view data/fft/FFTFileCache.h @ 249:d3ac9f953ebf

* Fix #1672407 confused by plugin-named files in cwd (or home?)
* Fix #1491848 crash when loading new file while transform plugin runs
* Fix #1502287 Background remains black after spectrogram layer deleted
* Fix #1604477 Replacing the main audio file silences secondary audio file
* Fix failure to initialise property box layout to last preference on startup
* Fix resample/wrong-rate display in Pane, ensure that right rate is chosen
  if all current models have an acceptable rate even if previous main model
  had a different one
* Fix "global zoom" broken in previous commit
* Some fixes to spectrogram cache area updating (makes spectrogram appear
  more quickly, previously it had a tendency to refresh with empty space)
* Fixes to colour 3d plot normalization

/* -*- 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 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_H_
#define _FFT_FILE_CACHE_H_

#include "FFTCache.h"
#include "fileio/MatrixFile.h"

#include <QMutex>

class FFTFileCache : public FFTCache
{
public:
    enum StorageType {
        Compact, // 16 bits normalized polar
        Rectangular, // floating point real+imag
        Polar, // floating point mag+phase
    };

    FFTFileCache(QString fileBase, MatrixFile::Mode mode,
                 StorageType storageType);
    virtual ~FFTFileCache();

    MatrixFile::Mode getMode() const { return m_mfc->getMode(); }

    virtual size_t getWidth() const;
    virtual size_t getHeight() const;
	
    virtual void resize(size_t width, size_t height);
    virtual void reset(); // zero-fill or 1-fill as appropriate without changing size
	
    virtual float getMagnitudeAt(size_t x, size_t y) const;
    virtual float getNormalizedMagnitudeAt(size_t x, size_t y) const;
    virtual float getMaximumMagnitudeAt(size_t x) const;
    virtual float getPhaseAt(size_t x, size_t y) const;

    virtual void getValuesAt(size_t x, size_t y, float &real, float &imag) const;

    virtual bool haveSetColumnAt(size_t x) const;

    virtual void setColumnAt(size_t x, float *mags, float *phases, float factor);
    virtual void setColumnAt(size_t x, float *reals, float *imags);

    virtual void suspend() { m_mfc->suspend(); }

    static size_t getCacheSize(size_t width, size_t height, StorageType type);

protected:
    char *m_writebuf;
    mutable char *m_readbuf;
    mutable size_t m_readbufCol;
    mutable size_t m_readbufWidth;

    float getFromReadBufStandard(size_t x, size_t y) const {
        if (m_readbuf &&
            (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) {
            return ((float *)m_readbuf)[(x - m_readbufCol) * m_mfc->getHeight() + y];
        } else {
            populateReadBuf(x);
            return getFromReadBufStandard(x, y);
        }
    }

    float getFromReadBufCompactUnsigned(size_t x, size_t y) const {
        if (m_readbuf &&
            (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) {
            return ((uint16_t *)m_readbuf)[(x - m_readbufCol) * m_mfc->getHeight() + y];
        } else {
            populateReadBuf(x);
            return getFromReadBufCompactUnsigned(x, y);
        }
    }

    float getFromReadBufCompactSigned(size_t x, size_t y) const {
        if (m_readbuf &&
            (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) {
            return ((int16_t *)m_readbuf)[(x - m_readbufCol) * m_mfc->getHeight() + y];
        } else {
            populateReadBuf(x);
            return getFromReadBufCompactSigned(x, y);
        }
    }

    void populateReadBuf(size_t x) const;

    float getNormalizationFactor(size_t col) const {
        if (m_storageType != Compact) {
            return getFromReadBufStandard(col, m_mfc->getHeight() - 1);
        } else {
            float factor;
            factor = getFromReadBufCompactUnsigned(col, m_mfc->getHeight() - 1);
            return factor / 65535.0;
        }
    }

    MatrixFile *m_mfc;
    QMutex m_writeMutex;
    StorageType m_storageType;
};

#endif