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 audio_mixer.reset_card(card_index);
285 while (!card->new_frames.empty()) card->new_frames.pop();
286 card->fractional_samples = 0;
287 card->last_timecode = -1;
288 card->capture->configure_card();
294 int unwrap_timecode(uint16_t current_wrapped, int last)
296 uint16_t last_wrapped = last & 0xffff;
297 if (current_wrapped > last_wrapped) {
298 return (last & ~0xffff) | current_wrapped;
300 return 0x10000 + ((last & ~0xffff) | current_wrapped);
304 float find_peak(const float *samples, size_t num_samples)
306 float m = fabs(samples[0]);
307 for (size_t i = 1; i < num_samples; ++i) {
308 m = max(m, fabs(samples[i]));
313 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
315 size_t num_samples = in.size() / 2;
316 out_l->resize(num_samples);
317 out_r->resize(num_samples);
319 const float *inptr = in.data();
320 float *lptr = &(*out_l)[0];
321 float *rptr = &(*out_r)[0];
322 for (size_t i = 0; i < num_samples; ++i) {
330 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
331 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
332 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
334 CaptureCard *card = &cards[card_index];
336 if (is_mode_scanning[card_index]) {
337 if (video_format.has_signal) {
338 // Found a stable signal, so stop scanning.
339 is_mode_scanning[card_index] = false;
341 static constexpr double switch_time_s = 0.5; // Should be enough time for the signal to stabilize.
342 steady_clock::time_point now = steady_clock::now();
343 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
344 if (sec_since_last_switch > switch_time_s) {
345 // It isn't this mode; try the next one.
346 mode_scanlist_index[card_index]++;
347 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
348 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
349 last_mode_scan_change[card_index] = now;
354 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
355 assert(frame_length > 0);
357 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;
358 if (num_samples > OUTPUT_FREQUENCY / 10) {
359 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",
360 card_index, int(audio_frame.len), int(audio_offset),
361 timecode, int(video_frame.len), int(video_offset), video_format.id);
362 if (video_frame.owner) {
363 video_frame.owner->release_frame(video_frame);
365 if (audio_frame.owner) {
366 audio_frame.owner->release_frame(audio_frame);
371 int dropped_frames = 0;
372 if (card->last_timecode != -1) {
373 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
376 // Number of samples per frame if we need to insert silence.
377 // (Could be nonintegral, but resampling will save us then.)
378 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
380 if (dropped_frames > MAX_FPS * 2) {
381 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
382 card_index, card->last_timecode, timecode);
383 audio_mixer.reset_card(card_index);
385 } else if (dropped_frames > 0) {
386 // Insert silence as needed.
387 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
388 card_index, dropped_frames, timecode);
390 audio_mixer.add_silence(card_index, silence_samples, dropped_frames, frame_length);
393 audio_mixer.add_audio(card_index, audio_frame.data + audio_offset, num_samples, audio_format, frame_length);
395 // Done with the audio, so release it.
396 if (audio_frame.owner) {
397 audio_frame.owner->release_frame(audio_frame);
400 card->last_timecode = timecode;
402 size_t expected_length = video_format.width * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom) * 2;
403 if (video_frame.len - video_offset == 0 ||
404 video_frame.len - video_offset != expected_length) {
405 if (video_frame.len != 0) {
406 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
407 card_index, video_frame.len - video_offset, expected_length);
409 if (video_frame.owner) {
410 video_frame.owner->release_frame(video_frame);
413 // Still send on the information that we _had_ a frame, even though it's corrupted,
414 // so that pts can go up accordingly.
416 unique_lock<mutex> lock(bmusb_mutex);
417 CaptureCard::NewFrame new_frame;
418 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
419 new_frame.length = frame_length;
420 new_frame.interlaced = false;
421 new_frame.dropped_frames = dropped_frames;
422 card->new_frames.push(move(new_frame));
423 card->new_frames_changed.notify_all();
428 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
430 unsigned num_fields = video_format.interlaced ? 2 : 1;
431 steady_clock::time_point frame_upload_start;
432 if (video_format.interlaced) {
433 // Send the two fields along as separate frames; the other side will need to add
434 // a deinterlacer to actually get this right.
