3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/avstring.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/time.h"
26 #include "os_support.h"
33 static URLProtocol *first_protocol = NULL;
35 URLProtocol *ffurl_protocol_next(const URLProtocol *prev)
37 return prev ? prev->next : first_protocol;
40 /** @name Logging context. */
42 static const char *urlcontext_to_name(void *ptr)
44 URLContext *h = (URLContext *)ptr;
51 static void *urlcontext_child_next(void *obj, void *prev)
54 if (!prev && h->priv_data && h->prot->priv_data_class)
59 static const AVClass *urlcontext_child_class_next(const AVClass *prev)
61 URLProtocol *p = NULL;
63 /* find the protocol that corresponds to prev */
64 while (prev && (p = ffurl_protocol_next(p)))
65 if (p->priv_data_class == prev)
68 /* find next protocol with priv options */
69 while (p = ffurl_protocol_next(p))
70 if (p->priv_data_class)
71 return p->priv_data_class;
75 static const AVOption options[] = { { NULL } };
76 const AVClass ffurl_context_class = {
77 .class_name = "URLContext",
78 .item_name = urlcontext_to_name,
80 .version = LIBAVUTIL_VERSION_INT,
81 .child_next = urlcontext_child_next,
82 .child_class_next = urlcontext_child_class_next,
86 const char *avio_enum_protocols(void **opaque, int output)
89 *opaque = ffurl_protocol_next(*opaque);
92 if ((output && p->url_write) || (!output && p->url_read))
94 return avio_enum_protocols(opaque, output);
97 int ffurl_register_protocol(URLProtocol *protocol)
104 protocol->next = NULL;
108 int ffurl_deregister_protocol(URLProtocol *protocol)
115 if(!strcmp((*p)->name, protocol->name)) {
125 static int url_alloc_for_protocol(URLContext **puc, struct URLProtocol *up,
126 const char *filename, int flags,
127 const AVIOInterruptCB *int_cb)
133 if (up->flags & URL_PROTOCOL_FLAG_NETWORK && !ff_network_init())
136 uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1);
138 err = AVERROR(ENOMEM);
141 uc->av_class = &ffurl_context_class;
142 uc->filename = (char *)&uc[1];
143 strcpy(uc->filename, filename);
146 uc->is_streamed = 0; /* default = not streamed */
147 uc->max_packet_size = 0; /* default: stream file */
148 if (up->priv_data_size) {
149 uc->priv_data = av_mallocz(up->priv_data_size);
150 if (!uc->priv_data) {
151 err = AVERROR(ENOMEM);
154 if (up->priv_data_class) {
155 *(const AVClass **)uc->priv_data = up->priv_data_class;
156 av_opt_set_defaults(uc->priv_data);
160 uc->interrupt_callback = *int_cb;
167 av_freep(&uc->priv_data);
170 if (up->flags & URL_PROTOCOL_FLAG_NETWORK)
176 int ffurl_connect(URLContext *uc, AVDictionary **options)
179 uc->prot->url_open2 ? uc->prot->url_open2(uc,
183 uc->prot->url_open(uc, uc->filename, uc->flags);
186 uc->is_connected = 1;
187 /* We must be careful here as ffurl_seek() could be slow,
188 * for example for http */
189 if ((uc->flags & AVIO_FLAG_WRITE) || !strcmp(uc->prot->name, "file"))
190 if (!uc->is_streamed && ffurl_seek(uc, 0, SEEK_SET) < 0)
195 #define URL_SCHEME_CHARS \
196 "abcdefghijklmnopqrstuvwxyz" \
197 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
200 int ffurl_alloc(URLContext **puc, const char *filename, int flags,
201 const AVIOInterruptCB *int_cb)
203 URLProtocol *up = NULL;
204 char proto_str[128], proto_nested[128], *ptr;
205 size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
207 if (filename[proto_len] != ':' || is_dos_path(filename))
208 strcpy(proto_str, "file");
210 av_strlcpy(proto_str, filename,
211 FFMIN(proto_len + 1, sizeof(proto_str)));
213 av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
