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"
37 #include "cef_capture.h"
39 #include "chroma_subsampler.h"
41 #include "decklink_capture.h"
42 #include "decklink_output.h"
44 #include "disk_space_estimator.h"
45 #include "ffmpeg_capture.h"
47 #include "input_mapping.h"
49 #include "pbo_frame_allocator.h"
50 #include "ref_counted_gl_sync.h"
51 #include "resampling_queue.h"
53 #include "timecode_renderer.h"
54 #include "v210_converter.h"
55 #include "video_encoder.h"
58 #include <google/protobuf/util/json_util.h>
64 using namespace movit;
66 using namespace std::chrono;
67 using namespace std::placeholders;
68 using namespace bmusb;
70 Mixer *global_mixer = nullptr;
74 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
77 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
78 input_state->buffered_frames[card_index][frame_num] =
79 input_state->buffered_frames[card_index][frame_num - 1];
81 input_state->buffered_frames[card_index][0] = { frame, field_num };
83 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
84 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
89 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
92 switch (userdata->pixel_format) {
93 case PixelFormat_10BitYCbCr:
94 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
96 case PixelFormat_8BitYCbCr:
97 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
99 case PixelFormat_8BitBGRA:
100 first = userdata->tex_rgba[field] == 0;
102 case PixelFormat_8BitYCbCrPlanar:
103 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
110 width != userdata->last_width[field] ||
111 height != userdata->last_height[field] ||
112 cbcr_width != userdata->last_cbcr_width[field] ||
113 cbcr_height != userdata->last_cbcr_height[field]) {
114 // We changed resolution since last use of this texture, so we need to create
115 // a new object. Note that this each card has its own PBOFrameAllocator,
116 // we don't need to worry about these flip-flopping between resolutions.
117 switch (userdata->pixel_format) {
118 case PixelFormat_10BitYCbCr:
119 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
121 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
124 case PixelFormat_8BitYCbCr: {
125 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
127 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
129 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
131 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
135 case PixelFormat_8BitYCbCrPlanar: {
136 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
138 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
140 glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
142 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
144 glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
146 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
150 case PixelFormat_8BitBGRA:
151 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
153 if (global_flags.can_disable_srgb_decoder) { // See the comments in tweaked_inputs.h.
154 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
156 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
161 userdata->last_width[field] = width;
162 userdata->last_height[field] = height;
163 userdata->last_cbcr_width[field] = cbcr_width;
164 userdata->last_cbcr_height[field] = cbcr_height;
166 if (global_flags.ten_bit_input &&
167 (first || v210_width != userdata->last_v210_width[field])) {
168 // Same as above; we need to recreate the texture.
169 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
171 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
173 userdata->last_v210_width[field] = v210_width;
177 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
179 if (interlaced_stride) {
182 if (global_flags.flush_pbos) {
183 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
187 glBindTexture(GL_TEXTURE_2D, tex);
189 if (interlaced_stride) {
190 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
193 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
197 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
199 glBindTexture(GL_TEXTURE_2D, 0);
201 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
207 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
209 global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
210 global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
213 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
215 global_metrics.remove("input_underestimated_jitter_frames", labels);
216 global_metrics.remove("input_estimated_max_jitter_seconds", labels);
219 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
221 if (expected_timestamp > steady_clock::time_point::min()) {
222 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
223 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
224 history.push_back(orders.insert(jitter_seconds));
225 if (jitter_seconds > estimate_max_jitter()) {
226 ++metric_input_underestimated_jitter_frames;
229 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
231 if (history.size() > history_length) {
232 orders.erase(history.front());
235 assert(history.size() <= history_length);
237 expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
240 double JitterHistory::estimate_max_jitter() const
242 if (orders.empty()) {
245 size_t elem_idx = lrint((orders.size() - 1) * percentile);
246 if (percentile <= 0.5) {
247 return *next(orders.begin(), elem_idx) * multiplier;
249 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
253 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
255 global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
258 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
260 global_metrics.remove("input_queue_safe_length_frames", labels);
263 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
264 steady_clock::time_point expected_next_frame,
265 int64_t input_frame_duration,
266 int64_t master_frame_duration,
267 double max_input_card_jitter_seconds,
268 double max_master_card_jitter_seconds)
270 double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
271 double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
273 // Figure out when we can expect the next frame for this card, assuming
274 // worst-case jitter (ie., the frame is maximally late).
275 double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
277 // How many times are the master card expected to tick in that time?
278 // We assume the master clock has worst-case jitter but not any rate
279 // discrepancy, ie., it ticks as early as possible every time, but not
281 double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
283 // As a special case, if the master card ticks faster than the input card,
284 // we expect the queue to drain by itself even without dropping. But if
285 // the difference is small (e.g. 60 Hz master and 59.94 input), it would
286 // go slowly enough that the effect wouldn't really be appreciable.
287 // We account for this by looking at the situation five frames ahead,
288 // assuming everything else is the same.
289 double frames_allowed;
290 if (master_frame_duration < input_frame_duration) {
291 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
293 frames_allowed = frames_needed;
296 safe_queue_length = max<int>(floor(frames_allowed), 0);
297 metric_input_queue_safe_length_frames = safe_queue_length;
300 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
302 num_cards(num_cards),
303 mixer_surface(create_surface(format)),
304 h264_encoder_surface(create_surface(format)),
305 decklink_output_surface(create_surface(format)),
306 audio_mixer(num_cards)
308 memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
309 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
312 // This nearly always should be true.
