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"
36 #include "decklink_capture.h"
38 #include "disk_space_estimator.h"
40 #include "pbo_frame_allocator.h"
41 #include "ref_counted_gl_sync.h"
43 #include "video_encoder.h"
47 using namespace movit;
49 using namespace std::chrono;
50 using namespace std::placeholders;
51 using namespace bmusb;
53 Mixer *global_mixer = nullptr;
54 bool uses_mlock = false;
58 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
61 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
62 input_state->buffered_frames[card_index][frame_num] =
63 input_state->buffered_frames[card_index][frame_num - 1];
65 input_state->buffered_frames[card_index][0] = { frame, field_num };
67 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
68 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
75 void QueueLengthPolicy::update_policy(int queue_length)
77 if (queue_length < 0) { // Starvation.
78 if (been_at_safe_point_since_last_starvation && safe_queue_length < 5) {
80 fprintf(stderr, "Card %u: Starvation, increasing safe limit to %u frames\n",
81 card_index, safe_queue_length);
83 frames_with_at_least_one = 0;
84 been_at_safe_point_since_last_starvation = false;
87 if (queue_length > 0) {
88 if (queue_length >= int(safe_queue_length)) {
89 been_at_safe_point_since_last_starvation = true;
91 if (++frames_with_at_least_one >= 1000 && safe_queue_length > 0) {
93 fprintf(stderr, "Card %u: Spare frames for more than 1000 frames, reducing safe limit to %u frames\n",
94 card_index, safe_queue_length);
95 frames_with_at_least_one = 0;
98 frames_with_at_least_one = 0;
102 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
104 num_cards(num_cards),
105 mixer_surface(create_surface(format)),
106 h264_encoder_surface(create_surface(format)),
107 audio_mixer(num_cards),
108 correlation(OUTPUT_FREQUENCY)
110 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
113 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
114 // will be halved when sampling them, and we need to compensate here.
115 movit_texel_subpixel_precision /= 2.0;
117 resource_pool.reset(new ResourcePool);
118 theme.reset(new Theme(global_flags.theme_filename, global_flags.theme_dirs, resource_pool.get(), num_cards));
119 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
120 output_channel[i].parent = this;
121 output_channel[i].channel = i;
124 ImageFormat inout_format;
125 inout_format.color_space = COLORSPACE_sRGB;
126 inout_format.gamma_curve = GAMMA_sRGB;
128 // Display chain; shows the live output produced by the main chain (its RGBA version).
129 display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
131 display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT); // FIXME: GL_UNSIGNED_BYTE is really wrong.
132 display_chain->add_input(display_input);
133 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
134 display_chain->set_dither_bits(0); // Don't bother.
135 display_chain->finalize();
137 video_encoder.reset(new VideoEncoder(resource_pool.get(), h264_encoder_surface, global_flags.va_display, WIDTH, HEIGHT, &httpd, global_disk_space_estimator));
139 // Start listening for clients only once VideoEncoder has written its header, if any.
142 // First try initializing the then PCI devices, then USB, then
143 // fill up with fake cards until we have the desired number of cards.
144 unsigned num_pci_devices = 0;
145 unsigned card_index = 0;
148 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
149 if (decklink_iterator != nullptr) {
150 for ( ; card_index < num_cards; ++card_index) {
152 if (decklink_iterator->Next(&decklink) != S_OK) {
156 configure_card(card_index, new DeckLinkCapture(decklink, card_index), /*is_fake_capture=*/false);
159 decklink_iterator->Release();
160 fprintf(stderr, "Found %u DeckLink PCI card(s).\n", num_pci_devices);
162 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
165 unsigned num_usb_devices = BMUSBCapture::num_cards();
166 for (unsigned usb_card_index = 0; usb_card_index < num_usb_devices && card_index < num_cards; ++usb_card_index, ++card_index) {
167 BMUSBCapture *capture = new BMUSBCapture(usb_card_index);
168 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, card_index));
169 configure_card(card_index, capture, /*is_fake_capture=*/false);
171 fprintf(stderr, "Found %u USB card(s).\n", num_usb_devices);
173 unsigned num_fake_cards = 0;
174 for ( ; card_index < num_cards; ++card_index, ++num_fake_cards) {
175 FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
176 configure_card(card_index, capture, /*is_fake_capture=*/true);
179 if (num_fake_cards > 0) {
180 fprintf(stderr, "Initialized %u fake cards.\n", num_fake_cards);
183 BMUSBCapture::set_card_connected_callback(bind(&Mixer::bm_hotplug_add, this, _1));
184 BMUSBCapture::start_bm_thread();
186 for (card_index = 0; card_index < num_cards; ++card_index) {
187 cards[card_index].queue_length_policy.reset(card_index);
188 cards[card_index].capture->start_bm_capture();
191 // Set up stuff for NV12 conversion.
