2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/cpu.h"
33 #include "libavutil/dict.h"
34 #include "libavutil/log.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/rational.h"
38 #include "libavcodec/version.h"
40 * @defgroup libavc Encoding/Decoding Library
43 * @defgroup lavc_decoding Decoding
47 * @defgroup lavc_encoding Encoding
51 * @defgroup lavc_codec Codecs
53 * @defgroup lavc_codec_native Native Codecs
56 * @defgroup lavc_codec_wrappers External library wrappers
59 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
63 * @defgroup lavc_internal Internal
71 * @defgroup lavc_core Core functions/structures.
74 * Basic definitions, functions for querying libavcodec capabilities,
75 * allocating core structures, etc.
81 * Identify the syntax and semantics of the bitstream.
82 * The principle is roughly:
83 * Two decoders with the same ID can decode the same streams.
84 * Two encoders with the same ID can encode compatible streams.
85 * There may be slight deviations from the principle due to implementation
88 * If you add a codec ID to this list, add it so that
89 * 1. no value of a existing codec ID changes (that would break ABI),
90 * 2. it is as close as possible to similar codecs.
96 AV_CODEC_ID_MPEG1VIDEO,
97 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
98 AV_CODEC_ID_MPEG2VIDEO_XVMC,
109 AV_CODEC_ID_RAWVIDEO,
110 AV_CODEC_ID_MSMPEG4V1,
111 AV_CODEC_ID_MSMPEG4V2,
112 AV_CODEC_ID_MSMPEG4V3,
135 AV_CODEC_ID_INTERPLAY_VIDEO,
142 AV_CODEC_ID_MSVIDEO1,
147 AV_CODEC_ID_TRUEMOTION1,
148 AV_CODEC_ID_VMDVIDEO,
174 AV_CODEC_ID_TRUEMOTION2,
180 AV_CODEC_ID_SMACKVIDEO,
185 AV_CODEC_ID_JPEG2000,
191 AV_CODEC_ID_DSICINVIDEO,
192 AV_CODEC_ID_TIERTEXSEQVIDEO,
200 AV_CODEC_ID_BETHSOFTVID,
212 AV_CODEC_ID_ESCAPE124,
216 AV_CODEC_ID_MOTIONPIXELS,
228 AV_CODEC_ID_FLASHSV2,
229 AV_CODEC_ID_CDGRAPHICS,
232 AV_CODEC_ID_BINKVIDEO,
233 AV_CODEC_ID_IFF_ILBM,
234 AV_CODEC_ID_IFF_BYTERUN1,
240 AV_CODEC_ID_A64_MULTI,
241 AV_CODEC_ID_A64_MULTI5,
244 AV_CODEC_ID_LAGARITH,
248 AV_CODEC_ID_WMV3IMAGE,
249 AV_CODEC_ID_VC1IMAGE,
251 AV_CODEC_ID_BMV_VIDEO,
258 AV_CODEC_ID_ZEROCODEC,
265 /* various PCM "codecs" */
266 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
267 AV_CODEC_ID_PCM_S16LE = 0x10000,
268 AV_CODEC_ID_PCM_S16BE,
269 AV_CODEC_ID_PCM_U16LE,
270 AV_CODEC_ID_PCM_U16BE,
273 AV_CODEC_ID_PCM_MULAW,
274 AV_CODEC_ID_PCM_ALAW,
275 AV_CODEC_ID_PCM_S32LE,
276 AV_CODEC_ID_PCM_S32BE,
277 AV_CODEC_ID_PCM_U32LE,
278 AV_CODEC_ID_PCM_U32BE,
279 AV_CODEC_ID_PCM_S24LE,
280 AV_CODEC_ID_PCM_S24BE,
281 AV_CODEC_ID_PCM_U24LE,
282 AV_CODEC_ID_PCM_U24BE,
283 AV_CODEC_ID_PCM_S24DAUD,
284 AV_CODEC_ID_PCM_ZORK,
285 AV_CODEC_ID_PCM_S16LE_PLANAR,
287 AV_CODEC_ID_PCM_F32BE,
288 AV_CODEC_ID_PCM_F32LE,
289 AV_CODEC_ID_PCM_F64BE,
290 AV_CODEC_ID_PCM_F64LE,
291 AV_CODEC_ID_PCM_BLURAY,
294 AV_CODEC_ID_PCM_S8_PLANAR,
296 /* various ADPCM codecs */
297 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
298 AV_CODEC_ID_ADPCM_IMA_WAV,
299 AV_CODEC_ID_ADPCM_IMA_DK3,
300 AV_CODEC_ID_ADPCM_IMA_DK4,
301 AV_CODEC_ID_ADPCM_IMA_WS,
302 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
303 AV_CODEC_ID_ADPCM_MS,
304 AV_CODEC_ID_ADPCM_4XM,
305 AV_CODEC_ID_ADPCM_XA,
306 AV_CODEC_ID_ADPCM_ADX,
307 AV_CODEC_ID_ADPCM_EA,
308 AV_CODEC_ID_ADPCM_G726,
309 AV_CODEC_ID_ADPCM_CT,
310 AV_CODEC_ID_ADPCM_SWF,
311 AV_CODEC_ID_ADPCM_YAMAHA,
312 AV_CODEC_ID_ADPCM_SBPRO_4,
313 AV_CODEC_ID_ADPCM_SBPRO_3,
314 AV_CODEC_ID_ADPCM_SBPRO_2,
315 AV_CODEC_ID_ADPCM_THP,
316 AV_CODEC_ID_ADPCM_IMA_AMV,
317 AV_CODEC_ID_ADPCM_EA_R1,
318 AV_CODEC_ID_ADPCM_EA_R3,
319 AV_CODEC_ID_ADPCM_EA_R2,
320 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
321 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
322 AV_CODEC_ID_ADPCM_EA_XAS,
323 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
324 AV_CODEC_ID_ADPCM_IMA_ISS,
325 AV_CODEC_ID_ADPCM_G722,
326 AV_CODEC_ID_ADPCM_IMA_APC,
329 AV_CODEC_ID_AMR_NB = 0x12000,
332 /* RealAudio codecs*/
333 AV_CODEC_ID_RA_144 = 0x13000,
336 /* various DPCM codecs */
337 AV_CODEC_ID_ROQ_DPCM = 0x14000,
338 AV_CODEC_ID_INTERPLAY_DPCM,
339 AV_CODEC_ID_XAN_DPCM,
340 AV_CODEC_ID_SOL_DPCM,
343 AV_CODEC_ID_MP2 = 0x15000,
344 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
354 AV_CODEC_ID_VMDAUDIO,
360 AV_CODEC_ID_WESTWOOD_SND1,
361 AV_CODEC_ID_GSM, ///< as in Berlin toast format
364 AV_CODEC_ID_TRUESPEECH,
366 AV_CODEC_ID_SMACKAUDIO,
369 AV_CODEC_ID_DSICINAUDIO,
371 AV_CODEC_ID_MUSEPACK7,
373 AV_CODEC_ID_GSM_MS, /* as found in WAV */
377 AV_CODEC_ID_NELLYMOSER,
378 AV_CODEC_ID_MUSEPACK8,
380 AV_CODEC_ID_WMAVOICE,
382 AV_CODEC_ID_WMALOSSLESS,
391 AV_CODEC_ID_BINKAUDIO_RDFT,
392 AV_CODEC_ID_BINKAUDIO_DCT,
393 AV_CODEC_ID_AAC_LATM,
398 AV_CODEC_ID_8SVX_EXP,
399 AV_CODEC_ID_8SVX_FIB,
400 AV_CODEC_ID_BMV_AUDIO,
405 /* subtitle codecs */
406 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
407 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
408 AV_CODEC_ID_DVB_SUBTITLE,
409 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
412 AV_CODEC_ID_MOV_TEXT,
413 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
414 AV_CODEC_ID_DVB_TELETEXT,
417 /* other specific kind of codecs (generally used for attachments) */
418 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
419 AV_CODEC_ID_TTF = 0x18000,
421 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
423 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
424 * stream (only used by libavformat) */
425 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
426 * stream (only used by libavformat) */
427 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
430 #include "old_codec_ids.h"
435 #define CodecID AVCodecID
438 #if FF_API_OLD_DECODE_AUDIO
440 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 192000 // 1 second of 48khz 32bit audio
444 * @ingroup lavc_decoding
445 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
446 * This is mainly needed because some optimized bitstream readers read
447 * 32 or 64 bit at once and could read over the end.<br>
448 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
449 * MPEG bitstreams could cause overread and segfault.
451 #define FF_INPUT_BUFFER_PADDING_SIZE 8
454 * @ingroup lavc_encoding
455 * minimum encoding buffer size
456 * Used to avoid some checks during header writing.
458 #define FF_MIN_BUFFER_SIZE 16384
462 * @ingroup lavc_encoding
463 * motion estimation type.
466 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
470 ME_EPZS, ///< enhanced predictive zonal search
471 ME_X1, ///< reserved for experiments
472 ME_HEX, ///< hexagon based search
473 ME_UMH, ///< uneven multi-hexagon search
474 ME_ITER, ///< iterative search
475 ME_TESA, ///< transformed exhaustive search algorithm
479 * @ingroup lavc_decoding
482 /* We leave some space between them for extensions (drop some
483 * keyframes for intra-only or drop just some bidir frames). */
484 AVDISCARD_NONE =-16, ///< discard nothing
485 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
486 AVDISCARD_NONREF = 8, ///< discard all non reference
487 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
488 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
489 AVDISCARD_ALL = 48, ///< discard all
492 enum AVColorPrimaries{
493 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
494 AVCOL_PRI_UNSPECIFIED = 2,
495 AVCOL_PRI_BT470M = 4,
496 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
497 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
498 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
500 AVCOL_PRI_NB , ///< Not part of ABI
503 enum AVColorTransferCharacteristic{
504 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
505 AVCOL_TRC_UNSPECIFIED = 2,
506 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
507 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
508 AVCOL_TRC_SMPTE240M = 7,
509 AVCOL_TRC_NB , ///< Not part of ABI
514 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
515 AVCOL_SPC_UNSPECIFIED = 2,
517 AVCOL_SPC_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
518 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
519 AVCOL_SPC_SMPTE240M = 7,
520 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
521 AVCOL_SPC_NB , ///< Not part of ABI
525 AVCOL_RANGE_UNSPECIFIED = 0,
526 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
527 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
528 AVCOL_RANGE_NB , ///< Not part of ABI
532 * X X 3 4 X X are luma samples,
533 * 1 2 1-6 are possible chroma positions
534 * X X 5 6 X 0 is undefined/unknown position
536 enum AVChromaLocation{
537 AVCHROMA_LOC_UNSPECIFIED = 0,
538 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
539 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
540 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
541 AVCHROMA_LOC_TOP = 4,
542 AVCHROMA_LOC_BOTTOMLEFT = 5,
543 AVCHROMA_LOC_BOTTOM = 6,
544 AVCHROMA_LOC_NB , ///< Not part of ABI
547 enum AVAudioServiceType {
548 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
549 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
550 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
551 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
552 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
553 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
554 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
555 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
556 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
557 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
561 * @ingroup lavc_encoding
563 typedef struct RcOverride{
566 int qscale; // If this is 0 then quality_factor will be used instead.
567 float quality_factor;
570 #define FF_MAX_B_FRAMES 16
573 These flags can be passed in AVCodecContext.flags before initialization.
574 Note: Not everything is supported yet.
577 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
578 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
579 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
580 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
581 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
583 * The parent program guarantees that the input for B-frames containing
584 * streams is not written to for at least s->max_b_frames+1 frames, if
585 * this is not set the input will be copied.
587 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
588 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
589 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
590 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
591 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
592 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
593 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
594 location instead of only at frame boundaries. */
595 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
596 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
597 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
598 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
599 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
600 /* Fx : Flag for h263+ extra options */
601 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
602 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
603 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
604 #define CODEC_FLAG_CLOSED_GOP 0x80000000
605 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
606 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
607 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
608 #if FF_API_MPV_GLOBAL_OPTS
609 #define CODEC_FLAG_CBP_RD 0x04000000 ///< Use rate distortion optimization for cbp.
610 #define CODEC_FLAG_QP_RD 0x08000000 ///< Use rate distortion optimization for qp selectioon.
611 #define CODEC_FLAG2_STRICT_GOP 0x00000002 ///< Strictly enforce GOP size.
612 #define CODEC_FLAG2_SKIP_RD 0x00004000 ///< RD optimal MB level residual skipping
614 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
616 /* Unsupported options :
617 * Syntax Arithmetic coding (SAC)
618 * Reference Picture Selection
619 * Independent Segment Decoding */
621 /* codec capabilities */
623 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
625 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
626 * If not set, it might not use get_buffer() at all or use operations that
627 * assume the buffer was allocated by avcodec_default_get_buffer.
629 #define CODEC_CAP_DR1 0x0002
630 #define CODEC_CAP_TRUNCATED 0x0008
631 /* Codec can export data for HW decoding (XvMC). */
632 #define CODEC_CAP_HWACCEL 0x0010
634 * Encoder or decoder requires flushing with NULL input at the end in order to
635 * give the complete and correct output.
637 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
638 * with NULL data. The user can still send NULL data to the public encode
639 * or decode function, but libavcodec will not pass it along to the codec
640 * unless this flag is set.
643 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
644 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
648 * The encoder needs to be fed with NULL data at the end of encoding until the
649 * encoder no longer returns data.
651 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
652 * flag also means that the encoder must set the pts and duration for
653 * each output packet. If this flag is not set, the pts and duration will
654 * be determined by libavcodec from the input frame.
656 #define CODEC_CAP_DELAY 0x0020
658 * Codec can be fed a final frame with a smaller size.
659 * This can be used to prevent truncation of the last audio samples.
661 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
663 * Codec can export data for HW decoding (VDPAU).
665 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
667 * Codec can output multiple frames per AVPacket
668 * Normally demuxers return one frame at a time, demuxers which do not do
669 * are connected to a parser to split what they return into proper frames.
