Signalsmith-Audio/signalsmith-stretch
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Bugfix for very large buffers (e.g. whole audio file)

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Geraint 2022-11-29 21:44:13 +00:00
parent 088dad47f6
commit 85df203ba7
2 changed files with 2 additions and 2 deletions
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README.md
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@ -2,7 +2,7 @@
This is a C++11 library for pitch and time stretching, using the final approach from the ADC22 presentation _Four Ways To Write A Pitch-Shifter_.
It can handle a wide-range of pitch-shifts (multiple octaves) but time-stretching sounds best for more modest changes (between 0.5x and 2x).
It can handle a wide-range of pitch-shifts (multiple octaves) but time-stretching sounds best for more modest changes (between 0.75x and 1.5x). There are some audio examples on the [main project page](https://signalsmith-audio.co.uk/code/stretch/).
## How to use it

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signalsmith-stretch.h
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@ -126,7 +126,7 @@ struct SignalsmithStretch {
for (int outputIndex = 0; outputIndex < outputSamples; ++outputIndex) {
stft.ensureValid(outputIndex, [&](int outputOffset) {
// Time to process a spectrum! Where should it come from in the input?
int inputOffset = (outputOffset*inputSamples)/outputSamples - stft.windowSize();
int inputOffset = std::round(outputOffset*Sample(inputSamples)/outputSamples) - stft.windowSize();
int inputInterval = inputOffset - prevInputOffset;
prevInputOffset = inputOffset;