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"
44 #include "decklink_util.h"
46 #include "shared/disk_space_estimator.h"
47 #include "ffmpeg_capture.h"
49 #include "image_input.h"
50 #include "input_mapping.h"
51 #include "shared/metrics.h"
52 #include "shared/va_display.h"
53 #include "mjpeg_encoder.h"
54 #include "pbo_frame_allocator.h"
55 #include "shared/ref_counted_gl_sync.h"
56 #include "resampling_queue.h"
57 #include "shared/timebase.h"
58 #include "timecode_renderer.h"
59 #include "v210_converter.h"
60 #include "video_encoder.h"
63 #include <google/protobuf/util/json_util.h>
67 // Must come after CEF, since it includes <syslog.h>, which has #defines
68 // that conflict with CEF logging constants.
75 using namespace movit;
77 using namespace std::chrono;
78 using namespace std::placeholders;
79 using namespace bmusb;
81 Mixer *global_mixer = nullptr;
85 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
88 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
89 input_state->buffered_frames[card_index][frame_num] =
90 input_state->buffered_frames[card_index][frame_num - 1];
92 input_state->buffered_frames[card_index][0] = { frame, field_num };
94 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
95 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
100 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
103 switch (userdata->pixel_format) {
104 case PixelFormat_10BitYCbCr:
105 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
107 case PixelFormat_8BitYCbCr:
108 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
110 case PixelFormat_8BitBGRA:
111 first = userdata->tex_rgba[field] == 0;
113 case PixelFormat_8BitYCbCrPlanar:
114 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
120 const bool recreate_main_texture =
122 width != userdata->last_width[field] ||
123 height != userdata->last_height[field] ||
124 cbcr_width != userdata->last_cbcr_width[field] ||
125 cbcr_height != userdata->last_cbcr_height[field];
126 const bool recreate_v210_texture =
127 global_flags.ten_bit_input &&
128 (first || v210_width != userdata->last_v210_width[field] || height != userdata->last_height[field]);
130 if (recreate_main_texture) {
131 // We changed resolution since last use of this texture, so we need to create
132 // a new object. Note that this each card has its own PBOFrameAllocator,
133 // we don't need to worry about these flip-flopping between resolutions.
134 switch (userdata->pixel_format) {
135 case PixelFormat_10BitYCbCr:
136 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
138 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
141 case PixelFormat_8BitYCbCr: {
142 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
144 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
146 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
148 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
152 case PixelFormat_8BitYCbCrPlanar: {
153 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
155 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
157 glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
159 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
161 glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
163 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
167 case PixelFormat_8BitBGRA:
168 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
170 // NOTE: sRGB may be disabled by sRGBSwitchingFlatInput.
171 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
177 userdata->last_width[field] = width;
178 userdata->last_height[field] = height;
179 userdata->last_cbcr_width[field] = cbcr_width;
180 userdata->last_cbcr_height[field] = cbcr_height;
182 if (recreate_v210_texture) {
183 // Same as above; we need to recreate the texture.
184 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
186 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
188 userdata->last_v210_width[field] = v210_width;
189 userdata->last_height[field] = height;
193 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
195 if (interlaced_stride) {
198 if (global_flags.flush_pbos) {
199 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
203 glBindTexture(GL_TEXTURE_2D, tex);
205 if (interlaced_stride) {
206 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
209 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
213 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
215 glBindTexture(GL_TEXTURE_2D, 0);
217 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
223 void JitterHistory::register_metrics(const vector<pair<string, string>> &labels)
225 global_metrics.add("input_underestimated_jitter_frames", labels, &metric_input_underestimated_jitter_frames);
226 global_metrics.add("input_estimated_max_jitter_seconds", labels, &metric_input_estimated_max_jitter_seconds, Metrics::TYPE_GAUGE);
229 void JitterHistory::unregister_metrics(const vector<pair<string, string>> &labels)
231 global_metrics.remove("input_underestimated_jitter_frames", labels);
232 global_metrics.remove("input_estimated_max_jitter_seconds", labels);
235 void JitterHistory::frame_arrived(steady_clock::time_point now, int64_t frame_duration, size_t dropped_frames, bool verbose)
237 if (frame_duration != last_duration) {
238 // If the frame rate changed, the input clock is also going to change,
239 // so our historical data doesn't make much sense anymore.
240 // Also, format changes typically introduce blips that are not representative
241 // of the typical frame stream. (We make the assumption that format changes
242 // don't happen all the time in regular use; if they did, we should probably
243 // rather keep the history so that we take jitter they may introduce into account.)
245 last_duration = frame_duration;
247 fprintf(stderr, "JITTER %p: clearing due to format change\n", this);
250 if (expected_timestamp > steady_clock::time_point::min()) {
251 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
252 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
254 fprintf(stderr, "JITTER %p: expected_ts=%.6f (after adding %.1f ms for %zu dropped frames, duration=%ld), now=%.6f => %.1f ms late\n",
256 duration<double>(expected_timestamp.time_since_epoch()).count(),
257 1e3 * dropped_frames * duration<double>(nanoseconds(frame_duration * 1000000000 / TIMEBASE)).count(),
260 duration<double>(now.time_since_epoch()).count(),
261 1e3 * duration<double>(now - expected_timestamp).count());
263 history.push_back(orders.insert(jitter_seconds));
264 if (jitter_seconds > estimate_max_jitter()) {
265 ++metric_input_underestimated_jitter_frames;
268 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
270 if (history.size() > history_length) {
271 orders.erase(history.front());
274 assert(history.size() <= history_length);
275 } else if (verbose) {
276 fprintf(stderr, "JITTER %p: now=%.6f, expected=%.6f duration=%ld [initial]\n",
278 duration<double>(now.time_since_epoch()).count(),
279 duration<double>((now + nanoseconds(frame_duration * 1000000000 / TIMEBASE)).time_since_epoch()).count(),
282 expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
285 double JitterHistory::estimate_max_jitter() const
287 if (orders.empty()) {
290 size_t elem_idx = lrint((orders.size() - 1) * percentile);
291 if (percentile <= 0.5) {
292 return *next(orders.begin(), elem_idx) * multiplier;
294 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
298 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
300 global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
303 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
305 global_metrics.remove("input_queue_safe_length_frames", labels);
308 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
309 steady_clock::time_point expected_next_input_frame,
310 int64_t input_frame_duration,
311 int64_t master_frame_duration,
312 double max_input_card_jitter_seconds,
313 double max_master_card_jitter_seconds, bool verbose)
315 double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
316 double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
318 // Figure out when we can expect the next frame for this card, assuming
319 // worst-case jitter (ie., the frame is maximally late).
320 double seconds_until_next_frame = max(duration<double>(expected_next_input_frame - now).count() + max_input_card_jitter_seconds, 0.0);
322 // How many times are the master card expected to tick in that time?
323 // We assume the master clock has worst-case jitter but not any rate
324 // discrepancy, ie., it ticks as early as possible every time, but not
326 double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
328 // As a special case, if the master card ticks faster than the input card,
329 // we expect the queue to drain by itself even without dropping. But if
330 // the difference is small (e.g. 60 Hz master and 59.94 input), it would
331 // go slowly enough that the effect wouldn't really be appreciable.
332 // We account for this by looking at the situation five frames ahead,
333 // assuming everything else is the same.
334 double frames_allowed;
335 if (master_frame_duration < input_frame_duration) {
336 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
338 frames_allowed = frames_needed;
341 fprintf(stderr, "secs_until_next_frame = %.1f ms, input jitter = %.1f ms, master jitter = %.1f ms, frames_allowed = %.3f\n",
342 1e3 * duration<double>(expected_next_input_frame - now).count(),
343 1e3 * max_input_card_jitter_seconds,
344 1e3 * max_master_card_jitter_seconds,
348 safe_queue_length = max<int>(floor(frames_allowed), 0);
349 metric_input_queue_safe_length_frames = safe_queue_length;
352 Mixer::Mixer(const QSurfaceFormat &format)
354 mixer_surface(create_surface(format)),
355 h264_encoder_surface(create_surface(format)),
356 decklink_output_surface(create_surface(format)),
357 image_update_surface(create_surface(format))
359 memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
360 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
363 if (!epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") ||
364 !epoxy_has_gl_extension("GL_ARB_sampler_objects")) {
365 fprintf(stderr, "Nageru requires GL_EXT_texture_sRGB_decode and GL_ARB_sampler_objects to run.\n");
369 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
370 // will be halved when sampling them, and we need to compensate here.
371 movit_texel_subpixel_precision /= 2.0;
373 resource_pool.reset(new ResourcePool);
374 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
375 output_channel[i].parent = this;
376 output_channel[i].channel = i;
379 ImageFormat inout_format;
380 inout_format.color_space = COLORSPACE_sRGB;
381 inout_format.gamma_curve = GAMMA_sRGB;
383 // Matches the 4:2:0 format created by the main chain.
384 YCbCrFormat ycbcr_format;
385 ycbcr_format.chroma_subsampling_x = 2;
386 ycbcr_format.chroma_subsampling_y = 2;
387 if (global_flags.ycbcr_rec709_coefficients) {
388 ycbcr_format.luma_coefficients = YCBCR_REC_709;
390 ycbcr_format.luma_coefficients = YCBCR_REC_601;
392 ycbcr_format.full_range = false;
393 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
394 ycbcr_format.cb_x_position = 0.0f;
395 ycbcr_format.cr_x_position = 0.0f;
396 ycbcr_format.cb_y_position = 0.5f;
397 ycbcr_format.cr_y_position = 0.5f;
399 // Initialize the neutral colors to sane values.
