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"
29 #define AV_CAT_SEPARATOR "|"
32 URLContext *uc; ///< node's URLContext
33 int64_t size; ///< url filesize
37 struct concat_nodes *nodes; ///< list of nodes to concat
38 size_t length; ///< number of cat'ed nodes
39 size_t current; ///< index of currently read node
42 static av_cold int concat_close(URLContext *h)
46 struct concat_data *data = h->priv_data;
47 struct concat_nodes *nodes = data->nodes;
49 for (i = 0; i != data->length; i++)
50 err |= ffurl_close(nodes[i].uc);
52 av_freep(&data->nodes);
53 av_freep(&h->priv_data);
55 return err < 0 ? -1 : 0;
58 static av_cold int concat_open(URLContext *h, const char *uri, int flags)
60 char *node_uri = NULL, *tmp_uri;
65 struct concat_data *data;
66 struct concat_nodes *nodes;
68 av_strstart(uri, "concat:", &uri);
71 if (!(data = av_mallocz(sizeof(*data))))
72 return AVERROR(ENOMEM);
75 for (i = 0, len = 1; uri[i]; i++)
76 if (uri[i] == *AV_CAT_SEPARATOR)
77 /* integer overflow */
78 if (++len == UINT_MAX / sizeof(*nodes)) {
79 av_freep(&h->priv_data);
80 return AVERROR(ENAMETOOLONG);
83 if (!(nodes = av_malloc(sizeof(*nodes) * len))) {
84 av_freep(&h->priv_data);
85 return AVERROR(ENOMEM);
91 err = AVERROR(ENOENT);
92 for (i = 0; *uri; i++) {
94 len = strcspn(uri, AV_CAT_SEPARATOR);
95 if (!(tmp_uri = av_realloc(node_uri, len+1))) {
96 err = AVERROR(ENOMEM);
100 av_strlcpy(node_uri, uri, len+1);
101 uri += len + strspn(uri+len, AV_CAT_SEPARATOR);
103 /* creating URLContext */
104 if ((err = ffurl_open(&uc, node_uri, flags)) < 0)
108 if ((size = ffurl_size(uc)) < 0) {
110 err = AVERROR(ENOSYS);
116 nodes[i].size = size;
123 else if (!(nodes = av_realloc(nodes, data->length * sizeof(*nodes)))) {
125 err = AVERROR(ENOMEM);
131 static int concat_read(URLContext *h, unsigned char *buf, int size)
133 int result, total = 0;
134 struct concat_data *data = h->priv_data;
135 struct concat_nodes *nodes = data->nodes;
136 size_t i = data->current;
139 result = ffurl_read(nodes[i].uc, buf, size);
141 return total ? total : result;
143 if (i + 1 == data->length ||
144 ffurl_seek(nodes[++i].uc, 0, SEEK_SET) < 0)
154 static int64_t concat_seek(URLContext *h, int64_t pos, int whence)
157 struct concat_data *data = h->priv_data;
158 struct concat_nodes *nodes = data->nodes;
163 for (i = data->length - 1;
164 i && pos < -nodes[i].size;
166 pos += nodes[i].size;
169 /* get the absolute position */
170 for (i = 0; i != data->current; i++)
171 pos += nodes[i].size;
172 pos += ffurl_seek(nodes[i].uc, 0, SEEK_CUR);
174 /* fall through with the absolute position */
176 for (i = 0; i != data->length - 1 && pos >= nodes[i].size; i++)
177 pos -= nodes[i].size;
180 return AVERROR(EINVAL);
183 result = ffurl_seek(nodes[i].uc, pos, whence);
187 result += nodes[--i].size;
192 URLProtocol ff_concat_protocol = {
194 .url_open = concat_open,
195 .url_read = concat_read,
196 .url_seek = concat_seek,
197 .url_close = concat_close,