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

   1 #define WIDTH 1280
   2 #define HEIGHT 720
   3
   4 #undef Success
   5
   6 #include "mixer.h"
   7
   8 #include <assert.h>
   9 #include <effect.h>
  10 #include <effect_chain.h>
  11 #include <effect_util.h>
  12 #include <epoxy/egl.h>
  13 #include <features.h>
  14 #include <image_format.h>
  15 #include <init.h>
  16 #include <overlay_effect.h>
  17 #include <padding_effect.h>
  18 #include <resample_effect.h>
  19 #include <resource_pool.h>
  20 #include <saturation_effect.h>
  21 #include <stdint.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/time.h>
  25 #include <time.h>
  26 #include <util.h>
  27 #include <white_balance_effect.h>
  28 #include <ycbcr.h>
  29 #include <ycbcr_input.h>
  30 #include <cmath>
  31 #include <condition_variable>
  32 #include <cstddef>
  33 #include <memory>
  34 #include <mutex>
  35 #include <string>
  36 #include <thread>
  37 #include <vector>
  38
  39 #include "bmusb.h"
  40 #include "context.h"
  41 #include "h264encode.h"
  42 #include "pbo_frame_allocator.h"
  43 #include "ref_counted_gl_sync.h"
  44
  45 class QOpenGLContext;
  46
  47 using namespace movit;
  48 using namespace std;
  49 using namespace std::placeholders;
  50
  51 Mixer *global_mixer = nullptr;
  52
  53 Mixer::Mixer(const QSurfaceFormat &format)
  54         : mixer_surface(create_surface(format)),
  55           h264_encoder_surface(create_surface(format))
  56 {
  57         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
  58         check_error();
  59
  60         resource_pool.reset(new ResourcePool);
  61         output_channel[OUTPUT_LIVE].parent = this;
  62         output_channel[OUTPUT_PREVIEW].parent = this;
  63
  64         ImageFormat inout_format;
  65         inout_format.color_space = COLORSPACE_sRGB;
  66         inout_format.gamma_curve = GAMMA_sRGB;
  67
  68         YCbCrFormat input_ycbcr_format;
  69         input_ycbcr_format.chroma_subsampling_x = 2;
  70         input_ycbcr_format.chroma_subsampling_y = 1;
  71         input_ycbcr_format.cb_x_position = 0.0;
  72         input_ycbcr_format.cr_x_position = 0.0;
  73         input_ycbcr_format.cb_y_position = 0.5;
  74         input_ycbcr_format.cr_y_position = 0.5;
  75         input_ycbcr_format.luma_coefficients = YCBCR_REC_601;
  76         input_ycbcr_format.full_range = false;
  77
  78         YCbCrFormat output_ycbcr_format;
  79         output_ycbcr_format.chroma_subsampling_x = 1;
  80         output_ycbcr_format.chroma_subsampling_y = 1;
  81         output_ycbcr_format.luma_coefficients = YCBCR_REC_601;
  82         output_ycbcr_format.full_range = false;
  83
  84         // Main chain.
  85         chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
  86         check_error();
  87         input[0] = new YCbCrInput(inout_format, input_ycbcr_format, WIDTH, HEIGHT, YCBCR_INPUT_SPLIT_Y_AND_CBCR);
  88         chain->add_input(input[0]);
  89         input[1] = new YCbCrInput(inout_format, input_ycbcr_format, WIDTH, HEIGHT, YCBCR_INPUT_SPLIT_Y_AND_CBCR);
  90         chain->add_input(input[1]);
  91         resample_effect = chain->add_effect(new ResampleEffect(), input[0]);
  92         padding_effect = chain->add_effect(new IntegralPaddingEffect());
  93         float border_color[] = { 0.0f, 0.0f, 0.0f, 1.0f };
  94         CHECK(padding_effect->set_vec4("border_color", border_color));
  95
  96         resample2_effect = chain->add_effect(new ResampleEffect(), input[1]);
  97         Effect *saturation_effect = chain->add_effect(new SaturationEffect());
  98         CHECK(saturation_effect->set_float("saturation", 0.3f));
  99         Effect *wb_effect = chain->add_effect(new WhiteBalanceEffect());
 100         CHECK(wb_effect->set_float("output_color_temperature", 3500.0));
 101         padding2_effect = chain->add_effect(new IntegralPaddingEffect());
 102
 103         chain->add_effect(new OverlayEffect(), padding_effect, padding2_effect);
 104
 105         chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 106         chain->add_ycbcr_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED, output_ycbcr_format, YCBCR_OUTPUT_SPLIT_Y_AND_CBCR);
 107         chain->set_dither_bits(8);
 108         chain->set_output_origin(OUTPUT_ORIGIN_TOP_LEFT);
 109         chain->finalize();
 110
 111         // Preview chain (always shows just first input for now).
