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在 DOS 下使用Windows *.WAV 文件毕业论文(2)

2015-06-05 02:33
else
{
i=inportb(0x61);/*关扬*/
i=i&0x00fc;
outportb(0x61,i);/*声器*/
}
counter+=1;
enable();/*打开中断*/
if(counter>=datasize) counter=0;
outportb(0x20,0x20);
running=1;
}
}
void soundon()
{
clkdiv=1193180/filehead.samplespersec;
/*计算8253计数器0初始值*/
oldint8h=getvect(0x08);/*保存旧的08H中断向量*/
setvect(0x08,newint8h);/*置新的08H中断例程*/
outportb(0x43,0xB6);/*初始化*/
outportb(0x42,1);/*8253计数器3/
outportb(0x42,0)

;/*初始值*/
outportb(0x43,0x36); /*修改8253*/
outport(0x40,clkdiv&0x00ff);/*计数器0*/
outport(0x40,(clkdiv>>8)&0x00ff);/*初始值*/
}
void soundoff()
{
int i;
setvect(0x08,oldint8h);/*恢复旧的08H中断向量*/
outportb(0x43,0x36);/*恢复正常*/
outport(0x40,0)/*的时钟中*/
outport(0x40,0);/*断频率*/
i=inportb(0x61);/*关扬*/
i=i&0x00fc;
outportb(0x61,i);/*声器*/
}
void main(int argc, char *argv[])
{
long j;
int key;
char *s;
FILE *fp;/
if(argc==1)
{
printf("%s\n","And The WAV Filename In Command Line!");
exit(0);
}
else
{
if ((fp=fopen(argv[l],"rb"))==NULL)
{
printf("Cannot open the Data file %s\n",argv[1];
exit(0);
}
}
if(fread(&filehead,sizeof(struct wave-file-head),1,fp)==NULL)
{
printf("File Read Error!\n");
exit(0);
}
fseek(fp,4,SEEK-CUR);
fread(&datasize,4,1,fp);
for(j=0;jclose(fp);
printf("%s\n","Now Sound On, Press ESC to Stop!");
soundon();
for(;;)
{
key=getch();
if(key==27)
{
soundoff();
printf("%s\n","Sound off!");

break;
}
}
}