private AstroDigitalVideoStream(string fileName)
{
m_FileName = fileName;
m_AdvFile = AdvFile.OpenFile(fileName);
m_ImageSection = m_AdvFile.ImageSection;
CheckAdvFileFormatInternal();
}
public static AdvFile OpenFile(string fileName)
{
FileStream inputFile = new FileStream(fileName, FileMode.Open, FileAccess.Read);
BinaryReader fileReader = new BinaryReader(inputFile);
uint magic = fileReader.ReadUInt32();
if (magic != 0x46545346)
throw new FormatException("Unknown or unsupported version of an FSTF file");
byte dataFormatVer = fileReader.ReadByte();
uint numFrames = fileReader.ReadUInt32();
long indexTableOffset = fileReader.ReadInt64();
long metadataSystemTableOffset = fileReader.ReadInt64();
long metadataUserTableOffset = fileReader.ReadInt64();
AdvFile rv = new AdvFile();
rv.m_InputFile = inputFile;
rv.m_FileReader = fileReader;
rv.m_FileName = fileName;
if (dataFormatVer >= 1)
{
byte sectionsCount = fileReader.ReadByte();
var sectionDefs = new Dictionary<ulong, string>();
for (int i = 0; i < sectionsCount; i++)
{
string sectionType = fileReader.ReadAsciiString256();
ulong sectionHeaderOffset = fileReader.ReadUInt64();
sectionDefs.Add(sectionHeaderOffset, sectionType);
}
rv.m_NumberOfFrames = numFrames;
foreach (uint offset in sectionDefs.Keys)
{
inputFile.Seek(offset, SeekOrigin.Begin);
IAdvDataSection section = AdvSectionFactory.ConstructSection(sectionDefs[offset], fileReader);
rv.AddDataSection(section);
}
fileReader.BaseStream.Seek(metadataSystemTableOffset, SeekOrigin.Begin);
#region read metadata
uint propsCount = fileReader.ReadUInt32();
for (int i = 0; i < propsCount; i++)
{
string propName = fileReader.ReadAsciiString256();
string propValue = fileReader.ReadAsciiString256();
rv.AdvFileTags[propName] = propValue;
}
#endregion
rv.m_RecoveryOffset = fileReader.BaseStream.Position;
if (indexTableOffset > fileReader.BaseStream.Length || metadataUserTableOffset > fileReader.BaseStream.Length ||
indexTableOffset == 0 || metadataUserTableOffset == 0)
{
rv.m_IsCorrupted = true;
return rv;
}
inputFile.Seek(indexTableOffset, SeekOrigin.Begin);
}
rv.m_Magic = magic;
try
{
rv.m_Index = new AdvFramesIndex(fileReader);
}
catch (Exception ex)
{
Trace.WriteLine(ex);
rv.m_IsCorrupted = true;
return rv;
}
rv.InitialisePropertiesFromTags();
return rv;
}