ToneBuffer.h

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/****
 * Sming Framework Project - Open Source framework for high efficiency native ESP8266 development.
 * Created 2015 by Skurydin Alexey
 * http://github.com/SmingHub/Sming
 * All files of the Sming Core are provided under the LGPL v3 license.
 *
 * ToneBuffer.h - Support for simple tone generation via I2S
 *
 * @author Sept 2019 mikee47 <mike@sillyhouse.net>
 *
 ****/

#pragma once

#include <cstdint>

class ToneBufferQueue;

class ToneBuffer
{
public:
    typedef uint32_t Sample;
    static constexpr auto sampleSize = sizeof(Sample);

    ~ToneBuffer()
    {
        delete next;
        delete data;
    }

    bool allocate(unsigned sampleCount)
    {
        if(capacity < sampleCount) {
            delete data;
            data = new Sample[sampleCount];
            if(data == nullptr) {
                this->sampleCount = 0;
                return false;
            }
        }

        this->sampleCount = sampleCount;
        return true;
    }

    Sample* getData()
    {
        return data;
    }

    unsigned getCapacity()
    {
        return capacity;
    }

    unsigned getSampleCount()
    {
        return sampleCount;
    }

    unsigned repeatCount = 0;

private:
    friend ToneBufferQueue;
    ToneBuffer* next = nullptr;
    Sample* data = nullptr;
    unsigned capacity = 0;
    unsigned sampleCount = 0;
};