public uint GetCtsOffset(uint sample)
{
uint sampleOffset = 0;
if (sample == 0)
{
throw new Exception("OUT_OF_RANGE");
}
uint entryIndex = 0;
uint num3 = 0;
if (sample >= this.lookupCache.sample)
{
entryIndex = this.lookupCache.entryIndex;
num3 = this.lookupCache.sample;
}
for (uint i = entryIndex; i < this.Entries.Count; i++)
{
Mp4CttsEntry entry = this.Entries[(int)i];
if (sample <= (num3 + entry.SampleCount))
{
sampleOffset = entry.SampleOffset;
this.lookupCache.entryIndex = i;
this.lookupCache.sample = num3;
return(sampleOffset);
}
num3 += entry.SampleCount;
}
throw new Exception("OUT_OF_RANGE");
}
public Mp4CttsBox(uint size, Mp4Stream stream) : base(size, Mp4BoxType.CTTS, 0L, stream)
{
this.lookupCache = new LookupCache();
uint num = stream.ReadUInt32();
this.Entries = new List <Mp4CttsEntry>((int)num);
byte[] buffer = new byte[num * 8];
stream.Read(buffer, (int)(num * 8));
bool flag = false;
int num2 = 0;
for (int i = 0; i < num; i++)
{
this.Entries.Add(new Mp4CttsEntry());
this.Entries[i].SampleCount = Mp4Util.BytesToUInt32BE(buffer, i * 8);
uint num4 = Mp4Util.BytesToUInt32BE(buffer, (i * 8) + 4);
if ((num4 & 0x80000000) != 0)
{
flag = true;
int num5 = (int)num4;
if (num5 < num2)
{
num2 = num5;
}
}
this.Entries[i].SampleOffset = num4;
}
if (flag)
{
for (int j = 0; j < num; j++)
{
Mp4CttsEntry local1 = this.Entries[j];
local1.SampleOffset -= (uint)num2;
}
}
}