 112         preview_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
 113         check_error();
 114         preview_input = new YCbCrInput(inout_format, input_ycbcr_format, WIDTH, HEIGHT, YCBCR_INPUT_SPLIT_Y_AND_CBCR);
 115         preview_chain->add_input(preview_input);
 116         preview_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 117         preview_chain->set_dither_bits(0);  // Don't bother.
 118         preview_chain->set_output_origin(OUTPUT_ORIGIN_TOP_LEFT);
 119         preview_chain->finalize();
 120
 121         h264_encoder.reset(new H264Encoder(h264_encoder_surface, WIDTH, HEIGHT, "test.mp4"));
 122
 123         printf("Configuring first card...\n");
 124         cards[0].usb = new BMUSBCapture(0x1edb, 0xbd3b);  // 0xbd4f
 125         cards[0].usb->set_frame_callback(std::bind(&Mixer::bm_frame, this, 0, _1, _2, _3, _4, _5, _6, _7));
 126         cards[0].frame_allocator.reset(new PBOFrameAllocator(1280 * 750 * 2 + 44, 1280, 720));
 127         cards[0].usb->set_video_frame_allocator(cards[0].frame_allocator.get());
 128         cards[0].usb->configure_card();
 129         cards[0].surface = create_surface(format);
 130 #if NUM_CARDS == 2
 131         cards[1].surface = create_surface(format);
 132 #endif
 133
 134         if (NUM_CARDS == 2) {
 135                 printf("Configuring second card...\n");
 136                 cards[1].usb = new BMUSBCapture(0x1edb, 0xbd4f);
 137                 cards[1].usb->set_frame_callback(std::bind(&Mixer::bm_frame, this, 1, _1, _2, _3, _4, _5, _6, _7));
 138                 cards[1].frame_allocator.reset(new PBOFrameAllocator(1280 * 750 * 2 + 44, 1280, 720));
 139                 cards[1].usb->set_video_frame_allocator(cards[1].frame_allocator.get());
 140                 cards[1].usb->configure_card();
 141         }
 142
 143         BMUSBCapture::start_bm_thread();
 144
 145         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 146                 cards[card_index].usb->start_bm_capture();
 147                 input[card_index]->set_pixel_data(0, nullptr, 0);
 148                 input[card_index]->set_pixel_data(1, nullptr, 0);
 149         }
 150
 151         //chain->enable_phase_timing(true);
 152
 153         // Set up stuff for NV12 conversion.
 154
 155         // Cb/Cr shader.
 156         string cbcr_vert_shader = read_file("vs-cbcr.130.vert");
 157         string cbcr_frag_shader =
 158                 "#version 130 \n"
 159                 "in vec2 tc0; \n"
 160                 "uniform sampler2D cbcr_tex; \n"
 161                 "void main() { \n"
 162                 "    gl_FragColor = texture2D(cbcr_tex, tc0); \n"
 163                 "} \n";
 164         cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader);
 165 }
 166
 167 Mixer::~Mixer()
 168 {
 169         resource_pool->release_glsl_program(cbcr_program_num);
 170         BMUSBCapture::stop_bm_thread();
 171 }
 172
 173 void Mixer::bm_frame(int card_index, uint16_t timecode,
 174                      FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 175                      FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
 176 {
 177         CaptureCard *card = &cards[card_index];
 178         if (!card->thread_initialized) {
 179                 printf("initializing context for bmusb thread %d\n", card_index);
 180                 eglBindAPI(EGL_OPENGL_API);
 181                 card->context = create_context();
 182                 if (!make_current(card->context, card->surface)) {
 183                         printf("failed to create bmusb context\n");
 184                         exit(1);
 185                 }
 186                 card->thread_initialized = true;
 187         }
 188
 189         if (video_frame.len - video_offset != 1280 * 750 * 2) {
 190                 printf("dropping frame with wrong length (%ld)\n", video_frame.len - video_offset);
 191                 FILE *fp = fopen("frame.raw", "wb");
 192                 fwrite(video_frame.data, video_frame.len, 1, fp);
 193                 fclose(fp);
 194                 //exit(1);
 195                 card->usb->get_video_frame_allocator()->release_frame(video_frame);
 196                 card->usb->get_audio_frame_allocator()->release_frame(audio_frame);
 197                 return;
 198         }
 199         {
 200                 // Wait until the previous frame was consumed.