400 for (unsigned i = 0; i < MAX_VIDEO_CARDS; ++i) {
401 last_received_neutral_color[i] = RGBTriplet(1.0f, 1.0f, 1.0f);
404 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
405 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
407 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
408 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
409 display_chain->add_input(display_input);
410 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
411 display_chain->set_dither_bits(0); // Don't bother.
412 display_chain->finalize();
414 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));
415 if (!global_flags.card_to_mjpeg_stream_export.empty()) {
416 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
419 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
420 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get()));
422 // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
423 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
424 audio_mixer.reset(new AudioMixer);
426 httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
427 for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
429 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx + 2);
430 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx + 2)), HTTPD::ALLOW_ALL_ORIGINS);
433 // Start listening for clients only once VideoEncoder has written its header, if any.
434 httpd.start(global_flags.http_port);
436 // First try initializing the then PCI devices, then USB, then
437 // fill up with fake cards until we have the desired number of cards.
438 unsigned num_pci_devices = 0;
439 unsigned card_index = 0;
442 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
443 if (decklink_iterator != nullptr) {
444 for ( ; card_index < unsigned(global_flags.max_num_cards); ++card_index) {
446 if (decklink_iterator->Next(&decklink) != S_OK) {
450 if (!decklink_card_is_active(decklink, card_index)) {
451 fprintf(stderr, "DeckLink card %u is inactive in current profile, skipping (try changing it in Desktop Video Setup)\n", card_index);
456 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
457 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
458 if (!output->set_device(decklink)) {
462 configure_card(card_index, capture, CardType::LIVE_CARD, output, /*is_srt_card=*/false);
465 decklink_iterator->Release();
466 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
468 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
472 unsigned num_usb_devices = BMUSBCapture::num_cards();
473 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < unsigned(global_flags.max_num_cards); ++usb_card_index, ++card_index) {
474 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
475 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
476 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
478 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
480 // Fill up with fake cards for as long as we can, so that the FFmpeg
481 // and HTML cards always come last.
482 unsigned num_fake_cards = 0;
484 size_t num_html_inputs = theme->get_html_inputs().size();
486 size_t num_html_inputs = 0;
488 for ( ; card_index < MAX_VIDEO_CARDS - video_inputs.size() - num_html_inputs; ++card_index) {
489 // Only bother to activate fake capture cards to satisfy the minimum.
490 bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
492 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
493 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
496 configure_card(card_index, nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
500 if (num_fake_cards > 0) {
501 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
504 // Initialize all video inputs the theme asked for.
505 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
506 if (card_index >= MAX_VIDEO_CARDS) {
507 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
510 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
511 video_inputs[video_card_index]->set_card_index(card_index);
513 num_video_inputs = video_inputs.size();
516 // Same, for HTML inputs.
517 std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
518 for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
519 if (card_index >= MAX_VIDEO_CARDS) {
520 fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
523 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
524 html_inputs[html_card_index]->set_card_index(card_index);
526 num_html_inputs = html_inputs.size();
529 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
530 BMUSBCapture::start_bm_thread();
533 if (global_flags.srt_port >= 0) {
538 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
540 if (global_flags.ten_bit_input) {
541 if (!v210Converter::has_hardware_support()) {
542 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
543 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
546 v210_converter.reset(new v210Converter());
548 // These are all the widths listed in the Blackmagic SDK documentation
549 // (section 2.7.3, “Display Modes”).
550 v210_converter->precompile_shader(720);
551 v210_converter->precompile_shader(1280);
552 v210_converter->precompile_shader(1920);
553 v210_converter->precompile_shader(2048);
554 v210_converter->precompile_shader(3840);
555 v210_converter->precompile_shader(4096);
557 if (global_flags.ten_bit_output) {
558 if (!v210Converter::has_hardware_support()) {
559 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
560 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
565 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
566 display_timecode_in_stream = global_flags.display_timecode_in_stream;
567 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
569 if (global_flags.enable_alsa_output) {
570 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
572 if (global_flags.output_card != -1) {
573 desired_output_card_index = global_flags.output_card;
574 set_output_card_internal(global_flags.output_card);
577 output_jitter_history.register_metrics({{ "card", "output" }});
579 ImageInput::start_update_thread(image_update_surface);
584 ImageInput::end_update_thread();
586 if (mjpeg_encoder != nullptr) {
587 mjpeg_encoder->stop();
590 BMUSBCapture::stop_bm_thread();
592 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
593 if (cards[card_index].capture != nullptr) { // Active.
594 cards[card_index].capture->stop_dequeue_thread();
596 if (cards[card_index].output) {
597 cards[card_index].output->end_output();
598 cards[card_index].output.reset();
602 video_encoder.reset(nullptr);
605 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card)
607 bool is_active = capture != nullptr;
609 printf("Configuring card %d...\n", card_index);
611 assert(card_type == CardType::FAKE_CAPTURE);
614 CaptureCard *card = &cards[card_index];
615 if (card->capture != nullptr) {
616 card_mutex.unlock(); // The dequeue thread could be waiting for bm_frame().
617 card->capture->stop_dequeue_thread();
620 card->capture.reset(capture);
621 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
622 if (card->is_fake_capture) {
623 card->fake_capture_counter = fake_capture_counter++;
625 card->is_cef_capture = (card_type == CardType::CEF_INPUT);
626 card->may_have_dropped_last_frame = false;
627 card->type = card_type;
628 if (card->output.get() != output) {
629 card->output.reset(output);
632 PixelFormat pixel_format;
633 if (card_type == CardType::FFMPEG_INPUT) {
634 pixel_format = capture->get_current_pixel_format();
635 } else if (card_type == CardType::CEF_INPUT) {
636 pixel_format = PixelFormat_8BitBGRA;
637 } else if (global_flags.ten_bit_input) {
638 pixel_format = PixelFormat_10BitYCbCr;
640 pixel_format = PixelFormat_8BitYCbCr;
644 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
645 if (card->frame_allocator == nullptr) {
646 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get())); // 8 MB.
648 // The format could have changed, but we cannot reset the allocator
649 // and create a new one from scratch, since there may be allocated
650 // frames from it that expect to call release_frame() on it.
651 // Instead, ask the allocator to create new frames for us and discard
652 // any old ones as they come back. This takes the mutex while
653 // allocating, but nothing should really be sending frames in there
654 // right now anyway (start_bm_capture() has not been called yet).
655 card->frame_allocator->reconfigure(pixel_format, 8 << 20, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get());
657 card->capture->set_video_frame_allocator(card->frame_allocator.get());
658 if (card->surface == nullptr) {
659 card->surface = create_surface_with_same_format(mixer_surface);
661 while (!card->new_frames.empty()) card->new_frames.pop_front();
662 card->last_timecode = -1;
663 card->capture->set_pixel_format(pixel_format);
664 card->capture->configure_card();
666 // NOTE: start_bm_capture() happens in thread_func().
670 assert(card_type == CardType::FFMPEG_INPUT);
673 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
674 unsigned num_channels = card_type == CardType::LIVE_CARD ? 8 : 2;
676 audio_mixer->set_device_parameters(device, card->capture->get_description(), card_type, num_channels, /*active=*/true);
678 // Note: Keeps the previous name, if any.
680 snprintf(name, sizeof(name), "Fake card %u", card_index + 1);
681 audio_mixer->set_device_parameters(device, name, card_type, num_channels, /*active=*/false);
683 audio_mixer->reset_resampler(device);
684 audio_mixer->trigger_state_changed_callback();
686 // Unregister old metrics, if any.
687 if (!card->labels.empty()) {
688 const vector<pair<string, string>> &labels = card->labels;
689 card->jitter_history.unregister_metrics(labels);
690 card->queue_length_policy.unregister_metrics(labels);
691 global_metrics.remove_if_exists("input_received_frames", labels);
692 global_metrics.remove_if_exists("input_dropped_frames_jitter", labels);
693 global_metrics.remove_if_exists("input_dropped_frames_error", labels);
694 global_metrics.remove_if_exists("input_dropped_frames_resets", labels);
695 global_metrics.remove_if_exists("input_queue_length_frames", labels);
696 global_metrics.remove_if_exists("input_queue_duped_frames", labels);
698 global_metrics.remove_if_exists("input_has_signal_bool", labels);
699 global_metrics.remove_if_exists("input_is_connected_bool", labels);
700 global_metrics.remove_if_exists("input_interlaced_bool", labels);
701 global_metrics.remove_if_exists("input_width_pixels", labels);
702 global_metrics.remove_if_exists("input_height_pixels", labels);
703 global_metrics.remove_if_exists("input_frame_rate_nom", labels);
704 global_metrics.remove_if_exists("input_frame_rate_den", labels);
705 global_metrics.remove_if_exists("input_sample_rate_hz", labels);
709 // Global measurements (counters).
