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_encdec send/receive encoding and decoding API overview
84 * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
85 * avcodec_receive_packet() functions provide an encode/decode API, which
86 * decouples input and output.
88 * The API is very similar for encoding/decoding and audio/video, and works as
90 * - Set up and open the AVCodecContext as usual.
92 * - For decoding, call avcodec_send_packet() to give the decoder raw
93 * compressed data in an AVPacket.
94 * - For encoding, call avcodec_send_frame() to give the decoder an AVFrame
95 * containing uncompressed audio or video.
96 * In both cases, it is recommended that AVPackets and AVFrames are
97 * refcounted, or libavcodec might have to copy the input data. (libavformat
98 * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
99 * refcounted AVFrames.)
100 * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
101 * functions and process their output:
102 * - For decoding, call avcodec_receive_frame(). On success, it will return
103 * an AVFrame containing uncompressed audio or video data.
104 * - For encoding, call avcodec_receive_packet(). On success, it will return
105 * an AVPacket with a compressed frame.
106 * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
107 * AVERROR(EAGAIN) return value means that new input data is required to
108 * return new output. In this case, continue with sending input. For each
109 * input frame/packet, the codec will typically return 1 output frame/packet,
110 * but it can also be 0 or more than 1.
112 * At the beginning of decoding or encoding, the codec might accept multiple
113 * input frames/packets without returning a frame, until its internal buffers
114 * are filled. This situation is handled transparently if you follow the steps
117 * In theory, sending input can result in EAGAIN - this should happen only if
118 * not all output was received. You can use this to structure alternative decode
119 * or encode loops other than the one suggested above. For example, you could
120 * try sending new input on each iteration, and try to receive output if that
123 * End of stream situations. These require "flushing" (aka draining) the codec,
124 * as the codec might buffer multiple frames or packets internally for
125 * performance or out of necessity (consider B-frames).
126 * This is handled as follows:
127 * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
128 * or avcodec_send_frame() (encoding) functions. This will enter draining
130 * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
131 * (encoding) in a loop until AVERROR_EOF is returned. The functions will
132 * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
133 * - Before decoding can be resumed again, the codec has to be reset with
134 * avcodec_flush_buffers().
136 * Using the API as outlined above is highly recommended. But it is also
137 * possible to call functions outside of this rigid schema. For example, you can
138 * call avcodec_send_packet() repeatedly without calling
139 * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
140 * until the codec's internal buffer has been filled up (which is typically of
141 * size 1 per output frame, after initial input), and then reject input with
142 * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
143 * read at least some output.
145 * Not all codecs will follow a rigid and predictable dataflow; the only
146 * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
147 * one end implies that a receive/send call on the other end will succeed. In
148 * general, no codec will permit unlimited buffering of input or output.
150 * This API replaces the following legacy functions:
151 * - avcodec_decode_video2() and avcodec_decode_audio4():
152 * Use avcodec_send_packet() to feed input to the decoder, then use
153 * avcodec_receive_frame() to receive decoded frames after each packet.
154 * Unlike with the old video decoding API, multiple frames might result from
155 * a packet. For audio, splitting the input packet into frames by partially
156 * decoding packets becomes transparent to the API user. You never need to
157 * feed an AVPacket to the API twice (unless it is rejected with EAGAIN - then
158 * no data was read from the packet).
159 * Additionally, sending a flush/draining packet is required only once.
160 * - avcodec_encode_video2()/avcodec_encode_audio2():
161 * Use avcodec_send_frame() to feed input to the encoder, then use
162 * avcodec_receive_packet() to receive encoded packets.
163 * Providing user-allocated buffers for avcodec_receive_packet() is not
165 * - The new API does not handle subtitles yet.
167 * Mixing new and old function calls on the same AVCodecContext is not allowed,
168 * and will result in arbitrary behavior.
170 * Some codecs might require using the new API; using the old API will return
171 * an error when calling it. All codecs support the new API.
173 * A codec is not allowed to return EAGAIN for both sending and receiving. This
174 * would be an invalid state, which could put the codec user into an endless
175 * loop. The API has no concept of time either: it cannot happen that trying to
176 * do avcodec_send_packet() results in EAGAIN, but a repeated call 1 second
177 * later accepts the packet (with no other receive/flush API calls involved).
178 * The API is a strict state machine, and the passage of time is not supposed
179 * to influence it. Some timing-dependent behavior might still be deemed
180 * acceptable in certain cases. But it must never result in both send/receive
181 * returning EAGAIN at the same time at any point. It must also absolutely be
182 * avoided that the current state is "unstable" and can "flip-flop" between
183 * the send/receive APIs allowing progress. For example, it's not allowed that
184 * the codec randomly decides that it actually wants to consume a packet now
185 * instead of returning a frame, after it just returned EAGAIN on an
186 * avcodec_send_packet() call.
191 * @defgroup lavc_core Core functions/structures.
194 * Basic definitions, functions for querying libavcodec capabilities,
195 * allocating core structures, etc.
201 * Identify the syntax and semantics of the bitstream.
202 * The principle is roughly:
203 * Two decoders with the same ID can decode the same streams.
204 * Two encoders with the same ID can encode compatible streams.
205 * There may be slight deviations from the principle due to implementation
208 * If you add a codec ID to this list, add it so that
209 * 1. no value of a existing codec ID changes (that would break ABI),
210 * 2. it is as close as possible to similar codecs.
212 * After adding new codec IDs, do not forget to add an entry to the codec
213 * descriptor list and bump libavcodec minor version.
219 AV_CODEC_ID_MPEG1VIDEO,
220 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
222 AV_CODEC_ID_MPEG2VIDEO_XVMC,
223 #endif /* FF_API_XVMC */
234 AV_CODEC_ID_RAWVIDEO,
235 AV_CODEC_ID_MSMPEG4V1,
236 AV_CODEC_ID_MSMPEG4V2,
237 AV_CODEC_ID_MSMPEG4V3,
260 AV_CODEC_ID_INTERPLAY_VIDEO,
267 AV_CODEC_ID_MSVIDEO1,
272 AV_CODEC_ID_TRUEMOTION1,
273 AV_CODEC_ID_VMDVIDEO,
298 AV_CODEC_ID_TRUEMOTION2,
304 AV_CODEC_ID_SMACKVIDEO,
309 AV_CODEC_ID_JPEG2000,
315 AV_CODEC_ID_DSICINVIDEO,
316 AV_CODEC_ID_TIERTEXSEQVIDEO,
324 AV_CODEC_ID_BETHSOFTVID,
336 AV_CODEC_ID_ESCAPE124,
340 AV_CODEC_ID_MOTIONPIXELS,
352 AV_CODEC_ID_FLASHSV2,
353 AV_CODEC_ID_CDGRAPHICS,
356 AV_CODEC_ID_BINKVIDEO,
357 AV_CODEC_ID_IFF_ILBM,
358 AV_CODEC_ID_IFF_BYTERUN1,
364 AV_CODEC_ID_A64_MULTI,
365 AV_CODEC_ID_A64_MULTI5,
368 AV_CODEC_ID_LAGARITH,
372 AV_CODEC_ID_WMV3IMAGE,
373 AV_CODEC_ID_VC1IMAGE,
375 AV_CODEC_ID_BMV_VIDEO,
382 AV_CODEC_ID_ZEROCODEC,
391 AV_CODEC_ID_ESCAPE130,
394 AV_CODEC_ID_HNM4_VIDEO,
397 AV_CODEC_ID_ALIAS_PIX,
398 AV_CODEC_ID_BRENDER_PIX,
399 AV_CODEC_ID_PAF_VIDEO,
412 AV_CODEC_ID_SCREENPRESSO,
414 AV_CODEC_ID_MAGICYUV,
415 AV_CODEC_ID_TRUEMOTION2RT,
420 /* various PCM "codecs" */
421 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
422 AV_CODEC_ID_PCM_S16LE = 0x10000,
423 AV_CODEC_ID_PCM_S16BE,
424 AV_CODEC_ID_PCM_U16LE,
425 AV_CODEC_ID_PCM_U16BE,
428 AV_CODEC_ID_PCM_MULAW,
429 AV_CODEC_ID_PCM_ALAW,
430 AV_CODEC_ID_PCM_S32LE,
431 AV_CODEC_ID_PCM_S32BE,
432 AV_CODEC_ID_PCM_U32LE,
433 AV_CODEC_ID_PCM_U32BE,
434 AV_CODEC_ID_PCM_S24LE,
435 AV_CODEC_ID_PCM_S24BE,
436 AV_CODEC_ID_PCM_U24LE,
437 AV_CODEC_ID_PCM_U24BE,
438 AV_CODEC_ID_PCM_S24DAUD,
439 AV_CODEC_ID_PCM_ZORK,
440 AV_CODEC_ID_PCM_S16LE_PLANAR,
442 AV_CODEC_ID_PCM_F32BE,
443 AV_CODEC_ID_PCM_F32LE,
444 AV_CODEC_ID_PCM_F64BE,
445 AV_CODEC_ID_PCM_F64LE,
446 AV_CODEC_ID_PCM_BLURAY,
449 AV_CODEC_ID_PCM_S8_PLANAR,
450 AV_CODEC_ID_PCM_S24LE_PLANAR,
451 AV_CODEC_ID_PCM_S32LE_PLANAR,
452 AV_CODEC_ID_PCM_S16BE_PLANAR,
454 /* various ADPCM codecs */
455 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
456 AV_CODEC_ID_ADPCM_IMA_WAV,
457 AV_CODEC_ID_ADPCM_IMA_DK3,
458 AV_CODEC_ID_ADPCM_IMA_DK4,
459 AV_CODEC_ID_ADPCM_IMA_WS,
460 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
461 AV_CODEC_ID_ADPCM_MS,
462 AV_CODEC_ID_ADPCM_4XM,
463 AV_CODEC_ID_ADPCM_XA,
464 AV_CODEC_ID_ADPCM_ADX,
465 AV_CODEC_ID_ADPCM_EA,
466 AV_CODEC_ID_ADPCM_G726,
467 AV_CODEC_ID_ADPCM_CT,
468 AV_CODEC_ID_ADPCM_SWF,
469 AV_CODEC_ID_ADPCM_YAMAHA,
470 AV_CODEC_ID_ADPCM_SBPRO_4,
471 AV_CODEC_ID_ADPCM_SBPRO_3,
472 AV_CODEC_ID_ADPCM_SBPRO_2,
473 AV_CODEC_ID_ADPCM_THP,
474 AV_CODEC_ID_ADPCM_IMA_AMV,
475 AV_CODEC_ID_ADPCM_EA_R1,
476 AV_CODEC_ID_ADPCM_EA_R3,
477 AV_CODEC_ID_ADPCM_EA_R2,
478 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
479 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
480 AV_CODEC_ID_ADPCM_EA_XAS,
481 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
482 AV_CODEC_ID_ADPCM_IMA_ISS,
483 AV_CODEC_ID_ADPCM_G722,
484 AV_CODEC_ID_ADPCM_IMA_APC,
485 AV_CODEC_ID_ADPCM_VIMA,
488 AV_CODEC_ID_AMR_NB = 0x12000,
491 /* RealAudio codecs*/
492 AV_CODEC_ID_RA_144 = 0x13000,
495 /* various DPCM codecs */
496 AV_CODEC_ID_ROQ_DPCM = 0x14000,
497 AV_CODEC_ID_INTERPLAY_DPCM,
498 AV_CODEC_ID_XAN_DPCM,
499 AV_CODEC_ID_SOL_DPCM,
502 AV_CODEC_ID_MP2 = 0x15000,
503 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
513 AV_CODEC_ID_VMDAUDIO,
519 AV_CODEC_ID_WESTWOOD_SND1,
520 AV_CODEC_ID_GSM, ///< as in Berlin toast format
523 AV_CODEC_ID_TRUESPEECH,
525 AV_CODEC_ID_SMACKAUDIO,
528 AV_CODEC_ID_DSICINAUDIO,
530 AV_CODEC_ID_MUSEPACK7,
532 AV_CODEC_ID_GSM_MS, /* as found in WAV */
535 AV_CODEC_ID_NELLYMOSER,
536 AV_CODEC_ID_MUSEPACK8,
538 AV_CODEC_ID_WMAVOICE,
540 AV_CODEC_ID_WMALOSSLESS,
549 AV_CODEC_ID_BINKAUDIO_RDFT,
550 AV_CODEC_ID_BINKAUDIO_DCT,
551 AV_CODEC_ID_AAC_LATM,
556 AV_CODEC_ID_8SVX_EXP,
557 AV_CODEC_ID_8SVX_FIB,
558 AV_CODEC_ID_BMV_AUDIO,
563 AV_CODEC_ID_COMFORT_NOISE,
565 AV_CODEC_ID_METASOUND,
566 AV_CODEC_ID_PAF_AUDIO,
570 /* subtitle codecs */
571 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
572 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
573 AV_CODEC_ID_DVB_SUBTITLE,
574 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
577 AV_CODEC_ID_MOV_TEXT,
578 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
579 AV_CODEC_ID_DVB_TELETEXT,
582 /* other specific kind of codecs (generally used for attachments) */
583 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
584 AV_CODEC_ID_TTF = 0x18000,
586 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
588 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
589 * stream (only used by libavformat) */
590 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
591 * stream (only used by libavformat) */
592 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
593 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
597 * This struct describes the properties of a single codec described by an
599 * @see avcodec_descriptor_get()
601 typedef struct AVCodecDescriptor {
603 enum AVMediaType type;
605 * Name of the codec described by this descriptor. It is non-empty and
606 * unique for each codec descriptor. It should contain alphanumeric
607 * characters and '_' only.
611 * A more descriptive name for this codec. May be NULL.
613 const char *long_name;
615 * Codec properties, a combination of AV_CODEC_PROP_* flags.
619 * If non-NULL, an array of profiles recognized for this codec.
620 * Terminated with FF_PROFILE_UNKNOWN.
622 const struct AVProfile *profiles;
626 * Codec uses only intra compression.
629 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
631 * Codec supports lossy compression. Audio and video codecs only.
632 * @note a codec may support both lossy and lossless
635 #define AV_CODEC_PROP_LOSSY (1 << 1)
637 * Codec supports lossless compression. Audio and video codecs only.
639 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
641 * Codec supports frame reordering. That is, the coded order (the order in which
642 * the encoded packets are output by the encoders / stored / input to the
643 * decoders) may be different from the presentation order of the corresponding
646 * For codecs that do not have this property set, PTS and DTS should always be
649 #define AV_CODEC_PROP_REORDER (1 << 3)
652 * @ingroup lavc_decoding
653 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
654 * This is mainly needed because some optimized bitstream readers read
655 * 32 or 64 bit at once and could read over the end.<br>
656 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
657 * MPEG bitstreams could cause overread and segfault.
659 #define AV_INPUT_BUFFER_PADDING_SIZE 8
662 * @ingroup lavc_encoding
663 * minimum encoding buffer size
664 * Used to avoid some checks during header writing.
666 #define AV_INPUT_BUFFER_MIN_SIZE 16384
668 #if FF_API_WITHOUT_PREFIX
670 * @deprecated use AV_INPUT_BUFFER_PADDING_SIZE instead
672 #define FF_INPUT_BUFFER_PADDING_SIZE 8
675 * @deprecated use AV_INPUT_BUFFER_MIN_SIZE instead
677 #define FF_MIN_BUFFER_SIZE 16384
678 #endif /* FF_API_WITHOUT_PREFIX */
681 * @ingroup lavc_encoding
682 * motion estimation type.
683 * @deprecated use codec private option instead
685 #if FF_API_MOTION_EST
687 ME_ZERO = 1, ///< no search, that is use 0,0 vector whenever one is needed
691 ME_EPZS, ///< enhanced predictive zonal search
692 ME_X1, ///< reserved for experiments
693 ME_HEX, ///< hexagon based search
694 ME_UMH, ///< uneven multi-hexagon search
695 ME_TESA, ///< transformed exhaustive search algorithm
700 * @ingroup lavc_decoding
703 /* We leave some space between them for extensions (drop some
704 * keyframes for intra-only or drop just some bidir frames). */
705 AVDISCARD_NONE =-16, ///< discard nothing
706 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
707 AVDISCARD_NONREF = 8, ///< discard all non reference
708 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
709 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
710 AVDISCARD_ALL = 48, ///< discard all
713 enum AVAudioServiceType {
714 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
715 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
716 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
717 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
718 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
719 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
720 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
721 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
722 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
723 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
727 * @ingroup lavc_encoding
729 typedef struct RcOverride{
732 int qscale; // If this is 0 then quality_factor will be used instead.
733 float quality_factor;
736 #if FF_API_MAX_BFRAMES
738 * @deprecated there is no libavcodec-wide limit on the number of B-frames
740 #define FF_MAX_B_FRAMES 16
744 These flags can be passed in AVCodecContext.flags before initialization.
745 Note: Not everything is supported yet.
749 * Allow decoders to produce frames with data planes that are not aligned
750 * to CPU requirements (e.g. due to cropping).
752 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
756 #define AV_CODEC_FLAG_QSCALE (1 << 1)
758 * 4 MV per MB allowed / advanced prediction for H.263.
