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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_AVFORMAT_H | |
| 22 #define AVFORMAT_AVFORMAT_H | |
| 23 | |
| 24 #define LIBAVFORMAT_VERSION_MAJOR 52 | |
| 25 #define LIBAVFORMAT_VERSION_MINOR 32 | |
| 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 struct AVFormatContext; | |
| 50 | |
| 51 | |
| 52 /* | |
| 53 * Public Metadata API. | |
| 54 * The metadata API allows libavformat to export metadata tags to a client | |
| 55 * application using a sequence of key/value pairs. | |
| 56 * Important concepts to keep in mind: | |
| 57 * 1. Keys are unique; there can never be 2 tags with the same key. This is | |
| 58 * also meant semantically, i.e., a demuxer should not knowingly produce | |
| 59 * several keys that are literally different but semantically identical. | |
| 60 * E.g., key=Author5, key=Author6. In this example, all authors must be | |
| 61 * placed in the same tag. | |
| 62 * 2. Metadata is flat, not hierarchical; there are no subtags. If you | |
| 63 * want to store, e.g., the email address of the child of producer Alice | |
| 64 * and actor Bob, that could have key=alice_and_bobs_childs_email_address. | |
| 65 * 3. A tag whose value is localized for a particular language is appended | |
| 66 * with a dash character ('-') and the ISO 639-2/B 3-letter language code. | |
| 67 * For example: Author-ger=Michael, Author-eng=Mike | |
| 68 * The original/default language is in the unqualified "Author" tag. | |
| 69 * A demuxer should set a default if it sets any translated tag. | |
| 70 */ | |
| 71 | |
| 72 #define AV_METADATA_MATCH_CASE 1 | |
| 73 #define AV_METADATA_IGNORE_SUFFIX 2 | |
| 74 | |
| 75 typedef struct { | |
| 76 char *key; | |
| 77 char *value; | |
| 78 }AVMetadataTag; | |
| 79 | |
| 80 typedef struct AVMetadata AVMetadata; | |
| 81 typedef struct AVMetadataConv AVMetadataConv; | |
| 82 | |
| 83 /** | |
| 84 * Gets a metadata element with matching key. | |
| 85 * @param prev Set to the previous matching element to find the next. | |
| 86 * @param flags Allows case as well as suffix-insensitive comparisons. | |
| 87 * @return Found tag or NULL, changing key or value leads to undefined behavior. | |
| 88 */ | |
| 89 AVMetadataTag * | |
| 90 av_metadata_get(AVMetadata *m, const char *key, const AVMetadataTag *prev, int f
lags); | |
| 91 | |
| 92 /** | |
| 93 * Sets the given tag in m, overwriting an existing tag. | |
| 94 * @param key tag key to add to m (will be av_strduped) | |
| 95 * @param value tag value to add to m (will be av_strduped) | |
| 96 * @return >= 0 on success otherwise an error code <0 | |
| 97 */ | |
| 98 int av_metadata_set(AVMetadata **pm, const char *key, const char *value); | |
| 99 | |
| 100 /** | |
| 101 * Convert all the metadata sets from ctx according to the source and | |
| 102 * destination conversion tables. | |
| 103 * @param d_conv destination tags format conversion table | |
| 104 * @param s_conv source tags format conversion table | |
| 105 */ | |
| 106 void av_metadata_conv(struct AVFormatContext *ctx,const AVMetadataConv *d_conv, | |
| 107 const AVMetadataConv *s_conv); | |
| 108 | |
| 109 /** | |
| 110 * Frees all the memory allocated for an AVMetadata struct. | |
| 111 */ | |
| 112 void av_metadata_free(AVMetadata **m); | |
| 113 | |
| 114 | |
| 115 /* packet functions */ | |
| 116 | |
| 117 | |
| 118 /** | |
| 119 * Allocate and read the payload of a packet and initialize its fields with | |
| 120 * default values. | |
| 121 * | |
| 122 * @param pkt packet | |
| 123 * @param size desired payload size | |
| 124 * @return >0 (read size) if OK, AVERROR_xxx otherwise | |
| 125 */ | |
| 126 int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size); | |
| 127 | |
| 128 | |
| 129 /*************************************************/ | |
| 130 /* fractional numbers for exact pts handling */ | |
| 131 | |
| 132 /** | |
| 133 * The exact value of the fractional number is: 'val + num / den'. | |
| 134 * num is assumed to be 0 <= num < den. | |
| 135 */ | |
| 136 typedef struct AVFrac { | |
| 137 int64_t val, num, den; | |
| 138 } AVFrac; | |
| 139 | |
| 140 /*************************************************/ | |
| 141 /* input/output formats */ | |
| 142 | |
| 143 struct AVCodecTag; | |
| 144 | |
| 145 /** This structure contains the data a format has to probe a file. */ | |
| 146 typedef struct AVProbeData { | |
| 147 const char *filename; | |
| 148 unsigned char *buf; | |
| 149 int buf_size; | |
| 150 } AVProbeData; | |
| 151 | |
| 152 #define AVPROBE_SCORE_MAX 100 ///< maximum score, half of that is
used for file-extension-based detection | |
| 153 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the en
d of the probe buffer | |
| 154 | |
| 155 typedef struct AVFormatParameters { | |
| 156 AVRational time_base; | |
| 157 int sample_rate; | |
| 158 int channels; | |
| 159 int width; | |
| 160 int height; | |
| 161 enum PixelFormat pix_fmt; | |
| 162 int channel; /**< Used to select DV channel. */ | |
| 163 const char *standard; /**< TV standard, NTSC, PAL, SECAM */ | |
| 164 unsigned int mpeg2ts_raw:1; /**< Force raw MPEG-2 transport stream output,
if possible. */ | |
| 165 unsigned int mpeg2ts_compute_pcr:1; /**< Compute exact PCR for each transpor
t | |
| 166 stream packet (only meaningful if | |
| 167 mpeg2ts_raw is TRUE). */ | |
| 168 unsigned int initial_pause:1; /**< Do not begin to play the stream | |
| 169 immediately (RTSP only). */ | |
| 170 unsigned int prealloced_context:1; | |
| 171 #if LIBAVFORMAT_VERSION_INT < (53<<16) | |
| 172 enum CodecID video_codec_id; | |
| 173 enum CodecID audio_codec_id; | |
| 174 #endif | |
| 175 } AVFormatParameters; | |
| 176 | |
| 177 //! Demuxer will use url_fopen, no opened file should be provided by the caller. | |
| 178 #define AVFMT_NOFILE 0x0001 | |
| 179 #define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */ | |
| 180 #define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */ | |
| 181 #define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for | |
| 182 raw picture data. */ | |
| 183 #define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */ | |
| 184 #define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestam
ps. */ | |
| 185 #define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */ | |
| 186 #define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities.
