public void Parse(IMpeg2VideoReader reader, IResultNodeState resultState)
{
resultState.Name = Name;
ScalableMode scalableMode = (ScalableMode)reader.GetBits(2, Attribute.ScalableMode, _scalableModeResultFormatter);
reader.State.Sequence.ScalableMode = scalableMode;
reader.GetBits(4, Attribute.LayerID);
if (scalableMode == ScalableMode.SpatialScalability)
{
reader.GetBits(14, Attribute.LowerLayerPredictionHorizontalSize);
reader.GetMarker();
reader.GetBits(14, Attribute.LowerLayerPredictionVerticalSize);
reader.GetBits(5, Attribute.HorizontalSubsamplingFactorM);
reader.GetBits(5, Attribute.HorizontalSubsamplingFactorN);
reader.GetBits(5, Attribute.VerticalSubsamplingFactorM);
reader.GetBits(5, Attribute.VerticalSubsamplingFactorN);
}
if (scalableMode == ScalableMode.TemporalScalability)
{
if (reader.GetFlag(Attribute.PictureMuxEnable))
{
reader.GetFlag(Attribute.MuxToProgressiveSequence);
}
reader.GetBits(3, Attribute.PictureMuxOrder);
reader.GetBits(3, Attribute.PictureMuxFactor);
}
}
public int Load(byte[] buffer, int startIndex, int bufferLength)
{
// If less than 10 bytes are available for processing then the header and following start code
// can't be read.
if ((bufferLength - startIndex) < 10)
{
return(0);
}
int index = startIndex + 4;
extensionStartCodeIdentifier = buffer[index] >> 4;
scalableMode = (ScalableMode)((buffer[index++] & 0xC0) >> 2);
layerId = (Read16(buffer, index++) & 0x03C0) >> 6;
if (scalableMode == ScalableMode.SpatialScalability)
{
if ((bufferLength - startIndex) < 15)
{
return(0);
}
lowerLayerPredictionHorizontalSize = Read16(buffer, index += 2) & 0x3FFF;
lowerLayerPredictionVerticalSize = (Read16(buffer, index++) & 0x7FFE) >> 1;
horizontalSubsamplingFactorM = (Read16(buffer, index++) & 0x01F0) >> 4;
horizontalSubsamplingFactorN = (Read16(buffer, index++) & 0x0F80) >> 7;
verticalSubsamplingFactorM = (buffer[index] & 0x7C) >> 6;
verticalSubsamplingFactorN = (Read16(buffer, index) & 0x03E0) >> 5;
}
if (scalableMode == ScalableMode.TemporalScalability)
{
pictureMuxEnable = (buffer[index] & 0x20) >> 5;
if (pictureMuxEnable == 1)
{
muxToProgressiveSequence = (buffer[index] & 0x10) >> 4;
pictureMuxOrder = (buffer[index] & 0x0E) >> 1;
pictureMuxFactor = (Read16(buffer, index) & 0x01C0) >> 6;
}
else
{
pictureMuxOrder = (buffer[index] & 0x1C) >> 2;
pictureMuxFactor = (Read16(buffer, index) & 0x0380) >> 7;
}
}
index++;
while (index < (bufferLength - 4))
{
if ((Read32(buffer, index) >> 8) == 1)
{
return(index - startIndex);
}
index++;
}
return(0);
}
