7bc20c01ecb444418fd4a54568ad3c10c67f78fa
[libav.git] / libavformat / avformat.h
1 /*
2 * copyright (c) 2001 Fabrice Bellard
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #ifndef AVFORMAT_AVFORMAT_H
22 #define AVFORMAT_AVFORMAT_H
23
24 #define LIBAVFORMAT_VERSION_MAJOR 52
25 #define LIBAVFORMAT_VERSION_MINOR 30
26 #define LIBAVFORMAT_VERSION_MICRO 0
27
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)
34 #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
35
36 #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
37
38 /**
39 * Returns the LIBAVFORMAT_VERSION_INT constant.
40 */
41 unsigned avformat_version(void);
42
43 #include <time.h>
44 #include <stdio.h> /* FILE */
45 #include "libavcodec/avcodec.h"
46
47 #include "avio.h"
48
49
50 /*
51 * Public Metadata API.
52 * !!WARNING!! This is a work in progress. Don't use outside FFmpeg for now.
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.
68 * A demuxer should set a default if it sets any translated tag.
69 */
70
71 #define AV_METADATA_MATCH_CASE 1
72 #define AV_METADATA_IGNORE_SUFFIX 2
73
74 typedef struct {
75 char *key;
76 char *value;
77 }AVMetadataTag;
78
79 typedef struct AVMetadata AVMetadata;
80
81 /**
82 * gets a metadata element with matching key.
83 * @param prev set to the previous matching element to find the next.
84 * @param flags allows case as well as suffix insensitive comparisons.
85 * @return found tag or NULL, changing key or value leads to undefined behavior.
86 */
87 AVMetadataTag *
88 av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int flags);
89
90 /**
91 * sets the given tag in m, overwriting an existing tag.
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).
94 * @return >= 0 if success otherwise error code that is <0.
95 */
96 int av_metadata_set(AVMetadata **pm, const char *key, const char *value);
97
98 /**
99 * Free all the memory allocated for an AVMetadata struct.
100 */
101 void av_metadata_free(AVMetadata **m);
102
103
104 /* packet functions */
105
106 typedef struct AVPacket {
107 /**
108 * Presentation timestamp in time_base units.
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.
112 * pts MUST be larger or equal to dts as presentation cannot happen before
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 /**
119 * Decompression timestamp in time_base units.
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;
124 uint8_t *data;
125 int size;
126 int stream_index;
127 int flags;
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;
133 void (*destruct)(struct AVPacket *);
134 void *priv;
135 int64_t pos; ///< byte position in stream, -1 if unknown
136
137 /**
138 * Time difference in stream time base units from the pts of this
139 * packet to the point at which the output from the decoder has converged
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.
144 * This field is not the display duration of the current packet.
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
148 * recovery point SEI in H.264 and match_time_delta in NUT. It is also
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;
153 } AVPacket;
154 #define PKT_FLAG_KEY 0x0001
155
156 void av_destruct_packet_nofree(AVPacket *pkt);
157
158 /**
159 * Default packet destructor.
160 */
161 void av_destruct_packet(AVPacket *pkt);
162
163 /**
164 * Initialize optional fields of a packet with default values.
165 *
166 * @param pkt packet
167 */
168 void av_init_packet(AVPacket *pkt);
169
170 /**
171 * Allocate the payload of a packet and initialize its fields with
172 * default values.
173 *
174 * @param pkt packet
175 * @param size wanted payload size
176 * @return 0 if OK, AVERROR_xxx otherwise
177 */
178 int av_new_packet(AVPacket *pkt, int size);
179
180 /**
181 * Allocate and read the payload of a packet and initialize its fields with
182 * default values.
183 *
184 * @param pkt packet
185 * @param size desired payload size
186 * @return >0 (read size) if OK, AVERROR_xxx otherwise
187 */
188 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
189
190 /**
191 * @warning This is a hack - the packet memory allocation stuff is broken. The
192 * packet is allocated if it was not really allocated.
193 */
194 int av_dup_packet(AVPacket *pkt);
195
196 /**
197 * Free a packet.
198 *
199 * @param pkt packet to free
200 */
201 static inline void av_free_packet(AVPacket *pkt)
202 {
203 if (pkt && pkt->destruct) {
204 pkt->destruct(pkt);
205 }
206 }
207
208 /*************************************************/
209 /* fractional numbers for exact pts handling */
210
211 /**
212 * The exact value of the fractional number is: 'val + num / den'.
213 * num is assumed to be 0 <= num < den.
214 */
215 typedef struct AVFrac {
216 int64_t val, num, den;
217 } AVFrac;
218
219 /*************************************************/
220 /* input/output formats */
221
222 struct AVCodecTag;
223
224 struct AVFormatContext;
225
226 /** This structure contains the data a format has to probe a file. */
227 typedef struct AVProbeData {
228 const char *filename;
229 unsigned char *buf;
230 int buf_size;
231 } AVProbeData;
232
233 #define AVPROBE_SCORE_MAX 100 ///< Maximum score, half of that is used for file-extension-based detection.
