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
26 * external api header.
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)+(34<<8)+0)
41 #define LIBAVCODEC_VERSION 51.34.0
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}
53 CODEC_ID_MPEG2VIDEO, /* prefered ID for MPEG Video 1 or 2 decoding */
54 CODEC_ID_MPEG2VIDEO_XVMC,
91 CODEC_ID_INTERPLAY_VIDEO,
103 CODEC_ID_TRUEMOTION1,
131 CODEC_ID_TRUEMOTION2,
148 CODEC_ID_DSICINVIDEO,
149 CODEC_ID_TIERTEXSEQVIDEO,
154 /* various pcm "codecs" */
155 CODEC_ID_PCM_S16LE= 0x10000,
171 CODEC_ID_PCM_S24DAUD,
173 /* various adpcm codecs */
174 CODEC_ID_ADPCM_IMA_QT= 0x11000,
175 CODEC_ID_ADPCM_IMA_WAV,
176 CODEC_ID_ADPCM_IMA_DK3,
177 CODEC_ID_ADPCM_IMA_DK4,
178 CODEC_ID_ADPCM_IMA_WS,
179 CODEC_ID_ADPCM_IMA_SMJPEG,
188 CODEC_ID_ADPCM_YAMAHA,
189 CODEC_ID_ADPCM_SBPRO_4,
190 CODEC_ID_ADPCM_SBPRO_3,
191 CODEC_ID_ADPCM_SBPRO_2,
194 CODEC_ID_AMR_NB= 0x12000,
197 /* RealAudio codecs*/
198 CODEC_ID_RA_144= 0x13000,
201 /* various DPCM codecs */
202 CODEC_ID_ROQ_DPCM= 0x14000,
203 CODEC_ID_INTERPLAY_DPCM,
207 CODEC_ID_MP2= 0x15000,
208 CODEC_ID_MP3, /* prefered ID for MPEG Audio layer 1, 2 or3 decoding */
210 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
229 CODEC_ID_WESTWOOD_SND1,
230 CODEC_ID_GSM, /* As in Berlin toast format */
238 CODEC_ID_DSICINAUDIO,
242 CODEC_ID_GSM_MS, /* As found in WAV */
244 /* subtitle codecs */
245 CODEC_ID_DVD_SUBTITLE= 0x17000,
246 CODEC_ID_DVB_SUBTITLE,
248 CODEC_ID_MPEG2TS= 0x20000, /* _FAKE_ codec to indicate a raw MPEG2 transport
249 stream (only used by libavformat) */
252 /* CODEC_ID_MP3LAME is absolete */
253 #define CODEC_ID_MP3LAME CODEC_ID_MP3
256 CODEC_TYPE_UNKNOWN = -1,
263 /* currently unused, may be used if 24/32 bits samples ever supported */
264 /* all in native endian */
266 SAMPLE_FMT_NONE = -1,
267 SAMPLE_FMT_U8, ///< unsigned 8 bits
268 SAMPLE_FMT_S16, ///< signed 16 bits
269 SAMPLE_FMT_S24, ///< signed 24 bits
270 SAMPLE_FMT_S32, ///< signed 32 bits
271 SAMPLE_FMT_FLT, ///< float
275 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
278 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
279 * this is mainly needed because some optimized bitstream readers read
280 * 32 or 64 bit at once and could read over the end<br>
281 * Note, if the first 23 bits of the additional bytes are not 0 then damaged
282 * MPEG bitstreams could cause overread and segfault
284 #define FF_INPUT_BUFFER_PADDING_SIZE 8
287 * minimum encoding buffer size.
288 * used to avoid some checks during header writing
290 #define FF_MIN_BUFFER_SIZE 16384
292 /* motion estimation type, EPZS by default */
306 //we leave some space between them for extensions (drop some keyframes for intra only or drop just some bidir frames)
307 AVDISCARD_NONE =-16, ///< discard nothing
308 AVDISCARD_DEFAULT= 0, ///< discard useless packets like 0 size packets in avi
309 AVDISCARD_NONREF = 8, ///< discard all non reference
310 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
311 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
312 AVDISCARD_ALL = 48, ///< discard all
315 typedef struct RcOverride{
318 int qscale; // if this is 0 then quality_factor will be used instead
319 float quality_factor;
322 #define FF_MAX_B_FRAMES 16
325 these flags can be passed in AVCodecContext.flags before initing
326 Note: not everything is supported yet.
329 #define CODEC_FLAG_QSCALE 0x0002 ///< use fixed qscale
330 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / Advanced prediction for H263
331 #define CODEC_FLAG_QPEL 0x0010 ///< use qpel MC
332 #define CODEC_FLAG_GMC 0x0020 ///< use GMC
333 #define CODEC_FLAG_MV0 0x0040 ///< always try a MB with MV=<0,0>
334 #define CODEC_FLAG_PART 0x0080 ///< use data partitioning
335 /* parent program guarantees that the input for b-frame containing streams is not written to
336 for at least s->max_b_frames+1 frames, if this is not set than the input will be copied */
337 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
338 #define CODEC_FLAG_PASS1 0x0200 ///< use internal 2pass ratecontrol in first pass mode
339 #define CODEC_FLAG_PASS2 0x0400 ///< use internal 2pass ratecontrol in second pass mode
340 #define CODEC_FLAG_EXTERN_HUFF 0x1000 ///< use external huffman table (for mjpeg)
341 #define CODEC_FLAG_GRAY 0x2000 ///< only decode/encode grayscale
342 #define CODEC_FLAG_EMU_EDGE 0x4000///< don't draw edges
343 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding
344 #define CODEC_FLAG_TRUNCATED 0x00010000 /** input bitstream might be truncated at a random location instead
345 of only at frame boundaries */
346 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< normalize adaptive quantization
347 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< use interlaced dct
348 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< force low delay
349 #define CODEC_FLAG_ALT_SCAN 0x00100000 ///< use alternate scan
350 #define CODEC_FLAG_TRELLIS_QUANT 0x00200000 ///< use trellis quantization
351 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< place global headers in extradata instead of every keyframe
352 #define CODEC_FLAG_BITEXACT 0x00800000 ///< use only bitexact stuff (except (i)dct)
353 /* Fx : Flag for h263+ extra options */
354 #define CODEC_FLAG_H263P_AIC 0x01000000 ///< H263 Advanced intra coding / MPEG4 AC prediction (remove this)
355 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H263 Advanced intra coding / MPEG4 AC prediction
356 #define CODEC_FLAG_H263P_UMV 0x02000000 ///< Unlimited motion vector
357 #define CODEC_FLAG_CBP_RD 0x04000000 ///< use rate distortion optimization for cbp
358 #define CODEC_FLAG_QP_RD 0x08000000 ///< use rate distortion optimization for qp selectioon
359 #define CODEC_FLAG_H263P_AIV 0x00000008 ///< H263 Alternative inter vlc
360 #define CODEC_FLAG_OBMC 0x00000001 ///< OBMC
361 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
362 #define CODEC_FLAG_H263P_SLICE_STRUCT 0x10000000
363 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
364 #define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< will reserve space for SVCD scan offset user data
365 #define CODEC_FLAG_CLOSED_GOP ((int)0x80000000)
366 #define CODEC_FLAG2_FAST 0x00000001 ///< allow non spec compliant speedup tricks
367 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< strictly enforce GOP size
368 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< skip bitstream encoding
369 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< place global headers at every keyframe instead of in extradata
370 #define CODEC_FLAG2_BPYRAMID 0x00000010 ///< H.264 allow b-frames to be used as references
371 #define CODEC_FLAG2_WPRED 0x00000020 ///< H.264 weighted biprediction for b-frames
372 #define CODEC_FLAG2_MIXED_REFS 0x00000040 ///< H.264 one reference per partition, as opposed to one reference per macroblock
373 #define CODEC_FLAG2_8X8DCT 0x00000080 ///< H.264 high profile 8x8 transform
374 #define CODEC_FLAG2_FASTPSKIP 0x00000100 ///< H.264 fast pskip
375 #define CODEC_FLAG2_AUD 0x00000200 ///< H.264 access unit delimiters
376 #define CODEC_FLAG2_BRDO 0x00000400 ///< b-frame rate-distortion optimization
377 #define CODEC_FLAG2_INTRA_VLC 0x00000800 ///< use MPEG-2 intra VLC table
378 #define CODEC_FLAG2_MEMC_ONLY 0x00001000 ///< only do ME/MC (I frames -> ref, P frame -> ME+MC)
379 #define CODEC_FLAG2_DROP_FRAME_TIMECODE 0x00002000 ///< timecode is in drop frame format
380 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skiping
382 /* Unsupported options :
383 * Syntax Arithmetic coding (SAC)
384 * Reference Picture Selection
385 * Independant Segment Decoding */
387 /* codec capabilities */
389 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< decoder can use draw_horiz_band callback
391 * Codec uses get_buffer() for allocating buffers.
392 * direct rendering method 1
394 #define CODEC_CAP_DR1 0x0002
395 /* if 'parse_only' field is true, then avcodec_parse_frame() can be
397 #define CODEC_CAP_PARSE_ONLY 0x0004
398 #define CODEC_CAP_TRUNCATED 0x0008
399 /* codec can export data for HW decoding (XvMC) */
400 #define CODEC_CAP_HWACCEL 0x0010
402 * codec has a non zero delay and needs to be feeded with NULL at the end to get the delayed data.
403 * if this is not set, the codec is guaranteed to never be feeded with NULL data
405 #define CODEC_CAP_DELAY 0x0020
407 * Codec can be fed a final frame with a smaller size.
408 * This can be used to prevent truncation of the last audio samples.
