8 #include <movit/effect_chain.h>
9 #include <movit/effect_util.h>
10 #include <movit/flat_input.h>
11 #include <movit/image_format.h>
12 #include <movit/init.h>
13 #include <movit/resource_pool.h>
14 #include <movit/util.h>
23 #include <condition_variable>
31 #include <arpa/inet.h>
33 #include <sys/resource.h>
35 #include "bmusb/bmusb.h"
36 #include "bmusb/fake_capture.h"
38 #include "decklink_capture.h"
41 #include "video_encoder.h"
42 #include "pbo_frame_allocator.h"
43 #include "ref_counted_gl_sync.h"
48 using namespace movit;
50 using namespace std::chrono;
51 using namespace std::placeholders;
52 using namespace bmusb;
54 Mixer *global_mixer = nullptr;
55 bool uses_mlock = false;
59 void convert_fixed24_to_fp32(float *dst, size_t out_channels, const uint8_t *src, size_t in_channels, size_t num_samples)
61 assert(in_channels >= out_channels);
62 for (size_t i = 0; i < num_samples; ++i) {
63 for (size_t j = 0; j < out_channels; ++j) {
67 uint32_t s = s1 | (s1 << 8) | (s2 << 16) | (s3 << 24);
68 dst[i * out_channels + j] = int(s) * (1.0f / 2147483648.0f);
70 src += 3 * (in_channels - out_channels);
74 void convert_fixed32_to_fp32(float *dst, size_t out_channels, const uint8_t *src, size_t in_channels, size_t num_samples)
76 assert(in_channels >= out_channels);
77 for (size_t i = 0; i < num_samples; ++i) {
78 for (size_t j = 0; j < out_channels; ++j) {
79 int32_t s = le32toh(*(int32_t *)src);
80 dst[i * out_channels + j] = s * (1.0f / 2147483648.0f);
83 src += 4 * (in_channels - out_channels);
87 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
90 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
91 input_state->buffered_frames[card_index][frame_num] =
92 input_state->buffered_frames[card_index][frame_num - 1];
94 input_state->buffered_frames[card_index][0] = { frame, field_num };
96 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
97 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
104 void QueueLengthPolicy::update_policy(int queue_length)
106 if (queue_length < 0) { // Starvation.
107 if (been_at_safe_point_since_last_starvation && safe_queue_length < 5) {
109 fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frames\n",
110 card_index, safe_queue_length);
112 frames_with_at_least_one = 0;
113 been_at_safe_point_since_last_starvation = false;
116 if (queue_length > 0) {
117 if (queue_length >= int(safe_queue_length)) {
118 been_at_safe_point_since_last_starvation = true;
120 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 0) {
122 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frames\n",
123 card_index, safe_queue_length);
124 frames_with_at_least_one = 0;
127 frames_with_at_least_one = 0;
131 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
133 num_cards(num_cards),
134 mixer_surface(create_surface(format)),
135 h264_encoder_surface(create_surface(format)),
136 correlation(OUTPUT_FREQUENCY),
137 level_compressor(OUTPUT_FREQUENCY),
138 limiter(OUTPUT_FREQUENCY),
139 compressor(OUTPUT_FREQUENCY)
141 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
144 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
145 // will be halved when sampling them, and we need to compensate here.
146 movit_texel_subpixel_precision /= 2.0;
148 resource_pool.reset(new ResourcePool);
149 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
150 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
151 output_channel[i].parent = this;
152 output_channel[i].channel = i;
155 ImageFormat inout_format;
156 inout_format.color_space = COLORSPACE_sRGB;
157 inout_format.gamma_curve = GAMMA_sRGB;
159 // Display chain; shows the live output produced by the main chain (its RGBA version).
160 display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
162 display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT); // FIXME: GL_UNSIGNED_BYTE is really wrong.
163 display_chain->add_input(display_input);
164 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
165 display_chain->set_dither_bits(0); // Don't bother.
166 display_chain->finalize();
168 video_encoder.reset(new VideoEncoder(resource_pool.get(), h264_encoder_surface, global_flags.va_display, WIDTH, HEIGHT, &httpd));
170 // Start listening for clients only once VideoEncoder has written its header, if any.
173 // First try initializing the then PCI devices, then USB, then
174 // fill up with fake cards until we have the desired number of cards.
175 unsigned num_pci_devices = 0;
176 unsigned card_index = 0;
179 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
180 if (decklink_iterator != nullptr) {
181 for ( ; card_index < num_cards; ++card_index) {
183 if (decklink_iterator->Next(&decklink) != S_OK) {
187 configure_card(card_index, new DeckLinkCapture(decklink, card_index), /*is_fake_capture=*/false);
190 decklink_iterator->Release();
191 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
193 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
196 unsigned num_usb_devices = BMUSBCapture::num_cards();
197 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
198 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
199 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
200 configure_card(card_index, capture, /*is_fake_capture=*/false);
202 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
204 unsigned num_fake_cards = 0;
205 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
206 FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
207 configure_card(card_index, capture, /*is_fake_capture=*/true);
210 if (num_fake_cards > 0) {
211 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
214 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
215 BMUSBCapture::start_bm_thread();
217 for (card_index = 0; card_index < num_cards; ++card_index) {
218 cards[card_index].queue_length_policy.reset(card_index);
219 cards[card_index].capture->start_bm_capture();
222 // Set up stuff for NV12 conversion.
