Re: Need a callback on the MusicPlayer
Re: Need a callback on the MusicPlayer
- Subject: Re: Need a callback on the MusicPlayer
- From: Bill Stewart <email@hidden>
- Date: Wed, 5 Mar 2003 23:13:58 -0800
Its coming...
There will be a way to instantiate a UserData callback on a given
sequence... If there, the scheduler will call your callback with every
user data event it finds - both in chasing and in playback - giving you
the sequence, track, start and end beats for what it is rendering
(these are tweaked in a different way so that you know when you're
chasing v playing), event time of the user event and of course the user
event itself.
Whilst chasing if you don't want these callbacks, you can just mute the
tracks that have these events in them
Bill
On Wednesday, March 5, 2003, at 11:06 PM, Philippe Wicker wrote:
Hi all,
This is a question/suggestion to the CoreAudio/CoreMIDI team.
When playing a sequence with the MusicPlayer, it is today possible to
direct MIDI events - on a per track basis - either to an AU or to a
MIDIEndpoint. These 2 methods involves "items" which are "public", I
mean accessible by any CoreAudio compliant application. There are
situations where you may not want your MIDI destination to be public.
To give a real case: I'd like to use the MusicPlayer to control the
playback of audio tracks. I could implement this as a MusicDevice. I
don't like this solution because 1) the AU is "public", 2) I just need
a very limited subset of the AU features to playback my audio track. I
could redirect the MIDI events to a MIDIEndpoint and do my own job in
the MIDIReadProc. I don't like it too, because the endpoint is public
and may receive events from any sources in the system.
A good solution, in my opinion, would be to add a third MIDI events
destination for a MusicPlayer track. We could pass a callback that
would be called by the MusicPlayer when MIDI events are to be played
from a track. The API could be something like
MusicTrackSetDestCallback(track, callback). This would be a very
flexible solution.
What's your feeling about this?
Philippe Wicker
email@hidden
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