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("test.ts", WIDTH, HEIGHT),
71 mixer_surface(create_surface(format)),
72 h264_encoder_surface(create_surface(format)),
73 level_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->resampler.reset(new Resampler(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);
158 resource_pool->release_glsl_program(cbcr_program_num);
159 BMUSBCapture::stop_bm_thread();
161 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
163 unique_lock<mutex> lock(bmusb_mutex);
164 cards[card_index].should_quit = true; // Unblock thread.
165 cards[card_index].new_data_ready_changed.notify_all();
167 cards[card_index].usb->stop_dequeue_thread();
173 int unwrap_timecode(uint16_t current_wrapped, int last)
175 uint16_t last_wrapped = last & 0xffff;
176 if (current_wrapped > last_wrapped) {
177 return (last & ~0xffff) | current_wrapped;
179 return 0x10000 + ((last & ~0xffff) | current_wrapped);
183 float find_peak(const vector<float> &samples)
185 float m = fabs(samples[0]);
186 for (size_t i = 1; i < samples.size(); ++i) {
187 m = std::max(m, fabs(samples[i]));
192 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
194 size_t num_samples = in.size() / 2;
195 out_l->resize(num_samples);
196 out_r->resize(num_samples);
198 const float *inptr = in.data();
199 float *lptr = &(*out_l)[0];
200 float *rptr = &(*out_r)[0];
201 for (size_t i = 0; i < num_samples; ++i) {
209 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
210 FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
211 FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
213 CaptureCard *card = &cards[card_index];
215 if (audio_frame.len - audio_offset > 30000) {
216 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",
217 card_index, int(audio_frame.len), int(audio_offset),
218 timecode, int(video_frame.len), int(video_offset), video_format);
219 if (video_frame.owner) {
220 video_frame.owner->release_frame(video_frame);
222 if (audio_frame.owner) {
223 audio_frame.owner->release_frame(audio_frame);
228 int unwrapped_timecode = timecode;
229 int dropped_frames = 0;
230 if (card->last_timecode != -1) {
231 unwrapped_timecode = unwrap_timecode(unwrapped_timecode, card->last_timecode);
232 dropped_frames = unwrapped_timecode - card->last_timecode - 1;
234 card->last_timecode = unwrapped_timecode;
236 // Convert the audio to stereo fp32 and add it.
237 size_t num_samples = (audio_frame.len >= audio_offset) ? (audio_frame.len - audio_offset) / 8 / 3 : 0;
239 audio.resize(num_samples * 2);
240 convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, 8, num_samples);
244 unique_lock<mutex> lock(card->audio_mutex);
246 int unwrapped_timecode = timecode;
247 if (dropped_frames > FPS * 2) {
248 fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around), resetting resampler\n",
250 card->resampler.reset(new Resampler(OUTPUT_FREQUENCY, OUTPUT_FREQUENCY, 2));
251 } else if (dropped_frames > 0) {
252 // Insert silence as needed.
253 fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
254 card_index, dropped_frames, timecode);
255 vector<float> silence;
256 silence.resize((OUTPUT_FREQUENCY / FPS) * 2);
257 for (int i = 0; i < dropped_frames; ++i) {
258 card->resampler->add_input_samples((unwrapped_timecode - dropped_frames + i) / double(FPS), silence.data(), (OUTPUT_FREQUENCY / FPS));
261 card->resampler->add_input_samples(unwrapped_timecode / double(FPS), audio.data(), num_samples);
264 // Done with the audio, so release it.
265 if (audio_frame.owner) {
266 audio_frame.owner->release_frame(audio_frame);
270 // Wait until the previous frame was consumed.
271 unique_lock<mutex> lock(bmusb_mutex);
272 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
273 if (card->should_quit) return;
276 if (video_frame.len - video_offset != WIDTH * (HEIGHT+EXTRAHEIGHT) * 2) {
277 if (video_frame.len != 0) {
278 printf("Card %d: Dropping video frame with wrong length (%ld)\n",
279 card_index, video_frame.len - video_offset);
281 if (video_frame.owner) {
282 video_frame.owner->release_frame(video_frame);
285 // Still send on the information that we _had_ a frame, even though it's corrupted,
286 // so that pts can go up accordingly.
