3118b10e9b963cc160112364bb617e5ace0d7785
[libav.git] / libavcodec / avcodec.h
1 /*
2 * copyright (c) 2001 Fabrice Bellard
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVCODEC_AVCODEC_H
22 #define AVCODEC_AVCODEC_H
23
24 /**
25 * @file
26 * @ingroup libavc
27 * Libavcodec external API header
28 */
29
30 #include <errno.h>
31 #include "libavutil/samplefmt.h"
32 #include "libavutil/attributes.h"
33 #include "libavutil/avutil.h"
34 #include "libavutil/buffer.h"
35 #include "libavutil/cpu.h"
36 #include "libavutil/dict.h"
37 #include "libavutil/frame.h"
38 #include "libavutil/log.h"
39 #include "libavutil/pixfmt.h"
40 #include "libavutil/rational.h"
41
42 #include "version.h"
43
44 /**
45 * @defgroup libavc Encoding/Decoding Library
46 * @{
47 *
48 * @defgroup lavc_decoding Decoding
49 * @{
50 * @}
51 *
52 * @defgroup lavc_encoding Encoding
53 * @{
54 * @}
55 *
56 * @defgroup lavc_codec Codecs
57 * @{
58 * @defgroup lavc_codec_native Native Codecs
59 * @{
60 * @}
61 * @defgroup lavc_codec_wrappers External library wrappers
62 * @{
63 * @}
64 * @defgroup lavc_codec_hwaccel Hardware Accelerators bridge
65 * @{
66 * @}
67 * @}
68 * @defgroup lavc_internal Internal
69 * @{
70 * @}
71 * @}
72 */
73
74 /**
75 * @ingroup libavc
76 * @defgroup lavc_encdec send/receive encoding and decoding API overview
77 * @{
78 *
79 * The avcodec_send_packet()/avcodec_receive_frame()/avcodec_send_frame()/
80 * avcodec_receive_packet() functions provide an encode/decode API, which
81 * decouples input and output.
82 *
83 * The API is very similar for encoding/decoding and audio/video, and works as
84 * follows:
85 * - Set up and open the AVCodecContext as usual.
86 * - Send valid input:
87 * - For decoding, call avcodec_send_packet() to give the decoder raw
88 * compressed data in an AVPacket.
89 * - For encoding, call avcodec_send_frame() to give the decoder an AVFrame
90 * containing uncompressed audio or video.
91 * In both cases, it is recommended that AVPackets and AVFrames are
92 * refcounted, or libavcodec might have to copy the input data. (libavformat
93 * always returns refcounted AVPackets, and av_frame_get_buffer() allocates
94 * refcounted AVFrames.)
95 * - Receive output in a loop. Periodically call one of the avcodec_receive_*()
96 * functions and process their output:
97 * - For decoding, call avcodec_receive_frame(). On success, it will return
98 * an AVFrame containing uncompressed audio or video data.
99 * - For encoding, call avcodec_receive_packet(). On success, it will return
100 * an AVPacket with a compressed frame.
101 * Repeat this call until it returns AVERROR(EAGAIN) or an error. The
102 * AVERROR(EAGAIN) return value means that new input data is required to
103 * return new output. In this case, continue with sending input. For each
104 * input frame/packet, the codec will typically return 1 output frame/packet,
105 * but it can also be 0 or more than 1.
106 *
107 * At the beginning of decoding or encoding, the codec might accept multiple
108 * input frames/packets without returning a frame, until its internal buffers
109 * are filled. This situation is handled transparently if you follow the steps
110 * outlined above.
111 *
112 * In theory, sending input can result in EAGAIN - this should happen only if
113 * not all output was received. You can use this to structure alternative decode
114 * or encode loops other than the one suggested above. For example, you could
115 * try sending new input on each iteration, and try to receive output if that
116 * returns EAGAIN.
117 *
118 * End of stream situations. These require "flushing" (aka draining) the codec,
119 * as the codec might buffer multiple frames or packets internally for
120 * performance or out of necessity (consider B-frames).
121 * This is handled as follows:
122 * - Instead of valid input, send NULL to the avcodec_send_packet() (decoding)
123 * or avcodec_send_frame() (encoding) functions. This will enter draining
124 * mode.
125 * - Call avcodec_receive_frame() (decoding) or avcodec_receive_packet()
126 * (encoding) in a loop until AVERROR_EOF is returned. The functions will
127 * not return AVERROR(EAGAIN), unless you forgot to enter draining mode.
128 * - Before decoding can be resumed again, the codec has to be reset with
129 * avcodec_flush_buffers().
130 *
131 * Using the API as outlined above is highly recommended. But it is also
132 * possible to call functions outside of this rigid schema. For example, you can
133 * call avcodec_send_packet() repeatedly without calling
134 * avcodec_receive_frame(). In this case, avcodec_send_packet() will succeed
135 * until the codec's internal buffer has been filled up (which is typically of
136 * size 1 per output frame, after initial input), and then reject input with
137 * AVERROR(EAGAIN). Once it starts rejecting input, you have no choice but to
138 * read at least some output.
139 *
140 * Not all codecs will follow a rigid and predictable dataflow; the only
141 * guarantee is that an AVERROR(EAGAIN) return value on a send/receive call on
142 * one end implies that a receive/send call on the other end will succeed. In
143 * general, no codec will permit unlimited buffering of input or output.
144 *
145 * This API replaces the following legacy functions:
146 * - avcodec_decode_video2() and avcodec_decode_audio4():
147 * Use avcodec_send_packet() to feed input to the decoder, then use
148 * avcodec_receive_frame() to receive decoded frames after each packet.
149 * Unlike with the old video decoding API, multiple frames might result from
150 * a packet. For audio, splitting the input packet into frames by partially
151 * decoding packets becomes transparent to the API user. You never need to
152 * feed an AVPacket to the API twice (unless it is rejected with EAGAIN - then
153 * no data was read from the packet).
154 * Additionally, sending a flush/draining packet is required only once.
155 * - avcodec_encode_video2()/avcodec_encode_audio2():
156 * Use avcodec_send_frame() to feed input to the encoder, then use
157 * avcodec_receive_packet() to receive encoded packets.
158 * Providing user-allocated buffers for avcodec_receive_packet() is not
159 * possible.
160 * - The new API does not handle subtitles yet.
161 *
162 * Mixing new and old function calls on the same AVCodecContext is not allowed,
163 * and will result in arbitrary behavior.
164 *
165 * Some codecs might require using the new API; using the old API will return
166 * an error when calling it. All codecs support the new API.
167 *
168 * A codec is not allowed to return EAGAIN for both sending and receiving. This
169 * would be an invalid state, which could put the codec user into an endless
170 * loop. The API has no concept of time either: it cannot happen that trying to
171 * do avcodec_send_packet() results in EAGAIN, but a repeated call 1 second
172 * later accepts the packet (with no other receive/flush API calls involved).
173 * The API is a strict state machine, and the passage of time is not supposed
174 * to influence it. Some timing-dependent behavior might still be deemed
175 * acceptable in certain cases. But it must never result in both send/receive
176 * returning EAGAIN at the same time at any point. It must also absolutely be
177 * avoided that the current state is "unstable" and can "flip-flop" between
178 * the send/receive APIs allowing progress. For example, it's not allowed that
179 * the codec randomly decides that it actually wants to consume a packet now
180 * instead of returning a frame, after it just returned EAGAIN on an
181 * avcodec_send_packet() call.
182 * @}
183 */
184
185 /**
186 * @defgroup lavc_core Core functions/structures.
187 * @ingroup libavc
188 *
189 * Basic definitions, functions for querying libavcodec capabilities,
190 * allocating core structures, etc.
191 * @{
192 */
193
194
195 /**
196 * Identify the syntax and semantics of the bitstream.
197 * The principle is roughly:
198 * Two decoders with the same ID can decode the same streams.
199 * Two encoders with the same ID can encode compatible streams.
200 * There may be slight deviations from the principle due to implementation
201 * details.
202 *
203 * If you add a codec ID to this list, add it so that
204 * 1. no value of a existing codec ID changes (that would break ABI),
205 * 2. it is as close as possible to similar codecs.
206 *
207 * After adding new codec IDs, do not forget to add an entry to the codec
208 * descriptor list and bump libavcodec minor version.
209 */
210 enum AVCodecID {
211 AV_CODEC_ID_NONE,
212
213 /* video codecs */
214 AV_CODEC_ID_MPEG1VIDEO,
215 AV_CODEC_ID_MPEG2VIDEO, ///< preferred ID for MPEG-1/2 video decoding
216 AV_CODEC_ID_H261,
217 AV_CODEC_ID_H263,
218 AV_CODEC_ID_RV10,
219 AV_CODEC_ID_RV20,
220 AV_CODEC_ID_MJPEG,
221 AV_CODEC_ID_MJPEGB,
222 AV_CODEC_ID_LJPEG,
223 AV_CODEC_ID_SP5X,
224 AV_CODEC_ID_JPEGLS,
225 AV_CODEC_ID_MPEG4,
226 AV_CODEC_ID_RAWVIDEO,
227 AV_CODEC_ID_MSMPEG4V1,
228 AV_CODEC_ID_MSMPEG4V2,
229 AV_CODEC_ID_MSMPEG4V3,
230 AV_CODEC_ID_WMV1,
231 AV_CODEC_ID_WMV2,
232 AV_CODEC_ID_H263P,
233 AV_CODEC_ID_H263I,
234 AV_CODEC_ID_FLV1,
235 AV_CODEC_ID_SVQ1,
236 AV_CODEC_ID_SVQ3,
237 AV_CODEC_ID_DVVIDEO,
238 AV_CODEC_ID_HUFFYUV,
239 AV_CODEC_ID_CYUV,
240 AV_CODEC_ID_H264,
241 AV_CODEC_ID_INDEO3,
242 AV_CODEC_ID_VP3,
243 AV_CODEC_ID_THEORA,
244 AV_CODEC_ID_ASV1,
245 AV_CODEC_ID_ASV2,
246 AV_CODEC_ID_FFV1,
247 AV_CODEC_ID_4XM,
248 AV_CODEC_ID_VCR1,
249 AV_CODEC_ID_CLJR,
250 AV_CODEC_ID_MDEC,
251 AV_CODEC_ID_ROQ,
252 AV_CODEC_ID_INTERPLAY_VIDEO,
253 AV_CODEC_ID_XAN_WC3,
254 AV_CODEC_ID_XAN_WC4,
255 AV_CODEC_ID_RPZA,
256 AV_CODEC_ID_CINEPAK,
257 AV_CODEC_ID_WS_VQA,
258 AV_CODEC_ID_MSRLE,
259 AV_CODEC_ID_MSVIDEO1,
260 AV_CODEC_ID_IDCIN,
261 AV_CODEC_ID_8BPS,
262 AV_CODEC_ID_SMC,
263 AV_CODEC_ID_FLIC,
264 AV_CODEC_ID_TRUEMOTION1,
265 AV_CODEC_ID_VMDVIDEO,
266 AV_CODEC_ID_MSZH,
267 AV_CODEC_ID_ZLIB,
268 AV_CODEC_ID_QTRLE,
269 AV_CODEC_ID_TSCC,
270 AV_CODEC_ID_ULTI,
271 AV_CODEC_ID_QDRAW,
272 AV_CODEC_ID_VIXL,
273 AV_CODEC_ID_QPEG,
274 AV_CODEC_ID_PNG,
275 AV_CODEC_ID_PPM,
276 AV_CODEC_ID_PBM,
277 AV_CODEC_ID_PGM,
278 AV_CODEC_ID_PGMYUV,
279 AV_CODEC_ID_PAM,
280 AV_CODEC_ID_FFVHUFF,
281 AV_CODEC_ID_RV30,
282 AV_CODEC_ID_RV40,
283 AV_CODEC_ID_VC1,
284 AV_CODEC_ID_WMV3,
285 AV_CODEC_ID_LOCO,
286 AV_CODEC_ID_WNV1,
287 AV_CODEC_ID_AASC,
288 AV_CODEC_ID_INDEO2,
289 AV_CODEC_ID_FRAPS,
290 AV_CODEC_ID_TRUEMOTION2,
291 AV_CODEC_ID_BMP,
292 AV_CODEC_ID_CSCD,
293 AV_CODEC_ID_MMVIDEO,
294 AV_CODEC_ID_ZMBV,
295 AV_CODEC_ID_AVS,
296 AV_CODEC_ID_SMACKVIDEO,
297 AV_CODEC_ID_NUV,
298 AV_CODEC_ID_KMVC,
299 AV_CODEC_ID_FLASHSV,
300 AV_CODEC_ID_CAVS,
301 AV_CODEC_ID_JPEG2000,
302 AV_CODEC_ID_VMNC,
303 AV_CODEC_ID_VP5,
304 AV_CODEC_ID_VP6,
305 AV_CODEC_ID_VP6F,
306 AV_CODEC_ID_TARGA,
307 AV_CODEC_ID_DSICINVIDEO,
308 AV_CODEC_ID_TIERTEXSEQVIDEO,
309 AV_CODEC_ID_TIFF,
310 AV_CODEC_ID_GIF,
311 AV_CODEC_ID_DXA,
312 AV_CODEC_ID_DNXHD,
313 AV_CODEC_ID_THP,
314 AV_CODEC_ID_SGI,
315 AV_CODEC_ID_C93,
316 AV_CODEC_ID_BETHSOFTVID,
317 AV_CODEC_ID_PTX,
318 AV_CODEC_ID_TXD,
319 AV_CODEC_ID_VP6A,
320 AV_CODEC_ID_AMV,
321 AV_CODEC_ID_VB,
322 AV_CODEC_ID_PCX,
323 AV_CODEC_ID_SUNRAST,
324 AV_CODEC_ID_INDEO4,
325 AV_CODEC_ID_INDEO5,
326 AV_CODEC_ID_MIMIC,
327 AV_CODEC_ID_RL2,
328 AV_CODEC_ID_ESCAPE124,
329 AV_CODEC_ID_DIRAC,
330 AV_CODEC_ID_BFI,
331 AV_CODEC_ID_CMV,
332 AV_CODEC_ID_MOTIONPIXELS,
333 AV_CODEC_ID_TGV,
334 AV_CODEC_ID_TGQ,
335 AV_CODEC_ID_TQI,
336 AV_CODEC_ID_AURA,
337 AV_CODEC_ID_AURA2,
338 AV_CODEC_ID_V210X,
339 AV_CODEC_ID_TMV,
340 AV_CODEC_ID_V210,
341 AV_CODEC_ID_DPX,
342 AV_CODEC_ID_MAD,
343 AV_CODEC_ID_FRWU,
344 AV_CODEC_ID_FLASHSV2,
345 AV_CODEC_ID_CDGRAPHICS,
346 AV_CODEC_ID_R210,
347 AV_CODEC_ID_ANM,
348 AV_CODEC_ID_BINKVIDEO,
349 AV_CODEC_ID_IFF_ILBM,
350 AV_CODEC_ID_IFF_BYTERUN1,
351 AV_CODEC_ID_KGV1,
352 AV_CODEC_ID_YOP,
353 AV_CODEC_ID_VP8,
354 AV_CODEC_ID_PICTOR,
355 AV_CODEC_ID_ANSI,
356 AV_CODEC_ID_A64_MULTI,
357 AV_CODEC_ID_A64_MULTI5,
358 AV_CODEC_ID_R10K,
359 AV_CODEC_ID_MXPEG,
360 AV_CODEC_ID_LAGARITH,
361 AV_CODEC_ID_PRORES,
362 AV_CODEC_ID_JV,
363 AV_CODEC_ID_DFA,
364 AV_CODEC_ID_WMV3IMAGE,
365 AV_CODEC_ID_VC1IMAGE,
366 AV_CODEC_ID_UTVIDEO,
367 AV_CODEC_ID_BMV_VIDEO,
368 AV_CODEC_ID_VBLE,
369 AV_CODEC_ID_DXTORY,
370 AV_CODEC_ID_V410,
371 AV_CODEC_ID_XWD,
372 AV_CODEC_ID_CDXL,
373 AV_CODEC_ID_XBM,
374 AV_CODEC_ID_ZEROCODEC,
375 AV_CODEC_ID_MSS1,
376 AV_CODEC_ID_MSA1,
377 AV_CODEC_ID_TSCC2,
378 AV_CODEC_ID_MTS2,
379 AV_CODEC_ID_CLLC,
380 AV_CODEC_ID_MSS2,
381 AV_CODEC_ID_VP9,
382 AV_CODEC_ID_AIC,
383 AV_CODEC_ID_ESCAPE130,
384 AV_CODEC_ID_G2M,
385 AV_CODEC_ID_WEBP,
386 AV_CODEC_ID_HNM4_VIDEO,
387 AV_CODEC_ID_HEVC,
388 AV_CODEC_ID_FIC,
389 AV_CODEC_ID_ALIAS_PIX,
390 AV_CODEC_ID_BRENDER_PIX,
391 AV_CODEC_ID_PAF_VIDEO,
392 AV_CODEC_ID_EXR,
393 AV_CODEC_ID_VP7,
394 AV_CODEC_ID_SANM,
395 AV_CODEC_ID_SGIRLE,
396 AV_CODEC_ID_MVC1,
397 AV_CODEC_ID_MVC2,
398 AV_CODEC_ID_HQX,
399 AV_CODEC_ID_TDSC,
400 AV_CODEC_ID_HQ_HQA,
401 AV_CODEC_ID_HAP,
402 AV_CODEC_ID_DDS,
403 AV_CODEC_ID_DXV,
404 AV_CODEC_ID_SCREENPRESSO,
405 AV_CODEC_ID_RSCC,
406 AV_CODEC_ID_MAGICYUV,
407 AV_CODEC_ID_TRUEMOTION2RT,
408 AV_CODEC_ID_AV1,
409 AV_CODEC_ID_PIXLET,
410 AV_CODEC_ID_CFHD,
411 AV_CODEC_ID_FMVC,
412 AV_CODEC_ID_CLEARVIDEO,
413
414 /* various PCM "codecs" */
415 AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs
416 AV_CODEC_ID_PCM_S16LE = 0x10000,
417 AV_CODEC_ID_PCM_S16BE,
418 AV_CODEC_ID_PCM_U16LE,
419 AV_CODEC_ID_PCM_U16BE,
420 AV_CODEC_ID_PCM_S8,
421 AV_CODEC_ID_PCM_U8,
422 AV_CODEC_ID_PCM_MULAW,
423 AV_CODEC_ID_PCM_ALAW,
424 AV_CODEC_ID_PCM_S32LE,
425 AV_CODEC_ID_PCM_S32BE,
426 AV_CODEC_ID_PCM_U32LE,
427 AV_CODEC_ID_PCM_U32BE,
428 AV_CODEC_ID_PCM_S24LE,
429 AV_CODEC_ID_PCM_S24BE,
430 AV_CODEC_ID_PCM_U24LE,
431 AV_CODEC_ID_PCM_U24BE,
432 AV_CODEC_ID_PCM_S24DAUD,
433 AV_CODEC_ID_PCM_ZORK,
434 AV_CODEC_ID_PCM_S16LE_PLANAR,
435 AV_CODEC_ID_PCM_DVD,
436 AV_CODEC_ID_PCM_F32BE,
437 AV_CODEC_ID_PCM_F32LE,
438 AV_CODEC_ID_PCM_F64BE,
439 AV_CODEC_ID_PCM_F64LE,
440 AV_CODEC_ID_PCM_BLURAY,
441 AV_CODEC_ID_PCM_LXF,
442 AV_CODEC_ID_S302M,
443 AV_CODEC_ID_PCM_S8_PLANAR,
444 AV_CODEC_ID_PCM_S24LE_PLANAR,
445 AV_CODEC_ID_PCM_S32LE_PLANAR,
446 AV_CODEC_ID_PCM_S16BE_PLANAR,
447
448 /* various ADPCM codecs */
449 AV_CODEC_ID_ADPCM_IMA_QT = 0x11000,
450 AV_CODEC_ID_ADPCM_IMA_WAV,
451 AV_CODEC_ID_ADPCM_IMA_DK3,
452 AV_CODEC_ID_ADPCM_IMA_DK4,
453 AV_CODEC_ID_ADPCM_IMA_WS,
454 AV_CODEC_ID_ADPCM_IMA_SMJPEG,
455 AV_CODEC_ID_ADPCM_MS,
456 AV_CODEC_ID_ADPCM_4XM,
457 AV_CODEC_ID_ADPCM_XA,
458 AV_CODEC_ID_ADPCM_ADX,
459 AV_CODEC_ID_ADPCM_EA,
460 AV_CODEC_ID_ADPCM_G726,
461 AV_CODEC_ID_ADPCM_CT,
462 AV_CODEC_ID_ADPCM_SWF,
463 AV_CODEC_ID_ADPCM_YAMAHA,
464 AV_CODEC_ID_ADPCM_SBPRO_4,
465 AV_CODEC_ID_ADPCM_SBPRO_3,
466 AV_CODEC_ID_ADPCM_SBPRO_2,
467 AV_CODEC_ID_ADPCM_THP,
468 AV_CODEC_ID_ADPCM_IMA_AMV,
469 AV_CODEC_ID_ADPCM_EA_R1,
470 AV_CODEC_ID_ADPCM_EA_R3,
471 AV_CODEC_ID_ADPCM_EA_R2,
472 AV_CODEC_ID_ADPCM_IMA_EA_SEAD,
473 AV_CODEC_ID_ADPCM_IMA_EA_EACS,
474 AV_CODEC_ID_ADPCM_EA_XAS,
475 AV_CODEC_ID_ADPCM_EA_MAXIS_XA,
476 AV_CODEC_ID_ADPCM_IMA_ISS,
477 AV_CODEC_ID_ADPCM_G722,
478 AV_CODEC_ID_ADPCM_IMA_APC,
479 AV_CODEC_ID_ADPCM_VIMA,
480
481 /* AMR */
482 AV_CODEC_ID_AMR_NB = 0x12000,
483 AV_CODEC_ID_AMR_WB,
484
485 /* RealAudio codecs*/
486 AV_CODEC_ID_RA_144 = 0x13000,
487 AV_CODEC_ID_RA_288,
488
489 /* various DPCM codecs */
490 AV_CODEC_ID_ROQ_DPCM = 0x14000,
491 AV_CODEC_ID_INTERPLAY_DPCM,
492 AV_CODEC_ID_XAN_DPCM,
493 AV_CODEC_ID_SOL_DPCM,
494
495 /* audio codecs */
496 AV_CODEC_ID_MP2 = 0x15000,
497 AV_CODEC_ID_MP3, ///< preferred ID for decoding MPEG audio layer 1, 2 or 3
498 AV_CODEC_ID_AAC,
499 AV_CODEC_ID_AC3,
500 AV_CODEC_ID_DTS,
501 AV_CODEC_ID_VORBIS,
502 AV_CODEC_ID_DVAUDIO,
503 AV_CODEC_ID_WMAV1,
504 AV_CODEC_ID_WMAV2,
505 AV_CODEC_ID_MACE3,
506 AV_CODEC_ID_MACE6,
507 AV_CODEC_ID_VMDAUDIO,
508 AV_CODEC_ID_FLAC,
509 AV_CODEC_ID_MP3ADU,
510 AV_CODEC_ID_MP3ON4,
511 AV_CODEC_ID_SHORTEN,
512 AV_CODEC_ID_ALAC,
513 AV_CODEC_ID_WESTWOOD_SND1,
514 AV_CODEC_ID_GSM, ///< as in Berlin toast format
515 AV_CODEC_ID_QDM2,
516 AV_CODEC_ID_COOK,
517 AV_CODEC_ID_TRUESPEECH,
518 AV_CODEC_ID_TTA,
519 AV_CODEC_ID_SMACKAUDIO,
520 AV_CODEC_ID_QCELP,
521 AV_CODEC_ID_WAVPACK,
522 AV_CODEC_ID_DSICINAUDIO,
523 AV_CODEC_ID_IMC,
524 AV_CODEC_ID_MUSEPACK7,
525 AV_CODEC_ID_MLP,
526 AV_CODEC_ID_GSM_MS, /* as found in WAV */
527 AV_CODEC_ID_ATRAC3,
528 AV_CODEC_ID_APE,
529 AV_CODEC_ID_NELLYMOSER,
530 AV_CODEC_ID_MUSEPACK8,
531 AV_CODEC_ID_SPEEX,
532 AV_CODEC_ID_WMAVOICE,
533 AV_CODEC_ID_WMAPRO,
534 AV_CODEC_ID_WMALOSSLESS,
535 AV_CODEC_ID_ATRAC3P,
536 AV_CODEC_ID_EAC3,
537 AV_CODEC_ID_SIPR,
538 AV_CODEC_ID_MP1,
539 AV_CODEC_ID_TWINVQ,
540 AV_CODEC_ID_TRUEHD,
541 AV_CODEC_ID_MP4ALS,
542 AV_CODEC_ID_ATRAC1,
543 AV_CODEC_ID_BINKAUDIO_RDFT,
544 AV_CODEC_ID_BINKAUDIO_DCT,
545 AV_CODEC_ID_AAC_LATM,
546 AV_CODEC_ID_QDMC,
547 AV_CODEC_ID_CELT,
548 AV_CODEC_ID_G723_1,
549 AV_CODEC_ID_G729,
550 AV_CODEC_ID_8SVX_EXP,
551 AV_CODEC_ID_8SVX_FIB,
552 AV_CODEC_ID_BMV_AUDIO,
553 AV_CODEC_ID_RALF,
554 AV_CODEC_ID_IAC,
555 AV_CODEC_ID_ILBC,
556 AV_CODEC_ID_OPUS,
557 AV_CODEC_ID_COMFORT_NOISE,
558 AV_CODEC_ID_TAK,
559 AV_CODEC_ID_METASOUND,
560 AV_CODEC_ID_PAF_AUDIO,
561 AV_CODEC_ID_ON2AVC,
562 AV_CODEC_ID_DSS_SP,
563
564 /* subtitle codecs */
565 AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
566 AV_CODEC_ID_DVD_SUBTITLE = 0x17000,
567 AV_CODEC_ID_DVB_SUBTITLE,
568 AV_CODEC_ID_TEXT, ///< raw UTF-8 text
569 AV_CODEC_ID_XSUB,
570 AV_CODEC_ID_SSA,
571 AV_CODEC_ID_MOV_TEXT,
572 AV_CODEC_ID_HDMV_PGS_SUBTITLE,
573 AV_CODEC_ID_DVB_TELETEXT,
574 AV_CODEC_ID_SRT,
575
576 /* other specific kind of codecs (generally used for attachments) */
577 AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, ///< A dummy ID pointing at the start of various fake codecs.