 201                 std::unique_lock<std::mutex> lock(bmusb_mutex);
 202                 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready; });
 203         }
 204         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
 205         GLuint pbo = userdata->pbo;
 206         check_error();
 207         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
 208         check_error();
 209         glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
 210         check_error();
 211         //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
 212         //check_error();
 213
 214         // Upload the textures.
 215         glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
 216         check_error();
 217         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1280, 720, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET((1280 * 750 * 2 + 44) / 2 + 1280 * 25 + 22));
 218         check_error();
 219         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
 220         check_error();
 221         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1280/2, 720, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(1280 * 25 + 22));
 222         check_error();
 223         glBindTexture(GL_TEXTURE_2D, 0);
 224         check_error();
 225         GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 226         check_error();
 227         assert(fence != nullptr);
 228         {
 229                 std::unique_lock<std::mutex> lock(bmusb_mutex);
 230                 card->new_data_ready = true;
 231                 card->new_frame = RefCountedFrame(video_frame);
 232                 card->new_data_ready_fence = fence;
 233                 card->new_data_ready_changed.notify_all();
 234         }
 235
 236         // Video frame will be released when last user of card->new_frame goes out of scope.
 237         card->usb->get_audio_frame_allocator()->release_frame(audio_frame);
 238 }
 239
 240 void Mixer::place_rectangle(Effect *resample_effect, Effect *padding_effect, float x0, float y0, float x1, float y1)
 241 {
 242         float srcx0 = 0.0f;
 243         float srcx1 = 1.0f;
 244         float srcy0 = 0.0f;
 245         float srcy1 = 1.0f;
 246
 247         // Cull.
 248         if (x0 > 1280.0 || x1 < 0.0 || y0 > 720.0 || y1 < 0.0) {
 249                 CHECK(resample_effect->set_int("width", 1));
 250                 CHECK(resample_effect->set_int("height", 1));
 251                 CHECK(resample_effect->set_float("zoom_x", 1280.0));
 252                 CHECK(resample_effect->set_float("zoom_y", 720.0));
 253                 CHECK(padding_effect->set_int("left", 2000));
 254                 CHECK(padding_effect->set_int("top", 2000));
 255                 return;
 256         }
 257
 258         // Clip. (TODO: Clip on upper/left sides, too.)
 259         if (x1 > 1280.0) {
 260                 srcx1 = (1280.0 - x0) / (x1 - x0);
 261                 x1 = 1280.0;
 262         }
 263         if (y1 > 720.0) {
 264                 srcy1 = (720.0 - y0) / (y1 - y0);
 265                 y1 = 720.0;
 266         }
 267
 268         float x_subpixel_offset = x0 - floor(x0);
 269         float y_subpixel_offset = y0 - floor(y0);
 270
 271         // Resampling must be to an integral number of pixels. Round up,
 272         // and then add an extra pixel so we have some leeway for the border.
 273         int width = int(ceil(x1 - x0)) + 1;
 274         int height = int(ceil(y1 - y0)) + 1;
 275         CHECK(resample_effect->set_int("width", width));
 276         CHECK(resample_effect->set_int("height", height));
 277
 278         // Correct the discrepancy with zoom. (This will leave a small
 279         // excess edge of pixels and subpixels, which we'll correct for soon.)
