coreaudio: handle the case when no audio device is connected

jami-client-qt#671

Change-Id: If0f2237042c746214cadb33ef8e56c22fe327a37

src/media/audio/coreaudio/osx/corelayer.mm

@@ -104,13 +104,6 @@ CoreLayer::initAudioLayerIO(AudioDeviceType stream)
     // 5) Profit...
     JAMI_DBG("INIT AUDIO IO");
 
-    // get capture divice
-    auto captureList = getDeviceList(true);
-    AudioDeviceID inputDeviceID = captureList[indexIn_].id_;
-    // get playback device
-    auto playbackList = getDeviceList(false);
-    AudioDeviceID playbackDeviceID = playbackList[indexOut_].id_;
-
     AudioUnitScope outputBus = 0;
     AudioUnitScope inputBus = 1;
     AudioComponentDescription desc = {0};
@@ -134,16 +127,26 @@ CoreLayer::initAudioLayerIO(AudioDeviceType stream)
         return;
     }
 
-    // set capture device
-    UInt32 size = sizeof(inputDeviceID);
+    AudioDeviceID inputDeviceID;
+    AudioDeviceID playbackDeviceID;
+    UInt32 size = sizeof(AudioDeviceID);
+    if (stream == AudioDeviceType::CAPTURE || stream == AudioDeviceType::ALL) {
+        auto captureList = getDeviceList(true);
+        bool useFallbackDevice = true;
+        // try to set the device selected by the user. Otherwise, the default device will be set automatically.
+        if(indexIn_ < captureList.size()) {
+            inputDeviceID = captureList[indexIn_].id_;
+
             auto error = AudioUnitSetProperty(ioUnit_,
                                               kAudioOutputUnitProperty_CurrentDevice,
                                               kAudioUnitScope_Global,
                                               inputBus,
                                               &inputDeviceID,
                                               size);
-    // if failed get default device
-    if (error != kAudioServicesNoError) {
+            useFallbackDevice = error != kAudioServicesNoError;
+        }
+        // get a fallback capture device id so we could listen when the device disconnect.
+        if (useFallbackDevice) {
             const AudioObjectPropertyAddress inputInfo = {kAudioHardwarePropertyDefaultInputDevice,
                 kAudioObjectPropertyScopeGlobal,
                 kAudioObjectPropertyElementMaster};
@@ -153,18 +156,29 @@ CoreLayer::initAudioLayerIO(AudioDeviceType stream)
                                                      NULL,
                                                      &size,
                                                      &inputDeviceID);
+            if (status != kAudioServicesNoError) {
+                JAMI_ERR() << "failed to set audio input device";
+                return;
+            }
+        }
     }
 
-    // set playback device
-    size = sizeof(playbackDeviceID);
-    error = AudioUnitSetProperty(ioUnit_,
+    if (stream == AudioDeviceType::PLAYBACK || stream == AudioDeviceType::ALL || stream == AudioDeviceType::RINGTONE) {
+        auto playbackList = getDeviceList(false);
+        auto index = stream == AudioDeviceType::RINGTONE ? indexRing_ : indexOut_;
+        bool useFallbackDevice = true;
+        if(index < playbackList.size()) {
+            playbackDeviceID = playbackList[index].id_;
+            auto error = AudioUnitSetProperty(ioUnit_,
                                               kAudioOutputUnitProperty_CurrentDevice,
                                               kAudioUnitScope_Global,
                                               outputBus,
                                               &playbackDeviceID,
                                               size);
-    // if failed get default device
-    if (error != kAudioServicesNoError) {
+            useFallbackDevice = error != kAudioServicesNoError;
+        }
+        // get fallback output device id.
+        if (useFallbackDevice) {
             const AudioObjectPropertyAddress outputInfo = {kAudioHardwarePropertyDefaultOutputDevice,
                 kAudioObjectPropertyScopeGlobal,
                 kAudioObjectPropertyElementMaster};
@@ -174,6 +188,11 @@ CoreLayer::initAudioLayerIO(AudioDeviceType stream)
                                                      NULL,
                                                      &size,
                                                      &playbackDeviceID);
+            if (status != kAudioServicesNoError) {
+                JAMI_ERR() << "failed to set audio output device";
+                return;
+            }
+        }
     }
 
     // add listener for detecting when devices are removed