7 #include <movit/effect_chain.h>
8 #include <movit/effect_util.h>
9 #include <movit/flat_input.h>
10 #include <movit/image_format.h>
11 #include <movit/init.h>
12 #include <movit/resource_pool.h>
19 #include <condition_variable>
30 #include "DeckLinkAPI.h"
32 #include "alsa_output.h"
33 #include "basic_stats.h"
34 #include "bmusb/bmusb.h"
35 #include "bmusb/fake_capture.h"
36 #include "chroma_subsampler.h"
38 #include "decklink_capture.h"
39 #include "decklink_output.h"
41 #include "disk_space_estimator.h"
42 #include "ffmpeg_capture.h"
44 #include "input_mapping.h"
46 #include "pbo_frame_allocator.h"
47 #include "ref_counted_gl_sync.h"
48 #include "resampling_queue.h"
50 #include "timecode_renderer.h"
51 #include "v210_converter.h"
52 #include "video_encoder.h"
55 #include <google/protobuf/util/json_util.h>
61 using namespace movit;
63 using namespace std::chrono;
64 using namespace std::placeholders;
65 using namespace bmusb;
67 Mixer *global_mixer = nullptr;
71 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
74 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
75 input_state->buffered_frames[card_index][frame_num] =
76 input_state->buffered_frames[card_index][frame_num - 1];
78 input_state->buffered_frames[card_index][0] = { frame, field_num };
80 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
81 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
86 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
89 switch (userdata->pixel_format) {
90 case PixelFormat_10BitYCbCr:
91 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
93 case PixelFormat_8BitYCbCr:
94 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
96 case PixelFormat_8BitBGRA:
97 first = userdata->tex_rgba[field] == 0;
99 case PixelFormat_8BitYCbCrPlanar:
100 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
107 width != userdata->last_width[field] ||
108 height != userdata->last_height[field] ||
109 cbcr_width != userdata->last_cbcr_width[field] ||
110 cbcr_height != userdata->last_cbcr_height[field]) {
111 // We changed resolution since last use of this texture, so we need to create
112 // a new object. Note that this each card has its own PBOFrameAllocator,
113 // we don't need to worry about these flip-flopping between resolutions.
114 switch (userdata->pixel_format) {
115 case PixelFormat_10BitYCbCr:
116 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
118 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
121 case PixelFormat_8BitYCbCr: {
122 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
124 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
126 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
128 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
132 case PixelFormat_8BitYCbCrPlanar: {
133 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
135 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
137 glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
139 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
141 glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
143 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
147 case PixelFormat_8BitBGRA:
148 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
150 if (global_flags.can_disable_srgb_decoder) { // See the comments in tweaked_inputs.h.
151 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
153 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
158 userdata->last_width[field] = width;
159 userdata->last_height[field] = height;
160 userdata->last_cbcr_width[field] = cbcr_width;
161 userdata->last_cbcr_height[field] = cbcr_height;
163 if (global_flags.ten_bit_input &&
164 (first || v210_width != userdata->last_v210_width[field])) {
165 // Same as above; we need to recreate the texture.
166 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
168 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
170 userdata->last_v210_width[field] = v210_width;
174 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
176 if (interlaced_stride) {
179 if (global_flags.flush_pbos) {
180 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
184 glBindTexture(GL_TEXTURE_2D, tex);
186 if (interlaced_stride) {
187 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
190 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
194 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
196 glBindTexture(GL_TEXTURE_2D, 0);
198 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
204 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
206 global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
207 global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
210 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
212 global_metrics.remove("input_underestimated_jitter_frames", labels);
213 global_metrics.remove("input_estimated_max_jitter_seconds", labels);
216 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
218 if (expected_timestamp > steady_clock::time_point::min()) {
219 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
220 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
221 history.push_back(orders.insert(jitter_seconds));
222 if (jitter_seconds > estimate_max_jitter()) {
223 ++metric_input_underestimated_jitter_frames;
226 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
228 if (history.size() > history_length) {
229 orders.erase(history.front());
232 assert(history.size() <= history_length);
234 expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
237 double JitterHistory::estimate_max_jitter() const
239 if (orders.empty()) {
242 size_t elem_idx = lrint((orders.size() - 1) * percentile);
243 if (percentile <= 0.5) {
244 return *next(orders.begin(), elem_idx) * multiplier;
246 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
250 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
252 global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
255 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
257 global_metrics.remove("input_queue_safe_length_frames", labels);
260 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
261 steady_clock::time_point expected_next_frame,
262 int64_t input_frame_duration,
263 int64_t master_frame_duration,
264 double max_input_card_jitter_seconds,
265 double max_master_card_jitter_seconds)
267 double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
268 double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
270 // Figure out when we can expect the next frame for this card, assuming
271 // worst-case jitter (ie., the frame is maximally late).
272 double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
274 // How many times are the master card expected to tick in that time?
275 // We assume the master clock has worst-case jitter but not any rate
276 // discrepancy, ie., it ticks as early as possible every time, but not
278 double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
280 // As a special case, if the master card ticks faster than the input card,
281 // we expect the queue to drain by itself even without dropping. But if
282 // the difference is small (e.g. 60 Hz master and 59.94 input), it would
283 // go slowly enough that the effect wouldn't really be appreciable.
284 // We account for this by looking at the situation five frames ahead,
285 // assuming everything else is the same.
