async set volumn

selfdrive/ui/soundd/sound.cc

@@ -5,6 +5,7 @@
 #include <QAudio>
 #include <QAudioDeviceInfo>
 #include <QDebug>
+#include <QtConcurrent>
 
 #include "cereal/messaging/messaging.h"
 #include "common/util.h"
@@ -33,12 +34,12 @@ void Sound::update() {
   sm.update(0);
 
   // scale volume using ambient noise level
-  if (sm.updated("microphone")) {
+  if (sm.updated("microphone") && !future.isRunning()) {
     float volume = util::map_val(sm["microphone"].getMicrophone().getFilteredSoundPressureWeightedDb(), 30.f, 60.f, 0.f, 1.f);
     volume = QAudio::convertVolume(volume, QAudio::LogarithmicVolumeScale, QAudio::LinearVolumeScale);
     // set volume on changes
     if (std::exchange(current_volume, std::nearbyint(volume * 10)) != current_volume) {
-      Hardware::set_volume(volume);
+      future = QtConcurrent::run(Hardware::set_volume, volume);
     }
   }
 

selfdrive/ui/soundd/sound.h

@@ -1,3 +1,4 @@
+#include <QFuture>
 #include <QMap>
 #include <QSoundEffect>
 #include <QString>
@@ -29,6 +30,7 @@ protected:
 
   SubMaster sm;
   Alert current_alert = {};
-  QMap<AudibleAlert, QPair<QSoundEffect *, int>> sounds;
   int current_volume = -1;
+  QFuture<void> future;
+  QMap<AudibleAlert, QPair<QSoundEffect *, int>> sounds;
 };