7 #include <movit/effect_chain.h>
8 #include <movit/effect_util.h>
9 #include <movit/flat_input.h>
10 #include <movit/image_format.h>
11 #include <movit/init.h>
12 #include <movit/resource_pool.h>
13 #include <movit/util.h>
21 #include <condition_variable>
29 #include <arpa/inet.h>
31 #include "bmusb/bmusb.h"
33 #include "decklink_capture.h"
36 #include "h264encode.h"
37 #include "pbo_frame_allocator.h"
38 #include "ref_counted_gl_sync.h"
43 using namespace movit;
45 using namespace std::placeholders;
47 Mixer *global_mixer = nullptr;
51 void convert_fixed24_to_fp32(float *dst, size_t out_channels, const uint8_t *src, size_t in_channels, size_t num_samples)
53 for (size_t i = 0; i < num_samples; ++i) {
54 for (size_t j = 0; j < out_channels; ++j) {
58 uint32_t s = s1 | (s1 << 8) | (s2 << 16) | (s3 << 24);
59 dst[i * out_channels + j] = int(s) * (1.0f / 4294967296.0f);
61 src += 3 * (in_channels - out_channels);
65 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
68 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
69 input_state->buffered_frames[card_index][frame_num] =
70 input_state->buffered_frames[card_index][frame_num - 1];
72 input_state->buffered_frames[card_index][0] = { frame, field_num };
74 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
75 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
80 string generate_local_dump_filename(int frame)
82 time_t now = time(NULL);
84 localtime_r(&now, &now_tm);
87 strftime(timestamp, sizeof(timestamp), "%F-%T%z", &now_tm);
89 // Use the frame number to disambiguate between two cuts starting
90 // on the same second.
92 snprintf(filename, sizeof(filename), "%s%s-f%02d%s",
93 LOCAL_DUMP_PREFIX, timestamp, frame % 100, LOCAL_DUMP_SUFFIX);
99 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
100 : httpd(WIDTH, HEIGHT),
101 num_cards(num_cards),
102 mixer_surface(create_surface(format)),
103 h264_encoder_surface(create_surface(format)),
104 correlation(OUTPUT_FREQUENCY),
105 level_compressor(OUTPUT_FREQUENCY),
106 limiter(OUTPUT_FREQUENCY),
107 compressor(OUTPUT_FREQUENCY)
109 httpd.open_output_file(generate_local_dump_filename(/*frame=*/0).c_str());
112 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
115 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
116 // will be halved when sampling them, and we need to compensate here.
117 movit_texel_subpixel_precision /= 2.0;
119 resource_pool.reset(new ResourcePool);
120 theme.reset(new Theme("theme.lua", resource_pool.get(), num_cards));
121 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
122 output_channel[i].parent = this;
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 h264_encoder.reset(new H264Encoder(h264_encoder_surface, global_flags.va_display, WIDTH, HEIGHT, &httpd));
140 // First try initializing the PCI devices, then USB, until we have the desired number of cards.
141 unsigned num_pci_devices = 0, num_usb_devices = 0;
142 unsigned card_index = 0;
144 IDeckLinkIterator *decklink_iterator = CreateDeckLinkIteratorInstance();
145 if (decklink_iterator != nullptr) {
146 for ( ; card_index < num_cards; ++card_index) {
148 if (decklink_iterator->Next(&decklink) != S_OK) {
152 configure_card(card_index, format, new DeckLinkCapture(decklink, card_index));
155 decklink_iterator->Release();
156 fprintf(stderr, "Found %d DeckLink PCI card(s).\n", num_pci_devices);
158 fprintf(stderr, "DeckLink drivers not found. Probing for USB cards only.\n");
160 for ( ; card_index < num_cards; ++card_index) {
161 configure_card(card_index, format, new BMUSBCapture(card_index - num_pci_devices));
165 if (num_usb_devices > 0) {
166 BMUSBCapture::start_bm_thread();
169 for (card_index = 0; card_index < num_cards; ++card_index) {
170 cards[card_index].capture->start_bm_capture();
173 // Set up stuff for NV12 conversion.
