7 #include <movit/effect_chain.h>
8 #include <movit/effect_util.h>
9 #include <movit/flat_input.h>
10 #include <movit/image_format.h>
11 #include <movit/init.h>
12 #include <movit/resource_pool.h>
17 #include <sys/resource.h>
20 #include <condition_variable>
31 #include "DeckLinkAPI.h"
33 #include "alsa_output.h"
34 #include "bmusb/bmusb.h"
35 #include "bmusb/fake_capture.h"
36 #include "chroma_subsampler.h"
38 #include "decklink_capture.h"
39 #include "decklink_output.h"
41 #include "disk_space_estimator.h"
42 #include "ffmpeg_capture.h"
44 #include "input_mapping.h"
46 #include "pbo_frame_allocator.h"
47 #include "ref_counted_gl_sync.h"
48 #include "resampling_queue.h"
50 #include "timecode_renderer.h"
51 #include "v210_converter.h"
52 #include "video_encoder.h"
57 using namespace movit;
59 using namespace std::chrono;
60 using namespace std::placeholders;
61 using namespace bmusb;
63 Mixer *global_mixer = nullptr;
64 bool uses_mlock = false;
68 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
71 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
72 input_state->buffered_frames[card_index][frame_num] =
73 input_state->buffered_frames[card_index][frame_num - 1];
75 input_state->buffered_frames[card_index][0] = { frame, field_num };
77 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
78 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
83 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned cbcr_width, unsigned cbcr_height, unsigned v210_width)
86 switch (userdata->pixel_format) {
87 case PixelFormat_10BitYCbCr:
88 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
90 case PixelFormat_8BitYCbCr:
91 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
93 case PixelFormat_8BitBGRA:
94 first = userdata->tex_rgba[field] == 0;
96 case PixelFormat_8BitYCbCrPlanar:
97 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
104 width != userdata->last_width[field] ||
105 height != userdata->last_height[field] ||
106 cbcr_width != userdata->last_cbcr_width[field] ||
107 cbcr_height != userdata->last_cbcr_height[field]) {
108 // We changed resolution since last use of this texture, so we need to create
109 // a new object. Note that this each card has its own PBOFrameAllocator,
110 // we don't need to worry about these flip-flopping between resolutions.
111 switch (userdata->pixel_format) {
112 case PixelFormat_10BitYCbCr:
113 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
115 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
118 case PixelFormat_8BitYCbCr: {
119 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
121 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
123 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
125 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
129 case PixelFormat_8BitYCbCrPlanar: {
130 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
132 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
134 glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
136 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
138 glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
140 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
144 case PixelFormat_8BitBGRA:
145 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
147 if (global_flags.can_disable_srgb_decoder) { // See the comments in tweaked_inputs.h.
148 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
150 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
155 userdata->last_width[field] = width;
156 userdata->last_height[field] = height;
157 userdata->last_cbcr_width[field] = cbcr_width;
158 userdata->last_cbcr_height[field] = cbcr_height;
160 if (global_flags.ten_bit_input &&
161 (first || v210_width != userdata->last_v210_width[field])) {
162 // Same as above; we need to recreate the texture.
163 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
165 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
167 userdata->last_v210_width[field] = v210_width;
171 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
173 if (interlaced_stride) {
176 if (global_flags.flush_pbos) {
177 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
181 glBindTexture(GL_TEXTURE_2D, tex);
183 if (interlaced_stride) {
184 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
187 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
191 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
193 glBindTexture(GL_TEXTURE_2D, 0);
195 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
201 void QueueLengthPolicy::register_metrics(const string &card_name)
203 global_metrics.register_int_metric("input_queue_length_frames{" + card_name + "}", &metric_input_queue_length_frames, Metrics::TYPE_GAUGE);
204 global_metrics.register_int_metric("input_queue_safe_length_frames{" + card_name + "}", &metric_input_queue_safe_length_frames, Metrics::TYPE_GAUGE);
205 global_metrics.register_int_metric("input_queue_duped_frames{" + card_name + "}", &metric_input_duped_frames);
208 void QueueLengthPolicy::update_policy(unsigned queue_length)
210 metric_input_queue_length_frames = queue_length;
212 if (queue_length == 0) { // Starvation.
213 if (been_at_safe_point_since_last_starvation && safe_queue_length < unsigned(global_flags.max_input_queue_frames)) {
215 fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frame(s)\n",
216 card_index, safe_queue_length);
218 frames_with_at_least_one = 0;
219 been_at_safe_point_since_last_starvation = false;
220 ++metric_input_duped_frames;
221 metric_input_queue_safe_length_frames = safe_queue_length;
224 if (queue_length >= safe_queue_length) {
225 been_at_safe_point_since_last_starvation = true;
227 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 1) {
229 metric_input_queue_safe_length_frames = safe_queue_length;
230 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frame(s)\n",
231 card_index, safe_queue_length);
232 frames_with_at_least_one = 0;
236 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
238 num_cards(num_cards),
239 mixer_surface(create_surface(format)),
240 h264_encoder_surface(create_surface(format)),
241 decklink_output_surface(create_surface(format)),
242 ycbcr_interpretation(global_flags.ycbcr_interpretation),
243 audio_mixer(num_cards)
245 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
248 // This nearly always should be true.
