/*
* sound.c
*/
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include <linux/soundcard.h>
//#include "sockpcm.h"
#define LENGTH 3 /* 存储秒数 */
#define RATE 8000 /* 采样频率 */
#define SIZE 16 /* 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 main(void)
{
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 */
fd = open("/dev/dsp", O_RDWR);
if (fd < 0) {
perror("open of /dev/dsp 1failed");
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");
/* 循环，直到按下Control-C */
status = ioctl(fd, SOUND_PCM_SYNC, 0);
if (status == -1)
perror("SOUND_PCM_SYNC ioctl failed");
/*
FILE *fp;
fp = fopen("recopcmfile","w");
if(fp==NULL) {
printf("creat file failed!\n");
exit 0;
}
*/
while (1) {
ioctl(fd, SOUND_PCM_SYNC, 0);
printf("Saying:\n");
status = read(fd, buf, sizeof(buf)); /* 录音 */
if (status != sizeof(buf))
printf("read wrong number of bytes");
else
printf("saying mun %d",sizeof(buf));
ioctl(fd, SOUND_PCM_SYNC, 0);
printf("Said:\n");
status = write(fd, buf, sizeof(buf)); /* 回放 */
if (status != sizeof(buf))
printf("wrote wrong number of bytes");
else
printf("saying mun %d",sizeof(buf));
}
//ioctl(fd, SOUND_PCM_SYNC, 0);
return 0;
}
