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/buffer.h"
33 #include "libavutil/cpu.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/frame.h"
36 #include "libavutil/log.h"
37 #include "libavutil/pixfmt.h"
38 #include "libavutil/rational.h"
40 #include "libavcodec/version.h"
42 * @defgroup libavc Encoding/Decoding Library
45 * @defgroup lavc_decoding Decoding
49 * @defgroup lavc_encoding Encoding
53 * @defgroup lavc_codec Codecs
55 * @defgroup lavc_codec_native Native Codecs
58 * @defgroup lavc_codec_wrappers External library wrappers
61 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
65 * @defgroup lavc_internal Internal
73 * @defgroup lavc_core Core functions/structures.
76 * Basic definitions, functions for querying libavcodec capabilities,
77 * allocating core structures, etc.
83 * Identify the syntax and semantics of the bitstream.
84 * The principle is roughly:
85 * Two decoders with the same ID can decode the same streams.
86 * Two encoders with the same ID can encode compatible streams.
87 * There may be slight deviations from the principle due to implementation
90 * If you add a codec ID to this list, add it so that
91 * 1. no value of a existing codec ID changes (that would break ABI),
92 * 2. it is as close as possible to similar codecs.
94 * After adding new codec IDs, do not forget to add an entry to the codec
95 * descriptor list and bump libavcodec minor version.
101 AV_CODEC_ID_MPEG1VIDEO,
102 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
103 AV_CODEC_ID_MPEG2VIDEO_XVMC,
114 AV_CODEC_ID_RAWVIDEO,
115 AV_CODEC_ID_MSMPEG4V1,
116 AV_CODEC_ID_MSMPEG4V2,
117 AV_CODEC_ID_MSMPEG4V3,
140 AV_CODEC_ID_INTERPLAY_VIDEO,
147 AV_CODEC_ID_MSVIDEO1,
152 AV_CODEC_ID_TRUEMOTION1,
153 AV_CODEC_ID_VMDVIDEO,
178 AV_CODEC_ID_TRUEMOTION2,
184 AV_CODEC_ID_SMACKVIDEO,
189 AV_CODEC_ID_JPEG2000,
195 AV_CODEC_ID_DSICINVIDEO,
196 AV_CODEC_ID_TIERTEXSEQVIDEO,
204 AV_CODEC_ID_BETHSOFTVID,
216 AV_CODEC_ID_ESCAPE124,
220 AV_CODEC_ID_MOTIONPIXELS,
232 AV_CODEC_ID_FLASHSV2,
233 AV_CODEC_ID_CDGRAPHICS,
236 AV_CODEC_ID_BINKVIDEO,
237 AV_CODEC_ID_IFF_ILBM,
238 AV_CODEC_ID_IFF_BYTERUN1,
244 AV_CODEC_ID_A64_MULTI,
245 AV_CODEC_ID_A64_MULTI5,
248 AV_CODEC_ID_LAGARITH,
252 AV_CODEC_ID_WMV3IMAGE,
253 AV_CODEC_ID_VC1IMAGE,
255 AV_CODEC_ID_BMV_VIDEO,
262 AV_CODEC_ID_ZEROCODEC,
271 /* various PCM "codecs" */
272 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
273 AV_CODEC_ID_PCM_S16LE = 0x10000,
274 AV_CODEC_ID_PCM_S16BE,
275 AV_CODEC_ID_PCM_U16LE,
276 AV_CODEC_ID_PCM_U16BE,
279 AV_CODEC_ID_PCM_MULAW,
280 AV_CODEC_ID_PCM_ALAW,
281 AV_CODEC_ID_PCM_S32LE,
282 AV_CODEC_ID_PCM_S32BE,
283 AV_CODEC_ID_PCM_U32LE,
284 AV_CODEC_ID_PCM_U32BE,
285 AV_CODEC_ID_PCM_S24LE,
286 AV_CODEC_ID_PCM_S24BE,
287 AV_CODEC_ID_PCM_U24LE,
288 AV_CODEC_ID_PCM_U24BE,
289 AV_CODEC_ID_PCM_S24DAUD,
290 AV_CODEC_ID_PCM_ZORK,
291 AV_CODEC_ID_PCM_S16LE_PLANAR,
293 AV_CODEC_ID_PCM_F32BE,
294 AV_CODEC_ID_PCM_F32LE,
295 AV_CODEC_ID_PCM_F64BE,
296 AV_CODEC_ID_PCM_F64LE,
297 AV_CODEC_ID_PCM_BLURAY,
300 AV_CODEC_ID_PCM_S8_PLANAR,
302 /* various ADPCM codecs */
303 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
304 AV_CODEC_ID_ADPCM_IMA_WAV,
305 AV_CODEC_ID_ADPCM_IMA_DK3,
306 AV_CODEC_ID_ADPCM_IMA_DK4,
307 AV_CODEC_ID_ADPCM_IMA_WS,
308 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
309 AV_CODEC_ID_ADPCM_MS,
310 AV_CODEC_ID_ADPCM_4XM,
311 AV_CODEC_ID_ADPCM_XA,
312 AV_CODEC_ID_ADPCM_ADX,
313 AV_CODEC_ID_ADPCM_EA,
314 AV_CODEC_ID_ADPCM_G726,
315 AV_CODEC_ID_ADPCM_CT,
316 AV_CODEC_ID_ADPCM_SWF,
317 AV_CODEC_ID_ADPCM_YAMAHA,
318 AV_CODEC_ID_ADPCM_SBPRO_4,
319 AV_CODEC_ID_ADPCM_SBPRO_3,
320 AV_CODEC_ID_ADPCM_SBPRO_2,
321 AV_CODEC_ID_ADPCM_THP,
322 AV_CODEC_ID_ADPCM_IMA_AMV,
323 AV_CODEC_ID_ADPCM_EA_R1,
324 AV_CODEC_ID_ADPCM_EA_R3,
325 AV_CODEC_ID_ADPCM_EA_R2,
326 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
327 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
328 AV_CODEC_ID_ADPCM_EA_XAS,
329 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
330 AV_CODEC_ID_ADPCM_IMA_ISS,
331 AV_CODEC_ID_ADPCM_G722,
332 AV_CODEC_ID_ADPCM_IMA_APC,
335 AV_CODEC_ID_AMR_NB = 0x12000,
338 /* RealAudio codecs*/
339 AV_CODEC_ID_RA_144 = 0x13000,
342 /* various DPCM codecs */
343 AV_CODEC_ID_ROQ_DPCM = 0x14000,
344 AV_CODEC_ID_INTERPLAY_DPCM,
345 AV_CODEC_ID_XAN_DPCM,
346 AV_CODEC_ID_SOL_DPCM,
349 AV_CODEC_ID_MP2 = 0x15000,
350 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
360 AV_CODEC_ID_VMDAUDIO,
366 AV_CODEC_ID_WESTWOOD_SND1,
367 AV_CODEC_ID_GSM, ///< as in Berlin toast format
370 AV_CODEC_ID_TRUESPEECH,
372 AV_CODEC_ID_SMACKAUDIO,
375 AV_CODEC_ID_DSICINAUDIO,
377 AV_CODEC_ID_MUSEPACK7,
379 AV_CODEC_ID_GSM_MS, /* as found in WAV */
383 AV_CODEC_ID_NELLYMOSER,
384 AV_CODEC_ID_MUSEPACK8,
386 AV_CODEC_ID_WMAVOICE,
388 AV_CODEC_ID_WMALOSSLESS,
397 AV_CODEC_ID_BINKAUDIO_RDFT,
398 AV_CODEC_ID_BINKAUDIO_DCT,
399 AV_CODEC_ID_AAC_LATM,
404 AV_CODEC_ID_8SVX_EXP,
405 AV_CODEC_ID_8SVX_FIB,
406 AV_CODEC_ID_BMV_AUDIO,
411 AV_CODEC_ID_COMFORT_NOISE,
414 /* subtitle codecs */
415 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
416 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
417 AV_CODEC_ID_DVB_SUBTITLE,
418 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
421 AV_CODEC_ID_MOV_TEXT,
422 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
423 AV_CODEC_ID_DVB_TELETEXT,
426 /* other specific kind of codecs (generally used for attachments) */
427 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
428 AV_CODEC_ID_TTF = 0x18000,
430 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
432 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
433 * stream (only used by libavformat) */
434 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
435 * stream (only used by libavformat) */
436 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
440 * This struct describes the properties of a single codec described by an
442 * @see avcodec_get_descriptor()
444 typedef struct AVCodecDescriptor {
446 enum AVMediaType type;
448 * Name of the codec described by this descriptor. It is non-empty and
449 * unique for each codec descriptor. It should contain alphanumeric
450 * characters and '_' only.
454 * A more descriptive name for this codec. May be NULL.
456 const char *long_name;
458 * Codec properties, a combination of AV_CODEC_PROP_* flags.
464 * Codec uses only intra compression.
467 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
469 * Codec supports lossy compression. Audio and video codecs only.
470 * @note a codec may support both lossy and lossless
473 #define AV_CODEC_PROP_LOSSY (1 << 1)
475 * Codec supports lossless compression. Audio and video codecs only.
477 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
480 * @ingroup lavc_decoding
481 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
482 * This is mainly needed because some optimized bitstream readers read
483 * 32 or 64 bit at once and could read over the end.<br>
484 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
485 * MPEG bitstreams could cause overread and segfault.
487 #define FF_INPUT_BUFFER_PADDING_SIZE 8
490 * @ingroup lavc_encoding
491 * minimum encoding buffer size
492 * Used to avoid some checks during header writing.
494 #define FF_MIN_BUFFER_SIZE 16384
498 * @ingroup lavc_encoding
499 * motion estimation type.
502 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
506 ME_EPZS, ///< enhanced predictive zonal search
507 ME_X1, ///< reserved for experiments
508 ME_HEX, ///< hexagon based search
509 ME_UMH, ///< uneven multi-hexagon search
510 ME_TESA, ///< transformed exhaustive search algorithm
514 * @ingroup lavc_decoding
517 /* We leave some space between them for extensions (drop some
518 * keyframes for intra-only or drop just some bidir frames). */
519 AVDISCARD_NONE =-16, ///< discard nothing
520 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
521 AVDISCARD_NONREF = 8, ///< discard all non reference
522 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
523 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
524 AVDISCARD_ALL = 48, ///< discard all
527 enum AVColorPrimaries{
528 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
529 AVCOL_PRI_UNSPECIFIED = 2,
530 AVCOL_PRI_BT470M = 4,
531 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
532 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
533 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
535 AVCOL_PRI_NB , ///< Not part of ABI
538 enum AVColorTransferCharacteristic{
539 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
540 AVCOL_TRC_UNSPECIFIED = 2,
541 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
542 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
543 AVCOL_TRC_SMPTE240M = 7,
544 AVCOL_TRC_NB , ///< Not part of ABI
549 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
550 AVCOL_SPC_UNSPECIFIED = 2,
552 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
553 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
554 AVCOL_SPC_SMPTE240M = 7,
555 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
556 AVCOL_SPC_NB , ///< Not part of ABI
560 AVCOL_RANGE_UNSPECIFIED = 0,
561 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
562 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
563 AVCOL_RANGE_NB , ///< Not part of ABI
567 * X X 3 4 X X are luma samples,
568 * 1 2 1-6 are possible chroma positions
569 * X X 5 6 X 0 is undefined/unknown position
571 enum AVChromaLocation{
572 AVCHROMA_LOC_UNSPECIFIED = 0,
573 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
574 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
575 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
576 AVCHROMA_LOC_TOP = 4,
577 AVCHROMA_LOC_BOTTOMLEFT = 5,
578 AVCHROMA_LOC_BOTTOM = 6,
579 AVCHROMA_LOC_NB , ///< Not part of ABI
582 enum AVAudioServiceType {
583 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
584 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
585 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
586 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
587 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
588 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
589 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
590 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
591 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
592 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
596 * @ingroup lavc_encoding
598 typedef struct RcOverride{
601 int qscale; // If this is 0 then quality_factor will be used instead.
602 float quality_factor;
605 #define FF_MAX_B_FRAMES 16
608 These flags can be passed in AVCodecContext.flags before initialization.
609 Note: Not everything is supported yet.
612 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
613 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
614 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
615 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
616 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
618 * The parent program guarantees that the input for B-frames containing
619 * streams is not written to for at least s->max_b_frames+1 frames, if
620 * this is not set the input will be copied.
