;
2165 * GOP timecode frame start number, in non drop frame format
2166 * - encoding: Set by user.
2167 * - decoding: unused
2169 int64_t timecode_frame_start;
2172 * Decoder should decode to this many channels if it can (0 for default)
2173 * - encoding: unused
2174 * - decoding: Set by user.
2176 int request_channels;
2179 * Percentage of dynamic range compression to be applied by the decoder.
2180 * The default value is 1.0, corresponding to full compression.
2181 * - encoding: unused
2182 * - decoding: Set by user.
2190 typedef struct AVCodec {
2192 * Name of the codec implementation.
2193 * The name is globally unique among encoders and among decoders (but an
2194 * encoder and a decoder can share the same name).
2195 * This is the primary way to find a codec from the user perspective.
2198 enum CodecType type;
2201 int (*init)(AVCodecContext *);
2202 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2203 int (*close)(AVCodecContext *);
2204 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size,
2205 const uint8_t *buf, int buf_size);
2207 struct AVCodec *next;
2208 void (*flush)(AVCodecContext *);
2209 const AVRational *supported_framerates; ///array of supported framerates, or NULL if any, array is terminated by {0,0}
2210 const enum PixelFormat *pix_fmts; ///array of supported pixel formats, or NULL if unknown, array is terminanted by -1
2214 * four components are given, that's all.
2215 * the last component is alpha
2217 typedef struct AVPicture {
2219 int linesize[4]; ///< number of bytes per line
2224 * This structure defines a method for communicating palette changes
2225 * between and demuxer and a decoder.
2227 * @deprecated Use AVPacket to send palette changes instead.
2228 * This is totally broken.
2230 #define AVPALETTE_SIZE 1024
2231 #define AVPALETTE_COUNT 256
2232 typedef struct AVPaletteControl {
2234 /* Demuxer sets this to 1 to indicate the palette has changed;
2235 * decoder resets to 0. */
2236 int palette_changed;
2238 /* 4-byte ARGB palette entries, stored in native byte order; note that
2239 * the individual palette components should be on a 8-bit scale; if
2240 * the palette data comes from an IBM VGA native format, the component
2241 * data is probably 6 bits in size and needs to be scaled. */
2242 unsigned int palette[AVPALETTE_COUNT];
2244 } AVPaletteControl attribute_deprecated;
2246 typedef struct AVSubtitleRect {
2253 uint32_t *rgba_palette;
2257 typedef struct AVSubtitle {
2258 uint16_t format; /* 0 = graphics */
2259 uint32_t start_display_time; /* relative to packet pts, in ms */
2260 uint32_t end_display_time; /* relative to packet pts, in ms */
2262 AVSubtitleRect *rects;
2268 struct ReSampleContext;
2269 struct AVResampleContext;
2271 typedef struct ReSampleContext ReSampleContext;
2273 ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2274 int output_rate, int input_rate);
2275 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2276 void audio_resample_close(ReSampleContext *s);
2278 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2279 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2280 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2281 void av_resample_close(struct AVResampleContext *c);
2283 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2284 /* YUV420 format is assumed ! */
2287 * @deprecated Use the software scaler (swscale) instead.
2289 typedef struct ImgReSampleContext ImgReSampleContext attribute_deprecated;
2292 * @deprecated Use the software scaler (swscale) instead.
2294 attribute_deprecated ImgReSampleContext *img_resample_init(int output_width, int output_height,
2295 int input_width, int input_height);
2298 * @deprecated Use the software scaler (swscale) instead.
2300 attribute_deprecated ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
2301 int iwidth, int iheight,
2302 int topBand, int bottomBand,
2303 int leftBand, int rightBand,
2304 int padtop, int padbottom,
2305 int padleft, int padright);
2308 * @deprecated Use the software scaler (swscale) instead.
2310 attribute_deprecated void img_resample(struct ImgReSampleContext *s,
2311 AVPicture *output, const AVPicture *input);
2314 * @deprecated Use the software scaler (swscale) instead.
2316 attribute_deprecated void img_resample_close(struct ImgReSampleContext *s);
2321 * Allocate memory for a picture. Call avpicture_free to free it.