410 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
412 //the following defines may change, don't expect compatibility if you use them
413 #define MB_TYPE_INTRA4x4 0x0001
414 #define MB_TYPE_INTRA16x16 0x0002 //FIXME h264 specific
415 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME h264 specific
416 #define MB_TYPE_16x16 0x0008
417 #define MB_TYPE_16x8 0x0010
418 #define MB_TYPE_8x16 0x0020
419 #define MB_TYPE_8x8 0x0040
420 #define MB_TYPE_INTERLACED 0x0080
421 #define MB_TYPE_DIRECT2 0x0100 //FIXME
422 #define MB_TYPE_ACPRED 0x0200
423 #define MB_TYPE_GMC 0x0400
424 #define MB_TYPE_SKIP 0x0800
425 #define MB_TYPE_P0L0 0x1000
426 #define MB_TYPE_P1L0 0x2000
427 #define MB_TYPE_P0L1 0x4000
428 #define MB_TYPE_P1L1 0x8000
429 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
430 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
431 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
432 #define MB_TYPE_QUANT 0x00010000
433 #define MB_TYPE_CBP 0x00020000
434 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
438 * this specifies the area which should be displayed. Note there may be multiple such areas for one frame
440 typedef struct AVPanScan{
443 * - encoding: set by user.
444 * - decoding: set by lavc
449 * width and height in 1/16 pel
450 * - encoding: set by user.
451 * - decoding: set by lavc
457 * position of the top left corner in 1/16 pel for up to 3 fields/frames.
458 * - encoding: set by user.
459 * - decoding: set by lavc
461 int16_t position[3][2];
464 #define FF_COMMON_FRAME \
466 * pointer to the picture planes.\
467 * this might be different from the first allocated byte\
474 * pointer to the first allocated byte of the picture. can be used in get_buffer/release_buffer\
475 * this isn't used by lavc unless the default get/release_buffer() is used\
481 * 1 -> keyframe, 0-> not\
482 * - encoding: set by lavc\
483 * - decoding: set by lavc\
488 * picture type of the frame, see ?_TYPE below.\
489 * - encoding: set by lavc for coded_picture (and set by user for input)\
490 * - decoding: set by lavc\
495 * presentation timestamp in time_base units (time when frame should be shown to user)\
496 * if AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed\
497 * - encoding: MUST be set by user\
498 * - decoding: set by lavc\
503 * picture number in bitstream order.\
504 * - encoding: set by\
505 * - decoding: set by lavc\
507 int coded_picture_number;\
509 * picture number in display order.\
510 * - encoding: set by\
511 * - decoding: set by lavc\
513 int display_picture_number;\
516 * quality (between 1 (good) and FF_LAMBDA_MAX (bad)) \
517 * - encoding: set by lavc for coded_picture (and set by user for input)\
518 * - decoding: set by lavc\
523 * buffer age (1->was last buffer and dint change, 2->..., ...).\
524 * set to INT_MAX if the buffer has not been used yet \
525 * - encoding: unused\
526 * - decoding: MUST be set by get_buffer()\
531 * is this picture used as reference\
532 * - encoding: unused\
533 * - decoding: set by lavc (before get_buffer() call))\
539 * - encoding: unused\
540 * - decoding: set by lavc\
542 int8_t *qscale_table;\
545 * - encoding: unused\
546 * - decoding: set by lavc\
551 * mbskip_table[mb]>=1 if MB didnt change\
552 * stride= mb_width = (width+15)>>4\
553 * - encoding: unused\
554 * - decoding: set by lavc\
556 uint8_t *mbskip_table;\
559 * Motion vector table.\
562 * int mv_sample_log2= 4 - motion_subsample_log2;\
563 * int mb_width= (width+15)>>4;\
564 * int mv_stride= (mb_width << mv_sample_log2) + 1;\
565 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];\
567 * - encoding: set by user\
568 * - decoding: set by lavc\
570 int16_t (*motion_val[2])[2];\
573 * Macroblock type table\
574 * mb_type_base + mb_width + 2\
575 * - encoding: set by user\
576 * - decoding: set by lavc\
581 * log2 of the size of the block which a single vector in motion_val represents: \
582 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)\
583 * - encoding: unused\
584 * - decoding: set by lavc\
586 uint8_t motion_subsample_log2;\
589 * for some private data of the user\
590 * - encoding: unused\
591 * - decoding: set by user\
597 * - encoding: set by lavc if flags&CODEC_FLAG_PSNR\
598 * - decoding: unused\
603 * type of the buffer (to keep track of who has to dealloc data[*])\
604 * - encoding: set by the one who allocs it\
605 * - decoding: set by the one who allocs it\
606 * Note: user allocated (direct rendering) & internal buffers can not coexist currently\
611 * when decoding, this signal how much the picture must be delayed.\
612 * extra_delay = repeat_pict / (2*fps)\
613 * - encoding: unused\
614 * - decoding: set by lavc\
624 * The content of the picture is interlaced.\
625 * - encoding: set by user\
626 * - decoding: set by lavc (default 0)\
628 int interlaced_frame;\
631 * if the content is interlaced, is top field displayed first.\
632 * - encoding: set by user\
633 * - decoding: set by lavc\
635 int top_field_first;\
639 * - encoding: set by user\
640 * - decoding: set by lavc\
642 AVPanScan *pan_scan;\
645 * tell user application that palette has changed from previous frame.\
646 * - encoding: ??? (no palette-enabled encoder yet)\
647 * - decoding: set by lavc (default 0)\
649 int palette_has_changed;\
652 * Codec suggestion on buffer type if != 0\
653 * - encoding: unused\
654 * - decoding: set by lavc (before get_buffer() call))\
660 * - encoding: unused\
661 * - decoding: set by lavc\
666 * Motion referece frame index\
667 * - encoding: set by user\
668 * - decoding: set by lavc\
670 int8_t *ref_index[2];
672 #define FF_QSCALE_TYPE_MPEG1 0
673 #define FF_QSCALE_TYPE_MPEG2 1
674 #define FF_QSCALE_TYPE_H264 2
676 #define FF_BUFFER_TYPE_INTERNAL 1
677 #define FF_BUFFER_TYPE_USER 2 ///< Direct rendering buffers (image is (de)allocated by user)
678 #define FF_BUFFER_TYPE_SHARED 4 ///< buffer from somewhere else, don't dealloc image (data/base), all other tables are not shared
679 #define FF_BUFFER_TYPE_COPY 8 ///< just a (modified) copy of some other buffer, don't dealloc anything
682 #define FF_I_TYPE 1 // Intra
683 #define FF_P_TYPE 2 // Predicted
684 #define FF_B_TYPE 3 // Bi-dir predicted
685 #define FF_S_TYPE 4 // S(GMC)-VOP MPEG4
689 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore)
690 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer
691 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content
692 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update)
697 typedef struct AVFrame {
701 #define DEFAULT_FRAME_RATE_BASE 1001000
704 * main external api structure.
706 typedef struct AVCodecContext {
708 * Info on struct for av_log
709 * - set by avcodec_alloc_context
713 * the average bitrate.
714 * - encoding: set by user. unused for constant quantizer encoding
715 * - decoding: set by lavc. 0 or some bitrate if this info is available in the stream
720 * number of bits the bitstream is allowed to diverge from the reference.
721 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
722 * - encoding: set by user. unused for constant quantizer encoding
725 int bit_rate_tolerance;
729 * - encoding: set by user.
730 * - decoding: set by user.
735 * some codecs needs additionnal format info. It is stored here
736 * - encoding: set by user.
737 * - decoding: set by lavc. (FIXME is this ok?)
742 * motion estimation algorithm used for video coding.
743 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
744 * 8 (umh), 9 (iter) [7, 8 are x264 specific, 9 is snow specific]
745 * - encoding: MUST be set by user.
751 * some codecs need / can use extra-data like huffman tables.
752 * mjpeg: huffman tables
753 * rv10: additional flags
754 * mpeg4: global headers (they can be in the bitstream or here)
755 * the allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
756 * then extradata_size to avoid prolems if its read with the bitstream reader
757 * the bytewise contents of extradata must not depend on the architecture or cpu endianness
758 * - encoding: set/allocated/freed by lavc.
759 * - decoding: set/allocated/freed by user.
765 * this is the fundamental unit of time (in seconds) in terms
766 * of which frame timestamps are represented. for fixed-fps content,
767 * timebase should be 1/framerate and timestamp increments should be
769 * - encoding: MUST be set by user
770 * - decoding: set by lavc.
772 AVRational time_base;
776 * picture width / height.
777 * - encoding: MUST be set by user.
778 * - decoding: set by lavc.
779 * Note, for compatibility its possible to set this instead of
780 * coded_width/height before decoding
784 #define FF_ASPECT_EXTENDED 15
787 * the number of pictures in a group of pitures, or 0 for intra_only.
788 * - encoding: set by user.
794 * pixel format, see PIX_FMT_xxx.
795 * - encoding: set by user.
796 * - decoding: set by lavc.
798 enum PixelFormat pix_fmt;
801 * Frame rate emulation. If not zero lower layer (i.e. format handler)
802 * has to read frames at native frame rate.
803 * - encoding: set by user.
804 * - decoding: unused.
809 * if non NULL, 'draw_horiz_band' is called by the libavcodec
810 * decoder to draw an horizontal band. It improve cache usage. Not
811 * all codecs can do that. You must check the codec capabilities
814 * - decoding: set by user.
815 * @param height the height of the slice
816 * @param y the y position of the slice
817 * @param type 1->top field, 2->bottom field, 3->frame
818 * @param offset offset into the AVFrame.data from which the slice should be read
820 void (*draw_horiz_band)(struct AVCodecContext *s,
821 const AVFrame *src, int offset[4],
822 int y, int type, int height);
825 int sample_rate; ///< samples per sec
829 * audio sample format.
830 * - encoding: set by user.
831 * - decoding: set by lavc.
833 enum SampleFormat sample_fmt; ///< sample format, currenly unused
835 /* the following data should not be initialized */
837 * samples per packet. initialized when calling 'init'
840 int frame_number; ///< audio or video frame number
841 int real_pict_num; ///< returns the real picture number of previous encoded frame
844 * number of frames the decoded output will be delayed relative to
846 * - encoding: set by lavc.
851 /* - encoding parameters */
852 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
853 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
857 * - encoding: set by user.
864 * - encoding: set by user.
870 * maximum quantizer difference between frames.
871 * - encoding: set by user.
877 * maximum number of b frames between non b frames.
