git.sesse.net Git - nageru/blob - mixer.cpp

   1 #define WIDTH 1280
   2 #define HEIGHT 720
   3 #define EXTRAHEIGHT 30
   4
   5 #undef Success
   6
   7 #include "mixer.h"
   8
   9 #include <assert.h>
  10 #include <effect.h>
  11 #include <effect_chain.h>
  12 #include <effect_util.h>
  13 #include <epoxy/egl.h>
  14 #include <features.h>
  15 #include <image_format.h>
  16 #include <init.h>
  17 #include <overlay_effect.h>
  18 #include <padding_effect.h>
  19 #include <resample_effect.h>
  20 #include <resource_pool.h>
  21 #include <saturation_effect.h>
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <sys/time.h>
  26 #include <time.h>
  27 #include <util.h>
  28 #include <white_balance_effect.h>
  29 #include <ycbcr.h>
  30 #include <ycbcr_input.h>
  31 #include <cmath>
  32 #include <condition_variable>
  33 #include <cstddef>
  34 #include <memory>
  35 #include <mutex>
  36 #include <string>
  37 #include <thread>
  38 #include <vector>
  39
  40 #include "bmusb/bmusb.h"
  41 #include "context.h"
  42 #include "h264encode.h"
  43 #include "pbo_frame_allocator.h"
  44 #include "ref_counted_gl_sync.h"
  45 #include "timebase.h"
  46
  47 class QOpenGLContext;
  48
  49 using namespace movit;
  50 using namespace std;
  51 using namespace std::placeholders;
  52
  53 Mixer *global_mixer = nullptr;
  54
  55 namespace {
  56
  57 void convert_fixed24_to_fp32(float *dst, size_t out_channels, const uint8_t *src, size_t in_channels, size_t num_samples)
  58 {
  59         for (size_t i = 0; i < num_samples; ++i) {
  60                 for (size_t j = 0; j < out_channels; ++j) {
  61                         uint32_t s1 = *src++;
  62                         uint32_t s2 = *src++;
  63                         uint32_t s3 = *src++;
  64                         uint32_t s = s1 | (s1 << 8) | (s2 << 16) | (s3 << 24);
  65                         dst[i * out_channels + j] = int(s) * (1.0f / 4294967296.0f);
  66                 }
  67                 src += 3 * (in_channels - out_channels);
  68         }
  69 }
  70
  71 }  // namespace
  72
  73 Mixer::Mixer(const QSurfaceFormat &format)
  74         : mixer_surface(create_surface(format)),
  75           h264_encoder_surface(create_surface(format))
  76 {
  77         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
  78         check_error();
  79
  80         resource_pool.reset(new ResourcePool);
  81         theme.reset(new Theme("theme.lua", resource_pool.get()));
  82         output_channel[OUTPUT_LIVE].parent = this;
  83         output_channel[OUTPUT_PREVIEW].parent = this;
  84         output_channel[OUTPUT_INPUT0].parent = this;
  85         output_channel[OUTPUT_INPUT1].parent = this;
  86
  87         ImageFormat inout_format;
  88         inout_format.color_space = COLORSPACE_sRGB;
  89         inout_format.gamma_curve = GAMMA_sRGB;
  90
  91         // Display chain; shows the live output produced by the main chain (its RGBA version).
  92         display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
  93         check_error();
  94         display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT);  // FIXME: GL_UNSIGNED_BYTE is really wrong.
  95         display_chain->add_input(display_input);
  96         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
  97         display_chain->set_dither_bits(0);  // Don't bother.
  98         display_chain->finalize();
  99
 100         h264_encoder.reset(new H264Encoder(h264_encoder_surface, WIDTH, HEIGHT, "test.mp4"));
 101
 102         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 103                 printf("Configuring card %d...\n", card_index);
 104                 CaptureCard *card = &cards[card_index];
 105                 card->usb = new BMUSBCapture(0x1edb, card_index == 0 ? 0xbd3b : 0xbd4f);
 106                 card->usb->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 107                 card->frame_allocator.reset(new PBOFrameAllocator(WIDTH * (HEIGHT+EXTRAHEIGHT) * 2 + 44, WIDTH, HEIGHT));
 108                 card->usb->set_video_frame_allocator(card->frame_allocator.get());
 109                 card->surface = create_surface(format);
 110                 card->usb->set_dequeue_thread_callbacks(
 111                         [card]{
 112                                 eglBindAPI(EGL_OPENGL_API);
 113                                 card->context = create_context();
 114                                 if (!make_current(card->context, card->surface)) {
 115                                         printf("failed to create bmusb context\n");
 116                                         exit(1);
 117                                 }
 118                                 printf("inited!\n");
 119                         },
 120                         [this]{
 121                                 resource_pool->clean_context();
 122                         });
 123                 card->resampler.reset(new Resampler(48000.0, 48000.0, 2));
 124                 card->usb->configure_card();
 125         }
 126
 127         BMUSBCapture::start_bm_thread();
 128
 129         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 130                 cards[card_index].usb->start_bm_capture();
 131         }
 132
 133         //chain->enable_phase_timing(true);
 134
 135         // Set up stuff for NV12 conversion.
