Play a Midi file? MidiMessageSequence -> MidiBuffer


#1

I see MidiFile allows access to MidiMessageSequence, however to play midi it appears that a MidiBuffer is needed instead. I don't see a conversion from one to the other.

After that it appears I get the the default midi output from the AudioDeviceManager, and send it the midi buffer, but that part is particularly clear either. It seems like I would have found an example, but did not.


#2

The two classes have different purposes - MidiMessageSequence is a higher-level object, which knows about matching note on/off pairs and lets you edit the sequence. MidiBuffer is a low-level packed array, which can be iterated but not really modified.


#3

MidFile loads MidiMessageSequence, I presume there is a convenience method to convert to MidiBuffer so it can be played?


#4

You'd rarely ever need to convert a whole MidiMessageSequence into a single MidiBuffer, because you'd never want to play the entire file as one block. Generally you'll be given a MidiBuffer to fill by something like AudioProcessor::processBlock, and you'd only want to fill it with whatever small section of the MidiMessageSequence is being played. I don't have any helper methods to do that, I'm afraid, but it's easy enough to iterate it and add the messages.


#5

I assumed if I call this...

AudioDeviceManager::getDefaultMediaOutput->sendBlockOfMessages(midiBuffer)

It would play the song, and prior to that an AudioProcessor could be registered to display the notes being played... 

If I'm filling the processBlock(midibuffer), then I'm lost on how I would fill it with appropriate notes. Example anywhere?