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_8BitRGBA:
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_8BitRGBA:
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_RGBA, GL_UNSIGNED_BYTE, nullptr);
131 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 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 = epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode");
217 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
218 // will be halved when sampling them, and we need to compensate here.
219 movit_texel_subpixel_precision /= 2.0;
221 resource_pool.reset(new ResourcePool);
222 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
223 output_channel[i].parent = this;
224 output_channel[i].channel = i;
227 ImageFormat inout_format;
228 inout_format.color_space = COLORSPACE_sRGB;
229 inout_format.gamma_curve = GAMMA_sRGB;
231 // Matches the 4:2:0 format created by the main chain.
232 YCbCrFormat ycbcr_format;
233 ycbcr_format.chroma_subsampling_x = 2;
234 ycbcr_format.chroma_subsampling_y = 2;
235 if (global_flags.ycbcr_rec709_coefficients) {
236 ycbcr_format.luma_coefficients = YCBCR_REC_709;
238 ycbcr_format.luma_coefficients = YCBCR_REC_601;
240 ycbcr_format.full_range = false;
241 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
242 ycbcr_format.cb_x_position = 0.0f;
243 ycbcr_format.cr_x_position = 0.0f;
244 ycbcr_format.cb_y_position = 0.5f;
245 ycbcr_format.cr_y_position = 0.5f;
247 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
248 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
250 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
251 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
252 display_chain->add_input(display_input);
253 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
254 display_chain->set_dither_bits(0); // Don't bother.
255 display_chain->finalize();
257 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));
259 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
260 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
262 // Start listening for clients only once VideoEncoder has written its header, if any.
265 // First try initializing the then PCI devices, then USB, then
266 // fill up with fake cards until we have the desired number of cards.
267 unsigned num_pci_devices = 0;
268 unsigned card_index = 0;
271 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
272 if (decklink_iterator != nullptr) {
273 for ( ; card_index < num_cards; ++card_index) {
275 if (decklink_iterator->Next(&decklink) != S_OK) {
279 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
280 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
281 output->set_device(decklink);
282 configure_card(card_index, capture, CardType::LIVE_CARD, output);
285 decklink_iterator->Release();
286 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
288 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
292 unsigned num_usb_devices = BMUSBCapture::num_cards();
293 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
294 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
295 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
296 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
298 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
300 unsigned num_fake_cards = 0;
301 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
302 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
303 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
306 if (num_fake_cards > 0) {
307 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
310 // Initialize all video inputs the theme asked for. Note that these are
311 // all put _after_ the regular cards, which stop at <num_cards> - 1.
312 std::vector<FFmpegCapture *> video_inputs = theme->get_video_inputs();
313 for (unsigned video_card_index = 0; video_card_index < video_inputs.size(); ++card_index, ++video_card_index) {
314 if (card_index >= MAX_VIDEO_CARDS) {
315 fprintf(stderr, "ERROR: Not enough card slots available for the videos the theme requested.\n");
318 configure_card(card_index, video_inputs[video_card_index], CardType::FFMPEG_INPUT, /*output=*/nullptr);
319 video_inputs[video_card_index]->set_card_index(card_index);
321 num_video_inputs = video_inputs.size();
323 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
324 BMUSBCapture::start_bm_thread();
326 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
327 cards[card_index].queue_length_policy.reset(card_index);
330 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
332 if (global_flags.ten_bit_input) {
333 if (!v210Converter::has_hardware_support()) {
334 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
335 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
338 v210_converter.reset(new v210Converter());
340 // These are all the widths listed in the Blackmagic SDK documentation
341 // (section 2.7.3, “Display Modes”).
342 v210_converter->precompile_shader(720);
343 v210_converter->precompile_shader(1280);
344 v210_converter->precompile_shader(1920);
345 v210_converter->precompile_shader(2048);
346 v210_converter->precompile_shader(3840);
347 v210_converter->precompile_shader(4096);
349 if (global_flags.ten_bit_output) {
350 if (!v210Converter::has_hardware_support()) {
351 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
352 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
357 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
358 display_timecode_in_stream = global_flags.display_timecode_in_stream;
359 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
361 if (global_flags.enable_alsa_output) {
362 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
364 if (global_flags.output_card != -1) {
365 desired_output_card_index = global_flags.output_card;
366 set_output_card_internal(global_flags.output_card);
372 BMUSBCapture::stop_bm_thread();
374 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
376 unique_lock<mutex> lock(card_mutex);
377 cards[card_index].should_quit = true; // Unblock thread.
