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/resource_pool.h>
13 #include <movit/util.h>
21 #include <condition_variable>
30 #include "bmusb/bmusb.h"
33 #include "h264encode.h"
34 #include "pbo_frame_allocator.h"
35 #include "ref_counted_gl_sync.h"
40 using namespace movit;
42 using namespace std::placeholders;
44 Mixer *global_mixer = nullptr;
48 void convert_fixed24_to_fp32(float *dst, size_t out_channels, const uint8_t *src, size_t in_channels, size_t num_samples)
50 for (size_t i = 0; i < num_samples; ++i) {
51 for (size_t j = 0; j < out_channels; ++j) {
55 uint32_t s = s1 | (s1 << 8) | (s2 << 16) | (s3 << 24);
56 dst[i * out_channels + j] = int(s) * (1.0f / 4294967296.0f);
58 src += 3 * (in_channels - out_channels);
62 void insert_new_frame(RefCountedFrame frame, unsigned field_num, bool interlaced, unsigned card_index, InputState *input_state)
65 for (unsigned frame_num = FRAME_HISTORY_LENGTH; frame_num --> 1; ) { // :-)
66 input_state->buffered_frames[card_index][frame_num] =
67 input_state->buffered_frames[card_index][frame_num - 1];
69 input_state->buffered_frames[card_index][0] = { frame, field_num };
71 for (unsigned frame_num = 0; frame_num < FRAME_HISTORY_LENGTH; ++frame_num) {
72 input_state->buffered_frames[card_index][frame_num] = { frame, field_num };
79 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
80 : httpd(LOCAL_DUMP_FILE_NAME, WIDTH, HEIGHT),
82 mixer_surface(create_surface(format)),
83 h264_encoder_surface(create_surface(format)),
84 level_compressor(OUTPUT_FREQUENCY),
85 limiter(OUTPUT_FREQUENCY),
86 compressor(OUTPUT_FREQUENCY)
90 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
93 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
94 // will be halved when sampling them, and we need to compensate here.
95 movit_texel_subpixel_precision /= 2.0;
97 resource_pool.reset(new ResourcePool);
98 theme.reset(new Theme("theme.lua", resource_pool.get(), num_cards));
99 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
100 output_channel[i].parent = this;
103 ImageFormat inout_format;
104 inout_format.color_space = COLORSPACE_sRGB;
105 inout_format.gamma_curve = GAMMA_sRGB;
107 // Display chain; shows the live output produced by the main chain (its RGBA version).
108 display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
110 display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT); // FIXME: GL_UNSIGNED_BYTE is really wrong.
111 display_chain->add_input(display_input);
112 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
113 display_chain->set_dither_bits(0); // Don't bother.
114 display_chain->finalize();
116 h264_encoder.reset(new H264Encoder(h264_encoder_surface, WIDTH, HEIGHT, &httpd));
118 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
119 printf("Configuring card %d...\n", card_index);
120 CaptureCard *card = &cards[card_index];
121 card->usb = new BMUSBCapture(card_index);
122 card->usb->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
123 card->frame_allocator.reset(new PBOFrameAllocator(8 << 20, WIDTH, HEIGHT)); // 8 MB.
124 card->usb->set_video_frame_allocator(card->frame_allocator.get());
125 card->surface = create_surface(format);
126 card->usb->set_dequeue_thread_callbacks(
128 eglBindAPI(EGL_OPENGL_API);
129 card->context = create_context(card->surface);
130 if (!make_current(card->context, card->surface)) {
131 printf("failed to create bmusb context\n");
136 resource_pool->clean_context();
138 card->resampling_queue.reset(new ResamplingQueue(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
139 card->usb->configure_card();
142 BMUSBCapture::start_bm_thread();
144 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
145 cards[card_index].usb->start_bm_capture();
148 // Set up stuff for NV12 conversion.
