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
23 static int default_interrupt_cb(void);
25 URLProtocol *first_protocol = NULL;
26 URLInterruptCB *url_interrupt_cb = default_interrupt_cb;
28 int register_protocol(URLProtocol *protocol)
32 while (*p != NULL) p = &(*p)->next;
34 protocol->next = NULL;
38 int url_open(URLContext **puc, const char *filename, int flags)
43 char proto_str[128], *q;
48 while (*p != '\0' && *p != ':') {
49 /* protocols can only contain alphabetic chars */
52 if ((q - proto_str) < sizeof(proto_str) - 1)
56 /* if the protocol has length 1, we consider it is a dos drive */
57 if (*p == '\0' || (q - proto_str) <= 1) {
59 strcpy(proto_str, "file");
66 if (!strcmp(proto_str, up->name))
73 uc = av_malloc(sizeof(URLContext) + strlen(filename));
78 strcpy(uc->filename, filename);
81 uc->is_streamed = 0; /* default = not streamed */
82 uc->max_packet_size = 0; /* default: stream file */
83 err = up->url_open(uc, filename, flags);
96 int url_read(URLContext *h, unsigned char *buf, int size)
99 if (h->flags & URL_WRONLY)
101 ret = h->prot->url_read(h, buf, size);
105 #if defined(CONFIG_MUXERS) || defined(CONFIG_PROTOCOLS)
106 int url_write(URLContext *h, unsigned char *buf, int size)
109 if (!(h->flags & (URL_WRONLY | URL_RDWR)))
111 /* avoid sending too big packets */
112 if (h->max_packet_size && size > h->max_packet_size)
114 ret = h->prot->url_write(h, buf, size);
117 #endif //CONFIG_MUXERS || CONFIG_PROTOCOLS
119 offset_t url_seek(URLContext *h, offset_t pos, int whence)
123 if (!h->prot->url_seek)
125 ret = h->prot->url_seek(h, pos, whence);
129 int url_close(URLContext *h)
133 ret = h->prot->url_close(h);
138 int url_exist(const char *filename)
141 if (url_open(&h, filename, URL_RDONLY) < 0)
147 offset_t url_filesize(URLContext *h)
151 size= url_seek(h, 0, AVSEEK_SIZE);
153 pos = url_seek(h, 0, SEEK_CUR);
154 size = url_seek(h, -1, SEEK_END)+1;
155 url_seek(h, pos, SEEK_SET);
161 * Return the maximum packet size associated to packetized file
162 * handle. If the file is not packetized (stream like http or file on
163 * disk), then 0 is returned.
165 * @param h file handle
166 * @return maximum packet size in bytes
168 int url_get_max_packet_size(URLContext *h)
170 return h->max_packet_size;
173 void url_get_filename(URLContext *h, char *buf, int buf_size)
175 pstrcpy(buf, buf_size, h->filename);
179 static int default_interrupt_cb(void)
185 * The callback is called in blocking functions to test regulary if
186 * asynchronous interruption is needed. -EINTR is returned in this
187 * case by the interrupted function. 'NULL' means no interrupt
190 void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
193 interrupt_cb = default_interrupt_cb;
194 url_interrupt_cb = interrupt_cb;