878 * note: the output will be delayed by max_b_frames+1 relative to the input
879 * - encoding: set by user.
885 * qscale factor between ip and b frames.
886 * - encoding: set by user.
889 float b_quant_factor;
891 /** obsolete FIXME remove */
893 #define FF_RC_STRATEGY_XVID 1
895 int b_frame_strategy;
900 * - decoding: set by user. 1-> skip b frames, 2-> skip idct/dequant too, 5-> skip everything except header
901 * @deprecated Deprecated in favor of skip_idct and skip_frame.
905 struct AVCodec *codec;
909 /* unused, FIXME remove*/
912 int rtp_payload_size; /* The size of the RTP payload: the coder will */
913 /* do it's best to deliver a chunk with size */
914 /* below rtp_payload_size, the chunk will start */
915 /* with a start code on some codecs like H.263 */
916 /* This doesn't take account of any particular */
917 /* headers inside the transmited RTP payload */
920 /* The RTP callback: This function is called */
921 /* every time the encoder has a packet to send */
922 /* Depends on the encoder if the data starts */
923 /* with a Start Code (it should) H.263 does. */
924 /* mb_nb contains the number of macroblocks */
925 /* encoded in the RTP payload */
926 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
928 /* statistics, used for 2-pass encoding */
939 * number of bits used for the previously encoded frame.
940 * - encoding: set by lavc
946 * private data of the user, can be used to carry app specific stuff.
947 * - encoding: set by user
948 * - decoding: set by user
953 enum CodecType codec_type; /* see CODEC_TYPE_xxx */
954 enum CodecID codec_id; /* see CODEC_ID_xxx */
957 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
958 * this is used to workaround some encoder bugs
959 * - encoding: set by user, if not then the default based on codec_id will be used
960 * - decoding: set by user, will be converted to upper case by lavc during init
962 unsigned int codec_tag;
965 * workaround bugs in encoders which sometimes cannot be detected automatically.
966 * - encoding: set by user
967 * - decoding: set by user
970 #define FF_BUG_AUTODETECT 1 ///< autodetection
971 #define FF_BUG_OLD_MSMPEG4 2
972 #define FF_BUG_XVID_ILACE 4
973 #define FF_BUG_UMP4 8
974 #define FF_BUG_NO_PADDING 16
975 #define FF_BUG_AMV 32
976 #define FF_BUG_AC_VLC 0 ///< will be removed, libavcodec can now handle these non compliant files by default
977 #define FF_BUG_QPEL_CHROMA 64
978 #define FF_BUG_STD_QPEL 128
979 #define FF_BUG_QPEL_CHROMA2 256
980 #define FF_BUG_DIRECT_BLOCKSIZE 512
981 #define FF_BUG_EDGE 1024
982 #define FF_BUG_HPEL_CHROMA 2048
983 #define FF_BUG_DC_CLIP 4096
984 #define FF_BUG_MS 8192 ///< workaround various bugs in microsofts broken decoders
985 //#define FF_BUG_FAKE_SCALABILITY 16 //autodetection should work 100%
988 * luma single coeff elimination threshold.
989 * - encoding: set by user
992 int luma_elim_threshold;
995 * chroma single coeff elimination threshold.
996 * - encoding: set by user
999 int chroma_elim_threshold;
1002 * strictly follow the std (MPEG4, ...).
1003 * - encoding: set by user
1004 * - decoding: unused
1006 int strict_std_compliance;
1007 #define FF_COMPLIANCE_VERY_STRICT 2 ///< strictly conform to a older more strict version of the spec or reference software
1008 #define FF_COMPLIANCE_STRICT 1 ///< strictly conform to all the things in the spec no matter what consequences
1009 #define FF_COMPLIANCE_NORMAL 0
1010 #define FF_COMPLIANCE_INOFFICIAL -1 ///< allow inofficial extensions
1011 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< allow non standarized experimental things
1014 * qscale offset between ip and b frames.
1015 * if > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset)
1016 * if < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset)
1017 * - encoding: set by user.
1018 * - decoding: unused
1020 float b_quant_offset;
1023 * error resilience higher values will detect more errors but may missdetect
1024 * some more or less valid parts as errors.
1025 * - encoding: unused
1026 * - decoding: set by user
1028 int error_resilience;
1029 #define FF_ER_CAREFUL 1
1030 #define FF_ER_COMPLIANT 2
1031 #define FF_ER_AGGRESSIVE 3
1032 #define FF_ER_VERY_AGGRESSIVE 4
1035 * called at the beginning of each frame to get a buffer for it.
1036 * if pic.reference is set then the frame will be read later by lavc
1037 * avcodec_align_dimensions() should be used to find the required width and
1038 * height, as they normally need to be rounded up to the next multiple of 16
1039 * - encoding: unused
1040 * - decoding: set by lavc, user can override
1042 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1045 * called to release buffers which where allocated with get_buffer.
1046 * a released buffer can be reused in get_buffer()
1047 * pic.data[*] must be set to NULL
1048 * - encoding: unused
1049 * - decoding: set by lavc, user can override
1051 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1054 * if 1 the stream has a 1 frame delay during decoding.
1055 * - encoding: set by lavc
1056 * - decoding: set by lavc
1061 * number of bytes per packet if constant and known or 0
1062 * used by some WAV based audio codecs
1066 int parse_only; /* - decoding only: if true, only parsing is done
1067 (function avcodec_parse_frame()). The frame
1068 data is returned. Only MPEG codecs support this now. */
1071 * 0-> h263 quant 1-> mpeg quant.
1072 * - encoding: set by user.
1073 * - decoding: unused
1078 * pass1 encoding statistics output buffer.
1079 * - encoding: set by lavc
1080 * - decoding: unused
1085 * pass2 encoding statistics input buffer.
1086 * concatenated stuff from stats_out of pass1 should be placed here
1087 * - encoding: allocated/set/freed by user
1088 * - decoding: unused
1093 * ratecontrol qmin qmax limiting method.
1094 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax
1095 * - encoding: set by user.
1096 * - decoding: unused
1104 * ratecontrol override, see RcOverride.
1105 * - encoding: allocated/set/freed by user.
1106 * - decoding: unused
1108 RcOverride *rc_override;
1109 int rc_override_count;
1112 * rate control equation.
1113 * - encoding: set by user
1114 * - decoding: unused
1120 * - encoding: set by user.
1121 * - decoding: unused
1127 * - encoding: set by user.
1128 * - decoding: unused
1133 * decoder bitstream buffer size.
1134 * - encoding: set by user.
1135 * - decoding: unused
1138 float rc_buffer_aggressivity;
1141 * qscale factor between p and i frames.
1142 * if > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset)
1143 * if < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset)
1144 * - encoding: set by user.
1145 * - decoding: unused
1147 float i_quant_factor;
1150 * qscale offset between p and i frames.
1151 * - encoding: set by user.
1152 * - decoding: unused
1154 float i_quant_offset;
1157 * initial complexity for pass1 ratecontrol.
1158 * - encoding: set by user.
1159 * - decoding: unused
1161 float rc_initial_cplx;
1164 * dct algorithm, see FF_DCT_* below.
1165 * - encoding: set by user
1166 * - decoding: unused
1169 #define FF_DCT_AUTO 0
1170 #define FF_DCT_FASTINT 1
1171 #define FF_DCT_INT 2
1172 #define FF_DCT_MMX 3
1173 #define FF_DCT_MLIB 4
1174 #define FF_DCT_ALTIVEC 5
1175 #define FF_DCT_FAAN 6
1178 * luminance masking (0-> disabled).
1179 * - encoding: set by user
1180 * - decoding: unused
1185 * temporary complexity masking (0-> disabled).
1186 * - encoding: set by user
1187 * - decoding: unused
1189 float temporal_cplx_masking;
1192 * spatial complexity masking (0-> disabled).
1193 * - encoding: set by user
1194 * - decoding: unused
1196 float spatial_cplx_masking;
1199 * p block masking (0-> disabled).
1200 * - encoding: set by user
1201 * - decoding: unused
1206 * darkness masking (0-> disabled).
1207 * - encoding: set by user
1208 * - decoding: unused
1213 /* for binary compatibility */
1217 * idct algorithm, see FF_IDCT_* below.
1218 * - encoding: set by user
1219 * - decoding: set by user
1222 #define FF_IDCT_AUTO 0
1223 #define FF_IDCT_INT 1
1224 #define FF_IDCT_SIMPLE 2
1225 #define FF_IDCT_SIMPLEMMX 3
1226 #define FF_IDCT_LIBMPEG2MMX 4
1227 #define FF_IDCT_PS2 5
1228 #define FF_IDCT_MLIB 6
1229 #define FF_IDCT_ARM 7
1230 #define FF_IDCT_ALTIVEC 8
1231 #define FF_IDCT_SH4 9
1232 #define FF_IDCT_SIMPLEARM 10
1233 #define FF_IDCT_H264 11
1234 #define FF_IDCT_VP3 12
1235 #define FF_IDCT_IPP 13
1236 #define FF_IDCT_XVIDMMX 14
1237 #define FF_IDCT_CAVS 15
1238 #define FF_IDCT_SIMPLEARMV5TE 16
1239 #define FF_IDCT_SIMPLEARMV6 17
1243 * - encoding: set by lavc
1244 * - decoding: set by user (or 0)
1248 * slice offsets in the frame in bytes.
1249 * - encoding: set/allocated by lavc
1250 * - decoding: set/allocated by user (or NULL)
1255 * error concealment flags.
1256 * - encoding: unused
1257 * - decoding: set by user
1259 int error_concealment;
1260 #define FF_EC_GUESS_MVS 1
1261 #define FF_EC_DEBLOCK 2
1264 * dsp_mask could be add used to disable unwanted CPU features
1265 * CPU features (i.e. MMX, SSE. ...)