378 cards[card_index].new_frames_changed.notify_all();
380 cards[card_index].capture->stop_dequeue_thread();
381 if (cards[card_index].output) {
382 cards[card_index].output->end_output();
383 cards[card_index].output.reset();
387 video_encoder.reset(nullptr);
390 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
392 printf("Configuring card %d...\n", card_index);
394 CaptureCard *card = &cards[card_index];
395 if (card->capture != nullptr) {
396 card->capture->stop_dequeue_thread();
398 card->capture.reset(capture);
399 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
400 if (card->output.get() != output) {
401 card->output.reset(output);
404 bmusb::PixelFormat pixel_format;
405 if (card_type == CardType::FFMPEG_INPUT) {
406 pixel_format = bmusb::PixelFormat_8BitRGBA;
407 } else if (global_flags.ten_bit_input) {
408 pixel_format = PixelFormat_10BitYCbCr;
410 pixel_format = PixelFormat_8BitYCbCr;
413 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
414 if (card->frame_allocator == nullptr) {
415 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
417 card->capture->set_video_frame_allocator(card->frame_allocator.get());
418 if (card->surface == nullptr) {
419 card->surface = create_surface_with_same_format(mixer_surface);
421 while (!card->new_frames.empty()) card->new_frames.pop_front();
422 card->last_timecode = -1;
423 card->capture->set_pixel_format(pixel_format);
424 card->capture->configure_card();
426 // NOTE: start_bm_capture() happens in thread_func().
428 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
429 audio_mixer.reset_resampler(device);
430 audio_mixer.set_display_name(device, card->capture->get_description());
431 audio_mixer.trigger_state_changed_callback();
434 void Mixer::set_output_card_internal(int card_index)
436 // We don't really need to take card_mutex, since we're in the mixer
437 // thread and don't mess with any queues (which is the only thing that happens
438 // from other threads), but it's probably the safest in the long run.
439 unique_lock<mutex> lock(card_mutex);
440 if (output_card_index != -1) {
441 // Switch the old card from output to input.
442 CaptureCard *old_card = &cards[output_card_index];
443 old_card->output->end_output();
445 // Stop the fake card that we put into place.
446 // This needs to _not_ happen under the mutex, to avoid deadlock
447 // (delivering the last frame needs to take the mutex).
448 bmusb::CaptureInterface *fake_capture = old_card->capture.get();
450 fake_capture->stop_dequeue_thread();
452 old_card->capture = move(old_card->parked_capture);
453 old_card->is_fake_capture = false;
454 old_card->capture->start_bm_capture();
456 if (card_index != -1) {
457 CaptureCard *card = &cards[card_index];
458 bmusb::CaptureInterface *capture = card->capture.get();
459 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
460 // several seconds to complete (blocking on DisableVideoInput);
461 // see if we can maybe do it asynchronously.
463 capture->stop_dequeue_thread();
465 card->parked_capture = move(card->capture);
466 bmusb::CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
467 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
468 card->queue_length_policy.reset(card_index);
469 card->capture->start_bm_capture();
470 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
471 card->output->start_output(desired_output_video_mode, pts_int);
473 output_card_index = card_index;
478 int unwrap_timecode(uint16_t current_wrapped, int last)
480 uint16_t last_wrapped = last & 0xffff;
481 if (current_wrapped > last_wrapped) {
482 return (last & ~0xffff) | current_wrapped;
484 return 0x10000 + ((last & ~0xffff) | current_wrapped);
490 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
491 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
492 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
494 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
495 CaptureCard *card = &cards[card_index];
497 if (is_mode_scanning[card_index]) {
498 if (video_format.has_signal) {
499 // Found a stable signal, so stop scanning.
