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"
45 #include "pbo_frame_allocator.h"
46 #include "ref_counted_gl_sync.h"
47 #include "resampling_queue.h"
49 #include "timecode_renderer.h"
50 #include "v210_converter.h"
51 #include "video_encoder.h"
56 using namespace movit;
58 using namespace std::chrono;
59 using namespace std::placeholders;
60 using namespace bmusb;
62 Mixer *global_mixer = nullptr;
63 bool uses_mlock = false;
67 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
70 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
71 input_state->buffered_frames[card_index][frame_num] =
72 input_state->buffered_frames[card_index][frame_num - 1];
74 input_state->buffered_frames[card_index][0] = { frame, field_num };
76 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
77 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
82 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned v210_width)
85 switch (userdata->pixel_format) {
86 case bmusb::PixelFormat_10BitYCbCr:
87 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
89 case bmusb::PixelFormat_8BitYCbCr:
90 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
92 case bmusb::PixelFormat_8BitBGRA:
93 first = userdata->tex_rgba[field] == 0;
100 width != userdata->last_width[field] ||
101 height != userdata->last_height[field]) {
102 // We changed resolution since last use of this texture, so we need to create
103 // a new object. Note that this each card has its own PBOFrameAllocator,
104 // we don't need to worry about these flip-flopping between resolutions.
105 switch (userdata->pixel_format) {
106 case bmusb::PixelFormat_10BitYCbCr:
107 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
109 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
112 case bmusb::PixelFormat_8BitYCbCr: {
113 size_t cbcr_width = width / 2;
115 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
117 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
119 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
121 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
125 case bmusb::PixelFormat_8BitBGRA:
126 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
128 if (global_flags.can_disable_srgb_decoder) { // See the comments in tweaked_inputs.h.
129 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
131 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
136 userdata->last_width[field] = width;
137 userdata->last_height[field] = height;
139 if (global_flags.ten_bit_input &&
140 (first || v210_width != userdata->last_v210_width[field])) {
141 // Same as above; we need to recreate the texture.
142 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
144 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
146 userdata->last_v210_width[field] = v210_width;
150 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
152 if (interlaced_stride) {
155 if (global_flags.flush_pbos) {
156 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
160 glBindTexture(GL_TEXTURE_2D, tex);
162 if (interlaced_stride) {
163 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
166 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
170 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
172 glBindTexture(GL_TEXTURE_2D, 0);
174 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
180 void QueueLengthPolicy::update_policy(unsigned queue_length)
182 if (queue_length == 0) { // Starvation.
183 if (been_at_safe_point_since_last_starvation && safe_queue_length < unsigned(global_flags.max_input_queue_frames)) {
185 fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frame(s)\n",
186 card_index, safe_queue_length);
188 frames_with_at_least_one = 0;
189 been_at_safe_point_since_last_starvation = false;
192 if (queue_length >= safe_queue_length) {
193 been_at_safe_point_since_last_starvation = true;
195 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 1) {
197 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frame(s)\n",
198 card_index, safe_queue_length);
199 frames_with_at_least_one = 0;
203 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
205 num_cards(num_cards),
206 mixer_surface(create_surface(format)),
207 h264_encoder_surface(create_surface(format)),
208 decklink_output_surface(create_surface(format)),
209 ycbcr_interpretation(global_flags.ycbcr_interpretation),
210 audio_mixer(num_cards)
212 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
215 // This nearly always should be true.
216 global_flags.can_disable_srgb_decoder =
217 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
218 epoxy_has_gl_extension("GL_ARB_sampler_objects");
220 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
221 // will be halved when sampling them, and we need to compensate here.
222 movit_texel_subpixel_precision /= 2.0;
224 resource_pool.reset(new ResourcePool);
225 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
226 output_channel[i].parent = this;
227 output_channel[i].channel = i;
230 ImageFormat inout_format;
231 inout_format.color_space = COLORSPACE_sRGB;
232 inout_format.gamma_curve = GAMMA_sRGB;
234 // Matches the 4:2:0 format created by the main chain.
235 YCbCrFormat ycbcr_format;
236 ycbcr_format.chroma_subsampling_x = 2;
237 ycbcr_format.chroma_subsampling_y = 2;
238 if (global_flags.ycbcr_rec709_coefficients) {
239 ycbcr_format.luma_coefficients = YCBCR_REC_709;
241 ycbcr_format.luma_coefficients = YCBCR_REC_601;
243 ycbcr_format.full_range = false;
244 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
245 ycbcr_format.cb_x_position = 0.0f;
246 ycbcr_format.cr_x_position = 0.0f;
247 ycbcr_format.cb_y_position = 0.5f;
248 ycbcr_format.cr_y_position = 0.5f;
250 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
251 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
253 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
254 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
255 display_chain->add_input(display_input);
256 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
257 display_chain->set_dither_bits(0); // Don't bother.
