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)
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 if (global_flags.enable_alsa_output) {
235 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
241 resource_pool->release_glsl_program(cbcr_program_num);
242 glDeleteBuffers(1, &cbcr_vbo);
243 BMUSBCapture::stop_bm_thread();
245 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
247 unique_lock<mutex> lock(bmusb_mutex);
248 cards[card_index].should_quit = true; // Unblock thread.
249 cards[card_index].new_frames_changed.notify_all();
251 cards[card_index].capture->stop_dequeue_thread();
254 video_encoder.reset(nullptr);
257 void Mixer::configure_card(unsigned card_index, CaptureInterface *capture, bool is_fake_capture)
259 printf("Configuring card %d...\n", card_index);
261 CaptureCard *card = &cards[card_index];
262 if (card->capture != nullptr) {
263 card->capture->stop_dequeue_thread();
264 delete card->capture;
266 card->capture = capture;
267 card->is_fake_capture = is_fake_capture;
268 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
269 if (card->frame_allocator == nullptr) {
270 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, WIDTH, HEIGHT)); // 8 MB.
272 card->capture->set_video_frame_allocator(card->frame_allocator.get());
273 if (card->surface == nullptr) {
274 card->surface = create_surface_with_same_format(mixer_surface);
276 while (!card->new_frames.empty()) card->new_frames.pop();
277 card->fractional_samples = 0;
278 card->last_timecode = -1;
279 card->capture->configure_card();
281 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
282 audio_mixer.reset_resampler(device);
283 audio_mixer.set_name(device, card->capture->get_description());
289 int unwrap_timecode(uint16_t current_wrapped, int last)
291 uint16_t last_wrapped = last & 0xffff;
292 if (current_wrapped > last_wrapped) {
293 return (last & ~0xffff) | current_wrapped;
295 return 0x10000 + ((last & ~0xffff) | current_wrapped);
301 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
302 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
303 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
305 DeviceSpec device{InputSourceType::CAPTURE_CARD, card_index};
306 CaptureCard *card = &cards[card_index];
308 if (is_mode_scanning[card_index]) {
309 if (video_format.has_signal) {
310 // Found a stable signal, so stop scanning.
311 is_mode_scanning[card_index] = false;
313 static constexpr double switch_time_s = 0.5; // Should be enough time for the signal to stabilize.
314 steady_clock::time_point now = steady_clock::now();
315 double sec_since_last_switch = duration<double>(steady_clock::now() - last_mode_scan_change[card_index]).count();
316 if (sec_since_last_switch > switch_time_s) {
317 // It isn't this mode; try the next one.
318 mode_scanlist_index[card_index]++;
319 mode_scanlist_index[card_index] %= mode_scanlist[card_index].size();
320 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][mode_scanlist_index[card_index]]);
321 last_mode_scan_change[card_index] = now;
326 int64_t frame_length = int64_t(TIMEBASE) * video_format.frame_rate_den / video_format.frame_rate_nom;
327 assert(frame_length > 0);
329 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;
330 if (num_samples > OUTPUT_FREQUENCY / 10) {
331 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",
332 card_index, int(audio_frame.len), int(audio_offset),
333 timecode, int(video_frame.len), int(video_offset), video_format.id);
334 if (video_frame.owner) {
335 video_frame.owner->release_frame(video_frame);
337 if (audio_frame.owner) {
338 audio_frame.owner->release_frame(audio_frame);
343 int dropped_frames = 0;
344 if (card->last_timecode != -1) {
345 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
348 // Number of samples per frame if we need to insert silence.
349 // (Could be nonintegral, but resampling will save us then.)
350 const int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
352 if (dropped_frames > MAX_FPS * 2) {
353 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
354 card_index, card->last_timecode, timecode);
355 audio_mixer.reset_resampler(device);
357 } else if (dropped_frames > 0) {
358 // Insert silence as needed.
359 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
360 card_index, dropped_frames, timecode);
364 success = audio_mixer.add_silence(device, silence_samples, dropped_frames, frame_length);
368 audio_mixer.add_audio(device, audio_frame.data + audio_offset, num_samples, audio_format, frame_length);
370 // Done with the audio, so release it.