 136
 137         // Cb/Cr shader.
 138         string cbcr_vert_shader = read_file("vs-cbcr.130.vert");
 139         string cbcr_frag_shader =
 140                 "#version 130 \n"
 141                 "in vec2 tc0; \n"
 142                 "uniform sampler2D cbcr_tex; \n"
 143                 "void main() { \n"
 144                 "    gl_FragColor = texture2D(cbcr_tex, tc0); \n"
 145                 "} \n";
 146         cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader);
 147 }
 148
 149 Mixer::~Mixer()
 150 {
 151         resource_pool->release_glsl_program(cbcr_program_num);
 152         BMUSBCapture::stop_bm_thread();
 153
 154         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 155                 {
 156                         unique_lock<mutex> lock(bmusb_mutex);
 157                         cards[card_index].should_quit = true;  // Unblock thread.
 158                         cards[card_index].new_data_ready_changed.notify_all();
 159                 }
 160                 cards[card_index].usb->stop_dequeue_thread();
 161         }
 162 }
 163
 164 namespace {
 165
 166 int unwrap_timecode(uint16_t current_wrapped, int last)
 167 {
 168         uint16_t last_wrapped = last & 0xffff;
 169         if (current_wrapped > last_wrapped) {
 170                 return (last & ~0xffff) | current_wrapped;
 171         } else {
 172                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 173         }
 174 }
 175
 176 }  // namespace
 177
 178 void Mixer::bm_frame(int card_index, uint16_t timecode,
 179                      FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 180                      FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
 181 {
 182         CaptureCard *card = &cards[card_index];
 183
 184         if (audio_frame.len - audio_offset > 30000) {
 185                 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",
 186                         card_index, int(audio_frame.len), int(audio_offset),
 187                         timecode, int(video_frame.len), int(video_offset), video_format);
 188                 if (video_frame.owner) {
 189                         video_frame.owner->release_frame(video_frame);
 190                 }
 191                 if (audio_frame.owner) {
 192                         audio_frame.owner->release_frame(audio_frame);
 193                 }
 194                 return;
 195         }
 196
 197         // Convert the audio to stereo fp32 and add it.
 198         size_t num_samples = (audio_frame.len - audio_offset) / 8 / 3;
 199         vector<float> audio;
 200         audio.resize(num_samples * 2);
 201         convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, 8, num_samples);
 202
 203         int unwrapped_timecode = timecode;
 204         int dropped_frames = 0;
 205         if (card->last_timecode != -1) {
 206                 unwrapped_timecode = unwrap_timecode(unwrapped_timecode, card->last_timecode);
 207                 dropped_frames = unwrapped_timecode - card->last_timecode - 1;
 208         }
 209         card->last_timecode = unwrapped_timecode;
 210
 211         // Add the audio.
 212         {
 213                 unique_lock<mutex> lock(card->audio_mutex);
 214
 215                 int unwrapped_timecode = timecode;
 216                 if (dropped_frames > 60 * 2) {
 217                         fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around), resetting resampler\n",
 218                                 card_index);
 219                         card->resampler.reset(new Resampler(48000.0, 48000.0, 2));
 220                 } else if (dropped_frames > 0) {
 221                         // Insert silence as needed.
 222                         fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 223                                 card_index, dropped_frames, timecode);
 224                         vector<float> silence;
 225                         silence.resize((48000 / 60) * 2);
 226                         for (int i = 0; i < dropped_frames; ++i) {
 227                                 card->resampler->add_input_samples((unwrapped_timecode - dropped_frames + i) / 60.0, silence.data(), (48000 / 60));
 228                         }
 229                 }
 230                 card->resampler->add_input_samples(unwrapped_timecode / 60.0, audio.data(), num_samples);
 231         }
 232
 233         // Done with the audio, so release it.
 234         if (audio_frame.owner) {
 235                 audio_frame.owner->release_frame(audio_frame);
 236         }
 237
 238         {
 239                 // Wait until the previous frame was consumed.
