diff data/fileio/FFTFileCache.cpp @ 148:1a42221a1522

* Reorganising code base.  This revision will not compile.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/fileio/FFTFileCache.cpp	Mon Jul 31 11:49:58 2006 +0000
@@ -0,0 +1,288 @@
+/* -*- 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.
+    
+    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 "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].
+
+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)
+{
+    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 > 0) return (mh - 1) / 2;
+    else return 0;
+}
+
+void
+FFTFileCache::resize(size_t width, size_t height)
+{
+    QMutexLocker locker(&m_writeMutex);
+
+    m_mfc->resize(width, height * 2 + 1);
+    if (m_readbuf) {
+        delete[] m_readbuf;
+        m_readbuf = 0;
+    }
+    if (m_writebuf) {
+        delete[] m_writebuf;
+    }
+    m_writebuf = new char[(height * 2 + 1) * m_mfc->getCellSize()];
+}
+
+void
+FFTFileCache::reset()
+{
+    m_mfc->reset();
+}
+
+float
+FFTFileCache::getMagnitudeAt(size_t x, size_t y) const
+{
+    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 << "Normalization factor: " << factor << ", max " << maxFactor << " (height " << getHeight() << ")" << std::endl;
+
+    if (m_storageType == Compact) {
+        ((uint16_t *)m_writebuf)[h * 2] = factor * 65535.0;
+    } else {
+        ((float *)m_writebuf)[h * 2] = 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 max = 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 > max) max = 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 / max) * 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 > max) max = 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 > max) max = mag;
+            ((float *)m_writebuf)[y * 2] = mag;
+            ((float *)m_writebuf)[y * 2 + 1] = princargf(atan2f(imag[y], real[y]));
+        }
+        break;
+    }
+
+    ((float *)m_writebuf)[h * 2] = max;
+    m_mfc->setColumnAt(x, m_writebuf);
+}
+