151 string cbcr_vert_shader = read_file("vs-cbcr.130.vert");
152 string cbcr_frag_shader =
155 "uniform sampler2D cbcr_tex; \n"
157 " gl_FragColor = texture2D(cbcr_tex, tc0); \n"
159 vector<string> frag_shader_outputs;
160 cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader, frag_shader_outputs);
162 r128.init(2, OUTPUT_FREQUENCY);
165 locut.init(FILTER_HPF, 2);
167 // hlen=16 is pretty low quality, but we use quite a bit of CPU otherwise,
168 // and there's a limit to how important the peak meter is.
169 peak_resampler.setup(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY * 4, /*num_channels=*/2, /*hlen=*/16);
171 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
176 resource_pool->release_glsl_program(cbcr_program_num);
177 BMUSBCapture::stop_bm_thread();
179 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
181 unique_lock<mutex> lock(bmusb_mutex);
182 cards[card_index].should_quit = true; // Unblock thread.
183 cards[card_index].new_data_ready_changed.notify_all();
185 cards[card_index].usb->stop_dequeue_thread();
188 h264_encoder.reset(nullptr);
193 int unwrap_timecode(uint16_t current_wrapped, int last)
195 uint16_t last_wrapped = last & 0xffff;
196 if (current_wrapped > last_wrapped) {
197 return (last & ~0xffff) | current_wrapped;
199 return 0x10000 + ((last & ~0xffff) | current_wrapped);
203 float find_peak(const float *samples, size_t num_samples)
205 float m = fabs(samples[0]);
206 for (size_t i = 1; i < num_samples; ++i) {
207 m = std::max(m, fabs(samples[i]));
212 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
214 size_t num_samples = in.size() / 2;
215 out_l->resize(num_samples);
216 out_r->resize(num_samples);
218 const float *inptr = in.data();
219 float *lptr = &(*out_l)[0];
220 float *rptr = &(*out_r)[0];
221 for (size_t i = 0; i < num_samples; ++i) {
229 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
230 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
231 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
233 CaptureCard *card = &cards[card_index];
235 unsigned width, height, second_field_start, frame_rate_nom, frame_rate_den, extra_lines_top, extra_lines_bottom;
238 decode_video_format(video_format, &width, &height, &second_field_start, &extra_lines_top, &extra_lines_bottom,
239 &frame_rate_nom, &frame_rate_den, &interlaced); // Ignore return value for now.
240 int64_t frame_length = TIMEBASE * frame_rate_den / frame_rate_nom;
242 size_t num_samples = (audio_frame.len >= audio_offset) ? (audio_frame.len - audio_offset) / 8 / 3 : 0;
243 if (num_samples > OUTPUT_FREQUENCY / 10) {
244 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",
245 card_index, int(audio_frame.len), int(audio_offset),
246 timecode, int(video_frame.len), int(video_offset), video_format);
247 if (video_frame.owner) {
248 video_frame.owner->release_frame(video_frame);
250 if (audio_frame.owner) {
251 audio_frame.owner->release_frame(audio_frame);
256 int64_t local_pts = card->next_local_pts;
257 int dropped_frames = 0;
258 if (card->last_timecode != -1) {
259 dropped_frames = unwrap_timecode(timecode, card->last_timecode) - card->last_timecode - 1;
262 // Convert the audio to stereo fp32 and add it.
264 audio.resize(num_samples * 2);
265 convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, 8, num_samples);
269 unique_lock<mutex> lock(card->audio_mutex);
271 // Number of samples per frame if we need to insert silence.
272 // (Could be nonintegral, but resampling will save us then.)
273 int silence_samples = OUTPUT_FREQUENCY * frame_rate_den / frame_rate_nom;
275 if (dropped_frames > MAX_FPS * 2) {
276 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around; from 0x%04x to 0x%04x), resetting resampler\n",
277 card_index, card->last_timecode, timecode);
278 card->resampling_queue.reset(new ResamplingQueue(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
280 } else if (dropped_frames > 0) {
281 // Insert silence as needed.