194 string cbcr_vert_shader =
197 "in vec2 position; \n"
198 "in vec2 texcoord; \n"
200 "uniform vec2 foo_chroma_offset_0; \n"
204 " // The result of glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0) is: \n"
206 " // 2.000 0.000 0.000 -1.000 \n"
207 " // 0.000 2.000 0.000 -1.000 \n"
208 " // 0.000 0.000 -2.000 -1.000 \n"
209 " // 0.000 0.000 0.000 1.000 \n"
210 " gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0); \n"
211 " vec2 flipped_tc = texcoord; \n"
212 " tc0 = flipped_tc + foo_chroma_offset_0; \n"
214 string cbcr_frag_shader =
217 "uniform sampler2D cbcr_tex; \n"
218 "out vec4 FragColor; \n"
220 " FragColor = texture(cbcr_tex, tc0); \n"
222 vector<string> frag_shader_outputs;
223 cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader, frag_shader_outputs);
230 cbcr_vbo = generate_vbo(2, GL_FLOAT, sizeof(vertices), vertices);
231 cbcr_position_attribute_index = glGetAttribLocation(cbcr_program_num, "position");
232 cbcr_texcoord_attribute_index = glGetAttribLocation(cbcr_program_num, "texcoord");
234 r128.init(2, OUTPUT_FREQUENCY);
237 // hlen=16 is pretty low quality, but we use quite a bit of CPU otherwise,
238 // and there's a limit to how important the peak meter is.
239 peak_resampler.setup(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY * 4, /*num_channels=*/2, /*hlen=*/16, /*frel=*/1.0);
241 if (global_flags.enable_alsa_output) {
242 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
248 resource_pool->release_glsl_program(cbcr_program_num);
249 glDeleteBuffers(1, &cbcr_vbo);
250 BMUSBCapture::stop_bm_thread();
252 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
254 unique_lock<mutex> lock(bmusb_mutex);
255 cards[card_index].should_quit = true; // Unblock thread.
256 cards[card_index].new_frames_changed.notify_all();
258 cards[card_index].capture->stop_dequeue_thread();
261 video_encoder.reset(nullptr);
264 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, bool is_fake_capture)
266 printf("Configuring card %d...\n", card_index);
268 CaptureCard *card = &cards[card_index];
269 if (card->capture != nullptr) {
270 card->capture->stop_dequeue_thread();
271 delete card->capture;
273 card->capture = capture;
274 card->is_fake_capture = is_fake_capture;
275 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
276 if (card->frame_allocator == nullptr) {
277 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, WIDTH, HEIGHT)); // 8 MB.
279 card->capture->set_video_frame_allocator(card->frame_allocator.get());
280 if (card->surface == nullptr) {
281 card->surface = create_surface_with_same_format(mixer_surface);
283 audio_mixer.reset_card(card_index);
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();
293 int unwrap_timecode(uint16_t current_wrapped, int last)
295 uint16_t last_wrapped = last & 0xffff;
296 if (current_wrapped > last_wrapped) {
297 return (last & ~0xffff) | current_wrapped;
299 return 0x10000 + ((last & ~0xffff) | current_wrapped);
303 float find_peak(const float *samples, size_t num_samples)
305 float m = fabs(samples[0]);
306 for (size_t i = 1; i < num_samples; ++i) {
307 m = max(m, fabs(samples[i]));
312 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
314 size_t num_samples = in.size() / 2;
315 out_l->resize(num_samples);
316 out_r->resize(num_samples);
318 const float *inptr = in.data();
319 float *lptr = &(*out_l)[0];
320 float *rptr = &(*out_r)[0];
321 for (size_t i = 0; i < num_samples; ++i) {
329 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
330 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
331 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
333 CaptureCard *card = &cards[card_index];
335 if (is_mode_scanning[card_index]) {
336 if (video_format.has_signal) {
337 // Found a stable signal, so stop scanning.
