/// <summary>
/// Like ConvertJpegDataToMJpegByteArray but with an index at the end
/// </summary>
/// <returns></returns>
public byte[] MakeBuffer(bool writeindex)
{
byte[] buffer = null;
try
{
//sort by time, ascending
_jpegDataIndex.Sort(new IndexEntryComparer());
FramePacketIndex index = new FramePacketIndex();
using (MemoryStream memoryStream = new MemoryStream())
using (BinaryWriter binaryWriter = new BinaryWriter(memoryStream))
{
foreach (KeyValuePair <DateTime, byte[]> kvp in _jpegDataIndex)
{
///debug
_countExported++;
index.Add(kvp.Key, (int)memoryStream.Position);
if (kvp.Value != null)
{
binaryWriter.Write(
Encoding.ASCII.GetBytes(
string.Format(DatabaseFramePacketWrapper.FrameHeaderFormat, kvp.Value.Length, kvp.Key)));
binaryWriter.Write(kvp.Value);
}
//memoryStream.WriteTo(binaryWriter.BaseStream);
}
if (writeindex)
{
byte[] indexbytes = index.ToBytes();
binaryWriter.Seek(0, SeekOrigin.End);
binaryWriter.Write(Encoding.ASCII.GetBytes("--videoboundary--"));
int indexPosition = (int)(binaryWriter.BaseStream.Position);
binaryWriter.Write(indexbytes);
binaryWriter.Write(BitConverter.GetBytes(indexPosition));
}
buffer = memoryStream.ToArray();
}
}
catch (Exception ee)
{
Console.WriteLine(ee);
}
return(buffer);
}
public static FramePacketIndex MakeDummyIndex(DateTime start, int numFrames, int fps)
{
FramePacketIndex ind = new FramePacketIndex();
double interframedelay = 1000d / (double)fps;
for (int i = 0; i < numFrames; i++)
{
ind.Add(start.AddMilliseconds(i * fps), i);
}
return(ind);
}
public static FramePacketIndex GetIndexFromBytes(byte[] bytes, int start, int indexlen)
{
int entrylength = 8 /* sizeof DateTime */ + sizeof(int);
FramePacketIndex index = new FramePacketIndex();
for (int pos = start; pos < bytes.Length && pos < indexlen + start; pos += entrylength)
{
if (pos + entrylength > bytes.Length)
{
break;
}
DateTime dt = DateTime.FromBinary(BitConverter.ToInt64(bytes, pos));
int x = BitConverter.ToInt32(bytes, pos + 8);
index.Add(dt, x);
}
return(index);
}