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extrema tuning

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This commit is contained in:
Christian R. Helmrich
2020-05-01 15:00:35 +02:00
parent 70534ca7b4
commit a3be5338f2
4 changed files with 80 additions and 9 deletions
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70
src/lib/specAnalysis.cpp
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@ -30,6 +30,10 @@ SpecAnalyzer::SpecAnalyzer ()
for (unsigned ch = 0; ch < USAC_MAX_NUM_CHANNELS; ch++)
{
m_bandwidthOff[ch] = 0;
#if SA_IMPROVED_SFM_ESTIM
m_magnCorrPrev[ch] = 0;
m_magnSpectra [ch] = nullptr;
#endif
m_numAnaBands [ch] = 0;
m_specAnaStats[ch] = 0;
memset (m_parCorCoeffs[ch], 0, MAX_PREDICTION_ORDER * sizeof (short));
@ -171,14 +175,23 @@ void SpecAnalyzer::getSpectralBandwidth (uint16_t bandwidthOffset[USAC_MAX_NUM_C
memcpy (bandwidthOffset, m_bandwidthOff, nChannels * sizeof (uint16_t));
}
unsigned SpecAnalyzer::initLinPredictor (LinearPredictor* const linPredictor)
unsigned SpecAnalyzer::initSigAnaMemory (LinearPredictor* const linPredictor, const unsigned nChannels, const unsigned maxTransfLength)
{
if (linPredictor == nullptr)
{
return 1; // invalid arguments error
}
m_tnsPredictor = linPredictor;
#if SA_IMPROVED_SFM_ESTIM
for (unsigned ch = 0; ch < nChannels; ch++)
{
if ((m_magnSpectra[ch] = (uint32_t*) malloc (maxTransfLength * sizeof (uint32_t))) == nullptr)
{
return 2; // mem. allocation error
}
memset (m_magnSpectra[ch], 0, maxTransfLength * sizeof (uint32_t));
}
#endif
return 0; // no error
}
@ -236,6 +249,7 @@ unsigned SpecAnalyzer::spectralAnalysis (const int32_t* const mdctSignals[USAC_M
const unsigned nChannels, const unsigned nSamplesInFrame, const unsigned samplingRate,
const unsigned lfeChannelIndex /*= USAC_MAX_NUM_CHANNELS*/) // to skip an LFE channel
{
const uint64_t anaBwOffset = SA_BW >> 1;
const unsigned lpcStopBand16k = (samplingRate <= 32000 ? nSamplesInFrame : (32000 * nSamplesInFrame) / samplingRate) >> SA_BW_SHIFT;
const unsigned thresholdSlope = (48000 + SA_EPS * samplingRate) / 96000;
const unsigned thresholdStart = samplingRate >> 15;
@ -250,6 +264,11 @@ unsigned SpecAnalyzer::spectralAnalysis (const int32_t* const mdctSignals[USAC_M
{
const int32_t* const chMdct = mdctSignals[ch];
const int32_t* const chMdst = mdstSignals[ch];
#if SA_IMPROVED_SFM_ESTIM
uint32_t* const chPrvMagn = m_magnSpectra[ch];
const bool improvedSfmEstim = (chPrvMagn != nullptr);
uint16_t currMC = 0, numMC = 0; // channel average
#endif
// --- get L1 norm and max value in each band
uint16_t idxMaxSpec = 0;
uint64_t sumAvgBand = 0;
@ -273,10 +292,17 @@ unsigned SpecAnalyzer::spectralAnalysis (const int32_t* const mdctSignals[USAC_M
const uint16_t offs = b << SA_BW_SHIFT; // start offset of current analysis band
const int32_t* const bMdct = &chMdct[offs];
const int32_t* const bMdst = &chMdst[offs];
#if SA_IMPROVED_SFM_ESTIM
uint32_t* const prvMagn = (improvedSfmEstim ? &chPrvMagn[offs] : nullptr);
#endif
uint16_t maxAbsIdx = 0;
uint32_t maxAbsVal = 0, tmp = UINT_MAX;
