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>
18 #include <sys/resource.h>
24 #include <condition_variable>
33 #include "bmusb/bmusb.h"
34 #include "bmusb/fake_capture.h"
37 #include "decklink_capture.h"
39 #include "disk_space_estimator.h"
41 #include "pbo_frame_allocator.h"
42 #include "ref_counted_gl_sync.h"
44 #include "video_encoder.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 insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
62 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
63 input_state->buffered_frames[card_index][frame_num] =
64 input_state->buffered_frames[card_index][frame_num - 1];
66 input_state->buffered_frames[card_index][0] = { frame, field_num };
68 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
69 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
76 void QueueLengthPolicy::update_policy(int queue_length)
78 if (queue_length < 0) { // Starvation.
79 if (been_at_safe_point_since_last_starvation && safe_queue_length < 5) {
81 fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frames\n",
82 card_index, safe_queue_length);
84 frames_with_at_least_one = 0;
85 been_at_safe_point_since_last_starvation = false;
88 if (queue_length > 0) {
89 if (queue_length >= int(safe_queue_length)) {
90 been_at_safe_point_since_last_starvation = true;
92 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 0) {
94 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frames\n",
95 card_index, safe_queue_length);
96 frames_with_at_least_one = 0;
99 frames_with_at_least_one = 0;
103 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
105 num_cards(num_cards),
106 mixer_surface(create_surface(format)),
107 h264_encoder_surface(create_surface(format)),
108 audio_mixer(num_cards),
109 correlation(OUTPUT_FREQUENCY)
111 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
114 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
115 // will be halved when sampling them, and we need to compensate here.
116 movit_texel_subpixel_precision /= 2.0;
118 resource_pool.reset(new ResourcePool);
119 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
120 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
121 output_channel[i].parent = this;
122 output_channel[i].channel = i;
125 ImageFormat inout_format;
126 inout_format.color_space = COLORSPACE_sRGB;
127 inout_format.gamma_curve = GAMMA_sRGB;
129 // Display chain; shows the live output produced by the main chain (its RGBA version).
130 display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
132 display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT); // FIXME: GL_UNSIGNED_BYTE is really wrong.
133 display_chain->add_input(display_input);
134 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
135 display_chain->set_dither_bits(0); // Don't bother.
136 display_chain->finalize();
138 video_encoder.reset(new VideoEncoder(resource_pool.get(), h264_encoder_surface, global_flags.va_display, WIDTH, HEIGHT, &httpd, global_disk_space_estimator));
140 // Start listening for clients only once VideoEncoder has written its header, if any.
143 // First try initializing the then PCI devices, then USB, then
144 // fill up with fake cards until we have the desired number of cards.
145 unsigned num_pci_devices = 0;
146 unsigned card_index = 0;
149 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
150 if (decklink_iterator != nullptr) {
151 for ( ; card_index < num_cards; ++card_index) {
153 if (decklink_iterator->Next(&decklink) != S_OK) {
157 configure_card(card_index, new DeckLinkCapture(decklink, card_index), /*is_fake_capture=*/false);
160 decklink_iterator->Release();
161 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
163 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
166 unsigned num_usb_devices = BMUSBCapture::num_cards();
167 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
168 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
169 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
170 configure_card(card_index, capture, /*is_fake_capture=*/false);
172 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
174 unsigned num_fake_cards = 0;
175 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
176 FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
177 configure_card(card_index, capture, /*is_fake_capture=*/true);
180 if (num_fake_cards > 0) {
181 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
184 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
185 BMUSBCapture::start_bm_thread();
187 for (card_index = 0; card_index < num_cards; ++card_index) {
188 cards[card_index].queue_length_policy.reset(card_index);
189 cards[card_index].capture->start_bm_capture();
192 // Set up stuff for NV12 conversion.