2323 * @param picture the picture to be filled in
2324 * @param pix_fmt the format of the picture
2325 * @param width the width of the picture
2326 * @param height the height of the picture
2327 * @return zero if successful, a negative value if not
2329 int avpicture_alloc(AVPicture *picture, int pix_fmt, int width, int height);
2332 * Free a picture previously allocated by avpicture_alloc().
2334 * @param picture the AVPicture to be freed
2336 void avpicture_free(AVPicture *picture);
2339 * Fill in the AVPicture fields.
2340 * The fields of the given AVPicture are filled in by using the 'ptr' address
2341 * which points to the image data buffer. Depending on the specified picture
2342 * format, one or multiple image data pointers and line sizes will be set.
2343 * If a planar format is specified, several pointers will be set pointing to
2344 * the different picture planes and the line sizes of the different planes
2345 * will be stored in the lines_sizes array.
2347 * @param picture AVPicture whose fields are to be filled in
2348 * @param ptr Buffer which will contain or contains the actual image data
2349 * @param pix_fmt The format in which the picture data is stored.
2350 * @param width the width of the image in pixels
2351 * @param height the height of the image in pixels
2352 * @return size of the image data in bytes
2354 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2355 int pix_fmt, int width, int height);
2356 int avpicture_layout(const AVPicture* src, int pix_fmt, int width, int height,
2357 unsigned char *dest, int dest_size);
2360 * Calculate the size in bytes that a picture of the given width and height
2361 * would occupy if stored in the given picture format.
2363 * @param pix_fmt the given picture format
2364 * @param width the width of the image
2365 * @param height the height of the image
2366 * @return Image data size in bytes
2368 int avpicture_get_size(int pix_fmt, int width, int height);
2369 void avcodec_get_chroma_sub_sample(int pix_fmt, int *h_shift, int *v_shift);
2370 const char *avcodec_get_pix_fmt_name(int pix_fmt);
2371 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2372 enum PixelFormat avcodec_get_pix_fmt(const char* name);
2373 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);
2375 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
2376 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
2377 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
2378 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
2379 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
2380 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
2383 * Computes what kind of losses will occur when converting from one specific
2384 * pixel format to another.
2385 * When converting from one pixel format to another, information loss may occur.
2386 * For example, when converting from RGB24 to GRAY, the color information will
2387 * be lost. Similarly, other losses occur when converting from some formats to
2388 * other formats. These losses can involve loss of chroma, but also loss of
2389 * resolution, loss of color depth, loss due to the color space conversion, loss
2390 * of the alpha bits or loss due to color quantization.
2391 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
2392 * which will occur when converting from one pixel format to another.
2394 * @param[in] dst_pix_fmt destination pixel format
2395 * @param[in] src_pix_fmt source pixel format
2396 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2397 * @return Combination of flags informing you what kind of losses will occur.
2399 int avcodec_get_pix_fmt_loss(int dst_pix_fmt, int src_pix_fmt,
2403 * Finds the best pixel format to convert to given a certain source pixel
2404 * format. When converting from one pixel format to another, information loss
2405 * may occur. For example, when converting from RGB24 to GRAY, the color
2406 * information will be lost. Similarly, other losses occur when converting from
2407 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
2408 * the given pixel formats should be used to suffer the least amount of loss.
2409 * The pixel formats from which it chooses one, are determined by the
2410 * \p pix_fmt_mask parameter.
2413 * src_pix_fmt = PIX_FMT_YUV420P;
2414 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
2415 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
2418 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
2419 * @param[in] src_pix_fmt source pixel format
2420 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
2421 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
2422 * @return The best pixel format to convert to or -1 if none was found.
2424 int avcodec_find_best_pix_fmt(int pix_fmt_mask, int src_pix_fmt,
2425 int has_alpha, int *loss_ptr);
2429 * Print in buf the string corresponding to the pixel format with
2430 * number pix_fmt, or an header if pix_fmt is negative.
2432 * @param[in] buf the buffer where to write the string
2433 * @param[in] buf_size the size of buf
2434 * @param[in] pix_fmt the number of the pixel format to print the corresponding info string, or
2435 * a negative value to print the corresponding header.
2436 * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
2438 void avcodec_pix_fmt_string (char *buf, int buf_size, int pix_fmt);
2440 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
2441 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
2444 * Tell if an image really has transparent alpha values.