225 string cbcr_vert_shader =
228 "in vec2 position; \n"
229 "in vec2 texcoord; \n"
231 "uniform vec2 foo_chroma_offset_0; \n"
235 " // The result of glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0) is: \n"
237 " // 2.000 0.000 0.000 -1.000 \n"
238 " // 0.000 2.000 0.000 -1.000 \n"
239 " // 0.000 0.000 -2.000 -1.000 \n"
240 " // 0.000 0.000 0.000 1.000 \n"
241 " gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0); \n"
242 " vec2 flipped_tc = texcoord; \n"
243 " tc0 = flipped_tc + foo_chroma_offset_0; \n"
245 string cbcr_frag_shader =
248 "uniform sampler2D cbcr_tex; \n"
249 "out vec4 FragColor; \n"
251 " FragColor = texture(cbcr_tex, tc0); \n"
253 vector<string> frag_shader_outputs;
254 cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader, frag_shader_outputs);
261 cbcr_vbo = generate_vbo(2, GL_FLOAT, sizeof(vertices), vertices);
262 cbcr_position_attribute_index = glGetAttribLocation(cbcr_program_num, "position");
263 cbcr_texcoord_attribute_index = glGetAttribLocation(cbcr_program_num, "texcoord");
265 r128.init(2, OUTPUT_FREQUENCY);
268 locut.init(FILTER_HPF, 2);
270 set_locut_enabled(global_flags.locut_enabled);
271 set_gain_staging_db(global_flags.initial_gain_staging_db);
272 set_gain_staging_auto(global_flags.gain_staging_auto);
273 set_compressor_enabled(global_flags.compressor_enabled);
274 set_limiter_enabled(global_flags.limiter_enabled);
275 set_final_makeup_gain_auto(global_flags.final_makeup_gain_auto);
277 // hlen=16 is pretty low quality, but we use quite a bit of CPU otherwise,
278 // and there's a limit to how important the peak meter is.
279 peak_resampler.setup(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY * 4, /*num_channels=*/2, /*hlen=*/16, /*frel=*/1.0);
281 if (global_flags.enable_alsa_output) {
282 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
288 resource_pool->release_glsl_program(cbcr_program_num);
289 glDeleteBuffers(1, &cbcr_vbo);
290 BMUSBCapture::stop_bm_thread();
292 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
294 unique_lock<mutex> lock(bmusb_mutex);
295 cards[card_index].should_quit = true; // Unblock thread.
296 cards[card_index].new_frames_changed.notify_all();
298 cards[card_index].capture->stop_dequeue_thread();
301 video_encoder.reset(nullptr);
304 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, bool is_fake_capture)
306 printf("Configuring card %d...\n", card_index);
308 CaptureCard *card = &cards[card_index];
309 if (card->capture != nullptr) {
310 card->capture->stop_dequeue_thread();
311 delete card->capture;
313 card->capture = capture;
314 card->is_fake_capture = is_fake_capture;
315 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
316 if (card->frame_allocator == nullptr) {
317 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, WIDTH, HEIGHT)); // 8 MB.
319 card->capture->set_video_frame_allocator(card->frame_allocator.get());
320 if (card->surface == nullptr) {
321 card->surface = create_surface_with_same_format(mixer_surface);
324 unique_lock<mutex> lock(cards[card_index].audio_mutex);
325 card->resampling_queue.reset(new ResamplingQueue(card_index, OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
327 while (!card->new_frames.empty()) card->new_frames.pop();
328 card->fractional_samples = 0;
329 card->last_timecode = -1;
330 card->next_local_pts = 0;
331 card->capture->configure_card();
337 int unwrap_timecode(uint16_t current_wrapped, int last)
339 uint16_t last_wrapped = last & 0xffff;
340 if (current_wrapped > last_wrapped) {
341 return (last & ~0xffff) | current_wrapped;
343 return 0x10000 + ((last & ~0xffff) | current_wrapped);
347 float find_peak(const float *samples, size_t num_samples)
349 float m = fabs(samples[0]);
350 for (size_t i = 1; i < num_samples; ++i) {
351 m = max(m, fabs(samples[i]));
356 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
358 size_t num_samples = in.size() / 2;
359 out_l->resize(num_samples);
360 out_r->resize(num_samples);
362 const float *inptr = in.data();
363 float *lptr = &(*out_l)[0];
364 float *rptr = &(*out_r)[0];
365 for (size_t i = 0; i < num_samples; ++i) {
373 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
374 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
375 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
377 CaptureCard *card = &cards[card_index];
379 if (is_mode_scanning[card_index]) {
380 if (video_format.has_signal) {
381 // Found a stable signal, so stop scanning.
382 is_mode_scanning[card_index] = false;
384 static constexpr double switch_time_s = 0.5; // Should be enough time for the signal to stabilize.
