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"
42 #include "libavcodec/version.h"
44 * @defgroup libavc Encoding/Decoding Library
47 * @defgroup lavc_decoding Decoding
51 * @defgroup lavc_encoding Encoding
55 * @defgroup lavc_codec Codecs
57 * @defgroup lavc_codec_native Native Codecs
60 * @defgroup lavc_codec_wrappers External library wrappers
63 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
67 * @defgroup lavc_internal Internal
75 * @defgroup lavc_core Core functions/structures.
78 * Basic definitions, functions for querying libavcodec capabilities,
79 * allocating core structures, etc.
85 * Identify the syntax and semantics of the bitstream.
86 * The principle is roughly:
87 * Two decoders with the same ID can decode the same streams.
88 * Two encoders with the same ID can encode compatible streams.
89 * There may be slight deviations from the principle due to implementation
92 * If you add a codec ID to this list, add it so that
93 * 1. no value of a existing codec ID changes (that would break ABI),
94 * 2. it is as close as possible to similar codecs.
96 * After adding new codec IDs, do not forget to add an entry to the codec
97 * descriptor list and bump libavcodec minor version.
103 AV_CODEC_ID_MPEG1VIDEO,
104 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
105 AV_CODEC_ID_MPEG2VIDEO_XVMC,
116 AV_CODEC_ID_RAWVIDEO,
117 AV_CODEC_ID_MSMPEG4V1,
118 AV_CODEC_ID_MSMPEG4V2,
119 AV_CODEC_ID_MSMPEG4V3,
142 AV_CODEC_ID_INTERPLAY_VIDEO,
149 AV_CODEC_ID_MSVIDEO1,
154 AV_CODEC_ID_TRUEMOTION1,
155 AV_CODEC_ID_VMDVIDEO,
180 AV_CODEC_ID_TRUEMOTION2,
186 AV_CODEC_ID_SMACKVIDEO,
191 AV_CODEC_ID_JPEG2000,
197 AV_CODEC_ID_DSICINVIDEO,
198 AV_CODEC_ID_TIERTEXSEQVIDEO,
206 AV_CODEC_ID_BETHSOFTVID,
218 AV_CODEC_ID_ESCAPE124,
222 AV_CODEC_ID_MOTIONPIXELS,
234 AV_CODEC_ID_FLASHSV2,
235 AV_CODEC_ID_CDGRAPHICS,
238 AV_CODEC_ID_BINKVIDEO,
239 AV_CODEC_ID_IFF_ILBM,
240 AV_CODEC_ID_IFF_BYTERUN1,
246 AV_CODEC_ID_A64_MULTI,
247 AV_CODEC_ID_A64_MULTI5,
250 AV_CODEC_ID_LAGARITH,
254 AV_CODEC_ID_WMV3IMAGE,
255 AV_CODEC_ID_VC1IMAGE,
257 AV_CODEC_ID_BMV_VIDEO,
264 AV_CODEC_ID_ZEROCODEC,
273 AV_CODEC_ID_ESCAPE130,
276 /* various PCM "codecs" */
277 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
278 AV_CODEC_ID_PCM_S16LE = 0x10000,
279 AV_CODEC_ID_PCM_S16BE,
280 AV_CODEC_ID_PCM_U16LE,
281 AV_CODEC_ID_PCM_U16BE,
284 AV_CODEC_ID_PCM_MULAW,
285 AV_CODEC_ID_PCM_ALAW,
286 AV_CODEC_ID_PCM_S32LE,
287 AV_CODEC_ID_PCM_S32BE,
288 AV_CODEC_ID_PCM_U32LE,
289 AV_CODEC_ID_PCM_U32BE,
290 AV_CODEC_ID_PCM_S24LE,
291 AV_CODEC_ID_PCM_S24BE,
292 AV_CODEC_ID_PCM_U24LE,
293 AV_CODEC_ID_PCM_U24BE,
294 AV_CODEC_ID_PCM_S24DAUD,
295 AV_CODEC_ID_PCM_ZORK,
296 AV_CODEC_ID_PCM_S16LE_PLANAR,
298 AV_CODEC_ID_PCM_F32BE,
299 AV_CODEC_ID_PCM_F32LE,
300 AV_CODEC_ID_PCM_F64BE,
301 AV_CODEC_ID_PCM_F64LE,
302 AV_CODEC_ID_PCM_BLURAY,
305 AV_CODEC_ID_PCM_S8_PLANAR,
307 /* various ADPCM codecs */
308 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
309 AV_CODEC_ID_ADPCM_IMA_WAV,
310 AV_CODEC_ID_ADPCM_IMA_DK3,
311 AV_CODEC_ID_ADPCM_IMA_DK4,
312 AV_CODEC_ID_ADPCM_IMA_WS,
313 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
314 AV_CODEC_ID_ADPCM_MS,
315 AV_CODEC_ID_ADPCM_4XM,
316 AV_CODEC_ID_ADPCM_XA,
317 AV_CODEC_ID_ADPCM_ADX,
318 AV_CODEC_ID_ADPCM_EA,
319 AV_CODEC_ID_ADPCM_G726,
320 AV_CODEC_ID_ADPCM_CT,
321 AV_CODEC_ID_ADPCM_SWF,
322 AV_CODEC_ID_ADPCM_YAMAHA,
323 AV_CODEC_ID_ADPCM_SBPRO_4,
324 AV_CODEC_ID_ADPCM_SBPRO_3,
325 AV_CODEC_ID_ADPCM_SBPRO_2,
326 AV_CODEC_ID_ADPCM_THP,
327 AV_CODEC_ID_ADPCM_IMA_AMV,
328 AV_CODEC_ID_ADPCM_EA_R1,
329 AV_CODEC_ID_ADPCM_EA_R3,
330 AV_CODEC_ID_ADPCM_EA_R2,
331 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
332 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
333 AV_CODEC_ID_ADPCM_EA_XAS,
334 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
335 AV_CODEC_ID_ADPCM_IMA_ISS,
336 AV_CODEC_ID_ADPCM_G722,
337 AV_CODEC_ID_ADPCM_IMA_APC,
340 AV_CODEC_ID_AMR_NB = 0x12000,
343 /* RealAudio codecs*/
344 AV_CODEC_ID_RA_144 = 0x13000,
347 /* various DPCM codecs */
348 AV_CODEC_ID_ROQ_DPCM = 0x14000,
349 AV_CODEC_ID_INTERPLAY_DPCM,
350 AV_CODEC_ID_XAN_DPCM,
351 AV_CODEC_ID_SOL_DPCM,
354 AV_CODEC_ID_MP2 = 0x15000,
355 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
365 AV_CODEC_ID_VMDAUDIO,
371 AV_CODEC_ID_WESTWOOD_SND1,
372 AV_CODEC_ID_GSM, ///< as in Berlin toast format
375 AV_CODEC_ID_TRUESPEECH,
377 AV_CODEC_ID_SMACKAUDIO,
380 AV_CODEC_ID_DSICINAUDIO,
382 AV_CODEC_ID_MUSEPACK7,
384 AV_CODEC_ID_GSM_MS, /* as found in WAV */
388 AV_CODEC_ID_NELLYMOSER,
389 AV_CODEC_ID_MUSEPACK8,
391 AV_CODEC_ID_WMAVOICE,
393 AV_CODEC_ID_WMALOSSLESS,
402 AV_CODEC_ID_BINKAUDIO_RDFT,
403 AV_CODEC_ID_BINKAUDIO_DCT,
404 AV_CODEC_ID_AAC_LATM,
409 AV_CODEC_ID_8SVX_EXP,
410 AV_CODEC_ID_8SVX_FIB,
411 AV_CODEC_ID_BMV_AUDIO,
416 AV_CODEC_ID_COMFORT_NOISE,
419 /* subtitle codecs */
420 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
421 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
422 AV_CODEC_ID_DVB_SUBTITLE,
423 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
426 AV_CODEC_ID_MOV_TEXT,
427 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
428 AV_CODEC_ID_DVB_TELETEXT,
431 /* other specific kind of codecs (generally used for attachments) */
432 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
433 AV_CODEC_ID_TTF = 0x18000,
435 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
437 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
438 * stream (only used by libavformat) */
439 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
440 * stream (only used by libavformat) */
441 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
445 * This struct describes the properties of a single codec described by an
447 * @see avcodec_get_descriptor()
449 typedef struct AVCodecDescriptor {
451 enum AVMediaType type;
453 * Name of the codec described by this descriptor. It is non-empty and
454 * unique for each codec descriptor. It should contain alphanumeric
455 * characters and '_' only.
459 * A more descriptive name for this codec. May be NULL.
461 const char *long_name;
463 * Codec properties, a combination of AV_CODEC_PROP_* flags.
469 * Codec uses only intra compression.
472 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
474 * Codec supports lossy compression. Audio and video codecs only.
475 * @note a codec may support both lossy and lossless
478 #define AV_CODEC_PROP_LOSSY (1 << 1)
480 * Codec supports lossless compression. Audio and video codecs only.
482 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
485 * @ingroup lavc_decoding
486 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
487 * This is mainly needed because some optimized bitstream readers read
488 * 32 or 64 bit at once and could read over the end.<br>
489 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
490 * MPEG bitstreams could cause overread and segfault.
492 #define FF_INPUT_BUFFER_PADDING_SIZE 8
495 * @ingroup lavc_encoding
496 * minimum encoding buffer size
497 * Used to avoid some checks during header writing.
499 #define FF_MIN_BUFFER_SIZE 16384
503 * @ingroup lavc_encoding
504 * motion estimation type.
507 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
511 ME_EPZS, ///< enhanced predictive zonal search
512 ME_X1, ///< reserved for experiments
513 ME_HEX, ///< hexagon based search
514 ME_UMH, ///< uneven multi-hexagon search
515 ME_TESA, ///< transformed exhaustive search algorithm
519 * @ingroup lavc_decoding
522 /* We leave some space between them for extensions (drop some
523 * keyframes for intra-only or drop just some bidir frames). */
524 AVDISCARD_NONE =-16, ///< discard nothing
525 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
526 AVDISCARD_NONREF = 8, ///< discard all non reference
527 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
528 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
529 AVDISCARD_ALL = 48, ///< discard all
532 enum AVColorPrimaries{
533 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
534 AVCOL_PRI_UNSPECIFIED = 2,
535 AVCOL_PRI_BT470M = 4,
536 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
537 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
538 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
540 AVCOL_PRI_NB , ///< Not part of ABI
543 enum AVColorTransferCharacteristic{
544 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
545 AVCOL_TRC_UNSPECIFIED = 2,
546 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
547 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
548 AVCOL_TRC_SMPTE240M = 7,
549 AVCOL_TRC_NB , ///< Not part of ABI
554 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
555 AVCOL_SPC_UNSPECIFIED = 2,
557 AVCOL_SPC_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
558 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
559 AVCOL_SPC_SMPTE240M = 7,
560 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
561 AVCOL_SPC_NB , ///< Not part of ABI
565 AVCOL_RANGE_UNSPECIFIED = 0,
566 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
567 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
568 AVCOL_RANGE_NB , ///< Not part of ABI
572 * X X 3 4 X X are luma samples,
573 * 1 2 1-6 are possible chroma positions
574 * X X 5 6 X 0 is undefined/unknown position
576 enum AVChromaLocation{
577 AVCHROMA_LOC_UNSPECIFIED = 0,
578 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
579 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
580 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
581 AVCHROMA_LOC_TOP = 4,
582 AVCHROMA_LOC_BOTTOMLEFT = 5,
583 AVCHROMA_LOC_BOTTOM = 6,
584 AVCHROMA_LOC_NB , ///< Not part of ABI
587 enum AVAudioServiceType {
588 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
589 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
590 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
591 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
592 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
593 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
594 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
595 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
596 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
597 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
601 * @ingroup lavc_encoding
603 typedef struct RcOverride{
606 int qscale; // If this is 0 then quality_factor will be used instead.
607 float quality_factor;
610 #define FF_MAX_B_FRAMES 16
613 These flags can be passed in AVCodecContext.flags before initialization.
614 Note: Not everything is supported yet.
618 * Allow decoders to produce frames with data planes that are not aligned
619 * to CPU requirements (e.g. due to cropping).
621 #define CODEC_FLAG_UNALIGNED 0x0001
622 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
623 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
624 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
625 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
626 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
628 * The parent program guarantees that the input for B-frames containing
629 * streams is not written to for at least s->max_b_frames+1 frames, if
630 * this is not set the input will be copied.
