2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of Libav.
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
27 * Libavcodec external API header
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/frame.h"
38 #include "libavutil/log.h"
39 #include "libavutil/pixfmt.h"
40 #include "libavutil/rational.h"
44 #if FF_API_FAST_MALLOC
45 // to provide fast_*alloc
46 #include "libavutil/mem.h"
50 * @defgroup libavc Encoding/Decoding Library
53 * @defgroup lavc_decoding Decoding
57 * @defgroup lavc_encoding Encoding
61 * @defgroup lavc_codec Codecs
63 * @defgroup lavc_codec_native Native Codecs
66 * @defgroup lavc_codec_wrappers External library wrappers
69 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
73 * @defgroup lavc_internal Internal
81 * @defgroup lavc_core Core functions/structures.
84 * Basic definitions, functions for querying libavcodec capabilities,
85 * allocating core structures, etc.
91 * Identify the syntax and semantics of the bitstream.
92 * The principle is roughly:
93 * Two decoders with the same ID can decode the same streams.
94 * Two encoders with the same ID can encode compatible streams.
95 * There may be slight deviations from the principle due to implementation
98 * If you add a codec ID to this list, add it so that
99 * 1. no value of a existing codec ID changes (that would break ABI),
100 * 2. it is as close as possible to similar codecs.
102 * After adding new codec IDs, do not forget to add an entry to the codec
103 * descriptor list and bump libavcodec minor version.
109 AV_CODEC_ID_MPEG1VIDEO,
110 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
112 AV_CODEC_ID_MPEG2VIDEO_XVMC,
113 #endif /* FF_API_XVMC */
124 AV_CODEC_ID_RAWVIDEO,
125 AV_CODEC_ID_MSMPEG4V1,
126 AV_CODEC_ID_MSMPEG4V2,
127 AV_CODEC_ID_MSMPEG4V3,
150 AV_CODEC_ID_INTERPLAY_VIDEO,
157 AV_CODEC_ID_MSVIDEO1,
162 AV_CODEC_ID_TRUEMOTION1,
163 AV_CODEC_ID_VMDVIDEO,
188 AV_CODEC_ID_TRUEMOTION2,
194 AV_CODEC_ID_SMACKVIDEO,
199 AV_CODEC_ID_JPEG2000,
205 AV_CODEC_ID_DSICINVIDEO,
206 AV_CODEC_ID_TIERTEXSEQVIDEO,
214 AV_CODEC_ID_BETHSOFTVID,
226 AV_CODEC_ID_ESCAPE124,
230 AV_CODEC_ID_MOTIONPIXELS,
242 AV_CODEC_ID_FLASHSV2,
243 AV_CODEC_ID_CDGRAPHICS,
246 AV_CODEC_ID_BINKVIDEO,
247 AV_CODEC_ID_IFF_ILBM,
248 AV_CODEC_ID_IFF_BYTERUN1,
254 AV_CODEC_ID_A64_MULTI,
255 AV_CODEC_ID_A64_MULTI5,
258 AV_CODEC_ID_LAGARITH,
262 AV_CODEC_ID_WMV3IMAGE,
263 AV_CODEC_ID_VC1IMAGE,
265 AV_CODEC_ID_BMV_VIDEO,
272 AV_CODEC_ID_ZEROCODEC,
281 AV_CODEC_ID_ESCAPE130,
284 AV_CODEC_ID_HNM4_VIDEO,
287 AV_CODEC_ID_ALIAS_PIX,
288 AV_CODEC_ID_BRENDER_PIX,
289 AV_CODEC_ID_PAF_VIDEO,
294 /* various PCM "codecs" */
295 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
296 AV_CODEC_ID_PCM_S16LE = 0x10000,
297 AV_CODEC_ID_PCM_S16BE,
298 AV_CODEC_ID_PCM_U16LE,
299 AV_CODEC_ID_PCM_U16BE,
302 AV_CODEC_ID_PCM_MULAW,
303 AV_CODEC_ID_PCM_ALAW,
304 AV_CODEC_ID_PCM_S32LE,
305 AV_CODEC_ID_PCM_S32BE,
306 AV_CODEC_ID_PCM_U32LE,
307 AV_CODEC_ID_PCM_U32BE,
308 AV_CODEC_ID_PCM_S24LE,
309 AV_CODEC_ID_PCM_S24BE,
310 AV_CODEC_ID_PCM_U24LE,
311 AV_CODEC_ID_PCM_U24BE,
312 AV_CODEC_ID_PCM_S24DAUD,
313 AV_CODEC_ID_PCM_ZORK,
314 AV_CODEC_ID_PCM_S16LE_PLANAR,
316 AV_CODEC_ID_PCM_F32BE,
317 AV_CODEC_ID_PCM_F32LE,
318 AV_CODEC_ID_PCM_F64BE,
319 AV_CODEC_ID_PCM_F64LE,
320 AV_CODEC_ID_PCM_BLURAY,
323 AV_CODEC_ID_PCM_S8_PLANAR,
324 AV_CODEC_ID_PCM_S24LE_PLANAR,
325 AV_CODEC_ID_PCM_S32LE_PLANAR,
327 /* various ADPCM codecs */
328 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
329 AV_CODEC_ID_ADPCM_IMA_WAV,
330 AV_CODEC_ID_ADPCM_IMA_DK3,
331 AV_CODEC_ID_ADPCM_IMA_DK4,
332 AV_CODEC_ID_ADPCM_IMA_WS,
333 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
334 AV_CODEC_ID_ADPCM_MS,
335 AV_CODEC_ID_ADPCM_4XM,
336 AV_CODEC_ID_ADPCM_XA,
337 AV_CODEC_ID_ADPCM_ADX,
338 AV_CODEC_ID_ADPCM_EA,
339 AV_CODEC_ID_ADPCM_G726,
340 AV_CODEC_ID_ADPCM_CT,
341 AV_CODEC_ID_ADPCM_SWF,
342 AV_CODEC_ID_ADPCM_YAMAHA,
343 AV_CODEC_ID_ADPCM_SBPRO_4,
344 AV_CODEC_ID_ADPCM_SBPRO_3,
345 AV_CODEC_ID_ADPCM_SBPRO_2,
346 AV_CODEC_ID_ADPCM_THP,
347 AV_CODEC_ID_ADPCM_IMA_AMV,
348 AV_CODEC_ID_ADPCM_EA_R1,
349 AV_CODEC_ID_ADPCM_EA_R3,
350 AV_CODEC_ID_ADPCM_EA_R2,
351 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
352 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
353 AV_CODEC_ID_ADPCM_EA_XAS,
354 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
355 AV_CODEC_ID_ADPCM_IMA_ISS,
356 AV_CODEC_ID_ADPCM_G722,
357 AV_CODEC_ID_ADPCM_IMA_APC,
358 AV_CODEC_ID_ADPCM_VIMA,
361 AV_CODEC_ID_AMR_NB = 0x12000,
364 /* RealAudio codecs*/
365 AV_CODEC_ID_RA_144 = 0x13000,
368 /* various DPCM codecs */
369 AV_CODEC_ID_ROQ_DPCM = 0x14000,
370 AV_CODEC_ID_INTERPLAY_DPCM,
371 AV_CODEC_ID_XAN_DPCM,
372 AV_CODEC_ID_SOL_DPCM,
375 AV_CODEC_ID_MP2 = 0x15000,
376 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
386 AV_CODEC_ID_VMDAUDIO,
392 AV_CODEC_ID_WESTWOOD_SND1,
393 AV_CODEC_ID_GSM, ///< as in Berlin toast format
396 AV_CODEC_ID_TRUESPEECH,
398 AV_CODEC_ID_SMACKAUDIO,
401 AV_CODEC_ID_DSICINAUDIO,
403 AV_CODEC_ID_MUSEPACK7,
405 AV_CODEC_ID_GSM_MS, /* as found in WAV */
411 AV_CODEC_ID_NELLYMOSER,
412 AV_CODEC_ID_MUSEPACK8,
414 AV_CODEC_ID_WMAVOICE,
416 AV_CODEC_ID_WMALOSSLESS,
425 AV_CODEC_ID_BINKAUDIO_RDFT,
426 AV_CODEC_ID_BINKAUDIO_DCT,
427 AV_CODEC_ID_AAC_LATM,
432 AV_CODEC_ID_8SVX_EXP,
433 AV_CODEC_ID_8SVX_FIB,
434 AV_CODEC_ID_BMV_AUDIO,
439 AV_CODEC_ID_COMFORT_NOISE,
441 AV_CODEC_ID_METASOUND,
442 AV_CODEC_ID_PAF_AUDIO,
444 /* subtitle codecs */
445 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
446 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
447 AV_CODEC_ID_DVB_SUBTITLE,
448 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
451 AV_CODEC_ID_MOV_TEXT,
452 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
453 AV_CODEC_ID_DVB_TELETEXT,
456 /* other specific kind of codecs (generally used for attachments) */
457 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
458 AV_CODEC_ID_TTF = 0x18000,
460 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
462 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
463 * stream (only used by libavformat) */
464 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
465 * stream (only used by libavformat) */
466 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
470 * This struct describes the properties of a single codec described by an
472 * @see avcodec_get_descriptor()
474 typedef struct AVCodecDescriptor {
476 enum AVMediaType type;
478 * Name of the codec described by this descriptor. It is non-empty and
479 * unique for each codec descriptor. It should contain alphanumeric
480 * characters and '_' only.
484 * A more descriptive name for this codec. May be NULL.
486 const char *long_name;
488 * Codec properties, a combination of AV_CODEC_PROP_* flags.
494 * Codec uses only intra compression.
497 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
499 * Codec supports lossy compression. Audio and video codecs only.
500 * @note a codec may support both lossy and lossless
503 #define AV_CODEC_PROP_LOSSY (1 << 1)
505 * Codec supports lossless compression. Audio and video codecs only.
507 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
510 * @ingroup lavc_decoding
511 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
512 * This is mainly needed because some optimized bitstream readers read
513 * 32 or 64 bit at once and could read over the end.<br>
514 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
515 * MPEG bitstreams could cause overread and segfault.
517 #define FF_INPUT_BUFFER_PADDING_SIZE 8
520 * @ingroup lavc_encoding
521 * minimum encoding buffer size
522 * Used to avoid some checks during header writing.
524 #define FF_MIN_BUFFER_SIZE 16384
528 * @ingroup lavc_encoding
529 * motion estimation type.
532 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
536 ME_EPZS, ///< enhanced predictive zonal search
537 ME_X1, ///< reserved for experiments
538 ME_HEX, ///< hexagon based search
539 ME_UMH, ///< uneven multi-hexagon search
540 ME_TESA, ///< transformed exhaustive search algorithm
544 * @ingroup lavc_decoding
547 /* We leave some space between them for extensions (drop some
548 * keyframes for intra-only or drop just some bidir frames). */
549 AVDISCARD_NONE =-16, ///< discard nothing
550 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
551 AVDISCARD_NONREF = 8, ///< discard all non reference
552 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
553 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
554 AVDISCARD_ALL = 48, ///< discard all
557 enum AVColorPrimaries{
558 AVCOL_PRI_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 / SMPTE RP177 Annex B
559 AVCOL_PRI_UNSPECIFIED = 2,
560 AVCOL_PRI_BT470M = 4,
561 AVCOL_PRI_BT470BG = 5, ///< also ITU-R BT601-6 625 / ITU-R BT1358 625 / ITU-R BT1700 625 PAL & SECAM
562 AVCOL_PRI_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC
563 AVCOL_PRI_SMPTE240M = 7, ///< functionally identical to above
565 AVCOL_PRI_BT2020 = 9, ///< ITU-R BT2020
566 AVCOL_PRI_NB , ///< Not part of ABI
569 enum AVColorTransferCharacteristic{
570 AVCOL_TRC_BT709 = 1, ///< also ITU-R BT1361
571 AVCOL_TRC_UNSPECIFIED = 2,
572 AVCOL_TRC_GAMMA22 = 4, ///< also ITU-R BT470M / ITU-R BT1700 625 PAL & SECAM
573 AVCOL_TRC_GAMMA28 = 5, ///< also ITU-R BT470BG
574 AVCOL_TRC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 or 625 / ITU-R BT1358 525 or 625 / ITU-R BT1700 NTSC
575 AVCOL_TRC_SMPTE240M = 7,
576 AVCOL_TRC_LINEAR = 8, ///< "Linear transfer characteristics"
577 AVCOL_TRC_LOG = 9, ///< "Logarithmic transfer characteristic (100:1 range)"
578 AVCOL_TRC_LOG_SQRT = 10, ///< "Logarithmic transfer characteristic (100 * Sqrt( 10 ) : 1 range)"
579 AVCOL_TRC_IEC61966_2_4 = 11, ///< IEC 61966-2-4
580 AVCOL_TRC_BT1361_ECG = 12, ///< ITU-R BT1361 Extended Colour Gamut
581 AVCOL_TRC_IEC61966_2_1 = 13, ///< IEC 61966-2-1 (sRGB or sYCC)
582 AVCOL_TRC_BT2020_10 = 14, ///< ITU-R BT2020 for 10 bit system
583 AVCOL_TRC_BT2020_12 = 15, ///< ITU-R BT2020 for 12 bit system
584 AVCOL_TRC_NB , ///< Not part of ABI
589 AVCOL_SPC_BT709 = 1, ///< also ITU-R BT1361 / IEC 61966-2-4 xvYCC709 / SMPTE RP177 Annex B
590 AVCOL_SPC_UNSPECIFIED = 2,
592 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
593 AVCOL_SPC_SMPTE170M = 6, ///< also ITU-R BT601-6 525 / ITU-R BT1358 525 / ITU-R BT1700 NTSC / functionally identical to above
594 AVCOL_SPC_SMPTE240M = 7,
595 AVCOL_SPC_YCOCG = 8, ///< Used by Dirac / VC-2 and H.264 FRext, see ITU-T SG16
596 AVCOL_SPC_BT2020_NCL = 9, ///< ITU-R BT2020 non-constant luminance system
597 AVCOL_SPC_BT2020_CL = 10, ///< ITU-R BT2020 constant luminance system
598 AVCOL_SPC_NB , ///< Not part of ABI
602 AVCOL_RANGE_UNSPECIFIED = 0,
603 AVCOL_RANGE_MPEG = 1, ///< the normal 219*2^(n-8) "MPEG" YUV ranges
604 AVCOL_RANGE_JPEG = 2, ///< the normal 2^n-1 "JPEG" YUV ranges
605 AVCOL_RANGE_NB , ///< Not part of ABI
609 * X X 3 4 X X are luma samples,
610 * 1 2 1-6 are possible chroma positions
611 * X X 5 6 X 0 is undefined/unknown position
613 enum AVChromaLocation{
614 AVCHROMA_LOC_UNSPECIFIED = 0,
615 AVCHROMA_LOC_LEFT = 1, ///< mpeg2/4, h264 default
616 AVCHROMA_LOC_CENTER = 2, ///< mpeg1, jpeg, h263
617 AVCHROMA_LOC_TOPLEFT = 3, ///< DV
618 AVCHROMA_LOC_TOP = 4,
619 AVCHROMA_LOC_BOTTOMLEFT = 5,
620 AVCHROMA_LOC_BOTTOM = 6,
621 AVCHROMA_LOC_NB , ///< Not part of ABI
624 enum AVAudioServiceType {
625 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
626 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
627 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
628 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
629 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
630 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
631 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
632 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
633 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
634 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
638 * @ingroup lavc_encoding
640 typedef struct RcOverride{
643 int qscale; // If this is 0 then quality_factor will be used instead.