176 string cbcr_vert_shader =
179 "in vec2 position; \n"
180 "in vec2 texcoord; \n"
182 "uniform vec2 foo_chroma_offset_0; \n"
186 " // The result of glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0) is: \n"
188 " // 2.000 0.000 0.000 -1.000 \n"
189 " // 0.000 2.000 0.000 -1.000 \n"
190 " // 0.000 0.000 -2.000 -1.000 \n"
191 " // 0.000 0.000 0.000 1.000 \n"
192 " gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0); \n"
193 " vec2 flipped_tc = texcoord; \n"
194 " tc0 = flipped_tc + foo_chroma_offset_0; \n"
196 string cbcr_frag_shader =
199 "uniform sampler2D cbcr_tex; \n"
200 "out vec4 FragColor; \n"
202 " FragColor = texture(cbcr_tex, tc0); \n"
204 vector<string> frag_shader_outputs;
205 cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader, frag_shader_outputs);
212 cbcr_vbo = generate_vbo(2, GL_FLOAT, sizeof(vertices), vertices);
213 cbcr_position_attribute_index = glGetAttribLocation(cbcr_program_num, "position");
214 cbcr_texcoord_attribute_index = glGetAttribLocation(cbcr_program_num, "texcoord");
216 r128.init(2, OUTPUT_FREQUENCY);
219 locut.init(FILTER_HPF, 2);
221 // hlen=16 is pretty low quality, but we use quite a bit of CPU otherwise,
222 // and there's a limit to how important the peak meter is.
223 peak_resampler.setup(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY * 4, /*num_channels=*/2, /*hlen=*/16, /*frel=*/1.0);
225 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
230 resource_pool->release_glsl_program(cbcr_program_num);
231 glDeleteBuffers(1, &cbcr_vbo);
232 BMUSBCapture::stop_bm_thread();
234 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
236 unique_lock<mutex> lock(bmusb_mutex);
237 cards[card_index].should_quit = true; // Unblock thread.
238 cards[card_index].new_data_ready_changed.notify_all();
240 cards[card_index].capture->stop_dequeue_thread();
243 h264_encoder.reset(nullptr);
246 void Mixer::configure_card(unsigned card_index, const QSurfaceFormat &format, CaptureInterface *capture)
248 printf("Configuring card %d...\n", card_index);
250 CaptureCard *card = &cards[card_index];
251 card->capture = capture;
252 card->capture->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
253 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, WIDTH, HEIGHT)); // 8 MB.
254 card->capture->set_video_frame_allocator(card->frame_allocator.get());
255 card->surface = create_surface(format);
256 card->capture->set_dequeue_thread_callbacks(
258 eglBindAPI(EGL_OPENGL_API);
259 card->context = create_context(card->surface);
260 if (!make_current(card->context, card->surface)) {
261 printf("failed to create bmusb context\n");
266 resource_pool->clean_context();
268 card->resampling_queue.reset(new ResamplingQueue(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
269 card->capture->configure_card();
275 int unwrap_timecode(uint16_t current_wrapped, int last)
277 uint16_t last_wrapped = last & 0xffff;
278 if (current_wrapped > last_wrapped) {
279 return (last & ~0xffff) | current_wrapped;
281 return 0x10000 + ((last & ~0xffff) | current_wrapped);
285 float find_peak(const float *samples, size_t num_samples)
287 float m = fabs(samples[0]);
288 for (size_t i = 1; i < num_samples; ++i) {
289 m = max(m, fabs(samples[i]));
294 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
296 size_t num_samples = in.size() / 2;
297 out_l->resize(num_samples);
298 out_r->resize(num_samples);
300 const float *inptr = in.data();
301 float *lptr = &(*out_l)[0];
302 float *rptr = &(*out_r)[0];
303 for (size_t i = 0; i < num_samples; ++i) {
311 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
312 FrameAllocator::Frame video_frame, size_t video_offset, VideoFormat video_format,
313 FrameAllocator::Frame audio_frame, size_t audio_offset, AudioFormat audio_format)
315 CaptureCard *card = &cards[card_index];
317 int64_t frame_length = int64_t(TIMEBASE * video_format.frame_rate_den) / video_format.frame_rate_nom;
319 size_t num_samples = (audio_frame.len >= audio_offset) ? (audio_frame.len - audio_offset) / 8 / 3 : 0;
320 if (num_samples > OUTPUT_FREQUENCY / 10) {
321 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",
322 card_index, int(audio_frame.len), int(audio_offset),
323 timecode, int(video_frame.len), int(video_offset), video_format.id);
324 if (video_frame.owner) {
325 video_frame.owner->release_frame(video_frame);
327 if (audio_frame.owner) {
328 audio_frame.owner->release_frame(audio_frame);
333 int64_t local_pts = card->next_local_pts;
334 int dropped_frames = 0;
335 if (card->last_timecode != -1) {
336 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
339 // Convert the audio to stereo fp32 and add it.
