10l: Ignore error output from failed attempt to read snapshot_version.
[libav.git] / libavformat / avformat.h
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1/*
2 * copyright (c) 2001 Fabrice Bellard
3 *
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4 * This file is part of FFmpeg.
5 *
6 * FFmpeg 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 *
b78e7197 11 * FFmpeg 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
b78e7197 17 * License along with FFmpeg; 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
800c289a 24#define LIBAVFORMAT_VERSION_MAJOR 52
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25#define LIBAVFORMAT_VERSION_MINOR 30
26#define LIBAVFORMAT_VERSION_MICRO 0
e97ac1e6 27
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28#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
29 LIBAVFORMAT_VERSION_MINOR, \
30 LIBAVFORMAT_VERSION_MICRO)
31#define LIBAVFORMAT_VERSION AV_VERSION(LIBAVFORMAT_VERSION_MAJOR, \
32 LIBAVFORMAT_VERSION_MINOR, \
33 LIBAVFORMAT_VERSION_MICRO)
5aa083ee 34#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
8026c3b5 35
5aa083ee 36#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
4b1f4f23 37
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38/**
39 * Returns the LIBAVFORMAT_VERSION_INT constant.
40 */
41unsigned avformat_version(void);
42
f71869a4 43#include <time.h>
67070e4f 44#include <stdio.h> /* FILE */
76a448ed 45#include "libavcodec/avcodec.h"
de6d9b64 46
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47#include "avio.h"
48
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49
50/*
ea29242c 51 * Public Metadata API.
7a420671 52 * !!WARNING!! This is a work in progress. Don't use outside FFmpeg for now.
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53 * The metadata API allows libavformat to export metadata tags to a client
54 * application using a sequence of key/value pairs.
55 * Important concepts to keep in mind:
56 * 1. Keys are unique; there can never be 2 tags with the same key. This is
57 * also meant semantically, i.e., a demuxer should not knowingly produce
58 * several keys that are literally different but semantically identical.
59 * E.g., key=Author5, key=Author6. In this example, all authors must be
60 * placed in the same tag.
61 * 2. Metadata is flat, not hierarchical; there are no subtags. If you
62 * want to store, e.g., the email address of the child of producer Alice
63 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
64 * 3. A tag whose value is localized for a particular language is appended
65 * with a dash character ('-') and the ISO 639 3-letter language code.
66 * For example: Author-ger=Michael, Author-eng=Mike
67 * The original/default language is in the unqualified "Author" tag.
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68 * A demuxer should set a default if it sets any translated tag.
69 */
70
48a81c0f 71#define AV_METADATA_MATCH_CASE 1
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72#define AV_METADATA_IGNORE_SUFFIX 2
73
74typedef struct {
75 char *key;
76 char *value;
bc1d2afb 77}AVMetadataTag;
a6d18a0e 78
e232c252 79typedef struct AVMetadata AVMetadata;
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80
81/**
82 * gets a metadata element with matching key.
83 * @param prev set to the previous matching element to find the next.
04e76709 84 * @param flags allows case as well as suffix insensitive comparisons.
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85 * @return found tag or NULL, changing key or value leads to undefined behavior.
86 */
bc1d2afb 87AVMetadataTag *
e232c252 88av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
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89
90/**
91 * sets the given tag in m, overwriting an existing tag.
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92 * @param key tag key to add to m (will be av_strduped).
93 * @param value tag value to add to m (will be av_strduped).
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94 * @return >= 0 if success otherwise error code that is <0.
95 */
5ea7ce88 96int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
a6d18a0e 97
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98/**
99 * Free all the memory allocated for an AVMetadata struct.
100 */
101void av_metadata_free(AVMetadata **m);
102
a6d18a0e 103
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104/* packet functions */
105
106typedef struct AVPacket {
f6e76ba4 107 /**
4f57fa8c 108 * Presentation timestamp in time_base units.
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109 * This is the time at which the decompressed packet will be presented
110 * to the user.
111 * Can be AV_NOPTS_VALUE if it is not stored in the file.
4f57fa8c 112 * pts MUST be larger or equal to dts as presentation cannot happen before
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113 * decompression, unless one wants to view hex dumps. Some formats misuse
114 * the terms dts and pts/cts to mean something different, these timestamps
115 * must be converted to true pts/dts before they are stored in AVPacket.
116 */
117 int64_t pts;
118 /**
4f57fa8c 119 * Decompression timestamp in time_base units.
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120 * This is the time at which the packet is decompressed.
121 * Can be AV_NOPTS_VALUE if it is not stored in the file.
122 */
123 int64_t dts;
0c1a9eda 124 uint8_t *data;
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125 int size;
126 int stream_index;
127 int flags;
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128 /**
129 * Duration of this packet in time_base units, 0 if unknown.
130 * Equals next_pts - this_pts in presentation order.
131 */
132 int duration;
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133 void (*destruct)(struct AVPacket *);
134 void *priv;
2692067a 135 int64_t pos; ///< byte position in stream, -1 if unknown
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136
137 /**
4f57fa8c 138 * Time difference in stream time base units from the pts of this
e7f656d5 139 * packet to the point at which the output from the decoder has converged
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140 * independent from the availability of previous frames. That is, the
141 * frames are virtually identical no matter if decoding started from
142 * the very first frame or from this keyframe.
143 * Is AV_NOPTS_VALUE if unknown.
e7f656d5 144 * This field is not the display duration of the current packet.
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145 *
146 * The purpose of this field is to allow seeking in streams that have no
147 * keyframes in the conventional sense. It corresponds to the
4f57fa8c 148 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
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149 * essential for some types of subtitle streams to ensure that all
150 * subtitles are correctly displayed after seeking.
151 */
152 int64_t convergence_duration;
115329f1 153} AVPacket;
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154#define PKT_FLAG_KEY 0x0001
155
63dd1377 156void av_destruct_packet_nofree(AVPacket *pkt);
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157
158/**
159 * Default packet destructor.
160 */
90ad92b3 161void av_destruct_packet(AVPacket *pkt);
63dd1377 162
05abfce9 163/**
4f57fa8c 164 * Initialize optional fields of a packet with default values.
