2 * Unbuffered io for ffmpeg system
3 * Copyright (c) 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 /* needed for usleep() */
23 #define _XOPEN_SOURCE 600
25 #include "libavutil/avstring.h"
26 #include "libavutil/opt.h"
27 #include "os_support.h"
34 /** @name Logging context. */
36 static const char *urlcontext_to_name(void *ptr)
38 URLContext *h = (URLContext *)ptr;
39 if(h->prot) return h->prot->name;
42 static const AVOption options[] = {{NULL}};
43 static const AVClass urlcontext_class =
44 { "URLContext", urlcontext_to_name, options, LIBAVUTIL_VERSION_INT };
48 static int default_interrupt_cb(void);
50 URLProtocol *first_protocol = NULL;
51 URLInterruptCB *url_interrupt_cb = default_interrupt_cb;
53 URLProtocol *av_protocol_next(URLProtocol *p)
56 else return first_protocol;
59 int av_register_protocol2(URLProtocol *protocol, int size)
62 if (size < sizeof(URLProtocol)) {
63 URLProtocol* temp = av_mallocz(sizeof(URLProtocol));
64 memcpy(temp, protocol, size);
68 while (*p != NULL) p = &(*p)->next;
70 protocol->next = NULL;
74 #if FF_API_REGISTER_PROTOCOL
75 /* The layout of URLProtocol as of when major was bumped to 52 */
76 struct URLProtocol_compat {
78 int (*url_open)(URLContext *h, const char *filename, int flags);
79 int (*url_read)(URLContext *h, unsigned char *buf, int size);
80 int (*url_write)(URLContext *h, unsigned char *buf, int size);
81 int64_t (*url_seek)(URLContext *h, int64_t pos, int whence);
82 int (*url_close)(URLContext *h);
83 struct URLProtocol *next;
86 int av_register_protocol(URLProtocol *protocol)
88 return av_register_protocol2(protocol, sizeof(struct URLProtocol_compat));
91 int register_protocol(URLProtocol *protocol)
93 return av_register_protocol2(protocol, sizeof(struct URLProtocol_compat));
97 static int url_alloc_for_protocol (URLContext **puc, struct URLProtocol *up,
98 const char *filename, int flags)
104 if (!ff_network_init())
107 uc = av_mallocz(sizeof(URLContext) + strlen(filename) + 1);
109 err = AVERROR(ENOMEM);
113 uc->av_class = &urlcontext_class;
115 uc->filename = (char *) &uc[1];
116 strcpy(uc->filename, filename);
119 uc->is_streamed = 0; /* default = not streamed */
120 uc->max_packet_size = 0; /* default: stream file */
121 if (up->priv_data_size) {
122 uc->priv_data = av_mallocz(up->priv_data_size);
123 if (up->priv_data_class) {
124 *(const AVClass**)uc->priv_data = up->priv_data_class;
125 av_opt_set_defaults(uc->priv_data);
139 int url_connect(URLContext* uc)
141 int err = uc->prot->url_open(uc, uc->filename, uc->flags);
144 uc->is_connected = 1;
145 //We must be careful here as url_seek() could be slow, for example for http
146 if( (uc->flags & (URL_WRONLY | URL_RDWR))
147 || !strcmp(uc->prot->name, "file"))
148 if(!uc->is_streamed && url_seek(uc, 0, SEEK_SET) < 0)
153 int url_open_protocol (URLContext **puc, struct URLProtocol *up,
154 const char *filename, int flags)
158 ret = url_alloc_for_protocol(puc, up, filename, flags);
161 ret = url_connect(*puc);
170 #define URL_SCHEME_CHARS \
171 "abcdefghijklmnopqrstuvwxyz" \
172 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
175 int url_alloc(URLContext **puc, const char *filename, int flags)
178 char proto_str[128], proto_nested[128], *ptr;
179 size_t proto_len = strspn(filename, URL_SCHEME_CHARS);
181 if (filename[proto_len] != ':' || is_dos_path(filename))
