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 <epoxy/egl.h>
  11 #include <init.h>
  12 #include <movit/effect_chain.h>
  13 #include <movit/effect_util.h>
  14 #include <movit/flat_input.h>
  15 #include <movit/image_format.h>
  16 #include <movit/resource_pool.h>
  17 #include <stdint.h>
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <sys/time.h>
  21 #include <time.h>
  22 #include <util.h>
  23 #include <algorithm>
  24 #include <cmath>
  25 #include <condition_variable>
  26 #include <cstddef>
  27 #include <memory>
  28 #include <mutex>
  29 #include <string>
  30 #include <thread>
  31 #include <utility>
  32 #include <vector>
  33
  34 #include "bmusb/bmusb.h"
  35 #include "context.h"
  36 #include "h264encode.h"
  37 #include "pbo_frame_allocator.h"
  38 #include "ref_counted_gl_sync.h"
  39 #include "timebase.h"
  40
  41 class QOpenGLContext;
  42
  43 using namespace movit;
  44 using namespace std;
  45 using namespace std::placeholders;
  46
  47 Mixer *global_mixer = nullptr;
  48
  49 namespace {
  50
  51 void convert_fixed24_to_fp32(float *dst, size_t out_channels, const uint8_t *src, size_t in_channels, size_t num_samples)
  52 {
  53         for (size_t i = 0; i < num_samples; ++i) {
  54                 for (size_t j = 0; j < out_channels; ++j) {
  55                         uint32_t s1 = *src++;
  56                         uint32_t s2 = *src++;
  57                         uint32_t s3 = *src++;
  58                         uint32_t s = s1 | (s1 << 8) | (s2 << 16) | (s3 << 24);
  59                         dst[i * out_channels + j] = int(s) * (1.0f / 4294967296.0f);
  60                 }
  61                 src += 3 * (in_channels - out_channels);
  62         }
  63 }
  64
  65 }  // namespace
  66
  67 Mixer::Mixer(const QSurfaceFormat &format, unsigned num_cards)
  68         : httpd("test.ts", WIDTH, HEIGHT),
  69           num_cards(num_cards),
  70           mixer_surface(create_surface(format)),
  71           h264_encoder_surface(create_surface(format))
  72 {
  73         httpd.start(9095);
  74
  75         CHECK(init_movit(MOVIT_SHADER_DIR, MOVIT_DEBUG_OFF));
  76         check_error();
  77
  78         // Since we allow non-bouncing 4:2:2 YCbCrInputs, effective subpixel precision
  79         // will be halved when sampling them, and we need to compensate here.
  80         movit_texel_subpixel_precision /= 2.0;
  81
  82         resource_pool.reset(new ResourcePool);
  83         theme.reset(new Theme("theme.lua", resource_pool.get(), num_cards));
  84         for (unsigned i = 0; i < NUM_OUTPUTS; ++i) {
  85                 output_channel[i].parent = this;
  86         }
  87
  88         ImageFormat inout_format;
  89         inout_format.color_space = COLORSPACE_sRGB;
  90         inout_format.gamma_curve = GAMMA_sRGB;
  91
  92         // Display chain; shows the live output produced by the main chain (its RGBA version).
  93         display_chain.reset(new EffectChain(WIDTH, HEIGHT, resource_pool.get()));
  94         check_error();
  95         display_input = new FlatInput(inout_format, FORMAT_RGB, GL_UNSIGNED_BYTE, WIDTH, HEIGHT);  // FIXME: GL_UNSIGNED_BYTE is really wrong.
  96         display_chain->add_input(display_input);
  97         display_chain->add_output(inout_format, OUTPUT_ALPHA_FORMAT_POSTMULTIPLIED);
  98         display_chain->set_dither_bits(0);  // Don't bother.
