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#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include <linux/soundcard.h>
#define LENGTH 3 /* 存储秒数 */
#define RATE 22050 /* 采样频率 */
#define SIZE 8 /* 量化位数 */
#define CHANNELS 1 /* 声道数目 */
/* 用于保存数字音频数据的内存缓冲区 */
unsigned char buf[LENGTH*RATE*SIZE*CHANNELS/8];
int openDsp(int rd){
int fd; /* 声音设备的文件描述符 */
int arg; /* 用于ioctl调用的参数 */
int status; /* 系统调用的返回值 */
/* 打开声音设备 */
if(rd==0)
fd= open("/dev/dsp",O_RDONLY);
else
fd= open("/dev/dsp",O_WRONLY);
if (fd < 0) {
perror("open of /dev/dsp failed");
exit(1);
}
/* 设置采样时的量化位数 */
arg = SIZE;
status = ioctl(fd, SOUND_PCM_WRITE_BITS, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_BITS ioctl failed");
if (arg != SIZE)
perror("unable to set sample size");
/* 设置采样时的量化位数 */
arg = SIZE;
status = ioctl(fd, SOUND_PCM_WRITE_BITS, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_BITS ioctl failed");
if (arg != SIZE)
perror("unable to set sample size");
/* 设置采样时的声道数目 */
arg = CHANNELS;
status = ioctl(fd, SOUND_PCM_WRITE_CHANNELS, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_CHANNELS ioctl failed");
if (arg != CHANNELS)
perror("unable to set number of channels");
/* 设置采样时的采样频率 */
arg = RATE;
status = ioctl(fd, SOUND_PCM_WRITE_RATE, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_WRITE ioctl failed");
return fd;
}
int main()
{
int status;
/* 循环,直到按下Control-C */
while (1) {
memset(buf,0,sizeof(buf));
int fdread=openDsp(0);
printf("Say something:\n");
status = read(fdread, buf, sizeof(buf)); /* 录音 */
if (status != sizeof(buf))
perror("read wrong number of bytes");
status=close(fdread);
if(status==-1){
perror("close Read Dsp wrong");
exit(1);
}
int fdwrite=openDsp(1);
printf("You said:\n");
status = write(fdwrite, buf, sizeof(buf)); /* 回放 */
if (status != sizeof(buf))
perror("wrote wrong number of bytes");
/* 在继续录音前等待回放结束 */
status = ioctl(fdwrite, SOUND_PCM_SYNC, 0);
if (status == -1)
perror("SOUND_PCM_SYNC ioctl failed");
status=close(fdwrite);
if(status==-1){
perror("rclose Write Dsp wrong");
exit(1);
}
}
return 0;
}