Run-time compile with llvm

[selimbousbih]

How to enable run time compiling in a smart keyboard project ? I couldn't access the llvm_dsp_factory from the dspfaust c++ since it is inside a if bloc. I am not familiar with the c++ environment, I tried setting dynamicdsp to true in the cmake options but it didn't work.

[sletz]

1) you can't use run time compiling on iOS, 2) we never tried yet on Android.

[selimbousbih]

Thank you for your response. Is there another way to change the process signal at run time ? At first I assumed that apps like moforte's PowerStomp or Geoshred use run time compiling because they let you change their effect chains by adding and deleting effects

[sletz]

PowerStomp or Geoshred applications have separated Faust compiled DSPs (as C++ classes) that are dynamically combined in a chain using C++.

[josmithiii]

Yes, GeoShred effects are separate .h files compiled from separate Faust .dsp files. We have not needed to use dynamic linking yet, because the memory footprints are so small (go models!). :-)

Each #included .h file defines a class that can be instanced any number of times in the usual way (new, buildUserInterface, init, etc.). Then the "effects chain" is simply an array of dsp* pointers.

• Julius

On Sun, Nov 18, 2018 at 12:11 AM Stéphane Letz notifications@github.com wrote:

PowerStomp or Geoshred applications have separated compiled DSPs that are dynamically compiled in a chain using C++.

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/grame-cncm/faust/issues/239#issuecomment-439654444, or mute the thread https://github.com/notifications/unsubscribe-auth/ACGVFf8rnRGP9hj3Bvx5u5NVCGxNnWMKks5uwJeGgaJpZM4YdfI3 .

--

Julius O. Smith III jos@ccrma.stanford.edu Professor of Music and, by courtesy, Electrical Engineering CCRMA, Stanford University http://ccrma.stanford.edu/~jos/ http://ccrma.stanford.edu/

[selimbousbih]

Thank you, I will try that

[selimbousbih]

I was able to make the effects chain using an array of dsp* and linking them with dsp_sequence. I'm trying to add amp feedback to a guitar model. For the feedback, the guitar and the amp should be on the same dsp, however, the effects should be placed in the middle right ? Is there a way to dynamically change the effects chain in between ? Thanks again.

[josmithiii]

If I had a guitar on one dsp and its effects on another, I would implement amp feedback using an audio path back to the first dsp. Fortunately in this case, propagation through air is slow, so buffer latency is not an issue. :-)

On Mon, Dec 31, 2018 at 3:10 AM Selim Bousbih notifications@github.com wrote:

I was able to make the effects chain using an array of dsp* and linking them with dsp_sequence. I'm trying to add amp feedback to a guitar model. For the feedback, the guitar and the amp should be on the same dsp, however, the effects should be placed in the middle right ? Is there a way to dynamically change the effects chain in between ? Thanks again.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/grame-cncm/faust/issues/239#issuecomment-450633827, or mute the thread https://github.com/notifications/unsubscribe-auth/ACGVFd0ZIE2phBNHHA3Q0Pk9QFmWAI7vks5u-fCsgaJpZM4YdfI3 .

--

Julius O. Smith III jos@ccrma.stanford.edu Professor of Music and, by courtesy, Electrical Engineering CCRMA, Stanford University http://ccrma.stanford.edu/~jos/ http://ccrma.stanford.edu/

[selimbousbih]

I understand that the solution should be done in the c++ level. Please let me know if there is a way to do it using faust.

Thank you for your help. May you have a healthy and prosperous new year!