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 audio_mixer(num_cards)
211 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
214 // This nearly always should be true.
215 global_flags.can_disable_srgb_decoder =
216 epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode") &&
217 epoxy_has_gl_extension("GL_ARB_sampler_objects");
219 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
220 // will be halved when sampling them, and we need to compensate here.
221 movit_texel_subpixel_precision /= 2.0;
223 resource_pool.reset(new ResourcePool);
224 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
225 output_channel[i].parent = this;
226 output_channel[i].channel = i;
229 ImageFormat inout_format;
230 inout_format.color_space = COLORSPACE_sRGB;
231 inout_format.gamma_curve = GAMMA_sRGB;
233 // Matches the 4:2:0 format created by the main chain.
234 YCbCrFormat ycbcr_format;
235 ycbcr_format.chroma_subsampling_x = 2;
236 ycbcr_format.chroma_subsampling_y = 2;
237 if (global_flags.ycbcr_rec709_coefficients) {
238 ycbcr_format.luma_coefficients = YCBCR_REC_709;
240 ycbcr_format.luma_coefficients = YCBCR_REC_601;
242 ycbcr_format.full_range = false;
243 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
244 ycbcr_format.cb_x_position = 0.0f;
245 ycbcr_format.cr_x_position = 0.0f;
246 ycbcr_format.cb_y_position = 0.5f;
247 ycbcr_format.cr_y_position = 0.5f;
249 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
250 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
252 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
253 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
254 display_chain->add_input(display_input);
255 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
256 display_chain->set_dither_bits(0); // Don't bother.
257 display_chain->finalize();
259 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));
261 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
262 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
264 // Start listening for clients only once VideoEncoder has written its header, if any.
267 // First try initializing the then PCI devices, then USB, then
268 // fill up with fake cards until we have the desired number of cards.
269 unsigned num_pci_devices = 0;
270 unsigned card_index = 0;
273 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
274 if (decklink_iterator != nullptr) {
275 for ( ; card_index < num_cards; ++card_index) {
277 if (decklink_iterator->Next(&decklink) != S_OK) {
281 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
282 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
283 output->set_device(decklink);
284 configure_card(card_index, capture, CardType::LIVE_CARD, output);
287 decklink_iterator->Release();
288 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
290 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
294 unsigned num_usb_devices = BMUSBCapture::num_cards();
295 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
296 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
297 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
298 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
300 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
302 unsigned num_fake_cards = 0;
303 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
304 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
305 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
308 if (num_fake_cards > 0) {
309 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
312 // Initialize all video inputs the theme asked for. Note that these are
313 // all put _after_ the regular cards, which stop at <num_cards> - 1.
314 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
315 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
316 if (card_index >= MAX_VIDEO_CARDS) {
317 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
320 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
321 video_inputs[video_card_index]->set_card_index(card_index);
323 num_video_inputs = video_inputs.size();
325 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
326 BMUSBCapture::start_bm_thread();
328 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
329 cards[card_index].queue_length_policy.reset(card_index);
332 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
334 if (global_flags.ten_bit_input) {
335 if (!v210Converter::has_hardware_support()) {
336 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
337 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
340 v210_converter.reset(new v210Converter());
342 // These are all the widths listed in the Blackmagic SDK documentation
343 // (section 2.7.3, “Display Modes”).
344 v210_converter->precompile_shader(720);
345 v210_converter->precompile_shader(1280);
346 v210_converter->precompile_shader(1920);
347 v210_converter->precompile_shader(2048);
348 v210_converter->precompile_shader(3840);
349 v210_converter->precompile_shader(4096);
351 if (global_flags.ten_bit_output) {
352 if (!v210Converter::has_hardware_support()) {
353 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
354 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
359 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
360 display_timecode_in_stream = global_flags.display_timecode_in_stream;
361 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
363 if (global_flags.enable_alsa_output) {
364 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
366 if (global_flags.output_card != -1) {
367 desired_output_card_index = global_flags.output_card;
368 set_output_card_internal(global_flags.output_card);
374 BMUSBCapture::stop_bm_thread();
376 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
378 unique_lock<mutex> lock(card_mutex);
379 cards[card_index].should_quit = true; // Unblock thread.
