svcore
1.9
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00001 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ 00002 00003 /* 00004 Sonic Visualiser 00005 An audio file viewer and annotation editor. 00006 Centre for Digital Music, Queen Mary, University of London. 00007 This file copyright 2009 QMUL. 00008 00009 This program is free software; you can redistribute it and/or 00010 modify it under the terms of the GNU General Public License as 00011 published by the Free Software Foundation; either version 2 of the 00012 License, or (at your option) any later version. See the file 00013 COPYING included with this distribution for more information. 00014 */ 00015 00016 #include "Dense3DModelPeakCache.h" 00017 00018 #include "base/Profiler.h" 00019 00020 Dense3DModelPeakCache::Dense3DModelPeakCache(DenseThreeDimensionalModel *source, 00021 int columnsPerPeak) : 00022 m_source(source), 00023 m_resolution(columnsPerPeak) 00024 { 00025 m_coverage.resize(1); // otherwise it is simply invalid 00026 00027 m_cache = new EditableDenseThreeDimensionalModel 00028 (source->getSampleRate(), 00029 getResolution(), 00030 source->getHeight(), 00031 EditableDenseThreeDimensionalModel::NoCompression, 00032 false); 00033 00034 connect(source, SIGNAL(modelChanged()), 00035 this, SLOT(sourceModelChanged())); 00036 connect(source, SIGNAL(aboutToBeDeleted()), 00037 this, SLOT(sourceModelAboutToBeDeleted())); 00038 00039 } 00040 00041 Dense3DModelPeakCache::~Dense3DModelPeakCache() 00042 { 00043 delete m_cache; 00044 } 00045 00046 bool 00047 Dense3DModelPeakCache::isColumnAvailable(int column) const 00048 { 00049 if (!m_source) return false; 00050 if (haveColumn(column)) return true; 00051 for (int i = m_resolution; i > 0; ) { 00052 --i; 00053 if (!m_source->isColumnAvailable(column * m_resolution + i)) { 00054 return false; 00055 } 00056 } 00057 return true; 00058 } 00059 00060 Dense3DModelPeakCache::Column 00061 Dense3DModelPeakCache::getColumn(int column) const 00062 { 00063 Profiler profiler("Dense3DModelPeakCache::getColumn"); 00064 if (!m_source) return Column(); 00065 if (!haveColumn(column)) fillColumn(column); 00066 return m_cache->getColumn(column); 00067 } 00068 00069 float 00070 Dense3DModelPeakCache::getValueAt(int column, int n) const 00071 { 00072 if (!m_source) return 0.f; 00073 if (!haveColumn(column)) fillColumn(column); 00074 return m_cache->getValueAt(column, n); 00075 } 00076 00077 void 00078 Dense3DModelPeakCache::sourceModelChanged() 00079 { 00080 if (!m_source) return; 00081 if (m_coverage.size() > 0) { 00082 // The last peak may have come from an incomplete read, which 00083 // may since have been filled, so reset it 00084 m_coverage.reset(m_coverage.size()-1); 00085 } 00086 m_coverage.resize(getWidth()); // retaining data 00087 } 00088 00089 void 00090 Dense3DModelPeakCache::sourceModelAboutToBeDeleted() 00091 { 00092 m_source = 0; 00093 } 00094 00095 bool 00096 Dense3DModelPeakCache::haveColumn(int column) const 00097 { 00098 return column < (int)m_coverage.size() && m_coverage.get(column); 00099 } 00100 00101 void 00102 Dense3DModelPeakCache::fillColumn(int column) const 00103 { 00104 Profiler profiler("Dense3DModelPeakCache::fillColumn"); 00105 00106 if (column >= (int)m_coverage.size()) { 00107 // see note in sourceModelChanged 00108 if (m_coverage.size() > 0) m_coverage.reset(m_coverage.size()-1); 00109 m_coverage.resize(column + 1); 00110 } 00111 00112 Column peak; 00113 for (int i = 0; i < int(m_resolution); ++i) { 00114 Column here = m_source->getColumn(column * m_resolution + i); 00115 if (i == 0) { 00116 peak = here; 00117 } else { 00118 for (int j = 0; j < (int)peak.size() && j < (int)here.size(); ++j) { 00119 if (here[j] > peak[j]) peak[j] = here[j]; 00120 } 00121 } 00122 } 00123 00124 m_cache->setColumn(column, peak); 00125 m_coverage.set(column); 00126 } 00127 00128