195 string cbcr_vert_shader =
198 "in vec2 position; \n"
199 "in vec2 texcoord; \n"
201 "uniform vec2 foo_chroma_offset_0; \n"
205 " // The result of glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0) is: \n"
207 " // 2.000 0.000 0.000 -1.000 \n"
208 " // 0.000 2.000 0.000 -1.000 \n"
209 " // 0.000 0.000 -2.000 -1.000 \n"
210 " // 0.000 0.000 0.000 1.000 \n"
211 " gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0); \n"
212 " vec2 flipped_tc = texcoord; \n"
213 " tc0 = flipped_tc + foo_chroma_offset_0; \n"
215 string cbcr_frag_shader =
218 "uniform sampler2D cbcr_tex; \n"
219 "out vec4 FragColor; \n"
221 " FragColor = texture(cbcr_tex, tc0); \n"
223 vector<string> frag_shader_outputs;
224 cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader, frag_shader_outputs);
231 cbcr_vbo = generate_vbo(2, GL_FLOAT, sizeof(vertices), vertices);
232 cbcr_position_attribute_index = glGetAttribLocation(cbcr_program_num, "position");
233 cbcr_texcoord_attribute_index = glGetAttribLocation(cbcr_program_num, "texcoord");
235 r128.init(2, OUTPUT_FREQUENCY);
238 // hlen=16 is pretty low quality, but we use quite a bit of CPU otherwise,
239 // and there's a limit to how important the peak meter is.
240 peak_resampler.setup(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY * 4, /*num_channels=*/2, /*hlen=*/16, /*frel=*/1.0);
242 if (global_flags.enable_alsa_output) {
243 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
249 resource_pool->release_glsl_program(cbcr_program_num);
250 glDeleteBuffers(1, &cbcr_vbo);
251 BMUSBCapture::stop_bm_thread();
253 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
255 unique_lock<mutex> lock(bmusb_mutex);
256 cards[card_index].should_quit = true; // Unblock thread.
257 cards[card_index].new_frames_changed.notify_all();
259 cards[card_index].capture->stop_dequeue_thread();
262 video_encoder.reset(nullptr);
265 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, bool is_fake_capture)
267 printf("Configuring card %d...\n", card_index);
269 CaptureCard *card = &cards[card_index];
270 if (card->capture != nullptr) {
271 card->capture->stop_dequeue_thread();
272 delete card->capture;
274 card->capture = capture;
275 card->is_fake_capture = is_fake_capture;
276 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
277 if (card->frame_allocator == nullptr) {
278 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, WIDTH, HEIGHT)); // 8 MB.
280 card->capture->set_video_frame_allocator(card->frame_allocator.get());
281 if (card->surface == nullptr) {
282 card->surface = create_surface_with_same_format(mixer_surface);
284 while (!card->new_frames.empty()) card->new_frames.pop();
285 card->fractional_samples = 0;
286 card->last_timecode = -1;
287 card->capture->configure_card();
288 audio_mixer.reset_card(card_index);
289 audio_mixer.set_name(card_index, card->capture->get_description());
295 int unwrap_timecode(uint16_t current_wrapped, int last)
297 uint16_t last_wrapped = last & 0xffff;
298 if (current_wrapped > last_wrapped) {
299 return (last & ~0xffff) | current_wrapped;
301 return 0x10000 + ((last & ~0xffff) | current_wrapped);
305 float find_peak(const float *samples, size_t num_samples)
307 float m = fabs(samples[0]);
308 for (size_t i = 1; i < num_samples; ++i) {
309 m = max(m, fabs(samples[i]));
314 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
316 size_t num_samples = in.size() / 2;
317 out_l->resize(num_samples);
318 out_r->resize(num_samples);
320 const float *inptr = in.data();
321 float *lptr = &(*out_l)[0];
322 float *rptr = &(*out_r)[0];
323 for (size_t i = 0; i < num_samples; ++i) {
331 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
332 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
333 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
335 CaptureCard *card = &cards[card_index];
337 if (is_mode_scanning[card_index]) {
338 if (video_format.has_signal) {
339 // Found a stable signal, so stop scanning.
