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         // Display chain; shows the live output produced by the main chain (its RGBA version).
 112         display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
 113         check_error();
 114         display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT);  // FIXME: GL_UNSIGNED_BYTE is really wrong.
 115         display_chain->add_input(display_input);
 116         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 117         display_chain->set_dither_bits(0);  // Don't bother.
 118         display_chain->finalize();
 119
 120         // Preview chain (always shows just first input for now).
 121         preview_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
 122         check_error();
 123         preview_input = new YCbCrInput(inout_format, input_ycbcr_format, WIDTH, HEIGHT, YCBCR_INPUT_SPLIT_Y_AND_CBCR);
 124         preview_chain->add_input(preview_input);
 125         preview_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 126         preview_chain->set_dither_bits(0);  // Don't bother.
 127         preview_chain->finalize();
 128
 129         h264_encoder.reset(new H264Encoder(h264_encoder_surface, WIDTH, HEIGHT, "test.mp4"));
 130
 131         printf("Configuring first card...\n");
 132         cards[0].usb = new BMUSBCapture(0x1edb, 0xbd3b);  // 0xbd4f
 133         cards[0].usb->set_frame_callback(std::bind(&Mixer::bm_frame, this, 0, _1, _2, _3, _4, _5, _6, _7));
 134         cards[0].frame_allocator.reset(new PBOFrameAllocator(1280 * 750 * 2 + 44, 1280, 720));
 135         cards[0].usb->set_video_frame_allocator(cards[0].frame_allocator.get());
 136         cards[0].usb->configure_card();
 137         cards[0].surface = create_surface(format);
 138 #if NUM_CARDS == 2
 139         cards[1].surface = create_surface(format);
 140 #endif
 141
 142         if (NUM_CARDS == 2) {
 143                 printf("Configuring second card...\n");
 144                 cards[1].usb = new BMUSBCapture(0x1edb, 0xbd4f);
 145                 cards[1].usb->set_frame_callback(std::bind(&Mixer::bm_frame, this, 1, _1, _2, _3, _4, _5, _6, _7));
 146                 cards[1].frame_allocator.reset(new PBOFrameAllocator(1280 * 750 * 2 + 44, 1280, 720));
 147                 cards[1].usb->set_video_frame_allocator(cards[1].frame_allocator.get());
 148                 cards[1].usb->configure_card();
 149         }
 150
 151         BMUSBCapture::start_bm_thread();
 152
 153         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 154                 cards[card_index].usb->start_bm_capture();
 155                 input[card_index]->set_pixel_data(0, nullptr, 0);
 156                 input[card_index]->set_pixel_data(1, nullptr, 0);
 157         }
 158
 159         //chain->enable_phase_timing(true);
 160
 161         // Set up stuff for NV12 conversion.
 162
 163         // Cb/Cr shader.
 164         string cbcr_vert_shader = read_file("vs-cbcr.130.vert");
 165         string cbcr_frag_shader =
 166                 "#version 130 \n"
 167                 "in vec2 tc0; \n"
 168                 "uniform sampler2D cbcr_tex; \n"
 169                 "void main() { \n"
 170                 "    gl_FragColor = texture2D(cbcr_tex, tc0); \n"
 171                 "} \n";
 172         cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader);
 173 }
 174
 175 Mixer::~Mixer()
 176 {
 177         resource_pool->release_glsl_program(cbcr_program_num);
 178         BMUSBCapture::stop_bm_thread();
 179 }
 180
 181 void Mixer::bm_frame(int card_index, uint16_t timecode,
 182                      FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 183                      FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
 184 {
 185         CaptureCard *card = &cards[card_index];
 186         if (!card->thread_initialized) {
 187                 printf("initializing context for bmusb thread %d\n", card_index);
 188                 eglBindAPI(EGL_OPENGL_API);
 189                 card->context = create_context();
 190                 if (!make_current(card->context, card->surface)) {
 191                         printf("failed to create bmusb context\n");
 192                         exit(1);
 193                 }
 194                 card->thread_initialized = true;
 195         }
 196
 197         if (video_frame.len - video_offset != 1280 * 750 * 2) {
 198                 printf("dropping frame with wrong length (%ld)\n", video_frame.len - video_offset);
 199                 FILE *fp = fopen("frame.raw", "wb");
 200                 fwrite(video_frame.data, video_frame.len, 1, fp);
 201                 fclose(fp);
 202                 //exit(1);
 203                 card->usb->get_video_frame_allocator()->release_frame(video_frame);
 204                 card->usb->get_audio_frame_allocator()->release_frame(audio_frame);
 205                 return;
 206         }
 207         {
 208                 // Wait until the previous frame was consumed.
