2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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/channel_layout.h"
37 #include "libavutil/dict.h"
38 #include "libavutil/frame.h"
39 #include "libavutil/hwcontext.h"
40 #include "libavutil/log.h"
41 #include "libavutil/pixfmt.h"
42 #include "libavutil/rational.h"
47 * @defgroup libavc libavcodec
48 * Encoding/Decoding Library
52 * @defgroup lavc_decoding Decoding
56 * @defgroup lavc_encoding Encoding
60 * @defgroup lavc_codec Codecs
62 * @defgroup lavc_codec_native Native Codecs
65 * @defgroup lavc_codec_wrappers External library wrappers
68 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
72 * @defgroup lavc_internal Internal
80 * @defgroup lavc_encdec send/receive encoding and decoding API overview
83 * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
84 * avcodec_receive_packet() functions provide an encode/decode API, which
85 * decouples input and output.
87 * The API is very similar for encoding/decoding and audio/video, and works as
89 * - Set up and open the AVCodecContext as usual.
91 * - For decoding, call avcodec_send_packet() to give the decoder raw
92 * compressed data in an AVPacket.
93 * - For encoding, call avcodec_send_frame() to give the encoder an AVFrame
94 * containing uncompressed audio or video.
95 * In both cases, it is recommended that AVPackets and AVFrames are
96 * refcounted, or libavcodec might have to copy the input data. (libavformat
97 * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
98 * refcounted AVFrames.)
99 * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
100 * functions and process their output:
101 * - For decoding, call avcodec_receive_frame(). On success, it will return
102 * an AVFrame containing uncompressed audio or video data.
103 * - For encoding, call avcodec_receive_packet(). On success, it will return
104 * an AVPacket with a compressed frame.
105 * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
106 * AVERROR(EAGAIN) return value means that new input data is required to
107 * return new output. In this case, continue with sending input. For each
108 * input frame/packet, the codec will typically return 1 output frame/packet,
109 * but it can also be 0 or more than 1.
111 * At the beginning of decoding or encoding, the codec might accept multiple
112 * input frames/packets without returning a frame, until its internal buffers
113 * are filled. This situation is handled transparently if you follow the steps
116 * In theory, sending input can result in EAGAIN - this should happen only if
117 * not all output was received. You can use this to structure alternative decode
118 * or encode loops other than the one suggested above. For example, you could
119 * try sending new input on each iteration, and try to receive output if that
122 * End of stream situations. These require "flushing" (aka draining) the codec,
123 * as the codec might buffer multiple frames or packets internally for
124 * performance or out of necessity (consider B-frames).
125 * This is handled as follows:
126 * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
127 * or avcodec_send_frame() (encoding) functions. This will enter draining
129 * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
130 * (encoding) in a loop until AVERROR_EOF is returned. The functions will
131 * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
132 * - Before decoding can be resumed again, the codec has to be reset with
133 * avcodec_flush_buffers().
135 * Using the API as outlined above is highly recommended. But it is also
136 * possible to call functions outside of this rigid schema. For example, you can
137 * call avcodec_send_packet() repeatedly without calling
138 * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
139 * until the codec's internal buffer has been filled up (which is typically of
140 * size 1 per output frame, after initial input), and then reject input with
141 * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
142 * read at least some output.
144 * Not all codecs will follow a rigid and predictable dataflow; the only
145 * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
146 * one end implies that a receive/send call on the other end will succeed, or
147 * at least will not fail with AVERROR(EAGAIN). In general, no codec will
148 * 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 AVERROR(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 undefined 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 AVERROR(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 AVERROR(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 AVERROR(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 an 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
231 AV_CODEC_ID_RAWVIDEO,
232 AV_CODEC_ID_MSMPEG4V1,
233 AV_CODEC_ID_MSMPEG4V2,
234 AV_CODEC_ID_MSMPEG4V3,
257 AV_CODEC_ID_INTERPLAY_VIDEO,
264 AV_CODEC_ID_MSVIDEO1,
269 AV_CODEC_ID_TRUEMOTION1,
270 AV_CODEC_ID_VMDVIDEO,
295 AV_CODEC_ID_TRUEMOTION2,
301 AV_CODEC_ID_SMACKVIDEO,
306 AV_CODEC_ID_JPEG2000,
312 AV_CODEC_ID_DSICINVIDEO,
313 AV_CODEC_ID_TIERTEXSEQVIDEO,
321 AV_CODEC_ID_BETHSOFTVID,
333 AV_CODEC_ID_ESCAPE124,
337 AV_CODEC_ID_MOTIONPIXELS,
349 AV_CODEC_ID_FLASHSV2,
350 AV_CODEC_ID_CDGRAPHICS,
353 AV_CODEC_ID_BINKVIDEO,
354 AV_CODEC_ID_IFF_ILBM,
355 #define AV_CODEC_ID_IFF_BYTERUN1 AV_CODEC_ID_IFF_ILBM
361 AV_CODEC_ID_A64_MULTI,
362 AV_CODEC_ID_A64_MULTI5,
365 AV_CODEC_ID_LAGARITH,
369 AV_CODEC_ID_WMV3IMAGE,
370 AV_CODEC_ID_VC1IMAGE,
372 AV_CODEC_ID_BMV_VIDEO,
379 AV_CODEC_ID_ZEROCODEC,
388 AV_CODEC_ID_ESCAPE130,
391 AV_CODEC_ID_HNM4_VIDEO,
393 #define AV_CODEC_ID_H265 AV_CODEC_ID_HEVC
395 AV_CODEC_ID_ALIAS_PIX,
396 AV_CODEC_ID_BRENDER_PIX,
397 AV_CODEC_ID_PAF_VIDEO,
410 AV_CODEC_ID_SCREENPRESSO,
414 AV_CODEC_ID_Y41P = 0x8000,
419 AV_CODEC_ID_TARGA_Y216,
431 AV_CODEC_ID_TRUEMOTION2RT,
433 AV_CODEC_ID_MAGICYUV,
434 AV_CODEC_ID_SHEERVIDEO,
441 AV_CODEC_ID_CLEARVIDEO,
444 AV_CODEC_ID_BITPACKED,
451 AV_CODEC_ID_PROSUMER,
465 /* various PCM "codecs" */
466 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
467 AV_CODEC_ID_PCM_S16LE = 0x10000,
468 AV_CODEC_ID_PCM_S16BE,
469 AV_CODEC_ID_PCM_U16LE,
470 AV_CODEC_ID_PCM_U16BE,
473 AV_CODEC_ID_PCM_MULAW,
474 AV_CODEC_ID_PCM_ALAW,
475 AV_CODEC_ID_PCM_S32LE,
476 AV_CODEC_ID_PCM_S32BE,
477 AV_CODEC_ID_PCM_U32LE,
478 AV_CODEC_ID_PCM_U32BE,
479 AV_CODEC_ID_PCM_S24LE,
480 AV_CODEC_ID_PCM_S24BE,
481 AV_CODEC_ID_PCM_U24LE,
482 AV_CODEC_ID_PCM_U24BE,
483 AV_CODEC_ID_PCM_S24DAUD,
484 AV_CODEC_ID_PCM_ZORK,
485 AV_CODEC_ID_PCM_S16LE_PLANAR,
487 AV_CODEC_ID_PCM_F32BE,
488 AV_CODEC_ID_PCM_F32LE,
489 AV_CODEC_ID_PCM_F64BE,
490 AV_CODEC_ID_PCM_F64LE,
491 AV_CODEC_ID_PCM_BLURAY,
494 AV_CODEC_ID_PCM_S8_PLANAR,
495 AV_CODEC_ID_PCM_S24LE_PLANAR,
496 AV_CODEC_ID_PCM_S32LE_PLANAR,
497 AV_CODEC_ID_PCM_S16BE_PLANAR,
499 AV_CODEC_ID_PCM_S64LE = 0x10800,
500 AV_CODEC_ID_PCM_S64BE,
501 AV_CODEC_ID_PCM_F16LE,
502 AV_CODEC_ID_PCM_F24LE,
503 AV_CODEC_ID_PCM_VIDC,
505 /* various ADPCM codecs */
506 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
507 AV_CODEC_ID_ADPCM_IMA_WAV,
508 AV_CODEC_ID_ADPCM_IMA_DK3,
509 AV_CODEC_ID_ADPCM_IMA_DK4,
510 AV_CODEC_ID_ADPCM_IMA_WS,
511 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
512 AV_CODEC_ID_ADPCM_MS,
513 AV_CODEC_ID_ADPCM_4XM,
514 AV_CODEC_ID_ADPCM_XA,
515 AV_CODEC_ID_ADPCM_ADX,
516 AV_CODEC_ID_ADPCM_EA,
517 AV_CODEC_ID_ADPCM_G726,
518 AV_CODEC_ID_ADPCM_CT,
519 AV_CODEC_ID_ADPCM_SWF,
520 AV_CODEC_ID_ADPCM_YAMAHA,
521 AV_CODEC_ID_ADPCM_SBPRO_4,
522 AV_CODEC_ID_ADPCM_SBPRO_3,
523 AV_CODEC_ID_ADPCM_SBPRO_2,
524 AV_CODEC_ID_ADPCM_THP,
525 AV_CODEC_ID_ADPCM_IMA_AMV,
526 AV_CODEC_ID_ADPCM_EA_R1,
527 AV_CODEC_ID_ADPCM_EA_R3,
528 AV_CODEC_ID_ADPCM_EA_R2,
529 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
530 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
531 AV_CODEC_ID_ADPCM_EA_XAS,
532 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
533 AV_CODEC_ID_ADPCM_IMA_ISS,
534 AV_CODEC_ID_ADPCM_G722,
535 AV_CODEC_ID_ADPCM_IMA_APC,
536 AV_CODEC_ID_ADPCM_VIMA,
538 AV_CODEC_ID_ADPCM_AFC = 0x11800,
539 AV_CODEC_ID_ADPCM_IMA_OKI,
540 AV_CODEC_ID_ADPCM_DTK,
541 AV_CODEC_ID_ADPCM_IMA_RAD,
542 AV_CODEC_ID_ADPCM_G726LE,
543 AV_CODEC_ID_ADPCM_THP_LE,
544 AV_CODEC_ID_ADPCM_PSX,
545 AV_CODEC_ID_ADPCM_AICA,
546 AV_CODEC_ID_ADPCM_IMA_DAT4,
547 AV_CODEC_ID_ADPCM_MTAF,
548 AV_CODEC_ID_ADPCM_AGM,
549 AV_CODEC_ID_ADPCM_ARGO,
550 AV_CODEC_ID_ADPCM_IMA_SSI,
551 AV_CODEC_ID_ADPCM_ZORK,
552 AV_CODEC_ID_ADPCM_IMA_APM,
555 AV_CODEC_ID_AMR_NB = 0x12000,
558 /* RealAudio codecs*/
559 AV_CODEC_ID_RA_144 = 0x13000,
562 /* various DPCM codecs */
563 AV_CODEC_ID_ROQ_DPCM = 0x14000,
564 AV_CODEC_ID_INTERPLAY_DPCM,
565 AV_CODEC_ID_XAN_DPCM,
566 AV_CODEC_ID_SOL_DPCM,
568 AV_CODEC_ID_SDX2_DPCM = 0x14800,
569 AV_CODEC_ID_GREMLIN_DPCM,
572 AV_CODEC_ID_MP2 = 0x15000,
573 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
583 AV_CODEC_ID_VMDAUDIO,
589 AV_CODEC_ID_WESTWOOD_SND1,
590 AV_CODEC_ID_GSM, ///< as in Berlin toast format
593 AV_CODEC_ID_TRUESPEECH,
595 AV_CODEC_ID_SMACKAUDIO,
598 AV_CODEC_ID_DSICINAUDIO,
600 AV_CODEC_ID_MUSEPACK7,
602 AV_CODEC_ID_GSM_MS, /* as found in WAV */
605 AV_CODEC_ID_NELLYMOSER,
606 AV_CODEC_ID_MUSEPACK8,
608 AV_CODEC_ID_WMAVOICE,
610 AV_CODEC_ID_WMALOSSLESS,
619 AV_CODEC_ID_BINKAUDIO_RDFT,
620 AV_CODEC_ID_BINKAUDIO_DCT,
621 AV_CODEC_ID_AAC_LATM,
626 AV_CODEC_ID_8SVX_EXP,
627 AV_CODEC_ID_8SVX_FIB,
628 AV_CODEC_ID_BMV_AUDIO,
633 AV_CODEC_ID_COMFORT_NOISE,
635 AV_CODEC_ID_METASOUND,
636 AV_CODEC_ID_PAF_AUDIO,
641 AV_CODEC_ID_FFWAVESYNTH = 0x15800,
643 AV_CODEC_ID_SONIC_LS,
646 AV_CODEC_ID_DSD_LSBF,
647 AV_CODEC_ID_DSD_MSBF,
648 AV_CODEC_ID_DSD_LSBF_PLANAR,
649 AV_CODEC_ID_DSD_MSBF_PLANAR,
651 AV_CODEC_ID_INTERPLAY_ACM,
655 AV_CODEC_ID_ATRAC3AL,
656 AV_CODEC_ID_ATRAC3PAL,
663 AV_CODEC_ID_ACELP_KELVIN,
664 AV_CODEC_ID_MPEGH_3D_AUDIO,
667 /* subtitle codecs */
668 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
669 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
670 AV_CODEC_ID_DVB_SUBTITLE,
671 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
674 AV_CODEC_ID_MOV_TEXT,
675 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
676 AV_CODEC_ID_DVB_TELETEXT,
679 AV_CODEC_ID_MICRODVD = 0x17800,
683 AV_CODEC_ID_REALTEXT,
685 AV_CODEC_ID_SUBVIEWER1,
686 AV_CODEC_ID_SUBVIEWER,
693 AV_CODEC_ID_HDMV_TEXT_SUBTITLE,
695 AV_CODEC_ID_ARIB_CAPTION,
697 /* other specific kind of codecs (generally used for attachments) */
698 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
699 AV_CODEC_ID_TTF = 0x18000,
701 AV_CODEC_ID_SCTE_35, ///< Contain timestamp estimated through PCR of program stream.
703 AV_CODEC_ID_BINTEXT = 0x18800,
707 AV_CODEC_ID_SMPTE_KLV,
709 AV_CODEC_ID_TIMED_ID3,
710 AV_CODEC_ID_BIN_DATA,
713 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
715 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
716 * stream (only used by libavformat) */
717 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
718 * stream (only used by libavformat) */
719 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
720 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
724 * This struct describes the properties of a single codec described by an
726 * @see avcodec_descriptor_get()
728 typedef struct AVCodecDescriptor {
730 enum AVMediaType type;
732 * Name of the codec described by this descriptor. It is non-empty and
733 * unique for each codec descriptor. It should contain alphanumeric
734 * characters and '_' only.
738 * A more descriptive name for this codec. May be NULL.
740 const char *long_name;
742 * Codec properties, a combination of AV_CODEC_PROP_* flags.
746 * MIME type(s) associated with the codec.
747 * May be NULL; if not, a NULL-terminated array of MIME types.
748 * The first item is always non-NULL and is the preferred MIME type.
750 const char *const *mime_types;
752 * If non-NULL, an array of profiles recognized for this codec.
753 * Terminated with FF_PROFILE_UNKNOWN.
755 const struct AVProfile *profiles;
759 * Codec uses only intra compression.
760 * Video and audio codecs only.
762 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
764 * Codec supports lossy compression. Audio and video codecs only.
765 * @note a codec may support both lossy and lossless
768 #define AV_CODEC_PROP_LOSSY (1 << 1)
770 * Codec supports lossless compression. Audio and video codecs only.
772 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
774 * Codec supports frame reordering. That is, the coded order (the order in which
775 * the encoded packets are output by the encoders / stored / input to the
776 * decoders) may be different from the presentation order of the corresponding
779 * For codecs that do not have this property set, PTS and DTS should always be
782 #define AV_CODEC_PROP_REORDER (1 << 3)
784 * Subtitle codec is bitmap based
785 * Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.
787 #define AV_CODEC_PROP_BITMAP_SUB (1 << 16)
789 * Subtitle codec is text based.
790 * Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.
792 #define AV_CODEC_PROP_TEXT_SUB (1 << 17)
795 * @ingroup lavc_decoding
796 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
797 * This is mainly needed because some optimized bitstream readers read
798 * 32 or 64 bit at once and could read over the end.<br>
799 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
800 * MPEG bitstreams could cause overread and segfault.
802 #define AV_INPUT_BUFFER_PADDING_SIZE 64
805 * @ingroup lavc_encoding
806 * minimum encoding buffer size
807 * Used to avoid some checks during header writing.
809 #define AV_INPUT_BUFFER_MIN_SIZE 16384
812 * @ingroup lavc_decoding
815 /* We leave some space between them for extensions (drop some
816 * keyframes for intra-only or drop just some bidir frames). */
817 AVDISCARD_NONE =-16, ///< discard nothing
818 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
819 AVDISCARD_NONREF = 8, ///< discard all non reference
820 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
821 AVDISCARD_NONINTRA= 24, ///< discard all non intra frames
822 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
823 AVDISCARD_ALL = 48, ///< discard all
826 enum AVAudioServiceType {
827 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
828 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
829 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
830 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
831 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
832 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
833 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
834 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
835 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
836 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
840 * @ingroup lavc_encoding
842 typedef struct RcOverride{
845 int qscale; // If this is 0 then quality_factor will be used instead.
846 float quality_factor;
850 These flags can be passed in AVCodecContext.flags before initialization.
851 Note: Not everything is supported yet.
855 * Allow decoders to produce frames with data planes that are not aligned
856 * to CPU requirements (e.g. due to cropping).
858 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
862 #define AV_CODEC_FLAG_QSCALE (1 << 1)
864 * 4 MV per MB allowed / advanced prediction for H.263.
866 #define AV_CODEC_FLAG_4MV (1 << 2)
868 * Output even those frames that might be corrupted.
870 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
874 #define AV_CODEC_FLAG_QPEL (1 << 4)
876 * Don't output frames whose parameters differ from first
877 * decoded frame in stream.
879 #define AV_CODEC_FLAG_DROPCHANGED (1 << 5)
881 * Use internal 2pass ratecontrol in first pass mode.
883 #define AV_CODEC_FLAG_PASS1 (1 << 9)
885 * Use internal 2pass ratecontrol in second pass mode.
887 #define AV_CODEC_FLAG_PASS2 (1 << 10)
891 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
893 * Only decode/encode grayscale.
895 #define AV_CODEC_FLAG_GRAY (1 << 13)
897 * error[?] variables will be set during encoding.
899 #define AV_CODEC_FLAG_PSNR (1 << 15)
901 * Input bitstream might be truncated at a random location
902 * instead of only at frame boundaries.
904 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
906 * Use interlaced DCT.
908 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
912 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
914 * Place global headers in extradata instead of every keyframe.
916 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
918 * Use only bitexact stuff (except (I)DCT).
920 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
921 /* Fx : Flag for H.263+ extra options */
923 * H.263 advanced intra coding / MPEG-4 AC prediction
925 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
927 * interlaced motion estimation
929 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
930 #define AV_CODEC_FLAG_CLOSED_GOP (1U << 31)
933 * Allow non spec compliant speedup tricks.
935 #define AV_CODEC_FLAG2_FAST (1 << 0)
937 * Skip bitstream encoding.
939 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
941 * Place global headers at every keyframe instead of in extradata.
943 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
946 * timecode is in drop frame format. DEPRECATED!!!!
948 #define AV_CODEC_FLAG2_DROP_FRAME_TIMECODE (1 << 13)
951 * Input bitstream might be truncated at a packet boundaries
952 * instead of only at frame boundaries.
954 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
956 * Discard cropping information from SPS.
958 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
961 * Show all frames before the first keyframe
963 #define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)
965 * Export motion vectors through frame side data
967 #define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)
969 * Do not skip samples and export skip information as frame side data
971 #define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)
973 * Do not reset ASS ReadOrder field on flush (subtitles decoding)
975 #define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)
977 /* Unsupported options :
978 * Syntax Arithmetic coding (SAC)
979 * Reference Picture Selection
980 * Independent Segment Decoding */
982 /* codec capabilities */
985 * Decoder can use draw_horiz_band callback.
987 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
989 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
990 * If not set, it might not use get_buffer() at all or use operations that
991 * assume the buffer was allocated by avcodec_default_get_buffer.
993 #define AV_CODEC_CAP_DR1 (1 << 1)
994 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
996 * Encoder or decoder requires flushing with NULL input at the end in order to
997 * give the complete and correct output.
999 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
1000 * with NULL data. The user can still send NULL data to the public encode
1001 * or decode function, but libavcodec will not pass it along to the codec
1002 * unless this flag is set.
1005 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
1006 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
1010 * The encoder needs to be fed with NULL data at the end of encoding until the
1011 * encoder no longer returns data.
1013 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
1014 * flag also means that the encoder must set the pts and duration for
1015 * each output packet. If this flag is not set, the pts and duration will
1016 * be determined by libavcodec from the input frame.
