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Date: Mon, 27 Sep 1999 16:00:27 -0700 (PDT)
From: youki@center.osaka-u.ac.jp
To: freebsd-gnats-submit@freebsd.org
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Subject: kern/14006: pas2_pcm.c pcm playback problem, with fix
Sender: owner-freebsd-bugs@FreeBSD.ORG
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>Number:         14006
>Category:       kern
>Synopsis:       pas2_pcm.c pcm playback problem, with fix
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 27 16:10:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Youki Kadobayashi
>Release:        3.3-RELEASE
>Organization:
Computation Center, Osaka University
>Environment:
FreeBSD xps3.aist-nara.ac.jp 3.3-RELEASE FreeBSD 3.3-RELEASE #6: Tue Sep 28 07:36:54 JST 1999     youki-k@xps3.aist-nara.ac.jp:/usr/src/kame/freebsd3/sys/compile/DELL.v6  i386

PC with PAS16 card
>Description:
pas2_pcm.c does not calculate sampling rate correctly.
As a result, stereo audio playback occurs at higher pitch.

>How-To-Repeat:
mpg123 someaudiofile.mp3

>Fix:
I verified the following patch fixes the problem.

*** /sys/i386/isa/sound/pas2_pcm.c.bak  Thu Jul 29 21:36:54 1999
--- /sys/i386/isa/sound/pas2_pcm.c      Tue Sep 28 07:41:32 1999
***************
*** 66,77 ****
        if (arg < 5000)
                arg = 5000;
  
-       foo = (1193180 + (arg / 2)) / arg;
-       arg = 1193180 / foo;
- 
        if (pcm_channels & 2)
!               foo = foo >> 1;
  
        pcm_speed = arg;
  
        tmp = pas_read(FILTER_FREQUENCY);
--- 66,77 ----
        if (arg < 5000)
                arg = 5000;
  
        if (pcm_channels & 2)
!               foo = (1193180 + arg) / (arg * 2);
!       else
!               foo = (1193180 + (arg / 2)) / arg;
  
+       arg = 1193180 / foo;
        pcm_speed = arg;
  
        tmp = pas_read(FILTER_FREQUENCY);

>Release-Note:
>Audit-Trail:
>Unformatted:


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