7 #include <movit/effect_chain.h>
8 #include <movit/effect_util.h>
9 #include <movit/flat_input.h>
10 #include <movit/image_format.h>
11 #include <movit/init.h>
12 #include <movit/resource_pool.h>
16 #include <sys/resource.h>
19 #include <condition_variable>
30 #include "DeckLinkAPI.h"
32 #include "alsa_output.h"
33 #include "bmusb/bmusb.h"
34 #include "bmusb/fake_capture.h"
35 #include "chroma_subsampler.h"
37 #include "decklink_capture.h"
38 #include "decklink_output.h"
40 #include "disk_space_estimator.h"
42 #include "input_mapping.h"
43 #include "pbo_frame_allocator.h"
44 #include "ref_counted_gl_sync.h"
45 #include "resampling_queue.h"
47 #include "video_encoder.h"
52 using namespace movit;
54 using namespace std::chrono;
55 using namespace std::placeholders;
56 using namespace bmusb;
58 Mixer *global_mixer = nullptr;
59 bool uses_mlock = false;
63 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
66 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
67 input_state->buffered_frames[card_index][frame_num] =
68 input_state->buffered_frames[card_index][frame_num - 1];
70 input_state->buffered_frames[card_index][0] = { frame, field_num };
72 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
73 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
80 void QueueLengthPolicy::update_policy(int queue_length)
82 if (queue_length < 0) { // Starvation.
83 if (been_at_safe_point_since_last_starvation && safe_queue_length < 5) {
85 fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frames\n",
86 card_index, safe_queue_length);
88 frames_with_at_least_one = 0;
89 been_at_safe_point_since_last_starvation = false;
92 if (queue_length > 0) {
93 if (queue_length >= int(safe_queue_length)) {
94 been_at_safe_point_since_last_starvation = true;
96 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 0) {
98 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frames\n",
99 card_index, safe_queue_length);
100 frames_with_at_least_one = 0;
103 frames_with_at_least_one = 0;
107 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
109 num_cards(num_cards),
110 mixer_surface(create_surface(format)),
111 h264_encoder_surface(create_surface(format)),
112 decklink_output_surface(create_surface(format)),
113 audio_mixer(num_cards)
115 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
118 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
119 // will be halved when sampling them, and we need to compensate here.
120 movit_texel_subpixel_precision /= 2.0;
122 resource_pool.reset(new ResourcePool);
123 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
124 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
125 output_channel[i].parent = this;
126 output_channel[i].channel = i;
129 ImageFormat inout_format;
130 inout_format.color_space = COLORSPACE_sRGB;
131 inout_format.gamma_curve = GAMMA_sRGB;
133 // Display chain; shows the live output produced by the main chain (its RGBA version).
134 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
136 display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, global_flags.width, global_flags.height); // FIXME: GL_UNSIGNED_BYTE is really wrong.
137 display_chain->add_input(display_input);
138 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
139 display_chain->set_dither_bits(0); // Don't bother.
140 display_chain->finalize();
142 video_encoder.reset(new VideoEncoder(resource_pool.get(), h264_encoder_surface, global_flags.va_display, global_flags.width, global_flags.height, &httpd, global_disk_space_estimator));
144 // Start listening for clients only once VideoEncoder has written its header, if any.
147 // First try initializing the then PCI devices, then USB, then
148 // fill up with fake cards until we have the desired number of cards.
149 unsigned num_pci_devices = 0;
150 unsigned card_index = 0;
153 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
154 if (decklink_iterator != nullptr) {
155 for ( ; card_index < num_cards; ++card_index) {
157 if (decklink_iterator->Next(&decklink) != S_OK) {
161 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
162 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
163 output->set_device(decklink);
164 configure_card(card_index, capture, /*is_fake_capture=*/false, output);
167 decklink_iterator->Release();
168 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
170 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
174 unsigned num_usb_devices = BMUSBCapture::num_cards();
175 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
176 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
177 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
178 configure_card(card_index, capture, /*is_fake_capture=*/false, /*output=*/nullptr);
180 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
182 unsigned num_fake_cards = 0;
183 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
184 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
185 configure_card(card_index, capture, /*is_fake_capture=*/true, /*output=*/nullptr);
188 if (num_fake_cards > 0) {
189 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
192 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
193 BMUSBCapture::start_bm_thread();
195 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
196 cards[card_index].queue_length_policy.reset(card_index);
199 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
201 if (global_flags.enable_alsa_output) {
202 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
204 if (global_flags.output_card != -1) {
205 set_output_card(global_flags.output_card);
211 BMUSBCapture::stop_bm_thread();
213 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
215 unique_lock<mutex> lock(card_mutex);
216 cards[card_index].should_quit = true; // Unblock thread.
