| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * This file is part of FFmpeg. | ||
| 3 | * | ||
| 4 | * FFmpeg is free software; you can redistribute it and/or | ||
| 5 | * modify it under the terms of the GNU Lesser General Public | ||
| 6 | * License as published by the Free Software Foundation; either | ||
| 7 | * version 2.1 of the License, or (at your option) any later version. | ||
| 8 | * | ||
| 9 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 12 | * Lesser General Public License for more details. | ||
| 13 | * | ||
| 14 | * You should have received a copy of the GNU Lesser General Public | ||
| 15 | * License along with FFmpeg; if not, write to the Free Software | ||
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 17 | */ | ||
| 18 | |||
| 19 | /** | ||
| 20 | * @file | ||
| 21 | * unbuffered private I/O API | ||
| 22 | */ | ||
| 23 | |||
| 24 | #ifndef AVFORMAT_URL_H | ||
| 25 | #define AVFORMAT_URL_H | ||
| 26 | |||
| 27 | #include "avio.h" | ||
| 28 | |||
| 29 | #include "libavutil/dict.h" | ||
| 30 | #include "libavutil/log.h" | ||
| 31 | |||
| 32 | #define URL_PROTOCOL_FLAG_NESTED_SCHEME 1 /*< The protocol name can be the first part of a nested protocol scheme */ | ||
| 33 | #define URL_PROTOCOL_FLAG_NETWORK 2 /*< The protocol uses network */ | ||
| 34 | |||
| 35 | typedef struct URLContext { | ||
| 36 | const AVClass *av_class; /**< information for av_log(). Set by url_open(). */ | ||
| 37 | const struct URLProtocol *prot; | ||
| 38 | void *priv_data; | ||
| 39 | char *filename; /**< specified URL */ | ||
| 40 | int flags; | ||
| 41 | int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */ | ||
| 42 | int is_streamed; /**< true if streamed (no seek possible), default = false */ | ||
| 43 | int is_connected; | ||
| 44 | AVIOInterruptCB interrupt_callback; | ||
| 45 | int64_t rw_timeout; /**< maximum time to wait for (network) read/write operation completion, in mcs */ | ||
| 46 | const char *protocol_whitelist; | ||
| 47 | const char *protocol_blacklist; | ||
| 48 | int min_packet_size; /**< if non zero, the stream is packetized with this min packet size */ | ||
| 49 | } URLContext; | ||
| 50 | |||
| 51 | typedef struct URLProtocol { | ||
| 52 | const char *name; | ||
| 53 | int (*url_open)( URLContext *h, const char *url, int flags); | ||
| 54 | /** | ||
| 55 | * This callback is to be used by protocols which open further nested | ||
| 56 | * protocols. options are then to be passed to ffurl_open_whitelist() | ||
| 57 | * or ffurl_connect() for those nested protocols. | ||
| 58 | */ | ||
| 59 | int (*url_open2)(URLContext *h, const char *url, int flags, AVDictionary **options); | ||
| 60 | int (*url_accept)(URLContext *s, URLContext **c); | ||
| 61 | int (*url_handshake)(URLContext *c); | ||
| 62 | |||
| 63 | /** | ||
| 64 | * Read data from the protocol. | ||
| 65 | * If data is immediately available (even less than size), EOF is | ||
| 66 | * reached or an error occurs (including EINTR), return immediately. | ||
| 67 | * Otherwise: | ||
| 68 | * In non-blocking mode, return AVERROR(EAGAIN) immediately. | ||
| 69 | * In blocking mode, wait for data/EOF/error with a short timeout (0.1s), | ||
| 70 | * and return AVERROR(EAGAIN) on timeout. | ||
| 71 | * Checking interrupt_callback, looping on EINTR and EAGAIN and until | ||
| 72 | * enough data has been read is left to the calling function; see | ||
| 73 | * retry_transfer_wrapper in avio.c. | ||
| 74 | */ | ||
| 75 | int (*url_read)( URLContext *h, unsigned char *buf, int size); | ||
| 76 | int (*url_write)(URLContext *h, const unsigned char *buf, int size); | ||
| 77 | int64_t (*url_seek)( URLContext *h, int64_t pos, int whence); | ||
| 78 | int (*url_close)(URLContext *h); | ||
| 79 | int (*url_read_pause)(void *urlcontext, int pause); | ||
| 80 | int64_t (*url_read_seek)(void *urlcontext, int stream_index, | ||
| 81 | int64_t timestamp, int flags); | ||
| 82 | int (*url_get_file_handle)(URLContext *h); | ||