760 #define AV_CODEC_FLAG_4MV (1 << 2)
762 * Output even those frames that might be corrupted.
764 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
768 #define AV_CODEC_FLAG_QPEL (1 << 4)
770 * Use internal 2pass ratecontrol in first pass mode.
772 #define AV_CODEC_FLAG_PASS1 (1 << 9)
774 * Use internal 2pass ratecontrol in second pass mode.
776 #define AV_CODEC_FLAG_PASS2 (1 << 10)
780 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
782 * Only decode/encode grayscale.
784 #define AV_CODEC_FLAG_GRAY (1 << 13)
786 * error[?] variables will be set during encoding.
788 #define AV_CODEC_FLAG_PSNR (1 << 15)
790 * Input bitstream might be truncated at a random location
791 * instead of only at frame boundaries.
793 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
795 * Use interlaced DCT.
797 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
801 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
803 * Place global headers in extradata instead of every keyframe.
805 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
807 * Use only bitexact stuff (except (I)DCT).
809 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
810 /* Fx : Flag for H.263+ extra options */
812 * H.263 advanced intra coding / MPEG-4 AC prediction
814 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
816 * interlaced motion estimation
818 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
819 #define AV_CODEC_FLAG_CLOSED_GOP (1 << 31)
822 * Allow non spec compliant speedup tricks.
824 #define AV_CODEC_FLAG2_FAST (1 << 0)
826 * Skip bitstream encoding.
828 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
830 * Place global headers at every keyframe instead of in extradata.
832 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
834 * Input bitstream might be truncated at a packet boundaries
835 * instead of only at frame boundaries.
837 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
839 * Discard cropping information from SPS.
841 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
843 /* Unsupported options :
844 * Syntax Arithmetic coding (SAC)
845 * Reference Picture Selection
846 * Independent Segment Decoding */
848 /* codec capabilities */
851 * Decoder can use draw_horiz_band callback.
853 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
855 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
856 * If not set, it might not use get_buffer() at all or use operations that
857 * assume the buffer was allocated by avcodec_default_get_buffer.
859 #define AV_CODEC_CAP_DR1 (1 << 1)
860 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
862 * Encoder or decoder requires flushing with NULL input at the end in order to
863 * give the complete and correct output.
865 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
866 * with NULL data. The user can still send NULL data to the public encode
867 * or decode function, but libavcodec will not pass it along to the codec
868 * unless this flag is set.
871 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
872 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
876 * The encoder needs to be fed with NULL data at the end of encoding until the
877 * encoder no longer returns data.
879 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
880 * flag also means that the encoder must set the pts and duration for
881 * each output packet. If this flag is not set, the pts and duration will
882 * be determined by libavcodec from the input frame.
884 #define AV_CODEC_CAP_DELAY (1 << 5)
886 * Codec can be fed a final frame with a smaller size.
887 * This can be used to prevent truncation of the last audio samples.
889 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
891 * Codec can output multiple frames per AVPacket
892 * Normally demuxers return one frame at a time, demuxers which do not do
893 * are connected to a parser to split what they return into proper frames.
894 * This flag is reserved to the very rare category of codecs which have a
895 * bitstream that cannot be split into frames without timeconsuming
896 * operations like full decoding. Demuxers carrying such bitstreams thus
897 * may return multiple frames in a packet. This has many disadvantages like
898 * prohibiting stream copy in many cases thus it should only be considered
901 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
903 * Codec is experimental and is thus avoided in favor of non experimental
906 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
908 * Codec should fill in channel configuration and samplerate instead of container
910 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
912 * Codec supports frame-level multithreading.
914 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
916 * Codec supports slice-based (or partition-based) multithreading.
918 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
920 * Codec supports changed parameters at any point.
922 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
924 * Codec supports avctx->thread_count == 0 (auto).
926 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
928 * Audio encoder supports receiving a different number of samples in each call.
930 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
932 #if FF_API_WITHOUT_PREFIX
934 * Allow decoders to produce frames with data planes that are not aligned
935 * to CPU requirements (e.g. due to cropping).
937 #define CODEC_FLAG_UNALIGNED 0x0001
938 #define CODEC_FLAG_QSCALE 0x0002 ///< Use fixed qscale.
939 #define CODEC_FLAG_4MV 0x0004 ///< 4 MV per MB allowed / advanced prediction for H.263.
940 #define CODEC_FLAG_OUTPUT_CORRUPT 0x0008 ///< Output even those frames that might be corrupted
941 #define CODEC_FLAG_QPEL 0x0010 ///< Use qpel MC.
944 * @deprecated use the "gmc" private option of the libxvid encoder
946 #define CODEC_FLAG_GMC 0x0020 ///< Use GMC.
950 * @deprecated use the flag "mv0" in the "mpv_flags" private option of the
953 #define CODEC_FLAG_MV0 0x0040
955 #if FF_API_INPUT_PRESERVED
957 * @deprecated passing reference-counted frames to the encoders replaces this
960 #define CODEC_FLAG_INPUT_PRESERVED 0x0100
962 #define CODEC_FLAG_PASS1 0x0200 ///< Use internal 2pass ratecontrol in first pass mode.
963 #define CODEC_FLAG_PASS2 0x0400 ///< Use internal 2pass ratecontrol in second pass mode.
964 #define CODEC_FLAG_GRAY 0x2000 ///< Only decode/encode grayscale.
967 * @deprecated edges are not used/required anymore. I.e. this flag is now always
970 #define CODEC_FLAG_EMU_EDGE 0x4000
972 #define CODEC_FLAG_PSNR 0x8000 ///< error[?] variables will be set during encoding.
973 #define CODEC_FLAG_TRUNCATED 0x00010000 /** Input bitstream might be truncated at a random
974 location instead of only at frame boundaries. */
975 #if FF_API_NORMALIZE_AQP
977 * @deprecated use the flag "naq" in the "mpv_flags" private option of the
980 #define CODEC_FLAG_NORMALIZE_AQP 0x00020000
982 #define CODEC_FLAG_INTERLACED_DCT 0x00040000 ///< Use interlaced DCT.
983 #define CODEC_FLAG_LOW_DELAY 0x00080000 ///< Force low delay.
984 #define CODEC_FLAG_GLOBAL_HEADER 0x00400000 ///< Place global headers in extradata instead of every keyframe.
985 #define CODEC_FLAG_BITEXACT 0x00800000 ///< Use only bitexact stuff (except (I)DCT).
986 /* Fx : Flag for H.263+ extra options */
987 #define CODEC_FLAG_AC_PRED 0x01000000 ///< H.263 advanced intra coding / MPEG-4 AC prediction
988 #define CODEC_FLAG_LOOP_FILTER 0x00000800 ///< loop filter
989 #define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
990 #define CODEC_FLAG_CLOSED_GOP 0x80000000
991 #define CODEC_FLAG2_FAST 0x00000001 ///< Allow non spec compliant speedup tricks.
992 #define CODEC_FLAG2_NO_OUTPUT 0x00000004 ///< Skip bitstream encoding.
993 #define CODEC_FLAG2_LOCAL_HEADER 0x00000008 ///< Place global headers at every keyframe instead of in extradata.
994 #define CODEC_FLAG2_IGNORE_CROP 0x00010000 ///< Discard cropping information from SPS.
996 #define CODEC_FLAG2_CHUNKS 0x00008000 ///< Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.
998 /* Unsupported options :
999 * Syntax Arithmetic coding (SAC)
1000 * Reference Picture Selection
1001 * Independent Segment Decoding */
1003 /* codec capabilities */
1005 #define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 ///< Decoder can use draw_horiz_band callback.
1007 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
1008 * If not set, it might not use get_buffer() at all or use operations that
1009 * assume the buffer was allocated by avcodec_default_get_buffer.
1011 #define CODEC_CAP_DR1 0x0002
1012 #define CODEC_CAP_TRUNCATED 0x0008
1014 /* Codec can export data for HW decoding (XvMC). */
1015 #define CODEC_CAP_HWACCEL 0x0010
1016 #endif /* FF_API_XVMC */
1018 * Encoder or decoder requires flushing with NULL input at the end in order to
1019 * give the complete and correct output.
1021 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1022 * with NULL data. The user can still send NULL data to the public encode
1023 * or decode function, but libavcodec will not pass it along to the codec
1024 * unless this flag is set.
1027 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1028 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1032 * The encoder needs to be fed with NULL data at the end of encoding until the
1033 * encoder no longer returns data.
1035 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1036 * flag also means that the encoder must set the pts and duration for
1037 * each output packet. If this flag is not set, the pts and duration will
1038 * be determined by libavcodec from the input frame.
1040 #define CODEC_CAP_DELAY 0x0020
1042 * Codec can be fed a final frame with a smaller size.
1043 * This can be used to prevent truncation of the last audio samples.
1045 #define CODEC_CAP_SMALL_LAST_FRAME 0x0040
1047 * Codec can output multiple frames per AVPacket
1048 * Normally demuxers return one frame at a time, demuxers which do not do
1049 * are connected to a parser to split what they return into proper frames.
1050 * This flag is reserved to the very rare category of codecs which have a
1051 * bitstream that cannot be split into frames without timeconsuming
1052 * operations like full decoding. Demuxers carrying such bitstreams thus
1053 * may return multiple frames in a packet. This has many disadvantages like
1054 * prohibiting stream copy in many cases thus it should only be considered
1057 #define CODEC_CAP_SUBFRAMES 0x0100
1059 * Codec is experimental and is thus avoided in favor of non experimental
1062 #define CODEC_CAP_EXPERIMENTAL 0x0200
1064 * Codec should fill in channel configuration and samplerate instead of container
1066 #define CODEC_CAP_CHANNEL_CONF 0x0400
1067 #if FF_API_NEG_LINESIZES
1069 * @deprecated no codecs use this capability
1071 #define CODEC_CAP_NEG_LINESIZES 0x0800
1074 * Codec supports frame-level multithreading.
1076 #define CODEC_CAP_FRAME_THREADS 0x1000
1078 * Codec supports slice-based (or partition-based) multithreading.
1080 #define CODEC_CAP_SLICE_THREADS 0x2000
1082 * Codec supports changed parameters at any point.
1084 #define CODEC_CAP_PARAM_CHANGE 0x4000
1086 * Codec supports avctx->thread_count == 0 (auto).
1088 #define CODEC_CAP_AUTO_THREADS 0x8000
1090 * Audio encoder supports receiving a different number of samples in each call.
1092 #define CODEC_CAP_VARIABLE_FRAME_SIZE 0x10000
1093 #endif /* FF_API_WITHOUT_PREFIX */
1096 //The following defines may change, don't expect compatibility if you use them.
1097 #define MB_TYPE_INTRA4x4 0x0001
1098 #define MB_TYPE_INTRA16x16 0x0002 //FIXME H.264-specific
1099 #define MB_TYPE_INTRA_PCM 0x0004 //FIXME H.264-specific
1100 #define MB_TYPE_16x16 0x0008
1101 #define MB_TYPE_16x8 0x0010
1102 #define MB_TYPE_8x16 0x0020
1103 #define MB_TYPE_8x8 0x0040
1104 #define MB_TYPE_INTERLACED 0x0080
1105 #define MB_TYPE_DIRECT2 0x0100 //FIXME
1106 #define MB_TYPE_ACPRED 0x0200
1107 #define MB_TYPE_GMC 0x0400
1108 #define MB_TYPE_SKIP 0x0800
1109 #define MB_TYPE_P0L0 0x1000
1110 #define MB_TYPE_P1L0 0x2000
1111 #define MB_TYPE_P0L1 0x4000
1112 #define MB_TYPE_P1L1 0x8000
1113 #define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
1114 #define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
1115 #define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
1116 #define MB_TYPE_QUANT 0x00010000
1117 #define MB_TYPE_CBP 0x00020000
1118 // Note bits 24-31 are reserved for codec specific use (H.264 ref0, MPEG-1 0mv, ...)
1123 * This specifies the area which should be displayed.
1124 * Note there may be multiple such areas for one frame.
1126 typedef struct AVPanScan{
1129 * - encoding: Set by user.
1130 * - decoding: Set by libavcodec.
1135 * width and height in 1/16 pel
1136 * - encoding: Set by user.
1137 * - decoding: Set by libavcodec.
1143 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1144 * - encoding: Set by user.
1145 * - decoding: Set by libavcodec.
1147 int16_t position[3][2];
1151 * This structure describes the bitrate properties of an encoded bitstream. It
1152 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1153 * parameters for H.264/HEVC.
1155 typedef struct AVCPBProperties {
1157 * Maximum bitrate of the stream, in bits per second.
1158 * Zero if unknown or unspecified.
1162 * Minimum bitrate of the stream, in bits per second.
1163 * Zero if unknown or unspecified.
1167 * Average bitrate of the stream, in bits per second.
1168 * Zero if unknown or unspecified.
1173 * The size of the buffer to which the ratecontrol is applied, in bits.
1174 * Zero if unknown or unspecified.
1179 * The delay between the time the packet this structure is associated with
1180 * is received and the time when it should be decoded, in periods of a 27MHz
1183 * UINT64_MAX when unknown or unspecified.
1188 #if FF_API_QSCALE_TYPE
1189 #define FF_QSCALE_TYPE_MPEG1 0
1190 #define FF_QSCALE_TYPE_MPEG2 1
1191 #define FF_QSCALE_TYPE_H264 2
1192 #define FF_QSCALE_TYPE_VP56 3
1196 * The decoder will keep a reference to the frame and may reuse it later.
1198 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1201 * @defgroup lavc_packet AVPacket
1203 * Types and functions for working with AVPacket.
1206 enum AVPacketSideDataType {
1208 * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1209 * bytes worth of palette. This side data signals that a new palette is
1212 AV_PKT_DATA_PALETTE,
1215 * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1216 * that the extradata buffer was changed and the receiving side should
1217 * act upon it appropriately. The new extradata is embedded in the side
1218 * data buffer and should be immediately used for processing the current
1221 AV_PKT_DATA_NEW_EXTRADATA,
1224 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1227 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1228 * s32le channel_count
1229 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1230 * u64le channel_layout
1231 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1233 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1238 AV_PKT_DATA_PARAM_CHANGE,
1241 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1242 * structures with info about macroblocks relevant to splitting the
1243 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1244 * That is, it does not necessarily contain info about all macroblocks,
1245 * as long as the distance between macroblocks in the info is smaller
1246 * than the target payload size.
1247 * Each MB info structure is 12 bytes, and is laid out as follows:
1249 * u32le bit offset from the start of the packet
1250 * u8 current quantizer at the start of the macroblock
1252 * u16le macroblock address within the GOB
1253 * u8 horizontal MV predictor
1254 * u8 vertical MV predictor
1255 * u8 horizontal MV predictor for block number 3
1256 * u8 vertical MV predictor for block number 3
1259 AV_PKT_DATA_H263_MB_INFO,
1262 * This side data should be associated with an audio stream and contains
1263 * ReplayGain information in form of the AVReplayGain struct.
1265 AV_PKT_DATA_REPLAYGAIN,
1268 * This side data contains a 3x3 transformation matrix describing an affine
1269 * transformation that needs to be applied to the decoded video frames for
1270 * correct presentation.
1272 * See libavutil/display.h for a detailed description of the data.
1274 AV_PKT_DATA_DISPLAYMATRIX,
1277 * This side data should be associated with a video stream and contains
1278 * Stereoscopic 3D information in form of the AVStereo3D struct.
1280 AV_PKT_DATA_STEREO3D,
1283 * This side data should be associated with an audio stream and corresponds
1284 * to enum AVAudioServiceType.
1286 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1289 * This side data contains an integer value representing the quality
1290 * factor of the compressed frame. Allowed range is between 1 (good)
1291 * and FF_LAMBDA_MAX (bad).
1293 AV_PKT_DATA_QUALITY_FACTOR,
1296 * This side data contains an integer value representing the stream index
1297 * of a "fallback" track. A fallback track indicates an alternate
1298 * track to use when the current track can not be decoded for some reason.
1299 * e.g. no decoder available for codec.
1301 AV_PKT_DATA_FALLBACK_TRACK,
1304 * This side data corresponds to the AVCPBProperties struct.
1306 AV_PKT_DATA_CPB_PROPERTIES,
1309 * This side data should be associated with a video stream and corresponds
1310 * to the AVSphericalMapping structure.
1312 AV_PKT_DATA_SPHERICAL,
1315 typedef struct AVPacketSideData {
1318 enum AVPacketSideDataType type;
1322 * This structure stores compressed data. It is typically exported by demuxers
1323 * and then passed as input to decoders, or received as output from encoders and
1324 * then passed to muxers.
1326 * For video, it should typically contain one compressed frame. For audio it may
1327 * contain several compressed frames. Encoders are allowed to output empty
1328 * packets, with no compressed data, containing only side data
1329 * (e.g. to update some stream parameters at the end of encoding).
1331 * AVPacket is one of the few structs in Libav, whose size is a part of public
1332 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1333 * without libavcodec and libavformat major bump.
1335 * The semantics of data ownership depends on the buf field.
1336 * If it is set, the packet data is dynamically allocated and is
1337 * valid indefinitely until a call to av_packet_unref() reduces the
1338 * reference count to 0.