313 global_flags.can_disable_srgb_decoder =
314 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
315 epoxy_has_gl_extension("GL_ARB_sampler_objects");
317 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
318 // will be halved when sampling them, and we need to compensate here.
319 movit_texel_subpixel_precision /= 2.0;
321 resource_pool.reset(new ResourcePool);
322 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
323 output_channel[i].parent = this;
324 output_channel[i].channel = i;
327 ImageFormat inout_format;
328 inout_format.color_space = COLORSPACE_sRGB;
329 inout_format.gamma_curve = GAMMA_sRGB;
331 // Matches the 4:2:0 format created by the main chain.
332 YCbCrFormat ycbcr_format;
333 ycbcr_format.chroma_subsampling_x = 2;
334 ycbcr_format.chroma_subsampling_y = 2;
335 if (global_flags.ycbcr_rec709_coefficients) {
336 ycbcr_format.luma_coefficients = YCBCR_REC_709;
338 ycbcr_format.luma_coefficients = YCBCR_REC_601;
340 ycbcr_format.full_range = false;
341 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
342 ycbcr_format.cb_x_position = 0.0f;
343 ycbcr_format.cr_x_position = 0.0f;
344 ycbcr_format.cb_y_position = 0.5f;
345 ycbcr_format.cr_y_position = 0.5f;
347 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
348 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
350 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
351 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
352 display_chain->add_input(display_input);
353 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
354 display_chain->set_dither_bits(0); // Don't bother.
355 display_chain->finalize();
357 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));
359 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
360 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
362 httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
363 for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
365 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx);
366 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx)), HTTPD::ALLOW_ALL_ORIGINS);
369 // Start listening for clients only once VideoEncoder has written its header, if any.
370 httpd.start(global_flags.http_port);
372 // First try initializing the then PCI devices, then USB, then
373 // fill up with fake cards until we have the desired number of cards.
374 unsigned num_pci_devices = 0;
375 unsigned card_index = 0;
378 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
379 if (decklink_iterator != nullptr) {
380 for ( ; card_index < num_cards; ++card_index) {
382 if (decklink_iterator->Next(&decklink) != S_OK) {
386 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
387 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
388 if (!output->set_device(decklink)) {
392 configure_card(card_index, capture, CardType::LIVE_CARD, output);
395 decklink_iterator->Release();
396 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
398 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
402 unsigned num_usb_devices = BMUSBCapture::num_cards();
403 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
404 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
405 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
406 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
408 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
410 unsigned num_fake_cards = 0;
411 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
412 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
413 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
416 if (num_fake_cards > 0) {
417 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
420 // Initialize all video inputs the theme asked for. Note that these are
421 // all put _after_ the regular cards, which stop at <num_cards> - 1.
422 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
423 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
424 if (card_index >= MAX_VIDEO_CARDS) {
425 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
428 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
429 video_inputs[video_card_index]->set_card_index(card_index);
431 num_video_inputs = video_inputs.size();
434 // Same, for HTML inputs.
435 std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
436 for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
437 if (card_index >= MAX_VIDEO_CARDS) {
438 fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
441 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr);
442 html_inputs[html_card_index]->set_card_index(card_index);
444 num_html_inputs = html_inputs.size();
447 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
448 BMUSBCapture::start_bm_thread();
450 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
451 cards[card_index].queue_length_policy.reset(card_index);
454 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
456 if (global_flags.ten_bit_input) {
457 if (!v210Converter::has_hardware_support()) {
458 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
459 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
462 v210_converter.reset(new v210Converter());
464 // These are all the widths listed in the Blackmagic SDK documentation
465 // (section 2.7.3, “Display Modes”).
466 v210_converter->precompile_shader(720);
467 v210_converter->precompile_shader(1280);
468 v210_converter->precompile_shader(1920);
469 v210_converter->precompile_shader(2048);
470 v210_converter->precompile_shader(3840);
471 v210_converter->precompile_shader(4096);
473 if (global_flags.ten_bit_output) {
474 if (!v210Converter::has_hardware_support()) {
475 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
476 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
481 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
482 display_timecode_in_stream = global_flags.display_timecode_in_stream;
483 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
485 if (global_flags.enable_alsa_output) {
486 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
488 if (global_flags.output_card != -1) {
489 desired_output_card_index = global_flags.output_card;
490 set_output_card_internal(global_flags.output_card);
493 output_jitter_history.register_metrics({{ "card", "output" }});
498 BMUSBCapture::stop_bm_thread();
500 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
502 unique_lock<mutex> lock(card_mutex);
503 cards[card_index].should_quit = true; // Unblock thread.