435 assert(video_format.height % 2 == 0);
436 video_format.height /= 2;
437 assert(frame_length % 2 == 0);
440 frame_upload_start = steady_clock::now();
442 userdata->last_interlaced = video_format.interlaced;
443 userdata->last_has_signal = video_format.has_signal;
444 userdata->last_is_connected = video_format.is_connected;
445 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
446 userdata->last_frame_rate_den = video_format.frame_rate_den;
447 RefCountedFrame frame(video_frame);
449 // Upload the textures.
450 size_t cbcr_width = video_format.width / 2;
451 size_t cbcr_offset = video_offset / 2;
452 size_t y_offset = video_frame.size / 2 + video_offset / 2;
454 for (unsigned field = 0; field < num_fields; ++field) {
455 // Put the actual texture upload in a lambda that is executed in the main thread.
456 // It is entirely possible to do this in the same thread (and it might even be
457 // faster, depending on the GPU and driver), but it appears to be trickling
458 // driver bugs very easily.
460 // Note that this means we must hold on to the actual frame data in <userdata>
461 // until the upload command is run, but we hold on to <frame> much longer than that
462 // (in fact, all the way until we no longer use the texture in rendering).
463 auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, userdata]() {
464 unsigned field_start_line = (field == 1) ? video_format.second_field_start : video_format.extra_lines_top + field * (video_format.height + 22);
466 if (userdata->tex_y[field] == 0 ||
467 userdata->tex_cbcr[field] == 0 ||
468 video_format.width != userdata->last_width[field] ||
469 video_format.height != userdata->last_height[field]) {
470 // We changed resolution since last use of this texture, so we need to create
471 // a new object. Note that this each card has its own PBOFrameAllocator,
472 // we don't need to worry about these flip-flopping between resolutions.
473 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
475 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, video_format.height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
477 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
479 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, video_format.width, video_format.height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
481 userdata->last_width[field] = video_format.width;
482 userdata->last_height[field] = video_format.height;
485 GLuint pbo = userdata->pbo;
487 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
490 size_t field_y_start = y_offset + video_format.width * field_start_line;
491 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
493 if (global_flags.flush_pbos) {
494 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_y_start, video_format.width * video_format.height);
496 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_cbcr_start, cbcr_width * video_format.height * sizeof(uint16_t));
500 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
502 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, video_format.height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_cbcr_start));
504 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
506 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, video_format.width, video_format.height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_y_start));
508 glBindTexture(GL_TEXTURE_2D, 0);
510 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
515 // Don't upload the second field as fast as we can; wait until
516 // the field time has approximately passed. (Otherwise, we could
517 // get timing jitter against the other sources, and possibly also
518 // against the video display, although the latter is not as critical.)
519 // This requires our system clock to be reasonably close to the
520 // video clock, but that's not an unreasonable assumption.
521 steady_clock::time_point second_field_start = frame_upload_start +
522 nanoseconds(frame_length * 1000000000 / TIMEBASE);
523 this_thread::sleep_until(second_field_start);
527 unique_lock<mutex> lock(bmusb_mutex);
528 CaptureCard::NewFrame new_frame;
529 new_frame.frame = frame;
530 new_frame.length = frame_length;
531 new_frame.field = field;
532 new_frame.interlaced = video_format.interlaced;
533 new_frame.upload_func = upload_func;
534 new_frame.dropped_frames = dropped_frames;
535 card->new_frames.push(move(new_frame));
536 card->new_frames_changed.notify_all();
541 void Mixer::bm_hotplug_add(libusb_device *dev)
543 lock_guard<mutex> lock(hotplug_mutex);
544 hotplugged_cards.push_back(dev);
547 void Mixer::bm_hotplug_remove(unsigned card_index)
549 cards[card_index].new_frames_changed.notify_all();
552 void Mixer::thread_func()
554 eglBindAPI(EGL_OPENGL_API);
555 QOpenGLContext *context = create_context(mixer_surface);
556 if (!make_current(context, mixer_surface)) {
561 steady_clock::time_point start, now;
562 start = steady_clock::now();
565 int stats_dropped_frames = 0;
567 while (!should_quit) {
568 CaptureCard::NewFrame new_frames[MAX_CARDS];
569 bool has_new_frame[MAX_CARDS] = { false };
570 int num_samples[MAX_CARDS] = { 0 };
572 unsigned master_card_index = theme->map_signal(master_clock_channel);
573 assert(master_card_index < num_cards);
575 get_one_frame_from_each_card(master_card_index, new_frames, has_new_frame, num_samples);
576 schedule_audio_resampling_tasks(new_frames[master_card_index].dropped_frames, num_samples[master_card_index], new_frames[master_card_index].length);
577 stats_dropped_frames += new_frames[master_card_index].dropped_frames;
578 send_audio_level_callback();
580 handle_hotplugged_cards();
582 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
583 if (card_index == master_card_index || !has_new_frame[card_index]) {
586 if (new_frames[card_index].frame->len == 0) {
587 ++new_frames[card_index].dropped_frames;
589 if (new_frames[card_index].dropped_frames > 0) {
590 printf("Card %u dropped %d frames before this\n",
591 card_index, int(new_frames[card_index].dropped_frames));
595 // If the first card is reporting a corrupted or otherwise dropped frame,
596 // just increase the pts (skipping over this frame) and don't try to compute anything new.
