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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_INTERNAL_H | |
22 | #define AVFORMAT_INTERNAL_H | |
23 | ||
24 | #include <stdint.h> | |
25 | #include "avformat.h" | |
26 | ||
27 | #define MAX_URL_SIZE 4096 | |
28 | ||
29 | /** size of probe buffer, for guessing file type from file contents */ | |
30 | #define PROBE_BUF_MIN 2048 | |
31 | #define PROBE_BUF_MAX (1 << 20) | |
32 | ||
33 | #ifdef DEBUG | |
34 | # define hex_dump_debug(class, buf, size) av_hex_dump_log(class, AV_LOG_DEBUG, buf, size) | |
35 | #else | |
36 | # define hex_dump_debug(class, buf, size) | |
37 | #endif | |
38 | ||
39 | typedef struct AVCodecTag { | |
40 | enum AVCodecID id; | |
41 | unsigned int tag; | |
42 | } AVCodecTag; | |
43 | ||
44 | typedef struct CodecMime{ | |
45 | char str[32]; | |
46 | enum AVCodecID id; | |
47 | } CodecMime; | |
48 | ||
49 | struct AVFormatInternal { | |
50 | /** | |
51 | * Number of streams relevant for interleaving. | |
52 | * Muxing only. | |
53 | */ | |
54 | int nb_interleaved_streams; | |
55 | ||
56 | int inject_global_side_data; | |
57 | }; | |
58 | ||
59 | #ifdef __GNUC__ | |
60 | #define dynarray_add(tab, nb_ptr, elem)\ | |
61 | do {\ | |
62 | __typeof__(tab) _tab = (tab);\ | |
63 | __typeof__(elem) _elem = (elem);\ | |
64 | (void)sizeof(**_tab == _elem); /* check that types are compatible */\ | |
65 | av_dynarray_add(_tab, nb_ptr, _elem);\ | |
66 | } while(0) | |
67 | #else | |
68 | #define dynarray_add(tab, nb_ptr, elem)\ | |
69 | do {\ | |
70 | av_dynarray_add((tab), nb_ptr, (elem));\ | |
71 | } while(0) | |
72 | #endif | |
73 | ||
74 | struct tm *ff_brktimegm(time_t secs, struct tm *tm); | |
75 | ||
76 | char *ff_data_to_hex(char *buf, const uint8_t *src, int size, int lowercase); | |
77 | ||
78 | /** | |
79 | * Parse a string of hexadecimal strings. Any space between the hexadecimal | |
80 | * digits is ignored. | |
81 | * | |
82 | * @param data if non-null, the parsed data is written to this pointer | |
83 | * @param p the string to parse | |
84 | * @return the number of bytes written (or to be written, if data is null) | |
85 | */ | |
86 | int ff_hex_to_data(uint8_t *data, const char *p); | |
87 | ||
88 | void ff_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx); | |
89 | ||
90 | /** | |
91 | * Add packet to AVFormatContext->packet_buffer list, determining its | |
92 | * interleaved position using compare() function argument. | |
93 | * @return 0, or < 0 on error | |
94 | */ | |
95 | int ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt, | |
96 | int (*compare)(AVFormatContext *, AVPacket *, AVPacket *)); | |
97 | ||
98 | void ff_read_frame_flush(AVFormatContext *s); | |
99 | ||
100 | #define NTP_OFFSET 2208988800ULL | |
101 | #define NTP_OFFSET_US (NTP_OFFSET * 1000000ULL) | |
102 | ||
103 | /** Get the current time since NTP epoch in microseconds. */ | |
104 | uint64_t ff_ntp_time(void); | |
105 | ||
106 | /** | |
107 | * Append the media-specific SDP fragment for the media stream c | |
108 | * to the buffer buff. | |
109 | * | |
110 | * Note, the buffer needs to be initialized, since it is appended to | |
111 | * existing content. | |
112 | * | |
113 | * @param buff the buffer to append the SDP fragment to | |
114 | * @param size the size of the buff buffer | |
115 | * @param st the AVStream of the media to describe | |
116 | * @param idx the global stream index | |
117 | * @param dest_addr the destination address of the media stream, may be NULL | |
118 | * @param dest_type the destination address type, may be NULL | |
119 | * @param port the destination port of the media stream, 0 if unknown | |
120 | * @param ttl the time to live of the stream, 0 if not multicast | |
121 | * @param fmt the AVFormatContext, which might contain options modifying | |
122 | * the generated SDP | |
123 | */ | |
124 | void ff_sdp_write_media(char *buff, int size, AVStream *st, int idx, | |
125 | const char *dest_addr, const char *dest_type, | |
