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();
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) {
380 process_audio_one_frame();
381 if (frame_num != card_copy[0].dropped_frames) {
382 // For dropped frames, increase the pts.
384 pts_int += TIMEBASE / FPS;
388 if (audio_level_callback != nullptr) {
389 double loudness_s = r128.loudness_S();
390 double loudness_i = r128.integrated();
391 double loudness_range_low = r128.range_min();
392 double loudness_range_high = r128.range_max();
394 audio_level_callback(loudness_s, 20.0 * log10(peak),
395 loudness_i, loudness_range_low, loudness_range_high,
396 last_gain_staging_db);
399 for (unsigned card_index = 1; card_index < num_cards; ++card_index) {
400 if (card_copy[card_index].new_data_ready && card_copy[card_index].new_frame->len == 0) {
401 ++card_copy[card_index].dropped_frames;
403 if (card_copy[card_index].dropped_frames > 0) {
404 printf("Card %u dropped %d frames before this\n",
405 card_index, int(card_copy[card_index].dropped_frames));
409 // If the first card is reporting a corrupted or otherwise dropped frame,
410 // just increase the pts (skipping over this frame) and don't try to compute anything new.
411 if (card_copy[0].new_frame->len == 0) {
413 pts_int += TIMEBASE / FPS;
417 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
418 CaptureCard *card = &card_copy[card_index];
419 if (!card->new_data_ready || card->new_frame->len == 0)
422 assert(card->new_frame != nullptr);
423 bmusb_current_rendering_frame[card_index] = card->new_frame;
426 // The new texture might still be uploaded,
427 // tell the GPU to wait until it's there.
428 if (card->new_data_ready_fence) {
429 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
431 glDeleteSync(card->new_data_ready_fence);
434 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
435 theme->set_input_textures(card_index, userdata->tex_y, userdata->tex_cbcr);
438 // Get the main chain from the theme, and set its state immediately.
439 pair<EffectChain *, function<void()>> theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT);
440 EffectChain *chain = theme_main_chain.first;
441 theme_main_chain.second();
443 GLuint y_tex, cbcr_tex;
444 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
447 // Render main chain.
448 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
449 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
450 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
452 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
453 resource_pool->release_fbo(fbo);
455 subsample_chroma(cbcr_full_tex, cbcr_tex);
456 resource_pool->release_2d_texture(cbcr_full_tex);
458 // Set the right state for rgba_tex.
459 glBindFramebuffer(GL_FRAMEBUFFER, 0);
460 glBindTexture(GL_TEXTURE_2D, rgba_tex);
461 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
462 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
463 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
465 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
468 // Make sure the H.264 gets a reference to all the
469 // input frames needed, so that they are not released back
470 // until the rendering is done.
471 vector<RefCountedFrame> input_frames;
472 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
473 input_frames.push_back(bmusb_current_rendering_frame[card_index]);
475 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampling_queue.h. TODO: Make less hard-coded.
476 h264_encoder->end_frame(fence, pts_int + av_delay, input_frames);
478 pts_int += TIMEBASE / FPS;
480 // The live frame just shows the RGBA texture we just rendered.
481 // It owns rgba_tex now.
482 DisplayFrame live_frame;
483 live_frame.chain = display_chain.get();
484 live_frame.setup_chain = [this, rgba_tex]{
485 display_input->set_texture_num(rgba_tex);
487 live_frame.ready_fence = fence;
488 live_frame.input_frames = {};
489 live_frame.temp_textures = { rgba_tex };
490 output_channel[OUTPUT_LIVE].output_frame(live_frame);
492 // Set up preview and any additional channels.
493 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
494 DisplayFrame display_frame;
495 pair<EffectChain *, function<void()>> chain = theme->get_chain(i, pts(), WIDTH, HEIGHT); // FIXME: dimensions
496 display_frame.chain = chain.first;
497 display_frame.setup_chain = chain.second;
498 display_frame.ready_fence = fence;
500 // FIXME: possible to do better?
