1 #include "midi_mapper.h"
3 #include <alsa/asoundlib.h>
7 #include <google/protobuf/descriptor.h>
8 #include <google/protobuf/io/zero_copy_stream_impl.h>
9 #include <google/protobuf/message.h>
10 #include <google/protobuf/text_format.h>
14 #include <sys/eventfd.h>
20 #include "audio_mixer.h"
21 #include "midi_mapping.pb.h"
23 using namespace google::protobuf;
25 using namespace std::placeholders;
29 double map_controller_to_float(int val)
31 // Slightly hackish mapping so that we can represent exactly 0.0, 0.5 and 1.0.
34 } else if (val >= 127) {
37 return (val + 0.5) / 127.0;
43 MIDIMapper::MIDIMapper(ControllerReceiver *receiver)
44 : receiver(receiver), mapping_proto(new MIDIMappingProto)
46 should_quit_fd = eventfd(/*initval=*/0, /*flags=*/0);
47 assert(should_quit_fd != -1);
50 MIDIMapper::~MIDIMapper()
53 const uint64_t one = 1;
54 if (write(should_quit_fd, &one, sizeof(one)) != sizeof(one)) {
55 perror("write(should_quit_fd)");
59 close(should_quit_fd);
62 bool load_midi_mapping_from_file(const string &filename, MIDIMappingProto *new_mapping)
64 // Read and parse the protobuf from disk.
65 int fd = open(filename.c_str(), O_RDONLY);
67 perror(filename.c_str());
70 io::FileInputStream input(fd); // Takes ownership of fd.
71 if (!TextFormat::Parse(&input, new_mapping)) {
79 bool save_midi_mapping_to_file(const MIDIMappingProto &mapping_proto, const string &filename)
81 // Save to disk. We use the text format because it's friendlier
82 // for a user to look at and edit.
83 int fd = open(filename.c_str(), O_WRONLY | O_TRUNC | O_CREAT, 0666);
85 perror(filename.c_str());
88 io::FileOutputStream output(fd); // Takes ownership of fd.
89 if (!TextFormat::Print(mapping_proto, &output)) {
90 // TODO: Don't overwrite the old file (if any) on error.
99 void MIDIMapper::set_midi_mapping(const MIDIMappingProto &new_mapping)
101 lock_guard<mutex> lock(mu);
103 mapping_proto->CopyFrom(new_mapping);
105 mapping_proto.reset(new MIDIMappingProto(new_mapping));
108 num_controller_banks = min(max(mapping_proto->num_controller_banks(), 1), 5);
109 current_controller_bank = 0;
111 receiver->clear_all_highlights();
115 void MIDIMapper::start_thread()
117 midi_thread = thread(&MIDIMapper::thread_func, this);
120 const MIDIMappingProto &MIDIMapper::get_current_mapping() const
122 lock_guard<mutex> lock(mu);
123 return *mapping_proto;
126 ControllerReceiver *MIDIMapper::set_receiver(ControllerReceiver *new_receiver)
128 lock_guard<mutex> lock(mu);
129 swap(receiver, new_receiver);
130 return new_receiver; // Now old receiver.
133 #define RETURN_ON_ERROR(msg, expr) do { \
136 fprintf(stderr, msg ": %s\n", snd_strerror(err)); \
141 #define WARN_ON_ERROR(msg, expr) do { \
144 fprintf(stderr, msg ": %s\n", snd_strerror(err)); \
149 void MIDIMapper::thread_func()
154 RETURN_ON_ERROR("snd_seq_open", snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX, 0));
155 RETURN_ON_ERROR("snd_seq_nonblock", snd_seq_nonblock(seq, 1));
156 RETURN_ON_ERROR("snd_seq_client_name", snd_seq_set_client_name(seq, "nageru"));
157 RETURN_ON_ERROR("snd_seq_create_simple_port",
158 snd_seq_create_simple_port(seq, "nageru",
159 SND_SEQ_PORT_CAP_READ |
160 SND_SEQ_PORT_CAP_SUBS_READ |
161 SND_SEQ_PORT_CAP_WRITE |
162 SND_SEQ_PORT_CAP_SUBS_WRITE,
163 SND_SEQ_PORT_TYPE_MIDI_GENERIC |
164 SND_SEQ_PORT_TYPE_APPLICATION));
166 int queue_id = snd_seq_alloc_queue(seq);
167 RETURN_ON_ERROR("snd_seq_create_queue", queue_id);
168 RETURN_ON_ERROR("snd_seq_start_queue", snd_seq_start_queue(seq, queue_id, nullptr));
170 // The sequencer object is now ready to be used from other threads.