1267 * with FORCE flag you may instead enable given CPU features
1268 * (Dangerous: usable in case of misdetection, improper usage however will
1269 * result into program crash)
1272 #define FF_MM_FORCE 0x80000000 /* force usage of selected flags (OR) */
1273 /* lower 16 bits - CPU features */
1275 #define FF_MM_MMX 0x0001 /* standard MMX */
1276 #define FF_MM_3DNOW 0x0004 /* AMD 3DNOW */
1277 #define FF_MM_MMXEXT 0x0002 /* SSE integer functions or AMD MMX ext */
1278 #define FF_MM_SSE 0x0008 /* SSE functions */
1279 #define FF_MM_SSE2 0x0010 /* PIV SSE2 functions */
1280 #define FF_MM_3DNOWEXT 0x0020 /* AMD 3DNowExt */
1281 #endif /* HAVE_MMX */
1283 #define FF_MM_IWMMXT 0x0100 /* XScale IWMMXT */
1284 #endif /* HAVE_IWMMXT */
1287 * bits per sample/pixel from the demuxer (needed for huffyuv).
1288 * - encoding: set by lavc
1289 * - decoding: set by user
1291 int bits_per_sample;
1294 * prediction method (needed for huffyuv).
1295 * - encoding: set by user
1296 * - decoding: unused
1298 int prediction_method;
1299 #define FF_PRED_LEFT 0
1300 #define FF_PRED_PLANE 1
1301 #define FF_PRED_MEDIAN 2
1304 * sample aspect ratio (0 if unknown).
1305 * numerator and denominator must be relative prime and smaller then 256 for some video standards
1306 * - encoding: set by user.
1307 * - decoding: set by lavc.
1309 AVRational sample_aspect_ratio;
1312 * the picture in the bitstream.
1313 * - encoding: set by lavc
1314 * - decoding: set by lavc
1316 AVFrame *coded_frame;
1320 * - encoding: set by user.
1321 * - decoding: set by user.
1324 #define FF_DEBUG_PICT_INFO 1
1325 #define FF_DEBUG_RC 2
1326 #define FF_DEBUG_BITSTREAM 4
1327 #define FF_DEBUG_MB_TYPE 8
1328 #define FF_DEBUG_QP 16
1329 #define FF_DEBUG_MV 32
1330 #define FF_DEBUG_DCT_COEFF 0x00000040
1331 #define FF_DEBUG_SKIP 0x00000080
1332 #define FF_DEBUG_STARTCODE 0x00000100
1333 #define FF_DEBUG_PTS 0x00000200
1334 #define FF_DEBUG_ER 0x00000400
1335 #define FF_DEBUG_MMCO 0x00000800
1336 #define FF_DEBUG_BUGS 0x00001000
1337 #define FF_DEBUG_VIS_QP 0x00002000
1338 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
1342 * - encoding: set by user.
1343 * - decoding: set by user.
1346 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
1347 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
1348 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
1352 * - encoding: set by lavc if flags&CODEC_FLAG_PSNR
1353 * - decoding: unused
1358 * minimum MB quantizer.
1359 * - encoding: unused
1360 * - decoding: unused
1365 * maximum MB quantizer.
1366 * - encoding: unused
1367 * - decoding: unused
1372 * motion estimation compare function.
1373 * - encoding: set by user.
1374 * - decoding: unused
1378 * subpixel motion estimation compare function.
1379 * - encoding: set by user.
1380 * - decoding: unused
1384 * macroblock compare function (not supported yet).
1385 * - encoding: set by user.
1386 * - decoding: unused
1390 * interlaced dct compare function
1391 * - encoding: set by user.
1392 * - decoding: unused
1395 #define FF_CMP_SAD 0
1396 #define FF_CMP_SSE 1
1397 #define FF_CMP_SATD 2
1398 #define FF_CMP_DCT 3
1399 #define FF_CMP_PSNR 4
1400 #define FF_CMP_BIT 5
1402 #define FF_CMP_ZERO 7
1403 #define FF_CMP_VSAD 8
1404 #define FF_CMP_VSSE 9
1405 #define FF_CMP_NSSE 10
1406 #define FF_CMP_W53 11
1407 #define FF_CMP_W97 12
1408 #define FF_CMP_DCTMAX 13
1409 #define FF_CMP_DCT264 14
1410 #define FF_CMP_CHROMA 256
1413 * ME diamond size & shape.
1414 * - encoding: set by user.
1415 * - decoding: unused
1420 * amount of previous MV predictors (2a+1 x 2a+1 square).
1421 * - encoding: set by user.
1422 * - decoding: unused
1424 int last_predictor_count;
1427 * pre pass for motion estimation.
1428 * - encoding: set by user.
1429 * - decoding: unused
1434 * motion estimation pre pass compare function.
1435 * - encoding: set by user.
1436 * - decoding: unused
1441 * ME pre pass diamond size & shape.
1442 * - encoding: set by user.
1443 * - decoding: unused
1448 * subpel ME quality.
1449 * - encoding: set by user.
1450 * - decoding: unused
1452 int me_subpel_quality;
1455 * callback to negotiate the pixelFormat.
1456 * @param fmt is the list of formats which are supported by the codec,
1457 * its terminated by -1 as 0 is a valid format, the formats are ordered by quality
1458 * the first is allways the native one
1459 * @return the choosen format
1460 * - encoding: unused
1461 * - decoding: set by user, if not set then the native format will always be choosen
1463 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1466 * DTG active format information (additionnal aspect ratio
1467 * information only used in DVB MPEG2 transport streams). 0 if
1470 * - encoding: unused.
1471 * - decoding: set by decoder
1473 int dtg_active_format;
1474 #define FF_DTG_AFD_SAME 8
1475 #define FF_DTG_AFD_4_3 9
1476 #define FF_DTG_AFD_16_9 10
1477 #define FF_DTG_AFD_14_9 11
1478 #define FF_DTG_AFD_4_3_SP_14_9 13
1479 #define FF_DTG_AFD_16_9_SP_14_9 14
1480 #define FF_DTG_AFD_SP_4_3 15
1483 * Maximum motion estimation search range in subpel units.
1484 * if 0 then no limit
1486 * - encoding: set by user.
1487 * - decoding: unused.
1492 * intra quantizer bias.
1493 * - encoding: set by user.
1494 * - decoding: unused
1496 int intra_quant_bias;
1497 #define FF_DEFAULT_QUANT_BIAS 999999
1500 * inter quantizer bias.
1501 * - encoding: set by user.
1502 * - decoding: unused
1504 int inter_quant_bias;
1508 * - encoding: unused.
1509 * - decoding: which clrtable should be used for 8bit RGB images
1510 * table have to be stored somewhere FIXME
1515 * internal_buffer count.
1516 * Don't touch, used by lavc default_get_buffer()
1518 int internal_buffer_count;
1522 * Don't touch, used by lavc default_get_buffer()
1524 void *internal_buffer;
1526 #define FF_LAMBDA_SHIFT 7
1527 #define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
1528 #define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
1529 #define FF_LAMBDA_MAX (256*128-1)
1531 #define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
1533 * global quality for codecs which cannot change it per frame.
1534 * this should be proportional to MPEG1/2/4 qscale.
1535 * - encoding: set by user.
1536 * - decoding: unused
1540 #define FF_CODER_TYPE_VLC 0
1541 #define FF_CODER_TYPE_AC 1
1544 * - encoding: set by user.
1545 * - decoding: unused
1551 * - encoding: set by user.
1552 * - decoding: unused
1558 * - encoding: unused
1559 * - decoding: set by user.
1561 uint8_t * (*realloc)(struct AVCodecContext *s, uint8_t *buf, int buf_size);
1566 * - encoding: unused
1567 * - decoding: set by user.
1570 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1571 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1572 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1575 * XVideo Motion Acceleration
1576 * - encoding: forbidden
1577 * - decoding: set by decoder
1579 int xvmc_acceleration;
1582 * macroblock decision mode
1583 * - encoding: set by user.
1584 * - decoding: unused
1587 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1588 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1589 #define FF_MB_DECISION_RD 2 ///< rate distoration
1592 * custom intra quantization matrix
1593 * - encoding: set by user, can be NULL
1594 * - decoding: set by lavc
1596 uint16_t *intra_matrix;
1599 * custom inter quantization matrix
1600 * - encoding: set by user, can be NULL
1601 * - decoding: set by lavc
1603 uint16_t *inter_matrix;
1606 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1607 * this is used to workaround some encoder bugs
1608 * - encoding: unused
1609 * - decoding: set by user, will be converted to upper case by lavc during init
1611 unsigned int stream_codec_tag;
1614 * scene change detection threshold.
1615 * 0 is default, larger means fewer detected scene changes
1616 * - encoding: set by user.
1617 * - decoding: unused
1619 int scenechange_threshold;
1622 * minimum lagrange multipler
1623 * - encoding: set by user.
1624 * - decoding: unused
1629 * maximum lagrange multipler
1630 * - encoding: set by user.
1631 * - decoding: unused
1636 * Palette control structure
1637 * - encoding: ??? (no palette-enabled encoder yet)
1638 * - decoding: set by user.
1640 struct AVPaletteControl *palctrl;
1643 * noise reduction strength
1644 * - encoding: set by user.
1645 * - decoding: unused
1647 int noise_reduction;
1650 * called at the beginning of a frame to get cr buffer for it.
1651 * buffer type (size, hints) must be the same. lavc won't check it.
1652 * lavc will pass previous buffer in pic, function should return
1653 * same buffer or new buffer with old frame "painted" into it.
1654 * if pic.data[0] == NULL must behave like get_buffer().
1655 * - encoding: unused
1656 * - decoding: set by lavc, user can override
1658 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1661 * number of bits which should be loaded into the rc buffer before decoding starts
1662 * - encoding: set by user.
1663 * - decoding: unused
1665 int rc_initial_buffer_occupancy;
1669 * - encoding: set by user.
1670 * - decoding: unused
1672 int inter_threshold;
1676 * - encoding: set by user.
1677 * - decoding: set by user.
1682 * simulates errors in the bitstream to test error concealment.
1683 * - encoding: set by user.
1684 * - decoding: unused.
1689 * MP3 antialias algorithm, see FF_AA_* below.
