public Trak(FileStream fs, ulong maximumLength)
{
Position = (ulong)fs.Position;
while (fs.Position < (long)maximumLength)
{
if (!InitializeSizeAndName(fs))
{
return;
}
if (Name == "mdia")
{
Mdia = new Mdia(fs, Position);
}
else if (Name == "tkhd")
{
Tkhd = new Tkhd(fs);
}
fs.Seek((long)Position, SeekOrigin.Begin);
}
}
public Minf(FileStream fs, ulong maximumLength, UInt32 timeScale, string handlerType, Mdia mdia)
{
Position = (ulong)fs.Position;
while (fs.Position < (long)maximumLength)
{
if (!InitializeSizeAndName(fs))
{
return;
}
if (Name == "stbl")
{
Stbl = new Stbl(fs, Position, timeScale, handlerType, mdia);
}
fs.Seek((long)Position, SeekOrigin.Begin);
}
}
public Stbl(FileStream fs, ulong maximumLength, uint timeScale, string handlerType, Mdia mdia)
{
_mdia = mdia;
Position = (ulong)fs.Position;
while (fs.Position < (long)maximumLength)
{
if (!InitializeSizeAndName(fs))
{
return;
}
if (Name == "stco") // 32-bit - chunk offset
{
Buffer = new byte[Size - 4];
fs.Read(Buffer, 0, Buffer.Length);
int version = Buffer[0];
uint totalEntries = GetUInt(4);
uint lastOffset = 0;
for (int i = 0; i < totalEntries; i++)
{
uint offset = GetUInt(8 + i * 4);
if (lastOffset + 5 < offset)
{
ReadText(fs, offset, handlerType);
}
lastOffset = offset;
}
}
else if (Name == "co64") // 64-bit
{
Buffer = new byte[Size - 4];
fs.Read(Buffer, 0, Buffer.Length);
int version = Buffer[0];
uint totalEntries = GetUInt(4);
ulong lastOffset = 0;
for (int i = 0; i < totalEntries; i++)
{
ulong offset = GetUInt64(8 + i * 8);
if (lastOffset + 8 < offset)
{
ReadText(fs, offset, handlerType);
}
lastOffset = offset;
}
}
else if (Name == "stsz") // sample sizes
{
Buffer = new byte[Size - 4];
fs.Read(Buffer, 0, Buffer.Length);
int version = Buffer[0];
uint uniformSizeOfEachSample = GetUInt(4);
uint numberOfSampleSizes = GetUInt(8);
StszSampleCount = numberOfSampleSizes;
for (int i = 0; i < numberOfSampleSizes; i++)
{
if (12 + i * 4 + 4 < Buffer.Length)
{
uint sampleSize = GetUInt(12 + i * 4);
}
}
}
else if (Name == "stts") // sample table time to sample map
{
//https://developer.apple.com/library/mac/#documentation/QuickTime/QTFF/QTFFChap2/qtff2.html#//apple_ref/doc/uid/TP40000939-CH204-SW1
Buffer = new byte[Size - 4];
fs.Read(Buffer, 0, Buffer.Length);
int version = Buffer[0];
uint numberOfSampleTimes = GetUInt(4);
double totalTime = 0;
if (_mdia.IsClosedCaption)
{
for (int i = 0; i < numberOfSampleTimes; i++)
{
uint sampleCount = GetUInt(8 + i * 8);
uint sampleDelta = GetUInt(12 + i * 8);
for (int j = 0; j < sampleCount; j++)
{
totalTime += sampleDelta / (double)timeScale;
if (StartTimeCodes.Count > 0)
{
EndTimeCodes[EndTimeCodes.Count - 1] = totalTime - 0.001;
}
StartTimeCodes.Add(totalTime);
EndTimeCodes.Add(totalTime + 2.5);
}
}
}
else
{
for (int i = 0; i < numberOfSampleTimes; i++)
{
uint sampleCount = GetUInt(8 + i * 8);
uint sampleDelta = GetUInt(12 + i * 8);
totalTime += sampleDelta / (double)timeScale;
if (StartTimeCodes.Count <= EndTimeCodes.Count)
{
StartTimeCodes.Add(totalTime);
}
else
{
EndTimeCodes.Add(totalTime);
}
}
}
}
else if (Name == "stsc") // sample table sample to chunk map
{
Buffer = new byte[Size - 4];
fs.Read(Buffer, 0, Buffer.Length);
int version = Buffer[0];
uint numberOfSampleTimes = GetUInt(4);
for (int i = 0; i < numberOfSampleTimes; i++)
{
if (16 + i * 12 + 4 < Buffer.Length)
{
uint firstChunk = GetUInt(8 + i * 12);
uint samplesPerChunk = GetUInt(12 + i * 12);
uint sampleDescriptionIndex = GetUInt(16 + i * 12);
}
}
}
fs.Seek((long)Position, SeekOrigin.Begin);
}
}