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>
19 #include <condition_variable>
30 #include "DeckLinkAPI.h"
32 #include "alsa_output.h"
33 #include "basic_stats.h"
34 #include "bmusb/bmusb.h"
35 #include "bmusb/fake_capture.h"
36 #include "cef_capture.h"
37 #include "chroma_subsampler.h"
39 #include "decklink_capture.h"
40 #include "decklink_output.h"
42 #include "disk_space_estimator.h"
43 #include "ffmpeg_capture.h"
45 #include "input_mapping.h"
47 #include "pbo_frame_allocator.h"
48 #include "ref_counted_gl_sync.h"
49 #include "resampling_queue.h"
51 #include "timecode_renderer.h"
52 #include "v210_converter.h"
53 #include "video_encoder.h"
56 #include <google/protobuf/util/json_util.h>
62 using namespace movit;
64 using namespace std::chrono;
65 using namespace std::placeholders;
66 using namespace bmusb;
68 Mixer *global_mixer = nullptr;
72 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
75 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
76 input_state->buffered_frames[card_index][frame_num] =
77 input_state->buffered_frames[card_index][frame_num - 1];
79 input_state->buffered_frames[card_index][0] = { frame, field_num };
81 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
82 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
87 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
90 switch (userdata->pixel_format) {
91 case PixelFormat_10BitYCbCr:
92 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
94 case PixelFormat_8BitYCbCr:
95 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
97 case PixelFormat_8BitBGRA:
98 first = userdata->tex_rgba[field] == 0;
100 case PixelFormat_8BitYCbCrPlanar:
101 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
108 width != userdata->last_width[field] ||
109 height != userdata->last_height[field] ||
110 cbcr_width != userdata->last_cbcr_width[field] ||
111 cbcr_height != userdata->last_cbcr_height[field]) {
112 // We changed resolution since last use of this texture, so we need to create
113 // a new object. Note that this each card has its own PBOFrameAllocator,
114 // we don't need to worry about these flip-flopping between resolutions.
115 switch (userdata->pixel_format) {
116 case PixelFormat_10BitYCbCr:
117 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
119 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
122 case PixelFormat_8BitYCbCr: {
123 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
125 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
127 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
129 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
133 case PixelFormat_8BitYCbCrPlanar: {
134 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
136 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
138 glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
140 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
142 glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
144 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
148 case PixelFormat_8BitBGRA:
149 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
151 if (global_flags.can_disable_srgb_decoder) { // See the comments in tweaked_inputs.h.
152 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
154 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
159 userdata->last_width[field] = width;
160 userdata->last_height[field] = height;
161 userdata->last_cbcr_width[field] = cbcr_width;
162 userdata->last_cbcr_height[field] = cbcr_height;
164 if (global_flags.ten_bit_input &&
165 (first || v210_width != userdata->last_v210_width[field])) {
166 // Same as above; we need to recreate the texture.
167 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
169 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
171 userdata->last_v210_width[field] = v210_width;
175 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
177 if (interlaced_stride) {
180 if (global_flags.flush_pbos) {
181 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
185 glBindTexture(GL_TEXTURE_2D, tex);
187 if (interlaced_stride) {
188 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
191 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
195 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
197 glBindTexture(GL_TEXTURE_2D, 0);
199 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
205 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
207 global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
208 global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
211 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
213 global_metrics.remove("input_underestimated_jitter_frames", labels);
214 global_metrics.remove("input_estimated_max_jitter_seconds", labels);
217 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
219 if (expected_timestamp > steady_clock::time_point::min()) {
220 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
221 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
222 history.push_back(orders.insert(jitter_seconds));
223 if (jitter_seconds > estimate_max_jitter()) {
224 ++metric_input_underestimated_jitter_frames;
227 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
229 if (history.size() > history_length) {
230 orders.erase(history.front());
233 assert(history.size() <= history_length);
235 expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
238 double JitterHistory::estimate_max_jitter() const
240 if (orders.empty()) {
243 size_t elem_idx = lrint((orders.size() - 1) * percentile);
244 if (percentile <= 0.5) {
245 return *next(orders.begin(), elem_idx) * multiplier;
247 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
251 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
253 global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
256 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
258 global_metrics.remove("input_queue_safe_length_frames", labels);
261 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
262 steady_clock::time_point expected_next_frame,
263 int64_t input_frame_duration,
264 int64_t master_frame_duration,
265 double max_input_card_jitter_seconds,
266 double max_master_card_jitter_seconds)
268 double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
269 double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
271 // Figure out when we can expect the next frame for this card, assuming
272 // worst-case jitter (ie., the frame is maximally late).
273 double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
275 // How many times are the master card expected to tick in that time?
276 // We assume the master clock has worst-case jitter but not any rate
277 // discrepancy, ie., it ticks as early as possible every time, but not
279 double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
281 // As a special case, if the master card ticks faster than the input card,
282 // we expect the queue to drain by itself even without dropping. But if
283 // the difference is small (e.g. 60 Hz master and 59.94 input), it would
284 // go slowly enough that the effect wouldn't really be appreciable.
285 // We account for this by looking at the situation five frames ahead,
286 // assuming everything else is the same.
