/// <summary>
/// Checks if two SubPicture object can be merged because the time gap between them is rather small
/// and the embedded objects seem to be identical
/// </summary>
/// <param name="a">first SubPicture object (earlier)</param>
/// <param name="b">2nd SubPicture object (later)</param>
/// <returns>return true if the SubPictures can be merged</returns>
private static bool IsPictureMergable(BluRaySupPicture a, BluRaySupPicture b)
{
bool eq = false;
if (a != null && b != null)
{
if (a.EndTime == 0 || b.StartTime - a.EndTime < Core.GetMergePtSdiff())
{
ImageObject ao = a.ObjectIdImage;
ImageObject bo = b.ObjectIdImage;
if (ao != null && bo != null)
{
if (ao.BufferSize == bo.BufferSize && ao.Width == bo.Width && ao.Height == bo.Height)
{
eq = true;
}
}
}
}
return(eq);
}
/// <summary>
/// parse an ODS packet which contain the image data
/// </summary>
/// <param name="buffer">raw byte date, starting right after segment</param>
/// <param name="segment">object containing info about the current segment</param>
/// <param name="pic">SubPicture object containing info about the current caption</param>
/// <param name="msg">reference to message string</param>
/// <returns>true if this is a valid new object (neither invalid nor a fragment)</returns>
private static bool ParseOds(byte[] buffer, SupSegment segment, BluRaySupPicture pic, string[] msg)
{
ImageObjectFragment info;
int objId = BigEndianInt16(buffer, 0); // 16bit object_id
int objVer = buffer[2]; // 16bit object_id nikse - index 2 or 1???
int objSeq = buffer[3]; // 8bit first_in_sequence (0x80),
// last_in_sequence (0x40), 6bits reserved
bool first = (objSeq & 0x80) == 0x80;
bool last = (objSeq & 0x40) == 0x40;
if (pic.ImageObjects == null)
{
pic.ImageObjects = new List <ImageObject>();
}
ImageObject imgObj;
if (objId >= pic.ImageObjects.Count)
{
imgObj = new ImageObject();
pic.ImageObjects.Add(imgObj);
}
else
{
imgObj = pic.GetImageObject(objId);
}
if (imgObj.Fragments == null || first)
{ // 8bit object_version_number
// skipped:
// 24bit object_data_length - full RLE buffer length (including 4 bytes size info)
int width = BigEndianInt16(buffer, 7); // object_width
int height = BigEndianInt16(buffer, 9); // object_height
if (width <= pic.Width && height <= pic.Height)
{
imgObj.Fragments = new List <ImageObjectFragment>();
info = new ImageObjectFragment();
info.ImagePacketSize = segment.Size - 11; // Image packet size (image bytes)
info.ImageBuffer = new byte[info.ImagePacketSize];
Buffer.BlockCopy(buffer, 11, info.ImageBuffer, 0, info.ImagePacketSize);
imgObj.Fragments.Add(info);
imgObj.BufferSize = info.ImagePacketSize;
imgObj.Height = height;
imgObj.Width = width;
msg[0] = "ID: " + objId + ", update: " + objVer + ", seq: " + (first ? "first" : "") +
((first && last) ? "/" : "") + (last ? "" + "last" : "");
return(true);
}
System.Diagnostics.Debug.Print("Invalid image size - ignored");
return(false);
}
// object_data_fragment
// skipped:
// 16bit object_id
// 8bit object_version_number
// 8bit first_in_sequence (0x80), last_in_sequence (0x40), 6bits reserved
info = new ImageObjectFragment();
info.ImagePacketSize = segment.Size - 4;
info.ImageBuffer = new byte[info.ImagePacketSize];
Buffer.BlockCopy(buffer, 4, info.ImageBuffer, 0, info.ImagePacketSize);
imgObj.Fragments.Add(info);
imgObj.BufferSize += info.ImagePacketSize; // total size (may contain several packets)
msg[0] = "ID: " + objId + ", update: " + objVer + ", seq: " + (first ? "first" : "") + ((first && last) ? "/" : "") + (last ? "" + "last" : "");
return(false);
}