217 cards[card_index].new_frames_changed.notify_all();
219 cards[card_index].capture->stop_dequeue_thread();
220 if (cards[card_index].output) {
221 cards[card_index].output->end_output();
222 delete cards[card_index].output;
226 video_encoder.reset(nullptr);
229 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, bool is_fake_capture, DeckLinkOutput *output)
231 printf("Configuring card %d...\n", card_index);
233 CaptureCard *card = &cards[card_index];
234 if (card->capture != nullptr) {
235 card->capture->stop_dequeue_thread();
236 delete card->capture;
238 card->capture = capture;
239 card->is_fake_capture = is_fake_capture;
240 card->output = output;
241 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
242 if (card->frame_allocator == nullptr) {
243 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, global_flags.width, global_flags.height)); // 8 MB.
245 card->capture->set_video_frame_allocator(card->frame_allocator.get());
246 if (card->surface == nullptr) {
247 card->surface = create_surface_with_same_format(mixer_surface);
249 while (!card->new_frames.empty()) card->new_frames.pop();
250 card->last_timecode = -1;
251 card->capture->configure_card();
253 // NOTE: start_bm_capture() happens in thread_func().
255 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
256 audio_mixer.reset_resampler(device);
257 audio_mixer.set_display_name(device, card->capture->get_description());
258 audio_mixer.trigger_state_changed_callback();
261 void Mixer::set_output_card(int card_index)
263 if (card_index == output_card_index) {
266 unique_lock<mutex> lock(card_mutex);
267 if (output_card_index != -1) {
268 // Switch the old card from output to input.
269 CaptureCard *old_card = &cards[output_card_index];
270 old_card->output->end_output();
272 old_card->capture->stop_dequeue_thread();
273 delete old_card->capture;
275 old_card->capture = old_card->parked_capture;
276 old_card->is_fake_capture = false;
277 old_card->parked_capture = nullptr;
278 old_card->capture->start_bm_capture();
281 CaptureCard *card = &cards[card_index];
282 card->capture->stop_dequeue_thread();
283 card->parked_capture = card->capture;
284 card->capture = nullptr;
285 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
286 configure_card(card_index, capture, /*is_fake_capture=*/true, card->output);
287 card->queue_length_policy.reset(card_index);
288 card->capture->start_bm_capture();
289 card->output->start_output(bmdModeHD720p5994, pts_int); // FIXME
290 output_card_index = card_index;
295 int unwrap_timecode(uint16_t current_wrapped, int last)
297 uint16_t last_wrapped = last & 0xffff;
298 if (current_wrapped > last_wrapped) {
299 return (last & ~0xffff) | current_wrapped;
301 return 0x10000 + ((last & ~0xffff) | current_wrapped);
307 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
308 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
309 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
311 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
312 CaptureCard *card = &cards[card_index];
314 if (is_mode_scanning[card_index]) {
315 if (video_format.has_signal) {
316 // Found a stable signal, so stop scanning.
317 is_mode_scanning[card_index] = false;
319 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
320 steady_clock::time_point now = steady_clock::now();
321 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
322 if (sec_since_last_switch > switch_time_s) {
323 // It isn't this mode; try the next one.
324 mode_scanlist_index[card_index]++;
325 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
326 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
327 last_mode_scan_change[card_index] = now;
332 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
333 assert(frame_length > 0);
335 size_t num_samples = (audio_frame.len > audio_offset) ? (audio_frame.len - audio_offset) / audio_format.num_channels / (audio_format.bits_per_sample / 8) : 0;
336 if (num_samples > OUTPUT_FREQUENCY / 10) {
337 printf("Card %d: Dropping frame with implausible audio length (len=%d, offset=%d) [timecode=0x%04x video_len=%d video_offset=%d video_format=%x)\n",
338 card_index, int(audio_frame.len), int(audio_offset),
339 timecode, int(video_frame.len), int(video_offset), video_format.id);
340 if (video_frame.owner) {
341 video_frame.owner->release_frame(video_frame);
343 if (audio_frame.owner) {
344 audio_frame.owner->release_frame(audio_frame);
349 int dropped_frames = 0;
350 if (card->last_timecode != -1) {
351 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
354 // Number of samples per frame if we need to insert silence.