578 AV_CODEC_ID_TTF = 0x18000,
579
580 AV_CODEC_ID_PROBE = 0x19000, ///< codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it
581
582 AV_CODEC_ID_MPEG2TS = 0x20000, /**< _FAKE_ codec to indicate a raw MPEG-2 TS
583 * stream (only used by libavformat) */
584 AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, /**< _FAKE_ codec to indicate a MPEG-4 Systems
585 * stream (only used by libavformat) */
586 AV_CODEC_ID_FFMETADATA = 0x21000, ///< Dummy codec for streams containing only metadata information.
587 AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, ///< Passthrough codec, AVFrames wrapped in AVPacket
588 };
589
590 /**
591 * This struct describes the properties of a single codec described by an
592 * AVCodecID.
593 * @see avcodec_descriptor_get()
594 */
595 typedef struct AVCodecDescriptor {
596 enum AVCodecID id;
597 enum AVMediaType type;
598 /**
599 * Name of the codec described by this descriptor. It is non-empty and
600 * unique for each codec descriptor. It should contain alphanumeric
601 * characters and '_' only.
602 */
603 const char *name;
604 /**
605 * A more descriptive name for this codec. May be NULL.
606 */
607 const char *long_name;
608 /**
609 * Codec properties, a combination of AV_CODEC_PROP_* flags.
610 */
611 int props;
612 /**
613 * If non-NULL, an array of profiles recognized for this codec.
614 * Terminated with FF_PROFILE_UNKNOWN.
615 */
616 const struct AVProfile *profiles;
617 } AVCodecDescriptor;
618
619 /**
620 * Codec uses only intra compression.
621 * Video codecs only.
622 */
623 #define AV_CODEC_PROP_INTRA_ONLY (1 << 0)
624 /**
625 * Codec supports lossy compression. Audio and video codecs only.
626 * @note a codec may support both lossy and lossless
627 * compression modes
628 */
629 #define AV_CODEC_PROP_LOSSY (1 << 1)
630 /**
631 * Codec supports lossless compression. Audio and video codecs only.
632 */
633 #define AV_CODEC_PROP_LOSSLESS (1 << 2)
634 /**
635 * Codec supports frame reordering. That is, the coded order (the order in which
636 * the encoded packets are output by the encoders / stored / input to the
637 * decoders) may be different from the presentation order of the corresponding
638 * frames.
639 *
640 * For codecs that do not have this property set, PTS and DTS should always be
641 * equal.
642 */
643 #define AV_CODEC_PROP_REORDER (1 << 3)
644
645 /**
646 * @ingroup lavc_decoding
647 * Required number of additionally allocated bytes at the end of the input bitstream for decoding.
648 * This is mainly needed because some optimized bitstream readers read
649 * 32 or 64 bit at once and could read over the end.<br>
650 * Note: If the first 23 bits of the additional bytes are not 0, then damaged
651 * MPEG bitstreams could cause overread and segfault.
652 */
653 #define AV_INPUT_BUFFER_PADDING_SIZE 8
654
655 /**
656 * @ingroup lavc_encoding
657 * minimum encoding buffer size
658 * Used to avoid some checks during header writing.
659 */
660 #define AV_INPUT_BUFFER_MIN_SIZE 16384
661
662 /**
663 * @ingroup lavc_decoding
664 */
665 enum AVDiscard{
666 /* We leave some space between them for extensions (drop some
667 * keyframes for intra-only or drop just some bidir frames). */
668 AVDISCARD_NONE =-16, ///< discard nothing
669 AVDISCARD_DEFAULT = 0, ///< discard useless packets like 0 size packets in avi
670 AVDISCARD_NONREF = 8, ///< discard all non reference
671 AVDISCARD_BIDIR = 16, ///< discard all bidirectional frames
672 AVDISCARD_NONKEY = 32, ///< discard all frames except keyframes
673 AVDISCARD_ALL = 48, ///< discard all
674 };
675
676 enum AVAudioServiceType {
677 AV_AUDIO_SERVICE_TYPE_MAIN = 0,
678 AV_AUDIO_SERVICE_TYPE_EFFECTS = 1,
679 AV_AUDIO_SERVICE_TYPE_VISUALLY_IMPAIRED = 2,
680 AV_AUDIO_SERVICE_TYPE_HEARING_IMPAIRED = 3,
681 AV_AUDIO_SERVICE_TYPE_DIALOGUE = 4,
682 AV_AUDIO_SERVICE_TYPE_COMMENTARY = 5,
683 AV_AUDIO_SERVICE_TYPE_EMERGENCY = 6,
684 AV_AUDIO_SERVICE_TYPE_VOICE_OVER = 7,
685 AV_AUDIO_SERVICE_TYPE_KARAOKE = 8,
686 AV_AUDIO_SERVICE_TYPE_NB , ///< Not part of ABI
687 };
688
689 /**
690 * @ingroup lavc_encoding
691 */
692 typedef struct RcOverride{
693 int start_frame;
694 int end_frame;
695 int qscale; // If this is 0 then quality_factor will be used instead.
696 float quality_factor;
697 } RcOverride;
698
699 /* encoding support
700 These flags can be passed in AVCodecContext.flags before initialization.
701 Note: Not everything is supported yet.
702 */
703
704 /**
705 * Allow decoders to produce frames with data planes that are not aligned
706 * to CPU requirements (e.g. due to cropping).
707 */
708 #define AV_CODEC_FLAG_UNALIGNED (1 << 0)
709 /**
710 * Use fixed qscale.
711 */
712 #define AV_CODEC_FLAG_QSCALE (1 << 1)
713 /**
714 * 4 MV per MB allowed / advanced prediction for H.263.
715 */
716 #define AV_CODEC_FLAG_4MV (1 << 2)
717 /**
718 * Output even those frames that might be corrupted.
719 */
720 #define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)
721 /**
722 * Use qpel MC.
723 */
724 #define AV_CODEC_FLAG_QPEL (1 << 4)
725 /**
726 * Use internal 2pass ratecontrol in first pass mode.
727 */
728 #define AV_CODEC_FLAG_PASS1 (1 << 9)
729 /**
730 * Use internal 2pass ratecontrol in second pass mode.
731 */
732 #define AV_CODEC_FLAG_PASS2 (1 << 10)
733 /**
734 * loop filter.
735 */
736 #define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)
737 /**
738 * Only decode/encode grayscale.
739 */
740 #define AV_CODEC_FLAG_GRAY (1 << 13)
741 /**
742 * error[?] variables will be set during encoding.
743 */
744 #define AV_CODEC_FLAG_PSNR (1 << 15)
745 /**
746 * Input bitstream might be truncated at a random location
747 * instead of only at frame boundaries.
748 */
749 #define AV_CODEC_FLAG_TRUNCATED (1 << 16)
750 /**
751 * Use interlaced DCT.
752 */
753 #define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)
754 /**
755 * Force low delay.
756 */
757 #define AV_CODEC_FLAG_LOW_DELAY (1 << 19)
758 /**
759 * Place global headers in extradata instead of every keyframe.
760 */
761 #define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)
762 /**
763 * Use only bitexact stuff (except (I)DCT).
764 */
765 #define AV_CODEC_FLAG_BITEXACT (1 << 23)
766 /* Fx : Flag for H.263+ extra options */
767 /**
768 * H.263 advanced intra coding / MPEG-4 AC prediction
769 */
770 #define AV_CODEC_FLAG_AC_PRED (1 << 24)
771 /**
772 * interlaced motion estimation
773 */
774 #define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)
775 #define AV_CODEC_FLAG_CLOSED_GOP (1 << 31)
776
777 /**
778 * Allow non spec compliant speedup tricks.
779 */
780 #define AV_CODEC_FLAG2_FAST (1 << 0)
781 /**
782 * Skip bitstream encoding.
783 */
784 #define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)
785 /**
786 * Place global headers at every keyframe instead of in extradata.
787 */
788 #define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)
789 /**
790 * Input bitstream might be truncated at a packet boundaries
791 * instead of only at frame boundaries.
792 */
793 #define AV_CODEC_FLAG2_CHUNKS (1 << 15)
794 /**
795 * Discard cropping information from SPS.
796 */
797 #define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)
798
799 /* Unsupported options :
800 * Syntax Arithmetic coding (SAC)
801 * Reference Picture Selection
802 * Independent Segment Decoding */
803 /* /Fx */
804 /* codec capabilities */
805
806 /**
807 * Decoder can use draw_horiz_band callback.
808 */
809 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0)
810 /**
811 * Codec uses get_buffer() for allocating buffers and supports custom allocators.
812 * If not set, it might not use get_buffer() at all or use operations that
813 * assume the buffer was allocated by avcodec_default_get_buffer.
814 */
815 #define AV_CODEC_CAP_DR1 (1 << 1)
816 #define AV_CODEC_CAP_TRUNCATED (1 << 3)
817 /**
818 * Encoder or decoder requires flushing with NULL input at the end in order to
819 * give the complete and correct output.
820 *
821 * NOTE: If this flag is not set, the codec is guaranteed to never be fed with
822 * with NULL data. The user can still send NULL data to the public encode
823 * or decode function, but libavcodec will not pass it along to the codec
824 * unless this flag is set.
825 *
826 * Decoders:
827 * The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL,
828 * avpkt->size=0 at the end to get the delayed data until the decoder no longer
829 * returns frames.
830 *
831 * Encoders:
832 * The encoder needs to be fed with NULL data at the end of encoding until the
833 * encoder no longer returns data.
834 *
835 * NOTE: For encoders implementing the AVCodec.encode2() function, setting this
836 * flag also means that the encoder must set the pts and duration for
837 * each output packet. If this flag is not set, the pts and duration will
838 * be determined by libavcodec from the input frame.
839 */
840 #define AV_CODEC_CAP_DELAY (1 << 5)
841 /**
842 * Codec can be fed a final frame with a smaller size.
843 * This can be used to prevent truncation of the last audio samples.
844 */
845 #define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)
846 /**
847 * Codec can output multiple frames per AVPacket
848 * Normally demuxers return one frame at a time, demuxers which do not do
849 * are connected to a parser to split what they return into proper frames.
850 * This flag is reserved to the very rare category of codecs which have a
851 * bitstream that cannot be split into frames without timeconsuming
852 * operations like full decoding. Demuxers carrying such bitstreams thus
853 * may return multiple frames in a packet. This has many disadvantages like
854 * prohibiting stream copy in many cases thus it should only be considered
855 * as a last resort.
856 */
857 #define AV_CODEC_CAP_SUBFRAMES (1 << 8)
858 /**
859 * Codec is experimental and is thus avoided in favor of non experimental
860 * encoders
861 */
862 #define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)
863 /**
864 * Codec should fill in channel configuration and samplerate instead of container
865 */
866 #define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)
867 /**
868 * Codec supports frame-level multithreading.
869 */
870 #define AV_CODEC_CAP_FRAME_THREADS (1 << 12)
871 /**
872 * Codec supports slice-based (or partition-based) multithreading.
873 */
874 #define AV_CODEC_CAP_SLICE_THREADS (1 << 13)
875 /**
876 * Codec supports changed parameters at any point.
877 */
878 #define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)
879 /**
880 * Codec supports avctx->thread_count == 0 (auto).
881 */
882 #define AV_CODEC_CAP_AUTO_THREADS (1 << 15)
883 /**
884 * Audio encoder supports receiving a different number of samples in each call.
885 */
886 #define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)
887
888 /**
889 * Pan Scan area.
890 * This specifies the area which should be displayed.
891 * Note there may be multiple such areas for one frame.
892 */
893 typedef struct AVPanScan{
894 /**
895 * id
896 * - encoding: Set by user.
897 * - decoding: Set by libavcodec.
898 */
899 int id;
900
901 /**
902 * width and height in 1/16 pel
903 * - encoding: Set by user.
904 * - decoding: Set by libavcodec.
905 */
906 int width;
907 int height;
908
909 /**
910 * position of the top left corner in 1/16 pel for up to 3 fields/frames
911 * - encoding: Set by user.
912 * - decoding: Set by libavcodec.
913 */
914 int16_t position[3][2];
915 }AVPanScan;
916
917 /**
918 * This structure describes the bitrate properties of an encoded bitstream. It
919 * roughly corresponds to a subset the VBV parameters for MPEG-2 or HRD
920 * parameters for H.264/HEVC.
921 */
922 typedef struct AVCPBProperties {
923 /**
924 * Maximum bitrate of the stream, in bits per second.
925 * Zero if unknown or unspecified.
926 */
927 int max_bitrate;
928 /**
929 * Minimum bitrate of the stream, in bits per second.
930 * Zero if unknown or unspecified.
931 */
932 int min_bitrate;
933 /**
934 * Average bitrate of the stream, in bits per second.
935 * Zero if unknown or unspecified.
936 */
937 int avg_bitrate;
938
939 /**
940 * The size of the buffer to which the ratecontrol is applied, in bits.
941 * Zero if unknown or unspecified.
942 */
943 int buffer_size;
944
945 /**
946 * The delay between the time the packet this structure is associated with
947 * is received and the time when it should be decoded, in periods of a 27MHz
948 * clock.
949 *
950 * UINT64_MAX when unknown or unspecified.
951 */
952 uint64_t vbv_delay;
953 } AVCPBProperties;
954
955 /**
956 * The decoder will keep a reference to the frame and may reuse it later.
957 */
958 #define AV_GET_BUFFER_FLAG_REF (1 << 0)
959
960 /**
961 * @defgroup lavc_packet AVPacket
962 *
963 * Types and functions for working with AVPacket.
964 * @{
965 */
966 enum AVPacketSideDataType {
967 /**
968 * An AV_PKT_DATA_PALETTE side data packet contains exactly AVPALETTE_SIZE
969 * bytes worth of palette. This side data signals that a new palette is
970 * present.
971 */
972 AV_PKT_DATA_PALETTE,
973
974 /**
975 * The AV_PKT_DATA_NEW_EXTRADATA is used to notify the codec or the format
976 * that the extradata buffer was changed and the receiving side should
977 * act upon it appropriately. The new extradata is embedded in the side
978 * data buffer and should be immediately used for processing the current
979 * frame or packet.
980 */
981 AV_PKT_DATA_NEW_EXTRADATA,
982
983 /**
984 * An AV_PKT_DATA_PARAM_CHANGE side data packet is laid out as follows:
985 * @code
986 * u32le param_flags
987 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT)
988 * s32le channel_count
989 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT)
990 * u64le channel_layout
991 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE)
992 * s32le sample_rate
993 * if (param_flags & AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS)
994 * s32le width
995 * s32le height
996 * @endcode
997 */
998 AV_PKT_DATA_PARAM_CHANGE,
999
1000 /**
1001 * An AV_PKT_DATA_H263_MB_INFO side data packet contains a number of
1002 * structures with info about macroblocks relevant to splitting the
1003 * packet into smaller packets on macroblock edges (e.g. as for RFC 2190).
1004 * That is, it does not necessarily contain info about all macroblocks,
1005 * as long as the distance between macroblocks in the info is smaller
1006 * than the target payload size.
1007 * Each MB info structure is 12 bytes, and is laid out as follows:
1008 * @code
1009 * u32le bit offset from the start of the packet
1010 * u8 current quantizer at the start of the macroblock
1011 * u8 GOB number
1012 * u16le macroblock address within the GOB
1013 * u8 horizontal MV predictor
1014 * u8 vertical MV predictor
1015 * u8 horizontal MV predictor for block number 3
1016 * u8 vertical MV predictor for block number 3
1017 * @endcode
1018 */
1019 AV_PKT_DATA_H263_MB_INFO,
1020
1021 /**
1022 * This side data should be associated with an audio stream and contains
1023 * ReplayGain information in form of the AVReplayGain struct.
1024 */
1025 AV_PKT_DATA_REPLAYGAIN,
1026
1027 /**
1028 * This side data contains a 3x3 transformation matrix describing an affine
1029 * transformation that needs to be applied to the decoded video frames for
1030 * correct presentation.
1031 *
1032 * See libavutil/display.h for a detailed description of the data.
1033 */
1034 AV_PKT_DATA_DISPLAYMATRIX,
1035
1036 /**
1037 * This side data should be associated with a video stream and contains
1038 * Stereoscopic 3D information in form of the AVStereo3D struct.
1039 */
1040 AV_PKT_DATA_STEREO3D,
1041
1042 /**
1043 * This side data should be associated with an audio stream and corresponds
1044 * to enum AVAudioServiceType.
1045 */
1046 AV_PKT_DATA_AUDIO_SERVICE_TYPE,
1047
1048 /**
1049 * This side data contains an integer value representing the quality
1050 * factor of the compressed frame. Allowed range is between 1 (good)
1051 * and FF_LAMBDA_MAX (bad).
