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 cbcr_width, unsigned cbcr_height, unsigned v210_width)
85 switch (userdata->pixel_format) {
86 case PixelFormat_10BitYCbCr:
87 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
89 case PixelFormat_8BitYCbCr:
90 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
92 case PixelFormat_8BitBGRA:
93 first = userdata->tex_rgba[field] == 0;
95 case PixelFormat_8BitYCbCrPlanar:
96 first = userdata->tex_y[field] == 0 || userdata->tex_cb[field] == 0 || userdata->tex_cr[field] == 0;
103 width != userdata->last_width[field] ||
104 height != userdata->last_height[field] ||
105 cbcr_width != userdata->last_cbcr_width[field] ||
106 cbcr_height != userdata->last_cbcr_height[field]) {
107 // We changed resolution since last use of this texture, so we need to create
108 // a new object. Note that this each card has its own PBOFrameAllocator,
109 // we don't need to worry about these flip-flopping between resolutions.
110 switch (userdata->pixel_format) {
111 case PixelFormat_10BitYCbCr:
112 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
114 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
117 case PixelFormat_8BitYCbCr: {
118 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
120 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
122 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
124 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
128 case PixelFormat_8BitYCbCrPlanar: {
129 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
131 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
133 glBindTexture(GL_TEXTURE_2D, userdata->tex_cb[field]);
135 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
137 glBindTexture(GL_TEXTURE_2D, userdata->tex_cr[field]);
139 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, cbcr_width, cbcr_height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
143 case PixelFormat_8BitBGRA:
144 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
146 if (global_flags.can_disable_srgb_decoder) { // See the comments in tweaked_inputs.h.
147 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
149 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
154 userdata->last_width[field] = width;
155 userdata->last_height[field] = height;
156 userdata->last_cbcr_width[field] = cbcr_width;
157 userdata->last_cbcr_height[field] = cbcr_height;
159 if (global_flags.ten_bit_input &&
160 (first || v210_width != userdata->last_v210_width[field])) {
161 // Same as above; we need to recreate the texture.
162 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
164 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
166 userdata->last_v210_width[field] = v210_width;
170 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
172 if (interlaced_stride) {
175 if (global_flags.flush_pbos) {
176 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
180 glBindTexture(GL_TEXTURE_2D, tex);
182 if (interlaced_stride) {
183 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
186 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
190 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
192 glBindTexture(GL_TEXTURE_2D, 0);
194 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
200 void QueueLengthPolicy::update_policy(unsigned queue_length)
202 if (queue_length == 0) { // Starvation.
203 if (been_at_safe_point_since_last_starvation && safe_queue_length < unsigned(global_flags.max_input_queue_frames)) {
205 fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frame(s)\n",
206 card_index, safe_queue_length);
208 frames_with_at_least_one = 0;
209 been_at_safe_point_since_last_starvation = false;
212 if (queue_length >= safe_queue_length) {
213 been_at_safe_point_since_last_starvation = true;
215 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 1) {
217 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frame(s)\n",
218 card_index, safe_queue_length);
219 frames_with_at_least_one = 0;
223 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
225 num_cards(num_cards),
226 mixer_surface(create_surface(format)),
227 h264_encoder_surface(create_surface(format)),
228 decklink_output_surface(create_surface(format)),
229 ycbcr_interpretation(global_flags.ycbcr_interpretation),
230 audio_mixer(num_cards)
232 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
235 // This nearly always should be true.
236 global_flags.can_disable_srgb_decoder =
237 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
238 epoxy_has_gl_extension("GL_ARB_sampler_objects");
240 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
241 // will be halved when sampling them, and we need to compensate here.
242 movit_texel_subpixel_precision /= 2.0;
244 resource_pool.reset(new ResourcePool);
245 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
246 output_channel[i].parent = this;
247 output_channel[i].channel = i;
250 ImageFormat inout_format;
251 inout_format.color_space = COLORSPACE_sRGB;
252 inout_format.gamma_curve = GAMMA_sRGB;
254 // Matches the 4:2:0 format created by the main chain.
255 YCbCrFormat ycbcr_format;
256 ycbcr_format.chroma_subsampling_x = 2;
257 ycbcr_format.chroma_subsampling_y = 2;
258 if (global_flags.ycbcr_rec709_coefficients) {
259 ycbcr_format.luma_coefficients = YCBCR_REC_709;
261 ycbcr_format.luma_coefficients = YCBCR_REC_601;
263 ycbcr_format.full_range = false;
264 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
265 ycbcr_format.cb_x_position = 0.0f;
266 ycbcr_format.cr_x_position = 0.0f;
267 ycbcr_format.cb_y_position = 0.5f;
268 ycbcr_format.cr_y_position = 0.5f;
270 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
271 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
273 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
274 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
275 display_chain->add_input(display_input);
276 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
277 display_chain->set_dither_bits(0); // Don't bother.
