mp3dec: Fix a heap-buffer-overflow
[libav.git] / libavformat / avformat.h
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1/*
2 * copyright (c) 2001 Fabrice Bellard
3 *
2912e87a 4 * This file is part of Libav.
b78e7197 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
b78e7197 9 * version 2.1 of the License, or (at your option) any later version.
04d7f601 10 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 17 * License along with Libav; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
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21#ifndef AVFORMAT_AVFORMAT_H
22#define AVFORMAT_AVFORMAT_H
de6d9b64 23
e361b508 24/**
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25 * @file
26 * @ingroup libavf
27 * Main libavformat public API header
28 */
29
30/**
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31 * @defgroup libavf I/O and Muxing/Demuxing Library
32 * @{
33 *
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34 * Libavformat (lavf) is a library for dealing with various media container
35 * formats. Its main two purposes are demuxing - i.e. splitting a media file
36 * into component streams, and the reverse process of muxing - writing supplied
37 * data in a specified container format. It also has an @ref lavf_io
38 * "I/O module" which supports a number of protocols for accessing the data (e.g.
39 * file, tcp, http and others). Before using lavf, you need to call
40 * av_register_all() to register all compiled muxers, demuxers and protocols.
41 * Unless you are absolutely sure you won't use libavformat's network
42 * capabilities, you should also call avformat_network_init().
43 *
44 * A supported input format is described by an AVInputFormat struct, conversely
45 * an output format is described by AVOutputFormat. You can iterate over all
46 * registered input/output formats using the av_iformat_next() /
47 * av_oformat_next() functions. The protocols layer is not part of the public
48 * API, so you can only get the names of supported protocols with the
49 * avio_enum_protocols() function.
50 *
51 * Main lavf structure used for both muxing and demuxing is AVFormatContext,
52 * which exports all information about the file being read or written. As with
53 * most Libav structures, its size is not part of public ABI, so it cannot be
54 * allocated on stack or directly with av_malloc(). To create an
55 * AVFormatContext, use avformat_alloc_context() (some functions, like
56 * avformat_open_input() might do that for you).
57 *
58 * Most importantly an AVFormatContext contains:
59 * @li the @ref AVFormatContext.iformat "input" or @ref AVFormatContext.oformat
60 * "output" format. It is either autodetected or set by user for input;
61 * always set by user for output.
62 * @li an @ref AVFormatContext.streams "array" of AVStreams, which describe all
63 * elementary streams stored in the file. AVStreams are typically referred to
64 * using their index in this array.
65 * @li an @ref AVFormatContext.pb "I/O context". It is either opened by lavf or
66 * set by user for input, always set by user for output (unless you are dealing
67 * with an AVFMT_NOFILE format).
68 *
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69 * @defgroup lavf_decoding Demuxing
70 * @{
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71 * Demuxers read a media file and split it into chunks of data (@em packets). A
72 * @ref AVPacket "packet" contains one or more frames which belong a single
73 * elementary stream. In lavf API this process is represented by the
74 * avformat_open_input() function for opening a file, av_read_frame() for
75 * reading a single packet and finally avformat_close_input(), which does the
76 * cleanup.
77 *
78 * @section lavf_decoding_open Opening a media file
79 * The minimum information required to open a file is its URL or filename, which
80 * is passed to avformat_open_input(), as in the following code:
81 * @code
82 * const char *url = "in.mp3";
83 * AVFormatContext *s = NULL;
84 * int ret = avformat_open_input(&s, url, NULL, NULL);
85 * if (ret < 0)
86 * abort();
87 * @endcode
88 * The above code attempts to allocate an AVFormatContext, open the
89 * specified file (autodetecting the format) and read the header, exporting the
90 * information stored there into s. Some formats do not have a header or do not
91 * store enough information there, so it is recommended that you call the
92 * avformat_find_stream_info() function which tries to read and decode a few
93 * frames to find missing information.
94 *
95 * In some cases you might want to preallocate an AVFormatContext yourself with
96 * avformat_alloc_context() and do some tweaking on it before passing it to
97 * avformat_open_input(). One such case is when you want to use custom functions
98 * for reading input data instead of lavf internal I/O layer.
99 * To do that, create your own AVIOContext with avio_alloc_context(), passing
100 * your reading callbacks to it. Then set the @em pb field of your
101 * AVFormatContext to newly created AVIOContext.
102 *
103 * After you have finished reading the file, you must close it with
104 * avformat_close_input(). It will free everything associated with the file.
105 *
106 * @section lavf_decoding_read Reading from an opened file
107 *
108 * @section lavf_decoding_seek Seeking
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109 * @}
110 *
111 * @defgroup lavf_encoding Muxing
112 * @{
113 * @}
114 *
e4f4a1f9 115 * @defgroup lavf_io I/O Read/Write
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116 * @{
117 * @}
118 *
119 * @defgroup lavf_codec Demuxers
120 * @{
121 * @defgroup lavf_codec_native Native Demuxers
122 * @{
123 * @}
124 * @defgroup lavf_codec_wrappers External library wrappers
125 * @{
126 * @}
127 * @}
128 * @defgroup lavf_protos I/O Protocols
129 * @{
130 * @}
131 * @defgroup lavf_internal Internal
132 * @{
133 * @}
134 * @}
135 *
136 */
072e3efd 137
f71869a4 138#include <time.h>
67070e4f 139#include <stdio.h> /* FILE */
76a448ed 140#include "libavcodec/avcodec.h"
d9f80ea2 141#include "libavutil/dict.h"
abc78a5a 142#include "libavutil/log.h"
de6d9b64 143
de6d9b64 144#include "avio.h"
50196a98 145#include "libavformat/version.h"
de6d9b64 146
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147struct AVFormatContext;
148
a6d18a0e 149
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150/**
151 * @defgroup metadata_api Public Metadata API
152 * @{
b262a059 153 * @ingroup libavf
ea29242c 154 * The metadata API allows libavformat to export metadata tags to a client
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155 * application when demuxing. Conversely it allows a client application to
156 * set metadata when muxing.
157 *
158 * Metadata is exported or set as pairs of key/value strings in the 'metadata'
159 * fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
160 * using the @ref lavu_dict "AVDictionary" API. Like all strings in Libav,
161 * metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
61648423 162 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
28b4c06b 163 *
ea29242c 164 * Important concepts to keep in mind:
1a53a438 165 * - Keys are unique; there can never be 2 tags with the same key. This is
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166 * also meant semantically, i.e., a demuxer should not knowingly produce
167 * several keys that are literally different but semantically identical.
168 * E.g., key=Author5, key=Author6. In this example, all authors must be
169 * placed in the same tag.
1a53a438 170 * - Metadata is flat, not hierarchical; there are no subtags. If you
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171 * want to store, e.g., the email address of the child of producer Alice
172 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
1a53a438 173 * - Several modifiers can be applied to the tag name. This is done by
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174 * appending a dash character ('-') and the modifier name in the order
175 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
1a53a438 176 * - language -- a tag whose value is localized for a particular language
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177 * is appended with the ISO 639-2/B 3-letter language code.
