jellyfin-server/DvdLib/Ifo/ProgramChain.cs

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3.7 KiB
C#
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using System.Collections.Generic;
using System.IO;
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using System.Linq;
namespace DvdLib.Ifo
{
public enum ProgramPlaybackMode
{
Sequential,
Random,
Shuffle
}
public class ProgramChain
{
private byte _programCount;
public readonly List<Program> Programs;
private byte _cellCount;
public readonly List<Cell> Cells;
public DvdTime PlaybackTime { get; private set; }
public UserOperation ProhibitedUserOperations { get; private set; }
public byte[] AudioStreamControl { get; private set; } // 8*2 entries
public byte[] SubpictureStreamControl { get; private set; } // 32*4 entries
private ushort _nextProgramNumber;
private ushort _prevProgramNumber;
private ushort _goupProgramNumber;
public ProgramPlaybackMode PlaybackMode { get; private set; }
public uint ProgramCount { get; private set; }
public byte StillTime { get; private set; }
public byte[] Palette { get; private set; } // 16*4 entries
private ushort _commandTableOffset;
private ushort _programMapOffset;
private ushort _cellPlaybackOffset;
private ushort _cellPositionOffset;
public readonly uint VideoTitleSetIndex;
internal ProgramChain(uint vtsPgcNum)
{
VideoTitleSetIndex = vtsPgcNum;
Cells = new List<Cell>();
Programs = new List<Program>();
}
internal void ParseHeader(BinaryReader br)
{
long startPos = br.BaseStream.Position;
br.ReadUInt16();
_programCount = br.ReadByte();
_cellCount = br.ReadByte();
PlaybackTime = new DvdTime(br.ReadBytes(4));
ProhibitedUserOperations = (UserOperation)br.ReadUInt32();
AudioStreamControl = br.ReadBytes(16);
SubpictureStreamControl = br.ReadBytes(128);
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_nextProgramNumber = br.ReadUInt16();
_prevProgramNumber = br.ReadUInt16();
_goupProgramNumber = br.ReadUInt16();
StillTime = br.ReadByte();
byte pbMode = br.ReadByte();
if (pbMode == 0) PlaybackMode = ProgramPlaybackMode.Sequential;
else PlaybackMode = ((pbMode & 0x80) == 0) ? ProgramPlaybackMode.Random : ProgramPlaybackMode.Shuffle;
ProgramCount = (uint)(pbMode & 0x7F);
Palette = br.ReadBytes(64);
_commandTableOffset = br.ReadUInt16();
_programMapOffset = br.ReadUInt16();
_cellPlaybackOffset = br.ReadUInt16();
_cellPositionOffset = br.ReadUInt16();
// read position info
br.BaseStream.Seek(startPos + _cellPositionOffset, SeekOrigin.Begin);
for (int cellNum = 0; cellNum < _cellCount; cellNum++)
{
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var c = new Cell();
c.ParsePosition(br);
Cells.Add(c);
}
br.BaseStream.Seek(startPos + _cellPlaybackOffset, SeekOrigin.Begin);
for (int cellNum = 0; cellNum < _cellCount; cellNum++)
{
Cells[cellNum].ParsePlayback(br);
}
br.BaseStream.Seek(startPos + _programMapOffset, SeekOrigin.Begin);
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var cellNumbers = new List<int>();
for (int progNum = 0; progNum < _programCount; progNum++) cellNumbers.Add(br.ReadByte() - 1);
for (int i = 0; i < cellNumbers.Count; i++)
{
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int max = (i + 1 == cellNumbers.Count) ? _cellCount : cellNumbers[i + 1];
Programs.Add(new Program(Cells.Where((c, idx) => idx >= cellNumbers[i] && idx < max).ToList()));
}
}
}
}