622 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
623 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
624 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
625 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
626 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
627 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
628 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
629 location instead of only at frame boundaries. */
630 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
631 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
632 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
633 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
634 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
635 /* Fx : Flag for h263+ extra options */
636 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
637 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
638 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
639 #define CODEC_FLAG_CLOSED_GOP 0x80000000
640 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
641 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
642 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
643 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
645 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
647 /* Unsupported options :
648 * Syntax Arithmetic coding (SAC)
649 * Reference Picture Selection
650 * Independent Segment Decoding */
652 /* codec capabilities */
654 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
656 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
657 * If not set, it might not use get_buffer() at all or use operations that
658 * assume the buffer was allocated by avcodec_default_get_buffer.
660 #define CODEC_CAP_DR1 0x0002
661 #define CODEC_CAP_TRUNCATED 0x0008
662 /* Codec can export data for HW decoding (XvMC). */
663 #define CODEC_CAP_HWACCEL 0x0010
665 * Encoder or decoder requires flushing with NULL input at the end in order to
666 * give the complete and correct output.
668 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
669 * with NULL data. The user can still send NULL data to the public encode
670 * or decode function, but libavcodec will not pass it along to the codec
671 * unless this flag is set.
674 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
675 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
679 * The encoder needs to be fed with NULL data at the end of encoding until the
680 * encoder no longer returns data.
682 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
683 * flag also means that the encoder must set the pts and duration for
684 * each output packet. If this flag is not set, the pts and duration will
685 * be determined by libavcodec from the input frame.
687 #define CODEC_CAP_DELAY 0x0020
689 * Codec can be fed a final frame with a smaller size.
690 * This can be used to prevent truncation of the last audio samples.
692 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
694 * Codec can export data for HW decoding (VDPAU).
696 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
698 * Codec can output multiple frames per AVPacket
699 * Normally demuxers return one frame at a time, demuxers which do not do
700 * are connected to a parser to split what they return into proper frames.
701 * This flag is reserved to the very rare category of codecs which have a
702 * bitstream that cannot be split into frames without timeconsuming
703 * operations like full decoding. Demuxers carring such bitstreams thus
704 * may return multiple frames in a packet. This has many disadvantages like
705 * prohibiting stream copy in many cases thus it should only be considered
708 #define CODEC_CAP_SUBFRAMES 0x0100
710 * Codec is experimental and is thus avoided in favor of non experimental
713 #define CODEC_CAP_EXPERIMENTAL 0x0200
715 * Codec should fill in channel configuration and samplerate instead of container
717 #define CODEC_CAP_CHANNEL_CONF 0x0400
719 * Codec is able to deal with negative linesizes
721 #define CODEC_CAP_NEG_LINESIZES 0x0800
723 * Codec supports frame-level multithreading.
725 #define CODEC_CAP_FRAME_THREADS 0x1000
727 * Codec supports slice-based (or partition-based) multithreading.
729 #define CODEC_CAP_SLICE_THREADS 0x2000
731 * Codec supports changed parameters at any point.
733 #define CODEC_CAP_PARAM_CHANGE 0x4000
735 * Codec supports avctx->thread_count == 0 (auto).
737 #define CODEC_CAP_AUTO_THREADS 0x8000
739 * Audio encoder supports receiving a different number of samples in each call.
741 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
743 //The following defines may change, don't expect compatibility if you use them.
744 #define MB_TYPE_INTRA4x4 0x0001
745 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
746 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
747 #define MB_TYPE_16x16 0x0008
748 #define MB_TYPE_16x8 0x0010
749 #define MB_TYPE_8x16 0x0020
750 #define MB_TYPE_8x8 0x0040
751 #define MB_TYPE_INTERLACED 0x0080
752 #define MB_TYPE_DIRECT2 0x0100 //FIXME
753 #define MB_TYPE_ACPRED 0x0200
754 #define MB_TYPE_GMC 0x0400
755 #define MB_TYPE_SKIP 0x0800
756 #define MB_TYPE_P0L0 0x1000
757 #define MB_TYPE_P1L0 0x2000
758 #define MB_TYPE_P0L1 0x4000
759 #define MB_TYPE_P1L1 0x8000
760 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
761 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
762 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
763 #define MB_TYPE_QUANT 0x00010000
764 #define MB_TYPE_CBP 0x00020000
765 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
769 * This specifies the area which should be displayed.
770 * Note there may be multiple such areas for one frame.
772 typedef struct AVPanScan{
775 * - encoding: Set by user.
776 * - decoding: Set by libavcodec.
781 * width and height in 1/16 pel
782 * - encoding: Set by user.
783 * - decoding: Set by libavcodec.
789 * position of the top left corner in 1/16 pel for up to 3 fields/frames
790 * - encoding: Set by user.
791 * - decoding: Set by libavcodec.
793 int16_t position[3][2];
796 #define FF_QSCALE_TYPE_MPEG1 0
797 #define FF_QSCALE_TYPE_MPEG2 1
798 #define FF_QSCALE_TYPE_H264 2
799 #define FF_QSCALE_TYPE_VP56 3
801 #if FF_API_GET_BUFFER
802 #define FF_BUFFER_TYPE_INTERNAL 1
803 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
804 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
805 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
807 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
808 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
809 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
810 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
814 * The decoder will keep a reference to the frame and may reuse it later.
816 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
819 * @defgroup lavc_packet AVPacket
821 * Types and functions for working with AVPacket.
824 enum AVPacketSideDataType {
826 AV_PKT_DATA_NEW_EXTRADATA,
829 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
832 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
833 * s32le channel_count
834 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
835 * u64le channel_layout
836 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
838 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
843 AV_PKT_DATA_PARAM_CHANGE,
846 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
847 * structures with info about macroblocks relevant to splitting the
848 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
849 * That is, it does not necessarily contain info about all macroblocks,
850 * as long as the distance between macroblocks in the info is smaller
851 * than the target payload size.
852 * Each MB info structure is 12 bytes, and is laid out as follows:
854 * u32le bit offset from the start of the packet
855 * u8 current quantizer at the start of the macroblock
857 * u16le macroblock address within the GOB
858 * u8 horizontal MV predictor
859 * u8 vertical MV predictor
860 * u8 horizontal MV predictor for block number 3
861 * u8 vertical MV predictor for block number 3
864 AV_PKT_DATA_H263_MB_INFO,
868 * This structure stores compressed data. It is typically exported by demuxers
869 * and then passed as input to decoders, or received as output from encoders and
870 * then passed to muxers.
872 * For video, it should typically contain one compressed frame. For audio it may
873 * contain several compressed frames.
875 * AVPacket is one of the few structs in Libav, whose size is a part of public
876 * ABI. Thus it may be allocated on stack and no new fields can be added to it
877 * without libavcodec and libavformat major bump.
879 * The semantics of data ownership depends on the buf or destruct (deprecated)
880 * fields. If either is set, the packet data is dynamically allocated and is
881 * valid indefinitely until av_free_packet() is called (which in turn calls
882 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
883 * the packet data is typically backed by some static buffer somewhere and is
884 * only valid for a limited time (e.g. until the next read call when demuxing).
886 * The side data is always allocated with av_malloc() and is freed in
889 typedef struct AVPacket {
891 * A reference to the reference-counted buffer where the packet data is
893 * May be NULL, then the packet data is not reference-counted.
897 * Presentation timestamp in AVStream->time_base units; the time at which
898 * the decompressed packet will be presented to the user.
899 * Can be AV_NOPTS_VALUE if it is not stored in the file.
900 * pts MUST be larger or equal to dts as presentation cannot happen before
901 * decompression, unless one wants to view hex dumps. Some formats misuse
902 * the terms dts and pts/cts to mean something different. Such timestamps
903 * must be converted to true pts/dts before they are stored in AVPacket.
907 * Decompression timestamp in AVStream->time_base units; the time at which
908 * the packet is decompressed.
909 * Can be AV_NOPTS_VALUE if it is not stored in the file.
916 * A combination of AV_PKT_FLAG values
920 * Additional packet data that can be provided by the container.
921 * Packet can contain several types of side information.
926 enum AVPacketSideDataType type;
931 * Duration of this packet in AVStream->time_base units, 0 if unknown.
932 * Equals next_pts - this_pts in presentation order.
935 #if FF_API_DESTRUCT_PACKET
937 void (*destruct)(struct AVPacket *);
941 int64_t pos; ///< byte position in stream, -1 if unknown
944 * Time difference in AVStream->time_base units from the pts of this
945 * packet to the point at which the output from the decoder has converged
946 * independent from the availability of previous frames. That is, the
947 * frames are virtually identical no matter if decoding started from
948 * the very first frame or from this keyframe.
949 * Is AV_NOPTS_VALUE if unknown.
950 * This field is not the display duration of the current packet.
951 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
954 * The purpose of this field is to allow seeking in streams that have no
955 * keyframes in the conventional sense. It corresponds to the
956 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
957 * essential for some types of subtitle streams to ensure that all
958 * subtitles are correctly displayed after seeking.
960 int64_t convergence_duration;
962 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
963 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
965 enum AVSideDataParamChangeFlags {
966 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
967 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
968 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
969 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
975 struct AVCodecInternal;
979 AV_FIELD_PROGRESSIVE,
980 AV_FIELD_TT, //< Top coded_first, top displayed first
981 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
982 AV_FIELD_TB, //< Top coded first, bottom displayed first
983 AV_FIELD_BT, //< Bottom coded first, top displayed first
987 * main external API structure.
988 * New fields can be added to the end with minor version bumps.
989 * Removal, reordering and changes to existing fields require a major
991 * sizeof(AVCodecContext) must not be used outside libav*.
993 typedef struct AVCodecContext {
995 * information on struct for av_log
996 * - set by avcodec_alloc_context3
998 const AVClass *av_class;
999 int log_level_offset;
1001 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1002 const struct AVCodec *codec;
1003 char codec_name[32];
1004 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1007 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1008 * This is used to work around some encoder bugs.
1009 * A demuxer should set this to what is stored in the field used to identify the codec.
1010 * If there are multiple such fields in a container then the demuxer should choose the one
1011 * which maximizes the information about the used codec.
1012 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1013 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1014 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1016 * - encoding: Set by user, if not then the default based on codec_id will be used.
1017 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1019 unsigned int codec_tag;
1022 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1023 * This is used to work around some encoder bugs.
1024 * - encoding: unused
1025 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1027 unsigned int stream_codec_tag;
1032 * Private context used for internal data.
1034 * Unlike priv_data, this is not codec-specific. It is used in general
1035 * libavcodec functions.
1037 struct AVCodecInternal *internal;
1040 * Private data of the user, can be used to carry app specific stuff.
1041 * - encoding: Set by user.
1042 * - decoding: Set by user.
1047 * the average bitrate
1048 * - encoding: Set by user; unused for constant quantizer encoding.
1049 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1054 * number of bits the bitstream is allowed to diverge from the reference.
1055 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1056 * - encoding: Set by user; unused for constant quantizer encoding.
1057 * - decoding: unused
1059 int bit_rate_tolerance;
1062 * Global quality for codecs which cannot change it per frame.
1063 * This should be proportional to MPEG-1/2/4 qscale.
1064 * - encoding: Set by user.
1065 * - decoding: unused
1070 * - encoding: Set by user.
1071 * - decoding: unused
1073 int compression_level;
1074 #define FF_COMPRESSION_DEFAULT -1
1078 * - encoding: Set by user.
1079 * - decoding: Set by user.
1085 * - encoding: Set by user.
1086 * - decoding: Set by user.
1091 * some codecs need / can use extradata like Huffman tables.
1092 * mjpeg: Huffman tables
1093 * rv10: additional flags
1094 * mpeg4: global headers (they can be in the bitstream or here)
1095 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1096 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1097 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1098 * - encoding: Set/allocated/freed by libavcodec.
1099 * - decoding: Set/allocated/freed by user.
1105 * This is the fundamental unit of time (in seconds) in terms
1106 * of which frame timestamps are represented. For fixed-fps content,
1107 * timebase should be 1/framerate and timestamp increments should be
1109 * - encoding: MUST be set by user.
1110 * - decoding: Set by libavcodec.
1112 AVRational time_base;
1115 * For some codecs, the time base is closer to the field rate than the frame rate.
1116 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1117 * if no telecine is used ...
1119 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1121 int ticks_per_frame;
1127 * Number of frames the decoded output will be delayed relative to the
1131 * For encoding, this is the number of "priming" samples added to the
1132 * beginning of the stream. The decoded output will be delayed by this
1133 * many samples relative to the input to the encoder. Note that this
1134 * field is purely informational and does not directly affect the pts
1135 * output by the encoder, which should always be based on the actual
1136 * presentation time, including any delay.