504 cards[card_index].new_frames_changed.notify_all();
506 cards[card_index].capture->stop_dequeue_thread();
507 if (cards[card_index].output) {
508 cards[card_index].output->end_output();
509 cards[card_index].output.reset();
513 video_encoder.reset(nullptr);
516 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
518 printf("Configuring card %d...\n", card_index);
520 CaptureCard *card = &cards[card_index];
521 if (card->capture != nullptr) {
522 card->capture->stop_dequeue_thread();
524 card->capture.reset(capture);
525 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
526 card->is_cef_capture = (card_type == CardType::CEF_INPUT);
527 card->may_have_dropped_last_frame = false;
528 card->type = card_type;
529 if (card->output.get() != output) {
530 card->output.reset(output);
533 PixelFormat pixel_format;
534 if (card_type == CardType::FFMPEG_INPUT) {
535 pixel_format = capture->get_current_pixel_format();
536 } else if (card_type == CardType::CEF_INPUT) {
537 pixel_format = PixelFormat_8BitBGRA;
538 } else if (global_flags.ten_bit_input) {
539 pixel_format = PixelFormat_10BitYCbCr;
541 pixel_format = PixelFormat_8BitYCbCr;
544 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
545 if (card->frame_allocator == nullptr) {
546 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
548 card->capture->set_video_frame_allocator(card->frame_allocator.get());
549 if (card->surface == nullptr) {
550 card->surface = create_surface_with_same_format(mixer_surface);
552 while (!card->new_frames.empty()) card->new_frames.pop_front();
553 card->last_timecode = -1;
554 card->capture->set_pixel_format(pixel_format);
555 card->capture->configure_card();
557 // NOTE: start_bm_capture() happens in thread_func().
559 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
560 audio_mixer.reset_resampler(device);
561 audio_mixer.set_display_name(device, card->capture->get_description());
562 audio_mixer.trigger_state_changed_callback();
564 // Unregister old metrics, if any.
565 if (!card->labels.empty()) {
566 const vector<pair<string, string>> &labels = card->labels;
567 card->jitter_history.unregister_metrics(labels);
568 card->queue_length_policy.unregister_metrics(labels);
569 global_metrics.remove("input_received_frames", labels);
570 global_metrics.remove("input_dropped_frames_jitter", labels);
571 global_metrics.remove("input_dropped_frames_error", labels);
572 global_metrics.remove("input_dropped_frames_resets", labels);
573 global_metrics.remove("input_queue_length_frames", labels);
574 global_metrics.remove("input_queue_duped_frames", labels);
576 global_metrics.remove("input_has_signal_bool", labels);
577 global_metrics.remove("input_is_connected_bool", labels);
578 global_metrics.remove("input_interlaced_bool", labels);
579 global_metrics.remove("input_width_pixels", labels);
580 global_metrics.remove("input_height_pixels", labels);
581 global_metrics.remove("input_frame_rate_nom", labels);
582 global_metrics.remove("input_frame_rate_den", labels);
583 global_metrics.remove("input_sample_rate_hz", labels);
587 vector<pair<string, string>> labels;
589 snprintf(card_name, sizeof(card_name), "%d", card_index);
590 labels.emplace_back("card", card_name);
593 case CardType::LIVE_CARD:
594 labels.emplace_back("cardtype", "live");
596 case CardType::FAKE_CAPTURE:
597 labels.emplace_back("cardtype", "fake");
599 case CardType::FFMPEG_INPUT:
600 labels.emplace_back("cardtype", "ffmpeg");
602 case CardType::CEF_INPUT:
603 labels.emplace_back("cardtype", "cef");
608 card->jitter_history.register_metrics(labels);
609 card->queue_length_policy.register_metrics(labels);
610 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
611 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
612 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
613 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
614 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
615 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
617 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
618 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
619 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
620 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
621 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
622 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
623 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
624 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
625 card->labels = labels;
628 void Mixer::set_output_card_internal(int card_index)
630 // We don't really need to take card_mutex, since we're in the mixer
631 // thread and don't mess with any queues (which is the only thing that happens
632 // from other threads), but it's probably the safest in the long run.
633 unique_lock<mutex> lock(card_mutex);
634 if (output_card_index != -1) {
635 // Switch the old card from output to input.
636 CaptureCard *old_card = &cards[output_card_index];
637 old_card->output->end_output();
639 // Stop the fake card that we put into place.
640 // This needs to _not_ happen under the mutex, to avoid deadlock
641 // (delivering the last frame needs to take the mutex).
642 CaptureInterface *fake_capture = old_card->capture.get();
644 fake_capture->stop_dequeue_thread();
646 old_card->capture = move(old_card->parked_capture); // TODO: reset the metrics
647 old_card->is_fake_capture = false;
648 old_card->capture->start_bm_capture();
650 if (card_index != -1) {
651 CaptureCard *card = &cards[card_index];
652 CaptureInterface *capture = card->capture.get();
653 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
654 // several seconds to complete (blocking on DisableVideoInput);
655 // see if we can maybe do it asynchronously.
657 capture->stop_dequeue_thread();
659 card->parked_capture = move(card->capture);
660 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
661 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
662 card->queue_length_policy.reset(card_index);
663 card->capture->start_bm_capture();
664 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
665 card->output->start_output(desired_output_video_mode, pts_int);
667 output_card_index = card_index;
668 output_jitter_history.clear();
673 int unwrap_timecode(uint16_t current_wrapped, int last)
675 uint16_t last_wrapped = last & 0xffff;
676 if (current_wrapped > last_wrapped) {
677 return (last & ~0xffff) | current_wrapped;
679 return 0x10000 + ((last & ~0xffff) | current_wrapped);
685 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
686 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
687 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
689 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
690 CaptureCard *card = &cards[card_index];
692 ++card->metric_input_received_frames;
693 card->metric_input_has_signal_bool = video_format.has_signal;
694 card->metric_input_is_connected_bool = video_format.is_connected;
695 card->metric_input_interlaced_bool = video_format.interlaced;
696 card->metric_input_width_pixels = video_format.width;
697 card->metric_input_height_pixels = video_format.height;
698 card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
699 card->metric_input_frame_rate_den = video_format.frame_rate_den;
700 card->metric_input_sample_rate_hz = audio_format.sample_rate;
702 if (is_mode_scanning[card_index]) {
703 if (video_format.has_signal) {
704 // Found a stable signal, so stop scanning.