214 if ((ptr = strchr(proto_nested, '+')))
217 while (up = ffurl_protocol_next(up)) {
218 if (!strcmp(proto_str, up->name))
219 return url_alloc_for_protocol(puc, up, filename, flags, int_cb);
220 if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
221 !strcmp(proto_nested, up->name))
222 return url_alloc_for_protocol(puc, up, filename, flags, int_cb);
225 return AVERROR_PROTOCOL_NOT_FOUND;
228 int ffurl_open(URLContext **puc, const char *filename, int flags,
229 const AVIOInterruptCB *int_cb, AVDictionary **options)
231 int ret = ffurl_alloc(puc, filename, flags, int_cb);
234 if (options && (*puc)->prot->priv_data_class &&
235 (ret = av_opt_set_dict((*puc)->priv_data, options)) < 0)
237 ret = ffurl_connect(*puc, options);
246 static inline int retry_transfer_wrapper(URLContext *h, uint8_t *buf,
247 int size, int size_min,
248 int (*transfer_func)(URLContext *h,
253 int fast_retries = 5;
256 while (len < size_min) {
257 ret = transfer_func(h, buf + len, size - len);
258 if (ret == AVERROR(EINTR))
260 if (h->flags & AVIO_FLAG_NONBLOCK)
262 if (ret == AVERROR(EAGAIN)) {
269 return (ret < 0 && ret != AVERROR_EOF) ? ret : len;
271 fast_retries = FFMAX(fast_retries, 2);
273 if (ff_check_interrupt(&h->interrupt_callback))
279 int ffurl_read(URLContext *h, unsigned char *buf, int size)
281 if (!(h->flags & AVIO_FLAG_READ))
283 return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
286 int ffurl_read_complete(URLContext *h, unsigned char *buf, int size)
288 if (!(h->flags & AVIO_FLAG_READ))
290 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
293 int ffurl_write(URLContext *h, const unsigned char *buf, int size)
295 if (!(h->flags & AVIO_FLAG_WRITE))
297 /* avoid sending too big packets */
298 if (h->max_packet_size && size > h->max_packet_size)
301 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_write);
304 int64_t ffurl_seek(URLContext *h, int64_t pos, int whence)
308 if (!h->prot->url_seek)
309 return AVERROR(ENOSYS);
310 ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
314 int ffurl_close(URLContext *h)
318 return 0; /* can happen when ffurl_open fails */
320 if (h->is_connected && h->prot->url_close)
321 ret = h->prot->url_close(h);
323 if (h->prot->flags & URL_PROTOCOL_FLAG_NETWORK)
326 if (h->prot->priv_data_size) {
327 if (h->prot->priv_data_class)
328 av_opt_free(h->priv_data);
329 av_free(h->priv_data);
335 int avio_check(const char *url, int flags)
338 int ret = ffurl_alloc(&h, url, flags, NULL);
342 if (h->prot->url_check) {
343 ret = h->prot->url_check(h, flags);
345 ret = ffurl_connect(h, NULL);
354 int64_t ffurl_size(URLContext *h)
358 size = ffurl_seek(h, 0, AVSEEK_SIZE);
360 pos = ffurl_seek(h, 0, SEEK_CUR);
361 if ((size = ffurl_seek(h, -1, SEEK_END)) < 0)
364 ffurl_seek(h, pos, SEEK_SET);
369 int ffurl_get_file_handle(URLContext *h)
371 if (!h->prot->url_get_file_handle)
373 return h->prot->url_get_file_handle(h);
376 int ffurl_get_multi_file_handle(URLContext *h, int **handles, int *numhandles)
378 if (!h->prot->url_get_multi_file_handle) {
379 if (!h->prot->url_get_file_handle)
380 return AVERROR(ENOSYS);
381 *handles = av_malloc(sizeof(**handles));
383 return AVERROR(ENOMEM);
385 *handles[0] = h->prot->url_get_file_handle(h);
388 return h->prot->url_get_multi_file_handle(h, handles, numhandles);
391 int ffurl_shutdown(URLContext *h, int flags)
393 if (!h->prot->url_shutdown)
394 return AVERROR(EINVAL);
395 return h->prot->url_shutdown(h, flags);
398 int ff_check_interrupt(AVIOInterruptCB *cb)
401 if (cb && cb->callback && (ret = cb->callback(cb->opaque)))