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
25 #if LIBAVFORMAT_VERSION_MAJOR >= 53
26 /** @name Logging context. */
28 static const char *urlcontext_to_name(void *ptr)
30 URLContext *h = (URLContext *)ptr;
31 if(h->prot) return h->prot->name;
34 static const AVOption options[] = {{NULL}};
35 static const AVClass urlcontext_class =
36 { "URLContext", urlcontext_to_name, options };
40 static int default_interrupt_cb(void);
42 URLProtocol *first_protocol = NULL;
43 URLInterruptCB *url_interrupt_cb = default_interrupt_cb;
45 URLProtocol *av_protocol_next(URLProtocol *p)
48 else return first_protocol;
51 int register_protocol(URLProtocol *protocol)
55 while (*p != NULL) p = &(*p)->next;
57 protocol->next = NULL;
61 int url_open(URLContext **puc, const char *filename, int flags)
66 char proto_str[128], *q;
71 while (*p != '\0' && *p != ':') {
72 /* protocols can only contain alphabetic chars */
75 if ((q - proto_str) < sizeof(proto_str) - 1)
79 /* if the protocol has length 1, we consider it is a dos drive */
80 if (*p == '\0' || (q - proto_str) <= 1) {
82 strcpy(proto_str, "file");
89 if (!strcmp(proto_str, up->name))
93 err = AVERROR(ENOENT);
96 uc = av_malloc(sizeof(URLContext) + strlen(filename) + 1);
98 err = AVERROR(ENOMEM);
101 #if LIBAVFORMAT_VERSION_MAJOR >= 53
102 uc->av_class = &urlcontext_class;
104 uc->filename = (char *) &uc[1];
105 strcpy(uc->filename, filename);
108 uc->is_streamed = 0; /* default = not streamed */
109 uc->max_packet_size = 0; /* default: stream file */
110 err = up->url_open(uc, filename, flags);
123 int url_read(URLContext *h, unsigned char *buf, int size)
126 if (h->flags & URL_WRONLY)
128 ret = h->prot->url_read(h, buf, size);
132 int url_write(URLContext *h, unsigned char *buf, int size)
135 if (!(h->flags & (URL_WRONLY | URL_RDWR)))
137 /* avoid sending too big packets */
138 if (h->max_packet_size && size > h->max_packet_size)
140 ret = h->prot->url_write(h, buf, size);
144 offset_t url_seek(URLContext *h, offset_t pos, int whence)
148 if (!h->prot->url_seek)
149 return AVERROR(EPIPE);
150 ret = h->prot->url_seek(h, pos, whence);
154 int url_close(URLContext *h)
157 if (!h) return 0; /* can happen when url_open fails */
159 if (h->prot->url_close)
160 ret = h->prot->url_close(h);
165 int url_exist(const char *filename)
168 if (url_open(&h, filename, URL_RDONLY) < 0)
174 offset_t url_filesize(URLContext *h)
178 size= url_seek(h, 0, AVSEEK_SIZE);
180 pos = url_seek(h, 0, SEEK_CUR);
181 if ((size = url_seek(h, -1, SEEK_END)) < 0)
184 url_seek(h, pos, SEEK_SET);
189 int url_get_max_packet_size(URLContext *h)
191 return h->max_packet_size;
194 void url_get_filename(URLContext *h, char *buf, int buf_size)
196 av_strlcpy(buf, h->filename, buf_size);
200 static int default_interrupt_cb(void)
205 void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
208 interrupt_cb = default_interrupt_cb;
209 url_interrupt_cb = interrupt_cb;
212 int av_url_read_pause(URLContext *h, int pause)
214 if (!h->prot->url_read_pause)
215 return AVERROR(ENOSYS);
216 return h->prot->url_read_pause(h, pause);
219 offset_t av_url_read_seek(URLContext *h,
220 int stream_index, int64_t timestamp, int flags)
222 if (!h->prot->url_read_seek)
223 return AVERROR(ENOSYS);
224 return h->prot->url_read_seek(h, stream_index, timestamp, flags);