7 #include <movit/effect.h>
8 #include <movit/effect_chain.h>
9 #include <movit/effect_util.h>
10 #include <movit/flat_input.h>
11 #include <movit/image_format.h>
12 #include <movit/init.h>
13 #include <movit/resource_pool.h>
20 #include <condition_variable>
31 #include "DeckLinkAPI.h"
33 #include "alsa_output.h"
34 #include "basic_stats.h"
35 #include "bmusb/bmusb.h"
36 #include "bmusb/fake_capture.h"
38 #include "cef_capture.h"
40 #include "chroma_subsampler.h"
41 #include "shared/context.h"
42 #include "decklink_capture.h"
43 #include "decklink_output.h"
45 #include "shared/disk_space_estimator.h"
46 #include "ffmpeg_capture.h"
48 #include "image_input.h"
49 #include "input_mapping.h"
50 #include "shared/metrics.h"
51 #include "shared/va_display.h"
52 #include "mjpeg_encoder.h"
53 #include "pbo_frame_allocator.h"
54 #include "shared/ref_counted_gl_sync.h"
55 #include "resampling_queue.h"
56 #include "shared/timebase.h"
57 #include "timecode_renderer.h"
58 #include "v210_converter.h"
59 #include "video_encoder.h"
62 #include <google/protobuf/util/json_util.h>
66 // Must come after CEF, since it includes <syslog.h>, which has #defines
67 // that conflict with CEF logging constants.
74 using namespace movit;
76 using namespace std::chrono;
77 using namespace std::placeholders;
78 using namespace bmusb;
80 Mixer *global_mixer = nullptr;
84 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
87 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
88 input_state->buffered_frames[card_index][frame_num] =
89 input_state->buffered_frames[card_index][frame_num - 1];
91 input_state->buffered_frames[card_index][0] = { frame, field_num };
93 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
94 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
99 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
102 switch (userdata->pixel_format) {
103 case PixelFormat_10BitYCbCr:
104 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
106 case PixelFormat_8BitYCbCr:
107 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
109 case PixelFormat_8BitBGRA:
110 first = userdata->tex_rgba[field] == 0;
112 case PixelFormat_8BitYCbCrPlanar:
113 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
119 const bool recreate_main_texture =
121 width != userdata->last_width[field] ||
122 height != userdata->last_height[field] ||
123 cbcr_width != userdata->last_cbcr_width[field] ||
124 cbcr_height != userdata->last_cbcr_height[field];
125 const bool recreate_v210_texture =
126 global_flags.ten_bit_input &&
127 (first || v210_width != userdata->last_v210_width[field] || height != userdata->last_height[field]);
129 if (recreate_main_texture) {
130 // We changed resolution since last use of this texture, so we need to create
131 // a new object. Note that this each card has its own PBOFrameAllocator,
132 // we don't need to worry about these flip-flopping between resolutions.
133 switch (userdata->pixel_format) {
134 case PixelFormat_10BitYCbCr:
135 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
137 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
140 case PixelFormat_8BitYCbCr: {
141 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
143 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
145 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
147 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
151 case PixelFormat_8BitYCbCrPlanar: {
152 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
154 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
156 glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
158 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
160 glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
162 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
166 case PixelFormat_8BitBGRA:
167 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
169 // NOTE: sRGB may be disabled by sRGBSwitchingFlatInput.
170 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
176 userdata->last_width[field] = width;
177 userdata->last_height[field] = height;
178 userdata->last_cbcr_width[field] = cbcr_width;
179 userdata->last_cbcr_height[field] = cbcr_height;
181 if (recreate_v210_texture) {
182 // Same as above; we need to recreate the texture.
183 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
185 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
187 userdata->last_v210_width[field] = v210_width;
188 userdata->last_height[field] = height;
192 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
194 if (interlaced_stride) {
197 if (global_flags.flush_pbos) {
198 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
202 glBindTexture(GL_TEXTURE_2D, tex);
204 if (interlaced_stride) {
205 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
208 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
212 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
214 glBindTexture(GL_TEXTURE_2D, 0);
216 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
222 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
224 global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
225 global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
228 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
230 global_metrics.remove("input_underestimated_jitter_frames", labels);
231 global_metrics.remove("input_estimated_max_jitter_seconds", labels);
234 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames)
236 if (expected_timestamp > steady_clock::time_point::min()) {
237 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
238 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
239 history.push_back(orders.insert(jitter_seconds));
240 if (jitter_seconds > estimate_max_jitter()) {
241 ++metric_input_underestimated_jitter_frames;
244 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
246 if (history.size() > history_length) {
247 orders.erase(history.front());
250 assert(history.size() <= history_length);
252 expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
255 double JitterHistory::estimate_max_jitter() const
257 if (orders.empty()) {
260 size_t elem_idx = lrint((orders.size() - 1) * percentile);
261 if (percentile <= 0.5) {
262 return *next(orders.begin(), elem_idx) * multiplier;
264 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
268 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
270 global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
273 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
275 global_metrics.remove("input_queue_safe_length_frames", labels);
278 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
279 steady_clock::time_point expected_next_frame,
280 int64_t input_frame_duration,
281 int64_t master_frame_duration,
282 double max_input_card_jitter_seconds,
283 double max_master_card_jitter_seconds)
285 double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
286 double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
288 // Figure out when we can expect the next frame for this card, assuming
289 // worst-case jitter (ie., the frame is maximally late).
290 double seconds_until_next_frame = max(duration<double>(expected_next_frame - now).count() + max_input_card_jitter_seconds, 0.0);
292 // How many times are the master card expected to tick in that time?
293 // We assume the master clock has worst-case jitter but not any rate
294 // discrepancy, ie., it ticks as early as possible every time, but not
296 double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
298 // As a special case, if the master card ticks faster than the input card,
299 // we expect the queue to drain by itself even without dropping. But if
300 // the difference is small (e.g. 60 Hz master and 59.94 input), it would
301 // go slowly enough that the effect wouldn't really be appreciable.
302 // We account for this by looking at the situation five frames ahead,
303 // assuming everything else is the same.
304 double frames_allowed;
305 if (master_frame_duration < input_frame_duration) {
306 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
308 frames_allowed = frames_needed;
311 safe_queue_length = max<int>(floor(frames_allowed), 0);
312 metric_input_queue_safe_length_frames = safe_queue_length;
315 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
317 num_cards(num_cards),
318 mixer_surface(create_surface(format)),
319 h264_encoder_surface(create_surface(format)),
320 decklink_output_surface(create_surface(format)),
321 image_update_surface(create_surface(format))
323 memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
324 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
327 if (!epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") ||
328 !epoxy_has_gl_extension("GL_ARB_sampler_objects")) {
329 fprintf(stderr, "Nageru requires GL_EXT_texture_sRGB_decode and GL_ARB_sampler_objects to run.\n");
333 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
334 // will be halved when sampling them, and we need to compensate here.
335 movit_texel_subpixel_precision /= 2.0;
337 resource_pool.reset(new ResourcePool);
338 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
339 output_channel[i].parent = this;
340 output_channel[i].channel = i;
343 ImageFormat inout_format;
344 inout_format.color_space = COLORSPACE_sRGB;
345 inout_format.gamma_curve = GAMMA_sRGB;
347 // Matches the 4:2:0 format created by the main chain.
348 YCbCrFormat ycbcr_format;
349 ycbcr_format.chroma_subsampling_x = 2;
350 ycbcr_format.chroma_subsampling_y = 2;
351 if (global_flags.ycbcr_rec709_coefficients) {
352 ycbcr_format.luma_coefficients = YCBCR_REC_709;
354 ycbcr_format.luma_coefficients = YCBCR_REC_601;
356 ycbcr_format.full_range = false;
357 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
358 ycbcr_format.cb_x_position = 0.0f;
359 ycbcr_format.cr_x_position = 0.0f;
360 ycbcr_format.cb_y_position = 0.5f;
361 ycbcr_format.cr_y_position = 0.5f;
363 // Initialize the neutral colors to sane values.
364 for (unsigned i = 0; i < MAX_VIDEO_CARDS; ++i) {
365 last_received_neutral_color[i] = RGBTriplet(1.0f, 1.0f, 1.0f);
368 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
369 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
371 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
372 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
373 display_chain->add_input(display_input);
374 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
375 display_chain->set_dither_bits(0); // Don't bother.