234 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
235
236 typedef struct AVFormatParameters {
237 AVRational time_base;
238 int sample_rate;
239 int channels;
240 int width;
241 int height;
242 enum PixelFormat pix_fmt;
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
247 stream packet (only meaningful if
248 mpeg2ts_raw is TRUE). */
249 unsigned int initial_pause:1; /**< Do not begin to play the stream
250 immediately (RTSP only). */
251 unsigned int prealloced_context:1;
252 #if LIBAVFORMAT_VERSION_INT < (53<<16)
253 enum CodecID video_codec_id;
254 enum CodecID audio_codec_id;
255 #endif
256 } AVFormatParameters;
257
258 //! Demuxer will use url_fopen, no opened file should be provided by the caller.
259 #define AVFMT_NOFILE 0x0001
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. */
268 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
269
270 typedef struct AVOutputFormat {
271 const char *name;
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 */
277 const char *long_name;
278 const char *mime_type;
279 const char *extensions; /**< comma-separated filename extensions */
280 /** Size of private data so that it can be allocated in the wrapper. */
281 int priv_data_size;
282 /* output support */
283 enum CodecID audio_codec; /**< default audio codec */
284 enum CodecID video_codec; /**< default video codec */
285 int (*write_header)(struct AVFormatContext *);
286 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
287 int (*write_trailer)(struct AVFormatContext *);
288 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
289 int flags;
290 /** Currently only used to set pixel format if not YUV420P. */
291 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
292 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
293 AVPacket *in, int flush);
294
295 /**
296 * List of supported codec_id-codec_tag pairs, ordered by "better
297 * choice first". The arrays are all CODEC_ID_NONE terminated.
298 */
299 const struct AVCodecTag * const *codec_tag;
300
301 enum CodecID subtitle_codec; /**< default subtitle codec */
302
303 /* private fields */
304 struct AVOutputFormat *next;
305 } AVOutputFormat;
306
307 typedef struct AVInputFormat {
308 const char *name;
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 */
314 const char *long_name;
315 /** Size of private data so that it can be allocated in the wrapper. */
316 int priv_data_size;
317 /**
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.
321 */
322 int (*read_probe)(AVProbeData *);
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
326 now. 'av_new_stream' should be called to create new streams. */
327 int (*read_header)(struct AVFormatContext *,
328 AVFormatParameters *ap);
329 /** Read one packet and put it in 'pkt'. pts and flags are also
330 set. 'av_new_stream' can be called only if the flag
331 AVFMTCTX_NOHEADER is used. */
332 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
333 /** Close the stream. The AVFormatContext and AVStreams are not
334 freed by this function */
335 int (*read_close)(struct AVFormatContext *);
336
337 #if LIBAVFORMAT_VERSION_MAJOR < 53
338 /**
339 * Seek to a given timestamp relative to the frames in
340 * stream component stream_index.
341 * @param stream_index must not be -1
342 * @param flags selects which direction should be preferred if no exact
343 * match is available
344 * @return >= 0 on success (but not necessarily the new offset)
345 */
346 int (*read_seek)(struct AVFormatContext *,
347 int stream_index, int64_t timestamp, int flags);
348 #endif
349 /**
350 * Gets the next timestamp in stream[stream_index].time_base units.
351 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
352 */
353 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
354 int64_t *pos, int64_t pos_limit);
355 /** Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER. */
356 int flags;
357 /** If extensions are defined, then no probe is done. You should
358 usually not use extension format guessing because it is not
359 reliable enough */
360 const char *extensions;
361 /** General purpose read-only value that the format can use. */
362 int value;
363
364 /** Start/resume playing - only meaningful if using a network-based format
365 (RTSP). */
366 int (*read_play)(struct AVFormatContext *);
367
368 /** Pause playing - only meaningful if using a network-based format
369 (RTSP). */
370 int (*read_pause)(struct AVFormatContext *);
371
372 const struct AVCodecTag * const *codec_tag;
373
374 /**
375 * Seek to timestamp ts.
376 * Seeking will be done so that the point from which all active streams
377 * can be presented successfully will be closest to ts and within min/max_ts.
378 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
379 */
380 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
381
382 /* private fields */
383 struct AVInputFormat *next;
384 } AVInputFormat;
385
386 enum AVStreamParseType {
387 AVSTREAM_PARSE_NONE,
388 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
389 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
390 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
391 };
392
393 typedef struct AVIndexEntry {
394 int64_t pos;
395 int64_t timestamp;
396 #define AVINDEX_KEYFRAME 0x0001
397 int flags:2;
398 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).
399 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
400 } AVIndexEntry;
401
402 #define AV_DISPOSITION_DEFAULT 0x0001
403 #define AV_DISPOSITION_DUB 0x0002
404 #define AV_DISPOSITION_ORIGINAL 0x0004
405 #define AV_DISPOSITION_COMMENT 0x0008
406 #define AV_DISPOSITION_LYRICS 0x0010
407 #define AV_DISPOSITION_KARAOKE 0x0020
408
409 /**
410 * Stream structure.
