public long SendPartOfFile(string path, long offset, int length, string target, ushort port)
{
// Make sure that user is allowed to access the server
ServerRuntime.TestWebAccess();
// Validate path
if (string.IsNullOrEmpty(path))
{
throw new ArgumentNullException("path");
}
if (!path.ToLower().EndsWith(".ts"))
{
throw new ArgumentException(path, "path");
}
// Check against VCR.NET recording directories
if (!VCRConfiguration.Current.IsValidTarget(path))
{
throw new ArgumentException(path, "path");
}
// Validate the slice
if (offset < 0)
{
throw new ArgumentOutOfRangeException("offset");
}
if ((length < 0) || (length > 100000000))
{
throw new ArgumentOutOfRangeException("length");
}
// Validate the IP
if (string.IsNullOrEmpty(target))
{
throw new ArgumentException("target");
}
// We do not support multi-cast
if (target.StartsWith("*"))
{
throw new ArgumentException("target");
}
// Find the first IP4 address
var host = Dns.GetHostEntry(target);
var hostIP = host.AddressList.FirstOrDefault(testIP => testIP.AddressFamily == AddressFamily.InterNetwork);
var endPoint = new IPEndPoint(hostIP, port);
// Create socket
using (var socket = new Socket(endPoint.AddressFamily, SocketType.Dgram, ProtocolType.Udp)
{
Blocking = true
})
{
// Last size of stream
long streamSize;
// Collection ends in 0,5 Seconds
var endCollect = DateTime.UtcNow.AddMilliseconds(500);
// As long as necessary
for (; ;)
{
using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 10000000))
{
// Get the size
streamSize = stream.Length;
// And the maximum number of bytes left
var rest = streamSize - offset;
if (rest < 0)
{
throw new ArgumentOutOfRangeException("offset");
}
// None left
if (rest == 0)
{
// Check for retry
if (length < 1)
{
break;
}
if (DateTime.UtcNow >= endCollect)
{
break;
}
// Wait for new data
Thread.Sleep(100);
// Try again
continue;
}
// Correct
if (rest < length)
{
length = (int)rest;
}
// Create buffer
var buffer = new byte[length];
// Move to position
stream.Position = offset;
// Read data
if (stream.Read(buffer, 0, buffer.Length) != buffer.Length)
{
throw new IOException(path);
}
// When we started
var start = DateTime.UtcNow;
// Process all
for (var i = 0; i < buffer.Length;)
{
// Overall time
var delta = DateTime.UtcNow - start;
// Did something - at least
var run = delta.TotalSeconds;
if (run > 0)
{
// Check against our maximum
var rate = i * 8 / run;
if (rate >= 80000000)
{
// Must delay
Thread.Sleep(1);
// Next try
continue;
}
}
// Get the size
var n = Math.Min(buffer.Length - i, UDPStreaming.BufferSize);
// Send to endpoint
socket.SendTo(buffer, i, n, SocketFlags.None, endPoint);
// Adjust
i += n;
}
// Adjust counters
offset += buffer.Length;
length -= buffer.Length;
// Finished
if (length < 1)
{
break;
}
if (DateTime.UtcNow >= endCollect)
{
break;
}
}
}
// Close
socket.Close(10);
// Report size
return(streamSize);
}
}
