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>
17 #include <sys/resource.h>
20 #include <condition_variable>
31 #include "DeckLinkAPI.h"
33 #include "alsa_output.h"
34 #include "bmusb/bmusb.h"
35 #include "bmusb/fake_capture.h"
36 #include "chroma_subsampler.h"
38 #include "decklink_capture.h"
39 #include "decklink_output.h"
41 #include "disk_space_estimator.h"
43 #include "input_mapping.h"
44 #include "pbo_frame_allocator.h"
45 #include "ref_counted_gl_sync.h"
46 #include "resampling_queue.h"
48 #include "timecode_renderer.h"
49 #include "v210_converter.h"
50 #include "video_encoder.h"
55 using namespace movit;
57 using namespace std::chrono;
58 using namespace std::placeholders;
59 using namespace bmusb;
61 Mixer *global_mixer = nullptr;
62 bool uses_mlock = false;
66 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
69 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
70 input_state->buffered_frames[card_index][frame_num] =
71 input_state->buffered_frames[card_index][frame_num - 1];
73 input_state->buffered_frames[card_index][0] = { frame, field_num };
75 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
76 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
81 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned v210_width)
84 if (userdata->pixel_format == bmusb::PixelFormat_10BitYCbCr) {
85 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
87 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
91 width != userdata->last_width[field] ||
92 height != userdata->last_height[field]) {
93 // We changed resolution since last use of this texture, so we need to create
94 // a new object. Note that this each card has its own PBOFrameAllocator,
95 // we don't need to worry about these flip-flopping between resolutions.
96 if (userdata->pixel_format == bmusb::PixelFormat_10BitYCbCr) {
97 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
99 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
102 size_t cbcr_width = width / 2;
104 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
106 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
108 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
110 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
113 userdata->last_width[field] = width;
114 userdata->last_height[field] = height;
116 if (global_flags.ten_bit_input &&
117 (first || v210_width != userdata->last_v210_width[field])) {
118 // Same as above; we need to recreate the texture.
119 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
121 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
123 userdata->last_v210_width[field] = v210_width;
127 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
129 if (interlaced_stride) {
132 if (global_flags.flush_pbos) {
133 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
137 glBindTexture(GL_TEXTURE_2D, tex);
139 if (interlaced_stride) {
140 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
143 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
147 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
149 glBindTexture(GL_TEXTURE_2D, 0);
151 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
157 void QueueLengthPolicy::update_policy(unsigned queue_length)
159 if (queue_length == 0) { // Starvation.
160 if (been_at_safe_point_since_last_starvation && safe_queue_length < unsigned(global_flags.max_input_queue_frames)) {
162 fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frame(s)\n",
163 card_index, safe_queue_length);
165 frames_with_at_least_one = 0;
166 been_at_safe_point_since_last_starvation = false;
169 if (queue_length >= safe_queue_length) {
170 been_at_safe_point_since_last_starvation = true;
172 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 1) {
174 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frame(s)\n",
175 card_index, safe_queue_length);
176 frames_with_at_least_one = 0;
180 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
182 num_cards(num_cards),
183 mixer_surface(create_surface(format)),
184 h264_encoder_surface(create_surface(format)),
185 decklink_output_surface(create_surface(format)),
186 audio_mixer(num_cards)
188 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
191 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
192 // will be halved when sampling them, and we need to compensate here.
193 movit_texel_subpixel_precision /= 2.0;
195 resource_pool.reset(new ResourcePool);
196 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
197 output_channel[i].parent = this;
198 output_channel[i].channel = i;
201 ImageFormat inout_format;
202 inout_format.color_space = COLORSPACE_sRGB;
203 inout_format.gamma_curve = GAMMA_sRGB;
205 // Matches the 4:2:0 format created by the main chain.
206 YCbCrFormat ycbcr_format;
207 ycbcr_format.chroma_subsampling_x = 2;
208 ycbcr_format.chroma_subsampling_y = 2;
209 if (global_flags.ycbcr_rec709_coefficients) {
210 ycbcr_format.luma_coefficients = YCBCR_REC_709;
212 ycbcr_format.luma_coefficients = YCBCR_REC_601;
214 ycbcr_format.full_range = false;
215 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
216 ycbcr_format.cb_x_position = 0.0f;
217 ycbcr_format.cr_x_position = 0.0f;
218 ycbcr_format.cb_y_position = 0.5f;
219 ycbcr_format.cr_y_position = 0.5f;
221 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
222 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
224 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
225 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
226 display_chain->add_input(display_input);
227 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
228 display_chain->set_dither_bits(0); // Don't bother.