| 83 | int (*url_get_multi_file_handle)(URLContext *h, int **handles, | ||
| 84 | int *numhandles); | ||
| 85 | int (*url_get_short_seek)(URLContext *h); | ||
| 86 | int (*url_shutdown)(URLContext *h, int flags); | ||
| 87 | const AVClass *priv_data_class; | ||
| 88 | int priv_data_size; | ||
| 89 | int flags; | ||
| 90 | int (*url_check)(URLContext *h, int mask); | ||
| 91 | int (*url_open_dir)(URLContext *h); | ||
| 92 | int (*url_read_dir)(URLContext *h, AVIODirEntry **next); | ||
| 93 | int (*url_close_dir)(URLContext *h); | ||
| 94 | int (*url_delete)(URLContext *h); | ||
| 95 | int (*url_move)(URLContext *h_src, URLContext *h_dst); | ||
| 96 | const char *default_whitelist; | ||
| 97 | } URLProtocol; | ||
| 98 | |||
| 99 | /** | ||
| 100 | * Create a URLContext for accessing to the resource indicated by | ||
| 101 | * url, but do not initiate the connection yet. | ||
| 102 | * | ||
| 103 | * @param puc pointer to the location where, in case of success, the | ||
| 104 | * function puts the pointer to the created URLContext | ||
| 105 | * @param flags flags which control how the resource indicated by url | ||
| 106 | * is to be opened | ||
| 107 | * @param int_cb interrupt callback to use for the URLContext, may be | ||
| 108 | * NULL | ||
| 109 | * @return >= 0 in case of success, a negative value corresponding to an | ||
| 110 | * AVERROR code in case of failure | ||
| 111 | */ | ||
| 112 | int ffurl_alloc(URLContext **puc, const char *filename, int flags, | ||
| 113 | const AVIOInterruptCB *int_cb); | ||
| 114 | |||
| 115 | /** | ||
| 116 | * Connect an URLContext that has been allocated by ffurl_alloc | ||
| 117 | * | ||
| 118 | * @param options A dictionary filled with options for nested protocols, | ||
| 119 | * i.e. it will be passed to url_open2() for protocols implementing it. | ||
| 120 | * This parameter will be destroyed and replaced with a dict containing options | ||
| 121 | * that were not found. May be NULL. | ||
| 122 | */ | ||
| 123 | int ffurl_connect(URLContext *uc, AVDictionary **options); | ||
| 124 | |||
| 125 | /** | ||
| 126 | * Create an URLContext for accessing to the resource indicated by | ||
| 127 | * url, and open it. | ||
| 128 | * | ||
| 129 | * @param puc pointer to the location where, in case of success, the | ||
| 130 | * function puts the pointer to the created URLContext | ||
| 131 | * @param flags flags which control how the resource indicated by url | ||
| 132 | * is to be opened | ||
| 133 | * @param int_cb interrupt callback to use for the URLContext, may be | ||
| 134 | * NULL | ||
| 135 | * @param options A dictionary filled with protocol-private options. On return | ||
| 136 | * this parameter will be destroyed and replaced with a dict containing options | ||
| 137 | * that were not found. May be NULL. | ||
| 138 | * @param parent An enclosing URLContext, whose generic options should | ||
| 139 | * be applied to this URLContext as well. | ||
| 140 | * @return >= 0 in case of success, a negative value corresponding to an | ||
| 141 | * AVERROR code in case of failure | ||
| 142 | */ | ||
| 143 | int ffurl_open_whitelist(URLContext **puc, const char *filename, int flags, | ||
| 144 | const AVIOInterruptCB *int_cb, AVDictionary **options, | ||
| 145 | const char *whitelist, const char* blacklist, | ||
| 146 | URLContext *parent); | ||
| 147 | |||
| 148 | /** | ||
| 149 | * Accept an URLContext c on an URLContext s | ||
| 150 | * | ||
| 151 | * @param s server context | ||
| 152 | * @param c client context, must be unallocated. | ||
| 153 | * @return >= 0 on success, ff_neterrno() on failure. | ||
| 154 | */ | ||
| 155 | int ffurl_accept(URLContext *s, URLContext **c); | ||
| 156 | |||
| 157 | /** | ||
| 158 | * Perform one step of the protocol handshake to accept a new client. | ||
| 159 | * See avio_handshake() for details. | ||
| 160 | * Implementations should try to return decreasing values. | ||
| 161 | * If the protocol uses an underlying protocol, the underlying handshake is | ||