182 strcpy(proto_str, "file");
184 av_strlcpy(proto_str, filename, FFMIN(proto_len+1, sizeof(proto_str)));
186 av_strlcpy(proto_nested, proto_str, sizeof(proto_nested));
187 if ((ptr = strchr(proto_nested, '+')))
192 if (!strcmp(proto_str, up->name))
193 return url_alloc_for_protocol (puc, up, filename, flags);
194 if (up->flags & URL_PROTOCOL_FLAG_NESTED_SCHEME &&
195 !strcmp(proto_nested, up->name))
196 return url_alloc_for_protocol (puc, up, filename, flags);
200 return AVERROR(ENOENT);
203 int url_open(URLContext **puc, const char *filename, int flags)
205 int ret = url_alloc(puc, filename, flags);
208 ret = url_connect(*puc);
216 static inline int retry_transfer_wrapper(URLContext *h, unsigned char *buf, int size, int size_min,
217 int (*transfer_func)(URLContext *h, unsigned char *buf, int size))
220 int fast_retries = 5;
223 while (len < size_min) {
224 ret = transfer_func(h, buf+len, size-len);
225 if (ret == AVERROR(EINTR))
227 if (h->flags & URL_FLAG_NONBLOCK)
229 if (ret == AVERROR(EAGAIN)) {
236 return ret < 0 ? ret : len;
238 fast_retries = FFMAX(fast_retries, 2);
240 if (url_interrupt_cb())
246 int url_read(URLContext *h, unsigned char *buf, int size)
248 if (h->flags & URL_WRONLY)
250 return retry_transfer_wrapper(h, buf, size, 1, h->prot->url_read);
253 int url_read_complete(URLContext *h, unsigned char *buf, int size)
255 if (h->flags & URL_WRONLY)
257 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_read);
260 int url_write(URLContext *h, const unsigned char *buf, int size)
262 if (!(h->flags & (URL_WRONLY | URL_RDWR)))
264 /* avoid sending too big packets */
265 if (h->max_packet_size && size > h->max_packet_size)
268 return retry_transfer_wrapper(h, buf, size, size, h->prot->url_write);
271 int64_t url_seek(URLContext *h, int64_t pos, int whence)
275 if (!h->prot->url_seek)
276 return AVERROR(ENOSYS);
277 ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
281 int url_close(URLContext *h)
284 if (!h) return 0; /* can happen when url_open fails */
286 if (h->is_connected && h->prot->url_close)
287 ret = h->prot->url_close(h);
291 if (h->prot->priv_data_size)
292 av_free(h->priv_data);
297 int url_exist(const char *filename)
300 if (url_open(&h, filename, URL_RDONLY) < 0)
306 int64_t url_filesize(URLContext *h)
310 size= url_seek(h, 0, AVSEEK_SIZE);
312 pos = url_seek(h, 0, SEEK_CUR);
313 if ((size = url_seek(h, -1, SEEK_END)) < 0)
316 url_seek(h, pos, SEEK_SET);
321 int url_get_file_handle(URLContext *h)
323 if (!h->prot->url_get_file_handle)
325 return h->prot->url_get_file_handle(h);
328 int url_get_max_packet_size(URLContext *h)
330 return h->max_packet_size;
333 void url_get_filename(URLContext *h, char *buf, int buf_size)
335 av_strlcpy(buf, h->filename, buf_size);
339 static int default_interrupt_cb(void)
344 void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
347 interrupt_cb = default_interrupt_cb;
348 url_interrupt_cb = interrupt_cb;
351 int av_url_read_pause(URLContext *h, int pause)
353 if (!h->prot->url_read_pause)
354 return AVERROR(ENOSYS);
355 return h->prot->url_read_pause(h, pause);
358 int64_t av_url_read_seek(URLContext *h,
359 int stream_index, int64_t timestamp, int flags)
361 if (!h->prot->url_read_seek)
362 return AVERROR(ENOSYS);
363 return h->prot->url_read_seek(h, stream_index, timestamp, flags);