1018 #define AV_CODEC_CAP_DELAY (1 << 5)
1020 * Codec can be fed a final frame with a smaller size.
1021 * This can be used to prevent truncation of the last audio samples.
1023 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
1026 * Codec can output multiple frames per AVPacket
1027 * Normally demuxers return one frame at a time, demuxers which do not do
1028 * are connected to a parser to split what they return into proper frames.
1029 * This flag is reserved to the very rare category of codecs which have a
1030 * bitstream that cannot be split into frames without timeconsuming
1031 * operations like full decoding. Demuxers carrying such bitstreams thus
1032 * may return multiple frames in a packet. This has many disadvantages like
1033 * prohibiting stream copy in many cases thus it should only be considered
1036 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
1038 * Codec is experimental and is thus avoided in favor of non experimental
1041 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
1043 * Codec should fill in channel configuration and samplerate instead of container
1045 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
1047 * Codec supports frame-level multithreading.
1049 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
1051 * Codec supports slice-based (or partition-based) multithreading.
1053 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
1055 * Codec supports changed parameters at any point.
1057 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
1059 * Codec supports avctx->thread_count == 0 (auto).
1061 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
1063 * Audio encoder supports receiving a different number of samples in each call.
1065 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
1067 * Decoder is not a preferred choice for probing.
1068 * This indicates that the decoder is not a good choice for probing.
1069 * It could for example be an expensive to spin up hardware decoder,
1070 * or it could simply not provide a lot of useful information about
1072 * A decoder marked with this flag should only be used as last resort
1073 * choice for probing.
1075 #define AV_CODEC_CAP_AVOID_PROBING (1 << 17)
1077 * Codec is intra only.
1079 #define AV_CODEC_CAP_INTRA_ONLY 0x40000000
1081 * Codec is lossless.
1083 #define AV_CODEC_CAP_LOSSLESS 0x80000000
1086 * Codec is backed by a hardware implementation. Typically used to
1087 * identify a non-hwaccel hardware decoder. For information about hwaccels, use
1088 * avcodec_get_hw_config() instead.
1090 #define AV_CODEC_CAP_HARDWARE (1 << 18)
1093 * Codec is potentially backed by a hardware implementation, but not
1094 * necessarily. This is used instead of AV_CODEC_CAP_HARDWARE, if the
1095 * implementation provides some sort of internal fallback.
1097 #define AV_CODEC_CAP_HYBRID (1 << 19)
1100 * This codec takes the reordered_opaque field from input AVFrames
1101 * and returns it in the corresponding field in AVCodecContext after
1104 #define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE (1 << 20)
1108 * This specifies the area which should be displayed.
1109 * Note there may be multiple such areas for one frame.
1111 typedef struct AVPanScan {
1114 * - encoding: Set by user.
1115 * - decoding: Set by libavcodec.
1120 * width and height in 1/16 pel
1121 * - encoding: Set by user.
1122 * - decoding: Set by libavcodec.
1128 * position of the top left corner in 1/16 pel for up to 3 fields/frames
1129 * - encoding: Set by user.
1130 * - decoding: Set by libavcodec.
1132 int16_t position[3][2];
1136 * This structure describes the bitrate properties of an encoded bitstream. It
1137 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
1138 * parameters for H.264/HEVC.
1140 typedef struct AVCPBProperties {
1142 * Maximum bitrate of the stream, in bits per second.
1143 * Zero if unknown or unspecified.
1145 #if FF_API_UNSANITIZED_BITRATES
1148 int64_t max_bitrate;
1151 * Minimum bitrate of the stream, in bits per second.
1152 * Zero if unknown or unspecified.
1154 #if FF_API_UNSANITIZED_BITRATES
1157 int64_t min_bitrate;
1160 * Average bitrate of the stream, in bits per second.
1161 * Zero if unknown or unspecified.
1163 #if FF_API_UNSANITIZED_BITRATES
1166 int64_t avg_bitrate;
1170 * The size of the buffer to which the ratecontrol is applied, in bits.
1171 * Zero if unknown or unspecified.
1176 * The delay between the time the packet this structure is associated with
1177 * is received and the time when it should be decoded, in periods of a 27MHz
1180 * UINT64_MAX when unknown or unspecified.
1185 typedef struct AVProducerReferenceTime {
1188 } AVProducerReferenceTime;
1191 * The decoder will keep a reference to the frame and may reuse it later.
1193 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
1196 * @defgroup lavc_packet AVPacket
1198 * Types and functions for working with AVPacket.
1201 enum AVPacketSideDataType {
1203 * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
1204 * bytes worth of palette. This side data signals that a new palette is
1207 AV_PKT_DATA_PALETTE,
1210 * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
1211 * that the extradata buffer was changed and the receiving side should
1212 * act upon it appropriately. The new extradata is embedded in the side
1213 * data buffer and should be immediately used for processing the current
1216 AV_PKT_DATA_NEW_EXTRADATA,
1219 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
1222 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
1223 * s32le channel_count
1224 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
1225 * u64le channel_layout
1226 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
1228 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
1233 AV_PKT_DATA_PARAM_CHANGE,
1236 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1237 * structures with info about macroblocks relevant to splitting the
1238 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1239 * That is, it does not necessarily contain info about all macroblocks,
1240 * as long as the distance between macroblocks in the info is smaller
1241 * than the target payload size.
1242 * Each MB info structure is 12 bytes, and is laid out as follows:
1244 * u32le bit offset from the start of the packet
1245 * u8 current quantizer at the start of the macroblock
1247 * u16le macroblock address within the GOB
1248 * u8 horizontal MV predictor
1249 * u8 vertical MV predictor
1250 * u8 horizontal MV predictor for block number 3
1251 * u8 vertical MV predictor for block number 3
1254 AV_PKT_DATA_H263_MB_INFO,
1257 * This side data should be associated with an audio stream and contains
1258 * ReplayGain information in form of the AVReplayGain struct.
1260 AV_PKT_DATA_REPLAYGAIN,
1263 * This side data contains a 3x3 transformation matrix describing an affine
1264 * transformation that needs to be applied to the decoded video frames for
1265 * correct presentation.
1267 * See libavutil/display.h for a detailed description of the data.
1269 AV_PKT_DATA_DISPLAYMATRIX,
1272 * This side data should be associated with a video stream and contains
1273 * Stereoscopic 3D information in form of the AVStereo3D struct.
1275 AV_PKT_DATA_STEREO3D,
1278 * This side data should be associated with an audio stream and corresponds
1279 * to enum AVAudioServiceType.
1281 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1284 * This side data contains quality related information from the encoder.
1286 * u32le quality factor of the compressed frame. Allowed range is between 1 (good) and FF_LAMBDA_MAX (bad).
1290 * u64le[error count] sum of squared differences between encoder in and output
1293 AV_PKT_DATA_QUALITY_STATS,
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 * Recommmends skipping the specified number of samples
1311 * u32le number of samples to skip from start of this packet
1312 * u32le number of samples to skip from end of this packet
1313 * u8 reason for start skip
1314 * u8 reason for end skip (0=padding silence, 1=convergence)
1317 AV_PKT_DATA_SKIP_SAMPLES,
1320 * An AV_PKT_DATA_JP_DUALMONO side data packet indicates that
1321 * the packet may contain "dual mono" audio specific to Japanese DTV
1322 * and if it is true, recommends only the selected channel to be used.
1324 * u8 selected channels (0=mail/left, 1=sub/right, 2=both)
1327 AV_PKT_DATA_JP_DUALMONO,
1330 * A list of zero terminated key/value strings. There is no end marker for
1331 * the list, so it is required to rely on the side data size to stop.
1333 AV_PKT_DATA_STRINGS_METADATA,
1336 * Subtitle event position
1344 AV_PKT_DATA_SUBTITLE_POSITION,
1347 * Data found in BlockAdditional element of matroska container. There is
1348 * no end marker for the data, so it is required to rely on the side data
1349 * size to recognize the end. 8 byte id (as found in BlockAddId) followed
1352 AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
1355 * The optional first identifier line of a WebVTT cue.
1357 AV_PKT_DATA_WEBVTT_IDENTIFIER,
1360 * The optional settings (rendering instructions) that immediately
1361 * follow the timestamp specifier of a WebVTT cue.
1363 AV_PKT_DATA_WEBVTT_SETTINGS,
1366 * A list of zero terminated key/value strings. There is no end marker for
1367 * the list, so it is required to rely on the side data size to stop. This
1368 * side data includes updated metadata which appeared in the stream.
1370 AV_PKT_DATA_METADATA_UPDATE,
1373 * MPEGTS stream ID as uint8_t, this is required to pass the stream ID
1374 * information from the demuxer to the corresponding muxer.
1376 AV_PKT_DATA_MPEGTS_STREAM_ID,
1379 * Mastering display metadata (based on SMPTE-2086:2014). This metadata
1380 * should be associated with a video stream and contains data in the form
1381 * of the AVMasteringDisplayMetadata struct.
1383 AV_PKT_DATA_MASTERING_DISPLAY_METADATA,
1386 * This side data should be associated with a video stream and corresponds
1387 * to the AVSphericalMapping structure.
1389 AV_PKT_DATA_SPHERICAL,
1392 * Content light level (based on CTA-861.3). This metadata should be
1393 * associated with a video stream and contains data in the form of the
1394 * AVContentLightMetadata struct.
1396 AV_PKT_DATA_CONTENT_LIGHT_LEVEL,
1399 * ATSC A53 Part 4 Closed Captions. This metadata should be associated with
1400 * a video stream. A53 CC bitstream is stored as uint8_t in AVPacketSideData.data.
1401 * The number of bytes of CC data is AVPacketSideData.size.
1406 * This side data is encryption initialization data.
1407 * The format is not part of ABI, use av_encryption_init_info_* methods to
1410 AV_PKT_DATA_ENCRYPTION_INIT_INFO,
1413 * This side data contains encryption info for how to decrypt the packet.
1414 * The format is not part of ABI, use av_encryption_info_* methods to access.
1416 AV_PKT_DATA_ENCRYPTION_INFO,
1419 * Active Format Description data consisting of a single byte as specified
1420 * in ETSI TS 101 154 using AVActiveFormatDescription enum.
1425 * Producer Reference Time data corresponding to the AVProducerReferenceTime struct.
1430 * The number of side data types.
1431 * This is not part of the public API/ABI in the sense that it may
1432 * change when new side data types are added.
1433 * This must stay the last enum value.
1434 * If its value becomes huge, some code using it
1435 * needs to be updated as it assumes it to be smaller than other limits.
1440 #define AV_PKT_DATA_QUALITY_FACTOR AV_PKT_DATA_QUALITY_STATS //DEPRECATED
1442 typedef struct AVPacketSideData {
1445 enum AVPacketSideDataType type;
1449 * This structure stores compressed data. It is typically exported by demuxers
1450 * and then passed as input to decoders, or received as output from encoders and
1451 * then passed to muxers.
1453 * For video, it should typically contain one compressed frame. For audio it may
1454 * contain several compressed frames. Encoders are allowed to output empty
1455 * packets, with no compressed data, containing only side data
1456 * (e.g. to update some stream parameters at the end of encoding).
1458 * AVPacket is one of the few structs in FFmpeg, whose size is a part of public
1459 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1460 * without libavcodec and libavformat major bump.
1462 * The semantics of data ownership depends on the buf field.
1463 * If it is set, the packet data is dynamically allocated and is
1464 * valid indefinitely until a call to av_packet_unref() reduces the
1465 * reference count to 0.
1467 * If the buf field is not set av_packet_ref() would make a copy instead
1468 * of increasing the reference count.
1470 * The side data is always allocated with av_malloc(), copied by
1471 * av_packet_ref() and freed by av_packet_unref().
1473 * @see av_packet_ref
1474 * @see av_packet_unref
1476 typedef struct AVPacket {
1478 * A reference to the reference-counted buffer where the packet data is
1480 * May be NULL, then the packet data is not reference-counted.
1484 * Presentation timestamp in AVStream->time_base units; the time at which
1485 * the decompressed packet will be presented to the user.
1486 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1487 * pts MUST be larger or equal to dts as presentation cannot happen before
1488 * decompression, unless one wants to view hex dumps. Some formats misuse
1489 * the terms dts and pts/cts to mean something different. Such timestamps
1490 * must be converted to true pts/dts before they are stored in AVPacket.
1494 * Decompression timestamp in AVStream->time_base units; the time at which
1495 * the packet is decompressed.
1496 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1503 * A combination of AV_PKT_FLAG values
1507 * Additional packet data that can be provided by the container.
1508 * Packet can contain several types of side information.
1510 AVPacketSideData *side_data;
1511 int side_data_elems;
1514 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1515 * Equals next_pts - this_pts in presentation order.
1519 int64_t pos; ///< byte position in stream, -1 if unknown
1521 #if FF_API_CONVERGENCE_DURATION
1523 * @deprecated Same as the duration field, but as int64_t. This was required
1524 * for Matroska subtitles, whose duration values could overflow when the
1525 * duration field was still an int.
1527 attribute_deprecated
1528 int64_t convergence_duration;
1531 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1532 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1534 * Flag is used to discard packets which are required to maintain valid
1535 * decoder state but are not required for output and should be dropped
1538 #define AV_PKT_FLAG_DISCARD 0x0004
1540 * The packet comes from a trusted source.
1542 * Otherwise-unsafe constructs such as arbitrary pointers to data
1543 * outside the packet may be followed.
1545 #define AV_PKT_FLAG_TRUSTED 0x0008
1547 * Flag is used to indicate packets that contain frames that can
1548 * be discarded by the decoder. I.e. Non-reference frames.
1550 #define AV_PKT_FLAG_DISPOSABLE 0x0010
1553 enum AVSideDataParamChangeFlags {
1554 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1555 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1556 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1557 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1563 struct AVCodecInternal;
1567 AV_FIELD_PROGRESSIVE,
1568 AV_FIELD_TT, //< Top coded_first, top displayed first
1569 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1570 AV_FIELD_TB, //< Top coded first, bottom displayed first
1571 AV_FIELD_BT, //< Bottom coded first, top displayed first
1575 * main external API structure.
1576 * New fields can be added to the end with minor version bumps.
1577 * Removal, reordering and changes to existing fields require a major
1579 * You can use AVOptions (av_opt* / av_set/get*()) to access these fields from user
1581 * The name string for AVOptions options matches the associated command line
1582 * parameter name and can be found in libavcodec/options_table.h
1583 * The AVOption/command line parameter names differ in some cases from the C
1584 * structure field names for historic reasons or brevity.
1585 * sizeof(AVCodecContext) must not be used outside libav*.
1587 typedef struct AVCodecContext {
1589 * information on struct for av_log
1590 * - set by avcodec_alloc_context3
1592 const AVClass *av_class;
1593 int log_level_offset;
1595 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1596 const struct AVCodec *codec;
1597 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1600 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1601 * This is used to work around some encoder bugs.
1602 * A demuxer should set this to what is stored in the field used to identify the codec.
1603 * If there are multiple such fields in a container then the demuxer should choose the one
1604 * which maximizes the information about the used codec.
1605 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1606 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1607 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1609 * - encoding: Set by user, if not then the default based on codec_id will be used.
1610 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1612 unsigned int codec_tag;
1617 * Private context used for internal data.
1619 * Unlike priv_data, this is not codec-specific. It is used in general
1620 * libavcodec functions.
1622 struct AVCodecInternal *internal;
1625 * Private data of the user, can be used to carry app specific stuff.
1626 * - encoding: Set by user.
1627 * - decoding: Set by user.
1632 * the average bitrate
1633 * - encoding: Set by user; unused for constant quantizer encoding.
1634 * - decoding: Set by user, may be overwritten by libavcodec
1635 * if this info is available in the stream
1640 * number of bits the bitstream is allowed to diverge from the reference.
1641 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1642 * - encoding: Set by user; unused for constant quantizer encoding.
1643 * - decoding: unused
1645 int bit_rate_tolerance;
1648 * Global quality for codecs which cannot change it per frame.
1649 * This should be proportional to MPEG-1/2/4 qscale.
1650 * - encoding: Set by user.
1651 * - decoding: unused
1656 * - encoding: Set by user.
1657 * - decoding: unused
1659 int compression_level;
1660 #define FF_COMPRESSION_DEFAULT -1
1664 * - encoding: Set by user.
1665 * - decoding: Set by user.
1671 * - encoding: Set by user.
1672 * - decoding: Set by user.
1677 * some codecs need / can use extradata like Huffman tables.
1678 * MJPEG: Huffman tables
1679 * rv10: additional flags
1680 * MPEG-4: global headers (they can be in the bitstream or here)
1681 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1682 * than extradata_size to avoid problems if it is read with the bitstream reader.
1683 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1684 * Must be allocated with the av_malloc() family of functions.
1685 * - encoding: Set/allocated/freed by libavcodec.
1686 * - decoding: Set/allocated/freed by user.
1692 * This is the fundamental unit of time (in seconds) in terms
1693 * of which frame timestamps are represented. For fixed-fps content,
1694 * timebase should be 1/framerate and timestamp increments should be
1696 * This often, but not always is the inverse of the frame rate or field rate
1697 * for video. 1/time_base is not the average frame rate if the frame rate is not
1700 * Like containers, elementary streams also can store timestamps, 1/time_base
1701 * is the unit in which these timestamps are specified.
1702 * As example of such codec time base see ISO/IEC 14496-2:2001(E)
1703 * vop_time_increment_resolution and fixed_vop_rate
1704 * (fixed_vop_rate == 0 implies that it is different from the framerate)
1706 * - encoding: MUST be set by user.
1707 * - decoding: the use of this field for decoding is deprecated.
1708 * Use framerate instead.
1710 AVRational time_base;
1713 * For some codecs, the time base is closer to the field rate than the frame rate.
1714 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1715 * if no telecine is used ...
1717 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1719 int ticks_per_frame;
1724 * Encoding: Number of frames delay there will be from the encoder input to
1725 * the decoder output. (we assume the decoder matches the spec)
1726 * Decoding: Number of frames delay in addition to what a standard decoder
1727 * as specified in the spec would produce.
1730 * Number of frames the decoded output will be delayed relative to the
1734 * For encoding, this field is unused (see initial_padding).
1736 * For decoding, this is the number of samples the decoder needs to
1737 * output before the decoder's output is valid. When seeking, you should
1738 * start decoding this many samples prior to your desired seek point.
1740 * - encoding: Set by libavcodec.
1741 * - decoding: Set by libavcodec.
1748 * picture width / height.
1750 * @note Those fields may not match the values of the last
1751 * AVFrame output by avcodec_decode_video2 due frame
1754 * - encoding: MUST be set by user.
1755 * - decoding: May be set by the user before opening the decoder if known e.g.
1756 * from the container. Some decoders will require the dimensions
1757 * to be set by the caller. During decoding, the decoder may
1758 * overwrite those values as required while parsing the data.
1763 * Bitstream width / height, may be different from width/height e.g. when
1764 * the decoded frame is cropped before being output or lowres is enabled.
1766 * @note Those field may not match the value of the last
1767 * AVFrame output by avcodec_receive_frame() due frame
1770 * - encoding: unused
1771 * - decoding: May be set by the user before opening the decoder if known
1772 * e.g. from the container. During decoding, the decoder may
1773 * overwrite those values as required while parsing the data.
1775 int coded_width, coded_height;
1778 * the number of pictures in a group of pictures, or 0 for intra_only
1779 * - encoding: Set by user.
1780 * - decoding: unused
1785 * Pixel format, see AV_PIX_FMT_xxx.
1786 * May be set by the demuxer if known from headers.
1787 * May be overridden by the decoder if it knows better.
1789 * @note This field may not match the value of the last
1790 * AVFrame output by avcodec_receive_frame() due frame
1793 * - encoding: Set by user.
1794 * - decoding: Set by user if known, overridden by libavcodec while
1797 enum AVPixelFormat pix_fmt;
1800 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1801 * decoder to draw a horizontal band. It improves cache usage. Not
1802 * all codecs can do that. You must check the codec capabilities
1804 * When multithreading is used, it may be called from multiple threads
1805 * at the same time; threads might draw different parts of the same AVFrame,
1806 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1808 * The function is also used by hardware acceleration APIs.
1809 * It is called at least once during frame decoding to pass
1810 * the data needed for hardware render.
1811 * In that mode instead of pixel data, AVFrame points to
1812 * a structure specific to the acceleration API. The application
1813 * reads the structure and can change some fields to indicate progress
1815 * - encoding: unused
1816 * - decoding: Set by user.
1817 * @param height the height of the slice
1818 * @param y the y position of the slice
1819 * @param type 1->top field, 2->bottom field, 3->frame
1820 * @param offset offset into the AVFrame.data from which the slice should be read
1822 void (*draw_horiz_band)(struct AVCodecContext *s,
1823 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1824 int y, int type, int height);
1827 * callback to negotiate the pixelFormat
1828 * @param fmt is the list of formats which are supported by the codec,
1829 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1830 * The first is always the native one.