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165 *
166 * @param pkt packet
167 */
659596f0 168void av_init_packet(AVPacket *pkt);
de6d9b64 169
3217cb42 170/**
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171 * Allocate the payload of a packet and initialize its fields with
172 * default values.
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173 *
174 * @param pkt packet
175 * @param size wanted payload size
4f57fa8c 176 * @return 0 if OK, AVERROR_xxx otherwise
3217cb42 177 */
de6d9b64 178int av_new_packet(AVPacket *pkt, int size);
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179
180/**
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181 * Allocate and read the payload of a packet and initialize its fields with
182 * default values.
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183 *
184 * @param pkt packet
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185 * @param size desired payload size
186 * @return >0 (read size) if OK, AVERROR_xxx otherwise
3217cb42 187 */
2692067a 188int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
3217cb42 189
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190/**
191 * @warning This is a hack - the packet memory allocation stuff is broken. The
4f57fa8c 192 * packet is allocated if it was not really allocated.
43d414ba 193 */
fb2758c8 194int av_dup_packet(AVPacket *pkt);
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195
196/**
4f57fa8c 197 * Free a packet.
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198 *
199 * @param pkt packet to free
200 */
201static inline void av_free_packet(AVPacket *pkt)
202{
342474ab 203 if (pkt && pkt->destruct) {
bb270c08 204 pkt->destruct(pkt);
342474ab 205 }
6fa5a56c 206}
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207
208/*************************************************/
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209/* fractional numbers for exact pts handling */
210
671adb17 211/**
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212 * The exact value of the fractional number is: 'val + num / den'.
213 * num is assumed to be 0 <= num < den.
4c08b2bd 214 */
916c80e9 215typedef struct AVFrac {
115329f1 216 int64_t val, num, den;
52e57500 217} AVFrac;
916c80e9 218
916c80e9 219/*************************************************/
b9a281db 220/* input/output formats */
de6d9b64 221
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222struct AVCodecTag;
223
de6d9b64 224struct AVFormatContext;
b9a281db 225
4f57fa8c 226/** This structure contains the data a format has to probe a file. */
b9a281db 227typedef struct AVProbeData {
5c91a675 228 const char *filename;
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229 unsigned char *buf;
230 int buf_size;
231} AVProbeData;
232
4f57fa8c 233#define AVPROBE_SCORE_MAX 100 ///< Maximum score, half of that is used for file-extension-based detection.
87e87886 234#define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
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235
236typedef struct AVFormatParameters {
c0df9d75 237 AVRational time_base;
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238 int sample_rate;
239 int channels;
240 int width;
241 int height;
4606ac8d 242 enum PixelFormat pix_fmt;
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243 int channel; /**< Used to select DV channel. */
244 const char *standard; /**< TV standard, NTSC, PAL, SECAM */
245 unsigned int mpeg2ts_raw:1; /**< Force raw MPEG-2 transport stream output, if possible. */
246 unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transport
72e043dd 247 stream packet (only meaningful if
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248 mpeg2ts_raw is TRUE). */
249 unsigned int initial_pause:1; /**< Do not begin to play the stream
250 immediately (RTSP only). */
72e043dd 251 unsigned int prealloced_context:1;
71957315 252#if LIBAVFORMAT_VERSION_INT < (53<<16)
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253 enum CodecID video_codec_id;
254 enum CodecID audio_codec_id;
71957315 255#endif
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256} AVFormatParameters;
257
4f57fa8c 258//! Demuxer will use url_fopen, no opened file should be provided by the caller.
40d9c544 259#define AVFMT_NOFILE 0x0001
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260#define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
261#define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
262#define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
263 raw picture data. */
264#define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
265#define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
266#define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
267#define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. */
25918212 268#define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
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269
270typedef struct AVOutputFormat {
de6d9b64 271 const char *name;
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272 /**
273 * Descriptive name for the format, meant to be more human-readable
274 * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
275 * to define it.
276 */
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277 const char *long_name;
278 const char *mime_type;
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279 const char *extensions; /**< comma-separated filename extensions */
280 /** Size of private data so that it can be allocated in the wrapper. */
b9a281db 281 int priv_data_size;
de6d9b64 282 /* output support */
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283 enum CodecID audio_codec; /**< default audio codec */
284 enum CodecID video_codec; /**< default video codec */
de6d9b64 285 int (*write_header)(struct AVFormatContext *);
e928649b 286 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
de6d9b64 287 int (*write_trailer)(struct AVFormatContext *);
43d414ba 288 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
b9a281db 289 int flags;
4f57fa8c 290 /** Currently only used to set pixel format if not YUV420P. */
290c5fa6 291 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
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292 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
293 AVPacket *in, int flush);
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294
295 /**
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296 * List of supported codec_id-codec_tag pairs, ordered by "better
297 * choice first". The arrays are all CODEC_ID_NONE terminated.
7caf0cc6 298 */
c1854592 299 const struct AVCodecTag * const *codec_tag;
7caf0cc6 300
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301 enum CodecID subtitle_codec; /**< default subtitle codec */
302
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303 /* private fields */
304 struct AVOutputFormat *next;
305} AVOutputFormat;
de6d9b64 306
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307typedef struct AVInputFormat {
308 const char *name;
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309 /**
310 * Descriptive name for the format, meant to be more human-readable
311 * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro
312 * to define it.
313 */
b9a281db 314 const char *long_name;
4f57fa8c 315 /** Size of private data so that it can be allocated in the wrapper. */
b9a281db 316 int priv_data_size;
65d7d68b 317 /**
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318 * Tell if a given file has a chance of being parsed by this format.
319 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
320 * big so you do not have to check for that unless you need more.
65d7d68b 321 */
b9a281db 322 int (*read_probe)(AVProbeData *);
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323 /** Read the format header and initialize the AVFormatContext
324 structure. Return 0 if OK. 'ap' if non-NULL contains
325 additional parameters. Only used in raw format right
b9a281db 326 now. 'av_new_stream' should be called to create new streams. */
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327 int (*read_header)(struct AVFormatContext *,
328 AVFormatParameters *ap);
4f57fa8c 329 /** Read one packet and put it in 'pkt'. pts and flags are also
b9a281db 330 set. 'av_new_stream' can be called only if the flag
da24c5e3 331 AVFMTCTX_NOHEADER is used. */
de6d9b64 332 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
4f57fa8c 333 /** Close the stream. The AVFormatContext and AVStreams are not
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334 freed by this function */
335 int (*read_close)(struct AVFormatContext *);
115329f1 336 /**
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337 * Seek to a given timestamp relative to the frames in
338 * stream component stream_index.
