view data/fft/FFTFileCacheReader.h @ 795:dc20458f6f85 qt5

Don't need to check for Dataquay, and in fact we can pick up the wrong version if we do. Just assume it is available (building in e.g. sv subdir configuration)

/* -*- 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