670 * This flag is reserved to the very rare category of codecs which have a
671 * bitstream that cannot be split into frames without timeconsuming
672 * operations like full decoding. Demuxers carring such bitstreams thus
673 * may return multiple frames in a packet. This has many disadvantages like
674 * prohibiting stream copy in many cases thus it should only be considered
677 #define CODEC_CAP_SUBFRAMES 0x0100
679 * Codec is experimental and is thus avoided in favor of non experimental
682 #define CODEC_CAP_EXPERIMENTAL 0x0200
684 * Codec should fill in channel configuration and samplerate instead of container
686 #define CODEC_CAP_CHANNEL_CONF 0x0400
688 * Codec is able to deal with negative linesizes
690 #define CODEC_CAP_NEG_LINESIZES 0x0800
692 * Codec supports frame-level multithreading.
694 #define CODEC_CAP_FRAME_THREADS 0x1000
696 * Codec supports slice-based (or partition-based) multithreading.
698 #define CODEC_CAP_SLICE_THREADS 0x2000
700 * Codec supports changed parameters at any point.
702 #define CODEC_CAP_PARAM_CHANGE 0x4000
704 * Codec supports avctx->thread_count == 0 (auto).
706 #define CODEC_CAP_AUTO_THREADS 0x8000
708 * Audio encoder supports receiving a different number of samples in each call.
710 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
712 //The following defines may change, don't expect compatibility if you use them.
713 #define MB_TYPE_INTRA4x4 0x0001
714 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
715 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
716 #define MB_TYPE_16x16 0x0008
717 #define MB_TYPE_16x8 0x0010
718 #define MB_TYPE_8x16 0x0020
719 #define MB_TYPE_8x8 0x0040
720 #define MB_TYPE_INTERLACED 0x0080
721 #define MB_TYPE_DIRECT2 0x0100 //FIXME
722 #define MB_TYPE_ACPRED 0x0200
723 #define MB_TYPE_GMC 0x0400
724 #define MB_TYPE_SKIP 0x0800
725 #define MB_TYPE_P0L0 0x1000
726 #define MB_TYPE_P1L0 0x2000
727 #define MB_TYPE_P0L1 0x4000
728 #define MB_TYPE_P1L1 0x8000
729 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
730 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
731 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
732 #define MB_TYPE_QUANT 0x00010000
733 #define MB_TYPE_CBP 0x00020000
734 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
738 * This specifies the area which should be displayed.
739 * Note there may be multiple such areas for one frame.
741 typedef struct AVPanScan{
744 * - encoding: Set by user.
745 * - decoding: Set by libavcodec.
750 * width and height in 1/16 pel
751 * - encoding: Set by user.
752 * - decoding: Set by libavcodec.
758 * position of the top left corner in 1/16 pel for up to 3 fields/frames
759 * - encoding: Set by user.
760 * - decoding: Set by libavcodec.
762 int16_t position[3][2];
765 #define FF_QSCALE_TYPE_MPEG1 0
766 #define FF_QSCALE_TYPE_MPEG2 1
767 #define FF_QSCALE_TYPE_H264 2
768 #define FF_QSCALE_TYPE_VP56 3
770 #define FF_BUFFER_TYPE_INTERNAL 1
771 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
772 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
773 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
775 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
776 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
777 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
778 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
781 * @defgroup lavc_packet AVPacket
783 * Types and functions for working with AVPacket.
786 enum AVPacketSideDataType {
788 AV_PKT_DATA_NEW_EXTRADATA,
791 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
794 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
795 * s32le channel_count
796 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
797 * u64le channel_layout
798 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
800 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
805 AV_PKT_DATA_PARAM_CHANGE,
808 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
809 * structures with info about macroblocks relevant to splitting the
810 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
811 * That is, it does not necessarily contain info about all macroblocks,
812 * as long as the distance between macroblocks in the info is smaller
813 * than the target payload size.
814 * Each MB info structure is 12 bytes, and is laid out as follows:
816 * u32le bit offset from the start of the packet
817 * u8 current quantizer at the start of the macroblock
819 * u16le macroblock address within the GOB
820 * u8 horizontal MV predictor
821 * u8 vertical MV predictor
822 * u8 horizontal MV predictor for block number 3
823 * u8 vertical MV predictor for block number 3
826 AV_PKT_DATA_H263_MB_INFO,
829 typedef struct AVPacket {
831 * Presentation timestamp in AVStream->time_base units; the time at which
832 * the decompressed packet will be presented to the user.
833 * Can be AV_NOPTS_VALUE if it is not stored in the file.
834 * pts MUST be larger or equal to dts as presentation cannot happen before
835 * decompression, unless one wants to view hex dumps. Some formats misuse
836 * the terms dts and pts/cts to mean something different. Such timestamps
837 * must be converted to true pts/dts before they are stored in AVPacket.
841 * Decompression timestamp in AVStream->time_base units; the time at which
842 * the packet is decompressed.
843 * Can be AV_NOPTS_VALUE if it is not stored in the file.
850 * A combination of AV_PKT_FLAG values
854 * Additional packet data that can be provided by the container.
855 * Packet can contain several types of side information.
860 enum AVPacketSideDataType type;
865 * Duration of this packet in AVStream->time_base units, 0 if unknown.
866 * Equals next_pts - this_pts in presentation order.
869 void (*destruct)(struct AVPacket *);
871 int64_t pos; ///< byte position in stream, -1 if unknown
874 * Time difference in AVStream->time_base units from the pts of this
875 * packet to the point at which the output from the decoder has converged
876 * independent from the availability of previous frames. That is, the
877 * frames are virtually identical no matter if decoding started from
878 * the very first frame or from this keyframe.
879 * Is AV_NOPTS_VALUE if unknown.
880 * This field is not the display duration of the current packet.
881 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
884 * The purpose of this field is to allow seeking in streams that have no
885 * keyframes in the conventional sense. It corresponds to the
886 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
887 * essential for some types of subtitle streams to ensure that all
888 * subtitles are correctly displayed after seeking.
890 int64_t convergence_duration;
892 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
893 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
895 enum AVSideDataParamChangeFlags {
896 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
897 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
898 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
899 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
907 * New fields can be added to the end of AVFRAME with minor version
908 * bumps. Removal, reordering and changes to existing fields require
909 * a major version bump.
910 * sizeof(AVFrame) must not be used outside libav*.
912 typedef struct AVFrame {
913 #define AV_NUM_DATA_POINTERS 8
915 * pointer to the picture/channel planes.
916 * This might be different from the first allocated byte
917 * - encoding: Set by user
918 * - decoding: set by AVCodecContext.get_buffer()
920 uint8_t *data[AV_NUM_DATA_POINTERS];
923 * Size, in bytes, of the data for each picture/channel plane.
925 * For audio, only linesize[0] may be set. For planar audio, each channel
926 * plane must be the same size.
928 * - encoding: Set by user
929 * - decoding: set by AVCodecContext.get_buffer()
931 int linesize[AV_NUM_DATA_POINTERS];
934 * pointers to the data planes/channels.
936 * For video, this should simply point to data[].
938 * For planar audio, each channel has a separate data pointer, and
939 * linesize[0] contains the size of each channel buffer.
940 * For packed audio, there is just one data pointer, and linesize[0]
941 * contains the total size of the buffer for all channels.
943 * Note: Both data and extended_data will always be set by get_buffer(),
944 * but for planar audio with more channels that can fit in data,
945 * extended_data must be used by the decoder in order to access all
949 * decoding: set by AVCodecContext.get_buffer()
951 uint8_t **extended_data;
954 * width and height of the video frame
956 * - decoding: Read by user.
961 * number of audio samples (per channel) described by this frame
962 * - encoding: Set by user
963 * - decoding: Set by libavcodec
968 * format of the frame, -1 if unknown or unset
969 * Values correspond to enum PixelFormat for video frames,
970 * enum AVSampleFormat for audio)
972 * - decoding: Read by user.
977 * 1 -> keyframe, 0-> not
978 * - encoding: Set by libavcodec.
979 * - decoding: Set by libavcodec.
984 * Picture type of the frame, see ?_TYPE below.
985 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
986 * - decoding: Set by libavcodec.
988 enum AVPictureType pict_type;
991 * pointer to the first allocated byte of the picture. Can be used in get_buffer/release_buffer.
992 * This isn't used by libavcodec unless the default get/release_buffer() is used.
996 uint8_t *base[AV_NUM_DATA_POINTERS];
999 * sample aspect ratio for the video frame, 0/1 if unknown/unspecified
1000 * - encoding: unused
1001 * - decoding: Read by user.
1003 AVRational sample_aspect_ratio;
1006 * presentation timestamp in time_base units (time when frame should be shown to user)
1007 * If AV_NOPTS_VALUE then frame_rate = 1/time_base will be assumed.
1008 * - encoding: MUST be set by user.
1009 * - decoding: Set by libavcodec.
1014 * reordered pts from the last AVPacket that has been input into the decoder
1015 * - encoding: unused
1016 * - decoding: Read by user.
1021 * dts from the last AVPacket that has been input into the decoder
1022 * - encoding: unused
1023 * - decoding: Read by user.
1028 * picture number in bitstream order
1029 * - encoding: set by
1030 * - decoding: Set by libavcodec.
1032 int coded_picture_number;
1034 * picture number in display order
1035 * - encoding: set by
1036 * - decoding: Set by libavcodec.
1038 int display_picture_number;
1041 * quality (between 1 (good) and FF_LAMBDA_MAX (bad))
1042 * - encoding: Set by libavcodec. for coded_picture (and set by user for input).
1043 * - decoding: Set by libavcodec.
1048 * is this picture used as reference
1049 * The values for this are the same as the MpegEncContext.picture_structure
1050 * variable, that is 1->top field, 2->bottom field, 3->frame/both fields.
1051 * Set to 4 for delayed, non-reference frames.
1052 * - encoding: unused
1053 * - decoding: Set by libavcodec. (before get_buffer() call)).
1059 * - encoding: unused
1060 * - decoding: Set by libavcodec.
1062 int8_t *qscale_table;
1065 * - encoding: unused
1066 * - decoding: Set by libavcodec.
1076 * mbskip_table[mb]>=1 if MB didn't change
1077 * stride= mb_width = (width+15)>>4
1078 * - encoding: unused
1079 * - decoding: Set by libavcodec.
1081 uint8_t *mbskip_table;
1084 * motion vector table
1087 * int mv_sample_log2= 4 - motion_subsample_log2;
1088 * int mb_width= (width+15)>>4;
1089 * int mv_stride= (mb_width << mv_sample_log2) + 1;
1090 * motion_val[direction][x + y*mv_stride][0->mv_x, 1->mv_y];
1092 * - encoding: Set by user.
1093 * - decoding: Set by libavcodec.
1095 int16_t (*motion_val[2])[2];
1098 * macroblock type table
1099 * mb_type_base + mb_width + 2
1100 * - encoding: Set by user.
1101 * - decoding: Set by libavcodec.
1107 * - encoding: unused
1108 * - decoding: Set by libavcodec.
1113 * motion reference frame index
1114 * the order in which these are stored can depend on the codec.
1115 * - encoding: Set by user.
1116 * - decoding: Set by libavcodec.
1118 int8_t *ref_index[2];
1121 * for some private data of the user
1122 * - encoding: unused
1123 * - decoding: Set by user.
1129 * - encoding: Set by libavcodec. if flags&CODEC_FLAG_PSNR.
1130 * - decoding: unused
1132 uint64_t error[AV_NUM_DATA_POINTERS];
1135 * type of the buffer (to keep track of who has to deallocate data[*])
1136 * - encoding: Set by the one who allocates it.
1137 * - decoding: Set by the one who allocates it.
1138 * Note: User allocated (direct rendering) & internal buffers cannot coexist currently.
1143 * When decoding, this signals how much the picture must be delayed.
1144 * extra_delay = repeat_pict / (2*fps)
1145 * - encoding: unused
1146 * - decoding: Set by libavcodec.
1151 * The content of the picture is interlaced.
1152 * - encoding: Set by user.
1153 * - decoding: Set by libavcodec. (default 0)
1155 int interlaced_frame;
1158 * If the content is interlaced, is top field displayed first.
1159 * - encoding: Set by user.
1160 * - decoding: Set by libavcodec.
1162 int top_field_first;
1165 * Tell user application that palette has changed from previous frame.
1166 * - encoding: ??? (no palette-enabled encoder yet)
1167 * - decoding: Set by libavcodec. (default 0).
1169 int palette_has_changed;
1172 * codec suggestion on buffer type if != 0
1173 * - encoding: unused
1174 * - decoding: Set by libavcodec. (before get_buffer() call)).
1180 * - encoding: Set by user.
1181 * - decoding: Set by libavcodec.
1183 AVPanScan *pan_scan;
1186 * reordered opaque 64bit (generally an integer or a double precision float
1187 * PTS but can be anything).
1188 * The user sets AVCodecContext.reordered_opaque to represent the input at
1190 * the decoder reorders values as needed and sets AVFrame.reordered_opaque
1191 * to exactly one of the values provided by the user through AVCodecContext.reordered_opaque
1192 * @deprecated in favor of pkt_pts
1193 * - encoding: unused
1194 * - decoding: Read by user.
1196 int64_t reordered_opaque;
1199 * hardware accelerator private data (Libav-allocated)
1200 * - encoding: unused
1201 * - decoding: Set by libavcodec
1203 void *hwaccel_picture_private;
1206 * the AVCodecContext which ff_thread_get_buffer() was last called on
1207 * - encoding: Set by libavcodec.
1208 * - decoding: Set by libavcodec.
1210 struct AVCodecContext *owner;
1213 * used by multithreading to store frame-specific info
1214 * - encoding: Set by libavcodec.
1215 * - decoding: Set by libavcodec.
1217 void *thread_opaque;
1220 * log2 of the size of the block which a single vector in motion_val represents:
1221 * (4->16x16, 3->8x8, 2-> 4x4, 1-> 2x2)
1222 * - encoding: unused
1223 * - decoding: Set by libavcodec.
1225 uint8_t motion_subsample_log2;
1228 * Sample rate of the audio data.
1230 * - encoding: unused
1231 * - decoding: set by get_buffer()
1236 * Channel layout of the audio data.