258 display_chain->finalize();
260 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));
262 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
263 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
265 // Start listening for clients only once VideoEncoder has written its header, if any.
268 // First try initializing the then PCI devices, then USB, then
269 // fill up with fake cards until we have the desired number of cards.
270 unsigned num_pci_devices = 0;
271 unsigned card_index = 0;
274 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
275 if (decklink_iterator != nullptr) {
276 for ( ; card_index < num_cards; ++card_index) {
278 if (decklink_iterator->Next(&decklink) != S_OK) {
282 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
283 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
284 output->set_device(decklink);
285 configure_card(card_index, capture, CardType::LIVE_CARD, output);
288 decklink_iterator->Release();
289 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
291 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
295 unsigned num_usb_devices = BMUSBCapture::num_cards();
296 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
297 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
298 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
299 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
301 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
303 unsigned num_fake_cards = 0;
304 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
305 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
306 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
309 if (num_fake_cards > 0) {
310 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
313 // Initialize all video inputs the theme asked for. Note that these are
314 // all put _after_ the regular cards, which stop at <num_cards> - 1.
315 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
316 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
317 if (card_index >= MAX_VIDEO_CARDS) {
318 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
321 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
322 video_inputs[video_card_index]->set_card_index(card_index);
324 num_video_inputs = video_inputs.size();
326 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
327 BMUSBCapture::start_bm_thread();
329 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
330 cards[card_index].queue_length_policy.reset(card_index);
333 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
335 if (global_flags.ten_bit_input) {
336 if (!v210Converter::has_hardware_support()) {
337 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
338 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
341 v210_converter.reset(new v210Converter());
343 // These are all the widths listed in the Blackmagic SDK documentation
344 // (section 2.7.3, “Display Modes”).
345 v210_converter->precompile_shader(720);
346 v210_converter->precompile_shader(1280);
347 v210_converter->precompile_shader(1920);
348 v210_converter->precompile_shader(2048);
349 v210_converter->precompile_shader(3840);
350 v210_converter->precompile_shader(4096);
352 if (global_flags.ten_bit_output) {
353 if (!v210Converter::has_hardware_support()) {
354 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
355 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
360 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
361 display_timecode_in_stream = global_flags.display_timecode_in_stream;
362 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
364 if (global_flags.enable_alsa_output) {
365 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
367 if (global_flags.output_card != -1) {
368 desired_output_card_index = global_flags.output_card;
369 set_output_card_internal(global_flags.output_card);
375 BMUSBCapture::stop_bm_thread();
377 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
379 unique_lock<mutex> lock(card_mutex);
380 cards[card_index].should_quit = true; // Unblock thread.
381 cards[card_index].new_frames_changed.notify_all();
383 cards[card_index].capture->stop_dequeue_thread();
384 if (cards[card_index].output) {
385 cards[card_index].output->end_output();
386 cards[card_index].output.reset();
390 video_encoder.reset(nullptr);
393 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
395 printf("Configuring card %d...\n", card_index);
397 CaptureCard *card = &cards[card_index];
398 if (card->capture != nullptr) {
399 card->capture->stop_dequeue_thread();
401 card->capture.reset(capture);
402 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
403 if (card->output.get() != output) {
404 card->output.reset(output);
407 bmusb::PixelFormat pixel_format;
408 if (card_type == CardType::FFMPEG_INPUT) {
409 pixel_format = bmusb::PixelFormat_8BitBGRA;
410 } else if (global_flags.ten_bit_input) {
411 pixel_format = PixelFormat_10BitYCbCr;
413 pixel_format = PixelFormat_8BitYCbCr;
416 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
417 if (card->frame_allocator == nullptr) {
418 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
420 card->capture->set_video_frame_allocator(card->frame_allocator.get());
421 if (card->surface == nullptr) {
422 card->surface = create_surface_with_same_format(mixer_surface);
424 while (!card->new_frames.empty()) card->new_frames.pop_front();
425 card->last_timecode = -1;
426 card->capture->set_pixel_format(pixel_format);
427 card->capture->configure_card();
429 // NOTE: start_bm_capture() happens in thread_func().
