[webkit-dev] FFT normalization in RealtimeAnalyser

[Dean Jackson]

Fixed in r172816.

Dean

> On 15 Aug 2014, at 1:56 am, Info <info at wothke.ch> wrote:
> 
> This seems to be a bug... that has been fixed in Chromium: see chromium\src\third_party\WebKit\Source\modules\webaudio
> 
> 
> Zitat von Info <info at wothke.ch>:
> 
>> In order to understand the idiotic differences between the data ranges of the AnalyzerNode's getFloatFrequencyData() and getByteFrequencyData() APIs I finally found myself analyzing the WebKit sources: https://github.com/WebKit/webkit/blob/master/Source/WebCore/Modules/webaudio/RealtimeAnalyser.cpp
>> 
>> What surprises me there is the:
>>    const double magnitudeScale = 1.0 / DefaultFFTSize;
>> which is used to normalize the FFT results (see RealtimeAnalyser::doFFTAnalysis()).
>> 
>> Should the correct scaling factor not rather be: 2/actualFftSize?
>> 
>> 
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