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

   1 #include <movit/effect_util.h>
   2 #include <movit/util.h>
   3 #include <movit/resource_pool.h>  // Must be above the Xlib includes.
   4 #include <pthread.h>
   5 #include <unistd.h>
   6
   7 #include <mutex>
   8
   9 #include <epoxy/egl.h>
  10
  11 #include "chroma_subsampler.h"
  12 #include "decklink_output.h"
  13 #include "decklink_util.h"
  14 #include "flags.h"
  15 #include "metrics.h"
  16 #include "print_latency.h"
  17 #include "timebase.h"
  18 #include "v210_converter.h"
  19
  20 using namespace movit;
  21 using namespace std;
  22 using namespace std::chrono;
  23
  24 namespace {
  25
  26 // This class can be deleted during regular use, so make all the metrics static.
  27 once_flag decklink_metrics_inited;
  28 LatencyHistogram latency_histogram;
  29 atomic<int64_t> metric_decklink_output_width_pixels{-1};
  30 atomic<int64_t> metric_decklink_output_height_pixels{-1};
  31 atomic<int64_t> metric_decklink_output_frame_rate_den{-1};
  32 atomic<int64_t> metric_decklink_output_frame_rate_nom{-1};
  33 atomic<int64_t> metric_decklink_output_inflight_frames{0};
  34 atomic<int64_t> metric_decklink_output_color_mismatch_frames{0};
  35
  36 atomic<int64_t> metric_decklink_output_scheduled_frames_dropped{0};
  37 atomic<int64_t> metric_decklink_output_scheduled_frames_late{0};
  38 atomic<int64_t> metric_decklink_output_scheduled_frames_normal{0};
  39 atomic<int64_t> metric_decklink_output_scheduled_frames_preroll{0};
  40
  41 atomic<int64_t> metric_decklink_output_completed_frames_completed{0};
  42 atomic<int64_t> metric_decklink_output_completed_frames_dropped{0};
  43 atomic<int64_t> metric_decklink_output_completed_frames_flushed{0};
  44 atomic<int64_t> metric_decklink_output_completed_frames_late{0};
  45 atomic<int64_t> metric_decklink_output_completed_frames_unknown{0};
  46
  47 atomic<int64_t> metric_decklink_output_scheduled_samples{0};
  48
  49 Summary metric_decklink_output_margin_seconds;
  50
  51 }  // namespace
  52
  53 DeckLinkOutput::DeckLinkOutput(ResourcePool *resource_pool, QSurface *surface, unsigned width, unsigned height, unsigned card_index)
  54         : resource_pool(resource_pool), surface(surface), width(width), height(height), card_index(card_index)
  55 {
  56         chroma_subsampler.reset(new ChromaSubsampler(resource_pool));
  57
  58         call_once(decklink_metrics_inited, [](){
  59                 latency_histogram.init("decklink_output");
  60                 global_metrics.add("decklink_output_width_pixels", &metric_decklink_output_width_pixels, Metrics::TYPE_GAUGE);
  61                 global_metrics.add("decklink_output_height_pixels", &metric_decklink_output_height_pixels, Metrics::TYPE_GAUGE);
  62                 global_metrics.add("decklink_output_frame_rate_den", &metric_decklink_output_frame_rate_den, Metrics::TYPE_GAUGE);
  63                 global_metrics.add("decklink_output_frame_rate_nom", &metric_decklink_output_frame_rate_nom, Metrics::TYPE_GAUGE);
  64                 global_metrics.add("decklink_output_inflight_frames", &metric_decklink_output_inflight_frames, Metrics::TYPE_GAUGE);
  65                 global_metrics.add("decklink_output_color_mismatch_frames", &metric_decklink_output_color_mismatch_frames);
  66
  67                 global_metrics.add("decklink_output_scheduled_frames", {{ "status", "dropped" }}, &metric_decklink_output_scheduled_frames_dropped);
  68                 global_metrics.add("decklink_output_scheduled_frames", {{ "status", "late" }}, &metric_decklink_output_scheduled_frames_late);
  69                 global_metrics.add("decklink_output_scheduled_frames", {{ "status", "normal" }}, &metric_decklink_output_scheduled_frames_normal);
  70                 global_metrics.add("decklink_output_scheduled_frames", {{ "status", "preroll" }}, &metric_decklink_output_scheduled_frames_preroll);
  71
  72                 global_metrics.add("decklink_output_completed_frames", {{ "status", "completed" }}, &metric_decklink_output_completed_frames_completed);
  73                 global_metrics.add("decklink_output_completed_frames", {{ "status", "dropped" }}, &metric_decklink_output_completed_frames_dropped);
  74                 global_metrics.add("decklink_output_completed_frames", {{ "status", "flushed" }}, &metric_decklink_output_completed_frames_flushed);