2445 * @return ored mask of FF_ALPHA_xxx constants
2447 int img_get_alpha_info(const AVPicture *src,
2448 int pix_fmt, int width, int height);
2450 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2452 * convert among pixel formats
2453 * @deprecated Use the software scaler (swscale) instead.
2455 attribute_deprecated int img_convert(AVPicture *dst, int dst_pix_fmt,
2456 const AVPicture *src, int pix_fmt,
2457 int width, int height);
2460 /* deinterlace a picture */
2461 /* deinterlace - if not supported return -1 */
2462 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
2463 int pix_fmt, int width, int height);
2465 /* external high level API */
2467 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2468 extern AVCodec *first_avcodec;
2470 AVCodec *av_codec_next(AVCodec *c);
2472 /* returns LIBAVCODEC_VERSION_INT constant */
2473 unsigned avcodec_version(void);
2474 /* returns LIBAVCODEC_BUILD constant */
2475 unsigned avcodec_build(void);
2478 * Initializes libavcodec.
2480 * @warning This function \e must be called before any other libavcodec
2483 void avcodec_init(void);
2485 void register_avcodec(AVCodec *format);
2488 * Finds a registered encoder with a matching codec ID.
2490 * @param id CodecID of the requested encoder
2491 * @return An encoder if one was found, NULL otherwise.
2493 AVCodec *avcodec_find_encoder(enum CodecID id);
2496 * Finds a registered encoder with the specified name.
2498 * @param name name of the requested encoder
2499 * @return An encoder if one was found, NULL otherwise.
2501 AVCodec *avcodec_find_encoder_by_name(const char *name);
2504 * Finds a registered decoder with a matching codec ID.
2506 * @param id CodecID of the requested decoder
2507 * @return A decoder if one was found, NULL otherwise.
2509 AVCodec *avcodec_find_decoder(enum CodecID id);
2512 * Finds a registered decoder with the specified name.
2514 * @param name name of the requested decoder
2515 * @return A decoder if one was found, NULL otherwise.
2517 AVCodec *avcodec_find_decoder_by_name(const char *name);
2518 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
2521 * Sets the fields of the given AVCodecContext to default values.
2523 * @param s The AVCodecContext of which the fields should be set to default values.
2525 void avcodec_get_context_defaults(AVCodecContext *s);
2527 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2528 * we WILL change its arguments and name a few times! */
2529 void avcodec_get_context_defaults2(AVCodecContext *s, enum CodecType);
2532 * Allocates an AVCodecContext and sets its fields to default values. The
2533 * resulting struct can be deallocated by simply calling av_free().
2535 * @return An AVCodecContext filled with default values or NULL on failure.
2536 * @see avcodec_get_context_defaults
2538 AVCodecContext *avcodec_alloc_context(void);
2540 /** THIS FUNCTION IS NOT YET PART OF THE PUBLIC API!
2541 * we WILL change its arguments and name a few times! */
2542 AVCodecContext *avcodec_alloc_context2(enum CodecType);
2545 * Sets the fields of the given AVFrame to default values.
2547 * @param pic The AVFrame of which the fields should be set to default values.
2549 void avcodec_get_frame_defaults(AVFrame *pic);
2552 * Allocates an AVFrame and sets its fields to default values. The resulting
2553 * struct can be deallocated by simply calling av_free().
2555 * @return An AVFrame filled with default values or NULL on failure.
2556 * @see avcodec_get_frame_defaults
2558 AVFrame *avcodec_alloc_frame(void);
2560 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
2561 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
2562 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
2563 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
2566 * Checks if the given dimension of a picture is valid, meaning that all
2567 * bytes of the picture can be addressed with a signed int.
2569 * @param[in] w Width of the picture.
2570 * @param[in] h Height of the picture.
2571 * @return Zero if valid, a negative value if invalid.
2573 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
2574 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
2576 int avcodec_thread_init(AVCodecContext *s, int thread_count);
2577 void avcodec_thread_free(AVCodecContext *s);
2578 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2579 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2580 //FIXME func typedef
2583 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
2584 * function the context has to be allocated.
2586 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2587 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2588 * retrieving a codec.
2590 * @warning This function is not thread safe!
2593 * avcodec_register_all();
2594 * codec = avcodec_find_decoder(CODEC_ID_H264);
2598 * context = avcodec_alloc_context();
2600 * if (avcodec_open(context, codec) < 0)
2604 * @param avctx The context which will be set up to use the given codec.