710 global_metrics.remove_if_exists("srt_uptime_seconds", labels);
711 global_metrics.remove_if_exists("srt_send_duration_seconds", labels);
712 global_metrics.remove_if_exists("srt_sent_bytes", labels);
713 global_metrics.remove_if_exists("srt_received_bytes", labels);
715 vector<pair<string, string>> packet_labels = card->labels;
716 packet_labels.emplace_back("type", "normal");
717 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
718 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
720 packet_labels.back().second = "lost";
721 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
722 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
724 packet_labels.back().second = "retransmitted";
725 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
726 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
728 packet_labels.back().second = "ack";
729 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
730 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
732 packet_labels.back().second = "nak";
733 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
734 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
736 packet_labels.back().second = "dropped";
737 global_metrics.remove_if_exists("srt_sent_packets", packet_labels);
738 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
739 global_metrics.remove_if_exists("srt_sent_bytes", packet_labels);
740 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
742 packet_labels.back().second = "undecryptable";
743 global_metrics.remove_if_exists("srt_received_packets", packet_labels);
744 global_metrics.remove_if_exists("srt_received_bytes", packet_labels);
746 global_metrics.remove_if_exists("srt_filter_sent_extra_packets", labels);
747 global_metrics.remove_if_exists("srt_filter_received_extra_packets", labels);
748 global_metrics.remove_if_exists("srt_filter_received_rebuilt_packets", labels);
749 global_metrics.remove_if_exists("srt_filter_received_lost_packets", labels);
751 // Instant measurements (gauges).
752 global_metrics.remove_if_exists("srt_packet_sending_period_seconds", labels);
753 global_metrics.remove_if_exists("srt_flow_window_packets", labels);
754 global_metrics.remove_if_exists("srt_congestion_window_packets", labels);
755 global_metrics.remove_if_exists("srt_flight_size_packets", labels);
756 global_metrics.remove_if_exists("srt_rtt_seconds", labels);
757 global_metrics.remove_if_exists("srt_estimated_bandwidth_bits_per_second", labels);
758 global_metrics.remove_if_exists("srt_bandwidth_ceiling_bits_per_second", labels);
759 global_metrics.remove_if_exists("srt_send_buffer_available_bytes", labels);
760 global_metrics.remove_if_exists("srt_receive_buffer_available_bytes", labels);
761 global_metrics.remove_if_exists("srt_mss_bytes", labels);
763 global_metrics.remove_if_exists("srt_sender_unacked_packets", labels);
764 global_metrics.remove_if_exists("srt_sender_unacked_bytes", labels);
765 global_metrics.remove_if_exists("srt_sender_unacked_timespan_seconds", labels);
766 global_metrics.remove_if_exists("srt_sender_delivery_delay_seconds", labels);
768 global_metrics.remove_if_exists("srt_receiver_unacked_packets", labels);
769 global_metrics.remove_if_exists("srt_receiver_unacked_bytes", labels);
770 global_metrics.remove_if_exists("srt_receiver_unacked_timespan_seconds", labels);
771 global_metrics.remove_if_exists("srt_receiver_delivery_delay_seconds", labels);
776 vector<pair<string, string>> labels;
778 snprintf(card_name, sizeof(card_name), "%d", card_index);
779 labels.emplace_back("card", card_name);
782 case CardType::LIVE_CARD:
783 labels.emplace_back("cardtype", "live");
785 case CardType::FAKE_CAPTURE:
786 labels.emplace_back("cardtype", "fake");
788 case CardType::FFMPEG_INPUT:
790 labels.emplace_back("cardtype", "srt");
792 labels.emplace_back("cardtype", "ffmpeg");
795 case CardType::CEF_INPUT:
796 labels.emplace_back("cardtype", "cef");
801 card->jitter_history.register_metrics(labels);
802 card->queue_length_policy.register_metrics(labels);
803 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
804 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
805 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
806 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
807 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
808 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
810 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
811 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
812 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
813 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
814 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
815 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
816 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
817 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
820 // Global measurements (counters).
821 global_metrics.add("srt_uptime_seconds", labels, &card->metric_srt_uptime_seconds);
822 global_metrics.add("srt_send_duration_seconds", labels, &card->metric_srt_send_duration_seconds);
823 global_metrics.add("srt_sent_bytes", labels, &card->metric_srt_sent_bytes);
824 global_metrics.add("srt_received_bytes", labels, &card->metric_srt_received_bytes);
826 vector<pair<string, string>> packet_labels = labels;
827 packet_labels.emplace_back("type", "normal");
828 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_normal);
829 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_normal);
831 packet_labels.back().second = "lost";
832 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_lost);
833 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_lost);
835 packet_labels.back().second = "retransmitted";
836 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_retransmitted);
837 global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_retransmitted);
839 packet_labels.back().second = "ack";
840 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_ack);
841 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_ack);
843 packet_labels.back().second = "nak";
844 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_nak);
845 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_nak);
847 packet_labels.back().second = "dropped";
848 global_metrics.add("srt_sent_packets", packet_labels, &card->metric_srt_sent_packets_dropped);
849 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_dropped);
850 global_metrics.add("srt_sent_bytes", packet_labels, &card->metric_srt_sent_bytes_dropped);
851 global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_dropped);
853 packet_labels.back().second = "undecryptable";
854 global_metrics.add("srt_received_packets", packet_labels, &card->metric_srt_received_packets_undecryptable);
855 global_metrics.add("srt_received_bytes", packet_labels, &card->metric_srt_received_bytes_undecryptable);
857 global_metrics.add("srt_filter_sent_extra_packets", labels, &card->metric_srt_filter_sent_packets);
858 global_metrics.add("srt_filter_received_extra_packets", labels, &card->metric_srt_filter_received_extra_packets);
859 global_metrics.add("srt_filter_received_rebuilt_packets", labels, &card->metric_srt_filter_received_rebuilt_packets);
860 global_metrics.add("srt_filter_received_lost_packets", labels, &card->metric_srt_filter_received_lost_packets);
862 // Instant measurements (gauges).
863 global_metrics.add("srt_packet_sending_period_seconds", labels, &card->metric_srt_packet_sending_period_seconds, Metrics::TYPE_GAUGE);
864 global_metrics.add("srt_flow_window_packets", labels, &card->metric_srt_flow_window_packets, Metrics::TYPE_GAUGE);
865 global_metrics.add("srt_congestion_window_packets", labels, &card->metric_srt_congestion_window_packets, Metrics::TYPE_GAUGE);
866 global_metrics.add("srt_flight_size_packets", labels, &card->metric_srt_flight_size_packets, Metrics::TYPE_GAUGE);
867 global_metrics.add("srt_rtt_seconds", labels, &card->metric_srt_rtt_seconds, Metrics::TYPE_GAUGE);
868 global_metrics.add("srt_estimated_bandwidth_bits_per_second", labels, &card->metric_srt_estimated_bandwidth_bits_per_second, Metrics::TYPE_GAUGE);
869 global_metrics.add("srt_bandwidth_ceiling_bits_per_second", labels, &card->metric_srt_bandwidth_ceiling_bits_per_second, Metrics::TYPE_GAUGE);
870 global_metrics.add("srt_send_buffer_available_bytes", labels, &card->metric_srt_send_buffer_available_bytes, Metrics::TYPE_GAUGE);
871 global_metrics.add("srt_receive_buffer_available_bytes", labels, &card->metric_srt_receive_buffer_available_bytes, Metrics::TYPE_GAUGE);
872 global_metrics.add("srt_mss_bytes", labels, &card->metric_srt_mss_bytes, Metrics::TYPE_GAUGE);
874 global_metrics.add("srt_sender_unacked_packets", labels, &card->metric_srt_sender_unacked_packets, Metrics::TYPE_GAUGE);
875 global_metrics.add("srt_sender_unacked_bytes", labels, &card->metric_srt_sender_unacked_bytes, Metrics::TYPE_GAUGE);
876 global_metrics.add("srt_sender_unacked_timespan_seconds", labels, &card->metric_srt_sender_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
877 global_metrics.add("srt_sender_delivery_delay_seconds", labels, &card->metric_srt_sender_delivery_delay_seconds, Metrics::TYPE_GAUGE);
879 global_metrics.add("srt_receiver_unacked_packets", labels, &card->metric_srt_receiver_unacked_packets, Metrics::TYPE_GAUGE);
880 global_metrics.add("srt_receiver_unacked_bytes", labels, &card->metric_srt_receiver_unacked_bytes, Metrics::TYPE_GAUGE);
881 global_metrics.add("srt_receiver_unacked_timespan_seconds", labels, &card->metric_srt_receiver_unacked_timespan_seconds, Metrics::TYPE_GAUGE);
882 global_metrics.add("srt_receiver_delivery_delay_seconds", labels, &card->metric_srt_receiver_delivery_delay_seconds, Metrics::TYPE_GAUGE);
885 card->labels = labels;
887 card->labels.clear();
891 void Mixer::set_output_card_internal(int card_index)
893 // We don't really need to take card_mutex, since we're in the mixer
894 // thread and don't mess with any queues (which is the only thing that happens
895 // from other threads), but it's probably the safest in the long run.
896 unique_lock<mutex> lock(card_mutex);
897 if (output_card_index != -1) {
898 // Switch the old card from output to input.
899 CaptureCard *old_card = &cards[output_card_index];
900 old_card->output->end_output();
902 // Stop the fake card that we put into place.
