Hi Connor. At first look when you do
in = malloc(sizeof(double)); you are allocating memory only for one double, so when you do fftbuffer++ it would access uninitialised memory. Cant you just use the inputBuffer data buffer as the fftbuffer instead of coying it ? If not you can just do the malloc outside the callback and reuse it. Hope that makes sense, good luck! Daniel 2015-06-18 18:15 GMT+01:00 Connor Gettel <connorget...@me.com>: > 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 -- 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