278 display_chain->finalize();
280 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));
282 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
283 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
285 // Start listening for clients only once VideoEncoder has written its header, if any.
288 // First try initializing the then PCI devices, then USB, then
289 // fill up with fake cards until we have the desired number of cards.
290 unsigned num_pci_devices = 0;
291 unsigned card_index = 0;
294 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
295 if (decklink_iterator != nullptr) {
296 for ( ; card_index < num_cards; ++card_index) {
298 if (decklink_iterator->Next(&decklink) != S_OK) {
302 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
303 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
304 output->set_device(decklink);
305 configure_card(card_index, capture, CardType::LIVE_CARD, output);
308 decklink_iterator->Release();
309 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
311 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
315 unsigned num_usb_devices = BMUSBCapture::num_cards();
316 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
317 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
318 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
319 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
321 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
323 unsigned num_fake_cards = 0;
324 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
325 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
326 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
329 if (num_fake_cards > 0) {
330 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
333 // Initialize all video inputs the theme asked for. Note that these are
334 // all put _after_ the regular cards, which stop at <num_cards> - 1.
335 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
336 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
337 if (card_index >= MAX_VIDEO_CARDS) {
338 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
341 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
342 video_inputs[video_card_index]->set_card_index(card_index);
344 num_video_inputs = video_inputs.size();
346 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
347 BMUSBCapture::start_bm_thread();
349 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
350 cards[card_index].queue_length_policy.reset(card_index);
353 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
355 if (global_flags.ten_bit_input) {
356 if (!v210Converter::has_hardware_support()) {
357 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
358 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
361 v210_converter.reset(new v210Converter());
363 // These are all the widths listed in the Blackmagic SDK documentation
364 // (section 2.7.3, “Display Modes”).
365 v210_converter->precompile_shader(720);
366 v210_converter->precompile_shader(1280);
367 v210_converter->precompile_shader(1920);
368 v210_converter->precompile_shader(2048);
369 v210_converter->precompile_shader(3840);
370 v210_converter->precompile_shader(4096);
372 if (global_flags.ten_bit_output) {
373 if (!v210Converter::has_hardware_support()) {
374 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
375 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
380 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
381 display_timecode_in_stream = global_flags.display_timecode_in_stream;
382 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
384 if (global_flags.enable_alsa_output) {
385 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
387 if (global_flags.output_card != -1) {
388 desired_output_card_index = global_flags.output_card;
389 set_output_card_internal(global_flags.output_card);
395 BMUSBCapture::stop_bm_thread();
397 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
399 unique_lock<mutex> lock(card_mutex);
400 cards[card_index].should_quit = true; // Unblock thread.
401 cards[card_index].new_frames_changed.notify_all();
403 cards[card_index].capture->stop_dequeue_thread();
404 if (cards[card_index].output) {
405 cards[card_index].output->end_output();
406 cards[card_index].output.reset();
410 video_encoder.reset(nullptr);
413 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
415 printf("Configuring card %d...\n", card_index);
417 CaptureCard *card = &cards[card_index];
418 if (card->capture != nullptr) {
419 card->capture->stop_dequeue_thread();
421 card->capture.reset(capture);
422 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
423 card->type = card_type;
424 if (card->output.get() != output) {
425 card->output.reset(output);
428 PixelFormat pixel_format;
429 if (card_type == CardType::FFMPEG_INPUT) {
430 pixel_format = PixelFormat_8BitBGRA;
431 } else if (global_flags.ten_bit_input) {
432 pixel_format = PixelFormat_10BitYCbCr;
434 pixel_format = PixelFormat_8BitYCbCr;
437 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
438 if (card->frame_allocator == nullptr) {
439 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
441 card->capture->set_video_frame_allocator(card->frame_allocator.get());
442 if (card->surface == nullptr) {
443 card->surface = create_surface_with_same_format(mixer_surface);
445 while (!card->new_frames.empty()) card->new_frames.pop_front();
446 card->last_timecode = -1;
447 card->capture->set_pixel_format(pixel_format);
448 card->capture->configure_card();
450 // NOTE: start_bm_capture() happens in thread_func().
452 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
453 audio_mixer.reset_resampler(device);
454 audio_mixer.set_display_name(device, card->capture->get_description());
455 audio_mixer.trigger_state_changed_callback();
458 void Mixer::set_output_card_internal(int card_index)
460 // We don't really need to take card_mutex, since we're in the mixer
461 // thread and don't mess with any queues (which is the only thing that happens
462 // from other threads), but it's probably the safest in the long run.
463 unique_lock<mutex> lock(card_mutex);
464 if (output_card_index != -1) {
465 // Switch the old card from output to input.
466 CaptureCard *old_card = &cards[output_card_index];
467 old_card->output->end_output();
469 // Stop the fake card that we put into place.
