Re: [Audacity-devel] Buffer overrun in ChangePitch?

[Vaughan J. <vjo...@co...>]

Vaughan Johnson wrote:

> Tino Meinen wrote:
>
>> Op ma 26-05-2003, om 09:55 schreef Dominic Mazzoni:
>>  
>>
>>> Matt Brubeck wrote:
>>>   
>>>
>>>> Current CVS segfaults reliably on PowerPC with the following steps:
>>>>
>>>> 1. Start Audacity.
>>>> 2. Generate Silence.
>>>> 3. Select the entire 30-sec silent track.
>>>> 4. Choose the "Change Pitch..." effect.
>>>>     
>>>
>>
>> I get a consistent segfault on my i386 box when I change the pitch by
>> *more* than 65.9 % (using the slider).
>> Below that, everything's OK.
>>
> Confirmed, although the cutoff for me is a little lower. 61.0% works, 
> but 64.0% doesn't. Didn't zero in any more than that.
>
> The access violation consistently happens for me way down in the 
> SoundTouch code, at line 138 (dest[i] = temp / SCALE;) in 
> RateTransposer.cc, in method RateTransposer::transposeMono. This is 
> after the first chunk of progress indicator is done (long after 
> DeduceFrequencies). Dominic, can you spare time to figure this one out 
> or should I try? I'm guessing the i index for dest[i] is out of 
> bounds, but I haven't stepped through to see why. 

PS. This is only for silence. Change Pitch by 87% (for example) works 
fine for actual non-zero audio.

-Vaughan