1690 * - encoding: unused
1691 * - decoding: set by user
1694 #define FF_AA_AUTO 0
1695 #define FF_AA_FASTINT 1 //not implemented yet
1697 #define FF_AA_FLOAT 3
1699 * Quantizer noise shaping.
1700 * - encoding: set by user
1701 * - decoding: unused
1703 int quantizer_noise_shaping;
1707 * is used to decide how many independant tasks should be passed to execute()
1708 * - encoding: set by user
1709 * - decoding: set by user
1714 * the codec may call this to execute several independant things. it will return only after
1715 * finishing all tasks, the user may replace this with some multithreaded implementation, the
1716 * default implementation will execute the parts serially
1717 * @param count the number of things to execute
1718 * - encoding: set by lavc, user can override
1719 * - decoding: set by lavc, user can override
1721 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void **arg2, int *ret, int count);
1725 * can be used by execute() to store some per AVCodecContext stuff.
1726 * - encoding: set by execute()
1727 * - decoding: set by execute()
1729 void *thread_opaque;
1732 * Motion estimation threshold. under which no motion estimation is
1733 * performed, but instead the user specified motion vectors are used
1735 * - encoding: set by user
1736 * - decoding: unused
1741 * Macroblock threshold. under which the user specified macroblock types will be used
1742 * - encoding: set by user
1743 * - decoding: unused
1748 * precision of the intra dc coefficient - 8.
1749 * - encoding: set by user
1750 * - decoding: unused
1752 int intra_dc_precision;
1755 * noise vs. sse weight for the nsse comparsion function.
1756 * - encoding: set by user
1757 * - decoding: unused
1762 * number of macroblock rows at the top which are skipped.
1763 * - encoding: unused
1764 * - decoding: set by user
1769 * number of macroblock rows at the bottom which are skipped.
1770 * - encoding: unused
1771 * - decoding: set by user
1777 * - encoding: set by user
1778 * - decoding: set by lavc
1781 #define FF_PROFILE_UNKNOWN -99
1785 * - encoding: set by user
1786 * - decoding: set by lavc
1789 #define FF_LEVEL_UNKNOWN -99
1792 * low resolution decoding. 1-> 1/2 size, 2->1/4 size
1793 * - encoding: unused
1794 * - decoding: set by user
1799 * bitsream width / height. may be different from width/height if lowres
1800 * or other things are used
1801 * - encoding: unused
1802 * - decoding: set by user before init if known, codec should override / dynamically change if needed
1804 int coded_width, coded_height;
1807 * frame skip threshold
1808 * - encoding: set by user
1809 * - decoding: unused
1811 int frame_skip_threshold;
1815 * - encoding: set by user
1816 * - decoding: unused
1818 int frame_skip_factor;
1821 * frame skip exponent
1822 * - encoding: set by user
1823 * - decoding: unused
1828 * frame skip comparission function
1829 * - encoding: set by user.
1830 * - decoding: unused
1835 * border processing masking. raises the quantizer for mbs on the borders
1837 * - encoding: set by user
1838 * - decoding: unused
1840 float border_masking;
1843 * minimum MB lagrange multipler.
1844 * - encoding: set by user.
1845 * - decoding: unused
1850 * maximum MB lagrange multipler.
1851 * - encoding: set by user.
1852 * - decoding: unused
1858 * - encoding: set by user.
1859 * - decoding: unused
1861 int me_penalty_compensation;
1865 * - encoding: unused
1866 * - decoding: set by user.
1868 enum AVDiscard skip_loop_filter;
1872 * - encoding: unused
1873 * - decoding: set by user.
1875 enum AVDiscard skip_idct;
1879 * - encoding: unused
1880 * - decoding: set by user.
1882 enum AVDiscard skip_frame;
1886 * - encoding: set by user.
1887 * - decoding: unused
1893 * - encoding: set by user.
1894 * - decoding: unused
1899 * constant rate factor - quality-based VBR - values ~correspond to qps
1900 * - encoding: set by user.
1901 * - decoding: unused
1906 * constant quantization parameter rate control method
1907 * - encoding: set by user.
1908 * - decoding: unused
1914 * - encoding: set by user.
1915 * - decoding: unused
1920 * number of reference frames
1921 * - encoding: set by user.
1922 * - decoding: unused
1927 * chroma qp offset from luma
1928 * - encoding: set by user.
1929 * - decoding: unused
1934 * influences how often b-frames are used
1935 * - encoding: set by user.
1936 * - decoding: unused
1941 * trellis RD quantization
1942 * - encoding: set by user.
1943 * - decoding: unused
1948 * reduce fluctuations in qp (before curve compression)
1949 * - encoding: set by user.
1950 * - decoding: unused
1952 float complexityblur;
1955 * in-loop deblocking filter alphac0 parameter
1956 * alpha is in the range -6...6
1957 * - encoding: set by user.
1958 * - decoding: unused
1963 * in-loop deblocking filter beta parameter
1964 * beta is in the range -6...6
1965 * - encoding: set by user.
1966 * - decoding: unused
1971 * macroblock subpartition sizes to consider - p8x8, p4x4, b8x8, i8x8, i4x4
1972 * - encoding: set by user.
1973 * - decoding: unused
1976 #define X264_PART_I4X4 0x001 /* Analyse i4x4 */
1977 #define X264_PART_I8X8 0x002 /* Analyse i8x8 (requires 8x8 transform) */
1978 #define X264_PART_P8X8 0x010 /* Analyse p16x8, p8x16 and p8x8 */
1979 #define X264_PART_P4X4 0x020 /* Analyse p8x4, p4x8, p4x4 */
1980 #define X264_PART_B8X8 0x100 /* Analyse b16x8, b8x16 and b8x8 */
1983 * direct mv prediction mode - 0 (none), 1 (spatial), 2 (temporal)
1984 * - encoding: set by user.
1985 * - decoding: unused
1990 * audio cutoff bandwidth (0 means "automatic") . Currently used only by FAAC
1991 * - encoding: set by user.
1992 * - decoding: unused
1997 * multiplied by qscale for each frame and added to scene_change_score
1998 * - encoding: set by user.
1999 * - decoding: unused
2001 int scenechange_factor;
2005 * note: value depends upon the compare functin used for fullpel ME
2006 * - encoding: set by user.
2007 * - decoding: unused
2012 * adjusts sensitivity of b_frame_strategy 1
2013 * - encoding: set by user.
2014 * - decoding: unused
2019 * - encoding: set by user.
2020 * - decoding: unused
2022 int compression_level;
2023 #define FF_COMPRESSION_DEFAULT -1
2026 * sets whether to use LPC mode - used by FLAC encoder
2027 * - encoding: set by user.
2028 * - decoding: unused.
2033 * LPC coefficient precision - used by FLAC encoder
2034 * - encoding: set by user.
2035 * - decoding: unused.
2037 int lpc_coeff_precision;
2040 * - encoding: set by user.
2041 * - decoding: unused.
2043 int min_prediction_order;
2046 * - encoding: set by user.
2047 * - decoding: unused.
2049 int max_prediction_order;
2052 * search method for selecting prediction order
2053 * - encoding: set by user.
2054 * - decoding: unused.
2056 int prediction_order_method;
2059 * - encoding: set by user.
2060 * - decoding: unused.
2062 int min_partition_order;
2065 * - encoding: set by user.
2066 * - decoding: unused.
2068 int max_partition_order;
2071 * GOP timecode frame start number, in non drop frame format
2072 * - encoding: set by user.
2073 * - decoding: unused.
2075 int64_t timecode_frame_start;
2081 typedef struct AVCodec {
2083 enum CodecType type;
2086 int (*init)(AVCodecContext *);
2087 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2088 int (*close)(AVCodecContext *);
2089 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size,
2090 uint8_t *buf, int buf_size);
2092 struct AVCodec *next;
2093 void (*flush)(AVCodecContext *);
2094 const AVRational *supported_framerates; ///array of supported framerates, or NULL if any, array is terminated by {0,0}
2095 const enum PixelFormat *pix_fmts; ///array of supported pixel formats, or NULL if unknown, array is terminanted by -1
2099 * four components are given, that's all.
2100 * the last component is alpha
2102 typedef struct AVPicture {
2104 int linesize[4]; ///< number of bytes per line
2109 * This structure defines a method for communicating palette changes
2110 * between and demuxer and a decoder.
