>thansk for the suggestion but i can use extern programs like aplay.  The
>reason is simple, i'm using an outputstream in java to output the pcm stream
>to /dev/dsp.  That's why i can't use the extern program and i can't call
>ioctl in my java program.

well, if you can access /dev/dsp in write mode from java, you'll be able
to write to any file, right? so just go and write to a fifo instead that
aplay reads the data from. if aplay can't do that, use ecasound. in short, 
i suppose you better look a little harder for a userspace solution.

if you still think you have to patch the driver, go ahead. i cannot tell
you where you'd do that, and again, i do not recommend it.

tim


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