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);
163 userdata->last_width[field] = width;
164 userdata->last_height[field] = height;
165 userdata->last_cbcr_width[field] = cbcr_width;
166 userdata->last_cbcr_height[field] = cbcr_height;
168 if (global_flags.ten_bit_input &&
169 (first || v210_width != userdata->last_v210_width[field])) {
170 // Same as above; we need to recreate the texture.
171 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
173 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
175 userdata->last_v210_width[field] = v210_width;
179 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
181 if (interlaced_stride) {
184 if (global_flags.flush_pbos) {
185 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
189 glBindTexture(GL_TEXTURE_2D, tex);
191 if (interlaced_stride) {
192 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
195 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
199 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
201 glBindTexture(GL_TEXTURE_2D, 0);
203 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
209 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
211 global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
212 global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
215 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
217 global_metrics.remove("input_underestimated_jitter_frames", labels);
218 global_metrics.remove("input_estimated_max_jitter_seconds", labels);
221 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
223 if (expected_timestamp > steady_clock::time_point::min()) {
224 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
225 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
226 history.push_back(orders.insert(jitter_seconds));
227 if (jitter_seconds > estimate_max_jitter()) {
228 ++metric_input_underestimated_jitter_frames;
231 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
233 if (history.size() > history_length) {
234 orders.erase(history.front());
237 assert(history.size() <= history_length);
239 expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
242 double JitterHistory::estimate_max_jitter() const
244 if (orders.empty()) {
247 size_t elem_idx = lrint((orders.size() - 1) * percentile);
248 if (percentile <= 0.5) {
249 return *next(orders.begin(), elem_idx) * multiplier;
251 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
255 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
257 global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
260 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
262 global_metrics.remove("input_queue_safe_length_frames", labels);
265 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
266 steady_clock::time_point expected_next_frame,
267 int64_t input_frame_duration,
268 int64_t master_frame_duration,
269 double max_input_card_jitter_seconds,
270 double max_master_card_jitter_seconds)
272 double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
273 double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
275 // Figure out when we can expect the next frame for this card, assuming
276 // worst-case jitter (ie., the frame is maximally late).
277 double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
279 // How many times are the master card expected to tick in that time?
280 // We assume the master clock has worst-case jitter but not any rate
281 // discrepancy, ie., it ticks as early as possible every time, but not
283 double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
285 // As a special case, if the master card ticks faster than the input card,
286 // we expect the queue to drain by itself even without dropping. But if
287 // the difference is small (e.g. 60 Hz master and 59.94 input), it would
288 // go slowly enough that the effect wouldn't really be appreciable.
289 // We account for this by looking at the situation five frames ahead,
290 // assuming everything else is the same.
291 double frames_allowed;
292 if (master_frame_duration < input_frame_duration) {
293 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
295 frames_allowed = frames_needed;
298 safe_queue_length = max<int>(floor(frames_allowed), 0);
299 metric_input_queue_safe_length_frames = safe_queue_length;
302 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
304 num_cards(num_cards),
305 mixer_surface(create_surface(format)),
306 h264_encoder_surface(create_surface(format)),
307 decklink_output_surface(create_surface(format))
309 memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
310 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
313 // This nearly always should be true.
314 global_flags.can_disable_srgb_decoder =
315 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
316 epoxy_has_gl_extension("GL_ARB_sampler_objects");
318 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
319 // will be halved when sampling them, and we need to compensate here.
320 movit_texel_subpixel_precision /= 2.0;
322 resource_pool.reset(new ResourcePool);
323 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
324 output_channel[i].parent = this;
325 output_channel[i].channel = i;
328 ImageFormat inout_format;
329 inout_format.color_space = COLORSPACE_sRGB;
330 inout_format.gamma_curve = GAMMA_sRGB;
332 // Matches the 4:2:0 format created by the main chain.
333 YCbCrFormat ycbcr_format;
334 ycbcr_format.chroma_subsampling_x = 2;
335 ycbcr_format.chroma_subsampling_y = 2;
336 if (global_flags.ycbcr_rec709_coefficients) {
337 ycbcr_format.luma_coefficients = YCBCR_REC_709;
339 ycbcr_format.luma_coefficients = YCBCR_REC_601;
341 ycbcr_format.full_range = false;
342 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
343 ycbcr_format.cb_x_position = 0.0f;
344 ycbcr_format.cr_x_position = 0.0f;
345 ycbcr_format.cb_y_position = 0.5f;
346 ycbcr_format.cr_y_position = 0.5f;
348 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
349 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
351 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
352 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
353 display_chain->add_input(display_input);
354 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
355 display_chain->set_dither_bits(0); // Don't bother.
356 display_chain->finalize();
358 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));
360 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
361 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
363 // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
364 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
365 audio_mixer.reset(new AudioMixer(num_cards, video_inputs.size()));
367 httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
368 for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
370 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx);
371 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx)), HTTPD::ALLOW_ALL_ORIGINS);
374 // Start listening for clients only once VideoEncoder has written its header, if any.
