ITACTCUtils.cpp

#include <ITACTCUtils.h>
#include <ITAHDFTSpectra.h>

#include <ITAAudiofileWriter.h>
#include <ITAFFT.h>
#include <ITAFilesystemUtils.h>
#include <ITAHDFTSpectrum.h>
#include <ITASampleFrame.h>

// Helper
void Export( const ITAHDFTSpectrum* pSpectrum, const std::string& sFilePath )
{

	ITASampleBuffer sbImpulseResponse( pSpectrum->getDFTSize()-1, true );
	ITASampleBuffer sbSpectrum( pSpectrum->getDFTSize(), true ); // local copy

	ITAFFT ifft( ITAFFT::IFFT_C2R, sbImpulseResponse.length(), sbSpectrum.GetData(), sbImpulseResponse.GetData() );

	// Make local copy of input (will be destroyed by in-place FFT)
	sbSpectrum.write( pSpectrum->data(), sbSpectrum.length() );
	float* fIn = sbSpectrum.GetData();
	float* fOut = sbImpulseResponse.GetData();
	ifft.execute( fIn, fOut );

	// Normalize after IFFT
	sbImpulseResponse.div_scalar( float( sbImpulseResponse.length() ) );

	std::string sFilePathComplete = sFilePath;
	if( getFilenameSuffix( sFilePath ).empty() )
		sFilePathComplete += ".wav";

	//writeAudiofile( correctPath( sFilePathComplete ), &sbImpulseResponse, pSpectrum->getSamplerate(), ITA_FLOAT );

	return;
}