380 cards[card_index].new_frames_changed.notify_all();
382 cards[card_index].capture->stop_dequeue_thread();
383 if (cards[card_index].output) {
384 cards[card_index].output->end_output();
385 cards[card_index].output.reset();
389 video_encoder.reset(nullptr);
392 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
394 printf("Configuring card %d...\n", card_index);
396 CaptureCard *card = &cards[card_index];
397 if (card->capture != nullptr) {
398 card->capture->stop_dequeue_thread();
400 card->capture.reset(capture);
401 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
402 if (card->output.get() != output) {
403 card->output.reset(output);
406 bmusb::PixelFormat pixel_format;
407 if (card_type == CardType::FFMPEG_INPUT) {
408 pixel_format = bmusb::PixelFormat_8BitBGRA;
409 } else if (global_flags.ten_bit_input) {
410 pixel_format = PixelFormat_10BitYCbCr;
412 pixel_format = PixelFormat_8BitYCbCr;
415 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
416 if (card->frame_allocator == nullptr) {
417 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
419 card->capture->set_video_frame_allocator(card->frame_allocator.get());
420 if (card->surface == nullptr) {
421 card->surface = create_surface_with_same_format(mixer_surface);
423 while (!card->new_frames.empty()) card->new_frames.pop_front();
424 card->last_timecode = -1;
425 card->capture->set_pixel_format(pixel_format);
426 card->capture->configure_card();
428 // NOTE: start_bm_capture() happens in thread_func().
430 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
431 audio_mixer.reset_resampler(device);
432 audio_mixer.set_display_name(device, card->capture->get_description());
433 audio_mixer.trigger_state_changed_callback();
436 void Mixer::set_output_card_internal(int card_index)
438 // We don't really need to take card_mutex, since we're in the mixer
439 // thread and don't mess with any queues (which is the only thing that happens
440 // from other threads), but it's probably the safest in the long run.
441 unique_lock<mutex> lock(card_mutex);
442 if (output_card_index != -1) {
443 // Switch the old card from output to input.
444 CaptureCard *old_card = &cards[output_card_index];
445 old_card->output->end_output();
447 // Stop the fake card that we put into place.
448 // This needs to _not_ happen under the mutex, to avoid deadlock
449 // (delivering the last frame needs to take the mutex).
450 bmusb::CaptureInterface *fake_capture = old_card->capture.get();
452 fake_capture->stop_dequeue_thread();
454 old_card->capture = move(old_card->parked_capture);
455 old_card->is_fake_capture = false;
456 old_card->capture->start_bm_capture();
458 if (card_index != -1) {
459 CaptureCard *card = &cards[card_index];
460 bmusb::CaptureInterface *capture = card->capture.get();
461 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
462 // several seconds to complete (blocking on DisableVideoInput);
463 // see if we can maybe do it asynchronously.
465 capture->stop_dequeue_thread();
467 card->parked_capture = move(card->capture);
468 bmusb::CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
469 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
470 card->queue_length_policy.reset(card_index);
471 card->capture->start_bm_capture();
472 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
473 card->output->start_output(desired_output_video_mode, pts_int);
475 output_card_index = card_index;
480 int unwrap_timecode(uint16_t current_wrapped, int last)
482 uint16_t last_wrapped = last & 0xffff;
483 if (current_wrapped > last_wrapped) {
484 return (last & ~0xffff) | current_wrapped;
486 return 0x10000 + ((last & ~0xffff) | current_wrapped);
492 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
493 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
494 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
496 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
497 CaptureCard *card = &cards[card_index];
499 if (is_mode_scanning[card_index]) {
500 if (video_format.has_signal) {
501 // Found a stable signal, so stop scanning.
502 is_mode_scanning[card_index] = false;
504 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
505 steady_clock::time_point now = steady_clock::now();
506 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
507 if (sec_since_last_switch > switch_time_s) {
508 // It isn't this mode; try the next one.