*/ | |
| 187 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */ | |
| 188 | |
| 189 typedef struct AVOutputFormat { | |
| 190 const char *name; | |
| 191 /** | |
| 192 * Descriptive name for the format, meant to be more human-readable | |
| 193 * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro | |
| 194 * to define it. | |
| 195 */ | |
| 196 const char *long_name; | |
| 197 const char *mime_type; | |
| 198 const char *extensions; /**< comma-separated filename extensions */ | |
| 199 /** size of private data so that it can be allocated in the wrapper */ | |
| 200 int priv_data_size; | |
| 201 /* output support */ | |
| 202 enum CodecID audio_codec; /**< default audio codec */ | |
| 203 enum CodecID video_codec; /**< default video codec */ | |
| 204 int (*write_header)(struct AVFormatContext *); | |
| 205 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt); | |
| 206 int (*write_trailer)(struct AVFormatContext *); | |
| 207 /** can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_GLOBALHEADER */ | |
| 208 int flags; | |
| 209 /** Currently only used to set pixel format if not YUV420P. */ | |
| 210 int (*set_parameters)(struct AVFormatContext *, AVFormatParameters *); | |
| 211 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out, | |
| 212 AVPacket *in, int flush); | |
| 213 | |
| 214 /** | |
| 215 * List of supported codec_id-codec_tag pairs, ordered by "better | |
| 216 * choice first". The arrays are all terminated by CODEC_ID_NONE. | |
| 217 */ | |
| 218 const struct AVCodecTag * const *codec_tag; | |
| 219 | |
| 220 enum CodecID subtitle_codec; /**< default subtitle codec */ | |
| 221 | |
| 222 const AVMetadataConv *metadata_conv; | |
| 223 | |
| 224 /* private fields */ | |
| 225 struct AVOutputFormat *next; | |
| 226 } AVOutputFormat; | |
| 227 | |
| 228 typedef struct AVInputFormat { | |
| 229 const char *name; | |
| 230 /** | |
| 231 * Descriptive name for the format, meant to be more human-readable | |
| 232 * than \p name. You \e should use the NULL_IF_CONFIG_SMALL() macro | |
| 233 * to define it. | |
| 234 */ | |
| 235 const char *long_name; | |
| 236 /** Size of private data so that it can be allocated in the wrapper. */ | |
| 237 int priv_data_size; | |
| 238 /** | |
| 239 * Tell if a given file has a chance of being parsed as this format. | |
| 240 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes | |
| 241 * big so you do not have to check for that unless you need more. | |
| 242 */ | |
| 243 int (*read_probe)(AVProbeData *); | |
| 244 /** Read the format header and initialize the AVFormatContext | |
| 245 structure. Return 0 if OK. 'ap' if non-NULL contains | |
| 246 additional parameters. Only used in raw format right | |
| 247 now. 'av_new_stream' should be called to create new streams. */ | |
| 248 int (*read_header)(struct AVFormatContext *, | |
| 249 AVFormatParameters *ap); | |
| 250 /** Read one packet and put it in 'pkt'. pts and flags are also | |
| 251 set. 'av_new_stream' can be called only if the flag | |
| 252 AVFMTCTX_NOHEADER is used. | |
| 253 @return 0 on success, < 0 on error. | |
| 254 When returning an error, pkt must not have been allocated | |
| 255 or must be freed before returning */ | |
| 256 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt); | |
| 257 /** Close the stream. The AVFormatContext and AVStreams are not | |
| 258 freed by this function */ | |
| 259 int (*read_close)(struct AVFormatContext *); | |
| 260 | |
| 261 #if LIBAVFORMAT_VERSION_MAJOR < 53 | |
| 262 /** | |
| 263 * Seek to a given timestamp relative to the frames in | |
| 264 * stream component stream_index. | |
| 265 * @param stream_index Must not be -1. | |
| 266 * @param flags Selects which direction should be preferred if no exact | |
| 267 * match is available. | |
| 268 * @return >= 0 on success (but not necessarily the new offset) | |
| 269 */ | |
| 270 int (*read_seek)(struct AVFormatContext *, | |
| 271 int stream_index, int64_t timestamp, int flags); | |
| 272 #endif | |
| 273 /** | |
| 274 * Gets the next timestamp in stream[stream_index].time_base units. | |
| 275 * @return the timestamp or AV_NOPTS_VALUE if an error occurred | |
| 276 */ | |
| 277 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index, | |
| 278 int64_t *pos, int64_t pos_limit); | |
| 279 /** Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER. */ | |
| 280 int flags; | |
| 281 /** If extensions are defined, then no probe is done. You should | |
| 282 usually not use extension format guessing because it is not | |
| 283 reliable enough */ | |
| 284 const char *extensions; | |
| 285 /** General purpose read-only value that the format can use. */ | |
| 286 int value; | |
| 287 | |
| 288 /** Start/resume playing - only meaningful if using a network-based format | |
| 289 (RTSP). */ | |
| 290 int (*read_play)(struct AVFormatContext *); | |
| 291 | |
| 292 /** Pause playing - only meaningful if using a network-based format | |
| 293 (RTSP). */ | |
| 294 int (*read_pause)(struct AVFormatContext *); | |
| 295 | |
| 296 const struct AVCodecTag * const *codec_tag; | |
| 297 | |
| 298 /** | |
| 299 * Seek to timestamp ts. | |
| 300 * Seeking will be done so that the point from which all active streams | |
| 301 * can be presented successfully will be closest to ts and within min/max_ts
. | |
| 302 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL
. | |
| 303 */ | |
| 304 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_t
s, int64_t ts, int64_t max_ts, int flags); | |
| 305 | |
| 306 const AVMetadataConv *metadata_conv; | |
| 307 | |
| 308 /* private fields */ | |
| 309 struct AVInputFormat *next; | |
| 310 } AVInputFormat; | |
| 311 | |
| 312 enum AVStreamParseType { | |
| 313 AVSTREAM_PARSE_NONE, | |
| 314 AVSTREAM_PARSE_FULL, /**< full parsing and repack */ | |
| 315 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */ | |
| 316 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps
for frames not starting on a packet boundary */ | |
| 317 }; | |
| 318 | |
| 319 typedef struct AVIndexEntry { | |
| 320 int64_t pos; | |
| 321 int64_t timestamp; | |
| 322 #define AVINDEX_KEYFRAME 0x0001 | |
| 323 int flags:2; | |
| 324 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). | |
| 325 int min_distance; /**< Minimum distance between this and the previou
