levelmeternode.h

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
#pragma once
 
// Std includes
#include <atomic>
 
// Audio includes
#include <audio/core/audionode.h>
#include <audio/utility/dirtyflag.h>
#include <audio/utility/safeptr.h>
#include <audio/core/process.h>
 
namespace nap
{
    namespace audio
    {
 
        // Forward declarations
        class AudioService;
 
        class NAPAPI LevelMeterNode : public Node
        {
        public:
            enum Type
            {
                PEAK, RMS
            };
 
            LevelMeterNode(NodeManager& nodeManager, TimeValue analysisWindowSize = 10, bool rootProcess = true);
 
            virtual ~LevelMeterNode();
 
            InputPin input = {this}; 
            float getLevel();
 
            void setType(Type type) { mType = type; }
 
            // Inherited from Node
            void process() override;
            void sampleRateChanged(float sampleRate) override;
 
        private:
            float calculateRms(); // Calculates output value out of one buffer of data using root mean square algorithm
            float
            calculatePeak(); // Calculates output value out of one buffer of data by determining the maximum amplitude of the buffer.
 
            SampleBuffer mBuffer; // Buffer being analyzed
            float mValue = 0; // Calculated output level value
            int mIndex = 0; // Current write index of the buffer being analyzed.
            Type mType = Type::RMS; // Algorithm currently being used to calculate the output level value from one buffer.
            DirtyFlag mDirty;
            TimeValue mAnalysisWindowSize = 0.f;
 
            bool mRootProcess = false;
        };
 
    }
}