1340 * If the buf field is not set av_packet_ref() would make a copy instead
1341 * of increasing the reference count.
1343 * The side data is always allocated with av_malloc(), copied by
1344 * av_packet_ref() and freed by av_packet_unref().
1346 * @see av_packet_ref
1347 * @see av_packet_unref
1349 typedef struct AVPacket {
1351 * A reference to the reference-counted buffer where the packet data is
1353 * May be NULL, then the packet data is not reference-counted.
1357 * Presentation timestamp in AVStream->time_base units; the time at which
1358 * the decompressed packet will be presented to the user.
1359 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1360 * pts MUST be larger or equal to dts as presentation cannot happen before
1361 * decompression, unless one wants to view hex dumps. Some formats misuse
1362 * the terms dts and pts/cts to mean something different. Such timestamps
1363 * must be converted to true pts/dts before they are stored in AVPacket.
1367 * Decompression timestamp in AVStream->time_base units; the time at which
1368 * the packet is decompressed.
1369 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1376 * A combination of AV_PKT_FLAG values
1380 * Additional packet data that can be provided by the container.
1381 * Packet can contain several types of side information.
1383 AVPacketSideData *side_data;
1384 int side_data_elems;
1387 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1388 * Equals next_pts - this_pts in presentation order.
1392 int64_t pos; ///< byte position in stream, -1 if unknown
1394 #if FF_API_CONVERGENCE_DURATION
1396 * @deprecated Same as the duration field, but as int64_t. This was required
1397 * for Matroska subtitles, whose duration values could overflow when the
1398 * duration field was still an int.
1400 attribute_deprecated
1401 int64_t convergence_duration;
1404 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1405 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1407 enum AVSideDataParamChangeFlags {
1408 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1409 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1410 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1411 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1417 struct AVCodecInternal;
1421 AV_FIELD_PROGRESSIVE,
1422 AV_FIELD_TT, //< Top coded_first, top displayed first
1423 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1424 AV_FIELD_TB, //< Top coded first, bottom displayed first
1425 AV_FIELD_BT, //< Bottom coded first, top displayed first
1429 * main external API structure.
1430 * New fields can be added to the end with minor version bumps.
1431 * Removal, reordering and changes to existing fields require a major
1433 * sizeof(AVCodecContext) must not be used outside libav*.
1435 typedef struct AVCodecContext {
1437 * information on struct for av_log
1438 * - set by avcodec_alloc_context3
1440 const AVClass *av_class;
1441 int log_level_offset;
1443 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1444 const struct AVCodec *codec;
1445 #if FF_API_CODEC_NAME
1447 * @deprecated this field is not used for anything in libavcodec
1449 attribute_deprecated
1450 char codec_name[32];
1452 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1455 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1456 * This is used to work around some encoder bugs.
1457 * A demuxer should set this to what is stored in the field used to identify the codec.
1458 * If there are multiple such fields in a container then the demuxer should choose the one
1459 * which maximizes the information about the used codec.
1460 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1461 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1462 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1464 * - encoding: Set by user, if not then the default based on codec_id will be used.
1465 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1467 unsigned int codec_tag;
1469 #if FF_API_STREAM_CODEC_TAG
1471 * @deprecated this field is unused
1473 attribute_deprecated
1474 unsigned int stream_codec_tag;
1480 * Private context used for internal data.
1482 * Unlike priv_data, this is not codec-specific. It is used in general
1483 * libavcodec functions.
1485 struct AVCodecInternal *internal;
1488 * Private data of the user, can be used to carry app specific stuff.
1489 * - encoding: Set by user.
1490 * - decoding: Set by user.
1495 * the average bitrate
1496 * - encoding: Set by user; unused for constant quantizer encoding.
1497 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1502 * number of bits the bitstream is allowed to diverge from the reference.
1503 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1504 * - encoding: Set by user; unused for constant quantizer encoding.
1505 * - decoding: unused
1507 int bit_rate_tolerance;
1510 * Global quality for codecs which cannot change it per frame.
1511 * This should be proportional to MPEG-1/2/4 qscale.
1512 * - encoding: Set by user.
1513 * - decoding: unused
1518 * - encoding: Set by user.
1519 * - decoding: unused
1521 int compression_level;
1522 #define FF_COMPRESSION_DEFAULT -1
1526 * - encoding: Set by user.
1527 * - decoding: Set by user.
1533 * - encoding: Set by user.
1534 * - decoding: Set by user.
1539 * some codecs need / can use extradata like Huffman tables.
1540 * MJPEG: Huffman tables
1541 * rv10: additional flags
1542 * MPEG-4: global headers (they can be in the bitstream or here)
1543 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1544 * than extradata_size to avoid problems if it is read with the bitstream reader.
1545 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1546 * - encoding: Set/allocated/freed by libavcodec.
1547 * - decoding: Set/allocated/freed by user.
1553 * This is the fundamental unit of time (in seconds) in terms
1554 * of which frame timestamps are represented. For fixed-fps content,
1555 * timebase should be 1/framerate and timestamp increments should be
1557 * - encoding: MUST be set by user.
1558 * - decoding: the use of this field for decoding is deprecated.
1559 * Use framerate instead.
1561 AVRational time_base;
1564 * For some codecs, the time base is closer to the field rate than the frame rate.
1565 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1566 * if no telecine is used ...
1568 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1570 int ticks_per_frame;
1576 * Number of frames the decoded output will be delayed relative to the
1580 * For encoding, this field is unused (see initial_padding).
1582 * For decoding, this is the number of samples the decoder needs to
1583 * output before the decoder's output is valid. When seeking, you should
1584 * start decoding this many samples prior to your desired seek point.
1586 * - encoding: Set by libavcodec.
1587 * - decoding: Set by libavcodec.
1594 * picture width / height.
1596 * @note Those fields may not match the values of the last
1597 * AVFrame output by avcodec_decode_video2 due frame
1600 * - encoding: MUST be set by user.
1601 * - decoding: May be set by the user before opening the decoder if known e.g.
1602 * from the container. Some decoders will require the dimensions
1603 * to be set by the caller. During decoding, the decoder may
1604 * overwrite those values as required while parsing the data.
1609 * Bitstream width / height, may be different from width/height e.g. when
1610 * the decoded frame is cropped before being output.
1612 * @note Those field may not match the value of the last
1613 * AVFrame output by avcodec_receive_frame() due frame
1616 * - encoding: unused
1617 * - decoding: May be set by the user before opening the decoder if known
1618 * e.g. from the container. During decoding, the decoder may
1619 * overwrite those values as required while parsing the data.
1621 int coded_width, coded_height;
1623 #if FF_API_ASPECT_EXTENDED
1624 #define FF_ASPECT_EXTENDED 15
1628 * the number of pictures in a group of pictures, or 0 for intra_only
1629 * - encoding: Set by user.
1630 * - decoding: unused
1635 * Pixel format, see AV_PIX_FMT_xxx.
1636 * May be set by the demuxer if known from headers.
1637 * May be overridden by the decoder if it knows better.
1639 * @note This field may not match the value of the last
1640 * AVFrame output by avcodec_receive_frame() due frame
1643 * - encoding: Set by user.
1644 * - decoding: Set by user if known, overridden by libavcodec while
1647 enum AVPixelFormat pix_fmt;
1649 #if FF_API_MOTION_EST
1651 * This option does nothing
1652 * @deprecated use codec private options instead
1654 attribute_deprecated int me_method;
1658 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1659 * decoder to draw a horizontal band. It improves cache usage. Not
1660 * all codecs can do that. You must check the codec capabilities
1662 * When multithreading is used, it may be called from multiple threads
1663 * at the same time; threads might draw different parts of the same AVFrame,
1664 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1666 * The function is also used by hardware acceleration APIs.
1667 * It is called at least once during frame decoding to pass
1668 * the data needed for hardware render.
1669 * In that mode instead of pixel data, AVFrame points to
1670 * a structure specific to the acceleration API. The application
1671 * reads the structure and can change some fields to indicate progress
1673 * - encoding: unused
1674 * - decoding: Set by user.
1675 * @param height the height of the slice
1676 * @param y the y position of the slice
1677 * @param type 1->top field, 2->bottom field, 3->frame
1678 * @param offset offset into the AVFrame.data from which the slice should be read
1680 void (*draw_horiz_band)(struct AVCodecContext *s,
1681 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1682 int y, int type, int height);
1685 * callback to negotiate the pixelFormat
1686 * @param fmt is the list of formats which are supported by the codec,
1687 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1688 * The first is always the native one.
1689 * @note The callback may be called again immediately if initialization for
1690 * the selected (hardware-accelerated) pixel format failed.
1691 * @warning Behavior is undefined if the callback returns a value not
1692 * in the fmt list of formats.
1693 * @return the chosen format
1694 * - encoding: unused
1695 * - decoding: Set by user, if not set the native format will be chosen.
1697 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1700 * maximum number of B-frames between non-B-frames
1701 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1702 * - encoding: Set by user.
1703 * - decoding: unused
1708 * qscale factor between IP and B-frames
1709 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1710 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1711 * - encoding: Set by user.
1712 * - decoding: unused
1714 float b_quant_factor;
1716 #if FF_API_RC_STRATEGY
1717 /** @deprecated use codec private option instead */
1718 attribute_deprecated int rc_strategy;
1719 #define FF_RC_STRATEGY_XVID 1
1722 #if FF_API_PRIVATE_OPT
1723 /** @deprecated use encoder private options instead */
1724 attribute_deprecated
1725 int b_frame_strategy;
1729 * qscale offset between IP and B-frames
1730 * - encoding: Set by user.
1731 * - decoding: unused
1733 float b_quant_offset;
1736 * Size of the frame reordering buffer in the decoder.
1737 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1738 * - encoding: Set by libavcodec.
1739 * - decoding: Set by libavcodec.
1743 #if FF_API_PRIVATE_OPT
1744 /** @deprecated use encoder private options instead */
1745 attribute_deprecated
1750 * qscale factor between P- and I-frames
1751 * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
1752 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1753 * - encoding: Set by user.
1754 * - decoding: unused
1756 float i_quant_factor;
1759 * qscale offset between P and I-frames
1760 * - encoding: Set by user.
1761 * - decoding: unused
1763 float i_quant_offset;
1766 * luminance masking (0-> disabled)
1767 * - encoding: Set by user.
1768 * - decoding: unused
1773 * temporary complexity masking (0-> disabled)
1774 * - encoding: Set by user.
1775 * - decoding: unused
1777 float temporal_cplx_masking;
1780 * spatial complexity masking (0-> disabled)
1781 * - encoding: Set by user.
1782 * - decoding: unused
1784 float spatial_cplx_masking;
1787 * p block masking (0-> disabled)
1788 * - encoding: Set by user.
1789 * - decoding: unused
1794 * darkness masking (0-> disabled)
1795 * - encoding: Set by user.
1796 * - decoding: unused
1802 * - encoding: Set by libavcodec.
1803 * - decoding: Set by user (or 0).
1807 #if FF_API_PRIVATE_OPT
1808 /** @deprecated use encoder private options instead */
1809 attribute_deprecated
1810 int prediction_method;
1811 #define FF_PRED_LEFT 0
1812 #define FF_PRED_PLANE 1
1813 #define FF_PRED_MEDIAN 2
1817 * slice offsets in the frame in bytes
1818 * - encoding: Set/allocated by libavcodec.
1819 * - decoding: Set/allocated by user (or NULL).
1824 * sample aspect ratio (0 if unknown)
1825 * That is the width of a pixel divided by the height of the pixel.
1826 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1827 * - encoding: Set by user.
1828 * - decoding: Set by libavcodec.
1830 AVRational sample_aspect_ratio;
1833 * motion estimation comparison function
1834 * - encoding: Set by user.
1835 * - decoding: unused
1839 * subpixel motion estimation comparison function
1840 * - encoding: Set by user.
1841 * - decoding: unused
1845 * macroblock comparison function (not supported yet)
1846 * - encoding: Set by user.
1847 * - decoding: unused
1851 * interlaced DCT comparison function
1852 * - encoding: Set by user.
1853 * - decoding: unused
1856 #define FF_CMP_SAD 0
1857 #define FF_CMP_SSE 1
1858 #define FF_CMP_SATD 2
1859 #define FF_CMP_DCT 3
1860 #define FF_CMP_PSNR 4
1861 #define FF_CMP_BIT 5
1863 #define FF_CMP_ZERO 7
1864 #define FF_CMP_VSAD 8
1865 #define FF_CMP_VSSE 9
1866 #define FF_CMP_NSSE 10
1867 #define FF_CMP_DCTMAX 13
1868 #define FF_CMP_DCT264 14
1869 #define FF_CMP_CHROMA 256
1872 * ME diamond size & shape
1873 * - encoding: Set by user.
1874 * - decoding: unused
1879 * amount of previous MV predictors (2a+1 x 2a+1 square)
1880 * - encoding: Set by user.
1881 * - decoding: unused
1883 int last_predictor_count;
1885 #if FF_API_PRIVATE_OPT
1886 /** @deprecated use encoder private options instead */
1887 attribute_deprecated
1892 * motion estimation prepass comparison function
1893 * - encoding: Set by user.
1894 * - decoding: unused
1899 * ME prepass diamond size & shape
1900 * - encoding: Set by user.
1901 * - decoding: unused
1907 * - encoding: Set by user.
1908 * - decoding: unused
1910 int me_subpel_quality;
1914 * DTG active format information (additional aspect ratio
1915 * information only used in DVB MPEG-2 transport streams)
1918 * - encoding: unused
1919 * - decoding: Set by decoder.
1920 * @deprecated Deprecated in favor of AVSideData
1922 attribute_deprecated int dtg_active_format;
1923 #define FF_DTG_AFD_SAME 8
1924 #define FF_DTG_AFD_4_3 9
1925 #define FF_DTG_AFD_16_9 10
1926 #define FF_DTG_AFD_14_9 11
1927 #define FF_DTG_AFD_4_3_SP_14_9 13
1928 #define FF_DTG_AFD_16_9_SP_14_9 14
1929 #define FF_DTG_AFD_SP_4_3 15
1930 #endif /* FF_API_AFD */
1933 * maximum motion estimation search range in subpel units
1934 * If 0 then no limit.
1936 * - encoding: Set by user.
1937 * - decoding: unused
1941 #if FF_API_QUANT_BIAS
1943 * @deprecated use encoder private option instead
1945 attribute_deprecated int intra_quant_bias;
1946 #define FF_DEFAULT_QUANT_BIAS 999999
1949 * @deprecated use encoder private option instead
1951 attribute_deprecated int inter_quant_bias;
1956 * - encoding: unused
1957 * - decoding: Set by user.
1960 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1961 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
1962 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1966 * XVideo Motion Acceleration
1967 * - encoding: forbidden
1968 * - decoding: set by decoder
1969 * @deprecated XvMC support is slated for removal.
1971 attribute_deprecated int xvmc_acceleration;
1972 #endif /* FF_API_XVMC */
1975 * macroblock decision mode
1976 * - encoding: Set by user.
1977 * - decoding: unused
1980 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1981 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1982 #define FF_MB_DECISION_RD 2 ///< rate distortion
1985 * custom intra quantization matrix
1986 * - encoding: Set by user, can be NULL.
1987 * - decoding: Set by libavcodec.
1989 uint16_t *intra_matrix;
1992 * custom inter quantization matrix
1993 * - encoding: Set by user, can be NULL.
1994 * - decoding: Set by libavcodec.
1996 uint16_t *inter_matrix;
1998 #if FF_API_PRIVATE_OPT
1999 /** @deprecated use encoder private options instead */
2000 attribute_deprecated
2001 int scenechange_threshold;
2003 /** @deprecated use encoder private options instead */
2004 attribute_deprecated
2005 int noise_reduction;
2010 * @deprecated this field is unused
2012 attribute_deprecated
2016 * @deprecated this field is unused
2018 attribute_deprecated
2023 * precision of the intra DC coefficient - 8
2024 * - encoding: Set by user.
2025 * - decoding: unused
2027 int intra_dc_precision;
2030 * Number of macroblock rows at the top which are skipped.
2031 * - encoding: unused
2032 * - decoding: Set by user.
2037 * Number of macroblock rows at the bottom which are skipped.
2038 * - encoding: unused
2039 * - decoding: Set by user.
2045 * @deprecated use encoder private options instead
2047 attribute_deprecated
2048 float border_masking;
2052 * minimum MB Lagrange multiplier
2053 * - encoding: Set by user.
2054 * - decoding: unused
2059 * maximum MB Lagrange multiplier
2060 * - encoding: Set by user.
2061 * - decoding: unused
2065 #if FF_API_PRIVATE_OPT
2067 * @deprecated use encoder private options instead
2069 attribute_deprecated
2070 int me_penalty_compensation;
2074 * - encoding: Set by user.
2075 * - decoding: unused
2079 #if FF_API_PRIVATE_OPT
2080 /** @deprecated use encoder private options instead */
2081 attribute_deprecated
2087 * - encoding: Set by user.
2088 * - decoding: unused
2093 * number of reference frames
2094 * - encoding: Set by user.
2095 * - decoding: Set by lavc.