431 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
432 audio_mixer.reset_resampler(device);
433 audio_mixer.set_display_name(device, card->capture->get_description());
434 audio_mixer.trigger_state_changed_callback();
437 void Mixer::set_output_card_internal(int card_index)
439 // We don't really need to take card_mutex, since we're in the mixer
440 // thread and don't mess with any queues (which is the only thing that happens
441 // from other threads), but it's probably the safest in the long run.
442 unique_lock<mutex> lock(card_mutex);
443 if (output_card_index != -1) {
444 // Switch the old card from output to input.
445 CaptureCard *old_card = &cards[output_card_index];
446 old_card->output->end_output();
448 // Stop the fake card that we put into place.
449 // This needs to _not_ happen under the mutex, to avoid deadlock
450 // (delivering the last frame needs to take the mutex).
451 bmusb::CaptureInterface *fake_capture = old_card->capture.get();
453 fake_capture->stop_dequeue_thread();
455 old_card->capture = move(old_card->parked_capture);
456 old_card->is_fake_capture = false;
457 old_card->capture->start_bm_capture();
459 if (card_index != -1) {
460 CaptureCard *card = &cards[card_index];
461 bmusb::CaptureInterface *capture = card->capture.get();
462 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
463 // several seconds to complete (blocking on DisableVideoInput);
464 // see if we can maybe do it asynchronously.
466 capture->stop_dequeue_thread();
468 card->parked_capture = move(card->capture);
469 bmusb::CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
470 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
471 card->queue_length_policy.reset(card_index);
472 card->capture->start_bm_capture();
473 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
474 card->output->start_output(desired_output_video_mode, pts_int);
476 output_card_index = card_index;
481 int unwrap_timecode(uint16_t current_wrapped, int last)
483 uint16_t last_wrapped = last & 0xffff;
484 if (current_wrapped > last_wrapped) {
485 return (last & ~0xffff) | current_wrapped;
487 return 0x10000 + ((last & ~0xffff) | current_wrapped);
493 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
494 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
495 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
497 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
498 CaptureCard *card = &cards[card_index];
500 if (is_mode_scanning[card_index]) {
501 if (video_format.has_signal) {
502 // Found a stable signal, so stop scanning.
503 is_mode_scanning[card_index] = false;
505 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
506 steady_clock::time_point now = steady_clock::now();
507 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
508 if (sec_since_last_switch > switch_time_s) {
509 // It isn't this mode; try the next one.
510 mode_scanlist_index[card_index]++;
511 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
512 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
513 last_mode_scan_change[card_index] = now;
518 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
519 assert(frame_length > 0);
521 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;
522 if (num_samples > OUTPUT_FREQUENCY / 10) {
523 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",
524 card_index, int(audio_frame.len), int(audio_offset),
525 timecode, int(video_frame.len), int(video_offset), video_format.id);
526 if (video_frame.owner) {
527 video_frame.owner->release_frame(video_frame);
529 if (audio_frame.owner) {
530 audio_frame.owner->release_frame(audio_frame);
535 int dropped_frames = 0;
536 if (card->last_timecode != -1) {
537 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
540 // Number of samples per frame if we need to insert silence.
541 // (Could be nonintegral, but resampling will save us then.)
542 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
544 if (dropped_frames > MAX_FPS * 2) {
545 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
546 card_index, card->last_timecode, timecode);
547 audio_mixer.reset_resampler(device);
549 } else if (dropped_frames > 0) {
550 // Insert silence as needed.
551 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
552 card_index, dropped_frames, timecode);
556 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
560 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
562 // Done with the audio, so release it.
563 if (audio_frame.owner) {
564 audio_frame.owner->release_frame(audio_frame);
567 card->last_timecode = timecode;
569 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
570 if (video_frame.len - video_offset == 0 ||
571 video_frame.len - video_offset != expected_length) {
572 if (video_frame.len != 0) {
573 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
574 card_index, video_frame.len - video_offset, expected_length);
576 if (video_frame.owner) {
577 video_frame.owner->release_frame(video_frame);
580 // Still send on the information that we _had_ a frame, even though it's corrupted,
581 // so that pts can go up accordingly.
583 unique_lock<mutex> lock(card_mutex);
584 CaptureCard::NewFrame new_frame;
585 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
586 new_frame.length = frame_length;
587 new_frame.interlaced = false;
588 new_frame.dropped_frames = dropped_frames;
589 new_frame.received_timestamp = video_frame.received_timestamp;
590 card->new_frames.push_back(move(new_frame));
591 card->new_frames_changed.notify_all();
596 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
598 unsigned num_fields = video_format.interlaced ? 2 : 1;
599 steady_clock::time_point frame_upload_start;
600 bool interlaced_stride = false;
601 if (video_format.interlaced) {
602 // Send the two fields along as separate frames; the other side will need to add
603 // a deinterlacer to actually get this right.