385 steady_clock::time_point now = steady_clock::now();
386 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
387 if (sec_since_last_switch > switch_time_s) {
388 // It isn't this mode; try the next one.
389 mode_scanlist_index[card_index]++;
390 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
391 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
392 last_mode_scan_change[card_index] = now;
397 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
398 assert(frame_length > 0);
400 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;
401 if (num_samples > OUTPUT_FREQUENCY / 10) {
402 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",
403 card_index, int(audio_frame.len), int(audio_offset),
404 timecode, int(video_frame.len), int(video_offset), video_format.id);
405 if (video_frame.owner) {
406 video_frame.owner->release_frame(video_frame);
408 if (audio_frame.owner) {
409 audio_frame.owner->release_frame(audio_frame);
414 int64_t local_pts = card->next_local_pts;
415 int dropped_frames = 0;
416 if (card->last_timecode != -1) {
417 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
420 // Convert the audio to stereo fp32 and add it.
422 audio.resize(num_samples * 2);
423 switch (audio_format.bits_per_sample) {
425 assert(num_samples == 0);
428 convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, audio_format.num_channels, num_samples);
431 convert_fixed32_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, audio_format.num_channels, num_samples);
434 fprintf(stderr, "Cannot handle audio with %u bits per sample\n", audio_format.bits_per_sample);
440 unique_lock<mutex> lock(card->audio_mutex);
442 // Number of samples per frame if we need to insert silence.
443 // (Could be nonintegral, but resampling will save us then.)
444 int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
446 if (dropped_frames > MAX_FPS * 2) {
447 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
448 card_index, card->last_timecode, timecode);
449 card->resampling_queue.reset(new ResamplingQueue(card_index, OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
451 } else if (dropped_frames > 0) {
452 // Insert silence as needed.
453 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
454 card_index, dropped_frames, timecode);
455 vector<float> silence(silence_samples * 2, 0.0f);
456 for (int i = 0; i < dropped_frames; ++i) {
457 card->resampling_queue->add_input_samples(local_pts / double(TIMEBASE), silence.data(), silence_samples);
458 // Note that if the format changed in the meantime, we have
459 // no way of detecting that; we just have to assume the frame length
460 // is always the same.
461 local_pts += frame_length;
464 if (num_samples == 0) {
465 audio.resize(silence_samples * 2);
466 num_samples = silence_samples;
468 card->resampling_queue->add_input_samples(local_pts / double(TIMEBASE), audio.data(), num_samples);
469 card->next_local_pts = local_pts + frame_length;
472 card->last_timecode = timecode;
474 // Done with the audio, so release it.
475 if (audio_frame.owner) {
476 audio_frame.owner->release_frame(audio_frame);
479 size_t expected_length = video_format.width * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom) * 2;
480 if (video_frame.len - video_offset == 0 ||
481 video_frame.len - video_offset != expected_length) {
482 if (video_frame.len != 0) {
483 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
484 card_index, video_frame.len - video_offset, expected_length);
486 if (video_frame.owner) {
487 video_frame.owner->release_frame(video_frame);
490 // Still send on the information that we _had_ a frame, even though it's corrupted,
491 // so that pts can go up accordingly.
493 unique_lock<mutex> lock(bmusb_mutex);
494 CaptureCard::NewFrame new_frame;
495 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
496 new_frame.length = frame_length;
497 new_frame.interlaced = false;
498 new_frame.dropped_frames = dropped_frames;
499 card->new_frames.push(move(new_frame));
500 card->new_frames_changed.notify_all();
505 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
507 unsigned num_fields = video_format.interlaced ? 2 : 1;
508 steady_clock::time_point frame_upload_start;
509 if (video_format.interlaced) {
510 // Send the two fields along as separate frames; the other side will need to add
511 // a deinterlacer to actually get this right.
512 assert(video_format.height % 2 == 0);
513 video_format.height /= 2;
514 assert(frame_length % 2 == 0);
517 frame_upload_start = steady_clock::now();
519 userdata->last_interlaced = video_format.interlaced;
520 userdata->last_has_signal = video_format.has_signal;
521 userdata->last_is_connected = video_format.is_connected;
522 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
523 userdata->last_frame_rate_den = video_format.frame_rate_den;
524 RefCountedFrame frame(video_frame);
526 // Upload the textures.
527 size_t cbcr_width = video_format.width / 2;
528 size_t cbcr_offset = video_offset / 2;
529 size_t y_offset = video_frame.size / 2 + video_offset / 2;
531 for (unsigned field = 0; field < num_fields; ++field) {
532 // Put the actual texture upload in a lambda that is executed in the main thread.
533 // It is entirely possible to do this in the same thread (and it might even be
534 // faster, depending on the GPU and driver), but it appears to be trickling
535 // driver bugs very easily.
537 // Note that this means we must hold on to the actual frame data in <userdata>
538 // until the upload command is run, but we hold on to <frame> much longer than that
539 // (in fact, all the way until we no longer use the texture in rendering).
