avf: introduce nobuffer option
[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 * @section lavf_options Passing options to (de)muxers
70 * Lavf allows to configure muxers and demuxers using the @ref avoptions
71 * mechanism. Generic (format-independent) libavformat options are provided by
72 * AVFormatContext, they can be examined from a user program by calling
73 * av_opt_next() / av_opt_find() on an allocated AVFormatContext (or its AVClass
74 * from avformat_get_class()). Private (format-specific) options are provided by
75 * AVFormatContext.priv_data if and only if AVInputFormat.priv_class /
76 * AVOutputFormat.priv_class of the corresponding format struct is non-NULL.
77 * Further options may be provided by the @ref AVFormatContext.pb "I/O context",
78 * if its AVClass is non-NULL, and the protocols layer. See the discussion on
79 * nesting in @ref avoptions documentation to learn how to access those.
80 *
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81 * @defgroup lavf_decoding Demuxing
82 * @{
59826cab 83 * Demuxers read a media file and split it into chunks of data (@em packets). A
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84 * @ref AVPacket "packet" contains one or more encoded frames which belongs to a
85 * single elementary stream. In the lavf API this process is represented by the
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86 * avformat_open_input() function for opening a file, av_read_frame() for
87 * reading a single packet and finally avformat_close_input(), which does the
88 * cleanup.
89 *
90 * @section lavf_decoding_open Opening a media file
91 * The minimum information required to open a file is its URL or filename, which
92 * is passed to avformat_open_input(), as in the following code:
93 * @code
94 * const char *url = "in.mp3";
95 * AVFormatContext *s = NULL;
96 * int ret = avformat_open_input(&s, url, NULL, NULL);
97 * if (ret < 0)
98 * abort();
99 * @endcode
100 * The above code attempts to allocate an AVFormatContext, open the
101 * specified file (autodetecting the format) and read the header, exporting the
102 * information stored there into s. Some formats do not have a header or do not
103 * store enough information there, so it is recommended that you call the
104 * avformat_find_stream_info() function which tries to read and decode a few
105 * frames to find missing information.
106 *
107 * In some cases you might want to preallocate an AVFormatContext yourself with
108 * avformat_alloc_context() and do some tweaking on it before passing it to
109 * avformat_open_input(). One such case is when you want to use custom functions
110 * for reading input data instead of lavf internal I/O layer.
111 * To do that, create your own AVIOContext with avio_alloc_context(), passing
112 * your reading callbacks to it. Then set the @em pb field of your
113 * AVFormatContext to newly created AVIOContext.
114 *
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115 * Since the format of the opened file is in general not known until after
116 * avformat_open_input() has returned, it is not possible to set demuxer private
117 * options on a preallocated context. Instead, the options should be passed to
118 * avformat_open_input() wrapped in an AVDictionary:
119 * @code
120 * AVDictionary *options = NULL;
121 * av_dict_set(&options, "video_size", "640x480", 0);
122 * av_dict_set(&options, "pixel_format", "rgb24", 0);
123 *
124 * if (avformat_open_input(&s, url, NULL, &options) < 0)
125 * abort();
126 * av_dict_free(&options);
127 * @endcode
128 * This code passes the private options 'video_size' and 'pixel_format' to the
129 * demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
130 * cannot know how to interpret raw video data otherwise. If the format turns
131 * out to be something different than raw video, those options will not be
132 * recognized by the demuxer and therefore will not be applied. Such unrecognized
133 * options are then returned in the options dictionary (recognized options are
134 * consumed). The calling program can handle such unrecognized options as it
135 * wishes, e.g.
136 * @code
137 * AVDictionaryEntry *e;
138 * if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
139 * fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
140 * abort();
141 * }
142 * @endcode
143 *
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144 * After you have finished reading the file, you must close it with
145 * avformat_close_input(). It will free everything associated with the file.
146 *
147 * @section lavf_decoding_read Reading from an opened file
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148 * Reading data from an opened AVFormatContext is done by repeatedly calling
149 * av_read_frame() on it. Each call, if successful, will return an AVPacket
150 * containing encoded data for one AVStream, identified by
151 * AVPacket.stream_index. This packet may be passed straight into the libavcodec
152 * decoding functions avcodec_decode_video2(), avcodec_decode_audio4() or
153 * avcodec_decode_subtitle2() if the caller wishes to decode the data.
154 *
155 * AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be
156 * set if known. They may also be unset (i.e. AV_NOPTS_VALUE for
157 * pts/dts, 0 for duration) if the stream does not provide them. The timing
158 * information will be in AVStream.time_base units, i.e. it has to be
159 * multiplied by the timebase to convert them to seconds.
160 *
161 * The packet data belongs to the demuxer and is invalid after the next call to
162 * av_read_frame(). The user must free the packet with av_free_packet() before
163 * calling av_read_frame() again or closing the file.
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164 *
165 * @section lavf_decoding_seek Seeking
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166 * @}
167 *
168 * @defgroup lavf_encoding Muxing
169 * @{
170 * @}
171 *
e4f4a1f9 172 * @defgroup lavf_io I/O Read/Write
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173 * @{
174 * @}
175 *
176 * @defgroup lavf_codec Demuxers
177 * @{
178 * @defgroup lavf_codec_native Native Demuxers
179 * @{
180 * @}
181 * @defgroup lavf_codec_wrappers External library wrappers
182 * @{
183 * @}
184 * @}
185 * @defgroup lavf_protos I/O Protocols
186 * @{
187 * @}
188 * @defgroup lavf_internal Internal
189 * @{
190 * @}
191 * @}
192 *
193 */
072e3efd 194
f71869a4 195#include <time.h>
67070e4f 196#include <stdio.h> /* FILE */
76a448ed 197#include "libavcodec/avcodec.h"
d9f80ea2 198#include "libavutil/dict.h"
abc78a5a 199#include "libavutil/log.h"
de6d9b64 200
de6d9b64 201#include "avio.h"
50196a98 202#include "libavformat/version.h"
de6d9b64 203
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204#if FF_API_AV_GETTIME
205#include "libavutil/time.h"
206#endif
207
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208struct AVFormatContext;
209
a6d18a0e 210
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211/**
212 * @defgroup metadata_api Public Metadata API
213 * @{
b262a059 214 * @ingroup libavf
ea29242c 215 * The metadata API allows libavformat to export metadata tags to a client
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216 * application when demuxing. Conversely it allows a client application to
217 * set metadata when muxing.
218 *
219 * Metadata is exported or set as pairs of key/value strings in the 'metadata'
220 * fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
221 * using the @ref lavu_dict "AVDictionary" API. Like all strings in Libav,
222 * metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
61648423 223 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
28b4c06b 224 *
ea29242c 225 * Important concepts to keep in mind:
1a53a438 226 * - Keys are unique; there can never be 2 tags with the same key. This is
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227 * also meant semantically, i.e., a demuxer should not knowingly produce
228 * several keys that are literally different but semantically identical.
229 * E.g., key=Author5, key=Author6. In this example, all authors must be
230 * placed in the same tag.
1a53a438 231 * - Metadata is flat, not hierarchical; there are no subtags. If you
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232 * want to store, e.g., the email address of the child of producer Alice
233 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
1a53a438 234 * - Several modifiers can be applied to the tag name. This is done by
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235 * appending a dash character ('-') and the modifier name in the order
236 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
1a53a438 237 * - language -- a tag whose value is localized for a particular language
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238 * is appended with the ISO 639-2/B 3-letter language code.