229 display_chain->finalize();
231 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));
233 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
234 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
236 // Start listening for clients only once VideoEncoder has written its header, if any.
239 // First try initializing the then PCI devices, then USB, then
240 // fill up with fake cards until we have the desired number of cards.
241 unsigned num_pci_devices = 0;
242 unsigned card_index = 0;
245 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
246 if (decklink_iterator != nullptr) {
247 for ( ; card_index < num_cards; ++card_index) {
249 if (decklink_iterator->Next(&decklink) != S_OK) {
253 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
254 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
255 output->set_device(decklink);
256 configure_card(card_index, capture, /*is_fake_capture=*/false, output);
259 decklink_iterator->Release();
260 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
262 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
266 unsigned num_usb_devices = BMUSBCapture::num_cards();
267 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
268 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
269 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
270 configure_card(card_index, capture, /*is_fake_capture=*/false, /*output=*/nullptr);
272 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
274 unsigned num_fake_cards = 0;
275 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
276 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
277 configure_card(card_index, capture, /*is_fake_capture=*/true, /*output=*/nullptr);
280 if (num_fake_cards > 0) {
281 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
284 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
285 BMUSBCapture::start_bm_thread();
287 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
288 cards[card_index].queue_length_policy.reset(card_index);
291 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
293 if (global_flags.ten_bit_input) {
294 if (!v210Converter::has_hardware_support()) {
295 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
296 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
299 v210_converter.reset(new v210Converter());
301 // These are all the widths listed in the Blackmagic SDK documentation
302 // (section 2.7.3, “Display Modes”).
303 v210_converter->precompile_shader(720);
304 v210_converter->precompile_shader(1280);
305 v210_converter->precompile_shader(1920);
306 v210_converter->precompile_shader(2048);
307 v210_converter->precompile_shader(3840);
308 v210_converter->precompile_shader(4096);
310 if (global_flags.ten_bit_output) {
311 if (!v210Converter::has_hardware_support()) {
312 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
313 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
318 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
319 display_timecode_in_stream = global_flags.display_timecode_in_stream;
320 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
322 if (global_flags.enable_alsa_output) {
323 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
325 if (global_flags.output_card != -1) {
326 desired_output_card_index = global_flags.output_card;
327 set_output_card_internal(global_flags.output_card);
333 BMUSBCapture::stop_bm_thread();
335 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
337 unique_lock<mutex> lock(card_mutex);
338 cards[card_index].should_quit = true; // Unblock thread.
339 cards[card_index].new_frames_changed.notify_all();
341 cards[card_index].capture->stop_dequeue_thread();
342 if (cards[card_index].output) {
343 cards[card_index].output->end_output();
344 cards[card_index].output.reset();
348 video_encoder.reset(nullptr);
351 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, bool is_fake_capture, DeckLinkOutput *output)
353 printf("Configuring card %d...\n", card_index);
355 CaptureCard *card = &cards[card_index];
356 if (card->capture != nullptr) {
357 card->capture->stop_dequeue_thread();
359 card->capture.reset(capture);
360 card->is_fake_capture = is_fake_capture;
361 if (card->output.get() != output) {
362 card->output.reset(output);
365 bmusb::PixelFormat pixel_format = global_flags.ten_bit_input ? PixelFormat_10BitYCbCr : PixelFormat_8BitYCbCr;
367 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
368 if (card->frame_allocator == nullptr) {
369 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
371 card->capture->set_video_frame_allocator(card->frame_allocator.get());
372 if (card->surface == nullptr) {
373 card->surface = create_surface_with_same_format(mixer_surface);
375 while (!card->new_frames.empty()) card->new_frames.pop_front();
376 card->last_timecode = -1;
377 card->capture->set_pixel_format(pixel_format);
378 card->capture->configure_card();
380 // NOTE: start_bm_capture() happens in thread_func().
382 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
383 audio_mixer.reset_resampler(device);
384 audio_mixer.set_display_name(device, card->capture->get_description());
385 audio_mixer.trigger_state_changed_callback();
388 void Mixer::set_output_card_internal(int card_index)
390 // We don't really need to take card_mutex, since we're in the mixer
391 // thread and don't mess with any queues (which is the only thing that happens
392 // from other threads), but it's probably the safest in the long run.
393 unique_lock<mutex> lock(card_mutex);
394 if (output_card_index != -1) {
395 // Switch the old card from output to input.
