private byte ReadByte(MPEGVersionFrameDescriptor frameHeader, int index)
{
int startPosition = frameHeader.StartIndex + frameHeader.HeaderSize + (index * PartNumber);
byte result = 0;
for (int i = 0; i < PartNumber; ++i)
{
result |= (byte)((this._fileData[startPosition + i] & 0x03) << ((PartNumber - i - 1) * 2));
}
return result;
}
private void WriteByte(MPEGVersionFrameDescriptor frameHeader, byte @byte, int index)
{
int startPosition = frameHeader.StartIndex + frameHeader.HeaderSize + (index * PartNumber);
for (int i = 0; i < PartNumber; ++i)
{
this._fileData[startPosition + i] = (byte)((this._fileData[startPosition + i] & 0xFC) | ((@byte >> ((PartNumber - i - 1) * 2)) & 0x3));
}
}
private bool TryGetNextFrame(int startIndex, out MPEGVersionFrameDescriptor frameDescriptor)
{
frameDescriptor = null;
var frameStartIndex = this.GetNextFrameStartPosition(startIndex);
bool result = frameStartIndex != -1;
if (result)
{
var header = new byte[FrameHeaderSize];
Array.Copy(this._fileData, frameStartIndex, header, 0, FrameHeaderSize);
frameDescriptor = this._frameDescriptorBuilder.Build(header);
frameDescriptor.StartIndex = frameStartIndex;
return true;
}
return false;
}