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Put volume control on a loudness scale rather than amplitude

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小太
2016-01-24 00:34:06 +11:00
parent cbb0c5f999
commit c2b015a155
1 changed files with 9 additions and 3 deletions
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12
js/battle.js
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@@ -139,16 +139,22 @@ var BattleSoundLibrary = (function () {
if (this.bgm) this.bgm.play();
}
};
function loudnessPercentToAmplitudePercent(loudnessPercent) {
// 10 dB is perceived as approximately twice as loud
var decibels = 10 * Math.log(loudnessPercent / 100) / Math.log(2);
return Math.pow(10, decibels / 20) * 100;
}
BattleSoundLibrary.prototype.setBgmVolume = function (bgmVolume) {
this.bgmVolume = bgmVolume;
this.bgmVolume = loudnessPercentToAmplitudePercent(bgmVolume);
if (this.bgm) {
try {
this.bgm.setVolume(bgmVolume);
this.bgm.setVolume(this.bgmVolume);
} catch (e) {}
}
};
BattleSoundLibrary.prototype.setEffectVolume = function (effectVolume) {
this.effectVolume = effectVolume;
this.effectVolume = loudnessPercentToAmplitudePercent(effectVolume);
};
return BattleSoundLibrary;