371 if (audio_frame.owner) {
372 audio_frame.owner->release_frame(audio_frame);
375 card->last_timecode = timecode;
377 size_t expected_length = video_format.width * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom) * 2;
378 if (video_frame.len - video_offset == 0 ||
379 video_frame.len - video_offset != expected_length) {
380 if (video_frame.len != 0) {
381 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
382 card_index, video_frame.len - video_offset, expected_length);
384 if (video_frame.owner) {
385 video_frame.owner->release_frame(video_frame);
388 // Still send on the information that we _had_ a frame, even though it's corrupted,
389 // so that pts can go up accordingly.
391 unique_lock<mutex> lock(bmusb_mutex);
392 CaptureCard::NewFrame new_frame;
393 new_frame.frame = RefCountedFrame(FrameAllocator::Frame());
394 new_frame.length = frame_length;
395 new_frame.interlaced = false;
396 new_frame.dropped_frames = dropped_frames;
397 card->new_frames.push(move(new_frame));
398 card->new_frames_changed.notify_all();
403 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
405 unsigned num_fields = video_format.interlaced ? 2 : 1;
406 steady_clock::time_point frame_upload_start;
407 if (video_format.interlaced) {
408 // Send the two fields along as separate frames; the other side will need to add
409 // a deinterlacer to actually get this right.
410 assert(video_format.height % 2 == 0);
411 video_format.height /= 2;
412 assert(frame_length % 2 == 0);
415 frame_upload_start = steady_clock::now();
417 userdata->last_interlaced = video_format.interlaced;
418 userdata->last_has_signal = video_format.has_signal;
419 userdata->last_is_connected = video_format.is_connected;
420 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
421 userdata->last_frame_rate_den = video_format.frame_rate_den;
422 RefCountedFrame frame(video_frame);
424 // Upload the textures.
425 size_t cbcr_width = video_format.width / 2;
426 size_t cbcr_offset = video_offset / 2;
427 size_t y_offset = video_frame.size / 2 + video_offset / 2;
429 for (unsigned field = 0; field < num_fields; ++field) {
430 // Put the actual texture upload in a lambda that is executed in the main thread.
431 // It is entirely possible to do this in the same thread (and it might even be
432 // faster, depending on the GPU and driver), but it appears to be trickling
433 // driver bugs very easily.
435 // Note that this means we must hold on to the actual frame data in <userdata>
436 // until the upload command is run, but we hold on to <frame> much longer than that
437 // (in fact, all the way until we no longer use the texture in rendering).
438 auto upload_func = [field, video_format, y_offset, cbcr_offset, cbcr_width, userdata]() {
439 unsigned field_start_line = (field == 1) ? video_format.second_field_start : video_format.extra_lines_top + field * (video_format.height + 22);
441 if (userdata->tex_y[field] == 0 ||
442 userdata->tex_cbcr[field] == 0 ||
443 video_format.width != userdata->last_width[field] ||
444 video_format.height != userdata->last_height[field]) {
445 // We changed resolution since last use of this texture, so we need to create
446 // a new object. Note that this each card has its own PBOFrameAllocator,
447 // we don't need to worry about these flip-flopping between resolutions.
448 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
450 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, video_format.height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
452 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
454 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, video_format.width, video_format.height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
456 userdata->last_width[field] = video_format.width;
457 userdata->last_height[field] = video_format.height;
460 GLuint pbo = userdata->pbo;
462 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
465 size_t field_y_start = y_offset + video_format.width * field_start_line;
466 size_t field_cbcr_start = cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t);
468 if (global_flags.flush_pbos) {
469 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_y_start, video_format.width * video_format.height);
471 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, field_cbcr_start, cbcr_width * video_format.height * sizeof(uint16_t));
475 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
477 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, video_format.height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_cbcr_start));
479 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
481 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, video_format.width, video_format.height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(field_y_start));
483 glBindTexture(GL_TEXTURE_2D, 0);
485 glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
490 // Don't upload the second field as fast as we can; wait until
491 // the field time has approximately passed. (Otherwise, we could
492 // get timing jitter against the other sources, and possibly also
493 // against the video display, although the latter is not as critical.)
494 // This requires our system clock to be reasonably close to the
495 // video clock, but that's not an unreasonable assumption.