338 is_mode_scanning[card_index] = false;
340 static constexpr double switch_time_s = 0.5; // Should be enough time for the signal to stabilize.
341 steady_clock::time_point now = steady_clock::now();
342 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
343 if (sec_since_last_switch > switch_time_s) {
344 // It isn't this mode; try the next one.
345 mode_scanlist_index[card_index]++;
346 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
347 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
348 last_mode_scan_change[card_index] = now;
353 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
354 assert(frame_length > 0);
356 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;
357 if (num_samples > OUTPUT_FREQUENCY / 10) {
358 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",
359 card_index, int(audio_frame.len), int(audio_offset),
360 timecode, int(video_frame.len), int(video_offset), video_format.id);
361 if (video_frame.owner) {
362 video_frame.owner->release_frame(video_frame);
364 if (audio_frame.owner) {
365 audio_frame.owner->release_frame(audio_frame);
370 int dropped_frames = 0;
371 if (card->last_timecode != -1) {
372 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
375 // Number of samples per frame if we need to insert silence.
376 // (Could be nonintegral, but resampling will save us then.)
377 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
379 if (dropped_frames > MAX_FPS * 2) {
380 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
381 card_index, card->last_timecode, timecode);
382 audio_mixer.reset_card(card_index);
384 } else if (dropped_frames > 0) {
385 // Insert silence as needed.
386 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
387 card_index, dropped_frames, timecode);
389 audio_mixer.add_silence(card_index, silence_samples, dropped_frames, frame_length);
392 audio_mixer.add_audio(card_index, audio_frame.data + audio_offset, num_samples, audio_format, frame_length);
394 // Done with the audio, so release it.
395 if (audio_frame.owner) {
396 audio_frame.owner->release_frame(audio_frame);
399 card->last_timecode = timecode;
401 size_t expected_length = video_format.width * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom) * 2;
402 if (video_frame.len - video_offset == 0 ||
403 video_frame.len - video_offset != expected_length) {
404 if (video_frame.len != 0) {
405 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
406 card_index, video_frame.len - video_offset, expected_length);
408 if (video_frame.owner) {
409 video_frame.owner->release_frame(video_frame);
412 // Still send on the information that we _had_ a frame, even though it's corrupted,
413 // so that pts can go up accordingly.
415 unique_lock<mutex> lock(bmusb_mutex);
416 CaptureCard::NewFrame new_frame;
417 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
418 new_frame.length = frame_length;
419 new_frame.interlaced = false;
420 new_frame.dropped_frames = dropped_frames;
421 card->new_frames.push(move(new_frame));
422 card->new_frames_changed.notify_all();
427 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
429 unsigned num_fields = video_format.interlaced ? 2 : 1;
430 steady_clock::time_point frame_upload_start;
431 if (video_format.interlaced) {
432 // Send the two fields along as separate frames; the other side will need to add
433 // a deinterlacer to actually get this right.
434 assert(video_format.height % 2 == 0);
435 video_format.height /= 2;
436 assert(frame_length % 2 == 0);
439 frame_upload_start = steady_clock::now();
441 userdata->last_interlaced = video_format.interlaced;
442 userdata->last_has_signal = video_format.has_signal;
443 userdata->last_is_connected = video_format.is_connected;
444 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
445 userdata->last_frame_rate_den = video_format.frame_rate_den;
446 RefCountedFrame frame(video_frame);
448 // Upload the textures.
