Implement audio device callback

Add class AudioSystem::AudioDeviceCallback notifying
AudioSystem clients upon device selection change on a given
input or output thread.
Maintain a list of installed callback per I/O handle in AudioSystem
and call registered callbacks when an OPEN of CONFIG_CHANGED event
is received on IAudioFlingerClient::ioConfigChanged().
Add methods to AudioTrack and AudioRecord to add and remove device
change callbacks.
Add methods to AudioTrack and AudioRecord to query currently selected
device.
ioConfigChanged() events now convey the audio patch describing
the input or output thread routing.

Fix AudioRecord failure to start when invalidation is
handled by start().

Change-Id: I9e938adf025fa712337c63b1e02a8c18f2a20d39

1 files changed, 37 insertions, 6 deletions

diff --git a/include/media/AudioSystem.h b/include/media/AudioSystem.h
index 0cbcdb1..3241e9c 100644
--- a/include/media/AudioSystem.h
+++ b/include/media/AudioSystem.h
@@ -332,8 +332,26 @@ public:
 
     };
 
-    static status_t addAudioPortCallback(const sp<AudioPortCallback>& callBack);
-    static status_t removeAudioPortCallback(const sp<AudioPortCallback>& callBack);
+    static status_t addAudioPortCallback(const sp<AudioPortCallback>& callback);
+    static status_t removeAudioPortCallback(const sp<AudioPortCallback>& callback);
+
+    class AudioDeviceCallback : public RefBase
+    {
+    public:
+
+                AudioDeviceCallback() {}
+        virtual ~AudioDeviceCallback() {}
+
+        virtual void onAudioDeviceUpdate(audio_io_handle_t audioIo,
+                                         audio_port_handle_t deviceId) = 0;
+    };
+
+    static status_t addAudioDeviceCallback(const sp<AudioDeviceCallback>& callback,
+                                           audio_io_handle_t audioIo);
+    static status_t removeAudioDeviceCallback(const sp<AudioDeviceCallback>& callback,
+                                              audio_io_handle_t audioIo);
+
+    static audio_port_handle_t getDeviceIdForIo(audio_io_handle_t audioIo);
 
 private:
 
@@ -359,10 +377,20 @@ private:
         // values for output/input parameters up-to-date in client process
         virtual void ioConfigChanged(audio_io_config_event event,
                                      const sp<AudioIoDescriptor>& ioDesc);
+
+
+        status_t addAudioDeviceCallback(const sp<AudioDeviceCallback>& callback,
+                                               audio_io_handle_t audioIo);
+        status_t removeAudioDeviceCallback(const sp<AudioDeviceCallback>& callback,
+                                           audio_io_handle_t audioIo);
+
+        audio_port_handle_t getDeviceIdForIo(audio_io_handle_t audioIo);
+
     private:
         Mutex                               mLock;
-        DefaultKeyedVector<audio_io_handle_t, sp<AudioIoDescriptor> > mIoDescriptors;
-
+        DefaultKeyedVector<audio_io_handle_t, sp<AudioIoDescriptor> >   mIoDescriptors;
+        DefaultKeyedVector<audio_io_handle_t, Vector < sp<AudioDeviceCallback> > >
+                                                                        mAudioDeviceCallbacks;
         // cached values for recording getInputBufferSize() queries
         size_t                              mInBuffSize;    // zero indicates cache is invalid
         uint32_t                            mInSamplingRate;
@@ -377,8 +405,8 @@ private:
         AudioPolicyServiceClient() {
         }
 
-        status_t addAudioPortCallback(const sp<AudioPortCallback>& callBack);
-        status_t removeAudioPortCallback(const sp<AudioPortCallback>& callBack);
+        status_t addAudioPortCallback(const sp<AudioPortCallback>& callback);
+        status_t removeAudioPortCallback(const sp<AudioPortCallback>& callback);
 
         // DeathRecipient
         virtual void binderDied(const wp<IBinder>& who);
@@ -393,6 +421,9 @@ private:
         Vector <sp <AudioPortCallback> >    mAudioPortCallbacks;
     };
 
+    static const sp<AudioFlingerClient> getAudioFlingerClient();
+    static sp<AudioIoDescriptor> getIoDescriptor(audio_io_handle_t ioHandle);
+
     static sp<AudioFlingerClient> gAudioFlingerClient;
     static sp<AudioPolicyServiceClient> gAudioPolicyServiceClient;
     friend class AudioFlingerClient;