500 is_mode_scanning[card_index] = false;
502 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
503 steady_clock::time_point now = steady_clock::now();
504 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
505 if (sec_since_last_switch > switch_time_s) {
506 // It isn't this mode; try the next one.
507 mode_scanlist_index[card_index]++;
508 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
509 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
510 last_mode_scan_change[card_index] = now;
515 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
516 assert(frame_length > 0);
518 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;
519 if (num_samples > OUTPUT_FREQUENCY / 10) {
520 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",
521 card_index, int(audio_frame.len), int(audio_offset),
522 timecode, int(video_frame.len), int(video_offset), video_format.id);
523 if (video_frame.owner) {
524 video_frame.owner->release_frame(video_frame);
526 if (audio_frame.owner) {
527 audio_frame.owner->release_frame(audio_frame);
532 int dropped_frames = 0;
533 if (card->last_timecode != -1) {
534 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
537 // Number of samples per frame if we need to insert silence.
538 // (Could be nonintegral, but resampling will save us then.)
539 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
541 if (dropped_frames > MAX_FPS * 2) {
542 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
543 card_index, card->last_timecode, timecode);
544 audio_mixer.reset_resampler(device);
546 } else if (dropped_frames > 0) {
547 // Insert silence as needed.
548 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
549 card_index, dropped_frames, timecode);
553 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
557 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
559 // Done with the audio, so release it.
560 if (audio_frame.owner) {
561 audio_frame.owner->release_frame(audio_frame);
564 card->last_timecode = timecode;
566 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
567 if (video_frame.len - video_offset == 0 ||
568 video_frame.len - video_offset != expected_length) {
569 if (video_frame.len != 0) {
570 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
571 card_index, video_frame.len - video_offset, expected_length);
573 if (video_frame.owner) {
574 video_frame.owner->release_frame(video_frame);
577 // Still send on the information that we _had_ a frame, even though it's corrupted,
578 // so that pts can go up accordingly.
580 unique_lock<mutex> lock(card_mutex);
581 CaptureCard::NewFrame new_frame;
582 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
583 new_frame.length = frame_length;
584 new_frame.interlaced = false;
585 new_frame.dropped_frames = dropped_frames;
586 new_frame.received_timestamp = video_frame.received_timestamp;
587 card->new_frames.push_back(move(new_frame));
588 card->new_frames_changed.notify_all();
593 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
595 unsigned num_fields = video_format.interlaced ? 2 : 1;
596 steady_clock::time_point frame_upload_start;
597 bool interlaced_stride = false;
598 if (video_format.interlaced) {
599 // Send the two fields along as separate frames; the other side will need to add
600 // a deinterlacer to actually get this right.
601 assert(video_format.height % 2 == 0);
602 video_format.height /= 2;
603 assert(frame_length % 2 == 0);
606 if (video_format.second_field_start == 1) {
607 interlaced_stride = true;
609 frame_upload_start = steady_clock::now();
611 userdata->last_interlaced = video_format.interlaced;
612 userdata->last_has_signal = video_format.has_signal;
613 userdata->last_is_connected = video_format.is_connected;
614 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
615 userdata->last_frame_rate_den = video_format.frame_rate_den;
616 RefCountedFrame frame(video_frame);
618 // Upload the textures.
619 const size_t cbcr_width = video_format.width / 2;
620 const size_t cbcr_offset = video_offset / 2;
621 const size_t y_offset = video_frame.size / 2 + video_offset / 2;
623 for (unsigned field = 0; field < num_fields; ++field) {
624 // Put the actual texture upload in a lambda that is executed in the main thread.
625 // It is entirely possible to do this in the same thread (and it might even be
626 // faster, depending on the GPU and driver), but it appears to be trickling
627 // driver bugs very easily.
629 // Note that this means we must hold on to the actual frame data in <userdata>
630 // until the upload command is run, but we hold on to <frame> much longer than that
631 // (in fact, all the way until we no longer use the texture in rendering).
