Subject: Re: full duplex programming
From: Jaroslav Kysela (perex_AT_jcu.cz)
Date: pe tammi 15 1999 - 15:25:20 EST
On Wed, 28 Oct 1998, Patanjali wrote:
> I would like to do a program
> which reads, processes and writes
> suond using the full duplex capabilities of
> the SB 16 and my ALSA driver.
>
> how do i go about it ?
> currently i am doing something like :
> while(1)
> {
> read some bytes into buffer;
> write same bytes into buffer; // write only number of bytes actually read
> }
>
> this code doesn't seem to be giving me the right results.
> the sound input doesn't always appear at the output,
> also the quality is very bad.
>
> is there any demo prog which does the above ?
Yes, look to alsa-lib/test/latency.c... Your algorithm is bad (playback
underruns)...
Jaroslav
-----
Jaroslav Kysela <perex_AT_jcu.cz>
Academic Computer Centre, University of South Bohemia
Branisovska 31, C. Budejovice, CZ-370 05 Czech Republic
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