286 double frames_allowed;
287 if (master_frame_duration < input_frame_duration) {
288 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
290 frames_allowed = frames_needed;
293 safe_queue_length = max<int>(floor(frames_allowed), 0);
294 metric_input_queue_safe_length_frames = safe_queue_length;
297 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
299 num_cards(num_cards),
300 mixer_surface(create_surface(format)),
301 h264_encoder_surface(create_surface(format)),
302 decklink_output_surface(create_surface(format)),
303 audio_mixer(num_cards)
305 memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
306 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
309 // This nearly always should be true.
310 global_flags.can_disable_srgb_decoder =
311 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
312 epoxy_has_gl_extension("GL_ARB_sampler_objects");
314 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
315 // will be halved when sampling them, and we need to compensate here.
316 movit_texel_subpixel_precision /= 2.0;
318 resource_pool.reset(new ResourcePool);
319 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
320 output_channel[i].parent = this;
321 output_channel[i].channel = i;
324 ImageFormat inout_format;
325 inout_format.color_space = COLORSPACE_sRGB;
326 inout_format.gamma_curve = GAMMA_sRGB;
328 // Matches the 4:2:0 format created by the main chain.
329 YCbCrFormat ycbcr_format;
330 ycbcr_format.chroma_subsampling_x = 2;
331 ycbcr_format.chroma_subsampling_y = 2;
332 if (global_flags.ycbcr_rec709_coefficients) {
333 ycbcr_format.luma_coefficients = YCBCR_REC_709;
335 ycbcr_format.luma_coefficients = YCBCR_REC_601;
337 ycbcr_format.full_range = false;
338 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
339 ycbcr_format.cb_x_position = 0.0f;
340 ycbcr_format.cr_x_position = 0.0f;
341 ycbcr_format.cb_y_position = 0.5f;
342 ycbcr_format.cr_y_position = 0.5f;
344 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
345 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
347 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
348 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
349 display_chain->add_input(display_input);
350 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
351 display_chain->set_dither_bits(0); // Don't bother.
352 display_chain->finalize();
354 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));
356 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
357 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
359 httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this));
360 for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
362 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx);
363 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx)));
366 // Start listening for clients only once VideoEncoder has written its header, if any.
367 httpd.start(global_flags.http_port);
369 // First try initializing the then PCI devices, then USB, then
370 // fill up with fake cards until we have the desired number of cards.
371 unsigned num_pci_devices = 0;
372 unsigned card_index = 0;
375 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
376 if (decklink_iterator != nullptr) {
377 for ( ; card_index < num_cards; ++card_index) {
379 if (decklink_iterator->Next(&decklink) != S_OK) {
383 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
384 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
385 if (!output->set_device(decklink)) {
389 configure_card(card_index, capture, CardType::LIVE_CARD, output);
392 decklink_iterator->Release();
393 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
395 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
399 unsigned num_usb_devices = BMUSBCapture::num_cards();
400 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
401 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
402 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
403 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
405 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
407 unsigned num_fake_cards = 0;
408 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
409 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
410 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
413 if (num_fake_cards > 0) {
414 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
417 // Initialize all video inputs the theme asked for. Note that these are
418 // all put _after_ the regular cards, which stop at <num_cards> - 1.
419 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
420 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
421 if (card_index >= MAX_VIDEO_CARDS) {
422 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
425 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
426 video_inputs[video_card_index]->set_card_index(card_index);
428 num_video_inputs = video_inputs.size();
430 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
431 BMUSBCapture::start_bm_thread();
433 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
434 cards[card_index].queue_length_policy.reset(card_index);
437 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
439 if (global_flags.ten_bit_input) {
440 if (!v210Converter::has_hardware_support()) {
441 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
442 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
445 v210_converter.reset(new v210Converter());
447 // These are all the widths listed in the Blackmagic SDK documentation
448 // (section 2.7.3, “Display Modes”).
449 v210_converter->precompile_shader(720);
450 v210_converter->precompile_shader(1280);
451 v210_converter->precompile_shader(1920);
452 v210_converter->precompile_shader(2048);
453 v210_converter->precompile_shader(3840);
454 v210_converter->precompile_shader(4096);
456 if (global_flags.ten_bit_output) {
457 if (!v210Converter::has_hardware_support()) {
458 fprintf(stderr, "ERROR: --ten-bit-output 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");
464 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
465 display_timecode_in_stream = global_flags.display_timecode_in_stream;
466 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
468 if (global_flags.enable_alsa_output) {
469 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
471 if (global_flags.output_card != -1) {
472 desired_output_card_index = global_flags.output_card;
473 set_output_card_internal(global_flags.output_card);
476 output_jitter_history.register_metrics({{ "card", "output" }});
481 BMUSBCapture::stop_bm_thread();
483 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
485 unique_lock<mutex> lock(card_mutex);
486 cards[card_index].should_quit = true; // Unblock thread.