496 steady_clock::time_point second_field_start = frame_upload_start +
497 nanoseconds(frame_length * 1000000000 / TIMEBASE);
498 this_thread::sleep_until(second_field_start);
502 unique_lock<mutex> lock(bmusb_mutex);
503 CaptureCard::NewFrame new_frame;
504 new_frame.frame = frame;
505 new_frame.length = frame_length;
506 new_frame.field = field;
507 new_frame.interlaced = video_format.interlaced;
508 new_frame.upload_func = upload_func;
509 new_frame.dropped_frames = dropped_frames;
510 card->new_frames.push(move(new_frame));
511 card->new_frames_changed.notify_all();
516 void Mixer::bm_hotplug_add(libusb_device *dev)
518 lock_guard<mutex> lock(hotplug_mutex);
519 hotplugged_cards.push_back(dev);
522 void Mixer::bm_hotplug_remove(unsigned card_index)
524 cards[card_index].new_frames_changed.notify_all();
527 void Mixer::thread_func()
529 eglBindAPI(EGL_OPENGL_API);
530 QOpenGLContext *context = create_context(mixer_surface);
531 if (!make_current(context, mixer_surface)) {
536 steady_clock::time_point start, now;
537 start = steady_clock::now();
540 int stats_dropped_frames = 0;
542 while (!should_quit) {
543 CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS];
544 bool has_new_frame[MAX_VIDEO_CARDS] = { false };
545 int num_samples[MAX_VIDEO_CARDS] = { 0 };
547 unsigned master_card_index = theme->map_signal(master_clock_channel);
548 assert(master_card_index < num_cards);
550 get_one_frame_from_each_card(master_card_index, new_frames, has_new_frame, num_samples);
551 schedule_audio_resampling_tasks(new_frames[master_card_index].dropped_frames, num_samples[master_card_index], new_frames[master_card_index].length);
552 stats_dropped_frames += new_frames[master_card_index].dropped_frames;
554 handle_hotplugged_cards();
556 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
557 if (card_index == master_card_index || !has_new_frame[card_index]) {
560 if (new_frames[card_index].frame->len == 0) {
561 ++new_frames[card_index].dropped_frames;
563 if (new_frames[card_index].dropped_frames > 0) {
564 printf("Card %u dropped %d frames before this\n",
565 card_index, int(new_frames[card_index].dropped_frames));
569 // If the first card is reporting a corrupted or otherwise dropped frame,
570 // just increase the pts (skipping over this frame) and don't try to compute anything new.
571 if (new_frames[master_card_index].frame->len == 0) {
572 ++stats_dropped_frames;
573 pts_int += new_frames[master_card_index].length;
577 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
578 if (!has_new_frame[card_index] || new_frames[card_index].frame->len == 0)
581 CaptureCard::NewFrame *new_frame = &new_frames[card_index];
582 assert(new_frame->frame != nullptr);
583 insert_new_frame(new_frame->frame, new_frame->field, new_frame->interlaced, card_index, &input_state);
586 // The new texture might need uploading before use.
587 if (new_frame->upload_func) {
588 new_frame->upload_func();
589 new_frame->upload_func = nullptr;
593 int64_t frame_duration = new_frames[master_card_index].length;
594 render_one_frame(frame_duration);
596 pts_int += frame_duration;
598 now = steady_clock::now();
599 double elapsed = duration<double>(now - start).count();
600 if (frame % 100 == 0) {
601 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)",
602 frame, stats_dropped_frames, elapsed, frame / elapsed,
603 1e3 * elapsed / frame);
604 // chain->print_phase_timing();
606 // Check our memory usage, to see if we are close to our mlockall()
607 // limit (if at all set).
609 if (getrusage(RUSAGE_SELF, &used) == -1) {
610 perror("getrusage(RUSAGE_SELF)");
616 if (getrlimit(RLIMIT_MEMLOCK, &limit) == -1) {
617 perror("getrlimit(RLIMIT_MEMLOCK)");
621 printf(", using %ld / %ld MB lockable memory (%.1f%%)",
622 long(used.ru_maxrss / 1024),
623 long(limit.rlim_cur / 1048576),
624 float(100.0 * (used.ru_maxrss * 1024.0) / limit.rlim_cur));
626 printf(", using %ld MB memory (not locked)",
627 long(used.ru_maxrss / 1024));
634 if (should_cut.exchange(false)) { // Test and clear.
635 video_encoder->do_cut(frame);
639 // Reset every 100 frames, so that local variations in frame times
640 // (especially for the first few frames, when the shaders are
641 // compiled etc.) don't make it hard to measure for the entire
642 // remaining duration of the program.
643 if (frame == 10000) {
651 resource_pool->clean_context();
654 void Mixer::get_one_frame_from_each_card(unsigned master_card_index, CaptureCard::NewFrame new_frames[MAX_VIDEO_CARDS], bool has_new_frame[MAX_VIDEO_CARDS], int num_samples[MAX_VIDEO_CARDS])
657 // The first card is the master timer, so wait for it to have a new frame.