597 if (new_frames[master_card_index].frame->len == 0) {
598 ++stats_dropped_frames;
599 pts_int += new_frames[master_card_index].length;
603 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
604 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
607 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
608 assert(new_frame->frame != nullptr);
609 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
612 // The new texture might need uploading before use.
613 if (new_frame->upload_func) {
614 new_frame->upload_func();
615 new_frame->upload_func = nullptr;
619 int64_t frame_duration = new_frames[master_card_index].length;
620 render_one_frame(frame_duration);
622 pts_int += frame_duration;
624 now = steady_clock::now();
625 double elapsed = duration<double>(now - start).count();
626 if (frame % 100 == 0) {
627 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
628 frame, stats_dropped_frames, elapsed, frame / elapsed,
629 1e3 * elapsed / frame);
630 // chain->print_phase_timing();
632 // Check our memory usage, to see if we are close to our mlockall()
633 // limit (if at all set).
635 if (getrusage(RUSAGE_SELF, &used) == -1) {
636 perror("getrusage(RUSAGE_SELF)");
642 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
643 perror("getrlimit(RLIMIT_MEMLOCK)");
647 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
648 long(used.ru_maxrss / 1024),
649 long(limit.rlim_cur / 1048576),
650 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
652 printf(", using %ld MB memory (not locked)",
653 long(used.ru_maxrss / 1024));
660 if (should_cut.exchange(false)) { // Test and clear.
661 video_encoder->do_cut(frame);
665 // Reset every 100 frames, so that local variations in frame times
666 // (especially for the first few frames, when the shaders are
667 // compiled etc.) don't make it hard to measure for the entire
668 // remaining duration of the program.
669 if (frame == 10000) {
677 resource_pool->clean_context();
680 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])
683 // The first card is the master timer, so wait for it to have a new frame.
684 // TODO: Add a timeout.
685 unique_lock<mutex> lock(bmusb_mutex);
686 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(); });
688 if (cards[master_card_index].new_frames.empty()) {
689 // We were woken up, but not due to a new frame. Deal with it
691 assert(cards[master_card_index].capture->get_disconnected());
692 handle_hotplugged_cards();
696 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
697 CaptureCard *card = &cards[card_index];
698 if (card->new_frames.empty()) {
699 assert(card_index != master_card_index);
700 card->queue_length_policy.update_policy(-1);
703 new_frames[card_index] = move(card->new_frames.front());
704 has_new_frame[card_index] = true;
705 card->new_frames.pop();
706 card->new_frames_changed.notify_all();
708 int num_samples_times_timebase = OUTPUT_FREQUENCY * new_frames[card_index].length + card->fractional_samples;
709 num_samples[card_index] = num_samples_times_timebase / TIMEBASE;
710 card->fractional_samples = num_samples_times_timebase % TIMEBASE;
711 assert(num_samples[card_index] >= 0);
713 if (card_index == master_card_index) {
714 // We don't use the queue length policy for the master card,
715 // but we will if it stops being the master. Thus, clear out
716 // the policy in case we switch in the future.