604 assert(video_format.height % 2 == 0);
605 video_format.height /= 2;
606 assert(frame_length % 2 == 0);
609 if (video_format.second_field_start == 1) {
610 interlaced_stride = true;
612 frame_upload_start = steady_clock::now();
614 userdata->last_interlaced = video_format.interlaced;
615 userdata->last_has_signal = video_format.has_signal;
616 userdata->last_is_connected = video_format.is_connected;
617 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
618 userdata->last_frame_rate_den = video_format.frame_rate_den;
619 RefCountedFrame frame(video_frame);
621 // Upload the textures.
622 const size_t cbcr_width = video_format.width / 2;
623 const size_t cbcr_offset = video_offset / 2;
624 const size_t y_offset = video_frame.size / 2 + video_offset / 2;
626 for (unsigned field = 0; field < num_fields; ++field) {
627 // Put the actual texture upload in a lambda that is executed in the main thread.
628 // It is entirely possible to do this in the same thread (and it might even be
629 // faster, depending on the GPU and driver), but it appears to be trickling
630 // driver bugs very easily.
632 // Note that this means we must hold on to the actual frame data in <userdata>
633 // until the upload command is run, but we hold on to <frame> much longer than that
634 // (in fact, all the way until we no longer use the texture in rendering).
635 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, interlaced_stride, userdata]() {
636 unsigned field_start_line;
638 field_start_line = video_format.second_field_start;
640 field_start_line = video_format.extra_lines_top;
643 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
644 size_t v210_width = video_format.stride / sizeof(uint32_t);
645 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, v210_width);
647 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
650 switch (userdata->pixel_format) {
651 case bmusb::PixelFormat_10BitYCbCr: {
652 size_t field_start = video_offset + video_format.stride * field_start_line;
653 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);
654 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
657 case bmusb::PixelFormat_8BitYCbCr: {
658 size_t field_y_start = y_offset + video_format.width * field_start_line;
659 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
661 // Make up our own strides, since we are interleaving.
662 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);
663 upload_texture(userdata->tex_cbcr[field], cbcr_width, video_format.height, cbcr_width * sizeof(uint16_t), interlaced_stride, GL_RG, GL_UNSIGNED_BYTE, field_cbcr_start);
666 case bmusb::PixelFormat_8BitBGRA: {
667 size_t field_start = video_offset + video_format.stride * field_start_line;
668 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);
675 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
680 // Don't upload the second field as fast as we can; wait until
681 // the field time has approximately passed. (Otherwise, we could
682 // get timing jitter against the other sources, and possibly also
683 // against the video display, although the latter is not as critical.)
684 // This requires our system clock to be reasonably close to the
685 // video clock, but that's not an unreasonable assumption.
686 steady_clock::time_point second_field_start = frame_upload_start +
687 nanoseconds(frame_length * 1000000000 / TIMEBASE);
688 this_thread::sleep_until(second_field_start);
692 unique_lock<mutex> lock(card_mutex);
693 CaptureCard::NewFrame new_frame;
694 new_frame.frame = frame;
695 new_frame.length = frame_length;
696 new_frame.field = field;
697 new_frame.interlaced = video_format.interlaced;
698 new_frame.upload_func = upload_func;
699 new_frame.dropped_frames = dropped_frames;
700 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
701 card->new_frames.push_back(move(new_frame));
702 card->new_frames_changed.notify_all();
707 void Mixer::bm_hotplug_add(libusb_device *dev)
709 lock_guard<mutex> lock(hotplug_mutex);
710 hotplugged_cards.push_back(dev);
713 void Mixer::bm_hotplug_remove(unsigned card_index)
715 cards[card_index].new_frames_changed.notify_all();
718 void Mixer::thread_func()
720 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
722 eglBindAPI(EGL_OPENGL_API);
723 QOpenGLContext *context = create_context(mixer_surface);
724 if (!make_current(context, mixer_surface)) {
729 // Start the actual capture. (We don't want to do it before we're actually ready
730 // to process output frames.)