1831 * @note The callback may be called again immediately if initialization for
1832 * the selected (hardware-accelerated) pixel format failed.
1833 * @warning Behavior is undefined if the callback returns a value not
1834 * in the fmt list of formats.
1835 * @return the chosen format
1836 * - encoding: unused
1837 * - decoding: Set by user, if not set the native format will be chosen.
1839 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1842 * maximum number of B-frames between non-B-frames
1843 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1844 * - encoding: Set by user.
1845 * - decoding: unused
1850 * qscale factor between IP and B-frames
1851 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1852 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1853 * - encoding: Set by user.
1854 * - decoding: unused
1856 float b_quant_factor;
1858 #if FF_API_PRIVATE_OPT
1859 /** @deprecated use encoder private options instead */
1860 attribute_deprecated
1861 int b_frame_strategy;
1865 * qscale offset between IP and B-frames
1866 * - encoding: Set by user.
1867 * - decoding: unused
1869 float b_quant_offset;
1872 * Size of the frame reordering buffer in the decoder.
1873 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1874 * - encoding: Set by libavcodec.
1875 * - decoding: Set by libavcodec.
1879 #if FF_API_PRIVATE_OPT
1880 /** @deprecated use encoder private options instead */
1881 attribute_deprecated
1886 * qscale factor between P- and I-frames
1887 * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
1888 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1889 * - encoding: Set by user.
1890 * - decoding: unused
1892 float i_quant_factor;
1895 * qscale offset between P and I-frames
1896 * - encoding: Set by user.
1897 * - decoding: unused
1899 float i_quant_offset;
1902 * luminance masking (0-> disabled)
1903 * - encoding: Set by user.
1904 * - decoding: unused
1909 * temporary complexity masking (0-> disabled)
1910 * - encoding: Set by user.
1911 * - decoding: unused
1913 float temporal_cplx_masking;
1916 * spatial complexity masking (0-> disabled)
1917 * - encoding: Set by user.
1918 * - decoding: unused
1920 float spatial_cplx_masking;
1923 * p block masking (0-> disabled)
1924 * - encoding: Set by user.
1925 * - decoding: unused
1930 * darkness masking (0-> disabled)
1931 * - encoding: Set by user.
1932 * - decoding: unused
1938 * - encoding: Set by libavcodec.
1939 * - decoding: Set by user (or 0).
1943 #if FF_API_PRIVATE_OPT
1944 /** @deprecated use encoder private options instead */
1945 attribute_deprecated
1946 int prediction_method;
1947 #define FF_PRED_LEFT 0
1948 #define FF_PRED_PLANE 1
1949 #define FF_PRED_MEDIAN 2
1953 * slice offsets in the frame in bytes
1954 * - encoding: Set/allocated by libavcodec.
1955 * - decoding: Set/allocated by user (or NULL).
1960 * sample aspect ratio (0 if unknown)
1961 * That is the width of a pixel divided by the height of the pixel.
1962 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1963 * - encoding: Set by user.
1964 * - decoding: Set by libavcodec.
1966 AVRational sample_aspect_ratio;
1969 * motion estimation comparison function
1970 * - encoding: Set by user.
1971 * - decoding: unused
1975 * subpixel motion estimation comparison function
1976 * - encoding: Set by user.
1977 * - decoding: unused
1981 * macroblock comparison function (not supported yet)
1982 * - encoding: Set by user.
1983 * - decoding: unused
1987 * interlaced DCT comparison function
1988 * - encoding: Set by user.
1989 * - decoding: unused
1992 #define FF_CMP_SAD 0
1993 #define FF_CMP_SSE 1
1994 #define FF_CMP_SATD 2
1995 #define FF_CMP_DCT 3
1996 #define FF_CMP_PSNR 4
1997 #define FF_CMP_BIT 5
1999 #define FF_CMP_ZERO 7
2000 #define FF_CMP_VSAD 8
2001 #define FF_CMP_VSSE 9
2002 #define FF_CMP_NSSE 10
2003 #define FF_CMP_W53 11
2004 #define FF_CMP_W97 12
2005 #define FF_CMP_DCTMAX 13
2006 #define FF_CMP_DCT264 14
2007 #define FF_CMP_MEDIAN_SAD 15
2008 #define FF_CMP_CHROMA 256
2011 * ME diamond size & shape
2012 * - encoding: Set by user.
2013 * - decoding: unused
2018 * amount of previous MV predictors (2a+1 x 2a+1 square)
2019 * - encoding: Set by user.
2020 * - decoding: unused
2022 int last_predictor_count;
2024 #if FF_API_PRIVATE_OPT
2025 /** @deprecated use encoder private options instead */
2026 attribute_deprecated
2031 * motion estimation prepass comparison function
2032 * - encoding: Set by user.
2033 * - decoding: unused
2038 * ME prepass diamond size & shape
2039 * - encoding: Set by user.
2040 * - decoding: unused
2046 * - encoding: Set by user.
2047 * - decoding: unused
2049 int me_subpel_quality;
2052 * maximum motion estimation search range in subpel units
2053 * If 0 then no limit.
2055 * - encoding: Set by user.
2056 * - decoding: unused
2062 * - encoding: unused
2063 * - decoding: Set by user.
2066 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
2067 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
2068 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
2071 * macroblock decision mode
2072 * - encoding: Set by user.
2073 * - decoding: unused
2076 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
2077 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
2078 #define FF_MB_DECISION_RD 2 ///< rate distortion
2081 * custom intra quantization matrix
2082 * Must be allocated with the av_malloc() family of functions, and will be freed in
2083 * avcodec_free_context().
2084 * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
2085 * - decoding: Set/allocated/freed by libavcodec.
2087 uint16_t *intra_matrix;
2090 * custom inter quantization matrix
2091 * Must be allocated with the av_malloc() family of functions, and will be freed in
2092 * avcodec_free_context().
2093 * - encoding: Set/allocated by user, freed by libavcodec. Can be NULL.
2094 * - decoding: Set/allocated/freed by libavcodec.
2096 uint16_t *inter_matrix;
2098 #if FF_API_PRIVATE_OPT
2099 /** @deprecated use encoder private options instead */
2100 attribute_deprecated
2101 int scenechange_threshold;
2103 /** @deprecated use encoder private options instead */
2104 attribute_deprecated
2105 int noise_reduction;
2109 * precision of the intra DC coefficient - 8
2110 * - encoding: Set by user.
2111 * - decoding: Set by libavcodec
2113 int intra_dc_precision;
2116 * Number of macroblock rows at the top which are skipped.
2117 * - encoding: unused
2118 * - decoding: Set by user.
2123 * Number of macroblock rows at the bottom which are skipped.
2124 * - encoding: unused
2125 * - decoding: Set by user.
2130 * minimum MB Lagrange multiplier
2131 * - encoding: Set by user.
2132 * - decoding: unused
2137 * maximum MB Lagrange multiplier
2138 * - encoding: Set by user.
2139 * - decoding: unused
2143 #if FF_API_PRIVATE_OPT
2145 * @deprecated use encoder private options instead
2147 attribute_deprecated
2148 int me_penalty_compensation;
2152 * - encoding: Set by user.
2153 * - decoding: unused
2157 #if FF_API_PRIVATE_OPT
2158 /** @deprecated use encoder private options instead */
2159 attribute_deprecated
2165 * - encoding: Set by user.
2166 * - decoding: unused
2171 * number of reference frames
2172 * - encoding: Set by user.
2173 * - decoding: Set by lavc.
2177 #if FF_API_PRIVATE_OPT
2178 /** @deprecated use encoder private options instead */
2179 attribute_deprecated
2184 * Note: Value depends upon the compare function used for fullpel ME.
2185 * - encoding: Set by user.
2186 * - decoding: unused
2190 #if FF_API_PRIVATE_OPT
2191 /** @deprecated use encoder private options instead */
2192 attribute_deprecated
2197 * Chromaticity coordinates of the source primaries.
2198 * - encoding: Set by user
2199 * - decoding: Set by libavcodec
2201 enum AVColorPrimaries color_primaries;
2204 * Color Transfer Characteristic.
2205 * - encoding: Set by user
2206 * - decoding: Set by libavcodec
2208 enum AVColorTransferCharacteristic color_trc;
2211 * YUV colorspace type.
2212 * - encoding: Set by user
2213 * - decoding: Set by libavcodec
2215 enum AVColorSpace colorspace;
2218 * MPEG vs JPEG YUV range.
2219 * - encoding: Set by user
2220 * - decoding: Set by libavcodec
2222 enum AVColorRange color_range;
2225 * This defines the location of chroma samples.
2226 * - encoding: Set by user
2227 * - decoding: Set by libavcodec
2229 enum AVChromaLocation chroma_sample_location;
2233 * Indicates number of picture subdivisions. Used for parallelized
2235 * - encoding: Set by user
2236 * - decoding: unused
2241 * - encoding: set by libavcodec
2242 * - decoding: Set by user.
2244 enum AVFieldOrder field_order;
2247 int sample_rate; ///< samples per second
2248 int channels; ///< number of audio channels
2251 * audio sample format
2252 * - encoding: Set by user.
2253 * - decoding: Set by libavcodec.
2255 enum AVSampleFormat sample_fmt; ///< sample format
2257 /* The following data should not be initialized. */
2259 * Number of samples per channel in an audio frame.
2261 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
2262 * except the last must contain exactly frame_size samples per channel.
2263 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
2264 * frame size is not restricted.
2265 * - decoding: may be set by some decoders to indicate constant frame size
2270 * Frame counter, set by libavcodec.
2272 * - decoding: total number of frames returned from the decoder so far.
2273 * - encoding: total number of frames passed to the encoder so far.
2275 * @note the counter is not incremented if encoding/decoding resulted in
2281 * number of bytes per packet if constant and known or 0
2282 * Used by some WAV based audio codecs.
2287 * Audio cutoff bandwidth (0 means "automatic")
2288 * - encoding: Set by user.
2289 * - decoding: unused
2294 * Audio channel layout.
2295 * - encoding: set by user.
2296 * - decoding: set by user, may be overwritten by libavcodec.
2298 uint64_t channel_layout;
2301 * Request decoder to use this channel layout if it can (0 for default)
2302 * - encoding: unused
2303 * - decoding: Set by user.
2305 uint64_t request_channel_layout;
2308 * Type of service that the audio stream conveys.
2309 * - encoding: Set by user.
2310 * - decoding: Set by libavcodec.
2312 enum AVAudioServiceType audio_service_type;
2315 * desired sample format
2316 * - encoding: Not used.
2317 * - decoding: Set by user.
2318 * Decoder will decode to this format if it can.
2320 enum AVSampleFormat request_sample_fmt;
2323 * This callback is called at the beginning of each frame to get data
2324 * buffer(s) for it. There may be one contiguous buffer for all the data or
2325 * there may be a buffer per each data plane or anything in between. What
2326 * this means is, you may set however many entries in buf[] you feel necessary.
2327 * Each buffer must be reference-counted using the AVBuffer API (see description
2330 * The following fields will be set in the frame before this callback is
2333 * - width, height (video only)
2334 * - sample_rate, channel_layout, nb_samples (audio only)
2335 * Their values may differ from the corresponding values in
2336 * AVCodecContext. This callback must use the frame values, not the codec
2337 * context values, to calculate the required buffer size.
2339 * This callback must fill the following fields in the frame:
2343 * * if the data is planar audio with more than 8 channels, then this
2344 * callback must allocate and fill extended_data to contain all pointers
2345 * to all data planes. data[] must hold as many pointers as it can.
2346 * extended_data must be allocated with av_malloc() and will be freed in
2348 * * otherwise extended_data must point to data
2349 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
2350 * the frame's data and extended_data pointers must be contained in these. That
2351 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
2352 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
2353 * and av_buffer_ref().
2354 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
2355 * this callback and filled with the extra buffers if there are more
2356 * buffers than buf[] can hold. extended_buf will be freed in
2359 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
2360 * avcodec_default_get_buffer2() instead of providing buffers allocated by
2363 * Each data plane must be aligned to the maximum required by the target
2366 * @see avcodec_default_get_buffer2()
2370 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
2371 * (read and/or written to if it is writable) later by libavcodec.
2373 * avcodec_align_dimensions2() should be used to find the required width and
2374 * height, as they normally need to be rounded up to the next multiple of 16.
2376 * Some decoders do not support linesizes changing between frames.
2378 * If frame multithreading is used and thread_safe_callbacks is set,
2379 * this callback may be called from a different thread, but not from more
2380 * than one at once. Does not need to be reentrant.
2382 * @see avcodec_align_dimensions2()
2386 * Decoders request a buffer of a particular size by setting
2387 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
2388 * however, utilize only part of the buffer by setting AVFrame.nb_samples
2389 * to a smaller value in the output frame.
2391 * As a convenience, av_samples_get_buffer_size() and
2392 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
2393 * functions to find the required data size and to fill data pointers and
2394 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
2395 * since all planes must be the same size.
2397 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
2399 * - encoding: unused
2400 * - decoding: Set by libavcodec, user can override.
2402 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
2405 * If non-zero, the decoded audio and video frames returned from
2406 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
2407 * and are valid indefinitely. The caller must free them with
2408 * av_frame_unref() when they are not needed anymore.
2409 * Otherwise, the decoded frames must not be freed by the caller and are
2410 * only valid until the next decode call.
2412 * This is always automatically enabled if avcodec_receive_frame() is used.
2414 * - encoding: unused
2415 * - decoding: set by the caller before avcodec_open2().
2417 attribute_deprecated
2418 int refcounted_frames;
2420 /* - encoding parameters */
2421 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2422 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2426 * - encoding: Set by user.
2427 * - decoding: unused
2433 * - encoding: Set by user.
2434 * - decoding: unused
2439 * maximum quantizer difference between frames
2440 * - encoding: Set by user.
2441 * - decoding: unused
2446 * decoder bitstream buffer size
2447 * - encoding: Set by user.
2448 * - decoding: unused
2453 * ratecontrol override, see RcOverride
2454 * - encoding: Allocated/set/freed by user.
2455 * - decoding: unused
2457 int rc_override_count;
2458 RcOverride *rc_override;
2462 * - encoding: Set by user.
2463 * - decoding: Set by user, may be overwritten by libavcodec.
2465 int64_t rc_max_rate;
2469 * - encoding: Set by user.
2470 * - decoding: unused
2472 int64_t rc_min_rate;
2475 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2476 * - encoding: Set by user.
2477 * - decoding: unused.
2479 float rc_max_available_vbv_use;
2482 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2483 * - encoding: Set by user.
2484 * - decoding: unused.
2486 float rc_min_vbv_overflow_use;
2489 * Number of bits which should be loaded into the rc buffer before decoding starts.
2490 * - encoding: Set by user.
2491 * - decoding: unused
2493 int rc_initial_buffer_occupancy;
2495 #if FF_API_CODER_TYPE
2496 #define FF_CODER_TYPE_VLC 0
2497 #define FF_CODER_TYPE_AC 1
2498 #define FF_CODER_TYPE_RAW 2
2499 #define FF_CODER_TYPE_RLE 3
2501 * @deprecated use encoder private options instead
2503 attribute_deprecated
2505 #endif /* FF_API_CODER_TYPE */
2507 #if FF_API_PRIVATE_OPT
2508 /** @deprecated use encoder private options instead */
2509 attribute_deprecated
2513 #if FF_API_PRIVATE_OPT
2514 /** @deprecated use encoder private options instead */
2515 attribute_deprecated
2516 int frame_skip_threshold;
2518 /** @deprecated use encoder private options instead */
2519 attribute_deprecated
2520 int frame_skip_factor;
2522 /** @deprecated use encoder private options instead */
2523 attribute_deprecated
2526 /** @deprecated use encoder private options instead */
2527 attribute_deprecated
2529 #endif /* FF_API_PRIVATE_OPT */
2532 * trellis RD quantization
2533 * - encoding: Set by user.
2534 * - decoding: unused
2538 #if FF_API_PRIVATE_OPT
2539 /** @deprecated use encoder private options instead */
2540 attribute_deprecated
2541 int min_prediction_order;
2543 /** @deprecated use encoder private options instead */
2544 attribute_deprecated
2545 int max_prediction_order;
2547 /** @deprecated use encoder private options instead */
2548 attribute_deprecated
2549 int64_t timecode_frame_start;
2552 #if FF_API_RTP_CALLBACK
2554 * @deprecated unused
2556 /* The RTP callback: This function is called */
2557 /* every time the encoder has a packet to send. */
2558 /* It depends on the encoder if the data starts */
2559 /* with a Start Code (it should). H.263 does. */
2560 /* mb_nb contains the number of macroblocks */
2561 /* encoded in the RTP payload. */
2562 attribute_deprecated
2563 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2566 #if FF_API_PRIVATE_OPT
2567 /** @deprecated use encoder private options instead */
2568 attribute_deprecated
2569 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2570 /* do its best to deliver a chunk with size */
2571 /* below rtp_payload_size, the chunk will start */
2572 /* with a start code on some codecs like H.263. */
2573 /* This doesn't take account of any particular */
2574 /* headers inside the transmitted RTP payload. */
2577 #if FF_API_STAT_BITS
2578 /* statistics, used for 2-pass encoding */
2579 attribute_deprecated
2581 attribute_deprecated
2583 attribute_deprecated
2585 attribute_deprecated
2587 attribute_deprecated
2589 attribute_deprecated
2591 attribute_deprecated
2593 attribute_deprecated
2596 /** @deprecated this field is unused */
2597 attribute_deprecated
2602 * pass1 encoding statistics output buffer
2603 * - encoding: Set by libavcodec.
2604 * - decoding: unused
2609 * pass2 encoding statistics input buffer
2610 * Concatenated stuff from stats_out of pass1 should be placed here.
2611 * - encoding: Allocated/set/freed by user.
2612 * - decoding: unused
2617 * Work around bugs in encoders which sometimes cannot be detected automatically.
2618 * - encoding: Set by user
2619 * - decoding: Set by user
2621 int workaround_bugs;
2622 #define FF_BUG_AUTODETECT 1 ///< autodetection
2623 #define FF_BUG_XVID_ILACE 4
2624 #define FF_BUG_UMP4 8
2625 #define FF_BUG_NO_PADDING 16
2626 #define FF_BUG_AMV 32
2627 #define FF_BUG_QPEL_CHROMA 64
2628 #define FF_BUG_STD_QPEL 128
2629 #define FF_BUG_QPEL_CHROMA2 256
2630 #define FF_BUG_DIRECT_BLOCKSIZE 512
2631 #define FF_BUG_EDGE 1024
2632 #define FF_BUG_HPEL_CHROMA 2048
2633 #define FF_BUG_DC_CLIP 4096
2634 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2635 #define FF_BUG_TRUNCATED 16384
2636 #define FF_BUG_IEDGE 32768
2639 * strictly follow the standard (MPEG-4, ...).
2640 * - encoding: Set by user.
2641 * - decoding: Set by user.
2642 * Setting this to STRICT or higher means the encoder and decoder will
2643 * generally do stupid things, whereas setting it to unofficial or lower
2644 * will mean the encoder might produce output that is not supported by all
2645 * spec-compliant decoders. Decoders don't differentiate between normal,
2646 * unofficial and experimental (that is, they always try to decode things
2647 * when they can) unless they are explicitly asked to behave stupidly
2648 * (=strictly conform to the specs)
2650 int strict_std_compliance;
2651 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2652 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2653 #define FF_COMPLIANCE_NORMAL 0
2654 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2655 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2658 * error concealment flags
2659 * - encoding: unused
2660 * - decoding: Set by user.
2662 int error_concealment;
2663 #define FF_EC_GUESS_MVS 1
2664 #define FF_EC_DEBLOCK 2
2665 #define FF_EC_FAVOR_INTER 256
2669 * - encoding: Set by user.
2670 * - decoding: Set by user.
2673 #define FF_DEBUG_PICT_INFO 1
2674 #define FF_DEBUG_RC 2
2675 #define FF_DEBUG_BITSTREAM 4
2676 #define FF_DEBUG_MB_TYPE 8
2677 #define FF_DEBUG_QP 16
2680 * @deprecated this option does nothing
2682 #define FF_DEBUG_MV 32
2684 #define FF_DEBUG_DCT_COEFF 0x00000040
2685 #define FF_DEBUG_SKIP 0x00000080
2686 #define FF_DEBUG_STARTCODE 0x00000100
2687 #define FF_DEBUG_ER 0x00000400
2688 #define FF_DEBUG_MMCO 0x00000800
2689 #define FF_DEBUG_BUGS 0x00001000
2691 #define FF_DEBUG_VIS_QP 0x00002000
2692 #define FF_DEBUG_VIS_MB_TYPE 0x00004000
2694 #define FF_DEBUG_BUFFERS 0x00008000
2695 #define FF_DEBUG_THREADS 0x00010000
2696 #define FF_DEBUG_GREEN_MD 0x00800000
2697 #define FF_DEBUG_NOMC 0x01000000
2702 * - encoding: Set by user.
