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.bit_depth > 8 &&
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)
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 if (expected_timestamp > steady_clock::time_point::min()) {
248 expected_timestamp += dropped_frames * nanoseconds(frame_duration * 1000000000 / TIMEBASE);
249 double jitter_seconds = fabs(duration<double>(expected_timestamp - now).count());
250 history.push_back(orders.insert(jitter_seconds));
251 if (jitter_seconds > estimate_max_jitter()) {
252 ++metric_input_underestimated_jitter_frames;
255 metric_input_estimated_max_jitter_seconds = estimate_max_jitter();
257 if (history.size() > history_length) {
258 orders.erase(history.front());
261 assert(history.size() <= history_length);
263 expected_timestamp = now + nanoseconds(frame_duration * 1000000000 / TIMEBASE);
266 double JitterHistory::estimate_max_jitter() const
268 if (orders.empty()) {
271 size_t elem_idx = lrint((orders.size() - 1) * percentile);
272 if (percentile <= 0.5) {
273 return *next(orders.begin(), elem_idx) * multiplier;
275 return *prev(orders.end(), orders.size() - elem_idx) * multiplier;
279 void QueueLengthPolicy::register_metrics(const vector<pair<string, string>> &labels)
281 global_metrics.add("input_queue_safe_length_frames", labels, &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
284 void QueueLengthPolicy::unregister_metrics(const vector<pair<string, string>> &labels)
286 global_metrics.remove("input_queue_safe_length_frames", labels);
289 void QueueLengthPolicy::update_policy(steady_clock::time_point now,
290 steady_clock::time_point expected_next_input_frame,
291 int64_t input_frame_duration,
292 int64_t master_frame_duration,
293 double max_input_card_jitter_seconds,
294 double max_master_card_jitter_seconds)
296 double input_frame_duration_seconds = input_frame_duration / double(TIMEBASE);
297 double master_frame_duration_seconds = master_frame_duration / double(TIMEBASE);
299 // Figure out when we can expect the next frame for this card, assuming
300 // worst-case jitter (ie., the frame is maximally late).
301 double seconds_until_next_frame = max(duration<double>(expected_next_input_frame - now).count() + max_input_card_jitter_seconds, 0.0);
303 // How many times are the master card expected to tick in that time?
304 // We assume the master clock has worst-case jitter but not any rate
305 // discrepancy, ie., it ticks as early as possible every time, but not
307 double frames_needed = (seconds_until_next_frame + max_master_card_jitter_seconds) / master_frame_duration_seconds;
309 // As a special case, if the master card ticks faster than the input card,
310 // we expect the queue to drain by itself even without dropping. But if
311 // the difference is small (e.g. 60 Hz master and 59.94 input), it would
312 // go slowly enough that the effect wouldn't really be appreciable.
313 // We account for this by looking at the situation five frames ahead,
314 // assuming everything else is the same.
315 double frames_allowed;
316 if (master_frame_duration < input_frame_duration) {
317 frames_allowed = frames_needed + 5 * (input_frame_duration_seconds - master_frame_duration_seconds) / master_frame_duration_seconds;
319 frames_allowed = frames_needed;
322 safe_queue_length = max<int>(floor(frames_allowed), 0);
323 metric_input_queue_safe_length_frames = safe_queue_length;
326 Mixer::Mixer(const QSurfaceFormat &format)
328 mixer_surface(create_surface(format)),
329 h264_encoder_surface(create_surface(format)),
330 decklink_output_surface(create_surface(format)),
331 image_update_surface(create_surface(format))
333 memcpy(ycbcr_interpretation, global_flags.ycbcr_interpretation, sizeof(ycbcr_interpretation));
334 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
337 if (!epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") ||
338 !epoxy_has_gl_extension("GL_ARB_sampler_objects")) {
339 fprintf(stderr, "Nageru requires GL_EXT_texture_sRGB_decode and GL_ARB_sampler_objects to run.\n");
343 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
344 // will be halved when sampling them, and we need to compensate here.
345 movit_texel_subpixel_precision /= 2.0;
347 resource_pool.reset(new ResourcePool);
348 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
349 output_channel[i].parent = this;
350 output_channel[i].channel = i;
353 ImageFormat inout_format;
354 inout_format.color_space = COLORSPACE_sRGB;
355 inout_format.gamma_curve = GAMMA_sRGB;
357 // Matches the 4:2:0 format created by the main chain.
358 YCbCrFormat ycbcr_format;
359 ycbcr_format.chroma_subsampling_x = 2;
360 ycbcr_format.chroma_subsampling_y = 2;
361 if (global_flags.ycbcr_rec709_coefficients) {
362 ycbcr_format.luma_coefficients = YCBCR_REC_709;
364 ycbcr_format.luma_coefficients = YCBCR_REC_601;
366 ycbcr_format.full_range = false;
367 ycbcr_format.num_levels = 1 << global_flags.bit_depth;
368 ycbcr_format.cb_x_position = 0.0f;
369 ycbcr_format.cr_x_position = 0.0f;
370 ycbcr_format.cb_y_position = 0.5f;
371 ycbcr_format.cr_y_position = 0.5f;
373 // Initialize the neutral colors to sane values.
374 for (unsigned i = 0; i < MAX_VIDEO_CARDS; ++i) {
375 last_received_neutral_color[i] = RGBTriplet(1.0f, 1.0f, 1.0f);
378 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
379 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
381 GLenum type = global_flags.bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
382 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
383 display_chain->add_input(display_input);
384 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
385 display_chain->set_dither_bits(0); // Don't bother.
386 display_chain->finalize();
388 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));
389 if (!global_flags.card_to_mjpeg_stream_export.empty()) {
390 mjpeg_encoder.reset(new MJPEGEncoder(&httpd, global_flags.va_display));
393 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
394 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get()));
396 // Must be instantiated after the theme, as the theme decides the number of FFmpeg inputs.
397 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
398 audio_mixer.reset(new AudioMixer);
400 httpd.add_endpoint("/channels", bind(&Mixer::get_channels_json, this), HTTPD::ALLOW_ALL_ORIGINS);
401 for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
403 snprintf(url, sizeof(url), "/channels/%d/color", channel_idx + 2);
404 httpd.add_endpoint(url, bind(&Mixer::get_channel_color_http, this, unsigned(channel_idx + 2)), HTTPD::ALLOW_ALL_ORIGINS);
407 // Start listening for clients only once VideoEncoder has written its header, if any.
408 httpd.start(global_flags.http_port);
410 // First try initializing the then PCI devices, then USB, then
411 // fill up with fake cards until we have the desired number of cards.
412 unsigned num_pci_devices = 0;
413 unsigned card_index = 0;
416 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
417 if (decklink_iterator != nullptr) {
418 for ( ; card_index < unsigned(global_flags.max_num_cards); ++card_index) {
420 if (decklink_iterator->Next(&decklink) != S_OK) {
424 if (!decklink_card_is_active(decklink, card_index)) {
425 fprintf(stderr, "DeckLink card %u is inactive in current profile, skipping (try changing it in Desktop Video Setup)\n", card_index);
430 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
431 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
432 if (!output->set_device(decklink, capture->get_input())) {
436 configure_card(card_index, capture, CardType::LIVE_CARD, output, /*is_srt_card=*/false);
439 decklink_iterator->Release();
440 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
442 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
446 unsigned num_usb_devices = BMUSBCapture::num_cards();
447 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) {
448 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
449 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
450 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
452 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
454 // Fill up with fake cards for as long as we can, so that the FFmpeg
455 // and HTML cards always come last.
456 unsigned num_fake_cards = 0;
458 size_t num_html_inputs = theme->get_html_inputs().size();
460 size_t num_html_inputs = 0;
462 for ( ; card_index < MAX_VIDEO_CARDS - video_inputs.size() - num_html_inputs; ++card_index) {
463 // Only bother to activate fake capture cards to satisfy the minimum.
