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"
43 #include "input_mapping.h"
44 #include "pbo_frame_allocator.h"
45 #include "ref_counted_gl_sync.h"
46 #include "resampling_queue.h"
48 #include "timecode_renderer.h"
49 #include "v210_converter.h"
50 #include "video_encoder.h"
55 using namespace movit;
57 using namespace std::chrono;
58 using namespace std::placeholders;
59 using namespace bmusb;
61 Mixer *global_mixer = nullptr;
62 bool uses_mlock = false;
66 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
69 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
70 input_state->buffered_frames[card_index][frame_num] =
71 input_state->buffered_frames[card_index][frame_num - 1];
73 input_state->buffered_frames[card_index][0] = { frame, field_num };
75 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
76 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
81 void ensure_texture_resolution(PBOFrameAllocator::Userdata *userdata, unsigned field, unsigned width, unsigned height, unsigned v210_width)
84 switch (userdata->pixel_format) {
85 case bmusb::PixelFormat_10BitYCbCr:
86 first = userdata->tex_v210[field] == 0 || userdata->tex_444[field] == 0;
88 case bmusb::PixelFormat_8BitYCbCr:
89 first = userdata->tex_y[field] == 0 || userdata->tex_cbcr[field] == 0;
91 case bmusb::PixelFormat_8BitRGBA:
92 first = userdata->tex_rgba[field] == 0;
99 width != userdata->last_width[field] ||
100 height != userdata->last_height[field]) {
101 // We changed resolution since last use of this texture, so we need to create
102 // a new object. Note that this each card has its own PBOFrameAllocator,
103 // we don't need to worry about these flip-flopping between resolutions.
104 switch (userdata->pixel_format) {
105 case bmusb::PixelFormat_10BitYCbCr:
106 glBindTexture(GL_TEXTURE_2D, userdata->tex_444[field]);
108 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
111 case bmusb::PixelFormat_8BitYCbCr: {
112 size_t cbcr_width = width / 2;
114 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
116 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
118 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
120 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
124 case bmusb::PixelFormat_8BitRGBA:
125 glBindTexture(GL_TEXTURE_2D, userdata->tex_rgba[field]);
127 if (global_flags.can_disable_srgb_decoder) { // See the comments in tweaked_inputs.h.
128 glTexImage2D(GL_TEXTURE_2D, 0, GL_SRGB8_ALPHA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
130 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
135 userdata->last_width[field] = width;
136 userdata->last_height[field] = height;
138 if (global_flags.ten_bit_input &&
139 (first || v210_width != userdata->last_v210_width[field])) {
140 // Same as above; we need to recreate the texture.
141 glBindTexture(GL_TEXTURE_2D, userdata->tex_v210[field]);
143 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB10_A2, v210_width, height, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, nullptr);
145 userdata->last_v210_width[field] = v210_width;
149 void upload_texture(GLuint tex, GLuint width, GLuint height, GLuint stride, bool interlaced_stride, GLenum format, GLenum type, GLintptr offset)
151 if (interlaced_stride) {
154 if (global_flags.flush_pbos) {
155 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, offset, stride * height);
159 glBindTexture(GL_TEXTURE_2D, tex);
161 if (interlaced_stride) {
162 glPixelStorei(GL_UNPACK_ROW_LENGTH, width * 2);
165 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
169 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, BUFFER_OFFSET(offset));
171 glBindTexture(GL_TEXTURE_2D, 0);
173 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
179 void QueueLengthPolicy::update_policy(unsigned queue_length)
181 if (queue_length == 0) { // Starvation.
182 if (been_at_safe_point_since_last_starvation && safe_queue_length < unsigned(global_flags.max_input_queue_frames)) {
184 fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frame(s)\n",
185 card_index, safe_queue_length);
187 frames_with_at_least_one = 0;
188 been_at_safe_point_since_last_starvation = false;
191 if (queue_length >= safe_queue_length) {
192 been_at_safe_point_since_last_starvation = true;
194 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 1) {
196 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frame(s)\n",
197 card_index, safe_queue_length);
198 frames_with_at_least_one = 0;
202 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
204 num_cards(num_cards),
205 mixer_surface(create_surface(format)),
206 h264_encoder_surface(create_surface(format)),
207 decklink_output_surface(create_surface(format)),
208 audio_mixer(num_cards)
210 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
213 // This nearly always should be true.
214 global_flags.can_disable_srgb_decoder = epoxy_has_gl_extension("GL_EXT_texture_sRGB_decode");
216 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
217 // will be halved when sampling them, and we need to compensate here.
218 movit_texel_subpixel_precision /= 2.0;
220 resource_pool.reset(new ResourcePool);
221 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
222 output_channel[i].parent = this;
223 output_channel[i].channel = i;
226 ImageFormat inout_format;
227 inout_format.color_space = COLORSPACE_sRGB;
228 inout_format.gamma_curve = GAMMA_sRGB;
230 // Matches the 4:2:0 format created by the main chain.
