mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-18 03:19:31 +02:00
157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*
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* Unbuffered io for ffmpeg system
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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URLProtocol *first_protocol = NULL;
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int register_protocol(URLProtocol *protocol)
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{
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URLProtocol **p;
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p = &first_protocol;
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while (*p != NULL) p = &(*p)->next;
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*p = protocol;
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protocol->next = NULL;
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return 0;
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}
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int url_open(URLContext **puc, const char *filename, int flags)
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{
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URLContext *uc;
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URLProtocol *up;
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const char *p;
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char proto_str[128], *q;
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int err;
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p = filename;
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q = proto_str;
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while (*p != '\0' && *p != ':') {
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if ((q - proto_str) < sizeof(proto_str) - 1)
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*q++ = *p;
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p++;
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}
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/* if the protocol has length 1, we consider it is a dos drive */
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if (*p == '\0' || (q - proto_str) <= 1) {
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strcpy(proto_str, "file");
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} else {
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*q = '\0';
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}
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up = first_protocol;
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while (up != NULL) {
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if (!strcmp(proto_str, up->name))
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goto found;
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up = up->next;
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}
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err = -ENOENT;
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goto fail;
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found:
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uc = av_malloc(sizeof(URLContext));
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if (!uc) {
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err = -ENOMEM;
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goto fail;
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}
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uc->prot = up;
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uc->flags = flags;
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uc->is_streamed = 0; /* default = not streamed */
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uc->max_packet_size = 0; /* default: stream file */
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err = up->url_open(uc, filename, flags);
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if (err < 0) {
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av_free(uc);
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*puc = NULL;
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return err;
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}
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*puc = uc;
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return 0;
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fail:
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*puc = NULL;
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return err;
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}
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int url_read(URLContext *h, unsigned char *buf, int size)
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{
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int ret;
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if (h->flags & URL_WRONLY)
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return -EIO;
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ret = h->prot->url_read(h, buf, size);
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return ret;
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}
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int url_write(URLContext *h, unsigned char *buf, int size)
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{
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int ret;
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if (!(h->flags & (URL_WRONLY | URL_RDWR)))
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return -EIO;
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/* avoid sending too big packets */
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if (h->max_packet_size && size > h->max_packet_size)
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return -EIO;
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ret = h->prot->url_write(h, buf, size);
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return ret;
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}
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offset_t url_seek(URLContext *h, offset_t pos, int whence)
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{
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offset_t ret;
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if (!h->prot->url_seek)
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return -EPIPE;
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ret = h->prot->url_seek(h, pos, whence);
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return ret;
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}
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int url_close(URLContext *h)
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{
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int ret;
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ret = h->prot->url_close(h);
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av_free(h);
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return ret;
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}
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int url_exist(const char *filename)
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{
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URLContext *h;
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if (url_open(&h, filename, URL_RDONLY) < 0)
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return 0;
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url_close(h);
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return 1;
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}
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offset_t url_filesize(URLContext *h)
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{
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offset_t pos, size;
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pos = url_seek(h, 0, SEEK_CUR);
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size = url_seek(h, 0, SEEK_END);
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url_seek(h, pos, SEEK_SET);
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return size;
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}
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/*
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* Return the maximum packet size associated to packetized file
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* handle. If the file is not packetized (stream like http or file on
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* disk), then 0 is returned.
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*
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* @param h file handle
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* @return maximum packet size in bytes
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*/
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int url_get_max_packet_size(URLContext *h)
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{
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return h->max_packet_size;
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}
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