最近做项目, 需要一个麦克风音量监听的功能:

找了好多这方面的资料, 不知道为什么 总之很少, 

在此总结一下, 发贴一枚..

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不啰嗦了, 直接上代码了: 

#ifndef AUDIORECORDER_H
#define AUDIORECORDER_H

#include <QFile>
#include <QWidget>
#include <QPushButton>
#include <QAudioInput>
#include <QAudioOutput>
#include <QAudioDeviceInfo>

#include "ui_AudioRecorder.h"

class AudioRecorder : public QWidget
{
	Q_OBJECT

public:
	AudioRecorder(QWidget *parent = 0);
	~AudioRecorder();

private:
	int AddWavHeader(char *);
	int ApplyVolumeToSample(short iSample);
	void InitMonitor();
	void CreateAudioInput();
	void CreateAudioOutput();

private slots:
	void OnRecordStart();
	void OnRecordStop();
	void OnRecordPlay();
	void OnRecordSave();

	void OnStateChange(QAudio::State s);
	void OnReadMore();
	void OnSliderValueChanged(int);
	void OnTimeOut();

private:
	Ui::Recorder ui;
	int miVolume;
	int miMaxValue;

private:
	QAudioFormat mFormatFile;
	QFile *mpOutputFile;

	QAudioInput *mpAudioInputFile;		// 负责读写文件
	QAudioOutput *mpAudioOutputFile;

	QAudioFormat mFormatSound;
	QAudioInput *mpAudioInputSound;		// 负责监听声音
	QAudioOutput *mpAudioOutputSound;

	QIODevice *mpInputDevSound;
	QIODevice *mpOutputDevSound;
};

#endif // AUDIORECORDER_H

#include "AudioRecorder.h"
#include <QLayout>
#include <QDebug>
#include <QTimer>
#include <QFileDialog>
#include <QMessageBox>

#define BufferSize 14096

struct HEADER
{
	char RIFFNAME[4];
	unsigned long nRIFFLength;
	char WAVNAME[4];
	char FMTNAME[4];
	unsigned long nFMTLength;
	unsigned short nAudioFormat;
	unsigned short nChannleNumber;
	unsigned long nSampleRate;
	unsigned long nBytesPerSecond;
	unsigned short nBytesPerSample;
	unsigned short    nBitsPerSample;
	char    DATANAME[4];
	unsigned long   nDataLength;
};

AudioRecorder::AudioRecorder(QWidget *parent)
	: QWidget(parent)
{
	ui.setupUi(this);
	
	miMaxValue = http://www.mamicode.com/0;>


代码已上传: http://download.csdn.net/detail/robertkun/7421767