340 is_mode_scanning[card_index] = false;
342 static constexpr double switch_time_s = 0.5; // Should be enough time for the signal to stabilize.
343 steady_clock::time_point now = steady_clock::now();
344 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
345 if (sec_since_last_switch > switch_time_s) {
346 // It isn't this mode; try the next one.
347 mode_scanlist_index[card_index]++;
348 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
349 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
350 last_mode_scan_change[card_index] = now;
355 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
356 assert(frame_length > 0);
358 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;
359 if (num_samples > OUTPUT_FREQUENCY / 10) {
360 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",
361 card_index, int(audio_frame.len), int(audio_offset),
362 timecode, int(video_frame.len), int(video_offset), video_format.id);
363 if (video_frame.owner) {
364 video_frame.owner->release_frame(video_frame);
366 if (audio_frame.owner) {
367 audio_frame.owner->release_frame(audio_frame);
372 int dropped_frames = 0;
373 if (card->last_timecode != -1) {
374 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
377 // Number of samples per frame if we need to insert silence.
378 // (Could be nonintegral, but resampling will save us then.)
379 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
381 if (dropped_frames > MAX_FPS * 2) {
382 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
383 card_index, card->last_timecode, timecode);
384 audio_mixer.reset_card(card_index);
386 } else if (dropped_frames > 0) {
387 // Insert silence as needed.
388 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
389 card_index, dropped_frames, timecode);
391 audio_mixer.add_silence(card_index, silence_samples, dropped_frames, frame_length);
394 audio_mixer.add_audio(card_index, audio_frame.data + audio_offset, num_samples, audio_format, frame_length);
396 // Done with the audio, so release it.
397 if (audio_frame.owner) {
398 audio_frame.owner->release_frame(audio_frame);
401 card->last_timecode = timecode;
403 size_t expected_length = video_format.width * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom) * 2;
404 if (video_frame.len - video_offset == 0 ||
405 video_frame.len - video_offset != expected_length) {
406 if (video_frame.len != 0) {
407 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
408 card_index, video_frame.len - video_offset, expected_length);
410 if (video_frame.owner) {
411 video_frame.owner->release_frame(video_frame);
414 // Still send on the information that we _had_ a frame, even though it's corrupted,
415 // so that pts can go up accordingly.
417 unique_lock<mutex> lock(bmusb_mutex);
418 CaptureCard::NewFrame new_frame;
419 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
420 new_frame.length = frame_length;
421 new_frame.interlaced = false;
422 new_frame.dropped_frames = dropped_frames;
423 card->new_frames.push(move(new_frame));
424 card->new_frames_changed.notify_all();
429 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
431 unsigned num_fields = video_format.interlaced ? 2 : 1;
432 steady_clock::time_point frame_upload_start;
433 if (video_format.interlaced) {
434 // Send the two fields along as separate frames; the other side will need to add
435 // a deinterlacer to actually get this right.
436 assert(video_format.height % 2 == 0);
437 video_format.height /= 2;
438 assert(frame_length % 2 == 0);
441 frame_upload_start = steady_clock::now();
443 userdata->last_interlaced = video_format.interlaced;
444 userdata->last_has_signal = video_format.has_signal;
445 userdata->last_is_connected = video_format.is_connected;
446 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
447 userdata->last_frame_rate_den = video_format.frame_rate_den;
448 RefCountedFrame frame(video_frame);
450 // Upload the textures.
451 size_t cbcr_width = video_format.width / 2;
452 size_t cbcr_offset = video_offset / 2;
453 size_t y_offset = video_frame.size / 2 + video_offset / 2;
455 for (unsigned field = 0; field < num_fields; ++field) {
456 // Put the actual texture upload in a lambda that is executed in the main thread.
457 // It is entirely possible to do this in the same thread (and it might even be
458 // faster, depending on the GPU and driver), but it appears to be trickling
459 // driver bugs very easily.
461 // Note that this means we must hold on to the actual frame data in <userdata>
462 // until the upload command is run, but we hold on to <frame> much longer than that
463 // (in fact, all the way until we no longer use the texture in rendering).