411 * New fields can be added to the end with minor version bumps.
412 * Removal, reordering and changes to existing fields require a major
413 * version bump.
414 * sizeof(AVStream) must not be used outside libav*.
415 */
416 typedef struct AVStream {
417 int index; /**< stream index in AVFormatContext */
418 int id; /**< format-specific stream ID */
419 AVCodecContext *codec; /**< codec context */
420 /**
421 * Real base frame rate of the stream.
422 * This is the lowest frame rate with which all timestamps can be
423 * represented accurately (it is the least common multiple of all
424 * frame rates in the stream). Note, this value is just a guess!
425 * For example if the time base is 1/90000 and all frames have either
426 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
427 */
428 AVRational r_frame_rate;
429 void *priv_data;
430
431 /* internal data used in av_find_stream_info() */
432 int64_t first_dts;
433 /** encoding: pts generation when outputting stream */
434 struct AVFrac pts;
435
436 /**
437 * This is the fundamental unit of time (in seconds) in terms
438 * of which frame timestamps are represented. For fixed-fps content,
439 * time base should be 1/frame rate and timestamp increments should be 1.
440 */
441 AVRational time_base;
442 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
443 /* ffmpeg.c private use */
444 int stream_copy; /**< If set, just copy stream. */
445 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
446 //FIXME move stuff to a flags field?
447 /** Quality, as it has been removed from AVCodecContext and put in AVVideoFrame.
448 * MN: dunno if that is the right place for it */
449 float quality;
450 /**
451 * Decoding: pts of the first frame of the stream, in stream time base.
452 * Only set this if you are absolutely 100% sure that the value you set
453 * it to really is the pts of the first frame.
454 * This may be undefined (AV_NOPTS_VALUE).
455 * @note The ASF header does NOT contain a correct start_time the ASF
456 * demuxer must NOT set this.
457 */
458 int64_t start_time;
459 /**
460 * Decoding: duration of the stream, in stream time base.
461 * If a source file does not specify a duration, but does specify
462 * a bitrate, this value will be estimated from bitrate and file size.
463 */
464 int64_t duration;
465
466 char language[4]; /** ISO 639 3-letter language code (empty string if undefined) */
467
468 /* av_read_frame() support */
469 enum AVStreamParseType need_parsing;
470 struct AVCodecParserContext *parser;
471
472 int64_t cur_dts;
473 int last_IP_duration;
474 int64_t last_IP_pts;
475 /* av_seek_frame() support */
476 AVIndexEntry *index_entries; /**< Only used if the format does not
477 support seeking natively. */
478 int nb_index_entries;
479 unsigned int index_entries_allocated_size;
480
481 int64_t nb_frames; ///< number of frames in this stream if known or 0
482
483 #if LIBAVFORMAT_VERSION_INT < (53<<16)
484 int64_t unused[4+1];
485 #endif
486
487 char *filename; /**< source filename of the stream */
488
489 int disposition; /**< AV_DISPOSITION_* bit field */
490
491 AVProbeData probe_data;
492 #define MAX_REORDER_DELAY 16
493 int64_t pts_buffer[MAX_REORDER_DELAY+1];
494
495 /**
496 * sample aspect ratio (0 if unknown)
497 * - encoding: Set by user.
498 * - decoding: Set by libavformat.
499 */
500 AVRational sample_aspect_ratio;
501
502 AVMetadata *metadata;
503
504 /* av_read_frame() support */
505 const uint8_t *cur_ptr;
506 int cur_len;
507 AVPacket cur_pkt;
508
509 // Timestamp generation support:
510 /**
511 * Timestamp corresponding to the last dts sync point.
512 *
513 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
514 * a DTS is received from the underlying container. Otherwise set to
515 * AV_NOPTS_VALUE by default.
516 */
517 int64_t reference_dts;
518 } AVStream;
519
520 #define AV_PROGRAM_RUNNING 1
521
522 /**
523 * New fields can be added to the end with minor version bumps.
524 * Removal, reordering and changes to existing fields require a major
525 * version bump.
526 * sizeof(AVProgram) must not be used outside libav*.
527 */
528 typedef struct AVProgram {
529 int id;
530 char *provider_name; ///< network name for DVB streams
531 char *name; ///< service name for DVB streams
532 int flags;
533 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
534 unsigned int *stream_index;
535 unsigned int nb_stream_indexes;
536 AVMetadata *metadata;
537 } AVProgram;
538
539 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
540 (streams are added dynamically) */
541
542 typedef struct AVChapter {
543 int id; ///< unique ID to identify the chapter
544 AVRational time_base; ///< time base in which the start/end timestamps are specified
545 int64_t start, end; ///< chapter start/end time in time_base units
546 char *title; ///< chapter title
547 AVMetadata *metadata;
548 } AVChapter;
549
550 #define MAX_STREAMS 20
551
552 /**
553 * Format I/O context.
554 * New fields can be added to the end with minor version bumps.
555 * Removal, reordering and changes to existing fields require a major
556 * version bump.
557 * sizeof(AVFormatContext) must not be used outside libav*.