2703 * - decoding: Set by user.
2706 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 // visualize forward predicted MVs of P-frames
2707 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 // visualize forward predicted MVs of B-frames
2708 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 // visualize backward predicted MVs of B-frames
2712 * Error recognition; may misdetect some more or less valid parts as errors.
2713 * - encoding: unused
2714 * - decoding: Set by user.
2716 int err_recognition;
2719 * Verify checksums embedded in the bitstream (could be of either encoded or
2720 * decoded data, depending on the codec) and print an error message on mismatch.
2721 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2722 * decoder returning an error.
2724 #define AV_EF_CRCCHECK (1<<0)
2725 #define AV_EF_BITSTREAM (1<<1) ///< detect bitstream specification deviations
2726 #define AV_EF_BUFFER (1<<2) ///< detect improper bitstream length
2727 #define AV_EF_EXPLODE (1<<3) ///< abort decoding on minor error detection
2729 #define AV_EF_IGNORE_ERR (1<<15) ///< ignore errors and continue
2730 #define AV_EF_CAREFUL (1<<16) ///< consider things that violate the spec, are fast to calculate and have not been seen in the wild as errors
2731 #define AV_EF_COMPLIANT (1<<17) ///< consider all spec non compliances as errors
2732 #define AV_EF_AGGRESSIVE (1<<18) ///< consider things that a sane encoder should not do as an error
2736 * opaque 64-bit number (generally a PTS) that will be reordered and
2737 * output in AVFrame.reordered_opaque
2738 * - encoding: Set by libavcodec to the reordered_opaque of the input
2739 * frame corresponding to the last returned packet. Only
2740 * supported by encoders with the
2741 * AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability.
2742 * - decoding: Set by user.
2744 int64_t reordered_opaque;
2747 * Hardware accelerator in use
2748 * - encoding: unused.
2749 * - decoding: Set by libavcodec
2751 const struct AVHWAccel *hwaccel;
2754 * Hardware accelerator context.
2755 * For some hardware accelerators, a global context needs to be
2756 * provided by the user. In that case, this holds display-dependent
2757 * data FFmpeg cannot instantiate itself. Please refer to the
2758 * FFmpeg HW accelerator documentation to know how to fill this
2759 * is. e.g. for VA API, this is a struct vaapi_context.
2760 * - encoding: unused
2761 * - decoding: Set by user
2763 void *hwaccel_context;
2767 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2768 * - decoding: unused
2770 uint64_t error[AV_NUM_DATA_POINTERS];
2773 * DCT algorithm, see FF_DCT_* below
2774 * - encoding: Set by user.
2775 * - decoding: unused
2778 #define FF_DCT_AUTO 0
2779 #define FF_DCT_FASTINT 1
2780 #define FF_DCT_INT 2
2781 #define FF_DCT_MMX 3
2782 #define FF_DCT_ALTIVEC 5
2783 #define FF_DCT_FAAN 6
2786 * IDCT algorithm, see FF_IDCT_* below.
2787 * - encoding: Set by user.
2788 * - decoding: Set by user.
2791 #define FF_IDCT_AUTO 0
2792 #define FF_IDCT_INT 1
2793 #define FF_IDCT_SIMPLE 2
2794 #define FF_IDCT_SIMPLEMMX 3
2795 #define FF_IDCT_ARM 7
2796 #define FF_IDCT_ALTIVEC 8
2797 #define FF_IDCT_SIMPLEARM 10
2798 #define FF_IDCT_XVID 14
2799 #define FF_IDCT_SIMPLEARMV5TE 16
2800 #define FF_IDCT_SIMPLEARMV6 17
2801 #define FF_IDCT_FAAN 20
2802 #define FF_IDCT_SIMPLENEON 22
2803 #define FF_IDCT_NONE 24 /* Used by XvMC to extract IDCT coefficients with FF_IDCT_PERM_NONE */
2804 #define FF_IDCT_SIMPLEAUTO 128
2807 * bits per sample/pixel from the demuxer (needed for huffyuv).
2808 * - encoding: Set by libavcodec.
2809 * - decoding: Set by user.
2811 int bits_per_coded_sample;
2814 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2815 * - encoding: set by user.
2816 * - decoding: set by libavcodec.
2818 int bits_per_raw_sample;
2822 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
2823 * - encoding: unused
2824 * - decoding: Set by user.
2829 #if FF_API_CODED_FRAME
2831 * the picture in the bitstream
2832 * - encoding: Set by libavcodec.
2833 * - decoding: unused
2835 * @deprecated use the quality factor packet side data instead
2837 attribute_deprecated AVFrame *coded_frame;
2842 * is used to decide how many independent tasks should be passed to execute()
2843 * - encoding: Set by user.
2844 * - decoding: Set by user.
2849 * Which multithreading methods to use.
2850 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2851 * so clients which cannot provide future frames should not use it.
2853 * - encoding: Set by user, otherwise the default is used.
2854 * - decoding: Set by user, otherwise the default is used.
2857 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2858 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2861 * Which multithreading methods are in use by the codec.
2862 * - encoding: Set by libavcodec.
2863 * - decoding: Set by libavcodec.
2865 int active_thread_type;
2868 * Set by the client if its custom get_buffer() callback can be called
2869 * synchronously from another thread, which allows faster multithreaded decoding.
2870 * draw_horiz_band() will be called from other threads regardless of this setting.
2871 * Ignored if the default get_buffer() is used.
2872 * - encoding: Set by user.
2873 * - decoding: Set by user.
2875 int thread_safe_callbacks;
2878 * The codec may call this to execute several independent things.
2879 * It will return only after finishing all tasks.
2880 * The user may replace this with some multithreaded implementation,
2881 * the default implementation will execute the parts serially.
2882 * @param count the number of things to execute
2883 * - encoding: Set by libavcodec, user can override.
2884 * - decoding: Set by libavcodec, user can override.
2886 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2889 * The codec may call this to execute several independent things.
2890 * It will return only after finishing all tasks.
2891 * The user may replace this with some multithreaded implementation,
2892 * the default implementation will execute the parts serially.
2893 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2894 * @param c context passed also to func
2895 * @param count the number of things to execute
2896 * @param arg2 argument passed unchanged to func
2897 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2898 * @param func function that will be called count times, with jobnr from 0 to count-1.
2899 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2900 * two instances of func executing at the same time will have the same threadnr.
2901 * @return always 0 currently, but code should handle a future improvement where when any call to func
2902 * returns < 0 no further calls to func may be done and < 0 is returned.
2903 * - encoding: Set by libavcodec, user can override.
2904 * - decoding: Set by libavcodec, user can override.
2906 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2909 * noise vs. sse weight for the nsse comparison function
2910 * - encoding: Set by user.
2911 * - decoding: unused
2917 * - encoding: Set by user.
2918 * - decoding: Set by libavcodec.
2921 #define FF_PROFILE_UNKNOWN -99
2922 #define FF_PROFILE_RESERVED -100
2924 #define FF_PROFILE_AAC_MAIN 0
2925 #define FF_PROFILE_AAC_LOW 1
2926 #define FF_PROFILE_AAC_SSR 2
2927 #define FF_PROFILE_AAC_LTP 3
2928 #define FF_PROFILE_AAC_HE 4
2929 #define FF_PROFILE_AAC_HE_V2 28
2930 #define FF_PROFILE_AAC_LD 22
2931 #define FF_PROFILE_AAC_ELD 38
2932 #define FF_PROFILE_MPEG2_AAC_LOW 128
2933 #define FF_PROFILE_MPEG2_AAC_HE 131
2935 #define FF_PROFILE_DNXHD 0
2936 #define FF_PROFILE_DNXHR_LB 1
2937 #define FF_PROFILE_DNXHR_SQ 2
2938 #define FF_PROFILE_DNXHR_HQ 3
2939 #define FF_PROFILE_DNXHR_HQX 4
2940 #define FF_PROFILE_DNXHR_444 5
2942 #define FF_PROFILE_DTS 20
2943 #define FF_PROFILE_DTS_ES 30
2944 #define FF_PROFILE_DTS_96_24 40
2945 #define FF_PROFILE_DTS_HD_HRA 50
2946 #define FF_PROFILE_DTS_HD_MA 60
2947 #define FF_PROFILE_DTS_EXPRESS 70
2949 #define FF_PROFILE_MPEG2_422 0
2950 #define FF_PROFILE_MPEG2_HIGH 1
2951 #define FF_PROFILE_MPEG2_SS 2
2952 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2953 #define FF_PROFILE_MPEG2_MAIN 4
2954 #define FF_PROFILE_MPEG2_SIMPLE 5
2956 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2957 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2959 #define FF_PROFILE_H264_BASELINE 66
2960 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2961 #define FF_PROFILE_H264_MAIN 77
2962 #define FF_PROFILE_H264_EXTENDED 88
2963 #define FF_PROFILE_H264_HIGH 100
2964 #define FF_PROFILE_H264_HIGH_10 110
2965 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2966 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
2967 #define FF_PROFILE_H264_HIGH_422 122
2968 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2969 #define FF_PROFILE_H264_STEREO_HIGH 128
2970 #define FF_PROFILE_H264_HIGH_444 144
2971 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2972 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2973 #define FF_PROFILE_H264_CAVLC_444 44
2975 #define FF_PROFILE_VC1_SIMPLE 0
2976 #define FF_PROFILE_VC1_MAIN 1
2977 #define FF_PROFILE_VC1_COMPLEX 2
2978 #define FF_PROFILE_VC1_ADVANCED 3
2980 #define FF_PROFILE_MPEG4_SIMPLE 0
2981 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2982 #define FF_PROFILE_MPEG4_CORE 2
2983 #define FF_PROFILE_MPEG4_MAIN 3
2984 #define FF_PROFILE_MPEG4_N_BIT 4
2985 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2986 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2987 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2988 #define FF_PROFILE_MPEG4_HYBRID 8
2989 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2990 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2991 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2992 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2993 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2994 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2995 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2997 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
2998 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
2999 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
3000 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
3001 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
3003 #define FF_PROFILE_VP9_0 0
3004 #define FF_PROFILE_VP9_1 1
3005 #define FF_PROFILE_VP9_2 2
3006 #define FF_PROFILE_VP9_3 3
3008 #define FF_PROFILE_HEVC_MAIN 1
3009 #define FF_PROFILE_HEVC_MAIN_10 2
3010 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
3011 #define FF_PROFILE_HEVC_REXT 4
3013 #define FF_PROFILE_AV1_MAIN 0
3014 #define FF_PROFILE_AV1_HIGH 1
3015 #define FF_PROFILE_AV1_PROFESSIONAL 2
3017 #define FF_PROFILE_MJPEG_HUFFMAN_BASELINE_DCT 0xc0
3018 #define FF_PROFILE_MJPEG_HUFFMAN_EXTENDED_SEQUENTIAL_DCT 0xc1
3019 #define FF_PROFILE_MJPEG_HUFFMAN_PROGRESSIVE_DCT 0xc2
3020 #define FF_PROFILE_MJPEG_HUFFMAN_LOSSLESS 0xc3
3021 #define FF_PROFILE_MJPEG_JPEG_LS 0xf7
3023 #define FF_PROFILE_SBC_MSBC 1
3025 #define FF_PROFILE_PRORES_PROXY 0
3026 #define FF_PROFILE_PRORES_LT 1
3027 #define FF_PROFILE_PRORES_STANDARD 2
3028 #define FF_PROFILE_PRORES_HQ 3
3029 #define FF_PROFILE_PRORES_4444 4
3030 #define FF_PROFILE_PRORES_XQ 5
3032 #define FF_PROFILE_ARIB_PROFILE_A 0
3033 #define FF_PROFILE_ARIB_PROFILE_C 1
3037 * - encoding: Set by user.
3038 * - decoding: Set by libavcodec.
3041 #define FF_LEVEL_UNKNOWN -99
3044 * Skip loop filtering for selected frames.
3045 * - encoding: unused
3046 * - decoding: Set by user.
3048 enum AVDiscard skip_loop_filter;
3051 * Skip IDCT/dequantization for selected frames.
3052 * - encoding: unused
3053 * - decoding: Set by user.
3055 enum AVDiscard skip_idct;
3058 * Skip decoding for selected frames.
3059 * - encoding: unused
3060 * - decoding: Set by user.
3062 enum AVDiscard skip_frame;
3065 * Header containing style information for text subtitles.
3066 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
3067 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
3068 * the Format line following. It shouldn't include any Dialogue line.
3069 * - encoding: Set/allocated/freed by user (before avcodec_open2())
3070 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
3072 uint8_t *subtitle_header;
3073 int subtitle_header_size;
3075 #if FF_API_VBV_DELAY
3077 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
3078 * Used for compliant TS muxing.
3079 * - encoding: Set by libavcodec.
3080 * - decoding: unused.
3081 * @deprecated this value is now exported as a part of
3082 * AV_PKT_DATA_CPB_PROPERTIES packet side data
3084 attribute_deprecated
3088 #if FF_API_SIDEDATA_ONLY_PKT
3090 * Encoding only and set by default. Allow encoders to output packets
3091 * that do not contain any encoded data, only side data.
3093 * Some encoders need to output such packets, e.g. to update some stream
3094 * parameters at the end of encoding.
3096 * @deprecated this field disables the default behaviour and
3097 * it is kept only for compatibility.
3099 attribute_deprecated
3100 int side_data_only_packets;
3104 * Audio only. The number of "priming" samples (padding) inserted by the
3105 * encoder at the beginning of the audio. I.e. this number of leading
3106 * decoded samples must be discarded by the caller to get the original audio
3107 * without leading padding.
3109 * - decoding: unused
3110 * - encoding: Set by libavcodec. The timestamps on the output packets are
3111 * adjusted by the encoder so that they always refer to the
3112 * first sample of the data actually contained in the packet,
3113 * including any added padding. E.g. if the timebase is
3114 * 1/samplerate and the timestamp of the first input sample is
3115 * 0, the timestamp of the first output packet will be
3118 int initial_padding;
3121 * - decoding: For codecs that store a framerate value in the compressed
3122 * bitstream, the decoder may export it here. { 0, 1} when
3124 * - encoding: May be used to signal the framerate of CFR content to an
3127 AVRational framerate;
3130 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
3131 * - encoding: unused.
3132 * - decoding: Set by libavcodec before calling get_format()
3134 enum AVPixelFormat sw_pix_fmt;
3137 * Timebase in which pkt_dts/pts and AVPacket.dts/pts are.
3138 * - encoding unused.
3139 * - decoding set by user.
3141 AVRational pkt_timebase;
3145 * - encoding: unused.
3146 * - decoding: set by libavcodec.
3148 const AVCodecDescriptor *codec_descriptor;
3152 * low resolution decoding, 1-> 1/2 size, 2->1/4 size
3153 * - encoding: unused
3154 * - decoding: Set by user.
3160 * Current statistics for PTS correction.
3161 * - decoding: maintained and used by libavcodec, not intended to be used by user apps
3162 * - encoding: unused
3164 int64_t pts_correction_num_faulty_pts; /// Number of incorrect PTS values so far
3165 int64_t pts_correction_num_faulty_dts; /// Number of incorrect DTS values so far
3166 int64_t pts_correction_last_pts; /// PTS of the last frame
3167 int64_t pts_correction_last_dts; /// DTS of the last frame
3170 * Character encoding of the input subtitles file.
3171 * - decoding: set by user
3172 * - encoding: unused
3177 * Subtitles character encoding mode. Formats or codecs might be adjusting
3178 * this setting (if they are doing the conversion themselves for instance).
3179 * - decoding: set by libavcodec
3180 * - encoding: unused
3182 int sub_charenc_mode;
3183 #define FF_SUB_CHARENC_MODE_DO_NOTHING -1 ///< do nothing (demuxer outputs a stream supposed to be already in UTF-8, or the codec is bitmap for instance)
3184 #define FF_SUB_CHARENC_MODE_AUTOMATIC 0 ///< libavcodec will select the mode itself
3185 #define FF_SUB_CHARENC_MODE_PRE_DECODER 1 ///< the AVPacket data needs to be recoded to UTF-8 before being fed to the decoder, requires iconv
3186 #define FF_SUB_CHARENC_MODE_IGNORE 2 ///< neither convert the subtitles, nor check them for valid UTF-8
3189 * Skip processing alpha if supported by codec.
3190 * Note that if the format uses pre-multiplied alpha (common with VP6,
3191 * and recommended due to better video quality/compression)
3192 * the image will look as if alpha-blended onto a black background.
3193 * However for formats that do not use pre-multiplied alpha
3194 * there might be serious artefacts (though e.g. libswscale currently
3195 * assumes pre-multiplied alpha anyway).
3197 * - decoding: set by user
3198 * - encoding: unused
3203 * Number of samples to skip after a discontinuity
3204 * - decoding: unused
3205 * - encoding: set by libavcodec
3209 #if !FF_API_DEBUG_MV
3211 * debug motion vectors
3212 * - encoding: Set by user.
3213 * - decoding: Set by user.
3216 #define FF_DEBUG_VIS_MV_P_FOR 0x00000001 //visualize forward predicted MVs of P frames
3217 #define FF_DEBUG_VIS_MV_B_FOR 0x00000002 //visualize forward predicted MVs of B frames
3218 #define FF_DEBUG_VIS_MV_B_BACK 0x00000004 //visualize backward predicted MVs of B frames
3222 * custom intra quantization matrix
3223 * - encoding: Set by user, can be NULL.
3224 * - decoding: unused.
3226 uint16_t *chroma_intra_matrix;
3229 * dump format separator.
3230 * can be ", " or "\n " or anything else
3231 * - encoding: Set by user.
3232 * - decoding: Set by user.
3234 uint8_t *dump_separator;
3237 * ',' separated list of allowed decoders.
3238 * If NULL then all are allowed
3239 * - encoding: unused
3240 * - decoding: set by user
3242 char *codec_whitelist;
3245 * Properties of the stream that gets decoded
3246 * - encoding: unused
3247 * - decoding: set by libavcodec
3249 unsigned properties;
3250 #define FF_CODEC_PROPERTY_LOSSLESS 0x00000001
3251 #define FF_CODEC_PROPERTY_CLOSED_CAPTIONS 0x00000002
3254 * Additional data associated with the entire coded stream.
3256 * - decoding: unused
3257 * - encoding: may be set by libavcodec after avcodec_open2().
3259 AVPacketSideData *coded_side_data;
3260 int nb_coded_side_data;
3263 * A reference to the AVHWFramesContext describing the input (for encoding)
3264 * or output (decoding) frames. The reference is set by the caller and
3265 * afterwards owned (and freed) by libavcodec - it should never be read by
3266 * the caller after being set.
3268 * - decoding: This field should be set by the caller from the get_format()
3269 * callback. The previous reference (if any) will always be
3270 * unreffed by libavcodec before the get_format() call.
3272 * If the default get_buffer2() is used with a hwaccel pixel
3273 * format, then this AVHWFramesContext will be used for
3274 * allocating the frame buffers.
3276 * - encoding: For hardware encoders configured to use a hwaccel pixel
3277 * format, this field should be set by the caller to a reference
3278 * to the AVHWFramesContext describing input frames.
3279 * AVHWFramesContext.format must be equal to
3280 * AVCodecContext.pix_fmt.
3282 * This field should be set before avcodec_open2() is called.
3284 AVBufferRef *hw_frames_ctx;
3287 * Control the form of AVSubtitle.rects[N]->ass
3288 * - decoding: set by user
3289 * - encoding: unused
3291 int sub_text_format;
3292 #define FF_SUB_TEXT_FMT_ASS 0
3293 #if FF_API_ASS_TIMING
3294 #define FF_SUB_TEXT_FMT_ASS_WITH_TIMINGS 1
3298 * Audio only. The amount of padding (in samples) appended by the encoder to
3299 * the end of the audio. I.e. this number of decoded samples must be
3300 * discarded by the caller from the end of the stream to get the original
3301 * audio without any trailing padding.
3303 * - decoding: unused
3304 * - encoding: unused
3306 int trailing_padding;
3309 * The number of pixels per image to maximally accept.
3311 * - decoding: set by user
3312 * - encoding: set by user
3317 * A reference to the AVHWDeviceContext describing the device which will
3318 * be used by a hardware encoder/decoder. The reference is set by the
3319 * caller and afterwards owned (and freed) by libavcodec.
3321 * This should be used if either the codec device does not require
3322 * hardware frames or any that are used are to be allocated internally by
3323 * libavcodec. If the user wishes to supply any of the frames used as
3324 * encoder input or decoder output then hw_frames_ctx should be used
3325 * instead. When hw_frames_ctx is set in get_format() for a decoder, this
3326 * field will be ignored while decoding the associated stream segment, but
3327 * may again be used on a following one after another get_format() call.
3329 * For both encoders and decoders this field should be set before
3330 * avcodec_open2() is called and must not be written to thereafter.
3332 * Note that some decoders may require this field to be set initially in
3333 * order to support hw_frames_ctx at all - in that case, all frames
3334 * contexts used must be created on the same device.