2111 * this is totally broken, palette changes should be sent as AVPackets
2113 #define AVPALETTE_SIZE 1024
2114 #define AVPALETTE_COUNT 256
2115 typedef struct AVPaletteControl {
2117 /* demuxer sets this to 1 to indicate the palette has changed;
2118 * decoder resets to 0 */
2119 int palette_changed;
2121 /* 4-byte ARGB palette entries, stored in native byte order; note that
2122 * the individual palette components should be on a 8-bit scale; if
2123 * the palette data comes from a IBM VGA native format, the component
2124 * data is probably 6 bits in size and needs to be scaled */
2125 unsigned int palette[AVPALETTE_COUNT];
2127 } AVPaletteControl attribute_deprecated;
2129 typedef struct AVSubtitleRect {
2136 uint32_t *rgba_palette;
2140 typedef struct AVSubtitle {
2141 uint16_t format; /* 0 = graphics */
2142 uint32_t start_display_time; /* relative to packet pts, in ms */
2143 uint32_t end_display_time; /* relative to packet pts, in ms */
2145 AVSubtitleRect *rects;
2148 extern AVCodec ac3_encoder;
2149 extern AVCodec amr_nb_encoder;
2150 extern AVCodec amr_wb_encoder;
2151 extern AVCodec asv1_encoder;
2152 extern AVCodec asv2_encoder;
2153 extern AVCodec bmp_encoder;
2154 extern AVCodec dvvideo_encoder;
2155 extern AVCodec faac_encoder;
2156 extern AVCodec ffv1_encoder;
2157 extern AVCodec ffvhuff_encoder;
2158 extern AVCodec flac_encoder;
2159 extern AVCodec flashsv_encoder;
2160 extern AVCodec flv_encoder;
2161 extern AVCodec gif_encoder;
2162 extern AVCodec h261_encoder;
2163 extern AVCodec h263_encoder;
2164 extern AVCodec h263p_encoder;
2165 extern AVCodec h264_encoder;
2166 extern AVCodec huffyuv_encoder;
2167 extern AVCodec jpegls_encoder;
2168 extern AVCodec libgsm_encoder;
2169 extern AVCodec libgsm_ms_encoder;
2170 extern AVCodec libtheora_encoder;
2171 extern AVCodec ljpeg_encoder;
2172 extern AVCodec mdec_encoder;
2173 extern AVCodec mjpeg_encoder;
2174 extern AVCodec mp2_encoder;
2175 extern AVCodec mp3lame_encoder;
2176 extern AVCodec mpeg1video_encoder;
2177 extern AVCodec mpeg2video_encoder;
2178 extern AVCodec mpeg4_encoder;
2179 extern AVCodec msmpeg4v1_encoder;
2180 extern AVCodec msmpeg4v2_encoder;
2181 extern AVCodec msmpeg4v3_encoder;
2182 extern AVCodec oggvorbis_encoder;
2183 extern AVCodec pam_encoder;
2184 extern AVCodec pbm_encoder;
2185 extern AVCodec pgm_encoder;
2186 extern AVCodec pgmyuv_encoder;
2187 extern AVCodec png_encoder;
2188 extern AVCodec ppm_encoder;
2189 extern AVCodec rv10_encoder;
2190 extern AVCodec rv20_encoder;
2191 extern AVCodec snow_encoder;
2192 extern AVCodec sonic_encoder;
2193 extern AVCodec sonic_ls_encoder;
2194 extern AVCodec svq1_encoder;
2195 extern AVCodec vcr1_encoder;
2196 extern AVCodec vorbis_encoder;
2197 extern AVCodec wmav1_encoder;
2198 extern AVCodec wmav2_encoder;
2199 extern AVCodec wmv1_encoder;
2200 extern AVCodec wmv2_encoder;
2201 extern AVCodec x264_encoder;
2202 extern AVCodec xvid_encoder;
2203 extern AVCodec zlib_encoder;
2204 extern AVCodec zmbv_encoder;
2206 extern AVCodec aac_decoder;
2207 extern AVCodec aasc_decoder;
2208 extern AVCodec alac_decoder;
2209 extern AVCodec amr_nb_decoder;
2210 extern AVCodec amr_wb_decoder;
2211 extern AVCodec asv1_decoder;
2212 extern AVCodec asv2_decoder;
2213 extern AVCodec avs_decoder;
2214 extern AVCodec bmp_decoder;
2215 extern AVCodec cavs_decoder;
2216 extern AVCodec cinepak_decoder;
2217 extern AVCodec cljr_decoder;
2218 extern AVCodec cook_decoder;
2219 extern AVCodec cscd_decoder;
2220 extern AVCodec cyuv_decoder;
2221 extern AVCodec dsicinaudio_decoder;
2222 extern AVCodec dsicinvideo_decoder;
2223 extern AVCodec dvvideo_decoder;
2224 extern AVCodec eightbps_decoder;
2225 extern AVCodec ffv1_decoder;
2226 extern AVCodec ffvhuff_decoder;
2227 extern AVCodec flac_decoder;
2228 extern AVCodec flashsv_decoder;
2229 extern AVCodec flic_decoder;
2230 extern AVCodec flv_decoder;
2231 extern AVCodec fourxm_decoder;
2232 extern AVCodec fraps_decoder;
2233 extern AVCodec gif_decoder;
2234 extern AVCodec h261_decoder;
2235 extern AVCodec h263_decoder;
2236 extern AVCodec h263i_decoder;
2237 extern AVCodec h264_decoder;
2238 extern AVCodec huffyuv_decoder;
2239 extern AVCodec idcin_decoder;
2240 extern AVCodec imc_decoder;
2241 extern AVCodec indeo2_decoder;
2242 extern AVCodec indeo3_decoder;
2243 extern AVCodec interplay_dpcm_decoder;
2244 extern AVCodec interplay_video_decoder;
2245 extern AVCodec kmvc_decoder;
2246 extern AVCodec libgsm_decoder;
2247 extern AVCodec libgsm_ms_decoder;
2248 extern AVCodec loco_decoder;
2249 extern AVCodec mace3_decoder;
2250 extern AVCodec mace6_decoder;
2251 extern AVCodec mdec_decoder;
2252 extern AVCodec mjpeg_decoder;
2253 extern AVCodec mjpegb_decoder;
2254 extern AVCodec mmvideo_decoder;
2255 extern AVCodec mp2_decoder;
2256 extern AVCodec mp3_decoder;
2257 extern AVCodec mp3adu_decoder;
2258 extern AVCodec mp3on4_decoder;
2259 extern AVCodec mpc7_decoder;
2260 extern AVCodec mpeg1video_decoder;
2261 extern AVCodec mpeg2video_decoder;
2262 extern AVCodec mpeg4_decoder;
2263 extern AVCodec mpeg4aac_decoder;
2264 extern AVCodec mpeg_xvmc_decoder;
2265 extern AVCodec mpegvideo_decoder;
2266 extern AVCodec msmpeg4v1_decoder;
2267 extern AVCodec msmpeg4v2_decoder;
2268 extern AVCodec msmpeg4v3_decoder;
2269 extern AVCodec msrle_decoder;
2270 extern AVCodec msvideo1_decoder;
2271 extern AVCodec mszh_decoder;
2272 extern AVCodec nuv_decoder;
2273 extern AVCodec oggvorbis_decoder;
2274 extern AVCodec png_decoder;
2275 extern AVCodec qdm2_decoder;
2276 extern AVCodec qdraw_decoder;
2277 extern AVCodec qpeg_decoder;
2278 extern AVCodec qtrle_decoder;
2279 extern AVCodec ra_144_decoder;
2280 extern AVCodec ra_288_decoder;
2281 extern AVCodec roq_decoder;
2282 extern AVCodec roq_dpcm_decoder;
2283 extern AVCodec rpza_decoder;
2284 extern AVCodec rv10_decoder;
2285 extern AVCodec rv20_decoder;
2286 extern AVCodec rv30_decoder;
2287 extern AVCodec rv40_decoder;
2288 extern AVCodec shorten_decoder;
2289 extern AVCodec smackaud_decoder;
2290 extern AVCodec smacker_decoder;
2291 extern AVCodec smc_decoder;
2292 extern AVCodec snow_decoder;
2293 extern AVCodec sol_dpcm_decoder;
2294 extern AVCodec sonic_decoder;
2295 extern AVCodec sp5x_decoder;
2296 extern AVCodec svq1_decoder;
2297 extern AVCodec svq3_decoder;
2298 extern AVCodec targa_decoder;
2299 extern AVCodec theora_decoder;
2300 extern AVCodec tiertexseqvideo_decoder;
2301 extern AVCodec tiff_decoder;
2302 extern AVCodec truemotion1_decoder;
2303 extern AVCodec truemotion2_decoder;
2304 extern AVCodec truespeech_decoder;
2305 extern AVCodec tscc_decoder;
2306 extern AVCodec tta_decoder;
2307 extern AVCodec ulti_decoder;
2308 extern AVCodec vc1_decoder;
2309 extern AVCodec vcr1_decoder;
2310 extern AVCodec vmdaudio_decoder;
2311 extern AVCodec vmdvideo_decoder;
2312 extern AVCodec vmnc_decoder;
2313 extern AVCodec vorbis_decoder;
2314 extern AVCodec vp3_decoder;
2315 extern AVCodec vp5_decoder;
2316 extern AVCodec vp6_decoder;
2317 extern AVCodec vp6f_decoder;
2318 extern AVCodec vqa_decoder;
2319 extern AVCodec wavpack_decoder;
2320 extern AVCodec wmav1_decoder;
2321 extern AVCodec wmav2_decoder;
2322 extern AVCodec wmv1_decoder;
2323 extern AVCodec wmv2_decoder;
2324 extern AVCodec wmv3_decoder;
2325 extern AVCodec wnv1_decoder;
2326 extern AVCodec ws_snd1_decoder;
2327 extern AVCodec xan_dpcm_decoder;
2328 extern AVCodec xan_wc3_decoder;
2329 extern AVCodec xl_decoder;
2330 extern AVCodec zlib_decoder;
2331 extern AVCodec zmbv_decoder;
2334 #define PCM_CODEC(id, name) \
2335 extern AVCodec name ## _decoder; \
2336 extern AVCodec name ## _encoder
2338 PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
2339 PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
2340 PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
2341 PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
2342 PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
2343 PCM_CODEC(CODEC_ID_PCM_S24BE, pcm_s24be);
2344 PCM_CODEC(CODEC_ID_PCM_S24DAUD, pcm_s24daud);
2345 PCM_CODEC(CODEC_ID_PCM_S24LE, pcm_s24le);
2346 PCM_CODEC(CODEC_ID_PCM_S32BE, pcm_s32be);
2347 PCM_CODEC(CODEC_ID_PCM_S32LE, pcm_s32le);
2348 PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
2349 PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
2350 PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
2351 PCM_CODEC(CODEC_ID_PCM_U24BE, pcm_u24be);
2352 PCM_CODEC(CODEC_ID_PCM_U24LE, pcm_u24le);
2353 PCM_CODEC(CODEC_ID_PCM_U32BE, pcm_u32be);
2354 PCM_CODEC(CODEC_ID_PCM_U32LE, pcm_u32le);
2358 PCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm);
2359 PCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx);
2360 PCM_CODEC(CODEC_ID_ADPCM_CT, adpcm_ct);
2361 PCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);
2362 PCM_CODEC(CODEC_ID_ADPCM_G726, adpcm_g726);
2363 PCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
2364 PCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
2365 PCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
2366 PCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
2367 PCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws);
2368 PCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
2369 PCM_CODEC(CODEC_ID_ADPCM_SBPRO_2, adpcm_sbpro_2);
2370 PCM_CODEC(CODEC_ID_ADPCM_SBPRO_3, adpcm_sbpro_3);
2371 PCM_CODEC(CODEC_ID_ADPCM_SBPRO_4, adpcm_sbpro_4);
2372 PCM_CODEC(CODEC_ID_ADPCM_SMJPEG, adpcm_ima_smjpeg);
2373 PCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
2374 PCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa);
2375 PCM_CODEC(CODEC_ID_ADPCM_YAMAHA, adpcm_yamaha);
2379 /* dummy raw video codec */
2380 extern AVCodec rawvideo_decoder;
2381 extern AVCodec rawvideo_encoder;
2383 /* the following codecs use external GPL libs */
2384 extern AVCodec dts_decoder;
2385 extern AVCodec liba52_decoder;
2388 extern AVCodec dvbsub_decoder;
2389 extern AVCodec dvbsub_encoder;
2390 extern AVCodec dvdsub_decoder;
2391 extern AVCodec dvdsub_encoder;
2395 struct ReSampleContext;
2396 struct AVResampleContext;
2398 typedef struct ReSampleContext ReSampleContext;
2400 ReSampleContext *audio_resample_init(int output_channels, int input_channels,
2401 int output_rate, int input_rate);
2402 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
2403 void audio_resample_close(ReSampleContext *s);
2405 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
2406 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
2407 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
2408 void av_resample_close(struct AVResampleContext *c);
2410 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2411 /* YUV420 format is assumed ! */
2413 struct ImgReSampleContext attribute_deprecated;
2415 typedef struct ImgReSampleContext ImgReSampleContext attribute_deprecated;
2417 attribute_deprecated ImgReSampleContext *img_resample_init(int output_width, int output_height,
2418 int input_width, int input_height);
2420 attribute_deprecated ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
2421 int iwidth, int iheight,
2422 int topBand, int bottomBand,
2423 int leftBand, int rightBand,
2424 int padtop, int padbottom,
2425 int padleft, int padright);
2428 attribute_deprecated void img_resample(ImgReSampleContext *s,
2429 AVPicture *output, const AVPicture *input);
2431 attribute_deprecated void img_resample_close(ImgReSampleContext *s);
2436 * Allocate memory for a picture. Call avpicture_free to free it.