558 */
559 typedef struct AVFormatContext {
560 const AVClass *av_class; /**< Set by avformat_alloc_context. */
561 /* Can only be iformat or oformat, not both at the same time. */
562 struct AVInputFormat *iformat;
563 struct AVOutputFormat *oformat;
564 void *priv_data;
565 ByteIOContext *pb;
566 unsigned int nb_streams;
567 AVStream *streams[MAX_STREAMS];
568 char filename[1024]; /**< input or output filename */
569 /* stream info */
570 int64_t timestamp;
571 char title[512];
572 char author[512];
573 char copyright[512];
574 char comment[512];
575 char album[512];
576 int year; /**< ID3 year, 0 if none */
577 int track; /**< track number, 0 if none */
578 char genre[32]; /**< ID3 genre */
579
580 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
581 /* private data for pts handling (do not modify directly). */
582 /** This buffer is only needed when packets were already buffered but
583 not decoded, for example to get the codec parameters in MPEG
584 streams. */
585 struct AVPacketList *packet_buffer;
586
587 /** Decoding: position of the first frame of the component, in
588 AV_TIME_BASE fractional seconds. NEVER set this value directly:
589 It is deduced from the AVStream values. */
590 int64_t start_time;
591 /** Decoding: duration of the stream, in AV_TIME_BASE fractional
592 seconds. NEVER set this value directly: it is deduced from the
593 AVStream values. */
594 int64_t duration;
595 /** decoding: total file size, 0 if unknown */
596 int64_t file_size;
597 /** Decoding: total stream bitrate in bit/s, 0 if not
598 available. Never set it directly if the file_size and the
599 duration are known as ffmpeg can compute it automatically. */
600 int bit_rate;
601
602 /* av_read_frame() support */
603 AVStream *cur_st;
604 #if LIBAVFORMAT_VERSION_INT < (53<<16)
605 const uint8_t *cur_ptr_deprecated;
606 int cur_len_deprecated;
607 AVPacket cur_pkt_deprecated;
608 #endif
609
610 /* av_seek_frame() support */
611 int64_t data_offset; /** offset of the first packet */
612 int index_built;
613
614 int mux_rate;
615 int packet_size;
616 int preload;
617 int max_delay;
618
619 #define AVFMT_NOOUTPUTLOOP -1
620 #define AVFMT_INFINITEOUTPUTLOOP 0
621 /** number of times to loop output in formats that support it */
622 int loop_output;
623
624 int flags;
625 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate pts if missing even if it requires parsing future frames.
626 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
627 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
628
629 int loop_input;
630 /** Decoding: size of data to probe; encoding: unused. */
631 unsigned int probesize;
632
633 /**
634 * Maximum time (in AV_TIME_BASE units) during which the input should
635 * be analyzed in av_find_stream_info().
636 */
637 int max_analyze_duration;
638
639 const uint8_t *key;
640 int keylen;
641
642 unsigned int nb_programs;
643 AVProgram **programs;
644
645 /**
646 * Forced video codec_id.
647 * Demuxing: Set by user.
648 */
649 enum CodecID video_codec_id;
650 /**
651 * Forced audio codec_id.
652 * Demuxing: Set by user.
653 */
654 enum CodecID audio_codec_id;
655 /**
656 * Forced subtitle codec_id.
657 * Demuxing: Set by user.
658 */
659 enum CodecID subtitle_codec_id;
660
661 /**
662 * Maximum amount of memory in bytes to use per stream for the index.
663 * If the needed index exceeds this size, entries will be discarded as
664 * needed to maintain a smaller size. This can lead to slower or less
665 * accurate seeking (depends on demuxer).
666 * Demuxers for which a full in-memory index is mandatory will ignore
667 * this.
668 * muxing : unused
669 * demuxing: set by user
670 */
671 unsigned int max_index_size;
672
673 /**
674 * Maximum amount of memory in bytes to use for buffering frames
675 * obtained from realtime capture devices.
676 */
677 unsigned int max_picture_buffer;
678
679 unsigned int nb_chapters;
680 AVChapter **chapters;
681
682 /**
683 * Flags to enable debugging.
684 */
685 int debug;
686 #define FF_FDEBUG_TS 0x0001
687
688 /**
689 * Raw packets from the demuxer, prior to parsing and decoding.
690 * This buffer is used for buffering packets until the codec can
691 * be identified, as parsing cannot be done without knowing the
692 * codec.
693 */
694 struct AVPacketList *raw_packet_buffer;
695 struct AVPacketList *raw_packet_buffer_end;
696
697 struct AVPacketList *packet_buffer_end;
698
699 AVMetadata *metadata;
700 } AVFormatContext;
701
702 typedef struct AVPacketList {
703 AVPacket pkt;
704 struct AVPacketList *next;
705 } AVPacketList;
706
707 #if LIBAVFORMAT_VERSION_INT < (53<<16)
708 extern AVInputFormat *first_iformat;
709 extern AVOutputFormat *first_oformat;
710 #endif
711
712 /**
713 * If f is NULL, returns the first registered input format,
714 * if f is non-NULL, returns the next registered input format after f,
715 * or NULL if f is the last one.