396 CaptureCard *old_card = &cards[output_card_index];
397 old_card->output->end_output();
399 // Stop the fake card that we put into place.
400 // This needs to _not_ happen under the mutex, to avoid deadlock
401 // (delivering the last frame needs to take the mutex).
402 bmusb::CaptureInterface *fake_capture = old_card->capture.get();
404 fake_capture->stop_dequeue_thread();
406 old_card->capture = move(old_card->parked_capture);
407 old_card->is_fake_capture = false;
408 old_card->capture->start_bm_capture();
410 if (card_index != -1) {
411 CaptureCard *card = &cards[card_index];
412 bmusb::CaptureInterface *capture = card->capture.get();
413 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
414 // several seconds to complete (blocking on DisableVideoInput);
415 // see if we can maybe do it asynchronously.
417 capture->stop_dequeue_thread();
419 card->parked_capture = move(card->capture);
420 bmusb::CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
421 configure_card(card_index, fake_capture, /*is_fake_capture=*/true, card->output.release());
422 card->queue_length_policy.reset(card_index);
423 card->capture->start_bm_capture();
424 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
425 card->output->start_output(desired_output_video_mode, pts_int);
427 output_card_index = card_index;
432 int unwrap_timecode(uint16_t current_wrapped, int last)
434 uint16_t last_wrapped = last & 0xffff;
435 if (current_wrapped > last_wrapped) {
436 return (last & ~0xffff) | current_wrapped;
438 return 0x10000 + ((last & ~0xffff) | current_wrapped);
444 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
445 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
446 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
448 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
449 CaptureCard *card = &cards[card_index];
451 if (is_mode_scanning[card_index]) {
452 if (video_format.has_signal) {
453 // Found a stable signal, so stop scanning.
454 is_mode_scanning[card_index] = false;
456 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
457 steady_clock::time_point now = steady_clock::now();
458 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
459 if (sec_since_last_switch > switch_time_s) {
460 // It isn't this mode; try the next one.
461 mode_scanlist_index[card_index]++;
462 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
463 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
464 last_mode_scan_change[card_index] = now;
469 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
470 assert(frame_length > 0);
472 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;
473 if (num_samples > OUTPUT_FREQUENCY / 10) {
474 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",
475 card_index, int(audio_frame.len), int(audio_offset),
476 timecode, int(video_frame.len), int(video_offset), video_format.id);
477 if (video_frame.owner) {
478 video_frame.owner->release_frame(video_frame);
480 if (audio_frame.owner) {
481 audio_frame.owner->release_frame(audio_frame);
486 int dropped_frames = 0;
487 if (card->last_timecode != -1) {
488 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
491 // Number of samples per frame if we need to insert silence.
492 // (Could be nonintegral, but resampling will save us then.)
493 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
495 if (dropped_frames > MAX_FPS * 2) {
496 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
497 card_index, card->last_timecode, timecode);
498 audio_mixer.reset_resampler(device);
500 } else if (dropped_frames > 0) {
501 // Insert silence as needed.
502 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
503 card_index, dropped_frames, timecode);
507 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
511 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
513 // Done with the audio, so release it.
514 if (audio_frame.owner) {
515 audio_frame.owner->release_frame(audio_frame);
518 card->last_timecode = timecode;
520 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
521 if (video_frame.len - video_offset == 0 ||
522 video_frame.len - video_offset != expected_length) {
523 if (video_frame.len != 0) {
524 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
525 card_index, video_frame.len - video_offset, expected_length);
527 if (video_frame.owner) {
528 video_frame.owner->release_frame(video_frame);
531 // Still send on the information that we _had_ a frame, even though it's corrupted,
532 // so that pts can go up accordingly.
534 unique_lock<mutex> lock(card_mutex);
535 CaptureCard::NewFrame new_frame;
536 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
537 new_frame.length = frame_length;
538 new_frame.interlaced = false;
539 new_frame.dropped_frames = dropped_frames;
540 new_frame.received_timestamp = video_frame.received_timestamp;
541 card->new_frames.push_back(move(new_frame));
542 card->new_frames_changed.notify_all();
547 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
549 unsigned num_fields = video_format.interlaced ? 2 : 1;
550 steady_clock::time_point frame_upload_start;
551 bool interlaced_stride = false;
552 if (video_format.interlaced) {
553 // Send the two fields along as separate frames; the other side will need to add
554 // a deinterlacer to actually get this right.
