MediaClient: Improve internals and API

* Capabilities() become Kind()
* Use media_client and media_connection to better model
the different situations of the API. Reduce code duplication
and move media_kit structs/methods into private.
* Various API and beauty improvements.
* Introduce id management for media_connections.
* Fix different issues preventing to correctly begin a connection.

headers/private/media/MediaClient.h

@@ -10,6 +10,7 @@
 #include <Buffer.h>
 
 #include <MediaAddOn.h>
+#include <MediaClientDefs.h>
 #include <MediaConnection.h>
 #include <MediaDefs.h>
 #include <MediaNode.h>
@@ -19,19 +20,6 @@
 
 namespace BPrivate { namespace media {
 
-typedef int32 media_client_kind;
-
-enum media_client_kinds {
-	// The node can receive media data.
-	B_MEDIA_RECORDER		= 0x000000001,
-	// The node can send media data to another node.
-	B_MEDIA_PLAYER			= 0x000000002,
-	// The node specify a control GUI which can be used to configure it.
-	B_MEDIA_CONTROLLABLE	= 0x000000004
-};
-
-// TODO: Add file interface
-// TODO: Offline mode is still missing
 
 // BMediaClient is a general purpose class allowing to create any kind
 // of media_node. It automatically manage the expected behavior under
@@ -56,20 +44,25 @@ public:
 											...);
 
 	// TODO: Should allow BControllable capabilities
+	// TODO: Add file interface
+	// TODO: Offline mode is still missing
+
 									BMediaClient(const char* name,
 										media_type type
 											= B_MEDIA_UNKNOWN_TYPE,
 										media_client_kind
-											capabilities = B_MEDIA_PLAYER
+											kind = B_MEDIA_PLAYER
 												& B_MEDIA_RECORDER);
 
 	virtual							~BMediaClient();
 
-			status_t				InitCheck() const;
+			const media_client&		Client() const;
 
 	// Return the capabilities of this BMediaClient instance.
-			media_client_kind		Capabilities() const;
-			media_type				Type() const;
+			media_client_kind		Kind() const;
+			media_type				MediaType() const;
+
+			status_t				InitCheck() const;
 
 	// To connect pass the BMediaConnection to this class or to another BMediaClient,
 	// also in another team the connection object will be valid.
@@ -84,11 +77,6 @@ public:
 	// will automatically connect to this node.
 	virtual BMediaConnection*		BeginConnection(media_connection_kind kind);
 
-	// Those are used if you want to connect to a precise input/output of
-	// another node, the connection returned represents a remote input/output.
-	virtual BMediaConnection*		BeginConnection(const media_input& input);
-	virtual BMediaConnection*		BeginConnection(const media_output& output);
-
 	// Bind internally two connections of the same BMediaClient, so that the
 	// input will be automatically forwarded to the output just after the
 	// ProcessFunc is called. The buffer is automatically recycled too.
@@ -110,18 +98,20 @@ public:
 										BMediaConnection* theirConnection);
 
 	virtual status_t				Connect(BMediaConnection* ourConnection,
-										const dormant_node_info& dormantInfo);
+										const media_connection& theirConnection);
 
+	// Find a free input/output and try to connect to the media_client,
+	// return meaningful error otherwise.
 	virtual status_t				Connect(BMediaConnection* ourConnection,
-										const media_node& node);
+										const media_client& client);
 
 	// Disconnect any connection belonging to this object, to disconnect
 	// a single connection use BMediaConnection::Disconnect().
 	virtual status_t				Disconnect();
 
-			int32					CountConnections() const;
 			int32					CountInputs() const;
 			int32					CountOutputs() const;
+
 			BMediaConnection*		InputAt(int32 index) const;
 			BMediaConnection*		OutputAt(int32 index) const;
 
@@ -164,14 +154,6 @@ public:
 	// when run_mode != B_OFFLINE.
 			bigtime_t				PerformanceTime() const;
 
-	// When a connection is not binded with another, it's your job to send
-	// the buffer to the connection you want. You might want
-	// to ovverride it so that you can track something, in this case
-	// be sure to call the base version.
-	// Automatically recycle the BBuffer.
-	virtual	status_t				SendBuffer(BBuffer* buffer,
-										BMediaConnection* connection);
-
 	// This is supplied to support using this class in a BMediaAddOn.
 	// Default version just return NULL.
 	virtual	BMediaAddOn*			AddOn(int32* id) const;
@@ -180,6 +162,13 @@ public:
 										void* cookie = NULL);
 
 protected:
+	// When a connection is not binded with another, it's your job to send
+	// the buffer to the connection you want. You might want
+	// to ovverride it so that you can track something, in this case
+	// be sure to call the base version.
+	virtual	status_t				SendBuffer(BBuffer* buffer,
+										BMediaConnection* connection);
+
 	virtual void					BufferReceived(BMediaConnection* connection,
 										BBuffer* buffer);
 