644 float quality_factor;
647 #if FF_API_MAX_BFRAMES
649 * @deprecated there is no libavcodec-wide limit on the number of B-frames
651 #define FF_MAX_B_FRAMES 16
655 These flags can be passed in AVCodecContext.flags before initialization.
656 Note: Not everything is supported yet.
660 * Allow decoders to produce frames with data planes that are not aligned
661 * to CPU requirements (e.g. due to cropping).
663 #define CODEC_FLAG_UNALIGNED 0x0001
664 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
665 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
666 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
667 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
668 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
669 #define CODEC_FLAG_MV0 0x0040 ///< Always try a MB with MV=<0,0>.
671 * The parent program guarantees that the input for B-frames containing
672 * streams is not written to for at least s->max_b_frames+1 frames, if
673 * this is not set the input will be copied.
675 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
676 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
677 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
678 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
681 * @deprecated edges are not used/required anymore. I.e. this flag is now always
684 #define CODEC_FLAG_EMU_EDGE 0x4000
686 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
687 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
688 location instead of only at frame boundaries. */
689 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000 ///< Normalize adaptive quantization.
690 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
691 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
692 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
693 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
694 /* Fx : Flag for h263+ extra options */
695 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
696 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
697 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
698 #define CODEC_FLAG_CLOSED_GOP 0x80000000
699 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
700 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
701 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
702 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
704 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
706 /* Unsupported options :
707 * Syntax Arithmetic coding (SAC)
708 * Reference Picture Selection
709 * Independent Segment Decoding */
711 /* codec capabilities */
713 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
715 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
716 * If not set, it might not use get_buffer() at all or use operations that
717 * assume the buffer was allocated by avcodec_default_get_buffer.
719 #define CODEC_CAP_DR1 0x0002
720 #define CODEC_CAP_TRUNCATED 0x0008
722 /* Codec can export data for HW decoding (XvMC). */
723 #define CODEC_CAP_HWACCEL 0x0010
724 #endif /* FF_API_XVMC */
726 * Encoder or decoder requires flushing with NULL input at the end in order to
727 * give the complete and correct output.
729 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
730 * with NULL data. The user can still send NULL data to the public encode
731 * or decode function, but libavcodec will not pass it along to the codec
732 * unless this flag is set.
735 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
736 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
740 * The encoder needs to be fed with NULL data at the end of encoding until the
741 * encoder no longer returns data.
743 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
744 * flag also means that the encoder must set the pts and duration for
745 * each output packet. If this flag is not set, the pts and duration will
746 * be determined by libavcodec from the input frame.
748 #define CODEC_CAP_DELAY 0x0020
750 * Codec can be fed a final frame with a smaller size.
751 * This can be used to prevent truncation of the last audio samples.
753 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
756 * Codec can export data for HW decoding (VDPAU).
758 #define CODEC_CAP_HWACCEL_VDPAU 0x0080
761 * Codec can output multiple frames per AVPacket
762 * Normally demuxers return one frame at a time, demuxers which do not do
763 * are connected to a parser to split what they return into proper frames.
764 * This flag is reserved to the very rare category of codecs which have a
765 * bitstream that cannot be split into frames without timeconsuming
766 * operations like full decoding. Demuxers carring such bitstreams thus
767 * may return multiple frames in a packet. This has many disadvantages like
768 * prohibiting stream copy in many cases thus it should only be considered
771 #define CODEC_CAP_SUBFRAMES 0x0100
773 * Codec is experimental and is thus avoided in favor of non experimental
776 #define CODEC_CAP_EXPERIMENTAL 0x0200
778 * Codec should fill in channel configuration and samplerate instead of container
780 #define CODEC_CAP_CHANNEL_CONF 0x0400
781 #if FF_API_NEG_LINESIZES
783 * @deprecated no codecs use this capability
785 #define CODEC_CAP_NEG_LINESIZES 0x0800
788 * Codec supports frame-level multithreading.
790 #define CODEC_CAP_FRAME_THREADS 0x1000
792 * Codec supports slice-based (or partition-based) multithreading.
794 #define CODEC_CAP_SLICE_THREADS 0x2000
796 * Codec supports changed parameters at any point.
798 #define CODEC_CAP_PARAM_CHANGE 0x4000
800 * Codec supports avctx->thread_count == 0 (auto).
802 #define CODEC_CAP_AUTO_THREADS 0x8000
804 * Audio encoder supports receiving a different number of samples in each call.
806 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
809 //The following defines may change, don't expect compatibility if you use them.
810 #define MB_TYPE_INTRA4x4 0x0001
811 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
812 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
813 #define MB_TYPE_16x16 0x0008
814 #define MB_TYPE_16x8 0x0010
815 #define MB_TYPE_8x16 0x0020
816 #define MB_TYPE_8x8 0x0040
817 #define MB_TYPE_INTERLACED 0x0080
818 #define MB_TYPE_DIRECT2 0x0100 //FIXME
819 #define MB_TYPE_ACPRED 0x0200
820 #define MB_TYPE_GMC 0x0400
821 #define MB_TYPE_SKIP 0x0800
822 #define MB_TYPE_P0L0 0x1000
823 #define MB_TYPE_P1L0 0x2000
824 #define MB_TYPE_P0L1 0x4000
825 #define MB_TYPE_P1L1 0x8000
826 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
827 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
828 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
829 #define MB_TYPE_QUANT 0x00010000
830 #define MB_TYPE_CBP 0x00020000
831 //Note bits 24-31 are reserved for codec specific use (h264 ref0, mpeg1 0mv, ...)
836 * This specifies the area which should be displayed.
837 * Note there may be multiple such areas for one frame.
839 typedef struct AVPanScan{
842 * - encoding: Set by user.
843 * - decoding: Set by libavcodec.
848 * width and height in 1/16 pel
849 * - encoding: Set by user.
850 * - decoding: Set by libavcodec.
856 * position of the top left corner in 1/16 pel for up to 3 fields/frames
857 * - encoding: Set by user.
858 * - decoding: Set by libavcodec.
860 int16_t position[3][2];
863 #if FF_API_QSCALE_TYPE
864 #define FF_QSCALE_TYPE_MPEG1 0
865 #define FF_QSCALE_TYPE_MPEG2 1
866 #define FF_QSCALE_TYPE_H264 2
867 #define FF_QSCALE_TYPE_VP56 3
870 #if FF_API_GET_BUFFER
871 #define FF_BUFFER_TYPE_INTERNAL 1
872 #define FF_BUFFER_TYPE_USER 2 ///< direct rendering buffers (image is (de)allocated by user)
873 #define FF_BUFFER_TYPE_SHARED 4 ///< Buffer from somewhere else; don't deallocate image (data/base), all other tables are not shared.
874 #define FF_BUFFER_TYPE_COPY 8 ///< Just a (modified) copy of some other buffer, don't deallocate anything.
876 #define FF_BUFFER_HINTS_VALID 0x01 // Buffer hints value is meaningful (if 0 ignore).
877 #define FF_BUFFER_HINTS_READABLE 0x02 // Codec will read from buffer.
878 #define FF_BUFFER_HINTS_PRESERVE 0x04 // User must not alter buffer content.
879 #define FF_BUFFER_HINTS_REUSABLE 0x08 // Codec will reuse the buffer (update).
883 * The decoder will keep a reference to the frame and may reuse it later.
885 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
888 * @defgroup lavc_packet AVPacket
890 * Types and functions for working with AVPacket.
893 enum AVPacketSideDataType {
895 AV_PKT_DATA_NEW_EXTRADATA,
898 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
901 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
902 * s32le channel_count
903 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
904 * u64le channel_layout
905 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
907 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
912 AV_PKT_DATA_PARAM_CHANGE,
915 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
916 * structures with info about macroblocks relevant to splitting the
917 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
918 * That is, it does not necessarily contain info about all macroblocks,
919 * as long as the distance between macroblocks in the info is smaller
920 * than the target payload size.
921 * Each MB info structure is 12 bytes, and is laid out as follows:
923 * u32le bit offset from the start of the packet
924 * u8 current quantizer at the start of the macroblock
926 * u16le macroblock address within the GOB
927 * u8 horizontal MV predictor
928 * u8 vertical MV predictor
929 * u8 horizontal MV predictor for block number 3
930 * u8 vertical MV predictor for block number 3
933 AV_PKT_DATA_H263_MB_INFO,
936 * This side data should be associated with an audio stream and contains
937 * ReplayGain information in form of the AVReplayGain struct.
939 AV_PKT_DATA_REPLAYGAIN,
942 typedef struct AVPacketSideData {
945 enum AVPacketSideDataType type;
949 * This structure stores compressed data. It is typically exported by demuxers
950 * and then passed as input to decoders, or received as output from encoders and
951 * then passed to muxers.
953 * For video, it should typically contain one compressed frame. For audio it may
954 * contain several compressed frames.
956 * AVPacket is one of the few structs in Libav, whose size is a part of public
957 * ABI. Thus it may be allocated on stack and no new fields can be added to it
958 * without libavcodec and libavformat major bump.
960 * The semantics of data ownership depends on the buf or destruct (deprecated)
961 * fields. If either is set, the packet data is dynamically allocated and is
962 * valid indefinitely until av_free_packet() is called (which in turn calls
963 * av_buffer_unref()/the destruct callback to free the data). If neither is set,
964 * the packet data is typically backed by some static buffer somewhere and is
965 * only valid for a limited time (e.g. until the next read call when demuxing).
967 * The side data is always allocated with av_malloc() and is freed in
970 typedef struct AVPacket {
972 * A reference to the reference-counted buffer where the packet data is
974 * May be NULL, then the packet data is not reference-counted.
978 * Presentation timestamp in AVStream->time_base units; the time at which
979 * the decompressed packet will be presented to the user.
980 * Can be AV_NOPTS_VALUE if it is not stored in the file.
981 * pts MUST be larger or equal to dts as presentation cannot happen before
982 * decompression, unless one wants to view hex dumps. Some formats misuse
983 * the terms dts and pts/cts to mean something different. Such timestamps
984 * must be converted to true pts/dts before they are stored in AVPacket.
988 * Decompression timestamp in AVStream->time_base units; the time at which
989 * the packet is decompressed.
990 * Can be AV_NOPTS_VALUE if it is not stored in the file.
997 * A combination of AV_PKT_FLAG values
1001 * Additional packet data that can be provided by the container.
1002 * Packet can contain several types of side information.
1004 AVPacketSideData *side_data;
1005 int side_data_elems;
1008 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1009 * Equals next_pts - this_pts in presentation order.
1012 #if FF_API_DESTRUCT_PACKET
1013 attribute_deprecated
1014 void (*destruct)(struct AVPacket *);
1015 attribute_deprecated
1018 int64_t pos; ///< byte position in stream, -1 if unknown
1021 * Time difference in AVStream->time_base units from the pts of this
1022 * packet to the point at which the output from the decoder has converged
1023 * independent from the availability of previous frames. That is, the
1024 * frames are virtually identical no matter if decoding started from
1025 * the very first frame or from this keyframe.
1026 * Is AV_NOPTS_VALUE if unknown.
1027 * This field is not the display duration of the current packet.
1028 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
1031 * The purpose of this field is to allow seeking in streams that have no
1032 * keyframes in the conventional sense. It corresponds to the
1033 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
1034 * essential for some types of subtitle streams to ensure that all
1035 * subtitles are correctly displayed after seeking.
1037 int64_t convergence_duration;
1039 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1040 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1042 enum AVSideDataParamChangeFlags {
1043 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1044 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1045 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1046 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1052 struct AVCodecInternal;
1056 AV_FIELD_PROGRESSIVE,
1057 AV_FIELD_TT, //< Top coded_first, top displayed first
1058 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1059 AV_FIELD_TB, //< Top coded first, bottom displayed first
1060 AV_FIELD_BT, //< Bottom coded first, top displayed first
1064 * main external API structure.
1065 * New fields can be added to the end with minor version bumps.
1066 * Removal, reordering and changes to existing fields require a major
1068 * sizeof(AVCodecContext) must not be used outside libav*.
1070 typedef struct AVCodecContext {
1072 * information on struct for av_log
1073 * - set by avcodec_alloc_context3
1075 const AVClass *av_class;
1076 int log_level_offset;
1078 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1079 const struct AVCodec *codec;
1080 char codec_name[32];
1081 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1084 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1085 * This is used to work around some encoder bugs.
1086 * A demuxer should set this to what is stored in the field used to identify the codec.
