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