509 mode_scanlist_index[card_index]++;
510 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
511 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
512 last_mode_scan_change[card_index] = now;
517 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
518 assert(frame_length > 0);
520 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;
521 if (num_samples > OUTPUT_FREQUENCY / 10) {
522 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",
523 card_index, int(audio_frame.len), int(audio_offset),
524 timecode, int(video_frame.len), int(video_offset), video_format.id);
525 if (video_frame.owner) {
526 video_frame.owner->release_frame(video_frame);
528 if (audio_frame.owner) {
529 audio_frame.owner->release_frame(audio_frame);
534 int dropped_frames = 0;
535 if (card->last_timecode != -1) {
536 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
539 // Number of samples per frame if we need to insert silence.
540 // (Could be nonintegral, but resampling will save us then.)
541 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
543 if (dropped_frames > MAX_FPS * 2) {
544 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
545 card_index, card->last_timecode, timecode);
546 audio_mixer.reset_resampler(device);
548 } else if (dropped_frames > 0) {
549 // Insert silence as needed.
550 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
551 card_index, dropped_frames, timecode);
555 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
559 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
561 // Done with the audio, so release it.
562 if (audio_frame.owner) {
563 audio_frame.owner->release_frame(audio_frame);
566 card->last_timecode = timecode;
568 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
569 if (video_frame.len - video_offset == 0 ||
570 video_frame.len - video_offset != expected_length) {
571 if (video_frame.len != 0) {
572 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
573 card_index, video_frame.len - video_offset, expected_length);
575 if (video_frame.owner) {
576 video_frame.owner->release_frame(video_frame);
579 // Still send on the information that we _had_ a frame, even though it's corrupted,
580 // so that pts can go up accordingly.
582 unique_lock<mutex> lock(card_mutex);
583 CaptureCard::NewFrame new_frame;
584 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
585 new_frame.length = frame_length;
586 new_frame.interlaced = false;
587 new_frame.dropped_frames = dropped_frames;
588 new_frame.received_timestamp = video_frame.received_timestamp;
589 card->new_frames.push_back(move(new_frame));
590 card->new_frames_changed.notify_all();
595 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
597 unsigned num_fields = video_format.interlaced ? 2 : 1;
598 steady_clock::time_point frame_upload_start;
599 bool interlaced_stride = false;
600 if (video_format.interlaced) {
601 // Send the two fields along as separate frames; the other side will need to add
602 // a deinterlacer to actually get this right.
603 assert(video_format.height % 2 == 0);
604 video_format.height /= 2;
605 assert(frame_length % 2 == 0);
608 if (video_format.second_field_start == 1) {
609 interlaced_stride = true;
611 frame_upload_start = steady_clock::now();
613 userdata->last_interlaced = video_format.interlaced;
614 userdata->last_has_signal = video_format.has_signal;
615 userdata->last_is_connected = video_format.is_connected;
616 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
617 userdata->last_frame_rate_den = video_format.frame_rate_den;
618 RefCountedFrame frame(video_frame);
620 // Upload the textures.
621 const size_t cbcr_width = video_format.width / 2;
622 const size_t cbcr_offset = video_offset / 2;
623 const size_t y_offset = video_frame.size / 2 + video_offset / 2;
625 for (unsigned field = 0; field < num_fields; ++field) {
626 // Put the actual texture upload in a lambda that is executed in the main thread.
627 // It is entirely possible to do this in the same thread (and it might even be
628 // faster, depending on the GPU and driver), but it appears to be trickling
629 // driver bugs very easily.
631 // Note that this means we must hold on to the actual frame data in <userdata>
632 // until the upload command is run, but we hold on to <frame> much longer than that
633 // (in fact, all the way until we no longer use the texture in rendering).
