static void Log(BinaryReader reader, QuantTable quantTable)
{
Logger.WriteLine("Table ID: " + quantTable.id);
Logger.WriteLine("Precision: " + quantTable.precision);
Logger.WriteLine("The table itself");
Common.PrintTable(quantTable.table, 8, 8, 4);
Logger.WriteLine();
}
public static int ReadTable(BinaryReader reader, ImgInfo imgInfo)
{
byte tableInfo = reader.ReadByte();
byte tableId = (byte)(tableInfo & 0xf); // Low 4 bits of tableInfo
if (tableId > 3)
{
throw new Exception("Invalid ID for quantization table");
}
var quantTable = new QuantTable
{
id = tableId,
precision = (byte)(tableInfo >> 4), // High 4 bits of tableInfo
valid = true,
table = new ushort[64]
};
int sizeOfElement = quantTable.precision == 0 ? 1 : 2;
var tabla = FileOps.tablasZigzag[8];
// Quantizer tables are in zigzag too!
if (quantTable.precision == 0)
{
for (int i = 0; i < 64; i++)
{
quantTable.table[tabla[i].Y * 8 + tabla[i].X] = reader.ReadByte();
}
}
else
{
for (int i = 0; i < 64; i++)
{
quantTable.table[tabla[i].Y * 8 + tabla[i].X] = reader.ReadBEUInt16();
}
}
imgInfo.quantTables[tableId] = quantTable;
//Log(reader, quantTable);
return(1 + 64 * sizeOfElement);
}
public static int ReadTable(BinaryReader reader, ImgInfo imgInfo)
{
byte tableInfo = reader.ReadByte();
byte tableId = (byte)(tableInfo & 0xf); // Low 4 bits of tableInfo
if (tableId > 3)
throw new Exception("Invalid ID for quantization table");
var quantTable = new QuantTable();
quantTable.id = tableId;
quantTable.precision = (byte)(tableInfo >> 4); // High 4 bits of tableInfo
quantTable.valid = true;
quantTable.table = new ushort[64];
int sizeOfElement = quantTable.precision == 0 ? 1: 2;
var tabla = FileOps.tablasZigzag[8];
// Quantizer tables are in zigzag too!
if (quantTable.precision == 0)
{
for (int i = 0; i < 64; i++)
{
quantTable.table[tabla[i].Y * 8 + tabla[i].X] = reader.ReadByte();
}
}
else
{
for (int i = 0; i < 64; i++)
{
quantTable.table[tabla[i].Y * 8 + tabla[i].X] = reader.ReadBEUInt16();
}
}
imgInfo.quantTables[tableId] = quantTable;
Log(reader, quantTable);
return 1 + 64 * sizeOfElement;
}