3ba1438d 339 * @param stream_index must not be -1
115329f1 340 * @param flags selects which direction should be preferred if no exact
3ba1438d 341 * match is available
05ce0f11 342 * @return >= 0 on success (but not necessarily the new offset)
3ba1438d 343 */
115329f1 344 int (*read_seek)(struct AVFormatContext *,
3ba1438d 345 int stream_index, int64_t timestamp, int flags);
8d14a25c 346 /**
4f57fa8c 347 * Gets the next timestamp in stream[stream_index].time_base units.
d9526386 348 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
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349 */
350 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
351 int64_t *pos, int64_t pos_limit);
4f57fa8c 352 /** Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER. */
de6d9b64 353 int flags;
4f57fa8c 354 /** If extensions are defined, then no probe is done. You should
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355 usually not use extension format guessing because it is not
356 reliable enough */
357 const char *extensions;
4f57fa8c 358 /** General purpose read-only value that the format can use. */
b9a281db 359 int value;
fb2758c8 360
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361 /** Start/resume playing - only meaningful if using a network-based format
362 (RTSP). */
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363 int (*read_play)(struct AVFormatContext *);
364
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365 /** Pause playing - only meaningful if using a network-based format
366 (RTSP). */
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367 int (*read_pause)(struct AVFormatContext *);
368
c1854592 369 const struct AVCodecTag * const *codec_tag;
7caf0cc6 370
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371 /* private fields */
372 struct AVInputFormat *next;
373} AVInputFormat;
de6d9b64 374
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375enum AVStreamParseType {
376 AVSTREAM_PARSE_NONE,
377 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
4f57fa8c 378 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
78cb7273 379 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
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380};
381
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382typedef struct AVIndexEntry {
383 int64_t pos;
384 int64_t timestamp;
385#define AVINDEX_KEYFRAME 0x0001
30a43f2d 386 int flags:2;
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387 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).
388 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
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389} AVIndexEntry;
390
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391#define AV_DISPOSITION_DEFAULT 0x0001
392#define AV_DISPOSITION_DUB 0x0002
393#define AV_DISPOSITION_ORIGINAL 0x0004
394#define AV_DISPOSITION_COMMENT 0x0008
395#define AV_DISPOSITION_LYRICS 0x0010
396#define AV_DISPOSITION_KARAOKE 0x0020
397
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398/**
399 * Stream structure.
400 * New fields can be added to the end with minor version bumps.
8bfb108b 401 * Removal, reordering and changes to existing fields require a major
ba66ae94 402 * version bump.
8bfb108b 403 * sizeof(AVStream) must not be used outside libav*.
ba66ae94 404 */
de6d9b64 405typedef struct AVStream {
43d414ba 406 int index; /**< stream index in AVFormatContext */
4f57fa8c 407 int id; /**< format-specific stream ID */
43d414ba 408 AVCodecContext *codec; /**< codec context */
b4b87d48 409 /**
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410 * Real base frame rate of the stream.
411 * This is the lowest frame rate with which all timestamps can be
864ff8c1 412 * represented accurately (it is the least common multiple of all
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413 * frame rates in the stream). Note, this value is just a guess!
414 * For example if the time base is 1/90000 and all frames have either
415 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
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416 */
417 AVRational r_frame_rate;
de6d9b64 418 void *priv_data;
82583548 419
b9a281db 420 /* internal data used in av_find_stream_info() */
82583548 421 int64_t first_dts;
4f57fa8c 422 /** encoding: pts generation when outputting stream */
a9fd2b19 423 struct AVFrac pts;
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424
425 /**
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426 * This is the fundamental unit of time (in seconds) in terms
427 * of which frame timestamps are represented. For fixed-fps content,
4f57fa8c 428 * time base should be 1/frame rate and timestamp increments should be 1.
5b28c8c3 429 */
9ee91c2f 430 AVRational time_base;
43d414ba 431 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
a48b7a6b 432 /* ffmpeg.c private use */
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433 int stream_copy; /**< If set, just copy stream. */
434 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
b4aea108 435 //FIXME move stuff to a flags field?
4f57fa8c 436 /** Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
755bfeab 437 * MN: dunno if that is the right place for it */
115329f1 438 float quality;
6d96a9b9 439 /**
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440 * Decoding: pts of the first frame of the stream, in stream time base.
441 * Only set this if you are absolutely 100% sure that the value you set
442 * it to really is the pts of the first frame.
4854c253 443 * This may be undefined (AV_NOPTS_VALUE).
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444 * @note The ASF header does NOT contain a correct start_time the ASF
445 * demuxer must NOT set this.
6d96a9b9 446 */
115329f1 447 int64_t start_time;
e26381b6 448 /**
8bfb108b 449 * Decoding: duration of the stream, in stream time base.
e26381b6 450 * If a source file does not specify a duration, but does specify
4f57fa8c 451 * a bitrate, this value will be estimated from bitrate and file size.
e26381b6 452 */
ee404803 453 int64_t duration;
fb2758c8 454
43d414ba 455 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
09730260 456
fb2758c8 457 /* av_read_frame() support */
57004ff1 458 enum AVStreamParseType need_parsing;
fb2758c8 459 struct AVCodecParserContext *parser;
6ec87caa 460
fb2758c8 461 int64_t cur_dts;
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462 int last_IP_duration;
463 int64_t last_IP_pts;
fb2758c8 464 /* av_seek_frame() support */
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465 AVIndexEntry *index_entries; /**< Only used if the format does not
466 support seeking natively. */
fb2758c8 467 int nb_index_entries;
191e8ca7 468 unsigned int index_entries_allocated_size;
115329f1 469
b4b87d48 470 int64_t nb_frames; ///< number of frames in this stream if known or 0
504ee036 471
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472#if LIBAVFORMAT_VERSION_INT < (53<<16)
473 int64_t unused[4+1];
474#endif
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475
476 char *filename; /**< source filename of the stream */
90c2295b 477
4f57fa8c 478 int disposition; /**< AV_DISPOSITION_* bit field */
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479
480 AVProbeData probe_data;
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481#define MAX_REORDER_DELAY 16
482 int64_t pts_buffer[MAX_REORDER_DELAY+1];
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483
484 /**
485 * sample aspect ratio (0 if unknown)
486 * - encoding: Set by user.