@@ -192,24 +181,20 @@ protected:
 			status_t				DisconnectConnection(BMediaConnection* conn);
 			status_t				ResetConnection(BMediaConnection* conn);
 			status_t				ReleaseConnection(BMediaConnection* conn);
+
 private:
 
 			void					_Init();
 			void					_Deinit();
 
-			status_t				_TranslateConnection(BMediaConnection* dest,
-										BMediaConnection* source);
-
-			status_t				_Connect(BMediaConnection* conn,
-										media_node node);
 			status_t				_ConnectInput(BMediaConnection* output,
-										BMediaConnection* input);
+										const media_connection& input);
 			status_t				_ConnectOutput(BMediaConnection* input,
-										BMediaConnection* output);
+										const media_connection& output);
 
 			status_t				fInitErr;
 
-			media_client_kind		fCapabilities;
+			media_client			fClient;
 
 			bool					fRunning;
 			BMediaClientNode*		fNode;
@@ -227,6 +212,9 @@ private:
 			BObjectList<BMediaConnection> fInputs;
 			BObjectList<BMediaConnection> fOutputs;
 
+			int32					fLastInputID;
+			int32					fLastOutputID;
+
 	virtual	void					_ReservedMediaClient0();
 	virtual	void					_ReservedMediaClient1();
 	virtual	void					_ReservedMediaClient2();

headers/private/media/MediaConnection.h

@@ -9,20 +9,15 @@
 #include <BufferGroup.h>
 #include <MediaDefs.h>
 
+#include <MediaClient.h>
+#include <MediaClientDefs.h>
+
 #include "MediaClientNode.h"
 
 
 namespace BPrivate { namespace media {
 
 
-enum media_connection_kind {
-	B_MEDIA_INPUT = 0,
-	B_MEDIA_OUTPUT = 1
-};
-
-
-class BMediaClient;
-
 // The BMediaConnection class is the swiss knife of BMediaClient.
 // It represents a connection between two nodes and allow to create complex
 // nodes without dealing with the unneeded complexity. Two local connections,
@@ -51,7 +46,8 @@ public:
 		B_ASK_TIMER
 	};
 
-	// This function is called when it has come the moment to handle a buffer.
+
+	// This function is called when it is the moment to handle a buffer.
 	typedef void					(*process_hook)(BMediaConnection* connection,
 										BBuffer* buffer);
 
@@ -63,15 +59,16 @@ public:
 
 	virtual							~BMediaConnection();
 
+	const media_connection&			Connection() const;
+	media_connection_id				Id() const;
+	const char*						Name() const;
+
 	// TODO: while most of the objects for both kinds are common
 	// it would be worthwile to have a private implementation
 	// so that we can better model the differences and avoid
 	// problems.
-	bool 							IsOutput() const;
 	bool							IsInput() const;
-
-	const media_destination& 		Destination() const;
-	const media_source&				Source() const;
+	bool 							IsOutput() const;
 
 	bool							HasBinding() const;
 	BMediaConnection*				Binding() const;
@@ -119,11 +116,8 @@ public:
 
 protected:
 									BMediaConnection(BMediaClient* owner,
-										media_connection_kind kind);
-									BMediaConnection(BMediaClient* owner,
-										const media_output& output);
-									BMediaConnection(BMediaClient* owner,
-										const media_input& input);
+										media_connection_kind kind,
+										media_connection_id id);
 
 	// TODO: All notifications should be done into private callbacks like this.
 	void							ConnectedCallback(const media_source& source,
@@ -134,18 +128,17 @@ protected:
 	void							DisconnectCallback(const media_destination& source);
 
 private:
-	void							BuildMediaOutput(media_output* output) const;
-	void							BuildMediaInput(media_input* output) const;
+	media_input						MediaInput() const;
+	media_output					MediaOutput() const;
+
+	const media_source&				Source() const;
+	const media_destination&		Destination() const;
 
 	void							_Init();
 
-	bool							fConnected;
-	bool							fOutputEnabled;
+	media_connection				fConnection;
 
