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,
301 /* various PCM "codecs" */
302 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
303 AV_CODEC_ID_PCM_S16LE = 0x10000,
304 AV_CODEC_ID_PCM_S16BE,
305 AV_CODEC_ID_PCM_U16LE,
306 AV_CODEC_ID_PCM_U16BE,
309 AV_CODEC_ID_PCM_MULAW,
310 AV_CODEC_ID_PCM_ALAW,
311 AV_CODEC_ID_PCM_S32LE,
312 AV_CODEC_ID_PCM_S32BE,
313 AV_CODEC_ID_PCM_U32LE,
314 AV_CODEC_ID_PCM_U32BE,
315 AV_CODEC_ID_PCM_S24LE,
316 AV_CODEC_ID_PCM_S24BE,
317 AV_CODEC_ID_PCM_U24LE,
318 AV_CODEC_ID_PCM_U24BE,
319 AV_CODEC_ID_PCM_S24DAUD,
320 AV_CODEC_ID_PCM_ZORK,
321 AV_CODEC_ID_PCM_S16LE_PLANAR,
323 AV_CODEC_ID_PCM_F32BE,
324 AV_CODEC_ID_PCM_F32LE,
325 AV_CODEC_ID_PCM_F64BE,
326 AV_CODEC_ID_PCM_F64LE,
327 AV_CODEC_ID_PCM_BLURAY,
330 AV_CODEC_ID_PCM_S8_PLANAR,
331 AV_CODEC_ID_PCM_S24LE_PLANAR,
332 AV_CODEC_ID_PCM_S32LE_PLANAR,
334 /* various ADPCM codecs */
335 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
336 AV_CODEC_ID_ADPCM_IMA_WAV,
337 AV_CODEC_ID_ADPCM_IMA_DK3,
338 AV_CODEC_ID_ADPCM_IMA_DK4,
339 AV_CODEC_ID_ADPCM_IMA_WS,
340 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
341 AV_CODEC_ID_ADPCM_MS,
342 AV_CODEC_ID_ADPCM_4XM,
343 AV_CODEC_ID_ADPCM_XA,
344 AV_CODEC_ID_ADPCM_ADX,
345 AV_CODEC_ID_ADPCM_EA,
346 AV_CODEC_ID_ADPCM_G726,
347 AV_CODEC_ID_ADPCM_CT,
348 AV_CODEC_ID_ADPCM_SWF,
349 AV_CODEC_ID_ADPCM_YAMAHA,
350 AV_CODEC_ID_ADPCM_SBPRO_4,
351 AV_CODEC_ID_ADPCM_SBPRO_3,
352 AV_CODEC_ID_ADPCM_SBPRO_2,
353 AV_CODEC_ID_ADPCM_THP,
354 AV_CODEC_ID_ADPCM_IMA_AMV,
355 AV_CODEC_ID_ADPCM_EA_R1,
356 AV_CODEC_ID_ADPCM_EA_R3,
357 AV_CODEC_ID_ADPCM_EA_R2,
358 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
359 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
360 AV_CODEC_ID_ADPCM_EA_XAS,
361 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
362 AV_CODEC_ID_ADPCM_IMA_ISS,
363 AV_CODEC_ID_ADPCM_G722,
364 AV_CODEC_ID_ADPCM_IMA_APC,
365 AV_CODEC_ID_ADPCM_VIMA,
368 AV_CODEC_ID_AMR_NB = 0x12000,
371 /* RealAudio codecs*/
372 AV_CODEC_ID_RA_144 = 0x13000,
375 /* various DPCM codecs */
376 AV_CODEC_ID_ROQ_DPCM = 0x14000,
377 AV_CODEC_ID_INTERPLAY_DPCM,
378 AV_CODEC_ID_XAN_DPCM,
379 AV_CODEC_ID_SOL_DPCM,
382 AV_CODEC_ID_MP2 = 0x15000,
383 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
393 AV_CODEC_ID_VMDAUDIO,
399 AV_CODEC_ID_WESTWOOD_SND1,
400 AV_CODEC_ID_GSM, ///< as in Berlin toast format
403 AV_CODEC_ID_TRUESPEECH,
405 AV_CODEC_ID_SMACKAUDIO,
408 AV_CODEC_ID_DSICINAUDIO,
410 AV_CODEC_ID_MUSEPACK7,
412 AV_CODEC_ID_GSM_MS, /* as found in WAV */
418 AV_CODEC_ID_NELLYMOSER,
419 AV_CODEC_ID_MUSEPACK8,
421 AV_CODEC_ID_WMAVOICE,
423 AV_CODEC_ID_WMALOSSLESS,
432 AV_CODEC_ID_BINKAUDIO_RDFT,
433 AV_CODEC_ID_BINKAUDIO_DCT,
434 AV_CODEC_ID_AAC_LATM,
439 AV_CODEC_ID_8SVX_EXP,
440 AV_CODEC_ID_8SVX_FIB,
441 AV_CODEC_ID_BMV_AUDIO,
446 AV_CODEC_ID_COMFORT_NOISE,
448 AV_CODEC_ID_METASOUND,
449 AV_CODEC_ID_PAF_AUDIO,
453 /* subtitle codecs */
454 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
455 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
456 AV_CODEC_ID_DVB_SUBTITLE,
457 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
460 AV_CODEC_ID_MOV_TEXT,
461 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
462 AV_CODEC_ID_DVB_TELETEXT,
465 /* other specific kind of codecs (generally used for attachments) */
466 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
467 AV_CODEC_ID_TTF = 0x18000,
469 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
471 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
472 * stream (only used by libavformat) */
473 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
474 * stream (only used by libavformat) */
475 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
479 * This struct describes the properties of a single codec described by an
481 * @see avcodec_descriptor_get()
483 typedef struct AVCodecDescriptor {
485 enum AVMediaType type;
487 * Name of the codec described by this descriptor. It is non-empty and
488 * unique for each codec descriptor. It should contain alphanumeric
489 * characters and '_' only.
493 * A more descriptive name for this codec. May be NULL.
495 const char *long_name;
497 * Codec properties, a combination of AV_CODEC_PROP_* flags.
503 * Codec uses only intra compression.
506 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
508 * Codec supports lossy compression. Audio and video codecs only.
509 * @note a codec may support both lossy and lossless
512 #define AV_CODEC_PROP_LOSSY (1 << 1)
514 * Codec supports lossless compression. Audio and video codecs only.
516 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
518 * Codec supports frame reordering. That is, the coded order (the order in which
519 * the encoded packets are output by the encoders / stored / input to the
520 * decoders) may be different from the presentation order of the corresponding
523 * For codecs that do not have this property set, PTS and DTS should always be
526 #define AV_CODEC_PROP_REORDER (1 << 3)
529 * @ingroup lavc_decoding
530 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
531 * This is mainly needed because some optimized bitstream readers read
532 * 32 or 64 bit at once and could read over the end.<br>
533 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
534 * MPEG bitstreams could cause overread and segfault.
536 #define FF_INPUT_BUFFER_PADDING_SIZE 8
539 * @ingroup lavc_encoding
540 * minimum encoding buffer size
541 * Used to avoid some checks during header writing.
543 #define FF_MIN_BUFFER_SIZE 16384
547 * @ingroup lavc_encoding
548 * motion estimation type.
551 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
555 ME_EPZS, ///< enhanced predictive zonal search
556 ME_X1, ///< reserved for experiments
557 ME_HEX, ///< hexagon based search
558 ME_UMH, ///< uneven multi-hexagon search
559 ME_TESA, ///< transformed exhaustive search algorithm
563 * @ingroup lavc_decoding
566 /* We leave some space between them for extensions (drop some
567 * keyframes for intra-only or drop just some bidir frames). */
568 AVDISCARD_NONE =-16, ///< discard nothing
569 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
570 AVDISCARD_NONREF = 8, ///< discard all non reference
571 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
572 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
573 AVDISCARD_ALL = 48, ///< discard all
576 enum AVAudioServiceType {
577 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
578 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
579 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
580 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
581 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
582 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
583 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
584 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
585 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
586 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
590 * @ingroup lavc_encoding
592 typedef struct RcOverride{
595 int qscale; // If this is 0 then quality_factor will be used instead.
596 float quality_factor;
599 #if FF_API_MAX_BFRAMES
601 * @deprecated there is no libavcodec-wide limit on the number of B-frames
603 #define FF_MAX_B_FRAMES 16
607 These flags can be passed in AVCodecContext.flags before initialization.
608 Note: Not everything is supported yet.
612 * Allow decoders to produce frames with data planes that are not aligned
613 * to CPU requirements (e.g. due to cropping).
615 #define CODEC_FLAG_UNALIGNED 0x0001
616 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
617 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
618 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
619 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
622 * @deprecated use the "gmc" private option of the libxvid encoder
624 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
628 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
631 #define CODEC_FLAG_MV0 0x0040
633 #if FF_API_INPUT_PRESERVED
635 * @deprecated passing reference-counted frames to the encoders replaces this
638 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
640 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
641 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
642 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
645 * @deprecated edges are not used/required anymore. I.e. this flag is now always
648 #define CODEC_FLAG_EMU_EDGE 0x4000
650 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
651 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
652 location instead of only at frame boundaries. */
653 #if FF_API_NORMALIZE_AQP
655 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
658 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
660 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
661 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
662 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
663 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
664 /* Fx : Flag for h263+ extra options */
665 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
666 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
667 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
668 #define CODEC_FLAG_CLOSED_GOP 0x80000000
669 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
670 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
671 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
672 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
674 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
676 /* Unsupported options :
677 * Syntax Arithmetic coding (SAC)
678 * Reference Picture Selection
679 * Independent Segment Decoding */
681 /* codec capabilities */
683 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
685 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
686 * If not set, it might not use get_buffer() at all or use operations that
687 * assume the buffer was allocated by avcodec_default_get_buffer.
689 #define CODEC_CAP_DR1 0x0002
690 #define CODEC_CAP_TRUNCATED 0x0008
692 /* Codec can export data for HW decoding (XvMC). */
693 #define CODEC_CAP_HWACCEL 0x0010
694 #endif /* FF_API_XVMC */
696 * Encoder or decoder requires flushing with NULL input at the end in order to
697 * give the complete and correct output.
699 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
700 * with NULL data. The user can still send NULL data to the public encode
701 * or decode function, but libavcodec will not pass it along to the codec
702 * unless this flag is set.
705 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
706 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
710 * The encoder needs to be fed with NULL data at the end of encoding until the
711 * encoder no longer returns data.
713 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
714 * flag also means that the encoder must set the pts and duration for
715 * each output packet. If this flag is not set, the pts and duration will
716 * be determined by libavcodec from the input frame.
718 #define CODEC_CAP_DELAY 0x0020
720 * Codec can be fed a final frame with a smaller size.
721 * This can be used to prevent truncation of the last audio samples.
723 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
726 * Codec can export data for HW decoding (VDPAU).
728 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
731 * Codec can output multiple frames per AVPacket
732 * Normally demuxers return one frame at a time, demuxers which do not do
733 * are connected to a parser to split what they return into proper frames.
734 * This flag is reserved to the very rare category of codecs which have a
735 * bitstream that cannot be split into frames without timeconsuming
736 * operations like full decoding. Demuxers carring such bitstreams thus
737 * may return multiple frames in a packet. This has many disadvantages like
738 * prohibiting stream copy in many cases thus it should only be considered
741 #define CODEC_CAP_SUBFRAMES 0x0100
743 * Codec is experimental and is thus avoided in favor of non experimental
746 #define CODEC_CAP_EXPERIMENTAL 0x0200
748 * Codec should fill in channel configuration and samplerate instead of container
750 #define CODEC_CAP_CHANNEL_CONF 0x0400
751 #if FF_API_NEG_LINESIZES
753 * @deprecated no codecs use this capability
755 #define CODEC_CAP_NEG_LINESIZES 0x0800
758 * Codec supports frame-level multithreading.
760 #define CODEC_CAP_FRAME_THREADS 0x1000
762 * Codec supports slice-based (or partition-based) multithreading.
764 #define CODEC_CAP_SLICE_THREADS 0x2000
766 * Codec supports changed parameters at any point.
768 #define CODEC_CAP_PARAM_CHANGE 0x4000
770 * Codec supports avctx->thread_count == 0 (auto).
772 #define CODEC_CAP_AUTO_THREADS 0x8000
774 * Audio encoder supports receiving a different number of samples in each call.
776 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
779 //The following defines may change, don't expect compatibility if you use them.
780 #define MB_TYPE_INTRA4x4 0x0001
781 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
782 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
783 #define MB_TYPE_16x16 0x0008
784 #define MB_TYPE_16x8 0x0010
785 #define MB_TYPE_8x16 0x0020
786 #define MB_TYPE_8x8 0x0040
787 #define MB_TYPE_INTERLACED 0x0080
788 #define MB_TYPE_DIRECT2 0x0100 //FIXME
789 #define MB_TYPE_ACPRED 0x0200
790 #define MB_TYPE_GMC 0x0400
791 #define MB_TYPE_SKIP 0x0800
792 #define MB_TYPE_P0L0 0x1000
793 #define MB_TYPE_P1L0 0x2000
794 #define MB_TYPE_P0L1 0x4000
795 #define MB_TYPE_P1L1 0x8000
796 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
797 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
798 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
799 #define MB_TYPE_QUANT 0x00010000
800 #define MB_TYPE_CBP 0x00020000
801 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
806 * This specifies the area which should be displayed.