s keyframe, used to avoid unneeded searching. */ | |
| 326 } AVIndexEntry; | |
| 327 | |
| 328 #define AV_DISPOSITION_DEFAULT 0x0001 | |
| 329 #define AV_DISPOSITION_DUB 0x0002 | |
| 330 #define AV_DISPOSITION_ORIGINAL 0x0004 | |
| 331 #define AV_DISPOSITION_COMMENT 0x0008 | |
| 332 #define AV_DISPOSITION_LYRICS 0x0010 | |
| 333 #define AV_DISPOSITION_KARAOKE 0x0020 | |
| 334 | |
| 335 /** | |
| 336 * Stream structure. | |
| 337 * New fields can be added to the end with minor version bumps. | |
| 338 * Removal, reordering and changes to existing fields require a major | |
| 339 * version bump. | |
| 340 * sizeof(AVStream) must not be used outside libav*. | |
| 341 */ | |
| 342 typedef struct AVStream { | |
| 343 int index; /**< stream index in AVFormatContext */ | |
| 344 int id; /**< format-specific stream ID */ | |
| 345 AVCodecContext *codec; /**< codec context */ | |
| 346 /** | |
| 347 * Real base framerate of the stream. | |
| 348 * This is the lowest framerate with which all timestamps can be | |
| 349 * represented accurately (it is the least common multiple of all | |
| 350 * framerates in the stream). Note, this value is just a guess! | |
| 351 * For example, if the time base is 1/90000 and all frames have either | |
| 352 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1. | |
| 353 */ | |
| 354 AVRational r_frame_rate; | |
| 355 void *priv_data; | |
| 356 | |
| 357 /* internal data used in av_find_stream_info() */ | |
| 358 int64_t first_dts; | |
| 359 /** encoding: pts generation when outputting stream */ | |
| 360 struct AVFrac pts; | |
| 361 | |
| 362 /** | |
| 363 * This is the fundamental unit of time (in seconds) in terms | |
| 364 * of which frame timestamps are represented. For fixed-fps content, | |
| 365 * time base should be 1/framerate and timestamp increments should be 1. | |
| 366 */ | |
| 367 AVRational time_base; | |
| 368 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */ | |
| 369 /* ffmpeg.c private use */ | |
| 370 int stream_copy; /**< If set, just copy stream. */ | |
| 371 enum AVDiscard discard; ///< Selects which packets can be discarded at will
and do not need to be demuxed. | |
| 372 //FIXME move stuff to a flags field? | |
| 373 /** Quality, as it has been removed from AVCodecContext and put in AVVideoFr
ame. | |
| 374 * MN: dunno if that is the right place for it */ | |
| 375 float quality; | |
| 376 /** | |
| 377 * Decoding: pts of the first frame of the stream, in stream time base. | |
| 378 * Only set this if you are absolutely 100% sure that the value you set | |
| 379 * it to really is the pts of the first frame. | |
| 380 * This may be undefined (AV_NOPTS_VALUE). | |
| 381 * @note The ASF header does NOT contain a correct start_time the ASF | |
| 382 * demuxer must NOT set this. | |
| 383 */ | |
| 384 int64_t start_time; | |
| 385 /** | |
| 386 * Decoding: duration of the stream, in stream time base. | |
| 387 * If a source file does not specify a duration, but does specify | |
| 388 * a bitrate, this value will be estimated from bitrate and file size. | |
| 389 */ | |
| 390 int64_t duration; | |
| 391 | |
| 392 #if LIBAVFORMAT_VERSION_INT < (53<<16) | |
| 393 char language[4]; /** ISO 639-2/B 3-letter language code (empty string if un
defined) */ | |
| 394 #endif | |
| 395 | |
| 396 /* av_read_frame() support */ | |
| 397 enum AVStreamParseType need_parsing; | |
| 398 struct AVCodecParserContext *parser; | |
| 399 | |
| 400 int64_t cur_dts; | |
| 401 int last_IP_duration; | |
| 402 int64_t last_IP_pts; | |
| 403 /* av_seek_frame() support */ | |
| 404 AVIndexEntry *index_entries; /**< Only used if the format does not | |
| 405 support seeking natively. */ | |
| 406 int nb_index_entries; | |
| 407 unsigned int index_entries_allocated_size; | |
| 408 | |
| 409 int64_t nb_frames; ///< number of frames in this stream if k
nown or 0 | |
| 410 | |
| 411 #if LIBAVFORMAT_VERSION_INT < (53<<16) | |
| 412 int64_t unused[4+1]; | |
| 413 | |
| 414 char *filename; /**< source filename of the stream */ | |
| 415 #endif | |
| 416 | |
| 417 int disposition; /**< AV_DISPOSITION_* bit field */ | |
| 418 | |
| 419 AVProbeData probe_data; | |
| 420 #define MAX_REORDER_DELAY 16 | |
| 421 int64_t pts_buffer[MAX_REORDER_DELAY+1]; | |
| 422 | |
| 423 /** | |
| 424 * sample aspect ratio (0 if unknown) | |
| 425 * - encoding: Set by user. | |
| 426 * - decoding: Set by libavformat. | |
| 427 */ | |
| 428 AVRational sample_aspect_ratio; | |
| 429 | |
| 430 AVMetadata *metadata; | |
| 431 | |
| 432 /* av_read_frame() support */ | |
| 433 const uint8_t *cur_ptr; | |
| 434 int cur_len; | |
| 435 AVPacket cur_pkt; | |
| 436 | |
| 437 // Timestamp generation support: | |
| 438 /** | |
| 439 * Timestamp corresponding to the last dts sync point. | |
| 440 * | |
| 441 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and | |
| 442 * a DTS is received from the underlying container. Otherwise set to | |
| 443 * AV_NOPTS_VALUE by default. | |
| 444 */ | |
| 445 int64_t reference_dts; | |
| 446 } AVStream; | |
| 447 | |
| 448 #define AV_PROGRAM_RUNNING 1 | |
| 449 | |
| 450 /** | |
| 451 * New fields can be added to the end with minor version bumps. | |
| 452 * Removal, reordering and changes to existing fields require a major | |
| 453 * version bump. | |
| 454 * sizeof(AVProgram) must not be used outside libav*. | |
| 455 */ | |
| 456 typedef struct AVProgram { | |
| 457 int id; | |
| 458 #if LIBAVFORMAT_VERSION_INT < (53<<16) | |
| 459 char *provider_name; ///< network name for DVB streams | |
| 460 char *name; ///< service name for DVB streams | |
| 461 #endif | |
| 462 int flags; | |
| 463 enum AVDiscard discard; ///< selects which program to discard and whi
ch to feed to the caller | |
| 464 unsigned int *stream_index; | |
| 465 unsigned int nb_stream_indexes; | |
| 466 AVMetadata *metadata; | |
| 467 } AVProgram; | |
| 468 | |
| 469 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present | |
| 470 (streams are added dynamically) */ | |
| 471 | |
| 472 typedef struct AVChapter { | |
| 473 int id; ///< unique ID to identify the chapter | |
| 474 AVRational time_base; ///< time base in which the start/end timestamps are
specified | |
| 475 int64_t start, end; ///< chapter start/end time in time_base units | |
| 476 #if LIBAVFORMAT_VERSION_INT < (53<<16) | |
| 477 char *title; ///< chapter title | |