  75                 global_metrics.add("decklink_output_completed_frames", {{ "status", "late" }}, &metric_decklink_output_completed_frames_late);
  76                 global_metrics.add("decklink_output_completed_frames", {{ "status", "unknown" }}, &metric_decklink_output_completed_frames_unknown);
  77
  78                 global_metrics.add("decklink_output_scheduled_samples", &metric_decklink_output_scheduled_samples);
  79                 vector<double> quantiles{0.01, 0.1, 0.25, 0.5, 0.75, 0.9, 0.99};
  80                 metric_decklink_output_margin_seconds.init(quantiles, 60.0);
  81                 global_metrics.add("decklink_output_margin_seconds", &metric_decklink_output_margin_seconds);
  82         });
  83 }
  84
  85 bool DeckLinkOutput::set_device(IDeckLink *decklink)
  86 {
  87         if (decklink->QueryInterface(IID_IDeckLinkOutput, (void**)&output) != S_OK) {
  88                 fprintf(stderr, "Warning: Card %u has no outputs\n", card_index);
  89                 return false;
  90         }
  91
  92         IDeckLinkDisplayModeIterator *mode_it;
  93         if (output->GetDisplayModeIterator(&mode_it) != S_OK) {
  94                 fprintf(stderr, "Warning: Failed to enumerate output display modes for card %u\n", card_index);
  95                 return false;
  96         }
  97
  98         video_modes.clear();
  99
 100         for (const auto &it : summarize_video_modes(mode_it, card_index)) {
 101                 if (it.second.width != width || it.second.height != height) {
 102                         continue;
 103                 }
 104
 105                 // We could support interlaced modes, but let's stay out of it for now,
 106                 // since we don't have interlaced stream output.
 107                 if (it.second.interlaced) {
 108                         continue;
 109                 }
 110
 111                 video_modes.insert(it);
 112         }
 113
 114         mode_it->Release();
 115
 116         // HDMI or SDI generally mean “both HDMI and SDI at the same time” on DeckLink cards
 117         // that support both; pick_default_video_connection() will generally pick one of those
 118         // if they exist. (--prefer-hdmi-input would also affect the selection despite the name
 119         // of the option, but since either generally means both, it's inconsequential.)
 120         // We're not very likely to need analog outputs, so we don't need a way to change
 121         // beyond that.
 122         video_connection = pick_default_video_connection(decklink, BMDDeckLinkVideoOutputConnections, card_index);
 123         return true;
 124 }
 125
 126 void DeckLinkOutput::start_output(uint32_t mode, int64_t base_pts)
 127 {
 128         assert(output);
 129         assert(!playback_initiated);
 130
 131         if (video_modes.empty()) {
 132                 fprintf(stderr, "ERROR: No matching output modes for %dx%d found\n", width, height);
 133                 exit(1);
 134         }
 135
 136         should_quit.unquit();
 137         playback_initiated = true;
 138         playback_started = false;
 139         this->base_pts = base_pts;
 140
 141         IDeckLinkConfiguration *config = nullptr;
 142         if (output->QueryInterface(IID_IDeckLinkConfiguration, (void**)&config) != S_OK) {
 143                 fprintf(stderr, "Failed to get configuration interface for output card\n");
 144                 exit(1);
 145         }
 146         if (config->SetFlag(bmdDeckLinkConfigLowLatencyVideoOutput, true) != S_OK) {
 147                 fprintf(stderr, "Failed to set low latency output\n");
 148                 exit(1);
 149         }
 150         if (config->SetInt(bmdDeckLinkConfigVideoOutputConnection, video_connection) != S_OK) {
 151                 fprintf(stderr, "Failed to set video output connection for card %u\n", card_index);
 152                 exit(1);
 153         }
 154         if (config->SetFlag(bmdDeckLinkConfigUse1080pNotPsF, true) != S_OK) {
 155                 fprintf(stderr, "Failed to set PsF flag for card\n");
 156                 exit(1);
 157         }
 158         if (config->SetFlag(bmdDeckLinkConfigSMPTELevelAOutput, true) != S_OK) {
 159                 // This affects at least some no-name SDI->HDMI converters.
