10 #include <movit/effect_chain.h>
11 #include <movit/effect_util.h>
12 #include <movit/flat_input.h>
13 #include <movit/image_format.h>
14 #include <movit/resource_pool.h>
23 #include <condition_variable>
32 #include "bmusb/bmusb.h"
35 #include "h264encode.h"
36 #include "pbo_frame_allocator.h"
37 #include "ref_counted_gl_sync.h"
42 using namespace movit;
44 using namespace std::placeholders;
46 Mixer *global_mixer = nullptr;
50 void convert_fixed24_to_fp32(float *dst, size_t out_channels, const uint8_t *src, size_t in_channels, size_t num_samples)
52 for (size_t i = 0; i < num_samples; ++i) {
53 for (size_t j = 0; j < out_channels; ++j) {
57 uint32_t s = s1 | (s1 << 8) | (s2 << 16) | (s3 << 24);
58 dst[i * out_channels + j] = int(s) * (1.0f / 4294967296.0f);
60 src += 3 * (in_channels - out_channels);
66 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
67 : httpd(LOCAL_DUMP_FILE_NAME, WIDTH, HEIGHT),
69 mixer_surface(create_surface(format)),
70 h264_encoder_surface(create_surface(format)),
71 level_compressor(OUTPUT_FREQUENCY),
72 limiter(OUTPUT_FREQUENCY),
73 compressor(OUTPUT_FREQUENCY)
77 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
80 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
81 // will be halved when sampling them, and we need to compensate here.
82 movit_texel_subpixel_precision /= 2.0;
84 resource_pool.reset(new ResourcePool);
85 theme.reset(new Theme("theme.lua", resource_pool.get(), num_cards));
86 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
87 output_channel[i].parent = this;
90 ImageFormat inout_format;
91 inout_format.color_space = COLORSPACE_sRGB;
92 inout_format.gamma_curve = GAMMA_sRGB;
94 // Display chain; shows the live output produced by the main chain (its RGBA version).
95 display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
97 display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT); // FIXME: GL_UNSIGNED_BYTE is really wrong.
98 display_chain->add_input(display_input);
99 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
100 display_chain->set_dither_bits(0); // Don't bother.
101 display_chain->finalize();
103 h264_encoder.reset(new H264Encoder(h264_encoder_surface, WIDTH, HEIGHT, &httpd));
105 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
106 printf("Configuring card %d...\n", card_index);
107 CaptureCard *card = &cards[card_index];
108 card->usb = new BMUSBCapture(card_index);
109 card->usb->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
110 card->frame_allocator.reset(new PBOFrameAllocator(WIDTH * (HEIGHT+EXTRAHEIGHT) * 2 + 44, WIDTH, HEIGHT));
111 card->usb->set_video_frame_allocator(card->frame_allocator.get());
112 card->surface = create_surface(format);
113 card->usb->set_dequeue_thread_callbacks(
115 eglBindAPI(EGL_OPENGL_API);
116 card->context = create_context(card->surface);
117 if (!make_current(card->context, card->surface)) {
118 printf("failed to create bmusb context\n");
123 resource_pool->clean_context();
125 card->resampling_queue.reset(new ResamplingQueue(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
126 card->usb->configure_card();
129 BMUSBCapture::start_bm_thread();
131 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
132 cards[card_index].usb->start_bm_capture();
135 //chain->enable_phase_timing(true);
137 // Set up stuff for NV12 conversion.
140 string cbcr_vert_shader = read_file("vs-cbcr.130.vert");
141 string cbcr_frag_shader =
144 "uniform sampler2D cbcr_tex; \n"
146 " gl_FragColor = texture2D(cbcr_tex, tc0); \n"
148 cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader);
150 r128.init(2, OUTPUT_FREQUENCY);
153 locut.init(FILTER_HPF, 2);
155 // hlen=16 is pretty low quality, but we use quite a bit of CPU otherwise,
156 // and there's a limit to how important the peak meter is.
157 peak_resampler.setup(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY * 4, /*num_channels=*/2, /*hlen=*/16);
159 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
164 resource_pool->release_glsl_program(cbcr_program_num);
165 BMUSBCapture::stop_bm_thread();
167 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
169 unique_lock<mutex> lock(bmusb_mutex);
170 cards[card_index].should_quit = true; // Unblock thread.