1052 */
1053 AV_PKT_DATA_QUALITY_FACTOR,
1054
1055 /**
1056 * This side data contains an integer value representing the stream index
1057 * of a "fallback" track. A fallback track indicates an alternate
1058 * track to use when the current track can not be decoded for some reason.
1059 * e.g. no decoder available for codec.
1060 */
1061 AV_PKT_DATA_FALLBACK_TRACK,
1062
1063 /**
1064 * This side data corresponds to the AVCPBProperties struct.
1065 */
1066 AV_PKT_DATA_CPB_PROPERTIES,
1067
1068 /**
1069 * This side data should be associated with a video stream and corresponds
1070 * to the AVSphericalMapping structure.
1071 */
1072 AV_PKT_DATA_SPHERICAL,
1073 };
1074
1075 typedef struct AVPacketSideData {
1076 uint8_t *data;
1077 int size;
1078 enum AVPacketSideDataType type;
1079 } AVPacketSideData;
1080
1081 /**
1082 * This structure stores compressed data. It is typically exported by demuxers
1083 * and then passed as input to decoders, or received as output from encoders and
1084 * then passed to muxers.
1085 *
1086 * For video, it should typically contain one compressed frame. For audio it may
1087 * contain several compressed frames. Encoders are allowed to output empty
1088 * packets, with no compressed data, containing only side data
1089 * (e.g. to update some stream parameters at the end of encoding).
1090 *
1091 * AVPacket is one of the few structs in Libav, whose size is a part of public
1092 * ABI. Thus it may be allocated on stack and no new fields can be added to it
1093 * without libavcodec and libavformat major bump.
1094 *
1095 * The semantics of data ownership depends on the buf field.
1096 * If it is set, the packet data is dynamically allocated and is
1097 * valid indefinitely until a call to av_packet_unref() reduces the
1098 * reference count to 0.
1099 *
1100 * If the buf field is not set av_packet_ref() would make a copy instead
1101 * of increasing the reference count.
1102 *
1103 * The side data is always allocated with av_malloc(), copied by
1104 * av_packet_ref() and freed by av_packet_unref().
1105 *
1106 * @see av_packet_ref
1107 * @see av_packet_unref
1108 */
1109 typedef struct AVPacket {
1110 /**
1111 * A reference to the reference-counted buffer where the packet data is
1112 * stored.
1113 * May be NULL, then the packet data is not reference-counted.
1114 */
1115 AVBufferRef *buf;
1116 /**
1117 * Presentation timestamp in AVStream->time_base units; the time at which
1118 * the decompressed packet will be presented to the user.
1119 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1120 * pts MUST be larger or equal to dts as presentation cannot happen before
1121 * decompression, unless one wants to view hex dumps. Some formats misuse
1122 * the terms dts and pts/cts to mean something different. Such timestamps
1123 * must be converted to true pts/dts before they are stored in AVPacket.
1124 */
1125 int64_t pts;
1126 /**
1127 * Decompression timestamp in AVStream->time_base units; the time at which
1128 * the packet is decompressed.
1129 * Can be AV_NOPTS_VALUE if it is not stored in the file.
1130 */
1131 int64_t dts;
1132 uint8_t *data;
1133 int size;
1134 int stream_index;
1135 /**
1136 * A combination of AV_PKT_FLAG values
1137 */
1138 int flags;
1139 /**
1140 * Additional packet data that can be provided by the container.
1141 * Packet can contain several types of side information.
1142 */
1143 AVPacketSideData *side_data;
1144 int side_data_elems;
1145
1146 /**
1147 * Duration of this packet in AVStream->time_base units, 0 if unknown.
1148 * Equals next_pts - this_pts in presentation order.
1149 */
1150 int64_t duration;
1151
1152 int64_t pos; ///< byte position in stream, -1 if unknown
1153
1154 #if FF_API_CONVERGENCE_DURATION
1155 /**
1156 * @deprecated Same as the duration field, but as int64_t. This was required
1157 * for Matroska subtitles, whose duration values could overflow when the
1158 * duration field was still an int.
1159 */
1160 attribute_deprecated
1161 int64_t convergence_duration;
1162 #endif
1163 } AVPacket;
1164 #define AV_PKT_FLAG_KEY 0x0001 ///< The packet contains a keyframe
1165 #define AV_PKT_FLAG_CORRUPT 0x0002 ///< The packet content is corrupted
1166
1167 enum AVSideDataParamChangeFlags {
1168 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT = 0x0001,
1169 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
1170 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE = 0x0004,
1171 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS = 0x0008,
1172 };
1173 /**
1174 * @}
1175 */
1176
1177 struct AVCodecInternal;
1178
1179 enum AVFieldOrder {
1180 AV_FIELD_UNKNOWN,
1181 AV_FIELD_PROGRESSIVE,
1182 AV_FIELD_TT, //< Top coded_first, top displayed first
1183 AV_FIELD_BB, //< Bottom coded first, bottom displayed first
1184 AV_FIELD_TB, //< Top coded first, bottom displayed first
1185 AV_FIELD_BT, //< Bottom coded first, top displayed first
1186 };
1187
1188 /**
1189 * main external API structure.
1190 * New fields can be added to the end with minor version bumps.
1191 * Removal, reordering and changes to existing fields require a major
1192 * version bump.
1193 * sizeof(AVCodecContext) must not be used outside libav*.
1194 */
1195 typedef struct AVCodecContext {
1196 /**
1197 * information on struct for av_log
1198 * - set by avcodec_alloc_context3
1199 */
1200 const AVClass *av_class;
1201 int log_level_offset;
1202
1203 enum AVMediaType codec_type; /* see AVMEDIA_TYPE_xxx */
1204 const struct AVCodec *codec;
1205 enum AVCodecID codec_id; /* see AV_CODEC_ID_xxx */
1206
1207 /**
1208 * fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
1209 * This is used to work around some encoder bugs.
1210 * A demuxer should set this to what is stored in the field used to identify the codec.
1211 * If there are multiple such fields in a container then the demuxer should choose the one
1212 * which maximizes the information about the used codec.
1213 * If the codec tag field in a container is larger than 32 bits then the demuxer should
1214 * remap the longer ID to 32 bits with a table or other structure. Alternatively a new
1215 * extra_codec_tag + size could be added but for this a clear advantage must be demonstrated
1216 * first.
1217 * - encoding: Set by user, if not then the default based on codec_id will be used.
1218 * - decoding: Set by user, will be converted to uppercase by libavcodec during init.
1219 */
1220 unsigned int codec_tag;
1221
1222 void *priv_data;
1223
1224 /**
1225 * Private context used for internal data.
1226 *
1227 * Unlike priv_data, this is not codec-specific. It is used in general
1228 * libavcodec functions.
1229 */
1230 struct AVCodecInternal *internal;
1231
1232 /**
1233 * Private data of the user, can be used to carry app specific stuff.
1234 * - encoding: Set by user.
1235 * - decoding: Set by user.
1236 */
1237 void *opaque;
1238
1239 /**
1240 * the average bitrate
1241 * - encoding: Set by user; unused for constant quantizer encoding.
1242 * - decoding: Set by libavcodec. 0 or some bitrate if this info is available in the stream.
1243 */
1244 int bit_rate;
1245
1246 /**
1247 * number of bits the bitstream is allowed to diverge from the reference.
1248 * the reference can be CBR (for CBR pass1) or VBR (for pass2)
1249 * - encoding: Set by user; unused for constant quantizer encoding.
1250 * - decoding: unused
1251 */
1252 int bit_rate_tolerance;
1253
1254 /**
1255 * Global quality for codecs which cannot change it per frame.
1256 * This should be proportional to MPEG-1/2/4 qscale.
1257 * - encoding: Set by user.
1258 * - decoding: unused
1259 */
1260 int global_quality;
1261
1262 /**
1263 * - encoding: Set by user.
1264 * - decoding: unused
1265 */
1266 int compression_level;
1267 #define FF_COMPRESSION_DEFAULT -1
1268
1269 /**
1270 * AV_CODEC_FLAG_*.
1271 * - encoding: Set by user.
1272 * - decoding: Set by user.
1273 */
1274 int flags;
1275
1276 /**
1277 * AV_CODEC_FLAG2_*
1278 * - encoding: Set by user.
1279 * - decoding: Set by user.
1280 */
1281 int flags2;
1282
1283 /**
1284 * some codecs need / can use extradata like Huffman tables.
1285 * MJPEG: Huffman tables
1286 * rv10: additional flags
1287 * MPEG-4: global headers (they can be in the bitstream or here)
1288 * The allocated memory should be AV_INPUT_BUFFER_PADDING_SIZE bytes larger
1289 * than extradata_size to avoid problems if it is read with the bitstream reader.
1290 * The bytewise contents of extradata must not depend on the architecture or CPU endianness.
1291 * - encoding: Set/allocated/freed by libavcodec.
1292 * - decoding: Set/allocated/freed by user.
1293 */
1294 uint8_t *extradata;
1295 int extradata_size;
1296
1297 /**
1298 * This is the fundamental unit of time (in seconds) in terms
1299 * of which frame timestamps are represented. For fixed-fps content,
1300 * timebase should be 1/framerate and timestamp increments should be
1301 * identically 1.
1302 * - encoding: MUST be set by user.
1303 * - decoding: the use of this field for decoding is deprecated.
1304 * Use framerate instead.
1305 */
1306 AVRational time_base;
1307
1308 /**
1309 * For some codecs, the time base is closer to the field rate than the frame rate.
1310 * Most notably, H.264 and MPEG-2 specify time_base as half of frame duration
1311 * if no telecine is used ...
1312 *
1313 * Set to time_base ticks per frame. Default 1, e.g., H.264/MPEG-2 set it to 2.
1314 */
1315 int ticks_per_frame;
1316
1317 /**
1318 * Codec delay.
1319 *
1320 * Video:
1321 * Number of frames the decoded output will be delayed relative to the
1322 * encoded input.
1323 *
1324 * Audio:
1325 * For encoding, this field is unused (see initial_padding).
1326 *
1327 * For decoding, this is the number of samples the decoder needs to
1328 * output before the decoder's output is valid. When seeking, you should
1329 * start decoding this many samples prior to your desired seek point.
1330 *
1331 * - encoding: Set by libavcodec.
1332 * - decoding: Set by libavcodec.
1333 */
1334 int delay;
1335
1336
1337 /* video only */
1338 /**
1339 * picture width / height.
1340 *
1341 * @note Those fields may not match the values of the last
1342 * AVFrame output by avcodec_decode_video2 due frame
1343 * reordering.
1344 *
1345 * - encoding: MUST be set by user.
1346 * - decoding: May be set by the user before opening the decoder if known e.g.
1347 * from the container. Some decoders will require the dimensions
1348 * to be set by the caller. During decoding, the decoder may
1349 * overwrite those values as required while parsing the data.
1350 */
1351 int width, height;
1352
1353 /**
1354 * Bitstream width / height, may be different from width/height e.g. when
1355 * the decoded frame is cropped before being output.
1356 *
1357 * @note Those field may not match the value of the last
1358 * AVFrame output by avcodec_receive_frame() due frame
1359 * reordering.
1360 *
1361 * - encoding: unused
1362 * - decoding: May be set by the user before opening the decoder if known
1363 * e.g. from the container. During decoding, the decoder may
1364 * overwrite those values as required while parsing the data.
1365 */
1366 int coded_width, coded_height;
1367
1368 /**
1369 * the number of pictures in a group of pictures, or 0 for intra_only
1370 * - encoding: Set by user.
1371 * - decoding: unused
1372 */
1373 int gop_size;
1374
1375 /**
1376 * Pixel format, see AV_PIX_FMT_xxx.
1377 * May be set by the demuxer if known from headers.
1378 * May be overridden by the decoder if it knows better.
1379 *
1380 * @note This field may not match the value of the last
1381 * AVFrame output by avcodec_receive_frame() due frame
1382 * reordering.
1383 *
1384 * - encoding: Set by user.
1385 * - decoding: Set by user if known, overridden by libavcodec while
1386 * parsing the data.
1387 */
1388 enum AVPixelFormat pix_fmt;
1389
1390 /**
1391 * If non NULL, 'draw_horiz_band' is called by the libavcodec
1392 * decoder to draw a horizontal band. It improves cache usage. Not
1393 * all codecs can do that. You must check the codec capabilities
1394 * beforehand.
1395 * When multithreading is used, it may be called from multiple threads
1396 * at the same time; threads might draw different parts of the same AVFrame,
1397 * or multiple AVFrames, and there is no guarantee that slices will be drawn
1398 * in order.
1399 * The function is also used by hardware acceleration APIs.
1400 * It is called at least once during frame decoding to pass
1401 * the data needed for hardware render.
1402 * In that mode instead of pixel data, AVFrame points to
1403 * a structure specific to the acceleration API. The application
1404 * reads the structure and can change some fields to indicate progress
1405 * or mark state.
1406 * - encoding: unused
1407 * - decoding: Set by user.
1408 * @param height the height of the slice
1409 * @param y the y position of the slice
1410 * @param type 1->top field, 2->bottom field, 3->frame
1411 * @param offset offset into the AVFrame.data from which the slice should be read
1412 */
1413 void (*draw_horiz_band)(struct AVCodecContext *s,
1414 const AVFrame *src, int offset[AV_NUM_DATA_POINTERS],
1415 int y, int type, int height);
1416
1417 /**
1418 * callback to negotiate the pixelFormat
1419 * @param fmt is the list of formats which are supported by the codec,
1420 * it is terminated by -1 as 0 is a valid format, the formats are ordered by quality.
1421 * The first is always the native one.
1422 * @note The callback may be called again immediately if initialization for
1423 * the selected (hardware-accelerated) pixel format failed.
1424 * @warning Behavior is undefined if the callback returns a value not
1425 * in the fmt list of formats.
1426 * @return the chosen format
1427 * - encoding: unused
1428 * - decoding: Set by user, if not set the native format will be chosen.
1429 */
1430 enum AVPixelFormat (*get_format)(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
1431
1432 /**
1433 * maximum number of B-frames between non-B-frames
1434 * Note: The output will be delayed by max_b_frames+1 relative to the input.
1435 * - encoding: Set by user.
1436 * - decoding: unused
1437 */
1438 int max_b_frames;
1439
1440 /**
1441 * qscale factor between IP and B-frames
1442 * If > 0 then the last P-frame quantizer will be used (q= lastp_q*factor+offset).
1443 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1444 * - encoding: Set by user.
1445 * - decoding: unused
1446 */
1447 float b_quant_factor;
1448
1449 #if FF_API_PRIVATE_OPT
1450 /** @deprecated use encoder private options instead */
1451 attribute_deprecated
1452 int b_frame_strategy;
1453 #endif
1454
1455 /**
1456 * qscale offset between IP and B-frames
1457 * - encoding: Set by user.
1458 * - decoding: unused
1459 */
1460 float b_quant_offset;
1461
1462 /**
1463 * Size of the frame reordering buffer in the decoder.
1464 * For MPEG-2 it is 1 IPB or 0 low delay IP.
1465 * - encoding: Set by libavcodec.
1466 * - decoding: Set by libavcodec.
1467 */
1468 int has_b_frames;
1469
1470 #if FF_API_PRIVATE_OPT
1471 /** @deprecated use encoder private options instead */
1472 attribute_deprecated
1473 int mpeg_quant;
1474 #endif
1475
1476 /**
1477 * qscale factor between P- and I-frames
1478 * If > 0 then the last P-frame quantizer will be used (q = lastp_q * factor + offset).
1479 * If < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset).
1480 * - encoding: Set by user.
1481 * - decoding: unused
1482 */
1483 float i_quant_factor;
1484
1485 /**
1486 * qscale offset between P and I-frames
1487 * - encoding: Set by user.
1488 * - decoding: unused
1489 */
1490 float i_quant_offset;
1491
1492 /**
1493 * luminance masking (0-> disabled)
1494 * - encoding: Set by user.
1495 * - decoding: unused
1496 */
1497 float lumi_masking;
1498
1499 /**
1500 * temporary complexity masking (0-> disabled)
1501 * - encoding: Set by user.
1502 * - decoding: unused
1503 */
1504 float temporal_cplx_masking;
1505
1506 /**
1507 * spatial complexity masking (0-> disabled)
1508 * - encoding: Set by user.
1509 * - decoding: unused
1510 */
1511 float spatial_cplx_masking;
1512
1513 /**
1514 * p block masking (0-> disabled)
1515 * - encoding: Set by user.
1516 * - decoding: unused
1517 */
1518 float p_masking;
1519
1520 /**
1521 * darkness masking (0-> disabled)
1522 * - encoding: Set by user.
1523 * - decoding: unused
1524 */
1525 float dark_masking;
1526
1527 /**
1528 * slice count
1529 * - encoding: Set by libavcodec.
1530 * - decoding: Set by user (or 0).
1531 */
1532 int slice_count;
1533
1534 #if FF_API_PRIVATE_OPT
1535 /** @deprecated use encoder private options instead */
1536 attribute_deprecated
1537 int prediction_method;
1538 #define FF_PRED_LEFT 0
1539 #define FF_PRED_PLANE 1
1540 #define FF_PRED_MEDIAN 2
1541 #endif
1542
1543 /**
1544 * slice offsets in the frame in bytes
1545 * - encoding: Set/allocated by libavcodec.
1546 * - decoding: Set/allocated by user (or NULL).
1547 */
1548 int *slice_offset;
1549
1550 /**
1551 * sample aspect ratio (0 if unknown)
1552 * That is the width of a pixel divided by the height of the pixel.
1553 * Numerator and denominator must be relatively prime and smaller than 256 for some video standards.
1554 * - encoding: Set by user.
1555 * - decoding: Set by libavcodec.
1556 */
1557 AVRational sample_aspect_ratio;
1558
1559 /**
1560 * motion estimation comparison function
1561 * - encoding: Set by user.
1562 * - decoding: unused
1563 */
1564 int me_cmp;
1565 /**
1566 * subpixel motion estimation comparison function
1567 * - encoding: Set by user.
1568 * - decoding: unused
1569 */
1570 int me_sub_cmp;
1571 /**
1572 * macroblock comparison function (not supported yet)
1573 * - encoding: Set by user.
1574 * - decoding: unused
1575 */
1576 int mb_cmp;
1577 /**
1578 * interlaced DCT comparison function
1579 * - encoding: Set by user.
1580 * - decoding: unused
1581 */
1582 int ildct_cmp;
1583 #define FF_CMP_SAD 0
1584 #define FF_CMP_SSE 1
1585 #define FF_CMP_SATD 2
1586 #define FF_CMP_DCT 3
1587 #define FF_CMP_PSNR 4
1588 #define FF_CMP_BIT 5
1589 #define FF_CMP_RD 6
1590 #define FF_CMP_ZERO 7
1591 #define FF_CMP_VSAD 8
1592 #define FF_CMP_VSSE 9
1593 #define FF_CMP_NSSE 10
1594 #define FF_CMP_DCTMAX 13
1595 #define FF_CMP_DCT264 14
1596 #define FF_CMP_CHROMA 256
1597
1598 /**
1599 * ME diamond size & shape
1600 * - encoding: Set by user.
1601 * - decoding: unused
1602 */
1603 int dia_size;
1604
1605 /**
1606 * amount of previous MV predictors (2a+1 x 2a+1 square)
1607 * - encoding: Set by user.
1608 * - decoding: unused
1609 */
1610 int last_predictor_count;
1611
1612 #if FF_API_PRIVATE_OPT
1613 /** @deprecated use encoder private options instead */
1614 attribute_deprecated
1615 int pre_me;
1616 #endif
1617
1618 /**
1619 * motion estimation prepass comparison function
1620 * - encoding: Set by user.
1621 * - decoding: unused
1622 */
1623 int me_pre_cmp;
1624
1625 /**
1626 * ME prepass diamond size & shape
1627 * - encoding: Set by user.
1628 * - decoding: unused
1629 */
1630 int pre_dia_size;
1631
1632 /**
1633 * subpel ME quality
1634 * - encoding: Set by user.
1635 * - decoding: unused
1636 */
1637 int me_subpel_quality;
1638
1639 /**
1640 * maximum motion estimation search range in subpel units
1641 * If 0 then no limit.
1642 *
1643 * - encoding: Set by user.
1644 * - decoding: unused
1645 */
1646 int me_range;
1647
1648 /**
1649 * slice flags
1650 * - encoding: unused
1651 * - decoding: Set by user.
1652 */
1653 int slice_flags;
1654 #define SLICE_FLAG_CODED_ORDER 0x0001 ///< draw_horiz_band() is called in coded order instead of display
1655 #define SLICE_FLAG_ALLOW_FIELD 0x0002 ///< allow draw_horiz_band() with field slices (MPEG-2 field pics)
1656 #define SLICE_FLAG_ALLOW_PLANE 0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)
1657
1658 /**
1659 * macroblock decision mode
1660 * - encoding: Set by user.
1661 * - decoding: unused
1662 */
1663 int mb_decision;
1664 #define FF_MB_DECISION_SIMPLE 0 ///< uses mb_cmp
1665 #define FF_MB_DECISION_BITS 1 ///< chooses the one which needs the fewest bits
1666 #define FF_MB_DECISION_RD 2 ///< rate distortion
1667
1668 /**
1669 * custom intra quantization matrix
1670 * - encoding: Set by user, can be NULL.
1671 * - decoding: Set by libavcodec.
1672 */
1673 uint16_t *intra_matrix;
1674
1675 /**
1676 * custom inter quantization matrix
1677 * - encoding: Set by user, can be NULL.