 280         float zoom_x = (x1 - x0) / (width * (srcx1 - srcx0));
 281         float zoom_y = (y1 - y0) / (height * (srcy1 - srcy0));
 282         CHECK(resample_effect->set_float("zoom_x", zoom_x));
 283         CHECK(resample_effect->set_float("zoom_y", zoom_y));
 284         CHECK(resample_effect->set_float("zoom_center_x", 0.0f));
 285         CHECK(resample_effect->set_float("zoom_center_y", 0.0f));
 286
 287         // Padding must also be to a whole-pixel offset.
 288         CHECK(padding_effect->set_int("left", floor(x0)));
 289         CHECK(padding_effect->set_int("top", floor(y0)));
 290
 291         // Correct _that_ discrepancy by subpixel offset in the resampling.
 292         CHECK(resample_effect->set_float("left", -x_subpixel_offset / zoom_x));
 293         CHECK(resample_effect->set_float("top", -y_subpixel_offset / zoom_y));
 294
 295         // Finally, adjust the border so it is exactly where we want it.
 296         CHECK(padding_effect->set_float("border_offset_left", x_subpixel_offset));
 297         CHECK(padding_effect->set_float("border_offset_right", x1 - (floor(x0) + width)));
 298         CHECK(padding_effect->set_float("border_offset_top", y_subpixel_offset));
 299         CHECK(padding_effect->set_float("border_offset_bottom", y1 - (floor(y0) + height)));
 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         while (!should_quit) {
 315                 ++frame;
 316
 317                 //int width0 = lrintf(848 * (1.0 + 0.2 * sin(frame * 0.02)));
 318                 int width0 = 848;
 319                 int height0 = lrintf(width0 * 9.0 / 16.0);
 320
 321                 //float top0 = 96 + 48 * sin(frame * 0.005);
 322                 //float left0 = 96 + 48 * cos(frame * 0.006);
 323                 float top0 = 48;
 324                 float left0 = 16;
 325                 float bottom0 = top0 + height0;
 326                 float right0 = left0 + width0;
 327
 328                 int width1 = 384;
 329                 int height1 = 216;
 330
 331                 float bottom1 = 720 - 48;
 332                 float right1 = 1280 - 16;
 333                 float top1 = bottom1 - height1;
 334                 float left1 = right1 - width1;
 335
 336                 if (current_source == SOURCE_INPUT1) {
 337                         top0 = 0.0;
 338                         bottom0 = HEIGHT;
 339                         left0 = 0.0;
 340                         right0 = WIDTH;
 341
 342                         top1 = HEIGHT + 10;
 343                         bottom1 = HEIGHT + 20;
 344                         left1 = WIDTH + 10;
 345                         right1 = WIDTH + 20;
 346                 } else if (current_source == SOURCE_INPUT2) {
 347                         top1 = 0.0;
 348                         bottom1 = HEIGHT;
 349                         left1 = 0.0;
 350                         right1 = WIDTH;
 351
 352                         top0 = HEIGHT + 10;
 353                         bottom0 = HEIGHT + 20;
 354                         left0 = WIDTH + 10;
 355                         right0 = WIDTH + 20;
 356                 } else {
 357                         float t = 0.5 + 0.5 * cos(frame * 0.006);
 358                         float scale0 = 1.0 + t * (1280.0 / 848.0 - 1.0);
 359                         float tx0 = 0.0 + t * (-16.0 * scale0);
 360                         float ty0 = 0.0 + t * (-48.0 * scale0);
 361
 362                         top0 = top0 * scale0 + ty0;
 363                         bottom0 = bottom0 * scale0 + ty0;
 364                         left0 = left0 * scale0 + tx0;
 365                         right0 = right0 * scale0 + tx0;
 366
 367                         top1 = top1 * scale0 + ty0;
 368                         bottom1 = bottom1 * scale0 + ty0;
 369                         left1 = left1 * scale0 + tx0;
 370                         right1 = right1 * scale0 + tx0;
 371                 }
 372
 373                 place_rectangle(resample_effect, padding_effect, left0, top0, right0, bottom0);
 374                 place_rectangle(resample2_effect, padding2_effect, left1, top1, right1, bottom1);
 375
 376                 CaptureCard card_copy[NUM_CARDS];
 377
 378                 {
 379                         std::unique_lock<std::mutex> lock(bmusb_mutex);
 380
 381                         // The first card is the master timer, so wait for it to have a new frame.
