Hello Everyone, Ross, Bjorn, Danny, Richard and Bogac, Thank you for your insightful feedback and advice with my project. I haven’t had time to look over all the material just yet, but i surely will over the next couple days. I’ve hit a bit wall with one specific part of the code, this mainly comes down to syntax I think and lack of experience with C. If anyone could tell me what i’m doing wrong in this instance, please let me know if i’m on the right track.
inside the memory allocations in the main function I’ve got this line: in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex)*N); This is my input array, i need to fill it with data from portaudio’s inputBuffer (I think). As far as I know the way to do this is to use the *userData Parameter of the callbaack which is type void*. So now I want to make ‘in’ the userData Parameter… i need to cast inside the callback from double to void*, and then to float to match the inputBuffer… I’ve done this with: int i; double *in; in = malloc(sizeof(double)); userData=(void*)in; userData=in; float *inp = (float*) inputBuffer, *fftbuffer = (float *) userData; for (i=0;i<framesPerBuffer;i++) *fftbuffer++ = *inp++; So my thought process now is that inputBuffer should be feeding the fftbuffer (which is the input array of the fft) with data… which means I can now execute my plan… Compiling fine! Unfortunately i’m crashing. I’m pretty sure it’s because i’m calling malloc in the callback. Which isn’t meant to be done (obviously). Question are: 1) Am I on the right track at all? 2) Is there a malloc free way to cast from double to void* ? 3) Am I right in thinking the ‘in’ is the FFT Buffer? Cheers, Connor. -- dupswapdrop -- the music-dsp mailing list and website: subscription info, FAQ, source code archive, list archive, book reviews, dsp links http://music.columbia.edu/cmc/music-dsp http://music.columbia.edu/mailman/listinfo/music-dsp
