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) {
217 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
218 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
219 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
221 CaptureCard *card = &cards[card_index];
223 if (audio_frame.len - audio_offset > 30000) {
224 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",
225 card_index, int(audio_frame.len), int(audio_offset),
226 timecode, int(video_frame.len), int(video_offset), video_format);
227 if (video_frame.owner) {
228 video_frame.owner->release_frame(video_frame);
230 if (audio_frame.owner) {
231 audio_frame.owner->release_frame(audio_frame);
236 int unwrapped_timecode = timecode;
237 int dropped_frames = 0;
238 if (card->last_timecode != -1) {
239 unwrapped_timecode = unwrap_timecode(unwrapped_timecode, card->last_timecode);
240 dropped_frames = unwrapped_timecode - card->last_timecode - 1;
242 card->last_timecode = unwrapped_timecode;
244 // Convert the audio to stereo fp32 and add it.
245 size_t num_samples = (audio_frame.len >= audio_offset) ? (audio_frame.len - audio_offset) / 8 / 3 : 0;
247 audio.resize(num_samples * 2);
248 convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, 8, num_samples);
252 unique_lock<mutex> lock(card->audio_mutex);
254 int unwrapped_timecode = timecode;
255 if (dropped_frames > FPS * 2) {
256 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around), resetting resampler\n",
258 card->resampling_queue.reset(new ResamplingQueue(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
259 } else if (dropped_frames > 0) {
260 // Insert silence as needed.
261 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
262 card_index, dropped_frames, timecode);
263 vector<float> silence;
264 silence.resize((OUTPUT_FREQUENCY / FPS) * 2);
265 for (int i = 0; i < dropped_frames; ++i) {
266 card->resampling_queue->add_input_samples((unwrapped_timecode - dropped_frames + i) / double(FPS), silence.data(), (OUTPUT_FREQUENCY / FPS));
269 card->resampling_queue->add_input_samples(unwrapped_timecode / double(FPS), audio.data(), num_samples);
272 // Done with the audio, so release it.
273 if (audio_frame.owner) {
274 audio_frame.owner->release_frame(audio_frame);
278 // Wait until the previous frame was consumed.
279 unique_lock<mutex> lock(bmusb_mutex);
280 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
281 if (card->should_quit) return;
284 if (video_frame.len - video_offset != WIDTH * (HEIGHT+EXTRAHEIGHT) * 2) {
285 if (video_frame.len != 0) {
286 printf("Card %d: Dropping video frame with wrong length (%ld)\n",
287 card_index, video_frame.len - video_offset);
289 if (video_frame.owner) {
290 video_frame.owner->release_frame(video_frame);
293 // Still send on the information that we _had_ a frame, even though it's corrupted,
294 // so that pts can go up accordingly.
296 unique_lock<mutex> lock(bmusb_mutex);
297 card->new_data_ready = true;
298 card->new_frame = RefCountedFrame(FrameAllocator::Frame());
299 card->new_data_ready_fence = nullptr;
300 card->dropped_frames = dropped_frames;
301 card->new_data_ready_changed.notify_all();
306 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
307 GLuint pbo = userdata->pbo;
309 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
311 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
313 //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
316 // Upload the textures.
317 glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
319 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));
321 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
323 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, WIDTH/2, HEIGHT, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(WIDTH * 25 + 22));
325 glBindTexture(GL_TEXTURE_2D, 0);
327 GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
329 assert(fence != nullptr);
332 unique_lock<mutex> lock(bmusb_mutex);
333 card->new_data_ready = true;
334 card->new_frame = RefCountedFrame(video_frame);
335 card->new_data_ready_fence = fence;
336 card->dropped_frames = dropped_frames;
337 card->new_data_ready_changed.notify_all();
341 void Mixer::thread_func()
343 eglBindAPI(EGL_OPENGL_API);
344 QOpenGLContext *context = create_context(mixer_surface);
345 if (!make_current(context, mixer_surface)) {
350 struct timespec start, now;
351 clock_gettime(CLOCK_MONOTONIC, &start);
354 int dropped_frames = 0;
356 while (!should_quit) {
357 CaptureCard card_copy[MAX_CARDS];
360 unique_lock<mutex> lock(bmusb_mutex);
362 // The first card is the master timer, so wait for it to have a new frame.
363 // TODO: Make configurable, and with a timeout.