487 * - decoding: Set by libavformat.
488 */
489 AVRational sample_aspect_ratio;
f526adaf 490
e232c252 491 AVMetadata *metadata;
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492
493 /* av_read_frame() support */
494 const uint8_t *cur_ptr;
495 int cur_len;
496 AVPacket cur_pkt;
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497
498 // Timestamp generation support:
499 /**
500 * Timestamp corresponding to the last dts sync point.
501 *
502 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
503 * a DTS is received from the underlying container. Otherwise set to
504 * AV_NOPTS_VALUE by default.
505 */
506 int64_t reference_dts;
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507} AVStream;
508
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509#define AV_PROGRAM_RUNNING 1
510
ba66ae94 511/**
ba66ae94 512 * New fields can be added to the end with minor version bumps.
8bfb108b 513 * Removal, reordering and changes to existing fields require a major
ba66ae94 514 * version bump.
8bfb108b 515 * sizeof(AVProgram) must not be used outside libav*.
ba66ae94 516 */
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517typedef struct AVProgram {
518 int id;
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519 char *provider_name; ///< network name for DVB streams
520 char *name; ///< service name for DVB streams
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521 int flags;
522 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
526efa10
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523 unsigned int *stream_index;
524 unsigned int nb_stream_indexes;
e232c252 525 AVMetadata *metadata;
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526} AVProgram;
527
43d414ba 528#define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
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529 (streams are added dynamically) */
530
79d7836a 531typedef struct AVChapter {
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532 int id; ///< unique ID to identify the chapter
533 AVRational time_base; ///< time base in which the start/end timestamps are specified
8931e7b4 534 int64_t start, end; ///< chapter start/end time in time_base units
c2fb6be4 535 char *title; ///< chapter title
e232c252 536 AVMetadata *metadata;
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537} AVChapter;
538
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539#define MAX_STREAMS 20
540
252f17e2 541/**
4f57fa8c 542 * Format I/O context.
252f17e2 543 * New fields can be added to the end with minor version bumps.
8bfb108b 544 * Removal, reordering and changes to existing fields require a major
252f17e2 545 * version bump.
8bfb108b 546 * sizeof(AVFormatContext) must not be used outside libav*.
252f17e2 547 */
de6d9b64 548typedef struct AVFormatContext {
1447aac4 549 const AVClass *av_class; /**< Set by avformat_alloc_context. */
4f57fa8c 550 /* Can only be iformat or oformat, not both at the same time. */
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551 struct AVInputFormat *iformat;
552 struct AVOutputFormat *oformat;
de6d9b64 553 void *priv_data;
899681cd 554 ByteIOContext *pb;
db69c2e5 555 unsigned int nb_streams;
de6d9b64 556 AVStream *streams[MAX_STREAMS];
43d414ba 557 char filename[1024]; /**< input or output filename */
de6d9b64 558 /* stream info */
4568325a 559 int64_t timestamp;
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560 char title[512];
561 char author[512];
562 char copyright[512];
563 char comment[512];
6a58e151 564 char album[512];
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565 int year; /**< ID3 year, 0 if none */
566 int track; /**< track number, 0 if none */
567 char genre[32]; /**< ID3 genre */
6a58e151 568
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569 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
570 /* private data for pts handling (do not modify directly). */
43d414ba 571 /** This buffer is only needed when packets were already buffered but
4f57fa8c
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572 not decoded, for example to get the codec parameters in MPEG
573 streams. */
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574 struct AVPacketList *packet_buffer;
575
4f57fa8c 576 /** Decoding: position of the first frame of the component, in
ee404803 577 AV_TIME_BASE fractional seconds. NEVER set this value directly:
4f57fa8c 578 It is deduced from the AVStream values. */
115329f1 579 int64_t start_time;
4f57fa8c 580 /** Decoding: duration of the stream, in AV_TIME_BASE fractional
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581 seconds. NEVER set this value directly: it is deduced from the
582 AVStream values. */
583 int64_t duration;
4f57fa8c 584 /** decoding: total file size, 0 if unknown */
ee404803 585 int64_t file_size;
4f57fa8c 586 /** Decoding: total stream bitrate in bit/s, 0 if not
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587 available. Never set it directly if the file_size and the
588 duration are known as ffmpeg can compute it automatically. */
589 int bit_rate;
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590
591 /* av_read_frame() support */
592 AVStream *cur_st;
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593#if LIBAVFORMAT_VERSION_INT < (53<<16)
594 const uint8_t *cur_ptr_deprecated;
595 int cur_len_deprecated;
596 AVPacket cur_pkt_deprecated;
597#endif
fb2758c8 598
fb2758c8 599 /* av_seek_frame() support */
43d414ba 600 int64_t data_offset; /** offset of the first packet */
fb2758c8 601 int index_built;
115329f1 602
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603 int mux_rate;
604 int packet_size;
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605 int preload;
606 int max_delay;
8108551a 607
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608#define AVFMT_NOOUTPUTLOOP -1
609#define AVFMT_INFINITEOUTPUTLOOP 0
43d414ba 610 /** number of times to loop output in formats that support it */
8108551a 611 int loop_output;
115329f1 612
30bc6613 613 int flags;
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614#define AVFMT_FLAG_GENPTS 0x0001 ///< Generate pts if missing even if it requires parsing future frames.
615#define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
616#define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
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617
618 int loop_input;
4f57fa8c 619 /** Decoding: size of data to probe; encoding: unused. */
9e6c9470 620 unsigned int probesize;
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621
622 /**
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623 * Maximum time (in AV_TIME_BASE units) during which the input should
624 * be analyzed in av_find_stream_info().
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625 */
626 int max_analyze_duration;
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627
628 const uint8_t *key;
629 int keylen;
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630
631 unsigned int nb_programs;
632 AVProgram **programs;
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633
634 /**
635 * Forced video codec_id.
4f57fa8c 636 * Demuxing: Set by user.