239 * For example: Author-ger=Michael, Author-eng=Mike
240 * The original/default language is in the unqualified "Author" tag.
241 * A demuxer should set a default if it sets any translated tag.
1a53a438 242 * - sorting -- a modified version of a tag that should be used for
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243 * sorting will have '-sort' appended. E.g. artist="The Beatles",
244 * artist-sort="Beatles, The".
245 *
1a53a438 246 * - Demuxers attempt to export metadata in a generic format, however tags
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247 * with no generic equivalents are left as they are stored in the container.
248 * Follows a list of generic tag names:
ca76a119 249 *
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250 @verbatim
251 album -- name of the set this work belongs to
252 album_artist -- main creator of the set/album, if different from artist.
253 e.g. "Various Artists" for compilation albums.
254 artist -- main creator of the work
255 comment -- any additional description of the file.
256 composer -- who composed the work, if different from artist.
257 copyright -- name of copyright holder.
258 creation_time-- date when the file was created, preferably in ISO 8601.
259 date -- date when the work was created, preferably in ISO 8601.
260 disc -- number of a subset, e.g. disc in a multi-disc collection.
261 encoder -- name/settings of the software/hardware that produced the file.
262 encoded_by -- person/group who created the file.
263 filename -- original name of the file.
264 genre -- <self-evident>.
265 language -- main language in which the work is performed, preferably
266 in ISO 639-2 format. Multiple languages can be specified by
267 separating them with commas.
268 performer -- artist who performed the work, if different from artist.
269 E.g for "Also sprach Zarathustra", artist would be "Richard
270 Strauss" and performer "London Philharmonic Orchestra".
271 publisher -- name of the label/publisher.
272 service_name -- name of the service in broadcasting (channel name).
273 service_provider -- name of the service provider in broadcasting.
274 title -- name of the work.
275 track -- number of this work in the set, can be in form current/total.
276 variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
277 @endverbatim
278 *
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279 * Look in the examples section for an application example how to use the Metadata API.
280 *
1a53a438 281 * @}
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282 */
283
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284/* packet functions */
285
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286
287/**
49bd8e4b 288 * Allocate and read the payload of a packet and initialize its
d1b9adf2 289 * fields with default values.
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290 *
291 * @param pkt packet
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292 * @param size desired payload size
293 * @return >0 (read size) if OK, AVERROR_xxx otherwise
3217cb42 294 */
ae628ec1 295int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
3217cb42 296
de6d9b64 297
6bfc2683 298/**
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299 * Read data and append it to the current content of the AVPacket.
300 * If pkt->size is 0 this is identical to av_get_packet.
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301 * Note that this uses av_grow_packet and thus involves a realloc
302 * which is inefficient. Thus this function should only be used
303 * when there is no reasonable way to know (an upper bound of)
304 * the final size.
305 *
306 * @param pkt packet
307 * @param size amount of data to read
308 * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
309 * will not be lost even if an error occurs.
310 */
ae628ec1 311int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
6bfc2683 312
de6d9b64 313/*************************************************/
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314/* fractional numbers for exact pts handling */
315
671adb17 316/**
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317 * The exact value of the fractional number is: 'val + num / den'.
318 * num is assumed to be 0 <= num < den.
4c08b2bd 319 */
916c80e9 320typedef struct AVFrac {
115329f1 321 int64_t val, num, den;
52e57500 322} AVFrac;
916c80e9 323
916c80e9 324/*************************************************/
b9a281db 325/* input/output formats */
de6d9b64 326
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327struct AVCodecTag;
328
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329/**
330 * This structure contains the data a format has to probe a file.
331 */
b9a281db 332typedef struct AVProbeData {
5c91a675 333 const char *filename;
e5f58f81 334 unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
335 int buf_size; /**< Size of buf except extra allocated bytes */
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336} AVProbeData;
337
22e77e44 338#define AVPROBE_SCORE_MAX 100 ///< maximum score, half of that is used for file-extension-based detection
87e87886 339#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
de6d9b64 340
c68fafe0 341/// Demuxer will use avio_open, no opened file should be provided by the caller.
40d9c544 342#define AVFMT_NOFILE 0x0001
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343#define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
344#define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
345#define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
346 raw picture data. */
347#define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
348#define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
349#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
58ec7e00 350#define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
25918212 351#define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
ab5a0175 352#define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
bb62d5c1 353#define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
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354#define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fallback to binary search via read_timestamp */
355#define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fallback to generic search */
b631fba9 356#define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
f1caf01d 357#define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
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358#define AVFMT_TS_NONSTRICT 0x20000 /**< Format does not require strictly
359 increasing timestamps, but they must
360 still be monotonic */
b9a281db 361
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362/**
363 * @addtogroup lavf_encoding
364 * @{
365 */
b9a281db 366typedef struct AVOutputFormat {
de6d9b64 367 const char *name;
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368 /**
369 * Descriptive name for the format, meant to be more human-readable
819174fa 370 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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371 * to define it.
372 */
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373 const char *long_name;
374 const char *mime_type;
4f57fa8c 375 const char *extensions; /**< comma-separated filename extensions */
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376 /* output support */
377 enum CodecID audio_codec; /**< default audio codec */
378 enum CodecID video_codec; /**< default video codec */
379 enum CodecID subtitle_codec; /**< default subtitle codec */
380 /**
381 * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
382 * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
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383 * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH,
384 * AVFMT_TS_NONSTRICT
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385 */
386 int flags;
387
388 /**
389 * List of supported codec_id-codec_tag pairs, ordered by "better
390 * choice first". The arrays are all terminated by CODEC_ID_NONE.
391 */
392 const struct AVCodecTag * const *codec_tag;
393
394
395 const AVClass *priv_class; ///< AVClass for the private context
396
397 /*****************************************************************
398 * No fields below this line are part of the public API. They
399 * may not be used outside of libavformat and can be changed and
400 * removed at will.
401 * New public fields should be added right above.
402 *****************************************************************
403 */
404 struct AVOutputFormat *next;
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405 /**
406 * size of private data so that it can be allocated in the wrapper
407 */
b9a281db 408 int priv_data_size;
183eaa9a 409
de6d9b64 410 int (*write_header)(struct AVFormatContext *);
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411 /**
412 * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
413 * pkt can be NULL in order to flush data buffered in the muxer.
414 * When flushing, return 0 if there still is more data to flush,
415 * or 1 if everything was flushed and there is no more buffered
416 * data.
417 */
e928649b 418 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 419 int (*write_trailer)(struct AVFormatContext *);
76c56376 420 /**
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421 * Currently only used to set pixel format if not YUV420P.
422 */
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423 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
424 AVPacket *in, int flush);
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425 /**
426 * Test if the given codec can be stored in this container.
427 *
428 * @return 1 if the codec is supported, 0 if it is not.
429 * A negative number if unknown.
430 */
431 int (*query_codec)(enum CodecID id, int std_compliance);
b9a281db 432} AVOutputFormat;
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433/**
434 * @}
435 */
de6d9b64 436
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437/**
438 * @addtogroup lavf_decoding
439 * @{
440 */
b9a281db 441typedef struct AVInputFormat {
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442 /**
443 * A comma separated list of short names for the format. New names
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444 * may be appended with a minor bump.
445 */
b9a281db 446 const char *name;
76c56376 447
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448 /**
449 * Descriptive name for the format, meant to be more human-readable
819174fa 450 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
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451 * to define it.