231 YCbCrFormat ycbcr_format;
232 ycbcr_format.chroma_subsampling_x = 2;
233 ycbcr_format.chroma_subsampling_y = 2;
234 if (global_flags.ycbcr_rec709_coefficients) {
235 ycbcr_format.luma_coefficients = YCBCR_REC_709;
237 ycbcr_format.luma_coefficients = YCBCR_REC_601;
239 ycbcr_format.full_range = false;
240 ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
241 ycbcr_format.cb_x_position = 0.0f;
242 ycbcr_format.cr_x_position = 0.0f;
243 ycbcr_format.cb_y_position = 0.5f;
244 ycbcr_format.cr_y_position = 0.5f;
246 // Display chain; shows the live output produced by the main chain (or rather, a copy of it).
247 display_chain.reset(new EffectChain(global_flags.width, global_flags.height, resource_pool.get()));
249 GLenum type = global_flags.x264_bit_depth > 8 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_BYTE;
250 display_input = new YCbCrInput(inout_format, ycbcr_format, global_flags.width, global_flags.height, YCBCR_INPUT_SPLIT_Y_AND_CBCR, type);
251 display_chain->add_input(display_input);
252 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
253 display_chain->set_dither_bits(0); // Don't bother.
254 display_chain->finalize();
256 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));
258 // Must be instantiated after VideoEncoder has initialized global_flags.use_zerocopy.
259 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
261 // Start listening for clients only once VideoEncoder has written its header, if any.
264 // First try initializing the then PCI devices, then USB, then
265 // fill up with fake cards until we have the desired number of cards.
266 unsigned num_pci_devices = 0;
267 unsigned card_index = 0;
270 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
271 if (decklink_iterator != nullptr) {
272 for ( ; card_index < num_cards; ++card_index) {
274 if (decklink_iterator->Next(&decklink) != S_OK) {
278 DeckLinkCapture *capture = new DeckLinkCapture(decklink, card_index);
279 DeckLinkOutput *output = new DeckLinkOutput(resource_pool.get(), decklink_output_surface, global_flags.width, global_flags.height, card_index);
280 output->set_device(decklink);
281 configure_card(card_index, capture, CardType::LIVE_CARD, output);
284 decklink_iterator->Release();
285 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
287 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
291 unsigned num_usb_devices = BMUSBCapture::num_cards();
292 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
293 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
294 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
295 configure_card(card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
297 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
299 unsigned num_fake_cards = 0;
300 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
301 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
302 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
305 if (num_fake_cards > 0) {
306 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
309 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
310 BMUSBCapture::start_bm_thread();
312 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
313 cards[card_index].queue_length_policy.reset(card_index);
316 chroma_subsampler.reset(new ChromaSubsampler(resource_pool.get()));
318 if (global_flags.ten_bit_input) {
319 if (!v210Converter::has_hardware_support()) {
320 fprintf(stderr, "ERROR: --ten-bit-input requires support for OpenGL compute shaders\n");
321 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
324 v210_converter.reset(new v210Converter());
326 // These are all the widths listed in the Blackmagic SDK documentation
327 // (section 2.7.3, “Display Modes”).
328 v210_converter->precompile_shader(720);
329 v210_converter->precompile_shader(1280);
330 v210_converter->precompile_shader(1920);
331 v210_converter->precompile_shader(2048);
332 v210_converter->precompile_shader(3840);
333 v210_converter->precompile_shader(4096);
335 if (global_flags.ten_bit_output) {
336 if (!v210Converter::has_hardware_support()) {
337 fprintf(stderr, "ERROR: --ten-bit-output requires support for OpenGL compute shaders\n");
338 fprintf(stderr, " (OpenGL 4.3, or GL_ARB_compute_shader + GL_ARB_shader_image_load_store).\n");
343 timecode_renderer.reset(new TimecodeRenderer(resource_pool.get(), global_flags.width, global_flags.height));
344 display_timecode_in_stream = global_flags.display_timecode_in_stream;
345 display_timecode_on_stdout = global_flags.display_timecode_on_stdout;
347 if (global_flags.enable_alsa_output) {
348 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
350 if (global_flags.output_card != -1) {
351 desired_output_card_index = global_flags.output_card;
352 set_output_card_internal(global_flags.output_card);
358 BMUSBCapture::stop_bm_thread();
360 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
362 unique_lock<mutex> lock(card_mutex);
363 cards[card_index].should_quit = true; // Unblock thread.
364 cards[card_index].new_frames_changed.notify_all();
366 cards[card_index].capture->stop_dequeue_thread();
367 if (cards[card_index].output) {
368 cards[card_index].output->end_output();
369 cards[card_index].output.reset();
373 video_encoder.reset(nullptr);
376 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, CardType card_type, DeckLinkOutput *output)
378 printf("Configuring card %d...\n", card_index);
380 CaptureCard *card = &cards[card_index];
381 if (card->capture != nullptr) {
382 card->capture->stop_dequeue_thread();
384 card->capture.reset(capture);
385 card->is_fake_capture = (card_type == CardType::FAKE_CAPTURE);
386 if (card->output.get() != output) {
387 card->output.reset(output);
390 bmusb::PixelFormat pixel_format = global_flags.ten_bit_input ? PixelFormat_10BitYCbCr : PixelFormat_8BitYCbCr;
392 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
393 if (card->frame_allocator == nullptr) {
394 card->frame_allocator.reset(new PBOFrameAllocator(pixel_format, 8 << 20, global_flags.width, global_flags.height)); // 8 MB.