  99         display_chain->finalize();
 100
 101         h264_encoder.reset(new H264Encoder(h264_encoder_surface, WIDTH, HEIGHT, &httpd));
 102
 103         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 104                 printf("Configuring card %d...\n", card_index);
 105                 CaptureCard *card = &cards[card_index];
 106                 card->usb = new BMUSBCapture(card_index);
 107                 card->usb->set_frame_callback(bind(&Mixer::bm_frame, this, card_index, _1, _2, _3, _4, _5, _6, _7));
 108                 card->frame_allocator.reset(new PBOFrameAllocator(WIDTH * (HEIGHT+EXTRAHEIGHT) * 2 + 44, WIDTH, HEIGHT));
 109                 card->usb->set_video_frame_allocator(card->frame_allocator.get());
 110                 card->surface = create_surface(format);
 111                 card->usb->set_dequeue_thread_callbacks(
 112                         [card]{
 113                                 eglBindAPI(EGL_OPENGL_API);
 114                                 card->context = create_context(card->surface);
 115                                 if (!make_current(card->context, card->surface)) {
 116                                         printf("failed to create bmusb context\n");
 117                                         exit(1);
 118                                 }
 119                         },
 120                         [this]{
 121                                 resource_pool->clean_context();
 122                         });
 123                 card->resampler.reset(new Resampler(48000.0, 48000.0, 2));
 124                 card->usb->configure_card();
 125         }
 126
 127         BMUSBCapture::start_bm_thread();
 128
 129         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 130                 cards[card_index].usb->start_bm_capture();
 131         }
 132
 133         //chain->enable_phase_timing(true);
 134
 135         // Set up stuff for NV12 conversion.
 136
 137         // Cb/Cr shader.
 138         string cbcr_vert_shader = read_file("vs-cbcr.130.vert");
 139         string cbcr_frag_shader =
 140                 "#version 130 \n"
 141                 "in vec2 tc0; \n"
 142                 "uniform sampler2D cbcr_tex; \n"
 143                 "void main() { \n"
 144                 "    gl_FragColor = texture2D(cbcr_tex, tc0); \n"
 145                 "} \n";
 146         cbcr_program_num = resource_pool->compile_glsl_program(cbcr_vert_shader, cbcr_frag_shader);
 147
 148         r128.init(2, 48000);
 149         r128.integr_start();
 150 }
 151
 152 Mixer::~Mixer()
 153 {
 154         resource_pool->release_glsl_program(cbcr_program_num);
 155         BMUSBCapture::stop_bm_thread();
 156
 157         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 158                 {
 159                         unique_lock<mutex> lock(bmusb_mutex);
 160                         cards[card_index].should_quit = true;  // Unblock thread.
 161                         cards[card_index].new_data_ready_changed.notify_all();
 162                 }
 163                 cards[card_index].usb->stop_dequeue_thread();
 164         }
 165 }
 166
 167 namespace {
 168
 169 int unwrap_timecode(uint16_t current_wrapped, int last)
 170 {
 171         uint16_t last_wrapped = last & 0xffff;
 172         if (current_wrapped > last_wrapped) {
 173                 return (last & ~0xffff) | current_wrapped;
 174         } else {
 175                 return 0x10000 + ((last & ~0xffff) | current_wrapped);
 176         }
 177 }
 178
 179 float find_peak(const vector<float> &samples)
 180 {
 181         float m = fabs(samples[0]);
 182         for (size_t i = 1; i < samples.size(); ++i) {
 183                 m = std::max(m, fabs(samples[i]));
 184         }
 185         return m;
 186 }
 187
 188 void deinterleave_samples(const vector<float> &in, vector<float> *out_l, vector<float> *out_r)
 189 {
 190         size_t num_samples = in.size() / 2;
 191         out_l->resize(num_samples);
 192         out_r->resize(num_samples);
 193
 194         const float *inptr = in.data();
 195         float *lptr = &(*out_l)[0];
 196         float *rptr = &(*out_r)[0];
 197         for (size_t i = 0; i < num_samples; ++i) {
 198                 *lptr++ = *inptr++;
 199                 *rptr++ = *inptr++;