249 global_flags.can_disable_srgb_decoder =
250 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
251 epoxy_has_gl_extension("GL_ARB_sampler_objects");
253 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
254 // will be halved when sampling them, and we need to compensate here.
255 movit_texel_subpixel_precision /= 2.0;
257 resource_pool.reset(new ResourcePool);
258 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
259 output_channel[i].parent = this;
260 output_channel[i].channel = i;
263 ImageFormat inout_format;
264 inout_format.color_space = COLORSPACE_sRGB;
265 inout_format.gamma_curve = GAMMA_sRGB;
267 // Matches the 4:2:0 format created by the main chain.
268 YCbCrFormat ycbcr_format;
269 ycbcr_format.chroma_subsampling_x = 2;
270 ycbcr_format.chroma_subsampling_y = 2;
271 if (global_flags.ycbcr_rec709_coefficients) {
272 ycbcr_format.luma_coefficients = YCBCR_REC_709;
274 ycbcr_format.luma_coefficients = YCBCR_REC_601;
276 ycbcr_format.full_range = false;
277 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
278 ycbcr_format.cb_x_position = 0.0f;
279 ycbcr_format.cr_x_position = 0.0f;
280 ycbcr_format.cb_y_position = 0.5f;
281 ycbcr_format.cr_y_position = 0.5f;
283 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
284 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
286 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
287 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
288 display_chain->add_input(display_input);
289 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
290 display_chain->set_dither_bits(0); // Don't bother.
291 display_chain->finalize();
293 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));
295 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
296 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
298 // Start listening for clients only once VideoEncoder has written its header, if any.
301 // First try initializing the then PCI devices, then USB, then
302 // fill up with fake cards until we have the desired number of cards.
303 unsigned num_pci_devices = 0;
304 unsigned card_index = 0;
307 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
308 if (decklink_iterator != nullptr) {
309 for ( ; card_index < num_cards; ++card_index) {
311 if (decklink_iterator->Next(&decklink) != S_OK) {
315 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
316 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
317 output->set_device(decklink);
318 configure_card(card_index, capture, CardType::LIVE_CARD, output);
321 decklink_iterator->Release();
322 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
324 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
328 unsigned num_usb_devices = BMUSBCapture::num_cards();
329 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
330 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
331 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
332 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
334 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
336 unsigned num_fake_cards = 0;
337 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
338 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
339 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
342 if (num_fake_cards > 0) {
343 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
346 // Initialize all video inputs the theme asked for. Note that these are
347 // all put _after_ the regular cards, which stop at <num_cards> - 1.
348 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
349 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
350 if (card_index >= MAX_VIDEO_CARDS) {
351 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
354 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
355 video_inputs[video_card_index]->set_card_index(card_index);
357 num_video_inputs = video_inputs.size();
359 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
360 BMUSBCapture::start_bm_thread();
362 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
363 cards[card_index].queue_length_policy.reset(card_index);
366 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
368 if (global_flags.ten_bit_input) {
369 if (!v210Converter::has_hardware_support()) {
370 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
371 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
374 v210_converter.reset(new v210Converter());
376 // These are all the widths listed in the Blackmagic SDK documentation
377 // (section 2.7.3, “Display Modes”).
378 v210_converter->precompile_shader(720);
379 v210_converter->precompile_shader(1280);
380 v210_converter->precompile_shader(1920);
381 v210_converter->precompile_shader(2048);
382 v210_converter->precompile_shader(3840);
383 v210_converter->precompile_shader(4096);
385 if (global_flags.ten_bit_output) {
386 if (!v210Converter::has_hardware_support()) {
387 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
388 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
393 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
394 display_timecode_in_stream = global_flags.display_timecode_in_stream;
395 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
397 if (global_flags.enable_alsa_output) {
398 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
400 if (global_flags.output_card != -1) {
401 desired_output_card_index = global_flags.output_card;
402 set_output_card_internal(global_flags.output_card);
405 global_metrics.register_int_metric("frames_output_total", &metric_frames_output_total);
406 global_metrics.register_int_metric("frames_output_dropped", &metric_frames_output_dropped);
407 global_metrics.register_double_metric("uptime_seconds", &metric_uptime_seconds);
412 BMUSBCapture::stop_bm_thread();
414 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
416 unique_lock<mutex> lock(card_mutex);
417 cards[card_index].should_quit = true; // Unblock thread.
418 cards[card_index].new_frames_changed.notify_all();
420 cards[card_index].capture->stop_dequeue_thread();
421 if (cards[card_index].output) {
422 cards[card_index].output->end_output();
423 cards[card_index].output.reset();
427 video_encoder.reset(nullptr);
430 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
432 printf("Configuring card %d...\n", card_index);
434 CaptureCard *card = &cards[card_index];
435 if (card->capture != nullptr) {
436 card->capture->stop_dequeue_thread();
438 card->capture.reset(capture);
439 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
440 card->type = card_type;
441 if (card->output.get() != output) {
442 card->output.reset(output);
445 PixelFormat pixel_format;
446 if (card_type == CardType::FFMPEG_INPUT) {
447 pixel_format = capture->get_current_pixel_format();
448 } else if (global_flags.ten_bit_input) {
449 pixel_format = PixelFormat_10BitYCbCr;
451 pixel_format = PixelFormat_8BitYCbCr;
454 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
455 if (card->frame_allocator == nullptr) {
456 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
458 card->capture->set_video_frame_allocator(card->frame_allocator.get());
459 if (card->surface == nullptr) {
460 card->surface = create_surface_with_same_format(mixer_surface);
462 while (!card->new_frames.empty()) card->new_frames.pop_front();
463 card->last_timecode = -1;
464 card->capture->set_pixel_format(pixel_format);
465 card->capture->configure_card();
467 // NOTE: start_bm_capture() happens in thread_func().
