• Registered: 2013-06-02
  • Posts: 5

Topic: hdspe madi @ 192K

I was using a hdspe madi and rme D/a 16.     With a 48K sample rate, all works well.

When using a 192K sample rate (quad speed).   I will only see 4 of the analog output
channels.   The channels will be output on analog channels 1,5,9,13.     I can control
these 4 channels.     But there is the odd mapping.

Can anyone explain this effect of (1->1,2->5,3->9,4->13) channel mapping and what
configuration may be incorrect.


-Paul

  • sonik
  • AD/DA expert
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  • Registered: 2013-04-18
  • Posts: 70

Re: hdspe madi @ 192K

hey, looks like what i experienced with two hdsp-cards in 96k explained in this thread:
http://www.rme-audio.de/forum/viewtopic.php?id=17373
actually, as soon as i open hdsp-mixer when at 96k, i lose the half of my channels.

  • Registered: 2013-06-02
  • Posts: 5

Re: hdspe madi @ 192K

I found that the  snd_pcm_hw_params_set_access call must be set to SND_PCM_ACCESS_MMAP_NONINTERLEAVED for the 192K
to work on hdsp madi driver.      With the ACCESS_RW_NONINTERLEAVED setting, the channels spread into blocks of 4 or blocks of 2 for 96K with empty data channels in the middle.


-Paul

  • sonik
  • AD/DA expert
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  • Registered: 2013-04-18
  • Posts: 70

Re: hdspe madi @ 192K

I found that the  snd_pcm_hw_params_set_access call must be set to SND_PCM_ACCESS_MMAP_NONINTERLEAVED for the 192K

how do you do that?
I would be interested to know if this could work for the hdsp-driver.