282 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
283 card_index, dropped_frames, timecode);
284 vector<float> silence(silence_samples * 2, 0.0f);
285 for (int i = 0; i < dropped_frames; ++i) {
286 card->resampling_queue->add_input_samples(local_pts / double(TIMEBASE), silence.data(), silence_samples);
287 // Note that if the format changed in the meantime, we have
288 // no way of detecting that; we just have to assume the frame length
289 // is always the same.
290 local_pts += frame_length;
293 if (num_samples == 0) {
294 audio.resize(silence_samples * 2);
295 num_samples = silence_samples;
297 card->resampling_queue->add_input_samples(local_pts / double(TIMEBASE), audio.data(), num_samples);
298 card->next_local_pts = local_pts + frame_length;
301 card->last_timecode = timecode;
303 // Done with the audio, so release it.
304 if (audio_frame.owner) {
305 audio_frame.owner->release_frame(audio_frame);
309 // Wait until the previous frame was consumed.
310 unique_lock<mutex> lock(bmusb_mutex);
311 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
312 if (card->should_quit) return;
315 if (video_frame.len - video_offset == 0 ||
316 video_frame.len - video_offset != size_t(width * (height + extra_lines_top + extra_lines_bottom) * 2)) {
317 if (video_frame.len != 0) {
318 printf("Card %d: Dropping video frame with wrong length (%ld)\n",
319 card_index, video_frame.len - video_offset);
321 if (video_frame.owner) {
322 video_frame.owner->release_frame(video_frame);
325 // Still send on the information that we _had_ a frame, even though it's corrupted,
326 // so that pts can go up accordingly.
328 unique_lock<mutex> lock(bmusb_mutex);
329 card->new_data_ready = true;
330 card->new_frame = RefCountedFrame(FrameAllocator::Frame());
331 card->new_frame_length = frame_length;
332 card->new_frame_interlaced = false;
333 card->new_data_ready_fence = nullptr;
334 card->dropped_frames = dropped_frames;
335 card->new_data_ready_changed.notify_all();
340 PBOFrameAllocator::Userdata *userdata = (PBOFrameAllocator::Userdata *)video_frame.userdata;
342 unsigned num_fields = interlaced ? 2 : 1;
343 timespec frame_upload_start;
345 // Send the two fields along as separate frames; the other side will need to add
346 // a deinterlacer to actually get this right.
347 assert(height % 2 == 0);
349 assert(frame_length % 2 == 0);
352 clock_gettime(CLOCK_MONOTONIC, &frame_upload_start);
354 userdata->last_interlaced = interlaced;
355 RefCountedFrame new_frame(video_frame);
357 // Upload the textures.
358 size_t cbcr_width = width / 2;
359 size_t cbcr_offset = video_offset / 2;
360 size_t y_offset = video_frame.size / 2 + video_offset / 2;
362 for (unsigned field = 0; field < num_fields; ++field) {
363 unsigned field_start_line = (field == 1) ? second_field_start : extra_lines_top + field * (height + 22);
365 if (userdata->tex_y[field] == 0 ||
366 userdata->tex_cbcr[field] == 0 ||
367 width != userdata->last_width[field] ||
368 height != userdata->last_height[field]) {
369 // We changed resolution since last use of this texture, so we need to create
370 // a new object. Note that this each card has its own PBOFrameAllocator,
371 // we don't need to worry about these flip-flopping between resolutions.
372 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
374 glTexImage2D(GL_TEXTURE_2D, 0, GL_RG8, cbcr_width, height, 0, GL_RG, GL_UNSIGNED_BYTE, nullptr);
376 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
378 glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
380 userdata->last_width[field] = width;
381 userdata->last_height[field] = height;
384 GLuint pbo = userdata->pbo;
386 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
388 glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
391 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr[field]);
393 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, cbcr_width, height, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(cbcr_offset + cbcr_width * field_start_line * sizeof(uint16_t)));
395 glBindTexture(GL_TEXTURE_2D, userdata->tex_y[field]);
397 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET(y_offset + width * field_start_line));
399 glBindTexture(GL_TEXTURE_2D, 0);
401 GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
403 assert(fence != nullptr);
406 // Don't upload the second field as fast as we can; wait until
407 // the field time has approximately passed. (Otherwise, we could
408 // get timing jitter against the other sources, and possibly also
409 // against the video display, although the latter is not as critical.)