172 lock_guard<mutex> lock(mu);
174 alsa_queue_id = queue_id;
177 // Listen to the announce port (0:1), which will tell us about new ports.
178 RETURN_ON_ERROR("snd_seq_connect_from", snd_seq_connect_from(seq, 0, /*client=*/0, /*port=*/1));
180 // Now go through all ports and subscribe to them.
181 snd_seq_client_info_t *cinfo;
182 snd_seq_client_info_alloca(&cinfo);
184 snd_seq_client_info_set_client(cinfo, -1);
185 while (snd_seq_query_next_client(seq, cinfo) >= 0) {
186 int client = snd_seq_client_info_get_client(cinfo);
188 snd_seq_port_info_t *pinfo;
189 snd_seq_port_info_alloca(&pinfo);
191 snd_seq_port_info_set_client(pinfo, client);
192 snd_seq_port_info_set_port(pinfo, -1);
193 while (snd_seq_query_next_port(seq, pinfo) >= 0) {
194 constexpr int mask = SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ;
195 if ((snd_seq_port_info_get_capability(pinfo) & mask) == mask) {
196 lock_guard<mutex> lock(mu);
197 subscribe_to_port_lock_held(seq, *snd_seq_port_info_get_addr(pinfo));
202 int num_alsa_fds = snd_seq_poll_descriptors_count(seq, POLLIN);
203 unique_ptr<pollfd[]> fds(new pollfd[num_alsa_fds + 1]);
205 while (!should_quit) {
206 snd_seq_poll_descriptors(seq, fds.get(), num_alsa_fds, POLLIN);
207 fds[num_alsa_fds].fd = should_quit_fd;
208 fds[num_alsa_fds].events = POLLIN;
209 fds[num_alsa_fds].revents = 0;
211 err = poll(fds.get(), num_alsa_fds + 1, -1);
212 if (err == 0 || (err == -1 && errno == EINTR)) {
219 if (fds[num_alsa_fds].revents) {
220 // Activity on should_quit_fd.
224 // Seemingly we can get multiple events in a single poll,
225 // and if we don't handle them all, poll will _not_ alert us!
226 while (!should_quit) {
227 snd_seq_event_t *event;
228 err = snd_seq_event_input(seq, &event);
230 if (err == -EINTR) continue;
231 if (err == -EAGAIN) break;
232 fprintf(stderr, "snd_seq_event_input: %s\n", snd_strerror(err));
236 handle_event(seq, event);
242 void MIDIMapper::handle_event(snd_seq_t *seq, snd_seq_event_t *event)
244 if (event->source.client == snd_seq_client_id(seq)) {
245 // Ignore events we sent out ourselves.
249 lock_guard<mutex> lock(mu);
250 switch (event->type) {
251 case SND_SEQ_EVENT_CONTROLLER: {
252 const int controller = event->data.control.param;
253 const float value = map_controller_to_float(event->data.control.value);
255 receiver->controller_changed(controller);
257 // Global controllers.