364 cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
366 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
367 CaptureCard *card = &cards[card_index];
368 card_copy[card_index].usb = card->usb;
369 card_copy[card_index].new_data_ready = card->new_data_ready;
370 card_copy[card_index].new_frame = card->new_frame;
371 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
372 card_copy[card_index].dropped_frames = card->dropped_frames;
373 card->new_data_ready = false;
374 card->new_data_ready_changed.notify_all();
378 // Resample the audio as needed, including from previously dropped frames.
379 for (unsigned frame_num = 0; frame_num < card_copy[0].dropped_frames + 1; ++frame_num) {
381 // Signal to the audio thread to process this frame.
382 unique_lock<mutex> lock(audio_mutex);
383 audio_pts_queue.push(pts_int);
384 audio_pts_queue_changed.notify_one();
386 if (frame_num != card_copy[0].dropped_frames) {
387 // For dropped frames, increase the pts.
389 pts_int += TIMEBASE / FPS;
393 if (audio_level_callback != nullptr) {
394 double loudness_s = r128.loudness_S();
395 double loudness_i = r128.integrated();
396 double loudness_range_low = r128.range_min();
397 double loudness_range_high = r128.range_max();
399 audio_level_callback(loudness_s, 20.0 * log10(peak),
400 loudness_i, loudness_range_low, loudness_range_high,
401 last_gain_staging_db);
404 for (unsigned card_index = 1; card_index < num_cards; ++card_index) {
405 if (card_copy[card_index].new_data_ready && card_copy[card_index].new_frame->len == 0) {
406 ++card_copy[card_index].dropped_frames;
408 if (card_copy[card_index].dropped_frames > 0) {
409 printf("Card %u dropped %d frames before this\n",
410 card_index, int(card_copy[card_index].dropped_frames));
414 // If the first card is reporting a corrupted or otherwise dropped frame,
415 // just increase the pts (skipping over this frame) and don't try to compute anything new.
416 if (card_copy[0].new_frame->len == 0) {
418 pts_int += TIMEBASE / FPS;
422 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
423 CaptureCard *card = &card_copy[card_index];
424 if (!card->new_data_ready || card->new_frame->len == 0)
427 assert(card->new_frame != nullptr);
428 bmusb_current_rendering_frame[card_index] = card->new_frame;
431 // The new texture might still be uploaded,
432 // tell the GPU to wait until it's there.
433 if (card->new_data_ready_fence) {
434 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
436 glDeleteSync(card->new_data_ready_fence);
439 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
440 theme->set_input_textures(card_index, userdata->tex_y, userdata->tex_cbcr);
443 // Get the main chain from the theme, and set its state immediately.
444 pair<EffectChain *, function<void()>> theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT);
445 EffectChain *chain = theme_main_chain.first;
446 theme_main_chain.second();
448 GLuint y_tex, cbcr_tex;
449 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
452 // Render main chain.
453 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
454 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
455 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
457 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
458 resource_pool->release_fbo(fbo);
460 subsample_chroma(cbcr_full_tex, cbcr_tex);
461 resource_pool->release_2d_texture(cbcr_full_tex);
463 // Set the right state for rgba_tex.
464 glBindFramebuffer(GL_FRAMEBUFFER, 0);
465 glBindTexture(GL_TEXTURE_2D, rgba_tex);
466 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
467 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
468 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
470 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
473 // Make sure the H.264 gets a reference to all the
474 // input frames needed, so that they are not released back
475 // until the rendering is done.
476 vector<RefCountedFrame> input_frames;
477 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
478 input_frames.push_back(bmusb_current_rendering_frame[card_index]);
480 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
481 h264_encoder->end_frame(fence, pts_int + av_delay, input_frames);
483 pts_int += TIMEBASE / FPS;
485 // The live frame just shows the RGBA texture we just rendered.
486 // It owns rgba_tex now.
487 DisplayFrame live_frame;
488 live_frame.chain = display_chain.get();
489 live_frame.setup_chain = [this, rgba_tex]{
490 display_input->set_texture_num(rgba_tex);
492 live_frame.ready_fence = fence;
493 live_frame.input_frames = {};
494 live_frame.temp_textures = { rgba_tex };
495 output_channel[OUTPUT_LIVE].output_frame(live_frame);
497 // Set up preview and any additional channels.