1087 * If there are multiple such fields in a container then the demuxer should choose the one
1088 * which maximizes the information about the used codec.
1089 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1090 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1091 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1093 * - encoding: Set by user, if not then the default based on codec_id will be used.
1094 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1096 unsigned int codec_tag;
1099 * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1100 * This is used to work around some encoder bugs.
1101 * - encoding: unused
1102 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1104 unsigned int stream_codec_tag;
1109 * Private context used for internal data.
1111 * Unlike priv_data, this is not codec-specific. It is used in general
1112 * libavcodec functions.
1114 struct AVCodecInternal *internal;
1117 * Private data of the user, can be used to carry app specific stuff.
1118 * - encoding: Set by user.
1119 * - decoding: Set by user.
1124 * the average bitrate
1125 * - encoding: Set by user; unused for constant quantizer encoding.
1126 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1131 * number of bits the bitstream is allowed to diverge from the reference.
1132 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1133 * - encoding: Set by user; unused for constant quantizer encoding.
1134 * - decoding: unused
1136 int bit_rate_tolerance;
1139 * Global quality for codecs which cannot change it per frame.
1140 * This should be proportional to MPEG-1/2/4 qscale.
1141 * - encoding: Set by user.
1142 * - decoding: unused
1147 * - encoding: Set by user.
1148 * - decoding: unused
1150 int compression_level;
1151 #define FF_COMPRESSION_DEFAULT -1
1155 * - encoding: Set by user.
1156 * - decoding: Set by user.
1162 * - encoding: Set by user.
1163 * - decoding: Set by user.
1168 * some codecs need / can use extradata like Huffman tables.
1169 * mjpeg: Huffman tables
1170 * rv10: additional flags
1171 * mpeg4: global headers (they can be in the bitstream or here)
1172 * The allocated memory should be FF_INPUT_BUFFER_PADDING_SIZE bytes larger
1173 * than extradata_size to avoid prolems if it is read with the bitstream reader.
1174 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1175 * - encoding: Set/allocated/freed by libavcodec.
1176 * - decoding: Set/allocated/freed by user.
1182 * This is the fundamental unit of time (in seconds) in terms
1183 * of which frame timestamps are represented. For fixed-fps content,
1184 * timebase should be 1/framerate and timestamp increments should be
1186 * - encoding: MUST be set by user.
1187 * - decoding: Set by libavcodec.
1189 AVRational time_base;
1192 * For some codecs, the time base is closer to the field rate than the frame rate.
1193 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1194 * if no telecine is used ...
1196 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1198 int ticks_per_frame;
1204 * Number of frames the decoded output will be delayed relative to the
1208 * For encoding, this is the number of "priming" samples added to the
1209 * beginning of the stream. The decoded output will be delayed by this
1210 * many samples relative to the input to the encoder. Note that this
1211 * field is purely informational and does not directly affect the pts
1212 * output by the encoder, which should always be based on the actual
1213 * presentation time, including any delay.
1214 * For decoding, this is the number of samples the decoder needs to
1215 * output before the decoder's output is valid. When seeking, you should
1216 * start decoding this many samples prior to your desired seek point.
1218 * - encoding: Set by libavcodec.
1219 * - decoding: Set by libavcodec.
1226 * picture width / height.
1227 * - encoding: MUST be set by user.
1228 * - decoding: May be set by the user before opening the decoder if known e.g.
1229 * from the container. Some decoders will require the dimensions
1230 * to be set by the caller. During decoding, the decoder may
1231 * overwrite those values as required.
1236 * Bitstream width / height, may be different from width/height e.g. when
1237 * the decoded frame is cropped before being output.
1238 * - encoding: unused
1239 * - decoding: May be set by the user before opening the decoder if known
1240 * e.g. from the container. During decoding, the decoder may
1241 * overwrite those values as required.
1243 int coded_width, coded_height;
1245 #if FF_API_ASPECT_EXTENDED
1246 #define FF_ASPECT_EXTENDED 15
1250 * the number of pictures in a group of pictures, or 0 for intra_only
1251 * - encoding: Set by user.
1252 * - decoding: unused
1257 * Pixel format, see AV_PIX_FMT_xxx.
1258 * May be set by the demuxer if known from headers.
1259 * May be overriden by the decoder if it knows better.
1260 * - encoding: Set by user.
1261 * - decoding: Set by user if known, overridden by libavcodec if known
1263 enum AVPixelFormat pix_fmt;
1266 * Motion estimation algorithm used for video coding.
1267 * 1 (zero), 2 (full), 3 (log), 4 (phods), 5 (epzs), 6 (x1), 7 (hex),
1268 * 8 (umh), 10 (tesa) [7, 8, 10 are x264 specific]
1269 * - encoding: MUST be set by user.
1270 * - decoding: unused
1275 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1276 * decoder to draw a horizontal band. It improves cache usage. Not
1277 * all codecs can do that. You must check the codec capabilities
1279 * When multithreading is used, it may be called from multiple threads
1280 * at the same time; threads might draw different parts of the same AVFrame,
1281 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1283 * The function is also used by hardware acceleration APIs.
1284 * It is called at least once during frame decoding to pass
1285 * the data needed for hardware render.
1286 * In that mode instead of pixel data, AVFrame points to
1287 * a structure specific to the acceleration API. The application
1288 * reads the structure and can change some fields to indicate progress
1290 * - encoding: unused
1291 * - decoding: Set by user.
1292 * @param height the height of the slice
1293 * @param y the y position of the slice
1294 * @param type 1->top field, 2->bottom field, 3->frame
1295 * @param offset offset into the AVFrame.data from which the slice should be read
1297 void (*draw_horiz_band)(struct AVCodecContext *s,
1298 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1299 int y, int type, int height);
1302 * callback to negotiate the pixelFormat
1303 * @param fmt is the list of formats which are supported by the codec,
1304 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1305 * The first is always the native one.
1306 * @return the chosen format
1307 * - encoding: unused
1308 * - decoding: Set by user, if not set the native format will be chosen.
1310 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1313 * maximum number of B-frames between non-B-frames
1314 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1315 * - encoding: Set by user.
1316 * - decoding: unused
1321 * qscale factor between IP and B-frames
1322 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1323 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1324 * - encoding: Set by user.
1325 * - decoding: unused
1327 float b_quant_factor;
1329 /** obsolete FIXME remove */
1331 #define FF_RC_STRATEGY_XVID 1
1333 int b_frame_strategy;
1336 * qscale offset between IP and B-frames
1337 * - encoding: Set by user.
1338 * - decoding: unused
1340 float b_quant_offset;
1343 * Size of the frame reordering buffer in the decoder.
1344 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1345 * - encoding: Set by libavcodec.
1346 * - decoding: Set by libavcodec.
1351 * 0-> h263 quant 1-> mpeg quant
1352 * - encoding: Set by user.
1353 * - decoding: unused
1358 * qscale factor between P and I-frames
1359 * If > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset).
1360 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1361 * - encoding: Set by user.
1362 * - decoding: unused
1364 float i_quant_factor;
1367 * qscale offset between P and I-frames
1368 * - encoding: Set by user.
1369 * - decoding: unused
1371 float i_quant_offset;
1374 * luminance masking (0-> disabled)
1375 * - encoding: Set by user.
1376 * - decoding: unused
1381 * temporary complexity masking (0-> disabled)
1382 * - encoding: Set by user.
1383 * - decoding: unused
1385 float temporal_cplx_masking;
1388 * spatial complexity masking (0-> disabled)
1389 * - encoding: Set by user.
1390 * - decoding: unused
1392 float spatial_cplx_masking;
1395 * p block masking (0-> disabled)
1396 * - encoding: Set by user.
1397 * - decoding: unused
1402 * darkness masking (0-> disabled)
1403 * - encoding: Set by user.
1404 * - decoding: unused
1410 * - encoding: Set by libavcodec.
1411 * - decoding: Set by user (or 0).
1415 * prediction method (needed for huffyuv)
1416 * - encoding: Set by user.
1417 * - decoding: unused
1419 int prediction_method;
1420 #define FF_PRED_LEFT 0
1421 #define FF_PRED_PLANE 1
1422 #define FF_PRED_MEDIAN 2
1425 * slice offsets in the frame in bytes
1426 * - encoding: Set/allocated by libavcodec.
1427 * - decoding: Set/allocated by user (or NULL).
1432 * sample aspect ratio (0 if unknown)
1433 * That is the width of a pixel divided by the height of the pixel.
1434 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1435 * - encoding: Set by user.
1436 * - decoding: Set by libavcodec.
1438 AVRational sample_aspect_ratio;
1441 * motion estimation comparison function
1442 * - encoding: Set by user.
1443 * - decoding: unused
1447 * subpixel motion estimation comparison function
1448 * - encoding: Set by user.
1449 * - decoding: unused
1453 * macroblock comparison function (not supported yet)
1454 * - encoding: Set by user.
1455 * - decoding: unused
1459 * interlaced DCT comparison function
1460 * - encoding: Set by user.
1461 * - decoding: unused
1464 #define FF_CMP_SAD 0
1465 #define FF_CMP_SSE 1
1466 #define FF_CMP_SATD 2
1467 #define FF_CMP_DCT 3
1468 #define FF_CMP_PSNR 4
1469 #define FF_CMP_BIT 5
1471 #define FF_CMP_ZERO 7
1472 #define FF_CMP_VSAD 8
1473 #define FF_CMP_VSSE 9
1474 #define FF_CMP_NSSE 10
1475 #define FF_CMP_DCTMAX 13
1476 #define FF_CMP_DCT264 14
1477 #define FF_CMP_CHROMA 256
1480 * ME diamond size & shape
1481 * - encoding: Set by user.
1482 * - decoding: unused
1487 * amount of previous MV predictors (2a+1 x 2a+1 square)
1488 * - encoding: Set by user.
1489 * - decoding: unused
1491 int last_predictor_count;
1494 * prepass for motion estimation
1495 * - encoding: Set by user.
1496 * - decoding: unused
1501 * motion estimation prepass comparison function
1502 * - encoding: Set by user.
1503 * - decoding: unused
1508 * ME prepass diamond size & shape
1509 * - encoding: Set by user.
1510 * - decoding: unused
1516 * - encoding: Set by user.
1517 * - decoding: unused
1519 int me_subpel_quality;
1522 * DTG active format information (additional aspect ratio
1523 * information only used in DVB MPEG-2 transport streams)
1526 * - encoding: unused
1527 * - decoding: Set by decoder.
1529 int dtg_active_format;
1530 #define FF_DTG_AFD_SAME 8
1531 #define FF_DTG_AFD_4_3 9
1532 #define FF_DTG_AFD_16_9 10
1533 #define FF_DTG_AFD_14_9 11
1534 #define FF_DTG_AFD_4_3_SP_14_9 13
1535 #define FF_DTG_AFD_16_9_SP_14_9 14
1536 #define FF_DTG_AFD_SP_4_3 15
1539 * maximum motion estimation search range in subpel units
1540 * If 0 then no limit.
1542 * - encoding: Set by user.
1543 * - decoding: unused
1548 * intra quantizer bias
1549 * - encoding: Set by user.
1550 * - decoding: unused
1552 int intra_quant_bias;
1553 #define FF_DEFAULT_QUANT_BIAS 999999
1556 * inter quantizer bias
1557 * - encoding: Set by user.
1558 * - decoding: unused
1560 int inter_quant_bias;
1564 * - encoding: unused
1565 * - decoding: Set by user.
1568 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1569 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
1570 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1574 * XVideo Motion Acceleration
1575 * - encoding: forbidden
1576 * - decoding: set by decoder
1577 * @deprecated XvMC support is slated for removal.
1579 attribute_deprecated int xvmc_acceleration;
1580 #endif /* FF_API_XVMC */
1583 * macroblock decision mode
1584 * - encoding: Set by user.
1585 * - decoding: unused
1588 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1589 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1590 #define FF_MB_DECISION_RD 2 ///< rate distortion
1593 * custom intra quantization matrix
1594 * - encoding: Set by user, can be NULL.
1595 * - decoding: Set by libavcodec.
1597 uint16_t *intra_matrix;
1600 * custom inter quantization matrix
1601 * - encoding: Set by user, can be NULL.
1602 * - decoding: Set by libavcodec.
1604 uint16_t *inter_matrix;
1607 * scene change detection threshold
1608 * 0 is default, larger means fewer detected scene changes.
1609 * - encoding: Set by user.
1610 * - decoding: unused
1612 int scenechange_threshold;
1615 * noise reduction strength
1616 * - encoding: Set by user.
1617 * - decoding: unused
1619 int noise_reduction;
1622 * Motion estimation threshold below which no motion estimation is
1623 * performed, but instead the user specified motion vectors are used.
1625 * - encoding: Set by user.
1626 * - decoding: unused
1631 * Macroblock threshold below which the user specified macroblock types will be used.
1632 * - encoding: Set by user.
1633 * - decoding: unused
1638 * precision of the intra DC coefficient - 8
1639 * - encoding: Set by user.
1640 * - decoding: unused
1642 int intra_dc_precision;
1645 * Number of macroblock rows at the top which are skipped.
1646 * - encoding: unused
1647 * - decoding: Set by user.
1652 * Number of macroblock rows at the bottom which are skipped.
1653 * - encoding: unused
1654 * - decoding: Set by user.
1659 * Border processing masking, raises the quantizer for mbs on the borders
1661 * - encoding: Set by user.
1662 * - decoding: unused
1664 float border_masking;
1667 * minimum MB lagrange multipler
1668 * - encoding: Set by user.
1669 * - decoding: unused
1674 * maximum MB lagrange multipler
1675 * - encoding: Set by user.
1676 * - decoding: unused
1682 * - encoding: Set by user.
1683 * - decoding: unused
1685 int me_penalty_compensation;
1689 * - encoding: Set by user.
1690 * - decoding: unused
1696 * - encoding: Set by user.
1697 * - decoding: unused
1703 * - encoding: Set by user.
1704 * - decoding: unused
1709 * number of reference frames
1710 * - encoding: Set by user.
1711 * - decoding: Set by lavc.
