10 #include <epoxy/egl.h>
12 #include <movit/effect_chain.h>
13 #include <movit/effect_util.h>
14 #include <movit/flat_input.h>
15 #include <movit/image_format.h>
16 #include <movit/resource_pool.h>
25 #include <condition_variable>
34 #include "bmusb/bmusb.h"
37 #include "h264encode.h"
38 #include "pbo_frame_allocator.h"
39 #include "ref_counted_gl_sync.h"
44 using namespace movit;
46 using namespace std::placeholders;
48 Mixer *global_mixer = nullptr;
52 void convert_fixed24_to_fp32(float *dst, size_t out_channels, const uint8_t *src, size_t in_channels, size_t num_samples)
54 for (size_t i = 0; i < num_samples; ++i) {
55 for (size_t j = 0; j < out_channels; ++j) {
59 uint32_t s = s1 | (s1 << 8) | (s2 << 16) | (s3 << 24);
60 dst[i * out_channels + j] = int(s) * (1.0f / 4294967296.0f);
62 src += 3 * (in_channels - out_channels);
68 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
69 : httpd(LOCAL_DUMP_FILE_NAME, WIDTH, HEIGHT),
71 mixer_surface(create_surface(format)),
72 h264_encoder_surface(create_surface(format)),
73 level_compressor(OUTPUT_FREQUENCY),
74 limiter(OUTPUT_FREQUENCY),
75 compressor(OUTPUT_FREQUENCY)
79 CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
82 // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
83 // will be halved when sampling them, and we need to compensate here.
84 movit_texel_subpixel_precision /= 2.0;
86 resource_pool.reset(new ResourcePool);
87 theme.reset(new Theme("theme.lua", resource_pool.get(), num_cards));
88 for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
89 output_channel[i].parent = this;
92 ImageFormat inout_format;
93 inout_format.color_space = COLORSPACE_sRGB;
94 inout_format.gamma_curve = GAMMA_sRGB;
96 // Display chain; shows the live output produced by the main chain (its RGBA version).
97 display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
99 display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT); // FIXME: GL_UNSIGNED_BYTE is really wrong.
100 display_chain->add_input(display_input);
101 display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
102 display_chain->set_dither_bits(0); // Don't bother.
103 display_chain->finalize();
105 h264_encoder.reset(new H264Encoder(h264_encoder_surface, WIDTH, HEIGHT, &httpd));
107 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
108 printf("Configuring card %d...\n", card_index);
109 CaptureCard *card = &cards[card_index];
110 card->usb = new BMUSBCapture(card_index);
111 card->usb->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
112 card->frame_allocator.reset(new PBOFrameAllocator(WIDTH * (HEIGHT+EXTRAHEIGHT) * 2 + 44, WIDTH, HEIGHT));
113 card->usb->set_video_frame_allocator(card->frame_allocator.get());
114 card->surface = create_surface(format);
115 card->usb->set_dequeue_thread_callbacks(
117 eglBindAPI(EGL_OPENGL_API);
118 card->context = create_context(card->surface);
119 if (!make_current(card->context, card->surface)) {
120 printf("failed to create bmusb context\n");
125 resource_pool->clean_context();
127 card->resampling_queue.reset(new ResamplingQueue(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
128 card->usb->configure_card();
131 BMUSBCapture::start_bm_thread();
133 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
134 cards[card_index].usb->start_bm_capture();
137 //chain->enable_phase_timing(true);
139 // Set up stuff for NV12 conversion.
142 string cbcr_vert_shader = read_file("vs-cbcr.130.vert");
143 string cbcr_frag_shader =
146 "uniform sampler2D cbcr_tex; \n"
148 " gl_FragColor = texture2D(cbcr_tex, tc0); \n"
150 cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader);
152 r128.init(2, OUTPUT_FREQUENCY);
155 locut.init(FILTER_HPF, 2);
157 // hlen=16 is pretty low quality, but we use quite a bit of CPU otherwise,
158 // and there's a limit to how important the peak meter is.
159 peak_resampler.setup(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY * 4, /*num_channels=*/2, /*hlen=*/16);
161 alsa.reset(new ALSAOutput(OUTPUT_FREQUENCY, /*num_channels=*/2));
166 resource_pool->release_glsl_program(cbcr_program_num);
167 BMUSBCapture::stop_bm_thread();
169 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
171 unique_lock<mutex> lock(bmusb_mutex);
172 cards[card_index].should_quit = true; // Unblock thread.