716 */
717 AVInputFormat *av_iformat_next(AVInputFormat *f);
718
719 /**
720 * If f is NULL, returns the first registered output format,
721 * if f is non-NULL, returns the next registered output format after f,
722 * or NULL if f is the last one.
723 */
724 AVOutputFormat *av_oformat_next(AVOutputFormat *f);
725
726 enum CodecID av_guess_image2_codec(const char *filename);
727
728 /* XXX: use automatic init with either ELF sections or C file parser */
729 /* modules */
730
731 /* utils.c */
732 void av_register_input_format(AVInputFormat *format);
733 void av_register_output_format(AVOutputFormat *format);
734 AVOutputFormat *guess_stream_format(const char *short_name,
735 const char *filename,
736 const char *mime_type);
737 AVOutputFormat *guess_format(const char *short_name,
738 const char *filename,
739 const char *mime_type);
740
741 /**
742 * Guesses the codec ID based upon muxer and filename.
743 */
744 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
745 const char *filename, const char *mime_type,
746 enum CodecType type);
747
748 /**
749 * Send a nice hexadecimal dump of a buffer to the specified file stream.
750 *
751 * @param f The file stream pointer where the dump should be sent to.
752 * @param buf buffer
753 * @param size buffer size
754 *
755 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log
756 */
757 void av_hex_dump(FILE *f, uint8_t *buf, int size);
758
759 /**
760 * Send a nice hexadecimal dump of a buffer to the log.
761 *
762 * @param avcl A pointer to an arbitrary struct of which the first field is a
763 * pointer to an AVClass struct.
764 * @param level The importance level of the message, lower values signifying
765 * higher importance.
766 * @param buf buffer
767 * @param size buffer size
768 *
769 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log
770 */
771 void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size);
772
773 /**
774 * Send a nice dump of a packet to the specified file stream.
775 *
776 * @param f The file stream pointer where the dump should be sent to.
777 * @param pkt packet to dump
778 * @param dump_payload True if the payload must be displayed, too.
779 */
780 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
781
782 /**
783 * Send a nice dump of a packet to the log.
784 *
785 * @param avcl A pointer to an arbitrary struct of which the first field is a
786 * pointer to an AVClass struct.
787 * @param level The importance level of the message, lower values signifying
788 * higher importance.
789 * @param pkt packet to dump
790 * @param dump_payload True if the payload must be displayed, too.
791 */
792 void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload);
793
794 /**
795 * Initialize libavformat and register all the muxers, demuxers and
796 * protocols. If you do not call this function, then you can select
797 * exactly which formats you want to support.
798 *
799 * @see av_register_input_format()
800 * @see av_register_output_format()
801 * @see av_register_protocol()
802 */
803 void av_register_all(void);
804
805 /** codec tag <-> codec id */
806 enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
807 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecID id);
808
809 /* media file input */
810
811 /**
812 * Finds AVInputFormat based on the short name of the input format.
813 */
814 AVInputFormat *av_find_input_format(const char *short_name);
815
816 /**
817 * Guess file format.
818 *
819 * @param is_opened Whether the file is already opened; determines whether
820 * demuxers with or without AVFMT_NOFILE are probed.
821 */
822 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
823
824 /**
825 * Allocates all the structures needed to read an input stream.
826 * This does not open the needed codecs for decoding the stream[s].
827 */
828 int av_open_input_stream(AVFormatContext **ic_ptr,
829 ByteIOContext *pb, const char *filename,
830 AVInputFormat *fmt, AVFormatParameters *ap);
831
832 /**
833 * Open a media file as input. The codecs are not opened. Only the file
834 * header (if present) is read.
835 *
836 * @param ic_ptr The opened media file handle is put here.
837 * @param filename filename to open
838 * @param fmt If non-NULL, force the file format to use.
839 * @param buf_size optional buffer size (zero if default is OK)
840 * @param ap Additional parameters needed when opening the file
841 * (NULL if default).
842 * @return 0 if OK, AVERROR_xxx otherwise
843 */
844 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
845 AVInputFormat *fmt,
846 int buf_size,
847 AVFormatParameters *ap);
848
849 #if LIBAVFORMAT_VERSION_MAJOR < 53
850 /**
851 * @deprecated Use avformat_alloc_context() instead.
852 */
853 attribute_deprecated AVFormatContext *av_alloc_format_context(void);
854 #endif
855
856 /**
857 * Allocate an AVFormatContext.
858 * Can be freed with av_free() but do not forget to free everything you
859 * explicitly allocated as well!
860 */
861 AVFormatContext *avformat_alloc_context(void);
862
863 /**
864 * Read packets of a media file to get stream information. This
865 * is useful for file formats with no headers such as MPEG. This
866 * function also computes the real frame rate in case of MPEG-2 repeat
867 * frame mode.
868 * The logical file position is not changed by this function;
869 * examined packets may be buffered for later processing.