1137 * For decoding, this is the number of samples the decoder needs to
1138 * output before the decoder's output is valid. When seeking, you should
1139 * start decoding this many samples prior to your desired seek point.
1141 * - encoding: Set by libavcodec.
1142 * - decoding: Set by libavcodec.
1149 * picture width / height.
1150 * - encoding: MUST be set by user.
1151 * - decoding: Set by libavcodec.
1152 * Note: For compatibility it is possible to set this instead of
1153 * coded_width/height before decoding.
1158 * Bitstream width / height, may be different from width/height.
1159 * - encoding: unused
1160 * - decoding: Set by user before init if known. Codec should override / dynamically change if needed.
1162 int coded_width, coded_height;
1164 #define FF_ASPECT_EXTENDED 15
1167 * the number of pictures in a group of pictures, or 0 for intra_only
1168 * - encoding: Set by user.
1169 * - decoding: unused
1174 * Pixel format, see AV_PIX_FMT_xxx.
1175 * May be set by the demuxer if known from headers.
1176 * May be overriden by the decoder if it knows better.
1177 * - encoding: Set by user.
1178 * - decoding: Set by user if known, overridden by libavcodec if known
1180 enum AVPixelFormat pix_fmt;
1183 * Motion estimation algorithm used for video coding.
1184 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1185 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1186 * - encoding: MUST be set by user.
1187 * - decoding: unused
1192 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1193 * decoder to draw a horizontal band. It improves cache usage. Not
1194 * all codecs can do that. You must check the codec capabilities
1196 * When multithreading is used, it may be called from multiple threads
1197 * at the same time; threads might draw different parts of the same AVFrame,
1198 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1200 * The function is also used by hardware acceleration APIs.
1201 * It is called at least once during frame decoding to pass
1202 * the data needed for hardware render.
1203 * In that mode instead of pixel data, AVFrame points to
1204 * a structure specific to the acceleration API. The application
1205 * reads the structure and can change some fields to indicate progress
1207 * - encoding: unused
1208 * - decoding: Set by user.
1209 * @param height the height of the slice
1210 * @param y the y position of the slice
1211 * @param type 1->top field, 2->bottom field, 3->frame
1212 * @param offset offset into the AVFrame.data from which the slice should be read
1214 void (*draw_horiz_band)(struct AVCodecContext *s,
1215 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1216 int y, int type, int height);
1219 * callback to negotiate the pixelFormat
1220 * @param fmt is the list of formats which are supported by the codec,
1221 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1222 * The first is always the native one.
1223 * @return the chosen format
1224 * - encoding: unused
1225 * - decoding: Set by user, if not set the native format will be chosen.
1227 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1230 * maximum number of B-frames between non-B-frames
1231 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1232 * - encoding: Set by user.
1233 * - decoding: unused
1238 * qscale factor between IP and B-frames
1239 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1240 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1241 * - encoding: Set by user.
1242 * - decoding: unused
1244 float b_quant_factor;
1246 /** obsolete FIXME remove */
1248 #define FF_RC_STRATEGY_XVID 1
1250 int b_frame_strategy;
1253 * qscale offset between IP and B-frames
1254 * - encoding: Set by user.
1255 * - decoding: unused
1257 float b_quant_offset;
1260 * Size of the frame reordering buffer in the decoder.
1261 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1262 * - encoding: Set by libavcodec.
1263 * - decoding: Set by libavcodec.
1268 * 0-> h263 quant 1-> mpeg quant
1269 * - encoding: Set by user.
1270 * - decoding: unused
1275 * qscale factor between P and I-frames
1276 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1277 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1278 * - encoding: Set by user.
1279 * - decoding: unused
1281 float i_quant_factor;
1284 * qscale offset between P and I-frames
1285 * - encoding: Set by user.
1286 * - decoding: unused
1288 float i_quant_offset;
1291 * luminance masking (0-> disabled)
1292 * - encoding: Set by user.
1293 * - decoding: unused
1298 * temporary complexity masking (0-> disabled)
1299 * - encoding: Set by user.
1300 * - decoding: unused
1302 float temporal_cplx_masking;
1305 * spatial complexity masking (0-> disabled)
1306 * - encoding: Set by user.
1307 * - decoding: unused
1309 float spatial_cplx_masking;
1312 * p block masking (0-> disabled)
1313 * - encoding: Set by user.
1314 * - decoding: unused
1319 * darkness masking (0-> disabled)
1320 * - encoding: Set by user.
1321 * - decoding: unused
1327 * - encoding: Set by libavcodec.
1328 * - decoding: Set by user (or 0).
1332 * prediction method (needed for huffyuv)
1333 * - encoding: Set by user.
1334 * - decoding: unused
1336 int prediction_method;
1337 #define FF_PRED_LEFT 0
1338 #define FF_PRED_PLANE 1
1339 #define FF_PRED_MEDIAN 2
1342 * slice offsets in the frame in bytes
1343 * - encoding: Set/allocated by libavcodec.
1344 * - decoding: Set/allocated by user (or NULL).
1349 * sample aspect ratio (0 if unknown)
1350 * That is the width of a pixel divided by the height of the pixel.
1351 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1352 * - encoding: Set by user.
1353 * - decoding: Set by libavcodec.
1355 AVRational sample_aspect_ratio;
1358 * motion estimation comparison function
1359 * - encoding: Set by user.
1360 * - decoding: unused
1364 * subpixel motion estimation comparison function
1365 * - encoding: Set by user.
1366 * - decoding: unused
1370 * macroblock comparison function (not supported yet)
1371 * - encoding: Set by user.
1372 * - decoding: unused
1376 * interlaced DCT comparison function
1377 * - encoding: Set by user.
1378 * - decoding: unused
1381 #define FF_CMP_SAD 0
1382 #define FF_CMP_SSE 1
1383 #define FF_CMP_SATD 2
1384 #define FF_CMP_DCT 3
1385 #define FF_CMP_PSNR 4
1386 #define FF_CMP_BIT 5
1388 #define FF_CMP_ZERO 7
1389 #define FF_CMP_VSAD 8
1390 #define FF_CMP_VSSE 9
1391 #define FF_CMP_NSSE 10
1392 #define FF_CMP_DCTMAX 13
1393 #define FF_CMP_DCT264 14
1394 #define FF_CMP_CHROMA 256
1397 * ME diamond size & shape
1398 * - encoding: Set by user.
1399 * - decoding: unused
1404 * amount of previous MV predictors (2a+1 x 2a+1 square)
1405 * - encoding: Set by user.
1406 * - decoding: unused
1408 int last_predictor_count;
1411 * prepass for motion estimation
1412 * - encoding: Set by user.
1413 * - decoding: unused
1418 * motion estimation prepass comparison function
1419 * - encoding: Set by user.
1420 * - decoding: unused
1425 * ME prepass diamond size & shape
1426 * - encoding: Set by user.
1427 * - decoding: unused
1433 * - encoding: Set by user.
1434 * - decoding: unused
1436 int me_subpel_quality;
1439 * DTG active format information (additional aspect ratio
1440 * information only used in DVB MPEG-2 transport streams)
1443 * - encoding: unused
1444 * - decoding: Set by decoder.
1446 int dtg_active_format;
1447 #define FF_DTG_AFD_SAME 8
1448 #define FF_DTG_AFD_4_3 9
1449 #define FF_DTG_AFD_16_9 10
1450 #define FF_DTG_AFD_14_9 11
1451 #define FF_DTG_AFD_4_3_SP_14_9 13
1452 #define FF_DTG_AFD_16_9_SP_14_9 14
1453 #define FF_DTG_AFD_SP_4_3 15
1456 * maximum motion estimation search range in subpel units
1457 * If 0 then no limit.
1459 * - encoding: Set by user.
1460 * - decoding: unused
1465 * intra quantizer bias
1466 * - encoding: Set by user.
1467 * - decoding: unused
1469 int intra_quant_bias;
1470 #define FF_DEFAULT_QUANT_BIAS 999999
1473 * inter quantizer bias
1474 * - encoding: Set by user.
1475 * - decoding: unused
1477 int inter_quant_bias;
1481 * - encoding: unused
1482 * - decoding: Set by user.
1485 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1486 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1487 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1490 * XVideo Motion Acceleration
1491 * - encoding: forbidden
1492 * - decoding: set by decoder
1494 int xvmc_acceleration;
1497 * macroblock decision mode
1498 * - encoding: Set by user.
1499 * - decoding: unused
1502 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1503 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1504 #define FF_MB_DECISION_RD 2 ///< rate distortion
1507 * custom intra quantization matrix
1508 * - encoding: Set by user, can be NULL.
1509 * - decoding: Set by libavcodec.
1511 uint16_t *intra_matrix;
1514 * custom inter quantization matrix
1515 * - encoding: Set by user, can be NULL.
1516 * - decoding: Set by libavcodec.
1518 uint16_t *inter_matrix;
1521 * scene change detection threshold
1522 * 0 is default, larger means fewer detected scene changes.
1523 * - encoding: Set by user.
1524 * - decoding: unused
1526 int scenechange_threshold;
1529 * noise reduction strength
1530 * - encoding: Set by user.
1531 * - decoding: unused
1533 int noise_reduction;
1536 * Motion estimation threshold below which no motion estimation is
1537 * performed, but instead the user specified motion vectors are used.
1539 * - encoding: Set by user.
1540 * - decoding: unused
1545 * Macroblock threshold below which the user specified macroblock types will be used.
1546 * - encoding: Set by user.
1547 * - decoding: unused
1552 * precision of the intra DC coefficient - 8
1553 * - encoding: Set by user.
1554 * - decoding: unused
1556 int intra_dc_precision;
1559 * Number of macroblock rows at the top which are skipped.
1560 * - encoding: unused
1561 * - decoding: Set by user.
1566 * Number of macroblock rows at the bottom which are skipped.
1567 * - encoding: unused
1568 * - decoding: Set by user.
1573 * Border processing masking, raises the quantizer for mbs on the borders
1575 * - encoding: Set by user.
1576 * - decoding: unused
1578 float border_masking;
1581 * minimum MB lagrange multipler
1582 * - encoding: Set by user.
1583 * - decoding: unused
1588 * maximum MB lagrange multipler
1589 * - encoding: Set by user.
1590 * - decoding: unused
1596 * - encoding: Set by user.
1597 * - decoding: unused
1599 int me_penalty_compensation;
1603 * - encoding: Set by user.
1604 * - decoding: unused
1610 * - encoding: Set by user.
1611 * - decoding: unused
1617 * - encoding: Set by user.
1618 * - decoding: unused
1623 * number of reference frames
1624 * - encoding: Set by user.
1625 * - decoding: Set by lavc.
1630 * chroma qp offset from luma
1631 * - encoding: Set by user.
1632 * - decoding: unused
1637 * Multiplied by qscale for each frame and added to scene_change_score.
1638 * - encoding: Set by user.
1639 * - decoding: unused
1641 int scenechange_factor;
1645 * Note: Value depends upon the compare function used for fullpel ME.
1646 * - encoding: Set by user.
1647 * - decoding: unused
1652 * Adjust sensitivity of b_frame_strategy 1.
1653 * - encoding: Set by user.
1654 * - decoding: unused
1659 * Chromaticity coordinates of the source primaries.
1660 * - encoding: Set by user
1661 * - decoding: Set by libavcodec
1663 enum AVColorPrimaries color_primaries;
1666 * Color Transfer Characteristic.
1667 * - encoding: Set by user
1668 * - decoding: Set by libavcodec
1670 enum AVColorTransferCharacteristic color_trc;
1673 * YUV colorspace type.
1674 * - encoding: Set by user
1675 * - decoding: Set by libavcodec
1677 enum AVColorSpace colorspace;
1680 * MPEG vs JPEG YUV range.
1681 * - encoding: Set by user
1682 * - decoding: Set by libavcodec
1684 enum AVColorRange color_range;
1687 * This defines the location of chroma samples.
1688 * - encoding: Set by user
1689 * - decoding: Set by libavcodec
1691 enum AVChromaLocation chroma_sample_location;
1695 * Indicates number of picture subdivisions. Used for parallelized
1697 * - encoding: Set by user
1698 * - decoding: unused
1703 * - encoding: set by libavcodec
1704 * - decoding: Set by libavcodec
1706 enum AVFieldOrder field_order;
1709 int sample_rate; ///< samples per second
1710 int channels; ///< number of audio channels
1713 * audio sample format
1714 * - encoding: Set by user.
