[Sc-devel] SendFloatArray from Server to Lang

[Click Nilson]

Hi Dan,

> Have you planned the format of the OSC messages? Just like SendTrig's
> messages but of variable length? i.e. sending [9.9, 6.2, 3.3] comes
> across like [ /tr, nodeid, someinteger, 9.9, 6.2, 3.3 ]?
>

Variable length float array, yes.

[\floatarray, nodeid, floatarrayid, integerarraysize, float, float,  
float...]

implemented by  generalising TriggerMsg::Perform in SC_World.cpp

best
Nick

PS I prefer audio features

> Dan
>
>
> P.S. The gmail thing is a *feature* ;)
>
>
> 2007/11/4, Click Nilson <clicksonnil at gmail.com>:
>> Dear all,
>>
>> I'm not suggesting the below for any 3.1.1 this week, but I am
>> starting discussion re: 3.2. This is something that has come up in
>> exploring potential machine listening capabilities.
>>
>> I've been looking into how difficult it is to add the capability to
>> the server to send back an array of floats. This would be really
>> useful for UGens that extract features which can then play a role in
>> compositional decisions language side; ie, find the top N peaks in
>> the spectrum, find N timbral features, polyphonic pitch detection,
>> extract first N MFCCs etc. I'd really like to be able to send an
>> arbitrary number of floats (well, up to packet size allowance) from a
>> plugin as an OSC message.
>>
>> I draft a solution below; I think I know how to implement this. The
>> possible gotcha is that dynamically loaded plugins can't pass an
>> array of floats via a pointer to the server, because the address
>> space is not shared. But I'm hoping that's not actually an issue?
>>
>> Any comments? Can I go ahead once 3.1.1 is settled?
>>
>> Nick
>>
>>
>> Draft of additions required:
>>
>> SC_Node.cpp
>> void Node_SendFloatArray(Node* inNode, int arrayID, int size, float*
>> values)
>>
>> SC_World.cpp
>> void FloatArrayMsg::Perform()
>>
>> ft->fSendFloatArray = &Node_SendFloatArray;
>>
>> SC_Prototypes.h
>> void Node_SendFloatArray(Node* inNode, int arrayID,  int size, float*
>> values);
>>
>> SC_HiddenWorld.h
>> struct FloatArrayMsg {
>>         World *mWorld;
>>         int32 mNodeID;
>>         int32 mArrayID;
>>         float* mValues;
>>         int32 size;
>>
>>         void Perform();
>> };
>>
>> typedef MsgFifoNoFree<FloatArrayMsg, 1024> FloatArrayFifo;
>>
>> And an addition of one more step to:
>> SC_CoreAudio.cpp
>> SC_AudioDriver::RunThread()
>> Shouldn't impact performance in any substantial way.
>>
>>
>>
>>
>> _______________________________________________
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>> Sc-devel at create.ucsb.edu
>> http://www.create.ucsb.edu/mailman/listinfo/sc-devel
>>
>
>
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