376 display_chain->finalize();
378 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));
379 if (!global_flags.card_to_mjpeg_stream_export.empty()) {
380 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
383 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
384 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
386 // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
387 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
388 audio_mixer.reset(new AudioMixer(num_cards, video_inputs.size()));
390 httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
391 for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
393 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx + 2);
394 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx + 2)), HTTPD::ALLOW_ALL_ORIGINS);
397 // Start listening for clients only once VideoEncoder has written its header, if any.
398 httpd.start(global_flags.http_port);
400 // First try initializing the then PCI devices, then USB, then
401 // fill up with fake cards until we have the desired number of cards.
402 unsigned num_pci_devices = 0;
403 unsigned card_index = 0;
406 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
407 if (decklink_iterator != nullptr) {
408 for ( ; card_index < num_cards; ++card_index) {
410 if (decklink_iterator->Next(&decklink) != S_OK) {
414 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
415 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
416 if (!output->set_device(decklink)) {
420 configure_card(card_index, capture, CardType::LIVE_CARD, output);
423 decklink_iterator->Release();
424 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
426 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
430 unsigned num_usb_devices = BMUSBCapture::num_cards();
431 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
432 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
433 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
434 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
436 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
438 unsigned num_fake_cards = 0;
439 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
440 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
441 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
444 if (num_fake_cards > 0) {
445 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
448 // Initialize all video inputs the theme asked for. Note that these are
449 // all put _after_ the regular cards, which stop at <num_cards> - 1.
450 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
451 if (card_index >= MAX_VIDEO_CARDS) {
452 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
455 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
456 video_inputs[video_card_index]->set_card_index(card_index);
458 num_video_inputs = video_inputs.size();
461 // Same, for HTML inputs.
462 std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
463 for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
464 if (card_index >= MAX_VIDEO_CARDS) {
465 fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
468 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr);
469 html_inputs[html_card_index]->set_card_index(card_index);
471 num_html_inputs = html_inputs.size();
474 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
475 BMUSBCapture::start_bm_thread();
478 if (global_flags.srt_port >= 0) {
483 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
484 cards[card_index].queue_length_policy.reset(card_index);
487 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
489 if (global_flags.ten_bit_input) {
490 if (!v210Converter::has_hardware_support()) {
491 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
492 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
495 v210_converter.reset(new v210Converter());
497 // These are all the widths listed in the Blackmagic SDK documentation
498 // (section 2.7.3, “Display Modes”).
499 v210_converter->precompile_shader(720);
500 v210_converter->precompile_shader(1280);
501 v210_converter->precompile_shader(1920);
502 v210_converter->precompile_shader(2048);
503 v210_converter->precompile_shader(3840);
504 v210_converter->precompile_shader(4096);
506 if (global_flags.ten_bit_output) {
507 if (!v210Converter::has_hardware_support()) {
508 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
509 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
514 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
515 display_timecode_in_stream = global_flags.display_timecode_in_stream;
516 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
518 if (global_flags.enable_alsa_output) {
519 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
521 if (global_flags.output_card != -1) {
522 desired_output_card_index = global_flags.output_card;
523 set_output_card_internal(global_flags.output_card);
526 output_jitter_history.register_metrics({{ "card", "output" }});
528 ImageInput::start_update_thread(image_update_surface);
533 ImageInput::end_update_thread();
535 if (mjpeg_encoder != nullptr) {
536 mjpeg_encoder->stop();
539 BMUSBCapture::stop_bm_thread();
541 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
542 cards[card_index].capture->stop_dequeue_thread();
543 if (cards[card_index].output) {
544 cards[card_index].output->end_output();
545 cards[card_index].output.reset();
549 video_encoder.reset(nullptr);
552 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card)
554 printf("Configuring card %d...\n", card_index);
556 CaptureCard *card = &cards[card_index];
557 if (card->capture != nullptr) {
558 card->capture->stop_dequeue_thread();
560 card->capture.reset(capture);
561 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
562 if (card->is_fake_capture) {
563 card->fake_capture_counter = fake_capture_counter++;
565 card->is_cef_capture = (card_type == CardType::CEF_INPUT);
566 card->may_have_dropped_last_frame = false;
567 card->type = card_type;
568 if (card->output.get() != output) {
569 card->output.reset(output);
572 PixelFormat pixel_format;
573 if (card_type == CardType::FFMPEG_INPUT) {
574 pixel_format = capture->get_current_pixel_format();
575 } else if (card_type == CardType::CEF_INPUT) {
576 pixel_format = PixelFormat_8BitBGRA;
577 } else if (global_flags.ten_bit_input) {
578 pixel_format = PixelFormat_10BitYCbCr;
580 pixel_format = PixelFormat_8BitYCbCr;
583 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
584 if (card->frame_allocator == nullptr) {
585 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get())); // 8 MB.
587 // The format could have changed, but we cannot reset the allocator
588 // and create a new one from scratch, since there may be allocated
589 // frames from it that expect to call release_frame() on it.
590 // Instead, ask the allocator to create new frames for us and discard
591 // any old ones as they come back. This takes the mutex while
592 // allocating, but nothing should really be sending frames in there
593 // right now anyway (start_bm_capture() has not been called yet).
594 card->frame_allocator->reconfigure(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get());
596 card->capture->set_video_frame_allocator(card->frame_allocator.get());
597 if (card->surface == nullptr) {
598 card->surface = create_surface_with_same_format(mixer_surface);
600 while (!card->new_frames.empty()) card->new_frames.pop_front();
601 card->last_timecode = -1;
602 card->capture->set_pixel_format(pixel_format);
603 card->capture->configure_card();
605 // NOTE: start_bm_capture() happens in thread_func().
608 assert(card_type == CardType::FFMPEG_INPUT);
612 if (card_type == CardType::FFMPEG_INPUT && !is_srt_card) {
613 device = DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
615 device = DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
617 audio_mixer->reset_resampler(device);
618 audio_mixer->set_display_name(device, card->capture->get_description());
619 audio_mixer->trigger_state_changed_callback();
621 // Unregister old metrics, if any.
622 if (!card->labels.empty()) {
623 const vector<pair<string, string>> &labels = card->labels;
624 card->jitter_history.unregister_metrics(labels);
625 card->queue_length_policy.unregister_metrics(labels);
626 global_metrics.remove_if_exists("input_received_frames", labels);
627 global_metrics.remove_if_exists("input_dropped_frames_jitter", labels);
628 global_metrics.remove_if_exists("input_dropped_frames_error", labels);
629 global_metrics.remove_if_exists("input_dropped_frames_resets", labels);
630 global_metrics.remove_if_exists("input_queue_length_frames", labels);
631 global_metrics.remove_if_exists("input_queue_duped_frames", labels);
633 global_metrics.remove_if_exists("input_has_signal_bool", labels);
634 global_metrics.remove_if_exists("input_is_connected_bool", labels);
635 global_metrics.remove_if_exists("input_interlaced_bool", labels);
636 global_metrics.remove_if_exists("input_width_pixels", labels);
637 global_metrics.remove_if_exists("input_height_pixels", labels);
638 global_metrics.remove_if_exists("input_frame_rate_nom", labels);
639 global_metrics.remove_if_exists("input_frame_rate_den", labels);
640 global_metrics.remove_if_exists("input_sample_rate_hz", labels);
644 // Global measurements (counters).
645 global_metrics.remove_if_exists("srt_uptime_seconds", labels);
646 global_metrics.remove_if_exists("srt_send_duration_seconds", labels);
647 global_metrics.remove_if_exists("srt_sent_bytes", labels);
648 global_metrics.remove_if_exists("srt_received_bytes", labels);
650 vector<pair<string, string>> packet_labels = card->labels;
651 packet_labels.emplace_back("type", "normal");
652 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
653 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
655 packet_labels.back().second = "lost";
656 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
657 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
659 packet_labels.back().second = "retransmitted";
660 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
661 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
663 packet_labels.back().second = "ack";
664 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
665 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
667 packet_labels.back().second = "nak";
668 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
669 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
671 packet_labels.back().second = "dropped";
672 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
673 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
674 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
675 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
677 packet_labels.back().second = "undecryptable";
678 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
679 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
681 global_metrics.remove_if_exists("srt_filter_sent_extra_packets", labels);
682 global_metrics.remove_if_exists("srt_filter_received_extra_packets", labels);
683 global_metrics.remove_if_exists("srt_filter_received_rebuilt_packets", labels);
684 global_metrics.remove_if_exists("srt_filter_received_lost_packets", labels);
686 // Instant measurements (gauges).