341 audio.resize(num_samples * 2);
342 switch (audio_format.bits_per_sample) {
344 convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, audio_format.num_channels, num_samples);
347 fprintf(stderr, "Cannot handle audio with %u bits per sample\n", audio_format.bits_per_sample);
353 unique_lock<mutex> lock(card->audio_mutex);
355 // Number of samples per frame if we need to insert silence.
356 // (Could be nonintegral, but resampling will save us then.)
357 int silence_samples = OUTPUT_FREQUENCY * video_format.frame_rate_den / video_format.frame_rate_nom;
359 if (dropped_frames > MAX_FPS * 2) {
360 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
361 card_index, card->last_timecode, timecode);
362 card->resampling_queue.reset(new ResamplingQueue(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
364 } else if (dropped_frames > 0) {
365 // Insert silence as needed.
366 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
367 card_index, dropped_frames, timecode);
368 vector<float> silence(silence_samples * 2, 0.0f);
369 for (int i = 0; i < dropped_frames; ++i) {
370 card->resampling_queue->add_input_samples(local_pts / double(TIMEBASE), silence.data(), silence_samples);
371 // Note that if the format changed in the meantime, we have
372 // no way of detecting that; we just have to assume the frame length
373 // is always the same.
374 local_pts += frame_length;
377 if (num_samples == 0) {
378 audio.resize(silence_samples * 2);
379 num_samples = silence_samples;
381 card->resampling_queue->add_input_samples(local_pts / double(TIMEBASE), audio.data(), num_samples);
382 card->next_local_pts = local_pts + frame_length;
385 card->last_timecode = timecode;
387 // Done with the audio, so release it.
388 if (audio_frame.owner) {
389 audio_frame.owner->release_frame(audio_frame);
393 // Wait until the previous frame was consumed.
394 unique_lock<mutex> lock(bmusb_mutex);
395 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
396 if (card->should_quit) return;
399 size_t expected_length = video_format.width * (video_format.height + video_format.extra_lines_top + video_format.extra_lines_bottom) * 2;
400 if (video_frame.len - video_offset == 0 ||
401 video_frame.len - video_offset != expected_length) {
402 if (video_frame.len != 0) {
403 printf("Card %d: Dropping video frame with wrong length (%ld; expected %ld)\n",
404 card_index, video_frame.len - video_offset, expected_length);
406 if (video_frame.owner) {
407 video_frame.owner->release_frame(video_frame);
410 // Still send on the information that we _had_ a frame, even though it's corrupted,
411 // so that pts can go up accordingly.
413 unique_lock<mutex> lock(bmusb_mutex);
414 card->new_data_ready = true;
415 card->new_frame = RefCountedFrame(FrameAllocator::Frame());
416 card->new_frame_length = frame_length;
417 card->new_frame_interlaced = false;
418 card->new_data_ready_fence = nullptr;
419 card->dropped_frames = dropped_frames;
420 card->new_data_ready_changed.notify_all();
425 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
427 unsigned num_fields = video_format.interlaced ? 2 : 1;
428 timespec frame_upload_start;
429 if (video_format.interlaced) {
430 // Send the two fields along as separate frames; the other side will need to add
431 // a deinterlacer to actually get this right.
