feat: Implement TeamSpeak 3 client with connection management, event handling, and audio support.

pkg/audio/level.go

@@ -0,0 +1,100 @@
+package audio
+
+import (
+	"math"
+)
+
+// CalculateRMSLevel calculates the RMS level of PCM samples and returns 0-100
+func CalculateRMSLevel(samples []int16) int {
+	if len(samples) == 0 {
+		return 0
+	}
+
+	var sum float64
+	for _, s := range samples {
+		sum += float64(s) * float64(s)
+	}
+
+	rms := math.Sqrt(sum / float64(len(samples)))
+	// Normalize to 0-100 (max int16 is 32767)
+	level := int(rms / 32767.0 * 100.0)
+	if level > 100 {
+		level = 100
+	}
+	return level
+}
+
+// CalculatePeakLevel returns the peak level of PCM samples as 0-100
+func CalculatePeakLevel(samples []int16) int {
+	if len(samples) == 0 {
+		return 0
+	}
+
+	var peak int16
+	for _, s := range samples {
+		if s < 0 {
+			s = -s
+		}
+		if s > peak {
+			peak = s
+		}
+	}
+
+	return int(float64(peak) / 32767.0 * 100.0)
+}
+
+// LevelToBar converts a 0-100 level to a visual bar string
+func LevelToBar(level, width int) string {
+	if level < 0 {
+		level = 0
+	}
+	if level > 100 {
+		level = 100
+	}
+
+	filled := level * width / 100
+	empty := width - filled
+
+	bar := ""
+	for i := 0; i < filled; i++ {
+		bar += "█"
+	}
+	for i := 0; i < empty; i++ {
+		bar += "░"
+	}
+
+	return bar
+}
+
+// LevelToMeter converts a 0-100 level to a visual VU meter with varying heights
+func LevelToMeter(level, width int) string {
+	if level < 0 {
+		level = 0
+	}
+	if level > 100 {
+		level = 100
+	}
+
+	// Use block characters of varying heights
+	blocks := []rune{'░', '▁', '▂', '▃', '▄', '▅', '▆', '▇', '█'}
+
+	meter := ""
+	for i := 0; i < width; i++ {
+		// Each position represents a portion of the level
+		threshold := (i + 1) * 100 / width
+		if level >= threshold {
+			meter += string(blocks[8]) // Full
+		} else if level >= threshold-10 {
+			// Partial - calculate which block to use
+			partial := (level - (threshold - 10)) * 8 / 10
+			if partial < 0 {
+				partial = 0
+			}
+			meter += string(blocks[partial])
+		} else {
+			meter += string(blocks[0]) // Empty
+		}
+	}
+
+	return meter
+}