178 * For example: Author-ger=Michael, Author-eng=Mike
179 * The original/default language is in the unqualified "Author" tag.
180 * A demuxer should set a default if it sets any translated tag.
1a53a438 181 * - sorting -- a modified version of a tag that should be used for
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182 * sorting will have '-sort' appended. E.g. artist="The Beatles",
183 * artist-sort="Beatles, The".
184 *
1a53a438 185 * - Demuxers attempt to export metadata in a generic format, however tags
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186 * with no generic equivalents are left as they are stored in the container.
187 * Follows a list of generic tag names:
ca76a119 188 *
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189 @verbatim
190 album -- name of the set this work belongs to
191 album_artist -- main creator of the set/album, if different from artist.
192 e.g. "Various Artists" for compilation albums.
193 artist -- main creator of the work
194 comment -- any additional description of the file.
195 composer -- who composed the work, if different from artist.
196 copyright -- name of copyright holder.
197 creation_time-- date when the file was created, preferably in ISO 8601.
198 date -- date when the work was created, preferably in ISO 8601.
199 disc -- number of a subset, e.g. disc in a multi-disc collection.
200 encoder -- name/settings of the software/hardware that produced the file.
201 encoded_by -- person/group who created the file.
202 filename -- original name of the file.
203 genre -- <self-evident>.
204 language -- main language in which the work is performed, preferably
205 in ISO 639-2 format. Multiple languages can be specified by
206 separating them with commas.
207 performer -- artist who performed the work, if different from artist.
208 E.g for "Also sprach Zarathustra", artist would be "Richard
209 Strauss" and performer "London Philharmonic Orchestra".
210 publisher -- name of the label/publisher.
211 service_name -- name of the service in broadcasting (channel name).
212 service_provider -- name of the service provider in broadcasting.
213 title -- name of the work.
214 track -- number of this work in the set, can be in form current/total.
215 variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
216 @endverbatim
217 *
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218 * Look in the examples section for an application example how to use the Metadata API.
219 *
1a53a438 220 * @}
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221 */
222
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223/* packet functions */
224
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225
226/**
49bd8e4b 227 * Allocate and read the payload of a packet and initialize its
d1b9adf2 228 * fields with default values.
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229 *
230 * @param pkt packet
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231 * @param size desired payload size
232 * @return >0 (read size) if OK, AVERROR_xxx otherwise
3217cb42 233 */
ae628ec1 234int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
3217cb42 235
de6d9b64 236
6bfc2683 237/**
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238 * Read data and append it to the current content of the AVPacket.
239 * If pkt->size is 0 this is identical to av_get_packet.
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240 * Note that this uses av_grow_packet and thus involves a realloc
241 * which is inefficient. Thus this function should only be used
242 * when there is no reasonable way to know (an upper bound of)
243 * the final size.
244 *
245 * @param pkt packet
246 * @param size amount of data to read
247 * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
248 * will not be lost even if an error occurs.
249 */
ae628ec1 250int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
6bfc2683 251
de6d9b64 252/*************************************************/
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253/* fractional numbers for exact pts handling */
254
671adb17 255/**
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256 * The exact value of the fractional number is: 'val + num / den'.
257 * num is assumed to be 0 <= num < den.
4c08b2bd 258 */
916c80e9 259typedef struct AVFrac {
115329f1 260 int64_t val, num, den;
52e57500 261} AVFrac;
916c80e9 262
916c80e9 263/*************************************************/
b9a281db 264/* input/output formats */
de6d9b64 265
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266struct AVCodecTag;
267
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268/**
269 * This structure contains the data a format has to probe a file.
270 */
b9a281db 271typedef struct AVProbeData {
5c91a675 272 const char *filename;
e5f58f81 273 unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
274 int buf_size; /**< Size of buf except extra allocated bytes */
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275} AVProbeData;
276
22e77e44 277#define AVPROBE_SCORE_MAX 100 ///< maximum score, half of that is used for file-extension-based detection
87e87886 278#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
de6d9b64 279
c68fafe0 280/// Demuxer will use avio_open, no opened file should be provided by the caller.
40d9c544 281#define AVFMT_NOFILE 0x0001
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282#define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
283#define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
284#define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
285 raw picture data. */
286#define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
287#define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
288#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
58ec7e00 289#define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
25918212 290#define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
ab5a0175 291#define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
bb62d5c1 292#define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
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293#define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fallback to binary search via read_timestamp */
294#define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fallback to generic search */
b631fba9 295#define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
f1caf01d 296#define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
b9a281db 297
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298/**
299 * @addtogroup lavf_encoding
300 * @{
301 */
b9a281db 302typedef struct AVOutputFormat {
de6d9b64 303 const char *name;
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304 /**
305 * Descriptive name for the format, meant to be more human-readable
819174fa 306 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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307 * to define it.
308 */
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309 const char *long_name;
310 const char *mime_type;
4f57fa8c 311 const char *extensions; /**< comma-separated filename extensions */
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312 /**
313 * size of private data so that it can be allocated in the wrapper
314 */
b9a281db 315 int priv_data_size;
de6d9b64 316 /* output support */
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317 enum CodecID audio_codec; /**< default audio codec */
318 enum CodecID video_codec; /**< default video codec */
de6d9b64 319 int (*write_header)(struct AVFormatContext *);
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320 /**
321 * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
322 * pkt can be NULL in order to flush data buffered in the muxer.
323 * When flushing, return 0 if there still is more data to flush,
324 * or 1 if everything was flushed and there is no more buffered
325 * data.
326 */
e928649b 327 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 328 int (*write_trailer)(struct AVFormatContext *);
76c56376 329 /**
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330 * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
331 * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
f1caf01d 332 * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH
76c56376 333 */
b9a281db 334 int flags;
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335 /**
336 * Currently only used to set pixel format if not YUV420P.
337 */
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338 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
339 AVPacket *in, int flush);
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340
341 /**
78cb7273 342 * List of supported codec_id-codec_tag pairs, ordered by "better
22e77e44 343 * choice first". The arrays are all terminated by CODEC_ID_NONE.
7caf0cc6 344 */
c1854592 345 const struct AVCodecTag * const *codec_tag;
7caf0cc6 346
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347 enum CodecID subtitle_codec; /**< default subtitle codec */
348
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349 const AVClass *priv_class; ///< AVClass for the private context
350
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351 /**
352 * Test if the given codec can be stored in this container.
353 *
354 * @return 1 if the codec is supported, 0 if it is not.
355 * A negative number if unknown.
356 */
357 int (*query_codec)(enum CodecID id, int std_compliance);
358
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359 /* private fields */
360 struct AVOutputFormat *next;
361} AVOutputFormat;
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362/**
363 * @}
364 */
de6d9b64 365
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366/**
367 * @addtogroup lavf_decoding
368 * @{
369 */
b9a281db 370typedef struct AVInputFormat {
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371 /**
372 * A comma separated list of short names for the format. New names
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373 * may be appended with a minor bump.