464 bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
466 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
467 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
470 configure_card(card_index, nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
474 if (num_fake_cards > 0) {
475 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
478 // Initialize all video inputs the theme asked for.
479 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
480 if (card_index >= MAX_VIDEO_CARDS) {
481 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
484 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
485 video_inputs[video_card_index]->set_card_index(card_index);
487 num_video_inputs = video_inputs.size();
490 // Same, for HTML inputs.
491 std::vector<CEFCapture *> html_inputs = theme->get_html_inputs();
492 for (unsigned html_card_index = 0; html_card_index < html_inputs.size(); ++card_index, ++html_card_index) {
493 if (card_index >= MAX_VIDEO_CARDS) {
494 fprintf(stderr, "ERROR: Not enough card slots available for the HTML inputs the theme requested.\n");
497 configure_card(card_index, html_inputs[html_card_index], CardType::CEF_INPUT, /*output=*/nullptr, /*is_srt_card=*/false);
498 html_inputs[html_card_index]->set_card_index(card_index);
500 num_html_inputs = html_inputs.size();
503 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
504 BMUSBCapture::start_bm_thread();
507 if (global_flags.srt_port >= 0) {
512 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
514 if (global_flags.bit_depth > 8) {
515 if (!v210Converter::has_hardware_support()) {
516 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
517 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
520 v210_converter.reset(new v210Converter());
522 // These are all the widths listed in the Blackmagic SDK documentation
523 // (section 2.7.3, “Display Modes”).
524 v210_converter->precompile_shader(720);
525 v210_converter->precompile_shader(1280);
526 v210_converter->precompile_shader(1920);
527 v210_converter->precompile_shader(2048);
528 v210_converter->precompile_shader(3840);
529 v210_converter->precompile_shader(4096);
531 if (global_flags.bit_depth > 8) {
532 if (!v210Converter::has_hardware_support()) {
533 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
534 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
539 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
540 display_timecode_in_stream = global_flags.display_timecode_in_stream;
541 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
543 if (global_flags.enable_alsa_output) {
544 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
546 output_card_is_master = global_flags.output_card_is_master;
547 if (global_flags.output_card != -1) {
548 desired_output_card_index = global_flags.output_card;
549 set_output_card_internal(global_flags.output_card);
552 output_jitter_history.register_metrics({{ "card", "output" }});
554 ImageInput::start_update_thread(image_update_surface);
559 ImageInput::end_update_thread();
561 if (mjpeg_encoder != nullptr) {
562 mjpeg_encoder->stop();
565 BMUSBCapture::stop_bm_thread();
567 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
568 if (cards[card_index].capture != nullptr) { // Active.
569 cards[card_index].capture->stop_dequeue_thread();
571 if (cards[card_index].output) {
572 cards[card_index].output->end_output();
573 cards[card_index].output.reset();
577 video_encoder.reset(nullptr);
580 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output, bool is_srt_card)
582 bool is_active = capture != nullptr;
584 printf("Configuring card %d...\n", card_index);
586 assert(card_type == CardType::FAKE_CAPTURE);
589 CaptureCard *card = &cards[card_index];
590 if (card->capture != nullptr) {
591 card_mutex.unlock(); // The dequeue thread could be waiting for bm_frame().
592 card->capture->stop_dequeue_thread();
595 card->capture.reset(capture);
596 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
597 if (card->is_fake_capture) {
598 card->fake_capture_counter = fake_capture_counter++;
600 card->is_cef_capture = (card_type == CardType::CEF_INPUT);
601 card->may_have_dropped_last_frame = false;
602 card->type = card_type;
603 if (card->output.get() != output) {
604 card->output.reset(output);
607 PixelFormat pixel_format;
608 if (card_type == CardType::FFMPEG_INPUT) {
609 pixel_format = capture->get_current_pixel_format();
610 } else if (card_type == CardType::CEF_INPUT) {
611 pixel_format = PixelFormat_8BitBGRA;
612 } else if (global_flags.bit_depth > 8) {
613 pixel_format = PixelFormat_10BitYCbCr;
615 pixel_format = PixelFormat_8BitYCbCr;
619 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
620 if (card->frame_allocator == nullptr) {
621 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, FRAME_SIZE, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get()));
623 // The format could have changed, but we cannot reset the allocator
624 // and create a new one from scratch, since there may be allocated
625 // frames from it that expect to call release_frame() on it.
626 // Instead, ask the allocator to create new frames for us and discard
627 // any old ones as they come back. This takes the mutex while
628 // allocating, but nothing should really be sending frames in there
629 // right now anyway (start_bm_capture() has not been called yet).
630 card->frame_allocator->reconfigure(pixel_format, FRAME_SIZE, global_flags.width, global_flags.height, card_index, mjpeg_encoder.get());
632 card->capture->set_video_frame_allocator(card->frame_allocator.get());
633 if (card->surface == nullptr) {
634 card->surface = create_surface_with_same_format(mixer_surface);
636 while (!card->new_frames.empty()) card->new_frames.pop_front();
637 card->last_timecode = -1;
638 card->capture->set_pixel_format(pixel_format);
639 card->capture->configure_card();
641 // NOTE: start_bm_capture() happens in thread_func().
645 assert(card_type == CardType::FFMPEG_INPUT);
648 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
649 unsigned num_channels = card_type == CardType::LIVE_CARD ? 8 : 2;
651 audio_mixer->set_device_parameters(device, card->capture->get_description(), card_type, num_channels, /*active=*/true);
653 // Note: Keeps the previous name, if any.
655 snprintf(name, sizeof(name), "Fake card %u", card_index + 1);
656 audio_mixer->set_device_parameters(device, name, card_type, num_channels, /*active=*/false);
658 audio_mixer->reset_resampler(device);
659 audio_mixer->trigger_state_changed_callback();
661 // Unregister old metrics, if any.
662 if (!card->labels.empty()) {
663 const vector<pair<string, string>> &labels = card->labels;
664 card->jitter_history.unregister_metrics(labels);
665 card->queue_length_policy.unregister_metrics(labels);
666 global_metrics.remove_if_exists("input_received_frames", labels);
667 global_metrics.remove_if_exists("input_dropped_frames_jitter", labels);
668 global_metrics.remove_if_exists("input_dropped_frames_error", labels);
669 global_metrics.remove_if_exists("input_dropped_frames_resets", labels);
670 global_metrics.remove_if_exists("input_queue_length_frames", labels);
671 global_metrics.remove_if_exists("input_queue_duped_frames", labels);
673 global_metrics.remove_if_exists("input_has_signal_bool", labels);
674 global_metrics.remove_if_exists("input_is_connected_bool", labels);
675 global_metrics.remove_if_exists("input_interlaced_bool", labels);
676 global_metrics.remove_if_exists("input_width_pixels", labels);
677 global_metrics.remove_if_exists("input_height_pixels", labels);
678 global_metrics.remove_if_exists("input_frame_rate_nom", labels);
679 global_metrics.remove_if_exists("input_frame_rate_den", labels);
680 global_metrics.remove_if_exists("input_sample_rate_hz", labels);
682 card->srt_metrics.deinit(labels);
687 vector<pair<string, string>> labels;
689 snprintf(card_name, sizeof(card_name), "%d", card_index);
690 labels.emplace_back("card", card_name);
693 case CardType::LIVE_CARD:
694 labels.emplace_back("cardtype", "live");
696 case CardType::FAKE_CAPTURE:
697 labels.emplace_back("cardtype", "fake");
699 case CardType::FFMPEG_INPUT:
701 labels.emplace_back("cardtype", "srt");
703 labels.emplace_back("cardtype", "ffmpeg");
706 case CardType::CEF_INPUT:
707 labels.emplace_back("cardtype", "cef");
712 card->jitter_history.register_metrics(labels);
713 card->queue_length_policy.register_metrics(labels);
714 global_metrics.add("input_received_frames", labels, &card->metric_input_received_frames);
715 global_metrics.add("input_dropped_frames_jitter", labels, &card->metric_input_dropped_frames_jitter);
716 global_metrics.add("input_dropped_frames_error", labels, &card->metric_input_dropped_frames_error);
717 global_metrics.add("input_dropped_frames_resets", labels, &card->metric_input_resets);
718 global_metrics.add("input_queue_length_frames", labels, &card->metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
719 global_metrics.add("input_queue_duped_frames", labels, &card->metric_input_duped_frames);
721 global_metrics.add("input_has_signal_bool", labels, &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
722 global_metrics.add("input_is_connected_bool", labels, &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
723 global_metrics.add("input_interlaced_bool", labels, &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
724 global_metrics.add("input_width_pixels", labels, &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
725 global_metrics.add("input_height_pixels", labels, &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
726 global_metrics.add("input_frame_rate_nom", labels, &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
727 global_metrics.add("input_frame_rate_den", labels, &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
728 global_metrics.add("input_sample_rate_hz", labels, &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
731 card->srt_metrics.init(labels);
734 card->labels = labels;
736 card->labels.clear();
740 void Mixer::set_output_card_internal(int card_index)
742 // We don't really need to take card_mutex, since we're in the mixer
743 // thread and don't mess with any queues (which is the only thing that happens
744 // from other threads), but it's probably the safest in the long run.
