public static string GetMimeType(this OutputImageFormat val)
{
return(val.GetType()
.GetMember(val.ToString())
.FirstOrDefault()
?.GetCustomAttribute <MimeTypeAttribute>(false)
?.Description
?? val.ToString());
}
public async Task StartFrameReaderAsync(InputSource inputSource, OutputImageFormat outputImageFormat, CancellationToken cancellationToken)
{
var inputArgs = $"-y {inputSource.InputCommand}";
var outputArgs = $"-c:v {outputImageFormat.ToString().ToLower()} -f image2pipe -";
var startInfo = new ProcessStartInfo
{
FileName = this._ffmpegPath,
Arguments = $"{inputArgs} {outputArgs}",
UseShellExecute = false,
CreateNoWindow = true,
RedirectStandardInput = true,
RedirectStandardError = true,
RedirectStandardOutput = true,
};
using (var ffmpegProcess = new Process {
StartInfo = startInfo
})
{
ffmpegProcess.ErrorDataReceived += this.ProcessDataReceived;
ffmpegProcess.Start();
ffmpegProcess.BeginErrorReadLine();
using (var frameOutputStream = ffmpegProcess.StandardOutput.BaseStream)
{
var index = 0;
var buffer = new byte[32768];
var imageData = new List <byte>();
byte[] imageHeader = null;
while (!cancellationToken.IsCancellationRequested)
{
var length = await frameOutputStream.ReadAsync(buffer, 0, buffer.Length);
if (length == 0)
{
break;
}
if (imageHeader == null)
{
imageHeader = buffer.Take(5).ToArray();
}
if (buffer.Take(5).SequenceEqual(imageHeader))
{
if (imageData.Count > 0)
{
this.NewImageReceived?.Invoke(imageData.ToArray());
imageData.Clear();
index++;
}
}
imageData.AddRange(buffer.Take(length));
}
frameOutputStream.Close();
}
ffmpegProcess.ErrorDataReceived -= this.ProcessDataReceived;
ffmpegProcess.WaitForExit(1000);
if (!ffmpegProcess.HasExited)
{
ffmpegProcess.Kill();
}
}
}
