simultaneous read write on soundcard?

bhushan · 12-26-2002, 10:32 PM

Hi everyone,
How do I simultaneously make a read() call on the soundcard i.e. /dev/dsp and also a write() call.I have open the device using the open() call with the RDWR flag, it either only reads or only writes.
My code works when i am only writing or reading but when i do them simultaneously using threads, I can't.

I have also tried opening the soundcard in NON_BLOCKING mode, with select call, but still it doesn;t work.

I have an I810 onboard soundcard.

please suggest me something
Thanks
Bhushan

mhearn · 12-29-2002, 12:45 PM

Make sure your card is actually capable of full duplex mode - some old/cheap cards are not. As an on board, it's a good candidate for not being able to do that.

bhushan · 12-30-2002, 09:16 PM

I have found that my Sound Card supports Full Duplex, but the sound driver which comes with kernel doesn't has Duplex Capabilties. so I installed OSS and the sound card now supports Full duplex, but OSS is a paid software.

any other alternatives?

mhearn · 12-31-2002, 06:47 AM

ALSA if you don't already use it. BTW, you might want to introduce spaces into your distro list in your profile, it's altering the layout of the page.