/** Picture:
* @param b payload buffer
* @param d decoder of the picture
*
* The b buffer should only point to the payload data section of
* the picture (not the header). The only methods that would ever need
* to be called are parse(), decode(), and getImage(). However,
* one should check wether the error variable is set before and after
* calling a method. One should not call them in any other order than that
* just specified. Each can be called without arguments and should not be
* called twice. */
public Picture(Buffer b, Decoder d)
{
num = b.GetInt(13);
code = b.GetByte(4);
buf = b;
dec = d;
par = new Parameters(code);
coeffs = new SubBand[3][];
coeffs[0] = new SubBand[19];
coeffs[1] = new SubBand[19];
coeffs[2] = new SubBand[19];
motion_buffers = new Buffer[9];
status = Decoder.Status.NULL;
}
/* at this point, the buffer must be a complete dirac packet */
private void Dispatch(Buffer b)
{
if (b.GetInt(5) != b.Size())
throw new Exception("Incorrect buffer sizes");
byte c = b.GetByte(4);
switch(c) {
case 0x00:
VideoFormat tmp = new VideoFormat(b);
if(format == null) {
format = tmp;
status = Status.OK;
} else if(!tmp.Equals(format)) {
throw new Exception("Stream Error: Inequal Video Formats");
}
break;
case 0x10:
status = Status.DONE;
break;
case 0x20:
case 0x30:
break;
default:
if(format == null)
throw new Exception("Stream Error: Picture Before Header");
Picture pic = new Picture(b, this);
pic.Parse();
inQueue.Push(pic);
break;
}
}