470 // This needs to _not_ happen under the mutex, to avoid deadlock
471 // (delivering the last frame needs to take the mutex).
472 CaptureInterface *fake_capture = old_card->capture.get();
474 fake_capture->stop_dequeue_thread();
476 old_card->capture = move(old_card->parked_capture);
477 old_card->is_fake_capture = false;
478 old_card->capture->start_bm_capture();
480 if (card_index != -1) {
481 CaptureCard *card = &cards[card_index];
482 CaptureInterface *capture = card->capture.get();
483 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
484 // several seconds to complete (blocking on DisableVideoInput);
485 // see if we can maybe do it asynchronously.
487 capture->stop_dequeue_thread();
489 card->parked_capture = move(card->capture);
490 CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
491 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
492 card->queue_length_policy.reset(card_index);
493 card->capture->start_bm_capture();
494 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
495 card->output->start_output(desired_output_video_mode, pts_int);
497 output_card_index = card_index;
502 int unwrap_timecode(uint16_t current_wrapped, int last)
504 uint16_t last_wrapped = last & 0xffff;
505 if (current_wrapped > last_wrapped) {
506 return (last & ~0xffff) | current_wrapped;
508 return 0x10000 + ((last & ~0xffff) | current_wrapped);
514 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
515 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
516 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
518 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
519 CaptureCard *card = &cards[card_index];
521 if (is_mode_scanning[card_index]) {
522 if (video_format.has_signal) {
523 // Found a stable signal, so stop scanning.
524 is_mode_scanning[card_index] = false;
526 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
527 steady_clock::time_point now = steady_clock::now();
528 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
529 if (sec_since_last_switch > switch_time_s) {
530 // It isn't this mode; try the next one.
531 mode_scanlist_index[card_index]++;
532 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
533 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
534 last_mode_scan_change[card_index] = now;
539 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
540 assert(frame_length > 0);
542 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;
543 if (num_samples > OUTPUT_FREQUENCY / 10) {
544 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",
545 card_index, int(audio_frame.len), int(audio_offset),
546 timecode, int(video_frame.len), int(video_offset), video_format.id);
547 if (video_frame.owner) {
548 video_frame.owner->release_frame(video_frame);
550 if (audio_frame.owner) {
551 audio_frame.owner->release_frame(audio_frame);
556 int dropped_frames = 0;
557 if (card->last_timecode != -1) {
558 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
561 // Number of samples per frame if we need to insert silence.
562 // (Could be nonintegral, but resampling will save us then.)
563 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
565 if (dropped_frames > MAX_FPS * 2) {
566 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
567 card_index, card->last_timecode, timecode);
568 audio_mixer.reset_resampler(device);
570 } else if (dropped_frames > 0) {
571 // Insert silence as needed.
572 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
573 card_index, dropped_frames, timecode);
577 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
581 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
583 // Done with the audio, so release it.
584 if (audio_frame.owner) {
585 audio_frame.owner->release_frame(audio_frame);
588 card->last_timecode = timecode;
590 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
592 size_t cbcr_width, cbcr_height, cbcr_offset, y_offset;
593 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
594 if (userdata != nullptr && userdata->pixel_format == PixelFormat_8BitYCbCrPlanar) {
595 // The calculation above is wrong for planar Y'CbCr, so just override it.
596 assert(card->type == CardType::FFMPEG_INPUT);
597 assert(video_offset == 0);
598 expected_length = video_frame.len;
600 userdata->ycbcr_format = (static_cast<FFmpegCapture *>(card->capture.get()))->get_current_frame_ycbcr_format();
601 cbcr_width = video_format.width / userdata->ycbcr_format.chroma_subsampling_x;
602 cbcr_height = video_format.height / userdata->ycbcr_format.chroma_subsampling_y;
603 cbcr_offset = video_format.width * video_format.height;
606 // All the other Y'CbCr formats are 4:2:2.
607 cbcr_width = video_format.width / 2;
608 cbcr_height = video_format.height;
609 cbcr_offset = video_offset / 2;
610 y_offset = video_frame.size / 2 + video_offset / 2;
612 if (video_frame.len - video_offset == 0 ||
613 video_frame.len - video_offset != expected_length) {
614 if (video_frame.len != 0) {
615 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
616 card_index, video_frame.len - video_offset, expected_length);
618 if (video_frame.owner) {
619 video_frame.owner->release_frame(video_frame);
622 // Still send on the information that we _had_ a frame, even though it's corrupted,
623 // so that pts can go up accordingly.