258 match_controller(controller, MIDIMappingBusProto::kLocutFieldNumber, MIDIMappingProto::kLocutBankFieldNumber,
259 value, bind(&ControllerReceiver::set_locut, receiver, _2));
260 match_controller(controller, MIDIMappingBusProto::kLimiterThresholdFieldNumber, MIDIMappingProto::kLimiterThresholdBankFieldNumber,
261 value, bind(&ControllerReceiver::set_limiter_threshold, receiver, _2));
262 match_controller(controller, MIDIMappingBusProto::kMakeupGainFieldNumber, MIDIMappingProto::kMakeupGainBankFieldNumber,
263 value, bind(&ControllerReceiver::set_makeup_gain, receiver, _2));
266 match_controller(controller, MIDIMappingBusProto::kTrebleFieldNumber, MIDIMappingProto::kTrebleBankFieldNumber,
267 value, bind(&ControllerReceiver::set_treble, receiver, _1, _2));
268 match_controller(controller, MIDIMappingBusProto::kMidFieldNumber, MIDIMappingProto::kMidBankFieldNumber,
269 value, bind(&ControllerReceiver::set_mid, receiver, _1, _2));
270 match_controller(controller, MIDIMappingBusProto::kBassFieldNumber, MIDIMappingProto::kBassBankFieldNumber,
271 value, bind(&ControllerReceiver::set_bass, receiver, _1, _2));
272 match_controller(controller, MIDIMappingBusProto::kGainFieldNumber, MIDIMappingProto::kGainBankFieldNumber,
273 value, bind(&ControllerReceiver::set_gain, receiver, _1, _2));
274 match_controller(controller, MIDIMappingBusProto::kCompressorThresholdFieldNumber, MIDIMappingProto::kCompressorThresholdBankFieldNumber,
275 value, bind(&ControllerReceiver::set_compressor_threshold, receiver, _1, _2));
276 match_controller(controller, MIDIMappingBusProto::kFaderFieldNumber, MIDIMappingProto::kFaderBankFieldNumber,
277 value, bind(&ControllerReceiver::set_fader, receiver, _1, _2));
280 case SND_SEQ_EVENT_NOTEON: {
281 const int note = event->data.note.note;
283 receiver->note_on(note);
285 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
286 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
287 if (bus_mapping.has_prev_bank() &&
288 bus_mapping.prev_bank().note_number() == note) {
289 current_controller_bank = (current_controller_bank + num_controller_banks - 1) % num_controller_banks;
291 update_lights_lock_held();
293 if (bus_mapping.has_next_bank() &&
294 bus_mapping.next_bank().note_number() == note) {
295 current_controller_bank = (current_controller_bank + 1) % num_controller_banks;
297 update_lights_lock_held();
299 if (bus_mapping.has_select_bank_1() &&
300 bus_mapping.select_bank_1().note_number() == note) {
301 current_controller_bank = 0;
303 update_lights_lock_held();
305 if (bus_mapping.has_select_bank_2() &&
306 bus_mapping.select_bank_2().note_number() == note &&
307 num_controller_banks >= 2) {
308 current_controller_bank = 1;
310 update_lights_lock_held();
312 if (bus_mapping.has_select_bank_3() &&
313 bus_mapping.select_bank_3().note_number() == note &&
314 num_controller_banks >= 3) {
315 current_controller_bank = 2;
317 update_lights_lock_held();
319 if (bus_mapping.has_select_bank_4() &&
320 bus_mapping.select_bank_4().note_number() == note &&
321 num_controller_banks >= 4) {
322 current_controller_bank = 3;
324 update_lights_lock_held();
326 if (bus_mapping.has_select_bank_5() &&
327 bus_mapping.select_bank_5().note_number() == note &&
328 num_controller_banks >= 5) {
329 current_controller_bank = 4;
331 update_lights_lock_held();
335 match_button(note, MIDIMappingBusProto::kToggleLocutFieldNumber, MIDIMappingProto::kToggleLocutBankFieldNumber,
336 bind(&ControllerReceiver::toggle_locut, receiver, _1));
337 match_button(note, MIDIMappingBusProto::kToggleAutoGainStagingFieldNumber, MIDIMappingProto::kToggleAutoGainStagingBankFieldNumber,
338 bind(&ControllerReceiver::toggle_auto_gain_staging, receiver, _1));
339 match_button(note, MIDIMappingBusProto::kToggleCompressorFieldNumber, MIDIMappingProto::kToggleCompressorBankFieldNumber,
340 bind(&ControllerReceiver::toggle_compressor, receiver, _1));
341 match_button(note, MIDIMappingBusProto::kClearPeakFieldNumber, MIDIMappingProto::kClearPeakBankFieldNumber,
342 bind(&ControllerReceiver::clear_peak, receiver, _1));
343 match_button(note, MIDIMappingBusProto::kToggleMuteFieldNumber, MIDIMappingProto::kClearPeakBankFieldNumber,
344 bind(&ControllerReceiver::toggle_mute, receiver, _1));
345 match_button(note, MIDIMappingBusProto::kToggleLimiterFieldNumber, MIDIMappingProto::kToggleLimiterBankFieldNumber,
346 bind(&ControllerReceiver::toggle_limiter, receiver));
347 match_button(note, MIDIMappingBusProto::kToggleAutoMakeupGainFieldNumber, MIDIMappingProto::kToggleAutoMakeupGainBankFieldNumber,
348 bind(&ControllerReceiver::toggle_auto_makeup_gain, receiver));
351 case SND_SEQ_EVENT_PORT_START:
352 subscribe_to_port_lock_held(seq, event->data.addr);
354 case SND_SEQ_EVENT_PORT_EXIT:
355 printf("MIDI port %d:%d went away.\n", event->data.addr.client, event->data.addr.port);
357 case SND_SEQ_EVENT_PORT_SUBSCRIBED:
358 if (event->data.connect.sender.client != 0 && // Ignore system senders.