632 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
633 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
634 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
635 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
636 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
637 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
638 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
639 location instead of only at frame boundaries. */
640 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
641 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
642 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
643 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
644 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
645 /* Fx : Flag for h263+ extra options */
646 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
647 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
648 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
649 #define CODEC_FLAG_CLOSED_GOP 0x80000000
650 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
651 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
652 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
653 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
655 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
657 /* Unsupported options :
658 * Syntax Arithmetic coding (SAC)
659 * Reference Picture Selection
660 * Independent Segment Decoding */
662 /* codec capabilities */
664 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
666 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
667 * If not set, it might not use get_buffer() at all or use operations that
668 * assume the buffer was allocated by avcodec_default_get_buffer.
670 #define CODEC_CAP_DR1 0x0002
671 #define CODEC_CAP_TRUNCATED 0x0008
672 /* Codec can export data for HW decoding (XvMC). */
673 #define CODEC_CAP_HWACCEL 0x0010
675 * Encoder or decoder requires flushing with NULL input at the end in order to
676 * give the complete and correct output.
678 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
679 * with NULL data. The user can still send NULL data to the public encode
680 * or decode function, but libavcodec will not pass it along to the codec
681 * unless this flag is set.
684 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
685 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
689 * The encoder needs to be fed with NULL data at the end of encoding until the
690 * encoder no longer returns data.
692 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
693 * flag also means that the encoder must set the pts and duration for
694 * each output packet. If this flag is not set, the pts and duration will
695 * be determined by libavcodec from the input frame.
697 #define CODEC_CAP_DELAY 0x0020
699 * Codec can be fed a final frame with a smaller size.
700 * This can be used to prevent truncation of the last audio samples.
702 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
704 * Codec can export data for HW decoding (VDPAU).
706 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
708 * Codec can output multiple frames per AVPacket
709 * Normally demuxers return one frame at a time, demuxers which do not do
710 * are connected to a parser to split what they return into proper frames.
711 * This flag is reserved to the very rare category of codecs which have a
712 * bitstream that cannot be split into frames without timeconsuming
713 * operations like full decoding. Demuxers carring such bitstreams thus
714 * may return multiple frames in a packet. This has many disadvantages like
715 * prohibiting stream copy in many cases thus it should only be considered
718 #define CODEC_CAP_SUBFRAMES 0x0100
720 * Codec is experimental and is thus avoided in favor of non experimental
723 #define CODEC_CAP_EXPERIMENTAL 0x0200
725 * Codec should fill in channel configuration and samplerate instead of container
727 #define CODEC_CAP_CHANNEL_CONF 0x0400
729 * Codec is able to deal with negative linesizes
731 #define CODEC_CAP_NEG_LINESIZES 0x0800
733 * Codec supports frame-level multithreading.
735 #define CODEC_CAP_FRAME_THREADS 0x1000
737 * Codec supports slice-based (or partition-based) multithreading.
739 #define CODEC_CAP_SLICE_THREADS 0x2000
741 * Codec supports changed parameters at any point.
743 #define CODEC_CAP_PARAM_CHANGE 0x4000
745 * Codec supports avctx->thread_count == 0 (auto).
747 #define CODEC_CAP_AUTO_THREADS 0x8000
749 * Audio encoder supports receiving a different number of samples in each call.
751 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
753 //The following defines may change, don't expect compatibility if you use them.
754 #define MB_TYPE_INTRA4x4 0x0001
755 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
756 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
757 #define MB_TYPE_16x16 0x0008
758 #define MB_TYPE_16x8 0x0010
759 #define MB_TYPE_8x16 0x0020
760 #define MB_TYPE_8x8 0x0040
761 #define MB_TYPE_INTERLACED 0x0080
762 #define MB_TYPE_DIRECT2 0x0100 //FIXME
763 #define MB_TYPE_ACPRED 0x0200
764 #define MB_TYPE_GMC 0x0400
765 #define MB_TYPE_SKIP 0x0800
766 #define MB_TYPE_P0L0 0x1000
767 #define MB_TYPE_P1L0 0x2000
768 #define MB_TYPE_P0L1 0x4000
769 #define MB_TYPE_P1L1 0x8000
770 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
771 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
772 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
773 #define MB_TYPE_QUANT 0x00010000
774 #define MB_TYPE_CBP 0x00020000
775 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
779 * This specifies the area which should be displayed.
780 * Note there may be multiple such areas for one frame.
782 typedef struct AVPanScan{
785 * - encoding: Set by user.
786 * - decoding: Set by libavcodec.
791 * width and height in 1/16 pel
792 * - encoding: Set by user.
793 * - decoding: Set by libavcodec.
799 * position of the top left corner in 1/16 pel for up to 3 fields/frames
800 * - encoding: Set by user.
801 * - decoding: Set by libavcodec.
803 int16_t position[3][2];
806 #define FF_QSCALE_TYPE_MPEG1 0
807 #define FF_QSCALE_TYPE_MPEG2 1
808 #define FF_QSCALE_TYPE_H264 2
809 #define FF_QSCALE_TYPE_VP56 3
811 #if FF_API_GET_BUFFER
812 #define FF_BUFFER_TYPE_INTERNAL 1
813 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
814 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
815 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
817 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
818 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
819 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
820 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
824 * The decoder will keep a reference to the frame and may reuse it later.
826 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
829 * @defgroup lavc_packet AVPacket
831 * Types and functions for working with AVPacket.
834 enum AVPacketSideDataType {
836 AV_PKT_DATA_NEW_EXTRADATA,
839 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
842 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
843 * s32le channel_count
844 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
845 * u64le channel_layout
846 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
848 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
853 AV_PKT_DATA_PARAM_CHANGE,
856 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
857 * structures with info about macroblocks relevant to splitting the
858 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
859 * That is, it does not necessarily contain info about all macroblocks,
860 * as long as the distance between macroblocks in the info is smaller
861 * than the target payload size.
862 * Each MB info structure is 12 bytes, and is laid out as follows:
864 * u32le bit offset from the start of the packet
865 * u8 current quantizer at the start of the macroblock
867 * u16le macroblock address within the GOB
868 * u8 horizontal MV predictor
869 * u8 vertical MV predictor
870 * u8 horizontal MV predictor for block number 3
871 * u8 vertical MV predictor for block number 3
874 AV_PKT_DATA_H263_MB_INFO,
878 * This structure stores compressed data. It is typically exported by demuxers
879 * and then passed as input to decoders, or received as output from encoders and
880 * then passed to muxers.
882 * For video, it should typically contain one compressed frame. For audio it may
883 * contain several compressed frames.
885 * AVPacket is one of the few structs in Libav, whose size is a part of public
886 * ABI. Thus it may be allocated on stack and no new fields can be added to it
887 * without libavcodec and libavformat major bump.
889 * The semantics of data ownership depends on the buf or destruct (deprecated)
890 * fields. If either is set, the packet data is dynamically allocated and is
891 * valid indefinitely until av_free_packet() is called (which in turn calls
892 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
893 * the packet data is typically backed by some static buffer somewhere and is
894 * only valid for a limited time (e.g. until the next read call when demuxing).
896 * The side data is always allocated with av_malloc() and is freed in
899 typedef struct AVPacket {
901 * A reference to the reference-counted buffer where the packet data is
903 * May be NULL, then the packet data is not reference-counted.
907 * Presentation timestamp in AVStream->time_base units; the time at which
908 * the decompressed packet will be presented to the user.
909 * Can be AV_NOPTS_VALUE if it is not stored in the file.
910 * pts MUST be larger or equal to dts as presentation cannot happen before
911 * decompression, unless one wants to view hex dumps. Some formats misuse
912 * the terms dts and pts/cts to mean something different. Such timestamps
913 * must be converted to true pts/dts before they are stored in AVPacket.
917 * Decompression timestamp in AVStream->time_base units; the time at which
918 * the packet is decompressed.
919 * Can be AV_NOPTS_VALUE if it is not stored in the file.
926 * A combination of AV_PKT_FLAG values
930 * Additional packet data that can be provided by the container.
931 * Packet can contain several types of side information.
936 enum AVPacketSideDataType type;
941 * Duration of this packet in AVStream->time_base units, 0 if unknown.
942 * Equals next_pts - this_pts in presentation order.
945 #if FF_API_DESTRUCT_PACKET
947 void (*destruct)(struct AVPacket *);
951 int64_t pos; ///< byte position in stream, -1 if unknown
954 * Time difference in AVStream->time_base units from the pts of this
955 * packet to the point at which the output from the decoder has converged
956 * independent from the availability of previous frames. That is, the
957 * frames are virtually identical no matter if decoding started from
958 * the very first frame or from this keyframe.
959 * Is AV_NOPTS_VALUE if unknown.
960 * This field is not the display duration of the current packet.
961 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
964 * The purpose of this field is to allow seeking in streams that have no
965 * keyframes in the conventional sense. It corresponds to the
966 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
967 * essential for some types of subtitle streams to ensure that all
968 * subtitles are correctly displayed after seeking.
970 int64_t convergence_duration;
972 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
973 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
975 enum AVSideDataParamChangeFlags {
976 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
977 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
978 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
979 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
985 struct AVCodecInternal;
989 AV_FIELD_PROGRESSIVE,
990 AV_FIELD_TT, //< Top coded_first, top displayed first
991 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
992 AV_FIELD_TB, //< Top coded first, bottom displayed first
993 AV_FIELD_BT, //< Bottom coded first, top displayed first
997 * main external API structure.
998 * New fields can be added to the end with minor version bumps.
999 * Removal, reordering and changes to existing fields require a major
1001 * sizeof(AVCodecContext) must not be used outside libav*.
1003 typedef struct AVCodecContext {
1005 * information on struct for av_log
1006 * - set by avcodec_alloc_context3
1008 const AVClass *av_class;
1009 int log_level_offset;
1011 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1012 const struct AVCodec *codec;
1013 char codec_name[32];
1014 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1017 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1018 * This is used to work around some encoder bugs.
1019 * A demuxer should set this to what is stored in the field used to identify the codec.
1020 * If there are multiple such fields in a container then the demuxer should choose the one
1021 * which maximizes the information about the used codec.
1022 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1023 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1024 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1026 * - encoding: Set by user, if not then the default based on codec_id will be used.
1027 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1029 unsigned int codec_tag;
1032 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1033 * This is used to work around some encoder bugs.
1034 * - encoding: unused
1035 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1037 unsigned int stream_codec_tag;
1042 * Private context used for internal data.
1044 * Unlike priv_data, this is not codec-specific. It is used in general
1045 * libavcodec functions.
1047 struct AVCodecInternal *internal;
1050 * Private data of the user, can be used to carry app specific stuff.
1051 * - encoding: Set by user.
1052 * - decoding: Set by user.
1057 * the average bitrate
1058 * - encoding: Set by user; unused for constant quantizer encoding.
1059 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1064 * number of bits the bitstream is allowed to diverge from the reference.
1065 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1066 * - encoding: Set by user; unused for constant quantizer encoding.
1067 * - decoding: unused
1069 int bit_rate_tolerance;
1072 * Global quality for codecs which cannot change it per frame.
1073 * This should be proportional to MPEG-1/2/4 qscale.
1074 * - encoding: Set by user.
1075 * - decoding: unused
1080 * - encoding: Set by user.
1081 * - decoding: unused
1083 int compression_level;
1084 #define FF_COMPRESSION_DEFAULT -1
1088 * - encoding: Set by user.
1089 * - decoding: Set by user.
1095 * - encoding: Set by user.
1096 * - decoding: Set by user.
1101 * some codecs need / can use extradata like Huffman tables.
1102 * mjpeg: Huffman tables
1103 * rv10: additional flags
1104 * mpeg4: global headers (they can be in the bitstream or here)
1105 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1106 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1107 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1108 * - encoding: Set/allocated/freed by libavcodec.
1109 * - decoding: Set/allocated/freed by user.
1115 * This is the fundamental unit of time (in seconds) in terms
1116 * of which frame timestamps are represented. For fixed-fps content,
1117 * timebase should be 1/framerate and timestamp increments should be
1119 * - encoding: MUST be set by user.
1120 * - decoding: Set by libavcodec.
1122 AVRational time_base;
1125 * For some codecs, the time base is closer to the field rate than the frame rate.
1126 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1127 * if no telecine is used ...
1129 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1131 int ticks_per_frame;
1137 * Number of frames the decoded output will be delayed relative to the
1141 * For encoding, this is the number of "priming" samples added to the
1142 * beginning of the stream. The decoded output will be delayed by this
1143 * many samples relative to the input to the encoder. Note that this
1144 * field is purely informational and does not directly affect the pts
1145 * output by the encoder, which should always be based on the actual
1146 * presentation time, including any delay.
1147 * For decoding, this is the number of samples the decoder needs to
1148 * output before the decoder's output is valid. When seeking, you should
1149 * start decoding this many samples prior to your desired seek point.