288 unique_lock<mutex> lock(bmusb_mutex);
289 card->new_data_ready = true;
290 card->new_frame = RefCountedFrame(FrameAllocator::Frame());
291 card->new_data_ready_fence = nullptr;
292 card->dropped_frames = dropped_frames;
293 card->new_data_ready_changed.notify_all();
298 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
299 GLuint pbo = userdata->pbo;
301 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
303 glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
305 //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
308 // Upload the textures.
309 glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
311 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));
313 glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
315 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, WIDTH/2, HEIGHT, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(WIDTH * 25 + 22));
317 glBindTexture(GL_TEXTURE_2D, 0);
319 GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
321 assert(fence != nullptr);
324 unique_lock<mutex> lock(bmusb_mutex);
325 card->new_data_ready = true;
326 card->new_frame = RefCountedFrame(video_frame);
327 card->new_data_ready_fence = fence;
328 card->dropped_frames = dropped_frames;
329 card->new_data_ready_changed.notify_all();
333 void Mixer::thread_func()
335 eglBindAPI(EGL_OPENGL_API);
336 QOpenGLContext *context = create_context(mixer_surface);
337 if (!make_current(context, mixer_surface)) {
342 struct timespec start, now;
343 clock_gettime(CLOCK_MONOTONIC, &start);
346 int dropped_frames = 0;
348 while (!should_quit) {
349 CaptureCard card_copy[MAX_CARDS];
352 unique_lock<mutex> lock(bmusb_mutex);
354 // The first card is the master timer, so wait for it to have a new frame.
355 // TODO: Make configurable, and with a timeout.
356 cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
358 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
359 CaptureCard *card = &cards[card_index];
360 card_copy[card_index].usb = card->usb;
361 card_copy[card_index].new_data_ready = card->new_data_ready;
362 card_copy[card_index].new_frame = card->new_frame;
363 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
364 card_copy[card_index].dropped_frames = card->dropped_frames;
365 card->new_data_ready = false;
366 card->new_data_ready_changed.notify_all();
370 // Resample the audio as needed, including from previously dropped frames.
371 for (unsigned frame_num = 0; frame_num < card_copy[0].dropped_frames + 1; ++frame_num) {
372 process_audio_one_frame();
373 if (frame_num != card_copy[0].dropped_frames) {
374 // For dropped frames, increase the pts.
376 pts_int += TIMEBASE / FPS;
380 if (audio_level_callback != nullptr) {
381 double loudness_s = r128.loudness_S();
382 double loudness_i = r128.integrated();
383 double loudness_range_low = r128.range_min();
384 double loudness_range_high = r128.range_max();
386 audio_level_callback(loudness_s, 20.0 * log10(peak),
387 loudness_i, loudness_range_low, loudness_range_high);
390 for (unsigned card_index = 1; card_index < num_cards; ++card_index) {
391 if (card_copy[card_index].new_data_ready && card_copy[card_index].new_frame->len == 0) {
392 ++card_copy[card_index].dropped_frames;
394 if (card_copy[card_index].dropped_frames > 0) {
395 printf("Card %u dropped %d frames before this\n",
396 card_index, int(card_copy[card_index].dropped_frames));
400 // If the first card is reporting a corrupted or otherwise dropped frame,
401 // just increase the pts (skipping over this frame) and don't try to compute anything new.
402 if (card_copy[0].new_frame->len == 0) {
404 pts_int += TIMEBASE / FPS;
408 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
409 CaptureCard *card = &card_copy[card_index];
410 if (!card->new_data_ready || card->new_frame->len == 0)
413 assert(card->new_frame != nullptr);
414 bmusb_current_rendering_frame[card_index] = card->new_frame;
417 // The new texture might still be uploaded,
418 // tell the GPU to wait until it's there.
419 if (card->new_data_ready_fence) {
420 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
422 glDeleteSync(card->new_data_ready_fence);
425 const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
426 theme->set_input_textures(card_index, userdata->tex_y, userdata->tex_cbcr);
429 // Get the main chain from the theme, and set its state immediately.
430 pair<EffectChain *, function<void()>> theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT);
431 EffectChain *chain = theme_main_chain.first;
432 theme_main_chain.second();
434 GLuint y_tex, cbcr_tex;
435 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
438 // Render main chain.
