AAC_DECODER_ERROR CBlock_ReadScaleFactorData(
CAacDecoderChannelInfo *pAacDecoderChannelInfo,
HANDLE_FDK_BITSTREAM bs,
UINT flags
)
{
int temp;
int band;
int group;
int position = 0; /* accu for intensity delta coding */
int factor = pAacDecoderChannelInfo->pDynData->RawDataInfo.GlobalGain; /* accu for scale factor delta coding */
UCHAR *pCodeBook = pAacDecoderChannelInfo->pDynData->aCodeBook;
SHORT *pScaleFactor = pAacDecoderChannelInfo->pDynData->aScaleFactor;
const CodeBookDescription *hcb =&AACcodeBookDescriptionTable[BOOKSCL];
int ScaleFactorBandsTransmitted = GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->icsInfo);
for (group=0; group < GetWindowGroups(&pAacDecoderChannelInfo->icsInfo); group++)
{
for (band=0; band < ScaleFactorBandsTransmitted; band++)
{
switch (pCodeBook[group*16+band]) {
case ZERO_HCB: /* zero book */
pScaleFactor[group*16+band] = 0;
break;
default: /* decode scale factor */
{
temp = CBlock_DecodeHuffmanWord(bs,hcb);
factor += temp - 60; /* MIDFAC 1.5 dB */
}
pScaleFactor[group*16+band] = factor - 100;
break;
case INTENSITY_HCB: /* intensity steering */
case INTENSITY_HCB2:
temp = CBlock_DecodeHuffmanWord(bs,hcb);
position += temp - 60;
pScaleFactor[group*16+band] = position - 100;
break;
case NOISE_HCB: /* PNS */
if (flags & (AC_MPS_RES|AC_USAC|AC_RSVD50)) {
return AAC_DEC_PARSE_ERROR;
}
CPns_Read( &pAacDecoderChannelInfo->data.aac.PnsData, bs, hcb, pAacDecoderChannelInfo->pDynData->aScaleFactor, pAacDecoderChannelInfo->pDynData->RawDataInfo.GlobalGain, band, group);
break;
}
}
}
return AAC_DEC_OK;
}
void CShortBlock_ReadScaleFactorData(HANDLE_BIT_BUF bs,
CAacDecoderChannelInfo *pAacDecoderChannelInfo,
unsigned char global_gain)
{
int temp;
int band;
int group;
int position = 0;
int factor = global_gain;
char *pCodeBook = pAacDecoderChannelInfo->pCodeBook;
short *pScaleFactor = pAacDecoderChannelInfo->pScaleFactor;
const CodeBookDescription *hcb = &HuffmanCodeBooks[BOOKSCL];
COUNT_sub_start("CShortBlock_ReadScaleFactorData");
INDIRECT(3); PTR_INIT(3); MOVE(2); /* counting previous operations */
INDIRECT(1); PTR_INIT(1); FUNC(1); LOOP(1);
for (group=0; group < GetWindowGroups(&pAacDecoderChannelInfo->IcsInfo); group++)
{
PTR_INIT(2); /* pCodeBook[]
pScaleFactor[]
*/
for (band=0; band < GetScaleFactorBandsTransmitted(&pAacDecoderChannelInfo->IcsInfo); band++)
{
BRANCH(2);
switch (pCodeBook[group*MaximumScaleFactorBandsShort+band])
{
case ZERO_HCB: /* zero book */
MOVE(1);
pScaleFactor[group*MaximumScaleFactorBandsShort+band] = 0;
break;
default: /* decode scale factor */
INDIRECT(1); FUNC(2);
temp = CBlock_DecodeHuffmanWord(bs,hcb->CodeBook);
ADD(2);
factor += temp - 60; /* MIDFAC 1.5 dB */
ADD(1); STORE(1);
pScaleFactor[group*MaximumScaleFactorBandsShort+band] = factor - 100;
break;
case INTENSITY_HCB: /* intensity steering */
case INTENSITY_HCB2:
INDIRECT(1); FUNC(2);
temp = CBlock_DecodeHuffmanWord(bs,hcb->CodeBook);
ADD(2);
position += temp - 60;
ADD(1); STORE(1);
pScaleFactor[group*MaximumScaleFactorBandsShort+band] = position - 100;
break;
case NOISE_HCB: /* PNS */
FUNC(5);
CPns_Read(pAacDecoderChannelInfo, bs, hcb, global_gain, band, group);
break;
}
}
}
COUNT_sub_end();
}