287 double frames_allowed;
288 if (master_frame_duration < input_frame_duration) {
289 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
291 frames_allowed = frames_needed;
294 safe_queue_length = max<int>(floor(frames_allowed), 0);
295 metric_input_queue_safe_length_frames = safe_queue_length;
298 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
300 num_cards(num_cards),
301 mixer_surface(create_surface(format)),
302 h264_encoder_surface(create_surface(format)),
303 decklink_output_surface(create_surface(format)),
304 audio_mixer(num_cards)
306 memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
307 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
310 // This nearly always should be true.
311 global_flags.can_disable_srgb_decoder =
312 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
313 epoxy_has_gl_extension("GL_ARB_sampler_objects");
315 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
316 // will be halved when sampling them, and we need to compensate here.
317 movit_texel_subpixel_precision /= 2.0;
319 resource_pool.reset(new ResourcePool);
320 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
321 output_channel[i].parent = this;
322 output_channel[i].channel = i;
325 ImageFormat inout_format;
326 inout_format.color_space = COLORSPACE_sRGB;
327 inout_format.gamma_curve = GAMMA_sRGB;
329 // Matches the 4:2:0 format created by the main chain.
330 YCbCrFormat ycbcr_format;
331 ycbcr_format.chroma_subsampling_x = 2;
332 ycbcr_format.chroma_subsampling_y = 2;
333 if (global_flags.ycbcr_rec709_coefficients) {
334 ycbcr_format.luma_coefficients = YCBCR_REC_709;
336 ycbcr_format.luma_coefficients = YCBCR_REC_601;
338 ycbcr_format.full_range = false;
339 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
340 ycbcr_format.cb_x_position = 0.0f;
341 ycbcr_format.cr_x_position = 0.0f;
342 ycbcr_format.cb_y_position = 0.5f;
343 ycbcr_format.cr_y_position = 0.5f;
345 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
346 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
348 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
349 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
350 display_chain->add_input(display_input);
351 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
352 display_chain->set_dither_bits(0); // Don't bother.
353 display_chain->finalize();
355 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));
357 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
358 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
360 httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
361 for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
363 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx);
364 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx)), HTTPD::ALLOW_ALL_ORIGINS);
367 // Start listening for clients only once VideoEncoder has written its header, if any.
368 httpd.start(global_flags.http_port);
370 // First try initializing the then PCI devices, then USB, then
371 // fill up with fake cards until we have the desired number of cards.
372 unsigned num_pci_devices = 0;
373 unsigned card_index = 0;
376 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
377 if (decklink_iterator != nullptr) {
378 for ( ; card_index < num_cards; ++card_index) {
380 if (decklink_iterator->Next(&decklink) != S_OK) {
384 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
385 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
386 if (!output->set_device(decklink)) {
390 configure_card(card_index, capture, CardType::LIVE_CARD, output);
393 decklink_iterator->Release();
394 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
396 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
400 unsigned num_usb_devices = BMUSBCapture::num_cards();
401 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
402 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
403 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
404 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
406 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
408 unsigned num_fake_cards = 0;
409 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
410 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
411 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
414 if (num_fake_cards > 0) {
415 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
418 // Initialize all video inputs the theme asked for. Note that these are
419 // all put _after_ the regular cards, which stop at <num_cards> - 1.
420 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
421 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
422 if (card_index >= MAX_VIDEO_CARDS) {
423 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
426 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
427 video_inputs[video_card_index]->set_card_index(card_index);
429 num_video_inputs = video_inputs.size();
431 // Same, for HTML inputs.
432 std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
433 for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
434 if (card_index >= MAX_VIDEO_CARDS) {
435 fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
438 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr);
439 html_inputs[html_card_index]->set_card_index(card_index);
441 num_html_inputs = html_inputs.size();
443 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
444 BMUSBCapture::start_bm_thread();
446 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
447 cards[card_index].queue_length_policy.reset(card_index);
450 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
452 if (global_flags.ten_bit_input) {
453 if (!v210Converter::has_hardware_support()) {
454 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
455 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
458 v210_converter.reset(new v210Converter());
460 // These are all the widths listed in the Blackmagic SDK documentation
461 // (section 2.7.3, “Display Modes”).
462 v210_converter->precompile_shader(720);
463 v210_converter->precompile_shader(1280);
464 v210_converter->precompile_shader(1920);
465 v210_converter->precompile_shader(2048);
466 v210_converter->precompile_shader(3840);
467 v210_converter->precompile_shader(4096);
469 if (global_flags.ten_bit_output) {
470 if (!v210Converter::has_hardware_support()) {
471 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
472 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
477 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
478 display_timecode_in_stream = global_flags.display_timecode_in_stream;
479 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
481 if (global_flags.enable_alsa_output) {
482 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
484 if (global_flags.output_card != -1) {
485 desired_output_card_index = global_flags.output_card;
486 set_output_card_internal(global_flags.output_card);
489 output_jitter_history.register_metrics({{ "card", "output" }});
494 BMUSBCapture::stop_bm_thread();
496 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
498 unique_lock<mutex> lock(card_mutex);
499 cards[card_index].should_quit = true; // Unblock thread.
