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, unsigned num_cards)
  74         : httpd("test.ts", WIDTH, HEIGHT),
  75           num_cards(num_cards),
  76           mixer_surface(create_surface(format)),
  77           h264_encoder_surface(create_surface(format))
  78 {
  79         httpd.start(9095);
  80
  81         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
  82         check_error();
  83
  84         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
  85         // will be halved when sampling them, and we need to compensate here.
  86         movit_texel_subpixel_precision /= 2.0;
  87
  88         resource_pool.reset(new ResourcePool);
  89         theme.reset(new Theme("theme.lua", resource_pool.get(), num_cards));
  90         output_channel[OUTPUT_LIVE].parent = this;
  91         output_channel[OUTPUT_PREVIEW].parent = this;
  92         output_channel[OUTPUT_INPUT0].parent = this;
  93         output_channel[OUTPUT_INPUT1].parent = this;
  94
  95         ImageFormat inout_format;
  96         inout_format.color_space = COLORSPACE_sRGB;
  97         inout_format.gamma_curve = GAMMA_sRGB;
  98
  99         // Display chain; shows the live output produced by the main chain (its RGBA version).
 100         display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
 101         check_error();
 102         display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT);  // FIXME: GL_UNSIGNED_BYTE is really wrong.
 103         display_chain->add_input(display_input);
 104         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
 105         display_chain->set_dither_bits(0);  // Don't bother.
 106         display_chain->finalize();
 107
 108         h264_encoder.reset(new H264Encoder(h264_encoder_surface, WIDTH, HEIGHT, &httpd));
 109
 110         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 111                 printf("Configuring card %d...\n", card_index);
 112                 CaptureCard *card = &cards[card_index];
 113                 card->usb = new BMUSBCapture(card_index);
 114                 card->usb->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 115                 card->frame_allocator.reset(new PBOFrameAllocator(WIDTH * (HEIGHT+EXTRAHEIGHT) * 2 + 44, WIDTH, HEIGHT));
 116                 card->usb->set_video_frame_allocator(card->frame_allocator.get());
 117                 card->surface = create_surface(format);
 118                 card->usb->set_dequeue_thread_callbacks(
 119                         [card]{
 120                                 eglBindAPI(EGL_OPENGL_API);
 121                                 card->context = create_context();
 122                                 if (!make_current(card->context, card->surface)) {
 123                                         printf("failed to create bmusb context\n");
 124                                         exit(1);
 125                                 }
 126                         },
 127                         [this]{
 128                                 resource_pool->clean_context();
 129                         });
 130                 card->resampler.reset(new Resampler(48000.0, 48000.0, 2));
 131                 card->usb->configure_card();
 132         }
 133
 134         BMUSBCapture::start_bm_thread();
 135
 136         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 137                 cards[card_index].usb->start_bm_capture();
 138         }
 139
 140         //chain->enable_phase_timing(true);
 141
 142         // Set up stuff for NV12 conversion.
 143
 144         // Cb/Cr shader.
 145         string cbcr_vert_shader = read_file("vs-cbcr.130.vert");
 146         string cbcr_frag_shader =
 147                 "#version 130 \n"
 148                 "in vec2 tc0; \n"
 149                 "uniform sampler2D cbcr_tex; \n"
 150                 "void main() { \n"
 151                 "    gl_FragColor = texture2D(cbcr_tex, tc0); \n"
 152                 "} \n";
 153         cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader);
 154
 155         r128.init(2, 48000);
 156         r128.integr_start();
 157 }
 158
 159 Mixer::~Mixer()
 160 {
 161         resource_pool->release_glsl_program(cbcr_program_num);
 162         BMUSBCapture::stop_bm_thread();
 163
 164         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 165                 {
 166                         unique_lock<mutex> lock(bmusb_mutex);
 167                         cards[card_index].should_quit = true;  // Unblock thread.