1716 * chroma qp offset from luma
1717 * - encoding: Set by user.
1718 * - decoding: unused
1723 * Multiplied by qscale for each frame and added to scene_change_score.
1724 * - encoding: Set by user.
1725 * - decoding: unused
1727 int scenechange_factor;
1731 * Note: Value depends upon the compare function used for fullpel ME.
1732 * - encoding: Set by user.
1733 * - decoding: unused
1738 * Adjust sensitivity of b_frame_strategy 1.
1739 * - encoding: Set by user.
1740 * - decoding: unused
1745 * Chromaticity coordinates of the source primaries.
1746 * - encoding: Set by user
1747 * - decoding: Set by libavcodec
1749 enum AVColorPrimaries color_primaries;
1752 * Color Transfer Characteristic.
1753 * - encoding: Set by user
1754 * - decoding: Set by libavcodec
1756 enum AVColorTransferCharacteristic color_trc;
1759 * YUV colorspace type.
1760 * - encoding: Set by user
1761 * - decoding: Set by libavcodec
1763 enum AVColorSpace colorspace;
1766 * MPEG vs JPEG YUV range.
1767 * - encoding: Set by user
1768 * - decoding: Set by libavcodec
1770 enum AVColorRange color_range;
1773 * This defines the location of chroma samples.
1774 * - encoding: Set by user
1775 * - decoding: Set by libavcodec
1777 enum AVChromaLocation chroma_sample_location;
1781 * Indicates number of picture subdivisions. Used for parallelized
1783 * - encoding: Set by user
1784 * - decoding: unused
1789 * - encoding: set by libavcodec
1790 * - decoding: Set by libavcodec
1792 enum AVFieldOrder field_order;
1795 int sample_rate; ///< samples per second
1796 int channels; ///< number of audio channels
1799 * audio sample format
1800 * - encoding: Set by user.
1801 * - decoding: Set by libavcodec.
1803 enum AVSampleFormat sample_fmt; ///< sample format
1805 /* The following data should not be initialized. */
1807 * Number of samples per channel in an audio frame.
1809 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1810 * except the last must contain exactly frame_size samples per channel.
1811 * May be 0 when the codec has CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1812 * frame size is not restricted.
1813 * - decoding: may be set by some decoders to indicate constant frame size
1818 * Frame counter, set by libavcodec.
1820 * - decoding: total number of frames returned from the decoder so far.
1821 * - encoding: total number of frames passed to the encoder so far.
1823 * @note the counter is not incremented if encoding/decoding resulted in
1829 * number of bytes per packet if constant and known or 0
1830 * Used by some WAV based audio codecs.
1835 * Audio cutoff bandwidth (0 means "automatic")
1836 * - encoding: Set by user.
1837 * - decoding: unused
1841 #if FF_API_REQUEST_CHANNELS
1843 * Decoder should decode to this many channels if it can (0 for default)
1844 * - encoding: unused
1845 * - decoding: Set by user.
1846 * @deprecated Deprecated in favor of request_channel_layout.
1848 attribute_deprecated int request_channels;
1852 * Audio channel layout.
1853 * - encoding: set by user.
1854 * - decoding: set by libavcodec.
1856 uint64_t channel_layout;
1859 * Request decoder to use this channel layout if it can (0 for default)
1860 * - encoding: unused
1861 * - decoding: Set by user.
1863 uint64_t request_channel_layout;
1866 * Type of service that the audio stream conveys.
1867 * - encoding: Set by user.
1868 * - decoding: Set by libavcodec.
1870 enum AVAudioServiceType audio_service_type;
1873 * Used to request a sample format from the decoder.
1874 * - encoding: unused.
1875 * - decoding: Set by user.
1877 enum AVSampleFormat request_sample_fmt;
1879 #if FF_API_GET_BUFFER
1881 * Called at the beginning of each frame to get a buffer for it.
1883 * The function will set AVFrame.data[], AVFrame.linesize[].
1884 * AVFrame.extended_data[] must also be set, but it should be the same as
1885 * AVFrame.data[] except for planar audio with more channels than can fit
1886 * in AVFrame.data[]. In that case, AVFrame.data[] shall still contain as
1887 * many data pointers as it can hold.
1889 * if CODEC_CAP_DR1 is not set then get_buffer() must call
1890 * avcodec_default_get_buffer() instead of providing buffers allocated by
1893 * AVFrame.data[] should be 32- or 16-byte-aligned unless the CPU doesn't
1894 * need it. avcodec_default_get_buffer() aligns the output buffer properly,
1895 * but if get_buffer() is overridden then alignment considerations should
1896 * be taken into account.
1898 * @see avcodec_default_get_buffer()
1902 * If pic.reference is set then the frame will be read later by libavcodec.
1903 * avcodec_align_dimensions2() should be used to find the required width and
1904 * height, as they normally need to be rounded up to the next multiple of 16.
1906 * If frame multithreading is used and thread_safe_callbacks is set,
1907 * it may be called from a different thread, but not from more than one at
1908 * once. Does not need to be reentrant.
1910 * @see release_buffer(), reget_buffer()
1911 * @see avcodec_align_dimensions2()
1915 * Decoders request a buffer of a particular size by setting
1916 * AVFrame.nb_samples prior to calling get_buffer(). The decoder may,
1917 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1918 * to a smaller value in the output frame.
1920 * Decoders cannot use the buffer after returning from
1921 * avcodec_decode_audio4(), so they will not call release_buffer(), as it
1922 * is assumed to be released immediately upon return. In some rare cases,
1923 * a decoder may need to call get_buffer() more than once in a single
1924 * call to avcodec_decode_audio4(). In that case, when get_buffer() is
1925 * called again after it has already been called once, the previously
1926 * acquired buffer is assumed to be released at that time and may not be
1927 * reused by the decoder.
1929 * As a convenience, av_samples_get_buffer_size() and
1930 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer()
1931 * functions to find the required data size and to fill data pointers and
1932 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1933 * since all planes must be the same size.
1935 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1937 * - encoding: unused
1938 * - decoding: Set by libavcodec, user can override.
1940 * @deprecated use get_buffer2()
1942 attribute_deprecated
1943 int (*get_buffer)(struct AVCodecContext *c, AVFrame *pic);
1946 * Called to release buffers which were allocated with get_buffer.
1947 * A released buffer can be reused in get_buffer().
1948 * pic.data[*] must be set to NULL.
1949 * May be called from a different thread if frame multithreading is used,
1950 * but not by more than one thread at once, so does not need to be reentrant.
1951 * - encoding: unused
1952 * - decoding: Set by libavcodec, user can override.
1954 * @deprecated custom freeing callbacks should be set from get_buffer2()
1956 attribute_deprecated
1957 void (*release_buffer)(struct AVCodecContext *c, AVFrame *pic);
1960 * Called at the beginning of a frame to get cr buffer for it.
1961 * Buffer type (size, hints) must be the same. libavcodec won't check it.
1962 * libavcodec will pass previous buffer in pic, function should return
1963 * same buffer or new buffer with old frame "painted" into it.
1964 * If pic.data[0] == NULL must behave like get_buffer().
1965 * if CODEC_CAP_DR1 is not set then reget_buffer() must call
1966 * avcodec_default_reget_buffer() instead of providing buffers allocated by
1968 * - encoding: unused
1969 * - decoding: Set by libavcodec, user can override.
1971 attribute_deprecated
1972 int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);
1976 * This callback is called at the beginning of each frame to get data
1977 * buffer(s) for it. There may be one contiguous buffer for all the data or
1978 * there may be a buffer per each data plane or anything in between. What
1979 * this means is, you may set however many entries in buf[] you feel necessary.
1980 * Each buffer must be reference-counted using the AVBuffer API (see description
1983 * The following fields will be set in the frame before this callback is
1986 * - width, height (video only)
1987 * - sample_rate, channel_layout, nb_samples (audio only)
1988 * Their values may differ from the corresponding values in
1989 * AVCodecContext. This callback must use the frame values, not the codec
1990 * context values, to calculate the required buffer size.
1992 * This callback must fill the following fields in the frame:
1996 * * if the data is planar audio with more than 8 channels, then this
1997 * callback must allocate and fill extended_data to contain all pointers
1998 * to all data planes. data[] must hold as many pointers as it can.
1999 * extended_data must be allocated with av_malloc() and will be freed in
2001 * * otherwise exended_data must point to data
2002 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2003 * the frame's data and extended_data pointers must be contained in these. That
2004 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2005 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2006 * and av_buffer_ref().
2007 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2008 * this callback and filled with the extra buffers if there are more
2009 * buffers than buf[] can hold. extended_buf will be freed in
2012 * If CODEC_CAP_DR1 is not set then get_buffer2() must call
2013 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2016 * Each data plane must be aligned to the maximum required by the target
2019 * @see avcodec_default_get_buffer2()
2023 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2024 * (read and/or written to if it is writable) later by libavcodec.
2026 * avcodec_align_dimensions2() should be used to find the required width and
2027 * height, as they normally need to be rounded up to the next multiple of 16.
2029 * If frame multithreading is used and thread_safe_callbacks is set,
2030 * this callback may be called from a different thread, but not from more
2031 * than one at once. Does not need to be reentrant.
2033 * @see avcodec_align_dimensions2()
2037 * Decoders request a buffer of a particular size by setting
2038 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2039 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2040 * to a smaller value in the output frame.
2042 * As a convenience, av_samples_get_buffer_size() and
2043 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2044 * functions to find the required data size and to fill data pointers and
2045 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2046 * since all planes must be the same size.
2048 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2050 * - encoding: unused
2051 * - decoding: Set by libavcodec, user can override.
2053 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2056 * If non-zero, the decoded audio and video frames returned from
2057 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2058 * and are valid indefinitely. The caller must free them with
2059 * av_frame_unref() when they are not needed anymore.
2060 * Otherwise, the decoded frames must not be freed by the caller and are
2061 * only valid until the next decode call.
2063 * - encoding: unused
2064 * - decoding: set by the caller before avcodec_open2().
2066 int refcounted_frames;
2068 /* - encoding parameters */
2069 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2070 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2074 * - encoding: Set by user.
2075 * - decoding: unused
2081 * - encoding: Set by user.
2082 * - decoding: unused
2087 * maximum quantizer difference between frames
2088 * - encoding: Set by user.
2089 * - decoding: unused
2094 * ratecontrol qmin qmax limiting method
2095 * 0-> clipping, 1-> use a nice continuous function to limit qscale wthin qmin/qmax.
2096 * - encoding: Set by user.
2097 * - decoding: unused
2105 * decoder bitstream buffer size
2106 * - encoding: Set by user.
2107 * - decoding: unused
2112 * ratecontrol override, see RcOverride
2113 * - encoding: Allocated/set/freed by user.
2114 * - decoding: unused
2116 int rc_override_count;
2117 RcOverride *rc_override;
2120 * rate control equation
2121 * - encoding: Set by user
2122 * - decoding: unused
2128 * - encoding: Set by user.
2129 * - decoding: unused
2135 * - encoding: Set by user.
2136 * - decoding: unused
2140 float rc_buffer_aggressivity;
2143 * initial complexity for pass1 ratecontrol
2144 * - encoding: Set by user.
2145 * - decoding: unused
2147 float rc_initial_cplx;
2150 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2151 * - encoding: Set by user.
2152 * - decoding: unused.
2154 float rc_max_available_vbv_use;
2157 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2158 * - encoding: Set by user.
2159 * - decoding: unused.
2161 float rc_min_vbv_overflow_use;
2164 * Number of bits which should be loaded into the rc buffer before decoding starts.
2165 * - encoding: Set by user.
2166 * - decoding: unused
2168 int rc_initial_buffer_occupancy;
2170 #define FF_CODER_TYPE_VLC 0
2171 #define FF_CODER_TYPE_AC 1
2172 #define FF_CODER_TYPE_RAW 2
2173 #define FF_CODER_TYPE_RLE 3
2174 #define FF_CODER_TYPE_DEFLATE 4
2177 * - encoding: Set by user.
2178 * - decoding: unused
2184 * - encoding: Set by user.
2185 * - decoding: unused
2190 * minimum Lagrange multipler
2191 * - encoding: Set by user.
2192 * - decoding: unused
2197 * maximum Lagrange multipler
2198 * - encoding: Set by user.
2199 * - decoding: unused
2204 * frame skip threshold
2205 * - encoding: Set by user.
2206 * - decoding: unused
2208 int frame_skip_threshold;
2212 * - encoding: Set by user.
2213 * - decoding: unused
2215 int frame_skip_factor;
2218 * frame skip exponent
2219 * - encoding: Set by user.
2220 * - decoding: unused
2225 * frame skip comparison function
2226 * - encoding: Set by user.
2227 * - decoding: unused
2232 * trellis RD quantization
2233 * - encoding: Set by user.
2234 * - decoding: unused
2239 * - encoding: Set by user.
2240 * - decoding: unused
2242 int min_prediction_order;
2245 * - encoding: Set by user.
2246 * - decoding: unused
2248 int max_prediction_order;
2251 * GOP timecode frame start number, in non drop frame format
2252 * - encoding: Set by user.
2253 * - decoding: unused
2255 int64_t timecode_frame_start;
2257 /* The RTP callback: This function is called */
2258 /* every time the encoder has a packet to send. */
2259 /* It depends on the encoder if the data starts */
2260 /* with a Start Code (it should). H.263 does. */
2261 /* mb_nb contains the number of macroblocks */
2262 /* encoded in the RTP payload. */
2263 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2265 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2266 /* do its best to deliver a chunk with size */
2267 /* below rtp_payload_size, the chunk will start */
2268 /* with a start code on some codecs like H.263. */
2269 /* This doesn't take account of any particular */
2270 /* headers inside the transmitted RTP payload. */
2272 /* statistics, used for 2-pass encoding */
2283 * number of bits used for the previously encoded frame
2284 * - encoding: Set by libavcodec.
2285 * - decoding: unused
2290 * pass1 encoding statistics output buffer
2291 * - encoding: Set by libavcodec.