374 */
b9a281db 375 const char *name;
76c56376 376
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377 /**
378 * Descriptive name for the format, meant to be more human-readable
819174fa 379 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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380 * to define it.
381 */
b9a281db 382 const char *long_name;
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383
384 /**
385 * Size of private data so that it can be allocated in the wrapper.
386 */
b9a281db 387 int priv_data_size;
76c56376 388
65d7d68b 389 /**
22e77e44 390 * Tell if a given file has a chance of being parsed as this format.
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391 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
392 * big so you do not have to check for that unless you need more.
65d7d68b 393 */
b9a281db 394 int (*read_probe)(AVProbeData *);
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395
396 /**
397 * Read the format header and initialize the AVFormatContext
398 * structure. Return 0 if OK. 'ap' if non-NULL contains
399 * additional parameters. Only used in raw format right
400 * now. 'av_new_stream' should be called to create new streams.
401 */
6e9651d1 402 int (*read_header)(struct AVFormatContext *);
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403
404 /**
405 * Read one packet and put it in 'pkt'. pts and flags are also
406 * set. 'av_new_stream' can be called only if the flag
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407 * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
408 * background thread).
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409 * @return 0 on success, < 0 on error.
410 * When returning an error, pkt must not have been allocated
411 * or must be freed before returning
412 */
de6d9b64 413 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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414
415 /**
416 * Close the stream. The AVFormatContext and AVStreams are not
417 * freed by this function
418 */
de6d9b64 419 int (*read_close)(struct AVFormatContext *);
1de2db8f 420
115329f1 421 /**
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422 * Seek to a given timestamp relative to the frames in
423 * stream component stream_index.
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424 * @param stream_index Must not be -1.
425 * @param flags Selects which direction should be preferred if no exact
426 * match is available.
05ce0f11 427 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 428 */
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429 int (*read_seek)(struct AVFormatContext *,
430 int stream_index, int64_t timestamp, int flags);
431
8d14a25c 432 /**
58c42af7 433 * Get the next timestamp in stream[stream_index].time_base units.
d9526386 434 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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435 */
436 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
437 int64_t *pos, int64_t pos_limit);
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438
439 /**
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440 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
441 * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
b631fba9 442 * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK.
76c56376 443 */
de6d9b64 444 int flags;
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445
446 /**
447 * If extensions are defined, then no probe is done. You should
448 * usually not use extension format guessing because it is not
449 * reliable enough
450 */
b9a281db 451 const char *extensions;
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452
453 /**
454 * General purpose read-only value that the format can use.
455 */
b9a281db 456 int value;
fb2758c8 457
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458 /**
459 * Start/resume playing - only meaningful if using a network-based format
460 * (RTSP).
461 */
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462 int (*read_play)(struct AVFormatContext *);
463
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464 /**
465 * Pause playing - only meaningful if using a network-based format
466 * (RTSP).
467 */
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468 int (*read_pause)(struct AVFormatContext *);
469
c1854592 470 const struct AVCodecTag * const *codec_tag;
7caf0cc6 471
1de2db8f 472 /**
49bd8e4b 473 * Seek to timestamp ts.
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474 * Seeking will be done so that the point from which all active streams
475 * can be presented successfully will be closest to ts and within min/max_ts.
476 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
477 */
882fb0a3 478 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1de2db8f 479
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480 const AVClass *priv_class; ///< AVClass for the private context
481
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482 /* private fields */
483 struct AVInputFormat *next;
484} AVInputFormat;
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485/**
486 * @}
487 */
de6d9b64 488
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489enum AVStreamParseType {
490 AVSTREAM_PARSE_NONE,
491 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
4f57fa8c 492 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
78cb7273 493 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
74a6df59 494 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
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495};
496
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497typedef struct AVIndexEntry {
498 int64_t pos;
499 int64_t timestamp;
500#define AVINDEX_KEYFRAME 0x0001
30a43f2d 501 int flags:2;
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502 int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
503 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
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504} AVIndexEntry;
505
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506#define AV_DISPOSITION_DEFAULT 0x0001
507#define AV_DISPOSITION_DUB 0x0002
508#define AV_DISPOSITION_ORIGINAL 0x0004
509#define AV_DISPOSITION_COMMENT 0x0008
510#define AV_DISPOSITION_LYRICS 0x0010
511#define AV_DISPOSITION_KARAOKE 0x0020
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512
513/**
514 * Track should be used during playback by default.
515 * Useful for subtitle track that should be displayed
516 * even when user did not explicitly ask for subtitles.
517 */
7a617a86 518#define AV_DISPOSITION_FORCED 0x0040
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519#define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
520#define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
24a83bd1 521#define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
90c2295b 522
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523/**
524 * Stream structure.
525 * New fields can be added to the end with minor version bumps.
8bfb108b 526 * Removal, reordering and changes to existing fields require a major
ba66ae94 527 * version bump.
8bfb108b 528 * sizeof(AVStream) must not be used outside libav*.
ba66ae94 529 */
de6d9b64 530typedef struct AVStream {
43d414ba 531 int index; /**< stream index in AVFormatContext */
4f57fa8c 532 int id; /**< format-specific stream ID */
43d414ba 533 AVCodecContext *codec; /**< codec context */
b4b87d48 534 /**
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535 * Real base framerate of the stream.
536 * This is the lowest framerate with which all timestamps can be
864ff8c1 537 * represented accurately (it is the least common multiple of all
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538 * framerates in the stream). Note, this value is just a guess!
539 * For example, if the time base is 1/90000 and all frames have either
4f57fa8c 540 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
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541 */
542 AVRational r_frame_rate;
de6d9b64 543 void *priv_data;
82583548 544
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545 /**
546 * encoding: pts generation when outputting stream
547 */
a9fd2b19 548 struct AVFrac pts;
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549
550 /**
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551 * This is the fundamental unit of time (in seconds) in terms
552 * of which frame timestamps are represented. For fixed-fps content,
22e77e44 553 * time base should be 1/framerate and timestamp increments should be 1.
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554 * decoding: set by libavformat
555 * encoding: set by libavformat in av_write_header
5b28c8c3 556 */
9ee91c2f 557 AVRational time_base;
4f57fa8c 558 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
76c56376 559
6d96a9b9 560 /**
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561 * Decoding: pts of the first frame of the stream, in stream time base.
562 * Only set this if you are absolutely 100% sure that the value you set
563 * it to really is the pts of the first frame.
4854c253 564 * This may be undefined (AV_NOPTS_VALUE).
6d96a9b9 565 */
115329f1 566 int64_t start_time;
76c56376 567
e26381b6 568 /**
8bfb108b 569 * Decoding: duration of the stream, in stream time base.
e26381b6 570 * If a source file does not specify a duration, but does specify
4f57fa8c 571 * a bitrate, this value will be estimated from bitrate and file size.
e26381b6 572 */
ee404803 573 int64_t duration;
fb2758c8 574
b4b87d48 575 int64_t nb_frames; ///< number of frames in this stream if known or 0
504ee036 576
4f57fa8c 577 int disposition; /**< AV_DISPOSITION_* bit field */
0bef08e5 578
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579 /**
580 * sample aspect ratio (0 if unknown)
581 * - encoding: Set by user.