396 card->capture->set_video_frame_allocator(card->frame_allocator.get());
397 if (card->surface == nullptr) {
398 card->surface = create_surface_with_same_format(mixer_surface);
400 while (!card->new_frames.empty()) card->new_frames.pop_front();
401 card->last_timecode = -1;
402 card->capture->set_pixel_format(pixel_format);
403 card->capture->configure_card();
405 // NOTE: start_bm_capture() happens in thread_func().
407 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
408 audio_mixer.reset_resampler(device);
409 audio_mixer.set_display_name(device, card->capture->get_description());
410 audio_mixer.trigger_state_changed_callback();
413 void Mixer::set_output_card_internal(int card_index)
415 // We don't really need to take card_mutex, since we're in the mixer
416 // thread and don't mess with any queues (which is the only thing that happens
417 // from other threads), but it's probably the safest in the long run.
418 unique_lock<mutex> lock(card_mutex);
419 if (output_card_index != -1) {
420 // Switch the old card from output to input.
421 CaptureCard *old_card = &cards[output_card_index];
422 old_card->output->end_output();
424 // Stop the fake card that we put into place.
425 // This needs to _not_ happen under the mutex, to avoid deadlock
426 // (delivering the last frame needs to take the mutex).
427 bmusb::CaptureInterface *fake_capture = old_card->capture.get();
429 fake_capture->stop_dequeue_thread();
431 old_card->capture = move(old_card->parked_capture);
432 old_card->is_fake_capture = false;
433 old_card->capture->start_bm_capture();
435 if (card_index != -1) {
436 CaptureCard *card = &cards[card_index];
437 bmusb::CaptureInterface *capture = card->capture.get();
438 // TODO: DeckLinkCapture::stop_dequeue_thread can actually take
439 // several seconds to complete (blocking on DisableVideoInput);
440 // see if we can maybe do it asynchronously.
442 capture->stop_dequeue_thread();
444 card->parked_capture = move(card->capture);
445 bmusb::CaptureInterface *fake_capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
446 configure_card(card_index, fake_capture, CardType::FAKE_CAPTURE, card->output.release());
447 card->queue_length_policy.reset(card_index);
448 card->capture->start_bm_capture();
449 desired_output_video_mode = output_video_mode = card->output->pick_video_mode(desired_output_video_mode);
450 card->output->start_output(desired_output_video_mode, pts_int);
452 output_card_index = card_index;
457 int unwrap_timecode(uint16_t current_wrapped, int last)
459 uint16_t last_wrapped = last & 0xffff;
460 if (current_wrapped > last_wrapped) {
461 return (last & ~0xffff) | current_wrapped;
463 return 0x10000 + ((last & ~0xffff) | current_wrapped);
469 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
470 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
471 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
473 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
474 CaptureCard *card = &cards[card_index];
476 if (is_mode_scanning[card_index]) {
477 if (video_format.has_signal) {
478 // Found a stable signal, so stop scanning.
479 is_mode_scanning[card_index] = false;
481 static constexpr double switch_time_s = 0.1; // Should be enough time for the signal to stabilize.
482 steady_clock::time_point now = steady_clock::now();
483 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
484 if (sec_since_last_switch > switch_time_s) {
485 // It isn't this mode; try the next one.
486 mode_scanlist_index[card_index]++;
487 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
488 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
489 last_mode_scan_change[card_index] = now;
494 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
495 assert(frame_length > 0);
497 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;
498 if (num_samples > OUTPUT_FREQUENCY / 10) {
499 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",
500 card_index, int(audio_frame.len), int(audio_offset),
501 timecode, int(video_frame.len), int(video_offset), video_format.id);
502 if (video_frame.owner) {
503 video_frame.owner->release_frame(video_frame);
505 if (audio_frame.owner) {
506 audio_frame.owner->release_frame(audio_frame);
511 int dropped_frames = 0;
512 if (card->last_timecode != -1) {
513 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
516 // Number of samples per frame if we need to insert silence.
517 // (Could be nonintegral, but resampling will save us then.)
518 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
520 if (dropped_frames > MAX_FPS * 2) {
521 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
522 card_index, card->last_timecode, timecode);
523 audio_mixer.reset_resampler(device);
525 } else if (dropped_frames > 0) {
526 // Insert silence as needed.
527 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
528 card_index, dropped_frames, timecode);
532 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
536 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length, audio_frame.received_timestamp);
538 // Done with the audio, so release it.
539 if (audio_frame.owner) {
540 audio_frame.owner->release_frame(audio_frame);
543 card->last_timecode = timecode;
545 size_t expected_length = video_format.stride * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom);
546 if (video_frame.len - video_offset == 0 ||
547 video_frame.len - video_offset != expected_length) {
548 if (video_frame.len != 0) {
549 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
550 card_index, video_frame.len - video_offset, expected_length);
552 if (video_frame.owner) {
553 video_frame.owner->release_frame(video_frame);
556 // Still send on the information that we _had_ a frame, even though it's corrupted,
557 // so that pts can go up accordingly.
559 unique_lock<mutex> lock(card_mutex);
560 CaptureCard::NewFrame new_frame;
561 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
562 new_frame.length = frame_length;
563 new_frame.interlaced = false;
564 new_frame.dropped_frames = dropped_frames;
565 new_frame.received_timestamp = video_frame.received_timestamp;
566 card->new_frames.push_back(move(new_frame));
567 card->new_frames_changed.notify_all();
572 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
574 unsigned num_fields = video_format.interlaced ? 2 : 1;
575 steady_clock::time_point frame_upload_start;
576 bool interlaced_stride = false;
577 if (video_format.interlaced) {
578 // Send the two fields along as separate frames; the other side will need to add
579 // a deinterlacer to actually get this right.