745 unique_lock<mutex> lock(card_mutex);
746 if (output_card_index != -1) {
747 // Switch the old card from output to input.
748 CaptureCard *old_card = &cards[output_card_index];
749 old_card->output->end_output();
751 // Stop the fake card that we put into place.
752 // This needs to _not_ happen under the mutex, to avoid deadlock
753 // (delivering the last frame needs to take the mutex).
754 CaptureInterface *fake_capture = old_card->capture.get();
756 fake_capture->stop_dequeue_thread();
758 old_card->capture = move(old_card->parked_capture); // TODO: reset the metrics
759 old_card->is_fake_capture = false;
760 old_card->capture->start_bm_capture();
762 if (card_index != -1) {
763 CaptureCard *card = &cards[card_index];
764 CaptureInterface *capture = card->capture.get();
765 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
766 // several seconds to complete (blocking on DisableVideoInput);
767 // see if we can maybe do it asynchronously.
769 capture->stop_dequeue_thread();
771 card->parked_capture = move(card->capture);
772 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
773 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release(), /*is_srt_card=*/false);
774 card->jitter_history.clear();
775 card->capture->start_bm_capture();
776 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
777 card->output->start_output(desired_output_video_mode, pts_int, /*is_master_card=*/output_card_is_master);
779 output_card_index = card_index;
780 output_jitter_history.clear();
785 int unwrap_timecode(uint16_t current_wrapped, int last)
787 uint16_t last_wrapped = last & 0xffff;
788 if (current_wrapped > last_wrapped) {
789 return (last & ~0xffff) | current_wrapped;
791 return 0x10000 + ((last & ~0xffff) | current_wrapped);
797 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
798 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
799 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
801 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
802 CaptureCard *card = &cards[card_index];
804 ++card->metric_input_received_frames;
805 card->metric_input_has_signal_bool = video_format.has_signal;
806 card->metric_input_is_connected_bool = video_format.is_connected;
807 card->metric_input_interlaced_bool = video_format.interlaced;
808 card->metric_input_width_pixels = video_format.width;
809 card->metric_input_height_pixels = video_format.height;
810 card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
811 card->metric_input_frame_rate_den = video_format.frame_rate_den;
812 card->metric_input_sample_rate_hz = audio_format.sample_rate;
814 if (is_mode_scanning[card_index]) {
815 if (video_format.has_signal) {
816 // Found a stable signal, so stop scanning.
817 is_mode_scanning[card_index] = false;
819 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
820 steady_clock::time_point now = steady_clock::now();
821 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
822 if (sec_since_last_switch > switch_time_s) {
823 // It isn't this mode; try the next one.
824 mode_scanlist_index[card_index]++;
825 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
826 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
827 last_mode_scan_change[card_index] = now;
832 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
833 assert(frame_length > 0);
835 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;
836 if (num_samples > OUTPUT_FREQUENCY / 10 && card->type != CardType::FFMPEG_INPUT) {
837 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",
838 description_for_card(card_index).c_str(), int(audio_frame.len), int(audio_offset),
839 timecode, int(video_frame.len), int(video_offset), video_format.id);
840 if (video_frame.owner) {
841 video_frame.owner->release_frame(video_frame);
843 if (audio_frame.owner) {
844 audio_frame.owner->release_frame(audio_frame);
849 int dropped_frames = 0;
850 if (card->last_timecode != -1) {
851 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
854 // Number of samples per frame if we need to insert silence.
855 // (Could be nonintegral, but resampling will save us then.)
856 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
858 if (dropped_frames > TYPICAL_FPS * 2) {
859 fprintf(stderr, "%s lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
860 description_for_card(card_index).c_str(), card->last_timecode, timecode);
861 audio_mixer->reset_resampler(device);
863 ++card->metric_input_resets;
864 } else if (dropped_frames > 0) {
865 // Insert silence as needed.
866 fprintf(stderr, "%s dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
867 description_for_card(card_index).c_str(), dropped_frames, timecode);
868 card->metric_input_dropped_frames_error += dropped_frames;
872 success = audio_mixer->add_silence(device, silence_samples, dropped_frames);
876 if (num_samples > 0) {
877 audio_mixer->add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, audio_frame.received_timestamp);
879 // Audio for the MJPEG stream. We don't resample; audio that's not in 48 kHz
880 // just gets dropped for now.
882 // Only bother doing MJPEG encoding if there are any connected clients
883 // that want the stream.
884 if (httpd.get_num_connected_multicam_clients() > 0 ||
885 httpd.get_num_connected_siphon_clients(card_index) > 0) {
886 vector<int32_t> converted_samples = convert_audio_to_fixed32(audio_frame.data + audio_offset, num_samples, audio_format, 2);
887 lock_guard<mutex> lock(card_mutex);
888 if (card->new_raw_audio.empty()) {
889 card->new_raw_audio = move(converted_samples);
891 // For raw audio, we don't really synchronize audio and video;
892 // we just put the audio in frame by frame, and if a video frame is
893 // dropped, we still keep the audio, which means it will be added
894 // to the beginning of the next frame. It would probably be better
895 // to move the audio pts earlier to show this, but most players can
896 // live with some jitter, and in a lot of ways, it's much nicer for
897 // Futatabi to have all audio locked to a video frame.
898 card->new_raw_audio.insert(card->new_raw_audio.end(), converted_samples.begin(), converted_samples.end());
900 // Truncate to one second, just to be sure we don't have infinite buildup in case of weirdness.
901 if (card->new_raw_audio.size() > OUTPUT_FREQUENCY * 2) {
902 size_t excess_samples = card->new_raw_audio.size() - OUTPUT_FREQUENCY * 2;
903 card->new_raw_audio.erase(card->new_raw_audio.begin(), card->new_raw_audio.begin() + excess_samples);
909 // Done with the audio, so release it.
910 if (audio_frame.owner) {
911 audio_frame.owner->release_frame(audio_frame);
914 card->last_timecode = timecode;
916 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
917 if (card->type == CardType::FFMPEG_INPUT && userdata != nullptr) {
918 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
919 userdata->has_last_subtitle = ffmpeg_capture->get_has_last_subtitle();
920 userdata->last_subtitle = ffmpeg_capture->get_last_subtitle();
923 if (card->type == CardType::FFMPEG_INPUT) {
924 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
925 if (srt_sock != -1) {
926 card->srt_metrics.update_srt_stats(srt_sock);
931 size_t y_offset, cbcr_offset;
932 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
933 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
934 // The calculation above is wrong for planar Y'CbCr, so just override it.