625 unique_lock<mutex> lock(card_mutex);
626 CaptureCard::NewFrame new_frame;
627 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
628 new_frame.length = frame_length;
629 new_frame.interlaced = false;
630 new_frame.dropped_frames = dropped_frames;
631 new_frame.received_timestamp = video_frame.received_timestamp;
632 card->new_frames.push_back(move(new_frame));
633 card->new_frames_changed.notify_all();
638 unsigned num_fields = video_format.interlaced ? 2 : 1;
639 steady_clock::time_point frame_upload_start;
640 bool interlaced_stride = false;
641 if (video_format.interlaced) {
642 // Send the two fields along as separate frames; the other side will need to add
643 // a deinterlacer to actually get this right.
644 assert(video_format.height % 2 == 0);
645 video_format.height /= 2;
646 assert(frame_length % 2 == 0);
649 if (video_format.second_field_start == 1) {
650 interlaced_stride = true;
652 frame_upload_start = steady_clock::now();
654 userdata->last_interlaced = video_format.interlaced;
655 userdata->last_has_signal = video_format.has_signal;
656 userdata->last_is_connected = video_format.is_connected;
657 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
658 userdata->last_frame_rate_den = video_format.frame_rate_den;
659 RefCountedFrame frame(video_frame);
661 // Upload the textures.
662 for (unsigned field = 0; field < num_fields; ++field) {
663 // Put the actual texture upload in a lambda that is executed in the main thread.
664 // It is entirely possible to do this in the same thread (and it might even be
665 // faster, depending on the GPU and driver), but it appears to be trickling
666 // driver bugs very easily.
668 // Note that this means we must hold on to the actual frame data in <userdata>
669 // until the upload command is run, but we hold on to <frame> much longer than that
670 // (in fact, all the way until we no longer use the texture in rendering).
671 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, cbcr_height, interlaced_stride, userdata]() {
672 unsigned field_start_line;
674 field_start_line = video_format.second_field_start;
676 field_start_line = video_format.extra_lines_top;
679 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
680 size_t v210_width = video_format.stride / sizeof(uint32_t);
681 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, cbcr_width, cbcr_height, v210_width);
683 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
686 switch (userdata->pixel_format) {
687 case PixelFormat_10BitYCbCr: {
688 size_t field_start = video_offset + video_format.stride * field_start_line;
689 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);
690 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
693 case PixelFormat_8BitYCbCr: {
694 size_t field_y_start = y_offset + video_format.width * field_start_line;
695 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
697 // Make up our own strides, since we are interleaving.
698 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);
699 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);
702 case PixelFormat_8BitYCbCrPlanar: {
703 assert(field_start_line == 0); // We don't really support interlaced here.
704 size_t field_y_start = y_offset;
705 size_t field_cb_start = cbcr_offset;
706 size_t field_cr_start = cbcr_offset + cbcr_width * cbcr_height;
708 // Make up our own strides, since we are interleaving.
709 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);
710 upload_texture(userdata->tex_cb[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cb_start);
711 upload_texture(userdata->tex_cr[field], cbcr_width, cbcr_height, cbcr_width, interlaced_stride, GL_RED, GL_UNSIGNED_BYTE, field_cr_start);
714 case PixelFormat_8BitBGRA: {
715 size_t field_start = video_offset + video_format.stride * field_start_line;
716 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);
723 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
728 // Don't upload the second field as fast as we can; wait until
729 // the field time has approximately passed. (Otherwise, we could
730 // get timing jitter against the other sources, and possibly also
731 // against the video display, although the latter is not as critical.)
732 // This requires our system clock to be reasonably close to the
733 // video clock, but that's not an unreasonable assumption.
734 steady_clock::time_point second_field_start = frame_upload_start +
735 nanoseconds(frame_length * 1000000000 / TIMEBASE);
736 this_thread::sleep_until(second_field_start);
740 unique_lock<mutex> lock(card_mutex);
741 CaptureCard::NewFrame new_frame;
742 new_frame.frame = frame;
743 new_frame.length = frame_length;
744 new_frame.field = field;
745 new_frame.interlaced = video_format.interlaced;
746 new_frame.upload_func = upload_func;
747 new_frame.dropped_frames = dropped_frames;
748 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
749 card->new_frames.push_back(move(new_frame));
750 card->new_frames_changed.notify_all();
755 void Mixer::bm_hotplug_add(libusb_device *dev)
757 lock_guard<mutex> lock(hotplug_mutex);
758 hotplugged_cards.push_back(dev);
761 void Mixer::bm_hotplug_remove(unsigned card_index)
763 cards[card_index].new_frames_changed.notify_all();
766 void Mixer::thread_func()
768 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
770 eglBindAPI(EGL_OPENGL_API);
771 QOpenGLContext *context = create_context(mixer_surface);
772 if (!make_current(context, mixer_surface)) {
777 // Start the actual capture. (We don't want to do it before we're actually ready
778 // to process output frames.)
