2 * copyright (c) 2001 Fabrice Bellard
4 * This file is part of FFmpeg.
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.
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.
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
28 #define LIBAVFORMAT_VERSION_INT ((51<<16)+(10<<8)+0)
29 #define LIBAVFORMAT_VERSION 51.10.0
30 #define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
32 #define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
35 #include <stdio.h> /* FILE */
40 /* packet functions */
42 typedef struct AVPacket {
43 int64_t pts; ///< presentation time stamp in time_base units
44 int64_t dts; ///< decompression time stamp in time_base units
49 int duration; ///< presentation duration in time_base units (0 if not available)
50 void (*destruct)(struct AVPacket *);
52 int64_t pos; ///< byte position in stream, -1 if unknown
54 #define PKT_FLAG_KEY 0x0001
56 void av_destruct_packet_nofree(AVPacket *pkt);
57 void av_destruct_packet(AVPacket *pkt);
59 /* initialize optional fields of a packet */
60 static inline void av_init_packet(AVPacket *pkt)
62 pkt->pts = AV_NOPTS_VALUE;
63 pkt->dts = AV_NOPTS_VALUE;
67 pkt->stream_index = 0;
68 pkt->destruct= av_destruct_packet_nofree;
71 int av_new_packet(AVPacket *pkt, int size);
72 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size);
73 int av_dup_packet(AVPacket *pkt);
78 * @param pkt packet to free
80 static inline void av_free_packet(AVPacket *pkt)
82 if (pkt && pkt->destruct) {
87 /*************************************************/
88 /* fractional numbers for exact pts handling */
90 /* the exact value of the fractional number is: 'val + num / den'. num
91 is assumed to be such as 0 <= num < den */
92 typedef struct AVFrac {
93 int64_t val, num, den;
94 } AVFrac attribute_deprecated;
96 /*************************************************/
97 /* input/output formats */
101 struct AVFormatContext;
103 /* this structure contains the data a format has to probe a file */
104 typedef struct AVProbeData {
105 const char *filename;
110 #define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
112 typedef struct AVFormatParameters {
113 AVRational time_base;
118 enum PixelFormat pix_fmt;
119 int channel; /* used to select dv channel */
120 const char *device; /* video, audio or DV device */
121 const char *standard; /* tv standard, NTSC, PAL, SECAM */
122 int mpeg2ts_raw:1; /* force raw MPEG2 transport stream output, if possible */
123 int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
124 stream packet (only meaningful if
125 mpeg2ts_raw is TRUE */
126 int initial_pause:1; /* do not begin to play the stream
127 immediately (RTSP only) */
128 int prealloced_context:1;
129 enum CodecID video_codec_id;
130 enum CodecID audio_codec_id;
131 } AVFormatParameters;
133 //! demuxer will use url_fopen, no opened file should be provided by the caller
134 #define AVFMT_NOFILE 0x0001
135 #define AVFMT_NEEDNUMBER 0x0002 /* needs '%d' in filename */
136 #define AVFMT_SHOW_IDS 0x0008 /* show format stream IDs numbers */
137 #define AVFMT_RAWPICTURE 0x0020 /* format wants AVPicture structure for
139 #define AVFMT_GLOBALHEADER 0x0040 /* format wants global header */
140 #define AVFMT_NOTIMESTAMPS 0x0080 /* format doesnt need / has any timestamps */
141 #define AVFMT_GENERIC_INDEX 0x0100 /* use generic index building code */
143 typedef struct AVOutputFormat {
145 const char *long_name;
146 const char *mime_type;
147 const char *extensions; /* comma separated extensions */
148 /* size of private data so that it can be allocated in the wrapper */
151 enum CodecID audio_codec; /* default audio codec */
152 enum CodecID video_codec; /* default video codec */
153 int (*write_header)(struct AVFormatContext *);
154 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
155 int (*write_trailer)(struct AVFormatContext *);
156 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
158 /* currently only used to set pixel format if not YUV420P */
159 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
160 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
163 * list of supported codec_id-codec_tag pairs, ordered by "better choice first"
164 * the arrays are all CODEC_ID_NONE terminated
166 const struct AVCodecTag **codec_tag;
169 struct AVOutputFormat *next;
172 typedef struct AVInputFormat {
174 const char *long_name;
175 /* size of private data so that it can be allocated in the wrapper */
177 /* tell if a given file has a chance of being parsing by this format */
178 int (*read_probe)(AVProbeData *);
179 /* read the format header and initialize the AVFormatContext
180 structure. Return 0 if OK. 'ap' if non NULL contains
181 additionnal paramters. Only used in raw format right
182 now. 'av_new_stream' should be called to create new streams. */
183 int (*read_header)(struct AVFormatContext *,
184 AVFormatParameters *ap);
185 /* read one packet and put it in 'pkt'. pts and flags are also
186 set. 'av_new_stream' can be called only if the flag
187 AVFMTCTX_NOHEADER is used. */
188 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
189 /* close the stream. The AVFormatContext and AVStreams are not
190 freed by this function */
191 int (*read_close)(struct AVFormatContext *);
193 * seek to a given timestamp relative to the frames in
194 * stream component stream_index
195 * @param stream_index must not be -1
196 * @param flags selects which direction should be preferred if no exact
199 int (*read_seek)(struct AVFormatContext *,
200 int stream_index, int64_t timestamp, int flags);
202 * gets the next timestamp in AV_TIME_BASE units.
