#include
#include
#include
#include
#include
#include
#include
//录音时间
#define LENGTH 3
//采样频率
#define RATE 8000
//量化位数
#define SIZE 16
//声道数目
#define CHANNELS 2
//保存录音的音频数据
unsigned char buf[LENGTH*RATE*SIZE*CHANNELS/8];
int main(void){
//声音设备的文件描述符
int fd;
int arg;
//用于保存ioctl的返回值
int status;
//打开声音设备
fd=open("/dev/dsp",O_RDWR);
if(fd<0){
perror("Cannot open /dev/dsp device");
return 1;
}
//以下设置声卡参数
//设置采样时的量化位数
arg=SIZE;
status=ioctl(fd,SOUND_PCM_WRITE_BITS,&arg);
if(status==-1){
perror("Cannot set SOUND_PCM_WRITE_BITS");
return 1;
}
//设置采样声道数目
arg=CHANNELS;
status=ioctl(fd,SOUND_PCM_WRITE_CHANNELS,&arg);
if(status==-1){
perror("Cannot set SOUND_PCM_WRITE_CHANNELS");
return 1;
}
//设置采样频率
arg=RATE;
status=ioctl(fd,SOUND_PCM_WRITE_RATE,&arg);
if(status==-1){
perror("Cannot set SOUND_PCM_WRITE_RATE");
return 1;
}
//一直录音，直到按下“ Control-C”停止
while(1){
printf("Recording ...:\n");
status=read(fd,buf,sizeof(buf));
if(status==-1){
perror("read wrong number of bytes");
}
printf("Play ...:\n");
status=write(fd,buf,sizeof(buf));
if(status != sizeof(buf)) perror("wrote wrong number of bytes");
//在继续录音前等待回放结束
status=ioctl(fd,SOUND_PCM_SYNC,0);
if(status==-1) perror("Cannot set SOUND_PCM_SYNC");
}
return 0;
}
怎么回访没有声音？？？？