731 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
732 if (int(card_index) != output_card_index) {
733 cards[card_index].capture->start_bm_capture();
737 steady_clock::time_point start, now;
738 start = steady_clock::now();
740 int stats_dropped_frames = 0;
742 while (!should_quit) {
743 if (desired_output_card_index != output_card_index) {
744 set_output_card_internal(desired_output_card_index);
746 if (output_card_index != -1 &&
747 desired_output_video_mode != output_video_mode) {
748 DeckLinkOutput *output = cards[output_card_index].output.get();
749 output->end_output();
750 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
751 output->start_output(desired_output_video_mode, pts_int);
754 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
755 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
757 bool master_card_is_output;
758 unsigned master_card_index;
759 if (output_card_index != -1) {
760 master_card_is_output = true;
761 master_card_index = output_card_index;
763 master_card_is_output = false;
764 master_card_index = theme->map_signal(master_clock_channel);
765 assert(master_card_index < num_cards);
768 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
769 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);
770 stats_dropped_frames += output_frame_info.dropped_frames;
772 handle_hotplugged_cards();
774 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
775 if (card_index == master_card_index || !has_new_frame[card_index]) {
778 if (new_frames[card_index].frame->len == 0) {
779 ++new_frames[card_index].dropped_frames;
781 if (new_frames[card_index].dropped_frames > 0) {
782 printf("Card %u dropped %d frames before this\n",
783 card_index, int(new_frames[card_index].dropped_frames));
787 // If the first card is reporting a corrupted or otherwise dropped frame,
788 // just increase the pts (skipping over this frame) and don't try to compute anything new.
789 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
790 ++stats_dropped_frames;
791 pts_int += new_frames[master_card_index].length;
795 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
796 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
799 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
800 assert(new_frame->frame != nullptr);
801 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
804 // The new texture might need uploading before use.
805 if (new_frame->upload_func) {
806 new_frame->upload_func();
807 new_frame->upload_func = nullptr;
811 int64_t frame_duration = output_frame_info.frame_duration;
812 render_one_frame(frame_duration);
814 pts_int += frame_duration;
816 now = steady_clock::now();
817 double elapsed = duration<double>(now - start).count();
818 if (frame_num % 100 == 0) {
819 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
820 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
821 1e3 * elapsed / frame_num);
822 // chain->print_phase_timing();
824 // Check our memory usage, to see if we are close to our mlockall()
825 // limit (if at all set).
827 if (getrusage(RUSAGE_SELF, &used) == -1) {
828 perror("getrusage(RUSAGE_SELF)");
834 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
835 perror("getrlimit(RLIMIT_MEMLOCK)");
839 if (limit.rlim_cur == 0) {
840 printf(", using %ld MB memory (locked)",
841 long(used.ru_maxrss / 1024));
843 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
844 long(used.ru_maxrss / 1024),
845 long(limit.rlim_cur / 1048576),
846 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
849 printf(", using %ld MB memory (not locked)",
850 long(used.ru_maxrss / 1024));
857 if (should_cut.exchange(false)) { // Test and clear.
858 video_encoder->do_cut(frame_num);
862 // Reset every 100 frames, so that local variations in frame times
863 // (especially for the first few frames, when the shaders are
864 // compiled etc.) don't make it hard to measure for the entire
865 // remaining duration of the program.
866 if (frame == 10000) {
874 resource_pool->clean_context();
877 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
879 if (output_card_index != -1) {
880 // The output card (ie., cards[output_card_index].output) is the master clock,
881 // so no input card (ie., cards[card_index].capture) is.
884 return (card_index == master_card_index);
887 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
889 // Count the number of frames in the queue, including any frames
890 // we dropped. It's hard to know exactly how we should deal with
891 // dropped (corrupted) input frames; they don't help our goal of
892 // avoiding starvation, but they still add to the problem of latency.
893 // Since dropped frames is going to mean a bump in the signal anyway,
894 // we err on the side of having more stable latency instead.
895 unsigned queue_length = 0;
896 for (const CaptureCard::NewFrame &frame : card->new_frames) {
897 queue_length += frame.dropped_frames + 1;
899 card->queue_length_policy.update_policy(queue_length);
901 // If needed, drop frames until the queue is below the safe limit.
902 // We prefer to drop from the head, because all else being equal,
903 // we'd like more recent frames (less latency).
904 unsigned dropped_frames = 0;
905 while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
906 assert(!card->new_frames.empty());
907 assert(queue_length > card->new_frames.front().dropped_frames);
908 queue_length -= card->new_frames.front().dropped_frames;
910 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
911 // No need to drop anything.
915 card->new_frames.pop_front();
916 card->new_frames_changed.notify_all();
922 if (dropped_frames > 0) {
923 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
924 card_index, dropped_frames);
930 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])
932 OutputFrameInfo output_frame_info;
934 unique_lock<mutex> lock(card_mutex, defer_lock);
935 if (master_card_is_output) {
936 // Clocked to the output, so wait for it to be ready for the next frame.
