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)+(7<<8)+0)
29 #define LIBAVFORMAT_VERSION 51.7.0
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 */
99 struct AVFormatContext;
101 /* this structure contains the data a format has to probe a file */
102 typedef struct AVProbeData {
103 const char *filename;
108 #define AVPROBE_SCORE_MAX 100 ///< max score, half of that is used for file extension based detection
110 typedef struct AVFormatParameters {
111 AVRational time_base;
116 enum PixelFormat pix_fmt;
117 int channel; /* used to select dv channel */
118 const char *device; /* video, audio or DV device */
119 const char *standard; /* tv standard, NTSC, PAL, SECAM */
120 int mpeg2ts_raw:1; /* force raw MPEG2 transport stream output, if possible */
121 int mpeg2ts_compute_pcr:1; /* compute exact PCR for each transport
122 stream packet (only meaningful if
123 mpeg2ts_raw is TRUE */
124 int initial_pause:1; /* do not begin to play the stream
125 immediately (RTSP only) */
126 int prealloced_context:1;
127 enum CodecID video_codec_id;
128 enum CodecID audio_codec_id;
129 } AVFormatParameters;
131 //! demuxer will use url_fopen, no opened file should be provided by the caller
132 #define AVFMT_NOFILE 0x0001
133 #define AVFMT_NEEDNUMBER 0x0002 /* needs '%d' in filename */
134 #define AVFMT_SHOW_IDS 0x0008 /* show format stream IDs numbers */
135 #define AVFMT_RAWPICTURE 0x0020 /* format wants AVPicture structure for
137 #define AVFMT_GLOBALHEADER 0x0040 /* format wants global header */
138 #define AVFMT_NOTIMESTAMPS 0x0080 /* format doesnt need / has any timestamps */
140 typedef struct AVOutputFormat {
142 const char *long_name;
143 const char *mime_type;
144 const char *extensions; /* comma separated extensions */
145 /* size of private data so that it can be allocated in the wrapper */
148 enum CodecID audio_codec; /* default audio codec */
149 enum CodecID video_codec; /* default video codec */
150 int (*write_header)(struct AVFormatContext *);
151 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
152 int (*write_trailer)(struct AVFormatContext *);
153 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */
155 /* currently only used to set pixel format if not YUV420P */
156 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *);
157 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, AVPacket *in, int flush);
159 struct AVOutputFormat *next;
162 typedef struct AVInputFormat {
164 const char *long_name;
165 /* size of private data so that it can be allocated in the wrapper */
167 /* tell if a given file has a chance of being parsing by this format */
168 int (*read_probe)(AVProbeData *);
169 /* read the format header and initialize the AVFormatContext
170 structure. Return 0 if OK. 'ap' if non NULL contains
171 additionnal paramters. Only used in raw format right
172 now. 'av_new_stream' should be called to create new streams. */
173 int (*read_header)(struct AVFormatContext *,
174 AVFormatParameters *ap);
175 /* read one packet and put it in 'pkt'. pts and flags are also
176 set. 'av_new_stream' can be called only if the flag
177 AVFMTCTX_NOHEADER is used. */
178 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
179 /* close the stream. The AVFormatContext and AVStreams are not
180 freed by this function */
181 int (*read_close)(struct AVFormatContext *);
183 * seek to a given timestamp relative to the frames in
184 * stream component stream_index
185 * @param stream_index must not be -1
186 * @param flags selects which direction should be preferred if no exact
189 int (*read_seek)(struct AVFormatContext *,
190 int stream_index, int64_t timestamp, int flags);
192 * gets the next timestamp in AV_TIME_BASE units.
194 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
195 int64_t *pos, int64_t pos_limit);
196 /* can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER */
198 /* if extensions are defined, then no probe is done. You should
199 usually not use extension format guessing because it is not
201 const char *extensions;
202 /* general purpose read only value that the format can use */
205 /* start/resume playing - only meaningful if using a network based format
207 int (*read_play)(struct AVFormatContext *);
209 /* pause playing - only meaningful if using a network based format
211 int (*read_pause)(struct AVFormatContext *);
214 struct AVInputFormat *next;
217 typedef struct AVIndexEntry {
220 #define AVINDEX_KEYFRAME 0x0001
222 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)
223 int min_distance; /* min distance between this and the previous keyframe, used to avoid unneeded searching */
226 typedef struct AVStream {
227 int index; /* stream index in AVFormatContext */
228 int id; /* format specific stream id */
229 AVCodecContext *codec; /* codec context */
231 * real base frame rate of the stream.