582 * - decoding: Set by libavformat.
583 */
584 AVRational sample_aspect_ratio;
f526adaf 585
d2d67e42 586 AVDictionary *metadata;
3a41c2f7 587
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588 /**
589 * Average framerate
590 */
591 AVRational avg_frame_rate;
6c6e6ef5 592
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593 /*****************************************************************
594 * All fields below this line are not part of the public API. They
595 * may not be used outside of libavformat and can be changed and
596 * removed at will.
597 * New public fields should be added right above.
598 *****************************************************************
599 */
600
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601 /**
602 * Number of frames that have been demuxed during av_find_stream_info()
603 */
604 int codec_info_nb_frames;
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605
606 /**
da9cea77 607 * Stream information used internally by av_find_stream_info()
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608 */
609#define MAX_STD_TIMEBASES (60*12+5)
610 struct {
611 int64_t last_dts;
612 int64_t duration_gcd;
613 int duration_count;
614 double duration_error[MAX_STD_TIMEBASES];
615 int64_t codec_info_duration;
38a4be3f 616 int nb_decoded_frames;
fd0368e7 617 } *info;
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618 const uint8_t *cur_ptr;
619 int cur_len;
620 AVPacket cur_pkt;
621
622 // Timestamp generation support:
623 /**
624 * Timestamp corresponding to the last dts sync point.
625 *
626 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
627 * a DTS is received from the underlying container. Otherwise set to
628 * AV_NOPTS_VALUE by default.
629 */
630 int64_t reference_dts;
631 int64_t first_dts;
632 int64_t cur_dts;
633 int last_IP_duration;
634 int64_t last_IP_pts;
635
636 /**
637 * Number of packets to buffer for codec probing
638 */
639#define MAX_PROBE_PACKETS 2500
640 int probe_packets;
641
642 /**
643 * last packet in packet_buffer for this stream when muxing.
644 */
645 struct AVPacketList *last_in_packet_buffer;
646 AVProbeData probe_data;
647#define MAX_REORDER_DELAY 16
648 int64_t pts_buffer[MAX_REORDER_DELAY+1];
649 /* av_read_frame() support */
650 enum AVStreamParseType need_parsing;
651 struct AVCodecParserContext *parser;
652
653 AVIndexEntry *index_entries; /**< Only used if the format does not
654 support seeking natively. */
655 int nb_index_entries;
656 unsigned int index_entries_allocated_size;
657
658 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
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659} AVStream;
660
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661#define AV_PROGRAM_RUNNING 1
662
ba66ae94 663/**
ba66ae94 664 * New fields can be added to the end with minor version bumps.
8bfb108b 665 * Removal, reordering and changes to existing fields require a major
ba66ae94 666 * version bump.
8bfb108b 667 * sizeof(AVProgram) must not be used outside libav*.
ba66ae94 668 */
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669typedef struct AVProgram {
670 int id;
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671 int flags;
672 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
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673 unsigned int *stream_index;
674 unsigned int nb_stream_indexes;
d2d67e42 675 AVDictionary *metadata;
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676} AVProgram;
677
43d414ba 678#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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679 (streams are added dynamically) */
680
79d7836a 681typedef struct AVChapter {
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682 int id; ///< unique ID to identify the chapter
683 AVRational time_base; ///< time base in which the start/end timestamps are specified
8931e7b4 684 int64_t start, end; ///< chapter start/end time in time_base units
d2d67e42 685 AVDictionary *metadata;
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686} AVChapter;
687
252f17e2 688/**
4f57fa8c 689 * Format I/O context.
252f17e2 690 * New fields can be added to the end with minor version bumps.
8bfb108b 691 * Removal, reordering and changes to existing fields require a major
252f17e2 692 * version bump.
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693 * sizeof(AVFormatContext) must not be used outside libav*, use
694 * avformat_alloc_context() to create an AVFormatContext.
252f17e2 695 */
de6d9b64 696typedef struct AVFormatContext {
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697 /**
698 * A class for logging and AVOptions. Set by avformat_alloc_context().
699 * Exports (de)muxer private options if they exist.
700 */
701 const AVClass *av_class;
702
703 /**
704 * Can only be iformat or oformat, not both at the same time.
705 *
706 * decoding: set by avformat_open_input().
707 * encoding: set by the user.
708 */
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709 struct AVInputFormat *iformat;
710 struct AVOutputFormat *oformat;
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711
712 /**
713 * Format private data. This is an AVOptions-enabled struct
714 * if and only if iformat/oformat.priv_class is not NULL.
715 */
de6d9b64 716 void *priv_data;
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717
718 /*
719 * I/O context.
720 *
721 * decoding: either set by the user before avformat_open_input() (then
722 * the user must close it manually) or set by avformat_open_input().
723 * encoding: set by the user.
724 *
725 * Do NOT set this field if AVFMT_NOFILE flag is set in
726 * iformat/oformat.flags. In such a case, the (de)muxer will handle
727 * I/O in some other way and this field will be NULL.
728 */
ae628ec1 729 AVIOContext *pb;
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730
731 /**
732 * A list of all streams in the file. New streams are created with
733 * avformat_new_stream().
734 *
735 * decoding: streams are created by libavformat in avformat_open_input().
736 * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
737 * appear in av_read_frame().
738 * encoding: streams are created by the user before avformat_write_header().
739 */
db69c2e5 740 unsigned int nb_streams;
38aab35f 741 AVStream **streams;
83daced0 742
43d414ba 743 char filename[1024]; /**< input or output filename */
de6d9b64 744 /* stream info */
4f57fa8c 745 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
ee404803 746
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747 /**
748 * Decoding: position of the first frame of the component, in
749 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
750 * It is deduced from the AVStream values.
751 */
115329f1 752 int64_t start_time;
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753
754 /**
755 * Decoding: duration of the stream, in AV_TIME_BASE fractional
756 * seconds. Only set this value if you know none of the individual stream
da9cea77 757 * durations and also do not set any of them. This is deduced from the
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758 * AVStream values if not set.
759 */
ee404803 760 int64_t duration;
76c56376 761
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762 /**
763 * Decoding: total stream bitrate in bit/s, 0 if not
764 * available. Never set it directly if the file_size and the
6001dad6 765 * duration are known as Libav can compute it automatically.
76c56376 766 */
ee404803 767 int bit_rate;
fb2758c8 768
92400be2 769 unsigned int packet_size;
17c88cb0 770 int max_delay;
8108551a 771
30bc6613 772 int flags;
22e77e44 773#define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
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774#define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
775#define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
c55806e3 776#define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
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777#define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
778#define AVFMT_FLAG_NOPARSE 0x0020 ///< Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled
05e84c95 779#define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
73e8e8db 780#define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
5894e1bb 781
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782 /**
783 * decoding: size of data to probe; encoding: unused.