204 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
205 int64_t *pos, int64_t pos_limit);
206 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
208 /* if extensions are defined, then no probe is done. You should
209 usually not use extension format guessing because it is not
211 const char *extensions;
212 /* general purpose read only value that the format can use */
215 /* start/resume playing - only meaningful if using a network based format
217 int (*read_play)(struct AVFormatContext *);
219 /* pause playing - only meaningful if using a network based format
221 int (*read_pause)(struct AVFormatContext *);
223 const struct AVCodecTag **codec_tag;
226 struct AVInputFormat *next;
229 typedef struct AVIndexEntry {
232 #define AVINDEX_KEYFRAME 0x0001
234 int size:30; //yeah trying to keep the size of this small to reduce memory requirements (its 24 vs 32 byte due to possible 8byte align)
235 int min_distance; /* min distance between this and the previous keyframe, used to avoid unneeded searching */
238 typedef struct AVStream {
239 int index; /* stream index in AVFormatContext */
240 int id; /* format specific stream id */
241 AVCodecContext *codec; /* codec context */
243 * real base frame rate of the stream.
244 * this is the lowest framerate with which all timestamps can be
245 * represented accurately (its the least common multiple of all
246 * framerates in the stream), Note, this value is just a guess!
247 * for example if the timebase is 1/90000 and all frames have either
248 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
250 AVRational r_frame_rate;
252 /* internal data used in av_find_stream_info() */
253 int64_t codec_info_duration;
254 int codec_info_nb_frames;
255 /* encoding: PTS generation when outputing stream */
259 * this is the fundamental unit of time (in seconds) in terms
260 * of which frame timestamps are represented. for fixed-fps content,
261 * timebase should be 1/framerate and timestamp increments should be
264 AVRational time_base;
265 int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
266 /* ffmpeg.c private use */
267 int stream_copy; /* if TRUE, just copy stream */
268 enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
269 //FIXME move stuff to a flags field?
270 /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
271 * MN:dunno if thats the right place, for it */
273 /* decoding: position of the first frame of the component, in
274 AV_TIME_BASE fractional seconds. */
276 /* decoding: duration of the stream, in AV_TIME_BASE fractional
280 char language[4]; /* ISO 639 3-letter language code (empty string if undefined) */
282 /* av_read_frame() support */
283 int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack
284 struct AVCodecParserContext *parser;
287 int last_IP_duration;
289 /* av_seek_frame() support */
290 AVIndexEntry *index_entries; /* only used if the format does not
291 support seeking natively */
292 int nb_index_entries;
293 unsigned int index_entries_allocated_size;
295 int64_t nb_frames; ///< number of frames in this stream if known or 0
297 #define MAX_REORDER_DELAY 4
298 int64_t pts_buffer[MAX_REORDER_DELAY+1];
301 #define AVFMTCTX_NOHEADER 0x0001 /* signal that no header is present
302 (streams are added dynamically) */
304 #define MAX_STREAMS 20
306 /* format I/O context */
307 typedef struct AVFormatContext {
308 const AVClass *av_class; /* set by av_alloc_format_context */
309 /* can only be iformat or oformat, not both at the same time */
310 struct AVInputFormat *iformat;
311 struct AVOutputFormat *oformat;
314 unsigned int nb_streams;
315 AVStream *streams[MAX_STREAMS];
316 char filename[1024]; /* input or output filename */
324 int year; /* ID3 year, 0 if none */
325 int track; /* track number, 0 if none */
326 char genre[32]; /* ID3 genre */
328 int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
329 /* private data for pts handling (do not modify directly) */
330 /* This buffer is only needed when packets were already buffered but
331 not decoded, for example to get the codec parameters in mpeg
333 struct AVPacketList *packet_buffer;
335 /* decoding: position of the first frame of the component, in
336 AV_TIME_BASE fractional seconds. NEVER set this value directly:
337 it is deduced from the AVStream values. */
339 /* decoding: duration of the stream, in AV_TIME_BASE fractional
340 seconds. NEVER set this value directly: it is deduced from the
343 /* decoding: total file size. 0 if unknown */
345 /* decoding: total stream bitrate in bit/s, 0 if not
346 available. Never set it directly if the file_size and the
347 duration are known as ffmpeg can compute it automatically. */
350 /* av_read_frame() support */
352 const uint8_t *cur_ptr;
356 /* av_seek_frame() support */
357 int64_t data_offset; /* offset of the first packet */
365 #define AVFMT_NOOUTPUTLOOP -1
366 #define AVFMT_INFINITEOUTPUTLOOP 0
367 /* number of times to loop output in formats that support it */
371 #define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
372 #define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
375 /* decoding: size of data to probe; encoding unused */
376 unsigned int probesize;
379 * maximum duration in AV_TIME_BASE units over which the input should be analyzed in av_find_stream_info()