355 // (Could be nonintegral, but resampling will save us then.)
356 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
358 if (dropped_frames > MAX_FPS * 2) {
359 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
360 card_index, card->last_timecode, timecode);
361 audio_mixer.reset_resampler(device);
363 } else if (dropped_frames > 0) {
364 // Insert silence as needed.
365 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
366 card_index, dropped_frames, timecode);
370 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
374 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length);
376 // Done with the audio, so release it.
377 if (audio_frame.owner) {
378 audio_frame.owner->release_frame(audio_frame);
381 card->last_timecode = timecode;
383 size_t expected_length = video_format.width * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom) * 2;
384 if (video_frame.len - video_offset == 0 ||
385 video_frame.len - video_offset != expected_length) {
386 if (video_frame.len != 0) {
387 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
388 card_index, video_frame.len - video_offset, expected_length);
390 if (video_frame.owner) {
391 video_frame.owner->release_frame(video_frame);
394 // Still send on the information that we _had_ a frame, even though it's corrupted,
395 // so that pts can go up accordingly.
397 unique_lock<mutex> lock(card_mutex);
398 CaptureCard::NewFrame new_frame;
399 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
400 new_frame.length = frame_length;
401 new_frame.interlaced = false;
402 new_frame.dropped_frames = dropped_frames;
403 card->new_frames.push(move(new_frame));
404 card->new_frames_changed.notify_all();
409 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
411 unsigned num_fields = video_format.interlaced ? 2 : 1;
412 steady_clock::time_point frame_upload_start;
413 bool interlaced_stride = false;
414 if (video_format.interlaced) {
415 // Send the two fields along as separate frames; the other side will need to add
416 // a deinterlacer to actually get this right.
417 assert(video_format.height % 2 == 0);
418 video_format.height /= 2;
419 assert(frame_length % 2 == 0);
422 if (video_format.second_field_start == 1) {
423 interlaced_stride = true;
425 frame_upload_start = steady_clock::now();
427 userdata->last_interlaced = video_format.interlaced;
428 userdata->last_has_signal = video_format.has_signal;
429 userdata->last_is_connected = video_format.is_connected;
430 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
431 userdata->last_frame_rate_den = video_format.frame_rate_den;
432 RefCountedFrame frame(video_frame);
434 // Upload the textures.
435 size_t cbcr_width = video_format.width / 2;
436 size_t cbcr_offset = video_offset / 2;
437 size_t y_offset = video_frame.size / 2 + video_offset / 2;
439 for (unsigned field = 0; field < num_fields; ++field) {
440 // Put the actual texture upload in a lambda that is executed in the main thread.
441 // It is entirely possible to do this in the same thread (and it might even be
442 // faster, depending on the GPU and driver), but it appears to be trickling
443 // driver bugs very easily.
445 // Note that this means we must hold on to the actual frame data in <userdata>
446 // until the upload command is run, but we hold on to <frame> much longer than that
447 // (in fact, all the way until we no longer use the texture in rendering).
448 auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, interlaced_stride, userdata]() {
449 unsigned field_start_line;
451 field_start_line = video_format.second_field_start;
453 field_start_line = video_format.extra_lines_top;
456 if (userdata->tex_y[field] == 0 ||
457 userdata->tex_cbcr[field] == 0 ||
458 video_format.width != userdata->last_width[field] ||
459 video_format.height != userdata->last_height[field]) {
460 // We changed resolution since last use of this texture, so we need to create
461 // a new object. Note that this each card has its own PBOFrameAllocator,
462 // we don't need to worry about these flip-flopping between resolutions.
