/**
* \return String representing the given number, expressed as fraction (# #/#).
*/
QString RMath::toFractionString(double v, int maxDenominator) {
int number, numerator, denominator;
toFraction(v, maxDenominator, number, numerator, denominator);
if (number==0) {
return QString("%1/%2").arg(numerator).arg(denominator);
}
else {
if (numerator==0) {
return QString("%1").arg(number);
}
else {
return QString("%1 %2/%3").arg(number).arg(numerator).arg(denominator);
}
}
}
/*!
* \brief OpenIMAJCapGStreamer::setProperty
* \param propId
* \param value
* \return success
* Sets the desired property id with val. If the pipeline is running,
* it is briefly stopped and started again after the property was set
*/
bool OpenIMAJCapGStreamer::setProperty( int propId, double value )
{
GstFormat format;
GstSeekFlags flags;
if(!pipeline) {
WARN("GStreamer: no pipeline");
return false;
}
bool wasPlaying = this->isPipelinePlaying();
if (wasPlaying)
this->stopPipeline();
switch(propId) {
case CAP_PROP_POS_MSEC:
format = GST_FORMAT_TIME;
flags = (GstSeekFlags) (GST_SEEK_FLAG_FLUSH|GST_SEEK_FLAG_ACCURATE);
if(!gst_element_seek_simple(GST_ELEMENT(pipeline), format,
flags, (gint64) (value * GST_MSECOND))) {
WARN("GStreamer: unable to seek");
}
break;
case CAP_PROP_POS_FRAMES:
format = GST_FORMAT_DEFAULT;
flags = (GstSeekFlags) (GST_SEEK_FLAG_FLUSH|GST_SEEK_FLAG_ACCURATE);
if(!gst_element_seek_simple(GST_ELEMENT(pipeline), format,
flags, (gint64) value)) {
WARN("GStreamer: unable to seek");
}
break;
case CAP_PROP_POS_AVI_RATIO:
format = GST_FORMAT_PERCENT;
flags = (GstSeekFlags) (GST_SEEK_FLAG_FLUSH|GST_SEEK_FLAG_ACCURATE);
if(!gst_element_seek_simple(GST_ELEMENT(pipeline), format,
flags, (gint64) (value * GST_FORMAT_PERCENT_MAX))) {
WARN("GStreamer: unable to seek");
}
break;
case CAP_PROP_FRAME_WIDTH:
if(value > 0)
setFilter("width", G_TYPE_INT, (int) value, 0);
else
removeFilter("width");
break;
case CAP_PROP_FRAME_HEIGHT:
if(value > 0)
setFilter("height", G_TYPE_INT, (int) value, 0);
else
removeFilter("height");
break;
case CAP_PROP_FPS:
if(value > 0) {
double num=0, denom = 1;
toFraction(value, num, denom);
setFilter("framerate", GST_TYPE_FRACTION, value, denom);
} else
removeFilter("framerate");
break;
case CAP_GSTREAMER_QUEUE_LENGTH:
if(!sink)
break;
gst_app_sink_set_max_buffers(GST_APP_SINK(sink), (guint) value);
break;
default:
WARN("GStreamer: unhandled property");
}
if (wasPlaying)
this->startPipeline();
return false;
}