171 cards[card_index].new_data_ready_changed.notify_all();
173 cards[card_index].usb->stop_dequeue_thread();
176 h264_encoder.reset(nullptr);
181 int unwrap_timecode(uint16_t current_wrapped, int last)
183 uint16_t last_wrapped = last & 0xffff;
184 if (current_wrapped > last_wrapped) {
185 return (last & ~0xffff) | current_wrapped;
187 return 0x10000 + ((last & ~0xffff) | current_wrapped);
191 float find_peak(const float *samples, size_t num_samples)
193 float m = fabs(samples[0]);
194 for (size_t i = 1; i < num_samples; ++i) {
195 m = std::max(m, fabs(samples[i]));
200 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
202 size_t num_samples = in.size() / 2;
203 out_l->resize(num_samples);
204 out_r->resize(num_samples);
206 const float *inptr = in.data();
207 float *lptr = &(*out_l)[0];
208 float *rptr = &(*out_r)[0];
209 for (size_t i = 0; i < num_samples; ++i) {
215 // Returns length of a frame with the given format, in TIMEBASE units.
216 int64_t find_frame_length(uint16_t video_format)
218 if (video_format == 0x0800) {
219 // No video signal. These green pseudo-frames seem to come at about 30.13 Hz.
220 // It's a strange thing, but what can you do.
221 return TIMEBASE * 100 / 3013;
223 if ((video_format & 0xe800) != 0xe800) {
224 printf("Video format 0x%04x does not appear to be a video format. Assuming 60 Hz.\n",
226 return TIMEBASE / 60;
229 // 0x8 seems to be a flag about availability of deep color on the input,
230 // except when it's not (e.g. it's the only difference between NTSC 23.98
231 // and PAL). Rather confusing. But we clear it here nevertheless, because
232 // usually it doesn't mean anything.
234 // We don't really handle interlaced formats at all yet.
235 uint16_t normalized_video_format = video_format & ~0xe808;
236 if (normalized_video_format == 0x0143) { // 720p50.
237 return TIMEBASE / 50;
238 } else if (normalized_video_format == 0x0103) { // 720p60.
239 return TIMEBASE / 60;
240 } else if (normalized_video_format == 0x0121) { // 720p59.94.
241 return TIMEBASE * 1001 / 60000;
242 } else if (normalized_video_format == 0x01c3 || // 1080p30.
243 normalized_video_format == 0x0003) { // 1080i60.
244 return TIMEBASE / 30;
245 } else if (normalized_video_format == 0x01e1 || // 1080p29.97.
246 normalized_video_format == 0x0021 || // 1080i59.94.
247 video_format == 0xe901 || // NTSC (480i59.94, I suppose).
248 video_format == 0xe9c1 || // Ditto.
249 video_format == 0xe801) { // Ditto.
250 return TIMEBASE * 1001 / 30000;
251 } else if (normalized_video_format == 0x0063 || // 1080p25.
252 normalized_video_format == 0x0043 || // 1080i50.
253 video_format == 0xe909) { // PAL (576i50, I suppose).
254 return TIMEBASE / 25;
255 } else if (normalized_video_format == 0x008e) { // 1080p24.
256 return TIMEBASE / 24;
257 } else if (normalized_video_format == 0x00a1) { // 1080p23.98.
258 return TIMEBASE * 1001 / 24000;
259 return TIMEBASE / 25;
261 printf("Unknown video format 0x%04x. Assuming 60 Hz.\n", video_format);
262 return TIMEBASE / 60;
268 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
269 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
270 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
272 CaptureCard *card = &cards[card_index];
274 int64_t frame_length = find_frame_length(video_format);
276 if (audio_frame.len - audio_offset > 30000) {
277 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",
278 card_index, int(audio_frame.len), int(audio_offset),
279 timecode, int(video_frame.len), int(video_offset), video_format);
280 if (video_frame.owner) {
281 video_frame.owner->release_frame(video_frame);
283 if (audio_frame.owner) {
284 audio_frame.owner->release_frame(audio_frame);
289 int64_t local_pts = card->next_local_pts;
290 int dropped_frames = 0;
291 if (card->last_timecode != -1) {
292 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
294 card->last_timecode = timecode;
296 // Convert the audio to stereo fp32 and add it.