487 cards[card_index].new_frames_changed.notify_all();
489 cards[card_index].capture->stop_dequeue_thread();
490 if (cards[card_index].output) {
491 cards[card_index].output->end_output();
492 cards[card_index].output.reset();
496 video_encoder.reset(nullptr);
499 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
501 printf("Configuring card %d...\n", card_index);
503 CaptureCard *card = &cards[card_index];
504 if (card->capture != nullptr) {
505 card->capture->stop_dequeue_thread();
507 card->capture.reset(capture);
508 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
509 card->type = card_type;
510 if (card->output.get() != output) {
511 card->output.reset(output);
514 PixelFormat pixel_format;
515 if (card_type == CardType::FFMPEG_INPUT) {
516 pixel_format = capture->get_current_pixel_format();
517 } else if (global_flags.ten_bit_input) {
518 pixel_format = PixelFormat_10BitYCbCr;
520 pixel_format = PixelFormat_8BitYCbCr;
523 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
524 if (card->frame_allocator == nullptr) {
525 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
527 card->capture->set_video_frame_allocator(card->frame_allocator.get());
528 if (card->surface == nullptr) {
529 card->surface = create_surface_with_same_format(mixer_surface);
531 while (!card->new_frames.empty()) card->new_frames.pop_front();
532 card->last_timecode = -1;
533 card->capture->set_pixel_format(pixel_format);
534 card->capture->configure_card();
536 // NOTE: start_bm_capture() happens in thread_func().
538 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
539 audio_mixer.reset_resampler(device);
540 audio_mixer.set_display_name(device, card->capture->get_description());
541 audio_mixer.trigger_state_changed_callback();
543 // Unregister old metrics, if any.
544 if (!card->labels.empty()) {
545 const vector<pair<string, string>> &labels = card->labels;
546 card->jitter_history.unregister_metrics(labels);
547 card->queue_length_policy.unregister_metrics(labels);
548 global_metrics.remove("input_received_frames", labels);
549 global_metrics.remove("input_dropped_frames_jitter", labels);
550 global_metrics.remove("input_dropped_frames_error", labels);
551 global_metrics.remove("input_dropped_frames_resets", labels);
552 global_metrics.remove("input_queue_length_frames", labels);
553 global_metrics.remove("input_queue_duped_frames", labels);
555 global_metrics.remove("input_has_signal_bool", labels);
556 global_metrics.remove("input_is_connected_bool", labels);
557 global_metrics.remove("input_interlaced_bool", labels);
558 global_metrics.remove("input_width_pixels", labels);
559 global_metrics.remove("input_height_pixels", labels);
560 global_metrics.remove("input_frame_rate_nom", labels);
561 global_metrics.remove("input_frame_rate_den", labels);
562 global_metrics.remove("input_sample_rate_hz", labels);
566 vector<pair<string, string>> labels;
568 snprintf(card_name, sizeof(card_name), "%d", card_index);
569 labels.emplace_back("card", card_name);
572 case CardType::LIVE_CARD:
573 labels.emplace_back("cardtype", "live");
575 case CardType::FAKE_CAPTURE:
576 labels.emplace_back("cardtype", "fake");
578 case CardType::FFMPEG_INPUT:
579 labels.emplace_back("cardtype", "ffmpeg");
584 card->jitter_history.register_metrics(labels);
585 card->queue_length_policy.register_metrics(labels);
586 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
587 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
588 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
589 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
590 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
591 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
593 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
594 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
595 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
596 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
597 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
598 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
599 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
600 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
601 card->labels = labels;
604 void Mixer::set_output_card_internal(int card_index)
606 // We don't really need to take card_mutex, since we're in the mixer
607 // thread and don't mess with any queues (which is the only thing that happens
608 // from other threads), but it's probably the safest in the long run.
609 unique_lock<mutex> lock(card_mutex);
610 if (output_card_index != -1) {
611 // Switch the old card from output to input.
612 CaptureCard *old_card = &cards[output_card_index];
613 old_card->output->end_output();
615 // Stop the fake card that we put into place.
616 // This needs to _not_ happen under the mutex, to avoid deadlock
617 // (delivering the last frame needs to take the mutex).
618 CaptureInterface *fake_capture = old_card->capture.get();
620 fake_capture->stop_dequeue_thread();
622 old_card->capture = move(old_card->parked_capture); // TODO: reset the metrics
623 old_card->is_fake_capture = false;
624 old_card->capture->start_bm_capture();
626 if (card_index != -1) {
627 CaptureCard *card = &cards[card_index];
628 CaptureInterface *capture = card->capture.get();
629 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
630 // several seconds to complete (blocking on DisableVideoInput);
631 // see if we can maybe do it asynchronously.
633 capture->stop_dequeue_thread();
635 card->parked_capture = move(card->capture);
636 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
637 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
638 card->queue_length_policy.reset(card_index);
639 card->capture->start_bm_capture();
640 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
641 card->output->start_output(desired_output_video_mode, pts_int);
643 output_card_index = card_index;
644 output_jitter_history.clear();
649 int unwrap_timecode(uint16_t current_wrapped, int last)
651 uint16_t last_wrapped = last & 0xffff;
652 if (current_wrapped > last_wrapped) {
653 return (last & ~0xffff) | current_wrapped;
655 return 0x10000 + ((last & ~0xffff) | current_wrapped);
661 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
662 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
663 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
665 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
666 CaptureCard *card = &cards[card_index];
668 ++card->metric_input_received_frames;
669 card->metric_input_has_signal_bool = video_format.has_signal;
670 card->metric_input_is_connected_bool = video_format.is_connected;
671 card->metric_input_interlaced_bool = video_format.interlaced;
672 card->metric_input_width_pixels = video_format.width;
673 card->metric_input_height_pixels = video_format.height;
674 card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
675 card->metric_input_frame_rate_den = video_format.frame_rate_den;
676 card->metric_input_sample_rate_hz = audio_format.sample_rate;
678 if (is_mode_scanning[card_index]) {
679 if (video_format.has_signal) {
680 // Found a stable signal, so stop scanning.