779 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
780 if (int(card_index) != output_card_index) {
781 cards[card_index].capture->start_bm_capture();
785 steady_clock::time_point start, now;
786 start = steady_clock::now();
788 int stats_dropped_frames = 0;
790 while (!should_quit) {
791 if (desired_output_card_index != output_card_index) {
792 set_output_card_internal(desired_output_card_index);
794 if (output_card_index != -1 &&
795 desired_output_video_mode != output_video_mode) {
796 DeckLinkOutput *output = cards[output_card_index].output.get();
797 output->end_output();
798 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
799 output->start_output(desired_output_video_mode, pts_int);
802 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
803 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
805 bool master_card_is_output;
806 unsigned master_card_index;
807 if (output_card_index != -1) {
808 master_card_is_output = true;
809 master_card_index = output_card_index;
811 master_card_is_output = false;
812 master_card_index = theme->map_signal(master_clock_channel);
813 assert(master_card_index < num_cards);
816 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
817 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);
818 stats_dropped_frames += output_frame_info.dropped_frames;
820 handle_hotplugged_cards();
822 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
823 if (card_index == master_card_index || !has_new_frame[card_index]) {
826 if (new_frames[card_index].frame->len == 0) {
827 ++new_frames[card_index].dropped_frames;
829 if (new_frames[card_index].dropped_frames > 0) {
830 printf("Card %u dropped %d frames before this\n",
831 card_index, int(new_frames[card_index].dropped_frames));
835 // If the first card is reporting a corrupted or otherwise dropped frame,
836 // just increase the pts (skipping over this frame) and don't try to compute anything new.
837 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
838 ++stats_dropped_frames;
839 pts_int += new_frames[master_card_index].length;
843 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
844 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
847 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
848 assert(new_frame->frame != nullptr);
849 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
852 // The new texture might need uploading before use.
853 if (new_frame->upload_func) {
854 new_frame->upload_func();
855 new_frame->upload_func = nullptr;
859 int64_t frame_duration = output_frame_info.frame_duration;
860 render_one_frame(frame_duration);
862 pts_int += frame_duration;
864 now = steady_clock::now();
865 double elapsed = duration<double>(now - start).count();
866 if (frame_num % 100 == 0) {
867 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
868 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
869 1e3 * elapsed / frame_num);
870 // chain->print_phase_timing();
872 // Check our memory usage, to see if we are close to our mlockall()
873 // limit (if at all set).
875 if (getrusage(RUSAGE_SELF, &used) == -1) {
876 perror("getrusage(RUSAGE_SELF)");
882 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
883 perror("getrlimit(RLIMIT_MEMLOCK)");
887 if (limit.rlim_cur == 0) {
888 printf(", using %ld MB memory (locked)",
889 long(used.ru_maxrss / 1024));
891 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
892 long(used.ru_maxrss / 1024),
893 long(limit.rlim_cur / 1048576),
894 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
897 printf(", using %ld MB memory (not locked)",
898 long(used.ru_maxrss / 1024));
905 if (should_cut.exchange(false)) { // Test and clear.
906 video_encoder->do_cut(frame_num);
910 // Reset every 100 frames, so that local variations in frame times
911 // (especially for the first few frames, when the shaders are
912 // compiled etc.) don't make it hard to measure for the entire
913 // remaining duration of the program.
914 if (frame == 10000) {
922 resource_pool->clean_context();
925 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
927 if (output_card_index != -1) {
928 // The output card (ie., cards[output_card_index].output) is the master clock,
929 // so no input card (ie., cards[card_index].capture) is.
932 return (card_index == master_card_index);
935 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
937 // Count the number of frames in the queue, including any frames
938 // we dropped. It's hard to know exactly how we should deal with
939 // dropped (corrupted) input frames; they don't help our goal of
940 // avoiding starvation, but they still add to the problem of latency.
941 // Since dropped frames is going to mean a bump in the signal anyway,
942 // we err on the side of having more stable latency instead.
943 unsigned queue_length = 0;
944 for (const CaptureCard::NewFrame &frame : card->new_frames) {
945 queue_length += frame.dropped_frames + 1;
947 card->queue_length_policy.update_policy(queue_length);
949 // If needed, drop frames until the queue is below the safe limit.
950 // We prefer to drop from the head, because all else being equal,
951 // we'd like more recent frames (less latency).
952 unsigned dropped_frames = 0;
953 while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
954 assert(!card->new_frames.empty());
955 assert(queue_length > card->new_frames.front().dropped_frames);
956 queue_length -= card->new_frames.front().dropped_frames;
958 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
959 // No need to drop anything.
963 card->new_frames.pop_front();
964 card->new_frames_changed.notify_all();
970 if (dropped_frames > 0) {
971 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
972 card_index, dropped_frames);
978 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])
980 OutputFrameInfo output_frame_info;
982 unique_lock<mutex> lock(card_mutex, defer_lock);
983 if (master_card_is_output) {
984 // Clocked to the output, so wait for it to be ready for the next frame.
