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
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/frame.h"
38 #include "libavutil/log.h"
39 #include "libavutil/pixfmt.h"
40 #include "libavutil/rational.h"
44 #if FF_API_FAST_MALLOC
45 // to provide fast_*alloc
46 #include "libavutil/mem.h"
50 * @defgroup libavc Encoding/Decoding Library
53 * @defgroup lavc_decoding Decoding
57 * @defgroup lavc_encoding Encoding
61 * @defgroup lavc_codec Codecs
63 * @defgroup lavc_codec_native Native Codecs
66 * @defgroup lavc_codec_wrappers External library wrappers
69 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
73 * @defgroup lavc_internal Internal
81 * @defgroup lavc_core Core functions/structures.
84 * Basic definitions, functions for querying libavcodec capabilities,
85 * allocating core structures, etc.
91 * Identify the syntax and semantics of the bitstream.
92 * The principle is roughly:
93 * Two decoders with the same ID can decode the same streams.
94 * Two encoders with the same ID can encode compatible streams.
95 * There may be slight deviations from the principle due to implementation
98 * If you add a codec ID to this list, add it so that
99 * 1. no value of a existing codec ID changes (that would break ABI),
100 * 2. it is as close as possible to similar codecs.
102 * After adding new codec IDs, do not forget to add an entry to the codec
103 * descriptor list and bump libavcodec minor version.
109 AV_CODEC_ID_MPEG1VIDEO,
110 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
112 AV_CODEC_ID_MPEG2VIDEO_XVMC,
113 #endif /* FF_API_XVMC */
124 AV_CODEC_ID_RAWVIDEO,
125 AV_CODEC_ID_MSMPEG4V1,
126 AV_CODEC_ID_MSMPEG4V2,
127 AV_CODEC_ID_MSMPEG4V3,
150 AV_CODEC_ID_INTERPLAY_VIDEO,
157 AV_CODEC_ID_MSVIDEO1,
162 AV_CODEC_ID_TRUEMOTION1,
163 AV_CODEC_ID_VMDVIDEO,
188 AV_CODEC_ID_TRUEMOTION2,
194 AV_CODEC_ID_SMACKVIDEO,
199 AV_CODEC_ID_JPEG2000,
205 AV_CODEC_ID_DSICINVIDEO,
206 AV_CODEC_ID_TIERTEXSEQVIDEO,
214 AV_CODEC_ID_BETHSOFTVID,
226 AV_CODEC_ID_ESCAPE124,
230 AV_CODEC_ID_MOTIONPIXELS,
242 AV_CODEC_ID_FLASHSV2,
243 AV_CODEC_ID_CDGRAPHICS,
246 AV_CODEC_ID_BINKVIDEO,
247 AV_CODEC_ID_IFF_ILBM,
248 AV_CODEC_ID_IFF_BYTERUN1,
254 AV_CODEC_ID_A64_MULTI,
255 AV_CODEC_ID_A64_MULTI5,
258 AV_CODEC_ID_LAGARITH,
262 AV_CODEC_ID_WMV3IMAGE,
263 AV_CODEC_ID_VC1IMAGE,
265 AV_CODEC_ID_BMV_VIDEO,
272 AV_CODEC_ID_ZEROCODEC,
281 AV_CODEC_ID_ESCAPE130,
284 AV_CODEC_ID_HNM4_VIDEO,
287 AV_CODEC_ID_ALIAS_PIX,
288 AV_CODEC_ID_BRENDER_PIX,
289 AV_CODEC_ID_PAF_VIDEO,
297 /* various PCM "codecs" */
298 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
299 AV_CODEC_ID_PCM_S16LE = 0x10000,
300 AV_CODEC_ID_PCM_S16BE,
301 AV_CODEC_ID_PCM_U16LE,
302 AV_CODEC_ID_PCM_U16BE,
305 AV_CODEC_ID_PCM_MULAW,
306 AV_CODEC_ID_PCM_ALAW,
307 AV_CODEC_ID_PCM_S32LE,
308 AV_CODEC_ID_PCM_S32BE,
309 AV_CODEC_ID_PCM_U32LE,
310 AV_CODEC_ID_PCM_U32BE,
311 AV_CODEC_ID_PCM_S24LE,
312 AV_CODEC_ID_PCM_S24BE,
313 AV_CODEC_ID_PCM_U24LE,
314 AV_CODEC_ID_PCM_U24BE,
315 AV_CODEC_ID_PCM_S24DAUD,
316 AV_CODEC_ID_PCM_ZORK,
317 AV_CODEC_ID_PCM_S16LE_PLANAR,
319 AV_CODEC_ID_PCM_F32BE,
320 AV_CODEC_ID_PCM_F32LE,
321 AV_CODEC_ID_PCM_F64BE,
322 AV_CODEC_ID_PCM_F64LE,
323 AV_CODEC_ID_PCM_BLURAY,
326 AV_CODEC_ID_PCM_S8_PLANAR,
327 AV_CODEC_ID_PCM_S24LE_PLANAR,
328 AV_CODEC_ID_PCM_S32LE_PLANAR,
330 /* various ADPCM codecs */
331 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
332 AV_CODEC_ID_ADPCM_IMA_WAV,
333 AV_CODEC_ID_ADPCM_IMA_DK3,
334 AV_CODEC_ID_ADPCM_IMA_DK4,
335 AV_CODEC_ID_ADPCM_IMA_WS,
336 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
337 AV_CODEC_ID_ADPCM_MS,
338 AV_CODEC_ID_ADPCM_4XM,
339 AV_CODEC_ID_ADPCM_XA,
340 AV_CODEC_ID_ADPCM_ADX,
341 AV_CODEC_ID_ADPCM_EA,
342 AV_CODEC_ID_ADPCM_G726,
343 AV_CODEC_ID_ADPCM_CT,
344 AV_CODEC_ID_ADPCM_SWF,
345 AV_CODEC_ID_ADPCM_YAMAHA,
346 AV_CODEC_ID_ADPCM_SBPRO_4,
347 AV_CODEC_ID_ADPCM_SBPRO_3,
348 AV_CODEC_ID_ADPCM_SBPRO_2,
349 AV_CODEC_ID_ADPCM_THP,
350 AV_CODEC_ID_ADPCM_IMA_AMV,
351 AV_CODEC_ID_ADPCM_EA_R1,
352 AV_CODEC_ID_ADPCM_EA_R3,
353 AV_CODEC_ID_ADPCM_EA_R2,
354 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
355 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
356 AV_CODEC_ID_ADPCM_EA_XAS,
357 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
358 AV_CODEC_ID_ADPCM_IMA_ISS,
359 AV_CODEC_ID_ADPCM_G722,
360 AV_CODEC_ID_ADPCM_IMA_APC,
361 AV_CODEC_ID_ADPCM_VIMA,
364 AV_CODEC_ID_AMR_NB = 0x12000,
367 /* RealAudio codecs*/
368 AV_CODEC_ID_RA_144 = 0x13000,
371 /* various DPCM codecs */
372 AV_CODEC_ID_ROQ_DPCM = 0x14000,
373 AV_CODEC_ID_INTERPLAY_DPCM,
374 AV_CODEC_ID_XAN_DPCM,
375 AV_CODEC_ID_SOL_DPCM,
378 AV_CODEC_ID_MP2 = 0x15000,
379 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
389 AV_CODEC_ID_VMDAUDIO,
395 AV_CODEC_ID_WESTWOOD_SND1,
396 AV_CODEC_ID_GSM, ///< as in Berlin toast format
399 AV_CODEC_ID_TRUESPEECH,
401 AV_CODEC_ID_SMACKAUDIO,
404 AV_CODEC_ID_DSICINAUDIO,
406 AV_CODEC_ID_MUSEPACK7,
408 AV_CODEC_ID_GSM_MS, /* as found in WAV */
414 AV_CODEC_ID_NELLYMOSER,
415 AV_CODEC_ID_MUSEPACK8,
417 AV_CODEC_ID_WMAVOICE,
419 AV_CODEC_ID_WMALOSSLESS,
428 AV_CODEC_ID_BINKAUDIO_RDFT,
429 AV_CODEC_ID_BINKAUDIO_DCT,
430 AV_CODEC_ID_AAC_LATM,
435 AV_CODEC_ID_8SVX_EXP,
436 AV_CODEC_ID_8SVX_FIB,
437 AV_CODEC_ID_BMV_AUDIO,
442 AV_CODEC_ID_COMFORT_NOISE,
444 AV_CODEC_ID_METASOUND,
445 AV_CODEC_ID_PAF_AUDIO,
448 /* subtitle codecs */
449 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
450 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
451 AV_CODEC_ID_DVB_SUBTITLE,
452 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
455 AV_CODEC_ID_MOV_TEXT,
456 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
457 AV_CODEC_ID_DVB_TELETEXT,
460 /* other specific kind of codecs (generally used for attachments) */
461 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
462 AV_CODEC_ID_TTF = 0x18000,
464 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
466 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
467 * stream (only used by libavformat) */
468 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
469 * stream (only used by libavformat) */
470 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
474 * This struct describes the properties of a single codec described by an
476 * @see avcodec_get_descriptor()
478 typedef struct AVCodecDescriptor {
480 enum AVMediaType type;
482 * Name of the codec described by this descriptor. It is non-empty and
483 * unique for each codec descriptor. It should contain alphanumeric
484 * characters and '_' only.
488 * A more descriptive name for this codec. May be NULL.
490 const char *long_name;
492 * Codec properties, a combination of AV_CODEC_PROP_* flags.
498 * Codec uses only intra compression.
501 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
503 * Codec supports lossy compression. Audio and video codecs only.
504 * @note a codec may support both lossy and lossless
507 #define AV_CODEC_PROP_LOSSY (1 << 1)
509 * Codec supports lossless compression. Audio and video codecs only.
511 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
513 * Codec supports frame reordering. That is, the coded order (the order in which
514 * the encoded packets are output by the encoders / stored / input to the
515 * decoders) may be different from the presentation order of the corresponding
518 * For codecs that do not have this property set, PTS and DTS should always be
521 #define AV_CODEC_PROP_REORDER (1 << 3)
524 * @ingroup lavc_decoding
525 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
526 * This is mainly needed because some optimized bitstream readers read
527 * 32 or 64 bit at once and could read over the end.<br>
528 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
529 * MPEG bitstreams could cause overread and segfault.
531 #define FF_INPUT_BUFFER_PADDING_SIZE 8
534 * @ingroup lavc_encoding
535 * minimum encoding buffer size
536 * Used to avoid some checks during header writing.
538 #define FF_MIN_BUFFER_SIZE 16384
542 * @ingroup lavc_encoding
543 * motion estimation type.
546 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
550 ME_EPZS, ///< enhanced predictive zonal search
551 ME_X1, ///< reserved for experiments
552 ME_HEX, ///< hexagon based search
553 ME_UMH, ///< uneven multi-hexagon search
554 ME_TESA, ///< transformed exhaustive search algorithm
558 * @ingroup lavc_decoding
561 /* We leave some space between them for extensions (drop some
562 * keyframes for intra-only or drop just some bidir frames). */
563 AVDISCARD_NONE =-16, ///< discard nothing
564 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
565 AVDISCARD_NONREF = 8, ///< discard all non reference
566 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
567 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
568 AVDISCARD_ALL = 48, ///< discard all
571 enum AVAudioServiceType {
572 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
573 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
574 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
575 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
576 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
577 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
578 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
579 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
580 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
581 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
585 * @ingroup lavc_encoding
587 typedef struct RcOverride{
590 int qscale; // If this is 0 then quality_factor will be used instead.
591 float quality_factor;
594 #if FF_API_MAX_BFRAMES
596 * @deprecated there is no libavcodec-wide limit on the number of B-frames
598 #define FF_MAX_B_FRAMES 16
602 These flags can be passed in AVCodecContext.flags before initialization.
603 Note: Not everything is supported yet.
607 * Allow decoders to produce frames with data planes that are not aligned
608 * to CPU requirements (e.g. due to cropping).
610 #define CODEC_FLAG_UNALIGNED 0x0001
611 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
612 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
613 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
614 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
617 * @deprecated use the "gmc" private option of the libxvid encoder
619 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
623 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
626 #define CODEC_FLAG_MV0 0x0040
628 #if FF_API_INPUT_PRESERVED
630 * @deprecated passing reference-counted frames to the encoders replaces this
633 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
635 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
636 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
637 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
640 * @deprecated edges are not used/required anymore. I.e. this flag is now always
643 #define CODEC_FLAG_EMU_EDGE 0x4000
645 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
646 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
647 location instead of only at frame boundaries. */
648 #if FF_API_NORMALIZE_AQP
650 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
653 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
655 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
656 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
657 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
658 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
659 /* Fx : Flag for h263+ extra options */
660 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
661 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
662 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
663 #define CODEC_FLAG_CLOSED_GOP 0x80000000
664 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
665 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
666 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
667 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
669 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
671 /* Unsupported options :
672 * Syntax Arithmetic coding (SAC)
673 * Reference Picture Selection
674 * Independent Segment Decoding */
676 /* codec capabilities */
678 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
680 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
681 * If not set, it might not use get_buffer() at all or use operations that
682 * assume the buffer was allocated by avcodec_default_get_buffer.