464 auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, userdata]() {
465 unsigned field_start_line = (field == 1) ? video_format.second_field_start : video_format.extra_lines_top + field * (video_format.height + 22);
467 if (userdata->tex_y[field] == 0 ||
468 userdata->tex_cbcr[field] == 0 ||
469 video_format.width != userdata->last_width[field] ||
470 video_format.height != userdata->last_height[field]) {
471 // We changed resolution since last use of this texture, so we need to create
472 // a new object. Note that this each card has its own PBOFrameAllocator,
473 // we don't need to worry about these flip-flopping between resolutions.
474 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
476 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, video_format.height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
478 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
480 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, video_format.width, video_format.height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
482 userdata->last_width[field] = video_format.width;
483 userdata->last_height[field] = video_format.height;
486 GLuint pbo = userdata->pbo;
488 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
491 size_t field_y_start = y_offset + video_format.width * field_start_line;
492 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
494 if (global_flags.flush_pbos) {
495 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_y_start, video_format.width * video_format.height);
497 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_cbcr_start, cbcr_width * video_format.height * sizeof(uint16_t));
501 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
503 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, video_format.height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_cbcr_start));
505 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
507 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, video_format.width, video_format.height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_y_start));
509 glBindTexture(GL_TEXTURE_2D, 0);
511 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
516 // Don't upload the second field as fast as we can; wait until
517 // the field time has approximately passed. (Otherwise, we could
518 // get timing jitter against the other sources, and possibly also
519 // against the video display, although the latter is not as critical.)
520 // This requires our system clock to be reasonably close to the
521 // video clock, but that's not an unreasonable assumption.
522 steady_clock::time_point second_field_start = frame_upload_start +
523 nanoseconds(frame_length * 1000000000 / TIMEBASE);
524 this_thread::sleep_until(second_field_start);
528 unique_lock<mutex> lock(bmusb_mutex);
529 CaptureCard::NewFrame new_frame;
530 new_frame.frame = frame;
531 new_frame.length = frame_length;
532 new_frame.field = field;
533 new_frame.interlaced = video_format.interlaced;
534 new_frame.upload_func = upload_func;
535 new_frame.dropped_frames = dropped_frames;
536 card->new_frames.push(move(new_frame));
537 card->new_frames_changed.notify_all();
542 void Mixer::bm_hotplug_add(libusb_device *dev)
544 lock_guard<mutex> lock(hotplug_mutex);
545 hotplugged_cards.push_back(dev);
548 void Mixer::bm_hotplug_remove(unsigned card_index)
550 cards[card_index].new_frames_changed.notify_all();
553 void Mixer::thread_func()
555 eglBindAPI(EGL_OPENGL_API);
556 QOpenGLContext *context = create_context(mixer_surface);
557 if (!make_current(context, mixer_surface)) {
562 steady_clock::time_point start, now;
563 start = steady_clock::now();
566 int stats_dropped_frames = 0;
568 while (!should_quit) {
569 CaptureCard::NewFrame new_frames[MAX_CARDS];
570 bool has_new_frame[MAX_CARDS] = { false };
571 int num_samples[MAX_CARDS] = { 0 };
573 unsigned master_card_index = theme->map_signal(master_clock_channel);
574 assert(master_card_index < num_cards);
576 get_one_frame_from_each_card(master_card_index, new_frames, has_new_frame, num_samples);
577 schedule_audio_resampling_tasks(new_frames[master_card_index].dropped_frames, num_samples[master_card_index], new_frames[master_card_index].length);
578 stats_dropped_frames += new_frames[master_card_index].dropped_frames;
579 send_audio_level_callback();
581 handle_hotplugged_cards();
583 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
584 if (card_index == master_card_index || !has_new_frame[card_index]) {
587 if (new_frames[card_index].frame->len == 0) {
588 ++new_frames[card_index].dropped_frames;
590 if (new_frames[card_index].dropped_frames > 0) {
591 printf("Card %u dropped %d frames before this\n",
592 card_index, int(new_frames[card_index].dropped_frames));
596 // If the first card is reporting a corrupted or otherwise dropped frame,
597 // just increase the pts (skipping over this frame) and don't try to compute anything new.