705 is_mode_scanning[card_index] = false;
707 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
708 steady_clock::time_point now = steady_clock::now();
709 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
710 if (sec_since_last_switch > switch_time_s) {
711 // It isn't this mode; try the next one.
712 mode_scanlist_index[card_index]++;
713 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
714 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
715 last_mode_scan_change[card_index] = now;
720 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
721 assert(frame_length > 0);
723 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;
724 if (num_samples > OUTPUT_FREQUENCY / 10) {
725 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",
726 card_index, int(audio_frame.len), int(audio_offset),
727 timecode, int(video_frame.len), int(video_offset), video_format.id);
728 if (video_frame.owner) {
729 video_frame.owner->release_frame(video_frame);
731 if (audio_frame.owner) {
732 audio_frame.owner->release_frame(audio_frame);
737 int dropped_frames = 0;
738 if (card->last_timecode != -1) {
739 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
742 // Number of samples per frame if we need to insert silence.
743 // (Could be nonintegral, but resampling will save us then.)
744 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
746 if (dropped_frames > MAX_FPS * 2) {
747 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
748 card_index, card->last_timecode, timecode);
749 audio_mixer.reset_resampler(device);
751 ++card->metric_input_resets;
752 } else if (dropped_frames > 0) {
753 // Insert silence as needed.
754 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
755 card_index, dropped_frames, timecode);
756 card->metric_input_dropped_frames_error += dropped_frames;
760 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
764 if (num_samples > 0) {
765 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
768 // Done with the audio, so release it.
769 if (audio_frame.owner) {
770 audio_frame.owner->release_frame(audio_frame);
773 card->last_timecode = timecode;
775 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
777 size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
778 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
779 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
780 // The calculation above is wrong for planar Y'CbCr, so just override it.
781 assert(card->type == CardType::FFMPEG_INPUT);
782 assert(video_offset == 0);
783 expected_length = video_frame.len;
785 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
786 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
787 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
788 cbcr_offset = video_format.width * video_format.height;
791 // All the other Y'CbCr formats are 4:2:2.
792 cbcr_width = video_format.width / 2;
793 cbcr_height = video_format.height;
794 cbcr_offset = video_offset / 2;
795 y_offset = video_frame.size / 2 + video_offset / 2;
797 if (video_frame.len - video_offset == 0 ||
798 video_frame.len - video_offset != expected_length) {
799 if (video_frame.len != 0) {
800 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
801 card_index, video_frame.len - video_offset, expected_length);
803 if (video_frame.owner) {
804 video_frame.owner->release_frame(video_frame);
807 // Still send on the information that we _had_ a frame, even though it's corrupted,
808 // so that pts can go up accordingly.
810 unique_lock<mutex> lock(card_mutex);
811 CaptureCard::NewFrame new_frame;
812 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
813 new_frame.length = frame_length;
814 new_frame.interlaced = false;
815 new_frame.dropped_frames = dropped_frames;
816 new_frame.received_timestamp = video_frame.received_timestamp;
817 card->new_frames.push_back(move(new_frame));
818 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
820 card->new_frames_changed.notify_all();
824 unsigned num_fields = video_format.interlaced ? 2 : 1;
825 steady_clock::time_point frame_upload_start;
826 bool interlaced_stride = false;
827 if (video_format.interlaced) {
828 // Send the two fields along as separate frames; the other side will need to add
829 // a deinterlacer to actually get this right.
830 assert(video_format.height % 2 == 0);
831 video_format.height /= 2;
833 assert(frame_length % 2 == 0);
836 if (video_format.second_field_start == 1) {
837 interlaced_stride = true;
839 frame_upload_start = steady_clock::now();
841 userdata->last_interlaced = video_format.interlaced;
842 userdata->last_has_signal = video_format.has_signal;
843 userdata->last_is_connected = video_format.is_connected;
844 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
845 userdata->last_frame_rate_den = video_format.frame_rate_den;
846 RefCountedFrame frame(video_frame);
848 // Upload the textures.
849 for (unsigned field = 0; field < num_fields; ++field) {
850 // Put the actual texture upload in a lambda that is executed in the main thread.
851 // It is entirely possible to do this in the same thread (and it might even be
852 // faster, depending on the GPU and driver), but it appears to be trickling
853 // driver bugs very easily.
855 // Note that this means we must hold on to the actual frame data in <userdata>
856 // until the upload command is run, but we hold on to <frame> much longer than that
857 // (in fact, all the way until we no longer use the texture in rendering).
858 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
859 unsigned field_start_line;
861 field_start_line = video_format.second_field_start;
863 field_start_line = video_format.extra_lines_top;
866 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
867 size_t v210_width = video_format.stride / sizeof(uint32_t);
868 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
870 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
873 switch (userdata->pixel_format) {
874 case PixelFormat_10BitYCbCr: {
875 size_t field_start = video_offset + video_format.stride * field_start_line;
876 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);
877 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
880 case PixelFormat_8BitYCbCr: {
881 size_t field_y_start = y_offset + video_format.width * field_start_line;
882 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
884 // Make up our own strides, since we are interleaving.
885 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);
886 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);
889 case PixelFormat_8BitYCbCrPlanar: {
890 assert(field_start_line == 0); // We don't really support interlaced here.