439 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
440 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT); // Saves texture bandwidth, although dithering gets messed up.
441 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
443 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
444 resource_pool->release_fbo(fbo);
446 subsample_chroma(cbcr_full_tex, cbcr_tex);
447 resource_pool->release_2d_texture(cbcr_full_tex);
449 // Set the right state for rgba_tex.
450 glBindFramebuffer(GL_FRAMEBUFFER, 0);
451 glBindTexture(GL_TEXTURE_2D, rgba_tex);
452 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
453 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
454 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
456 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
459 // Make sure the H.264 gets a reference to all the
460 // input frames needed, so that they are not released back
461 // until the rendering is done.
462 vector<RefCountedFrame> input_frames;
463 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
464 input_frames.push_back(bmusb_current_rendering_frame[card_index]);
466 const int64_t av_delay = TIMEBASE / 10; // Corresponds to the fixed delay in resampler.h. TODO: Make less hard-coded.
467 h264_encoder->end_frame(fence, pts_int + av_delay, input_frames);
469 pts_int += TIMEBASE / FPS;
471 // The live frame just shows the RGBA texture we just rendered.
472 // It owns rgba_tex now.
473 DisplayFrame live_frame;
474 live_frame.chain = display_chain.get();
475 live_frame.setup_chain = [this, rgba_tex]{
476 display_input->set_texture_num(rgba_tex);
478 live_frame.ready_fence = fence;
479 live_frame.input_frames = {};
480 live_frame.temp_textures = { rgba_tex };
481 output_channel[OUTPUT_LIVE].output_frame(live_frame);
483 // Set up preview and any additional channels.
484 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
485 DisplayFrame display_frame;
486 pair<EffectChain *, function<void()>> chain = theme->get_chain(i, pts(), WIDTH, HEIGHT); // FIXME: dimensions
487 display_frame.chain = chain.first;
488 display_frame.setup_chain = chain.second;
489 display_frame.ready_fence = fence;
491 // FIXME: possible to do better?
492 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
493 display_frame.input_frames.push_back(bmusb_current_rendering_frame[card_index]);
495 display_frame.temp_textures = {};
496 output_channel[i].output_frame(display_frame);
499 clock_gettime(CLOCK_MONOTONIC, &now);
500 double elapsed = now.tv_sec - start.tv_sec +
501 1e-9 * (now.tv_nsec - start.tv_nsec);
502 if (frame % 100 == 0) {
503 printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
504 frame, dropped_frames, elapsed, frame / elapsed,
505 1e3 * elapsed / frame);
506 // chain->print_phase_timing();
510 // Reset every 100 frames, so that local variations in frame times
511 // (especially for the first few frames, when the shaders are
512 // compiled etc.) don't make it hard to measure for the entire
513 // remaining duration of the program.
514 if (frame == 10000) {
522 resource_pool->clean_context();
525 void Mixer::process_audio_one_frame()
527 vector<float> samples_card;
528 vector<float> samples_out;
529 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
530 samples_card.resize((OUTPUT_FREQUENCY / FPS) * 2);
532 unique_lock<mutex> lock(cards[card_index].audio_mutex);
533 if (!cards[card_index].resampler->get_output_samples(pts(), &samples_card[0], OUTPUT_FREQUENCY / FPS)) {
534 printf("Card %d reported previous underrun.\n", card_index);
537 // TODO: Allow using audio from the other card(s) as well.
538 if (card_index == 0) {
539 samples_out = move(samples_card);
543 // Cut away everything under 150 Hz; we don't need it for voice,
544 // and it will reduce headroom and confuse the compressor.
545 // (In particular, any hums at 50 or 60 Hz should be dampened.)
546 locut.render(samples_out.data(), samples_out.size() / 2, 150.0 * 2.0 * M_PI / OUTPUT_FREQUENCY, 0.5f);
548 // Apply a level compressor to get the general level right.
549 // Basically, if it's over about -40 dBFS, we squeeze it down to that level
550 // (or more precisely, near it, since we don't use infinite ratio),
551 // then apply a makeup gain to get it to -12 dBFS. -12 dBFS is, of course,
552 // entirely arbitrary, but from practical tests with speech, it seems to
553 // put ut around -23 LUFS, so it's a reasonable starting point for later use.
