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doppler effect

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minjaesong
2024-01-21 03:23:25 +09:00
parent f34a6b7c9f
commit 3da37408a2
4 changed files with 34 additions and 12 deletions
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4
src/net/torvald/terrarum/audio/AudioProcessBuf.kt
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@@ -113,8 +113,8 @@ class AudioProcessBuf(val inputSamplingRate: Int, val audioReadFun: (ByteArray)
private val finL = FloatArray(fetchSize + 2 * PADSIZE)
private val finR = FloatArray(fetchSize + 2 * PADSIZE)
private val fmidL = FloatArray((fetchSize / q + 1.0).toInt())
private val fmidR = FloatArray((fetchSize / q + 1.0).toInt())
private val fmidL = FloatArray((fetchSize / q + 1.0).toInt() * 2)
private val fmidR = FloatArray((fetchSize / q + 1.0).toInt() * 2)
private val foutL = FloatArray(internalBufferSize) // 640 for (44100, 48000), 512 for (48000, 48000) with BUFFER_SIZE = 512 * 4
private val foutR = FloatArray(internalBufferSize) // 640 for (44100, 48000), 512 for (48000, 48000) with BUFFER_SIZE = 512 * 4
private val readBuf = ByteArray(fetchSize * 4)

22
src/net/torvald/terrarum/audio/MixerTrackProcessor.kt
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@@ -2,16 +2,16 @@ package net.torvald.terrarum.audio
import com.badlogic.gdx.utils.Queue
import net.torvald.reflection.forceInvoke
import net.torvald.terrarum.App
import net.torvald.terrarum.*
import net.torvald.terrarum.audio.AudioMixer.Companion.SPEED_OF_SOUND_AIR
import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.SAMPLING_RATE
import net.torvald.terrarum.audio.TerrarumAudioMixerTrack.Companion.SAMPLING_RATED
import net.torvald.terrarum.audio.dsp.BinoPan
import net.torvald.terrarum.audio.dsp.Lowpass
import net.torvald.terrarum.audio.dsp.NullFilter
import net.torvald.terrarum.distBetweenActors
import net.torvald.terrarum.gameactors.ActorWithBody
import net.torvald.terrarum.relativeXposition
import net.torvald.terrarum.sqr
import net.torvald.terrarum.gameactors.ActorWithBody.Companion.GAME_TO_SI_VELO
import org.dyn4j.geometry.Vector2
import kotlin.math.*
/**
@@ -136,7 +136,19 @@ class MixerTrackProcessor(bufferSize: Int, val rate: Int, val track: TerrarumAud
(SAMPLING_RATED*0.5) / (24.0 * (distFromActor / distFalloff).sqr() + 1.0)
)
// printdbg("dist=$distFromActor\tvol=${fullscaleToDecibels(vol)}\tcutoff=${(track.filters[1] as Lowpass).cutoff}")
val sourceVec = (track.trackingTarget as ActorWithBody).let { it.externalV + (it.controllerV ?: Vector2()) }
val listenerVec = App.audioMixer.actorNowPlaying!!.let { it.externalV + (it.controllerV ?: Vector2()) }
val distFromActorNext = distBetweenPoints(
App.audioMixer.actorNowPlaying!!.centrePosVector + listenerVec,
(track.trackingTarget as ActorWithBody).centrePosVector + sourceVec
)
val isApproaching = if (distFromActorNext <= distFromActor) 1.0 else -1.0
val relativeSpeed = (sourceVec - listenerVec).magnitude * GAME_TO_SI_VELO * isApproaching
val dopplerFactor = (SPEED_OF_SOUND_AIR + relativeSpeed) / SPEED_OF_SOUND_AIR // >1: speedup, <1: speeddown
track.processor.streamBuf?.playbackSpeed = dopplerFactor.toFloat()
// printdbg("dist=$distFromActor\tvol=${fullscaleToDecibels(vol)}\tcutoff=${(track.filters[1] as Lowpass).cutoff}\tdopplerFactor=$dopplerFactor")
}
}
else {