717 card->queue_length_policy.reset(card_index);
719 // If we have excess frames compared to the policy for this card,
720 // drop frames from the head.
721 card->queue_length_policy.update_policy(card->new_frames.size());
722 while (card->new_frames.size() > card->queue_length_policy.get_safe_queue_length()) {
723 card->new_frames.pop();
729 void Mixer::handle_hotplugged_cards()
731 // Check for cards that have been disconnected since last frame.
732 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
733 CaptureCard *card = &cards[card_index];
734 if (card->capture->get_disconnected()) {
735 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
736 FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
737 configure_card(card_index, capture, /*is_fake_capture=*/true);
738 card->queue_length_policy.reset(card_index);
739 card->capture->start_bm_capture();
743 // Check for cards that have been connected since last frame.
744 vector<libusb_device *> hotplugged_cards_copy;
746 lock_guard<mutex> lock(hotplug_mutex);
747 swap(hotplugged_cards, hotplugged_cards_copy);
749 for (libusb_device *new_dev : hotplugged_cards_copy) {
750 // Look for a fake capture card where we can stick this in.
751 int free_card_index = -1;
752 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
753 if (cards[card_index].is_fake_capture) {
754 free_card_index = int(card_index);
759 if (free_card_index == -1) {
760 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
761 libusb_unref_device(new_dev);
763 // BMUSBCapture takes ownership.
764 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
765 CaptureCard *card = &cards[free_card_index];
766 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
767 configure_card(free_card_index, capture, /*is_fake_capture=*/false);
768 card->queue_length_policy.reset(free_card_index);
769 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
770 capture->start_bm_capture();
776 void Mixer::schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame)
778 // Resample the audio as needed, including from previously dropped frames.
779 assert(num_cards > 0);
780 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
781 const bool dropped_frame = (frame_num != dropped_frames);
783 // Signal to the audio thread to process this frame.
784 // Note that if the frame is a dropped frame, we signal that
785 // we don't want to use this frame as base for adjusting
786 // the resampler rate. The reason for this is that the timing
787 // of these frames is often way too late; they typically don't
788 // “arrive” before we synthesize them. Thus, we could end up
789 // in a situation where we have inserted e.g. five audio frames
790 // into the queue before we then start pulling five of them
791 // back out. This makes ResamplingQueue overestimate the delay,
792 // causing undue resampler changes. (We _do_ use the last,
793 // non-dropped frame; perhaps we should just discard that as well,
794 // since dropped frames are expected to be rare, and it might be
795 // better to just wait until we have a slightly more normal situation).
796 unique_lock<mutex> lock(audio_mutex);
797 bool adjust_rate = !dropped_frame;
798 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate});
799 audio_task_queue_changed.notify_one();
802 // For dropped frames, increase the pts. Note that if the format changed
803 // in the meantime, we have no way of detecting that; we just have to
804 // assume the frame length is always the same.
805 pts_int += length_per_frame;
810 void Mixer::render_one_frame(int64_t duration)
812 // Get the main chain from the theme, and set its state immediately.
813 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT, input_state);
814 EffectChain *chain = theme_main_chain.chain;
815 theme_main_chain.setup_chain();
816 //theme_main_chain.chain->enable_phase_timing(true);
818 GLuint y_tex, cbcr_tex;
819 bool got_frame = video_encoder->begin_frame(&y_tex, &cbcr_tex);
822 // Render main chain.
823 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
824 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
825 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
827 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
828 resource_pool->release_fbo(fbo);
830 subsample_chroma(cbcr_full_tex, cbcr_tex);
831 resource_pool->release_2d_texture(cbcr_full_tex);
833 // Set the right state for rgba_tex.
834 glBindFramebuffer(GL_FRAMEBUFFER, 0);
835 glBindTexture(GL_TEXTURE_2D, rgba_tex);
836 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
837 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
838 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
840 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
841 RefCountedGLsync fence = video_encoder->end_frame(pts_int + av_delay, duration, theme_main_chain.input_frames);
843 // The live frame just shows the RGBA texture we just rendered.
844 // It owns rgba_tex now.