555 // TODO: Hook this up to a UI, so we can see the effects, and/or turn it off
556 // to control the gain manually instead. For now, there's only the #if-ed out
559 // TODO: Add the actual compressors/limiters (for taking care of transients)
560 // later in the chain.
561 float threshold = 0.01f; // -40 dBFS.
563 float attack_time = 0.1f;
564 float release_time = 10.0f;
565 float makeup_gain = pow(10.0f, 28.0f / 20.0f); // +28 dB takes us to -12 dBFS.
566 level_compressor.process(samples_out.data(), samples_out.size() / 2, threshold, ratio, attack_time, release_time, makeup_gain);
569 printf("level=%f (%+5.2f dBFS) attenuation=%f (%+5.2f dB) end_result=%+5.2f dB\n",
570 compressor.get_level(), 20.0 * log10(compressor.get_level()),
571 compressor.get_attenuation(), 20.0 * log10(compressor.get_attenuation()),
572 20.0 * log10(compressor.get_level() * compressor.get_attenuation() * makeup_gain));
575 // Find peak and R128 levels.
576 peak = std::max(peak, find_peak(samples_out));
577 vector<float> left, right;
578 deinterleave_samples(samples_out, &left, &right);
579 float *ptrs[] = { left.data(), right.data() };
580 r128.process(left.size(), ptrs);
582 // Actually add the samples to the output.
583 h264_encoder->add_audio(pts_int, move(samples_out));
586 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
589 glGenVertexArrays(1, &vao);
598 glBindVertexArray(vao);
602 GLuint fbo = resource_pool->create_fbo(dst_tex);
603 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
604 glViewport(0, 0, WIDTH/2, HEIGHT/2);
607 glUseProgram(cbcr_program_num);
610 glActiveTexture(GL_TEXTURE0);
612 glBindTexture(GL_TEXTURE_2D, src_tex);
614 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
616 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
618 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
621 float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
622 set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
624 GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
625 GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices); // Same as vertices.
627 glDrawArrays(GL_TRIANGLES, 0, 3);
630 cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
631 cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
636 resource_pool->release_fbo(fbo);
637 glDeleteVertexArrays(1, &vao);
640 void Mixer::release_display_frame(DisplayFrame *frame)
642 for (GLuint texnum : frame->temp_textures) {
643 resource_pool->release_2d_texture(texnum);
645 frame->temp_textures.clear();
646 frame->ready_fence.reset();
647 frame->input_frames.clear();
652 mixer_thread = thread(&Mixer::thread_func, this);
661 void Mixer::transition_clicked(int transition_num)
663 theme->transition_clicked(transition_num, pts());
666 void Mixer::channel_clicked(int preview_num)
668 theme->channel_clicked(preview_num);
671 Mixer::OutputChannel::~OutputChannel()
673 if (has_current_frame) {
674 parent->release_display_frame(¤t_frame);
676 if (has_ready_frame) {
677 parent->release_display_frame(&ready_frame);
681 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
683 // Store this frame for display. Remove the ready frame if any
684 // (it was seemingly never used).
686 unique_lock<mutex> lock(frame_mutex);
687 if (has_ready_frame) {
688 parent->release_display_frame(&ready_frame);
691 has_ready_frame = true;
694 if (has_new_frame_ready_callback) {
695 new_frame_ready_callback();
699 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
701 unique_lock<mutex> lock(frame_mutex);
702 if (!has_current_frame && !has_ready_frame) {
706 if (has_current_frame && has_ready_frame) {
707 // We have a new ready frame. Toss the current one.
708 parent->release_display_frame(¤t_frame);
709 has_current_frame = false;
711 if (has_ready_frame) {
712 assert(!has_current_frame);
713 current_frame = ready_frame;
714 ready_frame.ready_fence.reset(); // Drop the refcount.
715 ready_frame.input_frames.clear(); // Drop the refcounts.
716 has_current_frame = true;
717 has_ready_frame = false;
720 *frame = current_frame;
724 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
726 new_frame_ready_callback = callback;
727 has_new_frame_ready_callback = true;