-	media_connection_kind			fKind;
 	BMediaClient*					fOwner;
-	media_node						fOwnerNode;
-	team_id							fOwnerTeam;
 
 	// A connection might be binded so that it will automatically
 	// forward or receive the data from/to a local BMediaConnection,
@@ -156,18 +149,14 @@ private:
 	notify_hook						fNotifyHook;
 	void*							fBufferCookie;
 
-	media_source					fSource;
-	media_destination				fDestination;
-
-	// This represents the node at other end of connection.
-	media_node						fRemoteNode;
-
-	media_format					fFormat;
 	size_t							fBufferSize;
 	bigtime_t						fBufferDuration;
 
 	BBufferGroup*					fBufferGroup;
 
+	bool							fConnected;
+	bool							fOutputEnabled;
+
 	virtual	void					_ReservedMediaConnection0();
 	virtual	void					_ReservedMediaConnection1();
 	virtual	void					_ReservedMediaConnection2();

src/kits/media/Jamfile

@@ -27,6 +27,7 @@ for architectureObject in [ MultiArchSubDirSetup ] {
 			AdapterIO.cpp
 			MediaIO.cpp
 			MediaClient.cpp
+			MediaClientDefs.cpp
 			MediaConnection.cpp
 			MediaRecorder.cpp
 

src/kits/media/MediaClient.cpp

@@ -5,6 +5,8 @@
 
 #include "MediaClient.h"
 
+#include <MediaConnection.h>
+
 #include <MediaRoster.h>
 #include <TimeSource.h>
 
@@ -12,14 +14,18 @@
 
 
 BMediaClient::BMediaClient(const char* name,
-	media_type type, media_client_kind capabilities)
+	media_type type, media_client_kind kind)
 	:
-	fCapabilities(capabilities)
+	fLastInputID(0),
+	fLastOutputID(0)
 {
 	CALLED();
 
 	fNode = new BMediaClientNode(name, this, type);
 	_Init();
+
+	fClient.node = fNode->Node();
+	fClient.kind = kind;
 }
 
 
@@ -31,6 +37,13 @@ BMediaClient::~BMediaClient()
 }
 
 
+const media_client&
+BMediaClient::Client() const
+{
+	return fClient;
+}
+
+
 status_t
 BMediaClient::InitCheck() const
 {
@@ -41,16 +54,16 @@ BMediaClient::InitCheck() const
 
 
 media_client_kind
-BMediaClient::Capabilities() const
+BMediaClient::Kind() const
 {
 	CALLED();
 
-	return fCapabilities;
+	return fClient.kind;
 }
 
 
 media_type
-BMediaClient::Type() const
+BMediaClient::MediaType() const
 {
 	CALLED();
 
@@ -64,29 +77,13 @@ BMediaClient::BeginConnection(media_connection_kind kind)
 {
 	CALLED();
 
-	BMediaConnection* conn = new BMediaConnection(this, kind);
-	AddConnection(conn);
-	return conn;
-}
+	media_connection_id id;
+	if (kind == B_MEDIA_INPUT)
+		id = fLastInputID++;
+	else
+		id = fLastOutputID++;
 
-
-BMediaConnection*
-BMediaClient::BeginConnection(const media_input& input)
-{
-	CALLED();
-
-	BMediaConnection* conn = new BMediaConnection(this, input);
-	AddConnection(conn);
-	return conn;
-}
-
-
-BMediaConnection*
-BMediaClient::BeginConnection(const media_output& output)
-{
-	CALLED();
-
-	BMediaConnection* conn = new BMediaConnection(this, output);
+	BMediaConnection* conn = new BMediaConnection(this, kind, id);
 	AddConnection(conn);
 	return conn;
 }
@@ -143,9 +140,19 @@ BMediaClient::Connect(BMediaConnection* ourConnection,
 {
 	CALLED();
 