500 cards[card_index].new_frames_changed.notify_all();
502 cards[card_index].capture->stop_dequeue_thread();
503 if (cards[card_index].output) {
504 cards[card_index].output->end_output();
505 cards[card_index].output.reset();
509 video_encoder.reset(nullptr);
512 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
514 printf("Configuring card %d...\n", card_index);
516 CaptureCard *card = &cards[card_index];
517 if (card->capture != nullptr) {
518 card->capture->stop_dequeue_thread();
520 card->capture.reset(capture);
521 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
522 card->type = card_type;
523 if (card->output.get() != output) {
524 card->output.reset(output);
527 PixelFormat pixel_format;
528 if (card_type == CardType::FFMPEG_INPUT) {
529 pixel_format = capture->get_current_pixel_format();
530 } else if (card_type == CardType::CEF_INPUT) {
531 pixel_format = PixelFormat_8BitBGRA;
532 } else if (global_flags.ten_bit_input) {
533 pixel_format = PixelFormat_10BitYCbCr;
535 pixel_format = PixelFormat_8BitYCbCr;
538 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
539 if (card->frame_allocator == nullptr) {
540 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
542 card->capture->set_video_frame_allocator(card->frame_allocator.get());
543 if (card->surface == nullptr) {
544 card->surface = create_surface_with_same_format(mixer_surface);
546 while (!card->new_frames.empty()) card->new_frames.pop_front();
547 card->last_timecode = -1;
548 card->capture->set_pixel_format(pixel_format);
549 card->capture->configure_card();
551 // NOTE: start_bm_capture() happens in thread_func().
553 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
554 audio_mixer.reset_resampler(device);
555 audio_mixer.set_display_name(device, card->capture->get_description());
556 audio_mixer.trigger_state_changed_callback();
558 // Unregister old metrics, if any.
559 if (!card->labels.empty()) {
560 const vector<pair<string, string>> &labels = card->labels;
561 card->jitter_history.unregister_metrics(labels);
562 card->queue_length_policy.unregister_metrics(labels);
563 global_metrics.remove("input_received_frames", labels);
564 global_metrics.remove("input_dropped_frames_jitter", labels);
565 global_metrics.remove("input_dropped_frames_error", labels);
566 global_metrics.remove("input_dropped_frames_resets", labels);
567 global_metrics.remove("input_queue_length_frames", labels);
568 global_metrics.remove("input_queue_duped_frames", labels);
570 global_metrics.remove("input_has_signal_bool", labels);
571 global_metrics.remove("input_is_connected_bool", labels);
572 global_metrics.remove("input_interlaced_bool", labels);
573 global_metrics.remove("input_width_pixels", labels);
574 global_metrics.remove("input_height_pixels", labels);
575 global_metrics.remove("input_frame_rate_nom", labels);
576 global_metrics.remove("input_frame_rate_den", labels);
577 global_metrics.remove("input_sample_rate_hz", labels);
581 vector<pair<string, string>> labels;
583 snprintf(card_name, sizeof(card_name), "%d", card_index);
584 labels.emplace_back("card", card_name);
587 case CardType::LIVE_CARD:
588 labels.emplace_back("cardtype", "live");
590 case CardType::FAKE_CAPTURE:
591 labels.emplace_back("cardtype", "fake");
593 case CardType::FFMPEG_INPUT:
594 labels.emplace_back("cardtype", "ffmpeg");
596 case CardType::CEF_INPUT:
597 labels.emplace_back("cardtype", "cef");
602 card->jitter_history.register_metrics(labels);
603 card->queue_length_policy.register_metrics(labels);
604 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
605 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
606 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
607 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
608 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
609 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
611 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
612 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
613 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
614 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
615 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
616 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
617 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
618 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
619 card->labels = labels;
622 void Mixer::set_output_card_internal(int card_index)
624 // We don't really need to take card_mutex, since we're in the mixer
625 // thread and don't mess with any queues (which is the only thing that happens
626 // from other threads), but it's probably the safest in the long run.
627 unique_lock<mutex> lock(card_mutex);
628 if (output_card_index != -1) {
629 // Switch the old card from output to input.
630 CaptureCard *old_card = &cards[output_card_index];
631 old_card->output->end_output();
633 // Stop the fake card that we put into place.
634 // This needs to _not_ happen under the mutex, to avoid deadlock
635 // (delivering the last frame needs to take the mutex).
636 CaptureInterface *fake_capture = old_card->capture.get();
638 fake_capture->stop_dequeue_thread();
640 old_card->capture = move(old_card->parked_capture); // TODO: reset the metrics
641 old_card->is_fake_capture = false;
642 old_card->capture->start_bm_capture();
644 if (card_index != -1) {
645 CaptureCard *card = &cards[card_index];
646 CaptureInterface *capture = card->capture.get();
647 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
648 // several seconds to complete (blocking on DisableVideoInput);
649 // see if we can maybe do it asynchronously.
651 capture->stop_dequeue_thread();
653 card->parked_capture = move(card->capture);
654 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
655 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
656 card->queue_length_policy.reset(card_index);
657 card->capture->start_bm_capture();
658 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
659 card->output->start_output(desired_output_video_mode, pts_int);
661 output_card_index = card_index;
662 output_jitter_history.clear();
667 int unwrap_timecode(uint16_t current_wrapped, int last)
669 uint16_t last_wrapped = last & 0xffff;
670 if (current_wrapped > last_wrapped) {
671 return (last & ~0xffff) | current_wrapped;
673 return 0x10000 + ((last & ~0xffff) | current_wrapped);
679 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
680 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
681 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
683 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
684 CaptureCard *card = &cards[card_index];
686 ++card->metric_input_received_frames;
687 card->metric_input_has_signal_bool = video_format.has_signal;
688 card->metric_input_is_connected_bool = video_format.is_connected;
689 card->metric_input_interlaced_bool = video_format.interlaced;
690 card->metric_input_width_pixels = video_format.width;
691 card->metric_input_height_pixels = video_format.height;
692 card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
693 card->metric_input_frame_rate_den = video_format.frame_rate_den;
694 card->metric_input_sample_rate_hz = audio_format.sample_rate;
696 if (is_mode_scanning[card_index]) {
697 if (video_format.has_signal) {
698 // Found a stable signal, so stop scanning.
