void decode(BitStream inStream, DecoderConfig conf)
{
couplingPoint = 2 * inStream.readBit();
coupledCount = inStream.readBits(3);
int gainCount = 0;
for (int i = 0; i <= coupledCount; i++)
{
gainCount++;
channelPair[i] = inStream.readBool();
idSelect[i] = inStream.readBits(4);
if (channelPair[i])
{
chSelect[i] = inStream.readBits(2);
if (chSelect[i] == 3)
{
gainCount++;
}
}
else
{
chSelect[i] = 2;
}
}
couplingPoint += inStream.readBit();
couplingPoint |= (couplingPoint >> 1);
bool sign = inStream.readBool();
double scale = CCE_SCALE[inStream.readBits(2)];
ics.decode(inStream, false, conf);
ICSInfo info = ics.getInfo();
int windowGroupCount = info.getWindowGroupCount();
int maxSFB = info.getMaxSFB();
//TODO:
int[,] sfbCB = null;//ics.getSectionData().getSfbCB();
for (int i = 0; i < gainCount; i++)
{
int idx = 0;
int cge = 1;
int xg = 0;
float gainCache = 1.0f;
if (i > 0)
{
cge = couplingPoint == 2 ? 1 : inStream.readBit();
xg = cge == 0 ? 0 : Huffman.decodeScaleFactor(inStream) - 60;
gainCache = (float)Math.Pow(scale, -xg);
}
if (couplingPoint == 2)
{
gain[i, 0] = gainCache;
}
else
{
for (int g = 0; g < windowGroupCount; g++)
{
for (int sfb = 0; sfb < maxSFB; sfb++, idx++)
{
if (sfbCB[g, sfb] != ZERO_HCB)
{
if (cge == 0)
{
int t = Huffman.decodeScaleFactor(inStream) - 60;
if (t != 0)
{
int s = 1;
t = xg += t;
if (!sign)
{
s -= 2 * (t & 0x1);
t >>= 1;
}
gainCache = (float)(Math.Pow(scale, -t) * s);
}
}
gain[i, idx] = gainCache;
}
}
}
}
}
}
public void decode(BitStream inStream, DecoderConfig conf)
{
var profile = conf.getProfile();
var sf = conf.getSampleFrequency();
if (sf.getIndex() == -1)
{
throw new AACException("invalid sample frequency");
}
readElementInstanceTag(inStream);
commonWindow = inStream.readBool();
var info = icsL.getInfo();
if (commonWindow)
{
info.decode(inStream, conf, commonWindow);
icsR.getInfo().setData(info);
msMask = (MSMask)inStream.readBits(2);
if (msMask == MSMask.TYPE_USED)
{
int maxSFB = info.getMaxSFB();
int windowGroupCount = info.getWindowGroupCount();
for (int idx = 0; idx < windowGroupCount * maxSFB; idx++)
{
msUsed[idx] = inStream.readBool();
}
}
else if (msMask == MSMask.TYPE_ALL_1)
{
for (int i = 0; i < msUsed.Length; i++)
{
msUsed[i] = true;
}
}
else if (msMask == MSMask.TYPE_ALL_0)
{
for (int i = 0; i < msUsed.Length; i++)
{
msUsed[i] = false;
}
}
else
{
throw new AACException("reserved MS mask type used");
}
}
else
{
msMask = MSMask.TYPE_ALL_0;
for (int i = 0; i < msUsed.Length; i++)
{
msUsed[i] = false;
}
}
if (profile.isErrorResilientProfile() && (info.isLTPrediction1Present()))
{
if (info.ltpData2Present = inStream.readBool())
{
info.getLTPrediction2().decode(inStream, info, profile);
}
}
icsL.decode(inStream, commonWindow, conf);
icsR.decode(inStream, commonWindow, conf);
}