2605 * @param codec The codec to use within the context.
2606 * @return zero on success, a negative value on error
2607 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
2609 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
2612 * @deprecated Use avcodec_decode_audio2() instead.
2614 attribute_deprecated int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
2615 int *frame_size_ptr,
2616 const uint8_t *buf, int buf_size);
2619 * Decodes an audio frame from \p buf into \p samples.
2620 * The avcodec_decode_audio2() function decodes an audio frame from the input
2621 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2622 * audio codec which was coupled with \p avctx using avcodec_open(). The
2623 * resulting decoded frame is stored in output buffer \p samples. If no frame
2624 * could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
2625 * decompressed frame size in \e bytes.
2627 * @warning You \e must set \p frame_size_ptr to the allocated size of the
2628 * output buffer before calling avcodec_decode_audio2().
2630 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2631 * the actual read bytes because some optimized bitstream readers read 32 or 64
2632 * bits at once and could read over the end.
2634 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2635 * no overreading happens for damaged MPEG streams.
2637 * @note You might have to align the input buffer \p buf and output buffer \p
2638 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
2639 * necessary at all, on others it won't work at all if not aligned and on others
2640 * it will work but it will have an impact on performance. In practice, the
2641 * bitstream should have 4 byte alignment at minimum and all sample data should
2642 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2643 * the linesize is not a multiple of 16 then there's no sense in aligning the
2644 * start of the buffer to 16.
2646 * @param avctx the codec context
2647 * @param[out] samples the output buffer
2648 * @param[in,out] frame_size_ptr the output buffer size in bytes
2649 * @param[in] buf the input buffer
2650 * @param[in] buf_size the input buffer size in bytes
2651 * @return On error a negative value is returned, otherwise the number of bytes
2652 * used or zero if no frame could be decompressed.
2654 int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
2655 int *frame_size_ptr,
2656 const uint8_t *buf, int buf_size);
2659 * Decodes a video frame from \p buf into \p picture.
2660 * The avcodec_decode_video() function decodes a video frame from the input
2661 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2662 * video codec which was coupled with \p avctx using avcodec_open(). The
2663 * resulting decoded frame is stored in \p picture.
2665 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2666 * the actual read bytes because some optimized bitstream readers read 32 or 64
2667 * bits at once and could read over the end.
2669 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2670 * no overreading happens for damaged MPEG streams.
2672 * @note You might have to align the input buffer \p buf and output buffer \p
2673 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
2674 * necessary at all, on others it won't work at all if not aligned and on others
2675 * it will work but it will have an impact on performance. In practice, the
2676 * bitstream should have 4 byte alignment at minimum and all sample data should
2677 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2678 * the linesize is not a multiple of 16 then there's no sense in aligning the
2679 * start of the buffer to 16.
2681 * @param avctx the codec context
2682 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
2683 * @param[in] buf the input buffer
2684 * @param[in] buf_size the size of the input buffer in bytes
2685 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
2686 * @return On error a negative value is returned, otherwise the number of bytes
2687 * used or zero if no frame could be decompressed.
2689 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
2690 int *got_picture_ptr,
2691 const uint8_t *buf, int buf_size);
2693 /* Decode a subtitle message. Return -1 if error, otherwise return the
2694 * number of bytes used. If no subtitle could be decompressed,
2695 * got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
2696 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
2698 const uint8_t *buf, int buf_size);
2699 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
2701 uint8_t *buf, int buf_size);
2704 * Encodes an audio frame from \p samples into \p buf.
2705 * The avcodec_encode_audio() function encodes an audio frame from the input
2706 * buffer \p samples. To encode it, it makes use of the audio codec which was
2707 * coupled with \p avctx using avcodec_open(). The resulting encoded frame is
2708 * stored in output buffer \p buf.
2710 * @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
2712 * @param avctx the codec context
2713 * @param[out] buf the output buffer
2714 * @param[in] buf_size the output buffer size
2715 * @param[in] samples the input buffer containing the samples
2716 * The number of samples read from this buffer is frame_size*channels,
2717 * both of which are defined in \p avctx.
2718 * @return On error a negative value is returned, on success zero or the number
2719 * of bytes used to encode the data read from the input buffer.
2721 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2722 const short *samples);
2725 * Encodes a video frame from \p pict into \p buf.