381 int max_analyze_duration;
387 typedef struct AVPacketList {
389 struct AVPacketList *next;
392 extern AVInputFormat *first_iformat;
393 extern AVOutputFormat *first_oformat;
395 enum CodecID av_guess_image2_codec(const char *filename);
397 /* XXX: use automatic init with either ELF sections or C file parser */
405 void av_register_input_format(AVInputFormat *format);
406 void av_register_output_format(AVOutputFormat *format);
407 AVOutputFormat *guess_stream_format(const char *short_name,
408 const char *filename, const char *mime_type);
409 AVOutputFormat *guess_format(const char *short_name,
410 const char *filename, const char *mime_type);
411 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
412 const char *filename, const char *mime_type, enum CodecType type);
414 void av_hex_dump(FILE *f, uint8_t *buf, int size);
415 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
417 void av_register_all(void);
419 /* codec tag <-> codec id */
420 enum CodecID av_codec_get_id(const struct AVCodecTag **tags, unsigned int tag);
421 unsigned int av_codec_get_tag(const struct AVCodecTag **tags, enum CodecID id);
423 /* media file input */
424 AVInputFormat *av_find_input_format(const char *short_name);
425 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
426 int av_open_input_stream(AVFormatContext **ic_ptr,
427 ByteIOContext *pb, const char *filename,
428 AVInputFormat *fmt, AVFormatParameters *ap);
429 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
432 AVFormatParameters *ap);
433 /* no av_open for output, so applications will need this: */
434 AVFormatContext *av_alloc_format_context(void);
436 int av_find_stream_info(AVFormatContext *ic);
437 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
438 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
439 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
440 int av_read_play(AVFormatContext *s);
441 int av_read_pause(AVFormatContext *s);
442 void av_close_input_file(AVFormatContext *s);
443 AVStream *av_new_stream(AVFormatContext *s, int id);
444 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
445 int pts_num, int pts_den);
447 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
448 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
449 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
451 int av_find_default_stream_index(AVFormatContext *s);
452 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
453 int av_add_index_entry(AVStream *st,
454 int64_t pos, int64_t timestamp, int size, int distance, int flags);
455 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
456 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
457 int64_t av_gen_search(AVFormatContext *s, int stream_index, int64_t target_ts, int64_t pos_min, int64_t pos_max, int64_t pos_limit, int64_t ts_min, int64_t ts_max, int flags, int64_t *ts_ret, int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t ));
459 /* media file output */
460 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
461 int av_write_header(AVFormatContext *s);
462 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
463 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
464 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
466 int av_write_trailer(AVFormatContext *s);
468 void dump_format(AVFormatContext *ic,
472 int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
473 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
474 int64_t parse_date(const char *datestr, int duration);
476 int64_t av_gettime(void);
478 /* ffm specific for ffserver */
479 #define FFM_PACKET_SIZE 4096
480 offset_t ffm_read_write_index(int fd);
481 void ffm_write_write_index(int fd, offset_t pos);
482 void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
484 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
486 int av_get_frame_filename(char *buf, int buf_size,
487 const char *path, int number);
488 int av_filename_number_test(const char *filename);
491 int video_grab_init(void);
492 int audio_init(void);
495 int dv1394_init(void);
496 int dc1394_init(void);
498 #ifdef HAVE_AV_CONFIG_H
500 #include "os_support.h"
502 int strstart(const char *str, const char *val, const char **ptr);
503 int stristart(const char *str, const char *val, const char **ptr);
504 void pstrcpy(char *buf, int buf_size, const char *str);
505 char *pstrcat(char *buf, int buf_size, const char *s);
507 void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
510 #define dynarray_add(tab, nb_ptr, elem)\
512 typeof(tab) _tab = (tab);\
513 typeof(elem) _elem = (elem);\
514 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
515 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
518 #define dynarray_add(tab, nb_ptr, elem)\
520 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
524 time_t mktimegm(struct tm *tm);
525 struct tm *brktimegm(time_t secs, struct tm *tm);
526 const char *small_strptime(const char *p, const char *fmt,
530 int resolve_host(struct in_addr *sin_addr, const char *hostname);
532 void url_split(char *proto, int proto_size,
533 char *authorization, int authorization_size,
534 char *hostname, int hostname_size,
536 char *path, int path_size,
539 int match_ext(const char *filename, const char *extensions);
541 #endif /* HAVE_AV_CONFIG_H */
547 #endif /* AVFORMAT_H */