452 */
b9a281db 453 const char *long_name;
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454
455 /**
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456 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
457 * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
458 * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK.
459 */
460 int flags;
461
462 /**
463 * If extensions are defined, then no probe is done. You should
464 * usually not use extension format guessing because it is not
465 * reliable enough
466 */
467 const char *extensions;
468
469 const struct AVCodecTag * const *codec_tag;
470
471 const AVClass *priv_class; ///< AVClass for the private context
472
473 /*****************************************************************
474 * No fields below this line are part of the public API. They
475 * may not be used outside of libavformat and can be changed and
476 * removed at will.
477 * New public fields should be added right above.
478 *****************************************************************
479 */
480 struct AVInputFormat *next;
481
482 /**
f7fe41a0 483 * Raw demuxers store their codec ID here.
183eaa9a 484 */
f7fe41a0 485 int raw_codec_id;
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486
487 /**
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488 * Size of private data so that it can be allocated in the wrapper.
489 */
b9a281db 490 int priv_data_size;
76c56376 491
65d7d68b 492 /**
22e77e44 493 * Tell if a given file has a chance of being parsed as this format.
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494 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
495 * big so you do not have to check for that unless you need more.
65d7d68b 496 */
b9a281db 497 int (*read_probe)(AVProbeData *);
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498
499 /**
500 * Read the format header and initialize the AVFormatContext
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501 * structure. Return 0 if OK. Only used in raw format right
502 * now. 'avformat_new_stream' should be called to create new streams.
76c56376 503 */
6e9651d1 504 int (*read_header)(struct AVFormatContext *);
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505
506 /**
507 * Read one packet and put it in 'pkt'. pts and flags are also
6b8b0fe2 508 * set. 'avformat_new_stream' can be called only if the flag
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509 * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
510 * background thread).
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511 * @return 0 on success, < 0 on error.
512 * When returning an error, pkt must not have been allocated
513 * or must be freed before returning
514 */
de6d9b64 515 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
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516
517 /**
518 * Close the stream. The AVFormatContext and AVStreams are not
519 * freed by this function
520 */
de6d9b64 521 int (*read_close)(struct AVFormatContext *);
1de2db8f 522
115329f1 523 /**
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524 * Seek to a given timestamp relative to the frames in
525 * stream component stream_index.
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526 * @param stream_index Must not be -1.
527 * @param flags Selects which direction should be preferred if no exact
528 * match is available.
05ce0f11 529 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 530 */
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531 int (*read_seek)(struct AVFormatContext *,
532 int stream_index, int64_t timestamp, int flags);
533
8d14a25c 534 /**
58c42af7 535 * Get the next timestamp in stream[stream_index].time_base units.
d9526386 536 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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537 */
538 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
539 int64_t *pos, int64_t pos_limit);
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540
541 /**
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542 * Start/resume playing - only meaningful if using a network-based format
543 * (RTSP).
544 */
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545 int (*read_play)(struct AVFormatContext *);
546
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547 /**
548 * Pause playing - only meaningful if using a network-based format
549 * (RTSP).
550 */
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551 int (*read_pause)(struct AVFormatContext *);
552
1de2db8f 553 /**
49bd8e4b 554 * Seek to timestamp ts.
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555 * Seeking will be done so that the point from which all active streams
556 * can be presented successfully will be closest to ts and within min/max_ts.
557 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
558 */
882fb0a3 559 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
b9a281db 560} AVInputFormat;
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561/**
562 * @}
563 */
de6d9b64 564
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565enum AVStreamParseType {
566 AVSTREAM_PARSE_NONE,
567 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
4f57fa8c 568 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
78cb7273 569 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
74a6df59 570 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
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571};
572
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573typedef struct AVIndexEntry {
574 int64_t pos;
575 int64_t timestamp;
576#define AVINDEX_KEYFRAME 0x0001
30a43f2d 577 int flags:2;
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578 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).
579 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
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580} AVIndexEntry;
581
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582#define AV_DISPOSITION_DEFAULT 0x0001
583#define AV_DISPOSITION_DUB 0x0002
584#define AV_DISPOSITION_ORIGINAL 0x0004
585#define AV_DISPOSITION_COMMENT 0x0008
586#define AV_DISPOSITION_LYRICS 0x0010
587#define AV_DISPOSITION_KARAOKE 0x0020
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588
589/**
590 * Track should be used during playback by default.
591 * Useful for subtitle track that should be displayed
592 * even when user did not explicitly ask for subtitles.
593 */
7a617a86 594#define AV_DISPOSITION_FORCED 0x0040
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595#define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
596#define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
24a83bd1 597#define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
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598/**
599 * The stream is stored in the file as an attached picture/"cover art" (e.g.
600 * APIC frame in ID3v2). The single packet associated with it will be returned
601 * among the first few packets read from the file unless seeking takes place.
602 * It can also be accessed at any time in AVStream.attached_pic.
603 */
604#define AV_DISPOSITION_ATTACHED_PIC 0x0400
90c2295b 605
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606/**
607 * Stream structure.
608 * New fields can be added to the end with minor version bumps.
8bfb108b 609 * Removal, reordering and changes to existing fields require a major
ba66ae94 610 * version bump.
8bfb108b 611 * sizeof(AVStream) must not be used outside libav*.
ba66ae94 612 */
de6d9b64 613typedef struct AVStream {
43d414ba 614 int index; /**< stream index in AVFormatContext */
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615 /**
616 * Format-specific stream ID.
617 * decoding: set by libavformat
618 * encoding: set by the user
619 */
620 int id;
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621 /**
622 * Codec context associated with this stream. Allocated and freed by
623 * libavformat.
624 *
625 * - decoding: The demuxer exports codec information stored in the headers
626 * here.
627 * - encoding: The user sets codec information, the muxer writes it to the
628 * output. Mandatory fields as specified in AVCodecContext
629 * documentation must be set even if this AVCodecContext is
630 * not actually used for encoding.
631 */
632 AVCodecContext *codec;
b4b87d48 633 /**
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634 * Real base framerate of the stream.
635 * This is the lowest framerate with which all timestamps can be
864ff8c1 636 * represented accurately (it is the least common multiple of all
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637 * framerates in the stream). Note, this value is just a guess!
638 * For example, if the time base is 1/90000 and all frames have either
4f57fa8c 639 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
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640 */
641 AVRational r_frame_rate;
de6d9b64 642 void *priv_data;
82583548 643
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644 /**
645 * encoding: pts generation when outputting stream
646 */
a9fd2b19 647 struct AVFrac pts;
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648
649 /**
8bfb108b 650 * This is the fundamental unit of time (in seconds) in terms
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651 * of which frame timestamps are represented.
652 *
5d820db2 653 * decoding: set by libavformat
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654 * encoding: set by libavformat in av_write_header. The muxer may use the
655 * user-provided value of @ref AVCodecContext.time_base "codec->time_base"
656 * as a hint.
5b28c8c3 657 */
9ee91c2f 658 AVRational time_base;
76c56376 659
6d96a9b9 660 /**
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661 * Decoding: pts of the first frame of the stream, in stream time base.
662 * Only set this if you are absolutely 100% sure that the value you set
663 * it to really is the pts of the first frame.
4854c253 664 * This may be undefined (AV_NOPTS_VALUE).
