record.c

uda1341 linux driver for s3c2440.

/*   
 * 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>
#define LENGTH 5    /* 存储秒数 */
#define SIZE 16     /* 量化位数 */
#define CHANNELS 2  /* 声道数目 */
#define RATE 8000   /* 采样频率 */

/* 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()
{
  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 */
  int record_fd;

  record_fd = open("029.wav", O_RDWR);
  
  /* 打开声音设备 */
  fd = open("/dev/dsp", O_RDONLY);
  if (fd < 0) {
    perror("open of /dev/dsp failed");
    exit(1);
  }
  printf("sizeof buf= %d",sizeof(buf));
  /* 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 */
  while (1) {
    printf("Say something:\n");
    status = read(fd, buf, sizeof(buf)); /* 录音 */
    status = write(record_fd, buf, sizeof(buf));
    return 0;
    
	printf("sizeof buf= %d",sizeof(buf));
	if (status != sizeof(buf))
      perror("read wrong number of bytes");
	sleep(1);
	printf("You said:\n");
    status = write(fd, 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(fd, SOUND_PCM_SYNC, 0); 
    if (status == -1)
      perror("SOUND_PCM_SYNC ioctl failed");
  }
}