On Tue, 25 Jun 2002, [EMAIL PROTECTED] wrote:
> Hi all,
>
> I'm using a Terratex DMX Xfire soundcard (based on the Cirrus CS4624) on my
> Mandrake 8.1 PC.
> I've written a small real-time program using the ALSA-API (capturing from
> the input of the card, processing the samples in some way and playing them
> through the output of the soundcard). (The CPU load caused by this program is
> about 1%.)
>
> I've written the following to set the period size of the capture device (and
> the same for the playback device as well):
>
> chunk_size = snd_pcm_hw_params_set_period_size_near(handle, hwparams,
> chunk_size_w, 0);
> if (chunk_size < 0){
> fprintf(stderr, "error setting period size: %s\n", snd_strerror(err));
> return -1;
> }
>
> As the program causes broken pipe errors sometimes, I tried to increase the
> period size.
> But using my soundcard I always get a period size of 512. I've tried several
> device definitions like hw:0,0 and plughw:0,0, but no success. I've used a
> buffer size of 1024 or 16384 in my experiments.
> Using another PC using a Ensoniq AudioPCI ES1371 soundcard I can set the
> period size to e.g. 1024 without any problems or changes to my source code.
>
> Is this a problem regarding the CS46xx driver or do I have to change my
> program code?
We have only limited firmware for CS46xx chips with fixed period size
(2048 bytes).
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project http://www.alsa-project.org
SuSE Linux http://www.suse.com
-------------------------------------------------------
This sf.net email is sponsored by: Jabber Inc.
Don't miss the IM event of the season | Special offer for OSDN members!
JabConf 2002, Aug. 20-22, Keystone, CO http://www.jabberconf.com/osdn
_______________________________________________
Alsa-devel mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/alsa-devel
