70 lines
2.7 KiB
C++
70 lines
2.7 KiB
C++
/*
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* Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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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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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0/
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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#ifndef ALEXA_CLIENT_SDK_EQUALIZERIMPLEMENTATIONS_INCLUDE_EQUALIZERIMPLEMENTATIONS_EQUALIZERLINEARBANDMAPPER_H_
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#define ALEXA_CLIENT_SDK_EQUALIZERIMPLEMENTATIONS_INCLUDE_EQUALIZERIMPLEMENTATIONS_EQUALIZERLINEARBANDMAPPER_H_
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#include <functional>
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#include <memory>
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#include <AVSCommon/SDKInterfaces/Audio/EqualizerTypes.h>
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#include "EqualizerBandMapperInterface.h"
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namespace alexaClientSDK {
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namespace equalizer {
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/**
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* Provides linear mapping from AVS provided bands to target number of bands. Target bands are assumed to be equally
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* distributed among whole spectrum of equalization frequencies starting from basses to treble. I.e. if there are 10
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* target bands, band with index 0 would be the lowest frequency while band with index 9 will be the highest frequency.
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* AVS bands are also assumed to be distributed equally among the whole spectrum. I.e. if TREBLE is the only one band
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* provided, it will cover top third of target frequencies. All other bands will be assumed to have have equalization
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* level equal to 0 dB, meaning no equalization. This value will be distributed among target bands for lower two thirds.
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*/
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class EqualizerLinearBandMapper : public EqualizerBandMapperInterface {
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public:
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/**
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* Factory method that creates a linear band mapper given the number of target bands.
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*
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* @param numberOfTargetBands
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* @return
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*/
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static std::shared_ptr<EqualizerLinearBandMapper> create(int numberOfTargetBands);
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/// @name EqualizerBandMapperInterface methods
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/// @{
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void mapEqualizerBands(
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const avsCommon::sdkInterfaces::audio::EqualizerBandLevelMap& bandLevelMap,
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std::function<void(int, int)> setBandCallback) override;
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///}@
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private:
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/**
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* Constructor that creates a linear band mapper given the number of target bands.
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*
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* @param numberOfTargetBands
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*/
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explicit EqualizerLinearBandMapper(int numberOfTargetBands);
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/// Number of bands to map to.
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int m_numberOfTargetBands;
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};
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} // namespace equalizer
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} // namespace alexaClientSDK
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#endif // ALEXA_CLIENT_SDK_EQUALIZERIMPLEMENTATIONS_INCLUDE_EQUALIZERIMPLEMENTATIONS_EQUALIZERLINEARBANDMAPPER_H_
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