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637 */
638 enum CodecID video_codec_id;
639 /**
640 * Forced audio codec_id.
4f57fa8c 641 * Demuxing: Set by user.
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642 */
643 enum CodecID audio_codec_id;
644 /**
645 * Forced subtitle codec_id.
4f57fa8c 646 * Demuxing: Set by user.
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647 */
648 enum CodecID subtitle_codec_id;
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649
650 /**
651 * Maximum amount of memory in bytes to use per stream for the index.
4f57fa8c 652 * If the needed index exceeds this size, entries will be discarded as
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653 * needed to maintain a smaller size. This can lead to slower or less
654 * accurate seeking (depends on demuxer).
4f57fa8c 655 * Demuxers for which a full in-memory index is mandatory will ignore
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656 * this.
657 * muxing : unused
658 * demuxing: set by user
659 */
660 unsigned int max_index_size;
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661
662 /**
ffa71b2b 663 * Maximum amount of memory in bytes to use for buffering frames
4f57fa8c 664 * obtained from realtime capture devices.
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665 */
666 unsigned int max_picture_buffer;
79d7836a 667
fbabf1e9 668 unsigned int nb_chapters;
79d7836a 669 AVChapter **chapters;
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670
671 /**
4f57fa8c 672 * Flags to enable debugging.
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673 */
674 int debug;
675#define FF_FDEBUG_TS 0x0001
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676
677 /**
4f57fa8c 678 * Raw packets from the demuxer, prior to parsing and decoding.
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679 * This buffer is used for buffering packets until the codec can
680 * be identified, as parsing cannot be done without knowing the
681 * codec.
682 */
683 struct AVPacketList *raw_packet_buffer;
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MR
684 struct AVPacketList *raw_packet_buffer_end;
685
686 struct AVPacketList *packet_buffer_end;
47146dfb 687
e232c252 688 AVMetadata *metadata;
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689} AVFormatContext;
690
691typedef struct AVPacketList {
692 AVPacket pkt;
693 struct AVPacketList *next;
694} AVPacketList;
695
84be6e72 696#if LIBAVFORMAT_VERSION_INT < (53<<16)
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697extern AVInputFormat *first_iformat;
698extern AVOutputFormat *first_oformat;
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699#endif
700
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701/**
702 * If f is NULL, returns the first registered input format,
c1b02101 703 * if f is non-NULL, returns the next registered input format after f,
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704 * or NULL if f is the last one.
705 */
84be6e72 706AVInputFormat *av_iformat_next(AVInputFormat *f);
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707
708/**
709 * If f is NULL, returns the first registered output format,
c1b02101 710 * if f is non-NULL, returns the next registered output format after f,
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711 * or NULL if f is the last one.
712 */
84be6e72 713AVOutputFormat *av_oformat_next(AVOutputFormat *f);
de6d9b64 714
5b6d5596 715enum CodecID av_guess_image2_codec(const char *filename);
290c5fa6 716
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717/* XXX: use automatic init with either ELF sections or C file parser */
718/* modules */
de6d9b64 719
b9a281db 720/* utils.c */
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721void av_register_input_format(AVInputFormat *format);
722void av_register_output_format(AVOutputFormat *format);
115329f1 723AVOutputFormat *guess_stream_format(const char *short_name,
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724 const char *filename,
725 const char *mime_type);
115329f1 726AVOutputFormat *guess_format(const char *short_name,
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727 const char *filename,
728 const char *mime_type);
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729
730/**
4f57fa8c 731 * Guesses the codec ID based upon muxer and filename.
3217cb42 732 */
115329f1 733enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
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734 const char *filename, const char *mime_type,
735 enum CodecType type);
de6d9b64 736
3217cb42 737/**
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738 * Send a nice hexadecimal dump of a buffer to the specified file stream.
739 *
740 * @param f The file stream pointer where the dump should be sent to.
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741 * @param buf buffer
742 * @param size buffer size
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743 *
744 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
3217cb42 745 */
fb2758c8 746void av_hex_dump(FILE *f, uint8_t *buf, int size);
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747
748/**
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749 * Send a nice hexadecimal dump of a buffer to the log.
750 *
751 * @param avcl A pointer to an arbitrary struct of which the first field is a
752 * pointer to an AVClass struct.
753 * @param level The importance level of the message, lower values signifying
754 * higher importance.
755 * @param buf buffer
756 * @param size buffer size
757 *
758 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
759 */
760void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
761
762/**
763 * Send a nice dump of a packet to the specified file stream.
764 *
765 * @param f The file stream pointer where the dump should be sent to.
3217cb42 766 * @param pkt packet to dump
4f57fa8c 767 * @param dump_payload True if the payload must be displayed, too.
3217cb42 768 */
fb2758c8 769void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
de6d9b64 770
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771/**
772 * Send a nice dump of a packet to the log.
773 *
774 * @param avcl A pointer to an arbitrary struct of which the first field is a
775 * pointer to an AVClass struct.
776 * @param level The importance level of the message, lower values signifying
777 * higher importance.
778 * @param pkt packet to dump
4f57fa8c 779 * @param dump_payload True if the payload must be displayed, too.
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780 */
781void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
782
4815e246
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783/**
784 * Initialize libavformat and register all the muxers, demuxers and
785 * protocols. If you do not call this function, then you can select
786 * exactly which formats you want to support.
787 *
788 * @see av_register_input_format()
789 * @see av_register_output_format()
5d377501 790 * @see av_register_protocol()
4815e246 791 */
94988531 792void av_register_all(void);
de6d9b64 793
43d414ba 794/** codec tag <-> codec id */
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795enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
796unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
7caf0cc6 797
b9a281db 798/* media file input */
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799
800/**
4f57fa8c 801 * Finds AVInputFormat based on the short name of the input format.
3217cb42 802 */
b9a281db 803AVInputFormat *av_find_input_format(const char *short_name);
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804
805/**
806 * Guess file format.
807 *
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DB
808 * @param is_opened Whether the file is already opened; determines whether
809 * demuxers with or without AVFMT_NOFILE are probed.
3217cb42 810 */
94988531 811AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
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812
813/**
814 * Allocates all the structures needed to read an input stream.
815 * This does not open the needed codecs for decoding the stream[s].