807 * Note there may be multiple such areas for one frame.
809 typedef struct AVPanScan{
812 * - encoding: Set by user.
813 * - decoding: Set by libavcodec.
818 * width and height in 1/16 pel
819 * - encoding: Set by user.
820 * - decoding: Set by libavcodec.
826 * position of the top left corner in 1/16 pel for up to 3 fields/frames
827 * - encoding: Set by user.
828 * - decoding: Set by libavcodec.
830 int16_t position[3][2];
833 #if FF_API_QSCALE_TYPE
834 #define FF_QSCALE_TYPE_MPEG1 0
835 #define FF_QSCALE_TYPE_MPEG2 1
836 #define FF_QSCALE_TYPE_H264 2
837 #define FF_QSCALE_TYPE_VP56 3
840 #if FF_API_GET_BUFFER
841 #define FF_BUFFER_TYPE_INTERNAL 1
842 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
843 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
844 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
846 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
847 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
848 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
849 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
853 * The decoder will keep a reference to the frame and may reuse it later.
855 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
858 * @defgroup lavc_packet AVPacket
860 * Types and functions for working with AVPacket.
863 enum AVPacketSideDataType {
865 AV_PKT_DATA_NEW_EXTRADATA,
868 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
871 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
872 * s32le channel_count
873 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
874 * u64le channel_layout
875 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
877 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
882 AV_PKT_DATA_PARAM_CHANGE,
885 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
886 * structures with info about macroblocks relevant to splitting the
887 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
888 * That is, it does not necessarily contain info about all macroblocks,
889 * as long as the distance between macroblocks in the info is smaller
890 * than the target payload size.
891 * Each MB info structure is 12 bytes, and is laid out as follows:
893 * u32le bit offset from the start of the packet
894 * u8 current quantizer at the start of the macroblock
896 * u16le macroblock address within the GOB
897 * u8 horizontal MV predictor
898 * u8 vertical MV predictor
899 * u8 horizontal MV predictor for block number 3
900 * u8 vertical MV predictor for block number 3
903 AV_PKT_DATA_H263_MB_INFO,
906 * This side data should be associated with an audio stream and contains
907 * ReplayGain information in form of the AVReplayGain struct.
909 AV_PKT_DATA_REPLAYGAIN,
912 * This side data contains a 3x3 transformation matrix describing an affine
913 * transformation that needs to be applied to the decoded video frames for
914 * correct presentation.
916 * See libavutil/display.h for a detailed description of the data.
918 AV_PKT_DATA_DISPLAYMATRIX,
921 * This side data should be associated with a video stream and contains
922 * Stereoscopic 3D information in form of the AVStereo3D struct.
924 AV_PKT_DATA_STEREO3D,
927 * This side data should be associated with an audio stream and corresponds
928 * to enum AVAudioServiceType.
930 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
933 typedef struct AVPacketSideData {
936 enum AVPacketSideDataType type;
940 * This structure stores compressed data. It is typically exported by demuxers
941 * and then passed as input to decoders, or received as output from encoders and
942 * then passed to muxers.
944 * For video, it should typically contain one compressed frame. For audio it may
945 * contain several compressed frames.
947 * AVPacket is one of the few structs in Libav, whose size is a part of public
948 * ABI. Thus it may be allocated on stack and no new fields can be added to it
949 * without libavcodec and libavformat major bump.
951 * The semantics of data ownership depends on the buf or destruct (deprecated)
952 * fields. If either is set, the packet data is dynamically allocated and is
953 * valid indefinitely until av_free_packet() is called (which in turn calls
954 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
955 * the packet data is typically backed by some static buffer somewhere and is
956 * only valid for a limited time (e.g. until the next read call when demuxing).
958 * The side data is always allocated with av_malloc() and is freed in
961 typedef struct AVPacket {
963 * A reference to the reference-counted buffer where the packet data is
965 * May be NULL, then the packet data is not reference-counted.
969 * Presentation timestamp in AVStream->time_base units; the time at which
970 * the decompressed packet will be presented to the user.
971 * Can be AV_NOPTS_VALUE if it is not stored in the file.
972 * pts MUST be larger or equal to dts as presentation cannot happen before
973 * decompression, unless one wants to view hex dumps. Some formats misuse
974 * the terms dts and pts/cts to mean something different. Such timestamps
975 * must be converted to true pts/dts before they are stored in AVPacket.
979 * Decompression timestamp in AVStream->time_base units; the time at which
980 * the packet is decompressed.
981 * Can be AV_NOPTS_VALUE if it is not stored in the file.
988 * A combination of AV_PKT_FLAG values
992 * Additional packet data that can be provided by the container.
993 * Packet can contain several types of side information.
995 AVPacketSideData *side_data;
999 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1000 * Equals next_pts - this_pts in presentation order.
1003 #if FF_API_DESTRUCT_PACKET
1004 attribute_deprecated
1005 void (*destruct)(struct AVPacket *);
1006 attribute_deprecated
1009 int64_t pos; ///< byte position in stream, -1 if unknown
1012 * Time difference in AVStream->time_base units from the pts of this
1013 * packet to the point at which the output from the decoder has converged
1014 * independent from the availability of previous frames. That is, the
1015 * frames are virtually identical no matter if decoding started from
1016 * the very first frame or from this keyframe.
1017 * Is AV_NOPTS_VALUE if unknown.
1018 * This field is not the display duration of the current packet.
1019 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1022 * The purpose of this field is to allow seeking in streams that have no
1023 * keyframes in the conventional sense. It corresponds to the
1024 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1025 * essential for some types of subtitle streams to ensure that all
1026 * subtitles are correctly displayed after seeking.
1028 int64_t convergence_duration;
1030 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1031 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1033 enum AVSideDataParamChangeFlags {
1034 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1035 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1036 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1037 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1043 struct AVCodecInternal;
1047 AV_FIELD_PROGRESSIVE,
1048 AV_FIELD_TT, //< Top coded_first, top displayed first
1049 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1050 AV_FIELD_TB, //< Top coded first, bottom displayed first
1051 AV_FIELD_BT, //< Bottom coded first, top displayed first
1055 * main external API structure.
1056 * New fields can be added to the end with minor version bumps.
1057 * Removal, reordering and changes to existing fields require a major
1059 * sizeof(AVCodecContext) must not be used outside libav*.
1061 typedef struct AVCodecContext {
1063 * information on struct for av_log
1064 * - set by avcodec_alloc_context3
1066 const AVClass *av_class;
1067 int log_level_offset;
1069 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1070 const struct AVCodec *codec;
1071 #if FF_API_CODEC_NAME
1073 * @deprecated this field is not used for anything in libavcodec
1075 attribute_deprecated
1076 char codec_name[32];
1078 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1081 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1082 * This is used to work around some encoder bugs.
1083 * A demuxer should set this to what is stored in the field used to identify the codec.
1084 * If there are multiple such fields in a container then the demuxer should choose the one
1085 * which maximizes the information about the used codec.
1086 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1087 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1088 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1090 * - encoding: Set by user, if not then the default based on codec_id will be used.
1091 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1093 unsigned int codec_tag;
1095 #if FF_API_STREAM_CODEC_TAG
1097 * @deprecated this field is unused
1099 attribute_deprecated
1100 unsigned int stream_codec_tag;
1106 * Private context used for internal data.
1108 * Unlike priv_data, this is not codec-specific. It is used in general
1109 * libavcodec functions.
1111 struct AVCodecInternal *internal;
1114 * Private data of the user, can be used to carry app specific stuff.
1115 * - encoding: Set by user.
1116 * - decoding: Set by user.
1121 * the average bitrate
1122 * - encoding: Set by user; unused for constant quantizer encoding.
1123 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1128 * number of bits the bitstream is allowed to diverge from the reference.
1129 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1130 * - encoding: Set by user; unused for constant quantizer encoding.
1131 * - decoding: unused
1133 int bit_rate_tolerance;
1136 * Global quality for codecs which cannot change it per frame.
1137 * This should be proportional to MPEG-1/2/4 qscale.
1138 * - encoding: Set by user.
1139 * - decoding: unused
1144 * - encoding: Set by user.
1145 * - decoding: unused
1147 int compression_level;
1148 #define FF_COMPRESSION_DEFAULT -1
1152 * - encoding: Set by user.
1153 * - decoding: Set by user.
1159 * - encoding: Set by user.
1160 * - decoding: Set by user.
1165 * some codecs need / can use extradata like Huffman tables.
1166 * mjpeg: Huffman tables
1167 * rv10: additional flags
1168 * mpeg4: global headers (they can be in the bitstream or here)
1169 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1170 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1171 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1172 * - encoding: Set/allocated/freed by libavcodec.
1173 * - decoding: Set/allocated/freed by user.
1179 * This is the fundamental unit of time (in seconds) in terms
1180 * of which frame timestamps are represented. For fixed-fps content,
1181 * timebase should be 1/framerate and timestamp increments should be
1183 * - encoding: MUST be set by user.
1184 * - decoding: the use of this field for decoding is deprecated.
1185 * Use framerate instead.
1187 AVRational time_base;
1190 * For some codecs, the time base is closer to the field rate than the frame rate.
1191 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1192 * if no telecine is used ...
1194 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1196 int ticks_per_frame;
1202 * Number of frames the decoded output will be delayed relative to the
1206 * For encoding, this field is unused (see initial_padding).
1208 * For decoding, this is the number of samples the decoder needs to
1209 * output before the decoder's output is valid. When seeking, you should
1210 * start decoding this many samples prior to your desired seek point.
1212 * - encoding: Set by libavcodec.
1213 * - decoding: Set by libavcodec.
1220 * picture width / height.
1222 * @note Those fields may not match the values of the last
1223 * AVFrame outputted by avcodec_decode_video2 due frame
1226 * - encoding: MUST be set by user.
1227 * - decoding: May be set by the user before opening the decoder if known e.g.
1228 * from the container. Some decoders will require the dimensions
1229 * to be set by the caller. During decoding, the decoder may
1230 * overwrite those values as required while parsing the data.
1235 * Bitstream width / height, may be different from width/height e.g. when
1236 * the decoded frame is cropped before being output.
1238 * @note Those field may not match the value of the last
1239 * AVFrame outputted by avcodec_decode_video2 due frame
1242 * - encoding: unused
1243 * - decoding: May be set by the user before opening the decoder if known
1244 * e.g. from the container. During decoding, the decoder may
1245 * overwrite those values as required while parsing the data.
1247 int coded_width, coded_height;
1249 #if FF_API_ASPECT_EXTENDED
1250 #define FF_ASPECT_EXTENDED 15
1254 * the number of pictures in a group of pictures, or 0 for intra_only
1255 * - encoding: Set by user.
1256 * - decoding: unused
1261 * Pixel format, see AV_PIX_FMT_xxx.
1262 * May be set by the demuxer if known from headers.
1263 * May be overriden by the decoder if it knows better.
1265 * @note This field may not match the value of the last
1266 * AVFrame outputted by avcodec_decode_video2 due frame
1269 * - encoding: Set by user.
1270 * - decoding: Set by user if known, overridden by libavcodec while
1273 enum AVPixelFormat pix_fmt;
1276 * Motion estimation algorithm used for video coding.
1277 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1278 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1279 * - encoding: MUST be set by user.
1280 * - decoding: unused
1285 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1286 * decoder to draw a horizontal band. It improves cache usage. Not
1287 * all codecs can do that. You must check the codec capabilities
1289 * When multithreading is used, it may be called from multiple threads
1290 * at the same time; threads might draw different parts of the same AVFrame,
1291 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1293 * The function is also used by hardware acceleration APIs.
1294 * It is called at least once during frame decoding to pass
1295 * the data needed for hardware render.
1296 * In that mode instead of pixel data, AVFrame points to
1297 * a structure specific to the acceleration API. The application
1298 * reads the structure and can change some fields to indicate progress
1300 * - encoding: unused
1301 * - decoding: Set by user.
1302 * @param height the height of the slice
1303 * @param y the y position of the slice
1304 * @param type 1->top field, 2->bottom field, 3->frame
1305 * @param offset offset into the AVFrame.data from which the slice should be read
1307 void (*draw_horiz_band)(struct AVCodecContext *s,
1308 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1309 int y, int type, int height);
1312 * callback to negotiate the pixelFormat
1313 * @param fmt is the list of formats which are supported by the codec,
1314 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1315 * The first is always the native one.
1316 * @note The callback may be called again immediately if initialization for
1317 * the selected (hardware-accelerated) pixel format failed.
1318 * @warning Behavior is undefined if the callback returns a value not
1319 * in the fmt list of formats.
1320 * @return the chosen format
1321 * - encoding: unused
1322 * - decoding: Set by user, if not set the native format will be chosen.
1324 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1327 * maximum number of B-frames between non-B-frames
1328 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1329 * - encoding: Set by user.