845 DisplayFrame live_frame;
846 live_frame.chain = display_chain.get();
847 live_frame.setup_chain = [this, rgba_tex]{
848 display_input->set_texture_num(rgba_tex);
850 live_frame.ready_fence = fence;
851 live_frame.input_frames = {};
852 live_frame.temp_textures = { rgba_tex };
853 output_channel[OUTPUT_LIVE].output_frame(live_frame);
855 // Set up preview and any additional channels.
856 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
857 DisplayFrame display_frame;
858 Theme::Chain chain = theme->get_chain(i, pts(), WIDTH, HEIGHT, input_state); // FIXME: dimensions
859 display_frame.chain = chain.chain;
860 display_frame.setup_chain = chain.setup_chain;
861 display_frame.ready_fence = fence;
862 display_frame.input_frames = chain.input_frames;
863 display_frame.temp_textures = {};
864 output_channel[i].output_frame(display_frame);
868 void Mixer::send_audio_level_callback()
870 if (audio_level_callback == nullptr) {
874 unique_lock<mutex> lock(audio_measure_mutex);
875 double loudness_s = r128.loudness_S();
876 double loudness_i = r128.integrated();
877 double loudness_range_low = r128.range_min();
878 double loudness_range_high = r128.range_max();
880 audio_level_callback(loudness_s, to_db(peak),
881 loudness_i, loudness_range_low, loudness_range_high,
882 audio_mixer.get_gain_staging_db(),
883 audio_mixer.get_final_makeup_gain_db(),
884 correlation.get_correlation());
887 void Mixer::audio_thread_func()
889 while (!should_quit) {
893 unique_lock<mutex> lock(audio_mutex);
894 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
898 task = audio_task_queue.front();
899 audio_task_queue.pop();
902 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
903 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
904 process_audio_one_frame(task.pts_int, task.num_samples, rate_adjustment_policy);
908 void Mixer::process_audio_one_frame(int64_t frame_pts_int, int num_samples, ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy)
910 vector<float> samples_out = audio_mixer.get_output(double(frame_pts_int) / TIMEBASE, num_samples, rate_adjustment_policy);
912 // Upsample 4x to find interpolated peak.
913 peak_resampler.inp_data = samples_out.data();
914 peak_resampler.inp_count = samples_out.size() / 2;
916 vector<float> interpolated_samples_out;
917 interpolated_samples_out.resize(samples_out.size());
919 unique_lock<mutex> lock(audio_measure_mutex);
921 while (peak_resampler.inp_count > 0) { // About four iterations.
922 peak_resampler.out_data = &interpolated_samples_out[0];
923 peak_resampler.out_count = interpolated_samples_out.size() / 2;
924 peak_resampler.process();
925 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
926 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
927 peak_resampler.out_data = nullptr;
931 // Find R128 levels and L/R correlation.
932 vector<float> left, right;
933 deinterleave_samples(samples_out, &left, &right);
934 float *ptrs[] = { left.data(), right.data() };
936 unique_lock<mutex> lock(audio_measure_mutex);
937 r128.process(left.size(), ptrs);
938 audio_mixer.set_current_loudness(r128.loudness_M());
939 correlation.process_samples(samples_out);
942 // Send the samples to the sound card.
944 alsa->write(samples_out);
947 // And finally add them to the output.