903 // This needs to _not_ happen under the mutex, to avoid deadlock
904 // (delivering the last frame needs to take the mutex).
905 CaptureInterface *fake_capture = old_card->capture.get();
907 fake_capture->stop_dequeue_thread();
909 old_card->capture = move(old_card->parked_capture); // TODO: reset the metrics
910 old_card->is_fake_capture = false;
911 old_card->capture->start_bm_capture();
913 if (card_index != -1) {
914 CaptureCard *card = &cards[card_index];
915 CaptureInterface *capture = card->capture.get();
916 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
917 // several seconds to complete (blocking on DisableVideoInput);
918 // see if we can maybe do it asynchronously.
920 capture->stop_dequeue_thread();
922 card->parked_capture = move(card->capture);
923 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
924 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release(), /*is_srt_card=*/false);
925 card->jitter_history.clear();
926 card->capture->start_bm_capture();
927 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
928 card->output->start_output(desired_output_video_mode, pts_int, /*is_master_card=*/slave_to_output);
930 output_card_index = card_index;
931 output_jitter_history.clear();
936 int unwrap_timecode(uint16_t current_wrapped, int last)
938 uint16_t last_wrapped = last & 0xffff;
939 if (current_wrapped > last_wrapped) {
940 return (last & ~0xffff) | current_wrapped;
942 return 0x10000 + ((last & ~0xffff) | current_wrapped);
948 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
949 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
950 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
952 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
953 CaptureCard *card = &cards[card_index];
955 ++card->metric_input_received_frames;
956 card->metric_input_has_signal_bool = video_format.has_signal;
957 card->metric_input_is_connected_bool = video_format.is_connected;
958 card->metric_input_interlaced_bool = video_format.interlaced;
959 card->metric_input_width_pixels = video_format.width;
960 card->metric_input_height_pixels = video_format.height;
961 card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
962 card->metric_input_frame_rate_den = video_format.frame_rate_den;
963 card->metric_input_sample_rate_hz = audio_format.sample_rate;
965 if (is_mode_scanning[card_index]) {
966 if (video_format.has_signal) {
967 // Found a stable signal, so stop scanning.
968 is_mode_scanning[card_index] = false;
970 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
971 steady_clock::time_point now = steady_clock::now();
972 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
973 if (sec_since_last_switch > switch_time_s) {
974 // It isn't this mode; try the next one.
975 mode_scanlist_index[card_index]++;
976 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
977 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
978 last_mode_scan_change[card_index] = now;
983 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
984 assert(frame_length > 0);
986 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;
987 if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
988 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",
989 description_for_card(card_index).c_str(), int(audio_frame.len), int(audio_offset),
990 timecode, int(video_frame.len), int(video_offset), video_format.id);
991 if (video_frame.owner) {
992 video_frame.owner->release_frame(video_frame);
994 if (audio_frame.owner) {
995 audio_frame.owner->release_frame(audio_frame);
1000 int dropped_frames = 0;
1001 if (card->last_timecode != -1) {
1002 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
1005 // Number of samples per frame if we need to insert silence.
1006 // (Could be nonintegral, but resampling will save us then.)
1007 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
1009 if (dropped_frames > MAX_FPS * 2) {
1010 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
1011 description_for_card(card_index).c_str(), card->last_timecode, timecode);
1012 audio_mixer->reset_resampler(device);
1014 ++card->metric_input_resets;
1015 } else if (dropped_frames > 0) {
1016 // Insert silence as needed.
1017 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
1018 description_for_card(card_index).c_str(), dropped_frames, timecode);
1019 card->metric_input_dropped_frames_error += dropped_frames;
1023 success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
1027 if (num_samples > 0) {
1028 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
1030 // Audio for the MJPEG stream. We don't resample; audio that's not in 48 kHz
1031 // just gets dropped for now.
1033 // Only bother doing MJPEG encoding if there are any connected clients
1034 // that want the stream.
1035 if (httpd.get_num_connected_multicam_clients() > 0 ||
1036 httpd.get_num_connected_siphon_clients(card_index) > 0) {
1037 vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
1038 lock_guard<mutex> lock(card_mutex);
1039 if (card->new_raw_audio.empty()) {
1040 card->new_raw_audio = move(converted_samples);
1042 // For raw audio, we don't really synchronize audio and video;
1043 // we just put the audio in frame by frame, and if a video frame is
1044 // dropped, we still keep the audio, which means it will be added
1045 // to the beginning of the next frame. It would probably be better
1046 // to move the audio pts earlier to show this, but most players can
1047 // live with some jitter, and in a lot of ways, it's much nicer for
1048 // Futatabi to have all audio locked to a video frame.
1049 card->new_raw_audio.insert(card->new_raw_audio.end(), converted_samples.begin(), converted_samples.end());
1051 // Truncate to one second, just to be sure we don't have infinite buildup in case of weirdness.
1052 if (card->new_raw_audio.size() > OUTPUT_FREQUENCY * 2) {
1053 size_t excess_samples = card->new_raw_audio.size() - OUTPUT_FREQUENCY * 2;
1054 card->new_raw_audio.erase(card->new_raw_audio.begin(), card->new_raw_audio.begin() + excess_samples);
1060 // Done with the audio, so release it.
1061 if (audio_frame.owner) {
1062 audio_frame.owner->release_frame(audio_frame);
1065 card->last_timecode = timecode;
1067 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
1068 if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
1069 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1070 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
1071 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
1074 if (card->type == CardType::FFMPEG_INPUT) {
1075 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
1076 if (srt_sock != -1) {
1077 update_srt_stats(srt_sock, card);
1082 size_t y_offset, cbcr_offset;
1083 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
1084 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1085 // The calculation above is wrong for planar Y'CbCr, so just override it.
1086 assert(card->type == CardType::FFMPEG_INPUT);
1087 assert(video_offset == 0);
1088 expected_length = video_frame.len;
1090 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
1092 cbcr_offset = video_format.width * video_format.height;
1094 // All the other Y'CbCr formats are 4:2:2.
1095 y_offset = video_frame.size / 2 + video_offset / 2;
1096 cbcr_offset = video_offset / 2;
1098 if (video_frame.len - video_offset == 0 ||
1099 video_frame.len - video_offset != expected_length) {
1100 if (video_frame.len != 0) {
1101 printf("%s: Dropping video frame with wrong length (%zu; expected %zu)\n",
1102 description_for_card(card_index).c_str(), video_frame.len - video_offset, expected_length);
1104 if (video_frame.owner) {
1105 video_frame.owner->release_frame(video_frame);
1108 // Still send on the information that we _had_ a frame, even though it's corrupted,
1109 // so that pts can go up accordingly.
1111 lock_guard<mutex> lock(card_mutex);
1112 CaptureCard::NewFrame new_frame;
1113 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
1114 new_frame.length = frame_length;
1115 new_frame.interlaced = false;
1116 new_frame.dropped_frames = dropped_frames;
1117 new_frame.received_timestamp = video_frame.received_timestamp;
1118 card->new_frames.push_back(move(new_frame));
1119 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1121 card->new_frames_changed.notify_all();
1125 unsigned num_fields = video_format.interlaced ? 2 : 1;
1126 steady_clock::time_point frame_upload_start;
1127 if (video_format.interlaced) {
1128 // Send the two fields along as separate frames; the other side will need to add
1129 // a deinterlacer to actually get this right.
1130 assert(video_format.height % 2 == 0);
1131 video_format.height /= 2;
1132 assert(frame_length % 2 == 0);
1135 frame_upload_start = steady_clock::now();
1137 assert(userdata != nullptr);
1138 userdata->last_interlaced = video_format.interlaced;
1139 userdata->last_has_signal = video_format.has_signal;
1140 userdata->last_is_connected = video_format.is_connected;
1141 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
1142 userdata->last_frame_rate_den = video_format.frame_rate_den;
1143 RefCountedFrame frame(video_frame);
1145 // Send the frames on to the main thread, which will upload and process htem.
1146 // It is entirely possible to upload them in the same thread (and it might even be
1147 // faster, depending on the GPU and driver), but it appears to be trickling
1148 // driver bugs very easily.
1150 // Note that this means we must hold on to the actual frame data in <userdata>
1151 // until the upload is done, but we hold on to <frame> much longer than that
1152 // (in fact, all the way until we no longer use the texture in rendering).
1153 for (unsigned field = 0; field < num_fields; ++field) {
1155 // Don't upload the second field as fast as we can; wait until
1156 // the field time has approximately passed. (Otherwise, we could
1157 // get timing jitter against the other sources, and possibly also
1158 // against the video display, although the latter is not as critical.)
1159 // This requires our system clock to be reasonably close to the
1160 // video clock, but that's not an unreasonable assumption.
