internal void ReleaseOutputBuffer(MMALBufferImpl bufferImpl)
{
bufferImpl.Release();
bufferImpl.Dispose();
try
{
if (!this.Enabled)
{
MMALLog.Logger.Warn("Port not enabled.");
}
if (this.BufferPool == null)
{
MMALLog.Logger.Warn("Buffer pool null.");
}
if (this.Enabled && this.BufferPool != null)
{
var newBuffer = MMALQueueImpl.GetBuffer(this.BufferPool.Queue.Ptr);
if (newBuffer != null)
{
this.SendBuffer(newBuffer);
}
else
{
MMALLog.Logger.Warn("Buffer null. Continuing.");
}
}
}
catch (Exception e)
{
MMALLog.Logger.Warn($"Unable to send buffer header. {e.Message}");
}
}
/// <summary>
/// The native callback MMAL passes buffer headers to
/// </summary>
/// <param name="port">The port the buffer is sent to</param>
/// <param name="buffer">The buffer header</param>
internal override void NativeOutputPortCallback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
{
lock (MMALPortBase.OutputLock)
{
var bufferImpl = new MMALBufferImpl(buffer);
if (MMALCameraConfig.Debug)
{
bufferImpl.PrintProperties();
}
if (bufferImpl.Length > 0)
{
this.ManagedOutputCallback(bufferImpl, this);
}
//Ensure we release the buffer before any signalling or we will cause a memory leak due to there still being a reference count on the buffer.
this.ReleaseOutputBuffer(bufferImpl);
//If this buffer signals the end of data stream, allow waiting thread to continue.
if (bufferImpl.Properties.Any(c => c == MMALBufferProperties.MMAL_BUFFER_HEADER_FLAG_FRAME_END ||
c == MMALBufferProperties.MMAL_BUFFER_HEADER_FLAG_TRANSMISSION_FAILED))
{
MMALLog.Logger.Debug("End of stream. Signaling completion...");
if (this.Trigger != null && this.Trigger.CurrentCount > 0)
{
this.Trigger.Signal();
}
}
}
}
internal override void NativeInputPortCallback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
{
lock (MMALPortBase.InputLock)
{
var bufferImpl = new MMALBufferImpl(buffer);
if (MMALCameraConfig.Debug)
{
bufferImpl.PrintProperties();
}
this.ReleaseInputBuffer(bufferImpl);
}
}
/// <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);
}
}
/// <summary>
/// The native callback MMAL passes buffer headers to.
/// </summary>
/// <param name="port">The port the buffer is sent to.</param>
/// <param name="buffer">The buffer header.</param>
internal override void NativeOutputPortCallback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
{
lock (MMALPortBase.OutputLock)
{
if (MMALCameraConfig.Debug)
{
MMALLog.Logger.Debug("In native output callback");
}
var bufferImpl = new MMALBufferImpl(buffer);
if (MMALCameraConfig.Debug)
{
bufferImpl.PrintProperties();
}
var triggered = this.Trigger != null && this.Trigger.CurrentCount == 0;
var failed = bufferImpl.Properties.Any(c => c == MMALBufferProperties.MMAL_BUFFER_HEADER_FLAG_TRANSMISSION_FAILED);
var eos = bufferImpl.Properties.Any(c => c == MMALBufferProperties.MMAL_BUFFER_HEADER_FLAG_FRAME_END ||
c == MMALBufferProperties.MMAL_BUFFER_HEADER_FLAG_EOS) || this.ComponentReference.ForceStopProcessing;
if ((bufferImpl.CheckState() && bufferImpl.Length > 0 && !eos && !failed && !triggered) || (eos && !triggered))
{
this.ManagedOutputCallback.Callback(bufferImpl);
}
// Ensure we release the buffer before any signalling or we will cause a memory leak due to there still being a reference count on the buffer.
this.ReleaseOutputBuffer(bufferImpl);
// If this buffer signals the end of data stream, allow waiting thread to continue.
if (eos || failed)
{
if (this.Trigger != null && this.Trigger.CurrentCount > 0)
{
MMALLog.Logger.Debug("End of stream. Signaling completion...");
this.Trigger.Signal();
}
}
}
}
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}");
}
}
}
/// <summary>
/// Delegate to process the buffer header containing image data
/// </summary>
/// <param name="buffer">The current buffer header being processed</param>
/// <param name="port">The port we're currently processing on</param>
public virtual void ManagedOutputCallback(MMALBufferImpl buffer, MMALPortBase port)
{
var data = buffer.GetBufferData();
this.Handler?.Process(data);
}
/// <summary>
/// Delegate to process the buffer header containing image data
/// </summary>
/// <param name="buffer">The current buffer header being processed</param>
/// <param name="port">The port we're currently processing on</param>
public virtual ProcessResult ManagedInputCallback(MMALBufferImpl buffer, MMALPortBase port)
{
return(this.Handler?.Process());
}
internal void Put(MMALBufferImpl buffer)
{
MMALQueue.mmal_queue_put(this.Ptr, buffer.Ptr);
}
public virtual void ManagedConnectionCallback(MMALBufferImpl buffer)
{
MMALLog.Logger.Debug("Inside Managed connection callback");
}
/// <summary>
/// Send a buffer header to a port.
/// </summary>
/// <param name="buffer"></param>
internal void SendBuffer(MMALBufferImpl buffer)
{
MMALCheck(MMALPort.mmal_port_send_buffer(this.Ptr, buffer.Ptr), "Unable to send buffer header.");
}
internal static MMALEventFormat GetEventFormat(MMALBufferImpl buffer)
{
var ev = MMALEvents.mmal_event_format_changed_get(buffer.Ptr);
return(new MMALEventFormat(Marshal.PtrToStructure <MMAL_ES_FORMAT_T>((IntPtr)ev->Format), ev->Format));
}