1151 * - encoding: Set by libavcodec.
1152 * - decoding: Set by libavcodec.
1159 * picture width / height.
1160 * - encoding: MUST be set by user.
1161 * - decoding: May be set by the user before opening the decoder if known e.g.
1162 * from the container. Some decoders will require the dimensions
1163 * to be set by the caller. During decoding, the decoder may
1164 * overwrite those values as required.
1169 * Bitstream width / height, may be different from width/height e.g. when
1170 * the decoded frame is cropped before being output.
1171 * - encoding: unused
1172 * - decoding: May be set by the user before opening the decoder if known
1173 * e.g. from the container. During decoding, the decoder may
1174 * overwrite those values as required.
1176 int coded_width, coded_height;
1178 #define FF_ASPECT_EXTENDED 15
1181 * the number of pictures in a group of pictures, or 0 for intra_only
1182 * - encoding: Set by user.
1183 * - decoding: unused
1188 * Pixel format, see AV_PIX_FMT_xxx.
1189 * May be set by the demuxer if known from headers.
1190 * May be overriden by the decoder if it knows better.
1191 * - encoding: Set by user.
1192 * - decoding: Set by user if known, overridden by libavcodec if known
1194 enum AVPixelFormat pix_fmt;
1197 * Motion estimation algorithm used for video coding.
1198 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1199 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1200 * - encoding: MUST be set by user.
1201 * - decoding: unused
1206 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1207 * decoder to draw a horizontal band. It improves cache usage. Not
1208 * all codecs can do that. You must check the codec capabilities
1210 * When multithreading is used, it may be called from multiple threads
1211 * at the same time; threads might draw different parts of the same AVFrame,
1212 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1214 * The function is also used by hardware acceleration APIs.
1215 * It is called at least once during frame decoding to pass
1216 * the data needed for hardware render.
1217 * In that mode instead of pixel data, AVFrame points to
1218 * a structure specific to the acceleration API. The application
1219 * reads the structure and can change some fields to indicate progress
1221 * - encoding: unused
1222 * - decoding: Set by user.
1223 * @param height the height of the slice
1224 * @param y the y position of the slice
1225 * @param type 1->top field, 2->bottom field, 3->frame
1226 * @param offset offset into the AVFrame.data from which the slice should be read
1228 void (*draw_horiz_band)(struct AVCodecContext *s,
1229 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1230 int y, int type, int height);
1233 * callback to negotiate the pixelFormat
1234 * @param fmt is the list of formats which are supported by the codec,
1235 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1236 * The first is always the native one.
1237 * @return the chosen format
1238 * - encoding: unused
1239 * - decoding: Set by user, if not set the native format will be chosen.
1241 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1244 * maximum number of B-frames between non-B-frames
1245 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1246 * - encoding: Set by user.
1247 * - decoding: unused
1252 * qscale factor between IP and B-frames
1253 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1254 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1255 * - encoding: Set by user.
1256 * - decoding: unused
1258 float b_quant_factor;
1260 /** obsolete FIXME remove */
1262 #define FF_RC_STRATEGY_XVID 1
1264 int b_frame_strategy;
1267 * qscale offset between IP and B-frames
1268 * - encoding: Set by user.
1269 * - decoding: unused
1271 float b_quant_offset;
1274 * Size of the frame reordering buffer in the decoder.
1275 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1276 * - encoding: Set by libavcodec.
1277 * - decoding: Set by libavcodec.
1282 * 0-> h263 quant 1-> mpeg quant
1283 * - encoding: Set by user.
1284 * - decoding: unused
1289 * qscale factor between P and I-frames
1290 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1291 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1292 * - encoding: Set by user.
1293 * - decoding: unused
1295 float i_quant_factor;
1298 * qscale offset between P and I-frames
1299 * - encoding: Set by user.
1300 * - decoding: unused
1302 float i_quant_offset;
1305 * luminance masking (0-> disabled)
1306 * - encoding: Set by user.
1307 * - decoding: unused
1312 * temporary complexity masking (0-> disabled)
1313 * - encoding: Set by user.
1314 * - decoding: unused
1316 float temporal_cplx_masking;
1319 * spatial complexity masking (0-> disabled)
1320 * - encoding: Set by user.
1321 * - decoding: unused
1323 float spatial_cplx_masking;
1326 * p block masking (0-> disabled)
1327 * - encoding: Set by user.
1328 * - decoding: unused
1333 * darkness masking (0-> disabled)
1334 * - encoding: Set by user.
1335 * - decoding: unused
1341 * - encoding: Set by libavcodec.
1342 * - decoding: Set by user (or 0).
1346 * prediction method (needed for huffyuv)
1347 * - encoding: Set by user.
1348 * - decoding: unused
1350 int prediction_method;
1351 #define FF_PRED_LEFT 0
1352 #define FF_PRED_PLANE 1
1353 #define FF_PRED_MEDIAN 2
1356 * slice offsets in the frame in bytes
1357 * - encoding: Set/allocated by libavcodec.
1358 * - decoding: Set/allocated by user (or NULL).
1363 * sample aspect ratio (0 if unknown)
1364 * That is the width of a pixel divided by the height of the pixel.
1365 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1366 * - encoding: Set by user.
1367 * - decoding: Set by libavcodec.
1369 AVRational sample_aspect_ratio;
1372 * motion estimation comparison function
1373 * - encoding: Set by user.
1374 * - decoding: unused
1378 * subpixel motion estimation comparison function
1379 * - encoding: Set by user.
1380 * - decoding: unused
1384 * macroblock comparison function (not supported yet)
1385 * - encoding: Set by user.
1386 * - decoding: unused
1390 * interlaced DCT comparison function
1391 * - encoding: Set by user.
1392 * - decoding: unused
1395 #define FF_CMP_SAD 0
1396 #define FF_CMP_SSE 1
1397 #define FF_CMP_SATD 2
1398 #define FF_CMP_DCT 3
1399 #define FF_CMP_PSNR 4
1400 #define FF_CMP_BIT 5
1402 #define FF_CMP_ZERO 7
1403 #define FF_CMP_VSAD 8
1404 #define FF_CMP_VSSE 9
1405 #define FF_CMP_NSSE 10
1406 #define FF_CMP_DCTMAX 13
1407 #define FF_CMP_DCT264 14
1408 #define FF_CMP_CHROMA 256
1411 * ME diamond size & shape
1412 * - encoding: Set by user.
1413 * - decoding: unused
1418 * amount of previous MV predictors (2a+1 x 2a+1 square)
1419 * - encoding: Set by user.
1420 * - decoding: unused
1422 int last_predictor_count;
1425 * prepass for motion estimation
1426 * - encoding: Set by user.
1427 * - decoding: unused
1432 * motion estimation prepass comparison function
1433 * - encoding: Set by user.
1434 * - decoding: unused
1439 * ME prepass diamond size & shape
1440 * - encoding: Set by user.
1441 * - decoding: unused
1447 * - encoding: Set by user.
1448 * - decoding: unused
1450 int me_subpel_quality;
1453 * DTG active format information (additional aspect ratio
1454 * information only used in DVB MPEG-2 transport streams)
1457 * - encoding: unused
1458 * - decoding: Set by decoder.
1460 int dtg_active_format;
1461 #define FF_DTG_AFD_SAME 8
1462 #define FF_DTG_AFD_4_3 9
1463 #define FF_DTG_AFD_16_9 10
1464 #define FF_DTG_AFD_14_9 11
1465 #define FF_DTG_AFD_4_3_SP_14_9 13
1466 #define FF_DTG_AFD_16_9_SP_14_9 14
1467 #define FF_DTG_AFD_SP_4_3 15
1470 * maximum motion estimation search range in subpel units
1471 * If 0 then no limit.
1473 * - encoding: Set by user.
1474 * - decoding: unused
1479 * intra quantizer bias
1480 * - encoding: Set by user.
1481 * - decoding: unused
1483 int intra_quant_bias;
1484 #define FF_DEFAULT_QUANT_BIAS 999999
1487 * inter quantizer bias
1488 * - encoding: Set by user.
1489 * - decoding: unused
1491 int inter_quant_bias;
1495 * - encoding: unused
1496 * - decoding: Set by user.
1499 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1500 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1501 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1504 * XVideo Motion Acceleration
1505 * - encoding: forbidden
1506 * - decoding: set by decoder
1508 int xvmc_acceleration;
1511 * macroblock decision mode
1512 * - encoding: Set by user.
1513 * - decoding: unused
1516 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1517 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1518 #define FF_MB_DECISION_RD 2 ///< rate distortion
1521 * custom intra quantization matrix
1522 * - encoding: Set by user, can be NULL.
1523 * - decoding: Set by libavcodec.
1525 uint16_t *intra_matrix;
1528 * custom inter quantization matrix
1529 * - encoding: Set by user, can be NULL.
1530 * - decoding: Set by libavcodec.
1532 uint16_t *inter_matrix;
1535 * scene change detection threshold
1536 * 0 is default, larger means fewer detected scene changes.
1537 * - encoding: Set by user.
1538 * - decoding: unused
1540 int scenechange_threshold;
1543 * noise reduction strength
1544 * - encoding: Set by user.
1545 * - decoding: unused
1547 int noise_reduction;
1550 * Motion estimation threshold below which no motion estimation is
1551 * performed, but instead the user specified motion vectors are used.
1553 * - encoding: Set by user.
1554 * - decoding: unused
1559 * Macroblock threshold below which the user specified macroblock types will be used.
1560 * - encoding: Set by user.
1561 * - decoding: unused
1566 * precision of the intra DC coefficient - 8
1567 * - encoding: Set by user.
1568 * - decoding: unused
1570 int intra_dc_precision;
1573 * Number of macroblock rows at the top which are skipped.
1574 * - encoding: unused
1575 * - decoding: Set by user.
1580 * Number of macroblock rows at the bottom which are skipped.
1581 * - encoding: unused
1582 * - decoding: Set by user.
1587 * Border processing masking, raises the quantizer for mbs on the borders
1589 * - encoding: Set by user.
1590 * - decoding: unused
1592 float border_masking;
1595 * minimum MB lagrange multipler
1596 * - encoding: Set by user.
1597 * - decoding: unused
1602 * maximum MB lagrange multipler
1603 * - encoding: Set by user.
1604 * - decoding: unused
1610 * - encoding: Set by user.
1611 * - decoding: unused
1613 int me_penalty_compensation;
1617 * - encoding: Set by user.
1618 * - decoding: unused
1624 * - encoding: Set by user.
1625 * - decoding: unused
1631 * - encoding: Set by user.
1632 * - decoding: unused
1637 * number of reference frames
1638 * - encoding: Set by user.
1639 * - decoding: Set by lavc.
1644 * chroma qp offset from luma
1645 * - encoding: Set by user.
1646 * - decoding: unused
1651 * Multiplied by qscale for each frame and added to scene_change_score.
1652 * - encoding: Set by user.
1653 * - decoding: unused
1655 int scenechange_factor;
1659 * Note: Value depends upon the compare function used for fullpel ME.
1660 * - encoding: Set by user.
1661 * - decoding: unused
1666 * Adjust sensitivity of b_frame_strategy 1.
1667 * - encoding: Set by user.
1668 * - decoding: unused
1673 * Chromaticity coordinates of the source primaries.
1674 * - encoding: Set by user
1675 * - decoding: Set by libavcodec
1677 enum AVColorPrimaries color_primaries;
1680 * Color Transfer Characteristic.
1681 * - encoding: Set by user
1682 * - decoding: Set by libavcodec
1684 enum AVColorTransferCharacteristic color_trc;
1687 * YUV colorspace type.
1688 * - encoding: Set by user
1689 * - decoding: Set by libavcodec
1691 enum AVColorSpace colorspace;
1694 * MPEG vs JPEG YUV range.
1695 * - encoding: Set by user
1696 * - decoding: Set by libavcodec
1698 enum AVColorRange color_range;
1701 * This defines the location of chroma samples.
1702 * - encoding: Set by user
1703 * - decoding: Set by libavcodec
1705 enum AVChromaLocation chroma_sample_location;
1709 * Indicates number of picture subdivisions. Used for parallelized
1711 * - encoding: Set by user
1712 * - decoding: unused
1717 * - encoding: set by libavcodec
1718 * - decoding: Set by libavcodec
1720 enum AVFieldOrder field_order;
1723 int sample_rate; ///< samples per second
1724 int channels; ///< number of audio channels
1727 * audio sample format
1728 * - encoding: Set by user.
1729 * - decoding: Set by libavcodec.
1731 enum AVSampleFormat sample_fmt; ///< sample format
1733 /* The following data should not be initialized. */
1735 * Number of samples per channel in an audio frame.