410 // This requires our system clock to be reasonably close to the
411 // video clock, but that's not an unreasonable assumption.
412 timespec second_field_start;
413 second_field_start.tv_nsec = frame_upload_start.tv_nsec +
414 frame_length * 1000000000 / TIMEBASE;
415 second_field_start.tv_sec = frame_upload_start.tv_sec +
416 second_field_start.tv_nsec / 1000000000;
417 second_field_start.tv_nsec %= 1000000000;
419 while (clock_nanosleep(CLOCK_MONOTONIC, TIMER_ABSTIME,
420 &second_field_start, nullptr) == -1 &&
425 unique_lock<mutex> lock(bmusb_mutex);
426 card->new_data_ready = true;
427 card->new_frame = new_frame;
428 card->new_frame_length = frame_length;
429 card->new_frame_field = field;
430 card->new_frame_interlaced = interlaced;
431 card->new_data_ready_fence = fence;
432 card->dropped_frames = dropped_frames;
433 card->new_data_ready_changed.notify_all();
435 if (field != num_fields - 1) {
436 // Wait until the previous frame was consumed.
437 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
438 if (card->should_quit) return;
444 void Mixer::thread_func()
446 eglBindAPI(EGL_OPENGL_API);
447 QOpenGLContext *context = create_context(mixer_surface);
448 if (!make_current(context, mixer_surface)) {
453 struct timespec start, now;
454 clock_gettime(CLOCK_MONOTONIC, &start);
457 int stats_dropped_frames = 0;
459 while (!should_quit) {
460 CaptureCard card_copy[MAX_CARDS];
461 int num_samples[MAX_CARDS];
464 unique_lock<mutex> lock(bmusb_mutex);
466 // The first card is the master timer, so wait for it to have a new frame.
467 // TODO: Make configurable, and with a timeout.
468 cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
470 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
471 CaptureCard *card = &cards[card_index];
472 card_copy[card_index].usb = card->usb;
473 card_copy[card_index].new_data_ready = card->new_data_ready;
474 card_copy[card_index].new_frame = card->new_frame;
475 card_copy[card_index].new_frame_length = card->new_frame_length;
476 card_copy[card_index].new_frame_field = card->new_frame_field;
477 card_copy[card_index].new_frame_interlaced = card->new_frame_interlaced;
478 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
479 card_copy[card_index].dropped_frames = card->dropped_frames;
480 card->new_data_ready = false;
481 card->new_data_ready_changed.notify_all();
483 int num_samples_times_timebase = OUTPUT_FREQUENCY * card->new_frame_length + card->fractional_samples;
484 num_samples[card_index] = num_samples_times_timebase / TIMEBASE;
485 card->fractional_samples = num_samples_times_timebase % TIMEBASE;
486 assert(num_samples[card_index] >= 0);
490 // Resample the audio as needed, including from previously dropped frames.
491 for (unsigned frame_num = 0; frame_num < card_copy[0].dropped_frames + 1; ++frame_num) {
493 // Signal to the audio thread to process this frame.
494 unique_lock<mutex> lock(audio_mutex);
495 audio_task_queue.push(AudioTask{pts_int, num_samples[0]});
496 audio_task_queue_changed.notify_one();
498 if (frame_num != card_copy[0].dropped_frames) {
499 // For dropped frames, increase the pts. Note that if the format changed
500 // in the meantime, we have no way of detecting that; we just have to
501 // assume the frame length is always the same.
