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apetagenc.c
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1 /*
2  * APE tag writer
3  * Copyright (c) 2012 Paul B Mahol
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/dict.h"
23 #include "avio_internal.h"
24 #include "avformat.h"
25 #include "apetag.h"
26 
27 static int string_is_ascii(const uint8_t *str)
28 {
29  while (*str && *str >= 0x20 && *str <= 0x7e ) str++;
30  return !*str;
31 }
32 
34 {
35  int64_t tag_bytes;
37  AVIOContext *pb = s->pb;
38  int tags = 0, vlen;
39 
40  tag_bytes = avio_tell(s->pb);
41  while ((t = av_dict_get(s->metadata, "", t, AV_DICT_IGNORE_SUFFIX))) {
42  if (!string_is_ascii(t->key)) {
43  av_log(s, AV_LOG_WARNING, "Non ASCII keys are not allowed\n");
44  continue;
45  }
46 
47  vlen = strlen(t->value);
48  avio_wl32(pb, vlen + 1);
49  avio_wl32(pb, 0); // flags
50  avio_put_str(pb, t->key);
51  avio_put_str(pb, t->value);
52  tags++;
53  }
54  tag_bytes = avio_tell(s->pb) - tag_bytes;
55 
56  if (!tags)
57  return;
58 
61  avio_wl32(pb, tag_bytes + APE_TAG_FOOTER_BYTES);
62  avio_wl32(pb, tags); // item count
63  avio_wl32(pb, 0); // global flags
64  ffio_fill(pb, 0, 8); // reserved
65 }