816 */
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817int av_open_input_stream(AVFormatContext **ic_ptr,
818 ByteIOContext *pb, const char *filename,
da24c5e3 819 AVInputFormat *fmt, AVFormatParameters *ap);
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820
821/**
864ff8c1 822 * Open a media file as input. The codecs are not opened. Only the file
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823 * header (if present) is read.
824 *
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DB
825 * @param ic_ptr The opened media file handle is put here.
826 * @param filename filename to open
827 * @param fmt If non-NULL, force the file format to use.
3217cb42 828 * @param buf_size optional buffer size (zero if default is OK)
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829 * @param ap Additional parameters needed when opening the file
830 * (NULL if default).
4f57fa8c 831 * @return 0 if OK, AVERROR_xxx otherwise
3217cb42 832 */
115329f1 833int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
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834 AVInputFormat *fmt,
835 int buf_size,
836 AVFormatParameters *ap);
88a28965
SS
837
838#if LIBAVFORMAT_VERSION_MAJOR < 53
839/**
840 * @deprecated Use avformat_alloc_context() instead.
841 */
842attribute_deprecated AVFormatContext *av_alloc_format_context(void);
843#endif
844
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845/**
846 * Allocate an AVFormatContext.
5d81d641 847 * Can be freed with av_free() but do not forget to free everything you
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848 * explicitly allocated as well!
849 */
88a28965 850AVFormatContext *avformat_alloc_context(void);
b9a281db 851
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852/**
853 * Read packets of a media file to get stream information. This
854 * is useful for file formats with no headers such as MPEG. This
4f57fa8c 855 * function also computes the real frame rate in case of MPEG-2 repeat
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856 * frame mode.
857 * The logical file position is not changed by this function;
858 * examined packets may be buffered for later processing.
859 *
860 * @param ic media file handle
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DB
861 * @return >=0 if OK, AVERROR_xxx on error
862 * @todo Let the user decide somehow what information is needed so that
863 * we do not waste time getting stuff the user does not need.
3217cb42 864 */
b9a281db 865int av_find_stream_info(AVFormatContext *ic);
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866
867/**
868 * Read a transport packet from a media file.
869 *
864ff8c1 870 * This function is obsolete and should never be used.
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871 * Use av_read_frame() instead.
872 *
873 * @param s media file handle
874 * @param pkt is filled
4f57fa8c 875 * @return 0 if OK, AVERROR_xxx on error
3217cb42 876 */
de6d9b64 877int av_read_packet(AVFormatContext *s, AVPacket *pkt);
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878
879/**
880 * Return the next frame of a stream.
881 *
882 * The returned packet is valid
883 * until the next av_read_frame() or until av_close_input_file() and
884 * must be freed with av_free_packet. For video, the packet contains
885 * exactly one frame. For audio, it contains an integer number of
886 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
887 * data). If the audio frames have a variable size (e.g. MPEG audio),
888 * then it contains one frame.
889 *
890 * pkt->pts, pkt->dts and pkt->duration are always set to correct
a050f802 891 * values in AVStream.timebase units (and guessed if the format cannot
4f57fa8c
DB
892 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
893 * has B-frames, so it is better to rely on pkt->dts if you do not
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894 * decompress the payload.
895 *
4f57fa8c 896 * @return 0 if OK, < 0 on error or end of file
3217cb42 897 */
fb2758c8 898int av_read_frame(AVFormatContext *s, AVPacket *pkt);
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899
900/**
901 * Seek to the key frame at timestamp.
902 * 'timestamp' in 'stream_index'.
903 * @param stream_index If stream_index is (-1), a default
904 * stream is selected, and timestamp is automatically converted
905 * from AV_TIME_BASE units to the stream specific time_base.
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906 * @param timestamp Timestamp in AVStream.time_base units
907 * or, if no stream is specified, in AV_TIME_BASE units.
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908 * @param flags flags which select direction and seeking mode
909 * @return >= 0 on success
910 */
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911int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
912 int flags);
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913
914/**
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915 * Seek to timestamp ts.
916 * Seeking will be done so that the point from which all active streams
917 * can be presented successfully will be closest to ts and within min/max_ts.
918 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
919 *
920 * if flags contain AVSEEK_FLAG_BYTE then all timestamps are in byte and
921 * are the file position (this may not be supported by all demuxers).
922 * if flags contain AVSEEK_FLAG_FRAME then all timestamps are in frames
923 * in the stream with stream_index (this may not be supported by all demuxers).
924 * else all timestamps are in units of the stream selected by stream_index or
f0b00aba 925 * if stream_index is -1, AV_TIME_BASE units.
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926 * if flags contain AVSEEK_FLAG_ANY then non keyframes are treated as
927 * keyframes (this may not be supported by all demuxers).
928 *
929 * @param stream_index index of the stream which is used as timebase reference.
930 * @param min_ts smallest acceptable timestamp
931 * @param ts target timestamp
932 * @param max_ts largest acceptable timestamp
933 * @param flags flags
934 * @returns >=0 on success, error code otherwise
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935 *
936 * @NOTE this is part of the new seek API which is still under construction
937 * thus do not use this yet it may change any time, dont expect ABI
938 * compatibility yet!
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939 */
940int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
941
942/**
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943 * Start playing a network based stream (e.g. RTSP stream) at the
944 * current position.
3217cb42 945 */
fb2758c8 946int av_read_play(AVFormatContext *s);
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947
948/**
949 * Pause a network based stream (e.g. RTSP stream).
950 *
951 * Use av_read_play() to resume it.
952 */
fb2758c8 953int av_read_pause(AVFormatContext *s);
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954
955/**
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956 * Free a AVFormatContext allocated by av_open_input_stream.
957 * @param s context to free
958 */
959void av_close_input_stream(AVFormatContext *s);
960
961/**
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962 * Close a media file (but not its codecs).
963 *
964 * @param s media file handle
965 */
de6d9b64 966void av_close_input_file(AVFormatContext *s);
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967
968/**
969 * Add a new stream to a media file.
970 *
971 * Can only be called in the read_header() function. If the flag
972 * AVFMTCTX_NOHEADER is in the format context, then new streams
973 * can be added in read_packet too.
