| 5 | #include "Resampler.h" |
| 6 | |
| 7 | void Resampler::prepareToPlay(double inSourceSampleRate, int inMaxBlockSize, double inTargetSampleRate) |
| 8 | { |
| 9 | mSourceSampleRate = inSourceSampleRate; |
| 10 | mTargetSampleRate = inTargetSampleRate; |
| 11 | mSpeedRatio = mSourceSampleRate / mTargetSampleRate; |
| 12 | |
| 13 | mInternalBuffer.setSize(1, inMaxBlockSize + 2 * static_cast<int>(LagrangeInterpolator::getBaseLatency()) + 1); |
| 14 | |
| 15 | // Lowpass filter stuffs |
| 16 | if (mTargetSampleRate < mSourceSampleRate) { |
| 17 | auto filter_coeffs = juce::dsp::FilterDesign<float>::designIIRLowpassHighOrderButterworthMethod( |
| 18 | static_cast<float>(mTargetSampleRate / 2.0), mSourceSampleRate, 4); |
| 19 | |
| 20 | mLowpassFilters.resize(static_cast<size_t>(filter_coeffs.size())); |
| 21 | |
| 22 | for (size_t i = 0; i < mLowpassFilters.size(); i++) { |
| 23 | mLowpassFilters[i].coefficients = filter_coeffs[(int) i]; |
| 24 | } |
| 25 | } else { |
| 26 | // Remove elements from vector (set size to 0) |
| 27 | mLowpassFilters.clear(); |
| 28 | } |
| 29 | |
| 30 | reset(); |
| 31 | } |
| 32 | |
| 33 | void Resampler::reset() |
| 34 | { |