87 lines
2.9 KiB
C++
87 lines
2.9 KiB
C++
/*
|
|
* 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;
|
|
|
|
virtual bool isMmap() = 0;
|
|
};
|
|
|
|
template <class IoDescriptor, class Filter>
|
|
sp<DeviceDescriptor> findPreferredDevice(
|
|
IoDescriptor& desc, Filter filter, bool& active, const DeviceVector& devices)
|
|
{
|
|
auto activeClients = desc->clientsList(true /*activeOnly*/);
|
|
active = activeClients.size() > 0;
|
|
|
|
if (active) {
|
|
// On MMAP IOs, the preferred device is selected by the first client (virtual client
|
|
// created when the mmap stream is opened). This client is never active.
|
|
// On non MMAP IOs, the preferred device is honored only if all active clients have
|
|
// a preferred device in which case the first client drives the selection.
|
|
if (desc->isMmap()) {
|
|
// The client list is never empty on a MMAP IO
|
|
return devices.getDeviceFromId(
|
|
desc->clientsList(false /*activeOnly*/)[0]->preferredDeviceId());
|
|
} else {
|
|
auto activeClientsWithRoute =
|
|
desc->clientsList(true /*activeOnly*/, filter, true /*preferredDevice*/);
|
|
if (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
|