如何在Qt中简单地获取音频振幅

#include <QAudioInput>
#include <QIODevice>
#include <QDebug>

class AudioInputDevice : public QIODevice
{
    Q_OBJECT
public:
    explicit AudioInputDevice(QObject *parent = nullptr);
    qint64 readData(char *data, qint64 maxlen) override;
    qint64 writeData(const char *data, qint64 len) override;
};

AudioInputDevice::AudioInputDevice(QObject *parent)
    : QIODevice(parent)
{
    QAudioFormat format;
    format.setSampleRate(44100);  // 设置采样率
    format.setChannelCount(1);    // 设置声道数
    format.setSampleSize(16);     // 设置样本大小
    format.setCodec("audio/pcm"); // 设置音频编码格式
    format.setByteOrder(QAudioFormat::LittleEndian);
    format.setSampleType(QAudioFormat::SignedInt);

    QAudioDeviceInfo info = QAudioDeviceInfo::defaultInputDevice();
    if (!info.isFormatSupported(format)) {
        qWarning() << "Default format not supported, trying to use the nearest.";
        format = info.nearestFormat(format);
    }

    QAudioInput *audioInput = new QAudioInput(format, this);
    audioInput->start(this);
}

qint64 AudioInputDevice::readData(char *data, qint64 maxlen)
{
    Q_UNUSED(data);
    Q_UNUSED(maxlen);
    return 0;
}

qint64 AudioInputDevice::writeData(const char *data, qint64 len)
{
    // 在这里可以对音频数据进行处理，例如计算振幅
    // data参数是音频数据的指针，len参数是数据的长度

    // 示例：计算音频振幅
    qint16 *audioData = reinterpret_cast<qint16*>(const_cast<char*>(data));
    qint64 sampleCount = len / sizeof(qint16);
    qint64 sum = 0;
    for (qint64 i = 0; i < sampleCount; ++i) {
        sum += qAbs(audioData[i]);
    }
    qint64 amplitude = sum / sampleCount;

    qDebug() << "音频振幅：" << amplitude;

    return len;
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    AudioInputDevice audioInputDevice;

    return a.exec();
}