 160                 // Warn, but don't die.
 161                 fprintf(stderr, "WARNING: Failed to enable SMTPE Level A; resolutions like 1080p60 might have issues.\n");
 162         }
 163
 164         BMDDisplayModeSupport support;
 165         IDeckLinkDisplayMode *display_mode;
 166         BMDPixelFormat pixel_format = global_flags.ten_bit_output ? bmdFormat10BitYUV : bmdFormat8BitYUV;
 167         if (output->DoesSupportVideoMode(mode, pixel_format, bmdVideoOutputFlagDefault,
 168                                          &support, &display_mode) != S_OK) {
 169                 fprintf(stderr, "Couldn't ask for format support\n");
 170                 exit(1);
 171         }
 172
 173         if (support == bmdDisplayModeNotSupported) {
 174                 fprintf(stderr, "Requested display mode not supported\n");
 175                 exit(1);
 176         }
 177
 178         current_mode_flags = display_mode->GetFlags();
 179
 180         BMDTimeValue time_value;
 181         BMDTimeScale time_scale;
 182         if (display_mode->GetFrameRate(&time_value, &time_scale) != S_OK) {
 183                 fprintf(stderr, "Couldn't get frame rate\n");
 184                 exit(1);
 185         }
 186
 187         metric_decklink_output_width_pixels = width;
 188         metric_decklink_output_height_pixels = height;
 189         metric_decklink_output_frame_rate_nom = time_value;
 190         metric_decklink_output_frame_rate_den = time_scale;
 191
 192         frame_duration = time_value * TIMEBASE / time_scale;
 193
 194         display_mode->Release();
 195
 196         HRESULT result = output->EnableVideoOutput(mode, bmdVideoOutputFlagDefault);
 197         if (result != S_OK) {
 198                 fprintf(stderr, "Couldn't enable output with error 0x%x\n", result);
 199                 exit(1);
 200         }
 201         if (output->SetScheduledFrameCompletionCallback(this) != S_OK) {
 202                 fprintf(stderr, "Couldn't set callback\n");
 203                 exit(1);
 204         }
 205         assert(OUTPUT_FREQUENCY == 48000);
 206         if (output->EnableAudioOutput(bmdAudioSampleRate48kHz, bmdAudioSampleType32bitInteger, 2, bmdAudioOutputStreamTimestamped) != S_OK) {
 207                 fprintf(stderr, "Couldn't enable audio output\n");
 208                 exit(1);
 209         }
 210         if (output->BeginAudioPreroll() != S_OK) {
 211                 fprintf(stderr, "Couldn't begin audio preroll\n");
 212                 exit(1);
 213         }
 214
 215         present_thread = thread([this]{
 216                 QOpenGLContext *context = create_context(this->surface);
 217                 eglBindAPI(EGL_OPENGL_API);
 218                 if (!make_current(context, this->surface)) {
 219                         printf("display=%p surface=%p context=%p curr=%p err=%d\n", eglGetCurrentDisplay(), this->surface, context, eglGetCurrentContext(),
 220                                 eglGetError());
 221                         exit(1);
 222                 }
 223                 present_thread_func();
 224                 delete_context(context);
 225         });
 226 }
 227
 228 void DeckLinkOutput::end_output()
 229 {
 230         if (!playback_initiated) {
 231                 return;
 232         }
 233
 234         should_quit.quit();
 235         frame_queues_changed.notify_all();
 236         present_thread.join();
 237         playback_initiated = false;
 238
 239         output->StopScheduledPlayback(0, nullptr, 0);
 240         output->DisableVideoOutput();
 241         output->DisableAudioOutput();
 242
 243         // Wait until all frames are accounted for, and free them.