598 if (new_frames[master_card_index].frame->len == 0) {
599 ++stats_dropped_frames;
600 pts_int += new_frames[master_card_index].length;
604 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
605 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
608 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
609 assert(new_frame->frame != nullptr);
610 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
613 // The new texture might need uploading before use.
614 if (new_frame->upload_func) {
615 new_frame->upload_func();
616 new_frame->upload_func = nullptr;
620 int64_t frame_duration = new_frames[master_card_index].length;
621 render_one_frame(frame_duration);
623 pts_int += frame_duration;
625 now = steady_clock::now();
626 double elapsed = duration<double>(now - start).count();
627 if (frame % 100 == 0) {
628 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
629 frame, stats_dropped_frames, elapsed, frame / elapsed,
630 1e3 * elapsed / frame);
631 // chain->print_phase_timing();
633 // Check our memory usage, to see if we are close to our mlockall()
634 // limit (if at all set).
636 if (getrusage(RUSAGE_SELF, &used) == -1) {
637 perror("getrusage(RUSAGE_SELF)");
643 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
644 perror("getrlimit(RLIMIT_MEMLOCK)");
648 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
649 long(used.ru_maxrss / 1024),
650 long(limit.rlim_cur / 1048576),
651 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
653 printf(", using %ld MB memory (not locked)",
654 long(used.ru_maxrss / 1024));
661 if (should_cut.exchange(false)) { // Test and clear.
662 video_encoder->do_cut(frame);
666 // Reset every 100 frames, so that local variations in frame times
667 // (especially for the first few frames, when the shaders are
668 // compiled etc.) don't make it hard to measure for the entire
669 // remaining duration of the program.
670 if (frame == 10000) {
678 resource_pool->clean_context();
681 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])
684 // The first card is the master timer, so wait for it to have a new frame.
685 // TODO: Add a timeout.
686 unique_lock<mutex> lock(bmusb_mutex);
687 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(); });
689 if (cards[master_card_index].new_frames.empty()) {
690 // We were woken up, but not due to a new frame. Deal with it
692 assert(cards[master_card_index].capture->get_disconnected());
693 handle_hotplugged_cards();
697 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
698 CaptureCard *card = &cards[card_index];
699 if (card->new_frames.empty()) {
700 assert(card_index != master_card_index);
701 card->queue_length_policy.update_policy(-1);
704 new_frames[card_index] = move(card->new_frames.front());
705 has_new_frame[card_index] = true;
706 card->new_frames.pop();
707 card->new_frames_changed.notify_all();
709 int num_samples_times_timebase = OUTPUT_FREQUENCY * new_frames[card_index].length + card->fractional_samples;
710 num_samples[card_index] = num_samples_times_timebase / TIMEBASE;
711 card->fractional_samples = num_samples_times_timebase % TIMEBASE;
712 assert(num_samples[card_index] >= 0);
714 if (card_index == master_card_index) {
715 // We don't use the queue length policy for the master card,
716 // but we will if it stops being the master. Thus, clear out
717 // the policy in case we switch in the future.
718 card->queue_length_policy.reset(card_index);
720 // If we have excess frames compared to the policy for this card,
721 // drop frames from the head.
722 card->queue_length_policy.update_policy(card->new_frames.size());
723 while (card->new_frames.size() > card->queue_length_policy.get_safe_queue_length()) {
724 card->new_frames.pop();
730 void Mixer::handle_hotplugged_cards()
732 // Check for cards that have been disconnected since last frame.
733 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
734 CaptureCard *card = &cards[card_index];
735 if (card->capture->get_disconnected()) {
736 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
737 FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
738 configure_card(card_index, capture, /*is_fake_capture=*/true);
739 card->queue_length_policy.reset(card_index);
740 card->capture->start_bm_capture();
744 // Check for cards that have been connected since last frame.
