FFTFileCache.cpp

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/* -*- 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.
*/

#include "FFTFileCache.h"

#include "fileio/MatrixFile.h"

#include "base/Profiler.h"

#include <iostream>

#include <QMutexLocker>


// 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.

FFTFileCache::FFTFileCache(QString fileBase, MatrixFile::Mode mode,
                           StorageType storageType) :
    m_writebuf(0),
    m_readbuf(0),
    m_readbufCol(0),
    m_readbufWidth(0),
    m_mfc(new MatrixFile
          (fileBase, mode, 
           storageType == Compact ? sizeof(uint16_t) : sizeof(float),
           mode == MatrixFile::ReadOnly)),
    m_storageType(storageType),
    m_factorSize(storageType == Compact ? 2 : 1)
{
//    std::cerr << "FFTFileCache: storage type is " << (storageType == Compact ? "Compact" : storageType == Polar ? "Polar" : "Rectangular") << std::endl;
}

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

size_t
FFTFileCache::getWidth() const
{
    return m_mfc->getWidth();
}

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

void
FFTFileCache::resize(size_t width, size_t height)
{
    QMutexLocker locker(&m_writeMutex);

    m_mfc->resize(width, height * 2 + m_factorSize);
    if (m_readbuf) {
        delete[] m_readbuf;
        m_readbuf = 0;
    }
    if (m_writebuf) {
        delete[] m_writebuf;
    }
    m_writebuf = new char[(height * 2 + m_factorSize) * m_mfc->getCellSize()];
}

void
FFTFileCache::reset()
{
    m_mfc->reset();
}

float
FFTFileCache::getMagnitudeAt(size_t x, size_t y) const
{
    Profiler profiler("FFTFileCache::getMagnitudeAt", false);

    float value = 0.f;

    switch (m_storageType) {

    case Compact:
        value = (getFromReadBufCompactUnsigned(x, y * 2) / 65535.0)
            * getNormalizationFactor(x);
        break;

    case Rectangular:
    {
        float real, imag;
        getValuesAt(x, y, real, imag);
        value = sqrtf(real * real + imag * imag);
        break;
    }

    case Polar:
        value = getFromReadBufStandard(x, y * 2);
        break;
    }

    return value;
}

float
FFTFileCache::getNormalizedMagnitudeAt(size_t x, size_t y) const
{
    float value = 0.f;

    switch (m_storageType) {

    case Compact:
        value = getFromReadBufCompactUnsigned(x, y * 2) / 65535.0;
        break;

    default:
    {
        float mag = getMagnitudeAt(x, y);
        float factor = getNormalizationFactor(x);
        if (factor != 0) value = mag / factor;
        else value = 0.f;
        break;
    }
    }

    return value;
}

float
FFTFileCache::getMaximumMagnitudeAt(size_t x) const
{
    return getNormalizationFactor(x);
}

float
FFTFileCache::getPhaseAt(size_t x, size_t y) const
{
    float value = 0.f;
    
    switch (m_storageType) {

    case Compact:
        value = (getFromReadBufCompactSigned(x, y * 2 + 1) / 32767.0) * M_PI;
        break;

    case Rectangular:
    {
        float real, imag;
        getValuesAt(x, y, real, imag);
        value = princargf(atan2f(imag, real));
        break;
    }

    case Polar:
        value = getFromReadBufStandard(x, y * 2 + 1);
        break;
    }

    return value;
}

void
FFTFileCache::getValuesAt(size_t x, size_t y, float &real, float &imag) const
{
    switch (m_storageType) {

    case Rectangular:
        real = getFromReadBufStandard(x, y * 2);
        imag = getFromReadBufStandard(x, y * 2 + 1);
        return;

    default:
        float mag = getMagnitudeAt(x, y);
        float phase = getPhaseAt(x, y);
        real = mag * cosf(phase);
        imag = mag * sinf(phase);
        return;
    }
}

bool
FFTFileCache::haveSetColumnAt(size_t x) const
{
    return m_mfc->haveSetColumnAt(x);
}

void
FFTFileCache::setColumnAt(size_t x, float *mags, float *phases, float factor)
{
    QMutexLocker locker(&m_writeMutex);

    size_t h = getHeight();

    switch (m_storageType) {

    case Compact:
        for (size_t 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 Rectangular:
        for (size_t 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 Polar:
        for (size_t 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;
//    std::cerr << "Column " << x << ": normalization factor: " << factor << ", max " << maxFactor << " (height " << getHeight() << ")" << std::endl;

    setNormalizationFactorToWritebuf(factor);

    m_mfc->setColumnAt(x, m_writebuf);
}

void
FFTFileCache::setColumnAt(size_t x, float *real, float *imag)
{
    QMutexLocker locker(&m_writeMutex);

    size_t h = getHeight();

    float factor = 0.0f;

    switch (m_storageType) {

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

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

    setNormalizationFactorToWritebuf(factor);

    m_mfc->setColumnAt(x, m_writebuf);
}

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

void
FFTFileCache::populateReadBuf(size_t x) const
{
    Profiler profiler("FFTFileCache::populateReadBuf", false);

    if (!m_readbuf) {
        m_readbuf = new char[m_mfc->getHeight() * 2 * m_mfc->getCellSize()];
    }
    m_mfc->getColumnAt(x, m_readbuf);
    if (m_mfc->haveSetColumnAt(x + 1)) {
        m_mfc->getColumnAt
            (x + 1, m_readbuf + m_mfc->getCellSize() * m_mfc->getHeight());
        m_readbufWidth = 2;
    } else {
        m_readbufWidth = 1;
    }
    m_readbufCol = x;
}

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