891 size_t field_y_start = y_offset;
892 size_t field_cb_start = cbcr_offset;
893 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
895 // Make up our own strides, since we are interleaving.
896 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);
897 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
898 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
901 case PixelFormat_8BitBGRA: {
902 size_t field_start = video_offset + video_format.stride * field_start_line;
903 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);
904 // These could be asked to deliver mipmaps at any time.
905 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
907 glGenerateMipmap(GL_TEXTURE_2D);
909 glBindTexture(GL_TEXTURE_2D, 0);
917 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
922 // Don't upload the second field as fast as we can; wait until
923 // the field time has approximately passed. (Otherwise, we could
924 // get timing jitter against the other sources, and possibly also
925 // against the video display, although the latter is not as critical.)
926 // This requires our system clock to be reasonably close to the
927 // video clock, but that's not an unreasonable assumption.
928 steady_clock::time_point second_field_start = frame_upload_start +
929 nanoseconds(frame_length * 1000000000 / TIMEBASE);
930 this_thread::sleep_until(second_field_start);
934 unique_lock<mutex> lock(card_mutex);
935 CaptureCard::NewFrame new_frame;
936 new_frame.frame = frame;
937 new_frame.length = frame_length;
938 new_frame.field = field;
939 new_frame.interlaced = video_format.interlaced;
940 new_frame.upload_func = upload_func;
941 new_frame.dropped_frames = dropped_frames;
942 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
943 card->new_frames.push_back(move(new_frame));
944 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
945 card->may_have_dropped_last_frame = false;
947 card->new_frames_changed.notify_all();
951 void Mixer::bm_hotplug_add(libusb_device *dev)
953 lock_guard<mutex> lock(hotplug_mutex);
954 hotplugged_cards.push_back(dev);
957 void Mixer::bm_hotplug_remove(unsigned card_index)
959 cards[card_index].new_frames_changed.notify_all();
962 void Mixer::thread_func()
964 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
966 eglBindAPI(EGL_OPENGL_API);
967 QOpenGLContext *context = create_context(mixer_surface);
968 if (!make_current(context, mixer_surface)) {
973 // Start the actual capture. (We don't want to do it before we're actually ready
974 // to process output frames.)
975 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
976 if (int(card_index) != output_card_index) {
977 cards[card_index].capture->start_bm_capture();
981 BasicStats basic_stats(/*verbose=*/true);
982 int stats_dropped_frames = 0;
984 while (!should_quit) {
985 if (desired_output_card_index != output_card_index) {
986 set_output_card_internal(desired_output_card_index);
988 if (output_card_index != -1 &&
989 desired_output_video_mode != output_video_mode) {
990 DeckLinkOutput *output = cards[output_card_index].output.get();
991 output->end_output();
992 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
993 output->start_output(desired_output_video_mode, pts_int);
996 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
997 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
999 bool master_card_is_output;
1000 unsigned master_card_index;
1001 if (output_card_index != -1) {
1002 master_card_is_output = true;
1003 master_card_index = output_card_index;
1005 master_card_is_output = false;
1006 master_card_index = theme->map_signal(master_clock_channel);
1007 assert(master_card_index < num_cards);
1010 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
1011 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);
1012 stats_dropped_frames += output_frame_info.dropped_frames;
1014 handle_hotplugged_cards();
1016 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1017 if (card_index == master_card_index || !has_new_frame[card_index]) {
1020 if (new_frames[card_index].frame->len == 0) {
1021 ++new_frames[card_index].dropped_frames;
1023 if (new_frames[card_index].dropped_frames > 0) {
1024 printf("Card %u dropped %d frames before this\n",
1025 card_index, int(new_frames[card_index].dropped_frames));
1029 // If the first card is reporting a corrupted or otherwise dropped frame,
1030 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1031 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1032 ++stats_dropped_frames;
1033 pts_int += new_frames[master_card_index].length;
1037 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1038 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1041 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1042 assert(new_frame->frame != nullptr);
1043 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1046 // The new texture might need uploading before use.
1047 if (new_frame->upload_func) {
1048 new_frame->upload_func();
1049 new_frame->upload_func = nullptr;
1053 int64_t frame_duration = output_frame_info.frame_duration;
1054 render_one_frame(frame_duration);
1056 pts_int += frame_duration;
1058 basic_stats.update(frame_num, stats_dropped_frames);
1059 // if (frame_num % 100 == 0) chain->print_phase_timing();
1061 if (should_cut.exchange(false)) { // Test and clear.
1062 video_encoder->do_cut(frame_num);
1066 // Reset every 100 frames, so that local variations in frame times
1067 // (especially for the first few frames, when the shaders are
1068 // compiled etc.) don't make it hard to measure for the entire
1069 // remaining duration of the program.
1070 if (frame == 10000) {
1078 resource_pool->clean_context();
1081 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1083 if (output_card_index != -1) {
1084 // The output card (ie., cards[output_card_index].output) is the master clock,
1085 // so no input card (ie., cards[card_index].capture) is.
1088 return (card_index == master_card_index);
1091 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1093 // Count the number of frames in the queue, including any frames
1094 // we dropped. It's hard to know exactly how we should deal with
1095 // dropped (corrupted) input frames; they don't help our goal of
1096 // avoiding starvation, but they still add to the problem of latency.
1097 // Since dropped frames is going to mean a bump in the signal anyway,
1098 // we err on the side of having more stable latency instead.