632 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, interlaced_stride, userdata]() {
633 unsigned field_start_line;
635 field_start_line = video_format.second_field_start;
637 field_start_line = video_format.extra_lines_top;
640 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
641 size_t v210_width = video_format.stride / sizeof(uint32_t);
642 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, v210_width);
644 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
647 switch (userdata->pixel_format) {
648 case bmusb::PixelFormat_10BitYCbCr: {
649 size_t field_start = video_offset + video_format.stride * field_start_line;
650 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);
651 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
654 case bmusb::PixelFormat_8BitYCbCr: {
655 size_t field_y_start = y_offset + video_format.width * field_start_line;
656 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
658 // Make up our own strides, since we are interleaving.
659 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);
660 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);
663 case bmusb::PixelFormat_8BitRGBA: {
664 size_t field_start = video_offset + video_format.stride * field_start_line;
665 upload_texture(userdata->tex_rgba[field], video_format.width, video_format.height, video_format.stride, interlaced_stride, GL_RGBA, GL_UNSIGNED_BYTE, field_start);
672 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
677 // Don't upload the second field as fast as we can; wait until
678 // the field time has approximately passed. (Otherwise, we could
679 // get timing jitter against the other sources, and possibly also
680 // against the video display, although the latter is not as critical.)
681 // This requires our system clock to be reasonably close to the
682 // video clock, but that's not an unreasonable assumption.
683 steady_clock::time_point second_field_start = frame_upload_start +
684 nanoseconds(frame_length * 1000000000 / TIMEBASE);
685 this_thread::sleep_until(second_field_start);
689 unique_lock<mutex> lock(card_mutex);
690 CaptureCard::NewFrame new_frame;
691 new_frame.frame = frame;
692 new_frame.length = frame_length;
693 new_frame.field = field;
694 new_frame.interlaced = video_format.interlaced;
695 new_frame.upload_func = upload_func;
696 new_frame.dropped_frames = dropped_frames;
697 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
698 card->new_frames.push_back(move(new_frame));
699 card->new_frames_changed.notify_all();
704 void Mixer::bm_hotplug_add(libusb_device *dev)
706 lock_guard<mutex> lock(hotplug_mutex);
707 hotplugged_cards.push_back(dev);
710 void Mixer::bm_hotplug_remove(unsigned card_index)
712 cards[card_index].new_frames_changed.notify_all();
715 void Mixer::thread_func()
717 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
719 eglBindAPI(EGL_OPENGL_API);
720 QOpenGLContext *context = create_context(mixer_surface);
721 if (!make_current(context, mixer_surface)) {
726 // Start the actual capture. (We don't want to do it before we're actually ready
727 // to process output frames.)
728 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
729 if (int(card_index) != output_card_index) {
730 cards[card_index].capture->start_bm_capture();
734 steady_clock::time_point start, now;
735 start = steady_clock::now();
737 int stats_dropped_frames = 0;
739 while (!should_quit) {
740 if (desired_output_card_index != output_card_index) {
741 set_output_card_internal(desired_output_card_index);
743 if (output_card_index != -1 &&
744 desired_output_video_mode != output_video_mode) {
745 DeckLinkOutput *output = cards[output_card_index].output.get();
746 output->end_output();
747 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
748 output->start_output(desired_output_video_mode, pts_int);
751 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
752 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
754 bool master_card_is_output;
755 unsigned master_card_index;
756 if (output_card_index != -1) {
757 master_card_is_output = true;
758 master_card_index = output_card_index;
760 master_card_is_output = false;
761 master_card_index = theme->map_signal(master_clock_channel);
762 assert(master_card_index < num_cards);
765 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
766 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);
767 stats_dropped_frames += output_frame_info.dropped_frames;
769 handle_hotplugged_cards();
771 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
772 if (card_index == master_card_index || !has_new_frame[card_index]) {
775 if (new_frames[card_index].frame->len == 0) {
776 ++new_frames[card_index].dropped_frames;
778 if (new_frames[card_index].dropped_frames > 0) {
779 printf("Card %u dropped %d frames before this\n",
780 card_index, int(new_frames[card_index].dropped_frames));
784 // If the first card is reporting a corrupted or otherwise dropped frame,
785 // just increase the pts (skipping over this frame) and don't try to compute anything new.
