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/*
* Copyright (C) 2003-2015 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>
#include <string.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 DetachedSong *NextSong() override;
};
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 = new DetachedSong(uri);
song->SetStartTime(SongTime::FromScale(start, sample_rate));
song->SetEndTime(SongTime::FromScale(end, sample_rate));
return song;
}
static SongEnumerator *
flac_playlist_open_uri(const char *uri,
gcc_unused Mutex &mutex, gcc_unused Cond &cond)
{
if (!PathTraitsUTF8::IsAbsolute(uri))
/* only local files supported */
return nullptr;
const auto path_fs = AllocatedPath::FromUTF8(uri);
if (path_fs.IsNull())
return nullptr;
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 new 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,
};
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