634 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, interlaced_stride, userdata]() {
635 unsigned field_start_line;
637 field_start_line = video_format.second_field_start;
639 field_start_line = video_format.extra_lines_top;
642 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
643 size_t v210_width = video_format.stride / sizeof(uint32_t);
644 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, v210_width);
646 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
649 switch (userdata->pixel_format) {
650 case bmusb::PixelFormat_10BitYCbCr: {
651 size_t field_start = video_offset + video_format.stride * field_start_line;
652 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);
653 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
656 case bmusb::PixelFormat_8BitYCbCr: {
657 size_t field_y_start = y_offset + video_format.width * field_start_line;
658 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
660 // Make up our own strides, since we are interleaving.
661 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);
662 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);
665 case bmusb::PixelFormat_8BitBGRA: {
666 size_t field_start = video_offset + video_format.stride * field_start_line;
667 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);
674 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
679 // Don't upload the second field as fast as we can; wait until
680 // the field time has approximately passed. (Otherwise, we could
681 // get timing jitter against the other sources, and possibly also
682 // against the video display, although the latter is not as critical.)
683 // This requires our system clock to be reasonably close to the
684 // video clock, but that's not an unreasonable assumption.
685 steady_clock::time_point second_field_start = frame_upload_start +
686 nanoseconds(frame_length * 1000000000 / TIMEBASE);
687 this_thread::sleep_until(second_field_start);
691 unique_lock<mutex> lock(card_mutex);
692 CaptureCard::NewFrame new_frame;
693 new_frame.frame = frame;
694 new_frame.length = frame_length;
695 new_frame.field = field;
696 new_frame.interlaced = video_format.interlaced;
697 new_frame.upload_func = upload_func;
698 new_frame.dropped_frames = dropped_frames;
699 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
700 card->new_frames.push_back(move(new_frame));
701 card->new_frames_changed.notify_all();
706 void Mixer::bm_hotplug_add(libusb_device *dev)
708 lock_guard<mutex> lock(hotplug_mutex);
709 hotplugged_cards.push_back(dev);
712 void Mixer::bm_hotplug_remove(unsigned card_index)
714 cards[card_index].new_frames_changed.notify_all();
717 void Mixer::thread_func()
719 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
721 eglBindAPI(EGL_OPENGL_API);
722 QOpenGLContext *context = create_context(mixer_surface);
723 if (!make_current(context, mixer_surface)) {
728 // Start the actual capture. (We don't want to do it before we're actually ready
729 // to process output frames.)
730 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
731 if (int(card_index) != output_card_index) {
732 cards[card_index].capture->start_bm_capture();
736 steady_clock::time_point start, now;
737 start = steady_clock::now();
739 int stats_dropped_frames = 0;
741 while (!should_quit) {
742 if (desired_output_card_index != output_card_index) {
743 set_output_card_internal(desired_output_card_index);
745 if (output_card_index != -1 &&
746 desired_output_video_mode != output_video_mode) {
747 DeckLinkOutput *output = cards[output_card_index].output.get();
748 output->end_output();
749 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
750 output->start_output(desired_output_video_mode, pts_int);
753 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
754 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
756 bool master_card_is_output;
757 unsigned master_card_index;
758 if (output_card_index != -1) {
759 master_card_is_output = true;
760 master_card_index = output_card_index;
762 master_card_is_output = false;
763 master_card_index = theme->map_signal(master_clock_channel);
764 assert(master_card_index < num_cards);
767 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
768 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);
769 stats_dropped_frames += output_frame_info.dropped_frames;
771 handle_hotplugged_cards();
773 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
774 if (card_index == master_card_index || !has_new_frame[card_index]) {
777 if (new_frames[card_index].frame->len == 0) {
778 ++new_frames[card_index].dropped_frames;
780 if (new_frames[card_index].dropped_frames > 0) {
781 printf("Card %u dropped %d frames before this\n",
782 card_index, int(new_frames[card_index].dropped_frames));
786 // If the first card is reporting a corrupted or otherwise dropped frame,
787 // just increase the pts (skipping over this frame) and don't try to compute anything new.
788 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
789 ++stats_dropped_frames;
790 pts_int += new_frames[master_card_index].length;
794 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
795 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
798 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
799 assert(new_frame->frame != nullptr);
800 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
803 // The new texture might need uploading before use.
