2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
30 #include "libavutil/samplefmt.h"
31 #include "libavutil/avutil.h"
32 #include "libavutil/buffer.h"
33 #include "libavutil/cpu.h"
34 #include "libavutil/dict.h"
35 #include "libavutil/frame.h"
36 #include "libavutil/log.h"
37 #include "libavutil/pixfmt.h"
38 #include "libavutil/rational.h"
40 #include "libavcodec/version.h"
42 * @defgroup libavc Encoding/Decoding Library
45 * @defgroup lavc_decoding Decoding
49 * @defgroup lavc_encoding Encoding
53 * @defgroup lavc_codec Codecs
55 * @defgroup lavc_codec_native Native Codecs
58 * @defgroup lavc_codec_wrappers External library wrappers
61 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
65 * @defgroup lavc_internal Internal
73 * @defgroup lavc_core Core functions/structures.
76 * Basic definitions, functions for querying libavcodec capabilities,
77 * allocating core structures, etc.
83 * Identify the syntax and semantics of the bitstream.
84 * The principle is roughly:
85 * Two decoders with the same ID can decode the same streams.
86 * Two encoders with the same ID can encode compatible streams.
87 * There may be slight deviations from the principle due to implementation
90 * If you add a codec ID to this list, add it so that
91 * 1. no value of a existing codec ID changes (that would break ABI),
92 * 2. it is as close as possible to similar codecs.
94 * After adding new codec IDs, do not forget to add an entry to the codec
95 * descriptor list and bump libavcodec minor version.
101 AV_CODEC_ID_MPEG1VIDEO,
102 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
103 AV_CODEC_ID_MPEG2VIDEO_XVMC,
114 AV_CODEC_ID_RAWVIDEO,
115 AV_CODEC_ID_MSMPEG4V1,
116 AV_CODEC_ID_MSMPEG4V2,
117 AV_CODEC_ID_MSMPEG4V3,
140 AV_CODEC_ID_INTERPLAY_VIDEO,
147 AV_CODEC_ID_MSVIDEO1,
152 AV_CODEC_ID_TRUEMOTION1,
153 AV_CODEC_ID_VMDVIDEO,
178 AV_CODEC_ID_TRUEMOTION2,
184 AV_CODEC_ID_SMACKVIDEO,
189 AV_CODEC_ID_JPEG2000,
195 AV_CODEC_ID_DSICINVIDEO,
196 AV_CODEC_ID_TIERTEXSEQVIDEO,
204 AV_CODEC_ID_BETHSOFTVID,
216 AV_CODEC_ID_ESCAPE124,
220 AV_CODEC_ID_MOTIONPIXELS,
232 AV_CODEC_ID_FLASHSV2,
233 AV_CODEC_ID_CDGRAPHICS,
236 AV_CODEC_ID_BINKVIDEO,
237 AV_CODEC_ID_IFF_ILBM,
238 AV_CODEC_ID_IFF_BYTERUN1,
244 AV_CODEC_ID_A64_MULTI,
245 AV_CODEC_ID_A64_MULTI5,
248 AV_CODEC_ID_LAGARITH,
252 AV_CODEC_ID_WMV3IMAGE,
253 AV_CODEC_ID_VC1IMAGE,
255 AV_CODEC_ID_BMV_VIDEO,
262 AV_CODEC_ID_ZEROCODEC,
271 /* various PCM "codecs" */
272 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
273 AV_CODEC_ID_PCM_S16LE = 0x10000,
274 AV_CODEC_ID_PCM_S16BE,
275 AV_CODEC_ID_PCM_U16LE,
276 AV_CODEC_ID_PCM_U16BE,
279 AV_CODEC_ID_PCM_MULAW,
280 AV_CODEC_ID_PCM_ALAW,
281 AV_CODEC_ID_PCM_S32LE,
282 AV_CODEC_ID_PCM_S32BE,
283 AV_CODEC_ID_PCM_U32LE,
284 AV_CODEC_ID_PCM_U32BE,
285 AV_CODEC_ID_PCM_S24LE,
286 AV_CODEC_ID_PCM_S24BE,
287 AV_CODEC_ID_PCM_U24LE,
288 AV_CODEC_ID_PCM_U24BE,
289 AV_CODEC_ID_PCM_S24DAUD,
290 AV_CODEC_ID_PCM_ZORK,
291 AV_CODEC_ID_PCM_S16LE_PLANAR,
293 AV_CODEC_ID_PCM_F32BE,
294 AV_CODEC_ID_PCM_F32LE,
295 AV_CODEC_ID_PCM_F64BE,
296 AV_CODEC_ID_PCM_F64LE,
297 AV_CODEC_ID_PCM_BLURAY,
300 AV_CODEC_ID_PCM_S8_PLANAR,
302 /* various ADPCM codecs */
303 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
304 AV_CODEC_ID_ADPCM_IMA_WAV,
305 AV_CODEC_ID_ADPCM_IMA_DK3,
306 AV_CODEC_ID_ADPCM_IMA_DK4,
307 AV_CODEC_ID_ADPCM_IMA_WS,
308 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
309 AV_CODEC_ID_ADPCM_MS,
310 AV_CODEC_ID_ADPCM_4XM,
311 AV_CODEC_ID_ADPCM_XA,
312 AV_CODEC_ID_ADPCM_ADX,
313 AV_CODEC_ID_ADPCM_EA,
314 AV_CODEC_ID_ADPCM_G726,
315 AV_CODEC_ID_ADPCM_CT,
316 AV_CODEC_ID_ADPCM_SWF,
317 AV_CODEC_ID_ADPCM_YAMAHA,
318 AV_CODEC_ID_ADPCM_SBPRO_4,
319 AV_CODEC_ID_ADPCM_SBPRO_3,
320 AV_CODEC_ID_ADPCM_SBPRO_2,
321 AV_CODEC_ID_ADPCM_THP,
322 AV_CODEC_ID_ADPCM_IMA_AMV,
323 AV_CODEC_ID_ADPCM_EA_R1,
324 AV_CODEC_ID_ADPCM_EA_R3,
325 AV_CODEC_ID_ADPCM_EA_R2,
326 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
327 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
328 AV_CODEC_ID_ADPCM_EA_XAS,
329 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
330 AV_CODEC_ID_ADPCM_IMA_ISS,
331 AV_CODEC_ID_ADPCM_G722,
332 AV_CODEC_ID_ADPCM_IMA_APC,
335 AV_CODEC_ID_AMR_NB = 0x12000,
338 /* RealAudio codecs*/
339 AV_CODEC_ID_RA_144 = 0x13000,
342 /* various DPCM codecs */
343 AV_CODEC_ID_ROQ_DPCM = 0x14000,
344 AV_CODEC_ID_INTERPLAY_DPCM,
345 AV_CODEC_ID_XAN_DPCM,
346 AV_CODEC_ID_SOL_DPCM,
349 AV_CODEC_ID_MP2 = 0x15000,
350 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
360 AV_CODEC_ID_VMDAUDIO,
366 AV_CODEC_ID_WESTWOOD_SND1,
367 AV_CODEC_ID_GSM, ///< as in Berlin toast format
370 AV_CODEC_ID_TRUESPEECH,
372 AV_CODEC_ID_SMACKAUDIO,
375 AV_CODEC_ID_DSICINAUDIO,
377 AV_CODEC_ID_MUSEPACK7,
379 AV_CODEC_ID_GSM_MS, /* as found in WAV */
383 AV_CODEC_ID_NELLYMOSER,
384 AV_CODEC_ID_MUSEPACK8,
386 AV_CODEC_ID_WMAVOICE,
388 AV_CODEC_ID_WMALOSSLESS,
397 AV_CODEC_ID_BINKAUDIO_RDFT,
398 AV_CODEC_ID_BINKAUDIO_DCT,
399 AV_CODEC_ID_AAC_LATM,
404 AV_CODEC_ID_8SVX_EXP,
405 AV_CODEC_ID_8SVX_FIB,
406 AV_CODEC_ID_BMV_AUDIO,
411 AV_CODEC_ID_COMFORT_NOISE,
414 /* subtitle codecs */
415 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
416 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
417 AV_CODEC_ID_DVB_SUBTITLE,
418 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
421 AV_CODEC_ID_MOV_TEXT,
422 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
423 AV_CODEC_ID_DVB_TELETEXT,
426 /* other specific kind of codecs (generally used for attachments) */
427 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
428 AV_CODEC_ID_TTF = 0x18000,
430 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
432 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
433 * stream (only used by libavformat) */
434 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
435 * stream (only used by libavformat) */
436 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
440 * This struct describes the properties of a single codec described by an
442 * @see avcodec_get_descriptor()
444 typedef struct AVCodecDescriptor {
446 enum AVMediaType type;
448 * Name of the codec described by this descriptor. It is non-empty and
449 * unique for each codec descriptor. It should contain alphanumeric
450 * characters and '_' only.
454 * A more descriptive name for this codec. May be NULL.
456 const char *long_name;
458 * Codec properties, a combination of AV_CODEC_PROP_* flags.
464 * Codec uses only intra compression.
467 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
469 * Codec supports lossy compression. Audio and video codecs only.
470 * @note a codec may support both lossy and lossless
473 #define AV_CODEC_PROP_LOSSY (1 << 1)
475 * Codec supports lossless compression. Audio and video codecs only.
477 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
480 * @ingroup lavc_decoding
481 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
482 * This is mainly needed because some optimized bitstream readers read
483 * 32 or 64 bit at once and could read over the end.<br>
484 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
485 * MPEG bitstreams could cause overread and segfault.
487 #define FF_INPUT_BUFFER_PADDING_SIZE 8
490 * @ingroup lavc_encoding
491 * minimum encoding buffer size
492 * Used to avoid some checks during header writing.
494 #define FF_MIN_BUFFER_SIZE 16384
498 * @ingroup lavc_encoding
499 * motion estimation type.
502 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
506 ME_EPZS, ///< enhanced predictive zonal search
507 ME_X1, ///< reserved for experiments
508 ME_HEX, ///< hexagon based search
509 ME_UMH, ///< uneven multi-hexagon search
510 ME_TESA, ///< transformed exhaustive search algorithm
514 * @ingroup lavc_decoding
517 /* We leave some space between them for extensions (drop some
518 * keyframes for intra-only or drop just some bidir frames). */
519 AVDISCARD_NONE =-16, ///< discard nothing
520 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
521 AVDISCARD_NONREF = 8, ///< discard all non reference
522 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
523 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
524 AVDISCARD_ALL = 48, ///< discard all
527 enum AVColorPrimaries{
528 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
529 AVCOL_PRI_UNSPECIFIED = 2,
530 AVCOL_PRI_BT470M = 4,
531 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
532 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
533 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
535 AVCOL_PRI_NB , ///< Not part of ABI
538 enum AVColorTransferCharacteristic{
539 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
540 AVCOL_TRC_UNSPECIFIED = 2,
541 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
542 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
543 AVCOL_TRC_SMPTE240M = 7,
544 AVCOL_TRC_NB , ///< Not part of ABI
549 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
550 AVCOL_SPC_UNSPECIFIED = 2,
552 AVCOL_SPC_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM / IEC 61966-2-4 xvYCC601
553 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
554 AVCOL_SPC_SMPTE240M = 7,
555 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
556 AVCOL_SPC_NB , ///< Not part of ABI
560 AVCOL_RANGE_UNSPECIFIED = 0,
561 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
562 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
563 AVCOL_RANGE_NB , ///< Not part of ABI
567 * X X 3 4 X X are luma samples,
568 * 1 2 1-6 are possible chroma positions
569 * X X 5 6 X 0 is undefined/unknown position
571 enum AVChromaLocation{
572 AVCHROMA_LOC_UNSPECIFIED = 0,
573 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
574 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
575 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
576 AVCHROMA_LOC_TOP = 4,
577 AVCHROMA_LOC_BOTTOMLEFT = 5,
578 AVCHROMA_LOC_BOTTOM = 6,
579 AVCHROMA_LOC_NB , ///< Not part of ABI
582 enum AVAudioServiceType {
583 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
584 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
585 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
586 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
587 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
588 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
589 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
590 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
591 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
592 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
596 * @ingroup lavc_encoding
598 typedef struct RcOverride{
601 int qscale; // If this is 0 then quality_factor will be used instead.
602 float quality_factor;
605 #define FF_MAX_B_FRAMES 16
608 These flags can be passed in AVCodecContext.flags before initialization.
609 Note: Not everything is supported yet.
613 * Allow decoders to produce frames with data planes that are not aligned
614 * to CPU requirements (e.g. due to cropping).
616 #define CODEC_FLAG_UNALIGNED 0x0001
617 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
618 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
619 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
620 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
621 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
623 * The parent program guarantees that the input for B-frames containing
624 * streams is not written to for at least s->max_b_frames+1 frames, if
625 * this is not set the input will be copied.
