bool init ( BitReader br )
{
br.reset();
if ( br.getByte() != 0x64
|| br.getByte() != 0x58
|| br.getByte() != 0x20
|| br.getByte() != 0x25 )
{
return false;
}
// * dca.c dca_exss_parse_header
br.skip(8); // user data
_ssIndex = br.getInt(2);
bool blownUp(br.getBool());
_headerSize = br.getInt(blownUp ? 12 : 8);
//hdLen = ((hdHdr[6] & 0xf) << 11) + (hdHdr[7] << 3) + ((hdHdr[8] >> 5) & 7) + 1;
_hdSize = br.getInt(blownUp ? 20: 16) + 1;
return true;
}
bool init ( BitReader br )
{
br.reset();
// 16 bit formats
if ( br.getByte() == 0x7f
&& br.getByte() == 0xfe
&& br.getByte() == 0x80
&& br.getByte() == 0x01 )
{
_is14Bit = false;
}
else
{
// 14 bit formats
br.reset();
if (br.getByte() == 0x1f
&& br.getByte() == 0xff
&& br.getByte() == 0xe8
&& br.getByte() == 0x00
&& br.getByte() == 0x07
&& br.getByte(4) == 0xf)
{
_is14Bit = true;
/*
* The original code was this, not sure I can parse the 14bit the same as the
* 16 bit, but I can look at that later if there are problems
sampleBlocks = ((be2uint16(hdr16[2]) << 4) & 0x70)
| ((be2uint16(hdr16[3]) >> 10) & 0x0f);
++sampleBlocks;
amode = (be2uint16(hdr16[4]) >> 4) & 0x3f;
sfreq = (be2uint16(hdr16[4]) >> 0) & 0x0f;
lfe = (be2uint16(hdr16[6]) >> 11) & 0x03;
*/
}
else
{
return false; // invalid frame data
}
}
_isNormalFrame = br.getBool(); // 1
_shortSamples = br.getInt(5); // 6
_isCrcPresent = br.getBool(); // 7
_sampleBlocks = br.getInt(7) + 1; // 14
_frameSize = br.getInt(14) + 1; // 28
_channelLayout = br.getInt(6);
_sampleIndex = br.getInt(4);
_bitRate = br.getInt(5);
_downMix = br.getBool();
_dynamicRange = br.getBool();
_timeStamp = br.getBool();
_auxiliaryData = br.getBool();
_hdcd = br.getBool();
_externalDescription = br.getInt(3);
_externalCoding = br.getBool();
_aspf = br.getBool();
_lfe = br.getInt(2);
_predictorHistory = br.getBool();
if ( _isCrcPresent )
_crc = br.getInt(16);
_multirateInter = br.getBool();
_version = br.getInt(4);
_copyHistory = br.getInt(2);
_sourcePcmResolution = br.getInt(3);
_frontSum = br.getBool();
_surroundSum = br.getBool();
_dialogNormalization = br.getInt(4);
return true;
}