432 assert(video_format.height % 2 == 0);
433 video_format.height /= 2;
434 assert(frame_length % 2 == 0);
437 clock_gettime(CLOCK_MONOTONIC, &frame_upload_start);
439 userdata->last_interlaced = video_format.interlaced;
440 userdata->last_has_signal = video_format.has_signal;
441 userdata->last_frame_rate_nom = video_format.frame_rate_nom;
442 userdata->last_frame_rate_den = video_format.frame_rate_den;
443 RefCountedFrame new_frame(video_frame);
445 // Upload the textures.
446 size_t cbcr_width = video_format.width / 2;
447 size_t cbcr_offset = video_offset / 2;
448 size_t y_offset = video_frame.size / 2 + video_offset / 2;
450 for (unsigned field = 0; field < num_fields; ++field) {
451 unsigned field_start_line = (field == 1) ? video_format.second_field_start : video_format.extra_lines_top + field * (video_format.height + 22);
453 if (userdata->tex_y[field] == 0 ||
454 userdata->tex_cbcr[field] == 0 ||
455 video_format.width != userdata->last_width[field] ||
456 video_format.height != userdata->last_height[field]) {
457 // We changed resolution since last use of this texture, so we need to create
458 // a new object. Note that this each card has its own PBOFrameAllocator,
459 // we don't need to worry about these flip-flopping between resolutions.
460 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
462 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, video_format.height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
464 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
466 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, video_format.width, video_format.height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
468 userdata->last_width[field] = video_format.width;
469 userdata->last_height[field] = video_format.height;
472 GLuint pbo = userdata->pbo;
474 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
476 glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
479 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
481 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, video_format.height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t)));
483 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
485 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, video_format.width, video_format.height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(y_offset + video_format.width * field_start_line));
487 glBindTexture(GL_TEXTURE_2D, 0);
489 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
491 GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
493 assert(fence != nullptr);
496 // Don't upload the second field as fast as we can; wait until
497 // the field time has approximately passed. (Otherwise, we could
498 // get timing jitter against the other sources, and possibly also
499 // against the video display, although the latter is not as critical.)
500 // This requires our system clock to be reasonably close to the
501 // video clock, but that's not an unreasonable assumption.
502 timespec second_field_start;
503 second_field_start.tv_nsec = frame_upload_start.tv_nsec +
504 frame_length * 1000000000 / TIMEBASE;
505 second_field_start.tv_sec = frame_upload_start.tv_sec +
506 second_field_start.tv_nsec / 1000000000;
507 second_field_start.tv_nsec %= 1000000000;
509 while (clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME,
510 &second_field_start, nullptr) == -1 &&
515 unique_lock<mutex> lock(bmusb_mutex);
516 card->new_data_ready = true;
517 card->new_frame = new_frame;
518 card->new_frame_length = frame_length;
519 card->new_frame_field = field;
520 card->new_frame_interlaced = video_format.interlaced;
521 card->new_data_ready_fence = fence;
522 card->dropped_frames = dropped_frames;
523 card->new_data_ready_changed.notify_all();
525 if (field != num_fields - 1) {
526 // Wait until the previous frame was consumed.
527 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
528 if (card->should_quit) return;
534 void Mixer::thread_func()
536 eglBindAPI(EGL_OPENGL_API);
537 QOpenGLContext *context = create_context(mixer_surface);
538 if (!make_current(context, mixer_surface)) {
543 struct timespec start, now;
544 clock_gettime(CLOCK_MONOTONIC, &start);
547 int stats_dropped_frames = 0;
549 while (!should_quit) {
550 CaptureCard card_copy[MAX_CARDS];
551 int num_samples[MAX_CARDS];
554 unique_lock<mutex> lock(bmusb_mutex);
556 // The first card is the master timer, so wait for it to have a new frame.
557 // TODO: Make configurable, and with a timeout.