540 auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, userdata]() {
541 unsigned field_start_line = (field == 1) ? video_format.second_field_start : video_format.extra_lines_top + field * (video_format.height + 22);
543 if (userdata->tex_y[field] == 0 ||
544 userdata->tex_cbcr[field] == 0 ||
545 video_format.width != userdata->last_width[field] ||
546 video_format.height != userdata->last_height[field]) {
547 // We changed resolution since last use of this texture, so we need to create
548 // a new object. Note that this each card has its own PBOFrameAllocator,
549 // we don't need to worry about these flip-flopping between resolutions.
550 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
552 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, video_format.height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
554 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
556 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, video_format.width, video_format.height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
558 userdata->last_width[field] = video_format.width;
559 userdata->last_height[field] = video_format.height;
562 GLuint pbo = userdata->pbo;
564 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
567 size_t field_y_start = y_offset + video_format.width * field_start_line;
568 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
570 if (global_flags.flush_pbos) {
571 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_y_start, video_format.width * video_format.height);
573 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_cbcr_start, cbcr_width * video_format.height * sizeof(uint16_t));
577 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
579 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, video_format.height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_cbcr_start));
581 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
583 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, video_format.width, video_format.height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_y_start));
585 glBindTexture(GL_TEXTURE_2D, 0);
587 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
592 // Don't upload the second field as fast as we can; wait until
593 // the field time has approximately passed. (Otherwise, we could
594 // get timing jitter against the other sources, and possibly also
595 // against the video display, although the latter is not as critical.)
596 // This requires our system clock to be reasonably close to the
597 // video clock, but that's not an unreasonable assumption.
598 steady_clock::time_point second_field_start = frame_upload_start +
599 nanoseconds(frame_length * 1000000000 / TIMEBASE);
600 this_thread::sleep_until(second_field_start);
604 unique_lock<mutex> lock(bmusb_mutex);
605 CaptureCard::NewFrame new_frame;
606 new_frame.frame = frame;
607 new_frame.length = frame_length;
608 new_frame.field = field;
609 new_frame.interlaced = video_format.interlaced;
610 new_frame.upload_func = upload_func;
611 new_frame.dropped_frames = dropped_frames;
612 card->new_frames.push(move(new_frame));
613 card->new_frames_changed.notify_all();
618 void Mixer::bm_hotplug_add(libusb_device *dev)
620 lock_guard<mutex> lock(hotplug_mutex);
621 hotplugged_cards.push_back(dev);
624 void Mixer::bm_hotplug_remove(unsigned card_index)
626 cards[card_index].new_frames_changed.notify_all();
629 void Mixer::thread_func()
631 eglBindAPI(EGL_OPENGL_API);
632 QOpenGLContext *context = create_context(mixer_surface);
633 if (!make_current(context, mixer_surface)) {
638 steady_clock::time_point start, now;
639 start = steady_clock::now();
642 int stats_dropped_frames = 0;
644 while (!should_quit) {
645 CaptureCard::NewFrame new_frames[MAX_CARDS];
646 bool has_new_frame[MAX_CARDS] = { false };
647 int num_samples[MAX_CARDS] = { 0 };
649 unsigned master_card_index = theme->map_signal(master_clock_channel);
650 assert(master_card_index < num_cards);
652 get_one_frame_from_each_card(master_card_index, new_frames, has_new_frame, num_samples);
653 schedule_audio_resampling_tasks(new_frames[master_card_index].dropped_frames, num_samples[master_card_index], new_frames[master_card_index].length);
654 stats_dropped_frames += new_frames[master_card_index].dropped_frames;
655 send_audio_level_callback();
657 handle_hotplugged_cards();
659 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
660 if (card_index == master_card_index || !has_new_frame[card_index]) {
663 if (new_frames[card_index].frame->len == 0) {
664 ++new_frames[card_index].dropped_frames;
666 if (new_frames[card_index].dropped_frames > 0) {
667 printf("Card %u dropped %d frames before this\n",
668 card_index, int(new_frames[card_index].dropped_frames));
672 // If the first card is reporting a corrupted or otherwise dropped frame,
673 // just increase the pts (skipping over this frame) and don't try to compute anything new.
674 if (new_frames[master_card_index].frame->len == 0) {
675 ++stats_dropped_frames;
676 pts_int += new_frames[master_card_index].length;
680 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
681 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
684 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
685 assert(new_frame->frame != nullptr);
686 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
689 // The new texture might need uploading before use.
690 if (new_frame->upload_func) {
691 new_frame->upload_func();
692 new_frame->upload_func = nullptr;
696 int64_t frame_duration = new_frames[master_card_index].length;
697 render_one_frame(frame_duration);
699 pts_int += frame_duration;
701 now = steady_clock::now();
702 double elapsed = duration<double>(now - start).count();
703 if (frame % 100 == 0) {
704 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
705 frame, stats_dropped_frames, elapsed, frame / elapsed,
706 1e3 * elapsed / frame);
707 // chain->print_phase_timing();
709 // Check our memory usage, to see if we are close to our mlockall()
710 // limit (if at all set).
