test code might shelf later lol

src/net/torvald/terrarum/audio/AudioProcessBuf.kt

@@ -0,0 +1,36 @@
+package net.torvald.terrarum.audio
+
+import net.torvald.terrarum.serialise.toUint
+
+/**
+ * Audio is assumed to be 16 bits
+ *
+ * Created by minjaesong on 2023-11-17.
+ */
+class AudioProcessBuf(val size: Int) {
+
+    var buf0 = ByteArray(size); private set
+    var buf1 = ByteArray(size); private set
+
+    var fbuf0 = FloatArray(size / 2); private set
+    var fbuf1 = FloatArray(size / 2); private set
+
+    fun shift(): ByteArray {
+        buf0 = buf1
+        buf1 = ByteArray(size)
+
+        fbuf0 = fbuf1
+        fbuf1 = FloatArray(size / 2) {
+            val i16 = (buf1[4*it].toUint() or buf1[4*it+1].toUint().shl(8)).toShort()
+            i16 / 32767f
+        }
+
+        return buf1
+    }
+
+    fun getL0() = FloatArray(size / 4) { fbuf0[2*it] }
+    fun getR0() = FloatArray(size / 4) { fbuf0[2*it+1] }
+    fun getL1() = FloatArray(size / 4) { fbuf1[2*it] }
+    fun getR1() = FloatArray(size / 4) { fbuf1[2*it+1] }
+
+}