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         theme.reset(new Theme("theme.lua", resource_pool.get()));
  62         output_channel[OUTPUT_LIVE].parent = this;
  63         output_channel[OUTPUT_PREVIEW].parent = this;
  64         output_channel[OUTPUT_INPUT0].parent = this;
  65         output_channel[OUTPUT_INPUT1].parent = this;
  66
  67         ImageFormat inout_format;
  68         inout_format.color_space = COLORSPACE_sRGB;
  69         inout_format.gamma_curve = GAMMA_sRGB;
  70
  71         // Display chain; shows the live output produced by the main chain (its RGBA version).
  72         display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
  73         check_error();
  74         display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT);  // FIXME: GL_UNSIGNED_BYTE is really wrong.
  75         display_chain->add_input(display_input);
  76         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
  77         display_chain->set_dither_bits(0);  // Don't bother.
  78         display_chain->finalize();
  79
  80         h264_encoder.reset(new H264Encoder(h264_encoder_surface, WIDTH, HEIGHT, "test.mp4"));
  81
  82         printf("Configuring first card...\n");
  83         cards[0].usb = new BMUSBCapture(0x1edb, 0xbd3b);  // 0xbd4f
  84         cards[0].usb->set_frame_callback(std::bind(&Mixer::bm_frame, this, 0, _1, _2, _3, _4, _5, _6, _7));
  85         cards[0].frame_allocator.reset(new PBOFrameAllocator(1280 * 750 * 2 + 44, 1280, 720));
  86         cards[0].usb->set_video_frame_allocator(cards[0].frame_allocator.get());
  87         cards[0].usb->configure_card();
  88         cards[0].surface = create_surface(format);
  89 #if NUM_CARDS == 2
  90         cards[1].surface = create_surface(format);
  91 #endif
  92
  93         if (NUM_CARDS == 2) {
  94                 printf("Configuring second card...\n");
  95                 cards[1].usb = new BMUSBCapture(0x1edb, 0xbd4f);
  96                 cards[1].usb->set_frame_callback(std::bind(&Mixer::bm_frame, this, 1, _1, _2, _3, _4, _5, _6, _7));
  97                 cards[1].frame_allocator.reset(new PBOFrameAllocator(1280 * 750 * 2 + 44, 1280, 720));
  98                 cards[1].usb->set_video_frame_allocator(cards[1].frame_allocator.get());
  99                 cards[1].usb->configure_card();
 100         }
 101
 102         BMUSBCapture::start_bm_thread();
 103
 104         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 105                 cards[card_index].usb->start_bm_capture();
 106         }
 107
 108         //chain->enable_phase_timing(true);
 109
 110         // Set up stuff for NV12 conversion.
 111
 112         // Cb/Cr shader.
 113         string cbcr_vert_shader = read_file("vs-cbcr.130.vert");
 114         string cbcr_frag_shader =
 115                 "#version 130 \n"
 116                 "in vec2 tc0; \n"
 117                 "uniform sampler2D cbcr_tex; \n"
 118                 "void main() { \n"
 119                 "    gl_FragColor = texture2D(cbcr_tex, tc0); \n"
 120                 "} \n";
 121         cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader);
 122 }
 123
 124 Mixer::~Mixer()
 125 {
 126         resource_pool->release_glsl_program(cbcr_program_num);
 127         BMUSBCapture::stop_bm_thread();
 128 }
 129
 130 void Mixer::bm_frame(int card_index, uint16_t timecode,
 131                      FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 132                      FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
 133 {
 134         CaptureCard *card = &cards[card_index];
 135         if (!card->thread_initialized) {
 136                 printf("initializing context for bmusb thread %d\n", card_index);
 137                 eglBindAPI(EGL_OPENGL_API);
 138                 card->context = create_context();
 139                 if (!make_current(card->context, card->surface)) {
 140                         printf("failed to create bmusb context\n");
 141                         exit(1);
 142                 }
 143                 card->thread_initialized = true;
 144         }
 145
 146         if (video_frame.len - video_offset != 1280 * 750 * 2) {
 147                 printf("dropping frame with wrong length (%ld)\n", video_frame.len - video_offset);
 148                 FILE *fp = fopen("frame.raw", "wb");
 149                 fwrite(video_frame.data, video_frame.len, 1, fp);
 150                 fclose(fp);
 151                 //exit(1);
 152                 card->usb->get_video_frame_allocator()->release_frame(video_frame);
 153                 card->usb->get_audio_frame_allocator()->release_frame(audio_frame);
 154                 return;
 155         }
 156         {
 157                 // Wait until the previous frame was consumed.