712 if (getrusage(RUSAGE_SELF, &used) == -1) {
713 perror("getrusage(RUSAGE_SELF)");
719 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
720 perror("getrlimit(RLIMIT_MEMLOCK)");
724 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
725 long(used.ru_maxrss / 1024),
726 long(limit.rlim_cur / 1048576),
727 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
729 printf(", using %ld MB memory (not locked)",
730 long(used.ru_maxrss / 1024));
737 if (should_cut.exchange(false)) { // Test and clear.
738 video_encoder->do_cut(frame);
742 // Reset every 100 frames, so that local variations in frame times
743 // (especially for the first few frames, when the shaders are
744 // compiled etc.) don't make it hard to measure for the entire
745 // remaining duration of the program.
746 if (frame == 10000) {
754 resource_pool->clean_context();
757 void Mixer::get_one_frame_from_each_card(unsigned master_card_index, CaptureCard::NewFrame new_frames[MAX_CARDS], bool has_new_frame[MAX_CARDS], int num_samples[MAX_CARDS])
760 // The first card is the master timer, so wait for it to have a new frame.
761 // TODO: Add a timeout.
762 unique_lock<mutex> lock(bmusb_mutex);
763 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(); });
765 if (cards[master_card_index].new_frames.empty()) {
766 // We were woken up, but not due to a new frame. Deal with it
768 assert(cards[master_card_index].capture->get_disconnected());
769 handle_hotplugged_cards();
773 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
774 CaptureCard *card = &cards[card_index];
775 if (card->new_frames.empty()) {
776 assert(card_index != master_card_index);
777 card->queue_length_policy.update_policy(-1);
780 new_frames[card_index] = move(card->new_frames.front());
781 has_new_frame[card_index] = true;
782 card->new_frames.pop();
783 card->new_frames_changed.notify_all();
785 int num_samples_times_timebase = OUTPUT_FREQUENCY * new_frames[card_index].length + card->fractional_samples;
786 num_samples[card_index] = num_samples_times_timebase / TIMEBASE;
787 card->fractional_samples = num_samples_times_timebase % TIMEBASE;
788 assert(num_samples[card_index] >= 0);
790 if (card_index == master_card_index) {
791 // We don't use the queue length policy for the master card,
792 // but we will if it stops being the master. Thus, clear out
793 // the policy in case we switch in the future.
794 card->queue_length_policy.reset(card_index);
796 // If we have excess frames compared to the policy for this card,
797 // drop frames from the head.
798 card->queue_length_policy.update_policy(card->new_frames.size());
799 while (card->new_frames.size() > card->queue_length_policy.get_safe_queue_length()) {
800 card->new_frames.pop();
806 void Mixer::handle_hotplugged_cards()
808 // Check for cards that have been disconnected since last frame.
809 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
810 CaptureCard *card = &cards[card_index];
811 if (card->capture->get_disconnected()) {
812 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
813 FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
814 configure_card(card_index, capture, /*is_fake_capture=*/true);
815 card->queue_length_policy.reset(card_index);
816 card->capture->start_bm_capture();
820 // Check for cards that have been connected since last frame.
821 vector<libusb_device *> hotplugged_cards_copy;
823 lock_guard<mutex> lock(hotplug_mutex);
824 swap(hotplugged_cards, hotplugged_cards_copy);
826 for (libusb_device *new_dev : hotplugged_cards_copy) {
827 // Look for a fake capture card where we can stick this in.
828 int free_card_index = -1;
829 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
830 if (cards[card_index].is_fake_capture) {
831 free_card_index = int(card_index);
836 if (free_card_index == -1) {
837 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
838 libusb_unref_device(new_dev);
840 // BMUSBCapture takes ownership.
841 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
842 CaptureCard *card = &cards[free_card_index];
843 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
844 configure_card(free_card_index, capture, /*is_fake_capture=*/false);
845 card->queue_length_policy.reset(free_card_index);
846 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
847 capture->start_bm_capture();
853 void Mixer::schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame)
855 // Resample the audio as needed, including from previously dropped frames.
856 assert(num_cards > 0);
857 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
858 const bool dropped_frame = (frame_num != dropped_frames);
860 // Signal to the audio thread to process this frame.
861 // Note that if the frame is a dropped frame, we signal that
862 // we don't want to use this frame as base for adjusting
863 // the resampler rate. The reason for this is that the timing
864 // of these frames is often way too late; they typically don't
865 // “arrive” before we synthesize them. Thus, we could end up
866 // in a situation where we have inserted e.g. five audio frames
867 // into the queue before we then start pulling five of them
868 // back out. This makes ResamplingQueue overestimate the delay,
869 // causing undue resampler changes. (We _do_ use the last,
870 // non-dropped frame; perhaps we should just discard that as well,
871 // since dropped frames are expected to be rare, and it might be
872 // better to just wait until we have a slightly more normal situation).
873 unique_lock<mutex> lock(audio_mutex);
874 bool adjust_rate = !dropped_frame;
875 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate});
876 audio_task_queue_changed.notify_one();
879 // For dropped frames, increase the pts. Note that if the format changed
880 // in the meantime, we have no way of detecting that; we just have to
881 // assume the frame length is always the same.