6d96a9b9 665 */
115329f1 666 int64_t start_time;
76c56376 667
e26381b6 668 /**
8bfb108b 669 * Decoding: duration of the stream, in stream time base.
e26381b6 670 * If a source file does not specify a duration, but does specify
4f57fa8c 671 * a bitrate, this value will be estimated from bitrate and file size.
e26381b6 672 */
ee404803 673 int64_t duration;
fb2758c8 674
b4b87d48 675 int64_t nb_frames; ///< number of frames in this stream if known or 0
504ee036 676
4f57fa8c 677 int disposition; /**< AV_DISPOSITION_* bit field */
0bef08e5 678
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679 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
680
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681 /**
682 * sample aspect ratio (0 if unknown)
683 * - encoding: Set by user.
684 * - decoding: Set by libavformat.
685 */
686 AVRational sample_aspect_ratio;
f526adaf 687
d2d67e42 688 AVDictionary *metadata;
3a41c2f7 689
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690 /**
691 * Average framerate
692 */
693 AVRational avg_frame_rate;
6c6e6ef5 694
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695 /**
696 * For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
697 * will contain the attached picture.
698 *
699 * decoding: set by libavformat, must not be modified by the caller.
700 * encoding: unused
701 */
702 AVPacket attached_pic;
703
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704 /*****************************************************************
705 * All fields below this line are not part of the public API. They
706 * may not be used outside of libavformat and can be changed and
707 * removed at will.
708 * New public fields should be added right above.
709 *****************************************************************
710 */
711
6c6e6ef5 712 /**
da9cea77 713 * Stream information used internally by av_find_stream_info()
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714 */
715#define MAX_STD_TIMEBASES (60*12+5)
716 struct {
717 int64_t last_dts;
718 int64_t duration_gcd;
719 int duration_count;
720 double duration_error[MAX_STD_TIMEBASES];
721 int64_t codec_info_duration;
38a4be3f 722 int nb_decoded_frames;
8c1d6ac6 723 int found_decoder;
fd0368e7 724 } *info;
ee42df8a 725
ee42df8a 726 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
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727
728 // Timestamp generation support:
729 /**
730 * Timestamp corresponding to the last dts sync point.
731 *
732 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
733 * a DTS is received from the underlying container. Otherwise set to
734 * AV_NOPTS_VALUE by default.
735 */
736 int64_t reference_dts;
737 int64_t first_dts;
738 int64_t cur_dts;
9a174562 739 int64_t last_IP_pts;
ee42df8a 740 int last_IP_duration;
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741
742 /**
743 * Number of packets to buffer for codec probing
744 */
745#define MAX_PROBE_PACKETS 2500
746 int probe_packets;
747
748 /**
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749 * Number of frames that have been demuxed during av_find_stream_info()
750 */
751 int codec_info_nb_frames;
752
753 /* av_read_frame() support */
754 enum AVStreamParseType need_parsing;
755 struct AVCodecParserContext *parser;
756
757 /**
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758 * last packet in packet_buffer for this stream when muxing.
759 */
760 struct AVPacketList *last_in_packet_buffer;
761 AVProbeData probe_data;
762#define MAX_REORDER_DELAY 16
763 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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764
765 AVIndexEntry *index_entries; /**< Only used if the format does not
766 support seeking natively. */
767 int nb_index_entries;
768 unsigned int index_entries_allocated_size;
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769} AVStream;
770
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771#define AV_PROGRAM_RUNNING 1
772
ba66ae94 773/**
ba66ae94 774 * New fields can be added to the end with minor version bumps.
8bfb108b 775 * Removal, reordering and changes to existing fields require a major
ba66ae94 776 * version bump.
8bfb108b 777 * sizeof(AVProgram) must not be used outside libav*.
ba66ae94 778 */
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779typedef struct AVProgram {
780 int id;
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781 int flags;
782 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
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783 unsigned int *stream_index;
784 unsigned int nb_stream_indexes;
d2d67e42 785 AVDictionary *metadata;
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786} AVProgram;
787
43d414ba 788#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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789 (streams are added dynamically) */
790
79d7836a 791typedef struct AVChapter {
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792 int id; ///< unique ID to identify the chapter
793 AVRational time_base; ///< time base in which the start/end timestamps are specified
8931e7b4 794 int64_t start, end; ///< chapter start/end time in time_base units
d2d67e42 795 AVDictionary *metadata;
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796} AVChapter;
797
252f17e2 798/**
4f57fa8c 799 * Format I/O context.
252f17e2 800 * New fields can be added to the end with minor version bumps.
8bfb108b 801 * Removal, reordering and changes to existing fields require a major
252f17e2 802 * version bump.
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803 * sizeof(AVFormatContext) must not be used outside libav*, use
804 * avformat_alloc_context() to create an AVFormatContext.
252f17e2 805 */
de6d9b64 806typedef struct AVFormatContext {
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807 /**
808 * A class for logging and AVOptions. Set by avformat_alloc_context().
809 * Exports (de)muxer private options if they exist.
810 */
811 const AVClass *av_class;
812
813 /**
814 * Can only be iformat or oformat, not both at the same time.
815 *
816 * decoding: set by avformat_open_input().
817 * encoding: set by the user.
818 */
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819 struct AVInputFormat *iformat;
820 struct AVOutputFormat *oformat;
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821
822 /**
823 * Format private data. This is an AVOptions-enabled struct
824 * if and only if iformat/oformat.priv_class is not NULL.
825 */
de6d9b64 826 void *priv_data;
83daced0 827
1432c1c4 828 /**
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829 * I/O context.
830 *
831 * decoding: either set by the user before avformat_open_input() (then
832 * the user must close it manually) or set by avformat_open_input().
833 * encoding: set by the user.
834 *
835 * Do NOT set this field if AVFMT_NOFILE flag is set in
836 * iformat/oformat.flags. In such a case, the (de)muxer will handle
837 * I/O in some other way and this field will be NULL.
838 */
ae628ec1 839 AVIOContext *pb;
83daced0 840
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841 /* stream info */
842 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
843
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844 /**
845 * A list of all streams in the file. New streams are created with
846 * avformat_new_stream().
847 *
848 * decoding: streams are created by libavformat in avformat_open_input().
849 * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
850 * appear in av_read_frame().
851 * encoding: streams are created by the user before avformat_write_header().
852 */
db69c2e5 853 unsigned int nb_streams;
38aab35f 854 AVStream **streams;
83daced0 855
43d414ba 856 char filename[1024]; /**< input or output filename */
ee404803 857
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858 /**
859 * Decoding: position of the first frame of the component, in
860 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
861 * It is deduced from the AVStream values.
862 */
115329f1 863 int64_t start_time;
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864
865 /**
866 * Decoding: duration of the stream, in AV_TIME_BASE fractional
867 * seconds. Only set this value if you know none of the individual stream
da9cea77 868 * durations and also do not set any of them. This is deduced from the
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869 * AVStream values if not set.
870 */
ee404803 871 int64_t duration;
76c56376 872
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873 /**
874 * Decoding: total stream bitrate in bit/s, 0 if not
875 * available. Never set it directly if the file_size and the
6001dad6 876 * duration are known as Libav can compute it automatically.
76c56376 877 */
ee404803 878 int bit_rate;
fb2758c8 879
92400be2 880 unsigned int packet_size;
17c88cb0 881 int max_delay;
8108551a 882
30bc6613 883 int flags;
22e77e44 884#define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
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885#define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
886#define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
c55806e3 887#define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
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888#define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
889#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
681ed000 890#define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible
05e84c95 891#define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
73e8e8db 892#define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
5894e1bb 893
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894 /**
895 * decoding: size of data to probe; encoding: unused.