 158                 std::unique_lock<std::mutex> lock(bmusb_mutex);
 159                 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready; });
 160         }
 161         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
 162         GLuint pbo = userdata->pbo;
 163         check_error();
 164         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
 165         check_error();
 166         glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
 167         check_error();
 168         //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
 169         //check_error();
 170
 171         // Upload the textures.
 172         glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
 173         check_error();
 174         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1280, 720, GL_RED, GL_UNSIGNED_BYTE, BUFFER_OFFSET((1280 * 750 * 2 + 44) / 2 + 1280 * 25 + 22));
 175         check_error();
 176         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
 177         check_error();
 178         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1280/2, 720, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(1280 * 25 + 22));
 179         check_error();
 180         glBindTexture(GL_TEXTURE_2D, 0);
 181         check_error();
 182         GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 183         check_error();
 184         assert(fence != nullptr);
 185         {
 186                 std::unique_lock<std::mutex> lock(bmusb_mutex);
 187                 card->new_data_ready = true;
 188                 card->new_frame = RefCountedFrame(video_frame);
 189                 card->new_data_ready_fence = fence;
 190                 card->new_data_ready_changed.notify_all();
 191         }
 192
 193         // Video frame will be released when last user of card->new_frame goes out of scope.
 194         card->usb->get_audio_frame_allocator()->release_frame(audio_frame);
 195 }
 196
 197 void Mixer::place_rectangle(Effect *resample_effect, Effect *padding_effect, float x0, float y0, float x1, float y1)
 198 {
 199         float srcx0 = 0.0f;
 200         float srcx1 = 1.0f;
 201         float srcy0 = 0.0f;
 202         float srcy1 = 1.0f;
 203
 204         // Cull.
 205         if (x0 > 1280.0 || x1 < 0.0 || y0 > 720.0 || y1 < 0.0) {
 206                 CHECK(resample_effect->set_int("width", 1));
 207                 CHECK(resample_effect->set_int("height", 1));
 208                 CHECK(resample_effect->set_float("zoom_x", 1280.0));
 209                 CHECK(resample_effect->set_float("zoom_y", 720.0));
 210                 CHECK(padding_effect->set_int("left", 2000));
 211                 CHECK(padding_effect->set_int("top", 2000));
 212                 return;
 213         }
 214
 215         // Clip. (TODO: Clip on upper/left sides, too.)
 216         if (x1 > 1280.0) {
 217                 srcx1 = (1280.0 - x0) / (x1 - x0);
 218                 x1 = 1280.0;
 219         }
 220         if (y1 > 720.0) {
 221                 srcy1 = (720.0 - y0) / (y1 - y0);
 222                 y1 = 720.0;
 223         }
 224
 225         float x_subpixel_offset = x0 - floor(x0);
 226         float y_subpixel_offset = y0 - floor(y0);
 227
 228         // Resampling must be to an integral number of pixels. Round up,
 229         // and then add an extra pixel so we have some leeway for the border.
 230         int width = int(ceil(x1 - x0)) + 1;
 231         int height = int(ceil(y1 - y0)) + 1;
 232         CHECK(resample_effect->set_int("width", width));
 233         CHECK(resample_effect->set_int("height", height));
 234
 235         // Correct the discrepancy with zoom. (This will leave a small
 236         // excess edge of pixels and subpixels, which we'll correct for soon.)
 237         float zoom_x = (x1 - x0) / (width * (srcx1 - srcx0));
 238         float zoom_y = (y1 - y0) / (height * (srcy1 - srcy0));
 239         CHECK(resample_effect->set_float("zoom_x", zoom_x));
 240         CHECK(resample_effect->set_float("zoom_y", zoom_y));
 241         CHECK(resample_effect->set_float("zoom_center_x", 0.0f));
 242         CHECK(resample_effect->set_float("zoom_center_y", 0.0f));
 243
 244         // Padding must also be to a whole-pixel offset.