935 assert(card->type == CardType::FFMPEG_INPUT);
936 assert(video_offset == 0);
937 expected_length = video_frame.len;
939 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
941 cbcr_offset = video_format.width * video_format.height;
943 // All the other Y'CbCr formats are 4:2:2.
944 y_offset = video_frame.size / 2 + video_offset / 2;
945 cbcr_offset = video_offset / 2;
947 if (video_frame.len - video_offset == 0 ||
948 video_frame.len - video_offset != expected_length) {
949 if (video_frame.len != 0) {
950 printf("%s: Dropping video frame with wrong length (%zu; expected %zu)\n",
951 description_for_card(card_index).c_str(), video_frame.len - video_offset, expected_length);
953 if (video_frame.owner) {
954 video_frame.owner->release_frame(video_frame);
957 // Still send on the information that we _had_ a frame, even though it's corrupted,
958 // so that pts can go up accordingly.
960 lock_guard<mutex> lock(card_mutex);
961 CaptureCard::NewFrame new_frame;
962 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
963 new_frame.length = frame_length;
964 new_frame.interlaced = false;
965 new_frame.dropped_frames = dropped_frames;
966 new_frame.received_timestamp = video_frame.received_timestamp;
967 card->new_frames.push_back(move(new_frame));
968 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
970 card->new_frames_changed.notify_all();
974 unsigned num_fields = video_format.interlaced ? 2 : 1;
975 steady_clock::time_point frame_upload_start;
976 if (video_format.interlaced) {
977 // Send the two fields along as separate frames; the other side will need to add
978 // a deinterlacer to actually get this right.
979 assert(video_format.height % 2 == 0);
980 video_format.height /= 2;
981 assert(frame_length % 2 == 0);
984 frame_upload_start = steady_clock::now();
986 assert(userdata != nullptr);
987 userdata->last_interlaced = video_format.interlaced;
988 userdata->last_has_signal = video_format.has_signal;
989 userdata->last_is_connected = video_format.is_connected;
990 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
991 userdata->last_frame_rate_den = video_format.frame_rate_den;
992 RefCountedFrame frame(video_frame);
994 // Send the frames on to the main thread, which will upload and process htem.
995 // It is entirely possible to upload them in the same thread (and it might even be
996 // faster, depending on the GPU and driver), but it appears to be trickling
997 // driver bugs very easily.
999 // Note that this means we must hold on to the actual frame data in <userdata>
1000 // until the upload is done, but we hold on to <frame> much longer than that
1001 // (in fact, all the way until we no longer use the texture in rendering).
1002 for (unsigned field = 0; field < num_fields; ++field) {
1004 // Don't upload the second field as fast as we can; wait until
1005 // the field time has approximately passed. (Otherwise, we could
1006 // get timing jitter against the other sources, and possibly also
1007 // against the video display, although the latter is not as critical.)
1008 // This requires our system clock to be reasonably close to the
1009 // video clock, but that's not an unreasonable assumption.
1010 steady_clock::time_point second_field_start = frame_upload_start +
1011 nanoseconds(frame_length * 1000000000 / TIMEBASE);
1012 this_thread::sleep_until(second_field_start);
1016 lock_guard<mutex> lock(card_mutex);
1017 CaptureCard::NewFrame new_frame;
1018 new_frame.frame = frame;
1019 new_frame.length = frame_length;
1020 new_frame.field = field;
1021 new_frame.interlaced = video_format.interlaced;
1022 new_frame.dropped_frames = dropped_frames;
1023 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
1024 new_frame.video_format = video_format;
1025 new_frame.video_offset = video_offset;
1026 new_frame.y_offset = y_offset;
1027 new_frame.cbcr_offset = cbcr_offset;
1028 new_frame.texture_uploaded = false;
1029 if (card->type == CardType::FFMPEG_INPUT) {
1030 FFmpegCapture *ffmpeg_capture = static_cast<FFmpegCapture *>(card->capture.get());
1031 new_frame.neutral_color = ffmpeg_capture->get_last_neutral_color();
1033 card->new_frames.push_back(move(new_frame));
1034 card->jitter_history.frame_arrived(video_frame.received_timestamp, frame_length, dropped_frames);
1035 card->may_have_dropped_last_frame = false;
1037 card->new_frames_changed.notify_all();
1041 void Mixer::upload_texture_for_frame(
1042 int field, bmusb::VideoFormat video_format,
1043 size_t y_offset, size_t cbcr_offset, size_t video_offset, PBOFrameAllocator::Userdata *userdata)
1045 size_t cbcr_width, cbcr_height;
1046 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
1047 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
1048 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
1050 // All the other Y'CbCr formats are 4:2:2.
1051 cbcr_width = video_format.width / 2;
1052 cbcr_height = video_format.height;
1055 bool interlaced_stride = video_format.interlaced && (video_format.second_field_start == 1);
1056 if (video_format.interlaced) {
1060 unsigned field_start_line;
1062 field_start_line = video_format.second_field_start;
1064 field_start_line = video_format.extra_lines_top;
1067 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
1068 size_t v210_width = video_format.stride / sizeof(uint32_t);
1069 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
1071 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
1074 switch (userdata->pixel_format) {
1075 case PixelFormat_10BitYCbCr: {
1076 size_t field_start = video_offset + video_format.stride * field_start_line;
1077 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);
1078 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
1081 case PixelFormat_8BitYCbCr: {
1082 size_t field_y_start = y_offset + video_format.width * field_start_line;
1083 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
1085 // Make up our own strides, since we are interleaving.
1086 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);
1087 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);
1090 case PixelFormat_8BitYCbCrPlanar: {
1091 assert(field_start_line == 0); // We don't really support interlaced here.
1092 size_t field_y_start = y_offset;
1093 size_t field_cb_start = cbcr_offset;
1094 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
1096 // Make up our own strides, since we are interleaving.
1097 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);
1098 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
1099 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
1102 case PixelFormat_8BitBGRA: {
1103 size_t field_start = video_offset + video_format.stride * field_start_line;
1104 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);
1105 // These could be asked to deliver mipmaps at any time.
1106 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
1108 glGenerateMipmap(GL_TEXTURE_2D);
1110 glBindTexture(GL_TEXTURE_2D, 0);
1118 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
1122 void Mixer::bm_hotplug_add(libusb_device *dev)
1124 lock_guard<mutex> lock(hotplug_mutex);
1125 hotplugged_cards.push_back(dev);
1128 void Mixer::bm_hotplug_remove(unsigned card_index)
1130 cards[card_index].new_frames_changed.notify_all();
1133 void Mixer::thread_func()
1135 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
1137 eglBindAPI(EGL_OPENGL_API);
1138 QOpenGLContext *context = create_context(mixer_surface);
1139 if (!make_current(context, mixer_surface)) {
1144 // Start the actual capture. (We don't want to do it before we're actually ready
1145 // to process output frames.)
1146 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1147 if (int(card_index) != output_card_index && cards[card_index].capture != nullptr) {
1148 cards[card_index].capture->start_bm_capture();
1152 BasicStats basic_stats(/*verbose=*/true, /*use_opengl=*/true);
1153 int stats_dropped_frames = 0;
1155 while (!should_quit) {
1156 if (desired_output_card_index != output_card_index) {
1157 set_output_card_internal(desired_output_card_index);
1159 if (output_card_index != -1 &&
1160 desired_output_video_mode != output_video_mode) {
1161 DeckLinkOutput *output = cards[output_card_index].output.get();
1162 output->end_output();
1163 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
1164 output->start_output(desired_output_video_mode, pts_int, /*is_master_card=*/output_card_is_master);
1168 lock_guard<mutex> lock(card_mutex);
1169 handle_hotplugged_cards();
1172 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
1173 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
1175 bool master_card_is_output;
1176 unsigned master_card_index;
1177 if (output_card_index != -1 && output_card_is_master) {
1178 master_card_is_output = true;
1179 master_card_index = output_card_index;
1181 master_card_is_output = false;
1182 master_card_index = theme->map_signal_to_card(master_clock_channel);
1183 assert(master_card_index < MAX_VIDEO_CARDS);
1186 vector<int32_t> raw_audio[MAX_VIDEO_CARDS]; // For MJPEG encoding.