359 event->data.connect.sender.client != snd_seq_client_id(seq) &&
360 event->data.connect.dest.client == snd_seq_client_id(seq)) {
361 ++num_subscribed_ports;
365 case SND_SEQ_EVENT_PORT_UNSUBSCRIBED:
366 if (event->data.connect.sender.client != 0 && // Ignore system senders.
367 event->data.connect.sender.client != snd_seq_client_id(seq) &&
368 event->data.connect.dest.client == snd_seq_client_id(seq)) {
369 --num_subscribed_ports;
373 case SND_SEQ_EVENT_NOTEOFF:
374 case SND_SEQ_EVENT_CLIENT_START:
375 case SND_SEQ_EVENT_CLIENT_EXIT:
376 case SND_SEQ_EVENT_CLIENT_CHANGE:
377 case SND_SEQ_EVENT_PORT_CHANGE:
380 printf("Ignoring MIDI event of unknown type %d.\n", event->type);
384 void MIDIMapper::subscribe_to_port_lock_held(snd_seq_t *seq, const snd_seq_addr_t &addr)
386 // Client 0 is basically the system; ignore it.
387 if (addr.client == 0) {
391 int err = snd_seq_connect_from(seq, 0, addr.client, addr.port);
393 // Just print out a warning (i.e., don't die); it could
394 // very well just be e.g. another application.
395 printf("Couldn't subscribe to MIDI port %d:%d (%s).\n",
396 addr.client, addr.port, snd_strerror(err));
398 printf("Subscribed to MIDI port %d:%d.\n", addr.client, addr.port);
401 // For sending data back.
402 err = snd_seq_connect_to(seq, 0, addr.client, addr.port);
404 printf("Couldn't subscribe MIDI port %d:%d (%s) to us.\n",
405 addr.client, addr.port, snd_strerror(err));
407 printf("Subscribed MIDI port %d:%d to us.\n", addr.client, addr.port);
410 current_light_status.clear(); // The current state of the device is unknown.
411 update_lights_lock_held();
414 void MIDIMapper::match_controller(int controller, int field_number, int bank_field_number, float value, function<void(unsigned, float)> func)
416 if (bank_mismatch(bank_field_number)) {
420 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
421 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
423 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
424 const Reflection *bus_reflection = bus_mapping.GetReflection();
425 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
428 const MIDIControllerProto &controller_proto =
429 static_cast<const MIDIControllerProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
430 if (controller_proto.controller_number() == controller) {
431 func(bus_idx, value);
436 void MIDIMapper::match_button(int note, int field_number, int bank_field_number, function<void(unsigned)> func)
438 if (bank_mismatch(bank_field_number)) {
442 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
443 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
445 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
446 const Reflection *bus_reflection = bus_mapping.GetReflection();
447 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
450 const MIDIButtonProto &button_proto =
451 static_cast<const MIDIButtonProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
452 if (button_proto.note_number() == note) {
458 bool MIDIMapper::has_active_controller(unsigned bus_idx, int field_number, int bank_field_number)
460 if (bank_mismatch(bank_field_number)) {
464 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
465 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
466 const Reflection *bus_reflection = bus_mapping.GetReflection();
467 return bus_reflection->HasField(bus_mapping, descriptor);
470 bool MIDIMapper::bank_mismatch(int bank_field_number)
472 const FieldDescriptor *bank_descriptor = mapping_proto->GetDescriptor()->FindFieldByNumber(bank_field_number);
473 const Reflection *reflection = mapping_proto->GetReflection();
474 return (reflection->HasField(*mapping_proto, bank_descriptor) &&
475 reflection->GetInt32(*mapping_proto, bank_descriptor) != current_controller_bank);
478 void MIDIMapper::refresh_highlights()
480 receiver->clear_all_highlights();
484 void MIDIMapper::refresh_lights()
486 lock_guard<mutex> lock(mu);
487 update_lights_lock_held();
490 void MIDIMapper::update_highlights()
492 if (num_subscribed_ports.load() == 0) {
493 receiver->clear_all_highlights();
497 // Global controllers.