882 pts_int += length_per_frame;
887 void Mixer::render_one_frame(int64_t duration)
889 // Get the main chain from the theme, and set its state immediately.
890 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT, input_state);
891 EffectChain *chain = theme_main_chain.chain;
892 theme_main_chain.setup_chain();
893 //theme_main_chain.chain->enable_phase_timing(true);
895 GLuint y_tex, cbcr_tex;
896 bool got_frame = video_encoder->begin_frame(&y_tex, &cbcr_tex);
899 // Render main chain.
900 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
901 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
902 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
904 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
905 resource_pool->release_fbo(fbo);
907 subsample_chroma(cbcr_full_tex, cbcr_tex);
908 resource_pool->release_2d_texture(cbcr_full_tex);
910 // Set the right state for rgba_tex.
911 glBindFramebuffer(GL_FRAMEBUFFER, 0);
912 glBindTexture(GL_TEXTURE_2D, rgba_tex);
913 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
914 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
915 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
917 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
918 RefCountedGLsync fence = video_encoder->end_frame(pts_int + av_delay, duration, theme_main_chain.input_frames);
920 // The live frame just shows the RGBA texture we just rendered.
921 // It owns rgba_tex now.
922 DisplayFrame live_frame;
923 live_frame.chain = display_chain.get();
924 live_frame.setup_chain = [this, rgba_tex]{
925 display_input->set_texture_num(rgba_tex);
927 live_frame.ready_fence = fence;
928 live_frame.input_frames = {};
929 live_frame.temp_textures = { rgba_tex };
930 output_channel[OUTPUT_LIVE].output_frame(live_frame);
932 // Set up preview and any additional channels.
933 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
934 DisplayFrame display_frame;
935 Theme::Chain chain = theme->get_chain(i, pts(), WIDTH, HEIGHT, input_state); // FIXME: dimensions
936 display_frame.chain = chain.chain;
937 display_frame.setup_chain = chain.setup_chain;
938 display_frame.ready_fence = fence;
939 display_frame.input_frames = chain.input_frames;
940 display_frame.temp_textures = {};
941 output_channel[i].output_frame(display_frame);
945 void Mixer::send_audio_level_callback()
947 if (audio_level_callback == nullptr) {
951 unique_lock<mutex> lock(compressor_mutex);
952 double loudness_s = r128.loudness_S();
953 double loudness_i = r128.integrated();
954 double loudness_range_low = r128.range_min();
955 double loudness_range_high = r128.range_max();
957 audio_level_callback(loudness_s, 20.0 * log10(peak),
958 loudness_i, loudness_range_low, loudness_range_high,
959 gain_staging_db, 20.0 * log10(final_makeup_gain),
960 correlation.get_correlation());
963 void Mixer::audio_thread_func()
965 while (!should_quit) {
969 unique_lock<mutex> lock(audio_mutex);
970 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
974 task = audio_task_queue.front();
975 audio_task_queue.pop();
978 process_audio_one_frame(task.pts_int, task.num_samples, task.adjust_rate);
982 void Mixer::process_audio_one_frame(int64_t frame_pts_int, int num_samples, bool adjust_rate)
984 vector<float> samples_card;
985 vector<float> samples_out;
987 // TODO: Allow mixing audio from several sources.
988 unsigned selected_audio_card = theme->map_signal(audio_source_channel);
989 assert(selected_audio_card < num_cards);
991 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
992 samples_card.resize(num_samples * 2);
994 unique_lock<mutex> lock(cards[card_index].audio_mutex);
995 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
996 adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
997 cards[card_index].resampling_queue->get_output_samples(
998 double(frame_pts_int) / TIMEBASE,
1001 rate_adjustment_policy);
1003 if (card_index == selected_audio_card) {
1004 samples_out = move(samples_card);
1008 // Cut away everything under 120 Hz (or whatever the cutoff is);
1009 // we don't need it for voice, and it will reduce headroom
1010 // and confuse the compressor. (In particular, any hums at 50 or 60 Hz
1011 // should be dampened.)
1012 if (locut_enabled) {
1013 locut.render(samples_out.data(), samples_out.size() / 2, locut_cutoff_hz * 2.0 * M_PI / OUTPUT_FREQUENCY, 0.5f);
1016 // Apply a level compressor to get the general level right.
1017 // Basically, if it's over about -40 dBFS, we squeeze it down to that level
1018 // (or more precisely, near it, since we don't use infinite ratio),
1019 // then apply a makeup gain to get it to -14 dBFS. -14 dBFS is, of course,
1020 // entirely arbitrary, but from practical tests with speech, it seems to
1021 // put ut around -23 LUFS, so it's a reasonable starting point for later use.
1023 unique_lock<mutex> lock(compressor_mutex);
1024 if (level_compressor_enabled) {
1025 float threshold = 0.01f; // -40 dBFS.
1026 float ratio = 20.0f;
1027 float attack_time = 0.5f;
1028 float release_time = 20.0f;
1029 float makeup_gain = pow(10.0f, (ref_level_dbfs - (-40.0f)) / 20.0f); // +26 dB.