558 cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
560 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
561 CaptureCard *card = &cards[card_index];
562 card_copy[card_index].new_data_ready = card->new_data_ready;
563 card_copy[card_index].new_frame = card->new_frame;
564 card_copy[card_index].new_frame_length = card->new_frame_length;
565 card_copy[card_index].new_frame_field = card->new_frame_field;
566 card_copy[card_index].new_frame_interlaced = card->new_frame_interlaced;
567 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
568 card_copy[card_index].dropped_frames = card->dropped_frames;
569 card->new_data_ready = false;
570 card->new_data_ready_changed.notify_all();
572 int num_samples_times_timebase = OUTPUT_FREQUENCY * card->new_frame_length + card->fractional_samples;
573 num_samples[card_index] = num_samples_times_timebase / TIMEBASE;
574 card->fractional_samples = num_samples_times_timebase % TIMEBASE;
575 assert(num_samples[card_index] >= 0);
579 // Resample the audio as needed, including from previously dropped frames.
580 assert(num_cards > 0);
581 for (unsigned frame_num = 0; frame_num < card_copy[0].dropped_frames + 1; ++frame_num) {
583 // Signal to the audio thread to process this frame.
584 unique_lock<mutex> lock(audio_mutex);
585 audio_task_queue.push(AudioTask{pts_int, num_samples[0]});
586 audio_task_queue_changed.notify_one();
588 if (frame_num != card_copy[0].dropped_frames) {
589 // For dropped frames, increase the pts. Note that if the format changed
590 // in the meantime, we have no way of detecting that; we just have to
591 // assume the frame length is always the same.
592 ++stats_dropped_frames;
593 pts_int += card_copy[0].new_frame_length;
597 if (audio_level_callback != nullptr) {
598 unique_lock<mutex> lock(compressor_mutex);
599 double loudness_s = r128.loudness_S();
600 double loudness_i = r128.integrated();
601 double loudness_range_low = r128.range_min();
602 double loudness_range_high = r128.range_max();
604 audio_level_callback(loudness_s, 20.0 * log10(peak),
605 loudness_i, loudness_range_low, loudness_range_high,
606 gain_staging_db, 20.0 * log10(final_makeup_gain),
607 correlation.get_correlation());
610 for (unsigned card_index = 1; card_index < num_cards; ++card_index) {
611 if (card_copy[card_index].new_data_ready && card_copy[card_index].new_frame->len == 0) {
612 ++card_copy[card_index].dropped_frames;
614 if (card_copy[card_index].dropped_frames > 0) {
615 printf("Card %u dropped %d frames before this\n",
616 card_index, int(card_copy[card_index].dropped_frames));
620 // If the first card is reporting a corrupted or otherwise dropped frame,
621 // just increase the pts (skipping over this frame) and don't try to compute anything new.
622 if (card_copy[0].new_frame->len == 0) {
623 ++stats_dropped_frames;
624 pts_int += card_copy[0].new_frame_length;
628 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
629 CaptureCard *card = &card_copy[card_index];
630 if (!card->new_data_ready || card->new_frame->len == 0)
633 assert(card->new_frame != nullptr);
634 insert_new_frame(card->new_frame, card->new_frame_field, card->new_frame_interlaced, card_index, &input_state);
637 // The new texture might still be uploaded,
638 // tell the GPU to wait until it's there.
639 if (card->new_data_ready_fence) {
640 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
642 glDeleteSync(card->new_data_ready_fence);
647 // Get the main chain from the theme, and set its state immediately.
648 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT, input_state);
649 EffectChain *chain = theme_main_chain.chain;
650 theme_main_chain.setup_chain();
651 //theme_main_chain.chain->enable_phase_timing(true);
653 GLuint y_tex, cbcr_tex;
654 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
657 // Render main chain.
658 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
659 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
660 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
662 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
663 resource_pool->release_fbo(fbo);
665 subsample_chroma(cbcr_full_tex, cbcr_tex);
666 resource_pool->release_2d_texture(cbcr_full_tex);
668 // Set the right state for rgba_tex.
669 glBindFramebuffer(GL_FRAMEBUFFER, 0);
670 glBindTexture(GL_TEXTURE_2D, rgba_tex);
671 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
672 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
673 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
675 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
678 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
679 h264_encoder->end_frame(fence, pts_int + av_delay, theme_main_chain.input_frames);
681 pts_int += card_copy[0].new_frame_length;
683 // The live frame just shows the RGBA texture we just rendered.
684 // It owns rgba_tex now.