469 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
470 audio_mixer.reset_resampler(device);
471 audio_mixer.set_display_name(device, card->capture->get_description());
472 audio_mixer.trigger_state_changed_callback();
477 case CardType::LIVE_CARD:
478 snprintf(card_name, sizeof(card_name), "card=\"%d\",cardtype=\"live\"", card_index);
480 case CardType::FAKE_CAPTURE:
481 snprintf(card_name, sizeof(card_name), "card=\"%d\",cardtype=\"fake\"", card_index);
483 case CardType::FFMPEG_INPUT:
484 snprintf(card_name, sizeof(card_name), "card=\"%d\",cardtype=\"ffmpeg\"", card_index);
489 card->queue_length_policy.register_metrics(card_name);
490 global_metrics.register_int_metric(string("input_dropped_frames_jitter{") + card_name + "}", &card->metric_input_dropped_frames_jitter);
491 global_metrics.register_int_metric(string("input_dropped_frames_error{") + card_name + "}", &card->metric_input_dropped_frames_error);
492 global_metrics.register_int_metric(string("input_dropped_frames_resets{") + card_name + "}", &card->metric_input_resets);
494 global_metrics.register_int_metric(string("input_has_signal_bool{") + card_name + "}", &card->metric_input_has_signal_bool, Metrics::TYPE_GAUGE);
495 global_metrics.register_int_metric(string("input_is_connected_bool{") + card_name + "}", &card->metric_input_is_connected_bool, Metrics::TYPE_GAUGE);
496 global_metrics.register_int_metric(string("input_interlaced_bool{") + card_name + "}", &card->metric_input_interlaced_bool, Metrics::TYPE_GAUGE);
497 global_metrics.register_int_metric(string("input_width_pixels{") + card_name + "}", &card->metric_input_width_pixels, Metrics::TYPE_GAUGE);
498 global_metrics.register_int_metric(string("input_height_pixels{") + card_name + "}", &card->metric_input_height_pixels, Metrics::TYPE_GAUGE);
499 global_metrics.register_int_metric(string("input_frame_rate_nom{") + card_name + "}", &card->metric_input_frame_rate_nom, Metrics::TYPE_GAUGE);
500 global_metrics.register_int_metric(string("input_frame_rate_den{") + card_name + "}", &card->metric_input_frame_rate_den, Metrics::TYPE_GAUGE);
501 global_metrics.register_int_metric(string("input_sample_rate_hz{") + card_name + "}", &card->metric_input_sample_rate_hz, Metrics::TYPE_GAUGE);
504 void Mixer::set_output_card_internal(int card_index)
506 // We don't really need to take card_mutex, since we're in the mixer
507 // thread and don't mess with any queues (which is the only thing that happens
508 // from other threads), but it's probably the safest in the long run.
509 unique_lock<mutex> lock(card_mutex);
510 if (output_card_index != -1) {
511 // Switch the old card from output to input.
512 CaptureCard *old_card = &cards[output_card_index];
513 old_card->output->end_output();
515 // Stop the fake card that we put into place.
516 // This needs to _not_ happen under the mutex, to avoid deadlock
517 // (delivering the last frame needs to take the mutex).
518 CaptureInterface *fake_capture = old_card->capture.get();
520 fake_capture->stop_dequeue_thread();
522 old_card->capture = move(old_card->parked_capture);
523 old_card->is_fake_capture = false;
524 old_card->capture->start_bm_capture();
526 if (card_index != -1) {
527 CaptureCard *card = &cards[card_index];
528 CaptureInterface *capture = card->capture.get();
529 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
530 // several seconds to complete (blocking on DisableVideoInput);
531 // see if we can maybe do it asynchronously.
533 capture->stop_dequeue_thread();
535 card->parked_capture = move(card->capture);
536 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
537 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
538 card->queue_length_policy.reset(card_index);
539 card->capture->start_bm_capture();
540 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
541 card->output->start_output(desired_output_video_mode, pts_int);
543 output_card_index = card_index;
548 int unwrap_timecode(uint16_t current_wrapped, int last)
550 uint16_t last_wrapped = last & 0xffff;
551 if (current_wrapped > last_wrapped) {
552 return (last & ~0xffff) | current_wrapped;
554 return 0x10000 + ((last & ~0xffff) | current_wrapped);
560 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
561 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
562 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
564 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
565 CaptureCard *card = &cards[card_index];
567 card->metric_input_has_signal_bool = video_format.has_signal;
568 card->metric_input_is_connected_bool = video_format.is_connected;
569 card->metric_input_interlaced_bool = video_format.interlaced;
570 card->metric_input_width_pixels = video_format.width;
571 card->metric_input_height_pixels = video_format.height;
572 card->metric_input_frame_rate_nom = video_format.frame_rate_nom;
573 card->metric_input_frame_rate_den = video_format.frame_rate_den;
574 card->metric_input_sample_rate_hz = audio_format.sample_rate;
576 if (is_mode_scanning[card_index]) {
577 if (video_format.has_signal) {
578 // Found a stable signal, so stop scanning.