1030 level_compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
1031 gain_staging_db = 20.0 * log10(level_compressor.get_attenuation() * makeup_gain);
1033 // Just apply the gain we already had.
1034 float g = pow(10.0f, gain_staging_db / 20.0f);
1035 for (size_t i = 0; i < samples_out.size(); ++i) {
1036 samples_out[i] *= g;
1042 printf("level=%f (%+5.2f dBFS) attenuation=%f (%+5.2f dB) end_result=%+5.2f dB\n",
1043 level_compressor.get_level(), 20.0 * log10(level_compressor.get_level()),
1044 level_compressor.get_attenuation(), 20.0 * log10(level_compressor.get_attenuation()),
1045 20.0 * log10(level_compressor.get_level() * level_compressor.get_attenuation() * makeup_gain));
1048 // float limiter_att, compressor_att;
1050 // The real compressor.
1051 if (compressor_enabled) {
1052 float threshold = pow(10.0f, compressor_threshold_dbfs / 20.0f);
1053 float ratio = 20.0f;
1054 float attack_time = 0.005f;
1055 float release_time = 0.040f;
1056 float makeup_gain = 2.0f; // +6 dB.
1057 compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
1058 // compressor_att = compressor.get_attenuation();
1061 // Finally a limiter at -4 dB (so, -10 dBFS) to take out the worst peaks only.
1062 // Note that since ratio is not infinite, we could go slightly higher than this.
1063 if (limiter_enabled) {
1064 float threshold = pow(10.0f, limiter_threshold_dbfs / 20.0f);
1065 float ratio = 30.0f;
1066 float attack_time = 0.0f; // Instant.
1067 float release_time = 0.020f;
1068 float makeup_gain = 1.0f; // 0 dB.
1069 limiter.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
1070 // limiter_att = limiter.get_attenuation();
1073 // printf("limiter=%+5.1f compressor=%+5.1f\n", 20.0*log10(limiter_att), 20.0*log10(compressor_att));
1075 // At this point, we are most likely close to +0 LU, but all of our
1076 // measurements have been on raw sample values, not R128 values.
1077 // So we have a final makeup gain to get us to +0 LU; the gain
1078 // adjustments required should be relatively small, and also, the
1079 // offset shouldn't change much (only if the type of audio changes
1080 // significantly). Thus, we shoot for updating this value basically
1081 // “whenever we process buffers”, since the R128 calculation isn't exactly
1082 // something we get out per-sample.
1084 // Note that there's a feedback loop here, so we choose a very slow filter
1085 // (half-time of 100 seconds).
1086 double target_loudness_factor, alpha;
1088 unique_lock<mutex> lock(compressor_mutex);
1089 double loudness_lu = r128.loudness_M() - ref_level_lufs;
1090 double current_makeup_lu = 20.0f * log10(final_makeup_gain);
1091 target_loudness_factor = pow(10.0f, -loudness_lu / 20.0f);
1093 // If we're outside +/- 5 LU uncorrected, we don't count it as
1094 // a normal signal (probably silence) and don't change the
1095 // correction factor; just apply what we already have.
1096 if (fabs(loudness_lu - current_makeup_lu) >= 5.0 || !final_makeup_gain_auto) {
1099 // Formula adapted from
1100 // https://en.wikipedia.org/wiki/Low-pass_filter#Simple_infinite_impulse_response_filter.
1101 const double half_time_s = 100.0;
1102 const double fc_mul_2pi_delta_t = 1.0 / (half_time_s * OUTPUT_FREQUENCY);
1103 alpha = fc_mul_2pi_delta_t / (fc_mul_2pi_delta_t + 1.0);
1106 double m = final_makeup_gain;
1107 for (size_t i = 0; i < samples_out.size(); i += 2) {
1108 samples_out[i + 0] *= m;
1109 samples_out[i + 1] *= m;
1110 m += (target_loudness_factor - m) * alpha;
1112 final_makeup_gain = m;
1115 // Upsample 4x to find interpolated peak.
1116 peak_resampler.inp_data = samples_out.data();
1117 peak_resampler.inp_count = samples_out.size() / 2;
1119 vector<float> interpolated_samples_out;
1120 interpolated_samples_out.resize(samples_out.size());
1121 while (peak_resampler.inp_count > 0) { // About four iterations.
1122 peak_resampler.out_data = &interpolated_samples_out[0];
1123 peak_resampler.out_count = interpolated_samples_out.size() / 2;
1124 peak_resampler.process();
1125 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
1126 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
1127 peak_resampler.out_data = nullptr;
1130 // Find R128 levels and L/R correlation.
1131 vector<float> left, right;
1132 deinterleave_samples(samples_out, &left, &right);
1133 float *ptrs[] = { left.data(), right.data() };
1135 unique_lock<mutex> lock(compressor_mutex);
1136 r128.process(left.size(), ptrs);
1137 correlation.process_samples(samples_out);
1140 // Send the samples to the sound card.
1142 alsa->write(samples_out);
1145 // And finally add them to the output.
