MIR::anonymous_namespace{StftFrameProvider.cpp} Namespace Reference

Functions
int	GetFrameSize (int sampleRate)
double	GetHopSize (int sampleRate, long long numSamples)

Variables
constexpr auto	twoPi = 2 * 3.14159265358979323846

Function Documentation

GetFrameSize()

int MIR::anonymous_namespace{StftFrameProvider.cpp}::GetFrameSize

(

int

sampleRate

)

Definition at line 26 of file StftFrameProvider.cpp.

{
   // 2048 frame size for sample rate 44.1kHz
   return 1 << (11 + (int)std::round(std::log2(sampleRate / 44100.)));
}

References fast_float::round(), and anonymous_namespace{ClipSegmentTest.cpp}::sampleRate.

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GetHopSize()

double MIR::anonymous_namespace{StftFrameProvider.cpp}::GetHopSize	(	int	sampleRate,
		long long	numSamples
	)

Definition at line 32 of file StftFrameProvider.cpp.

{
   // Aim for a hop size closest to 10ms, yet dividing `numSamples` to a power
   // of two. This will spare us the need for resampling when we need to get the
   // autocorrelation of the ODF using an FFT.
   const auto idealHopSize = 0.01 * sampleRate;
   const int exponent = std::round(std::log2(numSamples / idealHopSize));
   if (exponent < 0)
      return 0;
   const auto numFrames = 1 << exponent;
   return 1. * numSamples / numFrames;
}

References fast_float::round(), and anonymous_namespace{ClipSegmentTest.cpp}::sampleRate.

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Variable Documentation

twoPi

constexpr auto MIR::anonymous_namespace{StftFrameProvider.cpp}::twoPi = 2 * 3.14159265358979323846

constexpr

Definition at line 24 of file StftFrameProvider.cpp.