Refactor android specific code in AudioManagerBase class.

media/audio/android/audio_manager_android.cc

Index: media/audio/android/audio_manager_android.cc
===================================================================
--- media/audio/android/audio_manager_android.cc	(revision 194203)
+++ media/audio/android/audio_manager_android.cc	(working copy)
@@ -5,6 +5,7 @@
 #include "media/audio/android/audio_manager_android.h"
 
 #include "base/logging.h"
+#include "jni/AudioManagerAndroid_jni.h"
 #include "media/audio/android/opensles_input.h"
 #include "media/audio/android/opensles_output.h"
 #include "media/audio/audio_manager.h"
@@ -18,12 +19,20 @@
 // Maximum number of output streams that can be open simultaneously.
 static const int kMaxOutputStreams = 10;
 
+static const int kAudioModeNormal = 0x00000000;
+static const int kAudioModeInCommunication = 0x00000003;
+
 AudioManager* CreateAudioManager() {
   return new AudioManagerAndroid();
 }
 
 AudioManagerAndroid::AudioManagerAndroid() {
   SetMaxOutputStreamsAllowed(kMaxOutputStreams);
+
+  j_audio_manager_.Reset(
+      Java_AudioManagerAndroid_createAudioManagerAndroid(
+          base::android::AttachCurrentThread(),
+          base::android::GetApplicationContext()));
 }
 
 AudioManagerAndroid::~AudioManagerAndroid() {
@@ -57,6 +66,36 @@
       kDefaultSampleRate, 16, kDefaultBufferSize);
 }
 
+AudioOutputStream* AudioManagerAndroid::MakeAudioOutputStream(
+    const AudioParameters& params) {
+  AudioOutputStream* stream =
+    AudioManagerBase::MakeAudioOutputStream(params);
+  if (GetNumOutputStreams() == 1)
+    RegisterHeadsetReceiver();
+  return stream;
+}
+
+AudioInputStream* AudioManagerAndroid::MakeAudioInputStream(
+    const AudioParameters& params, const std::string& device_id) {
+  AudioInputStream* stream =
+    AudioManagerBase::MakeAudioInputStream(params, device_id);
+  if (GetNumInputStreams() == 1)
+    SetAudioMode(kAudioModeInCommunication);
+  return stream;
+}
+
+void AudioManagerAndroid::ReleaseOutputStream(AudioOutputStream* stream) {
+  AudioManagerBase::ReleaseOutputStream(stream);
+  if (!GetNumOutputStreams())
+    UnregisterHeadsetReceiver();
+}
+
+void AudioManagerAndroid::ReleaseInputStream(AudioInputStream* stream) {
+  AudioManagerBase::ReleaseInputStream(stream);
+  if (!GetNumInputStreams())
+    SetAudioMode(kAudioModeNormal);
+}
+
 AudioOutputStream* AudioManagerAndroid::MakeLinearOutputStream(
       const AudioParameters& params) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
@@ -116,4 +155,27 @@
       sample_rate, bits_per_sample, buffer_size);
 }
 
+// static
+bool AudioManagerAndroid::RegisterAudioManager(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+void AudioManagerAndroid::SetAudioMode(int mode) {
+  Java_AudioManagerAndroid_setMode(
+      base::android::AttachCurrentThread(),
+      j_audio_manager_.obj(), mode);
+}
+
+void AudioManagerAndroid::RegisterHeadsetReceiver() {
+  Java_AudioManagerAndroid_registerHeadsetReceiver(
+      base::android::AttachCurrentThread(),
+      j_audio_manager_.obj());
+}
+
+void AudioManagerAndroid::UnregisterHeadsetReceiver() {
+  Java_AudioManagerAndroid_unregisterHeadsetReceiver(
+      base::android::AttachCurrentThread(),
+      j_audio_manager_.obj());
+}
+
 }  // namespace media