1238 * - encoding: unused
1239 * - decoding: set by get_buffer()
1241 uint64_t channel_layout;
1244 struct AVCodecInternal;
1248 AV_FIELD_PROGRESSIVE,
1249 AV_FIELD_TT, //< Top coded_first, top displayed first
1250 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1251 AV_FIELD_TB, //< Top coded first, bottom displayed first
1252 AV_FIELD_BT, //< Bottom coded first, top displayed first
1256 * main external API structure.
1257 * New fields can be added to the end with minor version bumps.
1258 * Removal, reordering and changes to existing fields require a major
1260 * sizeof(AVCodecContext) must not be used outside libav*.
1262 typedef struct AVCodecContext {
1264 * information on struct for av_log
1265 * - set by avcodec_alloc_context3
1267 const AVClass *av_class;
1268 int log_level_offset;
1270 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1271 struct AVCodec *codec;
1272 char codec_name[32];
1273 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1276 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1277 * This is used to work around some encoder bugs.
1278 * A demuxer should set this to what is stored in the field used to identify the codec.
1279 * If there are multiple such fields in a container then the demuxer should choose the one
1280 * which maximizes the information about the used codec.
1281 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1282 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1283 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1285 * - encoding: Set by user, if not then the default based on codec_id will be used.
1286 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1288 unsigned int codec_tag;
1291 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1292 * This is used to work around some encoder bugs.
1293 * - encoding: unused
1294 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1296 unsigned int stream_codec_tag;
1300 * @deprecated this field is unused
1302 attribute_deprecated int sub_id;
1308 * Private context used for internal data.
1310 * Unlike priv_data, this is not codec-specific. It is used in general
1311 * libavcodec functions.
1313 struct AVCodecInternal *internal;
1316 * Private data of the user, can be used to carry app specific stuff.
1317 * - encoding: Set by user.
1318 * - decoding: Set by user.
1323 * the average bitrate
1324 * - encoding: Set by user; unused for constant quantizer encoding.
1325 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1330 * number of bits the bitstream is allowed to diverge from the reference.
1331 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1332 * - encoding: Set by user; unused for constant quantizer encoding.
1333 * - decoding: unused
1335 int bit_rate_tolerance;
1338 * Global quality for codecs which cannot change it per frame.
1339 * This should be proportional to MPEG-1/2/4 qscale.
1340 * - encoding: Set by user.
1341 * - decoding: unused
1346 * - encoding: Set by user.
1347 * - decoding: unused
1349 int compression_level;
1350 #define FF_COMPRESSION_DEFAULT -1
1354 * - encoding: Set by user.
1355 * - decoding: Set by user.
1361 * - encoding: Set by user.
1362 * - decoding: Set by user.
1367 * some codecs need / can use extradata like Huffman tables.
1368 * mjpeg: Huffman tables
1369 * rv10: additional flags
1370 * mpeg4: global headers (they can be in the bitstream or here)
1371 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1372 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1373 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1374 * - encoding: Set/allocated/freed by libavcodec.
1375 * - decoding: Set/allocated/freed by user.
1381 * This is the fundamental unit of time (in seconds) in terms
1382 * of which frame timestamps are represented. For fixed-fps content,
1383 * timebase should be 1/framerate and timestamp increments should be
1385 * - encoding: MUST be set by user.
1386 * - decoding: Set by libavcodec.
1388 AVRational time_base;
1391 * For some codecs, the time base is closer to the field rate than the frame rate.
1392 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1393 * if no telecine is used ...
1395 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1397 int ticks_per_frame;
1403 * Number of frames the decoded output will be delayed relative to the
1407 * Number of "priming" samples added to the beginning of the stream
1408 * during encoding. The decoded output will be delayed by this many
1409 * samples relative to the input to the encoder. Note that this field is
1410 * purely informational and does not directly affect the pts output by
1411 * the encoder, which should always be based on the actual presentation
1412 * time, including any delay.
1414 * - encoding: Set by libavcodec.
1415 * - decoding: unused
1422 * picture width / height.
1423 * - encoding: MUST be set by user.
1424 * - decoding: Set by libavcodec.
1425 * Note: For compatibility it is possible to set this instead of
1426 * coded_width/height before decoding.
1431 * Bitstream width / height, may be different from width/height.
1432 * - encoding: unused
1433 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1435 int coded_width, coded_height;
1437 #define FF_ASPECT_EXTENDED 15
1440 * the number of pictures in a group of pictures, or 0 for intra_only
1441 * - encoding: Set by user.
1442 * - decoding: unused
1447 * Pixel format, see PIX_FMT_xxx.
1448 * May be set by the demuxer if known from headers.
1449 * May be overriden by the decoder if it knows better.
1450 * - encoding: Set by user.
1451 * - decoding: Set by user if known, overridden by libavcodec if known
1453 enum PixelFormat pix_fmt;
1456 * Motion estimation algorithm used for video coding.
1457 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1458 * 8 (umh), 9 (iter), 10 (tesa) [7, 8, 10 are x264 specific, 9 is snow specific]
1459 * - encoding: MUST be set by user.
1460 * - decoding: unused
1465 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1466 * decoder to draw a horizontal band. It improves cache usage. Not
1467 * all codecs can do that. You must check the codec capabilities
1469 * When multithreading is used, it may be called from multiple threads
1470 * at the same time; threads might draw different parts of the same AVFrame,
1471 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1473 * The function is also used by hardware acceleration APIs.
1474 * It is called at least once during frame decoding to pass
1475 * the data needed for hardware render.
1476 * In that mode instead of pixel data, AVFrame points to
1477 * a structure specific to the acceleration API. The application
1478 * reads the structure and can change some fields to indicate progress
1480 * - encoding: unused
1481 * - decoding: Set by user.
1482 * @param height the height of the slice
1483 * @param y the y position of the slice
1484 * @param type 1->top field, 2->bottom field, 3->frame
1485 * @param offset offset into the AVFrame.data from which the slice should be read
1487 void (*draw_horiz_band)(struct AVCodecContext *s,
1488 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1489 int y, int type, int height);
1492 * callback to negotiate the pixelFormat
1493 * @param fmt is the list of formats which are supported by the codec,
1494 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1495 * The first is always the native one.
1496 * @return the chosen format
1497 * - encoding: unused
1498 * - decoding: Set by user, if not set the native format will be chosen.
1500 enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);
1503 * maximum number of B-frames between non-B-frames
1504 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1505 * - encoding: Set by user.
1506 * - decoding: unused
1511 * qscale factor between IP and B-frames
1512 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1513 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1514 * - encoding: Set by user.
1515 * - decoding: unused
1517 float b_quant_factor;
1519 /** obsolete FIXME remove */
1521 #define FF_RC_STRATEGY_XVID 1
1523 int b_frame_strategy;
1525 #if FF_API_MPV_GLOBAL_OPTS
1527 * luma single coefficient elimination threshold
1528 * - encoding: Set by user.
1529 * - decoding: unused
1531 attribute_deprecated int luma_elim_threshold;
1534 * chroma single coeff elimination threshold
1535 * - encoding: Set by user.
1536 * - decoding: unused
1538 attribute_deprecated int chroma_elim_threshold;
1542 * qscale offset between IP and B-frames
1543 * - encoding: Set by user.
1544 * - decoding: unused
1546 float b_quant_offset;
1549 * Size of the frame reordering buffer in the decoder.
1550 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1551 * - encoding: Set by libavcodec.
1552 * - decoding: Set by libavcodec.
1557 * 0-> h263 quant 1-> mpeg quant
1558 * - encoding: Set by user.
1559 * - decoding: unused
1564 * qscale factor between P and I-frames
1565 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1566 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1567 * - encoding: Set by user.
1568 * - decoding: unused
1570 float i_quant_factor;
1573 * qscale offset between P and I-frames
1574 * - encoding: Set by user.
1575 * - decoding: unused
1577 float i_quant_offset;
1580 * luminance masking (0-> disabled)
1581 * - encoding: Set by user.
1582 * - decoding: unused
1587 * temporary complexity masking (0-> disabled)
1588 * - encoding: Set by user.
1589 * - decoding: unused
1591 float temporal_cplx_masking;
1594 * spatial complexity masking (0-> disabled)
1595 * - encoding: Set by user.
1596 * - decoding: unused
1598 float spatial_cplx_masking;
1601 * p block masking (0-> disabled)
1602 * - encoding: Set by user.
1603 * - decoding: unused
1608 * darkness masking (0-> disabled)
1609 * - encoding: Set by user.
1610 * - decoding: unused
1616 * - encoding: Set by libavcodec.
1617 * - decoding: Set by user (or 0).
1621 * prediction method (needed for huffyuv)
1622 * - encoding: Set by user.
1623 * - decoding: unused
1625 int prediction_method;
1626 #define FF_PRED_LEFT 0
1627 #define FF_PRED_PLANE 1
1628 #define FF_PRED_MEDIAN 2
1631 * slice offsets in the frame in bytes
1632 * - encoding: Set/allocated by libavcodec.
1633 * - decoding: Set/allocated by user (or NULL).
1638 * sample aspect ratio (0 if unknown)
1639 * That is the width of a pixel divided by the height of the pixel.
1640 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1641 * - encoding: Set by user.
1642 * - decoding: Set by libavcodec.
1644 AVRational sample_aspect_ratio;
1647 * motion estimation comparison function
1648 * - encoding: Set by user.
1649 * - decoding: unused
1653 * subpixel motion estimation comparison function
1654 * - encoding: Set by user.
1655 * - decoding: unused
1659 * macroblock comparison function (not supported yet)
1660 * - encoding: Set by user.
1661 * - decoding: unused
1665 * interlaced DCT comparison function
1666 * - encoding: Set by user.
1667 * - decoding: unused
1670 #define FF_CMP_SAD 0
1671 #define FF_CMP_SSE 1
1672 #define FF_CMP_SATD 2
1673 #define FF_CMP_DCT 3
1674 #define FF_CMP_PSNR 4
1675 #define FF_CMP_BIT 5
1677 #define FF_CMP_ZERO 7
1678 #define FF_CMP_VSAD 8
1679 #define FF_CMP_VSSE 9
1680 #define FF_CMP_NSSE 10
1681 #define FF_CMP_W53 11
1682 #define FF_CMP_W97 12
1683 #define FF_CMP_DCTMAX 13
1684 #define FF_CMP_DCT264 14
1685 #define FF_CMP_CHROMA 256
1688 * ME diamond size & shape
1689 * - encoding: Set by user.
1690 * - decoding: unused
1695 * amount of previous MV predictors (2a+1 x 2a+1 square)
1696 * - encoding: Set by user.
1697 * - decoding: unused
1699 int last_predictor_count;
1702 * prepass for motion estimation
1703 * - encoding: Set by user.
1704 * - decoding: unused
1709 * motion estimation prepass comparison function
1710 * - encoding: Set by user.
1711 * - decoding: unused
1716 * ME prepass diamond size & shape
1717 * - encoding: Set by user.
1718 * - decoding: unused
1724 * - encoding: Set by user.
1725 * - decoding: unused
1727 int me_subpel_quality;
1730 * DTG active format information (additional aspect ratio
1731 * information only used in DVB MPEG-2 transport streams)
1734 * - encoding: unused
1735 * - decoding: Set by decoder.
1737 int dtg_active_format;
1738 #define FF_DTG_AFD_SAME 8
1739 #define FF_DTG_AFD_4_3 9
1740 #define FF_DTG_AFD_16_9 10
1741 #define FF_DTG_AFD_14_9 11
1742 #define FF_DTG_AFD_4_3_SP_14_9 13
1743 #define FF_DTG_AFD_16_9_SP_14_9 14
1744 #define FF_DTG_AFD_SP_4_3 15
1747 * maximum motion estimation search range in subpel units
1748 * If 0 then no limit.
1750 * - encoding: Set by user.
1751 * - decoding: unused
1756 * intra quantizer bias
1757 * - encoding: Set by user.
1758 * - decoding: unused
1760 int intra_quant_bias;
1761 #define FF_DEFAULT_QUANT_BIAS 999999
1764 * inter quantizer bias
1765 * - encoding: Set by user.
1766 * - decoding: unused
1768 int inter_quant_bias;
1770 #if FF_API_COLOR_TABLE_ID
1773 * - encoding: unused
1774 * - decoding: Which clrtable should be used for 8bit RGB images.
1775 * Tables have to be stored somewhere. FIXME
1777 attribute_deprecated int color_table_id;
1782 * - encoding: unused
1783 * - decoding: Set by user.
1786 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1787 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1788 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1791 * XVideo Motion Acceleration
1792 * - encoding: forbidden
1793 * - decoding: set by decoder
1795 int xvmc_acceleration;
1798 * macroblock decision mode
1799 * - encoding: Set by user.
1800 * - decoding: unused
1803 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1804 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1805 #define FF_MB_DECISION_RD 2 ///< rate distortion
1808 * custom intra quantization matrix
1809 * - encoding: Set by user, can be NULL.
1810 * - decoding: Set by libavcodec.
1812 uint16_t *intra_matrix;
1815 * custom inter quantization matrix
1816 * - encoding: Set by user, can be NULL.
1817 * - decoding: Set by libavcodec.
1819 uint16_t *inter_matrix;
1822 * scene change detection threshold
1823 * 0 is default, larger means fewer detected scene changes.
1824 * - encoding: Set by user.
1825 * - decoding: unused
1827 int scenechange_threshold;
1830 * noise reduction strength
1831 * - encoding: Set by user.
1832 * - decoding: unused
1834 int noise_reduction;
1836 #if FF_API_INTER_THRESHOLD
1838 * @deprecated this field is unused
1840 attribute_deprecated int inter_threshold;
1843 #if FF_API_MPV_GLOBAL_OPTS
1845 * @deprecated use mpegvideo private options instead
1847 attribute_deprecated int quantizer_noise_shaping;
1851 * Motion estimation threshold below which no motion estimation is
1852 * performed, but instead the user specified motion vectors are used.
1854 * - encoding: Set by user.
1855 * - decoding: unused
1860 * Macroblock threshold below which the user specified macroblock types will be used.
