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Documentation, minor optimization.

This commit is contained in:
Christian Speckner 2018-05-12 13:32:31 +02:00
parent 4c7ad7a0b6
commit 7391c55f9e
2 changed files with 6 additions and 3 deletions
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2
src/common/audio/ConvolutionBuffer.cxx
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@ -29,8 +29,8 @@ ConvolutionBuffer::ConvolutionBuffer(uInt32 size)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
void ConvolutionBuffer::shift(float nextValue)
{
myData[myFirstIndex] = nextValue;
myFirstIndex = (myFirstIndex + 1) % mySize;
myData[(myFirstIndex + mySize - 1) % mySize] = nextValue;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

7
src/common/audio/LanczosResampler.cxx
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@ -114,11 +114,14 @@ void LanczosResampler::precomputeKernels()
// Next step: time += 1 / formatTo.sampleRate
//
// By construction, we limit the argument during kernel evaluation to 0 .. 1, which
// corresponds to 0 .. 1 / formatFrom.sampleRate for the time
// corresponds to 0 .. 1 / formatFrom.sampleRate for time. To implement this, we decompose
// time as follows:
//
// time = N / formatFrom.sampleRate + delta
// timeIndex = N * formatTo.sampleRate + delta * formatTo.sampleRate * formatFrom.sampleRate
//
// with max integral N and delta, then time = delta -> modulus
// with N integral and delta < 0. From this, it follows that we replace
// time with delta, i.e. take the modulus of timeIndex.
timeIndex = (timeIndex + myFormatFrom.sampleRate) % myFormatTo.sampleRate;
}
}