1330 * - decoding: unused
1335 * qscale factor between IP and B-frames
1336 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1337 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1338 * - encoding: Set by user.
1339 * - decoding: unused
1341 float b_quant_factor;
1343 /** obsolete FIXME remove */
1345 #define FF_RC_STRATEGY_XVID 1
1347 int b_frame_strategy;
1350 * qscale offset between IP and B-frames
1351 * - encoding: Set by user.
1352 * - decoding: unused
1354 float b_quant_offset;
1357 * Size of the frame reordering buffer in the decoder.
1358 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1359 * - encoding: Set by libavcodec.
1360 * - decoding: Set by libavcodec.
1365 * 0-> h263 quant 1-> mpeg quant
1366 * - encoding: Set by user.
1367 * - decoding: unused
1372 * qscale factor between P and I-frames
1373 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1374 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1375 * - encoding: Set by user.
1376 * - decoding: unused
1378 float i_quant_factor;
1381 * qscale offset between P and I-frames
1382 * - encoding: Set by user.
1383 * - decoding: unused
1385 float i_quant_offset;
1388 * luminance masking (0-> disabled)
1389 * - encoding: Set by user.
1390 * - decoding: unused
1395 * temporary complexity masking (0-> disabled)
1396 * - encoding: Set by user.
1397 * - decoding: unused
1399 float temporal_cplx_masking;
1402 * spatial complexity masking (0-> disabled)
1403 * - encoding: Set by user.
1404 * - decoding: unused
1406 float spatial_cplx_masking;
1409 * p block masking (0-> disabled)
1410 * - encoding: Set by user.
1411 * - decoding: unused
1416 * darkness masking (0-> disabled)
1417 * - encoding: Set by user.
1418 * - decoding: unused
1424 * - encoding: Set by libavcodec.
1425 * - decoding: Set by user (or 0).
1429 * prediction method (needed for huffyuv)
1430 * - encoding: Set by user.
1431 * - decoding: unused
1433 int prediction_method;
1434 #define FF_PRED_LEFT 0
1435 #define FF_PRED_PLANE 1
1436 #define FF_PRED_MEDIAN 2
1439 * slice offsets in the frame in bytes
1440 * - encoding: Set/allocated by libavcodec.
1441 * - decoding: Set/allocated by user (or NULL).
1446 * sample aspect ratio (0 if unknown)
1447 * That is the width of a pixel divided by the height of the pixel.
1448 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1449 * - encoding: Set by user.
1450 * - decoding: Set by libavcodec.
1452 AVRational sample_aspect_ratio;
1455 * motion estimation comparison function
1456 * - encoding: Set by user.
1457 * - decoding: unused
1461 * subpixel motion estimation comparison function
1462 * - encoding: Set by user.
1463 * - decoding: unused
1467 * macroblock comparison function (not supported yet)
1468 * - encoding: Set by user.
1469 * - decoding: unused
1473 * interlaced DCT comparison function
1474 * - encoding: Set by user.
1475 * - decoding: unused
1478 #define FF_CMP_SAD 0
1479 #define FF_CMP_SSE 1
1480 #define FF_CMP_SATD 2
1481 #define FF_CMP_DCT 3
1482 #define FF_CMP_PSNR 4
1483 #define FF_CMP_BIT 5
1485 #define FF_CMP_ZERO 7
1486 #define FF_CMP_VSAD 8
1487 #define FF_CMP_VSSE 9
1488 #define FF_CMP_NSSE 10
1489 #define FF_CMP_DCTMAX 13
1490 #define FF_CMP_DCT264 14
1491 #define FF_CMP_CHROMA 256
1494 * ME diamond size & shape
1495 * - encoding: Set by user.
1496 * - decoding: unused
1501 * amount of previous MV predictors (2a+1 x 2a+1 square)
1502 * - encoding: Set by user.
1503 * - decoding: unused
1505 int last_predictor_count;
1508 * prepass for motion estimation
1509 * - encoding: Set by user.
1510 * - decoding: unused
1515 * motion estimation prepass comparison function
1516 * - encoding: Set by user.
1517 * - decoding: unused
1522 * ME prepass diamond size & shape
1523 * - encoding: Set by user.
1524 * - decoding: unused
1530 * - encoding: Set by user.
1531 * - decoding: unused
1533 int me_subpel_quality;
1537 * DTG active format information (additional aspect ratio
1538 * information only used in DVB MPEG-2 transport streams)
1541 * - encoding: unused
1542 * - decoding: Set by decoder.
1543 * @deprecated Deprecated in favor of AVSideData
1545 attribute_deprecated int dtg_active_format;
1546 #define FF_DTG_AFD_SAME 8
1547 #define FF_DTG_AFD_4_3 9
1548 #define FF_DTG_AFD_16_9 10
1549 #define FF_DTG_AFD_14_9 11
1550 #define FF_DTG_AFD_4_3_SP_14_9 13
1551 #define FF_DTG_AFD_16_9_SP_14_9 14
1552 #define FF_DTG_AFD_SP_4_3 15
1553 #endif /* FF_API_AFD */
1556 * maximum motion estimation search range in subpel units
1557 * If 0 then no limit.
1559 * - encoding: Set by user.
1560 * - decoding: unused
1565 * intra quantizer bias
1566 * - encoding: Set by user.
1567 * - decoding: unused
1569 int intra_quant_bias;
1570 #define FF_DEFAULT_QUANT_BIAS 999999
1573 * inter quantizer bias
1574 * - encoding: Set by user.
1575 * - decoding: unused
1577 int inter_quant_bias;
1581 * - encoding: unused
1582 * - decoding: Set by user.
1585 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1586 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1587 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1591 * XVideo Motion Acceleration
1592 * - encoding: forbidden
1593 * - decoding: set by decoder
1594 * @deprecated XvMC support is slated for removal.
1596 attribute_deprecated int xvmc_acceleration;
1597 #endif /* FF_API_XVMC */
1600 * macroblock decision mode
1601 * - encoding: Set by user.
1602 * - decoding: unused
1605 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1606 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1607 #define FF_MB_DECISION_RD 2 ///< rate distortion
1610 * custom intra quantization matrix
1611 * - encoding: Set by user, can be NULL.
1612 * - decoding: Set by libavcodec.
1614 uint16_t *intra_matrix;
1617 * custom inter quantization matrix
1618 * - encoding: Set by user, can be NULL.
1619 * - decoding: Set by libavcodec.
1621 uint16_t *inter_matrix;
1624 * scene change detection threshold
1625 * 0 is default, larger means fewer detected scene changes.
1626 * - encoding: Set by user.
1627 * - decoding: unused
1629 int scenechange_threshold;
1632 * noise reduction strength
1633 * - encoding: Set by user.
1634 * - decoding: unused
1636 int noise_reduction;
1640 * @deprecated this field is unused
1642 attribute_deprecated
1646 * @deprecated this field is unused
1648 attribute_deprecated
1653 * precision of the intra DC coefficient - 8
1654 * - encoding: Set by user.
1655 * - decoding: unused
1657 int intra_dc_precision;
1660 * Number of macroblock rows at the top which are skipped.
1661 * - encoding: unused
1662 * - decoding: Set by user.
1667 * Number of macroblock rows at the bottom which are skipped.
1668 * - encoding: unused
1669 * - decoding: Set by user.
1675 * @deprecated use encoder private options instead
1677 attribute_deprecated
1678 float border_masking;
1682 * minimum MB lagrange multipler
1683 * - encoding: Set by user.
1684 * - decoding: unused
1689 * maximum MB lagrange multipler
1690 * - encoding: Set by user.
1691 * - decoding: unused
1697 * - encoding: Set by user.
1698 * - decoding: unused
1700 int me_penalty_compensation;
1704 * - encoding: Set by user.
1705 * - decoding: unused
1711 * - encoding: Set by user.
1712 * - decoding: unused
1718 * - encoding: Set by user.
1719 * - decoding: unused
1724 * number of reference frames
1725 * - encoding: Set by user.
1726 * - decoding: Set by lavc.
1731 * chroma qp offset from luma
1732 * - encoding: Set by user.
1733 * - decoding: unused
1737 #if FF_API_UNUSED_MEMBERS
1739 * Multiplied by qscale for each frame and added to scene_change_score.
1740 * - encoding: Set by user.
1741 * - decoding: unused
1743 attribute_deprecated int scenechange_factor;
1748 * Note: Value depends upon the compare function used for fullpel ME.
1749 * - encoding: Set by user.
1750 * - decoding: unused
1755 * Adjust sensitivity of b_frame_strategy 1.
1756 * - encoding: Set by user.
1757 * - decoding: unused
1762 * Chromaticity coordinates of the source primaries.
1763 * - encoding: Set by user
1764 * - decoding: Set by libavcodec
1766 enum AVColorPrimaries color_primaries;
1769 * Color Transfer Characteristic.
1770 * - encoding: Set by user
1771 * - decoding: Set by libavcodec
1773 enum AVColorTransferCharacteristic color_trc;
1776 * YUV colorspace type.
1777 * - encoding: Set by user
1778 * - decoding: Set by libavcodec
1780 enum AVColorSpace colorspace;
1783 * MPEG vs JPEG YUV range.
1784 * - encoding: Set by user
1785 * - decoding: Set by libavcodec
1787 enum AVColorRange color_range;
1790 * This defines the location of chroma samples.
1791 * - encoding: Set by user
1792 * - decoding: Set by libavcodec
1794 enum AVChromaLocation chroma_sample_location;
1798 * Indicates number of picture subdivisions. Used for parallelized
1800 * - encoding: Set by user
1801 * - decoding: unused
1806 * - encoding: set by libavcodec
1807 * - decoding: Set by libavcodec
1809 enum AVFieldOrder field_order;
1812 int sample_rate; ///< samples per second
1813 int channels; ///< number of audio channels
1816 * audio sample format
1817 * - encoding: Set by user.
1818 * - decoding: Set by libavcodec.
1820 enum AVSampleFormat sample_fmt; ///< sample format
1822 /* The following data should not be initialized. */
1824 * Number of samples per channel in an audio frame.
1826 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1827 * except the last must contain exactly frame_size samples per channel.
1828 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1829 * frame size is not restricted.
1830 * - decoding: may be set by some decoders to indicate constant frame size
1835 * Frame counter, set by libavcodec.
1837 * - decoding: total number of frames returned from the decoder so far.
1838 * - encoding: total number of frames passed to the encoder so far.
1840 * @note the counter is not incremented if encoding/decoding resulted in
1846 * number of bytes per packet if constant and known or 0
1847 * Used by some WAV based audio codecs.
1852 * Audio cutoff bandwidth (0 means "automatic")
1853 * - encoding: Set by user.
1854 * - decoding: unused
1858 #if FF_API_REQUEST_CHANNELS
1860 * Decoder should decode to this many channels if it can (0 for default)
1861 * - encoding: unused
1862 * - decoding: Set by user.
1863 * @deprecated Deprecated in favor of request_channel_layout.
1865 attribute_deprecated int request_channels;
1869 * Audio channel layout.
1870 * - encoding: set by user.
1871 * - decoding: set by libavcodec.
1873 uint64_t channel_layout;
1876 * Request decoder to use this channel layout if it can (0 for default)
1877 * - encoding: unused
1878 * - decoding: Set by user.
1880 uint64_t request_channel_layout;
1883 * Type of service that the audio stream conveys.
1884 * - encoding: Set by user.
1885 * - decoding: Set by libavcodec.
1887 enum AVAudioServiceType audio_service_type;
1890 * Used to request a sample format from the decoder.
1891 * - encoding: unused.
1892 * - decoding: Set by user.
1894 enum AVSampleFormat request_sample_fmt;
1896 #if FF_API_GET_BUFFER
1898 * Called at the beginning of each frame to get a buffer for it.
1900 * The function will set AVFrame.data[], AVFrame.linesize[].
1901 * AVFrame.extended_data[] must also be set, but it should be the same as
1902 * AVFrame.data[] except for planar audio with more channels than can fit
1903 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1904 * many data pointers as it can hold.
1906 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1907 * avcodec_default_get_buffer() instead of providing buffers allocated by
1910 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1911 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1912 * but if get_buffer() is overridden then alignment considerations should
1913 * be taken into account.
1915 * @see avcodec_default_get_buffer()
1919 * If pic.reference is set then the frame will be read later by libavcodec.
1920 * avcodec_align_dimensions2() should be used to find the required width and
1921 * height, as they normally need to be rounded up to the next multiple of 16.
1923 * If frame multithreading is used and thread_safe_callbacks is set,
1924 * it may be called from a different thread, but not from more than one at
1925 * once. Does not need to be reentrant.
1927 * @see release_buffer(), reget_buffer()
1928 * @see avcodec_align_dimensions2()
1932 * Decoders request a buffer of a particular size by setting
1933 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1934 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1935 * to a smaller value in the output frame.
1937 * Decoders cannot use the buffer after returning from
1938 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1939 * is assumed to be released immediately upon return. In some rare cases,
1940 * a decoder may need to call get_buffer() more than once in a single
1941 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1942 * called again after it has already been called once, the previously
1943 * acquired buffer is assumed to be released at that time and may not be
1944 * reused by the decoder.
