| /* |
| * Copyright (C) 2016 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. |
| */ |
| |
| #pragma once |
| |
| #include "DeviceDescriptor.h" |
| |
| namespace android { |
| |
| /** |
| * Interface for I/O descriptors to implement so information about their context |
| * can be queried and updated. |
| */ |
| class AudioIODescriptorInterface |
| { |
| public: |
| virtual ~AudioIODescriptorInterface() {}; |
| |
| virtual audio_config_base_t getConfig() const = 0; |
| |
| virtual audio_patch_handle_t getPatchHandle() const = 0; |
| |
| virtual void setPatchHandle(audio_patch_handle_t handle) = 0; |
| }; |
| |
| template <class IoDescriptor, class Filter> |
| sp<DeviceDescriptor> findPreferredDevice( |
| IoDescriptor& desc, Filter filter, bool& active, const DeviceVector& devices) |
| { |
| auto activeClients = desc->clientsList(true /*activeOnly*/); |
| auto activeClientsWithRoute = |
| desc->clientsList(true /*activeOnly*/, filter, true /*preferredDevice*/); |
| active = activeClients.size() > 0; |
| if (active && activeClients.size() == activeClientsWithRoute.size()) { |
| return devices.getDeviceFromId(activeClientsWithRoute[0]->preferredDeviceId()); |
| } |
| return nullptr; |
| } |
| |
| template <class IoCollection, class Filter> |
| sp<DeviceDescriptor> findPreferredDevice( |
| IoCollection& ioCollection, Filter filter, const DeviceVector& devices) |
| { |
| sp<DeviceDescriptor> device; |
| for (size_t i = 0; i < ioCollection.size(); i++) { |
| auto desc = ioCollection.valueAt(i); |
| bool active; |
| sp<DeviceDescriptor> curDevice = findPreferredDevice(desc, filter, active, devices); |
| if (active && curDevice == nullptr) { |
| return nullptr; |
| } else if (curDevice != nullptr) { |
| device = curDevice; |
| } |
| } |
| return device; |
| } |
| |
| } // namespace android |