 209                 std::unique_lock<std::mutex> lock(bmusb_mutex);
 210                 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready; });
 211         }
 212         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
 213         GLuint pbo = userdata->pbo;
 214         check_error();
 215         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
 216         check_error();
 217         glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
 218         check_error();
 219         //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
 220         //check_error();
 221
 222         // Upload the textures.
 223         glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
 224         check_error();
 225         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1280, 720, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET((1280 * 750 * 2 + 44) / 2 + 1280 * 25 + 22));
 226         check_error();
 227         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
 228         check_error();
 229         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1280/2, 720, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(1280 * 25 + 22));
 230         check_error();
 231         glBindTexture(GL_TEXTURE_2D, 0);
 232         check_error();
 233         GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 234         check_error();
 235         assert(fence != nullptr);
 236         {
 237                 std::unique_lock<std::mutex> lock(bmusb_mutex);
 238                 card->new_data_ready = true;
 239                 card->new_frame = RefCountedFrame(video_frame);
 240                 card->new_data_ready_fence = fence;
 241                 card->new_data_ready_changed.notify_all();
 242         }
 243
 244         // Video frame will be released when last user of card->new_frame goes out of scope.
 245         card->usb->get_audio_frame_allocator()->release_frame(audio_frame);
 246 }
 247
 248 void Mixer::place_rectangle(Effect *resample_effect, Effect *padding_effect, float x0, float y0, float x1, float y1)
 249 {
 250         float srcx0 = 0.0f;
 251         float srcx1 = 1.0f;
 252         float srcy0 = 0.0f;
 253         float srcy1 = 1.0f;
 254
 255         // Cull.
 256         if (x0 > 1280.0 || x1 < 0.0 || y0 > 720.0 || y1 < 0.0) {
 257                 CHECK(resample_effect->set_int("width", 1));
 258                 CHECK(resample_effect->set_int("height", 1));
 259                 CHECK(resample_effect->set_float("zoom_x", 1280.0));
 260                 CHECK(resample_effect->set_float("zoom_y", 720.0));
 261                 CHECK(padding_effect->set_int("left", 2000));
 262                 CHECK(padding_effect->set_int("top", 2000));
 263                 return;
 264         }
 265
 266         // Clip. (TODO: Clip on upper/left sides, too.)
 267         if (x1 > 1280.0) {
 268                 srcx1 = (1280.0 - x0) / (x1 - x0);
 269                 x1 = 1280.0;
 270         }
 271         if (y1 > 720.0) {
 272                 srcy1 = (720.0 - y0) / (y1 - y0);
 273                 y1 = 720.0;
 274         }
 275
 276         float x_subpixel_offset = x0 - floor(x0);
 277         float y_subpixel_offset = y0 - floor(y0);
 278
 279         // Resampling must be to an integral number of pixels. Round up,
 280         // and then add an extra pixel so we have some leeway for the border.
 281         int width = int(ceil(x1 - x0)) + 1;
 282         int height = int(ceil(y1 - y0)) + 1;
 283         CHECK(resample_effect->set_int("width", width));
 284         CHECK(resample_effect->set_int("height", height));
 285
 286         // Correct the discrepancy with zoom. (This will leave a small
 287         // excess edge of pixels and subpixels, which we'll correct for soon.)
 288         float zoom_x = (x1 - x0) / (width * (srcx1 - srcx0));
 289         float zoom_y = (y1 - y0) / (height * (srcy1 - srcy0));
 290         CHECK(resample_effect->set_float("zoom_x", zoom_x));
 291         CHECK(resample_effect->set_float("zoom_y", zoom_y));
 292         CHECK(resample_effect->set_float("zoom_center_x", 0.0f));
 293         CHECK(resample_effect->set_float("zoom_center_y", 0.0f));
 294
 295         // Padding must also be to a whole-pixel offset.
 296         CHECK(padding_effect->set_int("left", floor(x0)));
 297         CHECK(padding_effect->set_int("top", floor(y0)));
 298
 299         // Correct _that_ discrepancy by subpixel offset in the resampling.
