Initial project import

open/audio/audio.fv

@@ -0,0 +1,18 @@
+// Standalone waveform helpers. Apache-2.0 licensed.
+module agila_open_audio
+
+import math
+
+pub fn sine_wave(sample_rate int, frequency f64, duration f64, amplitude f64) []i16 {
+    if sample_rate <= 0 || frequency <= 0 || duration <= 0 {
+        return []i16{}
+    }
+    count := int(f64(sample_rate) * duration)
+    mut samples := []i16{cap: count}
+    for i in 0 .. count {
+        t := f64(i) / f64(sample_rate)
+        value := math.sin(2.0 * math.pi * frequency * t) * amplitude
+        samples << i16(value)
+    }
+    return samples
+}