| 162 | * usually the first step, and the return value can be: | ||
| 163 | * (largest value for this protocol) + (return value from other protocol) | ||
| 164 | * | ||
| 165 | * @param c the client context | ||
| 166 | * @return >= 0 on success or a negative value corresponding | ||
| 167 | * to an AVERROR code on failure | ||
| 168 | */ | ||
| 169 | int ffurl_handshake(URLContext *c); | ||
| 170 | |||
| 171 | int ffurl_read2(void *urlcontext, uint8_t *buf, int size); | ||
| 172 | /** | ||
| 173 | * Read up to size bytes from the resource accessed by h, and store | ||
| 174 | * the read bytes in buf. | ||
| 175 | * | ||
| 176 | * @return The number of bytes actually read, or a negative value | ||
| 177 | * corresponding to an AVERROR code in case of error. A value of zero | ||
| 178 | * indicates that it is not possible to read more from the accessed | ||
| 179 | * resource (except if the value of the size argument is also zero). | ||
| 180 | */ | ||
| 181 | 49 | static inline int ffurl_read(URLContext *h, uint8_t *buf, int size) | |
| 182 | { | ||
| 183 | 49 | return ffurl_read2(h, buf, size); | |
| 184 | } | ||
| 185 | |||
| 186 | /** | ||
| 187 | * Read as many bytes as possible (up to size), calling the | ||
| 188 | * read function multiple times if necessary. | ||
| 189 | * This makes special short-read handling in applications | ||
| 190 | * unnecessary, if the return value is < size then it is | ||
| 191 | * certain there was either an error or the end of file was reached. | ||
| 192 | */ | ||
| 193 | int ffurl_read_complete(URLContext *h, unsigned char *buf, int size); | ||
| 194 | |||
| 195 | int ffurl_write2(void *urlcontext, const uint8_t *buf, int size); | ||
| 196 | /** | ||
| 197 | * Write size bytes from buf to the resource accessed by h. | ||
| 198 | * | ||
| 199 | * @return the number of bytes actually written, or a negative value | ||
| 200 | * corresponding to an AVERROR code in case of failure | ||
| 201 | */ | ||
| 202 | 384 | static inline int ffurl_write(URLContext *h, const uint8_t *buf, int size) | |
| 203 | { | ||
| 204 | 384 | return ffurl_write2(h, buf, size); | |
| 205 | } | ||
| 206 | |||
| 207 | int64_t ffurl_seek2(void *urlcontext, int64_t pos, int whence); | ||
| 208 | /** | ||
| 209 | * Change the position that will be used by the next read/write | ||
| 210 | * operation on the resource accessed by h. | ||
| 211 | * | ||
| 212 | * @param pos specifies the new position to set | ||
| 213 | * @param whence specifies how pos should be interpreted, it must be | ||
| 214 | * one of SEEK_SET (seek from the beginning), SEEK_CUR (seek from the | ||
| 215 | * current position), SEEK_END (seek from the end), or AVSEEK_SIZE | ||
| 216 | * (return the filesize of the requested resource, pos is ignored). | ||
| 217 | * @return a negative value corresponding to an AVERROR code in case | ||
| 218 | * of failure, or the resulting file position, measured in bytes from | ||
| 219 | * the beginning of the file. You can use this feature together with | ||
| 220 | * SEEK_CUR to read the current file position. | ||
| 221 | */ | ||
| 222 | 109893 | static inline int64_t ffurl_seek(URLContext *h, int64_t pos, int whence) | |
| 223 | { | ||
| 224 | 109893 | return ffurl_seek2(h, pos, whence); | |
| 225 | } | ||
| 226 | |||
| 227 | /** | ||
| 228 | * Close the resource accessed by the URLContext h, and free the | ||
| 229 | * memory used by it. Also set the URLContext pointer to NULL. | ||
| 230 | * | ||
| 231 | * @return a negative value if an error condition occurred, 0 | ||
| 232 | * otherwise | ||
| 233 | */ | ||
| 234 | int ffurl_closep(URLContext **h); | ||
| 235 | int ffurl_close(URLContext *h); | ||
| 236 | |||
| 237 | /** | ||
| 238 | * Return the filesize of the resource accessed by h, AVERROR(ENOSYS) | ||
| 239 | * if the operation is not supported by h, or another negative value | ||
| 240 | * corresponding to an AVERROR error code in case of failure. | ||
| 241 | */ | ||