1146 video_encoder->add_audio(frame_pts_int, move(samples_out));
1149 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
1152 glGenVertexArrays(1, &vao);
1155 glBindVertexArray(vao);
1159 GLuint fbo = resource_pool->create_fbo(dst_tex);
1160 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
1161 glViewport(0, 0, WIDTH/2, HEIGHT/2);
1164 glUseProgram(cbcr_program_num);
1167 glActiveTexture(GL_TEXTURE0);
1169 glBindTexture(GL_TEXTURE_2D, src_tex);
1171 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
1173 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
1175 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1178 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
1179 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
1181 glBindBuffer(GL_ARRAY_BUFFER, cbcr_vbo);
1184 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
1185 glEnableVertexAttribArray(attr_index);
1187 glVertexAttribPointer(attr_index, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
1191 glDrawArrays(GL_TRIANGLES, 0, 3);
1194 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
1195 glDisableVertexAttribArray(attr_index);
1201 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1204 resource_pool->release_fbo(fbo);
1205 glDeleteVertexArrays(1, &vao);
1208 void Mixer::release_display_frame(DisplayFrame *frame)
1210 for (GLuint texnum : frame->temp_textures) {
1211 resource_pool->release_2d_texture(texnum);
1213 frame->temp_textures.clear();
1214 frame->ready_fence.reset();
1215 frame->input_frames.clear();
1220 mixer_thread = thread(&Mixer::thread_func, this);
1221 audio_thread = thread(&Mixer::audio_thread_func, this);
1227 audio_task_queue_changed.notify_one();
1228 mixer_thread.join();
1229 audio_thread.join();
1232 void Mixer::transition_clicked(int transition_num)
1234 theme->transition_clicked(transition_num, pts());
1237 void Mixer::channel_clicked(int preview_num)
1239 theme->channel_clicked(preview_num);
1242 void Mixer::reset_meters()
1244 peak_resampler.reset();
1247 r128.integr_start();
1248 correlation.reset();
1251 void Mixer::start_mode_scanning(unsigned card_index)
1253 assert(card_index < num_cards);
1254 if (is_mode_scanning[card_index]) {
1257 is_mode_scanning[card_index] = true;
1258 mode_scanlist[card_index].clear();
1259 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1260 mode_scanlist[card_index].push_back(mode.first);
1262 assert(!mode_scanlist[card_index].empty());
1263 mode_scanlist_index[card_index] = 0;
1264 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1265 last_mode_scan_change[card_index] = steady_clock::now();
1268 Mixer::OutputChannel::~OutputChannel()
1270 if (has_current_frame) {
1271 parent->release_display_frame(¤t_frame);
1273 if (has_ready_frame) {
1274 parent->release_display_frame(&ready_frame);
1278 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1280 // Store this frame for display. Remove the ready frame if any
1281 // (it was seemingly never used).
1283 unique_lock<mutex> lock(frame_mutex);
1284 if (has_ready_frame) {
1285 parent->release_display_frame(&ready_frame);
1287 ready_frame = frame;
1288 has_ready_frame = true;
1291 if (new_frame_ready_callback) {
1292 new_frame_ready_callback();
1295 // Reduce the number of callbacks by filtering duplicates. The reason
1296 // why we bother doing this is that Qt seemingly can get into a state
1297 // where its builds up an essentially unbounded queue of signals,
1298 // consuming more and more memory, and there's no good way of collapsing
1299 // user-defined signals or limiting the length of the queue.
1300 if (transition_names_updated_callback) {
1301 vector<string> transition_names = global_mixer->get_transition_names();
1302 bool changed = false;
1303 if (transition_names.size() != last_transition_names.size()) {
1306 for (unsigned i = 0; i < transition_names.size(); ++i) {
1307 if (transition_names[i] != last_transition_names[i]) {
1314 transition_names_updated_callback(transition_names);
1315 last_transition_names = transition_names;
1318 if (name_updated_callback) {
1319 string name = global_mixer->get_channel_name(channel);
1320 if (name != last_name) {
1321 name_updated_callback(name);
1325 if (color_updated_callback) {
1326 string color = global_mixer->get_channel_color(channel);
1327 if (color != last_color) {
1328 color_updated_callback(color);
1334 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1336 unique_lock<mutex> lock(frame_mutex);
1337 if (!has_current_frame && !has_ready_frame) {
1341 if (has_current_frame && has_ready_frame) {
1342 // We have a new ready frame. Toss the current one.
1343 parent->release_display_frame(¤t_frame);
1344 has_current_frame = false;
1346 if (has_ready_frame) {
1347 assert(!has_current_frame);
1348 current_frame = ready_frame;
1349 ready_frame.ready_fence.reset(); // Drop the refcount.
1350 ready_frame.input_frames.clear(); // Drop the refcounts.
1351 has_current_frame = true;
1352 has_ready_frame = false;
1355 *frame = current_frame;
1359 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1361 new_frame_ready_callback = callback;
1364 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1366 transition_names_updated_callback = callback;
1369 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1371 name_updated_callback = callback;
1374 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1376 color_updated_callback = callback;
1379 mutex RefCountedGLsync::fence_lock;