1946 * As a convenience, av_samples_get_buffer_size() and
1947 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1948 * functions to find the required data size and to fill data pointers and
1949 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1950 * since all planes must be the same size.
1952 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1954 * - encoding: unused
1955 * - decoding: Set by libavcodec, user can override.
1957 * @deprecated use get_buffer2()
1959 attribute_deprecated
1960 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1963 * Called to release buffers which were allocated with get_buffer.
1964 * A released buffer can be reused in get_buffer().
1965 * pic.data[*] must be set to NULL.
1966 * May be called from a different thread if frame multithreading is used,
1967 * but not by more than one thread at once, so does not need to be reentrant.
1968 * - encoding: unused
1969 * - decoding: Set by libavcodec, user can override.
1971 * @deprecated custom freeing callbacks should be set from get_buffer2()
1973 attribute_deprecated
1974 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1977 * Called at the beginning of a frame to get cr buffer for it.
1978 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1979 * libavcodec will pass previous buffer in pic, function should return
1980 * same buffer or new buffer with old frame "painted" into it.
1981 * If pic.data[0] == NULL must behave like get_buffer().
1982 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1983 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1985 * - encoding: unused
1986 * - decoding: Set by libavcodec, user can override.
1988 attribute_deprecated
1989 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1993 * This callback is called at the beginning of each frame to get data
1994 * buffer(s) for it. There may be one contiguous buffer for all the data or
1995 * there may be a buffer per each data plane or anything in between. What
1996 * this means is, you may set however many entries in buf[] you feel necessary.
1997 * Each buffer must be reference-counted using the AVBuffer API (see description
2000 * The following fields will be set in the frame before this callback is
2003 * - width, height (video only)
2004 * - sample_rate, channel_layout, nb_samples (audio only)
2005 * Their values may differ from the corresponding values in
2006 * AVCodecContext. This callback must use the frame values, not the codec
2007 * context values, to calculate the required buffer size.
2009 * This callback must fill the following fields in the frame:
2013 * * if the data is planar audio with more than 8 channels, then this
2014 * callback must allocate and fill extended_data to contain all pointers
2015 * to all data planes. data[] must hold as many pointers as it can.
2016 * extended_data must be allocated with av_malloc() and will be freed in
2018 * * otherwise exended_data must point to data
2019 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2020 * the frame's data and extended_data pointers must be contained in these. That
2021 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2022 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2023 * and av_buffer_ref().
2024 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2025 * this callback and filled with the extra buffers if there are more
2026 * buffers than buf[] can hold. extended_buf will be freed in
2029 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2030 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2033 * Each data plane must be aligned to the maximum required by the target
2036 * @see avcodec_default_get_buffer2()
2040 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2041 * (read and/or written to if it is writable) later by libavcodec.
2043 * avcodec_align_dimensions2() should be used to find the required width and
2044 * height, as they normally need to be rounded up to the next multiple of 16.
2046 * If frame multithreading is used and thread_safe_callbacks is set,
2047 * this callback may be called from a different thread, but not from more
2048 * than one at once. Does not need to be reentrant.
2050 * @see avcodec_align_dimensions2()
2054 * Decoders request a buffer of a particular size by setting
2055 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2056 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2057 * to a smaller value in the output frame.
2059 * As a convenience, av_samples_get_buffer_size() and
2060 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2061 * functions to find the required data size and to fill data pointers and
2062 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2063 * since all planes must be the same size.
2065 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2067 * - encoding: unused
2068 * - decoding: Set by libavcodec, user can override.
2070 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2073 * If non-zero, the decoded audio and video frames returned from
2074 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2075 * and are valid indefinitely. The caller must free them with
2076 * av_frame_unref() when they are not needed anymore.
2077 * Otherwise, the decoded frames must not be freed by the caller and are
2078 * only valid until the next decode call.
2080 * - encoding: unused
2081 * - decoding: set by the caller before avcodec_open2().
2083 int refcounted_frames;
2085 /* - encoding parameters */
2086 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2087 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2091 * - encoding: Set by user.
2092 * - decoding: unused
2098 * - encoding: Set by user.
2099 * - decoding: unused
2104 * maximum quantizer difference between frames
2105 * - encoding: Set by user.
2106 * - decoding: unused
2112 * @deprecated use encoder private options instead
2114 attribute_deprecated
2117 attribute_deprecated
2119 attribute_deprecated
2124 * decoder bitstream buffer size
2125 * - encoding: Set by user.
2126 * - decoding: unused
2131 * ratecontrol override, see RcOverride
2132 * - encoding: Allocated/set/freed by user.
2133 * - decoding: unused
2135 int rc_override_count;
2136 RcOverride *rc_override;
2140 * @deprecated use encoder private options instead
2142 attribute_deprecated
2148 * - encoding: Set by user.
2149 * - decoding: unused
2155 * - encoding: Set by user.
2156 * - decoding: unused
2162 * @deprecated use encoder private options instead
2164 attribute_deprecated
2165 float rc_buffer_aggressivity;
2167 attribute_deprecated
2168 float rc_initial_cplx;
2172 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2173 * - encoding: Set by user.
2174 * - decoding: unused.
2176 float rc_max_available_vbv_use;
2179 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2180 * - encoding: Set by user.
2181 * - decoding: unused.
2183 float rc_min_vbv_overflow_use;
2186 * Number of bits which should be loaded into the rc buffer before decoding starts.
2187 * - encoding: Set by user.
2188 * - decoding: unused
2190 int rc_initial_buffer_occupancy;
2192 #define FF_CODER_TYPE_VLC 0
2193 #define FF_CODER_TYPE_AC 1
2194 #define FF_CODER_TYPE_RAW 2
2195 #define FF_CODER_TYPE_RLE 3
2196 #if FF_API_UNUSED_MEMBERS
2197 #define FF_CODER_TYPE_DEFLATE 4
2198 #endif /* FF_API_UNUSED_MEMBERS */
2201 * - encoding: Set by user.
2202 * - decoding: unused
2208 * - encoding: Set by user.
2209 * - decoding: unused
2215 * @deprecated use encoder private options instead
2217 attribute_deprecated
2221 * @deprecated use encoder private options instead
2223 attribute_deprecated
2228 * frame skip threshold
2229 * - encoding: Set by user.
2230 * - decoding: unused
2232 int frame_skip_threshold;
2236 * - encoding: Set by user.
2237 * - decoding: unused
2239 int frame_skip_factor;
2242 * frame skip exponent
2243 * - encoding: Set by user.
2244 * - decoding: unused
2249 * frame skip comparison function
2250 * - encoding: Set by user.
2251 * - decoding: unused
2256 * trellis RD quantization
2257 * - encoding: Set by user.
2258 * - decoding: unused
2263 * - encoding: Set by user.
2264 * - decoding: unused
2266 int min_prediction_order;
2269 * - encoding: Set by user.
2270 * - decoding: unused
2272 int max_prediction_order;
2275 * GOP timecode frame start number, in non drop frame format
2276 * - encoding: Set by user.
2277 * - decoding: unused
2279 int64_t timecode_frame_start;
2281 /* The RTP callback: This function is called */
2282 /* every time the encoder has a packet to send. */
2283 /* It depends on the encoder if the data starts */
2284 /* with a Start Code (it should). H.263 does. */
2285 /* mb_nb contains the number of macroblocks */
2286 /* encoded in the RTP payload. */
2287 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2289 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2290 /* do its best to deliver a chunk with size */
2291 /* below rtp_payload_size, the chunk will start */
2292 /* with a start code on some codecs like H.263. */
2293 /* This doesn't take account of any particular */
2294 /* headers inside the transmitted RTP payload. */
2296 /* statistics, used for 2-pass encoding */
2307 * number of bits used for the previously encoded frame
2308 * - encoding: Set by libavcodec.
2309 * - decoding: unused
2314 * pass1 encoding statistics output buffer
2315 * - encoding: Set by libavcodec.
2316 * - decoding: unused
2321 * pass2 encoding statistics input buffer
2322 * Concatenated stuff from stats_out of pass1 should be placed here.
2323 * - encoding: Allocated/set/freed by user.
2324 * - decoding: unused
2329 * Work around bugs in encoders which sometimes cannot be detected automatically.
2330 * - encoding: Set by user
2331 * - decoding: Set by user
2333 int workaround_bugs;
2334 #define FF_BUG_AUTODETECT 1 ///< autodetection
2335 #if FF_API_OLD_MSMPEG4
2336 #define FF_BUG_OLD_MSMPEG4 2
2338 #define FF_BUG_XVID_ILACE 4
2339 #define FF_BUG_UMP4 8
2340 #define FF_BUG_NO_PADDING 16
2341 #define FF_BUG_AMV 32
2343 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2345 #define FF_BUG_QPEL_CHROMA 64
2346 #define FF_BUG_STD_QPEL 128
2347 #define FF_BUG_QPEL_CHROMA2 256
2348 #define FF_BUG_DIRECT_BLOCKSIZE 512
2349 #define FF_BUG_EDGE 1024
2350 #define FF_BUG_HPEL_CHROMA 2048
2351 #define FF_BUG_DC_CLIP 4096
2352 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2353 #define FF_BUG_TRUNCATED 16384
2356 * strictly follow the standard (MPEG4, ...).
2357 * - encoding: Set by user.
2358 * - decoding: Set by user.
2359 * Setting this to STRICT or higher means the encoder and decoder will
2360 * generally do stupid things, whereas setting it to unofficial or lower
2361 * will mean the encoder might produce output that is not supported by all
2362 * spec-compliant decoders. Decoders don't differentiate between normal,
2363 * unofficial and experimental (that is, they always try to decode things
2364 * when they can) unless they are explicitly asked to behave stupidly
2365 * (=strictly conform to the specs)
2367 int strict_std_compliance;
2368 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2369 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2370 #define FF_COMPLIANCE_NORMAL 0
2371 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2372 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2375 * error concealment flags
2376 * - encoding: unused
2377 * - decoding: Set by user.
2379 int error_concealment;
2380 #define FF_EC_GUESS_MVS 1
2381 #define FF_EC_DEBLOCK 2
2385 * - encoding: Set by user.
2386 * - decoding: Set by user.
2389 #define FF_DEBUG_PICT_INFO 1
2390 #define FF_DEBUG_RC 2
2391 #define FF_DEBUG_BITSTREAM 4
2392 #define FF_DEBUG_MB_TYPE 8
2393 #define FF_DEBUG_QP 16
2396 * @deprecated this option does nothing
2398 #define FF_DEBUG_MV 32
2400 #define FF_DEBUG_DCT_COEFF 0x00000040
2401 #define FF_DEBUG_SKIP 0x00000080
2402 #define FF_DEBUG_STARTCODE 0x00000100
2403 #if FF_API_UNUSED_MEMBERS
2404 #define FF_DEBUG_PTS 0x00000200
2405 #endif /* FF_API_UNUSED_MEMBERS */
2406 #define FF_DEBUG_ER 0x00000400
2407 #define FF_DEBUG_MMCO 0x00000800
2408 #define FF_DEBUG_BUGS 0x00001000
2410 #define FF_DEBUG_VIS_QP 0x00002000
2411 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2413 #define FF_DEBUG_BUFFERS 0x00008000
2414 #define FF_DEBUG_THREADS 0x00010000
2418 * @deprecated this option does not have any effect
2420 attribute_deprecated
2422 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2423 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2424 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2428 * Error recognition; may misdetect some more or less valid parts as errors.
2429 * - encoding: unused
2430 * - decoding: Set by user.
2432 int err_recognition;
2435 * Verify checksums embedded in the bitstream (could be of either encoded or
2436 * decoded data, depending on the codec) and print an error message on mismatch.
2437 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2438 * decoder returning an error.
2440 #define AV_EF_CRCCHECK (1<<0)
2441 #define AV_EF_BITSTREAM (1<<1)
2442 #define AV_EF_BUFFER (1<<2)
2443 #define AV_EF_EXPLODE (1<<3)
2446 * opaque 64bit number (generally a PTS) that will be reordered and
2447 * output in AVFrame.reordered_opaque
2448 * - encoding: unused
2449 * - decoding: Set by user.
2451 int64_t reordered_opaque;
2454 * Hardware accelerator in use
2455 * - encoding: unused.
2456 * - decoding: Set by libavcodec
2458 struct AVHWAccel *hwaccel;
2461 * Hardware accelerator context.
2462 * For some hardware accelerators, a global context needs to be
2463 * provided by the user. In that case, this holds display-dependent
2464 * data Libav cannot instantiate itself. Please refer to the
2465 * Libav HW accelerator documentation to know how to fill this
2466 * is. e.g. for VA API, this is a struct vaapi_context.
2467 * - encoding: unused
2468 * - decoding: Set by user
2470 void *hwaccel_context;
2474 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2475 * - decoding: unused
2477 uint64_t error[AV_NUM_DATA_POINTERS];
2480 * DCT algorithm, see FF_DCT_* below
2481 * - encoding: Set by user.
