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 write(should_quit_fd, &one, sizeof(one));
56 close(should_quit_fd);
59 bool load_midi_mapping_from_file(const string &filename, MIDIMappingProto *new_mapping)
61 // Read and parse the protobuf from disk.
62 int fd = open(filename.c_str(), O_RDONLY);
64 perror(filename.c_str());
67 io::FileInputStream input(fd); // Takes ownership of fd.
68 if (!TextFormat::Parse(&input, new_mapping)) {
76 bool save_midi_mapping_to_file(const MIDIMappingProto &mapping_proto, const string &filename)
78 // Save to disk. We use the text format because it's friendlier
79 // for a user to look at and edit.
80 int fd = open(filename.c_str(), O_WRONLY | O_TRUNC | O_CREAT, 0666);
82 perror(filename.c_str());
85 io::FileOutputStream output(fd); // Takes ownership of fd.
86 if (!TextFormat::Print(mapping_proto, &output)) {
87 // TODO: Don't overwrite the old file (if any) on error.
96 void MIDIMapper::set_midi_mapping(const MIDIMappingProto &new_mapping)
98 lock_guard<mutex> lock(mu);
100 mapping_proto->CopyFrom(new_mapping);
102 mapping_proto.reset(new MIDIMappingProto(new_mapping));
105 num_controller_banks = min(max(mapping_proto->num_controller_banks(), 1), 5);
106 current_controller_bank = 0;
108 receiver->clear_all_highlights();
112 void MIDIMapper::start_thread()
114 midi_thread = thread(&MIDIMapper::thread_func, this);
117 const MIDIMappingProto &MIDIMapper::get_current_mapping() const
119 lock_guard<mutex> lock(mu);
120 return *mapping_proto;
123 ControllerReceiver *MIDIMapper::set_receiver(ControllerReceiver *new_receiver)
125 lock_guard<mutex> lock(mu);
126 swap(receiver, new_receiver);
127 return new_receiver; // Now old receiver.
130 #define RETURN_ON_ERROR(msg, expr) do { \
133 fprintf(stderr, msg ": %s\n", snd_strerror(err)); \
138 #define WARN_ON_ERROR(msg, expr) do { \
141 fprintf(stderr, msg ": %s\n", snd_strerror(err)); \
146 void MIDIMapper::thread_func()
151 RETURN_ON_ERROR("snd_seq_open", snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX, 0));
152 RETURN_ON_ERROR("snd_seq_nonblock", snd_seq_nonblock(seq, 1));
153 RETURN_ON_ERROR("snd_seq_client_name", snd_seq_set_client_name(seq, "nageru"));
154 RETURN_ON_ERROR("snd_seq_create_simple_port",
155 snd_seq_create_simple_port(seq, "nageru",
156 SND_SEQ_PORT_CAP_READ |
157 SND_SEQ_PORT_CAP_SUBS_READ |
158 SND_SEQ_PORT_CAP_WRITE |
159 SND_SEQ_PORT_CAP_SUBS_WRITE,
160 SND_SEQ_PORT_TYPE_MIDI_GENERIC |
161 SND_SEQ_PORT_TYPE_APPLICATION));
163 int queue_id = snd_seq_alloc_queue(seq);
164 RETURN_ON_ERROR("snd_seq_create_queue", queue_id);
165 RETURN_ON_ERROR("snd_seq_start_queue", snd_seq_start_queue(seq, queue_id, nullptr));
167 // The sequencer object is now ready to be used from other threads.
169 lock_guard<mutex> lock(mu);
171 alsa_queue_id = queue_id;
174 // Listen to the announce port (0:1), which will tell us about new ports.
175 RETURN_ON_ERROR("snd_seq_connect_from", snd_seq_connect_from(seq, 0, /*client=*/0, /*port=*/1));
177 // Now go through all ports and subscribe to them.