555 assert(video_format.height % 2 == 0);
556 video_format.height /= 2;
557 assert(frame_length % 2 == 0);
560 if (video_format.second_field_start == 1) {
561 interlaced_stride = true;
563 frame_upload_start = steady_clock::now();
565 userdata->last_interlaced = video_format.interlaced;
566 userdata->last_has_signal = video_format.has_signal;
567 userdata->last_is_connected = video_format.is_connected;
568 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
569 userdata->last_frame_rate_den = video_format.frame_rate_den;
570 RefCountedFrame frame(video_frame);
572 // Upload the textures.
573 const size_t cbcr_width = video_format.width / 2;
574 const size_t cbcr_offset = video_offset / 2;
575 const size_t y_offset = video_frame.size / 2 + video_offset / 2;
577 for (unsigned field = 0; field < num_fields; ++field) {
578 // Put the actual texture upload in a lambda that is executed in the main thread.
579 // It is entirely possible to do this in the same thread (and it might even be
580 // faster, depending on the GPU and driver), but it appears to be trickling
581 // driver bugs very easily.
583 // Note that this means we must hold on to the actual frame data in <userdata>
584 // until the upload command is run, but we hold on to <frame> much longer than that
585 // (in fact, all the way until we no longer use the texture in rendering).
586 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, interlaced_stride, userdata]() {
587 unsigned field_start_line;
589 field_start_line = video_format.second_field_start;
591 field_start_line = video_format.extra_lines_top;
594 // For 8-bit input, v210_width will be nonsensical but not used.
595 size_t v210_width = video_format.stride / sizeof(uint32_t);
596 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, v210_width);
598 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
601 if (userdata->pixel_format == bmusb::PixelFormat_10BitYCbCr) {
602 size_t field_start = video_offset + video_format.stride * field_start_line;
603 upload_texture(userdata->tex_v210[field], v210_width, video_format.height, video_format.stride, interlaced_stride, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, field_start);
604 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
606 size_t field_y_start = y_offset + video_format.width * field_start_line;
607 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
609 // Make up our own strides, since we are interleaving.
610 upload_texture(userdata->tex_y[field], video_format.width, video_format.height, video_format.width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_y_start);
611 upload_texture(userdata->tex_cbcr[field], cbcr_width, video_format.height, cbcr_width * sizeof(uint16_t), interlaced_stride, GL_RG, GL_UNSIGNED_BYTE, field_cbcr_start);
614 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
619 // Don't upload the second field as fast as we can; wait until
620 // the field time has approximately passed. (Otherwise, we could
621 // get timing jitter against the other sources, and possibly also
622 // against the video display, although the latter is not as critical.)
623 // This requires our system clock to be reasonably close to the
624 // video clock, but that's not an unreasonable assumption.
625 steady_clock::time_point second_field_start = frame_upload_start +
626 nanoseconds(frame_length * 1000000000 / TIMEBASE);
627 this_thread::sleep_until(second_field_start);
631 unique_lock<mutex> lock(card_mutex);
632 CaptureCard::NewFrame new_frame;
633 new_frame.frame = frame;
634 new_frame.length = frame_length;
635 new_frame.field = field;
636 new_frame.interlaced = video_format.interlaced;
637 new_frame.upload_func = upload_func;
638 new_frame.dropped_frames = dropped_frames;
639 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
640 card->new_frames.push_back(move(new_frame));
641 card->new_frames_changed.notify_all();
646 void Mixer::bm_hotplug_add(libusb_device *dev)
648 lock_guard<mutex> lock(hotplug_mutex);
649 hotplugged_cards.push_back(dev);
652 void Mixer::bm_hotplug_remove(unsigned card_index)
654 cards[card_index].new_frames_changed.notify_all();
657 void Mixer::thread_func()
659 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
661 eglBindAPI(EGL_OPENGL_API);
662 QOpenGLContext *context = create_context(mixer_surface);
663 if (!make_current(context, mixer_surface)) {
668 // Start the actual capture. (We don't want to do it before we're actually ready
669 // to process output frames.)