684 #define CODEC_CAP_DR1 0x0002
685 #define CODEC_CAP_TRUNCATED 0x0008
687 /* Codec can export data for HW decoding (XvMC). */
688 #define CODEC_CAP_HWACCEL 0x0010
689 #endif /* FF_API_XVMC */
691 * Encoder or decoder requires flushing with NULL input at the end in order to
692 * give the complete and correct output.
694 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
695 * with NULL data. The user can still send NULL data to the public encode
696 * or decode function, but libavcodec will not pass it along to the codec
697 * unless this flag is set.
700 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
701 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
705 * The encoder needs to be fed with NULL data at the end of encoding until the
706 * encoder no longer returns data.
708 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
709 * flag also means that the encoder must set the pts and duration for
710 * each output packet. If this flag is not set, the pts and duration will
711 * be determined by libavcodec from the input frame.
713 #define CODEC_CAP_DELAY 0x0020
715 * Codec can be fed a final frame with a smaller size.
716 * This can be used to prevent truncation of the last audio samples.
718 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
721 * Codec can export data for HW decoding (VDPAU).
723 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
726 * Codec can output multiple frames per AVPacket
727 * Normally demuxers return one frame at a time, demuxers which do not do
728 * are connected to a parser to split what they return into proper frames.
729 * This flag is reserved to the very rare category of codecs which have a
730 * bitstream that cannot be split into frames without timeconsuming
731 * operations like full decoding. Demuxers carring such bitstreams thus
732 * may return multiple frames in a packet. This has many disadvantages like
733 * prohibiting stream copy in many cases thus it should only be considered
736 #define CODEC_CAP_SUBFRAMES 0x0100
738 * Codec is experimental and is thus avoided in favor of non experimental
741 #define CODEC_CAP_EXPERIMENTAL 0x0200
743 * Codec should fill in channel configuration and samplerate instead of container
745 #define CODEC_CAP_CHANNEL_CONF 0x0400
746 #if FF_API_NEG_LINESIZES
748 * @deprecated no codecs use this capability
750 #define CODEC_CAP_NEG_LINESIZES 0x0800
753 * Codec supports frame-level multithreading.
755 #define CODEC_CAP_FRAME_THREADS 0x1000
757 * Codec supports slice-based (or partition-based) multithreading.
759 #define CODEC_CAP_SLICE_THREADS 0x2000
761 * Codec supports changed parameters at any point.
763 #define CODEC_CAP_PARAM_CHANGE 0x4000
765 * Codec supports avctx->thread_count == 0 (auto).
767 #define CODEC_CAP_AUTO_THREADS 0x8000
769 * Audio encoder supports receiving a different number of samples in each call.
771 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
774 //The following defines may change, don't expect compatibility if you use them.
775 #define MB_TYPE_INTRA4x4 0x0001
776 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
777 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
778 #define MB_TYPE_16x16 0x0008
779 #define MB_TYPE_16x8 0x0010
780 #define MB_TYPE_8x16 0x0020
781 #define MB_TYPE_8x8 0x0040
782 #define MB_TYPE_INTERLACED 0x0080
783 #define MB_TYPE_DIRECT2 0x0100 //FIXME
784 #define MB_TYPE_ACPRED 0x0200
785 #define MB_TYPE_GMC 0x0400
786 #define MB_TYPE_SKIP 0x0800
787 #define MB_TYPE_P0L0 0x1000
788 #define MB_TYPE_P1L0 0x2000
789 #define MB_TYPE_P0L1 0x4000
790 #define MB_TYPE_P1L1 0x8000
791 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
792 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
793 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
794 #define MB_TYPE_QUANT 0x00010000
795 #define MB_TYPE_CBP 0x00020000
796 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
801 * This specifies the area which should be displayed.
802 * Note there may be multiple such areas for one frame.
804 typedef struct AVPanScan{
807 * - encoding: Set by user.
808 * - decoding: Set by libavcodec.
813 * width and height in 1/16 pel
814 * - encoding: Set by user.
815 * - decoding: Set by libavcodec.
821 * position of the top left corner in 1/16 pel for up to 3 fields/frames
822 * - encoding: Set by user.
823 * - decoding: Set by libavcodec.
825 int16_t position[3][2];
828 #if FF_API_QSCALE_TYPE
829 #define FF_QSCALE_TYPE_MPEG1 0
830 #define FF_QSCALE_TYPE_MPEG2 1
831 #define FF_QSCALE_TYPE_H264 2
832 #define FF_QSCALE_TYPE_VP56 3
835 #if FF_API_GET_BUFFER
836 #define FF_BUFFER_TYPE_INTERNAL 1
837 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
838 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
839 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
841 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
842 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
843 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
844 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
848 * The decoder will keep a reference to the frame and may reuse it later.
850 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
853 * @defgroup lavc_packet AVPacket
855 * Types and functions for working with AVPacket.
858 enum AVPacketSideDataType {
860 AV_PKT_DATA_NEW_EXTRADATA,
863 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
866 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
867 * s32le channel_count
868 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
869 * u64le channel_layout
870 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
872 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
877 AV_PKT_DATA_PARAM_CHANGE,
880 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
881 * structures with info about macroblocks relevant to splitting the
882 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
883 * That is, it does not necessarily contain info about all macroblocks,
884 * as long as the distance between macroblocks in the info is smaller
885 * than the target payload size.
886 * Each MB info structure is 12 bytes, and is laid out as follows:
888 * u32le bit offset from the start of the packet
889 * u8 current quantizer at the start of the macroblock
891 * u16le macroblock address within the GOB
892 * u8 horizontal MV predictor
893 * u8 vertical MV predictor
894 * u8 horizontal MV predictor for block number 3
895 * u8 vertical MV predictor for block number 3
898 AV_PKT_DATA_H263_MB_INFO,
901 * This side data should be associated with an audio stream and contains
902 * ReplayGain information in form of the AVReplayGain struct.
904 AV_PKT_DATA_REPLAYGAIN,
907 * This side data contains a 3x3 transformation matrix describing an affine
908 * transformation that needs to be applied to the decoded video frames for
909 * correct presentation.
911 * See libavutil/display.h for a detailed description of the data.
913 AV_PKT_DATA_DISPLAYMATRIX,
916 typedef struct AVPacketSideData {
919 enum AVPacketSideDataType type;
923 * This structure stores compressed data. It is typically exported by demuxers
924 * and then passed as input to decoders, or received as output from encoders and
925 * then passed to muxers.
927 * For video, it should typically contain one compressed frame. For audio it may
928 * contain several compressed frames.
930 * AVPacket is one of the few structs in Libav, whose size is a part of public
931 * ABI. Thus it may be allocated on stack and no new fields can be added to it
932 * without libavcodec and libavformat major bump.
934 * The semantics of data ownership depends on the buf or destruct (deprecated)
935 * fields. If either is set, the packet data is dynamically allocated and is
936 * valid indefinitely until av_free_packet() is called (which in turn calls
937 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
938 * the packet data is typically backed by some static buffer somewhere and is
939 * only valid for a limited time (e.g. until the next read call when demuxing).
941 * The side data is always allocated with av_malloc() and is freed in
944 typedef struct AVPacket {
946 * A reference to the reference-counted buffer where the packet data is
948 * May be NULL, then the packet data is not reference-counted.
952 * Presentation timestamp in AVStream->time_base units; the time at which
953 * the decompressed packet will be presented to the user.
954 * Can be AV_NOPTS_VALUE if it is not stored in the file.
955 * pts MUST be larger or equal to dts as presentation cannot happen before
956 * decompression, unless one wants to view hex dumps. Some formats misuse
957 * the terms dts and pts/cts to mean something different. Such timestamps
958 * must be converted to true pts/dts before they are stored in AVPacket.
962 * Decompression timestamp in AVStream->time_base units; the time at which
963 * the packet is decompressed.
964 * Can be AV_NOPTS_VALUE if it is not stored in the file.
971 * A combination of AV_PKT_FLAG values
975 * Additional packet data that can be provided by the container.
976 * Packet can contain several types of side information.
978 AVPacketSideData *side_data;
982 * Duration of this packet in AVStream->time_base units, 0 if unknown.
983 * Equals next_pts - this_pts in presentation order.
986 #if FF_API_DESTRUCT_PACKET
988 void (*destruct)(struct AVPacket *);
992 int64_t pos; ///< byte position in stream, -1 if unknown
995 * Time difference in AVStream->time_base units from the pts of this
996 * packet to the point at which the output from the decoder has converged
997 * independent from the availability of previous frames. That is, the
998 * frames are virtually identical no matter if decoding started from
999 * the very first frame or from this keyframe.
1000 * Is AV_NOPTS_VALUE if unknown.
1001 * This field is not the display duration of the current packet.
1002 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1005 * The purpose of this field is to allow seeking in streams that have no
1006 * keyframes in the conventional sense. It corresponds to the
1007 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1008 * essential for some types of subtitle streams to ensure that all
1009 * subtitles are correctly displayed after seeking.
1011 int64_t convergence_duration;
1013 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1014 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1016 enum AVSideDataParamChangeFlags {
1017 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1018 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1019 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1020 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1026 struct AVCodecInternal;
1030 AV_FIELD_PROGRESSIVE,
1031 AV_FIELD_TT, //< Top coded_first, top displayed first
1032 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1033 AV_FIELD_TB, //< Top coded first, bottom displayed first
1034 AV_FIELD_BT, //< Bottom coded first, top displayed first
1038 * main external API structure.
1039 * New fields can be added to the end with minor version bumps.
1040 * Removal, reordering and changes to existing fields require a major
1042 * sizeof(AVCodecContext) must not be used outside libav*.
1044 typedef struct AVCodecContext {
1046 * information on struct for av_log
1047 * - set by avcodec_alloc_context3
1049 const AVClass *av_class;
1050 int log_level_offset;
1052 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1053 const struct AVCodec *codec;
1054 #if FF_API_CODEC_NAME
1056 * @deprecated this field is not used for anything in libavcodec
1058 attribute_deprecated
1059 char codec_name[32];
1061 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1064 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1065 * This is used to work around some encoder bugs.
1066 * A demuxer should set this to what is stored in the field used to identify the codec.
1067 * If there are multiple such fields in a container then the demuxer should choose the one
1068 * which maximizes the information about the used codec.
1069 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1070 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1071 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1073 * - encoding: Set by user, if not then the default based on codec_id will be used.
1074 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1076 unsigned int codec_tag;
1079 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1080 * This is used to work around some encoder bugs.
1081 * - encoding: unused
1082 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1084 unsigned int stream_codec_tag;
1089 * Private context used for internal data.
1091 * Unlike priv_data, this is not codec-specific. It is used in general
1092 * libavcodec functions.
1094 struct AVCodecInternal *internal;
1097 * Private data of the user, can be used to carry app specific stuff.
1098 * - encoding: Set by user.
1099 * - decoding: Set by user.
1104 * the average bitrate
1105 * - encoding: Set by user; unused for constant quantizer encoding.
1106 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1111 * number of bits the bitstream is allowed to diverge from the reference.
1112 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1113 * - encoding: Set by user; unused for constant quantizer encoding.
1114 * - decoding: unused
1116 int bit_rate_tolerance;
1119 * Global quality for codecs which cannot change it per frame.
1120 * This should be proportional to MPEG-1/2/4 qscale.
1121 * - encoding: Set by user.
1122 * - decoding: unused
1127 * - encoding: Set by user.
1128 * - decoding: unused
1130 int compression_level;
1131 #define FF_COMPRESSION_DEFAULT -1
1135 * - encoding: Set by user.
1136 * - decoding: Set by user.
1142 * - encoding: Set by user.
1143 * - decoding: Set by user.
1148 * some codecs need / can use extradata like Huffman tables.
1149 * mjpeg: Huffman tables
1150 * rv10: additional flags
1151 * mpeg4: global headers (they can be in the bitstream or here)
1152 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1153 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1154 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1155 * - encoding: Set/allocated/freed by libavcodec.
1156 * - decoding: Set/allocated/freed by user.
1162 * This is the fundamental unit of time (in seconds) in terms
1163 * of which frame timestamps are represented. For fixed-fps content,
1164 * timebase should be 1/framerate and timestamp increments should be
1166 * - encoding: MUST be set by user.
1167 * - decoding: Set by libavcodec.
1169 AVRational time_base;
1172 * For some codecs, the time base is closer to the field rate than the frame rate.
1173 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1174 * if no telecine is used ...
1176 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1178 int ticks_per_frame;
1184 * Number of frames the decoded output will be delayed relative to the
1188 * For encoding, this is the number of "priming" samples added by the
1189 * encoder to the beginning of the stream. The decoded output will be
1190 * delayed by this many samples relative to the input to the encoder (or
1191 * more, if the decoder adds its own padding).
1192 * The timestamps on the output packets are adjusted by the encoder so
1193 * that they always refer to the first sample of the data actually
1194 * contained in the packet, including any added padding.
1195 * E.g. if the timebase is 1/samplerate and the timestamp of the first
1196 * input sample is 0, the timestamp of the first output packet will be
1199 * For decoding, this is the number of samples the decoder needs to
1200 * output before the decoder's output is valid. When seeking, you should
1201 * start decoding this many samples prior to your desired seek point.
1203 * - encoding: Set by libavcodec.
1204 * - decoding: Set by libavcodec.
1211 * picture width / height.
1212 * - encoding: MUST be set by user.
1213 * - decoding: May be set by the user before opening the decoder if known e.g.