1715 * - decoding: Set by libavcodec.
1717 enum AVSampleFormat sample_fmt; ///< sample format
1719 /* The following data should not be initialized. */
1721 * Number of samples per channel in an audio frame.
1723 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1724 * except the last must contain exactly frame_size samples per channel.
1725 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1726 * frame size is not restricted.
1727 * - decoding: may be set by some decoders to indicate constant frame size
1732 * Frame counter, set by libavcodec.
1734 * - decoding: total number of frames returned from the decoder so far.
1735 * - encoding: total number of frames passed to the encoder so far.
1737 * @note the counter is not incremented if encoding/decoding resulted in
1743 * number of bytes per packet if constant and known or 0
1744 * Used by some WAV based audio codecs.
1749 * Audio cutoff bandwidth (0 means "automatic")
1750 * - encoding: Set by user.
1751 * - decoding: unused
1755 #if FF_API_REQUEST_CHANNELS
1757 * Decoder should decode to this many channels if it can (0 for default)
1758 * - encoding: unused
1759 * - decoding: Set by user.
1760 * @deprecated Deprecated in favor of request_channel_layout.
1762 int request_channels;
1766 * Audio channel layout.
1767 * - encoding: set by user.
1768 * - decoding: set by libavcodec.
1770 uint64_t channel_layout;
1773 * Request decoder to use this channel layout if it can (0 for default)
1774 * - encoding: unused
1775 * - decoding: Set by user.
1777 uint64_t request_channel_layout;
1780 * Type of service that the audio stream conveys.
1781 * - encoding: Set by user.
1782 * - decoding: Set by libavcodec.
1784 enum AVAudioServiceType audio_service_type;
1787 * Used to request a sample format from the decoder.
1788 * - encoding: unused.
1789 * - decoding: Set by user.
1791 enum AVSampleFormat request_sample_fmt;
1793 #if FF_API_GET_BUFFER
1795 * Called at the beginning of each frame to get a buffer for it.
1797 * The function will set AVFrame.data[], AVFrame.linesize[].
1798 * AVFrame.extended_data[] must also be set, but it should be the same as
1799 * AVFrame.data[] except for planar audio with more channels than can fit
1800 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1801 * many data pointers as it can hold.
1803 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1804 * avcodec_default_get_buffer() instead of providing buffers allocated by
1807 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1808 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1809 * but if get_buffer() is overridden then alignment considerations should
1810 * be taken into account.
1812 * @see avcodec_default_get_buffer()
1816 * If pic.reference is set then the frame will be read later by libavcodec.
1817 * avcodec_align_dimensions2() should be used to find the required width and
1818 * height, as they normally need to be rounded up to the next multiple of 16.
1820 * If frame multithreading is used and thread_safe_callbacks is set,
1821 * it may be called from a different thread, but not from more than one at
1822 * once. Does not need to be reentrant.
1824 * @see release_buffer(), reget_buffer()
1825 * @see avcodec_align_dimensions2()
1829 * Decoders request a buffer of a particular size by setting
1830 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1831 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1832 * to a smaller value in the output frame.
1834 * Decoders cannot use the buffer after returning from
1835 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1836 * is assumed to be released immediately upon return. In some rare cases,
1837 * a decoder may need to call get_buffer() more than once in a single
1838 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1839 * called again after it has already been called once, the previously
1840 * acquired buffer is assumed to be released at that time and may not be
1841 * reused by the decoder.
1843 * As a convenience, av_samples_get_buffer_size() and
1844 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1845 * functions to find the required data size and to fill data pointers and
1846 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1847 * since all planes must be the same size.
1849 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1851 * - encoding: unused
1852 * - decoding: Set by libavcodec, user can override.
1854 * @deprecated use get_buffer2()
1856 attribute_deprecated
1857 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1860 * Called to release buffers which were allocated with get_buffer.
1861 * A released buffer can be reused in get_buffer().
1862 * pic.data[*] must be set to NULL.
1863 * May be called from a different thread if frame multithreading is used,
1864 * but not by more than one thread at once, so does not need to be reentrant.
1865 * - encoding: unused
1866 * - decoding: Set by libavcodec, user can override.
1868 * @deprecated custom freeing callbacks should be set from get_buffer2()
1870 attribute_deprecated
1871 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1874 * Called at the beginning of a frame to get cr buffer for it.
1875 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1876 * libavcodec will pass previous buffer in pic, function should return
1877 * same buffer or new buffer with old frame "painted" into it.
1878 * If pic.data[0] == NULL must behave like get_buffer().
1879 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1880 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1882 * - encoding: unused
1883 * - decoding: Set by libavcodec, user can override.
1885 attribute_deprecated
1886 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1890 * This callback is called at the beginning of each frame to get data
1891 * buffer(s) for it. There may be one contiguous buffer for all the data or
1892 * there may be a buffer per each data plane or anything in between. Each
1893 * buffer must be reference-counted using the AVBuffer API.
1895 * The following fields will be set in the frame before this callback is
1898 * - width, height (video only)
1899 * - sample_rate, channel_layout, nb_samples (audio only)
1900 * Their values may differ from the corresponding values in
1901 * AVCodecContext. This callback must use the frame values, not the codec
1902 * context values, to calculate the required buffer size.
1904 * This callback must fill the following fields in the frame:
1908 * * if the data is planar audio with more than 8 channels, then this
1909 * callback must allocate and fill extended_data to contain all pointers
1910 * to all data planes. data[] must hold as many pointers as it can.
1911 * extended_data must be allocated with av_malloc() and will be freed in
1913 * * otherwise exended_data must point to data
1914 * - buf[] must contain references to the buffers that contain the frame
1916 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1917 * this callback and filled with the extra buffers if there are more
1918 * buffers than buf[] can hold. extended_buf will be freed in
1921 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
1922 * avcodec_default_get_buffer2() instead of providing buffers allocated by
1925 * Each data plane must be aligned to the maximum required by the target
1928 * @see avcodec_default_get_buffer2()
1932 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
1933 * (read and/or written to if it is writable) later by libavcodec.
1935 * If CODEC_FLAG_EMU_EDGE is not set in s->flags, the buffer must contain an
1936 * edge of the size returned by avcodec_get_edge_width() on all sides.
1938 * avcodec_align_dimensions2() should be used to find the required width and
1939 * height, as they normally need to be rounded up to the next multiple of 16.
1941 * If frame multithreading is used and thread_safe_callbacks is set,
1942 * this callback may be called from a different thread, but not from more
1943 * than one at once. Does not need to be reentrant.
1945 * @see avcodec_align_dimensions2()
1949 * Decoders request a buffer of a particular size by setting
1950 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
1951 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1952 * to a smaller value in the output frame.
1954 * As a convenience, av_samples_get_buffer_size() and
1955 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
1956 * functions to find the required data size and to fill data pointers and
1957 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1958 * since all planes must be the same size.
1960 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1962 * - encoding: unused
1963 * - decoding: Set by libavcodec, user can override.
1965 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
1968 * If non-zero, the decoded audio and video frames returned from
1969 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
1970 * and are valid indefinitely. The caller must free them with
1971 * av_frame_unref() when they are not needed anymore.
1972 * Otherwise, the decoded frames must not be freed by the caller and are
1973 * only valid until the next decode call.
1975 * - encoding: unused
1976 * - decoding: set by the caller before avcodec_open2().
1978 int refcounted_frames;
1980 /* - encoding parameters */
1981 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1982 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
1986 * - encoding: Set by user.
1987 * - decoding: unused
1993 * - encoding: Set by user.
1994 * - decoding: unused
1999 * maximum quantizer difference between frames
2000 * - encoding: Set by user.
2001 * - decoding: unused
2006 * ratecontrol qmin qmax limiting method
2007 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2008 * - encoding: Set by user.
2009 * - decoding: unused
2017 * decoder bitstream buffer size
2018 * - encoding: Set by user.
2019 * - decoding: unused
2024 * ratecontrol override, see RcOverride
2025 * - encoding: Allocated/set/freed by user.
2026 * - decoding: unused
2028 int rc_override_count;
2029 RcOverride *rc_override;
2032 * rate control equation
2033 * - encoding: Set by user
2034 * - decoding: unused
2040 * - encoding: Set by user.
2041 * - decoding: unused
2047 * - encoding: Set by user.
2048 * - decoding: unused
2052 float rc_buffer_aggressivity;
2055 * initial complexity for pass1 ratecontrol
2056 * - encoding: Set by user.
2057 * - decoding: unused
2059 float rc_initial_cplx;
2062 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2063 * - encoding: Set by user.
2064 * - decoding: unused.
2066 float rc_max_available_vbv_use;
2069 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2070 * - encoding: Set by user.
2071 * - decoding: unused.
2073 float rc_min_vbv_overflow_use;
2076 * Number of bits which should be loaded into the rc buffer before decoding starts.
2077 * - encoding: Set by user.
2078 * - decoding: unused
2080 int rc_initial_buffer_occupancy;
2082 #define FF_CODER_TYPE_VLC 0
2083 #define FF_CODER_TYPE_AC 1
2084 #define FF_CODER_TYPE_RAW 2
2085 #define FF_CODER_TYPE_RLE 3
2086 #define FF_CODER_TYPE_DEFLATE 4
2089 * - encoding: Set by user.
2090 * - decoding: unused
2096 * - encoding: Set by user.
2097 * - decoding: unused
2102 * minimum Lagrange multipler
2103 * - encoding: Set by user.
2104 * - decoding: unused
2109 * maximum Lagrange multipler
2110 * - encoding: Set by user.
2111 * - decoding: unused
2116 * frame skip threshold
2117 * - encoding: Set by user.
2118 * - decoding: unused
2120 int frame_skip_threshold;
2124 * - encoding: Set by user.
2125 * - decoding: unused
2127 int frame_skip_factor;
2130 * frame skip exponent
2131 * - encoding: Set by user.
2132 * - decoding: unused
2137 * frame skip comparison function
2138 * - encoding: Set by user.
2139 * - decoding: unused
2144 * trellis RD quantization
2145 * - encoding: Set by user.
2146 * - decoding: unused
2151 * - encoding: Set by user.
2152 * - decoding: unused
2154 int min_prediction_order;
2157 * - encoding: Set by user.
2158 * - decoding: unused
2160 int max_prediction_order;
2163 * GOP timecode frame start number, in non drop frame format
2164 * - encoding: Set by user.
2165 * - decoding: unused
2167 int64_t timecode_frame_start;
2169 /* The RTP callback: This function is called */
2170 /* every time the encoder has a packet to send. */
2171 /* It depends on the encoder if the data starts */
2172 /* with a Start Code (it should). H.263 does. */
2173 /* mb_nb contains the number of macroblocks */
2174 /* encoded in the RTP payload. */
2175 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2177 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2178 /* do its best to deliver a chunk with size */
2179 /* below rtp_payload_size, the chunk will start */
2180 /* with a start code on some codecs like H.263. */
2181 /* This doesn't take account of any particular */
2182 /* headers inside the transmitted RTP payload. */
2184 /* statistics, used for 2-pass encoding */
2195 * number of bits used for the previously encoded frame
2196 * - encoding: Set by libavcodec.
2197 * - decoding: unused
2202 * pass1 encoding statistics output buffer
2203 * - encoding: Set by libavcodec.
2204 * - decoding: unused
2209 * pass2 encoding statistics input buffer
2210 * Concatenated stuff from stats_out of pass1 should be placed here.
2211 * - encoding: Allocated/set/freed by user.
2212 * - decoding: unused
2217 * Work around bugs in encoders which sometimes cannot be detected automatically.
2218 * - encoding: Set by user
2219 * - decoding: Set by user
2221 int workaround_bugs;
2222 #define FF_BUG_AUTODETECT 1 ///< autodetection
2223 #define FF_BUG_OLD_MSMPEG4 2
2224 #define FF_BUG_XVID_ILACE 4
2225 #define FF_BUG_UMP4 8
2226 #define FF_BUG_NO_PADDING 16
2227 #define FF_BUG_AMV 32
2228 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2229 #define FF_BUG_QPEL_CHROMA 64
2230 #define FF_BUG_STD_QPEL 128
2231 #define FF_BUG_QPEL_CHROMA2 256
2232 #define FF_BUG_DIRECT_BLOCKSIZE 512
2233 #define FF_BUG_EDGE 1024
2234 #define FF_BUG_HPEL_CHROMA 2048
2235 #define FF_BUG_DC_CLIP 4096
2236 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2237 #define FF_BUG_TRUNCATED 16384
2240 * strictly follow the standard (MPEG4, ...).