173 cards[card_index].new_data_ready_changed.notify_all();
175 cards[card_index].usb->stop_dequeue_thread();
178 h264_encoder.reset(nullptr);
183 int unwrap_timecode(uint16_t current_wrapped, int last)
185 uint16_t last_wrapped = last & 0xffff;
186 if (current_wrapped > last_wrapped) {
187 return (last & ~0xffff) | current_wrapped;
189 return 0x10000 + ((last & ~0xffff) | current_wrapped);
193 float find_peak(const float *samples, size_t num_samples)
195 float m = fabs(samples[0]);
196 for (size_t i = 1; i < num_samples; ++i) {
197 m = std::max(m, fabs(samples[i]));
202 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
204 size_t num_samples = in.size() / 2;
205 out_l->resize(num_samples);
206 out_r->resize(num_samples);
208 const float *inptr = in.data();
209 float *lptr = &(*out_l)[0];
210 float *rptr = &(*out_r)[0];
211 for (size_t i = 0; i < num_samples; ++i) {
219 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
220 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
221 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
223 CaptureCard *card = &cards[card_index];
225 if (audio_frame.len - audio_offset > 30000) {
226 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",
227 card_index, int(audio_frame.len), int(audio_offset),
228 timecode, int(video_frame.len), int(video_offset), video_format);
229 if (video_frame.owner) {
230 video_frame.owner->release_frame(video_frame);
232 if (audio_frame.owner) {
233 audio_frame.owner->release_frame(audio_frame);
238 int unwrapped_timecode = timecode;
239 int dropped_frames = 0;
240 if (card->last_timecode != -1) {
241 unwrapped_timecode = unwrap_timecode(unwrapped_timecode, card->last_timecode);
242 dropped_frames = unwrapped_timecode - card->last_timecode - 1;
244 card->last_timecode = unwrapped_timecode;
246 // Convert the audio to stereo fp32 and add it.
247 size_t num_samples = (audio_frame.len >= audio_offset) ? (audio_frame.len - audio_offset) / 8 / 3 : 0;
249 audio.resize(num_samples * 2);
250 convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, 8, num_samples);
254 unique_lock<mutex> lock(card->audio_mutex);
256 int unwrapped_timecode = timecode;
257 if (dropped_frames > FPS * 2) {
258 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around), resetting resampler\n",
260 card->resampling_queue.reset(new ResamplingQueue(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
261 } else if (dropped_frames > 0) {
262 // Insert silence as needed.
263 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
264 card_index, dropped_frames, timecode);
265 vector<float> silence;
266 silence.resize((OUTPUT_FREQUENCY / FPS) * 2);
267 for (int i = 0; i < dropped_frames; ++i) {
268 card->resampling_queue->add_input_samples((unwrapped_timecode - dropped_frames + i) / double(FPS), silence.data(), (OUTPUT_FREQUENCY / FPS));
271 card->resampling_queue->add_input_samples(unwrapped_timecode / double(FPS), audio.data(), num_samples);
274 // Done with the audio, so release it.
275 if (audio_frame.owner) {
276 audio_frame.owner->release_frame(audio_frame);
280 // Wait until the previous frame was consumed.
281 unique_lock<mutex> lock(bmusb_mutex);
282 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
283 if (card->should_quit) return;
286 if (video_frame.len - video_offset != WIDTH * (HEIGHT+EXTRAHEIGHT) * 2) {
287 if (video_frame.len != 0) {
288 printf("Card %d: Dropping video frame with wrong length (%ld)\n",
289 card_index, video_frame.len - video_offset);
291 if (video_frame.owner) {
292 video_frame.owner->release_frame(video_frame);
295 // Still send on the information that we _had_ a frame, even though it's corrupted,
296 // so that pts can go up accordingly.
298 unique_lock<mutex> lock(bmusb_mutex);
299 card->new_data_ready = true;
300 card->new_frame = RefCountedFrame(FrameAllocator::Frame());
301 card->new_data_ready_fence = nullptr;
302 card->dropped_frames = dropped_frames;
303 card->new_data_ready_changed.notify_all();
308 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
309 GLuint pbo = userdata->pbo;
311 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
313 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
315 //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
318 // Upload the textures.