687 global_metrics.remove_if_exists("srt_packet_sending_period_seconds", labels);
688 global_metrics.remove_if_exists("srt_flow_window_packets", labels);
689 global_metrics.remove_if_exists("srt_congestion_window_packets", labels);
690 global_metrics.remove_if_exists("srt_flight_size_packets", labels);
691 global_metrics.remove_if_exists("srt_rtt_seconds", labels);
692 global_metrics.remove_if_exists("srt_estimated_bandwidth_bits_per_second", labels);
693 global_metrics.remove_if_exists("srt_bandwidth_ceiling_bits_per_second", labels);
694 global_metrics.remove_if_exists("srt_send_buffer_available_bytes", labels);
695 global_metrics.remove_if_exists("srt_receive_buffer_available_bytes", labels);
696 global_metrics.remove_if_exists("srt_mss_bytes", labels);
698 global_metrics.remove_if_exists("srt_sender_unacked_packets", labels);
699 global_metrics.remove_if_exists("srt_sender_unacked_bytes", labels);
700 global_metrics.remove_if_exists("srt_sender_unacked_timespan_seconds", labels);
701 global_metrics.remove_if_exists("srt_sender_delivery_delay_seconds", labels);
703 global_metrics.remove_if_exists("srt_receiver_unacked_packets", labels);
704 global_metrics.remove_if_exists("srt_receiver_unacked_bytes", labels);
705 global_metrics.remove_if_exists("srt_receiver_unacked_timespan_seconds", labels);
706 global_metrics.remove_if_exists("srt_receiver_delivery_delay_seconds", labels);
710 vector<pair<string, string>> labels;
712 snprintf(card_name, sizeof(card_name), "%d", card_index);
713 labels.emplace_back("card", card_name);
716 case CardType::LIVE_CARD:
717 labels.emplace_back("cardtype", "live");
719 case CardType::FAKE_CAPTURE:
720 labels.emplace_back("cardtype", "fake");
722 case CardType::FFMPEG_INPUT:
724 labels.emplace_back("cardtype", "srt");
726 labels.emplace_back("cardtype", "ffmpeg");
729 case CardType::CEF_INPUT:
730 labels.emplace_back("cardtype", "cef");
735 card->jitter_history.register_metrics(labels);
736 card->queue_length_policy.register_metrics(labels);
737 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
738 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
739 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
740 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
741 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
742 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
744 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
745 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
746 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
747 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
748 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
749 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
750 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
751 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
754 // Global measurements (counters).
755 global_metrics.add("srt_uptime_seconds", labels, &card->metric_srt_uptime_seconds);
756 global_metrics.add("srt_send_duration_seconds", labels, &card->metric_srt_send_duration_seconds);
757 global_metrics.add("srt_sent_bytes", labels, &card->metric_srt_sent_bytes);
758 global_metrics.add("srt_received_bytes", labels, &card->metric_srt_received_bytes);
760 vector<pair<string, string>> packet_labels = labels;
761 packet_labels.emplace_back("type", "normal");
762 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_normal);
763 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_normal);
765 packet_labels.back().second = "lost";
766 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_lost);
767 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_lost);
769 packet_labels.back().second = "retransmitted";
770 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_retransmitted);
771 global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_retransmitted);
773 packet_labels.back().second = "ack";
774 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_ack);
775 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_ack);
777 packet_labels.back().second = "nak";
778 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_nak);
779 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_nak);
781 packet_labels.back().second = "dropped";
782 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_dropped);
783 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_dropped);
784 global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_dropped);
785 global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_dropped);
787 packet_labels.back().second = "undecryptable";
788 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_undecryptable);
789 global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_undecryptable);
791 global_metrics.add("srt_filter_sent_extra_packets", labels, &card->metric_srt_filter_sent_packets);
792 global_metrics.add("srt_filter_received_extra_packets", labels, &card->metric_srt_filter_received_extra_packets);
793 global_metrics.add("srt_filter_received_rebuilt_packets", labels, &card->metric_srt_filter_received_rebuilt_packets);
794 global_metrics.add("srt_filter_received_lost_packets", labels, &card->metric_srt_filter_received_lost_packets);
796 // Instant measurements (gauges).
797 global_metrics.add("srt_packet_sending_period_seconds", labels, &card->metric_srt_packet_sending_period_seconds, Metrics::TYPE_GAUGE);
798 global_metrics.add("srt_flow_window_packets", labels, &card->metric_srt_flow_window_packets, Metrics::TYPE_GAUGE);
799 global_metrics.add("srt_congestion_window_packets", labels, &card->metric_srt_congestion_window_packets, Metrics::TYPE_GAUGE);
800 global_metrics.add("srt_flight_size_packets", labels, &card->metric_srt_flight_size_packets, Metrics::TYPE_GAUGE);
801 global_metrics.add("srt_rtt_seconds", labels, &card->metric_srt_rtt_seconds, Metrics::TYPE_GAUGE);
802 global_metrics.add("srt_estimated_bandwidth_bits_per_second", labels, &card->metric_srt_estimated_bandwidth_bits_per_second, Metrics::TYPE_GAUGE);
803 global_metrics.add("srt_bandwidth_ceiling_bits_per_second", labels, &card->metric_srt_bandwidth_ceiling_bits_per_second, Metrics::TYPE_GAUGE);
804 global_metrics.add("srt_send_buffer_available_bytes", labels, &card->metric_srt_send_buffer_available_bytes, Metrics::TYPE_GAUGE);
805 global_metrics.add("srt_receive_buffer_available_bytes", labels, &card->metric_srt_receive_buffer_available_bytes, Metrics::TYPE_GAUGE);
806 global_metrics.add("srt_mss_bytes", labels, &card->metric_srt_mss_bytes, Metrics::TYPE_GAUGE);
808 global_metrics.add("srt_sender_unacked_packets", labels, &card->metric_srt_sender_unacked_packets, Metrics::TYPE_GAUGE);
809 global_metrics.add("srt_sender_unacked_bytes", labels, &card->metric_srt_sender_unacked_bytes, Metrics::TYPE_GAUGE);
810 global_metrics.add("srt_sender_unacked_timespan_seconds", labels, &card->metric_srt_sender_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
811 global_metrics.add("srt_sender_delivery_delay_seconds", labels, &card->metric_srt_sender_delivery_delay_seconds, Metrics::TYPE_GAUGE);
813 global_metrics.add("srt_receiver_unacked_packets", labels, &card->metric_srt_receiver_unacked_packets, Metrics::TYPE_GAUGE);
814 global_metrics.add("srt_receiver_unacked_bytes", labels, &card->metric_srt_receiver_unacked_bytes, Metrics::TYPE_GAUGE);
815 global_metrics.add("srt_receiver_unacked_timespan_seconds", labels, &card->metric_srt_receiver_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
816 global_metrics.add("srt_receiver_delivery_delay_seconds", labels, &card->metric_srt_receiver_delivery_delay_seconds, Metrics::TYPE_GAUGE);
819 card->labels = labels;
822 void Mixer::set_output_card_internal(int card_index)
824 // We don't really need to take card_mutex, since we're in the mixer
825 // thread and don't mess with any queues (which is the only thing that happens
826 // from other threads), but it's probably the safest in the long run.
827 unique_lock<mutex> lock(card_mutex);
828 if (output_card_index != -1) {
829 // Switch the old card from output to input.
830 CaptureCard *old_card = &cards[output_card_index];
831 old_card->output->end_output();
833 // Stop the fake card that we put into place.
834 // This needs to _not_ happen under the mutex, to avoid deadlock
835 // (delivering the last frame needs to take the mutex).
836 CaptureInterface *fake_capture = old_card->capture.get();
838 fake_capture->stop_dequeue_thread();
840 old_card->capture = move(old_card->parked_capture); // TODO: reset the metrics
841 old_card->is_fake_capture = false;
842 old_card->capture->start_bm_capture();
844 if (card_index != -1) {
845 CaptureCard *card = &cards[card_index];
846 CaptureInterface *capture = card->capture.get();
847 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
848 // several seconds to complete (blocking on DisableVideoInput);
849 // see if we can maybe do it asynchronously.
