Mercurial > hg > svcore
view data/fft/FFTFileCacheReader.h @ 779:15cd67fcbdad
Fix calculation of timestamps for fixed-rate features
author | Chris Cannam |
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date | Wed, 27 Mar 2013 15:27:33 +0000 |
parents | 8accc7969c1c |
children | 59e7fe1b1003 |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006-2009 Chris Cannam and QMUL. 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 2 of the License, or (at your option) any later version. See the file COPYING included with this distribution for more information. */ #ifndef _FFT_FILE_CACHE_READER_H_ #define _FFT_FILE_CACHE_READER_H_ #include "data/fileio/MatrixFile.h" #include "FFTCacheReader.h" #include "FFTCacheStorageType.h" class FFTFileCacheWriter; class FFTFileCacheReader : public FFTCacheReader { public: FFTFileCacheReader(FFTFileCacheWriter *); ~FFTFileCacheReader(); size_t getWidth() const; size_t getHeight() const; float getMagnitudeAt(size_t x, size_t y) const; float getNormalizedMagnitudeAt(size_t x, size_t y) const; float getMaximumMagnitudeAt(size_t x) const; float getPhaseAt(size_t x, size_t y) const; void getValuesAt(size_t x, size_t y, float &real, float &imag) const; void getMagnitudesAt(size_t x, float *values, size_t minbin, size_t count, size_t step) const; bool haveSetColumnAt(size_t x) const; static size_t getCacheSize(size_t width, size_t height, FFTCache::StorageType type); FFTCache::StorageType getStorageType() const { return m_storageType; } protected: mutable char *m_readbuf; mutable size_t m_readbufCol; mutable size_t m_readbufWidth; mutable bool m_readbufGood; float getFromReadBufStandard(size_t x, size_t y) const { float v; if (m_readbuf && (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) { v = ((float *)m_readbuf)[(x - m_readbufCol) * m_mfc->getHeight() + y]; return v; } else { populateReadBuf(x); v = getFromReadBufStandard(x, y); return v; } } float getFromReadBufCompactUnsigned(size_t x, size_t y) const { float v; if (m_readbuf && (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) { v = ((uint16_t *)m_readbuf)[(x - m_readbufCol) * m_mfc->getHeight() + y]; return v; } else { populateReadBuf(x); v = getFromReadBufCompactUnsigned(x, y); return v; } } float getFromReadBufCompactSigned(size_t x, size_t y) const { float v; if (m_readbuf && (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) { v = ((int16_t *)m_readbuf)[(x - m_readbufCol) * m_mfc->getHeight() + y]; return v; } else { populateReadBuf(x); v = getFromReadBufCompactSigned(x, y); return v; } } void populateReadBuf(size_t x) const; float getNormalizationFactor(size_t col) const { size_t h = m_mfc->getHeight(); if (h < m_factorSize) return 0; if (m_storageType != FFTCache::Compact) { return getFromReadBufStandard(col, h - 1); } else { union { float f; uint16_t u[2]; } factor; if (!m_readbuf || !(m_readbufCol == col || (m_readbufWidth > 1 && m_readbufCol+1 == col))) { populateReadBuf(col); } size_t ix = (col - m_readbufCol) * m_mfc->getHeight() + h; factor.u[0] = ((uint16_t *)m_readbuf)[ix - 2]; factor.u[1] = ((uint16_t *)m_readbuf)[ix - 1]; return factor.f; } } FFTCache::StorageType m_storageType; size_t m_factorSize; MatrixFile *m_mfc; }; #endif