948 video_encoder->add_audio(frame_pts_int, move(samples_out));
951 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
954 glGenVertexArrays(1, &vao);
957 glBindVertexArray(vao);
961 GLuint fbo = resource_pool->create_fbo(dst_tex);
962 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
963 glViewport(0, 0, WIDTH/2, HEIGHT/2);
966 glUseProgram(cbcr_program_num);
969 glActiveTexture(GL_TEXTURE0);
971 glBindTexture(GL_TEXTURE_2D, src_tex);
973 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
975 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
977 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
980 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
981 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
983 glBindBuffer(GL_ARRAY_BUFFER, cbcr_vbo);
986 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
987 glEnableVertexAttribArray(attr_index);
989 glVertexAttribPointer(attr_index, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
993 glDrawArrays(GL_TRIANGLES, 0, 3);
996 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
997 glDisableVertexAttribArray(attr_index);
1003 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1006 resource_pool->release_fbo(fbo);
1007 glDeleteVertexArrays(1, &vao);
1010 void Mixer::release_display_frame(DisplayFrame *frame)
1012 for (GLuint texnum : frame->temp_textures) {
1013 resource_pool->release_2d_texture(texnum);
1015 frame->temp_textures.clear();
1016 frame->ready_fence.reset();
1017 frame->input_frames.clear();
1022 mixer_thread = thread(&Mixer::thread_func, this);
1023 audio_thread = thread(&Mixer::audio_thread_func, this);
1029 audio_task_queue_changed.notify_one();
1030 mixer_thread.join();
1031 audio_thread.join();
1034 void Mixer::transition_clicked(int transition_num)
1036 theme->transition_clicked(transition_num, pts());
1039 void Mixer::channel_clicked(int preview_num)
1041 theme->channel_clicked(preview_num);
1044 void Mixer::reset_meters()
1046 unique_lock<mutex> lock(audio_measure_mutex);
1047 peak_resampler.reset();
1050 r128.integr_start();
1051 correlation.reset();
1054 void Mixer::start_mode_scanning(unsigned card_index)
1056 assert(card_index < num_cards);
1057 if (is_mode_scanning[card_index]) {
1060 is_mode_scanning[card_index] = true;
1061 mode_scanlist[card_index].clear();
1062 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1063 mode_scanlist[card_index].push_back(mode.first);
1065 assert(!mode_scanlist[card_index].empty());
1066 mode_scanlist_index[card_index] = 0;
1067 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1068 last_mode_scan_change[card_index] = steady_clock::now();
1071 Mixer::OutputChannel::~OutputChannel()
1073 if (has_current_frame) {
1074 parent->release_display_frame(¤t_frame);
1076 if (has_ready_frame) {
1077 parent->release_display_frame(&ready_frame);
1081 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1083 // Store this frame for display. Remove the ready frame if any
1084 // (it was seemingly never used).
1086 unique_lock<mutex> lock(frame_mutex);
1087 if (has_ready_frame) {
1088 parent->release_display_frame(&ready_frame);
1090 ready_frame = frame;
1091 has_ready_frame = true;
1094 if (new_frame_ready_callback) {
1095 new_frame_ready_callback();
1098 // Reduce the number of callbacks by filtering duplicates. The reason
1099 // why we bother doing this is that Qt seemingly can get into a state
1100 // where its builds up an essentially unbounded queue of signals,
1101 // consuming more and more memory, and there's no good way of collapsing
1102 // user-defined signals or limiting the length of the queue.
1103 if (transition_names_updated_callback) {
1104 vector<string> transition_names = global_mixer->get_transition_names();
1105 bool changed = false;
1106 if (transition_names.size() != last_transition_names.size()) {
1109 for (unsigned i = 0; i < transition_names.size(); ++i) {
1110 if (transition_names[i] != last_transition_names[i]) {
1117 transition_names_updated_callback(transition_names);
1118 last_transition_names = transition_names;
1121 if (name_updated_callback) {
1122 string name = global_mixer->get_channel_name(channel);
1123 if (name != last_name) {
1124 name_updated_callback(name);
1128 if (color_updated_callback) {
1129 string color = global_mixer->get_channel_color(channel);
1130 if (color != last_color) {
1131 color_updated_callback(color);
1137 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1139 unique_lock<mutex> lock(frame_mutex);
1140 if (!has_current_frame && !has_ready_frame) {
1144 if (has_current_frame && has_ready_frame) {
1145 // We have a new ready frame. Toss the current one.
1146 parent->release_display_frame(¤t_frame);
1147 has_current_frame = false;
1149 if (has_ready_frame) {
1150 assert(!has_current_frame);
1151 current_frame = ready_frame;
1152 ready_frame.ready_fence.reset(); // Drop the refcount.
1153 ready_frame.input_frames.clear(); // Drop the refcounts.
1154 has_current_frame = true;
1155 has_ready_frame = false;
1158 *frame = current_frame;
1162 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1164 new_frame_ready_callback = callback;
1167 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1169 transition_names_updated_callback = callback;
1172 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1174 name_updated_callback = callback;
1177 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1179 color_updated_callback = callback;
1182 mutex RefCountedGLsync::fence_lock;