375 httpd.start(global_flags.http_port);
377 // First try initializing the then PCI devices, then USB, then
378 // fill up with fake cards until we have the desired number of cards.
379 unsigned num_pci_devices = 0;
380 unsigned card_index = 0;
383 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
384 if (decklink_iterator != nullptr) {
385 for ( ; card_index < num_cards; ++card_index) {
387 if (decklink_iterator->Next(&decklink) != S_OK) {
391 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
392 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
393 if (!output->set_device(decklink)) {
397 configure_card(card_index, capture, CardType::LIVE_CARD, output);
400 decklink_iterator->Release();
401 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
403 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
407 unsigned num_usb_devices = BMUSBCapture::num_cards();
408 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
409 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
410 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
411 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
413 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
415 unsigned num_fake_cards = 0;
416 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
417 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
418 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
421 if (num_fake_cards > 0) {
422 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
425 // Initialize all video inputs the theme asked for. Note that these are
426 // all put _after_ the regular cards, which stop at <num_cards> - 1.
427 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
428 if (card_index >= MAX_VIDEO_CARDS) {
429 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
432 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
433 video_inputs[video_card_index]->set_card_index(card_index);
435 num_video_inputs = video_inputs.size();
438 // Same, for HTML inputs.
439 std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
440 for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
441 if (card_index >= MAX_VIDEO_CARDS) {
442 fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
445 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr);
446 html_inputs[html_card_index]->set_card_index(card_index);
448 num_html_inputs = html_inputs.size();
451 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
452 BMUSBCapture::start_bm_thread();
454 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
455 cards[card_index].queue_length_policy.reset(card_index);
458 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
460 if (global_flags.ten_bit_input) {
461 if (!v210Converter::has_hardware_support()) {
462 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
463 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
466 v210_converter.reset(new v210Converter());
468 // These are all the widths listed in the Blackmagic SDK documentation
469 // (section 2.7.3, “Display Modes”).
470 v210_converter->precompile_shader(720);
471 v210_converter->precompile_shader(1280);
472 v210_converter->precompile_shader(1920);
473 v210_converter->precompile_shader(2048);
474 v210_converter->precompile_shader(3840);
475 v210_converter->precompile_shader(4096);
477 if (global_flags.ten_bit_output) {
478 if (!v210Converter::has_hardware_support()) {
479 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
480 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
485 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
486 display_timecode_in_stream = global_flags.display_timecode_in_stream;
487 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
489 if (global_flags.enable_alsa_output) {
490 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
492 if (global_flags.output_card != -1) {
493 desired_output_card_index = global_flags.output_card;
494 set_output_card_internal(global_flags.output_card);
497 output_jitter_history.register_metrics({{ "card", "output" }});
503 BMUSBCapture::stop_bm_thread();
505 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
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().
560 if (card_type == CardType::FFMPEG_INPUT) {
561 device = DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
563 device = DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
565 audio_mixer->reset_resampler(device);
566 audio_mixer->set_display_name(device, card->capture->get_description());
567 audio_mixer->trigger_state_changed_callback();
569 // Unregister old metrics, if any.
570 if (!card->labels.empty()) {
571 const vector<pair<string, string>> &labels = card->labels;
572 card->jitter_history.unregister_metrics(labels);
573 card->queue_length_policy.unregister_metrics(labels);
574 global_metrics.remove("input_received_frames", labels);
575 global_metrics.remove("input_dropped_frames_jitter", labels);
576 global_metrics.remove("input_dropped_frames_error", labels);
577 global_metrics.remove("input_dropped_frames_resets", labels);
578 global_metrics.remove("input_queue_length_frames", labels);
579 global_metrics.remove("input_queue_duped_frames", labels);
581 global_metrics.remove("input_has_signal_bool", labels);
582 global_metrics.remove("input_is_connected_bool", labels);
583 global_metrics.remove("input_interlaced_bool", labels);
584 global_metrics.remove("input_width_pixels", labels);
585 global_metrics.remove("input_height_pixels", labels);
586 global_metrics.remove("input_frame_rate_nom", labels);
587 global_metrics.remove("input_frame_rate_den", labels);
588 global_metrics.remove("input_sample_rate_hz", labels);
592 vector<pair<string, string>> labels;
594 snprintf(card_name, sizeof(card_name), "%d", card_index);
595 labels.emplace_back("card", card_name);
598 case CardType::LIVE_CARD:
599 labels.emplace_back("cardtype", "live");
601 case CardType::FAKE_CAPTURE:
602 labels.emplace_back("cardtype", "fake");
604 case CardType::FFMPEG_INPUT:
605 labels.emplace_back("cardtype", "ffmpeg");
607 case CardType::CEF_INPUT:
608 labels.emplace_back("cardtype", "cef");
613 card->jitter_history.register_metrics(labels);
614 card->queue_length_policy.register_metrics(labels);
615 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
616 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
617 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
618 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
619 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
620 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
622 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
623 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
624 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
625 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
626 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
627 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
628 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
629 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
630 card->labels = labels;
633 void Mixer::set_output_card_internal(int card_index)
635 // We don't really need to take card_mutex, since we're in the mixer
636 // thread and don't mess with any queues (which is the only thing that happens
637 // from other threads), but it's probably the safest in the long run.