1187 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame, raw_audio);
1188 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);
1189 stats_dropped_frames += output_frame_info.dropped_frames;
1191 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1192 if (card_index == master_card_index || !has_new_frame[card_index]) {
1195 if (new_frames[card_index].frame->len == 0) {
1196 ++new_frames[card_index].dropped_frames;
1198 if (new_frames[card_index].dropped_frames > 0) {
1199 printf("%s dropped %d frames before this\n",
1200 description_for_card(card_index).c_str(), int(new_frames[card_index].dropped_frames));
1204 // If the first card is reporting a corrupted or otherwise dropped frame,
1205 // just increase the pts (skipping over this frame) and don't try to compute anything new.
1206 if (!master_card_is_output &&
1207 new_frames[master_card_index].frame != nullptr && // Timeout.
1208 new_frames[master_card_index].frame->len == 0) {
1209 ++stats_dropped_frames;
1210 pts_int += new_frames[master_card_index].length;
1214 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1215 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
1218 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
1219 assert(new_frame->frame != nullptr);
1220 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
1223 // The new texture might need uploading before use.
1224 if (!new_frame->texture_uploaded) {
1225 upload_texture_for_frame(new_frame->field, new_frame->video_format, new_frame->y_offset, new_frame->cbcr_offset,
1226 new_frame->video_offset, (PBOFrameAllocator::Userdata *)new_frame->frame->userdata);
1227 new_frame->texture_uploaded = true;
1230 // Only set the white balance if it actually changed. This means that the user
1231 // is free to override the white balance in a video with no white balance information
1232 // actually set (ie. r=g=b=1 all the time), or one where the white point is wrong,
1233 // but frame-to-frame decisions will be heeded. We do this pretty much as late
1234 // as possible (ie., after picking out the frame from the buffer), so that we are sure
1235 // that the change takes effect on exactly the right frame.
1236 if (fabs(new_frame->neutral_color.r - last_received_neutral_color[card_index].r) > 1e-3 ||
1237 fabs(new_frame->neutral_color.g - last_received_neutral_color[card_index].g) > 1e-3 ||
1238 fabs(new_frame->neutral_color.b - last_received_neutral_color[card_index].b) > 1e-3) {
1239 theme->set_wb_for_card(card_index, new_frame->neutral_color.r, new_frame->neutral_color.g, new_frame->neutral_color.b);
1240 last_received_neutral_color[card_index] = new_frame->neutral_color;
1243 if (new_frame->frame->data_copy != nullptr && mjpeg_encoder->should_encode_mjpeg_for_card(card_index)) {
1244 RGBTriplet neutral_color = theme->get_white_balance_for_card(card_index);
1245 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);
1250 int64_t frame_duration = output_frame_info.frame_duration;
1251 render_one_frame(frame_duration);
1253 lock_guard<mutex> lock(frame_num_mutex);
1256 frame_num_updated.notify_all();
1257 pts_int += frame_duration;
1259 basic_stats.update(frame_num, stats_dropped_frames);
1260 // if (frame_num % 100 == 0) chain->print_phase_timing();
1262 if (should_cut.exchange(false)) { // Test and clear.
1263 video_encoder->do_cut(frame_num);
1267 // Reset every 100 frames, so that local variations in frame times
1268 // (especially for the first few frames, when the shaders are
1269 // compiled etc.) don't make it hard to measure for the entire
1270 // remaining duration of the program.
1271 if (frame == 10000) {
1279 resource_pool->clean_context();
1282 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
1284 if (output_card_index != -1 && output_card_is_master) {
1285 // The output card (ie., cards[output_card_index].output) is the master clock,
1286 // so no input card (ie., cards[card_index].capture) is.
1289 return (card_index == master_card_index);
1292 void Mixer::trim_queue(CaptureCard *card, size_t safe_queue_length)
1294 // Count the number of frames in the queue, including any frames
1295 // we dropped. It's hard to know exactly how we should deal with
1296 // dropped (corrupted) input frames; they don't help our goal of
1297 // avoiding starvation, but they still add to the problem of latency.
1298 // Since dropped frames is going to mean a bump in the signal anyway,
1299 // we err on the side of having more stable latency instead.
1300 unsigned queue_length = 0;
1301 for (const CaptureCard::NewFrame &frame : card->new_frames) {
1302 queue_length += frame.dropped_frames + 1;
1305 // If needed, drop frames until the queue is below the safe limit.
1306 // We prefer to drop from the head, because all else being equal,
1307 // we'd like more recent frames (less latency).
1308 unsigned dropped_frames = 0;
1309 while (queue_length > safe_queue_length) {
1310 assert(!card->new_frames.empty());
1311 assert(queue_length > card->new_frames.front().dropped_frames);
1312 queue_length -= card->new_frames.front().dropped_frames;
1314 if (queue_length <= safe_queue_length) {
1315 // No need to drop anything.
1319 card->new_frames.pop_front();
1320 card->new_frames_changed.notify_all();
1324 if (queue_length == 0 && card->is_cef_capture) {
1325 card->may_have_dropped_last_frame = true;
1329 card->metric_input_dropped_frames_jitter += dropped_frames;
1330 card->metric_input_queue_length_frames = queue_length;
1333 if (dropped_frames > 0) {
1334 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1335 card_index, dropped_frames);
1340 pair<string, string> Mixer::get_channels_json()
1343 for (int channel_idx = 0; channel_idx < theme->get_num_channels(); ++channel_idx) {
1344 Channel *channel = ret.add_channel();
1345 channel->set_index(channel_idx + 2);
1346 channel->set_name(theme->get_channel_name(channel_idx + 2));
1347 channel->set_color(theme->get_channel_color(channel_idx + 2));
1350 google::protobuf::util::MessageToJsonString(ret, &contents); // Ignore any errors.
1351 return make_pair(contents, "text/json");
1354 pair<string, string> Mixer::get_channel_color_http(unsigned channel_idx)
1356 return make_pair(theme->get_channel_color(channel_idx), "text/plain");
1359 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])
1361 OutputFrameInfo output_frame_info;
1362 constexpr steady_clock::duration master_card_timeout = milliseconds(200);
1364 unique_lock<mutex> lock(card_mutex, defer_lock);
1365 bool timed_out = false;
1366 if (master_card_is_output) {
1367 // Clocked to the output, so wait for it to be ready for the next frame.
1368 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);
1371 // Wait for the master card to have a new frame.
1372 output_frame_info.is_preroll = false;
1374 timed_out = !cards[master_card_index].new_frames_changed.wait_for(lock,
1375 master_card_timeout,
1376 [this, master_card_index] {
1377 return !cards[master_card_index].new_frames.empty() ||
1378 cards[master_card_index].capture == nullptr ||
1379 cards[master_card_index].capture->get_disconnected();
1382 fprintf(stderr, "WARNING: Master card (%s) did not deliver a frame for %u ms, creating a fake one.\n",
1383 description_for_card(master_card_index).c_str(),
1384 unsigned(duration_cast<milliseconds>(master_card_timeout).count()));
1389 // The master card stalled for 200 ms (possible when it's e.g.
1390 // an SRT card). Send a frame no matter what; this also makes sure
1391 // any other cards get to empty their queues, and in general,
1392 // that we make _some_ sort of forward progress.
1393 handle_hotplugged_cards();
1394 } else if (master_card_is_output) {
1395 handle_hotplugged_cards();
1396 } else if (cards[master_card_index].new_frames.empty()) {
1397 // We were woken up, but not due to a new frame. Deal with it
1398 // and then restart.
