view data/model/Dense3DModelPeakCache.cpp @ 1752:6d09d68165a4 by-id

Further review of ById: make IDs only available when adding a model to the ById store, not by querying the item directly. This means any id encountered in the wild must have been added to the store at some point (even if later released), which simplifies reasoning about lifecycles

/* -*- 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 2009 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 "Dense3DModelPeakCache.h"

#include "base/Profiler.h"

#include "base/HitCount.h"

Dense3DModelPeakCache::Dense3DModelPeakCache(ModelId sourceId,
                                             int columnsPerPeak) :
    m_source(sourceId),
    m_columnsPerPeak(columnsPerPeak)
{
    auto source = ModelById::getAs<DenseThreeDimensionalModel>(m_source);
    if (!source) {
        SVCERR << "WARNING: Dense3DModelPeakCache constructed for unknown or wrong-type source model id " << m_source << endl;
        m_source = {};
        return;
    }

    m_cache.reset(new EditableDenseThreeDimensionalModel
                  (source->getSampleRate(),
                   source->getResolution() * m_columnsPerPeak,
                   source->getHeight(),
                   EditableDenseThreeDimensionalModel::NoCompression,
                   false));

    connect(source.get(), SIGNAL(modelChanged(ModelId)),
            this, SLOT(sourceModelChanged(ModelId)));
}

Dense3DModelPeakCache::~Dense3DModelPeakCache()
{
}

Dense3DModelPeakCache::Column
Dense3DModelPeakCache::getColumn(int column) const
{
    if (!haveColumn(column)) fillColumn(column);
    return m_cache->getColumn(column);
}

float
Dense3DModelPeakCache::getValueAt(int column, int n) const
{
    if (!haveColumn(column)) fillColumn(column);
    return m_cache->getValueAt(column, n);
}

void
Dense3DModelPeakCache::sourceModelChanged(ModelId)
{
    if (m_coverage.size() > 0) {
        // The last peak may have come from an incomplete read, which
        // may since have been filled, so reset it
        m_coverage[m_coverage.size()-1] = false;
    }
    m_coverage.resize(getWidth(), false); // retaining data
}

bool
Dense3DModelPeakCache::haveColumn(int column) const
{
    static HitCount count("Dense3DModelPeakCache");
    if (in_range_for(m_coverage, column) && m_coverage[column]) {
        count.hit();
        return true;
    } else {
        count.miss();
        return false;
    }
}

void
Dense3DModelPeakCache::fillColumn(int column) const
{
    Profiler profiler("Dense3DModelPeakCache::fillColumn");

    if (!in_range_for(m_coverage, column)) {
        if (m_coverage.size() > 0) {
            // The last peak may have come from an incomplete read, which
            // may since have been filled, so reset it
            m_coverage[m_coverage.size()-1] = false;
        }
        m_coverage.resize(column + 1, false);
    }

    auto source = ModelById::getAs<DenseThreeDimensionalModel>(m_source);
    if (!source) return;
    
    int sourceWidth = source->getWidth();
    
    Column peak;
    int n = 0;
    for (int i = 0; i < m_columnsPerPeak; ++i) {

        int sourceColumn = column * m_columnsPerPeak + i;
        if (sourceColumn >= sourceWidth) break;
        
        Column here = source->getColumn(sourceColumn);

//        cerr << "Dense3DModelPeakCache::fillColumn(" << column << "): source col "
//             << sourceColumn << " of " << sourceWidth
//             << " returned " << here.size() << " elts" << endl;
        
        if (i == 0) {
            peak = here;
            n = int(peak.size());
        } else {
            int m = std::min(n, int(here.size()));
            for (int j = 0; j < m; ++j) {
                peak[j] = std::max(here[j], peak[j]);
            }
        }
    }

    m_cache->setColumn(column, peak);
    m_coverage[column] = true;
}