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/*
FFTease - A set of Live Spectral Processors
Originally written by Eric Lyon and Christopher Penrose for the Max/MSP platform
Copyright (c)Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
#include "main.h"
fftease::fftease(I mult,BL stereo,BL window,BL bitshuf):
_mult(mult),_stereo(stereo),_window(window),_bitshuf(bitshuf),
_inCount(0),
blsz(0),smprt(0)
{}
fftease::~fftease() {}
BL fftease::Init()
{
BL ret = flext_dsp::Init();
Clear();
return ret;
}
V fftease::Exit()
{
Delete();
}
V fftease::m_dsp(I n,S *const *in,S *const *out)
{
const I _D = n;
const F sr = Samplerate();
if(_D != blsz || sr != smprt) {
blsz = _D;
smprt = sr;
Delete();
Set();
}
}
V fftease::m_signal(I n,S *const *in,S *const *out)
{
/* declare working variables */
I i;
const I _D = n,_N = _D*Mult(),_Nw = _N,_N2 = _N/2,_Nw2 = _Nw/2;
/* fill our retaining buffers */
_inCount += _D;
if(_stereo) {
for(i = 0; i < _N-_D ; i++ ) {
_input1[i] = _input1[i+_D];
_input2[i] = _input2[i+_D];
}
for(I j = 0; i < _N; i++,j++) {
_input1[i] = in[0][j];
_input2[i] = in[1][j];
}
}
else {
for (i = 0 ; i < _N-_D ; i++ )
_input1[i] = _input1[i+_D];
for (I j = 0; i < _N; i++,j++ )
_input1[i] = in[0][j];
}
/* apply hamming window and fold our window buffer into the fft buffer */
fold( _input1, _Wanal, _Nw, _buffer1, _N, _inCount );
if(_stereo) fold( _input2, _Wanal, _Nw, _buffer2, _N, _inCount );
/* do an fft */
if(_bitshuf) {
rdft( _N, 1, _buffer1, _bitshuffle, _trigland );
if(_stereo) rdft( _N, 1, _buffer2, _bitshuffle, _trigland );
}
else {
rfft( _buffer1, _N2, 1);
if(_stereo) rfft( _buffer2, _N2,1);
}
// ---- BEGIN --------------------------------
Transform(_N2,in+(_stereo?1:2));
// ---- END --------------------------------
/* do an inverse fft */
if(_bitshuf)
rdft( _N, -1, _buffer1, _bitshuffle, _trigland );
else
rfft( _buffer1, _N2, 0);
/* dewindow our result */
overlapadd( _buffer1, _N, _Wsyn, _output, _Nw, _inCount);
/* set our output and adjust our retaining output buffer */
const F mult = 1./_N;
for ( i = 0; i < _D; i++ )
out[0][i] = _output[i] * mult;
for ( i = 0; i < _N-_D; i++ )
_output[i] = _output[i+_D];
for (; i < _N; i++ )
_output[i] = 0.;
}
void fftease::Set()
{
/* preset the objects data */
const I _D = Blocksize(),_N = _D*Mult(),_Nw = _N,_N2 = _N/2,_Nw2 = _Nw/2;
_inCount = -_Nw;
/* assign memory to the buffers */
_input1 = new F[_Nw];
_buffer1 = new F[_N];
_channel1 = new F[_N+2];
if(_stereo) {
_input2 = new F[_Nw];
_buffer2 = new F[_N];
_channel2 = new F[_N+2];
}
_output = new F[_Nw];
if(_bitshuf) {
_bitshuffle = new I[_N*2];
_trigland = new F[_N*2];
init_rdft( _N, _bitshuffle, _trigland);
}
_Hwin = new F[_Nw];
_Wanal = new F[_Nw];
_Wsyn = new F[_Nw];
if(_window)
makewindows( _Hwin, _Wanal, _Wsyn, _Nw, _N, _D, 0);
else
makehanning( _Hwin, _Wanal, _Wsyn, _Nw, _N, _D, 0,0);
}
void fftease::Clear()
{
_bitshuffle = NULL;
_trigland = NULL;
_input1 = _input2 = NULL;
_Hwin = NULL;
_Wanal = _Wsyn = NULL;
_buffer1 = _buffer2 = NULL;
_channel1 = _channel2 = NULL;
_output = NULL;
}
void fftease::Delete()
{
if(_input1) delete[] _input1;
if(_buffer1) delete[] _buffer1;
if(_channel1) delete[] _channel1;
if(_stereo) {
if(_input2) delete[] _input2;
if(_buffer2) delete[] _buffer2;
if(_channel2) delete[] _channel2;
}
if(_output) delete[] _output;
if(_bitshuf) {
if(_bitshuffle) delete[] _bitshuffle;
if(_trigland) delete[] _trigland;
}
if(_Hwin) delete[] _Hwin;
if(_Wanal) delete[] _Wanal;
if(_Wsyn) delete[] _Wsyn;
}
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