1099 unsigned queue_length = 0;
1100 for (const CaptureCard::NewFrame &frame : card->new_frames) {
1101 queue_length += frame.dropped_frames + 1;
1104 // If needed, drop frames until the queue is below the safe limit.
1105 // We prefer to drop from the head, because all else being equal,
1106 // we'd like more recent frames (less latency).
1107 unsigned dropped_frames = 0;
1108 while (queue_length > safe_queue_length) {
1109 assert(!card->new_frames.empty());
1110 assert(queue_length > card->new_frames.front().dropped_frames);
1111 queue_length -= card->new_frames.front().dropped_frames;
1113 if (queue_length <= safe_queue_length) {
1114 // No need to drop anything.
1118 card->new_frames.pop_front();
1119 card->new_frames_changed.notify_all();
1123 if (queue_length == 0 && card->is_cef_capture) {
1124 card->may_have_dropped_last_frame = true;
1128 card->metric_input_dropped_frames_jitter += dropped_frames;
1129 card->metric_input_queue_length_frames = queue_length;
1132 if (dropped_frames > 0) {
1133 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1134 card_index, dropped_frames);
1139 pair<string, string> Mixer::get_channels_json()
1142 for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
1143 Channel *channel = ret.add_channel();
1144 channel->set_index(channel_idx);
1145 channel->set_name(theme->get_channel_name(channel_idx));
1146 channel->set_color(theme->get_channel_color(channel_idx));
1149 google::protobuf::util::MessageToJsonString(ret, &contents); // Ignore any errors.
1150 return make_pair(contents, "text/json");
1153 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1155 return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1158 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])
1160 OutputFrameInfo output_frame_info;
1162 unique_lock<mutex> lock(card_mutex, defer_lock);
1163 if (master_card_is_output) {
1164 // Clocked to the output, so wait for it to be ready for the next frame.
1165 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);
1168 // Wait for the master card to have a new frame.
1169 // TODO: Add a timeout.
1170 output_frame_info.is_preroll = false;
1172 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(); });
1175 if (master_card_is_output) {
1176 handle_hotplugged_cards();
1177 } else if (cards[master_card_index].new_frames.empty()) {
1178 // We were woken up, but not due to a new frame. Deal with it
1179 // and then restart.
1180 assert(cards[master_card_index].capture->get_disconnected());
1181 handle_hotplugged_cards();
1186 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1187 CaptureCard *card = &cards[card_index];
1188 if (card->new_frames.empty()) { // Starvation.
1189 ++card->metric_input_duped_frames;
1190 if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1191 // Unlike other sources, CEF is not guaranteed to send us a steady
1192 // stream of frames, so we'll have to ask it to repaint the frame
1193 // we dropped. (may_have_dropped_last_frame is set whenever we
1194 // trim the queue completely away, and cleared when we actually
1195 // get a new frame.)
1196 ((CEFCapture *)card->capture.get())->request_new_frame();
1199 new_frames[card_index] = move(card->new_frames.front());
1200 has_new_frame[card_index] = true;
1201 card->new_frames.pop_front();
1202 card->new_frames_changed.notify_all();
1206 if (!master_card_is_output) {
1207 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1208 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1209 output_frame_info.frame_duration = new_frames[master_card_index].length;
1212 if (!output_frame_info.is_preroll) {
1213 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1216 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1217 CaptureCard *card = &cards[card_index];
1218 if (has_new_frame[card_index] &&
1219 !input_card_is_master_clock(card_index, master_card_index) &&
1220 !output_frame_info.is_preroll) {
1221 card->queue_length_policy.update_policy(
1222 output_frame_info.frame_timestamp,
1223 card->jitter_history.get_expected_next_frame(),
1224 new_frames[master_card_index].length,
1225 output_frame_info.frame_duration,
1226 card->jitter_history.estimate_max_jitter(),
1227 output_jitter_history.estimate_max_jitter());
1228 trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1229 card->queue_length_policy.get_safe_queue_length()));
1233 // This might get off by a fractional sample when changing master card
1234 // between ones with different frame rates, but that's fine.
1235 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1236 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1237 fractional_samples = num_samples_times_timebase % TIMEBASE;
1238 assert(output_frame_info.num_samples >= 0);
1240 return output_frame_info;
1243 void Mixer::handle_hotplugged_cards()
1245 // Check for cards that have been disconnected since last frame.
1246 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1247 CaptureCard *card = &cards[card_index];
1248 if (card->capture->get_disconnected()) {
1249 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1250 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1251 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1252 card->queue_length_policy.reset(card_index);
1253 card->capture->start_bm_capture();
1257 // Check for cards that have been connected since last frame.
1258 vector<libusb_device *> hotplugged_cards_copy;
1260 lock_guard<mutex> lock(hotplug_mutex);
1261 swap(hotplugged_cards, hotplugged_cards_copy);
1263 for (libusb_device *new_dev : hotplugged_cards_copy) {
1264 // Look for a fake capture card where we can stick this in.
1265 int free_card_index = -1;
1266 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1267 if (cards[card_index].is_fake_capture) {
1268 free_card_index = card_index;
1273 if (free_card_index == -1) {
1274 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1275 libusb_unref_device(new_dev);
1277 // BMUSBCapture takes ownership.