2099 #if FF_API_PRIVATE_OPT
2100 /** @deprecated use encoder private options instead */
2101 attribute_deprecated
2105 #if FF_API_UNUSED_MEMBERS
2107 * Multiplied by qscale for each frame and added to scene_change_score.
2108 * - encoding: Set by user.
2109 * - decoding: unused
2111 attribute_deprecated int scenechange_factor;
2115 * Note: Value depends upon the compare function used for fullpel ME.
2116 * - encoding: Set by user.
2117 * - decoding: unused
2121 #if FF_API_PRIVATE_OPT
2122 /** @deprecated use encoder private options instead */
2123 attribute_deprecated
2128 * Chromaticity coordinates of the source primaries.
2129 * - encoding: Set by user
2130 * - decoding: Set by libavcodec
2132 enum AVColorPrimaries color_primaries;
2135 * Color Transfer Characteristic.
2136 * - encoding: Set by user
2137 * - decoding: Set by libavcodec
2139 enum AVColorTransferCharacteristic color_trc;
2142 * YUV colorspace type.
2143 * - encoding: Set by user
2144 * - decoding: Set by libavcodec
2146 enum AVColorSpace colorspace;
2149 * MPEG vs JPEG YUV range.
2150 * - encoding: Set by user
2151 * - decoding: Set by libavcodec
2153 enum AVColorRange color_range;
2156 * This defines the location of chroma samples.
2157 * - encoding: Set by user
2158 * - decoding: Set by libavcodec
2160 enum AVChromaLocation chroma_sample_location;
2164 * Indicates number of picture subdivisions. Used for parallelized
2166 * - encoding: Set by user
2167 * - decoding: unused
2172 * - encoding: set by libavcodec
2173 * - decoding: Set by libavcodec
2175 enum AVFieldOrder field_order;
2178 int sample_rate; ///< samples per second
2179 int channels; ///< number of audio channels
2182 * audio sample format
2183 * - encoding: Set by user.
2184 * - decoding: Set by libavcodec.
2186 enum AVSampleFormat sample_fmt; ///< sample format
2188 /* The following data should not be initialized. */
2190 * Number of samples per channel in an audio frame.
2192 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2193 * except the last must contain exactly frame_size samples per channel.
2194 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2195 * frame size is not restricted.
2196 * - decoding: may be set by some decoders to indicate constant frame size
2201 * Frame counter, set by libavcodec.
2203 * - decoding: total number of frames returned from the decoder so far.
2204 * - encoding: total number of frames passed to the encoder so far.
2206 * @note the counter is not incremented if encoding/decoding resulted in
2212 * number of bytes per packet if constant and known or 0
2213 * Used by some WAV based audio codecs.
2218 * Audio cutoff bandwidth (0 means "automatic")
2219 * - encoding: Set by user.
2220 * - decoding: unused
2225 * Audio channel layout.
2226 * - encoding: set by user.
2227 * - decoding: set by libavcodec.
2229 uint64_t channel_layout;
2232 * Request decoder to use this channel layout if it can (0 for default)
2233 * - encoding: unused
2234 * - decoding: Set by user.
2236 uint64_t request_channel_layout;
2239 * Type of service that the audio stream conveys.
2240 * - encoding: Set by user.
2241 * - decoding: Set by libavcodec.
2243 enum AVAudioServiceType audio_service_type;
2246 * Used to request a sample format from the decoder.
2247 * - encoding: unused.
2248 * - decoding: Set by user.
2250 enum AVSampleFormat request_sample_fmt;
2253 * This callback is called at the beginning of each frame to get data
2254 * buffer(s) for it. There may be one contiguous buffer for all the data or
2255 * there may be a buffer per each data plane or anything in between. What
2256 * this means is, you may set however many entries in buf[] you feel necessary.
2257 * Each buffer must be reference-counted using the AVBuffer API (see description
2260 * The following fields will be set in the frame before this callback is
2263 * - width, height (video only)
2264 * - sample_rate, channel_layout, nb_samples (audio only)
2265 * Their values may differ from the corresponding values in
2266 * AVCodecContext. This callback must use the frame values, not the codec
2267 * context values, to calculate the required buffer size.
2269 * This callback must fill the following fields in the frame:
2273 * * if the data is planar audio with more than 8 channels, then this
2274 * callback must allocate and fill extended_data to contain all pointers
2275 * to all data planes. data[] must hold as many pointers as it can.
2276 * extended_data must be allocated with av_malloc() and will be freed in
2278 * * otherwise extended_data must point to data
2279 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2280 * the frame's data and extended_data pointers must be contained in these. That
2281 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2282 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2283 * and av_buffer_ref().
2284 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2285 * this callback and filled with the extra buffers if there are more
2286 * buffers than buf[] can hold. extended_buf will be freed in
2289 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2290 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2293 * Each data plane must be aligned to the maximum required by the target
2296 * @see avcodec_default_get_buffer2()
2300 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2301 * (read and/or written to if it is writable) later by libavcodec.
2303 * avcodec_align_dimensions2() should be used to find the required width and
2304 * height, as they normally need to be rounded up to the next multiple of 16.
2306 * If frame multithreading is used and thread_safe_callbacks is set,
2307 * this callback may be called from a different thread, but not from more
2308 * than one at once. Does not need to be reentrant.
2310 * @see avcodec_align_dimensions2()
2314 * Decoders request a buffer of a particular size by setting
2315 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2316 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2317 * to a smaller value in the output frame.
2319 * As a convenience, av_samples_get_buffer_size() and
2320 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2321 * functions to find the required data size and to fill data pointers and
2322 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2323 * since all planes must be the same size.
2325 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2327 * - encoding: unused
2328 * - decoding: Set by libavcodec, user can override.
2330 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2333 * If non-zero, the decoded audio and video frames returned from
2334 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2335 * and are valid indefinitely. The caller must free them with
2336 * av_frame_unref() when they are not needed anymore.
2337 * Otherwise, the decoded frames must not be freed by the caller and are
2338 * only valid until the next decode call.
2340 * This is always automatically enabled if avcodec_receive_frame() is used.
2342 * - encoding: unused
2343 * - decoding: set by the caller before avcodec_open2().
2345 attribute_deprecated int refcounted_frames;
2347 /* - encoding parameters */
2348 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2349 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2353 * - encoding: Set by user.
2354 * - decoding: unused
2360 * - encoding: Set by user.
2361 * - decoding: unused
2366 * maximum quantizer difference between frames
2367 * - encoding: Set by user.
2368 * - decoding: unused
2374 * @deprecated use encoder private options instead
2376 attribute_deprecated
2379 attribute_deprecated
2381 attribute_deprecated
2386 * decoder bitstream buffer size
2387 * - encoding: Set by user.
2388 * - decoding: unused
2393 * ratecontrol override, see RcOverride
2394 * - encoding: Allocated/set/freed by user.
2395 * - decoding: unused
2397 int rc_override_count;
2398 RcOverride *rc_override;
2402 * @deprecated use encoder private options instead
2404 attribute_deprecated
2410 * - encoding: Set by user.
2411 * - decoding: unused
2417 * - encoding: Set by user.
2418 * - decoding: unused
2424 * @deprecated use encoder private options instead
2426 attribute_deprecated
2427 float rc_buffer_aggressivity;
2429 attribute_deprecated
2430 float rc_initial_cplx;
2434 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2435 * - encoding: Set by user.
2436 * - decoding: unused.
2438 float rc_max_available_vbv_use;
2441 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2442 * - encoding: Set by user.
2443 * - decoding: unused.
2445 float rc_min_vbv_overflow_use;
2448 * Number of bits which should be loaded into the rc buffer before decoding starts.
2449 * - encoding: Set by user.
2450 * - decoding: unused
2452 int rc_initial_buffer_occupancy;
2454 #if FF_API_CODER_TYPE
2455 #define FF_CODER_TYPE_VLC 0
2456 #define FF_CODER_TYPE_AC 1
2457 #define FF_CODER_TYPE_RAW 2
2458 #define FF_CODER_TYPE_RLE 3
2459 #if FF_API_UNUSED_MEMBERS
2460 #define FF_CODER_TYPE_DEFLATE 4
2461 #endif /* FF_API_UNUSED_MEMBERS */
2463 * @deprecated use encoder private options instead
2465 attribute_deprecated
2467 #endif /* FF_API_CODER_TYPE */
2469 #if FF_API_PRIVATE_OPT
2470 /** @deprecated use encoder private options instead */
2471 attribute_deprecated
2477 * @deprecated use encoder private options instead
2479 attribute_deprecated
2483 * @deprecated use encoder private options instead
2485 attribute_deprecated
2489 #if FF_API_PRIVATE_OPT
2490 /** @deprecated use encoder private options instead */
2491 attribute_deprecated
2492 int frame_skip_threshold;
2494 /** @deprecated use encoder private options instead */
2495 attribute_deprecated
2496 int frame_skip_factor;
2498 /** @deprecated use encoder private options instead */
2499 attribute_deprecated
2502 /** @deprecated use encoder private options instead */
2503 attribute_deprecated
2505 #endif /* FF_API_PRIVATE_OPT */
2508 * trellis RD quantization
2509 * - encoding: Set by user.
2510 * - decoding: unused
2514 #if FF_API_PRIVATE_OPT
2515 /** @deprecated use encoder private options instead */
2516 attribute_deprecated
2517 int min_prediction_order;
2519 /** @deprecated use encoder private options instead */
2520 attribute_deprecated
2521 int max_prediction_order;
2523 /** @deprecated use encoder private options instead */
2524 attribute_deprecated
2525 int64_t timecode_frame_start;
2528 #if FF_API_RTP_CALLBACK
2530 * @deprecated unused
2532 /* The RTP callback: This function is called */
2533 /* every time the encoder has a packet to send. */
2534 /* It depends on the encoder if the data starts */
2535 /* with a Start Code (it should). H.263 does. */
2536 /* mb_nb contains the number of macroblocks */
2537 /* encoded in the RTP payload. */
2538 attribute_deprecated
2539 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2542 #if FF_API_PRIVATE_OPT
2543 /** @deprecated use encoder private options instead */
2544 attribute_deprecated
2545 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2546 /* do its best to deliver a chunk with size */
2547 /* below rtp_payload_size, the chunk will start */
2548 /* with a start code on some codecs like H.263. */
2549 /* This doesn't take account of any particular */
2550 /* headers inside the transmitted RTP payload. */
2553 #if FF_API_STAT_BITS
2554 /* statistics, used for 2-pass encoding */
2555 attribute_deprecated
2557 attribute_deprecated
2559 attribute_deprecated
2561 attribute_deprecated
2563 attribute_deprecated
2565 attribute_deprecated
2567 attribute_deprecated
2569 attribute_deprecated
2572 /** @deprecated this field is unused */
2573 attribute_deprecated
2578 * pass1 encoding statistics output buffer
2579 * - encoding: Set by libavcodec.
2580 * - decoding: unused
2585 * pass2 encoding statistics input buffer
2586 * Concatenated stuff from stats_out of pass1 should be placed here.
2587 * - encoding: Allocated/set/freed by user.
2588 * - decoding: unused
2593 * Work around bugs in encoders which sometimes cannot be detected automatically.
2594 * - encoding: Set by user
2595 * - decoding: Set by user
2597 int workaround_bugs;
2598 #define FF_BUG_AUTODETECT 1 ///< autodetection
2599 #if FF_API_OLD_MSMPEG4
2600 #define FF_BUG_OLD_MSMPEG4 2
2602 #define FF_BUG_XVID_ILACE 4
2603 #define FF_BUG_UMP4 8
2604 #define FF_BUG_NO_PADDING 16
2605 #define FF_BUG_AMV 32
2607 #define FF_BUG_AC_VLC 0 ///< Will be removed, libavcodec can now handle these non-compliant files by default.
2609 #define FF_BUG_QPEL_CHROMA 64
2610 #define FF_BUG_STD_QPEL 128
2611 #define FF_BUG_QPEL_CHROMA2 256
2612 #define FF_BUG_DIRECT_BLOCKSIZE 512
2613 #define FF_BUG_EDGE 1024
2614 #define FF_BUG_HPEL_CHROMA 2048
2615 #define FF_BUG_DC_CLIP 4096
2616 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2617 #define FF_BUG_TRUNCATED 16384
2620 * strictly follow the standard (MPEG-4, ...).
2621 * - encoding: Set by user.
2622 * - decoding: Set by user.
2623 * Setting this to STRICT or higher means the encoder and decoder will
2624 * generally do stupid things, whereas setting it to unofficial or lower
2625 * will mean the encoder might produce output that is not supported by all
2626 * spec-compliant decoders. Decoders don't differentiate between normal,
2627 * unofficial and experimental (that is, they always try to decode things
2628 * when they can) unless they are explicitly asked to behave stupidly
2629 * (=strictly conform to the specs)
2631 int strict_std_compliance;
2632 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2633 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2634 #define FF_COMPLIANCE_NORMAL 0
2635 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2636 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2639 * error concealment flags
2640 * - encoding: unused
2641 * - decoding: Set by user.
2643 int error_concealment;
2644 #define FF_EC_GUESS_MVS 1
2645 #define FF_EC_DEBLOCK 2
2649 * - encoding: Set by user.
2650 * - decoding: Set by user.
2653 #define FF_DEBUG_PICT_INFO 1
2654 #define FF_DEBUG_RC 2
2655 #define FF_DEBUG_BITSTREAM 4
2656 #define FF_DEBUG_MB_TYPE 8
2657 #define FF_DEBUG_QP 16
2660 * @deprecated this option does nothing
2662 #define FF_DEBUG_MV 32
2664 #define FF_DEBUG_DCT_COEFF 0x00000040
2665 #define FF_DEBUG_SKIP 0x00000080
2666 #define FF_DEBUG_STARTCODE 0x00000100
2667 #if FF_API_UNUSED_MEMBERS
2668 #define FF_DEBUG_PTS 0x00000200
2669 #endif /* FF_API_UNUSED_MEMBERS */
2670 #define FF_DEBUG_ER 0x00000400
2671 #define FF_DEBUG_MMCO 0x00000800
2672 #define FF_DEBUG_BUGS 0x00001000
2674 #define FF_DEBUG_VIS_QP 0x00002000
2675 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2677 #define FF_DEBUG_BUFFERS 0x00008000
2678 #define FF_DEBUG_THREADS 0x00010000
2682 * @deprecated this option does not have any effect
2684 attribute_deprecated
2686 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
2687 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
2688 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
2692 * Error recognition; may misdetect some more or less valid parts as errors.
2693 * - encoding: unused
2694 * - decoding: Set by user.
2696 int err_recognition;
2699 * Verify checksums embedded in the bitstream (could be of either encoded or
2700 * decoded data, depending on the codec) and print an error message on mismatch.
2701 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2702 * decoder returning an error.
2704 #define AV_EF_CRCCHECK (1<<0)
2705 #define AV_EF_BITSTREAM (1<<1)
2706 #define AV_EF_BUFFER (1<<2)
2707 #define AV_EF_EXPLODE (1<<3)
2710 * opaque 64-bit number (generally a PTS) that will be reordered and
2711 * output in AVFrame.reordered_opaque
2712 * - encoding: unused
2713 * - decoding: Set by user.
2715 int64_t reordered_opaque;
2718 * Hardware accelerator in use
2719 * - encoding: unused.
2720 * - decoding: Set by libavcodec
2722 struct AVHWAccel *hwaccel;
2725 * Hardware accelerator context.
2726 * For some hardware accelerators, a global context needs to be
2727 * provided by the user. In that case, this holds display-dependent
2728 * data Libav cannot instantiate itself. Please refer to the
2729 * Libav HW accelerator documentation to know how to fill this
2730 * is. e.g. for VA API, this is a struct vaapi_context.
2731 * - encoding: unused
2732 * - decoding: Set by user
2734 void *hwaccel_context;
2738 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2739 * - decoding: unused
2741 uint64_t error[AV_NUM_DATA_POINTERS];
2744 * DCT algorithm, see FF_DCT_* below
2745 * - encoding: Set by user.
2746 * - decoding: unused
2749 #define FF_DCT_AUTO 0
2750 #define FF_DCT_FASTINT 1
2751 #define FF_DCT_INT 2
2752 #define FF_DCT_MMX 3
2753 #define FF_DCT_ALTIVEC 5
2754 #define FF_DCT_FAAN 6
2757 * IDCT algorithm, see FF_IDCT_* below.
2758 * - encoding: Set by user.
2759 * - decoding: Set by user.
2762 #define FF_IDCT_AUTO 0
2763 #define FF_IDCT_INT 1
2764 #define FF_IDCT_SIMPLE 2
2765 #define FF_IDCT_SIMPLEMMX 3
2766 #define FF_IDCT_ARM 7
2767 #define FF_IDCT_ALTIVEC 8
2769 #define FF_IDCT_SH4 9
2771 #define FF_IDCT_SIMPLEARM 10
2772 #if FF_API_UNUSED_MEMBERS
2773 #define FF_IDCT_IPP 13
2774 #endif /* FF_API_UNUSED_MEMBERS */
2775 #define FF_IDCT_XVID 14
2776 #if FF_API_IDCT_XVIDMMX
2777 #define FF_IDCT_XVIDMMX 14
2778 #endif /* FF_API_IDCT_XVIDMMX */
2779 #define FF_IDCT_SIMPLEARMV5TE 16
2780 #define FF_IDCT_SIMPLEARMV6 17
2781 #if FF_API_ARCH_SPARC
2782 #define FF_IDCT_SIMPLEVIS 18
2784 #define FF_IDCT_FAAN 20
2785 #define FF_IDCT_SIMPLENEON 22
2786 #if FF_API_ARCH_ALPHA
2787 #define FF_IDCT_SIMPLEALPHA 23
2791 * bits per sample/pixel from the demuxer (needed for huffyuv).