670 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
671 if (int(card_index) != output_card_index) {
672 cards[card_index].capture->start_bm_capture();
676 steady_clock::time_point start, now;
677 start = steady_clock::now();
679 int stats_dropped_frames = 0;
681 while (!should_quit) {
682 if (desired_output_card_index != output_card_index) {
683 set_output_card_internal(desired_output_card_index);
685 if (output_card_index != -1 &&
686 desired_output_video_mode != output_video_mode) {
687 DeckLinkOutput *output = cards[output_card_index].output.get();
688 output->end_output();
689 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
690 output->start_output(desired_output_video_mode, pts_int);
693 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
694 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
696 bool master_card_is_output;
697 unsigned master_card_index;
698 if (output_card_index != -1) {
699 master_card_is_output = true;
700 master_card_index = output_card_index;
702 master_card_is_output = false;
703 master_card_index = theme->map_signal(master_clock_channel);
704 assert(master_card_index < num_cards);
707 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
708 schedule_audio_resampling_tasks(output_frame_info.dropped_frames, output_frame_info.num_samples, output_frame_info.frame_duration, output_frame_info.is_preroll, output_frame_info.frame_timestamp);
709 stats_dropped_frames += output_frame_info.dropped_frames;
711 handle_hotplugged_cards();
713 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
714 if (card_index == master_card_index || !has_new_frame[card_index]) {
717 if (new_frames[card_index].frame->len == 0) {
718 ++new_frames[card_index].dropped_frames;
720 if (new_frames[card_index].dropped_frames > 0) {
721 printf("Card %u dropped %d frames before this\n",
722 card_index, int(new_frames[card_index].dropped_frames));
726 // If the first card is reporting a corrupted or otherwise dropped frame,
727 // just increase the pts (skipping over this frame) and don't try to compute anything new.
728 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
729 ++stats_dropped_frames;
730 pts_int += new_frames[master_card_index].length;
734 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
735 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
738 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
739 assert(new_frame->frame != nullptr);
740 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
743 // The new texture might need uploading before use.
744 if (new_frame->upload_func) {
745 new_frame->upload_func();
746 new_frame->upload_func = nullptr;
750 int64_t frame_duration = output_frame_info.frame_duration;
751 render_one_frame(frame_duration);
753 pts_int += frame_duration;
755 now = steady_clock::now();
756 double elapsed = duration<double>(now - start).count();
757 if (frame_num % 100 == 0) {
758 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
759 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
760 1e3 * elapsed / frame_num);
761 // chain->print_phase_timing();
763 // Check our memory usage, to see if we are close to our mlockall()
764 // limit (if at all set).
766 if (getrusage(RUSAGE_SELF, &used) == -1) {
767 perror("getrusage(RUSAGE_SELF)");
773 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
774 perror("getrlimit(RLIMIT_MEMLOCK)");
778 if (limit.rlim_cur == 0) {
779 printf(", using %ld MB memory (locked)",
780 long(used.ru_maxrss / 1024));
782 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
783 long(used.ru_maxrss / 1024),
784 long(limit.rlim_cur / 1048576),
785 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
788 printf(", using %ld MB memory (not locked)",
789 long(used.ru_maxrss / 1024));
796 if (should_cut.exchange(false)) { // Test and clear.
797 video_encoder->do_cut(frame_num);
801 // Reset every 100 frames, so that local variations in frame times
802 // (especially for the first few frames, when the shaders are
803 // compiled etc.) don't make it hard to measure for the entire
804 // remaining duration of the program.
805 if (frame == 10000) {
813 resource_pool->clean_context();
816 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
818 if (output_card_index != -1) {
819 // The output card (ie., cards[output_card_index].output) is the master clock,
820 // so no input card (ie., cards[card_index].capture) is.
823 return (card_index == master_card_index);
826 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
828 // Count the number of frames in the queue, including any frames
829 // we dropped. It's hard to know exactly how we should deal with
830 // dropped (corrupted) input frames; they don't help our goal of
831 // avoiding starvation, but they still add to the problem of latency.
832 // Since dropped frames is going to mean a bump in the signal anyway,
833 // we err on the side of having more stable latency instead.
834 unsigned queue_length = 0;
835 for (const CaptureCard::NewFrame &frame : card->new_frames) {
836 queue_length += frame.dropped_frames + 1;
838 card->queue_length_policy.update_policy(queue_length);
840 // If needed, drop frames until the queue is below the safe limit.
841 // We prefer to drop from the head, because all else being equal,
842 // we'd like more recent frames (less latency).
843 unsigned dropped_frames = 0;
844 while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
845 assert(!card->new_frames.empty());
846 assert(queue_length > card->new_frames.front().dropped_frames);
847 queue_length -= card->new_frames.front().dropped_frames;
849 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
850 // No need to drop anything.
