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Improved deduction of PWX recording interval

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Fixes #533.
This commit is contained in:
Mark Liversedge
2013-03-29 15:33:14 +00:00
parent c024d36d6f
commit 830f4c5e63
1 changed files with 22 additions and 2 deletions
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24
src/PwxRideFile.cpp
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@@ -254,14 +254,34 @@ PwxFileReader::PwxFromDomDoc(QDomDocument doc, QStringList &errors) const
delete rideFile;
return NULL;
} else {
// need to determine the recIntSecs - first - second sample?
rideFile->setRecIntSecs(rideFile->dataPoints()[1]->secs -
rideFile->dataPoints()[0]->secs);
// To estimate the recording interval, take the median of the
// first 1000 samples and round to nearest millisecond.
int n = rideFile->dataPoints().size();
n = qMin(n, 1000);
if (n >= 2) {
QVector<double> secs(n-1);
for (int i = 0; i < n-1; ++i) {
double now = rideFile->dataPoints()[i]->secs;
double then = rideFile->dataPoints()[i+1]->secs;
secs[i] = then - now;
}
std::sort(secs.begin(), secs.end());
int mid = n / 2 - 1;
double recint = round(secs[mid] * 1000.0) / 1000.0;
rideFile->setRecIntSecs(recint);
} else {
// zero or one sample just make it a second
rideFile->setRecIntSecs(1);
}
// if its a daft number then make it 1s -- there is probably
// a gap in recording in there.
switch ((int)rideFile->recIntSecs()) {
case 1 : // lots!
case 2 : // Timex
case 4 : // garmin smart recording
case 5 : // polar sometimes
case 10 : // polar and others