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third_party/sendspin-go/pkg/audio/output/volume.go

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+// ABOUTME: Volume and mute helpers shared by audio output backends
+// ABOUTME: Extracted from oto.go during the oto removal cleanup
+package output
+
+import "github.com/Sendspin/sendspin-go/pkg/audio"
+
+// applyVolume applies volume and mute to samples with clipping protection.
+// Samples are expected to be in the int32 24-bit range.
+func applyVolume(samples []int32, volume int, muted bool) []int32 {
+	multiplier := getVolumeMultiplier(volume, muted)
+
+	result := make([]int32, len(samples))
+	for i, sample := range samples {
+		scaled := int64(float64(sample) * multiplier)
+
+		if scaled > audio.Max24Bit {
+			scaled = audio.Max24Bit
+		} else if scaled < audio.Min24Bit {
+			scaled = audio.Min24Bit
+		}
+
+		result[i] = int32(scaled)
+	}
+
+	return result
+}
+
+// getVolumeMultiplier returns the float multiplier for a given volume/mute state.
+func getVolumeMultiplier(volume int, muted bool) float64 {
+	if muted {
+		return 0.0
+	}
+	return float64(volume) / 100.0
+}