 245         CHECK(padding_effect->set_int("left", floor(x0)));
 246         CHECK(padding_effect->set_int("top", floor(y0)));
 247
 248         // Correct _that_ discrepancy by subpixel offset in the resampling.
 249         CHECK(resample_effect->set_float("left", -x_subpixel_offset / zoom_x));
 250         CHECK(resample_effect->set_float("top", -y_subpixel_offset / zoom_y));
 251
 252         // Finally, adjust the border so it is exactly where we want it.
 253         CHECK(padding_effect->set_float("border_offset_left", x_subpixel_offset));
 254         CHECK(padding_effect->set_float("border_offset_right", x1 - (floor(x0) + width)));
 255         CHECK(padding_effect->set_float("border_offset_top", y_subpixel_offset));
 256         CHECK(padding_effect->set_float("border_offset_bottom", y1 - (floor(y0) + height)));
 257 }
 258
 259 void Mixer::thread_func()
 260 {
 261         eglBindAPI(EGL_OPENGL_API);
 262         QOpenGLContext *context = create_context();
 263         if (!make_current(context, mixer_surface)) {
 264                 printf("oops\n");
 265                 exit(1);
 266         }
 267
 268         struct timespec start, now;
 269         clock_gettime(CLOCK_MONOTONIC, &start);
 270
 271         while (!should_quit) {
 272                 ++frame;
 273
 274 #if 0
 275                 //int width0 = lrintf(848 * (1.0 + 0.2 * sin(frame * 0.02)));
 276                 int width0 = 848;
 277                 int height0 = lrintf(width0 * 9.0 / 16.0);
 278
 279                 //float top0 = 96 + 48 * sin(frame * 0.005);
 280                 //float left0 = 96 + 48 * cos(frame * 0.006);
 281                 float top0 = 48;
 282                 float left0 = 16;
 283                 float bottom0 = top0 + height0;
 284                 float right0 = left0 + width0;
 285
 286                 int width1 = 384;
 287                 int height1 = 216;
 288
 289                 float bottom1 = 720 - 48;
 290                 float right1 = 1280 - 16;
 291                 float top1 = bottom1 - height1;
 292                 float left1 = right1 - width1;
 293
 294                 if (current_source == SOURCE_INPUT1) {
 295                         top0 = 0.0;
 296                         bottom0 = HEIGHT;
 297                         left0 = 0.0;
 298                         right0 = WIDTH;
 299
 300                         top1 = HEIGHT + 10;
 301                         bottom1 = HEIGHT + 20;
 302                         left1 = WIDTH + 10;
 303                         right1 = WIDTH + 20;
 304                 } else if (current_source == SOURCE_INPUT2) {
 305                         top1 = 0.0;
 306                         bottom1 = HEIGHT;
 307                         left1 = 0.0;
 308                         right1 = WIDTH;
 309
 310                         top0 = HEIGHT + 10;
 311                         bottom0 = HEIGHT + 20;
 312                         left0 = WIDTH + 10;
 313                         right0 = WIDTH + 20;
 314                 } else {
 315                         float t = 0.5 + 0.5 * cos(frame * 0.006);
 316                         float scale0 = 1.0 + t * (1280.0 / 848.0 - 1.0);
 317                         float tx0 = 0.0 + t * (-16.0 * scale0);
 318                         float ty0 = 0.0 + t * (-48.0 * scale0);
 319
 320                         top0 = top0 * scale0 + ty0;
 321                         bottom0 = bottom0 * scale0 + ty0;
 322                         left0 = left0 * scale0 + tx0;
 323                         right0 = right0 * scale0 + tx0;
 324
 325                         top1 = top1 * scale0 + ty0;
 326                         bottom1 = bottom1 * scale0 + ty0;
 327                         left1 = left1 * scale0 + tx0;
 328                         right1 = right1 * scale0 + tx0;
 329                 }
 330
 331                 place_rectangle(resample_effect, padding_effect, left0, top0, right0, bottom0);
 332                 place_rectangle(resample2_effect, padding2_effect, left1, top1, right1, bottom1);
 333 #endif
 334
 335                 CaptureCard card_copy[NUM_CARDS];
 336
 337                 {
 338                         std::unique_lock<std::mutex> lock(bmusb_mutex);
 339
 340                         // The first card is the master timer, so wait for it to have a new frame.