| 478 #endif | |
| 479 AVMetadata *metadata; | |
| 480 } AVChapter; | |
| 481 | |
| 482 #define MAX_STREAMS 20 | |
| 483 | |
| 484 /** | |
| 485 * Format I/O context. | |
| 486 * New fields can be added to the end with minor version bumps. | |
| 487 * Removal, reordering and changes to existing fields require a major | |
| 488 * version bump. | |
| 489 * sizeof(AVFormatContext) must not be used outside libav*. | |
| 490 */ | |
| 491 typedef struct AVFormatContext { | |
| 492 const AVClass *av_class; /**< Set by avformat_alloc_context. */ | |
| 493 /* Can only be iformat or oformat, not both at the same time. */ | |
| 494 struct AVInputFormat *iformat; | |
| 495 struct AVOutputFormat *oformat; | |
| 496 void *priv_data; | |
| 497 ByteIOContext *pb; | |
| 498 unsigned int nb_streams; | |
| 499 AVStream *streams[MAX_STREAMS]; | |
| 500 char filename[1024]; /**< input or output filename */ | |
| 501 /* stream info */ | |
| 502 int64_t timestamp; | |
| 503 #if LIBAVFORMAT_VERSION_INT < (53<<16) | |
| 504 char title[512]; | |
| 505 char author[512]; | |
| 506 char copyright[512]; | |
| 507 char comment[512]; | |
| 508 char album[512]; | |
| 509 int year; /**< ID3 year, 0 if none */ | |
| 510 int track; /**< track number, 0 if none */ | |
| 511 char genre[32]; /**< ID3 genre */ | |
| 512 #endif | |
| 513 | |
| 514 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */ | |
| 515 /* private data for pts handling (do not modify directly). */ | |
| 516 /** This buffer is only needed when packets were already buffered but | |
| 517 not decoded, for example to get the codec parameters in MPEG | |
| 518 streams. */ | |
| 519 struct AVPacketList *packet_buffer; | |
| 520 | |
| 521 /** Decoding: position of the first frame of the component, in | |
| 522 AV_TIME_BASE fractional seconds. NEVER set this value directly: | |
| 523 It is deduced from the AVStream values. */ | |
| 524 int64_t start_time; | |
| 525 /** Decoding: duration of the stream, in AV_TIME_BASE fractional | |
| 526 seconds. NEVER set this value directly: it is deduced from the | |
| 527 AVStream values. */ | |
| 528 int64_t duration; | |
| 529 /** decoding: total file size, 0 if unknown */ | |
| 530 int64_t file_size; | |
| 531 /** Decoding: total stream bitrate in bit/s, 0 if not | |
| 532 available. Never set it directly if the file_size and the | |
| 533 duration are known as FFmpeg can compute it automatically. */ | |
| 534 int bit_rate; | |
| 535 | |
| 536 /* av_read_frame() support */ | |
| 537 AVStream *cur_st; | |
| 538 #if LIBAVFORMAT_VERSION_INT < (53<<16) | |
| 539 const uint8_t *cur_ptr_deprecated; | |
| 540 int cur_len_deprecated; | |
| 541 AVPacket cur_pkt_deprecated; | |
| 542 #endif | |
| 543 | |
| 544 /* av_seek_frame() support */ | |
| 545 int64_t data_offset; /** offset of the first packet */ | |
| 546 int index_built; | |
| 547 | |
| 548 int mux_rate; | |
| 549 int packet_size; | |
| 550 int preload; | |
| 551 int max_delay; | |
| 552 | |
| 553 #define AVFMT_NOOUTPUTLOOP -1 | |
| 554 #define AVFMT_INFINITEOUTPUTLOOP 0 | |
| 555 /** number of times to loop output in formats that support it */ | |
| 556 int loop_output; | |
| 557 | |
| 558 int flags; | |
| 559 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requ
ires parsing future frames. | |
| 560 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index. | |
| 561 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets fr
om input. | |
| 562 | |
| 563 int loop_input; | |
| 564 /** decoding: size of data to probe; encoding: unused. */ | |
| 565 unsigned int probesize; | |
| 566 | |
| 567 /** | |
| 568 * Maximum time (in AV_TIME_BASE units) during which the input should | |
| 569 * be analyzed in av_find_stream_info(). | |
| 570 */ | |
| 571 int max_analyze_duration; | |
| 572 | |
| 573 const uint8_t *key; | |
| 574 int keylen; | |
| 575 | |
| 576 unsigned int nb_programs; | |
| 577 AVProgram **programs; | |
| 578 | |
| 579 /** | |
| 580 * Forced video codec_id. | |
| 581 * Demuxing: Set by user. | |
| 582 */ | |
| 583 enum CodecID video_codec_id; | |
| 584 /** | |
| 585 * Forced audio codec_id. | |
| 586 * Demuxing: Set by user. | |
| 587 */ | |
| 588 enum CodecID audio_codec_id; | |
| 589 /** | |
| 590 * Forced subtitle codec_id. | |
| 591 * Demuxing: Set by user. | |
| 592 */ | |
| 593 enum CodecID subtitle_codec_id; | |
| 594 | |
| 595 /** | |
| 596 * Maximum amount of memory in bytes to use for the index of each stream. | |
| 597 * If the index exceeds this size, entries will be discarded as | |
| 598 * needed to maintain a smaller size. This can lead to slower or less | |
| 599 * accurate seeking (depends on demuxer). | |
| 600 * Demuxers for which a full in-memory index is mandatory will ignore | |
| 601 * this. | |
| 602 * muxing : unused | |
| 603 * demuxing: set by user | |
| 604 */ | |
| 605 unsigned int max_index_size; | |
| 606 | |
| 607 /** | |
| 608 * Maximum amount of memory in bytes to use for buffering frames | |
| 609 * obtained from realtime capture devices. | |
| 610 */ | |
| 611 unsigned int max_picture_buffer; | |
| 612 | |
| 613 unsigned int nb_chapters; | |
| 614 AVChapter **chapters; | |
| 615 | |
| 616 /** | |
| 617 * Flags to enable debugging. | |
| 618 */ | |
| 619 int debug; | |
| 620 #define FF_FDEBUG_TS 0x0001 | |
| 621 | |
| 622 /** | |
| 623 * Raw packets from the demuxer, prior to parsing and decoding. | |
| 624 * This buffer is used for buffering packets until the codec can | |
| 625 * be identified, as parsing cannot be done without knowing the | |
| 626 * codec. | |
| 627 */ | |
| 628 struct AVPacketList *raw_packet_buffer; | |
| 629 struct AVPacketList *raw_packet_buffer_end; | |
| 630 | |
| 631 struct AVPacketList *packet_buffer_end; | |
| 632 | |
| 633 AVMetadata *metadata; | |
| 634 } AVFormatContext; | |
| 635 | |
| 636 typedef struct AVPacketList { | |
| 637 AVPacket pkt; | |
| 638 struct AVPacketList *next; | |
| 639 } AVPacketList; | |
| 640 | |
| 641 #if LIBAVFORMAT_VERSION_INT < (53<<16) | |
| 642 extern AVInputFormat *first_iformat; | |
| 643 extern AVOutputFormat *first_oformat; | |
| 644 #endif | |
| 645 | |
| 646 /** | |
| 647 * If f is NULL, returns the first registered input format, | |
| 648 * if f is non-NULL, returns the next registered input format after f | |
| 649 * or NULL if f is the last one. | |
| 650 */ | |