2482 * - decoding: unused
2485 #define FF_DCT_AUTO 0
2486 #define FF_DCT_FASTINT 1
2487 #if FF_API_UNUSED_MEMBERS
2488 #define FF_DCT_INT 2
2489 #endif /* FF_API_UNUSED_MEMBERS */
2490 #define FF_DCT_MMX 3
2491 #define FF_DCT_ALTIVEC 5
2492 #define FF_DCT_FAAN 6
2495 * IDCT algorithm, see FF_IDCT_* below.
2496 * - encoding: Set by user.
2497 * - decoding: Set by user.
2500 #define FF_IDCT_AUTO 0
2501 #define FF_IDCT_INT 1
2502 #define FF_IDCT_SIMPLE 2
2503 #define FF_IDCT_SIMPLEMMX 3
2504 #define FF_IDCT_ARM 7
2505 #define FF_IDCT_ALTIVEC 8
2507 #define FF_IDCT_SH4 9
2509 #define FF_IDCT_SIMPLEARM 10
2510 #if FF_API_UNUSED_MEMBERS
2511 #define FF_IDCT_IPP 13
2512 #endif /* FF_API_UNUSED_MEMBERS */
2513 #define FF_IDCT_XVID 14
2514 #if FF_API_IDCT_XVIDMMX
2515 #define FF_IDCT_XVIDMMX 14
2516 #endif /* FF_API_IDCT_XVIDMMX */
2517 #define FF_IDCT_SIMPLEARMV5TE 16
2518 #define FF_IDCT_SIMPLEARMV6 17
2519 #if FF_API_ARCH_SPARC
2520 #define FF_IDCT_SIMPLEVIS 18
2522 #define FF_IDCT_FAAN 20
2523 #define FF_IDCT_SIMPLENEON 22
2524 #if FF_API_ARCH_ALPHA
2525 #define FF_IDCT_SIMPLEALPHA 23
2529 * bits per sample/pixel from the demuxer (needed for huffyuv).
2530 * - encoding: Set by libavcodec.
2531 * - decoding: Set by user.
2533 int bits_per_coded_sample;
2536 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2537 * - encoding: set by user.
2538 * - decoding: set by libavcodec.
2540 int bits_per_raw_sample;
2544 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2545 * - encoding: unused
2546 * - decoding: Set by user.
2548 * @deprecated use decoder private options instead
2550 attribute_deprecated int lowres;
2554 * the picture in the bitstream
2555 * - encoding: Set by libavcodec.
2556 * - decoding: unused
2558 AVFrame *coded_frame;
2562 * is used to decide how many independent tasks should be passed to execute()
2563 * - encoding: Set by user.
2564 * - decoding: Set by user.
2569 * Which multithreading methods to use.
2570 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2571 * so clients which cannot provide future frames should not use it.
2573 * - encoding: Set by user, otherwise the default is used.
2574 * - decoding: Set by user, otherwise the default is used.
2577 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2578 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2581 * Which multithreading methods are in use by the codec.
2582 * - encoding: Set by libavcodec.
2583 * - decoding: Set by libavcodec.
2585 int active_thread_type;
2588 * Set by the client if its custom get_buffer() callback can be called
2589 * synchronously from another thread, which allows faster multithreaded decoding.
2590 * draw_horiz_band() will be called from other threads regardless of this setting.
2591 * Ignored if the default get_buffer() is used.
2592 * - encoding: Set by user.
2593 * - decoding: Set by user.
2595 int thread_safe_callbacks;
2598 * The codec may call this to execute several independent things.
2599 * It will return only after finishing all tasks.
2600 * The user may replace this with some multithreaded implementation,
2601 * the default implementation will execute the parts serially.
2602 * @param count the number of things to execute
2603 * - encoding: Set by libavcodec, user can override.
2604 * - decoding: Set by libavcodec, user can override.
2606 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2609 * The codec may call this to execute several independent things.
2610 * It will return only after finishing all tasks.
2611 * The user may replace this with some multithreaded implementation,
2612 * the default implementation will execute the parts serially.
2613 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2614 * @param c context passed also to func
2615 * @param count the number of things to execute
2616 * @param arg2 argument passed unchanged to func
2617 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2618 * @param func function that will be called count times, with jobnr from 0 to count-1.
2619 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2620 * two instances of func executing at the same time will have the same threadnr.
2621 * @return always 0 currently, but code should handle a future improvement where when any call to func
2622 * returns < 0 no further calls to func may be done and < 0 is returned.
2623 * - encoding: Set by libavcodec, user can override.
2624 * - decoding: Set by libavcodec, user can override.
2626 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2628 #if FF_API_THREAD_OPAQUE
2630 * @deprecated this field should not be used from outside of lavc
2632 attribute_deprecated
2633 void *thread_opaque;
2637 * noise vs. sse weight for the nsse comparsion function
2638 * - encoding: Set by user.
2639 * - decoding: unused
2645 * - encoding: Set by user.
2646 * - decoding: Set by libavcodec.
2649 #define FF_PROFILE_UNKNOWN -99
2650 #define FF_PROFILE_RESERVED -100
2652 #define FF_PROFILE_AAC_MAIN 0
2653 #define FF_PROFILE_AAC_LOW 1
2654 #define FF_PROFILE_AAC_SSR 2
2655 #define FF_PROFILE_AAC_LTP 3
2656 #define FF_PROFILE_AAC_HE 4
2657 #define FF_PROFILE_AAC_HE_V2 28
2658 #define FF_PROFILE_AAC_LD 22
2659 #define FF_PROFILE_AAC_ELD 38
2660 #define FF_PROFILE_MPEG2_AAC_LOW 128
2661 #define FF_PROFILE_MPEG2_AAC_HE 131
2663 #define FF_PROFILE_DTS 20
2664 #define FF_PROFILE_DTS_ES 30
2665 #define FF_PROFILE_DTS_96_24 40
2666 #define FF_PROFILE_DTS_HD_HRA 50
2667 #define FF_PROFILE_DTS_HD_MA 60
2668 #define FF_PROFILE_DTS_EXPRESS 70
2670 #define FF_PROFILE_MPEG2_422 0
2671 #define FF_PROFILE_MPEG2_HIGH 1
2672 #define FF_PROFILE_MPEG2_SS 2
2673 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2674 #define FF_PROFILE_MPEG2_MAIN 4
2675 #define FF_PROFILE_MPEG2_SIMPLE 5
2677 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2678 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2680 #define FF_PROFILE_H264_BASELINE 66
2681 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2682 #define FF_PROFILE_H264_MAIN 77
2683 #define FF_PROFILE_H264_EXTENDED 88
2684 #define FF_PROFILE_H264_HIGH 100
2685 #define FF_PROFILE_H264_HIGH_10 110
2686 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2687 #define FF_PROFILE_H264_HIGH_422 122
2688 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2689 #define FF_PROFILE_H264_HIGH_444 144
2690 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2691 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2692 #define FF_PROFILE_H264_CAVLC_444 44
2694 #define FF_PROFILE_VC1_SIMPLE 0
2695 #define FF_PROFILE_VC1_MAIN 1
2696 #define FF_PROFILE_VC1_COMPLEX 2
2697 #define FF_PROFILE_VC1_ADVANCED 3
2699 #define FF_PROFILE_MPEG4_SIMPLE 0
2700 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2701 #define FF_PROFILE_MPEG4_CORE 2
2702 #define FF_PROFILE_MPEG4_MAIN 3
2703 #define FF_PROFILE_MPEG4_N_BIT 4
2704 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2705 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2706 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2707 #define FF_PROFILE_MPEG4_HYBRID 8
2708 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2709 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2710 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2711 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2712 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2713 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2714 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2716 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2717 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2718 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2719 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2720 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2722 #define FF_PROFILE_VP9_0 0
2723 #define FF_PROFILE_VP9_1 1
2724 #define FF_PROFILE_VP9_2 2
2725 #define FF_PROFILE_VP9_3 3
2727 #define FF_PROFILE_HEVC_MAIN 1
2728 #define FF_PROFILE_HEVC_MAIN_10 2
2729 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2733 * - encoding: Set by user.
2734 * - decoding: Set by libavcodec.
2737 #define FF_LEVEL_UNKNOWN -99
2741 * - encoding: unused
2742 * - decoding: Set by user.
2744 enum AVDiscard skip_loop_filter;
2748 * - encoding: unused
2749 * - decoding: Set by user.
2751 enum AVDiscard skip_idct;
2755 * - encoding: unused
2756 * - decoding: Set by user.
2758 enum AVDiscard skip_frame;
2761 * Header containing style information for text subtitles.
2762 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2763 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2764 * the Format line following. It shouldn't include any Dialogue line.
2765 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2766 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2768 uint8_t *subtitle_header;
2769 int subtitle_header_size;
2771 #if FF_API_ERROR_RATE
2773 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2776 attribute_deprecated
2780 #if FF_API_CODEC_PKT
2782 * @deprecated this field is not supposed to be accessed from outside lavc
2784 attribute_deprecated
2789 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2790 * Used for compliant TS muxing.
2791 * - encoding: Set by libavcodec.
2792 * - decoding: unused.
2797 * Encoding only. Allow encoders to output packets that do not contain any
2798 * encoded data, only side data.
2800 * Some encoders need to output such packets, e.g. to update some stream
2801 * parameters at the end of encoding.
2803 * All callers are strongly recommended to set this option to 1 and update
2804 * their code to deal with such packets, since this behaviour may become
2805 * always enabled in the future (then this option will be deprecated and
2806 * later removed). To avoid ABI issues when this happens, the callers should
2807 * use AVOptions to set this field.
2809 int side_data_only_packets;
2812 * Audio only. The number of "priming" samples (padding) inserted by the
2813 * encoder at the beginning of the audio. I.e. this number of leading
2814 * decoded samples must be discarded by the caller to get the original audio
2815 * without leading padding.
2817 * - decoding: unused
2818 * - encoding: Set by libavcodec. The timestamps on the output packets are
2819 * adjusted by the encoder so that they always refer to the
2820 * first sample of the data actually contained in the packet,
2821 * including any added padding. E.g. if the timebase is
2822 * 1/samplerate and the timestamp of the first input sample is
2823 * 0, the timestamp of the first output packet will be
2826 int initial_padding;
2829 * - decoding: For codecs that store a framerate value in the compressed
2830 * bitstream, the decoder may export it here. { 0, 1} when
2832 * - encoding: unused
2834 AVRational framerate;
2837 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
2838 * - encoding: unused.
2839 * - decoding: Set by libavcodec before calling get_format()
2841 enum AVPixelFormat sw_pix_fmt;
2847 typedef struct AVProfile {
2849 const char *name; ///< short name for the profile
2852 typedef struct AVCodecDefault AVCodecDefault;
2859 typedef struct AVCodec {
2861 * Name of the codec implementation.
2862 * The name is globally unique among encoders and among decoders (but an
2863 * encoder and a decoder can share the same name).
2864 * This is the primary way to find a codec from the user perspective.
2868 * Descriptive name for the codec, meant to be more human readable than name.
2869 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2871 const char *long_name;
2872 enum AVMediaType type;
2875 * Codec capabilities.
2879 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2880 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2881 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2882 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2883 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2885 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2887 const AVClass *priv_class; ///< AVClass for the private context
2888 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2890 /*****************************************************************
2891 * No fields below this line are part of the public API. They
2892 * may not be used outside of libavcodec and can be changed and
2894 * New public fields should be added right above.
2895 *****************************************************************
2898 struct AVCodec *next;
2900 * @name Frame-level threading support functions
2904 * If defined, called on thread contexts when they are created.
2905 * If the codec allocates writable tables in init(), re-allocate them here.
2906 * priv_data will be set to a copy of the original.
2908 int (*init_thread_copy)(AVCodecContext *);
2910 * Copy necessary context variables from a previous thread context to the current one.
2911 * If not defined, the next thread will start automatically; otherwise, the codec
2912 * must call ff_thread_finish_setup().
2914 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2916 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2920 * Private codec-specific defaults.
2922 const AVCodecDefault *defaults;
2925 * Initialize codec static data, called from avcodec_register().
2927 void (*init_static_data)(struct AVCodec *codec);
2929 int (*init)(AVCodecContext *);
2930 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2931 const struct AVSubtitle *sub);
2933 * Encode data to an AVPacket.
2935 * @param avctx codec context
2936 * @param avpkt output AVPacket (may contain a user-provided buffer)
2937 * @param[in] frame AVFrame containing the raw data to be encoded
2938 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2939 * non-empty packet was returned in avpkt.
2940 * @return 0 on success, negative error code on failure
2942 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2943 int *got_packet_ptr);
2944 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2945 int (*close)(AVCodecContext *);
2948 * Will be called when seeking
2950 void (*flush)(AVCodecContext *);
2952 * Internal codec capabilities.
2953 * See FF_CODEC_CAP_* in internal.h
2959 * @defgroup lavc_hwaccel AVHWAccel
2962 typedef struct AVHWAccel {
2964 * Name of the hardware accelerated codec.
2965 * The name is globally unique among encoders and among decoders (but an
2966 * encoder and a decoder can share the same name).
2971 * Type of codec implemented by the hardware accelerator.
2973 * See AVMEDIA_TYPE_xxx
2975 enum AVMediaType type;
2978 * Codec implemented by the hardware accelerator.
2980 * See AV_CODEC_ID_xxx
2985 * Supported pixel format.
