70 lines
1.8 KiB
C++
70 lines
1.8 KiB
C++
/*
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* Chromaprint -- Audio fingerprinting toolkit
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* Copyright (C) 2010 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 <limits>
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#include <assert.h>
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#include <math.h>
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#include "chroma_filter.h"
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#include "utils.h"
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using namespace std;
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using namespace Chromaprint;
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ChromaFilter::ChromaFilter(const double *coefficients, int length, FeatureVectorConsumer *consumer)
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: m_coefficients(coefficients),
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m_length(length),
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m_buffer(8),
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m_result(12),
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m_buffer_offset(0),
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m_buffer_size(1),
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m_consumer(consumer)
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{
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}
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ChromaFilter::~ChromaFilter()
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{
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}
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void ChromaFilter::Reset()
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{
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m_buffer_size = 1;
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m_buffer_offset = 0;
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}
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void ChromaFilter::Consume(std::vector<double> &features)
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{
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m_buffer[m_buffer_offset] = features;
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m_buffer_offset = (m_buffer_offset + 1) % 8;
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if (m_buffer_size >= m_length) {
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int offset = (m_buffer_offset + 8 - m_length) % 8;
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fill(m_result.begin(), m_result.end(), 0.0);
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for (int i = 0; i < 12; i++) {
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for (int j = 0; j < m_length; j++) {
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m_result[i] += m_buffer[(offset + j) % 8][i] * m_coefficients[j];
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}
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}
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m_consumer->Consume(m_result);
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}
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else {
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m_buffer_size++;
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}
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}
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