937 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);
940 // Wait for the master card to have a new frame.
941 // TODO: Add a timeout.
942 output_frame_info.is_preroll = false;
944 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(); });
947 if (master_card_is_output) {
948 handle_hotplugged_cards();
949 } else if (cards[master_card_index].new_frames.empty()) {
950 // We were woken up, but not due to a new frame. Deal with it
952 assert(cards[master_card_index].capture->get_disconnected());
953 handle_hotplugged_cards();
957 if (!master_card_is_output) {
958 output_frame_info.frame_timestamp =
959 cards[master_card_index].new_frames.front().received_timestamp;
962 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
963 CaptureCard *card = &cards[card_index];
964 if (input_card_is_master_clock(card_index, master_card_index)) {
965 // We don't use the queue length policy for the master card,
966 // but we will if it stops being the master. Thus, clear out
967 // the policy in case we switch in the future.
968 card->queue_length_policy.reset(card_index);
969 assert(!card->new_frames.empty());
971 trim_queue(card, card_index);
973 if (!card->new_frames.empty()) {
974 new_frames[card_index] = move(card->new_frames.front());
975 has_new_frame[card_index] = true;
976 card->new_frames.pop_front();
977 card->new_frames_changed.notify_all();
981 if (!master_card_is_output) {
982 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
983 output_frame_info.frame_duration = new_frames[master_card_index].length;
986 // This might get off by a fractional sample when changing master card
987 // between ones with different frame rates, but that's fine.
988 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
989 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
990 fractional_samples = num_samples_times_timebase % TIMEBASE;
991 assert(output_frame_info.num_samples >= 0);
993 return output_frame_info;
996 void Mixer::handle_hotplugged_cards()
998 // Check for cards that have been disconnected since last frame.
999 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1000 CaptureCard *card = &cards[card_index];
1001 if (card->capture->get_disconnected()) {
1002 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1003 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1004 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1005 card->queue_length_policy.reset(card_index);
1006 card->capture->start_bm_capture();
1010 // Check for cards that have been connected since last frame.
1011 vector<libusb_device *> hotplugged_cards_copy;
1013 lock_guard<mutex> lock(hotplug_mutex);
1014 swap(hotplugged_cards, hotplugged_cards_copy);
1016 for (libusb_device *new_dev : hotplugged_cards_copy) {
1017 // Look for a fake capture card where we can stick this in.
1018 int free_card_index = -1;
1019 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1020 if (cards[card_index].is_fake_capture) {
1021 free_card_index = card_index;
1026 if (free_card_index == -1) {
1027 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1028 libusb_unref_device(new_dev);
1030 // BMUSBCapture takes ownership.
1031 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1032 CaptureCard *card = &cards[free_card_index];
1033 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1034 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1035 card->queue_length_policy.reset(free_card_index);
1036 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1037 capture->start_bm_capture();
1043 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)
1045 // Resample the audio as needed, including from previously dropped frames.
1046 assert(num_cards > 0);
1047 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1048 const bool dropped_frame = (frame_num != dropped_frames);
1050 // Signal to the audio thread to process this frame.
1051 // Note that if the frame is a dropped frame, we signal that
1052 // we don't want to use this frame as base for adjusting
1053 // the resampler rate. The reason for this is that the timing
1054 // of these frames is often way too late; they typically don't
1055 // “arrive” before we synthesize them. Thus, we could end up
1056 // in a situation where we have inserted e.g. five audio frames
1057 // into the queue before we then start pulling five of them
1058 // back out. This makes ResamplingQueue overestimate the delay,
1059 // causing undue resampler changes. (We _do_ use the last,
1060 // non-dropped frame; perhaps we should just discard that as well,
1061 // since dropped frames are expected to be rare, and it might be
1062 // better to just wait until we have a slightly more normal situation).
1063 unique_lock<mutex> lock(audio_mutex);
1064 bool adjust_rate = !dropped_frame && !is_preroll;
1065 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1066 audio_task_queue_changed.notify_one();
1068 if (dropped_frame) {
1069 // For dropped frames, increase the pts. Note that if the format changed
1070 // in the meantime, we have no way of detecting that; we just have to
1071 // assume the frame length is always the same.
1072 pts_int += length_per_frame;
1077 void Mixer::render_one_frame(int64_t duration)
1079 // Determine the time code for this frame before we start rendering.
1080 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1081 if (display_timecode_on_stdout) {
1082 printf("Timecode: '%s'\n", timecode_text.c_str());
1085 // Update Y'CbCr settings for all cards.
