Re: [ecasound] understanding loop device use

Hi,

I understood Loop with this ecasound rule :

"A chain setup must have one input and one output".

so on
-a:1 one input "bla bla bla" one output
-a: 2 one _input ""bla bla bla" one output.

Writing :
-a 1,2 mix or split the lines.

Now loop is a sort of pipe :

-a:1 one_input "bla bla bla" "a output loop pipe"
-a:2,3,4 "the input loop pipe"
-a:2 some plugin
-a:3 other plugin
-a:2 other plugin
-a:2,3,4 one output

a:1 -> output Pipe -> a:2,3,4 input pipe -> a:2 -> something -> -a:2,3,4 -> Output
                                                          -> a:3 -> other ->
                                                          -> a:4 -> Other ->

A true exemple from true life a multiband limitter for FM transmitter a dirty sound :
-z:mixmode,sum -f:24,2,96000
-a:CSA -f:24,2,96000 -i alsahw,0,0 -el:fastLookaheadLimiter,0,-2,0.030 -el:fastLookaheadLimiter,0,-4,0.523 -el:fastLookaheadLimiter,6,-0.1,2 -o:loop,1

-a:LOW,MED,HIG -i:loop,1

-a:LOW -el:bandpass_iir,1500,3000,2 -el:fastLookaheadLimiter,0,-0.5,0.060
-a:MED -el:bandpass_iir,7500,7000,2 -el:fastLookaheadLimiter,0,-5,0.050
-a:HIG -el:bandpass_iir,14000,6000,2 -el:fastLookaheadLimiter,0,-20,0.030

-a:LOW,MED,HIG -f:16,2,96000 -o stdout

Best regards,
Remi+

> Message du 21/07/08 12:41
> De : "Dubphil"
> A : ecasound-list@email-addr-hidden
> Copie à :
> Objet : [ecasound] understanding loop device use
>
>
> Hello,
>
> I definitevely not understood how to use the loop devices, here is what
> I want :
>
> # ecasound chainsetup file
>
> # general
> -b:128 -r:-1 -z:intbuf -z:db,100000 -n:"test" -X -z:noxruns -z:nopsr
> -z:mixmode,avg
>
> # audio inputs
> -a:1 -f:f32_le,2,48000 -i:jack
> -a:2 -f:f32_le,2,48000 -i:jack
> -a:3 -f:f32_le,2,48000 -i:"loop,1",1
> -a:4 -f:f32_le,2,48000 -i:"loop,2",2
> -a:5 -f:f32_le,2,48000 -i:"loop,1",1
> -a:6 -f:f32_le,2,48000 -i:"loop,2",2
>
> # audio outputs
> -a:1 -f:f32_le,2,48000 -o:"loop,1",1
> -a:2 -f:f32_le,2,48000 -o:"loop,2",2
> -a:3,4,5,6 -f:f32_le,2,48000 -o:jack
>
> and here is what ecasound tells :
>
> dubphil@email-addr-hidden ~ $ ecasound -c -s test.ecs
> ********************************************************************************
> * ecasound v2.4.7pre4_2.5.0 (C) 1997-2008 Kai Vehmanen and others
> ********************************************************************************
> - [ Chainsetup created (file) ]
> ------------------------------------------------
> (eca-chainsetup-parser) Setting buffersize to (samples) 128.
> (eca-chainsetup-parser) Raised-priority mode disabled.
> (eca-chainsetup-parser) Enabling extra buffering on realtime devices.
> (eca-chainsetup-parser) Using double-buffer of 100000 sample frames.
> (eca-chainsetup-parser) Setting chainsetup name to "test".
> (eca-chainsetup-parser) Updating outputs (rw-mode).
> (eca-chainsetup-parser) Ignoring xruns during processing.
> (eca-chainsetup-parser) Disabling precise-sample-rates with OSS audio
> ... devices.
> (eca-chainsetup-parser) Enabling 'avg' mixmode.
> (eca-chainsetup) Unable to connect: Chain "3" is not valid. Following
> errors were
> ... detected:
> (eca-chainsetup) Chain "3" is not connected to any input. All chains
> must have
> ... exactly one valid input. (2.1-NO-CHAIN-INPUT)
> (eca-chainsetup) Unable to connect: Chain "4" is not valid. Following
> errors were
> ... detected:
> (eca-chainsetup) Chain "4" is not connected to any input. All chains
> must have
> ... exactly one valid input. (2.1-NO-CHAIN-INPUT)
> (eca-chainsetup) WARNING: Input "loop,1" is not connected to any chain.
> ... (3.1-DISCON-INPUT)
> (eca-chainsetup) WARNING: Input "loop,2" is not connected to any chain.
> ... (3.1-DISCON-INPUT)
> (eca-session) Chainsetup loaded from 'test.ecs' is not valid!
> - [ Session created ]
> ----------------------------------------------------------
> ---
> ecasound: ERROR: [ECA-SESSION] : "Errors parsing session-level options.
> Unable to create session."
>
> I believed I could give a chain an output loop device and use this loop
> as input for several other chains...
> am I wrong ?
>
> Regards
>
> Philippe
>
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Received on Mon Jul 21 20:15:02 2008