498 bool highlight_locut = false;
499 bool highlight_limiter_threshold = false;
500 bool highlight_makeup_gain = false;
501 bool highlight_toggle_limiter = false;
502 bool highlight_toggle_auto_makeup_gain = false;
503 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
504 if (has_active_controller(
505 bus_idx, MIDIMappingBusProto::kLocutFieldNumber, MIDIMappingProto::kLocutBankFieldNumber)) {
506 highlight_locut = true;
508 if (has_active_controller(
509 bus_idx, MIDIMappingBusProto::kLimiterThresholdFieldNumber, MIDIMappingProto::kLimiterThresholdBankFieldNumber)) {
510 highlight_limiter_threshold = true;
512 if (has_active_controller(
513 bus_idx, MIDIMappingBusProto::kMakeupGainFieldNumber, MIDIMappingProto::kMakeupGainBankFieldNumber)) {
514 highlight_makeup_gain = true;
516 if (has_active_controller(
517 bus_idx, MIDIMappingBusProto::kToggleLimiterFieldNumber, MIDIMappingProto::kToggleLimiterBankFieldNumber)) {
518 highlight_toggle_limiter = true;
520 if (has_active_controller(
521 bus_idx, MIDIMappingBusProto::kToggleAutoMakeupGainFieldNumber, MIDIMappingProto::kToggleAutoMakeupGainBankFieldNumber)) {
522 highlight_toggle_auto_makeup_gain = true;
525 receiver->highlight_locut(highlight_locut);
526 receiver->highlight_limiter_threshold(highlight_limiter_threshold);
527 receiver->highlight_makeup_gain(highlight_makeup_gain);
528 receiver->highlight_toggle_limiter(highlight_toggle_limiter);
529 receiver->highlight_toggle_auto_makeup_gain(highlight_toggle_auto_makeup_gain);
531 // Per-bus controllers.
532 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
533 receiver->highlight_treble(bus_idx, has_active_controller(
534 bus_idx, MIDIMappingBusProto::kTrebleFieldNumber, MIDIMappingProto::kTrebleBankFieldNumber));
535 receiver->highlight_mid(bus_idx, has_active_controller(
536 bus_idx, MIDIMappingBusProto::kMidFieldNumber, MIDIMappingProto::kMidBankFieldNumber));
537 receiver->highlight_bass(bus_idx, has_active_controller(
538 bus_idx, MIDIMappingBusProto::kBassFieldNumber, MIDIMappingProto::kBassBankFieldNumber));
539 receiver->highlight_gain(bus_idx, has_active_controller(
540 bus_idx, MIDIMappingBusProto::kGainFieldNumber, MIDIMappingProto::kGainBankFieldNumber));
541 receiver->highlight_compressor_threshold(bus_idx, has_active_controller(
542 bus_idx, MIDIMappingBusProto::kCompressorThresholdFieldNumber, MIDIMappingProto::kCompressorThresholdBankFieldNumber));
543 receiver->highlight_fader(bus_idx, has_active_controller(
544 bus_idx, MIDIMappingBusProto::kFaderFieldNumber, MIDIMappingProto::kFaderBankFieldNumber));
545 receiver->highlight_mute(bus_idx, has_active_controller(
546 bus_idx, MIDIMappingBusProto::kToggleMuteFieldNumber, MIDIMappingProto::kToggleMuteBankFieldNumber));
547 receiver->highlight_toggle_locut(bus_idx, has_active_controller(
548 bus_idx, MIDIMappingBusProto::kToggleLocutFieldNumber, MIDIMappingProto::kToggleLocutBankFieldNumber));
549 receiver->highlight_toggle_auto_gain_staging(bus_idx, has_active_controller(
550 bus_idx, MIDIMappingBusProto::kToggleAutoGainStagingFieldNumber, MIDIMappingProto::kToggleAutoGainStagingBankFieldNumber));
551 receiver->highlight_toggle_compressor(bus_idx, has_active_controller(
552 bus_idx, MIDIMappingBusProto::kToggleCompressorFieldNumber, MIDIMappingProto::kToggleCompressorBankFieldNumber));
556 void MIDIMapper::update_lights_lock_held()
558 if (alsa_seq == nullptr || global_audio_mixer == nullptr) {
562 set<unsigned> active_lights; // Desired state.