449 size_t cbcr_width = video_format.width / 2;
450 size_t cbcr_offset = video_offset / 2;
451 size_t y_offset = video_frame.size / 2 + video_offset / 2;
453 for (unsigned field = 0; field < num_fields; ++field) {
454 // Put the actual texture upload in a lambda that is executed in the main thread.
455 // It is entirely possible to do this in the same thread (and it might even be
456 // faster, depending on the GPU and driver), but it appears to be trickling
457 // driver bugs very easily.
459 // Note that this means we must hold on to the actual frame data in <userdata>
460 // until the upload command is run, but we hold on to <frame> much longer than that
461 // (in fact, all the way until we no longer use the texture in rendering).
462 auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, userdata]() {
463 unsigned field_start_line = (field == 1) ? video_format.second_field_start : video_format.extra_lines_top + field * (video_format.height + 22);
465 if (userdata->tex_y[field] == 0 ||
466 userdata->tex_cbcr[field] == 0 ||
467 video_format.width != userdata->last_width[field] ||
468 video_format.height != userdata->last_height[field]) {
469 // We changed resolution since last use of this texture, so we need to create
470 // a new object. Note that this each card has its own PBOFrameAllocator,
471 // we don't need to worry about these flip-flopping between resolutions.
472 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
474 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, video_format.height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
476 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
478 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, video_format.width, video_format.height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
480 userdata->last_width[field] = video_format.width;
481 userdata->last_height[field] = video_format.height;
484 GLuint pbo = userdata->pbo;
486 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
489 size_t field_y_start = y_offset + video_format.width * field_start_line;
490 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
492 if (global_flags.flush_pbos) {
493 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_y_start, video_format.width * video_format.height);
495 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_cbcr_start, cbcr_width * video_format.height * sizeof(uint16_t));
499 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
501 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, video_format.height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_cbcr_start));
503 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
505 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, video_format.width, video_format.height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_y_start));
507 glBindTexture(GL_TEXTURE_2D, 0);
509 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
514 // Don't upload the second field as fast as we can; wait until
515 // the field time has approximately passed. (Otherwise, we could
516 // get timing jitter against the other sources, and possibly also
517 // against the video display, although the latter is not as critical.)
518 // This requires our system clock to be reasonably close to the
519 // video clock, but that's not an unreasonable assumption.
520 steady_clock::time_point second_field_start = frame_upload_start +
521 nanoseconds(frame_length * 1000000000 / TIMEBASE);
522 this_thread::sleep_until(second_field_start);
526 unique_lock<mutex> lock(bmusb_mutex);
527 CaptureCard::NewFrame new_frame;
528 new_frame.frame = frame;
529 new_frame.length = frame_length;
530 new_frame.field = field;
531 new_frame.interlaced = video_format.interlaced;
532 new_frame.upload_func = upload_func;
533 new_frame.dropped_frames = dropped_frames;
534 card->new_frames.push(move(new_frame));
535 card->new_frames_changed.notify_all();
540 void Mixer::bm_hotplug_add(libusb_device *dev)
542 lock_guard<mutex> lock(hotplug_mutex);
543 hotplugged_cards.push_back(dev);
546 void Mixer::bm_hotplug_remove(unsigned card_index)
548 cards[card_index].new_frames_changed.notify_all();
551 void Mixer::thread_func()
553 eglBindAPI(EGL_OPENGL_API);
554 QOpenGLContext *context = create_context(mixer_surface);
555 if (!make_current(context, mixer_surface)) {
560 steady_clock::time_point start, now;
561 start = steady_clock::now();
564 int stats_dropped_frames = 0;
566 while (!should_quit) {
567 CaptureCard::NewFrame new_frames[MAX_CARDS];
568 bool has_new_frame[MAX_CARDS] = { false };
569 int num_samples[MAX_CARDS] = { 0 };
571 unsigned master_card_index = theme->map_signal(master_clock_channel);
572 assert(master_card_index < num_cards);
574 get_one_frame_from_each_card(master_card_index, new_frames, has_new_frame, num_samples);
575 schedule_audio_resampling_tasks(new_frames[master_card_index].dropped_frames, num_samples[master_card_index], new_frames[master_card_index].length);
576 stats_dropped_frames += new_frames[master_card_index].dropped_frames;
577 send_audio_level_callback();
579 handle_hotplugged_cards();
581 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
582 if (card_index == master_card_index || !has_new_frame[card_index]) {
585 if (new_frames[card_index].frame->len == 0) {
586 ++new_frames[card_index].dropped_frames;
588 if (new_frames[card_index].dropped_frames > 0) {
589 printf("Card %u dropped %d frames before this\n",
590 card_index, int(new_frames[card_index].dropped_frames));
594 // If the first card is reporting a corrupted or otherwise dropped frame,
595 // just increase the pts (skipping over this frame) and don't try to compute anything new.