502 ++stats_dropped_frames;
503 pts_int += card_copy[0].new_frame_length;
507 if (audio_level_callback != nullptr) {
508 unique_lock<mutex> lock(r128_mutex);
509 double loudness_s = r128.loudness_S();
510 double loudness_i = r128.integrated();
511 double loudness_range_low = r128.range_min();
512 double loudness_range_high = r128.range_max();
514 audio_level_callback(loudness_s, 20.0 * log10(peak),
515 loudness_i, loudness_range_low, loudness_range_high,
516 last_gain_staging_db);
519 for (unsigned card_index = 1; card_index < num_cards; ++card_index) {
520 if (card_copy[card_index].new_data_ready && card_copy[card_index].new_frame->len == 0) {
521 ++card_copy[card_index].dropped_frames;
523 if (card_copy[card_index].dropped_frames > 0) {
524 printf("Card %u dropped %d frames before this\n",
525 card_index, int(card_copy[card_index].dropped_frames));
529 // If the first card is reporting a corrupted or otherwise dropped frame,
530 // just increase the pts (skipping over this frame) and don't try to compute anything new.
531 if (card_copy[0].new_frame->len == 0) {
532 ++stats_dropped_frames;
533 pts_int += card_copy[0].new_frame_length;
537 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
538 CaptureCard *card = &card_copy[card_index];
539 if (!card->new_data_ready || card->new_frame->len == 0)
542 assert(card->new_frame != nullptr);
543 insert_new_frame(card->new_frame, card->new_frame_field, card->new_frame_interlaced, card_index, &input_state);
546 // The new texture might still be uploaded,
547 // tell the GPU to wait until it's there.
548 if (card->new_data_ready_fence) {
549 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
551 glDeleteSync(card->new_data_ready_fence);
556 // Get the main chain from the theme, and set its state immediately.
557 Theme::Chain theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT, input_state);
558 EffectChain *chain = theme_main_chain.chain;
559 theme_main_chain.setup_chain();
560 //theme_main_chain.chain->enable_phase_timing(true);
562 GLuint y_tex, cbcr_tex;
563 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
566 // Render main chain.
567 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
568 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
569 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
571 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
572 resource_pool->release_fbo(fbo);
574 subsample_chroma(cbcr_full_tex, cbcr_tex);
575 resource_pool->release_2d_texture(cbcr_full_tex);
577 // Set the right state for rgba_tex.
578 glBindFramebuffer(GL_FRAMEBUFFER, 0);
579 glBindTexture(GL_TEXTURE_2D, rgba_tex);
580 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
581 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
582 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
584 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
587 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
588 h264_encoder->end_frame(fence, pts_int + av_delay, theme_main_chain.input_frames);
590 pts_int += card_copy[0].new_frame_length;
592 // The live frame just shows the RGBA texture we just rendered.
593 // It owns rgba_tex now.
594 DisplayFrame live_frame;
595 live_frame.chain = display_chain.get();
596 live_frame.setup_chain = [this, rgba_tex]{
597 display_input->set_texture_num(rgba_tex);
599 live_frame.ready_fence = fence;
600 live_frame.input_frames = {};
601 live_frame.temp_textures = { rgba_tex };
602 output_channel[OUTPUT_LIVE].output_frame(live_frame);
604 // Set up preview and any additional channels.
605 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
606 DisplayFrame display_frame;
607 Theme::Chain chain = theme->get_chain(i, pts(), WIDTH, HEIGHT, input_state); // FIXME: dimensions
608 display_frame.chain = chain.chain;
609 display_frame.setup_chain = chain.setup_chain;
610 display_frame.ready_fence = fence;
611 display_frame.input_frames = chain.input_frames;
612 display_frame.temp_textures = {};
613 output_channel[i].output_frame(display_frame);
616 clock_gettime(CLOCK_MONOTONIC, &now);
617 double elapsed = now.tv_sec - start.tv_sec +
618 1e-9 * (now.tv_nsec - start.tv_nsec);
619 if (frame % 100 == 0) {
620 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
621 frame, stats_dropped_frames, elapsed, frame / elapsed,
622 1e3 * elapsed / frame);
623 // chain->print_phase_timing();
627 // Reset every 100 frames, so that local variations in frame times
628 // (especially for the first few frames, when the shaders are
629 // compiled etc.) don't make it hard to measure for the entire
630 // remaining duration of the program.
