void TComSPS::setHrdParameters(uint32_t frameRate, uint32_t numDU, uint32_t bitRate, bool randomAccess) { if (!getVuiParametersPresentFlag()) { return; } TComVUI *vui = getVuiParameters(); TComHRD *hrd = vui->getHrdParameters(); TimingInfo *timingInfo = vui->getTimingInfo(); timingInfo->setTimingInfoPresentFlag(true); switch (frameRate) { case 24: timingInfo->setNumUnitsInTick(1125000); timingInfo->setTimeScale(27000000); break; case 25: timingInfo->setNumUnitsInTick(1080000); timingInfo->setTimeScale(27000000); break; case 30: timingInfo->setNumUnitsInTick(900900); timingInfo->setTimeScale(27000000); break; case 50: timingInfo->setNumUnitsInTick(540000); timingInfo->setTimeScale(27000000); break; case 60: timingInfo->setNumUnitsInTick(450450); timingInfo->setTimeScale(27000000); break; default: timingInfo->setNumUnitsInTick(1001); timingInfo->setTimeScale(60000); break; } bool rateCnt = (bitRate > 0); hrd->setNalHrdParametersPresentFlag(rateCnt); hrd->setVclHrdParametersPresentFlag(rateCnt); hrd->setSubPicCpbParamsPresentFlag((numDU > 1)); if (hrd->getSubPicCpbParamsPresentFlag()) { hrd->setTickDivisorMinus2(100 - 2); hrd->setDuCpbRemovalDelayLengthMinus1(7); // 8-bit precision ( plus 1 for last DU in AU ) hrd->setSubPicCpbParamsInPicTimingSEIFlag(true); hrd->setDpbOutputDelayDuLengthMinus1(5 + 7); // With sub-clock tick factor of 100, at least 7 bits to have the same value as AU dpb delay } else { hrd->setSubPicCpbParamsInPicTimingSEIFlag(false); } hrd->setBitRateScale(4); // in units of 2~( 6 + 4 ) = 1,024 bps hrd->setCpbSizeScale(6); // in units of 2~( 4 + 4 ) = 1,024 bit hrd->setDuCpbSizeScale(6); // in units of 2~( 4 + 4 ) = 1,024 bit hrd->setInitialCpbRemovalDelayLengthMinus1(15); // assuming 0.5 sec, log2( 90,000 * 0.5 ) = 16-bit if (randomAccess) { hrd->setCpbRemovalDelayLengthMinus1(5); // 32 = 2^5 (plus 1) hrd->setDpbOutputDelayLengthMinus1(5); // 32 + 3 = 2^6 } else { hrd->setCpbRemovalDelayLengthMinus1(9); // max. 2^10 hrd->setDpbOutputDelayLengthMinus1(9); // max. 2^10 } /* Note: only the case of "vps_max_temporal_layers_minus1 = 0" is supported. */ int i, j; uint32_t birateValue, cpbSizeValue; uint32_t ducpbSizeValue; uint32_t duBitRateValue = 0; for (i = 0; i < MAX_TLAYER; i++) { hrd->setFixedPicRateFlag(i, 1); hrd->setPicDurationInTcMinus1(i, 0); hrd->setLowDelayHrdFlag(i, 0); hrd->setCpbCntMinus1(i, 0); birateValue = bitRate; cpbSizeValue = bitRate; // 1 second ducpbSizeValue = bitRate / numDU; duBitRateValue = bitRate; for (j = 0; j < (hrd->getCpbCntMinus1(i) + 1); j++) { hrd->setBitRateValueMinus1(i, j, 0, (birateValue - 1)); hrd->setCpbSizeValueMinus1(i, j, 0, (cpbSizeValue - 1)); hrd->setDuCpbSizeValueMinus1(i, j, 0, (ducpbSizeValue - 1)); hrd->setCbrFlag(i, j, 0, (j == 0)); hrd->setBitRateValueMinus1(i, j, 1, (birateValue - 1)); hrd->setCpbSizeValueMinus1(i, j, 1, (cpbSizeValue - 1)); hrd->setDuCpbSizeValueMinus1(i, j, 1, (ducpbSizeValue - 1)); hrd->setDuBitRateValueMinus1(i, j, 1, (duBitRateValue - 1)); hrd->setCbrFlag(i, j, 1, (j == 0)); } } }