3336 AVBufferRef *hw_device_ctx;
3339 * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
3340 * decoding (if active).
3341 * - encoding: unused
3342 * - decoding: Set by user (either before avcodec_open2(), or in the
3343 * AVCodecContext.get_format callback)
3348 * Video decoding only. Certain video codecs support cropping, meaning that
3349 * only a sub-rectangle of the decoded frame is intended for display. This
3350 * option controls how cropping is handled by libavcodec.
3352 * When set to 1 (the default), libavcodec will apply cropping internally.
3353 * I.e. it will modify the output frame width/height fields and offset the
3354 * data pointers (only by as much as possible while preserving alignment, or
3355 * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
3356 * the frames output by the decoder refer only to the cropped area. The
3357 * crop_* fields of the output frames will be zero.
3359 * When set to 0, the width/height fields of the output frames will be set
3360 * to the coded dimensions and the crop_* fields will describe the cropping
3361 * rectangle. Applying the cropping is left to the caller.
3363 * @warning When hardware acceleration with opaque output frames is used,
3364 * libavcodec is unable to apply cropping from the top/left border.
3366 * @note when this option is set to zero, the width/height fields of the
3367 * AVCodecContext and output AVFrames have different meanings. The codec
3368 * context fields store display dimensions (with the coded dimensions in
3369 * coded_width/height), while the frame fields store the coded dimensions
3370 * (with the display dimensions being determined by the crop_* fields).
3375 * Video decoding only. Sets the number of extra hardware frames which
3376 * the decoder will allocate for use by the caller. This must be set
3377 * before avcodec_open2() is called.
3379 * Some hardware decoders require all frames that they will use for
3380 * output to be defined in advance before decoding starts. For such
3381 * decoders, the hardware frame pool must therefore be of a fixed size.
3382 * The extra frames set here are on top of any number that the decoder
3383 * needs internally in order to operate normally (for example, frames
3384 * used as reference pictures).
3386 int extra_hw_frames;
3389 * The percentage of damaged samples to discard a frame.
3391 * - decoding: set by user
3392 * - encoding: unused
3394 int discard_damaged_percentage;
3397 * The number of samples per frame to maximally accept.
3399 * - decoding: set by user
3400 * - encoding: set by user
3402 int64_t max_samples;
3405 #if FF_API_CODEC_GET_SET
3407 * Accessors for some AVCodecContext fields. These used to be provided for ABI
3408 * compatibility, and do not need to be used anymore.
3410 attribute_deprecated
3411 AVRational av_codec_get_pkt_timebase (const AVCodecContext *avctx);
3412 attribute_deprecated
3413 void av_codec_set_pkt_timebase (AVCodecContext *avctx, AVRational val);
3415 attribute_deprecated
3416 const AVCodecDescriptor *av_codec_get_codec_descriptor(const AVCodecContext *avctx);
3417 attribute_deprecated
3418 void av_codec_set_codec_descriptor(AVCodecContext *avctx, const AVCodecDescriptor *desc);
3420 attribute_deprecated
3421 unsigned av_codec_get_codec_properties(const AVCodecContext *avctx);
3424 attribute_deprecated
3425 int av_codec_get_lowres(const AVCodecContext *avctx);
3426 attribute_deprecated
3427 void av_codec_set_lowres(AVCodecContext *avctx, int val);
3430 attribute_deprecated
3431 int av_codec_get_seek_preroll(const AVCodecContext *avctx);
3432 attribute_deprecated
3433 void av_codec_set_seek_preroll(AVCodecContext *avctx, int val);
3435 attribute_deprecated
3436 uint16_t *av_codec_get_chroma_intra_matrix(const AVCodecContext *avctx);
3437 attribute_deprecated
3438 void av_codec_set_chroma_intra_matrix(AVCodecContext *avctx, uint16_t *val);
3444 typedef struct AVProfile {
3446 const char *name; ///< short name for the profile
3451 * The codec supports this format via the hw_device_ctx interface.
3453 * When selecting this format, AVCodecContext.hw_device_ctx should
3454 * have been set to a device of the specified type before calling
3457 AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX = 0x01,
3459 * The codec supports this format via the hw_frames_ctx interface.
3461 * When selecting this format for a decoder,
3462 * AVCodecContext.hw_frames_ctx should be set to a suitable frames
3463 * context inside the get_format() callback. The frames context
3464 * must have been created on a device of the specified type.
3466 AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX = 0x02,
3468 * The codec supports this format by some internal method.
3470 * This format can be selected without any additional configuration -
3471 * no device or frames context is required.
3473 AV_CODEC_HW_CONFIG_METHOD_INTERNAL = 0x04,
3475 * The codec supports this format by some ad-hoc method.
3477 * Additional settings and/or function calls are required. See the
3478 * codec-specific documentation for details. (Methods requiring
3479 * this sort of configuration are deprecated and others should be
3480 * used in preference.)
3482 AV_CODEC_HW_CONFIG_METHOD_AD_HOC = 0x08,
3485 typedef struct AVCodecHWConfig {
3487 * A hardware pixel format which the codec can use.
3489 enum AVPixelFormat pix_fmt;
3491 * Bit set of AV_CODEC_HW_CONFIG_METHOD_* flags, describing the possible
3492 * setup methods which can be used with this configuration.
3496 * The device type associated with the configuration.
3498 * Must be set for AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX and
3499 * AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX, otherwise unused.
3501 enum AVHWDeviceType device_type;
3504 typedef struct AVCodecDefault AVCodecDefault;
3511 typedef struct AVCodec {
3513 * Name of the codec implementation.
3514 * The name is globally unique among encoders and among decoders (but an
3515 * encoder and a decoder can share the same name).
3516 * This is the primary way to find a codec from the user perspective.
3520 * Descriptive name for the codec, meant to be more human readable than name.
3521 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
3523 const char *long_name;
3524 enum AVMediaType type;
3527 * Codec capabilities.
3528 * see AV_CODEC_CAP_*
3531 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
3532 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
3533 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
3534 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
3535 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
3536 uint8_t max_lowres; ///< maximum value for lowres supported by the decoder
3537 const AVClass *priv_class; ///< AVClass for the private context
3538 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
3541 * Group name of the codec implementation.
3542 * This is a short symbolic name of the wrapper backing this codec. A
3543 * wrapper uses some kind of external implementation for the codec, such
3544 * as an external library, or a codec implementation provided by the OS or
3546 * If this field is NULL, this is a builtin, libavcodec native codec.
3547 * If non-NULL, this will be the suffix in AVCodec.name in most cases
3548 * (usually AVCodec.name will be of the form "<codec_name>_<wrapper_name>").
3550 const char *wrapper_name;
3552 /*****************************************************************
3553 * No fields below this line are part of the public API. They
3554 * may not be used outside of libavcodec and can be changed and
3556 * New public fields should be added right above.
3557 *****************************************************************
3560 struct AVCodec *next;
3562 * @name Frame-level threading support functions
3566 * If defined, called on thread contexts when they are created.
3567 * If the codec allocates writable tables in init(), re-allocate them here.
3568 * priv_data will be set to a copy of the original.
3570 int (*init_thread_copy)(AVCodecContext *);
3572 * Copy necessary context variables from a previous thread context to the current one.
3573 * If not defined, the next thread will start automatically; otherwise, the codec
3574 * must call ff_thread_finish_setup().
3576 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
3578 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
3582 * Private codec-specific defaults.
3584 const AVCodecDefault *defaults;
3587 * Initialize codec static data, called from avcodec_register().
3589 * This is not intended for time consuming operations as it is
3590 * run for every codec regardless of that codec being used.
3592 void (*init_static_data)(struct AVCodec *codec);
3594 int (*init)(AVCodecContext *);
3595 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
3596 const struct AVSubtitle *sub);
3598 * Encode data to an AVPacket.
3600 * @param avctx codec context
3601 * @param avpkt output AVPacket (may contain a user-provided buffer)
3602 * @param[in] frame AVFrame containing the raw data to be encoded
3603 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
3604 * non-empty packet was returned in avpkt.
3605 * @return 0 on success, negative error code on failure
3607 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
3608 int *got_packet_ptr);
3609 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
3610 int (*close)(AVCodecContext *);
3612 * Encode API with decoupled packet/frame dataflow. The API is the
3613 * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
3615 * - never called if the codec is closed or the wrong type,
3616 * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
3617 * - only one drain frame is ever passed down,
3619 int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
3620 int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
3623 * Decode API with decoupled packet/frame dataflow. This function is called
3624 * to get one output frame. It should call ff_decode_get_packet() to obtain
3627 int (*receive_frame)(AVCodecContext *avctx, AVFrame *frame);
3630 * Will be called when seeking
3632 void (*flush)(AVCodecContext *);
3634 * Internal codec capabilities.
3635 * See FF_CODEC_CAP_* in internal.h
3640 * Decoding only, a comma-separated list of bitstream filters to apply to
3641 * packets before decoding.
3646 * Array of pointers to hardware configurations supported by the codec,
3647 * or NULL if no hardware supported. The array is terminated by a NULL
3650 * The user can only access this field via avcodec_get_hw_config().
3652 const struct AVCodecHWConfigInternal **hw_configs;
3655 * List of supported codec_tags, terminated by FF_CODEC_TAGS_END.
3657 const uint32_t *codec_tags;
3660 #if FF_API_CODEC_GET_SET
3661 attribute_deprecated
3662 int av_codec_get_max_lowres(const AVCodec *codec);
3665 struct MpegEncContext;
3668 * Retrieve supported hardware configurations for a codec.
3670 * Values of index from zero to some maximum return the indexed configuration
3671 * descriptor; all other values return NULL. If the codec does not support
3672 * any hardware configurations then it will always return NULL.
3674 const AVCodecHWConfig *avcodec_get_hw_config(const AVCodec *codec, int index);
3677 * @defgroup lavc_hwaccel AVHWAccel
3679 * @note Nothing in this structure should be accessed by the user. At some
3680 * point in future it will not be externally visible at all.
3684 typedef struct AVHWAccel {
3686 * Name of the hardware accelerated codec.
3687 * The name is globally unique among encoders and among decoders (but an
3688 * encoder and a decoder can share the same name).
3693 * Type of codec implemented by the hardware accelerator.
3695 * See AVMEDIA_TYPE_xxx
3697 enum AVMediaType type;
3700 * Codec implemented by the hardware accelerator.
3702 * See AV_CODEC_ID_xxx
3707 * Supported pixel format.
3709 * Only hardware accelerated formats are supported here.
3711 enum AVPixelFormat pix_fmt;
3714 * Hardware accelerated codec capabilities.
3715 * see AV_HWACCEL_CODEC_CAP_*
3719 /*****************************************************************
3720 * No fields below this line are part of the public API. They
3721 * may not be used outside of libavcodec and can be changed and
3723 * New public fields should be added right above.
3724 *****************************************************************
3728 * Allocate a custom buffer
3730 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
3733 * Called at the beginning of each frame or field picture.
3735 * Meaningful frame information (codec specific) is guaranteed to
3736 * be parsed at this point. This function is mandatory.
3738 * Note that buf can be NULL along with buf_size set to 0.
3739 * Otherwise, this means the whole frame is available at this point.
3741 * @param avctx the codec context
3742 * @param buf the frame data buffer base
3743 * @param buf_size the size of the frame in bytes
3744 * @return zero if successful, a negative value otherwise
3746 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3749 * Callback for parameter data (SPS/PPS/VPS etc).
3751 * Useful for hardware decoders which keep persistent state about the
3752 * video parameters, and need to receive any changes to update that state.
3754 * @param avctx the codec context
3755 * @param type the nal unit type
3756 * @param buf the nal unit data buffer
3757 * @param buf_size the size of the nal unit in bytes
3758 * @return zero if successful, a negative value otherwise
3760 int (*decode_params)(AVCodecContext *avctx, int type, const uint8_t *buf, uint32_t buf_size);
3763 * Callback for each slice.
3765 * Meaningful slice information (codec specific) is guaranteed to
3766 * be parsed at this point. This function is mandatory.
3767 * The only exception is XvMC, that works on MB level.
3769 * @param avctx the codec context
3770 * @param buf the slice data buffer base
3771 * @param buf_size the size of the slice in bytes
3772 * @return zero if successful, a negative value otherwise
3774 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
3777 * Called at the end of each frame or field picture.
3779 * The whole picture is parsed at this point and can now be sent
3780 * to the hardware accelerator. This function is mandatory.
3782 * @param avctx the codec context
3783 * @return zero if successful, a negative value otherwise
3785 int (*end_frame)(AVCodecContext *avctx);
3788 * Size of per-frame hardware accelerator private data.
3790 * Private data is allocated with av_mallocz() before
3791 * AVCodecContext.get_buffer() and deallocated after
3792 * AVCodecContext.release_buffer().
3794 int frame_priv_data_size;
3797 * Called for every Macroblock in a slice.
3799 * XvMC uses it to replace the ff_mpv_reconstruct_mb().
3800 * Instead of decoding to raw picture, MB parameters are
3801 * stored in an array provided by the video driver.
3803 * @param s the mpeg context
3805 void (*decode_mb)(struct MpegEncContext *s);
3808 * Initialize the hwaccel private data.
3810 * This will be called from ff_get_format(), after hwaccel and
3811 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
3814 int (*init)(AVCodecContext *avctx);
3817 * Uninitialize the hwaccel private data.
3819 * This will be called from get_format() or avcodec_close(), after hwaccel
3820 * and hwaccel_context are already uninitialized.
3822 int (*uninit)(AVCodecContext *avctx);
3825 * Size of the private data to allocate in
3826 * AVCodecInternal.hwaccel_priv_data.
3831 * Internal hwaccel capabilities.
3836 * Fill the given hw_frames context with current codec parameters. Called
3837 * from get_format. Refer to avcodec_get_hw_frames_parameters() for
3840 * This CAN be called before AVHWAccel.init is called, and you must assume
3841 * that avctx->hwaccel_priv_data is invalid.
3843 int (*frame_params)(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
3847 * HWAccel is experimental and is thus avoided in favor of non experimental
3850 #define AV_HWACCEL_CODEC_CAP_EXPERIMENTAL 0x0200
3853 * Hardware acceleration should be used for decoding even if the codec level
3854 * used is unknown or higher than the maximum supported level reported by the
3857 * It's generally a good idea to pass this flag unless you have a specific
3858 * reason not to, as hardware tends to under-report supported levels.
3860 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3863 * Hardware acceleration can output YUV pixel formats with a different chroma
3864 * sampling than 4:2:0 and/or other than 8 bits per component.
3866 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3869 * Hardware acceleration should still be attempted for decoding when the
3870 * codec profile does not match the reported capabilities of the hardware.
3872 * For example, this can be used to try to decode baseline profile H.264
3873 * streams in hardware - it will often succeed, because many streams marked
3874 * as baseline profile actually conform to constrained baseline profile.
3876 * @warning If the stream is actually not supported then the behaviour is
3877 * undefined, and may include returning entirely incorrect output
3878 * while indicating success.
3880 #define AV_HWACCEL_FLAG_ALLOW_PROFILE_MISMATCH (1 << 2)
3886 #if FF_API_AVPICTURE
3888 * @defgroup lavc_picture AVPicture
3890 * Functions for working with AVPicture
3895 * Picture data structure.
3897 * Up to four components can be stored into it, the last component is
3899 * @deprecated use AVFrame or imgutils functions instead
3901 typedef struct AVPicture {
3902 attribute_deprecated
3903 uint8_t *data[AV_NUM_DATA_POINTERS]; ///< pointers to the image data planes
3904 attribute_deprecated
3905 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3913 enum AVSubtitleType {
3916 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3919 * Plain text, the text field must be set by the decoder and is
3920 * authoritative. ass and pict fields may contain approximations.
3925 * Formatted text, the ass field must be set by the decoder and is
3926 * authoritative. pict and text fields may contain approximations.
3931 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3933 typedef struct AVSubtitleRect {
3934 int x; ///< top left corner of pict, undefined when pict is not set
3935 int y; ///< top left corner of pict, undefined when pict is not set
3936 int w; ///< width of pict, undefined when pict is not set
3937 int h; ///< height of pict, undefined when pict is not set
3938 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3940 #if FF_API_AVPICTURE
3942 * @deprecated unused
3944 attribute_deprecated
3948 * data+linesize for the bitmap of this subtitle.
3949 * Can be set for text/ass as well once they are rendered.
3954 enum AVSubtitleType type;
3956 char *text; ///< 0 terminated plain UTF-8 text
3959 * 0 terminated ASS/SSA compatible event line.
3960 * The presentation of this is unaffected by the other values in this
3968 typedef struct AVSubtitle {
3969 uint16_t format; /* 0 = graphics */
3970 uint32_t start_display_time; /* relative to packet pts, in ms */
3971 uint32_t end_display_time; /* relative to packet pts, in ms */
3973 AVSubtitleRect **rects;
3974 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3978 * This struct describes the properties of an encoded stream.
3980 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
3981 * be allocated with avcodec_parameters_alloc() and freed with
3982 * avcodec_parameters_free().
3984 typedef struct AVCodecParameters {
3986 * General type of the encoded data.
3988 enum AVMediaType codec_type;
3990 * Specific type of the encoded data (the codec used).
3992 enum AVCodecID codec_id;
3994 * Additional information about the codec (corresponds to the AVI FOURCC).
3999 * Extra binary data needed for initializing the decoder, codec-dependent.
4001 * Must be allocated with av_malloc() and will be freed by
4002 * avcodec_parameters_free(). The allocated size of extradata must be at
4003 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
4008 * Size of the extradata content in bytes.
4013 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
4014 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
4019 * The average bitrate of the encoded data (in bits per second).
4024 * The number of bits per sample in the codedwords.
4026 * This is basically the bitrate per sample. It is mandatory for a bunch of
4027 * formats to actually decode them. It's the number of bits for one sample in
4028 * the actual coded bitstream.
4030 * This could be for example 4 for ADPCM
4031 * For PCM formats this matches bits_per_raw_sample
4034 int bits_per_coded_sample;
4037 * This is the number of valid bits in each output sample. If the
4038 * sample format has more bits, the least significant bits are additional
4039 * padding bits, which are always 0. Use right shifts to reduce the sample
4040 * to its actual size. For example, audio formats with 24 bit samples will
4041 * have bits_per_raw_sample set to 24, and format set to AV_SAMPLE_FMT_S32.
4042 * To get the original sample use "(int32_t)sample >> 8"."
4044 * For ADPCM this might be 12 or 16 or similar
4047 int bits_per_raw_sample;
4050 * Codec-specific bitstream restrictions that the stream conforms to.
4056 * Video only. The dimensions of the video frame in pixels.
4062 * Video only. The aspect ratio (width / height) which a single pixel
4063 * should have when displayed.
4065 * When the aspect ratio is unknown / undefined, the numerator should be
4066 * set to 0 (the denominator may have any value).
4068 AVRational sample_aspect_ratio;
4071 * Video only. The order of the fields in interlaced video.
4073 enum AVFieldOrder field_order;
4076 * Video only. Additional colorspace characteristics.
4078 enum AVColorRange color_range;
4079 enum AVColorPrimaries color_primaries;
4080 enum AVColorTransferCharacteristic color_trc;
4081 enum AVColorSpace color_space;
4082 enum AVChromaLocation chroma_location;
4085 * Video only. Number of delayed frames.
4090 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
4091 * unknown or unspecified, otherwise the number of bits set must be equal to
4092 * the channels field.
4094 uint64_t channel_layout;
4096 * Audio only. The number of audio channels.
4100 * Audio only. The number of audio samples per second.
4104 * Audio only. The number of bytes per coded audio frame, required by some
4107 * Corresponds to nBlockAlign in WAVEFORMATEX.
4111 * Audio only. Audio frame size, if known. Required by some formats to be static.
4116 * Audio only. The amount of padding (in samples) inserted by the encoder at
4117 * the beginning of the audio. I.e. this number of leading decoded samples
4118 * must be discarded by the caller to get the original audio without leading
4121 int initial_padding;
4123 * Audio only. The amount of padding (in samples) appended by the encoder to
4124 * the end of the audio. I.e. this number of decoded samples must be
4125 * discarded by the caller from the end of the stream to get the original
4126 * audio without any trailing padding.
4128 int trailing_padding;
4130 * Audio only. Number of samples to skip after a discontinuity.
4133 } AVCodecParameters;
4136 * Iterate over all registered codecs.
4138 * @param opaque a pointer where libavcodec will store the iteration state. Must
4139 * point to NULL to start the iteration.
4141 * @return the next registered codec or NULL when the iteration is
4144 const AVCodec *av_codec_iterate(void **opaque);
4148 * If c is NULL, returns the first registered codec,
4149 * if c is non-NULL, returns the next registered codec after c,
4150 * or NULL if c is the last one.
4152 attribute_deprecated
4153 AVCodec *av_codec_next(const AVCodec *c);
4157 * Return the LIBAVCODEC_VERSION_INT constant.
