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3-subband SBR mode

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This commit is contained in:
Christian R. Helmrich
2020-12-29 01:00:22 +01:00
parent 4002bff2bf
commit f8d15db9fc
5 changed files with 167 additions and 62 deletions
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57
src/lib/bitStreamWriter.cpp
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@ -60,6 +60,19 @@ static uint32_t getDeltaCodeTimeFlag (const uint8_t* const alphaQCurr, const uns
return (bitCountFreq > bitCountTime ? 1 : 0);
}
static uint8_t getNumEnvBits (const int32_t int32Value, const uint8_t maxBitCount, const uint8_t minBitCount)
{
uint8_t bits = __max (1, maxBitCount);
int32_t mask = 1 << (bits - 1);
while (bits > minBitCount && (int32Value & mask) == 0) // get MSB
{
bits--;
mask >>= 1;
}
return bits;
}
static uint8_t getOptMsMaskModeValue (const uint8_t* const msUsed, const unsigned numWinGroups, const unsigned numSwbShort,
const uint8_t msMaskMode, const unsigned maxSfbSte)
{
@ -128,14 +141,12 @@ unsigned BitStreamWriter::writeChannelWiseSbrData (const int32_t* const sbrDataC
#endif
const bool couple = (((ch1 >> 23) & 1) != 0);
unsigned bitCount = (stereo ? (couple ? 2 : 7 + nb) : 0) + 6 + nb;
unsigned i, envCh0, envCh1, resCh0, resCh1; // bs_num_env[], bs_freq_res[]
unsigned i, envCh0, envCh1; // bs_num_env[], 1 - 8
if (nb == 0) return 0;
envCh0 = 1 << ((ch0 >> 21) & 3);
resCh0 = (ch0 >> 20) & 1;
envCh1 = 1 << (((stereo && !couple ? ch1 : ch0) >> 21) & 3);
resCh1 = ((stereo && !couple ? ch1 : ch0) >> 20) & 1;
if (stereo) m_auBitStream.write (couple ? 1 : 0, 1); // _coupling
@ -166,12 +177,14 @@ unsigned BitStreamWriter::writeChannelWiseSbrData (const int32_t* const sbrDataC
for (i = 1; i <= envCh0; i++) // dt loop
{
const uint8_t bits = ((ch0 & (1 << (11 + i))) != 0 ? 2 : (res > 0 && envCh0 > 1 ? 6 : 7));
const uint8_t bitd = (2 + 3 * resCh0) * 2; // differential, <25 TODO: VLC words
uint8_t nCodedBits = getNumEnvBits (sbrDataCh0[i], 8, bits);
m_auBitStream.write (sbrDataCh0[i] & 127, bits); // bs_data_env
bitCount += bits;
m_auBitStream.write ((sbrDataCh0[i] >> 7) & ((1 << bitd) - 1), bitd);
bitCount += bitd;
m_auBitStream.write (sbrDataCh0[i] & ((1 << nCodedBits) - 1), nCodedBits); // 1st env.
bitCount += nCodedBits;
nCodedBits = getNumEnvBits (sbrDataCh0[i], 32, 9) - 9; // avoid writing MSB delimiter
m_auBitStream.write ((sbrDataCh0[i] >> 8) & ((1 << nCodedBits) - 1), nCodedBits);
bitCount += nCodedBits;
#if ENABLE_INTERTES
if (issTes)
{
@ -191,12 +204,14 @@ unsigned BitStreamWriter::writeChannelWiseSbrData (const int32_t* const sbrDataC
for (i = 1; i <= envCh1; i++) // decoup. sbr_envelope() dt loop
{
const uint8_t bits = ((ch1 & (1 << (11 + i))) != 0 ? 2 : (res > 0 && envCh1 > 1 ? 6 : 7));
const uint8_t bitd = (2 + 3 * resCh1) * 2; // TODO: VLC words
uint8_t nCodedBits = getNumEnvBits (sbrDataCh1[i], 8, bits);
m_auBitStream.write (sbrDataCh1[i] & 127, bits);
bitCount += bits;
m_auBitStream.write ((sbrDataCh1[i] >> 7) & ((1 << bitd) - 1), bitd);
bitCount += bitd;
m_auBitStream.write (sbrDataCh1[i] & ((1 << nCodedBits) - 1), nCodedBits);
bitCount += nCodedBits;
nCodedBits = getNumEnvBits (sbrDataCh1[i], 32, 9) - 9;
m_auBitStream.write ((sbrDataCh1[i] >> 8) & ((1 << nCodedBits) - 1), nCodedBits);
bitCount += nCodedBits;
#if ENABLE_INTERTES
if (issTes)
{
@ -221,7 +236,7 @@ unsigned BitStreamWriter::writeChannelWiseSbrData (const int32_t* const sbrDataC
bitCount += bits;
if (nb == 4)
{
m_auBitStream.write ((sbrDataCh0[9] >> (13 * i - 5)) & 31, 1); // TODO: VLC word
m_auBitStream.write ((sbrDataCh0[9] >> (13 * i - 5)) & 31, 1);
bitCount++;
}
}
@ -233,12 +248,14 @@ unsigned BitStreamWriter::writeChannelWiseSbrData (const int32_t* const sbrDataC
for (i = 1; i <= envCh1; i++) // coup. sbr_envelope() dt loop
{
const uint8_t bits = ((ch1 & (1 << (11 + i))) != 0 ? 1 : (res > 0 && envCh1 > 1 ? 5 : 6));
const uint8_t bitd = (2 + 3 * resCh1) * 1; // TODO: VLC words
uint8_t nCodedBits = getNumEnvBits (sbrDataCh1[i], 8, bits);
m_auBitStream.write (sbrDataCh1[i] & 63, bits);
bitCount += bits;
m_auBitStream.write ((sbrDataCh1[i] >> 7) & ((1 << bitd) - 1), bitd);
bitCount += bitd;
m_auBitStream.write (sbrDataCh1[i] & ((1 << nCodedBits) - 1), nCodedBits);
bitCount += nCodedBits;
nCodedBits = getNumEnvBits (sbrDataCh1[i], 32, 9) - 9;
m_auBitStream.write ((sbrDataCh1[i] >> 8) & ((1 << nCodedBits) - 1), nCodedBits);
bitCount += nCodedBits;
#if ENABLE_INTERTES
if (issTes)
{
@ -262,7 +279,7 @@ unsigned BitStreamWriter::writeChannelWiseSbrData (const int32_t* const sbrDataC
bitCount += bits;
if (nb == 4)
{
m_auBitStream.write ((sbrDataCh1[9] >> (13 * i - 5)) & 31, 1); // TODO: VLC word
m_auBitStream.write ((sbrDataCh1[9] >> (13 * i - 5)) & 31, 1);
bitCount++;
}
}