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Date: Sat, 20 Oct 2001 23:50:14 -0400
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
Message-ID: <20011020235014.D28304@redhat.com>
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References: <20011020122946 DOT A6118 AT redhat DOT com> <000501c15997$b069ebf0$9a6707d5 AT BRAMSCHE>
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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.
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