2726 * The avcodec_encode_video() function encodes a video frame from the input
2727 * \p pict. To encode it, it makes use of the video codec which was coupled with
2728 * \p avctx using avcodec_open(). The resulting encoded bytes representing the
2729 * frame are stored in the output buffer \p buf. The input picture should be
2730 * stored using a specific format, namely \c avctx.pix_fmt.
2732 * @param avctx the codec context
2733 * @param[out] buf the output buffer for the bitstream of encoded frame
2734 * @param[in] buf_size the size of the output buffer in bytes
2735 * @param[in] pict the input picture to encode
2736 * @return On error a negative value is returned, on success zero or the number
2737 * of bytes used from the input buffer.
2739 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2740 const AVFrame *pict);
2741 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2742 const AVSubtitle *sub);
2744 int avcodec_close(AVCodecContext *avctx);
2746 void avcodec_register_all(void);
2749 * Flush buffers, should be called when seeking or when switching to a different stream.
2751 void avcodec_flush_buffers(AVCodecContext *avctx);
2753 void avcodec_default_free_buffers(AVCodecContext *s);
2755 /* misc useful functions */
2758 * Returns a single letter to describe the given picture type \p pict_type.
2760 * @param[in] pict_type the picture type
2761 * @return A single character representing the picture type.
2763 char av_get_pict_type_char(int pict_type);
2766 * Returns codec bits per sample.
2768 * @param[in] codec_id the codec
2769 * @return Number of bits per sample or zero if unknown for the given codec.
2771 int av_get_bits_per_sample(enum CodecID codec_id);
2774 * Returns sample format bits per sample.
2776 * @param[in] sample_fmt the sample format
2777 * @return Number of bits per sample or zero if unknown for the given sample format.
2779 int av_get_bits_per_sample_format(enum SampleFormat sample_fmt);
2782 typedef struct AVCodecParserContext {
2784 struct AVCodecParser *parser;
2785 int64_t frame_offset; /* offset of the current frame */
2786 int64_t cur_offset; /* current offset
2787 (incremented by each av_parser_parse()) */
2788 int64_t last_frame_offset; /* offset of the last frame */
2790 int pict_type; /* XXX: Put it back in AVCodecContext. */
2791 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
2792 int64_t pts; /* pts of the current frame */
2793 int64_t dts; /* dts of the current frame */
2798 int fetch_timestamp;
2800 #define AV_PARSER_PTS_NB 4
2801 int cur_frame_start_index;
2802 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
2803 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
2804 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
2807 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
2809 int64_t offset; ///< byte offset from starting packet start
2810 int64_t last_offset;
2811 } AVCodecParserContext;
2813 typedef struct AVCodecParser {
2814 int codec_ids[5]; /* several codec IDs are permitted */
2816 int (*parser_init)(AVCodecParserContext *s);
2817 int (*parser_parse)(AVCodecParserContext *s,
2818 AVCodecContext *avctx,
2819 const uint8_t **poutbuf, int *poutbuf_size,
2820 const uint8_t *buf, int buf_size);
2821 void (*parser_close)(AVCodecParserContext *s);
2822 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
2823 struct AVCodecParser *next;
2826 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2827 extern AVCodecParser *av_first_parser;
2829 AVCodecParser *av_parser_next(AVCodecParser *c);
2831 void av_register_codec_parser(AVCodecParser *parser);
2832 AVCodecParserContext *av_parser_init(int codec_id);
2833 int av_parser_parse(AVCodecParserContext *s,
2834 AVCodecContext *avctx,
2835 uint8_t **poutbuf, int *poutbuf_size,
2836 const uint8_t *buf, int buf_size,
2837 int64_t pts, int64_t dts);
2838 int av_parser_change(AVCodecParserContext *s,
2839 AVCodecContext *avctx,
2840 uint8_t **poutbuf, int *poutbuf_size,
2841 const uint8_t *buf, int buf_size, int keyframe);
2842 void av_parser_close(AVCodecParserContext *s);
2845 typedef struct AVBitStreamFilterContext {
2847 struct AVBitStreamFilter *filter;
2848 AVCodecParserContext *parser;
2849 struct AVBitStreamFilterContext *next;
2850 } AVBitStreamFilterContext;
2853 typedef struct AVBitStreamFilter {
2856 int (*filter)(AVBitStreamFilterContext *bsfc,
2857 AVCodecContext *avctx, const char *args,
2858 uint8_t **poutbuf, int *poutbuf_size,
2859 const uint8_t *buf, int buf_size, int keyframe);
2860 void (*close)(AVBitStreamFilterContext *bsfc);
2861 struct AVBitStreamFilter *next;
2862 } AVBitStreamFilter;
2864 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
2865 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
2866 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
2867 AVCodecContext *avctx, const char *args,
2868 uint8_t **poutbuf, int *poutbuf_size,
2869 const uint8_t *buf, int buf_size, int keyframe);
2870 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
2872 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
2877 * Reallocates the given block if it is not large enough, otherwise it
2882 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
2884 /* for static data only */
2887 * Frees all static arrays and resets their pointers to 0.