631 if (frame == 10000) {
639 resource_pool->clean_context();
642 void Mixer::audio_thread_func()
644 while (!should_quit) {
648 unique_lock<mutex> lock(audio_mutex);
649 audio_task_queue_changed.wait(lock, [this]{ return !audio_task_queue.empty(); });
650 task = audio_task_queue.front();
651 audio_task_queue.pop();
654 process_audio_one_frame(task.pts_int, task.num_samples);
658 void Mixer::process_audio_one_frame(int64_t frame_pts_int, int num_samples)
660 vector<float> samples_card;
661 vector<float> samples_out;
662 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
663 samples_card.resize(num_samples * 2);
665 unique_lock<mutex> lock(cards[card_index].audio_mutex);
666 if (!cards[card_index].resampling_queue->get_output_samples(double(frame_pts_int) / TIMEBASE, &samples_card[0], num_samples)) {
667 printf("Card %d reported previous underrun.\n", card_index);
670 // TODO: Allow using audio from the other card(s) as well.
671 if (card_index == 0) {
672 samples_out = move(samples_card);
676 // Cut away everything under 120 Hz (or whatever the cutoff is);
677 // we don't need it for voice, and it will reduce headroom
678 // and confuse the compressor. (In particular, any hums at 50 or 60 Hz
679 // should be dampened.)
680 locut.render(samples_out.data(), samples_out.size() / 2, locut_cutoff_hz * 2.0 * M_PI / OUTPUT_FREQUENCY, 0.5f);
682 // Apply a level compressor to get the general level right.
683 // Basically, if it's over about -40 dBFS, we squeeze it down to that level
684 // (or more precisely, near it, since we don't use infinite ratio),
685 // then apply a makeup gain to get it to -14 dBFS. -14 dBFS is, of course,
686 // entirely arbitrary, but from practical tests with speech, it seems to
687 // put ut around -23 LUFS, so it's a reasonable starting point for later use.
688 float ref_level_dbfs = -14.0f;
690 float threshold = 0.01f; // -40 dBFS.
692 float attack_time = 0.5f;
693 float release_time = 20.0f;
694 float makeup_gain = pow(10.0f, (ref_level_dbfs - (-40.0f)) / 20.0f); // +26 dB.
695 level_compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
696 last_gain_staging_db = 20.0 * log10(level_compressor.get_attenuation() * makeup_gain);
700 printf("level=%f (%+5.2f dBFS) attenuation=%f (%+5.2f dB) end_result=%+5.2f dB\n",
701 level_compressor.get_level(), 20.0 * log10(level_compressor.get_level()),
702 level_compressor.get_attenuation(), 20.0 * log10(level_compressor.get_attenuation()),
703 20.0 * log10(level_compressor.get_level() * level_compressor.get_attenuation() * makeup_gain));
706 // float limiter_att, compressor_att;
708 // The real compressor.
709 if (compressor_enabled) {
710 float threshold = pow(10.0f, compressor_threshold_dbfs / 20.0f);
712 float attack_time = 0.005f;
713 float release_time = 0.040f;
714 float makeup_gain = 2.0f; // +6 dB.
715 compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
716 // compressor_att = compressor.get_attenuation();
719 // Finally a limiter at -4 dB (so, -10 dBFS) to take out the worst peaks only.
720 // Note that since ratio is not infinite, we could go slightly higher than this.
721 if (limiter_enabled) {
722 float threshold = pow(10.0f, limiter_threshold_dbfs / 20.0f);
724 float attack_time = 0.0f; // Instant.
725 float release_time = 0.020f;
726 float makeup_gain = 1.0f; // 0 dB.
