Andrew Armstrong,davinci-linux-open-source，你好
yes, that is not your problem, it is a soundcard driver bug.
[EMAIL PROTECTED]
2008-06-24
----- Original Message -----
From: Andrew Armstrong
To: davinci-linux-open-source
Sent: 2008-06-24, 17:41:19
Subject: Buggy Audio Driver
Hi Guys,
I have been playing with the audio driver. All I want to do is a simple
loopthrough function, however, I am finding that the driver locks up
quite randomly when its file handles are being closed.
Has anyone else come up with this issue? I have attached the function I
am playing with, if anyone can replicate the issue I would be most
interested. Sometimes it can run several times with no issue and other
times lock-up each time it is executed.
Regards,
Andrew
void audioloop(unsigned char timesecs)
{
int fdr;
int fdw;
unsigned char buffer[64];
unsigned char done = 0;
if( (fdr=open("/dev/sound/dsp",O_RDONLY)) < 0)
{
printf( "Sound Input Port failed!\n");
}
else
{
if( (fdw=open("/dev/sound/dsp",O_WRONLY)) < 0)
{
printf( "Sound Output Port failed!\n");
}
else
{
time(&starttime);
while (done==0)
{
read(fdr,buffer,64);
ioctl(fdr, SOUND_PCM_SYNC, 0);
write(fdw,buffer,64);
if (timesecs > 0)
{
time(¤ttime);
if ((int)(currenttime - starttime) > timesecs)
{
done=1;
}
}
}
close (fdr);
}
printf( "Closing sound port ...\n");
close (fdw);
printf( "... Done\n");
}
}
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