1861 * - encoding: Set by user.
1862 * - decoding: unused
1867 * precision of the intra DC coefficient - 8
1868 * - encoding: Set by user.
1869 * - decoding: unused
1871 int intra_dc_precision;
1874 * Number of macroblock rows at the top which are skipped.
1875 * - encoding: unused
1876 * - decoding: Set by user.
1881 * Number of macroblock rows at the bottom which are skipped.
1882 * - encoding: unused
1883 * - decoding: Set by user.
1888 * Border processing masking, raises the quantizer for mbs on the borders
1890 * - encoding: Set by user.
1891 * - decoding: unused
1893 float border_masking;
1896 * minimum MB lagrange multipler
1897 * - encoding: Set by user.
1898 * - decoding: unused
1903 * maximum MB lagrange multipler
1904 * - encoding: Set by user.
1905 * - decoding: unused
1911 * - encoding: Set by user.
1912 * - decoding: unused
1914 int me_penalty_compensation;
1918 * - encoding: Set by user.
1919 * - decoding: unused
1925 * - encoding: Set by user.
1926 * - decoding: unused
1932 * - encoding: Set by user.
1933 * - decoding: unused
1938 * number of reference frames
1939 * - encoding: Set by user.
1940 * - decoding: Set by lavc.
1945 * chroma qp offset from luma
1946 * - encoding: Set by user.
1947 * - decoding: unused
1952 * Multiplied by qscale for each frame and added to scene_change_score.
1953 * - encoding: Set by user.
1954 * - decoding: unused
1956 int scenechange_factor;
1960 * Note: Value depends upon the compare function used for fullpel ME.
1961 * - encoding: Set by user.
1962 * - decoding: unused
1967 * Adjust sensitivity of b_frame_strategy 1.
1968 * - encoding: Set by user.
1969 * - decoding: unused
1974 * Chromaticity coordinates of the source primaries.
1975 * - encoding: Set by user
1976 * - decoding: Set by libavcodec
1978 enum AVColorPrimaries color_primaries;
1981 * Color Transfer Characteristic.
1982 * - encoding: Set by user
1983 * - decoding: Set by libavcodec
1985 enum AVColorTransferCharacteristic color_trc;
1988 * YUV colorspace type.
1989 * - encoding: Set by user
1990 * - decoding: Set by libavcodec
1992 enum AVColorSpace colorspace;
1995 * MPEG vs JPEG YUV range.
1996 * - encoding: Set by user
1997 * - decoding: Set by libavcodec
1999 enum AVColorRange color_range;
2002 * This defines the location of chroma samples.
2003 * - encoding: Set by user
2004 * - decoding: Set by libavcodec
2006 enum AVChromaLocation chroma_sample_location;
2010 * Indicates number of picture subdivisions. Used for parallelized
2012 * - encoding: Set by user
2013 * - decoding: unused
2018 * - encoding: set by libavcodec
2019 * - decoding: Set by libavcodec
2021 enum AVFieldOrder field_order;
2024 int sample_rate; ///< samples per second
2025 int channels; ///< number of audio channels
2028 * audio sample format
2029 * - encoding: Set by user.
2030 * - decoding: Set by libavcodec.
2032 enum AVSampleFormat sample_fmt; ///< sample format
2034 /* The following data should not be initialized. */
2036 * Samples per packet, initialized when calling 'init'.
2041 * Frame counter, set by libavcodec.
2043 * - decoding: total number of frames returned from the decoder so far.
2044 * - encoding: total number of frames passed to the encoder so far.
2046 * @note the counter is not incremented if encoding/decoding resulted in
2052 * number of bytes per packet if constant and known or 0
2053 * Used by some WAV based audio codecs.
2058 * Audio cutoff bandwidth (0 means "automatic")
2059 * - encoding: Set by user.
2060 * - decoding: unused
2064 #if FF_API_REQUEST_CHANNELS
2066 * Decoder should decode to this many channels if it can (0 for default)
2067 * - encoding: unused
2068 * - decoding: Set by user.
2069 * @deprecated Deprecated in favor of request_channel_layout.
2071 int request_channels;
2075 * Audio channel layout.
2076 * - encoding: set by user.
2077 * - decoding: set by libavcodec.
2079 uint64_t channel_layout;
2082 * Request decoder to use this channel layout if it can (0 for default)
2083 * - encoding: unused
2084 * - decoding: Set by user.
2086 uint64_t request_channel_layout;
2089 * Type of service that the audio stream conveys.
2090 * - encoding: Set by user.
2091 * - decoding: Set by libavcodec.
2093 enum AVAudioServiceType audio_service_type;
2096 * Used to request a sample format from the decoder.
2097 * - encoding: unused.
2098 * - decoding: Set by user.
2100 enum AVSampleFormat request_sample_fmt;
2103 * Called at the beginning of each frame to get a buffer for it.
2105 * The function will set AVFrame.data[], AVFrame.linesize[].
2106 * AVFrame.extended_data[] must also be set, but it should be the same as
2107 * AVFrame.data[] except for planar audio with more channels than can fit
2108 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
2109 * many data pointers as it can hold.
2111 * if CODEC_CAP_DR1 is not set then get_buffer() must call
2112 * avcodec_default_get_buffer() instead of providing buffers allocated by
2115 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
2116 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
2117 * but if get_buffer() is overridden then alignment considerations should
2118 * be taken into account.
2120 * @see avcodec_default_get_buffer()
2124 * If pic.reference is set then the frame will be read later by libavcodec.
2125 * avcodec_align_dimensions2() should be used to find the required width and
2126 * height, as they normally need to be rounded up to the next multiple of 16.
2128 * If frame multithreading is used and thread_safe_callbacks is set,
2129 * it may be called from a different thread, but not from more than one at
2130 * once. Does not need to be reentrant.
2132 * @see release_buffer(), reget_buffer()
2133 * @see avcodec_align_dimensions2()
2137 * Decoders request a buffer of a particular size by setting
2138 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
2139 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2140 * to a smaller value in the output frame.
2142 * Decoders cannot use the buffer after returning from
2143 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
2144 * is assumed to be released immediately upon return.
2146 * As a convenience, av_samples_get_buffer_size() and
2147 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
2148 * functions to find the required data size and to fill data pointers and
2149 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2150 * since all planes must be the same size.
2152 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2154 * - encoding: unused
2155 * - decoding: Set by libavcodec, user can override.
2157 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
2160 * Called to release buffers which were allocated with get_buffer.
2161 * A released buffer can be reused in get_buffer().
2162 * pic.data[*] must be set to NULL.
2163 * May be called from a different thread if frame multithreading is used,
2164 * but not by more than one thread at once, so does not need to be reentrant.
2165 * - encoding: unused
2166 * - decoding: Set by libavcodec, user can override.
2168 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
2171 * Called at the beginning of a frame to get cr buffer for it.
2172 * Buffer type (size, hints) must be the same. libavcodec won't check it.
2173 * libavcodec will pass previous buffer in pic, function should return
2174 * same buffer or new buffer with old frame "painted" into it.
2175 * If pic.data[0] == NULL must behave like get_buffer().
2176 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
2177 * avcodec_default_reget_buffer() instead of providing buffers allocated by
2179 * - encoding: unused
2180 * - decoding: Set by libavcodec, user can override.
2182 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
2185 /* - encoding parameters */
2186 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2187 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2191 * - encoding: Set by user.
2192 * - decoding: unused
2198 * - encoding: Set by user.
2199 * - decoding: unused
2204 * maximum quantizer difference between frames
2205 * - encoding: Set by user.
2206 * - decoding: unused
2211 * ratecontrol qmin qmax limiting method
2212 * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax.
2213 * - encoding: Set by user.
2214 * - decoding: unused
2222 * decoder bitstream buffer size
2223 * - encoding: Set by user.
2224 * - decoding: unused
2229 * ratecontrol override, see RcOverride
2230 * - encoding: Allocated/set/freed by user.
2231 * - decoding: unused
2233 int rc_override_count;
2234 RcOverride *rc_override;
2237 * rate control equation
2238 * - encoding: Set by user
2239 * - decoding: unused
2245 * - encoding: Set by user.
2246 * - decoding: unused
2252 * - encoding: Set by user.
2253 * - decoding: unused
2257 float rc_buffer_aggressivity;
2260 * initial complexity for pass1 ratecontrol
2261 * - encoding: Set by user.
2262 * - decoding: unused
2264 float rc_initial_cplx;
2267 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2268 * - encoding: Set by user.
2269 * - decoding: unused.
2271 float rc_max_available_vbv_use;
2274 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2275 * - encoding: Set by user.
2276 * - decoding: unused.
2278 float rc_min_vbv_overflow_use;
2281 * Number of bits which should be loaded into the rc buffer before decoding starts.
2282 * - encoding: Set by user.
2283 * - decoding: unused
2285 int rc_initial_buffer_occupancy;
2287 #define FF_CODER_TYPE_VLC 0
2288 #define FF_CODER_TYPE_AC 1
2289 #define FF_CODER_TYPE_RAW 2
2290 #define FF_CODER_TYPE_RLE 3
2291 #define FF_CODER_TYPE_DEFLATE 4
2294 * - encoding: Set by user.
2295 * - decoding: unused
2301 * - encoding: Set by user.
2302 * - decoding: unused
2307 * minimum Lagrange multipler
2308 * - encoding: Set by user.
2309 * - decoding: unused
2314 * maximum Lagrange multipler
2315 * - encoding: Set by user.
2316 * - decoding: unused
2321 * frame skip threshold
2322 * - encoding: Set by user.
2323 * - decoding: unused
2325 int frame_skip_threshold;
2329 * - encoding: Set by user.
2330 * - decoding: unused
2332 int frame_skip_factor;
2335 * frame skip exponent
2336 * - encoding: Set by user.
2337 * - decoding: unused
2342 * frame skip comparison function
2343 * - encoding: Set by user.
2344 * - decoding: unused
2349 * trellis RD quantization
2350 * - encoding: Set by user.
2351 * - decoding: unused
2356 * - encoding: Set by user.
2357 * - decoding: unused
2359 int min_prediction_order;
2362 * - encoding: Set by user.
2363 * - decoding: unused
2365 int max_prediction_order;
2368 * GOP timecode frame start number, in non drop frame format
2369 * - encoding: Set by user.
2370 * - decoding: unused
2372 int64_t timecode_frame_start;
2374 /* The RTP callback: This function is called */
2375 /* every time the encoder has a packet to send. */
2376 /* It depends on the encoder if the data starts */
2377 /* with a Start Code (it should). H.263 does. */
2378 /* mb_nb contains the number of macroblocks */
2379 /* encoded in the RTP payload. */
2380 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2382 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2383 /* do its best to deliver a chunk with size */
2384 /* below rtp_payload_size, the chunk will start */
2385 /* with a start code on some codecs like H.263. */
2386 /* This doesn't take account of any particular */
2387 /* headers inside the transmitted RTP payload. */
2389 /* statistics, used for 2-pass encoding */
2400 * number of bits used for the previously encoded frame
2401 * - encoding: Set by libavcodec.
2402 * - decoding: unused
2407 * pass1 encoding statistics output buffer
2408 * - encoding: Set by libavcodec.
2409 * - decoding: unused
2414 * pass2 encoding statistics input buffer
2415 * Concatenated stuff from stats_out of pass1 should be placed here.
2416 * - encoding: Allocated/set/freed by user.
2417 * - decoding: unused
2422 * Work around bugs in encoders which sometimes cannot be detected automatically.
2423 * - encoding: Set by user
2424 * - decoding: Set by user
2426 int workaround_bugs;
2427 #define FF_BUG_AUTODETECT 1 ///< autodetection
2428 #define FF_BUG_OLD_MSMPEG4 2
2429 #define FF_BUG_XVID_ILACE 4
2430 #define FF_BUG_UMP4 8
2431 #define FF_BUG_NO_PADDING 16
2432 #define FF_BUG_AMV 32
2433 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2434 #define FF_BUG_QPEL_CHROMA 64
2435 #define FF_BUG_STD_QPEL 128
2436 #define FF_BUG_QPEL_CHROMA2 256
2437 #define FF_BUG_DIRECT_BLOCKSIZE 512
2438 #define FF_BUG_EDGE 1024
2439 #define FF_BUG_HPEL_CHROMA 2048
2440 #define FF_BUG_DC_CLIP 4096
2441 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2442 #define FF_BUG_TRUNCATED 16384
2445 * strictly follow the standard (MPEG4, ...).
2446 * - encoding: Set by user.
2447 * - decoding: Set by user.
2448 * Setting this to STRICT or higher means the encoder and decoder will
2449 * generally do stupid things, whereas setting it to unofficial or lower
2450 * will mean the encoder might produce output that is not supported by all
2451 * spec-compliant decoders. Decoders don't differentiate between normal,
2452 * unofficial and experimental (that is, they always try to decode things
2453 * when they can) unless they are explicitly asked to behave stupidly
2454 * (=strictly conform to the specs)
2456 int strict_std_compliance;
2457 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2458 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2459 #define FF_COMPLIANCE_NORMAL 0
2460 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2461 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2464 * error concealment flags
2465 * - encoding: unused
2466 * - decoding: Set by user.
2468 int error_concealment;
2469 #define FF_EC_GUESS_MVS 1
2470 #define FF_EC_DEBLOCK 2
2474 * - encoding: Set by user.
2475 * - decoding: Set by user.
2478 #define FF_DEBUG_PICT_INFO 1
2479 #define FF_DEBUG_RC 2
2480 #define FF_DEBUG_BITSTREAM 4
2481 #define FF_DEBUG_MB_TYPE 8
2482 #define FF_DEBUG_QP 16
2483 #define FF_DEBUG_MV 32
2484 #define FF_DEBUG_DCT_COEFF 0x00000040
2485 #define FF_DEBUG_SKIP 0x00000080
2486 #define FF_DEBUG_STARTCODE 0x00000100
2487 #define FF_DEBUG_PTS 0x00000200
2488 #define FF_DEBUG_ER 0x00000400
2489 #define FF_DEBUG_MMCO 0x00000800
2490 #define FF_DEBUG_BUGS 0x00001000
2491 #define FF_DEBUG_VIS_QP 0x00002000
2492 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2493 #define FF_DEBUG_BUFFERS 0x00008000
2494 #define FF_DEBUG_THREADS 0x00010000
2498 * - encoding: Set by user.