232 * this is the lowest framerate with which all timestamps can be
233 * represented accurately (its the least common multiple of all
234 * framerates in the stream), Note, this value is just a guess!
235 * for example if the timebase is 1/90000 and all frames have either
236 * approximately 3600 or 1800 timer ticks then r_frame_rate will be 50/1
238 AVRational r_frame_rate;
240 /* internal data used in av_find_stream_info() */
241 int64_t codec_info_duration;
242 int codec_info_nb_frames;
243 /* encoding: PTS generation when outputing stream */
247 * this is the fundamental unit of time (in seconds) in terms
248 * of which frame timestamps are represented. for fixed-fps content,
249 * timebase should be 1/framerate and timestamp increments should be
252 AVRational time_base;
253 int pts_wrap_bits; /* number of bits in pts (used for wrapping control) */
254 /* ffmpeg.c private use */
255 int stream_copy; /* if TRUE, just copy stream */
256 enum AVDiscard discard; ///< selects which packets can be discarded at will and dont need to be demuxed
257 //FIXME move stuff to a flags field?
258 /* quality, as it has been removed from AVCodecContext and put in AVVideoFrame
259 * MN:dunno if thats the right place, for it */
261 /* decoding: position of the first frame of the component, in
262 AV_TIME_BASE fractional seconds. */
264 /* decoding: duration of the stream, in AV_TIME_BASE fractional
268 char language[4]; /* ISO 639 3-letter language code (empty string if undefined) */
270 /* av_read_frame() support */
271 int need_parsing; ///< 1->full parsing needed, 2->only parse headers dont repack
272 struct AVCodecParserContext *parser;
275 int last_IP_duration;
277 /* av_seek_frame() support */
278 AVIndexEntry *index_entries; /* only used if the format does not
279 support seeking natively */
280 int nb_index_entries;
281 unsigned int index_entries_allocated_size;
283 int64_t nb_frames; ///< number of frames in this stream if known or 0
285 #define MAX_REORDER_DELAY 4
286 int64_t pts_buffer[MAX_REORDER_DELAY+1];
289 #define AVFMTCTX_NOHEADER 0x0001 /* signal that no header is present
290 (streams are added dynamically) */
292 #define MAX_STREAMS 20
294 /* format I/O context */
295 typedef struct AVFormatContext {
296 const AVClass *av_class; /* set by av_alloc_format_context */
297 /* can only be iformat or oformat, not both at the same time */
298 struct AVInputFormat *iformat;
299 struct AVOutputFormat *oformat;
302 unsigned int nb_streams;
303 AVStream *streams[MAX_STREAMS];
304 char filename[1024]; /* input or output filename */
312 int year; /* ID3 year, 0 if none */
313 int track; /* track number, 0 if none */
314 char genre[32]; /* ID3 genre */
316 int ctx_flags; /* format specific flags, see AVFMTCTX_xx */
317 /* private data for pts handling (do not modify directly) */
318 /* This buffer is only needed when packets were already buffered but
319 not decoded, for example to get the codec parameters in mpeg
321 struct AVPacketList *packet_buffer;
323 /* decoding: position of the first frame of the component, in
324 AV_TIME_BASE fractional seconds. NEVER set this value directly:
325 it is deduced from the AVStream values. */
327 /* decoding: duration of the stream, in AV_TIME_BASE fractional
328 seconds. NEVER set this value directly: it is deduced from the
331 /* decoding: total file size. 0 if unknown */
333 /* decoding: total stream bitrate in bit/s, 0 if not
334 available. Never set it directly if the file_size and the
335 duration are known as ffmpeg can compute it automatically. */
338 /* av_read_frame() support */
340 const uint8_t *cur_ptr;
344 /* av_seek_frame() support */
345 int64_t data_offset; /* offset of the first packet */
353 #define AVFMT_NOOUTPUTLOOP -1
354 #define AVFMT_INFINITEOUTPUTLOOP 0
355 /* number of times to loop output in formats that support it */
359 #define AVFMT_FLAG_GENPTS 0x0001 ///< generate pts if missing even if it requires parsing future frames
360 #define AVFMT_FLAG_IGNIDX 0x0002 ///< ignore index
363 /* decoding: size of data to probe; encoding unused */
364 unsigned int probesize;
367 typedef struct AVPacketList {
369 struct AVPacketList *next;
372 extern AVInputFormat *first_iformat;
373 extern AVOutputFormat *first_oformat;
375 enum CodecID av_guess_image2_codec(const char *filename);
377 /* XXX: use automatic init with either ELF sections or C file parser */
385 void av_register_input_format(AVInputFormat *format);
386 void av_register_output_format(AVOutputFormat *format);
387 AVOutputFormat *guess_stream_format(const char *short_name,
388 const char *filename, const char *mime_type);
389 AVOutputFormat *guess_format(const char *short_name,
390 const char *filename, const char *mime_type);
391 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
