mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/*
|
|
* Unbuffered io for ffmpeg system
|
|
* Copyright (c) 2001 Gerard Lantau
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include "avformat.h"
|
|
|
|
URLProtocol *first_protocol = NULL;
|
|
|
|
int register_protocol(URLProtocol *protocol)
|
|
{
|
|
URLProtocol **p;
|
|
p = &first_protocol;
|
|
while (*p != NULL) p = &(*p)->next;
|
|
*p = protocol;
|
|
protocol->next = NULL;
|
|
return 0;
|
|
}
|
|
|
|
int url_open(URLContext **puc, const char *filename, int flags)
|
|
{
|
|
URLContext *uc;
|
|
URLProtocol *up;
|
|
const char *p;
|
|
char proto_str[128], *q;
|
|
int err;
|
|
|
|
p = filename;
|
|
q = proto_str;
|
|
while (*p != '\0' && *p != ':') {
|
|
if ((q - proto_str) < sizeof(proto_str) - 1)
|
|
*q++ = *p;
|
|
p++;
|
|
}
|
|
/* if the protocol has length 1, we consider it is a dos drive */
|
|
if (*p == '\0' || (q - proto_str) <= 1) {
|
|
strcpy(proto_str, "file");
|
|
} else {
|
|
*q = '\0';
|
|
}
|
|
|
|
up = first_protocol;
|
|
while (up != NULL) {
|
|
if (!strcmp(proto_str, up->name))
|
|
goto found;
|
|
up = up->next;
|
|
}
|
|
return -ENOENT;
|
|
found:
|
|
uc = malloc(sizeof(URLContext));
|
|
if (!uc)
|
|
return -ENOMEM;
|
|
uc->prot = up;
|
|
uc->flags = flags;
|
|
uc->is_streamed = 0; /* default = not streamed */
|
|
uc->packet_size = 1; /* default packet size */
|
|
err = up->url_open(uc, filename, flags);
|
|
if (err < 0) {
|
|
free(uc);
|
|
*puc = NULL;
|
|
return err;
|
|
}
|
|
*puc = uc;
|
|
return 0;
|
|
}
|
|
|
|
int url_read(URLContext *h, unsigned char *buf, int size)
|
|
{
|
|
int ret;
|
|
if (h->flags & URL_WRONLY)
|
|
return -EIO;
|
|
ret = h->prot->url_read(h, buf, size);
|
|
return ret;
|
|
}
|
|
|
|
int url_write(URLContext *h, unsigned char *buf, int size)
|
|
{
|
|
int ret;
|
|
if (!(h->flags & URL_WRONLY))
|
|
return -EIO;
|
|
ret = h->prot->url_write(h, buf, size);
|
|
return ret;
|
|
}
|
|
|
|
offset_t url_seek(URLContext *h, offset_t pos, int whence)
|
|
{
|
|
offset_t ret;
|
|
|
|
if (!h->prot->url_seek)
|
|
return -EPIPE;
|
|
ret = h->prot->url_seek(h, pos, whence);
|
|
return ret;
|
|
}
|
|
|
|
int url_getformat(URLContext *h, URLFormat *f)
|
|
{
|
|
memset(f, 0, sizeof(*f));
|
|
if (!h->prot->url_getformat)
|
|
return -ENODATA;
|
|
return h->prot->url_getformat(h, f);
|
|
}
|
|
|
|
int url_close(URLContext *h)
|
|
{
|
|
int ret;
|
|
|
|
ret = h->prot->url_close(h);
|
|
free(h);
|
|
return ret;
|
|
}
|
|
|
|
int url_exist(const char *filename)
|
|
{
|
|
URLContext *h;
|
|
if (url_open(&h, filename, URL_RDONLY) < 0)
|
|
return 0;
|
|
url_close(h);
|
|
return 1;
|
|
}
|
|
|
|
offset_t url_filesize(URLContext *h)
|
|
{
|
|
offset_t pos, size;
|
|
|
|
pos = url_seek(h, 0, SEEK_CUR);
|
|
size = url_seek(h, 0, SEEK_END);
|
|
url_seek(h, pos, SEEK_SET);
|
|
return size;
|
|
}
|