974 *
975 * @param s media file handle
4f57fa8c 976 * @param id file-format-dependent stream ID
3217cb42 977 */
b9a281db 978AVStream *av_new_stream(AVFormatContext *s, int id);
15afa396 979AVProgram *av_new_program(AVFormatContext *s, int id);
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980
981/**
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982 * Add a new chapter.
983 * This function is NOT part of the public API
4f57fa8c 984 * and should ONLY be used by demuxers.
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985 *
986 * @param s media file handle
4f57fa8c 987 * @param id unique ID for this chapter
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988 * @param start chapter start time in time_base units
989 * @param end chapter end time in time_base units
79d7836a 990 * @param title chapter title
5c37f43a 991 *
4f57fa8c 992 * @return AVChapter or NULL on error
79d7836a 993 */
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994AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
995 int64_t start, int64_t end, const char *title);
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996
997/**
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998 * Set the pts for a given stream.
999 *
1000 * @param s stream
1001 * @param pts_wrap_bits number of bits effectively used by the pts
1002 * (used for wrap control, 33 is the value for MPEG)
1003 * @param pts_num numerator to convert to seconds (MPEG: 1)
1004 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1005 */
9ee91c2f 1006void av_set_pts_info(AVStream *s, int pts_wrap_bits,
916c80e9 1007 int pts_num, int pts_den);
de6d9b64 1008
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1009#define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1010#define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
4f57fa8c 1011#define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
3ba1438d 1012
b754978a 1013int av_find_default_stream_index(AVFormatContext *s);
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1014
1015/**
1016 * Gets the index for a specific timestamp.
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1017 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1018 * to the timestamp which is <= the requested one, if backward
1019 * is 0, then it will be >=
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1020 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1021 * @return < 0 if no such timestamp could be found
1022 */
dc56fc38 1023int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
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1024
1025/**
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1026 * Ensures the index uses less memory than the maximum specified in
1027 * AVFormatContext.max_index_size, by discarding entries if it grows
1028 * too large.
1029 * This function is not part of the public API and should only be called
1030 * by demuxers.
1031 */
1032void ff_reduce_index(AVFormatContext *s, int stream_index);
1033
1034/**
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1035 * Add an index entry into a sorted list. Update the entry if the list
1036 * already contains it.
3217cb42 1037 *
4f57fa8c 1038 * @param timestamp timestamp in the time base of the given stream
3217cb42 1039 */
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1040int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1041 int size, int distance, int flags);
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1042
1043/**
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1044 * Does a binary search using av_index_search_timestamp() and
1045 * AVCodec.read_timestamp().
1046 * This is not supposed to be called directly by a user application,
1047 * but by demuxers.
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1048 * @param target_ts target timestamp in the time base of the given stream
1049 * @param stream_index stream number
1050 */
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1051int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1052 int64_t target_ts, int flags);
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PI
1053
1054/**
4f57fa8c 1055 * Updates cur_dts of all streams based on the given timestamp and AVStream.
3217cb42 1056 *
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DB
1057 * Stream ref_st unchanged, others set cur_dts in their native time base.
1058 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
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1059 * @param timestamp new dts expressed in time_base of param ref_st
1060 * @param ref_st reference stream giving time_base of param timestamp
1061 */
22ffac70 1062void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
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1063
1064/**
1065 * Does a binary search using read_timestamp().
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1066 * This is not supposed to be called directly by a user application,
1067 * but by demuxers.
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1068 * @param target_ts target timestamp in the time base of the given stream
1069 * @param stream_index stream number
1070 */
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1071int64_t av_gen_search(AVFormatContext *s, int stream_index,
1072 int64_t target_ts, int64_t pos_min,
1073 int64_t pos_max, int64_t pos_limit,
1074 int64_t ts_min, int64_t ts_max,
1075 int flags, int64_t *ts_ret,
1076 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
b754978a 1077
43d414ba 1078/** media file output */
290c5fa6 1079int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
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1080
1081/**
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DB
1082 * Allocate the stream private data and write the stream header to an
1083 * output media file.
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1084 *
1085 * @param s media file handle
4f57fa8c 1086 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1087 */
b9a281db 1088int av_write_header(AVFormatContext *s);
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1089
1090/**
1091 * Write a packet to an output media file.
1092 *
1093 * The packet shall contain one audio or video frame.
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1094 * The packet must be correctly interleaved according to the container
1095 * specification, if not then av_interleaved_write_frame must be used.
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1096 *
1097 * @param s media file handle
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1098 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1099 dts/pts, ...
4f57fa8c 1100 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
3217cb42 1101 */
e928649b 1102int av_write_frame(AVFormatContext *s, AVPacket *pkt);
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1103
1104/**
1105 * Writes a packet to an output media file ensuring correct interleaving.
1106 *
1107 * The packet must contain one audio or video frame.
1108 * If the packets are already correctly interleaved the application should
90b5b51e
DB
1109 * call av_write_frame() instead as it is slightly faster. It is also important
1110 * to keep in mind that completely non-interleaved input will need huge amounts
1111 * of memory to interleave with this, so it is preferable to interleave at the
1112 * demuxer level.
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1113 *
1114 * @param s media file handle
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1115 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1116 dts/pts, ...
4f57fa8c 1117 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
3217cb42 1118 */
3c895fc0 1119int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
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1120
1121/**
4f57fa8c 1122 * Interleave a packet per dts in an output media file.
3217cb42 1123 *
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1124 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1125 * function, so they cannot be used after it, note calling av_free_packet()
1126 * on them is still safe.
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1127 *
1128 * @param s media file handle
1129 * @param out the interleaved packet will be output here
1130 * @param in the input packet
1131 * @param flush 1 if no further packets are available as input and all
1132 * remaining packets should be output
1133 * @return 1 if a packet was output, 0 if no packet could be output,
d9526386 1134 * < 0 if an error occurred
3217cb42 1135 */
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1136int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1137 AVPacket *pkt, int flush);
e928649b 1138
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1139/**
1140 * @brief Write the stream trailer to an output media file and
1141 * free the file private data.
1142 *
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RD
1143 * May only be called after a successful call to av_write_header.