627 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
628 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
629 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
630 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
631 #define CODEC_FLAG_EMU_EDGE 0x4000 ///< Don't draw edges.
632 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
633 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
634 location instead of only at frame boundaries. */
635 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
636 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
637 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
638 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
639 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
640 /* Fx : Flag for h263+ extra options */
641 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
642 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
643 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
644 #define CODEC_FLAG_CLOSED_GOP 0x80000000
645 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
646 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
647 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
648 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
650 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
652 /* Unsupported options :
653 * Syntax Arithmetic coding (SAC)
654 * Reference Picture Selection
655 * Independent Segment Decoding */
657 /* codec capabilities */
659 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
661 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
662 * If not set, it might not use get_buffer() at all or use operations that
663 * assume the buffer was allocated by avcodec_default_get_buffer.
665 #define CODEC_CAP_DR1 0x0002
666 #define CODEC_CAP_TRUNCATED 0x0008
667 /* Codec can export data for HW decoding (XvMC). */
668 #define CODEC_CAP_HWACCEL 0x0010
670 * Encoder or decoder requires flushing with NULL input at the end in order to
671 * give the complete and correct output.
673 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
674 * with NULL data. The user can still send NULL data to the public encode
675 * or decode function, but libavcodec will not pass it along to the codec
676 * unless this flag is set.
679 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
680 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
684 * The encoder needs to be fed with NULL data at the end of encoding until the
685 * encoder no longer returns data.
687 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
688 * flag also means that the encoder must set the pts and duration for
689 * each output packet. If this flag is not set, the pts and duration will
690 * be determined by libavcodec from the input frame.
692 #define CODEC_CAP_DELAY 0x0020
694 * Codec can be fed a final frame with a smaller size.
695 * This can be used to prevent truncation of the last audio samples.
697 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
699 * Codec can export data for HW decoding (VDPAU).
701 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
703 * Codec can output multiple frames per AVPacket
704 * Normally demuxers return one frame at a time, demuxers which do not do
705 * are connected to a parser to split what they return into proper frames.
706 * This flag is reserved to the very rare category of codecs which have a
707 * bitstream that cannot be split into frames without timeconsuming
708 * operations like full decoding. Demuxers carring such bitstreams thus
709 * may return multiple frames in a packet. This has many disadvantages like
710 * prohibiting stream copy in many cases thus it should only be considered
713 #define CODEC_CAP_SUBFRAMES 0x0100
715 * Codec is experimental and is thus avoided in favor of non experimental
718 #define CODEC_CAP_EXPERIMENTAL 0x0200
720 * Codec should fill in channel configuration and samplerate instead of container
722 #define CODEC_CAP_CHANNEL_CONF 0x0400
724 * Codec is able to deal with negative linesizes
726 #define CODEC_CAP_NEG_LINESIZES 0x0800
728 * Codec supports frame-level multithreading.
730 #define CODEC_CAP_FRAME_THREADS 0x1000
732 * Codec supports slice-based (or partition-based) multithreading.
734 #define CODEC_CAP_SLICE_THREADS 0x2000
736 * Codec supports changed parameters at any point.
738 #define CODEC_CAP_PARAM_CHANGE 0x4000
740 * Codec supports avctx->thread_count == 0 (auto).
742 #define CODEC_CAP_AUTO_THREADS 0x8000
744 * Audio encoder supports receiving a different number of samples in each call.
746 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
748 //The following defines may change, don't expect compatibility if you use them.
749 #define MB_TYPE_INTRA4x4 0x0001
750 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
751 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
752 #define MB_TYPE_16x16 0x0008
753 #define MB_TYPE_16x8 0x0010
754 #define MB_TYPE_8x16 0x0020
755 #define MB_TYPE_8x8 0x0040
756 #define MB_TYPE_INTERLACED 0x0080
757 #define MB_TYPE_DIRECT2 0x0100 //FIXME
758 #define MB_TYPE_ACPRED 0x0200
759 #define MB_TYPE_GMC 0x0400
760 #define MB_TYPE_SKIP 0x0800
761 #define MB_TYPE_P0L0 0x1000
762 #define MB_TYPE_P1L0 0x2000
763 #define MB_TYPE_P0L1 0x4000
764 #define MB_TYPE_P1L1 0x8000
765 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
766 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
767 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
768 #define MB_TYPE_QUANT 0x00010000
769 #define MB_TYPE_CBP 0x00020000
770 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
774 * This specifies the area which should be displayed.
775 * Note there may be multiple such areas for one frame.
777 typedef struct AVPanScan{
780 * - encoding: Set by user.
781 * - decoding: Set by libavcodec.
786 * width and height in 1/16 pel
787 * - encoding: Set by user.
788 * - decoding: Set by libavcodec.
794 * position of the top left corner in 1/16 pel for up to 3 fields/frames
795 * - encoding: Set by user.
796 * - decoding: Set by libavcodec.
798 int16_t position[3][2];
801 #define FF_QSCALE_TYPE_MPEG1 0
802 #define FF_QSCALE_TYPE_MPEG2 1
803 #define FF_QSCALE_TYPE_H264 2
804 #define FF_QSCALE_TYPE_VP56 3
806 #if FF_API_GET_BUFFER
807 #define FF_BUFFER_TYPE_INTERNAL 1
808 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
809 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
810 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
812 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
813 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
814 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
815 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
819 * The decoder will keep a reference to the frame and may reuse it later.
821 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
824 * @defgroup lavc_packet AVPacket
826 * Types and functions for working with AVPacket.
829 enum AVPacketSideDataType {
831 AV_PKT_DATA_NEW_EXTRADATA,
834 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
837 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
838 * s32le channel_count
839 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
840 * u64le channel_layout
841 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
843 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
848 AV_PKT_DATA_PARAM_CHANGE,
851 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
852 * structures with info about macroblocks relevant to splitting the
853 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
854 * That is, it does not necessarily contain info about all macroblocks,
855 * as long as the distance between macroblocks in the info is smaller
856 * than the target payload size.
857 * Each MB info structure is 12 bytes, and is laid out as follows:
859 * u32le bit offset from the start of the packet
860 * u8 current quantizer at the start of the macroblock
862 * u16le macroblock address within the GOB
863 * u8 horizontal MV predictor
864 * u8 vertical MV predictor
865 * u8 horizontal MV predictor for block number 3
866 * u8 vertical MV predictor for block number 3
869 AV_PKT_DATA_H263_MB_INFO,
873 * This structure stores compressed data. It is typically exported by demuxers
874 * and then passed as input to decoders, or received as output from encoders and
875 * then passed to muxers.
877 * For video, it should typically contain one compressed frame. For audio it may
878 * contain several compressed frames.
880 * AVPacket is one of the few structs in Libav, whose size is a part of public
881 * ABI. Thus it may be allocated on stack and no new fields can be added to it
882 * without libavcodec and libavformat major bump.
884 * The semantics of data ownership depends on the buf or destruct (deprecated)
885 * fields. If either is set, the packet data is dynamically allocated and is
886 * valid indefinitely until av_free_packet() is called (which in turn calls
887 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
888 * the packet data is typically backed by some static buffer somewhere and is
889 * only valid for a limited time (e.g. until the next read call when demuxing).
891 * The side data is always allocated with av_malloc() and is freed in
894 typedef struct AVPacket {
896 * A reference to the reference-counted buffer where the packet data is
898 * May be NULL, then the packet data is not reference-counted.
902 * Presentation timestamp in AVStream->time_base units; the time at which
903 * the decompressed packet will be presented to the user.
904 * Can be AV_NOPTS_VALUE if it is not stored in the file.
905 * pts MUST be larger or equal to dts as presentation cannot happen before
906 * decompression, unless one wants to view hex dumps. Some formats misuse
907 * the terms dts and pts/cts to mean something different. Such timestamps
908 * must be converted to true pts/dts before they are stored in AVPacket.
912 * Decompression timestamp in AVStream->time_base units; the time at which
913 * the packet is decompressed.
914 * Can be AV_NOPTS_VALUE if it is not stored in the file.
921 * A combination of AV_PKT_FLAG values
925 * Additional packet data that can be provided by the container.
926 * Packet can contain several types of side information.
931 enum AVPacketSideDataType type;
936 * Duration of this packet in AVStream->time_base units, 0 if unknown.
937 * Equals next_pts - this_pts in presentation order.
940 #if FF_API_DESTRUCT_PACKET
942 void (*destruct)(struct AVPacket *);
946 int64_t pos; ///< byte position in stream, -1 if unknown
949 * Time difference in AVStream->time_base units from the pts of this
950 * packet to the point at which the output from the decoder has converged
951 * independent from the availability of previous frames. That is, the
952 * frames are virtually identical no matter if decoding started from
953 * the very first frame or from this keyframe.
954 * Is AV_NOPTS_VALUE if unknown.
955 * This field is not the display duration of the current packet.
956 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
959 * The purpose of this field is to allow seeking in streams that have no
960 * keyframes in the conventional sense. It corresponds to the
961 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
962 * essential for some types of subtitle streams to ensure that all
963 * subtitles are correctly displayed after seeking.
965 int64_t convergence_duration;
967 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
968 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
970 enum AVSideDataParamChangeFlags {
971 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
972 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
973 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
974 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
980 struct AVCodecInternal;
984 AV_FIELD_PROGRESSIVE,
985 AV_FIELD_TT, //< Top coded_first, top displayed first
986 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
987 AV_FIELD_TB, //< Top coded first, bottom displayed first
988 AV_FIELD_BT, //< Bottom coded first, top displayed first
992 * main external API structure.
993 * New fields can be added to the end with minor version bumps.
994 * Removal, reordering and changes to existing fields require a major
996 * sizeof(AVCodecContext) must not be used outside libav*.
998 typedef struct AVCodecContext {
1000 * information on struct for av_log
1001 * - set by avcodec_alloc_context3
1003 const AVClass *av_class;
1004 int log_level_offset;
1006 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1007 const struct AVCodec *codec;
1008 char codec_name[32];
1009 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1012 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1013 * This is used to work around some encoder bugs.
1014 * A demuxer should set this to what is stored in the field used to identify the codec.
1015 * If there are multiple such fields in a container then the demuxer should choose the one
1016 * which maximizes the information about the used codec.
1017 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1018 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1019 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1021 * - encoding: Set by user, if not then the default based on codec_id will be used.
1022 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1024 unsigned int codec_tag;
1027 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1028 * This is used to work around some encoder bugs.
1029 * - encoding: unused
1030 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1032 unsigned int stream_codec_tag;
1037 * Private context used for internal data.
1039 * Unlike priv_data, this is not codec-specific. It is used in general
1040 * libavcodec functions.
1042 struct AVCodecInternal *internal;
1045 * Private data of the user, can be used to carry app specific stuff.
1046 * - encoding: Set by user.
1047 * - decoding: Set by user.
1052 * the average bitrate
1053 * - encoding: Set by user; unused for constant quantizer encoding.
1054 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1059 * number of bits the bitstream is allowed to diverge from the reference.
1060 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1061 * - encoding: Set by user; unused for constant quantizer encoding.
1062 * - decoding: unused
1064 int bit_rate_tolerance;
1067 * Global quality for codecs which cannot change it per frame.
1068 * This should be proportional to MPEG-1/2/4 qscale.
1069 * - encoding: Set by user.
1070 * - decoding: unused
1075 * - encoding: Set by user.
1076 * - decoding: unused
1078 int compression_level;
1079 #define FF_COMPRESSION_DEFAULT -1
1083 * - encoding: Set by user.
1084 * - decoding: Set by user.
1090 * - encoding: Set by user.
1091 * - decoding: Set by user.
1096 * some codecs need / can use extradata like Huffman tables.
1097 * mjpeg: Huffman tables
1098 * rv10: additional flags
1099 * mpeg4: global headers (they can be in the bitstream or here)
1100 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1101 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1102 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1103 * - encoding: Set/allocated/freed by libavcodec.
1104 * - decoding: Set/allocated/freed by user.
1110 * This is the fundamental unit of time (in seconds) in terms
1111 * of which frame timestamps are represented. For fixed-fps content,
1112 * timebase should be 1/framerate and timestamp increments should be
1114 * - encoding: MUST be set by user.
1115 * - decoding: Set by libavcodec.
1117 AVRational time_base;
1120 * For some codecs, the time base is closer to the field rate than the frame rate.
1121 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1122 * if no telecine is used ...
1124 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1126 int ticks_per_frame;
1132 * Number of frames the decoded output will be delayed relative to the
1136 * For encoding, this is the number of "priming" samples added to the
1137 * beginning of the stream. The decoded output will be delayed by this
1138 * many samples relative to the input to the encoder. Note that this
1139 * field is purely informational and does not directly affect the pts
1140 * output by the encoder, which should always be based on the actual
1141 * presentation time, including any delay.