178 snd_seq_client_info_t *cinfo;
179 snd_seq_client_info_alloca(&cinfo);
181 snd_seq_client_info_set_client(cinfo, -1);
182 while (snd_seq_query_next_client(seq, cinfo) >= 0) {
183 int client = snd_seq_client_info_get_client(cinfo);
185 snd_seq_port_info_t *pinfo;
186 snd_seq_port_info_alloca(&pinfo);
188 snd_seq_port_info_set_client(pinfo, client);
189 snd_seq_port_info_set_port(pinfo, -1);
190 while (snd_seq_query_next_port(seq, pinfo) >= 0) {
191 constexpr int mask = SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ;
192 if ((snd_seq_port_info_get_capability(pinfo) & mask) == mask) {
193 lock_guard<mutex> lock(mu);
194 subscribe_to_port_lock_held(seq, *snd_seq_port_info_get_addr(pinfo));
199 int num_alsa_fds = snd_seq_poll_descriptors_count(seq, POLLIN);
200 unique_ptr<pollfd[]> fds(new pollfd[num_alsa_fds + 1]);
202 while (!should_quit) {
203 snd_seq_poll_descriptors(seq, fds.get(), num_alsa_fds, POLLIN);
204 fds[num_alsa_fds].fd = should_quit_fd;
205 fds[num_alsa_fds].events = POLLIN;
206 fds[num_alsa_fds].revents = 0;
208 err = poll(fds.get(), num_alsa_fds + 1, -1);
209 if (err == 0 || (err == -1 && errno == EINTR)) {
216 if (fds[num_alsa_fds].revents) {
217 // Activity on should_quit_fd.
221 // Seemingly we can get multiple events in a single poll,
222 // and if we don't handle them all, poll will _not_ alert us!
223 while (!should_quit) {
224 snd_seq_event_t *event;
225 err = snd_seq_event_input(seq, &event);
227 if (err == -EINTR) continue;
228 if (err == -EAGAIN) break;
229 fprintf(stderr, "snd_seq_event_input: %s\n", snd_strerror(err));
233 handle_event(seq, event);
239 void MIDIMapper::handle_event(snd_seq_t *seq, snd_seq_event_t *event)
241 if (event->source.client == snd_seq_client_id(seq)) {
242 // Ignore events we sent out ourselves.
246 lock_guard<mutex> lock(mu);
247 switch (event->type) {
248 case SND_SEQ_EVENT_CONTROLLER: {
249 const int controller = event->data.control.param;
250 const float value = map_controller_to_float(event->data.control.value);
252 receiver->controller_changed(controller);
254 // Global controllers.
255 match_controller(controller, MIDIMappingBusProto::kLocutFieldNumber, MIDIMappingProto::kLocutBankFieldNumber,
256 value, bind(&ControllerReceiver::set_locut, receiver, _2));
257 match_controller(controller, MIDIMappingBusProto::kLimiterThresholdFieldNumber, MIDIMappingProto::kLimiterThresholdBankFieldNumber,
258 value, bind(&ControllerReceiver::set_limiter_threshold, receiver, _2));
259 match_controller(controller, MIDIMappingBusProto::kMakeupGainFieldNumber, MIDIMappingProto::kMakeupGainBankFieldNumber,
260 value, bind(&ControllerReceiver::set_makeup_gain, receiver, _2));
263 match_controller(controller, MIDIMappingBusProto::kTrebleFieldNumber, MIDIMappingProto::kTrebleBankFieldNumber,
264 value, bind(&ControllerReceiver::set_treble, receiver, _1, _2));
265 match_controller(controller, MIDIMappingBusProto::kMidFieldNumber, MIDIMappingProto::kMidBankFieldNumber,
266 value, bind(&ControllerReceiver::set_mid, receiver, _1, _2));
267 match_controller(controller, MIDIMappingBusProto::kBassFieldNumber, MIDIMappingProto::kBassBankFieldNumber,
268 value, bind(&ControllerReceiver::set_bass, receiver, _1, _2));
269 match_controller(controller, MIDIMappingBusProto::kGainFieldNumber, MIDIMappingProto::kGainBankFieldNumber,
270 value, bind(&ControllerReceiver::set_gain, receiver, _1, _2));
271 match_controller(controller, MIDIMappingBusProto::kCompressorThresholdFieldNumber, MIDIMappingProto::kCompressorThresholdBankFieldNumber,
