On Fri, 27 Jan 2006, satish wrote:
On Fri, 2006-01-27 at 13:02 +0000, James Courtier-Dutton wrote:
satish wrote:
Hi All,
I got ALSA driver version 1.0.6 installed on my computer.
I used the API to write very simple recording and playing programs.
But I can't seem to get both recording and playing to work at the
same time. I can open the audio device for both recording and
playing,
and set up (some) hardware parameters for both recording and playing.
But I can only run
snd_pcm_hw_params()
either on the recording side *or* the playback side only once.
Regardless of the order the 2nd call to snd_pcm_hw_params() fails.
Use a different file descriptor for playback and capture.
I.e. 2 file descriptors.
Don't open a single file descriptor as full-duplex.
James
Thanx for the response James, but still the problem persists.
As an alternative, i tried using capture and playback in different time
intervals, instead of full duplex
eventhough in my 2nd call to snd_pcm_hw_params() i'm getting this
error message
"unable to set hw parameters: Invalid argument"
What he means is to have two open or fopen calls one for reading and one
for writing so that you get a read file descriptor and a write file
descriptor. Do not try to use the same one for both reading and writing.
Do not make a second call to the same file.
--
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Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | [EMAIL PROTECTED]
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