uint64_t sumAbsVal = 0;
#if SA_IMPROVED_SFM_ESTIM
uint64_t sumAbsPrv = 0;
uint64_t sumPrdCP = 0, sumPrdCC = 0, sumPrdPP = 0;
double ncp, dcc, dpp;
#endif
for (int s = SA_BW - 1; s >= 0; s--)
{
// sum absolute values of complex spectrum, derive L1 norm, peak value, and peak index
@ -287,6 +313,19 @@ unsigned SpecAnalyzer::spectralAnalysis (const int32_t* const mdctSignals[USAC_M
const uint64_t absReal = abs (bMdct[s]); // Richard Lyons, 1997; en.wikipedia.org/
const uint64_t absImag = abs (bMdst[s]); // wiki/Alpha_max_plus_beta_min_algorithm
const uint32_t absSample = uint32_t (absReal > absImag ? absReal + ((absImag * 3) >> 3) : absImag + ((absReal * 3) >> 3));
#endif
#if SA_IMPROVED_SFM_ESTIM
if (improvedSfmEstim) // correlation between current and previous magnitude spectrum
{
const uint64_t prvSample = prvMagn[s];
sumPrdCP += ((uint64_t) absSample * prvSample + anaBwOffset) >> SA_BW_SHIFT;
sumPrdCC += ((uint64_t) absSample * absSample + anaBwOffset) >> SA_BW_SHIFT;
sumPrdPP += ((uint64_t) prvSample * prvSample + anaBwOffset) >> SA_BW_SHIFT;
sumAbsPrv += prvSample;
prvMagn[s] = absSample;
}
#endif
sumAbsVal += absSample;
if (offs + s > 0) // exclude DC from max & min
@ -310,9 +349,22 @@ unsigned SpecAnalyzer::spectralAnalysis (const int32_t* const mdctSignals[USAC_M
m_bandwidthOff[ch] = __min (m_bandwidthOff[ch], nSamplesInFrame);
}
// save mean magnitude
tmp/*mean*/ = uint32_t ((sumAbsVal + (1 << (SA_BW_SHIFT - 1))) >> SA_BW_SHIFT);
tmp/*mean*/ = uint32_t ((sumAbsVal + anaBwOffset) >> SA_BW_SHIFT);
m_meanAbsValue[ch][b] = tmp;
// spectral statistics
#if SA_IMPROVED_SFM_ESTIM
if (improvedSfmEstim && (b > 0) && ((unsigned) b < lpcStopBand16k))
{
dcc = double (tmp);
dpp = double ((sumAbsPrv + anaBwOffset) >> SA_BW_SHIFT);
ncp = (sumPrdCP + dcc * dpp) * SA_BW - sumAbsVal * dpp - sumAbsPrv * dcc;
dcc = (sumPrdCC + dcc * dcc) * SA_BW - sumAbsVal * dcc - sumAbsVal * dcc;
dpp = (sumPrdPP + dpp * dpp) * SA_BW - sumAbsPrv * dpp - sumAbsPrv * dpp;
sumPrdCP = uint64_t ((ncp <= 0.0) || (dcc * dpp <= 0.0) ? 0 : 0.5 + (256.0 * ncp * ncp) / (dcc * dpp));
currMC += (uint16_t) __min (UCHAR_MAX, sumPrdCP); numMC++; // temporal correlation sum
}
#endif
if (b > 0)
{
sumAvgBand += tmp;
@ -334,6 +386,16 @@ unsigned SpecAnalyzer::spectralAnalysis (const int32_t* const mdctSignals[USAC_M
m_tnsPredGains[ch] = m_tnsPredictor->calcParCorCoeffs (&chMdct[b], __min (m_bandwidthOff[ch], lpcStopBand16k << SA_BW_SHIFT) - b,
MAX_PREDICTION_ORDER, m_parCorCoeffs[ch]);
m_specAnaStats[ch] = packAvgSpecAnalysisStats (sumAvgBand, sumMaxBand, m_tnsPredGains[ch] >> 24, idxMaxSpec, (unsigned) b >> SA_BW_SHIFT);
#if SA_IMPROVED_SFM_ESTIM
if (improvedSfmEstim)
{
if (numMC > 1) currMC = (currMC + (numMC >> 1)) / numMC;// smoothed temporal correlation
valMaxSpec = (currMC + m_magnCorrPrev[ch] + 1) >> 1;
m_magnCorrPrev[ch] = (uint8_t) currMC; // update
if (valMaxSpec > ((m_specAnaStats[ch] >> 16) & UCHAR_MAX)) m_specAnaStats[ch] = (m_specAnaStats[ch] & 0xFF00FFFF) | (valMaxSpec << 16);
}
#endif
} // for ch
return 0; // no error