563 if (current_controller_bank == 0) {
564 activate_lights_all_buses(MIDIMappingBusProto::kBank1IsSelectedFieldNumber, &active_lights);
566 if (current_controller_bank == 1) {
567 activate_lights_all_buses(MIDIMappingBusProto::kBank2IsSelectedFieldNumber, &active_lights);
569 if (current_controller_bank == 2) {
570 activate_lights_all_buses(MIDIMappingBusProto::kBank3IsSelectedFieldNumber, &active_lights);
572 if (current_controller_bank == 3) {
573 activate_lights_all_buses(MIDIMappingBusProto::kBank4IsSelectedFieldNumber, &active_lights);
575 if (current_controller_bank == 4) {
576 activate_lights_all_buses(MIDIMappingBusProto::kBank5IsSelectedFieldNumber, &active_lights);
578 if (global_audio_mixer->get_limiter_enabled()) {
579 activate_lights_all_buses(MIDIMappingBusProto::kLimiterIsOnFieldNumber, &active_lights);
581 if (global_audio_mixer->get_final_makeup_gain_auto()) {
582 activate_lights_all_buses(MIDIMappingBusProto::kAutoMakeupGainIsOnFieldNumber, &active_lights);
584 unsigned num_buses = min<unsigned>(global_audio_mixer->num_buses(), mapping_proto->bus_mapping_size());
585 for (unsigned bus_idx = 0; bus_idx < num_buses; ++bus_idx) {
586 if (global_audio_mixer->get_mute(bus_idx)) {
587 activate_lights(bus_idx, MIDIMappingBusProto::kIsMutedFieldNumber, &active_lights);
589 if (global_audio_mixer->get_locut_enabled(bus_idx)) {
590 activate_lights(bus_idx, MIDIMappingBusProto::kLocutIsOnFieldNumber, &active_lights);
592 if (global_audio_mixer->get_gain_staging_auto(bus_idx)) {
593 activate_lights(bus_idx, MIDIMappingBusProto::kAutoGainStagingIsOnFieldNumber, &active_lights);
595 if (global_audio_mixer->get_compressor_enabled(bus_idx)) {
596 activate_lights(bus_idx, MIDIMappingBusProto::kCompressorIsOnFieldNumber, &active_lights);
598 if (has_peaked[bus_idx]) {
599 activate_lights(bus_idx, MIDIMappingBusProto::kHasPeakedFieldNumber, &active_lights);
603 unsigned num_events = 0;
604 for (unsigned note_num = 1; note_num <= 127; ++note_num) {
605 bool active = active_lights.count(note_num);
606 if (current_light_status.count(note_num) &&
607 current_light_status[note_num] == active) {
608 // Already known to be in the desired state.
613 snd_seq_ev_clear(&ev);
615 // Some devices drop events if we throw them onto them
616 // too quickly. Add a 1 ms delay for each.
617 snd_seq_real_time_t tm{0, num_events++ * 1000000};
618 snd_seq_ev_schedule_real(&ev, alsa_queue_id, true, &tm);
619 snd_seq_ev_set_source(&ev, 0);
620 snd_seq_ev_set_subs(&ev);
622 // For some reason, not all devices respond to note off.
623 // Use note-on with velocity of 0 (which is equivalent) instead.
624 snd_seq_ev_set_noteon(&ev, /*channel=*/0, note_num, active ? 127 : 0);
625 WARN_ON_ERROR("snd_seq_event_output", snd_seq_event_output(alsa_seq, &ev));
626 current_light_status[note_num] = active;
628 WARN_ON_ERROR("snd_seq_drain_output", snd_seq_drain_output(alsa_seq));
631 void MIDIMapper::activate_lights(unsigned bus_idx, int field_number, set<unsigned> *active_lights)
633 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
635 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
636 const Reflection *bus_reflection = bus_mapping.GetReflection();
637 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
640 const MIDILightProto &light_proto =
641 static_cast<const MIDILightProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
642 active_lights->insert(light_proto.note_number());
645 void MIDIMapper::activate_lights_all_buses(int field_number, set<unsigned> *active_lights)
647 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
648 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
650 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
651 const Reflection *bus_reflection = bus_mapping.GetReflection();
652 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
655 const MIDILightProto &light_proto =
656 static_cast<const MIDILightProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
657 active_lights->insert(light_proto.note_number());