2792 * - encoding: Set by libavcodec.
2793 * - decoding: Set by user.
2795 int bits_per_coded_sample;
2798 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2799 * - encoding: set by user.
2800 * - decoding: set by libavcodec.
2802 int bits_per_raw_sample;
2804 #if FF_API_CODED_FRAME
2806 * the picture in the bitstream
2807 * - encoding: Set by libavcodec.
2808 * - decoding: unused
2810 * @deprecated use the quality factor packet side data instead
2812 attribute_deprecated AVFrame *coded_frame;
2817 * is used to decide how many independent tasks should be passed to execute()
2818 * - encoding: Set by user.
2819 * - decoding: Set by user.
2824 * Which multithreading methods to use.
2825 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2826 * so clients which cannot provide future frames should not use it.
2828 * - encoding: Set by user, otherwise the default is used.
2829 * - decoding: Set by user, otherwise the default is used.
2832 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2833 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2836 * Which multithreading methods are in use by the codec.
2837 * - encoding: Set by libavcodec.
2838 * - decoding: Set by libavcodec.
2840 int active_thread_type;
2843 * Set by the client if its custom get_buffer() callback can be called
2844 * synchronously from another thread, which allows faster multithreaded decoding.
2845 * draw_horiz_band() will be called from other threads regardless of this setting.
2846 * Ignored if the default get_buffer() is used.
2847 * - encoding: Set by user.
2848 * - decoding: Set by user.
2850 int thread_safe_callbacks;
2853 * The codec may call this to execute several independent things.
2854 * It will return only after finishing all tasks.
2855 * The user may replace this with some multithreaded implementation,
2856 * the default implementation will execute the parts serially.
2857 * @param count the number of things to execute
2858 * - encoding: Set by libavcodec, user can override.
2859 * - decoding: Set by libavcodec, user can override.
2861 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2864 * The codec may call this to execute several independent things.
2865 * It will return only after finishing all tasks.
2866 * The user may replace this with some multithreaded implementation,
2867 * the default implementation will execute the parts serially.
2868 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2869 * @param c context passed also to func
2870 * @param count the number of things to execute
2871 * @param arg2 argument passed unchanged to func
2872 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2873 * @param func function that will be called count times, with jobnr from 0 to count-1.
2874 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2875 * two instances of func executing at the same time will have the same threadnr.
2876 * @return always 0 currently, but code should handle a future improvement where when any call to func
2877 * returns < 0 no further calls to func may be done and < 0 is returned.
2878 * - encoding: Set by libavcodec, user can override.
2879 * - decoding: Set by libavcodec, user can override.
2881 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2884 * noise vs. sse weight for the nsse comparison function
2885 * - encoding: Set by user.
2886 * - decoding: unused
2892 * - encoding: Set by user.
2893 * - decoding: Set by libavcodec.
2896 #define FF_PROFILE_UNKNOWN -99
2897 #define FF_PROFILE_RESERVED -100
2899 #define FF_PROFILE_AAC_MAIN 0
2900 #define FF_PROFILE_AAC_LOW 1
2901 #define FF_PROFILE_AAC_SSR 2
2902 #define FF_PROFILE_AAC_LTP 3
2903 #define FF_PROFILE_AAC_HE 4
2904 #define FF_PROFILE_AAC_HE_V2 28
2905 #define FF_PROFILE_AAC_LD 22
2906 #define FF_PROFILE_AAC_ELD 38
2907 #define FF_PROFILE_MPEG2_AAC_LOW 128
2908 #define FF_PROFILE_MPEG2_AAC_HE 131
2910 #define FF_PROFILE_DTS 20
2911 #define FF_PROFILE_DTS_ES 30
2912 #define FF_PROFILE_DTS_96_24 40
2913 #define FF_PROFILE_DTS_HD_HRA 50
2914 #define FF_PROFILE_DTS_HD_MA 60
2915 #define FF_PROFILE_DTS_EXPRESS 70
2917 #define FF_PROFILE_MPEG2_422 0
2918 #define FF_PROFILE_MPEG2_HIGH 1
2919 #define FF_PROFILE_MPEG2_SS 2
2920 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2921 #define FF_PROFILE_MPEG2_MAIN 4
2922 #define FF_PROFILE_MPEG2_SIMPLE 5
2924 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2925 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2927 #define FF_PROFILE_H264_BASELINE 66
2928 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2929 #define FF_PROFILE_H264_MAIN 77
2930 #define FF_PROFILE_H264_EXTENDED 88
2931 #define FF_PROFILE_H264_HIGH 100
2932 #define FF_PROFILE_H264_HIGH_10 110
2933 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2934 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
2935 #define FF_PROFILE_H264_HIGH_422 122
2936 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2937 #define FF_PROFILE_H264_STEREO_HIGH 128
2938 #define FF_PROFILE_H264_HIGH_444 144
2939 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2940 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2941 #define FF_PROFILE_H264_CAVLC_444 44
2943 #define FF_PROFILE_VC1_SIMPLE 0
2944 #define FF_PROFILE_VC1_MAIN 1
2945 #define FF_PROFILE_VC1_COMPLEX 2
2946 #define FF_PROFILE_VC1_ADVANCED 3
2948 #define FF_PROFILE_MPEG4_SIMPLE 0
2949 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2950 #define FF_PROFILE_MPEG4_CORE 2
2951 #define FF_PROFILE_MPEG4_MAIN 3
2952 #define FF_PROFILE_MPEG4_N_BIT 4
2953 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2954 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2955 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2956 #define FF_PROFILE_MPEG4_HYBRID 8
2957 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2958 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2959 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2960 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2961 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2962 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2963 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2965 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
2966 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
2967 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
2968 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2969 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2971 #define FF_PROFILE_VP9_0 0
2972 #define FF_PROFILE_VP9_1 1
2973 #define FF_PROFILE_VP9_2 2
2974 #define FF_PROFILE_VP9_3 3
2976 #define FF_PROFILE_HEVC_MAIN 1
2977 #define FF_PROFILE_HEVC_MAIN_10 2
2978 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2979 #define FF_PROFILE_HEVC_REXT 4
2983 * - encoding: Set by user.
2984 * - decoding: Set by libavcodec.
2987 #define FF_LEVEL_UNKNOWN -99
2990 * - encoding: unused
2991 * - decoding: Set by user.
2993 enum AVDiscard skip_loop_filter;
2996 * - encoding: unused
2997 * - decoding: Set by user.
2999 enum AVDiscard skip_idct;
3002 * - encoding: unused
3003 * - decoding: Set by user.
3005 enum AVDiscard skip_frame;
3008 * Header containing style information for text subtitles.
3009 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3010 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3011 * the Format line following. It shouldn't include any Dialogue line.
3012 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3013 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3015 uint8_t *subtitle_header;
3016 int subtitle_header_size;
3018 #if FF_API_ERROR_RATE
3020 * @deprecated use the 'error_rate' private AVOption of the mpegvideo
3023 attribute_deprecated
3027 #if FF_API_VBV_DELAY
3029 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3030 * Used for compliant TS muxing.
3031 * - encoding: Set by libavcodec.
3032 * - decoding: unused.
3033 * @deprecated this value is now exported as a part of
3034 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3036 attribute_deprecated
3040 #if FF_API_SIDEDATA_ONLY_PKT
3042 * Encoding only and set by default. Allow encoders to output packets
3043 * that do not contain any encoded data, only side data.
3045 * Some encoders need to output such packets, e.g. to update some stream
3046 * parameters at the end of encoding.
3048 * @deprecated this field disables the default behaviour and
3049 * it is kept only for compatibility.
3051 attribute_deprecated
3052 int side_data_only_packets;
3056 * Audio only. The number of "priming" samples (padding) inserted by the
3057 * encoder at the beginning of the audio. I.e. this number of leading
3058 * decoded samples must be discarded by the caller to get the original audio
3059 * without leading padding.
3061 * - decoding: unused
3062 * - encoding: Set by libavcodec. The timestamps on the output packets are
3063 * adjusted by the encoder so that they always refer to the
3064 * first sample of the data actually contained in the packet,
3065 * including any added padding. E.g. if the timebase is
3066 * 1/samplerate and the timestamp of the first input sample is
3067 * 0, the timestamp of the first output packet will be
3070 int initial_padding;
3073 * - decoding: For codecs that store a framerate value in the compressed
3074 * bitstream, the decoder may export it here. { 0, 1} when
3076 * - encoding: May be used to signal the framerate of CFR content to an
3079 AVRational framerate;
3082 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3083 * - encoding: unused.
3084 * - decoding: Set by libavcodec before calling get_format()
3086 enum AVPixelFormat sw_pix_fmt;
3089 * Additional data associated with the entire coded stream.
3091 * - decoding: unused
3092 * - encoding: may be set by libavcodec after avcodec_open2().
3094 AVPacketSideData *coded_side_data;
3095 int nb_coded_side_data;
3098 * A reference to the AVHWFramesContext describing the input (for encoding)
3099 * or output (decoding) frames. The reference is set by the caller and
3100 * afterwards owned (and freed) by libavcodec - it should never be read by
3101 * the caller after being set.
3103 * - decoding: This field should be set by the caller from the get_format()
3104 * callback. The previous reference (if any) will always be
3105 * unreffed by libavcodec before the get_format() call.
3107 * If the default get_buffer2() is used with a hwaccel pixel
3108 * format, then this AVHWFramesContext will be used for
3109 * allocating the frame buffers.
3111 * - encoding: For hardware encoders configured to use a hwaccel pixel
3112 * format, this field should be set by the caller to a reference
3113 * to the AVHWFramesContext describing input frames.
3114 * AVHWFramesContext.format must be equal to
3115 * AVCodecContext.pix_fmt.
3117 * This field should be set before avcodec_open2() is called.
3119 AVBufferRef *hw_frames_ctx;
3122 * Video decoding only. Certain video codecs support cropping, meaning that
3123 * only a sub-rectangle of the decoded frame is intended for display. This
3124 * option controls how cropping is handled by libavcodec.
3126 * When set to 1 (the default), libavcodec will apply cropping internally.
3127 * I.e. it will modify the output frame width/height fields and offset the
3128 * data pointers (only by as much as possible while preserving alignment, or
3129 * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3130 * the frames output by the decoder refer only to the cropped area. The
3131 * crop_* fields of the output frames will be zero.
3133 * When set to 0, the width/height fields of the output frames will be set
3134 * to the coded dimensions and the crop_* fields will describe the cropping
3135 * rectangle. Applying the cropping is left to the caller.
3137 * @warning When hardware acceleration with opaque output frames is used,
3138 * libavcodec is unable to apply cropping from the top/left border.
3140 * @note when this option is set to zero, the width/height fields of the
3141 * AVCodecContext and output AVFrames have different meanings. The codec
3142 * context fields store display dimensions (with the coded dimensions in
3143 * coded_width/height), while the frame fields store the coded dimensions
3144 * (with the display dimensions being determined by the crop_* fields).
3149 * A reference to the AVHWDeviceContext describing the device which will
3150 * be used by a hardware encoder/decoder. The reference is set by the
3151 * caller and afterwards owned (and freed) by libavcodec.
3153 * This should be used if either the codec device does not require
3154 * hardware frames or any that are used are to be allocated internally by
3155 * libavcodec. If the user wishes to supply any of the frames used as
3156 * encoder input or decoder output then hw_frames_ctx should be used
3157 * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3158 * field will be ignored while decoding the associated stream segment, but
3159 * may again be used on a following one after another get_format() call.
3161 * For both encoders and decoders this field should be set before
3162 * avcodec_open2() is called and must not be written to thereafter.
3164 * Note that some decoders may require this field to be set initially in
3165 * order to support hw_frames_ctx at all - in that case, all frames
3166 * contexts used must be created on the same device.
3168 AVBufferRef *hw_device_ctx;
3171 * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3172 * decoding (if active).
3173 * - encoding: unused
3174 * - decoding: Set by user (either before avcodec_open2(), or in the
3175 * AVCodecContext.get_format callback)
3183 typedef struct AVProfile {
3185 const char *name; ///< short name for the profile
3188 typedef struct AVCodecDefault AVCodecDefault;
3195 typedef struct AVCodec {
3197 * Name of the codec implementation.
3198 * The name is globally unique among encoders and among decoders (but an
3199 * encoder and a decoder can share the same name).
3200 * This is the primary way to find a codec from the user perspective.
3204 * Descriptive name for the codec, meant to be more human readable than name.
3205 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3207 const char *long_name;
3208 enum AVMediaType type;
3211 * Codec capabilities.
3212 * see AV_CODEC_CAP_*
3215 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3216 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3217 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3218 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3219 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3220 const AVClass *priv_class; ///< AVClass for the private context
3221 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3223 /*****************************************************************
3224 * No fields below this line are part of the public API. They
3225 * may not be used outside of libavcodec and can be changed and
3227 * New public fields should be added right above.
3228 *****************************************************************
3231 struct AVCodec *next;
3233 * @name Frame-level threading support functions
3237 * If defined, called on thread contexts when they are created.
3238 * If the codec allocates writable tables in init(), re-allocate them here.
3239 * priv_data will be set to a copy of the original.
3241 int (*init_thread_copy)(AVCodecContext *);
3243 * Copy necessary context variables from a previous thread context to the current one.
3244 * If not defined, the next thread will start automatically; otherwise, the codec
3245 * must call ff_thread_finish_setup().
3247 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3249 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3253 * Private codec-specific defaults.
3255 const AVCodecDefault *defaults;
3258 * Initialize codec static data, called from avcodec_register().
3260 void (*init_static_data)(struct AVCodec *codec);
3262 int (*init)(AVCodecContext *);
3263 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3264 const struct AVSubtitle *sub);
3266 * Encode data to an AVPacket.
3268 * @param avctx codec context
3269 * @param avpkt output AVPacket (may contain a user-provided buffer)
3270 * @param[in] frame AVFrame containing the raw data to be encoded
3271 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3272 * non-empty packet was returned in avpkt.
3273 * @return 0 on success, negative error code on failure
3275 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3276 int *got_packet_ptr);
3277 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3278 int (*close)(AVCodecContext *);
3280 * Encode API with decoupled packet/frame dataflow. The API is the
3281 * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3283 * - never called if the codec is closed or the wrong type,
3284 * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3285 * - only one drain frame is ever passed down,
3287 int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
3288 int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
3291 * Decode API with decoupled packet/frame dataflow. This function is called
3292 * to get one output frame. It should call ff_decode_get_packet() to obtain
3295 int (*receive_frame)(AVCodecContext *avctx, AVFrame *frame);
3298 * Will be called when seeking
3300 void (*flush)(AVCodecContext *);
3302 * Internal codec capabilities.
3303 * See FF_CODEC_CAP_* in internal.h
3308 * Decoding only, a comma-separated list of bitstream filters to apply to
3309 * packets before decoding.
3315 * @defgroup lavc_hwaccel AVHWAccel
3318 typedef struct AVHWAccel {
3320 * Name of the hardware accelerated codec.
3321 * The name is globally unique among encoders and among decoders (but an
3322 * encoder and a decoder can share the same name).
3327 * Type of codec implemented by the hardware accelerator.
3329 * See AVMEDIA_TYPE_xxx
3331 enum AVMediaType type;
3334 * Codec implemented by the hardware accelerator.
3336 * See AV_CODEC_ID_xxx
3341 * Supported pixel format.
3343 * Only hardware accelerated formats are supported here.
3345 enum AVPixelFormat pix_fmt;
3348 * Hardware accelerated codec capabilities.
3349 * see FF_HWACCEL_CODEC_CAP_*
3353 /*****************************************************************
3354 * No fields below this line are part of the public API. They
3355 * may not be used outside of libavcodec and can be changed and
3357 * New public fields should be added right above.
3358 *****************************************************************
3360 struct AVHWAccel *next;
3363 * Allocate a custom buffer
3365 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3368 * Called at the beginning of each frame or field picture.
3370 * Meaningful frame information (codec specific) is guaranteed to
3371 * be parsed at this point. This function is mandatory.
3373 * Note that buf can be NULL along with buf_size set to 0.
3374 * Otherwise, this means the whole frame is available at this point.
3376 * @param avctx the codec context
3377 * @param buf the frame data buffer base
3378 * @param buf_size the size of the frame in bytes
3379 * @return zero if successful, a negative value otherwise
3381 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3384 * Callback for each slice.
3386 * Meaningful slice information (codec specific) is guaranteed to
3387 * be parsed at this point. This function is mandatory.