463 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
465 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, video_format.height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
467 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
469 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, video_format.width, video_format.height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
471 userdata->last_width[field] = video_format.width;
472 userdata->last_height[field] = video_format.height;
475 GLuint pbo = userdata->pbo;
477 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
480 size_t field_y_start = y_offset + video_format.width * field_start_line;
481 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
483 if (global_flags.flush_pbos) {
484 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_y_start, video_format.width * video_format.height);
486 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_cbcr_start, cbcr_width * video_format.height * sizeof(uint16_t));
490 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
492 if (interlaced_stride) {
493 glPixelStorei(GL_UNPACK_ROW_LENGTH, cbcr_width * 2);
496 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
499 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, video_format.height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_cbcr_start));
501 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
503 if (interlaced_stride) {
504 glPixelStorei(GL_UNPACK_ROW_LENGTH, video_format.width * 2);
507 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
510 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, video_format.width, video_format.height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_y_start));
512 glBindTexture(GL_TEXTURE_2D, 0);
514 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
516 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
521 // Don't upload the second field as fast as we can; wait until
522 // the field time has approximately passed. (Otherwise, we could
523 // get timing jitter against the other sources, and possibly also
524 // against the video display, although the latter is not as critical.)
525 // This requires our system clock to be reasonably close to the
526 // video clock, but that's not an unreasonable assumption.
527 steady_clock::time_point second_field_start = frame_upload_start +
528 nanoseconds(frame_length * 1000000000 / TIMEBASE);
529 this_thread::sleep_until(second_field_start);
533 unique_lock<mutex> lock(card_mutex);
534 CaptureCard::NewFrame new_frame;
535 new_frame.frame = frame;
536 new_frame.length = frame_length;
537 new_frame.field = field;
538 new_frame.interlaced = video_format.interlaced;
539 new_frame.upload_func = upload_func;
540 new_frame.dropped_frames = dropped_frames;
541 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
542 card->new_frames.push(move(new_frame));
543 card->new_frames_changed.notify_all();
548 void Mixer::bm_hotplug_add(libusb_device *dev)
550 lock_guard<mutex> lock(hotplug_mutex);
551 hotplugged_cards.push_back(dev);
554 void Mixer::bm_hotplug_remove(unsigned card_index)
556 cards[card_index].new_frames_changed.notify_all();
559 void Mixer::thread_func()
561 eglBindAPI(EGL_OPENGL_API);
562 QOpenGLContext *context = create_context(mixer_surface);
563 if (!make_current(context, mixer_surface)) {
568 // Start the actual capture. (We don't want to do it before we're actually ready
569 // to process output frames.)
570 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
571 if (int(card_index) != output_card_index) {
572 cards[card_index].capture->start_bm_capture();
576 steady_clock::time_point start, now;
577 start = steady_clock::now();
580 int stats_dropped_frames = 0;
582 while (!should_quit) {
583 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
584 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
586 bool master_card_is_output;
587 unsigned master_card_index;
588 if (output_card_index != -1) {
589 master_card_is_output = true;
590 master_card_index = output_card_index;
592 master_card_is_output = false;
593 master_card_index = theme->map_signal(master_clock_channel);
594 assert(master_card_index < num_cards);
597 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
598 schedule_audio_resampling_tasks(output_frame_info.dropped_frames, output_frame_info.num_samples, output_frame_info.frame_duration);
599 stats_dropped_frames += output_frame_info.dropped_frames;
601 handle_hotplugged_cards();
603 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
604 if (card_index == master_card_index || !has_new_frame[card_index]) {
607 if (new_frames[card_index].frame->len == 0) {
608 ++new_frames[card_index].dropped_frames;
610 if (new_frames[card_index].dropped_frames > 0) {
611 printf("Card %u dropped %d frames before this\n",
612 card_index, int(new_frames[card_index].dropped_frames));
616 // If the first card is reporting a corrupted or otherwise dropped frame,
617 // just increase the pts (skipping over this frame) and don't try to compute anything new.
618 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
619 ++stats_dropped_frames;
620 pts_int += new_frames[master_card_index].length;
624 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
625 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
628 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
629 assert(new_frame->frame != nullptr);
630 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
633 // The new texture might need uploading before use.
634 if (new_frame->upload_func) {
635 new_frame->upload_func();
636 new_frame->upload_func = nullptr;
640 int64_t frame_duration = output_frame_info.frame_duration;
641 render_one_frame(frame_duration);
643 pts_int += frame_duration;
645 now = steady_clock::now();
646 double elapsed = duration<double>(now - start).count();
647 if (frame % 100 == 0) {
648 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
649 frame, stats_dropped_frames, elapsed, frame / elapsed,
650 1e3 * elapsed / frame);
651 // chain->print_phase_timing();
653 // Check our memory usage, to see if we are close to our mlockall()
654 // limit (if at all set).