2888 * Call this function to release all statically allocated tables.
2890 * @deprecated. Code which uses av_free_static is broken/misdesigned
2891 * and should correctly use static arrays
2894 attribute_deprecated void av_free_static(void);
2897 * Allocation of static arrays.
2899 * @warning Do not use for normal allocation.
2901 * @param[in] size The amount of memory you need in bytes.
2902 * @return block of memory of the requested size
2903 * @deprecated. Code which uses av_mallocz_static is broken/misdesigned
2904 * and should correctly use static arrays
2906 attribute_deprecated void *av_mallocz_static(unsigned int size);
2909 * Copy image 'src' to 'dst'.
2911 void av_picture_copy(AVPicture *dst, const AVPicture *src,
2912 int pix_fmt, int width, int height);
2915 * Crop image top and left side.
2917 int av_picture_crop(AVPicture *dst, const AVPicture *src,
2918 int pix_fmt, int top_band, int left_band);
2923 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
2924 int padtop, int padbottom, int padleft, int padright, int *color);
2926 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2928 * @deprecated Use the software scaler (swscale) instead.
2930 attribute_deprecated void img_copy(AVPicture *dst, const AVPicture *src,
2931 int pix_fmt, int width, int height);
2934 * @deprecated Use the software scaler (swscale) instead.
2936 attribute_deprecated int img_crop(AVPicture *dst, const AVPicture *src,
2937 int pix_fmt, int top_band, int left_band);
2940 * @deprecated Use the software scaler (swscale) instead.
2942 attribute_deprecated int img_pad(AVPicture *dst, const AVPicture *src, int height, int width, int pix_fmt,
2943 int padtop, int padbottom, int padleft, int padright, int *color);
2946 extern unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
2949 * Parses \p str and put in \p width_ptr and \p height_ptr the detected values.
2951 * @return 0 in case of a successful parsing, a negative value otherwise
2952 * @param[in] str the string to parse: it has to be a string in the format
2953 * <width>x<height> or a valid video frame size abbreviation.
2954 * @param[in,out] width_ptr pointer to the variable which will contain the detected
2956 * @param[in,out] height_ptr pointer to the variable which will contain the detected
2957 * frame height value
2959 int av_parse_video_frame_size(int *width_ptr, int *height_ptr, const char *str);
2962 * Parses \p str and put in \p frame_rate the detected values.
2964 * @return 0 in case of a successful parsing, a negative value otherwise
2965 * @param[in] str the string to parse: it has to be a string in the format
2966 * <frame_rate_nom>/<frame_rate_den>, a float number or a valid video rate abbreviation
2967 * @param[in,out] frame_rate pointer to the AVRational which will contain the detected
2970 int av_parse_video_frame_rate(AVRational *frame_rate, const char *str);
2972 /* error handling */
2974 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
2975 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
2977 /* Some platforms have E* and errno already negated. */
2978 #define AVERROR(e) (e)
2979 #define AVUNERROR(e) (e)
2981 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
2982 #define AVERROR_IO AVERROR(EIO) /**< I/O error */
2983 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< Number syntax expected in filename. */
2984 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
2985 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
2986 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
2987 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< Operation not supported. */
2988 #define AVERROR_NOENT AVERROR(ENOENT) /**< No such file or directory. */
2989 #define AVERROR_PATCHWELCOME -MKTAG('P','A','W','E') /**< Not yet implemented in FFmpeg. Patches welcome. */
2991 #endif /* FFMPEG_AVCODEC_H */