2241 * - encoding: Set by user.
2242 * - decoding: Set by user.
2243 * Setting this to STRICT or higher means the encoder and decoder will
2244 * generally do stupid things, whereas setting it to unofficial or lower
2245 * will mean the encoder might produce output that is not supported by all
2246 * spec-compliant decoders. Decoders don't differentiate between normal,
2247 * unofficial and experimental (that is, they always try to decode things
2248 * when they can) unless they are explicitly asked to behave stupidly
2249 * (=strictly conform to the specs)
2251 int strict_std_compliance;
2252 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2253 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2254 #define FF_COMPLIANCE_NORMAL 0
2255 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2256 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2259 * error concealment flags
2260 * - encoding: unused
2261 * - decoding: Set by user.
2263 int error_concealment;
2264 #define FF_EC_GUESS_MVS 1
2265 #define FF_EC_DEBLOCK 2
2269 * - encoding: Set by user.
2270 * - decoding: Set by user.
2273 #define FF_DEBUG_PICT_INFO 1
2274 #define FF_DEBUG_RC 2
2275 #define FF_DEBUG_BITSTREAM 4
2276 #define FF_DEBUG_MB_TYPE 8
2277 #define FF_DEBUG_QP 16
2278 #define FF_DEBUG_MV 32
2279 #define FF_DEBUG_DCT_COEFF 0x00000040
2280 #define FF_DEBUG_SKIP 0x00000080
2281 #define FF_DEBUG_STARTCODE 0x00000100
2282 #define FF_DEBUG_PTS 0x00000200
2283 #define FF_DEBUG_ER 0x00000400
2284 #define FF_DEBUG_MMCO 0x00000800
2285 #define FF_DEBUG_BUGS 0x00001000
2286 #define FF_DEBUG_VIS_QP 0x00002000
2287 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2288 #define FF_DEBUG_BUFFERS 0x00008000
2289 #define FF_DEBUG_THREADS 0x00010000
2293 * - encoding: Set by user.
2294 * - decoding: Set by user.
2297 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2298 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2299 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2302 * Error recognition; may misdetect some more or less valid parts as errors.
2303 * - encoding: unused
2304 * - decoding: Set by user.
2306 int err_recognition;
2307 #define AV_EF_CRCCHECK (1<<0)
2308 #define AV_EF_BITSTREAM (1<<1)
2309 #define AV_EF_BUFFER (1<<2)
2310 #define AV_EF_EXPLODE (1<<3)
2313 * opaque 64bit number (generally a PTS) that will be reordered and
2314 * output in AVFrame.reordered_opaque
2315 * @deprecated in favor of pkt_pts
2316 * - encoding: unused
2317 * - decoding: Set by user.
2319 int64_t reordered_opaque;
2322 * Hardware accelerator in use
2323 * - encoding: unused.
2324 * - decoding: Set by libavcodec
2326 struct AVHWAccel *hwaccel;
2329 * Hardware accelerator context.
2330 * For some hardware accelerators, a global context needs to be
2331 * provided by the user. In that case, this holds display-dependent
2332 * data Libav cannot instantiate itself. Please refer to the
2333 * Libav HW accelerator documentation to know how to fill this
2334 * is. e.g. for VA API, this is a struct vaapi_context.
2335 * - encoding: unused
2336 * - decoding: Set by user
2338 void *hwaccel_context;
2342 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2343 * - decoding: unused
2345 uint64_t error[AV_NUM_DATA_POINTERS];
2348 * DCT algorithm, see FF_DCT_* below
2349 * - encoding: Set by user.
2350 * - decoding: unused
2353 #define FF_DCT_AUTO 0
2354 #define FF_DCT_FASTINT 1
2355 #define FF_DCT_INT 2
2356 #define FF_DCT_MMX 3
2357 #define FF_DCT_ALTIVEC 5
2358 #define FF_DCT_FAAN 6
2361 * IDCT algorithm, see FF_IDCT_* below.
2362 * - encoding: Set by user.
2363 * - decoding: Set by user.
2366 #define FF_IDCT_AUTO 0
2367 #define FF_IDCT_INT 1
2368 #define FF_IDCT_SIMPLE 2
2369 #define FF_IDCT_SIMPLEMMX 3
2370 #define FF_IDCT_ARM 7
2371 #define FF_IDCT_ALTIVEC 8
2372 #define FF_IDCT_SH4 9
2373 #define FF_IDCT_SIMPLEARM 10
2374 #define FF_IDCT_IPP 13
2375 #define FF_IDCT_XVIDMMX 14
2376 #define FF_IDCT_SIMPLEARMV5TE 16
2377 #define FF_IDCT_SIMPLEARMV6 17
2378 #define FF_IDCT_SIMPLEVIS 18
2379 #define FF_IDCT_FAAN 20
2380 #define FF_IDCT_SIMPLENEON 22
2381 #define FF_IDCT_SIMPLEALPHA 23
2384 * bits per sample/pixel from the demuxer (needed for huffyuv).
2385 * - encoding: Set by libavcodec.
2386 * - decoding: Set by user.
2388 int bits_per_coded_sample;
2391 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2392 * - encoding: set by user.
2393 * - decoding: set by libavcodec.
2395 int bits_per_raw_sample;
2398 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2399 * - encoding: unused
2400 * - decoding: Set by user.
2402 attribute_deprecated int lowres;
2405 * the picture in the bitstream
2406 * - encoding: Set by libavcodec.
2407 * - decoding: Set by libavcodec.
2409 AVFrame *coded_frame;
2413 * is used to decide how many independent tasks should be passed to execute()
2414 * - encoding: Set by user.
2415 * - decoding: Set by user.
2420 * Which multithreading methods to use.
2421 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2422 * so clients which cannot provide future frames should not use it.
2424 * - encoding: Set by user, otherwise the default is used.
2425 * - decoding: Set by user, otherwise the default is used.
2428 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2429 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2432 * Which multithreading methods are in use by the codec.
2433 * - encoding: Set by libavcodec.
2434 * - decoding: Set by libavcodec.
2436 int active_thread_type;
2439 * Set by the client if its custom get_buffer() callback can be called
2440 * synchronously from another thread, which allows faster multithreaded decoding.
2441 * draw_horiz_band() will be called from other threads regardless of this setting.
2442 * Ignored if the default get_buffer() is used.
2443 * - encoding: Set by user.
2444 * - decoding: Set by user.
2446 int thread_safe_callbacks;
2449 * The codec may call this to execute several independent things.
2450 * It will return only after finishing all tasks.
2451 * The user may replace this with some multithreaded implementation,
2452 * the default implementation will execute the parts serially.
2453 * @param count the number of things to execute
2454 * - encoding: Set by libavcodec, user can override.
2455 * - decoding: Set by libavcodec, user can override.
2457 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2460 * The codec may call this to execute several independent things.
2461 * It will return only after finishing all tasks.
2462 * The user may replace this with some multithreaded implementation,
2463 * the default implementation will execute the parts serially.
2464 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2465 * @param c context passed also to func
2466 * @param count the number of things to execute
2467 * @param arg2 argument passed unchanged to func
2468 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2469 * @param func function that will be called count times, with jobnr from 0 to count-1.
2470 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2471 * two instances of func executing at the same time will have the same threadnr.
2472 * @return always 0 currently, but code should handle a future improvement where when any call to func
2473 * returns < 0 no further calls to func may be done and < 0 is returned.
2474 * - encoding: Set by libavcodec, user can override.
2475 * - decoding: Set by libavcodec, user can override.
2477 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2481 * Can be used by execute() to store some per AVCodecContext stuff.
2482 * - encoding: set by execute()
2483 * - decoding: set by execute()
2485 void *thread_opaque;
2488 * noise vs. sse weight for the nsse comparsion function
2489 * - encoding: Set by user.
2490 * - decoding: unused
2496 * - encoding: Set by user.
2497 * - decoding: Set by libavcodec.
2500 #define FF_PROFILE_UNKNOWN -99
2501 #define FF_PROFILE_RESERVED -100
2503 #define FF_PROFILE_AAC_MAIN 0
2504 #define FF_PROFILE_AAC_LOW 1
2505 #define FF_PROFILE_AAC_SSR 2
2506 #define FF_PROFILE_AAC_LTP 3
2507 #define FF_PROFILE_AAC_HE 4
2508 #define FF_PROFILE_AAC_HE_V2 28
2509 #define FF_PROFILE_AAC_LD 22
2510 #define FF_PROFILE_AAC_ELD 38
2512 #define FF_PROFILE_DTS 20
2513 #define FF_PROFILE_DTS_ES 30
2514 #define FF_PROFILE_DTS_96_24 40
2515 #define FF_PROFILE_DTS_HD_HRA 50
2516 #define FF_PROFILE_DTS_HD_MA 60
2518 #define FF_PROFILE_MPEG2_422 0
2519 #define FF_PROFILE_MPEG2_HIGH 1
2520 #define FF_PROFILE_MPEG2_SS 2
2521 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2522 #define FF_PROFILE_MPEG2_MAIN 4
2523 #define FF_PROFILE_MPEG2_SIMPLE 5
2525 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2526 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2528 #define FF_PROFILE_H264_BASELINE 66
2529 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2530 #define FF_PROFILE_H264_MAIN 77
2531 #define FF_PROFILE_H264_EXTENDED 88
2532 #define FF_PROFILE_H264_HIGH 100
2533 #define FF_PROFILE_H264_HIGH_10 110
2534 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2535 #define FF_PROFILE_H264_HIGH_422 122
2536 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2537 #define FF_PROFILE_H264_HIGH_444 144
2538 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2539 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2540 #define FF_PROFILE_H264_CAVLC_444 44
2542 #define FF_PROFILE_VC1_SIMPLE 0
2543 #define FF_PROFILE_VC1_MAIN 1
2544 #define FF_PROFILE_VC1_COMPLEX 2
2545 #define FF_PROFILE_VC1_ADVANCED 3
2547 #define FF_PROFILE_MPEG4_SIMPLE 0
2548 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2549 #define FF_PROFILE_MPEG4_CORE 2
2550 #define FF_PROFILE_MPEG4_MAIN 3
2551 #define FF_PROFILE_MPEG4_N_BIT 4
2552 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2553 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2554 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2555 #define FF_PROFILE_MPEG4_HYBRID 8
2556 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2557 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2558 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2559 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2560 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2561 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2562 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2566 * - encoding: Set by user.
2567 * - decoding: Set by libavcodec.
2570 #define FF_LEVEL_UNKNOWN -99
2574 * - encoding: unused
2575 * - decoding: Set by user.
2577 enum AVDiscard skip_loop_filter;
2581 * - encoding: unused
2582 * - decoding: Set by user.
2584 enum AVDiscard skip_idct;
2588 * - encoding: unused
2589 * - decoding: Set by user.
2591 enum AVDiscard skip_frame;
2594 * Header containing style information for text subtitles.
2595 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2596 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2597 * the Format line following. It shouldn't include any Dialogue line.
2598 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2599 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2601 uint8_t *subtitle_header;
2602 int subtitle_header_size;
2605 * Simulates errors in the bitstream to test error concealment.
2606 * - encoding: Set by user.
2607 * - decoding: unused
2612 * Current packet as passed into the decoder, to avoid having
2613 * to pass the packet into every function. Currently only valid
2614 * inside lavc and get/release_buffer callbacks.
2615 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2616 * - encoding: unused
2621 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2622 * Used for compliant TS muxing.
2623 * - encoding: Set by libavcodec.
2624 * - decoding: unused.
2632 typedef struct AVProfile {
2634 const char *name; ///< short name for the profile
2637 typedef struct AVCodecDefault AVCodecDefault;
2644 typedef struct AVCodec {
2646 * Name of the codec implementation.
2647 * The name is globally unique among encoders and among decoders (but an
2648 * encoder and a decoder can share the same name).
2649 * This is the primary way to find a codec from the user perspective.
2653 * Descriptive name for the codec, meant to be more human readable than name.
2654 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2656 const char *long_name;
2657 enum AVMediaType type;
2660 * Codec capabilities.
