24 bit pcm_meter ?

[Case van Rij <case@seattle.gii.net>]

I'm trying to write and/or use a meter plugin like ameter with the rme
hammerfall dsp/rme 9652 so much without much success, presumably because
of the 24 bit/non-interleaved format this card seems to internally (?) 

I noticed s16_enable( ) in alsa-lib/pcm_meter.c includes some support
for other slave pcm formats, would that (in theory) mean it should work
with the RME ? 

snd_pcm_scope_s16_open( ) does seem to work (it doesnt fail) but 
when running arecord 
pcm_mmap.c:137: snd_pcm_mmap_read_areas: 
Assertion `snd_pcm_mmap_capture_avail(pcm) >= size)`

snd_pcm_mmap_capture_avail returns 0 which shouldnt happen in
snd_pcm_mmap_read_areas() .. im trying to determine if this would be the
result of the format issue. 

So far attempts at using a plug with a fixed format as slave for ameter
have failed. 

pcm.short { 
    type plug; 
    slave { 
        pcm "hw:0,0" 
		format "S16_LE"
    }
}

pcm.ameter {
    type meter
#   slave.pcm 'hw:0,0'
    slave.pcm 'short'
    frequency 10
    scopes.0 ameter
}

Any ideas ? 

Thanks,
Case


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