638 unique_lock<mutex> lock(card_mutex);
639 if (output_card_index != -1) {
640 // Switch the old card from output to input.
641 CaptureCard *old_card = &cards[output_card_index];
642 old_card->output->end_output();
644 // Stop the fake card that we put into place.
645 // This needs to _not_ happen under the mutex, to avoid deadlock
646 // (delivering the last frame needs to take the mutex).
647 CaptureInterface *fake_capture = old_card->capture.get();
649 fake_capture->stop_dequeue_thread();
651 old_card->capture = move(old_card->parked_capture); // TODO: reset the metrics
652 old_card->is_fake_capture = false;
653 old_card->capture->start_bm_capture();
655 if (card_index != -1) {
656 CaptureCard *card = &cards[card_index];
657 CaptureInterface *capture = card->capture.get();
658 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
659 // several seconds to complete (blocking on DisableVideoInput);
660 // see if we can maybe do it asynchronously.
662 capture->stop_dequeue_thread();
664 card->parked_capture = move(card->capture);
665 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
666 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
667 card->queue_length_policy.reset(card_index);
668 card->capture->start_bm_capture();
669 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
670 card->output->start_output(desired_output_video_mode, pts_int);
672 output_card_index = card_index;
673 output_jitter_history.clear();
678 int unwrap_timecode(uint16_t current_wrapped, int last)
680 uint16_t last_wrapped = last & 0xffff;
681 if (current_wrapped > last_wrapped) {
682 return (last & ~0xffff) | current_wrapped;
684 return 0x10000 + ((last & ~0xffff) | current_wrapped);
688 DeviceSpec card_index_to_device(unsigned card_index, unsigned num_cards)
690 if (card_index >= num_cards) {
691 return DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
693 return DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
699 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
700 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
701 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
703 DeviceSpec device = card_index_to_device(card_index, num_cards);
704 CaptureCard *card = &cards[card_index];
706 ++card->metric_input_received_frames;
707 card->metric_input_has_signal_bool = video_format.has_signal;
708 card->metric_input_is_connected_bool = video_format.is_connected;
709 card->metric_input_interlaced_bool = video_format.interlaced;
710 card->metric_input_width_pixels = video_format.width;
711 card->metric_input_height_pixels = video_format.height;
712 card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
713 card->metric_input_frame_rate_den = video_format.frame_rate_den;
714 card->metric_input_sample_rate_hz = audio_format.sample_rate;
716 if (is_mode_scanning[card_index]) {
717 if (video_format.has_signal) {
718 // Found a stable signal, so stop scanning.
719 is_mode_scanning[card_index] = false;
721 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
722 steady_clock::time_point now = steady_clock::now();
723 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
724 if (sec_since_last_switch > switch_time_s) {
725 // It isn't this mode; try the next one.
726 mode_scanlist_index[card_index]++;
727 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
728 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
729 last_mode_scan_change[card_index] = now;
734 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
735 assert(frame_length > 0);
737 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;
738 if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
739 printf("%s: Dropping frame with implausible audio length (len=%d, offset=%d) [timecode=0x%04x video_len=%d video_offset=%d video_format=%x)\n",
740 spec_to_string(device).c_str(), int(audio_frame.len), int(audio_offset),
741 timecode, int(video_frame.len), int(video_offset), video_format.id);
742 if (video_frame.owner) {
743 video_frame.owner->release_frame(video_frame);
745 if (audio_frame.owner) {
746 audio_frame.owner->release_frame(audio_frame);
751 int dropped_frames = 0;
752 if (card->last_timecode != -1) {
753 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
756 // Number of samples per frame if we need to insert silence.
757 // (Could be nonintegral, but resampling will save us then.)
758 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
760 if (dropped_frames > MAX_FPS * 2) {
761 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
762 spec_to_string(device).c_str(), card->last_timecode, timecode);
763 audio_mixer->reset_resampler(device);
765 ++card->metric_input_resets;
766 } else if (dropped_frames > 0) {
767 // Insert silence as needed.
768 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
769 spec_to_string(device).c_str(), dropped_frames, timecode);
770 card->metric_input_dropped_frames_error += dropped_frames;
774 success = audio_mixer->add_silence(device, silence_samples, dropped_frames, frame_length);
778 if (num_samples > 0) {
779 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
782 // Done with the audio, so release it.
783 if (audio_frame.owner) {
784 audio_frame.owner->release_frame(audio_frame);
787 card->last_timecode = timecode;
789 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
791 size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
792 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
793 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
794 // The calculation above is wrong for planar Y'CbCr, so just override it.
795 assert(card->type == CardType::FFMPEG_INPUT);
796 assert(video_offset == 0);
797 expected_length = video_frame.len;
799 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
800 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
801 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
802 cbcr_offset = video_format.width * video_format.height;
805 // All the other Y'CbCr formats are 4:2:2.
