[linux-audio-dev] RME Hammerfall DSP Cardbus+Multiface

D. Sen dsen at homemail.com
Thu Dec 19 11:43:01 UTC 2002


I think you mis-read my email. I said I *do* set line_outs_monitor=1 
(and still get silence)



Paul Davis wrote:
>>Hmm I do use line_outs_monitor=1 as a module option on loading snd-hdsp. 
> 
> 
> by editing /etc/modules.conf or its equivalent on your system, and
> adding:
> 
> 	options snd_hdsp line_outs_monitor=1
> 
> this will take effect the next time the snd-hdsp driver is loaded.
> 
> 
>>gamix shows that all the channel volumes are loud enough....The various 
>>'play' (aplay, etc) doesnt complain (keeps on playing stuff without 
>>falling out) yet all I hear is silence.
>>
>>gamix shows the 'passthrough" to be disabled. Is that some indication of 
>>whats going on?
> 
> 
> no, i told you already: if line_outs_monitor isn't set to a non-zero
> value, then *nothing* will be routed out of the line out channels. if
> its set to a non-zero value, then all playback and input channels will
> be sent to the 2 line out channels at unity gain, mapped using a
> conventional stereo setup.
> 
> the only controls that gamix shows are a small set created
> specifically to allow limited control from the existing set of linux
> "mixer" apps. they control *only* the volume of the computer-generated
> data stream (0..N) sent to the matching output (0..N). they do not
> affect any other aspect of this extremely powerful mixer.
> 
> 
>>How do I play something out through the SPDIF/optical or ADAT ports?
> 
> 
> you have to define this question more precisely. using the "plughw"
> device will duplicate the signals across all channels. its extremely
> unlikely you can use the "hw" method, since this requires
> non-interleaved, 24-in-32 bit, 26 channel sound, and i doubt you have
> any files like this on your system. this is a generic ALSA question,
> and one that needs (like most of ALSA) to be better documented. the
> "hw" access method requires a hardware configuration (sample rate,
> sample bit width, interleaving, channel count) that is directly
> supported by the hardware - no format conversion is done by ALSA at
> all. by contrast, the "plughw" access method will convert between just
> about any requested format (eg. stereo 16 bit interleaved data) and
> something supported by the hardware. i repeat: this has nothing to do
> with the hammerfall - it applies to all ALSA support devices. the same
> is true about the methods of defining devices corresponding to
> specific output channels. this is a generic ALSA question, and i don't
> have time right now to answer it.
> 
> --p
> 

-- 
---------------------------------------
D. Sen, PhD
21 Woodmont Drive
Randolph
NJ 07869
Home Email: dsen at homemail.com   Tel: 973 216 2326
Work Email: dsen at ieee.org       Web: http://www.auditorymodels.org/~dsen




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