 168                         cards[card_index].new_data_ready_changed.notify_all();
 169                 }
 170                 cards[card_index].usb->stop_dequeue_thread();
 171         }
 172 }
 173
 174 namespace {
 175
 176 int unwrap_timecode(uint16_t current_wrapped, int last)
 177 {
 178         uint16_t last_wrapped = last & 0xffff;
 179         if (current_wrapped > last_wrapped) {
 180                 return (last & ~0xffff) | current_wrapped;
 181         } else {
 182                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 183         }
 184 }
 185
 186 float find_peak(const vector<float> &samples)
 187 {
 188         float m = fabs(samples[0]);
 189         for (size_t i = 1; i < samples.size(); ++i) {
 190                 m = std::max(m, fabs(samples[i]));
 191         }
 192         return m;
 193 }
 194
 195 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
 196 {
 197         size_t num_samples = in.size() / 2;
 198         out_l->resize(num_samples);
 199         out_r->resize(num_samples);
 200
 201         const float *inptr = in.data();
 202         float *lptr = &(*out_l)[0];
 203         float *rptr = &(*out_r)[0];
 204         for (size_t i = 0; i < num_samples; ++i) {
 205                 *lptr++ = *inptr++;
 206                 *rptr++ = *inptr++;
 207         }
 208 }
 209
 210 }  // namespace
 211
 212 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 213                      FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 214                      FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
 215 {
 216         CaptureCard *card = &cards[card_index];
 217
 218         if (audio_frame.len - audio_offset > 30000) {
 219                 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",
 220                         card_index, int(audio_frame.len), int(audio_offset),
 221                         timecode, int(video_frame.len), int(video_offset), video_format);
 222                 if (video_frame.owner) {
 223                         video_frame.owner->release_frame(video_frame);
 224                 }
 225                 if (audio_frame.owner) {
 226                         audio_frame.owner->release_frame(audio_frame);
 227                 }
 228                 return;
 229         }
 230
 231         int unwrapped_timecode = timecode;
 232         int dropped_frames = 0;
 233         if (card->last_timecode != -1) {
 234                 unwrapped_timecode = unwrap_timecode(unwrapped_timecode, card->last_timecode);
 235                 dropped_frames = unwrapped_timecode - card->last_timecode - 1;
 236         }
 237         card->last_timecode = unwrapped_timecode;
 238
 239         // Convert the audio to stereo fp32 and add it.
 240         size_t num_samples = (audio_frame.len >= audio_offset) ? (audio_frame.len - audio_offset) / 8 / 3 : 0;
 241         vector<float> audio;
 242         audio.resize(num_samples * 2);
 243         convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, 8, num_samples);
 244
 245         // Add the audio.
 246         {
 247                 unique_lock<mutex> lock(card->audio_mutex);
 248
 249                 int unwrapped_timecode = timecode;
 250                 if (dropped_frames > 60 * 2) {
 251                         fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around), resetting resampler\n",
 252                                 card_index);
 253                         card->resampler.reset(new Resampler(48000.0, 48000.0, 2));
 254                 } else if (dropped_frames > 0) {
 255                         // Insert silence as needed.
 256                         fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 257                                 card_index, dropped_frames, timecode);
 258                         vector<float> silence;
 259                         silence.resize((48000 / 60) * 2);
 260                         for (int i = 0; i < dropped_frames; ++i) {
 261                                 card->resampler->add_input_samples((unwrapped_timecode - dropped_frames + i) / 60.0, silence.data(), (48000 / 60));
 262                         }
 263                 }
 264                 card->resampler->add_input_samples(unwrapped_timecode / 60.0, audio.data(), num_samples);
 265         }
 266
 267         // Done with the audio, so release it.
 268         if (audio_frame.owner) {
 269                 audio_frame.owner->release_frame(audio_frame);
 270         }
 271
 272         {
 273                 // Wait until the previous frame was consumed.
 274                 unique_lock<mutex> lock(bmusb_mutex);
 275                 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
 276                 if (card->should_quit) return;
 277         }
 278
 279         if (video_frame.len - video_offset != WIDTH * (HEIGHT+EXTRAHEIGHT) * 2) {
 280                 if (video_frame.len != 0) {
 281                         printf("Card %d: Dropping video frame with wrong length (%ld)\n",
 282                                 card_index, video_frame.len - video_offset);
 283                 }
 284                 if (video_frame.owner) {
 285                         video_frame.owner->release_frame(video_frame);
 286                 }
 287
 288                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 289                 // so that pts can go up accordingly.
 290                 {
 291                         unique_lock<mutex> lock(bmusb_mutex);
 292                         card->new_data_ready = true;
 293                         card->new_frame = RefCountedFrame(FrameAllocator::Frame());
 294                         card->new_data_ready_fence = nullptr;
 295                         card->dropped_frames = dropped_frames;
 296                         card->new_data_ready_changed.notify_all();
 297                 }
 298                 return;
 299         }
 300
 301         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
 302         GLuint pbo = userdata->pbo;
 303         check_error();
 304         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
 305         check_error();
 306         glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
 307         check_error();
 308         //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
 309         //check_error();
 310
 311         // Upload the textures.