806 cbcr_width = video_format.width / 2;
807 cbcr_height = video_format.height;
808 cbcr_offset = video_offset / 2;
809 y_offset = video_frame.size / 2 + video_offset / 2;
811 if (video_frame.len - video_offset == 0 ||
812 video_frame.len - video_offset != expected_length) {
813 if (video_frame.len != 0) {
814 printf("%s: Dropping video frame with wrong length (%ld; expected %ld)\n",
815 spec_to_string(device).c_str(), video_frame.len - video_offset, expected_length);
817 if (video_frame.owner) {
818 video_frame.owner->release_frame(video_frame);
821 // Still send on the information that we _had_ a frame, even though it's corrupted,
822 // so that pts can go up accordingly.
824 unique_lock<mutex> lock(card_mutex);
825 CaptureCard::NewFrame new_frame;
826 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
827 new_frame.length = frame_length;
828 new_frame.interlaced = false;
829 new_frame.dropped_frames = dropped_frames;
830 new_frame.received_timestamp = video_frame.received_timestamp;
831 card->new_frames.push_back(move(new_frame));
832 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
834 card->new_frames_changed.notify_all();
838 unsigned num_fields = video_format.interlaced ? 2 : 1;
839 steady_clock::time_point frame_upload_start;
840 bool interlaced_stride = false;
841 if (video_format.interlaced) {
842 // Send the two fields along as separate frames; the other side will need to add
843 // a deinterlacer to actually get this right.
844 assert(video_format.height % 2 == 0);
845 video_format.height /= 2;
847 assert(frame_length % 2 == 0);
850 if (video_format.second_field_start == 1) {
851 interlaced_stride = true;
853 frame_upload_start = steady_clock::now();
855 userdata->last_interlaced = video_format.interlaced;
856 userdata->last_has_signal = video_format.has_signal;
857 userdata->last_is_connected = video_format.is_connected;
858 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
859 userdata->last_frame_rate_den = video_format.frame_rate_den;
860 RefCountedFrame frame(video_frame);
862 // Upload the textures.
863 for (unsigned field = 0; field < num_fields; ++field) {
864 // Put the actual texture upload in a lambda that is executed in the main thread.
865 // It is entirely possible to do this in the same thread (and it might even be
866 // faster, depending on the GPU and driver), but it appears to be trickling
867 // driver bugs very easily.
869 // Note that this means we must hold on to the actual frame data in <userdata>
870 // until the upload command is run, but we hold on to <frame> much longer than that
871 // (in fact, all the way until we no longer use the texture in rendering).
872 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
873 unsigned field_start_line;
875 field_start_line = video_format.second_field_start;
877 field_start_line = video_format.extra_lines_top;
880 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
881 size_t v210_width = video_format.stride / sizeof(uint32_t);
882 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
884 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
887 switch (userdata->pixel_format) {
888 case PixelFormat_10BitYCbCr: {
889 size_t field_start = video_offset + video_format.stride * field_start_line;
890 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);
891 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
894 case PixelFormat_8BitYCbCr: {
895 size_t field_y_start = y_offset + video_format.width * field_start_line;
896 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
898 // Make up our own strides, since we are interleaving.
899 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);
900 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);
903 case PixelFormat_8BitYCbCrPlanar: {
904 assert(field_start_line == 0); // We don't really support interlaced here.
905 size_t field_y_start = y_offset;
906 size_t field_cb_start = cbcr_offset;
907 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
909 // Make up our own strides, since we are interleaving.
910 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);
911 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
912 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
915 case PixelFormat_8BitBGRA: {
916 size_t field_start = video_offset + video_format.stride * field_start_line;
917 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);
918 // These could be asked to deliver mipmaps at any time.
919 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
921 glGenerateMipmap(GL_TEXTURE_2D);
923 glBindTexture(GL_TEXTURE_2D, 0);
931 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
936 // Don't upload the second field as fast as we can; wait until
937 // the field time has approximately passed. (Otherwise, we could
938 // get timing jitter against the other sources, and possibly also
939 // against the video display, although the latter is not as critical.)
940 // This requires our system clock to be reasonably close to the
941 // video clock, but that's not an unreasonable assumption.
942 steady_clock::time_point second_field_start = frame_upload_start +
943 nanoseconds(frame_length * 1000000000 / TIMEBASE);
944 this_thread::sleep_until(second_field_start);
948 unique_lock<mutex> lock(card_mutex);
949 CaptureCard::NewFrame new_frame;
950 new_frame.frame = frame;
951 new_frame.length = frame_length;
952 new_frame.field = field;
953 new_frame.interlaced = video_format.interlaced;
954 new_frame.upload_func = upload_func;
955 new_frame.dropped_frames = dropped_frames;
956 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
957 card->new_frames.push_back(move(new_frame));
958 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
959 card->may_have_dropped_last_frame = false;
961 card->new_frames_changed.notify_all();
965 void Mixer::bm_hotplug_add(libusb_device *dev)
967 lock_guard<mutex> lock(hotplug_mutex);
968 hotplugged_cards.push_back(dev);
971 void Mixer::bm_hotplug_remove(unsigned card_index)
973 cards[card_index].new_frames_changed.notify_all();
976 void Mixer::thread_func()
978 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
980 eglBindAPI(EGL_OPENGL_API);
981 QOpenGLContext *context = create_context(mixer_surface);
982 if (!make_current(context, mixer_surface)) {
987 // Start the actual capture. (We don't want to do it before we're actually ready
988 // to process output frames.)