804 if (new_frame->upload_func) {
805 new_frame->upload_func();
806 new_frame->upload_func = nullptr;
810 int64_t frame_duration = output_frame_info.frame_duration;
811 render_one_frame(frame_duration);
813 pts_int += frame_duration;
815 now = steady_clock::now();
816 double elapsed = duration<double>(now - start).count();
817 if (frame_num % 100 == 0) {
818 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
819 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
820 1e3 * elapsed / frame_num);
821 // chain->print_phase_timing();
823 // Check our memory usage, to see if we are close to our mlockall()
824 // limit (if at all set).
826 if (getrusage(RUSAGE_SELF, &used) == -1) {
827 perror("getrusage(RUSAGE_SELF)");
833 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
834 perror("getrlimit(RLIMIT_MEMLOCK)");
838 if (limit.rlim_cur == 0) {
839 printf(", using %ld MB memory (locked)",
840 long(used.ru_maxrss / 1024));
842 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
843 long(used.ru_maxrss / 1024),
844 long(limit.rlim_cur / 1048576),
845 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
848 printf(", using %ld MB memory (not locked)",
849 long(used.ru_maxrss / 1024));
856 if (should_cut.exchange(false)) { // Test and clear.
857 video_encoder->do_cut(frame_num);
861 // Reset every 100 frames, so that local variations in frame times
862 // (especially for the first few frames, when the shaders are
863 // compiled etc.) don't make it hard to measure for the entire
864 // remaining duration of the program.
865 if (frame == 10000) {
873 resource_pool->clean_context();
876 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
878 if (output_card_index != -1) {
879 // The output card (ie., cards[output_card_index].output) is the master clock,
880 // so no input card (ie., cards[card_index].capture) is.
883 return (card_index == master_card_index);
886 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
888 // Count the number of frames in the queue, including any frames
889 // we dropped. It's hard to know exactly how we should deal with
890 // dropped (corrupted) input frames; they don't help our goal of
891 // avoiding starvation, but they still add to the problem of latency.
892 // Since dropped frames is going to mean a bump in the signal anyway,
893 // we err on the side of having more stable latency instead.
894 unsigned queue_length = 0;
895 for (const CaptureCard::NewFrame &frame : card->new_frames) {
896 queue_length += frame.dropped_frames + 1;
898 card->queue_length_policy.update_policy(queue_length);
900 // If needed, drop frames until the queue is below the safe limit.
901 // We prefer to drop from the head, because all else being equal,
902 // we'd like more recent frames (less latency).
903 unsigned dropped_frames = 0;
904 while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
905 assert(!card->new_frames.empty());
906 assert(queue_length > card->new_frames.front().dropped_frames);
907 queue_length -= card->new_frames.front().dropped_frames;
909 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
910 // No need to drop anything.
914 card->new_frames.pop_front();
915 card->new_frames_changed.notify_all();
921 if (dropped_frames > 0) {
922 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
923 card_index, dropped_frames);
929 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])
931 OutputFrameInfo output_frame_info;
933 unique_lock<mutex> lock(card_mutex, defer_lock);
934 if (master_card_is_output) {
935 // Clocked to the output, so wait for it to be ready for the next frame.
936 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);
939 // Wait for the master card to have a new frame.
940 // TODO: Add a timeout.
941 output_frame_info.is_preroll = false;
943 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(); });
946 if (master_card_is_output) {
947 handle_hotplugged_cards();
948 } else if (cards[master_card_index].new_frames.empty()) {
949 // We were woken up, but not due to a new frame. Deal with it
951 assert(cards[master_card_index].capture->get_disconnected());
952 handle_hotplugged_cards();
956 if (!master_card_is_output) {
957 output_frame_info.frame_timestamp =
958 cards[master_card_index].new_frames.front().received_timestamp;
961 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
962 CaptureCard *card = &cards[card_index];
963 if (input_card_is_master_clock(card_index, master_card_index)) {
964 // We don't use the queue length policy for the master card,
965 // but we will if it stops being the master. Thus, clear out
966 // the policy in case we switch in the future.