784 */
9e6c9470 785 unsigned int probesize;
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786
787 /**
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788 * decoding: maximum time (in AV_TIME_BASE units) during which the input should
789 * be analyzed in avformat_find_stream_info().
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790 */
791 int max_analyze_duration;
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792
793 const uint8_t *key;
794 int keylen;
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795
796 unsigned int nb_programs;
797 AVProgram **programs;
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798
799 /**
800 * Forced video codec_id.
4f57fa8c 801 * Demuxing: Set by user.
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802 */
803 enum CodecID video_codec_id;
76c56376 804
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805 /**
806 * Forced audio codec_id.
4f57fa8c 807 * Demuxing: Set by user.
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808 */
809 enum CodecID audio_codec_id;
76c56376 810
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811 /**
812 * Forced subtitle codec_id.
4f57fa8c 813 * Demuxing: Set by user.
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814 */
815 enum CodecID subtitle_codec_id;
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816
817 /**
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818 * Maximum amount of memory in bytes to use for the index of each stream.
819 * If the index exceeds this size, entries will be discarded as
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820 * needed to maintain a smaller size. This can lead to slower or less
821 * accurate seeking (depends on demuxer).
4f57fa8c 822 * Demuxers for which a full in-memory index is mandatory will ignore
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823 * this.
824 * muxing : unused
825 * demuxing: set by user
826 */
827 unsigned int max_index_size;
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828
829 /**
ffa71b2b 830 * Maximum amount of memory in bytes to use for buffering frames
4f57fa8c 831 * obtained from realtime capture devices.
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832 */
833 unsigned int max_picture_buffer;
79d7836a 834
fbabf1e9 835 unsigned int nb_chapters;
79d7836a 836 AVChapter **chapters;
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837
838 /**
4f57fa8c 839 * Flags to enable debugging.
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840 */
841 int debug;
842#define FF_FDEBUG_TS 0x0001
0bef08e5 843
d2d67e42 844 AVDictionary *metadata;
af122d6a 845
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846 /**
847 * Start time of the stream in real world time, in microseconds
848 * since the unix epoch (00:00 1st January 1970). That is, pts=0
849 * in the stream was captured at this real world time.
850 * - encoding: Set by user.
851 * - decoding: Unused.
852 */
853 int64_t start_time_realtime;
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854
855 /**
856 * decoding: number of frames used to probe fps
857 */
858 int fps_probe_size;
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859
860 /**
861 * Error recognition; higher values will detect more errors but may
862 * misdetect some more or less valid parts as errors.
863 * - encoding: unused
864 * - decoding: Set by user.
865 */
866 int error_recognition;
df968050 867
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868 /**
869 * Custom interrupt callbacks for the I/O layer.
870 *
871 * decoding: set by the user before avformat_open_input().
872 * encoding: set by the user before avformat_write_header()
873 * (mainly useful for AVFMT_NOFILE formats). The callback
874 * should also be passed to avio_open2() if it's used to
875 * open the file.
876 */
877 AVIOInterruptCB interrupt_callback;
878
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879 /*****************************************************************
880 * All fields below this line are not part of the public API. They
881 * may not be used outside of libavformat and can be changed and
882 * removed at will.
883 * New public fields should be added right above.
884 *****************************************************************
885 */
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886 /**
887 * Raw packets from the demuxer, prior to parsing and decoding.
888 * This buffer is used for buffering packets until the codec can
889 * be identified, as parsing cannot be done without knowing the
890 * codec.
891 */
892 struct AVPacketList *raw_packet_buffer;
893 struct AVPacketList *raw_packet_buffer_end;
894 /**
895 * Remaining size available for raw_packet_buffer, in bytes.
896 */
897#define RAW_PACKET_BUFFER_SIZE 2500000
898 int raw_packet_buffer_remaining_size;
899
900 /**
901 * This buffer is only needed when packets were already buffered but
902 * not decoded, for example to get the codec parameters in MPEG
903 * streams.
904 */
905 struct AVPacketList *packet_buffer;
906 struct AVPacketList *packet_buffer_end;
907
908 /* av_read_frame() support */
909 AVStream *cur_st;
910
911 /* av_seek_frame() support */
912 int64_t data_offset; /**< offset of the first packet */
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913} AVFormatContext;
914
915typedef struct AVPacketList {
916 AVPacket pkt;
917 struct AVPacketList *next;
918} AVPacketList;
919
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920
921/**
922 * @defgroup lavf_core Core functions
923 * @ingroup libavf
924 *
925 * Functions for querying libavformat capabilities, allocating core structures,
926 * etc.
927 * @{
928 */
929
930/**
931 * Return the LIBAVFORMAT_VERSION_INT constant.
932 */
933unsigned avformat_version(void);
934
935/**
936 * Return the libavformat build-time configuration.
937 */
938const char *avformat_configuration(void);
939
940/**
941 * Return the libavformat license.
942 */
943const char *avformat_license(void);
944
945/**
946 * Initialize libavformat and register all the muxers, demuxers and
947 * protocols. If you do not call this function, then you can select
948 * exactly which formats you want to support.
949 *
950 * @see av_register_input_format()
951 * @see av_register_output_format()
952 * @see av_register_protocol()
953 */
954void av_register_all(void);
955
956void av_register_input_format(AVInputFormat *format);
957void av_register_output_format(AVOutputFormat *format);
958
959/**
960 * Do global initialization of network components. This is optional,
961 * but recommended, since it avoids the overhead of implicitly
962 * doing the setup for each session.
963 *
964 * Calling this function will become mandatory if using network
965 * protocols at some major version bump.
966 */
967int avformat_network_init(void);
968
969/**
970 * Undo the initialization done by avformat_network_init.
971 */
972int avformat_network_deinit(void);
973
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974/**
975 * If f is NULL, returns the first registered input format,
22e77e44 976 * if f is non-NULL, returns the next registered input format after f
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977 * or NULL if f is the last one.
978 */
84be6e72 979AVInputFormat *av_iformat_next(AVInputFormat *f);
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980
981/**
982 * If f is NULL, returns the first registered output format,
22e77e44 983 * if f is non-NULL, returns the next registered output format after f
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984 * or NULL if f is the last one.
985 */
84be6e72 986AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 987
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988/**
989 * Allocate an AVFormatContext.
990 * avformat_free_context() can be used to free the context and everything
991 * allocated by the framework within it.
992 */
993AVFormatContext *avformat_alloc_context(void);
994
995/**
996 * Free an AVFormatContext and all its streams.
997 * @param s context to free
998 */
999void avformat_free_context(AVFormatContext *s);
1000
1001/**
1002 * Get the AVClass for AVFormatContext. It can be used in combination with
1003 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
1004 *
1005 * @see av_opt_find().
1006 */
1007const AVClass *avformat_get_class(void);
1008
1009/**
1010 * Add a new stream to a media file.
1011 *
1012 * When demuxing, it is called by the demuxer in read_header(). If the
1013 * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
1014 * be called in read_packet().
1015 *
1016 * When muxing, should be called by the user before avformat_write_header().
