linuxaudio.org

On Fri, Jan 28, 2011 at 3:00 AM, Gabriel M. Beddingfield

 wrote:

quoted text
> Hi James,

>

> You always know how to nerd snipe me!

>

> On Thursday, January 27, 2011 06:35:08 pm James Stone wrote:

>> I have been working on the Neil tracker program recently,

>> and hit a weird bug that seems to affect only my

>> computer! I get a segfault when trying to use fft.h

>

> Not just you.  It segfaults for me, too.  Ubuntu 10.04 with Core Duo

> processor.

>

> With the patch below (to fft.h) I detect that p2r and p2i overrun the

> buffer when k==11, j==0, i==0.  However, k was supposed to STOP when

> it reached 11 = log(2048)/log(2).

>

> My guess is that is that the integer k is promoted to a float and the

> comparison is performed.  When I replace:

>

>   for (k = 0, le = 2; k < log(fftFrameSize)/log(2.); k++) {

>

> with:

>

>   long ITERS = log(fftFrameSize)/log(2.0) + 0.5;

>   for (k = 0, le = 2; k < ITERS; k++) {

>

> ...the code doesn't crash on me.  Here's a sample program that

> illustrates what's happening.

>

Wow! Gabriel, thanks for this! :) Excellent and very speedy work!!
James

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