4159 unsigned avcodec_version(void);
4162 * Return the libavcodec build-time configuration.
4164 const char *avcodec_configuration(void);
4167 * Return the libavcodec license.
4169 const char *avcodec_license(void);
4173 * Register the codec codec and initialize libavcodec.
4175 * @warning either this function or avcodec_register_all() must be called
4176 * before any other libavcodec functions.
4178 * @see avcodec_register_all()
4180 attribute_deprecated
4181 void avcodec_register(AVCodec *codec);
4184 * Register all the codecs, parsers and bitstream filters which were enabled at
4185 * configuration time. If you do not call this function you can select exactly
4186 * which formats you want to support, by using the individual registration
4189 * @see avcodec_register
4190 * @see av_register_codec_parser
4191 * @see av_register_bitstream_filter
4193 attribute_deprecated
4194 void avcodec_register_all(void);
4198 * Allocate an AVCodecContext and set its fields to default values. The
4199 * resulting struct should be freed with avcodec_free_context().
4201 * @param codec if non-NULL, allocate private data and initialize defaults
4202 * for the given codec. It is illegal to then call avcodec_open2()
4203 * with a different codec.
4204 * If NULL, then the codec-specific defaults won't be initialized,
4205 * which may result in suboptimal default settings (this is
4206 * important mainly for encoders, e.g. libx264).
4208 * @return An AVCodecContext filled with default values or NULL on failure.
4210 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
4213 * Free the codec context and everything associated with it and write NULL to
4214 * the provided pointer.
4216 void avcodec_free_context(AVCodecContext **avctx);
4218 #if FF_API_GET_CONTEXT_DEFAULTS
4220 * @deprecated This function should not be used, as closing and opening a codec
4221 * context multiple time is not supported. A new codec context should be
4222 * allocated for each new use.
4224 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
4228 * Get the AVClass for AVCodecContext. It can be used in combination with
4229 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4231 * @see av_opt_find().
4233 const AVClass *avcodec_get_class(void);
4235 #if FF_API_COPY_CONTEXT
4237 * Get the AVClass for AVFrame. It can be used in combination with
4238 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4240 * @see av_opt_find().
4242 const AVClass *avcodec_get_frame_class(void);
4245 * Get the AVClass for AVSubtitleRect. It can be used in combination with
4246 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
4248 * @see av_opt_find().
4250 const AVClass *avcodec_get_subtitle_rect_class(void);
4253 * Copy the settings of the source AVCodecContext into the destination
4254 * AVCodecContext. The resulting destination codec context will be
4255 * unopened, i.e. you are required to call avcodec_open2() before you
4256 * can use this AVCodecContext to decode/encode video/audio data.
4258 * @param dest target codec context, should be initialized with
4259 * avcodec_alloc_context3(NULL), but otherwise uninitialized
4260 * @param src source codec context
4261 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
4263 * @deprecated The semantics of this function are ill-defined and it should not
4264 * be used. If you need to transfer the stream parameters from one codec context
4265 * to another, use an intermediate AVCodecParameters instance and the
4266 * avcodec_parameters_from_context() / avcodec_parameters_to_context()
4269 attribute_deprecated
4270 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
4274 * Allocate a new AVCodecParameters and set its fields to default values
4275 * (unknown/invalid/0). The returned struct must be freed with
4276 * avcodec_parameters_free().
4278 AVCodecParameters *avcodec_parameters_alloc(void);
4281 * Free an AVCodecParameters instance and everything associated with it and
4282 * write NULL to the supplied pointer.
4284 void avcodec_parameters_free(AVCodecParameters **par);
4287 * Copy the contents of src to dst. Any allocated fields in dst are freed and
4288 * replaced with newly allocated duplicates of the corresponding fields in src.
4290 * @return >= 0 on success, a negative AVERROR code on failure.
4292 int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
4295 * Fill the parameters struct based on the values from the supplied codec
4296 * context. Any allocated fields in par are freed and replaced with duplicates
4297 * of the corresponding fields in codec.
4299 * @return >= 0 on success, a negative AVERROR code on failure
4301 int avcodec_parameters_from_context(AVCodecParameters *par,
4302 const AVCodecContext *codec);
4305 * Fill the codec context based on the values from the supplied codec
4306 * parameters. Any allocated fields in codec that have a corresponding field in
4307 * par are freed and replaced with duplicates of the corresponding field in par.
4308 * Fields in codec that do not have a counterpart in par are not touched.
4310 * @return >= 0 on success, a negative AVERROR code on failure.
4312 int avcodec_parameters_to_context(AVCodecContext *codec,
4313 const AVCodecParameters *par);
4316 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
4317 * function the context has to be allocated with avcodec_alloc_context3().
4319 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
4320 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
4321 * retrieving a codec.
4323 * @warning This function is not thread safe!
4325 * @note Always call this function before using decoding routines (such as
4326 * @ref avcodec_receive_frame()).
4329 * avcodec_register_all();
4330 * av_dict_set(&opts, "b", "2.5M", 0);
4331 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
4335 * context = avcodec_alloc_context3(codec);
4337 * if (avcodec_open2(context, codec, opts) < 0)
4341 * @param avctx The context to initialize.
4342 * @param codec The codec to open this context for. If a non-NULL codec has been
4343 * previously passed to avcodec_alloc_context3() or
4344 * for this context, then this parameter MUST be either NULL or
4345 * equal to the previously passed codec.
4346 * @param options A dictionary filled with AVCodecContext and codec-private options.
4347 * On return this object will be filled with options that were not found.
4349 * @return zero on success, a negative value on error
4350 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
4351 * av_dict_set(), av_opt_find().
4353 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
4356 * Close a given AVCodecContext and free all the data associated with it
4357 * (but not the AVCodecContext itself).
4359 * Calling this function on an AVCodecContext that hasn't been opened will free
4360 * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
4361 * codec. Subsequent calls will do nothing.
4363 * @note Do not use this function. Use avcodec_free_context() to destroy a
4364 * codec context (either open or closed). Opening and closing a codec context
4365 * multiple times is not supported anymore -- use multiple codec contexts
4368 int avcodec_close(AVCodecContext *avctx);
4371 * Free all allocated data in the given subtitle struct.
4373 * @param sub AVSubtitle to free.
4375 void avsubtitle_free(AVSubtitle *sub);
4382 * @addtogroup lavc_packet
4387 * Allocate an AVPacket and set its fields to default values. The resulting
4388 * struct must be freed using av_packet_free().
4390 * @return An AVPacket filled with default values or NULL on failure.
4392 * @note this only allocates the AVPacket itself, not the data buffers. Those
4393 * must be allocated through other means such as av_new_packet.
4395 * @see av_new_packet
4397 AVPacket *av_packet_alloc(void);
4400 * Create a new packet that references the same data as src.
4402 * This is a shortcut for av_packet_alloc()+av_packet_ref().
4404 * @return newly created AVPacket on success, NULL on error.
4406 * @see av_packet_alloc
4407 * @see av_packet_ref
4409 AVPacket *av_packet_clone(const AVPacket *src);
4412 * Free the packet, if the packet is reference counted, it will be
4413 * unreferenced first.
4415 * @param pkt packet to be freed. The pointer will be set to NULL.
4416 * @note passing NULL is a no-op.
4418 void av_packet_free(AVPacket **pkt);
4421 * Initialize optional fields of a packet with default values.
4423 * Note, this does not touch the data and size members, which have to be
4424 * initialized separately.
4428 void av_init_packet(AVPacket *pkt);
4431 * Allocate the payload of a packet and initialize its fields with
4435 * @param size wanted payload size
4436 * @return 0 if OK, AVERROR_xxx otherwise
4438 int av_new_packet(AVPacket *pkt, int size);
4441 * Reduce packet size, correctly zeroing padding
4444 * @param size new size
4446 void av_shrink_packet(AVPacket *pkt, int size);
4449 * Increase packet size, correctly zeroing padding
4452 * @param grow_by number of bytes by which to increase the size of the packet
4454 int av_grow_packet(AVPacket *pkt, int grow_by);
4457 * Initialize a reference-counted packet from av_malloc()ed data.
4459 * @param pkt packet to be initialized. This function will set the data, size,
4460 * and buf fields, all others are left untouched.
4461 * @param data Data allocated by av_malloc() to be used as packet data. If this
4462 * function returns successfully, the data is owned by the underlying AVBuffer.
4463 * The caller may not access the data through other means.
4464 * @param size size of data in bytes, without the padding. I.e. the full buffer
4465 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
4467 * @return 0 on success, a negative AVERROR on error
4469 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
4471 #if FF_API_AVPACKET_OLD_API
4473 * @warning This is a hack - the packet memory allocation stuff is broken. The
4474 * packet is allocated if it was not really allocated.
4476 * @deprecated Use av_packet_ref or av_packet_make_refcounted
4478 attribute_deprecated
4479 int av_dup_packet(AVPacket *pkt);
4481 * Copy packet, including contents
4483 * @return 0 on success, negative AVERROR on fail
4485 * @deprecated Use av_packet_ref
4487 attribute_deprecated
4488 int av_copy_packet(AVPacket *dst, const AVPacket *src);
4491 * Copy packet side data
4493 * @return 0 on success, negative AVERROR on fail
4495 * @deprecated Use av_packet_copy_props
4497 attribute_deprecated
4498 int av_copy_packet_side_data(AVPacket *dst, const AVPacket *src);
4503 * @deprecated Use av_packet_unref
4505 * @param pkt packet to free
4507 attribute_deprecated
4508 void av_free_packet(AVPacket *pkt);
4511 * Allocate new information of a packet.
4514 * @param type side information type
4515 * @param size side information size
4516 * @return pointer to fresh allocated data or NULL otherwise
4518 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4522 * Wrap an existing array as a packet side data.
4525 * @param type side information type
4526 * @param data the side data array. It must be allocated with the av_malloc()
4527 * family of functions. The ownership of the data is transferred to
4529 * @param size side information size
4530 * @return a non-negative number on success, a negative AVERROR code on
4531 * failure. On failure, the packet is unchanged and the data remains
4532 * owned by the caller.
4534 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4535 uint8_t *data, size_t size);
4538 * Shrink the already allocated side data buffer
4541 * @param type side information type
4542 * @param size new side information size
4543 * @return 0 on success, < 0 on failure
4545 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
4549 * Get side information from packet.
4552 * @param type desired side information type
4553 * @param size pointer for side information size to store (optional)
4554 * @return pointer to data if present or NULL otherwise
4556 uint8_t* av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType type,
4559 #if FF_API_MERGE_SD_API
4560 attribute_deprecated
4561 int av_packet_merge_side_data(AVPacket *pkt);
4563 attribute_deprecated
4564 int av_packet_split_side_data(AVPacket *pkt);
4567 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
4570 * Pack a dictionary for use in side_data.
4572 * @param dict The dictionary to pack.
4573 * @param size pointer to store the size of the returned data
4574 * @return pointer to data if successful, NULL otherwise
4576 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
4578 * Unpack a dictionary from side_data.
4580 * @param data data from side_data
4581 * @param size size of the data
4582 * @param dict the metadata storage dictionary
4583 * @return 0 on success, < 0 on failure
4585 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
4589 * Convenience function to free all the side data stored.
4590 * All the other fields stay untouched.
4594 void av_packet_free_side_data(AVPacket *pkt);
4597 * Setup a new reference to the data described by a given packet
4599 * If src is reference-counted, setup dst as a new reference to the
4600 * buffer in src. Otherwise allocate a new buffer in dst and copy the
4601 * data from src into it.
4603 * All the other fields are copied from src.
4605 * @see av_packet_unref
4607 * @param dst Destination packet
4608 * @param src Source packet
4610 * @return 0 on success, a negative AVERROR on error.
4612 int av_packet_ref(AVPacket *dst, const AVPacket *src);
4617 * Unreference the buffer referenced by the packet and reset the
4618 * remaining packet fields to their default values.
4620 * @param pkt The packet to be unreferenced.
4622 void av_packet_unref(AVPacket *pkt);
4625 * Move every field in src to dst and reset src.
4627 * @see av_packet_unref
4629 * @param src Source packet, will be reset
4630 * @param dst Destination packet
4632 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
4635 * Copy only "properties" fields from src to dst.
4637 * Properties for the purpose of this function are all the fields
4638 * beside those related to the packet data (buf, data, size)
4640 * @param dst Destination packet
4641 * @param src Source packet
4643 * @return 0 on success AVERROR on failure.
4645 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
4648 * Ensure the data described by a given packet is reference counted.
4650 * @note This function does not ensure that the reference will be writable.
4651 * Use av_packet_make_writable instead for that purpose.
4653 * @see av_packet_ref
4654 * @see av_packet_make_writable
4656 * @param pkt packet whose data should be made reference counted.
4658 * @return 0 on success, a negative AVERROR on error. On failure, the
4659 * packet is unchanged.
4661 int av_packet_make_refcounted(AVPacket *pkt);
4664 * Create a writable reference for the data described by a given packet,
4665 * avoiding data copy if possible.
4667 * @param pkt Packet whose data should be made writable.
4669 * @return 0 on success, a negative AVERROR on failure. On failure, the
4670 * packet is unchanged.
4672 int av_packet_make_writable(AVPacket *pkt);
4675 * Convert valid timing fields (timestamps / durations) in a packet from one
4676 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
4679 * @param pkt packet on which the conversion will be performed
4680 * @param tb_src source timebase, in which the timing fields in pkt are
4682 * @param tb_dst destination timebase, to which the timing fields will be
4685 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
4692 * @addtogroup lavc_decoding
4697 * Find a registered decoder with a matching codec ID.
4699 * @param id AVCodecID of the requested decoder
4700 * @return A decoder if one was found, NULL otherwise.
4702 AVCodec *avcodec_find_decoder(enum AVCodecID id);
4705 * Find a registered decoder with the specified name.
4707 * @param name name of the requested decoder
4708 * @return A decoder if one was found, NULL otherwise.
4710 AVCodec *avcodec_find_decoder_by_name(const char *name);
4713 * The default callback for AVCodecContext.get_buffer2(). It is made public so
4714 * it can be called by custom get_buffer2() implementations for decoders without
4715 * AV_CODEC_CAP_DR1 set.
4717 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
4720 * Modify width and height values so that they will result in a memory
4721 * buffer that is acceptable for the codec if you do not use any horizontal
4724 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4726 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
4729 * Modify width and height values so that they will result in a memory
4730 * buffer that is acceptable for the codec if you also ensure that all
4731 * line sizes are a multiple of the respective linesize_align[i].
4733 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
4735 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
4736 int linesize_align[AV_NUM_DATA_POINTERS]);
4739 * Converts AVChromaLocation to swscale x/y chroma position.
4741 * The positions represent the chroma (0,0) position in a coordinates system
4742 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4744 * @param xpos horizontal chroma sample position
4745 * @param ypos vertical chroma sample position
4747 int avcodec_enum_to_chroma_pos(int *xpos, int *ypos, enum AVChromaLocation pos);
4750 * Converts swscale x/y chroma position to AVChromaLocation.
4752 * The positions represent the chroma (0,0) position in a coordinates system
4753 * with luma (0,0) representing the origin and luma(1,1) representing 256,256
4755 * @param xpos horizontal chroma sample position
4756 * @param ypos vertical chroma sample position
4758 enum AVChromaLocation avcodec_chroma_pos_to_enum(int xpos, int ypos);
4761 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
4763 * Some decoders may support multiple frames in a single AVPacket. Such
4764 * decoders would then just decode the first frame and the return value would be
4765 * less than the packet size. In this case, avcodec_decode_audio4 has to be
4766 * called again with an AVPacket containing the remaining data in order to
4767 * decode the second frame, etc... Even if no frames are returned, the packet
4768 * needs to be fed to the decoder with remaining data until it is completely
4769 * consumed or an error occurs.
4771 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4772 * and output. This means that for some packets they will not immediately
4773 * produce decoded output and need to be flushed at the end of decoding to get
4774 * all the decoded data. Flushing is done by calling this function with packets
4775 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4776 * returning samples. It is safe to flush even those decoders that are not
4777 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
4779 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4780 * larger than the actual read bytes because some optimized bitstream
4781 * readers read 32 or 64 bits at once and could read over the end.
4783 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4784 * before packets may be fed to the decoder.
4786 * @param avctx the codec context
4787 * @param[out] frame The AVFrame in which to store decoded audio samples.
4788 * The decoder will allocate a buffer for the decoded frame by
4789 * calling the AVCodecContext.get_buffer2() callback.
4790 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4791 * reference counted and the returned reference belongs to the
4792 * caller. The caller must release the frame using av_frame_unref()
4793 * when the frame is no longer needed. The caller may safely write
4794 * to the frame if av_frame_is_writable() returns 1.
4795 * When AVCodecContext.refcounted_frames is set to 0, the returned
4796 * reference belongs to the decoder and is valid only until the
4797 * next call to this function or until closing or flushing the
4798 * decoder. The caller may not write to it.
4799 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
4800 * non-zero. Note that this field being set to zero
4801 * does not mean that an error has occurred. For
4802 * decoders with AV_CODEC_CAP_DELAY set, no given decode
4803 * call is guaranteed to produce a frame.
4804 * @param[in] avpkt The input AVPacket containing the input buffer.
4805 * At least avpkt->data and avpkt->size should be set. Some
4806 * decoders might also require additional fields to be set.
4807 * @return A negative error code is returned if an error occurred during
4808 * decoding, otherwise the number of bytes consumed from the input
4809 * AVPacket is returned.
4811 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4813 attribute_deprecated
4814 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
4815 int *got_frame_ptr, const AVPacket *avpkt);
4818 * Decode the video frame of size avpkt->size from avpkt->data into picture.
4819 * Some decoders may support multiple frames in a single AVPacket, such
4820 * decoders would then just decode the first frame.
4822 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
4823 * the actual read bytes because some optimized bitstream readers read 32 or 64
4824 * bits at once and could read over the end.
4826 * @warning The end of the input buffer buf should be set to 0 to ensure that
4827 * no overreading happens for damaged MPEG streams.
4829 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
4830 * between input and output, these need to be fed with avpkt->data=NULL,
4831 * avpkt->size=0 at the end to return the remaining frames.
4833 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4834 * before packets may be fed to the decoder.
4836 * @param avctx the codec context
4837 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
4838 * Use av_frame_alloc() to get an AVFrame. The codec will
4839 * allocate memory for the actual bitmap by calling the
4840 * AVCodecContext.get_buffer2() callback.
4841 * When AVCodecContext.refcounted_frames is set to 1, the frame is
4842 * reference counted and the returned reference belongs to the
4843 * caller. The caller must release the frame using av_frame_unref()
4844 * when the frame is no longer needed. The caller may safely write
4845 * to the frame if av_frame_is_writable() returns 1.
4846 * When AVCodecContext.refcounted_frames is set to 0, the returned
4847 * reference belongs to the decoder and is valid only until the
4848 * next call to this function or until closing or flushing the
4849 * decoder. The caller may not write to it.
4851 * @param[in] avpkt The input AVPacket containing the input buffer.
4852 * You can create such packet with av_init_packet() and by then setting
4853 * data and size, some decoders might in addition need other fields like
4854 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
4856 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
4857 * @return On error a negative value is returned, otherwise the number of bytes
4858 * used or zero if no frame could be decompressed.
4860 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
4862 attribute_deprecated
4863 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
4864 int *got_picture_ptr,
4865 const AVPacket *avpkt);
4868 * Decode a subtitle message.
4869 * Return a negative value on error, otherwise return the number of bytes used.
4870 * If no subtitle could be decompressed, got_sub_ptr is zero.
4871 * Otherwise, the subtitle is stored in *sub.
4872 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
4873 * simplicity, because the performance difference is expected to be negligible
4874 * and reusing a get_buffer written for video codecs would probably perform badly
4875 * due to a potentially very different allocation pattern.
4877 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
4878 * and output. This means that for some packets they will not immediately
4879 * produce decoded output and need to be flushed at the end of decoding to get
4880 * all the decoded data. Flushing is done by calling this function with packets
4881 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
4882 * returning subtitles. It is safe to flush even those decoders that are not
4883 * marked with AV_CODEC_CAP_DELAY, then no subtitles will be returned.
4885 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4886 * before packets may be fed to the decoder.
4888 * @param avctx the codec context
4889 * @param[out] sub The preallocated AVSubtitle in which the decoded subtitle will be stored,
4890 * must be freed with avsubtitle_free if *got_sub_ptr is set.
4891 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
4892 * @param[in] avpkt The input AVPacket containing the input buffer.
4894 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
4899 * Supply raw packet data as input to a decoder.
4901 * Internally, this call will copy relevant AVCodecContext fields, which can
4902 * influence decoding per-packet, and apply them when the packet is actually
4903 * decoded. (For example AVCodecContext.skip_frame, which might direct the
4904 * decoder to drop the frame contained by the packet sent with this function.)
4906 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
4907 * larger than the actual read bytes because some optimized bitstream
4908 * readers read 32 or 64 bits at once and could read over the end.