896 */
9e6c9470 897 unsigned int probesize;
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898
899 /**
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900 * decoding: maximum time (in AV_TIME_BASE units) during which the input should
901 * be analyzed in avformat_find_stream_info().
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902 */
903 int max_analyze_duration;
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904
905 const uint8_t *key;
906 int keylen;
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907
908 unsigned int nb_programs;
909 AVProgram **programs;
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910
911 /**
912 * Forced video codec_id.
4f57fa8c 913 * Demuxing: Set by user.
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914 */
915 enum CodecID video_codec_id;
76c56376 916
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917 /**
918 * Forced audio codec_id.
4f57fa8c 919 * Demuxing: Set by user.
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920 */
921 enum CodecID audio_codec_id;
76c56376 922
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923 /**
924 * Forced subtitle codec_id.
4f57fa8c 925 * Demuxing: Set by user.
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926 */
927 enum CodecID subtitle_codec_id;
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928
929 /**
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930 * Maximum amount of memory in bytes to use for the index of each stream.
931 * If the index exceeds this size, entries will be discarded as
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932 * needed to maintain a smaller size. This can lead to slower or less
933 * accurate seeking (depends on demuxer).
4f57fa8c 934 * Demuxers for which a full in-memory index is mandatory will ignore
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935 * this.
936 * muxing : unused
937 * demuxing: set by user
938 */
939 unsigned int max_index_size;
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940
941 /**
ffa71b2b 942 * Maximum amount of memory in bytes to use for buffering frames
4f57fa8c 943 * obtained from realtime capture devices.
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944 */
945 unsigned int max_picture_buffer;
79d7836a 946
fbabf1e9 947 unsigned int nb_chapters;
79d7836a 948 AVChapter **chapters;
45b2b05f 949
d2d67e42 950 AVDictionary *metadata;
af122d6a 951
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952 /**
953 * Start time of the stream in real world time, in microseconds
954 * since the unix epoch (00:00 1st January 1970). That is, pts=0
955 * in the stream was captured at this real world time.
956 * - encoding: Set by user.
957 * - decoding: Unused.
958 */
959 int64_t start_time_realtime;
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960
961 /**
962 * decoding: number of frames used to probe fps
963 */
964 int fps_probe_size;
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965
966 /**
967 * Error recognition; higher values will detect more errors but may
968 * misdetect some more or less valid parts as errors.
969 * - encoding: unused
970 * - decoding: Set by user.
971 */
972 int error_recognition;
df968050 973
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974 /**
975 * Custom interrupt callbacks for the I/O layer.
976 *
977 * decoding: set by the user before avformat_open_input().
978 * encoding: set by the user before avformat_write_header()
979 * (mainly useful for AVFMT_NOFILE formats). The callback
980 * should also be passed to avio_open2() if it's used to
981 * open the file.
982 */
983 AVIOInterruptCB interrupt_callback;
984
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985 /**
986 * Flags to enable debugging.
987 */
988 int debug;
989#define FF_FDEBUG_TS 0x0001
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990 /*****************************************************************
991 * All fields below this line are not part of the public API. They
992 * may not be used outside of libavformat and can be changed and
993 * removed at will.
994 * New public fields should be added right above.
995 *****************************************************************
996 */
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997
998 /**
999 * This buffer is only needed when packets were already buffered but
1000 * not decoded, for example to get the codec parameters in MPEG
1001 * streams.
1002 */
1003 struct AVPacketList *packet_buffer;
1004 struct AVPacketList *packet_buffer_end;
1005
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1006 /* av_seek_frame() support */
1007 int64_t data_offset; /**< offset of the first packet */
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1008
1009 /**
1010 * Raw packets from the demuxer, prior to parsing and decoding.
1011 * This buffer is used for buffering packets until the codec can
1012 * be identified, as parsing cannot be done without knowing the
1013 * codec.
1014 */
1015 struct AVPacketList *raw_packet_buffer;
1016 struct AVPacketList *raw_packet_buffer_end;
1017 /**
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1018 * Packets split by the parser get queued here.
1019 */
1020 struct AVPacketList *parse_queue;
1021 struct AVPacketList *parse_queue_end;
1022 /**
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1023 * Remaining size available for raw_packet_buffer, in bytes.
1024 */
1025#define RAW_PACKET_BUFFER_SIZE 2500000
1026 int raw_packet_buffer_remaining_size;
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1027} AVFormatContext;
1028
1029typedef struct AVPacketList {
1030 AVPacket pkt;
1031 struct AVPacketList *next;
1032} AVPacketList;
1033
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1034
1035/**
1036 * @defgroup lavf_core Core functions
1037 * @ingroup libavf
1038 *
1039 * Functions for querying libavformat capabilities, allocating core structures,
1040 * etc.
1041 * @{
1042 */
1043
1044/**
1045 * Return the LIBAVFORMAT_VERSION_INT constant.
1046 */
1047unsigned avformat_version(void);
1048
1049/**
1050 * Return the libavformat build-time configuration.
1051 */
1052const char *avformat_configuration(void);
1053
1054/**
1055 * Return the libavformat license.
1056 */
1057const char *avformat_license(void);
1058
1059/**
1060 * Initialize libavformat and register all the muxers, demuxers and
1061 * protocols. If you do not call this function, then you can select
1062 * exactly which formats you want to support.
1063 *
1064 * @see av_register_input_format()
1065 * @see av_register_output_format()
1066 * @see av_register_protocol()
1067 */
1068void av_register_all(void);
1069
1070void av_register_input_format(AVInputFormat *format);
1071void av_register_output_format(AVOutputFormat *format);
1072
1073/**
1074 * Do global initialization of network components. This is optional,
1075 * but recommended, since it avoids the overhead of implicitly
1076 * doing the setup for each session.
1077 *
1078 * Calling this function will become mandatory if using network
1079 * protocols at some major version bump.
1080 */
1081int avformat_network_init(void);
1082
1083/**
1084 * Undo the initialization done by avformat_network_init.
1085 */
1086int avformat_network_deinit(void);
1087
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1088/**
1089 * If f is NULL, returns the first registered input format,
22e77e44 1090 * if f is non-NULL, returns the next registered input format after f
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1091 * or NULL if f is the last one.
1092 */
84be6e72 1093AVInputFormat *av_iformat_next(AVInputFormat *f);
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1094
1095/**
1096 * If f is NULL, returns the first registered output format,
22e77e44 1097 * if f is non-NULL, returns the next registered output format after f
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1098 * or NULL if f is the last one.
1099 */
84be6e72 1100AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 1101
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1102/**
1103 * Allocate an AVFormatContext.
1104 * avformat_free_context() can be used to free the context and everything
1105 * allocated by the framework within it.
1106 */
1107AVFormatContext *avformat_alloc_context(void);
1108
1109/**
1110 * Free an AVFormatContext and all its streams.
1111 * @param s context to free
1112 */
1113void avformat_free_context(AVFormatContext *s);
1114
1115/**
1116 * Get the AVClass for AVFormatContext. It can be used in combination with
1117 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
1118 *
1119 * @see av_opt_find().
1120 */
1121const AVClass *avformat_get_class(void);
1122
1123/**
1124 * Add a new stream to a media file.
1125 *
1126 * When demuxing, it is called by the demuxer in read_header(). If the
1127 * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
1128 * be called in read_packet().