580 assert(video_format.height % 2 == 0);
581 video_format.height /= 2;
582 assert(frame_length % 2 == 0);
585 if (video_format.second_field_start == 1) {
586 interlaced_stride = true;
588 frame_upload_start = steady_clock::now();
590 userdata->last_interlaced = video_format.interlaced;
591 userdata->last_has_signal = video_format.has_signal;
592 userdata->last_is_connected = video_format.is_connected;
593 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
594 userdata->last_frame_rate_den = video_format.frame_rate_den;
595 RefCountedFrame frame(video_frame);
597 // Upload the textures.
598 const size_t cbcr_width = video_format.width / 2;
599 const size_t cbcr_offset = video_offset / 2;
600 const size_t y_offset = video_frame.size / 2 + video_offset / 2;
602 for (unsigned field = 0; field < num_fields; ++field) {
603 // Put the actual texture upload in a lambda that is executed in the main thread.
604 // It is entirely possible to do this in the same thread (and it might even be
605 // faster, depending on the GPU and driver), but it appears to be trickling
606 // driver bugs very easily.
608 // Note that this means we must hold on to the actual frame data in <userdata>
609 // until the upload command is run, but we hold on to <frame> much longer than that
610 // (in fact, all the way until we no longer use the texture in rendering).
611 auto upload_func = [this, field, video_format, y_offset, video_offset, cbcr_offset, cbcr_width, interlaced_stride, userdata]() {
612 unsigned field_start_line;
614 field_start_line = video_format.second_field_start;
616 field_start_line = video_format.extra_lines_top;
619 // For anything not FRAME_FORMAT_YCBCR_10BIT, v210_width will be nonsensical but not used.
620 size_t v210_width = video_format.stride / sizeof(uint32_t);
621 ensure_texture_resolution(userdata, field, video_format.width, video_format.height, v210_width);
623 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, userdata->pbo);
626 switch (userdata->pixel_format) {
627 case bmusb::PixelFormat_10BitYCbCr: {
628 size_t field_start = video_offset + video_format.stride * field_start_line;
629 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);
630 v210_converter->convert(userdata->tex_v210[field], userdata->tex_444[field], video_format.width, video_format.height);
633 case bmusb::PixelFormat_8BitYCbCr: {
634 size_t field_y_start = y_offset + video_format.width * field_start_line;
635 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
637 // Make up our own strides, since we are interleaving.
638 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);
639 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);
642 case bmusb::PixelFormat_8BitRGBA: {
643 size_t field_start = video_offset + video_format.stride * field_start_line;
644 upload_texture(userdata->tex_rgba[field], video_format.width, video_format.height, video_format.stride, interlaced_stride, GL_RGBA, GL_UNSIGNED_BYTE, field_start);
651 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
656 // Don't upload the second field as fast as we can; wait until
657 // the field time has approximately passed. (Otherwise, we could
658 // get timing jitter against the other sources, and possibly also
659 // against the video display, although the latter is not as critical.)
660 // This requires our system clock to be reasonably close to the
661 // video clock, but that's not an unreasonable assumption.
662 steady_clock::time_point second_field_start = frame_upload_start +
663 nanoseconds(frame_length * 1000000000 / TIMEBASE);
664 this_thread::sleep_until(second_field_start);
668 unique_lock<mutex> lock(card_mutex);
669 CaptureCard::NewFrame new_frame;
670 new_frame.frame = frame;
671 new_frame.length = frame_length;
672 new_frame.field = field;
673 new_frame.interlaced = video_format.interlaced;
674 new_frame.upload_func = upload_func;
675 new_frame.dropped_frames = dropped_frames;
676 new_frame.received_timestamp = video_frame.received_timestamp; // Ignore the audio timestamp.
677 card->new_frames.push_back(move(new_frame));
678 card->new_frames_changed.notify_all();
683 void Mixer::bm_hotplug_add(libusb_device *dev)
685 lock_guard<mutex> lock(hotplug_mutex);
686 hotplugged_cards.push_back(dev);
689 void Mixer::bm_hotplug_remove(unsigned card_index)
691 cards[card_index].new_frames_changed.notify_all();
694 void Mixer::thread_func()
696 pthread_setname_np(pthread_self(), "Mixer_OpenGL");
698 eglBindAPI(EGL_OPENGL_API);
699 QOpenGLContext *context = create_context(mixer_surface);
700 if (!make_current(context, mixer_surface)) {
705 // Start the actual capture. (We don't want to do it before we're actually ready
706 // to process output frames.)
