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reverb filter

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This commit is contained in:
minjaesong
2023-11-25 00:17:29 +09:00
parent f5078d79f9
commit 71a8d6d266
2 changed files with 13 additions and 13 deletions
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2
src/net/torvald/terrarum/audio/AudioMixer.kt
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@@ -102,7 +102,7 @@ object AudioMixer: Disposable {
init {
// musicTrack.filters[0] = BinoPan((Math.random() * 2.0 - 1.0).toFloat())
// musicTrack.filters[1] = Reverb(25f, 1f, 1000f)
musicTrack.filters[1] = Reverb(36f, 0.9f, 100f)
masterTrack.filters[0] = SoftClp
masterTrack.filters[1] = Buffer

24
src/net/torvald/terrarum/audio/TerrarumAudioFilter.kt
View File

@@ -238,7 +238,7 @@ class BinoPan(var pan: Float, var earDist: Float = 0.18f): TerrarumAudioFilter()
class Bitcrush(var steps: Int, var inputGain: Float = 1f): TerrarumAudioFilter() {
override fun thru(inbuf0: List<FloatArray>, inbuf1: List<FloatArray>, outbuf0: List<FloatArray>, outbuf1: List<FloatArray>) {
for (ch in 0 until outbuf1.size) {
for (ch in outbuf1.indices) {
for (i in 0 until BUFFER_SIZE / 4) {
val inn = ((inbuf1[ch][i] * inputGain).coerceIn(-1f, 1f) + 1f) / 2f // 0f..1f
val stepped = (inn * (steps - 1)).roundToFloat() / (steps - 1)
@@ -249,35 +249,35 @@ class Bitcrush(var steps: Int, var inputGain: Float = 1f): TerrarumAudioFilter()
}
}
class Reverb(val delayMS: Float, var decay: Float, var lowpass: Float): TerrarumAudioFilter() {
class Reverb(val delayMS: Float, var feedback: Float, var lowpass: Float): TerrarumAudioFilter() {
private var delay = (SAMPLING_RATEF * delayMS / 1000f).roundToInt()
private val buf = Array<FloatArray>(2) { FloatArray(delay) }
private val bufSize = delay
private val buf = Array<FloatArray>(2) { FloatArray(bufSize) }
private fun unshift(sample: Float, buf: FloatArray) {
for (i in delay - 1 downTo 1) {
for (i in bufSize - 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 (ch in outbuf1.indices) {
for (i in 0 until BUFFER_SIZE / 4) {
// TODO lowpass is not really working
val in1 = inbuf1[ch][i]
val in2 = buf[ch][delay - 2]
val in3 = buf[ch][delay - 1]
val rv1 = buf[ch][delay - 1]
val rv0 = buf[ch][delay - 2]
val dek1 = 1f / (1f + decay)
val dek2 = decay / (1f + decay)
val reverb = (rv1 + alpha * (rv0 - rv1))
val out = in1 * dek1 + (in2 + alpha * (in3 - in2)) * dek2
val out = in1 - reverb * feedback
unshift(out, buf[ch])