1399 assert(cards[master_card_index].capture == nullptr ||
1400 cards[master_card_index].capture->get_disconnected());
1401 handle_hotplugged_cards();
1406 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1407 CaptureCard *card = &cards[card_index];
1408 if (card->new_frames.empty()) { // Starvation.
1409 ++card->metric_input_duped_frames;
1411 if (card->is_cef_capture && card->may_have_dropped_last_frame) {
1412 // Unlike other sources, CEF is not guaranteed to send us a steady
1413 // stream of frames, so we'll have to ask it to repaint the frame
1414 // we dropped. (may_have_dropped_last_frame is set whenever we
1415 // trim the queue completely away, and cleared when we actually
1416 // get a new frame.)
1417 ((CEFCapture *)card->capture.get())->request_new_frame(/*ignore_if_locked=*/true);
1421 new_frames[card_index] = move(card->new_frames.front());
1422 has_new_frame[card_index] = true;
1423 card->new_frames.pop_front();
1424 card->new_frames_changed.notify_all();
1427 raw_audio[card_index] = move(card->new_raw_audio);
1431 // Pretend the frame happened a while ago and was only processed now,
1432 // so that we get the duration sort-of right. This isn't ideal.
1433 output_frame_info.dropped_frames = 0; // Hard to define, really.
1434 output_frame_info.frame_duration = lrint(TIMEBASE * duration<double>(master_card_timeout).count());
1435 output_frame_info.frame_timestamp = steady_clock::now() - master_card_timeout;
1436 } else if (!master_card_is_output) {
1437 output_frame_info.frame_timestamp = new_frames[master_card_index].received_timestamp;
1438 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1439 output_frame_info.frame_duration = new_frames[master_card_index].length;
1442 if (!output_frame_info.is_preroll) {
1443 output_jitter_history.frame_arrived(output_frame_info.frame_timestamp, output_frame_info.frame_duration, output_frame_info.dropped_frames);
1446 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1447 CaptureCard *card = &cards[card_index];
1448 if (has_new_frame[card_index] &&
1449 !input_card_is_master_clock(card_index, master_card_index) &&
1450 !output_frame_info.is_preroll) {
1451 card->queue_length_policy.update_policy(
1452 output_frame_info.frame_timestamp,
1453 card->jitter_history.get_expected_next_frame(),
1454 new_frames[master_card_index].length,
1455 output_frame_info.frame_duration,
1456 card->jitter_history.estimate_max_jitter(),
1457 output_jitter_history.estimate_max_jitter());
1458 trim_queue(card, min<int>(global_flags.max_input_queue_frames,
1459 card->queue_length_policy.get_safe_queue_length()));
1463 // This might get off by a fractional sample when changing master card
1464 // between ones with different frame rates, but that's fine.
1465 int64_t num_samples_times_timebase = int64_t(OUTPUT_FREQUENCY) * output_frame_info.frame_duration + fractional_samples;
1466 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1467 fractional_samples = num_samples_times_timebase % TIMEBASE;
1468 assert(output_frame_info.num_samples >= 0);
1471 DeviceSpec device{InputSourceType::CAPTURE_CARD, master_card_index};
1474 success = audio_mixer->add_silence(device, output_frame_info.num_samples, /*dropped_frames=*/0);
1478 return output_frame_info;
1481 void Mixer::handle_hotplugged_cards()
1483 // Check for cards that have been disconnected since last frame.
1484 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1485 CaptureCard *card = &cards[card_index];
1486 if (card->capture != nullptr && card->capture->get_disconnected()) {
1487 bool is_active = card_index < unsigned(global_flags.min_num_cards) || cards[card_index].force_active;
1489 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1490 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1491 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1492 card->jitter_history.clear();
1493 card->capture->start_bm_capture();
1495 // NOTE: The theme might end up forcing the card back at some later point
1496 // (ie., force_active is false now, but might immediately be true again on
1497 // e.g. the next frame). That should be rare, though, so we don't bother
1498 // adjusting the message.
1499 fprintf(stderr, "Card %u went away, removing. (To keep a fake card, increase --num-cards.)\n", card_index);
1500 theme->remove_card(card_index);
1501 configure_card(card_index, /*capture=*/nullptr, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1502 card->jitter_history.clear();
1507 // Count how many active cards we already have. Used below to check that we
1508 // don't go past the max_cards limit set by the user. Note that (non-SRT) video
1509 // and HTML “cards” don't count towards this limit.
1510 int num_video_cards = 0;
1511 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1512 CaptureCard *card = &cards[card_index];
1513 if (card->type == CardType::LIVE_CARD || is_srt_card(card)) {
1518 // Check for cards that have been connected since last frame.
1519 vector<libusb_device *> hotplugged_cards_copy;
1521 vector<int> hotplugged_srt_cards_copy;
1524 lock_guard<mutex> lock(hotplug_mutex);
1525 swap(hotplugged_cards, hotplugged_cards_copy);
1527 swap(hotplugged_srt_cards, hotplugged_srt_cards_copy);
1530 for (libusb_device *new_dev : hotplugged_cards_copy) {
1531 // Look for a fake capture card where we can stick this in.
1532 int free_card_index = -1;
1533 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1534 if (cards[card_index].is_fake_capture) {
1535 free_card_index = card_index;
1540 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1541 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1542 libusb_unref_device(new_dev);
1544 // BMUSBCapture takes ownership.
1545 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1546 CaptureCard *card = &cards[free_card_index];
1547 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1548 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr, /*is_srt_card=*/false);
1549 card->jitter_history.clear();
1550 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1551 capture->start_bm_capture();
1556 // Same, for SRT inputs.
1557 for (SRTSOCKET sock : hotplugged_srt_cards_copy) {
1559 int namelen = sizeof(name);
1560 srt_getsockopt(sock, /*ignored=*/0, SRTO_STREAMID, name, &namelen);
1561 string stream_id(name, namelen);
1563 // Look for a fake capture card where we can stick this in.
1564 // Prioritize ones that previously held SRT streams with the
1565 // same stream ID, if any exist -- and it multiple exist,
1566 // take the one that disconnected the last.
1567 int first_free_card_index = -1, last_matching_free_card_index = -1;
1568 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1569 CaptureCard *card = &cards[card_index];
1570 if (!card->is_fake_capture) {
1573 if (first_free_card_index == -1) {
1574 first_free_card_index = card_index;
1576 if (card->last_srt_stream_id == stream_id &&
1577 (last_matching_free_card_index == -1 ||
1578 card->fake_capture_counter >
1579 cards[last_matching_free_card_index].fake_capture_counter)) {
1580 last_matching_free_card_index = card_index;
1584 const int free_card_index = (last_matching_free_card_index != -1)
1585 ? last_matching_free_card_index : first_free_card_index;
1586 if (free_card_index == -1 || num_video_cards >= global_flags.max_num_cards) {
1587 if (stream_id.empty()) {
1588 stream_id = "no name";
1590 fprintf(stderr, "New SRT stream connected (%s), but no free slots -- ignoring.\n", stream_id.c_str());
1593 // FFmpegCapture takes ownership.
1594 if (stream_id.empty()) {
1595 fprintf(stderr, "New unnamed SRT stream connected, choosing slot %d.\n", free_card_index);
1597 fprintf(stderr, "New SRT stream connected (%s), choosing slot %d.\n", stream_id.c_str(), free_card_index);
1599 CaptureCard *card = &cards[free_card_index];
1600 FFmpegCapture *capture = new FFmpegCapture(sock, stream_id);
1601 capture->set_card_index(free_card_index);
1602 configure_card(free_card_index, capture, CardType::FFMPEG_INPUT, /*output=*/nullptr, /*is_srt_card=*/true);
1603 card->srt_metrics.update_srt_stats(sock); // Initial zero stats.
