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 "libavcodec/opt.h"
27 #include "os_support.h"
33 #if LIBAVFORMAT_VERSION_MAJOR >= 53
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 LIBAVFORMAT_VERSION_MAJOR < 53
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_protocol(protocol);
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);
112 #if LIBAVFORMAT_VERSION_MAJOR >= 53
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 */
132 int url_connect(URLContext* uc)
134 int err = uc->prot->url_open(uc, uc->filename, uc->flags);
137 uc->is_connected = 1;
138 //We must be careful here as url_seek() could be slow, for example for http
139 if( (uc->flags & (URL_WRONLY | URL_RDWR))
140 || !strcmp(uc->prot->name, "file"))
141 if(!uc->is_streamed && url_seek(uc, 0, SEEK_SET) < 0)
146 int url_open_protocol (URLContext **puc, struct URLProtocol *up,
147 const char *filename, int flags)
151 ret = url_alloc_for_protocol(puc, up, filename, flags);
154 ret = url_connect(*puc);
163 int url_alloc(URLContext **puc, const char *filename, int flags)
167 char proto_str[128], *q;
171 while (*p != '\0' && *p != ':') {
172 /* protocols can only contain alphabetic chars */
175 if ((q - proto_str) < sizeof(proto_str) - 1)
179 /* if the protocol has length 1, we consider it is a dos drive */
180 if (*p == '\0' || is_dos_path(filename)) {
182 strcpy(proto_str, "file");
189 if (!strcmp(proto_str, up->name))
190 return url_alloc_for_protocol (puc, up, filename, flags);
194 return AVERROR(ENOENT);
197 int url_open(URLContext **puc, const char *filename, int flags)
199 int ret = url_alloc(puc, filename, flags);
202 ret = url_connect(*puc);
211 int url_read(URLContext *h, unsigned char *buf, int size)
214 if (h->flags & URL_WRONLY)
216 ret = h->prot->url_read(h, buf, size);
220 int url_read_complete(URLContext *h, unsigned char *buf, int size)
223 int fast_retries = 5;
227 ret = url_read(h, buf+len, size-len);
228 if (ret == AVERROR(EAGAIN)) {
235 return ret < 0 ? ret : len;
237 fast_retries = FFMAX(fast_retries, 2);
243 int url_write(URLContext *h, const unsigned char *buf, int size)
246 if (!(h->flags & (URL_WRONLY | URL_RDWR)))
248 /* avoid sending too big packets */
249 if (h->max_packet_size && size > h->max_packet_size)
251 ret = h->prot->url_write(h, buf, size);
255 int64_t url_seek(URLContext *h, int64_t pos, int whence)
259 if (!h->prot->url_seek)
260 return AVERROR(ENOSYS);
261 ret = h->prot->url_seek(h, pos, whence & ~AVSEEK_FORCE);
265 int url_close(URLContext *h)
268 if (!h) return 0; /* can happen when url_open fails */
270 if (h->is_connected && h->prot->url_close)
271 ret = h->prot->url_close(h);
279 int url_exist(const char *filename)
282 if (url_open(&h, filename, URL_RDONLY) < 0)
288 int64_t url_filesize(URLContext *h)
292 size= url_seek(h, 0, AVSEEK_SIZE);
294 pos = url_seek(h, 0, SEEK_CUR);
295 if ((size = url_seek(h, -1, SEEK_END)) < 0)
298 url_seek(h, pos, SEEK_SET);
303 int url_get_file_handle(URLContext *h)
305 if (!h->prot->url_get_file_handle)
307 return h->prot->url_get_file_handle(h);
310 int url_get_max_packet_size(URLContext *h)
312 return h->max_packet_size;
315 void url_get_filename(URLContext *h, char *buf, int buf_size)
317 av_strlcpy(buf, h->filename, buf_size);
321 static int default_interrupt_cb(void)
326 void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
329 interrupt_cb = default_interrupt_cb;
330 url_interrupt_cb = interrupt_cb;
333 int av_url_read_pause(URLContext *h, int pause)
335 if (!h->prot->url_read_pause)
336 return AVERROR(ENOSYS);
337 return h->prot->url_read_pause(h, pause);
340 int64_t av_url_read_seek(URLContext *h,
341 int stream_index, int64_t timestamp, int flags)
343 if (!h->prot->url_read_seek)
344 return AVERROR(ENOSYS);
345 return h->prot->url_read_seek(h, stream_index, timestamp, flags);