1737 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1738 * except the last must contain exactly frame_size samples per channel.
1739 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1740 * frame size is not restricted.
1741 * - decoding: may be set by some decoders to indicate constant frame size
1746 * Frame counter, set by libavcodec.
1748 * - decoding: total number of frames returned from the decoder so far.
1749 * - encoding: total number of frames passed to the encoder so far.
1751 * @note the counter is not incremented if encoding/decoding resulted in
1757 * number of bytes per packet if constant and known or 0
1758 * Used by some WAV based audio codecs.
1763 * Audio cutoff bandwidth (0 means "automatic")
1764 * - encoding: Set by user.
1765 * - decoding: unused
1769 #if FF_API_REQUEST_CHANNELS
1771 * Decoder should decode to this many channels if it can (0 for default)
1772 * - encoding: unused
1773 * - decoding: Set by user.
1774 * @deprecated Deprecated in favor of request_channel_layout.
1776 attribute_deprecated int request_channels;
1780 * Audio channel layout.
1781 * - encoding: set by user.
1782 * - decoding: set by libavcodec.
1784 uint64_t channel_layout;
1787 * Request decoder to use this channel layout if it can (0 for default)
1788 * - encoding: unused
1789 * - decoding: Set by user.
1791 uint64_t request_channel_layout;
1794 * Type of service that the audio stream conveys.
1795 * - encoding: Set by user.
1796 * - decoding: Set by libavcodec.
1798 enum AVAudioServiceType audio_service_type;
1801 * Used to request a sample format from the decoder.
1802 * - encoding: unused.
1803 * - decoding: Set by user.
1805 enum AVSampleFormat request_sample_fmt;
1807 #if FF_API_GET_BUFFER
1809 * Called at the beginning of each frame to get a buffer for it.
1811 * The function will set AVFrame.data[], AVFrame.linesize[].
1812 * AVFrame.extended_data[] must also be set, but it should be the same as
1813 * AVFrame.data[] except for planar audio with more channels than can fit
1814 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1815 * many data pointers as it can hold.
1817 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1818 * avcodec_default_get_buffer() instead of providing buffers allocated by
1821 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1822 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1823 * but if get_buffer() is overridden then alignment considerations should
1824 * be taken into account.
1826 * @see avcodec_default_get_buffer()
1830 * If pic.reference is set then the frame will be read later by libavcodec.
1831 * avcodec_align_dimensions2() should be used to find the required width and
1832 * height, as they normally need to be rounded up to the next multiple of 16.
1834 * If frame multithreading is used and thread_safe_callbacks is set,
1835 * it may be called from a different thread, but not from more than one at
1836 * once. Does not need to be reentrant.
1838 * @see release_buffer(), reget_buffer()
1839 * @see avcodec_align_dimensions2()
1843 * Decoders request a buffer of a particular size by setting
1844 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1845 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1846 * to a smaller value in the output frame.
1848 * Decoders cannot use the buffer after returning from
1849 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1850 * is assumed to be released immediately upon return. In some rare cases,
1851 * a decoder may need to call get_buffer() more than once in a single
1852 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1853 * called again after it has already been called once, the previously
1854 * acquired buffer is assumed to be released at that time and may not be
1855 * reused by the decoder.
1857 * As a convenience, av_samples_get_buffer_size() and
1858 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1859 * functions to find the required data size and to fill data pointers and
1860 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1861 * since all planes must be the same size.
1863 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1865 * - encoding: unused
1866 * - decoding: Set by libavcodec, user can override.
1868 * @deprecated use get_buffer2()
1870 attribute_deprecated
1871 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1874 * Called to release buffers which were allocated with get_buffer.
1875 * A released buffer can be reused in get_buffer().
1876 * pic.data[*] must be set to NULL.
1877 * May be called from a different thread if frame multithreading is used,
1878 * but not by more than one thread at once, so does not need to be reentrant.
1879 * - encoding: unused
1880 * - decoding: Set by libavcodec, user can override.
1882 * @deprecated custom freeing callbacks should be set from get_buffer2()
1884 attribute_deprecated
1885 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1888 * Called at the beginning of a frame to get cr buffer for it.
1889 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1890 * libavcodec will pass previous buffer in pic, function should return
1891 * same buffer or new buffer with old frame "painted" into it.
1892 * If pic.data[0] == NULL must behave like get_buffer().
1893 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1894 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1896 * - encoding: unused
1897 * - decoding: Set by libavcodec, user can override.
1899 attribute_deprecated
1900 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1904 * This callback is called at the beginning of each frame to get data
1905 * buffer(s) for it. There may be one contiguous buffer for all the data or
1906 * there may be a buffer per each data plane or anything in between. What
1907 * this means is, you may set however many entries in buf[] you feel necessary.
1908 * Each buffer must be reference-counted using the AVBuffer API (see description
1911 * The following fields will be set in the frame before this callback is
1914 * - width, height (video only)
1915 * - sample_rate, channel_layout, nb_samples (audio only)
1916 * Their values may differ from the corresponding values in
1917 * AVCodecContext. This callback must use the frame values, not the codec
1918 * context values, to calculate the required buffer size.
1920 * This callback must fill the following fields in the frame:
1924 * * if the data is planar audio with more than 8 channels, then this
1925 * callback must allocate and fill extended_data to contain all pointers
1926 * to all data planes. data[] must hold as many pointers as it can.
1927 * extended_data must be allocated with av_malloc() and will be freed in
1929 * * otherwise exended_data must point to data
1930 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1931 * the frame's data and extended_data pointers must be contained in these. That
1932 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1933 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1934 * and av_buffer_ref().
1935 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1936 * this callback and filled with the extra buffers if there are more
1937 * buffers than buf[] can hold. extended_buf will be freed in
1940 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
1941 * avcodec_default_get_buffer2() instead of providing buffers allocated by
1944 * Each data plane must be aligned to the maximum required by the target
1947 * @see avcodec_default_get_buffer2()
1951 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
1952 * (read and/or written to if it is writable) later by libavcodec.
1954 * If CODEC_FLAG_EMU_EDGE is not set in s->flags, the buffer must contain an
1955 * edge of the size returned by avcodec_get_edge_width() on all sides.
1957 * avcodec_align_dimensions2() should be used to find the required width and
1958 * height, as they normally need to be rounded up to the next multiple of 16.
1960 * If frame multithreading is used and thread_safe_callbacks is set,
1961 * this callback may be called from a different thread, but not from more
1962 * than one at once. Does not need to be reentrant.
1964 * @see avcodec_align_dimensions2()
1968 * Decoders request a buffer of a particular size by setting
1969 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
1970 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1971 * to a smaller value in the output frame.
1973 * As a convenience, av_samples_get_buffer_size() and
1974 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
1975 * functions to find the required data size and to fill data pointers and
1976 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1977 * since all planes must be the same size.
1979 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1981 * - encoding: unused
1982 * - decoding: Set by libavcodec, user can override.
1984 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
1987 * If non-zero, the decoded audio and video frames returned from
1988 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
1989 * and are valid indefinitely. The caller must free them with
1990 * av_frame_unref() when they are not needed anymore.
1991 * Otherwise, the decoded frames must not be freed by the caller and are
1992 * only valid until the next decode call.
1994 * - encoding: unused
1995 * - decoding: set by the caller before avcodec_open2().
1997 int refcounted_frames;
1999 /* - encoding parameters */
2000 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2001 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2005 * - encoding: Set by user.
2006 * - decoding: unused
2012 * - encoding: Set by user.
2013 * - decoding: unused
2018 * maximum quantizer difference between frames
2019 * - encoding: Set by user.
2020 * - decoding: unused
2025 * ratecontrol qmin qmax limiting method
2026 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2027 * - encoding: Set by user.
2028 * - decoding: unused
2036 * decoder bitstream buffer size
2037 * - encoding: Set by user.
2038 * - decoding: unused
2043 * ratecontrol override, see RcOverride
2044 * - encoding: Allocated/set/freed by user.
2045 * - decoding: unused
2047 int rc_override_count;
2048 RcOverride *rc_override;
2051 * rate control equation
2052 * - encoding: Set by user
2053 * - decoding: unused
2059 * - encoding: Set by user.
2060 * - decoding: unused
2066 * - encoding: Set by user.
2067 * - decoding: unused
2071 float rc_buffer_aggressivity;
2074 * initial complexity for pass1 ratecontrol
2075 * - encoding: Set by user.
2076 * - decoding: unused
2078 float rc_initial_cplx;
2081 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2082 * - encoding: Set by user.
2083 * - decoding: unused.
2085 float rc_max_available_vbv_use;
2088 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2089 * - encoding: Set by user.
2090 * - decoding: unused.
2092 float rc_min_vbv_overflow_use;
2095 * Number of bits which should be loaded into the rc buffer before decoding starts.
2096 * - encoding: Set by user.
2097 * - decoding: unused
2099 int rc_initial_buffer_occupancy;
2101 #define FF_CODER_TYPE_VLC 0
2102 #define FF_CODER_TYPE_AC 1
2103 #define FF_CODER_TYPE_RAW 2
2104 #define FF_CODER_TYPE_RLE 3
2105 #define FF_CODER_TYPE_DEFLATE 4
2108 * - encoding: Set by user.
2109 * - decoding: unused
2115 * - encoding: Set by user.
2116 * - decoding: unused
2121 * minimum Lagrange multipler
2122 * - encoding: Set by user.
2123 * - decoding: unused
2128 * maximum Lagrange multipler
2129 * - encoding: Set by user.
2130 * - decoding: unused
2135 * frame skip threshold
2136 * - encoding: Set by user.
2137 * - decoding: unused
2139 int frame_skip_threshold;
2143 * - encoding: Set by user.
2144 * - decoding: unused
2146 int frame_skip_factor;
2149 * frame skip exponent
2150 * - encoding: Set by user.
2151 * - decoding: unused
2156 * frame skip comparison function
2157 * - encoding: Set by user.
2158 * - decoding: unused
2163 * trellis RD quantization
2164 * - encoding: Set by user.
2165 * - decoding: unused
2170 * - encoding: Set by user.
2171 * - decoding: unused
2173 int min_prediction_order;
2176 * - encoding: Set by user.
2177 * - decoding: unused
2179 int max_prediction_order;
2182 * GOP timecode frame start number, in non drop frame format
2183 * - encoding: Set by user.
2184 * - decoding: unused
2186 int64_t timecode_frame_start;
2188 /* The RTP callback: This function is called */
2189 /* every time the encoder has a packet to send. */
2190 /* It depends on the encoder if the data starts */
2191 /* with a Start Code (it should). H.263 does. */
2192 /* mb_nb contains the number of macroblocks */
2193 /* encoded in the RTP payload. */
2194 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2196 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2197 /* do its best to deliver a chunk with size */
2198 /* below rtp_payload_size, the chunk will start */
2199 /* with a start code on some codecs like H.263. */
2200 /* This doesn't take account of any particular */
2201 /* headers inside the transmitted RTP payload. */
2203 /* statistics, used for 2-pass encoding */
2214 * number of bits used for the previously encoded frame
2215 * - encoding: Set by libavcodec.
2216 * - decoding: unused
2221 * pass1 encoding statistics output buffer
2222 * - encoding: Set by libavcodec.
2223 * - decoding: unused
2228 * pass2 encoding statistics input buffer
2229 * Concatenated stuff from stats_out of pass1 should be placed here.
2230 * - encoding: Allocated/set/freed by user.
2231 * - decoding: unused
2236 * Work around bugs in encoders which sometimes cannot be detected automatically.
2237 * - encoding: Set by user
2238 * - decoding: Set by user
2240 int workaround_bugs;
2241 #define FF_BUG_AUTODETECT 1 ///< autodetection
2242 #define FF_BUG_OLD_MSMPEG4 2
2243 #define FF_BUG_XVID_ILACE 4
2244 #define FF_BUG_UMP4 8
2245 #define FF_BUG_NO_PADDING 16
2246 #define FF_BUG_AMV 32
2247 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2248 #define FF_BUG_QPEL_CHROMA 64
2249 #define FF_BUG_STD_QPEL 128
2250 #define FF_BUG_QPEL_CHROMA2 256
2251 #define FF_BUG_DIRECT_BLOCKSIZE 512
2252 #define FF_BUG_EDGE 1024
2253 #define FF_BUG_HPEL_CHROMA 2048
2254 #define FF_BUG_DC_CLIP 4096
2255 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2256 #define FF_BUG_TRUNCATED 16384
2259 * strictly follow the standard (MPEG4, ...).
2260 * - encoding: Set by user.
2261 * - decoding: Set by user.
