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/*
cw_binaural~: a binaural synthesis external for pure data
by David Doukhan - david.doukhan@gmail.com - http://perso.limsi.fr/doukhan
and Anne Sedes - sedes.anne@gmail.com
Copyright (C) 2009-2011 David Doukhan and Anne Sedes
For more details, see CW_binaural~, a binaural synthesis external for Pure Data
David Doukhan and Anne Sedes, PDCON09
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "binaural_processor.hpp"
#include "riff.hpp"
#include "fft_riff.hpp"
#include "logstring.hpp"
#include "flyweight_ir_factory.hpp"
BinauralProcessor::~BinauralProcessor()
{
delete _leftdelay;
delete _rightdelay;
delete _leftriff;
delete _rightriff;
}
int BinauralProcessor::set_listen_db(string path)
{
string re("IRC_[0-9]+_C_R[0-9]+_T([-+]?[0-9]*\\.?[0-9]+)_P([-+]?[0-9]*\\.?[0-9]+)\\.wav");
return set_hrtf(path, re, true, true);
}
int BinauralProcessor::set_cipic_db(string path)
{
string re("subject_[0-9]+_azim_([-+]?[0-9]*\\.?[0-9]+)_elev_([-+]?[0-9]*\\.?[0-9]+)\\.wav");
return set_hrtf(path, re, true, false);
}
int BinauralProcessor::set_hrtf(string hrtf_path, string regex, bool azfirst, bool vertpolar)
{
ir_key k;
// slog << "Setting hrtf " << hrtf_path << endl;
k.path = hrtf_path;
k.length = _length;
k.iir_regex = regex;
k.is_azimuth_first = azfirst;
k.spectral = _spectral_processing;
k.minp_ap_dec = _minphase_allpass_decomposition;
k.vertical_polar_coords = vertpolar;
_newhrtfcont = FlyweightIrFactory::instance()->hrtf_set_get(k);
_itdcont = FlyweightIrFactory::instance()->itd_set_get(k);
// slog << "hrtfcont" << _newhrtfcont << endl;
// slog << "itdcont" << _itdcont << endl;
return 0;
}
void BinauralProcessor::process(float* input, float* azimuths, float* elevations, float* left_output, float* right_output, int n)
{
// FIXME: BUG IF LEFT OUTPUT = INPUT....
if (!_newhrtfcont)
{
// if no hrtf is selected, output a null signal
for (int i = 0; i < n; ++i)
left_output[i] = right_output[i] = 0;
return;
}
// for a given block, consider only the last requested azimuth and elevation
float az = azimuths[n-1];
float el = elevations[n-1];
// update ic to store identifiers of impulse responses to be interpolated
interp_cdts ic;
_newhrtfcont->set_candidates(ic, az, el);
_newhrtfcont->update_from_candidates(ic, _leftriff->coeff_get(), _rightriff->coeff_get());
// Apply Fractional Delay
if (_itdcont)
{
float itd = _itdcont->itd_from_candidates(ic);
_leftdelay->process(input, left_output, itd < 0 ? -itd: 0, n);
_rightdelay->process(input, right_output, itd > 0 ? itd : 0, n);
}
else
for (int i = 0; i < n; ++i)
left_output[i] = right_output[i] = input[i];
// Filter the signal
_leftriff->process(left_output, left_output, n);
_rightriff->process(right_output, right_output, n);
}
BinauralProcessor::BinauralProcessor(int impulse_response_size, string& filtering_method, string& delay_method): _newhrtfcont(NULL), _itdcont(NULL)
{
//slog << "New binaural processor using IR size " << impulse_response_size << ", filter method " << filtering_method << ", delay method " << delay_method << endl;
// check if the requested filtering method is supported
if (!filtering_method.compare("RIFF"))
_spectral_processing = false;
else if (!filtering_method.compare("FFT"))
_spectral_processing = true;
else
{
slog << filtering_method << "is not a valid filtering method name: try \"FFT\" or \"RIFF\"" << endl;
throw 0;
}
// check if the requested impulse response size is supported
// FIXME: check if it is a correct test!! => PUT THAT IN THE FLYWEIGHT
_length = impulse_response_size;
while (impulse_response_size > 2)
impulse_response_size /= 2;
if (impulse_response_size != 2)
{
slog << "Impulse response size should be a positive power of 2: recommended values are 128, 256 or 512" << endl;
throw 0;
}
// *********************
// TODO
// at init, use only a dirac impulsion??
if (_spectral_processing)
{
_leftriff = new FftRiff(_length);
_rightriff = new FftRiff(_length);
}
else
{
_leftriff = new Riff(_length);
_rightriff = new Riff(_length);
}
// delays
_leftdelay = Delay::create(delay_method, _length);
_rightdelay = Delay::create(delay_method, _length);
_minphase_allpass_decomposition = delay_method.compare("nodelay");
}
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