1087 unique_lock<mutex> lock(card_mutex);
1088 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1089 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1090 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1091 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1092 input_state.full_range[card_index] = interpretation->full_range;
1096 // Get the main chain from the theme, and set its state immediately.
1097 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1098 EffectChain *chain = theme_main_chain.chain;
1099 theme_main_chain.setup_chain();
1100 //theme_main_chain.chain->enable_phase_timing(true);
1102 // The theme can't (or at least shouldn't!) call connect_signal() on
1103 // each FFmpeg input, so we'll do it here.
1104 for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_signal_connections()) {
1105 conn.first->connect_signal_raw(conn.second->get_card_index());
1108 // If HDMI/SDI output is active and the user has requested auto mode,
1109 // its mode overrides the existing Y'CbCr setting for the chain.
1110 YCbCrLumaCoefficients ycbcr_output_coefficients;
1111 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1112 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1114 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1117 // TODO: Reduce the duplication against theme.cpp.
1118 YCbCrFormat output_ycbcr_format;
1119 output_ycbcr_format.chroma_subsampling_x = 1;
1120 output_ycbcr_format.chroma_subsampling_y = 1;
1121 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1122 output_ycbcr_format.full_range = false;
1123 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1124 chain->change_ycbcr_output_format(output_ycbcr_format);
1126 // Render main chain. If we're using zerocopy Quick Sync encoding
1127 // (the default case), we take an extra copy of the created outputs,
1128 // so that we can display it back to the screen later (it's less memory
1129 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1130 // Ideally, we'd like to avoid taking copies and just use the main textures
1131 // for display as well, but they're just views into VA-API memory and must be
1132 // unmapped during encoding, so we can't use them for display, unfortunately.
1133 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1134 GLuint y_copy_tex, cbcr_copy_tex = 0;
1135 GLuint y_display_tex, cbcr_display_tex;
1136 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1137 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1138 const bool is_zerocopy = video_encoder->is_zerocopy();
1140 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1141 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1142 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1144 y_display_tex = y_copy_tex;
1145 cbcr_display_tex = cbcr_copy_tex;
1147 // y_tex and cbcr_tex will be given by VideoEncoder.
1149 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1150 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1151 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1153 y_display_tex = y_tex;
1154 cbcr_display_tex = cbcr_tex;
1157 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1158 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1163 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1165 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1168 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1170 if (display_timecode_in_stream) {
1171 // Render the timecode on top.
1172 timecode_renderer->render_timecode(fbo, timecode_text);
1175 resource_pool->release_fbo(fbo);
1178 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1180 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1182 if (output_card_index != -1) {
1183 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1185 resource_pool->release_2d_texture(cbcr_full_tex);
1187 // Set the right state for the Y' and CbCr textures we use for display.
1188 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1189 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1190 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1191 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1192 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1194 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1195 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1196 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1197 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1199 RefCountedGLsync fence = video_encoder->end_frame();
1201 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1202 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1203 DisplayFrame live_frame;
1204 live_frame.chain = display_chain.get();
1205 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1206 display_input->set_texture_num(0, y_display_tex);
1207 display_input->set_texture_num(1, cbcr_display_tex);
1209 live_frame.ready_fence = fence;
1210 live_frame.input_frames = {};
1211 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1212 output_channel[OUTPUT_LIVE].output_frame(live_frame);
1214 // Set up preview and any additional channels.
1215 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1216 DisplayFrame display_frame;
1217 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1218 display_frame.chain = chain.chain;
1219 display_frame.setup_chain = chain.setup_chain;
1220 display_frame.ready_fence = fence;
1221 display_frame.input_frames = chain.input_frames;
1222 display_frame.temp_textures = {};
1223 output_channel[i].output_frame(display_frame);
1227 void Mixer::audio_thread_func()
1229 pthread_setname_np(pthread_self(), "Mixer_Audio");
1231 while (!should_quit) {
1235 unique_lock<mutex> lock(audio_mutex);
1236 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1240 task = audio_task_queue.front();
1241 audio_task_queue.pop();
1244 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1245 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1246 vector<float> samples_out = audio_mixer.get_output(
1247 task.frame_timestamp,
1249 rate_adjustment_policy);
1251 // Send the samples to the sound card, then add them to the output.
