Kendall Garner
32 lines
714 B
JavaScript
32 lines
714 B
JavaScript
const calculateReplayGain = (preAmp, gain, peak) => {
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if (gain === undefined || peak === undefined) {
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return 1
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}
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// https://wiki.hydrogenaud.io/index.php?title=ReplayGain_1.0_specification§ion=19
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// Normalized to max gain
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return Math.min(10 ** ((gain + preAmp) / 20), 1 / peak)
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}
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export const calculateGain = (gainInfo, song) => {
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switch (gainInfo.gainMode) {
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case 'album': {
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return calculateReplayGain(
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gainInfo.preAmp,
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song.rgAlbumGain,
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song.rgAlbumPeak,
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)
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}
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case 'track': {
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return calculateReplayGain(
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gainInfo.preAmp,
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song.rgTrackGain,
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song.rgTrackPeak,
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)
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}
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default: {
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return 1
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}
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}
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}
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