297 size_t num_samples = (audio_frame.len >= audio_offset) ? (audio_frame.len - audio_offset) / 8 / 3 : 0;
299 audio.resize(num_samples * 2);
300 convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, 8, num_samples);
304 unique_lock<mutex> lock(card->audio_mutex);
306 if (dropped_frames > MAX_FPS * 2) {
307 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around), resetting resampler\n",
309 card->resampling_queue.reset(new ResamplingQueue(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
310 } else if (dropped_frames > 0) {
311 // Insert silence as needed. (The number of samples could be nonintegral,
312 // but resampling will save us then.)
313 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
314 card_index, dropped_frames, timecode);
315 vector<float> silence;
316 silence.resize((OUTPUT_FREQUENCY * frame_length / TIMEBASE) * 2);
317 for (int i = 0; i < dropped_frames; ++i) {
318 card->resampling_queue->add_input_samples(local_pts / double(TIMEBASE), silence.data(), silence.size() / 2);
319 // Note that if the format changed in the meantime, we have
320 // no way of detecting that; we just have to assume the frame length
321 // is always the same.
322 local_pts += frame_length;
325 card->resampling_queue->add_input_samples(local_pts / double(TIMEBASE), audio.data(), num_samples);
326 card->next_local_pts = local_pts + frame_length;
329 // Done with the audio, so release it.
330 if (audio_frame.owner) {
331 audio_frame.owner->release_frame(audio_frame);
335 // Wait until the previous frame was consumed.
336 unique_lock<mutex> lock(bmusb_mutex);
337 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
338 if (card->should_quit) return;
341 if (video_frame.len - video_offset != WIDTH * (HEIGHT+EXTRAHEIGHT) * 2) {
342 if (video_frame.len != 0) {
343 printf("Card %d: Dropping video frame with wrong length (%ld)\n",
344 card_index, video_frame.len - video_offset);
346 if (video_frame.owner) {
347 video_frame.owner->release_frame(video_frame);
350 // Still send on the information that we _had_ a frame, even though it's corrupted,
351 // so that pts can go up accordingly.
353 unique_lock<mutex> lock(bmusb_mutex);
354 card->new_data_ready = true;
355 card->new_frame = RefCountedFrame(FrameAllocator::Frame());
356 card->new_frame_length = frame_length;
357 card->new_data_ready_fence = nullptr;
358 card->dropped_frames = dropped_frames;
359 card->new_data_ready_changed.notify_all();
364 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
365 GLuint pbo = userdata->pbo;
367 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
369 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
371 //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
374 // Upload the textures.
375 glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
377 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, WIDTH, HEIGHT, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET((WIDTH * (HEIGHT+EXTRAHEIGHT) * 2 + 44) / 2 + WIDTH * 25 + 22));
379 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
381 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, WIDTH/2, HEIGHT, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(WIDTH * 25 + 22));
383 glBindTexture(GL_TEXTURE_2D, 0);
385 GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
387 assert(fence != nullptr);
390 unique_lock<mutex> lock(bmusb_mutex);
391 card->new_data_ready = true;
392 card->new_frame = RefCountedFrame(video_frame);
393 card->new_frame_length = frame_length;
394 card->new_data_ready_fence = fence;
395 card->dropped_frames = dropped_frames;
396 card->new_data_ready_changed.notify_all();
400 void Mixer::thread_func()
402 eglBindAPI(EGL_OPENGL_API);
403 QOpenGLContext *context = create_context(mixer_surface);
404 if (!make_current(context, mixer_surface)) {
409 struct timespec start, now;
410 clock_gettime(CLOCK_MONOTONIC, &start);
413 int dropped_frames = 0;
415 while (!should_quit) {
416 CaptureCard card_copy[MAX_CARDS];
417 int num_samples[MAX_CARDS];
420 unique_lock<mutex> lock(bmusb_mutex);
422 // The first card is the master timer, so wait for it to have a new frame.
423 // TODO: Make configurable, and with a timeout.
424 cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
426 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
427 CaptureCard *card = &cards[card_index];
428 card_copy[card_index].usb = card->usb;
429 card_copy[card_index].new_data_ready = card->new_data_ready;
430 card_copy[card_index].new_frame = card->new_frame;
431 card_copy[card_index].new_frame_length = card->new_frame_length;
432 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
433 card_copy[card_index].dropped_frames = card->dropped_frames;
434 card->new_data_ready = false;
435 card->new_data_ready_changed.notify_all();
437 int num_samples_times_timebase = OUTPUT_FREQUENCY * card->new_frame_length + card->fractional_samples;
438 num_samples[card_index] = num_samples_times_timebase / TIMEBASE;
439 card->fractional_samples = num_samples_times_timebase % TIMEBASE;
443 // Resample the audio as needed, including from previously dropped frames.