685 DisplayFrame live_frame;
686 live_frame.chain = display_chain.get();
687 live_frame.setup_chain = [this, rgba_tex]{
688 display_input->set_texture_num(rgba_tex);
690 live_frame.ready_fence = fence;
691 live_frame.input_frames = {};
692 live_frame.temp_textures = { rgba_tex };
693 output_channel[OUTPUT_LIVE].output_frame(live_frame);
695 // Set up preview and any additional channels.
696 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
697 DisplayFrame display_frame;
698 Theme::Chain chain = theme->get_chain(i, pts(), WIDTH, HEIGHT, input_state); // FIXME: dimensions
699 display_frame.chain = chain.chain;
700 display_frame.setup_chain = chain.setup_chain;
701 display_frame.ready_fence = fence;
702 display_frame.input_frames = chain.input_frames;
703 display_frame.temp_textures = {};
704 output_channel[i].output_frame(display_frame);
707 clock_gettime(CLOCK_MONOTONIC, &now);
708 double elapsed = now.tv_sec - start.tv_sec +
709 1e-9 * (now.tv_nsec - start.tv_nsec);
710 if (frame % 100 == 0) {
711 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
712 frame, stats_dropped_frames, elapsed, frame / elapsed,
713 1e3 * elapsed / frame);
714 // chain->print_phase_timing();
717 if (should_cut.exchange(false)) { // Test and clear.
718 string filename = generate_local_dump_filename(frame);
719 printf("Starting new recording: %s\n", filename.c_str());
720 h264_encoder->shutdown();
721 httpd.close_output_file();
722 httpd.open_output_file(filename.c_str());
723 h264_encoder.reset(new H264Encoder(h264_encoder_surface, global_flags.va_display, WIDTH, HEIGHT, &httpd));
727 // Reset every 100 frames, so that local variations in frame times
728 // (especially for the first few frames, when the shaders are
729 // compiled etc.) don't make it hard to measure for the entire
730 // remaining duration of the program.
731 if (frame == 10000) {
739 resource_pool->clean_context();
742 void Mixer::audio_thread_func()
744 while (!should_quit) {
748 unique_lock<mutex> lock(audio_mutex);
749 audio_task_queue_changed.wait(lock, [this]{ return !audio_task_queue.empty(); });
750 task = audio_task_queue.front();
751 audio_task_queue.pop();
754 process_audio_one_frame(task.pts_int, task.num_samples);
758 void Mixer::process_audio_one_frame(int64_t frame_pts_int, int num_samples)
760 vector<float> samples_card;
761 vector<float> samples_out;
763 // TODO: Allow mixing audio from several sources.
764 unsigned selected_audio_card = theme->map_signal(audio_source_channel);
765 assert(selected_audio_card < num_cards);
767 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
768 samples_card.resize(num_samples * 2);
770 unique_lock<mutex> lock(cards[card_index].audio_mutex);
771 if (!cards[card_index].resampling_queue->get_output_samples(double(frame_pts_int) / TIMEBASE, &samples_card[0], num_samples)) {
772 printf("Card %d reported previous underrun.\n", card_index);
775 if (card_index == selected_audio_card) {
776 samples_out = move(samples_card);
780 // Cut away everything under 120 Hz (or whatever the cutoff is);
781 // we don't need it for voice, and it will reduce headroom
782 // and confuse the compressor. (In particular, any hums at 50 or 60 Hz
783 // should be dampened.)
785 locut.render(samples_out.data(), samples_out.size() / 2, locut_cutoff_hz * 2.0 * M_PI / OUTPUT_FREQUENCY, 0.5f);
788 // Apply a level compressor to get the general level right.
789 // Basically, if it's over about -40 dBFS, we squeeze it down to that level
790 // (or more precisely, near it, since we don't use infinite ratio),
791 // then apply a makeup gain to get it to -14 dBFS. -14 dBFS is, of course,
792 // entirely arbitrary, but from practical tests with speech, it seems to
793 // put ut around -23 LUFS, so it's a reasonable starting point for later use.
795 unique_lock<mutex> lock(compressor_mutex);
796 if (level_compressor_enabled) {
797 float threshold = 0.01f; // -40 dBFS.