1142 * For decoding, this is the number of samples the decoder needs to
1143 * output before the decoder's output is valid. When seeking, you should
1144 * start decoding this many samples prior to your desired seek point.
1146 * - encoding: Set by libavcodec.
1147 * - decoding: Set by libavcodec.
1154 * picture width / height.
1155 * - encoding: MUST be set by user.
1156 * - decoding: May be set by the user before opening the decoder if known e.g.
1157 * from the container. Some decoders will require the dimensions
1158 * to be set by the caller. During decoding, the decoder may
1159 * overwrite those values as required.
1164 * Bitstream width / height, may be different from width/height e.g. when
1165 * the decoded frame is cropped before being output.
1166 * - encoding: unused
1167 * - decoding: May be set by the user before opening the decoder if known
1168 * e.g. from the container. During decoding, the decoder may
1169 * overwrite those values as required.
1171 int coded_width, coded_height;
1173 #define FF_ASPECT_EXTENDED 15
1176 * the number of pictures in a group of pictures, or 0 for intra_only
1177 * - encoding: Set by user.
1178 * - decoding: unused
1183 * Pixel format, see AV_PIX_FMT_xxx.
1184 * May be set by the demuxer if known from headers.
1185 * May be overriden by the decoder if it knows better.
1186 * - encoding: Set by user.
1187 * - decoding: Set by user if known, overridden by libavcodec if known
1189 enum AVPixelFormat pix_fmt;
1192 * Motion estimation algorithm used for video coding.
1193 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1194 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1195 * - encoding: MUST be set by user.
1196 * - decoding: unused
1201 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1202 * decoder to draw a horizontal band. It improves cache usage. Not
1203 * all codecs can do that. You must check the codec capabilities
1205 * When multithreading is used, it may be called from multiple threads
1206 * at the same time; threads might draw different parts of the same AVFrame,
1207 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1209 * The function is also used by hardware acceleration APIs.
1210 * It is called at least once during frame decoding to pass
1211 * the data needed for hardware render.
1212 * In that mode instead of pixel data, AVFrame points to
1213 * a structure specific to the acceleration API. The application
1214 * reads the structure and can change some fields to indicate progress
1216 * - encoding: unused
1217 * - decoding: Set by user.
1218 * @param height the height of the slice
1219 * @param y the y position of the slice
1220 * @param type 1->top field, 2->bottom field, 3->frame
1221 * @param offset offset into the AVFrame.data from which the slice should be read
1223 void (*draw_horiz_band)(struct AVCodecContext *s,
1224 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1225 int y, int type, int height);
1228 * callback to negotiate the pixelFormat
1229 * @param fmt is the list of formats which are supported by the codec,
1230 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1231 * The first is always the native one.
1232 * @return the chosen format
1233 * - encoding: unused
1234 * - decoding: Set by user, if not set the native format will be chosen.
1236 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1239 * maximum number of B-frames between non-B-frames
1240 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1241 * - encoding: Set by user.
1242 * - decoding: unused
1247 * qscale factor between IP and B-frames
1248 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1249 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1250 * - encoding: Set by user.
1251 * - decoding: unused
1253 float b_quant_factor;
1255 /** obsolete FIXME remove */
1257 #define FF_RC_STRATEGY_XVID 1
1259 int b_frame_strategy;
1262 * qscale offset between IP and B-frames
1263 * - encoding: Set by user.
1264 * - decoding: unused
1266 float b_quant_offset;
1269 * Size of the frame reordering buffer in the decoder.
1270 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1271 * - encoding: Set by libavcodec.
1272 * - decoding: Set by libavcodec.
1277 * 0-> h263 quant 1-> mpeg quant
1278 * - encoding: Set by user.
1279 * - decoding: unused
1284 * qscale factor between P and I-frames
1285 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1286 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1287 * - encoding: Set by user.
1288 * - decoding: unused
1290 float i_quant_factor;
1293 * qscale offset between P and I-frames
1294 * - encoding: Set by user.
1295 * - decoding: unused
1297 float i_quant_offset;
1300 * luminance masking (0-> disabled)
1301 * - encoding: Set by user.
1302 * - decoding: unused
1307 * temporary complexity masking (0-> disabled)
1308 * - encoding: Set by user.
1309 * - decoding: unused
1311 float temporal_cplx_masking;
1314 * spatial complexity masking (0-> disabled)
1315 * - encoding: Set by user.
1316 * - decoding: unused
1318 float spatial_cplx_masking;
1321 * p block masking (0-> disabled)
1322 * - encoding: Set by user.
1323 * - decoding: unused
1328 * darkness masking (0-> disabled)
1329 * - encoding: Set by user.
1330 * - decoding: unused
1336 * - encoding: Set by libavcodec.
1337 * - decoding: Set by user (or 0).
1341 * prediction method (needed for huffyuv)
1342 * - encoding: Set by user.
1343 * - decoding: unused
1345 int prediction_method;
1346 #define FF_PRED_LEFT 0
1347 #define FF_PRED_PLANE 1
1348 #define FF_PRED_MEDIAN 2
1351 * slice offsets in the frame in bytes
1352 * - encoding: Set/allocated by libavcodec.
1353 * - decoding: Set/allocated by user (or NULL).
1358 * sample aspect ratio (0 if unknown)
1359 * That is the width of a pixel divided by the height of the pixel.
1360 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1361 * - encoding: Set by user.
1362 * - decoding: Set by libavcodec.
1364 AVRational sample_aspect_ratio;
1367 * motion estimation comparison function
1368 * - encoding: Set by user.
1369 * - decoding: unused
1373 * subpixel motion estimation comparison function
1374 * - encoding: Set by user.
1375 * - decoding: unused
1379 * macroblock comparison function (not supported yet)
1380 * - encoding: Set by user.
1381 * - decoding: unused
1385 * interlaced DCT comparison function
1386 * - encoding: Set by user.
1387 * - decoding: unused
1390 #define FF_CMP_SAD 0
1391 #define FF_CMP_SSE 1
1392 #define FF_CMP_SATD 2
1393 #define FF_CMP_DCT 3
1394 #define FF_CMP_PSNR 4
1395 #define FF_CMP_BIT 5
1397 #define FF_CMP_ZERO 7
1398 #define FF_CMP_VSAD 8
1399 #define FF_CMP_VSSE 9
1400 #define FF_CMP_NSSE 10
1401 #define FF_CMP_DCTMAX 13
1402 #define FF_CMP_DCT264 14
1403 #define FF_CMP_CHROMA 256
1406 * ME diamond size & shape
1407 * - encoding: Set by user.
1408 * - decoding: unused
1413 * amount of previous MV predictors (2a+1 x 2a+1 square)
1414 * - encoding: Set by user.
1415 * - decoding: unused
1417 int last_predictor_count;
1420 * prepass for motion estimation
1421 * - encoding: Set by user.
1422 * - decoding: unused
1427 * motion estimation prepass comparison function
1428 * - encoding: Set by user.
1429 * - decoding: unused
1434 * ME prepass diamond size & shape
1435 * - encoding: Set by user.
1436 * - decoding: unused
1442 * - encoding: Set by user.
1443 * - decoding: unused
1445 int me_subpel_quality;
1448 * DTG active format information (additional aspect ratio
1449 * information only used in DVB MPEG-2 transport streams)
1452 * - encoding: unused
1453 * - decoding: Set by decoder.
1455 int dtg_active_format;
1456 #define FF_DTG_AFD_SAME 8
1457 #define FF_DTG_AFD_4_3 9
1458 #define FF_DTG_AFD_16_9 10
1459 #define FF_DTG_AFD_14_9 11
1460 #define FF_DTG_AFD_4_3_SP_14_9 13
1461 #define FF_DTG_AFD_16_9_SP_14_9 14
1462 #define FF_DTG_AFD_SP_4_3 15
1465 * maximum motion estimation search range in subpel units
1466 * If 0 then no limit.
1468 * - encoding: Set by user.
1469 * - decoding: unused
1474 * intra quantizer bias
1475 * - encoding: Set by user.
1476 * - decoding: unused
1478 int intra_quant_bias;
1479 #define FF_DEFAULT_QUANT_BIAS 999999
1482 * inter quantizer bias
1483 * - encoding: Set by user.
1484 * - decoding: unused
1486 int inter_quant_bias;
1490 * - encoding: unused
1491 * - decoding: Set by user.
1494 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1495 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1496 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1499 * XVideo Motion Acceleration
1500 * - encoding: forbidden
1501 * - decoding: set by decoder
1503 int xvmc_acceleration;
1506 * macroblock decision mode
1507 * - encoding: Set by user.
1508 * - decoding: unused
1511 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1512 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1513 #define FF_MB_DECISION_RD 2 ///< rate distortion
1516 * custom intra quantization matrix
1517 * - encoding: Set by user, can be NULL.
1518 * - decoding: Set by libavcodec.
1520 uint16_t *intra_matrix;
1523 * custom inter quantization matrix
1524 * - encoding: Set by user, can be NULL.
1525 * - decoding: Set by libavcodec.
1527 uint16_t *inter_matrix;
1530 * scene change detection threshold
1531 * 0 is default, larger means fewer detected scene changes.
1532 * - encoding: Set by user.
1533 * - decoding: unused
1535 int scenechange_threshold;
1538 * noise reduction strength
1539 * - encoding: Set by user.
1540 * - decoding: unused
1542 int noise_reduction;
1545 * Motion estimation threshold below which no motion estimation is
1546 * performed, but instead the user specified motion vectors are used.
1548 * - encoding: Set by user.
1549 * - decoding: unused
1554 * Macroblock threshold below which the user specified macroblock types will be used.
1555 * - encoding: Set by user.
1556 * - decoding: unused
1561 * precision of the intra DC coefficient - 8
1562 * - encoding: Set by user.
1563 * - decoding: unused
1565 int intra_dc_precision;
1568 * Number of macroblock rows at the top which are skipped.
1569 * - encoding: unused
1570 * - decoding: Set by user.
1575 * Number of macroblock rows at the bottom which are skipped.
1576 * - encoding: unused
1577 * - decoding: Set by user.
1582 * Border processing masking, raises the quantizer for mbs on the borders
1584 * - encoding: Set by user.
1585 * - decoding: unused
1587 float border_masking;
1590 * minimum MB lagrange multipler
1591 * - encoding: Set by user.
1592 * - decoding: unused
1597 * maximum MB lagrange multipler
1598 * - encoding: Set by user.
1599 * - decoding: unused
1605 * - encoding: Set by user.
1606 * - decoding: unused
1608 int me_penalty_compensation;
1612 * - encoding: Set by user.
1613 * - decoding: unused
1619 * - encoding: Set by user.
1620 * - decoding: unused
1626 * - encoding: Set by user.
1627 * - decoding: unused
1632 * number of reference frames
1633 * - encoding: Set by user.
1634 * - decoding: Set by lavc.
1639 * chroma qp offset from luma
1640 * - encoding: Set by user.
1641 * - decoding: unused
1646 * Multiplied by qscale for each frame and added to scene_change_score.
1647 * - encoding: Set by user.
1648 * - decoding: unused
1650 int scenechange_factor;
1654 * Note: Value depends upon the compare function used for fullpel ME.
1655 * - encoding: Set by user.
1656 * - decoding: unused
1661 * Adjust sensitivity of b_frame_strategy 1.
1662 * - encoding: Set by user.
1663 * - decoding: unused
1668 * Chromaticity coordinates of the source primaries.
1669 * - encoding: Set by user
1670 * - decoding: Set by libavcodec
1672 enum AVColorPrimaries color_primaries;
1675 * Color Transfer Characteristic.
1676 * - encoding: Set by user
1677 * - decoding: Set by libavcodec
1679 enum AVColorTransferCharacteristic color_trc;
1682 * YUV colorspace type.
1683 * - encoding: Set by user
1684 * - decoding: Set by libavcodec
1686 enum AVColorSpace colorspace;
1689 * MPEG vs JPEG YUV range.
1690 * - encoding: Set by user
1691 * - decoding: Set by libavcodec
1693 enum AVColorRange color_range;
1696 * This defines the location of chroma samples.
1697 * - encoding: Set by user
1698 * - decoding: Set by libavcodec
1700 enum AVChromaLocation chroma_sample_location;
1704 * Indicates number of picture subdivisions. Used for parallelized
1706 * - encoding: Set by user
1707 * - decoding: unused
1712 * - encoding: set by libavcodec
1713 * - decoding: Set by libavcodec
1715 enum AVFieldOrder field_order;
1718 int sample_rate; ///< samples per second
1719 int channels; ///< number of audio channels
1722 * audio sample format
1723 * - encoding: Set by user.