989 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
990 if (int(card_index) != output_card_index) {
991 cards[card_index].capture->start_bm_capture();
995 BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
996 int stats_dropped_frames = 0;
998 while (!should_quit) {
999 if (desired_output_card_index != output_card_index) {
1000 set_output_card_internal(desired_output_card_index);
1002 if (output_card_index != -1 &&
1003 desired_output_video_mode != output_video_mode) {
1004 DeckLinkOutput *output = cards[output_card_index].output.get();
1005 output->end_output();
1006 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1007 output->start_output(desired_output_video_mode, pts_int);
1010 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1011 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1013 bool master_card_is_output;
1014 unsigned master_card_index;
1015 if (output_card_index != -1) {
1016 master_card_is_output = true;
1017 master_card_index = output_card_index;
1019 master_card_is_output = false;
1020 master_card_index = theme->map_signal(master_clock_channel);
1021 assert(master_card_index < num_cards + num_video_inputs);
1024 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
1025 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);
1026 stats_dropped_frames += output_frame_info.dropped_frames;
1028 handle_hotplugged_cards();
1030 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1031 DeviceSpec device = card_index_to_device(card_index, num_cards);
1032 if (card_index == master_card_index || !has_new_frame[card_index]) {
1035 if (new_frames[card_index].frame->len == 0) {
1036 ++new_frames[card_index].dropped_frames;
1038 if (new_frames[card_index].dropped_frames > 0) {
1039 printf("%s dropped %d frames before this\n",
1040 spec_to_string(device).c_str(), int(new_frames[card_index].dropped_frames));
1044 // If the first card is reporting a corrupted or otherwise dropped frame,
1045 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1046 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1047 ++stats_dropped_frames;
1048 pts_int += new_frames[master_card_index].length;
1052 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1053 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1056 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1057 assert(new_frame->frame != nullptr);
1058 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1061 // The new texture might need uploading before use.
1062 if (new_frame->upload_func) {
1063 new_frame->upload_func();
1064 new_frame->upload_func = nullptr;
1068 int64_t frame_duration = output_frame_info.frame_duration;
1069 render_one_frame(frame_duration);
1071 lock_guard<mutex> lock(frame_num_mutex);
1074 frame_num_updated.notify_all();
1075 pts_int += frame_duration;
1077 basic_stats.update(frame_num, stats_dropped_frames);
1078 // if (frame_num % 100 == 0) chain->print_phase_timing();
1080 if (should_cut.exchange(false)) { // Test and clear.
1081 video_encoder->do_cut(frame_num);
1085 // Reset every 100 frames, so that local variations in frame times
1086 // (especially for the first few frames, when the shaders are
1087 // compiled etc.) don't make it hard to measure for the entire
1088 // remaining duration of the program.
1089 if (frame == 10000) {
1097 resource_pool->clean_context();
1100 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1102 if (output_card_index != -1) {
1103 // The output card (ie., cards[output_card_index].output) is the master clock,
1104 // so no input card (ie., cards[card_index].capture) is.
1107 return (card_index == master_card_index);
1110 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1112 // Count the number of frames in the queue, including any frames
1113 // we dropped. It's hard to know exactly how we should deal with
1114 // dropped (corrupted) input frames; they don't help our goal of
1115 // avoiding starvation, but they still add to the problem of latency.
1116 // Since dropped frames is going to mean a bump in the signal anyway,
1117 // we err on the side of having more stable latency instead.
1118 unsigned queue_length = 0;
1119 for (const CaptureCard::NewFrame &frame : card->new_frames) {
1120 queue_length += frame.dropped_frames + 1;
1123 // If needed, drop frames until the queue is below the safe limit.
1124 // We prefer to drop from the head, because all else being equal,
1125 // we'd like more recent frames (less latency).
1126 unsigned dropped_frames = 0;
1127 while (queue_length > safe_queue_length) {
1128 assert(!card->new_frames.empty());
1129 assert(queue_length > card->new_frames.front().dropped_frames);
1130 queue_length -= card->new_frames.front().dropped_frames;
1132 if (queue_length <= safe_queue_length) {
1133 // No need to drop anything.
1137 card->new_frames.pop_front();
1138 card->new_frames_changed.notify_all();
1142 if (queue_length == 0 && card->is_cef_capture) {
1143 card->may_have_dropped_last_frame = true;
1147 card->metric_input_dropped_frames_jitter += dropped_frames;
1148 card->metric_input_queue_length_frames = queue_length;
1151 if (dropped_frames > 0) {
1152 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1153 card_index, dropped_frames);
1158 pair<string, string> Mixer::get_channels_json()
1161 for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
1162 Channel *channel = ret.add_channel();
1163 channel->set_index(channel_idx);
1164 channel->set_name(theme->get_channel_name(channel_idx));
1165 channel->set_color(theme->get_channel_color(channel_idx));
1168 google::protobuf::util::MessageToJsonString(ret, &contents); // Ignore any errors.