745 vector<libusb_device *> hotplugged_cards_copy;
747 lock_guard<mutex> lock(hotplug_mutex);
748 swap(hotplugged_cards, hotplugged_cards_copy);
750 for (libusb_device *new_dev : hotplugged_cards_copy) {
751 // Look for a fake capture card where we can stick this in.
752 int free_card_index = -1;
753 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
754 if (cards[card_index].is_fake_capture) {
755 free_card_index = int(card_index);
760 if (free_card_index == -1) {
761 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
762 libusb_unref_device(new_dev);
764 // BMUSBCapture takes ownership.
765 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
766 CaptureCard *card = &cards[free_card_index];
767 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
768 configure_card(free_card_index, capture, /*is_fake_capture=*/false);
769 card->queue_length_policy.reset(free_card_index);
770 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
771 capture->start_bm_capture();
777 void Mixer::schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame)
779 // Resample the audio as needed, including from previously dropped frames.
780 assert(num_cards > 0);
781 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
782 const bool dropped_frame = (frame_num != dropped_frames);
784 // Signal to the audio thread to process this frame.
785 // Note that if the frame is a dropped frame, we signal that
786 // we don't want to use this frame as base for adjusting
787 // the resampler rate. The reason for this is that the timing
788 // of these frames is often way too late; they typically don't
789 // “arrive” before we synthesize them. Thus, we could end up
790 // in a situation where we have inserted e.g. five audio frames
791 // into the queue before we then start pulling five of them
792 // back out. This makes ResamplingQueue overestimate the delay,
793 // causing undue resampler changes. (We _do_ use the last,
794 // non-dropped frame; perhaps we should just discard that as well,
795 // since dropped frames are expected to be rare, and it might be
796 // better to just wait until we have a slightly more normal situation).
797 unique_lock<mutex> lock(audio_mutex);
798 bool adjust_rate = !dropped_frame;
799 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate});
800 audio_task_queue_changed.notify_one();
803 // For dropped frames, increase the pts. Note that if the format changed
804 // in the meantime, we have no way of detecting that; we just have to
805 // assume the frame length is always the same.
806 pts_int += length_per_frame;
811 void Mixer::render_one_frame(int64_t duration)
813 // Get the main chain from the theme, and set its state immediately.
814 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT, input_state);
815 EffectChain *chain = theme_main_chain.chain;
816 theme_main_chain.setup_chain();
817 //theme_main_chain.chain->enable_phase_timing(true);
819 GLuint y_tex, cbcr_tex;
820 bool got_frame = video_encoder->begin_frame(&y_tex, &cbcr_tex);
823 // Render main chain.
824 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
825 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
826 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
828 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
829 resource_pool->release_fbo(fbo);
831 subsample_chroma(cbcr_full_tex, cbcr_tex);
832 resource_pool->release_2d_texture(cbcr_full_tex);
834 // Set the right state for rgba_tex.
835 glBindFramebuffer(GL_FRAMEBUFFER, 0);
836 glBindTexture(GL_TEXTURE_2D, rgba_tex);
837 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
838 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
839 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
841 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
842 RefCountedGLsync fence = video_encoder->end_frame(pts_int + av_delay, duration, theme_main_chain.input_frames);
844 // The live frame just shows the RGBA texture we just rendered.
845 // It owns rgba_tex now.
846 DisplayFrame live_frame;
847 live_frame.chain = display_chain.get();
848 live_frame.setup_chain = [this, rgba_tex]{
849 display_input->set_texture_num(rgba_tex);
851 live_frame.ready_fence = fence;
852 live_frame.input_frames = {};
853 live_frame.temp_textures = { rgba_tex };
854 output_channel[OUTPUT_LIVE].output_frame(live_frame);
856 // Set up preview and any additional channels.