2987 * Only hardware accelerated formats are supported here.
2989 enum AVPixelFormat pix_fmt;
2992 * Hardware accelerated codec capabilities.
2993 * see FF_HWACCEL_CODEC_CAP_*
2997 /*****************************************************************
2998 * No fields below this line are part of the public API. They
2999 * may not be used outside of libavcodec and can be changed and
3001 * New public fields should be added right above.
3002 *****************************************************************
3004 struct AVHWAccel *next;
3007 * Allocate a custom buffer
3009 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3012 * Called at the beginning of each frame or field picture.
3014 * Meaningful frame information (codec specific) is guaranteed to
3015 * be parsed at this point. This function is mandatory.
3017 * Note that buf can be NULL along with buf_size set to 0.
3018 * Otherwise, this means the whole frame is available at this point.
3020 * @param avctx the codec context
3021 * @param buf the frame data buffer base
3022 * @param buf_size the size of the frame in bytes
3023 * @return zero if successful, a negative value otherwise
3025 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3028 * Callback for each slice.
3030 * Meaningful slice information (codec specific) is guaranteed to
3031 * be parsed at this point. This function is mandatory.
3033 * @param avctx the codec context
3034 * @param buf the slice data buffer base
3035 * @param buf_size the size of the slice in bytes
3036 * @return zero if successful, a negative value otherwise
3038 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3041 * Called at the end of each frame or field picture.
3043 * The whole picture is parsed at this point and can now be sent
3044 * to the hardware accelerator. This function is mandatory.
3046 * @param avctx the codec context
3047 * @return zero if successful, a negative value otherwise
3049 int (*end_frame)(AVCodecContext *avctx);
3052 * Size of per-frame hardware accelerator private data.
3054 * Private data is allocated with av_mallocz() before
3055 * AVCodecContext.get_buffer() and deallocated after
3056 * AVCodecContext.release_buffer().
3058 int frame_priv_data_size;
3061 * Initialize the hwaccel private data.
3063 * This will be called from ff_get_format(), after hwaccel and
3064 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3067 int (*init)(AVCodecContext *avctx);
3070 * Uninitialize the hwaccel private data.
3072 * This will be called from get_format() or avcodec_close(), after hwaccel
3073 * and hwaccel_context are already uninitialized.
3075 int (*uninit)(AVCodecContext *avctx);
3078 * Size of the private data to allocate in
3079 * AVCodecInternal.hwaccel_priv_data.
3085 * Hardware acceleration should be used for decoding even if the codec level
3086 * used is unknown or higher than the maximum supported level reported by the
3089 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3092 * Hardware acceleration can output YUV pixel formats with a different chroma
3093 * sampling than 4:2:0 and/or other than 8 bits per component.
3095 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3102 * @defgroup lavc_picture AVPicture
3104 * Functions for working with AVPicture
3109 * four components are given, that's all.
3110 * the last component is alpha
3112 typedef struct AVPicture {
3113 uint8_t *data[AV_NUM_DATA_POINTERS];
3114 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3121 #define AVPALETTE_SIZE 1024
3122 #define AVPALETTE_COUNT 256
3124 enum AVSubtitleType {
3127 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3130 * Plain text, the text field must be set by the decoder and is
3131 * authoritative. ass and pict fields may contain approximations.
3136 * Formatted text, the ass field must be set by the decoder and is
3137 * authoritative. pict and text fields may contain approximations.
3142 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3144 typedef struct AVSubtitleRect {
3145 int x; ///< top left corner of pict, undefined when pict is not set
3146 int y; ///< top left corner of pict, undefined when pict is not set
3147 int w; ///< width of pict, undefined when pict is not set
3148 int h; ///< height of pict, undefined when pict is not set
3149 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3152 * data+linesize for the bitmap of this subtitle.
3153 * can be set for text/ass as well once they where rendered
3156 enum AVSubtitleType type;
3158 char *text; ///< 0 terminated plain UTF-8 text
3161 * 0 terminated ASS/SSA compatible event line.
3162 * The pressentation of this is unaffected by the other values in this
3169 typedef struct AVSubtitle {
3170 uint16_t format; /* 0 = graphics */
3171 uint32_t start_display_time; /* relative to packet pts, in ms */
3172 uint32_t end_display_time; /* relative to packet pts, in ms */
3174 AVSubtitleRect **rects;
3175 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3179 * If c is NULL, returns the first registered codec,
3180 * if c is non-NULL, returns the next registered codec after c,
3181 * or NULL if c is the last one.
3183 AVCodec *av_codec_next(const AVCodec *c);
3186 * Return the LIBAVCODEC_VERSION_INT constant.
3188 unsigned avcodec_version(void);
3191 * Return the libavcodec build-time configuration.
3193 const char *avcodec_configuration(void);
3196 * Return the libavcodec license.
3198 const char *avcodec_license(void);
3201 * Register the codec codec and initialize libavcodec.
3203 * @warning either this function or avcodec_register_all() must be called
3204 * before any other libavcodec functions.
3206 * @see avcodec_register_all()
3208 void avcodec_register(AVCodec *codec);
3211 * Register all the codecs, parsers and bitstream filters which were enabled at
3212 * configuration time. If you do not call this function you can select exactly
3213 * which formats you want to support, by using the individual registration
3216 * @see avcodec_register
3217 * @see av_register_codec_parser
3218 * @see av_register_bitstream_filter
3220 void avcodec_register_all(void);
3223 * Allocate an AVCodecContext and set its fields to default values. The
3224 * resulting struct should be freed with avcodec_free_context().
3226 * @param codec if non-NULL, allocate private data and initialize defaults
3227 * for the given codec. It is illegal to then call avcodec_open2()
3228 * with a different codec.
3229 * If NULL, then the codec-specific defaults won't be initialized,
3230 * which may result in suboptimal default settings (this is
3231 * important mainly for encoders, e.g. libx264).
3233 * @return An AVCodecContext filled with default values or NULL on failure.
3234 * @see avcodec_get_context_defaults
3236 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3239 * Free the codec context and everything associated with it and write NULL to
3240 * the provided pointer.
3242 void avcodec_free_context(AVCodecContext **avctx);
3245 * Set the fields of the given AVCodecContext to default values corresponding
3246 * to the given codec (defaults may be codec-dependent).
3248 * Do not call this function if a non-NULL codec has been passed
3249 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3250 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3251 * different codec on this AVCodecContext.
3253 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3256 * Get the AVClass for AVCodecContext. It can be used in combination with
3257 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3259 * @see av_opt_find().
3261 const AVClass *avcodec_get_class(void);
3264 * Copy the settings of the source AVCodecContext into the destination
3265 * AVCodecContext. The resulting destination codec context will be
3266 * unopened, i.e. you are required to call avcodec_open2() before you
3267 * can use this AVCodecContext to decode/encode video/audio data.
3269 * @param dest target codec context, should be initialized with
3270 * avcodec_alloc_context3(), but otherwise uninitialized
3271 * @param src source codec context
3272 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3274 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3276 #if FF_API_AVFRAME_LAVC
3278 * @deprecated use av_frame_alloc()
3280 attribute_deprecated
3281 AVFrame *avcodec_alloc_frame(void);
3284 * Set the fields of the given AVFrame to default values.
3286 * @param frame The AVFrame of which the fields should be set to default values.
3288 * @deprecated use av_frame_unref()
3290 attribute_deprecated
3291 void avcodec_get_frame_defaults(AVFrame *frame);
3294 * Free the frame and any dynamically allocated objects in it,
3295 * e.g. extended_data.
3297 * @param frame frame to be freed. The pointer will be set to NULL.
3299 * @warning this function does NOT free the data buffers themselves
3300 * (it does not know how, since they might have been allocated with
3301 * a custom get_buffer()).
3303 * @deprecated use av_frame_free()
3305 attribute_deprecated
3306 void avcodec_free_frame(AVFrame **frame);
3310 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3311 * function the context has to be allocated with avcodec_alloc_context3().
3313 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3314 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3315 * retrieving a codec.
3317 * @warning This function is not thread safe!
3319 * @note Always call this function before using decoding routines (such as
3320 * @ref avcodec_decode_video2()).
3323 * avcodec_register_all();
3324 * av_dict_set(&opts, "b", "2.5M", 0);
3325 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3329 * context = avcodec_alloc_context3(codec);
3331 * if (avcodec_open2(context, codec, opts) < 0)
3335 * @param avctx The context to initialize.
3336 * @param codec The codec to open this context for. If a non-NULL codec has been
3337 * previously passed to avcodec_alloc_context3() or
3338 * avcodec_get_context_defaults3() for this context, then this
3339 * parameter MUST be either NULL or equal to the previously passed
3341 * @param options A dictionary filled with AVCodecContext and codec-private options.
3342 * On return this object will be filled with options that were not found.
3344 * @return zero on success, a negative value on error
3345 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3346 * av_dict_set(), av_opt_find().
3348 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3351 * Close a given AVCodecContext and free all the data associated with it
3352 * (but not the AVCodecContext itself).
3354 * Calling this function on an AVCodecContext that hasn't been opened will free
3355 * the codec-specific data allocated in avcodec_alloc_context3() /
3356 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3359 int avcodec_close(AVCodecContext *avctx);
3362 * Free all allocated data in the given subtitle struct.
3364 * @param sub AVSubtitle to free.
3366 void avsubtitle_free(AVSubtitle *sub);
3373 * @addtogroup lavc_packet
3377 #if FF_API_DESTRUCT_PACKET
3379 * Default packet destructor.
3380 * @deprecated use the AVBuffer API instead
3382 attribute_deprecated
3383 void av_destruct_packet(AVPacket *pkt);
3387 * Initialize optional fields of a packet with default values.
3389 * Note, this does not touch the data and size members, which have to be
3390 * initialized separately.
3394 void av_init_packet(AVPacket *pkt);
3397 * Allocate the payload of a packet and initialize its fields with
3401 * @param size wanted payload size
3402 * @return 0 if OK, AVERROR_xxx otherwise
3404 int av_new_packet(AVPacket *pkt, int size);
3407 * Reduce packet size, correctly zeroing padding
3410 * @param size new size
3412 void av_shrink_packet(AVPacket *pkt, int size);
3415 * Increase packet size, correctly zeroing padding
3418 * @param grow_by number of bytes by which to increase the size of the packet
3420 int av_grow_packet(AVPacket *pkt, int grow_by);
3423 * Initialize a reference-counted packet from av_malloc()ed data.
3425 * @param pkt packet to be initialized. This function will set the data, size,
3426 * buf and destruct fields, all others are left untouched.
3427 * @param data Data allocated by av_malloc() to be used as packet data. If this
3428 * function returns successfully, the data is owned by the underlying AVBuffer.
3429 * The caller may not access the data through other means.
3430 * @param size size of data in bytes, without the padding. I.e. the full buffer
3431 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3433 * @return 0 on success, a negative AVERROR on error
3435 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3438 * @warning This is a hack - the packet memory allocation stuff is broken. The
3439 * packet is allocated if it was not really allocated.
3441 int av_dup_packet(AVPacket *pkt);
3446 * @param pkt packet to free
3448 void av_free_packet(AVPacket *pkt);
3451 * Allocate new information of a packet.
3454 * @param type side information type
3455 * @param size side information size
3456 * @return pointer to fresh allocated data or NULL otherwise
3458 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3462 * Shrink the already allocated side data buffer
3465 * @param type side information type
3466 * @param size new side information size
3467 * @return 0 on success, < 0 on failure
3469 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3473 * Get side information from packet.
3476 * @param type desired side information type
3477 * @param size pointer for side information size to store (optional)
3478 * @return pointer to data if present or NULL otherwise
3480 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3484 * Convenience function to free all the side data stored.
3485 * All the other fields stay untouched.
3489 void av_packet_free_side_data(AVPacket *pkt);
3492 * Setup a new reference to the data described by a given packet
3494 * If src is reference-counted, setup dst as a new reference to the
3495 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3496 * data from src into it.
3498 * All the other fields are copied from src.
3500 * @see av_packet_unref
3502 * @param dst Destination packet
3503 * @param src Source packet
3505 * @return 0 on success, a negative AVERROR on error.
3507 int av_packet_ref(AVPacket *dst, AVPacket *src);
3512 * Unreference the buffer referenced by the packet and reset the
3513 * remaining packet fields to their default values.
3515 * @param pkt The packet to be unreferenced.
3517 void av_packet_unref(AVPacket *pkt);
3520 * Move every field in src to dst and reset src.
3522 * @see av_packet_unref
3524 * @param src Source packet, will be reset
3525 * @param dst Destination packet
3527 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3530 * Copy only "properties" fields from src to dst.
3532 * Properties for the purpose of this function are all the fields
3533 * beside those related to the packet data (buf, data, size)
3535 * @param dst Destination packet
3536 * @param src Source packet
3538 * @return 0 on success AVERROR on failure.
3541 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3544 * Convert valid timing fields (timestamps / durations) in a packet from one
3545 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
3548 * @param pkt packet on which the conversion will be performed
3549 * @param tb_src source timebase, in which the timing fields in pkt are
3551 * @param tb_dst destination timebase, to which the timing fields will be
3554 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
3561 * @addtogroup lavc_decoding
3566 * Find a registered decoder with a matching codec ID.
