| 335 | |
| 336 | |
| 337 | TimeHolder DeterministicTimer::enterFrameBoundary() |
| 338 | { |
| 339 | if (Global::shared_config.debug_state & SharedConfig::DEBUG_UNCONTROLLED_TIME) |
| 340 | return NonDeterministicTimer::get().enterFrameBoundary(); |
| 341 | |
| 342 | frame_mutex.lock(); |
| 343 | LOGTRACE(LCF_TIMEGET); |
| 344 | |
| 345 | insideFrameBoundary = true; |
| 346 | fakeAdvanceTimer({0, 0}); |
| 347 | |
| 348 | /*** First we update the state of the internal timer ***/ |
| 349 | |
| 350 | /* We compute by how much we should advance the timer |
| 351 | * to run exactly as the indicated framerate |
| 352 | */ |
| 353 | TimeHolder timeIncrement = baseTimeIncrement; |
| 354 | |
| 355 | fractional_part += fractional_increment; |
| 356 | while (fractional_part >= framerate_num) |
| 357 | { |
| 358 | timeIncrement.tv_nsec++; |
| 359 | fractional_part -= framerate_num; |
| 360 | } |
| 361 | |
| 362 | /* If we have less delay than the length of a frame, we advance ticks by |
| 363 | * the remaining length. Otherwise, we don't increment ticks, and we |
| 364 | * decrement addedDelay by the time increment. |
| 365 | */ |
| 366 | if (timeIncrement > addedDelay) { |
| 367 | TimeHolder deltaTicks = timeIncrement - addedDelay; |
| 368 | ticks += deltaTicks; |
| 369 | LOG(LL_DEBUG, LCF_TIMESET, "%s added %u.%09u", __func__, deltaTicks.tv_sec, deltaTicks.tv_nsec); |
| 370 | addedDelay = {0, 0}; |
| 371 | } |
| 372 | else { |
| 373 | addedDelay -= timeIncrement; |
| 374 | } |
| 375 | |
| 376 | return timeIncrement; |
| 377 | } |
| 378 | |
| 379 | void DeterministicTimer::fakeAdvanceTimer(struct timespec extraTicks) { |
| 380 | fakeExtraTicks = extraTicks; |