Qt Audio

AudioAnalyzer.cpp

#include "audioanalyzer.h"

AudioAnalyzer::AudioAnalyzer(QObject *parent) : QObject(parent) {
    this->file = new QFile("c:\\Users\\User\\audioData.txt");
    if(this->file->open(QFile::WriteOnly | QFile::Truncate)) {
        this->txtStream = new QTextStream(this->file);
    }
}

void AudioAnalyzer::analyze(const QAudioBuffer &buf)
{
    qDebug() << "analyzing...";
    qDebug() << "duration: " << buf.duration() << "microsec";
    qDebug() << "sample count: " << buf.sampleCount();
    qDebug() << "start time: " << buf.startTime();
    qDebug() << "valid: " << (buf.isValid() ? "yes" : "no");

    QAudioFormat format = buf.format();
    qDebug() << "sample rate: " << format.sampleRate();
    qDebug() << "sample type: " << format.sampleType();
    qDebug() << "sample size: " << format.sampleSize();

    const qint16 *data = buf.constData<qint16>();

    for(int i = 0; i < buf.sampleCount(); i++) {
        qint16 value = (qint16)(*(data + sizeof(qint16) * i));
        qDebug() << value;
        *(this->txtStream) << value << endl;
    }

    qDebug() << endl;
    //exit(0);

}

AudioAnalyzer.h

#ifndef AUDIOANALYZER_H
#define AUDIOANALYZER_H

#include <QObject>
#include <QtMultimedia>

class AudioAnalyzer : public QObject
{
    Q_OBJECT

    QFile *file;
    QTextStream *txtStream;

public:
    explicit AudioAnalyzer(QObject *parent = 0);

signals:


public slots:

    void analyze(const QAudioBuffer &buf);

};

#endif // AUDIOANALYZER_H

codec list

foreach (const QAudioDeviceInfo &deviceInfo, QAudioDeviceInfo::availableDevices(QAudio::AudioInput)) {
    qDebug() << "Device name: " << deviceInfo.deviceName();

    qDebug() << "Codecs:" << endl;
    foreach(QString codec, deviceInfo.supportedCodecs()) {
        qDebug() << "* " << codec << endl;
    }
}

main.cpp

#include <QtCore>
#include <QtMultimedia>

#include <iostream>
using std::cout;
using std::endl;

#include "audioanalyzer.h"

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

    QAudioRecorder *recorder = new QAudioRecorder;

    QAudioEncoderSettings audioSettings;
    audioSettings.setCodec("audio/pcm");
    audioSettings.setQuality(QMultimedia::VeryHighQuality);


    recorder->setAudioSettings(audioSettings);
    recorder->setOutputLocation(QUrl::fromLocalFile("test.wav"));

    AudioAnalyzer *analyzer = new AudioAnalyzer(&a);

    QAudioProbe *audioProbe = new QAudioProbe(&a);
    if(audioProbe->setSource(recorder)) {
        QObject::connect(
            audioProbe,
            SIGNAL(audioBufferProbed(QAudioBuffer)),
            analyzer,
            SLOT(analyze(QAudioBuffer))
        );
    }

    recorder->record();

    return a.exec();
    //return 0;
}