view data/fft/FFTFileCacheWriter.h @ 537:3cc4b7cd2aa5

* Merge from one-fftdataserver-per-fftmodel branch. This bit of reworking (which is not described very accurately by the title of the branch) turns the MatrixFile object into something that either reads or writes, but not both, and separates the FFT file cache reader and writer implementations separately. This allows the FFT data server to have a single thread owning writers and one reader per "customer" thread, and for all locking to be vastly simplified and concentrated in the data server alone (because none of the classes it makes use of is used in more than one thread at a time). The result is faster and more trustworthy code.
author Chris Cannam
date Tue, 27 Jan 2009 13:25:10 +0000
parents
children 107d3f3705c9
line wrap: on
line source
/* -*- 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);

    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