851 capture->stop_dequeue_thread();
853 card->parked_capture = move(card->capture);
854 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
855 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
856 card->queue_length_policy.reset(card_index);
857 card->capture->start_bm_capture();
858 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
859 card->output->start_output(desired_output_video_mode, pts_int);
861 output_card_index = card_index;
862 output_jitter_history.clear();
867 int unwrap_timecode(uint16_t current_wrapped, int last)
869 uint16_t last_wrapped = last & 0xffff;
870 if (current_wrapped > last_wrapped) {
871 return (last & ~0xffff) | current_wrapped;
873 return 0x10000 + ((last & ~0xffff) | current_wrapped);
877 DeviceSpec card_index_to_device(unsigned card_index, unsigned num_cards)
879 if (card_index >= num_cards) {
880 return DeviceSpec{InputSourceType::FFMPEG_VIDEO_INPUT, card_index - num_cards};
882 return DeviceSpec{InputSourceType::CAPTURE_CARD, card_index};
888 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
889 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
890 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
892 DeviceSpec device = card_index_to_device(card_index, num_cards);
893 CaptureCard *card = &cards[card_index];
895 ++card->metric_input_received_frames;
896 card->metric_input_has_signal_bool = video_format.has_signal;
897 card->metric_input_is_connected_bool = video_format.is_connected;
898 card->metric_input_interlaced_bool = video_format.interlaced;
899 card->metric_input_width_pixels = video_format.width;
900 card->metric_input_height_pixels = video_format.height;
901 card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
902 card->metric_input_frame_rate_den = video_format.frame_rate_den;
903 card->metric_input_sample_rate_hz = audio_format.sample_rate;
905 if (is_mode_scanning[card_index]) {
906 if (video_format.has_signal) {
907 // Found a stable signal, so stop scanning.
908 is_mode_scanning[card_index] = false;
910 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
911 steady_clock::time_point now = steady_clock::now();
912 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
913 if (sec_since_last_switch > switch_time_s) {
914 // It isn't this mode; try the next one.
915 mode_scanlist_index[card_index]++;
916 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
917 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
918 last_mode_scan_change[card_index] = now;
923 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
924 assert(frame_length > 0);
926 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;
927 if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
928 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",
929 spec_to_string(device).c_str(), int(audio_frame.len), int(audio_offset),
930 timecode, int(video_frame.len), int(video_offset), video_format.id);
931 if (video_frame.owner) {
932 video_frame.owner->release_frame(video_frame);
934 if (audio_frame.owner) {
935 audio_frame.owner->release_frame(audio_frame);
940 int dropped_frames = 0;
941 if (card->last_timecode != -1) {
942 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
945 // Number of samples per frame if we need to insert silence.
946 // (Could be nonintegral, but resampling will save us then.)
947 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
949 if (dropped_frames > MAX_FPS * 2) {
950 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
951 spec_to_string(device).c_str(), card->last_timecode, timecode);
952 audio_mixer->reset_resampler(device);
954 ++card->metric_input_resets;
955 } else if (dropped_frames > 0) {
956 // Insert silence as needed.
957 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
958 spec_to_string(device).c_str(), dropped_frames, timecode);
959 card->metric_input_dropped_frames_error += dropped_frames;
963 success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
967 if (num_samples > 0) {
968 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
970 // Audio for the MJPEG stream. We don't resample; audio that's not in 48 kHz
971 // just gets dropped for now.
973 // Only bother doing MJPEG encoding if there are any connected clients
974 // that want the stream.
975 if (httpd.get_num_connected_multicam_clients() > 0 ||
976 httpd.get_num_connected_siphon_clients(card_index) > 0) {
977 vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
978 lock_guard<mutex> lock(card_mutex);
979 if (card->new_raw_audio.empty()) {
980 card->new_raw_audio = move(converted_samples);
982 // For raw audio, we don't really synchronize audio and video;
983 // we just put the audio in frame by frame, and if a video frame is
984 // dropped, we still keep the audio, which means it will be added
985 // to the beginning of the next frame. It would probably be better
986 // to move the audio pts earlier to show this, but most players can
987 // live with some jitter, and in a lot of ways, it's much nicer for
988 // Futatabi to have all audio locked to a video frame.
989 card->new_raw_audio.insert(card->new_raw_audio.end(), converted_samples.begin(), converted_samples.end());
991 // Truncate to one second, just to be sure we don't have infinite buildup in case of weirdness.
992 if (card->new_raw_audio.size() > OUTPUT_FREQUENCY * 2) {
993 size_t excess_samples = card->new_raw_audio.size() - OUTPUT_FREQUENCY * 2;
994 card->new_raw_audio.erase(card->new_raw_audio.begin(), card->new_raw_audio.begin() + excess_samples);
1000 // Done with the audio, so release it.
1001 if (audio_frame.owner) {
1002 audio_frame.owner->release_frame(audio_frame);
1005 card->last_timecode = timecode;
1007 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
1008 if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
1009 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1010 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
1011 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
1014 if (card->type == CardType::FFMPEG_INPUT) {
1015 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
1016 if (srt_sock != -1) {
1017 update_srt_stats(srt_sock, card);
1022 size_t y_offset, cbcr_offset;
1023 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
1024 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1025 // The calculation above is wrong for planar Y'CbCr, so just override it.
1026 assert(card->type == CardType::FFMPEG_INPUT);
1027 assert(video_offset == 0);
1028 expected_length = video_frame.len;
1030 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
1032 cbcr_offset = video_format.width * video_format.height;
1034 // All the other Y'CbCr formats are 4:2:2.
1035 y_offset = video_frame.size / 2 + video_offset / 2;
1036 cbcr_offset = video_offset / 2;
1038 if (video_frame.len - video_offset == 0 ||
1039 video_frame.len - video_offset != expected_length) {
1040 if (video_frame.len != 0) {
1041 printf("%s: Dropping video frame with wrong length (%zu; expected %zu)\n",
1042 spec_to_string(device).c_str(), video_frame.len - video_offset, expected_length);
1044 if (video_frame.owner) {
1045 video_frame.owner->release_frame(video_frame);
1048 // Still send on the information that we _had_ a frame, even though it's corrupted,
1049 // so that pts can go up accordingly.
1051 lock_guard<mutex> lock(card_mutex);
1052 CaptureCard::NewFrame new_frame;
1053 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
1054 new_frame.length = frame_length;
1055 new_frame.interlaced = false;
1056 new_frame.dropped_frames = dropped_frames;
1057 new_frame.received_timestamp = video_frame.received_timestamp;
1058 card->new_frames.push_back(move(new_frame));
1059 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1061 card->new_frames_changed.notify_all();
1065 unsigned num_fields = video_format.interlaced ? 2 : 1;
1066 steady_clock::time_point frame_upload_start;
1067 if (video_format.interlaced) {
1068 // Send the two fields along as separate frames; the other side will need to add
1069 // a deinterlacer to actually get this right.
1070 assert(video_format.height % 2 == 0);
1071 video_format.height /= 2;
1072 assert(frame_length % 2 == 0);
1075 frame_upload_start = steady_clock::now();
1077 assert(userdata != nullptr);
1078 userdata->last_interlaced = video_format.interlaced;
1079 userdata->last_has_signal = video_format.has_signal;
1080 userdata->last_is_connected = video_format.is_connected;
1081 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
1082 userdata->last_frame_rate_den = video_format.frame_rate_den;
1083 RefCountedFrame frame(video_frame);
1085 // Send the frames on to the main thread, which will upload and process htem.
1086 // It is entirely possible to upload them in the same thread (and it might even be
1087 // faster, depending on the GPU and driver), but it appears to be trickling
1088 // driver bugs very easily.
1090 // Note that this means we must hold on to the actual frame data in <userdata>
1091 // until the upload is done, but we hold on to <frame> much longer than that
1092 // (in fact, all the way until we no longer use the texture in rendering).
1093 for (unsigned field = 0; field < num_fields; ++field) {
1095 // Don't upload the second field as fast as we can; wait until
1096 // the field time has approximately passed. (Otherwise, we could
1097 // get timing jitter against the other sources, and possibly also
1098 // against the video display, although the latter is not as critical.)
1099 // This requires our system clock to be reasonably close to the
1100 // video clock, but that's not an unreasonable assumption.
