1 /*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #pragma once
18
19 #include "DeviceDescriptor.h"
20
21 namespace android {
22
23 /**
24 * Interface for I/O descriptors to implement so information about their context
25 * can be queried and updated.
26 */
27 class AudioIODescriptorInterface
28 {
29 public:
~AudioIODescriptorInterface()30 virtual ~AudioIODescriptorInterface() {};
31
32 virtual audio_config_base_t getConfig() const = 0;
33
34 virtual audio_patch_handle_t getPatchHandle() const = 0;
35
36 virtual void setPatchHandle(audio_patch_handle_t handle) = 0;
37 };
38
39 template <class IoDescriptor, class Filter>
findPreferredDevice(IoDescriptor & desc,Filter filter,bool & active,const DeviceVector & devices)40 sp<DeviceDescriptor> findPreferredDevice(
41 IoDescriptor& desc, Filter filter, bool& active, const DeviceVector& devices)
42 {
43 auto activeClients = desc->clientsList(true /*activeOnly*/);
44 auto activeClientsWithRoute =
45 desc->clientsList(true /*activeOnly*/, filter, true /*preferredDevice*/);
46 active = activeClients.size() > 0;
47 if (active && activeClients.size() == activeClientsWithRoute.size()) {
48 return devices.getDeviceFromId(activeClientsWithRoute[0]->preferredDeviceId());
49 }
50 return nullptr;
51 }
52
53 template <class IoCollection, class Filter>
findPreferredDevice(IoCollection & ioCollection,Filter filter,const DeviceVector & devices)54 sp<DeviceDescriptor> findPreferredDevice(
55 IoCollection& ioCollection, Filter filter, const DeviceVector& devices)
56 {
57 sp<DeviceDescriptor> device;
58 for (size_t i = 0; i < ioCollection.size(); i++) {
59 auto desc = ioCollection.valueAt(i);
60 bool active;
61 sp<DeviceDescriptor> curDevice = findPreferredDevice(desc, filter, active, devices);
62 if (active && curDevice == nullptr) {
63 return nullptr;
64 } else if (curDevice != nullptr) {
65 device = curDevice;
66 }
67 }
68 return device;
69 }
70
71 } // namespace android
72