public static DcCategoryEncodedPair CalculateDifferenceDc(ColorChannel channel, int i)
{
int result = (int)channel.GetBlock(i)[0, 0];
if (i != 0)
{
result = (int)channel.GetBlock(i)[0, 0] - (int)channel.GetBlock(i - 1)[0, 0];
}
return(new DcCategoryEncodedPair(AbstractCategoryEncodedPair.CalculateCategory(result),
AbstractCategoryEncodedPair.EncodeCategory(result)));
}
private void QuantizeChannel(ColorChannel channel, DoubleMatrix quantizationTable)
{
for (int i = 0; i < channel.GetNumOfBlocks(); i++)
{
CosineTransformation.Quantize(channel.GetBlock(i), quantizationTable);
}
}
private CountdownEvent TransformChannel(ColorChannel channel)
{
CountdownEvent e = new CountdownEvent(1);
int blockCount = channel.GetNumOfBlocks();
if (blockCount < 500 >> 4)
{
for (int i = 0; i < channel.GetNumOfBlocks(); i++)
{
Arai.Calc(channel.GetBlock(i));
}
}
else
{
int threadCount = 8;
if (blockCount < 1000 >> 4)
{
threadCount = 4;
}
for (int i = 0; i < blockCount; i += blockCount / threadCount)
{
e.AddCount();
ThreadPool.QueueUserWorkItem(
state =>
{
object[] inp = state as object[];
//Console.WriteLine($"Thread with block {(int) inp[0]} to block {(int) inp[1]} started...");
int upper = (int)inp[1];
for (int j = (int)inp[0]; j < upper; j++)
{
Arai.Calc(channel.GetBlock(j));
}
e.Signal();
}, new object[] { i, i + (blockCount / threadCount) });
}
}
e.Signal();
return(e);
}
public static List <AcCategoryEncodedPair> GetAllACs(ColorChannel channel)
{
List <AcCategoryEncodedPair> result = new List <AcCategoryEncodedPair>();
for (int i = 0; i < channel.GetNumOfBlocks(); i++)
{
DoubleMatrix block = channel.GetBlock(i);
List <AcRunlengthEncodedPair> runLengthEncodedBlock = EncodeRunlength(Util.ZigzagSort(block));
List <AcCategoryEncodedPair> categoryEncodedBlock = EncodeCategoriesAc(runLengthEncodedBlock);
result.AddRange(categoryEncodedBlock);
}
return(result);
}
private void WriteAcDcEncodedBlock(ColorChannel channel, int xOfChannel, int yOfChannel,
Dictionary <int, CodeWord> dcCodeBook,
Dictionary <int, CodeWord> acCodeBook)
{
DcCategoryEncodedPair dc = AcDcEncoder.CalculateDifferenceDc(channel,
channel
.GetPlainIndexOfBlock(
xOfChannel,
yOfChannel));
List <AcRunlengthEncodedPair> acRunLengthEncodedPairs =
AcDcEncoder.EncodeRunlength(Util.ZigzagSort(channel.GetBlock(xOfChannel,
yOfChannel)));
List <AcCategoryEncodedPair> acCategoryEncodedPairs = AcDcEncoder.EncodeCategoriesAc(
acRunLengthEncodedPairs);
AcDcEncoder.WriteDcCoefficient(BitStream, dc, dcCodeBook);
AcDcEncoder.WriteAcCoefficients(BitStream, acCategoryEncodedPairs, acCodeBook);
}