 312         glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
 313         check_error();
 314         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));
 315         check_error();
 316         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
 317         check_error();
 318         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, WIDTH/2, HEIGHT, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(WIDTH * 25 + 22));
 319         check_error();
 320         glBindTexture(GL_TEXTURE_2D, 0);
 321         check_error();
 322         GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 323         check_error();
 324         assert(fence != nullptr);
 325
 326         {
 327                 unique_lock<mutex> lock(bmusb_mutex);
 328                 card->new_data_ready = true;
 329                 card->new_frame = RefCountedFrame(video_frame);
 330                 card->new_data_ready_fence = fence;
 331                 card->dropped_frames = dropped_frames;
 332                 card->new_data_ready_changed.notify_all();
 333         }
 334 }
 335
 336 void Mixer::thread_func()
 337 {
 338         eglBindAPI(EGL_OPENGL_API);
 339         QOpenGLContext *context = create_context();
 340         if (!make_current(context, mixer_surface)) {
 341                 printf("oops\n");
 342                 exit(1);
 343         }
 344
 345         struct timespec start, now;
 346         clock_gettime(CLOCK_MONOTONIC, &start);
 347
 348         int frame = 0;
 349         int dropped_frames = 0;
 350
 351         while (!should_quit) {
 352                 CaptureCard card_copy[MAX_CARDS];
 353
 354                 {
 355                         unique_lock<mutex> lock(bmusb_mutex);
 356
 357                         // The first card is the master timer, so wait for it to have a new frame.
 358                         // TODO: Make configurable, and with a timeout.
 359                         cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
 360
 361                         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 362                                 CaptureCard *card = &cards[card_index];
 363                                 card_copy[card_index].usb = card->usb;
 364                                 card_copy[card_index].new_data_ready = card->new_data_ready;
 365                                 card_copy[card_index].new_frame = card->new_frame;
 366                                 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
 367                                 card_copy[card_index].new_frame_audio = move(card->new_frame_audio);
 368                                 card_copy[card_index].dropped_frames = card->dropped_frames;
 369                                 card->new_data_ready = false;
 370                                 card->new_data_ready_changed.notify_all();
 371                         }
 372                 }
 373
 374                 // Resample the audio as needed, including from previously dropped frames.
 375                 vector<float> samples_out;
 376                 // TODO: Allow using audio from the other card(s) as well.
 377                 for (unsigned frame_num = 0; frame_num < card_copy[0].dropped_frames + 1; ++frame_num) {
 378                         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 379                                 samples_out.resize((48000 / 60) * 2);
 380                                 {
 381                                         unique_lock<mutex> lock(cards[card_index].audio_mutex);
 382                                         if (!cards[card_index].resampler->get_output_samples(pts(), &samples_out[0], 48000 / 60)) {
 383                                                 printf("Card %d reported previous underrun.\n", card_index);
 384                                         }
 385                                 }
 386                                 if (card_index == 0) {
 387                                         vector<float> left, right;
 388                                         peak = std::max(peak, find_peak(samples_out));
 389                                         deinterleave_samples(samples_out, &left, &right);
 390                                         float *ptrs[] = { left.data(), right.data() };
 391                                         r128.process(left.size(), ptrs);
 392                                         h264_encoder->add_audio(pts_int, move(samples_out));
 393                                 }
 394                         }
 395                         if (frame_num != card_copy[0].dropped_frames) {
 396                                 // For dropped frames, increase the pts.
 397                                 ++dropped_frames;
 398                                 pts_int += TIMEBASE / 60;
 399                         }
 400                 }
 401
 402                 if (audio_level_callback != nullptr) {
 403                         double loudness_s = r128.loudness_S();
 404                         double loudness_i = r128.integrated();
 405                         double loudness_range_low = r128.range_min();
 406                         double loudness_range_high = r128.range_max();
 407
 408                         audio_level_callback(loudness_s, 20.0 * log10(peak),
 409                                              loudness_i, loudness_range_low, loudness_range_high);
 410                 }
 411
 412                 for (unsigned card_index = 1; card_index < num_cards; ++card_index) {
 413                         if (card_copy[card_index].new_data_ready && card_copy[card_index].new_frame->len == 0) {
 414                                 ++card_copy[card_index].dropped_frames;
 415                         }
 416                         if (card_copy[card_index].dropped_frames > 0) {
 417                                 printf("Card %u dropped %d frames before this\n",
 418                                         card_index, int(card_copy[card_index].dropped_frames));
 419                         }
 420                 }
 421
 422                 // If the first card is reporting a corrupted or otherwise dropped frame,
 423                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
 424                 if (card_copy[0].new_frame->len == 0) {
 425                         ++dropped_frames;
 426                         pts_int += TIMEBASE / 60;
 427                         continue;
 428                 }
 429
 430                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 431                         CaptureCard *card = &card_copy[card_index];
 432                         if (!card->new_data_ready || card->new_frame->len == 0)
 433                                 continue;
 434
 435                         assert(card->new_frame != nullptr);
 436                         bmusb_current_rendering_frame[card_index] = card->new_frame;
 437                         check_error();
 438
 439                         // The new texture might still be uploaded,
 440                         // tell the GPU to wait until it's there.