967 card->queue_length_policy.reset(card_index);
968 assert(!card->new_frames.empty());
970 trim_queue(card, card_index);
972 if (!card->new_frames.empty()) {
973 new_frames[card_index] = move(card->new_frames.front());
974 has_new_frame[card_index] = true;
975 card->new_frames.pop_front();
976 card->new_frames_changed.notify_all();
980 if (!master_card_is_output) {
981 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
982 output_frame_info.frame_duration = new_frames[master_card_index].length;
985 // This might get off by a fractional sample when changing master card
986 // between ones with different frame rates, but that's fine.
987 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
988 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
989 fractional_samples = num_samples_times_timebase % TIMEBASE;
990 assert(output_frame_info.num_samples >= 0);
992 return output_frame_info;
995 void Mixer::handle_hotplugged_cards()
997 // Check for cards that have been disconnected since last frame.
998 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
999 CaptureCard *card = &cards[card_index];
1000 if (card->capture->get_disconnected()) {
1001 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1002 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1003 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1004 card->queue_length_policy.reset(card_index);
1005 card->capture->start_bm_capture();
1009 // Check for cards that have been connected since last frame.
1010 vector<libusb_device *> hotplugged_cards_copy;
1012 lock_guard<mutex> lock(hotplug_mutex);
1013 swap(hotplugged_cards, hotplugged_cards_copy);
1015 for (libusb_device *new_dev : hotplugged_cards_copy) {
1016 // Look for a fake capture card where we can stick this in.
1017 int free_card_index = -1;
1018 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1019 if (cards[card_index].is_fake_capture) {
1020 free_card_index = card_index;
1025 if (free_card_index == -1) {
1026 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1027 libusb_unref_device(new_dev);
1029 // BMUSBCapture takes ownership.
1030 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1031 CaptureCard *card = &cards[free_card_index];
1032 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1033 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1034 card->queue_length_policy.reset(free_card_index);
1035 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1036 capture->start_bm_capture();
1042 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)
1044 // Resample the audio as needed, including from previously dropped frames.
1045 assert(num_cards > 0);
1046 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1047 const bool dropped_frame = (frame_num != dropped_frames);
1049 // Signal to the audio thread to process this frame.
1050 // Note that if the frame is a dropped frame, we signal that
1051 // we don't want to use this frame as base for adjusting
1052 // the resampler rate. The reason for this is that the timing
1053 // of these frames is often way too late; they typically don't
1054 // “arrive” before we synthesize them. Thus, we could end up
1055 // in a situation where we have inserted e.g. five audio frames
1056 // into the queue before we then start pulling five of them
1057 // back out. This makes ResamplingQueue overestimate the delay,
1058 // causing undue resampler changes. (We _do_ use the last,
1059 // non-dropped frame; perhaps we should just discard that as well,
1060 // since dropped frames are expected to be rare, and it might be
1061 // better to just wait until we have a slightly more normal situation).
1062 unique_lock<mutex> lock(audio_mutex);
1063 bool adjust_rate = !dropped_frame && !is_preroll;
1064 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1065 audio_task_queue_changed.notify_one();
1067 if (dropped_frame) {
1068 // For dropped frames, increase the pts. Note that if the format changed
1069 // in the meantime, we have no way of detecting that; we just have to
1070 // assume the frame length is always the same.
1071 pts_int += length_per_frame;
1076 void Mixer::render_one_frame(int64_t duration)
1078 // Determine the time code for this frame before we start rendering.
1079 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1080 if (display_timecode_on_stdout) {
1081 printf("Timecode: '%s'\n", timecode_text.c_str());
1084 // Get the main chain from the theme, and set its state immediately.
1085 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1086 EffectChain *chain = theme_main_chain.chain;
1087 theme_main_chain.setup_chain();
1088 //theme_main_chain.chain->enable_phase_timing(true);
1090 // The theme can't (or at least shouldn't!) call connect_signal() on
1091 // each FFmpeg input, so we'll do it here.
