/// <summary>
/// Provides functionality to enable processing on an input port.
/// </summary>
/// <param name="managedCallback"></param>
internal virtual void EnablePort(Func <MMALBufferImpl, MMALPortBase, ProcessResult> managedCallback)
{
//We populate the input buffers with user provided data.
this.BufferPool = new MMALPoolImpl(this);
var length = this.BufferPool.Queue.QueueLength();
for (int i = 0; i < length; i++)
{
MMALBufferImpl buffer = this.BufferPool.Queue.GetBuffer();
ProcessResult result = managedCallback(buffer, this);
buffer.ReadIntoBuffer(result.BufferFeed, result.EOF);
this.SendBuffer(buffer);
}
}
internal void ReleaseInputBuffer(MMALBufferImpl bufferImpl)
{
bufferImpl.Release();
if (this.Enabled && this.BufferPool != null)
{
var newBuffer = MMALQueueImpl.GetBuffer(this.BufferPool.Queue.Ptr);
//Populate the new input buffer with user provided image data.
var result = this.ManagedInputCallback(newBuffer, this);
bufferImpl.ReadIntoBuffer(result.BufferFeed, result.EOF);
try
{
if (this.Trigger != null && this.Trigger.CurrentCount > 0 && result.EOF)
{
MMALLog.Logger.Debug("Received EOF. Releasing.");
this.Trigger.Signal();
newBuffer.Release();
}
if (newBuffer != null)
{
this.SendBuffer(newBuffer);
}
else
{
MMALLog.Logger.Warn("Buffer null. Continuing.");
}
}
catch (Exception ex)
{
MMALLog.Logger.Warn($"Buffer handling failed. {ex.Message}");
}
}
}