1161 steady_clock::time_point second_field_start = frame_upload_start +
1162 nanoseconds(frame_length * 1000000000 / TIMEBASE);
1163 this_thread::sleep_until(second_field_start);
1167 lock_guard<mutex> lock(card_mutex);
1168 CaptureCard::NewFrame new_frame;
1169 new_frame.frame = frame;
1170 new_frame.length = frame_length;
1171 new_frame.field = field;
1172 new_frame.interlaced = video_format.interlaced;
1173 new_frame.dropped_frames = dropped_frames;
1174 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
1175 new_frame.video_format = video_format;
1176 new_frame.video_offset = video_offset;
1177 new_frame.y_offset = y_offset;
1178 new_frame.cbcr_offset = cbcr_offset;
1179 new_frame.texture_uploaded = false;
1180 if (card->type == CardType::FFMPEG_INPUT) {
1181 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1182 new_frame.neutral_color = ffmpeg_capture->get_last_neutral_color();
1184 card->new_frames.push_back(move(new_frame));
1185 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1186 card->may_have_dropped_last_frame = false;
1188 card->new_frames_changed.notify_all();
1192 void Mixer::upload_texture_for_frame(
1193 int field, bmusb::VideoFormat video_format,
1194 size_t y_offset, size_t cbcr_offset, size_t video_offset, PBOFrameAllocator::Userdata *userdata)
1196 size_t cbcr_width, cbcr_height;
1197 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1198 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
1199 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
1201 // All the other Y'CbCr formats are 4:2:2.
1202 cbcr_width = video_format.width / 2;
1203 cbcr_height = video_format.height;
1206 bool interlaced_stride = video_format.interlaced && (video_format.second_field_start == 1);
1207 if (video_format.interlaced) {
1211 unsigned field_start_line;
1213 field_start_line = video_format.second_field_start;
1215 field_start_line = video_format.extra_lines_top;
1218 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
1219 size_t v210_width = video_format.stride / sizeof(uint32_t);
1220 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
1222 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
1225 switch (userdata->pixel_format) {
1226 case PixelFormat_10BitYCbCr: {
1227 size_t field_start = video_offset + video_format.stride * field_start_line;
1228 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);
1229 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
1232 case PixelFormat_8BitYCbCr: {
1233 size_t field_y_start = y_offset + video_format.width * field_start_line;
1234 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
1236 // Make up our own strides, since we are interleaving.
1237 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);
1238 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);
1241 case PixelFormat_8BitYCbCrPlanar: {
1242 assert(field_start_line == 0); // We don't really support interlaced here.
1243 size_t field_y_start = y_offset;
1244 size_t field_cb_start = cbcr_offset;
1245 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
1247 // Make up our own strides, since we are interleaving.
1248 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);
1249 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
1250 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
1253 case PixelFormat_8BitBGRA: {
1254 size_t field_start = video_offset + video_format.stride * field_start_line;
1255 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);
1256 // These could be asked to deliver mipmaps at any time.
1257 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
1259 glGenerateMipmap(GL_TEXTURE_2D);
1261 glBindTexture(GL_TEXTURE_2D, 0);
1269 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
1273 void Mixer::bm_hotplug_add(libusb_device *dev)
1275 lock_guard<mutex> lock(hotplug_mutex);
1276 hotplugged_cards.push_back(dev);
1279 void Mixer::bm_hotplug_remove(unsigned card_index)
1281 cards[card_index].new_frames_changed.notify_all();
1284 void Mixer::thread_func()
1286 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
1288 eglBindAPI(EGL_OPENGL_API);
1289 QOpenGLContext *context = create_context(mixer_surface);
1290 if (!make_current(context, mixer_surface)) {
1295 // Start the actual capture. (We don't want to do it before we're actually ready
1296 // to process output frames.)
1297 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1298 if (int(card_index) != output_card_index && cards[card_index].capture != nullptr) {
1299 cards[card_index].capture->start_bm_capture();
1303 BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1304 int stats_dropped_frames = 0;
1306 while (!should_quit) {
1307 if (desired_output_card_index != output_card_index) {
1308 set_output_card_internal(desired_output_card_index);
1310 if (output_card_index != -1 &&
1311 desired_output_video_mode != output_video_mode) {
1312 DeckLinkOutput *output = cards[output_card_index].output.get();
1313 output->end_output();
1314 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1315 output->start_output(desired_output_video_mode, pts_int, /*is_master_card=*/slave_to_output);
1319 lock_guard<mutex> lock(card_mutex);
1320 handle_hotplugged_cards();
1323 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1324 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1326 bool master_card_is_output;
1327 unsigned master_card_index;
1328 if (output_card_index != -1 && slave_to_output) {
1329 master_card_is_output = true;
1330 master_card_index = output_card_index;
1332 master_card_is_output = false;
1333 master_card_index = theme->map_signal_to_card(master_clock_channel);
1334 assert(master_card_index < MAX_VIDEO_CARDS);
1337 vector<int32_t> raw_audio[MAX_VIDEO_CARDS]; // For MJPEG encoding.
1338 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame, raw_audio);
1339 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);
1340 stats_dropped_frames += output_frame_info.dropped_frames;
1342 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1343 if (card_index == master_card_index || !has_new_frame[card_index]) {
1346 if (new_frames[card_index].frame->len == 0) {
1347 ++new_frames[card_index].dropped_frames;
1349 if (new_frames[card_index].dropped_frames > 0) {
1350 printf("%s dropped %d frames before this\n",
1351 description_for_card(card_index).c_str(), int(new_frames[card_index].dropped_frames));
1355 // If the first card is reporting a corrupted or otherwise dropped frame,
1356 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1357 if (!master_card_is_output &&
1358 new_frames[master_card_index].frame != nullptr && // Timeout.
1359 new_frames[master_card_index].frame->len == 0) {
1360 ++stats_dropped_frames;
1361 pts_int += new_frames[master_card_index].length;
1365 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1366 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1369 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1370 assert(new_frame->frame != nullptr);
1371 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1374 // The new texture might need uploading before use.
1375 if (!new_frame->texture_uploaded) {
1376 upload_texture_for_frame(new_frame->field, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset,
1377 new_frame->video_offset, (PBOFrameAllocator::Userdata *)new_frame->frame->userdata);
1378 new_frame->texture_uploaded = true;
1381 // Only set the white balance if it actually changed. This means that the user
1382 // is free to override the white balance in a video with no white balance information
1383 // actually set (ie. r=g=b=1 all the time), or one where the white point is wrong,
1384 // but frame-to-frame decisions will be heeded. We do this pretty much as late
1385 // as possible (ie., after picking out the frame from the buffer), so that we are sure
1386 // that the change takes effect on exactly the right frame.
1387 if (fabs(new_frame->neutral_color.r - last_received_neutral_color[card_index].r) > 1e-3 ||
1388 fabs(new_frame->neutral_color.g - last_received_neutral_color[card_index].g) > 1e-3 ||
1389 fabs(new_frame->neutral_color.b - last_received_neutral_color[card_index].b) > 1e-3) {
1390 theme->set_wb_for_card(card_index, new_frame->neutral_color.r, new_frame->neutral_color.g, new_frame->neutral_color.b);
1391 last_received_neutral_color[card_index] = new_frame->neutral_color;
1394 if (new_frame->frame->data_copy != nullptr && mjpeg_encoder->should_encode_mjpeg_for_card(card_index)) {
1395 RGBTriplet neutral_color = theme->get_white_balance_for_card(card_index);
1396 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);
1401 int64_t frame_duration = output_frame_info.frame_duration;
1402 render_one_frame(frame_duration);
1404 lock_guard<mutex> lock(frame_num_mutex);
1407 frame_num_updated.notify_all();
1408 pts_int += frame_duration;
1410 basic_stats.update(frame_num, stats_dropped_frames);
1411 // if (frame_num % 100 == 0) chain->print_phase_timing();
1413 if (should_cut.exchange(false)) { // Test and clear.
1414 video_encoder->do_cut(frame_num);
1418 // Reset every 100 frames, so that local variations in frame times
1419 // (especially for the first few frames, when the shaders are
1420 // compiled etc.) don't make it hard to measure for the entire
1421 // remaining duration of the program.
1422 if (frame == 10000) {
1430 resource_pool->clean_context();
1433 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1435 if (output_card_index != -1 && slave_to_output) {
1436 // The output card (ie., cards[output_card_index].output) is the master clock,
1437 // so no input card (ie., cards[card_index].capture) is.
1440 return (card_index == master_card_index);
1443 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1445 // Count the number of frames in the queue, including any frames
1446 // we dropped. It's hard to know exactly how we should deal with
1447 // dropped (corrupted) input frames; they don't help our goal of
1448 // avoiding starvation, but they still add to the problem of latency.
1449 // Since dropped frames is going to mean a bump in the signal anyway,
1450 // we err on the side of having more stable latency instead.
1451 unsigned queue_length = 0;
1452 for (const CaptureCard::NewFrame &frame : card->new_frames) {
1453 queue_length += frame.dropped_frames + 1;
1456 // If needed, drop frames until the queue is below the safe limit.
1457 // We prefer to drop from the head, because all else being equal,
1458 // we'd like more recent frames (less latency).
1459 unsigned dropped_frames = 0;
1460 while (queue_length > safe_queue_length) {
1461 assert(!card->new_frames.empty());
1462 assert(queue_length > card->new_frames.front().dropped_frames);
1463 queue_length -= card->new_frames.front().dropped_frames;
1465 if (queue_length <= safe_queue_length) {
1466 // No need to drop anything.
