Add test API for phone call state

ST observes and reacts to phone calls by pausing recognition.

Instrumenting a fake phone call through the telephony stack is hard,
so add a test API which mocks this callback from the telephony service
to enable CTS tests for the ST response.

Bug: 272147641
Fixes: 278904783
Test: AlwaysOnHotwordDetectorTest#
      testOnPhoneCall_recognitionPausedAndResumed
Change-Id: I409cbaca11294291d4b504e4fc2bf9971686f1ff

core/api/test-current.txt

@@ -2037,6 +2037,7 @@ package android.media.metrics {
 package android.media.soundtrigger {
 
   public final class SoundTriggerInstrumentation {
+    method public void setInPhoneCallState(boolean);
     method public void setResourceContention(boolean);
     method public void triggerOnResourcesAvailable();
     method public void triggerRestart();

core/java/com/android/internal/app/ISoundTriggerService.aidl

@@ -79,4 +79,10 @@ interface ISoundTriggerService {
      * Attach an HAL injection interface.
      */
      void attachInjection(ISoundTriggerInjection injection);
+
+    /**
+     * Test API to override the phone call state.
+     */
+     void setInPhoneCallState(boolean isInPhoneCall);
+
 }

media/java/android/media/soundtrigger/SoundTriggerInstrumentation.java

@@ -66,6 +66,8 @@ public final class SoundTriggerInstrumentation {
     @GuardedBy("mLock")
     private IBinder mClientToken = null;
 
+    private final ISoundTriggerService mService;
+
     private final GlobalCallback mClientCallback;
     private final Executor mGlobalCallbackExecutor;
 
@@ -562,6 +564,7 @@ public final class SoundTriggerInstrumentation {
             @NonNull GlobalCallback callback) {
         mClientCallback = Objects.requireNonNull(callback);
         mGlobalCallbackExecutor = Objects.requireNonNull(executor);
+        mService = service;
         try {
             service.attachInjection(new Injection());
         } catch (RemoteException e) {
@@ -651,5 +654,24 @@ public final class SoundTriggerInstrumentation {
             }
         }
     }
+
+    /**
+     * Simulate a phone call for {@link com.android.server.soundtrigger.SoundTriggerService}.
+     * If the phone call state changes, the service will be notified to respond.
+     * The service should pause recognition for the duration of the call.
+     *
+     * @param isInPhoneCall - {@code true} to cause the SoundTriggerService to
+     * see the phone call state as off-hook. {@code false} to cause the service to
+     * see the state as normal.
+     * @hide
+     */
+    @TestApi
+    public void setInPhoneCallState(boolean isInPhoneCall) {
+        try {
+            mService.setInPhoneCallState(isInPhoneCall);
+        } catch (RemoteException e) {
+            throw e.rethrowFromSystemServer();
+        }
+    }
 }
 

services/voiceinteraction/java/com/android/server/soundtrigger/SoundTriggerService.java

@@ -412,6 +412,12 @@ public class SoundTriggerService extends SystemService {
             }
         }
 
+        @Override
+        public void setInPhoneCallState(boolean isInPhoneCall) {
+            Slog.i(TAG, "Overriding phone call state: " + isInPhoneCall);
+            mDeviceStateHandler.onPhoneCallStateChanged(isInPhoneCall);
+        }
+
         @Override
         public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
             // Event loggers