 441                         if (card->new_data_ready_fence) {
 442                                 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
 443                                 check_error();
 444                                 glDeleteSync(card->new_data_ready_fence);
 445                                 check_error();
 446                         }
 447                         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
 448                         theme->set_input_textures(card_index, userdata->tex_y, userdata->tex_cbcr);
 449                 }
 450
 451                 // Get the main chain from the theme, and set its state immediately.
 452                 pair<EffectChain *, function<void()>> theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT);
 453                 EffectChain *chain = theme_main_chain.first;
 454                 theme_main_chain.second();
 455
 456                 GLuint y_tex, cbcr_tex;
 457                 bool got_frame = h264_encoder->begin_frame(&y_tex, &cbcr_tex);
 458                 assert(got_frame);
 459
 460                 // Render main chain.
 461                 GLuint cbcr_full_tex = resource_pool->create_2d_texture(GL_RG8, WIDTH, HEIGHT);
 462                 GLuint rgba_tex = resource_pool->create_2d_texture(GL_RGB565, WIDTH, HEIGHT);  // Saves texture bandwidth, although dithering gets messed up.
 463                 GLuint fbo = resource_pool->create_fbo(y_tex, cbcr_full_tex, rgba_tex);
 464                 check_error();
 465                 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
 466                 resource_pool->release_fbo(fbo);
 467
 468                 subsample_chroma(cbcr_full_tex, cbcr_tex);
 469                 resource_pool->release_2d_texture(cbcr_full_tex);
 470
 471                 // Set the right state for rgba_tex.
 472                 glBindFramebuffer(GL_FRAMEBUFFER, 0);
 473                 glBindTexture(GL_TEXTURE_2D, rgba_tex);
 474                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 475                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 476                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 477
 478                 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 479                 check_error();
 480
 481                 // Make sure the H.264 gets a reference to all the
 482                 // input frames needed, so that they are not released back
 483                 // until the rendering is done.
 484                 vector<RefCountedFrame> input_frames;
 485                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 486                         input_frames.push_back(bmusb_current_rendering_frame[card_index]);
 487                 }
 488                 const int64_t av_delay = TIMEBASE / 10;  // Corresponds to the fixed delay in resampler.h. TODO: Make less hard-coded.
 489                 h264_encoder->end_frame(fence, pts_int + av_delay, input_frames);
 490                 ++frame;
 491                 pts_int += TIMEBASE / 60;
 492
 493                 // The live frame just shows the RGBA texture we just rendered.
 494                 // It owns rgba_tex now.
 495                 DisplayFrame live_frame;
 496                 live_frame.chain = display_chain.get();
 497                 live_frame.setup_chain = [this, rgba_tex]{
 498                         display_input->set_texture_num(rgba_tex);
 499                 };
 500                 live_frame.ready_fence = fence;
 501                 live_frame.input_frames = {};
 502                 live_frame.temp_textures = { rgba_tex };
 503                 output_channel[OUTPUT_LIVE].output_frame(live_frame);
 504
 505                 // Set up preview and any additional channels.
 506                 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
 507                         DisplayFrame display_frame;
 508                         pair<EffectChain *, function<void()>> chain = theme->get_chain(i, pts(), WIDTH, HEIGHT);  // FIXME: dimensions
 509                         display_frame.chain = chain.first;
 510                         display_frame.setup_chain = chain.second;
 511                         display_frame.ready_fence = fence;
 512
 513                         // FIXME: possible to do better?
 514                         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 515                                 display_frame.input_frames.push_back(bmusb_current_rendering_frame[card_index]);
 516                         }
 517                         display_frame.temp_textures = {};
 518                         output_channel[i].output_frame(display_frame);
 519                 }
 520
 521                 clock_gettime(CLOCK_MONOTONIC, &now);
 522                 double elapsed = now.tv_sec - start.tv_sec +
 523                         1e-9 * (now.tv_nsec - start.tv_nsec);
 524                 if (frame % 100 == 0) {
 525                         printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
 526                                 frame, dropped_frames, elapsed, frame / elapsed,
 527                                 1e3 * elapsed / frame);
 528                 //      chain->print_phase_timing();
 529                 }
 530
 531 #if 0
 532                 // Reset every 100 frames, so that local variations in frame times
 533                 // (especially for the first few frames, when the shaders are
 534                 // compiled etc.) don't make it hard to measure for the entire
 535                 // remaining duration of the program.