1092 for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_signal_connections()) {
1093 conn.first->connect_signal_raw(conn.second->get_card_index());
1096 // If HDMI/SDI output is active and the user has requested auto mode,
1097 // its mode overrides the existing Y'CbCr setting for the chain.
1098 YCbCrLumaCoefficients ycbcr_output_coefficients;
1099 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1100 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1102 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1105 // TODO: Reduce the duplication against theme.cpp.
1106 YCbCrFormat output_ycbcr_format;
1107 output_ycbcr_format.chroma_subsampling_x = 1;
1108 output_ycbcr_format.chroma_subsampling_y = 1;
1109 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1110 output_ycbcr_format.full_range = false;
1111 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1112 chain->change_ycbcr_output_format(output_ycbcr_format);
1114 // Render main chain. If we're using zerocopy Quick Sync encoding
1115 // (the default case), we take an extra copy of the created outputs,
1116 // so that we can display it back to the screen later (it's less memory
1117 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1118 // Ideally, we'd like to avoid taking copies and just use the main textures
1119 // for display as well, but they're just views into VA-API memory and must be
1120 // unmapped during encoding, so we can't use them for display, unfortunately.
1121 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1122 GLuint y_copy_tex, cbcr_copy_tex = 0;
1123 GLuint y_display_tex, cbcr_display_tex;
1124 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1125 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1126 const bool is_zerocopy = video_encoder->is_zerocopy();
1128 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1129 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1130 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1132 y_display_tex = y_copy_tex;
1133 cbcr_display_tex = cbcr_copy_tex;
1135 // y_tex and cbcr_tex will be given by VideoEncoder.
1137 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1138 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1139 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1141 y_display_tex = y_tex;
1142 cbcr_display_tex = cbcr_tex;
1145 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1146 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1151 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1153 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1156 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1158 if (display_timecode_in_stream) {
1159 // Render the timecode on top.
1160 timecode_renderer->render_timecode(fbo, timecode_text);
1163 resource_pool->release_fbo(fbo);
1166 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1168 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1170 if (output_card_index != -1) {
1171 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1173 resource_pool->release_2d_texture(cbcr_full_tex);
1175 // Set the right state for the Y' and CbCr textures we use for display.
1176 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1177 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1178 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1179 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1180 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1182 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1183 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1184 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1185 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1187 RefCountedGLsync fence = video_encoder->end_frame();
1189 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1190 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1191 DisplayFrame live_frame;
1192 live_frame.chain = display_chain.get();
1193 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1194 display_input->set_texture_num(0, y_display_tex);
1195 display_input->set_texture_num(1, cbcr_display_tex);
1197 live_frame.ready_fence = fence;
1198 live_frame.input_frames = {};
1199 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1200 output_channel[OUTPUT_LIVE].output_frame(live_frame);
1202 // Set up preview and any additional channels.
1203 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1204 DisplayFrame display_frame;
1205 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1206 display_frame.chain = chain.chain;
1207 display_frame.setup_chain = chain.setup_chain;
1208 display_frame.ready_fence = fence;
1209 display_frame.input_frames = chain.input_frames;
1210 display_frame.temp_textures = {};
1211 output_channel[i].output_frame(display_frame);
1215 void Mixer::audio_thread_func()
1217 pthread_setname_np(pthread_self(), "Mixer_Audio");
1219 while (!should_quit) {
1223 unique_lock<mutex> lock(audio_mutex);
1224 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1228 task = audio_task_queue.front();
1229 audio_task_queue.pop();
1232 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1233 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1234 vector<float> samples_out = audio_mixer.get_output(
1235 task.frame_timestamp,
1237 rate_adjustment_policy);
1239 // Send the samples to the sound card, then add them to the output.