985 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);
988 // Wait for the master card to have a new frame.
989 // TODO: Add a timeout.
990 output_frame_info.is_preroll = false;
992 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(); });
995 if (master_card_is_output) {
996 handle_hotplugged_cards();
997 } else if (cards[master_card_index].new_frames.empty()) {
998 // We were woken up, but not due to a new frame. Deal with it
1000 assert(cards[master_card_index].capture->get_disconnected());
1001 handle_hotplugged_cards();
1005 if (!master_card_is_output) {
1006 output_frame_info.frame_timestamp =
1007 cards[master_card_index].new_frames.front().received_timestamp;
1010 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
1011 CaptureCard *card = &cards[card_index];
1012 if (input_card_is_master_clock(card_index, master_card_index)) {
1013 // We don't use the queue length policy for the master card,
1014 // but we will if it stops being the master. Thus, clear out
1015 // the policy in case we switch in the future.
1016 card->queue_length_policy.reset(card_index);
1017 assert(!card->new_frames.empty());
1019 trim_queue(card, card_index);
1021 if (!card->new_frames.empty()) {
1022 new_frames[card_index] = move(card->new_frames.front());
1023 has_new_frame[card_index] = true;
1024 card->new_frames.pop_front();
1025 card->new_frames_changed.notify_all();
1029 if (!master_card_is_output) {
1030 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
1031 output_frame_info.frame_duration = new_frames[master_card_index].length;
1034 // This might get off by a fractional sample when changing master card
1035 // between ones with different frame rates, but that's fine.
1036 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
1037 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
1038 fractional_samples = num_samples_times_timebase % TIMEBASE;
1039 assert(output_frame_info.num_samples >= 0);
1041 return output_frame_info;
1044 void Mixer::handle_hotplugged_cards()
1046 // Check for cards that have been disconnected since last frame.
1047 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1048 CaptureCard *card = &cards[card_index];
1049 if (card->capture->get_disconnected()) {
1050 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1051 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1052 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1053 card->queue_length_policy.reset(card_index);
1054 card->capture->start_bm_capture();
1058 // Check for cards that have been connected since last frame.
1059 vector<libusb_device *> hotplugged_cards_copy;
1061 lock_guard<mutex> lock(hotplug_mutex);
1062 swap(hotplugged_cards, hotplugged_cards_copy);
1064 for (libusb_device *new_dev : hotplugged_cards_copy) {
1065 // Look for a fake capture card where we can stick this in.
1066 int free_card_index = -1;
1067 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1068 if (cards[card_index].is_fake_capture) {
1069 free_card_index = card_index;
1074 if (free_card_index == -1) {
1075 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1076 libusb_unref_device(new_dev);
1078 // BMUSBCapture takes ownership.
1079 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1080 CaptureCard *card = &cards[free_card_index];
1081 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1082 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1083 card->queue_length_policy.reset(free_card_index);
1084 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1085 capture->start_bm_capture();
1091 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)
1093 // Resample the audio as needed, including from previously dropped frames.
1094 assert(num_cards > 0);
1095 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1096 const bool dropped_frame = (frame_num != dropped_frames);
1098 // Signal to the audio thread to process this frame.
1099 // Note that if the frame is a dropped frame, we signal that
1100 // we don't want to use this frame as base for adjusting
1101 // the resampler rate. The reason for this is that the timing
1102 // of these frames is often way too late; they typically don't
1103 // “arrive” before we synthesize them. Thus, we could end up
1104 // in a situation where we have inserted e.g. five audio frames
1105 // into the queue before we then start pulling five of them
1106 // back out. This makes ResamplingQueue overestimate the delay,
1107 // causing undue resampler changes. (We _do_ use the last,
1108 // non-dropped frame; perhaps we should just discard that as well,
1109 // since dropped frames are expected to be rare, and it might be
1110 // better to just wait until we have a slightly more normal situation).
1111 unique_lock<mutex> lock(audio_mutex);
1112 bool adjust_rate = !dropped_frame && !is_preroll;
1113 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1114 audio_task_queue_changed.notify_one();
1116 if (dropped_frame) {
1117 // For dropped frames, increase the pts. Note that if the format changed
1118 // in the meantime, we have no way of detecting that; we just have to
1119 // assume the frame length is always the same.
1120 pts_int += length_per_frame;
1125 void Mixer::render_one_frame(int64_t duration)
1127 // Determine the time code for this frame before we start rendering.
1128 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1129 if (display_timecode_on_stdout) {
1130 printf("Timecode: '%s'\n", timecode_text.c_str());
1133 // Update Y'CbCr settings for all cards.
1135 unique_lock<mutex> lock(card_mutex);
1136 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1137 YCbCrInterpretation *interpretation = &ycbcr_interpretation[card_index];
1138 input_state.ycbcr_coefficients_auto[card_index] = interpretation->ycbcr_coefficients_auto;
1139 input_state.ycbcr_coefficients[card_index] = interpretation->ycbcr_coefficients;
1140 input_state.full_range[card_index] = interpretation->full_range;
1144 // Get the main chain from the theme, and set its state immediately.