 300         CHECK(resample_effect->set_float("left", -x_subpixel_offset / zoom_x));
 301         CHECK(resample_effect->set_float("top", -y_subpixel_offset / zoom_y));
 302
 303         // Finally, adjust the border so it is exactly where we want it.
 304         CHECK(padding_effect->set_float("border_offset_left", x_subpixel_offset));
 305         CHECK(padding_effect->set_float("border_offset_right", x1 - (floor(x0) + width)));
 306         CHECK(padding_effect->set_float("border_offset_top", y_subpixel_offset));
 307         CHECK(padding_effect->set_float("border_offset_bottom", y1 - (floor(y0) + height)));
 308 }
 309
 310 void Mixer::thread_func()
 311 {
 312         eglBindAPI(EGL_OPENGL_API);
 313         QOpenGLContext *context = create_context();
 314         if (!make_current(context, mixer_surface)) {
 315                 printf("oops\n");
 316                 exit(1);
 317         }
 318
 319         struct timespec start, now;
 320         clock_gettime(CLOCK_MONOTONIC, &start);
 321
 322         while (!should_quit) {
 323                 ++frame;
 324
 325                 //int width0 = lrintf(848 * (1.0 + 0.2 * sin(frame * 0.02)));
 326                 int width0 = 848;
 327                 int height0 = lrintf(width0 * 9.0 / 16.0);
 328
 329                 //float top0 = 96 + 48 * sin(frame * 0.005);
 330                 //float left0 = 96 + 48 * cos(frame * 0.006);
 331                 float top0 = 48;
 332                 float left0 = 16;
 333                 float bottom0 = top0 + height0;
 334                 float right0 = left0 + width0;
 335
 336                 int width1 = 384;
 337                 int height1 = 216;
 338
 339                 float bottom1 = 720 - 48;
 340                 float right1 = 1280 - 16;
 341                 float top1 = bottom1 - height1;
 342                 float left1 = right1 - width1;
 343
 344                 if (current_source == SOURCE_INPUT1) {
 345                         top0 = 0.0;
 346                         bottom0 = HEIGHT;
 347                         left0 = 0.0;
 348                         right0 = WIDTH;
 349
 350                         top1 = HEIGHT + 10;
 351                         bottom1 = HEIGHT + 20;
 352                         left1 = WIDTH + 10;
 353                         right1 = WIDTH + 20;
 354                 } else if (current_source == SOURCE_INPUT2) {
 355                         top1 = 0.0;
 356                         bottom1 = HEIGHT;
 357                         left1 = 0.0;
 358                         right1 = WIDTH;
 359
 360                         top0 = HEIGHT + 10;
 361                         bottom0 = HEIGHT + 20;
 362                         left0 = WIDTH + 10;
 363                         right0 = WIDTH + 20;
 364                 } else {
 365                         float t = 0.5 + 0.5 * cos(frame * 0.006);
 366                         float scale0 = 1.0 + t * (1280.0 / 848.0 - 1.0);
 367                         float tx0 = 0.0 + t * (-16.0 * scale0);
 368                         float ty0 = 0.0 + t * (-48.0 * scale0);
 369
 370                         top0 = top0 * scale0 + ty0;
 371                         bottom0 = bottom0 * scale0 + ty0;
 372                         left0 = left0 * scale0 + tx0;
 373                         right0 = right0 * scale0 + tx0;
 374
 375                         top1 = top1 * scale0 + ty0;
 376                         bottom1 = bottom1 * scale0 + ty0;
 377                         left1 = left1 * scale0 + tx0;
 378                         right1 = right1 * scale0 + tx0;
 379                 }
 380
 381                 place_rectangle(resample_effect, padding_effect, left0, top0, right0, bottom0);
 382                 place_rectangle(resample2_effect, padding2_effect, left1, top1, right1, bottom1);
 383
 384                 CaptureCard card_copy[NUM_CARDS];
 385
 386                 {
 387                         std::unique_lock<std::mutex> lock(bmusb_mutex);
 388
 389                         // The first card is the master timer, so wait for it to have a new frame.
 390                         // TODO: Make configurable, and with a timeout.