 244         {
 245                 unique_lock<mutex> lock(frame_queue_mutex);
 246                 while (!(frame_freelist.empty() && num_frames_in_flight == 0)) {
 247                         frame_queues_changed.wait(lock, [this]{ return !frame_freelist.empty(); });
 248                         frame_freelist.pop();
 249                 }
 250         }
 251 }
 252
 253 void DeckLinkOutput::send_frame(GLuint y_tex, GLuint cbcr_tex, YCbCrLumaCoefficients output_ycbcr_coefficients, const vector<RefCountedFrame> &input_frames, int64_t pts, int64_t duration)
 254 {
 255         assert(!should_quit.should_quit());
 256
 257         if ((current_mode_flags & bmdDisplayModeColorspaceRec601) && output_ycbcr_coefficients == YCBCR_REC_709) {
 258                 if (!last_frame_had_mode_mismatch) {
 259                         fprintf(stderr, "WARNING: Chosen output mode expects Rec. 601 Y'CbCr coefficients.\n");
 260                         fprintf(stderr, "         Consider --output-ycbcr-coefficients=rec601 (or =auto).\n");
 261                 }
 262                 last_frame_had_mode_mismatch = true;
 263                 ++metric_decklink_output_color_mismatch_frames;
 264         } else if ((current_mode_flags & bmdDisplayModeColorspaceRec709) && output_ycbcr_coefficients == YCBCR_REC_601) {
 265                 if (!last_frame_had_mode_mismatch) {
 266                         fprintf(stderr, "WARNING: Chosen output mode expects Rec. 709 Y'CbCr coefficients.\n");
 267                         fprintf(stderr, "         Consider --output-ycbcr-coefficients=rec709 (or =auto).\n");
 268                 }
 269                 last_frame_had_mode_mismatch = true;
 270                 ++metric_decklink_output_color_mismatch_frames;
 271         } else {
 272                 last_frame_had_mode_mismatch = false;
 273         }
 274
 275         unique_ptr<Frame> frame = get_frame();
 276         if (global_flags.ten_bit_output) {
 277                 chroma_subsampler->create_v210(y_tex, cbcr_tex, width, height, frame->uyvy_tex);
 278         } else {
 279                 chroma_subsampler->create_uyvy(y_tex, cbcr_tex, width, height, frame->uyvy_tex);
 280         }
 281
 282         // Download the UYVY texture to the PBO.
 283         glPixelStorei(GL_PACK_ROW_LENGTH, 0);
 284         check_error();
 285
 286         glBindBuffer(GL_PIXEL_PACK_BUFFER, frame->pbo);
 287         check_error();
 288
 289         if (global_flags.ten_bit_output) {
 290                 glBindTexture(GL_TEXTURE_2D, frame->uyvy_tex);
 291                 check_error();
 292                 glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, BUFFER_OFFSET(0));
 293                 check_error();
 294         } else {
 295                 glBindTexture(GL_TEXTURE_2D, frame->uyvy_tex);
 296                 check_error();
 297                 glGetTexImage(GL_TEXTURE_2D, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, BUFFER_OFFSET(0));
 298                 check_error();
 299         }
 300
 301         glBindTexture(GL_TEXTURE_2D, 0);
 302         check_error();
 303         glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
 304         check_error();
 305
 306         glMemoryBarrier(GL_TEXTURE_UPDATE_BARRIER_BIT | GL_CLIENT_MAPPED_BUFFER_BARRIER_BIT);
 307         check_error();
 308
 309         frame->fence = RefCountedGLsync(GL_SYNC_GPU_COMMANDS_COMPLETE, /*flags=*/0);
 310         check_error();
 311         glFlush();  // Make the DeckLink thread see the fence as soon as possible.