2292 * - decoding: unused
2297 * pass2 encoding statistics input buffer
2298 * Concatenated stuff from stats_out of pass1 should be placed here.
2299 * - encoding: Allocated/set/freed by user.
2300 * - decoding: unused
2305 * Work around bugs in encoders which sometimes cannot be detected automatically.
2306 * - encoding: Set by user
2307 * - decoding: Set by user
2309 int workaround_bugs;
2310 #define FF_BUG_AUTODETECT 1 ///< autodetection
2311 #if FF_API_OLD_MSMPEG4
2312 #define FF_BUG_OLD_MSMPEG4 2
2314 #define FF_BUG_XVID_ILACE 4
2315 #define FF_BUG_UMP4 8
2316 #define FF_BUG_NO_PADDING 16
2317 #define FF_BUG_AMV 32
2319 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2321 #define FF_BUG_QPEL_CHROMA 64
2322 #define FF_BUG_STD_QPEL 128
2323 #define FF_BUG_QPEL_CHROMA2 256
2324 #define FF_BUG_DIRECT_BLOCKSIZE 512
2325 #define FF_BUG_EDGE 1024
2326 #define FF_BUG_HPEL_CHROMA 2048
2327 #define FF_BUG_DC_CLIP 4096
2328 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2329 #define FF_BUG_TRUNCATED 16384
2332 * strictly follow the standard (MPEG4, ...).
2333 * - encoding: Set by user.
2334 * - decoding: Set by user.
2335 * Setting this to STRICT or higher means the encoder and decoder will
2336 * generally do stupid things, whereas setting it to unofficial or lower
2337 * will mean the encoder might produce output that is not supported by all
2338 * spec-compliant decoders. Decoders don't differentiate between normal,
2339 * unofficial and experimental (that is, they always try to decode things
2340 * when they can) unless they are explicitly asked to behave stupidly
2341 * (=strictly conform to the specs)
2343 int strict_std_compliance;
2344 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2345 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2346 #define FF_COMPLIANCE_NORMAL 0
2347 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2348 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2351 * error concealment flags
2352 * - encoding: unused
2353 * - decoding: Set by user.
2355 int error_concealment;
2356 #define FF_EC_GUESS_MVS 1
2357 #define FF_EC_DEBLOCK 2
2361 * - encoding: Set by user.
2362 * - decoding: Set by user.
2365 #define FF_DEBUG_PICT_INFO 1
2366 #define FF_DEBUG_RC 2
2367 #define FF_DEBUG_BITSTREAM 4
2368 #define FF_DEBUG_MB_TYPE 8
2369 #define FF_DEBUG_QP 16
2372 * @deprecated this option does nothing
2374 #define FF_DEBUG_MV 32
2376 #define FF_DEBUG_DCT_COEFF 0x00000040
2377 #define FF_DEBUG_SKIP 0x00000080
2378 #define FF_DEBUG_STARTCODE 0x00000100
2379 #define FF_DEBUG_PTS 0x00000200
2380 #define FF_DEBUG_ER 0x00000400
2381 #define FF_DEBUG_MMCO 0x00000800
2382 #define FF_DEBUG_BUGS 0x00001000
2384 #define FF_DEBUG_VIS_QP 0x00002000
2385 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2387 #define FF_DEBUG_BUFFERS 0x00008000
2388 #define FF_DEBUG_THREADS 0x00010000
2392 * @deprecated this option does not have any effect
2394 attribute_deprecated
2396 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
2397 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
2398 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
2402 * Error recognition; may misdetect some more or less valid parts as errors.
2403 * - encoding: unused
2404 * - decoding: Set by user.
2406 int err_recognition;
2409 * Verify checksums embedded in the bitstream (could be of either encoded or
2410 * decoded data, depending on the codec) and print an error message on mismatch.
2411 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2412 * decoder returning an error.
2414 #define AV_EF_CRCCHECK (1<<0)
2415 #define AV_EF_BITSTREAM (1<<1)
2416 #define AV_EF_BUFFER (1<<2)
2417 #define AV_EF_EXPLODE (1<<3)
2420 * opaque 64bit number (generally a PTS) that will be reordered and
2421 * output in AVFrame.reordered_opaque
2422 * @deprecated in favor of pkt_pts
2423 * - encoding: unused
2424 * - decoding: Set by user.
2426 int64_t reordered_opaque;
2429 * Hardware accelerator in use
2430 * - encoding: unused.
2431 * - decoding: Set by libavcodec
2433 struct AVHWAccel *hwaccel;
2436 * Hardware accelerator context.
2437 * For some hardware accelerators, a global context needs to be
2438 * provided by the user. In that case, this holds display-dependent
2439 * data Libav cannot instantiate itself. Please refer to the
2440 * Libav HW accelerator documentation to know how to fill this
2441 * is. e.g. for VA API, this is a struct vaapi_context.
2442 * - encoding: unused
2443 * - decoding: Set by user
2445 void *hwaccel_context;
2449 * - encoding: Set by libavcodec if flags&CODEC_FLAG_PSNR.
2450 * - decoding: unused
2452 uint64_t error[AV_NUM_DATA_POINTERS];
2455 * DCT algorithm, see FF_DCT_* below
2456 * - encoding: Set by user.
2457 * - decoding: unused
2460 #define FF_DCT_AUTO 0
2461 #define FF_DCT_FASTINT 1
2462 #define FF_DCT_INT 2
2463 #define FF_DCT_MMX 3
2464 #define FF_DCT_ALTIVEC 5
2465 #define FF_DCT_FAAN 6
2468 * IDCT algorithm, see FF_IDCT_* below.
2469 * - encoding: Set by user.
2470 * - decoding: Set by user.
2473 #define FF_IDCT_AUTO 0
2474 #define FF_IDCT_INT 1
2475 #define FF_IDCT_SIMPLE 2
2476 #define FF_IDCT_SIMPLEMMX 3
2477 #define FF_IDCT_ARM 7
2478 #define FF_IDCT_ALTIVEC 8
2480 #define FF_IDCT_SH4 9
2482 #define FF_IDCT_SIMPLEARM 10
2483 #define FF_IDCT_IPP 13
2484 #define FF_IDCT_XVIDMMX 14
2485 #define FF_IDCT_SIMPLEARMV5TE 16
2486 #define FF_IDCT_SIMPLEARMV6 17
2487 #if FF_API_ARCH_SPARC
2488 #define FF_IDCT_SIMPLEVIS 18
2490 #define FF_IDCT_FAAN 20
2491 #define FF_IDCT_SIMPLENEON 22
2492 #if FF_API_ARCH_ALPHA
2493 #define FF_IDCT_SIMPLEALPHA 23
2497 * bits per sample/pixel from the demuxer (needed for huffyuv).
2498 * - encoding: Set by libavcodec.
2499 * - decoding: Set by user.
2501 int bits_per_coded_sample;
2504 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2505 * - encoding: set by user.
2506 * - decoding: set by libavcodec.
2508 int bits_per_raw_sample;
2512 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2513 * - encoding: unused
2514 * - decoding: Set by user.
2516 * @deprecated use decoder private options instead
2518 attribute_deprecated int lowres;
2522 * the picture in the bitstream
2523 * - encoding: Set by libavcodec.
2524 * - decoding: unused
2526 AVFrame *coded_frame;
2530 * is used to decide how many independent tasks should be passed to execute()
2531 * - encoding: Set by user.
2532 * - decoding: Set by user.
2537 * Which multithreading methods to use.
2538 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2539 * so clients which cannot provide future frames should not use it.
2541 * - encoding: Set by user, otherwise the default is used.
2542 * - decoding: Set by user, otherwise the default is used.
2545 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2546 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2549 * Which multithreading methods are in use by the codec.
2550 * - encoding: Set by libavcodec.
2551 * - decoding: Set by libavcodec.
2553 int active_thread_type;
2556 * Set by the client if its custom get_buffer() callback can be called
2557 * synchronously from another thread, which allows faster multithreaded decoding.
2558 * draw_horiz_band() will be called from other threads regardless of this setting.
2559 * Ignored if the default get_buffer() is used.
2560 * - encoding: Set by user.
2561 * - decoding: Set by user.
2563 int thread_safe_callbacks;
2566 * The codec may call this to execute several independent things.
2567 * It will return only after finishing all tasks.
2568 * The user may replace this with some multithreaded implementation,
2569 * the default implementation will execute the parts serially.
2570 * @param count the number of things to execute
2571 * - encoding: Set by libavcodec, user can override.
2572 * - decoding: Set by libavcodec, user can override.
2574 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2577 * The codec may call this to execute several independent things.
2578 * It will return only after finishing all tasks.
2579 * The user may replace this with some multithreaded implementation,
2580 * the default implementation will execute the parts serially.
2581 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2582 * @param c context passed also to func
2583 * @param count the number of things to execute
2584 * @param arg2 argument passed unchanged to func
2585 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2586 * @param func function that will be called count times, with jobnr from 0 to count-1.
2587 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2588 * two instances of func executing at the same time will have the same threadnr.
2589 * @return always 0 currently, but code should handle a future improvement where when any call to func
2590 * returns < 0 no further calls to func may be done and < 0 is returned.
2591 * - encoding: Set by libavcodec, user can override.
2592 * - decoding: Set by libavcodec, user can override.
2594 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2596 #if FF_API_THREAD_OPAQUE
2598 * @deprecated this field should not be used from outside of lavc
2600 attribute_deprecated
2601 void *thread_opaque;
2605 * noise vs. sse weight for the nsse comparsion function
2606 * - encoding: Set by user.
2607 * - decoding: unused
2613 * - encoding: Set by user.
2614 * - decoding: Set by libavcodec.
2617 #define FF_PROFILE_UNKNOWN -99
2618 #define FF_PROFILE_RESERVED -100
2620 #define FF_PROFILE_AAC_MAIN 0
2621 #define FF_PROFILE_AAC_LOW 1
2622 #define FF_PROFILE_AAC_SSR 2
2623 #define FF_PROFILE_AAC_LTP 3
2624 #define FF_PROFILE_AAC_HE 4
2625 #define FF_PROFILE_AAC_HE_V2 28
2626 #define FF_PROFILE_AAC_LD 22
2627 #define FF_PROFILE_AAC_ELD 38
2628 #define FF_PROFILE_MPEG2_AAC_LOW 128
2629 #define FF_PROFILE_MPEG2_AAC_HE 131
2631 #define FF_PROFILE_DTS 20
2632 #define FF_PROFILE_DTS_ES 30
2633 #define FF_PROFILE_DTS_96_24 40
2634 #define FF_PROFILE_DTS_HD_HRA 50
2635 #define FF_PROFILE_DTS_HD_MA 60
2637 #define FF_PROFILE_MPEG2_422 0
2638 #define FF_PROFILE_MPEG2_HIGH 1
2639 #define FF_PROFILE_MPEG2_SS 2
2640 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2641 #define FF_PROFILE_MPEG2_MAIN 4
2642 #define FF_PROFILE_MPEG2_SIMPLE 5
2644 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2645 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2647 #define FF_PROFILE_H264_BASELINE 66
2648 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2649 #define FF_PROFILE_H264_MAIN 77
2650 #define FF_PROFILE_H264_EXTENDED 88
2651 #define FF_PROFILE_H264_HIGH 100
2652 #define FF_PROFILE_H264_HIGH_10 110
2653 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2654 #define FF_PROFILE_H264_HIGH_422 122
2655 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2656 #define FF_PROFILE_H264_HIGH_444 144
2657 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2658 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2659 #define FF_PROFILE_H264_CAVLC_444 44
2661 #define FF_PROFILE_VC1_SIMPLE 0
2662 #define FF_PROFILE_VC1_MAIN 1
2663 #define FF_PROFILE_VC1_COMPLEX 2
2664 #define FF_PROFILE_VC1_ADVANCED 3
2666 #define FF_PROFILE_MPEG4_SIMPLE 0
2667 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2668 #define FF_PROFILE_MPEG4_CORE 2
2669 #define FF_PROFILE_MPEG4_MAIN 3
2670 #define FF_PROFILE_MPEG4_N_BIT 4
2671 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2672 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2673 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2674 #define FF_PROFILE_MPEG4_HYBRID 8
2675 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2676 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2677 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2678 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2679 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2680 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2681 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2683 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 0
2684 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 1
2685 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 2
2686 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2687 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2690 #define FF_PROFILE_HEVC_MAIN 1
2691 #define FF_PROFILE_HEVC_MAIN_10 2
2692 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2696 * - encoding: Set by user.
2697 * - decoding: Set by libavcodec.
2700 #define FF_LEVEL_UNKNOWN -99
2704 * - encoding: unused
2705 * - decoding: Set by user.
2707 enum AVDiscard skip_loop_filter;
2711 * - encoding: unused
2712 * - decoding: Set by user.
2714 enum AVDiscard skip_idct;
2718 * - encoding: unused
2719 * - decoding: Set by user.
2721 enum AVDiscard skip_frame;
2724 * Header containing style information for text subtitles.
2725 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2726 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2727 * the Format line following. It shouldn't include any Dialogue line.
2728 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2729 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2731 uint8_t *subtitle_header;
2732 int subtitle_header_size;
2734 #if FF_API_ERROR_RATE
2736 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
2739 attribute_deprecated
2743 #if FF_API_CODEC_PKT
2745 * @deprecated this field is not supposed to be accessed from outside lavc
2747 attribute_deprecated
2752 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2753 * Used for compliant TS muxing.
2754 * - encoding: Set by libavcodec.
2755 * - decoding: unused.
2763 typedef struct AVProfile {
2765 const char *name; ///< short name for the profile
2768 typedef struct AVCodecDefault AVCodecDefault;
2775 typedef struct AVCodec {
2777 * Name of the codec implementation.
2778 * The name is globally unique among encoders and among decoders (but an
2779 * encoder and a decoder can share the same name).
2780 * This is the primary way to find a codec from the user perspective.
2784 * Descriptive name for the codec, meant to be more human readable than name.
2785 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2787 const char *long_name;
2788 enum AVMediaType type;
2791 * Codec capabilities.
