Mail Archives: cygwin-developers/2001/11/14/02:46:03
Yea, I will give it a go......
Trevor
----- Original Message -----
From: "Christopher Faylor" <cgf AT redhat DOT com>
To: <cygwin-xfree AT cygwin DOT com>; <cygwin-developers AT cygwin DOT com>
Sent: Wednesday, November 14, 2001 2:00 PM
Subject: Re: sound support more info - kde2 porting status -- still looking
for a volunteer
> This would be trivial to implement.
>
> I'd appreciate it if someone would take a stab at implementing it.
>
> cgf
>
> On Sat, Oct 20, 2001 at 11:50:14PM -0400, Christopher Faylor wrote:
> >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/
>
> --
> cgf AT redhat DOT com Red Hat, Inc.
> http://sources.redhat.com/ http://www.redhat.com/
- Raw text -