707 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
708 if (int(card_index) != output_card_index) {
709 cards[card_index].capture->start_bm_capture();
713 steady_clock::time_point start, now;
714 start = steady_clock::now();
716 int stats_dropped_frames = 0;
718 while (!should_quit) {
719 if (desired_output_card_index != output_card_index) {
720 set_output_card_internal(desired_output_card_index);
722 if (output_card_index != -1 &&
723 desired_output_video_mode != output_video_mode) {
724 DeckLinkOutput *output = cards[output_card_index].output.get();
725 output->end_output();
726 desired_output_video_mode = output_video_mode = output->pick_video_mode(desired_output_video_mode);
727 output->start_output(desired_output_video_mode, pts_int);
730 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
731 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
733 bool master_card_is_output;
734 unsigned master_card_index;
735 if (output_card_index != -1) {
736 master_card_is_output = true;
737 master_card_index = output_card_index;
739 master_card_is_output = false;
740 master_card_index = theme->map_signal(master_clock_channel);
741 assert(master_card_index < num_cards);
744 OutputFrameInfo output_frame_info = get_one_frame_from_each_card(master_card_index, master_card_is_output, new_frames, has_new_frame);
745 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);
746 stats_dropped_frames += output_frame_info.dropped_frames;
748 handle_hotplugged_cards();
750 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
751 if (card_index == master_card_index || !has_new_frame[card_index]) {
754 if (new_frames[card_index].frame->len == 0) {
755 ++new_frames[card_index].dropped_frames;
757 if (new_frames[card_index].dropped_frames > 0) {
758 printf("Card %u dropped %d frames before this\n",
759 card_index, int(new_frames[card_index].dropped_frames));
763 // If the first card is reporting a corrupted or otherwise dropped frame,
764 // just increase the pts (skipping over this frame) and don't try to compute anything new.
765 if (!master_card_is_output && new_frames[master_card_index].frame->len == 0) {
766 ++stats_dropped_frames;
767 pts_int += new_frames[master_card_index].length;
771 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
772 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
775 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
776 assert(new_frame->frame != nullptr);
777 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
780 // The new texture might need uploading before use.
781 if (new_frame->upload_func) {
782 new_frame->upload_func();
783 new_frame->upload_func = nullptr;
787 int64_t frame_duration = output_frame_info.frame_duration;
788 render_one_frame(frame_duration);
790 pts_int += frame_duration;
792 now = steady_clock::now();
793 double elapsed = duration<double>(now - start).count();
794 if (frame_num % 100 == 0) {
795 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
796 frame_num, stats_dropped_frames, elapsed, frame_num / elapsed,
797 1e3 * elapsed / frame_num);
798 // chain->print_phase_timing();
800 // Check our memory usage, to see if we are close to our mlockall()
801 // limit (if at all set).
803 if (getrusage(RUSAGE_SELF, &used) == -1) {
804 perror("getrusage(RUSAGE_SELF)");
810 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
811 perror("getrlimit(RLIMIT_MEMLOCK)");
815 if (limit.rlim_cur == 0) {
816 printf(", using %ld MB memory (locked)",
817 long(used.ru_maxrss / 1024));
819 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
820 long(used.ru_maxrss / 1024),
821 long(limit.rlim_cur / 1048576),
822 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
825 printf(", using %ld MB memory (not locked)",
826 long(used.ru_maxrss / 1024));
833 if (should_cut.exchange(false)) { // Test and clear.
834 video_encoder->do_cut(frame_num);
838 // Reset every 100 frames, so that local variations in frame times
839 // (especially for the first few frames, when the shaders are
840 // compiled etc.) don't make it hard to measure for the entire
841 // remaining duration of the program.
842 if (frame == 10000) {
850 resource_pool->clean_context();
853 bool Mixer::input_card_is_master_clock(unsigned card_index, unsigned master_card_index) const
855 if (output_card_index != -1) {
856 // The output card (ie., cards[output_card_index].output) is the master clock,
857 // so no input card (ie., cards[card_index].capture) is.
860 return (card_index == master_card_index);
863 void Mixer::trim_queue(CaptureCard *card, unsigned card_index)
865 // Count the number of frames in the queue, including any frames
866 // we dropped. It's hard to know exactly how we should deal with
867 // dropped (corrupted) input frames; they don't help our goal of
868 // avoiding starvation, but they still add to the problem of latency.
869 // Since dropped frames is going to mean a bump in the signal anyway,
870 // we err on the side of having more stable latency instead.
871 unsigned queue_length = 0;
872 for (const CaptureCard::NewFrame &frame : card->new_frames) {
873 queue_length += frame.dropped_frames + 1;
875 card->queue_length_policy.update_policy(queue_length);
877 // If needed, drop frames until the queue is below the safe limit.
878 // We prefer to drop from the head, because all else being equal,
879 // we'd like more recent frames (less latency).
880 unsigned dropped_frames = 0;
881 while (queue_length > card->queue_length_policy.get_safe_queue_length()) {
882 assert(!card->new_frames.empty());
883 assert(queue_length > card->new_frames.front().dropped_frames);
884 queue_length -= card->new_frames.front().dropped_frames;
886 if (queue_length <= card->queue_length_policy.get_safe_queue_length()) {
887 // No need to drop anything.
891 card->new_frames.pop_front();
892 card->new_frames_changed.notify_all();
898 if (dropped_frames > 0) {
899 fprintf(stderr, "Card %u dropped %u frame(s) to keep latency down.\n",
900 card_index, dropped_frames);
906 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])
908 OutputFrameInfo output_frame_info;
910 unique_lock<mutex> lock(card_mutex, defer_lock);
911 if (master_card_is_output) {
912 // Clocked to the output, so wait for it to be ready for the next frame.
913 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);
916 // Wait for the master card to have a new frame.
