Send audio patch in recording callback

Remove direct access to patch handle in AudioInputDescriptor, replace with
  set / get functions.
Add interface for AudioSession to query configuration from enclosing
  input descriptor.
When input descriptor's patch handle changes during a recording, propagate
  the change through the recording notification callback.

Bug 26798796

Change-Id: Ia1395d44da7ccfe69ca46877638d1eb49b3935ad
diff --git a/media/libmedia/IAudioPolicyServiceClient.cpp b/media/libmedia/IAudioPolicyServiceClient.cpp
index 0aeaf3c..5f931e5 100644
--- a/media/libmedia/IAudioPolicyServiceClient.cpp
+++ b/media/libmedia/IAudioPolicyServiceClient.cpp
@@ -82,7 +82,7 @@
 
     void onRecordingConfigurationUpdate(int event, audio_session_t session,
             audio_source_t source, const audio_config_base_t *clientConfig,
-            const audio_config_base_t *deviceConfig) {
+            const audio_config_base_t *deviceConfig, audio_patch_handle_t patchHandle) {
         Parcel data, reply;
         data.writeInterfaceToken(IAudioPolicyServiceClient::getInterfaceDescriptor());
         data.writeInt32(event);
@@ -90,6 +90,7 @@
         data.writeInt32(source);
         writeAudioConfigBaseToParcel(data, clientConfig);
         writeAudioConfigBaseToParcel(data, deviceConfig);
+        data.writeInt32(patchHandle);
         remote()->transact(RECORDING_CONFIGURATION_UPDATE, data, &reply, IBinder::FLAG_ONEWAY);
     }
 };
@@ -128,7 +129,9 @@
             audio_config_base_t deviceConfig;
             readAudioConfigBaseFromParcel(data, &clientConfig);
             readAudioConfigBaseFromParcel(data, &deviceConfig);
-            onRecordingConfigurationUpdate(event, session, source, &clientConfig, &deviceConfig);
+            audio_patch_handle_t patchHandle = (audio_patch_handle_t) data.readInt32();
+            onRecordingConfigurationUpdate(event, session, source, &clientConfig, &deviceConfig,
+                    patchHandle);
             return NO_ERROR;
         } break;
     default: