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>
15 #include <sys/eventfd.h>
21 #include "audio_mixer.h"
22 #include "midi_mapping.pb.h"
24 using namespace google::protobuf;
26 using namespace std::placeholders;
30 double map_controller_to_float(int val)
32 // Slightly hackish mapping so that we can represent exactly 0.0, 0.5 and 1.0.
35 } else if (val >= 127) {
38 return (val + 0.5) / 127.0;
44 MIDIMapper::MIDIMapper(ControllerReceiver *receiver)
45 : receiver(receiver), mapping_proto(new MIDIMappingProto)
47 should_quit_fd = eventfd(/*initval=*/0, /*flags=*/0);
48 assert(should_quit_fd != -1);
51 MIDIMapper::~MIDIMapper()
54 const uint64_t one = 1;
55 if (write(should_quit_fd, &one, sizeof(one)) != sizeof(one)) {
56 perror("write(should_quit_fd)");
60 close(should_quit_fd);
63 bool load_midi_mapping_from_file(const string &filename, MIDIMappingProto *new_mapping)
65 // Read and parse the protobuf from disk.
66 int fd = open(filename.c_str(), O_RDONLY);
68 perror(filename.c_str());
71 io::FileInputStream input(fd); // Takes ownership of fd.
72 if (!TextFormat::Parse(&input, new_mapping)) {
80 bool save_midi_mapping_to_file(const MIDIMappingProto &mapping_proto, const string &filename)
82 // Save to disk. We use the text format because it's friendlier
83 // for a user to look at and edit.
84 int fd = open(filename.c_str(), O_WRONLY | O_TRUNC | O_CREAT, 0666);
86 perror(filename.c_str());
89 io::FileOutputStream output(fd); // Takes ownership of fd.
90 if (!TextFormat::Print(mapping_proto, &output)) {
91 // TODO: Don't overwrite the old file (if any) on error.
100 void MIDIMapper::set_midi_mapping(const MIDIMappingProto &new_mapping)
102 lock_guard<mutex> lock(mu);
104 mapping_proto->CopyFrom(new_mapping);
106 mapping_proto.reset(new MIDIMappingProto(new_mapping));
109 num_controller_banks = min(max(mapping_proto->num_controller_banks(), 1), 5);
110 current_controller_bank = 0;
112 receiver->clear_all_highlights();
116 void MIDIMapper::start_thread()
118 midi_thread = thread(&MIDIMapper::thread_func, this);
121 const MIDIMappingProto &MIDIMapper::get_current_mapping() const
123 lock_guard<mutex> lock(mu);
124 return *mapping_proto;
127 ControllerReceiver *MIDIMapper::set_receiver(ControllerReceiver *new_receiver)
129 lock_guard<mutex> lock(mu);
130 swap(receiver, new_receiver);
131 return new_receiver; // Now old receiver.
134 #define RETURN_ON_ERROR(msg, expr) do { \
137 fprintf(stderr, msg ": %s\n", snd_strerror(err)); \
142 #define WARN_ON_ERROR(msg, expr) do { \
145 fprintf(stderr, msg ": %s\n", snd_strerror(err)); \
150 void MIDIMapper::thread_func()
152 pthread_setname_np(pthread_self(), "MIDIMapper");
157 RETURN_ON_ERROR("snd_seq_open", snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX, 0));
158 RETURN_ON_ERROR("snd_seq_nonblock", snd_seq_nonblock(seq, 1));
159 RETURN_ON_ERROR("snd_seq_client_name", snd_seq_set_client_name(seq, "nageru"));
160 RETURN_ON_ERROR("snd_seq_create_simple_port",
161 snd_seq_create_simple_port(seq, "nageru",
162 SND_SEQ_PORT_CAP_READ |
163 SND_SEQ_PORT_CAP_SUBS_READ |
164 SND_SEQ_PORT_CAP_WRITE |
165 SND_SEQ_PORT_CAP_SUBS_WRITE,
166 SND_SEQ_PORT_TYPE_MIDI_GENERIC |
167 SND_SEQ_PORT_TYPE_APPLICATION));
169 int queue_id = snd_seq_alloc_queue(seq);
170 RETURN_ON_ERROR("snd_seq_create_queue", queue_id);
171 RETURN_ON_ERROR("snd_seq_start_queue", snd_seq_start_queue(seq, queue_id, nullptr));
173 // The sequencer object is now ready to be used from other threads.
175 lock_guard<mutex> lock(mu);
177 alsa_queue_id = queue_id;
180 // Listen to the announce port (0:1), which will tell us about new ports.
181 RETURN_ON_ERROR("snd_seq_connect_from", snd_seq_connect_from(seq, 0, /*client=*/0, /*port=*/1));
183 // Now go through all ports and subscribe to them.
184 snd_seq_client_info_t *cinfo;
185 snd_seq_client_info_alloca(&cinfo);
187 snd_seq_client_info_set_client(cinfo, -1);
188 while (snd_seq_query_next_client(seq, cinfo) >= 0) {
189 int client = snd_seq_client_info_get_client(cinfo);
191 snd_seq_port_info_t *pinfo;
192 snd_seq_port_info_alloca(&pinfo);
194 snd_seq_port_info_set_client(pinfo, client);
195 snd_seq_port_info_set_port(pinfo, -1);
196 while (snd_seq_query_next_port(seq, pinfo) >= 0) {
197 constexpr int mask = SND_SEQ_PORT_CAP_READ | SND_SEQ_PORT_CAP_SUBS_READ;
198 if ((snd_seq_port_info_get_capability(pinfo) & mask) == mask) {
199 lock_guard<mutex> lock(mu);
200 subscribe_to_port_lock_held(seq, *snd_seq_port_info_get_addr(pinfo));
205 int num_alsa_fds = snd_seq_poll_descriptors_count(seq, POLLIN);
206 unique_ptr<pollfd[]> fds(new pollfd[num_alsa_fds + 1]);
208 while (!should_quit) {
209 snd_seq_poll_descriptors(seq, fds.get(), num_alsa_fds, POLLIN);
210 fds[num_alsa_fds].fd = should_quit_fd;
211 fds[num_alsa_fds].events = POLLIN;
212 fds[num_alsa_fds].revents = 0;
214 err = poll(fds.get(), num_alsa_fds + 1, -1);
215 if (err == 0 || (err == -1 && errno == EINTR)) {
222 if (fds[num_alsa_fds].revents) {
223 // Activity on should_quit_fd.
227 // Seemingly we can get multiple events in a single poll,
228 // and if we don't handle them all, poll will _not_ alert us!
229 while (!should_quit) {
230 snd_seq_event_t *event;
231 err = snd_seq_event_input(seq, &event);
233 if (err == -EINTR) continue;
234 if (err == -EAGAIN) break;
235 if (err == -ENOSPC) {
236 fprintf(stderr, "snd_seq_event_input: Some events were lost.\n");
239 fprintf(stderr, "snd_seq_event_input: %s\n", snd_strerror(err));
243 handle_event(seq, event);
249 void MIDIMapper::handle_event(snd_seq_t *seq, snd_seq_event_t *event)
251 if (event->source.client == snd_seq_client_id(seq)) {
252 // Ignore events we sent out ourselves.
256 lock_guard<mutex> lock(mu);
257 switch (event->type) {
258 case SND_SEQ_EVENT_CONTROLLER: {
259 const int controller = event->data.control.param;
260 const float value = map_controller_to_float(event->data.control.value);
262 receiver->controller_changed(controller);
264 // Global controllers.
265 match_controller(controller, MIDIMappingBusProto::kLocutFieldNumber, MIDIMappingProto::kLocutBankFieldNumber,
266 value, bind(&ControllerReceiver::set_locut, receiver, _2));
267 match_controller(controller, MIDIMappingBusProto::kLimiterThresholdFieldNumber, MIDIMappingProto::kLimiterThresholdBankFieldNumber,
268 value, bind(&ControllerReceiver::set_limiter_threshold, receiver, _2));
269 match_controller(controller, MIDIMappingBusProto::kMakeupGainFieldNumber, MIDIMappingProto::kMakeupGainBankFieldNumber,
270 value, bind(&ControllerReceiver::set_makeup_gain, receiver, _2));
273 match_controller(controller, MIDIMappingBusProto::kStereoWidthFieldNumber, MIDIMappingProto::kStereoWidthBankFieldNumber,
274 value, bind(&ControllerReceiver::set_stereo_width, receiver, _1, _2));
275 match_controller(controller, MIDIMappingBusProto::kTrebleFieldNumber, MIDIMappingProto::kTrebleBankFieldNumber,
276 value, bind(&ControllerReceiver::set_treble, receiver, _1, _2));
277 match_controller(controller, MIDIMappingBusProto::kMidFieldNumber, MIDIMappingProto::kMidBankFieldNumber,
278 value, bind(&ControllerReceiver::set_mid, receiver, _1, _2));
279 match_controller(controller, MIDIMappingBusProto::kBassFieldNumber, MIDIMappingProto::kBassBankFieldNumber,
280 value, bind(&ControllerReceiver::set_bass, receiver, _1, _2));
281 match_controller(controller, MIDIMappingBusProto::kGainFieldNumber, MIDIMappingProto::kGainBankFieldNumber,
282 value, bind(&ControllerReceiver::set_gain, receiver, _1, _2));
283 match_controller(controller, MIDIMappingBusProto::kCompressorThresholdFieldNumber, MIDIMappingProto::kCompressorThresholdBankFieldNumber,
284 value, bind(&ControllerReceiver::set_compressor_threshold, receiver, _1, _2));
285 match_controller(controller, MIDIMappingBusProto::kFaderFieldNumber, MIDIMappingProto::kFaderBankFieldNumber,
286 value, bind(&ControllerReceiver::set_fader, receiver, _1, _2));
289 case SND_SEQ_EVENT_NOTEON: {
290 const int note = event->data.note.note;
292 receiver->note_on(note);
294 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
295 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
296 if (bus_mapping.has_prev_bank() &&
297 bus_mapping.prev_bank().note_number() == note) {
298 current_controller_bank = (current_controller_bank + num_controller_banks - 1) % num_controller_banks;
300 update_lights_lock_held();
302 if (bus_mapping.has_next_bank() &&
303 bus_mapping.next_bank().note_number() == note) {
304 current_controller_bank = (current_controller_bank + 1) % num_controller_banks;
306 update_lights_lock_held();
308 if (bus_mapping.has_select_bank_1() &&
309 bus_mapping.select_bank_1().note_number() == note) {
310 current_controller_bank = 0;
312 update_lights_lock_held();
314 if (bus_mapping.has_select_bank_2() &&
315 bus_mapping.select_bank_2().note_number() == note &&
316 num_controller_banks >= 2) {
317 current_controller_bank = 1;
319 update_lights_lock_held();
321 if (bus_mapping.has_select_bank_3() &&
322 bus_mapping.select_bank_3().note_number() == note &&
323 num_controller_banks >= 3) {
324 current_controller_bank = 2;
326 update_lights_lock_held();
328 if (bus_mapping.has_select_bank_4() &&
329 bus_mapping.select_bank_4().note_number() == note &&
330 num_controller_banks >= 4) {
331 current_controller_bank = 3;
333 update_lights_lock_held();
335 if (bus_mapping.has_select_bank_5() &&
336 bus_mapping.select_bank_5().note_number() == note &&
337 num_controller_banks >= 5) {
338 current_controller_bank = 4;
340 update_lights_lock_held();
344 match_button(note, MIDIMappingBusProto::kToggleLocutFieldNumber, MIDIMappingProto::kToggleLocutBankFieldNumber,
345 bind(&ControllerReceiver::toggle_locut, receiver, _1));
346 match_button(note, MIDIMappingBusProto::kToggleAutoGainStagingFieldNumber, MIDIMappingProto::kToggleAutoGainStagingBankFieldNumber,
347 bind(&ControllerReceiver::toggle_auto_gain_staging, receiver, _1));
348 match_button(note, MIDIMappingBusProto::kToggleCompressorFieldNumber, MIDIMappingProto::kToggleCompressorBankFieldNumber,
349 bind(&ControllerReceiver::toggle_compressor, receiver, _1));
350 match_button(note, MIDIMappingBusProto::kClearPeakFieldNumber, MIDIMappingProto::kClearPeakBankFieldNumber,
351 bind(&ControllerReceiver::clear_peak, receiver, _1));
352 match_button(note, MIDIMappingBusProto::kToggleMuteFieldNumber, MIDIMappingProto::kClearPeakBankFieldNumber,
353 bind(&ControllerReceiver::toggle_mute, receiver, _1));
354 match_button(note, MIDIMappingBusProto::kToggleLimiterFieldNumber, MIDIMappingProto::kToggleLimiterBankFieldNumber,
355 bind(&ControllerReceiver::toggle_limiter, receiver));
356 match_button(note, MIDIMappingBusProto::kToggleAutoMakeupGainFieldNumber, MIDIMappingProto::kToggleAutoMakeupGainBankFieldNumber,
357 bind(&ControllerReceiver::toggle_auto_makeup_gain, receiver));
360 case SND_SEQ_EVENT_PORT_START:
361 subscribe_to_port_lock_held(seq, event->data.addr);
363 case SND_SEQ_EVENT_PORT_EXIT:
364 printf("MIDI port %d:%d went away.\n", event->data.addr.client, event->data.addr.port);
366 case SND_SEQ_EVENT_PORT_SUBSCRIBED:
367 if (event->data.connect.sender.client != 0 && // Ignore system senders.
368 event->data.connect.sender.client != snd_seq_client_id(seq) &&
369 event->data.connect.dest.client == snd_seq_client_id(seq)) {
370 ++num_subscribed_ports;
374 case SND_SEQ_EVENT_PORT_UNSUBSCRIBED:
375 if (event->data.connect.sender.client != 0 && // Ignore system senders.
376 event->data.connect.sender.client != snd_seq_client_id(seq) &&
377 event->data.connect.dest.client == snd_seq_client_id(seq)) {
378 --num_subscribed_ports;
382 case SND_SEQ_EVENT_NOTEOFF:
383 case SND_SEQ_EVENT_CLIENT_START:
384 case SND_SEQ_EVENT_CLIENT_EXIT:
385 case SND_SEQ_EVENT_CLIENT_CHANGE:
386 case SND_SEQ_EVENT_PORT_CHANGE:
389 printf("Ignoring MIDI event of unknown type %d.\n", event->type);
393 void MIDIMapper::subscribe_to_port_lock_held(snd_seq_t *seq, const snd_seq_addr_t &addr)
395 // Client 0 (SNDRV_SEQ_CLIENT_SYSTEM) is basically the system; ignore it.
396 // MIDI through (SNDRV_SEQ_CLIENT_DUMMY) echoes back what we give it, so ignore that, too.
397 if (addr.client == 0 || addr.client == 14) {
401 // Don't listen to ourselves.
402 if (addr.client == snd_seq_client_id(seq)) {
406 int err = snd_seq_connect_from(seq, 0, addr.client, addr.port);
408 // Just print out a warning (i.e., don't die); it could
409 // very well just be e.g. another application.
410 printf("Couldn't subscribe to MIDI port %d:%d (%s).\n",
411 addr.client, addr.port, snd_strerror(err));
413 printf("Subscribed to MIDI port %d:%d.\n", addr.client, addr.port);
416 // For sending data back.
417 err = snd_seq_connect_to(seq, 0, addr.client, addr.port);
419 printf("Couldn't subscribe MIDI port %d:%d (%s) to us.\n",
420 addr.client, addr.port, snd_strerror(err));
422 printf("Subscribed MIDI port %d:%d to us.\n", addr.client, addr.port);
425 current_light_status.clear(); // The current state of the device is unknown.
426 update_lights_lock_held();
429 void MIDIMapper::match_controller(int controller, int field_number, int bank_field_number, float value, function<void(unsigned, float)> func)
431 if (bank_mismatch(bank_field_number)) {
435 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
436 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
438 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
439 const Reflection *bus_reflection = bus_mapping.GetReflection();
440 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
443 const MIDIControllerProto &controller_proto =
444 static_cast<const MIDIControllerProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
445 if (controller_proto.controller_number() == controller) {
446 func(bus_idx, value);
451 void MIDIMapper::match_button(int note, int field_number, int bank_field_number, function<void(unsigned)> func)
453 if (bank_mismatch(bank_field_number)) {
457 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
458 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
460 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
461 const Reflection *bus_reflection = bus_mapping.GetReflection();
462 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
465 const MIDIButtonProto &button_proto =
466 static_cast<const MIDIButtonProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
467 if (button_proto.note_number() == note) {
473 bool MIDIMapper::has_active_controller(unsigned bus_idx, int field_number, int bank_field_number)
475 if (bank_mismatch(bank_field_number)) {
479 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
480 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
481 const Reflection *bus_reflection = bus_mapping.GetReflection();
482 return bus_reflection->HasField(bus_mapping, descriptor);
485 bool MIDIMapper::bank_mismatch(int bank_field_number)
487 const FieldDescriptor *bank_descriptor = mapping_proto->GetDescriptor()->FindFieldByNumber(bank_field_number);
488 const Reflection *reflection = mapping_proto->GetReflection();
489 return (reflection->HasField(*mapping_proto, bank_descriptor) &&
490 reflection->GetInt32(*mapping_proto, bank_descriptor) != current_controller_bank);
493 void MIDIMapper::refresh_highlights()
495 receiver->clear_all_highlights();
499 void MIDIMapper::refresh_lights()
501 lock_guard<mutex> lock(mu);
502 update_lights_lock_held();
505 void MIDIMapper::update_highlights()
507 if (num_subscribed_ports.load() == 0) {
508 receiver->clear_all_highlights();
512 // Global controllers.
513 bool highlight_locut = false;
514 bool highlight_limiter_threshold = false;
515 bool highlight_makeup_gain = false;
516 bool highlight_toggle_limiter = false;
517 bool highlight_toggle_auto_makeup_gain = false;
518 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
519 if (has_active_controller(
520 bus_idx, MIDIMappingBusProto::kLocutFieldNumber, MIDIMappingProto::kLocutBankFieldNumber)) {
521 highlight_locut = true;
523 if (has_active_controller(
524 bus_idx, MIDIMappingBusProto::kLimiterThresholdFieldNumber, MIDIMappingProto::kLimiterThresholdBankFieldNumber)) {
525 highlight_limiter_threshold = true;
527 if (has_active_controller(
528 bus_idx, MIDIMappingBusProto::kMakeupGainFieldNumber, MIDIMappingProto::kMakeupGainBankFieldNumber)) {
529 highlight_makeup_gain = true;
531 if (has_active_controller(
532 bus_idx, MIDIMappingBusProto::kToggleLimiterFieldNumber, MIDIMappingProto::kToggleLimiterBankFieldNumber)) {
533 highlight_toggle_limiter = true;
535 if (has_active_controller(
536 bus_idx, MIDIMappingBusProto::kToggleAutoMakeupGainFieldNumber, MIDIMappingProto::kToggleAutoMakeupGainBankFieldNumber)) {
537 highlight_toggle_auto_makeup_gain = true;
540 receiver->highlight_locut(highlight_locut);
541 receiver->highlight_limiter_threshold(highlight_limiter_threshold);
542 receiver->highlight_makeup_gain(highlight_makeup_gain);
543 receiver->highlight_toggle_limiter(highlight_toggle_limiter);
544 receiver->highlight_toggle_auto_makeup_gain(highlight_toggle_auto_makeup_gain);
546 // Per-bus controllers.
547 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
548 receiver->highlight_stereo_width(bus_idx, has_active_controller(
549 bus_idx, MIDIMappingBusProto::kStereoWidthFieldNumber, MIDIMappingProto::kStereoWidthBankFieldNumber));
550 receiver->highlight_treble(bus_idx, has_active_controller(
551 bus_idx, MIDIMappingBusProto::kTrebleFieldNumber, MIDIMappingProto::kTrebleBankFieldNumber));
552 receiver->highlight_mid(bus_idx, has_active_controller(
553 bus_idx, MIDIMappingBusProto::kMidFieldNumber, MIDIMappingProto::kMidBankFieldNumber));
554 receiver->highlight_bass(bus_idx, has_active_controller(
555 bus_idx, MIDIMappingBusProto::kBassFieldNumber, MIDIMappingProto::kBassBankFieldNumber));
556 receiver->highlight_gain(bus_idx, has_active_controller(
557 bus_idx, MIDIMappingBusProto::kGainFieldNumber, MIDIMappingProto::kGainBankFieldNumber));
558 receiver->highlight_compressor_threshold(bus_idx, has_active_controller(
559 bus_idx, MIDIMappingBusProto::kCompressorThresholdFieldNumber, MIDIMappingProto::kCompressorThresholdBankFieldNumber));
560 receiver->highlight_fader(bus_idx, has_active_controller(
561 bus_idx, MIDIMappingBusProto::kFaderFieldNumber, MIDIMappingProto::kFaderBankFieldNumber));
562 receiver->highlight_mute(bus_idx, has_active_controller(
563 bus_idx, MIDIMappingBusProto::kToggleMuteFieldNumber, MIDIMappingProto::kToggleMuteBankFieldNumber));
564 receiver->highlight_toggle_locut(bus_idx, has_active_controller(
565 bus_idx, MIDIMappingBusProto::kToggleLocutFieldNumber, MIDIMappingProto::kToggleLocutBankFieldNumber));
566 receiver->highlight_toggle_auto_gain_staging(bus_idx, has_active_controller(
567 bus_idx, MIDIMappingBusProto::kToggleAutoGainStagingFieldNumber, MIDIMappingProto::kToggleAutoGainStagingBankFieldNumber));
568 receiver->highlight_toggle_compressor(bus_idx, has_active_controller(
569 bus_idx, MIDIMappingBusProto::kToggleCompressorFieldNumber, MIDIMappingProto::kToggleCompressorBankFieldNumber));
573 void MIDIMapper::update_lights_lock_held()
575 if (alsa_seq == nullptr || global_audio_mixer == nullptr) {
579 set<unsigned> active_lights; // Desired state.