2438 * @param picture the picture to be filled in.
2439 * @param pix_fmt the format of the picture.
2440 * @param width the width of the picture.
2441 * @param height the height of the picture.
2442 * @return Zero if successful, a negative value if not.
2444 int avpicture_alloc(AVPicture *picture, int pix_fmt, int width, int height);
2447 * Free a picture previously allocated by avpicture_alloc().
2449 * @param picture The AVPicture to be freed.
2451 void avpicture_free(AVPicture *picture);
2453 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
2454 int pix_fmt, int width, int height);
2455 int avpicture_layout(const AVPicture* src, int pix_fmt, int width, int height,
2456 unsigned char *dest, int dest_size);
2457 int avpicture_get_size(int pix_fmt, int width, int height);
2458 void avcodec_get_chroma_sub_sample(int pix_fmt, int *h_shift, int *v_shift);
2459 const char *avcodec_get_pix_fmt_name(int pix_fmt);
2460 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
2461 enum PixelFormat avcodec_get_pix_fmt(const char* name);
2462 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat p);
2464 #define FF_LOSS_RESOLUTION 0x0001 /* loss due to resolution change */
2465 #define FF_LOSS_DEPTH 0x0002 /* loss due to color depth change */
2466 #define FF_LOSS_COLORSPACE 0x0004 /* loss due to color space conversion */
2467 #define FF_LOSS_ALPHA 0x0008 /* loss of alpha bits */
2468 #define FF_LOSS_COLORQUANT 0x0010 /* loss due to color quantization */
2469 #define FF_LOSS_CHROMA 0x0020 /* loss of chroma (e.g. rgb to gray conversion) */
2471 int avcodec_get_pix_fmt_loss(int dst_pix_fmt, int src_pix_fmt,
2473 int avcodec_find_best_pix_fmt(int pix_fmt_mask, int src_pix_fmt,
2474 int has_alpha, int *loss_ptr);
2476 #define FF_ALPHA_TRANSP 0x0001 /* image has some totally transparent pixels */
2477 #define FF_ALPHA_SEMI_TRANSP 0x0002 /* image has some transparent pixels */
2478 int img_get_alpha_info(const AVPicture *src,
2479 int pix_fmt, int width, int height);
2481 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
2482 /* convert among pixel formats */
2483 attribute_deprecated int img_convert(AVPicture *dst, int dst_pix_fmt,
2484 const AVPicture *src, int pix_fmt,
2485 int width, int height);
2488 /* deinterlace a picture */
2489 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
2490 int pix_fmt, int width, int height);
2492 /* external high level API */
2494 extern AVCodec *first_avcodec;
2496 /* returns LIBAVCODEC_VERSION_INT constant */
2497 unsigned avcodec_version(void);
2498 /* returns LIBAVCODEC_BUILD constant */
2499 unsigned avcodec_build(void);
2502 * Initializes libavcodec.
2504 * @warning This function \e must be called before any other libavcodec
2507 void avcodec_init(void);
2509 void register_avcodec(AVCodec *format);
2512 * Finds an encoder with a matching codec ID.
2514 * @param id CodecID of the requested encoder.
2515 * @return An encoder if one was found, NULL otherwise.
2517 AVCodec *avcodec_find_encoder(enum CodecID id);
2520 * Finds an encoder with the specified name.
2522 * @param name Name of the requested encoder.
2523 * @return An encoder if one was found, NULL otherwise.
2525 AVCodec *avcodec_find_encoder_by_name(const char *name);
2528 * Finds a decoder with a matching codec ID.
2530 * @param id CodecID of the requested decoder.
2531 * @return A decoder if one was found, NULL otherwise.
2533 AVCodec *avcodec_find_decoder(enum CodecID id);
2536 * Finds an decoder with the specified name.
2538 * @param name Name of the requested decoder.
2539 * @return A decoder if one was found, NULL otherwise.
2541 AVCodec *avcodec_find_decoder_by_name(const char *name);
2542 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
2545 * Sets the fields of the given AVCodecContext to default values.
2547 * @param s The AVCodecContext of which the fields should be set to default values.
2549 void avcodec_get_context_defaults(AVCodecContext *s);
2552 * Allocates an AVCodecContext and sets its fields to default values. The
2553 * resulting struct can be deallocated by simply calling av_free().
2555 * @return An AVCodecContext filled with default values or NULL on failure.
2556 * @see avcodec_get_context_defaults
2558 AVCodecContext *avcodec_alloc_context(void);
2561 * Sets the fields of the given AVFrame to default values.
2563 * @param pic The AVFrame of which the fields should be set to default values.
2565 void avcodec_get_frame_defaults(AVFrame *pic);
2568 * Allocates an AVFrame and sets its fields to default values. The resulting
2569 * struct can be deallocated by simply calling av_free().
2571 * @return An AVFrame filled with default values or NULL on failure.
2572 * @see avcodec_get_frame_defaults
2574 AVFrame *avcodec_alloc_frame(void);
2576 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
2577 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
2578 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
2579 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
2582 * Checks if the given dimension of a picture is valid, meaning that all
2583 * bytes of the picture can be addressed with a signed int.
2585 * @param[in] w Width of the picture.
2586 * @param[in] h Height of the picture.
2587 * @return Zero if valid, a negative value if invalid.
2589 int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h);
2590 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
2592 int avcodec_thread_init(AVCodecContext *s, int thread_count);
2593 void avcodec_thread_free(AVCodecContext *s);
2594 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2595 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void **arg, int *ret, int count);
2596 //FIXME func typedef
2599 * Initializes the AVCodecContext to use the given AVCodec. Prior to using this
2600 * function the context has to be allocated.
2602 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
2603 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
2604 * retrieving a codec.
2606 * @warning This function is not thread save!
2609 * codec = avcodec_find_decoder(CODEC_ID_H264);
2613 * context = avcodec_alloc_context();
2615 * if (avcodec_open(context, codec) < 0)
2619 * @param avctx The context which will be setup to use the given codec.
2620 * @param codec The codec to use within the context.
2621 * @return Zero on success, a negative value on error.
2622 * @see avcodec_alloc_context, avcodec_find_decoder, avcodec_find_encoder
2624 int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
2627 * @deprecated Use avcodec_decode_audio2() instead.
2629 attribute_deprecated int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
2630 int *frame_size_ptr,
2631 uint8_t *buf, int buf_size);
2634 * Decodes an audio frame from \p buf into \p samples.
2635 * The avcodec_decode_audio2() function decodes a frame of audio from the input
2636 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2637 * audiocodec which was coupled with \p avctx using avcodec_open(). The
2638 * resulting decoded frame is stored in output buffer \p samples. If no frame
2639 * could be decompressed, \p frame_size_ptr is zero. Otherwise, it is the
2640 * decompressed frame size in \e bytes.
2642 * @warning You \e must set \p frame_size_ptr to the allocated size of the
2643 * output buffer before calling avcodec_decode_audio2().
2645 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2646 * the actual read bytes because some optimized bitstream readers read 32 or 64
2647 * bits at once and could read over the end.
2649 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2650 * no overreading happens for damaged MPEG streams.
2652 * @note You might have to align the input buffer \p buf and output buffer \p
2653 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
2654 * necessary at all, on others it won't work at all if not aligned and on others
2655 * it will work but it will have an impact on performance. In practice, the
2656 * bitstream should have 4 byte alignment at minimum and all sample data should
2657 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2658 * the linesize is not a multiple of 16 then there's no sense in aligning the
2659 * start of the buffer to 16.
2661 * @param avctx The codec context.
2662 * @param[out] samples The output buffer.
2663 * @param[in,out] frame_size_ptr The output buffer size in bytes.
2664 * @param[in] buf The input buffer.
2665 * @param[in] buf_size The input buffer size in bytes.
2666 * @return On error a negative value is returned, otherwise the number of bytes
2667 * used or zero if no frame could be decompressed.
2669 int avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,
2670 int *frame_size_ptr,
2671 uint8_t *buf, int buf_size);
2674 * Decodes a video frame from \p buf into \p picture.
