Add speaker on/off control on Android for WebRTC

media/audio/audio_manager_base.cc

Index: media/audio/audio_manager_base.cc
===================================================================
--- media/audio/audio_manager_base.cc	(revision 189667)
+++ media/audio/audio_manager_base.cc	(working copy)
@@ -63,6 +63,13 @@
   CHECK(audio_thread_->Start());
 #endif
   message_loop_ = audio_thread_->message_loop_proxy();
+
+#if defined(OS_ANDROID)
+  JNIEnv* env = base::android::AttachCurrentThread();
+  jobject context = base::android::GetApplicationContext();
+  j_audio_manager_.Reset(
+      Java_AudioManagerAndroid_createAudioManagerAndroid(env, context));
+#endif
 }
 
 AudioManagerBase::~AudioManagerBase() {
@@ -125,8 +132,13 @@
       break;
   }
 
-  if (stream)
+  if (stream) {
     ++num_output_streams_;
+#if defined(OS_ANDROID)
+    if (num_output_streams_ == 1)
+      RegisterHeadsetReceiver();
+#endif
+  }
 
   return stream;
 }
@@ -166,13 +178,13 @@
       break;
   }
 
-  if (stream)
+  if (stream) {
     ++num_input_streams_;
-
 #if defined(OS_ANDROID)
-  if (num_input_streams_ == 1)
-    SetAudioMode(kAudioModeInCommunication);
+    if (num_input_streams_ == 1)
+      SetAudioMode(kAudioModeInCommunication);
 #endif
+  }
 
   return stream;
 }
@@ -256,6 +268,10 @@
   // streams.
   --num_output_streams_;
   delete stream;
+#if defined(OS_ANDROID)
+  if (!num_output_streams_)
+    UnregisterHeadsetReceiver();
+#endif
 }
 
 void AudioManagerBase::ReleaseInputStream(AudioInputStream* stream) {
@@ -371,12 +387,22 @@
 
 #if defined(OS_ANDROID)
 void AudioManagerBase::SetAudioMode(int mode) {
-  JNIEnv* env = base::android::AttachCurrentThread();
-  jobject context = base::android::GetApplicationContext();
-  DCHECK(context);
+  Java_AudioManagerAndroid_setMode(
+      base::android::AttachCurrentThread(),
+      j_audio_manager_.obj(), mode);
+}
 
-  Java_AudioManagerAndroid_setMode(env, context, mode);
+void AudioManagerBase::RegisterHeadsetReceiver() {
+  Java_AudioManagerAndroid_registerHeadsetReceiver(
+      base::android::AttachCurrentThread(),
+      j_audio_manager_.obj());
 }
-#endif
 
+void AudioManagerBase::UnregisterHeadsetReceiver() {
+  Java_AudioManagerAndroid_unregisterHeadsetReceiver(
+      base::android::AttachCurrentThread(),
+      j_audio_manager_.obj());
+}
+#endif  // defined(OS_ANDROID)
+
 }  // namespace media