1724 * - decoding: Set by libavcodec.
1726 enum AVSampleFormat sample_fmt; ///< sample format
1728 /* The following data should not be initialized. */
1730 * Number of samples per channel in an audio frame.
1732 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1733 * except the last must contain exactly frame_size samples per channel.
1734 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1735 * frame size is not restricted.
1736 * - decoding: may be set by some decoders to indicate constant frame size
1741 * Frame counter, set by libavcodec.
1743 * - decoding: total number of frames returned from the decoder so far.
1744 * - encoding: total number of frames passed to the encoder so far.
1746 * @note the counter is not incremented if encoding/decoding resulted in
1752 * number of bytes per packet if constant and known or 0
1753 * Used by some WAV based audio codecs.
1758 * Audio cutoff bandwidth (0 means "automatic")
1759 * - encoding: Set by user.
1760 * - decoding: unused
1764 #if FF_API_REQUEST_CHANNELS
1766 * Decoder should decode to this many channels if it can (0 for default)
1767 * - encoding: unused
1768 * - decoding: Set by user.
1769 * @deprecated Deprecated in favor of request_channel_layout.
1771 int request_channels;
1775 * Audio channel layout.
1776 * - encoding: set by user.
1777 * - decoding: set by libavcodec.
1779 uint64_t channel_layout;
1782 * Request decoder to use this channel layout if it can (0 for default)
1783 * - encoding: unused
1784 * - decoding: Set by user.
1786 uint64_t request_channel_layout;
1789 * Type of service that the audio stream conveys.
1790 * - encoding: Set by user.
1791 * - decoding: Set by libavcodec.
1793 enum AVAudioServiceType audio_service_type;
1796 * Used to request a sample format from the decoder.
1797 * - encoding: unused.
1798 * - decoding: Set by user.
1800 enum AVSampleFormat request_sample_fmt;
1802 #if FF_API_GET_BUFFER
1804 * Called at the beginning of each frame to get a buffer for it.
1806 * The function will set AVFrame.data[], AVFrame.linesize[].
1807 * AVFrame.extended_data[] must also be set, but it should be the same as
1808 * AVFrame.data[] except for planar audio with more channels than can fit
1809 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1810 * many data pointers as it can hold.
1812 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1813 * avcodec_default_get_buffer() instead of providing buffers allocated by
1816 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1817 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1818 * but if get_buffer() is overridden then alignment considerations should
1819 * be taken into account.
1821 * @see avcodec_default_get_buffer()
1825 * If pic.reference is set then the frame will be read later by libavcodec.
1826 * avcodec_align_dimensions2() should be used to find the required width and
1827 * height, as they normally need to be rounded up to the next multiple of 16.
1829 * If frame multithreading is used and thread_safe_callbacks is set,
1830 * it may be called from a different thread, but not from more than one at
1831 * once. Does not need to be reentrant.
1833 * @see release_buffer(), reget_buffer()
1834 * @see avcodec_align_dimensions2()
1838 * Decoders request a buffer of a particular size by setting
1839 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1840 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1841 * to a smaller value in the output frame.
1843 * Decoders cannot use the buffer after returning from
1844 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1845 * is assumed to be released immediately upon return. In some rare cases,
1846 * a decoder may need to call get_buffer() more than once in a single
1847 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1848 * called again after it has already been called once, the previously
1849 * acquired buffer is assumed to be released at that time and may not be
1850 * reused by the decoder.
1852 * As a convenience, av_samples_get_buffer_size() and
1853 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1854 * functions to find the required data size and to fill data pointers and
1855 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1856 * since all planes must be the same size.
1858 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1860 * - encoding: unused
1861 * - decoding: Set by libavcodec, user can override.
1863 * @deprecated use get_buffer2()
1865 attribute_deprecated
1866 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1869 * Called to release buffers which were allocated with get_buffer.
1870 * A released buffer can be reused in get_buffer().
1871 * pic.data[*] must be set to NULL.
1872 * May be called from a different thread if frame multithreading is used,
1873 * but not by more than one thread at once, so does not need to be reentrant.
1874 * - encoding: unused
1875 * - decoding: Set by libavcodec, user can override.
1877 * @deprecated custom freeing callbacks should be set from get_buffer2()
1879 attribute_deprecated
1880 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1883 * Called at the beginning of a frame to get cr buffer for it.
1884 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1885 * libavcodec will pass previous buffer in pic, function should return
1886 * same buffer or new buffer with old frame "painted" into it.
1887 * If pic.data[0] == NULL must behave like get_buffer().
1888 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1889 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1891 * - encoding: unused
1892 * - decoding: Set by libavcodec, user can override.
1894 attribute_deprecated
1895 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1899 * This callback is called at the beginning of each frame to get data
1900 * buffer(s) for it. There may be one contiguous buffer for all the data or
1901 * there may be a buffer per each data plane or anything in between. What
1902 * this means is, you may set however many entries in buf[] you feel necessary.
1903 * Each buffer must be reference-counted using the AVBuffer API (see description
1906 * The following fields will be set in the frame before this callback is
1909 * - width, height (video only)
1910 * - sample_rate, channel_layout, nb_samples (audio only)
1911 * Their values may differ from the corresponding values in
1912 * AVCodecContext. This callback must use the frame values, not the codec
1913 * context values, to calculate the required buffer size.
1915 * This callback must fill the following fields in the frame:
1919 * * if the data is planar audio with more than 8 channels, then this
1920 * callback must allocate and fill extended_data to contain all pointers
1921 * to all data planes. data[] must hold as many pointers as it can.
1922 * extended_data must be allocated with av_malloc() and will be freed in
1924 * * otherwise exended_data must point to data
1925 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1926 * the frame's data and extended_data pointers must be contained in these. That
1927 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1928 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1929 * and av_buffer_ref().
1930 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1931 * this callback and filled with the extra buffers if there are more
1932 * buffers than buf[] can hold. extended_buf will be freed in
1935 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
1936 * avcodec_default_get_buffer2() instead of providing buffers allocated by
1939 * Each data plane must be aligned to the maximum required by the target
1942 * @see avcodec_default_get_buffer2()
1946 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
1947 * (read and/or written to if it is writable) later by libavcodec.
1949 * If CODEC_FLAG_EMU_EDGE is not set in s->flags, the buffer must contain an
1950 * edge of the size returned by avcodec_get_edge_width() on all sides.
1952 * avcodec_align_dimensions2() should be used to find the required width and
1953 * height, as they normally need to be rounded up to the next multiple of 16.
1955 * If frame multithreading is used and thread_safe_callbacks is set,
1956 * this callback may be called from a different thread, but not from more
1957 * than one at once. Does not need to be reentrant.
1959 * @see avcodec_align_dimensions2()
1963 * Decoders request a buffer of a particular size by setting
1964 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
1965 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1966 * to a smaller value in the output frame.
1968 * As a convenience, av_samples_get_buffer_size() and
1969 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
1970 * functions to find the required data size and to fill data pointers and
1971 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1972 * since all planes must be the same size.
1974 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1976 * - encoding: unused
1977 * - decoding: Set by libavcodec, user can override.
1979 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
1982 * If non-zero, the decoded audio and video frames returned from
1983 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
1984 * and are valid indefinitely. The caller must free them with
1985 * av_frame_unref() when they are not needed anymore.
1986 * Otherwise, the decoded frames must not be freed by the caller and are
1987 * only valid until the next decode call.
1989 * - encoding: unused
1990 * - decoding: set by the caller before avcodec_open2().
1992 int refcounted_frames;
1994 /* - encoding parameters */
1995 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
1996 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2000 * - encoding: Set by user.
2001 * - decoding: unused
2007 * - encoding: Set by user.
2008 * - decoding: unused
2013 * maximum quantizer difference between frames
2014 * - encoding: Set by user.
2015 * - decoding: unused
2020 * ratecontrol qmin qmax limiting method
2021 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2022 * - encoding: Set by user.
2023 * - decoding: unused
2031 * decoder bitstream buffer size
2032 * - encoding: Set by user.
2033 * - decoding: unused
2038 * ratecontrol override, see RcOverride
2039 * - encoding: Allocated/set/freed by user.
2040 * - decoding: unused
2042 int rc_override_count;
2043 RcOverride *rc_override;
2046 * rate control equation
2047 * - encoding: Set by user
2048 * - decoding: unused
2054 * - encoding: Set by user.
2055 * - decoding: unused
2061 * - encoding: Set by user.
2062 * - decoding: unused
2066 float rc_buffer_aggressivity;
2069 * initial complexity for pass1 ratecontrol
2070 * - encoding: Set by user.
2071 * - decoding: unused
2073 float rc_initial_cplx;
2076 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2077 * - encoding: Set by user.
2078 * - decoding: unused.
2080 float rc_max_available_vbv_use;
2083 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2084 * - encoding: Set by user.
2085 * - decoding: unused.
2087 float rc_min_vbv_overflow_use;
2090 * Number of bits which should be loaded into the rc buffer before decoding starts.
2091 * - encoding: Set by user.
2092 * - decoding: unused
2094 int rc_initial_buffer_occupancy;
2096 #define FF_CODER_TYPE_VLC 0
2097 #define FF_CODER_TYPE_AC 1
2098 #define FF_CODER_TYPE_RAW 2
2099 #define FF_CODER_TYPE_RLE 3
2100 #define FF_CODER_TYPE_DEFLATE 4
2103 * - encoding: Set by user.
2104 * - decoding: unused
2110 * - encoding: Set by user.
2111 * - decoding: unused
2116 * minimum Lagrange multipler
2117 * - encoding: Set by user.
2118 * - decoding: unused
2123 * maximum Lagrange multipler
2124 * - encoding: Set by user.
2125 * - decoding: unused
2130 * frame skip threshold
2131 * - encoding: Set by user.
2132 * - decoding: unused
2134 int frame_skip_threshold;
2138 * - encoding: Set by user.
2139 * - decoding: unused
2141 int frame_skip_factor;
2144 * frame skip exponent
2145 * - encoding: Set by user.
2146 * - decoding: unused
2151 * frame skip comparison function
2152 * - encoding: Set by user.
2153 * - decoding: unused
2158 * trellis RD quantization
2159 * - encoding: Set by user.
2160 * - decoding: unused
2165 * - encoding: Set by user.
2166 * - decoding: unused
2168 int min_prediction_order;
2171 * - encoding: Set by user.
2172 * - decoding: unused
2174 int max_prediction_order;
2177 * GOP timecode frame start number, in non drop frame format
2178 * - encoding: Set by user.
2179 * - decoding: unused
2181 int64_t timecode_frame_start;
2183 /* The RTP callback: This function is called */
2184 /* every time the encoder has a packet to send. */
2185 /* It depends on the encoder if the data starts */
2186 /* with a Start Code (it should). H.263 does. */
2187 /* mb_nb contains the number of macroblocks */
2188 /* encoded in the RTP payload. */
2189 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2191 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2192 /* do its best to deliver a chunk with size */
2193 /* below rtp_payload_size, the chunk will start */
2194 /* with a start code on some codecs like H.263. */
2195 /* This doesn't take account of any particular */
2196 /* headers inside the transmitted RTP payload. */
2198 /* statistics, used for 2-pass encoding */
2209 * number of bits used for the previously encoded frame
2210 * - encoding: Set by libavcodec.
2211 * - decoding: unused
2216 * pass1 encoding statistics output buffer
2217 * - encoding: Set by libavcodec.
2218 * - decoding: unused
2223 * pass2 encoding statistics input buffer
2224 * Concatenated stuff from stats_out of pass1 should be placed here.
2225 * - encoding: Allocated/set/freed by user.
2226 * - decoding: unused
2231 * Work around bugs in encoders which sometimes cannot be detected automatically.
2232 * - encoding: Set by user
2233 * - decoding: Set by user
2235 int workaround_bugs;
2236 #define FF_BUG_AUTODETECT 1 ///< autodetection
2237 #define FF_BUG_OLD_MSMPEG4 2
2238 #define FF_BUG_XVID_ILACE 4
2239 #define FF_BUG_UMP4 8
2240 #define FF_BUG_NO_PADDING 16
2241 #define FF_BUG_AMV 32
2242 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2243 #define FF_BUG_QPEL_CHROMA 64
2244 #define FF_BUG_STD_QPEL 128
2245 #define FF_BUG_QPEL_CHROMA2 256
2246 #define FF_BUG_DIRECT_BLOCKSIZE 512
2247 #define FF_BUG_EDGE 1024
2248 #define FF_BUG_HPEL_CHROMA 2048
2249 #define FF_BUG_DC_CLIP 4096
2250 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2251 #define FF_BUG_TRUNCATED 16384
2254 * strictly follow the standard (MPEG4, ...).
2255 * - encoding: Set by user.
2256 * - decoding: Set by user.
