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optimised convolve op

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This commit is contained in:
minjaesong
2023-12-20 23:07:52 +09:00
parent 2cab9723c9
commit b0ae92c64b
2 changed files with 36 additions and 18 deletions
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16
src/net/torvald/terrarum/audio/AudioMixer.kt
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@@ -247,6 +247,8 @@ object AudioMixer: Disposable {
private var testAudioMixRatio = 0.0
private var muteLatched = false
fun update(delta: Float) {
// test the panning
/*musicTrack.getFilter<BinoPan>().let {
@@ -262,14 +264,20 @@ object AudioMixer: Disposable {
if (Gdx.input.isKeyPressed(Input.Keys.UP))
testAudioMixRatio += mixDelta
else if (Gdx.input.isKeyPressed(Input.Keys.DOWN))
if (Gdx.input.isKeyPressed(Input.Keys.DOWN))
testAudioMixRatio -= mixDelta
else if (Gdx.input.isKeyPressed(Input.Keys.NUM_1))
if (Gdx.input.isKeyPressed(Input.Keys.NUM_1))
testAudioMixRatio = -1.0
else if (Gdx.input.isKeyPressed(Input.Keys.NUM_2))
if (Gdx.input.isKeyPressed(Input.Keys.NUM_2))
testAudioMixRatio = 0.0
else if (Gdx.input.isKeyPressed(Input.Keys.NUM_3))
if (Gdx.input.isKeyPressed(Input.Keys.NUM_3))
testAudioMixRatio = 1.0
if (!muteLatched && Gdx.input.isKeyPressed(Input.Keys.NUM_4)) {
AudioMixer.sumBus.volume = 1.0 - AudioMixer.sumBus.volume
muteLatched = true
}
else if (!Gdx.input.isKeyPressed(Input.Keys.NUM_4))
muteLatched = false
testAudioMixRatio = testAudioMixRatio.coerceIn(MaterialCodex["AIIR"].sondrefl.absoluteValue * -1.0, 1.0)

38
src/net/torvald/terrarum/audio/dsp/Convolv.kt
View File

@@ -10,7 +10,8 @@ class Convolv(ir: File, val gain: Float = 1f / 512f): TerrarumAudioFilter() {
val fftLen: Int
private val convFFT: Array<ComplexArray>
private val inbuf: Array<ComplexArray>
// private val inbuf: Array<ComplexArray>
private val sumbuf: ComplexArray
private val BLOCKSIZE = TerrarumAudioMixerTrack.AUDIO_BUFFER_SIZE
@@ -30,7 +31,8 @@ class Convolv(ir: File, val gain: Float = 1f / 512f): TerrarumAudioFilter() {
println("IR '${ir.path}' Sample Count = $sampleCount; FFT Length = $fftLen")
val conv = Array(2) { FloatArray(fftLen) }
inbuf = Array(2) { ComplexArray(FloatArray(fftLen * 2)) }
// inbuf = Array(2) { ComplexArray(FloatArray(fftLen * 2)) }
sumbuf = ComplexArray(FloatArray(fftLen * 2))
ir.inputStream().let {
for (i in 0 until sampleCount) {
@@ -72,10 +74,8 @@ class Convolv(ir: File, val gain: Float = 1f / 512f): TerrarumAudioFilter() {
private val realtime = (BLOCKSIZE / TerrarumAudioMixerTrack.SAMPLING_RATEF * 1000000000L)
private val fftIn = ComplexArray(FloatArray(fftLen * 2))
private val fftMult = ComplexArray(FloatArray(fftLen * 2))
private val fftOut_lL = FloatArray(fftLen) // small l/r: input audio
private val fftOut_rL = FloatArray(fftLen) // large L/R: impulse response
private val fftOut_lR = FloatArray(fftLen)
private val fftOut_rR = FloatArray(fftLen)
private val fftOutL = FloatArray(fftLen)
private val fftOutR = FloatArray(fftLen)
private fun convolve(x: ComplexArray, h: ComplexArray, output: FloatArray) {
FFT.fftInto(x, fftIn)
@@ -91,17 +91,14 @@ class Convolv(ir: File, val gain: Float = 1f / 512f): TerrarumAudioFilter() {
push(gain, inbuf[0], this.inbuf[0])
push(gain, inbuf[1], this.inbuf[1])
pushSum(gain, inbuf[0], inbuf[1], sumbuf)
convolve(this.inbuf[0], convFFT[0], fftOut_lL)
convolve(this.inbuf[1], convFFT[0], fftOut_rL)
convolve(this.inbuf[0], convFFT[1], fftOut_lR)
convolve(this.inbuf[1], convFFT[1], fftOut_rR)
convolve(sumbuf, convFFT[0], fftOutL)
convolve(sumbuf, convFFT[1], fftOutR)
for (i in 0 until BLOCKSIZE) {
outbuf[0][i] = fftOut_lL[fftLen - BLOCKSIZE + i] + fftOut_rL[fftLen - BLOCKSIZE + i]
outbuf[1][i] = fftOut_rR[fftLen - BLOCKSIZE + i] + fftOut_lR[fftLen - BLOCKSIZE + i]
outbuf[0][i] = fftOutL[fftLen - BLOCKSIZE + i]
outbuf[1][i] = fftOutR[fftLen - BLOCKSIZE + i]
}
@@ -113,7 +110,9 @@ class Convolv(ir: File, val gain: Float = 1f / 512f): TerrarumAudioFilter() {
fun push(gain: Float, samples: FloatArray, buf: ComplexArray) {
// shift numbers
System.arraycopy(buf.reim, samples.size * 2, buf.reim, 0, buf.reim.size - samples.size * 2)
// fill in the shifted area
val baseI = buf.reim.size - samples.size * 2
samples.forEachIndexed { index, fl ->
buf.reim[baseI + index * 2 + 0] = fl * gain
@@ -121,4 +120,15 @@ class Convolv(ir: File, val gain: Float = 1f / 512f): TerrarumAudioFilter() {
}
}
fun pushSum(gain: Float, sampleL: FloatArray, sampleR: FloatArray, buf: ComplexArray) {
// shift numbers
System.arraycopy(buf.reim, sampleL.size * 2, buf.reim, 0, buf.reim.size - sampleL.size * 2)
// fill in the shifted area
val baseI = buf.reim.size - sampleL.size * 2
for (index in sampleL.indices) {
buf.reim[baseI + index * 2 + 0] = (sampleL[index] + sampleR[index]) * gain
buf.reim[baseI + index * 2 + 1] = 0f
}
}
}