681 is_mode_scanning[card_index] = false;
683 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
684 steady_clock::time_point now = steady_clock::now();
685 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
686 if (sec_since_last_switch > switch_time_s) {
687 // It isn't this mode; try the next one.
688 mode_scanlist_index[card_index]++;
689 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
690 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
691 last_mode_scan_change[card_index] = now;
696 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
697 assert(frame_length > 0);
699 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;
700 if (num_samples > OUTPUT_FREQUENCY / 10) {
701 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",
702 card_index, int(audio_frame.len), int(audio_offset),
703 timecode, int(video_frame.len), int(video_offset), video_format.id);
704 if (video_frame.owner) {
705 video_frame.owner->release_frame(video_frame);
707 if (audio_frame.owner) {
708 audio_frame.owner->release_frame(audio_frame);
713 int dropped_frames = 0;
714 if (card->last_timecode != -1) {
715 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
718 // Number of samples per frame if we need to insert silence.
719 // (Could be nonintegral, but resampling will save us then.)
720 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
722 if (dropped_frames > MAX_FPS * 2) {
723 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
724 card_index, card->last_timecode, timecode);
725 audio_mixer.reset_resampler(device);
727 ++card->metric_input_resets;
728 } else if (dropped_frames > 0) {
729 // Insert silence as needed.
730 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
731 card_index, dropped_frames, timecode);
732 card->metric_input_dropped_frames_error += dropped_frames;
736 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
740 if (num_samples > 0) {
741 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
744 // Done with the audio, so release it.
745 if (audio_frame.owner) {
746 audio_frame.owner->release_frame(audio_frame);
749 card->last_timecode = timecode;
751 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
753 size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
754 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
755 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
756 // The calculation above is wrong for planar Y'CbCr, so just override it.
757 assert(card->type == CardType::FFMPEG_INPUT);
758 assert(video_offset == 0);
759 expected_length = video_frame.len;
761 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
762 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
763 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
764 cbcr_offset = video_format.width * video_format.height;
767 // All the other Y'CbCr formats are 4:2:2.
768 cbcr_width = video_format.width / 2;
769 cbcr_height = video_format.height;
770 cbcr_offset = video_offset / 2;
771 y_offset = video_frame.size / 2 + video_offset / 2;
773 if (video_frame.len - video_offset == 0 ||
774 video_frame.len - video_offset != expected_length) {
775 if (video_frame.len != 0) {
776 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
777 card_index, video_frame.len - video_offset, expected_length);
779 if (video_frame.owner) {
780 video_frame.owner->release_frame(video_frame);
783 // Still send on the information that we _had_ a frame, even though it's corrupted,
784 // so that pts can go up accordingly.
786 unique_lock<mutex> lock(card_mutex);
787 CaptureCard::NewFrame new_frame;
788 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
789 new_frame.length = frame_length;
790 new_frame.interlaced = false;
791 new_frame.dropped_frames = dropped_frames;
792 new_frame.received_timestamp = video_frame.received_timestamp;
793 card->new_frames.push_back(move(new_frame));
794 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
796 card->new_frames_changed.notify_all();
800 unsigned num_fields = video_format.interlaced ? 2 : 1;
801 steady_clock::time_point frame_upload_start;
802 bool interlaced_stride = false;
803 if (video_format.interlaced) {
804 // Send the two fields along as separate frames; the other side will need to add
805 // a deinterlacer to actually get this right.
806 assert(video_format.height % 2 == 0);
807 video_format.height /= 2;
809 assert(frame_length % 2 == 0);
812 if (video_format.second_field_start == 1) {
813 interlaced_stride = true;
815 frame_upload_start = steady_clock::now();
817 userdata->last_interlaced = video_format.interlaced;
818 userdata->last_has_signal = video_format.has_signal;
819 userdata->last_is_connected = video_format.is_connected;
820 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
821 userdata->last_frame_rate_den = video_format.frame_rate_den;
822 RefCountedFrame frame(video_frame);
824 // Upload the textures.
825 for (unsigned field = 0; field < num_fields; ++field) {
826 // Put the actual texture upload in a lambda that is executed in the main thread.
827 // It is entirely possible to do this in the same thread (and it might even be
828 // faster, depending on the GPU and driver), but it appears to be trickling
829 // driver bugs very easily.
831 // Note that this means we must hold on to the actual frame data in <userdata>
832 // until the upload command is run, but we hold on to <frame> much longer than that
833 // (in fact, all the way until we no longer use the texture in rendering).
834 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
835 unsigned field_start_line;
837 field_start_line = video_format.second_field_start;
839 field_start_line = video_format.extra_lines_top;
842 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
843 size_t v210_width = video_format.stride / sizeof(uint32_t);
844 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
846 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
849 switch (userdata->pixel_format) {
850 case PixelFormat_10BitYCbCr: {
851 size_t field_start = video_offset + video_format.stride * field_start_line;
852 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);
853 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
856 case PixelFormat_8BitYCbCr: {
857 size_t field_y_start = y_offset + video_format.width * field_start_line;
858 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
860 // Make up our own strides, since we are interleaving.