3389 * @param avctx the codec context
3390 * @param buf the slice data buffer base
3391 * @param buf_size the size of the slice in bytes
3392 * @return zero if successful, a negative value otherwise
3394 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3397 * Called at the end of each frame or field picture.
3399 * The whole picture is parsed at this point and can now be sent
3400 * to the hardware accelerator. This function is mandatory.
3402 * @param avctx the codec context
3403 * @return zero if successful, a negative value otherwise
3405 int (*end_frame)(AVCodecContext *avctx);
3408 * Size of per-frame hardware accelerator private data.
3410 * Private data is allocated with av_mallocz() before
3411 * AVCodecContext.get_buffer() and deallocated after
3412 * AVCodecContext.release_buffer().
3414 int frame_priv_data_size;
3417 * Initialize the hwaccel private data.
3419 * This will be called from ff_get_format(), after hwaccel and
3420 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3423 int (*init)(AVCodecContext *avctx);
3426 * Uninitialize the hwaccel private data.
3428 * This will be called from get_format() or avcodec_close(), after hwaccel
3429 * and hwaccel_context are already uninitialized.
3431 int (*uninit)(AVCodecContext *avctx);
3434 * Size of the private data to allocate in
3435 * AVCodecInternal.hwaccel_priv_data.
3440 * Internal hwaccel capabilities.
3446 * Hardware acceleration should be used for decoding even if the codec level
3447 * used is unknown or higher than the maximum supported level reported by the
3450 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3453 * Hardware acceleration can output YUV pixel formats with a different chroma
3454 * sampling than 4:2:0 and/or other than 8 bits per component.
3456 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3462 #if FF_API_AVPICTURE
3464 * @defgroup lavc_picture AVPicture
3466 * Functions for working with AVPicture
3471 * four components are given, that's all.
3472 * the last component is alpha
3473 * @deprecated Use the imgutils functions
3475 typedef struct AVPicture {
3476 attribute_deprecated
3477 uint8_t *data[AV_NUM_DATA_POINTERS];
3478 attribute_deprecated
3479 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3487 #define AVPALETTE_SIZE 1024
3488 #define AVPALETTE_COUNT 256
3490 enum AVSubtitleType {
3493 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3496 * Plain text, the text field must be set by the decoder and is
3497 * authoritative. ass and pict fields may contain approximations.
3502 * Formatted text, the ass field must be set by the decoder and is
3503 * authoritative. pict and text fields may contain approximations.
3508 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3510 typedef struct AVSubtitleRect {
3511 int x; ///< top left corner of pict, undefined when pict is not set
3512 int y; ///< top left corner of pict, undefined when pict is not set
3513 int w; ///< width of pict, undefined when pict is not set
3514 int h; ///< height of pict, undefined when pict is not set
3515 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3517 #if FF_API_AVPICTURE
3519 * @deprecated unused
3521 attribute_deprecated
3525 * data+linesize for the bitmap of this subtitle.
3526 * Can be set for text/ass as well once they are rendered.
3531 enum AVSubtitleType type;
3533 char *text; ///< 0 terminated plain UTF-8 text
3536 * 0 terminated ASS/SSA compatible event line.
3537 * The presentation of this is unaffected by the other values in this
3544 typedef struct AVSubtitle {
3545 uint16_t format; /* 0 = graphics */
3546 uint32_t start_display_time; /* relative to packet pts, in ms */
3547 uint32_t end_display_time; /* relative to packet pts, in ms */
3549 AVSubtitleRect **rects;
3550 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3554 * This struct describes the properties of an encoded stream.
3556 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
3557 * be allocated with avcodec_parameters_alloc() and freed with
3558 * avcodec_parameters_free().
3560 typedef struct AVCodecParameters {
3562 * General type of the encoded data.
3564 enum AVMediaType codec_type;
3566 * Specific type of the encoded data (the codec used).
3568 enum AVCodecID codec_id;
3570 * Additional information about the codec (corresponds to the AVI FOURCC).
3575 * Extra binary data needed for initializing the decoder, codec-dependent.
3577 * Must be allocated with av_malloc() and will be freed by
3578 * avcodec_parameters_free(). The allocated size of extradata must be at
3579 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
3584 * Size of the extradata content in bytes.
3589 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
3590 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
3595 * The average bitrate of the encoded data (in bits per second).
3599 int bits_per_coded_sample;
3602 * Codec-specific bitstream restrictions that the stream conforms to.
3608 * Video only. The dimensions of the video frame in pixels.
3614 * Video only. The aspect ratio (width / height) which a single pixel
3615 * should have when displayed.
3617 * When the aspect ratio is unknown / undefined, the numerator should be
3618 * set to 0 (the denominator may have any value).
3620 AVRational sample_aspect_ratio;
3623 * Video only. The order of the fields in interlaced video.
3625 enum AVFieldOrder field_order;
3628 * Video only. Additional colorspace characteristics.
3630 enum AVColorRange color_range;
3631 enum AVColorPrimaries color_primaries;
3632 enum AVColorTransferCharacteristic color_trc;
3633 enum AVColorSpace color_space;
3634 enum AVChromaLocation chroma_location;
3637 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
3638 * unknown or unspecified, otherwise the number of bits set must be equal to
3639 * the channels field.
3641 uint64_t channel_layout;
3643 * Audio only. The number of audio channels.
3647 * Audio only. The number of audio samples per second.
3651 * Audio only. The number of bytes per coded audio frame, required by some
3654 * Corresponds to nBlockAlign in WAVEFORMATEX.
3659 * Audio only. The amount of padding (in samples) inserted by the encoder at
3660 * the beginning of the audio. I.e. this number of leading decoded samples
3661 * must be discarded by the caller to get the original audio without leading
3664 int initial_padding;
3666 * Audio only. The amount of padding (in samples) appended by the encoder to
3667 * the end of the audio. I.e. this number of decoded samples must be
3668 * discarded by the caller from the end of the stream to get the original
3669 * audio without any trailing padding.
3671 int trailing_padding;
3672 } AVCodecParameters;
3675 * If c is NULL, returns the first registered codec,
3676 * if c is non-NULL, returns the next registered codec after c,
3677 * or NULL if c is the last one.
3679 AVCodec *av_codec_next(const AVCodec *c);
3682 * Return the LIBAVCODEC_VERSION_INT constant.
3684 unsigned avcodec_version(void);
3687 * Return the libavcodec build-time configuration.
3689 const char *avcodec_configuration(void);
3692 * Return the libavcodec license.
3694 const char *avcodec_license(void);
3697 * Register the codec codec and initialize libavcodec.
3699 * @warning either this function or avcodec_register_all() must be called
3700 * before any other libavcodec functions.
3702 * @see avcodec_register_all()
3704 void avcodec_register(AVCodec *codec);
3707 * Register all the codecs, parsers and bitstream filters which were enabled at
3708 * configuration time. If you do not call this function you can select exactly
3709 * which formats you want to support, by using the individual registration
3712 * @see avcodec_register
3713 * @see av_register_codec_parser
3714 * @see av_register_bitstream_filter
3716 void avcodec_register_all(void);
3719 * Allocate an AVCodecContext and set its fields to default values. The
3720 * resulting struct should be freed with avcodec_free_context().
3722 * @param codec if non-NULL, allocate private data and initialize defaults
3723 * for the given codec. It is illegal to then call avcodec_open2()
3724 * with a different codec.
3725 * If NULL, then the codec-specific defaults won't be initialized,
3726 * which may result in suboptimal default settings (this is
3727 * important mainly for encoders, e.g. libx264).
3729 * @return An AVCodecContext filled with default values or NULL on failure.
3731 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3734 * Free the codec context and everything associated with it and write NULL to
3735 * the provided pointer.
3737 void avcodec_free_context(AVCodecContext **avctx);
3739 #if FF_API_GET_CONTEXT_DEFAULTS
3741 * @deprecated This function should not be used, as closing and opening a codec
3742 * context multiple time is not supported. A new codec context should be
3743 * allocated for each new use.
3745 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3749 * Get the AVClass for AVCodecContext. It can be used in combination with
3750 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3752 * @see av_opt_find().
3754 const AVClass *avcodec_get_class(void);
3756 #if FF_API_COPY_CONTEXT
3758 * Copy the settings of the source AVCodecContext into the destination
3759 * AVCodecContext. The resulting destination codec context will be
3760 * unopened, i.e. you are required to call avcodec_open2() before you
3761 * can use this AVCodecContext to decode/encode video/audio data.
3763 * @param dest target codec context, should be initialized with
3764 * avcodec_alloc_context3(), but otherwise uninitialized
3765 * @param src source codec context
3766 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3768 * @deprecated The semantics of this function are ill-defined and it should not
3769 * be used. If you need to transfer the stream parameters from one codec context
3770 * to another, use an intermediate AVCodecParameters instance and the
3771 * avcodec_parameters_from_context() / avcodec_parameters_to_context()
3774 attribute_deprecated
3775 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3779 * Allocate a new AVCodecParameters and set its fields to default values
3780 * (unknown/invalid/0). The returned struct must be freed with
3781 * avcodec_parameters_free().
3783 AVCodecParameters *avcodec_parameters_alloc(void);
3786 * Free an AVCodecParameters instance and everything associated with it and
3787 * write NULL to the supplied pointer.
3789 void avcodec_parameters_free(AVCodecParameters **par);
3792 * Copy the contents of src to dst. Any allocated fields in dst are freed and
3793 * replaced with newly allocated duplicates of the corresponding fields in src.
3795 * @return >= 0 on success, a negative AVERROR code on failure.
3797 int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
3800 * Fill the parameters struct based on the values from the supplied codec
3801 * context. Any allocated fields in par are freed and replaced with duplicates
3802 * of the corresponding fields in codec.
3804 * @return >= 0 on success, a negative AVERROR code on failure
3806 int avcodec_parameters_from_context(AVCodecParameters *par,
3807 const AVCodecContext *codec);
3810 * Fill the codec context based on the values from the supplied codec
3811 * parameters. Any allocated fields in codec that have a corresponding field in
3812 * par are freed and replaced with duplicates of the corresponding field in par.
3813 * Fields in codec that do not have a counterpart in par are not touched.
3815 * @return >= 0 on success, a negative AVERROR code on failure.
3817 int avcodec_parameters_to_context(AVCodecContext *codec,
3818 const AVCodecParameters *par);
3821 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3822 * function the context has to be allocated with avcodec_alloc_context3().
3824 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3825 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3826 * retrieving a codec.
3828 * @warning This function is not thread safe!
3830 * @note Always call this function before using decoding routines (such as
3831 * @ref avcodec_receive_frame()).
3834 * avcodec_register_all();
3835 * av_dict_set(&opts, "b", "2.5M", 0);
3836 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3840 * context = avcodec_alloc_context3(codec);
3842 * if (avcodec_open2(context, codec, opts) < 0)
3846 * @param avctx The context to initialize.
3847 * @param codec The codec to open this context for. If a non-NULL codec has been
3848 * previously passed to avcodec_alloc_context3() or
3849 * for this context, then this parameter MUST be either NULL or
3850 * equal to the previously passed codec.
3851 * @param options A dictionary filled with AVCodecContext and codec-private options.
3852 * On return this object will be filled with options that were not found.
3854 * @return zero on success, a negative value on error
3855 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3856 * av_dict_set(), av_opt_find().
3858 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3861 * Close a given AVCodecContext and free all the data associated with it
3862 * (but not the AVCodecContext itself).
3864 * Calling this function on an AVCodecContext that hasn't been opened will free
3865 * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
3866 * codec. Subsequent calls will do nothing.
3868 * @note Do not use this function. Use avcodec_free_context() to destroy a
3869 * codec context (either open or closed). Opening and closing a codec context
3870 * multiple times is not supported anymore -- use multiple codec contexts
3873 int avcodec_close(AVCodecContext *avctx);
3876 * Free all allocated data in the given subtitle struct.
3878 * @param sub AVSubtitle to free.
3880 void avsubtitle_free(AVSubtitle *sub);
3887 * @addtogroup lavc_packet
3892 * Allocate an AVPacket and set its fields to default values. The resulting
3893 * struct must be freed using av_packet_free().
3895 * @return An AVPacket filled with default values or NULL on failure.
3897 * @note this only allocates the AVPacket itself, not the data buffers. Those
3898 * must be allocated through other means such as av_new_packet.
3900 * @see av_new_packet
3902 AVPacket *av_packet_alloc(void);
3905 * Create a new packet that references the same data as src.
3907 * This is a shortcut for av_packet_alloc()+av_packet_ref().
3909 * @return newly created AVPacket on success, NULL on error.
3911 * @see av_packet_alloc
3912 * @see av_packet_ref
3914 AVPacket *av_packet_clone(const AVPacket *src);
3917 * Free the packet, if the packet is reference counted, it will be
3918 * unreferenced first.
3920 * @param pkt packet to be freed. The pointer will be set to NULL.
3921 * @note passing NULL is a no-op.
3923 void av_packet_free(AVPacket **pkt);
3926 * Initialize optional fields of a packet with default values.
3928 * Note, this does not touch the data and size members, which have to be
3929 * initialized separately.
3933 void av_init_packet(AVPacket *pkt);
3936 * Allocate the payload of a packet and initialize its fields with
3940 * @param size wanted payload size
3941 * @return 0 if OK, AVERROR_xxx otherwise
3943 int av_new_packet(AVPacket *pkt, int size);
3946 * Reduce packet size, correctly zeroing padding
3949 * @param size new size
3951 void av_shrink_packet(AVPacket *pkt, int size);
3954 * Increase packet size, correctly zeroing padding
3957 * @param grow_by number of bytes by which to increase the size of the packet
3959 int av_grow_packet(AVPacket *pkt, int grow_by);
3962 * Initialize a reference-counted packet from av_malloc()ed data.
3964 * @param pkt packet to be initialized. This function will set the data, size,
3965 * buf and destruct fields, all others are left untouched.
3966 * @param data Data allocated by av_malloc() to be used as packet data. If this
3967 * function returns successfully, the data is owned by the underlying AVBuffer.
3968 * The caller may not access the data through other means.
3969 * @param size size of data in bytes, without the padding. I.e. the full buffer
3970 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
3972 * @return 0 on success, a negative AVERROR on error
3974 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3976 #if FF_API_AVPACKET_OLD_API
3978 * @warning This is a hack - the packet memory allocation stuff is broken. The
3979 * packet is allocated if it was not really allocated.
3981 * @deprecated Use av_packet_ref
3983 attribute_deprecated
3984 int av_dup_packet(AVPacket *pkt);
3988 * @deprecated Use av_packet_unref
3990 * @param pkt packet to free
3992 attribute_deprecated
3993 void av_free_packet(AVPacket *pkt);
3996 * Allocate new information of a packet.
3999 * @param type side information type
4000 * @param size side information size
4001 * @return pointer to fresh allocated data or NULL otherwise
4003 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4007 * Wrap an existing array as a packet side data.
4010 * @param type side information type
4011 * @param data the side data array. It must be allocated with the av_malloc()
4012 * family of functions. The ownership of the data is transferred to
4014 * @param size side information size
4015 * @return a non-negative number on success, a negative AVERROR code on
4016 * failure. On failure, the packet is unchanged and the data remains
4017 * owned by the caller.
4019 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4020 uint8_t *data, size_t size);
4023 * Shrink the already allocated side data buffer
4026 * @param type side information type
4027 * @param size new side information size
4028 * @return 0 on success, < 0 on failure
4030 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4034 * Get side information from packet.
4037 * @param type desired side information type
4038 * @param size pointer for side information size to store (optional)
4039 * @return pointer to data if present or NULL otherwise
4041 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4045 * Convenience function to free all the side data stored.
4046 * All the other fields stay untouched.
4050 void av_packet_free_side_data(AVPacket *pkt);
4053 * Setup a new reference to the data described by a given packet
4055 * If src is reference-counted, setup dst as a new reference to the
4056 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4057 * data from src into it.
4059 * All the other fields are copied from src.
4061 * @see av_packet_unref
4063 * @param dst Destination packet
4064 * @param src Source packet
4066 * @return 0 on success, a negative AVERROR on error.
4068 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4073 * Unreference the buffer referenced by the packet and reset the
4074 * remaining packet fields to their default values.
4076 * @param pkt The packet to be unreferenced.
4078 void av_packet_unref(AVPacket *pkt);
4081 * Move every field in src to dst and reset src.
4083 * @see av_packet_unref
4085 * @param src Source packet, will be reset
4086 * @param dst Destination packet
4088 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4091 * Copy only "properties" fields from src to dst.
4093 * Properties for the purpose of this function are all the fields
4094 * beside those related to the packet data (buf, data, size)
4096 * @param dst Destination packet
4097 * @param src Source packet
4099 * @return 0 on success AVERROR on failure.
4101 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4104 * Convert valid timing fields (timestamps / durations) in a packet from one
4105 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4108 * @param pkt packet on which the conversion will be performed
4109 * @param tb_src source timebase, in which the timing fields in pkt are
4111 * @param tb_dst destination timebase, to which the timing fields will be
4114 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4121 * @addtogroup lavc_decoding
4126 * Find a registered decoder with a matching codec ID.
4128 * @param id AVCodecID of the requested decoder
4129 * @return A decoder if one was found, NULL otherwise.