1017 *
1018 * @param c If non-NULL, the AVCodecContext corresponding to the new stream
1019 * will be initialized to use this codec. This is needed for e.g. codec-specific
1020 * defaults to be set, so codec should be provided if it is known.
1021 *
1022 * @return newly created stream or NULL on error.
1023 */
1024AVStream *avformat_new_stream(AVFormatContext *s, AVCodec *c);
1025
1026AVProgram *av_new_program(AVFormatContext *s, int id);
1027
1028/**
1029 * @}
1030 */
1031
1032
370f27de 1033/**
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1034 * @addtogroup lavf_decoding
1035 * @{
1036 */
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1037
1038/**
49bd8e4b 1039 * Find AVInputFormat based on the short name of the input format.
3217cb42 1040 */
b9a281db 1041AVInputFormat *av_find_input_format(const char *short_name);
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1042
1043/**
49bd8e4b 1044 * Guess the file format.
3217cb42 1045 *
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1046 * @param is_opened Whether the file is already opened; determines whether
1047 * demuxers with or without AVFMT_NOFILE are probed.
3217cb42 1048 */
94988531 1049AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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1050
1051/**
49bd8e4b 1052 * Guess the file format.
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1053 *
1054 * @param is_opened Whether the file is already opened; determines whether
1055 * demuxers with or without AVFMT_NOFILE are probed.
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1056 * @param score_max A probe score larger that this is required to accept a
1057 * detection, the variable is set to the actual detection
1058 * score afterwards.
1059 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
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1060 * to retry with a larger probe buffer.
1061 */
1062AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1063
1064/**
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1065 * Probe a bytestream to determine the input format. Each time a probe returns
1066 * with a score that is too low, the probe buffer size is increased and another
1067 * attempt is made. When the maximum probe size is reached, the input format
1068 * with the highest score is returned.
1069 *
1070 * @param pb the bytestream to probe
1071 * @param fmt the input format is put here
1072 * @param filename the filename of the stream
1073 * @param logctx the log context
1074 * @param offset the offset within the bytestream to probe from
1075 * @param max_probe_size the maximum probe buffer size (zero for default)
1076 * @return 0 in case of success, a negative value corresponding to an
1077 * AVERROR code otherwise
1078 */
ae628ec1 1079int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
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1080 const char *filename, void *logctx,
1081 unsigned int offset, unsigned int max_probe_size);
1082
88808c60 1083/**
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1084 * Open an input stream and read the header. The codecs are not opened.
1085 * The stream must be closed with av_close_input_file().
1086 *
1087 * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
1088 * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
1089 * function and written into ps.
1090 * Note that a user-supplied AVFormatContext will be freed on failure.
1091 * @param filename Name of the stream to open.
1092 * @param fmt If non-NULL, this parameter forces a specific input format.
1093 * Otherwise the format is autodetected.
1094 * @param options A dictionary filled with AVFormatContext and demuxer-private options.
1095 * On return this parameter will be destroyed and replaced with a dict containing
1096 * options that were not found. May be NULL.
1097 *
1098 * @return 0 on success, a negative AVERROR on failure.
1099 *
1100 * @note If you want to use custom IO, preallocate the format context and set its pb field.
1101 */
1102int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
1103
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1104/**
1105 * Read packets of a media file to get stream information. This
1106 * is useful for file formats with no headers such as MPEG. This
1107 * function also computes the real framerate in case of MPEG-2 repeat
1108 * frame mode.
1109 * The logical file position is not changed by this function;
1110 * examined packets may be buffered for later processing.
1111 *
1112 * @param ic media file handle
1113 * @param options If non-NULL, an ic.nb_streams long array of pointers to
1114 * dictionaries, where i-th member contains options for
1115 * codec corresponding to i-th stream.
1116 * On return each dictionary will be filled with options that were not found.
1117 * @return >=0 if OK, AVERROR_xxx on error
1118 *
1119 * @note this function isn't guaranteed to open all the codecs, so
1120 * options being non-empty at return is a perfectly normal behavior.
1121 *
1122 * @todo Let the user decide somehow what information is needed so that
1123 * we do not waste time getting stuff the user does not need.
1124 */
1125int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options);
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1126
1127/**
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1128 * Find the "best" stream in the file.
1129 * The best stream is determined according to various heuristics as the most
1130 * likely to be what the user expects.
1131 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1132 * default decoder for the stream's codec; streams for which no decoder can
1133 * be found are ignored.
1134 *
1135 * @param ic media file handle
1136 * @param type stream type: video, audio, subtitles, etc.
1137 * @param wanted_stream_nb user-requested stream number,
1138 * or -1 for automatic selection
1139 * @param related_stream try to find a stream related (eg. in the same
1140 * program) to this one, or -1 if none
1141 * @param decoder_ret if non-NULL, returns the decoder for the
1142 * selected stream
1143 * @param flags flags; none are currently defined
1144 * @return the non-negative stream number in case of success,
1145 * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1146 * could be found,
1147 * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1148 * @note If av_find_best_stream returns successfully and decoder_ret is not
1149 * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1150 */
1151int av_find_best_stream(AVFormatContext *ic,
1152 enum AVMediaType type,
1153 int wanted_stream_nb,
1154 int related_stream,
1155 AVCodec **decoder_ret,
1156 int flags);
1157
1158/**
49bd8e4b 1159 * Read a transport packet from a media file.
3217cb42 1160 *
864ff8c1 1161 * This function is obsolete and should never be used.
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1162 * Use av_read_frame() instead.
1163 *
1164 * @param s media file handle
1165 * @param pkt is filled
4f57fa8c 1166 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1167 */
de6d9b64 1168int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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1169
1170/**
49bd8e4b 1171 * Return the next frame of a stream.
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1172 * This function returns what is stored in the file, and does not validate
1173 * that what is there are valid frames for the decoder. It will split what is
1174 * stored in the file into frames and return one for each call. It will not
1175 * omit invalid data between valid frames so as to give the decoder the maximum
1176 * information possible for decoding.
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1177 *
1178 * The returned packet is valid
1179 * until the next av_read_frame() or until av_close_input_file() and
1180 * must be freed with av_free_packet. For video, the packet contains
1181 * exactly one frame. For audio, it contains an integer number of
1182 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1183 * data). If the audio frames have a variable size (e.g. MPEG audio),
1184 * then it contains one frame.
1185 *
1186 * pkt->pts, pkt->dts and pkt->duration are always set to correct
22e77e44 1187 * values in AVStream.time_base units (and guessed if the format cannot
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1188 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1189 * has B-frames, so it is better to rely on pkt->dts if you do not
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1190 * decompress the payload.
1191 *
4f57fa8c 1192 * @return 0 if OK, < 0 on error or end of file
3217cb42 1193 */
fb2758c8 1194int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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1195
1196/**
49bd8e4b 1197 * Seek to the keyframe at timestamp.
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1198 * 'timestamp' in 'stream_index'.
1199 * @param stream_index If stream_index is (-1), a default
1200 * stream is selected, and timestamp is automatically converted
1201 * from AV_TIME_BASE units to the stream specific time_base.
