Kirika/audio/replaygain/filter.go

package replaygain

import (
	"git.gammaspectra.live/S.O.N.G/Kirika/audio/filter"
	"math"
)

// NewReplayGainFilter Creates a VolumeFilter applying calculated ReplayGain values, pre amplifying by preAmp. Values are in dB
func NewReplayGainFilter(gain, peak, preAmp float64) filter.VolumeFilter {
	volume := math.Pow(10, (gain+preAmp)/20)
	//prevent clipping
	volume = math.Min(volume, 1/peak)

	return filter.NewVolumeFilter(volume)
}