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Add playback callback from the MIDI file player for intercepting MIDI data on playback.

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Credits to Jason Vasquez, plcl etc for patch draft and discussion.
This commit is contained in:
David Henningsson 2011-05-22 09:03:39 +00:00
parent 60c6ec5168
commit 13a9e2a789
3 changed files with 31 additions and 2 deletions
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1
fluidsynth/include/fluidsynth/midi.h
View file

@ -132,6 +132,7 @@ FLUIDSYNTH_API int fluid_player_set_loop(fluid_player_t* player, int loop);
FLUIDSYNTH_API int fluid_player_set_midi_tempo(fluid_player_t* player, int tempo);
FLUIDSYNTH_API int fluid_player_set_bpm(fluid_player_t* player, int bpm);
FLUIDSYNTH_API int fluid_player_get_status(fluid_player_t* player);
FLUIDSYNTH_API int fluid_player_set_playback_callback(fluid_player_t* player, handle_midi_event_func_t handler, void* handler_data);
#ifdef __cplusplus
}

29
fluidsynth/src/midi/fluid_midi.c
View file

@ -1204,8 +1204,10 @@ fluid_track_send_events(fluid_track_t *track,
track->ticks += event->dtime;
if (event->type != MIDI_SET_TEMPO)
fluid_synth_handle_midi_event(synth, event);
if (event->type != MIDI_SET_TEMPO) {
if (player->playback_callback)
player->playback_callback(player->playback_userdata, event);
}
else if (player)
fluid_player_set_midi_tempo(player, event->param1);
@ -1252,6 +1254,7 @@ new_fluid_player(fluid_synth_t *synth)
player->deltatime = 4.0;
player->cur_msec = 0;
player->cur_ticks = 0;
fluid_player_set_playback_callback(player, fluid_synth_handle_midi_event, synth);
player->use_system_timer = fluid_settings_str_equal(synth->settings,
"player.timing-source", "system");
@ -1370,6 +1373,28 @@ fluid_player_get_track(fluid_player_t *player, int i)
}
}
/**
* Change the MIDI callback function. This is usually set to
* fluid_synth_handle_midi_event, but can optionally be changed
* to a user-defined function instead, for intercepting all MIDI
* messages sent to the synth. You can also use a midi router as
* the callback function to modify the MIDI messages before sending
* them to the synth.
* @param player MIDI player instance
* @param handler Pointer to callback function
* @param handler_data Parameter sent to the callback function
* @returns FLUID_OK
* @since 1.1.4
*/
int
fluid_player_set_playback_callback(fluid_player_t* player,
handle_midi_event_func_t handler, void* handler_data)
{
player->playback_callback = handler;
player->playback_userdata = handler_data;
return FLUID_OK;
}
/**
* Add a MIDI file to a player queue.
* @param player MIDI player instance

3
fluidsynth/src/midi/fluid_midi.h
View file

@ -304,6 +304,9 @@ struct _fluid_player_t {
int miditempo; /* as indicated by MIDI SetTempo: n 24th of a usec per midi-clock. bravo! */
double deltatime; /* milliseconds per midi tick. depends on set-tempo */
unsigned int division;
handle_midi_event_func_t playback_callback; /* function fired on each midi event as it is played */
void* playback_userdata; /* pointer to user-defined data passed to playback_callback function */
};
int fluid_player_add_track(fluid_player_t* player, fluid_track_t* track);