319 glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
321 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));
323 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
325 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, WIDTH/2, HEIGHT, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(WIDTH * 25 + 22));
327 glBindTexture(GL_TEXTURE_2D, 0);
329 GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
331 assert(fence != nullptr);
334 unique_lock<mutex> lock(bmusb_mutex);
335 card->new_data_ready = true;
336 card->new_frame = RefCountedFrame(video_frame);
337 card->new_data_ready_fence = fence;
338 card->dropped_frames = dropped_frames;
339 card->new_data_ready_changed.notify_all();
343 void Mixer::thread_func()
345 eglBindAPI(EGL_OPENGL_API);
346 QOpenGLContext *context = create_context(mixer_surface);
347 if (!make_current(context, mixer_surface)) {
352 struct timespec start, now;
353 clock_gettime(CLOCK_MONOTONIC, &start);
356 int dropped_frames = 0;
358 while (!should_quit) {
359 CaptureCard card_copy[MAX_CARDS];
362 unique_lock<mutex> lock(bmusb_mutex);
364 // The first card is the master timer, so wait for it to have a new frame.
365 // TODO: Make configurable, and with a timeout.
366 cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
368 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
369 CaptureCard *card = &cards[card_index];
370 card_copy[card_index].usb = card->usb;
371 card_copy[card_index].new_data_ready = card->new_data_ready;
372 card_copy[card_index].new_frame = card->new_frame;
373 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
374 card_copy[card_index].dropped_frames = card->dropped_frames;
375 card->new_data_ready = false;
376 card->new_data_ready_changed.notify_all();
380 // Resample the audio as needed, including from previously dropped frames.
381 for (unsigned frame_num = 0; frame_num < card_copy[0].dropped_frames + 1; ++frame_num) {
383 // Signal to the audio thread to process this frame.
384 unique_lock<mutex> lock(audio_mutex);
385 audio_pts_queue.push(pts_int);
386 audio_pts_queue_changed.notify_one();
388 if (frame_num != card_copy[0].dropped_frames) {
389 // For dropped frames, increase the pts.
391 pts_int += TIMEBASE / FPS;
395 if (audio_level_callback != nullptr) {
396 double loudness_s = r128.loudness_S();
397 double loudness_i = r128.integrated();
398 double loudness_range_low = r128.range_min();
399 double loudness_range_high = r128.range_max();
401 audio_level_callback(loudness_s, 20.0 * log10(peak),
402 loudness_i, loudness_range_low, loudness_range_high,
403 last_gain_staging_db);
406 for (unsigned card_index = 1; card_index < num_cards; ++card_index) {
407 if (card_copy[card_index].new_data_ready && card_copy[card_index].new_frame->len == 0) {
408 ++card_copy[card_index].dropped_frames;
410 if (card_copy[card_index].dropped_frames > 0) {
411 printf("Card %u dropped %d frames before this\n",
412 card_index, int(card_copy[card_index].dropped_frames));
416 // If the first card is reporting a corrupted or otherwise dropped frame,
417 // just increase the pts (skipping over this frame) and don't try to compute anything new.
418 if (card_copy[0].new_frame->len == 0) {
420 pts_int += TIMEBASE / FPS;
424 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
425 CaptureCard *card = &card_copy[card_index];
426 if (!card->new_data_ready || card->new_frame->len == 0)
429 assert(card->new_frame != nullptr);
430 bmusb_current_rendering_frame[card_index] = card->new_frame;
433 // The new texture might still be uploaded,
434 // tell the GPU to wait until it's there.
435 if (card->new_data_ready_fence) {
436 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
438 glDeleteSync(card->new_data_ready_fence);
441 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
442 theme->set_input_textures(card_index, userdata->tex_y, userdata->tex_cbcr);
445 // Get the main chain from the theme, and set its state immediately.
446 pair<EffectChain *, function<void()>> theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT);
447 EffectChain *chain = theme_main_chain.first;
448 theme_main_chain.second();
450 GLuint y_tex, cbcr_tex;
451 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
454 // Render main chain.
455 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
456 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
457 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
459 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
460 resource_pool->release_fbo(fbo);
462 subsample_chroma(cbcr_full_tex, cbcr_tex);
463 resource_pool->release_2d_texture(cbcr_full_tex);
465 // Set the right state for rgba_tex.
466 glBindFramebuffer(GL_FRAMEBUFFER, 0);
467 glBindTexture(GL_TEXTURE_2D, rgba_tex);
468 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
469 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
470 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
472 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
475 // Make sure the H.264 gets a reference to all the
476 // input frames needed, so that they are not released back
477 // until the rendering is done.
478 vector<RefCountedFrame> input_frames;
479 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
480 input_frames.push_back(bmusb_current_rendering_frame[card_index]);
482 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
483 h264_encoder->end_frame(fence, pts_int + av_delay, input_frames);
485 pts_int += TIMEBASE / FPS;
487 // The live frame just shows the RGBA texture we just rendered.
488 // It owns rgba_tex now.
