Re: Opening dev/dsp takes very long

[Lars Heineken <Lars.Heineken@gmx.de>]

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>      0.000531 ioctl(4, SNDCTL_DSP_RESET, 0) = 0
>      0.000232 ioctl(4, SNDCTL_DSP_GETFMTS, 0xbffff668) = 0
>      0.510506 ioctl(4, SNDCTL_DSP_SETFMT, 0xbffff668) = 0
>      0.506515 ioctl(4, SNDCTL_DSP_STEREO, 0xbffff668) = 0
>      0.504940 ioctl(4, SOUND_PCM_READ_RATE, 0xbffff668) = 0
>      0.065604 ioctl(4, SNDCTL_DSP_GETBLKSIZE, 0x80a5824) = 0
>      0.000302 ioctl(4, SNDCTL_DSP_SYNC, 0) = 0
>      0.000250 munmap(0x40016000, 4096)  = 0 



The output is from executing this line:

strace -r sox 01.wav -t ossdsp /dev/dsp

As each and every oss-program on my machine suffers from this unusual 
delay I think it doesn't make much sense to write a sample program, but 
anyway, it's attached.

Regards,

Lars.





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#include "stdio.h"

#include <sys/soundcard.h>
#include <unistd.h>
#include <fcntl.h>

main() {
	int file;
	
	file = open("/dev/dsp", O_RDWR, 0);

	ioctl(file, SNDCTL_DSP_RESET, 0);
	ioctl(file, SNDCTL_TMR_TIMEBASE, 0xbffff4d0);	

	ioctl(file, SNDCTL_DSP_GETFMTS, 0xbffff668);
	ioctl(file, SNDCTL_DSP_SETFMT, 0xbffff668);
	ioctl(file, SNDCTL_DSP_STEREO, 0xbffff668);
	ioctl(file, SOUND_PCM_READ_RATE, 0xbffff668);
	ioctl(file, SNDCTL_DSP_GETBLKSIZE, 0x80a5824);
	ioctl(file, SNDCTL_DSP_SYNC, 0);

	close(file);
					      
}