 382                         // TODO: Make configurable, and with a timeout.
 383                         cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
 384
 385                         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 386                                 CaptureCard *card = &cards[card_index];
 387                                 card_copy[card_index].usb = card->usb;
 388                                 card_copy[card_index].new_data_ready = card->new_data_ready;
 389                                 card_copy[card_index].new_frame = card->new_frame;
 390                                 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
 391                                 card->new_data_ready = false;
 392                                 card->new_data_ready_changed.notify_all();
 393                         }
 394                 }
 395
 396                 for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 397                         CaptureCard *card = &card_copy[card_index];
 398                         if (!card->new_data_ready)
 399                                 continue;
 400
 401                         bmusb_current_rendering_frame[card_index] = card->new_frame;
 402                         check_error();
 403
 404                         // The new texture might still be uploaded,
 405                         // tell the GPU to wait until it's there.
 406                         if (card->new_data_ready_fence)
 407                                 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
 408                         check_error();
 409                         glDeleteSync(card->new_data_ready_fence);
 410                         check_error();
 411                         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
 412                         input[card_index]->set_texture_num(0, userdata->tex_y);
 413                         input[card_index]->set_texture_num(1, userdata->tex_cbcr);
 414
 415                         if (NUM_CARDS == 1) {
 416                                 // Set to the other one, too.
 417                                 input[1]->set_texture_num(0, userdata->tex_y);
 418                                 input[1]->set_texture_num(1, userdata->tex_cbcr);
 419                         }
 420
 421                         if (card_index == 0) {
 422                                 preview_input->set_texture_num(0, userdata->tex_y);
 423                                 preview_input->set_texture_num(1, userdata->tex_cbcr);
 424                         }
 425                 }
 426
 427                 GLuint y_tex, cbcr_tex;
 428                 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
 429                 assert(got_frame);
 430
 431                 // Render main chain.
 432                 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
 433                 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT);  // Saves texture bandwidth, although dithering gets messed up.
 434                 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
 435                 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
 436                 resource_pool->release_fbo(fbo);
 437
 438                 subsample_chroma(cbcr_full_tex, cbcr_tex);
 439                 resource_pool->release_2d_texture(cbcr_full_tex);
 440
 441                 // Render preview chain.
 442                 GLuint preview_rgba_tex = resource_pool->create_2d_texture(GL_RGB565, output_channel[OUTPUT_PREVIEW].width, output_channel[OUTPUT_PREVIEW].height);  // Saves texture bandwidth, although dithering gets messed up.
 443                 fbo = resource_pool->create_fbo(preview_rgba_tex);
 444                 preview_chain->render_to_fbo(fbo, output_channel[OUTPUT_PREVIEW].width, output_channel[OUTPUT_PREVIEW].height);
 445                 resource_pool->release_fbo(fbo);
 446
 447                 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 448                 check_error();
 449
 450                 // Make sure the H.264 gets a reference to all the
 451                 // input frames needed, so that they are not released back
 452                 // until the rendering is done.
 453                 vector<RefCountedFrame> input_frames;
 454                 for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 455                         input_frames.push_back(bmusb_current_rendering_frame[card_index]);
 456                 }
 457                 h264_encoder->end_frame(fence, input_frames);
 458
 459                 output_channel[OUTPUT_LIVE].output_frame(rgba_tex, fence);
 460                 output_channel[OUTPUT_PREVIEW].output_frame(preview_rgba_tex, fence);
 461
 462                 clock_gettime(CLOCK_MONOTONIC, &now);
 463                 double elapsed = now.tv_sec - start.tv_sec +
 464                         1e-9 * (now.tv_nsec - start.tv_nsec);
 465                 if (frame % 100 == 0) {
 466                         printf("%d frames in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
 467                                 frame, elapsed, frame / elapsed,
 468                                 1e3 * elapsed / frame);
 469                 //      chain->print_phase_timing();
 470                 }
 471
 472                 // Reset every 100 frames, so that local variations in frame times
 473                 // (especially for the first few frames, when the shaders are
 474                 // compiled etc.) don't make it hard to measure for the entire
 475                 // remaining duration of the program.