799 float attack_time = 0.5f;
800 float release_time = 20.0f;
801 float makeup_gain = pow(10.0f, (ref_level_dbfs - (-40.0f)) / 20.0f); // +26 dB.
802 level_compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
803 gain_staging_db = 20.0 * log10(level_compressor.get_attenuation() * makeup_gain);
805 // Just apply the gain we already had.
806 float g = pow(10.0f, gain_staging_db / 20.0f);
807 for (size_t i = 0; i < samples_out.size(); ++i) {
814 printf("level=%f (%+5.2f dBFS) attenuation=%f (%+5.2f dB) end_result=%+5.2f dB\n",
815 level_compressor.get_level(), 20.0 * log10(level_compressor.get_level()),
816 level_compressor.get_attenuation(), 20.0 * log10(level_compressor.get_attenuation()),
817 20.0 * log10(level_compressor.get_level() * level_compressor.get_attenuation() * makeup_gain));
820 // float limiter_att, compressor_att;
822 // The real compressor.
823 if (compressor_enabled) {
824 float threshold = pow(10.0f, compressor_threshold_dbfs / 20.0f);
826 float attack_time = 0.005f;
827 float release_time = 0.040f;
828 float makeup_gain = 2.0f; // +6 dB.
829 compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
830 // compressor_att = compressor.get_attenuation();
833 // Finally a limiter at -4 dB (so, -10 dBFS) to take out the worst peaks only.
834 // Note that since ratio is not infinite, we could go slightly higher than this.
835 if (limiter_enabled) {
836 float threshold = pow(10.0f, limiter_threshold_dbfs / 20.0f);
838 float attack_time = 0.0f; // Instant.
839 float release_time = 0.020f;
840 float makeup_gain = 1.0f; // 0 dB.
841 limiter.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
842 // limiter_att = limiter.get_attenuation();
845 // printf("limiter=%+5.1f compressor=%+5.1f\n", 20.0*log10(limiter_att), 20.0*log10(compressor_att));
847 // Upsample 4x to find interpolated peak.
848 peak_resampler.inp_data = samples_out.data();
849 peak_resampler.inp_count = samples_out.size() / 2;
851 vector<float> interpolated_samples_out;
852 interpolated_samples_out.resize(samples_out.size());
853 while (peak_resampler.inp_count > 0) { // About four iterations.
854 peak_resampler.out_data = &interpolated_samples_out[0];
855 peak_resampler.out_count = interpolated_samples_out.size() / 2;
856 peak_resampler.process();
857 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
858 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
859 peak_resampler.out_data = nullptr;
862 // At this point, we are most likely close to +0 LU, but all of our
863 // measurements have been on raw sample values, not R128 values.
864 // So we have a final makeup gain to get us to +0 LU; the gain
865 // adjustments required should be relatively small, and also, the
866 // offset shouldn't change much (only if the type of audio changes
867 // significantly). Thus, we shoot for updating this value basically
868 // “whenever we process buffers”, since the R128 calculation isn't exactly
869 // something we get out per-sample.
871 // Note that there's a feedback loop here, so we choose a very slow filter
872 // (half-time of 100 seconds).
873 double target_loudness_factor, alpha;
875 unique_lock<mutex> lock(compressor_mutex);
876 double loudness_lu = r128.loudness_M() - ref_level_lufs;
877 double current_makeup_lu = 20.0f * log10(final_makeup_gain);
878 target_loudness_factor = pow(10.0f, -loudness_lu / 20.0f);
880 // If we're outside +/- 5 LU uncorrected, we don't count it as
881 // a normal signal (probably silence) and don't change the
882 // correction factor; just apply what we already have.
883 if (fabs(loudness_lu - current_makeup_lu) >= 5.0 || !final_makeup_gain_auto) {
886 // Formula adapted from
887 // https://en.wikipedia.org/wiki/Low-pass_filter#Simple_infinite_impulse_response_filter.