861 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);
862 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);
865 case PixelFormat_8BitYCbCrPlanar: {
866 assert(field_start_line == 0); // We don't really support interlaced here.
867 size_t field_y_start = y_offset;
868 size_t field_cb_start = cbcr_offset;
869 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
871 // Make up our own strides, since we are interleaving.
872 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);
873 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
874 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
877 case PixelFormat_8BitBGRA: {
878 size_t field_start = video_offset + video_format.stride * field_start_line;
879 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);
880 // These could be asked to deliver mipmaps at any time.
881 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
883 glGenerateMipmap(GL_TEXTURE_2D);
885 glBindTexture(GL_TEXTURE_2D, 0);
893 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
898 // Don't upload the second field as fast as we can; wait until
899 // the field time has approximately passed. (Otherwise, we could
900 // get timing jitter against the other sources, and possibly also
901 // against the video display, although the latter is not as critical.)
902 // This requires our system clock to be reasonably close to the
903 // video clock, but that's not an unreasonable assumption.
904 steady_clock::time_point second_field_start = frame_upload_start +
905 nanoseconds(frame_length * 1000000000 / TIMEBASE);
906 this_thread::sleep_until(second_field_start);
910 unique_lock<mutex> lock(card_mutex);
911 CaptureCard::NewFrame new_frame;
912 new_frame.frame = frame;
913 new_frame.length = frame_length;
914 new_frame.field = field;
915 new_frame.interlaced = video_format.interlaced;
916 new_frame.upload_func = upload_func;
917 new_frame.dropped_frames = dropped_frames;
918 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
919 card->new_frames.push_back(move(new_frame));
920 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
922 card->new_frames_changed.notify_all();
926 void Mixer::bm_hotplug_add(libusb_device *dev)
928 lock_guard<mutex> lock(hotplug_mutex);
929 hotplugged_cards.push_back(dev);
932 void Mixer::bm_hotplug_remove(unsigned card_index)
934 cards[card_index].new_frames_changed.notify_all();
937 void Mixer::thread_func()
939 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
941 eglBindAPI(EGL_OPENGL_API);
942 QOpenGLContext *context = create_context(mixer_surface);
943 if (!make_current(context, mixer_surface)) {
948 // Start the actual capture. (We don't want to do it before we're actually ready
949 // to process output frames.)
950 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
951 if (int(card_index) != output_card_index) {
952 cards[card_index].capture->start_bm_capture();
956 BasicStats basic_stats(/*verbose=*/true);
957 int stats_dropped_frames = 0;
959 while (!should_quit) {
960 if (desired_output_card_index != output_card_index) {
961 set_output_card_internal(desired_output_card_index);
963 if (output_card_index != -1 &&
964 desired_output_video_mode != output_video_mode) {
965 DeckLinkOutput *output = cards[output_card_index].output.get();
966 output->end_output();
967 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
968 output->start_output(desired_output_video_mode, pts_int);
971 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
972 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
974 bool master_card_is_output;
975 unsigned master_card_index;
976 if (output_card_index != -1) {
977 master_card_is_output = true;
978 master_card_index = output_card_index;
980 master_card_is_output = false;
981 master_card_index = theme->map_signal(master_clock_channel);
982 assert(master_card_index < num_cards);
985 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
986 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);
987 stats_dropped_frames += output_frame_info.dropped_frames;
989 handle_hotplugged_cards();
991 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
992 if (card_index == master_card_index || !has_new_frame[card_index]) {
995 if (new_frames[card_index].frame->len == 0) {
996 ++new_frames[card_index].dropped_frames;
998 if (new_frames[card_index].dropped_frames > 0) {
999 printf("Card %u dropped %d frames before this\n",
1000 card_index, int(new_frames[card_index].dropped_frames));
1004 // If the first card is reporting a corrupted or otherwise dropped frame,
1005 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1006 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1007 ++stats_dropped_frames;
1008 pts_int += new_frames[master_card_index].length;
1012 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
1013 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1016 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1017 assert(new_frame->frame != nullptr);
1018 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1021 // The new texture might need uploading before use.
1022 if (new_frame->upload_func) {
1023 new_frame->upload_func();
1024 new_frame->upload_func = nullptr;
1028 int64_t frame_duration = output_frame_info.frame_duration;
1029 render_one_frame(frame_duration);
1031 pts_int += frame_duration;
1033 basic_stats.update(frame_num, stats_dropped_frames);
1034 // if (frame_num % 100 == 0) chain->print_phase_timing();
1036 if (should_cut.exchange(false)) { // Test and clear.
1037 video_encoder->do_cut(frame_num);
1041 // Reset every 100 frames, so that local variations in frame times
1042 // (especially for the first few frames, when the shaders are
1043 // compiled etc.) don't make it hard to measure for the entire
1044 // remaining duration of the program.
1045 if (frame == 10000) {
1053 resource_pool->clean_context();
1056 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1058 if (output_card_index != -1) {
1059 // The output card (ie., cards[output_card_index].output) is the master clock,
1060 // so no input card (ie., cards[card_index].capture) is.
1063 return (card_index == master_card_index);
1066 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1068 // Count the number of frames in the queue, including any frames
1069 // we dropped. It's hard to know exactly how we should deal with
1070 // dropped (corrupted) input frames; they don't help our goal of
1071 // avoiding starvation, but they still add to the problem of latency.
