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binopan: stereo src

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minjaesong
2024-01-10 23:21:55 +09:00
parent 0881d1dca3
commit 6e32647e6d
1 changed files with 20 additions and 7 deletions
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27
src/net/torvald/terrarum/audio/dsp/BinoPan.kt
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@@ -5,8 +5,8 @@ import com.jme3.math.FastMath
import net.torvald.terrarum.App
import net.torvald.terrarum.audio.AudioMixer
import net.torvald.terrarum.audio.TerrarumAudioMixerTrack
import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.AUDIO_BUFFER_SIZE
import net.torvald.terrarum.audio.decibelsToFullscale
import net.torvald.terrarum.ui.BasicDebugInfoWindow
import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.COL_METER_GRAD
import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.COL_METER_GRAD2
import net.torvald.terrarum.ui.BasicDebugInfoWindow.Companion.FILTER_NAME_ACTIVE
@@ -17,8 +17,6 @@ import kotlin.math.absoluteValue
import kotlin.math.roundToInt
/**
* The input audio must be monaural
*
* @param pan -1 for far-left, 0 for centre, 1 for far-right
* @param soundSpeed speed of the sound in meters per seconds
* @param earDist distance between ears in meters
@@ -27,7 +25,11 @@ class BinoPan(var pan: Float, var earDist: Float = 0.18f): TerrarumAudioFilter()
private val PANNING_CONST = 3.0 // 3dB panning rule
private val delayLine = FloatArray(TerrarumAudioMixerTrack.AUDIO_BUFFER_SIZE)
private val panUp = decibelsToFullscale(PANNING_CONST / 2.0).toFloat()
private val panDn = decibelsToFullscale(-PANNING_CONST / 2.0).toFloat()
private val delayLineL = FloatArray(AUDIO_BUFFER_SIZE)
private val delayLineR = FloatArray(AUDIO_BUFFER_SIZE)
private fun getFrom(index: Float, buf0: FloatArray, buf1: FloatArray): Float {
val index = index.toInt() // TODO resampling
@@ -38,6 +40,10 @@ class BinoPan(var pan: Float, var earDist: Float = 0.18f): TerrarumAudioFilter()
private val delays = arrayOf(0f, 0f)
private val mults = arrayOf(1f, 1f)
private val outLs = Array(2) { FloatArray(AUDIO_BUFFER_SIZE) }
private val outRs = Array(2) { FloatArray(AUDIO_BUFFER_SIZE) }
override fun thru(inbuf: List<FloatArray>, outbuf: List<FloatArray>) {
val angle = pan * 1.5707963f
val timeDiffMax = earDist / AudioMixer.SPEED_OF_SOUND * TerrarumAudioMixerTrack.SAMPLING_RATEF
@@ -65,12 +71,19 @@ class BinoPan(var pan: Float, var earDist: Float = 0.18f): TerrarumAudioFilter()
}
for (ch in 0..1) {
for (i in 0 until TerrarumAudioMixerTrack.AUDIO_BUFFER_SIZE) {
outbuf[ch][i] = getFrom(i - delays[ch], delayLine, inbuf[0]) * mults[ch]
for (i in 0 until AUDIO_BUFFER_SIZE) {
outLs[ch][i] = getFrom(i - delays[ch], delayLineL, inbuf[0]) * mults[ch]
outRs[ch][i] = getFrom(i - delays[ch], delayLineR, inbuf[1]) * mults[ch]
}
}
push(inbuf[0], delayLine)
for (i in 0 until AUDIO_BUFFER_SIZE) {
outbuf[0][i] = (outLs[0][i] * panUp + outLs[1][i] * panDn) / 2f
outbuf[1][i] = (outRs[0][i] * panDn + outRs[1][i] * panUp) / 2f
}
push(inbuf[0], delayLineL)
push(inbuf[1], delayLineR)
}
override fun drawDebugView(batch: SpriteBatch, x: Int, y: Int) {