1144 *
3217cb42 1145 * @param s media file handle
4f57fa8c 1146 * @return 0 if OK, AVERROR_xxx on error
3217cb42 1147 */
b9a281db 1148int av_write_trailer(AVFormatContext *s);
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FB
1149
1150void dump_format(AVFormatContext *ic,
115329f1 1151 int index,
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FB
1152 const char *url,
1153 int is_output);
3217cb42 1154
1ca9133f 1155#if LIBAVFORMAT_VERSION_MAJOR < 53
3217cb42 1156/**
4f57fa8c 1157 * Parses width and height out of string str.
26ef3220 1158 * @deprecated Use av_parse_video_frame_size instead.
3217cb42 1159 */
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1160attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1161 const char *str);
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1162
1163/**
1164 * Converts frame rate from string to a fraction.
26ef3220 1165 * @deprecated Use av_parse_video_frame_rate instead.
3217cb42 1166 */
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1167attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1168 const char *arg);
1ca9133f 1169#endif
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1170
1171/**
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SS
1172 * Parses \p datestr and returns a corresponding number of microseconds.
1173 * @param datestr String representing a date or a duration.
1174 * - If a date the syntax is:
3217cb42 1175 * @code
3217cb42 1176 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
3217cb42 1177 * @endcode
4f57fa8c 1178 * Time is local time unless Z is appended, in which case it is
f9436161 1179 * interpreted as UTC.
4f57fa8c 1180 * If the year-month-day part is not specified it takes the current
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SS
1181 * year-month-day.
1182 * Returns the number of microseconds since 1st of January, 1970 up to
1183 * the time of the parsed date or INT64_MIN if \p datestr cannot be
1184 * successfully parsed.
1185 * - If a duration the syntax is:
1186 * @code
1187 * [-]HH[:MM[:SS[.m...]]]
1188 * [-]S+[.m...]
1189 * @endcode
1190 * Returns the number of microseconds contained in a time interval
1191 * with the specified duration or INT64_MIN if \p datestr cannot be
7338d368 1192 * successfully parsed.
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SS
1193 * @param duration Flag which tells how to interpret \p datestr, if
1194 * not zero \p datestr is interpreted as a duration, otherwise as a
1195 * date.
3217cb42 1196 */
0c1a9eda 1197int64_t parse_date(const char *datestr, int duration);
de6d9b64 1198
fff5e687 1199/** Gets the current time in microseconds. */
0c1a9eda 1200int64_t av_gettime(void);
94988531 1201
4f57fa8c 1202/* ffm-specific for ffserver */
de6d9b64 1203#define FFM_PACKET_SIZE 4096
bc5c918e 1204int64_t ffm_read_write_index(int fd);
6fcce4f9 1205int ffm_write_write_index(int fd, int64_t pos);
bc5c918e 1206void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
de6d9b64 1207
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1208/**
1209 * Attempts to find a specific tag in a URL.
1210 *
1211 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1212 * Return 1 if found.
1213 */
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1214int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1215
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1216/**
1217 * Returns in 'buf' the path with '%d' replaced by number.
4f57fa8c 1218 *
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1219 * Also handles the '%0nd' format where 'n' is the total number
1220 * of digits and '%%'.
1221 *
1222 * @param buf destination buffer
1223 * @param buf_size destination buffer size
1224 * @param path numbered sequence string
8ea0e802 1225 * @param number frame number
4f57fa8c 1226 * @return 0 if OK, -1 on format error
3217cb42 1227 */
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1228int av_get_frame_filename(char *buf, int buf_size,
1229 const char *path, int number);
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1230
1231/**
1232 * Check whether filename actually is a numbered sequence generator.
1233 *
1234 * @param filename possible numbered sequence string
4f57fa8c 1235 * @return 1 if a valid numbered sequence string, 0 otherwise
3217cb42 1236 */
5c07cf53 1237int av_filename_number_test(const char *filename);
96baaa6a 1238
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LA
1239/**
1240 * Generate an SDP for an RTP session.
1241 *
1242 * @param ac array of AVFormatContexts describing the RTP streams. If the
1243 * array is composed by only one context, such context can contain
1244 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1245 * all the contexts in the array (an AVCodecContext per RTP stream)
4f57fa8c 1246 * must contain only one AVStream.
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1247 * @param n_files number of AVCodecContexts contained in ac
1248 * @param buff buffer where the SDP will be stored (must be allocated by
4f57fa8c 1249 * the caller)
8767b80f 1250 * @param size the size of the buffer
4f57fa8c 1251 * @return 0 if OK, AVERROR_xxx on error
c5388c07 1252 */
8767b80f 1253int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
c5388c07 1254
fb025625 1255#ifdef HAVE_AV_CONFIG_H
f71869a4 1256
2db5da97 1257void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem);
39f472c3 1258
e4e70d2e 1259#ifdef __GNUC__
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FB
1260#define dynarray_add(tab, nb_ptr, elem)\
1261do {\
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DP
1262 __typeof__(tab) _tab = (tab);\
1263 __typeof__(elem) _elem = (elem);\
39f472c3 1264 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
2db5da97 1265 ff_dynarray_add((intptr_t **)_tab, nb_ptr, (intptr_t)_elem);\
39f472c3 1266} while(0)
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FH
1267#else
1268#define dynarray_add(tab, nb_ptr, elem)\
1269do {\
2db5da97 1270 ff_dynarray_add((intptr_t **)(tab), nb_ptr, (intptr_t)(elem));\
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FH
1271} while(0)
1272#endif
39f472c3 1273
f71869a4 1274time_t mktimegm(struct tm *tm);
0c9fc6e1 1275struct tm *brktimegm(time_t secs, struct tm *tm);
115329f1 1276const char *small_strptime(const char *p, const char *fmt,
f71869a4
FB
1277 struct tm *dt);
1278
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FB
1279struct in_addr;
1280int resolve_host(struct in_addr *sin_addr, const char *hostname);
1281
1282void url_split(char *proto, int proto_size,
6ba5cbc6 1283 char *authorization, int authorization_size,
fb025625
FB
1284 char *hostname, int hostname_size,
1285 int *port_ptr,
1286 char *path, int path_size,
1287 const char *url);
1288
a941f391
FB
1289int match_ext(const char *filename, const char *extensions);
1290
fb025625
FB
1291#endif /* HAVE_AV_CONFIG_H */
1292
98790382 1293#endif /* AVFORMAT_AVFORMAT_H */