699 is_mode_scanning[card_index] = false;
701 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
702 steady_clock::time_point now = steady_clock::now();
703 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
704 if (sec_since_last_switch > switch_time_s) {
705 // It isn't this mode; try the next one.
706 mode_scanlist_index[card_index]++;
707 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
708 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
709 last_mode_scan_change[card_index] = now;
714 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
715 assert(frame_length > 0);
717 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;
718 if (num_samples > OUTPUT_FREQUENCY / 10) {
719 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",
720 card_index, int(audio_frame.len), int(audio_offset),
721 timecode, int(video_frame.len), int(video_offset), video_format.id);
722 if (video_frame.owner) {
723 video_frame.owner->release_frame(video_frame);
725 if (audio_frame.owner) {
726 audio_frame.owner->release_frame(audio_frame);
731 int dropped_frames = 0;
732 if (card->last_timecode != -1) {
733 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
736 // Number of samples per frame if we need to insert silence.
737 // (Could be nonintegral, but resampling will save us then.)
738 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
740 if (dropped_frames > MAX_FPS * 2) {
741 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
742 card_index, card->last_timecode, timecode);
743 audio_mixer.reset_resampler(device);
745 ++card->metric_input_resets;
746 } else if (dropped_frames > 0) {
747 // Insert silence as needed.
748 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
749 card_index, dropped_frames, timecode);
750 card->metric_input_dropped_frames_error += dropped_frames;
754 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
758 if (num_samples > 0) {
759 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
762 // Done with the audio, so release it.
763 if (audio_frame.owner) {
764 audio_frame.owner->release_frame(audio_frame);
767 card->last_timecode = timecode;
769 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
771 size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
772 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
773 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
774 // The calculation above is wrong for planar Y'CbCr, so just override it.
775 assert(card->type == CardType::FFMPEG_INPUT);
776 assert(video_offset == 0);
777 expected_length = video_frame.len;
779 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
780 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
781 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
782 cbcr_offset = video_format.width * video_format.height;
785 // All the other Y'CbCr formats are 4:2:2.
786 cbcr_width = video_format.width / 2;
787 cbcr_height = video_format.height;
788 cbcr_offset = video_offset / 2;
789 y_offset = video_frame.size / 2 + video_offset / 2;
791 if (video_frame.len - video_offset == 0 ||
792 video_frame.len - video_offset != expected_length) {
793 if (video_frame.len != 0) {
794 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
795 card_index, video_frame.len - video_offset, expected_length);
797 if (video_frame.owner) {
798 video_frame.owner->release_frame(video_frame);
801 // Still send on the information that we _had_ a frame, even though it's corrupted,
802 // so that pts can go up accordingly.
804 unique_lock<mutex> lock(card_mutex);
805 CaptureCard::NewFrame new_frame;
806 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
807 new_frame.length = frame_length;
808 new_frame.interlaced = false;
809 new_frame.dropped_frames = dropped_frames;
810 new_frame.received_timestamp = video_frame.received_timestamp;
811 card->new_frames.push_back(move(new_frame));
812 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
814 card->new_frames_changed.notify_all();
818 unsigned num_fields = video_format.interlaced ? 2 : 1;
819 steady_clock::time_point frame_upload_start;
820 bool interlaced_stride = false;
821 if (video_format.interlaced) {
822 // Send the two fields along as separate frames; the other side will need to add
823 // a deinterlacer to actually get this right.
824 assert(video_format.height % 2 == 0);
825 video_format.height /= 2;
827 assert(frame_length % 2 == 0);
830 if (video_format.second_field_start == 1) {
831 interlaced_stride = true;
833 frame_upload_start = steady_clock::now();
835 userdata->last_interlaced = video_format.interlaced;
836 userdata->last_has_signal = video_format.has_signal;
837 userdata->last_is_connected = video_format.is_connected;
838 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
839 userdata->last_frame_rate_den = video_format.frame_rate_den;
840 RefCountedFrame frame(video_frame);
842 // Upload the textures.
843 for (unsigned field = 0; field < num_fields; ++field) {
844 // Put the actual texture upload in a lambda that is executed in the main thread.
845 // It is entirely possible to do this in the same thread (and it might even be
846 // faster, depending on the GPU and driver), but it appears to be trickling
847 // driver bugs very easily.
849 // Note that this means we must hold on to the actual frame data in <userdata>
850 // until the upload command is run, but we hold on to <frame> much longer than that
851 // (in fact, all the way until we no longer use the texture in rendering).
852 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
853 unsigned field_start_line;
855 field_start_line = video_format.second_field_start;
857 field_start_line = video_format.extra_lines_top;
860 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
861 size_t v210_width = video_format.stride / sizeof(uint32_t);
862 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
864 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
867 switch (userdata->pixel_format) {
868 case PixelFormat_10BitYCbCr: {
869 size_t field_start = video_offset + video_format.stride * field_start_line;
870 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);
871 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
874 case PixelFormat_8BitYCbCr: {
875 size_t field_y_start = y_offset + video_format.width * field_start_line;
876 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
878 // Make up our own strides, since we are interleaving.