1253 alsa->write(samples_out);
1255 if (output_card_index != -1) {
1256 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1257 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1259 video_encoder->add_audio(task.pts_int, move(samples_out));
1263 void Mixer::release_display_frame(DisplayFrame *frame)
1265 for (GLuint texnum : frame->temp_textures) {
1266 resource_pool->release_2d_texture(texnum);
1268 frame->temp_textures.clear();
1269 frame->ready_fence.reset();
1270 frame->input_frames.clear();
1275 mixer_thread = thread(&Mixer::thread_func, this);
1276 audio_thread = thread(&Mixer::audio_thread_func, this);
1282 audio_task_queue_changed.notify_one();
1283 mixer_thread.join();
1284 audio_thread.join();
1287 void Mixer::transition_clicked(int transition_num)
1289 theme->transition_clicked(transition_num, pts());
1292 void Mixer::channel_clicked(int preview_num)
1294 theme->channel_clicked(preview_num);
1297 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1299 unique_lock<mutex> lock(card_mutex);
1300 return ycbcr_interpretation[card_index];
1303 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1305 unique_lock<mutex> lock(card_mutex);
1306 ycbcr_interpretation[card_index] = interpretation;
1309 void Mixer::start_mode_scanning(unsigned card_index)
1311 assert(card_index < num_cards);
1312 if (is_mode_scanning[card_index]) {
1315 is_mode_scanning[card_index] = true;
1316 mode_scanlist[card_index].clear();
1317 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1318 mode_scanlist[card_index].push_back(mode.first);
1320 assert(!mode_scanlist[card_index].empty());
1321 mode_scanlist_index[card_index] = 0;
1322 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1323 last_mode_scan_change[card_index] = steady_clock::now();
1326 map<uint32_t, bmusb::VideoMode> Mixer::get_available_output_video_modes() const
1328 assert(desired_output_card_index != -1);
1329 unique_lock<mutex> lock(card_mutex);
1330 return cards[desired_output_card_index].output->get_available_video_modes();
1333 Mixer::OutputChannel::~OutputChannel()
1335 if (has_current_frame) {
1336 parent->release_display_frame(¤t_frame);
1338 if (has_ready_frame) {
1339 parent->release_display_frame(&ready_frame);
1343 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1345 // Store this frame for display. Remove the ready frame if any
1346 // (it was seemingly never used).
1348 unique_lock<mutex> lock(frame_mutex);
1349 if (has_ready_frame) {
1350 parent->release_display_frame(&ready_frame);
1352 ready_frame = frame;
1353 has_ready_frame = true;
1355 // Call the callbacks under the mutex (they should be short),
1356 // so that we don't race against a callback removal.
1357 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1358 key_and_callback.second();
1362 // Reduce the number of callbacks by filtering duplicates. The reason
1363 // why we bother doing this is that Qt seemingly can get into a state
1364 // where its builds up an essentially unbounded queue of signals,
1365 // consuming more and more memory, and there's no good way of collapsing
1366 // user-defined signals or limiting the length of the queue.
1367 if (transition_names_updated_callback) {
1368 vector<string> transition_names = global_mixer->get_transition_names();
1369 bool changed = false;
1370 if (transition_names.size() != last_transition_names.size()) {
1373 for (unsigned i = 0; i < transition_names.size(); ++i) {
1374 if (transition_names[i] != last_transition_names[i]) {
1381 transition_names_updated_callback(transition_names);
1382 last_transition_names = transition_names;
1385 if (name_updated_callback) {
1386 string name = global_mixer->get_channel_name(channel);
1387 if (name != last_name) {
1388 name_updated_callback(name);
1392 if (color_updated_callback) {
1393 string color = global_mixer->get_channel_color(channel);
1394 if (color != last_color) {
1395 color_updated_callback(color);
1401 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1403 unique_lock<mutex> lock(frame_mutex);
1404 if (!has_current_frame && !has_ready_frame) {
1408 if (has_current_frame && has_ready_frame) {
1409 // We have a new ready frame. Toss the current one.
1410 parent->release_display_frame(¤t_frame);
1411 has_current_frame = false;
1413 if (has_ready_frame) {
1414 assert(!has_current_frame);
1415 current_frame = ready_frame;
1416 ready_frame.ready_fence.reset(); // Drop the refcount.
1417 ready_frame.input_frames.clear(); // Drop the refcounts.
1418 has_current_frame = true;
1419 has_ready_frame = false;
1422 *frame = current_frame;
1426 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1428 unique_lock<mutex> lock(frame_mutex);
1429 new_frame_ready_callbacks[key] = callback;
1432 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1434 unique_lock<mutex> lock(frame_mutex);
1435 new_frame_ready_callbacks.erase(key);
1438 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1440 transition_names_updated_callback = callback;
1443 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1445 name_updated_callback = callback;
1448 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1450 color_updated_callback = callback;
1453 mutex RefCountedGLsync::fence_lock;