[PATCH] pmac 48kHz sample rate not function -> disable

[PATCH] pmac 48kHz sample rate not function -> disable

[Rene Rebe]

[-- Attachment #1: Type: text/plain, Size: 465 bytes --]

Hi all,

48kHz sample rate is not functional - at least with all iBook2s I have 
access to. The hardware just does 44.1kHz instead. I have cross checking 
the Darwin source - but as far as I have seen it also does not support 
higher rates then 44.1kHz. Strange is, that any bit combination written 
does result in 44.1kHz. Maybe someone with access to the spec can 
implement it correctly - if the hardware does support something different.

Have fun,
  René Rebe

[-- Attachment #2: alsa-pmac3.patch --]
[-- Type: text/plain, Size: 602 bytes --]

--- ppc/pmac.c.orig	2004-08-01 01:09:36.820879352 +0200
+++ ppc/pmac.c	2004-07-31 17:40:45.512859128 +0200
@@ -53,7 +53,7 @@
 };
 /* fixed frequency table for tumbler */
 static int tumbler_freqs[2] = {
-	48000, 44100
+	/*48000,*/ 44100
 };
 
 /*
@@ -494,14 +494,14 @@
 	snd_pcm_runtime_t *runtime = subs->runtime;
 	int i, j, fflags;
 	static int typical_freqs[] = {
-		48000,
+		/*48000,*/
 		44100,
 		22050,
 		11025,
 		0,
 	};
 	static int typical_freq_flags[] = {
-		SNDRV_PCM_RATE_48000,
+		/*SNDRV_PCM_RATE_48000,*/
 		SNDRV_PCM_RATE_44100,
 		SNDRV_PCM_RATE_22050,
 		SNDRV_PCM_RATE_11025,

Re: [PATCH] pmac 48kHz sample rate not function -> disable

[Takashi Iwai]

At Fri, 30 Jul 2004 16:56:44 +0200,
Rene Rebe wrote:
> 
> Hi all,
> 
> 48kHz sample rate is not functional - at least with all iBook2s I have 
> access to. The hardware just does 44.1kHz instead. I have cross checking 
> the Darwin source - but as far as I have seen it also does not support 
> higher rates then 44.1kHz. Strange is, that any bit combination written 
> does result in 44.1kHz. Maybe someone with access to the spec can 
> implement it correctly - if the hardware does support something different.

I guess it's iBook2-specific.  Any other users?


Takashi


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Re: [PATCH] pmac 48kHz sample rate not function -> disable

[Niklas Werner]

On Mon, 02 Aug 2004 22:49, Takashi Iwai wrote:
> At Fri, 30 Jul 2004 16:56:44 +0200,
>
> Rene Rebe wrote:
> > Hi all,
> >
> > 48kHz sample rate is not functional - at least with all iBook2s I
> > have access to. The hardware just does 44.1kHz instead. I have cross
> > checking the Darwin source - but as far as I have seen it also does
> > not support higher rates then 44.1kHz. Strange is, that any bit
> > combination written does result in 44.1kHz. Maybe someone with access
> > to the spec can implement it correctly - if the hardware does support
> > something different.
>
> I guess it's iBook2-specific.  Any other users?
AFAIK, none of the pmac chips supports anything other than 44.1kHz. In OS 
X CoreAudio takes care of resampling, I think...



Cheers,

Niklas
--
Computer Music PhD-student
University of Waikato
Hamilton
New Zealand


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Re: [PATCH] pmac 48kHz sample rate not function -> disable

[Takashi Iwai]

At Wed, 4 Aug 2004 09:49:48 +1200,
Niklas Werner wrote:
> 
> On Mon, 02 Aug 2004 22:49, Takashi Iwai wrote:
> > At Fri, 30 Jul 2004 16:56:44 +0200,
> >
> > Rene Rebe wrote:
> > > Hi all,
> > >
> > > 48kHz sample rate is not functional - at least with all iBook2s I
> > > have access to. The hardware just does 44.1kHz instead. I have cross
> > > checking the Darwin source - but as far as I have seen it also does
> > > not support higher rates then 44.1kHz. Strange is, that any bit
> > > combination written does result in 44.1kHz. Maybe someone with access
> > > to the spec can implement it correctly - if the hardware does support
> > > something different.
> >
> > I guess it's iBook2-specific.  Any other users?
> AFAIK, none of the pmac chips supports anything other than 44.1kHz. In OS 
> X CoreAudio takes care of resampling, I think...

Ok then let's remove it.


thanks,

Takashi


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