Added Split, ReplayGain filter

audio/replaygain/filter.go

@@ -0,0 +1,15 @@
+package replaygain
+
+import (
+	"git.gammaspectra.live/S.O.N.G/Kirika/audio"
+	"math"
+)
+
+//NewReplayGainFilter Creates a VolumeFilter applying calculated ReplayGain values, pre amplifying by preAmp. Values are in dB
+func NewReplayGainFilter(gain, peak, preAmp float64) audio.VolumeFilter {
+	volume := math.Pow(10, (gain+preAmp)/20)
+	//prevent clipping
+	volume = math.Min(volume, 1/peak)
+
+	return audio.NewVolumeFilter(float32(volume))
+}

audio/source.go

@@ -5,3 +5,27 @@ type Source struct {
 	Channels   int
 	Blocks     chan []float32
 }
+
+func (s Source) Split(n int) (sources []Source) {
+	sources = make([]Source, n)
+	for i := range sources {
+		sources[i] = s
+		sources[i].Blocks = make(chan []float32, cap(s.Blocks))
+	}
+
+	go func() {
+		defer func() {
+			for i := range sources {
+				close(sources[i].Blocks)
+			}
+		}()
+
+		for block := range s.Blocks {
+			for i := range sources {
+				sources[i].Blocks <- block
+			}
+		}
+	}()
+
+	return
+}