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/*
* Concat URL protocol
* Copyright (c) 2006 Steve Lhomme
* Copyright (c) 2007 Wolfram Gloger
* Copyright (c) 2010 Michele Orrù
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "libavutil/avstring.h"
#include "libavutil/mem.h"
#define AV_CAT_SEPARATOR "|"
struct concat_nodes {
URLContext *uc; ///< node's URLContext
int64_t size; ///< url filesize
};
struct concat_data {
struct concat_nodes *nodes; ///< list of nodes to concat
size_t length; ///< number of cat'ed nodes
size_t current; ///< index of currently read node
};
static av_cold int concat_close(URLContext *h)
{
int err = 0;
size_t i;
struct concat_data *data = h->priv_data;
struct concat_nodes *nodes = data->nodes;
for (i = 0; i != data->length; i++)
err |= url_close(nodes[i].uc);
av_freep(&data->nodes);
av_freep(&h->priv_data);
return err < 0 ? -1 : 0;
}
static av_cold int concat_open(URLContext *h, const char *uri, int flags)
{
char *node_uri = NULL, *tmp_uri;
int err = 0;
int64_t size;
size_t len, i;
URLContext *uc;
struct concat_data *data;
struct concat_nodes *nodes;
av_strstart(uri, "concat:", &uri);
/* creating data */
if (!(data = av_mallocz(sizeof(*data))))
return AVERROR(ENOMEM);
h->priv_data = data;
for (i = 0, len = 1; uri[i]; i++)
if (uri[i] == *AV_CAT_SEPARATOR)
/* integer overflow */
if (++len == UINT_MAX / sizeof(*nodes)) {
av_freep(&h->priv_data);
return AVERROR(ENAMETOOLONG);
}
if (!(nodes = av_malloc(sizeof(*nodes) * len))) {
av_freep(&h->priv_data);
return AVERROR(ENOMEM);
} else
data->nodes = nodes;
/* handle input */
if (!*uri)
err = AVERROR(ENOENT);
for (i = 0; *uri; i++) {
/* parsing uri */
len = strcspn(uri, AV_CAT_SEPARATOR);
if (!(tmp_uri = av_realloc(node_uri, len+1))) {
err = AVERROR(ENOMEM);
break;
} else
node_uri = tmp_uri;
av_strlcpy(node_uri, uri, len+1);
uri += len + strspn(uri+len, AV_CAT_SEPARATOR);
/* creating URLContext */
if ((err = url_open(&uc, node_uri, flags)) < 0)
break;
/* creating size */
if ((size = url_filesize(uc)) < 0) {
url_close(uc);
err = AVERROR(ENOSYS);
break;
}
/* assembling */
nodes[i].uc = uc;
nodes[i].size = size;
}
av_free(node_uri);
data->length = i;
if (err < 0)
concat_close(h);
else if (!(nodes = av_realloc(nodes, data->length * sizeof(*nodes)))) {
concat_close(h);
err = AVERROR(ENOMEM);
} else
data->nodes = nodes;
return err;
}
static int concat_read(URLContext *h, unsigned char *buf, int size)
{
int result, total = 0;
struct concat_data *data = h->priv_data;
struct concat_nodes *nodes = data->nodes;
size_t i = data->current;
while (size > 0) {
result = url_read(nodes[i].uc, buf, size);
if (result < 0)
return total ? total : result;
if (!result)
if (i + 1 == data->length ||
url_seek(nodes[++i].uc, 0, SEEK_SET) < 0)
break;
total += result;
buf += result;
size -= result;
}
data->current = i;
return total;
}
static int64_t concat_seek(URLContext *h, int64_t pos, int whence)
{
int64_t result;
struct concat_data *data = h->priv_data;
struct concat_nodes *nodes = data->nodes;
size_t i;
switch (whence) {
case SEEK_END:
for (i = data->length - 1;
i && pos < -nodes[i-1].size;
i--)
pos += nodes[i-1].size;
break;
case SEEK_CUR:
/* get the absolute position */
for (i = 0; i != data->current; i++)
pos += nodes[i].size;
pos += url_seek(nodes[i].uc, 0, SEEK_CUR);
whence = SEEK_SET;
/* fall through with the absolute position */
case SEEK_SET:
for (i = 0; i != data->length - 1 && pos >= nodes[i].size; i++)
pos -= nodes[i].size;
break;
default:
return AVERROR(EINVAL);
}
result = url_seek(nodes[i].uc, pos, whence);
if (result >= 0) {
data->current = i;
while (i)
result += nodes[i--].size;
}
return result;
}
URLProtocol concat_protocol = {
"concat",
concat_open,
concat_read,
NULL,
concat_seek,
concat_close,
};
|