-	if (ourConnection->IsOutput() && theirConnection->IsInput())
+	return Connect(ourConnection, theirConnection->Connection());
+}
+
+
+status_t
+BMediaClient::Connect(BMediaConnection* ourConnection,
+	const media_connection& theirConnection)
+{
+	CALLED();
+
+	if (ourConnection->IsOutput() && theirConnection.IsInput())
 		return _ConnectInput(ourConnection, theirConnection);
-	else if (ourConnection->IsInput() && theirConnection->IsOutput())
+	else if (ourConnection->IsInput() && theirConnection.IsOutput())
 		return _ConnectOutput(ourConnection, theirConnection);
 
 	return B_ERROR;
@@ -154,24 +161,7 @@ BMediaClient::Connect(BMediaConnection* ourConnection,
 
 status_t
 BMediaClient::Connect(BMediaConnection* connection,
-	const dormant_node_info& dormantInfo)
-{
-	CALLED();
-
-	media_node node;
-	status_t err = BMediaRoster::CurrentRoster()->InstantiateDormantNode(
-		dormantInfo, &node, B_FLAVOR_IS_GLOBAL);
-
-	if (err != B_OK)
-		return err;
-
-	return Connect(connection, node);
-}
-
-
-status_t
-BMediaClient::Connect(BMediaConnection* connection,
-	const media_node& node)
+	const media_client& client)
 {
 	CALLED();
 
@@ -223,15 +213,6 @@ BMediaClient::ReleaseConnection(BMediaConnection* conn)
 }
 
 
-int32
-BMediaClient::CountConnections() const
-{
-	CALLED();
-
-	return fOutputs.CountItems()+fInputs.CountItems();
-}
-
-
 int32
 BMediaClient::CountInputs() const
 {
@@ -310,7 +291,7 @@ BMediaClient::Start(bool force)
 
 	status_t err = B_OK;
 	for (int32 i = 0; i < CountOutputs(); i++) {
-		media_node remoteNode = OutputAt(i)->fRemoteNode;
+		media_node remoteNode = OutputAt(i)->Connection().RemoteNode();
 		if (remoteNode.kind & B_TIME_SOURCE)
 			err = BMediaRoster::CurrentRoster()->StartTimeSource(
 				remoteNode, BTimeSource::RealTime());
@@ -533,52 +514,38 @@ BMediaClient::_Deinit()
 }
 
 
-status_t
-BMediaClient::_TranslateConnection(BMediaConnection* dest,
-	BMediaConnection* source)
-{
-	CALLED();
-
-	return B_ERROR;
-}
-
-
-status_t
-BMediaClient::_Connect(BMediaConnection* connection,
-	media_node node)
-{
-	CALLED();
-
-	return B_ERROR;
-}
-
-
 status_t
 BMediaClient::_ConnectInput(BMediaConnection* output,
-	BMediaConnection* input)
+	const media_connection& input)
 {
 	CALLED();
 
-	return B_ERROR;
+	if (input.Destination() == media_destination::null)
+		return B_MEDIA_BAD_DESTINATION;
+
+	media_output ourOutput = output->Connection().MediaOutput();
+	media_input theirInput = input.MediaInput();
+	media_format format = output->AcceptedFormat();
+
+	return BMediaRoster::CurrentRoster()->Connect(ourOutput.source,
+		theirInput.destination, &format, &ourOutput, &theirInput,
+		BMediaRoster::B_CONNECT_MUTED);
 }
 
 
 status_t
 BMediaClient::_ConnectOutput(BMediaConnection* input,
-	BMediaConnection* output)
+	const media_connection& output)
 {
 	CALLED();
 
-	if (output->Source() == media_source::null)
+	if (output.Source() == media_source::null)
 		return B_MEDIA_BAD_SOURCE;
 
-	media_input ourInput;
-	media_output theirOutput;
+	media_input ourInput = input->Connection().MediaInput();
+	media_output theirOutput = output.MediaOutput();
 	media_format format = input->AcceptedFormat();
 
-	input->BuildMediaInput(&ourInput);
-	output->BuildMediaOutput(&theirOutput);
-
 	// TODO manage the node problems
 	//fNode->ActivateInternalConnect(false);
 

src/kits/media/MediaClientNode.cpp

@@ -6,6 +6,7 @@
 #include "MediaClientNode.h"
 
 #include <MediaClient.h>
+#include <MediaConnection.h>
 #include <scheduler.h>
 #include <TimeSource.h>
 
@@ -28,11 +29,11 @@ BMediaClientNode::BMediaClientNode(const char* name,
 	CALLED();
 
 	// Configure the node to do the requested jobs
-	if (fOwner->Capabilities() & B_MEDIA_PLAYER)
+	if (fOwner->Kind() & B_MEDIA_PLAYER)
 		AddNodeKind(B_BUFFER_PRODUCER);
-	if (fOwner->Capabilities() & B_MEDIA_RECORDER)
+	if (fOwner->Kind() & B_MEDIA_RECORDER)
 		AddNodeKind(B_BUFFER_CONSUMER);
-	if (fOwner->Capabilities() & B_MEDIA_CONTROLLABLE)
+	if (fOwner->Kind() & B_MEDIA_CONTROLLABLE)
 		AddNodeKind(B_CONTROLLABLE);
 }
 