1101 steady_clock::time_point second_field_start = frame_upload_start +
1102 nanoseconds(frame_length * 1000000000 / TIMEBASE);
1103 this_thread::sleep_until(second_field_start);
1107 lock_guard<mutex> lock(card_mutex);
1108 CaptureCard::NewFrame new_frame;
1109 new_frame.frame = frame;
1110 new_frame.length = frame_length;
1111 new_frame.field = field;
1112 new_frame.interlaced = video_format.interlaced;
1113 new_frame.dropped_frames = dropped_frames;
1114 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
1115 new_frame.video_format = video_format;
1116 new_frame.video_offset = video_offset;
1117 new_frame.y_offset = y_offset;
1118 new_frame.cbcr_offset = cbcr_offset;
1119 new_frame.texture_uploaded = false;
1120 if (card->type == CardType::FFMPEG_INPUT) {
1121 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1122 new_frame.neutral_color = ffmpeg_capture->get_last_neutral_color();
1124 card->new_frames.push_back(move(new_frame));
1125 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1126 card->may_have_dropped_last_frame = false;
1128 card->new_frames_changed.notify_all();
1132 void Mixer::upload_texture_for_frame(
1133 int field, bmusb::VideoFormat video_format,
1134 size_t y_offset, size_t cbcr_offset, size_t video_offset, PBOFrameAllocator::Userdata *userdata)
1136 size_t cbcr_width, cbcr_height;
1137 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1138 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
1139 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
1141 // All the other Y'CbCr formats are 4:2:2.
1142 cbcr_width = video_format.width / 2;
1143 cbcr_height = video_format.height;
1146 bool interlaced_stride = video_format.interlaced && (video_format.second_field_start == 1);
1147 if (video_format.interlaced) {
1151 unsigned field_start_line;
1153 field_start_line = video_format.second_field_start;
1155 field_start_line = video_format.extra_lines_top;
1158 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
1159 size_t v210_width = video_format.stride / sizeof(uint32_t);
1160 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
1162 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
1165 switch (userdata->pixel_format) {
1166 case PixelFormat_10BitYCbCr: {
1167 size_t field_start = video_offset + video_format.stride * field_start_line;
1168 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);
1169 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
1172 case PixelFormat_8BitYCbCr: {
1173 size_t field_y_start = y_offset + video_format.width * field_start_line;
1174 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
1176 // Make up our own strides, since we are interleaving.
1177 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);
1178 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);
1181 case PixelFormat_8BitYCbCrPlanar: {
1182 assert(field_start_line == 0); // We don't really support interlaced here.
1183 size_t field_y_start = y_offset;
1184 size_t field_cb_start = cbcr_offset;
1185 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
1187 // Make up our own strides, since we are interleaving.
1188 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);
1189 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
1190 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
1193 case PixelFormat_8BitBGRA: {
1194 size_t field_start = video_offset + video_format.stride * field_start_line;
1195 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);
1196 // These could be asked to deliver mipmaps at any time.
1197 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
1199 glGenerateMipmap(GL_TEXTURE_2D);
1201 glBindTexture(GL_TEXTURE_2D, 0);
1209 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
1213 void Mixer::bm_hotplug_add(libusb_device *dev)
1215 lock_guard<mutex> lock(hotplug_mutex);
1216 hotplugged_cards.push_back(dev);
1219 void Mixer::bm_hotplug_remove(unsigned card_index)
1221 cards[card_index].new_frames_changed.notify_all();
1224 void Mixer::thread_func()
1226 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
1228 eglBindAPI(EGL_OPENGL_API);
1229 QOpenGLContext *context = create_context(mixer_surface);
1230 if (!make_current(context, mixer_surface)) {
1235 // Start the actual capture. (We don't want to do it before we're actually ready
1236 // to process output frames.)
1237 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1238 if (int(card_index) != output_card_index) {
1239 cards[card_index].capture->start_bm_capture();
1243 BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1244 int stats_dropped_frames = 0;
1246 while (!should_quit) {
1247 if (desired_output_card_index != output_card_index) {
1248 set_output_card_internal(desired_output_card_index);
1250 if (output_card_index != -1 &&
1251 desired_output_video_mode != output_video_mode) {
1252 DeckLinkOutput *output = cards[output_card_index].output.get();
1253 output->end_output();
1254 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1255 output->start_output(desired_output_video_mode, pts_int);
1258 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1259 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1261 bool master_card_is_output;
1262 unsigned master_card_index;
1263 if (output_card_index != -1) {
1264 master_card_is_output = true;
1265 master_card_index = output_card_index;
1267 master_card_is_output = false;
1268 master_card_index = theme->map_signal_to_card(master_clock_channel);
1269 assert(master_card_index < num_cards + num_video_inputs);
1272 handle_hotplugged_cards();
1274 vector<int32_t> raw_audio[MAX_VIDEO_CARDS]; // For MJPEG encoding.
1275 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame, raw_audio);
1276 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);
1277 stats_dropped_frames += output_frame_info.dropped_frames;
1279 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1280 DeviceSpec device = card_index_to_device(card_index, num_cards);
1281 if (card_index == master_card_index || !has_new_frame[card_index]) {
1284 if (new_frames[card_index].frame->len == 0) {
1285 ++new_frames[card_index].dropped_frames;
1287 if (new_frames[card_index].dropped_frames > 0) {
1288 printf("%s dropped %d frames before this\n",
1289 spec_to_string(device).c_str(), int(new_frames[card_index].dropped_frames));
1293 // If the first card is reporting a corrupted or otherwise dropped frame,
1294 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1295 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
1296 ++stats_dropped_frames;
1297 pts_int += new_frames[master_card_index].length;
1301 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1302 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1305 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1306 assert(new_frame->frame != nullptr);
1307 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1310 // The new texture might need uploading before use.
1311 if (!new_frame->texture_uploaded) {
1312 upload_texture_for_frame(new_frame->field, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset,
1313 new_frame->video_offset, (PBOFrameAllocator::Userdata *)new_frame->frame->userdata);
1314 new_frame->texture_uploaded = true;
1317 // Only set the white balance if it actually changed. This means that the user
1318 // is free to override the white balance in a video with no white balance information
1319 // actually set (ie. r=g=b=1 all the time), or one where the white point is wrong,
1320 // but frame-to-frame decisions will be heeded. We do this pretty much as late
1321 // as possible (ie., after picking out the frame from the buffer), so that we are sure
1322 // that the change takes effect on exactly the right frame.
1323 if (fabs(new_frame->neutral_color.r - last_received_neutral_color[card_index].r) > 1e-3 ||
1324 fabs(new_frame->neutral_color.g - last_received_neutral_color[card_index].g) > 1e-3 ||
1325 fabs(new_frame->neutral_color.b - last_received_neutral_color[card_index].b) > 1e-3) {
1326 theme->set_wb_for_card(card_index, new_frame->neutral_color.r, new_frame->neutral_color.g, new_frame->neutral_color.b);
1327 last_received_neutral_color[card_index] = new_frame->neutral_color;
1330 if (new_frame->frame->data_copy != nullptr && mjpeg_encoder->should_encode_mjpeg_for_card(card_index)) {
1331 RGBTriplet neutral_color = theme->get_white_balance_for_card(card_index);
1332 mjpeg_encoder->upload_frame(pts_int, card_index, new_frame->frame, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset, move(raw_audio[card_index]), neutral_color);
1337 int64_t frame_duration = output_frame_info.frame_duration;
1338 render_one_frame(frame_duration);
1340 lock_guard<mutex> lock(frame_num_mutex);
1343 frame_num_updated.notify_all();
1344 pts_int += frame_duration;
1346 basic_stats.update(frame_num, stats_dropped_frames);
1347 // if (frame_num % 100 == 0) chain->print_phase_timing();
1349 if (should_cut.exchange(false)) { // Test and clear.
1350 video_encoder->do_cut(frame_num);
1354 // Reset every 100 frames, so that local variations in frame times
1355 // (especially for the first few frames, when the shaders are
1356 // compiled etc.) don't make it hard to measure for the entire
1357 // remaining duration of the program.
1358 if (frame == 10000) {
1366 resource_pool->clean_context();
1369 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1371 if (output_card_index != -1) {
1372 // The output card (ie., cards[output_card_index].output) is the master clock,
1373 // so no input card (ie., cards[card_index].capture) is.
1376 return (card_index == master_card_index);
1379 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1381 // Count the number of frames in the queue, including any frames
1382 // we dropped. It's hard to know exactly how we should deal with
1383 // dropped (corrupted) input frames; they don't help our goal of
1384 // avoiding starvation, but they still add to the problem of latency.