 312         check_error();
 313
 314         frame->input_frames = input_frames;
 315         frame->received_ts = find_received_timestamp(input_frames);
 316         frame->pts = pts;
 317         frame->duration = duration;
 318
 319         {
 320                 unique_lock<mutex> lock(frame_queue_mutex);
 321                 pending_video_frames.push(move(frame));
 322         }
 323         frame_queues_changed.notify_all();
 324 }
 325
 326 void DeckLinkOutput::send_audio(int64_t pts, const std::vector<float> &samples)
 327 {
 328         unique_ptr<int32_t[]> int_samples(new int32_t[samples.size()]);
 329         for (size_t i = 0; i < samples.size(); ++i) {
 330                 int_samples[i] = lrintf(samples[i] * 2147483648.0f);
 331         }
 332
 333         uint32_t frames_written;
 334         HRESULT result = output->ScheduleAudioSamples(int_samples.get(), samples.size() / 2,
 335                 pts, TIMEBASE, &frames_written);
 336         if (result != S_OK) {
 337                 fprintf(stderr, "ScheduleAudioSamples(pts=%ld) failed (result=0x%08x)\n", pts, result);
 338         } else {
 339                 if (frames_written != samples.size() / 2) {
 340                         fprintf(stderr, "ScheduleAudioSamples() returned short write (%u/%ld)\n", frames_written, samples.size() / 2);
 341                 }
 342         }
 343         metric_decklink_output_scheduled_samples += samples.size() / 2;
 344 }
 345
 346 void DeckLinkOutput::wait_for_frame(int64_t pts, int *dropped_frames, int64_t *frame_duration, bool *is_preroll, steady_clock::time_point *frame_timestamp)
 347 {
 348         assert(!should_quit.should_quit());
 349
 350         *dropped_frames = 0;
 351         *frame_duration = this->frame_duration;
 352
 353         const BMDTimeValue buffer = lrint(*frame_duration * global_flags.output_buffer_frames);
 354         const BMDTimeValue max_overshoot = lrint(*frame_duration * global_flags.output_slop_frames);
 355         BMDTimeValue target_time = pts - buffer;
 356
 357         // While prerolling, we send out frames as quickly as we can.
 358         if (target_time < base_pts) {
 359                 *is_preroll = true;
 360                 ++metric_decklink_output_scheduled_frames_preroll;
 361                 return;
 362         }
 363
 364         *is_preroll = !playback_started;
 365
 366         if (!playback_started) {
 367                 if (output->EndAudioPreroll() != S_OK) {
 368                         fprintf(stderr, "Could not end audio preroll\n");
 369                         exit(1);  // TODO
 370                 }
 371                 if (output->StartScheduledPlayback(base_pts, TIMEBASE, 1.0) != S_OK) {
 372                         fprintf(stderr, "Could not start playback\n");
 373                         exit(1);  // TODO
 374                 }
 375                 playback_started = true;
 376         }
 377
 378         BMDTimeValue stream_frame_time;
 379         double playback_speed;
 380         output->GetScheduledStreamTime(TIMEBASE, &stream_frame_time, &playback_speed);
 381
 382         *frame_timestamp = steady_clock::now() +
 383                 nanoseconds((target_time - stream_frame_time) * 1000000000 / TIMEBASE);
 384
 385         metric_decklink_output_margin_seconds.count_event(
 386                 (target_time - stream_frame_time) / double(TIMEBASE));
 387
 388         // If we're ahead of time, wait for the frame to (approximately) start.
 389         if (stream_frame_time < target_time) {
 390                 should_quit.sleep_until(*frame_timestamp);
 391                 ++metric_decklink_output_scheduled_frames_normal;
 392                 return;
 393         }
 394
 395         // If we overshot the previous frame by just a little,
 396         // fire off one immediately.
 397         if (stream_frame_time < target_time + max_overshoot) {
 398                 fprintf(stderr, "Warning: Frame was %ld ms late (but not skipping it due to --output-slop-frames).\n",
 399                         lrint((stream_frame_time - target_time) * 1000.0 / TIMEBASE));
 400                 ++metric_decklink_output_scheduled_frames_late;
 401                 return;
 402         }
 403
 404         // Oops, we missed by more than one frame. Return immediately,
 405         // but drop so that we catch up.