| 651 AVInputFormat *av_iformat_next(AVInputFormat *f); | |
| 652 | |
| 653 /** | |
| 654 * If f is NULL, returns the first registered output format, | |
| 655 * if f is non-NULL, returns the next registered output format after f | |
| 656 * or NULL if f is the last one. | |
| 657 */ | |
| 658 AVOutputFormat *av_oformat_next(AVOutputFormat *f); | |
| 659 | |
| 660 enum CodecID av_guess_image2_codec(const char *filename); | |
| 661 | |
| 662 /* XXX: Use automatic init with either ELF sections or C file parser */ | |
| 663 /* modules. */ | |
| 664 | |
| 665 /* utils.c */ | |
| 666 void av_register_input_format(AVInputFormat *format); | |
| 667 void av_register_output_format(AVOutputFormat *format); | |
| 668 AVOutputFormat *guess_stream_format(const char *short_name, | |
| 669 const char *filename, | |
| 670 const char *mime_type); | |
| 671 AVOutputFormat *guess_format(const char *short_name, | |
| 672 const char *filename, | |
| 673 const char *mime_type); | |
| 674 | |
| 675 /** | |
| 676 * Guesses the codec ID based upon muxer and filename. | |
| 677 */ | |
| 678 enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name, | |
| 679 const char *filename, const char *mime_type, | |
| 680 enum CodecType type); | |
| 681 | |
| 682 /** | |
| 683 * Send a nice hexadecimal dump of a buffer to the specified file stream. | |
| 684 * | |
| 685 * @param f The file stream pointer where the dump should be sent to. | |
| 686 * @param buf buffer | |
| 687 * @param size buffer size | |
| 688 * | |
| 689 * @see av_hex_dump_log, av_pkt_dump, av_pkt_dump_log | |
| 690 */ | |
| 691 void av_hex_dump(FILE *f, uint8_t *buf, int size); | |
| 692 | |
| 693 /** | |
| 694 * Send a nice hexadecimal dump of a buffer to the log. | |
| 695 * | |
| 696 * @param avcl A pointer to an arbitrary struct of which the first field is a | |
| 697 * pointer to an AVClass struct. | |
| 698 * @param level The importance level of the message, lower values signifying | |
| 699 * higher importance. | |
| 700 * @param buf buffer | |
| 701 * @param size buffer size | |
| 702 * | |
| 703 * @see av_hex_dump, av_pkt_dump, av_pkt_dump_log | |
| 704 */ | |
| 705 void av_hex_dump_log(void *avcl, int level, uint8_t *buf, int size); | |
| 706 | |
| 707 /** | |
| 708 * Send a nice dump of a packet to the specified file stream. | |
| 709 * | |
| 710 * @param f The file stream pointer where the dump should be sent to. | |
| 711 * @param pkt packet to dump | |
| 712 * @param dump_payload True if the payload must be displayed, too. | |
| 713 */ | |
| 714 void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload); | |
| 715 | |
| 716 /** | |
| 717 * Send a nice dump of a packet to the log. | |
| 718 * | |
| 719 * @param avcl A pointer to an arbitrary struct of which the first field is a | |
| 720 * pointer to an AVClass struct. | |
| 721 * @param level The importance level of the message, lower values signifying | |
| 722 * higher importance. | |
| 723 * @param pkt packet to dump | |
| 724 * @param dump_payload True if the payload must be displayed, too. | |
| 725 */ | |
| 726 void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt, int dump_payload); | |
| 727 | |
| 728 /** | |
| 729 * Initialize libavformat and register all the muxers, demuxers and | |
| 730 * protocols. If you do not call this function, then you can select | |
| 731 * exactly which formats you want to support. | |
| 732 * | |
| 733 * @see av_register_input_format() | |
| 734 * @see av_register_output_format() | |
| 735 * @see av_register_protocol() | |
| 736 */ | |
| 737 void av_register_all(void); | |
| 738 | |
| 739 /** codec tag <-> codec id */ | |
| 740 enum CodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int
tag); | |
| 741 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum CodecI
D id); | |
| 742 | |
| 743 /* media file input */ | |
| 744 | |
| 745 /** | |
| 746 * Finds AVInputFormat based on the short name of the input format. | |
| 747 */ | |
| 748 AVInputFormat *av_find_input_format(const char *short_name); | |
| 749 | |
| 750 /** | |
| 751 * Guess file format. | |
| 752 * | |
| 753 * @param is_opened Whether the file is already opened; determines whether | |
| 754 * demuxers with or without AVFMT_NOFILE are probed. | |
| 755 */ | |
| 756 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened); | |
| 757 | |
| 758 /** | |
| 759 * Allocates all the structures needed to read an input stream. | |
| 760 * This does not open the needed codecs for decoding the stream[s]. | |
| 761 */ | |
| 762 int av_open_input_stream(AVFormatContext **ic_ptr, | |
| 763 ByteIOContext *pb, const char *filename, | |
| 764 AVInputFormat *fmt, AVFormatParameters *ap); | |
| 765 | |
| 766 /** | |
| 767 * Open a media file as input. The codecs are not opened. Only the file | |
| 768 * header (if present) is read. | |
| 769 * | |
| 770 * @param ic_ptr The opened media file handle is put here. | |
| 771 * @param filename filename to open | |
| 772 * @param fmt If non-NULL, force the file format to use. | |
| 773 * @param buf_size optional buffer size (zero if default is OK) | |
| 774 * @param ap Additional parameters needed when opening the file | |
| 775 * (NULL if default). | |
| 776 * @return 0 if OK, AVERROR_xxx otherwise | |
| 777 */ | |
| 778 int av_open_input_file(AVFormatContext **ic_ptr, const char *filename, | |
| 779 AVInputFormat *fmt, | |
| 780 int buf_size, | |
| 781 AVFormatParameters *ap); | |
| 782 | |
| 783 #if LIBAVFORMAT_VERSION_MAJOR < 53 | |
| 784 /** | |
| 785 * @deprecated Use avformat_alloc_context() instead. | |
| 786 */ | |
| 787 attribute_deprecated AVFormatContext *av_alloc_format_context(void); | |
| 788 #endif | |
| 789 | |
| 790 /** | |
| 791 * Allocate an AVFormatContext. | |
| 792 * Can be freed with av_free() but do not forget to free everything you | |
| 793 * explicitly allocated as well! | |
| 794 */ | |
| 795 AVFormatContext *avformat_alloc_context(void); | |
| 796 | |
| 797 /** | |
| 798 * Read packets of a media file to get stream information. This | |
| 799 * is useful for file formats with no headers such as MPEG. This | |
| 800 * function also computes the real framerate in case of MPEG-2 repeat | |
| 801 * frame mode. | |
| 802 * The logical file position is not changed by this function; | |
| 803 * examined packets may be buffered for later processing. | |