1678 * - decoding: Set by libavcodec.
1679 */
1680 uint16_t *inter_matrix;
1681
1682 #if FF_API_PRIVATE_OPT
1683 /** @deprecated use encoder private options instead */
1684 attribute_deprecated
1685 int scenechange_threshold;
1686
1687 /** @deprecated use encoder private options instead */
1688 attribute_deprecated
1689 int noise_reduction;
1690 #endif
1691
1692 /**
1693 * precision of the intra DC coefficient - 8
1694 * - encoding: Set by user.
1695 * - decoding: unused
1696 */
1697 int intra_dc_precision;
1698
1699 /**
1700 * Number of macroblock rows at the top which are skipped.
1701 * - encoding: unused
1702 * - decoding: Set by user.
1703 */
1704 int skip_top;
1705
1706 /**
1707 * Number of macroblock rows at the bottom which are skipped.
1708 * - encoding: unused
1709 * - decoding: Set by user.
1710 */
1711 int skip_bottom;
1712
1713 /**
1714 * minimum MB Lagrange multiplier
1715 * - encoding: Set by user.
1716 * - decoding: unused
1717 */
1718 int mb_lmin;
1719
1720 /**
1721 * maximum MB Lagrange multiplier
1722 * - encoding: Set by user.
1723 * - decoding: unused
1724 */
1725 int mb_lmax;
1726
1727 #if FF_API_PRIVATE_OPT
1728 /**
1729 * @deprecated use encoder private options instead
1730 */
1731 attribute_deprecated
1732 int me_penalty_compensation;
1733 #endif
1734
1735 /**
1736 * - encoding: Set by user.
1737 * - decoding: unused
1738 */
1739 int bidir_refine;
1740
1741 #if FF_API_PRIVATE_OPT
1742 /** @deprecated use encoder private options instead */
1743 attribute_deprecated
1744 int brd_scale;
1745 #endif
1746
1747 /**
1748 * minimum GOP size
1749 * - encoding: Set by user.
1750 * - decoding: unused
1751 */
1752 int keyint_min;
1753
1754 /**
1755 * number of reference frames
1756 * - encoding: Set by user.
1757 * - decoding: Set by lavc.
1758 */
1759 int refs;
1760
1761 #if FF_API_PRIVATE_OPT
1762 /** @deprecated use encoder private options instead */
1763 attribute_deprecated
1764 int chromaoffset;
1765 #endif
1766
1767 /**
1768 * Note: Value depends upon the compare function used for fullpel ME.
1769 * - encoding: Set by user.
1770 * - decoding: unused
1771 */
1772 int mv0_threshold;
1773
1774 #if FF_API_PRIVATE_OPT
1775 /** @deprecated use encoder private options instead */
1776 attribute_deprecated
1777 int b_sensitivity;
1778 #endif
1779
1780 /**
1781 * Chromaticity coordinates of the source primaries.
1782 * - encoding: Set by user
1783 * - decoding: Set by libavcodec
1784 */
1785 enum AVColorPrimaries color_primaries;
1786
1787 /**
1788 * Color Transfer Characteristic.
1789 * - encoding: Set by user
1790 * - decoding: Set by libavcodec
1791 */
1792 enum AVColorTransferCharacteristic color_trc;
1793
1794 /**
1795 * YUV colorspace type.
1796 * - encoding: Set by user
1797 * - decoding: Set by libavcodec
1798 */
1799 enum AVColorSpace colorspace;
1800
1801 /**
1802 * MPEG vs JPEG YUV range.
1803 * - encoding: Set by user
1804 * - decoding: Set by libavcodec
1805 */
1806 enum AVColorRange color_range;
1807
1808 /**
1809 * This defines the location of chroma samples.
1810 * - encoding: Set by user
1811 * - decoding: Set by libavcodec
1812 */
1813 enum AVChromaLocation chroma_sample_location;
1814
1815 /**
1816 * Number of slices.
1817 * Indicates number of picture subdivisions. Used for parallelized
1818 * decoding.
1819 * - encoding: Set by user
1820 * - decoding: unused
1821 */
1822 int slices;
1823
1824 /** Field order
1825 * - encoding: set by libavcodec
1826 * - decoding: Set by libavcodec
1827 */
1828 enum AVFieldOrder field_order;
1829
1830 /* audio only */
1831 int sample_rate; ///< samples per second
1832 int channels; ///< number of audio channels
1833
1834 /**
1835 * audio sample format
1836 * - encoding: Set by user.
1837 * - decoding: Set by libavcodec.
1838 */
1839 enum AVSampleFormat sample_fmt; ///< sample format
1840
1841 /* The following data should not be initialized. */
1842 /**
1843 * Number of samples per channel in an audio frame.
1844 *
1845 * - encoding: set by libavcodec in avcodec_open2(). Each submitted frame
1846 * except the last must contain exactly frame_size samples per channel.
1847 * May be 0 when the codec has AV_CODEC_CAP_VARIABLE_FRAME_SIZE set, then the
1848 * frame size is not restricted.
1849 * - decoding: may be set by some decoders to indicate constant frame size
1850 */
1851 int frame_size;
1852
1853 /**
1854 * Frame counter, set by libavcodec.
1855 *
1856 * - decoding: total number of frames returned from the decoder so far.
1857 * - encoding: total number of frames passed to the encoder so far.
1858 *
1859 * @note the counter is not incremented if encoding/decoding resulted in
1860 * an error.
1861 */
1862 int frame_number;
1863
1864 /**
1865 * number of bytes per packet if constant and known or 0
1866 * Used by some WAV based audio codecs.
1867 */
1868 int block_align;
1869
1870 /**
1871 * Audio cutoff bandwidth (0 means "automatic")
1872 * - encoding: Set by user.
1873 * - decoding: unused
1874 */
1875 int cutoff;
1876
1877 /**
1878 * Audio channel layout.
1879 * - encoding: set by user.
1880 * - decoding: set by libavcodec.
1881 */
1882 uint64_t channel_layout;
1883
1884 /**
1885 * Request decoder to use this channel layout if it can (0 for default)
1886 * - encoding: unused
1887 * - decoding: Set by user.
1888 */
1889 uint64_t request_channel_layout;
1890
1891 /**
1892 * Type of service that the audio stream conveys.
1893 * - encoding: Set by user.
1894 * - decoding: Set by libavcodec.
1895 */
1896 enum AVAudioServiceType audio_service_type;
1897
1898 /**
1899 * Used to request a sample format from the decoder.
1900 * - encoding: unused.
1901 * - decoding: Set by user.
1902 */
1903 enum AVSampleFormat request_sample_fmt;
1904
1905 /**
1906 * This callback is called at the beginning of each frame to get data
1907 * buffer(s) for it. There may be one contiguous buffer for all the data or
1908 * there may be a buffer per each data plane or anything in between. What
1909 * this means is, you may set however many entries in buf[] you feel necessary.
1910 * Each buffer must be reference-counted using the AVBuffer API (see description
1911 * of buf[] below).
1912 *
1913 * The following fields will be set in the frame before this callback is
1914 * called:
1915 * - format
1916 * - width, height (video only)
1917 * - sample_rate, channel_layout, nb_samples (audio only)
1918 * Their values may differ from the corresponding values in
1919 * AVCodecContext. This callback must use the frame values, not the codec
1920 * context values, to calculate the required buffer size.
1921 *
1922 * This callback must fill the following fields in the frame:
1923 * - data[]
1924 * - linesize[]
1925 * - extended_data:
1926 * * if the data is planar audio with more than 8 channels, then this
1927 * callback must allocate and fill extended_data to contain all pointers
1928 * to all data planes. data[] must hold as many pointers as it can.
1929 * extended_data must be allocated with av_malloc() and will be freed in
1930 * av_frame_unref().
1931 * * otherwise extended_data must point to data
1932 * - buf[] must contain one or more pointers to AVBufferRef structures. Each of
1933 * the frame's data and extended_data pointers must be contained in these. That
1934 * is, one AVBufferRef for each allocated chunk of memory, not necessarily one
1935 * AVBufferRef per data[] entry. See: av_buffer_create(), av_buffer_alloc(),
1936 * and av_buffer_ref().
1937 * - extended_buf and nb_extended_buf must be allocated with av_malloc() by
1938 * this callback and filled with the extra buffers if there are more
1939 * buffers than buf[] can hold. extended_buf will be freed in
1940 * av_frame_unref().
1941 *
1942 * If AV_CODEC_CAP_DR1 is not set then get_buffer2() must call
1943 * avcodec_default_get_buffer2() instead of providing buffers allocated by
1944 * some other means.
1945 *
1946 * Each data plane must be aligned to the maximum required by the target
1947 * CPU.
1948 *
1949 * @see avcodec_default_get_buffer2()
1950 *
1951 * Video:
1952 *
1953 * If AV_GET_BUFFER_FLAG_REF is set in flags then the frame may be reused
1954 * (read and/or written to if it is writable) later by libavcodec.
1955 *
1956 * avcodec_align_dimensions2() should be used to find the required width and
1957 * height, as they normally need to be rounded up to the next multiple of 16.
1958 *
1959 * If frame multithreading is used and thread_safe_callbacks is set,
1960 * this callback may be called from a different thread, but not from more
1961 * than one at once. Does not need to be reentrant.
1962 *
1963 * @see avcodec_align_dimensions2()
1964 *
1965 * Audio:
1966 *
1967 * Decoders request a buffer of a particular size by setting
1968 * AVFrame.nb_samples prior to calling get_buffer2(). The decoder may,
1969 * however, utilize only part of the buffer by setting AVFrame.nb_samples
1970 * to a smaller value in the output frame.
1971 *
1972 * As a convenience, av_samples_get_buffer_size() and
1973 * av_samples_fill_arrays() in libavutil may be used by custom get_buffer2()
1974 * functions to find the required data size and to fill data pointers and
1975 * linesize. In AVFrame.linesize, only linesize[0] may be set for audio
1976 * since all planes must be the same size.
1977 *
1978 * @see av_samples_get_buffer_size(), av_samples_fill_arrays()
1979 *
1980 * - encoding: unused
1981 * - decoding: Set by libavcodec, user can override.
1982 */
1983 int (*get_buffer2)(struct AVCodecContext *s, AVFrame *frame, int flags);
1984
1985 /**
1986 * If non-zero, the decoded audio and video frames returned from
1987 * avcodec_decode_video2() and avcodec_decode_audio4() are reference-counted
1988 * and are valid indefinitely. The caller must free them with
1989 * av_frame_unref() when they are not needed anymore.
1990 * Otherwise, the decoded frames must not be freed by the caller and are
1991 * only valid until the next decode call.
1992 *
1993 * This is always automatically enabled if avcodec_receive_frame() is used.
1994 *
1995 * - encoding: unused
1996 * - decoding: set by the caller before avcodec_open2().
1997 */
1998 attribute_deprecated int refcounted_frames;
1999
2000 /* - encoding parameters */
2001 float qcompress; ///< amount of qscale change between easy & hard scenes (0.0-1.0)
2002 float qblur; ///< amount of qscale smoothing over time (0.0-1.0)
2003
2004 /**
2005 * minimum quantizer
2006 * - encoding: Set by user.
2007 * - decoding: unused
2008 */
2009 int qmin;
2010
2011 /**
2012 * maximum quantizer
2013 * - encoding: Set by user.
2014 * - decoding: unused
2015 */
2016 int qmax;
2017
2018 /**
2019 * maximum quantizer difference between frames
2020 * - encoding: Set by user.
2021 * - decoding: unused
2022 */
2023 int max_qdiff;
2024
2025 /**
2026 * decoder bitstream buffer size
2027 * - encoding: Set by user.
2028 * - decoding: unused
2029 */
2030 int rc_buffer_size;
2031
2032 /**
2033 * ratecontrol override, see RcOverride
2034 * - encoding: Allocated/set/freed by user.
2035 * - decoding: unused
2036 */
2037 int rc_override_count;
2038 RcOverride *rc_override;
2039
2040 /**
2041 * maximum bitrate
2042 * - encoding: Set by user.
2043 * - decoding: unused
2044 */
2045 int rc_max_rate;
2046
2047 /**
2048 * minimum bitrate
2049 * - encoding: Set by user.
2050 * - decoding: unused
2051 */
2052 int rc_min_rate;
2053
2054 /**
2055 * Ratecontrol attempt to use, at maximum, <value> of what can be used without an underflow.
2056 * - encoding: Set by user.
2057 * - decoding: unused.
2058 */
2059 float rc_max_available_vbv_use;
2060
2061 /**
2062 * Ratecontrol attempt to use, at least, <value> times the amount needed to prevent a vbv overflow.
2063 * - encoding: Set by user.
2064 * - decoding: unused.
2065 */
2066 float rc_min_vbv_overflow_use;
2067
2068 /**
2069 * Number of bits which should be loaded into the rc buffer before decoding starts.
2070 * - encoding: Set by user.
2071 * - decoding: unused
2072 */
2073 int rc_initial_buffer_occupancy;
2074
2075 #if FF_API_CODER_TYPE
2076 #define FF_CODER_TYPE_VLC 0
2077 #define FF_CODER_TYPE_AC 1
2078 #define FF_CODER_TYPE_RAW 2
2079 #define FF_CODER_TYPE_RLE 3
2080 /**
2081 * @deprecated use encoder private options instead
2082 */
2083 attribute_deprecated
2084 int coder_type;
2085 #endif /* FF_API_CODER_TYPE */
2086
2087 #if FF_API_PRIVATE_OPT
2088 /** @deprecated use encoder private options instead */
2089 attribute_deprecated
2090 int context_model;
2091 #endif
2092
2093 #if FF_API_PRIVATE_OPT
2094 /** @deprecated use encoder private options instead */
2095 attribute_deprecated
2096 int frame_skip_threshold;
2097
2098 /** @deprecated use encoder private options instead */
2099 attribute_deprecated
2100 int frame_skip_factor;
2101
2102 /** @deprecated use encoder private options instead */
2103 attribute_deprecated
2104 int frame_skip_exp;
2105
2106 /** @deprecated use encoder private options instead */
2107 attribute_deprecated
2108 int frame_skip_cmp;
2109 #endif /* FF_API_PRIVATE_OPT */
2110
2111 /**
2112 * trellis RD quantization
2113 * - encoding: Set by user.
2114 * - decoding: unused
2115 */
2116 int trellis;
2117
2118 #if FF_API_PRIVATE_OPT
2119 /** @deprecated use encoder private options instead */
2120 attribute_deprecated
2121 int min_prediction_order;
2122
2123 /** @deprecated use encoder private options instead */
2124 attribute_deprecated
2125 int max_prediction_order;
2126
2127 /** @deprecated use encoder private options instead */
2128 attribute_deprecated
2129 int64_t timecode_frame_start;
2130 #endif
2131
2132 #if FF_API_RTP_CALLBACK
2133 /**
2134 * @deprecated unused
2135 */
2136 /* The RTP callback: This function is called */
2137 /* every time the encoder has a packet to send. */
2138 /* It depends on the encoder if the data starts */
2139 /* with a Start Code (it should). H.263 does. */
2140 /* mb_nb contains the number of macroblocks */
2141 /* encoded in the RTP payload. */
2142 attribute_deprecated
2143 void (*rtp_callback)(struct AVCodecContext *avctx, void *data, int size, int mb_nb);
2144 #endif
2145
2146 #if FF_API_PRIVATE_OPT
2147 /** @deprecated use encoder private options instead */
2148 attribute_deprecated
2149 int rtp_payload_size; /* The size of the RTP payload: the coder will */
2150 /* do its best to deliver a chunk with size */
2151 /* below rtp_payload_size, the chunk will start */
2152 /* with a start code on some codecs like H.263. */
2153 /* This doesn't take account of any particular */
2154 /* headers inside the transmitted RTP payload. */
2155 #endif
2156
2157 #if FF_API_STAT_BITS
2158 /* statistics, used for 2-pass encoding */
2159 attribute_deprecated
2160 int mv_bits;
2161 attribute_deprecated
2162 int header_bits;
2163 attribute_deprecated
2164 int i_tex_bits;
2165 attribute_deprecated
2166 int p_tex_bits;
2167 attribute_deprecated
2168 int i_count;
2169 attribute_deprecated
2170 int p_count;
2171 attribute_deprecated
2172 int skip_count;
2173 attribute_deprecated
2174 int misc_bits;
2175
2176 /** @deprecated this field is unused */
2177 attribute_deprecated
2178 int frame_bits;
2179 #endif
2180
2181 /**
2182 * pass1 encoding statistics output buffer
2183 * - encoding: Set by libavcodec.
2184 * - decoding: unused
2185 */
2186 char *stats_out;
2187
2188 /**
2189 * pass2 encoding statistics input buffer
2190 * Concatenated stuff from stats_out of pass1 should be placed here.
2191 * - encoding: Allocated/set/freed by user.
2192 * - decoding: unused
2193 */
2194 char *stats_in;
2195
2196 /**
2197 * Work around bugs in encoders which sometimes cannot be detected automatically.
2198 * - encoding: Set by user
2199 * - decoding: Set by user
2200 */
2201 int workaround_bugs;
2202 #define FF_BUG_AUTODETECT 1 ///< autodetection
2203 #define FF_BUG_XVID_ILACE 4
2204 #define FF_BUG_UMP4 8
2205 #define FF_BUG_NO_PADDING 16
2206 #define FF_BUG_AMV 32
2207 #define FF_BUG_QPEL_CHROMA 64
2208 #define FF_BUG_STD_QPEL 128
2209 #define FF_BUG_QPEL_CHROMA2 256
2210 #define FF_BUG_DIRECT_BLOCKSIZE 512
2211 #define FF_BUG_EDGE 1024
2212 #define FF_BUG_HPEL_CHROMA 2048
2213 #define FF_BUG_DC_CLIP 4096
2214 #define FF_BUG_MS 8192 ///< Work around various bugs in Microsoft's broken decoders.
2215 #define FF_BUG_TRUNCATED 16384
2216
2217 /**
2218 * strictly follow the standard (MPEG-4, ...).
2219 * - encoding: Set by user.
2220 * - decoding: Set by user.
2221 * Setting this to STRICT or higher means the encoder and decoder will
2222 * generally do stupid things, whereas setting it to unofficial or lower
2223 * will mean the encoder might produce output that is not supported by all
2224 * spec-compliant decoders. Decoders don't differentiate between normal,
2225 * unofficial and experimental (that is, they always try to decode things
2226 * when they can) unless they are explicitly asked to behave stupidly
2227 * (=strictly conform to the specs)
2228 */
2229 int strict_std_compliance;
2230 #define FF_COMPLIANCE_VERY_STRICT 2 ///< Strictly conform to an older more strict version of the spec or reference software.
2231 #define FF_COMPLIANCE_STRICT 1 ///< Strictly conform to all the things in the spec no matter what consequences.
2232 #define FF_COMPLIANCE_NORMAL 0
2233 #define FF_COMPLIANCE_UNOFFICIAL -1 ///< Allow unofficial extensions
2234 #define FF_COMPLIANCE_EXPERIMENTAL -2 ///< Allow nonstandardized experimental things.
2235
2236 /**
2237 * error concealment flags
2238 * - encoding: unused
2239 * - decoding: Set by user.
2240 */
2241 int error_concealment;
2242 #define FF_EC_GUESS_MVS 1
2243 #define FF_EC_DEBLOCK 2
2244
2245 /**
2246 * debug
2247 * - encoding: Set by user.
2248 * - decoding: Set by user.
2249 */
2250 int debug;
2251 #define FF_DEBUG_PICT_INFO 1
2252 #define FF_DEBUG_RC 2
2253 #define FF_DEBUG_BITSTREAM 4
2254 #define FF_DEBUG_MB_TYPE 8
2255 #define FF_DEBUG_QP 16
2256 #define FF_DEBUG_DCT_COEFF 0x00000040
2257 #define FF_DEBUG_SKIP 0x00000080
2258 #define FF_DEBUG_STARTCODE 0x00000100
2259 #define FF_DEBUG_ER 0x00000400
2260 #define FF_DEBUG_MMCO 0x00000800
2261 #define FF_DEBUG_BUGS 0x00001000
2262 #define FF_DEBUG_BUFFERS 0x00008000
2263 #define FF_DEBUG_THREADS 0x00010000
2264
2265 /**
2266 * Error recognition; may misdetect some more or less valid parts as errors.
2267 * - encoding: unused
2268 * - decoding: Set by user.
2269 */
2270 int err_recognition;
2271
2272 /**
2273 * Verify checksums embedded in the bitstream (could be of either encoded or
2274 * decoded data, depending on the codec) and print an error message on mismatch.
2275 * If AV_EF_EXPLODE is also set, a mismatching checksum will result in the
2276 * decoder returning an error.
2277 */
2278 #define AV_EF_CRCCHECK (1<<0)
2279 #define AV_EF_BITSTREAM (1<<1)
2280 #define AV_EF_BUFFER (1<<2)
2281 #define AV_EF_EXPLODE (1<<3)
2282
2283 /**
2284 * opaque 64-bit number (generally a PTS) that will be reordered and
2285 * output in AVFrame.reordered_opaque
2286 * - encoding: unused
2287 * - decoding: Set by user.
2288 */
2289 int64_t reordered_opaque;
2290
2291 /**
2292 * Hardware accelerator in use
2293 * - encoding: unused.
2294 * - decoding: Set by libavcodec
2295 */
2296 struct AVHWAccel *hwaccel;
2297
2298 /**
2299 * Hardware accelerator context.