870 *
871 * @param ic media file handle
872 * @return >=0 if OK, AVERROR_xxx on error
873 * @todo Let the user decide somehow what information is needed so that
874 * we do not waste time getting stuff the user does not need.
875 */
876 int av_find_stream_info(AVFormatContext *ic);
877
878 /**
879 * Read a transport packet from a media file.
880 *
881 * This function is obsolete and should never be used.
882 * Use av_read_frame() instead.
883 *
884 * @param s media file handle
885 * @param pkt is filled
886 * @return 0 if OK, AVERROR_xxx on error
887 */
888 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
889
890 /**
891 * Return the next frame of a stream.
892 *
893 * The returned packet is valid
894 * until the next av_read_frame() or until av_close_input_file() and
895 * must be freed with av_free_packet. For video, the packet contains
896 * exactly one frame. For audio, it contains an integer number of
897 * frames if each frame has a known fixed size (e.g. PCM or ADPCM
898 * data). If the audio frames have a variable size (e.g. MPEG audio),
899 * then it contains one frame.
900 *
901 * pkt->pts, pkt->dts and pkt->duration are always set to correct
902 * values in AVStream.timebase units (and guessed if the format cannot
903 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
904 * has B-frames, so it is better to rely on pkt->dts if you do not
905 * decompress the payload.
906 *
907 * @return 0 if OK, < 0 on error or end of file
908 */
909 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
910
911 /**
912 * Seek to the key frame at timestamp.
913 * 'timestamp' in 'stream_index'.
914 * @param stream_index If stream_index is (-1), a default
915 * stream is selected, and timestamp is automatically converted
916 * from AV_TIME_BASE units to the stream specific time_base.
917 * @param timestamp Timestamp in AVStream.time_base units
918 * or, if no stream is specified, in AV_TIME_BASE units.
919 * @param flags flags which select direction and seeking mode
920 * @return >= 0 on success
921 */
922 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
923 int flags);
924
925 /**
926 * Seek to timestamp ts.
927 * Seeking will be done so that the point from which all active streams
928 * can be presented successfully will be closest to ts and within min/max_ts.
929 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
930 *
931 * if flags contain AVSEEK_FLAG_BYTE then all timestamps are in byte and
932 * are the file position (this may not be supported by all demuxers).
933 * if flags contain AVSEEK_FLAG_FRAME then all timestamps are in frames
934 * in the stream with stream_index (this may not be supported by all demuxers).
935 * else all timestamps are in units of the stream selected by stream_index or
936 * if stream_index is -1, AV_TIME_BASE units.
937 * if flags contain AVSEEK_FLAG_ANY then non keyframes are treated as
938 * keyframes (this may not be supported by all demuxers).
939 *
940 * @param stream_index index of the stream which is used as timebase reference.
941 * @param min_ts smallest acceptable timestamp
942 * @param ts target timestamp
943 * @param max_ts largest acceptable timestamp
944 * @param flags flags
945 * @returns >=0 on success, error code otherwise
946 *
947 * @NOTE this is part of the new seek API which is still under construction
948 * thus do not use this yet it may change any time, dont expect ABI
949 * compatibility yet!
950 */
951 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
952
953 /**
954 * Start playing a network based stream (e.g. RTSP stream) at the
955 * current position.
956 */
957 int av_read_play(AVFormatContext *s);
958
959 /**
960 * Pause a network based stream (e.g. RTSP stream).
961 *
962 * Use av_read_play() to resume it.
963 */
964 int av_read_pause(AVFormatContext *s);
965
966 /**
967 * Free a AVFormatContext allocated by av_open_input_stream.
968 * @param s context to free
969 */
970 void av_close_input_stream(AVFormatContext *s);
971
972 /**
973 * Close a media file (but not its codecs).
974 *
975 * @param s media file handle
976 */
977 void av_close_input_file(AVFormatContext *s);
978
979 /**
980 * Add a new stream to a media file.
981 *
982 * Can only be called in the read_header() function. If the flag
983 * AVFMTCTX_NOHEADER is in the format context, then new streams
984 * can be added in read_packet too.
985 *
986 * @param s media file handle
987 * @param id file-format-dependent stream ID
988 */
989 AVStream *av_new_stream(AVFormatContext *s, int id);
990 AVProgram *av_new_program(AVFormatContext *s, int id);
991
992 /**
993 * Add a new chapter.
994 * This function is NOT part of the public API
995 * and should ONLY be used by demuxers.
996 *
997 * @param s media file handle
998 * @param id unique ID for this chapter
999 * @param start chapter start time in time_base units
1000 * @param end chapter end time in time_base units
1001 * @param title chapter title
1002 *
1003 * @return AVChapter or NULL on error
1004 */
1005 AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base,
1006 int64_t start, int64_t end, const char *title);
1007
1008 /**
1009 * Set the pts for a given stream.
