static
SBRDEC_DRC_CHANNEL * sbrDecoder_drcGetChannel( const HANDLE_SBRDECODER self, const INT channel )
{
SBRDEC_DRC_CHANNEL *pSbrDrcChannelData = NULL;
int elementIndex, elChanIdx=0, numCh=0;
for (elementIndex = 0; (elementIndex < (8)) && (numCh <= channel); elementIndex++)
{
SBR_DECODER_ELEMENT *pSbrElement = self->pSbrElement[elementIndex];
int c, elChannels;
elChanIdx = 0;
if (pSbrElement == NULL) break;
/* Determine amount of channels for this element */
switch (pSbrElement->elementID) {
case ID_CPE: elChannels = 2;
break;
case ID_LFE:
case ID_SCE: elChannels = 1;
break;
case ID_NONE:
default: elChannels = 0;
break;
}
/* Limit with actual allocated element channels */
elChannels = FDKmin(elChannels, pSbrElement->nChannels);
for (c = 0; (c < elChannels) && (numCh <= channel); c++) {
if (pSbrElement->pSbrChannel[elChanIdx] != NULL) {
numCh++;
elChanIdx++;
}
}
}
elementIndex -= 1;
elChanIdx -= 1;
if (elChanIdx < 0 || elementIndex < 0) {
return NULL;
}
if ( self->pSbrElement[elementIndex] != NULL ) {
if ( self->pSbrElement[elementIndex]->pSbrChannel[elChanIdx] != NULL )
{
pSbrDrcChannelData = &self->pSbrElement[elementIndex]->pSbrChannel[elChanIdx]->SbrDec.sbrDrcChannel;
}
}
return (pSbrDrcChannelData);
}
/*****************************************************************************
functionname: FDKaacEnc_InitTnsConfiguration
description: fill TNS_CONFIG structure with sensible content
returns:
input: bitrate, samplerate, number of channels,
blocktype (long or short),
TNS Config struct (modified),
psy config struct,
tns active flag
output:
*****************************************************************************/
AAC_ENCODER_ERROR FDKaacEnc_InitTnsConfiguration(INT bitRate,
INT sampleRate,
INT channels,
INT blockType,
INT granuleLength,
INT ldSbrPresent,
TNS_CONFIG *tC,
PSY_CONFIGURATION *pC,
INT active,
INT useTnsPeak)
{
int i;
//float acfTimeRes = (blockType == SHORT_WINDOW) ? 0.125f : 0.046875f;
if (channels <= 0)
return (AAC_ENCODER_ERROR)1;
/* initialize TNS filter flag, order, and coefficient resolution (in bits per coeff) */
tC->tnsActive = (active) ? TRUE : FALSE;
tC->maxOrder = (blockType == SHORT_WINDOW) ? 5 : 12; /* maximum: 7, 20 */
if (bitRate < 16000)
tC->maxOrder -= 2;
tC->coefRes = (blockType == SHORT_WINDOW) ? 3 : 4;
/* LPC stop line: highest MDCT line to be coded, but do not go beyond TNS_MAX_BANDS! */
tC->lpcStopBand = getTnsMaxBands(sampleRate, granuleLength, (blockType == SHORT_WINDOW) ? 1 : 0);
if (tC->lpcStopBand < 0) {
return (AAC_ENCODER_ERROR)1;
}
tC->lpcStopBand = FDKmin(tC->lpcStopBand, pC->sfbActive);
tC->lpcStopLine = pC->sfbOffset[tC->lpcStopBand];
switch (granuleLength) {
case 1024:
/* TNS start line: skip lower MDCT lines to prevent artifacts due to filter mismatch */
tC->lpcStartBand[LOFILT] = (blockType == SHORT_WINDOW) ? 0 : ((sampleRate < 18783) ? 4 : 8);
tC->lpcStartLine[LOFILT] = pC->sfbOffset[tC->lpcStartBand[LOFILT]];
i = tC->lpcStopBand;
while (pC->sfbOffset[i] > (tC->lpcStartLine[LOFILT] + (tC->lpcStopLine - tC->lpcStartLine[LOFILT]) / 4)) i--;
tC->lpcStartBand[HIFILT] = i;