| 242 | int64_t ffurl_size(URLContext *h); | ||
| 243 | |||
| 244 | /** | ||
| 245 | * Return the file descriptor associated with this URL. For RTP, this | ||
| 246 | * will return only the RTP file descriptor, not the RTCP file descriptor. | ||
| 247 | * | ||
| 248 | * @return the file descriptor associated with this URL, or <0 on error. | ||
| 249 | */ | ||
| 250 | int ffurl_get_file_handle(URLContext *h); | ||
| 251 | |||
| 252 | /** | ||
| 253 | * Return the file descriptors associated with this URL. | ||
| 254 | * | ||
| 255 | * @return 0 on success or <0 on error. | ||
| 256 | */ | ||
| 257 | int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles); | ||
| 258 | |||
| 259 | /** | ||
| 260 | * Return the current short seek threshold value for this URL. | ||
| 261 | * | ||
| 262 | * @return threshold (>0) on success or <=0 on error. | ||
| 263 | */ | ||
| 264 | int ffurl_get_short_seek(void *urlcontext); | ||
| 265 | |||
| 266 | /** | ||
| 267 | * Signal the URLContext that we are done reading or writing the stream. | ||
| 268 | * | ||
| 269 | * @param h pointer to the resource | ||
| 270 | * @param flags flags which control how the resource indicated by url | ||
| 271 | * is to be shutdown | ||
| 272 | * | ||
| 273 | * @return a negative value if an error condition occurred, 0 | ||
| 274 | * otherwise | ||
| 275 | */ | ||
| 276 | int ffurl_shutdown(URLContext *h, int flags); | ||
| 277 | |||
| 278 | /** | ||
| 279 | * Check if the user has requested to interrupt a blocking function | ||
| 280 | * associated with cb. | ||
| 281 | */ | ||
| 282 | int ff_check_interrupt(AVIOInterruptCB *cb); | ||
| 283 | |||
| 284 | /* udp.c */ | ||
| 285 | int ff_udp_set_remote_url(URLContext *h, const char *uri); | ||
| 286 | int ff_udp_get_local_port(URLContext *h); | ||
| 287 | |||
| 288 | /** | ||
| 289 | * Assemble a URL string from components. This is the reverse operation | ||
| 290 | * of av_url_split. | ||
| 291 | * | ||
| 292 | * Note, this requires networking to be initialized, so the caller must | ||
| 293 | * ensure ff_network_init has been called. | ||
| 294 | * | ||
| 295 | * @see av_url_split | ||
| 296 | * | ||
| 297 | * @param str the buffer to fill with the url | ||
| 298 | * @param size the size of the str buffer | ||
| 299 | * @param proto the protocol identifier, if null, the separator | ||
| 300 | * after the identifier is left out, too | ||
| 301 | * @param authorization an optional authorization string, may be null. | ||
| 302 | * An empty string is treated the same as a null string. | ||
| 303 | * @param hostname the host name string | ||
| 304 | * @param port the port number, left out from the string if negative | ||
| 305 | * @param fmt a generic format string for everything to add after the | ||
| 306 | * host/port, may be null | ||
| 307 | * @return the number of characters written to the destination buffer | ||
| 308 | */ | ||
| 309 | int ff_url_join(char *str, int size, const char *proto, | ||
| 310 | const char *authorization, const char *hostname, | ||
| 311 | int port, const char *fmt, ...) av_printf_format(7, 8); | ||
| 312 | |||
| 313 | /** | ||
| 314 | * Convert a relative url into an absolute url, given a base url. | ||
| 315 | * | ||
| 316 | * @param buf the buffer where output absolute url is written | ||
| 317 | * @param size the size of buf | ||
| 318 | * @param base the base url, may be equal to buf. | ||
| 319 | * @param rel the new url, which is interpreted relative to base | ||
| 320 | * @param handle_dos_paths handle DOS paths for file or unspecified protocol | ||
| 321 | */ | ||
| 322 | int ff_make_absolute_url2(char *buf, int size, const char *base, | ||
| 323 | const char *rel, int handle_dos_paths); | ||
| 324 | |||
| 325 | /** | ||
| 326 | * Convert a relative url into an absolute url, given a base url. | ||
| 327 | * | ||
| 328 | * Same as ff_make_absolute_url2 with handle_dos_paths being equal to | ||
| 329 | * HAVE_DOS_PATHS config variable. | ||
| 330 | */ | ||
