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/*
* Copyright 2003-2021 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 "lib/xiph/FlacMetadataChain.hxx"
#include "lib/xiph/FlacMetadataIterator.hxx"
#include "song/DetachedSong.hxx"
#include "input/InputStream.hxx"
#include "util/RuntimeError.hxx"
#include <FLAC/metadata.h>
static auto
ToSongEnumerator(const char *uri,
const FLAC__StreamMetadata_CueSheet &c,
const unsigned sample_rate,
const FLAC__uint64 total_samples) noexcept
{
std::forward_list<DetachedSong> songs;
auto tail = songs.before_begin();
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 std::unique_ptr<SongEnumerator>
flac_playlist_open_stream(InputStreamPtr &&is)
{
FlacMetadataChain chain;
if (!chain.Read(*is))
throw FormatRuntimeError("Failed to read FLAC metadata: %s",
chain.GetStatusString());
FlacMetadataIterator iterator((FLAC__Metadata_Chain *)chain);
unsigned sample_rate = 0;
FLAC__uint64 total_samples;
do {
auto &block = *iterator.GetBlock();
switch (block.type) {
case FLAC__METADATA_TYPE_STREAMINFO:
sample_rate = block.data.stream_info.sample_rate;
total_samples = block.data.stream_info.total_samples;
break;
case FLAC__METADATA_TYPE_CUESHEET:
if (sample_rate == 0)
break;
return ToSongEnumerator("", block.data.cue_sheet,
sample_rate, total_samples);
default:
break;
}
} while (iterator.Next());
return nullptr;
}
static const char *const flac_playlist_suffixes[] = {
"flac",
nullptr
};
const PlaylistPlugin flac_playlist_plugin =
PlaylistPlugin("flac", flac_playlist_open_stream)
.WithSuffixes(flac_playlist_suffixes);
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