4910 * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
4911 * on the same AVCodecContext. It will return unexpected results now
4912 * or in future libavcodec versions.
4914 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
4915 * before packets may be fed to the decoder.
4917 * @param avctx codec context
4918 * @param[in] avpkt The input AVPacket. Usually, this will be a single video
4919 * frame, or several complete audio frames.
4920 * Ownership of the packet remains with the caller, and the
4921 * decoder will not write to the packet. The decoder may create
4922 * a reference to the packet data (or copy it if the packet is
4923 * not reference-counted).
4924 * Unlike with older APIs, the packet is always fully consumed,
4925 * and if it contains multiple frames (e.g. some audio codecs),
4926 * will require you to call avcodec_receive_frame() multiple
4927 * times afterwards before you can send a new packet.
4928 * It can be NULL (or an AVPacket with data set to NULL and
4929 * size set to 0); in this case, it is considered a flush
4930 * packet, which signals the end of the stream. Sending the
4931 * first flush packet will return success. Subsequent ones are
4932 * unnecessary and will return AVERROR_EOF. If the decoder
4933 * still has frames buffered, it will return them after sending
4936 * @return 0 on success, otherwise negative error code:
4937 * AVERROR(EAGAIN): input is not accepted in the current state - user
4938 * must read output with avcodec_receive_frame() (once
4939 * all output is read, the packet should be resent, and
4940 * the call will not fail with EAGAIN).
4941 * AVERROR_EOF: the decoder has been flushed, and no new packets can
4942 * be sent to it (also returned if more than 1 flush
4944 * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
4945 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
4946 * other errors: legitimate decoding errors
4948 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
4951 * Return decoded output data from a decoder.
4953 * @param avctx codec context
4954 * @param frame This will be set to a reference-counted video or audio
4955 * frame (depending on the decoder type) allocated by the
4956 * decoder. Note that the function will always call
4957 * av_frame_unref(frame) before doing anything else.
4960 * 0: success, a frame was returned
4961 * AVERROR(EAGAIN): output is not available in this state - user must try
4963 * AVERROR_EOF: the decoder has been fully flushed, and there will be
4964 * no more output frames
4965 * AVERROR(EINVAL): codec not opened, or it is an encoder
4966 * AVERROR_INPUT_CHANGED: current decoded frame has changed parameters
4967 * with respect to first decoded frame. Applicable
4968 * when flag AV_CODEC_FLAG_DROPCHANGED is set.
4969 * other negative values: legitimate decoding errors
4971 int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
4974 * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
4975 * to retrieve buffered output packets.
4977 * @param avctx codec context
4978 * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
4979 * Ownership of the frame remains with the caller, and the
4980 * encoder will not write to the frame. The encoder may create
4981 * a reference to the frame data (or copy it if the frame is
4982 * not reference-counted).
4983 * It can be NULL, in which case it is considered a flush
4984 * packet. This signals the end of the stream. If the encoder
4985 * still has packets buffered, it will return them after this
4986 * call. Once flushing mode has been entered, additional flush
4987 * packets are ignored, and sending frames will return
4991 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4992 * can have any number of samples.
4993 * If it is not set, frame->nb_samples must be equal to
4994 * avctx->frame_size for all frames except the last.
4995 * The final frame may be smaller than avctx->frame_size.
4996 * @return 0 on success, otherwise negative error code:
4997 * AVERROR(EAGAIN): input is not accepted in the current state - user
4998 * must read output with avcodec_receive_packet() (once
4999 * all output is read, the packet should be resent, and
5000 * the call will not fail with EAGAIN).
5001 * AVERROR_EOF: the encoder has been flushed, and no new frames can
5003 * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
5004 * decoder, or requires flush
5005 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
5006 * other errors: legitimate decoding errors
5008 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
5011 * Read encoded data from the encoder.
5013 * @param avctx codec context
5014 * @param avpkt This will be set to a reference-counted packet allocated by the
5015 * encoder. Note that the function will always call
5016 * av_packet_unref(avpkt) before doing anything else.
5017 * @return 0 on success, otherwise negative error code:
5018 * AVERROR(EAGAIN): output is not available in the current state - user
5019 * must try to send input
5020 * AVERROR_EOF: the encoder has been fully flushed, and there will be
5021 * no more output packets
5022 * AVERROR(EINVAL): codec not opened, or it is an encoder
5023 * other errors: legitimate decoding errors
5025 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
5028 * Create and return a AVHWFramesContext with values adequate for hardware
5029 * decoding. This is meant to get called from the get_format callback, and is
5030 * a helper for preparing a AVHWFramesContext for AVCodecContext.hw_frames_ctx.
5031 * This API is for decoding with certain hardware acceleration modes/APIs only.
5033 * The returned AVHWFramesContext is not initialized. The caller must do this
5034 * with av_hwframe_ctx_init().
5036 * Calling this function is not a requirement, but makes it simpler to avoid
5037 * codec or hardware API specific details when manually allocating frames.
5039 * Alternatively to this, an API user can set AVCodecContext.hw_device_ctx,
5040 * which sets up AVCodecContext.hw_frames_ctx fully automatically, and makes
5041 * it unnecessary to call this function or having to care about
5042 * AVHWFramesContext initialization at all.
5044 * There are a number of requirements for calling this function:
5046 * - It must be called from get_format with the same avctx parameter that was
5047 * passed to get_format. Calling it outside of get_format is not allowed, and
5048 * can trigger undefined behavior.
5049 * - The function is not always supported (see description of return values).
5050 * Even if this function returns successfully, hwaccel initialization could
5051 * fail later. (The degree to which implementations check whether the stream
5052 * is actually supported varies. Some do this check only after the user's
5053 * get_format callback returns.)
5054 * - The hw_pix_fmt must be one of the choices suggested by get_format. If the
5055 * user decides to use a AVHWFramesContext prepared with this API function,
5056 * the user must return the same hw_pix_fmt from get_format.
5057 * - The device_ref passed to this function must support the given hw_pix_fmt.
5058 * - After calling this API function, it is the user's responsibility to
5059 * initialize the AVHWFramesContext (returned by the out_frames_ref parameter),
5060 * and to set AVCodecContext.hw_frames_ctx to it. If done, this must be done
5061 * before returning from get_format (this is implied by the normal
5062 * AVCodecContext.hw_frames_ctx API rules).
5063 * - The AVHWFramesContext parameters may change every time time get_format is
5064 * called. Also, AVCodecContext.hw_frames_ctx is reset before get_format. So
5065 * you are inherently required to go through this process again on every
5067 * - It is perfectly possible to call this function without actually using
5068 * the resulting AVHWFramesContext. One use-case might be trying to reuse a
5069 * previously initialized AVHWFramesContext, and calling this API function
5070 * only to test whether the required frame parameters have changed.
5071 * - Fields that use dynamically allocated values of any kind must not be set
5072 * by the user unless setting them is explicitly allowed by the documentation.
5073 * If the user sets AVHWFramesContext.free and AVHWFramesContext.user_opaque,
5074 * the new free callback must call the potentially set previous free callback.
5075 * This API call may set any dynamically allocated fields, including the free
5078 * The function will set at least the following fields on AVHWFramesContext
5079 * (potentially more, depending on hwaccel API):
5081 * - All fields set by av_hwframe_ctx_alloc().
5082 * - Set the format field to hw_pix_fmt.
5083 * - Set the sw_format field to the most suited and most versatile format. (An
5084 * implication is that this will prefer generic formats over opaque formats
5085 * with arbitrary restrictions, if possible.)
5086 * - Set the width/height fields to the coded frame size, rounded up to the
5087 * API-specific minimum alignment.
5088 * - Only _if_ the hwaccel requires a pre-allocated pool: set the initial_pool_size
5089 * field to the number of maximum reference surfaces possible with the codec,
5090 * plus 1 surface for the user to work (meaning the user can safely reference
5091 * at most 1 decoded surface at a time), plus additional buffering introduced
5092 * by frame threading. If the hwaccel does not require pre-allocation, the
5093 * field is left to 0, and the decoder will allocate new surfaces on demand
5095 * - Possibly AVHWFramesContext.hwctx fields, depending on the underlying
5098 * Essentially, out_frames_ref returns the same as av_hwframe_ctx_alloc(), but
5099 * with basic frame parameters set.
5101 * The function is stateless, and does not change the AVCodecContext or the
5102 * device_ref AVHWDeviceContext.
5104 * @param avctx The context which is currently calling get_format, and which
5105 * implicitly contains all state needed for filling the returned
5106 * AVHWFramesContext properly.
5107 * @param device_ref A reference to the AVHWDeviceContext describing the device
5108 * which will be used by the hardware decoder.
5109 * @param hw_pix_fmt The hwaccel format you are going to return from get_format.
5110 * @param out_frames_ref On success, set to a reference to an _uninitialized_
5111 * AVHWFramesContext, created from the given device_ref.
5112 * Fields will be set to values required for decoding.
5113 * Not changed if an error is returned.
5114 * @return zero on success, a negative value on error. The following error codes
5115 * have special semantics:
5116 * AVERROR(ENOENT): the decoder does not support this functionality. Setup
5117 * is always manual, or it is a decoder which does not
5118 * support setting AVCodecContext.hw_frames_ctx at all,
5119 * or it is a software format.
5120 * AVERROR(EINVAL): it is known that hardware decoding is not supported for
5121 * this configuration, or the device_ref is not supported
5122 * for the hwaccel referenced by hw_pix_fmt.
5124 int avcodec_get_hw_frames_parameters(AVCodecContext *avctx,
5125 AVBufferRef *device_ref,
5126 enum AVPixelFormat hw_pix_fmt,
5127 AVBufferRef **out_frames_ref);
5132 * @defgroup lavc_parsing Frame parsing
5136 enum AVPictureStructure {
5137 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
5138 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
5139 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
5140 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
5143 typedef struct AVCodecParserContext {
5145 struct AVCodecParser *parser;
5146 int64_t frame_offset; /* offset of the current frame */
5147 int64_t cur_offset; /* current offset
5148 (incremented by each av_parser_parse()) */
5149 int64_t next_frame_offset; /* offset of the next frame */
5151 int pict_type; /* XXX: Put it back in AVCodecContext. */
5153 * This field is used for proper frame duration computation in lavf.
5154 * It signals, how much longer the frame duration of the current frame
5155 * is compared to normal frame duration.
5157 * frame_duration = (1 + repeat_pict) * time_base
5159 * It is used by codecs like H.264 to display telecined material.
5161 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
5162 int64_t pts; /* pts of the current frame */
5163 int64_t dts; /* dts of the current frame */
5168 int fetch_timestamp;
5170 #define AV_PARSER_PTS_NB 4
5171 int cur_frame_start_index;
5172 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
5173 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
5174 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
5177 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
5178 #define PARSER_FLAG_ONCE 0x0002
5179 /// Set if the parser has a valid file offset
5180 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
5181 #define PARSER_FLAG_USE_CODEC_TS 0x1000
5183 int64_t offset; ///< byte offset from starting packet start
5184 int64_t cur_frame_end[AV_PARSER_PTS_NB];
5187 * Set by parser to 1 for key frames and 0 for non-key frames.
5188 * It is initialized to -1, so if the parser doesn't set this flag,
5189 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
5194 #if FF_API_CONVERGENCE_DURATION
5196 * @deprecated unused
5198 attribute_deprecated
5199 int64_t convergence_duration;
5202 // Timestamp generation support:
5204 * Synchronization point for start of timestamp generation.
5206 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
5209 * For example, this corresponds to presence of H.264 buffering period
5215 * Offset of the current timestamp against last timestamp sync point in
5216 * units of AVCodecContext.time_base.
5218 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5219 * contain a valid timestamp offset.
5221 * Note that the timestamp of sync point has usually a nonzero
5222 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
5223 * the next frame after timestamp sync point will be usually 1.
5225 * For example, this corresponds to H.264 cpb_removal_delay.
5227 int dts_ref_dts_delta;
5230 * Presentation delay of current frame in units of AVCodecContext.time_base.
5232 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
5233 * contain valid non-negative timestamp delta (presentation time of a frame
5234 * must not lie in the past).
5236 * This delay represents the difference between decoding and presentation
5237 * time of the frame.
5239 * For example, this corresponds to H.264 dpb_output_delay.
5244 * Position of the packet in file.
5246 * Analogous to cur_frame_pts/dts
5248 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
5251 * Byte position of currently parsed frame in stream.
5256 * Previous frame byte position.
5261 * Duration of the current frame.
5262 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
5263 * For all other types, this is in units of AVCodecContext.time_base.
5267 enum AVFieldOrder field_order;
5270 * Indicate whether a picture is coded as a frame, top field or bottom field.
5272 * For example, H.264 field_pic_flag equal to 0 corresponds to
5273 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
5274 * equal to 1 and bottom_field_flag equal to 0 corresponds to
5275 * AV_PICTURE_STRUCTURE_TOP_FIELD.
5277 enum AVPictureStructure picture_structure;
5280 * Picture number incremented in presentation or output order.
5281 * This field may be reinitialized at the first picture of a new sequence.
5283 * For example, this corresponds to H.264 PicOrderCnt.
5285 int output_picture_number;
5288 * Dimensions of the decoded video intended for presentation.
5294 * Dimensions of the coded video.
5300 * The format of the coded data, corresponds to enum AVPixelFormat for video
5301 * and for enum AVSampleFormat for audio.
5303 * Note that a decoder can have considerable freedom in how exactly it
5304 * decodes the data, so the format reported here might be different from the
5305 * one returned by a decoder.
5308 } AVCodecParserContext;
5310 typedef struct AVCodecParser {
5311 int codec_ids[5]; /* several codec IDs are permitted */
5313 int (*parser_init)(AVCodecParserContext *s);
5314 /* This callback never returns an error, a negative value means that
5315 * the frame start was in a previous packet. */
5316 int (*parser_parse)(AVCodecParserContext *s,
5317 AVCodecContext *avctx,
5318 const uint8_t **poutbuf, int *poutbuf_size,
5319 const uint8_t *buf, int buf_size);
5320 void (*parser_close)(AVCodecParserContext *s);
5321 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
5322 struct AVCodecParser *next;
5326 * Iterate over all registered codec parsers.
5328 * @param opaque a pointer where libavcodec will store the iteration state. Must
5329 * point to NULL to start the iteration.
5331 * @return the next registered codec parser or NULL when the iteration is
5334 const AVCodecParser *av_parser_iterate(void **opaque);
5336 attribute_deprecated
5337 AVCodecParser *av_parser_next(const AVCodecParser *c);
5339 attribute_deprecated
5340 void av_register_codec_parser(AVCodecParser *parser);
5341 AVCodecParserContext *av_parser_init(int codec_id);
5346 * @param s parser context.
5347 * @param avctx codec context.
5348 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
5349 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
5350 * @param buf input buffer.
5351 * @param buf_size buffer size in bytes without the padding. I.e. the full buffer
5352 size is assumed to be buf_size + AV_INPUT_BUFFER_PADDING_SIZE.
5353 To signal EOF, this should be 0 (so that the last frame
5355 * @param pts input presentation timestamp.
5356 * @param dts input decoding timestamp.
5357 * @param pos input byte position in stream.
5358 * @return the number of bytes of the input bitstream used.
5363 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
5370 * decode_frame(data, size);
5374 int av_parser_parse2(AVCodecParserContext *s,
5375 AVCodecContext *avctx,
5376 uint8_t **poutbuf, int *poutbuf_size,
5377 const uint8_t *buf, int buf_size,
5378 int64_t pts, int64_t dts,
5382 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
5383 * @deprecated use AVBitStreamFilter
5385 int av_parser_change(AVCodecParserContext *s,
5386 AVCodecContext *avctx,
5387 uint8_t **poutbuf, int *poutbuf_size,
5388 const uint8_t *buf, int buf_size, int keyframe);
5389 void av_parser_close(AVCodecParserContext *s);
5397 * @addtogroup lavc_encoding
5402 * Find a registered encoder with a matching codec ID.
5404 * @param id AVCodecID of the requested encoder
5405 * @return An encoder if one was found, NULL otherwise.
5407 AVCodec *avcodec_find_encoder(enum AVCodecID id);
5410 * Find a registered encoder with the specified name.
5412 * @param name name of the requested encoder
5413 * @return An encoder if one was found, NULL otherwise.
5415 AVCodec *avcodec_find_encoder_by_name(const char *name);
5418 * Encode a frame of audio.
5420 * Takes input samples from frame and writes the next output packet, if
5421 * available, to avpkt. The output packet does not necessarily contain data for
5422 * the most recent frame, as encoders can delay, split, and combine input frames
5423 * internally as needed.
5425 * @param avctx codec context
5426 * @param avpkt output AVPacket.
5427 * The user can supply an output buffer by setting
5428 * avpkt->data and avpkt->size prior to calling the
5429 * function, but if the size of the user-provided data is not
5430 * large enough, encoding will fail. If avpkt->data and
5431 * avpkt->size are set, avpkt->destruct must also be set. All
5432 * other AVPacket fields will be reset by the encoder using
5433 * av_init_packet(). If avpkt->data is NULL, the encoder will
5434 * allocate it. The encoder will set avpkt->size to the size
5435 * of the output packet.
5437 * If this function fails or produces no output, avpkt will be
5438 * freed using av_packet_unref().
5439 * @param[in] frame AVFrame containing the raw audio data to be encoded.
5440 * May be NULL when flushing an encoder that has the
5441 * AV_CODEC_CAP_DELAY capability set.
5442 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
5443 * can have any number of samples.
5444 * If it is not set, frame->nb_samples must be equal to
5445 * avctx->frame_size for all frames except the last.
5446 * The final frame may be smaller than avctx->frame_size.
5447 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5448 * output packet is non-empty, and to 0 if it is
5449 * empty. If the function returns an error, the
5450 * packet can be assumed to be invalid, and the
5451 * value of got_packet_ptr is undefined and should
5453 * @return 0 on success, negative error code on failure
5455 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5457 attribute_deprecated
5458 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
5459 const AVFrame *frame, int *got_packet_ptr);
5462 * Encode a frame of video.
5464 * Takes input raw video data from frame and writes the next output packet, if
5465 * available, to avpkt. The output packet does not necessarily contain data for
5466 * the most recent frame, as encoders can delay and reorder input frames
5467 * internally as needed.
5469 * @param avctx codec context
5470 * @param avpkt output AVPacket.
5471 * The user can supply an output buffer by setting
5472 * avpkt->data and avpkt->size prior to calling the
5473 * function, but if the size of the user-provided data is not
5474 * large enough, encoding will fail. All other AVPacket fields
5475 * will be reset by the encoder using av_init_packet(). If
5476 * avpkt->data is NULL, the encoder will allocate it.
5477 * The encoder will set avpkt->size to the size of the
5478 * output packet. The returned data (if any) belongs to the
5479 * caller, he is responsible for freeing it.
5481 * If this function fails or produces no output, avpkt will be
5482 * freed using av_packet_unref().
5483 * @param[in] frame AVFrame containing the raw video data to be encoded.
5484 * May be NULL when flushing an encoder that has the
5485 * AV_CODEC_CAP_DELAY capability set.
5486 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
5487 * output packet is non-empty, and to 0 if it is
5488 * empty. If the function returns an error, the
5489 * packet can be assumed to be invalid, and the
5490 * value of got_packet_ptr is undefined and should
5492 * @return 0 on success, negative error code on failure
5494 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
5496 attribute_deprecated
5497 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
5498 const AVFrame *frame, int *got_packet_ptr);
5500 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
5501 const AVSubtitle *sub);
5508 #if FF_API_AVPICTURE
5510 * @addtogroup lavc_picture
5515 * @deprecated unused
5517 attribute_deprecated
5518 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
5521 * @deprecated unused
5523 attribute_deprecated
5524 void avpicture_free(AVPicture *picture);
5527 * @deprecated use av_image_fill_arrays() instead.
5529 attribute_deprecated
5530 int avpicture_fill(AVPicture *picture, const uint8_t *ptr,
5531 enum AVPixelFormat pix_fmt, int width, int height);
5534 * @deprecated use av_image_copy_to_buffer() instead.
5536 attribute_deprecated
5537 int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt,
5538 int width, int height,
5539 unsigned char *dest, int dest_size);
5542 * @deprecated use av_image_get_buffer_size() instead.
5544 attribute_deprecated
5545 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
5548 * @deprecated av_image_copy() instead.
5550 attribute_deprecated
5551 void av_picture_copy(AVPicture *dst, const AVPicture *src,
5552 enum AVPixelFormat pix_fmt, int width, int height);
5555 * @deprecated unused
5557 attribute_deprecated
5558 int av_picture_crop(AVPicture *dst, const AVPicture *src,
5559 enum AVPixelFormat pix_fmt, int top_band, int left_band);
5562 * @deprecated unused
5564 attribute_deprecated
5565 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
5566 int padtop, int padbottom, int padleft, int padright, int *color);
5574 * @defgroup lavc_misc Utility functions
5577 * Miscellaneous utility functions related to both encoding and decoding
5583 * @defgroup lavc_misc_pixfmt Pixel formats
5585 * Functions for working with pixel formats.