126 | int port, int ttl, AVFormatContext *fmt); | |
127 | ||
128 | /** | |
129 | * Write a packet to another muxer than the one the user originally | |
130 | * intended. Useful when chaining muxers, where one muxer internally | |
131 | * writes a received packet to another muxer. | |
132 | * | |
133 | * @param dst the muxer to write the packet to | |
134 | * @param dst_stream the stream index within dst to write the packet to | |
135 | * @param pkt the packet to be written | |
136 | * @param src the muxer the packet originally was intended for | |
137 | * @param interleave 0->use av_write_frame, 1->av_write_interleaved_frame | |
138 | * @return the value av_write_frame returned | |
139 | */ | |
140 | int ff_write_chained(AVFormatContext *dst, int dst_stream, AVPacket *pkt, | |
141 | AVFormatContext *src, int interleave); | |
142 | ||
143 | /** | |
144 | * Get the length in bytes which is needed to store val as v. | |
145 | */ | |
146 | int ff_get_v_length(uint64_t val); | |
147 | ||
148 | /** | |
149 | * Put val using a variable number of bytes. | |
150 | */ | |
151 | void ff_put_v(AVIOContext *bc, uint64_t val); | |
152 | ||
153 | /** | |
154 | * Read a whole line of text from AVIOContext. Stop reading after reaching | |
155 | * either a \\n, a \\0 or EOF. The returned string is always \\0-terminated, | |
156 | * and may be truncated if the buffer is too small. | |
157 | * | |
158 | * @param s the read-only AVIOContext | |
159 | * @param buf buffer to store the read line | |
160 | * @param maxlen size of the buffer | |
161 | * @return the length of the string written in the buffer, not including the | |
162 | * final \\0 | |
163 | */ | |
164 | int ff_get_line(AVIOContext *s, char *buf, int maxlen); | |
165 | ||
166 | #define SPACE_CHARS " \t\r\n" | |
167 | ||
168 | /** | |
169 | * Callback function type for ff_parse_key_value. | |
170 | * | |
171 | * @param key a pointer to the key | |
172 | * @param key_len the number of bytes that belong to the key, including the '=' | |
173 | * char | |
174 | * @param dest return the destination pointer for the value in *dest, may | |
175 | * be null to ignore the value | |
176 | * @param dest_len the length of the *dest buffer | |
177 | */ | |
178 | typedef void (*ff_parse_key_val_cb)(void *context, const char *key, | |
179 | int key_len, char **dest, int *dest_len); | |
180 | /** | |
181 | * Parse a string with comma-separated key=value pairs. The value strings | |
182 | * may be quoted and may contain escaped characters within quoted strings. | |
183 | * | |
184 | * @param str the string to parse | |
185 | * @param callback_get_buf function that returns where to store the | |
186 | * unescaped value string. | |
187 | * @param context the opaque context pointer to pass to callback_get_buf | |
188 | */ | |
189 | void ff_parse_key_value(const char *str, ff_parse_key_val_cb callback_get_buf, | |
190 | void *context); | |
191 | ||
192 | /** | |
193 | * Find stream index based on format-specific stream ID | |
194 | * @return stream index, or < 0 on error | |
195 | */ | |
196 | int ff_find_stream_index(AVFormatContext *s, int id); | |
197 | ||
198 | /** | |
199 | * Internal version of av_index_search_timestamp | |
200 | */ | |
201 | int ff_index_search_timestamp(const AVIndexEntry *entries, int nb_entries, | |
202 | int64_t wanted_timestamp, int flags); | |
203 | ||
204 | /** | |
205 | * Internal version of av_add_index_entry | |
206 | */ | |
207 | int ff_add_index_entry(AVIndexEntry **index_entries, | |
208 | int *nb_index_entries, | |
209 | unsigned int *index_entries_allocated_size, | |
210 | int64_t pos, int64_t timestamp, int size, int distance, int flags); | |
211 | ||
212 | /** | |
213 | * Add a new chapter. | |
214 | * | |
215 | * @param s media file handle | |
216 | * @param id unique ID for this chapter | |
217 | * @param start chapter start time in time_base units | |
218 | * @param end chapter end time in time_base units | |
219 | * @param title chapter title | |
220 | * | |
221 | * @return AVChapter or NULL on error | |