 536                 if (frame == 10000) {
 537                         frame = 0;
 538                         start = now;
 539                 }
 540 #endif
 541                 check_error();
 542         }
 543
 544         resource_pool->clean_context();
 545 }
 546
 547 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
 548 {
 549         GLuint vao;
 550         glGenVertexArrays(1, &vao);
 551         check_error();
 552
 553         float vertices[] = {
 554                 0.0f, 2.0f,
 555                 0.0f, 0.0f,
 556                 2.0f, 0.0f
 557         };
 558
 559         glBindVertexArray(vao);
 560         check_error();
 561
 562         // Extract Cb/Cr.
 563         GLuint fbo = resource_pool->create_fbo(dst_tex);
 564         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 565         glViewport(0, 0, WIDTH/2, HEIGHT/2);
 566         check_error();
 567
 568         glUseProgram(cbcr_program_num);
 569         check_error();
 570
 571         glActiveTexture(GL_TEXTURE0);
 572         check_error();
 573         glBindTexture(GL_TEXTURE_2D, src_tex);
 574         check_error();
 575         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 576         check_error();
 577         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 578         check_error();
 579         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 580         check_error();
 581
 582         float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
 583         set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
 584
 585         GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
 586         GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
 587
 588         glDrawArrays(GL_TRIANGLES, 0, 3);
 589         check_error();
 590
 591         cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
 592         cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
 593
 594         glUseProgram(0);
 595         check_error();
 596
 597         resource_pool->release_fbo(fbo);
 598         glDeleteVertexArrays(1, &vao);
 599 }
 600
 601 void Mixer::release_display_frame(DisplayFrame *frame)
 602 {
 603         for (GLuint texnum : frame->temp_textures) {
 604                 resource_pool->release_2d_texture(texnum);
 605         }
 606         frame->temp_textures.clear();
 607         frame->ready_fence.reset();
 608         frame->input_frames.clear();
 609 }
 610
 611 void Mixer::start()
 612 {
 613         mixer_thread = thread(&Mixer::thread_func, this);
 614 }
 615
 616 void Mixer::quit()
 617 {
 618         should_quit = true;
 619         mixer_thread.join();
 620 }
 621
 622 void Mixer::transition_clicked(int transition_num)
 623 {
 624         theme->transition_clicked(transition_num, pts());
 625 }
 626
 627 void Mixer::channel_clicked(int preview_num)
 628 {
 629         theme->channel_clicked(preview_num);
 630 }
 631
 632 Mixer::OutputChannel::~OutputChannel()
 633 {
 634         if (has_current_frame) {
 635                 parent->release_display_frame(&current_frame);
 636         }
 637         if (has_ready_frame) {
 638                 parent->release_display_frame(&ready_frame);
 639         }
 640 }
 641
 642 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
 643 {
 644         // Store this frame for display. Remove the ready frame if any
 645         // (it was seemingly never used).
 646         {
 647                 unique_lock<mutex> lock(frame_mutex);
 648                 if (has_ready_frame) {
 649                         parent->release_display_frame(&ready_frame);
 650                 }
 651                 ready_frame = frame;
 652                 has_ready_frame = true;
 653         }
 654
 655         if (has_new_frame_ready_callback) {
 656                 new_frame_ready_callback();
 657         }
 658 }
 659
 660 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
 661 {
 662         unique_lock<mutex> lock(frame_mutex);
 663         if (!has_current_frame && !has_ready_frame) {
 664                 return false;
 665         }
 666
 667         if (has_current_frame && has_ready_frame) {
 668                 // We have a new ready frame. Toss the current one.
 669                 parent->release_display_frame(&current_frame);
 670                 has_current_frame = false;
 671         }
 672         if (has_ready_frame) {
 673                 assert(!has_current_frame);
 674                 current_frame = ready_frame;
 675                 ready_frame.ready_fence.reset();  // Drop the refcount.
 676                 ready_frame.input_frames.clear();  // Drop the refcounts.
 677                 has_current_frame = true;
 678                 has_ready_frame = false;
 679         }
 680
 681         *frame = current_frame;
 682         return true;
 683 }
 684
 685 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
 686 {
 687         new_frame_ready_callback = callback;
 688         has_new_frame_ready_callback = true;
 689 }