879 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);
880 upload_texture(userdata->tex_cbcr[field], cbcr_width, cbcr_height, cbcr_width * sizeof(uint16_t), interlaced_stride, GL_RG, GL_UNSIGNED_BYTE, field_cbcr_start);
883 case PixelFormat_8BitYCbCrPlanar: {
884 assert(field_start_line == 0); // We don't really support interlaced here.
885 size_t field_y_start = y_offset;
886 size_t field_cb_start = cbcr_offset;
887 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
889 // Make up our own strides, since we are interleaving.
890 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);
891 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
892 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
895 case PixelFormat_8BitBGRA: {
896 size_t field_start = video_offset + video_format.stride * field_start_line;
897 upload_texture(userdata->tex_rgba[field], video_format.width, video_format.height, video_format.stride, interlaced_stride, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, field_start);
898 // These could be asked to deliver mipmaps at any time.
899 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
901 glGenerateMipmap(GL_TEXTURE_2D);
903 glBindTexture(GL_TEXTURE_2D, 0);
911 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
916 // Don't upload the second field as fast as we can; wait until
917 // the field time has approximately passed. (Otherwise, we could
918 // get timing jitter against the other sources, and possibly also
919 // against the video display, although the latter is not as critical.)
920 // This requires our system clock to be reasonably close to the
921 // video clock, but that's not an unreasonable assumption.
922 steady_clock::time_point second_field_start = frame_upload_start +
923 nanoseconds(frame_length * 1000000000 / TIMEBASE);
924 this_thread::sleep_until(second_field_start);
928 unique_lock<mutex> lock(card_mutex);
929 CaptureCard::NewFrame new_frame;
930 new_frame.frame = frame;
931 new_frame.length = frame_length;
932 new_frame.field = field;
933 new_frame.interlaced = video_format.interlaced;
934 new_frame.upload_func = upload_func;
935 new_frame.dropped_frames = dropped_frames;
936 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
937 card->new_frames.push_back(move(new_frame));
938 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
940 card->new_frames_changed.notify_all();
944 void Mixer::bm_hotplug_add(libusb_device *dev)
946 lock_guard<mutex> lock(hotplug_mutex);
947 hotplugged_cards.push_back(dev);
950 void Mixer::bm_hotplug_remove(unsigned card_index)
952 cards[card_index].new_frames_changed.notify_all();
955 void Mixer::thread_func()
957 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
959 eglBindAPI(EGL_OPENGL_API);
960 QOpenGLContext *context = create_context(mixer_surface);
961 if (!make_current(context, mixer_surface)) {
966 // Start the actual capture. (We don't want to do it before we're actually ready
967 // to process output frames.)
968 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
969 if (int(card_index) != output_card_index) {
970 cards[card_index].capture->start_bm_capture();
974 BasicStats basic_stats(/*verbose=*/true);
975 int stats_dropped_frames = 0;
977 while (!should_quit) {
978 if (desired_output_card_index != output_card_index) {
979 set_output_card_internal(desired_output_card_index);
981 if (output_card_index != -1 &&
982 desired_output_video_mode != output_video_mode) {
983 DeckLinkOutput *output = cards[output_card_index].output.get();
984 output->end_output();
985 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
986 output->start_output(desired_output_video_mode, pts_int);
989 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
990 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
992 bool master_card_is_output;
993 unsigned master_card_index;
994 if (output_card_index != -1) {
995 master_card_is_output = true;
996 master_card_index = output_card_index;
998 master_card_is_output = false;
999 master_card_index = theme->map_signal(master_clock_channel);
1000 assert(master_card_index < num_cards);
1003 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
1004 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);
1005 stats_dropped_frames += output_frame_info.dropped_frames;
1007 handle_hotplugged_cards();
1009 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1010 if (card_index == master_card_index || !has_new_frame[card_index]) {
1013 if (new_frames[card_index].frame->len == 0) {
1014 ++new_frames[card_index].dropped_frames;
1016 if (new_frames[card_index].dropped_frames > 0) {
1017 printf("Card %u dropped %d frames before this\n",
1018 card_index, int(new_frames[card_index].dropped_frames));
1022 // If the first card is reporting a corrupted or otherwise dropped frame,
1023 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1024 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1025 ++stats_dropped_frames;
1026 pts_int += new_frames[master_card_index].length;
1030 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1031 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1034 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1035 assert(new_frame->frame != nullptr);
1036 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1039 // The new texture might need uploading before use.
1040 if (new_frame->upload_func) {
1041 new_frame->upload_func();
1042 new_frame->upload_func = nullptr;
1046 int64_t frame_duration = output_frame_info.frame_duration;
1047 render_one_frame(frame_duration);
1049 pts_int += frame_duration;
1051 basic_stats.update(frame_num, stats_dropped_frames);
1052 // if (frame_num % 100 == 0) chain->print_phase_timing();
1054 if (should_cut.exchange(false)) { // Test and clear.
1055 video_encoder->do_cut(frame_num);
1059 // Reset every 100 frames, so that local variations in frame times
1060 // (especially for the first few frames, when the shaders are
1061 // compiled etc.) don't make it hard to measure for the entire
1062 // remaining duration of the program.
1063 if (frame == 10000) {
1071 resource_pool->clean_context();
1074 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1076 if (output_card_index != -1) {
1077 // The output card (ie., cards[output_card_index].output) is the master clock,
1078 // so no input card (ie., cards[card_index].capture) is.
