private static void ComputeOriginalLL3FromDeltas(short[] input, bool useReduceExtrapolate)
{
int ll3Len = RdpegfxTileUtils.GetBandSize(BandType_Values.LL3, useReduceExtrapolate);
int ll3Idx = RdpegfxTileUtils.ComponentElementCount - ll3Len;
for (int i = ll3Idx + 1; i < RdpegfxTileUtils.ComponentElementCount; i++)
{
input[i] = (short)(input[i] + input[i - 1]);
}
}
private static void ComputeLL3Deltas(Triplet <short[]> input, bool UseReduceExtrapolate)
{
int ll3Len = RdpegfxTileUtils.GetBandSize(BandType_Values.LL3, UseReduceExtrapolate);
int ll3Idx = RdpegfxTileUtils.ComponentElementCount - ll3Len;
//for (int i = ll3Idx + 1; i < TileUtils.ComponentElementCount; i++)
for (int i = RdpegfxTileUtils.ComponentElementCount - 1; i >= ll3Idx + 1; i--)
{
foreach (var component in input)
{
component[i] = (short)(component[i] - component[i - 1]);
}
}
}
// Should maintain a LastFrame
public static void SubBandDiffing(Triplet <short[]> input, Triplet <short[]> lastFrame, bool UseReduceExtrapolate, out Triplet <short[]> output, out bool useDiffing)
{
// According to TD SubBandDiffing step is mandatory and in SubBandDiffing decide whether or not use diffing
short[] x, y, z;
output = null;
if (lastFrame == null)
{
x = new short[input.X.Length];
Array.Copy(input.X, x, input.X.Length);
y = new short[input.Y.Length];
Array.Copy(input.Y, y, input.Y.Length);
z = new short[input.Z.Length];
Array.Copy(input.Z, z, input.Z.Length);
output = new Triplet <short[]>(x, y, z);
useDiffing = false;
}
else
{
short[] yDiffDwt, cbDiffDwt, crDiffDwt;
int lenOfNonLL3Band = (RdpegfxTileUtils.ComponentElementCount - RdpegfxTileUtils.GetBandSize(BandType_Values.LL3, UseReduceExtrapolate));// ? 81 : 64;
int yNewZeroCount, cbNewZeroCount, crNewZeroCount;
int yDiffZeroCount, cbDiffZeroCount, crDiffZeroCount;
yDiffDwt = RdpegfxTileUtils.SubDiffingDwt(input.X, lastFrame.X, lenOfNonLL3Band, out yNewZeroCount, out yDiffZeroCount);
cbDiffDwt = RdpegfxTileUtils.SubDiffingDwt(input.Y, lastFrame.Y, lenOfNonLL3Band, out cbNewZeroCount, out cbDiffZeroCount);
crDiffDwt = RdpegfxTileUtils.SubDiffingDwt(input.Z, lastFrame.Z, lenOfNonLL3Band, out crNewZeroCount, out crDiffZeroCount);
// According to TD we should only compare the zeros in Luma (Y) component
// Need to be confirmed
if ((yDiffDwt != null && cbDiffDwt != null && crDiffDwt != null) && yNewZeroCount < yDiffZeroCount)
{
//use difference tile
output = new Triplet <short[]>(yDiffDwt, cbDiffDwt, crDiffDwt);
useDiffing = true;
}
else
{
// don't use difference tile
x = new short[input.X.Length];
Array.Copy(input.X, x, input.X.Length);
y = new short[input.Y.Length];
Array.Copy(input.Y, y, input.Y.Length);
z = new short[input.Z.Length];
Array.Copy(input.Z, z, input.Z.Length);
output = new Triplet <short[]>(x, y, z);
useDiffing = false;
}
}
}