3 * Copyright (c) 2006 Steve Lhomme
4 * Copyright (c) 2007 Wolfram Gloger
5 * Copyright (c) 2010 Michele OrrĂ¹
7 * This file is part of FFmpeg.
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "libavutil/avstring.h"
26 #include "libavutil/mem.h"
28 #define AV_CAT_SEPARATOR "|"
31 URLContext *uc; ///< node's URLContext
32 int64_t size; ///< url filesize
36 struct concat_nodes *nodes; ///< list of nodes to concat
37 size_t length; ///< number of cat'ed nodes
38 size_t current; ///< index of currently read node
41 static av_cold int concat_close(URLContext *h)
45 struct concat_data *data = h->priv_data;
46 struct concat_nodes *nodes = data->nodes;
48 for (i = 0; i != data->length; i++)
49 err |= url_close(nodes[i].uc);
51 av_freep(&data->nodes);
52 av_freep(&h->priv_data);
54 return err < 0 ? -1 : 0;
57 static av_cold int concat_open(URLContext *h, const char *uri, int flags)
59 char *node_uri = NULL, *tmp_uri;
64 struct concat_data *data;
65 struct concat_nodes *nodes;
67 av_strstart(uri, "concat:", &uri);
70 if (!(data = av_mallocz(sizeof(*data))))
71 return AVERROR(ENOMEM);
74 for (i = 0, len = 1; uri[i]; i++)
75 if (uri[i] == *AV_CAT_SEPARATOR)
76 /* integer overflow */
77 if (++len == UINT_MAX / sizeof(*nodes)) {
78 av_freep(&h->priv_data);
79 return AVERROR(ENAMETOOLONG);
82 if (!(nodes = av_malloc(sizeof(*nodes) * len))) {
83 av_freep(&h->priv_data);
84 return AVERROR(ENOMEM);
90 err = AVERROR(ENOENT);
91 for (i = 0; *uri; i++) {
93 len = strcspn(uri, AV_CAT_SEPARATOR);
94 if (!(tmp_uri = av_realloc(node_uri, len+1))) {
95 err = AVERROR(ENOMEM);
99 av_strlcpy(node_uri, uri, len+1);
100 uri += len + strspn(uri+len, AV_CAT_SEPARATOR);
102 /* creating URLContext */
103 if ((err = url_open(&uc, node_uri, flags)) < 0)
107 if ((size = url_filesize(uc)) < 0) {
109 err = AVERROR(ENOSYS);
115 nodes[i].size = size;
122 else if (!(nodes = av_realloc(nodes, data->length * sizeof(*nodes)))) {
124 err = AVERROR(ENOMEM);
130 static int concat_read(URLContext *h, unsigned char *buf, int size)
132 int result, total = 0;
133 struct concat_data *data = h->priv_data;
134 struct concat_nodes *nodes = data->nodes;
135 size_t i = data->current;
138 result = url_read(nodes[i].uc, buf, size);
140 return total ? total : result;
142 if (i + 1 == data->length ||
143 url_seek(nodes[++i].uc, 0, SEEK_SET) < 0)
153 static int64_t concat_seek(URLContext *h, int64_t pos, int whence)
156 struct concat_data *data = h->priv_data;
157 struct concat_nodes *nodes = data->nodes;
162 for (i = data->length - 1;
163 i && pos < -nodes[i].size;
165 pos += nodes[i].size;
168 /* get the absolute position */
169 for (i = 0; i != data->current; i++)
170 pos += nodes[i].size;
171 pos += url_seek(nodes[i].uc, 0, SEEK_CUR);
173 /* fall through with the absolute position */
175 for (i = 0; i != data->length - 1 && pos >= nodes[i].size; i++)
176 pos -= nodes[i].size;
179 return AVERROR(EINVAL);
182 result = url_seek(nodes[i].uc, pos, whence);
186 result += nodes[--i].size;
191 URLProtocol ff_concat_protocol = {