 200         }
 201 }
 202
 203 }  // namespace
 204
 205 void Mixer::bm_frame(unsigned card_index, uint16_t timecode,
 206                      FrameAllocator::Frame video_frame, size_t video_offset, uint16_t video_format,
 207                      FrameAllocator::Frame audio_frame, size_t audio_offset, uint16_t audio_format)
 208 {
 209         CaptureCard *card = &cards[card_index];
 210
 211         if (audio_frame.len - audio_offset > 30000) {
 212                 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",
 213                         card_index, int(audio_frame.len), int(audio_offset),
 214                         timecode, int(video_frame.len), int(video_offset), video_format);
 215                 if (video_frame.owner) {
 216                         video_frame.owner->release_frame(video_frame);
 217                 }
 218                 if (audio_frame.owner) {
 219                         audio_frame.owner->release_frame(audio_frame);
 220                 }
 221                 return;
 222         }
 223
 224         int unwrapped_timecode = timecode;
 225         int dropped_frames = 0;
 226         if (card->last_timecode != -1) {
 227                 unwrapped_timecode = unwrap_timecode(unwrapped_timecode, card->last_timecode);
 228                 dropped_frames = unwrapped_timecode - card->last_timecode - 1;
 229         }
 230         card->last_timecode = unwrapped_timecode;
 231
 232         // Convert the audio to stereo fp32 and add it.
 233         size_t num_samples = (audio_frame.len >= audio_offset) ? (audio_frame.len - audio_offset) / 8 / 3 : 0;
 234         vector<float> audio;
 235         audio.resize(num_samples * 2);
 236         convert_fixed24_to_fp32(&audio[0], 2, audio_frame.data + audio_offset, 8, num_samples);
 237
 238         // Add the audio.
 239         {
 240                 unique_lock<mutex> lock(card->audio_mutex);
 241
 242                 int unwrapped_timecode = timecode;
 243                 if (dropped_frames > 60 * 2) {
 244                         fprintf(stderr, "Card %d lost more than two seconds (or time code jumping around), resetting resampler\n",
 245                                 card_index);
 246                         card->resampler.reset(new Resampler(48000.0, 48000.0, 2));
 247                 } else if (dropped_frames > 0) {
 248                         // Insert silence as needed.
 249                         fprintf(stderr, "Card %d dropped %d frame(s) (before timecode 0x%04x), inserting silence.\n",
 250                                 card_index, dropped_frames, timecode);
 251                         vector<float> silence;
 252                         silence.resize((48000 / 60) * 2);
 253                         for (int i = 0; i < dropped_frames; ++i) {
 254                                 card->resampler->add_input_samples((unwrapped_timecode - dropped_frames + i) / 60.0, silence.data(), (48000 / 60));
 255                         }
 256                 }
 257                 card->resampler->add_input_samples(unwrapped_timecode / 60.0, audio.data(), num_samples);
 258         }
 259
 260         // Done with the audio, so release it.
 261         if (audio_frame.owner) {
 262                 audio_frame.owner->release_frame(audio_frame);
 263         }
 264
 265         {
 266                 // Wait until the previous frame was consumed.
 267                 unique_lock<mutex> lock(bmusb_mutex);
 268                 card->new_data_ready_changed.wait(lock, [card]{ return !card->new_data_ready || card->should_quit; });
 269                 if (card->should_quit) return;
 270         }
 271
 272         if (video_frame.len - video_offset != WIDTH * (HEIGHT+EXTRAHEIGHT) * 2) {
 273                 if (video_frame.len != 0) {
 274                         printf("Card %d: Dropping video frame with wrong length (%ld)\n",
 275                                 card_index, video_frame.len - video_offset);
 276                 }
 277                 if (video_frame.owner) {
 278                         video_frame.owner->release_frame(video_frame);
 279                 }
 280
 281                 // Still send on the information that we _had_ a frame, even though it's corrupted,
 282                 // so that pts can go up accordingly.
