/// <summary>
/// Creates the BMD iterator and retrives the Mix Effect(s) banks from the ATEM
/// </summary>
private void getMEBlocks()
{
// ensure m_mixEffectBlocks is empty
nullifyMixEffectsBlocks();
// init the mix effects count, this is a zero-based count so we start at -1
int meCount = -1;
// meIteratorIID holds the COM class GUID of the iterator
Guid meIteratorIID = typeof(IBMDSwitcherMixEffectBlockIterator).GUID;
// meIteratorPtr holds the pointer to the mix effects iterator object
// create the iterator and out to the meIteratorPtr pointer
m_switcher.CreateIterator(ref meIteratorIID, out IntPtr meIteratorPtr);
// create the iterator
IBMDSwitcherMixEffectBlockIterator meIterator = (IBMDSwitcherMixEffectBlockIterator)Marshal.GetObjectForIUnknown(meIteratorPtr);
// bail if that returned null
if (meIterator == null)
{
return;
}
// now we can start to iterate over the ME blocks this ATEM has. Usually the basic ATEM's have only one Mix Effect Block. The 2M/E ATEM's have two. Some have more.
// try and get the Mix Effect Block from the iterator
meIterator.Next(out IBMDSwitcherMixEffectBlock meBlock);
// if that wasn't null then add to our array of ME Blocks
while (meBlock != null)
{
// We're not null, we increment our Mix Effect count!
meCount++;
// is this the first ME Block?
if (meCount == 0)
{
// Yes, so we init our ME Block array with just one item
m_mixEffectBlocks = new MEBlock[1];
m_mixEffectBlocks[0] = new MEBlock(meBlock, meCount);
}
else // otherwise we re-create our ME Block array and increase size by one!
{
MEBlock[] oldMEArray = m_mixEffectBlocks;
m_mixEffectBlocks = new MEBlock[meCount];
oldMEArray.CopyTo(m_mixEffectBlocks, 0);
m_mixEffectBlocks[meCount] = new MEBlock(meBlock, meCount);
}
// raise an event
// the consumer of this event should hook into the mbBlock events
MixEffectBlockConnectedEvent?.Invoke(this, new MixEffectBlockConnectedEventArgs(m_mixEffectBlocks[meCount]));
// Try and get the next block. A ref of null means there are no more Mix Effects Blocks on this ATEM
meIterator.Next(out meBlock);
}
}
public MixEffectBlockConnectedEventArgs(MEBlock connectedMEBlock)
{
ConnectedMEBlock = connectedMEBlock;
}
