int adtsWrite_EncodeHeader(HANDLE_ADTS hAdts,
HANDLE_FDK_BITSTREAM hBitStream,
int buffer_fullness,
int frame_length)
{
INT crcIndex = 0;
hAdts->headerBits = adtsWrite_GetHeaderBits(hAdts);
FDK_ASSERT(((frame_length+hAdts->headerBits)/8)<0x2000); /*13 bit*/
FDK_ASSERT(buffer_fullness<0x800); /* 11 bit */
if (!hAdts->protection_absent) {
FDKcrcReset(&hAdts->crcInfo);
}
if (hAdts->currentBlock == 0) {
FDKresetBitbuffer(hBitStream, BS_WRITER);
}
hAdts->subFrameStartBit = FDKgetValidBits(hBitStream);
/* Skip new header if this is raw data block 1..n */
if (hAdts->currentBlock == 0)
{
FDKresetBitbuffer(hBitStream, BS_WRITER);
if (hAdts->num_raw_blocks == 0) {
crcIndex = adtsWrite_CrcStartReg(hAdts, hBitStream, 0);
}
/* fixed header */
FDKwriteBits(hBitStream, 0xFFF, 12);
FDKwriteBits(hBitStream, hAdts->mpeg_id, 1);
FDKwriteBits(hBitStream, hAdts->layer, 2);
FDKwriteBits(hBitStream, hAdts->protection_absent, 1);
FDKwriteBits(hBitStream, hAdts->profile, 2);
FDKwriteBits(hBitStream, hAdts->sample_freq_index, 4);
FDKwriteBits(hBitStream, hAdts->private_bit, 1);
FDKwriteBits(hBitStream, getChannelConfig(hAdts->channel_mode), 3);
FDKwriteBits(hBitStream, hAdts->original, 1);
FDKwriteBits(hBitStream, hAdts->home, 1);
/* variable header */
FDKwriteBits(hBitStream, hAdts->copyright_id, 1);
FDKwriteBits(hBitStream, hAdts->copyright_start, 1);
FDKwriteBits(hBitStream, (frame_length + hAdts->headerBits)>>3, 13);
FDKwriteBits(hBitStream, buffer_fullness, 11);
FDKwriteBits(hBitStream, hAdts->num_raw_blocks, 2);
if (!hAdts->protection_absent) {
int i;
/* End header CRC portion for single raw data block and write dummy zero values for unknown fields. */
if (hAdts->num_raw_blocks == 0) {
adtsWrite_CrcEndReg(hAdts, hBitStream, crcIndex);
} else {
for (i=0; i<hAdts->num_raw_blocks; i++) {
FDKwriteBits(hBitStream, 0, 16);
}
}
FDKwriteBits(hBitStream, 0, 16);
}
} /* End of ADTS header */
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;
}