2262 * Setting this to STRICT or higher means the encoder and decoder will
2263 * generally do stupid things, whereas setting it to unofficial or lower
2264 * will mean the encoder might produce output that is not supported by all
2265 * spec-compliant decoders. Decoders don't differentiate between normal,
2266 * unofficial and experimental (that is, they always try to decode things
2267 * when they can) unless they are explicitly asked to behave stupidly
2268 * (=strictly conform to the specs)
2270 int strict_std_compliance;
2271 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2272 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2273 #define FF_COMPLIANCE_NORMAL 0
2274 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2275 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2278 * error concealment flags
2279 * - encoding: unused
2280 * - decoding: Set by user.
2282 int error_concealment;
2283 #define FF_EC_GUESS_MVS 1
2284 #define FF_EC_DEBLOCK 2
2288 * - encoding: Set by user.
2289 * - decoding: Set by user.
2292 #define FF_DEBUG_PICT_INFO 1
2293 #define FF_DEBUG_RC 2
2294 #define FF_DEBUG_BITSTREAM 4
2295 #define FF_DEBUG_MB_TYPE 8
2296 #define FF_DEBUG_QP 16
2297 #define FF_DEBUG_MV 32
2298 #define FF_DEBUG_DCT_COEFF 0x00000040
2299 #define FF_DEBUG_SKIP 0x00000080
2300 #define FF_DEBUG_STARTCODE 0x00000100
2301 #define FF_DEBUG_PTS 0x00000200
2302 #define FF_DEBUG_ER 0x00000400
2303 #define FF_DEBUG_MMCO 0x00000800
2304 #define FF_DEBUG_BUGS 0x00001000
2305 #define FF_DEBUG_VIS_QP 0x00002000
2306 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2307 #define FF_DEBUG_BUFFERS 0x00008000
2308 #define FF_DEBUG_THREADS 0x00010000
2312 * - encoding: Set by user.
2313 * - decoding: Set by user.
2316 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2317 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2318 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2321 * Error recognition; may misdetect some more or less valid parts as errors.
2322 * - encoding: unused
2323 * - decoding: Set by user.
2325 int err_recognition;
2326 #define AV_EF_CRCCHECK (1<<0)
2327 #define AV_EF_BITSTREAM (1<<1)
2328 #define AV_EF_BUFFER (1<<2)
2329 #define AV_EF_EXPLODE (1<<3)
2332 * opaque 64bit number (generally a PTS) that will be reordered and
2333 * output in AVFrame.reordered_opaque
2334 * @deprecated in favor of pkt_pts
2335 * - encoding: unused
2336 * - decoding: Set by user.
2338 int64_t reordered_opaque;
2341 * Hardware accelerator in use
2342 * - encoding: unused.
2343 * - decoding: Set by libavcodec
2345 struct AVHWAccel *hwaccel;
2348 * Hardware accelerator context.
2349 * For some hardware accelerators, a global context needs to be
2350 * provided by the user. In that case, this holds display-dependent
2351 * data Libav cannot instantiate itself. Please refer to the
2352 * Libav HW accelerator documentation to know how to fill this
2353 * is. e.g. for VA API, this is a struct vaapi_context.
2354 * - encoding: unused
2355 * - decoding: Set by user
2357 void *hwaccel_context;
2361 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2362 * - decoding: unused
2364 uint64_t error[AV_NUM_DATA_POINTERS];
2367 * DCT algorithm, see FF_DCT_* below
2368 * - encoding: Set by user.
2369 * - decoding: unused
2372 #define FF_DCT_AUTO 0
2373 #define FF_DCT_FASTINT 1
2374 #define FF_DCT_INT 2
2375 #define FF_DCT_MMX 3
2376 #define FF_DCT_ALTIVEC 5
2377 #define FF_DCT_FAAN 6
2380 * IDCT algorithm, see FF_IDCT_* below.
2381 * - encoding: Set by user.
2382 * - decoding: Set by user.
2385 #define FF_IDCT_AUTO 0
2386 #define FF_IDCT_INT 1
2387 #define FF_IDCT_SIMPLE 2
2388 #define FF_IDCT_SIMPLEMMX 3
2389 #define FF_IDCT_ARM 7
2390 #define FF_IDCT_ALTIVEC 8
2391 #define FF_IDCT_SH4 9
2392 #define FF_IDCT_SIMPLEARM 10
2393 #define FF_IDCT_IPP 13
2394 #define FF_IDCT_XVIDMMX 14
2395 #define FF_IDCT_SIMPLEARMV5TE 16
2396 #define FF_IDCT_SIMPLEARMV6 17
2397 #define FF_IDCT_SIMPLEVIS 18
2398 #define FF_IDCT_FAAN 20
2399 #define FF_IDCT_SIMPLENEON 22
2400 #define FF_IDCT_SIMPLEALPHA 23
2403 * bits per sample/pixel from the demuxer (needed for huffyuv).
2404 * - encoding: Set by libavcodec.
2405 * - decoding: Set by user.
2407 int bits_per_coded_sample;
2410 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2411 * - encoding: set by user.
2412 * - decoding: set by libavcodec.
2414 int bits_per_raw_sample;
2418 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2419 * - encoding: unused
2420 * - decoding: Set by user.
2422 * @deprecated use decoder private options instead
2424 attribute_deprecated int lowres;
2428 * the picture in the bitstream
2429 * - encoding: Set by libavcodec.
2430 * - decoding: Set by libavcodec.
2432 AVFrame *coded_frame;
2436 * is used to decide how many independent tasks should be passed to execute()
2437 * - encoding: Set by user.
2438 * - decoding: Set by user.
2443 * Which multithreading methods to use.
2444 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2445 * so clients which cannot provide future frames should not use it.
2447 * - encoding: Set by user, otherwise the default is used.
2448 * - decoding: Set by user, otherwise the default is used.
2451 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2452 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2455 * Which multithreading methods are in use by the codec.
2456 * - encoding: Set by libavcodec.
2457 * - decoding: Set by libavcodec.
2459 int active_thread_type;
2462 * Set by the client if its custom get_buffer() callback can be called
2463 * synchronously from another thread, which allows faster multithreaded decoding.
2464 * draw_horiz_band() will be called from other threads regardless of this setting.
2465 * Ignored if the default get_buffer() is used.
2466 * - encoding: Set by user.
2467 * - decoding: Set by user.
2469 int thread_safe_callbacks;
2472 * The codec may call this to execute several independent things.
2473 * It will return only after finishing all tasks.
2474 * The user may replace this with some multithreaded implementation,
2475 * the default implementation will execute the parts serially.
2476 * @param count the number of things to execute
2477 * - encoding: Set by libavcodec, user can override.
2478 * - decoding: Set by libavcodec, user can override.
2480 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2483 * The codec may call this to execute several independent things.
2484 * It will return only after finishing all tasks.
2485 * The user may replace this with some multithreaded implementation,
2486 * the default implementation will execute the parts serially.
2487 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2488 * @param c context passed also to func
2489 * @param count the number of things to execute
2490 * @param arg2 argument passed unchanged to func
2491 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2492 * @param func function that will be called count times, with jobnr from 0 to count-1.
2493 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2494 * two instances of func executing at the same time will have the same threadnr.
2495 * @return always 0 currently, but code should handle a future improvement where when any call to func
2496 * returns < 0 no further calls to func may be done and < 0 is returned.
2497 * - encoding: Set by libavcodec, user can override.
2498 * - decoding: Set by libavcodec, user can override.
2500 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2504 * Can be used by execute() to store some per AVCodecContext stuff.
2505 * - encoding: set by execute()
2506 * - decoding: set by execute()
2508 void *thread_opaque;
2511 * noise vs. sse weight for the nsse comparsion function
2512 * - encoding: Set by user.
2513 * - decoding: unused
2519 * - encoding: Set by user.
2520 * - decoding: Set by libavcodec.
2523 #define FF_PROFILE_UNKNOWN -99
2524 #define FF_PROFILE_RESERVED -100
2526 #define FF_PROFILE_AAC_MAIN 0
2527 #define FF_PROFILE_AAC_LOW 1
2528 #define FF_PROFILE_AAC_SSR 2
2529 #define FF_PROFILE_AAC_LTP 3
2530 #define FF_PROFILE_AAC_HE 4
2531 #define FF_PROFILE_AAC_HE_V2 28
2532 #define FF_PROFILE_AAC_LD 22
2533 #define FF_PROFILE_AAC_ELD 38
2534 #define FF_PROFILE_MPEG2_AAC_LOW 128
2535 #define FF_PROFILE_MPEG2_AAC_HE 131
2537 #define FF_PROFILE_DTS 20
2538 #define FF_PROFILE_DTS_ES 30
2539 #define FF_PROFILE_DTS_96_24 40
2540 #define FF_PROFILE_DTS_HD_HRA 50
2541 #define FF_PROFILE_DTS_HD_MA 60
2543 #define FF_PROFILE_MPEG2_422 0
2544 #define FF_PROFILE_MPEG2_HIGH 1
2545 #define FF_PROFILE_MPEG2_SS 2
2546 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2547 #define FF_PROFILE_MPEG2_MAIN 4
2548 #define FF_PROFILE_MPEG2_SIMPLE 5
2550 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2551 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2553 #define FF_PROFILE_H264_BASELINE 66
2554 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2555 #define FF_PROFILE_H264_MAIN 77
2556 #define FF_PROFILE_H264_EXTENDED 88
2557 #define FF_PROFILE_H264_HIGH 100
2558 #define FF_PROFILE_H264_HIGH_10 110
2559 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2560 #define FF_PROFILE_H264_HIGH_422 122
2561 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2562 #define FF_PROFILE_H264_HIGH_444 144
2563 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2564 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2565 #define FF_PROFILE_H264_CAVLC_444 44
2567 #define FF_PROFILE_VC1_SIMPLE 0
2568 #define FF_PROFILE_VC1_MAIN 1
2569 #define FF_PROFILE_VC1_COMPLEX 2
2570 #define FF_PROFILE_VC1_ADVANCED 3
2572 #define FF_PROFILE_MPEG4_SIMPLE 0
2573 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2574 #define FF_PROFILE_MPEG4_CORE 2
2575 #define FF_PROFILE_MPEG4_MAIN 3
2576 #define FF_PROFILE_MPEG4_N_BIT 4
2577 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2578 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2579 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2580 #define FF_PROFILE_MPEG4_HYBRID 8
2581 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2582 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2583 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2584 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2585 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2586 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2587 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2589 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2590 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2591 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2592 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2593 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2597 * - encoding: Set by user.
2598 * - decoding: Set by libavcodec.
2601 #define FF_LEVEL_UNKNOWN -99
2605 * - encoding: unused
2606 * - decoding: Set by user.
2608 enum AVDiscard skip_loop_filter;
2612 * - encoding: unused
2613 * - decoding: Set by user.
2615 enum AVDiscard skip_idct;
2619 * - encoding: unused
2620 * - decoding: Set by user.
2622 enum AVDiscard skip_frame;
2625 * Header containing style information for text subtitles.
2626 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2627 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2628 * the Format line following. It shouldn't include any Dialogue line.
2629 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2630 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2632 uint8_t *subtitle_header;
2633 int subtitle_header_size;
2636 * Simulates errors in the bitstream to test error concealment.
2637 * - encoding: Set by user.
2638 * - decoding: unused
2643 * Current packet as passed into the decoder, to avoid having
2644 * to pass the packet into every function. Currently only valid
2645 * inside lavc and get/release_buffer callbacks.
2646 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2647 * - encoding: unused
2652 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2653 * Used for compliant TS muxing.
2654 * - encoding: Set by libavcodec.
2655 * - decoding: unused.
2663 typedef struct AVProfile {
2665 const char *name; ///< short name for the profile
2668 typedef struct AVCodecDefault AVCodecDefault;
2675 typedef struct AVCodec {
2677 * Name of the codec implementation.
2678 * The name is globally unique among encoders and among decoders (but an
2679 * encoder and a decoder can share the same name).
2680 * This is the primary way to find a codec from the user perspective.
2684 * Descriptive name for the codec, meant to be more human readable than name.
2685 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2687 const char *long_name;
2688 enum AVMediaType type;
2691 * Codec capabilities.
2695 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2696 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2697 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2698 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2699 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2700 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2701 const AVClass *priv_class; ///< AVClass for the private context
2702 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2704 /*****************************************************************
2705 * No fields below this line are part of the public API. They
2706 * may not be used outside of libavcodec and can be changed and
2708 * New public fields should be added right above.
2709 *****************************************************************
2712 struct AVCodec *next;
2714 * @name Frame-level threading support functions
2718 * If defined, called on thread contexts when they are created.
2719 * If the codec allocates writable tables in init(), re-allocate them here.
2720 * priv_data will be set to a copy of the original.
