1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/** \file
*
* Playlist plugin that reads embedded cue sheets from the "CUESHEET"
* tag of a music file.
*/
#include "config.h"
#include "FlacPlaylistPlugin.hxx"
#include "../PlaylistPlugin.hxx"
#include "../SongEnumerator.hxx"
#include "DetachedSong.hxx"
#include "fs/Traits.hxx"
#include "fs/AllocatedPath.hxx"
#include "fs/NarrowPath.hxx"
#include <FLAC/metadata.h>
class FlacPlaylist final : public SongEnumerator {
const char *const uri;
FLAC__StreamMetadata *const cuesheet;
const unsigned sample_rate;
const FLAC__uint64 total_samples;
unsigned next_track = 0;
public:
FlacPlaylist(const char *_uri,
FLAC__StreamMetadata *_cuesheet,
const FLAC__StreamMetadata &streaminfo)
:uri(_uri), cuesheet(_cuesheet),
sample_rate(streaminfo.data.stream_info.sample_rate),
total_samples(streaminfo.data.stream_info.total_samples) {
}
virtual ~FlacPlaylist() {
FLAC__metadata_object_delete(cuesheet);
}
virtual std::unique_ptr<DetachedSong> NextSong() override;
};
std::unique_ptr<DetachedSong>
FlacPlaylist::NextSong()
{
const FLAC__StreamMetadata_CueSheet &c = cuesheet->data.cue_sheet;
/* find the next audio track */
while (next_track < c.num_tracks &&
(c.tracks[next_track].number > c.num_tracks ||
c.tracks[next_track].type != 0))
++next_track;
if (next_track >= c.num_tracks)
return nullptr;
FLAC__uint64 start = c.tracks[next_track].offset;
++next_track;
FLAC__uint64 end = next_track < c.num_tracks
? c.tracks[next_track].offset
: total_samples;
auto song = std::make_unique<DetachedSong>(uri);
song->SetStartTime(SongTime::FromScale(start, sample_rate));
song->SetEndTime(SongTime::FromScale(end, sample_rate));
return song;
}
static std::unique_ptr<SongEnumerator>
flac_playlist_open_uri(const char *uri,
gcc_unused Mutex &mutex)
{
if (!PathTraitsUTF8::IsAbsolute(uri))
/* only local files supported */
return nullptr;
const auto path_fs = AllocatedPath::FromUTF8Throw(uri);
const NarrowPath narrow_path_fs(path_fs);
FLAC__StreamMetadata *cuesheet;
if (!FLAC__metadata_get_cuesheet(narrow_path_fs, &cuesheet))
return nullptr;
FLAC__StreamMetadata streaminfo;
if (!FLAC__metadata_get_streaminfo(uri, &streaminfo) ||
streaminfo.data.stream_info.sample_rate == 0) {
FLAC__metadata_object_delete(cuesheet);
return nullptr;
}
return std::make_unique<FlacPlaylist>(uri, cuesheet, streaminfo);
}
static const char *const flac_playlist_suffixes[] = {
"flac",
nullptr
};
const struct playlist_plugin flac_playlist_plugin = {
"flac",
nullptr,
nullptr,
flac_playlist_open_uri,
nullptr,
nullptr,
flac_playlist_suffixes,
nullptr,
};
|
