109 lines
3.0 KiB
C++
109 lines
3.0 KiB
C++
/*
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* Copyright 2003-2022 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/** \file
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*
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* Playlist plugin that reads embedded cue sheets from the "CUESHEET"
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* tag of a music file.
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*/
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#include "FlacPlaylistPlugin.hxx"
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#include "../PlaylistPlugin.hxx"
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#include "../MemorySongEnumerator.hxx"
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#include "lib/xiph/FlacMetadataChain.hxx"
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#include "lib/xiph/FlacMetadataIterator.hxx"
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#include "lib/fmt/RuntimeError.hxx"
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#include "song/DetachedSong.hxx"
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#include "input/InputStream.hxx"
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#include <FLAC/metadata.h>
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static auto
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ToSongEnumerator(const char *uri,
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const FLAC__StreamMetadata_CueSheet &c,
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const unsigned sample_rate,
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const FLAC__uint64 total_samples) noexcept
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{
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std::forward_list<DetachedSong> songs;
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auto tail = songs.before_begin();
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for (unsigned i = 0; i < c.num_tracks; ++i) {
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const auto &track = c.tracks[i];
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if (track.type != 0)
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continue;
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const FLAC__uint64 start = track.offset;
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const FLAC__uint64 end = i + 1 < c.num_tracks
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? c.tracks[i + 1].offset
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: total_samples;
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tail = songs.emplace_after(tail, uri);
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auto &song = *tail;
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song.SetStartTime(SongTime::FromScale(start, sample_rate));
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song.SetEndTime(SongTime::FromScale(end, sample_rate));
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}
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return std::make_unique<MemorySongEnumerator>(std::move(songs));
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}
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static std::unique_ptr<SongEnumerator>
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flac_playlist_open_stream(InputStreamPtr &&is)
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{
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FlacMetadataChain chain;
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if (!chain.Read(*is))
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throw FmtRuntimeError("Failed to read FLAC metadata: {}",
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chain.GetStatusString());
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FlacMetadataIterator iterator((FLAC__Metadata_Chain *)chain);
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unsigned sample_rate = 0;
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FLAC__uint64 total_samples;
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do {
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auto &block = *iterator.GetBlock();
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switch (block.type) {
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case FLAC__METADATA_TYPE_STREAMINFO:
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sample_rate = block.data.stream_info.sample_rate;
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total_samples = block.data.stream_info.total_samples;
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break;
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case FLAC__METADATA_TYPE_CUESHEET:
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if (sample_rate == 0)
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break;
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return ToSongEnumerator("", block.data.cue_sheet,
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sample_rate, total_samples);
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default:
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break;
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}
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} while (iterator.Next());
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return nullptr;
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}
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static constexpr const char *flac_playlist_suffixes[] = {
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"flac",
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nullptr
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};
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const PlaylistPlugin flac_playlist_plugin =
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PlaylistPlugin("flac", flac_playlist_open_stream)
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.WithSuffixes(flac_playlist_suffixes);
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