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1202 * @param timestamp Timestamp in AVStream.time_base units
1203 * or, if no stream is specified, in AV_TIME_BASE units.
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1204 * @param flags flags which select direction and seeking mode
1205 * @return >= 0 on success
1206 */
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1207int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1208 int flags);
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1209
1210/**
49bd8e4b 1211 * Seek to timestamp ts.
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1212 * Seeking will be done so that the point from which all active streams
1213 * can be presented successfully will be closest to ts and within min/max_ts.
1214 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1215 *
22e77e44 1216 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
d04768fa 1217 * are the file position (this may not be supported by all demuxers).
22e77e44 1218 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
d04768fa 1219 * in the stream with stream_index (this may not be supported by all demuxers).
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1220 * Otherwise all timestamps are in units of the stream selected by stream_index
1221 * or if stream_index is -1, in AV_TIME_BASE units.
1222 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
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1223 * keyframes (this may not be supported by all demuxers).
1224 *
22e77e44 1225 * @param stream_index index of the stream which is used as time base reference
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1226 * @param min_ts smallest acceptable timestamp
1227 * @param ts target timestamp
1228 * @param max_ts largest acceptable timestamp
1229 * @param flags flags
32e543f8 1230 * @return >=0 on success, error code otherwise
998b6f7c 1231 *
8a4d7a30 1232 * @note This is part of the new seek API which is still under construction.
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1233 * Thus do not use this yet. It may change at any time, do not expect
1234 * ABI compatibility yet!
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1235 */
1236int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1237
1238/**
49bd8e4b 1239 * Start playing a network-based stream (e.g. RTSP stream) at the
4f57fa8c 1240 * current position.
3217cb42 1241 */
fb2758c8 1242int av_read_play(AVFormatContext *s);
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1243
1244/**
49bd8e4b 1245 * Pause a network-based stream (e.g. RTSP stream).
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1246 *
1247 * Use av_read_play() to resume it.
1248 */
fb2758c8 1249int av_read_pause(AVFormatContext *s);
3217cb42 1250
52660454 1251#if FF_API_CLOSE_INPUT_FILE
2506fd54 1252/**
52660454 1253 * @deprecated use avformat_close_input()
49bd8e4b 1254 * Close a media file (but not its codecs).
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1255 *
1256 * @param s media file handle
1257 */
52660454 1258attribute_deprecated
de6d9b64 1259void av_close_input_file(AVFormatContext *s);
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1260#endif
1261
1262/**
1263 * Close an opened input AVFormatContext. Free it and all its contents
1264 * and set *s to NULL.
1265 */
1266void avformat_close_input(AVFormatContext **s);
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1267/**
1268 * @}
1269 */
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1271#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1272#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
4f57fa8c 1273#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
2bf74f49 1274#define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
3ba1438d 1275
3217cb42 1276/**
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1277 * @addtogroup lavf_encoding
1278 * @{
1279 */
f3bfe388 1280/**
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1281 * Allocate the stream private data and write the stream header to
1282 * an output media file.
1283 *
1284 * @param s Media file handle, must be allocated with avformat_alloc_context().
1285 * Its oformat field must be set to the desired output format;
1286 * Its pb field must be set to an already openened AVIOContext.
1287 * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
1288 * On return this parameter will be destroyed and replaced with a dict containing
1289 * options that were not found. May be NULL.
1290 *
1291 * @return 0 on success, negative AVERROR on failure.
1292 *
1293 * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
1294 */
1295int avformat_write_header(AVFormatContext *s, AVDictionary **options);
1296
3217cb42 1297/**
49bd8e4b 1298 * Write a packet to an output media file.
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1299 *
1300 * The packet shall contain one audio or video frame.
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1301 * The packet must be correctly interleaved according to the container
1302 * specification, if not then av_interleaved_write_frame must be used.
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1303 *
1304 * @param s media file handle
78cb7273 1305 * @param pkt The packet, which contains the stream_index, buf/buf_size,
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1306 * dts/pts, ...
1307 * This can be NULL (at any time, not just at the end), in
1308 * order to immediately flush data buffered within the muxer,
1309 * for muxers that buffer up data internally before writing it
1310 * to the output.
1311 * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
3217cb42 1312 */
e928649b 1313int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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1314
1315/**
49bd8e4b 1316 * Write a packet to an output media file ensuring correct interleaving.
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1317 *
1318 * The packet must contain one audio or video frame.
22e77e44 1319 * If the packets are already correctly interleaved, the application should
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1320 * call av_write_frame() instead as it is slightly faster. It is also important
1321 * to keep in mind that completely non-interleaved input will need huge amounts
1322 * of memory to interleave with this, so it is preferable to interleave at the
1323 * demuxer level.
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1324 *
1325 * @param s media file handle
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1326 * @param pkt The packet containing the data to be written. Libavformat takes
1327 * ownership of the data and will free it when it sees fit using the packet's
1328 * @ref AVPacket.destruct "destruct" field. The caller must not access the data
1329 * after this function returns, as it may already be freed.
1330 * Packet's @ref AVPacket.stream_index "stream_index" field must be set to the
1331 * index of the corresponding stream in @ref AVFormatContext.streams
1332 * "s.streams".
1333 * It is very strongly recommended that timing information (@ref AVPacket.pts
1334 * "pts", @ref AVPacket.dts "dts" @ref AVPacket.duration "duration") is set to
1335 * correct values.
1336 *
1337 * @return 0 on success, a negative AVERROR on error.
3217cb42 1338 */
3c895fc0 1339int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
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1340
1341/**
49bd8e4b 1342 * Interleave a packet per dts in an output media file.
3217cb42 1343 *
78cb7273 1344 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
22e77e44 1345 * function, so they cannot be used after it. Note that calling av_free_packet()
78cb7273 1346 * on them is still safe.
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1347 *
1348 * @param s media file handle
1349 * @param out the interleaved packet will be output here
9a58234f 1350 * @param pkt the input packet
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1351 * @param flush 1 if no further packets are available as input and all
1352 * remaining packets should be output
1353 * @return 1 if a packet was output, 0 if no packet could be output,
d9526386 1354 * < 0 if an error occurred
3217cb42 1355 */
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1356int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1357 AVPacket *pkt, int flush);
e928649b 1358
3217cb42 1359/**
49bd8e4b 1360 * Write the stream trailer to an output media file and free the
2b75bde6 1361 * file private data.
3217cb42 1362 *
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1363 * May only be called after a successful call to av_write_header.
1364 *
3217cb42 1365 * @param s media file handle
4f57fa8c 1366 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1367 */
b9a281db 1368int av_write_trailer(AVFormatContext *s);
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1369
1370/**
1371 * Return the output format in the list of registered output formats
1372 * which best matches the provided parameters, or return NULL if
1373 * there is no match.
1374 *
1375 * @param short_name if non-NULL checks if short_name matches with the
1376 * names of the registered formats
1377 * @param filename if non-NULL checks if filename terminates with the
1378 * extensions of the registered formats
1379 * @param mime_type if non-NULL checks if mime_type matches with the
1380 * MIME type of the registered formats
1381 */
1382AVOutputFormat *av_guess_format(const char *short_name,
1383 const char *filename,
1384 const char *mime_type);
1385
1386/**
1387 * Guess the codec ID based upon muxer and filename.
