annotate data/model/Dense3DModelPeakCache.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 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"

Dense3DModelPeakCache::Dense3DModelPeakCache(DenseThreeDimensionalModel *source,
					     int columnsPerPeak) :
    m_source(source),
    m_resolution(columnsPerPeak)
{
    m_coverage.resize(1); // otherwise it is simply invalid

    m_cache = new EditableDenseThreeDimensionalModel
        (source->getSampleRate(),
         getResolution(),
         source->getHeight(),
         EditableDenseThreeDimensionalModel::NoCompression,
         false);

    connect(source, SIGNAL(modelChanged()),
            this, SLOT(sourceModelChanged()));
    connect(source, SIGNAL(aboutToBeDeleted()),
            this, SLOT(sourceModelAboutToBeDeleted()));

}

Dense3DModelPeakCache::~Dense3DModelPeakCache()
{
    delete m_cache;
}

bool
Dense3DModelPeakCache::isColumnAvailable(int column) const
{
    if (!m_source) return false;
    if (haveColumn(column)) return true;
    for (int i = m_resolution; i > 0; ) {
        --i;
        if (!m_source->isColumnAvailable(column * m_resolution + i)) {
            return false;
        }
    }
    return true;
}

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

float
Dense3DModelPeakCache::getValueAt(int column, int n) const
{
    if (!m_source) return 0.f;
    if (!haveColumn(column)) fillColumn(column);
    return m_cache->getValueAt(column, n);
}

void
Dense3DModelPeakCache::sourceModelChanged()
{
    if (!m_source) return;
    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.reset(m_coverage.size()-1);
    }
    m_coverage.resize(getWidth()); // retaining data
}

void
Dense3DModelPeakCache::sourceModelAboutToBeDeleted()
{
    m_source = 0;
}

bool
Dense3DModelPeakCache::haveColumn(int column) const
{
    return column < (int)m_coverage.size() && m_coverage.get(column);
}

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

    if (column >= (int)m_coverage.size()) {
        // see note in sourceModelChanged
        if (m_coverage.size() > 0) m_coverage.reset(m_coverage.size()-1);
        m_coverage.resize(column + 1);
    }

    Column peak;
    for (int i = 0; i < int(m_resolution); ++i) {
        Column here = m_source->getColumn(column * m_resolution + i);
        if (i == 0) {
            peak = here;
        } else {
            for (int j = 0; j < (int)peak.size() && j < (int)here.size(); ++j) {
                if (here[j] > peak[j]) peak[j] = here[j];
            }
        }
    }

    m_cache->setColumn(column, peak);
    m_coverage.set(column);
}