786 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
787 ++stats_dropped_frames;
788 pts_int += new_frames[master_card_index].length;
792 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
793 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
796 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
797 assert(new_frame->frame != nullptr);
798 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
801 // The new texture might need uploading before use.
802 if (new_frame->upload_func) {
803 new_frame->upload_func();
804 new_frame->upload_func = nullptr;
808 int64_t frame_duration = output_frame_info.frame_duration;
809 render_one_frame(frame_duration);
811 pts_int += frame_duration;
813 now = steady_clock::now();
814 double elapsed = duration<double>(now - start).count();
815 if (frame_num % 100 == 0) {
816 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
817 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
818 1e3 * elapsed / frame_num);
819 // chain->print_phase_timing();
821 // Check our memory usage, to see if we are close to our mlockall()
822 // limit (if at all set).
824 if (getrusage(RUSAGE_SELF, &used) == -1) {
825 perror("getrusage(RUSAGE_SELF)");
831 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
832 perror("getrlimit(RLIMIT_MEMLOCK)");
836 if (limit.rlim_cur == 0) {
837 printf(", using %ld MB memory (locked)",
838 long(used.ru_maxrss / 1024));
840 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
841 long(used.ru_maxrss / 1024),
842 long(limit.rlim_cur / 1048576),
843 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
846 printf(", using %ld MB memory (not locked)",
847 long(used.ru_maxrss / 1024));
854 if (should_cut.exchange(false)) { // Test and clear.
855 video_encoder->do_cut(frame_num);
859 // Reset every 100 frames, so that local variations in frame times
860 // (especially for the first few frames, when the shaders are
861 // compiled etc.) don't make it hard to measure for the entire
862 // remaining duration of the program.
863 if (frame == 10000) {
871 resource_pool->clean_context();
874 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
876 if (output_card_index != -1) {
877 // The output card (ie., cards[output_card_index].output) is the master clock,
878 // so no input card (ie., cards[card_index].capture) is.
881 return (card_index == master_card_index);
884 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
886 // Count the number of frames in the queue, including any frames
887 // we dropped. It's hard to know exactly how we should deal with
888 // dropped (corrupted) input frames; they don't help our goal of
889 // avoiding starvation, but they still add to the problem of latency.
890 // Since dropped frames is going to mean a bump in the signal anyway,
891 // we err on the side of having more stable latency instead.
892 unsigned queue_length = 0;
893 for (const CaptureCard::NewFrame &frame : card->new_frames) {
894 queue_length += frame.dropped_frames + 1;
896 card->queue_length_policy.update_policy(queue_length);
898 // If needed, drop frames until the queue is below the safe limit.
899 // We prefer to drop from the head, because all else being equal,
900 // we'd like more recent frames (less latency).
901 unsigned dropped_frames = 0;
902 while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
903 assert(!card->new_frames.empty());
904 assert(queue_length > card->new_frames.front().dropped_frames);
905 queue_length -= card->new_frames.front().dropped_frames;
907 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
908 // No need to drop anything.
912 card->new_frames.pop_front();
913 card->new_frames_changed.notify_all();
919 if (dropped_frames > 0) {
920 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
921 card_index, dropped_frames);
927 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])
929 OutputFrameInfo output_frame_info;
931 unique_lock<mutex> lock(card_mutex, defer_lock);
932 if (master_card_is_output) {
933 // Clocked to the output, so wait for it to be ready for the next frame.
934 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);
937 // Wait for the master card to have a new frame.
938 // TODO: Add a timeout.
939 output_frame_info.is_preroll = false;
941 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(); });
944 if (master_card_is_output) {
945 handle_hotplugged_cards();
946 } else if (cards[master_card_index].new_frames.empty()) {
947 // We were woken up, but not due to a new frame. Deal with it
949 assert(cards[master_card_index].capture->get_disconnected());
950 handle_hotplugged_cards();
954 if (!master_card_is_output) {
955 output_frame_info.frame_timestamp =
956 cards[master_card_index].new_frames.front().received_timestamp;
959 for (unsigned card_index = 0; card_index < num_cards + num_video_inputs; ++card_index) {
960 CaptureCard *card = &cards[card_index];
961 if (input_card_is_master_clock(card_index, master_card_index)) {
962 // We don't use the queue length policy for the master card,
963 // but we will if it stops being the master. Thus, clear out
964 // the policy in case we switch in the future.
