Implements zynthian/zynthian-issue-tracking#1473: Mechanism to unroute from zmops a set of zmip's MIDI channels (ui_midi_channels).

This is used by some ctrldev drivers.

Author: jofemodo

zynmidirouter.c

@@ -375,6 +375,7 @@ int zmip_init(int iz, char *name, uint32_t flags) {
 	zmips[iz].event.time = 0xFFFFFFFF;
 	zmips[iz].event_count = 0;
 	zmips[iz].flags = flags;
+	zmips[iz].ui_midi_chans = 0;
 	memset(zmips[iz].last_ctrl_val, 0, 16 * 128);
 
 	// Create direct input ring-buffer
@@ -516,6 +517,24 @@ int zmip_get_flag_system_rt(int iz) {
 	return zmips[ZMIP_DEV0 + iz].flags & (uint32_t)FLAG_ZMIP_SYSTEM_RT;
 }
 
+// MIDI chans reserved for UI
+int zmip_set_ui_midi_chans(int iz, uint16_t ui_midi_chans) {
+	if (iz < 0 || iz >= MAX_NUM_ZMIPS) {
+		fprintf(stderr, "ZynMidiRouter: Bad input port index (%d).\n", iz);
+		return 0;
+	}
+	zmips[iz].ui_midi_chans = ui_midi_chans;
+	return 1;
+}
+
+uint16_t zmip_get_ui_midi_chans(int iz) {
+	if (iz < 0 || iz >= MAX_NUM_ZMIPS) {
+		fprintf(stderr, "ZynMidiRouter: Bad input port index (%d).\n", iz);
+		return 0;
+	}
+	return zmips[iz].ui_midi_chans;
+}
+
 //Route/unroute a MIDI input device (zmip) to *ALL* chain zmops
 int zmip_set_route_chains(int iz, int route) {
 	if (iz < 0 || iz >= MAX_NUM_ZMIPS) {
@@ -1495,6 +1514,8 @@ int jack_process(jack_nframes_t nframes, void *arg) {
 				}
 			} else {
 				write_zynmidi((event_idev << 24) | (ev->buffer[0] << 16) | (ev->buffer[1] << 8) | (ev->buffer[2]));
+				// MIDI chans reserved for UI => Don't route to zmops!
+				if (event_type < SYSTEM_EXCLUSIVE && ((zmip->ui_midi_chans >> event_chan) & 0x1)) goto event_processed;
 			}
 		}
 
@@ -1614,6 +1635,7 @@ int jack_process(jack_nframes_t nframes, void *arg) {
 					pedal_sent[pedal] |= (1 << izmop);
 				else
 					pedal_sent[pedal] &= ~(1 << izmop);
+
 			// Add processed event to MIDI output port buffer
 			zmop_push_event(zmop, ev);
 

zynmidirouter.h

@@ -194,6 +194,7 @@ struct zmip_st {
 	jack_ringbuffer_t * rbuffer;	// Direct input ring buffer => Used when DIRECTIN flag is set
 
 	uint32_t flags;					// Bitwise flags influencing input behaviour
+	uint16_t ui_midi_chans;			// Bitwise maks of MIDI channels reserved for UI (not routed to zmops!)
 
 	uint32_t event_count;			// Quantity of events in input event queue (not fake queues)
 	uint32_t next_event;			// Index of the next event to be processed (not fake queues)
@@ -222,6 +223,10 @@ int zmip_get_flag_system(int iz);
 int zmip_set_flag_system_rt(int iz, uint8_t flag);
 int zmip_get_flag_system_rt(int iz);
 
+// MIDI chans reserved for UI
+int zmip_set_ui_midi_chans(int iz, uint16_t ui_midi_chans);
+uint16_t zmip_get_ui_midi_chans(int iz);
+
 // Routing
 int zmip_set_route_chains(int iz, int route);			// Route/un-route a MIDI input port (zmip) to/from *ALL* zmop chains