727 limiter.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
728 // limiter_att = limiter.get_attenuation();
731 // printf("limiter=%+5.1f compressor=%+5.1f\n", 20.0*log10(limiter_att), 20.0*log10(compressor_att));
733 // Upsample 4x to find interpolated peak.
734 peak_resampler.inp_data = samples_out.data();
735 peak_resampler.inp_count = samples_out.size() / 2;
737 vector<float> interpolated_samples_out;
738 interpolated_samples_out.resize(samples_out.size());
739 while (peak_resampler.inp_count > 0) { // About four iterations.
740 peak_resampler.out_data = &interpolated_samples_out[0];
741 peak_resampler.out_count = interpolated_samples_out.size() / 2;
742 peak_resampler.process();
743 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
744 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
748 vector<float> left, right;
749 deinterleave_samples(samples_out, &left, &right);
750 float *ptrs[] = { left.data(), right.data() };
752 unique_lock<mutex> lock(r128_mutex);
753 r128.process(left.size(), ptrs);
756 // Send the samples to the sound card.
758 alsa->write(samples_out);
761 // And finally add them to the output.
762 h264_encoder->add_audio(frame_pts_int, move(samples_out));
765 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
768 glGenVertexArrays(1, &vao);
777 glBindVertexArray(vao);
781 GLuint fbo = resource_pool->create_fbo(dst_tex);
782 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
783 glViewport(0, 0, WIDTH/2, HEIGHT/2);
786 glUseProgram(cbcr_program_num);
789 glActiveTexture(GL_TEXTURE0);
791 glBindTexture(GL_TEXTURE_2D, src_tex);
793 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
795 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
797 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
800 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
801 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
803 GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
804 GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices); // Same as vertices.
806 glDrawArrays(GL_TRIANGLES, 0, 3);
809 cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
810 cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
815 resource_pool->release_fbo(fbo);
816 glDeleteVertexArrays(1, &vao);
819 void Mixer::release_display_frame(DisplayFrame *frame)
821 for (GLuint texnum : frame->temp_textures) {
822 resource_pool->release_2d_texture(texnum);
824 frame->temp_textures.clear();
825 frame->ready_fence.reset();
826 frame->input_frames.clear();
831 mixer_thread = thread(&Mixer::thread_func, this);
832 audio_thread = thread(&Mixer::audio_thread_func, this);
842 void Mixer::transition_clicked(int transition_num)
844 theme->transition_clicked(transition_num, pts());
847 void Mixer::channel_clicked(int preview_num)
849 theme->channel_clicked(preview_num);
852 void Mixer::reset_meters()
854 peak_resampler.reset();
860 Mixer::OutputChannel::~OutputChannel()
862 if (has_current_frame) {
863 parent->release_display_frame(¤t_frame);
865 if (has_ready_frame) {
866 parent->release_display_frame(&ready_frame);
870 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
872 // Store this frame for display. Remove the ready frame if any
873 // (it was seemingly never used).
875 unique_lock<mutex> lock(frame_mutex);
876 if (has_ready_frame) {
877 parent->release_display_frame(&ready_frame);
880 has_ready_frame = true;
883 if (has_new_frame_ready_callback) {
884 new_frame_ready_callback();
888 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
890 unique_lock<mutex> lock(frame_mutex);
891 if (!has_current_frame && !has_ready_frame) {
895 if (has_current_frame && has_ready_frame) {
896 // We have a new ready frame. Toss the current one.
897 parent->release_display_frame(¤t_frame);
898 has_current_frame = false;
900 if (has_ready_frame) {
901 assert(!has_current_frame);
902 current_frame = ready_frame;
903 ready_frame.ready_fence.reset(); // Drop the refcount.
904 ready_frame.input_frames.clear(); // Drop the refcounts.
905 has_current_frame = true;
906 has_ready_frame = false;
909 *frame = current_frame;
913 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
915 new_frame_ready_callback = callback;
916 has_new_frame_ready_callback = true;