Bluetooth: A2DP offload HIDL (9526c2ff) · Commits · e / os / android_hardware_interfaces

bluetooth/a2dp/1.0/Android.bp

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		// This file is autogenerated by hidl-gen -Landroidbp.

		hidl_interface {
		name: "android.hardware.bluetooth.a2dp@1.0",
		root: "android.hardware",
		vndk: {
		enabled: true,
		},
		srcs: [
		"types.hal",
		"IBluetoothAudioHost.hal",
		"IBluetoothAudioOffload.hal",
		],
		interfaces: [
		"android.hidl.base@1.0",
		],
		types: [
		"BitsPerSample",
		"ChannelMode",
		"CodecConfiguration",
		"CodecType",
		"SampleRate",
		"Status",
		],
		gen_java: false,
		}

bluetooth/a2dp/1.0/IBluetoothAudioHost.hal

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		/*
		* Copyright (C) 2018 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.bluetooth.a2dp@1.0;

		/**
		* HAL interface for Bluetooth A2DP Offload functionality where
		* the encoding of the A2DP data packets is offloaded to platform
		* specific encoders. The A2DP control path is maintained in the
		* Bluetooth stack.
		*
		* This interface is from HAL server to HAL client.
		*
		* The HAL server must call into the IBluetoothAudioHost to initiate
		* the start, suspend and stop of the streaming operation. These
		* calls return immediately and the results, if any, are send over
		* the IBluetoothAudioOffload interface.
		*/

		interface IBluetoothAudioHost {
		/**
		* Invoked when the start stream is requested from HAL server
		* to HAL client. This indicates that the HAL server
		* has initialized the platform for streaming use case, and the
		* HAL client can proceed with the streaming procedure. The
		* result of the operation must be provided by the HAL
		* client using the IBluetoothAudioOffload interface.
		*/
		oneway startStream();

		/**
		* Invoked when the suspend stream is requested from HAL server
		* to HAL client. This indicates that the HAL server
		* wants to suspend the streaming procedure. The result of the
		* operation must be provided by the HAL client using the
		* IBluetoothAudioOffload interface.
		*/
		oneway suspendStream();

		/**
		* Invoked when the stop stream is requested from HAL server
		* to HAL client. This indicates that the HAL server wants to
		* stop and reset the streaming procedure. There is no result
		* provided by the HAL client for this call.
		*/
		oneway stopStream();

		};

bluetooth/a2dp/1.0/IBluetoothAudioOffload.hal

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		/*
		* Copyright (C) 2018 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.bluetooth.a2dp@1.0;

		import IBluetoothAudioHost;

		/**
		* HAL interface for Bluetooth A2DP Offload functionality where
		* the encoding of the A2DP data packets is offloaded to platform
		* specific encoders. The A2DP control path is maintained in the
		* Bluetooth stack.
		*
		* This interface is from HAL client to HAL server.
		*
		* The HAL client must provide the handle of IBluetoothAudioHost as well
		* as codec configuration to the HAL server, when its connected to an
		* active A2DP Sink device. HAL Server, based on the feedback from the Audio
		* framework must call into the commands provided by the IBluetoothAudioHost.
		* HAL client must call into IBluetoothAudioOffload to provide the status of
		* these commands. Once the device becomes inactive, the HAL client must
		* call the endSession to terminate the session with the HAL server.
		*/
		interface IBluetoothAudioOffload {

		/**
		* Indicates that the HAL client is connected to an A2DP Sink device
		* and is ready to stream audio. This function is also used to register
		* the BluetoothAudioHost interface and the provide the current negotiated
		* codec.
		*
		* \|endSession\| must be called to unregister the interface.
		*
		* @param hostIf interface used to request stream control
		* @param codecConfig Codec configuration as negotiated with the A2DP Sink
		* device
		* @return status one of the following
		* SUCCESS if HAL server successfully initializes the platform with the
		* given codec configuration
		* UNSUPPORTED_CODEC_CONFIGURATION if HAL server cannot initialize the
		* platform with the given codec configuration
		* FAILURE if HAL server cannot initialize the platform for any other
		* reason
		*/
		startSession(IBluetoothAudioHost hostIf, CodecConfiguration codecConfig) generates (Status status);

		/**
		* Updates status for start stream request. The HAL client may need
		* to communicate to Bluetooth Controller and remote Sink device, in which
		* case it must update with PENDING status. Once the operation is
		* completed, it must return with either SUCCESS or FAILURE.
		*
		* @param status SUCCESS, FAILURE or PENDING
		*/
		oneway streamStarted(Status status);

		/**
		* Updates status for suspend stream request. The HAL client may need
		* to communicate to Bluetooth Controller and remote device, in which case
		* it must update with PENDING status. Once the operation is completed, it
		* must return with either SUCCESS or FAILURE.
		*
		* @param status SUCCESS, FAILURE or PENDING
		*/
		oneway streamSuspended(Status status);

		/**
		* Ends the current A2DP offload session and unregisters the
		* BluetoothAudioHost interface.
		*/
		oneway endSession();
		};

bluetooth/a2dp/1.0/default/Android.bp

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		cc_library_shared {
		name: "android.hardware.bluetooth.a2dp@1.0-impl",
		relative_install_path: "hw",
		vendor: true,
		srcs: [
		"BluetoothAudioOffload.cpp",
		],
		shared_libs: [
		"libhidlbase",
		"libhidltransport",
		"libutils",
		"android.hardware.bluetooth.a2dp@1.0",
		],
		}

bluetooth/a2dp/1.0/default/BluetoothAudioOffload.cpp

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		/*
		* Copyright (C) 2018 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.
		*/

		#include "BluetoothAudioOffload.h"

		namespace android {
		namespace hardware {
		namespace bluetooth {
		namespace a2dp {
		namespace V1_0 {
		namespace implementation {

		IBluetoothAudioOffload* HIDL_FETCH_IBluetoothAudioOffload(const char* /* name */) {
		return new BluetoothAudioOffload();
		}

		// Methods from ::android::hardware::bluetooth::a2dp::V1_0::IBluetoothAudioOffload follow.
		Return<::android::hardware::bluetooth::a2dp::V1_0::Status> BluetoothAudioOffload::startSession(
		const sp<::android::hardware::bluetooth::a2dp::V1_0::IBluetoothAudioHost>& hostIf __unused,
		const ::android::hardware::bluetooth::a2dp::V1_0::CodecConfiguration& codecConfig __unused) {
		/**
		* Initialize the audio platform if codecConfiguration is supported.
		* Save the the IBluetoothAudioHost interface, so that it can be used
		* later to send stream control commands to the HAL client, based on
		* interaction with Audio framework.
		*/
		return ::android::hardware::bluetooth::a2dp::V1_0::Status::FAILURE;
		}

		Return<void> BluetoothAudioOffload::streamStarted(
		::android::hardware::bluetooth::a2dp::V1_0::Status status __unused) {
		/**
		* Streaming on control path has started,
		* HAL server should start the streaming on data path.
		*/
		return Void();
		}

		Return<void> BluetoothAudioOffload::streamSuspended(
		::android::hardware::bluetooth::a2dp::V1_0::Status status __unused) {
		/**
		* Streaming on control path has suspend,
		* HAL server should suspend the streaming on data path.
		*/
		return Void();
		}

		Return<void> BluetoothAudioOffload::endSession() {
		/**
		* Cleanup the audio platform as remote A2DP Sink device is no
		* longer active
		*/
		return Void();
		}

		} // namespace implementation
		} // namespace V1_0
		} // namespace a2dp
		} // namespace bluetooth
		} // namespace hardware
		} // namespace android