public virtual void SaveIndex()
{
if (BlockIndex == null || BlockIndex.Length == 0)
{
return;
}
MLVTypes.mlv_file_hdr_t fileHeader = ReadMainHeader();
MLVTypes.mlv_xref_hdr_t xrefHdr = new MLVTypes.mlv_xref_hdr_t();
/* update MLVI header */
fileHeader.blockSize = (uint)Marshal.SizeOf(fileHeader);
fileHeader.videoFrameCount = 0;
fileHeader.audioFrameCount = 0;
fileHeader.fileNum = (ushort)FileNames.Length;
/* create XREF block */
xrefHdr.blockType = "XREF";
xrefHdr.blockSize = (uint)(Marshal.SizeOf(xrefHdr) + BlockIndex.Length * Marshal.SizeOf(new MLVTypes.mlv_xref_t()));
xrefHdr.timestamp = 1;
xrefHdr.frameType = 3; /* video+audio */
xrefHdr.entryCount = (uint)BlockIndex.Length;
/* open file */
BinaryWriter writer = new BinaryWriter(new FileStream(IndexName, FileMode.Create, FileAccess.Write));
writer.Write(MLVTypes.ToByteArray(fileHeader));
writer.Write(MLVTypes.ToByteArray(xrefHdr));
foreach (var entry in BlockIndex)
{
MLVTypes.mlv_xref_t xrefEntry = new MLVTypes.mlv_xref_t();
xrefEntry.fileNumber = (ushort)entry.fileNumber;
xrefEntry.frameOffset = (ulong)entry.position;
xrefEntry.empty = 0;
switch (entry.type)
{
case "VIDF":
xrefEntry.frameType = 1;
break;
case "AUDF":
xrefEntry.frameType = 2;
break;
default:
xrefEntry.frameType = 0;
break;
}
writer.Write(MLVTypes.ToByteArray(xrefEntry));
}
writer.Close();
}
private void LoadIndex()
{
BinaryReader index = new BinaryReader(File.Open(IndexName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite));
/* read MLV block header */
byte[] mlvBlockBuf = ReadBlockData(index);
MLVTypes.mlv_file_hdr_t fileHeader = (MLVTypes.mlv_file_hdr_t)MLVTypes.ToStruct("MLVI", mlvBlockBuf);
MLVTypes.mlv_file_hdr_t mainHeader = ReadMainHeader();
if (mainHeader.fileGuid != fileHeader.fileGuid)
{
throw new Exception("GUID mismatch");
}
byte[] xrefBlockBuf = ReadBlockData(index);
MLVTypes.mlv_xref_hdr_t xrefHeader = (MLVTypes.mlv_xref_hdr_t)MLVTypes.ToStruct("XREF", xrefBlockBuf);
BlockIndex = new xrefEntry[xrefHeader.entryCount];
int entrySize = Marshal.SizeOf(new MLVTypes.mlv_xref_t());
for (int pos = 0; pos < xrefHeader.entryCount; pos++)
{
MLVTypes.mlv_xref_t xrefEntry = (MLVTypes.mlv_xref_t)MLVTypes.ToStruct("XREF_ENTRY", xrefBlockBuf, Marshal.SizeOf(xrefHeader) + pos * entrySize);
BlockIndex[pos] = new xrefEntry();
BlockIndex[pos].fileNumber = xrefEntry.fileNumber;
BlockIndex[pos].position = (long)xrefEntry.frameOffset;
BlockIndex[pos].size = 0;
switch (xrefEntry.frameType)
{
case 0:
BlockIndex[pos].type = "";
break;
case 1:
BlockIndex[pos].type = "VIDF";
break;
case 2:
BlockIndex[pos].type = "AUDF";
break;
}
}
}