4131 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4134 * Find a registered decoder with the specified name.
4136 * @param name name of the requested decoder
4137 * @return A decoder if one was found, NULL otherwise.
4139 AVCodec *avcodec_find_decoder_by_name(const char *name);
4142 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4143 * it can be called by custom get_buffer2() implementations for decoders without
4144 * AV_CODEC_CAP_DR1 set.
4146 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4150 * Return the amount of padding in pixels which the get_buffer callback must
4151 * provide around the edge of the image for codecs which do not have the
4152 * CODEC_FLAG_EMU_EDGE flag.
4154 * @return Required padding in pixels.
4156 * @deprecated CODEC_FLAG_EMU_EDGE is deprecated, so this function is no longer
4159 attribute_deprecated
4160 unsigned avcodec_get_edge_width(void);
4164 * Modify width and height values so that they will result in a memory
4165 * buffer that is acceptable for the codec if you do not use any horizontal
4168 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4170 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4173 * Modify width and height values so that they will result in a memory
4174 * buffer that is acceptable for the codec if you also ensure that all
4175 * line sizes are a multiple of the respective linesize_align[i].
4177 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4179 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4180 int linesize_align[AV_NUM_DATA_POINTERS]);
4183 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4185 * Some decoders may support multiple frames in a single AVPacket. Such
4186 * decoders would then just decode the first frame and the return value would be
4187 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4188 * called again with an AVPacket containing the remaining data in order to
4189 * decode the second frame, etc... Even if no frames are returned, the packet
4190 * needs to be fed to the decoder with remaining data until it is completely
4191 * consumed or an error occurs.
4193 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4194 * and output. This means that for some packets they will not immediately
4195 * produce decoded output and need to be flushed at the end of decoding to get
4196 * all the decoded data. Flushing is done by calling this function with packets
4197 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4198 * returning samples. It is safe to flush even those decoders that are not
4199 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4201 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4202 * larger than the actual read bytes because some optimized bitstream
4203 * readers read 32 or 64 bits at once and could read over the end.
4205 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4206 * before packets may be fed to the decoder.
4208 * @param avctx the codec context
4209 * @param[out] frame The AVFrame in which to store decoded audio samples.
4210 * The decoder will allocate a buffer for the decoded frame by
4211 * calling the AVCodecContext.get_buffer2() callback.
4212 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4213 * reference counted and the returned reference belongs to the
4214 * caller. The caller must release the frame using av_frame_unref()
4215 * when the frame is no longer needed. The caller may safely write
4216 * to the frame if av_frame_is_writable() returns 1.
4217 * When AVCodecContext.refcounted_frames is set to 0, the returned
4218 * reference belongs to the decoder and is valid only until the
4219 * next call to this function or until closing or flushing the
4220 * decoder. The caller may not write to it.
4221 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4222 * non-zero. Note that this field being set to zero
4223 * does not mean that an error has occurred. For
4224 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4225 * call is guaranteed to produce a frame.
4226 * @param[in] avpkt The input AVPacket containing the input buffer.
4227 * At least avpkt->data and avpkt->size should be set. Some
4228 * decoders might also require additional fields to be set.
4229 * @return A negative error code is returned if an error occurred during
4230 * decoding, otherwise the number of bytes consumed from the input
4231 * AVPacket is returned.
4233 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4235 attribute_deprecated
4236 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4237 int *got_frame_ptr, AVPacket *avpkt);
4240 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4241 * Some decoders may support multiple frames in a single AVPacket, such
4242 * decoders would then just decode the first frame.
4244 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4245 * the actual read bytes because some optimized bitstream readers read 32 or 64
4246 * bits at once and could read over the end.
4248 * @warning The end of the input buffer buf should be set to 0 to ensure that
4249 * no overreading happens for damaged MPEG streams.
4251 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4252 * between input and output, these need to be fed with avpkt->data=NULL,
4253 * avpkt->size=0 at the end to return the remaining frames.
4255 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4256 * before packets may be fed to the decoder.
4258 * @param avctx the codec context
4259 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4260 * Use av_frame_alloc() to get an AVFrame. The codec will
4261 * allocate memory for the actual bitmap by calling the
4262 * AVCodecContext.get_buffer2() callback.
4263 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4264 * reference counted and the returned reference belongs to the
4265 * caller. The caller must release the frame using av_frame_unref()
4266 * when the frame is no longer needed. The caller may safely write
4267 * to the frame if av_frame_is_writable() returns 1.
4268 * When AVCodecContext.refcounted_frames is set to 0, the returned
4269 * reference belongs to the decoder and is valid only until the
4270 * next call to this function or until closing or flushing the
4271 * decoder. The caller may not write to it.
4273 * @param[in] avpkt The input AVPacket containing the input buffer.
4274 * You can create such packet with av_init_packet() and by then setting
4275 * data and size, some decoders might in addition need other fields like
4276 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4278 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4279 * @return On error a negative value is returned, otherwise the number of bytes
4280 * used or zero if no frame could be decompressed.
4282 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4284 attribute_deprecated
4285 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4286 int *got_picture_ptr,
4290 * Decode a subtitle message.
4291 * Return a negative value on error, otherwise return the number of bytes used.
4292 * If no subtitle could be decompressed, got_sub_ptr is zero.
4293 * Otherwise, the subtitle is stored in *sub.
4294 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4295 * simplicity, because the performance difference is expect to be negligible
4296 * and reusing a get_buffer written for video codecs would probably perform badly
4297 * due to a potentially very different allocation pattern.
4299 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4300 * before packets may be fed to the decoder.
4302 * @param avctx the codec context
4303 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
4304 freed with avsubtitle_free if *got_sub_ptr is set.
4305 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4306 * @param[in] avpkt The input AVPacket containing the input buffer.
4308 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4313 * Supply raw packet data as input to a decoder.
4315 * Internally, this call will copy relevant AVCodecContext fields, which can
4316 * influence decoding per-packet, and apply them when the packet is actually
4317 * decoded. (For example AVCodecContext.skip_frame, which might direct the
4318 * decoder to drop the frame contained by the packet sent with this function.)
4320 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4321 * larger than the actual read bytes because some optimized bitstream
4322 * readers read 32 or 64 bits at once and could read over the end.
4324 * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
4325 * on the same AVCodecContext. It will return unexpected results now
4326 * or in future libavcodec versions.
4328 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4329 * before packets may be fed to the decoder.
4331 * @param avctx codec context
4332 * @param[in] avpkt The input AVPacket. Usually, this will be a single video
4333 * frame, or several complete audio frames.
4334 * Ownership of the packet remains with the caller, and the
4335 * decoder will not write to the packet. The decoder may create
4336 * a reference to the packet data (or copy it if the packet is
4337 * not reference-counted).
4338 * Unlike with older APIs, the packet is always fully consumed,
4339 * and if it contains multiple frames (e.g. some audio codecs),
4340 * will require you to call avcodec_receive_frame() multiple
4341 * times afterwards before you can send a new packet.
4342 * It can be NULL (or an AVPacket with data set to NULL and
4343 * size set to 0); in this case, it is considered a flush
4344 * packet, which signals the end of the stream. Sending the
4345 * first flush packet will return success. Subsequent ones are
4346 * unnecessary and will return AVERROR_EOF. If the decoder
4347 * still has frames buffered, it will return them after sending
4350 * @return 0 on success, otherwise negative error code:
4351 * AVERROR(EAGAIN): input is not accepted in the current state - user
4352 * must read output with avcodec_receive_frame() (once
4353 * all output is read, the packet should be resent, and
4354 * the call will not fail with EAGAIN).
4355 * AVERROR_EOF: the decoder has been flushed, and no new packets can
4356 * be sent to it (also returned if more than 1 flush
4358 * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
4359 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4360 * other errors: legitimate decoding errors
4362 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
4365 * Return decoded output data from a decoder.
4367 * @param avctx codec context
4368 * @param frame This will be set to a reference-counted video or audio
4369 * frame (depending on the decoder type) allocated by the
4370 * decoder. Note that the function will always call
4371 * av_frame_unref(frame) before doing anything else.
4374 * 0: success, a frame was returned
4375 * AVERROR(EAGAIN): output is not available in this state - user must try
4377 * AVERROR_EOF: the decoder has been fully flushed, and there will be
4378 * no more output frames
4379 * AVERROR(EINVAL): codec not opened, or it is an encoder
4380 * other negative values: legitimate decoding errors
4382 int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
4385 * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
4386 * to retrieve buffered output packets.
4388 * @param avctx codec context
4389 * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
4390 * Ownership of the frame remains with the caller, and the
4391 * encoder will not write to the frame. The encoder may create
4392 * a reference to the frame data (or copy it if the frame is
4393 * not reference-counted).
4394 * It can be NULL, in which case it is considered a flush
4395 * packet. This signals the end of the stream. If the encoder
4396 * still has packets buffered, it will return them after this
4397 * call. Once flushing mode has been entered, additional flush
4398 * packets are ignored, and sending frames will return
4402 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4403 * can have any number of samples.
4404 * If it is not set, frame->nb_samples must be equal to
4405 * avctx->frame_size for all frames except the last.
4406 * The final frame may be smaller than avctx->frame_size.
4407 * @return 0 on success, otherwise negative error code:
4408 * AVERROR(EAGAIN): input is not accepted in the current state - user
4409 * must read output with avcodec_receive_packet() (once
4410 * all output is read, the packet should be resent, and
4411 * the call will not fail with EAGAIN).
4412 * AVERROR_EOF: the encoder has been flushed, and no new frames can
4414 * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
4415 * decoder, or requires flush
4416 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4417 * other errors: legitimate decoding errors
4419 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
4422 * Read encoded data from the encoder.
4424 * @param avctx codec context
4425 * @param avpkt This will be set to a reference-counted packet allocated by the
4426 * encoder. Note that the function will always call
4427 * av_frame_unref(frame) before doing anything else.
4428 * @return 0 on success, otherwise negative error code:
4429 * AVERROR(EAGAIN): output is not available in the current state - user
4430 * must try to send input
4431 * AVERROR_EOF: the encoder has been fully flushed, and there will be
4432 * no more output packets
4433 * AVERROR(EINVAL): codec not opened, or it is an encoder
4434 * other errors: legitimate decoding errors
4436 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
4440 * @defgroup lavc_parsing Frame parsing
4444 enum AVPictureStructure {
4445 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
4446 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
4447 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
4448 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
4451 typedef struct AVCodecParserContext {
4453 struct AVCodecParser *parser;
4454 int64_t frame_offset; /* offset of the current frame */
4455 int64_t cur_offset; /* current offset
4456 (incremented by each av_parser_parse()) */
4457 int64_t next_frame_offset; /* offset of the next frame */
4459 int pict_type; /* XXX: Put it back in AVCodecContext. */
4461 * This field is used for proper frame duration computation in lavf.
4462 * It signals, how much longer the frame duration of the current frame
4463 * is compared to normal frame duration.
4465 * frame_duration = (1 + repeat_pict) * time_base
4467 * It is used by codecs like H.264 to display telecined material.
4469 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4470 int64_t pts; /* pts of the current frame */
4471 int64_t dts; /* dts of the current frame */
4476 int fetch_timestamp;
4478 #define AV_PARSER_PTS_NB 4
4479 int cur_frame_start_index;
4480 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4481 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4482 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4485 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4486 #define PARSER_FLAG_ONCE 0x0002
4487 /// Set if the parser has a valid file offset
4488 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4490 int64_t offset; ///< byte offset from starting packet start
4491 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4494 * Set by parser to 1 for key frames and 0 for non-key frames.
4495 * It is initialized to -1, so if the parser doesn't set this flag,
4496 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4501 #if FF_API_CONVERGENCE_DURATION
4503 * @deprecated unused
4505 attribute_deprecated
4506 int64_t convergence_duration;
4509 // Timestamp generation support:
4511 * Synchronization point for start of timestamp generation.
4513 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4516 * For example, this corresponds to presence of H.264 buffering period
4522 * Offset of the current timestamp against last timestamp sync point in
4523 * units of AVCodecContext.time_base.
4525 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4526 * contain a valid timestamp offset.
4528 * Note that the timestamp of sync point has usually a nonzero
4529 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4530 * the next frame after timestamp sync point will be usually 1.
4532 * For example, this corresponds to H.264 cpb_removal_delay.
4534 int dts_ref_dts_delta;
4537 * Presentation delay of current frame in units of AVCodecContext.time_base.
4539 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4540 * contain valid non-negative timestamp delta (presentation time of a frame
4541 * must not lie in the past).
4543 * This delay represents the difference between decoding and presentation
4544 * time of the frame.
4546 * For example, this corresponds to H.264 dpb_output_delay.
4551 * Position of the packet in file.
4553 * Analogous to cur_frame_pts/dts
4555 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4558 * Byte position of currently parsed frame in stream.
4563 * Previous frame byte position.
4568 * Duration of the current frame.
4569 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4570 * For all other types, this is in units of AVCodecContext.time_base.
4574 enum AVFieldOrder field_order;
4577 * Indicate whether a picture is coded as a frame, top field or bottom field.
4579 * For example, H.264 field_pic_flag equal to 0 corresponds to
4580 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4581 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4582 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4584 enum AVPictureStructure picture_structure;
4587 * Picture number incremented in presentation or output order.
4588 * This field may be reinitialized at the first picture of a new sequence.
4590 * For example, this corresponds to H.264 PicOrderCnt.
4592 int output_picture_number;
4595 * Dimensions of the decoded video intended for presentation.
4601 * Dimensions of the coded video.
4607 * The format of the coded data, corresponds to enum AVPixelFormat for video
4608 * and for enum AVSampleFormat for audio.
4610 * Note that a decoder can have considerable freedom in how exactly it
4611 * decodes the data, so the format reported here might be different from the
4612 * one returned by a decoder.
4615 } AVCodecParserContext;
4617 typedef struct AVCodecParser {
4618 int codec_ids[5]; /* several codec IDs are permitted */
4620 int (*parser_init)(AVCodecParserContext *s);
4621 /* This callback never returns an error, a negative value means that
4622 * the frame start was in a previous packet. */
4623 int (*parser_parse)(AVCodecParserContext *s,
4624 AVCodecContext *avctx,
4625 const uint8_t **poutbuf, int *poutbuf_size,
4626 const uint8_t *buf, int buf_size);
4627 void (*parser_close)(AVCodecParserContext *s);
4628 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4629 struct AVCodecParser *next;
4632 AVCodecParser *av_parser_next(const AVCodecParser *c);
4634 void av_register_codec_parser(AVCodecParser *parser);
4635 AVCodecParserContext *av_parser_init(int codec_id);
4640 * @param s parser context.
4641 * @param avctx codec context.
4642 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4643 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4644 * @param buf input buffer.
4645 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4646 * @param pts input presentation timestamp.
4647 * @param dts input decoding timestamp.
4648 * @param pos input byte position in stream.
4649 * @return the number of bytes of the input bitstream used.
4654 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4661 * decode_frame(data, size);
4665 int av_parser_parse2(AVCodecParserContext *s,
4666 AVCodecContext *avctx,
4667 uint8_t **poutbuf, int *poutbuf_size,
4668 const uint8_t *buf, int buf_size,
4669 int64_t pts, int64_t dts,
4673 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4674 * @deprecated use AVBitstreamFilter
4676 int av_parser_change(AVCodecParserContext *s,
4677 AVCodecContext *avctx,
4678 uint8_t **poutbuf, int *poutbuf_size,
4679 const uint8_t *buf, int buf_size, int keyframe);
4680 void av_parser_close(AVCodecParserContext *s);
4688 * @addtogroup lavc_encoding
4693 * Find a registered encoder with a matching codec ID.
4695 * @param id AVCodecID of the requested encoder
4696 * @return An encoder if one was found, NULL otherwise.
4698 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4701 * Find a registered encoder with the specified name.
4703 * @param name name of the requested encoder
4704 * @return An encoder if one was found, NULL otherwise.
4706 AVCodec *avcodec_find_encoder_by_name(const char *name);
4709 * Encode a frame of audio.
4711 * Takes input samples from frame and writes the next output packet, if
4712 * available, to avpkt. The output packet does not necessarily contain data for
4713 * the most recent frame, as encoders can delay, split, and combine input frames
4714 * internally as needed.
4716 * @param avctx codec context
4717 * @param avpkt output AVPacket.
4718 * The user can supply an output buffer by setting
4719 * avpkt->data and avpkt->size prior to calling the
4720 * function, but if the size of the user-provided data is not
4721 * large enough, encoding will fail. All other AVPacket fields
4722 * will be reset by the encoder using av_init_packet(). If
4723 * avpkt->data is NULL, the encoder will allocate it.
4724 * The encoder will set avpkt->size to the size of the
4727 * If this function fails or produces no output, avpkt will be
4728 * freed using av_packet_unref().
4729 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4730 * May be NULL when flushing an encoder that has the
4731 * AV_CODEC_CAP_DELAY capability set.
4732 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4733 * can have any number of samples.
4734 * If it is not set, frame->nb_samples must be equal to
4735 * avctx->frame_size for all frames except the last.
4736 * The final frame may be smaller than avctx->frame_size.