222 | */ | |
223 | AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base, | |
224 | int64_t start, int64_t end, const char *title); | |
225 | ||
226 | /** | |
227 | * Ensure the index uses less memory than the maximum specified in | |
228 | * AVFormatContext.max_index_size by discarding entries if it grows | |
229 | * too large. | |
230 | */ | |
231 | void ff_reduce_index(AVFormatContext *s, int stream_index); | |
232 | ||
233 | enum AVCodecID ff_guess_image2_codec(const char *filename); | |
234 | ||
235 | /** | |
236 | * Convert a date string in ISO8601 format to Unix timestamp. | |
237 | */ | |
238 | int64_t ff_iso8601_to_unix_time(const char *datestr); | |
239 | ||
240 | /** | |
241 | * Perform a binary search using av_index_search_timestamp() and | |
242 | * AVInputFormat.read_timestamp(). | |
243 | * | |
244 | * @param target_ts target timestamp in the time base of the given stream | |
245 | * @param stream_index stream number | |
246 | */ | |
247 | int ff_seek_frame_binary(AVFormatContext *s, int stream_index, | |
248 | int64_t target_ts, int flags); | |
249 | ||
250 | /** | |
251 | * Update cur_dts of all streams based on the given timestamp and AVStream. | |
252 | * | |
253 | * Stream ref_st unchanged, others set cur_dts in their native time base. | |
254 | * Only needed for timestamp wrapping or if (dts not set and pts!=dts). | |
255 | * @param timestamp new dts expressed in time_base of param ref_st | |
256 | * @param ref_st reference stream giving time_base of param timestamp | |
257 | */ | |
258 | void ff_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp); | |
259 | ||
260 | int ff_find_last_ts(AVFormatContext *s, int stream_index, int64_t *ts, int64_t *pos, | |
261 | int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t )); | |
262 | ||
263 | /** | |
264 | * Perform a binary search using read_timestamp(). | |
265 | * | |
266 | * @param target_ts target timestamp in the time base of the given stream | |
267 | * @param stream_index stream number | |
268 | */ | |
269 | int64_t ff_gen_search(AVFormatContext *s, int stream_index, | |
270 | int64_t target_ts, int64_t pos_min, | |
271 | int64_t pos_max, int64_t pos_limit, | |
272 | int64_t ts_min, int64_t ts_max, | |
273 | int flags, int64_t *ts_ret, | |
274 | int64_t (*read_timestamp)(struct AVFormatContext *, int , int64_t *, int64_t )); | |
275 | ||
276 | /** | |
277 | * Set the time base and wrapping info for a given stream. This will be used | |
278 | * to interpret the stream's timestamps. If the new time base is invalid | |
279 | * (numerator or denominator are non-positive), it leaves the stream | |
280 | * unchanged. | |
281 | * | |
282 | * @param s stream | |
283 | * @param pts_wrap_bits number of bits effectively used by the pts | |
284 | * (used for wrap control) | |
285 | * @param pts_num time base numerator | |
286 | * @param pts_den time base denominator | |
287 | */ | |
288 | void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, | |
289 | unsigned int pts_num, unsigned int pts_den); | |
290 | ||
291 | /** | |
292 | * Add side data to a packet for changing parameters to the given values. | |
293 | * Parameters set to 0 aren't included in the change. | |
294 | */ | |
295 | int ff_add_param_change(AVPacket *pkt, int32_t channels, | |
296 | uint64_t channel_layout, int32_t sample_rate, | |
297 | int32_t width, int32_t height); | |
298 | ||
299 | /** | |
300 | * Set the timebase for each stream from the corresponding codec timebase and | |
301 | * print it. | |
302 | */ | |
303 | int ff_framehash_write_header(AVFormatContext *s); | |
304 | ||
305 | /** | |
306 | * Read a transport packet from a media file. | |
307 | * | |
308 | * @param s media file handle | |
309 | * @param pkt is filled | |
310 | * @return 0 if OK, AVERROR_xxx on error | |
311 | */ | |
312 | int ff_read_packet(AVFormatContext *s, AVPacket *pkt); | |
313 | ||
314 | /** | |
315 | * Interleave a packet per dts in an output media file. | |
316 | * | |
