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fix: periodic ticking on the resampler

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minjaesong
2023-12-14 01:10:27 +09:00
parent b79232cd9b
commit be35d1b4e0
1 changed files with 23 additions and 29 deletions
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52
src/net/torvald/terrarum/audio/AudioProcessBuf.kt
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@@ -1,7 +1,6 @@
package net.torvald.terrarum.audio
import com.jme3.math.FastMath
import net.torvald.terrarum.App.printdbg
import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.AUDIO_BUFFER_SIZE
import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.SAMPLING_RATE
import net.torvald.terrarum.ceilToInt
@@ -10,7 +9,6 @@ import net.torvald.terrarum.serialise.toUint
import org.dyn4j.Epsilon
import kotlin.math.PI
import kotlin.math.absoluteValue
import kotlin.math.roundToInt
import kotlin.math.sin
private data class Frac(var nom: Int, val denom: Int) {
@@ -32,7 +30,7 @@ class AudioProcessBuf(inputSamplingRate: Int, val audioReadFun: (ByteArray) -> I
companion object {
private val epsilon: Double = Epsilon.E
private val TAPS = 8 // 2*a tap lanczos intp. Lower = greater artefacts
private val TAPS = 4 // 2*a tap lanczos intp. Lower = greater artefacts
fun L(x: Double): Double = if (x.absoluteValue < epsilon)
1.0
@@ -49,11 +47,11 @@ class AudioProcessBuf(inputSamplingRate: Int, val audioReadFun: (ByteArray) -> I
init {
val bl = arrayOf(
1152,1380,1815,1792,2304,2634,3500,3456,4608,5141,6870,6912,
1280,1505,1943,1920,2304,2759,3630,3584,4608,5267,7000,6912,
1536,1756,2198,2176,2560,3010,3886,3840,4608,5518,7260,7168,
2048,2257,2709,2688,3072,3511,4397,4352,5120,6019,7772,7680,
4096,4513,5419,5376,6144,7022,8794,8704,10240,12038,15544,15360
1152,1380,1814,1792,2304,2634,3502,3456,4608,5141,6874,6912,
1280,1508,1942,1920,2304,2762,3630,3584,4608,5267,7004,6912,
1536,1764,2198,2176,2560,3018,3886,3840,4608,5519,7260,7168,
2048,2276,2710,2688,3072,3530,4398,4352,5120,6023,7772,7680,
4096,4554,5421,5376,6144,7056,8796,8704,10240,12078,15544,15360
)
arrayOf(48000,44100,32768,32000,24000,22050,16384,16000,12000,11025,8192,8000).forEachIndexed { ri, r ->
@@ -75,28 +73,26 @@ class AudioProcessBuf(inputSamplingRate: Int, val audioReadFun: (ByteArray) -> I
private val PADSIZE = TAPS + 1
private fun resampleBlock(innL: FloatArray, innR: FloatArray, outL: FloatArray, outR: FloatArray, outSampleCount: Int) {
fun getInnL(i: Int) = innL[i + PADSIZE]
fun getInnR(i: Int) = innR[i + PADSIZE]
for (sampleIdx in 0 until outSampleCount) {
val x = fPhaseL.toDouble() + q * sampleIdx
var sx = 0.0
for (i in x.floorToInt() - TAPS + 1..x.floorToInt() + TAPS) {
sx += getInnL(i) * L(x - i)
}
outL[sampleIdx] = sx.toFloat()
}
fPhaseL.nom = ((fPhaseL.toDouble() + q * outSampleCount) * denom).roundToInt() % denom
val t = sampleIdx.toDouble() * q
val leftBound = maxOf(0, (t - TAPS + 1).floorToInt())
val rightBound = minOf(innL.size - 1, (t + TAPS).ceilToInt())
for (sampleIdx in 0 until outSampleCount) {
val x = fPhaseR.toDouble() + q * sampleIdx
var sx = 0.0
for (i in x.floorToInt() - TAPS + 1..x.floorToInt() + TAPS) {
sx += getInnR(i) * L(x - i)
var akkuL = 0.0
var akkuR = 0.0
var weightedSum = 0.0
for (j in leftBound..rightBound) {
val w = L(t - j.toDouble())
akkuL += innL[j] * w
akkuR += innR[j] * w
weightedSum += w
}
outR[sampleIdx] = sx.toFloat()
outL[sampleIdx] = (akkuL / weightedSum).toFloat()
outR[sampleIdx] = (akkuR / weightedSum).toFloat()
}
fPhaseR.nom = ((fPhaseR.toDouble() + q * outSampleCount) * denom).roundToInt() % denom
}
var validSamplesInBuf = 0
@@ -110,8 +106,6 @@ class AudioProcessBuf(inputSamplingRate: Int, val audioReadFun: (ByteArray) -> I
private val finL = FloatArray(fetchSize + 2 * PADSIZE)
private val finR = FloatArray(fetchSize + 2 * PADSIZE)
private var fPhaseL = Frac(preDelay, denom)
private var fPhaseR = Frac(preDelay, denom)
private val fmidL = FloatArray((fetchSize / q + 1.0).toInt())
private val fmidR = FloatArray((fetchSize / q + 1.0).toInt())
private val foutL = FloatArray(internalBufferSize) // 640 for (44100, 48000), 512 for (48000, 48000) with BUFFER_SIZE = 512 * 4
@@ -125,7 +119,7 @@ class AudioProcessBuf(inputSamplingRate: Int, val audioReadFun: (ByteArray) -> I
fun fetchBytes() {
val readCount = if (validSamplesInBuf < BS) fetchSize else 0
val writeCount = (readCount / q + fPhaseL.toDouble()).toInt()
val writeCount = (readCount / q).toInt()
fun getFromReadBuf(i: Int, bytesRead: Int) = if (i < bytesRead) readBuf[i].toUint() else 0