489 DisplayFrame live_frame;
490 live_frame.chain = display_chain.get();
491 live_frame.setup_chain = [this, rgba_tex]{
492 display_input->set_texture_num(rgba_tex);
494 live_frame.ready_fence = fence;
495 live_frame.input_frames = {};
496 live_frame.temp_textures = { rgba_tex };
497 output_channel[OUTPUT_LIVE].output_frame(live_frame);
499 // Set up preview and any additional channels.
500 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
501 DisplayFrame display_frame;
502 pair<EffectChain *, function<void()>> chain = theme->get_chain(i, pts(), WIDTH, HEIGHT); // FIXME: dimensions
503 display_frame.chain = chain.first;
504 display_frame.setup_chain = chain.second;
505 display_frame.ready_fence = fence;
507 // FIXME: possible to do better?
508 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
509 display_frame.input_frames.push_back(bmusb_current_rendering_frame[card_index]);
511 display_frame.temp_textures = {};
512 output_channel[i].output_frame(display_frame);
515 clock_gettime(CLOCK_MONOTONIC, &now);
516 double elapsed = now.tv_sec - start.tv_sec +
517 1e-9 * (now.tv_nsec - start.tv_nsec);
518 if (frame % 100 == 0) {
519 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
520 frame, dropped_frames, elapsed, frame / elapsed,
521 1e3 * elapsed / frame);
522 // chain->print_phase_timing();
526 // Reset every 100 frames, so that local variations in frame times
527 // (especially for the first few frames, when the shaders are
528 // compiled etc.) don't make it hard to measure for the entire
529 // remaining duration of the program.
530 if (frame == 10000) {
538 resource_pool->clean_context();
541 void Mixer::audio_thread_func()
543 while (!should_quit) {
544 int64_t frame_pts_int;
547 unique_lock<mutex> lock(audio_mutex);
548 audio_pts_queue_changed.wait(lock, [this]{ return !audio_pts_queue.empty(); });
549 frame_pts_int = audio_pts_queue.front();
550 audio_pts_queue.pop();
553 process_audio_one_frame(frame_pts_int);
557 void Mixer::process_audio_one_frame(int64_t frame_pts_int)
559 vector<float> samples_card;
560 vector<float> samples_out;
561 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
562 samples_card.resize((OUTPUT_FREQUENCY / FPS) * 2);
564 unique_lock<mutex> lock(cards[card_index].audio_mutex);
565 if (!cards[card_index].resampling_queue->get_output_samples(double(frame_pts_int) / TIMEBASE, &samples_card[0], OUTPUT_FREQUENCY / FPS)) {
566 printf("Card %d reported previous underrun.\n", card_index);
569 // TODO: Allow using audio from the other card(s) as well.
570 if (card_index == 0) {
571 samples_out = move(samples_card);
575 // Cut away everything under 150 Hz; we don't need it for voice,
576 // and it will reduce headroom and confuse the compressor.
577 // (In particular, any hums at 50 or 60 Hz should be dampened.)
578 locut.render(samples_out.data(), samples_out.size() / 2, locut_cutoff_hz * 2.0 * M_PI / OUTPUT_FREQUENCY, 0.5f);
580 // Apply a level compressor to get the general level right.
581 // Basically, if it's over about -40 dBFS, we squeeze it down to that level
582 // (or more precisely, near it, since we don't use infinite ratio),
583 // then apply a makeup gain to get it to -14 dBFS. -14 dBFS is, of course,
584 // entirely arbitrary, but from practical tests with speech, it seems to
585 // put ut around -23 LUFS, so it's a reasonable starting point for later use.
586 float ref_level_dbfs = -14.0f;
588 float threshold = 0.01f; // -40 dBFS.
590 float attack_time = 0.5f;
591 float release_time = 20.0f;
592 float makeup_gain = pow(10.0f, (ref_level_dbfs - (-40.0f)) / 20.0f); // +26 dB.
593 level_compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
594 last_gain_staging_db = 20.0 * log10(level_compressor.get_attenuation() * makeup_gain);
598 printf("level=%f (%+5.2f dBFS) attenuation=%f (%+5.2f dB) end_result=%+5.2f dB\n",
599 level_compressor.get_level(), 20.0 * log10(level_compressor.get_level()),
600 level_compressor.get_attenuation(), 20.0 * log10(level_compressor.get_attenuation()),
601 20.0 * log10(level_compressor.get_level() * level_compressor.get_attenuation() * makeup_gain));
604 // float limiter_att, compressor_att;
606 // The real compressor.