854 card->new_frames.pop_front();
855 card->new_frames_changed.notify_all();
861 if (dropped_frames > 0) {
862 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
863 card_index, dropped_frames);
869 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])
871 OutputFrameInfo output_frame_info;
873 unique_lock<mutex> lock(card_mutex, defer_lock);
874 if (master_card_is_output) {
875 // Clocked to the output, so wait for it to be ready for the next frame.
876 cards[master_card_index].output->wait_for_frame(pts_int, &output_frame_info.dropped_frames, &output_frame_info.frame_duration, &output_frame_info.is_preroll, &output_frame_info.frame_timestamp);
879 // Wait for the master card to have a new frame.
880 // TODO: Add a timeout.
881 output_frame_info.is_preroll = false;
883 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(); });
886 if (master_card_is_output) {
887 handle_hotplugged_cards();
888 } else if (cards[master_card_index].new_frames.empty()) {
889 // We were woken up, but not due to a new frame. Deal with it
891 assert(cards[master_card_index].capture->get_disconnected());
892 handle_hotplugged_cards();
896 if (!master_card_is_output) {
897 output_frame_info.frame_timestamp =
898 cards[master_card_index].new_frames.front().received_timestamp;
901 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
902 CaptureCard *card = &cards[card_index];
903 if (input_card_is_master_clock(card_index, master_card_index)) {
904 // We don't use the queue length policy for the master card,
905 // but we will if it stops being the master. Thus, clear out
906 // the policy in case we switch in the future.
907 card->queue_length_policy.reset(card_index);
908 assert(!card->new_frames.empty());
910 trim_queue(card, card_index);
912 if (!card->new_frames.empty()) {
913 new_frames[card_index] = move(card->new_frames.front());
914 has_new_frame[card_index] = true;
915 card->new_frames.pop_front();
916 card->new_frames_changed.notify_all();
920 if (!master_card_is_output) {
921 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
922 output_frame_info.frame_duration = new_frames[master_card_index].length;
925 // This might get off by a fractional sample when changing master card
926 // between ones with different frame rates, but that's fine.
927 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
928 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
929 fractional_samples = num_samples_times_timebase % TIMEBASE;
930 assert(output_frame_info.num_samples >= 0);
932 return output_frame_info;
935 void Mixer::handle_hotplugged_cards()
937 // Check for cards that have been disconnected since last frame.
938 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
939 CaptureCard *card = &cards[card_index];
940 if (card->capture->get_disconnected()) {
941 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
942 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
943 configure_card(card_index, capture, /*is_fake_capture=*/true, /*output=*/nullptr);
944 card->queue_length_policy.reset(card_index);
945 card->capture->start_bm_capture();
949 // Check for cards that have been connected since last frame.
950 vector<libusb_device *> hotplugged_cards_copy;
952 lock_guard<mutex> lock(hotplug_mutex);
953 swap(hotplugged_cards, hotplugged_cards_copy);
955 for (libusb_device *new_dev : hotplugged_cards_copy) {
956 // Look for a fake capture card where we can stick this in.
957 int free_card_index = -1;
958 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
959 if (cards[card_index].is_fake_capture) {
960 free_card_index = card_index;
965 if (free_card_index == -1) {
966 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
967 libusb_unref_device(new_dev);
969 // BMUSBCapture takes ownership.
970 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
971 CaptureCard *card = &cards[free_card_index];
972 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
973 configure_card(free_card_index, capture, /*is_fake_capture=*/false, /*output=*/nullptr);
974 card->queue_length_policy.reset(free_card_index);
975 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
976 capture->start_bm_capture();
982 void Mixer::schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame, bool is_preroll, steady_clock::time_point frame_timestamp)
984 // Resample the audio as needed, including from previously dropped frames.
985 assert(num_cards > 0);
986 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
987 const bool dropped_frame = (frame_num != dropped_frames);
989 // Signal to the audio thread to process this frame.
990 // Note that if the frame is a dropped frame, we signal that
991 // we don't want to use this frame as base for adjusting
992 // the resampler rate. The reason for this is that the timing
993 // of these frames is often way too late; they typically don't
994 // “arrive” before we synthesize them. Thus, we could end up
995 // in a situation where we have inserted e.g. five audio frames
996 // into the queue before we then start pulling five of them
997 // back out. This makes ResamplingQueue overestimate the delay,
998 // causing undue resampler changes. (We _do_ use the last,
999 // non-dropped frame; perhaps we should just discard that as well,
1000 // since dropped frames are expected to be rare, and it might be
1001 // better to just wait until we have a slightly more normal situation).