1214 * from the container. Some decoders will require the dimensions
1215 * to be set by the caller. During decoding, the decoder may
1216 * overwrite those values as required.
1221 * Bitstream width / height, may be different from width/height e.g. when
1222 * the decoded frame is cropped before being output.
1223 * - encoding: unused
1224 * - decoding: May be set by the user before opening the decoder if known
1225 * e.g. from the container. During decoding, the decoder may
1226 * overwrite those values as required.
1228 int coded_width, coded_height;
1230 #if FF_API_ASPECT_EXTENDED
1231 #define FF_ASPECT_EXTENDED 15
1235 * the number of pictures in a group of pictures, or 0 for intra_only
1236 * - encoding: Set by user.
1237 * - decoding: unused
1242 * Pixel format, see AV_PIX_FMT_xxx.
1243 * May be set by the demuxer if known from headers.
1244 * May be overriden by the decoder if it knows better.
1245 * - encoding: Set by user.
1246 * - decoding: Set by user if known, overridden by libavcodec if known
1248 enum AVPixelFormat pix_fmt;
1251 * Motion estimation algorithm used for video coding.
1252 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1253 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1254 * - encoding: MUST be set by user.
1255 * - decoding: unused
1260 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1261 * decoder to draw a horizontal band. It improves cache usage. Not
1262 * all codecs can do that. You must check the codec capabilities
1264 * When multithreading is used, it may be called from multiple threads
1265 * at the same time; threads might draw different parts of the same AVFrame,
1266 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1268 * The function is also used by hardware acceleration APIs.
1269 * It is called at least once during frame decoding to pass
1270 * the data needed for hardware render.
1271 * In that mode instead of pixel data, AVFrame points to
1272 * a structure specific to the acceleration API. The application
1273 * reads the structure and can change some fields to indicate progress
1275 * - encoding: unused
1276 * - decoding: Set by user.
1277 * @param height the height of the slice
1278 * @param y the y position of the slice
1279 * @param type 1->top field, 2->bottom field, 3->frame
1280 * @param offset offset into the AVFrame.data from which the slice should be read
1282 void (*draw_horiz_band)(struct AVCodecContext *s,
1283 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1284 int y, int type, int height);
1287 * callback to negotiate the pixelFormat
1288 * @param fmt is the list of formats which are supported by the codec,
1289 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1290 * The first is always the native one.
1291 * @return the chosen format
1292 * - encoding: unused
1293 * - decoding: Set by user, if not set the native format will be chosen.
1295 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1298 * maximum number of B-frames between non-B-frames
1299 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1300 * - encoding: Set by user.
1301 * - decoding: unused
1306 * qscale factor between IP and B-frames
1307 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1308 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1309 * - encoding: Set by user.
1310 * - decoding: unused
1312 float b_quant_factor;
1314 /** obsolete FIXME remove */
1316 #define FF_RC_STRATEGY_XVID 1
1318 int b_frame_strategy;
1321 * qscale offset between IP and B-frames
1322 * - encoding: Set by user.
1323 * - decoding: unused
1325 float b_quant_offset;
1328 * Size of the frame reordering buffer in the decoder.
1329 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1330 * - encoding: Set by libavcodec.
1331 * - decoding: Set by libavcodec.
1336 * 0-> h263 quant 1-> mpeg quant
1337 * - encoding: Set by user.
1338 * - decoding: unused
1343 * qscale factor between P and I-frames
1344 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1345 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1346 * - encoding: Set by user.
1347 * - decoding: unused
1349 float i_quant_factor;
1352 * qscale offset between P and I-frames
1353 * - encoding: Set by user.
1354 * - decoding: unused
1356 float i_quant_offset;
1359 * luminance masking (0-> disabled)
1360 * - encoding: Set by user.
1361 * - decoding: unused
1366 * temporary complexity masking (0-> disabled)
1367 * - encoding: Set by user.
1368 * - decoding: unused
1370 float temporal_cplx_masking;
1373 * spatial complexity masking (0-> disabled)
1374 * - encoding: Set by user.
1375 * - decoding: unused
1377 float spatial_cplx_masking;
1380 * p block masking (0-> disabled)
1381 * - encoding: Set by user.
1382 * - decoding: unused
1387 * darkness masking (0-> disabled)
1388 * - encoding: Set by user.
1389 * - decoding: unused
1395 * - encoding: Set by libavcodec.
1396 * - decoding: Set by user (or 0).
1400 * prediction method (needed for huffyuv)
1401 * - encoding: Set by user.
1402 * - decoding: unused
1404 int prediction_method;
1405 #define FF_PRED_LEFT 0
1406 #define FF_PRED_PLANE 1
1407 #define FF_PRED_MEDIAN 2
1410 * slice offsets in the frame in bytes
1411 * - encoding: Set/allocated by libavcodec.
1412 * - decoding: Set/allocated by user (or NULL).
1417 * sample aspect ratio (0 if unknown)
1418 * That is the width of a pixel divided by the height of the pixel.
1419 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1420 * - encoding: Set by user.
1421 * - decoding: Set by libavcodec.
1423 AVRational sample_aspect_ratio;
1426 * motion estimation comparison function
1427 * - encoding: Set by user.
1428 * - decoding: unused
1432 * subpixel motion estimation comparison function
1433 * - encoding: Set by user.
1434 * - decoding: unused
1438 * macroblock comparison function (not supported yet)
1439 * - encoding: Set by user.
1440 * - decoding: unused
1444 * interlaced DCT comparison function
1445 * - encoding: Set by user.
1446 * - decoding: unused
1449 #define FF_CMP_SAD 0
1450 #define FF_CMP_SSE 1
1451 #define FF_CMP_SATD 2
1452 #define FF_CMP_DCT 3
1453 #define FF_CMP_PSNR 4
1454 #define FF_CMP_BIT 5
1456 #define FF_CMP_ZERO 7
1457 #define FF_CMP_VSAD 8
1458 #define FF_CMP_VSSE 9
1459 #define FF_CMP_NSSE 10
1460 #define FF_CMP_DCTMAX 13
1461 #define FF_CMP_DCT264 14
1462 #define FF_CMP_CHROMA 256
1465 * ME diamond size & shape
1466 * - encoding: Set by user.
1467 * - decoding: unused
1472 * amount of previous MV predictors (2a+1 x 2a+1 square)
1473 * - encoding: Set by user.
1474 * - decoding: unused
1476 int last_predictor_count;
1479 * prepass for motion estimation
1480 * - encoding: Set by user.
1481 * - decoding: unused
1486 * motion estimation prepass comparison function
1487 * - encoding: Set by user.
1488 * - decoding: unused
1493 * ME prepass diamond size & shape
1494 * - encoding: Set by user.
1495 * - decoding: unused
1501 * - encoding: Set by user.
1502 * - decoding: unused
1504 int me_subpel_quality;
1508 * DTG active format information (additional aspect ratio
1509 * information only used in DVB MPEG-2 transport streams)
1512 * - encoding: unused
1513 * - decoding: Set by decoder.
1514 * @deprecated Deprecated in favor of AVSideData
1516 attribute_deprecated int dtg_active_format;
1517 #define FF_DTG_AFD_SAME 8
1518 #define FF_DTG_AFD_4_3 9
1519 #define FF_DTG_AFD_16_9 10
1520 #define FF_DTG_AFD_14_9 11
1521 #define FF_DTG_AFD_4_3_SP_14_9 13
1522 #define FF_DTG_AFD_16_9_SP_14_9 14
1523 #define FF_DTG_AFD_SP_4_3 15
1524 #endif /* FF_API_AFD */
1527 * maximum motion estimation search range in subpel units
1528 * If 0 then no limit.
1530 * - encoding: Set by user.
1531 * - decoding: unused
1536 * intra quantizer bias
1537 * - encoding: Set by user.
1538 * - decoding: unused
1540 int intra_quant_bias;
1541 #define FF_DEFAULT_QUANT_BIAS 999999
1544 * inter quantizer bias
1545 * - encoding: Set by user.
1546 * - decoding: unused
1548 int inter_quant_bias;
1552 * - encoding: unused
1553 * - decoding: Set by user.
1556 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1557 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1558 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1562 * XVideo Motion Acceleration
1563 * - encoding: forbidden
1564 * - decoding: set by decoder
1565 * @deprecated XvMC support is slated for removal.
1567 attribute_deprecated int xvmc_acceleration;
1568 #endif /* FF_API_XVMC */
1571 * macroblock decision mode
1572 * - encoding: Set by user.
1573 * - decoding: unused
1576 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1577 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1578 #define FF_MB_DECISION_RD 2 ///< rate distortion
1581 * custom intra quantization matrix
1582 * - encoding: Set by user, can be NULL.
1583 * - decoding: Set by libavcodec.
1585 uint16_t *intra_matrix;
1588 * custom inter quantization matrix
1589 * - encoding: Set by user, can be NULL.
1590 * - decoding: Set by libavcodec.
1592 uint16_t *inter_matrix;
1595 * scene change detection threshold
1596 * 0 is default, larger means fewer detected scene changes.
1597 * - encoding: Set by user.
1598 * - decoding: unused
1600 int scenechange_threshold;
1603 * noise reduction strength
1604 * - encoding: Set by user.
1605 * - decoding: unused
1607 int noise_reduction;
1610 * Motion estimation threshold below which no motion estimation is
1611 * performed, but instead the user specified motion vectors are used.
1613 * - encoding: Set by user.
1614 * - decoding: unused
1619 * Macroblock threshold below which the user specified macroblock types will be used.
1620 * - encoding: Set by user.
1621 * - decoding: unused
1626 * precision of the intra DC coefficient - 8
1627 * - encoding: Set by user.
1628 * - decoding: unused
1630 int intra_dc_precision;
1633 * Number of macroblock rows at the top which are skipped.
1634 * - encoding: unused
1635 * - decoding: Set by user.
1640 * Number of macroblock rows at the bottom which are skipped.
1641 * - encoding: unused
1642 * - decoding: Set by user.
1647 * Border processing masking, raises the quantizer for mbs on the borders
1649 * - encoding: Set by user.
1650 * - decoding: unused
1652 float border_masking;
1655 * minimum MB lagrange multipler
1656 * - encoding: Set by user.
1657 * - decoding: unused
1662 * maximum MB lagrange multipler
1663 * - encoding: Set by user.
1664 * - decoding: unused
1670 * - encoding: Set by user.
1671 * - decoding: unused
1673 int me_penalty_compensation;
1677 * - encoding: Set by user.
1678 * - decoding: unused
1684 * - encoding: Set by user.
1685 * - decoding: unused
1691 * - encoding: Set by user.
1692 * - decoding: unused
1697 * number of reference frames
1698 * - encoding: Set by user.
1699 * - decoding: Set by lavc.
1704 * chroma qp offset from luma
1705 * - encoding: Set by user.
1706 * - decoding: unused
1710 #if FF_API_UNUSED_MEMBERS
1712 * Multiplied by qscale for each frame and added to scene_change_score.
1713 * - encoding: Set by user.
1714 * - decoding: unused
1716 attribute_deprecated int scenechange_factor;
1721 * Note: Value depends upon the compare function used for fullpel ME.
1722 * - encoding: Set by user.
1723 * - decoding: unused
1728 * Adjust sensitivity of b_frame_strategy 1.
1729 * - encoding: Set by user.
1730 * - decoding: unused
1735 * Chromaticity coordinates of the source primaries.
1736 * - encoding: Set by user
1737 * - decoding: Set by libavcodec
1739 enum AVColorPrimaries color_primaries;
1742 * Color Transfer Characteristic.
1743 * - encoding: Set by user
1744 * - decoding: Set by libavcodec
1746 enum AVColorTransferCharacteristic color_trc;
1749 * YUV colorspace type.
1750 * - encoding: Set by user
1751 * - decoding: Set by libavcodec
1753 enum AVColorSpace colorspace;
1756 * MPEG vs JPEG YUV range.
1757 * - encoding: Set by user
1758 * - decoding: Set by libavcodec
1760 enum AVColorRange color_range;
1763 * This defines the location of chroma samples.
1764 * - encoding: Set by user
1765 * - decoding: Set by libavcodec
1767 enum AVChromaLocation chroma_sample_location;
1771 * Indicates number of picture subdivisions. Used for parallelized
1773 * - encoding: Set by user
1774 * - decoding: unused
1779 * - encoding: set by libavcodec
1780 * - decoding: Set by libavcodec
1782 enum AVFieldOrder field_order;
1785 int sample_rate; ///< samples per second
1786 int channels; ///< number of audio channels
1789 * audio sample format
1790 * - encoding: Set by user.
1791 * - decoding: Set by libavcodec.
1793 enum AVSampleFormat sample_fmt; ///< sample format
1795 /* The following data should not be initialized. */
1797 * Number of samples per channel in an audio frame.
1799 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1800 * except the last must contain exactly frame_size samples per channel.
1801 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1802 * frame size is not restricted.
1803 * - decoding: may be set by some decoders to indicate constant frame size
1808 * Frame counter, set by libavcodec.
1810 * - decoding: total number of frames returned from the decoder so far.
1811 * - encoding: total number of frames passed to the encoder so far.
1813 * @note the counter is not incremented if encoding/decoding resulted in
1819 * number of bytes per packet if constant and known or 0
1820 * Used by some WAV based audio codecs.
1825 * Audio cutoff bandwidth (0 means "automatic")
1826 * - encoding: Set by user.