1010 *
1011 * @param s stream
1012 * @param pts_wrap_bits number of bits effectively used by the pts
1013 * (used for wrap control, 33 is the value for MPEG)
1014 * @param pts_num numerator to convert to seconds (MPEG: 1)
1015 * @param pts_den denominator to convert to seconds (MPEG: 90000)
1016 */
1017 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
1018 int pts_num, int pts_den);
1019
1020 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
1021 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
1022 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
1023
1024 int av_find_default_stream_index(AVFormatContext *s);
1025
1026 /**
1027 * Gets the index for a specific timestamp.
1028 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
1029 * to the timestamp which is <= the requested one, if backward
1030 * is 0, then it will be >=
1031 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
1032 * @return < 0 if no such timestamp could be found
1033 */
1034 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
1035
1036 /**
1037 * Ensures the index uses less memory than the maximum specified in
1038 * AVFormatContext.max_index_size, by discarding entries if it grows
1039 * too large.
1040 * This function is not part of the public API and should only be called
1041 * by demuxers.
1042 */
1043 void ff_reduce_index(AVFormatContext *s, int stream_index);
1044
1045 /**
1046 * Add an index entry into a sorted list. Update the entry if the list
1047 * already contains it.
1048 *
1049 * @param timestamp timestamp in the time base of the given stream
1050 */
1051 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
1052 int size, int distance, int flags);
1053
1054 /**
1055 * Does a binary search using av_index_search_timestamp() and
1056 * AVCodec.read_timestamp().
1057 * This is not supposed to be called directly by a user application,
1058 * but by demuxers.
1059 * @param target_ts target timestamp in the time base of the given stream
1060 * @param stream_index stream number
1061 */
1062 int av_seek_frame_binary(AVFormatContext *s, int stream_index,
1063 int64_t target_ts, int flags);
1064
1065 /**
1066 * Updates cur_dts of all streams based on the given timestamp and AVStream.
1067 *
1068 * Stream ref_st unchanged, others set cur_dts in their native time base.
1069 * Only needed for timestamp wrapping or if (dts not set and pts!=dts).
1070 * @param timestamp new dts expressed in time_base of param ref_st
1071 * @param ref_st reference stream giving time_base of param timestamp
1072 */
1073 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
1074
1075 /**
1076 * Does a binary search using read_timestamp().
1077 * This is not supposed to be called directly by a user application,
1078 * but by demuxers.
1079 * @param target_ts target timestamp in the time base of the given stream
1080 * @param stream_index stream number
1081 */
1082 int64_t av_gen_search(AVFormatContext *s, int stream_index,
1083 int64_t target_ts, int64_t pos_min,
1084 int64_t pos_max, int64_t pos_limit,
1085 int64_t ts_min, int64_t ts_max,
1086 int flags, int64_t *ts_ret,
1087 int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
1088
1089 /** media file output */
1090 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
1091
1092 /**
1093 * Allocate the stream private data and write the stream header to an
1094 * output media file.
1095 *
1096 * @param s media file handle
1097 * @return 0 if OK, AVERROR_xxx on error
1098 */
1099 int av_write_header(AVFormatContext *s);
1100
1101 /**
1102 * Write a packet to an output media file.
1103 *
1104 * The packet shall contain one audio or video frame.
1105 * The packet must be correctly interleaved according to the container
1106 * specification, if not then av_interleaved_write_frame must be used.
1107 *
1108 * @param s media file handle
1109 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1110 dts/pts, ...
1111 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1112 */
1113 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
1114
1115 /**
1116 * Writes a packet to an output media file ensuring correct interleaving.
1117 *
1118 * The packet must contain one audio or video frame.
1119 * If the packets are already correctly interleaved the application should
1120 * call av_write_frame() instead as it is slightly faster. It is also important
1121 * to keep in mind that completely non-interleaved input will need huge amounts
1122 * of memory to interleave with this, so it is preferable to interleave at the
1123 * demuxer level.
1124 *
1125 * @param s media file handle
1126 * @param pkt The packet, which contains the stream_index, buf/buf_size,
1127 dts/pts, ...
1128 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted
1129 */
1130 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
1131
1132 /**
1133 * Interleave a packet per dts in an output media file.
1134 *
1135 * Packets with pkt->destruct == av_destruct_packet will be freed inside this
1136 * function, so they cannot be used after it, note calling av_free_packet()
1137 * on them is still safe.
1138 *
1139 * @param s media file handle
1140 * @param out the interleaved packet will be output here
1141 * @param in the input packet
1142 * @param flush 1 if no further packets are available as input and all
1143 * remaining packets should be output
1144 * @return 1 if a packet was output, 0 if no packet could be output,
1145 * < 0 if an error occurred
1146 */
1147 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out,
1148 AVPacket *pkt, int flush);
1149
1150 /**
1151 * @brief Write the stream trailer to an output media file and
1152 * free the file private data.
1153 *
1154 * May only be called after a successful call to av_write_header.
1155 *
1156 * @param s media file handle
1157 * @return 0 if OK, AVERROR_xxx on error
1158 */
1159 int av_write_trailer(AVFormatContext *s);
1160
1161 void dump_format(AVFormatContext *ic,
1162 int index,
1163 const char *url,
1164 int is_output);
1165
1166 #if LIBAVFORMAT_VERSION_MAJOR < 53
1167 /**
1168 * Parses width and height out of string str.