1129 *
1130 * When muxing, should be called by the user before avformat_write_header().
1131 *
1132 * @param c If non-NULL, the AVCodecContext corresponding to the new stream
1133 * will be initialized to use this codec. This is needed for e.g. codec-specific
1134 * defaults to be set, so codec should be provided if it is known.
1135 *
1136 * @return newly created stream or NULL on error.
1137 */
1138AVStream *avformat_new_stream(AVFormatContext *s, AVCodec *c);
1139
1140AVProgram *av_new_program(AVFormatContext *s, int id);
1141
1142/**
1143 * @}
1144 */
1145
1146
370f27de 1147/**
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1148 * @addtogroup lavf_decoding
1149 * @{
1150 */
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1151
1152/**
49bd8e4b 1153 * Find AVInputFormat based on the short name of the input format.
3217cb42 1154 */
b9a281db 1155AVInputFormat *av_find_input_format(const char *short_name);
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1156
1157/**
49bd8e4b 1158 * Guess the file format.
3217cb42 1159 *
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1160 * @param is_opened Whether the file is already opened; determines whether
1161 * demuxers with or without AVFMT_NOFILE are probed.
3217cb42 1162 */
94988531 1163AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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1164
1165/**
49bd8e4b 1166 * Guess the file format.
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1167 *
1168 * @param is_opened Whether the file is already opened; determines whether
1169 * demuxers with or without AVFMT_NOFILE are probed.
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1170 * @param score_max A probe score larger that this is required to accept a
1171 * detection, the variable is set to the actual detection
1172 * score afterwards.
1173 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
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RD
1174 * to retry with a larger probe buffer.
1175 */
1176AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
1177
1178/**
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1179 * Probe a bytestream to determine the input format. Each time a probe returns
1180 * with a score that is too low, the probe buffer size is increased and another
1181 * attempt is made. When the maximum probe size is reached, the input format
1182 * with the highest score is returned.
1183 *
1184 * @param pb the bytestream to probe
1185 * @param fmt the input format is put here
1186 * @param filename the filename of the stream
1187 * @param logctx the log context
1188 * @param offset the offset within the bytestream to probe from
1189 * @param max_probe_size the maximum probe buffer size (zero for default)
1190 * @return 0 in case of success, a negative value corresponding to an
1191 * AVERROR code otherwise
1192 */
ae628ec1 1193int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
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1194 const char *filename, void *logctx,
1195 unsigned int offset, unsigned int max_probe_size);
1196
88808c60 1197/**
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1198 * Open an input stream and read the header. The codecs are not opened.
1199 * The stream must be closed with av_close_input_file().
1200 *
1201 * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
1202 * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
1203 * function and written into ps.
1204 * Note that a user-supplied AVFormatContext will be freed on failure.
1205 * @param filename Name of the stream to open.
1206 * @param fmt If non-NULL, this parameter forces a specific input format.
1207 * Otherwise the format is autodetected.
1208 * @param options A dictionary filled with AVFormatContext and demuxer-private options.
1209 * On return this parameter will be destroyed and replaced with a dict containing
1210 * options that were not found. May be NULL.
1211 *
1212 * @return 0 on success, a negative AVERROR on failure.
1213 *
1214 * @note If you want to use custom IO, preallocate the format context and set its pb field.
1215 */
1216int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
1217
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1218/**
1219 * Read packets of a media file to get stream information. This
1220 * is useful for file formats with no headers such as MPEG. This
1221 * function also computes the real framerate in case of MPEG-2 repeat
1222 * frame mode.
1223 * The logical file position is not changed by this function;
1224 * examined packets may be buffered for later processing.
1225 *
1226 * @param ic media file handle
1227 * @param options If non-NULL, an ic.nb_streams long array of pointers to
1228 * dictionaries, where i-th member contains options for
1229 * codec corresponding to i-th stream.
1230 * On return each dictionary will be filled with options that were not found.
1231 * @return >=0 if OK, AVERROR_xxx on error
1232 *
1233 * @note this function isn't guaranteed to open all the codecs, so
1234 * options being non-empty at return is a perfectly normal behavior.
1235 *
1236 * @todo Let the user decide somehow what information is needed so that
1237 * we do not waste time getting stuff the user does not need.
1238 */
1239int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options);
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1240
1241/**
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1242 * Find the "best" stream in the file.
1243 * The best stream is determined according to various heuristics as the most
1244 * likely to be what the user expects.
1245 * If the decoder parameter is non-NULL, av_find_best_stream will find the
1246 * default decoder for the stream's codec; streams for which no decoder can
1247 * be found are ignored.
1248 *
1249 * @param ic media file handle
1250 * @param type stream type: video, audio, subtitles, etc.
1251 * @param wanted_stream_nb user-requested stream number,
1252 * or -1 for automatic selection
1253 * @param related_stream try to find a stream related (eg. in the same
1254 * program) to this one, or -1 if none
1255 * @param decoder_ret if non-NULL, returns the decoder for the
1256 * selected stream
1257 * @param flags flags; none are currently defined
1258 * @return the non-negative stream number in case of success,
1259 * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
1260 * could be found,
1261 * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
1262 * @note If av_find_best_stream returns successfully and decoder_ret is not
1263 * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
1264 */
1265int av_find_best_stream(AVFormatContext *ic,
1266 enum AVMediaType type,
1267 int wanted_stream_nb,
1268 int related_stream,
1269 AVCodec **decoder_ret,
1270 int flags);
1271
3c90cc2e 1272#if FF_API_READ_PACKET
9128ae08 1273/**
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1274 * @deprecated use AVFMT_FLAG_NOFILLIN | AVFMT_FLAG_NOPARSE to read raw
1275 * unprocessed packets
1276 *
49bd8e4b 1277 * Read a transport packet from a media file.
3217cb42 1278 *
864ff8c1 1279 * This function is obsolete and should never be used.
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1280 * Use av_read_frame() instead.
1281 *
1282 * @param s media file handle
1283 * @param pkt is filled
4f57fa8c 1284 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1285 */
3c90cc2e 1286attribute_deprecated
de6d9b64 1287int av_read_packet(AVFormatContext *s, AVPacket *pkt);
3c90cc2e 1288#endif
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1289
1290/**
49bd8e4b 1291 * Return the next frame of a stream.
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1292 * This function returns what is stored in the file, and does not validate
1293 * that what is there are valid frames for the decoder. It will split what is
1294 * stored in the file into frames and return one for each call. It will not
1295 * omit invalid data between valid frames so as to give the decoder the maximum
1296 * information possible for decoding.
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1297 *
1298 * The returned packet is valid
1299 * until the next av_read_frame() or until av_close_input_file() and
1300 * must be freed with av_free_packet. For video, the packet contains
1301 * exactly one frame. For audio, it contains an integer number of
1302 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
1303 * data). If the audio frames have a variable size (e.g. MPEG audio),
1304 * then it contains one frame.
1305 *
1306 * pkt->pts, pkt->dts and pkt->duration are always set to correct
22e77e44 1307 * values in AVStream.time_base units (and guessed if the format cannot
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DB
1308 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
1309 * has B-frames, so it is better to rely on pkt->dts if you do not
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1310 * decompress the payload.
1311 *
4f57fa8c 1312 * @return 0 if OK, < 0 on error or end of file
3217cb42 1313 */
fb2758c8 1314int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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1315
1316/**
49bd8e4b 1317 * Seek to the keyframe at timestamp.