2795 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2796 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2797 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2798 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2799 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2801 attribute_deprecated uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
2803 const AVClass *priv_class; ///< AVClass for the private context
2804 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2806 /*****************************************************************
2807 * No fields below this line are part of the public API. They
2808 * may not be used outside of libavcodec and can be changed and
2810 * New public fields should be added right above.
2811 *****************************************************************
2814 struct AVCodec *next;
2816 * @name Frame-level threading support functions
2820 * If defined, called on thread contexts when they are created.
2821 * If the codec allocates writable tables in init(), re-allocate them here.
2822 * priv_data will be set to a copy of the original.
2824 int (*init_thread_copy)(AVCodecContext *);
2826 * Copy necessary context variables from a previous thread context to the current one.
2827 * If not defined, the next thread will start automatically; otherwise, the codec
2828 * must call ff_thread_finish_setup().
2830 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2832 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2836 * Private codec-specific defaults.
2838 const AVCodecDefault *defaults;
2841 * Initialize codec static data, called from avcodec_register().
2843 void (*init_static_data)(struct AVCodec *codec);
2845 int (*init)(AVCodecContext *);
2846 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2847 const struct AVSubtitle *sub);
2849 * Encode data to an AVPacket.
2851 * @param avctx codec context
2852 * @param avpkt output AVPacket (may contain a user-provided buffer)
2853 * @param[in] frame AVFrame containing the raw data to be encoded
2854 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2855 * non-empty packet was returned in avpkt.
2856 * @return 0 on success, negative error code on failure
2858 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2859 int *got_packet_ptr);
2860 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2861 int (*close)(AVCodecContext *);
2864 * Will be called when seeking
2866 void (*flush)(AVCodecContext *);
2872 typedef struct AVHWAccel {
2874 * Name of the hardware accelerated codec.
2875 * The name is globally unique among encoders and among decoders (but an
2876 * encoder and a decoder can share the same name).
2881 * Type of codec implemented by the hardware accelerator.
2883 * See AVMEDIA_TYPE_xxx
2885 enum AVMediaType type;
2888 * Codec implemented by the hardware accelerator.
2890 * See AV_CODEC_ID_xxx
2895 * Supported pixel format.
2897 * Only hardware accelerated formats are supported here.
2899 enum AVPixelFormat pix_fmt;
2902 * Hardware accelerated codec capabilities.
2903 * see FF_HWACCEL_CODEC_CAP_*
2907 struct AVHWAccel *next;
2910 * Called at the beginning of each frame or field picture.
2912 * Meaningful frame information (codec specific) is guaranteed to
2913 * be parsed at this point. This function is mandatory.
2915 * Note that buf can be NULL along with buf_size set to 0.
2916 * Otherwise, this means the whole frame is available at this point.
2918 * @param avctx the codec context
2919 * @param buf the frame data buffer base
2920 * @param buf_size the size of the frame in bytes
2921 * @return zero if successful, a negative value otherwise
2923 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2926 * Callback for each slice.
2928 * Meaningful slice information (codec specific) is guaranteed to
2929 * be parsed at this point. This function is mandatory.
2931 * @param avctx the codec context
2932 * @param buf the slice data buffer base
2933 * @param buf_size the size of the slice in bytes
2934 * @return zero if successful, a negative value otherwise
2936 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2939 * Called at the end of each frame or field picture.
2941 * The whole picture is parsed at this point and can now be sent
2942 * to the hardware accelerator. This function is mandatory.
2944 * @param avctx the codec context
2945 * @return zero if successful, a negative value otherwise
2947 int (*end_frame)(AVCodecContext *avctx);
2950 * Size of HW accelerator private data.
2952 * Private data is allocated with av_mallocz() before
2953 * AVCodecContext.get_buffer() and deallocated after
2954 * AVCodecContext.release_buffer().
2960 * @defgroup lavc_picture AVPicture
2962 * Functions for working with AVPicture
2967 * four components are given, that's all.
2968 * the last component is alpha
2970 typedef struct AVPicture {
2971 uint8_t *data[AV_NUM_DATA_POINTERS];
2972 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
2979 #define AVPALETTE_SIZE 1024
2980 #define AVPALETTE_COUNT 256
2982 enum AVSubtitleType {
2985 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
2988 * Plain text, the text field must be set by the decoder and is
2989 * authoritative. ass and pict fields may contain approximations.
2994 * Formatted text, the ass field must be set by the decoder and is
2995 * authoritative. pict and text fields may contain approximations.
3000 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3002 typedef struct AVSubtitleRect {
3003 int x; ///< top left corner of pict, undefined when pict is not set
3004 int y; ///< top left corner of pict, undefined when pict is not set
3005 int w; ///< width of pict, undefined when pict is not set
3006 int h; ///< height of pict, undefined when pict is not set
3007 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3010 * data+linesize for the bitmap of this subtitle.
3011 * can be set for text/ass as well once they where rendered
3014 enum AVSubtitleType type;
3016 char *text; ///< 0 terminated plain UTF-8 text
3019 * 0 terminated ASS/SSA compatible event line.
3020 * The pressentation of this is unaffected by the other values in this
3027 typedef struct AVSubtitle {
3028 uint16_t format; /* 0 = graphics */
3029 uint32_t start_display_time; /* relative to packet pts, in ms */
3030 uint32_t end_display_time; /* relative to packet pts, in ms */
3032 AVSubtitleRect **rects;
3033 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3037 * If c is NULL, returns the first registered codec,
3038 * if c is non-NULL, returns the next registered codec after c,
3039 * or NULL if c is the last one.
3041 AVCodec *av_codec_next(const AVCodec *c);
3044 * Return the LIBAVCODEC_VERSION_INT constant.
3046 unsigned avcodec_version(void);
3049 * Return the libavcodec build-time configuration.
3051 const char *avcodec_configuration(void);
3054 * Return the libavcodec license.
3056 const char *avcodec_license(void);
3059 * Register the codec codec and initialize libavcodec.
3061 * @warning either this function or avcodec_register_all() must be called
3062 * before any other libavcodec functions.
3064 * @see avcodec_register_all()
3066 void avcodec_register(AVCodec *codec);
3069 * Register all the codecs, parsers and bitstream filters which were enabled at
3070 * configuration time. If you do not call this function you can select exactly
3071 * which formats you want to support, by using the individual registration
3074 * @see avcodec_register
3075 * @see av_register_codec_parser
3076 * @see av_register_bitstream_filter
3078 void avcodec_register_all(void);
3081 * Allocate an AVCodecContext and set its fields to default values. The
3082 * resulting struct can be deallocated by calling avcodec_close() on it followed
3085 * @param codec if non-NULL, allocate private data and initialize defaults
3086 * for the given codec. It is illegal to then call avcodec_open2()
3087 * with a different codec.
3088 * If NULL, then the codec-specific defaults won't be initialized,
3089 * which may result in suboptimal default settings (this is
3090 * important mainly for encoders, e.g. libx264).
3092 * @return An AVCodecContext filled with default values or NULL on failure.
3093 * @see avcodec_get_context_defaults
3095 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3098 * Set the fields of the given AVCodecContext to default values corresponding
3099 * to the given codec (defaults may be codec-dependent).
3101 * Do not call this function if a non-NULL codec has been passed
3102 * to avcodec_alloc_context3() that allocated this AVCodecContext.
3103 * If codec is non-NULL, it is illegal to call avcodec_open2() with a
3104 * different codec on this AVCodecContext.
3106 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3109 * Get the AVClass for AVCodecContext. It can be used in combination with
3110 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3112 * @see av_opt_find().
3114 const AVClass *avcodec_get_class(void);
3117 * Copy the settings of the source AVCodecContext into the destination
3118 * AVCodecContext. The resulting destination codec context will be
3119 * unopened, i.e. you are required to call avcodec_open2() before you
3120 * can use this AVCodecContext to decode/encode video/audio data.
3122 * @param dest target codec context, should be initialized with
3123 * avcodec_alloc_context3(), but otherwise uninitialized
3124 * @param src source codec context
3125 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3127 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3129 #if FF_API_AVFRAME_LAVC
3131 * @deprecated use av_frame_alloc()
3133 attribute_deprecated
3134 AVFrame *avcodec_alloc_frame(void);
3137 * Set the fields of the given AVFrame to default values.
3139 * @param frame The AVFrame of which the fields should be set to default values.
3141 * @deprecated use av_frame_unref()
3143 attribute_deprecated
3144 void avcodec_get_frame_defaults(AVFrame *frame);
3147 * Free the frame and any dynamically allocated objects in it,
3148 * e.g. extended_data.
3150 * @param frame frame to be freed. The pointer will be set to NULL.
3152 * @warning this function does NOT free the data buffers themselves
3153 * (it does not know how, since they might have been allocated with
3154 * a custom get_buffer()).
3156 * @deprecated use av_frame_free()
3158 attribute_deprecated
3159 void avcodec_free_frame(AVFrame **frame);
3163 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3164 * function the context has to be allocated with avcodec_alloc_context3().
3166 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3167 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3168 * retrieving a codec.
3170 * @warning This function is not thread safe!
3173 * avcodec_register_all();
3174 * av_dict_set(&opts, "b", "2.5M", 0);
3175 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3179 * context = avcodec_alloc_context3(codec);
3181 * if (avcodec_open2(context, codec, opts) < 0)
3185 * @param avctx The context to initialize.
3186 * @param codec The codec to open this context for. If a non-NULL codec has been
3187 * previously passed to avcodec_alloc_context3() or
3188 * avcodec_get_context_defaults3() for this context, then this
3189 * parameter MUST be either NULL or equal to the previously passed
3191 * @param options A dictionary filled with AVCodecContext and codec-private options.
3192 * On return this object will be filled with options that were not found.
3194 * @return zero on success, a negative value on error
3195 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3196 * av_dict_set(), av_opt_find().
3198 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3201 * Close a given AVCodecContext and free all the data associated with it
3202 * (but not the AVCodecContext itself).
3204 * Calling this function on an AVCodecContext that hasn't been opened will free
3205 * the codec-specific data allocated in avcodec_alloc_context3() /
3206 * avcodec_get_context_defaults3() with a non-NULL codec. Subsequent calls will
3209 int avcodec_close(AVCodecContext *avctx);
3212 * Free all allocated data in the given subtitle struct.
3214 * @param sub AVSubtitle to free.
3216 void avsubtitle_free(AVSubtitle *sub);
3223 * @addtogroup lavc_packet
3227 #if FF_API_DESTRUCT_PACKET
3229 * Default packet destructor.
3230 * @deprecated use the AVBuffer API instead
3232 attribute_deprecated
3233 void av_destruct_packet(AVPacket *pkt);
3237 * Initialize optional fields of a packet with default values.
3239 * Note, this does not touch the data and size members, which have to be
3240 * initialized separately.
3244 void av_init_packet(AVPacket *pkt);
3247 * Allocate the payload of a packet and initialize its fields with
3251 * @param size wanted payload size
3252 * @return 0 if OK, AVERROR_xxx otherwise
3254 int av_new_packet(AVPacket *pkt, int size);
3257 * Reduce packet size, correctly zeroing padding
3260 * @param size new size
3262 void av_shrink_packet(AVPacket *pkt, int size);
3265 * Increase packet size, correctly zeroing padding
3268 * @param grow_by number of bytes by which to increase the size of the packet
3270 int av_grow_packet(AVPacket *pkt, int grow_by);
3273 * Initialize a reference-counted packet from av_malloc()ed data.
3275 * @param pkt packet to be initialized. This function will set the data, size,
3276 * buf and destruct fields, all others are left untouched.
3277 * @param data Data allocated by av_malloc() to be used as packet data. If this
3278 * function returns successfully, the data is owned by the underlying AVBuffer.
3279 * The caller may not access the data through other means.
3280 * @param size size of data in bytes, without the padding. I.e. the full buffer
3281 * size is assumed to be size + FF_INPUT_BUFFER_PADDING_SIZE.
3283 * @return 0 on success, a negative AVERROR on error
3285 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3288 * @warning This is a hack - the packet memory allocation stuff is broken. The
3289 * packet is allocated if it was not really allocated.
3291 int av_dup_packet(AVPacket *pkt);
3296 * @param pkt packet to free
3298 void av_free_packet(AVPacket *pkt);
3301 * Allocate new information of a packet.
3304 * @param type side information type
3305 * @param size side information size
3306 * @return pointer to fresh allocated data or NULL otherwise
3308 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3312 * Shrink the already allocated side data buffer
3315 * @param type side information type
3316 * @param size new side information size
3317 * @return 0 on success, < 0 on failure
3319 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3323 * Get side information from packet.
3326 * @param type desired side information type
3327 * @param size pointer for side information size to store (optional)
3328 * @return pointer to data if present or NULL otherwise
3330 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3334 * Convenience function to free all the side data stored.
3335 * All the other fields stay untouched.
3339 void av_packet_free_side_data(AVPacket *pkt);
3342 * Setup a new reference to the data described by a given packet
3344 * If src is reference-counted, setup dst as a new reference to the
3345 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3346 * data from src into it.
3348 * All the other fields are copied from src.
3350 * @see av_packet_unref
3352 * @param dst Destination packet
3353 * @param src Source packet
3355 * @return 0 on success, a negative AVERROR on error.
3357 int av_packet_ref(AVPacket *dst, AVPacket *src);
3362 * Unreference the buffer referenced by the packet and reset the
3363 * remaining packet fields to their default values.
3365 * @param pkt The packet to be unreferenced.
3367 void av_packet_unref(AVPacket *pkt);
3370 * Move every field in src to dst and reset src.
3372 * @see av_packet_unref
3374 * @param src Source packet, will be reset
3375 * @param dst Destination packet
3377 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3380 * Copy only "properties" fields from src to dst.
3382 * Properties for the purpose of this function are all the fields
3383 * beside those related to the packet data (buf, data, size)
3385 * @param dst Destination packet
3386 * @param src Source packet
3388 * @return 0 on success AVERROR on failure.
3391 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3398 * @addtogroup lavc_decoding
3403 * Find a registered decoder with a matching codec ID.