2257 * Setting this to STRICT or higher means the encoder and decoder will
2258 * generally do stupid things, whereas setting it to unofficial or lower
2259 * will mean the encoder might produce output that is not supported by all
2260 * spec-compliant decoders. Decoders don't differentiate between normal,
2261 * unofficial and experimental (that is, they always try to decode things
2262 * when they can) unless they are explicitly asked to behave stupidly
2263 * (=strictly conform to the specs)
2265 int strict_std_compliance;
2266 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2267 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2268 #define FF_COMPLIANCE_NORMAL 0
2269 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2270 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2273 * error concealment flags
2274 * - encoding: unused
2275 * - decoding: Set by user.
2277 int error_concealment;
2278 #define FF_EC_GUESS_MVS 1
2279 #define FF_EC_DEBLOCK 2
2283 * - encoding: Set by user.
2284 * - decoding: Set by user.
2287 #define FF_DEBUG_PICT_INFO 1
2288 #define FF_DEBUG_RC 2
2289 #define FF_DEBUG_BITSTREAM 4
2290 #define FF_DEBUG_MB_TYPE 8
2291 #define FF_DEBUG_QP 16
2292 #define FF_DEBUG_MV 32
2293 #define FF_DEBUG_DCT_COEFF 0x00000040
2294 #define FF_DEBUG_SKIP 0x00000080
2295 #define FF_DEBUG_STARTCODE 0x00000100
2296 #define FF_DEBUG_PTS 0x00000200
2297 #define FF_DEBUG_ER 0x00000400
2298 #define FF_DEBUG_MMCO 0x00000800
2299 #define FF_DEBUG_BUGS 0x00001000
2300 #define FF_DEBUG_VIS_QP 0x00002000
2301 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2302 #define FF_DEBUG_BUFFERS 0x00008000
2303 #define FF_DEBUG_THREADS 0x00010000
2307 * - encoding: Set by user.
2308 * - decoding: Set by user.
2311 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2312 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2313 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2316 * Error recognition; may misdetect some more or less valid parts as errors.
2317 * - encoding: unused
2318 * - decoding: Set by user.
2320 int err_recognition;
2321 #define AV_EF_CRCCHECK (1<<0)
2322 #define AV_EF_BITSTREAM (1<<1)
2323 #define AV_EF_BUFFER (1<<2)
2324 #define AV_EF_EXPLODE (1<<3)
2327 * opaque 64bit number (generally a PTS) that will be reordered and
2328 * output in AVFrame.reordered_opaque
2329 * @deprecated in favor of pkt_pts
2330 * - encoding: unused
2331 * - decoding: Set by user.
2333 int64_t reordered_opaque;
2336 * Hardware accelerator in use
2337 * - encoding: unused.
2338 * - decoding: Set by libavcodec
2340 struct AVHWAccel *hwaccel;
2343 * Hardware accelerator context.
2344 * For some hardware accelerators, a global context needs to be
2345 * provided by the user. In that case, this holds display-dependent
2346 * data Libav cannot instantiate itself. Please refer to the
2347 * Libav HW accelerator documentation to know how to fill this
2348 * is. e.g. for VA API, this is a struct vaapi_context.
2349 * - encoding: unused
2350 * - decoding: Set by user
2352 void *hwaccel_context;
2356 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2357 * - decoding: unused
2359 uint64_t error[AV_NUM_DATA_POINTERS];
2362 * DCT algorithm, see FF_DCT_* below
2363 * - encoding: Set by user.
2364 * - decoding: unused
2367 #define FF_DCT_AUTO 0
2368 #define FF_DCT_FASTINT 1
2369 #define FF_DCT_INT 2
2370 #define FF_DCT_MMX 3
2371 #define FF_DCT_ALTIVEC 5
2372 #define FF_DCT_FAAN 6
2375 * IDCT algorithm, see FF_IDCT_* below.
2376 * - encoding: Set by user.
2377 * - decoding: Set by user.
2380 #define FF_IDCT_AUTO 0
2381 #define FF_IDCT_INT 1
2382 #define FF_IDCT_SIMPLE 2
2383 #define FF_IDCT_SIMPLEMMX 3
2384 #define FF_IDCT_ARM 7
2385 #define FF_IDCT_ALTIVEC 8
2386 #define FF_IDCT_SH4 9
2387 #define FF_IDCT_SIMPLEARM 10
2388 #define FF_IDCT_IPP 13
2389 #define FF_IDCT_XVIDMMX 14
2390 #define FF_IDCT_SIMPLEARMV5TE 16
2391 #define FF_IDCT_SIMPLEARMV6 17
2392 #define FF_IDCT_SIMPLEVIS 18
2393 #define FF_IDCT_FAAN 20
2394 #define FF_IDCT_SIMPLENEON 22
2395 #define FF_IDCT_SIMPLEALPHA 23
2398 * bits per sample/pixel from the demuxer (needed for huffyuv).
2399 * - encoding: Set by libavcodec.
2400 * - decoding: Set by user.
2402 int bits_per_coded_sample;
2405 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2406 * - encoding: set by user.
2407 * - decoding: set by libavcodec.
2409 int bits_per_raw_sample;
2413 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2414 * - encoding: unused
2415 * - decoding: Set by user.
2417 * @deprecated use decoder private options instead
2419 attribute_deprecated int lowres;
2423 * the picture in the bitstream
2424 * - encoding: Set by libavcodec.
2425 * - decoding: Set by libavcodec.
2427 AVFrame *coded_frame;
2431 * is used to decide how many independent tasks should be passed to execute()
2432 * - encoding: Set by user.
2433 * - decoding: Set by user.
2438 * Which multithreading methods to use.
2439 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2440 * so clients which cannot provide future frames should not use it.
2442 * - encoding: Set by user, otherwise the default is used.
2443 * - decoding: Set by user, otherwise the default is used.
2446 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2447 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2450 * Which multithreading methods are in use by the codec.
2451 * - encoding: Set by libavcodec.
2452 * - decoding: Set by libavcodec.
2454 int active_thread_type;
2457 * Set by the client if its custom get_buffer() callback can be called
2458 * synchronously from another thread, which allows faster multithreaded decoding.
2459 * draw_horiz_band() will be called from other threads regardless of this setting.
2460 * Ignored if the default get_buffer() is used.
2461 * - encoding: Set by user.
2462 * - decoding: Set by user.
2464 int thread_safe_callbacks;
2467 * The codec may call this to execute several independent things.
2468 * It will return only after finishing all tasks.
2469 * The user may replace this with some multithreaded implementation,
2470 * the default implementation will execute the parts serially.
2471 * @param count the number of things to execute
2472 * - encoding: Set by libavcodec, user can override.
2473 * - decoding: Set by libavcodec, user can override.
2475 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2478 * The codec may call this to execute several independent things.
2479 * It will return only after finishing all tasks.
2480 * The user may replace this with some multithreaded implementation,
2481 * the default implementation will execute the parts serially.
2482 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2483 * @param c context passed also to func
2484 * @param count the number of things to execute
2485 * @param arg2 argument passed unchanged to func
2486 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2487 * @param func function that will be called count times, with jobnr from 0 to count-1.
2488 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2489 * two instances of func executing at the same time will have the same threadnr.
2490 * @return always 0 currently, but code should handle a future improvement where when any call to func
2491 * returns < 0 no further calls to func may be done and < 0 is returned.
2492 * - encoding: Set by libavcodec, user can override.
2493 * - decoding: Set by libavcodec, user can override.
2495 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2499 * Can be used by execute() to store some per AVCodecContext stuff.
2500 * - encoding: set by execute()
2501 * - decoding: set by execute()
2503 void *thread_opaque;
2506 * noise vs. sse weight for the nsse comparsion function
2507 * - encoding: Set by user.
2508 * - decoding: unused
2514 * - encoding: Set by user.
2515 * - decoding: Set by libavcodec.
2518 #define FF_PROFILE_UNKNOWN -99
2519 #define FF_PROFILE_RESERVED -100
2521 #define FF_PROFILE_AAC_MAIN 0
2522 #define FF_PROFILE_AAC_LOW 1
2523 #define FF_PROFILE_AAC_SSR 2
2524 #define FF_PROFILE_AAC_LTP 3
2525 #define FF_PROFILE_AAC_HE 4
2526 #define FF_PROFILE_AAC_HE_V2 28
2527 #define FF_PROFILE_AAC_LD 22
2528 #define FF_PROFILE_AAC_ELD 38
2530 #define FF_PROFILE_DTS 20
2531 #define FF_PROFILE_DTS_ES 30
2532 #define FF_PROFILE_DTS_96_24 40
2533 #define FF_PROFILE_DTS_HD_HRA 50
2534 #define FF_PROFILE_DTS_HD_MA 60
2536 #define FF_PROFILE_MPEG2_422 0
2537 #define FF_PROFILE_MPEG2_HIGH 1
2538 #define FF_PROFILE_MPEG2_SS 2
2539 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2540 #define FF_PROFILE_MPEG2_MAIN 4
2541 #define FF_PROFILE_MPEG2_SIMPLE 5
2543 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2544 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2546 #define FF_PROFILE_H264_BASELINE 66
2547 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2548 #define FF_PROFILE_H264_MAIN 77
2549 #define FF_PROFILE_H264_EXTENDED 88
2550 #define FF_PROFILE_H264_HIGH 100
2551 #define FF_PROFILE_H264_HIGH_10 110
2552 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2553 #define FF_PROFILE_H264_HIGH_422 122
2554 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2555 #define FF_PROFILE_H264_HIGH_444 144
2556 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2557 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2558 #define FF_PROFILE_H264_CAVLC_444 44
2560 #define FF_PROFILE_VC1_SIMPLE 0
2561 #define FF_PROFILE_VC1_MAIN 1
2562 #define FF_PROFILE_VC1_COMPLEX 2
2563 #define FF_PROFILE_VC1_ADVANCED 3
2565 #define FF_PROFILE_MPEG4_SIMPLE 0
2566 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2567 #define FF_PROFILE_MPEG4_CORE 2
2568 #define FF_PROFILE_MPEG4_MAIN 3
2569 #define FF_PROFILE_MPEG4_N_BIT 4
2570 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2571 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2572 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2573 #define FF_PROFILE_MPEG4_HYBRID 8
2574 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2575 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2576 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2577 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2578 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2579 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2580 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2582 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2583 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2584 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2585 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2586 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2590 * - encoding: Set by user.
2591 * - decoding: Set by libavcodec.
2594 #define FF_LEVEL_UNKNOWN -99
2598 * - encoding: unused
2599 * - decoding: Set by user.
2601 enum AVDiscard skip_loop_filter;
2605 * - encoding: unused
2606 * - decoding: Set by user.
2608 enum AVDiscard skip_idct;
2612 * - encoding: unused
2613 * - decoding: Set by user.
2615 enum AVDiscard skip_frame;
2618 * Header containing style information for text subtitles.
2619 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2620 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2621 * the Format line following. It shouldn't include any Dialogue line.
2622 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2623 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2625 uint8_t *subtitle_header;
2626 int subtitle_header_size;
2629 * Simulates errors in the bitstream to test error concealment.
2630 * - encoding: Set by user.
2631 * - decoding: unused
2636 * Current packet as passed into the decoder, to avoid having
2637 * to pass the packet into every function. Currently only valid
2638 * inside lavc and get/release_buffer callbacks.
2639 * - decoding: set by avcodec_decode_*, read by get_buffer() for setting pkt_pts
2640 * - encoding: unused
2645 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2646 * Used for compliant TS muxing.
2647 * - encoding: Set by libavcodec.
2648 * - decoding: unused.
2656 typedef struct AVProfile {
2658 const char *name; ///< short name for the profile
2661 typedef struct AVCodecDefault AVCodecDefault;
2668 typedef struct AVCodec {
2670 * Name of the codec implementation.
2671 * The name is globally unique among encoders and among decoders (but an
2672 * encoder and a decoder can share the same name).
2673 * This is the primary way to find a codec from the user perspective.
2677 * Descriptive name for the codec, meant to be more human readable than name.
2678 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2680 const char *long_name;
2681 enum AVMediaType type;
2684 * Codec capabilities.
2688 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2689 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2690 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2691 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2692 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2693 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2694 const AVClass *priv_class; ///< AVClass for the private context
2695 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2697 /*****************************************************************
2698 * No fields below this line are part of the public API. They
2699 * may not be used outside of libavcodec and can be changed and
2701 * New public fields should be added right above.
2702 *****************************************************************
2705 struct AVCodec *next;
2707 * @name Frame-level threading support functions
2711 * If defined, called on thread contexts when they are created.
2712 * If the codec allocates writable tables in init(), re-allocate them here.
2713 * priv_data will be set to a copy of the original.