501 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
502 display_frame.input_frames.push_back(bmusb_current_rendering_frame[card_index]);
504 display_frame.temp_textures = {};
505 output_channel[i].output_frame(display_frame);
508 clock_gettime(CLOCK_MONOTONIC, &now);
509 double elapsed = now.tv_sec - start.tv_sec +
510 1e-9 * (now.tv_nsec - start.tv_nsec);
511 if (frame % 100 == 0) {
512 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
513 frame, dropped_frames, elapsed, frame / elapsed,
514 1e3 * elapsed / frame);
515 // chain->print_phase_timing();
519 // Reset every 100 frames, so that local variations in frame times
520 // (especially for the first few frames, when the shaders are
521 // compiled etc.) don't make it hard to measure for the entire
522 // remaining duration of the program.
523 if (frame == 10000) {
531 resource_pool->clean_context();
534 void Mixer::process_audio_one_frame()
536 vector<float> samples_card;
537 vector<float> samples_out;
538 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
539 samples_card.resize((OUTPUT_FREQUENCY / FPS) * 2);
541 unique_lock<mutex> lock(cards[card_index].audio_mutex);
542 if (!cards[card_index].resampling_queue->get_output_samples(pts(), &samples_card[0], OUTPUT_FREQUENCY / FPS)) {
543 printf("Card %d reported previous underrun.\n", card_index);
546 // TODO: Allow using audio from the other card(s) as well.
547 if (card_index == 0) {
548 samples_out = move(samples_card);
552 // Cut away everything under 150 Hz; we don't need it for voice,
553 // and it will reduce headroom and confuse the compressor.
554 // (In particular, any hums at 50 or 60 Hz should be dampened.)
555 locut.render(samples_out.data(), samples_out.size() / 2, locut_cutoff_hz * 2.0 * M_PI / OUTPUT_FREQUENCY, 0.5f);
557 // Apply a level compressor to get the general level right.
558 // Basically, if it's over about -40 dBFS, we squeeze it down to that level
559 // (or more precisely, near it, since we don't use infinite ratio),
560 // then apply a makeup gain to get it to -14 dBFS. -14 dBFS is, of course,
561 // entirely arbitrary, but from practical tests with speech, it seems to
562 // put ut around -23 LUFS, so it's a reasonable starting point for later use.
563 float ref_level_dbfs = -14.0f;
565 float threshold = 0.01f; // -40 dBFS.
567 float attack_time = 0.5f;
568 float release_time = 20.0f;
569 float makeup_gain = pow(10.0f, (ref_level_dbfs - (-40.0f)) / 20.0f); // +26 dB.
570 level_compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
571 last_gain_staging_db = 20.0 * log10(level_compressor.get_attenuation() * makeup_gain);
575 printf("level=%f (%+5.2f dBFS) attenuation=%f (%+5.2f dB) end_result=%+5.2f dB\n",
576 level_compressor.get_level(), 20.0 * log10(level_compressor.get_level()),
577 level_compressor.get_attenuation(), 20.0 * log10(level_compressor.get_attenuation()),
578 20.0 * log10(level_compressor.get_level() * level_compressor.get_attenuation() * makeup_gain));
581 // float limiter_att, compressor_att;
583 // The real compressor.
584 if (compressor_enabled) {
585 float threshold = pow(10.0f, compressor_threshold_dbfs / 20.0f);
587 float attack_time = 0.005f;
588 float release_time = 0.040f;
589 float makeup_gain = 2.0f; // +6 dB.
590 compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
591 // compressor_att = compressor.get_attenuation();
594 // Finally a limiter at -4 dB (so, -10 dBFS) to take out the worst peaks only.
595 // Note that since ratio is not infinite, we could go slightly higher than this.
596 if (limiter_enabled) {
597 float threshold = pow(10.0f, limiter_threshold_dbfs / 20.0f);
599 float attack_time = 0.0f; // Instant.
600 float release_time = 0.020f;
601 float makeup_gain = 1.0f; // 0 dB.
