用Qt实现录音以及放音-白红宇

用Qt实现录音以及放音

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发布时间：2019-05-24

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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:

[cpp]

#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

#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_OBJECTpublic: 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:

[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;

}

#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;}

test_play_ver0工程：

widget.h:

[cpp]

#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

#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_OBJECTpublic: 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

wideget.cpp:

[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;

}

#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;}