1081 return (card_index == master_card_index);
1084 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1086 // Count the number of frames in the queue, including any frames
1087 // we dropped. It's hard to know exactly how we should deal with
1088 // dropped (corrupted) input frames; they don't help our goal of
1089 // avoiding starvation, but they still add to the problem of latency.
1090 // Since dropped frames is going to mean a bump in the signal anyway,
1091 // we err on the side of having more stable latency instead.
1092 unsigned queue_length = 0;
1093 for (const CaptureCard::NewFrame &frame : card->new_frames) {
1094 queue_length += frame.dropped_frames + 1;
1097 // If needed, drop frames until the queue is below the safe limit.
1098 // We prefer to drop from the head, because all else being equal,
1099 // we'd like more recent frames (less latency).
1100 unsigned dropped_frames = 0;
1101 while (queue_length > safe_queue_length) {
1102 assert(!card->new_frames.empty());
1103 assert(queue_length > card->new_frames.front().dropped_frames);
1104 queue_length -= card->new_frames.front().dropped_frames;
1106 if (queue_length <= safe_queue_length) {
1107 // No need to drop anything.
1111 card->new_frames.pop_front();
1112 card->new_frames_changed.notify_all();
1117 card->metric_input_dropped_frames_jitter += dropped_frames;
1118 card->metric_input_queue_length_frames = queue_length;
1121 if (dropped_frames > 0) {
1122 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1123 card_index, dropped_frames);
1128 pair<string, string> Mixer::get_channels_json()
1131 for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
1132 Channel *channel = ret.add_channel();
1133 channel->set_index(channel_idx);
1134 channel->set_name(theme->get_channel_name(channel_idx));
1135 channel->set_color(theme->get_channel_color(channel_idx));
1138 google::protobuf::util::MessageToJsonString(ret, &contents); // Ignore any errors.
1139 return make_pair(contents, "text/json");
1142 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1144 return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1147 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])
1149 OutputFrameInfo output_frame_info;
1151 unique_lock<mutex> lock(card_mutex, defer_lock);
1152 if (master_card_is_output) {
1153 // Clocked to the output, so wait for it to be ready for the next frame.
1154 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);
1157 // Wait for the master card to have a new frame.
1158 // TODO: Add a timeout.
1159 output_frame_info.is_preroll = false;
1161 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(); });
1164 if (master_card_is_output) {
1165 handle_hotplugged_cards();
1166 } else if (cards[master_card_index].new_frames.empty()) {
1167 // We were woken up, but not due to a new frame. Deal with it
1168 // and then restart.
1169 assert(cards[master_card_index].capture->get_disconnected());
1170 handle_hotplugged_cards();
1175 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1176 CaptureCard *card = &cards[card_index];
1177 if (card->new_frames.empty()) { // Starvation.
1178 ++card->metric_input_duped_frames;
1180 new_frames[card_index] = move(card->new_frames.front());
1181 has_new_frame[card_index] = true;
1182 card->new_frames.pop_front();
1183 card->new_frames_changed.notify_all();
1187 if (!master_card_is_output) {
1188 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1189 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1190 output_frame_info.frame_duration = new_frames[master_card_index].length;
1193 if (!output_frame_info.is_preroll) {
1194 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1197 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1198 CaptureCard *card = &cards[card_index];
1199 if (has_new_frame[card_index] &&
1200 !input_card_is_master_clock(card_index, master_card_index) &&
1201 !output_frame_info.is_preroll) {
1202 card->queue_length_policy.update_policy(
1203 output_frame_info.frame_timestamp,
1204 card->jitter_history.get_expected_next_frame(),
1205 new_frames[master_card_index].length,
1206 output_frame_info.frame_duration,
1207 card->jitter_history.estimate_max_jitter(),
1208 output_jitter_history.estimate_max_jitter());
1209 trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1210 card->queue_length_policy.get_safe_queue_length()));
1214 // This might get off by a fractional sample when changing master card
1215 // between ones with different frame rates, but that's fine.
1216 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1217 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1218 fractional_samples = num_samples_times_timebase % TIMEBASE;
1219 assert(output_frame_info.num_samples >= 0);
1221 return output_frame_info;
1224 void Mixer::handle_hotplugged_cards()
1226 // Check for cards that have been disconnected since last frame.
1227 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1228 CaptureCard *card = &cards[card_index];
1229 if (card->capture->get_disconnected()) {
1230 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1231 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1232 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1233 card->queue_length_policy.reset(card_index);
1234 card->capture->start_bm_capture();
1238 // Check for cards that have been connected since last frame.
1239 vector<libusb_device *> hotplugged_cards_copy;
1241 lock_guard<mutex> lock(hotplug_mutex);
1242 swap(hotplugged_cards, hotplugged_cards_copy);
1244 for (libusb_device *new_dev : hotplugged_cards_copy) {
1245 // Look for a fake capture card where we can stick this in.
1246 int free_card_index = -1;
1247 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1248 if (cards[card_index].is_fake_capture) {
1249 free_card_index = card_index;
1254 if (free_card_index == -1) {
1255 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1256 libusb_unref_device(new_dev);
1258 // BMUSBCapture takes ownership.
1259 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1260 CaptureCard *card = &cards[free_card_index];
1261 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1262 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1263 card->queue_length_policy.reset(free_card_index);
1264 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1265 capture->start_bm_capture();
1271 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)
1273 // Resample the audio as needed, including from previously dropped frames.
