init commit

internal/audio/waveform.go

@@ -0,0 +1,36 @@
+package audio
+
+// WaveformData holds pre-computed waveform samples
+type WaveformData struct {
+	Samples   []float64
+	MaxValue  float64
+}
+
+// NewWaveformData creates waveform data from raw samples
+func NewWaveformData(samples []float64) *WaveformData {
+	wd := &WaveformData{
+		Samples: samples,
+	}
+
+	// Find max value for normalization
+	for _, s := range samples {
+		if s > wd.MaxValue {
+			wd.MaxValue = s
+		}
+	}
+
+	if wd.MaxValue == 0 {
+		wd.MaxValue = 1 // Avoid division by zero
+	}
+
+	return wd
+}
+
+// Normalized returns samples normalized to 0-1 range
+func (w *WaveformData) Normalized() []float64 {
+	normalized := make([]float64, len(w.Samples))
+	for i, s := range w.Samples {
+		normalized[i] = s / w.MaxValue
+	}
+	return normalized
+}