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cheap reverb filter

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This commit is contained in:
minjaesong
2023-11-23 23:34:05 +09:00
parent e0257dfe3d
commit 402b0a8414
2 changed files with 48 additions and 10 deletions
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3
src/net/torvald/terrarum/audio/AudioMixer.kt
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@@ -102,6 +102,7 @@ object AudioMixer: Disposable {
init {
// musicTrack.filters[0] = BinoPan((Math.random() * 2.0 - 1.0).toFloat())
// musicTrack.filters[1] = Reverb(25f, 1f, 1000f)
masterTrack.filters[0] = SoftClp
masterTrack.filters[1] = Buffer
@@ -110,7 +111,7 @@ object AudioMixer: Disposable {
fadeBus.addSidechainInput(musicTrack, 1.0)
fadeBus.addSidechainInput(ambientTrack, 1.0)
fadeBus.addSidechainInput(sfxMixTrack, 1.0)
fadeBus.filters[0] = Lowpass(SAMPLING_RATE / 2f, SAMPLING_RATE)
fadeBus.filters[0] = Lowpass(SAMPLING_RATE / 2f)
masterTrack.addSidechainInput(fadeBus, 1.0)
masterTrack.addSidechainInput(guiTrack, 1.0)

55
src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
View File

@@ -42,7 +42,7 @@ object SoftClp : TerrarumAudioFilter() {
val out = outbuf1[ch]
for (i in inn.indices) {
val u = inn[i]
val u = inn[i] * 0.95f
val v = tanh(u)
val diff = (v.absoluteValue / u.absoluteValue)
out[i] = v
@@ -90,7 +90,7 @@ class Scope : TerrarumAudioFilter() {
}
class Lowpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
class Lowpass(cutoff0: Float): TerrarumAudioFilter() {
var cutoff = cutoff0.toDouble(); private set
private var alpha: Float = 0f
@@ -100,9 +100,8 @@ class Lowpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
}
fun setCutoff(cutoff: Float) {
// println("LP Cutoff: $cutoff")
val RC: Float = 1f / (cutoff * FastMath.TWO_PI)
val dt: Float = 1f / rate
val dt: Float = 1f / SAMPLING_RATEF
alpha = dt / (RC + dt)
this.cutoff = cutoff.toDouble()
}
@@ -110,7 +109,7 @@ class Lowpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
fun setCutoff(cutoff: Double) {
// println("LP Cutoff: $cutoff")
val RC: Double = 1.0 / (cutoff * Math.PI * 2.0)
val dt: Double = 1.0 / rate
val dt: Double = 1.0 / SAMPLING_RATEF
alpha = (dt / (RC + dt)).toFloat()
this.cutoff = cutoff
}
@@ -131,7 +130,7 @@ class Lowpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
}
class Highpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
class Highpass(cutoff0: Float): TerrarumAudioFilter() {
var cutoff = cutoff0.toDouble(); private set
private var alpha: Float = 0f
@@ -143,7 +142,7 @@ class Highpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
fun setCutoff(cutoff: Float) {
// println("LP Cutoff: $cutoff")
val RC: Float = 1f / (cutoff * FastMath.TWO_PI)
val dt: Float = 1f / rate
val dt: Float = 1f / SAMPLING_RATEF
alpha = dt / (RC + dt)
this.cutoff = cutoff.toDouble()
}
@@ -151,7 +150,7 @@ class Highpass(cutoff0: Float, val rate: Int): TerrarumAudioFilter() {
fun setCutoff(cutoff: Double) {
// println("LP Cutoff: $cutoff")
val RC: Double = 1.0 / (cutoff * Math.PI * 2.0)
val dt: Double = 1.0 / rate
val dt: Double = 1.0 / SAMPLING_RATEF
alpha = (RC / (RC + dt)).toFloat()
this.cutoff = cutoff
}
@@ -248,4 +247,42 @@ class Bitcrush(var steps: Int, var inputGain: Float = 1f): TerrarumAudioFilter()
}
}
}
}
}
class Reverb(val delayMS: Float, var decay: Float, var lowpass: Float): TerrarumAudioFilter() {
private var delay = (SAMPLING_RATEF * delayMS / 1000f).roundToInt()
private val buf = Array<FloatArray>(2) { FloatArray(delay) }
private fun unshift(sample: Float, buf: FloatArray) {
for (i in delay - 1 downTo 1) {
buf[i] = buf[i - 1]
}
buf[0] = sample
}
override fun thru(inbuf0: List<FloatArray>, inbuf1: List<FloatArray>, outbuf0: List<FloatArray>, outbuf1: List<FloatArray>) {
val RC: Float = 1f / (lowpass * FastMath.TWO_PI)
val dt: Float = 1f / SAMPLING_RATEF
val alpha = dt / (RC + dt)
for (ch in 0 until outbuf1.size) {
for (i in 0 until BUFFER_SIZE / 4) {
val in1 = inbuf1[ch][i]
val in2 = buf[ch][delay - 2]
val in3 = buf[ch][delay - 1]
val dek1 = 1f / (1f + decay)
val dek2 = decay / (1f + decay)
val out = in1 * dek1 + (in2 + alpha * (in3 - in2)) * dek2
unshift(out, buf[ch])
outbuf1[ch][i] = out
}
}
}
}