658 // TODO: Add a timeout.
659 unique_lock<mutex> lock(bmusb_mutex);
660 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(); });
662 if (cards[master_card_index].new_frames.empty()) {
663 // We were woken up, but not due to a new frame. Deal with it
665 assert(cards[master_card_index].capture->get_disconnected());
666 handle_hotplugged_cards();
670 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
671 CaptureCard *card = &cards[card_index];
672 if (card->new_frames.empty()) {
673 assert(card_index != master_card_index);
674 card->queue_length_policy.update_policy(-1);
677 new_frames[card_index] = move(card->new_frames.front());
678 has_new_frame[card_index] = true;
679 card->new_frames.pop();
680 card->new_frames_changed.notify_all();
682 int num_samples_times_timebase = OUTPUT_FREQUENCY * new_frames[card_index].length + card->fractional_samples;
683 num_samples[card_index] = num_samples_times_timebase / TIMEBASE;
684 card->fractional_samples = num_samples_times_timebase % TIMEBASE;
685 assert(num_samples[card_index] >= 0);
687 if (card_index == master_card_index) {
688 // We don't use the queue length policy for the master card,
689 // but we will if it stops being the master. Thus, clear out
690 // the policy in case we switch in the future.
691 card->queue_length_policy.reset(card_index);
693 // If we have excess frames compared to the policy for this card,
694 // drop frames from the head.
695 card->queue_length_policy.update_policy(card->new_frames.size());
696 while (card->new_frames.size() > card->queue_length_policy.get_safe_queue_length()) {
697 card->new_frames.pop();
703 void Mixer::handle_hotplugged_cards()
705 // Check for cards that have been disconnected since last frame.
706 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
707 CaptureCard *card = &cards[card_index];
708 if (card->capture->get_disconnected()) {
709 fprintf(stderr, "Card %u went away, replacing with a fake card.\n", card_index);
710 FakeCapture *capture = new FakeCapture(WIDTH, HEIGHT, FAKE_FPS, OUTPUT_FREQUENCY, card_index, global_flags.fake_cards_audio);
711 configure_card(card_index, capture, /*is_fake_capture=*/true);
712 card->queue_length_policy.reset(card_index);
713 card->capture->start_bm_capture();
717 // Check for cards that have been connected since last frame.
718 vector<libusb_device *> hotplugged_cards_copy;
720 lock_guard<mutex> lock(hotplug_mutex);
721 swap(hotplugged_cards, hotplugged_cards_copy);
723 for (libusb_device *new_dev : hotplugged_cards_copy) {
724 // Look for a fake capture card where we can stick this in.
725 int free_card_index = -1;
726 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
727 if (cards[card_index].is_fake_capture) {
728 free_card_index = int(card_index);
733 if (free_card_index == -1) {
734 fprintf(stderr, "New card plugged in, but no free slots -- ignoring.\n");
735 libusb_unref_device(new_dev);
737 // BMUSBCapture takes ownership.
738 fprintf(stderr, "New card plugged in, choosing slot %d.\n", free_card_index);
739 CaptureCard *card = &cards[free_card_index];
740 BMUSBCapture *capture = new BMUSBCapture(free_card_index, new_dev);
741 configure_card(free_card_index, capture, /*is_fake_capture=*/false);
742 card->queue_length_policy.reset(free_card_index);
743 capture->set_card_disconnected_callback(bind(&Mixer::bm_hotplug_remove, this, free_card_index));
744 capture->start_bm_capture();
750 void Mixer::schedule_audio_resampling_tasks(unsigned dropped_frames, int num_samples_per_frame, int length_per_frame)
752 // Resample the audio as needed, including from previously dropped frames.
753 assert(num_cards > 0);
754 for (unsigned frame_num = 0; frame_num < dropped_frames + 1; ++frame_num) {
755 const bool dropped_frame = (frame_num != dropped_frames);
757 // Signal to the audio thread to process this frame.
758 // Note that if the frame is a dropped frame, we signal that
759 // we don't want to use this frame as base for adjusting
760 // the resampler rate. The reason for this is that the timing
761 // of these frames is often way too late; they typically don't
762 // “arrive” before we synthesize them. Thus, we could end up
763 // in a situation where we have inserted e.g. five audio frames
764 // into the queue before we then start pulling five of them
765 // back out. This makes ResamplingQueue overestimate the delay,
766 // causing undue resampler changes. (We _do_ use the last,
767 // non-dropped frame; perhaps we should just discard that as well,
768 // since dropped frames are expected to be rare, and it might be
769 // better to just wait until we have a slightly more normal situation).