1169 return make_pair(contents, "text/json");
1172 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1174 return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1177 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])
1179 OutputFrameInfo output_frame_info;
1181 unique_lock<mutex> lock(card_mutex, defer_lock);
1182 if (master_card_is_output) {
1183 // Clocked to the output, so wait for it to be ready for the next frame.
1184 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);
1187 // Wait for the master card to have a new frame.
1188 // TODO: Add a timeout.
1189 output_frame_info.is_preroll = false;
1191 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(); });
1194 if (master_card_is_output) {
1195 handle_hotplugged_cards();
1196 } else if (cards[master_card_index].new_frames.empty()) {
1197 // We were woken up, but not due to a new frame. Deal with it
1198 // and then restart.
1199 assert(cards[master_card_index].capture->get_disconnected());
1200 handle_hotplugged_cards();
1205 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1206 CaptureCard *card = &cards[card_index];
1207 if (card->new_frames.empty()) { // Starvation.
1208 ++card->metric_input_duped_frames;
1210 if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1211 // Unlike other sources, CEF is not guaranteed to send us a steady
1212 // stream of frames, so we'll have to ask it to repaint the frame
1213 // we dropped. (may_have_dropped_last_frame is set whenever we
1214 // trim the queue completely away, and cleared when we actually
1215 // get a new frame.)
1216 ((CEFCapture *)card->capture.get())->request_new_frame();
1220 new_frames[card_index] = move(card->new_frames.front());
1221 has_new_frame[card_index] = true;
1222 card->new_frames.pop_front();
1223 card->new_frames_changed.notify_all();
1227 if (!master_card_is_output) {
1228 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1229 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1230 output_frame_info.frame_duration = new_frames[master_card_index].length;
1233 if (!output_frame_info.is_preroll) {
1234 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1237 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1238 CaptureCard *card = &cards[card_index];
1239 if (has_new_frame[card_index] &&
1240 !input_card_is_master_clock(card_index, master_card_index) &&
1241 !output_frame_info.is_preroll) {
1242 card->queue_length_policy.update_policy(
1243 output_frame_info.frame_timestamp,
1244 card->jitter_history.get_expected_next_frame(),
1245 new_frames[master_card_index].length,
1246 output_frame_info.frame_duration,
1247 card->jitter_history.estimate_max_jitter(),
1248 output_jitter_history.estimate_max_jitter());
1249 trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1250 card->queue_length_policy.get_safe_queue_length()));
1254 // This might get off by a fractional sample when changing master card
1255 // between ones with different frame rates, but that's fine.
1256 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1257 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1258 fractional_samples = num_samples_times_timebase % TIMEBASE;
1259 assert(output_frame_info.num_samples >= 0);
1261 return output_frame_info;
1264 void Mixer::handle_hotplugged_cards()
1266 // Check for cards that have been disconnected since last frame.
1267 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1268 CaptureCard *card = &cards[card_index];
1269 if (card->capture->get_disconnected()) {
1270 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1271 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1272 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1273 card->queue_length_policy.reset(card_index);
1274 card->capture->start_bm_capture();
1278 // Check for cards that have been connected since last frame.
1279 vector<libusb_device *> hotplugged_cards_copy;
1281 lock_guard<mutex> lock(hotplug_mutex);
1282 swap(hotplugged_cards, hotplugged_cards_copy);
1284 for (libusb_device *new_dev : hotplugged_cards_copy) {
1285 // Look for a fake capture card where we can stick this in.
1286 int free_card_index = -1;
1287 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1288 if (cards[card_index].is_fake_capture) {
1289 free_card_index = card_index;
1294 if (free_card_index == -1) {
1295 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1296 libusb_unref_device(new_dev);
1298 // BMUSBCapture takes ownership.
1299 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1300 CaptureCard *card = &cards[free_card_index];
1301 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1302 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1303 card->queue_length_policy.reset(free_card_index);
1304 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1305 capture->start_bm_capture();
1311 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)
1313 // Resample the audio as needed, including from previously dropped frames.
1314 assert(num_cards > 0);
1315 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1316 const bool dropped_frame = (frame_num != dropped_frames);
1318 // Signal to the audio thread to process this frame.
1319 // Note that if the frame is a dropped frame, we signal that
1320 // we don't want to use this frame as base for adjusting
1321 // the resampler rate. The reason for this is that the timing
1322 // of these frames is often way too late; they typically don't
1323 // “arrive” before we synthesize them. Thus, we could end up
1324 // in a situation where we have inserted e.g. five audio frames
1325 // into the queue before we then start pulling five of them
1326 // back out. This makes ResamplingQueue overestimate the delay,
1327 // causing undue resampler changes. (We _do_ use the last,
1328 // non-dropped frame; perhaps we should just discard that as well,
1329 // since dropped frames are expected to be rare, and it might be
1330 // better to just wait until we have a slightly more normal situation).
