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/*
* Copyright 2003-2019 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 "FlacPlaylistPlugin.hxx"
#include "../PlaylistPlugin.hxx"
#include "../MemorySongEnumerator.hxx"
#include "song/DetachedSong.hxx"
#include "fs/Traits.hxx"
#include "fs/AllocatedPath.hxx"
#include "fs/NarrowPath.hxx"
#include "util/ScopeExit.hxx"
#include <FLAC/metadata.h>
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;
AtScopeExit(cuesheet) { FLAC__metadata_object_delete(cuesheet); };
FLAC__StreamMetadata streaminfo;
if (!FLAC__metadata_get_streaminfo(narrow_path_fs, &streaminfo) ||
streaminfo.data.stream_info.sample_rate == 0) {
return nullptr;
}
const unsigned sample_rate = streaminfo.data.stream_info.sample_rate;
const FLAC__uint64 total_samples = streaminfo.data.stream_info.total_samples;
std::forward_list<DetachedSong> songs;
auto tail = songs.before_begin();
const auto &c = cuesheet->data.cue_sheet;
for (unsigned i = 0; i < c.num_tracks; ++i) {
const auto &track = c.tracks[i];
if (track.type != 0)
continue;
const FLAC__uint64 start = track.offset;
const FLAC__uint64 end = i + 1 < c.num_tracks
? c.tracks[i + 1].offset
: total_samples;
tail = songs.emplace_after(tail, uri);
auto &song = *tail;
song.SetStartTime(SongTime::FromScale(start, sample_rate));
song.SetEndTime(SongTime::FromScale(end, sample_rate));
}
return std::make_unique<MemorySongEnumerator>(std::move(songs));
}
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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