现在我用S3C2410在linux环境下开发音频部分，播放功能可以正常实现，但是录音部分有问题，具体问题是把PC上Linux环境下的录音程序移植到ARM上，它的执行速度要比PC上快10倍左右，不知道是哪里出现了问题？有相关经历的请指点一下。谢谢～
录音程序如下：
#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 RATE 8000
#define SIZE 16
#define CHANNELS 1
#define AUDIO_DEVICE "/dev/dsp"
void delay(int i)
{
while(i--);
}
int main(int argc,char * argv[])
{
int fd,id,i=50,j=0;
int arg;
int status;
char filename[30] ="record.wav";
char buf[1024];
if((id = open(filename, O_RDWR | O_CREAT)) < 0)
{
printf("Can't open output file!\n");
exit (1);
}
if ((fd = open(AUDIO_DEVICE, O_RDWR | O_NONBLOCK)) < 0)
{
printf("open of /dev/dsp failed");
exit(1);
}
fcntl (fd, F_SETFL, fcntl (fd, F_GETFL) & ~O_NONBLOCK);
arg = SIZE;
status = ioctl(fd,SOUND_PCM_WRITE_BITS,&arg);
if(status == -1)
printf("SOUND_PCM_WRITE_BITS ioctl failed");
if(arg != SIZE)
printf("unable to set sample size");
arg = CHANNELS;
status = ioctl(fd,SOUND_PCM_WRITE_CHANNELS,&arg);
if(status == -1)
printf("SOUND_PCM_WRITE_CHANNELS ioctl failed");
if(arg != CHANNELS)
printf("unable to set number of channels");
arg = RATE;
status = ioctl(fd,SOUND_PCM_WRITE_RATE,&arg);
if(status == -1)
printf("SOUND_PCM_WRITE_RATE ioctl failed");
printf("Say something:\n");
while(i--)
{
read(fd,buf,sizeof(buf));
write(id,buf,sizeof(buf));
printf("you are saying %d\n",j++);
}
close(id);
close(fd);
return 0;
} |
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