1827 * - decoding: unused
1831 #if FF_API_REQUEST_CHANNELS
1833 * Decoder should decode to this many channels if it can (0 for default)
1834 * - encoding: unused
1835 * - decoding: Set by user.
1836 * @deprecated Deprecated in favor of request_channel_layout.
1838 attribute_deprecated int request_channels;
1842 * Audio channel layout.
1843 * - encoding: set by user.
1844 * - decoding: set by libavcodec.
1846 uint64_t channel_layout;
1849 * Request decoder to use this channel layout if it can (0 for default)
1850 * - encoding: unused
1851 * - decoding: Set by user.
1853 uint64_t request_channel_layout;
1856 * Type of service that the audio stream conveys.
1857 * - encoding: Set by user.
1858 * - decoding: Set by libavcodec.
1860 enum AVAudioServiceType audio_service_type;
1863 * Used to request a sample format from the decoder.
1864 * - encoding: unused.
1865 * - decoding: Set by user.
1867 enum AVSampleFormat request_sample_fmt;
1869 #if FF_API_GET_BUFFER
1871 * Called at the beginning of each frame to get a buffer for it.
1873 * The function will set AVFrame.data[], AVFrame.linesize[].
1874 * AVFrame.extended_data[] must also be set, but it should be the same as
1875 * AVFrame.data[] except for planar audio with more channels than can fit
1876 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1877 * many data pointers as it can hold.
1879 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1880 * avcodec_default_get_buffer() instead of providing buffers allocated by
1883 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1884 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1885 * but if get_buffer() is overridden then alignment considerations should
1886 * be taken into account.
1888 * @see avcodec_default_get_buffer()
1892 * If pic.reference is set then the frame will be read later by libavcodec.
1893 * avcodec_align_dimensions2() should be used to find the required width and
1894 * height, as they normally need to be rounded up to the next multiple of 16.
1896 * If frame multithreading is used and thread_safe_callbacks is set,
1897 * it may be called from a different thread, but not from more than one at
1898 * once. Does not need to be reentrant.
1900 * @see release_buffer(), reget_buffer()
1901 * @see avcodec_align_dimensions2()
1905 * Decoders request a buffer of a particular size by setting
1906 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1907 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1908 * to a smaller value in the output frame.
1910 * Decoders cannot use the buffer after returning from
1911 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1912 * is assumed to be released immediately upon return. In some rare cases,
1913 * a decoder may need to call get_buffer() more than once in a single
1914 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1915 * called again after it has already been called once, the previously
1916 * acquired buffer is assumed to be released at that time and may not be
1917 * reused by the decoder.
1919 * As a convenience, av_samples_get_buffer_size() and
1920 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1921 * functions to find the required data size and to fill data pointers and
1922 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1923 * since all planes must be the same size.
1925 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1927 * - encoding: unused
1928 * - decoding: Set by libavcodec, user can override.
1930 * @deprecated use get_buffer2()
1932 attribute_deprecated
1933 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1936 * Called to release buffers which were allocated with get_buffer.
1937 * A released buffer can be reused in get_buffer().
1938 * pic.data[*] must be set to NULL.
1939 * May be called from a different thread if frame multithreading is used,
1940 * but not by more than one thread at once, so does not need to be reentrant.
1941 * - encoding: unused
1942 * - decoding: Set by libavcodec, user can override.
1944 * @deprecated custom freeing callbacks should be set from get_buffer2()
1946 attribute_deprecated
1947 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1950 * Called at the beginning of a frame to get cr buffer for it.
1951 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1952 * libavcodec will pass previous buffer in pic, function should return
1953 * same buffer or new buffer with old frame "painted" into it.
1954 * If pic.data[0] == NULL must behave like get_buffer().
1955 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1956 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1958 * - encoding: unused
1959 * - decoding: Set by libavcodec, user can override.
1961 attribute_deprecated
1962 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1966 * This callback is called at the beginning of each frame to get data
1967 * buffer(s) for it. There may be one contiguous buffer for all the data or
1968 * there may be a buffer per each data plane or anything in between. What
1969 * this means is, you may set however many entries in buf[] you feel necessary.
1970 * Each buffer must be reference-counted using the AVBuffer API (see description
1973 * The following fields will be set in the frame before this callback is
1976 * - width, height (video only)
1977 * - sample_rate, channel_layout, nb_samples (audio only)
1978 * Their values may differ from the corresponding values in
1979 * AVCodecContext. This callback must use the frame values, not the codec
1980 * context values, to calculate the required buffer size.
1982 * This callback must fill the following fields in the frame:
1986 * * if the data is planar audio with more than 8 channels, then this
1987 * callback must allocate and fill extended_data to contain all pointers
1988 * to all data planes. data[] must hold as many pointers as it can.
1989 * extended_data must be allocated with av_malloc() and will be freed in
1991 * * otherwise exended_data must point to data
1992 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1993 * the frame's data and extended_data pointers must be contained in these. That
1994 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1995 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1996 * and av_buffer_ref().
1997 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1998 * this callback and filled with the extra buffers if there are more
1999 * buffers than buf[] can hold. extended_buf will be freed in
2002 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2003 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2006 * Each data plane must be aligned to the maximum required by the target
2009 * @see avcodec_default_get_buffer2()
2013 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2014 * (read and/or written to if it is writable) later by libavcodec.
2016 * avcodec_align_dimensions2() should be used to find the required width and
2017 * height, as they normally need to be rounded up to the next multiple of 16.
2019 * If frame multithreading is used and thread_safe_callbacks is set,
2020 * this callback may be called from a different thread, but not from more
2021 * than one at once. Does not need to be reentrant.
2023 * @see avcodec_align_dimensions2()
2027 * Decoders request a buffer of a particular size by setting
2028 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2029 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2030 * to a smaller value in the output frame.
2032 * As a convenience, av_samples_get_buffer_size() and
2033 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2034 * functions to find the required data size and to fill data pointers and
2035 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2036 * since all planes must be the same size.
2038 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2040 * - encoding: unused
2041 * - decoding: Set by libavcodec, user can override.
2043 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2046 * If non-zero, the decoded audio and video frames returned from
2047 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2048 * and are valid indefinitely. The caller must free them with
2049 * av_frame_unref() when they are not needed anymore.
2050 * Otherwise, the decoded frames must not be freed by the caller and are
2051 * only valid until the next decode call.
2053 * - encoding: unused
2054 * - decoding: set by the caller before avcodec_open2().
2056 int refcounted_frames;
2058 /* - encoding parameters */
2059 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2060 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2064 * - encoding: Set by user.
2065 * - decoding: unused
2071 * - encoding: Set by user.
2072 * - decoding: unused
2077 * maximum quantizer difference between frames
2078 * - encoding: Set by user.
2079 * - decoding: unused
2084 * ratecontrol qmin qmax limiting method
2085 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2086 * - encoding: Set by user.
2087 * - decoding: unused
2095 * decoder bitstream buffer size
2096 * - encoding: Set by user.
2097 * - decoding: unused
2102 * ratecontrol override, see RcOverride
2103 * - encoding: Allocated/set/freed by user.
2104 * - decoding: unused
2106 int rc_override_count;
2107 RcOverride *rc_override;
2110 * rate control equation
2111 * - encoding: Set by user
2112 * - decoding: unused
2118 * - encoding: Set by user.
2119 * - decoding: unused
2125 * - encoding: Set by user.
2126 * - decoding: unused
2130 float rc_buffer_aggressivity;
2133 * initial complexity for pass1 ratecontrol
2134 * - encoding: Set by user.
2135 * - decoding: unused
2137 float rc_initial_cplx;
2140 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2141 * - encoding: Set by user.
2142 * - decoding: unused.
2144 float rc_max_available_vbv_use;
2147 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2148 * - encoding: Set by user.
2149 * - decoding: unused.
2151 float rc_min_vbv_overflow_use;
2154 * Number of bits which should be loaded into the rc buffer before decoding starts.
2155 * - encoding: Set by user.
2156 * - decoding: unused
2158 int rc_initial_buffer_occupancy;
2160 #define FF_CODER_TYPE_VLC 0
2161 #define FF_CODER_TYPE_AC 1
2162 #define FF_CODER_TYPE_RAW 2
2163 #define FF_CODER_TYPE_RLE 3
2164 #if FF_API_UNUSED_MEMBERS
2165 #define FF_CODER_TYPE_DEFLATE 4
2166 #endif /* FF_API_UNUSED_MEMBERS */
2169 * - encoding: Set by user.
2170 * - decoding: unused
2176 * - encoding: Set by user.
2177 * - decoding: unused
2182 * minimum Lagrange multipler
2183 * - encoding: Set by user.
2184 * - decoding: unused
2189 * maximum Lagrange multipler
2190 * - encoding: Set by user.
2191 * - decoding: unused
2196 * frame skip threshold
2197 * - encoding: Set by user.
2198 * - decoding: unused
2200 int frame_skip_threshold;
2204 * - encoding: Set by user.
2205 * - decoding: unused
2207 int frame_skip_factor;
2210 * frame skip exponent
2211 * - encoding: Set by user.
2212 * - decoding: unused
2217 * frame skip comparison function
2218 * - encoding: Set by user.
2219 * - decoding: unused
2224 * trellis RD quantization
2225 * - encoding: Set by user.
2226 * - decoding: unused
2231 * - encoding: Set by user.
2232 * - decoding: unused
2234 int min_prediction_order;
2237 * - encoding: Set by user.
2238 * - decoding: unused
2240 int max_prediction_order;
2243 * GOP timecode frame start number, in non drop frame format
2244 * - encoding: Set by user.
2245 * - decoding: unused
2247 int64_t timecode_frame_start;
2249 /* The RTP callback: This function is called */
2250 /* every time the encoder has a packet to send. */
2251 /* It depends on the encoder if the data starts */
2252 /* with a Start Code (it should). H.263 does. */
2253 /* mb_nb contains the number of macroblocks */
2254 /* encoded in the RTP payload. */
2255 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2257 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2258 /* do its best to deliver a chunk with size */
2259 /* below rtp_payload_size, the chunk will start */
2260 /* with a start code on some codecs like H.263. */
2261 /* This doesn't take account of any particular */
2262 /* headers inside the transmitted RTP payload. */
2264 /* statistics, used for 2-pass encoding */
2275 * number of bits used for the previously encoded frame
2276 * - encoding: Set by libavcodec.
2277 * - decoding: unused
2282 * pass1 encoding statistics output buffer
2283 * - encoding: Set by libavcodec.
2284 * - decoding: unused
2289 * pass2 encoding statistics input buffer
2290 * Concatenated stuff from stats_out of pass1 should be placed here.
2291 * - encoding: Allocated/set/freed by user.
2292 * - decoding: unused
2297 * Work around bugs in encoders which sometimes cannot be detected automatically.
2298 * - encoding: Set by user
2299 * - decoding: Set by user
2301 int workaround_bugs;
2302 #define FF_BUG_AUTODETECT 1 ///< autodetection
2303 #if FF_API_OLD_MSMPEG4
2304 #define FF_BUG_OLD_MSMPEG4 2
2306 #define FF_BUG_XVID_ILACE 4
2307 #define FF_BUG_UMP4 8
2308 #define FF_BUG_NO_PADDING 16
2309 #define FF_BUG_AMV 32
2311 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2313 #define FF_BUG_QPEL_CHROMA 64
2314 #define FF_BUG_STD_QPEL 128
2315 #define FF_BUG_QPEL_CHROMA2 256
2316 #define FF_BUG_DIRECT_BLOCKSIZE 512
2317 #define FF_BUG_EDGE 1024
2318 #define FF_BUG_HPEL_CHROMA 2048
2319 #define FF_BUG_DC_CLIP 4096
2320 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2321 #define FF_BUG_TRUNCATED 16384
2324 * strictly follow the standard (MPEG4, ...).
2325 * - encoding: Set by user.
2326 * - decoding: Set by user.
2327 * Setting this to STRICT or higher means the encoder and decoder will
2328 * generally do stupid things, whereas setting it to unofficial or lower
2329 * will mean the encoder might produce output that is not supported by all
2330 * spec-compliant decoders. Decoders don't differentiate between normal,
2331 * unofficial and experimental (that is, they always try to decode things
2332 * when they can) unless they are explicitly asked to behave stupidly
2333 * (=strictly conform to the specs)
2335 int strict_std_compliance;
2336 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2337 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2338 #define FF_COMPLIANCE_NORMAL 0
2339 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2340 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2343 * error concealment flags
2344 * - encoding: unused
2345 * - decoding: Set by user.
2347 int error_concealment;
2348 #define FF_EC_GUESS_MVS 1
2349 #define FF_EC_DEBLOCK 2
2353 * - encoding: Set by user.
2354 * - decoding: Set by user.