2675 * The avcodec_decode_video() function decodes a frame of video from the input
2676 * buffer \p buf of size \p buf_size. To decode it, it makes use of the
2677 * videocodec which was coupled with \p avctx using avcodec_open(). The
2678 * resulting decoded frame is stored in \p picture.
2680 * @warning The input buffer must be \c FF_INPUT_BUFFER_PADDING_SIZE larger than
2681 * the actual read bytes because some optimized bitstream readers read 32 or 64
2682 * bits at once and could read over the end.
2684 * @warning The end of the input buffer \p buf should be set to 0 to ensure that
2685 * no overreading happens for damaged MPEG streams.
2687 * @note You might have to align the input buffer \p buf and output buffer \p
2688 * samples. The alignment requirements depend on the CPU: on some CPUs it isn't
2689 * necessary at all, on others it won't work at all if not aligned and on others
2690 * it will work but it will have an impact on performance. In practice, the
2691 * bitstream should have 4 byte alignment at minimum and all sample data should
2692 * be 16 byte aligned unless the CPU doesn't need it (AltiVec and SSE do). If
2693 * the linesize is not a multiple of 16 then there's no sense in aligning the
2694 * start of the buffer to 16.
2696 * @param avctx The codec context.
2697 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
2698 * @param[in] buf The input buffer.
2699 * @param[in] buf_size The size of the input buffer in bytes.
2700 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is non zero.
2701 * @return On error a negative value is returned, otherwise the number of bytes
2702 * used or zero if no frame could be decompressed.
2704 int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
2705 int *got_picture_ptr,
2706 uint8_t *buf, int buf_size);
2708 /* decode a subtitle message. return -1 if error, otherwise return the
2709 *number of bytes used. If no subtitle could be decompressed,
2710 *got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
2711 int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
2713 const uint8_t *buf, int buf_size);
2714 int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
2716 uint8_t *buf, int buf_size);
2719 * Encodes an audio frame from \p samples into \p buf.
2720 * The avcodec_encode_audio() function encodes a frame of audio from the input
2721 * buffer \p samples. To encode it, it makes use of the audiocodec which was
2722 * coupled with \p avctx using avcodec_open(). The resulting encoded frame is
2723 * stored in output buffer \p buf.
2725 * @note The output buffer should be at least \c FF_MIN_BUFFER_SIZE bytes large.
2727 * @param avctx The codec context.
2728 * @param[out] buf The output buffer.
2729 * @param[in] buf_size The output buffer size.
2730 * @param[in] samples The input buffer containing the samples.
2731 * @return On error a negative value is returned, on succes zero or the number
2732 * of bytes used from the input buffer.
2734 int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2735 const short *samples);
2738 * Encodes a video frame from \p pict into \p buf.
2739 * The avcodec_encode_video() function encodes a frame of video from the input
2740 * \p pict. To encode it, it makes use of the videocodec which was coupled with
2741 * \p avctx using avcodec_open(). The resulting encoded bytes representing the
2742 * frame are stored in the output buffer \p buf. The input picture should be
2743 * stored using a specific format, namely \c avctx.pix_fmt.
2745 * @param avctx The codec context.
2746 * @param[out] buf The output buffer for the bitstream of encoded frame.
2747 * @param[in] buf_size The size of the outputbuffer in bytes.
2748 * @param[in] pict The input picture to encode.
2749 * @return On error a negative value is returned, on success zero or the number
2750 * of bytes used from the input buffer.
2752 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2753 const AVFrame *pict);
2754 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
2755 const AVSubtitle *sub);
2757 int avcodec_close(AVCodecContext *avctx);
2759 void avcodec_register_all(void);
2762 * Flush buffers, should be called when seeking or when switching to a different stream.
2764 void avcodec_flush_buffers(AVCodecContext *avctx);
2766 void avcodec_default_free_buffers(AVCodecContext *s);
2768 /* misc useful functions */
2771 * Returns a single letter to describe the given picture type \p pict_type.
2773 * @param[in] pict_type The picture type.
2774 * @return A single character representing the picture type.
2776 char av_get_pict_type_char(int pict_type);
2779 * returns codec bits per sample
2781 int av_get_bits_per_sample(enum CodecID codec_id);
2784 typedef struct AVCodecParserContext {
2786 struct AVCodecParser *parser;
2787 int64_t frame_offset; /* offset of the current frame */
2788 int64_t cur_offset; /* current offset
2789 (incremented by each av_parser_parse()) */
2790 int64_t last_frame_offset; /* offset of the last frame */
2792 int pict_type; /* XXX: put it back in AVCodecContext */
2793 int repeat_pict; /* XXX: put it back in AVCodecContext */
2794 int64_t pts; /* pts of the current frame */
2795 int64_t dts; /* dts of the current frame */
2800 int fetch_timestamp;
2802 #define AV_PARSER_PTS_NB 4
2803 int cur_frame_start_index;
2804 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
2805 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
2806 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
2809 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
2810 } AVCodecParserContext;
2812 typedef struct AVCodecParser {
2813 int codec_ids[5]; /* several codec IDs are permitted */
2815 int (*parser_init)(AVCodecParserContext *s);
2816 int (*parser_parse)(AVCodecParserContext *s,
2817 AVCodecContext *avctx,
2818 uint8_t **poutbuf, int *poutbuf_size,
2819 const uint8_t *buf, int buf_size);
2820 void (*parser_close)(AVCodecParserContext *s);
2821 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
2822 struct AVCodecParser *next;
2825 extern AVCodecParser *av_first_parser;
2827 void av_register_codec_parser(AVCodecParser *parser);
2828 AVCodecParserContext *av_parser_init(int codec_id);
2829 int av_parser_parse(AVCodecParserContext *s,
2830 AVCodecContext *avctx,
2831 uint8_t **poutbuf, int *poutbuf_size,
2832 const uint8_t *buf, int buf_size,
2833 int64_t pts, int64_t dts);
2834 int av_parser_change(AVCodecParserContext *s,
2835 AVCodecContext *avctx,
2836 uint8_t **poutbuf, int *poutbuf_size,
2837 const uint8_t *buf, int buf_size, int keyframe);
2838 void av_parser_close(AVCodecParserContext *s);
2840 extern AVCodecParser aac_parser;
2841 extern AVCodecParser ac3_parser;
2842 extern AVCodecParser cavsvideo_parser;
2843 extern AVCodecParser dvbsub_parser;
2844 extern AVCodecParser dvdsub_parser;
2845 extern AVCodecParser h261_parser;
2846 extern AVCodecParser h263_parser;
2847 extern AVCodecParser h264_parser;
2848 extern AVCodecParser mjpeg_parser;
2849 extern AVCodecParser mpeg4video_parser;
2850 extern AVCodecParser mpegaudio_parser;
2851 extern AVCodecParser mpegvideo_parser;
2852 extern AVCodecParser pnm_parser;
2853 extern AVCodecParser vc1_parser;
2856 typedef struct AVBitStreamFilterContext {
2858 struct AVBitStreamFilter *filter;
2859 AVCodecParserContext *parser;
2860 struct AVBitStreamFilterContext *next;
2861 } AVBitStreamFilterContext;
2864 typedef struct AVBitStreamFilter {
2867 int (*filter)(AVBitStreamFilterContext *bsfc,
2868 AVCodecContext *avctx, const char *args,
2869 uint8_t **poutbuf, int *poutbuf_size,
2870 const uint8_t *buf, int buf_size, int keyframe);
2871 struct AVBitStreamFilter *next;
2872 } AVBitStreamFilter;
2874 extern AVBitStreamFilter *av_first_bitstream_filter;
2876 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
2877 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
2878 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
2879 AVCodecContext *avctx, const char *args,
2880 uint8_t **poutbuf, int *poutbuf_size,
2881 const uint8_t *buf, int buf_size, int keyframe);
2882 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
2884 extern AVBitStreamFilter dump_extradata_bsf;
2885 extern AVBitStreamFilter remove_extradata_bsf;
2886 extern AVBitStreamFilter noise_bsf;
2887 extern AVBitStreamFilter mp3_header_compress_bsf;
2888 extern AVBitStreamFilter mp3_header_decompress_bsf;
2889 extern AVBitStreamFilter mjpega_dump_header_bsf;
2895 * realloc which does nothing if the block is large enough
2897 void *av_fast_realloc(void *ptr, unsigned int *size, unsigned int min_size);
2899 /* for static data only */
2902 * free all static arrays and reset pointers to 0.
2903 * call av_free_static to release all staticaly allocated tables
2905 void av_free_static(void);
2908 * allocation of static arrays - do not use for normal allocation.
2910 void *av_mallocz_static(unsigned int size);
2913 * same as above, but does realloc
2915 void *av_realloc_static(void *ptr, unsigned int size);
2917 void img_copy(AVPicture *dst, const AVPicture *src,
2918 int pix_fmt, int width, int height);
2920 int img_crop(AVPicture *dst, const AVPicture *src,
2921 int pix_fmt, int top_band, int left_band);
2923 int img_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 extern unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
2928 /* error handling */
2930 #define AVERROR(e) (-(e)) /**< returns a negative error code from a POSIX error code, to return from library functions. */
2931 #define AVUNERROR(e) (-(e)) /**< returns a POSIX error code from a library function error return value. */
2933 /* some platforms have E* and errno already negated. */
2934 #define AVERROR(e) (e)
2935 #define AVUNERROR(e) (e)
2937 #define AVERROR_UNKNOWN AVERROR(EINVAL) /**< unknown error */
2938 #define AVERROR_IO AVERROR(EIO) /**< i/o error */
2939 #define AVERROR_NUMEXPECTED AVERROR(EDOM) /**< number syntax expected in filename */
2940 #define AVERROR_INVALIDDATA AVERROR(EINVAL) /**< invalid data found */
2941 #define AVERROR_NOMEM AVERROR(ENOMEM) /**< not enough memory */
2942 #define AVERROR_NOFMT AVERROR(EILSEQ) /**< unknown format */
2943 #define AVERROR_NOTSUPP AVERROR(ENOSYS) /**< operation not supported */
2949 #endif /* AVCODEC_H */