1604 card->last_srt_stream_id = stream_id;
1605 card->jitter_history.clear();
1606 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1607 capture->start_bm_capture();
1612 // Finally, newly forced-to-active fake capture cards.
1613 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1614 CaptureCard *card = &cards[card_index];
1615 if (card->capture == nullptr && card->force_active) {
1616 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1617 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr, /*is_srt_card=*/false);
1618 card->jitter_history.clear();
1619 card->capture->start_bm_capture();
1625 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)
1627 // Resample the audio as needed, including from previously dropped frames.
1628 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1629 const bool dropped_frame = (frame_num != dropped_frames);
1631 // Signal to the audio thread to process this frame.
1632 // Note that if the frame is a dropped frame, we signal that
1633 // we don't want to use this frame as base for adjusting
1634 // the resampler rate. The reason for this is that the timing
1635 // of these frames is often way too late; they typically don't
1636 // “arrive” before we synthesize them. Thus, we could end up
1637 // in a situation where we have inserted e.g. five audio frames
1638 // into the queue before we then start pulling five of them
1639 // back out. This makes ResamplingQueue overestimate the delay,
1640 // causing undue resampler changes. (We _do_ use the last,
1641 // non-dropped frame; perhaps we should just discard that as well,
1642 // since dropped frames are expected to be rare, and it might be
1643 // better to just wait until we have a slightly more normal situation).
1644 lock_guard<mutex> lock(audio_mutex);
1645 bool adjust_rate = !dropped_frame && !is_preroll;
1646 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1647 audio_task_queue_changed.notify_one();
1649 if (dropped_frame) {
1650 // For dropped frames, increase the pts. Note that if the format changed
1651 // in the meantime, we have no way of detecting that; we just have to
1652 // assume the frame length is always the same.
1653 pts_int += length_per_frame;
1658 void Mixer::render_one_frame(int64_t duration)
1660 // Determine the time code for this frame before we start rendering.
1661 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1662 if (display_timecode_on_stdout) {
1663 printf("Timecode: '%s'\n", timecode_text.c_str());
1666 // Update Y'CbCr settings for all cards.
1668 lock_guard<mutex> lock(card_mutex);
1669 for (unsigned card_index = 0; card_index < MAX_VIDEO_CARDS; ++card_index) {
1670 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1671 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1672 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1673 input_state.full_range[card_index] = interpretation->full_range;
1677 // Get the main chain from the theme, and set its state immediately.
1678 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1679 EffectChain *chain = theme_main_chain.chain;
1680 theme_main_chain.setup_chain();
1681 //theme_main_chain.chain->enable_phase_timing(true);
1683 // If HDMI/SDI output is active and the user has requested auto mode,
1684 // its mode overrides the existing Y'CbCr setting for the chain.
1685 YCbCrLumaCoefficients ycbcr_output_coefficients;
1686 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1687 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1689 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1692 // TODO: Reduce the duplication against theme.cpp.
1693 YCbCrFormat output_ycbcr_format;
1694 output_ycbcr_format.chroma_subsampling_x = 1;
1695 output_ycbcr_format.chroma_subsampling_y = 1;
1696 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1697 output_ycbcr_format.full_range = false;
1698 output_ycbcr_format.num_levels = 1 << global_flags.bit_depth;
1699 chain->change_ycbcr_output_format(output_ycbcr_format);
1701 // Render main chain. If we're using zerocopy Quick Sync encoding
1702 // (the default case), we take an extra copy of the created outputs,
1703 // so that we can display it back to the screen later (it's less memory
1704 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1705 // Ideally, we'd like to avoid taking copies and just use the main textures
1706 // for display as well, but they're just views into VA-API memory and must be
1707 // unmapped during encoding, so we can't use them for display, unfortunately.
1708 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1709 GLuint y_copy_tex, cbcr_copy_tex = 0;
1710 GLuint y_display_tex, cbcr_display_tex;
1711 GLenum y_type = (global_flags.bit_depth > 8) ? GL_R16 : GL_R8;
1712 GLenum cbcr_type = (global_flags.bit_depth > 8) ? GL_RG16 : GL_RG8;
1713 const bool is_zerocopy = video_encoder->is_zerocopy();
1715 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1716 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1717 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1719 y_display_tex = y_copy_tex;
1720 cbcr_display_tex = cbcr_copy_tex;
1722 // y_tex and cbcr_tex will be given by VideoEncoder.
1724 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1725 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1726 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1728 y_display_tex = y_tex;
1729 cbcr_display_tex = cbcr_tex;
1732 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1733 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1738 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1740 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1743 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1745 if (display_timecode_in_stream) {
1746 // Render the timecode on top.
1747 timecode_renderer->render_timecode(fbo, timecode_text);
1750 resource_pool->release_fbo(fbo);
1753 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1755 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1757 if (output_card_index != -1) {
1758 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1760 resource_pool->release_2d_texture(cbcr_full_tex);
1762 // Set the right state for the Y' and CbCr textures we use for display.
1763 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1764 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1765 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1766 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1767 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1769 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1770 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1771 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1772 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1774 RefCountedGLsync fence = video_encoder->end_frame();
1776 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1777 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1778 DisplayFrame live_frame;
1779 live_frame.chain = display_chain.get();
1780 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1781 display_input->set_texture_num(0, y_display_tex);
1782 display_input->set_texture_num(1, cbcr_display_tex);
1784 live_frame.ready_fence = fence;
1785 live_frame.input_frames = {};
1786 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1787 output_channel[OUTPUT_LIVE].output_frame(move(live_frame));
1789 // Set up preview and any additional channels.
1790 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1791 DisplayFrame display_frame;
1792 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1793 display_frame.chain = move(chain.chain);
1794 display_frame.setup_chain = move(chain.setup_chain);
1795 display_frame.ready_fence = fence;
1796 display_frame.input_frames = move(chain.input_frames);
1797 display_frame.temp_textures = {};
1798 output_channel[i].output_frame(move(display_frame));
1802 void Mixer::audio_thread_func()
1804 pthread_setname_np(pthread_self(), "Mixer_Audio");
1806 while (!should_quit) {
1810 unique_lock<mutex> lock(audio_mutex);
1811 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1815 task = audio_task_queue.front();
1816 audio_task_queue.pop();
1819 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1820 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1821 vector<float> samples_out = audio_mixer->get_output(
1822 task.frame_timestamp,
1824 rate_adjustment_policy);
1826 // Send the samples to the sound card, then add them to the output.
1828 alsa->write(samples_out);
1830 if (output_card_index != -1) {
1831 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1832 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1834 video_encoder->add_audio(task.pts_int, move(samples_out));
1838 void Mixer::release_display_frame(DisplayFrame *frame)
1840 for (GLuint texnum : frame->temp_textures) {
1841 resource_pool->release_2d_texture(texnum);
1843 frame->temp_textures.clear();
1844 frame->ready_fence.reset();
1845 frame->input_frames.clear();
1850 mixer_thread = thread(&Mixer::thread_func, this);
1851 audio_thread = thread(&Mixer::audio_thread_func, this);
1857 audio_task_queue_changed.notify_one();
1858 mixer_thread.join();
1859 audio_thread.join();
1861 if (global_flags.srt_port >= 0) {
1862 // There's seemingly no other reasonable way to wake up the thread
1863 // (libsrt's epoll equivalent is busy-waiting).
1864 int sock = srt_create_socket();
1867 memset(&addr, 0, sizeof(addr));
1868 addr.sin6_family = AF_INET6;
1869 addr.sin6_addr = IN6ADDR_LOOPBACK_INIT;
1870 addr.sin6_port = htons(global_flags.srt_port);
1871 srt_connect(sock, (sockaddr *)&addr, sizeof(addr));
1879 void Mixer::transition_clicked(int transition_num)
1881 theme->transition_clicked(transition_num, pts());
1884 void Mixer::channel_clicked(int preview_num)
1886 theme->channel_clicked(preview_num);
1889 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1891 lock_guard<mutex> lock(card_mutex);
1892 return ycbcr_interpretation[card_index];
1895 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1897 lock_guard<mutex> lock(card_mutex);
1898 ycbcr_interpretation[card_index] = interpretation;
1901 void Mixer::start_mode_scanning(unsigned card_index)
1903 assert(card_index < MAX_VIDEO_CARDS);
1904 if (cards[card_index].capture == nullptr) {
1905 // Inactive card. Should never happen.