857 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
858 DisplayFrame display_frame;
859 Theme::Chain chain = theme->get_chain(i, pts(), WIDTH, HEIGHT, input_state); // FIXME: dimensions
860 display_frame.chain = chain.chain;
861 display_frame.setup_chain = chain.setup_chain;
862 display_frame.ready_fence = fence;
863 display_frame.input_frames = chain.input_frames;
864 display_frame.temp_textures = {};
865 output_channel[i].output_frame(display_frame);
869 void Mixer::send_audio_level_callback()
871 if (audio_level_callback == nullptr) {
875 unique_lock<mutex> lock(audio_measure_mutex);
876 double loudness_s = r128.loudness_S();
877 double loudness_i = r128.integrated();
878 double loudness_range_low = r128.range_min();
879 double loudness_range_high = r128.range_max();
881 audio_level_callback(loudness_s, to_db(peak),
882 loudness_i, loudness_range_low, loudness_range_high,
883 audio_mixer.get_gain_staging_db(),
884 audio_mixer.get_final_makeup_gain_db(),
885 correlation.get_correlation());
888 void Mixer::audio_thread_func()
890 while (!should_quit) {
894 unique_lock<mutex> lock(audio_mutex);
895 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
899 task = audio_task_queue.front();
900 audio_task_queue.pop();
903 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
904 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
905 process_audio_one_frame(task.pts_int, task.num_samples, rate_adjustment_policy);
909 void Mixer::process_audio_one_frame(int64_t frame_pts_int, int num_samples, ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy)
911 vector<float> samples_out = audio_mixer.get_output(double(frame_pts_int) / TIMEBASE, num_samples, rate_adjustment_policy);
913 // Upsample 4x to find interpolated peak.
914 peak_resampler.inp_data = samples_out.data();
915 peak_resampler.inp_count = samples_out.size() / 2;
917 vector<float> interpolated_samples_out;
918 interpolated_samples_out.resize(samples_out.size());
920 unique_lock<mutex> lock(audio_measure_mutex);
922 while (peak_resampler.inp_count > 0) { // About four iterations.
923 peak_resampler.out_data = &interpolated_samples_out[0];
924 peak_resampler.out_count = interpolated_samples_out.size() / 2;
925 peak_resampler.process();
926 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
927 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
928 peak_resampler.out_data = nullptr;
932 // Find R128 levels and L/R correlation.
933 vector<float> left, right;
934 deinterleave_samples(samples_out, &left, &right);
935 float *ptrs[] = { left.data(), right.data() };
937 unique_lock<mutex> lock(audio_measure_mutex);
938 r128.process(left.size(), ptrs);
939 audio_mixer.set_current_loudness(r128.loudness_M());
940 correlation.process_samples(samples_out);
943 // Send the samples to the sound card.
945 alsa->write(samples_out);
948 // And finally add them to the output.
949 video_encoder->add_audio(frame_pts_int, move(samples_out));
952 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
955 glGenVertexArrays(1, &vao);
958 glBindVertexArray(vao);
962 GLuint fbo = resource_pool->create_fbo(dst_tex);
963 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
964 glViewport(0, 0, WIDTH/2, HEIGHT/2);
967 glUseProgram(cbcr_program_num);
970 glActiveTexture(GL_TEXTURE0);
972 glBindTexture(GL_TEXTURE_2D, src_tex);
974 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
976 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
978 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
981 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
982 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
984 glBindBuffer(GL_ARRAY_BUFFER, cbcr_vbo);
987 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
988 glEnableVertexAttribArray(attr_index);
990 glVertexAttribPointer(attr_index, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
994 glDrawArrays(GL_TRIANGLES, 0, 3);
997 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
998 glDisableVertexAttribArray(attr_index);
1004 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1007 resource_pool->release_fbo(fbo);
1008 glDeleteVertexArrays(1, &vao);
1011 void Mixer::release_display_frame(DisplayFrame *frame)
