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SBR temporal res.

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This commit is contained in:
Christian R. Helmrich
2020-11-17 22:00:00 +01:00
parent 1281acbe66
commit 6fe06fa78b
3 changed files with 93 additions and 12 deletions
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94
src/lib/exhaleEnc.cpp
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@@ -1073,7 +1073,10 @@ unsigned ExhaleEncoder::quantizationCoding () // apply MDCT quantization and en
// get means of spectral and temporal flatness for every channel // get means of spectral and temporal flatness for every channel
m_bitAllocator.getChAverageSpecFlat (meanSpecFlat, nChannels); m_bitAllocator.getChAverageSpecFlat (meanSpecFlat, nChannels);
if (m_bitRateMode == 0 && samplingRate >= 23004) m_bitAllocator.getChAverageTempFlat (meanTempFlat, nChannels); if ((m_bitRateMode < (2u >> m_shiftValSBR)) && (samplingRate >= 23004) && (samplingRate < 37566))
{
m_bitAllocator.getChAverageTempFlat (meanTempFlat, nChannels);
}
for (unsigned el = 0; el < m_numElements; el++) // element loop for (unsigned el = 0; el < m_numElements; el++) // element loop
{ {
@@ -1300,28 +1303,95 @@ unsigned ExhaleEncoder::quantizationCoding () // apply MDCT quantization and en
#endif #endif
if ((coreConfig.elementType < ID_USAC_LFE) && (m_shiftValSBR > 0)) // collect SBR data if ((coreConfig.elementType < ID_USAC_LFE) && (m_shiftValSBR > 0)) // collect SBR data
{ {
int32_t* const sbrLevel = &m_coreSignals[ci][nSamplesTempAna - 64 + nSamplesInFrame]; const uint8_t msfVal = (shortWinPrev ? 31 : __max (2, __max (m_meanFlatPrev[ci], meanSpecFlat[ci]) >> 3));
memset (m_coreSignals[ci], 0, 10 * sizeof (int32_t)); // TODO memset (m_coreSignals[ci], 0, 10 * sizeof (int32_t));
#if ENABLE_INTERTES #if ENABLE_INTERTES
m_coreSignals[ci][0] = (shortWinPrev ? 0x40000000 : 0x40100000); // freq_res, interTes m_coreSignals[ci][0] = (shortWinPrev ? 0x40000000 : 0x40100000); // freq_res, interTes
#else #else
m_coreSignals[ci][0] = (shortWinPrev ? 0 : 1) << 20; // bs_freq_res = low resp. high m_coreSignals[ci][0] = (shortWinPrev ? 0 : 1) << 20; // bs_freq_res = low resp. high
#endif #endif
const int32_t msfVal = (shortWinPrev ? 31 : __max (2, __max (m_meanFlatPrev[ci], meanSpecFlat[ci]) >> 3));
m_meanFlatPrev[ci] = meanSpecFlat[ci];
m_coreSignals[ci][9] = (msfVal << 13) | (msfVal << 26); // noise level(s), 31 = none
m_coreSignals[ci][0] |= 4 - int32_t (sqrt (0.75 * msfVal)); // filter mode, 0 = none m_coreSignals[ci][0] |= 4 - int32_t (sqrt (0.75 * msfVal)); // filter mode, 0 = none
#if 1
// TODO: start putting into function
int32_t* const sbrLevel = &m_coreSignals[ci][nSamplesTempAna - 64 + nSamplesInFrame];
uint64_t enValues[8] = {(uint64_t) sbrLevel[22] * (uint64_t) sbrLevel[22], (uint64_t) sbrLevel[23] * (uint64_t) sbrLevel[23],
(uint64_t) sbrLevel[24] * (uint64_t) sbrLevel[24], (uint64_t) sbrLevel[25] * (uint64_t) sbrLevel[25],