656 if (getrusage(RUSAGE_SELF, &used) == -1) {
657 perror("getrusage(RUSAGE_SELF)");
663 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
664 perror("getrlimit(RLIMIT_MEMLOCK)");
668 if (limit.rlim_cur == 0) {
669 printf(", using %ld MB memory (locked)",
670 long(used.ru_maxrss / 1024));
672 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
673 long(used.ru_maxrss / 1024),
674 long(limit.rlim_cur / 1048576),
675 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
678 printf(", using %ld MB memory (not locked)",
679 long(used.ru_maxrss / 1024));
686 if (should_cut.exchange(false)) { // Test and clear.
687 video_encoder->do_cut(frame);
691 // Reset every 100 frames, so that local variations in frame times
692 // (especially for the first few frames, when the shaders are
693 // compiled etc.) don't make it hard to measure for the entire
694 // remaining duration of the program.
695 if (frame == 10000) {
703 resource_pool->clean_context();
706 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
708 if (output_card_index != -1) {
709 // The output card (ie., cards[output_card_index].output) is the master clock,
710 // so no input card (ie., cards[card_index].capture) is.
713 return (card_index == master_card_index);
716 Mixer::OutputFrameInfo Mixer::get_one_frame_from_each_card(unsigned master_card_index, bool master_card_is_output, CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS], bool has_new_frame[MAX_VIDEO_CARDS])
718 OutputFrameInfo output_frame_info;
720 unique_lock<mutex> lock(card_mutex, defer_lock);
721 if (master_card_is_output) {
722 // Clocked to the output, so wait for it to be ready for the next frame.
723 cards[master_card_index].output->wait_for_frame(pts_int, &output_frame_info.dropped_frames, &output_frame_info.frame_duration);
726 // Wait for the master card to have a new frame.
727 // TODO: Add a timeout.
729 cards[master_card_index].new_frames_changed.wait(lock, [this, master_card_index]{ return !cards[master_card_index].new_frames.empty() || cards[master_card_index].capture->get_disconnected(); });
732 if (master_card_is_output) {
733 handle_hotplugged_cards();
734 } else if (cards[master_card_index].new_frames.empty()) {
735 // We were woken up, but not due to a new frame. Deal with it
737 assert(cards[master_card_index].capture->get_disconnected());
738 handle_hotplugged_cards();
742 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
743 CaptureCard *card = &cards[card_index];
744 if (card->new_frames.empty()) {
745 assert(!input_card_is_master_clock(card_index, master_card_index));
746 card->queue_length_policy.update_policy(-1);
749 new_frames[card_index] = move(card->new_frames.front());
750 has_new_frame[card_index] = true;
751 card->new_frames.pop();
752 card->new_frames_changed.notify_all();
754 if (input_card_is_master_clock(card_index, master_card_index)) {
755 // We don't use the queue length policy for the master card,
756 // but we will if it stops being the master. Thus, clear out
757 // the policy in case we switch in the future.
758 card->queue_length_policy.reset(card_index);
760 // If we have excess frames compared to the policy for this card,
761 // drop frames from the head.
762 card->queue_length_policy.update_policy(card->new_frames.size());
763 while (card->new_frames.size() > card->queue_length_policy.get_safe_queue_length()) {
764 card->new_frames.pop();
769 if (!master_card_is_output) {
770 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
771 output_frame_info.frame_duration = new_frames[master_card_index].length;
774 // This might get off by a fractional sample when changing master card
775 // between ones with different frame rates, but that's fine.
776 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
777 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
778 fractional_samples = num_samples_times_timebase % TIMEBASE;
779 assert(output_frame_info.num_samples >= 0);
781 return output_frame_info;
784 void Mixer::handle_hotplugged_cards()
786 // Check for cards that have been disconnected since last frame.
787 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
788 CaptureCard *card = &cards[card_index];
789 if (card->capture->get_disconnected()) {
790 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
791 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
792 configure_card(card_index, capture, /*is_fake_capture=*/true, /*output=*/nullptr);
793 card->queue_length_policy.reset(card_index);
794 card->capture->start_bm_capture();
798 // Check for cards that have been connected since last frame.