1013 for (GLuint texnum : frame->temp_textures) {
1014 resource_pool->release_2d_texture(texnum);
1016 frame->temp_textures.clear();
1017 frame->ready_fence.reset();
1018 frame->input_frames.clear();
1023 mixer_thread = thread(&Mixer::thread_func, this);
1024 audio_thread = thread(&Mixer::audio_thread_func, this);
1030 audio_task_queue_changed.notify_one();
1031 mixer_thread.join();
1032 audio_thread.join();
1035 void Mixer::transition_clicked(int transition_num)
1037 theme->transition_clicked(transition_num, pts());
1040 void Mixer::channel_clicked(int preview_num)
1042 theme->channel_clicked(preview_num);
1045 void Mixer::reset_meters()
1047 unique_lock<mutex> lock(audio_measure_mutex);
1048 peak_resampler.reset();
1051 r128.integr_start();
1052 correlation.reset();
1055 void Mixer::start_mode_scanning(unsigned card_index)
1057 assert(card_index < num_cards);
1058 if (is_mode_scanning[card_index]) {
1061 is_mode_scanning[card_index] = true;
1062 mode_scanlist[card_index].clear();
1063 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1064 mode_scanlist[card_index].push_back(mode.first);
1066 assert(!mode_scanlist[card_index].empty());
1067 mode_scanlist_index[card_index] = 0;
1068 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1069 last_mode_scan_change[card_index] = steady_clock::now();
1072 Mixer::OutputChannel::~OutputChannel()
1074 if (has_current_frame) {
1075 parent->release_display_frame(¤t_frame);
1077 if (has_ready_frame) {
1078 parent->release_display_frame(&ready_frame);
1082 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1084 // Store this frame for display. Remove the ready frame if any
1085 // (it was seemingly never used).
1087 unique_lock<mutex> lock(frame_mutex);
1088 if (has_ready_frame) {
1089 parent->release_display_frame(&ready_frame);
1091 ready_frame = frame;
1092 has_ready_frame = true;
1095 if (new_frame_ready_callback) {
1096 new_frame_ready_callback();
1099 // Reduce the number of callbacks by filtering duplicates. The reason
1100 // why we bother doing this is that Qt seemingly can get into a state
1101 // where its builds up an essentially unbounded queue of signals,
1102 // consuming more and more memory, and there's no good way of collapsing
1103 // user-defined signals or limiting the length of the queue.
1104 if (transition_names_updated_callback) {
1105 vector<string> transition_names = global_mixer->get_transition_names();
1106 bool changed = false;
1107 if (transition_names.size() != last_transition_names.size()) {
1110 for (unsigned i = 0; i < transition_names.size(); ++i) {
1111 if (transition_names[i] != last_transition_names[i]) {
1118 transition_names_updated_callback(transition_names);
1119 last_transition_names = transition_names;
1122 if (name_updated_callback) {
1123 string name = global_mixer->get_channel_name(channel);
1124 if (name != last_name) {
1125 name_updated_callback(name);
1129 if (color_updated_callback) {
1130 string color = global_mixer->get_channel_color(channel);
1131 if (color != last_color) {
1132 color_updated_callback(color);
1138 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1140 unique_lock<mutex> lock(frame_mutex);
1141 if (!has_current_frame && !has_ready_frame) {
1145 if (has_current_frame && has_ready_frame) {
1146 // We have a new ready frame. Toss the current one.
1147 parent->release_display_frame(¤t_frame);
1148 has_current_frame = false;
1150 if (has_ready_frame) {
1151 assert(!has_current_frame);
1152 current_frame = ready_frame;
1153 ready_frame.ready_fence.reset(); // Drop the refcount.
1154 ready_frame.input_frames.clear(); // Drop the refcounts.
1155 has_current_frame = true;
1156 has_ready_frame = false;
1159 *frame = current_frame;
1163 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1165 new_frame_ready_callback = callback;
1168 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1170 transition_names_updated_callback = callback;
1173 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1175 name_updated_callback = callback;
1178 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1180 color_updated_callback = callback;
1183 mutex RefCountedGLsync::fence_lock;