87 lines
2.9 KiB
C
87 lines
2.9 KiB
C
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "DeviceDescriptor.h"
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namespace android {
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/**
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* Interface for I/O descriptors to implement so information about their context
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* can be queried and updated.
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*/
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class AudioIODescriptorInterface
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{
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public:
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virtual ~AudioIODescriptorInterface() {};
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virtual audio_config_base_t getConfig() const = 0;
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virtual audio_patch_handle_t getPatchHandle() const = 0;
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virtual void setPatchHandle(audio_patch_handle_t handle) = 0;
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virtual bool isMmap() = 0;
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};
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template <class IoDescriptor, class Filter>
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sp<DeviceDescriptor> findPreferredDevice(
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IoDescriptor& desc, Filter filter, bool& active, const DeviceVector& devices)
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{
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auto activeClients = desc->clientsList(true /*activeOnly*/);
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active = activeClients.size() > 0;
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if (active) {
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// On MMAP IOs, the preferred device is selected by the first client (virtual client
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// created when the mmap stream is opened). This client is never active.
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// On non MMAP IOs, the preferred device is honored only if all active clients have
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// a preferred device in which case the first client drives the selection.
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if (desc->isMmap()) {
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// The client list is never empty on a MMAP IO
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return devices.getDeviceFromId(
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desc->clientsList(false /*activeOnly*/)[0]->preferredDeviceId());
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} else {
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auto activeClientsWithRoute =
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desc->clientsList(true /*activeOnly*/, filter, true /*preferredDevice*/);
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if (activeClients.size() == activeClientsWithRoute.size()) {
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return devices.getDeviceFromId(activeClientsWithRoute[0]->preferredDeviceId());
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}
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}
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}
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return nullptr;
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}
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template <class IoCollection, class Filter>
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sp<DeviceDescriptor> findPreferredDevice(
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IoCollection& ioCollection, Filter filter, const DeviceVector& devices)
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{
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sp<DeviceDescriptor> device;
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for (size_t i = 0; i < ioCollection.size(); i++) {
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auto desc = ioCollection.valueAt(i);
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bool active;
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sp<DeviceDescriptor> curDevice = findPreferredDevice(desc, filter, active, devices);
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if (active && curDevice == nullptr) {
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return nullptr;
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} else if (curDevice != nullptr) {
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device = curDevice;
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}
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}
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return device;
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}
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} // namespace android
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