private void ReadHeader()
{
uint code = 0;
uint startCode = 0;
AlignStreamData();
code = ReadStreamData(22);
startCode = (uint)(code & ~0x1F);
if (startCode == 32)
{
if (((code & 0x1F) == 0x1F))
{
if (ImageSlice == null)
{
ImageSlice = new ImageSlice(BlockCount);
PixelData = new ushort[Width * Height];
InternalImageSource = new WriteableBitmap(Width, Height, 96, 96, PixelFormats.Bgr565, null);
Rectangle = new Int32Rect(0, 0, Width, Height);
}
PictureComplete = true;
}
else
{
if (SliceIndex++ == 0)
{
PictureFormat = (int)ReadStreamData(2);
Resolution = (int)ReadStreamData(3);
PictureType = (int)ReadStreamData(3);
QuantizerMode = (int)ReadStreamData(5);
FrameIndex = (int)ReadStreamData(32);
switch (PictureFormat)
{
case 1: //(int)PictureFormats.Cif:
Width = CONST_WidthCif << Resolution - 1;
Height = CONST_HeightCif << Resolution - 1;
break;
case 2: //(int)PictureFormats.Vga:
Width = CONST_WidthVga << Resolution - 1;
Height = CONST_HeightVga << Resolution - 1;
break;
}
//We assume two bytes per pixel (RGB 565)
PixelRowSize = Width << 1;
SliceCount = Height >> 4;
BlockCount = Width >> 4;
if (ImageSlice == null)
{
ImageSlice = new ImageSlice(BlockCount);
PixelData = new ushort[Width * Height];
InternalImageSource = new WriteableBitmap(Width, Height, 96, 96, PixelFormats.Bgr565, null);
Rectangle = new Int32Rect(0, 0, Width, Height);
}
else
{
if (ImageSlice.MacroBlocks.Count != BlockCount)
{
ImageSlice = new ImageSlice(BlockCount);
PixelData = new ushort[Width * Height];
InternalImageSource = new WriteableBitmap(Width, Height, 96, 96, PixelFormats.Bgr565, null);
Rectangle = new Int32Rect(0, 0, Width, Height);
}
}
}
else
{
QuantizerMode = (int)ReadStreamData(5);
}
}
}
}
public VideoImage()
{
ImageStreams = new Stack<byte[]>();
Width = CONST_WidthVga << Resolution - 1;
Height = CONST_HeightVga << Resolution - 1;
BlockCount = Width >> 4;
ImageSlice = new ImageSlice(BlockCount);
PixelData = new ushort[Width * Height];
InternalImageSource = new WriteableBitmap(Width, Height, 96, 96, PixelFormats.Bgr565, null);
Rectangle = new Int32Rect(0, 0, Width, Height);
}