596 if (new_frames[master_card_index].frame->len == 0) {
597 ++stats_dropped_frames;
598 pts_int += new_frames[master_card_index].length;
602 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
603 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
606 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
607 assert(new_frame->frame != nullptr);
608 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
611 // The new texture might need uploading before use.
612 if (new_frame->upload_func) {
613 new_frame->upload_func();
614 new_frame->upload_func = nullptr;
618 int64_t frame_duration = new_frames[master_card_index].length;
619 render_one_frame(frame_duration);
621 pts_int += frame_duration;
623 now = steady_clock::now();
624 double elapsed = duration<double>(now - start).count();
625 if (frame % 100 == 0) {
626 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
627 frame, stats_dropped_frames, elapsed, frame / elapsed,
628 1e3 * elapsed / frame);
629 // chain->print_phase_timing();
631 // Check our memory usage, to see if we are close to our mlockall()
632 // limit (if at all set).
634 if (getrusage(RUSAGE_SELF, &used) == -1) {
635 perror("getrusage(RUSAGE_SELF)");
641 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
642 perror("getrlimit(RLIMIT_MEMLOCK)");
646 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
647 long(used.ru_maxrss / 1024),
648 long(limit.rlim_cur / 1048576),
649 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
651 printf(", using %ld MB memory (not locked)",
652 long(used.ru_maxrss / 1024));
659 if (should_cut.exchange(false)) { // Test and clear.
660 video_encoder->do_cut(frame);
664 // Reset every 100 frames, so that local variations in frame times
665 // (especially for the first few frames, when the shaders are
666 // compiled etc.) don't make it hard to measure for the entire
667 // remaining duration of the program.
668 if (frame == 10000) {
676 resource_pool->clean_context();
679 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])
682 // The first card is the master timer, so wait for it to have a new frame.
683 // TODO: Add a timeout.
684 unique_lock<mutex> lock(bmusb_mutex);
685 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(); });
687 if (cards[master_card_index].new_frames.empty()) {
688 // We were woken up, but not due to a new frame. Deal with it
690 assert(cards[master_card_index].capture->get_disconnected());
691 handle_hotplugged_cards();
695 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
696 CaptureCard *card = &cards[card_index];
697 if (card->new_frames.empty()) {
698 assert(card_index != master_card_index);
699 card->queue_length_policy.update_policy(-1);
702 new_frames[card_index] = move(card->new_frames.front());
703 has_new_frame[card_index] = true;
704 card->new_frames.pop();
705 card->new_frames_changed.notify_all();
707 int num_samples_times_timebase = OUTPUT_FREQUENCY * new_frames[card_index].length + card->fractional_samples;
708 num_samples[card_index] = num_samples_times_timebase / TIMEBASE;
709 card->fractional_samples = num_samples_times_timebase % TIMEBASE;
710 assert(num_samples[card_index] >= 0);
712 if (card_index == master_card_index) {
713 // We don't use the queue length policy for the master card,
714 // but we will if it stops being the master. Thus, clear out
715 // the policy in case we switch in the future.
716 card->queue_length_policy.reset(card_index);
718 // If we have excess frames compared to the policy for this card,
719 // drop frames from the head.
720 card->queue_length_policy.update_policy(card->new_frames.size());
721 while (card->new_frames.size() > card->queue_length_policy.get_safe_queue_length()) {
722 card->new_frames.pop();
728 void Mixer::handle_hotplugged_cards()
730 // Check for cards that have been disconnected since last frame.