770 unique_lock<mutex> lock(audio_mutex);
771 bool adjust_rate = !dropped_frame;
772 audio_task_queue.push(AudioTask{pts_int, num_samples_per_frame, adjust_rate});
773 audio_task_queue_changed.notify_one();
776 // For dropped frames, increase the pts. Note that if the format changed
777 // in the meantime, we have no way of detecting that; we just have to
778 // assume the frame length is always the same.
779 pts_int += length_per_frame;
784 void Mixer::render_one_frame(int64_t duration)
786 // Get the main chain from the theme, and set its state immediately.
787 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT, input_state);
788 EffectChain *chain = theme_main_chain.chain;
789 theme_main_chain.setup_chain();
790 //theme_main_chain.chain->enable_phase_timing(true);
792 GLuint y_tex, cbcr_tex;
793 bool got_frame = video_encoder->begin_frame(&y_tex, &cbcr_tex);
796 // Render main chain.
797 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
798 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
799 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
801 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
802 resource_pool->release_fbo(fbo);
804 subsample_chroma(cbcr_full_tex, cbcr_tex);
805 resource_pool->release_2d_texture(cbcr_full_tex);
807 // Set the right state for rgba_tex.
808 glBindFramebuffer(GL_FRAMEBUFFER, 0);
809 glBindTexture(GL_TEXTURE_2D, rgba_tex);
810 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
811 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
812 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
814 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
815 RefCountedGLsync fence = video_encoder->end_frame(pts_int + av_delay, duration, theme_main_chain.input_frames);
817 // The live frame just shows the RGBA texture we just rendered.
818 // It owns rgba_tex now.
819 DisplayFrame live_frame;
820 live_frame.chain = display_chain.get();
821 live_frame.setup_chain = [this, rgba_tex]{
822 display_input->set_texture_num(rgba_tex);
824 live_frame.ready_fence = fence;
825 live_frame.input_frames = {};
826 live_frame.temp_textures = { rgba_tex };
827 output_channel[OUTPUT_LIVE].output_frame(live_frame);
829 // Set up preview and any additional channels.
830 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
831 DisplayFrame display_frame;
832 Theme::Chain chain = theme->get_chain(i, pts(), WIDTH, HEIGHT, input_state); // FIXME: dimensions
833 display_frame.chain = chain.chain;
834 display_frame.setup_chain = chain.setup_chain;
835 display_frame.ready_fence = fence;
836 display_frame.input_frames = chain.input_frames;
837 display_frame.temp_textures = {};
838 output_channel[i].output_frame(display_frame);
842 void Mixer::audio_thread_func()
844 while (!should_quit) {
848 unique_lock<mutex> lock(audio_mutex);
849 audio_task_queue_changed.wait(lock, [this]{ return should_quit || !audio_task_queue.empty(); });
853 task = audio_task_queue.front();
854 audio_task_queue.pop();
857 ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy =
858 task.adjust_rate ? ResamplingQueue::ADJUST_RATE : ResamplingQueue::DO_NOT_ADJUST_RATE;
859 vector<float> samples_out = audio_mixer.get_output(double(task.pts_int) / TIMEBASE, task.num_samples, rate_adjustment_policy);
861 // Send the samples to the sound card, then add them to the output.