1385 // Since dropped frames is going to mean a bump in the signal anyway,
1386 // we err on the side of having more stable latency instead.
1387 unsigned queue_length = 0;
1388 for (const CaptureCard::NewFrame &frame : card->new_frames) {
1389 queue_length += frame.dropped_frames + 1;
1392 // If needed, drop frames until the queue is below the safe limit.
1393 // We prefer to drop from the head, because all else being equal,
1394 // we'd like more recent frames (less latency).
1395 unsigned dropped_frames = 0;
1396 while (queue_length > safe_queue_length) {
1397 assert(!card->new_frames.empty());
1398 assert(queue_length > card->new_frames.front().dropped_frames);
1399 queue_length -= card->new_frames.front().dropped_frames;
1401 if (queue_length <= safe_queue_length) {
1402 // No need to drop anything.
1406 card->new_frames.pop_front();
1407 card->new_frames_changed.notify_all();
1411 if (queue_length == 0 && card->is_cef_capture) {
1412 card->may_have_dropped_last_frame = true;
1416 card->metric_input_dropped_frames_jitter += dropped_frames;
1417 card->metric_input_queue_length_frames = queue_length;
1420 if (dropped_frames > 0) {
1421 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1422 card_index, dropped_frames);
1427 pair<string, string> Mixer::get_channels_json()
1430 for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
1431 Channel *channel = ret.add_channel();
1432 channel->set_index(channel_idx + 2);
1433 channel->set_name(theme->get_channel_name(channel_idx + 2));
1434 channel->set_color(theme->get_channel_color(channel_idx + 2));
1437 google::protobuf::util::MessageToJsonString(ret, &contents); // Ignore any errors.
1438 return make_pair(contents, "text/json");
1441 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1443 return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1446 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], vector<int32_t> raw_audio[MAX_VIDEO_CARDS])
1448 OutputFrameInfo output_frame_info;
1450 unique_lock<mutex> lock(card_mutex, defer_lock);
1451 if (master_card_is_output) {
1452 // Clocked to the output, so wait for it to be ready for the next frame.
1453 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);
1456 // Wait for the master card to have a new frame.
1457 // TODO: Add a timeout.
1458 output_frame_info.is_preroll = false;
1460 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(); });
1463 if (master_card_is_output) {
1464 handle_hotplugged_cards();
1465 } else if (cards[master_card_index].new_frames.empty()) {
1466 // We were woken up, but not due to a new frame. Deal with it
1467 // and then restart.
1468 assert(cards[master_card_index].capture->get_disconnected());
1469 handle_hotplugged_cards();
1474 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1475 CaptureCard *card = &cards[card_index];
1476 if (card->new_frames.empty()) { // Starvation.
1477 ++card->metric_input_duped_frames;
1479 if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1480 // Unlike other sources, CEF is not guaranteed to send us a steady
1481 // stream of frames, so we'll have to ask it to repaint the frame
1482 // we dropped. (may_have_dropped_last_frame is set whenever we
1483 // trim the queue completely away, and cleared when we actually
1484 // get a new frame.)
1485 ((CEFCapture *)card->capture.get())->request_new_frame(/*ignore_if_locked=*/true);
1489 new_frames[card_index] = move(card->new_frames.front());
1490 has_new_frame[card_index] = true;
1491 card->new_frames.pop_front();
1492 card->new_frames_changed.notify_all();
1495 raw_audio[card_index] = move(card->new_raw_audio);
1498 if (!master_card_is_output) {
1499 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1500 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1501 output_frame_info.frame_duration = new_frames[master_card_index].length;
1504 if (!output_frame_info.is_preroll) {
1505 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1508 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs + num_html_inputs; ++card_index) {
1509 CaptureCard *card = &cards[card_index];
1510 if (has_new_frame[card_index] &&
1511 !input_card_is_master_clock(card_index, master_card_index) &&
1512 !output_frame_info.is_preroll) {
1513 card->queue_length_policy.update_policy(
1514 output_frame_info.frame_timestamp,
1515 card->jitter_history.get_expected_next_frame(),
1516 new_frames[master_card_index].length,
1517 output_frame_info.frame_duration,
1518 card->jitter_history.estimate_max_jitter(),
1519 output_jitter_history.estimate_max_jitter());
1520 trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1521 card->queue_length_policy.get_safe_queue_length()));
1525 // This might get off by a fractional sample when changing master card
1526 // between ones with different frame rates, but that's fine.
1527 int64_t num_samples_times_timebase = int64_t(OUTPUT_FREQUENCY) * output_frame_info.frame_duration + fractional_samples;
1528 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1529 fractional_samples = num_samples_times_timebase % TIMEBASE;
1530 assert(output_frame_info.num_samples >= 0);
1532 return output_frame_info;
1535 void Mixer::handle_hotplugged_cards()
1537 // Check for cards that have been disconnected since last frame.
1538 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1539 CaptureCard *card = &cards[card_index];
1540 if (card->capture->get_disconnected()) {
1541 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1542 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1543 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1544 card->queue_length_policy.reset(card_index);
1545 card->capture->start_bm_capture();
1549 // Check for cards that have been connected since last frame.
1550 vector<libusb_device *> hotplugged_cards_copy;
1552 vector<int> hotplugged_srt_cards_copy;
1555 lock_guard<mutex> lock(hotplug_mutex);
1556 swap(hotplugged_cards, hotplugged_cards_copy);
1558 swap(hotplugged_srt_cards, hotplugged_srt_cards_copy);
1561 for (libusb_device *new_dev : hotplugged_cards_copy) {
1562 // Look for a fake capture card where we can stick this in.
1563 int free_card_index = -1;
1564 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1565 if (cards[card_index].is_fake_capture) {
1566 free_card_index = card_index;
1571 if (free_card_index == -1) {
1572 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1573 libusb_unref_device(new_dev);
1575 // BMUSBCapture takes ownership.
1576 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1577 CaptureCard *card = &cards[free_card_index];
1578 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1579 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1580 card->queue_length_policy.reset(free_card_index);
1581 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1582 capture->start_bm_capture();
1587 // Same, for SRT inputs.
1588 // TODO: On disconnect and reconnect, we might want to use the stream ID
1589 for (SRTSOCKET sock : hotplugged_srt_cards_copy) {
1591 int namelen = sizeof(name);
1592 srt_getsockopt(sock, /*ignored=*/0, SRTO_STREAMID, name, &namelen);
1593 string stream_id(name, namelen);
1595 // Look for a fake capture card where we can stick this in.
1596 // Prioritize ones that previously held SRT streams with the
1597 // same stream ID, if any exist -- and it multiple exist,
1598 // take the one that disconnected the last.
1599 int first_free_card_index = -1, last_matching_free_card_index = -1;
1600 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1601 CaptureCard *card = &cards[card_index];
1602 if (!card->is_fake_capture) {
1605 if (first_free_card_index == -1) {
1606 first_free_card_index = card_index;
1608 if (card->last_srt_stream_id == stream_id &&
1609 (last_matching_free_card_index == -1 ||
1610 card->fake_capture_counter >
1611 cards[last_matching_free_card_index].fake_capture_counter)) {
1612 last_matching_free_card_index = card_index;
1616 const int free_card_index = (last_matching_free_card_index != -1)
1617 ? last_matching_free_card_index : first_free_card_index;
1618 if (free_card_index == -1) {
1619 if (stream_id.empty()) {
1620 stream_id = "no name";
1622 fprintf(stderr, "New SRT stream connected (%s), but no free slots -- ignoring.\n", stream_id.c_str());
1625 // FFmpegCapture takes ownership.
1626 if (stream_id.empty()) {
1627 fprintf(stderr, "New unnamed SRT stream connected, choosing slot %d.\n", free_card_index);
1629 fprintf(stderr, "New SRT stream connected (%s), choosing slot %d.\n", stream_id.c_str(), free_card_index);
1631 CaptureCard *card = &cards[free_card_index];
1632 FFmpegCapture *capture = new FFmpegCapture(sock, stream_id);
1633 capture->set_card_index(free_card_index);
1634 configure_card(free_card_index, capture, CardType::FFMPEG_INPUT, /*output=*/nullptr, /*override_card_as_live=*/true);
1635 update_srt_stats(sock, card); // Initial zero stats.
