/// <summary>
/// Parse the VDX to locate individual chunks
/// </summary>
private void parseROQ()
{
long stop = 0;
// Final stream position
/*if (rlData.HasValue)
{
stop = rlData.Value.offset + rlData.Value.length;
}
else
{
stop = file.BaseStream.Length;
}*/
//ROQHeader header = new VDXHeader();
ROQChunkHeader chunk = new ROQChunkHeader();
// Initialise queue's
audioOffsets = new Queue<long>();
//videoOffsets = new Queue<long>();
// Read VDX header
//header.ID = file.ReadUInt16();
//if (header.ID != 0x9267)
// throw new Exception("Invalid VDX header");
//header.Unknown1 = file.ReadByte();
//header.Unknown2 = file.ReadByte();
//header.Unknown3 = file.ReadByte();
//header.Unknown4 = file.ReadByte();
//header.FPS = file.ReadUInt16();
//fps = (byte)header.FPS;
try
{
chunk = readChunkHeader();
if (chunk.BlockType != ROQBlockType.FileStart)
throw new Exception("Bad file type");
while (file.BaseStream.Position < file.BaseStream.Length)
{
// Read VDX chunk header
chunk = readChunkHeader();
// Add offsets where appropriate
switch (chunk.BlockType)
{
case ROQBlockType.Mono:
case ROQBlockType.Stereo:
audioOffsets.Enqueue(file.BaseStream.Position - VDXChunkHeader.size);
break;
case ROQBlockType.AudioContainer:
break;
//case VDXBlockType.Video:
// videoFrames++;
// goto case VDXBlockType.Zero;
//case VDXBlockType.Zero:
// videoMaster.Enqueue(file.BaseStream.Position - VDXChunkHeader.size);
// break;
//case VDXBlockType.Sound:
// audioOffsets.Enqueue(file.BaseStream.Position - VDXChunkHeader.size);
// break;
case ROQBlockType.Image:
//if (imageOffset == 0)
imageOffset.Add(file.BaseStream.Position - ROQChunkHeader.size);
break;
case ROQBlockType.ImageInfo:
//System.Diagnostics.Debug.WriteLine("Img Info - size: " + file.ReadUInt16() + "x" + file.ReadUInt16());
break;
}
// Seek to next chunk
if (chunk.BlockType != ROQBlockType.AudioContainer)
file.BaseStream.Seek(chunk.DataSize, System.IO.SeekOrigin.Current);
}
} catch {
audio = null;
//videoFrames = 1;
}
}
/// <summary>
/// Read in the header for the current chunk
/// </summary>
/// <returns>Chunk header structure</returns>
private ROQChunkHeader readChunkHeader()
{
ROQChunkHeader chunk = new ROQChunkHeader();
chunk.BlockType = (ROQBlockType)file.ReadByte();
chunk.Identifier = file.ReadByte();
chunk.DataSize = file.ReadUInt32();
chunk.BlockParameter = file.ReadUInt16();
return chunk;
}