2715 int (*init_thread_copy)(AVCodecContext *);
2717 * Copy necessary context variables from a previous thread context to the current one.
2718 * If not defined, the next thread will start automatically; otherwise, the codec
2719 * must call ff_thread_finish_setup().
2721 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2723 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2727 * Private codec-specific defaults.
2729 const AVCodecDefault *defaults;
2732 * Initialize codec static data, called from avcodec_register().
2734 void (*init_static_data)(struct AVCodec *codec);
2736 int (*init)(AVCodecContext *);
2737 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2738 const struct AVSubtitle *sub);
2740 * Encode data to an AVPacket.
2742 * @param avctx codec context
2743 * @param avpkt output AVPacket (may contain a user-provided buffer)
2744 * @param[in] frame AVFrame containing the raw data to be encoded
2745 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2746 * non-empty packet was returned in avpkt.
2747 * @return 0 on success, negative error code on failure
2749 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2750 int *got_packet_ptr);
2751 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2752 int (*close)(AVCodecContext *);
2755 * Will be called when seeking
2757 void (*flush)(AVCodecContext *);
2763 typedef struct AVHWAccel {
2765 * Name of the hardware accelerated codec.
2766 * The name is globally unique among encoders and among decoders (but an
2767 * encoder and a decoder can share the same name).
2772 * Type of codec implemented by the hardware accelerator.
2774 * See AVMEDIA_TYPE_xxx
2776 enum AVMediaType type;
2779 * Codec implemented by the hardware accelerator.
2781 * See AV_CODEC_ID_xxx
2786 * Supported pixel format.
2788 * Only hardware accelerated formats are supported here.
2790 enum AVPixelFormat pix_fmt;
2793 * Hardware accelerated codec capabilities.
2794 * see FF_HWACCEL_CODEC_CAP_*
2798 struct AVHWAccel *next;
2801 * Called at the beginning of each frame or field picture.
2803 * Meaningful frame information (codec specific) is guaranteed to
2804 * be parsed at this point. This function is mandatory.
2806 * Note that buf can be NULL along with buf_size set to 0.
2807 * Otherwise, this means the whole frame is available at this point.
2809 * @param avctx the codec context
2810 * @param buf the frame data buffer base
2811 * @param buf_size the size of the frame in bytes
2812 * @return zero if successful, a negative value otherwise
2814 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2817 * Callback for each slice.
2819 * Meaningful slice information (codec specific) is guaranteed to
2820 * be parsed at this point. This function is mandatory.
2822 * @param avctx the codec context
2823 * @param buf the slice data buffer base
2824 * @param buf_size the size of the slice in bytes
2825 * @return zero if successful, a negative value otherwise
2827 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2830 * Called at the end of each frame or field picture.
2832 * The whole picture is parsed at this point and can now be sent
2833 * to the hardware accelerator. This function is mandatory.
2835 * @param avctx the codec context
2836 * @return zero if successful, a negative value otherwise
2838 int (*end_frame)(AVCodecContext *avctx);
2841 * Size of HW accelerator private data.
2843 * Private data is allocated with av_mallocz() before
2844 * AVCodecContext.get_buffer() and deallocated after
2845 * AVCodecContext.release_buffer().
2851 * @defgroup lavc_picture AVPicture
2853 * Functions for working with AVPicture
2858 * four components are given, that's all.
2859 * the last component is alpha
2861 typedef struct AVPicture {
2862 uint8_t *data[AV_NUM_DATA_POINTERS];
2863 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2870 #define AVPALETTE_SIZE 1024
2871 #define AVPALETTE_COUNT 256
2873 enum AVSubtitleType {
2876 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2879 * Plain text, the text field must be set by the decoder and is
2880 * authoritative. ass and pict fields may contain approximations.
2885 * Formatted text, the ass field must be set by the decoder and is
2886 * authoritative. pict and text fields may contain approximations.
2891 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
2893 typedef struct AVSubtitleRect {
2894 int x; ///< top left corner of pict, undefined when pict is not set
2895 int y; ///< top left corner of pict, undefined when pict is not set
2896 int w; ///< width of pict, undefined when pict is not set
2897 int h; ///< height of pict, undefined when pict is not set
2898 int nb_colors; ///< number of colors in pict, undefined when pict is not set
2901 * data+linesize for the bitmap of this subtitle.
2902 * can be set for text/ass as well once they where rendered
2905 enum AVSubtitleType type;
2907 char *text; ///< 0 terminated plain UTF-8 text
2910 * 0 terminated ASS/SSA compatible event line.
2911 * The pressentation of this is unaffected by the other values in this
2918 typedef struct AVSubtitle {
2919 uint16_t format; /* 0 = graphics */
2920 uint32_t start_display_time; /* relative to packet pts, in ms */
2921 uint32_t end_display_time; /* relative to packet pts, in ms */
2923 AVSubtitleRect **rects;
2924 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
2928 * If c is NULL, returns the first registered codec,
2929 * if c is non-NULL, returns the next registered codec after c,
2930 * or NULL if c is the last one.
2932 AVCodec *av_codec_next(const AVCodec *c);
2935 * Return the LIBAVCODEC_VERSION_INT constant.
2937 unsigned avcodec_version(void);
2940 * Return the libavcodec build-time configuration.
2942 const char *avcodec_configuration(void);
2945 * Return the libavcodec license.
2947 const char *avcodec_license(void);
2950 * Register the codec codec and initialize libavcodec.
2952 * @warning either this function or avcodec_register_all() must be called
2953 * before any other libavcodec functions.
2955 * @see avcodec_register_all()
2957 void avcodec_register(AVCodec *codec);
2960 * Register all the codecs, parsers and bitstream filters which were enabled at
2961 * configuration time. If you do not call this function you can select exactly
2962 * which formats you want to support, by using the individual registration
2965 * @see avcodec_register
2966 * @see av_register_codec_parser
2967 * @see av_register_bitstream_filter
2969 void avcodec_register_all(void);
2972 * Allocate an AVCodecContext and set its fields to default values. The
2973 * resulting struct can be deallocated by calling avcodec_close() on it followed
2976 * @param codec if non-NULL, allocate private data and initialize defaults
2977 * for the given codec. It is illegal to then call avcodec_open2()
2978 * with a different codec.
2979 * If NULL, then the codec-specific defaults won't be initialized,
2980 * which may result in suboptimal default settings (this is
2981 * important mainly for encoders, e.g. libx264).
2983 * @return An AVCodecContext filled with default values or NULL on failure.
2984 * @see avcodec_get_context_defaults
2986 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
2989 * Set the fields of the given AVCodecContext to default values corresponding
2990 * to the given codec (defaults may be codec-dependent).
2992 * Do not call this function if a non-NULL codec has been passed
2993 * to avcodec_alloc_context3() that allocated this AVCodecContext.
2994 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
2995 * different codec on this AVCodecContext.
2997 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3000 * Get the AVClass for AVCodecContext. It can be used in combination with
3001 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3003 * @see av_opt_find().
3005 const AVClass *avcodec_get_class(void);
3008 * Copy the settings of the source AVCodecContext into the destination
3009 * AVCodecContext. The resulting destination codec context will be
3010 * unopened, i.e. you are required to call avcodec_open2() before you
3011 * can use this AVCodecContext to decode/encode video/audio data.
3013 * @param dest target codec context, should be initialized with
3014 * avcodec_alloc_context3(), but otherwise uninitialized
3015 * @param src source codec context
3016 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3018 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3021 * Allocate an AVFrame and set its fields to default values. The resulting
3022 * struct must be freed using avcodec_free_frame().
3024 * @return An AVFrame filled with default values or NULL on failure.
3025 * @see avcodec_get_frame_defaults
3027 AVFrame *avcodec_alloc_frame(void);
3030 * Set the fields of the given AVFrame to default values.
3032 * @param frame The AVFrame of which the fields should be set to default values.
3034 void avcodec_get_frame_defaults(AVFrame *frame);
3037 * Free the frame and any dynamically allocated objects in it,
3038 * e.g. extended_data.
3040 * @param frame frame to be freed. The pointer will be set to NULL.
3042 * @warning this function does NOT free the data buffers themselves
3043 * (it does not know how, since they might have been allocated with
3044 * a custom get_buffer()).
3046 void avcodec_free_frame(AVFrame **frame);
3049 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3050 * function the context has to be allocated with avcodec_alloc_context3().
3052 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3053 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3054 * retrieving a codec.
3056 * @warning This function is not thread safe!
3059 * avcodec_register_all();
3060 * av_dict_set(&opts, "b", "2.5M", 0);
3061 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3065 * context = avcodec_alloc_context3(codec);
3067 * if (avcodec_open2(context, codec, opts) < 0)
3071 * @param avctx The context to initialize.
3072 * @param codec The codec to open this context for. If a non-NULL codec has been
3073 * previously passed to avcodec_alloc_context3() or
3074 * avcodec_get_context_defaults3() for this context, then this
3075 * parameter MUST be either NULL or equal to the previously passed
3077 * @param options A dictionary filled with AVCodecContext and codec-private options.
3078 * On return this object will be filled with options that were not found.
3080 * @return zero on success, a negative value on error
3081 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3082 * av_dict_set(), av_opt_find().
3084 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3087 * Close a given AVCodecContext and free all the data associated with it
3088 * (but not the AVCodecContext itself).
3090 * Calling this function on an AVCodecContext that hasn't been opened will free
3091 * the codec-specific data allocated in avcodec_alloc_context3() /
3092 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3095 int avcodec_close(AVCodecContext *avctx);
3098 * Free all allocated data in the given subtitle struct.
3100 * @param sub AVSubtitle to free.
3102 void avsubtitle_free(AVSubtitle *sub);
3109 * @addtogroup lavc_packet
3113 #if FF_API_DESTRUCT_PACKET
3115 * Default packet destructor.
3116 * @deprecated use the AVBuffer API instead
3118 attribute_deprecated
3119 void av_destruct_packet(AVPacket *pkt);
3123 * Initialize optional fields of a packet with default values.
3125 * Note, this does not touch the data and size members, which have to be
3126 * initialized separately.
3130 void av_init_packet(AVPacket *pkt);
3133 * Allocate the payload of a packet and initialize its fields with
3137 * @param size wanted payload size
3138 * @return 0 if OK, AVERROR_xxx otherwise
3140 int av_new_packet(AVPacket *pkt, int size);
3143 * Reduce packet size, correctly zeroing padding
3146 * @param size new size
3148 void av_shrink_packet(AVPacket *pkt, int size);
3151 * Increase packet size, correctly zeroing padding
3154 * @param grow_by number of bytes by which to increase the size of the packet
3156 int av_grow_packet(AVPacket *pkt, int grow_by);
3159 * Initialize a reference-counted packet from av_malloc()ed data.
3161 * @param pkt packet to be initialized. This function will set the data, size,
3162 * buf and destruct fields, all others are left untouched.
3163 * @param data Data allocated by av_malloc() to be used as packet data. If this
3164 * function returns successfully, the data is owned by the underlying AVBuffer.
3165 * The caller may not access the data through other means.
3166 * @param size size of data in bytes, without the padding. I.e. the full buffer
3167 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3169 * @return 0 on success, a negative AVERROR on error
3171 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3174 * @warning This is a hack - the packet memory allocation stuff is broken. The
3175 * packet is allocated if it was not really allocated.
3177 int av_dup_packet(AVPacket *pkt);
3182 * @param pkt packet to free
3184 void av_free_packet(AVPacket *pkt);
3187 * Allocate new information of a packet.
3190 * @param type side information type
3191 * @param size side information size
3192 * @return pointer to fresh allocated data or NULL otherwise
3194 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3198 * Shrink the already allocated side data buffer
3201 * @param type side information type
3202 * @param size new side information size
3203 * @return 0 on success, < 0 on failure
3205 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3209 * Get side information from packet.
3212 * @param type desired side information type
3213 * @param size pointer for side information size to store (optional)
3214 * @return pointer to data if present or NULL otherwise
3216 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3224 * @addtogroup lavc_decoding
3229 * Find a registered decoder with a matching codec ID.
3231 * @param id AVCodecID of the requested decoder
3232 * @return A decoder if one was found, NULL otherwise.
3234 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3237 * Find a registered decoder with the specified name.
3239 * @param name name of the requested decoder
3240 * @return A decoder if one was found, NULL otherwise.
3242 AVCodec *avcodec_find_decoder_by_name(const char *name);
3244 #if FF_API_GET_BUFFER
3245 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3246 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3247 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3251 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3252 * it can be called by custom get_buffer2() implementations for decoders without
3253 * CODEC_CAP_DR1 set.
3255 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3258 * Return the amount of padding in pixels which the get_buffer callback must
3259 * provide around the edge of the image for codecs which do not have the
3260 * CODEC_FLAG_EMU_EDGE flag.
3262 * @return Required padding in pixels.
3264 unsigned avcodec_get_edge_width(void);
3267 * Modify width and height values so that they will result in a memory
3268 * buffer that is acceptable for the codec if you do not use any horizontal
3271 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3272 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3273 * according to avcodec_get_edge_width() before.
3275 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3278 * Modify width and height values so that they will result in a memory
3279 * buffer that is acceptable for the codec if you also ensure that all
3280 * line sizes are a multiple of the respective linesize_align[i].
3282 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3283 * If CODEC_FLAG_EMU_EDGE is not set, the dimensions must have been increased
3284 * according to avcodec_get_edge_width() before.
3286 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3287 int linesize_align[AV_NUM_DATA_POINTERS]);
3290 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3292 * Some decoders may support multiple frames in a single AVPacket. Such
3293 * decoders would then just decode the first frame. In this case,
3294 * avcodec_decode_audio4 has to be called again with an AVPacket containing
3295 * the remaining data in order to decode the second frame, etc...
3296 * Even if no frames are returned, the packet needs to be fed to the decoder
3297 * with remaining data until it is completely consumed or an error occurs.
3299 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3300 * larger than the actual read bytes because some optimized bitstream
3301 * readers read 32 or 64 bits at once and could read over the end.
3303 * @note You might have to align the input buffer. The alignment requirements
3304 * depend on the CPU and the decoder.
3306 * @param avctx the codec context
3307 * @param[out] frame The AVFrame in which to store decoded audio samples.
3308 * The decoder will allocate a buffer for the decoded frame by
3309 * calling the AVCodecContext.get_buffer2() callback.
3310 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3311 * reference counted and the returned reference belongs to the
3312 * caller. The caller must release the frame using av_frame_unref()
3313 * when the frame is no longer needed. The caller may safely write
3314 * to the frame if av_frame_is_writable() returns 1.
3315 * When AVCodecContext.refcounted_frames is set to 0, the returned
3316 * reference belongs to the decoder and is valid only until the
3317 * next call to this function or until closing the decoder.
3318 * The caller may not write to it.
3319 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3321 * @param[in] avpkt The input AVPacket containing the input buffer.
3322 * At least avpkt->data and avpkt->size should be set. Some
3323 * decoders might also require additional fields to be set.
3324 * @return A negative error code is returned if an error occurred during
3325 * decoding, otherwise the number of bytes consumed from the input
3326 * AVPacket is returned.
3328 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3329 int *got_frame_ptr, AVPacket *avpkt);
3332 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3333 * Some decoders may support multiple frames in a single AVPacket, such
3334 * decoders would then just decode the first frame.
3336 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3337 * the actual read bytes because some optimized bitstream readers read 32 or 64
3338 * bits at once and could read over the end.
3340 * @warning The end of the input buffer buf should be set to 0 to ensure that
3341 * no overreading happens for damaged MPEG streams.
3343 * @note You might have to align the input buffer avpkt->data.
3344 * The alignment requirements depend on the CPU: on some CPUs it isn't
3345 * necessary at all, on others it won't work at all if not aligned and on others
3346 * it will work but it will have an impact on performance.
3348 * In practice, avpkt->data should have 4 byte alignment at minimum.
3350 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3351 * between input and output, these need to be fed with avpkt->data=NULL,
3352 * avpkt->size=0 at the end to return the remaining frames.
3354 * @param avctx the codec context
3355 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3356 * Use av_frame_alloc() to get an AVFrame. The codec will
3357 * allocate memory for the actual bitmap by calling the
3358 * AVCodecContext.get_buffer2() callback.
3359 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3360 * reference counted and the returned reference belongs to the
3361 * caller. The caller must release the frame using av_frame_unref()
3362 * when the frame is no longer needed. The caller may safely write
3363 * to the frame if av_frame_is_writable() returns 1.
3364 * When AVCodecContext.refcounted_frames is set to 0, the returned
3365 * reference belongs to the decoder and is valid only until the
3366 * next call to this function or until closing the decoder. The
3367 * caller may not write to it.
3369 * @param[in] avpkt The input AVpacket containing the input buffer.
3370 * You can create such packet with av_init_packet() and by then setting
3371 * data and size, some decoders might in addition need other fields like
3372 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3374 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3375 * @return On error a negative value is returned, otherwise the number of bytes
3376 * used or zero if no frame could be decompressed.
3378 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3379 int *got_picture_ptr,
3383 * Decode a subtitle message.
3384 * Return a negative value on error, otherwise return the number of bytes used.
3385 * If no subtitle could be decompressed, got_sub_ptr is zero.
3386 * Otherwise, the subtitle is stored in *sub.
3387 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3388 * simplicity, because the performance difference is expect to be negligible
3389 * and reusing a get_buffer written for video codecs would probably perform badly
3390 * due to a potentially very different allocation pattern.
3392 * @param avctx the codec context
3393 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3394 freed with avsubtitle_free if *got_sub_ptr is set.
3395 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3396 * @param[in] avpkt The input AVPacket containing the input buffer.
3398 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3403 * @defgroup lavc_parsing Frame parsing
3407 typedef struct AVCodecParserContext {
3409 struct AVCodecParser *parser;
3410 int64_t frame_offset; /* offset of the current frame */
3411 int64_t cur_offset; /* current offset
3412 (incremented by each av_parser_parse()) */
3413 int64_t next_frame_offset; /* offset of the next frame */
3415 int pict_type; /* XXX: Put it back in AVCodecContext. */
3417 * This field is used for proper frame duration computation in lavf.
3418 * It signals, how much longer the frame duration of the current frame
3419 * is compared to normal frame duration.
3421 * frame_duration = (1 + repeat_pict) * time_base
3423 * It is used by codecs like H.264 to display telecined material.
3425 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3426 int64_t pts; /* pts of the current frame */
3427 int64_t dts; /* dts of the current frame */
3432 int fetch_timestamp;
3434 #define AV_PARSER_PTS_NB 4
3435 int cur_frame_start_index;
3436 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3437 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3438 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3441 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3442 #define PARSER_FLAG_ONCE 0x0002
3443 /// Set if the parser has a valid file offset
3444 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3446 int64_t offset; ///< byte offset from starting packet start
3447 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3450 * Set by parser to 1 for key frames and 0 for non-key frames.
3451 * It is initialized to -1, so if the parser doesn't set this flag,
3452 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3458 * Time difference in stream time base units from the pts of this
3459 * packet to the point at which the output from the decoder has converged
3460 * independent from the availability of previous frames. That is, the
3461 * frames are virtually identical no matter if decoding started from
3462 * the very first frame or from this keyframe.
3463 * Is AV_NOPTS_VALUE if unknown.
3464 * This field is not the display duration of the current frame.
3465 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3468 * The purpose of this field is to allow seeking in streams that have no
3469 * keyframes in the conventional sense. It corresponds to the
3470 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3471 * essential for some types of subtitle streams to ensure that all
3472 * subtitles are correctly displayed after seeking.
3474 int64_t convergence_duration;
3476 // Timestamp generation support:
3478 * Synchronization point for start of timestamp generation.
3480 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3483 * For example, this corresponds to presence of H.264 buffering period
3489 * Offset of the current timestamp against last timestamp sync point in
3490 * units of AVCodecContext.time_base.
3492 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3493 * contain a valid timestamp offset.
3495 * Note that the timestamp of sync point has usually a nonzero
3496 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3497 * the next frame after timestamp sync point will be usually 1.
3499 * For example, this corresponds to H.264 cpb_removal_delay.
3501 int dts_ref_dts_delta;
3504 * Presentation delay of current frame in units of AVCodecContext.time_base.
3506 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3507 * contain valid non-negative timestamp delta (presentation time of a frame
3508 * must not lie in the past).
3510 * This delay represents the difference between decoding and presentation
3511 * time of the frame.
3513 * For example, this corresponds to H.264 dpb_output_delay.
3518 * Position of the packet in file.
3520 * Analogous to cur_frame_pts/dts
3522 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3525 * Byte position of currently parsed frame in stream.
3530 * Previous frame byte position.
3535 * Duration of the current frame.
3536 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3537 * For all other types, this is in units of AVCodecContext.time_base.
3541 enum AVFieldOrder field_order;
3542 } AVCodecParserContext;
3544 typedef struct AVCodecParser {
3545 int codec_ids[5]; /* several codec IDs are permitted */
3547 int (*parser_init)(AVCodecParserContext *s);
3548 int (*parser_parse)(AVCodecParserContext *s,
3549 AVCodecContext *avctx,
3550 const uint8_t **poutbuf, int *poutbuf_size,
3551 const uint8_t *buf, int buf_size);
3552 void (*parser_close)(AVCodecParserContext *s);
3553 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3554 struct AVCodecParser *next;
3557 AVCodecParser *av_parser_next(AVCodecParser *c);
3559 void av_register_codec_parser(AVCodecParser *parser);
3560 AVCodecParserContext *av_parser_init(int codec_id);
3565 * @param s parser context.
3566 * @param avctx codec context.
3567 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3568 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3569 * @param buf input buffer.
3570 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3571 * @param pts input presentation timestamp.
3572 * @param dts input decoding timestamp.
3573 * @param pos input byte position in stream.
3574 * @return the number of bytes of the input bitstream used.
3579 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3586 * decode_frame(data, size);
3590 int av_parser_parse2(AVCodecParserContext *s,
3591 AVCodecContext *avctx,
3592 uint8_t **poutbuf, int *poutbuf_size,
3593 const uint8_t *buf, int buf_size,
3594 int64_t pts, int64_t dts,
3598 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3599 * @deprecated use AVBitstreamFilter
3601 int av_parser_change(AVCodecParserContext *s,
3602 AVCodecContext *avctx,
3603 uint8_t **poutbuf, int *poutbuf_size,
3604 const uint8_t *buf, int buf_size, int keyframe);
3605 void av_parser_close(AVCodecParserContext *s);
3613 * @addtogroup lavc_encoding
3618 * Find a registered encoder with a matching codec ID.
3620 * @param id AVCodecID of the requested encoder
3621 * @return An encoder if one was found, NULL otherwise.
3623 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3626 * Find a registered encoder with the specified name.
3628 * @param name name of the requested encoder
3629 * @return An encoder if one was found, NULL otherwise.
3631 AVCodec *avcodec_find_encoder_by_name(const char *name);
3634 * Encode a frame of audio.
3636 * Takes input samples from frame and writes the next output packet, if
3637 * available, to avpkt. The output packet does not necessarily contain data for
3638 * the most recent frame, as encoders can delay, split, and combine input frames
3639 * internally as needed.
3641 * @param avctx codec context
3642 * @param avpkt output AVPacket.
3643 * The user can supply an output buffer by setting
3644 * avpkt->data and avpkt->size prior to calling the
3645 * function, but if the size of the user-provided data is not
3646 * large enough, encoding will fail. All other AVPacket fields
3647 * will be reset by the encoder using av_init_packet(). If
3648 * avpkt->data is NULL, the encoder will allocate it.
3649 * The encoder will set avpkt->size to the size of the
3652 * If this function fails or produces no output, avpkt will be
3653 * freed using av_free_packet() (i.e. avpkt->destruct will be
3654 * called to free the user supplied buffer).
3655 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3656 * May be NULL when flushing an encoder that has the
3657 * CODEC_CAP_DELAY capability set.
3658 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3659 * can have any number of samples.
3660 * If it is not set, frame->nb_samples must be equal to
3661 * avctx->frame_size for all frames except the last.
3662 * The final frame may be smaller than avctx->frame_size.
3663 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3664 * output packet is non-empty, and to 0 if it is
3665 * empty. If the function returns an error, the
3666 * packet can be assumed to be invalid, and the
3667 * value of got_packet_ptr is undefined and should
3669 * @return 0 on success, negative error code on failure
3671 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3672 const AVFrame *frame, int *got_packet_ptr);
3675 * Encode a frame of video.
3677 * Takes input raw video data from frame and writes the next output packet, if
3678 * available, to avpkt. The output packet does not necessarily contain data for
3679 * the most recent frame, as encoders can delay and reorder input frames
3680 * internally as needed.
3682 * @param avctx codec context
3683 * @param avpkt output AVPacket.
3684 * The user can supply an output buffer by setting
3685 * avpkt->data and avpkt->size prior to calling the
3686 * function, but if the size of the user-provided data is not
3687 * large enough, encoding will fail. All other AVPacket fields
3688 * will be reset by the encoder using av_init_packet(). If
3689 * avpkt->data is NULL, the encoder will allocate it.
3690 * The encoder will set avpkt->size to the size of the
3691 * output packet. The returned data (if any) belongs to the
3692 * caller, he is responsible for freeing it.
3694 * If this function fails or produces no output, avpkt will be
3695 * freed using av_free_packet() (i.e. avpkt->destruct will be
3696 * called to free the user supplied buffer).
