public bool ContainsKey(string key)
{
if (this is JsonObjectCollection JOC)
{
return(JOC.ContainsKey(key));
}
else
{
return(false);
}
}
/// <summary>
/// Tries to decode an EMDF block, returns if succeeded.
/// </summary>
/// <remarks>Assumes the sync word was already read.</remarks>
bool DecodeBlock(BitExtractor extractor)
{
int length = extractor.Read(16);
int frameEndPos = extractor.Position + length * 8;
if (frameEndPos > extractor.BackPosition)
{
return(false);
}
int version = extractor.Read(2);
if (version == 3)
{
version += extractor.VariableBits(2);
}
int key = extractor.Read(3);
if (key == 7)
{
key += extractor.VariableBits(3);
}
if (version != 0 || key != 0)
{
return(false);
}
int payloadID;
while (extractor.Position < frameEndPos && (payloadID = extractor.Read(5)) != 0)
{
if (payloadID == 0x1F)
{
payloadID += extractor.VariableBits(5);
}
if (payloadID > jocPayloadID)
{
return(false);
}
bool hasSampleOffset;
int sampleOffset = 0;
if (hasSampleOffset = extractor.ReadBit())
{
sampleOffset = extractor.Read(12) >> 1; // Skip 1 bit
}
if (extractor.ReadBit())
{
extractor.VariableBits(11);
}
if (extractor.ReadBit())
{
extractor.VariableBits(2);
}
if (extractor.ReadBit())
{
extractor.Skip(8);
}
if (!extractor.ReadBit())
{
bool frameAligned = false;
if (!hasSampleOffset)
{
frameAligned = extractor.ReadBit();
if (frameAligned)
{
extractor.Skip(2);
}
}
if (hasSampleOffset || frameAligned)
{
extractor.Skip(7);
}
}
int payloadEnd = extractor.VariableBits(8) * 8 + extractor.Position;
if (payloadEnd > extractor.BackPosition)
{
return(false);
}
if (payloadID == jocPayloadID)
{
JOC.Decode(extractor);
HasObjects = true;
}
else if (payloadID == oamdPayloadID)
{
OAMD.Decode(extractor, sampleOffset);
}
extractor.Position = payloadEnd;
}
return(true);
}