 283                 {
 284                         unique_lock<mutex> lock(bmusb_mutex);
 285                         card->new_data_ready = true;
 286                         card->new_frame = RefCountedFrame(FrameAllocator::Frame());
 287                         card->new_data_ready_fence = nullptr;
 288                         card->dropped_frames = dropped_frames;
 289                         card->new_data_ready_changed.notify_all();
 290                 }
 291                 return;
 292         }
 293
 294         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)video_frame.userdata;
 295         GLuint pbo = userdata->pbo;
 296         check_error();
 297         glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
 298         check_error();
 299         glFlushMappedBufferRange(GL_PIXEL_UNPACK_BUFFER, 0, video_frame.size);
 300         check_error();
 301         //glMemoryBarrier(GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
 302         //check_error();
 303
 304         // Upload the textures.
 305         glBindTexture(GL_TEXTURE_2D, userdata->tex_y);
 306         check_error();
 307         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));
 308         check_error();
 309         glBindTexture(GL_TEXTURE_2D, userdata->tex_cbcr);
 310         check_error();
 311         glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, WIDTH/2, HEIGHT, GL_RG, GL_UNSIGNED_BYTE, BUFFER_OFFSET(WIDTH * 25 + 22));
 312         check_error();
 313         glBindTexture(GL_TEXTURE_2D, 0);
 314         check_error();
 315         GLsync fence = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 316         check_error();
 317         assert(fence != nullptr);
 318
 319         {
 320                 unique_lock<mutex> lock(bmusb_mutex);
 321                 card->new_data_ready = true;
 322                 card->new_frame = RefCountedFrame(video_frame);
 323                 card->new_data_ready_fence = fence;
 324                 card->dropped_frames = dropped_frames;
 325                 card->new_data_ready_changed.notify_all();
 326         }
 327 }
 328
 329 void Mixer::thread_func()
 330 {
 331         eglBindAPI(EGL_OPENGL_API);
 332         QOpenGLContext *context = create_context(mixer_surface);
 333         if (!make_current(context, mixer_surface)) {
 334                 printf("oops\n");
 335                 exit(1);
 336         }
 337
 338         struct timespec start, now;
 339         clock_gettime(CLOCK_MONOTONIC, &start);
 340
 341         int frame = 0;
 342         int dropped_frames = 0;
 343
 344         while (!should_quit) {
 345                 CaptureCard card_copy[MAX_CARDS];
 346
 347                 {
 348                         unique_lock<mutex> lock(bmusb_mutex);
 349
 350                         // The first card is the master timer, so wait for it to have a new frame.
 351                         // TODO: Make configurable, and with a timeout.
 352                         cards[0].new_data_ready_changed.wait(lock, [this]{ return cards[0].new_data_ready; });
 353
 354                         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 355                                 CaptureCard *card = &cards[card_index];
 356                                 card_copy[card_index].usb = card->usb;
 357                                 card_copy[card_index].new_data_ready = card->new_data_ready;
 358                                 card_copy[card_index].new_frame = card->new_frame;
 359                                 card_copy[card_index].new_data_ready_fence = card->new_data_ready_fence;
 360                                 card_copy[card_index].dropped_frames = card->dropped_frames;
 361                                 card->new_data_ready = false;
 362                                 card->new_data_ready_changed.notify_all();
 363                         }
 364                 }
 365
 366                 // Resample the audio as needed, including from previously dropped frames.
 367                 for (unsigned frame_num = 0; frame_num < card_copy[0].dropped_frames + 1; ++frame_num) {
 368                         process_audio_one_frame();
 369                         if (frame_num != card_copy[0].dropped_frames) {
 370                                 // For dropped frames, increase the pts.
