Mail Archives: cygwin-developers/2001/11/03/12:08:59
Are there no takers for this?
Isn't anyone interested in improving cygwin by undertaking a simple
project?
cgf
----- Forwarded message from Christopher Faylor <cgf AT redhat DOT com> -----
From: Christopher Faylor <cgf AT redhat DOT com>
To: cygwin-xfree AT cygwin DOT com
Cc: cygwin-developers AT cygwin DOT com
Subject: Re: sound support more info - kde2 porting status
Date: Sat, 20 Oct 2001 23:50:14 -0400
Reply-To: cygwin-xfree AT cygwin DOT com
Mail-Followup-To: cygwin-xfree AT cygwin DOT com, cygwin-developers AT cygwin DOT com
In-Reply-To: <000501c15997$b069ebf0$9a6707d5 AT BRAMSCHE>
On Sat, Oct 20, 2001 at 08:47:37PM +0200, Ralf Habacker wrote:
><snip>
>>
>> >6. the sound support of cygwin isn't ready. Especially setting
>> > of audio buffer size from an application is a problem.
>> > Look in the thread about the rocksndiamond game started with
>> > http://sources.redhat.com/ml/cygwin-xfree/2001-q4/msg00171.html.
>>
>> I didn't see anything which actually set the blocksize in the code
>> fragment that you sent to cygwin-apps. I just saw code which read the
>> block size and said "this should return 512". But, cygwin uses a larger
>> buffer than that. I don't actually see an ioctl for setting the block
>> size under linux, but maybe I missed something.
Duh. You even mentioned this in your email. Sorry for missing it.
This looks like more than a simple fix to the fhandler_dsp.cc code but it
should be pretty easy if anyone wants to tackle it?
Anyone interested in implementing SNDCTL_DSP_SETFRAGMENT?
cgf
>
>It's called the fragment size and uses the SNDCTL_DSP_SETFRAGMENT ioctl call.
>It seems that the lower word contains the log2 of the buffer size and in the
>higher word the number of buffers are set. Currently Cygwin ignores this call.
>
> /* Example for fragment specification:
> - 2 buffers / 512 bytes (giving 1/16 second resolution for 8 kHz)
> - (with stereo the effective buffer size will shrink to 256)
> => fragment_size = 0x00020009 */
>
> if (ioctl(audio.device_fd,SNDCTL_DSP_SETFRAGMENT,&fragment_spec) < 0)
> Error(ERR_EXIT_SOUND_SERVER,
> "cannot set fragment size of /dev/dsp - no sounds");
>
>Ralf
--
cgf AT cygnus DOT com Red Hat, Inc.
http://sources.redhat.com/ http://www.redhat.com/
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