731 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
732 CaptureCard *card = &cards[card_index];
733 if (card->capture->get_disconnected()) {
734 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
735 FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
736 configure_card(card_index, capture, /*is_fake_capture=*/true);
737 card->queue_length_policy.reset(card_index);
738 card->capture->start_bm_capture();
742 // Check for cards that have been connected since last frame.
743 vector<libusb_device *> hotplugged_cards_copy;
745 lock_guard<mutex> lock(hotplug_mutex);
746 swap(hotplugged_cards, hotplugged_cards_copy);
748 for (libusb_device *new_dev : hotplugged_cards_copy) {
749 // Look for a fake capture card where we can stick this in.
750 int free_card_index = -1;
751 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
752 if (cards[card_index].is_fake_capture) {
753 free_card_index = int(card_index);
758 if (free_card_index == -1) {
759 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
760 libusb_unref_device(new_dev);
762 // BMUSBCapture takes ownership.
763 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
764 CaptureCard *card = &cards[free_card_index];
765 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
766 configure_card(free_card_index, capture, /*is_fake_capture=*/false);
767 card->queue_length_policy.reset(free_card_index);
768 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
769 capture->start_bm_capture();
775 void Mixer::schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame)
777 // Resample the audio as needed, including from previously dropped frames.
778 assert(num_cards > 0);
779 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
780 const bool dropped_frame = (frame_num != dropped_frames);
782 // Signal to the audio thread to process this frame.
783 // Note that if the frame is a dropped frame, we signal that
784 // we don't want to use this frame as base for adjusting
785 // the resampler rate. The reason for this is that the timing
786 // of these frames is often way too late; they typically don't
787 // “arrive” before we synthesize them. Thus, we could end up
788 // in a situation where we have inserted e.g. five audio frames
789 // into the queue before we then start pulling five of them
790 // back out. This makes ResamplingQueue overestimate the delay,
791 // causing undue resampler changes. (We _do_ use the last,
792 // non-dropped frame; perhaps we should just discard that as well,
793 // since dropped frames are expected to be rare, and it might be
794 // better to just wait until we have a slightly more normal situation).
795 unique_lock<mutex> lock(audio_mutex);
796 bool adjust_rate = !dropped_frame;
797 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate});
798 audio_task_queue_changed.notify_one();
801 // For dropped frames, increase the pts. Note that if the format changed
802 // in the meantime, we have no way of detecting that; we just have to
803 // assume the frame length is always the same.
804 pts_int += length_per_frame;
809 void Mixer::render_one_frame(int64_t duration)
811 // Get the main chain from the theme, and set its state immediately.
812 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT, input_state);
813 EffectChain *chain = theme_main_chain.chain;
814 theme_main_chain.setup_chain();
815 //theme_main_chain.chain->enable_phase_timing(true);
817 GLuint y_tex, cbcr_tex;
818 bool got_frame = video_encoder->begin_frame(&y_tex, &cbcr_tex);
821 // Render main chain.
822 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
823 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
824 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
826 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
827 resource_pool->release_fbo(fbo);
829 subsample_chroma(cbcr_full_tex, cbcr_tex);
830 resource_pool->release_2d_texture(cbcr_full_tex);
832 // Set the right state for rgba_tex.
833 glBindFramebuffer(GL_FRAMEBUFFER, 0);
834 glBindTexture(GL_TEXTURE_2D, rgba_tex);
835 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
836 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
837 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
839 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
840 RefCountedGLsync fence = video_encoder->end_frame(pts_int + av_delay, duration, theme_main_chain.input_frames);
842 // The live frame just shows the RGBA texture we just rendered.
843 // It owns rgba_tex now.
844 DisplayFrame live_frame;
845 live_frame.chain = display_chain.get();
846 live_frame.setup_chain = [this, rgba_tex]{
847 display_input->set_texture_num(rgba_tex);
849 live_frame.ready_fence = fence;
850 live_frame.input_frames = {};
851 live_frame.temp_textures = { rgba_tex };
852 output_channel[OUTPUT_LIVE].output_frame(live_frame);
854 // Set up preview and any additional channels.
