highest sample rate on rme32

highest sample rate on rme32

[Martin Langer]

Hi,

my rme32 hardware can capture signals with 32/44.1/48 kHz and it's working
fine for 32 and 44.1 signals on input. The funny thing happened with 48kHz
on input. 

Having 48kHz at spdif-input I can record that signal with higher rates like
64/88.2/96 kHz. These commands were possible without getting error messages;
keep in mind that the hardware isn't be able to do it:

arecord -fS16_LE -c2 -r64000 /tmp/test.wav
arecord -fS16_LE -c2 -r88200 /tmp/test.wav
arecord -fS16_LE -c2 -r96000 /tmp/test.wav

And 32 and 44.1 signals doesn't allow higher sample rates for capturing. No
error occured there.

Because I haven't defined such high sample rates for capturing in rme32.c 
I think that bug is somewhere else. What about other cards? Do they have a 
similar problem or is it just rme32 specific.


thanks,
martin


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Re: highest sample rate on rme32

[Martin Langer]

[-- Attachment #1: Type: text/plain, Size: 490 bytes --]

On Tue, Sep 17, 2002 at 11:24:04AM +0200, Martin Langer wrote:
> 
> my rme32 hardware can capture signals with 32/44.1/48 kHz and it's working
> fine for 32 and 44.1 signals on input. The funny thing happened with 48kHz
> on input. 
> 

Nevertheless the late Digi32 Pro cards with CS8414 should capture 88.2 and
96kHz data without problems. This patch enables it. 

BTW, the Cirrus CS8414 specs doesn't talk about 64kHz! IMHO the card can only
play and not capture 64kHz samples. 


martin

[-- Attachment #2: rme32.diff --]
[-- Type: text/plain, Size: 438 bytes --]

--- /tmp/rme32.c	Tue Sep 17 14:38:45 2002
+++ alsa-kernel/pci/rme32.c	Tue Sep 17 14:33:12 2002
@@ -859,6 +859,10 @@
 	spin_unlock_irqrestore(&rme32->lock, flags);
 
 	runtime->hw = snd_rme32_capture_spdif_info;
+	if (RME32_PRO_WITH_8414(rme32)) {
+		runtime->hw.rates |= SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000;
+		runtime->hw.rate_max = 96000;
+	}
 
 	snd_pcm_hw_constraint_minmax(runtime,
 				     SNDRV_PCM_HW_PARAM_BUFFER_BYTES,

Re: highest sample rate on rme32

[Takashi Iwai]

At Tue, 17 Sep 2002 15:05:48 +0200,
Martin Langer wrote:
> 
> [1  <text/plain; us-ascii (7bit)>]
> On Tue, Sep 17, 2002 at 11:24:04AM +0200, Martin Langer wrote:
> > 
> > my rme32 hardware can capture signals with 32/44.1/48 kHz and it's working
> > fine for 32 and 44.1 signals on input. The funny thing happened with 48kHz
> > on input. 
> > 
> 
> Nevertheless the late Digi32 Pro cards with CS8414 should capture 88.2 and
> 96kHz data without problems. This patch enables it. 

applied.  thanks.


Takashi


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