1388 */
1389enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
1390 const char *filename, const char *mime_type,
1391 enum AVMediaType type);
1392
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1393/**
1394 * @}
1395 */
de6d9b64 1396
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1397
1398/**
1399 * @defgroup lavf_misc Utility functions
1400 * @ingroup libavf
1401 * @{
1402 *
1403 * Miscelaneous utility functions related to both muxing and demuxing
1404 * (or neither).
1405 */
1406
1407/**
1408 * Send a nice hexadecimal dump of a buffer to the specified file stream.
1409 *
1410 * @param f The file stream pointer where the dump should be sent to.
1411 * @param buf buffer
1412 * @param size buffer size
1413 *
1414 * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
1415 */
1416void av_hex_dump(FILE *f, uint8_t *buf, int size);
1417
1418/**
1419 * Send a nice hexadecimal dump of a buffer to the log.
1420 *
1421 * @param avcl A pointer to an arbitrary struct of which the first field is a
1422 * pointer to an AVClass struct.
1423 * @param level The importance level of the message, lower values signifying
1424 * higher importance.
1425 * @param buf buffer
1426 * @param size buffer size
1427 *
1428 * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
1429 */
1430void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
1431
1432/**
1433 * Send a nice dump of a packet to the specified file stream.
1434 *
1435 * @param f The file stream pointer where the dump should be sent to.
1436 * @param pkt packet to dump
1437 * @param dump_payload True if the payload must be displayed, too.
1438 * @param st AVStream that the packet belongs to
1439 */
1440void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
1441
1442
1443/**
1444 * Send a nice dump of a packet to the log.
1445 *
1446 * @param avcl A pointer to an arbitrary struct of which the first field is a
1447 * pointer to an AVClass struct.
1448 * @param level The importance level of the message, lower values signifying
1449 * higher importance.
1450 * @param pkt packet to dump
1451 * @param dump_payload True if the payload must be displayed, too.
1452 * @param st AVStream that the packet belongs to
1453 */
1454void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
1455 AVStream *st);
1456
1457/**
1458 * Get the CodecID for the given codec tag tag.
1459 * If no codec id is found returns CODEC_ID_NONE.
1460 *
1461 * @param tags list of supported codec_id-codec_tag pairs, as stored
1462 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1463 */
1464enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
1465
1466/**
1467 * Get the codec tag for the given codec id id.
1468 * If no codec tag is found returns 0.
1469 *
1470 * @param tags list of supported codec_id-codec_tag pairs, as stored
1471 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1472 */
1473unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
1474
1475int av_find_default_stream_index(AVFormatContext *s);
1476
1477/**
1478 * Get the index for a specific timestamp.
1479 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1480 * to the timestamp which is <= the requested one, if backward
1481 * is 0, then it will be >=
1482 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1483 * @return < 0 if no such timestamp could be found
1484 */
1485int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1486
1487/**
1488 * Add an index entry into a sorted list. Update the entry if the list
1489 * already contains it.
1490 *
1491 * @param timestamp timestamp in the time base of the given stream
1492 */
1493int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1494 int size, int distance, int flags);
1495
1496
1497/**
1498 * Split a URL string into components.
1499 *
1500 * The pointers to buffers for storing individual components may be null,
1501 * in order to ignore that component. Buffers for components not found are
1502 * set to empty strings. If the port is not found, it is set to a negative
1503 * value.
1504 *
1505 * @param proto the buffer for the protocol
1506 * @param proto_size the size of the proto buffer
1507 * @param authorization the buffer for the authorization
1508 * @param authorization_size the size of the authorization buffer
1509 * @param hostname the buffer for the host name
1510 * @param hostname_size the size of the hostname buffer
1511 * @param port_ptr a pointer to store the port number in
1512 * @param path the buffer for the path
1513 * @param path_size the size of the path buffer
1514 * @param url the URL to split
1515 */
1516void av_url_split(char *proto, int proto_size,
1517 char *authorization, int authorization_size,
1518 char *hostname, int hostname_size,
1519 int *port_ptr,
1520 char *path, int path_size,
1521 const char *url);
1522
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1523
1524void av_dump_format(AVFormatContext *ic,
1525 int index,
1526 const char *url,
1527 int is_output);
3217cb42 1528
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1529/**
1530 * Get the current time in microseconds.
1531 */
0c1a9eda 1532int64_t av_gettime(void);
94988531 1533
3217cb42 1534/**
49bd8e4b 1535 * Return in 'buf' the path with '%d' replaced by a number.
4f57fa8c 1536 *
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1537 * Also handles the '%0nd' format where 'n' is the total number
1538 * of digits and '%%'.
1539 *
1540 * @param buf destination buffer
1541 * @param buf_size destination buffer size
1542 * @param path numbered sequence string
8ea0e802 1543 * @param number frame number
4f57fa8c 1544 * @return 0 if OK, -1 on format error
3217cb42 1545 */
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1546int av_get_frame_filename(char *buf, int buf_size,
1547 const char *path, int number);
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1548
1549/**
49bd8e4b 1550 * Check whether filename actually is a numbered sequence generator.
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1551 *
1552 * @param filename possible numbered sequence string
4f57fa8c 1553 * @return 1 if a valid numbered sequence string, 0 otherwise
3217cb42 1554 */
5c07cf53 1555int av_filename_number_test(const char *filename);
96baaa6a 1556
c5388c07 1557/**
49bd8e4b 1558 * Generate an SDP for an RTP session.
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1559 *
1560 * @param ac array of AVFormatContexts describing the RTP streams. If the
1561 * array is composed by only one context, such context can contain
1562 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1563 * all the contexts in the array (an AVCodecContext per RTP stream)
4f57fa8c 1564 * must contain only one AVStream.
8767b80f 1565 * @param n_files number of AVCodecContexts contained in ac
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1566 * @param buf buffer where the SDP will be stored (must be allocated by
1567 * the caller)
8767b80f 1568 * @param size the size of the buffer
4f57fa8c 1569 * @return 0 if OK, AVERROR_xxx on error
c5388c07 1570 */
c234d40b 1571int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
c3675dfe 1572
1a70d127 1573/**
49bd8e4b 1574 * Return a positive value if the given filename has one of the given
1a70d127
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1575 * extensions, 0 otherwise.
1576 *
1577 * @param extensions a comma-separated list of filename extensions
1578 */
1579int av_match_ext(const char *filename, const char *extensions);
1580
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1581/**
1582 * Test if the given container can store a codec.
1583 *
1584 * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
1585 *
1586 * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
1587 * A negative number if this information is not available.
1588 */
1589int avformat_query_codec(AVOutputFormat *ofmt, enum CodecID codec_id, int std_compliance);
1590
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1591/**
1592 * @}
1593 */
1594
98790382 1595#endif /* AVFORMAT_AVFORMAT_H */