579 is_mode_scanning[card_index] = false;
581 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
582 steady_clock::time_point now = steady_clock::now();
583 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
584 if (sec_since_last_switch > switch_time_s) {
585 // It isn't this mode; try the next one.
586 mode_scanlist_index[card_index]++;
587 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
588 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
589 last_mode_scan_change[card_index] = now;
594 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
595 assert(frame_length > 0);
597 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;
598 if (num_samples > OUTPUT_FREQUENCY / 10) {
599 printf("Card %d: Dropping frame with implausible audio length (len=%d, offset=%d) [timecode=0x%04x video_len=%d video_offset=%d video_format=%x)\n",
600 card_index, int(audio_frame.len), int(audio_offset),
601 timecode, int(video_frame.len), int(video_offset), video_format.id);
602 if (video_frame.owner) {
603 video_frame.owner->release_frame(video_frame);
605 if (audio_frame.owner) {
606 audio_frame.owner->release_frame(audio_frame);
611 int dropped_frames = 0;
612 if (card->last_timecode != -1) {
613 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
616 // Number of samples per frame if we need to insert silence.
617 // (Could be nonintegral, but resampling will save us then.)
618 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
620 if (dropped_frames > MAX_FPS * 2) {
621 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
622 card_index, card->last_timecode, timecode);
623 audio_mixer.reset_resampler(device);
625 ++card->metric_input_resets;
626 } else if (dropped_frames > 0) {
627 // Insert silence as needed.
628 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
629 card_index, dropped_frames, timecode);
630 card->metric_input_dropped_frames_error += dropped_frames;
634 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
638 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
640 // Done with the audio, so release it.
641 if (audio_frame.owner) {
642 audio_frame.owner->release_frame(audio_frame);
645 card->last_timecode = timecode;
647 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
649 size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
650 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
651 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
652 // The calculation above is wrong for planar Y'CbCr, so just override it.
653 assert(card->type == CardType::FFMPEG_INPUT);
654 assert(video_offset == 0);
655 expected_length = video_frame.len;
657 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
658 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
659 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
660 cbcr_offset = video_format.width * video_format.height;
663 // All the other Y'CbCr formats are 4:2:2.
664 cbcr_width = video_format.width / 2;
665 cbcr_height = video_format.height;
666 cbcr_offset = video_offset / 2;
667 y_offset = video_frame.size / 2 + video_offset / 2;
669 if (video_frame.len - video_offset == 0 ||
670 video_frame.len - video_offset != expected_length) {
671 if (video_frame.len != 0) {
672 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
673 card_index, video_frame.len - video_offset, expected_length);
675 if (video_frame.owner) {
676 video_frame.owner->release_frame(video_frame);
679 // Still send on the information that we _had_ a frame, even though it's corrupted,
680 // so that pts can go up accordingly.
682 unique_lock<mutex> lock(card_mutex);
683 CaptureCard::NewFrame new_frame;
684 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
685 new_frame.length = frame_length;
686 new_frame.interlaced = false;
687 new_frame.dropped_frames = dropped_frames;
688 new_frame.received_timestamp = video_frame.received_timestamp;
689 card->new_frames.push_back(move(new_frame));
690 card->new_frames_changed.notify_all();
695 unsigned num_fields = video_format.interlaced ? 2 : 1;
696 steady_clock::time_point frame_upload_start;
697 bool interlaced_stride = false;
698 if (video_format.interlaced) {
699 // Send the two fields along as separate frames; the other side will need to add
700 // a deinterlacer to actually get this right.
701 assert(video_format.height % 2 == 0);
702 video_format.height /= 2;
704 assert(frame_length % 2 == 0);
707 if (video_format.second_field_start == 1) {
708 interlaced_stride = true;
710 frame_upload_start = steady_clock::now();
712 userdata->last_interlaced = video_format.interlaced;
713 userdata->last_has_signal = video_format.has_signal;
714 userdata->last_is_connected = video_format.is_connected;
715 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
716 userdata->last_frame_rate_den = video_format.frame_rate_den;
717 RefCountedFrame frame(video_frame);
719 // Upload the textures.
720 for (unsigned field = 0; field < num_fields; ++field) {
721 // Put the actual texture upload in a lambda that is executed in the main thread.
722 // It is entirely possible to do this in the same thread (and it might even be
723 // faster, depending on the GPU and driver), but it appears to be trickling
724 // driver bugs very easily.
726 // Note that this means we must hold on to the actual frame data in <userdata>
727 // until the upload command is run, but we hold on to <frame> much longer than that
728 // (in fact, all the way until we no longer use the texture in rendering).
729 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
730 unsigned field_start_line;
732 field_start_line = video_format.second_field_start;
734 field_start_line = video_format.extra_lines_top;
737 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
738 size_t v210_width = video_format.stride / sizeof(uint32_t);
739 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
741 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
744 switch (userdata->pixel_format) {
745 case PixelFormat_10BitYCbCr: {
746 size_t field_start = video_offset + video_format.stride * field_start_line;
747 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);
748 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
751 case PixelFormat_8BitYCbCr: {
752 size_t field_y_start = y_offset + video_format.width * field_start_line;
753 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
755 // Make up our own strides, since we are interleaving.