1169 * @deprecated Use av_parse_video_frame_size instead.
1170 */
1171 attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr,
1172 const char *str);
1173
1174 /**
1175 * Converts frame rate from string to a fraction.
1176 * @deprecated Use av_parse_video_frame_rate instead.
1177 */
1178 attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base,
1179 const char *arg);
1180 #endif
1181
1182 /**
1183 * Parses \p datestr and returns a corresponding number of microseconds.
1184 * @param datestr String representing a date or a duration.
1185 * - If a date the syntax is:
1186 * @code
1187 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
1188 * @endcode
1189 * Time is local time unless Z is appended, in which case it is
1190 * interpreted as UTC.
1191 * If the year-month-day part is not specified it takes the current
1192 * year-month-day.
1193 * Returns the number of microseconds since 1st of January, 1970 up to
1194 * the time of the parsed date or INT64_MIN if \p datestr cannot be
1195 * successfully parsed.
1196 * - If a duration the syntax is:
1197 * @code
1198 * [-]HH[:MM[:SS[.m...]]]
1199 * [-]S+[.m...]
1200 * @endcode
1201 * Returns the number of microseconds contained in a time interval
1202 * with the specified duration or INT64_MIN if \p datestr cannot be
1203 * successfully parsed.
1204 * @param duration Flag which tells how to interpret \p datestr, if
1205 * not zero \p datestr is interpreted as a duration, otherwise as a
1206 * date.
1207 */
1208 int64_t parse_date(const char *datestr, int duration);
1209
1210 /** Gets the current time in microseconds. */
1211 int64_t av_gettime(void);
1212
1213 /* ffm-specific for ffserver */
1214 #define FFM_PACKET_SIZE 4096
1215 int64_t ffm_read_write_index(int fd);
1216 int ffm_write_write_index(int fd, int64_t pos);
1217 void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
1218
1219 /**
1220 * Attempts to find a specific tag in a URL.
1221 *
1222 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
1223 * Return 1 if found.
1224 */
1225 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
1226
1227 /**
1228 * Returns in 'buf' the path with '%d' replaced by number.
1229 *
1230 * Also handles the '%0nd' format where 'n' is the total number
1231 * of digits and '%%'.
1232 *
1233 * @param buf destination buffer
1234 * @param buf_size destination buffer size
1235 * @param path numbered sequence string
1236 * @param number frame number
1237 * @return 0 if OK, -1 on format error
1238 */
1239 int av_get_frame_filename(char *buf, int buf_size,
1240 const char *path, int number);
1241
1242 /**
1243 * Check whether filename actually is a numbered sequence generator.
1244 *
1245 * @param filename possible numbered sequence string
1246 * @return 1 if a valid numbered sequence string, 0 otherwise
1247 */
1248 int av_filename_number_test(const char *filename);
1249
1250 /**
1251 * Generate an SDP for an RTP session.
1252 *
1253 * @param ac array of AVFormatContexts describing the RTP streams. If the
1254 * array is composed by only one context, such context can contain
1255 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
1256 * all the contexts in the array (an AVCodecContext per RTP stream)
1257 * must contain only one AVStream.
1258 * @param n_files number of AVCodecContexts contained in ac
1259 * @param buff buffer where the SDP will be stored (must be allocated by
1260 * the caller)
1261 * @param size the size of the buffer
1262 * @return 0 if OK, AVERROR_xxx on error
1263 */
1264 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size);
1265
1266 #ifdef HAVE_AV_CONFIG_H
1267
1268 void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem);
1269
1270 #ifdef __GNUC__
1271 #define dynarray_add(tab, nb_ptr, elem)\
1272 do {\
1273 __typeof__(tab) _tab = (tab);\
1274 __typeof__(elem) _elem = (elem);\
1275 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
1276 ff_dynarray_add((intptr_t **)_tab, nb_ptr, (intptr_t)_elem);\
1277 } while(0)
1278 #else
1279 #define dynarray_add(tab, nb_ptr, elem)\
1280 do {\
1281 ff_dynarray_add((intptr_t **)(tab), nb_ptr, (intptr_t)(elem));\
1282 } while(0)
1283 #endif
1284
1285 time_t mktimegm(struct tm *tm);
1286 struct tm *brktimegm(time_t secs, struct tm *tm);
1287 const char *small_strptime(const char *p, const char *fmt,
1288 struct tm *dt);
1289
1290 struct in_addr;
1291 int resolve_host(struct in_addr *sin_addr, const char *hostname);
1292
1293 void url_split(char *proto, int proto_size,
1294 char *authorization, int authorization_size,
1295 char *hostname, int hostname_size,
1296 int *port_ptr,
1297 char *path, int path_size,
1298 const char *url);
1299
1300 int match_ext(const char *filename, const char *extensions);
1301
1302 #endif /* HAVE_AV_CONFIG_H */
1303
1304 #endif /* AVFORMAT_AVFORMAT_H */