 341                         // TODO: Make configurable, and with a timeout.
 342                         cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
 343
 344                         for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 345                                 CaptureCard *card = &cards[card_index];
 346                                 card_copy[card_index].usb = card->usb;
 347                                 card_copy[card_index].new_data_ready = card->new_data_ready;
 348                                 card_copy[card_index].new_frame = card->new_frame;
 349                                 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
 350                                 card->new_data_ready = false;
 351                                 card->new_data_ready_changed.notify_all();
 352                         }
 353                 }
 354
 355                 for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 356                         CaptureCard *card = &card_copy[card_index];
 357                         if (!card->new_data_ready)
 358                                 continue;
 359
 360                         assert(card->new_frame != nullptr);
 361                         bmusb_current_rendering_frame[card_index] = card->new_frame;
 362                         check_error();
 363
 364                         // The new texture might still be uploaded,
 365                         // tell the GPU to wait until it's there.
 366                         if (card->new_data_ready_fence)
 367                                 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
 368                         check_error();
 369                         glDeleteSync(card->new_data_ready_fence);
 370                         check_error();
 371                         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
 372                         theme->set_input_textures(card_index, userdata->tex_y, userdata->tex_cbcr);
 373                 }
 374
 375                 // Get the main chain from the theme, and set its state immediately.
 376                 pair<EffectChain *, function<void()>> theme_main_chain = theme->get_chain(0, frame / 60.0f, WIDTH, HEIGHT);
 377                 EffectChain *chain = theme_main_chain.first;
 378                 theme_main_chain.second();
 379
 380                 GLuint y_tex, cbcr_tex;
 381                 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
 382                 assert(got_frame);
 383
 384                 // Render main chain.
 385                 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
 386                 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT);  // Saves texture bandwidth, although dithering gets messed up.
 387                 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
 388                 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
 389                 resource_pool->release_fbo(fbo);
 390
 391                 subsample_chroma(cbcr_full_tex, cbcr_tex);
 392                 resource_pool->release_2d_texture(cbcr_full_tex);
 393
 394                 // Set the right state for rgba_tex.
 395                 glBindFramebuffer(GL_FRAMEBUFFER, 0);
 396                 glBindTexture(GL_TEXTURE_2D, rgba_tex);
 397                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 398                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 399                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 400
 401                 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 402                 check_error();
 403
 404                 // Make sure the H.264 gets a reference to all the
 405                 // input frames needed, so that they are not released back
 406                 // until the rendering is done.
 407                 vector<RefCountedFrame> input_frames;
 408                 for (int card_index = 0; card_index < NUM_CARDS; ++card_index) {
 409                         input_frames.push_back(bmusb_current_rendering_frame[card_index]);
 410                 }
 411                 h264_encoder->end_frame(fence, input_frames);
 412
 413                 // The live frame just shows the RGBA texture we just rendered.
 414                 // It owns rgba_tex now.
 415                 DisplayFrame live_frame;
 416                 live_frame.chain = display_chain.get();
 417                 live_frame.setup_chain = [this, rgba_tex]{
 418                         display_input->set_texture_num(rgba_tex);
 419                 };
 420                 live_frame.ready_fence = fence;
 421                 live_frame.input_frames = {};
 422                 live_frame.temp_textures = { rgba_tex };
 423                 output_channel[OUTPUT_LIVE].output_frame(live_frame);
 424
 425                 // Set up preview and any additional channels.
 426                 for (unsigned i = 1; i < theme->get_num_channels() + 2; ++i) {
 427                         DisplayFrame display_frame;
 428                         pair<EffectChain *, function<void()>> chain = theme->get_chain(i, frame / 60.0f, WIDTH, HEIGHT);  // FIXME: dimensions
 429                         display_frame.chain = chain.first;
 430                         display_frame.setup_chain = chain.second;
 431                         display_frame.ready_fence = fence;
 432                         display_frame.input_frames = { bmusb_current_rendering_frame[0], bmusb_current_rendering_frame[1] };  // FIXME: possible to do better?
