[linux-audio-dev] Blockless processing

I couldn't resist it so I hacked up a quick script to try the blockless, dynamicly compiled processing we were discussing the other day. http://plugin.org.uk/blockless/ just "make" if you want to test it Its really hacky insomnia perl code, so dont look at it ;) It works by defining graphs (.g), that are made up of atoms (C code) and other graphs. The perl script turns it all into one giant lump of C and builds it. Graph files look like eg (pinknoise.g): noise n(); // declares an instance n zm1 d(); mix2to1 m(); gain half(0.5f); n:out -> m:in1; // connect the 'out' port of n to the 'in' port of m n:out -> d:in; d:out -> m:in2; m:out -> half:in; half:out -> this:out; // an output from this module to the parent graph I went as far as defining a biquad filter in the graph format (http://plugin.org.uk/blockless/blockless/modules/biquad.g), but it dosen't quite work because the execution order is more or less random. I used the biquad in a simple toplevel graph (http://plugin.org.uk/blockless/blockless/graphs/test4.g), it takes about 50 cycles per sample on PIII (interestingly its compiles to slightly worse code in gcc3.2), the source my script produces is very tangled and funtion-y, but gcc manages to untagle it and inline it all, eg. http://plugin.org.uk/blockless/blockless/intem/test4.c Its too much work to create a reasonably complex synth or anything in this as theres no UI and keeping all the links straight in your head is painful, so I dont know how well it scales up. Its quite cool building up modules from gain and z^-1 units though :) - Steve