 240                 unique_lock<mutex> lock(bmusb_mutex);
 241                 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
 242                 if (card->should_quit) return;
 243         }
 244
 245         if (video_frame.len - video_offset != WIDTH * (HEIGHT+EXTRAHEIGHT) * 2) {
 246                 if (video_frame.len != 0) {
 247                         printf("Card %d: Dropping video frame with wrong length (%ld)\n",
 248                                 card_index, video_frame.len - video_offset);
 249                 }
 250                 if (video_frame.owner) {
 251                         video_frame.owner->release_frame(video_frame);
 252                 }
 253
 254                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 255                 // so that pts can go up accordingly.
 256                 {
 257                         unique_lock<mutex> lock(bmusb_mutex);
 258                         card->new_data_ready = true;
 259                         card->new_frame = RefCountedFrame(FrameAllocator::Frame());
 260                         card->new_data_ready_fence = nullptr;
 261                         card->dropped_frames = dropped_frames;
 262                         card->new_data_ready_changed.notify_all();
 263                 }
 264                 return;
 265         }
 266
 267         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
 268         GLuint pbo = userdata->pbo;
 269         check_error();
 270         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
 271         check_error();
 272         glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
 273         check_error();
 274         //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
 275         //check_error();
 276
 277         // Upload the textures.
 278         glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
 279         check_error();
 280         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));
 281         check_error();
 282         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
 283         check_error();
 284         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, WIDTH/2, HEIGHT, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(WIDTH * 25 + 22));
 285         check_error();
 286         glBindTexture(GL_TEXTURE_2D, 0);
 287         check_error();
 288         GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 289         check_error();
 290         assert(fence != nullptr);
 291
 292         {
 293                 unique_lock<mutex> lock(bmusb_mutex);
 294                 card->new_data_ready = true;
 295                 card->new_frame = RefCountedFrame(video_frame);
 296                 card->new_data_ready_fence = fence;
 297                 card->dropped_frames = dropped_frames;
 298                 card->new_data_ready_changed.notify_all();
 299         }
 300 }
 301
 302 void Mixer::thread_func()
 303 {
 304         eglBindAPI(EGL_OPENGL_API);
 305         QOpenGLContext *context = create_context();
 306         if (!make_current(context, mixer_surface)) {
 307                 printf("oops\n");
 308                 exit(1);
 309         }
 310
 311         struct timespec start, now;
 312         clock_gettime(CLOCK_MONOTONIC, &start);
 313
 314         int frame = 0;
 315         int dropped_frames = 0;
 316
 317         while (!should_quit) {
 318                 CaptureCard card_copy[NUM_CARDS];
 319
 320                 {
 321                         unique_lock<mutex> lock(bmusb_mutex);
 322
 323                         // The first card is the master timer, so wait for it to have a new frame.
 324                         // TODO: Make configurable, and with a timeout.
 325                         cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
 326
 327                         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 328                                 CaptureCard *card = &cards[card_index];
 329                                 card_copy[card_index].usb = card->usb;
 330                                 card_copy[card_index].new_data_ready = card->new_data_ready;
 331                                 card_copy[card_index].new_frame = card->new_frame;
 332                                 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
 333                                 card_copy[card_index].new_frame_audio = move(card->new_frame_audio);
 334                                 card_copy[card_index].dropped_frames = card->dropped_frames;
 335                                 card->new_data_ready = false;
 336                                 card->new_data_ready_changed.notify_all();
 337                         }
 338                 }
 339
 340                 // Resample the audio as needed, including from previously dropped frames.
 341                 vector<float> samples_out;
 342                 // TODO: Allow using audio from the other card(s) as well.
 343                 for (unsigned frame_num = 0; frame_num < card_copy[0].dropped_frames + 1; ++frame_num) {
 344                         for (unsigned card_index = 0; card_index < NUM_CARDS; ++card_index) {
 345                                 samples_out.resize((48000 / 60) * 2);
 346                                 {
 347                                         unique_lock<mutex> lock(cards[card_index].audio_mutex);
 348                                         if (!cards[card_index].resampler->get_output_samples(pts(), &samples_out[0], 48000 / 60)) {
 349                                                 printf("Card %d reported previous underrun.\n", card_index);
 350                                         }
 351                                 }
 352                                 if (card_index == 0) {
 353                                         h264_encoder->add_audio(pts_int, move(samples_out));
 354                                 }
 355                         }
 356                         if (frame_num != card_copy[0].dropped_frames) {
 357                                 // For dropped frames, increase the pts.