602 limiter.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
603 // limiter_att = limiter.get_attenuation();
606 // printf("limiter=%+5.1f compressor=%+5.1f\n", 20.0*log10(limiter_att), 20.0*log10(compressor_att));
608 // Upsample 4x to find interpolated peak.
609 peak_resampler.inp_data = samples_out.data();
610 peak_resampler.inp_count = samples_out.size() / 2;
612 vector<float> interpolated_samples_out;
613 interpolated_samples_out.resize(samples_out.size());
614 while (peak_resampler.inp_count > 0) { // About four iterations.
615 peak_resampler.out_data = &interpolated_samples_out[0];
616 peak_resampler.out_count = interpolated_samples_out.size() / 2;
617 peak_resampler.process();
618 size_t out_stereo_samples = interpolated_samples_out.size() / 2 - peak_resampler.out_count;
619 peak = max<float>(peak, find_peak(interpolated_samples_out.data(), out_stereo_samples * 2));
623 vector<float> left, right;
624 deinterleave_samples(samples_out, &left, &right);
625 float *ptrs[] = { left.data(), right.data() };
626 r128.process(left.size(), ptrs);
628 // Send the samples to the sound card.
630 alsa->write(samples_out);
633 // And finally add them to the output.
634 h264_encoder->add_audio(pts_int, move(samples_out));
637 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
640 glGenVertexArrays(1, &vao);
649 glBindVertexArray(vao);
653 GLuint fbo = resource_pool->create_fbo(dst_tex);
654 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
655 glViewport(0, 0, WIDTH/2, HEIGHT/2);
658 glUseProgram(cbcr_program_num);
661 glActiveTexture(GL_TEXTURE0);
663 glBindTexture(GL_TEXTURE_2D, src_tex);
665 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
667 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
669 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
672 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
673 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
675 GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
676 GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices); // Same as vertices.
678 glDrawArrays(GL_TRIANGLES, 0, 3);
681 cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
682 cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
687 resource_pool->release_fbo(fbo);
688 glDeleteVertexArrays(1, &vao);
691 void Mixer::release_display_frame(DisplayFrame *frame)
693 for (GLuint texnum : frame->temp_textures) {
694 resource_pool->release_2d_texture(texnum);
696 frame->temp_textures.clear();
697 frame->ready_fence.reset();
698 frame->input_frames.clear();
703 mixer_thread = thread(&Mixer::thread_func, this);
712 void Mixer::transition_clicked(int transition_num)
714 theme->transition_clicked(transition_num, pts());
717 void Mixer::channel_clicked(int preview_num)
719 theme->channel_clicked(preview_num);
722 void Mixer::reset_meters()
724 peak_resampler.reset();
730 Mixer::OutputChannel::~OutputChannel()
732 if (has_current_frame) {
733 parent->release_display_frame(¤t_frame);
735 if (has_ready_frame) {
736 parent->release_display_frame(&ready_frame);
740 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
742 // Store this frame for display. Remove the ready frame if any
743 // (it was seemingly never used).
745 unique_lock<mutex> lock(frame_mutex);
746 if (has_ready_frame) {
747 parent->release_display_frame(&ready_frame);
750 has_ready_frame = true;
753 if (has_new_frame_ready_callback) {
754 new_frame_ready_callback();
758 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
760 unique_lock<mutex> lock(frame_mutex);
761 if (!has_current_frame && !has_ready_frame) {
765 if (has_current_frame && has_ready_frame) {
766 // We have a new ready frame. Toss the current one.
767 parent->release_display_frame(¤t_frame);
768 has_current_frame = false;
770 if (has_ready_frame) {
771 assert(!has_current_frame);
772 current_frame = ready_frame;
773 ready_frame.ready_fence.reset(); // Drop the refcount.
774 ready_frame.input_frames.clear(); // Drop the refcounts.
775 has_current_frame = true;
776 has_ready_frame = false;
779 *frame = current_frame;
783 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
785 new_frame_ready_callback = callback;
786 has_new_frame_ready_callback = true;