272 value, bind(&ControllerReceiver::set_compressor_threshold, receiver, _1, _2));
273 match_controller(controller, MIDIMappingBusProto::kFaderFieldNumber, MIDIMappingProto::kFaderBankFieldNumber,
274 value, bind(&ControllerReceiver::set_fader, receiver, _1, _2));
277 case SND_SEQ_EVENT_NOTEON: {
278 const int note = event->data.note.note;
280 receiver->note_on(note);
282 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
283 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
284 if (bus_mapping.has_prev_bank() &&
285 bus_mapping.prev_bank().note_number() == note) {
286 current_controller_bank = (current_controller_bank + num_controller_banks - 1) % num_controller_banks;
288 update_lights_lock_held();
290 if (bus_mapping.has_next_bank() &&
291 bus_mapping.next_bank().note_number() == note) {
292 current_controller_bank = (current_controller_bank + 1) % num_controller_banks;
294 update_lights_lock_held();
296 if (bus_mapping.has_select_bank_1() &&
297 bus_mapping.select_bank_1().note_number() == note) {
298 current_controller_bank = 0;
300 update_lights_lock_held();
302 if (bus_mapping.has_select_bank_2() &&
303 bus_mapping.select_bank_2().note_number() == note &&
304 num_controller_banks >= 2) {
305 current_controller_bank = 1;
307 update_lights_lock_held();
309 if (bus_mapping.has_select_bank_3() &&
310 bus_mapping.select_bank_3().note_number() == note &&
311 num_controller_banks >= 3) {
312 current_controller_bank = 2;
314 update_lights_lock_held();
316 if (bus_mapping.has_select_bank_4() &&
317 bus_mapping.select_bank_4().note_number() == note &&
318 num_controller_banks >= 4) {
319 current_controller_bank = 3;
321 update_lights_lock_held();
323 if (bus_mapping.has_select_bank_5() &&
324 bus_mapping.select_bank_5().note_number() == note &&
325 num_controller_banks >= 5) {
326 current_controller_bank = 4;
328 update_lights_lock_held();
332 match_button(note, MIDIMappingBusProto::kToggleLocutFieldNumber, MIDIMappingProto::kToggleLocutBankFieldNumber,
333 bind(&ControllerReceiver::toggle_locut, receiver, _1));
334 match_button(note, MIDIMappingBusProto::kToggleAutoGainStagingFieldNumber, MIDIMappingProto::kToggleAutoGainStagingBankFieldNumber,
335 bind(&ControllerReceiver::toggle_auto_gain_staging, receiver, _1));
336 match_button(note, MIDIMappingBusProto::kToggleCompressorFieldNumber, MIDIMappingProto::kToggleCompressorBankFieldNumber,
337 bind(&ControllerReceiver::toggle_compressor, receiver, _1));
338 match_button(note, MIDIMappingBusProto::kClearPeakFieldNumber, MIDIMappingProto::kClearPeakBankFieldNumber,
339 bind(&ControllerReceiver::clear_peak, receiver, _1));
340 match_button(note, MIDIMappingBusProto::kToggleMuteFieldNumber, MIDIMappingProto::kClearPeakBankFieldNumber,
341 bind(&ControllerReceiver::toggle_mute, receiver, _1));
342 match_button(note, MIDIMappingBusProto::kToggleLimiterFieldNumber, MIDIMappingProto::kToggleLimiterBankFieldNumber,
343 bind(&ControllerReceiver::toggle_limiter, receiver));
344 match_button(note, MIDIMappingBusProto::kToggleAutoMakeupGainFieldNumber, MIDIMappingProto::kToggleAutoMakeupGainBankFieldNumber,
345 bind(&ControllerReceiver::toggle_auto_makeup_gain, receiver));
347 case SND_SEQ_EVENT_PORT_START:
348 subscribe_to_port_lock_held(seq, event->data.addr);
350 case SND_SEQ_EVENT_PORT_EXIT:
351 printf("MIDI port %d:%d went away.\n", event->data.addr.client, event->data.addr.port);
353 case SND_SEQ_EVENT_PORT_SUBSCRIBED:
354 if (event->data.connect.sender.client != 0 && // Ignore system senders.