2722 int (*init_thread_copy)(AVCodecContext *);
2724 * Copy necessary context variables from a previous thread context to the current one.
2725 * If not defined, the next thread will start automatically; otherwise, the codec
2726 * must call ff_thread_finish_setup().
2728 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2730 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2734 * Private codec-specific defaults.
2736 const AVCodecDefault *defaults;
2739 * Initialize codec static data, called from avcodec_register().
2741 void (*init_static_data)(struct AVCodec *codec);
2743 int (*init)(AVCodecContext *);
2744 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2745 const struct AVSubtitle *sub);
2747 * Encode data to an AVPacket.
2749 * @param avctx codec context
2750 * @param avpkt output AVPacket (may contain a user-provided buffer)
2751 * @param[in] frame AVFrame containing the raw data to be encoded
2752 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2753 * non-empty packet was returned in avpkt.
2754 * @return 0 on success, negative error code on failure
2756 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2757 int *got_packet_ptr);
2758 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2759 int (*close)(AVCodecContext *);
2762 * Will be called when seeking
2764 void (*flush)(AVCodecContext *);
2770 typedef struct AVHWAccel {
2772 * Name of the hardware accelerated codec.
2773 * The name is globally unique among encoders and among decoders (but an
2774 * encoder and a decoder can share the same name).
2779 * Type of codec implemented by the hardware accelerator.
2781 * See AVMEDIA_TYPE_xxx
2783 enum AVMediaType type;
2786 * Codec implemented by the hardware accelerator.
2788 * See AV_CODEC_ID_xxx
2793 * Supported pixel format.
2795 * Only hardware accelerated formats are supported here.
2797 enum AVPixelFormat pix_fmt;
2800 * Hardware accelerated codec capabilities.
2801 * see FF_HWACCEL_CODEC_CAP_*
2805 struct AVHWAccel *next;
2808 * Called at the beginning of each frame or field picture.
2810 * Meaningful frame information (codec specific) is guaranteed to
2811 * be parsed at this point. This function is mandatory.
2813 * Note that buf can be NULL along with buf_size set to 0.
2814 * Otherwise, this means the whole frame is available at this point.
2816 * @param avctx the codec context
2817 * @param buf the frame data buffer base
2818 * @param buf_size the size of the frame in bytes
2819 * @return zero if successful, a negative value otherwise
2821 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2824 * Callback for each slice.
2826 * Meaningful slice information (codec specific) is guaranteed to
2827 * be parsed at this point. This function is mandatory.
2829 * @param avctx the codec context
2830 * @param buf the slice data buffer base
2831 * @param buf_size the size of the slice in bytes
2832 * @return zero if successful, a negative value otherwise
2834 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2837 * Called at the end of each frame or field picture.
2839 * The whole picture is parsed at this point and can now be sent
2840 * to the hardware accelerator. This function is mandatory.
2842 * @param avctx the codec context
2843 * @return zero if successful, a negative value otherwise
2845 int (*end_frame)(AVCodecContext *avctx);
2848 * Size of HW accelerator private data.
2850 * Private data is allocated with av_mallocz() before
2851 * AVCodecContext.get_buffer() and deallocated after
2852 * AVCodecContext.release_buffer().
2858 * @defgroup lavc_picture AVPicture
2860 * Functions for working with AVPicture
2865 * four components are given, that's all.
2866 * the last component is alpha
2868 typedef struct AVPicture {
2869 uint8_t *data[AV_NUM_DATA_POINTERS];
2870 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2877 #define AVPALETTE_SIZE 1024
2878 #define AVPALETTE_COUNT 256
2880 enum AVSubtitleType {
2883 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2886 * Plain text, the text field must be set by the decoder and is
2887 * authoritative. ass and pict fields may contain approximations.
2892 * Formatted text, the ass field must be set by the decoder and is
2893 * authoritative. pict and text fields may contain approximations.
2898 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
2900 typedef struct AVSubtitleRect {
2901 int x; ///< top left corner of pict, undefined when pict is not set
2902 int y; ///< top left corner of pict, undefined when pict is not set
2903 int w; ///< width of pict, undefined when pict is not set
2904 int h; ///< height of pict, undefined when pict is not set
2905 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2908 * data+linesize for the bitmap of this subtitle.
2909 * can be set for text/ass as well once they where rendered
2912 enum AVSubtitleType type;
2914 char *text; ///< 0 terminated plain UTF-8 text
2917 * 0 terminated ASS/SSA compatible event line.
2918 * The pressentation of this is unaffected by the other values in this
2925 typedef struct AVSubtitle {
2926 uint16_t format; /* 0 = graphics */
2927 uint32_t start_display_time; /* relative to packet pts, in ms */
2928 uint32_t end_display_time; /* relative to packet pts, in ms */
2930 AVSubtitleRect **rects;
2931 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2935 * If c is NULL, returns the first registered codec,
2936 * if c is non-NULL, returns the next registered codec after c,
2937 * or NULL if c is the last one.
2939 AVCodec *av_codec_next(const AVCodec *c);
2942 * Return the LIBAVCODEC_VERSION_INT constant.
2944 unsigned avcodec_version(void);
2947 * Return the libavcodec build-time configuration.
2949 const char *avcodec_configuration(void);
2952 * Return the libavcodec license.
2954 const char *avcodec_license(void);
2957 * Register the codec codec and initialize libavcodec.
2959 * @warning either this function or avcodec_register_all() must be called
2960 * before any other libavcodec functions.
2962 * @see avcodec_register_all()
2964 void avcodec_register(AVCodec *codec);
2967 * Register all the codecs, parsers and bitstream filters which were enabled at
2968 * configuration time. If you do not call this function you can select exactly
2969 * which formats you want to support, by using the individual registration
2972 * @see avcodec_register
2973 * @see av_register_codec_parser
2974 * @see av_register_bitstream_filter
2976 void avcodec_register_all(void);
2979 * Allocate an AVCodecContext and set its fields to default values. The
2980 * resulting struct can be deallocated by calling avcodec_close() on it followed
2983 * @param codec if non-NULL, allocate private data and initialize defaults
2984 * for the given codec. It is illegal to then call avcodec_open2()
2985 * with a different codec.
2986 * If NULL, then the codec-specific defaults won't be initialized,
2987 * which may result in suboptimal default settings (this is
2988 * important mainly for encoders, e.g. libx264).
2990 * @return An AVCodecContext filled with default values or NULL on failure.
2991 * @see avcodec_get_context_defaults
2993 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
2996 * Set the fields of the given AVCodecContext to default values corresponding
2997 * to the given codec (defaults may be codec-dependent).
2999 * Do not call this function if a non-NULL codec has been passed
3000 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3001 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3002 * different codec on this AVCodecContext.
3004 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3007 * Get the AVClass for AVCodecContext. It can be used in combination with
3008 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3010 * @see av_opt_find().
3012 const AVClass *avcodec_get_class(void);
3015 * Copy the settings of the source AVCodecContext into the destination
3016 * AVCodecContext. The resulting destination codec context will be
3017 * unopened, i.e. you are required to call avcodec_open2() before you
3018 * can use this AVCodecContext to decode/encode video/audio data.
3020 * @param dest target codec context, should be initialized with
3021 * avcodec_alloc_context3(), but otherwise uninitialized
3022 * @param src source codec context
3023 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3025 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3028 * Allocate an AVFrame and set its fields to default values. The resulting
3029 * struct must be freed using avcodec_free_frame().
3031 * @return An AVFrame filled with default values or NULL on failure.
3032 * @see avcodec_get_frame_defaults
3034 AVFrame *avcodec_alloc_frame(void);
3037 * Set the fields of the given AVFrame to default values.
3039 * @param frame The AVFrame of which the fields should be set to default values.
3041 void avcodec_get_frame_defaults(AVFrame *frame);
3044 * Free the frame and any dynamically allocated objects in it,
3045 * e.g. extended_data.
3047 * @param frame frame to be freed. The pointer will be set to NULL.
3049 * @warning this function does NOT free the data buffers themselves
3050 * (it does not know how, since they might have been allocated with
3051 * a custom get_buffer()).
3053 void avcodec_free_frame(AVFrame **frame);
3056 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3057 * function the context has to be allocated with avcodec_alloc_context3().
3059 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3060 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3061 * retrieving a codec.
3063 * @warning This function is not thread safe!
3066 * avcodec_register_all();
3067 * av_dict_set(&opts, "b", "2.5M", 0);
3068 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3072 * context = avcodec_alloc_context3(codec);
3074 * if (avcodec_open2(context, codec, opts) < 0)
3078 * @param avctx The context to initialize.
3079 * @param codec The codec to open this context for. If a non-NULL codec has been
3080 * previously passed to avcodec_alloc_context3() or
3081 * avcodec_get_context_defaults3() for this context, then this
3082 * parameter MUST be either NULL or equal to the previously passed
3084 * @param options A dictionary filled with AVCodecContext and codec-private options.
3085 * On return this object will be filled with options that were not found.
3087 * @return zero on success, a negative value on error
3088 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3089 * av_dict_set(), av_opt_find().
3091 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3094 * Close a given AVCodecContext and free all the data associated with it
3095 * (but not the AVCodecContext itself).
3097 * Calling this function on an AVCodecContext that hasn't been opened will free
3098 * the codec-specific data allocated in avcodec_alloc_context3() /
3099 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3102 int avcodec_close(AVCodecContext *avctx);
3105 * Free all allocated data in the given subtitle struct.
3107 * @param sub AVSubtitle to free.
3109 void avsubtitle_free(AVSubtitle *sub);
3116 * @addtogroup lavc_packet
3120 #if FF_API_DESTRUCT_PACKET
3122 * Default packet destructor.
3123 * @deprecated use the AVBuffer API instead
3125 attribute_deprecated
3126 void av_destruct_packet(AVPacket *pkt);
3130 * Initialize optional fields of a packet with default values.
3132 * Note, this does not touch the data and size members, which have to be
3133 * initialized separately.
3137 void av_init_packet(AVPacket *pkt);
3140 * Allocate the payload of a packet and initialize its fields with
3144 * @param size wanted payload size
3145 * @return 0 if OK, AVERROR_xxx otherwise
3147 int av_new_packet(AVPacket *pkt, int size);
3150 * Reduce packet size, correctly zeroing padding
3153 * @param size new size
3155 void av_shrink_packet(AVPacket *pkt, int size);
3158 * Increase packet size, correctly zeroing padding
3161 * @param grow_by number of bytes by which to increase the size of the packet
3163 int av_grow_packet(AVPacket *pkt, int grow_by);
3166 * Initialize a reference-counted packet from av_malloc()ed data.
3168 * @param pkt packet to be initialized. This function will set the data, size,
3169 * buf and destruct fields, all others are left untouched.
3170 * @param data Data allocated by av_malloc() to be used as packet data. If this
3171 * function returns successfully, the data is owned by the underlying AVBuffer.
3172 * The caller may not access the data through other means.
3173 * @param size size of data in bytes, without the padding. I.e. the full buffer
3174 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3176 * @return 0 on success, a negative AVERROR on error
3178 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3181 * @warning This is a hack - the packet memory allocation stuff is broken. The
3182 * packet is allocated if it was not really allocated.
3184 int av_dup_packet(AVPacket *pkt);
3189 * @param pkt packet to free
3191 void av_free_packet(AVPacket *pkt);
3194 * Allocate new information of a packet.
3197 * @param type side information type
3198 * @param size side information size
3199 * @return pointer to fresh allocated data or NULL otherwise
3201 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3205 * Shrink the already allocated side data buffer
3208 * @param type side information type
3209 * @param size new side information size
3210 * @return 0 on success, < 0 on failure
3212 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3216 * Get side information from packet.
3219 * @param type desired side information type
3220 * @param size pointer for side information size to store (optional)
3221 * @return pointer to data if present or NULL otherwise
3223 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3231 * @addtogroup lavc_decoding
3236 * Find a registered decoder with a matching codec ID.
3238 * @param id AVCodecID of the requested decoder
3239 * @return A decoder if one was found, NULL otherwise.
3241 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3244 * Find a registered decoder with the specified name.
3246 * @param name name of the requested decoder
3247 * @return A decoder if one was found, NULL otherwise.
3249 AVCodec *avcodec_find_decoder_by_name(const char *name);
3251 #if FF_API_GET_BUFFER
3252 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3253 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3254 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3258 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3259 * it can be called by custom get_buffer2() implementations for decoders without
3260 * CODEC_CAP_DR1 set.
3262 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3265 * Return the amount of padding in pixels which the get_buffer callback must
3266 * provide around the edge of the image for codecs which do not have the
3267 * CODEC_FLAG_EMU_EDGE flag.
3269 * @return Required padding in pixels.