965 card->queue_length_policy.reset(card_index);
966 assert(!card->new_frames.empty());
968 trim_queue(card, card_index);
970 if (!card->new_frames.empty()) {
971 new_frames[card_index] = move(card->new_frames.front());
972 has_new_frame[card_index] = true;
973 card->new_frames.pop_front();
974 card->new_frames_changed.notify_all();
978 if (!master_card_is_output) {
979 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
980 output_frame_info.frame_duration = new_frames[master_card_index].length;
983 // This might get off by a fractional sample when changing master card
984 // between ones with different frame rates, but that's fine.
985 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
986 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
987 fractional_samples = num_samples_times_timebase % TIMEBASE;
988 assert(output_frame_info.num_samples >= 0);
990 return output_frame_info;
993 void Mixer::handle_hotplugged_cards()
995 // Check for cards that have been disconnected since last frame.
996 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
997 CaptureCard *card = &cards[card_index];
998 if (card->capture->get_disconnected()) {
999 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
1000 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
1001 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
1002 card->queue_length_policy.reset(card_index);
1003 card->capture->start_bm_capture();
1007 // Check for cards that have been connected since last frame.
1008 vector<libusb_device *> hotplugged_cards_copy;
1010 lock_guard<mutex> lock(hotplug_mutex);
1011 swap(hotplugged_cards, hotplugged_cards_copy);
1013 for (libusb_device *new_dev : hotplugged_cards_copy) {
1014 // Look for a fake capture card where we can stick this in.
1015 int free_card_index = -1;
1016 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
1017 if (cards[card_index].is_fake_capture) {
1018 free_card_index = card_index;
1023 if (free_card_index == -1) {
1024 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1025 libusb_unref_device(new_dev);
1027 // BMUSBCapture takes ownership.
1028 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1029 CaptureCard *card = &cards[free_card_index];
1030 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1031 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1032 card->queue_length_policy.reset(free_card_index);
1033 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1034 capture->start_bm_capture();
1040 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)
1042 // Resample the audio as needed, including from previously dropped frames.
1043 assert(num_cards > 0);
1044 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1045 const bool dropped_frame = (frame_num != dropped_frames);
1047 // Signal to the audio thread to process this frame.
1048 // Note that if the frame is a dropped frame, we signal that
1049 // we don't want to use this frame as base for adjusting
1050 // the resampler rate. The reason for this is that the timing
1051 // of these frames is often way too late; they typically don't
1052 // “arrive” before we synthesize them. Thus, we could end up
1053 // in a situation where we have inserted e.g. five audio frames
1054 // into the queue before we then start pulling five of them
1055 // back out. This makes ResamplingQueue overestimate the delay,
1056 // causing undue resampler changes. (We _do_ use the last,
1057 // non-dropped frame; perhaps we should just discard that as well,
1058 // since dropped frames are expected to be rare, and it might be
1059 // better to just wait until we have a slightly more normal situation).
1060 unique_lock<mutex> lock(audio_mutex);
1061 bool adjust_rate = !dropped_frame && !is_preroll;
1062 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1063 audio_task_queue_changed.notify_one();
1065 if (dropped_frame) {
1066 // For dropped frames, increase the pts. Note that if the format changed
1067 // in the meantime, we have no way of detecting that; we just have to
1068 // assume the frame length is always the same.
1069 pts_int += length_per_frame;
1074 void Mixer::render_one_frame(int64_t duration)
1076 // Determine the time code for this frame before we start rendering.
1077 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1078 if (display_timecode_on_stdout) {
1079 printf("Timecode: '%s'\n", timecode_text.c_str());
1082 // Get the main chain from the theme, and set its state immediately.
1083 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1084 EffectChain *chain = theme_main_chain.chain;
1085 theme_main_chain.setup_chain();
1086 //theme_main_chain.chain->enable_phase_timing(true);
1088 // The theme can't (or at least shouldn't!) call connect_signal() on
1089 // each FFmpeg input, so we'll do it here.