1072 // Since dropped frames is going to mean a bump in the signal anyway,
1073 // we err on the side of having more stable latency instead.
1074 unsigned queue_length = 0;
1075 for (const CaptureCard::NewFrame &frame : card->new_frames) {
1076 queue_length += frame.dropped_frames + 1;
1079 // If needed, drop frames until the queue is below the safe limit.
1080 // We prefer to drop from the head, because all else being equal,
1081 // we'd like more recent frames (less latency).
1082 unsigned dropped_frames = 0;
1083 while (queue_length > safe_queue_length) {
1084 assert(!card->new_frames.empty());
1085 assert(queue_length > card->new_frames.front().dropped_frames);
1086 queue_length -= card->new_frames.front().dropped_frames;
1088 if (queue_length <= safe_queue_length) {
1089 // No need to drop anything.
1093 card->new_frames.pop_front();
1094 card->new_frames_changed.notify_all();
1099 card->metric_input_dropped_frames_jitter += dropped_frames;
1100 card->metric_input_queue_length_frames = queue_length;
1103 if (dropped_frames > 0) {
1104 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1105 card_index, dropped_frames);
1110 pair<string, string> Mixer::get_channels_json()
1113 for (int channel_idx = 2; channel_idx < theme->get_num_channels(); ++channel_idx) {
1114 Channel *channel = ret.add_channel();
1115 channel->set_index(channel_idx);
1116 channel->set_name(theme->get_channel_name(channel_idx));
1117 channel->set_color(theme->get_channel_color(channel_idx));
1120 google::protobuf::util::MessageToJsonString(ret, &contents); // Ignore any errors.
1121 return make_pair(contents, "text/json");
1124 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1126 return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1129 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])
1131 OutputFrameInfo output_frame_info;
1133 unique_lock<mutex> lock(card_mutex, defer_lock);
1134 if (master_card_is_output) {
1135 // Clocked to the output, so wait for it to be ready for the next frame.
1136 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);
1139 // Wait for the master card to have a new frame.
1140 // TODO: Add a timeout.
1141 output_frame_info.is_preroll = false;
1143 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(); });
1146 if (master_card_is_output) {
1147 handle_hotplugged_cards();
1148 } else if (cards[master_card_index].new_frames.empty()) {
1149 // We were woken up, but not due to a new frame. Deal with it
1150 // and then restart.
1151 assert(cards[master_card_index].capture->get_disconnected());
1152 handle_hotplugged_cards();
1157 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
1158 CaptureCard *card = &cards[card_index];
1159 if (card->new_frames.empty()) { // Starvation.
1160 ++card->metric_input_duped_frames;
1162 new_frames[card_index] = move(card->new_frames.front());
1163 has_new_frame[card_index] = true;
1164 card->new_frames.pop_front();
1165 card->new_frames_changed.notify_all();
1169 if (!master_card_is_output) {
1170 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1171 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1172 output_frame_info.frame_duration = new_frames[master_card_index].length;
1175 if (!output_frame_info.is_preroll) {
1176 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1179 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
1180 CaptureCard *card = &cards[card_index];
1181 if (has_new_frame[card_index] &&
1182 !input_card_is_master_clock(card_index, master_card_index) &&
1183 !output_frame_info.is_preroll) {
1184 card->queue_length_policy.update_policy(
1185 output_frame_info.frame_timestamp,
1186 card->jitter_history.get_expected_next_frame(),
1187 new_frames[master_card_index].length,
1188 output_frame_info.frame_duration,
1189 card->jitter_history.estimate_max_jitter(),
1190 output_jitter_history.estimate_max_jitter());
1191 trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1192 card->queue_length_policy.get_safe_queue_length()));
1196 // This might get off by a fractional sample when changing master card
1197 // between ones with different frame rates, but that's fine.
1198 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1199 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1200 fractional_samples = num_samples_times_timebase % TIMEBASE;
1201 assert(output_frame_info.num_samples >= 0);
1203 return output_frame_info;
1206 void Mixer::handle_hotplugged_cards()
1208 // Check for cards that have been disconnected since last frame.
1209 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1210 CaptureCard *card = &cards[card_index];
1211 if (card->capture->get_disconnected()) {
1212 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1213 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1214 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1215 card->queue_length_policy.reset(card_index);
1216 card->capture->start_bm_capture();
1220 // Check for cards that have been connected since last frame.
1221 vector<libusb_device *> hotplugged_cards_copy;
1223 lock_guard<mutex> lock(hotplug_mutex);
1224 swap(hotplugged_cards, hotplugged_cards_copy);
1226 for (libusb_device *new_dev : hotplugged_cards_copy) {
1227 // Look for a fake capture card where we can stick this in.
1228 int free_card_index = -1;
1229 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1230 if (cards[card_index].is_fake_capture) {
1231 free_card_index = card_index;
1236 if (free_card_index == -1) {
1237 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1238 libusb_unref_device(new_dev);
1240 // BMUSBCapture takes ownership.
1241 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1242 CaptureCard *card = &cards[free_card_index];
1243 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1244 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1245 card->queue_length_policy.reset(free_card_index);
1246 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1247 capture->start_bm_capture();
1253 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)
1255 // Resample the audio as needed, including from previously dropped frames.