tC->lpcStartLine[HIFILT] = pC->sfbOffset[i];
tC->confTab.threshOn[HIFILT] = 1437;
tC->confTab.threshOn[LOFILT] = 1500;
tC->confTab.tnsLimitOrder[HIFILT] = tC->maxOrder;
tC->confTab.tnsLimitOrder[LOFILT] = tC->maxOrder - 7;
tC->confTab.tnsFilterDirection[HIFILT] = FILTER_DIRECTION;
tC->confTab.tnsFilterDirection[LOFILT] = FILTER_DIRECTION;
tC->confTab.acfSplit[HIFILT] = -1; /* signal Merged4to2QuartersAutoCorrelation in FDKaacEnc_MergedAutoCorrelation*/
tC->confTab.acfSplit[LOFILT] = -1; /* signal Merged4to2QuartersAutoCorrelation in FDKaacEnc_MergedAutoCorrelation */
tC->confTab.filterEnabled[HIFILT] = 1;
tC->confTab.filterEnabled[LOFILT] = 1;
tC->confTab.seperateFiltersAllowed = 1;
/* compute autocorrelation window based on maximum filter order for given block type */
/* for (i = 0; i <= tC->maxOrder + 3; i++) {
float acfWinTemp = acfTimeRes * i;
acfWindow[i] = FL2FXCONST_DBL(1.0f - acfWinTemp * acfWinTemp);
}
*/
if (blockType == SHORT_WINDOW) {
FDKmemcpy(tC->acfWindow[HIFILT], acfWindowShort, FDKmin(sizeof(acfWindowShort), sizeof(tC->acfWindow[HIFILT])));
FDKmemcpy(tC->acfWindow[LOFILT], acfWindowShort, FDKmin(sizeof(acfWindowShort), sizeof(tC->acfWindow[HIFILT])));
}
else {
FDKmemcpy(tC->acfWindow[HIFILT], acfWindowLong, FDKmin(sizeof(acfWindowLong), sizeof(tC->acfWindow[HIFILT])));
FDKmemcpy(tC->acfWindow[LOFILT], acfWindowLong, FDKmin(sizeof(acfWindowLong), sizeof(tC->acfWindow[HIFILT])));
}
break;
case 480:
case 512:
{
const TNS_PARAMETER_TABULATED* pCfg = FDKaacEnc_GetTnsParam(bitRate, channels, ldSbrPresent);
if ( pCfg != NULL ) {
tC->lpcStartBand[HIFILT] = FDKaacEnc_FreqToBandWithRounding(pCfg->filterStartFreq[HIFILT], sampleRate, pC->sfbCnt, pC->sfbOffset);
tC->lpcStartLine[HIFILT] = pC->sfbOffset[tC->lpcStartBand[HIFILT]];
tC->lpcStartBand[LOFILT] = FDKaacEnc_FreqToBandWithRounding(pCfg->filterStartFreq[LOFILT], sampleRate, pC->sfbCnt, pC->sfbOffset);
tC->lpcStartLine[LOFILT] = pC->sfbOffset[tC->lpcStartBand[LOFILT]];
tC->confTab.threshOn[HIFILT] = pCfg->threshOn[HIFILT];
tC->confTab.threshOn[LOFILT] = pCfg->threshOn[LOFILT];
tC->confTab.tnsLimitOrder[HIFILT] = pCfg->tnsLimitOrder[HIFILT];
tC->confTab.tnsLimitOrder[LOFILT] = pCfg->tnsLimitOrder[LOFILT];
tC->confTab.tnsFilterDirection[HIFILT] = pCfg->tnsFilterDirection[HIFILT];
tC->confTab.tnsFilterDirection[LOFILT] = pCfg->tnsFilterDirection[LOFILT];
tC->confTab.acfSplit[HIFILT] = pCfg->acfSplit[HIFILT];
tC->confTab.acfSplit[LOFILT] = pCfg->acfSplit[LOFILT];
tC->confTab.filterEnabled[HIFILT] = pCfg->filterEnabled[HIFILT];
tC->confTab.filterEnabled[LOFILT] = pCfg->filterEnabled[LOFILT];
tC->confTab.seperateFiltersAllowed = pCfg->seperateFiltersAllowed;
FDKaacEnc_CalcGaussWindow(tC->acfWindow[HIFILT], tC->maxOrder+1, sampleRate, granuleLength, pCfg->tnsTimeResolution[HIFILT], TNS_TIMERES_SCALE);
FDKaacEnc_CalcGaussWindow(tC->acfWindow[LOFILT], tC->maxOrder+1, sampleRate, granuleLength, pCfg->tnsTimeResolution[LOFILT], TNS_TIMERES_SCALE);
}
else {
tC->tnsActive = FALSE; /* no configuration available, disable tns tool */
}
}
break;
default:
