/// <summary>
///
/// </summary>
/// <param name="context"></param>
private async void OnWebcamWebSocketContext(System.Net.WebSockets.HttpListenerWebSocketContext context)
{
WebSocket webSocket = null;
try
{
// Get the current web socket.
webSocket = context.WebSocket;
CancellationTokenSource receiveCancelToken = new CancellationTokenSource();
byte[] receiveBuffer = new byte[READ_BUFFER_SIZE];
// While the WebSocket connection remains open run a
// simple loop that receives data and sends it back.
while (webSocket.State == WebSocketState.Open)
{
// Receive the next set of data.
ArraySegment <byte> arrayBuffer = new ArraySegment <byte>(receiveBuffer);
WebSocketReceiveResult receiveResult = await webSocket.ReceiveAsync(arrayBuffer, receiveCancelToken.Token);
// If the connection has been closed.
if (receiveResult.MessageType == WebSocketMessageType.Close)
{
break;
}
else
{
byte[] sound = null;
Bitmap[] image = null;
long audioPos = 0;
long videoPos = 0;
// Most of the time one image at a time.
MemoryStream[] imageStream = new MemoryStream[10];
int imageStreamCount = 0;
// Within this loop you can place a check if there are any clients
// connected, and if none then stop capturing until some are connected.
while ((_demuxHttp.ReadFrame(out sound, out image, out audioPos, out videoPos) > 0) && !_stopCapture)
{
// Has an image been captured.
if (image != null && image.Length > 0)
{
// Create a memory stream for each image.
imageStream[0] = new MemoryStream();
imageStreamCount++;
// Save the image to the stream.
image[0].Save(imageStream[0], System.Drawing.Imaging.ImageFormat.Jpeg);
// data to send.
byte[] result = imageStream[0].GetBuffer();
string base64 = Convert.ToBase64String(result);
byte[] base64Bytes = Encoding.Default.GetBytes(base64);
// Send a message back to the client indicating that
// the message was recivied and was sent.
await webSocket.SendAsync(new ArraySegment <byte>(base64Bytes),
WebSocketMessageType.Text, true, CancellationToken.None);
// Cleanup.
image[0].Dispose();
imageStream[0].Dispose();
}
}
}
}
// Cancel the receive request.
if (webSocket.State != WebSocketState.Open)
{
receiveCancelToken.Cancel();
}
}
catch { }
finally
{
// Clean up by disposing the WebSocket.
if (webSocket != null)
{
webSocket.Dispose();
}
}
}
/// <summary>
///
/// </summary>
private async void CaptureAndSend()
{
await System.Threading.Tasks.Task.Run(async() =>
{
byte[] sound = null;
Bitmap[] image = null;
long audioPos = 0;
long videoPos = 0;
int count = 0;
KeyValuePair <HttpListenerWebSocketContext, WebSocket>[] clientCol = null;
// Most of the time one image at a time.
MemoryStream[] imageStream = new MemoryStream[10];
int imageStreamCount = 0;
// Within this loop you can place a check if there are any clients
// connected, and if none then stop capturing until some are connected.
while ((_demuxHttp.ReadFrame(out sound, out image, out audioPos, out videoPos) > 0) && !_stopCapture)
{
imageStreamCount = 0;
count = _clients.Count;
// If count has changed.
if (_clientCount != count)
{
// Get the collection of all clients.
_clientCount = count;
clientCol = _clients.ToArray();
}
// Has an image been captured.
if (image != null && image.Length > 0)
{
// Get all clients and send.
if (clientCol != null)
{
for (int i = 0; i < image.Length; i++)
{
// Create a memory stream for each image.
imageStream[i] = new MemoryStream();
imageStreamCount++;
// Save the image to the stream.
image[i].Save(imageStream[i], System.Drawing.Imaging.ImageFormat.Jpeg);
// Cleanup.
image[i].Dispose();
}
// For each client.
foreach (KeyValuePair <HttpListenerWebSocketContext, WebSocket> client in clientCol)
{
// For each image captured.
for (int i = 0; i < imageStreamCount; i++)
{
// data to send.
byte[] result = imageStream[0].GetBuffer();
string base64 = Convert.ToBase64String(result);
byte[] base64Bytes = Encoding.Default.GetBytes(base64);
try
{
// Send a message back to the client indicating that
// the message was recivied and was sent.
await client.Value.SendAsync(new ArraySegment <byte>(base64Bytes),
WebSocketMessageType.Text, true, CancellationToken.None);
}
catch { }
imageStream[i].Seek(0, SeekOrigin.Begin);
}
}
for (int i = 0; i < imageStreamCount; i++)
{
// Cleanup.
imageStream[i].Dispose();
}
}
}
}
});
}