1331 unique_lock<mutex> lock(audio_mutex);
1332 bool adjust_rate = !dropped_frame && !is_preroll;
1333 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1334 audio_task_queue_changed.notify_one();
1336 if (dropped_frame) {
1337 // For dropped frames, increase the pts. Note that if the format changed
1338 // in the meantime, we have no way of detecting that; we just have to
1339 // assume the frame length is always the same.
1340 pts_int += length_per_frame;
1345 void Mixer::render_one_frame(int64_t duration)
1347 // Determine the time code for this frame before we start rendering.
1348 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1349 if (display_timecode_on_stdout) {
1350 printf("Timecode: '%s'\n", timecode_text.c_str());
1353 // Update Y'CbCr settings for all cards.
1355 unique_lock<mutex> lock(card_mutex);
1356 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1357 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1358 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1359 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1360 input_state.full_range[card_index] = interpretation->full_range;
1364 // Get the main chain from the theme, and set its state immediately.
1365 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1366 EffectChain *chain = theme_main_chain.chain;
1367 theme_main_chain.setup_chain();
1368 //theme_main_chain.chain->enable_phase_timing(true);
1370 // If HDMI/SDI output is active and the user has requested auto mode,
1371 // its mode overrides the existing Y'CbCr setting for the chain.
1372 YCbCrLumaCoefficients ycbcr_output_coefficients;
1373 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1374 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1376 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1379 // TODO: Reduce the duplication against theme.cpp.
1380 YCbCrFormat output_ycbcr_format;
1381 output_ycbcr_format.chroma_subsampling_x = 1;
1382 output_ycbcr_format.chroma_subsampling_y = 1;
1383 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1384 output_ycbcr_format.full_range = false;
1385 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1386 chain->change_ycbcr_output_format(output_ycbcr_format);
1388 // Render main chain. If we're using zerocopy Quick Sync encoding
1389 // (the default case), we take an extra copy of the created outputs,
1390 // so that we can display it back to the screen later (it's less memory
1391 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1392 // Ideally, we'd like to avoid taking copies and just use the main textures
1393 // for display as well, but they're just views into VA-API memory and must be
1394 // unmapped during encoding, so we can't use them for display, unfortunately.
1395 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1396 GLuint y_copy_tex, cbcr_copy_tex = 0;
1397 GLuint y_display_tex, cbcr_display_tex;
1398 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1399 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1400 const bool is_zerocopy = video_encoder->is_zerocopy();
1402 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1403 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1404 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1406 y_display_tex = y_copy_tex;
1407 cbcr_display_tex = cbcr_copy_tex;
1409 // y_tex and cbcr_tex will be given by VideoEncoder.
1411 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1412 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1413 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1415 y_display_tex = y_tex;
1416 cbcr_display_tex = cbcr_tex;
1419 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1420 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1425 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1427 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1430 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1432 if (display_timecode_in_stream) {
1433 // Render the timecode on top.
1434 timecode_renderer->render_timecode(fbo, timecode_text);
1437 resource_pool->release_fbo(fbo);
1440 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1442 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1444 if (output_card_index != -1) {
1445 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1447 resource_pool->release_2d_texture(cbcr_full_tex);
1449 // Set the right state for the Y' and CbCr textures we use for display.
1450 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1451 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1452 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1453 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1454 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1456 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1457 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1458 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1459 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1461 RefCountedGLsync fence = video_encoder->end_frame();
1463 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1464 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1465 DisplayFrame live_frame;
1466 live_frame.chain = display_chain.get();
1467 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1468 display_input->set_texture_num(0, y_display_tex);
1469 display_input->set_texture_num(1, cbcr_display_tex);
1471 live_frame.ready_fence = fence;
1472 live_frame.input_frames = {};
1473 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1474 output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1476 // Set up preview and any additional channels.
1477 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1478 DisplayFrame display_frame;
1479 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1480 display_frame.chain = move(chain.chain);
1481 display_frame.setup_chain = move(chain.setup_chain);
1482 display_frame.ready_fence = fence;
1483 display_frame.input_frames = move(chain.input_frames);
1484 display_frame.temp_textures = {};
1485 output_channel[i].output_frame(move(display_frame));
1489 void Mixer::audio_thread_func()
1491 pthread_setname_np(pthread_self(), "Mixer_Audio");
1493 while (!should_quit) {
1497 unique_lock<mutex> lock(audio_mutex);
1498 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1502 task = audio_task_queue.front();
1503 audio_task_queue.pop();
1506 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1507 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1508 vector<float> samples_out = audio_mixer->get_output(
1509 task.frame_timestamp,
1511 rate_adjustment_policy);
1513 // Send the samples to the sound card, then add them to the output.
