audioSynthDevice.h

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/* Copyright 2016 Artem Sharganov, Iakov Kirilenko
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License. */

#pragma once

#include <QtCore/QByteArray>
#include <QtCore/QIODevice>
#include <QtMultimedia/QAudioFormat>
#include <cmath>

class AudioSynthDevice : public QIODevice
{
    Q_OBJECT

public:
    AudioSynthDevice(int sampleRate, int sampleSize, QObject *parent = nullptr);

    ~AudioSynthDevice() = default;

    qint64 readData(char *data, qint64 maxlen);

    void start(int hzFreq);

    void stop();

    qint64 writeData(const char *data, qint64 len);

    qint64 bytesAvailable() const;

private:
    int generate(char *data, int lengthBytes);

private:

    QByteArray mBuffer;

    qint64 mPos;

    int mHzFreq;

    const int mSampleRate;

    const int mSampleSize;

    const bool mBuffered { false };

    long long mY1 { 0 };

    long long mY2 { 0 };

    long long mB { 0 };

    static constexpr int M = 1 << 30;

    double mOmega { std::nan("") };
};