public HttpContent CreateHttpContent(byte[] ContentBytes, string MimeType, long?From, long?To)
{
long contentExtent = (long)ContentBytes.Length - 1;
VideoStreamContentByteRange byteRange = VideoStreamFactoryHelper.ExtractByteRange(From, To, contentExtent);
if (byteRange.From < 0 || byteRange.From > contentExtent || byteRange.To > contentExtent)
{
string errorMessage = "The requested range (bytes="
+ ((From.HasValue) ? From.Value.ToString() : "")
+ "-"
+ ((To.HasValue) ? To.Value.ToString() : "")
+ ") does not overlap with the current extent of the selected resource.";
throw new InvalidByteRangeException(new ContentRangeHeaderValue(0, ContentBytes.Length), errorMessage);
}
VideoStreamContentByteRange[] singleByteRange = new VideoStreamContentByteRange[1];
singleByteRange[0] = byteRange;
var result = new VideoStreamContent(this, ContentBytes, MimeType, _bufferSize, _throttleRate, singleByteRange);
result.Headers.ContentRange = new ContentRangeHeaderValue(byteRange.From, byteRange.To, ContentBytes.Length);
result.Headers.ContentType = new MediaTypeHeaderValue(MimeType);
return(result);
}
public VideoStreamContent(VideoStreamFactory Factory, byte[] ContentBytes, string MimeType, int BufferSize, int ThrottleRate, VideoStreamContentByteRange[] ByteRanges)
{
_source = ContentBytes;
_bufferSize = BufferSize;
_throttleRate = ThrottleRate;
_mimeType = MimeType;
_byteRanges = new VideoStreamContentByteRange[ByteRanges.Length];
for (int i = 0; i < ByteRanges.Length; i++)
{
long from = ByteRanges[i].From;
long to = ByteRanges[i].To + 1;
_byteRanges[i] = new VideoStreamContentByteRange(from, to);
}
_factory = Factory;
}
private async Task ThrottledWrite(byte[] SourceBytes, string MimeType, Stream OutStream, VideoStreamContentByteRange[] ByteRanges, int BufferSize, int ThrottleRate)
{
await Task.Factory.StartNew(() =>
{
try
{
for (int i = 0; i < ByteRanges.Length; i++)
{
VideoStreamContentByteRange currentRange = ByteRanges[i];
int indexFrom = (int)currentRange.From;
int countTo = (int)(currentRange.To - currentRange.From);
if (ByteRanges.Length > 1)
{
using (StreamWriter streamWriter = new StreamWriter(OutStream, System.Text.Encoding.ASCII, 4096, leaveOpen: true))
{
if (i > 0)
{
streamWriter.WriteLine();
}
streamWriter.WriteLine("--" + _byteRangeBoundary.ToString());
streamWriter.WriteLine("Content-Type: " + MimeType);
streamWriter.WriteLine("Content-Range: bytes " + currentRange.From.ToString() + "-" + (currentRange.To - 1).ToString() + "/" + SourceBytes.Length);
streamWriter.WriteLine();
OutStream.Flush();
}
}
byte[] buffer = new byte[BufferSize];
int bytesRead = 1;
using (MemoryStream streamBytes = new MemoryStream(buffer: SourceBytes, index: indexFrom, count: countTo, writable: false))
{
while (bytesRead > 0)
{
bytesRead = streamBytes.Read(buffer, 0, BufferSize);
OutStream.Write(buffer, 0, bytesRead);
OutStream.Flush();
if (_abort)
{
break;
}
Thread.Sleep(ThrottleRate);
}
}
}
if (ByteRanges.Length > 1)
{
using (StreamWriter streamWriter = new StreamWriter(OutStream, System.Text.Encoding.ASCII, 4096, leaveOpen: true))
{
streamWriter.WriteLine();
streamWriter.WriteLine("--" + _byteRangeBoundary.ToString() + "--");
OutStream.Flush();
}
}
}
catch (HttpException ex)
{
var snoop = ex;
}
finally
{
OutStream.Dispose();
}
}, TaskCreationOptions.LongRunning);
}