2300 * For some hardware accelerators, a global context needs to be
2301 * provided by the user. In that case, this holds display-dependent
2302 * data Libav cannot instantiate itself. Please refer to the
2303 * Libav HW accelerator documentation to know how to fill this
2304 * is. e.g. for VA API, this is a struct vaapi_context.
2305 * - encoding: unused
2306 * - decoding: Set by user
2307 */
2308 void *hwaccel_context;
2309
2310 /**
2311 * error
2312 * - encoding: Set by libavcodec if flags & AV_CODEC_FLAG_PSNR.
2313 * - decoding: unused
2314 */
2315 uint64_t error[AV_NUM_DATA_POINTERS];
2316
2317 /**
2318 * DCT algorithm, see FF_DCT_* below
2319 * - encoding: Set by user.
2320 * - decoding: unused
2321 */
2322 int dct_algo;
2323 #define FF_DCT_AUTO 0
2324 #define FF_DCT_FASTINT 1
2325 #define FF_DCT_INT 2
2326 #define FF_DCT_MMX 3
2327 #define FF_DCT_ALTIVEC 5
2328 #define FF_DCT_FAAN 6
2329
2330 /**
2331 * IDCT algorithm, see FF_IDCT_* below.
2332 * - encoding: Set by user.
2333 * - decoding: Set by user.
2334 */
2335 int idct_algo;
2336 #define FF_IDCT_AUTO 0
2337 #define FF_IDCT_INT 1
2338 #define FF_IDCT_SIMPLE 2
2339 #define FF_IDCT_SIMPLEMMX 3
2340 #define FF_IDCT_ARM 7
2341 #define FF_IDCT_ALTIVEC 8
2342 #define FF_IDCT_SIMPLEARM 10
2343 #define FF_IDCT_XVID 14
2344 #define FF_IDCT_SIMPLEARMV5TE 16
2345 #define FF_IDCT_SIMPLEARMV6 17
2346 #define FF_IDCT_FAAN 20
2347 #define FF_IDCT_SIMPLENEON 22
2348
2349 /**
2350 * bits per sample/pixel from the demuxer (needed for huffyuv).
2351 * - encoding: Set by libavcodec.
2352 * - decoding: Set by user.
2353 */
2354 int bits_per_coded_sample;
2355
2356 /**
2357 * Bits per sample/pixel of internal libavcodec pixel/sample format.
2358 * - encoding: set by user.
2359 * - decoding: set by libavcodec.
2360 */
2361 int bits_per_raw_sample;
2362
2363 #if FF_API_CODED_FRAME
2364 /**
2365 * the picture in the bitstream
2366 * - encoding: Set by libavcodec.
2367 * - decoding: unused
2368 *
2369 * @deprecated use the quality factor packet side data instead
2370 */
2371 attribute_deprecated AVFrame *coded_frame;
2372 #endif
2373
2374 /**
2375 * thread count
2376 * is used to decide how many independent tasks should be passed to execute()
2377 * - encoding: Set by user.
2378 * - decoding: Set by user.
2379 */
2380 int thread_count;
2381
2382 /**
2383 * Which multithreading methods to use.
2384 * Use of FF_THREAD_FRAME will increase decoding delay by one frame per thread,
2385 * so clients which cannot provide future frames should not use it.
2386 *
2387 * - encoding: Set by user, otherwise the default is used.
2388 * - decoding: Set by user, otherwise the default is used.
2389 */
2390 int thread_type;
2391 #define FF_THREAD_FRAME 1 ///< Decode more than one frame at once
2392 #define FF_THREAD_SLICE 2 ///< Decode more than one part of a single frame at once
2393
2394 /**
2395 * Which multithreading methods are in use by the codec.
2396 * - encoding: Set by libavcodec.
2397 * - decoding: Set by libavcodec.
2398 */
2399 int active_thread_type;
2400
2401 /**
2402 * Set by the client if its custom get_buffer() callback can be called
2403 * synchronously from another thread, which allows faster multithreaded decoding.
2404 * draw_horiz_band() will be called from other threads regardless of this setting.
2405 * Ignored if the default get_buffer() is used.
2406 * - encoding: Set by user.
2407 * - decoding: Set by user.
2408 */
2409 int thread_safe_callbacks;
2410
2411 /**
2412 * The codec may call this to execute several independent things.
2413 * It will return only after finishing all tasks.
2414 * The user may replace this with some multithreaded implementation,
2415 * the default implementation will execute the parts serially.
2416 * @param count the number of things to execute
2417 * - encoding: Set by libavcodec, user can override.
2418 * - decoding: Set by libavcodec, user can override.
2419 */
2420 int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void *arg2, int *ret, int count, int size);
2421
2422 /**
2423 * The codec may call this to execute several independent things.
2424 * It will return only after finishing all tasks.
2425 * The user may replace this with some multithreaded implementation,
2426 * the default implementation will execute the parts serially.
2427 * Also see avcodec_thread_init and e.g. the --enable-pthread configure option.
2428 * @param c context passed also to func
2429 * @param count the number of things to execute
2430 * @param arg2 argument passed unchanged to func
2431 * @param ret return values of executed functions, must have space for "count" values. May be NULL.
2432 * @param func function that will be called count times, with jobnr from 0 to count-1.
2433 * threadnr will be in the range 0 to c->thread_count-1 < MAX_THREADS and so that no
2434 * two instances of func executing at the same time will have the same threadnr.
2435 * @return always 0 currently, but code should handle a future improvement where when any call to func
2436 * returns < 0 no further calls to func may be done and < 0 is returned.
2437 * - encoding: Set by libavcodec, user can override.
2438 * - decoding: Set by libavcodec, user can override.
2439 */
2440 int (*execute2)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg, int jobnr, int threadnr), void *arg2, int *ret, int count);
2441
2442 /**
2443 * noise vs. sse weight for the nsse comparison function
2444 * - encoding: Set by user.
2445 * - decoding: unused
2446 */
2447 int nsse_weight;
2448
2449 /**
2450 * profile
2451 * - encoding: Set by user.
2452 * - decoding: Set by libavcodec.
2453 */
2454 int profile;
2455 #define FF_PROFILE_UNKNOWN -99
2456 #define FF_PROFILE_RESERVED -100
2457
2458 #define FF_PROFILE_AAC_MAIN 0
2459 #define FF_PROFILE_AAC_LOW 1
2460 #define FF_PROFILE_AAC_SSR 2
2461 #define FF_PROFILE_AAC_LTP 3
2462 #define FF_PROFILE_AAC_HE 4
2463 #define FF_PROFILE_AAC_HE_V2 28
2464 #define FF_PROFILE_AAC_LD 22
2465 #define FF_PROFILE_AAC_ELD 38
2466 #define FF_PROFILE_MPEG2_AAC_LOW 128
2467 #define FF_PROFILE_MPEG2_AAC_HE 131
2468
2469 #define FF_PROFILE_DTS 20
2470 #define FF_PROFILE_DTS_ES 30
2471 #define FF_PROFILE_DTS_96_24 40
2472 #define FF_PROFILE_DTS_HD_HRA 50
2473 #define FF_PROFILE_DTS_HD_MA 60
2474 #define FF_PROFILE_DTS_EXPRESS 70
2475
2476 #define FF_PROFILE_MPEG2_422 0
2477 #define FF_PROFILE_MPEG2_HIGH 1
2478 #define FF_PROFILE_MPEG2_SS 2
2479 #define FF_PROFILE_MPEG2_SNR_SCALABLE 3
2480 #define FF_PROFILE_MPEG2_MAIN 4
2481 #define FF_PROFILE_MPEG2_SIMPLE 5
2482
2483 #define FF_PROFILE_H264_CONSTRAINED (1<<9) // 8+1; constraint_set1_flag
2484 #define FF_PROFILE_H264_INTRA (1<<11) // 8+3; constraint_set3_flag
2485
2486 #define FF_PROFILE_H264_BASELINE 66
2487 #define FF_PROFILE_H264_CONSTRAINED_BASELINE (66|FF_PROFILE_H264_CONSTRAINED)
2488 #define FF_PROFILE_H264_MAIN 77
2489 #define FF_PROFILE_H264_EXTENDED 88
2490 #define FF_PROFILE_H264_HIGH 100
2491 #define FF_PROFILE_H264_HIGH_10 110
2492 #define FF_PROFILE_H264_HIGH_10_INTRA (110|FF_PROFILE_H264_INTRA)
2493 #define FF_PROFILE_H264_MULTIVIEW_HIGH 118
2494 #define FF_PROFILE_H264_HIGH_422 122
2495 #define FF_PROFILE_H264_HIGH_422_INTRA (122|FF_PROFILE_H264_INTRA)
2496 #define FF_PROFILE_H264_STEREO_HIGH 128
2497 #define FF_PROFILE_H264_HIGH_444 144
2498 #define FF_PROFILE_H264_HIGH_444_PREDICTIVE 244
2499 #define FF_PROFILE_H264_HIGH_444_INTRA (244|FF_PROFILE_H264_INTRA)
2500 #define FF_PROFILE_H264_CAVLC_444 44
2501
2502 #define FF_PROFILE_VC1_SIMPLE 0
2503 #define FF_PROFILE_VC1_MAIN 1
2504 #define FF_PROFILE_VC1_COMPLEX 2
2505 #define FF_PROFILE_VC1_ADVANCED 3
2506
2507 #define FF_PROFILE_MPEG4_SIMPLE 0
2508 #define FF_PROFILE_MPEG4_SIMPLE_SCALABLE 1
2509 #define FF_PROFILE_MPEG4_CORE 2
2510 #define FF_PROFILE_MPEG4_MAIN 3
2511 #define FF_PROFILE_MPEG4_N_BIT 4
2512 #define FF_PROFILE_MPEG4_SCALABLE_TEXTURE 5
2513 #define FF_PROFILE_MPEG4_SIMPLE_FACE_ANIMATION 6
2514 #define FF_PROFILE_MPEG4_BASIC_ANIMATED_TEXTURE 7
2515 #define FF_PROFILE_MPEG4_HYBRID 8
2516 #define FF_PROFILE_MPEG4_ADVANCED_REAL_TIME 9
2517 #define FF_PROFILE_MPEG4_CORE_SCALABLE 10
2518 #define FF_PROFILE_MPEG4_ADVANCED_CODING 11
2519 #define FF_PROFILE_MPEG4_ADVANCED_CORE 12
2520 #define FF_PROFILE_MPEG4_ADVANCED_SCALABLE_TEXTURE 13
2521 #define FF_PROFILE_MPEG4_SIMPLE_STUDIO 14
2522 #define FF_PROFILE_MPEG4_ADVANCED_SIMPLE 15
2523
2524 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0 1
2525 #define FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1 2
2526 #define FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION 32768
2527 #define FF_PROFILE_JPEG2000_DCINEMA_2K 3
2528 #define FF_PROFILE_JPEG2000_DCINEMA_4K 4
2529
2530 #define FF_PROFILE_VP9_0 0
2531 #define FF_PROFILE_VP9_1 1
2532 #define FF_PROFILE_VP9_2 2
2533 #define FF_PROFILE_VP9_3 3
2534
2535 #define FF_PROFILE_HEVC_MAIN 1
2536 #define FF_PROFILE_HEVC_MAIN_10 2
2537 #define FF_PROFILE_HEVC_MAIN_STILL_PICTURE 3
2538 #define FF_PROFILE_HEVC_REXT 4
2539
2540 /**
2541 * level
2542 * - encoding: Set by user.
2543 * - decoding: Set by libavcodec.
2544 */
2545 int level;
2546 #define FF_LEVEL_UNKNOWN -99
2547
2548 /**
2549 * - encoding: unused
2550 * - decoding: Set by user.
2551 */
2552 enum AVDiscard skip_loop_filter;
2553
2554 /**
2555 * - encoding: unused
2556 * - decoding: Set by user.
2557 */
2558 enum AVDiscard skip_idct;
2559
2560 /**
2561 * - encoding: unused
2562 * - decoding: Set by user.
2563 */
2564 enum AVDiscard skip_frame;
2565
2566 /**
2567 * Header containing style information for text subtitles.
2568 * For SUBTITLE_ASS subtitle type, it should contain the whole ASS
2569 * [Script Info] and [V4+ Styles] section, plus the [Events] line and
2570 * the Format line following. It shouldn't include any Dialogue line.
2571 * - encoding: Set/allocated/freed by user (before avcodec_open2())
2572 * - decoding: Set/allocated/freed by libavcodec (by avcodec_open2())
2573 */
2574 uint8_t *subtitle_header;
2575 int subtitle_header_size;
2576
2577 #if FF_API_VBV_DELAY
2578 /**
2579 * VBV delay coded in the last frame (in periods of a 27 MHz clock).
2580 * Used for compliant TS muxing.
2581 * - encoding: Set by libavcodec.
2582 * - decoding: unused.
2583 * @deprecated this value is now exported as a part of
2584 * AV_PKT_DATA_CPB_PROPERTIES packet side data
2585 */
2586 attribute_deprecated
2587 uint64_t vbv_delay;
2588 #endif
2589
2590 #if FF_API_SIDEDATA_ONLY_PKT
2591 /**
2592 * Encoding only and set by default. Allow encoders to output packets
2593 * that do not contain any encoded data, only side data.
2594 *
2595 * Some encoders need to output such packets, e.g. to update some stream
2596 * parameters at the end of encoding.
2597 *
2598 * @deprecated this field disables the default behaviour and
2599 * it is kept only for compatibility.
2600 */
2601 attribute_deprecated
2602 int side_data_only_packets;
2603 #endif
2604
2605 /**
2606 * Audio only. The number of "priming" samples (padding) inserted by the
2607 * encoder at the beginning of the audio. I.e. this number of leading
2608 * decoded samples must be discarded by the caller to get the original audio
2609 * without leading padding.
2610 *
2611 * - decoding: unused
2612 * - encoding: Set by libavcodec. The timestamps on the output packets are
2613 * adjusted by the encoder so that they always refer to the
2614 * first sample of the data actually contained in the packet,
2615 * including any added padding. E.g. if the timebase is
2616 * 1/samplerate and the timestamp of the first input sample is
2617 * 0, the timestamp of the first output packet will be
2618 * -initial_padding.
2619 */
2620 int initial_padding;
2621
2622 /*
2623 * - decoding: For codecs that store a framerate value in the compressed
2624 * bitstream, the decoder may export it here. { 0, 1} when
2625 * unknown.
2626 * - encoding: May be used to signal the framerate of CFR content to an
2627 * encoder.
2628 */
2629 AVRational framerate;
2630
2631 /**
2632 * Nominal unaccelerated pixel format, see AV_PIX_FMT_xxx.
2633 * - encoding: unused.
2634 * - decoding: Set by libavcodec before calling get_format()
2635 */
2636 enum AVPixelFormat sw_pix_fmt;
2637
2638 /**
2639 * Additional data associated with the entire coded stream.
2640 *
2641 * - decoding: unused
2642 * - encoding: may be set by libavcodec after avcodec_open2().
2643 */
2644 AVPacketSideData *coded_side_data;
2645 int nb_coded_side_data;
2646
2647 /**
2648 * A reference to the AVHWFramesContext describing the input (for encoding)
2649 * or output (decoding) frames. The reference is set by the caller and
2650 * afterwards owned (and freed) by libavcodec - it should never be read by
2651 * the caller after being set.
2652 *
2653 * - decoding: This field should be set by the caller from the get_format()
2654 * callback. The previous reference (if any) will always be
2655 * unreffed by libavcodec before the get_format() call.
2656 *
2657 * If the default get_buffer2() is used with a hwaccel pixel
2658 * format, then this AVHWFramesContext will be used for
2659 * allocating the frame buffers.
2660 *
2661 * - encoding: For hardware encoders configured to use a hwaccel pixel
2662 * format, this field should be set by the caller to a reference
2663 * to the AVHWFramesContext describing input frames.
2664 * AVHWFramesContext.format must be equal to
2665 * AVCodecContext.pix_fmt.
2666 *
2667 * This field should be set before avcodec_open2() is called.
2668 */
2669 AVBufferRef *hw_frames_ctx;
2670
2671 /**
2672 * Video decoding only. Certain video codecs support cropping, meaning that
2673 * only a sub-rectangle of the decoded frame is intended for display. This
2674 * option controls how cropping is handled by libavcodec.
2675 *
2676 * When set to 1 (the default), libavcodec will apply cropping internally.
2677 * I.e. it will modify the output frame width/height fields and offset the
2678 * data pointers (only by as much as possible while preserving alignment, or
2679 * by the full amount if the AV_CODEC_FLAG_UNALIGNED flag is set) so that
2680 * the frames output by the decoder refer only to the cropped area. The
2681 * crop_* fields of the output frames will be zero.
2682 *
2683 * When set to 0, the width/height fields of the output frames will be set
2684 * to the coded dimensions and the crop_* fields will describe the cropping
2685 * rectangle. Applying the cropping is left to the caller.
2686 *
2687 * @warning When hardware acceleration with opaque output frames is used,
2688 * libavcodec is unable to apply cropping from the top/left border.
2689 *
2690 * @note when this option is set to zero, the width/height fields of the
2691 * AVCodecContext and output AVFrames have different meanings. The codec
2692 * context fields store display dimensions (with the coded dimensions in
2693 * coded_width/height), while the frame fields store the coded dimensions
2694 * (with the display dimensions being determined by the crop_* fields).
2695 */
2696 int apply_cropping;
2697
2698 /**
2699 * A reference to the AVHWDeviceContext describing the device which will
2700 * be used by a hardware encoder/decoder. The reference is set by the
2701 * caller and afterwards owned (and freed) by libavcodec.
2702 *
2703 * This should be used if either the codec device does not require
2704 * hardware frames or any that are used are to be allocated internally by
2705 * libavcodec. If the user wishes to supply any of the frames used as
2706 * encoder input or decoder output then hw_frames_ctx should be used
2707 * instead. When hw_frames_ctx is set in get_format() for a decoder, this
2708 * field will be ignored while decoding the associated stream segment, but
2709 * may again be used on a following one after another get_format() call.
2710 *
2711 * For both encoders and decoders this field should be set before
2712 * avcodec_open2() is called and must not be written to thereafter.
2713 *
2714 * Note that some decoders may require this field to be set initially in
2715 * order to support hw_frames_ctx at all - in that case, all frames
2716 * contexts used must be created on the same device.
2717 */
2718 AVBufferRef *hw_device_ctx;
2719
2720 /**
2721 * Bit set of AV_HWACCEL_FLAG_* flags, which affect hardware accelerated
2722 * decoding (if active).
2723 * - encoding: unused
2724 * - decoding: Set by user (either before avcodec_open2(), or in the
2725 * AVCodecContext.get_format callback)
2726 */
2727 int hwaccel_flags;
2728 } AVCodecContext;
2729
2730 /**
2731 * AVProfile.
2732 */
2733 typedef struct AVProfile {
2734 int profile;
2735 const char *name; ///< short name for the profile
2736 } AVProfile;
2737
2738 typedef struct AVCodecDefault AVCodecDefault;
2739
2740 struct AVSubtitle;
2741
2742 /**
2743 * AVCodec.
2744 */
2745 typedef struct AVCodec {
2746 /**
2747 * Name of the codec implementation.
2748 * The name is globally unique among encoders and among decoders (but an
2749 * encoder and a decoder can share the same name).
2750 * This is the primary way to find a codec from the user perspective.
2751 */
2752 const char *name;
2753 /**
2754 * Descriptive name for the codec, meant to be more human readable than name.
2755 * You should use the NULL_IF_CONFIG_SMALL() macro to define it.
2756 */
2757 const char *long_name;
2758 enum AVMediaType type;
2759 enum AVCodecID id;
2760 /**
2761 * Codec capabilities.
2762 * see AV_CODEC_CAP_*
2763 */
2764 int capabilities;
2765 const AVRational *supported_framerates; ///< array of supported framerates, or NULL if any, array is terminated by {0,0}
2766 const enum AVPixelFormat *pix_fmts; ///< array of supported pixel formats, or NULL if unknown, array is terminated by -1
2767 const int *supported_samplerates; ///< array of supported audio samplerates, or NULL if unknown, array is terminated by 0
2768 const enum AVSampleFormat *sample_fmts; ///< array of supported sample formats, or NULL if unknown, array is terminated by -1
2769 const uint64_t *channel_layouts; ///< array of support channel layouts, or NULL if unknown. array is terminated by 0
2770 const AVClass *priv_class; ///< AVClass for the private context
2771 const AVProfile *profiles; ///< array of recognized profiles, or NULL if unknown, array is terminated by {FF_PROFILE_UNKNOWN}
2772
2773 /*****************************************************************
2774 * No fields below this line are part of the public API. They
2775 * may not be used outside of libavcodec and can be changed and
2776 * removed at will.
2777 * New public fields should be added right above.
2778 *****************************************************************
2779 */
2780 int priv_data_size;
2781 struct AVCodec *next;
2782 /**
2783 * @name Frame-level threading support functions
2784 * @{
2785 */
2786 /**
2787 * If defined, called on thread contexts when they are created.
2788 * If the codec allocates writable tables in init(), re-allocate them here.
2789 * priv_data will be set to a copy of the original.
2790 */
2791 int (*init_thread_copy)(AVCodecContext *);
2792 /**
2793 * Copy necessary context variables from a previous thread context to the current one.
2794 * If not defined, the next thread will start automatically; otherwise, the codec
2795 * must call ff_thread_finish_setup().
2796 *
2797 * dst and src will (rarely) point to the same context, in which case memcpy should be skipped.
2798 */
2799 int (*update_thread_context)(AVCodecContext *dst, const AVCodecContext *src);
2800 /** @} */
2801
2802 /**
2803 * Private codec-specific defaults.