799 vector<libusb_device *> hotplugged_cards_copy;
801 lock_guard<mutex> lock(hotplug_mutex);
802 swap(hotplugged_cards, hotplugged_cards_copy);
804 for (libusb_device *new_dev : hotplugged_cards_copy) {
805 // Look for a fake capture card where we can stick this in.
806 int free_card_index = -1;
807 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
808 if (cards[card_index].is_fake_capture) {
809 free_card_index = card_index;
814 if (free_card_index == -1) {
815 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
816 libusb_unref_device(new_dev);
818 // BMUSBCapture takes ownership.
819 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
820 CaptureCard *card = &cards[free_card_index];
821 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
822 configure_card(free_card_index, capture, /*is_fake_capture=*/false, /*output=*/nullptr);
823 card->queue_length_policy.reset(free_card_index);
824 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
825 capture->start_bm_capture();
831 void Mixer::schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame)
833 // Resample the audio as needed, including from previously dropped frames.
834 assert(num_cards > 0);
835 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
836 const bool dropped_frame = (frame_num != dropped_frames);
838 // Signal to the audio thread to process this frame.
839 // Note that if the frame is a dropped frame, we signal that
840 // we don't want to use this frame as base for adjusting
841 // the resampler rate. The reason for this is that the timing
842 // of these frames is often way too late; they typically don't
843 // “arrive” before we synthesize them. Thus, we could end up
844 // in a situation where we have inserted e.g. five audio frames
845 // into the queue before we then start pulling five of them
846 // back out. This makes ResamplingQueue overestimate the delay,
847 // causing undue resampler changes. (We _do_ use the last,
848 // non-dropped frame; perhaps we should just discard that as well,
849 // since dropped frames are expected to be rare, and it might be
850 // better to just wait until we have a slightly more normal situation).
851 unique_lock<mutex> lock(audio_mutex);
852 bool adjust_rate = !dropped_frame;
853 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate});
854 audio_task_queue_changed.notify_one();
857 // For dropped frames, increase the pts. Note that if the format changed
858 // in the meantime, we have no way of detecting that; we just have to
859 // assume the frame length is always the same.
860 pts_int += length_per_frame;
865 void Mixer::render_one_frame(int64_t duration)
867 // Get the main chain from the theme, and set its state immediately.
868 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
869 EffectChain *chain = theme_main_chain.chain;
870 theme_main_chain.setup_chain();
871 //theme_main_chain.chain->enable_phase_timing(true);
873 GLuint y_tex, cbcr_tex;
874 bool got_frame = video_encoder->begin_frame(&y_tex, &cbcr_tex);
877 // Render main chain.
878 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, global_flags.width, global_flags.height);
879 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, global_flags.width, global_flags.height); // Saves texture bandwidth, although dithering gets messed up.
880 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
882 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
883 resource_pool->release_fbo(fbo);
885 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
886 if (output_card_index != -1) {
887 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, theme_main_chain.input_frames, pts_int, duration);
889 resource_pool->release_2d_texture(cbcr_full_tex);
891 // Set the right state for rgba_tex.
892 glBindFramebuffer(GL_FRAMEBUFFER, 0);
893 glBindTexture(GL_TEXTURE_2D, rgba_tex);
894 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
895 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
896 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
898 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
899 RefCountedGLsync fence = video_encoder->end_frame(pts_int + av_delay, duration, theme_main_chain.input_frames);
901 // The live frame just shows the RGBA texture we just rendered.
902 // It owns rgba_tex now.
903 DisplayFrame live_frame;
904 live_frame.chain = display_chain.get();
905 live_frame.setup_chain = [this, rgba_tex]{
906 display_input->set_texture_num(rgba_tex);
908 live_frame.ready_fence = fence;
909 live_frame.input_frames = {};
910 live_frame.temp_textures = { rgba_tex };
911 output_channel[OUTPUT_LIVE].output_frame(live_frame);
913 // Set up preview and any additional channels.
914 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
915 DisplayFrame display_frame;
916 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
917 display_frame.chain = chain.chain;
918 display_frame.setup_chain = chain.setup_chain;
919 display_frame.ready_fence = fence;
920 display_frame.input_frames = chain.input_frames;
921 display_frame.temp_textures = {};
922 output_channel[i].output_frame(display_frame);
926 void Mixer::audio_thread_func()
928 while (!should_quit) {
932 unique_lock<mutex> lock(audio_mutex);
933 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
937 task = audio_task_queue.front();
938 audio_task_queue.pop();
941 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
942 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
943 vector<float> samples_out = audio_mixer.get_output(
944 double(task.pts_int) / TIMEBASE,
946 rate_adjustment_policy);
948 // Send the samples to the sound card, then add them to the output.