756 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);
757 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);
760 case PixelFormat_8BitYCbCrPlanar: {
761 assert(field_start_line == 0); // We don't really support interlaced here.
762 size_t field_y_start = y_offset;
763 size_t field_cb_start = cbcr_offset;
764 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
766 // Make up our own strides, since we are interleaving.
767 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);
768 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
769 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
772 case PixelFormat_8BitBGRA: {
773 size_t field_start = video_offset + video_format.stride * field_start_line;
774 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);
775 // These could be asked to deliver mipmaps at any time.
776 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
778 glGenerateMipmap(GL_TEXTURE_2D);
780 glBindTexture(GL_TEXTURE_2D, 0);
788 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
793 // Don't upload the second field as fast as we can; wait until
794 // the field time has approximately passed. (Otherwise, we could
795 // get timing jitter against the other sources, and possibly also
796 // against the video display, although the latter is not as critical.)
797 // This requires our system clock to be reasonably close to the
798 // video clock, but that's not an unreasonable assumption.
799 steady_clock::time_point second_field_start = frame_upload_start +
800 nanoseconds(frame_length * 1000000000 / TIMEBASE);
801 this_thread::sleep_until(second_field_start);
805 unique_lock<mutex> lock(card_mutex);
806 CaptureCard::NewFrame new_frame;
807 new_frame.frame = frame;
808 new_frame.length = frame_length;
809 new_frame.field = field;
810 new_frame.interlaced = video_format.interlaced;
811 new_frame.upload_func = upload_func;
812 new_frame.dropped_frames = dropped_frames;
813 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
814 card->new_frames.push_back(move(new_frame));
815 card->new_frames_changed.notify_all();
820 void Mixer::bm_hotplug_add(libusb_device *dev)
822 lock_guard<mutex> lock(hotplug_mutex);
823 hotplugged_cards.push_back(dev);
826 void Mixer::bm_hotplug_remove(unsigned card_index)
828 cards[card_index].new_frames_changed.notify_all();
831 void Mixer::thread_func()
833 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
835 eglBindAPI(EGL_OPENGL_API);
836 QOpenGLContext *context = create_context(mixer_surface);
837 if (!make_current(context, mixer_surface)) {
842 // Start the actual capture. (We don't want to do it before we're actually ready
843 // to process output frames.)
844 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
845 if (int(card_index) != output_card_index) {
846 cards[card_index].capture->start_bm_capture();
850 steady_clock::time_point start, now;
851 start = steady_clock::now();
853 int stats_dropped_frames = 0;
855 while (!should_quit) {
856 if (desired_output_card_index != output_card_index) {
857 set_output_card_internal(desired_output_card_index);
859 if (output_card_index != -1 &&
860 desired_output_video_mode != output_video_mode) {
861 DeckLinkOutput *output = cards[output_card_index].output.get();
862 output->end_output();
863 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
864 output->start_output(desired_output_video_mode, pts_int);
867 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
868 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
870 bool master_card_is_output;
871 unsigned master_card_index;
872 if (output_card_index != -1) {
873 master_card_is_output = true;
874 master_card_index = output_card_index;
876 master_card_is_output = false;
877 master_card_index = theme->map_signal(master_clock_channel);
878 assert(master_card_index < num_cards);
881 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
882 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);
883 stats_dropped_frames += output_frame_info.dropped_frames;
885 handle_hotplugged_cards();
887 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
888 if (card_index == master_card_index || !has_new_frame[card_index]) {
891 if (new_frames[card_index].frame->len == 0) {
892 ++new_frames[card_index].dropped_frames;
894 if (new_frames[card_index].dropped_frames > 0) {
895 printf("Card %u dropped %d frames before this\n",
896 card_index, int(new_frames[card_index].dropped_frames));
900 // If the first card is reporting a corrupted or otherwise dropped frame,
901 // just increase the pts (skipping over this frame) and don't try to compute anything new.
902 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
903 ++stats_dropped_frames;
904 pts_int += new_frames[master_card_index].length;
908 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
909 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
912 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
913 assert(new_frame->frame != nullptr);
914 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
917 // The new texture might need uploading before use.
918 if (new_frame->upload_func) {
919 new_frame->upload_func();
920 new_frame->upload_func = nullptr;
924 int64_t frame_duration = output_frame_info.frame_duration;
925 render_one_frame(frame_duration);
927 pts_int += frame_duration;
929 now = steady_clock::now();
930 double elapsed = duration<double>(now - start).count();
932 metric_frames_output_total = frame_num;
933 metric_frames_output_dropped = stats_dropped_frames;
934 metric_uptime_seconds = elapsed;
936 if (frame_num % 100 == 0) {
937 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
938 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
939 1e3 * elapsed / frame_num);
940 // chain->print_phase_timing();
942 // Check our memory usage, to see if we are close to our mlockall()
943 // limit (if at all set).
945 if (getrusage(RUSAGE_SELF, &used) == -1) {
946 perror("getrusage(RUSAGE_SELF)");
952 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
953 perror("getrlimit(RLIMIT_MEMLOCK)");
957 if (limit.rlim_cur == 0) {
958 printf(", using %ld MB memory (locked)",
959 long(used.ru_maxrss / 1024));
961 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
962 long(used.ru_maxrss / 1024),
963 long(limit.rlim_cur / 1048576),
964 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
967 printf(", using %ld MB memory (not locked)",
968 long(used.ru_maxrss / 1024));
975 if (should_cut.exchange(false)) { // Test and clear.
