mirror of
https://github.com/clementine-player/Clementine
synced 2024-12-20 22:34:37 +01:00
59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
/*
|
|
* Chromaprint -- Audio fingerprinting toolkit
|
|
* Copyright (C) 2010 Lukas Lalinsky <lalinsky@gmail.com>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
|
|
* USA
|
|
*/
|
|
|
|
#include "utils.h"
|
|
#include "fft_lib_fftw3.h"
|
|
|
|
using namespace std;
|
|
using namespace Chromaprint;
|
|
|
|
FFTLib::FFTLib(int frame_size, double *window)
|
|
: m_window(window),
|
|
m_frame_size(frame_size)
|
|
{
|
|
m_input = (double *)fftw_malloc(sizeof(double) * frame_size);
|
|
m_output = (double *)fftw_malloc(sizeof(double) * frame_size);
|
|
m_plan = fftw_plan_r2r_1d(frame_size, m_input, m_output, FFTW_R2HC, FFTW_ESTIMATE);
|
|
}
|
|
|
|
FFTLib::~FFTLib()
|
|
{
|
|
fftw_destroy_plan(m_plan);
|
|
fftw_free(m_input);
|
|
fftw_free(m_output);
|
|
}
|
|
|
|
void FFTLib::ComputeFrame(CombinedBuffer<short>::Iterator input, double *output)
|
|
{
|
|
ApplyWindow(input, m_window, m_input, m_frame_size, 1.0);
|
|
fftw_execute(m_plan);
|
|
double *in_ptr = m_output;
|
|
double *rev_in_ptr = m_output + m_frame_size - 1;
|
|
output[0] = in_ptr[0] * in_ptr[0];
|
|
output[m_frame_size / 2] = in_ptr[m_frame_size / 2] * in_ptr[m_frame_size / 2];
|
|
in_ptr += 1;
|
|
output += 1;
|
|
for (int i = 1; i < m_frame_size / 2; i++) {
|
|
*output++ = in_ptr[0] * in_ptr[0] + rev_in_ptr[0] * rev_in_ptr[0];
|
|
in_ptr++;
|
|
rev_in_ptr--;
|
|
}
|
|
}
|