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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 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 "LinearAligner.h"
#include "system/System.h"
#include "data/model/Path.h"
#include "data/model/AlignmentModel.h"
#include "framework/Document.h"
#include "svcore/data/model/DenseTimeValueModel.h"
#include <QApplication>
namespace sv {
LinearAligner::LinearAligner(Document *doc,
ModelId reference,
ModelId toAlign,
bool trimmed) :
m_document(doc),
m_reference(reference),
m_toAlign(toAlign),
m_trimmed(trimmed)
{
}
LinearAligner::~LinearAligner()
{
}
void
LinearAligner::begin()
{
bool ready = false;
while (!ready) {
{ // scope so as to release input shared_ptr before sleeping
auto reference = ModelById::get(m_reference);
auto toAlign = ModelById::get(m_toAlign);
if (!reference || !reference->isOK() ||
!toAlign || !toAlign->isOK()) {
return;
}
ready = (reference->isReady() && toAlign->isReady());
}
if (!ready) {
SVDEBUG << "LinearAligner: Waiting for models..." << endl;
QApplication::processEvents(QEventLoop::ExcludeUserInputEvents |
QEventLoop::ExcludeSocketNotifiers,
500);
}
}
auto reference = ModelById::get(m_reference);
auto toAlign = ModelById::get(m_toAlign);
if (!reference || !reference->isOK() ||
!toAlign || !toAlign->isOK()) {
return;
}
sv_frame_t s0, e0, s1, e1;
s0 = reference->getStartFrame();
e0 = reference->getEndFrame();
s1 = toAlign->getStartFrame();
e1 = toAlign->getEndFrame();
if (m_trimmed) {
getTrimmedExtents(m_reference, s0, e0);
getTrimmedExtents(m_toAlign, s1, e1);
SVCERR << "Trimmed extents: reference: " << s0 << " to " << e0
<< ", toAlign: " << s1 << " to " << e1 << endl;
}
sv_frame_t d0 = e0 - s0, d1 = e1 - s1;
if (d1 == 0) {
return;
}
double ratio = double(d0) / double(d1);
int resolution = 1024;
Path path(reference->getSampleRate(), resolution);
for (sv_frame_t f = s1; f < e1; f += resolution) {
sv_frame_t target = s0 + sv_frame_t(double(f - s1) * ratio);
path.add(PathPoint(f, target));
}
auto alignment = std::make_shared<AlignmentModel>(m_reference,
m_toAlign,
ModelId());
auto alignmentModelId = ModelById::add(alignment);
alignment->setPath(path);
alignment->setCompletion(100);
toAlign->setAlignment(alignmentModelId);
m_document->addNonDerivedModel(alignmentModelId);
emit complete(alignmentModelId);
}
bool
LinearAligner::getTrimmedExtents(ModelId modelId,
sv_frame_t &start,
sv_frame_t &end)
{
auto model = ModelById::getAs<DenseTimeValueModel>(modelId);
if (!model) return false;
sv_frame_t chunksize = 1024;
double threshold = 1e-2;
auto rms = [](const floatvec_t &samples) {
double rms = 0.0;
for (auto s: samples) {
rms += s * s;
}
rms /= double(samples.size());
rms = sqrt(rms);
return rms;
};
while (start < end) {
floatvec_t samples = model->getData(-1, start, chunksize);
if (samples.empty()) {
return false; // no non-silent content found
}
if (rms(samples) > threshold) {
for (auto s: samples) {
if (fabsf(s) > threshold) {
break;
}
++start;
}
break;
}
start += chunksize;
}
if (start >= end) {
return false;
}
while (end > start) {
sv_frame_t probe = end - chunksize;
if (probe < 0) probe = 0;
floatvec_t samples = model->getData(-1, probe, chunksize);
if (samples.empty()) {
break;
}
if (rms(samples) > threshold) {
break;
}
end = probe;
}
return (end > start);
}
} // end namespace sv
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