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https://github.com/ZDoom/fluidsynth.git
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77 lines
2.9 KiB
Text
77 lines
2.9 KiB
Text
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/*!
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\page MIDIRouter Real-time MIDI router
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The MIDI router is one more processing layer directly behind the MIDI input.
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It processes incoming MIDI events and generates control events for the synth.
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It can be used to filter or modify events prior to sending them to the
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synthesizer. When created, the MIDI router is transparent and simply passes
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all MIDI events. Router "rules" must be added to actually make use of its
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capabilities.
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Some examples of MIDI router usage:
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- Filter messages (Example: Pass sustain pedal CCs only to selected channels)
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- Split the keyboard (Example: noteon with notenr < x: to ch 1, >x to ch 2)
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- Layer sounds (Example: for each noteon received on ch 1, create a noteon on
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ch1, ch2, ch3,...)
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- Velocity scaling (Example: for each noteon event, scale the velocity by
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1.27)
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- Velocity switching (Example: v <= 100: "Angel Choir"; v > 100: "Hell's
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Bells")
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- Get rid of aftertouch
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The MIDI driver API has a clean separation between the midi thread and the
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synthesizer. That opens the door to add a midi router module.
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MIDI events coming from the MIDI player do not pass through the MIDI router.
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\code
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#include <fluidsynth.h>
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int main(int argc, char** argv)
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{
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fluid_settings_t* settings;
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fluid_synth_t* synth;
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fluid_midi_router_t* router;
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fluid_midi_router_rule_t* rule;
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settings = new_fluid_settings();
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synth = new_fluid_synth(settings);
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/* Create the MIDI router and pass events to the synthesizer */
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router = new_fluid_midi_router (settings, fluid_synth_handle_midi_event, synth);
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/* Clear default rules */
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fluid_midi_router_clear_rules (router);
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/* Add rule to map all notes < MIDI note #60 on any channel to channel 4 */
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rule = new_fluid_midi_router_rule ();
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fluid_midi_router_rule_set_chan (rule, 0, 15, 0.0, 4); /* Map all to channel 4 */
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fluid_midi_router_rule_set_param1 (rule, 0, 59, 1.0, 0); /* Match notes < 60 */
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fluid_midi_router_add_rule (router, rule, FLUID_MIDI_ROUTER_RULE_NOTE);
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/* Add rule to map all notes >= MIDI note #60 on any channel to channel 5 */
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rule = new_fluid_midi_router_rule ();
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fluid_midi_router_rule_set_chan (rule, 0, 15, 0.0, 5); /* Map all to channel 5 */
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fluid_midi_router_rule_set_param1 (rule, 60, 127, 1.0, 0); /* Match notes >= 60 */
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fluid_midi_router_add_rule (router, rule, FLUID_MIDI_ROUTER_RULE_NOTE);
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/* Add rule to reverse direction of pitch bender on channel 7 */
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rule = new_fluid_midi_router_rule ();
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fluid_midi_router_rule_set_chan (rule, 7, 7, 1.0, 0); /* Match channel 7 only */
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fluid_midi_router_rule_set_param1 (rule, 0, 16383, -1.0, 16383); /* Reverse pitch bender */
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fluid_midi_router_add_rule (router, rule, FLUID_MIDI_ROUTER_RULE_PITCH_BEND);
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/* ... Create audio driver, process events, etc ... */
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/* cleanup */
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delete_fluid_midi_router(router);
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delete_fluid_synth(synth);
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delete_fluid_settings(settings);
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return 0;
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}
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\endcode
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*/
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