607 if (compressor_enabled) {
608 float threshold = pow(10.0f, compressor_threshold_dbfs / 20.0f);
610 float attack_time = 0.005f;
611 float release_time = 0.040f;
612 float makeup_gain = 2.0f; // +6 dB.
613 compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
614 // compressor_att = compressor.get_attenuation();
617 // Finally a limiter at -4 dB (so, -10 dBFS) to take out the worst peaks only.
618 // Note that since ratio is not infinite, we could go slightly higher than this.
619 if (limiter_enabled) {
620 float threshold = pow(10.0f, limiter_threshold_dbfs / 20.0f);
622 float attack_time = 0.0f; // Instant.
623 float release_time = 0.020f;
624 float makeup_gain = 1.0f; // 0 dB.
625 limiter.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
626 // limiter_att = limiter.get_attenuation();
629 // printf("limiter=%+5.1f compressor=%+5.1f\n", 20.0*log10(limiter_att), 20.0*log10(compressor_att));
631 // Upsample 4x to find interpolated peak.
632 peak_resampler.inp_data = samples_out.data();
633 peak_resampler.inp_count = samples_out.size() / 2;
635 vector<float> interpolated_samples_out;
636 interpolated_samples_out.resize(samples_out.size());
637 while (peak_resampler.inp_count > 0) { // About four iterations.
638 peak_resampler.out_data = &interpolated_samples_out[0];
639 peak_resampler.out_count = interpolated_samples_out.size() / 2;
640 peak_resampler.process();
641 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
642 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
646 vector<float> left, right;
647 deinterleave_samples(samples_out, &left, &right);
648 float *ptrs[] = { left.data(), right.data() };
649 r128.process(left.size(), ptrs);
651 // Send the samples to the sound card.
653 alsa->write(samples_out);
656 // And finally add them to the output.
657 h264_encoder->add_audio(frame_pts_int, move(samples_out));
660 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
663 glGenVertexArrays(1, &vao);
672 glBindVertexArray(vao);
676 GLuint fbo = resource_pool->create_fbo(dst_tex);
677 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
678 glViewport(0, 0, WIDTH/2, HEIGHT/2);
681 glUseProgram(cbcr_program_num);
684 glActiveTexture(GL_TEXTURE0);
686 glBindTexture(GL_TEXTURE_2D, src_tex);
688 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
690 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
692 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
695 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
696 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
698 GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
699 GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices); // Same as vertices.
701 glDrawArrays(GL_TRIANGLES, 0, 3);
704 cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
705 cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
710 resource_pool->release_fbo(fbo);
711 glDeleteVertexArrays(1, &vao);
714 void Mixer::release_display_frame(DisplayFrame *frame)
716 for (GLuint texnum : frame->temp_textures) {
717 resource_pool->release_2d_texture(texnum);
719 frame->temp_textures.clear();
720 frame->ready_fence.reset();
721 frame->input_frames.clear();
726 mixer_thread = thread(&Mixer::thread_func, this);
727 audio_thread = thread(&Mixer::audio_thread_func, this);
737 void Mixer::transition_clicked(int transition_num)
739 theme->transition_clicked(transition_num, pts());
742 void Mixer::channel_clicked(int preview_num)
744 theme->channel_clicked(preview_num);
747 void Mixer::reset_meters()
749 peak_resampler.reset();
755 Mixer::OutputChannel::~OutputChannel()
757 if (has_current_frame) {
758 parent->release_display_frame(¤t_frame);
760 if (has_ready_frame) {
761 parent->release_display_frame(&ready_frame);
765 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
767 // Store this frame for display. Remove the ready frame if any
768 // (it was seemingly never used).
770 unique_lock<mutex> lock(frame_mutex);
771 if (has_ready_frame) {
772 parent->release_display_frame(&ready_frame);
775 has_ready_frame = true;
778 if (has_new_frame_ready_callback) {
779 new_frame_ready_callback();
783 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
785 unique_lock<mutex> lock(frame_mutex);
786 if (!has_current_frame && !has_ready_frame) {
790 if (has_current_frame && has_ready_frame) {
791 // We have a new ready frame. Toss the current one.
792 parent->release_display_frame(¤t_frame);
793 has_current_frame = false;
795 if (has_ready_frame) {
796 assert(!has_current_frame);
797 current_frame = ready_frame;
798 ready_frame.ready_fence.reset(); // Drop the refcount.
799 ready_frame.input_frames.clear(); // Drop the refcounts.
800 has_current_frame = true;
801 has_ready_frame = false;
804 *frame = current_frame;
808 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
810 new_frame_ready_callback = callback;
811 has_new_frame_ready_callback = true;