580 if (current_controller_bank == 0) {
581 activate_lights_all_buses(MIDIMappingBusProto::kBank1IsSelectedFieldNumber, &active_lights);
583 if (current_controller_bank == 1) {
584 activate_lights_all_buses(MIDIMappingBusProto::kBank2IsSelectedFieldNumber, &active_lights);
586 if (current_controller_bank == 2) {
587 activate_lights_all_buses(MIDIMappingBusProto::kBank3IsSelectedFieldNumber, &active_lights);
589 if (current_controller_bank == 3) {
590 activate_lights_all_buses(MIDIMappingBusProto::kBank4IsSelectedFieldNumber, &active_lights);
592 if (current_controller_bank == 4) {
593 activate_lights_all_buses(MIDIMappingBusProto::kBank5IsSelectedFieldNumber, &active_lights);
595 if (global_audio_mixer->get_limiter_enabled()) {
596 activate_lights_all_buses(MIDIMappingBusProto::kLimiterIsOnFieldNumber, &active_lights);
598 if (global_audio_mixer->get_final_makeup_gain_auto()) {
599 activate_lights_all_buses(MIDIMappingBusProto::kAutoMakeupGainIsOnFieldNumber, &active_lights);
601 unsigned num_buses = min<unsigned>(global_audio_mixer->num_buses(), mapping_proto->bus_mapping_size());
602 for (unsigned bus_idx = 0; bus_idx < num_buses; ++bus_idx) {
603 if (global_audio_mixer->get_mute(bus_idx)) {
604 activate_lights(bus_idx, MIDIMappingBusProto::kIsMutedFieldNumber, &active_lights);
606 if (global_audio_mixer->get_locut_enabled(bus_idx)) {
607 activate_lights(bus_idx, MIDIMappingBusProto::kLocutIsOnFieldNumber, &active_lights);
609 if (global_audio_mixer->get_gain_staging_auto(bus_idx)) {
610 activate_lights(bus_idx, MIDIMappingBusProto::kAutoGainStagingIsOnFieldNumber, &active_lights);
612 if (global_audio_mixer->get_compressor_enabled(bus_idx)) {
613 activate_lights(bus_idx, MIDIMappingBusProto::kCompressorIsOnFieldNumber, &active_lights);
615 if (has_peaked[bus_idx]) {
616 activate_lights(bus_idx, MIDIMappingBusProto::kHasPeakedFieldNumber, &active_lights);
620 unsigned num_events = 0;
621 for (unsigned note_num = 1; note_num <= 127; ++note_num) {
622 bool active = active_lights.count(note_num);
623 if (current_light_status.count(note_num) &&
624 current_light_status[note_num] == active) {
625 // Already known to be in the desired state.
630 snd_seq_ev_clear(&ev);
632 // Some devices drop events if we throw them onto them
633 // too quickly. Add a 1 ms delay for each.
634 snd_seq_real_time_t tm{0, num_events++ * 1000000};
635 snd_seq_ev_schedule_real(&ev, alsa_queue_id, true, &tm);
636 snd_seq_ev_set_source(&ev, 0);
637 snd_seq_ev_set_subs(&ev);
639 // For some reason, not all devices respond to note off.
640 // Use note-on with velocity of 0 (which is equivalent) instead.
641 snd_seq_ev_set_noteon(&ev, /*channel=*/0, note_num, active ? 127 : 0);
642 WARN_ON_ERROR("snd_seq_event_output", snd_seq_event_output(alsa_seq, &ev));
643 current_light_status[note_num] = active;
645 WARN_ON_ERROR("snd_seq_drain_output", snd_seq_drain_output(alsa_seq));
648 void MIDIMapper::activate_lights(unsigned bus_idx, int field_number, set<unsigned> *active_lights)
650 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
652 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
653 const Reflection *bus_reflection = bus_mapping.GetReflection();
654 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
657 const MIDILightProto &light_proto =
658 static_cast<const MIDILightProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
659 active_lights->insert(light_proto.note_number());
662 void MIDIMapper::activate_lights_all_buses(int field_number, set<unsigned> *active_lights)
664 for (size_t bus_idx = 0; bus_idx < size_t(mapping_proto->bus_mapping_size()); ++bus_idx) {
665 const MIDIMappingBusProto &bus_mapping = mapping_proto->bus_mapping(bus_idx);
667 const FieldDescriptor *descriptor = bus_mapping.GetDescriptor()->FindFieldByNumber(field_number);
668 const Reflection *bus_reflection = bus_mapping.GetReflection();
669 if (!bus_reflection->HasField(bus_mapping, descriptor)) {
672 const MIDILightProto &light_proto =
673 static_cast<const MIDILightProto &>(bus_reflection->GetMessage(bus_mapping, descriptor));
674 active_lights->insert(light_proto.note_number());