Enhance call sounds: Reduce backgroundnoise on ringing sounds, reduce filesize, reintroduce 'connecting' sound, add 'call ended' sound

src/org/thoughtcrime/securesms/service/WebRtcCallService.java

@@ -432,7 +432,7 @@ private void handleOutgoingCall(Intent intent) {
     sendMessage(WebRtcViewModel.State.CALL_OUTGOING, recipient, localCameraState, remoteVideoEnabled, bluetoothAvailable, microphoneEnabled);
     lockManager.updatePhoneState(LockManager.PhoneState.IN_CALL);
     audioManager.initializeAudioForCall();
-    audioManager.startOutgoingRinger(OutgoingRinger.Type.RINGING);
+    audioManager.startOutgoingRinger(OutgoingRinger.Type.CONNECTING);
     bluetoothStateManager.setWantsConnection(true);
 
     setCallInProgressNotification(TYPE_OUTGOING_RINGING, recipient);
@@ -594,6 +594,7 @@ private void handleIceConnected(Intent intent) {
       if (this.recipient == null) throw new AssertionError("assert");
 
       this.callState = CallState.STATE_REMOTE_RINGING;
+      this.audioManager.startOutgoingRinger(OutgoingRinger.Type.RINGING);
 
       sendMessage(WebRtcViewModel.State.CALL_RINGING, recipient, localCameraState, remoteVideoEnabled, bluetoothAvailable, microphoneEnabled);
     }

src/org/thoughtcrime/securesms/webrtc/audio/OutgoingRinger.java

@@ -16,6 +16,7 @@ public class OutgoingRinger {
   private static final String TAG = OutgoingRinger.class.getSimpleName();
 
   public enum Type {
+    CONNECTING,
     RINGING,
     BUSY
   }
@@ -27,12 +28,13 @@ public enum Type {
   public OutgoingRinger(@NonNull Context context) {
     this.context        = context;
   }
-  
+
   public void start(Type type) {
     int soundId;
 
-    if      (type == Type.RINGING) soundId = R.raw.redphone_outring;
-    else if (type == Type.BUSY)    soundId = R.raw.redphone_busy;
+    if      (type == Type.CONNECTING)   soundId = R.raw.signal_connecting;
+    else if (type == Type.RINGING) soundId = R.raw.signal_outring;
+    else if (type == Type.BUSY)    soundId = R.raw.signal_busy;
     else throw new IllegalArgumentException("Not a valid sound type");
 
     if( mediaPlayer != null ) {

src/org/thoughtcrime/securesms/webrtc/audio/SignalAudioManager.java

@@ -55,6 +55,10 @@ public void startOutgoingRinger(OutgoingRinger.Type type) {
     AudioManager audioManager = ServiceUtil.getAudioManager(context);
     audioManager.setMicrophoneMute(false);
 
+    if (type == OutgoingRinger.Type.CONNECTING) {
+      audioManager.setSpeakerphoneOn(false);
+    }
+
     audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
 
     outgoingRinger.start(type);