498 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
499 DisplayFrame display_frame;
500 pair<EffectChain *, function<void()>> chain = theme->get_chain(i, pts(), WIDTH, HEIGHT); // FIXME: dimensions
501 display_frame.chain = chain.first;
502 display_frame.setup_chain = chain.second;
503 display_frame.ready_fence = fence;
505 // FIXME: possible to do better?
506 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
507 display_frame.input_frames.push_back(bmusb_current_rendering_frame[card_index]);
509 display_frame.temp_textures = {};
510 output_channel[i].output_frame(display_frame);
513 clock_gettime(CLOCK_MONOTONIC, &now);
514 double elapsed = now.tv_sec - start.tv_sec +
515 1e-9 * (now.tv_nsec - start.tv_nsec);
516 if (frame % 100 == 0) {
517 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
518 frame, dropped_frames, elapsed, frame / elapsed,
519 1e3 * elapsed / frame);
520 // chain->print_phase_timing();
524 // Reset every 100 frames, so that local variations in frame times
525 // (especially for the first few frames, when the shaders are
526 // compiled etc.) don't make it hard to measure for the entire
527 // remaining duration of the program.
528 if (frame == 10000) {
536 resource_pool->clean_context();
539 void Mixer::audio_thread_func()
541 while (!should_quit) {
542 int64_t frame_pts_int;
545 unique_lock<mutex> lock(audio_mutex);
546 audio_pts_queue_changed.wait(lock, [this]{ return !audio_pts_queue.empty(); });
547 frame_pts_int = audio_pts_queue.front();
548 audio_pts_queue.pop();
551 process_audio_one_frame(frame_pts_int);
555 void Mixer::process_audio_one_frame(int64_t frame_pts_int)
557 vector<float> samples_card;
558 vector<float> samples_out;
559 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
560 samples_card.resize((OUTPUT_FREQUENCY / FPS) * 2);
562 unique_lock<mutex> lock(cards[card_index].audio_mutex);
563 if (!cards[card_index].resampling_queue->get_output_samples(double(frame_pts_int) / TIMEBASE, &samples_card[0], OUTPUT_FREQUENCY / FPS)) {
564 printf("Card %d reported previous underrun.\n", card_index);
567 // TODO: Allow using audio from the other card(s) as well.
568 if (card_index == 0) {
569 samples_out = move(samples_card);
573 // Cut away everything under 120 Hz (or whatever the cutoff is);
574 // we don't need it for voice, and it will reduce headroom
575 // and confuse the compressor. (In particular, any hums at 50 or 60 Hz
576 // should be dampened.)
577 locut.render(samples_out.data(), samples_out.size() / 2, locut_cutoff_hz * 2.0 * M_PI / OUTPUT_FREQUENCY, 0.5f);
579 // Apply a level compressor to get the general level right.
580 // Basically, if it's over about -40 dBFS, we squeeze it down to that level
581 // (or more precisely, near it, since we don't use infinite ratio),
582 // then apply a makeup gain to get it to -14 dBFS. -14 dBFS is, of course,
583 // entirely arbitrary, but from practical tests with speech, it seems to
584 // put ut around -23 LUFS, so it's a reasonable starting point for later use.
585 float ref_level_dbfs = -14.0f;
587 float threshold = 0.01f; // -40 dBFS.
589 float attack_time = 0.5f;
590 float release_time = 20.0f;
591 float makeup_gain = pow(10.0f, (ref_level_dbfs - (-40.0f)) / 20.0f); // +26 dB.
592 level_compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
593 last_gain_staging_db = 20.0 * log10(level_compressor.get_attenuation() * makeup_gain);
597 printf("level=%f (%+5.2f dBFS) attenuation=%f (%+5.2f dB) end_result=%+5.2f dB\n",
598 level_compressor.get_level(), 20.0 * log10(level_compressor.get_level()),
599 level_compressor.get_attenuation(), 20.0 * log10(level_compressor.get_attenuation()),
600 20.0 * log10(level_compressor.get_level() * level_compressor.get_attenuation() * makeup_gain));
603 // float limiter_att, compressor_att;
605 // The real compressor.
606 if (compressor_enabled) {
607 float threshold = pow(10.0f, compressor_threshold_dbfs / 20.0f);
609 float attack_time = 0.005f;
610 float release_time = 0.040f;
611 float makeup_gain = 2.0f; // +6 dB.
