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用Qt实现录音以及放音

2011-03-06 01:18 302 查看
本文博客链接:http://blog.csdn.net/jdh99,作者:jdh,转载请注明.



环境：Ubuntu10.04,Qt Creator 2.0.1,Qt 4.7.0



参考Qt帮助文档，对QAudioInput类以及QAudioOutput类进行操作，实现录音以及放音.



工作流程：test_record_ver0工程录音3S，将声音文件保存在/root/qt_code/test.raw中,test_play_ver0工程打开test.raw文件，并输出声音.



源代码：

test_record_ver0工程：

widget.h:

#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QtGui>
#include <QAudioInput>
#include <iostream>
using namespace std;
namespace Ui {
    class Widget;
}
class Widget : public QWidget
{
    Q_OBJECT
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
private slots:
    void stopRecording();
private:
    Ui::Widget *ui;
    QFile outputFile;   // class member.
    QAudioInput* audio; // class member.
};
#endif // WIDGET_H




widget.cpp:

#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    outputFile.setFileName("/root/qt_code/test.raw");
    outputFile.open( QIODevice::WriteOnly | QIODevice::Truncate );
    QAudioFormat format;
    // set up the format you want, eg.
    format.setFrequency(8000);
    format.setChannels(1);
    format.setSampleSize(8);
    format.setCodec("audio/pcm");
    format.setByteOrder(QAudioFormat::LittleEndian);
    format.setSampleType(QAudioFormat::UnSignedInt);
    QAudioDeviceInfo info = QAudioDeviceInfo::defaultInputDevice();
    if (!info.isFormatSupported(format)) {
       qWarning()<<"default format not supported try to use nearest";
       format = info.nearestFormat(format);
    }
    audio = new QAudioInput(format, this);
    QTimer::singleShot(3000, this, SLOT(stopRecording()));
    audio->start(&outputFile);
    // Records audio for 3000ms
     cout <<"record begin!" << endl;
}
void Widget::stopRecording()
 {
   audio->stop();
   outputFile.close();
   delete audio;
   cout <<"record end!" << endl;
 }
Widget::~Widget()
{
    delete ui;
}






[b]test_play_ver0工程：[/b]

[b]widget.h:[/b]

[b]
#ifndef WIDGET_H
#define WIDGET_H
#include <QWidget>
#include <QtGui>
#include <QAudioInput>
#include <QAudioOutput>
#include <iostream>
using namespace std;
namespace Ui {
    class Widget;
}
class Widget : public QWidget
{
    Q_OBJECT
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
private slots:
    void finishedPlaying(QAudio::State state);
private:
    Ui::Widget *ui;
    QFile inputFile;   // class member.
    QAudioOutput* audio; // class member.
};
#endif // WIDGET_H
[/b]



wideget.cpp:

#include "widget.h"
#include "ui_widget.h"
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    inputFile.setFileName("/root/qt_code/test.raw");
    //inputFile.setFileName("/root/share/wav.wav");
    inputFile.open(QIODevice::ReadOnly);
    QAudioFormat format;
    // Set up the format, eg.
    format.setFrequency(8000);
    format.setChannels(1);
    format.setSampleSize(8);
    format.setCodec("audio/pcm");
    format.setByteOrder(QAudioFormat::LittleEndian);
    format.setSampleType(QAudioFormat::UnSignedInt);
    QAudioDeviceInfo info(QAudioDeviceInfo::defaultOutputDevice());
    if (!info.isFormatSupported(format)) {
     qWarning()<<"raw audio format not supported by backend, cannot play audio.";
     return;
    }
    audio = new QAudioOutput(format, this);
    connect(audio,SIGNAL(stateChanged(QAudio::State)),SLOT(finishedPlaying(QAudio::State)));
    audio->start(&inputFile);
    cout <<"play begin!" << endl;
}
void Widget::finishedPlaying(QAudio::State state)
 {
   if(state == QAudio::IdleState) {
     audio->stop();
     inputFile.close();
     delete audio;
   }
   cout << "play end!" << endl;
 }
Widget::~Widget()
{
    delete ui;
}






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