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bug 1188704 limit number of Fourier coefficients used to halfSize earlier r=rillian

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realP[halfSize] was always set to zero because numberOfPartials < halfSize + 1
was always true.
This commit is contained in:
Karl Tomlinson 2015-07-30 10:08:15 +12:00
parent 08e91712bf
commit 57b96ec0de
1 changed files with 4 additions and 6 deletions
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10
dom/media/webaudio/blink/PeriodicWave.cpp
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@ -181,7 +181,9 @@ void PeriodicWave::createBandLimitedTables(const float* realData, const float* i
unsigned halfSize = fftSize / 2;
unsigned i;
numberOfComponents = std::min(numberOfComponents, halfSize + 1);
// Limit the number of components used to those for frequencies below the
// Nyquist of the fixed length inverse FFT.
numberOfComponents = std::min(numberOfComponents, halfSize);
m_bandLimitedTables.SetCapacity(m_numberOfRanges);
@ -218,16 +220,12 @@ void PeriodicWave::createBandLimitedTables(const float* realData, const float* i
realP[i] = 0;
imagP[i] = 0;
}
// Clear nyquist if necessary.
if (numberOfPartials < halfSize + 1)
realP[halfSize] = 0;
// Clear any DC-offset.
realP[0] = 0;
// Clear values which have no effect.
// Clear value which has no effect.
imagP[0] = 0;
imagP[halfSize] = 0;
// Create the band-limited table.
AlignedAudioFloatArray* table = new AlignedAudioFloatArray(m_periodicWaveSize);