 406         *dropped_frames = (stream_frame_time - target_time + *frame_duration - 1) / *frame_duration;
 407         const int64_t ns_per_frame = this->frame_duration * 1000000000 / TIMEBASE;
 408         *frame_timestamp += nanoseconds(*dropped_frames * ns_per_frame);
 409         fprintf(stderr, "Dropped %d output frames; skipping.\n", *dropped_frames);
 410         metric_decklink_output_scheduled_frames_dropped += *dropped_frames;
 411         ++metric_decklink_output_scheduled_frames_normal;
 412 }
 413
 414 uint32_t DeckLinkOutput::pick_video_mode(uint32_t mode) const
 415 {
 416         if (video_modes.count(mode)) {
 417                 return mode;
 418         }
 419
 420         // Prioritize 59.94 > 60 > 29.97. If none of those are found, then pick the highest one.
 421         for (const pair<int, int> &desired : vector<pair<int, int>>{ { 60000, 1001 }, { 60, 0 }, { 30000, 1001 } }) {
 422                 for (const auto &it : video_modes) {
 423                         if (it.second.frame_rate_num * desired.second == desired.first * it.second.frame_rate_den) {
 424                                 return it.first;
 425                         }
 426                 }
 427         }
 428
 429         uint32_t best_mode = 0;
 430         double best_fps = 0.0;
 431         for (const auto &it : video_modes) {
 432                 double fps = double(it.second.frame_rate_num) / it.second.frame_rate_den;
 433                 if (fps > best_fps) {
 434                         best_mode = it.first;
 435                         best_fps = fps;
 436                 }
 437         }
 438         return best_mode;
 439 }
 440
 441 YCbCrLumaCoefficients DeckLinkOutput::preferred_ycbcr_coefficients() const
 442 {
 443         if (current_mode_flags & bmdDisplayModeColorspaceRec601) {
 444                 return YCBCR_REC_601;
 445         } else {
 446                 // Don't bother checking bmdDisplayModeColorspaceRec709;
 447                 // if none is set, 709 is a good default anyway.
 448                 return YCBCR_REC_709;
 449         }
 450 }
 451
 452 HRESULT DeckLinkOutput::ScheduledFrameCompleted(/* in */ IDeckLinkVideoFrame *completedFrame, /* in */ BMDOutputFrameCompletionResult result)
 453 {
 454         Frame *frame = static_cast<Frame *>(completedFrame);
 455         switch (result) {
 456         case bmdOutputFrameCompleted:
 457                 ++metric_decklink_output_completed_frames_completed;
 458                 break;
 459         case bmdOutputFrameDisplayedLate:
 460                 fprintf(stderr, "Output frame displayed late (pts=%ld)\n", frame->pts);
 461                 fprintf(stderr, "Consider increasing --output-buffer-frames if this persists.\n");
 462                 ++metric_decklink_output_completed_frames_late;
 463                 break;
 464         case bmdOutputFrameDropped:
 465                 fprintf(stderr, "Output frame was dropped (pts=%ld)\n", frame->pts);
 466                 fprintf(stderr, "Consider increasing --output-buffer-frames if this persists.\n");
 467                 ++metric_decklink_output_completed_frames_dropped;
 468                 break;
 469         case bmdOutputFrameFlushed:
 470                 fprintf(stderr, "Output frame was flushed (pts=%ld)\n", frame->pts);
 471                 ++metric_decklink_output_completed_frames_flushed;
 472                 break;
 473         default:
 474                 fprintf(stderr, "Output frame completed with unknown status %d\n", result);
 475                 ++metric_decklink_output_completed_frames_unknown;
 476                 break;
 477         }
 478
 479         static int frameno = 0;
 480         print_latency("DeckLink output latency (frame received → output on HDMI):", frame->received_ts, false, &frameno, &latency_histogram);
 481
 482         {
 483                 lock_guard<mutex> lock(frame_queue_mutex);
 484                 frame_freelist.push(unique_ptr<Frame>(frame));
 485                 --num_frames_in_flight;
 486                 --metric_decklink_output_inflight_frames;
 487         }
 488
 489         return S_OK;
 490 }
 491
 492 HRESULT DeckLinkOutput::ScheduledPlaybackHasStopped()
 493 {
 494         printf("playback stopped!\n");
 495         return S_OK;
 496 }
 497
 498 unique_ptr<DeckLinkOutput::Frame> DeckLinkOutput::get_frame()
 499 {
 500         lock_guard<mutex> lock(frame_queue_mutex);
 501
 502         if (!frame_freelist.empty()) {
 503                 unique_ptr<Frame> frame = move(frame_freelist.front());
 504                 frame_freelist.pop();
 505                 return frame;
 506         }
 507
 508         unique_ptr<Frame> frame(new Frame);
 509
 510         size_t stride;
 511         if (global_flags.ten_bit_output) {
 512                 stride = v210Converter::get_v210_stride(width);
 513                 GLint v210_width = stride / sizeof(uint32_t);
 514                 frame->uyvy_tex = resource_pool->create_2d_texture(GL_RGB10_A2, v210_width, height);
 515
 516                 // We need valid texture state, or NVIDIA won't allow us to write to the texture.
