Re: [Jack-Devel] wrong samplerate

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Date	Mon, 28 Apr 2014 15:55:35 +0200
From	Adrian Knoth <[hidden] at drcomp dot erfurt dot thur dot de>
To	[hidden] at lists dot jackaudio dot org
In-Reply-To	Leonardo Gabrielli [Jack-Devel] wrong samplerate
Follow-Up	Paul Davis Re: [Jack-Devel] wrong samplerate

On Mon, Apr 28, 2014 at 03:37:56PM +0200, Leonardo Gabrielli wrote:

> Dear devels,

Hi!

> I compiled the latest jack2 from git on an old debian laptop and I'm
> getting contradictory messages about the sample rate:
> 
> cmdline:
> jackd -dalsa -dhw:0 -r44100 -p128 -n2
> 
> output during launch:
> creating alsa driver ... hw:0|hw:0|128|2|44100|0|0|nomon|swmeter|-|32bit
> output of jack_samplerate: 48000
> 
> the real sample rate is 48000
> Do you think this is dependent on the sound card, ALSA or Jack?

        frame_rate = driver->frame_rate ;
        err = snd_pcm_hw_params_set_rate_near (handle, hw_params,
                                               &frame_rate, NULL) ;
        driver->frame_rate = frame_rate ;
        if (err < 0) {


and then

   https://gitorious.org/sigrok/libsigrok/commit/0d6ff1039447c35fa8b423ee02468e62a5064cab

There are devices which only support 48k (no 44.1k), so this might be
the case here.

I'm not entirely sure whether it's a good idea to use
snd_pcm_hw_set_rate() instead.


Cheers

-- 
mail: [hidden]  	http://adi.thur.de	PGP/GPG: key via keyserver

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