2357 #define FF_DEBUG_PICT_INFO 1
2358 #define FF_DEBUG_RC 2
2359 #define FF_DEBUG_BITSTREAM 4
2360 #define FF_DEBUG_MB_TYPE 8
2361 #define FF_DEBUG_QP 16
2364 * @deprecated this option does nothing
2366 #define FF_DEBUG_MV 32
2368 #define FF_DEBUG_DCT_COEFF 0x00000040
2369 #define FF_DEBUG_SKIP 0x00000080
2370 #define FF_DEBUG_STARTCODE 0x00000100
2371 #if FF_API_UNUSED_MEMBERS
2372 #define FF_DEBUG_PTS 0x00000200
2373 #endif /* FF_API_UNUSED_MEMBERS */
2374 #define FF_DEBUG_ER 0x00000400
2375 #define FF_DEBUG_MMCO 0x00000800
2376 #define FF_DEBUG_BUGS 0x00001000
2378 #define FF_DEBUG_VIS_QP 0x00002000
2379 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2381 #define FF_DEBUG_BUFFERS 0x00008000
2382 #define FF_DEBUG_THREADS 0x00010000
2386 * @deprecated this option does not have any effect
2388 attribute_deprecated
2390 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2391 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2392 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2396 * Error recognition; may misdetect some more or less valid parts as errors.
2397 * - encoding: unused
2398 * - decoding: Set by user.
2400 int err_recognition;
2403 * Verify checksums embedded in the bitstream (could be of either encoded or
2404 * decoded data, depending on the codec) and print an error message on mismatch.
2405 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2406 * decoder returning an error.
2408 #define AV_EF_CRCCHECK (1<<0)
2409 #define AV_EF_BITSTREAM (1<<1)
2410 #define AV_EF_BUFFER (1<<2)
2411 #define AV_EF_EXPLODE (1<<3)
2414 * opaque 64bit number (generally a PTS) that will be reordered and
2415 * output in AVFrame.reordered_opaque
2416 * - encoding: unused
2417 * - decoding: Set by user.
2419 int64_t reordered_opaque;
2422 * Hardware accelerator in use
2423 * - encoding: unused.
2424 * - decoding: Set by libavcodec
2426 struct AVHWAccel *hwaccel;
2429 * Hardware accelerator context.
2430 * For some hardware accelerators, a global context needs to be
2431 * provided by the user. In that case, this holds display-dependent
2432 * data Libav cannot instantiate itself. Please refer to the
2433 * Libav HW accelerator documentation to know how to fill this
2434 * is. e.g. for VA API, this is a struct vaapi_context.
2435 * - encoding: unused
2436 * - decoding: Set by user
2438 void *hwaccel_context;
2442 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2443 * - decoding: unused
2445 uint64_t error[AV_NUM_DATA_POINTERS];
2448 * DCT algorithm, see FF_DCT_* below
2449 * - encoding: Set by user.
2450 * - decoding: unused
2453 #define FF_DCT_AUTO 0
2454 #define FF_DCT_FASTINT 1
2455 #if FF_API_UNUSED_MEMBERS
2456 #define FF_DCT_INT 2
2457 #endif /* FF_API_UNUSED_MEMBERS */
2458 #define FF_DCT_MMX 3
2459 #define FF_DCT_ALTIVEC 5
2460 #define FF_DCT_FAAN 6
2463 * IDCT algorithm, see FF_IDCT_* below.
2464 * - encoding: Set by user.
2465 * - decoding: Set by user.
2468 #define FF_IDCT_AUTO 0
2469 #define FF_IDCT_INT 1
2470 #define FF_IDCT_SIMPLE 2
2471 #define FF_IDCT_SIMPLEMMX 3
2472 #define FF_IDCT_ARM 7
2473 #define FF_IDCT_ALTIVEC 8
2475 #define FF_IDCT_SH4 9
2477 #define FF_IDCT_SIMPLEARM 10
2478 #if FF_API_UNUSED_MEMBERS
2479 #define FF_IDCT_IPP 13
2480 #endif /* FF_API_UNUSED_MEMBERS */
2481 #define FF_IDCT_XVID 14
2482 #if FF_API_IDCT_XVIDMMX
2483 #define FF_IDCT_XVIDMMX 14
2484 #endif /* FF_API_IDCT_XVIDMMX */
2485 #define FF_IDCT_SIMPLEARMV5TE 16
2486 #define FF_IDCT_SIMPLEARMV6 17
2487 #if FF_API_ARCH_SPARC
2488 #define FF_IDCT_SIMPLEVIS 18
2490 #define FF_IDCT_FAAN 20
2491 #define FF_IDCT_SIMPLENEON 22
2492 #if FF_API_ARCH_ALPHA
2493 #define FF_IDCT_SIMPLEALPHA 23
2497 * bits per sample/pixel from the demuxer (needed for huffyuv).
2498 * - encoding: Set by libavcodec.
2499 * - decoding: Set by user.
2501 int bits_per_coded_sample;
2504 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2505 * - encoding: set by user.
2506 * - decoding: set by libavcodec.
2508 int bits_per_raw_sample;
2512 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2513 * - encoding: unused
2514 * - decoding: Set by user.
2516 * @deprecated use decoder private options instead
2518 attribute_deprecated int lowres;
2522 * the picture in the bitstream
2523 * - encoding: Set by libavcodec.
2524 * - decoding: unused
2526 AVFrame *coded_frame;
2530 * is used to decide how many independent tasks should be passed to execute()
2531 * - encoding: Set by user.
2532 * - decoding: Set by user.
2537 * Which multithreading methods to use.
2538 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2539 * so clients which cannot provide future frames should not use it.
2541 * - encoding: Set by user, otherwise the default is used.
2542 * - decoding: Set by user, otherwise the default is used.
2545 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2546 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2549 * Which multithreading methods are in use by the codec.
2550 * - encoding: Set by libavcodec.
2551 * - decoding: Set by libavcodec.
2553 int active_thread_type;
2556 * Set by the client if its custom get_buffer() callback can be called
2557 * synchronously from another thread, which allows faster multithreaded decoding.
2558 * draw_horiz_band() will be called from other threads regardless of this setting.
2559 * Ignored if the default get_buffer() is used.
2560 * - encoding: Set by user.
2561 * - decoding: Set by user.
2563 int thread_safe_callbacks;
2566 * The codec may call this to execute several independent things.
2567 * It will return only after finishing all tasks.
2568 * The user may replace this with some multithreaded implementation,
2569 * the default implementation will execute the parts serially.
2570 * @param count the number of things to execute
2571 * - encoding: Set by libavcodec, user can override.
2572 * - decoding: Set by libavcodec, user can override.
2574 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2577 * The codec may call this to execute several independent things.
2578 * It will return only after finishing all tasks.
2579 * The user may replace this with some multithreaded implementation,
2580 * the default implementation will execute the parts serially.
2581 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2582 * @param c context passed also to func
2583 * @param count the number of things to execute
2584 * @param arg2 argument passed unchanged to func
2585 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2586 * @param func function that will be called count times, with jobnr from 0 to count-1.
2587 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2588 * two instances of func executing at the same time will have the same threadnr.
2589 * @return always 0 currently, but code should handle a future improvement where when any call to func
2590 * returns < 0 no further calls to func may be done and < 0 is returned.
2591 * - encoding: Set by libavcodec, user can override.
2592 * - decoding: Set by libavcodec, user can override.
2594 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2596 #if FF_API_THREAD_OPAQUE
2598 * @deprecated this field should not be used from outside of lavc
2600 attribute_deprecated
2601 void *thread_opaque;
2605 * noise vs. sse weight for the nsse comparsion function
2606 * - encoding: Set by user.
2607 * - decoding: unused
2613 * - encoding: Set by user.
2614 * - decoding: Set by libavcodec.
2617 #define FF_PROFILE_UNKNOWN -99
2618 #define FF_PROFILE_RESERVED -100
2620 #define FF_PROFILE_AAC_MAIN 0
2621 #define FF_PROFILE_AAC_LOW 1
2622 #define FF_PROFILE_AAC_SSR 2
2623 #define FF_PROFILE_AAC_LTP 3
2624 #define FF_PROFILE_AAC_HE 4
2625 #define FF_PROFILE_AAC_HE_V2 28
2626 #define FF_PROFILE_AAC_LD 22
2627 #define FF_PROFILE_AAC_ELD 38
2628 #define FF_PROFILE_MPEG2_AAC_LOW 128
2629 #define FF_PROFILE_MPEG2_AAC_HE 131
2631 #define FF_PROFILE_DTS 20
2632 #define FF_PROFILE_DTS_ES 30
2633 #define FF_PROFILE_DTS_96_24 40
2634 #define FF_PROFILE_DTS_HD_HRA 50
2635 #define FF_PROFILE_DTS_HD_MA 60
2637 #define FF_PROFILE_MPEG2_422 0
2638 #define FF_PROFILE_MPEG2_HIGH 1
2639 #define FF_PROFILE_MPEG2_SS 2
2640 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2641 #define FF_PROFILE_MPEG2_MAIN 4
2642 #define FF_PROFILE_MPEG2_SIMPLE 5
2644 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2645 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2647 #define FF_PROFILE_H264_BASELINE 66
2648 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2649 #define FF_PROFILE_H264_MAIN 77
2650 #define FF_PROFILE_H264_EXTENDED 88
2651 #define FF_PROFILE_H264_HIGH 100
2652 #define FF_PROFILE_H264_HIGH_10 110
2653 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2654 #define FF_PROFILE_H264_HIGH_422 122
2655 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2656 #define FF_PROFILE_H264_HIGH_444 144
2657 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2658 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2659 #define FF_PROFILE_H264_CAVLC_444 44
2661 #define FF_PROFILE_VC1_SIMPLE 0
2662 #define FF_PROFILE_VC1_MAIN 1
2663 #define FF_PROFILE_VC1_COMPLEX 2
2664 #define FF_PROFILE_VC1_ADVANCED 3
2666 #define FF_PROFILE_MPEG4_SIMPLE 0
2667 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2668 #define FF_PROFILE_MPEG4_CORE 2
2669 #define FF_PROFILE_MPEG4_MAIN 3
2670 #define FF_PROFILE_MPEG4_N_BIT 4
2671 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2672 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2673 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2674 #define FF_PROFILE_MPEG4_HYBRID 8
2675 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2676 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2677 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2678 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2679 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2680 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2681 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2683 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2684 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2685 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2686 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2687 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2690 #define FF_PROFILE_HEVC_MAIN 1
2691 #define FF_PROFILE_HEVC_MAIN_10 2
2692 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2696 * - encoding: Set by user.
2697 * - decoding: Set by libavcodec.
2700 #define FF_LEVEL_UNKNOWN -99
2704 * - encoding: unused
2705 * - decoding: Set by user.
2707 enum AVDiscard skip_loop_filter;
2711 * - encoding: unused
2712 * - decoding: Set by user.
2714 enum AVDiscard skip_idct;
2718 * - encoding: unused
2719 * - decoding: Set by user.
2721 enum AVDiscard skip_frame;
2724 * Header containing style information for text subtitles.
2725 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2726 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2727 * the Format line following. It shouldn't include any Dialogue line.
2728 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2729 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2731 uint8_t *subtitle_header;
2732 int subtitle_header_size;
2734 #if FF_API_ERROR_RATE
2736 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2739 attribute_deprecated
2743 #if FF_API_CODEC_PKT
2745 * @deprecated this field is not supposed to be accessed from outside lavc
2747 attribute_deprecated
2752 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2753 * Used for compliant TS muxing.
2754 * - encoding: Set by libavcodec.
2755 * - decoding: unused.
2760 * Encoding only. Allow encoders to output packets that do not contain any
2761 * encoded data, only side data.
2763 * Some encoders need to output such packets, e.g. to update some stream
2764 * parameters at the end of encoding.
2766 * All callers are strongly recommended to set this option to 1 and update
2767 * their code to deal with such packets, since this behaviour may become
2768 * always enabled in the future (then this option will be deprecated and
2769 * later removed). To avoid ABI issues when this happens, the callers should
2770 * use AVOptions to set this field.
2772 int side_data_only_packets;
2778 typedef struct AVProfile {
2780 const char *name; ///< short name for the profile
2783 typedef struct AVCodecDefault AVCodecDefault;
2790 typedef struct AVCodec {
2792 * Name of the codec implementation.
2793 * The name is globally unique among encoders and among decoders (but an
2794 * encoder and a decoder can share the same name).
2795 * This is the primary way to find a codec from the user perspective.
2799 * Descriptive name for the codec, meant to be more human readable than name.
2800 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2802 const char *long_name;
2803 enum AVMediaType type;
2806 * Codec capabilities.
2810 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2811 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2812 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2813 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2814 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2816 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2818 const AVClass *priv_class; ///< AVClass for the private context
2819 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2821 /*****************************************************************
2822 * No fields below this line are part of the public API. They
2823 * may not be used outside of libavcodec and can be changed and
2825 * New public fields should be added right above.
2826 *****************************************************************
2829 struct AVCodec *next;
2831 * @name Frame-level threading support functions
2835 * If defined, called on thread contexts when they are created.
2836 * If the codec allocates writable tables in init(), re-allocate them here.
2837 * priv_data will be set to a copy of the original.
2839 int (*init_thread_copy)(AVCodecContext *);
2841 * Copy necessary context variables from a previous thread context to the current one.
2842 * If not defined, the next thread will start automatically; otherwise, the codec
2843 * must call ff_thread_finish_setup().
2845 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2847 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2851 * Private codec-specific defaults.
2853 const AVCodecDefault *defaults;
2856 * Initialize codec static data, called from avcodec_register().
2858 void (*init_static_data)(struct AVCodec *codec);
2860 int (*init)(AVCodecContext *);
2861 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2862 const struct AVSubtitle *sub);
2864 * Encode data to an AVPacket.