855 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
856 DisplayFrame display_frame;
857 Theme::Chain chain = theme->get_chain(i, pts(), WIDTH, HEIGHT, input_state); // FIXME: dimensions
858 display_frame.chain = chain.chain;
859 display_frame.setup_chain = chain.setup_chain;
860 display_frame.ready_fence = fence;
861 display_frame.input_frames = chain.input_frames;
862 display_frame.temp_textures = {};
863 output_channel[i].output_frame(display_frame);
867 void Mixer::send_audio_level_callback()
869 if (audio_level_callback == nullptr) {
873 unique_lock<mutex> lock(audio_measure_mutex);
874 double loudness_s = r128.loudness_S();
875 double loudness_i = r128.integrated();
876 double loudness_range_low = r128.range_min();
877 double loudness_range_high = r128.range_max();
879 audio_level_callback(loudness_s, 20.0 * log10(peak),
880 loudness_i, loudness_range_low, loudness_range_high,
881 audio_mixer.get_gain_staging_db(),
882 audio_mixer.get_final_makeup_gain_db(),
883 correlation.get_correlation());
886 void Mixer::audio_thread_func()
888 while (!should_quit) {
892 unique_lock<mutex> lock(audio_mutex);
893 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
897 task = audio_task_queue.front();
898 audio_task_queue.pop();
901 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
902 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
903 process_audio_one_frame(task.pts_int, task.num_samples, rate_adjustment_policy);
907 void Mixer::process_audio_one_frame(int64_t frame_pts_int, int num_samples, ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy)
909 vector<float> samples_out = audio_mixer.get_output(double(frame_pts_int) / TIMEBASE, num_samples, rate_adjustment_policy);
911 // Upsample 4x to find interpolated peak.
912 peak_resampler.inp_data = samples_out.data();
913 peak_resampler.inp_count = samples_out.size() / 2;
915 vector<float> interpolated_samples_out;
916 interpolated_samples_out.resize(samples_out.size());
918 unique_lock<mutex> lock(audio_measure_mutex);
920 while (peak_resampler.inp_count > 0) { // About four iterations.
921 peak_resampler.out_data = &interpolated_samples_out[0];
922 peak_resampler.out_count = interpolated_samples_out.size() / 2;
923 peak_resampler.process();
924 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
925 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
926 peak_resampler.out_data = nullptr;
930 // Find R128 levels and L/R correlation.
931 vector<float> left, right;
932 deinterleave_samples(samples_out, &left, &right);
933 float *ptrs[] = { left.data(), right.data() };
935 unique_lock<mutex> lock(audio_measure_mutex);
936 r128.process(left.size(), ptrs);
937 audio_mixer.set_current_loudness(r128.loudness_M());
938 correlation.process_samples(samples_out);
941 // Send the samples to the sound card.
943 alsa->write(samples_out);
946 // And finally add them to the output.
