view data/fft/FFTFileCacheWriter.cpp @ 1008:d9e0e59a1581

When using an aggregate model to pass data to a transform, zero-pad the shorter input to the duration of the longer rather than truncating the longer. (This is better behaviour for e.g. MATCH, and in any case the code was previously truncating incorrectly and ending up with garbage data at the end.)

/* -*- 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.
*/

#include "FFTFileCacheWriter.h"

#include "fileio/MatrixFile.h"

#include "base/Profiler.h"
#include "base/Thread.h"
#include "base/Exceptions.h"

#include <iostream>

//#define DEBUG_FFT_FILE_CACHE_WRITER 1


// The underlying matrix has height (m_height * 2 + 1).  In each
// column we store magnitude at [0], [2] etc and phase at [1], [3]
// etc, and then store the normalization factor (maximum magnitude) at
// [m_height * 2].  In compact mode, the factor takes two cells.

FFTFileCacheWriter::FFTFileCacheWriter(QString fileBase,
                                       FFTCache::StorageType storageType,
                                       int width, int height) :
    m_writebuf(0),
    m_fileBase(fileBase),
    m_storageType(storageType),
    m_factorSize(storageType == FFTCache::Compact ? 2 : 1),
    m_mfc(new MatrixFile
          (fileBase, MatrixFile::WriteOnly, 
           storageType == FFTCache::Compact ? sizeof(uint16_t) : sizeof(float),
           width, height * 2 + m_factorSize))
{
#ifdef DEBUG_FFT_FILE_CACHE_WRITER
    cerr << "FFTFileCacheWriter: storage type is " << (storageType == FFTCache::Compact ? "Compact" : storageType == FFTCache::Polar ? "Polar" : "Rectangular") << ", size " << width << "x" << height << endl;
#endif
    m_mfc->setAutoClose(true);
    m_writebuf = new char[(height * 2 + m_factorSize) * m_mfc->getCellSize()];
}

FFTFileCacheWriter::~FFTFileCacheWriter()
{
    if (m_writebuf) delete[] m_writebuf;
    delete m_mfc;
}

QString
FFTFileCacheWriter::getFileBase() const
{
    return m_fileBase;
}

int
FFTFileCacheWriter::getWidth() const
{
    return m_mfc->getWidth();
}

int
FFTFileCacheWriter::getHeight() const
{
    int mh = m_mfc->getHeight();
    if (mh > m_factorSize) return (mh - m_factorSize) / 2;
    else return 0;
}

bool
FFTFileCacheWriter::haveSetColumnAt(int x) const
{
    return m_mfc->haveSetColumnAt(x);
}

void
FFTFileCacheWriter::setColumnAt(int x, float *mags, float *phases, float factor)
{
    int h = getHeight();

    switch (m_storageType) {

    case FFTCache::Compact:
        for (int y = 0; y < h; ++y) {
            ((uint16_t *)m_writebuf)[y * 2] = uint16_t((mags[y] / factor) * 65535.0);
            ((uint16_t *)m_writebuf)[y * 2 + 1] = uint16_t(int16_t((phases[y] * 32767) / M_PI));
        }
        break;

    case FFTCache::Rectangular:
        for (int y = 0; y < h; ++y) {
            ((float *)m_writebuf)[y * 2] = mags[y] * cosf(phases[y]);
            ((float *)m_writebuf)[y * 2 + 1] = mags[y] * sinf(phases[y]);
        }
        break;

    case FFTCache::Polar:
        for (int y = 0; y < h; ++y) {
            ((float *)m_writebuf)[y * 2] = mags[y];
            ((float *)m_writebuf)[y * 2 + 1] = phases[y];
        }
        break;
    }

    static float maxFactor = 0;
    if (factor > maxFactor) maxFactor = factor;
#ifdef DEBUG_FFT_FILE_CACHE_WRITER
    cerr << "Column " << x << ": normalization factor: " << factor << ", max " << maxFactor << " (height " << getHeight() << ")" << endl;
#endif

    setNormalizationFactorToWritebuf(factor);

    m_mfc->setColumnAt(x, m_writebuf);
}

void
FFTFileCacheWriter::setColumnAt(int x, float *real, float *imag)
{
    int h = getHeight();

    float factor = 0.0f;

    switch (m_storageType) {

    case FFTCache::Compact:
        for (int y = 0; y < h; ++y) {
            float mag = sqrtf(real[y] * real[y] + imag[y] * imag[y]);
            if (mag > factor) factor = mag;
        }
        for (int y = 0; y < h; ++y) {
            float mag = sqrtf(real[y] * real[y] + imag[y] * imag[y]);
            float phase = atan2f(imag[y], real[y]);
            ((uint16_t *)m_writebuf)[y * 2] = uint16_t((mag / factor) * 65535.0);
            ((uint16_t *)m_writebuf)[y * 2 + 1] = uint16_t(int16_t((phase * 32767) / M_PI));
        }
        break;

    case FFTCache::Rectangular:
        for (int y = 0; y < h; ++y) {
            ((float *)m_writebuf)[y * 2] = real[y];
            ((float *)m_writebuf)[y * 2 + 1] = imag[y];
            float mag = sqrtf(real[y] * real[y] + imag[y] * imag[y]);
            if (mag > factor) factor = mag;
        }
        break;

    case FFTCache::Polar:
        for (int y = 0; y < h; ++y) {
            float mag = sqrtf(real[y] * real[y] + imag[y] * imag[y]);
            if (mag > factor) factor = mag;
            ((float *)m_writebuf)[y * 2] = mag;
            float phase = atan2f(imag[y], real[y]);
            ((float *)m_writebuf)[y * 2 + 1] = phase;
        }
        break;
    }

    static float maxFactor = 0;
    if (factor > maxFactor) maxFactor = factor;
#ifdef DEBUG_FFT_FILE_CACHE_WRITER
    cerr << "[RI] Column " << x << ": normalization factor: " << factor << ", max " << maxFactor << " (height " << getHeight() << ")" << endl;
#endif

    setNormalizationFactorToWritebuf(factor);

    m_mfc->setColumnAt(x, m_writebuf);
}

int
FFTFileCacheWriter::getCacheSize(int width, int height,
                                 FFTCache::StorageType type)
{
    return (height * 2 + (type == FFTCache::Compact ? 2 : 1)) * width *
        (type == FFTCache::Compact ? sizeof(uint16_t) : sizeof(float)) +
        2 * sizeof(int); // matrix file header size
}

void
FFTFileCacheWriter::allColumnsWritten()
{
#ifdef DEBUG_FFT_FILE_CACHE_WRITER
    SVDEBUG << "FFTFileCacheWriter::allColumnsWritten" << endl;
#endif
    m_mfc->close();
}