1090 for (const pair<LiveInputWrapper *, FFmpegCapture *> &conn : theme->get_signal_connections()) {
1091 conn.first->connect_signal_raw(conn.second->get_card_index());
1094 // If HDMI/SDI output is active and the user has requested auto mode,
1095 // its mode overrides the existing Y'CbCr setting for the chain.
1096 YCbCrLumaCoefficients ycbcr_output_coefficients;
1097 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1098 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1100 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1103 // TODO: Reduce the duplication against theme.cpp.
1104 YCbCrFormat output_ycbcr_format;
1105 output_ycbcr_format.chroma_subsampling_x = 1;
1106 output_ycbcr_format.chroma_subsampling_y = 1;
1107 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1108 output_ycbcr_format.full_range = false;
1109 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1110 chain->change_ycbcr_output_format(output_ycbcr_format);
1112 // Render main chain. If we're using zerocopy Quick Sync encoding
1113 // (the default case), we take an extra copy of the created outputs,
1114 // so that we can display it back to the screen later (it's less memory
1115 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1116 // Ideally, we'd like to avoid taking copies and just use the main textures
1117 // for display as well, but they're just views into VA-API memory and must be
1118 // unmapped during encoding, so we can't use them for display, unfortunately.
1119 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1120 GLuint y_copy_tex, cbcr_copy_tex = 0;
1121 GLuint y_display_tex, cbcr_display_tex;
1122 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1123 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1124 const bool is_zerocopy = video_encoder->is_zerocopy();
1126 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1127 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1128 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1130 y_display_tex = y_copy_tex;
1131 cbcr_display_tex = cbcr_copy_tex;
1133 // y_tex and cbcr_tex will be given by VideoEncoder.
1135 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1136 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1137 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1139 y_display_tex = y_tex;
1140 cbcr_display_tex = cbcr_tex;
1143 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1144 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1149 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1151 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1154 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1156 if (display_timecode_in_stream) {
1157 // Render the timecode on top.
1158 timecode_renderer->render_timecode(fbo, timecode_text);
1161 resource_pool->release_fbo(fbo);
1164 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1166 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1168 if (output_card_index != -1) {
1169 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1171 resource_pool->release_2d_texture(cbcr_full_tex);
1173 // Set the right state for the Y' and CbCr textures we use for display.
1174 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1175 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1176 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1177 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1178 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1180 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1181 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1182 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1183 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1185 RefCountedGLsync fence = video_encoder->end_frame();
1187 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1188 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1189 DisplayFrame live_frame;
1190 live_frame.chain = display_chain.get();
1191 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1192 display_input->set_texture_num(0, y_display_tex);
1193 display_input->set_texture_num(1, cbcr_display_tex);
1195 live_frame.ready_fence = fence;
1196 live_frame.input_frames = {};
1197 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1198 output_channel[OUTPUT_LIVE].output_frame(live_frame);
1200 // Set up preview and any additional channels.
1201 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1202 DisplayFrame display_frame;
1203 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1204 display_frame.chain = chain.chain;
1205 display_frame.setup_chain = chain.setup_chain;
1206 display_frame.ready_fence = fence;
1207 display_frame.input_frames = chain.input_frames;
1208 display_frame.temp_textures = {};
1209 output_channel[i].output_frame(display_frame);
1213 void Mixer::audio_thread_func()
1215 pthread_setname_np(pthread_self(), "Mixer_Audio");
1217 while (!should_quit) {
1221 unique_lock<mutex> lock(audio_mutex);
1222 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1226 task = audio_task_queue.front();
1227 audio_task_queue.pop();
1230 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1231 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1232 vector<float> samples_out = audio_mixer.get_output(
1233 task.frame_timestamp,
1235 rate_adjustment_policy);
1237 // Send the samples to the sound card, then add them to the output.