 391                         cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
 392
 393                         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 394                                 CaptureCard *card = &cards[card_index];
 395                                 card_copy[card_index].usb = card->usb;
 396                                 card_copy[card_index].new_data_ready = card->new_data_ready;
 397                                 card_copy[card_index].new_frame = card->new_frame;
 398                                 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
 399                                 card->new_data_ready = false;
 400                                 card->new_data_ready_changed.notify_all();
 401                         }
 402                 }
 403
 404                 for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 405                         CaptureCard *card = &card_copy[card_index];
 406                         if (!card->new_data_ready)
 407                                 continue;
 408
 409                         bmusb_current_rendering_frame[card_index] = card->new_frame;
 410                         check_error();
 411
 412                         // The new texture might still be uploaded,
 413                         // tell the GPU to wait until it's there.
 414                         if (card->new_data_ready_fence)
 415                                 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
 416                         check_error();
 417                         glDeleteSync(card->new_data_ready_fence);
 418                         check_error();
 419                         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
 420                         input[card_index]->set_texture_num(0, userdata->tex_y);
 421                         input[card_index]->set_texture_num(1, userdata->tex_cbcr);
 422
 423                         if (NUM_CARDS == 1) {
 424                                 // Set to the other one, too.
 425                                 input[1]->set_texture_num(0, userdata->tex_y);
 426                                 input[1]->set_texture_num(1, userdata->tex_cbcr);
 427                         }
 428                 }
 429
 430                 GLuint y_tex, cbcr_tex;
 431                 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
 432                 assert(got_frame);
 433
 434                 // Render main chain.
 435                 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
 436                 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT);  // Saves texture bandwidth, although dithering gets messed up.
 437                 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
 438                 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
 439                 resource_pool->release_fbo(fbo);
 440
 441                 subsample_chroma(cbcr_full_tex, cbcr_tex);
 442                 resource_pool->release_2d_texture(cbcr_full_tex);
 443
 444                 // Set the right state for rgba_tex.
 445                 glBindFramebuffer(GL_FRAMEBUFFER, 0);
 446                 glBindTexture(GL_TEXTURE_2D, rgba_tex);
 447                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 448                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 449                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 450
 451                 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 452                 check_error();
 453
 454                 // Make sure the H.264 gets a reference to all the
 455                 // input frames needed, so that they are not released back
 456                 // until the rendering is done.
 457                 vector<RefCountedFrame> input_frames;
 458                 for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 459                         input_frames.push_back(bmusb_current_rendering_frame[card_index]);
 460                 }
 461                 h264_encoder->end_frame(fence, input_frames);
 462
 463                 // The live frame just shows the RGBA texture we just rendered.
 464                 // It owns rgba_tex now.
 465                 DisplayFrame live_frame;
 466                 live_frame.chain = display_chain.get();
 467                 live_frame.setup_chain = [this, rgba_tex]{
 468                         display_input->set_texture_num(rgba_tex);
 469                 };
 470                 live_frame.ready_fence = fence;
 471                 live_frame.input_frames = {};
 472                 live_frame.temp_textures = { rgba_tex };
 473                 output_channel[OUTPUT_LIVE].output_frame(live_frame);
 474
 475                 // The preview frame shows the first input. Note that the textures
 476                 // are owned by the input frame, not the display frame.
 477                 const PBOFrameAllocator::Userdata *input0_userdata = (const PBOFrameAllocator::Userdata *)bmusb_current_rendering_frame[0]->userdata;
 478                 GLuint input0_y_tex = input0_userdata->tex_y;
 479                 GLuint input0_cbcr_tex = input0_userdata->tex_cbcr;
 480                 DisplayFrame preview_frame;
 481                 preview_frame.chain = preview_chain.get();
 482                 preview_frame.setup_chain = [this, input0_y_tex, input0_cbcr_tex]{
 483                         preview_input->set_texture_num(0, input0_y_tex);
 484                         preview_input->set_texture_num(1, input0_cbcr_tex);
 485                 };
 486                 preview_frame.ready_fence = fence;
 487                 preview_frame.input_frames = { bmusb_current_rendering_frame[0] };
 488                 preview_frame.temp_textures = {};
 489                 output_channel[OUTPUT_PREVIEW].output_frame(preview_frame);
 490
 491                 clock_gettime(CLOCK_MONOTONIC, &now);
 492                 double elapsed = now.tv_sec - start.tv_sec +
 493                         1e-9 * (now.tv_nsec - start.tv_nsec);
 494                 if (frame % 100 == 0) {
 495                         printf("%d frames in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
 496                                 frame, elapsed, frame / elapsed,
 497                                 1e3 * elapsed / frame);
 498                 //      chain->print_phase_timing();
 499                 }
 500
 501                 // Reset every 100 frames, so that local variations in frame times
 502                 // (especially for the first few frames, when the shaders are
 503                 // compiled etc.) don't make it hard to measure for the entire
 504                 // remaining duration of the program.