392 const char *filename, const char *mime_type, enum CodecType type);
394 void av_hex_dump(FILE *f, uint8_t *buf, int size);
395 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
397 void av_register_all(void);
399 /* media file input */
400 AVInputFormat *av_find_input_format(const char *short_name);
401 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
402 int av_open_input_stream(AVFormatContext **ic_ptr,
403 ByteIOContext *pb, const char *filename,
404 AVInputFormat *fmt, AVFormatParameters *ap);
405 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename,
408 AVFormatParameters *ap);
409 /* no av_open for output, so applications will need this: */
410 AVFormatContext *av_alloc_format_context(void);
412 #define AVERROR_UNKNOWN (-1) /* unknown error */
413 #define AVERROR_IO (-2) /* i/o error */
414 #define AVERROR_NUMEXPECTED (-3) /* number syntax expected in filename */
415 #define AVERROR_INVALIDDATA (-4) /* invalid data found */
416 #define AVERROR_NOMEM (-5) /* not enough memory */
417 #define AVERROR_NOFMT (-6) /* unknown format */
418 #define AVERROR_NOTSUPP (-7) /* operation not supported */
420 int av_find_stream_info(AVFormatContext *ic);
421 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
422 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
423 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags);
424 int av_read_play(AVFormatContext *s);
425 int av_read_pause(AVFormatContext *s);
426 void av_close_input_file(AVFormatContext *s);
427 AVStream *av_new_stream(AVFormatContext *s, int id);
428 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
429 int pts_num, int pts_den);
431 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
432 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
433 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non keyframes
435 int av_find_default_stream_index(AVFormatContext *s);
436 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
437 int av_add_index_entry(AVStream *st,
438 int64_t pos, int64_t timestamp, int size, int distance, int flags);
439 int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
440 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
441 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 ));
443 /* media file output */
444 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);
445 int av_write_header(AVFormatContext *s);
446 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
447 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
448 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush);
450 int av_write_trailer(AVFormatContext *s);
452 void dump_format(AVFormatContext *ic,
456 int parse_image_size(int *width_ptr, int *height_ptr, const char *str);
457 int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg);
458 int64_t parse_date(const char *datestr, int duration);
460 int64_t av_gettime(void);
462 /* ffm specific for ffserver */
463 #define FFM_PACKET_SIZE 4096
464 offset_t ffm_read_write_index(int fd);
465 void ffm_write_write_index(int fd, offset_t pos);
466 void ffm_set_write_index(AVFormatContext *s, offset_t pos, offset_t file_size);
468 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info);
470 int av_get_frame_filename(char *buf, int buf_size,
471 const char *path, int number);
472 int av_filename_number_test(const char *filename);
475 int video_grab_init(void);
476 int audio_init(void);
479 int dv1394_init(void);
480 int dc1394_init(void);
482 #ifdef HAVE_AV_CONFIG_H
484 #include "os_support.h"
486 int strstart(const char *str, const char *val, const char **ptr);
487 int stristart(const char *str, const char *val, const char **ptr);
488 void pstrcpy(char *buf, int buf_size, const char *str);
489 char *pstrcat(char *buf, int buf_size, const char *s);
491 void __dynarray_add(unsigned long **tab_ptr, int *nb_ptr, unsigned long elem);
494 #define dynarray_add(tab, nb_ptr, elem)\
496 typeof(tab) _tab = (tab);\
497 typeof(elem) _elem = (elem);\
498 (void)sizeof(**_tab == _elem); /* check that types are compatible */\
499 __dynarray_add((unsigned long **)_tab, nb_ptr, (unsigned long)_elem);\
502 #define dynarray_add(tab, nb_ptr, elem)\
504 __dynarray_add((unsigned long **)(tab), nb_ptr, (unsigned long)(elem));\
508 time_t mktimegm(struct tm *tm);
509 struct tm *brktimegm(time_t secs, struct tm *tm);
510 const char *small_strptime(const char *p, const char *fmt,
514 int resolve_host(struct in_addr *sin_addr, const char *hostname);
516 void url_split(char *proto, int proto_size,
517 char *authorization, int authorization_size,
518 char *hostname, int hostname_size,
520 char *path, int path_size,
523 int match_ext(const char *filename, const char *extensions);
525 #endif /* HAVE_AV_CONFIG_H */
531 #endif /* AVFORMAT_H */