1470 card->new_frames.pop_front();
1471 card->new_frames_changed.notify_all();
1475 if (queue_length == 0 && card->is_cef_capture) {
1476 card->may_have_dropped_last_frame = true;
1480 card->metric_input_dropped_frames_jitter += dropped_frames;
1481 card->metric_input_queue_length_frames = queue_length;
1484 if (dropped_frames > 0) {
1485 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1486 card_index, dropped_frames);
1491 pair<string, string> Mixer::get_channels_json()
1494 for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
1495 Channel *channel = ret.add_channel();
1496 channel->set_index(channel_idx + 2);
1497 channel->set_name(theme->get_channel_name(channel_idx + 2));
1498 channel->set_color(theme->get_channel_color(channel_idx + 2));
1501 google::protobuf::util::MessageToJsonString(ret, &contents); // Ignore any errors.
1502 return make_pair(contents, "text/json");
1505 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1507 return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1510 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])
1512 OutputFrameInfo output_frame_info;
1513 constexpr steady_clock::duration master_card_timeout = milliseconds(200);
1515 unique_lock<mutex> lock(card_mutex, defer_lock);
1516 bool timed_out = false;
1517 if (master_card_is_output) {
1518 // Clocked to the output, so wait for it to be ready for the next frame.
1519 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);
1522 // Wait for the master card to have a new frame.
1523 output_frame_info.is_preroll = false;
1525 timed_out = !cards[master_card_index].new_frames_changed.wait_for(lock,
1526 master_card_timeout,
1527 [this, master_card_index] {
1528 return !cards[master_card_index].new_frames.empty() ||
1529 cards[master_card_index].capture == nullptr ||
1530 cards[master_card_index].capture->get_disconnected();
1533 fprintf(stderr, "WARNING: Master card (%s) did not deliver a frame for %u ms, creating a fake one.\n",
1534 description_for_card(master_card_index).c_str(),
1535 unsigned(duration_cast<milliseconds>(master_card_timeout).count()));
1540 // The master card stalled for 200 ms (possible when it's e.g.
1541 // an SRT card). Send a frame no matter what; this also makes sure
1542 // any other cards get to empty their queues, and in general,
1543 // that we make _some_ sort of forward progress.
1544 handle_hotplugged_cards();
1545 } else if (master_card_is_output) {
1546 handle_hotplugged_cards();
1547 } else if (cards[master_card_index].new_frames.empty()) {
1548 // We were woken up, but not due to a new frame. Deal with it
1549 // and then restart.
1550 assert(cards[master_card_index].capture == nullptr ||
1551 cards[master_card_index].capture->get_disconnected());
1552 handle_hotplugged_cards();
1557 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1558 CaptureCard *card = &cards[card_index];
1559 if (card->new_frames.empty()) { // Starvation.
1560 ++card->metric_input_duped_frames;
1562 if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1563 // Unlike other sources, CEF is not guaranteed to send us a steady
1564 // stream of frames, so we'll have to ask it to repaint the frame
1565 // we dropped. (may_have_dropped_last_frame is set whenever we
1566 // trim the queue completely away, and cleared when we actually
1567 // get a new frame.)
1568 ((CEFCapture *)card->capture.get())->request_new_frame(/*ignore_if_locked=*/true);
1572 new_frames[card_index] = move(card->new_frames.front());
1573 has_new_frame[card_index] = true;
1574 card->new_frames.pop_front();
1575 card->new_frames_changed.notify_all();
1578 raw_audio[card_index] = move(card->new_raw_audio);
1582 // Pretend the frame happened a while ago and was only processed now,
1583 // so that we get the duration sort-of right. This isn't ideal.
1584 output_frame_info.dropped_frames = 0; // Hard to define, really.
1585 output_frame_info.frame_duration = lrint(TIMEBASE * duration<double>(master_card_timeout).count());
1586 output_frame_info.frame_timestamp = steady_clock::now() - master_card_timeout;
1587 } else if (!master_card_is_output) {
1588 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1589 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1590 output_frame_info.frame_duration = new_frames[master_card_index].length;
1593 if (!output_frame_info.is_preroll) {
1594 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1597 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1598 CaptureCard *card = &cards[card_index];
1599 if (has_new_frame[card_index] &&
1600 !input_card_is_master_clock(card_index, master_card_index) &&
1601 !output_frame_info.is_preroll) {
1602 card->queue_length_policy.update_policy(
1603 output_frame_info.frame_timestamp,
1604 card->jitter_history.get_expected_next_frame(),
1605 new_frames[master_card_index].length,
1606 output_frame_info.frame_duration,
1607 card->jitter_history.estimate_max_jitter(),
1608 output_jitter_history.estimate_max_jitter());
1609 trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1610 card->queue_length_policy.get_safe_queue_length()));
1614 // This might get off by a fractional sample when changing master card
1615 // between ones with different frame rates, but that's fine.
1616 int64_t num_samples_times_timebase = int64_t(OUTPUT_FREQUENCY) * output_frame_info.frame_duration + fractional_samples;
1617 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1618 fractional_samples = num_samples_times_timebase % TIMEBASE;
1619 assert(output_frame_info.num_samples >= 0);
1622 DeviceSpec device{InputSourceType::CAPTURE_CARD, master_card_index};
1625 success = audio_mixer->add_silence(device, output_frame_info.num_samples, /*dropped_frames=*/0);
1629 return output_frame_info;
1632 void Mixer::handle_hotplugged_cards()
1634 // Check for cards that have been disconnected since last frame.
1635 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1636 CaptureCard *card = &cards[card_index];
1637 if (card->capture != nullptr && card->capture->get_disconnected()) {
1638 bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
1640 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1641 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1642 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1643 card->jitter_history.clear();
1644 card->capture->start_bm_capture();
1646 // NOTE: The theme might end up forcing the card back at some later point
1647 // (ie., force_active is false now, but might immediately be true again on
1648 // e.g. the next frame). That should be rare, though, so we don't bother
1649 // adjusting the message.
1650 fprintf(stderr, "Card %u went away, removing. (To keep a fake card, increase --num-cards.)\n", card_index);
1651 theme->remove_card(card_index);
1652 configure_card(card_index, /*capture=*/nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1653 card->jitter_history.clear();
1658 // Count how many active cards we already have. Used below to check that we
1659 // don't go past the max_cards limit set by the user. Note that (non-SRT) video
1660 // and HTML “cards” don't count towards this limit.
1661 int num_video_cards = 0;
1662 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1663 CaptureCard *card = &cards[card_index];
1664 if (card->type == CardType::LIVE_CARD || is_srt_card(card)) {
1669 // Check for cards that have been connected since last frame.
1670 vector<libusb_device *> hotplugged_cards_copy;
1672 vector<int> hotplugged_srt_cards_copy;
1675 lock_guard<mutex> lock(hotplug_mutex);
1676 swap(hotplugged_cards, hotplugged_cards_copy);
1678 swap(hotplugged_srt_cards, hotplugged_srt_cards_copy);
1681 for (libusb_device *new_dev : hotplugged_cards_copy) {
1682 // Look for a fake capture card where we can stick this in.
1683 int free_card_index = -1;
1684 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1685 if (cards[card_index].is_fake_capture) {
1686 free_card_index = card_index;
1691 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1692 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1693 libusb_unref_device(new_dev);
1695 // BMUSBCapture takes ownership.
1696 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1697 CaptureCard *card = &cards[free_card_index];
1698 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1699 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
1700 card->jitter_history.clear();
1701 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1702 capture->start_bm_capture();
1707 // Same, for SRT inputs.
1708 for (SRTSOCKET sock : hotplugged_srt_cards_copy) {
1710 int namelen = sizeof(name);
1711 srt_getsockopt(sock, /*ignored=*/0, SRTO_STREAMID, name, &namelen);
1712 string stream_id(name, namelen);
1714 // Look for a fake capture card where we can stick this in.
1715 // Prioritize ones that previously held SRT streams with the
1716 // same stream ID, if any exist -- and it multiple exist,
1717 // take the one that disconnected the last.
1718 int first_free_card_index = -1, last_matching_free_card_index = -1;
1719 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1720 CaptureCard *card = &cards[card_index];
1721 if (!card->is_fake_capture) {
1724 if (first_free_card_index == -1) {
1725 first_free_card_index = card_index;
1727 if (card->last_srt_stream_id == stream_id &&
1728 (last_matching_free_card_index == -1 ||
1729 card->fake_capture_counter >
1730 cards[last_matching_free_card_index].fake_capture_counter)) {
1731 last_matching_free_card_index = card_index;
1735 const int free_card_index = (last_matching_free_card_index != -1)
1736 ? last_matching_free_card_index : first_free_card_index;
1737 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1738 if (stream_id.empty()) {
1739 stream_id = "no name";
1741 fprintf(stderr, "New SRT stream connected (%s), but no free slots -- ignoring.\n", stream_id.c_str());
1744 // FFmpegCapture takes ownership.
1745 if (stream_id.empty()) {
1746 fprintf(stderr, "New unnamed SRT stream connected, choosing slot %d.\n", free_card_index);
1748 fprintf(stderr, "New SRT stream connected (%s), choosing slot %d.\n", stream_id.c_str(), free_card_index);
1750 CaptureCard *card = &cards[free_card_index];
1751 FFmpegCapture *capture = new FFmpegCapture(sock, stream_id);
1752 capture->set_card_index(free_card_index);
1753 configure_card(free_card_index, capture, CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/true);
1754 update_srt_stats(sock, card); // Initial zero stats.