 433                         display_frame.temp_textures = {};
 434                         output_channel[i].output_frame(display_frame);
 435                 }
 436
 437                 clock_gettime(CLOCK_MONOTONIC, &now);
 438                 double elapsed = now.tv_sec - start.tv_sec +
 439                         1e-9 * (now.tv_nsec - start.tv_nsec);
 440                 if (frame % 100 == 0) {
 441                         printf("%d frames in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
 442                                 frame, elapsed, frame / elapsed,
 443                                 1e3 * elapsed / frame);
 444                 //      chain->print_phase_timing();
 445                 }
 446
 447                 // Reset every 100 frames, so that local variations in frame times
 448                 // (especially for the first few frames, when the shaders are
 449                 // compiled etc.) don't make it hard to measure for the entire
 450                 // remaining duration of the program.
 451                 if (frame == 10000) {
 452                         frame = 0;
 453                         start = now;
 454                 }
 455                 check_error();
 456         }
 457 }
 458
 459 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
 460 {
 461         GLuint vao;
 462         glGenVertexArrays(1, &vao);
 463         check_error();
 464
 465         float vertices[] = {
 466                 0.0f, 2.0f,
 467                 0.0f, 0.0f,
 468                 2.0f, 0.0f
 469         };
 470
 471         glBindVertexArray(vao);
 472         check_error();
 473
 474         // Extract Cb/Cr.
 475         GLuint fbo = resource_pool->create_fbo(dst_tex);
 476         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 477         glViewport(0, 0, WIDTH/2, HEIGHT/2);
 478         check_error();
 479
 480         glUseProgram(cbcr_program_num);
 481         check_error();
 482
 483         glActiveTexture(GL_TEXTURE0);
 484         check_error();
 485         glBindTexture(GL_TEXTURE_2D, src_tex);
 486         check_error();
 487         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 488         check_error();
 489         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 490         check_error();
 491         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 492         check_error();
 493
 494         float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
 495         set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
 496
 497         GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
 498         GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
 499
 500         glDrawArrays(GL_TRIANGLES, 0, 3);
 501         check_error();
 502
 503         cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
 504         cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
 505
 506         glUseProgram(0);
 507         check_error();
 508
 509         resource_pool->release_fbo(fbo);
 510         glDeleteVertexArrays(1, &vao);
 511 }
 512
 513 void Mixer::release_display_frame(DisplayFrame *frame)
 514 {
 515         for (GLuint texnum : frame->temp_textures) {
 516                 resource_pool->release_2d_texture(texnum);
 517         }
 518         frame->temp_textures.clear();
 519         frame->ready_fence.reset();
 520         frame->input_frames.clear();
 521 }
 522
 523 void Mixer::start()
 524 {
 525         mixer_thread = std::thread(&Mixer::thread_func, this);
 526 }
 527
 528 void Mixer::quit()
 529 {
 530         should_quit = true;
 531         mixer_thread.join();
 532 }
 533
 534 void Mixer::transition_clicked(int transition_num, float t)
 535 {
 536         theme->transition_clicked(transition_num, t);
 537 }
 538
 539 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
 540 {
 541         // Store this frame for display. Remove the ready frame if any
 542         // (it was seemingly never used).
 543         {
 544                 std::unique_lock<std::mutex> lock(frame_mutex);
 545                 if (has_ready_frame) {
 546                         parent->release_display_frame(&ready_frame);
 547                 }
 548                 ready_frame = frame;
 549                 has_ready_frame = true;
 550         }
 551
 552         if (has_new_frame_ready_callback) {
 553                 new_frame_ready_callback();
 554         }
 555 }
 556
 557 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
 558 {
 559         std::unique_lock<std::mutex> lock(frame_mutex);
 560         if (!has_current_frame && !has_ready_frame) {
 561                 return false;
 562         }
 563
 564         if (has_current_frame && has_ready_frame) {
 565                 // We have a new ready frame. Toss the current one.
 566                 parent->release_display_frame(&current_frame);
 567                 has_current_frame = false;
 568         }
 569         if (has_ready_frame) {
 570                 assert(!has_current_frame);
 571                 current_frame = ready_frame;
 572                 ready_frame.ready_fence.reset();  // Drop the refcount.
 573                 ready_frame.input_frames.clear();  // Drop the refcounts.
 574                 has_current_frame = true;
 575                 has_ready_frame = false;
 576         }
 577
 578         *frame = current_frame;
 579         return true;
 580 }
 581
 582 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
 583 {
 584         new_frame_ready_callback = callback;
 585         has_new_frame_ready_callback = true;
 586 }