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 #include "libavutil/avstring.h"
23 #include "libavcodec/opt.h"
24 #include "os_support.h"
27 #if LIBAVFORMAT_VERSION_MAJOR >= 53
28 /** @name Logging context. */
30 static const char *urlcontext_to_name(void *ptr)
32 URLContext *h = (URLContext *)ptr;
33 if(h->prot) return h->prot->name;
36 static const AVOption options[] = {{NULL}};
37 static const AVClass urlcontext_class =
38 { "URLContext", urlcontext_to_name, options };
42 static int default_interrupt_cb(void);
44 URLProtocol *first_protocol = NULL;
45 URLInterruptCB *url_interrupt_cb = default_interrupt_cb;
47 URLProtocol *av_protocol_next(URLProtocol *p)
50 else return first_protocol;
53 int av_register_protocol(URLProtocol *protocol)
57 while (*p != NULL) p = &(*p)->next;
59 protocol->next = NULL;
63 #if LIBAVFORMAT_VERSION_MAJOR < 53
64 int register_protocol(URLProtocol *protocol)
66 return av_register_protocol(protocol);
70 int url_open_protocol (URLContext **puc, struct URLProtocol *up,
71 const char *filename, int flags)
76 uc = av_malloc(sizeof(URLContext) + strlen(filename) + 1);
78 err = AVERROR(ENOMEM);
81 #if LIBAVFORMAT_VERSION_MAJOR >= 53
82 uc->av_class = &urlcontext_class;
84 uc->filename = (char *) &uc[1];
85 strcpy(uc->filename, filename);
88 uc->is_streamed = 0; /* default = not streamed */
89 uc->max_packet_size = 0; /* default: stream file */
90 err = up->url_open(uc, filename, flags);
97 //We must be carefull here as url_seek() could be slow, for example for http
98 if( (flags & (URL_WRONLY | URL_RDWR))
99 || !strcmp(up->name, "file"))
100 if(!uc->is_streamed && url_seek(uc, 0, SEEK_SET) < 0)
109 int url_open(URLContext **puc, const char *filename, int flags)
113 char proto_str[128], *q;
117 while (*p != '\0' && *p != ':') {
118 /* protocols can only contain alphabetic chars */
121 if ((q - proto_str) < sizeof(proto_str) - 1)
125 /* if the protocol has length 1, we consider it is a dos drive */
126 if (*p == '\0' || is_dos_path(filename)) {
128 strcpy(proto_str, "file");
135 if (!strcmp(proto_str, up->name))
136 return url_open_protocol (puc, up, filename, flags);
140 return AVERROR(ENOENT);
143 int url_read(URLContext *h, unsigned char *buf, int size)
146 if (h->flags & URL_WRONLY)
148 ret = h->prot->url_read(h, buf, size);
152 int url_write(URLContext *h, unsigned char *buf, int size)
155 if (!(h->flags & (URL_WRONLY | URL_RDWR)))
157 /* avoid sending too big packets */
158 if (h->max_packet_size && size > h->max_packet_size)
160 ret = h->prot->url_write(h, buf, size);
164 int64_t url_seek(URLContext *h, int64_t pos, int whence)
168 if (!h->prot->url_seek)
169 return AVERROR(EPIPE);
170 ret = h->prot->url_seek(h, pos, whence);
174 int url_close(URLContext *h)
177 if (!h) return 0; /* can happen when url_open fails */
179 if (h->prot->url_close)
180 ret = h->prot->url_close(h);
185 int url_exist(const char *filename)
188 if (url_open(&h, filename, URL_RDONLY) < 0)
194 int64_t url_filesize(URLContext *h)
198 size= url_seek(h, 0, AVSEEK_SIZE);
200 pos = url_seek(h, 0, SEEK_CUR);
201 if ((size = url_seek(h, -1, SEEK_END)) < 0)
204 url_seek(h, pos, SEEK_SET);
209 int url_get_max_packet_size(URLContext *h)
211 return h->max_packet_size;
214 void url_get_filename(URLContext *h, char *buf, int buf_size)
216 av_strlcpy(buf, h->filename, buf_size);
220 static int default_interrupt_cb(void)
225 void url_set_interrupt_cb(URLInterruptCB *interrupt_cb)
228 interrupt_cb = default_interrupt_cb;
229 url_interrupt_cb = interrupt_cb;
232 int av_url_read_pause(URLContext *h, int pause)
234 if (!h->prot->url_read_pause)
235 return AVERROR(ENOSYS);
236 return h->prot->url_read_pause(h, pause);
239 int64_t av_url_read_seek(URLContext *h,
240 int stream_index, int64_t timestamp, int flags)
242 if (!h->prot->url_read_seek)
243 return AVERROR(ENOSYS);
244 return h->prot->url_read_seek(h, stream_index, timestamp, flags);