public static IEnumerable <ChapterInfo> GetStreams(string ifoFile)
{
var pgcCount = IfoParser.GetPGCnb(ifoFile);
for (var i = 1; i <= pgcCount; i++)
{
yield return(GetChapterInfo(ifoFile, i));
}
}
private static List <Chapter> GetChapters(string ifoFile, int programChain, out IfoTimeSpan duration, out decimal fps)
{
var chapters = new List <Chapter>();
duration = IfoTimeSpan.Zero;
fps = 0;
var stream = new FileStream(ifoFile, FileMode.Open, FileAccess.Read, FileShare.Read);
var pcgItPosition = stream.GetPCGIP_Position();
var programChainPrograms = -1;
var programTime = TimeSpan.Zero;
decimal fpsLocal;
if (programChain >= 0)
{
var chainOffset = stream.GetChainOffset(pcgItPosition, programChain);
programTime = stream.ReadTimeSpan(pcgItPosition, chainOffset, out fpsLocal) ?? TimeSpan.Zero;
programChainPrograms = stream.GetNumberOfPrograms(pcgItPosition, chainOffset);
}
else
{
var programChains = stream.GetProgramChains(pcgItPosition);
for (var curChain = 1; curChain <= programChains; curChain++)
{
var chainOffset = stream.GetChainOffset(pcgItPosition, curChain);
var time = stream.ReadTimeSpan(pcgItPosition, chainOffset, out fpsLocal);
if (time == null)
{
break;
}
if (time.Value <= programTime)
{
continue;
}
programChain = curChain;
programChainPrograms = stream.GetNumberOfPrograms(pcgItPosition, chainOffset);
programTime = time.Value;
}
}
if (programChain < 0)
{
return(null);
}
chapters.Add(new Chapter {
Name = "Chapter 01", Time = TimeSpan.Zero
});
var longestChainOffset = stream.GetChainOffset(pcgItPosition, programChain);
int programMapOffset = IfoParser.ToInt16(stream.GetFileBlock((pcgItPosition + longestChainOffset) + 230, 2));
int cellTableOffset = IfoParser.ToInt16(stream.GetFileBlock((pcgItPosition + longestChainOffset) + 0xE8, 2));
for (var currentProgram = 0; currentProgram < programChainPrograms; ++currentProgram)
{
int entryCell = stream.GetFileBlock(((pcgItPosition + longestChainOffset) + programMapOffset) + currentProgram, 1)[0];
var exitCell = entryCell;
if (currentProgram < (programChainPrograms - 1))
{
exitCell = stream.GetFileBlock(((pcgItPosition + longestChainOffset) + programMapOffset) + (currentProgram + 1), 1)[0] - 1;
}
var totalTime = IfoTimeSpan.Zero;
for (var currentCell = entryCell; currentCell <= exitCell; currentCell++)
{
var cellStart = cellTableOffset + ((currentCell - 1) * 0x18);
var bytes = stream.GetFileBlock((pcgItPosition + longestChainOffset) + cellStart, 4);
var cellType = bytes[0] >> 6;
if (cellType == 0x00 || cellType == 0x01)
{
bytes = stream.GetFileBlock(((pcgItPosition + longestChainOffset) + cellStart) + 4, 4);
var ret = IfoParser.ReadTimeSpan(bytes, out fps) ?? IfoTimeSpan.Zero;
totalTime.IsNTSC = ret.IsNTSC;
totalTime += ret;
}
}
duration.IsNTSC = totalTime.IsNTSC;
duration += totalTime;
if (currentProgram + 1 < programChainPrograms)
{
chapters.Add(new Chapter {
Name = $"Chapter {currentProgram + 2:D2}", Time = duration
});
}
}
stream.Dispose();
return(chapters);
}