Add callback for output stream.
The callback is targeted for events related to an output stream.
Currently, there is one callback event defined, which is codec
format changed event.
Bug: 133526565
Test: manual
Test: atest VtsHalAudioV6_0TargetTest
Change-Id: I73a4914c1ffc30e1c88b8fedd61a031e24a069f6
diff --git a/audio/6.0/Android.bp b/audio/6.0/Android.bp
index dc6bb98..16abc52 100644
--- a/audio/6.0/Android.bp
+++ b/audio/6.0/Android.bp
@@ -15,6 +15,7 @@
"IStreamIn.hal",
"IStreamOut.hal",
"IStreamOutCallback.hal",
+ "IStreamOutEventCallback.hal",
],
interfaces: [
"android.hardware.audio.common@6.0",
diff --git a/audio/6.0/IStreamOut.hal b/audio/6.0/IStreamOut.hal
index 13a86ec..9da48fe 100644
--- a/audio/6.0/IStreamOut.hal
+++ b/audio/6.0/IStreamOut.hal
@@ -19,6 +19,7 @@
import android.hardware.audio.common@6.0;
import IStream;
import IStreamOutCallback;
+import IStreamOutEventCallback;
interface IStreamOut extends IStream {
/**
@@ -168,6 +169,18 @@
clearCallback() generates (Result retval);
/**
+ * Set the callback interface for notifying about an output stream event.
+ *
+ * Calling this method with a null pointer will result in releasing
+ * the local callback proxy on the server side and thus dereference
+ * the callback implementation on the client side.
+ *
+ * @return retval operation completion status.
+ */
+ setEventCallback(IStreamOutEventCallback callback)
+ generates (Result retval);
+
+ /**
* Returns whether HAL supports pausing and resuming of streams.
*
* @return supportsPause true if pausing is supported.
diff --git a/audio/6.0/IStreamOutEventCallback.hal b/audio/6.0/IStreamOutEventCallback.hal
new file mode 100644
index 0000000..de17d73
--- /dev/null
+++ b/audio/6.0/IStreamOutEventCallback.hal
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.audio@6.0;
+
+/**
+ * Asynchronous stream out event callback interface. The interface provides
+ * a way for the HAL to notify platform when there are changes, e.g. codec
+ * format change, from the lower layer.
+ */
+interface IStreamOutEventCallback {
+ /**
+ * Codec format changed.
+ *
+ * @param audioMetadata is a buffer containing decoded format changes
+ * reported by codec. The buffer contains data that can be transformed
+ * to audio metadata, which is a C++ object based map. See
+ * `system/media/audio_utils/include/audio_utils/Metadata.h` for
+ * more details.
+ */
+ oneway onCodecFormatChanged(vec<uint8_t> audioMetadata);
+};