3405 * @param id AVCodecID of the requested decoder
3406 * @return A decoder if one was found, NULL otherwise.
3408 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3411 * Find a registered decoder with the specified name.
3413 * @param name name of the requested decoder
3414 * @return A decoder if one was found, NULL otherwise.
3416 AVCodec *avcodec_find_decoder_by_name(const char *name);
3418 #if FF_API_GET_BUFFER
3419 attribute_deprecated int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic);
3420 attribute_deprecated void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic);
3421 attribute_deprecated int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic);
3425 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3426 * it can be called by custom get_buffer2() implementations for decoders without
3427 * CODEC_CAP_DR1 set.
3429 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3433 * Return the amount of padding in pixels which the get_buffer callback must
3434 * provide around the edge of the image for codecs which do not have the
3435 * CODEC_FLAG_EMU_EDGE flag.
3437 * @return Required padding in pixels.
3439 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
3442 attribute_deprecated
3443 unsigned avcodec_get_edge_width(void);
3447 * Modify width and height values so that they will result in a memory
3448 * buffer that is acceptable for the codec if you do not use any horizontal
3451 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3453 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3456 * Modify width and height values so that they will result in a memory
3457 * buffer that is acceptable for the codec if you also ensure that all
3458 * line sizes are a multiple of the respective linesize_align[i].
3460 * May only be used if a codec with CODEC_CAP_DR1 has been opened.
3462 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3463 int linesize_align[AV_NUM_DATA_POINTERS]);
3466 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3468 * Some decoders may support multiple frames in a single AVPacket. Such
3469 * decoders would then just decode the first frame and the return value would be
3470 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3471 * called again with an AVPacket containing the remaining data in order to
3472 * decode the second frame, etc... Even if no frames are returned, the packet
3473 * needs to be fed to the decoder with remaining data until it is completely
3474 * consumed or an error occurs.
3476 * Some decoders (those marked with CODEC_CAP_DELAY) have a delay between input
3477 * and output. This means that for some packets they will not immediately
3478 * produce decoded output and need to be flushed at the end of decoding to get
3479 * all the decoded data. Flushing is done by calling this function with packets
3480 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3481 * returning samples. It is safe to flush even those decoders that are not
3482 * marked with CODEC_CAP_DELAY, then no samples will be returned.
3484 * @warning The input buffer, avpkt->data must be FF_INPUT_BUFFER_PADDING_SIZE
3485 * larger than the actual read bytes because some optimized bitstream
3486 * readers read 32 or 64 bits at once and could read over the end.
3488 * @param avctx the codec context
3489 * @param[out] frame The AVFrame in which to store decoded audio samples.
3490 * The decoder will allocate a buffer for the decoded frame by
3491 * calling the AVCodecContext.get_buffer2() callback.
3492 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3493 * reference counted and the returned reference belongs to the
3494 * caller. The caller must release the frame using av_frame_unref()
3495 * when the frame is no longer needed. The caller may safely write
3496 * to the frame if av_frame_is_writable() returns 1.
3497 * When AVCodecContext.refcounted_frames is set to 0, the returned
3498 * reference belongs to the decoder and is valid only until the
3499 * next call to this function or until closing or flushing the
3500 * decoder. The caller may not write to it.
3501 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3502 * non-zero. Note that this field being set to zero
3503 * does not mean that an error has occurred. For
3504 * decoders with CODEC_CAP_DELAY set, no given decode
3505 * call is guaranteed to produce a frame.
3506 * @param[in] avpkt The input AVPacket containing the input buffer.
3507 * At least avpkt->data and avpkt->size should be set. Some
3508 * decoders might also require additional fields to be set.
3509 * @return A negative error code is returned if an error occurred during
3510 * decoding, otherwise the number of bytes consumed from the input
3511 * AVPacket is returned.
3513 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3514 int *got_frame_ptr, AVPacket *avpkt);
3517 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3518 * Some decoders may support multiple frames in a single AVPacket, such
3519 * decoders would then just decode the first frame.
3521 * @warning The input buffer must be FF_INPUT_BUFFER_PADDING_SIZE larger than
3522 * the actual read bytes because some optimized bitstream readers read 32 or 64
3523 * bits at once and could read over the end.
3525 * @warning The end of the input buffer buf should be set to 0 to ensure that
3526 * no overreading happens for damaged MPEG streams.
3528 * @note Codecs which have the CODEC_CAP_DELAY capability set have a delay
3529 * between input and output, these need to be fed with avpkt->data=NULL,
3530 * avpkt->size=0 at the end to return the remaining frames.
3532 * @param avctx the codec context
3533 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3534 * Use av_frame_alloc() to get an AVFrame. The codec will
3535 * allocate memory for the actual bitmap by calling the
3536 * AVCodecContext.get_buffer2() callback.
3537 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3538 * reference counted and the returned reference belongs to the
3539 * caller. The caller must release the frame using av_frame_unref()
3540 * when the frame is no longer needed. The caller may safely write
3541 * to the frame if av_frame_is_writable() returns 1.
3542 * When AVCodecContext.refcounted_frames is set to 0, the returned
3543 * reference belongs to the decoder and is valid only until the
3544 * next call to this function or until closing or flushing the
3545 * decoder. The caller may not write to it.
3547 * @param[in] avpkt The input AVpacket containing the input buffer.
3548 * You can create such packet with av_init_packet() and by then setting
3549 * data and size, some decoders might in addition need other fields like
3550 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3552 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3553 * @return On error a negative value is returned, otherwise the number of bytes
3554 * used or zero if no frame could be decompressed.
3556 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3557 int *got_picture_ptr,
3561 * Decode a subtitle message.
3562 * Return a negative value on error, otherwise return the number of bytes used.
3563 * If no subtitle could be decompressed, got_sub_ptr is zero.
3564 * Otherwise, the subtitle is stored in *sub.
3565 * Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3566 * simplicity, because the performance difference is expect to be negligible
3567 * and reusing a get_buffer written for video codecs would probably perform badly
3568 * due to a potentially very different allocation pattern.
3570 * @param avctx the codec context
3571 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3572 freed with avsubtitle_free if *got_sub_ptr is set.
3573 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3574 * @param[in] avpkt The input AVPacket containing the input buffer.
3576 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3581 * @defgroup lavc_parsing Frame parsing
3585 enum AVPictureStructure {
3586 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3587 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3588 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3589 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3592 typedef struct AVCodecParserContext {
3594 struct AVCodecParser *parser;
3595 int64_t frame_offset; /* offset of the current frame */
3596 int64_t cur_offset; /* current offset
3597 (incremented by each av_parser_parse()) */
3598 int64_t next_frame_offset; /* offset of the next frame */
3600 int pict_type; /* XXX: Put it back in AVCodecContext. */
3602 * This field is used for proper frame duration computation in lavf.
3603 * It signals, how much longer the frame duration of the current frame
3604 * is compared to normal frame duration.
3606 * frame_duration = (1 + repeat_pict) * time_base
3608 * It is used by codecs like H.264 to display telecined material.
3610 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
3611 int64_t pts; /* pts of the current frame */
3612 int64_t dts; /* dts of the current frame */
3617 int fetch_timestamp;
3619 #define AV_PARSER_PTS_NB 4
3620 int cur_frame_start_index;
3621 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
3622 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
3623 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
3626 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
3627 #define PARSER_FLAG_ONCE 0x0002
3628 /// Set if the parser has a valid file offset
3629 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
3631 int64_t offset; ///< byte offset from starting packet start
3632 int64_t cur_frame_end[AV_PARSER_PTS_NB];
3635 * Set by parser to 1 for key frames and 0 for non-key frames.
3636 * It is initialized to -1, so if the parser doesn't set this flag,
3637 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
3643 * Time difference in stream time base units from the pts of this
3644 * packet to the point at which the output from the decoder has converged
3645 * independent from the availability of previous frames. That is, the
3646 * frames are virtually identical no matter if decoding started from
3647 * the very first frame or from this keyframe.
3648 * Is AV_NOPTS_VALUE if unknown.
3649 * This field is not the display duration of the current frame.
3650 * This field has no meaning if the packet does not have AV_PKT_FLAG_KEY
3653 * The purpose of this field is to allow seeking in streams that have no
3654 * keyframes in the conventional sense. It corresponds to the
3655 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
3656 * essential for some types of subtitle streams to ensure that all
3657 * subtitles are correctly displayed after seeking.
3659 int64_t convergence_duration;
3661 // Timestamp generation support:
3663 * Synchronization point for start of timestamp generation.
3665 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
3668 * For example, this corresponds to presence of H.264 buffering period
3674 * Offset of the current timestamp against last timestamp sync point in
3675 * units of AVCodecContext.time_base.
3677 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3678 * contain a valid timestamp offset.
3680 * Note that the timestamp of sync point has usually a nonzero
3681 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
3682 * the next frame after timestamp sync point will be usually 1.
3684 * For example, this corresponds to H.264 cpb_removal_delay.
3686 int dts_ref_dts_delta;
3689 * Presentation delay of current frame in units of AVCodecContext.time_base.
3691 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
3692 * contain valid non-negative timestamp delta (presentation time of a frame
3693 * must not lie in the past).
3695 * This delay represents the difference between decoding and presentation
3696 * time of the frame.
3698 * For example, this corresponds to H.264 dpb_output_delay.
3703 * Position of the packet in file.
3705 * Analogous to cur_frame_pts/dts
3707 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
3710 * Byte position of currently parsed frame in stream.
3715 * Previous frame byte position.
3720 * Duration of the current frame.
3721 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
3722 * For all other types, this is in units of AVCodecContext.time_base.
3726 enum AVFieldOrder field_order;
3729 * Indicate whether a picture is coded as a frame, top field or bottom field.
3731 * For example, H.264 field_pic_flag equal to 0 corresponds to
3732 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
3733 * equal to 1 and bottom_field_flag equal to 0 corresponds to
3734 * AV_PICTURE_STRUCTURE_TOP_FIELD.
3736 enum AVPictureStructure picture_structure;
3739 * Picture number incremented in presentation or output order.
3740 * This field may be reinitialized at the first picture of a new sequence.
3742 * For example, this corresponds to H.264 PicOrderCnt.
3744 int output_picture_number;
3745 } AVCodecParserContext;
3747 typedef struct AVCodecParser {
3748 int codec_ids[5]; /* several codec IDs are permitted */
3750 int (*parser_init)(AVCodecParserContext *s);
3751 int (*parser_parse)(AVCodecParserContext *s,
3752 AVCodecContext *avctx,
3753 const uint8_t **poutbuf, int *poutbuf_size,
3754 const uint8_t *buf, int buf_size);
3755 void (*parser_close)(AVCodecParserContext *s);
3756 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
3757 struct AVCodecParser *next;
3760 AVCodecParser *av_parser_next(AVCodecParser *c);
3762 void av_register_codec_parser(AVCodecParser *parser);
3763 AVCodecParserContext *av_parser_init(int codec_id);
3768 * @param s parser context.
3769 * @param avctx codec context.
3770 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
3771 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
3772 * @param buf input buffer.
3773 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
3774 * @param pts input presentation timestamp.
3775 * @param dts input decoding timestamp.
3776 * @param pos input byte position in stream.
3777 * @return the number of bytes of the input bitstream used.
3782 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
3789 * decode_frame(data, size);
3793 int av_parser_parse2(AVCodecParserContext *s,
3794 AVCodecContext *avctx,
3795 uint8_t **poutbuf, int *poutbuf_size,
3796 const uint8_t *buf, int buf_size,
3797 int64_t pts, int64_t dts,
3801 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
3802 * @deprecated use AVBitstreamFilter
3804 int av_parser_change(AVCodecParserContext *s,
3805 AVCodecContext *avctx,
3806 uint8_t **poutbuf, int *poutbuf_size,
3807 const uint8_t *buf, int buf_size, int keyframe);
3808 void av_parser_close(AVCodecParserContext *s);
3816 * @addtogroup lavc_encoding
3821 * Find a registered encoder with a matching codec ID.
3823 * @param id AVCodecID of the requested encoder
3824 * @return An encoder if one was found, NULL otherwise.
3826 AVCodec *avcodec_find_encoder(enum AVCodecID id);
3829 * Find a registered encoder with the specified name.
3831 * @param name name of the requested encoder
3832 * @return An encoder if one was found, NULL otherwise.
3834 AVCodec *avcodec_find_encoder_by_name(const char *name);
3837 * Encode a frame of audio.
3839 * Takes input samples from frame and writes the next output packet, if
3840 * available, to avpkt. The output packet does not necessarily contain data for
3841 * the most recent frame, as encoders can delay, split, and combine input frames
3842 * internally as needed.
3844 * @param avctx codec context
3845 * @param avpkt output AVPacket.
3846 * The user can supply an output buffer by setting
3847 * avpkt->data and avpkt->size prior to calling the
3848 * function, but if the size of the user-provided data is not
3849 * large enough, encoding will fail. All other AVPacket fields
3850 * will be reset by the encoder using av_init_packet(). If
3851 * avpkt->data is NULL, the encoder will allocate it.
3852 * The encoder will set avpkt->size to the size of the
3855 * If this function fails or produces no output, avpkt will be
3856 * freed using av_free_packet() (i.e. avpkt->destruct will be
3857 * called to free the user supplied buffer).
3858 * @param[in] frame AVFrame containing the raw audio data to be encoded.
3859 * May be NULL when flushing an encoder that has the
3860 * CODEC_CAP_DELAY capability set.
3861 * If CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3862 * can have any number of samples.
3863 * If it is not set, frame->nb_samples must be equal to
3864 * avctx->frame_size for all frames except the last.
3865 * The final frame may be smaller than avctx->frame_size.
3866 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3867 * output packet is non-empty, and to 0 if it is
3868 * empty. If the function returns an error, the
3869 * packet can be assumed to be invalid, and the
3870 * value of got_packet_ptr is undefined and should
3872 * @return 0 on success, negative error code on failure
3874 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
3875 const AVFrame *frame, int *got_packet_ptr);
3878 * Encode a frame of video.