1515 alsa->write(samples_out);
1517 if (output_card_index != -1) {
1518 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1519 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1521 video_encoder->add_audio(task.pts_int, move(samples_out));
1525 void Mixer::release_display_frame(DisplayFrame *frame)
1527 for (GLuint texnum : frame->temp_textures) {
1528 resource_pool->release_2d_texture(texnum);
1530 frame->temp_textures.clear();
1531 frame->ready_fence.reset();
1532 frame->input_frames.clear();
1537 mixer_thread = thread(&Mixer::thread_func, this);
1538 audio_thread = thread(&Mixer::audio_thread_func, this);
1544 audio_task_queue_changed.notify_one();
1545 mixer_thread.join();
1546 audio_thread.join();
1549 void Mixer::transition_clicked(int transition_num)
1551 theme->transition_clicked(transition_num, pts());
1554 void Mixer::channel_clicked(int preview_num)
1556 theme->channel_clicked(preview_num);
1559 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1561 unique_lock<mutex> lock(card_mutex);
1562 return ycbcr_interpretation[card_index];
1565 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1567 unique_lock<mutex> lock(card_mutex);
1568 ycbcr_interpretation[card_index] = interpretation;
1571 void Mixer::start_mode_scanning(unsigned card_index)
1573 assert(card_index < num_cards);
1574 if (is_mode_scanning[card_index]) {
1577 is_mode_scanning[card_index] = true;
1578 mode_scanlist[card_index].clear();
1579 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1580 mode_scanlist[card_index].push_back(mode.first);
1582 assert(!mode_scanlist[card_index].empty());
1583 mode_scanlist_index[card_index] = 0;
1584 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1585 last_mode_scan_change[card_index] = steady_clock::now();
1588 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1590 assert(desired_output_card_index != -1);
1591 unique_lock<mutex> lock(card_mutex);
1592 return cards[desired_output_card_index].output->get_available_video_modes();
1595 string Mixer::get_ffmpeg_filename(unsigned card_index) const
1597 assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1598 return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
1601 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
1602 assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1603 ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
1606 void Mixer::wait_for_next_frame()
1608 unique_lock<mutex> lock(frame_num_mutex);
1609 unsigned old_frame_num = frame_num;
1610 frame_num_updated.wait_for(lock, seconds(1), // Timeout is just in case.
1611 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
1614 Mixer::OutputChannel::~OutputChannel()
1616 if (has_current_frame) {
1617 parent->release_display_frame(¤t_frame);
1619 if (has_ready_frame) {
1620 parent->release_display_frame(&ready_frame);
1624 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1626 // Store this frame for display. Remove the ready frame if any
1627 // (it was seemingly never used).
1629 unique_lock<mutex> lock(frame_mutex);
1630 if (has_ready_frame) {
1631 parent->release_display_frame(&ready_frame);
1633 ready_frame = move(frame);
1634 has_ready_frame = true;
1636 // Call the callbacks under the mutex (they should be short),
1637 // so that we don't race against a callback removal.
1638 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1639 key_and_callback.second();
1643 // Reduce the number of callbacks by filtering duplicates. The reason
1644 // why we bother doing this is that Qt seemingly can get into a state
1645 // where its builds up an essentially unbounded queue of signals,
1646 // consuming more and more memory, and there's no good way of collapsing
1647 // user-defined signals or limiting the length of the queue.
1648 if (transition_names_updated_callback) {
1649 vector<string> transition_names = global_mixer->get_transition_names();
1650 bool changed = false;
1651 if (transition_names.size() != last_transition_names.size()) {
1654 for (unsigned i = 0; i < transition_names.size(); ++i) {
1655 if (transition_names[i] != last_transition_names[i]) {
1662 transition_names_updated_callback(transition_names);
1663 last_transition_names = transition_names;
1666 if (name_updated_callback) {
1667 string name = global_mixer->get_channel_name(channel);
1668 if (name != last_name) {
1669 name_updated_callback(name);
1673 if (color_updated_callback) {
1674 string color = global_mixer->get_channel_color(channel);
1675 if (color != last_color) {
1676 color_updated_callback(color);
1682 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1684 unique_lock<mutex> lock(frame_mutex);
1685 if (!has_current_frame && !has_ready_frame) {
1689 if (has_current_frame && has_ready_frame) {
1690 // We have a new ready frame. Toss the current one.
1691 parent->release_display_frame(¤t_frame);
1692 has_current_frame = false;
1694 if (has_ready_frame) {
1695 assert(!has_current_frame);
1696 current_frame = move(ready_frame);
1697 ready_frame.ready_fence.reset(); // Drop the refcount.
1698 ready_frame.input_frames.clear(); // Drop the refcounts.
1699 has_current_frame = true;
1700 has_ready_frame = false;
1703 *frame = current_frame;
1707 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1709 unique_lock<mutex> lock(frame_mutex);
1710 new_frame_ready_callbacks[key] = callback;
1713 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1715 unique_lock<mutex> lock(frame_mutex);
1716 new_frame_ready_callbacks.erase(key);
1719 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1721 transition_names_updated_callback = callback;
1724 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1726 name_updated_callback = callback;
1729 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1731 color_updated_callback = callback;
1734 mutex RefCountedGLsync::fence_lock;