feat: expose audio attributes (#310)

Author: santhoshvai

stream-webrtc-android/src/main/java/org/webrtc/audio/JavaAudioDeviceModule.java

@@ -373,8 +373,8 @@ public static boolean isBuiltInNoiseSuppressorSupported() {
 
   private final Context context;
   private final AudioManager audioManager;
-  private final WebRtcAudioRecord audioInput;
-  private final WebRtcAudioTrack audioOutput;
+  public final WebRtcAudioRecord audioInput;
+  public final WebRtcAudioTrack audioOutput;
   private final int inputSampleRate;
   private final int outputSampleRate;
   private final boolean useStereoInput;

stream-webrtc-android/src/main/java/org/webrtc/audio/WebRtcAudioTrack.java

@@ -62,7 +62,7 @@ class WebRtcAudioTrack {
 
   private ByteBuffer byteBuffer;
 
-  private @Nullable final AudioAttributes audioAttributes;
+  public @Nullable AudioAttributes audioAttributes;
   private @Nullable AudioTrack audioTrack;
   private @Nullable AudioTrackThread audioThread;
   private final VolumeLogger volumeLogger;