917 // TODO: Add a timeout.
918 output_frame_info.is_preroll = false;
920 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(); });
923 if (master_card_is_output) {
924 handle_hotplugged_cards();
925 } else if (cards[master_card_index].new_frames.empty()) {
926 // We were woken up, but not due to a new frame. Deal with it
928 assert(cards[master_card_index].capture->get_disconnected());
929 handle_hotplugged_cards();
933 if (!master_card_is_output) {
934 output_frame_info.frame_timestamp =
935 cards[master_card_index].new_frames.front().received_timestamp;
938 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
939 CaptureCard *card = &cards[card_index];
940 if (input_card_is_master_clock(card_index, master_card_index)) {
941 // We don't use the queue length policy for the master card,
942 // but we will if it stops being the master. Thus, clear out
943 // the policy in case we switch in the future.
944 card->queue_length_policy.reset(card_index);
945 assert(!card->new_frames.empty());
947 trim_queue(card, card_index);
949 if (!card->new_frames.empty()) {
950 new_frames[card_index] = move(card->new_frames.front());
951 has_new_frame[card_index] = true;
952 card->new_frames.pop_front();
953 card->new_frames_changed.notify_all();
957 if (!master_card_is_output) {
958 output_frame_info.dropped_frames = new_frames[master_card_index].dropped_frames;
959 output_frame_info.frame_duration = new_frames[master_card_index].length;
962 // This might get off by a fractional sample when changing master card
963 // between ones with different frame rates, but that's fine.
964 int num_samples_times_timebase = OUTPUT_FREQUENCY * output_frame_info.frame_duration + fractional_samples;
965 output_frame_info.num_samples = num_samples_times_timebase / TIMEBASE;
966 fractional_samples = num_samples_times_timebase % TIMEBASE;
967 assert(output_frame_info.num_samples >= 0);
969 return output_frame_info;
972 void Mixer::handle_hotplugged_cards()
974 // Check for cards that have been disconnected since last frame.
975 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
976 CaptureCard *card = &cards[card_index];
977 if (card->capture->get_disconnected()) {
978 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
979 FakeCapture *capture = new FakeCapture(global_flags.width, global_flags.height, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
980 configure_card(card_index, capture, CardType::FAKE_CAPTURE, /*output=*/nullptr);
981 card->queue_length_policy.reset(card_index);
982 card->capture->start_bm_capture();
986 // Check for cards that have been connected since last frame.
987 vector<libusb_device *> hotplugged_cards_copy;
989 lock_guard<mutex> lock(hotplug_mutex);
990 swap(hotplugged_cards, hotplugged_cards_copy);
992 for (libusb_device *new_dev : hotplugged_cards_copy) {
993 // Look for a fake capture card where we can stick this in.
994 int free_card_index = -1;
995 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
996 if (cards[card_index].is_fake_capture) {
997 free_card_index = card_index;
1002 if (free_card_index == -1) {
1003 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
1004 libusb_unref_device(new_dev);
1006 // BMUSBCapture takes ownership.
1007 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
1008 CaptureCard *card = &cards[free_card_index];
1009 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
1010 configure_card(free_card_index, capture, CardType::LIVE_CARD, /*output=*/nullptr);
1011 card->queue_length_policy.reset(free_card_index);
1012 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
1013 capture->start_bm_capture();
1019 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)
1021 // Resample the audio as needed, including from previously dropped frames.
1022 assert(num_cards > 0);
1023 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
1024 const bool dropped_frame = (frame_num != dropped_frames);
1026 // Signal to the audio thread to process this frame.
1027 // Note that if the frame is a dropped frame, we signal that
1028 // we don't want to use this frame as base for adjusting
1029 // the resampler rate. The reason for this is that the timing
1030 // of these frames is often way too late; they typically don't
1031 // “arrive” before we synthesize them. Thus, we could end up
1032 // in a situation where we have inserted e.g. five audio frames
1033 // into the queue before we then start pulling five of them
1034 // back out. This makes ResamplingQueue overestimate the delay,
1035 // causing undue resampler changes. (We _do_ use the last,
1036 // non-dropped frame; perhaps we should just discard that as well,
1037 // since dropped frames are expected to be rare, and it might be
1038 // better to just wait until we have a slightly more normal situation).
1039 unique_lock<mutex> lock(audio_mutex);
1040 bool adjust_rate = !dropped_frame && !is_preroll;
1041 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate, frame_timestamp});
1042 audio_task_queue_changed.notify_one();
1044 if (dropped_frame) {
1045 // For dropped frames, increase the pts. Note that if the format changed
1046 // in the meantime, we have no way of detecting that; we just have to
1047 // assume the frame length is always the same.
1048 pts_int += length_per_frame;
1053 void Mixer::render_one_frame(int64_t duration)
1055 // Determine the time code for this frame before we start rendering.
1056 string timecode_text = timecode_renderer->get_timecode_text(double(pts_int) / TIMEBASE, frame_num);
1057 if (display_timecode_on_stdout) {
1058 printf("Timecode: '%s'\n", timecode_text.c_str());
1061 // Get the main chain from the theme, and set its state immediately.
1062 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), global_flags.width, global_flags.height, input_state);
1063 EffectChain *chain = theme_main_chain.chain;
1064 theme_main_chain.setup_chain();
1065 //theme_main_chain.chain->enable_phase_timing(true);
1067 // If HDMI/SDI output is active and the user has requested auto mode,
1068 // its mode overrides the existing Y'CbCr setting for the chain.
