Re: [Linuxsampler-devel] LSCP Protocols - Some confusion about mixing vs. channels

[Mark K. <mar...@gm...>]

On Wed, 9 Feb 2005 02:44:12 +0100, Christian Schoenebeck
<sch...@so...> wrote:
> Es geschah am Mittwoch 09 Februar 2005 02:00 als Mark Knecht schrieb:
> > c) Separate outputs for each gig come out but attach to separate
> > alsa_pcm:playback_XX channels. The audio is mixed in hardware with no
> > CPU overhead.
> 
> Well, just mixing does almost mean no cpu load. Memory bandwith will come more
> into weight.
> 
> > However when I run this I get some weird results. (I'm choosing to
> > leave the OK's in the listing in case someone needs them to count
> > commands.)
> >
> > QUESTIONS:
> >
> > 1) Why does the first gig say "AUDIO_OUTPUT_ROUTING: 6,1".  All the
> > others say "AUDIO_OUTPUT_ROUTING: 0,1"?
> >
> > 2) What the "Err:0:Unknown command."? If I count 5 down in the script
> > it looks like it doesn't like the "ADD CHANNEL" command. Am I counting
> > this correctly?
> >
> > 3) In QJackCtl I see the first 3 instruments going to playback_17/18
> > and the 4th instrument going to playback_19/20. Is it doing what I
> > need it to do?
> >
> >
> > [mark@Godzilla LinuxSampler]$ cat ./LS-Orchestra-script | nc localhost 8888
> > OK[0]
> > OK
> > OK[0]
> > OK
> > Err:0:Unknown command.
> > OK[0]
> 
> Ouch, would you please add the "SET ECHO 1" command to the beginning of your
> script. That will make the output much more readable! Because that way you
> can directly see which answer was followed by which command.
> 
> CU
> Christian
> 

Here's what I see on the first instrument. IT doesn't liek the way I'm
defining what I thought was the second half of the stereo connection:

[mark@Godzilla LinuxSampler]$ cat ./LS-Orchestra-script | nc localhost 8888
OK
CREATE AUDIO_OUTPUT_DEVICE JACK
OK[0]
SET AUDIO_OUTPUT_DEVICE_PARAMETER 0 CHANNELS=32
OK
CREATE MIDI_INPUT_DEVICE ALSA
OK[0]
SET MIDI_INPUT_PORT_PARAMETER 0 0 ALSA_SEQ_BINDINGS="64:0"
OK
 
ADD CHANNEL
OK[0]
LOAD ENGINE gig 0
OK
SET CHANNEL AUDIO_OUTPUT_DEVICE 0 0
OK
LOAD INSTRUMENT "/home/mark/Gigs/GSt30/Vienna Symphonic Library/16 Bit
looped In struments/01 VIOLINS_looped-16.gig" 0 0
OK
SET CHANNEL VOLUME 0 0.40
OK
SET CHANNEL AUDIO_OUTPUT_CHANNEL 0 0 0
OK
SET CHANNEL AUDIO_OUTPUT_CHANNEL 0 1 1
ERR:0:There is no audio output device with index 1
SET AUDIO_OUTPUT_CHANNEL_PARAMETER 0 0 JACK_BINDINGS='alsa_pcm:playback_17'
OK
SET AUDIO_OUTPUT_CHANNEL_PARAMETER 0 1 JACK_BINDINGS='alsa_pcm:playback_18'
OK
SET CHANNEL MIDI_INPUT 0 0 0 0
OK


What I thought I was saying was:

SET CHANNEL AUDIO_OUTPUT_CHANNEL 0 0 0
SET CHANNEL AUDIO_OUTPUT_CHANNEL 0 1 1

means
Engine 0 Channel 0 hooks to output 0
Engine 0 Channel 1 hooks to output 1

I thought Channel 0 and Channel 1 were the stereo pair from the gig
file and outputs 0 & 1 were the LS outputs but I think that this is
not what it means and I'm confused with this example.

thanks all!

Cheers,
Mark