317 | * Packets with pkt->destruct == av_destruct_packet will be freed inside this | |
318 | * function, so they cannot be used after it. Note that calling av_free_packet() | |
319 | * on them is still safe. | |
320 | * | |
321 | * @param s media file handle | |
322 | * @param out the interleaved packet will be output here | |
323 | * @param pkt the input packet | |
324 | * @param flush 1 if no further packets are available as input and all | |
325 | * remaining packets should be output | |
326 | * @return 1 if a packet was output, 0 if no packet could be output, | |
327 | * < 0 if an error occurred | |
328 | */ | |
329 | int ff_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, | |
330 | AVPacket *pkt, int flush); | |
331 | ||
332 | void ff_free_stream(AVFormatContext *s, AVStream *st); | |
333 | ||
334 | /** | |
335 | * Return the frame duration in seconds. Return 0 if not available. | |
336 | */ | |
337 | void ff_compute_frame_duration(int *pnum, int *pden, AVStream *st, | |
338 | AVCodecParserContext *pc, AVPacket *pkt); | |
339 | ||
340 | unsigned int ff_codec_get_tag(const AVCodecTag *tags, enum AVCodecID id); | |
341 | ||
342 | enum AVCodecID ff_codec_get_id(const AVCodecTag *tags, unsigned int tag); | |
343 | ||
344 | /** | |
345 | * Select a PCM codec based on the given parameters. | |
346 | * | |
347 | * @param bps bits-per-sample | |
348 | * @param flt floating-point | |
349 | * @param be big-endian | |
350 | * @param sflags signed flags. each bit corresponds to one byte of bit depth. | |
351 | * e.g. the 1st bit indicates if 8-bit should be signed or | |
352 | * unsigned, the 2nd bit indicates if 16-bit should be signed or | |
353 | * unsigned, etc... This is useful for formats such as WAVE where | |
354 | * only 8-bit is unsigned and all other bit depths are signed. | |
355 | * @return a PCM codec id or AV_CODEC_ID_NONE | |
356 | */ | |
357 | enum AVCodecID ff_get_pcm_codec_id(int bps, int flt, int be, int sflags); | |
358 | ||
359 | /** | |
360 | * Chooses a timebase for muxing the specified stream. | |
361 | * | |
362 | * The chosen timebase allows sample accurate timestamps based | |
363 | * on the framerate or sample rate for audio streams. It also is | |
364 | * at least as precise as 1/min_precision would be. | |
365 | */ | |
366 | AVRational ff_choose_timebase(AVFormatContext *s, AVStream *st, int min_precision); | |
367 | ||
368 | /** | |
369 | * Generate standard extradata for AVC-Intra based on width/height and field | |
370 | * order. | |
371 | */ | |
372 | int ff_generate_avci_extradata(AVStream *st); | |
373 | ||
374 | /** | |
375 | * Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end | |
376 | * which is always set to 0. | |
377 | * | |
378 | * @param size size of extradata | |
379 | * @return 0 if OK, AVERROR_xxx on error | |
380 | */ | |
381 | int ff_alloc_extradata(AVCodecContext *avctx, int size); | |
382 | ||
383 | /** | |
384 | * Allocate extradata with additional FF_INPUT_BUFFER_PADDING_SIZE at end | |
385 | * which is always set to 0 and fill it from pb. | |
386 | * | |
387 | * @param size size of extradata | |
388 | * @return >= 0 if OK, AVERROR_xxx on error | |
389 | */ | |
390 | int ff_get_extradata(AVCodecContext *avctx, AVIOContext *pb, int size); | |
391 | ||
392 | /** | |
393 | * add frame for rfps calculation. | |
394 | * | |
395 | * @param dts timestamp of the i-th frame | |
396 | * @return 0 if OK, AVERROR_xxx on error | |
397 | */ | |
398 | int ff_rfps_add_frame(AVFormatContext *ic, AVStream *st, int64_t dts); | |
399 | ||
400 | void ff_rfps_calculate(AVFormatContext *ic); | |
401 | ||
402 | /** | |
403 | * Flags for AVFormatContext.write_uncoded_frame() | |
404 | */ | |
405 | enum AVWriteUncodedFrameFlags { | |
406 | ||
407 | /** | |
408 | * Query whether the feature is possible on this stream. | |
409 | * The frame argument is ignored. | |
410 | */ | |
411 | AV_WRITE_UNCODED_FRAME_QUERY = 0x0001, | |
412 | ||
413 | }; | |
414 | ||
415 | ||
416 | #endif /* AVFORMAT_INTERNAL_H */ |