@@ -174,7 +175,7 @@ BMediaClientNode::GetNextInput(int32* cookie,
 	} else {
 		BMediaConnection* conn = fOwner->InputAt(*cookie);
 		if (conn != NULL) {
-			conn->BuildMediaInput(input);
+			*input = conn->MediaInput();
 			*cookie += 1;
 			return B_OK;
 		}
@@ -230,7 +231,7 @@ BMediaClientNode::Connected(const media_source& source,
 		return B_MEDIA_BAD_DESTINATION;
 
 	conn->ConnectedCallback(source, format);
-	conn->BuildMediaInput(outInput);
+	*outInput = conn->MediaInput();
 	return B_OK;
 }
 
@@ -289,7 +290,7 @@ BMediaClientNode::FormatSuggestionRequested(media_type type,
 	} else {
 		// In that case we return just a very generic format.
 		media_format outFormat;
-		outFormat.type = fOwner->Type();
+		outFormat.type = fOwner->MediaType();
 		*format = outFormat;
 		return B_OK;
 	}
@@ -350,7 +351,7 @@ BMediaClientNode::GetNextOutput(int32* cookie, media_output* output)
 	} else {
 		BMediaConnection* conn = fOwner->OutputAt(*cookie);
 		if (conn != NULL) {
-			conn->BuildMediaOutput(output);
+			*output = conn->MediaOutput();
 			*cookie += 1;
 			return B_OK;
 		}
@@ -413,15 +414,15 @@ BMediaClientNode::PrepareToConnect(const media_source& source,
 	if (conn == NULL)
 		return B_MEDIA_BAD_SOURCE;
 
-	if (conn->fDestination != media_destination::null)
+	if (conn->Destination() != media_destination::null)
 		return B_MEDIA_ALREADY_CONNECTED;
 
-	if (format->type != fOwner->Type())
+	if (format->type != fOwner->MediaType())
 		return B_MEDIA_BAD_FORMAT;
 
-	conn->fDestination = dest;
+	conn->fConnection.destination = dest;
 	conn->SetAcceptedFormat(*format);
-	*out_source = conn->fSource;
+	*out_source = conn->Source();
 	strcpy(name, Name());
 	return B_OK;
 }
@@ -473,7 +474,7 @@ BMediaClientNode::Disconnect(const media_source& source,
 	if (conn == NULL)
 		return;
 
-	if (source == conn->fSource && dest == conn->fDestination)
+	if (source == conn->Source() && dest == conn->Destination())
 		conn->Reset();
 
 	conn->DisconnectCallback(dest);

src/kits/media/MediaConnection.cpp

@@ -5,17 +5,59 @@
 
 #include <MediaConnection.h>
 
-#include <MediaClient.h>
-
 #include "debug.h"
 
 
+BMediaConnection::BMediaConnection(BMediaClient* owner,
+	media_connection_kind kind,
+	media_connection_id id)
+	:
+	fOwner(owner),
+	fBind(NULL)
+{
+	CALLED();
+
+	_Init();
+
+	fConnection.kind = kind;
+	fConnection.id = id;
+	fConnection.client = fOwner->Client();
+
+	if (IsOutput()) {
+		fConnection.source.port = fOwner->fNode->ControlPort();
+		fConnection.source.id = fConnection.id;
+
+		fConnection.destination = media_destination::null;
+	} else {
+		// IsInput()
+		fConnection.destination.port = fOwner->fNode->ControlPort();
+		fConnection.destination.id = fConnection.id;
+
+		fConnection.source = media_source::null;
+	}
+}
+
+
+BMediaConnection::~BMediaConnection()
+{
+	CALLED();
+
+}
+
+
+const media_connection&
+BMediaConnection::Connection() const
+{
+	return fConnection;
+}
+
+
 bool
 BMediaConnection::IsOutput() const
 {
 	CALLED();
 
-	return fKind == B_MEDIA_OUTPUT;
+	return fConnection.IsOutput();
 }
 
 
@@ -24,49 +66,7 @@ BMediaConnection::IsInput() const
 {
 	CALLED();
 