2499 * - decoding: Set by user.
2502 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2503 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2504 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2507 * Error recognition; may misdetect some more or less valid parts as errors.
2508 * - encoding: unused
2509 * - decoding: Set by user.
2511 int err_recognition;
2512 #define AV_EF_CRCCHECK (1<<0)
2513 #define AV_EF_BITSTREAM (1<<1)
2514 #define AV_EF_BUFFER (1<<2)
2515 #define AV_EF_EXPLODE (1<<3)
2518 * opaque 64bit number (generally a PTS) that will be reordered and
2519 * output in AVFrame.reordered_opaque
2520 * @deprecated in favor of pkt_pts
2521 * - encoding: unused
2522 * - decoding: Set by user.
2524 int64_t reordered_opaque;
2527 * Hardware accelerator in use
2528 * - encoding: unused.
2529 * - decoding: Set by libavcodec
2531 struct AVHWAccel *hwaccel;
2534 * Hardware accelerator context.
2535 * For some hardware accelerators, a global context needs to be
2536 * provided by the user. In that case, this holds display-dependent
2537 * data Libav cannot instantiate itself. Please refer to the
2538 * Libav HW accelerator documentation to know how to fill this
2539 * is. e.g. for VA API, this is a struct vaapi_context.
2540 * - encoding: unused
2541 * - decoding: Set by user
2543 void *hwaccel_context;
2547 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2548 * - decoding: unused
2550 uint64_t error[AV_NUM_DATA_POINTERS];
2553 * DCT algorithm, see FF_DCT_* below
2554 * - encoding: Set by user.
2555 * - decoding: unused
2558 #define FF_DCT_AUTO 0
2559 #define FF_DCT_FASTINT 1
2560 #define FF_DCT_INT 2
2561 #define FF_DCT_MMX 3
2562 #define FF_DCT_ALTIVEC 5
2563 #define FF_DCT_FAAN 6
2566 * IDCT algorithm, see FF_IDCT_* below.
2567 * - encoding: Set by user.
2568 * - decoding: Set by user.
2571 #define FF_IDCT_AUTO 0
2572 #define FF_IDCT_INT 1
2573 #define FF_IDCT_SIMPLE 2
2574 #define FF_IDCT_SIMPLEMMX 3
2575 #define FF_IDCT_LIBMPEG2MMX 4
2576 #define FF_IDCT_MMI 5
2577 #define FF_IDCT_ARM 7
2578 #define FF_IDCT_ALTIVEC 8
2579 #define FF_IDCT_SH4 9
2580 #define FF_IDCT_SIMPLEARM 10
2581 #define FF_IDCT_H264 11
2582 #define FF_IDCT_VP3 12
2583 #define FF_IDCT_IPP 13
2584 #define FF_IDCT_XVIDMMX 14
2585 #define FF_IDCT_CAVS 15
2586 #define FF_IDCT_SIMPLEARMV5TE 16
2587 #define FF_IDCT_SIMPLEARMV6 17
2588 #define FF_IDCT_SIMPLEVIS 18
2589 #define FF_IDCT_WMV2 19
2590 #define FF_IDCT_FAAN 20
2591 #define FF_IDCT_EA 21
2592 #define FF_IDCT_SIMPLENEON 22
2593 #define FF_IDCT_SIMPLEALPHA 23
2594 #define FF_IDCT_BINK 24
2599 * @deprecated use av_set_cpu_flags_mask() instead.
2601 attribute_deprecated unsigned dsp_mask;
2605 * bits per sample/pixel from the demuxer (needed for huffyuv).
2606 * - encoding: Set by libavcodec.
2607 * - decoding: Set by user.
2609 int bits_per_coded_sample;
2612 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2613 * - encoding: set by user.
2614 * - decoding: set by libavcodec.
2616 int bits_per_raw_sample;
2619 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2620 * - encoding: unused
2621 * - decoding: Set by user.
2623 attribute_deprecated int lowres;
2626 * the picture in the bitstream
2627 * - encoding: Set by libavcodec.
2628 * - decoding: Set by libavcodec.
2630 AVFrame *coded_frame;
2634 * is used to decide how many independent tasks should be passed to execute()
2635 * - encoding: Set by user.
2636 * - decoding: Set by user.
2641 * Which multithreading methods to use.
2642 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2643 * so clients which cannot provide future frames should not use it.
2645 * - encoding: Set by user, otherwise the default is used.
2646 * - decoding: Set by user, otherwise the default is used.
2649 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2650 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2653 * Which multithreading methods are in use by the codec.
2654 * - encoding: Set by libavcodec.
2655 * - decoding: Set by libavcodec.
2657 int active_thread_type;
2660 * Set by the client if its custom get_buffer() callback can be called
2661 * synchronously from another thread, which allows faster multithreaded decoding.
2662 * draw_horiz_band() will be called from other threads regardless of this setting.
2663 * Ignored if the default get_buffer() is used.
2664 * - encoding: Set by user.
2665 * - decoding: Set by user.
2667 int thread_safe_callbacks;
2670 * The codec may call this to execute several independent things.
2671 * It will return only after finishing all tasks.
2672 * The user may replace this with some multithreaded implementation,
2673 * the default implementation will execute the parts serially.
2674 * @param count the number of things to execute
2675 * - encoding: Set by libavcodec, user can override.
2676 * - decoding: Set by libavcodec, user can override.
2678 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2681 * The codec may call this to execute several independent things.
2682 * It will return only after finishing all tasks.
2683 * The user may replace this with some multithreaded implementation,
2684 * the default implementation will execute the parts serially.
2685 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2686 * @param c context passed also to func
2687 * @param count the number of things to execute
2688 * @param arg2 argument passed unchanged to func
2689 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2690 * @param func function that will be called count times, with jobnr from 0 to count-1.
2691 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2692 * two instances of func executing at the same time will have the same threadnr.
2693 * @return always 0 currently, but code should handle a future improvement where when any call to func
2694 * returns < 0 no further calls to func may be done and < 0 is returned.
2695 * - encoding: Set by libavcodec, user can override.
2696 * - decoding: Set by libavcodec, user can override.
2698 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2702 * Can be used by execute() to store some per AVCodecContext stuff.
2703 * - encoding: set by execute()
2704 * - decoding: set by execute()
2706 void *thread_opaque;
2709 * noise vs. sse weight for the nsse comparsion function
2710 * - encoding: Set by user.
2711 * - decoding: unused
2717 * - encoding: Set by user.
2718 * - decoding: Set by libavcodec.
2721 #define FF_PROFILE_UNKNOWN -99
2722 #define FF_PROFILE_RESERVED -100
2724 #define FF_PROFILE_AAC_MAIN 0
2725 #define FF_PROFILE_AAC_LOW 1
2726 #define FF_PROFILE_AAC_SSR 2
2727 #define FF_PROFILE_AAC_LTP 3
2728 #define FF_PROFILE_AAC_HE 4
2729 #define FF_PROFILE_AAC_HE_V2 28
2730 #define FF_PROFILE_AAC_LD 22
2731 #define FF_PROFILE_AAC_ELD 38
2733 #define FF_PROFILE_DTS 20
2734 #define FF_PROFILE_DTS_ES 30
2735 #define FF_PROFILE_DTS_96_24 40
2736 #define FF_PROFILE_DTS_HD_HRA 50
2737 #define FF_PROFILE_DTS_HD_MA 60
2739 #define FF_PROFILE_MPEG2_422 0
2740 #define FF_PROFILE_MPEG2_HIGH 1
2741 #define FF_PROFILE_MPEG2_SS 2
2742 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2743 #define FF_PROFILE_MPEG2_MAIN 4
2744 #define FF_PROFILE_MPEG2_SIMPLE 5
2746 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2747 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2749 #define FF_PROFILE_H264_BASELINE 66
2750 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2751 #define FF_PROFILE_H264_MAIN 77
2752 #define FF_PROFILE_H264_EXTENDED 88
2753 #define FF_PROFILE_H264_HIGH 100
2754 #define FF_PROFILE_H264_HIGH_10 110
2755 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2756 #define FF_PROFILE_H264_HIGH_422 122
2757 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2758 #define FF_PROFILE_H264_HIGH_444 144
2759 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2760 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2761 #define FF_PROFILE_H264_CAVLC_444 44
2763 #define FF_PROFILE_VC1_SIMPLE 0
2764 #define FF_PROFILE_VC1_MAIN 1
2765 #define FF_PROFILE_VC1_COMPLEX 2
2766 #define FF_PROFILE_VC1_ADVANCED 3
2768 #define FF_PROFILE_MPEG4_SIMPLE 0
2769 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2770 #define FF_PROFILE_MPEG4_CORE 2
2771 #define FF_PROFILE_MPEG4_MAIN 3
2772 #define FF_PROFILE_MPEG4_N_BIT 4
2773 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2774 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2775 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2776 #define FF_PROFILE_MPEG4_HYBRID 8
2777 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2778 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2779 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2780 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2781 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2782 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2783 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2787 * - encoding: Set by user.
2788 * - decoding: Set by libavcodec.
2791 #define FF_LEVEL_UNKNOWN -99
2795 * - encoding: unused
2796 * - decoding: Set by user.
2798 enum AVDiscard skip_loop_filter;
2802 * - encoding: unused
2803 * - decoding: Set by user.
2805 enum AVDiscard skip_idct;
2809 * - encoding: unused
2810 * - decoding: Set by user.
2812 enum AVDiscard skip_frame;
2815 * Header containing style information for text subtitles.
2816 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2817 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2818 * the Format line following. It shouldn't include any Dialogue line.
2819 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2820 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2822 uint8_t *subtitle_header;
2823 int subtitle_header_size;
2826 * Simulates errors in the bitstream to test error concealment.
2827 * - encoding: Set by user.
2828 * - decoding: unused
2833 * Current packet as passed into the decoder, to avoid having
2834 * to pass the packet into every function. Currently only valid
2835 * inside lavc and get/release_buffer callbacks.
2836 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2837 * - encoding: unused
2842 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2843 * Used for compliant TS muxing.
2844 * - encoding: Set by libavcodec.
2845 * - decoding: unused.
2853 typedef struct AVProfile {
2855 const char *name; ///< short name for the profile
2858 typedef struct AVCodecDefault AVCodecDefault;
2863 typedef struct AVCodec {
2865 * Name of the codec implementation.
2866 * The name is globally unique among encoders and among decoders (but an
2867 * encoder and a decoder can share the same name).
2868 * This is the primary way to find a codec from the user perspective.
2872 * Descriptive name for the codec, meant to be more human readable than name.
2873 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2875 const char *long_name;
2876 enum AVMediaType type;
2879 * Codec capabilities.
2883 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2884 const enum PixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2885 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2886 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2887 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2888 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2889 const AVClass *priv_class; ///< AVClass for the private context
2890 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2892 /*****************************************************************
2893 * No fields below this line are part of the public API. They
2894 * may not be used outside of libavcodec and can be changed and
2896 * New public fields should be added right above.
2897 *****************************************************************
2900 struct AVCodec *next;
2902 * @name Frame-level threading support functions
2906 * If defined, called on thread contexts when they are created.
2907 * If the codec allocates writable tables in init(), re-allocate them here.
2908 * priv_data will be set to a copy of the original.
2910 int (*init_thread_copy)(AVCodecContext *);
2912 * Copy necessary context variables from a previous thread context to the current one.
2913 * If not defined, the next thread will start automatically; otherwise, the codec
2914 * must call ff_thread_finish_setup().
2916 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2918 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2922 * Private codec-specific defaults.
2924 const AVCodecDefault *defaults;
2927 * Initialize codec static data, called from avcodec_register().
2929 void (*init_static_data)(struct AVCodec *codec);
2931 int (*init)(AVCodecContext *);
2932 int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
2934 * Encode data to an AVPacket.
2936 * @param avctx codec context
2937 * @param avpkt output AVPacket (may contain a user-provided buffer)
2938 * @param[in] frame AVFrame containing the raw data to be encoded
2939 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2940 * non-empty packet was returned in avpkt.
2941 * @return 0 on success, negative error code on failure
2943 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2944 int *got_packet_ptr);
2945 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2946 int (*close)(AVCodecContext *);
2949 * Will be called when seeking
2951 void (*flush)(AVCodecContext *);
2957 typedef struct AVHWAccel {
2959 * Name of the hardware accelerated codec.
2960 * The name is globally unique among encoders and among decoders (but an
2961 * encoder and a decoder can share the same name).
2966 * Type of codec implemented by the hardware accelerator.
2968 * See AVMEDIA_TYPE_xxx
2970 enum AVMediaType type;
2973 * Codec implemented by the hardware accelerator.
2975 * See AV_CODEC_ID_xxx
2980 * Supported pixel format.
2982 * Only hardware accelerated formats are supported here.
2984 enum PixelFormat pix_fmt;
2987 * Hardware accelerated codec capabilities.
2988 * see FF_HWACCEL_CODEC_CAP_*
2992 struct AVHWAccel *next;
2995 * Called at the beginning of each frame or field picture.
2997 * Meaningful frame information (codec specific) is guaranteed to
2998 * be parsed at this point. This function is mandatory.
3000 * Note that buf can be NULL along with buf_size set to 0.
3001 * Otherwise, this means the whole frame is available at this point.
3003 * @param avctx the codec context
3004 * @param buf the frame data buffer base
3005 * @param buf_size the size of the frame in bytes
3006 * @return zero if successful, a negative value otherwise
3008 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3011 * Callback for each slice.
3013 * Meaningful slice information (codec specific) is guaranteed to
3014 * be parsed at this point. This function is mandatory.
3016 * @param avctx the codec context
3017 * @param buf the slice data buffer base
3018 * @param buf_size the size of the slice in bytes
3019 * @return zero if successful, a negative value otherwise
3021 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3024 * Called at the end of each frame or field picture.
