Re: [ecasound] Ecasound volume/EQ control

Hi Joel,

Thanks, I managed to control the Ecaserver using Python.
This is very good. I love the amount of control you have over the chains.
Brilliant.

kind regards,
Sjoerd Venema

On 19 April 2018 at 20:58, Sjoerd Venema <srg.venema@email-addr-hidden> wrote:

> Hi All,
>
> I am using Ecasound on a Raspberry Pi, which functions as a music player
> in my car and in a boombox.
> It has quite a variety of audio sources, which are all outputting into a
> Jack daemon.
>
> I’ve setup Ecasound to receive input from that Jack daemon, add an active
> filter, to spit out two mono signals, one for the sub and one for the
> woofer, and output to Alsa for playback on the speakers. This is the
> command I use:
> ecasound --server -z:nodb -z:mixmode,sum -a:pre -f:s32_le,2,44100 -i:jack
> -pf:/etc/pre.ecp -o:loop,1 -a:woofer,tweeter -i:loop,1 -a:woofer
> -pf:/etc/woofer.ecp -chorder:1,0 -a:tweeter -pf:/etc/tweeter.ecp
> -chorder:0,2 -a:woofer,tweeter -f:16,4,44100 -o:alsa
>
> So far, so good.
>
> Unfortunately, my Alsa output, a DAC, doesn’t have a volume control
> interface. Could (should?) I (ab)use Ecasound as a volume controller and
> as “simple consumer”-style equaliser?
> Or is Ecasound not intended for these things? And if so, would I need a
> (LADSPA?) plugin for this? If so, suggestions welcome ;-)
>
> (Jack doesn't have volume controls (the available plugins are all GUI, not
> suitable for my CLI-based Pi)).
>
> I have Pyecasound running, so ideally I’d control the EQ and Vol using the
> ECI commands using Python.
>
> In regards to volume control, I’ve found this message by Luke (
> http://nosignal.fi/ecasound-list/2007/09/0004.html). In a reply Kai
> suggest using cop-set on the amplification level to control volume. But
> (and this illustrates my lack of experience with Eca), cop-set requires a
> chain-op-id and param-id, how do I get these for the amplifier operator? Do
> I have to actively add this chain-op to my chain setup, or is it always
> there? Also, in the above setup the -ea switch couldn't be parsed by
> ecasound.
>
> Sorry for the “green” question ;-)
>
> Kind regards,
> Sjoerd Venema
>
>
>

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Received on Sun Jun 16 21:14:37 2019