 505                 if (frame == 10000) {
 506                         frame = 0;
 507                         start = now;
 508                 }
 509                 check_error();
 510         }
 511 }
 512
 513 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
 514 {
 515         GLuint vao;
 516         glGenVertexArrays(1, &vao);
 517         check_error();
 518
 519         float vertices[] = {
 520                 0.0f, 2.0f,
 521                 0.0f, 0.0f,
 522                 2.0f, 0.0f
 523         };
 524
 525         glBindVertexArray(vao);
 526         check_error();
 527
 528         // Extract Cb/Cr.
 529         GLuint fbo = resource_pool->create_fbo(dst_tex);
 530         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 531         glViewport(0, 0, WIDTH/2, HEIGHT/2);
 532         check_error();
 533
 534         glUseProgram(cbcr_program_num);
 535         check_error();
 536
 537         glActiveTexture(GL_TEXTURE0);
 538         check_error();
 539         glBindTexture(GL_TEXTURE_2D, src_tex);
 540         check_error();
 541         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 542         check_error();
 543         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 544         check_error();
 545         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 546         check_error();
 547
 548         float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
 549         set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
 550
 551         GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
 552         GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
 553
 554         glDrawArrays(GL_TRIANGLES, 0, 3);
 555         check_error();
 556
 557         cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
 558         cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
 559
 560         glUseProgram(0);
 561         check_error();
 562
 563         resource_pool->release_fbo(fbo);
 564         glDeleteVertexArrays(1, &vao);
 565 }
 566
 567 void Mixer::release_display_frame(DisplayFrame *frame)
 568 {
 569         for (GLuint texnum : frame->temp_textures) {
 570                 resource_pool->release_2d_texture(texnum);
 571         }
 572         frame->temp_textures.clear();
 573         frame->ready_fence.reset();
 574         frame->input_frames.clear();
 575 }
 576
 577 void Mixer::start()
 578 {
 579         mixer_thread = std::thread(&Mixer::thread_func, this);
 580 }
 581
 582 void Mixer::quit()
 583 {
 584         should_quit = true;
 585         mixer_thread.join();
 586 }
 587
 588 void Mixer::cut(Source source)
 589 {
 590         current_source = source;
 591 }
 592
 593 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
 594 {
 595         // Store this frame for display. Remove the ready frame if any
 596         // (it was seemingly never used).
 597         {
 598                 std::unique_lock<std::mutex> lock(frame_mutex);
 599                 if (has_ready_frame) {
 600                         parent->release_display_frame(&ready_frame);
 601                 }
 602                 ready_frame = frame;
 603                 has_ready_frame = true;
 604         }
 605
 606         if (has_new_frame_ready_callback) {
 607                 new_frame_ready_callback();
 608         }
 609 }
 610
 611 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
 612 {
 613         std::unique_lock<std::mutex> lock(frame_mutex);
 614         if (!has_current_frame && !has_ready_frame) {
 615                 return false;
 616         }
 617
 618         if (has_current_frame && has_ready_frame) {
 619                 // We have a new ready frame. Toss the current one.
 620                 parent->release_display_frame(&current_frame);
 621                 has_current_frame = false;
 622         }
 623         if (has_ready_frame) {
 624                 assert(!has_current_frame);
 625                 current_frame = ready_frame;
 626                 ready_frame.ready_fence.reset();  // Drop the refcount.
 627                 ready_frame.input_frames.clear();  // Drop the refcounts.
 628                 has_current_frame = true;
 629                 has_ready_frame = false;
 630         }
 631
 632         *frame = current_frame;
 633         return true;
 634 }
 635
 636 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
 637 {
 638         new_frame_ready_callback = callback;
 639         has_new_frame_ready_callback = true;
 640 }
 641
 642 void Mixer::OutputChannel::set_size(int width, int height)
 643 {
 644         this->width = width;
 645         this->height = height;
 646 }