1636 card->last_srt_stream_id = stream_id;
1637 card->queue_length_policy.reset(free_card_index);
1638 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1639 capture->start_bm_capture();
1646 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)
1648 // Resample the audio as needed, including from previously dropped frames.
1649 assert(num_cards > 0);
1650 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1651 const bool dropped_frame = (frame_num != dropped_frames);
1653 // Signal to the audio thread to process this frame.
1654 // Note that if the frame is a dropped frame, we signal that
1655 // we don't want to use this frame as base for adjusting
1656 // the resampler rate. The reason for this is that the timing
1657 // of these frames is often way too late; they typically don't
1658 // “arrive” before we synthesize them. Thus, we could end up
1659 // in a situation where we have inserted e.g. five audio frames
1660 // into the queue before we then start pulling five of them
1661 // back out. This makes ResamplingQueue overestimate the delay,
1662 // causing undue resampler changes. (We _do_ use the last,
1663 // non-dropped frame; perhaps we should just discard that as well,
1664 // since dropped frames are expected to be rare, and it might be
1665 // better to just wait until we have a slightly more normal situation).
1666 lock_guard<mutex> lock(audio_mutex);
1667 bool adjust_rate = !dropped_frame && !is_preroll;
1668 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1669 audio_task_queue_changed.notify_one();
1671 if (dropped_frame) {
1672 // For dropped frames, increase the pts. Note that if the format changed
1673 // in the meantime, we have no way of detecting that; we just have to
1674 // assume the frame length is always the same.
1675 pts_int += length_per_frame;
1680 void Mixer::render_one_frame(int64_t duration)
1682 // Determine the time code for this frame before we start rendering.
1683 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1684 if (display_timecode_on_stdout) {
1685 printf("Timecode: '%s'\n", timecode_text.c_str());
1688 // Update Y'CbCr settings for all cards.
1690 lock_guard<mutex> lock(card_mutex);
1691 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1692 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1693 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1694 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1695 input_state.full_range[card_index] = interpretation->full_range;
1699 // Get the main chain from the theme, and set its state immediately.
1700 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1701 EffectChain *chain = theme_main_chain.chain;
1702 theme_main_chain.setup_chain();
1703 //theme_main_chain.chain->enable_phase_timing(true);
1705 // If HDMI/SDI output is active and the user has requested auto mode,
1706 // its mode overrides the existing Y'CbCr setting for the chain.
1707 YCbCrLumaCoefficients ycbcr_output_coefficients;
1708 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1709 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1711 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1714 // TODO: Reduce the duplication against theme.cpp.
1715 YCbCrFormat output_ycbcr_format;
1716 output_ycbcr_format.chroma_subsampling_x = 1;
1717 output_ycbcr_format.chroma_subsampling_y = 1;
1718 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1719 output_ycbcr_format.full_range = false;
1720 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1721 chain->change_ycbcr_output_format(output_ycbcr_format);
1723 // Render main chain. If we're using zerocopy Quick Sync encoding
1724 // (the default case), we take an extra copy of the created outputs,
1725 // so that we can display it back to the screen later (it's less memory
1726 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1727 // Ideally, we'd like to avoid taking copies and just use the main textures
1728 // for display as well, but they're just views into VA-API memory and must be
1729 // unmapped during encoding, so we can't use them for display, unfortunately.
1730 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1731 GLuint y_copy_tex, cbcr_copy_tex = 0;
1732 GLuint y_display_tex, cbcr_display_tex;
1733 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1734 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1735 const bool is_zerocopy = video_encoder->is_zerocopy();
1737 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1738 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1739 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1741 y_display_tex = y_copy_tex;
1742 cbcr_display_tex = cbcr_copy_tex;
1744 // y_tex and cbcr_tex will be given by VideoEncoder.
1746 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1747 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1748 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1750 y_display_tex = y_tex;
1751 cbcr_display_tex = cbcr_tex;
1754 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1755 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1760 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1762 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1765 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1767 if (display_timecode_in_stream) {
1768 // Render the timecode on top.
1769 timecode_renderer->render_timecode(fbo, timecode_text);
1772 resource_pool->release_fbo(fbo);
1775 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1777 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1779 if (output_card_index != -1) {
1780 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1782 resource_pool->release_2d_texture(cbcr_full_tex);
1784 // Set the right state for the Y' and CbCr textures we use for display.
1785 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1786 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1787 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1788 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1789 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1791 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1792 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1793 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1794 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1796 RefCountedGLsync fence = video_encoder->end_frame();
1798 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1799 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1800 DisplayFrame live_frame;
1801 live_frame.chain = display_chain.get();
1802 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1803 display_input->set_texture_num(0, y_display_tex);
1804 display_input->set_texture_num(1, cbcr_display_tex);
1806 live_frame.ready_fence = fence;
1807 live_frame.input_frames = {};
1808 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1809 output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1811 // Set up preview and any additional channels.
1812 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1813 DisplayFrame display_frame;
1814 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1815 display_frame.chain = move(chain.chain);
1816 display_frame.setup_chain = move(chain.setup_chain);
1817 display_frame.ready_fence = fence;
1818 display_frame.input_frames = move(chain.input_frames);
1819 display_frame.temp_textures = {};
1820 output_channel[i].output_frame(move(display_frame));
1824 void Mixer::audio_thread_func()
1826 pthread_setname_np(pthread_self(), "Mixer_Audio");
1828 while (!should_quit) {
1832 unique_lock<mutex> lock(audio_mutex);
1833 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1837 task = audio_task_queue.front();
1838 audio_task_queue.pop();
1841 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1842 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1843 vector<float> samples_out = audio_mixer->get_output(
1844 task.frame_timestamp,
1846 rate_adjustment_policy);
1848 // Send the samples to the sound card, then add them to the output.
1850 alsa->write(samples_out);
1852 if (output_card_index != -1) {
1853 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1854 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1856 video_encoder->add_audio(task.pts_int, move(samples_out));
1860 void Mixer::release_display_frame(DisplayFrame *frame)
1862 for (GLuint texnum : frame->temp_textures) {
1863 resource_pool->release_2d_texture(texnum);
1865 frame->temp_textures.clear();
1866 frame->ready_fence.reset();
1867 frame->input_frames.clear();
1872 mixer_thread = thread(&Mixer::thread_func, this);
1873 audio_thread = thread(&Mixer::audio_thread_func, this);
1879 audio_task_queue_changed.notify_one();
1880 mixer_thread.join();
1881 audio_thread.join();
1883 if (global_flags.srt_port >= 0) {
1884 // There's seemingly no other reasonable way to wake up the thread
1885 // (libsrt's epoll equivalent is busy-waiting).
1886 int sock = srt_socket(AF_INET6, 0, 0);
1889 memset(&addr, 0, sizeof(addr));
1890 addr.sin6_family = AF_INET6;
1891 addr.sin6_addr = IN6ADDR_LOOPBACK_INIT;
1892 addr.sin6_port = htons(global_flags.srt_port);
1893 srt_connect(sock, (sockaddr *)&addr, sizeof(addr));
1901 void Mixer::transition_clicked(int transition_num)
1903 theme->transition_clicked(transition_num, pts());
1906 void Mixer::channel_clicked(int preview_num)
1908 theme->channel_clicked(preview_num);
1911 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1913 lock_guard<mutex> lock(card_mutex);
1914 return ycbcr_interpretation[card_index];
1917 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1919 lock_guard<mutex> lock(card_mutex);
1920 ycbcr_interpretation[card_index] = interpretation;
1923 void Mixer::start_mode_scanning(unsigned card_index)
1925 assert(card_index < num_cards);
1926 if (is_mode_scanning[card_index]) {
1929 is_mode_scanning[card_index] = true;
1930 mode_scanlist[card_index].clear();
1931 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1932 mode_scanlist[card_index].push_back(mode.first);
1934 assert(!mode_scanlist[card_index].empty());
1935 mode_scanlist_index[card_index] = 0;
1936 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1937 last_mode_scan_change[card_index] = steady_clock::now();
1940 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1942 assert(desired_output_card_index != -1);
1943 lock_guard<mutex> lock(card_mutex);
1944 return cards[desired_output_card_index].output->get_available_video_modes();
1947 string Mixer::get_ffmpeg_filename(unsigned card_index) const
1949 assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1950 return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
1953 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
1954 assert(card_index >= num_cards && card_index < num_cards + num_video_inputs);
1955 ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
1958 void Mixer::wait_for_next_frame()
1960 unique_lock<mutex> lock(frame_num_mutex);
1961 unsigned old_frame_num = frame_num;
1962 frame_num_updated.wait_for(lock, seconds(1), // Timeout is just in case.