3568 * @param id AVCodecID of the requested decoder
3569 * @return A decoder if one was found, NULL otherwise.
3571 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3574 * Find a registered decoder with the specified name.
3576 * @param name name of the requested decoder
3577 * @return A decoder if one was found, NULL otherwise.
3579 AVCodec *avcodec_find_decoder_by_name(const char *name);
3581 #if FF_API_GET_BUFFER
3582 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3583 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3584 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3588 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3589 * it can be called by custom get_buffer2() implementations for decoders without
3590 * CODEC_CAP_DR1 set.
3592 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3596 * Return the amount of padding in pixels which the get_buffer callback must
3597 * provide around the edge of the image for codecs which do not have the
3598 * CODEC_FLAG_EMU_EDGE flag.
3600 * @return Required padding in pixels.
3602 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3605 attribute_deprecated
3606 unsigned avcodec_get_edge_width(void);
3610 * Modify width and height values so that they will result in a memory
3611 * buffer that is acceptable for the codec if you do not use any horizontal
3614 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3616 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3619 * Modify width and height values so that they will result in a memory
3620 * buffer that is acceptable for the codec if you also ensure that all
3621 * line sizes are a multiple of the respective linesize_align[i].
3623 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3625 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3626 int linesize_align[AV_NUM_DATA_POINTERS]);
3629 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3631 * Some decoders may support multiple frames in a single AVPacket. Such
3632 * decoders would then just decode the first frame and the return value would be
3633 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3634 * called again with an AVPacket containing the remaining data in order to
3635 * decode the second frame, etc... Even if no frames are returned, the packet
3636 * needs to be fed to the decoder with remaining data until it is completely
3637 * consumed or an error occurs.
3639 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3640 * and output. This means that for some packets they will not immediately
3641 * produce decoded output and need to be flushed at the end of decoding to get
3642 * all the decoded data. Flushing is done by calling this function with packets
3643 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3644 * returning samples. It is safe to flush even those decoders that are not
3645 * marked with CODEC_CAP_DELAY, then no samples will be returned.
3647 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3648 * larger than the actual read bytes because some optimized bitstream
3649 * readers read 32 or 64 bits at once and could read over the end.
3651 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3652 * before packets may be fed to the decoder.
3654 * @param avctx the codec context
3655 * @param[out] frame The AVFrame in which to store decoded audio samples.
3656 * The decoder will allocate a buffer for the decoded frame by
3657 * calling the AVCodecContext.get_buffer2() callback.
3658 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3659 * reference counted and the returned reference belongs to the
3660 * caller. The caller must release the frame using av_frame_unref()
3661 * when the frame is no longer needed. The caller may safely write
3662 * to the frame if av_frame_is_writable() returns 1.
3663 * When AVCodecContext.refcounted_frames is set to 0, the returned
3664 * reference belongs to the decoder and is valid only until the
3665 * next call to this function or until closing or flushing the
3666 * decoder. The caller may not write to it.
3667 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3668 * non-zero. Note that this field being set to zero
3669 * does not mean that an error has occurred. For
3670 * decoders with CODEC_CAP_DELAY set, no given decode
3671 * call is guaranteed to produce a frame.
3672 * @param[in] avpkt The input AVPacket containing the input buffer.
3673 * At least avpkt->data and avpkt->size should be set. Some
3674 * decoders might also require additional fields to be set.
3675 * @return A negative error code is returned if an error occurred during
3676 * decoding, otherwise the number of bytes consumed from the input
3677 * AVPacket is returned.
3679 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3680 int *got_frame_ptr, AVPacket *avpkt);
3683 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3684 * Some decoders may support multiple frames in a single AVPacket, such
3685 * decoders would then just decode the first frame.
3687 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3688 * the actual read bytes because some optimized bitstream readers read 32 or 64
3689 * bits at once and could read over the end.
3691 * @warning The end of the input buffer buf should be set to 0 to ensure that
3692 * no overreading happens for damaged MPEG streams.
3694 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3695 * between input and output, these need to be fed with avpkt->data=NULL,
3696 * avpkt->size=0 at the end to return the remaining frames.
3698 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3699 * before packets may be fed to the decoder.
3701 * @param avctx the codec context
3702 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3703 * Use av_frame_alloc() to get an AVFrame. The codec will
3704 * allocate memory for the actual bitmap by calling the
3705 * AVCodecContext.get_buffer2() callback.
3706 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3707 * reference counted and the returned reference belongs to the
3708 * caller. The caller must release the frame using av_frame_unref()
3709 * when the frame is no longer needed. The caller may safely write
3710 * to the frame if av_frame_is_writable() returns 1.
3711 * When AVCodecContext.refcounted_frames is set to 0, the returned
3712 * reference belongs to the decoder and is valid only until the
3713 * next call to this function or until closing or flushing the
3714 * decoder. The caller may not write to it.
3716 * @param[in] avpkt The input AVpacket containing the input buffer.
3717 * You can create such packet with av_init_packet() and by then setting
3718 * data and size, some decoders might in addition need other fields like
3719 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3721 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3722 * @return On error a negative value is returned, otherwise the number of bytes
3723 * used or zero if no frame could be decompressed.
3725 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3726 int *got_picture_ptr,
3730 * Decode a subtitle message.
3731 * Return a negative value on error, otherwise return the number of bytes used.
3732 * If no subtitle could be decompressed, got_sub_ptr is zero.
3733 * Otherwise, the subtitle is stored in *sub.
3734 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3735 * simplicity, because the performance difference is expect to be negligible
3736 * and reusing a get_buffer written for video codecs would probably perform badly
3737 * due to a potentially very different allocation pattern.
3739 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3740 * before packets may be fed to the decoder.
3742 * @param avctx the codec context
3743 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3744 freed with avsubtitle_free if *got_sub_ptr is set.
3745 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3746 * @param[in] avpkt The input AVPacket containing the input buffer.
3748 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3753 * @defgroup lavc_parsing Frame parsing
3757 enum AVPictureStructure {
3758 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3759 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3760 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3761 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3764 typedef struct AVCodecParserContext {
3766 struct AVCodecParser *parser;
3767 int64_t frame_offset; /* offset of the current frame */
3768 int64_t cur_offset; /* current offset
3769 (incremented by each av_parser_parse()) */
3770 int64_t next_frame_offset; /* offset of the next frame */
3772 int pict_type; /* XXX: Put it back in AVCodecContext. */
3774 * This field is used for proper frame duration computation in lavf.
3775 * It signals, how much longer the frame duration of the current frame
3776 * is compared to normal frame duration.
3778 * frame_duration = (1 + repeat_pict) * time_base
3780 * It is used by codecs like H.264 to display telecined material.
3782 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3783 int64_t pts; /* pts of the current frame */
3784 int64_t dts; /* dts of the current frame */
3789 int fetch_timestamp;
3791 #define AV_PARSER_PTS_NB 4
3792 int cur_frame_start_index;
3793 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3794 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3795 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3798 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3799 #define PARSER_FLAG_ONCE 0x0002
3800 /// Set if the parser has a valid file offset
3801 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3803 int64_t offset; ///< byte offset from starting packet start
3804 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3807 * Set by parser to 1 for key frames and 0 for non-key frames.
3808 * It is initialized to -1, so if the parser doesn't set this flag,
3809 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3815 * Time difference in stream time base units from the pts of this
3816 * packet to the point at which the output from the decoder has converged
3817 * independent from the availability of previous frames. That is, the
3818 * frames are virtually identical no matter if decoding started from
3819 * the very first frame or from this keyframe.
3820 * Is AV_NOPTS_VALUE if unknown.
3821 * This field is not the display duration of the current frame.
3822 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3825 * The purpose of this field is to allow seeking in streams that have no
3826 * keyframes in the conventional sense. It corresponds to the
3827 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3828 * essential for some types of subtitle streams to ensure that all
3829 * subtitles are correctly displayed after seeking.
3831 int64_t convergence_duration;
3833 // Timestamp generation support:
3835 * Synchronization point for start of timestamp generation.
3837 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3840 * For example, this corresponds to presence of H.264 buffering period
3846 * Offset of the current timestamp against last timestamp sync point in
3847 * units of AVCodecContext.time_base.
3849 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3850 * contain a valid timestamp offset.
3852 * Note that the timestamp of sync point has usually a nonzero
3853 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3854 * the next frame after timestamp sync point will be usually 1.
3856 * For example, this corresponds to H.264 cpb_removal_delay.
3858 int dts_ref_dts_delta;
3861 * Presentation delay of current frame in units of AVCodecContext.time_base.
3863 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3864 * contain valid non-negative timestamp delta (presentation time of a frame
3865 * must not lie in the past).
3867 * This delay represents the difference between decoding and presentation
3868 * time of the frame.
3870 * For example, this corresponds to H.264 dpb_output_delay.
3875 * Position of the packet in file.
3877 * Analogous to cur_frame_pts/dts
3879 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3882 * Byte position of currently parsed frame in stream.
3887 * Previous frame byte position.
3892 * Duration of the current frame.
3893 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3894 * For all other types, this is in units of AVCodecContext.time_base.
3898 enum AVFieldOrder field_order;
3901 * Indicate whether a picture is coded as a frame, top field or bottom field.
3903 * For example, H.264 field_pic_flag equal to 0 corresponds to
3904 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3905 * equal to 1 and bottom_field_flag equal to 0 corresponds to
3906 * AV_PICTURE_STRUCTURE_TOP_FIELD.
3908 enum AVPictureStructure picture_structure;
3911 * Picture number incremented in presentation or output order.
3912 * This field may be reinitialized at the first picture of a new sequence.
3914 * For example, this corresponds to H.264 PicOrderCnt.
3916 int output_picture_number;
3919 * Dimensions of the decoded video intended for presentation.
3925 * Dimensions of the coded video.
3931 * The format of the coded data, corresponds to enum AVPixelFormat for video
3932 * and for enum AVSampleFormat for audio.
3934 * Note that a decoder can have considerable freedom in how exactly it
3935 * decodes the data, so the format reported here might be different from the
3936 * one returned by a decoder.
3939 } AVCodecParserContext;
3941 typedef struct AVCodecParser {
3942 int codec_ids[5]; /* several codec IDs are permitted */
3944 int (*parser_init)(AVCodecParserContext *s);
3945 /* This callback never returns an error, a negative value means that
3946 * the frame start was in a previous packet. */
3947 int (*parser_parse)(AVCodecParserContext *s,
3948 AVCodecContext *avctx,
3949 const uint8_t **poutbuf, int *poutbuf_size,
3950 const uint8_t *buf, int buf_size);
3951 void (*parser_close)(AVCodecParserContext *s);
3952 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3953 struct AVCodecParser *next;
3956 AVCodecParser *av_parser_next(const AVCodecParser *c);
3958 void av_register_codec_parser(AVCodecParser *parser);
3959 AVCodecParserContext *av_parser_init(int codec_id);
3964 * @param s parser context.
3965 * @param avctx codec context.
3966 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3967 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3968 * @param buf input buffer.
3969 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3970 * @param pts input presentation timestamp.
3971 * @param dts input decoding timestamp.
3972 * @param pos input byte position in stream.
3973 * @return the number of bytes of the input bitstream used.
3978 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3985 * decode_frame(data, size);
3989 int av_parser_parse2(AVCodecParserContext *s,
3990 AVCodecContext *avctx,
3991 uint8_t **poutbuf, int *poutbuf_size,
3992 const uint8_t *buf, int buf_size,
3993 int64_t pts, int64_t dts,
3997 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3998 * @deprecated use AVBitstreamFilter
4000 int av_parser_change(AVCodecParserContext *s,
4001 AVCodecContext *avctx,
4002 uint8_t **poutbuf, int *poutbuf_size,
4003 const uint8_t *buf, int buf_size, int keyframe);
4004 void av_parser_close(AVCodecParserContext *s);
4012 * @addtogroup lavc_encoding
4017 * Find a registered encoder with a matching codec ID.
4019 * @param id AVCodecID of the requested encoder
4020 * @return An encoder if one was found, NULL otherwise.
4022 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4025 * Find a registered encoder with the specified name.
4027 * @param name name of the requested encoder
4028 * @return An encoder if one was found, NULL otherwise.
4030 AVCodec *avcodec_find_encoder_by_name(const char *name);
4033 * Encode a frame of audio.
4035 * Takes input samples from frame and writes the next output packet, if
4036 * available, to avpkt. The output packet does not necessarily contain data for
4037 * the most recent frame, as encoders can delay, split, and combine input frames
4038 * internally as needed.
4040 * @param avctx codec context
4041 * @param avpkt output AVPacket.
4042 * The user can supply an output buffer by setting
4043 * avpkt->data and avpkt->size prior to calling the
4044 * function, but if the size of the user-provided data is not
4045 * large enough, encoding will fail. All other AVPacket fields
4046 * will be reset by the encoder using av_init_packet(). If
4047 * avpkt->data is NULL, the encoder will allocate it.