950 alsa->write(samples_out);
952 if (output_card_index != -1) {
953 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
954 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
956 video_encoder->add_audio(task.pts_int, move(samples_out));
960 void Mixer::release_display_frame(DisplayFrame *frame)
962 for (GLuint texnum : frame->temp_textures) {
963 resource_pool->release_2d_texture(texnum);
965 frame->temp_textures.clear();
966 frame->ready_fence.reset();
967 frame->input_frames.clear();
972 mixer_thread = thread(&Mixer::thread_func, this);
973 audio_thread = thread(&Mixer::audio_thread_func, this);
979 audio_task_queue_changed.notify_one();
984 void Mixer::transition_clicked(int transition_num)
986 theme->transition_clicked(transition_num, pts());
989 void Mixer::channel_clicked(int preview_num)
991 theme->channel_clicked(preview_num);
994 void Mixer::start_mode_scanning(unsigned card_index)
996 assert(card_index < num_cards);
997 if (is_mode_scanning[card_index]) {
1000 is_mode_scanning[card_index] = true;
1001 mode_scanlist[card_index].clear();
1002 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1003 mode_scanlist[card_index].push_back(mode.first);
1005 assert(!mode_scanlist[card_index].empty());
1006 mode_scanlist_index[card_index] = 0;
1007 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1008 last_mode_scan_change[card_index] = steady_clock::now();
1011 Mixer::OutputChannel::~OutputChannel()
1013 if (has_current_frame) {
1014 parent->release_display_frame(¤t_frame);
1016 if (has_ready_frame) {
1017 parent->release_display_frame(&ready_frame);
1021 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1023 // Store this frame for display. Remove the ready frame if any
1024 // (it was seemingly never used).
1026 unique_lock<mutex> lock(frame_mutex);
1027 if (has_ready_frame) {
1028 parent->release_display_frame(&ready_frame);
1030 ready_frame = frame;
1031 has_ready_frame = true;
1034 if (new_frame_ready_callback) {
1035 new_frame_ready_callback();
1038 // Reduce the number of callbacks by filtering duplicates. The reason
1039 // why we bother doing this is that Qt seemingly can get into a state
1040 // where its builds up an essentially unbounded queue of signals,
1041 // consuming more and more memory, and there's no good way of collapsing
1042 // user-defined signals or limiting the length of the queue.
1043 if (transition_names_updated_callback) {
1044 vector<string> transition_names = global_mixer->get_transition_names();
1045 bool changed = false;
1046 if (transition_names.size() != last_transition_names.size()) {
1049 for (unsigned i = 0; i < transition_names.size(); ++i) {
1050 if (transition_names[i] != last_transition_names[i]) {
1057 transition_names_updated_callback(transition_names);
1058 last_transition_names = transition_names;
1061 if (name_updated_callback) {
1062 string name = global_mixer->get_channel_name(channel);
1063 if (name != last_name) {
1064 name_updated_callback(name);
1068 if (color_updated_callback) {
1069 string color = global_mixer->get_channel_color(channel);
1070 if (color != last_color) {
1071 color_updated_callback(color);
1077 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1079 unique_lock<mutex> lock(frame_mutex);
1080 if (!has_current_frame && !has_ready_frame) {
1084 if (has_current_frame && has_ready_frame) {
1085 // We have a new ready frame. Toss the current one.
1086 parent->release_display_frame(¤t_frame);
1087 has_current_frame = false;
1089 if (has_ready_frame) {
1090 assert(!has_current_frame);
1091 current_frame = ready_frame;
1092 ready_frame.ready_fence.reset(); // Drop the refcount.
1093 ready_frame.input_frames.clear(); // Drop the refcounts.
1094 has_current_frame = true;
1095 has_ready_frame = false;
1098 *frame = current_frame;
1102 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1104 new_frame_ready_callback = callback;
1107 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1109 transition_names_updated_callback = callback;
1112 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1114 name_updated_callback = callback;
1117 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1119 color_updated_callback = callback;
1122 mutex RefCountedGLsync::fence_lock;