444 for (unsigned frame_num = 0; frame_num < card_copy[0].dropped_frames + 1; ++frame_num) {
446 // Signal to the audio thread to process this frame.
447 unique_lock<mutex> lock(audio_mutex);
448 audio_task_queue.push(AudioTask{pts_int, num_samples[0]});
449 audio_task_queue_changed.notify_one();
451 if (frame_num != card_copy[0].dropped_frames) {
452 // For dropped frames, increase the pts. Note that if the format changed
453 // in the meantime, we have no way of detecting that; we just have to
454 // assume the frame length is always the same.
456 pts_int += card_copy[0].new_frame_length;
460 if (audio_level_callback != nullptr) {
461 double loudness_s = r128.loudness_S();
462 double loudness_i = r128.integrated();
463 double loudness_range_low = r128.range_min();
464 double loudness_range_high = r128.range_max();
466 audio_level_callback(loudness_s, 20.0 * log10(peak),
467 loudness_i, loudness_range_low, loudness_range_high,
468 last_gain_staging_db);
471 for (unsigned card_index = 1; card_index < num_cards; ++card_index) {
472 if (card_copy[card_index].new_data_ready && card_copy[card_index].new_frame->len == 0) {
473 ++card_copy[card_index].dropped_frames;
475 if (card_copy[card_index].dropped_frames > 0) {
476 printf("Card %u dropped %d frames before this\n",
477 card_index, int(card_copy[card_index].dropped_frames));
481 // If the first card is reporting a corrupted or otherwise dropped frame,
482 // just increase the pts (skipping over this frame) and don't try to compute anything new.
483 if (card_copy[0].new_frame->len == 0) {
485 pts_int += card_copy[0].new_frame_length;
489 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
490 CaptureCard *card = &card_copy[card_index];
491 if (!card->new_data_ready || card->new_frame->len == 0)
494 assert(card->new_frame != nullptr);
495 bmusb_current_rendering_frame[card_index] = card->new_frame;
498 // The new texture might still be uploaded,
499 // tell the GPU to wait until it's there.
500 if (card->new_data_ready_fence) {
501 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
503 glDeleteSync(card->new_data_ready_fence);
506 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
507 theme->set_input_textures(card_index, userdata->tex_y, userdata->tex_cbcr);
510 // Get the main chain from the theme, and set its state immediately.
511 pair<EffectChain *, function<void()>> theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT);
512 EffectChain *chain = theme_main_chain.first;
513 theme_main_chain.second();
515 GLuint y_tex, cbcr_tex;
516 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
519 // Render main chain.
520 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
521 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
522 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
524 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
525 resource_pool->release_fbo(fbo);
527 subsample_chroma(cbcr_full_tex, cbcr_tex);
528 resource_pool->release_2d_texture(cbcr_full_tex);
530 // Set the right state for rgba_tex.
531 glBindFramebuffer(GL_FRAMEBUFFER, 0);
532 glBindTexture(GL_TEXTURE_2D, rgba_tex);
533 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
534 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
535 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
537 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
540 // Make sure the H.264 gets a reference to all the
541 // input frames needed, so that they are not released back
542 // until the rendering is done.
543 vector<RefCountedFrame> input_frames;
544 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
545 input_frames.push_back(bmusb_current_rendering_frame[card_index]);
547 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
548 h264_encoder->end_frame(fence, pts_int + av_delay, input_frames);
550 pts_int += card_copy[0].new_frame_length;
552 // The live frame just shows the RGBA texture we just rendered.
553 // It owns rgba_tex now.
554 DisplayFrame live_frame;
555 live_frame.chain = display_chain.get();
556 live_frame.setup_chain = [this, rgba_tex]{
557 display_input->set_texture_num(rgba_tex);
559 live_frame.ready_fence = fence;
560 live_frame.input_frames = {};
561 live_frame.temp_textures = { rgba_tex };
562 output_channel[OUTPUT_LIVE].output_frame(live_frame);
564 // Set up preview and any additional channels.