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1318 * 'timestamp' in 'stream_index'.
1319 * @param stream_index If stream_index is (-1), a default
1320 * stream is selected, and timestamp is automatically converted
1321 * from AV_TIME_BASE units to the stream specific time_base.
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1322 * @param timestamp Timestamp in AVStream.time_base units
1323 * or, if no stream is specified, in AV_TIME_BASE units.
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1324 * @param flags flags which select direction and seeking mode
1325 * @return >= 0 on success
1326 */
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1327int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
1328 int flags);
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1329
1330/**
49bd8e4b 1331 * Seek to timestamp ts.
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1332 * Seeking will be done so that the point from which all active streams
1333 * can be presented successfully will be closest to ts and within min/max_ts.
1334 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
1335 *
22e77e44 1336 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
d04768fa 1337 * are the file position (this may not be supported by all demuxers).
22e77e44 1338 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
d04768fa 1339 * in the stream with stream_index (this may not be supported by all demuxers).
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DB
1340 * Otherwise all timestamps are in units of the stream selected by stream_index
1341 * or if stream_index is -1, in AV_TIME_BASE units.
1342 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
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1343 * keyframes (this may not be supported by all demuxers).
1344 *
22e77e44 1345 * @param stream_index index of the stream which is used as time base reference
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1346 * @param min_ts smallest acceptable timestamp
1347 * @param ts target timestamp
1348 * @param max_ts largest acceptable timestamp
1349 * @param flags flags
32e543f8 1350 * @return >=0 on success, error code otherwise
998b6f7c 1351 *
8a4d7a30 1352 * @note This is part of the new seek API which is still under construction.
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1353 * Thus do not use this yet. It may change at any time, do not expect
1354 * ABI compatibility yet!
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1355 */
1356int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
1357
1358/**
49bd8e4b 1359 * Start playing a network-based stream (e.g. RTSP stream) at the
4f57fa8c 1360 * current position.
3217cb42 1361 */
fb2758c8 1362int av_read_play(AVFormatContext *s);
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1363
1364/**
49bd8e4b 1365 * Pause a network-based stream (e.g. RTSP stream).
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1366 *
1367 * Use av_read_play() to resume it.
1368 */
fb2758c8 1369int av_read_pause(AVFormatContext *s);
3217cb42 1370
52660454 1371#if FF_API_CLOSE_INPUT_FILE
2506fd54 1372/**
52660454 1373 * @deprecated use avformat_close_input()
49bd8e4b 1374 * Close a media file (but not its codecs).
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1375 *
1376 * @param s media file handle
1377 */
52660454 1378attribute_deprecated
de6d9b64 1379void av_close_input_file(AVFormatContext *s);
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1380#endif
1381
1382/**
1383 * Close an opened input AVFormatContext. Free it and all its contents
1384 * and set *s to NULL.
1385 */
1386void avformat_close_input(AVFormatContext **s);
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1387/**
1388 * @}
1389 */
3217cb42 1390
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1391#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1392#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
4f57fa8c 1393#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
2bf74f49 1394#define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
3ba1438d 1395
3217cb42 1396/**
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1397 * @addtogroup lavf_encoding
1398 * @{
1399 */
f3bfe388 1400/**
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1401 * Allocate the stream private data and write the stream header to
1402 * an output media file.
1403 *
1404 * @param s Media file handle, must be allocated with avformat_alloc_context().
1405 * Its oformat field must be set to the desired output format;
1406 * Its pb field must be set to an already openened AVIOContext.
1407 * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
1408 * On return this parameter will be destroyed and replaced with a dict containing
1409 * options that were not found. May be NULL.
1410 *
1411 * @return 0 on success, negative AVERROR on failure.
1412 *
1413 * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
1414 */
1415int avformat_write_header(AVFormatContext *s, AVDictionary **options);
1416
3217cb42 1417/**
49bd8e4b 1418 * Write a packet to an output media file.
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1419 *
1420 * The packet shall contain one audio or video frame.
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1421 * The packet must be correctly interleaved according to the container
1422 * specification, if not then av_interleaved_write_frame must be used.
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1423 *
1424 * @param s media file handle
78cb7273 1425 * @param pkt The packet, which contains the stream_index, buf/buf_size,
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1426 * dts/pts, ...
1427 * This can be NULL (at any time, not just at the end), in
1428 * order to immediately flush data buffered within the muxer,
1429 * for muxers that buffer up data internally before writing it
1430 * to the output.
1431 * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
3217cb42 1432 */
e928649b 1433int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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1434
1435/**
49bd8e4b 1436 * Write a packet to an output media file ensuring correct interleaving.
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1437 *
1438 * The packet must contain one audio or video frame.
22e77e44 1439 * If the packets are already correctly interleaved, the application should
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DB
1440 * call av_write_frame() instead as it is slightly faster. It is also important
1441 * to keep in mind that completely non-interleaved input will need huge amounts
1442 * of memory to interleave with this, so it is preferable to interleave at the
1443 * demuxer level.
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1444 *
1445 * @param s media file handle
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1446 * @param pkt The packet containing the data to be written. Libavformat takes
1447 * ownership of the data and will free it when it sees fit using the packet's
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1448 * This can be NULL (at any time, not just at the end), to flush the
1449 * interleaving queues.
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1450 * @ref AVPacket.destruct "destruct" field. The caller must not access the data
1451 * after this function returns, as it may already be freed.
1452 * Packet's @ref AVPacket.stream_index "stream_index" field must be set to the
1453 * index of the corresponding stream in @ref AVFormatContext.streams
1454 * "s.streams".
1455 * It is very strongly recommended that timing information (@ref AVPacket.pts
1456 * "pts", @ref AVPacket.dts "dts" @ref AVPacket.duration "duration") is set to
1457 * correct values.
1458 *
1459 * @return 0 on success, a negative AVERROR on error.
3217cb42 1460 */
3c895fc0 1461int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
3217cb42 1462
a6733202 1463#if FF_API_INTERLEAVE_PACKET
3217cb42 1464/**
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1465 * @deprecated this function was never meant to be called by the user
1466 * programs.
3217cb42 1467 */
a6733202 1468attribute_deprecated
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1469int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1470 AVPacket *pkt, int flush);
a6733202 1471#endif
e928649b 1472
3217cb42 1473/**
49bd8e4b 1474 * Write the stream trailer to an output media file and free the
2b75bde6 1475 * file private data.
3217cb42 1476 *
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1477 * May only be called after a successful call to av_write_header.
1478 *
3217cb42 1479 * @param s media file handle
4f57fa8c 1480 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1481 */
b9a281db 1482int av_write_trailer(AVFormatContext *s);
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1483
1484/**
1485 * Return the output format in the list of registered output formats
1486 * which best matches the provided parameters, or return NULL if
1487 * there is no match.
1488 *
1489 * @param short_name if non-NULL checks if short_name matches with the
1490 * names of the registered formats
1491 * @param filename if non-NULL checks if filename terminates with the
1492 * extensions of the registered formats
1493 * @param mime_type if non-NULL checks if mime_type matches with the
1494 * MIME type of the registered formats
1495 */
1496AVOutputFormat *av_guess_format(const char *short_name,
1497 const char *filename,
1498 const char *mime_type);
1499
1500/**
1501 * Guess the codec ID based upon muxer and filename.
