Re: SPDIF and cs46xx ?

[Benny Sjostrand <gorm@cucumelo.org>]

>
>
>??? No, the only reference I found about this option is regarding OSS
>(http://alsa.opensrc.org/index.php?page=cs46xx) and I never thought it
>was of any use for me...
>I have added
>options snd-cs46xx mmap_valid=1
>to my /etc/modules.conf and done an /etc/init.d/alsa restart without any
>change, so I try a /etc/init.d/alsa stop and checked that's there is no
>more alsa modules loaded at all and do a
>modprobe snd-cs46xx mmap_valid=1
>
>  
>
Adding it to modules.conf should be enough, that does not seems to be 
the problem anyway. So:

        if ((err = snd_pcm_hw_params_set_period_size(out, hwparams, 
MMAP_BURST, 0)) < 0) {
!!        esyslog("S/P-DIF: Period size not available: %s", 
snd_strerror(err));
        period_size = 0;
        goto err_out;
        }
        // function returns less than 0 on error or greater than 0
        if ((err = snd_pcm_hw_params_set_buffer_size_near(out, hwparams, 
burst_size*periods)) < 0) {
        esyslog("S/P-DIF: Buffer size not available: %s", 
snd_strerror(err));
        goto err_out;
        }
    } else {
        frag = 1;

        // function returns less than 0 on error or greater than 0
        if ((err = snd_pcm_hw_params_set_period_size(out, hwparams, 
burst_size, 0)) < 0) {
 !!       esyslog("S/P-DIF: Period size not available: %s", 
snd_strerror(err));
        period_size = 0;
        goto err_out;
        }

It seems to be the snd_pcm_hw_params_set_period_size(...) that fails, it 
seems to be two possible places where this function is called.
I guess there's a constraint in the cs46xx driver which does not allow 
the desired period settings, maybe someone with more knowledge about the 
alsa-lib  can help us figure out what ??

/Benny




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