choose first device if audio output is null (#651)

Co-authored-by: Maciej Brażewicz <[email protected]>

Author: d3xvn

packages/stream_video/lib/src/call/state/mixins/state_lifecycle_mixin.dart

@@ -109,7 +109,7 @@ mixin StateLifecycleMixin on StateNotifier<CallState> {
     List<RtcMediaDevice>? audioOutputs,
     List<RtcMediaDevice>? audioInputs,
   }) {
-    final defaultAudioOutput = audioOutputs?.firstWhereOrNull((device) {
+    var defaultAudioOutput = audioOutputs?.firstWhereOrNull((device) {
       if (stage.data.metadata.settings.audio.defaultDevice ==
           AudioSettingsRequestDefaultDeviceEnum.speaker) {
         return device.id.equalsIgnoreCase(
@@ -122,6 +122,12 @@ mixin StateLifecycleMixin on StateNotifier<CallState> {
       );
     });
 
+    if (defaultAudioOutput == null &&
+        audioOutputs != null &&
+        audioOutputs.isNotEmpty) {
+      defaultAudioOutput = audioOutputs.first;
+    }
+
     final defaultAudioInput = audioInputs
             ?.firstWhereOrNull((d) => d.label == defaultAudioOutput?.label) ??
         audioInputs?.firstOrNull;