2866 * @param avctx codec context
2867 * @param avpkt output AVPacket (may contain a user-provided buffer)
2868 * @param[in] frame AVFrame containing the raw data to be encoded
2869 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2870 * non-empty packet was returned in avpkt.
2871 * @return 0 on success, negative error code on failure
2873 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2874 int *got_packet_ptr);
2875 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2876 int (*close)(AVCodecContext *);
2879 * Will be called when seeking
2881 void (*flush)(AVCodecContext *);
2887 typedef struct AVHWAccel {
2889 * Name of the hardware accelerated codec.
2890 * The name is globally unique among encoders and among decoders (but an
2891 * encoder and a decoder can share the same name).
2896 * Type of codec implemented by the hardware accelerator.
2898 * See AVMEDIA_TYPE_xxx
2900 enum AVMediaType type;
2903 * Codec implemented by the hardware accelerator.
2905 * See AV_CODEC_ID_xxx
2910 * Supported pixel format.
2912 * Only hardware accelerated formats are supported here.
2914 enum AVPixelFormat pix_fmt;
2917 * Hardware accelerated codec capabilities.
2918 * see FF_HWACCEL_CODEC_CAP_*
2922 /*****************************************************************
2923 * No fields below this line are part of the public API. They
2924 * may not be used outside of libavcodec and can be changed and
2926 * New public fields should be added right above.
2927 *****************************************************************
2929 struct AVHWAccel *next;
2932 * Allocate a custom buffer
2934 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
2937 * Called at the beginning of each frame or field picture.
2939 * Meaningful frame information (codec specific) is guaranteed to
2940 * be parsed at this point. This function is mandatory.
2942 * Note that buf can be NULL along with buf_size set to 0.
2943 * Otherwise, this means the whole frame is available at this point.
2945 * @param avctx the codec context
2946 * @param buf the frame data buffer base
2947 * @param buf_size the size of the frame in bytes
2948 * @return zero if successful, a negative value otherwise
2950 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2953 * Callback for each slice.
2955 * Meaningful slice information (codec specific) is guaranteed to
2956 * be parsed at this point. This function is mandatory.
2958 * @param avctx the codec context
2959 * @param buf the slice data buffer base
2960 * @param buf_size the size of the slice in bytes
2961 * @return zero if successful, a negative value otherwise
2963 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2966 * Called at the end of each frame or field picture.
2968 * The whole picture is parsed at this point and can now be sent
2969 * to the hardware accelerator. This function is mandatory.
2971 * @param avctx the codec context
2972 * @return zero if successful, a negative value otherwise
2974 int (*end_frame)(AVCodecContext *avctx);
2977 * Size of per-frame hardware accelerator private data.
2979 * Private data is allocated with av_mallocz() before
2980 * AVCodecContext.get_buffer() and deallocated after
2981 * AVCodecContext.release_buffer().
2983 int frame_priv_data_size;
2986 * Initialize the hwaccel private data.
2988 * This will be called from ff_get_format(), after hwaccel and
2989 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
2992 int (*init)(AVCodecContext *avctx);
2995 * Uninitialize the hwaccel private data.
2997 * This will be called from get_format() or avcodec_close(), after hwaccel
2998 * and hwaccel_context are already uninitialized.
3000 int (*uninit)(AVCodecContext *avctx);
3003 * Size of the private data to allocate in
3004 * AVCodecInternal.hwaccel_priv_data.
3010 * @defgroup lavc_picture AVPicture
3012 * Functions for working with AVPicture
3017 * four components are given, that's all.
3018 * the last component is alpha
3020 typedef struct AVPicture {
3021 uint8_t *data[AV_NUM_DATA_POINTERS];
3022 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3029 #define AVPALETTE_SIZE 1024
3030 #define AVPALETTE_COUNT 256
3032 enum AVSubtitleType {
3035 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3038 * Plain text, the text field must be set by the decoder and is
3039 * authoritative. ass and pict fields may contain approximations.
3044 * Formatted text, the ass field must be set by the decoder and is
3045 * authoritative. pict and text fields may contain approximations.
3050 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3052 typedef struct AVSubtitleRect {
3053 int x; ///< top left corner of pict, undefined when pict is not set
3054 int y; ///< top left corner of pict, undefined when pict is not set
3055 int w; ///< width of pict, undefined when pict is not set
3056 int h; ///< height of pict, undefined when pict is not set
3057 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3060 * data+linesize for the bitmap of this subtitle.
3061 * can be set for text/ass as well once they where rendered
3064 enum AVSubtitleType type;
3066 char *text; ///< 0 terminated plain UTF-8 text
3069 * 0 terminated ASS/SSA compatible event line.
3070 * The pressentation of this is unaffected by the other values in this
3077 typedef struct AVSubtitle {
3078 uint16_t format; /* 0 = graphics */
3079 uint32_t start_display_time; /* relative to packet pts, in ms */
3080 uint32_t end_display_time; /* relative to packet pts, in ms */
3082 AVSubtitleRect **rects;
3083 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3087 * If c is NULL, returns the first registered codec,
3088 * if c is non-NULL, returns the next registered codec after c,
3089 * or NULL if c is the last one.
3091 AVCodec *av_codec_next(const AVCodec *c);
3094 * Return the LIBAVCODEC_VERSION_INT constant.
3096 unsigned avcodec_version(void);
3099 * Return the libavcodec build-time configuration.
3101 const char *avcodec_configuration(void);
3104 * Return the libavcodec license.
3106 const char *avcodec_license(void);
3109 * Register the codec codec and initialize libavcodec.
3111 * @warning either this function or avcodec_register_all() must be called
3112 * before any other libavcodec functions.
3114 * @see avcodec_register_all()
3116 void avcodec_register(AVCodec *codec);
3119 * Register all the codecs, parsers and bitstream filters which were enabled at
3120 * configuration time. If you do not call this function you can select exactly
3121 * which formats you want to support, by using the individual registration
3124 * @see avcodec_register
3125 * @see av_register_codec_parser
3126 * @see av_register_bitstream_filter
3128 void avcodec_register_all(void);
3131 * Allocate an AVCodecContext and set its fields to default values. The
3132 * resulting struct should be freed with avcodec_free_context().
3134 * @param codec if non-NULL, allocate private data and initialize defaults
3135 * for the given codec. It is illegal to then call avcodec_open2()
3136 * with a different codec.
3137 * If NULL, then the codec-specific defaults won't be initialized,
3138 * which may result in suboptimal default settings (this is
3139 * important mainly for encoders, e.g. libx264).
3141 * @return An AVCodecContext filled with default values or NULL on failure.
3142 * @see avcodec_get_context_defaults
3144 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3147 * Free the codec context and everything associated with it and write NULL to
3148 * the provided pointer.
3150 void avcodec_free_context(AVCodecContext **avctx);
3153 * Set the fields of the given AVCodecContext to default values corresponding
3154 * to the given codec (defaults may be codec-dependent).
3156 * Do not call this function if a non-NULL codec has been passed
3157 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3158 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3159 * different codec on this AVCodecContext.
3161 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3164 * Get the AVClass for AVCodecContext. It can be used in combination with
3165 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3167 * @see av_opt_find().
3169 const AVClass *avcodec_get_class(void);
3172 * Copy the settings of the source AVCodecContext into the destination
3173 * AVCodecContext. The resulting destination codec context will be
3174 * unopened, i.e. you are required to call avcodec_open2() before you
3175 * can use this AVCodecContext to decode/encode video/audio data.
3177 * @param dest target codec context, should be initialized with
3178 * avcodec_alloc_context3(), but otherwise uninitialized
3179 * @param src source codec context
3180 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3182 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3184 #if FF_API_AVFRAME_LAVC
3186 * @deprecated use av_frame_alloc()
3188 attribute_deprecated
3189 AVFrame *avcodec_alloc_frame(void);
3192 * Set the fields of the given AVFrame to default values.
3194 * @param frame The AVFrame of which the fields should be set to default values.
3196 * @deprecated use av_frame_unref()
3198 attribute_deprecated
3199 void avcodec_get_frame_defaults(AVFrame *frame);
3202 * Free the frame and any dynamically allocated objects in it,
3203 * e.g. extended_data.
3205 * @param frame frame to be freed. The pointer will be set to NULL.
3207 * @warning this function does NOT free the data buffers themselves
3208 * (it does not know how, since they might have been allocated with
3209 * a custom get_buffer()).
3211 * @deprecated use av_frame_free()
3213 attribute_deprecated
3214 void avcodec_free_frame(AVFrame **frame);
3218 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3219 * function the context has to be allocated with avcodec_alloc_context3().
3221 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3222 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3223 * retrieving a codec.
3225 * @warning This function is not thread safe!
3228 * avcodec_register_all();
3229 * av_dict_set(&opts, "b", "2.5M", 0);
3230 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3234 * context = avcodec_alloc_context3(codec);
3236 * if (avcodec_open2(context, codec, opts) < 0)
3240 * @param avctx The context to initialize.
3241 * @param codec The codec to open this context for. If a non-NULL codec has been
3242 * previously passed to avcodec_alloc_context3() or
3243 * avcodec_get_context_defaults3() for this context, then this
3244 * parameter MUST be either NULL or equal to the previously passed
3246 * @param options A dictionary filled with AVCodecContext and codec-private options.
3247 * On return this object will be filled with options that were not found.
3249 * @return zero on success, a negative value on error
3250 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3251 * av_dict_set(), av_opt_find().
3253 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3256 * Close a given AVCodecContext and free all the data associated with it
3257 * (but not the AVCodecContext itself).
3259 * Calling this function on an AVCodecContext that hasn't been opened will free
3260 * the codec-specific data allocated in avcodec_alloc_context3() /
3261 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3264 int avcodec_close(AVCodecContext *avctx);
3267 * Free all allocated data in the given subtitle struct.
3269 * @param sub AVSubtitle to free.
3271 void avsubtitle_free(AVSubtitle *sub);
3278 * @addtogroup lavc_packet
3282 #if FF_API_DESTRUCT_PACKET
3284 * Default packet destructor.
3285 * @deprecated use the AVBuffer API instead
3287 attribute_deprecated
3288 void av_destruct_packet(AVPacket *pkt);
3292 * Initialize optional fields of a packet with default values.
3294 * Note, this does not touch the data and size members, which have to be
3295 * initialized separately.
3299 void av_init_packet(AVPacket *pkt);
3302 * Allocate the payload of a packet and initialize its fields with
3306 * @param size wanted payload size
3307 * @return 0 if OK, AVERROR_xxx otherwise
3309 int av_new_packet(AVPacket *pkt, int size);
3312 * Reduce packet size, correctly zeroing padding
3315 * @param size new size
3317 void av_shrink_packet(AVPacket *pkt, int size);
3320 * Increase packet size, correctly zeroing padding
3323 * @param grow_by number of bytes by which to increase the size of the packet
3325 int av_grow_packet(AVPacket *pkt, int grow_by);
3328 * Initialize a reference-counted packet from av_malloc()ed data.
3330 * @param pkt packet to be initialized. This function will set the data, size,
3331 * buf and destruct fields, all others are left untouched.
3332 * @param data Data allocated by av_malloc() to be used as packet data. If this
3333 * function returns successfully, the data is owned by the underlying AVBuffer.
3334 * The caller may not access the data through other means.
3335 * @param size size of data in bytes, without the padding. I.e. the full buffer
3336 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3338 * @return 0 on success, a negative AVERROR on error
3340 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3343 * @warning This is a hack - the packet memory allocation stuff is broken. The
3344 * packet is allocated if it was not really allocated.
3346 int av_dup_packet(AVPacket *pkt);
3351 * @param pkt packet to free
3353 void av_free_packet(AVPacket *pkt);
3356 * Allocate new information of a packet.
3359 * @param type side information type
3360 * @param size side information size
3361 * @return pointer to fresh allocated data or NULL otherwise
3363 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3367 * Shrink the already allocated side data buffer
3370 * @param type side information type
3371 * @param size new side information size
3372 * @return 0 on success, < 0 on failure
3374 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3378 * Get side information from packet.
3381 * @param type desired side information type
3382 * @param size pointer for side information size to store (optional)
3383 * @return pointer to data if present or NULL otherwise
3385 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3389 * Convenience function to free all the side data stored.
3390 * All the other fields stay untouched.
3394 void av_packet_free_side_data(AVPacket *pkt);
3397 * Setup a new reference to the data described by a given packet
3399 * If src is reference-counted, setup dst as a new reference to the
3400 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3401 * data from src into it.
3403 * All the other fields are copied from src.
3405 * @see av_packet_unref
3407 * @param dst Destination packet
3408 * @param src Source packet
3410 * @return 0 on success, a negative AVERROR on error.
3412 int av_packet_ref(AVPacket *dst, AVPacket *src);
3417 * Unreference the buffer referenced by the packet and reset the
3418 * remaining packet fields to their default values.
3420 * @param pkt The packet to be unreferenced.
3422 void av_packet_unref(AVPacket *pkt);
3425 * Move every field in src to dst and reset src.
3427 * @see av_packet_unref
3429 * @param src Source packet, will be reset
3430 * @param dst Destination packet
3432 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3435 * Copy only "properties" fields from src to dst.
3437 * Properties for the purpose of this function are all the fields
3438 * beside those related to the packet data (buf, data, size)
3440 * @param dst Destination packet
3441 * @param src Source packet
3443 * @return 0 on success AVERROR on failure.