565 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
566 DisplayFrame display_frame;
567 pair<EffectChain *, function<void()>> chain = theme->get_chain(i, pts(), WIDTH, HEIGHT); // FIXME: dimensions
568 display_frame.chain = chain.first;
569 display_frame.setup_chain = chain.second;
570 display_frame.ready_fence = fence;
572 // FIXME: possible to do better?
573 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
574 display_frame.input_frames.push_back(bmusb_current_rendering_frame[card_index]);
576 display_frame.temp_textures = {};
577 output_channel[i].output_frame(display_frame);
580 clock_gettime(CLOCK_MONOTONIC, &now);
581 double elapsed = now.tv_sec - start.tv_sec +
582 1e-9 * (now.tv_nsec - start.tv_nsec);
583 if (frame % 100 == 0) {
584 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
585 frame, dropped_frames, elapsed, frame / elapsed,
586 1e3 * elapsed / frame);
587 // chain->print_phase_timing();
591 // Reset every 100 frames, so that local variations in frame times
592 // (especially for the first few frames, when the shaders are
593 // compiled etc.) don't make it hard to measure for the entire
594 // remaining duration of the program.
595 if (frame == 10000) {
603 resource_pool->clean_context();
606 void Mixer::audio_thread_func()
608 while (!should_quit) {
612 unique_lock<mutex> lock(audio_mutex);
613 audio_task_queue_changed.wait(lock, [this]{ return !audio_task_queue.empty(); });
614 task = audio_task_queue.front();
615 audio_task_queue.pop();
618 process_audio_one_frame(task.pts_int, task.num_samples);
622 void Mixer::process_audio_one_frame(int64_t frame_pts_int, int num_samples)
624 vector<float> samples_card;
625 vector<float> samples_out;
626 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
627 samples_card.resize(num_samples * 2);
629 unique_lock<mutex> lock(cards[card_index].audio_mutex);
630 if (!cards[card_index].resampling_queue->get_output_samples(double(frame_pts_int) / TIMEBASE, &samples_card[0], num_samples)) {
631 printf("Card %d reported previous underrun.\n", card_index);
634 // TODO: Allow using audio from the other card(s) as well.
635 if (card_index == 0) {
636 samples_out = move(samples_card);
640 // Cut away everything under 120 Hz (or whatever the cutoff is);
641 // we don't need it for voice, and it will reduce headroom
642 // and confuse the compressor. (In particular, any hums at 50 or 60 Hz
643 // should be dampened.)
644 locut.render(samples_out.data(), samples_out.size() / 2, locut_cutoff_hz * 2.0 * M_PI / OUTPUT_FREQUENCY, 0.5f);
646 // Apply a level compressor to get the general level right.
647 // Basically, if it's over about -40 dBFS, we squeeze it down to that level
648 // (or more precisely, near it, since we don't use infinite ratio),
649 // then apply a makeup gain to get it to -14 dBFS. -14 dBFS is, of course,
650 // entirely arbitrary, but from practical tests with speech, it seems to
651 // put ut around -23 LUFS, so it's a reasonable starting point for later use.
652 float ref_level_dbfs = -14.0f;
654 float threshold = 0.01f; // -40 dBFS.
656 float attack_time = 0.5f;
657 float release_time = 20.0f;
658 float makeup_gain = pow(10.0f, (ref_level_dbfs - (-40.0f)) / 20.0f); // +26 dB.
659 level_compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
660 last_gain_staging_db = 20.0 * log10(level_compressor.get_attenuation() * makeup_gain);
664 printf("level=%f (%+5.2f dBFS) attenuation=%f (%+5.2f dB) end_result=%+5.2f dB\n",
665 level_compressor.get_level(), 20.0 * log10(level_compressor.get_level()),
666 level_compressor.get_attenuation(), 20.0 * log10(level_compressor.get_attenuation()),
667 20.0 * log10(level_compressor.get_level() * level_compressor.get_attenuation() * makeup_gain));
670 // float limiter_att, compressor_att;
672 // The real compressor.
673 if (compressor_enabled) {
674 float threshold = pow(10.0f, compressor_threshold_dbfs / 20.0f);
676 float attack_time = 0.005f;
677 float release_time = 0.040f;
678 float makeup_gain = 2.0f; // +6 dB.
