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Re: sound support more info - kde2 porting status
- To: cygwin-xfree at cygwin dot com
- Subject: Re: sound support more info - kde2 porting status
- From: Christopher Faylor <cgf at redhat dot com>
- Date: Sat, 20 Oct 2001 23:50:14 -0400
- Cc: cygwin-developers at cygwin dot com
- References: <20011020122946.A6118@redhat.com> <000501c15997$b069ebf0$9a6707d5@BRAMSCHE>
- Reply-To: cygwin-xfree at cygwin dot com
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@cygnus.com Red Hat, Inc.
http://sources.redhat.com/ http://www.redhat.com/