 517                 glBindTexture(GL_TEXTURE_2D, frame->uyvy_tex);
 518                 check_error();
 519                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 520                 check_error();
 521         } else {
 522                 stride = width * 2;
 523                 frame->uyvy_tex = resource_pool->create_2d_texture(GL_RGBA8, width / 2, height);
 524         }
 525
 526         glGenBuffers(1, &frame->pbo);
 527         check_error();
 528         glBindBuffer(GL_PIXEL_PACK_BUFFER, frame->pbo);
 529         check_error();
 530         glBufferStorage(GL_PIXEL_PACK_BUFFER, stride * height, nullptr, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 531         check_error();
 532         frame->uyvy_ptr = (uint8_t *)glMapBufferRange(GL_PIXEL_PACK_BUFFER, 0, stride * height, GL_MAP_READ_BIT | GL_MAP_PERSISTENT_BIT);
 533         check_error();
 534         frame->uyvy_ptr_local.reset(new uint8_t[stride * height]);
 535         frame->resource_pool = resource_pool;
 536
 537         return frame;
 538 }
 539
 540 void DeckLinkOutput::present_thread_func()
 541 {
 542         pthread_setname_np(pthread_self(), "DeckLinkOutput");
 543         for ( ;; ) {
 544                 unique_ptr<Frame> frame;
 545                 {
 546                         unique_lock<mutex> lock(frame_queue_mutex);
 547                         frame_queues_changed.wait(lock, [this]{
 548                                 return should_quit.should_quit() || !pending_video_frames.empty();
 549                         });
 550                         if (should_quit.should_quit()) {
 551                                 return;
 552                         }
 553                         frame = move(pending_video_frames.front());
 554                         pending_video_frames.pop();
 555                         ++num_frames_in_flight;
 556                         ++metric_decklink_output_inflight_frames;
 557                 }
 558
 559                 for ( ;; ) {
 560                         int err = glClientWaitSync(frame->fence.get(), /*flags=*/0, 0);
 561                         if (err == GL_TIMEOUT_EXPIRED) {
 562                                 // NVIDIA likes to busy-wait; yield instead.
 563                                 this_thread::sleep_for(milliseconds(1));
 564                         } else {
 565                                 break;
 566                         }
 567                 }
 568                 check_error();
 569                 frame->fence.reset();
 570
 571                 if (global_flags.ten_bit_output) {
 572                         memcpy(frame->uyvy_ptr_local.get(), frame->uyvy_ptr, v210Converter::get_v210_stride(width) * height);
 573                 } else {
 574                         memcpy(frame->uyvy_ptr_local.get(), frame->uyvy_ptr, width * height * 2);
 575                 }
 576
 577                 // Release any input frames we needed to render this frame.
 578                 frame->input_frames.clear();
 579
 580                 BMDTimeValue pts = frame->pts;
 581                 BMDTimeValue duration = frame->duration;
 582                 HRESULT res = output->ScheduleVideoFrame(frame.get(), pts, duration, TIMEBASE);
 583                 if (res == S_OK) {
 584                         frame.release();  // Owned by the driver now.
