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playlist/flac: use class MemorySongEnumerator

This commit is contained in:
Max Kellermann 2019-08-15 09:45:03 +02:00
parent ccffff9870
commit dcb07e6ed4
1 changed files with 28 additions and 55 deletions
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83
src/playlist/plugins/FlacPlaylistPlugin.cxx
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@ -25,66 +25,15 @@
#include "FlacPlaylistPlugin.hxx"
#include "../PlaylistPlugin.hxx"
#include "../SongEnumerator.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>
class FlacPlaylist final : public SongEnumerator {
const std::string 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) noexcept
:uri(_uri), cuesheet(_cuesheet),
sample_rate(streaminfo.data.stream_info.sample_rate),
total_samples(streaminfo.data.stream_info.total_samples) {
}
~FlacPlaylist() noexcept override {
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)
@ -101,14 +50,38 @@ flac_playlist_open_uri(const char *uri,
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) {
FLAC__metadata_object_delete(cuesheet);
return nullptr;
}
return std::make_unique<FlacPlaylist>(uri, cuesheet, streaminfo);
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[] = {