listen.c

s3c2410IIS总线实验代码 实现录音以及放音功能

#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <stdio.h>
#include<string.h>
#include <linux/soundcard.h>

#define RATE 44000
#define SIZE 16
#define CHANNELS 1

int main(int argc,char * argv[])
{
	int id,fd;
	int arg;
	int status;
	char buf[1024];

	if((id = open("/dev/dsp",O_WRONLY)) < 0 )
	{
		printf("Can't open sound device!\n");
		exit(1);
	}

	if((fd = open(argv[1],O_RDWR)) < 0)
	{
		printf("Can't open output file!\n");
		exit (1);
	}

	arg = SIZE;
  	status = ioctl(id,SOUND_PCM_WRITE_BITS,&arg);
  	if(status == -1)
  		printf("SOUND_PCM_WRITE_BITS ioctl failed\n");
  	if(arg != SIZE)
  		printf("unable to set sample size\n");

	arg = CHANNELS; 
  	status = ioctl(id,SOUND_PCM_WRITE_CHANNELS,&arg);
  	if(status == -1)
    		printf("SOUND_PCM_WRITE_CHANNELS ioctl failed\n");
  	if(arg != CHANNELS)
    		printf("unable to set number of channels\n");

	arg = RATE;
  	status = ioctl(id,SOUND_PCM_WRITE_RATE,&arg);
  	if(status == -1)
    		printf("SOUND_PCM_WRITE_WRITE ioctl failed\n");

	while(read(fd,buf,sizeof(buf)) > 0)
		write(id,buf,sizeof(buf));

	close(fd);
	close(id);
}