// Process a color balance command
static void UpdateColorChannel(string channelName, bool increase, Gst.Video.IColorBalance cb)
{
// Retrieve the list of channels and locate the requested one
var channels = cb.ListChannels ();
Gst.Video.ColorBalanceChannel channel = null;
foreach (var ch in channels) {
var label = ch.Label;
if (label.Contains (channelName)) {
channel = ch;
break;
}
}
if (channel == null)
return;
// Change the channel's value
var step = 0.1 * (channel.MaxValue - channel.MinValue);
var value = cb.GetValue (channel);
if (increase) {
value = (int)(value + step);
if (value > channel.MaxValue)
value = channel.MaxValue;
} else {
value = (int)(value - step);
if (value < channel.MinValue)
value = channel.MinValue;
}
cb.SetValue (channel, value);
}