2804 */
2805 const AVCodecDefault *defaults;
2806
2807 /**
2808 * Initialize codec static data, called from avcodec_register().
2809 */
2810 void (*init_static_data)(struct AVCodec *codec);
2811
2812 int (*init)(AVCodecContext *);
2813 int (*encode_sub)(AVCodecContext *, uint8_t *buf, int buf_size,
2814 const struct AVSubtitle *sub);
2815 /**
2816 * Encode data to an AVPacket.
2817 *
2818 * @param avctx codec context
2819 * @param avpkt output AVPacket (may contain a user-provided buffer)
2820 * @param[in] frame AVFrame containing the raw data to be encoded
2821 * @param[out] got_packet_ptr encoder sets to 0 or 1 to indicate that a
2822 * non-empty packet was returned in avpkt.
2823 * @return 0 on success, negative error code on failure
2824 */
2825 int (*encode2)(AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame,
2826 int *got_packet_ptr);
2827 int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, AVPacket *avpkt);
2828 int (*close)(AVCodecContext *);
2829 /**
2830 * Encode API with decoupled packet/frame dataflow. The API is the
2831 * same as the avcodec_ prefixed APIs (avcodec_send_frame() etc.), except
2832 * that:
2833 * - never called if the codec is closed or the wrong type,
2834 * - if AV_CODEC_CAP_DELAY is not set, drain frames are never sent,
2835 * - only one drain frame is ever passed down,
2836 */
2837 int (*send_frame)(AVCodecContext *avctx, const AVFrame *frame);
2838 int (*receive_packet)(AVCodecContext *avctx, AVPacket *avpkt);
2839
2840 /**
2841 * Decode API with decoupled packet/frame dataflow. This function is called
2842 * to get one output frame. It should call ff_decode_get_packet() to obtain
2843 * input data.
2844 */
2845 int (*receive_frame)(AVCodecContext *avctx, AVFrame *frame);
2846 /**
2847 * Flush buffers.
2848 * Will be called when seeking
2849 */
2850 void (*flush)(AVCodecContext *);
2851 /**
2852 * Internal codec capabilities.
2853 * See FF_CODEC_CAP_* in internal.h
2854 */
2855 int caps_internal;
2856
2857 /**
2858 * Decoding only, a comma-separated list of bitstream filters to apply to
2859 * packets before decoding.
2860 */
2861 const char *bsfs;
2862 } AVCodec;
2863
2864 /**
2865 * @defgroup lavc_hwaccel AVHWAccel
2866 * @{
2867 */
2868 typedef struct AVHWAccel {
2869 /**
2870 * Name of the hardware accelerated codec.
2871 * The name is globally unique among encoders and among decoders (but an
2872 * encoder and a decoder can share the same name).
2873 */
2874 const char *name;
2875
2876 /**
2877 * Type of codec implemented by the hardware accelerator.
2878 *
2879 * See AVMEDIA_TYPE_xxx
2880 */
2881 enum AVMediaType type;
2882
2883 /**
2884 * Codec implemented by the hardware accelerator.
2885 *
2886 * See AV_CODEC_ID_xxx
2887 */
2888 enum AVCodecID id;
2889
2890 /**
2891 * Supported pixel format.
2892 *
2893 * Only hardware accelerated formats are supported here.
2894 */
2895 enum AVPixelFormat pix_fmt;
2896
2897 /**
2898 * Hardware accelerated codec capabilities.
2899 * see FF_HWACCEL_CODEC_CAP_*
2900 */
2901 int capabilities;
2902
2903 /*****************************************************************
2904 * No fields below this line are part of the public API. They
2905 * may not be used outside of libavcodec and can be changed and
2906 * removed at will.
2907 * New public fields should be added right above.
2908 *****************************************************************
2909 */
2910 struct AVHWAccel *next;
2911
2912 /**
2913 * Allocate a custom buffer
2914 */
2915 int (*alloc_frame)(AVCodecContext *avctx, AVFrame *frame);
2916
2917 /**
2918 * Called at the beginning of each frame or field picture.
2919 *
2920 * Meaningful frame information (codec specific) is guaranteed to
2921 * be parsed at this point. This function is mandatory.
2922 *
2923 * Note that buf can be NULL along with buf_size set to 0.
2924 * Otherwise, this means the whole frame is available at this point.
2925 *
2926 * @param avctx the codec context
2927 * @param buf the frame data buffer base
2928 * @param buf_size the size of the frame in bytes
2929 * @return zero if successful, a negative value otherwise
2930 */
2931 int (*start_frame)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2932
2933 /**
2934 * Callback for each slice.
2935 *
2936 * Meaningful slice information (codec specific) is guaranteed to
2937 * be parsed at this point. This function is mandatory.
2938 *
2939 * @param avctx the codec context
2940 * @param buf the slice data buffer base
2941 * @param buf_size the size of the slice in bytes
2942 * @return zero if successful, a negative value otherwise
2943 */
2944 int (*decode_slice)(AVCodecContext *avctx, const uint8_t *buf, uint32_t buf_size);
2945
2946 /**
2947 * Called at the end of each frame or field picture.
2948 *
2949 * The whole picture is parsed at this point and can now be sent
2950 * to the hardware accelerator. This function is mandatory.
2951 *
2952 * @param avctx the codec context
2953 * @return zero if successful, a negative value otherwise
2954 */
2955 int (*end_frame)(AVCodecContext *avctx);
2956
2957 /**
2958 * Size of per-frame hardware accelerator private data.
2959 *
2960 * Private data is allocated with av_mallocz() before
2961 * AVCodecContext.get_buffer() and deallocated after
2962 * AVCodecContext.release_buffer().
2963 */
2964 int frame_priv_data_size;
2965
2966 /**
2967 * Initialize the hwaccel private data.
2968 *
2969 * This will be called from ff_get_format(), after hwaccel and
2970 * hwaccel_context are set and the hwaccel private data in AVCodecInternal
2971 * is allocated.
2972 */
2973 int (*init)(AVCodecContext *avctx);
2974
2975 /**
2976 * Uninitialize the hwaccel private data.
2977 *
2978 * This will be called from get_format() or avcodec_close(), after hwaccel
2979 * and hwaccel_context are already uninitialized.
2980 */
2981 int (*uninit)(AVCodecContext *avctx);
2982
2983 /**
2984 * Size of the private data to allocate in
2985 * AVCodecInternal.hwaccel_priv_data.
2986 */
2987 int priv_data_size;
2988
2989 /**
2990 * Internal hwaccel capabilities.
2991 */
2992 int caps_internal;
2993 } AVHWAccel;
2994
2995 /**
2996 * Hardware acceleration should be used for decoding even if the codec level
2997 * used is unknown or higher than the maximum supported level reported by the
2998 * hardware driver.
2999 */
3000 #define AV_HWACCEL_FLAG_IGNORE_LEVEL (1 << 0)
3001
3002 /**
3003 * Hardware acceleration can output YUV pixel formats with a different chroma
3004 * sampling than 4:2:0 and/or other than 8 bits per component.
3005 */
3006 #define AV_HWACCEL_FLAG_ALLOW_HIGH_DEPTH (1 << 1)
3007
3008 /**
3009 * @}
3010 */
3011
3012 #if FF_API_AVPICTURE
3013 /**
3014 * @defgroup lavc_picture AVPicture
3015 *
3016 * Functions for working with AVPicture
3017 * @{
3018 */
3019
3020 /**
3021 * four components are given, that's all.
3022 * the last component is alpha
3023 * @deprecated Use the imgutils functions
3024 */
3025 typedef struct AVPicture {
3026 attribute_deprecated
3027 uint8_t *data[AV_NUM_DATA_POINTERS];
3028 attribute_deprecated
3029 int linesize[AV_NUM_DATA_POINTERS]; ///< number of bytes per line
3030 } AVPicture;
3031
3032 /**
3033 * @}
3034 */
3035 #endif
3036
3037 #define AVPALETTE_SIZE 1024
3038 #define AVPALETTE_COUNT 256
3039
3040 enum AVSubtitleType {
3041 SUBTITLE_NONE,
3042
3043 SUBTITLE_BITMAP, ///< A bitmap, pict will be set
3044
3045 /**
3046 * Plain text, the text field must be set by the decoder and is
3047 * authoritative. ass and pict fields may contain approximations.
3048 */
3049 SUBTITLE_TEXT,
3050
3051 /**
3052 * Formatted text, the ass field must be set by the decoder and is
3053 * authoritative. pict and text fields may contain approximations.
3054 */
3055 SUBTITLE_ASS,
3056 };
3057
3058 #define AV_SUBTITLE_FLAG_FORCED 0x00000001
3059
3060 typedef struct AVSubtitleRect {
3061 int x; ///< top left corner of pict, undefined when pict is not set
3062 int y; ///< top left corner of pict, undefined when pict is not set
3063 int w; ///< width of pict, undefined when pict is not set
3064 int h; ///< height of pict, undefined when pict is not set
3065 int nb_colors; ///< number of colors in pict, undefined when pict is not set
3066
3067 #if FF_API_AVPICTURE
3068 /**
3069 * @deprecated unused
3070 */
3071 attribute_deprecated
3072 AVPicture pict;
3073 #endif
3074 /**
3075 * data+linesize for the bitmap of this subtitle.
3076 * Can be set for text/ass as well once they are rendered.
3077 */
3078 uint8_t *data[4];
3079 int linesize[4];
3080
3081 enum AVSubtitleType type;
3082
3083 char *text; ///< 0 terminated plain UTF-8 text
3084
3085 /**
3086 * 0 terminated ASS/SSA compatible event line.
3087 * The presentation of this is unaffected by the other values in this
3088 * struct.
3089 */
3090 char *ass;
3091 int flags;
3092 } AVSubtitleRect;
3093
3094 typedef struct AVSubtitle {
3095 uint16_t format; /* 0 = graphics */
3096 uint32_t start_display_time; /* relative to packet pts, in ms */
3097 uint32_t end_display_time; /* relative to packet pts, in ms */
3098 unsigned num_rects;
3099 AVSubtitleRect **rects;
3100 int64_t pts; ///< Same as packet pts, in AV_TIME_BASE
3101 } AVSubtitle;
3102
3103 /**
3104 * This struct describes the properties of an encoded stream.
3105 *
3106 * sizeof(AVCodecParameters) is not a part of the public ABI, this struct must
3107 * be allocated with avcodec_parameters_alloc() and freed with
3108 * avcodec_parameters_free().
3109 */
3110 typedef struct AVCodecParameters {
3111 /**
3112 * General type of the encoded data.
3113 */
3114 enum AVMediaType codec_type;
3115 /**
3116 * Specific type of the encoded data (the codec used).
3117 */
3118 enum AVCodecID codec_id;
3119 /**
3120 * Additional information about the codec (corresponds to the AVI FOURCC).
3121 */
3122 uint32_t codec_tag;
3123
3124 /**
3125 * Extra binary data needed for initializing the decoder, codec-dependent.
3126 *
3127 * Must be allocated with av_malloc() and will be freed by
3128 * avcodec_parameters_free(). The allocated size of extradata must be at
3129 * least extradata_size + AV_INPUT_BUFFER_PADDING_SIZE, with the padding
3130 * bytes zeroed.
3131 */
3132 uint8_t *extradata;
3133 /**
3134 * Size of the extradata content in bytes.
3135 */
3136 int extradata_size;
3137
3138 /**
3139 * - video: the pixel format, the value corresponds to enum AVPixelFormat.
3140 * - audio: the sample format, the value corresponds to enum AVSampleFormat.
3141 */
3142 int format;
3143
3144 /**
3145 * The average bitrate of the encoded data (in bits per second).
3146 */
3147 int bit_rate;
3148
3149 int bits_per_coded_sample;
3150
3151 /**
3152 * Codec-specific bitstream restrictions that the stream conforms to.
3153 */
3154 int profile;
3155 int level;
3156
3157 /**
3158 * Video only. The dimensions of the video frame in pixels.
3159 */
3160 int width;
3161 int height;
3162
3163 /**
3164 * Video only. The aspect ratio (width / height) which a single pixel
3165 * should have when displayed.
3166 *
3167 * When the aspect ratio is unknown / undefined, the numerator should be
3168 * set to 0 (the denominator may have any value).
3169 */
3170 AVRational sample_aspect_ratio;
3171
3172 /**
3173 * Video only. The order of the fields in interlaced video.
3174 */
3175 enum AVFieldOrder field_order;
3176
3177 /**
3178 * Video only. Additional colorspace characteristics.
3179 */
3180 enum AVColorRange color_range;
3181 enum AVColorPrimaries color_primaries;
3182 enum AVColorTransferCharacteristic color_trc;
3183 enum AVColorSpace color_space;
3184 enum AVChromaLocation chroma_location;
3185
3186 /**
3187 * Audio only. The channel layout bitmask. May be 0 if the channel layout is
3188 * unknown or unspecified, otherwise the number of bits set must be equal to
3189 * the channels field.
3190 */
3191 uint64_t channel_layout;
3192 /**
3193 * Audio only. The number of audio channels.
3194 */
3195 int channels;
3196 /**
3197 * Audio only. The number of audio samples per second.
3198 */
3199 int sample_rate;
3200 /**
3201 * Audio only. The number of bytes per coded audio frame, required by some
3202 * formats.
3203 *
3204 * Corresponds to nBlockAlign in WAVEFORMATEX.
3205 */
3206 int block_align;
3207
3208 /**
3209 * Audio only. The amount of padding (in samples) inserted by the encoder at
3210 * the beginning of the audio. I.e. this number of leading decoded samples
3211 * must be discarded by the caller to get the original audio without leading
3212 * padding.
3213 */
3214 int initial_padding;
3215 /**
3216 * Audio only. The amount of padding (in samples) appended by the encoder to
3217 * the end of the audio. I.e. this number of decoded samples must be
3218 * discarded by the caller from the end of the stream to get the original
3219 * audio without any trailing padding.
3220 */
3221 int trailing_padding;
3222 } AVCodecParameters;
3223
3224 /**
3225 * If c is NULL, returns the first registered codec,
3226 * if c is non-NULL, returns the next registered codec after c,
3227 * or NULL if c is the last one.
3228 */
3229 AVCodec *av_codec_next(const AVCodec *c);
3230
3231 /**
3232 * Return the LIBAVCODEC_VERSION_INT constant.
3233 */
3234 unsigned avcodec_version(void);
3235
3236 /**
3237 * Return the libavcodec build-time configuration.
3238 */
3239 const char *avcodec_configuration(void);
3240
3241 /**
3242 * Return the libavcodec license.
3243 */
3244 const char *avcodec_license(void);
3245
3246 /**
3247 * Register the codec codec and initialize libavcodec.
3248 *
3249 * @warning either this function or avcodec_register_all() must be called
3250 * before any other libavcodec functions.
3251 *
3252 * @see avcodec_register_all()
3253 */
3254 void avcodec_register(AVCodec *codec);
3255
3256 /**
3257 * Register all the codecs, parsers and bitstream filters which were enabled at
3258 * configuration time. If you do not call this function you can select exactly
3259 * which formats you want to support, by using the individual registration
3260 * functions.
3261 *
3262 * @see avcodec_register
3263 * @see av_register_codec_parser
3264 * @see av_register_bitstream_filter
3265 */
3266 void avcodec_register_all(void);
3267
3268 /**
3269 * Allocate an AVCodecContext and set its fields to default values. The
3270 * resulting struct should be freed with avcodec_free_context().
3271 *
3272 * @param codec if non-NULL, allocate private data and initialize defaults
3273 * for the given codec. It is illegal to then call avcodec_open2()
3274 * with a different codec.
3275 * If NULL, then the codec-specific defaults won't be initialized,
3276 * which may result in suboptimal default settings (this is
3277 * important mainly for encoders, e.g. libx264).
3278 *
3279 * @return An AVCodecContext filled with default values or NULL on failure.
3280 */
3281 AVCodecContext *avcodec_alloc_context3(const AVCodec *codec);
3282
3283 /**
3284 * Free the codec context and everything associated with it and write NULL to
3285 * the provided pointer.
3286 */
3287 void avcodec_free_context(AVCodecContext **avctx);
3288
3289 #if FF_API_GET_CONTEXT_DEFAULTS
3290 /**
3291 * @deprecated This function should not be used, as closing and opening a codec
3292 * context multiple time is not supported. A new codec context should be
3293 * allocated for each new use.
3294 */
3295 int avcodec_get_context_defaults3(AVCodecContext *s, const AVCodec *codec);
3296 #endif
3297
3298 /**
3299 * Get the AVClass for AVCodecContext. It can be used in combination with
3300 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
3301 *
3302 * @see av_opt_find().
3303 */
3304 const AVClass *avcodec_get_class(void);
3305
3306 #if FF_API_COPY_CONTEXT
3307 /**
3308 * Copy the settings of the source AVCodecContext into the destination
3309 * AVCodecContext. The resulting destination codec context will be
3310 * unopened, i.e. you are required to call avcodec_open2() before you
3311 * can use this AVCodecContext to decode/encode video/audio data.
3312 *
3313 * @param dest target codec context, should be initialized with
3314 * avcodec_alloc_context3(), but otherwise uninitialized
3315 * @param src source codec context
3316 * @return AVERROR() on error (e.g. memory allocation error), 0 on success
3317 *
3318 * @deprecated The semantics of this function are ill-defined and it should not
3319 * be used. If you need to transfer the stream parameters from one codec context
3320 * to another, use an intermediate AVCodecParameters instance and the
3321 * avcodec_parameters_from_context() / avcodec_parameters_to_context()
3322 * functions.
3323 */
3324 attribute_deprecated
3325 int avcodec_copy_context(AVCodecContext *dest, const AVCodecContext *src);
3326 #endif
3327
3328 /**
3329 * Allocate a new AVCodecParameters and set its fields to default values
3330 * (unknown/invalid/0). The returned struct must be freed with
3331 * avcodec_parameters_free().
3332 */
3333 AVCodecParameters *avcodec_parameters_alloc(void);
3334
3335 /**
3336 * Free an AVCodecParameters instance and everything associated with it and
3337 * write NULL to the supplied pointer.
3338 */
3339 void avcodec_parameters_free(AVCodecParameters **par);
3340
3341 /**
3342 * Copy the contents of src to dst. Any allocated fields in dst are freed and
3343 * replaced with newly allocated duplicates of the corresponding fields in src.
3344 *
3345 * @return >= 0 on success, a negative AVERROR code on failure.
3346 */
3347 int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src);
3348
3349 /**
3350 * Fill the parameters struct based on the values from the supplied codec
3351 * context. Any allocated fields in par are freed and replaced with duplicates
3352 * of the corresponding fields in codec.
3353 *
3354 * @return >= 0 on success, a negative AVERROR code on failure
3355 */
3356 int avcodec_parameters_from_context(AVCodecParameters *par,
3357 const AVCodecContext *codec);
3358
3359 /**
3360 * Fill the codec context based on the values from the supplied codec
3361 * parameters. Any allocated fields in codec that have a corresponding field in
3362 * par are freed and replaced with duplicates of the corresponding field in par.
3363 * Fields in codec that do not have a counterpart in par are not touched.
3364 *
3365 * @return >= 0 on success, a negative AVERROR code on failure.
3366 */
3367 int avcodec_parameters_to_context(AVCodecContext *codec,
3368 const AVCodecParameters *par);
3369
3370 /**
3371 * Initialize the AVCodecContext to use the given AVCodec. Prior to using this
3372 * function the context has to be allocated with avcodec_alloc_context3().
3373 *
3374 * The functions avcodec_find_decoder_by_name(), avcodec_find_encoder_by_name(),
3375 * avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for
3376 * retrieving a codec.
3377 *
3378 * @warning This function is not thread safe!
3379 *
3380 * @note Always call this function before using decoding routines (such as
3381 * @ref avcodec_receive_frame()).
3382 *
3383 * @code
3384 * avcodec_register_all();
3385 * av_dict_set(&opts, "b", "2.5M", 0);
3386 * codec = avcodec_find_decoder(AV_CODEC_ID_H264);
3387 * if (!codec)
3388 * exit(1);
3389 *
3390 * context = avcodec_alloc_context3(codec);
3391 *
3392 * if (avcodec_open2(context, codec, opts) < 0)
3393 * exit(1);
3394 * @endcode
3395 *
3396 * @param avctx The context to initialize.
3397 * @param codec The codec to open this context for. If a non-NULL codec has been
3398 * previously passed to avcodec_alloc_context3() or
3399 * for this context, then this parameter MUST be either NULL or
3400 * equal to the previously passed codec.
3401 * @param options A dictionary filled with AVCodecContext and codec-private options.
3402 * On return this object will be filled with options that were not found.
3403 *
3404 * @return zero on success, a negative value on error
3405 * @see avcodec_alloc_context3(), avcodec_find_decoder(), avcodec_find_encoder(),
3406 * av_dict_set(), av_opt_find().
3407 */
3408 int avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options);
3409
3410 /**
3411 * Close a given AVCodecContext and free all the data associated with it
3412 * (but not the AVCodecContext itself).
3413 *
3414 * Calling this function on an AVCodecContext that hasn't been opened will free
3415 * the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL
3416 * codec. Subsequent calls will do nothing.
3417 *
3418 * @note Do not use this function. Use avcodec_free_context() to destroy a
3419 * codec context (either open or closed). Opening and closing a codec context
3420 * multiple times is not supported anymore -- use multiple codec contexts
3421 * instead.
3422 */
3423 int avcodec_close(AVCodecContext *avctx);
3424
3425 /**
3426 * Free all allocated data in the given subtitle struct.
3427 *
3428 * @param sub AVSubtitle to free.