-	return fKind == B_MEDIA_INPUT;
-}
-
-
-void
-BMediaConnection::BuildMediaOutput(media_output* output) const
-{
-	CALLED();
-
-	output->format = AcceptedFormat();
-	output->node = fOwner->fNode->Node();
-	output->source = fSource;
-	output->source.port = fOwner->fNode->ControlPort();
-}
-
-
-void
-BMediaConnection::BuildMediaInput(media_input* input) const
-{
-	CALLED();
-
-	input->format = AcceptedFormat();
-	input->node = fOwner->fNode->Node();
-	input->destination = fDestination;
-	input->destination.port = fOwner->fNode->ControlPort();
-}
-
-
-const media_destination&
-BMediaConnection::Destination() const
-{
-	CALLED();
-
-	return fDestination;
-}
-
-
-const media_source&
-BMediaConnection::Source() const
-{
-	CALLED();
-
-	return fSource;
+	return fConnection.IsInput();
 }
 
 
@@ -93,7 +93,7 @@ BMediaConnection::SetAcceptedFormat(const media_format& format)
 {
 	CALLED();
 
-	fFormat = format;
+	fConnection.format = format;
 }
 
 
@@ -102,7 +102,7 @@ BMediaConnection::AcceptedFormat() const
 {
 	CALLED();
 
-	return fFormat;
+	return fConnection.format;
 }
 
 
@@ -147,11 +147,6 @@ BMediaConnection::Reset()
 {
 	CALLED();
 
-	if (IsOutput())
-		fDestination = media_destination::null;
-	else
-		fSource = media_source::null;
-
 	delete fBufferGroup;
 	fBufferGroup = NULL;
 
@@ -180,52 +175,6 @@ BMediaConnection::SetHooks(process_hook processHook,
 }
 
 
-BMediaConnection::BMediaConnection(BMediaClient* owner,
-	media_connection_kind kind)
-	:
-	fKind(kind),
-	fOwner(owner),
-	fBind(NULL)
-{
-	CALLED();
-
-	_Init();
-}
-
-
-BMediaConnection::BMediaConnection(BMediaClient* owner,
-	const media_output& output)
-	:
-	fKind(B_MEDIA_OUTPUT),
-	fOwner(owner),
-	fBind(NULL)
-{
-	CALLED();
-
-	_Init();
-}
-
-
-BMediaConnection::BMediaConnection(BMediaClient* owner,
-	const media_input& input)
-	:
-	fKind(B_MEDIA_INPUT),
-	fOwner(owner),
-	fBind(NULL)
-{
-	CALLED();
-
-	_Init();
-}
-
-
-BMediaConnection::~BMediaConnection()
-{
-	CALLED();
-
-}
-
-
 void
 BMediaConnection::SetBufferSize(size_t size)
 {
@@ -266,7 +215,7 @@ void
 BMediaConnection::ConnectedCallback(const media_source& source,
 	const media_format& format)
 {
-	fSource = source;
+	fConnection.source = source;
 	SetAcceptedFormat(format);
 
 	if (fNotifyHook != NULL)
@@ -279,8 +228,6 @@ BMediaConnection::ConnectedCallback(const media_source& source,
 void
 BMediaConnection::DisconnectedCallback(const media_source& source)
 {
-	fSource = media_source::null;
-
 	if (fNotifyHook != NULL)
 		(*fNotifyHook)(B_DISCONNECTED, this);
 
@@ -291,14 +238,13 @@ BMediaConnection::DisconnectedCallback(const media_source& source)
 void
 BMediaConnection::ConnectCallback(const media_destination& destination)
 {
-	fDestination = destination;
+	fConnection.destination = destination;
 }
 
 
 void
 BMediaConnection::DisconnectCallback(const media_destination& destination)
 {
-	fDestination = destination;
 }
 
 
@@ -310,9 +256,34 @@ BMediaConnection::_Init()
 	fBufferGroup = NULL;
 	fNotifyHook = NULL;
 	fProcessHook = NULL;
+}
 
-	fSource = media_source::null;
-	fDestination = media_destination::null;
+
+media_input
+BMediaConnection::MediaInput() const
+{
+	return fConnection.MediaInput();
+}
+
+
+media_output
+BMediaConnection::MediaOutput() const
+{
+	return fConnection.MediaOutput();
+}
+
+
+const media_source&
+BMediaConnection::Source() const
+{
+	return fConnection.Source();
+}
+
+
+const media_destination&
+BMediaConnection::Destination() const
+{
+	return fConnection.Destination();
 }