(uint64_t) sbrLevel[26] * (uint64_t) sbrLevel[26], (uint64_t) sbrLevel[27] * (uint64_t) sbrLevel[27],
(uint64_t) sbrLevel[28] * (uint64_t) sbrLevel[28], (uint64_t) sbrLevel[11] * (uint64_t) sbrLevel[11]};
uint64_t envTmp0[1] = { enValues[0] + enValues[1] + enValues[2] + enValues[3] +
enValues[4] + enValues[5] + enValues[6] + enValues[7]};
uint64_t envTmp1[2] = {(enValues[0] + enValues[1] + enValues[2] + enValues[3]) << 1,
(enValues[4] + enValues[5] + enValues[6] + enValues[7]) << 1};
uint64_t envTmp2[4] = {(enValues[0] + enValues[1]) << 2, (enValues[2] + enValues[3]) << 2,
(enValues[4] + enValues[5]) << 2, (enValues[6] + enValues[7]) << 2};
uint64_t envTmp3[8] = { enValues[0] << 3, enValues[1] << 3, enValues[2] << 3, enValues[3] << 3,
enValues[4] << 3, enValues[5] << 3, enValues[6] << 3, enValues[7] << 3};
uint64_t errTmp[4] = {0, 0, 0, 0};
uint64_t errBest;
int32_t tmpBest;
const uint64_t enAdd = (uint64_t) sbrLevel[11] * (uint64_t) sbrLevel[11]; // envelope for (int unit = 0; unit < 8; unit++)
const uint64_t enSub = (uint64_t) sbrLevel[21] * (uint64_t) sbrLevel[21]; // 1.9 frms {
const uint64_t enSum = (uint64_t) sbrLevel[20] * (uint64_t) sbrLevel[20]; // of delay const int64_t ref = enValues[unit] << 3;
const uint64_t enAdj = (enSum + enAdd - enSub + (nSamplesInFrame >> 1)) / nSamplesInFrame;
m_coreSignals[ci][1] = (enAdj > 8192 ? int32_t (1.375 - 0.03125 * msfVal + 6.64385619 * log10 ((double) enAdj)) - 26 : 0); errTmp[0] += abs ((int64_t) envTmp0[unit >> 3] - ref); // abs() since
errTmp[1] += abs ((int64_t) envTmp1[unit >> 2] - ref); // both values
errTmp[2] += abs ((int64_t) envTmp2[unit >> 1] - ref); // are already
errTmp[3] += abs ((int64_t) envTmp3[unit >> 0] - ref); // squares
}
errBest = errTmp[0]; // find tmp value providing minimal weighted error
tmpBest = 0;
for (uint8_t t = 1; t < 3; t++)
{
if ((errTmp[t] << t) < errBest)
{
errBest = errTmp[t] << t;
tmpBest = t;
}
}
if ((errBest >> 3) > envTmp0[0]) tmpBest = (m_bitRateMode == 0 ? 2 : 3);
/*quant.*/ if (tmpBest == 0)
{
m_coreSignals[ci][1] = quantizeSbrEnvelopeLevel (envTmp0[0], nSamplesInFrame, msfVal);
}
else if (tmpBest == 1)
{
m_coreSignals[ci][1] = quantizeSbrEnvelopeLevel (envTmp1[0], nSamplesInFrame, msfVal);
m_coreSignals[ci][2] = quantizeSbrEnvelopeLevel (envTmp1[1], nSamplesInFrame, msfVal);
}
else if (tmpBest == 2)
{
m_coreSignals[ci][1] = quantizeSbrEnvelopeLevel (envTmp2[0], nSamplesInFrame, msfVal);
m_coreSignals[ci][2] = quantizeSbrEnvelopeLevel (envTmp2[1], nSamplesInFrame, msfVal);
m_coreSignals[ci][3] = quantizeSbrEnvelopeLevel (envTmp2[2], nSamplesInFrame, msfVal);
m_coreSignals[ci][4] = quantizeSbrEnvelopeLevel (envTmp2[3], nSamplesInFrame, msfVal);
}
else // (tmpBest == 3)
{
m_coreSignals[ci][1] = quantizeSbrEnvelopeLevel (envTmp3[0], nSamplesInFrame, msfVal);
m_coreSignals[ci][2] = quantizeSbrEnvelopeLevel (envTmp3[1], nSamplesInFrame, msfVal);
m_coreSignals[ci][3] = quantizeSbrEnvelopeLevel (envTmp3[2], nSamplesInFrame, msfVal);
m_coreSignals[ci][4] = quantizeSbrEnvelopeLevel (envTmp3[3], nSamplesInFrame, msfVal);