3446 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3449 * Convert valid timing fields (timestamps / durations) in a packet from one
3450 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
3453 * @param pkt packet on which the conversion will be performed
3454 * @param tb_src source timebase, in which the timing fields in pkt are
3456 * @param tb_dst destination timebase, to which the timing fields will be
3459 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
3466 * @addtogroup lavc_decoding
3471 * Find a registered decoder with a matching codec ID.
3473 * @param id AVCodecID of the requested decoder
3474 * @return A decoder if one was found, NULL otherwise.
3476 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3479 * Find a registered decoder with the specified name.
3481 * @param name name of the requested decoder
3482 * @return A decoder if one was found, NULL otherwise.
3484 AVCodec *avcodec_find_decoder_by_name(const char *name);
3486 #if FF_API_GET_BUFFER
3487 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3488 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3489 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3493 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3494 * it can be called by custom get_buffer2() implementations for decoders without
3495 * CODEC_CAP_DR1 set.
3497 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3501 * Return the amount of padding in pixels which the get_buffer callback must
3502 * provide around the edge of the image for codecs which do not have the
3503 * CODEC_FLAG_EMU_EDGE flag.
3505 * @return Required padding in pixels.
3507 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3510 attribute_deprecated
3511 unsigned avcodec_get_edge_width(void);
3515 * Modify width and height values so that they will result in a memory
3516 * buffer that is acceptable for the codec if you do not use any horizontal
3519 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3521 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3524 * Modify width and height values so that they will result in a memory
3525 * buffer that is acceptable for the codec if you also ensure that all
3526 * line sizes are a multiple of the respective linesize_align[i].
3528 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3530 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3531 int linesize_align[AV_NUM_DATA_POINTERS]);
3534 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3536 * Some decoders may support multiple frames in a single AVPacket. Such
3537 * decoders would then just decode the first frame and the return value would be
3538 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3539 * called again with an AVPacket containing the remaining data in order to
3540 * decode the second frame, etc... Even if no frames are returned, the packet
3541 * needs to be fed to the decoder with remaining data until it is completely
3542 * consumed or an error occurs.
3544 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3545 * and output. This means that for some packets they will not immediately
3546 * produce decoded output and need to be flushed at the end of decoding to get
3547 * all the decoded data. Flushing is done by calling this function with packets
3548 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3549 * returning samples. It is safe to flush even those decoders that are not
3550 * marked with CODEC_CAP_DELAY, then no samples will be returned.
3552 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3553 * larger than the actual read bytes because some optimized bitstream
3554 * readers read 32 or 64 bits at once and could read over the end.
3556 * @param avctx the codec context
3557 * @param[out] frame The AVFrame in which to store decoded audio samples.
3558 * The decoder will allocate a buffer for the decoded frame by
3559 * calling the AVCodecContext.get_buffer2() callback.
3560 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3561 * reference counted and the returned reference belongs to the
3562 * caller. The caller must release the frame using av_frame_unref()
3563 * when the frame is no longer needed. The caller may safely write
3564 * to the frame if av_frame_is_writable() returns 1.
3565 * When AVCodecContext.refcounted_frames is set to 0, the returned
3566 * reference belongs to the decoder and is valid only until the
3567 * next call to this function or until closing or flushing the
3568 * decoder. The caller may not write to it.
3569 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3570 * non-zero. Note that this field being set to zero
3571 * does not mean that an error has occurred. For
3572 * decoders with CODEC_CAP_DELAY set, no given decode
3573 * call is guaranteed to produce a frame.
3574 * @param[in] avpkt The input AVPacket containing the input buffer.
3575 * At least avpkt->data and avpkt->size should be set. Some
3576 * decoders might also require additional fields to be set.
3577 * @return A negative error code is returned if an error occurred during
3578 * decoding, otherwise the number of bytes consumed from the input
3579 * AVPacket is returned.
3581 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3582 int *got_frame_ptr, AVPacket *avpkt);
3585 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3586 * Some decoders may support multiple frames in a single AVPacket, such
3587 * decoders would then just decode the first frame.
3589 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3590 * the actual read bytes because some optimized bitstream readers read 32 or 64
3591 * bits at once and could read over the end.
3593 * @warning The end of the input buffer buf should be set to 0 to ensure that
3594 * no overreading happens for damaged MPEG streams.
3596 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3597 * between input and output, these need to be fed with avpkt->data=NULL,
3598 * avpkt->size=0 at the end to return the remaining frames.
3600 * @param avctx the codec context
3601 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3602 * Use av_frame_alloc() to get an AVFrame. The codec will
3603 * allocate memory for the actual bitmap by calling the
3604 * AVCodecContext.get_buffer2() callback.
3605 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3606 * reference counted and the returned reference belongs to the
3607 * caller. The caller must release the frame using av_frame_unref()
3608 * when the frame is no longer needed. The caller may safely write
3609 * to the frame if av_frame_is_writable() returns 1.
3610 * When AVCodecContext.refcounted_frames is set to 0, the returned
3611 * reference belongs to the decoder and is valid only until the
3612 * next call to this function or until closing or flushing the
3613 * decoder. The caller may not write to it.
3615 * @param[in] avpkt The input AVpacket containing the input buffer.
3616 * You can create such packet with av_init_packet() and by then setting
3617 * data and size, some decoders might in addition need other fields like
3618 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3620 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3621 * @return On error a negative value is returned, otherwise the number of bytes
3622 * used or zero if no frame could be decompressed.
3624 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3625 int *got_picture_ptr,
3629 * Decode a subtitle message.
3630 * Return a negative value on error, otherwise return the number of bytes used.
3631 * If no subtitle could be decompressed, got_sub_ptr is zero.
3632 * Otherwise, the subtitle is stored in *sub.
3633 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3634 * simplicity, because the performance difference is expect to be negligible
3635 * and reusing a get_buffer written for video codecs would probably perform badly
3636 * due to a potentially very different allocation pattern.
3638 * @param avctx the codec context
3639 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3640 freed with avsubtitle_free if *got_sub_ptr is set.
3641 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3642 * @param[in] avpkt The input AVPacket containing the input buffer.
3644 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3649 * @defgroup lavc_parsing Frame parsing
3653 enum AVPictureStructure {
3654 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3655 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3656 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3657 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3660 typedef struct AVCodecParserContext {
3662 struct AVCodecParser *parser;
3663 int64_t frame_offset; /* offset of the current frame */
3664 int64_t cur_offset; /* current offset
3665 (incremented by each av_parser_parse()) */
3666 int64_t next_frame_offset; /* offset of the next frame */
3668 int pict_type; /* XXX: Put it back in AVCodecContext. */
3670 * This field is used for proper frame duration computation in lavf.
3671 * It signals, how much longer the frame duration of the current frame
3672 * is compared to normal frame duration.
3674 * frame_duration = (1 + repeat_pict) * time_base
3676 * It is used by codecs like H.264 to display telecined material.
3678 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3679 int64_t pts; /* pts of the current frame */
3680 int64_t dts; /* dts of the current frame */
3685 int fetch_timestamp;
3687 #define AV_PARSER_PTS_NB 4
3688 int cur_frame_start_index;
3689 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3690 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3691 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3694 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3695 #define PARSER_FLAG_ONCE 0x0002
3696 /// Set if the parser has a valid file offset
3697 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3699 int64_t offset; ///< byte offset from starting packet start
3700 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3703 * Set by parser to 1 for key frames and 0 for non-key frames.
3704 * It is initialized to -1, so if the parser doesn't set this flag,
3705 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3711 * Time difference in stream time base units from the pts of this
3712 * packet to the point at which the output from the decoder has converged
3713 * independent from the availability of previous frames. That is, the
3714 * frames are virtually identical no matter if decoding started from
3715 * the very first frame or from this keyframe.
3716 * Is AV_NOPTS_VALUE if unknown.
3717 * This field is not the display duration of the current frame.
3718 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3721 * The purpose of this field is to allow seeking in streams that have no
3722 * keyframes in the conventional sense. It corresponds to the
3723 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3724 * essential for some types of subtitle streams to ensure that all
3725 * subtitles are correctly displayed after seeking.
3727 int64_t convergence_duration;
3729 // Timestamp generation support:
3731 * Synchronization point for start of timestamp generation.
3733 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3736 * For example, this corresponds to presence of H.264 buffering period
3742 * Offset of the current timestamp against last timestamp sync point in
3743 * units of AVCodecContext.time_base.
3745 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3746 * contain a valid timestamp offset.
3748 * Note that the timestamp of sync point has usually a nonzero
3749 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3750 * the next frame after timestamp sync point will be usually 1.
3752 * For example, this corresponds to H.264 cpb_removal_delay.
3754 int dts_ref_dts_delta;
3757 * Presentation delay of current frame in units of AVCodecContext.time_base.
3759 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3760 * contain valid non-negative timestamp delta (presentation time of a frame
3761 * must not lie in the past).
3763 * This delay represents the difference between decoding and presentation
3764 * time of the frame.
3766 * For example, this corresponds to H.264 dpb_output_delay.
3771 * Position of the packet in file.
3773 * Analogous to cur_frame_pts/dts
3775 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3778 * Byte position of currently parsed frame in stream.
3783 * Previous frame byte position.
3788 * Duration of the current frame.
3789 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3790 * For all other types, this is in units of AVCodecContext.time_base.
3794 enum AVFieldOrder field_order;
3797 * Indicate whether a picture is coded as a frame, top field or bottom field.
3799 * For example, H.264 field_pic_flag equal to 0 corresponds to
3800 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3801 * equal to 1 and bottom_field_flag equal to 0 corresponds to
3802 * AV_PICTURE_STRUCTURE_TOP_FIELD.
3804 enum AVPictureStructure picture_structure;
3807 * Picture number incremented in presentation or output order.
3808 * This field may be reinitialized at the first picture of a new sequence.
3810 * For example, this corresponds to H.264 PicOrderCnt.
3812 int output_picture_number;
3813 } AVCodecParserContext;
3815 typedef struct AVCodecParser {
3816 int codec_ids[5]; /* several codec IDs are permitted */
3818 int (*parser_init)(AVCodecParserContext *s);
3819 int (*parser_parse)(AVCodecParserContext *s,
3820 AVCodecContext *avctx,
3821 const uint8_t **poutbuf, int *poutbuf_size,
3822 const uint8_t *buf, int buf_size);
3823 void (*parser_close)(AVCodecParserContext *s);
3824 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3825 struct AVCodecParser *next;
3828 AVCodecParser *av_parser_next(const AVCodecParser *c);
3830 void av_register_codec_parser(AVCodecParser *parser);
3831 AVCodecParserContext *av_parser_init(int codec_id);
3836 * @param s parser context.
3837 * @param avctx codec context.
3838 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3839 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3840 * @param buf input buffer.
3841 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3842 * @param pts input presentation timestamp.
3843 * @param dts input decoding timestamp.
3844 * @param pos input byte position in stream.
3845 * @return the number of bytes of the input bitstream used.
3850 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3857 * decode_frame(data, size);
3861 int av_parser_parse2(AVCodecParserContext *s,
3862 AVCodecContext *avctx,
3863 uint8_t **poutbuf, int *poutbuf_size,
3864 const uint8_t *buf, int buf_size,
3865 int64_t pts, int64_t dts,
3869 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3870 * @deprecated use AVBitstreamFilter
3872 int av_parser_change(AVCodecParserContext *s,
3873 AVCodecContext *avctx,
3874 uint8_t **poutbuf, int *poutbuf_size,
3875 const uint8_t *buf, int buf_size, int keyframe);
3876 void av_parser_close(AVCodecParserContext *s);
3884 * @addtogroup lavc_encoding
3889 * Find a registered encoder with a matching codec ID.
3891 * @param id AVCodecID of the requested encoder
3892 * @return An encoder if one was found, NULL otherwise.
3894 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3897 * Find a registered encoder with the specified name.
3899 * @param name name of the requested encoder
3900 * @return An encoder if one was found, NULL otherwise.
3902 AVCodec *avcodec_find_encoder_by_name(const char *name);
3905 * Encode a frame of audio.
3907 * Takes input samples from frame and writes the next output packet, if
3908 * available, to avpkt. The output packet does not necessarily contain data for
3909 * the most recent frame, as encoders can delay, split, and combine input frames
3910 * internally as needed.
3912 * @param avctx codec context
3913 * @param avpkt output AVPacket.
3914 * The user can supply an output buffer by setting
3915 * avpkt->data and avpkt->size prior to calling the
3916 * function, but if the size of the user-provided data is not
3917 * large enough, encoding will fail. All other AVPacket fields
3918 * will be reset by the encoder using av_init_packet(). If
3919 * avpkt->data is NULL, the encoder will allocate it.
3920 * The encoder will set avpkt->size to the size of the
3923 * If this function fails or produces no output, avpkt will be
3924 * freed using av_free_packet() (i.e. avpkt->destruct will be
3925 * called to free the user supplied buffer).
3926 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3927 * May be NULL when flushing an encoder that has the
3928 * CODEC_CAP_DELAY capability set.
3929 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3930 * can have any number of samples.
3931 * If it is not set, frame->nb_samples must be equal to
3932 * avctx->frame_size for all frames except the last.
3933 * The final frame may be smaller than avctx->frame_size.
