soundd: ramp immediate alert volume (#37788)

* raise volume

* stuff

* fix

* 4s

* revert

* clean up

* lean up

selfdrive/ui/soundd.py

@@ -18,6 +18,7 @@ SAMPLE_RATE = 48000
 SAMPLE_BUFFER = 4096 # (approx 100ms)
 MAX_VOLUME = 1.0
 MIN_VOLUME = 0.1
+ALERT_RAMP_TIME = 4 # seconds to ramp to max volume for warningImmediate
 SELFDRIVE_STATE_TIMEOUT = 5 # 5 seconds
 FILTER_DT = 1. / (micd.SAMPLE_RATE / micd.FFT_SAMPLES)
 
@@ -69,6 +70,9 @@ class Soundd:
     self.current_volume = MIN_VOLUME
     self.current_sound_frame = 0
 
+    self.ramp_start_volume = MIN_VOLUME
+    self.ramp_start_time = 0.
+
     self.selfdrive_timeout_alert = False
 
     self.spl_filter_weighted = FirstOrderFilter(0, 2.5, FILTER_DT, initialized=False)
@@ -117,6 +121,9 @@ class Soundd:
   def update_alert(self, new_alert):
     current_alert_played_once = self.current_alert == AudibleAlert.none or self.current_sound_frame > len(self.loaded_sounds[self.current_alert])
     if self.current_alert != new_alert and (new_alert != AudibleAlert.none or current_alert_played_once):
+      if new_alert == AudibleAlert.warningImmediate:
+        self.ramp_start_volume = self.current_volume
+        self.ramp_start_time = time.monotonic()
       self.current_alert = new_alert
       self.current_sound_frame = 0
 
@@ -162,6 +169,12 @@ class Soundd:
 
         self.get_audible_alert(sm)
 
+        # Ramp up immediate warning sound over 4s
+        if self.current_alert == AudibleAlert.warningImmediate:
+          elapsed = time.monotonic() - self.ramp_start_time
+          ramp_vol = float(np.interp(elapsed, [0, ALERT_RAMP_TIME], [self.ramp_start_volume, MAX_VOLUME]))
+          self.current_volume = max(self.current_volume, ramp_vol)
+
         rk.keep_time()
 
         assert stream.active