3026 * The whole picture is parsed at this point and can now be sent
3027 * to the hardware accelerator. This function is mandatory.
3029 * @param avctx the codec context
3030 * @return zero if successful, a negative value otherwise
3032 int (*end_frame)(AVCodecContext *avctx);
3035 * Size of HW accelerator private data.
3037 * Private data is allocated with av_mallocz() before
3038 * AVCodecContext.get_buffer() and deallocated after
3039 * AVCodecContext.release_buffer().
3045 * @defgroup lavc_picture AVPicture
3047 * Functions for working with AVPicture
3052 * four components are given, that's all.
3053 * the last component is alpha
3055 typedef struct AVPicture {
3056 uint8_t *data[AV_NUM_DATA_POINTERS];
3057 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3064 #define AVPALETTE_SIZE 1024
3065 #define AVPALETTE_COUNT 256
3067 enum AVSubtitleType {
3070 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3073 * Plain text, the text field must be set by the decoder and is
3074 * authoritative. ass and pict fields may contain approximations.
3079 * Formatted text, the ass field must be set by the decoder and is
3080 * authoritative. pict and text fields may contain approximations.
3085 typedef struct AVSubtitleRect {
3086 int x; ///< top left corner of pict, undefined when pict is not set
3087 int y; ///< top left corner of pict, undefined when pict is not set
3088 int w; ///< width of pict, undefined when pict is not set
3089 int h; ///< height of pict, undefined when pict is not set
3090 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3093 * data+linesize for the bitmap of this subtitle.
3094 * can be set for text/ass as well once they where rendered
3097 enum AVSubtitleType type;
3099 char *text; ///< 0 terminated plain UTF-8 text
3102 * 0 terminated ASS/SSA compatible event line.
3103 * The pressentation of this is unaffected by the other values in this
3109 typedef struct AVSubtitle {
3110 uint16_t format; /* 0 = graphics */
3111 uint32_t start_display_time; /* relative to packet pts, in ms */
3112 uint32_t end_display_time; /* relative to packet pts, in ms */
3114 AVSubtitleRect **rects;
3115 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3119 * If c is NULL, returns the first registered codec,
3120 * if c is non-NULL, returns the next registered codec after c,
3121 * or NULL if c is the last one.
3123 AVCodec *av_codec_next(AVCodec *c);
3126 * Return the LIBAVCODEC_VERSION_INT constant.
3128 unsigned avcodec_version(void);
3131 * Return the libavcodec build-time configuration.
3133 const char *avcodec_configuration(void);
3136 * Return the libavcodec license.
3138 const char *avcodec_license(void);
3141 * Register the codec codec and initialize libavcodec.
3143 * @warning either this function or avcodec_register_all() must be called
3144 * before any other libavcodec functions.
3146 * @see avcodec_register_all()
3148 void avcodec_register(AVCodec *codec);
3151 * Register all the codecs, parsers and bitstream filters which were enabled at
3152 * configuration time. If you do not call this function you can select exactly
3153 * which formats you want to support, by using the individual registration
3156 * @see avcodec_register
3157 * @see av_register_codec_parser
3158 * @see av_register_bitstream_filter
3160 void avcodec_register_all(void);
3163 * Allocate an AVCodecContext and set its fields to default values. The
3164 * resulting struct can be deallocated by calling avcodec_close() on it followed
3167 * @param codec if non-NULL, allocate private data and initialize defaults
3168 * for the given codec. It is illegal to then call avcodec_open2()
3169 * with a different codec.
3170 * If NULL, then the codec-specific defaults won't be initialized,
3171 * which may result in suboptimal default settings (this is
3172 * important mainly for encoders, e.g. libx264).
3174 * @return An AVCodecContext filled with default values or NULL on failure.
3175 * @see avcodec_get_context_defaults
3177 AVCodecContext *avcodec_alloc_context3(AVCodec *codec);
3180 * Set the fields of the given AVCodecContext to default values corresponding
3181 * to the given codec (defaults may be codec-dependent).
3183 * Do not call this function if a non-NULL codec has been passed
3184 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3185 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3186 * different codec on this AVCodecContext.
3188 int avcodec_get_context_defaults3(AVCodecContext *s, AVCodec *codec);
3191 * Get the AVClass for AVCodecContext. It can be used in combination with
3192 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3194 * @see av_opt_find().
3196 const AVClass *avcodec_get_class(void);
3199 * Copy the settings of the source AVCodecContext into the destination
3200 * AVCodecContext. The resulting destination codec context will be
3201 * unopened, i.e. you are required to call avcodec_open2() before you
3202 * can use this AVCodecContext to decode/encode video/audio data.
3204 * @param dest target codec context, should be initialized with
3205 * avcodec_alloc_context3(), but otherwise uninitialized
3206 * @param src source codec context
3207 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3209 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3212 * Allocate an AVFrame and set its fields to default values. The resulting
3213 * struct can be deallocated by simply calling av_free().
3215 * @return An AVFrame filled with default values or NULL on failure.
3216 * @see avcodec_get_frame_defaults
3218 AVFrame *avcodec_alloc_frame(void);
3221 * Set the fields of the given AVFrame to default values.
3223 * @param pic The AVFrame of which the fields should be set to default values.
3225 void avcodec_get_frame_defaults(AVFrame *pic);
3228 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3229 * function the context has to be allocated with avcodec_alloc_context3().
3231 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3232 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3233 * retrieving a codec.
3235 * @warning This function is not thread safe!
3238 * avcodec_register_all();
3239 * av_dict_set(&opts, "b", "2.5M", 0);
3240 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3244 * context = avcodec_alloc_context3(codec);
3246 * if (avcodec_open2(context, codec, opts) < 0)
3250 * @param avctx The context to initialize.
3251 * @param codec The codec to open this context for. If a non-NULL codec has been
3252 * previously passed to avcodec_alloc_context3() or
3253 * avcodec_get_context_defaults3() for this context, then this
3254 * parameter MUST be either NULL or equal to the previously passed
3256 * @param options A dictionary filled with AVCodecContext and codec-private options.
3257 * On return this object will be filled with options that were not found.
3259 * @return zero on success, a negative value on error
3260 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3261 * av_dict_set(), av_opt_find().
3263 int avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options);
3266 * Close a given AVCodecContext and free all the data associated with it
3267 * (but not the AVCodecContext itself).
3269 * Calling this function on an AVCodecContext that hasn't been opened will free
3270 * the codec-specific data allocated in avcodec_alloc_context3() /
3271 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3274 int avcodec_close(AVCodecContext *avctx);
3277 * Free all allocated data in the given subtitle struct.
3279 * @param sub AVSubtitle to free.
3281 void avsubtitle_free(AVSubtitle *sub);
3288 * @addtogroup lavc_packet
3293 * @deprecated use NULL instead
3295 attribute_deprecated void av_destruct_packet_nofree(AVPacket *pkt);
3298 * Default packet destructor.
3300 void av_destruct_packet(AVPacket *pkt);
3303 * Initialize optional fields of a packet with default values.
3305 * Note, this does not touch the data and size members, which have to be
3306 * initialized separately.
3310 void av_init_packet(AVPacket *pkt);
3313 * Allocate the payload of a packet and initialize its fields with
3317 * @param size wanted payload size
3318 * @return 0 if OK, AVERROR_xxx otherwise
3320 int av_new_packet(AVPacket *pkt, int size);
3323 * Reduce packet size, correctly zeroing padding
3326 * @param size new size
3328 void av_shrink_packet(AVPacket *pkt, int size);
3331 * Increase packet size, correctly zeroing padding
3334 * @param grow_by number of bytes by which to increase the size of the packet
3336 int av_grow_packet(AVPacket *pkt, int grow_by);
3339 * @warning This is a hack - the packet memory allocation stuff is broken. The
3340 * packet is allocated if it was not really allocated.
3342 int av_dup_packet(AVPacket *pkt);
3347 * @param pkt packet to free
3349 void av_free_packet(AVPacket *pkt);
3352 * Allocate new information of a packet.
3355 * @param type side information type
3356 * @param size side information size
3357 * @return pointer to fresh allocated data or NULL otherwise
3359 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3363 * Shrink the already allocated side data buffer
3366 * @param type side information type
3367 * @param size new side information size
3368 * @return 0 on success, < 0 on failure
3370 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3374 * Get side information from packet.
3377 * @param type desired side information type
3378 * @param size pointer for side information size to store (optional)
3379 * @return pointer to data if present or NULL otherwise
3381 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3389 * @addtogroup lavc_decoding
3394 * Find a registered decoder with a matching codec ID.
3396 * @param id AVCodecID of the requested decoder
3397 * @return A decoder if one was found, NULL otherwise.
3399 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3402 * Find a registered decoder with the specified name.
3404 * @param name name of the requested decoder
3405 * @return A decoder if one was found, NULL otherwise.
3407 AVCodec *avcodec_find_decoder_by_name(const char *name);
3409 int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3410 void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3411 int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3414 * Return the amount of padding in pixels which the get_buffer callback must
3415 * provide around the edge of the image for codecs which do not have the
3416 * CODEC_FLAG_EMU_EDGE flag.
3418 * @return Required padding in pixels.
3420 unsigned avcodec_get_edge_width(void);
3423 * Modify width and height values so that they will result in a memory
3424 * buffer that is acceptable for the codec if you do not use any horizontal
3427 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3428 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3429 * according to avcodec_get_edge_width() before.
3431 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3434 * Modify width and height values so that they will result in a memory
3435 * buffer that is acceptable for the codec if you also ensure that all
3436 * line sizes are a multiple of the respective linesize_align[i].
3438 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3439 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3440 * according to avcodec_get_edge_width() before.
3442 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3443 int linesize_align[AV_NUM_DATA_POINTERS]);
3445 #if FF_API_OLD_DECODE_AUDIO
3447 * Wrapper function which calls avcodec_decode_audio4.
3449 * @deprecated Use avcodec_decode_audio4 instead.
3451 * Decode the audio frame of size avpkt->size from avpkt->data into samples.
3452 * Some decoders may support multiple frames in a single AVPacket, such
3453 * decoders would then just decode the first frame. In this case,
3454 * avcodec_decode_audio3 has to be called again with an AVPacket that contains
3455 * the remaining data in order to decode the second frame etc.
3457 * could be outputted, frame_size_ptr is zero. Otherwise, it is the
3458 * decompressed frame size in bytes.
3460 * @warning You must set frame_size_ptr to the allocated size of the
3461 * output buffer before calling avcodec_decode_audio3().
3463 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3464 * the actual read bytes because some optimized bitstream readers read 32 or 64
3465 * bits at once and could read over the end.
3467 * @warning The end of the input buffer avpkt->data should be set to 0 to ensure that
3468 * no overreading happens for damaged MPEG streams.
3470 * @warning You must not provide a custom get_buffer() when using
3471 * avcodec_decode_audio3(). Doing so will override it with
3472 * avcodec_default_get_buffer. Use avcodec_decode_audio4() instead,
3473 * which does allow the application to provide a custom get_buffer().
3475 * @note You might have to align the input buffer avpkt->data and output buffer
3476 * samples. The alignment requirements depend on the CPU: On some CPUs it isn't
3477 * necessary at all, on others it won't work at all if not aligned and on others
3478 * it will work but it will have an impact on performance.
3480 * In practice, avpkt->data should have 4 byte alignment at minimum and
3481 * samples should be 16 byte aligned unless the CPU doesn't need it
3482 * (AltiVec and SSE do).
3484 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3485 * between input and output, these need to be fed with avpkt->data=NULL,
3486 * avpkt->size=0 at the end to return the remaining frames.
3488 * @param avctx the codec context
3489 * @param[out] samples the output buffer, sample type in avctx->sample_fmt
3490 * If the sample format is planar, each channel plane will
3491 * be the same size, with no padding between channels.
3492 * @param[in,out] frame_size_ptr the output buffer size in bytes
3493 * @param[in] avpkt The input AVPacket containing the input buffer.
3494 * You can create such packet with av_init_packet() and by then setting
3495 * data and size, some decoders might in addition need other fields.
3496 * All decoders are designed to use the least fields possible though.
3497 * @return On error a negative value is returned, otherwise the number of bytes
3498 * used or zero if no frame data was decompressed (used) from the input AVPacket.
3500 attribute_deprecated int avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
3501 int *frame_size_ptr,
3506 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3508 * Some decoders may support multiple frames in a single AVPacket. Such
3509 * decoders would then just decode the first frame. In this case,
3510 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3511 * the remaining data in order to decode the second frame, etc...
3512 * Even if no frames are returned, the packet needs to be fed to the decoder
3513 * with remaining data until it is completely consumed or an error occurs.
3515 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3516 * larger than the actual read bytes because some optimized bitstream
3517 * readers read 32 or 64 bits at once and could read over the end.
3519 * @note You might have to align the input buffer. The alignment requirements
3520 * depend on the CPU and the decoder.
3522 * @param avctx the codec context
3523 * @param[out] frame The AVFrame in which to store decoded audio samples.
3524 * Decoders request a buffer of a particular size by setting
3525 * AVFrame.nb_samples prior to calling get_buffer(). The
3526 * decoder may, however, only utilize part of the buffer by
3527 * setting AVFrame.nb_samples to a smaller value in the
3529 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3531 * @param[in] avpkt The input AVPacket containing the input buffer.
3532 * At least avpkt->data and avpkt->size should be set. Some
3533 * decoders might also require additional fields to be set.
3534 * @return A negative error code is returned if an error occurred during
3535 * decoding, otherwise the number of bytes consumed from the input
3536 * AVPacket is returned.
3538 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3539 int *got_frame_ptr, AVPacket *avpkt);
3542 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3543 * Some decoders may support multiple frames in a single AVPacket, such
3544 * decoders would then just decode the first frame.
3546 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3547 * the actual read bytes because some optimized bitstream readers read 32 or 64
3548 * bits at once and could read over the end.
3550 * @warning The end of the input buffer buf should be set to 0 to ensure that
3551 * no overreading happens for damaged MPEG streams.
3553 * @note You might have to align the input buffer avpkt->data.