1755 card->last_srt_stream_id = stream_id;
1756 card->jitter_history.clear();
1757 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1758 capture->start_bm_capture();
1763 // Finally, newly forced-to-active fake capture cards.
1764 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1765 CaptureCard *card = &cards[card_index];
1766 if (card->capture == nullptr && card->force_active) {
1767 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1768 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1769 card->jitter_history.clear();
1770 card->capture->start_bm_capture();
1776 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)
1778 // Resample the audio as needed, including from previously dropped frames.
1779 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1780 const bool dropped_frame = (frame_num != dropped_frames);
1782 // Signal to the audio thread to process this frame.
1783 // Note that if the frame is a dropped frame, we signal that
1784 // we don't want to use this frame as base for adjusting
1785 // the resampler rate. The reason for this is that the timing
1786 // of these frames is often way too late; they typically don't
1787 // “arrive” before we synthesize them. Thus, we could end up
1788 // in a situation where we have inserted e.g. five audio frames
1789 // into the queue before we then start pulling five of them
1790 // back out. This makes ResamplingQueue overestimate the delay,
1791 // causing undue resampler changes. (We _do_ use the last,
1792 // non-dropped frame; perhaps we should just discard that as well,
1793 // since dropped frames are expected to be rare, and it might be
1794 // better to just wait until we have a slightly more normal situation).
1795 lock_guard<mutex> lock(audio_mutex);
1796 bool adjust_rate = !dropped_frame && !is_preroll;
1797 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1798 audio_task_queue_changed.notify_one();
1800 if (dropped_frame) {
1801 // For dropped frames, increase the pts. Note that if the format changed
1802 // in the meantime, we have no way of detecting that; we just have to
1803 // assume the frame length is always the same.
1804 pts_int += length_per_frame;
1809 void Mixer::render_one_frame(int64_t duration)
1811 // Determine the time code for this frame before we start rendering.
1812 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1813 if (display_timecode_on_stdout) {
1814 printf("Timecode: '%s'\n", timecode_text.c_str());
1817 // Update Y'CbCr settings for all cards.
1819 lock_guard<mutex> lock(card_mutex);
1820 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1821 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1822 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1823 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1824 input_state.full_range[card_index] = interpretation->full_range;
1828 // Get the main chain from the theme, and set its state immediately.
1829 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1830 EffectChain *chain = theme_main_chain.chain;
1831 theme_main_chain.setup_chain();
1832 //theme_main_chain.chain->enable_phase_timing(true);
1834 // If HDMI/SDI output is active and the user has requested auto mode,
1835 // its mode overrides the existing Y'CbCr setting for the chain.
1836 YCbCrLumaCoefficients ycbcr_output_coefficients;
1837 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1838 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1840 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1843 // TODO: Reduce the duplication against theme.cpp.
1844 YCbCrFormat output_ycbcr_format;
1845 output_ycbcr_format.chroma_subsampling_x = 1;
1846 output_ycbcr_format.chroma_subsampling_y = 1;
1847 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1848 output_ycbcr_format.full_range = false;
1849 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1850 chain->change_ycbcr_output_format(output_ycbcr_format);
1852 // Render main chain. If we're using zerocopy Quick Sync encoding
1853 // (the default case), we take an extra copy of the created outputs,
1854 // so that we can display it back to the screen later (it's less memory
1855 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1856 // Ideally, we'd like to avoid taking copies and just use the main textures
1857 // for display as well, but they're just views into VA-API memory and must be
1858 // unmapped during encoding, so we can't use them for display, unfortunately.
1859 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1860 GLuint y_copy_tex, cbcr_copy_tex = 0;
1861 GLuint y_display_tex, cbcr_display_tex;
1862 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1863 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1864 const bool is_zerocopy = video_encoder->is_zerocopy();
1866 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1867 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1868 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1870 y_display_tex = y_copy_tex;
1871 cbcr_display_tex = cbcr_copy_tex;
1873 // y_tex and cbcr_tex will be given by VideoEncoder.
1875 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1876 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1877 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1879 y_display_tex = y_tex;
1880 cbcr_display_tex = cbcr_tex;
1883 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1884 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1889 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1891 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1894 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1896 if (display_timecode_in_stream) {
1897 // Render the timecode on top.
1898 timecode_renderer->render_timecode(fbo, timecode_text);
1901 resource_pool->release_fbo(fbo);
1904 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1906 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1908 if (output_card_index != -1) {
1909 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1911 resource_pool->release_2d_texture(cbcr_full_tex);
1913 // Set the right state for the Y' and CbCr textures we use for display.
1914 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1915 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1916 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1917 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1918 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1920 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1921 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1922 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1923 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1925 RefCountedGLsync fence = video_encoder->end_frame();
1927 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1928 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1929 DisplayFrame live_frame;
1930 live_frame.chain = display_chain.get();
1931 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1932 display_input->set_texture_num(0, y_display_tex);
1933 display_input->set_texture_num(1, cbcr_display_tex);
1935 live_frame.ready_fence = fence;
1936 live_frame.input_frames = {};
1937 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1938 output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1940 // Set up preview and any additional channels.
1941 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1942 DisplayFrame display_frame;
1943 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1944 display_frame.chain = move(chain.chain);
1945 display_frame.setup_chain = move(chain.setup_chain);
1946 display_frame.ready_fence = fence;
1947 display_frame.input_frames = move(chain.input_frames);
1948 display_frame.temp_textures = {};
1949 output_channel[i].output_frame(move(display_frame));
1953 void Mixer::audio_thread_func()
1955 pthread_setname_np(pthread_self(), "Mixer_Audio");
1957 while (!should_quit) {
1961 unique_lock<mutex> lock(audio_mutex);
1962 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1966 task = audio_task_queue.front();
1967 audio_task_queue.pop();
1970 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1971 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1972 vector<float> samples_out = audio_mixer->get_output(
1973 task.frame_timestamp,
1975 rate_adjustment_policy);
1977 // Send the samples to the sound card, then add them to the output.
1979 alsa->write(samples_out);
1981 if (output_card_index != -1) {
1982 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1983 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1985 video_encoder->add_audio(task.pts_int, move(samples_out));
1989 void Mixer::release_display_frame(DisplayFrame *frame)
1991 for (GLuint texnum : frame->temp_textures) {
1992 resource_pool->release_2d_texture(texnum);
1994 frame->temp_textures.clear();
1995 frame->ready_fence.reset();
1996 frame->input_frames.clear();
2001 mixer_thread = thread(&Mixer::thread_func, this);
2002 audio_thread = thread(&Mixer::audio_thread_func, this);
2008 audio_task_queue_changed.notify_one();
2009 mixer_thread.join();
2010 audio_thread.join();
2012 if (global_flags.srt_port >= 0) {
2013 // There's seemingly no other reasonable way to wake up the thread
2014 // (libsrt's epoll equivalent is busy-waiting).
2015 int sock = srt_create_socket();
2018 memset(&addr, 0, sizeof(addr));
2019 addr.sin6_family = AF_INET6;
2020 addr.sin6_addr = IN6ADDR_LOOPBACK_INIT;
2021 addr.sin6_port = htons(global_flags.srt_port);
2022 srt_connect(sock, (sockaddr *)&addr, sizeof(addr));
2030 void Mixer::transition_clicked(int transition_num)
2032 theme->transition_clicked(transition_num, pts());
2035 void Mixer::channel_clicked(int preview_num)
2037 theme->channel_clicked(preview_num);
2040 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
2042 lock_guard<mutex> lock(card_mutex);
2043 return ycbcr_interpretation[card_index];
2046 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
2048 lock_guard<mutex> lock(card_mutex);
2049 ycbcr_interpretation[card_index] = interpretation;
2052 void Mixer::start_mode_scanning(unsigned card_index)
2054 assert(card_index < MAX_VIDEO_CARDS);
2055 if (cards[card_index].capture != nullptr) {
2056 // Inactive card. Should never happen.
2059 if (is_mode_scanning[card_index]) {
2062 is_mode_scanning[card_index] = true;
2063 mode_scanlist[card_index].clear();
2064 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
2065 mode_scanlist[card_index].push_back(mode.first);
2067 assert(!mode_scanlist[card_index].empty());
2068 mode_scanlist_index[card_index] = 0;
2069 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
2070 last_mode_scan_change[card_index] = steady_clock::now();
2073 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
2075 assert(desired_output_card_index != -1);
2076 lock_guard<mutex> lock(card_mutex);
2077 return cards[desired_output_card_index].output->get_available_video_modes();
2080 string Mixer::get_ffmpeg_filename(unsigned card_index) const
2082 assert(card_index < MAX_VIDEO_CARDS);
2083 assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2084 return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
2087 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
2088 assert(card_index < MAX_VIDEO_CARDS);
2089 assert(cards[card_index].type == CardType::FFMPEG_INPUT);
2090 ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
2093 void Mixer::wait_for_next_frame()
2095 unique_lock<mutex> lock(frame_num_mutex);
2096 unsigned old_frame_num = frame_num;
2097 frame_num_updated.wait_for(lock, seconds(1), // Timeout is just in case.
2098 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
2101 Mixer::OutputChannel::~OutputChannel()
2103 if (has_current_frame) {
2104 parent->release_display_frame(¤t_frame);
2106 if (has_ready_frame) {
2107 parent->release_display_frame(&ready_frame);
2111 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
2113 // Store this frame for display. Remove the ready frame if any
2114 // (it was seemingly never used).
