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feat: replay gain (normalize volume)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| import 'dart:math' as math; | ||
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|
||
| class ReplayGainData { | ||
| final double? trackGain, albumGain; | ||
| final double? trackPeak, albumPeak; | ||
| const ReplayGainData({ | ||
| required this.trackGain, | ||
| required this.trackPeak, | ||
| required this.albumGain, | ||
| required this.albumPeak, | ||
| }); | ||
|
|
||
| double? calculateGainAsVolume({double withRespectiveVolume = 0.75}) { | ||
| final gainFinal = trackGain ?? albumGain; | ||
| if (gainFinal == null) return null; | ||
| final gainLinear = math.pow(10, gainFinal / 20).clamp(0.1, 1.0); | ||
| return gainLinear * withRespectiveVolume; | ||
| } | ||
|
|
||
| static ReplayGainData? fromAndroidMap(Map map) { | ||
| double? trackGainDB = ((map['replaygain_track_gain'] ?? map['REPLAYGAIN_TRACK_GAIN']) as String?)?._parseGainValue(); // "-0.515000 dB" | ||
| double? albumGainDB = ((map['replaygain_album_gain'] ?? map['REPLAYGAIN_ALBUM_GAIN']) as String?)?._parseGainValue(); // "+0.040000 dB" | ||
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| trackGainDB ??= ((map['r128_track_gain'] ?? map['R128_TRACK_GAIN']) as String?)?._parseGainValueR128(); | ||
| albumGainDB ??= ((map['r128_album_gain'] ?? map['R128_ALBUM_GAIN']) as String?)?._parseGainValueR128(); | ||
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| final trackPeak = ((map['replaygain_track_peak'] ?? map['REPLAYGAIN_TRACK_PEAK']) as String?)?._parsePeakValue(); | ||
| final albumPeak = ((map['replaygain_album_peak'] ?? map['REPLAYGAIN_ALBUM_PEAK']) as String?)?._parsePeakValue(); | ||
|
|
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| final data = ReplayGainData( | ||
| trackGain: trackGainDB, | ||
| trackPeak: trackPeak, | ||
| albumGain: albumGainDB, | ||
| albumPeak: albumPeak, | ||
| ); | ||
| if (data.trackGain == null && data.trackPeak == null && data.albumGain == null && data.albumPeak == null) return null; | ||
| return data; | ||
| } | ||
|
|
||
| factory ReplayGainData.fromMap(Map<String, dynamic> map) { | ||
| return ReplayGainData( | ||
| trackGain: map['tg'], | ||
| trackPeak: map['tp'], | ||
| albumGain: map['ag'], | ||
| albumPeak: map['ap'], | ||
| ); | ||
| } | ||
|
|
||
| Map<String, dynamic> toMap() { | ||
| return <String, dynamic>{ | ||
| "tg": trackGain, | ||
| "tp": trackPeak, | ||
| "ag": albumGain, | ||
| "ap": albumPeak, | ||
| }; | ||
| } | ||
| } | ||
|
|
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| extension _GainParser on String? { | ||
| double? _parseGainValueR128() { | ||
| final parsed = _parseGainValue(); | ||
| return parsed == null ? null : (parsed / 256) + 5; | ||
| } | ||
|
|
||
| double? _parseGainValue() { | ||
| var text = this; | ||
| return text == null ? null : double.tryParse(text.replaceFirst(RegExp(r'[^\d.-]'), '')) ?? double.tryParse(text.split(' ').first); | ||
| } | ||
|
|
||
| double? _parsePeakValue() { | ||
| var text = this; | ||
| return text == null ? null : double.tryParse(text); | ||
| } | ||
| } |
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