3934 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3935 * output packet is non-empty, and to 0 if it is
3936 * empty. If the function returns an error, the
3937 * packet can be assumed to be invalid, and the
3938 * value of got_packet_ptr is undefined and should
3940 * @return 0 on success, negative error code on failure
3942 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3943 const AVFrame *frame, int *got_packet_ptr);
3946 * Encode a frame of video.
3948 * Takes input raw video data from frame and writes the next output packet, if
3949 * available, to avpkt. The output packet does not necessarily contain data for
3950 * the most recent frame, as encoders can delay and reorder input frames
3951 * internally as needed.
3953 * @param avctx codec context
3954 * @param avpkt output AVPacket.
3955 * The user can supply an output buffer by setting
3956 * avpkt->data and avpkt->size prior to calling the
3957 * function, but if the size of the user-provided data is not
3958 * large enough, encoding will fail. All other AVPacket fields
3959 * will be reset by the encoder using av_init_packet(). If
3960 * avpkt->data is NULL, the encoder will allocate it.
3961 * The encoder will set avpkt->size to the size of the
3962 * output packet. The returned data (if any) belongs to the
3963 * caller, he is responsible for freeing it.
3965 * If this function fails or produces no output, avpkt will be
3966 * freed using av_free_packet() (i.e. avpkt->destruct will be
3967 * called to free the user supplied buffer).
3968 * @param[in] frame AVFrame containing the raw video data to be encoded.
3969 * May be NULL when flushing an encoder that has the
3970 * CODEC_CAP_DELAY capability set.
3971 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3972 * output packet is non-empty, and to 0 if it is
3973 * empty. If the function returns an error, the
3974 * packet can be assumed to be invalid, and the
3975 * value of got_packet_ptr is undefined and should
3977 * @return 0 on success, negative error code on failure
3979 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3980 const AVFrame *frame, int *got_packet_ptr);
3982 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3983 const AVSubtitle *sub);
3991 * @addtogroup lavc_picture
3996 * Allocate memory for a picture. Call avpicture_free() to free it.
3998 * @see avpicture_fill()
4000 * @param picture the picture to be filled in
4001 * @param pix_fmt the format of the picture
4002 * @param width the width of the picture
4003 * @param height the height of the picture
4004 * @return zero if successful, a negative value if not
4006 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4009 * Free a picture previously allocated by avpicture_alloc().
4010 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4013 * @param picture the AVPicture to be freed
4015 void avpicture_free(AVPicture *picture);
4018 * Fill in the AVPicture fields.
4019 * The fields of the given AVPicture are filled in by using the 'ptr' address
4020 * which points to the image data buffer. Depending on the specified picture
4021 * format, one or multiple image data pointers and line sizes will be set.
4022 * If a planar format is specified, several pointers will be set pointing to
4023 * the different picture planes and the line sizes of the different planes
4024 * will be stored in the lines_sizes array.
4025 * Call with ptr == NULL to get the required size for the ptr buffer.
4027 * To allocate the buffer and fill in the AVPicture fields in one call,
4028 * use avpicture_alloc().
4030 * @param picture AVPicture whose fields are to be filled in
4031 * @param ptr Buffer which will contain or contains the actual image data
4032 * @param pix_fmt The format in which the picture data is stored.
4033 * @param width the width of the image in pixels
4034 * @param height the height of the image in pixels
4035 * @return size of the image data in bytes
4037 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4038 enum AVPixelFormat pix_fmt, int width, int height);
4041 * Copy pixel data from an AVPicture into a buffer.
4042 * The data is stored compactly, without any gaps for alignment or padding
4043 * which may be applied by avpicture_fill().
4045 * @see avpicture_get_size()
4047 * @param[in] src AVPicture containing image data
4048 * @param[in] pix_fmt The format in which the picture data is stored.
4049 * @param[in] width the width of the image in pixels.
4050 * @param[in] height the height of the image in pixels.
4051 * @param[out] dest A buffer into which picture data will be copied.
4052 * @param[in] dest_size The size of 'dest'.
4053 * @return The number of bytes written to dest, or a negative value (error code) on error.
4055 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4056 int width, int height,
4057 unsigned char *dest, int dest_size);
4060 * Calculate the size in bytes that a picture of the given width and height
4061 * would occupy if stored in the given picture format.
4062 * Note that this returns the size of a compact representation as generated
4063 * by avpicture_layout(), which can be smaller than the size required for e.g.
4066 * @param pix_fmt the given picture format
4067 * @param width the width of the image
4068 * @param height the height of the image
4069 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
4071 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4073 #if FF_API_DEINTERLACE
4075 * deinterlace - if not supported return -1
4077 * @deprecated - use yadif (in libavfilter) instead
4079 attribute_deprecated
4080 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4081 enum AVPixelFormat pix_fmt, int width, int height);
4084 * Copy image src to dst. Wraps av_picture_data_copy() above.
4086 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4087 enum AVPixelFormat pix_fmt, int width, int height);
4090 * Crop image top and left side.
4092 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4093 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4098 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4099 int padtop, int padbottom, int padleft, int padright, int *color);
4106 * @defgroup lavc_misc Utility functions
4109 * Miscellaneous utility functions related to both encoding and decoding
4115 * @defgroup lavc_misc_pixfmt Pixel formats
4117 * Functions for working with pixel formats.
4122 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
4125 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4128 * Return a value representing the fourCC code associated to the
4129 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4132 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4134 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4135 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4136 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4137 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4138 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4139 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4142 * Compute what kind of losses will occur when converting from one specific
4143 * pixel format to another.
4144 * When converting from one pixel format to another, information loss may occur.
4145 * For example, when converting from RGB24 to GRAY, the color information will
4146 * be lost. Similarly, other losses occur when converting from some formats to
4147 * other formats. These losses can involve loss of chroma, but also loss of
4148 * resolution, loss of color depth, loss due to the color space conversion, loss
4149 * of the alpha bits or loss due to color quantization.
4150 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4151 * which will occur when converting from one pixel format to another.
4153 * @param[in] dst_pix_fmt destination pixel format
4154 * @param[in] src_pix_fmt source pixel format
4155 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4156 * @return Combination of flags informing you what kind of losses will occur.
4158 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4162 * Find the best pixel format to convert to given a certain source pixel
4163 * format. When converting from one pixel format to another, information loss
4164 * may occur. For example, when converting from RGB24 to GRAY, the color
4165 * information will be lost. Similarly, other losses occur when converting from
4166 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4167 * the given pixel formats should be used to suffer the least amount of loss.
4168 * The pixel formats from which it chooses one, are determined by the
4169 * pix_fmt_list parameter.
4172 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4173 * @param[in] src_pix_fmt source pixel format
4174 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4175 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4176 * @return The best pixel format to convert to or -1 if none was found.
4178 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4179 enum AVPixelFormat src_pix_fmt,
4180 int has_alpha, int *loss_ptr);
4182 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4188 #if FF_API_SET_DIMENSIONS
4190 * @deprecated this function is not supposed to be used from outside of lavc
4192 attribute_deprecated
4193 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4197 * Put a string representing the codec tag codec_tag in buf.
4199 * @param buf buffer to place codec tag in
4200 * @param buf_size size in bytes of buf
4201 * @param codec_tag codec tag to assign
4202 * @return the length of the string that would have been generated if
4203 * enough space had been available, excluding the trailing null
4205 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4207 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4210 * Return a name for the specified profile, if available.
4212 * @param codec the codec that is searched for the given profile
4213 * @param profile the profile value for which a name is requested
4214 * @return A name for the profile if found, NULL otherwise.
4216 const char *av_get_profile_name(const AVCodec *codec, int profile);
4218 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4219 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4220 //FIXME func typedef
4223 * Fill audio frame data and linesize.
4224 * AVFrame extended_data channel pointers are allocated if necessary for
4227 * @param frame the AVFrame
4228 * frame->nb_samples must be set prior to calling the
4229 * function. This function fills in frame->data,
4230 * frame->extended_data, frame->linesize[0].
4231 * @param nb_channels channel count
4232 * @param sample_fmt sample format
4233 * @param buf buffer to use for frame data
4234 * @param buf_size size of buffer
4235 * @param align plane size sample alignment (0 = default)
4236 * @return 0 on success, negative error code on failure
4238 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4239 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4240 int buf_size, int align);
4243 * Reset the internal decoder state / flush internal buffers. Should be called
4244 * e.g. when seeking or when switching to a different stream.
4246 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4247 * this invalidates the frames previously returned from the decoder. When
4248 * refcounted frames are used, the decoder just releases any references it might
4249 * keep internally, but the caller's reference remains valid.
4251 void avcodec_flush_buffers(AVCodecContext *avctx);
4254 * Return codec bits per sample.
4256 * @param[in] codec_id the codec
4257 * @return Number of bits per sample or zero if unknown for the given codec.
4259 int av_get_bits_per_sample(enum AVCodecID codec_id);
4262 * Return codec bits per sample.
4263 * Only return non-zero if the bits per sample is exactly correct, not an
4266 * @param[in] codec_id the codec
4267 * @return Number of bits per sample or zero if unknown for the given codec.
4269 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4272 * Return audio frame duration.
4274 * @param avctx codec context
4275 * @param frame_bytes size of the frame, or 0 if unknown
4276 * @return frame duration, in samples, if known. 0 if not able to
4279 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4282 typedef struct AVBitStreamFilterContext {
4284 struct AVBitStreamFilter *filter;
4285 AVCodecParserContext *parser;
4286 struct AVBitStreamFilterContext *next;
4287 } AVBitStreamFilterContext;
4290 typedef struct AVBitStreamFilter {
4293 int (*filter)(AVBitStreamFilterContext *bsfc,
4294 AVCodecContext *avctx, const char *args,
4295 uint8_t **poutbuf, int *poutbuf_size,
4296 const uint8_t *buf, int buf_size, int keyframe);
4297 void (*close)(AVBitStreamFilterContext *bsfc);
4298 struct AVBitStreamFilter *next;
4299 } AVBitStreamFilter;
4301 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4302 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4303 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4304 AVCodecContext *avctx, const char *args,
4305 uint8_t **poutbuf, int *poutbuf_size,
4306 const uint8_t *buf, int buf_size, int keyframe);
4307 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4309 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
4314 * Allocate a buffer with padding, reusing the given one if large enough.
4316 * Same behaviour av_fast_malloc but the buffer has additional
4317 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4320 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4323 * Encode extradata length to a buffer. Used by xiph codecs.
4325 * @param s buffer to write to; must be at least (v/255+1) bytes long
4326 * @param v size of extradata in bytes
4327 * @return number of bytes written to the buffer.
4329 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4331 #if FF_API_MISSING_SAMPLE
4333 * Log a generic warning message about a missing feature. This function is
4334 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4335 * only, and would normally not be used by applications.
4336 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4337 * a pointer to an AVClass struct
4338 * @param[in] feature string containing the name of the missing feature
4339 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4340 * If want_sample is non-zero, additional verbage will be added to the log
4341 * message which tells the user how to report samples to the development
4343 * @deprecated Use avpriv_report_missing_feature() instead.
4345 attribute_deprecated
4346 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4349 * Log a generic warning message asking for a sample. This function is
4350 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4351 * only, and would normally not be used by applications.
4352 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4353 * a pointer to an AVClass struct
4354 * @param[in] msg string containing an optional message, or NULL if no message
4355 * @deprecated Use avpriv_request_sample() instead.
4357 attribute_deprecated
4358 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4359 #endif /* FF_API_MISSING_SAMPLE */
4362 * Register the hardware accelerator hwaccel.
4364 void av_register_hwaccel(AVHWAccel *hwaccel);
4367 * If hwaccel is NULL, returns the first registered hardware accelerator,
4368 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4369 * after hwaccel, or NULL if hwaccel is the last one.
4371 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
4375 * Lock operation used by lockmgr
4378 AV_LOCK_CREATE, ///< Create a mutex
4379 AV_LOCK_OBTAIN, ///< Lock the mutex
4380 AV_LOCK_RELEASE, ///< Unlock the mutex
4381 AV_LOCK_DESTROY, ///< Free mutex resources
4385 * Register a user provided lock manager supporting the operations
4386 * specified by AVLockOp. mutex points to a (void *) where the
4387 * lockmgr should store/get a pointer to a user allocated mutex. It's
4388 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4390 * @param cb User defined callback. Note: Libav may invoke calls to this
4391 * callback during the call to av_lockmgr_register().
4392 * Thus, the application must be prepared to handle that.
4393 * If cb is set to NULL the lockmgr will be unregistered.
4394 * Also note that during unregistration the previously registered
4395 * lockmgr callback may also be invoked.
4397 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4400 * Get the type of the given codec.
4402 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4405 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4406 * with no corresponding avcodec_close()), 0 otherwise.
4408 int avcodec_is_open(AVCodecContext *s);
4411 * @return a non-zero number if codec is an encoder, zero otherwise
4413 int av_codec_is_encoder(const AVCodec *codec);
4416 * @return a non-zero number if codec is a decoder, zero otherwise
4418 int av_codec_is_decoder(const AVCodec *codec);
4421 * @return descriptor for given codec ID or NULL if no descriptor exists.
4423 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4426 * Iterate over all codec descriptors known to libavcodec.
4428 * @param prev previous descriptor. NULL to get the first descriptor.
4430 * @return next descriptor or NULL after the last descriptor
4432 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4435 * @return codec descriptor with the given name or NULL if no such descriptor
4438 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4444 #endif /* AVCODEC_AVCODEC_H */