355 event->data.connect.sender.client != snd_seq_client_id(seq) &&
356 event->data.connect.dest.client == snd_seq_client_id(seq)) {
357 ++num_subscribed_ports;
361 case SND_SEQ_EVENT_PORT_UNSUBSCRIBED:
362 if (event->data.connect.sender.client != 0 && // Ignore system senders.
363 event->data.connect.sender.client != snd_seq_client_id(seq) &&
364 event->data.connect.dest.client == snd_seq_client_id(seq)) {
365 --num_subscribed_ports;
369 case SND_SEQ_EVENT_NOTEOFF:
370 case SND_SEQ_EVENT_CLIENT_START:
371 case SND_SEQ_EVENT_CLIENT_EXIT:
372 case SND_SEQ_EVENT_CLIENT_CHANGE:
373 case SND_SEQ_EVENT_PORT_CHANGE:
376 printf("Ignoring MIDI event of unknown type %d.\n", event->type);
380 void MIDIMapper::subscribe_to_port_lock_held(snd_seq_t *seq, const snd_seq_addr_t &addr)
382 // Client 0 is basically the system; ignore it.
383 if (addr.client == 0) {
387 int err = snd_seq_connect_from(seq, 0, addr.client, addr.port);
389 // Just print out a warning (i.e., don't die); it could
390 // very well just be e.g. another application.
391 printf("Couldn't subscribe to MIDI port %d:%d (%s).\n",
392 addr.client, addr.port, snd_strerror(err));
394 printf("Subscribed to MIDI port %d:%d.\n", addr.client, addr.port);
397 // For sending data back.
398 err = snd_seq_connect_to(seq, 0, addr.client, addr.port);
400 printf("Couldn't subscribe MIDI port %d:%d (%s) to us.\n",
401 addr.client, addr.port, snd_strerror(err));
403 printf("Subscribed MIDI port %d:%d to us.\n", addr.client, addr.port);
406 current_light_status.clear(); // The current state of the device is unknown.
407 update_lights_lock_held();
410 void MIDIMapper::match_controller(int controller, int field_number, int bank_field_number, float value, function<void(unsigned, float)> func)
412 if (bank_mismatch(bank_field_number)) {
416 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
417 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
419 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
420 const Reflection *bus_reflection = bus_mapping.GetReflection();
421 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
424 const MIDIControllerProto &controller_proto =
425 static_cast<const MIDIControllerProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
426 if (controller_proto.controller_number() == controller) {
427 func(bus_idx, value);
432 void MIDIMapper::match_button(int note, int field_number, int bank_field_number, function<void(unsigned)> func)
434 if (bank_mismatch(bank_field_number)) {
438 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
439 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
441 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
442 const Reflection *bus_reflection = bus_mapping.GetReflection();
443 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
446 const MIDIButtonProto &button_proto =
447 static_cast<const MIDIButtonProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
448 if (button_proto.note_number() == note) {
454 bool MIDIMapper::has_active_controller(unsigned bus_idx, int field_number, int bank_field_number)
456 if (bank_mismatch(bank_field_number)) {
460 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
461 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
462 const Reflection *bus_reflection = bus_mapping.GetReflection();
463 return bus_reflection->HasField(bus_mapping, descriptor);
466 bool MIDIMapper::bank_mismatch(int bank_field_number)
468 const FieldDescriptor *bank_descriptor = mapping_proto->GetDescriptor()->FindFieldByNumber(bank_field_number);
469 const Reflection *reflection = mapping_proto->GetReflection();
470 return (reflection->HasField(*mapping_proto, bank_descriptor) &&
471 reflection->GetInt32(*mapping_proto, bank_descriptor) != current_controller_bank);
474 void MIDIMapper::refresh_highlights()
476 receiver->clear_all_highlights();
480 void MIDIMapper::refresh_lights()
482 lock_guard<mutex> lock(mu);
483 update_lights_lock_held();
486 void MIDIMapper::update_highlights()
488 if (num_subscribed_ports.load() == 0) {
489 receiver->clear_all_highlights();
493 // Global controllers.