3271 unsigned avcodec_get_edge_width(void);
3274 * Modify width and height values so that they will result in a memory
3275 * buffer that is acceptable for the codec if you do not use any horizontal
3278 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3279 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3280 * according to avcodec_get_edge_width() before.
3282 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3285 * Modify width and height values so that they will result in a memory
3286 * buffer that is acceptable for the codec if you also ensure that all
3287 * line sizes are a multiple of the respective linesize_align[i].
3289 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3290 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3291 * according to avcodec_get_edge_width() before.
3293 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3294 int linesize_align[AV_NUM_DATA_POINTERS]);
3297 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3299 * Some decoders may support multiple frames in a single AVPacket. Such
3300 * decoders would then just decode the first frame. In this case,
3301 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3302 * the remaining data in order to decode the second frame, etc...
3303 * Even if no frames are returned, the packet needs to be fed to the decoder
3304 * with remaining data until it is completely consumed or an error occurs.
3306 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3307 * larger than the actual read bytes because some optimized bitstream
3308 * readers read 32 or 64 bits at once and could read over the end.
3310 * @note You might have to align the input buffer. The alignment requirements
3311 * depend on the CPU and the decoder.
3313 * @param avctx the codec context
3314 * @param[out] frame The AVFrame in which to store decoded audio samples.
3315 * The decoder will allocate a buffer for the decoded frame by
3316 * calling the AVCodecContext.get_buffer2() callback.
3317 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3318 * reference counted and the returned reference belongs to the
3319 * caller. The caller must release the frame using av_frame_unref()
3320 * when the frame is no longer needed. The caller may safely write
3321 * to the frame if av_frame_is_writable() returns 1.
3322 * When AVCodecContext.refcounted_frames is set to 0, the returned
3323 * reference belongs to the decoder and is valid only until the
3324 * next call to this function or until closing the decoder.
3325 * The caller may not write to it.
3326 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3328 * @param[in] avpkt The input AVPacket containing the input buffer.
3329 * At least avpkt->data and avpkt->size should be set. Some
3330 * decoders might also require additional fields to be set.
3331 * @return A negative error code is returned if an error occurred during
3332 * decoding, otherwise the number of bytes consumed from the input
3333 * AVPacket is returned.
3335 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3336 int *got_frame_ptr, AVPacket *avpkt);
3339 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3340 * Some decoders may support multiple frames in a single AVPacket, such
3341 * decoders would then just decode the first frame.
3343 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3344 * the actual read bytes because some optimized bitstream readers read 32 or 64
3345 * bits at once and could read over the end.
3347 * @warning The end of the input buffer buf should be set to 0 to ensure that
3348 * no overreading happens for damaged MPEG streams.
3350 * @note You might have to align the input buffer avpkt->data.
3351 * The alignment requirements depend on the CPU: on some CPUs it isn't
3352 * necessary at all, on others it won't work at all if not aligned and on others
3353 * it will work but it will have an impact on performance.
3355 * In practice, avpkt->data should have 4 byte alignment at minimum.
3357 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3358 * between input and output, these need to be fed with avpkt->data=NULL,
3359 * avpkt->size=0 at the end to return the remaining frames.
3361 * @param avctx the codec context
3362 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3363 * Use av_frame_alloc() to get an AVFrame. The codec will
3364 * allocate memory for the actual bitmap by calling the
3365 * AVCodecContext.get_buffer2() callback.
3366 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3367 * reference counted and the returned reference belongs to the
3368 * caller. The caller must release the frame using av_frame_unref()
3369 * when the frame is no longer needed. The caller may safely write
3370 * to the frame if av_frame_is_writable() returns 1.
3371 * When AVCodecContext.refcounted_frames is set to 0, the returned
3372 * reference belongs to the decoder and is valid only until the
3373 * next call to this function or until closing the decoder. The
3374 * caller may not write to it.
3376 * @param[in] avpkt The input AVpacket containing the input buffer.
3377 * You can create such packet with av_init_packet() and by then setting
3378 * data and size, some decoders might in addition need other fields like
3379 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3381 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3382 * @return On error a negative value is returned, otherwise the number of bytes
3383 * used or zero if no frame could be decompressed.
3385 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3386 int *got_picture_ptr,
3390 * Decode a subtitle message.
3391 * Return a negative value on error, otherwise return the number of bytes used.
3392 * If no subtitle could be decompressed, got_sub_ptr is zero.
3393 * Otherwise, the subtitle is stored in *sub.
3394 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3395 * simplicity, because the performance difference is expect to be negligible
3396 * and reusing a get_buffer written for video codecs would probably perform badly
3397 * due to a potentially very different allocation pattern.
3399 * @param avctx the codec context
3400 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3401 freed with avsubtitle_free if *got_sub_ptr is set.
3402 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3403 * @param[in] avpkt The input AVPacket containing the input buffer.
3405 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3410 * @defgroup lavc_parsing Frame parsing
3414 enum AVPictureStructure {
3415 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3416 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3417 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3418 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3421 typedef struct AVCodecParserContext {
3423 struct AVCodecParser *parser;
3424 int64_t frame_offset; /* offset of the current frame */
3425 int64_t cur_offset; /* current offset
3426 (incremented by each av_parser_parse()) */
3427 int64_t next_frame_offset; /* offset of the next frame */
3429 int pict_type; /* XXX: Put it back in AVCodecContext. */
3431 * This field is used for proper frame duration computation in lavf.
3432 * It signals, how much longer the frame duration of the current frame
3433 * is compared to normal frame duration.
3435 * frame_duration = (1 + repeat_pict) * time_base
3437 * It is used by codecs like H.264 to display telecined material.
3439 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3440 int64_t pts; /* pts of the current frame */
3441 int64_t dts; /* dts of the current frame */
3446 int fetch_timestamp;
3448 #define AV_PARSER_PTS_NB 4
3449 int cur_frame_start_index;
3450 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3451 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3452 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3455 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3456 #define PARSER_FLAG_ONCE 0x0002
3457 /// Set if the parser has a valid file offset
3458 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3460 int64_t offset; ///< byte offset from starting packet start
3461 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3464 * Set by parser to 1 for key frames and 0 for non-key frames.
3465 * It is initialized to -1, so if the parser doesn't set this flag,
3466 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3472 * Time difference in stream time base units from the pts of this
3473 * packet to the point at which the output from the decoder has converged
3474 * independent from the availability of previous frames. That is, the
3475 * frames are virtually identical no matter if decoding started from
3476 * the very first frame or from this keyframe.
3477 * Is AV_NOPTS_VALUE if unknown.
3478 * This field is not the display duration of the current frame.
3479 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3482 * The purpose of this field is to allow seeking in streams that have no
3483 * keyframes in the conventional sense. It corresponds to the
3484 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3485 * essential for some types of subtitle streams to ensure that all
3486 * subtitles are correctly displayed after seeking.
3488 int64_t convergence_duration;
3490 // Timestamp generation support:
3492 * Synchronization point for start of timestamp generation.
3494 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3497 * For example, this corresponds to presence of H.264 buffering period
3503 * Offset of the current timestamp against last timestamp sync point in
3504 * units of AVCodecContext.time_base.
3506 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3507 * contain a valid timestamp offset.
3509 * Note that the timestamp of sync point has usually a nonzero
3510 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3511 * the next frame after timestamp sync point will be usually 1.
3513 * For example, this corresponds to H.264 cpb_removal_delay.
3515 int dts_ref_dts_delta;
3518 * Presentation delay of current frame in units of AVCodecContext.time_base.
3520 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3521 * contain valid non-negative timestamp delta (presentation time of a frame
3522 * must not lie in the past).
3524 * This delay represents the difference between decoding and presentation
3525 * time of the frame.
3527 * For example, this corresponds to H.264 dpb_output_delay.
3532 * Position of the packet in file.
3534 * Analogous to cur_frame_pts/dts
3536 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3539 * Byte position of currently parsed frame in stream.
3544 * Previous frame byte position.
3549 * Duration of the current frame.
3550 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3551 * For all other types, this is in units of AVCodecContext.time_base.
3555 enum AVFieldOrder field_order;
3558 * Indicate whether a picture is coded as a frame, top field or bottom field.
3560 * For example, H.264 field_pic_flag equal to 0 corresponds to
3561 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3562 * equal to 1 and bottom_field_flag equal to 0 corresponds to
3563 * AV_PICTURE_STRUCTURE_TOP_FIELD.
3565 enum AVPictureStructure picture_structure;
3566 } AVCodecParserContext;
3568 typedef struct AVCodecParser {
3569 int codec_ids[5]; /* several codec IDs are permitted */
3571 int (*parser_init)(AVCodecParserContext *s);
3572 int (*parser_parse)(AVCodecParserContext *s,
3573 AVCodecContext *avctx,
3574 const uint8_t **poutbuf, int *poutbuf_size,
3575 const uint8_t *buf, int buf_size);
3576 void (*parser_close)(AVCodecParserContext *s);
3577 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3578 struct AVCodecParser *next;
3581 AVCodecParser *av_parser_next(AVCodecParser *c);
3583 void av_register_codec_parser(AVCodecParser *parser);
3584 AVCodecParserContext *av_parser_init(int codec_id);
3589 * @param s parser context.
3590 * @param avctx codec context.
3591 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3592 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3593 * @param buf input buffer.
3594 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3595 * @param pts input presentation timestamp.
3596 * @param dts input decoding timestamp.
3597 * @param pos input byte position in stream.
3598 * @return the number of bytes of the input bitstream used.
3603 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3610 * decode_frame(data, size);
3614 int av_parser_parse2(AVCodecParserContext *s,
3615 AVCodecContext *avctx,
3616 uint8_t **poutbuf, int *poutbuf_size,
3617 const uint8_t *buf, int buf_size,
3618 int64_t pts, int64_t dts,
3622 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3623 * @deprecated use AVBitstreamFilter
3625 int av_parser_change(AVCodecParserContext *s,
3626 AVCodecContext *avctx,
3627 uint8_t **poutbuf, int *poutbuf_size,
3628 const uint8_t *buf, int buf_size, int keyframe);
3629 void av_parser_close(AVCodecParserContext *s);
3637 * @addtogroup lavc_encoding
3642 * Find a registered encoder with a matching codec ID.
3644 * @param id AVCodecID of the requested encoder
3645 * @return An encoder if one was found, NULL otherwise.
3647 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3650 * Find a registered encoder with the specified name.
3652 * @param name name of the requested encoder
3653 * @return An encoder if one was found, NULL otherwise.
3655 AVCodec *avcodec_find_encoder_by_name(const char *name);
3658 * Encode a frame of audio.
3660 * Takes input samples from frame and writes the next output packet, if
3661 * available, to avpkt. The output packet does not necessarily contain data for
3662 * the most recent frame, as encoders can delay, split, and combine input frames
3663 * internally as needed.
3665 * @param avctx codec context
3666 * @param avpkt output AVPacket.
3667 * The user can supply an output buffer by setting
3668 * avpkt->data and avpkt->size prior to calling the
3669 * function, but if the size of the user-provided data is not
3670 * large enough, encoding will fail. All other AVPacket fields
3671 * will be reset by the encoder using av_init_packet(). If
3672 * avpkt->data is NULL, the encoder will allocate it.
3673 * The encoder will set avpkt->size to the size of the
3676 * If this function fails or produces no output, avpkt will be
3677 * freed using av_free_packet() (i.e. avpkt->destruct will be
3678 * called to free the user supplied buffer).
3679 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3680 * May be NULL when flushing an encoder that has the
3681 * CODEC_CAP_DELAY capability set.
3682 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3683 * can have any number of samples.
3684 * If it is not set, frame->nb_samples must be equal to
3685 * avctx->frame_size for all frames except the last.
3686 * The final frame may be smaller than avctx->frame_size.
3687 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3688 * output packet is non-empty, and to 0 if it is
3689 * empty. If the function returns an error, the
3690 * packet can be assumed to be invalid, and the
3691 * value of got_packet_ptr is undefined and should
3693 * @return 0 on success, negative error code on failure
3695 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3696 const AVFrame *frame, int *got_packet_ptr);
3699 * Encode a frame of video.
3701 * Takes input raw video data from frame and writes the next output packet, if
3702 * available, to avpkt. The output packet does not necessarily contain data for
3703 * the most recent frame, as encoders can delay and reorder input frames
3704 * internally as needed.
3706 * @param avctx codec context
3707 * @param avpkt output AVPacket.
3708 * The user can supply an output buffer by setting
3709 * avpkt->data and avpkt->size prior to calling the
3710 * function, but if the size of the user-provided data is not
3711 * large enough, encoding will fail. All other AVPacket fields
3712 * will be reset by the encoder using av_init_packet(). If
3713 * avpkt->data is NULL, the encoder will allocate it.
