play multi-instrument MIDI file

Question

I have been working with the MusicPlayer and MusicSequence classes to play MIDI files. However, I am wondering how to specify instruments for different channels. What is the MusicPlayer's default response to program change events? Can I tell the MusicPlayer to use certain samplers for certain channels? Or is the only way to set my own function as a MIDI Endpoint, and then handle the playing of notes myself using MusicDeviceMIDIEvent() to specify the sampler?

Answer 1

You can specify different instruments for different tracks in a MusicSequence. (MusicTrack API) I don't think MusicPlayer does anything with channels per se. You can specify that channels be converted to tracks when loading a MIDI file.

Music Sequence Load Flags

Flags used to configure the behavior of the MusicSequenceFileLoad and MusicSequenceFileLoadData functions.

enum { kMusicSequenceLoadSMF_ChannelsToTracks = (1 << 0) }; typedef UInt32 MusicSequenceLoadFlags;

Constants

kMusicSequenceLoadSMF_ChannelsToTracks

If this flag is set the resultant Sequence will contain a tempo track, 1 track for each MIDI Channel that is found in the SMF, 1 track

for SysEx or MetaEvents - and this will be the last track in the sequence after the LoadSMFWithFlags calls.

Available in OS X v10.3 and later.

Declared in MusicPlayer.h.