public ICStream(int frameLength)
{
this.frameLength = frameLength;
info = new ICSInfo(frameLength);
sfbCB = new int[MAX_SECTIONS];
sectEnd = new int[MAX_SECTIONS];
data = new float[frameLength];
scaleFactors = new float[MAX_SECTIONS];
}
public void decode(BitStream inStream, ICSInfo info, Profile profile)
{
lag = 0;
if (profile.type == Profile.ProfileType.AAC_LD)
{
lagUpdate = inStream.readBool();
if (lagUpdate)
{
lag = inStream.readBits(10);
}
}
else
{
lag = inStream.readBits(11);
}
if (lag > (frameLength << 1))
{
throw new AACException("LTP lag too large: " + lag);
}
coef = inStream.readBits(3);
int windowCount = info.getWindowCount();
if (info.isEightShortFrame())
{
shortUsed = new bool[windowCount];
shortLagPresent = new bool[windowCount];
shortLag = new int[windowCount];
for (int w = 0; w < windowCount; w++)
{
if (shortUsed[w] = inStream.readBool())
{
shortLagPresent[w] = inStream.readBool();
if (shortLagPresent[w])
{
shortLag[w] = inStream.readBits(4);
}
}
}
}
else
{
lastBand = Math.Min(info.getMaxSFB(), MAX_LTP_SFB);
longUsed = new bool[lastBand];
for (int i = 0; i < lastBand; i++)
{
longUsed[i] = inStream.readBool();
}
}
}
public void setData(ICSInfo info)
{
windowSequence = info.windowSequence;
windowShape[PREVIOUS] = windowShape[CURRENT];
windowShape[CURRENT] = info.windowShape[CURRENT];
maxSFB = info.maxSFB;
predictionDataPresent = info.predictionDataPresent;
if (predictionDataPresent)
{
icPredict = info.icPredict;
}
ltpData1Present = info.ltpData1Present;
if (ltpData1Present)
{
throw new NotImplementedException();
//ltPredict1.copy(info.ltPredict1);
//ltPredict2.copy(info.ltPredict2);
}
windowCount = info.windowCount;
windowGroupCount = info.windowGroupCount;
windowGroupLength = info.windowGroupLength.ToArray();
swbCount = info.swbCount;
swbOffsets = info.swbOffsets.ToArray();
}
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;
}
}
}
}
}
}