976 video_encoder->do_cut(frame_num);
980 // Reset every 100 frames, so that local variations in frame times
981 // (especially for the first few frames, when the shaders are
982 // compiled etc.) don't make it hard to measure for the entire
983 // remaining duration of the program.
984 if (frame == 10000) {
992 resource_pool->clean_context();
995 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
997 if (output_card_index != -1) {
998 // The output card (ie., cards[output_card_index].output) is the master clock,
999 // so no input card (ie., cards[card_index].capture) is.
1002 return (card_index == master_card_index);
1005 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
1007 // Count the number of frames in the queue, including any frames
1008 // we dropped. It's hard to know exactly how we should deal with
1009 // dropped (corrupted) input frames; they don't help our goal of
1010 // avoiding starvation, but they still add to the problem of latency.
1011 // Since dropped frames is going to mean a bump in the signal anyway,
1012 // we err on the side of having more stable latency instead.
1013 unsigned queue_length = 0;
1014 for (const CaptureCard::NewFrame &frame : card->new_frames) {
1015 queue_length += frame.dropped_frames + 1;
1017 card->queue_length_policy.update_policy(queue_length);
1019 // If needed, drop frames until the queue is below the safe limit.
1020 // We prefer to drop from the head, because all else being equal,
1021 // we'd like more recent frames (less latency).
1022 unsigned dropped_frames = 0;
1023 while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
1024 assert(!card->new_frames.empty());
1025 assert(queue_length > card->new_frames.front().dropped_frames);
1026 queue_length -= card->new_frames.front().dropped_frames;
1028 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
1029 // No need to drop anything.
1033 card->new_frames.pop_front();
1034 card->new_frames_changed.notify_all();
1039 card->metric_input_dropped_frames_jitter += dropped_frames;
1042 if (dropped_frames > 0) {
1043 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
1044 card_index, dropped_frames);
1050 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])
1052 OutputFrameInfo output_frame_info;
1054 unique_lock<mutex> lock(card_mutex, defer_lock);
1055 if (master_card_is_output) {
1056 // Clocked to the output, so wait for it to be ready for the next frame.
1057 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);
1060 // Wait for the master card to have a new frame.
1061 // TODO: Add a timeout.
1062 output_frame_info.is_preroll = false;
1064 cards[master_card_index].new_frames_changed.wait(lock, [this, master_card_index]{ return !cards[master_card_index].new_frames.empty() || cards[master_card_index].capture->get_disconnected(); });
1067 if (master_card_is_output) {
1068 handle_hotplugged_cards();
1069 } else if (cards[master_card_index].new_frames.empty()) {
1070 // We were woken up, but not due to a new frame. Deal with it
1071 // and then restart.
1072 assert(cards[master_card_index].capture->get_disconnected());
1073 handle_hotplugged_cards();
1077 if (!master_card_is_output) {
1078 output_frame_info.frame_timestamp =
1079 cards[master_card_index].new_frames.front().received_timestamp;
1082 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
1083 CaptureCard *card = &cards[card_index];
1084 if (input_card_is_master_clock(card_index, master_card_index)) {
1085 // We don't use the queue length policy for the master card,
1086 // but we will if it stops being the master. Thus, clear out
1087 // the policy in case we switch in the future.
1088 card->queue_length_policy.reset(card_index);
1089 assert(!card->new_frames.empty());
1091 trim_queue(card, card_index);
1093 if (!card->new_frames.empty()) {
1094 new_frames[card_index] = move(card->new_frames.front());
1095 has_new_frame[card_index] = true;
1096 card->new_frames.pop_front();
1097 card->new_frames_changed.notify_all();
1101 if (!master_card_is_output) {
1102 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1103 output_frame_info.frame_duration = new_frames[master_card_index].length;
1106 // This might get off by a fractional sample when changing master card
1107 // between ones with different frame rates, but that's fine.
1108 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1109 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1110 fractional_samples = num_samples_times_timebase % TIMEBASE;
1111 assert(output_frame_info.num_samples >= 0);
1113 return output_frame_info;
1116 void Mixer::handle_hotplugged_cards()
1118 // Check for cards that have been disconnected since last frame.
1119 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1120 CaptureCard *card = &cards[card_index];
1121 if (card->capture->get_disconnected()) {
1122 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1123 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1124 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1125 card->queue_length_policy.reset(card_index);
1126 card->capture->start_bm_capture();
1130 // Check for cards that have been connected since last frame.
1131 vector<libusb_device *> hotplugged_cards_copy;
1133 lock_guard<mutex> lock(hotplug_mutex);
1134 swap(hotplugged_cards, hotplugged_cards_copy);
1136 for (libusb_device *new_dev : hotplugged_cards_copy) {
1137 // Look for a fake capture card where we can stick this in.
1138 int free_card_index = -1;
1139 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1140 if (cards[card_index].is_fake_capture) {
1141 free_card_index = card_index;
1146 if (free_card_index == -1) {
1147 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1148 libusb_unref_device(new_dev);
1150 // BMUSBCapture takes ownership.
1151 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1152 CaptureCard *card = &cards[free_card_index];
1153 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1154 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1155 card->queue_length_policy.reset(free_card_index);
1156 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1157 capture->start_bm_capture();
1163 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)
1165 // Resample the audio as needed, including from previously dropped frames.