2116 lock_guard<mutex> lock(frame_mutex);
2117 if (has_ready_frame) {
2118 parent->release_display_frame(&ready_frame);
2120 ready_frame = move(frame);
2121 has_ready_frame = true;
2123 // Call the callbacks under the mutex (they should be short),
2124 // so that we don't race against a callback removal.
2125 for (const auto &key_and_callback : new_frame_ready_callbacks) {
2126 key_and_callback.second();
2130 // Reduce the number of callbacks by filtering duplicates. The reason
2131 // why we bother doing this is that Qt seemingly can get into a state
2132 // where its builds up an essentially unbounded queue of signals,
2133 // consuming more and more memory, and there's no good way of collapsing
2134 // user-defined signals or limiting the length of the queue.
2135 if (transition_names_updated_callback) {
2136 vector<string> transition_names = global_mixer->get_transition_names();
2137 bool changed = false;
2138 if (transition_names.size() != last_transition_names.size()) {
2141 for (unsigned i = 0; i < transition_names.size(); ++i) {
2142 if (transition_names[i] != last_transition_names[i]) {
2149 transition_names_updated_callback(transition_names);
2150 last_transition_names = transition_names;
2153 if (name_updated_callback) {
2154 string name = global_mixer->get_channel_name(channel);
2155 if (name != last_name) {
2156 name_updated_callback(name);
2160 if (color_updated_callback) {
2161 string color = global_mixer->get_channel_color(channel);
2162 if (color != last_color) {
2163 color_updated_callback(color);
2169 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
2171 lock_guard<mutex> lock(frame_mutex);
2172 if (!has_current_frame && !has_ready_frame) {
2176 if (has_current_frame && has_ready_frame) {
2177 // We have a new ready frame. Toss the current one.
2178 parent->release_display_frame(¤t_frame);
2179 has_current_frame = false;
2181 if (has_ready_frame) {
2182 assert(!has_current_frame);
2183 current_frame = move(ready_frame);
2184 ready_frame.ready_fence.reset(); // Drop the refcount.
2185 ready_frame.input_frames.clear(); // Drop the refcounts.
2186 has_current_frame = true;
2187 has_ready_frame = false;
2190 *frame = current_frame;
2194 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
2196 lock_guard<mutex> lock(frame_mutex);
2197 new_frame_ready_callbacks[key] = callback;
2200 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
2202 lock_guard<mutex> lock(frame_mutex);
2203 new_frame_ready_callbacks.erase(key);
2206 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
2208 transition_names_updated_callback = callback;
2211 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
2213 name_updated_callback = callback;
2216 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
2218 color_updated_callback = callback;
2222 void Mixer::start_srt()
2224 SRTSOCKET sock = srt_create_socket();
2226 memset(&addr, 0, sizeof(addr));
2227 addr.sin6_family = AF_INET6;
2228 addr.sin6_port = htons(global_flags.srt_port);
2230 int err = srt_bind(sock, (sockaddr *)&addr, sizeof(addr));
2232 fprintf(stderr, "srt_bind: %s\n", srt_getlasterror_str());
2235 err = srt_listen(sock, MAX_VIDEO_CARDS);
2237 fprintf(stderr, "srt_listen: %s\n", srt_getlasterror_str());
2241 srt_thread = thread([this, sock] {
2244 int sa_len = sizeof(addr);
2245 int clientsock = srt_accept(sock, (sockaddr *)&addr, &sa_len);
2247 if (clientsock != -1) {
2248 srt_close(clientsock);
2252 if (!global_flags.enable_srt) { // Runtime UI toggle.
2253 // Perhaps not as good as never listening in the first place,
2254 // but much simpler to turn on and off.
2255 srt_close(clientsock);
2258 lock_guard<mutex> lock(hotplug_mutex);
2259 hotplugged_srt_cards.push_back(clientsock);
2267 void Mixer::update_srt_stats(int srt_sock, Mixer::CaptureCard *card)
2269 SRT_TRACEBSTATS stats;
2270 srt_bistats(srt_sock, &stats, /*clear=*/0, /*instantaneous=*/1);
2272 card->metric_srt_uptime_seconds = stats.msTimeStamp * 1e-3;
2273 card->metric_srt_send_duration_seconds = stats.usSndDurationTotal * 1e-6;
2274 card->metric_srt_sent_bytes = stats.byteSentTotal;
2275 card->metric_srt_received_bytes = stats.byteRecvTotal;
2276 card->metric_srt_sent_packets_normal = stats.pktSentTotal;
2277 card->metric_srt_received_packets_normal = stats.pktRecvTotal;
2278 card->metric_srt_sent_packets_lost = stats.pktSndLossTotal;
2279 card->metric_srt_received_packets_lost = stats.pktRcvLossTotal;
2280 card->metric_srt_sent_packets_retransmitted = stats.pktRetransTotal;
2281 card->metric_srt_sent_bytes_retransmitted = stats.byteRetransTotal;
2282 card->metric_srt_sent_packets_ack = stats.pktSentACKTotal;
2283 card->metric_srt_received_packets_ack = stats.pktRecvACKTotal;
2284 card->metric_srt_sent_packets_nak = stats.pktSentNAKTotal;
2285 card->metric_srt_received_packets_nak = stats.pktRecvNAKTotal;
2286 card->metric_srt_sent_packets_dropped = stats.pktSndDropTotal;
2287 card->metric_srt_received_packets_dropped = stats.pktRcvDropTotal;
2288 card->metric_srt_sent_bytes_dropped = stats.byteSndDropTotal;
2289 card->metric_srt_received_bytes_dropped = stats.byteRcvDropTotal;
2290 card->metric_srt_received_packets_undecryptable = stats.pktRcvUndecryptTotal;
2291 card->metric_srt_received_bytes_undecryptable = stats.byteRcvUndecryptTotal;
2292 card->metric_srt_filter_sent_packets = stats.pktSndFilterExtraTotal;
2293 card->metric_srt_filter_received_extra_packets = stats.pktRcvFilterExtraTotal;
2294 card->metric_srt_filter_received_rebuilt_packets = stats.pktRcvFilterSupplyTotal;
2295 card->metric_srt_filter_received_lost_packets = stats.pktRcvFilterLossTotal;
2298 card->metric_srt_packet_sending_period_seconds = stats.usPktSndPeriod * 1e-6;
2299 card->metric_srt_flow_window_packets = stats.pktFlowWindow;
2300 card->metric_srt_congestion_window_packets = stats.pktCongestionWindow;
2301 card->metric_srt_flight_size_packets = stats.pktFlightSize;
2302 card->metric_srt_rtt_seconds = stats.msRTT * 1e-3;
2303 card->metric_srt_estimated_bandwidth_bits_per_second = stats.mbpsBandwidth * 1e6;
2304 card->metric_srt_bandwidth_ceiling_bits_per_second = stats.mbpsMaxBW * 1e6;
2305 card->metric_srt_send_buffer_available_bytes = stats.byteAvailSndBuf;
2306 card->metric_srt_receive_buffer_available_bytes = stats.byteAvailRcvBuf;
2307 card->metric_srt_mss_bytes = stats.byteMSS;
2308 card->metric_srt_sender_unacked_packets = stats.pktSndBuf;
2309 card->metric_srt_sender_unacked_bytes = stats.byteSndBuf;
2310 card->metric_srt_sender_unacked_timespan_seconds = stats.msSndBuf * 1e-3;
2311 card->metric_srt_sender_delivery_delay_seconds = stats.msSndTsbPdDelay * 1e-3;
2312 card->metric_srt_receiver_unacked_packets = stats.pktRcvBuf;
2313 card->metric_srt_receiver_unacked_bytes = stats.byteRcvBuf;
2314 card->metric_srt_receiver_unacked_timespan_seconds = stats.msRcvBuf * 1e-3;
2315 card->metric_srt_receiver_delivery_delay_seconds = stats.msRcvTsbPdDelay * 1e-3;
2319 string Mixer::description_for_card(unsigned card_index)
2321 CaptureCard *card = &cards[card_index];
2322 if (card->capture == nullptr) {
2323 // Should never be called for inactive cards, but OK.
2325 snprintf(buf, sizeof(buf), "Inactive capture card %u", card_index);
2328 if (card->type != CardType::FFMPEG_INPUT) {
2330 snprintf(buf, sizeof(buf), "Capture card %u (%s)", card_index, card->capture->get_description().c_str());
2334 // Number (non-SRT) FFmpeg inputs from zero, separately from the capture cards,
2335 // since it's not too obvious for the user that they are “cards”.
2336 unsigned ffmpeg_index = 0;
2337 for (unsigned i = 0; i < card_index; ++i) {
2338 CaptureCard *other_card = &cards[i];
2339 if (other_card->type == CardType::FFMPEG_INPUT && !is_srt_card(other_card)) {
2344 snprintf(buf, sizeof(buf), "Video input %u (%s)", ffmpeg_index, card->capture->get_description().c_str());
2348 bool Mixer::is_srt_card(const Mixer::CaptureCard *card)
2351 if (card->type == CardType::FFMPEG_INPUT) {
2352 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
2353 return srt_sock != -1;
2359 mutex RefCountedGLsync::fence_lock;