1069 YCbCrLumaCoefficients ycbcr_output_coefficients;
1070 if (global_flags.ycbcr_auto_coefficients && output_card_index != -1) {
1071 ycbcr_output_coefficients = cards[output_card_index].output->preferred_ycbcr_coefficients();
1073 ycbcr_output_coefficients = global_flags.ycbcr_rec709_coefficients ? YCBCR_REC_709 : YCBCR_REC_601;
1076 // TODO: Reduce the duplication against theme.cpp.
1077 YCbCrFormat output_ycbcr_format;
1078 output_ycbcr_format.chroma_subsampling_x = 1;
1079 output_ycbcr_format.chroma_subsampling_y = 1;
1080 output_ycbcr_format.luma_coefficients = ycbcr_output_coefficients;
1081 output_ycbcr_format.full_range = false;
1082 output_ycbcr_format.num_levels = 1 << global_flags.x264_bit_depth;
1083 chain->change_ycbcr_output_format(output_ycbcr_format);
1085 // Render main chain. If we're using zerocopy Quick Sync encoding
1086 // (the default case), we take an extra copy of the created outputs,
1087 // so that we can display it back to the screen later (it's less memory
1088 // bandwidth than writing and reading back an RGBA texture, even at 16-bit).
1089 // Ideally, we'd like to avoid taking copies and just use the main textures
1090 // for display as well, but they're just views into VA-API memory and must be
1091 // unmapped during encoding, so we can't use them for display, unfortunately.
1092 GLuint y_tex, cbcr_full_tex, cbcr_tex;
1093 GLuint y_copy_tex, cbcr_copy_tex = 0;
1094 GLuint y_display_tex, cbcr_display_tex;
1095 GLenum y_type = (global_flags.x264_bit_depth > 8) ? GL_R16 : GL_R8;
1096 GLenum cbcr_type = (global_flags.x264_bit_depth > 8) ? GL_RG16 : GL_RG8;
1097 const bool is_zerocopy = video_encoder->is_zerocopy();
1099 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1100 y_copy_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1101 cbcr_copy_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1103 y_display_tex = y_copy_tex;
1104 cbcr_display_tex = cbcr_copy_tex;
1106 // y_tex and cbcr_tex will be given by VideoEncoder.
1108 cbcr_full_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width, global_flags.height);
1109 y_tex = resource_pool->create_2d_texture(y_type, global_flags.width, global_flags.height);
1110 cbcr_tex = resource_pool->create_2d_texture(cbcr_type, global_flags.width / 2, global_flags.height / 2);
1112 y_display_tex = y_tex;
1113 cbcr_display_tex = cbcr_tex;
1116 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1117 bool got_frame = video_encoder->begin_frame(pts_int + av_delay, duration, ycbcr_output_coefficients, theme_main_chain.input_frames, &y_tex, &cbcr_tex);
1122 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, y_copy_tex);
1124 fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex);
1127 chain->render_to_fbo(fbo, global_flags.width, global_flags.height);
1129 if (display_timecode_in_stream) {
1130 // Render the timecode on top.
1131 timecode_renderer->render_timecode(fbo, timecode_text);
1134 resource_pool->release_fbo(fbo);
1137 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex, cbcr_copy_tex);
1139 chroma_subsampler->subsample_chroma(cbcr_full_tex, global_flags.width, global_flags.height, cbcr_tex);
1141 if (output_card_index != -1) {
1142 cards[output_card_index].output->send_frame(y_tex, cbcr_full_tex, ycbcr_output_coefficients, theme_main_chain.input_frames, pts_int, duration);
1144 resource_pool->release_2d_texture(cbcr_full_tex);
1146 // Set the right state for the Y' and CbCr textures we use for display.
1147 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1148 glBindTexture(GL_TEXTURE_2D, y_display_tex);
1149 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1150 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1151 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1153 glBindTexture(GL_TEXTURE_2D, cbcr_display_tex);
1154 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1155 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1156 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1158 RefCountedGLsync fence = video_encoder->end_frame();
1160 // The live frame pieces the Y'CbCr texture copies back into RGB and displays them.
1161 // It owns y_display_tex and cbcr_display_tex now (whichever textures they are).
1162 DisplayFrame live_frame;
1163 live_frame.chain = display_chain.get();
1164 live_frame.setup_chain = [this, y_display_tex, cbcr_display_tex]{
1165 display_input->set_texture_num(0, y_display_tex);
1166 display_input->set_texture_num(1, cbcr_display_tex);
1168 live_frame.ready_fence = fence;
1169 live_frame.input_frames = {};
1170 live_frame.temp_textures = { y_display_tex, cbcr_display_tex };
1171 output_channel[OUTPUT_LIVE].output_frame(live_frame);
1173 // Set up preview and any additional channels.