2664 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2665 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2666 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2667 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2668 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2669 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2670 const AVClass *priv_class; ///< AVClass for the private context
2671 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2673 /*****************************************************************
2674 * No fields below this line are part of the public API. They
2675 * may not be used outside of libavcodec and can be changed and
2677 * New public fields should be added right above.
2678 *****************************************************************
2681 struct AVCodec *next;
2683 * @name Frame-level threading support functions
2687 * If defined, called on thread contexts when they are created.
2688 * If the codec allocates writable tables in init(), re-allocate them here.
2689 * priv_data will be set to a copy of the original.
2691 int (*init_thread_copy)(AVCodecContext *);
2693 * Copy necessary context variables from a previous thread context to the current one.
2694 * If not defined, the next thread will start automatically; otherwise, the codec
2695 * must call ff_thread_finish_setup().
2697 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2699 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2703 * Private codec-specific defaults.
2705 const AVCodecDefault *defaults;
2708 * Initialize codec static data, called from avcodec_register().
2710 void (*init_static_data)(struct AVCodec *codec);
2712 int (*init)(AVCodecContext *);
2713 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2714 const struct AVSubtitle *sub);
2716 * Encode data to an AVPacket.
2718 * @param avctx codec context
2719 * @param avpkt output AVPacket (may contain a user-provided buffer)
2720 * @param[in] frame AVFrame containing the raw data to be encoded
2721 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2722 * non-empty packet was returned in avpkt.
2723 * @return 0 on success, negative error code on failure
2725 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2726 int *got_packet_ptr);
2727 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2728 int (*close)(AVCodecContext *);
2731 * Will be called when seeking
2733 void (*flush)(AVCodecContext *);
2739 typedef struct AVHWAccel {
2741 * Name of the hardware accelerated codec.
2742 * The name is globally unique among encoders and among decoders (but an
2743 * encoder and a decoder can share the same name).
2748 * Type of codec implemented by the hardware accelerator.
2750 * See AVMEDIA_TYPE_xxx
2752 enum AVMediaType type;
2755 * Codec implemented by the hardware accelerator.
2757 * See AV_CODEC_ID_xxx
2762 * Supported pixel format.
2764 * Only hardware accelerated formats are supported here.
2766 enum AVPixelFormat pix_fmt;
2769 * Hardware accelerated codec capabilities.
2770 * see FF_HWACCEL_CODEC_CAP_*
2774 struct AVHWAccel *next;
2777 * Called at the beginning of each frame or field picture.
2779 * Meaningful frame information (codec specific) is guaranteed to
2780 * be parsed at this point. This function is mandatory.
2782 * Note that buf can be NULL along with buf_size set to 0.
2783 * Otherwise, this means the whole frame is available at this point.
2785 * @param avctx the codec context
2786 * @param buf the frame data buffer base
2787 * @param buf_size the size of the frame in bytes
2788 * @return zero if successful, a negative value otherwise
2790 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2793 * Callback for each slice.
2795 * Meaningful slice information (codec specific) is guaranteed to
2796 * be parsed at this point. This function is mandatory.
2798 * @param avctx the codec context
2799 * @param buf the slice data buffer base
2800 * @param buf_size the size of the slice in bytes
2801 * @return zero if successful, a negative value otherwise
2803 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2806 * Called at the end of each frame or field picture.
2808 * The whole picture is parsed at this point and can now be sent
2809 * to the hardware accelerator. This function is mandatory.
2811 * @param avctx the codec context
2812 * @return zero if successful, a negative value otherwise
2814 int (*end_frame)(AVCodecContext *avctx);
2817 * Size of HW accelerator private data.
2819 * Private data is allocated with av_mallocz() before
2820 * AVCodecContext.get_buffer() and deallocated after
2821 * AVCodecContext.release_buffer().
2827 * @defgroup lavc_picture AVPicture
2829 * Functions for working with AVPicture
2834 * four components are given, that's all.
2835 * the last component is alpha
2837 typedef struct AVPicture {
2838 uint8_t *data[AV_NUM_DATA_POINTERS];
2839 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2846 #define AVPALETTE_SIZE 1024
2847 #define AVPALETTE_COUNT 256
2849 enum AVSubtitleType {
2852 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2855 * Plain text, the text field must be set by the decoder and is
2856 * authoritative. ass and pict fields may contain approximations.
2861 * Formatted text, the ass field must be set by the decoder and is
2862 * authoritative. pict and text fields may contain approximations.
2867 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
2869 typedef struct AVSubtitleRect {
2870 int x; ///< top left corner of pict, undefined when pict is not set
2871 int y; ///< top left corner of pict, undefined when pict is not set
2872 int w; ///< width of pict, undefined when pict is not set
2873 int h; ///< height of pict, undefined when pict is not set
2874 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2877 * data+linesize for the bitmap of this subtitle.
2878 * can be set for text/ass as well once they where rendered
2881 enum AVSubtitleType type;
2883 char *text; ///< 0 terminated plain UTF-8 text
2886 * 0 terminated ASS/SSA compatible event line.
2887 * The pressentation of this is unaffected by the other values in this
2894 typedef struct AVSubtitle {
2895 uint16_t format; /* 0 = graphics */
2896 uint32_t start_display_time; /* relative to packet pts, in ms */
2897 uint32_t end_display_time; /* relative to packet pts, in ms */
2899 AVSubtitleRect **rects;
2900 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2904 * If c is NULL, returns the first registered codec,
2905 * if c is non-NULL, returns the next registered codec after c,
2906 * or NULL if c is the last one.
2908 AVCodec *av_codec_next(const AVCodec *c);
2911 * Return the LIBAVCODEC_VERSION_INT constant.
2913 unsigned avcodec_version(void);
2916 * Return the libavcodec build-time configuration.
2918 const char *avcodec_configuration(void);
2921 * Return the libavcodec license.
2923 const char *avcodec_license(void);
2926 * Register the codec codec and initialize libavcodec.
2928 * @warning either this function or avcodec_register_all() must be called
2929 * before any other libavcodec functions.
2931 * @see avcodec_register_all()
2933 void avcodec_register(AVCodec *codec);
2936 * Register all the codecs, parsers and bitstream filters which were enabled at
2937 * configuration time. If you do not call this function you can select exactly
2938 * which formats you want to support, by using the individual registration
2941 * @see avcodec_register
2942 * @see av_register_codec_parser
2943 * @see av_register_bitstream_filter
2945 void avcodec_register_all(void);
2948 * Allocate an AVCodecContext and set its fields to default values. The
2949 * resulting struct can be deallocated by calling avcodec_close() on it followed
2952 * @param codec if non-NULL, allocate private data and initialize defaults
2953 * for the given codec. It is illegal to then call avcodec_open2()
2954 * with a different codec.
2955 * If NULL, then the codec-specific defaults won't be initialized,
2956 * which may result in suboptimal default settings (this is
2957 * important mainly for encoders, e.g. libx264).
2959 * @return An AVCodecContext filled with default values or NULL on failure.
2960 * @see avcodec_get_context_defaults
2962 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
2965 * Set the fields of the given AVCodecContext to default values corresponding
2966 * to the given codec (defaults may be codec-dependent).
2968 * Do not call this function if a non-NULL codec has been passed
2969 * to avcodec_alloc_context3() that allocated this AVCodecContext.
2970 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
2971 * different codec on this AVCodecContext.
2973 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
2976 * Get the AVClass for AVCodecContext. It can be used in combination with
2977 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
2979 * @see av_opt_find().
2981 const AVClass *avcodec_get_class(void);
2984 * Copy the settings of the source AVCodecContext into the destination
2985 * AVCodecContext. The resulting destination codec context will be
2986 * unopened, i.e. you are required to call avcodec_open2() before you
2987 * can use this AVCodecContext to decode/encode video/audio data.
2989 * @param dest target codec context, should be initialized with
2990 * avcodec_alloc_context3(), but otherwise uninitialized
2991 * @param src source codec context
2992 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
2994 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
2997 * Allocate an AVFrame and set its fields to default values. The resulting
2998 * struct must be freed using avcodec_free_frame().
3000 * @return An AVFrame filled with default values or NULL on failure.
3001 * @see avcodec_get_frame_defaults
3003 AVFrame *avcodec_alloc_frame(void);
3006 * Set the fields of the given AVFrame to default values.
3008 * @param frame The AVFrame of which the fields should be set to default values.
3010 void avcodec_get_frame_defaults(AVFrame *frame);
3013 * Free the frame and any dynamically allocated objects in it,
3014 * e.g. extended_data.
3016 * @param frame frame to be freed. The pointer will be set to NULL.
3018 * @warning this function does NOT free the data buffers themselves
3019 * (it does not know how, since they might have been allocated with
3020 * a custom get_buffer()).
3022 void avcodec_free_frame(AVFrame **frame);
3025 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3026 * function the context has to be allocated with avcodec_alloc_context3().
3028 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3029 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3030 * retrieving a codec.
3032 * @warning This function is not thread safe!
3035 * avcodec_register_all();
3036 * av_dict_set(&opts, "b", "2.5M", 0);
3037 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3041 * context = avcodec_alloc_context3(codec);
3043 * if (avcodec_open2(context, codec, opts) < 0)
3047 * @param avctx The context to initialize.
3048 * @param codec The codec to open this context for. If a non-NULL codec has been
3049 * previously passed to avcodec_alloc_context3() or
3050 * avcodec_get_context_defaults3() for this context, then this
3051 * parameter MUST be either NULL or equal to the previously passed
3053 * @param options A dictionary filled with AVCodecContext and codec-private options.
3054 * On return this object will be filled with options that were not found.
3056 * @return zero on success, a negative value on error
3057 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3058 * av_dict_set(), av_opt_find().
3060 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3063 * Close a given AVCodecContext and free all the data associated with it
3064 * (but not the AVCodecContext itself).
3066 * Calling this function on an AVCodecContext that hasn't been opened will free
3067 * the codec-specific data allocated in avcodec_alloc_context3() /
3068 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3071 int avcodec_close(AVCodecContext *avctx);
3074 * Free all allocated data in the given subtitle struct.
3076 * @param sub AVSubtitle to free.
3078 void avsubtitle_free(AVSubtitle *sub);
3085 * @addtogroup lavc_packet
3089 #if FF_API_DESTRUCT_PACKET
3091 * Default packet destructor.
3092 * @deprecated use the AVBuffer API instead
3094 attribute_deprecated
3095 void av_destruct_packet(AVPacket *pkt);
3099 * Initialize optional fields of a packet with default values.
3101 * Note, this does not touch the data and size members, which have to be
3102 * initialized separately.
3106 void av_init_packet(AVPacket *pkt);
3109 * Allocate the payload of a packet and initialize its fields with
3113 * @param size wanted payload size
3114 * @return 0 if OK, AVERROR_xxx otherwise
3116 int av_new_packet(AVPacket *pkt, int size);
3119 * Reduce packet size, correctly zeroing padding
3122 * @param size new size
3124 void av_shrink_packet(AVPacket *pkt, int size);
3127 * Increase packet size, correctly zeroing padding
3130 * @param grow_by number of bytes by which to increase the size of the packet
3132 int av_grow_packet(AVPacket *pkt, int grow_by);
3135 * Initialize a reference-counted packet from av_malloc()ed data.
3137 * @param pkt packet to be initialized. This function will set the data, size,
3138 * buf and destruct fields, all others are left untouched.
3139 * @param data Data allocated by av_malloc() to be used as packet data. If this
3140 * function returns successfully, the data is owned by the underlying AVBuffer.
3141 * The caller may not access the data through other means.
3142 * @param size size of data in bytes, without the padding. I.e. the full buffer
3143 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3145 * @return 0 on success, a negative AVERROR on error
3147 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3150 * @warning This is a hack - the packet memory allocation stuff is broken. The
3151 * packet is allocated if it was not really allocated.
3153 int av_dup_packet(AVPacket *pkt);
3158 * @param pkt packet to free
3160 void av_free_packet(AVPacket *pkt);
3163 * Allocate new information of a packet.
3166 * @param type side information type
3167 * @param size side information size
3168 * @return pointer to fresh allocated data or NULL otherwise
3170 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3174 * Shrink the already allocated side data buffer
3177 * @param type side information type
3178 * @param size new side information size
3179 * @return 0 on success, < 0 on failure
3181 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3185 * Get side information from packet.
3188 * @param type desired side information type
3189 * @param size pointer for side information size to store (optional)
3190 * @return pointer to data if present or NULL otherwise
3192 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3200 * @addtogroup lavc_decoding
3205 * Find a registered decoder with a matching codec ID.
