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complete pred_dir

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Christian R. Helmrich 2021-01-30 23:00:00 +01:00
parent 7a2c4048dd
commit 7d2b818e5a
1 changed files with 20 additions and 3 deletions
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23
src/lib/stereoProcessing.cpp
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@ -1,11 +1,11 @@
/* stereoProcessing.cpp - source file for class providing M/S stereo coding functionality
* written by C. R. Helmrich, last modified in 2020 - see License.htm for legal notices
* written by C. R. Helmrich, last modified in 2021 - see License.htm for legal notices
*
* The copyright in this software is being made available under the exhale Copyright License
* and comes with ABSOLUTELY NO WARRANTY. This software may be subject to other third-
* party rights, including patent rights. No such rights are granted under this License.
*
* Copyright (c) 2018-2020 Christian R. Helmrich, project ecodis. All rights reserved.
* Copyright (c) 2018-2021 Christian R. Helmrich, project ecodis. All rights reserved.
*/
#include "exhaleLibPch.h"
@ -96,7 +96,6 @@ unsigned StereoProcessor::applyPredJointStereo (int32_t* const mdctSpectrum1, in
uint32_t* const sfbStepSize1, uint32_t* const sfbStepSize2)
{
const bool applyPredSte = (sfbStereoData != nullptr); // use real-valued predictive stereo
const bool alterPredDir = (applyPredSte && reversePredDir); // predict mid from side band?
const SfbGroupData& grp = groupingData1;
const bool eightShorts = (grp.numWindowGroups > 1);
const uint8_t maxSfbSte = (eightShorts ? __min (numSwbFrame, __max (grp.sfbsPerGroup, groupingData2.sfbsPerGroup) + 1) : numSwbFrame);
@ -104,6 +103,7 @@ unsigned StereoProcessor::applyPredJointStereo (int32_t* const mdctSpectrum1, in
#if SP_OPT_ALPHA_QUANT
const bool quantDither = ((bitRateMode >= 4) && !eightShorts); // quantization dithering?
#endif
bool alterPredDir = (applyPredSte && reversePredDir); // predict mid from side band?
uint32_t rmsSfbL[2] = {0, 0}, rmsSfbR[2] = {0, 0};
uint32_t numSfbPredSte = 0; // counter
#if SP_SFB_WISE_STEREO
@ -127,6 +127,19 @@ unsigned StereoProcessor::applyPredJointStereo (int32_t* const mdctSpectrum1, in
return 0; // zeroed ms_used, no pred.
}
#endif
#if SP_MDST_PRED
if (applyPredSte && (bitRateMode > 4) && !eightShorts && !reversePredDir) // pred_dir test
{
uint64_t sumRealM = 0, sumRealS = 0;
for (uint16_t s = grp.sfbOffsets[numSwbFrame] - 1; s > 0; s--)
{
sumRealM += abs (mdctSpectrum1[s] + mdctSpectrum2[s]); // i.e., 2*mid,
sumRealS += abs (mdctSpectrum1[s] - mdctSpectrum2[s]); // i.e., 2*side
}
alterPredDir = (sumRealS * 2 > sumRealM * 3);
}
#endif
if (applyPredSte && perCorrData) memcpy (m_stereoCorrValue, sfbStereoData, (grp.sfbOffsets[numSwbFrame] >> SA_BW_SHIFT) * sizeof (uint8_t));
#if SP_OPT_ALPHA_QUANT
@ -633,7 +646,11 @@ unsigned StereoProcessor::applyPredJointStereo (int32_t* const mdctSpectrum1, in
if (grpLength == 1) n++;
} // for gr
#if SP_MDST_PRED
numSfbPredSte = (applyPredSte && (alterPredDir != reversePredDir) ? 4 /*pred_dir=1*/ : 2);
#else
numSfbPredSte = 2;
#endif
}
return numSfbPredSte; // no error