1241 alsa->write(samples_out);
1243 if (output_card_index != -1) {
1244 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1245 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1247 video_encoder->add_audio(task.pts_int, move(samples_out));
1251 void Mixer::release_display_frame(DisplayFrame *frame)
1253 for (GLuint texnum : frame->temp_textures) {
1254 resource_pool->release_2d_texture(texnum);
1256 frame->temp_textures.clear();
1257 frame->ready_fence.reset();
1258 frame->input_frames.clear();
1263 mixer_thread = thread(&Mixer::thread_func, this);
1264 audio_thread = thread(&Mixer::audio_thread_func, this);
1270 audio_task_queue_changed.notify_one();
1271 mixer_thread.join();
1272 audio_thread.join();
1275 void Mixer::transition_clicked(int transition_num)
1277 theme->transition_clicked(transition_num, pts());
1280 void Mixer::channel_clicked(int preview_num)
1282 theme->channel_clicked(preview_num);
1285 void Mixer::start_mode_scanning(unsigned card_index)
1287 assert(card_index < num_cards);
1288 if (is_mode_scanning[card_index]) {
1291 is_mode_scanning[card_index] = true;
1292 mode_scanlist[card_index].clear();
1293 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1294 mode_scanlist[card_index].push_back(mode.first);
1296 assert(!mode_scanlist[card_index].empty());
1297 mode_scanlist_index[card_index] = 0;
1298 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1299 last_mode_scan_change[card_index] = steady_clock::now();
1302 map<uint32_t, bmusb::VideoMode> Mixer::get_available_output_video_modes() const
1304 assert(desired_output_card_index != -1);
1305 unique_lock<mutex> lock(card_mutex);
1306 return cards[desired_output_card_index].output->get_available_video_modes();
1309 Mixer::OutputChannel::~OutputChannel()
1311 if (has_current_frame) {
1312 parent->release_display_frame(¤t_frame);
1314 if (has_ready_frame) {
1315 parent->release_display_frame(&ready_frame);
1319 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1321 // Store this frame for display. Remove the ready frame if any
1322 // (it was seemingly never used).
1324 unique_lock<mutex> lock(frame_mutex);
1325 if (has_ready_frame) {
1326 parent->release_display_frame(&ready_frame);
1328 ready_frame = frame;
1329 has_ready_frame = true;
1332 if (new_frame_ready_callback) {
1333 new_frame_ready_callback();
1336 // Reduce the number of callbacks by filtering duplicates. The reason
1337 // why we bother doing this is that Qt seemingly can get into a state
1338 // where its builds up an essentially unbounded queue of signals,
1339 // consuming more and more memory, and there's no good way of collapsing
1340 // user-defined signals or limiting the length of the queue.
1341 if (transition_names_updated_callback) {
1342 vector<string> transition_names = global_mixer->get_transition_names();
1343 bool changed = false;
1344 if (transition_names.size() != last_transition_names.size()) {
1347 for (unsigned i = 0; i < transition_names.size(); ++i) {
1348 if (transition_names[i] != last_transition_names[i]) {
1355 transition_names_updated_callback(transition_names);
1356 last_transition_names = transition_names;
1359 if (name_updated_callback) {
1360 string name = global_mixer->get_channel_name(channel);
1361 if (name != last_name) {
1362 name_updated_callback(name);
1366 if (color_updated_callback) {
1367 string color = global_mixer->get_channel_color(channel);
1368 if (color != last_color) {
1369 color_updated_callback(color);
1375 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1377 unique_lock<mutex> lock(frame_mutex);
1378 if (!has_current_frame && !has_ready_frame) {
1382 if (has_current_frame && has_ready_frame) {
1383 // We have a new ready frame. Toss the current one.
1384 parent->release_display_frame(¤t_frame);
1385 has_current_frame = false;
1387 if (has_ready_frame) {
1388 assert(!has_current_frame);
1389 current_frame = ready_frame;
1390 ready_frame.ready_fence.reset(); // Drop the refcount.
1391 ready_frame.input_frames.clear(); // Drop the refcounts.
1392 has_current_frame = true;
1393 has_ready_frame = false;
1396 *frame = current_frame;
1400 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1402 new_frame_ready_callback = callback;
1405 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1407 transition_names_updated_callback = callback;
1410 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1412 name_updated_callback = callback;
1415 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1417 color_updated_callback = callback;
1420 mutex RefCountedGLsync::fence_lock;