| 804 * | |
| 805 * @param ic media file handle | |
| 806 * @return >=0 if OK, AVERROR_xxx on error | |
| 807 * @todo Let the user decide somehow what information is needed so that | |
| 808 * we do not waste time getting stuff the user does not need. | |
| 809 */ | |
| 810 int av_find_stream_info(AVFormatContext *ic); | |
| 811 | |
| 812 /** | |
| 813 * Read a transport packet from a media file. | |
| 814 * | |
| 815 * This function is obsolete and should never be used. | |
| 816 * Use av_read_frame() instead. | |
| 817 * | |
| 818 * @param s media file handle | |
| 819 * @param pkt is filled | |
| 820 * @return 0 if OK, AVERROR_xxx on error | |
| 821 */ | |
| 822 int av_read_packet(AVFormatContext *s, AVPacket *pkt); | |
| 823 | |
| 824 /** | |
| 825 * Return the next frame of a stream. | |
| 826 * | |
| 827 * The returned packet is valid | |
| 828 * until the next av_read_frame() or until av_close_input_file() and | |
| 829 * must be freed with av_free_packet. For video, the packet contains | |
| 830 * exactly one frame. For audio, it contains an integer number of | |
| 831 * frames if each frame has a known fixed size (e.g. PCM or ADPCM | |
| 832 * data). If the audio frames have a variable size (e.g. MPEG audio), | |
| 833 * then it contains one frame. | |
| 834 * | |
| 835 * pkt->pts, pkt->dts and pkt->duration are always set to correct | |
| 836 * values in AVStream.time_base units (and guessed if the format cannot | |
| 837 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format | |
| 838 * has B-frames, so it is better to rely on pkt->dts if you do not | |
| 839 * decompress the payload. | |
| 840 * | |
| 841 * @return 0 if OK, < 0 on error or end of file | |
| 842 */ | |
| 843 int av_read_frame(AVFormatContext *s, AVPacket *pkt); | |
| 844 | |
| 845 /** | |
| 846 * Seek to the keyframe at timestamp. | |
| 847 * 'timestamp' in 'stream_index'. | |
| 848 * @param stream_index If stream_index is (-1), a default | |
| 849 * stream is selected, and timestamp is automatically converted | |
| 850 * from AV_TIME_BASE units to the stream specific time_base. | |
| 851 * @param timestamp Timestamp in AVStream.time_base units | |
| 852 * or, if no stream is specified, in AV_TIME_BASE units. | |
| 853 * @param flags flags which select direction and seeking mode | |
| 854 * @return >= 0 on success | |
| 855 */ | |
| 856 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, | |
| 857 int flags); | |
| 858 | |
| 859 /** | |
| 860 * Seek to timestamp ts. | |
| 861 * Seeking will be done so that the point from which all active streams | |
| 862 * can be presented successfully will be closest to ts and within min/max_ts. | |
| 863 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL. | |
| 864 * | |
| 865 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and | |
| 866 * are the file position (this may not be supported by all demuxers). | |
| 867 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames | |
| 868 * in the stream with stream_index (this may not be supported by all demuxers). | |
| 869 * Otherwise all timestamps are in units of the stream selected by stream_index | |
| 870 * or if stream_index is -1, in AV_TIME_BASE units. | |
| 871 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as | |
| 872 * keyframes (this may not be supported by all demuxers). | |
| 873 * | |
| 874 * @param stream_index index of the stream which is used as time base reference | |
| 875 * @param min_ts smallest acceptable timestamp | |
| 876 * @param ts target timestamp | |
| 877 * @param max_ts largest acceptable timestamp | |
| 878 * @param flags flags | |
| 879 * @returns >=0 on success, error code otherwise | |
| 880 * | |
| 881 * @NOTE This is part of the new seek API which is still under construction. | |
| 882 * Thus do not use this yet. It may change at any time, do not expect | |
| 883 * ABI compatibility yet! | |
| 884 */ | |
| 885 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int
64_t ts, int64_t max_ts, int flags); | |
| 886 | |
| 887 /** | |
| 888 * Start playing a network-based stream (e.g. RTSP stream) at the | |
| 889 * current position. | |
| 890 */ | |
| 891 int av_read_play(AVFormatContext *s); | |
| 892 | |
| 893 /** | |
| 894 * Pause a network-based stream (e.g. RTSP stream). | |
| 895 * | |
| 896 * Use av_read_play() to resume it. | |
| 897 */ | |
| 898 int av_read_pause(AVFormatContext *s); | |
| 899 | |
| 900 /** | |
| 901 * Free a AVFormatContext allocated by av_open_input_stream. | |
| 902 * @param s context to free | |
| 903 */ | |
| 904 void av_close_input_stream(AVFormatContext *s); | |
| 905 | |
| 906 /** | |
| 907 * Close a media file (but not its codecs). | |
| 908 * | |
| 909 * @param s media file handle | |
| 910 */ | |
| 911 void av_close_input_file(AVFormatContext *s); | |
| 912 | |
| 913 /** | |
| 914 * Add a new stream to a media file. | |
| 915 * | |
| 916 * Can only be called in the read_header() function. If the flag | |
| 917 * AVFMTCTX_NOHEADER is in the format context, then new streams | |
| 918 * can be added in read_packet too. | |
| 919 * | |
| 920 * @param s media file handle | |
| 921 * @param id file-format-dependent stream ID | |
| 922 */ | |
| 923 AVStream *av_new_stream(AVFormatContext *s, int id); | |
| 924 AVProgram *av_new_program(AVFormatContext *s, int id); | |
| 925 | |
| 926 /** | |
| 927 * Add a new chapter. | |
| 928 * This function is NOT part of the public API | |
| 929 * and should ONLY be used by demuxers. | |
| 930 * | |
| 931 * @param s media file handle | |
| 932 * @param id unique ID for this chapter | |
| 933 * @param start chapter start time in time_base units | |
| 934 * @param end chapter end time in time_base units | |
| 935 * @param title chapter title | |
| 936 * | |
| 937 * @return AVChapter or NULL on error | |
| 938 */ | |
| 939 AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base, | |
| 940 int64_t start, int64_t end, const char *title); | |
| 941 | |
| 942 /** | |
| 943 * Set the pts for a given stream. | |
| 944 * | |
| 945 * @param s stream | |
| 946 * @param pts_wrap_bits number of bits effectively used by the pts | |
| 947 * (used for wrap control, 33 is the value for MPEG) | |
| 948 * @param pts_num numerator to convert to seconds (MPEG: 1) | |
| 949 * @param pts_den denominator to convert to seconds (MPEG: 90000) | |
