mirror of
https://github.com/clementine-player/Clementine
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62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
/*
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* Chromaprint -- Audio fingerprinting toolkit
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* Copyright (C) 2011 Lukas Lalinsky <lalinsky@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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* USA
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*/
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#include "utils.h"
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#include "fft_lib_vdsp.h"
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using namespace std;
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using namespace Chromaprint;
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FFTLib::FFTLib(int frame_size, double *window)
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: m_window(window),
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m_frame_size(frame_size)
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{
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double log2n = log2(frame_size);
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assert(log2n == int(log2n));
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m_log2n = int(log2n);
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m_input = new float[frame_size];
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m_a.realp = new float[frame_size / 2];
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m_a.imagp = new float[frame_size / 2];
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m_setup = vDSP_create_fftsetup(m_log2n, 0);
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}
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FFTLib::~FFTLib()
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{
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vDSP_destroy_fftsetup(m_setup);
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delete[] m_a.realp;
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delete[] m_a.imagp;
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delete[] m_input;
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}
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void FFTLib::ComputeFrame(CombinedBuffer<short>::Iterator input, double *output)
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{
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ApplyWindow(input, m_window, m_input, m_frame_size, 1.0);
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// XXX we can avoid this ctoz call by changing ApplyWindow, is it worth it?
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vDSP_ctoz((DSPComplex *)m_input, 2, &m_a, 1, m_frame_size / 2);
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vDSP_fft_zrip(m_setup, &m_a, 1, m_log2n, FFT_FORWARD);
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output[0] = m_a.realp[0] * m_a.realp[0];
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output[m_frame_size / 2] = m_a.imagp[0] * m_a.imagp[0];
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output += 1;
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for (int i = 1; i < m_frame_size / 2; i++) {
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*output++ = m_a.realp[i] * m_a.realp[i] + m_a.imagp[i] * m_a.imagp[i];
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}
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}
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