[英]How can I force send response stream?
我正在發送響應流音頻,有時文件的大小為2gb,因此我無法發送整個文件。 我發送了1mb的數據塊。
當播放音頻並到達播放1mb的位置時,它會尋找下一個1mb,因此在播放中會產生微小的延遲,因為它正在等待下一個兆字節的加載。
因此,我的問題是,即使在請求之前,我該如何強制發送下一個兆字節? 可能嗎?
using (var fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{
// Default positions
var startPosition = 0;
var endPosition = 1048576; // 1mb
var rangeString = Request.Headers["Range"].FirstOrDefault();
var totalLength = fs.Length;
// Get positions
if (rangeString != null)
{
var rangeHeaders = rangeString.Split(new[] { '=', '-' });
startPosition = Convert.ToInt32(rangeHeaders[1]);
if (rangeHeaders.Length > 2 && !string.IsNullOrEmpty(rangeHeaders[2]))
{
endPosition = Convert.ToInt32(rangeHeaders[2]);
}
else
{
endPosition = startPosition + 1048576;
}
}
// Read bytes and slice 1mb
var takeHowMuch = endPosition - startPosition;
var outputBytes = new byte[takeHowMuch];
using (var reader = new BinaryReader(fs))
{
reader.BaseStream.Seek(startPosition, SeekOrigin.Begin);
reader.Read(outputBytes, 0, endPosition - startPosition);
}
return new Response
{
StatusCode = HttpStatusCode.PartialContent,
ContentType = "audio/mp3",
Headers =
{
new KeyValuePair<string, string>("Accept-Ranges", "bytes"),
new KeyValuePair<string, string>("Content-Range", string.Format("bytes {0}-{1}/{2}", startPosition, endPosition , totalLength)),
new KeyValuePair<string, string>("Content-Length", outputBytes.Length.ToString(CultureInfo.InvariantCulture))
},
Contents = s =>
{
s.Write(outputBytes, 0, takeHowMuch);
s.Flush();
}
};
}
return new Response
{
StatusCode = HttpStatusCode.PartialContent,
ContentType = "audio/mp3",
Headers =
{
new KeyValuePair<string, string>("Accept-Ranges", "bytes"),
new KeyValuePair<string, string>("Content-Range", string.Format("bytes {0}-{1}/{2}", startPosition, endPosition , totalLength)),
new KeyValuePair<string, string>("Content-Length", outputBytes.Length.ToString(CultureInfo.InvariantCulture))
},
Contents = s =>
{
// I can write here multiple times thus sending multiple chunks
s.Write(outputBytes, 0, takeHowMuch);
s.Write(otherOutputBytes, 0, takeHowMuch);
}
};
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