| 950 */ | |
| 951 void av_set_pts_info(AVStream *s, int pts_wrap_bits, | |
| 952 int pts_num, int pts_den); | |
| 953 | |
| 954 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward | |
| 955 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes | |
| 956 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes | |
| 957 | |
| 958 int av_find_default_stream_index(AVFormatContext *s); | |
| 959 | |
| 960 /** | |
| 961 * Gets the index for a specific timestamp. | |
| 962 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond | |
| 963 * to the timestamp which is <= the requested one, if backward | |
| 964 * is 0, then it will be >= | |
| 965 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise | |
| 966 * @return < 0 if no such timestamp could be found | |
| 967 */ | |
| 968 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags); | |
| 969 | |
| 970 /** | |
| 971 * Ensures the index uses less memory than the maximum specified in | |
| 972 * AVFormatContext.max_index_size by discarding entries if it grows | |
| 973 * too large. | |
| 974 * This function is not part of the public API and should only be called | |
| 975 * by demuxers. | |
| 976 */ | |
| 977 void ff_reduce_index(AVFormatContext *s, int stream_index); | |
| 978 | |
| 979 /** | |
| 980 * Add an index entry into a sorted list. Update the entry if the list | |
| 981 * already contains it. | |
| 982 * | |
| 983 * @param timestamp timestamp in the time base of the given stream | |
| 984 */ | |
| 985 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, | |
| 986 int size, int distance, int flags); | |
| 987 | |
| 988 /** | |
| 989 * Does a binary search using av_index_search_timestamp() and | |
| 990 * AVCodec.read_timestamp(). | |
| 991 * This is not supposed to be called directly by a user application, | |
| 992 * but by demuxers. | |
| 993 * @param target_ts target timestamp in the time base of the given stream | |
| 994 * @param stream_index stream number | |
| 995 */ | |
| 996 int av_seek_frame_binary(AVFormatContext *s, int stream_index, | |
| 997 int64_t target_ts, int flags); | |
| 998 | |
| 999 /** | |
| 1000 * Updates cur_dts of all streams based on the given timestamp and AVStream. | |
| 1001 * | |
| 1002 * Stream ref_st unchanged, others set cur_dts in their native time base. | |
| 1003 * Only needed for timestamp wrapping or if (dts not set and pts!=dts). | |
| 1004 * @param timestamp new dts expressed in time_base of param ref_st | |
| 1005 * @param ref_st reference stream giving time_base of param timestamp | |
| 1006 */ | |
| 1007 void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp); | |
| 1008 | |
| 1009 /** | |
| 1010 * Does a binary search using read_timestamp(). | |
| 1011 * This is not supposed to be called directly by a user application, | |
| 1012 * but by demuxers. | |
| 1013 * @param target_ts target timestamp in the time base of the given stream | |
| 1014 * @param stream_index stream number | |
| 1015 */ | |
| 1016 int64_t av_gen_search(AVFormatContext *s, int stream_index, | |
| 1017 int64_t target_ts, int64_t pos_min, | |
| 1018 int64_t pos_max, int64_t pos_limit, | |
| 1019 int64_t ts_min, int64_t ts_max, | |
| 1020 int flags, int64_t *ts_ret, | |
| 1021 int64_t (*read_timestamp)(struct AVFormatContext *, int ,
int64_t *, int64_t )); | |
| 1022 | |
| 1023 /** media file output */ | |
| 1024 int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap); | |
| 1025 | |
| 1026 /** | |
| 1027 * Allocate the stream private data and write the stream header to an | |
| 1028 * output media file. | |
| 1029 * | |
| 1030 * @param s media file handle | |
| 1031 * @return 0 if OK, AVERROR_xxx on error | |
| 1032 */ | |
| 1033 int av_write_header(AVFormatContext *s); | |
| 1034 | |
| 1035 /** | |
| 1036 * Write a packet to an output media file. | |
| 1037 * | |
| 1038 * The packet shall contain one audio or video frame. | |
| 1039 * The packet must be correctly interleaved according to the container | |
| 1040 * specification, if not then av_interleaved_write_frame must be used. | |
| 1041 * | |
| 1042 * @param s media file handle | |
| 1043 * @param pkt The packet, which contains the stream_index, buf/buf_size, | |
| 1044 dts/pts, ... | |
| 1045 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted | |
| 1046 */ | |
| 1047 int av_write_frame(AVFormatContext *s, AVPacket *pkt); | |
| 1048 | |
| 1049 /** | |
| 1050 * Writes a packet to an output media file ensuring correct interleaving. | |
| 1051 * | |
| 1052 * The packet must contain one audio or video frame. | |
| 1053 * If the packets are already correctly interleaved, the application should | |
| 1054 * call av_write_frame() instead as it is slightly faster. It is also important | |
| 1055 * to keep in mind that completely non-interleaved input will need huge amounts | |
| 1056 * of memory to interleave with this, so it is preferable to interleave at the | |
| 1057 * demuxer level. | |
| 1058 * | |
| 1059 * @param s media file handle | |
| 1060 * @param pkt The packet, which contains the stream_index, buf/buf_size, | |
| 1061 dts/pts, ... | |
| 1062 * @return < 0 on error, = 0 if OK, 1 if end of stream wanted | |
| 1063 */ | |
| 1064 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt); | |
| 1065 | |
| 1066 /** | |
| 1067 * Interleave a packet per dts in an output media file. | |
| 1068 * | |
| 1069 * Packets with pkt->destruct == av_destruct_packet will be freed inside this | |
| 1070 * function, so they cannot be used after it. Note that calling av_free_packet() | |
| 1071 * on them is still safe. | |
| 1072 * | |
| 1073 * @param s media file handle | |
| 1074 * @param out the interleaved packet will be output here | |
| 1075 * @param in the input packet | |
| 1076 * @param flush 1 if no further packets are available as input and all | |
| 1077 * remaining packets should be output | |
| 1078 * @return 1 if a packet was output, 0 if no packet could be output, | |
| 1079 * < 0 if an error occurred | |
| 1080 */ | |
| 1081 int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, | |
| 1082 AVPacket *pkt, int flush); | |
| 1083 | |
| 1084 /** | |
| 1085 * @brief Write the stream trailer to an output media file and | |
| 1086 * free the file private data. | |
| 1087 * | |
| 1088 * May only be called after a successful call to av_write_header. | |