4048 * The encoder will set avpkt->size to the size of the
4051 * If this function fails or produces no output, avpkt will be
4052 * freed using av_free_packet() (i.e. avpkt->destruct will be
4053 * called to free the user supplied buffer).
4054 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4055 * May be NULL when flushing an encoder that has the
4056 * CODEC_CAP_DELAY capability set.
4057 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4058 * can have any number of samples.
4059 * If it is not set, frame->nb_samples must be equal to
4060 * avctx->frame_size for all frames except the last.
4061 * The final frame may be smaller than avctx->frame_size.
4062 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4063 * output packet is non-empty, and to 0 if it is
4064 * empty. If the function returns an error, the
4065 * packet can be assumed to be invalid, and the
4066 * value of got_packet_ptr is undefined and should
4068 * @return 0 on success, negative error code on failure
4070 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4071 const AVFrame *frame, int *got_packet_ptr);
4074 * Encode a frame of video.
4076 * Takes input raw video data from frame and writes the next output packet, if
4077 * available, to avpkt. The output packet does not necessarily contain data for
4078 * the most recent frame, as encoders can delay and reorder input frames
4079 * internally as needed.
4081 * @param avctx codec context
4082 * @param avpkt output AVPacket.
4083 * The user can supply an output buffer by setting
4084 * avpkt->data and avpkt->size prior to calling the
4085 * function, but if the size of the user-provided data is not
4086 * large enough, encoding will fail. All other AVPacket fields
4087 * will be reset by the encoder using av_init_packet(). If
4088 * avpkt->data is NULL, the encoder will allocate it.
4089 * The encoder will set avpkt->size to the size of the
4090 * output packet. The returned data (if any) belongs to the
4091 * caller, he is responsible for freeing it.
4093 * If this function fails or produces no output, avpkt will be
4094 * freed using av_free_packet() (i.e. avpkt->destruct will be
4095 * called to free the user supplied buffer).
4096 * @param[in] frame AVFrame containing the raw video data to be encoded.
4097 * May be NULL when flushing an encoder that has the
4098 * CODEC_CAP_DELAY capability set.
4099 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4100 * output packet is non-empty, and to 0 if it is
4101 * empty. If the function returns an error, the
4102 * packet can be assumed to be invalid, and the
4103 * value of got_packet_ptr is undefined and should
4105 * @return 0 on success, negative error code on failure
4107 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4108 const AVFrame *frame, int *got_packet_ptr);
4110 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4111 const AVSubtitle *sub);
4119 * @addtogroup lavc_picture
4124 * Allocate memory for a picture. Call avpicture_free() to free it.
4126 * @see avpicture_fill()
4128 * @param picture the picture to be filled in
4129 * @param pix_fmt the format of the picture
4130 * @param width the width of the picture
4131 * @param height the height of the picture
4132 * @return zero if successful, a negative value if not
4134 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4137 * Free a picture previously allocated by avpicture_alloc().
4138 * The data buffer used by the AVPicture is freed, but the AVPicture structure
4141 * @param picture the AVPicture to be freed
4143 void avpicture_free(AVPicture *picture);
4146 * Fill in the AVPicture fields, always assume a linesize alignment of 1.
4148 * @see av_image_fill_arrays().
4150 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4151 enum AVPixelFormat pix_fmt, int width, int height);
4154 * Copy pixel data from an AVPicture into a buffer, always assume a
4155 * linesize alignment of 1.
4157 * @see av_image_copy_to_buffer().
4159 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4160 int width, int height,
4161 unsigned char *dest, int dest_size);
4164 * Calculate the size in bytes that a picture of the given width and height
4165 * would occupy if stored in the given picture format.
4166 * Always assume a linesize alignment of 1.
4168 * @see av_image_get_buffer_size().
4170 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4172 #if FF_API_DEINTERLACE
4174 * deinterlace - if not supported return -1
4176 * @deprecated - use yadif (in libavfilter) instead
4178 attribute_deprecated
4179 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4180 enum AVPixelFormat pix_fmt, int width, int height);
4183 * Copy image src to dst. Wraps av_picture_data_copy() above.
4185 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4186 enum AVPixelFormat pix_fmt, int width, int height);
4189 * Crop image top and left side.
4191 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4192 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4197 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4198 int padtop, int padbottom, int padleft, int padright, int *color);
4205 * @defgroup lavc_misc Utility functions
4208 * Miscellaneous utility functions related to both encoding and decoding
4214 * @defgroup lavc_misc_pixfmt Pixel formats
4216 * Functions for working with pixel formats.
4221 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
4224 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4227 * Return a value representing the fourCC code associated to the
4228 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4231 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4233 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4234 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4235 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4236 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4237 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4238 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4241 * Compute what kind of losses will occur when converting from one specific
4242 * pixel format to another.
4243 * When converting from one pixel format to another, information loss may occur.
4244 * For example, when converting from RGB24 to GRAY, the color information will
4245 * be lost. Similarly, other losses occur when converting from some formats to
4246 * other formats. These losses can involve loss of chroma, but also loss of
4247 * resolution, loss of color depth, loss due to the color space conversion, loss
4248 * of the alpha bits or loss due to color quantization.
4249 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4250 * which will occur when converting from one pixel format to another.
4252 * @param[in] dst_pix_fmt destination pixel format
4253 * @param[in] src_pix_fmt source pixel format
4254 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4255 * @return Combination of flags informing you what kind of losses will occur.
4257 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4261 * Find the best pixel format to convert to given a certain source pixel
4262 * format. When converting from one pixel format to another, information loss
4263 * may occur. For example, when converting from RGB24 to GRAY, the color
4264 * information will be lost. Similarly, other losses occur when converting from
4265 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4266 * the given pixel formats should be used to suffer the least amount of loss.
4267 * The pixel formats from which it chooses one, are determined by the
4268 * pix_fmt_list parameter.
4271 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4272 * @param[in] src_pix_fmt source pixel format
4273 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4274 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4275 * @return The best pixel format to convert to or -1 if none was found.
4277 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4278 enum AVPixelFormat src_pix_fmt,
4279 int has_alpha, int *loss_ptr);
4281 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4287 #if FF_API_SET_DIMENSIONS
4289 * @deprecated this function is not supposed to be used from outside of lavc
4291 attribute_deprecated
4292 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4296 * Put a string representing the codec tag codec_tag in buf.
4298 * @param buf buffer to place codec tag in
4299 * @param buf_size size in bytes of buf
4300 * @param codec_tag codec tag to assign
4301 * @return the length of the string that would have been generated if
4302 * enough space had been available, excluding the trailing null
4304 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4306 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4309 * Return a name for the specified profile, if available.
4311 * @param codec the codec that is searched for the given profile
4312 * @param profile the profile value for which a name is requested
4313 * @return A name for the profile if found, NULL otherwise.
4315 const char *av_get_profile_name(const AVCodec *codec, int profile);
4317 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4318 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4319 //FIXME func typedef
4322 * Fill audio frame data and linesize.
4323 * AVFrame extended_data channel pointers are allocated if necessary for
4326 * @param frame the AVFrame
4327 * frame->nb_samples must be set prior to calling the
4328 * function. This function fills in frame->data,
4329 * frame->extended_data, frame->linesize[0].
4330 * @param nb_channels channel count
4331 * @param sample_fmt sample format
4332 * @param buf buffer to use for frame data
4333 * @param buf_size size of buffer
4334 * @param align plane size sample alignment (0 = default)
4335 * @return 0 on success, negative error code on failure
4337 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4338 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4339 int buf_size, int align);
4342 * Reset the internal decoder state / flush internal buffers. Should be called
4343 * e.g. when seeking or when switching to a different stream.
4345 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4346 * this invalidates the frames previously returned from the decoder. When
4347 * refcounted frames are used, the decoder just releases any references it might
4348 * keep internally, but the caller's reference remains valid.
4350 void avcodec_flush_buffers(AVCodecContext *avctx);
4353 * Return codec bits per sample.
4355 * @param[in] codec_id the codec
4356 * @return Number of bits per sample or zero if unknown for the given codec.
4358 int av_get_bits_per_sample(enum AVCodecID codec_id);
4361 * Return codec bits per sample.
4362 * Only return non-zero if the bits per sample is exactly correct, not an
4365 * @param[in] codec_id the codec
4366 * @return Number of bits per sample or zero if unknown for the given codec.
4368 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4371 * Return audio frame duration.
4373 * @param avctx codec context
4374 * @param frame_bytes size of the frame, or 0 if unknown
4375 * @return frame duration, in samples, if known. 0 if not able to
4378 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4381 typedef struct AVBitStreamFilterContext {
4383 struct AVBitStreamFilter *filter;
4384 AVCodecParserContext *parser;
4385 struct AVBitStreamFilterContext *next;
4386 } AVBitStreamFilterContext;
4389 typedef struct AVBitStreamFilter {
4392 int (*filter)(AVBitStreamFilterContext *bsfc,
4393 AVCodecContext *avctx, const char *args,
4394 uint8_t **poutbuf, int *poutbuf_size,
4395 const uint8_t *buf, int buf_size, int keyframe);
4396 void (*close)(AVBitStreamFilterContext *bsfc);
4397 struct AVBitStreamFilter *next;
4398 } AVBitStreamFilter;
4400 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4401 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4402 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4403 AVCodecContext *avctx, const char *args,
4404 uint8_t **poutbuf, int *poutbuf_size,
4405 const uint8_t *buf, int buf_size, int keyframe);
4406 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4408 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
4413 * Allocate a buffer with padding, reusing the given one if large enough.
4415 * Same behaviour av_fast_malloc but the buffer has additional
4416 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4419 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4422 * Encode extradata length to a buffer. Used by xiph codecs.
4424 * @param s buffer to write to; must be at least (v/255+1) bytes long
4425 * @param v size of extradata in bytes
4426 * @return number of bytes written to the buffer.
4428 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4430 #if FF_API_MISSING_SAMPLE
4432 * Log a generic warning message about a missing feature. This function is
4433 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4434 * only, and would normally not be used by applications.
4435 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4436 * a pointer to an AVClass struct
4437 * @param[in] feature string containing the name of the missing feature
4438 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4439 * If want_sample is non-zero, additional verbage will be added to the log
4440 * message which tells the user how to report samples to the development
4442 * @deprecated Use avpriv_report_missing_feature() instead.
4444 attribute_deprecated
4445 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4448 * Log a generic warning message asking for a sample. This function is
4449 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4450 * only, and would normally not be used by applications.
4451 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4452 * a pointer to an AVClass struct
4453 * @param[in] msg string containing an optional message, or NULL if no message
4454 * @deprecated Use avpriv_request_sample() instead.
4456 attribute_deprecated
4457 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4458 #endif /* FF_API_MISSING_SAMPLE */
4461 * Register the hardware accelerator hwaccel.
4463 void av_register_hwaccel(AVHWAccel *hwaccel);
4466 * If hwaccel is NULL, returns the first registered hardware accelerator,
4467 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4468 * after hwaccel, or NULL if hwaccel is the last one.
4470 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
4474 * Lock operation used by lockmgr
4477 AV_LOCK_CREATE, ///< Create a mutex
4478 AV_LOCK_OBTAIN, ///< Lock the mutex
4479 AV_LOCK_RELEASE, ///< Unlock the mutex
4480 AV_LOCK_DESTROY, ///< Free mutex resources
4484 * Register a user provided lock manager supporting the operations
4485 * specified by AVLockOp. The "mutex" argument to the function points
4486 * to a (void *) where the lockmgr should store/get a pointer to a user
4487 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
4488 * value left by the last call for all other ops. If the lock manager is
4489 * unable to perform the op then it should leave the mutex in the same
4490 * state as when it was called and return a non-zero value. However,
4491 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
4492 * have been successfully destroyed. If av_lockmgr_register succeeds
4493 * it will return a non-negative value, if it fails it will return a
4494 * negative value and destroy all mutex and unregister all callbacks.
4495 * av_lockmgr_register is not thread-safe, it must be called from a
4496 * single thread before any calls which make use of locking are used.
4498 * @param cb User defined callback. av_lockmgr_register invokes calls
4499 * to this callback and the previously registered callback.
4500 * The callback will be used to create more than one mutex
4501 * each of which must be backed by its own underlying locking
4502 * mechanism (i.e. do not use a single static object to
4503 * implement your lock manager). If cb is set to NULL the
4504 * lockmgr will be unregistered.
4506 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4509 * Get the type of the given codec.
4511 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4514 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4515 * with no corresponding avcodec_close()), 0 otherwise.
4517 int avcodec_is_open(AVCodecContext *s);
4520 * @return a non-zero number if codec is an encoder, zero otherwise
4522 int av_codec_is_encoder(const AVCodec *codec);
4525 * @return a non-zero number if codec is a decoder, zero otherwise
4527 int av_codec_is_decoder(const AVCodec *codec);
4530 * @return descriptor for given codec ID or NULL if no descriptor exists.
4532 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4535 * Iterate over all codec descriptors known to libavcodec.
4537 * @param prev previous descriptor. NULL to get the first descriptor.
4539 * @return next descriptor or NULL after the last descriptor
4541 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4544 * @return codec descriptor with the given name or NULL if no such descriptor
4547 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4553 #endif /* AVCODEC_AVCODEC_H */