4737 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4738 * output packet is non-empty, and to 0 if it is
4739 * empty. If the function returns an error, the
4740 * packet can be assumed to be invalid, and the
4741 * value of got_packet_ptr is undefined and should
4743 * @return 0 on success, negative error code on failure
4745 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
4747 attribute_deprecated
4748 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4749 const AVFrame *frame, int *got_packet_ptr);
4752 * Encode a frame of video.
4754 * Takes input raw video data from frame and writes the next output packet, if
4755 * available, to avpkt. The output packet does not necessarily contain data for
4756 * the most recent frame, as encoders can delay and reorder input frames
4757 * internally as needed.
4759 * @param avctx codec context
4760 * @param avpkt output AVPacket.
4761 * The user can supply an output buffer by setting
4762 * avpkt->data and avpkt->size prior to calling the
4763 * function, but if the size of the user-provided data is not
4764 * large enough, encoding will fail. All other AVPacket fields
4765 * will be reset by the encoder using av_init_packet(). If
4766 * avpkt->data is NULL, the encoder will allocate it.
4767 * The encoder will set avpkt->size to the size of the
4768 * output packet. The returned data (if any) belongs to the
4769 * caller, he is responsible for freeing it.
4771 * If this function fails or produces no output, avpkt will be
4772 * freed using av_packet_unref().
4773 * @param[in] frame AVFrame containing the raw video data to be encoded.
4774 * May be NULL when flushing an encoder that has the
4775 * AV_CODEC_CAP_DELAY capability set.
4776 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4777 * output packet is non-empty, and to 0 if it is
4778 * empty. If the function returns an error, the
4779 * packet can be assumed to be invalid, and the
4780 * value of got_packet_ptr is undefined and should
4782 * @return 0 on success, negative error code on failure
4784 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
4786 attribute_deprecated
4787 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4788 const AVFrame *frame, int *got_packet_ptr);
4790 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4791 const AVSubtitle *sub);
4798 #if FF_API_AVPICTURE
4800 * @addtogroup lavc_picture
4805 * @deprecated unused
4807 attribute_deprecated
4808 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4811 * @deprecated unused
4813 attribute_deprecated
4814 void avpicture_free(AVPicture *picture);
4817 * @deprecated use av_image_fill_arrays() instead.
4819 attribute_deprecated
4820 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4821 enum AVPixelFormat pix_fmt, int width, int height);
4824 * @deprecated use av_image_copy_to_buffer() instead.
4826 attribute_deprecated
4827 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4828 int width, int height,
4829 unsigned char *dest, int dest_size);
4832 * @deprecated use av_image_get_buffer_size() instead.
4834 attribute_deprecated
4835 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4838 * @deprecated av_image_copy() instead.
4840 attribute_deprecated
4841 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4842 enum AVPixelFormat pix_fmt, int width, int height);
4845 * @deprecated unused
4847 attribute_deprecated
4848 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4849 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4852 * @deprecated unused
4854 attribute_deprecated
4855 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4856 int padtop, int padbottom, int padleft, int padright, int *color);
4864 * @defgroup lavc_misc Utility functions
4867 * Miscellaneous utility functions related to both encoding and decoding
4873 * @defgroup lavc_misc_pixfmt Pixel formats
4875 * Functions for working with pixel formats.
4880 * Return a value representing the fourCC code associated to the
4881 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4884 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4886 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4887 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4888 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4889 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4890 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4891 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4894 * Compute what kind of losses will occur when converting from one specific
4895 * pixel format to another.
4896 * When converting from one pixel format to another, information loss may occur.
4897 * For example, when converting from RGB24 to GRAY, the color information will
4898 * be lost. Similarly, other losses occur when converting from some formats to
4899 * other formats. These losses can involve loss of chroma, but also loss of
4900 * resolution, loss of color depth, loss due to the color space conversion, loss
4901 * of the alpha bits or loss due to color quantization.
4902 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4903 * which will occur when converting from one pixel format to another.
4905 * @param[in] dst_pix_fmt destination pixel format
4906 * @param[in] src_pix_fmt source pixel format
4907 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4908 * @return Combination of flags informing you what kind of losses will occur.
4910 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4914 * Find the best pixel format to convert to given a certain source pixel
4915 * format. When converting from one pixel format to another, information loss
4916 * may occur. For example, when converting from RGB24 to GRAY, the color
4917 * information will be lost. Similarly, other losses occur when converting from
4918 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4919 * the given pixel formats should be used to suffer the least amount of loss.
4920 * The pixel formats from which it chooses one, are determined by the
4921 * pix_fmt_list parameter.
4924 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4925 * @param[in] src_pix_fmt source pixel format
4926 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4927 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4928 * @return The best pixel format to convert to or -1 if none was found.
4930 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4931 enum AVPixelFormat src_pix_fmt,
4932 int has_alpha, int *loss_ptr);
4934 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4941 * Put a string representing the codec tag codec_tag in buf.
4943 * @param buf buffer to place codec tag in
4944 * @param buf_size size in bytes of buf
4945 * @param codec_tag codec tag to assign
4946 * @return the length of the string that would have been generated if
4947 * enough space had been available, excluding the trailing null
4949 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4951 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4954 * Return a name for the specified profile, if available.
4956 * @param codec the codec that is searched for the given profile
4957 * @param profile the profile value for which a name is requested
4958 * @return A name for the profile if found, NULL otherwise.
4960 const char *av_get_profile_name(const AVCodec *codec, int profile);
4963 * Return a name for the specified profile, if available.
4965 * @param codec_id the ID of the codec to which the requested profile belongs
4966 * @param profile the profile value for which a name is requested
4967 * @return A name for the profile if found, NULL otherwise.
4969 * @note unlike av_get_profile_name(), which searches a list of profiles
4970 * supported by a specific decoder or encoder implementation, this
4971 * function searches the list of profiles from the AVCodecDescriptor
4973 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
4975 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4976 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4977 //FIXME func typedef
4980 * Fill audio frame data and linesize.
4981 * AVFrame extended_data channel pointers are allocated if necessary for
4984 * @param frame the AVFrame
4985 * frame->nb_samples must be set prior to calling the
4986 * function. This function fills in frame->data,
4987 * frame->extended_data, frame->linesize[0].
4988 * @param nb_channels channel count
4989 * @param sample_fmt sample format
4990 * @param buf buffer to use for frame data
4991 * @param buf_size size of buffer
4992 * @param align plane size sample alignment (0 = default)
4993 * @return 0 on success, negative error code on failure
4995 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4996 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4997 int buf_size, int align);
5000 * Reset the internal decoder state / flush internal buffers. Should be called
5001 * e.g. when seeking or when switching to a different stream.
5003 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5004 * this invalidates the frames previously returned from the decoder. When
5005 * refcounted frames are used, the decoder just releases any references it might
5006 * keep internally, but the caller's reference remains valid.
5008 void avcodec_flush_buffers(AVCodecContext *avctx);
5011 * Return codec bits per sample.
5013 * @param[in] codec_id the codec
5014 * @return Number of bits per sample or zero if unknown for the given codec.
5016 int av_get_bits_per_sample(enum AVCodecID codec_id);
5019 * Return codec bits per sample.
5020 * Only return non-zero if the bits per sample is exactly correct, not an
5023 * @param[in] codec_id the codec
5024 * @return Number of bits per sample or zero if unknown for the given codec.
5026 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5029 * Return audio frame duration.
5031 * @param avctx codec context
5032 * @param frame_bytes size of the frame, or 0 if unknown
5033 * @return frame duration, in samples, if known. 0 if not able to
5036 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5039 * This function is the same as av_get_audio_frame_duration(), except it works
5040 * with AVCodecParameters instead of an AVCodecContext.
5042 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
5045 typedef struct AVBitStreamFilterContext {
5047 struct AVBitStreamFilter *filter;
5048 AVCodecParserContext *parser;
5049 struct AVBitStreamFilterContext *next;
5050 } AVBitStreamFilterContext;
5053 typedef struct AVBSFInternal AVBSFInternal;
5056 * The bitstream filter state.
5058 * This struct must be allocated with av_bsf_alloc() and freed with
5061 * The fields in the struct will only be changed (by the caller or by the
5062 * filter) as described in their documentation, and are to be considered
5063 * immutable otherwise.
5065 typedef struct AVBSFContext {
5067 * A class for logging and AVOptions
5069 const AVClass *av_class;
5072 * The bitstream filter this context is an instance of.
5074 const struct AVBitStreamFilter *filter;
5077 * Opaque libavcodec internal data. Must not be touched by the caller in any
5080 AVBSFInternal *internal;
5083 * Opaque filter-specific private data. If filter->priv_class is non-NULL,
5084 * this is an AVOptions-enabled struct.
5089 * Parameters of the input stream. This field is allocated in
5090 * av_bsf_alloc(), it needs to be filled by the caller before
5093 AVCodecParameters *par_in;
5096 * Parameters of the output stream. This field is allocated in
5097 * av_bsf_alloc(), it is set by the filter in av_bsf_init().
5099 AVCodecParameters *par_out;
5102 * The timebase used for the timestamps of the input packets. Set by the
5103 * caller before av_bsf_init().
5105 AVRational time_base_in;
5108 * The timebase used for the timestamps of the output packets. Set by the
5109 * filter in av_bsf_init().
5111 AVRational time_base_out;
5114 typedef struct AVBitStreamFilter {
5118 * A list of codec ids supported by the filter, terminated by
5120 * May be NULL, in that case the bitstream filter works with any codec id.
5122 const enum AVCodecID *codec_ids;
5125 * A class for the private data, used to declare bitstream filter private
5126 * AVOptions. This field is NULL for bitstream filters that do not declare
5129 * If this field is non-NULL, the first member of the filter private data
5130 * must be a pointer to AVClass, which will be set by libavcodec generic
5131 * code to this class.
5133 const AVClass *priv_class;
5135 /*****************************************************************
5136 * No fields below this line are part of the public API. They
5137 * may not be used outside of libavcodec and can be changed and
5139 * New public fields should be added right above.
5140 *****************************************************************
5144 int (*init)(AVBSFContext *ctx);
5145 int (*filter)(AVBSFContext *ctx, AVPacket *pkt);
5146 void (*close)(AVBSFContext *ctx);
5147 } AVBitStreamFilter;
5151 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5152 * is deprecated. Use the new bitstream filtering API (using AVBSFContext).
5154 attribute_deprecated
5155 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5156 attribute_deprecated
5157 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5158 attribute_deprecated
5159 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5160 AVCodecContext *avctx, const char *args,
5161 uint8_t **poutbuf, int *poutbuf_size,
5162 const uint8_t *buf, int buf_size, int keyframe);
5163 attribute_deprecated
5164 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5165 attribute_deprecated
5166 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5170 * @return a bitstream filter with the specified name or NULL if no such
5171 * bitstream filter exists.
5173 const AVBitStreamFilter *av_bsf_get_by_name(const char *name);
5176 * Iterate over all registered bitstream filters.
5178 * @param opaque a pointer where libavcodec will store the iteration state. Must
5179 * point to NULL to start the iteration.
5181 * @return the next registered bitstream filter or NULL when the iteration is
5184 const AVBitStreamFilter *av_bsf_next(void **opaque);
5187 * Allocate a context for a given bitstream filter. The caller must fill in the
5188 * context parameters as described in the documentation and then call
5189 * av_bsf_init() before sending any data to the filter.
5191 * @param filter the filter for which to allocate an instance.
5192 * @param ctx a pointer into which the pointer to the newly-allocated context
5193 * will be written. It must be freed with av_bsf_free() after the
5194 * filtering is done.
5196 * @return 0 on success, a negative AVERROR code on failure
5198 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **ctx);
5201 * Prepare the filter for use, after all the parameters and options have been
5204 int av_bsf_init(AVBSFContext *ctx);
5207 * Submit a packet for filtering.
5209 * After sending each packet, the filter must be completely drained by calling
5210 * av_bsf_receive_packet() repeatedly until it returns AVERROR(EAGAIN) or
5213 * @param pkt the packet to filter. The bitstream filter will take ownership of
5214 * the packet and reset the contents of pkt. pkt is not touched if an error occurs.
5215 * This parameter may be NULL, which signals the end of the stream (i.e. no more
5216 * packets will be sent). That will cause the filter to output any packets it
5217 * may have buffered internally.
5219 * @return 0 on success, a negative AVERROR on error.
5221 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt);
5224 * Retrieve a filtered packet.
5226 * @param[out] pkt this struct will be filled with the contents of the filtered
5227 * packet. It is owned by the caller and must be freed using
5228 * av_packet_unref() when it is no longer needed.
5229 * This parameter should be "clean" (i.e. freshly allocated
5230 * with av_packet_alloc() or unreffed with av_packet_unref())
5231 * when this function is called. If this function returns
5232 * successfully, the contents of pkt will be completely
5233 * overwritten by the returned data. On failure, pkt is not
5236 * @return 0 on success. AVERROR(EAGAIN) if more packets need to be sent to the
5237 * filter (using av_bsf_send_packet()) to get more output. AVERROR_EOF if there
5238 * will be no further output from the filter. Another negative AVERROR value if
5241 * @note one input packet may result in several output packets, so after sending
5242 * a packet with av_bsf_send_packet(), this function needs to be called
5243 * repeatedly until it stops returning 0. It is also possible for a filter to
5244 * output fewer packets than were sent to it, so this function may return
5245 * AVERROR(EAGAIN) immediately after a successful av_bsf_send_packet() call.
5247 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt);
5250 * Free a bitstream filter context and everything associated with it; write NULL
5251 * into the supplied pointer.
5253 void av_bsf_free(AVBSFContext **ctx);
5256 * Get the AVClass for AVBSFContext. It can be used in combination with
5257 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
5259 * @see av_opt_find().
5261 const AVClass *av_bsf_get_class(void);
5266 * Allocate a buffer with padding, reusing the given one if large enough.
5268 * Same behaviour av_fast_malloc but the buffer has additional
5269 * AV_INPUT_PADDING_SIZE at the end which will always memset to 0.
5271 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
5274 * Encode extradata length to a buffer. Used by xiph codecs.
5276 * @param s buffer to write to; must be at least (v/255+1) bytes long
5277 * @param v size of extradata in bytes
5278 * @return number of bytes written to the buffer.
5280 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
5283 * Register the hardware accelerator hwaccel.
5285 void av_register_hwaccel(AVHWAccel *hwaccel);
5288 * If hwaccel is NULL, returns the first registered hardware accelerator,
5289 * if hwaccel is non-NULL, returns the next registered hardware accelerator
5290 * after hwaccel, or NULL if hwaccel is the last one.
5292 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
5296 * Lock operation used by lockmgr
5299 AV_LOCK_CREATE, ///< Create a mutex
5300 AV_LOCK_OBTAIN, ///< Lock the mutex
5301 AV_LOCK_RELEASE, ///< Unlock the mutex
5302 AV_LOCK_DESTROY, ///< Free mutex resources
5306 * Register a user provided lock manager supporting the operations
5307 * specified by AVLockOp. The "mutex" argument to the function points
5308 * to a (void *) where the lockmgr should store/get a pointer to a user
5309 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
5310 * value left by the last call for all other ops. If the lock manager is
5311 * unable to perform the op then it should leave the mutex in the same
5312 * state as when it was called and return a non-zero value. However,
5313 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
5314 * have been successfully destroyed. If av_lockmgr_register succeeds
5315 * it will return a non-negative value, if it fails it will return a
5316 * negative value and destroy all mutex and unregister all callbacks.
5317 * av_lockmgr_register is not thread-safe, it must be called from a
5318 * single thread before any calls which make use of locking are used.
5320 * @param cb User defined callback. av_lockmgr_register invokes calls
5321 * to this callback and the previously registered callback.
5322 * The callback will be used to create more than one mutex
5323 * each of which must be backed by its own underlying locking
5324 * mechanism (i.e. do not use a single static object to
5325 * implement your lock manager). If cb is set to NULL the
5326 * lockmgr will be unregistered.
5328 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
5331 * Get the type of the given codec.
5333 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
5336 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
5337 * with no corresponding avcodec_close()), 0 otherwise.
5339 int avcodec_is_open(AVCodecContext *s);
5342 * @return a non-zero number if codec is an encoder, zero otherwise
5344 int av_codec_is_encoder(const AVCodec *codec);
5347 * @return a non-zero number if codec is a decoder, zero otherwise
5349 int av_codec_is_decoder(const AVCodec *codec);
5352 * @return descriptor for given codec ID or NULL if no descriptor exists.
5354 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
5357 * Iterate over all codec descriptors known to libavcodec.
5359 * @param prev previous descriptor. NULL to get the first descriptor.
5361 * @return next descriptor or NULL after the last descriptor
5363 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
5366 * @return codec descriptor with the given name or NULL if no such descriptor
5369 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
5372 * Allocate a CPB properties structure and initialize its fields to default
5375 * @param size if non-NULL, the size of the allocated struct will be written
5376 * here. This is useful for embedding it in side data.
5378 * @return the newly allocated struct or NULL on failure
5380 AVCPBProperties *av_cpb_properties_alloc(size_t *size);
5386 #endif /* AVCODEC_AVCODEC_H */