947 video_encoder->add_audio(frame_pts_int, move(samples_out));
950 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
953 glGenVertexArrays(1, &vao);
956 glBindVertexArray(vao);
960 GLuint fbo = resource_pool->create_fbo(dst_tex);
961 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
962 glViewport(0, 0, WIDTH/2, HEIGHT/2);
965 glUseProgram(cbcr_program_num);
968 glActiveTexture(GL_TEXTURE0);
970 glBindTexture(GL_TEXTURE_2D, src_tex);
972 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
974 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
976 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
979 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
980 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
982 glBindBuffer(GL_ARRAY_BUFFER, cbcr_vbo);
985 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
986 glEnableVertexAttribArray(attr_index);
988 glVertexAttribPointer(attr_index, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
992 glDrawArrays(GL_TRIANGLES, 0, 3);
995 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
996 glDisableVertexAttribArray(attr_index);
1002 glBindFramebuffer(GL_FRAMEBUFFER, 0);
1005 resource_pool->release_fbo(fbo);
1006 glDeleteVertexArrays(1, &vao);
1009 void Mixer::release_display_frame(DisplayFrame *frame)
1011 for (GLuint texnum : frame->temp_textures) {
1012 resource_pool->release_2d_texture(texnum);
1014 frame->temp_textures.clear();
1015 frame->ready_fence.reset();
1016 frame->input_frames.clear();
1021 mixer_thread = thread(&Mixer::thread_func, this);
1022 audio_thread = thread(&Mixer::audio_thread_func, this);
1028 audio_task_queue_changed.notify_one();
1029 mixer_thread.join();
1030 audio_thread.join();
1033 void Mixer::transition_clicked(int transition_num)
1035 theme->transition_clicked(transition_num, pts());
1038 void Mixer::channel_clicked(int preview_num)
1040 theme->channel_clicked(preview_num);
1043 void Mixer::reset_meters()
1045 unique_lock<mutex> lock(audio_measure_mutex);
1046 peak_resampler.reset();
1049 r128.integr_start();
1050 correlation.reset();
1053 void Mixer::start_mode_scanning(unsigned card_index)
1055 assert(card_index < num_cards);
1056 if (is_mode_scanning[card_index]) {
1059 is_mode_scanning[card_index] = true;
1060 mode_scanlist[card_index].clear();
1061 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
1062 mode_scanlist[card_index].push_back(mode.first);
1064 assert(!mode_scanlist[card_index].empty());
1065 mode_scanlist_index[card_index] = 0;
1066 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
1067 last_mode_scan_change[card_index] = steady_clock::now();
1070 Mixer::OutputChannel::~OutputChannel()
1072 if (has_current_frame) {
1073 parent->release_display_frame(¤t_frame);
1075 if (has_ready_frame) {
1076 parent->release_display_frame(&ready_frame);
1080 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1082 // Store this frame for display. Remove the ready frame if any
1083 // (it was seemingly never used).
1085 unique_lock<mutex> lock(frame_mutex);
1086 if (has_ready_frame) {
1087 parent->release_display_frame(&ready_frame);
1089 ready_frame = frame;
1090 has_ready_frame = true;
1093 if (new_frame_ready_callback) {
1094 new_frame_ready_callback();
1097 // Reduce the number of callbacks by filtering duplicates. The reason
1098 // why we bother doing this is that Qt seemingly can get into a state
1099 // where its builds up an essentially unbounded queue of signals,
1100 // consuming more and more memory, and there's no good way of collapsing
1101 // user-defined signals or limiting the length of the queue.
1102 if (transition_names_updated_callback) {
1103 vector<string> transition_names = global_mixer->get_transition_names();
1104 bool changed = false;
1105 if (transition_names.size() != last_transition_names.size()) {
1108 for (unsigned i = 0; i < transition_names.size(); ++i) {
1109 if (transition_names[i] != last_transition_names[i]) {
1116 transition_names_updated_callback(transition_names);
1117 last_transition_names = transition_names;
1120 if (name_updated_callback) {
1121 string name = global_mixer->get_channel_name(channel);
1122 if (name != last_name) {
1123 name_updated_callback(name);
1127 if (color_updated_callback) {
1128 string color = global_mixer->get_channel_color(channel);
1129 if (color != last_color) {
1130 color_updated_callback(color);
1136 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1138 unique_lock<mutex> lock(frame_mutex);
1139 if (!has_current_frame && !has_ready_frame) {
1143 if (has_current_frame && has_ready_frame) {
1144 // We have a new ready frame. Toss the current one.
1145 parent->release_display_frame(¤t_frame);
1146 has_current_frame = false;
1148 if (has_ready_frame) {
1149 assert(!has_current_frame);
1150 current_frame = ready_frame;
1151 ready_frame.ready_fence.reset(); // Drop the refcount.
1152 ready_frame.input_frames.clear(); // Drop the refcounts.
1153 has_current_frame = true;
1154 has_ready_frame = false;
1157 *frame = current_frame;
1161 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1163 new_frame_ready_callback = callback;
1166 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1168 transition_names_updated_callback = callback;
1171 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1173 name_updated_callback = callback;
1176 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1178 color_updated_callback = callback;
1181 mutex RefCountedGLsync::fence_lock;