1166 assert(num_cards > 0);
1167 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1168 const bool dropped_frame = (frame_num != dropped_frames);
1170 // Signal to the audio thread to process this frame.
1171 // Note that if the frame is a dropped frame, we signal that
1172 // we don't want to use this frame as base for adjusting
1173 // the resampler rate. The reason for this is that the timing
1174 // of these frames is often way too late; they typically don't
1175 // “arrive” before we synthesize them. Thus, we could end up
1176 // in a situation where we have inserted e.g. five audio frames
1177 // into the queue before we then start pulling five of them
1178 // back out. This makes ResamplingQueue overestimate the delay,
1179 // causing undue resampler changes. (We _do_ use the last,
1180 // non-dropped frame; perhaps we should just discard that as well,
1181 // since dropped frames are expected to be rare, and it might be
1182 // better to just wait until we have a slightly more normal situation).
1183 unique_lock<mutex> lock(audio_mutex);
1184 bool adjust_rate = !dropped_frame && !is_preroll;
1185 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1186 audio_task_queue_changed.notify_one();
1188 if (dropped_frame) {
1189 // For dropped frames, increase the pts. Note that if the format changed
1190 // in the meantime, we have no way of detecting that; we just have to
1191 // assume the frame length is always the same.
1192 pts_int += length_per_frame;
1197 void Mixer::render_one_frame(int64_t duration)
1199 // Determine the time code for this frame before we start rendering.
1200 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1201 if (display_timecode_on_stdout) {
1202 printf("Timecode: '%s'\n", timecode_text.c_str());
1205 // Update Y'CbCr settings for all cards.
1207 unique_lock<mutex> lock(card_mutex);
1208 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1209 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1210 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1211 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1212 input_state.full_range[card_index] = interpretation->full_range;
1216 // Get the main chain from the theme, and set its state immediately.
1217 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1218 EffectChain *chain = theme_main_chain.chain;
1219 theme_main_chain.setup_chain();
1220 //theme_main_chain.chain->enable_phase_timing(true);
1222 // The theme can't (or at least shouldn't!) call connect_signal() on
1223 // each FFmpeg input, so we'll do it here.
1224 for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_signal_connections()) {
1225 conn.first->connect_signal_raw(conn.second->get_card_index());
1228 // If HDMI/SDI output is active and the user has requested auto mode,
1229 // its mode overrides the existing Y'CbCr setting for the chain.
1230 YCbCrLumaCoefficients ycbcr_output_coefficients;
1231 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1232 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1234 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1237 // TODO: Reduce the duplication against theme.cpp.
1238 YCbCrFormat output_ycbcr_format;
1239 output_ycbcr_format.chroma_subsampling_x = 1;
1240 output_ycbcr_format.chroma_subsampling_y = 1;
1241 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1242 output_ycbcr_format.full_range = false;
1243 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1244 chain->change_ycbcr_output_format(output_ycbcr_format);
1246 // Render main chain. If we're using zerocopy Quick Sync encoding
1247 // (the default case), we take an extra copy of the created outputs,
1248 // so that we can display it back to the screen later (it's less memory
1249 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1250 // Ideally, we'd like to avoid taking copies and just use the main textures
1251 // for display as well, but they're just views into VA-API memory and must be
1252 // unmapped during encoding, so we can't use them for display, unfortunately.
1253 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1254 GLuint y_copy_tex, cbcr_copy_tex = 0;
1255 GLuint y_display_tex, cbcr_display_tex;
1256 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1257 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1258 const bool is_zerocopy = video_encoder->is_zerocopy();
1260 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1261 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1262 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1264 y_display_tex = y_copy_tex;
1265 cbcr_display_tex = cbcr_copy_tex;
1267 // y_tex and cbcr_tex will be given by VideoEncoder.
1269 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1270 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1271 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1273 y_display_tex = y_tex;
1274 cbcr_display_tex = cbcr_tex;
1277 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1278 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1283 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1285 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1288 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1290 if (display_timecode_in_stream) {
1291 // Render the timecode on top.
1292 timecode_renderer->render_timecode(fbo, timecode_text);
1295 resource_pool->release_fbo(fbo);
1298 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1300 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1302 if (output_card_index != -1) {
1303 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1305 resource_pool->release_2d_texture(cbcr_full_tex);
1307 // Set the right state for the Y' and CbCr textures we use for display.
1308 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1309 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1310 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1311 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1312 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1314 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1315 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1316 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1317 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1319 RefCountedGLsync fence = video_encoder->end_frame();
1321 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1322 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1323 DisplayFrame live_frame;
1324 live_frame.chain = display_chain.get();
1325 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1326 display_input->set_texture_num(0, y_display_tex);
1327 display_input->set_texture_num(1, cbcr_display_tex);
1329 live_frame.ready_fence = fence;
1330 live_frame.input_frames = {};
1331 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1332 output_channel[OUTPUT_LIVE].output_frame(live_frame);
1334 // Set up preview and any additional channels.