5589 #if FF_API_GETCHROMA
5591 * @deprecated Use av_pix_fmt_get_chroma_sub_sample
5594 attribute_deprecated
5595 void avcodec_get_chroma_sub_sample(enum AVPixelFormat pix_fmt, int *h_shift, int *v_shift);
5599 * Return a value representing the fourCC code associated to the
5600 * pixel format pix_fmt, or 0 if no associated fourCC code can be
5603 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
5606 * @deprecated see av_get_pix_fmt_loss()
5608 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
5612 * Find the best pixel format to convert to given a certain source pixel
5613 * format. When converting from one pixel format to another, information loss
5614 * may occur. For example, when converting from RGB24 to GRAY, the color
5615 * information will be lost. Similarly, other losses occur when converting from
5616 * some formats to other formats. avcodec_find_best_pix_fmt_of_2() searches which of
5617 * the given pixel formats should be used to suffer the least amount of loss.
5618 * The pixel formats from which it chooses one, are determined by the
5619 * pix_fmt_list parameter.
5622 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
5623 * @param[in] src_pix_fmt source pixel format
5624 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
5625 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
5626 * @return The best pixel format to convert to or -1 if none was found.
5628 enum AVPixelFormat avcodec_find_best_pix_fmt_of_list(const enum AVPixelFormat *pix_fmt_list,
5629 enum AVPixelFormat src_pix_fmt,
5630 int has_alpha, int *loss_ptr);
5633 * @deprecated see av_find_best_pix_fmt_of_2()
5635 enum AVPixelFormat avcodec_find_best_pix_fmt_of_2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5636 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5638 attribute_deprecated
5639 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat dst_pix_fmt1, enum AVPixelFormat dst_pix_fmt2,
5640 enum AVPixelFormat src_pix_fmt, int has_alpha, int *loss_ptr);
5642 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
5648 #if FF_API_TAG_STRING
5650 * Put a string representing the codec tag codec_tag in buf.
5652 * @param buf buffer to place codec tag in
5653 * @param buf_size size in bytes of buf
5654 * @param codec_tag codec tag to assign
5655 * @return the length of the string that would have been generated if
5656 * enough space had been available, excluding the trailing null
5658 * @deprecated see av_fourcc_make_string() and av_fourcc2str().
5660 attribute_deprecated
5661 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
5664 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
5667 * Return a name for the specified profile, if available.
5669 * @param codec the codec that is searched for the given profile
5670 * @param profile the profile value for which a name is requested
5671 * @return A name for the profile if found, NULL otherwise.
5673 const char *av_get_profile_name(const AVCodec *codec, int profile);
5676 * Return a name for the specified profile, if available.
5678 * @param codec_id the ID of the codec to which the requested profile belongs
5679 * @param profile the profile value for which a name is requested
5680 * @return A name for the profile if found, NULL otherwise.
5682 * @note unlike av_get_profile_name(), which searches a list of profiles
5683 * supported by a specific decoder or encoder implementation, this
5684 * function searches the list of profiles from the AVCodecDescriptor
5686 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
5688 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
5689 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
5690 //FIXME func typedef
5693 * Fill AVFrame audio data and linesize pointers.
5695 * The buffer buf must be a preallocated buffer with a size big enough
5696 * to contain the specified samples amount. The filled AVFrame data
5697 * pointers will point to this buffer.
5699 * AVFrame extended_data channel pointers are allocated if necessary for
5702 * @param frame the AVFrame
5703 * frame->nb_samples must be set prior to calling the
5704 * function. This function fills in frame->data,
5705 * frame->extended_data, frame->linesize[0].
5706 * @param nb_channels channel count
5707 * @param sample_fmt sample format
5708 * @param buf buffer to use for frame data
5709 * @param buf_size size of buffer
5710 * @param align plane size sample alignment (0 = default)
5711 * @return >=0 on success, negative error code on failure
5712 * @todo return the size in bytes required to store the samples in
5713 * case of success, at the next libavutil bump
5715 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
5716 enum AVSampleFormat sample_fmt, const uint8_t *buf,
5717 int buf_size, int align);
5720 * Reset the internal decoder state / flush internal buffers. Should be called
5721 * e.g. when seeking or when switching to a different stream.
5723 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
5724 * this invalidates the frames previously returned from the decoder. When
5725 * refcounted frames are used, the decoder just releases any references it might
5726 * keep internally, but the caller's reference remains valid.
5728 void avcodec_flush_buffers(AVCodecContext *avctx);
5731 * Return codec bits per sample.
5733 * @param[in] codec_id the codec
5734 * @return Number of bits per sample or zero if unknown for the given codec.
5736 int av_get_bits_per_sample(enum AVCodecID codec_id);
5739 * Return the PCM codec associated with a sample format.
5740 * @param be endianness, 0 for little, 1 for big,
5741 * -1 (or anything else) for native
5742 * @return AV_CODEC_ID_PCM_* or AV_CODEC_ID_NONE
5744 enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be);
5747 * Return codec bits per sample.
5748 * Only return non-zero if the bits per sample is exactly correct, not an
5751 * @param[in] codec_id the codec
5752 * @return Number of bits per sample or zero if unknown for the given codec.
5754 int av_get_exact_bits_per_sample(enum AVCodecID codec_id);
5757 * Return audio frame duration.
5759 * @param avctx codec context
5760 * @param frame_bytes size of the frame, or 0 if unknown
5761 * @return frame duration, in samples, if known. 0 if not able to
5764 int av_get_audio_frame_duration(AVCodecContext *avctx, int frame_bytes);
5767 * This function is the same as av_get_audio_frame_duration(), except it works
5768 * with AVCodecParameters instead of an AVCodecContext.
5770 int av_get_audio_frame_duration2(AVCodecParameters *par, int frame_bytes);
5773 typedef struct AVBitStreamFilterContext {
5775 const struct AVBitStreamFilter *filter;
5776 AVCodecParserContext *parser;
5777 struct AVBitStreamFilterContext *next;
5779 * Internal default arguments, used if NULL is passed to av_bitstream_filter_filter().
5780 * Not for access by library users.
5783 } AVBitStreamFilterContext;
5786 typedef struct AVBSFInternal AVBSFInternal;
5789 * The bitstream filter state.
5791 * This struct must be allocated with av_bsf_alloc() and freed with
5794 * The fields in the struct will only be changed (by the caller or by the
5795 * filter) as described in their documentation, and are to be considered
5796 * immutable otherwise.
5798 typedef struct AVBSFContext {
5800 * A class for logging and AVOptions
5802 const AVClass *av_class;
5805 * The bitstream filter this context is an instance of.
5807 const struct AVBitStreamFilter *filter;
5810 * Opaque libavcodec internal data. Must not be touched by the caller in any
5813 AVBSFInternal *internal;
5816 * Opaque filter-specific private data. If filter->priv_class is non-NULL,
5817 * this is an AVOptions-enabled struct.
5822 * Parameters of the input stream. This field is allocated in
5823 * av_bsf_alloc(), it needs to be filled by the caller before
5826 AVCodecParameters *par_in;
5829 * Parameters of the output stream. This field is allocated in
5830 * av_bsf_alloc(), it is set by the filter in av_bsf_init().
5832 AVCodecParameters *par_out;
5835 * The timebase used for the timestamps of the input packets. Set by the
5836 * caller before av_bsf_init().
5838 AVRational time_base_in;
5841 * The timebase used for the timestamps of the output packets. Set by the
5842 * filter in av_bsf_init().
5844 AVRational time_base_out;
5847 typedef struct AVBitStreamFilter {
5851 * A list of codec ids supported by the filter, terminated by
5853 * May be NULL, in that case the bitstream filter works with any codec id.
5855 const enum AVCodecID *codec_ids;
5858 * A class for the private data, used to declare bitstream filter private
5859 * AVOptions. This field is NULL for bitstream filters that do not declare
5862 * If this field is non-NULL, the first member of the filter private data
5863 * must be a pointer to AVClass, which will be set by libavcodec generic
5864 * code to this class.
5866 const AVClass *priv_class;
5868 /*****************************************************************
5869 * No fields below this line are part of the public API. They
5870 * may not be used outside of libavcodec and can be changed and
5872 * New public fields should be added right above.
5873 *****************************************************************
5877 int (*init)(AVBSFContext *ctx);
5878 int (*filter)(AVBSFContext *ctx, AVPacket *pkt);
5879 void (*close)(AVBSFContext *ctx);
5880 void (*flush)(AVBSFContext *ctx);
5881 } AVBitStreamFilter;
5885 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5886 * is deprecated. Use the new bitstream filtering API (using AVBSFContext).
5888 attribute_deprecated
5889 void av_register_bitstream_filter(AVBitStreamFilter *bsf);
5891 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5892 * is deprecated. Use av_bsf_get_by_name(), av_bsf_alloc(), and av_bsf_init()
5893 * from the new bitstream filtering API (using AVBSFContext).
5895 attribute_deprecated
5896 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name);
5898 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5899 * is deprecated. Use av_bsf_send_packet() and av_bsf_receive_packet() from the
5900 * new bitstream filtering API (using AVBSFContext).
5902 attribute_deprecated
5903 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
5904 AVCodecContext *avctx, const char *args,
5905 uint8_t **poutbuf, int *poutbuf_size,
5906 const uint8_t *buf, int buf_size, int keyframe);
5908 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5909 * is deprecated. Use av_bsf_free() from the new bitstream filtering API (using
5912 attribute_deprecated
5913 void av_bitstream_filter_close(AVBitStreamFilterContext *bsf);
5915 * @deprecated the old bitstream filtering API (using AVBitStreamFilterContext)
5916 * is deprecated. Use av_bsf_iterate() from the new bitstream filtering API (using
5919 attribute_deprecated
5920 const AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f);
5924 * @return a bitstream filter with the specified name or NULL if no such
5925 * bitstream filter exists.
5927 const AVBitStreamFilter *av_bsf_get_by_name(const char *name);
5930 * Iterate over all registered bitstream filters.
5932 * @param opaque a pointer where libavcodec will store the iteration state. Must
5933 * point to NULL to start the iteration.
5935 * @return the next registered bitstream filter or NULL when the iteration is
5938 const AVBitStreamFilter *av_bsf_iterate(void **opaque);
5940 attribute_deprecated
5941 const AVBitStreamFilter *av_bsf_next(void **opaque);
5945 * Allocate a context for a given bitstream filter. The caller must fill in the
5946 * context parameters as described in the documentation and then call
5947 * av_bsf_init() before sending any data to the filter.
5949 * @param filter the filter for which to allocate an instance.
5950 * @param ctx a pointer into which the pointer to the newly-allocated context
5951 * will be written. It must be freed with av_bsf_free() after the
5952 * filtering is done.
5954 * @return 0 on success, a negative AVERROR code on failure
5956 int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **ctx);
5959 * Prepare the filter for use, after all the parameters and options have been
5962 int av_bsf_init(AVBSFContext *ctx);
5965 * Submit a packet for filtering.
5967 * After sending each packet, the filter must be completely drained by calling
5968 * av_bsf_receive_packet() repeatedly until it returns AVERROR(EAGAIN) or
5971 * @param pkt the packet to filter. The bitstream filter will take ownership of
5972 * the packet and reset the contents of pkt. pkt is not touched if an error occurs.
5973 * If pkt is empty (i.e. NULL, or pkt->data is NULL and pkt->side_data_elems zero),
5974 * it signals the end of the stream (i.e. no more non-empty packets will be sent;
5975 * sending more empty packets does nothing) and will cause the filter to output
5976 * any packets it may have buffered internally.
5978 * @return 0 on success, a negative AVERROR on error. This function never fails if
5981 int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt);
5984 * Retrieve a filtered packet.
5986 * @param[out] pkt this struct will be filled with the contents of the filtered
5987 * packet. It is owned by the caller and must be freed using
5988 * av_packet_unref() when it is no longer needed.
5989 * This parameter should be "clean" (i.e. freshly allocated
5990 * with av_packet_alloc() or unreffed with av_packet_unref())
5991 * when this function is called. If this function returns
5992 * successfully, the contents of pkt will be completely
5993 * overwritten by the returned data. On failure, pkt is not
5996 * @return 0 on success. AVERROR(EAGAIN) if more packets need to be sent to the
5997 * filter (using av_bsf_send_packet()) to get more output. AVERROR_EOF if there
5998 * will be no further output from the filter. Another negative AVERROR value if
6001 * @note one input packet may result in several output packets, so after sending
6002 * a packet with av_bsf_send_packet(), this function needs to be called
6003 * repeatedly until it stops returning 0. It is also possible for a filter to
6004 * output fewer packets than were sent to it, so this function may return
6005 * AVERROR(EAGAIN) immediately after a successful av_bsf_send_packet() call.
6007 int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt);
6010 * Reset the internal bitstream filter state / flush internal buffers.
6012 void av_bsf_flush(AVBSFContext *ctx);
6015 * Free a bitstream filter context and everything associated with it; write NULL
6016 * into the supplied pointer.
6018 void av_bsf_free(AVBSFContext **ctx);
6021 * Get the AVClass for AVBSFContext. It can be used in combination with
6022 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
6024 * @see av_opt_find().
6026 const AVClass *av_bsf_get_class(void);
6029 * Structure for chain/list of bitstream filters.
6030 * Empty list can be allocated by av_bsf_list_alloc().
6032 typedef struct AVBSFList AVBSFList;
6035 * Allocate empty list of bitstream filters.
6036 * The list must be later freed by av_bsf_list_free()
6037 * or finalized by av_bsf_list_finalize().
6039 * @return Pointer to @ref AVBSFList on success, NULL in case of failure
6041 AVBSFList *av_bsf_list_alloc(void);
6044 * Free list of bitstream filters.
6046 * @param lst Pointer to pointer returned by av_bsf_list_alloc()
6048 void av_bsf_list_free(AVBSFList **lst);
6051 * Append bitstream filter to the list of bitstream filters.
6053 * @param lst List to append to
6054 * @param bsf Filter context to be appended
6056 * @return >=0 on success, negative AVERROR in case of failure
6058 int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf);
6061 * Construct new bitstream filter context given it's name and options
6062 * and append it to the list of bitstream filters.
6064 * @param lst List to append to
6065 * @param bsf_name Name of the bitstream filter
6066 * @param options Options for the bitstream filter, can be set to NULL
6068 * @return >=0 on success, negative AVERROR in case of failure
6070 int av_bsf_list_append2(AVBSFList *lst, const char * bsf_name, AVDictionary **options);
6072 * Finalize list of bitstream filters.
6074 * This function will transform @ref AVBSFList to single @ref AVBSFContext,
6075 * so the whole chain of bitstream filters can be treated as single filter
6076 * freshly allocated by av_bsf_alloc().
6077 * If the call is successful, @ref AVBSFList structure is freed and lst
6078 * will be set to NULL. In case of failure, caller is responsible for
6079 * freeing the structure by av_bsf_list_free()
6081 * @param lst Filter list structure to be transformed
6082 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6083 * representing the chain of bitstream filters
6085 * @return >=0 on success, negative AVERROR in case of failure
6087 int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf);
6090 * Parse string describing list of bitstream filters and create single
6091 * @ref AVBSFContext describing the whole chain of bitstream filters.
6092 * Resulting @ref AVBSFContext can be treated as any other @ref AVBSFContext freshly
6093 * allocated by av_bsf_alloc().
6095 * @param str String describing chain of bitstream filters in format
6096 * `bsf1[=opt1=val1:opt2=val2][,bsf2]`
6097 * @param[out] bsf Pointer to be set to newly created @ref AVBSFContext structure
6098 * representing the chain of bitstream filters
6100 * @return >=0 on success, negative AVERROR in case of failure
6102 int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf);
6105 * Get null/pass-through bitstream filter.
6107 * @param[out] bsf Pointer to be set to new instance of pass-through bitstream filter
6111 int av_bsf_get_null_filter(AVBSFContext **bsf);
6116 * Same behaviour av_fast_malloc but the buffer has additional
6117 * AV_INPUT_BUFFER_PADDING_SIZE at the end which will always be 0.
6119 * In addition the whole buffer will initially and after resizes
6120 * be 0-initialized so that no uninitialized data will ever appear.
6122 void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
6125 * Same behaviour av_fast_padded_malloc except that buffer will always
6126 * be 0-initialized after call.
6128 void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size);
6131 * Encode extradata length to a buffer. Used by xiph codecs.
6133 * @param s buffer to write to; must be at least (v/255+1) bytes long
6134 * @param v size of extradata in bytes
6135 * @return number of bytes written to the buffer.
6137 unsigned int av_xiphlacing(unsigned char *s, unsigned int v);
6139 #if FF_API_USER_VISIBLE_AVHWACCEL
6141 * Register the hardware accelerator hwaccel.
6143 * @deprecated This function doesn't do anything.
6145 attribute_deprecated
6146 void av_register_hwaccel(AVHWAccel *hwaccel);
6149 * If hwaccel is NULL, returns the first registered hardware accelerator,
6150 * if hwaccel is non-NULL, returns the next registered hardware accelerator
6151 * after hwaccel, or NULL if hwaccel is the last one.
6153 * @deprecated AVHWaccel structures contain no user-serviceable parts, so
6154 * this function should not be used.
6156 attribute_deprecated
6157 AVHWAccel *av_hwaccel_next(const AVHWAccel *hwaccel);
6162 * Lock operation used by lockmgr
6164 * @deprecated Deprecated together with av_lockmgr_register().
6167 AV_LOCK_CREATE, ///< Create a mutex
6168 AV_LOCK_OBTAIN, ///< Lock the mutex
6169 AV_LOCK_RELEASE, ///< Unlock the mutex
6170 AV_LOCK_DESTROY, ///< Free mutex resources
6174 * Register a user provided lock manager supporting the operations
6175 * specified by AVLockOp. The "mutex" argument to the function points
6176 * to a (void *) where the lockmgr should store/get a pointer to a user
6177 * allocated mutex. It is NULL upon AV_LOCK_CREATE and equal to the
6178 * value left by the last call for all other ops. If the lock manager is
6179 * unable to perform the op then it should leave the mutex in the same
6180 * state as when it was called and return a non-zero value. However,
6181 * when called with AV_LOCK_DESTROY the mutex will always be assumed to
6182 * have been successfully destroyed. If av_lockmgr_register succeeds
6183 * it will return a non-negative value, if it fails it will return a
6184 * negative value and destroy all mutex and unregister all callbacks.
6185 * av_lockmgr_register is not thread-safe, it must be called from a
6186 * single thread before any calls which make use of locking are used.
6188 * @param cb User defined callback. av_lockmgr_register invokes calls
6189 * to this callback and the previously registered callback.
6190 * The callback will be used to create more than one mutex
6191 * each of which must be backed by its own underlying locking
6192 * mechanism (i.e. do not use a single static object to
6193 * implement your lock manager). If cb is set to NULL the
6194 * lockmgr will be unregistered.
6196 * @deprecated This function does nothing, and always returns 0. Be sure to
6197 * build with thread support to get basic thread safety.
6199 attribute_deprecated
6200 int av_lockmgr_register(int (*cb)(void **mutex, enum AVLockOp op));
6204 * Get the type of the given codec.
6206 enum AVMediaType avcodec_get_type(enum AVCodecID codec_id);
6209 * Get the name of a codec.
6210 * @return a static string identifying the codec; never NULL
6212 const char *avcodec_get_name(enum AVCodecID id);
6215 * @return a positive value if s is open (i.e. avcodec_open2() was called on it
6216 * with no corresponding avcodec_close()), 0 otherwise.
6218 int avcodec_is_open(AVCodecContext *s);
6221 * @return a non-zero number if codec is an encoder, zero otherwise
6223 int av_codec_is_encoder(const AVCodec *codec);
6226 * @return a non-zero number if codec is a decoder, zero otherwise
6228 int av_codec_is_decoder(const AVCodec *codec);
6231 * @return descriptor for given codec ID or NULL if no descriptor exists.
6233 const AVCodecDescriptor *avcodec_descriptor_get(enum AVCodecID id);
6236 * Iterate over all codec descriptors known to libavcodec.
6238 * @param prev previous descriptor. NULL to get the first descriptor.
6240 * @return next descriptor or NULL after the last descriptor
6242 const AVCodecDescriptor *avcodec_descriptor_next(const AVCodecDescriptor *prev);
6245 * @return codec descriptor with the given name or NULL if no such descriptor
6248 const AVCodecDescriptor *avcodec_descriptor_get_by_name(const char *name);
6251 * Allocate a CPB properties structure and initialize its fields to default
6254 * @param size if non-NULL, the size of the allocated struct will be written
6255 * here. This is useful for embedding it in side data.
6257 * @return the newly allocated struct or NULL on failure
6259 AVCPBProperties *av_cpb_properties_alloc(size_t *size);
6265 #endif /* AVCODEC_AVCODEC_H */