1274 assert(num_cards > 0);
1275 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1276 const bool dropped_frame = (frame_num != dropped_frames);
1278 // Signal to the audio thread to process this frame.
1279 // Note that if the frame is a dropped frame, we signal that
1280 // we don't want to use this frame as base for adjusting
1281 // the resampler rate. The reason for this is that the timing
1282 // of these frames is often way too late; they typically don't
1283 // “arrive” before we synthesize them. Thus, we could end up
1284 // in a situation where we have inserted e.g. five audio frames
1285 // into the queue before we then start pulling five of them
1286 // back out. This makes ResamplingQueue overestimate the delay,
1287 // causing undue resampler changes. (We _do_ use the last,
1288 // non-dropped frame; perhaps we should just discard that as well,
1289 // since dropped frames are expected to be rare, and it might be
1290 // better to just wait until we have a slightly more normal situation).
1291 unique_lock<mutex> lock(audio_mutex);
1292 bool adjust_rate = !dropped_frame && !is_preroll;
1293 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1294 audio_task_queue_changed.notify_one();
1296 if (dropped_frame) {
1297 // For dropped frames, increase the pts. Note that if the format changed
1298 // in the meantime, we have no way of detecting that; we just have to
1299 // assume the frame length is always the same.
1300 pts_int += length_per_frame;
1305 void Mixer::render_one_frame(int64_t duration)
1307 // Determine the time code for this frame before we start rendering.
1308 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1309 if (display_timecode_on_stdout) {
1310 printf("Timecode: '%s'\n", timecode_text.c_str());
1313 // Update Y'CbCr settings for all cards.
1315 unique_lock<mutex> lock(card_mutex);
1316 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1317 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1318 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1319 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1320 input_state.full_range[card_index] = interpretation->full_range;
1324 // Get the main chain from the theme, and set its state immediately.
1325 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1326 EffectChain *chain = theme_main_chain.chain;
1327 theme_main_chain.setup_chain();
1328 //theme_main_chain.chain->enable_phase_timing(true);
1330 // The theme can't (or at least shouldn't!) call connect_signal() on
1331 // each FFmpeg or CEF input, so we'll do it here.
1332 for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_video_signal_connections()) {
1333 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1335 for (const pair<LiveInputWrapper *, CEFCapture *> &conn : theme->get_html_signal_connections()) {
1336 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1339 // If HDMI/SDI output is active and the user has requested auto mode,
1340 // its mode overrides the existing Y'CbCr setting for the chain.
1341 YCbCrLumaCoefficients ycbcr_output_coefficients;
1342 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1343 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1345 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1348 // TODO: Reduce the duplication against theme.cpp.
1349 YCbCrFormat output_ycbcr_format;
1350 output_ycbcr_format.chroma_subsampling_x = 1;
1351 output_ycbcr_format.chroma_subsampling_y = 1;
1352 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1353 output_ycbcr_format.full_range = false;
1354 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1355 chain->change_ycbcr_output_format(output_ycbcr_format);
1357 // Render main chain. If we're using zerocopy Quick Sync encoding
1358 // (the default case), we take an extra copy of the created outputs,
1359 // so that we can display it back to the screen later (it's less memory
1360 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1361 // Ideally, we'd like to avoid taking copies and just use the main textures
1362 // for display as well, but they're just views into VA-API memory and must be
1363 // unmapped during encoding, so we can't use them for display, unfortunately.
1364 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1365 GLuint y_copy_tex, cbcr_copy_tex = 0;
1366 GLuint y_display_tex, cbcr_display_tex;
1367 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1368 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1369 const bool is_zerocopy = video_encoder->is_zerocopy();
1371 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1372 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1373 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1375 y_display_tex = y_copy_tex;
1376 cbcr_display_tex = cbcr_copy_tex;
1378 // y_tex and cbcr_tex will be given by VideoEncoder.
1380 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1381 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1382 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1384 y_display_tex = y_tex;
1385 cbcr_display_tex = cbcr_tex;
1388 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1389 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1394 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1396 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1399 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1401 if (display_timecode_in_stream) {
1402 // Render the timecode on top.
1403 timecode_renderer->render_timecode(fbo, timecode_text);
1406 resource_pool->release_fbo(fbo);
1409 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1411 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1413 if (output_card_index != -1) {
1414 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1416 resource_pool->release_2d_texture(cbcr_full_tex);
1418 // Set the right state for the Y' and CbCr textures we use for display.
1419 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1420 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1421 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1422 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1423 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1425 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1426 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1427 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1428 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1430 RefCountedGLsync fence = video_encoder->end_frame();
1432 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1433 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1434 DisplayFrame live_frame;
1435 live_frame.chain = display_chain.get();
1436 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1437 display_input->set_texture_num(0, y_display_tex);
1438 display_input->set_texture_num(1, cbcr_display_tex);
1440 live_frame.ready_fence = fence;
1441 live_frame.input_frames = {};
1442 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1443 output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1445 // Set up preview and any additional channels.
