Re: MusicSequenceSetMIDIEndpoint Question
Re: MusicSequenceSetMIDIEndpoint Question
- Subject: Re: MusicSequenceSetMIDIEndpoint Question
- From: Peter Zegelin <email@hidden>
- Date: Thu, 19 Feb 2004 15:57:43 +1100
On Wednesday, February 18, 2004, at 05:00 PM,
email@hidden wrote:
I'm using the MusicPlayer API to play midi files and have a question
about changing the audio destination. Note that I am not using any
AUGraph functions - just the default. I have an external device that I
can detect with MIDIGetNumberOfDestinations and MIDIGetDestination.
When my player first starts up the midi sequence plays through the
built in synthesizer and I can change to the external device using
MusicSequenceSetMIDIEndpoint however I can't see a way to change the
destination back to the internal synthesizer. So could someone kindly
tell me:
How do you change the destination back to the internal sythesizer?
You have to have the sequence play to a graph (the sequence creates a
default graph with a MusicDevice AU in it (the DLS synth))... So, if
you set it to an endpoint, you'd have to reset it to a graph with a dls
synth.
I have found that to change the destination to the external device
while the sequence is playing, I have to Stop the MusicPlayer, set the
endpoint with MusicSequenceSetMIDIEndpoint, call MusicPlayerPreroll
and then start the Player again. Is this the correct way to do it?
Yes
On a related note is there any particular reason why the internal
synthesizer isn't counted in MIDIGetNumberOfDestinations? I get 1 (for
the external device) but I would have thought it would be 2 (external
and internal).
Its an Audio Unit, not a MIDI Endpoint
OK thanks! I think I've got it sort of working now. Part of the problem
was that I was referring to old documentation (CoreAudio.pdf ~c2000)
and I'm a complete newbie at this.
Peter
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