public void DecodePacket()
{
VorbisMapping.CouplingStep[] couplingSteps = _mode.Mapping.CouplingSteps;
int num = _mode.BlockSize / 2;
for (int num2 = couplingSteps.Length - 1; num2 >= 0; num2--)
{
if (_floorData[couplingSteps[num2].Angle].ExecuteChannel || _floorData[couplingSteps[num2].Magnitude].ExecuteChannel)
{
float[] array = _residue[couplingSteps[num2].Magnitude];
float[] array2 = _residue[couplingSteps[num2].Angle];
for (int i = 0; i < num; i++)
{
float num3;
float num4;
if (array[i] > 0f)
{
if (array2[i] > 0f)
{
num3 = array[i];
num4 = array[i] - array2[i];
}
else
{
num4 = array[i];
num3 = array[i] + array2[i];
}
}
else if (array2[i] > 0f)
{
num3 = array[i];
num4 = array[i] + array2[i];
}
else
{
num4 = array[i];
num3 = array[i] - array2[i];
}
array[i] = num3;
array2[i] = num4;
}
}
}
for (int j = 0; j < _channels; j++)
{
VorbisFloor.PacketData packetData = _floorData[j];
float[] array3 = _residue[j];
if (packetData.ExecuteChannel)
{
_mode.Mapping.ChannelSubmap[j].Floor.Apply(packetData, array3);
Mdct.Reverse(array3, _mode.BlockSize);
}
else
{
Array.Clear(array3, num, num);
}
}
}
static Mdct GetSetup(int n)
{
lock (_setupCache)
{
if (!_setupCache.TryGetValue(n, out var value))
{
_setupCache[n] = value = new Mdct(n);
}
return(value);
}
}
public static Mdct GetSetup(int n)
{
lock (_setupCache)
{
if (!_setupCache.ContainsKey(n))
{
_setupCache[n] = new Mdct(n);
}
return(_setupCache[n]);
}
}
static Mdct GetSetup(int n)
{
lock (_setupCache)
{
if (!_setupCache.ContainsKey(n))
{
_setupCache[n] = new Mdct(n);
}
return _setupCache[n];
}
}
private int DecodePacket(VorbisStreamDecoder.PacketDecodeInfo pdi)
{
VorbisMapping.CouplingStep[] couplingStepArray = pdi.Mode.Mapping.CouplingSteps;
int num1 = pdi.Mode.BlockSize / 2;
for (int index1 = couplingStepArray.Length - 1; index1 >= 0; --index1)
{
float[] numArray1 = pdi.Residue[couplingStepArray[index1].Magnitude];
float[] numArray2 = pdi.Residue[couplingStepArray[index1].Angle];
for (int index2 = 0; index2 < num1; ++index2)
{
float num2;
float num3;
if ((double)numArray1[index2] > 0.0)
{
if ((double)numArray2[index2] > 0.0)
{
num2 = numArray1[index2];
num3 = numArray1[index2] - numArray2[index2];
}
else
{
num3 = numArray1[index2];
num2 = numArray1[index2] + numArray2[index2];
}
}
else if ((double)numArray2[index2] > 0.0)
{
num2 = numArray1[index2];
num3 = numArray1[index2] + numArray2[index2];
}
else
{
num3 = numArray1[index2];
num2 = numArray1[index2] - numArray2[index2];
}
numArray1[index2] = num2;
numArray2[index2] = num3;
}
}
for (int index = 0; index < this._channels; ++index)
{
VorbisFloor.PacketData packetData = pdi.FloorData[index];
float[] numArray = pdi.Residue[index];
if (packetData.ExecuteChannel)
{
pdi.Mode.Mapping.ChannelSubmap[index].Floor.Apply(packetData, numArray);
Mdct.Reverse(numArray);
}
}
return(this.WindowSamples(pdi));
}
void DecodePacket()
{
// inverse coupling
var steps = _mode.Mapping.CouplingSteps;
var halfSizeW = _mode.BlockSize / 2;
for (int i = steps.Length - 1; i >= 0; i--)
{
if (_floorData[steps[i].Angle].ExecuteChannel || _floorData[steps[i].Magnitude].ExecuteChannel)
{
var magnitude = _residue[steps[i].Magnitude];
var angle = _residue[steps[i].Angle];
// we only have to do the first half; MDCT ignores the last half
for (int j = 0; j < halfSizeW; j++)
{
float newM, newA;
if (magnitude[j] > 0)
{
if (angle[j] > 0)
{
newM = magnitude[j];
newA = magnitude[j] - angle[j];
}
else
{
newA = magnitude[j];
newM = magnitude[j] + angle[j];
}
}
else
{
if (angle[j] > 0)
{
newM = magnitude[j];
newA = magnitude[j] + angle[j];
}
else
{
newA = magnitude[j];
newM = magnitude[j] - angle[j];
}
}
magnitude[j] = newM;
angle[j] = newA;
}
}
}
// apply floor / dot product / MDCT (only run if we have sound energy in that channel)
for (int c = 0; c < _channels; c++)
{
var floorData = _floorData[c];
var res = _residue[c];
if (floorData.ExecuteChannel)
{
_mode.Mapping.ChannelSubmap[c].Floor.Apply(floorData, res);
Mdct.Reverse(res, _mode.BlockSize);
}
else
{
// since we aren't doing the IMDCT, we have to explicitly clear the back half of the block
Array.Clear(res, halfSizeW, halfSizeW);
}
}
}
public static float[] Reverse(float[] samples)
{
Mdct.GetSetup(samples.Length).CalcReverse(samples);
return(samples);
}