1502 */
1503enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
1504 const char *filename, const char *mime_type,
1505 enum AVMediaType type);
1506
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1507/**
1508 * @}
1509 */
de6d9b64 1510
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1511
1512/**
1513 * @defgroup lavf_misc Utility functions
1514 * @ingroup libavf
1515 * @{
1516 *
1517 * Miscelaneous utility functions related to both muxing and demuxing
1518 * (or neither).
1519 */
1520
1521/**
1522 * Send a nice hexadecimal dump of a buffer to the specified file stream.
1523 *
1524 * @param f The file stream pointer where the dump should be sent to.
1525 * @param buf buffer
1526 * @param size buffer size
1527 *
1528 * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
1529 */
1530void av_hex_dump(FILE *f, uint8_t *buf, int size);
1531
1532/**
1533 * Send a nice hexadecimal dump of a buffer to the log.
1534 *
1535 * @param avcl A pointer to an arbitrary struct of which the first field is a
1536 * pointer to an AVClass struct.
1537 * @param level The importance level of the message, lower values signifying
1538 * higher importance.
1539 * @param buf buffer
1540 * @param size buffer size
1541 *
1542 * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
1543 */
1544void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
1545
1546/**
1547 * Send a nice dump of a packet to the specified file stream.
1548 *
1549 * @param f The file stream pointer where the dump should be sent to.
1550 * @param pkt packet to dump
1551 * @param dump_payload True if the payload must be displayed, too.
1552 * @param st AVStream that the packet belongs to
1553 */
1554void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
1555
1556
1557/**
1558 * Send a nice dump of a packet to the log.
1559 *
1560 * @param avcl A pointer to an arbitrary struct of which the first field is a
1561 * pointer to an AVClass struct.
1562 * @param level The importance level of the message, lower values signifying
1563 * higher importance.
1564 * @param pkt packet to dump
1565 * @param dump_payload True if the payload must be displayed, too.
1566 * @param st AVStream that the packet belongs to
1567 */
1568void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
1569 AVStream *st);
1570
1571/**
1572 * Get the CodecID for the given codec tag tag.
1573 * If no codec id is found returns CODEC_ID_NONE.
1574 *
1575 * @param tags list of supported codec_id-codec_tag pairs, as stored
1576 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1577 */
1578enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
1579
1580/**
1581 * Get the codec tag for the given codec id id.
1582 * If no codec tag is found returns 0.
1583 *
1584 * @param tags list of supported codec_id-codec_tag pairs, as stored
1585 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
1586 */
1587unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
1588
1589int av_find_default_stream_index(AVFormatContext *s);
1590
1591/**
1592 * Get the index for a specific timestamp.
1593 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1594 * to the timestamp which is <= the requested one, if backward
1595 * is 0, then it will be >=
1596 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1597 * @return < 0 if no such timestamp could be found
1598 */
1599int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1600
1601/**
1602 * Add an index entry into a sorted list. Update the entry if the list
1603 * already contains it.
1604 *
1605 * @param timestamp timestamp in the time base of the given stream
1606 */
1607int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1608 int size, int distance, int flags);
1609
1610
1611/**
1612 * Split a URL string into components.
1613 *
1614 * The pointers to buffers for storing individual components may be null,
1615 * in order to ignore that component. Buffers for components not found are
1616 * set to empty strings. If the port is not found, it is set to a negative
1617 * value.
1618 *
1619 * @param proto the buffer for the protocol
1620 * @param proto_size the size of the proto buffer
1621 * @param authorization the buffer for the authorization
1622 * @param authorization_size the size of the authorization buffer
1623 * @param hostname the buffer for the host name
1624 * @param hostname_size the size of the hostname buffer
1625 * @param port_ptr a pointer to store the port number in
1626 * @param path the buffer for the path
1627 * @param path_size the size of the path buffer
1628 * @param url the URL to split
1629 */
1630void av_url_split(char *proto, int proto_size,
1631 char *authorization, int authorization_size,
1632 char *hostname, int hostname_size,
1633 int *port_ptr,
1634 char *path, int path_size,
1635 const char *url);
1636
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1637
1638void av_dump_format(AVFormatContext *ic,
1639 int index,
1640 const char *url,
1641 int is_output);
3217cb42 1642
3217cb42 1643/**
49bd8e4b 1644 * Return in 'buf' the path with '%d' replaced by a number.
4f57fa8c 1645 *
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1646 * Also handles the '%0nd' format where 'n' is the total number
1647 * of digits and '%%'.
1648 *
1649 * @param buf destination buffer
1650 * @param buf_size destination buffer size
1651 * @param path numbered sequence string
8ea0e802 1652 * @param number frame number
4f57fa8c 1653 * @return 0 if OK, -1 on format error
3217cb42 1654 */
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1655int av_get_frame_filename(char *buf, int buf_size,
1656 const char *path, int number);
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1657
1658/**
49bd8e4b 1659 * Check whether filename actually is a numbered sequence generator.
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1660 *
1661 * @param filename possible numbered sequence string
4f57fa8c 1662 * @return 1 if a valid numbered sequence string, 0 otherwise
3217cb42 1663 */
5c07cf53 1664int av_filename_number_test(const char *filename);
96baaa6a 1665
c5388c07 1666/**
49bd8e4b 1667 * Generate an SDP for an RTP session.
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1668 *
1669 * @param ac array of AVFormatContexts describing the RTP streams. If the
1670 * array is composed by only one context, such context can contain
1671 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1672 * all the contexts in the array (an AVCodecContext per RTP stream)
4f57fa8c 1673 * must contain only one AVStream.
8767b80f 1674 * @param n_files number of AVCodecContexts contained in ac
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1675 * @param buf buffer where the SDP will be stored (must be allocated by
1676 * the caller)
8767b80f 1677 * @param size the size of the buffer
4f57fa8c 1678 * @return 0 if OK, AVERROR_xxx on error
c5388c07 1679 */
c234d40b 1680int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
c3675dfe 1681
1a70d127 1682/**
49bd8e4b 1683 * Return a positive value if the given filename has one of the given
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1684 * extensions, 0 otherwise.
1685 *
1686 * @param extensions a comma-separated list of filename extensions
1687 */
1688int av_match_ext(const char *filename, const char *extensions);
1689
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1690/**
1691 * Test if the given container can store a codec.
1692 *
1693 * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
1694 *
1695 * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
1696 * A negative number if this information is not available.
1697 */
1698int avformat_query_codec(AVOutputFormat *ofmt, enum CodecID codec_id, int std_compliance);
1699
abf2c2d7 1700/**
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1701 * @defgroup riff_fourcc RIFF FourCCs
1702 * @{
1703 * Get the tables mapping RIFF FourCCs to libavcodec CodecIDs. The tables are
1704 * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
1705 * following code:
1706 * @code
1707 * uint32_t tag = MKTAG('H', '2', '6', '4');
1708 * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
1709 * enum CodecID id = av_codec_get_id(table, tag);
1710 * @endcode
1711 */
1712/**
1713 * @return the table mapping RIFF FourCCs for video to libavcodec CodecID.
1714 */
1715const struct AVCodecTag *avformat_get_riff_video_tags(void);
1716/**
1717 * @return the table mapping RIFF FourCCs for audio to CodecID.
1718 */
1719const struct AVCodecTag *avformat_get_riff_audio_tags(void);
1720/**
1721 * @}
1722 */
1723
1724/**
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1725 * @}
1726 */
1727
98790382 1728#endif /* AVFORMAT_AVFORMAT_H */