1002 unique_lock<mutex> lock(audio_mutex);
1003 bool adjust_rate = !dropped_frame && !is_preroll;
1004 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1005 audio_task_queue_changed.notify_one();
1007 if (dropped_frame) {
1008 // For dropped frames, increase the pts. Note that if the format changed
1009 // in the meantime, we have no way of detecting that; we just have to
1010 // assume the frame length is always the same.
1011 pts_int += length_per_frame;
1016 void Mixer::render_one_frame(int64_t duration)
1018 // Determine the time code for this frame before we start rendering.
1019 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1020 if (display_timecode_on_stdout) {
1021 printf("Timecode: '%s'\n", timecode_text.c_str());
1024 // Get the main chain from the theme, and set its state immediately.
1025 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1026 EffectChain *chain = theme_main_chain.chain;
1027 theme_main_chain.setup_chain();
1028 //theme_main_chain.chain->enable_phase_timing(true);
1030 // If HDMI/SDI output is active and the user has requested auto mode,
1031 // its mode overrides the existing Y'CbCr setting for the chain.
1032 YCbCrLumaCoefficients ycbcr_output_coefficients;
1033 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1034 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1036 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1039 // TODO: Reduce the duplication against theme.cpp.
1040 YCbCrFormat output_ycbcr_format;
1041 output_ycbcr_format.chroma_subsampling_x = 1;
1042 output_ycbcr_format.chroma_subsampling_y = 1;
1043 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1044 output_ycbcr_format.full_range = false;
1045 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1046 chain->change_ycbcr_output_format(output_ycbcr_format);
1048 // Render main chain. If we're using zerocopy Quick Sync encoding
1049 // (the default case), we take an extra copy of the created outputs,
1050 // so that we can display it back to the screen later (it's less memory
1051 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1052 // Ideally, we'd like to avoid taking copies and just use the main textures
1053 // for display as well, but they're just views into VA-API memory and must be
1054 // unmapped during encoding, so we can't use them for display, unfortunately.
1055 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1056 GLuint y_copy_tex, cbcr_copy_tex = 0;
1057 GLuint y_display_tex, cbcr_display_tex;
1058 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1059 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1060 const bool is_zerocopy = video_encoder->is_zerocopy();
1062 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1063 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1064 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1066 y_display_tex = y_copy_tex;
1067 cbcr_display_tex = cbcr_copy_tex;
1069 // y_tex and cbcr_tex will be given by VideoEncoder.
1071 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1072 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1073 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1075 y_display_tex = y_tex;
1076 cbcr_display_tex = cbcr_tex;
1079 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1080 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1085 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1087 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1090 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1092 if (display_timecode_in_stream) {
1093 // Render the timecode on top.
1094 timecode_renderer->render_timecode(fbo, timecode_text);
1097 resource_pool->release_fbo(fbo);
1100 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1102 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1104 if (output_card_index != -1) {
1105 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1107 resource_pool->release_2d_texture(cbcr_full_tex);
1109 // Set the right state for the Y' and CbCr textures we use for display.
1110 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1111 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1112 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1113 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1114 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1116 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1117 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1118 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1119 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1121 RefCountedGLsync fence = video_encoder->end_frame();
1123 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1124 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1125 DisplayFrame live_frame;
1126 live_frame.chain = display_chain.get();
1127 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1128 display_input->set_texture_num(0, y_display_tex);
1129 display_input->set_texture_num(1, cbcr_display_tex);
1131 live_frame.ready_fence = fence;
1132 live_frame.input_frames = {};
1133 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1134 output_channel[OUTPUT_LIVE].output_frame(live_frame);
1136 // Set up preview and any additional channels.
1137 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1138 DisplayFrame display_frame;
1139 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1140 display_frame.chain = chain.chain;
1141 display_frame.setup_chain = chain.setup_chain;
1142 display_frame.ready_fence = fence;
1143 display_frame.input_frames = chain.input_frames;
1144 display_frame.temp_textures = {};
1145 output_channel[i].output_frame(display_frame);
1149 void Mixer::audio_thread_func()
1151 pthread_setname_np(pthread_self(), "Mixer_Audio");
1153 while (!should_quit) {
1157 unique_lock<mutex> lock(audio_mutex);
1158 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1162 task = audio_task_queue.front();
1163 audio_task_queue.pop();
1166 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1167 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1168 vector<float> samples_out = audio_mixer.get_output(
1169 task.frame_timestamp,
1171 rate_adjustment_policy);
1173 // Send the samples to the sound card, then add them to the output.
