[fluid-dev] Midi track functions

[David Henningsson]

There seems to have been a few requests lately about midi tracks and 
being able to read more of midi events. What do you think of the 
following outline, would that fulfil your wishes?

 * Let's add a midi event type named "MIDI_META" or similar. We use it 
to store all meta events we don't store currently. We'll dump the varlen 
of copyright, lyrics, etc in there - just like we do for sysex.

 * We'll also add another callback to fluid_track_send_events, with 
more info in it. Preferrably here:

        track->ticks += event->dtime;

        /* Add callback here */

        if (!player || event->type == MIDI_EOT) {

The callback function could look like:

int handle_extended_playback_event(int track_index, const char* 
track_name, unsigned int ticks, fluid_midi_event_t* event, void* userdata)

(Is there more stuff we need?)

The callback can modify the current event if necessary, and could return 
FLUID_OK for fluidsynth to continue to process the event, or 
FLUID_FAILED to ignore the current event.

If we like, we could also add the same type of callback at parsing time 
(I think Pedro suggested something like this a while ago?) for players 
to be able to pick up lyric information etc ahead of time, which could 
be useful for some midi players.

What do you think?

// David