tC->tnsActive = FALSE; /* no configuration available, disable tns tool */
}
return AAC_ENC_OK;
}
TRANSPORTENC_ERROR transportEnc_WriteAccessUnit(
HANDLE_TRANSPORTENC hTp,
INT frameUsedBits,
int bufferFullness,
int ncc
)
{
TRANSPORTENC_ERROR err = TRANSPORTENC_OK;
if (!hTp) {
return TRANSPORTENC_INVALID_PARAMETER;
}
HANDLE_FDK_BITSTREAM hBs = &hTp->bitStream;
/* In case of writing PCE in raw_data_block frameUsedBits must be adapted. */
if (hTp->pceFrameCounter>=hTp->config.headerPeriod) {
frameUsedBits += transportEnc_GetPCEBits(hTp->config.channelMode, hTp->config.matrixMixdownA, 3); /* Consider 3 bits ID signalling in alignment */
}
switch (hTp->transportFmt) {
case TT_MP4_ADIF:
FDKinitBitStream(&hTp->bitStream, hTp->bsBuffer, hTp->bsBufferSize, 0, BS_WRITER);
adifWrite_EncodeHeader(
&hTp->writer.adif,
hBs,
bufferFullness
);
break;
case TT_MP4_ADTS:
bufferFullness /= ncc; /* Number of Considered Channels */
bufferFullness /= 32;
bufferFullness = FDKmin(0x7FF, bufferFullness); /* Signal variable rate */
adtsWrite_EncodeHeader(
&hTp->writer.adts,
&hTp->bitStream,
bufferFullness,
frameUsedBits
);
break;
case TT_DABPLUS:
bufferFullness /= ncc; /* Number of Considered Channels */
bufferFullness /= 32;
bufferFullness = FDKmin(0x7FF, bufferFullness); /* Signal variable rate */
dabWrite_EncodeHeader(
&hTp->writer.dab,
&hTp->bitStream,
bufferFullness,
frameUsedBits
);
break;
case TT_MP4_LOAS:
case TT_MP4_LATM_MCP0:
case TT_MP4_LATM_MCP1:
bufferFullness /= ncc; /* Number of Considered Channels */
bufferFullness /= 32;
bufferFullness = FDKmin(0xFF, bufferFullness); /* Signal variable rate */
transportEnc_LatmWrite(
&hTp->writer.latm,
hBs,
frameUsedBits,
bufferFullness,
&hTp->callbacks
);
break;
case TT_MP4_RAW:
if (hTp->writer.raw.curSubFrame >= hTp->writer.raw.nSubFrames) {
hTp->writer.raw.curSubFrame = 0;
FDKinitBitStream(&hTp->bitStream, hTp->bsBuffer, hTp->bsBufferSize, 0, BS_WRITER);
}
hTp->writer.raw.prevBits = FDKgetValidBits(hBs);
break;
default:
err = TRANSPORTENC_UNSUPPORTED_FORMAT;
break;
}
/* Write PCE in raw_data_block if required */
if (hTp->pceFrameCounter>=hTp->config.headerPeriod) {
INT crcIndex = 0;
/* Align inside PCE with repsect to the first bit of the raw_data_block() */
UINT alignAnchor = FDKgetValidBits(&hTp->bitStream);
/* Write PCE element ID bits */
FDKwriteBits(&hTp->bitStream, ID_PCE, 3);
if ( (hTp->transportFmt==TT_MP4_ADTS) && !hTp->writer.adts.protection_absent) {
crcIndex = adtsWrite_CrcStartReg(&hTp->writer.adts, &hTp->bitStream, 0);
}
/* Write PCE as first raw_data_block element */
transportEnc_writePCE(&hTp->bitStream, hTp->config.channelMode, hTp->config.samplingRate, 0, 1, hTp->config.matrixMixdownA, hTp->config.flags & CC_PSEUDO_SURROUND, alignAnchor);
if ( (hTp->transportFmt==TT_MP4_ADTS) && !hTp->writer.adts.protection_absent) {
adtsWrite_CrcEndReg(&hTp->writer.adts, &hTp->bitStream, crcIndex);
}
hTp->pceFrameCounter = 0; /* reset pce frame counter */
}
if (hTp->pceFrameCounter!=-1) {
hTp->pceFrameCounter++; /* Update pceFrameCounter only if PCE writing is active. */
}
return err;
}
