view data/fft/FFTFileCacheWriter.h @ 631:3a5ee4b6c9ad

* Complete the overhaul of CSV file import; now you can pick the purpose for
  each column in the file, and SV should do the rest.  The most significant
  practical improvement here is that we can now handle files in which time
  and duration do not necessarily appear in known columns.

/* -*- 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