 371                                 ++dropped_frames;
 372                                 pts_int += TIMEBASE / 60;
 373                         }
 374                 }
 375
 376                 if (audio_level_callback != nullptr) {
 377                         double loudness_s = r128.loudness_S();
 378                         double loudness_i = r128.integrated();
 379                         double loudness_range_low = r128.range_min();
 380                         double loudness_range_high = r128.range_max();
 381
 382                         audio_level_callback(loudness_s, 20.0 * log10(peak),
 383                                              loudness_i, loudness_range_low, loudness_range_high);
 384                 }
 385
 386                 for (unsigned card_index = 1; card_index < num_cards; ++card_index) {
 387                         if (card_copy[card_index].new_data_ready && card_copy[card_index].new_frame->len == 0) {
 388                                 ++card_copy[card_index].dropped_frames;
 389                         }
 390                         if (card_copy[card_index].dropped_frames > 0) {
 391                                 printf("Card %u dropped %d frames before this\n",
 392                                         card_index, int(card_copy[card_index].dropped_frames));
 393                         }
 394                 }
 395
 396                 // If the first card is reporting a corrupted or otherwise dropped frame,
 397                 // just increase the pts (skipping over this frame) and don't try to compute anything new.
 398                 if (card_copy[0].new_frame->len == 0) {
 399                         ++dropped_frames;
 400                         pts_int += TIMEBASE / 60;
 401                         continue;
 402                 }
 403
 404                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 405                         CaptureCard *card = &card_copy[card_index];
 406                         if (!card->new_data_ready || card->new_frame->len == 0)
 407                                 continue;
 408
 409                         assert(card->new_frame != nullptr);
 410                         bmusb_current_rendering_frame[card_index] = card->new_frame;
 411                         check_error();
 412
 413                         // The new texture might still be uploaded,
 414                         // tell the GPU to wait until it's there.
 415                         if (card->new_data_ready_fence) {
 416                                 glWaitSync(card->new_data_ready_fence, /*flags=*/0, GL_TIMEOUT_IGNORED);
 417                                 check_error();
 418                                 glDeleteSync(card->new_data_ready_fence);
 419                                 check_error();
 420                         }
 421                         const PBOFrameAllocator::Userdata *userdata = (const PBOFrameAllocator::Userdata *)card->new_frame->userdata;
 422                         theme->set_input_textures(card_index, userdata->tex_y, userdata->tex_cbcr);
 423                 }
 424
 425                 // Get the main chain from the theme, and set its state immediately.
 426                 pair<EffectChain *, function<void()>> theme_main_chain = theme->get_chain(0, pts(), WIDTH, HEIGHT);
 427                 EffectChain *chain = theme_main_chain.first;
 428                 theme_main_chain.second();
 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                 check_error();
 439                 chain->render_to_fbo(fbo, WIDTH, HEIGHT);
 440                 resource_pool->release_fbo(fbo);
 441
 442                 subsample_chroma(cbcr_full_tex, cbcr_tex);
 443                 resource_pool->release_2d_texture(cbcr_full_tex);
 444
 445                 // Set the right state for rgba_tex.
 446                 glBindFramebuffer(GL_FRAMEBUFFER, 0);
 447                 glBindTexture(GL_TEXTURE_2D, rgba_tex);
 448                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 449                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 450                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 451
 452                 RefCountedGLsync fence(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 453                 check_error();
 454
 455                 // Make sure the H.264 gets a reference to all the
 456                 // input frames needed, so that they are not released back
 457                 // until the rendering is done.
 458                 vector<RefCountedFrame> input_frames;
 459                 for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 460                         input_frames.push_back(bmusb_current_rendering_frame[card_index]);
 461                 }
 462                 const int64_t av_delay = TIMEBASE / 10;  // Corresponds to the fixed delay in resampler.h. TODO: Make less hard-coded.
 463                 h264_encoder->end_frame(fence, pts_int + av_delay, input_frames);
 464                 ++frame;
 465                 pts_int += TIMEBASE / 60;
 466
 467                 // The live frame just shows the RGBA texture we just rendered.
 468                 // It owns rgba_tex now.
 469                 DisplayFrame live_frame;
 470                 live_frame.chain = display_chain.get();
 471                 live_frame.setup_chain = [this, rgba_tex]{
 472                         display_input->set_texture_num(rgba_tex);
 473                 };
 474                 live_frame.ready_fence = fence;
 475                 live_frame.input_frames = {};
 476                 live_frame.temp_textures = { rgba_tex };
 477                 output_channel[OUTPUT_LIVE].output_frame(live_frame);
 478
 479                 // Set up preview and any additional channels.