612 compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
613 // compressor_att = compressor.get_attenuation();
616 // Finally a limiter at -4 dB (so, -10 dBFS) to take out the worst peaks only.
617 // Note that since ratio is not infinite, we could go slightly higher than this.
618 if (limiter_enabled) {
619 float threshold = pow(10.0f, limiter_threshold_dbfs / 20.0f);
621 float attack_time = 0.0f; // Instant.
622 float release_time = 0.020f;
623 float makeup_gain = 1.0f; // 0 dB.
624 limiter.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
625 // limiter_att = limiter.get_attenuation();
628 // printf("limiter=%+5.1f compressor=%+5.1f\n", 20.0*log10(limiter_att), 20.0*log10(compressor_att));
630 // Upsample 4x to find interpolated peak.
631 peak_resampler.inp_data = samples_out.data();
632 peak_resampler.inp_count = samples_out.size() / 2;
634 vector<float> interpolated_samples_out;
635 interpolated_samples_out.resize(samples_out.size());
636 while (peak_resampler.inp_count > 0) { // About four iterations.
637 peak_resampler.out_data = &interpolated_samples_out[0];
638 peak_resampler.out_count = interpolated_samples_out.size() / 2;
639 peak_resampler.process();
640 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
641 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
645 vector<float> left, right;
646 deinterleave_samples(samples_out, &left, &right);
647 float *ptrs[] = { left.data(), right.data() };
648 r128.process(left.size(), ptrs);
650 // Send the samples to the sound card.
652 alsa->write(samples_out);
655 // And finally add them to the output.
656 h264_encoder->add_audio(frame_pts_int, move(samples_out));
659 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
662 glGenVertexArrays(1, &vao);
671 glBindVertexArray(vao);
675 GLuint fbo = resource_pool->create_fbo(dst_tex);
676 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
677 glViewport(0, 0, WIDTH/2, HEIGHT/2);
680 glUseProgram(cbcr_program_num);
683 glActiveTexture(GL_TEXTURE0);
685 glBindTexture(GL_TEXTURE_2D, src_tex);
687 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
689 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
691 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
694 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
695 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
697 GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
698 GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices); // Same as vertices.
700 glDrawArrays(GL_TRIANGLES, 0, 3);
703 cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
704 cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
709 resource_pool->release_fbo(fbo);
710 glDeleteVertexArrays(1, &vao);
713 void Mixer::release_display_frame(DisplayFrame *frame)
715 for (GLuint texnum : frame->temp_textures) {
716 resource_pool->release_2d_texture(texnum);
718 frame->temp_textures.clear();
719 frame->ready_fence.reset();
720 frame->input_frames.clear();
725 mixer_thread = thread(&Mixer::thread_func, this);
726 audio_thread = thread(&Mixer::audio_thread_func, this);
736 void Mixer::transition_clicked(int transition_num)
738 theme->transition_clicked(transition_num, pts());
741 void Mixer::channel_clicked(int preview_num)
743 theme->channel_clicked(preview_num);
746 void Mixer::reset_meters()
748 peak_resampler.reset();
754 Mixer::OutputChannel::~OutputChannel()
756 if (has_current_frame) {
757 parent->release_display_frame(¤t_frame);
759 if (has_ready_frame) {
760 parent->release_display_frame(&ready_frame);
764 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
766 // Store this frame for display. Remove the ready frame if any
767 // (it was seemingly never used).
769 unique_lock<mutex> lock(frame_mutex);
770 if (has_ready_frame) {
771 parent->release_display_frame(&ready_frame);
774 has_ready_frame = true;
777 if (has_new_frame_ready_callback) {
778 new_frame_ready_callback();
782 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
784 unique_lock<mutex> lock(frame_mutex);
785 if (!has_current_frame && !has_ready_frame) {
789 if (has_current_frame && has_ready_frame) {
790 // We have a new ready frame. Toss the current one.
791 parent->release_display_frame(¤t_frame);
792 has_current_frame = false;
794 if (has_ready_frame) {
795 assert(!has_current_frame);
796 current_frame = ready_frame;
797 ready_frame.ready_fence.reset(); // Drop the refcount.
798 ready_frame.input_frames.clear(); // Drop the refcounts.
799 has_current_frame = true;
800 has_ready_frame = false;
803 *frame = current_frame;
807 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
809 new_frame_ready_callback = callback;
810 has_new_frame_ready_callback = true;