guh

pi/roverd/audio_levels.go

@@ -1,5 +1,11 @@
 package roverd
 
+import (
+	"fmt"
+	"math"
+	"os/exec"
+)
+
 type AudioLevels struct {
 	HornGain    float64
 	TTSGain     float64
@@ -34,9 +40,7 @@ func (c *WSClient) setAudioLevels(next AudioLevels) {
 	c.audioMu.Lock()
 	c.audioLevels = normalized
 	c.audioMu.Unlock()
-	if c.horn != nil {
-		c.horn.SetGlobalGain(normalized.HornGain)
-	}
+	c.applyAudioLevelsToMixer(normalized)
 }
 
 func (c *WSClient) handleAudioLevels(payload *audioLevelsPayload) error {
@@ -56,3 +60,35 @@ func (c *WSClient) handleAudioLevels(payload *audioLevelsPayload) error {
 	c.setAudioLevels(levels)
 	return nil
 }
+
+func (c *WSClient) applyAudioLevelsToMixer(levels AudioLevels) {
+	c.applyMixerGain("HornMaster", levels.HornGain)
+	c.applyMixerGain("TTSMaster", levels.TTSGain)
+	c.applyMixerGain("ForwardMaster", levels.ForwardGain)
+}
+
+func (c *WSClient) applyMixerGain(control string, gain float64) {
+	normalized := clampAudioGain(gain)
+	if normalized <= 0 {
+		out, err := exec.Command("amixer", "-q", "-c", "0", "sset", control, "0%").CombinedOutput()
+		if err != nil {
+			c.log.Printf("audio-levels: amixer mute %s failed: %v (%s)", control, err, string(out))
+		}
+		return
+	}
+
+	// Convert linear gain to dB, matching softvol max_dB=12.0 in /etc/asound.conf.
+	db := 20.0 * math.Log10(normalized)
+	if db > 12.0 {
+		db = 12.0
+	}
+	if db < -60.0 {
+		db = -60.0
+	}
+
+	dbArg := fmt.Sprintf("%.2fdB", db)
+	out, err := exec.Command("amixer", "-q", "-c", "0", "sset", control, dbArg).CombinedOutput()
+	if err != nil {
+		c.log.Printf("audio-levels: amixer set %s=%s failed: %v (%s)", control, dbArg, err, string(out))
+	}
+}