3554 * The alignment requirements depend on the CPU: on some CPUs it isn't
3555 * necessary at all, on others it won't work at all if not aligned and on others
3556 * it will work but it will have an impact on performance.
3558 * In practice, avpkt->data should have 4 byte alignment at minimum.
3560 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3561 * between input and output, these need to be fed with avpkt->data=NULL,
3562 * avpkt->size=0 at the end to return the remaining frames.
3564 * @param avctx the codec context
3565 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3566 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3567 * allocate memory for the actual bitmap.
3568 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3569 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3570 * decodes and the decoder tells the user once it does not need the data anymore,
3571 * the user app can at this point free/reuse/keep the memory as it sees fit.
3573 * @param[in] avpkt The input AVpacket containing the input buffer.
3574 * You can create such packet with av_init_packet() and by then setting
3575 * data and size, some decoders might in addition need other fields like
3576 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3578 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3579 * @return On error a negative value is returned, otherwise the number of bytes
3580 * used or zero if no frame could be decompressed.
3582 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3583 int *got_picture_ptr,
3587 * Decode a subtitle message.
3588 * Return a negative value on error, otherwise return the number of bytes used.
3589 * If no subtitle could be decompressed, got_sub_ptr is zero.
3590 * Otherwise, the subtitle is stored in *sub.
3591 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3592 * simplicity, because the performance difference is expect to be negligible
3593 * and reusing a get_buffer written for video codecs would probably perform badly
3594 * due to a potentially very different allocation pattern.
3596 * @param avctx the codec context
3597 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3598 freed with avsubtitle_free if *got_sub_ptr is set.
3599 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3600 * @param[in] avpkt The input AVPacket containing the input buffer.
3602 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3607 * @defgroup lavc_parsing Frame parsing
3611 typedef struct AVCodecParserContext {
3613 struct AVCodecParser *parser;
3614 int64_t frame_offset; /* offset of the current frame */
3615 int64_t cur_offset; /* current offset
3616 (incremented by each av_parser_parse()) */
3617 int64_t next_frame_offset; /* offset of the next frame */
3619 int pict_type; /* XXX: Put it back in AVCodecContext. */
3621 * This field is used for proper frame duration computation in lavf.
3622 * It signals, how much longer the frame duration of the current frame
3623 * is compared to normal frame duration.
3625 * frame_duration = (1 + repeat_pict) * time_base
3627 * It is used by codecs like H.264 to display telecined material.
3629 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3630 int64_t pts; /* pts of the current frame */
3631 int64_t dts; /* dts of the current frame */
3636 int fetch_timestamp;
3638 #define AV_PARSER_PTS_NB 4
3639 int cur_frame_start_index;
3640 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3641 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3642 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3645 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3646 #define PARSER_FLAG_ONCE 0x0002
3647 /// Set if the parser has a valid file offset
3648 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3650 int64_t offset; ///< byte offset from starting packet start
3651 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3654 * Set by parser to 1 for key frames and 0 for non-key frames.
3655 * It is initialized to -1, so if the parser doesn't set this flag,
3656 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3662 * Time difference in stream time base units from the pts of this
3663 * packet to the point at which the output from the decoder has converged
3664 * independent from the availability of previous frames. That is, the
3665 * frames are virtually identical no matter if decoding started from
3666 * the very first frame or from this keyframe.
3667 * Is AV_NOPTS_VALUE if unknown.
3668 * This field is not the display duration of the current frame.
3669 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3672 * The purpose of this field is to allow seeking in streams that have no
3673 * keyframes in the conventional sense. It corresponds to the
3674 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3675 * essential for some types of subtitle streams to ensure that all
3676 * subtitles are correctly displayed after seeking.
3678 int64_t convergence_duration;
3680 // Timestamp generation support:
3682 * Synchronization point for start of timestamp generation.
3684 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3687 * For example, this corresponds to presence of H.264 buffering period
3693 * Offset of the current timestamp against last timestamp sync point in
3694 * units of AVCodecContext.time_base.
3696 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3697 * contain a valid timestamp offset.
3699 * Note that the timestamp of sync point has usually a nonzero
3700 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3701 * the next frame after timestamp sync point will be usually 1.
3703 * For example, this corresponds to H.264 cpb_removal_delay.
3705 int dts_ref_dts_delta;
3708 * Presentation delay of current frame in units of AVCodecContext.time_base.
3710 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3711 * contain valid non-negative timestamp delta (presentation time of a frame
3712 * must not lie in the past).
3714 * This delay represents the difference between decoding and presentation
3715 * time of the frame.
3717 * For example, this corresponds to H.264 dpb_output_delay.
3722 * Position of the packet in file.
3724 * Analogous to cur_frame_pts/dts
3726 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3729 * Byte position of currently parsed frame in stream.
3734 * Previous frame byte position.
3739 * Duration of the current frame.
3740 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3741 * For all other types, this is in units of AVCodecContext.time_base.
3744 } AVCodecParserContext;
3746 typedef struct AVCodecParser {
3747 int codec_ids[5]; /* several codec IDs are permitted */
3749 int (*parser_init)(AVCodecParserContext *s);
3750 int (*parser_parse)(AVCodecParserContext *s,
3751 AVCodecContext *avctx,
3752 const uint8_t **poutbuf, int *poutbuf_size,
3753 const uint8_t *buf, int buf_size);
3754 void (*parser_close)(AVCodecParserContext *s);
3755 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3756 struct AVCodecParser *next;
3759 AVCodecParser *av_parser_next(AVCodecParser *c);
3761 void av_register_codec_parser(AVCodecParser *parser);
3762 AVCodecParserContext *av_parser_init(int codec_id);
3767 * @param s parser context.
3768 * @param avctx codec context.
3769 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3770 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3771 * @param buf input buffer.
3772 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3773 * @param pts input presentation timestamp.
3774 * @param dts input decoding timestamp.
3775 * @param pos input byte position in stream.
3776 * @return the number of bytes of the input bitstream used.
3781 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3788 * decode_frame(data, size);
3792 int av_parser_parse2(AVCodecParserContext *s,
3793 AVCodecContext *avctx,
3794 uint8_t **poutbuf, int *poutbuf_size,
3795 const uint8_t *buf, int buf_size,
3796 int64_t pts, int64_t dts,
3799 int av_parser_change(AVCodecParserContext *s,
3800 AVCodecContext *avctx,
3801 uint8_t **poutbuf, int *poutbuf_size,
3802 const uint8_t *buf, int buf_size, int keyframe);
3803 void av_parser_close(AVCodecParserContext *s);
3811 * @addtogroup lavc_encoding
3816 * Find a registered encoder with a matching codec ID.
3818 * @param id AVCodecID of the requested encoder
3819 * @return An encoder if one was found, NULL otherwise.
3821 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3824 * Find a registered encoder with the specified name.
3826 * @param name name of the requested encoder
3827 * @return An encoder if one was found, NULL otherwise.
3829 AVCodec *avcodec_find_encoder_by_name(const char *name);
3831 #if FF_API_OLD_ENCODE_AUDIO
3833 * Encode an audio frame from samples into buf.
3835 * @deprecated Use avcodec_encode_audio2 instead.
3837 * @note The output buffer should be at least FF_MIN_BUFFER_SIZE bytes large.
3838 * However, for codecs with avctx->frame_size equal to 0 (e.g. PCM) the user
3839 * will know how much space is needed because it depends on the value passed
3840 * in buf_size as described below. In that case a lower value can be used.
3842 * @param avctx the codec context
3843 * @param[out] buf the output buffer
3844 * @param[in] buf_size the output buffer size
3845 * @param[in] samples the input buffer containing the samples
3846 * The number of samples read from this buffer is frame_size*channels,
3847 * both of which are defined in avctx.
3848 * For codecs which have avctx->frame_size equal to 0 (e.g. PCM) the number of
3849 * samples read from samples is equal to:
3850 * buf_size * 8 / (avctx->channels * av_get_bits_per_sample(avctx->codec_id))
3851 * This also implies that av_get_bits_per_sample() must not return 0 for these
3853 * @return On error a negative value is returned, on success zero or the number
3854 * of bytes used to encode the data read from the input buffer.
3856 int attribute_deprecated avcodec_encode_audio(AVCodecContext *avctx,
3857 uint8_t *buf, int buf_size,
3858 const short *samples);
3862 * Encode a frame of audio.
3864 * Takes input samples from frame and writes the next output packet, if
3865 * available, to avpkt. The output packet does not necessarily contain data for
3866 * the most recent frame, as encoders can delay, split, and combine input frames
3867 * internally as needed.
3869 * @param avctx codec context
3870 * @param avpkt output AVPacket.
3871 * The user can supply an output buffer by setting
3872 * avpkt->data and avpkt->size prior to calling the
3873 * function, but if the size of the user-provided data is not
3874 * large enough, encoding will fail. All other AVPacket fields
3875 * will be reset by the encoder using av_init_packet(). If
3876 * avpkt->data is NULL, the encoder will allocate it.
3877 * The encoder will set avpkt->size to the size of the
3880 * If this function fails or produces no output, avpkt will be
3881 * freed using av_free_packet() (i.e. avpkt->destruct will be
3882 * called to free the user supplied buffer).
3883 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3884 * May be NULL when flushing an encoder that has the
3885 * CODEC_CAP_DELAY capability set.
3886 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3887 * can have any number of samples.
3888 * If it is not set, frame->nb_samples must be equal to
3889 * avctx->frame_size for all frames except the last.
3890 * The final frame may be smaller than avctx->frame_size.
3891 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3892 * output packet is non-empty, and to 0 if it is
3893 * empty. If the function returns an error, the
3894 * packet can be assumed to be invalid, and the
3895 * value of got_packet_ptr is undefined and should
3897 * @return 0 on success, negative error code on failure
3899 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3900 const AVFrame *frame, int *got_packet_ptr);
3902 #if FF_API_OLD_ENCODE_VIDEO
3904 * @deprecated use avcodec_encode_video2() instead.
3906 * Encode a video frame from pict into buf.
3907 * The input picture should be
3908 * stored using a specific format, namely avctx.pix_fmt.
3910 * @param avctx the codec context
3911 * @param[out] buf the output buffer for the bitstream of encoded frame
3912 * @param[in] buf_size the size of the output buffer in bytes
3913 * @param[in] pict the input picture to encode
3914 * @return On error a negative value is returned, on success zero or the number
3915 * of bytes used from the output buffer.
3917 attribute_deprecated
3918 int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3919 const AVFrame *pict);
3923 * Encode a frame of video.
3925 * Takes input raw video data from frame and writes the next output packet, if
3926 * available, to avpkt. The output packet does not necessarily contain data for
3927 * the most recent frame, as encoders can delay and reorder input frames
3928 * internally as needed.
3930 * @param avctx codec context
3931 * @param avpkt output AVPacket.
3932 * The user can supply an output buffer by setting
3933 * avpkt->data and avpkt->size prior to calling the
3934 * function, but if the size of the user-provided data is not
3935 * large enough, encoding will fail. All other AVPacket fields
3936 * will be reset by the encoder using av_init_packet(). If
3937 * avpkt->data is NULL, the encoder will allocate it.
3938 * The encoder will set avpkt->size to the size of the
3939 * output packet. The returned data (if any) belongs to the
3940 * caller, he is responsible for freeing it.
3942 * If this function fails or produces no output, avpkt will be
3943 * freed using av_free_packet() (i.e. avpkt->destruct will be
3944 * called to free the user supplied buffer).
3945 * @param[in] frame AVFrame containing the raw video data to be encoded.
3946 * May be NULL when flushing an encoder that has the
3947 * CODEC_CAP_DELAY capability set.
3948 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3949 * output packet is non-empty, and to 0 if it is
3950 * empty. If the function returns an error, the
3951 * packet can be assumed to be invalid, and the
3952 * value of got_packet_ptr is undefined and should
3954 * @return 0 on success, negative error code on failure
3956 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3957 const AVFrame *frame, int *got_packet_ptr);
3959 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3960 const AVSubtitle *sub);
3968 * @defgroup lavc_resample Audio resampling
3973 struct ReSampleContext;
3974 struct AVResampleContext;
3976 typedef struct ReSampleContext ReSampleContext;
3979 * Initialize audio resampling context.
3981 * @param output_channels number of output channels
3982 * @param input_channels number of input channels
3983 * @param output_rate output sample rate
3984 * @param input_rate input sample rate
3985 * @param sample_fmt_out requested output sample format
3986 * @param sample_fmt_in input sample format
3987 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff frequency
3988 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
3989 * @param linear if 1 then the used FIR filter will be linearly interpolated
3990 between the 2 closest, if 0 the closest will be used
3991 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
3992 * @return allocated ReSampleContext, NULL if error occurred
3994 ReSampleContext *av_audio_resample_init(int output_channels, int input_channels,
3995 int output_rate, int input_rate,
3996 enum AVSampleFormat sample_fmt_out,
3997 enum AVSampleFormat sample_fmt_in,
3998 int filter_length, int log2_phase_count,
3999 int linear, double cutoff);
4001 int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
4004 * Free resample context.
4006 * @param s a non-NULL pointer to a resample context previously
4007 * created with av_audio_resample_init()
4009 void audio_resample_close(ReSampleContext *s);
4013 * Initialize an audio resampler.
4014 * Note, if either rate is not an integer then simply scale both rates up so they are.
4015 * @param filter_length length of each FIR filter in the filterbank relative to the cutoff freq
4016 * @param log2_phase_count log2 of the number of entries in the polyphase filterbank
4017 * @param linear If 1 then the used FIR filter will be linearly interpolated
4018 between the 2 closest, if 0 the closest will be used
4019 * @param cutoff cutoff frequency, 1.0 corresponds to half the output sampling rate
4021 struct AVResampleContext *av_resample_init(int out_rate, int in_rate, int filter_length, int log2_phase_count, int linear, double cutoff);
4024 * Resample an array of samples using a previously configured context.
4025 * @param src an array of unconsumed samples
4026 * @param consumed the number of samples of src which have been consumed are returned here
4027 * @param src_size the number of unconsumed samples available
4028 * @param dst_size the amount of space in samples available in dst
4029 * @param update_ctx If this is 0 then the context will not be modified, that way several channels can be resampled with the same context.
