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      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