wavplay.cpp

来自「用QT,designer编写的游戏」· C++ 代码 · 共 100 行

#include "wavplay.h"

WavePlay::WavePlay(int bufSize, QString deviceName):QObject()
{
	sndFd = open((const char *)deviceName, O_WRONLY);
	place = sizeof(WH);
	buffer = NULL;
	fileSize = 0;
	bufferSize = bufSize;
	wavFd = -1;
	playState = 0;
}
WavePlay::~WavePlay()
{
	if(buffer) munmap(buffer, fileSize);
	if(sndFd) close(sndFd);
	if(wavFd >= 0) close(wavFd);
}


void WavePlay::readWaveHead()
{
	pHead = (WH *)buffer;
}
void WavePlay::soundCardCtl()
{

	int tmp;

	ioctl(sndFd, SNDCTL_DSP_RESET) ;	//soundcard init
	tmp = pHead->bits;
	ioctl(sndFd, SNDCTL_DSP_SETFMT, (char *)&tmp); //set sound format
	tmp = pHead->channel;
	ioctl(sndFd, SNDCTL_DSP_CHANNELS, (char *)&tmp);//set channel
	tmp = pHead->rate;
	ioctl(sndFd, SNDCTL_DSP_SPEED, (char *)&tmp);	//set sound bps

}

void WavePlay::openSound(QString fName)
{
	fileName = fName;
	if(fileName == QString("") || ! QFile::exists(fileName))
		return;
	if(fileName.right(4) != QString(".wav"))
		return;
	wavFd = open((const char *)fileName, O_RDWR);
	QFile *f = new QFile(fileName);
	fileSize = f->size();
	buffer = (unsigned char *)mmap(0, fileSize, PROT_READ | PROT_WRITE,
				MAP_SHARED, wavFd, 0);
	free(f);
	place = sizeof(WH);
	readWaveHead();
	soundCardCtl();
}
void WavePlay::closeSound()
{}
void WavePlay::play()
{
	while(place < fileSize)
	{
		if(playState == 0)
		{
			place += write(sndFd, buffer + place,  bufferSize);
			emit placeChanged(100 * (place - sizeof(WH)) 
							/ (fileSize - sizeof(WH)));
		}else if(playState == 1)
		{
			closeSound();
			return;
		}else if(playState == 2)
		{
			QTimer::singleShot(200, this, SLOT(play()));
		}
	}
}
void WavePlay::pause()
{
	playState = 2;
}
void WavePlay::stop()
{
	playState = 1;
}
void WavePlay::forward(){}
void WavePlay::backward(){}
void WavePlay::setPlace(){}

//int main(int argc, char *argv[])
//{
//	WavePlay wp;
//	wp.openSound(argv[1]);
//	qDebug("ssssssssssssssss");
//	wp.play();
//	qDebug("ssssssssssssssss");
//	wp.stop();
//}