m_coreSignals[ci][5] = quantizeSbrEnvelopeLevel (envTmp3[4], nSamplesInFrame, msfVal);
m_coreSignals[ci][6] = quantizeSbrEnvelopeLevel (envTmp3[5], nSamplesInFrame, msfVal);
m_coreSignals[ci][7] = quantizeSbrEnvelopeLevel (envTmp3[6], nSamplesInFrame, msfVal);
m_coreSignals[ci][8] = quantizeSbrEnvelopeLevel (envTmp3[7], nSamplesInFrame, msfVal);
}
m_coreSignals[ci][9] = ((int32_t) msfVal << 13) | ((int32_t) msfVal << 26); // noise level(s), 31 = none
# if ENABLE_INTERTES
// m_auBitStream.write ((m_coreSignals[ci][9] >> (i=0..(1 << tmpBest)-1)) & 1, 1); // bs_temp_shape[ch][env=i]
# endif
memcpy (&sbrLevel[20], &sbrLevel[10] /*last*/, 10 * sizeof (int32_t)); memcpy (&sbrLevel[20], &sbrLevel[10] /*last*/, 10 * sizeof (int32_t));
memcpy (&sbrLevel[10], sbrLevel /*& current*/, 10 * sizeof (int32_t)); // delay line memcpy (&sbrLevel[10], sbrLevel /*& current*/, 10 * sizeof (int32_t)); // delay line
// TODO: end putting into function
#endif
m_coreSignals[ci][0] |= tmpBest /* TODO: call function here, returning tmpBest */ << 21;
m_meanFlatPrev[ci] = meanSpecFlat[ci];
} }
ci++; ci++;
} }

8
src/lib/exhaleLibPch.cpp
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@@ -52,6 +52,14 @@ static const unsigned allowedSamplingRates[USAC_NUM_SAMPLE_RATES] = {
57600, 51200, 40000, 38400, 34150, 28800, 25600, 20000, 19200, 17075, 14400, 12800, 9600 // USAC 57600, 51200, 40000, 38400, 34150, 28800, 25600, 20000, 19200, 17075, 14400, 12800, 9600 // USAC
}; };
// public SBR related functions
int8_t quantizeSbrEnvelopeLevel (const uint64_t energy, const unsigned divisor, const uint8_t noiseLevel)
{
const double ener = (double) energy / (double) divisor;
return (ener > 8192.0 ? int8_t (1.375 - 0.03125 * noiseLevel + 6.64385619 * log10 (ener)) - 26 : 0);
}
// public sampling rate functions // public sampling rate functions
int8_t toSamplingFrequencyIndex (const unsigned samplingRate) int8_t toSamplingFrequencyIndex (const unsigned samplingRate)
{ {

3
src/lib/exhaleLibPch.h
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@@ -196,6 +196,9 @@ static const ELEM_TYPE elementTypeConfig[USAC_MAX_NUM_ELCONFIGS][USAC_MAX_NUM_EL
// fast calculation of x / den: (x * oneTwentyEightOver[den]) >> 7, accurate for 0 <= x <= 162 // fast calculation of x / den: (x * oneTwentyEightOver[den]) >> 7, accurate for 0 <= x <= 162
const uint8_t oneTwentyEightOver[14] = {0, 128, 64, 43, 32, 26, 22, 19, 16, 15, 13, 12, 11, 10}; const uint8_t oneTwentyEightOver[14] = {0, 128, 64, 43, 32, 26, 22, 19, 16, 15, 13, 12, 11, 10};
// public SBR related functions
int8_t quantizeSbrEnvelopeLevel (const uint64_t energy, const unsigned divisor, const uint8_t noiseLevel);
// public sampling rate functions // public sampling rate functions
int8_t toSamplingFrequencyIndex (const unsigned samplingRate); int8_t toSamplingFrequencyIndex (const unsigned samplingRate);
unsigned toSamplingRate (const int8_t samplingFrequencyIndex); unsigned toSamplingRate (const int8_t samplingFrequencyIndex);