| 331 | int ff_make_absolute_url(char *buf, int size, const char *base, | ||
| 332 | const char *rel); | ||
| 333 | |||
| 334 | /** | ||
| 335 | * Allocate directory entry with default values. | ||
| 336 | * | ||
| 337 | * @return entry or NULL on error | ||
| 338 | */ | ||
| 339 | AVIODirEntry *ff_alloc_dir_entry(void); | ||
| 340 | |||
| 341 | const AVClass *ff_urlcontext_child_class_iterate(void **iter); | ||
| 342 | |||
| 343 | /** | ||
| 344 | * Construct a list of protocols matching a given whitelist and/or blacklist. | ||
| 345 | * | ||
| 346 | * @param whitelist a comma-separated list of allowed protocol names or NULL. If | ||
| 347 | * this is a non-empty string, only protocols in this list will | ||
| 348 | * be included. | ||
| 349 | * @param blacklist a comma-separated list of forbidden protocol names or NULL. | ||
| 350 | * If this is a non-empty string, all protocols in this list | ||
| 351 | * will be excluded. | ||
| 352 | * | ||
| 353 | * @return a NULL-terminated array of matching protocols. The array must be | ||
| 354 | * freed by the caller. | ||
| 355 | */ | ||
| 356 | const URLProtocol **ffurl_get_protocols(const char *whitelist, | ||
| 357 | const char *blacklist); | ||
| 358 | |||
| 359 | typedef struct URLComponents { | ||
| 360 | const char *url; /**< whole URL, for reference */ | ||
| 361 | const char *scheme; /**< possibly including lavf-specific options */ | ||
| 362 | const char *authority; /**< "//" if it is a real URL */ | ||
| 363 | const char *userinfo; /**< including final '@' if present */ | ||
| 364 | const char *host; | ||
| 365 | const char *port; /**< including initial ':' if present */ | ||
| 366 | const char *path; | ||
| 367 | const char *query; /**< including initial '?' if present */ | ||
| 368 | const char *fragment; /**< including initial '#' if present */ | ||
| 369 | const char *end; | ||
| 370 | } URLComponents; | ||
| 371 | |||
| 372 | #define url_component_end_scheme authority | ||
| 373 | #define url_component_end_authority userinfo | ||
| 374 | #define url_component_end_userinfo host | ||
| 375 | #define url_component_end_host port | ||
| 376 | #define url_component_end_port path | ||
| 377 | #define url_component_end_path query | ||
| 378 | #define url_component_end_query fragment | ||
| 379 | #define url_component_end_fragment end | ||
| 380 | #define url_component_end_authority_full path | ||
| 381 | |||
| 382 | #define URL_COMPONENT_HAVE(uc, component) \ | ||
| 383 | ((uc).url_component_end_##component > (uc).component) | ||
| 384 | |||
| 385 | /** | ||
| 386 | * Parse an URL to find the components. | ||
| 387 | * | ||
| 388 | * Each component runs until the start of the next component, | ||
| 389 | * possibly including a mandatory delimiter. | ||
| 390 | * | ||
| 391 | * @param uc structure to fill with pointers to the components. | ||
| 392 | * @param url URL to parse. | ||
| 393 | * @param end end of the URL, or NULL to parse to the end of string. | ||
| 394 | * | ||
| 395 | * @return >= 0 for success or an AVERROR code, especially if the URL is | ||
| 396 | * malformed. | ||
| 397 | */ | ||
| 398 | int ff_url_decompose(URLComponents *uc, const char *url, const char *end); | ||
| 399 | |||
| 400 | /** | ||
| 401 | * Move or rename a resource. | ||
| 402 | * | ||
| 403 | * @note url_src and url_dst should share the same protocol and authority. | ||
| 404 | * | ||
| 405 | * @param url_src url to resource to be moved | ||
| 406 | * @param url_dst new url to resource if the operation succeeded | ||
| 407 | * @return >=0 on success or negative on error. | ||
| 408 | */ | ||
| 409 | int ffurl_move(const char *url_src, const char *url_dst); | ||
| 410 | |||
| 411 | /** | ||
| 412 | * Delete a resource. | ||
| 413 | * | ||
| 414 | * @param url resource to be deleted. | ||
| 415 | * @return >=0 on success or negative on error. | ||
| 416 | */ | ||
| 417 | int ffurl_delete(const char *url); | ||
| 418 | |||
| 419 | #endif /* AVFORMAT_URL_H */ | ||
| 420 |