863 alsa->write(samples_out);
865 video_encoder->add_audio(task.pts_int, move(samples_out));
869 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
872 glGenVertexArrays(1, &vao);
875 glBindVertexArray(vao);
879 GLuint fbo = resource_pool->create_fbo(dst_tex);
880 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
881 glViewport(0, 0, WIDTH/2, HEIGHT/2);
884 glUseProgram(cbcr_program_num);
887 glActiveTexture(GL_TEXTURE0);
889 glBindTexture(GL_TEXTURE_2D, src_tex);
891 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
893 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
895 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
898 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
899 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
901 glBindBuffer(GL_ARRAY_BUFFER, cbcr_vbo);
904 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
905 glEnableVertexAttribArray(attr_index);
907 glVertexAttribPointer(attr_index, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
911 glDrawArrays(GL_TRIANGLES, 0, 3);
914 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
915 glDisableVertexAttribArray(attr_index);
921 glBindFramebuffer(GL_FRAMEBUFFER, 0);
924 resource_pool->release_fbo(fbo);
925 glDeleteVertexArrays(1, &vao);
928 void Mixer::release_display_frame(DisplayFrame *frame)
930 for (GLuint texnum : frame->temp_textures) {
931 resource_pool->release_2d_texture(texnum);
933 frame->temp_textures.clear();
934 frame->ready_fence.reset();
935 frame->input_frames.clear();
940 mixer_thread = thread(&Mixer::thread_func, this);
941 audio_thread = thread(&Mixer::audio_thread_func, this);
947 audio_task_queue_changed.notify_one();
952 void Mixer::transition_clicked(int transition_num)
954 theme->transition_clicked(transition_num, pts());
957 void Mixer::channel_clicked(int preview_num)
959 theme->channel_clicked(preview_num);
962 void Mixer::start_mode_scanning(unsigned card_index)
964 assert(card_index < num_cards);
965 if (is_mode_scanning[card_index]) {
968 is_mode_scanning[card_index] = true;
969 mode_scanlist[card_index].clear();
970 for (const auto &mode : cards[card_index].capture->get_available_video_modes()) {
971 mode_scanlist[card_index].push_back(mode.first);
973 assert(!mode_scanlist[card_index].empty());
974 mode_scanlist_index[card_index] = 0;
975 cards[card_index].capture->set_video_mode(mode_scanlist[card_index][0]);
976 last_mode_scan_change[card_index] = steady_clock::now();
979 Mixer::OutputChannel::~OutputChannel()
981 if (has_current_frame) {
982 parent->release_display_frame(¤t_frame);
984 if (has_ready_frame) {
985 parent->release_display_frame(&ready_frame);
989 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
991 // Store this frame for display. Remove the ready frame if any
992 // (it was seemingly never used).
994 unique_lock<mutex> lock(frame_mutex);
995 if (has_ready_frame) {
996 parent->release_display_frame(&ready_frame);
999 has_ready_frame = true;
1002 if (new_frame_ready_callback) {
1003 new_frame_ready_callback();
1006 // Reduce the number of callbacks by filtering duplicates. The reason
1007 // why we bother doing this is that Qt seemingly can get into a state
1008 // where its builds up an essentially unbounded queue of signals,
1009 // consuming more and more memory, and there's no good way of collapsing
1010 // user-defined signals or limiting the length of the queue.
1011 if (transition_names_updated_callback) {
1012 vector<string> transition_names = global_mixer->get_transition_names();
1013 bool changed = false;
1014 if (transition_names.size() != last_transition_names.size()) {
1017 for (unsigned i = 0; i < transition_names.size(); ++i) {
1018 if (transition_names[i] != last_transition_names[i]) {
1025 transition_names_updated_callback(transition_names);
1026 last_transition_names = transition_names;
1029 if (name_updated_callback) {
1030 string name = global_mixer->get_channel_name(channel);
1031 if (name != last_name) {
1032 name_updated_callback(name);
1036 if (color_updated_callback) {
1037 string color = global_mixer->get_channel_color(channel);
1038 if (color != last_color) {
1039 color_updated_callback(color);
1045 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1047 unique_lock<mutex> lock(frame_mutex);
1048 if (!has_current_frame && !has_ready_frame) {
1052 if (has_current_frame && has_ready_frame) {
1053 // We have a new ready frame. Toss the current one.
1054 parent->release_display_frame(¤t_frame);
1055 has_current_frame = false;
1057 if (has_ready_frame) {
1058 assert(!has_current_frame);
1059 current_frame = ready_frame;
1060 ready_frame.ready_fence.reset(); // Drop the refcount.
1061 ready_frame.input_frames.clear(); // Drop the refcounts.
1062 has_current_frame = true;
1063 has_ready_frame = false;
1066 *frame = current_frame;
1070 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1072 new_frame_ready_callback = callback;
1075 void Mixer::OutputChannel::set_transition_names_updated_callback(Mixer::transition_names_updated_callback_t callback)
1077 transition_names_updated_callback = callback;
1080 void Mixer::OutputChannel::set_name_updated_callback(Mixer::name_updated_callback_t callback)
1082 name_updated_callback = callback;
1085 void Mixer::OutputChannel::set_color_updated_callback(Mixer::color_updated_callback_t callback)
1087 color_updated_callback = callback;
1090 mutex RefCountedGLsync::fence_lock;