/// <summary>
/// parse an PDS packet which contain palette info
/// </summary>
/// <param name="buffer">Buffer of raw byte data, 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>number of valid palette entries (-1 for fault)</returns>
private static PdsData ParsePds(byte[] buffer, SupSegment segment)
{
int paletteId = buffer[0]; // 8bit palette ID (0..7)
// 8bit palette version number (incremented for each palette change)
int paletteUpdate = buffer[1];
var p = new PaletteInfo();
p.PaletteSize = (segment.Size - 2) / 5;
if (p.PaletteSize <= 0)
{
return new PdsData {
Message = "Empty palette"
}
}
;
p.PaletteBuffer = new byte[p.PaletteSize * 5];
Buffer.BlockCopy(buffer, 2, p.PaletteBuffer, 0, p.PaletteSize * 5); // save palette buffer in palette object
return(new PdsData
{
Message = "PalId: " + paletteId + ", update: " + paletteUpdate + ", " + p.PaletteSize + " entries",
PaletteId = paletteId,
PaletteVersion = paletteUpdate,
PaletteInfo = p,
});
}
public static BluRaySupPalette DecodePalette(IList <PaletteInfo> paletteInfos)
{
BluRaySupPalette palette = new BluRaySupPalette(256);
// by definition, index 0xff is always completely transparent
// also all entries must be fully transparent after initialization
bool fadeOut = false;
for (int j = 0; j < paletteInfos.Count; j++)
{
PaletteInfo p = paletteInfos[j];
int index = 0;
for (int i = 0; i < p.PaletteSize; i++)
{
// each palette entry consists of 5 bytes
int palIndex = p.PaletteBuffer[index];
int y = p.PaletteBuffer[++index];
int cr = p.PaletteBuffer[++index];
int cb = p.PaletteBuffer[++index];
int alpha = p.PaletteBuffer[++index];
int alphaOld = palette.GetAlpha(palIndex);
// avoid fading out
if (alpha >= alphaOld)
{
if (alpha < AlphaCrop)
{// to not mess with scaling algorithms, make transparent color black
y = 16;
cr = 128;
cb = 128;
}
palette.SetAlpha(palIndex, alpha);
}
else
{
fadeOut = true;
}
palette.SetYCbCr(palIndex, y, cb, cr);
index++;
}
}
if (fadeOut)
{
System.Diagnostics.Debug.Print("fade out detected -> patched palette\n");
}
return(palette);
}
/// <summary>
/// Initializes a new instance of the <see cref="PaletteInfo"/> class.
/// </summary>
/// <param name="paletteInfo">
/// The palette info.
/// </param>
public PaletteInfo(PaletteInfo paletteInfo)
{
this.PaletteSize = paletteInfo.PaletteSize;
this.PaletteBuffer = new byte[paletteInfo.PaletteBuffer.Length];
Buffer.BlockCopy(paletteInfo.PaletteBuffer, 0, this.PaletteBuffer, 0, this.PaletteBuffer.Length);
}
/// <summary>
/// parse an PDS packet which contain palette info
/// </summary>
/// <param name="buffer">Buffer of raw byte data, starting right after segment</param>
/// <param name="segment">object containing info about the current segment</param>
/// <returns>number of valid palette entries (-1 for fault)</returns>
private static PdsData ParsePds(byte[] buffer, SupSegment segment)
{
int paletteId = buffer[0]; // 8bit palette ID (0..7)
// 8bit palette version number (incremented for each palette change)
int paletteUpdate = buffer[1];
var p = new PaletteInfo();
p.PaletteSize = (segment.Size - 2) / 5;
if (p.PaletteSize <= 0)
return new PdsData { Message = "Empty palette" };
p.PaletteBuffer = new byte[p.PaletteSize * 5];
Buffer.BlockCopy(buffer, 2, p.PaletteBuffer, 0, p.PaletteSize * 5); // save palette buffer in palette object
return new PdsData
{
Message = "PalId: " + paletteId + ", update: " + paletteUpdate + ", " + p.PaletteSize + " entries",
PaletteId = paletteId,
PaletteVersion = paletteUpdate,
PaletteInfo = p,
};
}
public PaletteInfo(PaletteInfo paletteInfo)
{
PaletteSize = paletteInfo.PaletteSize;
PaletteBuffer = new byte[paletteInfo.PaletteBuffer.Length];
Buffer.BlockCopy(paletteInfo.PaletteBuffer, 0, PaletteBuffer, 0, PaletteBuffer.Length);
}