1145 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1146 EffectChain *chain = theme_main_chain.chain;
1147 theme_main_chain.setup_chain();
1148 //theme_main_chain.chain->enable_phase_timing(true);
1150 // The theme can't (or at least shouldn't!) call connect_signal() on
1151 // each FFmpeg input, so we'll do it here.
1152 for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_signal_connections()) {
1153 conn.first->connect_signal_raw(conn.second->get_card_index());
1156 // If HDMI/SDI output is active and the user has requested auto mode,
1157 // its mode overrides the existing Y'CbCr setting for the chain.
1158 YCbCrLumaCoefficients ycbcr_output_coefficients;
1159 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1160 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1162 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1165 // TODO: Reduce the duplication against theme.cpp.
1166 YCbCrFormat output_ycbcr_format;
1167 output_ycbcr_format.chroma_subsampling_x = 1;
1168 output_ycbcr_format.chroma_subsampling_y = 1;
1169 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1170 output_ycbcr_format.full_range = false;
1171 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1172 chain->change_ycbcr_output_format(output_ycbcr_format);
1174 // Render main chain. If we're using zerocopy Quick Sync encoding
1175 // (the default case), we take an extra copy of the created outputs,
1176 // so that we can display it back to the screen later (it's less memory
1177 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1178 // Ideally, we'd like to avoid taking copies and just use the main textures
1179 // for display as well, but they're just views into VA-API memory and must be
1180 // unmapped during encoding, so we can't use them for display, unfortunately.
1181 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1182 GLuint y_copy_tex, cbcr_copy_tex = 0;
1183 GLuint y_display_tex, cbcr_display_tex;
1184 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1185 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1186 const bool is_zerocopy = video_encoder->is_zerocopy();
1188 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1189 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1190 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1192 y_display_tex = y_copy_tex;
1193 cbcr_display_tex = cbcr_copy_tex;
1195 // y_tex and cbcr_tex will be given by VideoEncoder.
1197 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1198 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1199 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1201 y_display_tex = y_tex;
1202 cbcr_display_tex = cbcr_tex;
1205 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1206 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1211 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1213 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1216 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1218 if (display_timecode_in_stream) {
1219 // Render the timecode on top.
1220 timecode_renderer->render_timecode(fbo, timecode_text);
1223 resource_pool->release_fbo(fbo);
1226 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1228 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1230 if (output_card_index != -1) {
1231 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1233 resource_pool->release_2d_texture(cbcr_full_tex);
1235 // Set the right state for the Y' and CbCr textures we use for display.
1236 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1237 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1238 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1239 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1240 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1242 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1243 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1244 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1245 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1247 RefCountedGLsync fence = video_encoder->end_frame();
1249 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1250 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1251 DisplayFrame live_frame;
1252 live_frame.chain = display_chain.get();
1253 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1254 display_input->set_texture_num(0, y_display_tex);
1255 display_input->set_texture_num(1, cbcr_display_tex);
1257 live_frame.ready_fence = fence;
1258 live_frame.input_frames = {};
1259 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1260 output_channel[OUTPUT_LIVE].output_frame(live_frame);
1262 // Set up preview and any additional channels.
1263 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1264 DisplayFrame display_frame;
1265 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1266 display_frame.chain = chain.chain;
1267 display_frame.setup_chain = chain.setup_chain;
1268 display_frame.ready_fence = fence;
1269 display_frame.input_frames = chain.input_frames;
1270 display_frame.temp_textures = {};
1271 output_channel[i].output_frame(display_frame);
1275 void Mixer::audio_thread_func()
1277 pthread_setname_np(pthread_self(), "Mixer_Audio");
1279 while (!should_quit) {
1283 unique_lock<mutex> lock(audio_mutex);
1284 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1288 task = audio_task_queue.front();
1289 audio_task_queue.pop();
1292 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1293 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1294 vector<float> samples_out = audio_mixer.get_output(
1295 task.frame_timestamp,
1297 rate_adjustment_policy);
1299 // Send the samples to the sound card, then add them to the output.