1963 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
1966 Mixer::OutputChannel::~OutputChannel()
1968 if (has_current_frame) {
1969 parent->release_display_frame(¤t_frame);
1971 if (has_ready_frame) {
1972 parent->release_display_frame(&ready_frame);
1976 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1978 // Store this frame for display. Remove the ready frame if any
1979 // (it was seemingly never used).
1981 lock_guard<mutex> lock(frame_mutex);
1982 if (has_ready_frame) {
1983 parent->release_display_frame(&ready_frame);
1985 ready_frame = move(frame);
1986 has_ready_frame = true;
1988 // Call the callbacks under the mutex (they should be short),
1989 // so that we don't race against a callback removal.
1990 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1991 key_and_callback.second();
1995 // Reduce the number of callbacks by filtering duplicates. The reason
1996 // why we bother doing this is that Qt seemingly can get into a state
1997 // where its builds up an essentially unbounded queue of signals,
1998 // consuming more and more memory, and there's no good way of collapsing
1999 // user-defined signals or limiting the length of the queue.
2000 if (transition_names_updated_callback) {
2001 vector<string> transition_names = global_mixer->get_transition_names();
2002 bool changed = false;
2003 if (transition_names.size() != last_transition_names.size()) {
2006 for (unsigned i = 0; i < transition_names.size(); ++i) {
2007 if (transition_names[i] != last_transition_names[i]) {
2014 transition_names_updated_callback(transition_names);
2015 last_transition_names = transition_names;
2018 if (name_updated_callback) {
2019 string name = global_mixer->get_channel_name(channel);
2020 if (name != last_name) {
2021 name_updated_callback(name);
2025 if (color_updated_callback) {
2026 string color = global_mixer->get_channel_color(channel);
2027 if (color != last_color) {
2028 color_updated_callback(color);
2034 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
2036 lock_guard<mutex> lock(frame_mutex);
2037 if (!has_current_frame && !has_ready_frame) {
2041 if (has_current_frame && has_ready_frame) {
2042 // We have a new ready frame. Toss the current one.
2043 parent->release_display_frame(¤t_frame);
2044 has_current_frame = false;
2046 if (has_ready_frame) {
2047 assert(!has_current_frame);
2048 current_frame = move(ready_frame);
2049 ready_frame.ready_fence.reset(); // Drop the refcount.
2050 ready_frame.input_frames.clear(); // Drop the refcounts.
2051 has_current_frame = true;
2052 has_ready_frame = false;
2055 *frame = current_frame;
2059 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
2061 lock_guard<mutex> lock(frame_mutex);
2062 new_frame_ready_callbacks[key] = callback;
2065 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
2067 lock_guard<mutex> lock(frame_mutex);
2068 new_frame_ready_callbacks.erase(key);
2071 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
2073 transition_names_updated_callback = callback;
2076 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
2078 name_updated_callback = callback;
2081 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
2083 color_updated_callback = callback;
2087 void Mixer::start_srt()
2089 SRTSOCKET sock = srt_socket(AF_INET6, 0, 0);
2091 memset(&addr, 0, sizeof(addr));
2092 addr.sin6_family = AF_INET6;
2093 addr.sin6_port = htons(global_flags.srt_port);
2095 int err = srt_bind(sock, (sockaddr *)&addr, sizeof(addr));
2097 fprintf(stderr, "srt_bind: %s\n", srt_getlasterror_str());
2100 err = srt_listen(sock, MAX_VIDEO_CARDS);
2102 fprintf(stderr, "srt_listen: %s\n", srt_getlasterror_str());
2106 srt_thread = thread([this, sock] {
2109 int sa_len = sizeof(addr);
2110 int clientsock = srt_accept(sock, (sockaddr *)&addr, &sa_len);
2112 if (clientsock != -1) {
2113 srt_close(clientsock);
2117 lock_guard<mutex> lock(hotplug_mutex);
2118 hotplugged_srt_cards.push_back(clientsock);
2126 void Mixer::update_srt_stats(int srt_sock, Mixer::CaptureCard *card)
2128 SRT_TRACEBSTATS stats;
2129 srt_bistats(srt_sock, &stats, /*clear=*/0, /*instantaneous=*/1);
2131 card->metric_srt_uptime_seconds = stats.msTimeStamp * 1e-3;
2132 card->metric_srt_send_duration_seconds = stats.usSndDurationTotal * 1e-6;
2133 card->metric_srt_sent_bytes = stats.byteSentTotal;
2134 card->metric_srt_received_bytes = stats.byteRecvTotal;
2135 card->metric_srt_sent_packets_normal = stats.pktSentTotal;
2136 card->metric_srt_received_packets_normal = stats.pktRecvTotal;
2137 card->metric_srt_sent_packets_lost = stats.pktSndLossTotal;
2138 card->metric_srt_received_packets_lost = stats.pktRcvLossTotal;
2139 card->metric_srt_sent_packets_retransmitted = stats.pktRetransTotal;
2140 card->metric_srt_sent_bytes_retransmitted = stats.byteRetransTotal;
2141 card->metric_srt_sent_packets_ack = stats.pktSentACKTotal;
2142 card->metric_srt_received_packets_ack = stats.pktRecvACKTotal;
2143 card->metric_srt_sent_packets_nak = stats.pktSentNAKTotal;
2144 card->metric_srt_received_packets_nak = stats.pktRecvNAKTotal;
2145 card->metric_srt_sent_packets_dropped = stats.pktSndDropTotal;
2146 card->metric_srt_received_packets_dropped = stats.pktRcvDropTotal;
2147 card->metric_srt_sent_bytes_dropped = stats.byteSndDropTotal;
2148 card->metric_srt_received_bytes_dropped = stats.byteRcvDropTotal;
2149 card->metric_srt_received_packets_undecryptable = stats.pktRcvUndecryptTotal;
2150 card->metric_srt_received_bytes_undecryptable = stats.byteRcvUndecryptTotal;
2151 card->metric_srt_filter_sent_packets = stats.pktSndFilterExtraTotal;
2152 card->metric_srt_filter_received_extra_packets = stats.pktRcvFilterExtraTotal;
2153 card->metric_srt_filter_received_rebuilt_packets = stats.pktRcvFilterSupplyTotal;
2154 card->metric_srt_filter_received_lost_packets = stats.pktRcvFilterLossTotal;
2157 card->metric_srt_packet_sending_period_seconds = stats.usPktSndPeriod * 1e-6;
2158 card->metric_srt_flow_window_packets = stats.pktFlowWindow;
2159 card->metric_srt_congestion_window_packets = stats.pktCongestionWindow;
2160 card->metric_srt_flight_size_packets = stats.pktFlightSize;
2161 card->metric_srt_rtt_seconds = stats.msRTT * 1e-3;
2162 card->metric_srt_estimated_bandwidth_bits_per_second = stats.mbpsBandwidth * 1e6;
2163 card->metric_srt_bandwidth_ceiling_bits_per_second = stats.mbpsMaxBW * 1e6;
2164 card->metric_srt_send_buffer_available_bytes = stats.byteAvailSndBuf;
2165 card->metric_srt_receive_buffer_available_bytes = stats.byteAvailRcvBuf;
2166 card->metric_srt_mss_bytes = stats.byteMSS;
2167 card->metric_srt_sender_unacked_packets = stats.pktSndBuf;
2168 card->metric_srt_sender_unacked_bytes = stats.byteSndBuf;
2169 card->metric_srt_sender_unacked_timespan_seconds = stats.msSndBuf * 1e-3;
2170 card->metric_srt_sender_delivery_delay_seconds = stats.msSndTsbPdDelay * 1e-3;
2171 card->metric_srt_receiver_unacked_packets = stats.pktRcvBuf;
2172 card->metric_srt_receiver_unacked_bytes = stats.byteRcvBuf;
2173 card->metric_srt_receiver_unacked_timespan_seconds = stats.msRcvBuf * 1e-3;
2174 card->metric_srt_receiver_delivery_delay_seconds = stats.msRcvTsbPdDelay * 1e-3;
2178 mutex RefCountedGLsync::fence_lock;