Error: Error: Variable does not contain a valid scalar value

[steffendasenbrock]

Hi,

my aim is to use an AC variable I created using my own plugin as an input of another plugin, e.g. the gain plugin. I have two question:

1. I want to set the value of the gain.gains variable to the value of my AC variable, gains needs to be of kind vector<float>, but I can not find an function which inserts an AC variable as a vector. But the only functions I can find are insert_var, insert_var_int, insert_var_float and insert_var_double - what would be the correct way to register a variable such that it can be used as gains for the gain plugin?

2. I tried to set the value of gain.max, since it is a float value. For this I used something like this:

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    ac.insert_var_float(ac.handle, "db_EEG_steered_AC", &db_EEG_steered );

with db_EEG_steered being are float variable. But when setting

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mha.gain.max = db_EEG_steered_AC

I get the error:

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Error: (mha_parser) (mha_parser) "db_EEG_steered_AC" does not contain a valid scalar value (db_EEG_steered_AC)
(while parsing "config.cfg" line 13)

What could be wrong in this case?

[tobiasherzke]

AC variables can only be read by MHA plugins while they execute either their prepare() or process() callback. You cannot read them in the MHA configuration language.

[steffendasenbrock]

Thanks for your answer. I though it would be possible to pass content of AC variables between plugins using the configuration language. Is there a way to pass an AC variable created by my own plugin to e.g. the gain plugin?

[tobiasherzke]

Yes: you can change the source code of the gain plugin to make use of an AC variable and recompile the gain plugin.

It's open source after all.