private async void WriteModifiedBufferBody(object sender, NewImageBufferReadyEventArgs e)
{
try
{
// using System.Drawing has serious performance implications in the context of video streaming from low powered devices,
// here is a 'simple' example of modifying the image, which will not be fast enough in most use cases.
using var stream = new MemoryStream(e.ImageBuffer.AsMemory().Slice(0, e.Length).ToArray());
Bitmap myBitmap = new Bitmap(stream);
Graphics g = Graphics.FromImage(myBitmap);
g.DrawString(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), new Font("Tahoma", 20), Brushes.White, new PointF(0, 0));
using var ms = new MemoryStream();
myBitmap.Save(ms, ImageFormat.Jpeg);
await HttpContext.Response.BodyWriter.WriteAsync(CreateHeader(e.Length));
await HttpContext.Response.BodyWriter.WriteAsync(ms.ToArray());
await HttpContext.Response.BodyWriter.WriteAsync(CreateFooter());
}
catch (ObjectDisposedException)
{
// ignore this as its thrown when the stream is stopped
}
ArrayPool <byte> .Shared.Return(e.ImageBuffer);
}
private async void WriteBufferBody(object sender, NewImageBufferReadyEventArgs e)
{
try
{
await HttpContext.Response.BodyWriter.WriteAsync(CreateHeader(e.Length));
await HttpContext.Response.BodyWriter.WriteAsync(e.ImageBuffer.AsMemory().Slice(0, e.Length));
await HttpContext.Response.BodyWriter.WriteAsync(CreateFooter());
}
catch (ObjectDisposedException)
{
// ignore this as its thrown when the stream is stopped
}
ArrayPool <byte> .Shared.Return(e.ImageBuffer);
}
