Normally it is not an issue to know how many sound sources are active simultaneously. They are mixed to a given number of output channels. 

I have the opportunity to do some tests in a WFS lab. In contrast to what we are normally used to, the WFS requires one output channel per sound source (active at a given moment). Since in my project the number of sound sources is chosen randomly, i.e. not known beforehand and moreover several instances of the same instrument may be active simultaneously at different positions in space, I need to assign output channel numbers dynamically when initiating an instance of an instrument. This means I need to know how many channels are use at a given time. Is there an official opcode to get this information?

Currently I'm using this trick: I include an ftgentmp statement in each instrument outputting sound. From the table number I get during the i-pass I can deduce the number of active sound sources (by subtracting the number of  static f-tables generated in the general initialisation pass)  as long as not more than one ftgentmp is needed per instrument. This is a workaround. Is there a better way?

cheers,

Karin

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opcode active ?http://www.csounds.com/manual/html/active.html
greetings,
tarmo

On Tuesday 26 April 2016 08:55:20 you wrote:
> Normally it is not an issue to know how many sound sources are active
> simultaneously. They are mixed to a given number of output channels.
> 
> I have the opportunity to do some tests in a WFS lab. In contrast to what we
> are normally used to, the WFS requires one output channel per sound source
> (active at a given moment). Since in my project the number of sound sources
> is chosen randomly, i.e. not known beforehand and moreover several
> instances of the same instrument may be active simultaneously at different
> positions in space, I need to assign output channel numbers dynamically
> when initiating an instance of an instrument. This means I need to know how
> many channels are use at a given time. Is there an official opcode to get
> this information?
> 
> Currently I'm using this trick: I include an ftgentmp statement in each
> instrument outputting sound. From the table number I get during the i-pass
> I can deduce the number of active sound sources (by subtracting the number
> of  static f-tables generated in the general initialisation pass)  as long
> as not more than one ftgentmp is needed per instrument. This is a
> workaround. Is there a better way?
> 
> cheers,
> 
> Karin
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>         https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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thanks, this seems to be a better and well defined way for my problem

> On 26 Apr 2016, at 10:12, Tarmo Johannes  wrote:
> 
> opcode active ?http://www.csounds.com/manual/html/active.html
> greetings,
> tarmo
> 
> On Tuesday 26 April 2016 08:55:20 you wrote:
>> Normally it is not an issue to know how many sound sources are active
>> simultaneously. They are mixed to a given number of output channels.
>> 
>> I have the opportunity to do some tests in a WFS lab. In contrast to what we
>> are normally used to, the WFS requires one output channel per sound source
>> (active at a given moment). Since in my project the number of sound sources
>> is chosen randomly, i.e. not known beforehand and moreover several
>> instances of the same instrument may be active simultaneously at different
>> positions in space, I need to assign output channel numbers dynamically
>> when initiating an instance of an instrument. This means I need to know how
>> many channels are use at a given time. Is there an official opcode to get
>> this information?
>> 
>> Currently I'm using this trick: I include an ftgentmp statement in each
>> instrument outputting sound. From the table number I get during the i-pass
>> I can deduce the number of active sound sources (by subtracting the number
>> of  static f-tables generated in the general initialisation pass)  as long
>> as not more than one ftgentmp is needed per instrument. This is a
>> workaround. Is there a better way?
>> 
>> cheers,
>> 
>> Karin
>> 
>> Csound mailing list
>> Csound@listserv.heanet.ie
>> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
>> Send bugs reports to
>>        https://github.com/csound/csound/issues
>> Discussions of bugs and features can be posted here
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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