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
24 static int default_interrupt_cb(void);
26 URLProtocol *first_protocol = NULL;
27 URLInterruptCB *url_interrupt_cb = default_interrupt_cb;
29 URLProtocol *av_protocol_next(URLProtocol *p)
32 else return first_protocol;
35 int register_protocol(URLProtocol *protocol)
39 while (*p != NULL) p = &(*p)->next;
41 protocol->next = NULL;
45 int url_open(URLContext **puc, const char *filename, int flags)
50 char proto_str[128], *q;
55 while (*p != '\0' && *p != ':') {
56 /* protocols can only contain alphabetic chars */
59 if ((q - proto_str) < sizeof(proto_str) - 1)
63 /* if the protocol has length 1, we consider it is a dos drive */
64 if (*p == '\0' || (q - proto_str) <= 1) {
66 strcpy(proto_str, "file");
73 if (!strcmp(proto_str, up->name))
77 err = AVERROR(ENOENT);
80 uc = av_malloc(sizeof(URLContext) + strlen(filename) + 1);
82 err = AVERROR(ENOMEM);
85 uc->filename = (char *) &uc[1];
86 strcpy(uc->filename, filename);
89 uc->is_streamed = 0; /* default = not streamed */
90 uc->max_packet_size = 0; /* default: stream file */
91 err = up->url_open(uc, filename, flags);
104 int url_read(URLContext *h, unsigned char *buf, int size)
107 if (h->flags & URL_WRONLY)
109 ret = h->prot->url_read(h, buf, size);
113 #if defined(CONFIG_MUXERS) || defined(CONFIG_PROTOCOLS)
114 int url_write(URLContext *h, unsigned char *buf, int size)
117 if (!(h->flags & (URL_WRONLY | URL_RDWR)))
119 /* avoid sending too big packets */
120 if (h->max_packet_size && size > h->max_packet_size)
122 ret = h->prot->url_write(h, buf, size);
125 #endif //CONFIG_MUXERS || CONFIG_PROTOCOLS
127 offset_t url_seek(URLContext *h, offset_t pos, int whence)
131 if (!h->prot->url_seek)
132 return AVERROR(EPIPE);
133 ret = h->prot->url_seek(h, pos, whence);
137 int url_close(URLContext *h)
140 if (!h) return 0; /* can happen when url_open fails */
142 if (h->prot->url_close)
143 ret = h->prot->url_close(h);
148 int url_exist(const char *filename)
151 if (url_open(&h, filename, URL_RDONLY) < 0)
157 offset_t url_filesize(URLContext *h)
161 size= url_seek(h, 0, AVSEEK_SIZE);
163 pos = url_seek(h, 0, SEEK_CUR);
164 if ((size = url_seek(h, -1, SEEK_END)) < 0)
167 url_seek(h, pos, SEEK_SET);
172 int url_get_max_packet_size(URLContext *h)
174 return h->max_packet_size;
177 void url_get_filename(URLContext *h, char *buf, int buf_size)
179 av_strlcpy(buf, h->filename, buf_size);
183 static int default_interrupt_cb(void)
188 void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
191 interrupt_cb = default_interrupt_cb;
192 url_interrupt_cb = interrupt_cb;
195 int av_url_read_pause(URLContext *h, int pause)
197 if (!h->prot->url_read_pause)
198 return AVERROR(ENOSYS);
199 return h->prot->url_read_pause(h, pause);
202 int av_url_read_seek(URLContext *h,
203 int stream_index, int64_t timestamp, int flags)
205 if (!h->prot->url_read_seek)
206 return AVERROR(ENOSYS);
207 return h->prot->url_read_seek(h, stream_index, timestamp, flags);