time_stretch()

std::vector< double > MayaFlux::Kinesis::Discrete::time_stretch	(	std::span< const double >	data,
		double	stretch_factor
	)

Time-stretch via linear interpolation resampling Fast but alias-naive: no anti-aliasing pre-filter is applied when stretch_factor < 1.

Suitable for control signals and non-critical upsampling. For audio time-stretching use Discrete::phase_vocoder_stretch (PhaseVocoder.hpp).

Parameters

data	Source span
stretch_factor	>1 = longer/slower, <1 = shorter/faster; 1 returns copy

Returns

Resampled vector

Definition at line 220 of file Transform.cpp.

{
    if (data.empty() || stretch_factor <= 0.0)
        return {};
 
    if (stretch_factor == 1.0)
        return { data.begin(), data.end() };
 
    const auto out_size = static_cast<size_t>(
        static_cast<double>(data.size()) * stretch_factor);
 
    if (out_size == 0)
        return {};
 
    std::vector<double> out(out_size);
    interpolate_linear(data, out);
    return out;
}

References interpolate_linear().

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