1335 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1336 DisplayFrame display_frame;
1337 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1338 display_frame.chain = chain.chain;
1339 display_frame.setup_chain = chain.setup_chain;
1340 display_frame.ready_fence = fence;
1341 display_frame.input_frames = chain.input_frames;
1342 display_frame.temp_textures = {};
1343 output_channel[i].output_frame(display_frame);
1347 void Mixer::audio_thread_func()
1349 pthread_setname_np(pthread_self(), "Mixer_Audio");
1351 while (!should_quit) {
1355 unique_lock<mutex> lock(audio_mutex);
1356 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1360 task = audio_task_queue.front();
1361 audio_task_queue.pop();
1364 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1365 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1366 vector<float> samples_out = audio_mixer.get_output(
1367 task.frame_timestamp,
1369 rate_adjustment_policy);
1371 // Send the samples to the sound card, then add them to the output.
1373 alsa->write(samples_out);
1375 if (output_card_index != -1) {
1376 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1377 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1379 video_encoder->add_audio(task.pts_int, move(samples_out));
1383 void Mixer::release_display_frame(DisplayFrame *frame)
1385 for (GLuint texnum : frame->temp_textures) {
1386 resource_pool->release_2d_texture(texnum);
1388 frame->temp_textures.clear();
1389 frame->ready_fence.reset();
1390 frame->input_frames.clear();
1395 mixer_thread = thread(&Mixer::thread_func, this);
1396 audio_thread = thread(&Mixer::audio_thread_func, this);
1402 audio_task_queue_changed.notify_one();
1403 mixer_thread.join();
1404 audio_thread.join();
1407 void Mixer::transition_clicked(int transition_num)
1409 theme->transition_clicked(transition_num, pts());
1412 void Mixer::channel_clicked(int preview_num)
1414 theme->channel_clicked(preview_num);
1417 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1419 unique_lock<mutex> lock(card_mutex);
1420 return ycbcr_interpretation[card_index];
1423 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1425 unique_lock<mutex> lock(card_mutex);
1426 ycbcr_interpretation[card_index] = interpretation;
1429 void Mixer::start_mode_scanning(unsigned card_index)
1431 assert(card_index < num_cards);
1432 if (is_mode_scanning[card_index]) {
1435 is_mode_scanning[card_index] = true;
1436 mode_scanlist[card_index].clear();
1437 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1438 mode_scanlist[card_index].push_back(mode.first);
1440 assert(!mode_scanlist[card_index].empty());
1441 mode_scanlist_index[card_index] = 0;
1442 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1443 last_mode_scan_change[card_index] = steady_clock::now();
1446 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1448 assert(desired_output_card_index != -1);
1449 unique_lock<mutex> lock(card_mutex);
1450 return cards[desired_output_card_index].output->get_available_video_modes();
1453 Mixer::OutputChannel::~OutputChannel()
1455 if (has_current_frame) {
1456 parent->release_display_frame(¤t_frame);
1458 if (has_ready_frame) {
1459 parent->release_display_frame(&ready_frame);
1463 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1465 // Store this frame for display. Remove the ready frame if any
1466 // (it was seemingly never used).
1468 unique_lock<mutex> lock(frame_mutex);
1469 if (has_ready_frame) {
1470 parent->release_display_frame(&ready_frame);
1472 ready_frame = frame;
1473 has_ready_frame = true;
1475 // Call the callbacks under the mutex (they should be short),
1476 // so that we don't race against a callback removal.
1477 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1478 key_and_callback.second();
1482 // Reduce the number of callbacks by filtering duplicates. The reason
1483 // why we bother doing this is that Qt seemingly can get into a state
1484 // where its builds up an essentially unbounded queue of signals,
1485 // consuming more and more memory, and there's no good way of collapsing
1486 // user-defined signals or limiting the length of the queue.
1487 if (transition_names_updated_callback) {
1488 vector<string> transition_names = global_mixer->get_transition_names();
1489 bool changed = false;
1490 if (transition_names.size() != last_transition_names.size()) {
1493 for (unsigned i = 0; i < transition_names.size(); ++i) {
1494 if (transition_names[i] != last_transition_names[i]) {
1501 transition_names_updated_callback(transition_names);
1502 last_transition_names = transition_names;
1505 if (name_updated_callback) {
1506 string name = global_mixer->get_channel_name(channel);
1507 if (name != last_name) {
1508 name_updated_callback(name);
1512 if (color_updated_callback) {
1513 string color = global_mixer->get_channel_color(channel);
1514 if (color != last_color) {
1515 color_updated_callback(color);
1521 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1523 unique_lock<mutex> lock(frame_mutex);
1524 if (!has_current_frame && !has_ready_frame) {
1528 if (has_current_frame && has_ready_frame) {
1529 // We have a new ready frame. Toss the current one.
1530 parent->release_display_frame(¤t_frame);
1531 has_current_frame = false;
1533 if (has_ready_frame) {
1534 assert(!has_current_frame);
1535 current_frame = ready_frame;
1536 ready_frame.ready_fence.reset(); // Drop the refcount.
1537 ready_frame.input_frames.clear(); // Drop the refcounts.
1538 has_current_frame = true;
1539 has_ready_frame = false;
1542 *frame = current_frame;
1546 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1548 unique_lock<mutex> lock(frame_mutex);
1549 new_frame_ready_callbacks[key] = callback;
1552 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1554 unique_lock<mutex> lock(frame_mutex);
1555 new_frame_ready_callbacks.erase(key);
1558 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1560 transition_names_updated_callback = callback;
1563 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1565 name_updated_callback = callback;
1568 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1570 color_updated_callback = callback;
1573 mutex RefCountedGLsync::fence_lock;