1256 assert(num_cards > 0);
1257 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1258 const bool dropped_frame = (frame_num != dropped_frames);
1260 // Signal to the audio thread to process this frame.
1261 // Note that if the frame is a dropped frame, we signal that
1262 // we don't want to use this frame as base for adjusting
1263 // the resampler rate. The reason for this is that the timing
1264 // of these frames is often way too late; they typically don't
1265 // “arrive” before we synthesize them. Thus, we could end up
1266 // in a situation where we have inserted e.g. five audio frames
1267 // into the queue before we then start pulling five of them
1268 // back out. This makes ResamplingQueue overestimate the delay,
1269 // causing undue resampler changes. (We _do_ use the last,
1270 // non-dropped frame; perhaps we should just discard that as well,
1271 // since dropped frames are expected to be rare, and it might be
1272 // better to just wait until we have a slightly more normal situation).
1273 unique_lock<mutex> lock(audio_mutex);
1274 bool adjust_rate = !dropped_frame && !is_preroll;
1275 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1276 audio_task_queue_changed.notify_one();
1278 if (dropped_frame) {
1279 // For dropped frames, increase the pts. Note that if the format changed
1280 // in the meantime, we have no way of detecting that; we just have to
1281 // assume the frame length is always the same.
1282 pts_int += length_per_frame;
1287 void Mixer::render_one_frame(int64_t duration)
1289 // Determine the time code for this frame before we start rendering.
1290 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1291 if (display_timecode_on_stdout) {
1292 printf("Timecode: '%s'\n", timecode_text.c_str());
1295 // Update Y'CbCr settings for all cards.
1297 unique_lock<mutex> lock(card_mutex);
1298 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1299 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1300 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1301 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1302 input_state.full_range[card_index] = interpretation->full_range;
1306 // Get the main chain from the theme, and set its state immediately.
1307 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1308 EffectChain *chain = theme_main_chain.chain;
1309 theme_main_chain.setup_chain();
1310 //theme_main_chain.chain->enable_phase_timing(true);
1312 // The theme can't (or at least shouldn't!) call connect_signal() on
1313 // each FFmpeg input, so we'll do it here.
1314 for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_signal_connections()) {
1315 conn.first->connect_signal_raw(conn.second->get_card_index(), input_state);
1318 // If HDMI/SDI output is active and the user has requested auto mode,
1319 // its mode overrides the existing Y'CbCr setting for the chain.
1320 YCbCrLumaCoefficients ycbcr_output_coefficients;
1321 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1322 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1324 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1327 // TODO: Reduce the duplication against theme.cpp.
1328 YCbCrFormat output_ycbcr_format;
1329 output_ycbcr_format.chroma_subsampling_x = 1;
1330 output_ycbcr_format.chroma_subsampling_y = 1;
1331 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1332 output_ycbcr_format.full_range = false;
1333 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1334 chain->change_ycbcr_output_format(output_ycbcr_format);
1336 // Render main chain. If we're using zerocopy Quick Sync encoding
1337 // (the default case), we take an extra copy of the created outputs,
1338 // so that we can display it back to the screen later (it's less memory
1339 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1340 // Ideally, we'd like to avoid taking copies and just use the main textures
1341 // for display as well, but they're just views into VA-API memory and must be
1342 // unmapped during encoding, so we can't use them for display, unfortunately.
1343 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1344 GLuint y_copy_tex, cbcr_copy_tex = 0;
1345 GLuint y_display_tex, cbcr_display_tex;
1346 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1347 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1348 const bool is_zerocopy = video_encoder->is_zerocopy();
1350 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1351 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1352 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1354 y_display_tex = y_copy_tex;
1355 cbcr_display_tex = cbcr_copy_tex;
1357 // y_tex and cbcr_tex will be given by VideoEncoder.
1359 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1360 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1361 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1363 y_display_tex = y_tex;
1364 cbcr_display_tex = cbcr_tex;
1367 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1368 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1373 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1375 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1378 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1380 if (display_timecode_in_stream) {
1381 // Render the timecode on top.
1382 timecode_renderer->render_timecode(fbo, timecode_text);
1385 resource_pool->release_fbo(fbo);
1388 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1390 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1392 if (output_card_index != -1) {
1393 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1395 resource_pool->release_2d_texture(cbcr_full_tex);
1397 // Set the right state for the Y' and CbCr textures we use for display.
1398 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1399 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1400 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1401 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1402 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1404 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1405 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1406 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1407 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1409 RefCountedGLsync fence = video_encoder->end_frame();
1411 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1412 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1413 DisplayFrame live_frame;
1414 live_frame.chain = display_chain.get();
1415 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1416 display_input->set_texture_num(0, y_display_tex);
1417 display_input->set_texture_num(1, cbcr_display_tex);
1419 live_frame.ready_fence = fence;
1420 live_frame.input_frames = {};
1421 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1422 output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1424 // Set up preview and any additional channels.