679 compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
680 // compressor_att = compressor.get_attenuation();
683 // Finally a limiter at -4 dB (so, -10 dBFS) to take out the worst peaks only.
684 // Note that since ratio is not infinite, we could go slightly higher than this.
685 if (limiter_enabled) {
686 float threshold = pow(10.0f, limiter_threshold_dbfs / 20.0f);
688 float attack_time = 0.0f; // Instant.
689 float release_time = 0.020f;
690 float makeup_gain = 1.0f; // 0 dB.
691 limiter.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
692 // limiter_att = limiter.get_attenuation();
695 // printf("limiter=%+5.1f compressor=%+5.1f\n", 20.0*log10(limiter_att), 20.0*log10(compressor_att));
697 // Upsample 4x to find interpolated peak.
698 peak_resampler.inp_data = samples_out.data();
699 peak_resampler.inp_count = samples_out.size() / 2;
701 vector<float> interpolated_samples_out;
702 interpolated_samples_out.resize(samples_out.size());
703 while (peak_resampler.inp_count > 0) { // About four iterations.
704 peak_resampler.out_data = &interpolated_samples_out[0];
705 peak_resampler.out_count = interpolated_samples_out.size() / 2;
706 peak_resampler.process();
707 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
708 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
712 vector<float> left, right;
713 deinterleave_samples(samples_out, &left, &right);
714 float *ptrs[] = { left.data(), right.data() };
715 r128.process(left.size(), ptrs);
717 // Send the samples to the sound card.
719 alsa->write(samples_out);
722 // And finally add them to the output.
723 h264_encoder->add_audio(frame_pts_int, move(samples_out));
726 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
729 glGenVertexArrays(1, &vao);
738 glBindVertexArray(vao);
742 GLuint fbo = resource_pool->create_fbo(dst_tex);
743 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
744 glViewport(0, 0, WIDTH/2, HEIGHT/2);
747 glUseProgram(cbcr_program_num);
750 glActiveTexture(GL_TEXTURE0);
752 glBindTexture(GL_TEXTURE_2D, src_tex);
754 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
756 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
758 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
761 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
762 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
764 GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
765 GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices); // Same as vertices.
767 glDrawArrays(GL_TRIANGLES, 0, 3);
770 cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
771 cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
776 resource_pool->release_fbo(fbo);
777 glDeleteVertexArrays(1, &vao);
780 void Mixer::release_display_frame(DisplayFrame *frame)
782 for (GLuint texnum : frame->temp_textures) {
783 resource_pool->release_2d_texture(texnum);
785 frame->temp_textures.clear();
786 frame->ready_fence.reset();
787 frame->input_frames.clear();
792 mixer_thread = thread(&Mixer::thread_func, this);
793 audio_thread = thread(&Mixer::audio_thread_func, this);
803 void Mixer::transition_clicked(int transition_num)
805 theme->transition_clicked(transition_num, pts());
808 void Mixer::channel_clicked(int preview_num)
810 theme->channel_clicked(preview_num);
813 void Mixer::reset_meters()
815 peak_resampler.reset();
821 Mixer::OutputChannel::~OutputChannel()
823 if (has_current_frame) {
824 parent->release_display_frame(¤t_frame);
826 if (has_ready_frame) {
827 parent->release_display_frame(&ready_frame);
831 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
833 // Store this frame for display. Remove the ready frame if any
834 // (it was seemingly never used).
836 unique_lock<mutex> lock(frame_mutex);
837 if (has_ready_frame) {
838 parent->release_display_frame(&ready_frame);
841 has_ready_frame = true;
844 if (has_new_frame_ready_callback) {
845 new_frame_ready_callback();
849 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
851 unique_lock<mutex> lock(frame_mutex);
852 if (!has_current_frame && !has_ready_frame) {
856 if (has_current_frame && has_ready_frame) {
857 // We have a new ready frame. Toss the current one.
858 parent->release_display_frame(¤t_frame);
859 has_current_frame = false;
861 if (has_ready_frame) {
862 assert(!has_current_frame);
863 current_frame = ready_frame;
864 ready_frame.ready_fence.reset(); // Drop the refcount.
865 ready_frame.input_frames.clear(); // Drop the refcounts.
866 has_current_frame = true;
867 has_ready_frame = false;
870 *frame = current_frame;
874 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
876 new_frame_ready_callback = callback;
877 has_new_frame_ready_callback = true;