view data/fft/FFTFileCacheReader.cpp @ 875:3e6ed8a8577b tonioni

Use a sparse time-value model only for outputs with fixed bin count of 1, not for those with unknown bin count.
(Precursor to using more than one model for outputs with unknown bin count)

/* -*- 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 "FFTFileCacheReader.h"
#include "FFTFileCacheWriter.h"

#include "fileio/MatrixFile.h"

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

#include <iostream>


// 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.

FFTFileCacheReader::FFTFileCacheReader(FFTFileCacheWriter *writer) :
    m_readbuf(0),
    m_readbufCol(0),
    m_readbufWidth(0),
    m_readbufGood(false),
    m_storageType(writer->getStorageType()),
    m_factorSize(m_storageType == FFTCache::Compact ? 2 : 1),
    m_mfc(new MatrixFile
          (writer->getFileBase(),
           MatrixFile::ReadOnly,
           m_storageType == FFTCache::Compact ? sizeof(uint16_t) : sizeof(float),
           writer->getWidth(),
           writer->getHeight() * 2 + m_factorSize))
{
//    cerr << "FFTFileCacheReader: storage type is " << (storageType == FFTCache::Compact ? "Compact" : storageType == Polar ? "Polar" : "Rectangular") << endl;
}

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

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

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

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

    float value = 0.f;

    switch (m_storageType) {

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

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

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

    return value;
}

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

    switch (m_storageType) {

    case FFTCache::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
FFTFileCacheReader::getMaximumMagnitudeAt(size_t x) const
{
    return getNormalizationFactor(x);
}

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

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

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

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

    return value;
}

void
FFTFileCacheReader::getValuesAt(size_t x, size_t y, float &real, float &imag) const
{
//    SVDEBUG << "FFTFileCacheReader::getValuesAt(" << x << "," << y << ")" << endl;

    switch (m_storageType) {

    case FFTCache::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;
    }
}

void
FFTFileCacheReader::getMagnitudesAt(size_t x, float *values, size_t minbin, size_t count, size_t step) const
{
    Profiler profiler("FFTFileCacheReader::getMagnitudesAt");

    switch (m_storageType) {

    case FFTCache::Compact:
        for (size_t i = 0; i < count; ++i) {
            size_t y = minbin + i * step;
            values[i] = (getFromReadBufCompactUnsigned(x, y * 2) / 65535.0)
                * getNormalizationFactor(x);
        }
        break;

    case FFTCache::Rectangular:
    {
        float real, imag;
        for (size_t i = 0; i < count; ++i) {
            size_t y = minbin + i * step;
            real = getFromReadBufStandard(x, y * 2);
            imag = getFromReadBufStandard(x, y * 2 + 1);
            values[i] = sqrtf(real * real + imag * imag);
        }
        break;
    }

    case FFTCache::Polar:
        for (size_t i = 0; i < count; ++i) {
            size_t y = minbin + i * step;
            values[i] = getFromReadBufStandard(x, y * 2);
        }
        break;
    }
}

bool
FFTFileCacheReader::haveSetColumnAt(size_t x) const
{
    if (m_readbuf && m_readbufGood &&
        (m_readbufCol == x || (m_readbufWidth > 1 && m_readbufCol+1 == x))) {
//        SVDEBUG << "FFTFileCacheReader::haveSetColumnAt: short-circuiting; we know about this one" << endl;
        return true;
    }
    return m_mfc->haveSetColumnAt(x);
}

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

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

//    SVDEBUG << "FFTFileCacheReader::populateReadBuf(" << x << ")" << endl;

    if (!m_readbuf) {
        m_readbuf = new char[m_mfc->getHeight() * 2 * m_mfc->getCellSize()];
    }

    m_readbufGood = false;

    try {
        bool good = false;
        if (m_mfc->haveSetColumnAt(x)) {
            // If the column is not available, we have no obligation
            // to do anything with the readbuf -- we can cheerfully
            // return garbage.  It's the responsibility of the caller
            // to check haveSetColumnAt before trusting any retrieved
            // data.  However, we do record whether the data in the
            // readbuf is good or not, because we can use that to
            // return an immediate result for haveSetColumnAt if the
            // column is right.
            good = true;
            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_readbufGood = good;
    } catch (FileReadFailed f) {
        cerr << "ERROR: FFTFileCacheReader::populateReadBuf: File read failed: "
                  << f.what() << endl;
        memset(m_readbuf, 0, m_mfc->getHeight() * 2 * m_mfc->getCellSize());
    }
    m_readbufCol = x;
}