1174 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
1175 DisplayFrame display_frame;
1176 Theme::Chain chain = theme->get_chain(i, pts(), global_flags.width, global_flags.height, input_state); // FIXME: dimensions
1177 display_frame.chain = chain.chain;
1178 display_frame.setup_chain = chain.setup_chain;
1179 display_frame.ready_fence = fence;
1180 display_frame.input_frames = chain.input_frames;
1181 display_frame.temp_textures = {};
1182 output_channel[i].output_frame(display_frame);
1186 void Mixer::audio_thread_func()
1188 pthread_setname_np(pthread_self(), "Mixer_Audio");
1190 while (!should_quit) {
1194 unique_lock<mutex> lock(audio_mutex);
1195 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
1199 task = audio_task_queue.front();
1200 audio_task_queue.pop();
1203 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
1204 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
1205 vector<float> samples_out = audio_mixer.get_output(
1206 task.frame_timestamp,
1208 rate_adjustment_policy);
1210 // Send the samples to the sound card, then add them to the output.
1212 alsa->write(samples_out);
1214 if (output_card_index != -1) {
1215 const int64_t av_delay = lrint(global_flags.audio_queue_length_ms * 0.001 * TIMEBASE); // Corresponds to the delay in ResamplingQueue.
1216 cards[output_card_index].output->send_audio(task.pts_int + av_delay, samples_out);
1218 video_encoder->add_audio(task.pts_int, move(samples_out));
1222 void Mixer::release_display_frame(DisplayFrame *frame)
1224 for (GLuint texnum : frame->temp_textures) {
1225 resource_pool->release_2d_texture(texnum);
1227 frame->temp_textures.clear();
1228 frame->ready_fence.reset();
1229 frame->input_frames.clear();
1234 mixer_thread = thread(&Mixer::thread_func, this);
1235 audio_thread = thread(&Mixer::audio_thread_func, this);
1241 audio_task_queue_changed.notify_one();
1242 mixer_thread.join();
1243 audio_thread.join();
1246 void Mixer::transition_clicked(int transition_num)
1248 theme->transition_clicked(transition_num, pts());
1251 void Mixer::channel_clicked(int preview_num)
1253 theme->channel_clicked(preview_num);
1256 void Mixer::start_mode_scanning(unsigned card_index)
1258 assert(card_index < num_cards);
1259 if (is_mode_scanning[card_index]) {
1262 is_mode_scanning[card_index] = true;
1263 mode_scanlist[card_index].clear();
1264 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1265 mode_scanlist[card_index].push_back(mode.first);
1267 assert(!mode_scanlist[card_index].empty());
1268 mode_scanlist_index[card_index] = 0;
1269 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1270 last_mode_scan_change[card_index] = steady_clock::now();
1273 map<uint32_t, bmusb::VideoMode> Mixer::get_available_output_video_modes() const
1275 assert(desired_output_card_index != -1);
1276 unique_lock<mutex> lock(card_mutex);
1277 return cards[desired_output_card_index].output->get_available_video_modes();
1280 Mixer::OutputChannel::~OutputChannel()
1282 if (has_current_frame) {
1283 parent->release_display_frame(¤t_frame);
1285 if (has_ready_frame) {
1286 parent->release_display_frame(&ready_frame);
1290 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1292 // Store this frame for display. Remove the ready frame if any
1293 // (it was seemingly never used).
1295 unique_lock<mutex> lock(frame_mutex);
1296 if (has_ready_frame) {
1297 parent->release_display_frame(&ready_frame);
1299 ready_frame = frame;
1300 has_ready_frame = true;
1303 if (new_frame_ready_callback) {
1304 new_frame_ready_callback();
1307 // Reduce the number of callbacks by filtering duplicates. The reason
1308 // why we bother doing this is that Qt seemingly can get into a state
1309 // where its builds up an essentially unbounded queue of signals,
1310 // consuming more and more memory, and there's no good way of collapsing
1311 // user-defined signals or limiting the length of the queue.
1312 if (transition_names_updated_callback) {
1313 vector<string> transition_names = global_mixer->get_transition_names();
1314 bool changed = false;
1315 if (transition_names.size() != last_transition_names.size()) {
1318 for (unsigned i = 0; i < transition_names.size(); ++i) {
1319 if (transition_names[i] != last_transition_names[i]) {
1326 transition_names_updated_callback(transition_names);
1327 last_transition_names = transition_names;
1330 if (name_updated_callback) {
1331 string name = global_mixer->get_channel_name(channel);
1332 if (name != last_name) {
1333 name_updated_callback(name);
1337 if (color_updated_callback) {
1338 string color = global_mixer->get_channel_color(channel);
1339 if (color != last_color) {
1340 color_updated_callback(color);
1346 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1348 unique_lock<mutex> lock(frame_mutex);
1349 if (!has_current_frame && !has_ready_frame) {
1353 if (has_current_frame && has_ready_frame) {
1354 // We have a new ready frame. Toss the current one.
1355 parent->release_display_frame(¤t_frame);
1356 has_current_frame = false;
1358 if (has_ready_frame) {
1359 assert(!has_current_frame);
1360 current_frame = ready_frame;
1361 ready_frame.ready_fence.reset(); // Drop the refcount.
1362 ready_frame.input_frames.clear(); // Drop the refcounts.
1363 has_current_frame = true;
1364 has_ready_frame = false;
1367 *frame = current_frame;
1371 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1373 new_frame_ready_callback = callback;
1376 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1378 transition_names_updated_callback = callback;
1381 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1383 name_updated_callback = callback;
1386 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1388 color_updated_callback = callback;
1391 mutex RefCountedGLsync::fence_lock;