 476                 if (frame == 10000) {
 477                         frame = 0;
 478                         start = now;
 479                 }
 480                 check_error();
 481         }
 482 }
 483
 484 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
 485 {
 486         GLuint vao;
 487         glGenVertexArrays(1, &vao);
 488         check_error();
 489
 490         float vertices[] = {
 491                 0.0f, 2.0f,
 492                 0.0f, 0.0f,
 493                 2.0f, 0.0f
 494         };
 495
 496         glBindVertexArray(vao);
 497         check_error();
 498
 499         // Extract Cb/Cr.
 500         GLuint fbo = resource_pool->create_fbo(dst_tex);
 501         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 502         glViewport(0, 0, WIDTH/2, HEIGHT/2);
 503         check_error();
 504
 505         glUseProgram(cbcr_program_num);
 506         check_error();
 507
 508         glActiveTexture(GL_TEXTURE0);
 509         check_error();
 510         glBindTexture(GL_TEXTURE_2D, src_tex);
 511         check_error();
 512         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 513         check_error();
 514         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 515         check_error();
 516         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 517         check_error();
 518
 519         float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
 520         set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
 521
 522         GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
 523         GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
 524
 525         glDrawArrays(GL_TRIANGLES, 0, 3);
 526         check_error();
 527
 528         cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
 529         cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
 530
 531         glUseProgram(0);
 532         check_error();
 533
 534         resource_pool->release_fbo(fbo);
 535         glDeleteVertexArrays(1, &vao);
 536 }
 537
 538 void Mixer::release_display_frame(DisplayFrame *frame)
 539 {
 540         resource_pool->release_2d_texture(frame->texnum);
 541         frame->texnum = 0;
 542         frame->ready_fence.reset();
 543 }
 544
 545 void Mixer::start()
 546 {
 547         mixer_thread = std::thread(&Mixer::thread_func, this);
 548 }
 549
 550 void Mixer::quit()
 551 {
 552         should_quit = true;
 553         mixer_thread.join();
 554 }
 555
 556 void Mixer::cut(Source source)
 557 {
 558         current_source = source;
 559 }
 560
 561 void Mixer::OutputChannel::output_frame(GLuint tex, RefCountedGLsync fence)
 562 {
 563         // Store this frame for display. Remove the ready frame if any
 564         // (it was seemingly never used).
 565         {
 566                 std::unique_lock<std::mutex> lock(frame_mutex);
 567                 if (has_ready_frame) {
 568                         parent->release_display_frame(&ready_frame);
 569                 }
 570                 ready_frame.texnum = tex;
 571                 ready_frame.ready_fence = fence;
 572                 has_ready_frame = true;
 573         }
 574
 575         if (has_new_frame_ready_callback) {
 576                 new_frame_ready_callback();
 577         }
 578 }
 579
 580 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
 581 {
 582         std::unique_lock<std::mutex> lock(frame_mutex);
 583         if (!has_current_frame && !has_ready_frame) {
 584                 return false;
 585         }
 586
 587         if (has_current_frame && has_ready_frame) {
 588                 // We have a new ready frame. Toss the current one.
 589                 parent->release_display_frame(&current_frame);
 590                 has_current_frame = false;
 591         }
 592         if (has_ready_frame) {
 593                 assert(!has_current_frame);
 594                 current_frame = ready_frame;
 595                 ready_frame.ready_fence.reset();  // Drop the refcount.
 596                 has_current_frame = true;
 597                 has_ready_frame = false;
 598         }
 599
 600         *frame = current_frame;
 601         return true;
 602 }
 603
 604 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
 605 {
 606         new_frame_ready_callback = callback;
 607         has_new_frame_ready_callback = true;
 608 }
 609
 610 void Mixer::OutputChannel::set_size(int width, int height)
 611 {
 612         this->width = width;
 613         this->height = height;
 614 }