/// <summary>
/// Gets the next video frame from the MediaStream track.
/// If internal processing is slower than the incoming frame rate, new frames
/// will be dropped from the incoming stream. Once the input buffer is full,
/// frames will be dropped until <code>RecycleFrame()</code> is called to free
/// a spot for another frame to be buffered.
/// If there are no frames in the input buffer,
/// <code>OkCompletionPending</code> will be returned immediately and the
/// <code>HandleFrame</code> event handler will be called when a new frame is received or some
/// error happens.
/// </summary>
/// <returns>Error code</returns>
public PPError GetFrame()
{
var action = new Action <PPError, PPResource>((result, resource) =>
{
OnGetFrame(new VideoFrameInfo(result, resource));
});
var callback = new CompletionCallbackWithOutput <PPResource>(new CompletionCallbackWithOutputFunc <PPResource>(action));
return((PPError)PPBMediaStreamVideoTrack.GetFrame(this, out callback.OutputAdapter.output, callback));
}
private async Task <VideoFrameInfo> GetFrameAsyncCore(MessageLoop messageLoop = null)
{
var tcs = new TaskCompletionSource <VideoFrameInfo>();
EventHandler <VideoFrameInfo> handler = (s, e) => { tcs.TrySetResult(e); };
try
{
HandleFrame += handler;
if (MessageLoop == null && messageLoop == null)
{
GetFrame();
}
else
{
Action <PPError> action = new Action <PPError>((e) =>
{
var output = new APIArgumentAdapter <PPResource>();
var result = (PPError)PPBMediaStreamVideoTrack.GetFrame(this, out output.output,
new BlockUntilComplete());
tcs.TrySetResult(new VideoFrameInfo(result, output.Output));
}
);
InvokeHelper(action, messageLoop);
}
return(await tcs.Task);
}
catch (Exception exc)
{
Console.WriteLine(exc.Message);
tcs.SetException(exc);
return(new VideoFrameInfo(PPError.Aborted, PPResource.Empty));
}
finally
{
HandleFrame -= handler;
}
}