888 const double half_time_s = 100.0;
889 const double fc_mul_2pi_delta_t = 1.0 / (half_time_s * OUTPUT_FREQUENCY);
890 alpha = fc_mul_2pi_delta_t / (fc_mul_2pi_delta_t + 1.0);
893 double m = final_makeup_gain;
894 for (size_t i = 0; i < samples_out.size(); i += 2) {
895 samples_out[i + 0] *= m;
896 samples_out[i + 1] *= m;
897 m += (target_loudness_factor - m) * alpha;
899 final_makeup_gain = m;
902 // Find R128 levels and L/R correlation.
903 vector<float> left, right;
904 deinterleave_samples(samples_out, &left, &right);
905 float *ptrs[] = { left.data(), right.data() };
907 unique_lock<mutex> lock(compressor_mutex);
908 r128.process(left.size(), ptrs);
909 correlation.process_samples(samples_out);
912 // Send the samples to the sound card.
914 alsa->write(samples_out);
917 // And finally add them to the output.
918 h264_encoder->add_audio(frame_pts_int, move(samples_out));
921 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
924 glGenVertexArrays(1, &vao);
927 glBindVertexArray(vao);
931 GLuint fbo = resource_pool->create_fbo(dst_tex);
932 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
933 glViewport(0, 0, WIDTH/2, HEIGHT/2);
936 glUseProgram(cbcr_program_num);
939 glActiveTexture(GL_TEXTURE0);
941 glBindTexture(GL_TEXTURE_2D, src_tex);
943 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
945 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
947 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
950 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
951 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
953 glBindBuffer(GL_ARRAY_BUFFER, cbcr_vbo);
956 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
957 glEnableVertexAttribArray(attr_index);
959 glVertexAttribPointer(attr_index, 2, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(0));
963 glDrawArrays(GL_TRIANGLES, 0, 3);
966 for (GLint attr_index : { cbcr_position_attribute_index, cbcr_texcoord_attribute_index }) {
967 glDisableVertexAttribArray(attr_index);
973 glBindFramebuffer(GL_FRAMEBUFFER, 0);
976 resource_pool->release_fbo(fbo);
977 glDeleteVertexArrays(1, &vao);
980 void Mixer::release_display_frame(DisplayFrame *frame)
982 for (GLuint texnum : frame->temp_textures) {
983 resource_pool->release_2d_texture(texnum);
985 frame->temp_textures.clear();
986 frame->ready_fence.reset();
987 frame->input_frames.clear();
992 mixer_thread = thread(&Mixer::thread_func, this);
993 audio_thread = thread(&Mixer::audio_thread_func, this);
1000 audio_thread.join();
1003 void Mixer::transition_clicked(int transition_num)
1005 theme->transition_clicked(transition_num, pts());
1008 void Mixer::channel_clicked(int preview_num)
1010 theme->channel_clicked(preview_num);
1013 void Mixer::reset_meters()
1015 peak_resampler.reset();
1018 r128.integr_start();
1019 correlation.reset();
1022 Mixer::OutputChannel::~OutputChannel()
1024 if (has_current_frame) {
1025 parent->release_display_frame(¤t_frame);
1027 if (has_ready_frame) {
1028 parent->release_display_frame(&ready_frame);
1032 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
1034 // Store this frame for display. Remove the ready frame if any
1035 // (it was seemingly never used).
1037 unique_lock<mutex> lock(frame_mutex);
1038 if (has_ready_frame) {
1039 parent->release_display_frame(&ready_frame);
1041 ready_frame = frame;
1042 has_ready_frame = true;
1045 if (has_new_frame_ready_callback) {
1046 new_frame_ready_callback();
1050 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
1052 unique_lock<mutex> lock(frame_mutex);
1053 if (!has_current_frame && !has_ready_frame) {
1057 if (has_current_frame && has_ready_frame) {
1058 // We have a new ready frame. Toss the current one.
1059 parent->release_display_frame(¤t_frame);
1060 has_current_frame = false;
1062 if (has_ready_frame) {
1063 assert(!has_current_frame);
1064 current_frame = ready_frame;
1065 ready_frame.ready_fence.reset(); // Drop the refcount.
1066 ready_frame.input_frames.clear(); // Drop the refcounts.
1067 has_current_frame = true;
1068 has_ready_frame = false;
1071 *frame = current_frame;
1075 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
1077 new_frame_ready_callback = callback;
1078 has_new_frame_ready_callback = true;