494 bool highlight_locut = false;
495 bool highlight_limiter_threshold = false;
496 bool highlight_makeup_gain = false;
497 bool highlight_toggle_limiter = false;
498 bool highlight_toggle_auto_makeup_gain = false;
499 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
500 if (has_active_controller(
501 bus_idx, MIDIMappingBusProto::kLocutFieldNumber, MIDIMappingProto::kLocutBankFieldNumber)) {
502 highlight_locut = true;
504 if (has_active_controller(
505 bus_idx, MIDIMappingBusProto::kLimiterThresholdFieldNumber, MIDIMappingProto::kLimiterThresholdBankFieldNumber)) {
506 highlight_limiter_threshold = true;
508 if (has_active_controller(
509 bus_idx, MIDIMappingBusProto::kMakeupGainFieldNumber, MIDIMappingProto::kMakeupGainBankFieldNumber)) {
510 highlight_makeup_gain = true;
512 if (has_active_controller(
513 bus_idx, MIDIMappingBusProto::kToggleLimiterFieldNumber, MIDIMappingProto::kToggleLimiterBankFieldNumber)) {
514 highlight_toggle_limiter = true;
516 if (has_active_controller(
517 bus_idx, MIDIMappingBusProto::kToggleAutoMakeupGainFieldNumber, MIDIMappingProto::kToggleAutoMakeupGainBankFieldNumber)) {
518 highlight_toggle_auto_makeup_gain = true;
521 receiver->highlight_locut(highlight_locut);
522 receiver->highlight_limiter_threshold(highlight_limiter_threshold);
523 receiver->highlight_makeup_gain(highlight_makeup_gain);
524 receiver->highlight_toggle_limiter(highlight_toggle_limiter);
525 receiver->highlight_toggle_auto_makeup_gain(highlight_toggle_auto_makeup_gain);
527 // Per-bus controllers.
528 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
529 receiver->highlight_treble(bus_idx, has_active_controller(
530 bus_idx, MIDIMappingBusProto::kTrebleFieldNumber, MIDIMappingProto::kTrebleBankFieldNumber));
531 receiver->highlight_mid(bus_idx, has_active_controller(
532 bus_idx, MIDIMappingBusProto::kMidFieldNumber, MIDIMappingProto::kMidBankFieldNumber));
533 receiver->highlight_bass(bus_idx, has_active_controller(
534 bus_idx, MIDIMappingBusProto::kBassFieldNumber, MIDIMappingProto::kBassBankFieldNumber));
535 receiver->highlight_gain(bus_idx, has_active_controller(
536 bus_idx, MIDIMappingBusProto::kGainFieldNumber, MIDIMappingProto::kGainBankFieldNumber));
537 receiver->highlight_compressor_threshold(bus_idx, has_active_controller(
538 bus_idx, MIDIMappingBusProto::kCompressorThresholdFieldNumber, MIDIMappingProto::kCompressorThresholdBankFieldNumber));
539 receiver->highlight_fader(bus_idx, has_active_controller(
540 bus_idx, MIDIMappingBusProto::kFaderFieldNumber, MIDIMappingProto::kFaderBankFieldNumber));
541 receiver->highlight_mute(bus_idx, has_active_controller(
542 bus_idx, MIDIMappingBusProto::kToggleMuteFieldNumber, MIDIMappingProto::kToggleMuteBankFieldNumber));
543 receiver->highlight_toggle_locut(bus_idx, has_active_controller(
544 bus_idx, MIDIMappingBusProto::kToggleLocutFieldNumber, MIDIMappingProto::kToggleLocutBankFieldNumber));
545 receiver->highlight_toggle_auto_gain_staging(bus_idx, has_active_controller(
546 bus_idx, MIDIMappingBusProto::kToggleAutoGainStagingFieldNumber, MIDIMappingProto::kToggleAutoGainStagingBankFieldNumber));
547 receiver->highlight_toggle_compressor(bus_idx, has_active_controller(
548 bus_idx, MIDIMappingBusProto::kToggleCompressorFieldNumber, MIDIMappingProto::kToggleCompressorBankFieldNumber));
552 void MIDIMapper::update_lights_lock_held()
554 if (alsa_seq == nullptr || global_audio_mixer == nullptr) {
558 set<unsigned> active_lights; // Desired state.