3880 * Takes input raw video data from frame and writes the next output packet, if
3881 * available, to avpkt. The output packet does not necessarily contain data for
3882 * the most recent frame, as encoders can delay and reorder input frames
3883 * internally as needed.
3885 * @param avctx codec context
3886 * @param avpkt output AVPacket.
3887 * The user can supply an output buffer by setting
3888 * avpkt->data and avpkt->size prior to calling the
3889 * function, but if the size of the user-provided data is not
3890 * large enough, encoding will fail. All other AVPacket fields
3891 * will be reset by the encoder using av_init_packet(). If
3892 * avpkt->data is NULL, the encoder will allocate it.
3893 * The encoder will set avpkt->size to the size of the
3894 * output packet. The returned data (if any) belongs to the
3895 * caller, he is responsible for freeing it.
3897 * If this function fails or produces no output, avpkt will be
3898 * freed using av_free_packet() (i.e. avpkt->destruct will be
3899 * called to free the user supplied buffer).
3900 * @param[in] frame AVFrame containing the raw video data to be encoded.
3901 * May be NULL when flushing an encoder that has the
3902 * CODEC_CAP_DELAY capability set.
3903 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
3904 * output packet is non-empty, and to 0 if it is
3905 * empty. If the function returns an error, the
3906 * packet can be assumed to be invalid, and the
3907 * value of got_packet_ptr is undefined and should
3909 * @return 0 on success, negative error code on failure
3911 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
3912 const AVFrame *frame, int *got_packet_ptr);
3914 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
3915 const AVSubtitle *sub);
3923 * @addtogroup lavc_picture
3928 * Allocate memory for a picture. Call avpicture_free() to free it.
3930 * @see avpicture_fill()
3932 * @param picture the picture to be filled in
3933 * @param pix_fmt the format of the picture
3934 * @param width the width of the picture
3935 * @param height the height of the picture
3936 * @return zero if successful, a negative value if not
3938 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
3941 * Free a picture previously allocated by avpicture_alloc().
3942 * The data buffer used by the AVPicture is freed, but the AVPicture structure
3945 * @param picture the AVPicture to be freed
3947 void avpicture_free(AVPicture *picture);
3950 * Fill in the AVPicture fields.
3951 * The fields of the given AVPicture are filled in by using the 'ptr' address
3952 * which points to the image data buffer. Depending on the specified picture
3953 * format, one or multiple image data pointers and line sizes will be set.
3954 * If a planar format is specified, several pointers will be set pointing to
3955 * the different picture planes and the line sizes of the different planes
3956 * will be stored in the lines_sizes array.
3957 * Call with ptr == NULL to get the required size for the ptr buffer.
3959 * To allocate the buffer and fill in the AVPicture fields in one call,
3960 * use avpicture_alloc().
3962 * @param picture AVPicture whose fields are to be filled in
3963 * @param ptr Buffer which will contain or contains the actual image data
3964 * @param pix_fmt The format in which the picture data is stored.
3965 * @param width the width of the image in pixels
3966 * @param height the height of the image in pixels
3967 * @return size of the image data in bytes
3969 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
3970 enum AVPixelFormat pix_fmt, int width, int height);
3973 * Copy pixel data from an AVPicture into a buffer.
3974 * The data is stored compactly, without any gaps for alignment or padding
3975 * which may be applied by avpicture_fill().
3977 * @see avpicture_get_size()
3979 * @param[in] src AVPicture containing image data
3980 * @param[in] pix_fmt The format in which the picture data is stored.
3981 * @param[in] width the width of the image in pixels.
3982 * @param[in] height the height of the image in pixels.
3983 * @param[out] dest A buffer into which picture data will be copied.
3984 * @param[in] dest_size The size of 'dest'.
3985 * @return The number of bytes written to dest, or a negative value (error code) on error.
3987 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
3988 int width, int height,
3989 unsigned char *dest, int dest_size);
3992 * Calculate the size in bytes that a picture of the given width and height
3993 * would occupy if stored in the given picture format.
3994 * Note that this returns the size of a compact representation as generated
3995 * by avpicture_layout(), which can be smaller than the size required for e.g.
3998 * @param pix_fmt the given picture format
3999 * @param width the width of the image
4000 * @param height the height of the image
4001 * @return Image data size in bytes or -1 on error (e.g. too large dimensions).
4003 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4005 #if FF_API_DEINTERLACE
4007 * deinterlace - if not supported return -1
4009 * @deprecated - use yadif (in libavfilter) instead
4011 attribute_deprecated
4012 int avpicture_deinterlace(AVPicture *dst, const AVPicture *src,
4013 enum AVPixelFormat pix_fmt, int width, int height);
4016 * Copy image src to dst. Wraps av_picture_data_copy() above.
4018 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4019 enum AVPixelFormat pix_fmt, int width, int height);
4022 * Crop image top and left side.
4024 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4025 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4030 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4031 int padtop, int padbottom, int padleft, int padright, int *color);
4038 * @defgroup lavc_misc Utility functions
4041 * Miscellaneous utility functions related to both encoding and decoding
4047 * @defgroup lavc_misc_pixfmt Pixel formats
4049 * Functions for working with pixel formats.
4054 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
4057 void attribute_deprecated avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
4060 * Return a value representing the fourCC code associated to the
4061 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4064 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4066 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4067 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4068 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4069 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4070 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4071 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4074 * Compute what kind of losses will occur when converting from one specific
4075 * pixel format to another.
4076 * When converting from one pixel format to another, information loss may occur.
4077 * For example, when converting from RGB24 to GRAY, the color information will
4078 * be lost. Similarly, other losses occur when converting from some formats to
4079 * other formats. These losses can involve loss of chroma, but also loss of
4080 * resolution, loss of color depth, loss due to the color space conversion, loss
4081 * of the alpha bits or loss due to color quantization.
4082 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4083 * which will occur when converting from one pixel format to another.
4085 * @param[in] dst_pix_fmt destination pixel format
4086 * @param[in] src_pix_fmt source pixel format
4087 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4088 * @return Combination of flags informing you what kind of losses will occur.
4090 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4094 * Find the best pixel format to convert to given a certain source pixel
4095 * format. When converting from one pixel format to another, information loss
4096 * may occur. For example, when converting from RGB24 to GRAY, the color
4097 * information will be lost. Similarly, other losses occur when converting from
4098 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4099 * the given pixel formats should be used to suffer the least amount of loss.
4100 * The pixel formats from which it chooses one, are determined by the
4101 * pix_fmt_list parameter.
4104 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4105 * @param[in] src_pix_fmt source pixel format
4106 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4107 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4108 * @return The best pixel format to convert to or -1 if none was found.
4110 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4111 enum AVPixelFormat src_pix_fmt,
4112 int has_alpha, int *loss_ptr);
4114 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4120 #if FF_API_SET_DIMENSIONS
4122 * @deprecated this function is not supposed to be used from outside of lavc
4124 attribute_deprecated
4125 void avcodec_set_dimensions(AVCodecContext *s, int width, int height);
4129 * Put a string representing the codec tag codec_tag in buf.
4131 * @param buf buffer to place codec tag in
4132 * @param buf_size size in bytes of buf
4133 * @param codec_tag codec tag to assign
4134 * @return the length of the string that would have been generated if
4135 * enough space had been available, excluding the trailing null
4137 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4139 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4142 * Return a name for the specified profile, if available.
4144 * @param codec the codec that is searched for the given profile
4145 * @param profile the profile value for which a name is requested
4146 * @return A name for the profile if found, NULL otherwise.
4148 const char *av_get_profile_name(const AVCodec *codec, int profile);
4150 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4151 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4152 //FIXME func typedef
4155 * Fill audio frame data and linesize.
4156 * AVFrame extended_data channel pointers are allocated if necessary for
4159 * @param frame the AVFrame
4160 * frame->nb_samples must be set prior to calling the
4161 * function. This function fills in frame->data,
4162 * frame->extended_data, frame->linesize[0].
4163 * @param nb_channels channel count
4164 * @param sample_fmt sample format
4165 * @param buf buffer to use for frame data
4166 * @param buf_size size of buffer
4167 * @param align plane size sample alignment (0 = default)
4168 * @return 0 on success, negative error code on failure
4170 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4171 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4172 int buf_size, int align);
4175 * Reset the internal decoder state / flush internal buffers. Should be called
4176 * e.g. when seeking or when switching to a different stream.
4178 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4179 * this invalidates the frames previously returned from the decoder. When
4180 * refcounted frames are used, the decoder just releases any references it might
4181 * keep internally, but the caller's reference remains valid.
4183 void avcodec_flush_buffers(AVCodecContext *avctx);
4186 * Return codec bits per sample.
4188 * @param[in] codec_id the codec
4189 * @return Number of bits per sample or zero if unknown for the given codec.
4191 int av_get_bits_per_sample(enum AVCodecID codec_id);
4194 * Return codec bits per sample.
4195 * Only return non-zero if the bits per sample is exactly correct, not an
4198 * @param[in] codec_id the codec
4199 * @return Number of bits per sample or zero if unknown for the given codec.
4201 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
4204 * Return audio frame duration.
4206 * @param avctx codec context
4207 * @param frame_bytes size of the frame, or 0 if unknown
4208 * @return frame duration, in samples, if known. 0 if not able to
4211 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
4214 typedef struct AVBitStreamFilterContext {
4216 struct AVBitStreamFilter *filter;
4217 AVCodecParserContext *parser;
4218 struct AVBitStreamFilterContext *next;
4219 } AVBitStreamFilterContext;
4222 typedef struct AVBitStreamFilter {
4225 int (*filter)(AVBitStreamFilterContext *bsfc,
4226 AVCodecContext *avctx, const char *args,
4227 uint8_t **poutbuf, int *poutbuf_size,
4228 const uint8_t *buf, int buf_size, int keyframe);
4229 void (*close)(AVBitStreamFilterContext *bsfc);
4230 struct AVBitStreamFilter *next;
4231 } AVBitStreamFilter;
4233 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
4234 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
4235 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
4236 AVCodecContext *avctx, const char *args,
4237 uint8_t **poutbuf, int *poutbuf_size,
4238 const uint8_t *buf, int buf_size, int keyframe);
4239 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
4241 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f);
4246 * Allocate a buffer with padding, reusing the given one if large enough.
4248 * Same behaviour av_fast_malloc but the buffer has additional
4249 * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
4252 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
4255 * Encode extradata length to a buffer. Used by xiph codecs.
4257 * @param s buffer to write to; must be at least (v/255+1) bytes long
4258 * @param v size of extradata in bytes
4259 * @return number of bytes written to the buffer.
4261 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
4263 #if FF_API_MISSING_SAMPLE
4265 * Log a generic warning message about a missing feature. This function is
4266 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4267 * only, and would normally not be used by applications.
4268 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4269 * a pointer to an AVClass struct
4270 * @param[in] feature string containing the name of the missing feature
4271 * @param[in] want_sample indicates if samples are wanted which exhibit this feature.
4272 * If want_sample is non-zero, additional verbage will be added to the log
4273 * message which tells the user how to report samples to the development
4275 * @deprecated Use avpriv_report_missing_feature() instead.
4277 attribute_deprecated
4278 void av_log_missing_feature(void *avc, const char *feature, int want_sample);
4281 * Log a generic warning message asking for a sample. This function is
4282 * intended to be used internally by Libav (libavcodec, libavformat, etc.)
4283 * only, and would normally not be used by applications.
4284 * @param[in] avc a pointer to an arbitrary struct of which the first field is
4285 * a pointer to an AVClass struct
4286 * @param[in] msg string containing an optional message, or NULL if no message
4287 * @deprecated Use avpriv_request_sample() instead.
4289 attribute_deprecated
4290 void av_log_ask_for_sample(void *avc, const char *msg, ...) av_printf_format(2, 3);
4291 #endif /* FF_API_MISSING_SAMPLE */
4294 * Register the hardware accelerator hwaccel.
4296 void av_register_hwaccel(AVHWAccel *hwaccel);
4299 * If hwaccel is NULL, returns the first registered hardware accelerator,
4300 * if hwaccel is non-NULL, returns the next registered hardware accelerator
4301 * after hwaccel, or NULL if hwaccel is the last one.
4303 AVHWAccel *av_hwaccel_next(AVHWAccel *hwaccel);
4307 * Lock operation used by lockmgr
4310 AV_LOCK_CREATE, ///< Create a mutex
4311 AV_LOCK_OBTAIN, ///< Lock the mutex
4312 AV_LOCK_RELEASE, ///< Unlock the mutex
4313 AV_LOCK_DESTROY, ///< Free mutex resources
4317 * Register a user provided lock manager supporting the operations
4318 * specified by AVLockOp. mutex points to a (void *) where the
4319 * lockmgr should store/get a pointer to a user allocated mutex. It's
4320 * NULL upon AV_LOCK_CREATE and != NULL for all other ops.
4322 * @param cb User defined callback. Note: Libav may invoke calls to this
4323 * callback during the call to av_lockmgr_register().
4324 * Thus, the application must be prepared to handle that.
4325 * If cb is set to NULL the lockmgr will be unregistered.
4326 * Also note that during unregistration the previously registered
4327 * lockmgr callback may also be invoked.
4329 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
4332 * Get the type of the given codec.
4334 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
4337 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
4338 * with no corresponding avcodec_close()), 0 otherwise.
4340 int avcodec_is_open(AVCodecContext *s);
4343 * @return a non-zero number if codec is an encoder, zero otherwise
4345 int av_codec_is_encoder(const AVCodec *codec);
4348 * @return a non-zero number if codec is a decoder, zero otherwise
4350 int av_codec_is_decoder(const AVCodec *codec);
4353 * @return descriptor for given codec ID or NULL if no descriptor exists.
4355 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
4358 * Iterate over all codec descriptors known to libavcodec.
4360 * @param prev previous descriptor. NULL to get the first descriptor.
4362 * @return next descriptor or NULL after the last descriptor
4364 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
4367 * @return codec descriptor with the given name or NULL if no such descriptor
4370 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
4376 #endif /* AVCODEC_AVCODEC_H */