annotate data/fft/FFTFileCacheWriter.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_WRITER_H_
#define _FFT_FILE_CACHE_WRITER_H_

#include "FFTCacheStorageType.h"
#include "FFTCacheWriter.h"
#include "data/fileio/MatrixFile.h"

class FFTFileCacheWriter : public FFTCacheWriter
{
public:
    FFTFileCacheWriter(QString fileBase,
                       FFTCache::StorageType storageType,
                       size_t width, size_t height);
    ~FFTFileCacheWriter();

    size_t getWidth() const;
    size_t getHeight() const;

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

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

    bool haveSetColumnAt(size_t x) const;

    void allColumnsWritten();

    QString getFileBase() const;
    FFTCache::StorageType getStorageType() const { return m_storageType; }

protected:
    char *m_writebuf;

    void setNormalizationFactorToWritebuf(float newfactor) {
        size_t h = m_mfc->getHeight();
        if (h < m_factorSize) return;
        if (m_storageType != FFTCache::Compact) {
            ((float *)m_writebuf)[h - 1] = newfactor;
        } else {
            union {
                float f;
                uint16_t u[2];
            } factor;
            factor.f = newfactor;
            ((uint16_t *)m_writebuf)[h - 2] = factor.u[0];
            ((uint16_t *)m_writebuf)[h - 1] = factor.u[1];
        }
    }            

    QString m_fileBase;
    FFTCache::StorageType m_storageType;
    size_t m_factorSize;
    MatrixFile *m_mfc;
};

#endif