| 1089 * | |
| 1090 * @param s media file handle | |
| 1091 * @return 0 if OK, AVERROR_xxx on error | |
| 1092 */ | |
| 1093 int av_write_trailer(AVFormatContext *s); | |
| 1094 | |
| 1095 void dump_format(AVFormatContext *ic, | |
| 1096 int index, | |
| 1097 const char *url, | |
| 1098 int is_output); | |
| 1099 | |
| 1100 #if LIBAVFORMAT_VERSION_MAJOR < 53 | |
| 1101 /** | |
| 1102 * Parses width and height out of string str. | |
| 1103 * @deprecated Use av_parse_video_frame_size instead. | |
| 1104 */ | |
| 1105 attribute_deprecated int parse_image_size(int *width_ptr, int *height_ptr, | |
| 1106 const char *str); | |
| 1107 | |
| 1108 /** | |
| 1109 * Converts framerate from a string to a fraction. | |
| 1110 * @deprecated Use av_parse_video_frame_rate instead. | |
| 1111 */ | |
| 1112 attribute_deprecated int parse_frame_rate(int *frame_rate, int *frame_rate_base, | |
| 1113 const char *arg); | |
| 1114 #endif | |
| 1115 | |
| 1116 /** | |
| 1117 * Parses \p datestr and returns a corresponding number of microseconds. | |
| 1118 * @param datestr String representing a date or a duration. | |
| 1119 * - If a date the syntax is: | |
| 1120 * @code | |
| 1121 * [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]} | |
| 1122 * @endcode | |
| 1123 * Time is local time unless Z is appended, in which case it is | |
| 1124 * interpreted as UTC. | |
| 1125 * If the year-month-day part is not specified it takes the current | |
| 1126 * year-month-day. | |
| 1127 * Returns the number of microseconds since 1st of January, 1970 up to | |
| 1128 * the time of the parsed date or INT64_MIN if \p datestr cannot be | |
| 1129 * successfully parsed. | |
| 1130 * - If a duration the syntax is: | |
| 1131 * @code | |
| 1132 * [-]HH[:MM[:SS[.m...]]] | |
| 1133 * [-]S+[.m...] | |
| 1134 * @endcode | |
| 1135 * Returns the number of microseconds contained in a time interval | |
| 1136 * with the specified duration or INT64_MIN if \p datestr cannot be | |
| 1137 * successfully parsed. | |
| 1138 * @param duration Flag which tells how to interpret \p datestr, if | |
| 1139 * not zero \p datestr is interpreted as a duration, otherwise as a | |
| 1140 * date. | |
| 1141 */ | |
| 1142 int64_t parse_date(const char *datestr, int duration); | |
| 1143 | |
| 1144 /** Gets the current time in microseconds. */ | |
| 1145 int64_t av_gettime(void); | |
| 1146 | |
| 1147 /* ffm-specific for ffserver */ | |
| 1148 #define FFM_PACKET_SIZE 4096 | |
| 1149 int64_t ffm_read_write_index(int fd); | |
| 1150 int ffm_write_write_index(int fd, int64_t pos); | |
| 1151 void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size); | |
| 1152 | |
| 1153 /** | |
| 1154 * Attempts to find a specific tag in a URL. | |
| 1155 * | |
| 1156 * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done. | |
| 1157 * Return 1 if found. | |
| 1158 */ | |
| 1159 int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info); | |
| 1160 | |
| 1161 /** | |
| 1162 * Returns in 'buf' the path with '%d' replaced by a number. | |
| 1163 * | |
| 1164 * Also handles the '%0nd' format where 'n' is the total number | |
| 1165 * of digits and '%%'. | |
| 1166 * | |
| 1167 * @param buf destination buffer | |
| 1168 * @param buf_size destination buffer size | |
| 1169 * @param path numbered sequence string | |
| 1170 * @param number frame number | |
| 1171 * @return 0 if OK, -1 on format error | |
| 1172 */ | |
| 1173 int av_get_frame_filename(char *buf, int buf_size, | |
| 1174 const char *path, int number); | |
| 1175 | |
| 1176 /** | |
| 1177 * Check whether filename actually is a numbered sequence generator. | |
| 1178 * | |
| 1179 * @param filename possible numbered sequence string | |
| 1180 * @return 1 if a valid numbered sequence string, 0 otherwise | |
| 1181 */ | |
| 1182 int av_filename_number_test(const char *filename); | |
| 1183 | |
| 1184 /** | |
| 1185 * Generate an SDP for an RTP session. | |
| 1186 * | |
| 1187 * @param ac array of AVFormatContexts describing the RTP streams. If the | |
| 1188 * array is composed by only one context, such context can contain | |
| 1189 * multiple AVStreams (one AVStream per RTP stream). Otherwise, | |
| 1190 * all the contexts in the array (an AVCodecContext per RTP stream) | |
| 1191 * must contain only one AVStream. | |
| 1192 * @param n_files number of AVCodecContexts contained in ac | |
| 1193 * @param buff buffer where the SDP will be stored (must be allocated by | |
| 1194 * the caller) | |
| 1195 * @param size the size of the buffer | |
| 1196 * @return 0 if OK, AVERROR_xxx on error | |
| 1197 */ | |
| 1198 int avf_sdp_create(AVFormatContext *ac[], int n_files, char *buff, int size); | |
| 1199 | |
| 1200 #ifdef HAVE_AV_CONFIG_H | |
| 1201 | |
| 1202 void ff_dynarray_add(intptr_t **tab_ptr, int *nb_ptr, intptr_t elem); | |
| 1203 | |
| 1204 #ifdef __GNUC__ | |
| 1205 #define dynarray_add(tab, nb_ptr, elem)\ | |
| 1206 do {\ | |
| 1207 __typeof__(tab) _tab = (tab);\ | |
| 1208 __typeof__(elem) _elem = (elem);\ | |
| 1209 (void)sizeof(**_tab == _elem); /* check that types are compatible */\ | |
| 1210 ff_dynarray_add((intptr_t **)_tab, nb_ptr, (intptr_t)_elem);\ | |
| 1211 } while(0) | |
| 1212 #else | |
| 1213 #define dynarray_add(tab, nb_ptr, elem)\ | |
| 1214 do {\ | |
| 1215 ff_dynarray_add((intptr_t **)(tab), nb_ptr, (intptr_t)(elem));\ | |
| 1216 } while(0) | |
| 1217 #endif | |
| 1218 | |
| 1219 time_t mktimegm(struct tm *tm); | |
| 1220 struct tm *brktimegm(time_t secs, struct tm *tm); | |
| 1221 const char *small_strptime(const char *p, const char *fmt, | |
| 1222 struct tm *dt); | |
| 1223 | |
| 1224 struct in_addr; | |
| 1225 int resolve_host(struct in_addr *sin_addr, const char *hostname); | |
| 1226 | |
| 1227 void url_split(char *proto, int proto_size, | |
| 1228 char *authorization, int authorization_size, | |
| 1229 char *hostname, int hostname_size, | |
| 1230 int *port_ptr, | |
| 1231 char *path, int path_size, | |
| 1232 const char *url); | |
| 1233 | |
| 1234 int match_ext(const char *filename, const char *extensions); | |
| 1235 | |
| 1236 #endif /* HAVE_AV_CONFIG_H */ | |
| 1237 | |
| 1238 #endif /* AVFORMAT_AVFORMAT_H */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 909002:
Removed custom FFmpegLock. Removed ffmpeg headers from third_party/ffmpeg/include. (Closed)