1239 alsa->write(samples_out);
1241 if (output_card_index != -1) {
1242 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1243 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1245 video_encoder->add_audio(task.pts_int, move(samples_out));
1249 void Mixer::release_display_frame(DisplayFrame *frame)
1251 for (GLuint texnum : frame->temp_textures) {
1252 resource_pool->release_2d_texture(texnum);
1254 frame->temp_textures.clear();
1255 frame->ready_fence.reset();
1256 frame->input_frames.clear();
1261 mixer_thread = thread(&Mixer::thread_func, this);
1262 audio_thread = thread(&Mixer::audio_thread_func, this);
1268 audio_task_queue_changed.notify_one();
1269 mixer_thread.join();
1270 audio_thread.join();
1273 void Mixer::transition_clicked(int transition_num)
1275 theme->transition_clicked(transition_num, pts());
1278 void Mixer::channel_clicked(int preview_num)
1280 theme->channel_clicked(preview_num);
1283 void Mixer::start_mode_scanning(unsigned card_index)
1285 assert(card_index < num_cards);
1286 if (is_mode_scanning[card_index]) {
1289 is_mode_scanning[card_index] = true;
1290 mode_scanlist[card_index].clear();
1291 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1292 mode_scanlist[card_index].push_back(mode.first);
1294 assert(!mode_scanlist[card_index].empty());
1295 mode_scanlist_index[card_index] = 0;
1296 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1297 last_mode_scan_change[card_index] = steady_clock::now();
1300 map<uint32_t, bmusb::VideoMode> Mixer::get_available_output_video_modes() const
1302 assert(desired_output_card_index != -1);
1303 unique_lock<mutex> lock(card_mutex);
1304 return cards[desired_output_card_index].output->get_available_video_modes();
1307 Mixer::OutputChannel::~OutputChannel()
1309 if (has_current_frame) {
1310 parent->release_display_frame(¤t_frame);
1312 if (has_ready_frame) {
1313 parent->release_display_frame(&ready_frame);
1317 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1319 // Store this frame for display. Remove the ready frame if any
1320 // (it was seemingly never used).
1322 unique_lock<mutex> lock(frame_mutex);
1323 if (has_ready_frame) {
1324 parent->release_display_frame(&ready_frame);
1326 ready_frame = frame;
1327 has_ready_frame = true;
1330 if (new_frame_ready_callback) {
1331 new_frame_ready_callback();
1334 // Reduce the number of callbacks by filtering duplicates. The reason
1335 // why we bother doing this is that Qt seemingly can get into a state
1336 // where its builds up an essentially unbounded queue of signals,
1337 // consuming more and more memory, and there's no good way of collapsing
1338 // user-defined signals or limiting the length of the queue.
1339 if (transition_names_updated_callback) {
1340 vector<string> transition_names = global_mixer->get_transition_names();
1341 bool changed = false;
1342 if (transition_names.size() != last_transition_names.size()) {
1345 for (unsigned i = 0; i < transition_names.size(); ++i) {
1346 if (transition_names[i] != last_transition_names[i]) {
1353 transition_names_updated_callback(transition_names);
1354 last_transition_names = transition_names;
1357 if (name_updated_callback) {
1358 string name = global_mixer->get_channel_name(channel);
1359 if (name != last_name) {
1360 name_updated_callback(name);
1364 if (color_updated_callback) {
1365 string color = global_mixer->get_channel_color(channel);
1366 if (color != last_color) {
1367 color_updated_callback(color);
1373 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1375 unique_lock<mutex> lock(frame_mutex);
1376 if (!has_current_frame && !has_ready_frame) {
1380 if (has_current_frame && has_ready_frame) {
1381 // We have a new ready frame. Toss the current one.
1382 parent->release_display_frame(¤t_frame);
1383 has_current_frame = false;
1385 if (has_ready_frame) {
1386 assert(!has_current_frame);
1387 current_frame = ready_frame;
1388 ready_frame.ready_fence.reset(); // Drop the refcount.
1389 ready_frame.input_frames.clear(); // Drop the refcounts.
1390 has_current_frame = true;
1391 has_ready_frame = false;
1394 *frame = current_frame;
1398 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1400 new_frame_ready_callback = callback;
1403 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1405 transition_names_updated_callback = callback;
1408 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1410 name_updated_callback = callback;
1413 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1415 color_updated_callback = callback;
1418 mutex RefCountedGLsync::fence_lock;