1425 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1426 DisplayFrame display_frame;
1427 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1428 display_frame.chain = move(chain.chain);
1429 display_frame.setup_chain = move(chain.setup_chain);
1430 display_frame.ready_fence = fence;
1431 display_frame.input_frames = move(chain.input_frames);
1432 display_frame.temp_textures = {};
1433 output_channel[i].output_frame(move(display_frame));
1437 void Mixer::audio_thread_func()
1439 pthread_setname_np(pthread_self(), "Mixer_Audio");
1441 while (!should_quit) {
1445 unique_lock<mutex> lock(audio_mutex);
1446 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1450 task = audio_task_queue.front();
1451 audio_task_queue.pop();
1454 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1455 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1456 vector<float> samples_out = audio_mixer.get_output(
1457 task.frame_timestamp,
1459 rate_adjustment_policy);
1461 // Send the samples to the sound card, then add them to the output.
1463 alsa->write(samples_out);
1465 if (output_card_index != -1) {
1466 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1467 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1469 video_encoder->add_audio(task.pts_int, move(samples_out));
1473 void Mixer::release_display_frame(DisplayFrame *frame)
1475 for (GLuint texnum : frame->temp_textures) {
1476 resource_pool->release_2d_texture(texnum);
1478 frame->temp_textures.clear();
1479 frame->ready_fence.reset();
1480 frame->input_frames.clear();
1485 mixer_thread = thread(&Mixer::thread_func, this);
1486 audio_thread = thread(&Mixer::audio_thread_func, this);
1492 audio_task_queue_changed.notify_one();
1493 mixer_thread.join();
1494 audio_thread.join();
1497 void Mixer::transition_clicked(int transition_num)
1499 theme->transition_clicked(transition_num, pts());
1502 void Mixer::channel_clicked(int preview_num)
1504 theme->channel_clicked(preview_num);
1507 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1509 unique_lock<mutex> lock(card_mutex);
1510 return ycbcr_interpretation[card_index];
1513 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1515 unique_lock<mutex> lock(card_mutex);
1516 ycbcr_interpretation[card_index] = interpretation;
1519 void Mixer::start_mode_scanning(unsigned card_index)
1521 assert(card_index < num_cards);
1522 if (is_mode_scanning[card_index]) {
1525 is_mode_scanning[card_index] = true;
1526 mode_scanlist[card_index].clear();
1527 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1528 mode_scanlist[card_index].push_back(mode.first);
1530 assert(!mode_scanlist[card_index].empty());
1531 mode_scanlist_index[card_index] = 0;
1532 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1533 last_mode_scan_change[card_index] = steady_clock::now();
1536 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1538 assert(desired_output_card_index != -1);
1539 unique_lock<mutex> lock(card_mutex);
1540 return cards[desired_output_card_index].output->get_available_video_modes();
1543 Mixer::OutputChannel::~OutputChannel()
1545 if (has_current_frame) {
1546 parent->release_display_frame(¤t_frame);
1548 if (has_ready_frame) {
1549 parent->release_display_frame(&ready_frame);
1553 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1555 // Store this frame for display. Remove the ready frame if any
1556 // (it was seemingly never used).
1558 unique_lock<mutex> lock(frame_mutex);
1559 if (has_ready_frame) {
1560 parent->release_display_frame(&ready_frame);
1562 ready_frame = move(frame);
1563 has_ready_frame = true;
1565 // Call the callbacks under the mutex (they should be short),
1566 // so that we don't race against a callback removal.
1567 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1568 key_and_callback.second();
1572 // Reduce the number of callbacks by filtering duplicates. The reason
1573 // why we bother doing this is that Qt seemingly can get into a state
1574 // where its builds up an essentially unbounded queue of signals,
1575 // consuming more and more memory, and there's no good way of collapsing
1576 // user-defined signals or limiting the length of the queue.
1577 if (transition_names_updated_callback) {
1578 vector<string> transition_names = global_mixer->get_transition_names();
1579 bool changed = false;
1580 if (transition_names.size() != last_transition_names.size()) {
1583 for (unsigned i = 0; i < transition_names.size(); ++i) {
1584 if (transition_names[i] != last_transition_names[i]) {
1591 transition_names_updated_callback(transition_names);
1592 last_transition_names = transition_names;
1595 if (name_updated_callback) {
1596 string name = global_mixer->get_channel_name(channel);
1597 if (name != last_name) {
1598 name_updated_callback(name);
1602 if (color_updated_callback) {
1603 string color = global_mixer->get_channel_color(channel);
1604 if (color != last_color) {
1605 color_updated_callback(color);
1611 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1613 unique_lock<mutex> lock(frame_mutex);
1614 if (!has_current_frame && !has_ready_frame) {
1618 if (has_current_frame && has_ready_frame) {
1619 // We have a new ready frame. Toss the current one.
1620 parent->release_display_frame(¤t_frame);
1621 has_current_frame = false;
1623 if (has_ready_frame) {
1624 assert(!has_current_frame);
1625 current_frame = move(ready_frame);
1626 ready_frame.ready_fence.reset(); // Drop the refcount.
1627 ready_frame.input_frames.clear(); // Drop the refcounts.
1628 has_current_frame = true;
1629 has_ready_frame = false;
1632 *frame = current_frame;
1636 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1638 unique_lock<mutex> lock(frame_mutex);
1639 new_frame_ready_callbacks[key] = callback;
1642 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1644 unique_lock<mutex> lock(frame_mutex);
1645 new_frame_ready_callbacks.erase(key);
1648 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1650 transition_names_updated_callback = callback;
1653 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1655 name_updated_callback = callback;
1658 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1660 color_updated_callback = callback;
1663 mutex RefCountedGLsync::fence_lock;