3429 */
3430 void avsubtitle_free(AVSubtitle *sub);
3431
3432 /**
3433 * @}
3434 */
3435
3436 /**
3437 * @addtogroup lavc_packet
3438 * @{
3439 */
3440
3441 /**
3442 * Allocate an AVPacket and set its fields to default values. The resulting
3443 * struct must be freed using av_packet_free().
3444 *
3445 * @return An AVPacket filled with default values or NULL on failure.
3446 *
3447 * @note this only allocates the AVPacket itself, not the data buffers. Those
3448 * must be allocated through other means such as av_new_packet.
3449 *
3450 * @see av_new_packet
3451 */
3452 AVPacket *av_packet_alloc(void);
3453
3454 /**
3455 * Create a new packet that references the same data as src.
3456 *
3457 * This is a shortcut for av_packet_alloc()+av_packet_ref().
3458 *
3459 * @return newly created AVPacket on success, NULL on error.
3460 *
3461 * @see av_packet_alloc
3462 * @see av_packet_ref
3463 */
3464 AVPacket *av_packet_clone(const AVPacket *src);
3465
3466 /**
3467 * Free the packet, if the packet is reference counted, it will be
3468 * unreferenced first.
3469 *
3470 * @param pkt packet to be freed. The pointer will be set to NULL.
3471 * @note passing NULL is a no-op.
3472 */
3473 void av_packet_free(AVPacket **pkt);
3474
3475 /**
3476 * Initialize optional fields of a packet with default values.
3477 *
3478 * Note, this does not touch the data and size members, which have to be
3479 * initialized separately.
3480 *
3481 * @param pkt packet
3482 */
3483 void av_init_packet(AVPacket *pkt);
3484
3485 /**
3486 * Allocate the payload of a packet and initialize its fields with
3487 * default values.
3488 *
3489 * @param pkt packet
3490 * @param size wanted payload size
3491 * @return 0 if OK, AVERROR_xxx otherwise
3492 */
3493 int av_new_packet(AVPacket *pkt, int size);
3494
3495 /**
3496 * Reduce packet size, correctly zeroing padding
3497 *
3498 * @param pkt packet
3499 * @param size new size
3500 */
3501 void av_shrink_packet(AVPacket *pkt, int size);
3502
3503 /**
3504 * Increase packet size, correctly zeroing padding
3505 *
3506 * @param pkt packet
3507 * @param grow_by number of bytes by which to increase the size of the packet
3508 */
3509 int av_grow_packet(AVPacket *pkt, int grow_by);
3510
3511 /**
3512 * Initialize a reference-counted packet from av_malloc()ed data.
3513 *
3514 * @param pkt packet to be initialized. This function will set the data, size,
3515 * buf and destruct fields, all others are left untouched.
3516 * @param data Data allocated by av_malloc() to be used as packet data. If this
3517 * function returns successfully, the data is owned by the underlying AVBuffer.
3518 * The caller may not access the data through other means.
3519 * @param size size of data in bytes, without the padding. I.e. the full buffer
3520 * size is assumed to be size + AV_INPUT_BUFFER_PADDING_SIZE.
3521 *
3522 * @return 0 on success, a negative AVERROR on error
3523 */
3524 int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size);
3525
3526 #if FF_API_AVPACKET_OLD_API
3527 /**
3528 * @warning This is a hack - the packet memory allocation stuff is broken. The
3529 * packet is allocated if it was not really allocated.
3530 *
3531 * @deprecated Use av_packet_ref
3532 */
3533 attribute_deprecated
3534 int av_dup_packet(AVPacket *pkt);
3535 /**
3536 * Free a packet.
3537 *
3538 * @deprecated Use av_packet_unref
3539 *
3540 * @param pkt packet to free
3541 */
3542 attribute_deprecated
3543 void av_free_packet(AVPacket *pkt);
3544 #endif
3545 /**
3546 * Allocate new information of a packet.
3547 *
3548 * @param pkt packet
3549 * @param type side information type
3550 * @param size side information size
3551 * @return pointer to fresh allocated data or NULL otherwise
3552 */
3553 uint8_t* av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3554 int size);
3555
3556 /**
3557 * Wrap an existing array as a packet side data.
3558 *
3559 * @param pkt packet
3560 * @param type side information type
3561 * @param data the side data array. It must be allocated with the av_malloc()
3562 * family of functions. The ownership of the data is transferred to
3563 * pkt.
3564 * @param size side information size
3565 * @return a non-negative number on success, a negative AVERROR code on
3566 * failure. On failure, the packet is unchanged and the data remains
3567 * owned by the caller.
3568 */
3569 int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3570 uint8_t *data, size_t size);
3571
3572 /**
3573 * Shrink the already allocated side data buffer
3574 *
3575 * @param pkt packet
3576 * @param type side information type
3577 * @param size new side information size
3578 * @return 0 on success, < 0 on failure
3579 */
3580 int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3581 int size);
3582
3583 /**
3584 * Get side information from packet.
3585 *
3586 * @param pkt packet
3587 * @param type desired side information type
3588 * @param size pointer for side information size to store (optional)
3589 * @return pointer to data if present or NULL otherwise
3590 */
3591 uint8_t* av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
3592 int *size);
3593
3594 /**
3595 * Convenience function to free all the side data stored.
3596 * All the other fields stay untouched.
3597 *
3598 * @param pkt packet
3599 */
3600 void av_packet_free_side_data(AVPacket *pkt);
3601
3602 /**
3603 * Setup a new reference to the data described by a given packet
3604 *
3605 * If src is reference-counted, setup dst as a new reference to the
3606 * buffer in src. Otherwise allocate a new buffer in dst and copy the
3607 * data from src into it.
3608 *
3609 * All the other fields are copied from src.
3610 *
3611 * @see av_packet_unref
3612 *
3613 * @param dst Destination packet
3614 * @param src Source packet
3615 *
3616 * @return 0 on success, a negative AVERROR on error.
3617 */
3618 int av_packet_ref(AVPacket *dst, const AVPacket *src);
3619
3620 /**
3621 * Wipe the packet.
3622 *
3623 * Unreference the buffer referenced by the packet and reset the
3624 * remaining packet fields to their default values.
3625 *
3626 * @param pkt The packet to be unreferenced.
3627 */
3628 void av_packet_unref(AVPacket *pkt);
3629
3630 /**
3631 * Move every field in src to dst and reset src.
3632 *
3633 * @see av_packet_unref
3634 *
3635 * @param src Source packet, will be reset
3636 * @param dst Destination packet
3637 */
3638 void av_packet_move_ref(AVPacket *dst, AVPacket *src);
3639
3640 /**
3641 * Copy only "properties" fields from src to dst.
3642 *
3643 * Properties for the purpose of this function are all the fields
3644 * beside those related to the packet data (buf, data, size)
3645 *
3646 * @param dst Destination packet
3647 * @param src Source packet
3648 *
3649 * @return 0 on success AVERROR on failure.
3650 */
3651 int av_packet_copy_props(AVPacket *dst, const AVPacket *src);
3652
3653 /**
3654 * Convert valid timing fields (timestamps / durations) in a packet from one
3655 * timebase to another. Timestamps with unknown values (AV_NOPTS_VALUE) will be
3656 * ignored.
3657 *
3658 * @param pkt packet on which the conversion will be performed
3659 * @param tb_src source timebase, in which the timing fields in pkt are
3660 * expressed
3661 * @param tb_dst destination timebase, to which the timing fields will be
3662 * converted
3663 */
3664 void av_packet_rescale_ts(AVPacket *pkt, AVRational tb_src, AVRational tb_dst);
3665
3666 /**
3667 * @}
3668 */
3669
3670 /**
3671 * @addtogroup lavc_decoding
3672 * @{
3673 */
3674
3675 /**
3676 * Find a registered decoder with a matching codec ID.
3677 *
3678 * @param id AVCodecID of the requested decoder
3679 * @return A decoder if one was found, NULL otherwise.
3680 */
3681 AVCodec *avcodec_find_decoder(enum AVCodecID id);
3682
3683 /**
3684 * Find a registered decoder with the specified name.
3685 *
3686 * @param name name of the requested decoder
3687 * @return A decoder if one was found, NULL otherwise.
3688 */
3689 AVCodec *avcodec_find_decoder_by_name(const char *name);
3690
3691 /**
3692 * The default callback for AVCodecContext.get_buffer2(). It is made public so
3693 * it can be called by custom get_buffer2() implementations for decoders without
3694 * AV_CODEC_CAP_DR1 set.
3695 */
3696 int avcodec_default_get_buffer2(AVCodecContext *s, AVFrame *frame, int flags);
3697
3698 /**
3699 * Modify width and height values so that they will result in a memory
3700 * buffer that is acceptable for the codec if you do not use any horizontal
3701 * padding.
3702 *
3703 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
3704 */
3705 void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height);
3706
3707 /**
3708 * Modify width and height values so that they will result in a memory
3709 * buffer that is acceptable for the codec if you also ensure that all
3710 * line sizes are a multiple of the respective linesize_align[i].
3711 *
3712 * May only be used if a codec with AV_CODEC_CAP_DR1 has been opened.
3713 */
3714 void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
3715 int linesize_align[AV_NUM_DATA_POINTERS]);
3716
3717 /**
3718 * Decode the audio frame of size avpkt->size from avpkt->data into frame.
3719 *
3720 * Some decoders may support multiple frames in a single AVPacket. Such
3721 * decoders would then just decode the first frame and the return value would be
3722 * less than the packet size. In this case, avcodec_decode_audio4 has to be
3723 * called again with an AVPacket containing the remaining data in order to
3724 * decode the second frame, etc... Even if no frames are returned, the packet
3725 * needs to be fed to the decoder with remaining data until it is completely
3726 * consumed or an error occurs.
3727 *
3728 * Some decoders (those marked with AV_CODEC_CAP_DELAY) have a delay between input
3729 * and output. This means that for some packets they will not immediately
3730 * produce decoded output and need to be flushed at the end of decoding to get
3731 * all the decoded data. Flushing is done by calling this function with packets
3732 * with avpkt->data set to NULL and avpkt->size set to 0 until it stops
3733 * returning samples. It is safe to flush even those decoders that are not
3734 * marked with AV_CODEC_CAP_DELAY, then no samples will be returned.
3735 *
3736 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
3737 * larger than the actual read bytes because some optimized bitstream
3738 * readers read 32 or 64 bits at once and could read over the end.
3739 *
3740 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3741 * before packets may be fed to the decoder.
3742 *
3743 * @param avctx the codec context
3744 * @param[out] frame The AVFrame in which to store decoded audio samples.
3745 * The decoder will allocate a buffer for the decoded frame by
3746 * calling the AVCodecContext.get_buffer2() callback.
3747 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3748 * reference counted and the returned reference belongs to the
3749 * caller. The caller must release the frame using av_frame_unref()
3750 * when the frame is no longer needed. The caller may safely write
3751 * to the frame if av_frame_is_writable() returns 1.
3752 * When AVCodecContext.refcounted_frames is set to 0, the returned
3753 * reference belongs to the decoder and is valid only until the
3754 * next call to this function or until closing or flushing the
3755 * decoder. The caller may not write to it.
3756 * @param[out] got_frame_ptr Zero if no frame could be decoded, otherwise it is
3757 * non-zero. Note that this field being set to zero
3758 * does not mean that an error has occurred. For
3759 * decoders with AV_CODEC_CAP_DELAY set, no given decode
3760 * call is guaranteed to produce a frame.
3761 * @param[in] avpkt The input AVPacket containing the input buffer.
3762 * At least avpkt->data and avpkt->size should be set. Some
3763 * decoders might also require additional fields to be set.
3764 * @return A negative error code is returned if an error occurred during
3765 * decoding, otherwise the number of bytes consumed from the input
3766 * AVPacket is returned.
3767 *
3768 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
3769 */
3770 attribute_deprecated
3771 int avcodec_decode_audio4(AVCodecContext *avctx, AVFrame *frame,
3772 int *got_frame_ptr, AVPacket *avpkt);
3773
3774 /**
3775 * Decode the video frame of size avpkt->size from avpkt->data into picture.
3776 * Some decoders may support multiple frames in a single AVPacket, such
3777 * decoders would then just decode the first frame.
3778 *
3779 * @warning The input buffer must be AV_INPUT_BUFFER_PADDING_SIZE larger than
3780 * the actual read bytes because some optimized bitstream readers read 32 or 64
3781 * bits at once and could read over the end.
3782 *
3783 * @warning The end of the input buffer buf should be set to 0 to ensure that
3784 * no overreading happens for damaged MPEG streams.
3785 *
3786 * @note Codecs which have the AV_CODEC_CAP_DELAY capability set have a delay
3787 * between input and output, these need to be fed with avpkt->data=NULL,
3788 * avpkt->size=0 at the end to return the remaining frames.
3789 *
3790 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3791 * before packets may be fed to the decoder.
3792 *
3793 * @param avctx the codec context
3794 * @param[out] picture The AVFrame in which the decoded video frame will be stored.
3795 * Use av_frame_alloc() to get an AVFrame. The codec will
3796 * allocate memory for the actual bitmap by calling the
3797 * AVCodecContext.get_buffer2() callback.
3798 * When AVCodecContext.refcounted_frames is set to 1, the frame is
3799 * reference counted and the returned reference belongs to the
3800 * caller. The caller must release the frame using av_frame_unref()
3801 * when the frame is no longer needed. The caller may safely write
3802 * to the frame if av_frame_is_writable() returns 1.
3803 * When AVCodecContext.refcounted_frames is set to 0, the returned
3804 * reference belongs to the decoder and is valid only until the
3805 * next call to this function or until closing or flushing the
3806 * decoder. The caller may not write to it.
3807 *
3808 * @param[in] avpkt The input AVPacket containing the input buffer.
3809 * You can create such packet with av_init_packet() and by then setting
3810 * data and size, some decoders might in addition need other fields like
3811 * flags&AV_PKT_FLAG_KEY. All decoders are designed to use the least
3812 * fields possible.
3813 * @param[in,out] got_picture_ptr Zero if no frame could be decompressed, otherwise, it is nonzero.
3814 * @return On error a negative value is returned, otherwise the number of bytes
3815 * used or zero if no frame could be decompressed.
3816 *
3817 * @deprecated Use avcodec_send_packet() and avcodec_receive_frame().
3818 */
3819 attribute_deprecated
3820 int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
3821 int *got_picture_ptr,
3822 AVPacket *avpkt);
3823
3824 /**
3825 * Decode a subtitle message.
3826 * Return a negative value on error, otherwise return the number of bytes used.
3827 * If no subtitle could be decompressed, got_sub_ptr is zero.
3828 * Otherwise, the subtitle is stored in *sub.
3829 * Note that AV_CODEC_CAP_DR1 is not available for subtitle codecs. This is for
3830 * simplicity, because the performance difference is expect to be negligible
3831 * and reusing a get_buffer written for video codecs would probably perform badly
3832 * due to a potentially very different allocation pattern.
3833 *
3834 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3835 * before packets may be fed to the decoder.
3836 *
3837 * @param avctx the codec context
3838 * @param[out] sub The AVSubtitle in which the decoded subtitle will be stored, must be
3839 freed with avsubtitle_free if *got_sub_ptr is set.
3840 * @param[in,out] got_sub_ptr Zero if no subtitle could be decompressed, otherwise, it is nonzero.
3841 * @param[in] avpkt The input AVPacket containing the input buffer.
3842 */
3843 int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,
3844 int *got_sub_ptr,
3845 AVPacket *avpkt);
3846
3847 /**
3848 * Supply raw packet data as input to a decoder.
3849 *
3850 * Internally, this call will copy relevant AVCodecContext fields, which can
3851 * influence decoding per-packet, and apply them when the packet is actually
3852 * decoded. (For example AVCodecContext.skip_frame, which might direct the
3853 * decoder to drop the frame contained by the packet sent with this function.)
3854 *
3855 * @warning The input buffer, avpkt->data must be AV_INPUT_BUFFER_PADDING_SIZE
3856 * larger than the actual read bytes because some optimized bitstream
3857 * readers read 32 or 64 bits at once and could read over the end.
3858 *
3859 * @warning Do not mix this API with the legacy API (like avcodec_decode_video2())
3860 * on the same AVCodecContext. It will return unexpected results now
3861 * or in future libavcodec versions.
3862 *
3863 * @note The AVCodecContext MUST have been opened with @ref avcodec_open2()
3864 * before packets may be fed to the decoder.
3865 *
3866 * @param avctx codec context
3867 * @param[in] avpkt The input AVPacket. Usually, this will be a single video
3868 * frame, or several complete audio frames.
3869 * Ownership of the packet remains with the caller, and the
3870 * decoder will not write to the packet. The decoder may create
3871 * a reference to the packet data (or copy it if the packet is
3872 * not reference-counted).
3873 * Unlike with older APIs, the packet is always fully consumed,
3874 * and if it contains multiple frames (e.g. some audio codecs),
3875 * will require you to call avcodec_receive_frame() multiple
3876 * times afterwards before you can send a new packet.
3877 * It can be NULL (or an AVPacket with data set to NULL and
3878 * size set to 0); in this case, it is considered a flush
3879 * packet, which signals the end of the stream. Sending the
3880 * first flush packet will return success. Subsequent ones are
3881 * unnecessary and will return AVERROR_EOF. If the decoder
3882 * still has frames buffered, it will return them after sending
3883 * a flush packet.
3884 *
3885 * @return 0 on success, otherwise negative error code:
3886 * AVERROR(EAGAIN): input is not accepted in the current state - user
3887 * must read output with avcodec_receive_frame() (once
3888 * all output is read, the packet should be resent, and
3889 * the call will not fail with EAGAIN).
3890 * AVERROR_EOF: the decoder has been flushed, and no new packets can
3891 * be sent to it (also returned if more than 1 flush
3892 * packet is sent)
3893 * AVERROR(EINVAL): codec not opened, it is an encoder, or requires flush
3894 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
3895 * other errors: legitimate decoding errors
3896 */
3897 int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt);
3898
3899 /**
3900 * Return decoded output data from a decoder.
3901 *
3902 * @param avctx codec context
3903 * @param frame This will be set to a reference-counted video or audio
3904 * frame (depending on the decoder type) allocated by the
3905 * decoder. Note that the function will always call
3906 * av_frame_unref(frame) before doing anything else.
3907 *
3908 * @return
3909 * 0: success, a frame was returned
3910 * AVERROR(EAGAIN): output is not available in this state - user must try
3911 * to send new input
3912 * AVERROR_EOF: the decoder has been fully flushed, and there will be
3913 * no more output frames
3914 * AVERROR(EINVAL): codec not opened, or it is an encoder
3915 * other negative values: legitimate decoding errors
3916 */
3917 int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame);
3918
3919 /**
3920 * Supply a raw video or audio frame to the encoder. Use avcodec_receive_packet()
3921 * to retrieve buffered output packets.
3922 *
3923 * @param avctx codec context
3924 * @param[in] frame AVFrame containing the raw audio or video frame to be encoded.
3925 * Ownership of the frame remains with the caller, and the
3926 * encoder will not write to the frame. The encoder may create
3927 * a reference to the frame data (or copy it if the frame is
3928 * not reference-counted).
3929 * It can be NULL, in which case it is considered a flush
3930 * packet. This signals the end of the stream. If the encoder
3931 * still has packets buffered, it will return them after this
3932 * call. Once flushing mode has been entered, additional flush
3933 * packets are ignored, and sending frames will return
3934 * AVERROR_EOF.
3935 *
3936 * For audio:
3937 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
3938 * can have any number of samples.
3939 * If it is not set, frame->nb_samples must be equal to
3940 * avctx->frame_size for all frames except the last.
3941 * The final frame may be smaller than avctx->frame_size.
3942 * @return 0 on success, otherwise negative error code:
3943 * AVERROR(EAGAIN): input is not accepted in the current state - user
3944 * must read output with avcodec_receive_packet() (once
3945 * all output is read, the packet should be resent, and
3946 * the call will not fail with EAGAIN).
3947 * AVERROR_EOF: the encoder has been flushed, and no new frames can
3948 * be sent to it
3949 * AVERROR(EINVAL): codec not opened, refcounted_frames not set, it is a
3950 * decoder, or requires flush
3951 * AVERROR(ENOMEM): failed to add packet to internal queue, or similar
3952 * other errors: legitimate decoding errors
3953 */
3954 int avcodec_send_frame(AVCodecContext *avctx, const AVFrame *frame);
3955
3956 /**
3957 * Read encoded data from the encoder.
3958 *
3959 * @param avctx codec context
3960 * @param avpkt This will be set to a reference-counted packet allocated by the
3961 * encoder. Note that the function will always call
3962 * av_frame_unref(frame) before doing anything else.
3963 * @return 0 on success, otherwise negative error code:
3964 * AVERROR(EAGAIN): output is not available in the current state - user
3965 * must try to send input
3966 * AVERROR_EOF: the encoder has been fully flushed, and there will be
3967 * no more output packets
3968 * AVERROR(EINVAL): codec not opened, or it is an encoder
3969 * other errors: legitimate decoding errors
3970 */
3971 int avcodec_receive_packet(AVCodecContext *avctx, AVPacket *avpkt);
3972
3973
3974 /**
3975 * @defgroup lavc_parsing Frame parsing
3976 * @{
3977 */
3978
3979 enum AVPictureStructure {
3980 AV_PICTURE_STRUCTURE_UNKNOWN, //< unknown
3981 AV_PICTURE_STRUCTURE_TOP_FIELD, //< coded as top field
3982 AV_PICTURE_STRUCTURE_BOTTOM_FIELD, //< coded as bottom field
3983 AV_PICTURE_STRUCTURE_FRAME, //< coded as frame
3984 };
3985
3986 typedef struct AVCodecParserContext {
3987 void *priv_data;
3988 struct AVCodecParser *parser;
3989 int64_t frame_offset; /* offset of the current frame */
3990 int64_t cur_offset; /* current offset
3991 (incremented by each av_parser_parse()) */
3992 int64_t next_frame_offset; /* offset of the next frame */
3993 /* video info */
3994 int pict_type; /* XXX: Put it back in AVCodecContext. */
3995 /**
3996 * This field is used for proper frame duration computation in lavf.
