1 /*
2  * Copyright (C) 2015 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 "FormattedSubsystemObject.h"
20 #include "InstanceConfigurableElement.h"
21 #include "MappingContext.h"
22 #include <Volume.h>
23 #include <AudioPolicyPluginInterface.h>
24 #include <string>
25 
26 class PolicySubsystem;
27 
28 class VolumeProfile : public CFormattedSubsystemObject
29 {
30 private:
31     struct Point
32     {
33         int index;
34         /** Volume is using FixedPointParameter until float parameters are available. */
35         int16_t dbAttenuation;
36     } __attribute__((packed));
37 
38 public:
39     VolumeProfile(const std::string &mappingValue,
40                   CInstanceConfigurableElement *instanceConfigurableElement,
41                   const CMappingContext &context);
42 
43 protected:
44     virtual bool receiveFromHW(std::string &error);
45     virtual bool sendToHW(std::string &error);
46 
47 private:
48     const PolicySubsystem *mPolicySubsystem; /**< Route subsytem plugin. */
49 
50     /**
51      * Interface to communicate with Audio Policy Engine.
52      */
53     android::AudioPolicyPluginInterface *mPolicyPluginInterface;
54 
55     /**
56      * volume profile identifier,  which is in fact a stream type to link with audio.h.
57      */
58     audio_stream_type_t mId;
59 
60     size_t mPoints;
61     Volume::device_category mCategory;
62 
63     static const uint32_t gFractional = 8; /**< Beware to align with the structure. */
64 };
65