 480                 for (int i = 1; i < theme->get_num_channels() + 2; ++i) {
 481                         DisplayFrame display_frame;
 482                         pair<EffectChain *, function<void()>> chain = theme->get_chain(i, pts(), WIDTH, HEIGHT);  // FIXME: dimensions
 483                         display_frame.chain = chain.first;
 484                         display_frame.setup_chain = chain.second;
 485                         display_frame.ready_fence = fence;
 486
 487                         // FIXME: possible to do better?
 488                         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 489                                 display_frame.input_frames.push_back(bmusb_current_rendering_frame[card_index]);
 490                         }
 491                         display_frame.temp_textures = {};
 492                         output_channel[i].output_frame(display_frame);
 493                 }
 494
 495                 clock_gettime(CLOCK_MONOTONIC, &now);
 496                 double elapsed = now.tv_sec - start.tv_sec +
 497                         1e-9 * (now.tv_nsec - start.tv_nsec);
 498                 if (frame % 100 == 0) {
 499                         printf("%d frames (%d dropped) in %.3f seconds = %.1f fps (%.1f ms/frame)\n",
 500                                 frame, dropped_frames, elapsed, frame / elapsed,
 501                                 1e3 * elapsed / frame);
 502                 //      chain->print_phase_timing();
 503                 }
 504
 505 #if 0
 506                 // Reset every 100 frames, so that local variations in frame times
 507                 // (especially for the first few frames, when the shaders are
 508                 // compiled etc.) don't make it hard to measure for the entire
 509                 // remaining duration of the program.
 510                 if (frame == 10000) {
 511                         frame = 0;
 512                         start = now;
 513                 }
 514 #endif
 515                 check_error();
 516         }
 517
 518         resource_pool->clean_context();
 519 }
 520
 521 void Mixer::process_audio_one_frame()
 522 {
 523         vector<float> samples_card;
 524         vector<float> samples_out;
 525         for (unsigned card_index = 0; card_index < num_cards; ++card_index) {
 526                 samples_card.resize((48000 / 60) * 2);
 527                 {
 528                         unique_lock<mutex> lock(cards[card_index].audio_mutex);
 529                         if (!cards[card_index].resampler->get_output_samples(pts(), &samples_card[0], 48000 / 60)) {
 530                                 printf("Card %d reported previous underrun.\n", card_index);
 531                         }
 532                 }
 533                 // TODO: Allow using audio from the other card(s) as well.
 534                 if (card_index == 0) {
 535                         samples_out = move(samples_card);
 536                 }
 537         }
 538
 539         // Find peak and R128 levels.
 540         peak = std::max(peak, find_peak(samples_out));
 541         vector<float> left, right;
 542         deinterleave_samples(samples_out, &left, &right);
 543         float *ptrs[] = { left.data(), right.data() };
 544         r128.process(left.size(), ptrs);
 545
 546         // Actually add the samples to the output.
 547         h264_encoder->add_audio(pts_int, move(samples_out));
 548 }
 549
 550 void Mixer::subsample_chroma(GLuint src_tex, GLuint dst_tex)
 551 {
 552         GLuint vao;
 553         glGenVertexArrays(1, &vao);
 554         check_error();
 555
 556         float vertices[] = {
 557                 0.0f, 2.0f,
 558                 0.0f, 0.0f,
 559                 2.0f, 0.0f
 560         };
 561
 562         glBindVertexArray(vao);
 563         check_error();
 564
 565         // Extract Cb/Cr.