 358                                 ++dropped_frames;
 359                                 pts_int += TIMEBASE / 60;
 360                         }
 361                 }
 362
 363                 // If the first card is reporting a corrupted or otherwise dropped frame,
 364                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
 365                 if (card_copy[0].new_frame->len == 0) {
 366                         ++dropped_frames;
 367                         pts_int += TIMEBASE / 60;
 368                         continue;
 369                 }
 370
 371                 for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 372                         CaptureCard *card = &card_copy[card_index];
 373                         if (!card->new_data_ready || card->new_frame->len == 0)
 374                                 continue;
 375
 376                         assert(card->new_frame != nullptr);
 377                         bmusb_current_rendering_frame[card_index] = card->new_frame;
 378                         check_error();
 379
 380                         // The new texture might still be uploaded,
 381                         // tell the GPU to wait until it's there.
 382                         if (card->new_data_ready_fence) {
 383                                 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
 384                                 check_error();
 385                                 glDeleteSync(card->new_data_ready_fence);
 386                                 check_error();
 387                         }
 388                         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
 389                         theme->set_input_textures(card_index, userdata->tex_y, userdata->tex_cbcr);
 390                 }
 391
 392                 // Get the main chain from the theme, and set its state immediately.
 393                 pair<EffectChain *, function<void()>> theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT);
 394                 EffectChain *chain = theme_main_chain.first;
 395                 theme_main_chain.second();
 396
 397                 GLuint y_tex, cbcr_tex;
 398                 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
 399                 assert(got_frame);
 400
 401                 // Render main chain.
 402                 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
 403                 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT);  // Saves texture bandwidth, although dithering gets messed up.
 404                 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
 405                 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
 406                 resource_pool->release_fbo(fbo);
 407
 408                 subsample_chroma(cbcr_full_tex, cbcr_tex);
 409                 resource_pool->release_2d_texture(cbcr_full_tex);
 410
 411                 // Set the right state for rgba_tex.
 412                 glBindFramebuffer(GL_FRAMEBUFFER, 0);
 413                 glBindTexture(GL_TEXTURE_2D, rgba_tex);
 414                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 415                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 416                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 417
 418                 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 419                 check_error();
 420
 421                 // Make sure the H.264 gets a reference to all the
 422                 // input frames needed, so that they are not released back
 423                 // until the rendering is done.
 424                 vector<RefCountedFrame> input_frames;
 425                 for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 426                         input_frames.push_back(bmusb_current_rendering_frame[card_index]);
 427                 }
 428                 const int64_t av_delay = TIMEBASE / 10;  // Corresponds to the fixed delay in resampler.h. TODO: Make less hard-coded.
 429                 h264_encoder->end_frame(fence, pts_int + av_delay, input_frames);
 430                 ++frame;
 431                 pts_int += TIMEBASE / 60;
 432
 433                 // The live frame just shows the RGBA texture we just rendered.
 434                 // It owns rgba_tex now.
 435                 DisplayFrame live_frame;
 436                 live_frame.chain = display_chain.get();
 437                 live_frame.setup_chain = [this, rgba_tex]{
 438                         display_input->set_texture_num(rgba_tex);
 439                 };
 440                 live_frame.ready_fence = fence;
 441                 live_frame.input_frames = {};
 442                 live_frame.temp_textures = { rgba_tex };
 443                 output_channel[OUTPUT_LIVE].output_frame(live_frame);
 444
 445                 // Set up preview and any additional channels.
 446                 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
 447                         DisplayFrame display_frame;
 448                         pair<EffectChain *, function<void()>> chain = theme->get_chain(i, pts(), WIDTH, HEIGHT);  // FIXME: dimensions
 449                         display_frame.chain = chain.first;
 450                         display_frame.setup_chain = chain.second;
 451                         display_frame.ready_fence = fence;
 452                         display_frame.input_frames = { bmusb_current_rendering_frame[0], bmusb_current_rendering_frame[1] };  // FIXME: possible to do better?
 453                         display_frame.temp_textures = {};
 454                         output_channel[i].output_frame(display_frame);
 455                 }
 456
 457                 clock_gettime(CLOCK_MONOTONIC, &now);
 458                 double elapsed = now.tv_sec - start.tv_sec +
 459                         1e-9 * (now.tv_nsec - start.tv_nsec);
 460                 if (frame % 100 == 0) {
 461                         printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
 462                                 frame, dropped_frames, elapsed, frame / elapsed,
 463                                 1e3 * elapsed / frame);
 464                 //      chain->print_phase_timing();
 465                 }
 466
 467 #if 0
 468                 // Reset every 100 frames, so that local variations in frame times
 469                 // (especially for the first few frames, when the shaders are
 470                 // compiled etc.) don't make it hard to measure for the entire
 471                 // remaining duration of the program.