1278 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1279 CaptureCard *card = &cards[free_card_index];
1280 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1281 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1282 card->queue_length_policy.reset(free_card_index);
1283 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1284 capture->start_bm_capture();
1290 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)
1292 // Resample the audio as needed, including from previously dropped frames.
1293 assert(num_cards > 0);
1294 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1295 const bool dropped_frame = (frame_num != dropped_frames);
1297 // Signal to the audio thread to process this frame.
1298 // Note that if the frame is a dropped frame, we signal that
1299 // we don't want to use this frame as base for adjusting
1300 // the resampler rate. The reason for this is that the timing
1301 // of these frames is often way too late; they typically don't
1302 // “arrive” before we synthesize them. Thus, we could end up
1303 // in a situation where we have inserted e.g. five audio frames
1304 // into the queue before we then start pulling five of them
1305 // back out. This makes ResamplingQueue overestimate the delay,
1306 // causing undue resampler changes. (We _do_ use the last,
1307 // non-dropped frame; perhaps we should just discard that as well,
1308 // since dropped frames are expected to be rare, and it might be
1309 // better to just wait until we have a slightly more normal situation).
1310 unique_lock<mutex> lock(audio_mutex);
1311 bool adjust_rate = !dropped_frame && !is_preroll;
1312 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1313 audio_task_queue_changed.notify_one();
1315 if (dropped_frame) {
1316 // For dropped frames, increase the pts. Note that if the format changed
1317 // in the meantime, we have no way of detecting that; we just have to
1318 // assume the frame length is always the same.
1319 pts_int += length_per_frame;
1324 void Mixer::render_one_frame(int64_t duration)
1326 // Determine the time code for this frame before we start rendering.
1327 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1328 if (display_timecode_on_stdout) {
1329 printf("Timecode: '%s'\n", timecode_text.c_str());
1332 // Update Y'CbCr settings for all cards.
1334 unique_lock<mutex> lock(card_mutex);
1335 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1336 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1337 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1338 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1339 input_state.full_range[card_index] = interpretation->full_range;
1343 // Get the main chain from the theme, and set its state immediately.
1344 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1345 EffectChain *chain = theme_main_chain.chain;
1346 theme_main_chain.setup_chain();
1347 //theme_main_chain.chain->enable_phase_timing(true);
1349 // The theme can't (or at least shouldn't!) call connect_signal() on
1350 // each FFmpeg or CEF input, so we'll do it here.
1351 for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_video_signal_connections()) {
1352 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1355 for (const pair<LiveInputWrapper *, CEFCapture *> &conn : theme->get_html_signal_connections()) {
1356 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1360 // If HDMI/SDI output is active and the user has requested auto mode,
1361 // its mode overrides the existing Y'CbCr setting for the chain.
1362 YCbCrLumaCoefficients ycbcr_output_coefficients;
1363 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1364 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1366 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1369 // TODO: Reduce the duplication against theme.cpp.
1370 YCbCrFormat output_ycbcr_format;
1371 output_ycbcr_format.chroma_subsampling_x = 1;
1372 output_ycbcr_format.chroma_subsampling_y = 1;
1373 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1374 output_ycbcr_format.full_range = false;
1375 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1376 chain->change_ycbcr_output_format(output_ycbcr_format);
1378 // Render main chain. If we're using zerocopy Quick Sync encoding
1379 // (the default case), we take an extra copy of the created outputs,
1380 // so that we can display it back to the screen later (it's less memory
1381 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1382 // Ideally, we'd like to avoid taking copies and just use the main textures
1383 // for display as well, but they're just views into VA-API memory and must be
1384 // unmapped during encoding, so we can't use them for display, unfortunately.
1385 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1386 GLuint y_copy_tex, cbcr_copy_tex = 0;
1387 GLuint y_display_tex, cbcr_display_tex;
1388 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1389 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1390 const bool is_zerocopy = video_encoder->is_zerocopy();
1392 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1393 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1394 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1396 y_display_tex = y_copy_tex;
1397 cbcr_display_tex = cbcr_copy_tex;
1399 // y_tex and cbcr_tex will be given by VideoEncoder.
1401 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1402 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1403 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1405 y_display_tex = y_tex;
1406 cbcr_display_tex = cbcr_tex;
1409 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1410 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1415 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1417 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1420 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1422 if (display_timecode_in_stream) {
1423 // Render the timecode on top.
1424 timecode_renderer->render_timecode(fbo, timecode_text);
1427 resource_pool->release_fbo(fbo);
1430 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1432 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1434 if (output_card_index != -1) {
1435 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1437 resource_pool->release_2d_texture(cbcr_full_tex);
1439 // Set the right state for the Y' and CbCr textures we use for display.
1440 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1441 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1442 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1443 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1444 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1446 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1447 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1448 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1449 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1451 RefCountedGLsync fence = video_encoder->end_frame();
1453 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1454 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1455 DisplayFrame live_frame;
1456 live_frame.chain = display_chain.get();
1457 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1458 display_input->set_texture_num(0, y_display_tex);
1459 display_input->set_texture_num(1, cbcr_display_tex);
1461 live_frame.ready_fence = fence;
1462 live_frame.input_frames = {};
1463 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1464 output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1466 // Set up preview and any additional channels.