 585                 } else {
 586                         fprintf(stderr, "Could not schedule video frame! (error=0x%08x)\n", res);
 587
 588                         lock_guard<mutex> lock(frame_queue_mutex);
 589                         frame_freelist.push(move(frame));
 590                         --num_frames_in_flight;
 591                         --metric_decklink_output_inflight_frames;
 592                 }
 593         }
 594 }
 595
 596 HRESULT STDMETHODCALLTYPE DeckLinkOutput::QueryInterface(REFIID, LPVOID *)
 597 {
 598         return E_NOINTERFACE;
 599 }
 600
 601 ULONG STDMETHODCALLTYPE DeckLinkOutput::AddRef()
 602 {
 603         return refcount.fetch_add(1) + 1;
 604 }
 605
 606 ULONG STDMETHODCALLTYPE DeckLinkOutput::Release()
 607 {
 608         int new_ref = refcount.fetch_sub(1) - 1;
 609         if (new_ref == 0)
 610                 delete this;
 611         return new_ref;
 612 }
 613
 614 DeckLinkOutput::Frame::~Frame()
 615 {
 616         glBindBuffer(GL_PIXEL_PACK_BUFFER, pbo);
 617         check_error();
 618         glUnmapBuffer(GL_PIXEL_PACK_BUFFER);
 619         check_error();
 620         glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
 621         check_error();
 622         glDeleteBuffers(1, &pbo);
 623         check_error();
 624         resource_pool->release_2d_texture(uyvy_tex);
 625         check_error();
 626 }
 627
 628 HRESULT STDMETHODCALLTYPE DeckLinkOutput::Frame::QueryInterface(REFIID, LPVOID *)
 629 {
 630         return E_NOINTERFACE;
 631 }
 632
 633 ULONG STDMETHODCALLTYPE DeckLinkOutput::Frame::AddRef()
 634 {
 635         return refcount.fetch_add(1) + 1;
 636 }
 637
 638 ULONG STDMETHODCALLTYPE DeckLinkOutput::Frame::Release()
 639 {
 640         int new_ref = refcount.fetch_sub(1) - 1;
 641         if (new_ref == 0)
 642                 delete this;
 643         return new_ref;
 644 }
 645
 646 long DeckLinkOutput::Frame::GetWidth()
 647 {
 648         return global_flags.width;
 649 }
 650
 651 long DeckLinkOutput::Frame::GetHeight()
 652 {
 653         return global_flags.height;
 654 }
 655
 656 long DeckLinkOutput::Frame::GetRowBytes()
 657 {
 658         if (global_flags.ten_bit_output) {
 659                 return v210Converter::get_v210_stride(global_flags.width);
 660         } else {
 661                 return global_flags.width * 2;
 662         }
 663 }
 664
 665 BMDPixelFormat DeckLinkOutput::Frame::GetPixelFormat()
 666 {
 667         if (global_flags.ten_bit_output) {
 668                 return bmdFormat10BitYUV;
 669         } else {
 670                 return bmdFormat8BitYUV;
 671         }
 672 }
 673
 674 BMDFrameFlags DeckLinkOutput::Frame::GetFlags()
 675 {
 676         return bmdFrameFlagDefault;
 677 }
 678
 679 HRESULT DeckLinkOutput::Frame::GetBytes(/* out */ void **buffer)
 680 {
 681         *buffer = uyvy_ptr_local.get();
 682         return S_OK;
 683 }
 684
 685 HRESULT DeckLinkOutput::Frame::GetTimecode(/* in */ BMDTimecodeFormat format, /* out */ IDeckLinkTimecode **timecode)
 686 {
 687         fprintf(stderr, "STUB: GetTimecode()\n");
 688         return E_NOTIMPL;
 689 }
 690
 691 HRESULT DeckLinkOutput::Frame::GetAncillaryData(/* out */ IDeckLinkVideoFrameAncillary **ancillary)
 692 {
 693         fprintf(stderr, "STUB: GetAncillaryData()\n");
 694         return E_NOTIMPL;
 695 }