3207 * @param id AVCodecID of the requested decoder
3208 * @return A decoder if one was found, NULL otherwise.
3210 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3213 * Find a registered decoder with the specified name.
3215 * @param name name of the requested decoder
3216 * @return A decoder if one was found, NULL otherwise.
3218 AVCodec *avcodec_find_decoder_by_name(const char *name);
3220 #if FF_API_GET_BUFFER
3221 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3222 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3223 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3227 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3228 * it can be called by custom get_buffer2() implementations for decoders without
3229 * CODEC_CAP_DR1 set.
3231 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3234 * Return the amount of padding in pixels which the get_buffer callback must
3235 * provide around the edge of the image for codecs which do not have the
3236 * CODEC_FLAG_EMU_EDGE flag.
3238 * @return Required padding in pixels.
3240 unsigned avcodec_get_edge_width(void);
3243 * Modify width and height values so that they will result in a memory
3244 * buffer that is acceptable for the codec if you do not use any horizontal
3247 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3248 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3249 * according to avcodec_get_edge_width() before.
3251 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3254 * Modify width and height values so that they will result in a memory
3255 * buffer that is acceptable for the codec if you also ensure that all
3256 * line sizes are a multiple of the respective linesize_align[i].
3258 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3259 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3260 * according to avcodec_get_edge_width() before.
3262 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3263 int linesize_align[AV_NUM_DATA_POINTERS]);
3266 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3268 * Some decoders may support multiple frames in a single AVPacket. Such
3269 * decoders would then just decode the first frame. In this case,
3270 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3271 * the remaining data in order to decode the second frame, etc...
3272 * Even if no frames are returned, the packet needs to be fed to the decoder
3273 * with remaining data until it is completely consumed or an error occurs.
3275 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3276 * larger than the actual read bytes because some optimized bitstream
3277 * readers read 32 or 64 bits at once and could read over the end.
3279 * @note You might have to align the input buffer. The alignment requirements
3280 * depend on the CPU and the decoder.
3282 * @param avctx the codec context
3283 * @param[out] frame The AVFrame in which to store decoded audio samples.
3284 * Decoders request a buffer of a particular size by setting
3285 * AVFrame.nb_samples prior to calling get_buffer(). The
3286 * decoder may, however, only utilize part of the buffer by
3287 * setting AVFrame.nb_samples to a smaller value in the
3289 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3291 * @param[in] avpkt The input AVPacket containing the input buffer.
3292 * At least avpkt->data and avpkt->size should be set. Some
3293 * decoders might also require additional fields to be set.
3294 * @return A negative error code is returned if an error occurred during
3295 * decoding, otherwise the number of bytes consumed from the input
3296 * AVPacket is returned.
3298 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3299 int *got_frame_ptr, AVPacket *avpkt);
3302 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3303 * Some decoders may support multiple frames in a single AVPacket, such
3304 * decoders would then just decode the first frame.
3306 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3307 * the actual read bytes because some optimized bitstream readers read 32 or 64
3308 * bits at once and could read over the end.
3310 * @warning The end of the input buffer buf should be set to 0 to ensure that
3311 * no overreading happens for damaged MPEG streams.
3313 * @note You might have to align the input buffer avpkt->data.
3314 * The alignment requirements depend on the CPU: on some CPUs it isn't
3315 * necessary at all, on others it won't work at all if not aligned and on others
3316 * it will work but it will have an impact on performance.
3318 * In practice, avpkt->data should have 4 byte alignment at minimum.
3320 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3321 * between input and output, these need to be fed with avpkt->data=NULL,
3322 * avpkt->size=0 at the end to return the remaining frames.
3324 * @param avctx the codec context
3325 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3326 * Use avcodec_alloc_frame to get an AVFrame, the codec will
3327 * allocate memory for the actual bitmap.
3328 * with default get/release_buffer(), the decoder frees/reuses the bitmap as it sees fit.
3329 * with overridden get/release_buffer() (needs CODEC_CAP_DR1) the user decides into what buffer the decoder
3330 * decodes and the decoder tells the user once it does not need the data anymore,
3331 * the user app can at this point free/reuse/keep the memory as it sees fit.
3333 * @param[in] avpkt The input AVpacket containing the input buffer.
3334 * You can create such packet with av_init_packet() and by then setting
3335 * data and size, some decoders might in addition need other fields like
3336 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3338 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3339 * @return On error a negative value is returned, otherwise the number of bytes
3340 * used or zero if no frame could be decompressed.
3342 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3343 int *got_picture_ptr,
3347 * Decode a subtitle message.
3348 * Return a negative value on error, otherwise return the number of bytes used.
3349 * If no subtitle could be decompressed, got_sub_ptr is zero.
3350 * Otherwise, the subtitle is stored in *sub.
3351 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3352 * simplicity, because the performance difference is expect to be negligible
3353 * and reusing a get_buffer written for video codecs would probably perform badly
3354 * due to a potentially very different allocation pattern.
3356 * @param avctx the codec context
3357 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3358 freed with avsubtitle_free if *got_sub_ptr is set.
3359 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3360 * @param[in] avpkt The input AVPacket containing the input buffer.
3362 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3367 * @defgroup lavc_parsing Frame parsing
3371 typedef struct AVCodecParserContext {
3373 struct AVCodecParser *parser;
3374 int64_t frame_offset; /* offset of the current frame */
3375 int64_t cur_offset; /* current offset
3376 (incremented by each av_parser_parse()) */
3377 int64_t next_frame_offset; /* offset of the next frame */
3379 int pict_type; /* XXX: Put it back in AVCodecContext. */
3381 * This field is used for proper frame duration computation in lavf.
3382 * It signals, how much longer the frame duration of the current frame
3383 * is compared to normal frame duration.
3385 * frame_duration = (1 + repeat_pict) * time_base
3387 * It is used by codecs like H.264 to display telecined material.
3389 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3390 int64_t pts; /* pts of the current frame */
3391 int64_t dts; /* dts of the current frame */
3396 int fetch_timestamp;
3398 #define AV_PARSER_PTS_NB 4
3399 int cur_frame_start_index;
3400 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3401 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3402 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3405 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3406 #define PARSER_FLAG_ONCE 0x0002
3407 /// Set if the parser has a valid file offset
3408 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3410 int64_t offset; ///< byte offset from starting packet start
3411 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3414 * Set by parser to 1 for key frames and 0 for non-key frames.
3415 * It is initialized to -1, so if the parser doesn't set this flag,
3416 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3422 * Time difference in stream time base units from the pts of this
3423 * packet to the point at which the output from the decoder has converged
3424 * independent from the availability of previous frames. That is, the
3425 * frames are virtually identical no matter if decoding started from
3426 * the very first frame or from this keyframe.
3427 * Is AV_NOPTS_VALUE if unknown.
3428 * This field is not the display duration of the current frame.
3429 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3432 * The purpose of this field is to allow seeking in streams that have no
3433 * keyframes in the conventional sense. It corresponds to the
3434 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3435 * essential for some types of subtitle streams to ensure that all
3436 * subtitles are correctly displayed after seeking.
3438 int64_t convergence_duration;
3440 // Timestamp generation support:
3442 * Synchronization point for start of timestamp generation.
3444 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3447 * For example, this corresponds to presence of H.264 buffering period
3453 * Offset of the current timestamp against last timestamp sync point in
3454 * units of AVCodecContext.time_base.
3456 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3457 * contain a valid timestamp offset.
3459 * Note that the timestamp of sync point has usually a nonzero
3460 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3461 * the next frame after timestamp sync point will be usually 1.
3463 * For example, this corresponds to H.264 cpb_removal_delay.
3465 int dts_ref_dts_delta;
3468 * Presentation delay of current frame in units of AVCodecContext.time_base.
3470 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3471 * contain valid non-negative timestamp delta (presentation time of a frame
3472 * must not lie in the past).
3474 * This delay represents the difference between decoding and presentation
3475 * time of the frame.
3477 * For example, this corresponds to H.264 dpb_output_delay.
3482 * Position of the packet in file.
3484 * Analogous to cur_frame_pts/dts
3486 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3489 * Byte position of currently parsed frame in stream.
3494 * Previous frame byte position.
3499 * Duration of the current frame.
3500 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3501 * For all other types, this is in units of AVCodecContext.time_base.
3504 } AVCodecParserContext;
3506 typedef struct AVCodecParser {
3507 int codec_ids[5]; /* several codec IDs are permitted */
3509 int (*parser_init)(AVCodecParserContext *s);
3510 int (*parser_parse)(AVCodecParserContext *s,
3511 AVCodecContext *avctx,
3512 const uint8_t **poutbuf, int *poutbuf_size,
3513 const uint8_t *buf, int buf_size);
3514 void (*parser_close)(AVCodecParserContext *s);
3515 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3516 struct AVCodecParser *next;
3519 AVCodecParser *av_parser_next(AVCodecParser *c);
3521 void av_register_codec_parser(AVCodecParser *parser);
3522 AVCodecParserContext *av_parser_init(int codec_id);
3527 * @param s parser context.
3528 * @param avctx codec context.
3529 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3530 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3531 * @param buf input buffer.
3532 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3533 * @param pts input presentation timestamp.
3534 * @param dts input decoding timestamp.
3535 * @param pos input byte position in stream.
3536 * @return the number of bytes of the input bitstream used.
3541 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3548 * decode_frame(data, size);
3552 int av_parser_parse2(AVCodecParserContext *s,
3553 AVCodecContext *avctx,
3554 uint8_t **poutbuf, int *poutbuf_size,
3555 const uint8_t *buf, int buf_size,
3556 int64_t pts, int64_t dts,
3560 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3561 * @deprecated use AVBitstreamFilter
3563 int av_parser_change(AVCodecParserContext *s,
3564 AVCodecContext *avctx,
3565 uint8_t **poutbuf, int *poutbuf_size,
3566 const uint8_t *buf, int buf_size, int keyframe);
3567 void av_parser_close(AVCodecParserContext *s);
3575 * @addtogroup lavc_encoding
3580 * Find a registered encoder with a matching codec ID.
3582 * @param id AVCodecID of the requested encoder
3583 * @return An encoder if one was found, NULL otherwise.
3585 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3588 * Find a registered encoder with the specified name.
3590 * @param name name of the requested encoder
3591 * @return An encoder if one was found, NULL otherwise.
3593 AVCodec *avcodec_find_encoder_by_name(const char *name);
3596 * Encode a frame of audio.
3598 * Takes input samples from frame and writes the next output packet, if
3599 * available, to avpkt. The output packet does not necessarily contain data for
3600 * the most recent frame, as encoders can delay, split, and combine input frames
3601 * internally as needed.
3603 * @param avctx codec context
3604 * @param avpkt output AVPacket.
3605 * The user can supply an output buffer by setting
3606 * avpkt->data and avpkt->size prior to calling the
3607 * function, but if the size of the user-provided data is not
3608 * large enough, encoding will fail. All other AVPacket fields
3609 * will be reset by the encoder using av_init_packet(). If
3610 * avpkt->data is NULL, the encoder will allocate it.
3611 * The encoder will set avpkt->size to the size of the
3614 * If this function fails or produces no output, avpkt will be
3615 * freed using av_free_packet() (i.e. avpkt->destruct will be
3616 * called to free the user supplied buffer).
3617 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3618 * May be NULL when flushing an encoder that has the
3619 * CODEC_CAP_DELAY capability set.
3620 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3621 * can have any number of samples.
3622 * If it is not set, frame->nb_samples must be equal to
3623 * avctx->frame_size for all frames except the last.
3624 * The final frame may be smaller than avctx->frame_size.
3625 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3626 * output packet is non-empty, and to 0 if it is
3627 * empty. If the function returns an error, the
3628 * packet can be assumed to be invalid, and the
3629 * value of got_packet_ptr is undefined and should
3631 * @return 0 on success, negative error code on failure
3633 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3634 const AVFrame *frame, int *got_packet_ptr);
3637 * Encode a frame of video.
3639 * Takes input raw video data from frame and writes the next output packet, if
3640 * available, to avpkt. The output packet does not necessarily contain data for
3641 * the most recent frame, as encoders can delay and reorder input frames
3642 * internally as needed.
3644 * @param avctx codec context
3645 * @param avpkt output AVPacket.
3646 * The user can supply an output buffer by setting
3647 * avpkt->data and avpkt->size prior to calling the
3648 * function, but if the size of the user-provided data is not
3649 * large enough, encoding will fail. All other AVPacket fields
3650 * will be reset by the encoder using av_init_packet(). If
3651 * avpkt->data is NULL, the encoder will allocate it.
