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wuggy 2026-06-29 20:01:32 +01:00
commit 592e211deb
1 changed files with 11 additions and 13 deletions
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24
media/libsoundtouch/src/TDStretch.cpp
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@ -292,10 +292,10 @@ inline void TDStretch::overlap(SAMPLETYPE *pOutput, const SAMPLETYPE *pInput, ui
// The best position is determined as the position where the two overlapped
// sample sequences are 'most alike', in terms of the highest cross-correlation
// value over the overlapping period
int TDStretch::seekBestOverlapPositionFull(const SAMPLETYPE *refPos)
int TDStretch::seekBestOverlapPositionFull(const SAMPLETYPE *refPos)
{
int bestOffs;
double bestCorr;
int bestOffs;
int i;
double norm;
@ -306,28 +306,28 @@ int TDStretch::seekBestOverlapPositionFull(const SAMPLETYPE *refPos)
// over the permitted range.
bestCorr = calcCrossCorr(refPos, pMidBuffer, norm);
bestCorr = (bestCorr + 0.1) * 0.75;
const int seekLen = seekLength;
const int nChannels = channels;
const SAMPLETYPE *midBuffer = pMidBuffer;
#if defined(_OPENMP)
#pragma omp parallel for default(none) shared(refPos, bestCorr, bestOffs, midBuffer) private(i) schedule(static)
#pragma omp parallel for default(none) \
shared(refPos, bestCorr, bestOffs, midBuffer, seekLen, nChannels) \
private(i) schedule(static)
#endif
for (i = 1; i < seekLen; i ++)
for (i = 1; i < seekLen; i ++)
{
double corr;
double localNorm;
// Calculates correlation value for the mixing position corresponding to 'i'
#if defined(_OPENMP) || defined(ST_SIMD_AVOID_UNALIGNED)
// in parallel OpenMP mode, can't use norm accumulator version as parallel executor won't
// iterate the loop in sequential order
// in SIMD mode, avoid accumulator version to allow avoiding unaligned positions
corr = calcCrossCorr(refPos + nChannels * i, midBuffer, localNorm);
#else
// In non-parallel version call "calcCrossCorrAccumulate" that is otherwise same
// as "calcCrossCorr", but saves time by reusing & updating previously stored
// "norm" value
corr = calcCrossCorrAccumulate(refPos + nChannels * i, midBuffer, norm);
#endif
// heuristic rule to slightly favour values close to mid of the range
double tmp = (double)(2 * i - seekLen) / (double)seekLen;
corr = ((corr + 0.1) * (1.0 - 0.25 * tmp * tmp));
@ -336,8 +336,6 @@ for (i = 1; i < seekLen; i ++)
if (corr > bestCorr)
{
// For optimal performance, enter critical section only in case that best value found.
// in such case repeat 'if' condition as it's possible that parallel execution may have
// updated the bestCorr value in the mean time
#if defined(_OPENMP)
#pragma omp critical(soundtouch_bestcorr)
#endif
@ -353,7 +351,7 @@ for (i = 1; i < seekLen; i ++)
adaptNormalizer();
#endif
// clear cross correlation routine state if necessary (is so e.g. in MMX routines).
// clear cross correlation routine state if necessary
clearCrossCorrState();
return bestOffs;