1908 if (is_mode_scanning[card_index]) {
1911 is_mode_scanning[card_index] = true;
1912 mode_scanlist[card_index].clear();
1913 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1914 mode_scanlist[card_index].push_back(mode.first);
1916 assert(!mode_scanlist[card_index].empty());
1917 mode_scanlist_index[card_index] = 0;
1918 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1919 last_mode_scan_change[card_index] = steady_clock::now();
1922 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1924 assert(desired_output_card_index != -1);
1925 lock_guard<mutex> lock(card_mutex);
1926 return cards[desired_output_card_index].output->get_available_video_modes();
1929 string Mixer::get_ffmpeg_filename(unsigned card_index) const
1931 assert(card_index < MAX_VIDEO_CARDS);
1932 assert(cards[card_index].type == CardType::FFMPEG_INPUT);
1933 return ((FFmpegCapture *)(cards[card_index].capture.get()))->get_filename();
1936 void Mixer::set_ffmpeg_filename(unsigned card_index, const string &filename) {
1937 assert(card_index < MAX_VIDEO_CARDS);
1938 assert(cards[card_index].type == CardType::FFMPEG_INPUT);
1939 ((FFmpegCapture *)(cards[card_index].capture.get()))->change_filename(filename);
1942 void Mixer::wait_for_next_frame()
1944 unique_lock<mutex> lock(frame_num_mutex);
1945 unsigned old_frame_num = frame_num;
1946 frame_num_updated.wait_for(lock, seconds(1), // Timeout is just in case.
1947 [old_frame_num, this]{ return this->frame_num > old_frame_num; });
1950 Mixer::OutputChannel::~OutputChannel()
1952 if (has_current_frame) {
1953 parent->release_display_frame(¤t_frame);
1955 if (has_ready_frame) {
1956 parent->release_display_frame(&ready_frame);
1960 void Mixer::OutputChannel::output_frame(DisplayFrame &&frame)
1962 // Store this frame for display. Remove the ready frame if any
1963 // (it was seemingly never used).
1965 lock_guard<mutex> lock(frame_mutex);
1966 if (has_ready_frame) {
1967 parent->release_display_frame(&ready_frame);
1969 ready_frame = move(frame);
1970 has_ready_frame = true;
1972 // Call the callbacks under the mutex (they should be short),
1973 // so that we don't race against a callback removal.
1974 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1975 key_and_callback.second();
1979 // Reduce the number of callbacks by filtering duplicates. The reason
1980 // why we bother doing this is that Qt seemingly can get into a state
1981 // where its builds up an essentially unbounded queue of signals,
1982 // consuming more and more memory, and there's no good way of collapsing
1983 // user-defined signals or limiting the length of the queue.
1984 if (transition_names_updated_callback) {
1985 vector<string> transition_names = global_mixer->get_transition_names();
1986 bool changed = false;
1987 if (transition_names.size() != last_transition_names.size()) {
1990 for (unsigned i = 0; i < transition_names.size(); ++i) {
1991 if (transition_names[i] != last_transition_names[i]) {
1998 transition_names_updated_callback(transition_names);
1999 last_transition_names = transition_names;
2002 if (name_updated_callback) {
2003 string name = global_mixer->get_channel_name(channel);
2004 if (name != last_name) {
2005 name_updated_callback(name);
2009 if (color_updated_callback) {
2010 string color = global_mixer->get_channel_color(channel);
2011 if (color != last_color) {
2012 color_updated_callback(color);
2018 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
2020 lock_guard<mutex> lock(frame_mutex);
2021 if (!has_current_frame && !has_ready_frame) {
2025 if (has_current_frame && has_ready_frame) {
2026 // We have a new ready frame. Toss the current one.
2027 parent->release_display_frame(¤t_frame);
2028 has_current_frame = false;
2030 if (has_ready_frame) {
2031 assert(!has_current_frame);
2032 current_frame = move(ready_frame);
2033 ready_frame.ready_fence.reset(); // Drop the refcount.
2034 ready_frame.input_frames.clear(); // Drop the refcounts.
2035 has_current_frame = true;
2036 has_ready_frame = false;
2039 *frame = current_frame;
2043 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
2045 lock_guard<mutex> lock(frame_mutex);
2046 new_frame_ready_callbacks[key] = callback;
2049 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
2051 lock_guard<mutex> lock(frame_mutex);
2052 new_frame_ready_callbacks.erase(key);
2055 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
2057 transition_names_updated_callback = callback;
2060 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
2062 name_updated_callback = callback;
2065 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
2067 color_updated_callback = callback;
2071 void Mixer::start_srt()
2073 SRTSOCKET sock = srt_create_socket();
2075 memset(&addr, 0, sizeof(addr));
2076 addr.sin6_family = AF_INET6;
2077 addr.sin6_port = htons(global_flags.srt_port);
2080 int err = srt_setsockopt(sock, /*level=*/0, SRTO_IPV6ONLY, &zero, sizeof(zero));
2082 fprintf(stderr, "srt_setsockopt(SRTO_IPV6ONLY): %s\n", srt_getlasterror_str());
2085 err = srt_bind(sock, (sockaddr *)&addr, sizeof(addr));
2087 fprintf(stderr, "srt_bind: %s\n", srt_getlasterror_str());
2090 err = srt_listen(sock, MAX_VIDEO_CARDS);
2092 fprintf(stderr, "srt_listen: %s\n", srt_getlasterror_str());
2096 srt_thread = thread([this, sock] {
2099 int sa_len = sizeof(addr);
2100 int clientsock = srt_accept(sock, (sockaddr *)&addr, &sa_len);
2102 if (clientsock != -1) {
2103 srt_close(clientsock);
2107 if (!global_flags.enable_srt) { // Runtime UI toggle.
2108 // Perhaps not as good as never listening in the first place,
2109 // but much simpler to turn on and off.
2110 srt_close(clientsock);
2113 lock_guard<mutex> lock(hotplug_mutex);
2114 hotplugged_srt_cards.push_back(clientsock);
2121 string Mixer::description_for_card(unsigned card_index)
2123 CaptureCard *card = &cards[card_index];
2124 if (card->capture == nullptr) {
2125 // Should never be called for inactive cards, but OK.
2127 snprintf(buf, sizeof(buf), "Inactive capture card %u", card_index);
2130 if (card->type != CardType::FFMPEG_INPUT) {
2132 snprintf(buf, sizeof(buf), "Capture card %u (%s)", card_index, card->capture->get_description().c_str());
2136 // Number (non-SRT) FFmpeg inputs from zero, separately from the capture cards,
2137 // since it's not too obvious for the user that they are “cards”.
2138 unsigned ffmpeg_index = 0;
2139 for (unsigned i = 0; i < card_index; ++i) {
2140 CaptureCard *other_card = &cards[i];
2141 if (other_card->type == CardType::FFMPEG_INPUT && !is_srt_card(other_card)) {
2146 snprintf(buf, sizeof(buf), "Video input %u (%s)", ffmpeg_index, card->capture->get_description().c_str());
2150 bool Mixer::is_srt_card(const Mixer::CaptureCard *card)
2153 if (card->type == CardType::FFMPEG_INPUT) {
2154 int srt_sock = static_cast<FFmpegCapture *>(card->capture.get())->get_srt_sock();
2155 return srt_sock != -1;
2161 mutex RefCountedGLsync::fence_lock;