1175 alsa->write(samples_out);
1177 if (output_card_index != -1) {
1178 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1179 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1181 video_encoder->add_audio(task.pts_int, move(samples_out));
1185 void Mixer::release_display_frame(DisplayFrame *frame)
1187 for (GLuint texnum : frame->temp_textures) {
1188 resource_pool->release_2d_texture(texnum);
1190 frame->temp_textures.clear();
1191 frame->ready_fence.reset();
1192 frame->input_frames.clear();
1197 mixer_thread = thread(&Mixer::thread_func, this);
1198 audio_thread = thread(&Mixer::audio_thread_func, this);
1204 audio_task_queue_changed.notify_one();
1205 mixer_thread.join();
1206 audio_thread.join();
1209 void Mixer::transition_clicked(int transition_num)
1211 theme->transition_clicked(transition_num, pts());
1214 void Mixer::channel_clicked(int preview_num)
1216 theme->channel_clicked(preview_num);
1219 void Mixer::start_mode_scanning(unsigned card_index)
1221 assert(card_index < num_cards);
1222 if (is_mode_scanning[card_index]) {
1225 is_mode_scanning[card_index] = true;
1226 mode_scanlist[card_index].clear();
1227 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1228 mode_scanlist[card_index].push_back(mode.first);
1230 assert(!mode_scanlist[card_index].empty());
1231 mode_scanlist_index[card_index] = 0;
1232 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1233 last_mode_scan_change[card_index] = steady_clock::now();
1236 map<uint32_t, bmusb::VideoMode> Mixer::get_available_output_video_modes() const
1238 assert(desired_output_card_index != -1);
1239 unique_lock<mutex> lock(card_mutex);
1240 return cards[desired_output_card_index].output->get_available_video_modes();
1243 Mixer::OutputChannel::~OutputChannel()
1245 if (has_current_frame) {
1246 parent->release_display_frame(¤t_frame);
1248 if (has_ready_frame) {
1249 parent->release_display_frame(&ready_frame);
1253 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1255 // Store this frame for display. Remove the ready frame if any
1256 // (it was seemingly never used).
1258 unique_lock<mutex> lock(frame_mutex);
1259 if (has_ready_frame) {
1260 parent->release_display_frame(&ready_frame);
1262 ready_frame = frame;
1263 has_ready_frame = true;
1266 if (new_frame_ready_callback) {
1267 new_frame_ready_callback();
1270 // Reduce the number of callbacks by filtering duplicates. The reason
1271 // why we bother doing this is that Qt seemingly can get into a state
1272 // where its builds up an essentially unbounded queue of signals,
1273 // consuming more and more memory, and there's no good way of collapsing
1274 // user-defined signals or limiting the length of the queue.
1275 if (transition_names_updated_callback) {
1276 vector<string> transition_names = global_mixer->get_transition_names();
1277 bool changed = false;
1278 if (transition_names.size() != last_transition_names.size()) {
1281 for (unsigned i = 0; i < transition_names.size(); ++i) {
1282 if (transition_names[i] != last_transition_names[i]) {
1289 transition_names_updated_callback(transition_names);
1290 last_transition_names = transition_names;
1293 if (name_updated_callback) {
1294 string name = global_mixer->get_channel_name(channel);
1295 if (name != last_name) {
1296 name_updated_callback(name);
1300 if (color_updated_callback) {
1301 string color = global_mixer->get_channel_color(channel);
1302 if (color != last_color) {
1303 color_updated_callback(color);
1309 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1311 unique_lock<mutex> lock(frame_mutex);
1312 if (!has_current_frame && !has_ready_frame) {
1316 if (has_current_frame && has_ready_frame) {
1317 // We have a new ready frame. Toss the current one.
1318 parent->release_display_frame(¤t_frame);
1319 has_current_frame = false;
1321 if (has_ready_frame) {
1322 assert(!has_current_frame);
1323 current_frame = ready_frame;
1324 ready_frame.ready_fence.reset(); // Drop the refcount.
1325 ready_frame.input_frames.clear(); // Drop the refcounts.
1326 has_current_frame = true;
1327 has_ready_frame = false;
1330 *frame = current_frame;
1334 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1336 new_frame_ready_callback = callback;
1339 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1341 transition_names_updated_callback = callback;
1344 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1346 name_updated_callback = callback;
1349 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1351 color_updated_callback = callback;
1354 mutex RefCountedGLsync::fence_lock;