 566         GLuint fbo = resource_pool->create_fbo(dst_tex);
 567         glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 568         glViewport(0, 0, WIDTH/2, HEIGHT/2);
 569         check_error();
 570
 571         glUseProgram(cbcr_program_num);
 572         check_error();
 573
 574         glActiveTexture(GL_TEXTURE0);
 575         check_error();
 576         glBindTexture(GL_TEXTURE_2D, src_tex);
 577         check_error();
 578         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 579         check_error();
 580         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 581         check_error();
 582         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 583         check_error();
 584
 585         float chroma_offset_0[] = { -0.5f / WIDTH, 0.0f };
 586         set_uniform_vec2(cbcr_program_num, "foo", "chroma_offset_0", chroma_offset_0);
 587
 588         GLuint position_vbo = fill_vertex_attribute(cbcr_program_num, "position", 2, GL_FLOAT, sizeof(vertices), vertices);
 589         GLuint texcoord_vbo = fill_vertex_attribute(cbcr_program_num, "texcoord", 2, GL_FLOAT, sizeof(vertices), vertices);  // Same as vertices.
 590
 591         glDrawArrays(GL_TRIANGLES, 0, 3);
 592         check_error();
 593
 594         cleanup_vertex_attribute(cbcr_program_num, "position", position_vbo);
 595         cleanup_vertex_attribute(cbcr_program_num, "texcoord", texcoord_vbo);
 596
 597         glUseProgram(0);
 598         check_error();
 599
 600         resource_pool->release_fbo(fbo);
 601         glDeleteVertexArrays(1, &vao);
 602 }
 603
 604 void Mixer::release_display_frame(DisplayFrame *frame)
 605 {
 606         for (GLuint texnum : frame->temp_textures) {
 607                 resource_pool->release_2d_texture(texnum);
 608         }
 609         frame->temp_textures.clear();
 610         frame->ready_fence.reset();
 611         frame->input_frames.clear();
 612 }
 613
 614 void Mixer::start()
 615 {
 616         mixer_thread = thread(&Mixer::thread_func, this);
 617 }
 618
 619 void Mixer::quit()
 620 {
 621         should_quit = true;
 622         mixer_thread.join();
 623 }
 624
 625 void Mixer::transition_clicked(int transition_num)
 626 {
 627         theme->transition_clicked(transition_num, pts());
 628 }
 629
 630 void Mixer::channel_clicked(int preview_num)
 631 {
 632         theme->channel_clicked(preview_num);
 633 }
 634
 635 Mixer::OutputChannel::~OutputChannel()
 636 {
 637         if (has_current_frame) {
 638                 parent->release_display_frame(&current_frame);
 639         }
 640         if (has_ready_frame) {
 641                 parent->release_display_frame(&ready_frame);
 642         }
 643 }
 644
 645 void Mixer::OutputChannel::output_frame(DisplayFrame frame)
 646 {
 647         // Store this frame for display. Remove the ready frame if any
 648         // (it was seemingly never used).
 649         {
 650                 unique_lock<mutex> lock(frame_mutex);
 651                 if (has_ready_frame) {
 652                         parent->release_display_frame(&ready_frame);
 653                 }
 654                 ready_frame = frame;
 655                 has_ready_frame = true;
 656         }
 657
 658         if (has_new_frame_ready_callback) {
 659                 new_frame_ready_callback();
 660         }
 661 }
 662
 663 bool Mixer::OutputChannel::get_display_frame(DisplayFrame *frame)
 664 {
 665         unique_lock<mutex> lock(frame_mutex);
 666         if (!has_current_frame && !has_ready_frame) {
 667                 return false;
 668         }
 669
 670         if (has_current_frame && has_ready_frame) {
 671                 // We have a new ready frame. Toss the current one.
 672                 parent->release_display_frame(&current_frame);
 673                 has_current_frame = false;
 674         }
 675         if (has_ready_frame) {
 676                 assert(!has_current_frame);
 677                 current_frame = ready_frame;
 678                 ready_frame.ready_fence.reset();  // Drop the refcount.
 679                 ready_frame.input_frames.clear();  // Drop the refcounts.
 680                 has_current_frame = true;
 681                 has_ready_frame = false;
 682         }
 683
 684         *frame = current_frame;
 685         return true;
 686 }
 687
 688 void Mixer::OutputChannel::set_frame_ready_callback(Mixer::new_frame_ready_callback_t callback)
 689 {
 690         new_frame_ready_callback = callback;
 691         has_new_frame_ready_callback = true;
 692 }