1446 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1447 DisplayFrame display_frame;
1448 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1449 display_frame.chain = move(chain.chain);
1450 display_frame.setup_chain = move(chain.setup_chain);
1451 display_frame.ready_fence = fence;
1452 display_frame.input_frames = move(chain.input_frames);
1453 display_frame.temp_textures = {};
1454 output_channel[i].output_frame(move(display_frame));
1458 void Mixer::audio_thread_func()
1460 pthread_setname_np(pthread_self(), "Mixer_Audio");
1462 while (!should_quit) {
1466 unique_lock<mutex> lock(audio_mutex);
1467 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1471 task = audio_task_queue.front();
1472 audio_task_queue.pop();
1475 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1476 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1477 vector<float> samples_out = audio_mixer.get_output(
1478 task.frame_timestamp,
1480 rate_adjustment_policy);
1482 // Send the samples to the sound card, then add them to the output.
1484 alsa->write(samples_out);
1486 if (output_card_index != -1) {
1487 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1488 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1490 video_encoder->add_audio(task.pts_int, move(samples_out));
1494 void Mixer::release_display_frame(DisplayFrame *frame)
1496 for (GLuint texnum : frame->temp_textures) {
1497 resource_pool->release_2d_texture(texnum);
1499 frame->temp_textures.clear();
1500 frame->ready_fence.reset();
1501 frame->input_frames.clear();
1506 mixer_thread = thread(&Mixer::thread_func, this);
1507 audio_thread = thread(&Mixer::audio_thread_func, this);
1513 audio_task_queue_changed.notify_one();
1514 mixer_thread.join();
1515 audio_thread.join();
1518 void Mixer::transition_clicked(int transition_num)
1520 theme->transition_clicked(transition_num, pts());
1523 void Mixer::channel_clicked(int preview_num)
1525 theme->channel_clicked(preview_num);
1528 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1530 unique_lock<mutex> lock(card_mutex);
1531 return ycbcr_interpretation[card_index];
1534 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1536 unique_lock<mutex> lock(card_mutex);
1537 ycbcr_interpretation[card_index] = interpretation;
1540 void Mixer::start_mode_scanning(unsigned card_index)
1542 assert(card_index < num_cards);
1543 if (is_mode_scanning[card_index]) {
1546 is_mode_scanning[card_index] = true;
1547 mode_scanlist[card_index].clear();
1548 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1549 mode_scanlist[card_index].push_back(mode.first);
1551 assert(!mode_scanlist[card_index].empty());
1552 mode_scanlist_index[card_index] = 0;
1553 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1554 last_mode_scan_change[card_index] = steady_clock::now();
1557 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1559 assert(desired_output_card_index != -1);
1560 unique_lock<mutex> lock(card_mutex);
1561 return cards[desired_output_card_index].output->get_available_video_modes();
1564 Mixer::OutputChannel::~OutputChannel()
1566 if (has_current_frame) {
1567 parent->release_display_frame(¤t_frame);
1569 if (has_ready_frame) {
1570 parent->release_display_frame(&ready_frame);
1574 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1576 // Store this frame for display. Remove the ready frame if any
1577 // (it was seemingly never used).
1579 unique_lock<mutex> lock(frame_mutex);
1580 if (has_ready_frame) {
1581 parent->release_display_frame(&ready_frame);
1583 ready_frame = move(frame);
1584 has_ready_frame = true;
1586 // Call the callbacks under the mutex (they should be short),
1587 // so that we don't race against a callback removal.
1588 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1589 key_and_callback.second();
1593 // Reduce the number of callbacks by filtering duplicates. The reason
1594 // why we bother doing this is that Qt seemingly can get into a state
1595 // where its builds up an essentially unbounded queue of signals,
1596 // consuming more and more memory, and there's no good way of collapsing
1597 // user-defined signals or limiting the length of the queue.
1598 if (transition_names_updated_callback) {
1599 vector<string> transition_names = global_mixer->get_transition_names();
1600 bool changed = false;
1601 if (transition_names.size() != last_transition_names.size()) {
1604 for (unsigned i = 0; i < transition_names.size(); ++i) {
1605 if (transition_names[i] != last_transition_names[i]) {
1612 transition_names_updated_callback(transition_names);
1613 last_transition_names = transition_names;
1616 if (name_updated_callback) {
1617 string name = global_mixer->get_channel_name(channel);
1618 if (name != last_name) {
1619 name_updated_callback(name);
1623 if (color_updated_callback) {
1624 string color = global_mixer->get_channel_color(channel);
1625 if (color != last_color) {
1626 color_updated_callback(color);
1632 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1634 unique_lock<mutex> lock(frame_mutex);
1635 if (!has_current_frame && !has_ready_frame) {
1639 if (has_current_frame && has_ready_frame) {
1640 // We have a new ready frame. Toss the current one.
1641 parent->release_display_frame(¤t_frame);
1642 has_current_frame = false;
1644 if (has_ready_frame) {
1645 assert(!has_current_frame);
1646 current_frame = move(ready_frame);
1647 ready_frame.ready_fence.reset(); // Drop the refcount.
1648 ready_frame.input_frames.clear(); // Drop the refcounts.
1649 has_current_frame = true;
1650 has_ready_frame = false;
1653 *frame = current_frame;
1657 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1659 unique_lock<mutex> lock(frame_mutex);
1660 new_frame_ready_callbacks[key] = callback;
1663 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1665 unique_lock<mutex> lock(frame_mutex);
1666 new_frame_ready_callbacks.erase(key);
1669 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1671 transition_names_updated_callback = callback;
1674 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1676 name_updated_callback = callback;
1679 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1681 color_updated_callback = callback;
1684 mutex RefCountedGLsync::fence_lock;