559 if (current_controller_bank == 0) {
560 activate_lights_all_buses(MIDIMappingBusProto::kBank1IsSelectedFieldNumber, &active_lights);
562 if (current_controller_bank == 1) {
563 activate_lights_all_buses(MIDIMappingBusProto::kBank2IsSelectedFieldNumber, &active_lights);
565 if (current_controller_bank == 2) {
566 activate_lights_all_buses(MIDIMappingBusProto::kBank3IsSelectedFieldNumber, &active_lights);
568 if (current_controller_bank == 3) {
569 activate_lights_all_buses(MIDIMappingBusProto::kBank4IsSelectedFieldNumber, &active_lights);
571 if (current_controller_bank == 4) {
572 activate_lights_all_buses(MIDIMappingBusProto::kBank5IsSelectedFieldNumber, &active_lights);
574 if (global_audio_mixer->get_limiter_enabled()) {
575 activate_lights_all_buses(MIDIMappingBusProto::kLimiterIsOnFieldNumber, &active_lights);
577 if (global_audio_mixer->get_final_makeup_gain_auto()) {
578 activate_lights_all_buses(MIDIMappingBusProto::kAutoMakeupGainIsOnFieldNumber, &active_lights);
580 unsigned num_buses = min<unsigned>(global_audio_mixer->num_buses(), mapping_proto->bus_mapping_size());
581 for (unsigned bus_idx = 0; bus_idx < num_buses; ++bus_idx) {
582 if (global_audio_mixer->get_mute(bus_idx)) {
583 activate_lights(bus_idx, MIDIMappingBusProto::kIsMutedFieldNumber, &active_lights);
585 if (global_audio_mixer->get_locut_enabled(bus_idx)) {
586 activate_lights(bus_idx, MIDIMappingBusProto::kLocutIsOnFieldNumber, &active_lights);
588 if (global_audio_mixer->get_gain_staging_auto(bus_idx)) {
589 activate_lights(bus_idx, MIDIMappingBusProto::kAutoGainStagingIsOnFieldNumber, &active_lights);
591 if (global_audio_mixer->get_compressor_enabled(bus_idx)) {
592 activate_lights(bus_idx, MIDIMappingBusProto::kCompressorIsOnFieldNumber, &active_lights);
594 if (has_peaked[bus_idx]) {
595 activate_lights(bus_idx, MIDIMappingBusProto::kHasPeakedFieldNumber, &active_lights);
599 unsigned num_events = 0;
600 for (unsigned note_num = 1; note_num <= 127; ++note_num) {
601 bool active = active_lights.count(note_num);
602 if (current_light_status.count(note_num) &&
603 current_light_status[note_num] == active) {
604 // Already known to be in the desired state.
609 snd_seq_ev_clear(&ev);
611 // Some devices drop events if we throw them onto them
612 // too quickly. Add a 1 ms delay for each.
613 snd_seq_real_time_t tm{0, num_events++ * 1000000};
614 snd_seq_ev_schedule_real(&ev, alsa_queue_id, true, &tm);
615 snd_seq_ev_set_source(&ev, 0);
616 snd_seq_ev_set_subs(&ev);
618 // For some reason, not all devices respond to note off.
619 // Use note-on with velocity of 0 (which is equivalent) instead.
620 snd_seq_ev_set_noteon(&ev, /*channel=*/0, note_num, active ? 127 : 0);
621 WARN_ON_ERROR("snd_seq_event_output", snd_seq_event_output(alsa_seq, &ev));
622 current_light_status[note_num] = active;
624 WARN_ON_ERROR("snd_seq_drain_output", snd_seq_drain_output(alsa_seq));
627 void MIDIMapper::activate_lights(unsigned bus_idx, int field_number, set<unsigned> *active_lights)
629 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
631 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
632 const Reflection *bus_reflection = bus_mapping.GetReflection();
633 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
636 const MIDILightProto &light_proto =
637 static_cast<const MIDILightProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
638 active_lights->insert(light_proto.note_number());
641 void MIDIMapper::activate_lights_all_buses(int field_number, set<unsigned> *active_lights)
643 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
644 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
646 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
647 const Reflection *bus_reflection = bus_mapping.GetReflection();
648 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
651 const MIDILightProto &light_proto =
652 static_cast<const MIDILightProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
653 active_lights->insert(light_proto.note_number());