4030 * @return the number of samples written in dst or -1 if an error occurred
4032 int av_resample(struct AVResampleContext *c, short *dst, short *src, int *consumed, int src_size, int dst_size, int update_ctx);
4036 * Compensate samplerate/timestamp drift. The compensation is done by changing
4037 * the resampler parameters, so no audible clicks or similar distortions occur
4038 * @param compensation_distance distance in output samples over which the compensation should be performed
4039 * @param sample_delta number of output samples which should be output less
4041 * example: av_resample_compensate(c, 10, 500)
4042 * here instead of 510 samples only 500 samples would be output
4044 * note, due to rounding the actual compensation might be slightly different,
4045 * especially if the compensation_distance is large and the in_rate used during init is small
4047 void av_resample_compensate(struct AVResampleContext *c, int sample_delta, int compensation_distance);
4048 void av_resample_close(struct AVResampleContext *c);
4055 * @addtogroup lavc_picture
4060 * Allocate memory for a picture. Call avpicture_free() to free it.
4062 * @see avpicture_fill()
4064 * @param picture the picture to be filled in
4065 * @param pix_fmt the format of the picture
4066 * @param width the width of the picture
4067 * @param height the height of the picture
4068 * @return zero if successful, a negative value if not
4070 int avpicture_alloc(AVPicture *picture, enum PixelFormat pix_fmt, int width, int height);
4073 * Free a picture previously allocated by avpicture_alloc().
4074 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4077 * @param picture the AVPicture to be freed
4079 void avpicture_free(AVPicture *picture);
4082 * Fill in the AVPicture fields.
4083 * The fields of the given AVPicture are filled in by using the 'ptr' address
4084 * which points to the image data buffer. Depending on the specified picture
4085 * format, one or multiple image data pointers and line sizes will be set.
4086 * If a planar format is specified, several pointers will be set pointing to
4087 * the different picture planes and the line sizes of the different planes
4088 * will be stored in the lines_sizes array.
4089 * Call with ptr == NULL to get the required size for the ptr buffer.
4091 * To allocate the buffer and fill in the AVPicture fields in one call,
4092 * use avpicture_alloc().
4094 * @param picture AVPicture whose fields are to be filled in
4095 * @param ptr Buffer which will contain or contains the actual image data
4096 * @param pix_fmt The format in which the picture data is stored.
4097 * @param width the width of the image in pixels
4098 * @param height the height of the image in pixels
4099 * @return size of the image data in bytes
4101 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4102 enum PixelFormat pix_fmt, int width, int height);
4105 * Copy pixel data from an AVPicture into a buffer.
4106 * The data is stored compactly, without any gaps for alignment or padding
4107 * which may be applied by avpicture_fill().
4109 * @see avpicture_get_size()
4111 * @param[in] src AVPicture containing image data
4112 * @param[in] pix_fmt The format in which the picture data is stored.
4113 * @param[in] width the width of the image in pixels.
4114 * @param[in] height the height of the image in pixels.
4115 * @param[out] dest A buffer into which picture data will be copied.
4116 * @param[in] dest_size The size of 'dest'.
4117 * @return The number of bytes written to dest, or a negative value (error code) on error.
4119 int avpicture_layout(const AVPicture* src, enum PixelFormat pix_fmt, int width, int height,
4120 unsigned char *dest, int dest_size);
4123 * Calculate the size in bytes that a picture of the given width and height
4124 * would occupy if stored in the given picture format.
4125 * Note that this returns the size of a compact representation as generated
4126 * by avpicture_layout(), which can be smaller than the size required for e.g.
4129 * @param pix_fmt the given picture format
4130 * @param width the width of the image
4131 * @param height the height of the image
4132 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
4134 int avpicture_get_size(enum PixelFormat pix_fmt, int width, int height);
4137 * deinterlace - if not supported return -1
4139 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4140 enum PixelFormat pix_fmt, int width, int height);
4142 * Copy image src to dst. Wraps av_picture_data_copy() above.
4144 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4145 enum PixelFormat pix_fmt, int width, int height);
4148 * Crop image top and left side.
4150 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4151 enum PixelFormat pix_fmt, int top_band, int left_band);
4156 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum PixelFormat pix_fmt,
4157 int padtop, int padbottom, int padleft, int padright, int *color);
4164 * @defgroup lavc_misc Utility functions
4167 * Miscellaneous utility functions related to both encoding and decoding
4173 * @defgroup lavc_misc_pixfmt Pixel formats
4175 * Functions for working with pixel formats.
4179 void avcodec_get_chroma_sub_sample(enum PixelFormat pix_fmt, int *h_shift, int *v_shift);
4182 * Return a value representing the fourCC code associated to the
4183 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4186 unsigned int avcodec_pix_fmt_to_codec_tag(enum PixelFormat pix_fmt);
4188 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4189 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4190 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4191 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4192 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4193 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4196 * Compute what kind of losses will occur when converting from one specific
4197 * pixel format to another.
4198 * When converting from one pixel format to another, information loss may occur.
4199 * For example, when converting from RGB24 to GRAY, the color information will
4200 * be lost. Similarly, other losses occur when converting from some formats to
4201 * other formats. These losses can involve loss of chroma, but also loss of
4202 * resolution, loss of color depth, loss due to the color space conversion, loss
4203 * of the alpha bits or loss due to color quantization.
4204 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4205 * which will occur when converting from one pixel format to another.
4207 * @param[in] dst_pix_fmt destination pixel format
4208 * @param[in] src_pix_fmt source pixel format
4209 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4210 * @return Combination of flags informing you what kind of losses will occur.
4212 int avcodec_get_pix_fmt_loss(enum PixelFormat dst_pix_fmt, enum PixelFormat src_pix_fmt,
4215 #if FF_API_FIND_BEST_PIX_FMT
4217 * @deprecated use avcodec_find_best_pix_fmt2() instead.
4219 * Find the best pixel format to convert to given a certain source pixel
4220 * format. When converting from one pixel format to another, information loss
4221 * may occur. For example, when converting from RGB24 to GRAY, the color
4222 * information will be lost. Similarly, other losses occur when converting from
4223 * some formats to other formats. avcodec_find_best_pix_fmt() searches which of
4224 * the given pixel formats should be used to suffer the least amount of loss.
4225 * The pixel formats from which it chooses one, are determined by the
4226 * pix_fmt_mask parameter.
4229 * src_pix_fmt = PIX_FMT_YUV420P;
4230 * pix_fmt_mask = (1 << PIX_FMT_YUV422P) || (1 << PIX_FMT_RGB24);
4231 * dst_pix_fmt = avcodec_find_best_pix_fmt(pix_fmt_mask, src_pix_fmt, alpha, &loss);
4234 * @param[in] pix_fmt_mask bitmask determining which pixel format to choose from
4235 * @param[in] src_pix_fmt source pixel format
4236 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4237 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4238 * @return The best pixel format to convert to or -1 if none was found.
4240 attribute_deprecated
4241 enum PixelFormat avcodec_find_best_pix_fmt(int64_t pix_fmt_mask, enum PixelFormat src_pix_fmt,
4242 int has_alpha, int *loss_ptr);
4243 #endif /* FF_API_FIND_BEST_PIX_FMT */
4246 * Find the best pixel format to convert to given a certain source pixel
4247 * format. When converting from one pixel format to another, information loss
4248 * may occur. For example, when converting from RGB24 to GRAY, the color
4249 * information will be lost. Similarly, other losses occur when converting from
4250 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4251 * the given pixel formats should be used to suffer the least amount of loss.
4252 * The pixel formats from which it chooses one, are determined by the
4253 * pix_fmt_list parameter.
4256 * @param[in] pix_fmt_list PIX_FMT_NONE terminated array of pixel formats to choose from
4257 * @param[in] src_pix_fmt source pixel format
4258 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4259 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4260 * @return The best pixel format to convert to or -1 if none was found.
4262 enum PixelFormat avcodec_find_best_pix_fmt2(enum PixelFormat *pix_fmt_list,
4263 enum PixelFormat src_pix_fmt,
4264 int has_alpha, int *loss_ptr);
4266 enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat * fmt);
4272 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4275 * Put a string representing the codec tag codec_tag in buf.
4277 * @param buf_size size in bytes of buf
4278 * @return the length of the string that would have been generated if
4279 * enough space had been available, excluding the trailing null
4281 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4283 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4286 * Return a name for the specified profile, if available.
4288 * @param codec the codec that is searched for the given profile
4289 * @param profile the profile value for which a name is requested
4290 * @return A name for the profile if found, NULL otherwise.
4292 const char *av_get_profile_name(const AVCodec *codec, int profile);
4294 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4295 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4296 //FIXME func typedef
4299 * Fill audio frame data and linesize.
4300 * AVFrame extended_data channel pointers are allocated if necessary for
4303 * @param frame the AVFrame
4304 * frame->nb_samples must be set prior to calling the
4305 * function. This function fills in frame->data,
4306 * frame->extended_data, frame->linesize[0].
4307 * @param nb_channels channel count
4308 * @param sample_fmt sample format
4309 * @param buf buffer to use for frame data
4310 * @param buf_size size of buffer
4311 * @param align plane size sample alignment (0 = default)
4312 * @return 0 on success, negative error code on failure
4314 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4315 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4316 int buf_size, int align);
4319 * Flush buffers, should be called when seeking or when switching to a different stream.
4321 void avcodec_flush_buffers(AVCodecContext *avctx);
4323 void avcodec_default_free_buffers(AVCodecContext *s);
4326 * Return codec bits per sample.
4328 * @param[in] codec_id the codec
4329 * @return Number of bits per sample or zero if unknown for the given codec.
4331 int av_get_bits_per_sample(enum AVCodecID codec_id);
4334 * Return codec bits per sample.
4335 * Only return non-zero if the bits per sample is exactly correct, not an
4338 * @param[in] codec_id the codec
4339 * @return Number of bits per sample or zero if unknown for the given codec.
4341 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4344 * Return audio frame duration.
4346 * @param avctx codec context
4347 * @param frame_bytes size of the frame, or 0 if unknown
4348 * @return frame duration, in samples, if known. 0 if not able to
4351 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4354 typedef struct AVBitStreamFilterContext {
4356 struct AVBitStreamFilter *filter;
4357 AVCodecParserContext *parser;
4358 struct AVBitStreamFilterContext *next;
4359 } AVBitStreamFilterContext;
4362 typedef struct AVBitStreamFilter {
4365 int (*filter)(AVBitStreamFilterContext *bsfc,
4366 AVCodecContext *avctx, const char *args,
4367 uint8_t **poutbuf, int *poutbuf_size,
4368 const uint8_t *buf, int buf_size, int keyframe);
4369 void (*close)(AVBitStreamFilterContext *bsfc);
4370 struct AVBitStreamFilter *next;
4371 } AVBitStreamFilter;
4373 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4374 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4375 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4376 AVCodecContext *avctx, const char *args,
4377 uint8_t **poutbuf, int *poutbuf_size,
4378 const uint8_t *buf, int buf_size, int keyframe);
4379 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4381 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4386 * Reallocate the given block if it is not large enough, otherwise do nothing.
4390 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4393 * Allocate a buffer, reusing the given one if large enough.
4395 * Contrary to av_fast_realloc the current buffer contents might not be
4396 * preserved and on error the old buffer is freed, thus no special
4397 * handling to avoid memleaks is necessary.
4399 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4400 * @param size size of the buffer *ptr points to
4401 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4402 * *size 0 if an error occurred.
4404 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4407 * Allocate a buffer with padding, reusing the given one if large enough.
4409 * Same behaviour av_fast_malloc but the buffer has additional
4410 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4413 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4416 * Encode extradata length to a buffer. Used by xiph codecs.
4418 * @param s buffer to write to; must be at least (v/255+1) bytes long
4419 * @param v size of extradata in bytes
4420 * @return number of bytes written to the buffer.
4422 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4425 * Log a generic warning message about a missing feature. This function is
4426 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4427 * only, and would normally not be used by applications.
4428 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4429 * a pointer to an AVClass struct
4430 * @param[in] feature string containing the name of the missing feature
4431 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4432 * If want_sample is non-zero, additional verbage will be added to the log
4433 * message which tells the user how to report samples to the development
4436 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4439 * Log a generic warning message asking for a sample. This function is
4440 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4441 * only, and would normally not be used by applications.
4442 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4443 * a pointer to an AVClass struct
4444 * @param[in] msg string containing an optional message, or NULL if no message
4446 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4449 * Register the hardware accelerator hwaccel.
4451 void av_register_hwaccel(AVHWAccel *hwaccel);
4454 * If hwaccel is NULL, returns the first registered hardware accelerator,
4455 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4456 * after hwaccel, or NULL if hwaccel is the last one.
4458 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4462 * Lock operation used by lockmgr
4465 AV_LOCK_CREATE, ///< Create a mutex
4466 AV_LOCK_OBTAIN, ///< Lock the mutex
4467 AV_LOCK_RELEASE, ///< Unlock the mutex
4468 AV_LOCK_DESTROY, ///< Free mutex resources
4472 * Register a user provided lock manager supporting the operations
4473 * specified by AVLockOp. mutex points to a (void *) where the
4474 * lockmgr should store/get a pointer to a user allocated mutex. It's
4475 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4477 * @param cb User defined callback. Note: Libav may invoke calls to this
4478 * callback during the call to av_lockmgr_register().
4479 * Thus, the application must be prepared to handle that.
4480 * If cb is set to NULL the lockmgr will be unregistered.
4481 * Also note that during unregistration the previously registered
4482 * lockmgr callback may also be invoked.
4484 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4487 * Get the type of the given codec.
4489 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4492 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4493 * with no corresponding avcodec_close()), 0 otherwise.
4495 int avcodec_is_open(AVCodecContext *s);
4498 * @return a non-zero number if codec is an encoder, zero otherwise
4500 int av_codec_is_encoder(AVCodec *codec);
4503 * @return a non-zero number if codec is a decoder, zero otherwise
4505 int av_codec_is_decoder(AVCodec *codec);
4511 #endif /* AVCODEC_AVCODEC_H */