3714 * The encoder will set avpkt->size to the size of the
3715 * output packet. The returned data (if any) belongs to the
3716 * caller, he is responsible for freeing it.
3718 * If this function fails or produces no output, avpkt will be
3719 * freed using av_free_packet() (i.e. avpkt->destruct will be
3720 * called to free the user supplied buffer).
3721 * @param[in] frame AVFrame containing the raw video data to be encoded.
3722 * May be NULL when flushing an encoder that has the
3723 * CODEC_CAP_DELAY capability set.
3724 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3725 * output packet is non-empty, and to 0 if it is
3726 * empty. If the function returns an error, the
3727 * packet can be assumed to be invalid, and the
3728 * value of got_packet_ptr is undefined and should
3730 * @return 0 on success, negative error code on failure
3732 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3733 const AVFrame *frame, int *got_packet_ptr);
3735 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3736 const AVSubtitle *sub);
3744 * @addtogroup lavc_picture
3749 * Allocate memory for a picture. Call avpicture_free() to free it.
3751 * @see avpicture_fill()
3753 * @param picture the picture to be filled in
3754 * @param pix_fmt the format of the picture
3755 * @param width the width of the picture
3756 * @param height the height of the picture
3757 * @return zero if successful, a negative value if not
3759 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
3762 * Free a picture previously allocated by avpicture_alloc().
3763 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3766 * @param picture the AVPicture to be freed
3768 void avpicture_free(AVPicture *picture);
3771 * Fill in the AVPicture fields.
3772 * The fields of the given AVPicture are filled in by using the 'ptr' address
3773 * which points to the image data buffer. Depending on the specified picture
3774 * format, one or multiple image data pointers and line sizes will be set.
3775 * If a planar format is specified, several pointers will be set pointing to
3776 * the different picture planes and the line sizes of the different planes
3777 * will be stored in the lines_sizes array.
3778 * Call with ptr == NULL to get the required size for the ptr buffer.
3780 * To allocate the buffer and fill in the AVPicture fields in one call,
3781 * use avpicture_alloc().
3783 * @param picture AVPicture whose fields are to be filled in
3784 * @param ptr Buffer which will contain or contains the actual image data
3785 * @param pix_fmt The format in which the picture data is stored.
3786 * @param width the width of the image in pixels
3787 * @param height the height of the image in pixels
3788 * @return size of the image data in bytes
3790 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3791 enum AVPixelFormat pix_fmt, int width, int height);
3794 * Copy pixel data from an AVPicture into a buffer.
3795 * The data is stored compactly, without any gaps for alignment or padding
3796 * which may be applied by avpicture_fill().
3798 * @see avpicture_get_size()
3800 * @param[in] src AVPicture containing image data
3801 * @param[in] pix_fmt The format in which the picture data is stored.
3802 * @param[in] width the width of the image in pixels.
3803 * @param[in] height the height of the image in pixels.
3804 * @param[out] dest A buffer into which picture data will be copied.
3805 * @param[in] dest_size The size of 'dest'.
3806 * @return The number of bytes written to dest, or a negative value (error code) on error.
3808 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
3809 int width, int height,
3810 unsigned char *dest, int dest_size);
3813 * Calculate the size in bytes that a picture of the given width and height
3814 * would occupy if stored in the given picture format.
3815 * Note that this returns the size of a compact representation as generated
3816 * by avpicture_layout(), which can be smaller than the size required for e.g.
3819 * @param pix_fmt the given picture format
3820 * @param width the width of the image
3821 * @param height the height of the image
3822 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3824 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
3826 #if FF_API_DEINTERLACE
3828 * deinterlace - if not supported return -1
3830 * @deprecated - use yadif (in libavfilter) instead
3832 attribute_deprecated
3833 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3834 enum AVPixelFormat pix_fmt, int width, int height);
3837 * Copy image src to dst. Wraps av_picture_data_copy() above.
3839 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3840 enum AVPixelFormat pix_fmt, int width, int height);
3843 * Crop image top and left side.
3845 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3846 enum AVPixelFormat pix_fmt, int top_band, int left_band);
3851 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
3852 int padtop, int padbottom, int padleft, int padright, int *color);
3859 * @defgroup lavc_misc Utility functions
3862 * Miscellaneous utility functions related to both encoding and decoding
3868 * @defgroup lavc_misc_pixfmt Pixel formats
3870 * Functions for working with pixel formats.
3875 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
3878 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
3881 * Return a value representing the fourCC code associated to the
3882 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3885 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
3887 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3888 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3889 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3890 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3891 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3892 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3895 * Compute what kind of losses will occur when converting from one specific
3896 * pixel format to another.
3897 * When converting from one pixel format to another, information loss may occur.
3898 * For example, when converting from RGB24 to GRAY, the color information will
3899 * be lost. Similarly, other losses occur when converting from some formats to
3900 * other formats. These losses can involve loss of chroma, but also loss of
3901 * resolution, loss of color depth, loss due to the color space conversion, loss
3902 * of the alpha bits or loss due to color quantization.
3903 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3904 * which will occur when converting from one pixel format to another.
3906 * @param[in] dst_pix_fmt destination pixel format
3907 * @param[in] src_pix_fmt source pixel format
3908 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3909 * @return Combination of flags informing you what kind of losses will occur.
3911 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
3915 * Find the best pixel format to convert to given a certain source pixel
3916 * format. When converting from one pixel format to another, information loss
3917 * may occur. For example, when converting from RGB24 to GRAY, the color
3918 * information will be lost. Similarly, other losses occur when converting from
3919 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
3920 * the given pixel formats should be used to suffer the least amount of loss.
3921 * The pixel formats from which it chooses one, are determined by the
3922 * pix_fmt_list parameter.
3925 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
3926 * @param[in] src_pix_fmt source pixel format
3927 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3928 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3929 * @return The best pixel format to convert to or -1 if none was found.
3931 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
3932 enum AVPixelFormat src_pix_fmt,
3933 int has_alpha, int *loss_ptr);
3935 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
3941 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3944 * Put a string representing the codec tag codec_tag in buf.
3946 * @param buf_size size in bytes of buf
3947 * @return the length of the string that would have been generated if
3948 * enough space had been available, excluding the trailing null
3950 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3952 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3955 * Return a name for the specified profile, if available.
3957 * @param codec the codec that is searched for the given profile
3958 * @param profile the profile value for which a name is requested
3959 * @return A name for the profile if found, NULL otherwise.
3961 const char *av_get_profile_name(const AVCodec *codec, int profile);
3963 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3964 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3965 //FIXME func typedef
3968 * Fill audio frame data and linesize.
3969 * AVFrame extended_data channel pointers are allocated if necessary for
3972 * @param frame the AVFrame
3973 * frame->nb_samples must be set prior to calling the
3974 * function. This function fills in frame->data,
3975 * frame->extended_data, frame->linesize[0].
3976 * @param nb_channels channel count
3977 * @param sample_fmt sample format
3978 * @param buf buffer to use for frame data
3979 * @param buf_size size of buffer
3980 * @param align plane size sample alignment (0 = default)
3981 * @return 0 on success, negative error code on failure
3983 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
3984 enum AVSampleFormat sample_fmt, const uint8_t *buf,
3985 int buf_size, int align);
3988 * Flush buffers, should be called when seeking or when switching to a different stream.
3990 void avcodec_flush_buffers(AVCodecContext *avctx);
3993 * Return codec bits per sample.
3995 * @param[in] codec_id the codec
3996 * @return Number of bits per sample or zero if unknown for the given codec.
3998 int av_get_bits_per_sample(enum AVCodecID codec_id);
4001 * Return codec bits per sample.
4002 * Only return non-zero if the bits per sample is exactly correct, not an
4005 * @param[in] codec_id the codec
4006 * @return Number of bits per sample or zero if unknown for the given codec.
4008 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4011 * Return audio frame duration.
4013 * @param avctx codec context
4014 * @param frame_bytes size of the frame, or 0 if unknown
4015 * @return frame duration, in samples, if known. 0 if not able to
4018 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4021 typedef struct AVBitStreamFilterContext {
4023 struct AVBitStreamFilter *filter;
4024 AVCodecParserContext *parser;
4025 struct AVBitStreamFilterContext *next;
4026 } AVBitStreamFilterContext;
4029 typedef struct AVBitStreamFilter {
4032 int (*filter)(AVBitStreamFilterContext *bsfc,
4033 AVCodecContext *avctx, const char *args,
4034 uint8_t **poutbuf, int *poutbuf_size,
4035 const uint8_t *buf, int buf_size, int keyframe);
4036 void (*close)(AVBitStreamFilterContext *bsfc);
4037 struct AVBitStreamFilter *next;
4038 } AVBitStreamFilter;
4040 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4041 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4042 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4043 AVCodecContext *avctx, const char *args,
4044 uint8_t **poutbuf, int *poutbuf_size,
4045 const uint8_t *buf, int buf_size, int keyframe);
4046 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4048 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4053 * Reallocate the given block if it is not large enough, otherwise do nothing.
4057 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4060 * Allocate a buffer, reusing the given one if large enough.
4062 * Contrary to av_fast_realloc the current buffer contents might not be
4063 * preserved and on error the old buffer is freed, thus no special
4064 * handling to avoid memleaks is necessary.
4066 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4067 * @param size size of the buffer *ptr points to
4068 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4069 * *size 0 if an error occurred.
4071 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4074 * Allocate a buffer with padding, reusing the given one if large enough.
4076 * Same behaviour av_fast_malloc but the buffer has additional
4077 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4080 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4083 * Encode extradata length to a buffer. Used by xiph codecs.
4085 * @param s buffer to write to; must be at least (v/255+1) bytes long
4086 * @param v size of extradata in bytes
4087 * @return number of bytes written to the buffer.
4089 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4091 #if FF_API_MISSING_SAMPLE
4093 * Log a generic warning message about a missing feature. This function is
4094 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4095 * only, and would normally not be used by applications.
4096 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4097 * a pointer to an AVClass struct
4098 * @param[in] feature string containing the name of the missing feature
4099 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4100 * If want_sample is non-zero, additional verbage will be added to the log
4101 * message which tells the user how to report samples to the development
4103 * @deprecated Use avpriv_report_missing_feature() instead.
4105 attribute_deprecated
4106 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4109 * Log a generic warning message asking for a sample. This function is
4110 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4111 * only, and would normally not be used by applications.
4112 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4113 * a pointer to an AVClass struct
4114 * @param[in] msg string containing an optional message, or NULL if no message
4115 * @deprecated Use avpriv_request_sample() instead.
4117 attribute_deprecated
4118 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4119 #endif /* FF_API_MISSING_SAMPLE */
4122 * Register the hardware accelerator hwaccel.
4124 void av_register_hwaccel(AVHWAccel *hwaccel);
4127 * If hwaccel is NULL, returns the first registered hardware accelerator,
4128 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4129 * after hwaccel, or NULL if hwaccel is the last one.
4131 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4135 * Lock operation used by lockmgr
4138 AV_LOCK_CREATE, ///< Create a mutex
4139 AV_LOCK_OBTAIN, ///< Lock the mutex
4140 AV_LOCK_RELEASE, ///< Unlock the mutex
4141 AV_LOCK_DESTROY, ///< Free mutex resources
4145 * Register a user provided lock manager supporting the operations
4146 * specified by AVLockOp. mutex points to a (void *) where the
4147 * lockmgr should store/get a pointer to a user allocated mutex. It's
4148 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4150 * @param cb User defined callback. Note: Libav may invoke calls to this
4151 * callback during the call to av_lockmgr_register().
4152 * Thus, the application must be prepared to handle that.
4153 * If cb is set to NULL the lockmgr will be unregistered.
4154 * Also note that during unregistration the previously registered
4155 * lockmgr callback may also be invoked.
4157 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4160 * Get the type of the given codec.
4162 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4165 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4166 * with no corresponding avcodec_close()), 0 otherwise.
4168 int avcodec_is_open(AVCodecContext *s);
4171 * @return a non-zero number if codec is an encoder, zero otherwise
4173 int av_codec_is_encoder(const AVCodec *codec);
4176 * @return a non-zero number if codec is a decoder, zero otherwise
4178 int av_codec_is_decoder(const AVCodec *codec);
4181 * @return descriptor for given codec ID or NULL if no descriptor exists.
4183 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4186 * Iterate over all codec descriptors known to libavcodec.
4188 * @param prev previous descriptor. NULL to get the first descriptor.
4190 * @return next descriptor or NULL after the last descriptor
4192 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4195 * @return codec descriptor with the given name or NULL if no such descriptor
4198 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4204 #endif /* AVCODEC_AVCODEC_H */