1467 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1468 DisplayFrame display_frame;
1469 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1470 display_frame.chain = move(chain.chain);
1471 display_frame.setup_chain = move(chain.setup_chain);
1472 display_frame.ready_fence = fence;
1473 display_frame.input_frames = move(chain.input_frames);
1474 display_frame.temp_textures = {};
1475 output_channel[i].output_frame(move(display_frame));
1479 void Mixer::audio_thread_func()
1481 pthread_setname_np(pthread_self(), "Mixer_Audio");
1483 while (!should_quit) {
1487 unique_lock<mutex> lock(audio_mutex);
1488 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1492 task = audio_task_queue.front();
1493 audio_task_queue.pop();
1496 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1497 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1498 vector<float> samples_out = audio_mixer.get_output(
1499 task.frame_timestamp,
1501 rate_adjustment_policy);
1503 // Send the samples to the sound card, then add them to the output.
1505 alsa->write(samples_out);
1507 if (output_card_index != -1) {
1508 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1509 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1511 video_encoder->add_audio(task.pts_int, move(samples_out));
1515 void Mixer::release_display_frame(DisplayFrame *frame)
1517 for (GLuint texnum : frame->temp_textures) {
1518 resource_pool->release_2d_texture(texnum);
1520 frame->temp_textures.clear();
1521 frame->ready_fence.reset();
1522 frame->input_frames.clear();
1527 mixer_thread = thread(&Mixer::thread_func, this);
1528 audio_thread = thread(&Mixer::audio_thread_func, this);
1534 audio_task_queue_changed.notify_one();
1535 mixer_thread.join();
1536 audio_thread.join();
1539 void Mixer::transition_clicked(int transition_num)
1541 theme->transition_clicked(transition_num, pts());
1544 void Mixer::channel_clicked(int preview_num)
1546 theme->channel_clicked(preview_num);
1549 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1551 unique_lock<mutex> lock(card_mutex);
1552 return ycbcr_interpretation[card_index];
1555 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1557 unique_lock<mutex> lock(card_mutex);
1558 ycbcr_interpretation[card_index] = interpretation;
1561 void Mixer::start_mode_scanning(unsigned card_index)
1563 assert(card_index < num_cards);
1564 if (is_mode_scanning[card_index]) {
1567 is_mode_scanning[card_index] = true;
1568 mode_scanlist[card_index].clear();
1569 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1570 mode_scanlist[card_index].push_back(mode.first);
1572 assert(!mode_scanlist[card_index].empty());
1573 mode_scanlist_index[card_index] = 0;
1574 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1575 last_mode_scan_change[card_index] = steady_clock::now();
1578 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1580 assert(desired_output_card_index != -1);
1581 unique_lock<mutex> lock(card_mutex);
1582 return cards[desired_output_card_index].output->get_available_video_modes();
1585 Mixer::OutputChannel::~OutputChannel()
1587 if (has_current_frame) {
1588 parent->release_display_frame(¤t_frame);
1590 if (has_ready_frame) {
1591 parent->release_display_frame(&ready_frame);
1595 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1597 // Store this frame for display. Remove the ready frame if any
1598 // (it was seemingly never used).
1600 unique_lock<mutex> lock(frame_mutex);
1601 if (has_ready_frame) {
1602 parent->release_display_frame(&ready_frame);
1604 ready_frame = move(frame);
1605 has_ready_frame = true;
1607 // Call the callbacks under the mutex (they should be short),
1608 // so that we don't race against a callback removal.
1609 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1610 key_and_callback.second();
1614 // Reduce the number of callbacks by filtering duplicates. The reason
1615 // why we bother doing this is that Qt seemingly can get into a state
1616 // where its builds up an essentially unbounded queue of signals,
1617 // consuming more and more memory, and there's no good way of collapsing
1618 // user-defined signals or limiting the length of the queue.
1619 if (transition_names_updated_callback) {
1620 vector<string> transition_names = global_mixer->get_transition_names();
1621 bool changed = false;
1622 if (transition_names.size() != last_transition_names.size()) {
1625 for (unsigned i = 0; i < transition_names.size(); ++i) {
1626 if (transition_names[i] != last_transition_names[i]) {
1633 transition_names_updated_callback(transition_names);
1634 last_transition_names = transition_names;
1637 if (name_updated_callback) {
1638 string name = global_mixer->get_channel_name(channel);
1639 if (name != last_name) {
1640 name_updated_callback(name);
1644 if (color_updated_callback) {
1645 string color = global_mixer->get_channel_color(channel);
1646 if (color != last_color) {
1647 color_updated_callback(color);
1653 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1655 unique_lock<mutex> lock(frame_mutex);
1656 if (!has_current_frame && !has_ready_frame) {
1660 if (has_current_frame && has_ready_frame) {
1661 // We have a new ready frame. Toss the current one.
1662 parent->release_display_frame(¤t_frame);
1663 has_current_frame = false;
1665 if (has_ready_frame) {
1666 assert(!has_current_frame);
1667 current_frame = move(ready_frame);
1668 ready_frame.ready_fence.reset(); // Drop the refcount.
1669 ready_frame.input_frames.clear(); // Drop the refcounts.
1670 has_current_frame = true;
1671 has_ready_frame = false;
1674 *frame = current_frame;
1678 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1680 unique_lock<mutex> lock(frame_mutex);
1681 new_frame_ready_callbacks[key] = callback;
1684 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1686 unique_lock<mutex> lock(frame_mutex);
1687 new_frame_ready_callbacks.erase(key);
1690 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1692 transition_names_updated_callback = callback;
1695 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1697 name_updated_callback = callback;
1700 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1702 color_updated_callback = callback;
1705 mutex RefCountedGLsync::fence_lock;