1301 alsa->write(samples_out);
1303 if (output_card_index != -1) {
1304 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1305 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1307 video_encoder->add_audio(task.pts_int, move(samples_out));
1311 void Mixer::release_display_frame(DisplayFrame *frame)
1313 for (GLuint texnum : frame->temp_textures) {
1314 resource_pool->release_2d_texture(texnum);
1316 frame->temp_textures.clear();
1317 frame->ready_fence.reset();
1318 frame->input_frames.clear();
1323 mixer_thread = thread(&Mixer::thread_func, this);
1324 audio_thread = thread(&Mixer::audio_thread_func, this);
1330 audio_task_queue_changed.notify_one();
1331 mixer_thread.join();
1332 audio_thread.join();
1335 void Mixer::transition_clicked(int transition_num)
1337 theme->transition_clicked(transition_num, pts());
1340 void Mixer::channel_clicked(int preview_num)
1342 theme->channel_clicked(preview_num);
1345 YCbCrInterpretation Mixer::get_input_ycbcr_interpretation(unsigned card_index) const
1347 unique_lock<mutex> lock(card_mutex);
1348 return ycbcr_interpretation[card_index];
1351 void Mixer::set_input_ycbcr_interpretation(unsigned card_index, const YCbCrInterpretation &interpretation)
1353 unique_lock<mutex> lock(card_mutex);
1354 ycbcr_interpretation[card_index] = interpretation;
1357 void Mixer::start_mode_scanning(unsigned card_index)
1359 assert(card_index < num_cards);
1360 if (is_mode_scanning[card_index]) {
1363 is_mode_scanning[card_index] = true;
1364 mode_scanlist[card_index].clear();
1365 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1366 mode_scanlist[card_index].push_back(mode.first);
1368 assert(!mode_scanlist[card_index].empty());
1369 mode_scanlist_index[card_index] = 0;
1370 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1371 last_mode_scan_change[card_index] = steady_clock::now();
1374 map<uint32_t, VideoMode> Mixer::get_available_output_video_modes() const
1376 assert(desired_output_card_index != -1);
1377 unique_lock<mutex> lock(card_mutex);
1378 return cards[desired_output_card_index].output->get_available_video_modes();
1381 Mixer::OutputChannel::~OutputChannel()
1383 if (has_current_frame) {
1384 parent->release_display_frame(¤t_frame);
1386 if (has_ready_frame) {
1387 parent->release_display_frame(&ready_frame);
1391 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1393 // Store this frame for display. Remove the ready frame if any
1394 // (it was seemingly never used).
1396 unique_lock<mutex> lock(frame_mutex);
1397 if (has_ready_frame) {
1398 parent->release_display_frame(&ready_frame);
1400 ready_frame = frame;
1401 has_ready_frame = true;
1403 // Call the callbacks under the mutex (they should be short),
1404 // so that we don't race against a callback removal.
1405 for (const auto &key_and_callback : new_frame_ready_callbacks) {
1406 key_and_callback.second();
1410 // Reduce the number of callbacks by filtering duplicates. The reason
1411 // why we bother doing this is that Qt seemingly can get into a state
1412 // where its builds up an essentially unbounded queue of signals,
1413 // consuming more and more memory, and there's no good way of collapsing
1414 // user-defined signals or limiting the length of the queue.
1415 if (transition_names_updated_callback) {
1416 vector<string> transition_names = global_mixer->get_transition_names();
1417 bool changed = false;
1418 if (transition_names.size() != last_transition_names.size()) {
1421 for (unsigned i = 0; i < transition_names.size(); ++i) {
1422 if (transition_names[i] != last_transition_names[i]) {
1429 transition_names_updated_callback(transition_names);
1430 last_transition_names = transition_names;
1433 if (name_updated_callback) {
1434 string name = global_mixer->get_channel_name(channel);
1435 if (name != last_name) {
1436 name_updated_callback(name);
1440 if (color_updated_callback) {
1441 string color = global_mixer->get_channel_color(channel);
1442 if (color != last_color) {
1443 color_updated_callback(color);
1449 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1451 unique_lock<mutex> lock(frame_mutex);
1452 if (!has_current_frame && !has_ready_frame) {
1456 if (has_current_frame && has_ready_frame) {
1457 // We have a new ready frame. Toss the current one.
1458 parent->release_display_frame(¤t_frame);
1459 has_current_frame = false;
1461 if (has_ready_frame) {
1462 assert(!has_current_frame);
1463 current_frame = ready_frame;
1464 ready_frame.ready_fence.reset(); // Drop the refcount.
1465 ready_frame.input_frames.clear(); // Drop the refcounts.
1466 has_current_frame = true;
1467 has_ready_frame = false;
1470 *frame = current_frame;
1474 void Mixer::OutputChannel::add_frame_ready_callback(void *key, Mixer::new_frame_ready_callback_t callback)
1476 unique_lock<mutex> lock(frame_mutex);
1477 new_frame_ready_callbacks[key] = callback;
1480 void Mixer::OutputChannel::remove_frame_ready_callback(void *key)
1482 unique_lock<mutex> lock(frame_mutex);
1483 new_frame_ready_callbacks.erase(key);
1486 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1488 transition_names_updated_callback = callback;
1491 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1493 name_updated_callback = callback;
1496 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1498 color_updated_callback = callback;
1501 mutex RefCountedGLsync::fence_lock;