3997 * It signals, how much longer the frame duration of the current frame
3998 * is compared to normal frame duration.
3999 *
4000 * frame_duration = (1 + repeat_pict) * time_base
4001 *
4002 * It is used by codecs like H.264 to display telecined material.
4003 */
4004 int repeat_pict; /* XXX: Put it back in AVCodecContext. */
4005 int64_t pts; /* pts of the current frame */
4006 int64_t dts; /* dts of the current frame */
4007
4008 /* private data */
4009 int64_t last_pts;
4010 int64_t last_dts;
4011 int fetch_timestamp;
4012
4013 #define AV_PARSER_PTS_NB 4
4014 int cur_frame_start_index;
4015 int64_t cur_frame_offset[AV_PARSER_PTS_NB];
4016 int64_t cur_frame_pts[AV_PARSER_PTS_NB];
4017 int64_t cur_frame_dts[AV_PARSER_PTS_NB];
4018
4019 int flags;
4020 #define PARSER_FLAG_COMPLETE_FRAMES 0x0001
4021 #define PARSER_FLAG_ONCE 0x0002
4022 /// Set if the parser has a valid file offset
4023 #define PARSER_FLAG_FETCHED_OFFSET 0x0004
4024
4025 int64_t offset; ///< byte offset from starting packet start
4026 int64_t cur_frame_end[AV_PARSER_PTS_NB];
4027
4028 /**
4029 * Set by parser to 1 for key frames and 0 for non-key frames.
4030 * It is initialized to -1, so if the parser doesn't set this flag,
4031 * old-style fallback using AV_PICTURE_TYPE_I picture type as key frames
4032 * will be used.
4033 */
4034 int key_frame;
4035
4036 #if FF_API_CONVERGENCE_DURATION
4037 /**
4038 * @deprecated unused
4039 */
4040 attribute_deprecated
4041 int64_t convergence_duration;
4042 #endif
4043
4044 // Timestamp generation support:
4045 /**
4046 * Synchronization point for start of timestamp generation.
4047 *
4048 * Set to >0 for sync point, 0 for no sync point and <0 for undefined
4049 * (default).
4050 *
4051 * For example, this corresponds to presence of H.264 buffering period
4052 * SEI message.
4053 */
4054 int dts_sync_point;
4055
4056 /**
4057 * Offset of the current timestamp against last timestamp sync point in
4058 * units of AVCodecContext.time_base.
4059 *
4060 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4061 * contain a valid timestamp offset.
4062 *
4063 * Note that the timestamp of sync point has usually a nonzero
4064 * dts_ref_dts_delta, which refers to the previous sync point. Offset of
4065 * the next frame after timestamp sync point will be usually 1.
4066 *
4067 * For example, this corresponds to H.264 cpb_removal_delay.
4068 */
4069 int dts_ref_dts_delta;
4070
4071 /**
4072 * Presentation delay of current frame in units of AVCodecContext.time_base.
4073 *
4074 * Set to INT_MIN when dts_sync_point unused. Otherwise, it must
4075 * contain valid non-negative timestamp delta (presentation time of a frame
4076 * must not lie in the past).
4077 *
4078 * This delay represents the difference between decoding and presentation
4079 * time of the frame.
4080 *
4081 * For example, this corresponds to H.264 dpb_output_delay.
4082 */
4083 int pts_dts_delta;
4084
4085 /**
4086 * Position of the packet in file.
4087 *
4088 * Analogous to cur_frame_pts/dts
4089 */
4090 int64_t cur_frame_pos[AV_PARSER_PTS_NB];
4091
4092 /**
4093 * Byte position of currently parsed frame in stream.
4094 */
4095 int64_t pos;
4096
4097 /**
4098 * Previous frame byte position.
4099 */
4100 int64_t last_pos;
4101
4102 /**
4103 * Duration of the current frame.
4104 * For audio, this is in units of 1 / AVCodecContext.sample_rate.
4105 * For all other types, this is in units of AVCodecContext.time_base.
4106 */
4107 int duration;
4108
4109 enum AVFieldOrder field_order;
4110
4111 /**
4112 * Indicate whether a picture is coded as a frame, top field or bottom field.
4113 *
4114 * For example, H.264 field_pic_flag equal to 0 corresponds to
4115 * AV_PICTURE_STRUCTURE_FRAME. An H.264 picture with field_pic_flag
4116 * equal to 1 and bottom_field_flag equal to 0 corresponds to
4117 * AV_PICTURE_STRUCTURE_TOP_FIELD.
4118 */
4119 enum AVPictureStructure picture_structure;
4120
4121 /**
4122 * Picture number incremented in presentation or output order.
4123 * This field may be reinitialized at the first picture of a new sequence.
4124 *
4125 * For example, this corresponds to H.264 PicOrderCnt.
4126 */
4127 int output_picture_number;
4128
4129 /**
4130 * Dimensions of the decoded video intended for presentation.
4131 */
4132 int width;
4133 int height;
4134
4135 /**
4136 * Dimensions of the coded video.
4137 */
4138 int coded_width;
4139 int coded_height;
4140
4141 /**
4142 * The format of the coded data, corresponds to enum AVPixelFormat for video
4143 * and for enum AVSampleFormat for audio.
4144 *
4145 * Note that a decoder can have considerable freedom in how exactly it
4146 * decodes the data, so the format reported here might be different from the
4147 * one returned by a decoder.
4148 */
4149 int format;
4150 } AVCodecParserContext;
4151
4152 typedef struct AVCodecParser {
4153 int codec_ids[5]; /* several codec IDs are permitted */
4154 int priv_data_size;
4155 int (*parser_init)(AVCodecParserContext *s);
4156 /* This callback never returns an error, a negative value means that
4157 * the frame start was in a previous packet. */
4158 int (*parser_parse)(AVCodecParserContext *s,
4159 AVCodecContext *avctx,
4160 const uint8_t **poutbuf, int *poutbuf_size,
4161 const uint8_t *buf, int buf_size);
4162 void (*parser_close)(AVCodecParserContext *s);
4163 int (*split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size);
4164 struct AVCodecParser *next;
4165 } AVCodecParser;
4166
4167 AVCodecParser *av_parser_next(const AVCodecParser *c);
4168
4169 void av_register_codec_parser(AVCodecParser *parser);
4170 AVCodecParserContext *av_parser_init(int codec_id);
4171
4172 /**
4173 * Parse a packet.
4174 *
4175 * @param s parser context.
4176 * @param avctx codec context.
4177 * @param poutbuf set to pointer to parsed buffer or NULL if not yet finished.
4178 * @param poutbuf_size set to size of parsed buffer or zero if not yet finished.
4179 * @param buf input buffer.
4180 * @param buf_size input length, to signal EOF, this should be 0 (so that the last frame can be output).
4181 * @param pts input presentation timestamp.
4182 * @param dts input decoding timestamp.
4183 * @param pos input byte position in stream.
4184 * @return the number of bytes of the input bitstream used.
4185 *
4186 * Example:
4187 * @code
4188 * while(in_len){
4189 * len = av_parser_parse2(myparser, AVCodecContext, &data, &size,
4190 * in_data, in_len,
4191 * pts, dts, pos);
4192 * in_data += len;
4193 * in_len -= len;
4194 *
4195 * if(size)
4196 * decode_frame(data, size);
4197 * }
4198 * @endcode
4199 */
4200 int av_parser_parse2(AVCodecParserContext *s,
4201 AVCodecContext *avctx,
4202 uint8_t **poutbuf, int *poutbuf_size,
4203 const uint8_t *buf, int buf_size,
4204 int64_t pts, int64_t dts,
4205 int64_t pos);
4206
4207 /**
4208 * @return 0 if the output buffer is a subset of the input, 1 if it is allocated and must be freed
4209 * @deprecated use AVBitstreamFilter
4210 */
4211 int av_parser_change(AVCodecParserContext *s,
4212 AVCodecContext *avctx,
4213 uint8_t **poutbuf, int *poutbuf_size,
4214 const uint8_t *buf, int buf_size, int keyframe);
4215 void av_parser_close(AVCodecParserContext *s);
4216
4217 /**
4218 * @}
4219 * @}
4220 */
4221
4222 /**
4223 * @addtogroup lavc_encoding
4224 * @{
4225 */
4226
4227 /**
4228 * Find a registered encoder with a matching codec ID.
4229 *
4230 * @param id AVCodecID of the requested encoder
4231 * @return An encoder if one was found, NULL otherwise.
4232 */
4233 AVCodec *avcodec_find_encoder(enum AVCodecID id);
4234
4235 /**
4236 * Find a registered encoder with the specified name.
4237 *
4238 * @param name name of the requested encoder
4239 * @return An encoder if one was found, NULL otherwise.
4240 */
4241 AVCodec *avcodec_find_encoder_by_name(const char *name);
4242
4243 /**
4244 * Encode a frame of audio.
4245 *
4246 * Takes input samples from frame and writes the next output packet, if
4247 * available, to avpkt. The output packet does not necessarily contain data for
4248 * the most recent frame, as encoders can delay, split, and combine input frames
4249 * internally as needed.
4250 *
4251 * @param avctx codec context
4252 * @param avpkt output AVPacket.
4253 * The user can supply an output buffer by setting
4254 * avpkt->data and avpkt->size prior to calling the
4255 * function, but if the size of the user-provided data is not
4256 * large enough, encoding will fail. All other AVPacket fields
4257 * will be reset by the encoder using av_init_packet(). If
4258 * avpkt->data is NULL, the encoder will allocate it.
4259 * The encoder will set avpkt->size to the size of the
4260 * output packet.
4261 *
4262 * If this function fails or produces no output, avpkt will be
4263 * freed using av_packet_unref().
4264 * @param[in] frame AVFrame containing the raw audio data to be encoded.
4265 * May be NULL when flushing an encoder that has the
4266 * AV_CODEC_CAP_DELAY capability set.
4267 * If AV_CODEC_CAP_VARIABLE_FRAME_SIZE is set, then each frame
4268 * can have any number of samples.
4269 * If it is not set, frame->nb_samples must be equal to
4270 * avctx->frame_size for all frames except the last.
4271 * The final frame may be smaller than avctx->frame_size.
4272 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4273 * output packet is non-empty, and to 0 if it is
4274 * empty. If the function returns an error, the
4275 * packet can be assumed to be invalid, and the
4276 * value of got_packet_ptr is undefined and should
4277 * not be used.
4278 * @return 0 on success, negative error code on failure
4279 *
4280 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
4281 */
4282 attribute_deprecated
4283 int avcodec_encode_audio2(AVCodecContext *avctx, AVPacket *avpkt,
4284 const AVFrame *frame, int *got_packet_ptr);
4285
4286 /**
4287 * Encode a frame of video.
4288 *
4289 * Takes input raw video data from frame and writes the next output packet, if
4290 * available, to avpkt. The output packet does not necessarily contain data for
4291 * the most recent frame, as encoders can delay and reorder input frames
4292 * internally as needed.
4293 *
4294 * @param avctx codec context
4295 * @param avpkt output AVPacket.
4296 * The user can supply an output buffer by setting
4297 * avpkt->data and avpkt->size prior to calling the
4298 * function, but if the size of the user-provided data is not
4299 * large enough, encoding will fail. All other AVPacket fields
4300 * will be reset by the encoder using av_init_packet(). If
4301 * avpkt->data is NULL, the encoder will allocate it.
4302 * The encoder will set avpkt->size to the size of the
4303 * output packet. The returned data (if any) belongs to the
4304 * caller, he is responsible for freeing it.
4305 *
4306 * If this function fails or produces no output, avpkt will be
4307 * freed using av_packet_unref().
4308 * @param[in] frame AVFrame containing the raw video data to be encoded.
4309 * May be NULL when flushing an encoder that has the
4310 * AV_CODEC_CAP_DELAY capability set.
4311 * @param[out] got_packet_ptr This field is set to 1 by libavcodec if the
4312 * output packet is non-empty, and to 0 if it is
4313 * empty. If the function returns an error, the
4314 * packet can be assumed to be invalid, and the
4315 * value of got_packet_ptr is undefined and should
4316 * not be used.
4317 * @return 0 on success, negative error code on failure
4318 *
4319 * @deprecated use avcodec_send_frame()/avcodec_receive_packet() instead
4320 */
4321 attribute_deprecated
4322 int avcodec_encode_video2(AVCodecContext *avctx, AVPacket *avpkt,
4323 const AVFrame *frame, int *got_packet_ptr);
4324
4325 int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
4326 const AVSubtitle *sub);
4327
4328
4329 /**
4330 * @}
4331 */
4332
4333 #if FF_API_AVPICTURE
4334 /**
4335 * @addtogroup lavc_picture
4336 * @{
4337 */
4338
4339 /**
4340 * @deprecated unused
4341 */
4342 attribute_deprecated
4343 int avpicture_alloc(AVPicture *picture, enum AVPixelFormat pix_fmt, int width, int height);
4344
4345 /**
4346 * @deprecated unused
4347 */
4348 attribute_deprecated
4349 void avpicture_free(AVPicture *picture);
4350
4351 /**
4352 * @deprecated use av_image_fill_arrays() instead.
4353 */
4354 attribute_deprecated
4355 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
4356 enum AVPixelFormat pix_fmt, int width, int height);
4357
4358 /**
4359 * @deprecated use av_image_copy_to_buffer() instead.
4360 */
4361 attribute_deprecated
4362 int avpicture_layout(const AVPicture* src, enum AVPixelFormat pix_fmt,
4363 int width, int height,
4364 unsigned char *dest, int dest_size);
4365
4366 /**
4367 * @deprecated use av_image_get_buffer_size() instead.
4368 */
4369 attribute_deprecated
4370 int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height);
4371
4372 /**
4373 * @deprecated av_image_copy() instead.
4374 */
4375 attribute_deprecated
4376 void av_picture_copy(AVPicture *dst, const AVPicture *src,
4377 enum AVPixelFormat pix_fmt, int width, int height);
4378
4379 /**
4380 * @deprecated unused
4381 */
4382 attribute_deprecated
4383 int av_picture_crop(AVPicture *dst, const AVPicture *src,
4384 enum AVPixelFormat pix_fmt, int top_band, int left_band);
4385
4386 /**
4387 * @deprecated unused
4388 */
4389 attribute_deprecated
4390 int av_picture_pad(AVPicture *dst, const AVPicture *src, int height, int width, enum AVPixelFormat pix_fmt,
4391 int padtop, int padbottom, int padleft, int padright, int *color);
4392
4393 /**
4394 * @}
4395 */
4396 #endif
4397
4398 /**
4399 * @defgroup lavc_misc Utility functions
4400 * @ingroup libavc
4401 *
4402 * Miscellaneous utility functions related to both encoding and decoding
4403 * (or neither).
4404 * @{
4405 */
4406
4407 /**
4408 * @defgroup lavc_misc_pixfmt Pixel formats
4409 *
4410 * Functions for working with pixel formats.
4411 * @{
4412 */
4413
4414 /**
4415 * Return a value representing the fourCC code associated to the
4416 * pixel format pix_fmt, or 0 if no associated fourCC code can be
4417 * found.
4418 */
4419 unsigned int avcodec_pix_fmt_to_codec_tag(enum AVPixelFormat pix_fmt);
4420
4421 #define FF_LOSS_RESOLUTION 0x0001 /**< loss due to resolution change */
4422 #define FF_LOSS_DEPTH 0x0002 /**< loss due to color depth change */
4423 #define FF_LOSS_COLORSPACE 0x0004 /**< loss due to color space conversion */
4424 #define FF_LOSS_ALPHA 0x0008 /**< loss of alpha bits */
4425 #define FF_LOSS_COLORQUANT 0x0010 /**< loss due to color quantization */
4426 #define FF_LOSS_CHROMA 0x0020 /**< loss of chroma (e.g. RGB to gray conversion) */
4427
4428 /**
4429 * Compute what kind of losses will occur when converting from one specific
4430 * pixel format to another.
4431 * When converting from one pixel format to another, information loss may occur.
4432 * For example, when converting from RGB24 to GRAY, the color information will
4433 * be lost. Similarly, other losses occur when converting from some formats to
4434 * other formats. These losses can involve loss of chroma, but also loss of
4435 * resolution, loss of color depth, loss due to the color space conversion, loss
4436 * of the alpha bits or loss due to color quantization.
4437 * avcodec_get_fix_fmt_loss() informs you about the various types of losses
4438 * which will occur when converting from one pixel format to another.
4439 *
4440 * @param[in] dst_pix_fmt destination pixel format
4441 * @param[in] src_pix_fmt source pixel format
4442 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4443 * @return Combination of flags informing you what kind of losses will occur.
4444 */
4445 int avcodec_get_pix_fmt_loss(enum AVPixelFormat dst_pix_fmt, enum AVPixelFormat src_pix_fmt,
4446 int has_alpha);
4447
4448 /**
4449 * Find the best pixel format to convert to given a certain source pixel
4450 * format. When converting from one pixel format to another, information loss
4451 * may occur. For example, when converting from RGB24 to GRAY, the color
4452 * information will be lost. Similarly, other losses occur when converting from
4453 * some formats to other formats. avcodec_find_best_pix_fmt2() searches which of
4454 * the given pixel formats should be used to suffer the least amount of loss.
4455 * The pixel formats from which it chooses one, are determined by the
4456 * pix_fmt_list parameter.
4457 *
4458 *
4459 * @param[in] pix_fmt_list AV_PIX_FMT_NONE terminated array of pixel formats to choose from
4460 * @param[in] src_pix_fmt source pixel format
4461 * @param[in] has_alpha Whether the source pixel format alpha channel is used.
4462 * @param[out] loss_ptr Combination of flags informing you what kind of losses will occur.
4463 * @return The best pixel format to convert to or -1 if none was found.
4464 */
4465 enum AVPixelFormat avcodec_find_best_pix_fmt2(enum AVPixelFormat *pix_fmt_list,
4466 enum AVPixelFormat src_pix_fmt,
4467 int has_alpha, int *loss_ptr);
4468
4469 enum AVPixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum AVPixelFormat * fmt);
4470
4471 /**
4472 * @}
4473 */
4474
4475 /**
4476 * Put a string representing the codec tag codec_tag in buf.
4477 *
4478 * @param buf buffer to place codec tag in
4479 * @param buf_size size in bytes of buf
4480 * @param codec_tag codec tag to assign
4481 * @return the length of the string that would have been generated if
4482 * enough space had been available, excluding the trailing null
4483 */
4484 size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag);
4485
4486 void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);
4487
4488 /**
4489 * Return a name for the specified profile, if available.
4490 *
4491 * @param codec the codec that is searched for the given profile
4492 * @param profile the profile value for which a name is requested
4493 * @return A name for the profile if found, NULL otherwise.
4494 */
4495 const char *av_get_profile_name(const AVCodec *codec, int profile);
4496
4497 /**
4498 * Return a name for the specified profile, if available.
4499 *
4500 * @param codec_id the ID of the codec to which the requested profile belongs
4501 * @param profile the profile value for which a name is requested
4502 * @return A name for the profile if found, NULL otherwise.
4503 *
4504 * @note unlike av_get_profile_name(), which searches a list of profiles
4505 * supported by a specific decoder or encoder implementation, this
4506 * function searches the list of profiles from the AVCodecDescriptor
4507 */
4508 const char *avcodec_profile_name(enum AVCodecID codec_id, int profile);
4509
4510 int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size);
4511 int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int, int),void *arg, int *ret, int count);
4512 //FIXME func typedef
4513
4514 /**
4515 * Fill audio frame data and linesize.
4516 * AVFrame extended_data channel pointers are allocated if necessary for
4517 * planar audio.
4518 *
4519 * @param frame the AVFrame
4520 * frame->nb_samples must be set prior to calling the
4521 * function. This function fills in frame->data,
4522 * frame->extended_data, frame->linesize[0].
4523 * @param nb_channels channel count
4524 * @param sample_fmt sample format
4525 * @param buf buffer to use for frame data
4526 * @param buf_size size of buffer
4527 * @param align plane size sample alignment (0 = default)
4528 * @return 0 on success, negative error code on failure
4529 */
4530 int avcodec_fill_audio_frame(AVFrame *frame, int nb_channels,
4531 enum AVSampleFormat sample_fmt, const uint8_t *buf,
4532 int buf_size, int align);
4533
4534 /**
4535 * Reset the internal decoder state / flush internal buffers. Should be called
4536 * e.g. when seeking or when switching to a different stream.
4537 *
4538 * @note when refcounted frames are not used (i.e. avctx->refcounted_frames is 0),
4539 * this invalidates the frames previously returned from the decoder. When
4540 * refcounted frames are used, the decoder just releases any references it might
4541 * keep internally, but the caller's reference remains valid.
4542 */
4543 void avcodec_flush_buffers(AVCodecContext *avctx);
4544
4545 /**
4546 * Return codec bits per sample.
4547 *
4548 * @param[in] codec_id the codec
4549 * @return Number of bits per sample or zero if unknown for the given codec.
4550 */
4551 int av_get_bits_per_sample(enum AVCodecID codec_id);
4552