3697 * @param[in] frame AVFrame containing the raw video data to be encoded.
3698 * May be NULL when flushing an encoder that has the
3699 * CODEC_CAP_DELAY capability set.
3700 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3701 * output packet is non-empty, and to 0 if it is
3702 * empty. If the function returns an error, the
3703 * packet can be assumed to be invalid, and the
3704 * value of got_packet_ptr is undefined and should
3706 * @return 0 on success, negative error code on failure
3708 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3709 const AVFrame *frame, int *got_packet_ptr);
3711 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3712 const AVSubtitle *sub);
3720 * @addtogroup lavc_picture
3725 * Allocate memory for a picture. Call avpicture_free() to free it.
3727 * @see avpicture_fill()
3729 * @param picture the picture to be filled in
3730 * @param pix_fmt the format of the picture
3731 * @param width the width of the picture
3732 * @param height the height of the picture
3733 * @return zero if successful, a negative value if not
3735 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
3738 * Free a picture previously allocated by avpicture_alloc().
3739 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3742 * @param picture the AVPicture to be freed
3744 void avpicture_free(AVPicture *picture);
3747 * Fill in the AVPicture fields.
3748 * The fields of the given AVPicture are filled in by using the 'ptr' address
3749 * which points to the image data buffer. Depending on the specified picture
3750 * format, one or multiple image data pointers and line sizes will be set.
3751 * If a planar format is specified, several pointers will be set pointing to
3752 * the different picture planes and the line sizes of the different planes
3753 * will be stored in the lines_sizes array.
3754 * Call with ptr == NULL to get the required size for the ptr buffer.
3756 * To allocate the buffer and fill in the AVPicture fields in one call,
3757 * use avpicture_alloc().
3759 * @param picture AVPicture whose fields are to be filled in
3760 * @param ptr Buffer which will contain or contains the actual image data
3761 * @param pix_fmt The format in which the picture data is stored.
3762 * @param width the width of the image in pixels
3763 * @param height the height of the image in pixels
3764 * @return size of the image data in bytes
3766 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3767 enum AVPixelFormat pix_fmt, int width, int height);
3770 * Copy pixel data from an AVPicture into a buffer.
3771 * The data is stored compactly, without any gaps for alignment or padding
3772 * which may be applied by avpicture_fill().
3774 * @see avpicture_get_size()
3776 * @param[in] src AVPicture containing image data
3777 * @param[in] pix_fmt The format in which the picture data is stored.
3778 * @param[in] width the width of the image in pixels.
3779 * @param[in] height the height of the image in pixels.
3780 * @param[out] dest A buffer into which picture data will be copied.
3781 * @param[in] dest_size The size of 'dest'.
3782 * @return The number of bytes written to dest, or a negative value (error code) on error.
3784 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
3785 int width, int height,
3786 unsigned char *dest, int dest_size);
3789 * Calculate the size in bytes that a picture of the given width and height
3790 * would occupy if stored in the given picture format.
3791 * Note that this returns the size of a compact representation as generated
3792 * by avpicture_layout(), which can be smaller than the size required for e.g.
3795 * @param pix_fmt the given picture format
3796 * @param width the width of the image
3797 * @param height the height of the image
3798 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
3800 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
3802 #if FF_API_DEINTERLACE
3804 * deinterlace - if not supported return -1
3806 * @deprecated - use yadif (in libavfilter) instead
3808 attribute_deprecated
3809 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
3810 enum AVPixelFormat pix_fmt, int width, int height);
3813 * Copy image src to dst. Wraps av_picture_data_copy() above.
3815 void av_picture_copy(AVPicture *dst, const AVPicture *src,
3816 enum AVPixelFormat pix_fmt, int width, int height);
3819 * Crop image top and left side.
3821 int av_picture_crop(AVPicture *dst, const AVPicture *src,
3822 enum AVPixelFormat pix_fmt, int top_band, int left_band);
3827 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
3828 int padtop, int padbottom, int padleft, int padright, int *color);
3835 * @defgroup lavc_misc Utility functions
3838 * Miscellaneous utility functions related to both encoding and decoding
3844 * @defgroup lavc_misc_pixfmt Pixel formats
3846 * Functions for working with pixel formats.
3851 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
3854 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
3857 * Return a value representing the fourCC code associated to the
3858 * pixel format pix_fmt, or 0 if no associated fourCC code can be
3861 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
3863 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
3864 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
3865 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
3866 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
3867 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
3868 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
3871 * Compute what kind of losses will occur when converting from one specific
3872 * pixel format to another.
3873 * When converting from one pixel format to another, information loss may occur.
3874 * For example, when converting from RGB24 to GRAY, the color information will
3875 * be lost. Similarly, other losses occur when converting from some formats to
3876 * other formats. These losses can involve loss of chroma, but also loss of
3877 * resolution, loss of color depth, loss due to the color space conversion, loss
3878 * of the alpha bits or loss due to color quantization.
3879 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
3880 * which will occur when converting from one pixel format to another.
3882 * @param[in] dst_pix_fmt destination pixel format
3883 * @param[in] src_pix_fmt source pixel format
3884 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3885 * @return Combination of flags informing you what kind of losses will occur.
3887 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
3891 * Find the best pixel format to convert to given a certain source pixel
3892 * format. When converting from one pixel format to another, information loss
3893 * may occur. For example, when converting from RGB24 to GRAY, the color
3894 * information will be lost. Similarly, other losses occur when converting from
3895 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
3896 * the given pixel formats should be used to suffer the least amount of loss.
3897 * The pixel formats from which it chooses one, are determined by the
3898 * pix_fmt_list parameter.
3901 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
3902 * @param[in] src_pix_fmt source pixel format
3903 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
3904 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
3905 * @return The best pixel format to convert to or -1 if none was found.
3907 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
3908 enum AVPixelFormat src_pix_fmt,
3909 int has_alpha, int *loss_ptr);
3911 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
3917 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
3920 * Put a string representing the codec tag codec_tag in buf.
3922 * @param buf_size size in bytes of buf
3923 * @return the length of the string that would have been generated if
3924 * enough space had been available, excluding the trailing null
3926 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
3928 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
3931 * Return a name for the specified profile, if available.
3933 * @param codec the codec that is searched for the given profile
3934 * @param profile the profile value for which a name is requested
3935 * @return A name for the profile if found, NULL otherwise.
3937 const char *av_get_profile_name(const AVCodec *codec, int profile);
3939 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
3940 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
3941 //FIXME func typedef
3944 * Fill audio frame data and linesize.
3945 * AVFrame extended_data channel pointers are allocated if necessary for
3948 * @param frame the AVFrame
3949 * frame->nb_samples must be set prior to calling the
3950 * function. This function fills in frame->data,
3951 * frame->extended_data, frame->linesize[0].
3952 * @param nb_channels channel count
3953 * @param sample_fmt sample format
3954 * @param buf buffer to use for frame data
3955 * @param buf_size size of buffer
3956 * @param align plane size sample alignment (0 = default)
3957 * @return 0 on success, negative error code on failure
3959 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
3960 enum AVSampleFormat sample_fmt, const uint8_t *buf,
3961 int buf_size, int align);
3964 * Flush buffers, should be called when seeking or when switching to a different stream.
3966 void avcodec_flush_buffers(AVCodecContext *avctx);
3969 * Return codec bits per sample.
3971 * @param[in] codec_id the codec
3972 * @return Number of bits per sample or zero if unknown for the given codec.
3974 int av_get_bits_per_sample(enum AVCodecID codec_id);
3977 * Return codec bits per sample.
3978 * Only return non-zero if the bits per sample is exactly correct, not an
3981 * @param[in] codec_id the codec
3982 * @return Number of bits per sample or zero if unknown for the given codec.
3984 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
3987 * Return audio frame duration.
3989 * @param avctx codec context
3990 * @param frame_bytes size of the frame, or 0 if unknown
3991 * @return frame duration, in samples, if known. 0 if not able to
3994 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
3997 typedef struct AVBitStreamFilterContext {
3999 struct AVBitStreamFilter *filter;
4000 AVCodecParserContext *parser;
4001 struct AVBitStreamFilterContext *next;
4002 } AVBitStreamFilterContext;
4005 typedef struct AVBitStreamFilter {
4008 int (*filter)(AVBitStreamFilterContext *bsfc,
4009 AVCodecContext *avctx, const char *args,
4010 uint8_t **poutbuf, int *poutbuf_size,
4011 const uint8_t *buf, int buf_size, int keyframe);
4012 void (*close)(AVBitStreamFilterContext *bsfc);
4013 struct AVBitStreamFilter *next;
4014 } AVBitStreamFilter;
4016 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4017 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4018 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4019 AVCodecContext *avctx, const char *args,
4020 uint8_t **poutbuf, int *poutbuf_size,
4021 const uint8_t *buf, int buf_size, int keyframe);
4022 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4024 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4029 * Reallocate the given block if it is not large enough, otherwise do nothing.
4033 void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
4036 * Allocate a buffer, reusing the given one if large enough.
4038 * Contrary to av_fast_realloc the current buffer contents might not be
4039 * preserved and on error the old buffer is freed, thus no special
4040 * handling to avoid memleaks is necessary.
4042 * @param ptr pointer to pointer to already allocated buffer, overwritten with pointer to new buffer
4043 * @param size size of the buffer *ptr points to
4044 * @param min_size minimum size of *ptr buffer after returning, *ptr will be NULL and
4045 * *size 0 if an error occurred.
4047 void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
4050 * Allocate a buffer with padding, reusing the given one if large enough.
4052 * Same behaviour av_fast_malloc but the buffer has additional
4053 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4056 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4059 * Encode extradata length to a buffer. Used by xiph codecs.
4061 * @param s buffer to write to; must be at least (v/255+1) bytes long
4062 * @param v size of extradata in bytes
4063 * @return number of bytes written to the buffer.
4065 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4067 #if FF_API_MISSING_SAMPLE
4069 * Log a generic warning message about a missing feature. This function is
4070 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4071 * only, and would normally not be used by applications.
4072 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4073 * a pointer to an AVClass struct
4074 * @param[in] feature string containing the name of the missing feature
4075 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4076 * If want_sample is non-zero, additional verbage will be added to the log
4077 * message which tells the user how to report samples to the development
4079 * @deprecated Use avpriv_report_missing_feature() instead.
4081 attribute_deprecated
4082 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4085 * Log a generic warning message asking for a sample. This function is
4086 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4087 * only, and would normally not be used by applications.
4088 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4089 * a pointer to an AVClass struct
4090 * @param[in] msg string containing an optional message, or NULL if no message
4091 * @deprecated Use avpriv_request_sample() instead.
4093 attribute_deprecated
4094 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4095 #endif /* FF_API_MISSING_SAMPLE */
4098 * Register the hardware accelerator hwaccel.
4100 void av_register_hwaccel(AVHWAccel *hwaccel);
4103 * If hwaccel is NULL, returns the first registered hardware accelerator,
4104 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4105 * after hwaccel, or NULL if hwaccel is the last one.
4107 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4111 * Lock operation used by lockmgr
4114 AV_LOCK_CREATE, ///< Create a mutex
4115 AV_LOCK_OBTAIN, ///< Lock the mutex
4116 AV_LOCK_RELEASE, ///< Unlock the mutex
4117 AV_LOCK_DESTROY, ///< Free mutex resources
4121 * Register a user provided lock manager supporting the operations
4122 * specified by AVLockOp. mutex points to a (void *) where the
4123 * lockmgr should store/get a pointer to a user allocated mutex. It's
4124 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4126 * @param cb User defined callback. Note: Libav may invoke calls to this
4127 * callback during the call to av_lockmgr_register().
4128 * Thus, the application must be prepared to handle that.
4129 * If cb is set to NULL the lockmgr will be unregistered.
4130 * Also note that during unregistration the previously registered
4131 * lockmgr callback may also be invoked.
4133 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4136 * Get the type of the given codec.
4138 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4141 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4142 * with no corresponding avcodec_close()), 0 otherwise.
4144 int avcodec_is_open(AVCodecContext *s);
4147 * @return a non-zero number if codec is an encoder, zero otherwise
4149 int av_codec_is_encoder(const AVCodec *codec);
4152 * @return a non-zero number if codec is a decoder, zero otherwise
4154 int av_codec_is_decoder(const AVCodec *codec);
4157 * @return descriptor for given codec ID or NULL if no descriptor exists.
4159 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4162 * Iterate over all codec descriptors known to libavcodec.
4164 * @param prev previous descriptor. NULL to get the first descriptor.
4166 * @return next descriptor or NULL after the last descriptor
4168 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4171 * @return codec descriptor with the given name or NULL if no such descriptor
4174 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4180 #endif /* AVCODEC_AVCODEC_H */