 472                 if (frame == 10000) {
 473                         frame = 0;
 474                         start = now;
 475                 }
 476 #endif
 477                 check_error();
 478         }
 479
 480         resource_pool->clean_context();
 481 }
 482
 483 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
 484 {
 485         GLuint vao;
 486         glGenVertexArrays(1, &vao);
 487         check_error();
 488
 489         float vertices[] = {
 490                 0.0f, 2.0f,
 491                 0.0f, 0.0f,
 492                 2.0f, 0.0f
 493         };
 494
 495         glBindVertexArray(vao);
 496         check_error();
 497
 498         // Extract Cb/Cr.
 499         GLuint fbo = resource_pool->create_fbo(dst_tex);
 500         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 501         glViewport(0, 0, WIDTH/2, HEIGHT/2);
 502         check_error();
 503
 504         glUseProgram(cbcr_program_num);
 505         check_error();
 506
 507         glActiveTexture(GL_TEXTURE0);
 508         check_error();
 509         glBindTexture(GL_TEXTURE_2D, src_tex);
 510         check_error();
 511         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 512         check_error();
 513         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 514         check_error();
 515         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 516         check_error();
 517
 518         float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
 519         set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
 520
 521         GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
 522         GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
 523
 524         glDrawArrays(GL_TRIANGLES, 0, 3);
 525         check_error();
 526
 527         cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
 528         cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
 529
 530         glUseProgram(0);
 531         check_error();
 532
 533         resource_pool->release_fbo(fbo);
 534         glDeleteVertexArrays(1, &vao);
 535 }
 536
 537 void Mixer::release_display_frame(DisplayFrame *frame)
 538 {
 539         for (GLuint texnum : frame->temp_textures) {
 540                 resource_pool->release_2d_texture(texnum);
 541         }
 542         frame->temp_textures.clear();
 543         frame->ready_fence.reset();
 544         frame->input_frames.clear();
 545 }
 546
 547 void Mixer::start()
 548 {
 549         mixer_thread = thread(&Mixer::thread_func, this);
 550 }
 551
 552 void Mixer::quit()
 553 {
 554         should_quit = true;
 555         mixer_thread.join();
 556 }
 557
 558 void Mixer::transition_clicked(int transition_num)
 559 {
 560         theme->transition_clicked(transition_num, pts());
 561 }
 562
 563 void Mixer::channel_clicked(int preview_num)
 564 {
 565         theme->channel_clicked(preview_num);
 566 }
 567
 568 Mixer::OutputChannel::~OutputChannel()
 569 {
 570         if (has_current_frame) {
 571                 parent->release_display_frame(&current_frame);
 572         }
 573         if (has_ready_frame) {
 574                 parent->release_display_frame(&ready_frame);
 575         }
 576 }
 577
 578 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
 579 {
 580         // Store this frame for display. Remove the ready frame if any
 581         // (it was seemingly never used).
 582         {
 583                 unique_lock<mutex> lock(frame_mutex);
 584                 if (has_ready_frame) {
 585                         parent->release_display_frame(&ready_frame);
 586                 }
 587                 ready_frame = frame;
 588                 has_ready_frame = true;
 589         }
 590
 591         if (has_new_frame_ready_callback) {
 592                 new_frame_ready_callback();
 593         }
 594 }
 595
 596 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
 597 {
 598         unique_lock<mutex> lock(frame_mutex);
 599         if (!has_current_frame && !has_ready_frame) {
 600                 return false;
 601         }
 602
 603         if (has_current_frame && has_ready_frame) {
 604                 // We have a new ready frame. Toss the current one.
 605                 parent->release_display_frame(&current_frame);
 606                 has_current_frame = false;
 607         }
 608         if (has_ready_frame) {
 609                 assert(!has_current_frame);
 610                 current_frame = ready_frame;
 611                 ready_frame.ready_fence.reset();  // Drop the refcount.
 612                 ready_frame.input_frames.clear();  // Drop the refcounts.
 613                 has_current_frame = true;
 614                 has_ready_frame = false;
 615         }
 616
 617         *frame = current_frame;
 618         return true;
 619 }
 620
 621 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
 622 {
 623         new_frame_ready_callback = callback;
 624         has_new_frame_ready_callback = true;
 625 }