3652 * The encoder will set avpkt->size to the size of the
3653 * output packet. The returned data (if any) belongs to the
3654 * caller, he is responsible for freeing it.
3656 * If this function fails or produces no output, avpkt will be
3657 * freed using av_free_packet() (i.e. avpkt->destruct will be
3658 * called to free the user supplied buffer).
3659 * @param[in] frame AVFrame containing the raw video data to be encoded.
3660 * May be NULL when flushing an encoder that has the
3661 * CODEC_CAP_DELAY capability set.
3662 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3663 * output packet is non-empty, and to 0 if it is
3664 * empty. If the function returns an error, the
3665 * packet can be assumed to be invalid, and the
3666 * value of got_packet_ptr is undefined and should
3668 * @return 0 on success, negative error code on failure
3670 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3671 const AVFrame *frame, int *got_packet_ptr);
3673 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3674 const AVSubtitle *sub);
3682 * @addtogroup lavc_picture
3687 * Allocate memory for a picture. Call avpicture_free() to free it.
3689 * @see avpicture_fill()
3691 * @param picture the picture to be filled in
3692 * @param pix_fmt the format of the picture
3693 * @param width the width of the picture
3694 * @param height the height of the picture
3695 * @return zero if successful, a negative value if not
3697 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
3700 * Free a picture previously allocated by avpicture_alloc().
3701 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3704 * @param picture the AVPicture to be freed
3706 void avpicture_free(AVPicture *picture);
3709 * Fill in the AVPicture fields.
3710 * The fields of the given AVPicture are filled in by using the 'ptr' address
3711 * which points to the image data buffer. Depending on the specified picture
3712 * format, one or multiple image data pointers and line sizes will be set.
3713 * If a planar format is specified, several pointers will be set pointing to
3714 * the different picture planes and the line sizes of the different planes
3715 * will be stored in the lines_sizes array.
3716 * Call with ptr == NULL to get the required size for the ptr buffer.
3718 * To allocate the buffer and fill in the AVPicture fields in one call,
3719 * use avpicture_alloc().
3721 * @param picture AVPicture whose fields are to be filled in
3722 * @param ptr Buffer which will contain or contains the actual image data
3723 * @param pix_fmt The format in which the picture data is stored.
3724 * @param width the width of the image in pixels
3725 * @param height the height of the image in pixels
3726 * @return size of the image data in bytes
3728 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3729 enum AVPixelFormat pix_fmt, int width, int height);
3732 * Copy pixel data from an AVPicture into a buffer.
3733 * The data is stored compactly, without any gaps for alignment or padding
3734 * which may be applied by avpicture_fill().
3736 * @see avpicture_get_size()
3738 * @param[in] src AVPicture containing image data
3739 * @param[in] pix_fmt The format in which the picture data is stored.
3740 * @param[in] width the width of the image in pixels.
3741 * @param[in] height the height of the image in pixels.
3742 * @param[out] dest A buffer into which picture data will be copied.
3743 * @param[in] dest_size The size of 'dest'.
3744 * @return The number of bytes written to dest, or a negative value (error code) on error.
3746 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
3747 int width, int height,
3748 unsigned char *dest, int dest_size);
3751 * Calculate the size in bytes that a picture of the given width and height
3752 * would occupy if stored in the given picture format.
3753 * Note that this returns the size of a compact representation as generated
3754 * by avpicture_layout(), which can be smaller than the size required for e.g.
3757 * @param pix_fmt the given picture format
3758 * @param width the width of the image
3759 * @param height the height of the image
3760 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3762 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
3764 #if FF_API_DEINTERLACE
3766 * deinterlace - if not supported return -1
3768 * @deprecated - use yadif (in libavfilter) instead
3770 attribute_deprecated
3771 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3772 enum AVPixelFormat pix_fmt, int width, int height);
3775 * Copy image src to dst. Wraps av_picture_data_copy() above.
3777 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3778 enum AVPixelFormat pix_fmt, int width, int height);
3781 * Crop image top and left side.
3783 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3784 enum AVPixelFormat pix_fmt, int top_band, int left_band);
3789 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
3790 int padtop, int padbottom, int padleft, int padright, int *color);
3797 * @defgroup lavc_misc Utility functions
3800 * Miscellaneous utility functions related to both encoding and decoding
3806 * @defgroup lavc_misc_pixfmt Pixel formats
3808 * Functions for working with pixel formats.
3813 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
3816 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
3819 * Return a value representing the fourCC code associated to the
3820 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3823 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
3825 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3826 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3827 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3828 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3829 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3830 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3833 * Compute what kind of losses will occur when converting from one specific
3834 * pixel format to another.
3835 * When converting from one pixel format to another, information loss may occur.
3836 * For example, when converting from RGB24 to GRAY, the color information will
3837 * be lost. Similarly, other losses occur when converting from some formats to
3838 * other formats. These losses can involve loss of chroma, but also loss of
3839 * resolution, loss of color depth, loss due to the color space conversion, loss
3840 * of the alpha bits or loss due to color quantization.
3841 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3842 * which will occur when converting from one pixel format to another.
3844 * @param[in] dst_pix_fmt destination pixel format
3845 * @param[in] src_pix_fmt source pixel format
3846 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3847 * @return Combination of flags informing you what kind of losses will occur.
3849 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
3853 * Find the best pixel format to convert to given a certain source pixel
3854 * format. When converting from one pixel format to another, information loss
3855 * may occur. For example, when converting from RGB24 to GRAY, the color
3856 * information will be lost. Similarly, other losses occur when converting from
3857 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
3858 * the given pixel formats should be used to suffer the least amount of loss.
3859 * The pixel formats from which it chooses one, are determined by the
3860 * pix_fmt_list parameter.
3863 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
3864 * @param[in] src_pix_fmt source pixel format
3865 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3866 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3867 * @return The best pixel format to convert to or -1 if none was found.
3869 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
3870 enum AVPixelFormat src_pix_fmt,
3871 int has_alpha, int *loss_ptr);
3873 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
3879 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3882 * Put a string representing the codec tag codec_tag in buf.
3884 * @param buf_size size in bytes of buf
3885 * @return the length of the string that would have been generated if
3886 * enough space had been available, excluding the trailing null
3888 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3890 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3893 * Return a name for the specified profile, if available.
3895 * @param codec the codec that is searched for the given profile
3896 * @param profile the profile value for which a name is requested
3897 * @return A name for the profile if found, NULL otherwise.
3899 const char *av_get_profile_name(const AVCodec *codec, int profile);
3901 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3902 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3903 //FIXME func typedef
3906 * Fill audio frame data and linesize.
3907 * AVFrame extended_data channel pointers are allocated if necessary for
3910 * @param frame the AVFrame
3911 * frame->nb_samples must be set prior to calling the
3912 * function. This function fills in frame->data,
3913 * frame->extended_data, frame->linesize[0].
3914 * @param nb_channels channel count
3915 * @param sample_fmt sample format
3916 * @param buf buffer to use for frame data
3917 * @param buf_size size of buffer
3918 * @param align plane size sample alignment (0 = default)
3919 * @return 0 on success, negative error code on failure
3921 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
3922 enum AVSampleFormat sample_fmt, const uint8_t *buf,
3923 int buf_size, int align);
3926 * Flush buffers, should be called when seeking or when switching to a different stream.
3928 void avcodec_flush_buffers(AVCodecContext *avctx);
3931 * Return codec bits per sample.
3933 * @param[in] codec_id the codec
3934 * @return Number of bits per sample or zero if unknown for the given codec.
3936 int av_get_bits_per_sample(enum AVCodecID codec_id);
3939 * Return codec bits per sample.
3940 * Only return non-zero if the bits per sample is exactly correct, not an
3943 * @param[in] codec_id the codec
3944 * @return Number of bits per sample or zero if unknown for the given codec.
3946 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
3949 * Return audio frame duration.
3951 * @param avctx codec context
3952 * @param frame_bytes size of the frame, or 0 if unknown
3953 * @return frame duration, in samples, if known. 0 if not able to
3956 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
3959 typedef struct AVBitStreamFilterContext {
3961 struct AVBitStreamFilter *filter;
3962 AVCodecParserContext *parser;
3963 struct AVBitStreamFilterContext *next;
3964 } AVBitStreamFilterContext;
3967 typedef struct AVBitStreamFilter {
3970 int (*filter)(AVBitStreamFilterContext *bsfc,
3971 AVCodecContext *avctx, const char *args,
3972 uint8_t **poutbuf, int *poutbuf_size,
3973 const uint8_t *buf, int buf_size, int keyframe);
3974 void (*close)(AVBitStreamFilterContext *bsfc);
3975 struct AVBitStreamFilter *next;
3976 } AVBitStreamFilter;
3978 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
3979 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
3980 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
3981 AVCodecContext *avctx, const char *args,
3982 uint8_t **poutbuf, int *poutbuf_size,
3983 const uint8_t *buf, int buf_size, int keyframe);
3984 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
3986 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
3991 * Reallocate the given block if it is not large enough, otherwise do nothing.
3995 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
3998 * Allocate a buffer, reusing the given one if large enough.
4000 * Contrary to av_fast_realloc the current buffer contents might not be
4001 * preserved and on error the old buffer is freed, thus no special
4002 * handling to avoid memleaks is necessary.
4004 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4005 * @param size size of the buffer *ptr points to
4006 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4007 * *size 0 if an error occurred.
4009 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4012 * Allocate a buffer with padding, reusing the given one if large enough.
4014 * Same behaviour av_fast_malloc but the buffer has additional
4015 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4018 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4021 * Encode extradata length to a buffer. Used by xiph codecs.
4023 * @param s buffer to write to; must be at least (v/255+1) bytes long
4024 * @param v size of extradata in bytes
4025 * @return number of bytes written to the buffer.
4027 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4030 * Log a generic warning message about a missing feature. This function is
4031 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4032 * only, and would normally not be used by applications.
4033 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4034 * a pointer to an AVClass struct
4035 * @param[in] feature string containing the name of the missing feature
4036 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4037 * If want_sample is non-zero, additional verbage will be added to the log
4038 * message which tells the user how to report samples to the development
4041 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4044 * Log a generic warning message asking for a sample. This function is
4045 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4046 * only, and would normally not be used by applications.
4047 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4048 * a pointer to an AVClass struct
4049 * @param[in] msg string containing an optional message, or NULL if no message
4051 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4054 * Register the hardware accelerator hwaccel.
4056 void av_register_hwaccel(AVHWAccel *hwaccel);
4059 * If hwaccel is NULL, returns the first registered hardware accelerator,
4060 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4061 * after hwaccel, or NULL if hwaccel is the last one.
4063 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4067 * Lock operation used by lockmgr
4070 AV_LOCK_CREATE, ///< Create a mutex
4071 AV_LOCK_OBTAIN, ///< Lock the mutex
4072 AV_LOCK_RELEASE, ///< Unlock the mutex
4073 AV_LOCK_DESTROY, ///< Free mutex resources
4077 * Register a user provided lock manager supporting the operations
4078 * specified by AVLockOp. mutex points to a (void *) where the
4079 * lockmgr should store/get a pointer to a user allocated mutex. It's
4080 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4082 * @param cb User defined callback. Note: Libav may invoke calls to this
4083 * callback during the call to av_lockmgr_register().
4084 * Thus, the application must be prepared to handle that.
4085 * If cb is set to NULL the lockmgr will be unregistered.
4086 * Also note that during unregistration the previously registered
4087 * lockmgr callback may also be invoked.
4089 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4092 * Get the type of the given codec.
4094 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4097 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4098 * with no corresponding avcodec_close()), 0 otherwise.
4100 int avcodec_is_open(AVCodecContext *s);
4103 * @return a non-zero number if codec is an encoder, zero otherwise
4105 int av_codec_is_encoder(const AVCodec *codec);
4108 * @return a non-zero number if codec is a decoder, zero otherwise
4110 int av_codec_is_decoder(const AVCodec *codec);
4113 * @return descriptor for given codec ID or NULL if no descriptor exists.
4115 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4118 * Iterate over all codec descriptors known to libavcodec.
4120 * @param prev previous descriptor. NULL to get the first descriptor.
4122 * @return next descriptor or NULL after the last descriptor
4124 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4127 * @return codec descriptor with the given name or NULL if no such descriptor
4130 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4136 #endif /* AVCODEC_AVCODEC_H */