This resource is an insertion point for the streaming infrastructure by connecting the flowgraph to MpStreamFeeders. More...

#include <MprFromStream.h>

Inheritance diagram for MprFromStream:

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Collaboration diagram for MprFromStream:

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Public Member Functions
Creators
	MprFromStream (const UtlString &rName)

virtual	~MprFromStream ()

Manipulators
OsStatus	realize (Url urlSource, int flags, StreamHandle &handle, OsNotification *event=NULL)

OsStatus	realize (UtlString pBuffer, int flags, StreamHandle &handle, OsNotification event=NULL)

OsStatus	prefetch (StreamHandle handle)

OsStatus	play (StreamHandle handle)

OsStatus	rewind (StreamHandle handle)

OsStatus	pause (StreamHandle handle)

OsStatus	stop (StreamHandle handle)

OsStatus	destroy (StreamHandle handle)

OsStatus	getFlags (StreamHandle handle, int &flags)

Public Member Functions inherited from MpAudioResource
	MpAudioResource (const UtlString &rName, int minInputs, int maxInputs, int minOutputs, int maxOutputs)
	Constructor. More...

virtual	~MpAudioResource ()
	Destructor. More...

virtual UtlBoolean	processFrame (void)
	Wrapper around doProcessFrame(). More...

Public Member Functions inherited from MpResource
	MpResource (const UtlString &rName, int minInputs, int maxInputs, int minOutputs, int maxOutputs)
	Constructor. More...

virtual	~MpResource ()
	Destructor. More...

virtual UtlBoolean	disable ()
	Disable this resource. More...

virtual UtlBoolean	enable ()
	Enable this resource. More...

virtual void	reset ()
	This method is invoked for resources that care about stream discontinuities. More...

UtlBoolean	handleMessages (OsMsgQ &msgQ)
	Handles a queue full of incoming messages for this media processing object. More...

void	setVisitState (int newState)
	Sets the visit state for this resource. More...

OsStatus	sendNotification (MpResNotificationMsg::RNMsgType msgType)
	Send a notification with the given message type if notifications are enabled. More...

OsStatus	sendNotification (MpResNotificationMsg &msg)
	Send the given notification message if notifications are enabled. More...

virtual void	setConnectionId (MpConnectionID connectionId)
	Set the ID of a connection this resource belongs to. More...

virtual void	setStreamId (int streamId)
	Set the ID of a stream inside of the connection this resource belongs to. More...

virtual int	getStreamId (void)
	Get the ID of a stream within the connection this resource belongs to. More...

virtual OsStatus	pushBuffer (int inputPort, MpBufPtr &inputBuffer)
	Receive buffer asynchronously from resource at given input port. More...

virtual void	reassignSSRC (void)
	Broadcast announcement that we are changing our SSRC. More...

MpFlowGraphBase *	getFlowGraph () const
	Returns parent flowgraph. More...

void	getInputInfo (int inPortIdx, MpResource *&rpUpstreamResource, int &rUpstreamPortIdx)
	Returns information about the upstream end of a connection. More...

const UtlString &	getName () const
	Returns the name associated with this resource. More...

void	getOutputInfo (int outPortIdx, MpResource *&rpDownstreamResource, int &rDownstreamPortIdx)
	Returns information about the downstream end of a connection. More...

int	getVisitState ()
	Returns the current visit state for this resource. More...

int	maxInputs () const
	Returns the maximum number of inputs supported by this resource. More...

int	maxOutputs () const
	Returns the maximum number of outputs supported by this resource. More...

int	minInputs () const
	Returns the minimum number of inputs required by this resource. More...

int	minOutputs () const
	Returns the minimum number of outputs required by this resource. More...

int	numInputs () const
	Returns the number of resource inputs that are currently connected. More...

int	numOutputs () const
	Returns the number of resource outputs that are currently connected. More...

virtual MpConnectionID	getConnectionId (void) const
	Get the ID of a connection this resource belongs to. More...

int	reserveFirstUnconnectedInput ()
	Find the first unconnected input port and reserve it. More...

int	reserveFirstUnconnectedOutput ()
	Find the first unconnected output port and reserve it. More...

UtlContainableType	getContainableType () const
	Get the ContainableType for a UtlContainable derived class. More...

virtual OsStatus	getCurrentLatency (int &latency, int input=0, int output=0) const
	Get current input to output latency (in samples) More...

UtlBoolean	isEnabled () const
	Returns TRUE is this resource is currently enabled, FALSE otherwise. More...

UtlBoolean	isInputConnected (int portIdx)
	Returns TRUE if portIdx is valid and the indicated input is connected, FALSE otherwise. More...

UtlBoolean	isInputUnconnected (int portIdx)
	Returns TRUE if portIdx is valid and the indicated input is not connected, FALSE otherwise. More...

UtlBoolean	isOutputConnected (int portIdx)
	Returns TRUE if portIdx is valid and the indicated output is connected, FALSE otherwise. More...

UtlBoolean	isOutputUnconnected (int portIdx)
	Returns TRUE if portIdx is valid and the indicated output is not connected, FALSE otherwise. More...

UtlBoolean	areNotificationsEnabled () const
	Returns TRUE if notification sending is enabled on this resource. More...

virtual UtlBoolean	isAsynchInput (int inputIndex)
	Takes asynchronous input (pushBuffer). More...

Protected Member Functions
OsStatus	setStreamSource (MpStreamFeeder *pFeeder)

MpStreamFeeder *	getStreamSource ()

Protected Member Functions inherited from MpResource
virtual UtlBoolean	handleMessage (MpResourceMsg &rMsg)
	Handles an incoming resource message for this media processing object. More...

virtual UtlBoolean	handleEnable ()
	perform the enable operation on the resource More...

virtual UtlBoolean	handleDisable ()
	perform the disable operation on the resource More...

void	setInputBuffer (int inPortIdx, const MpBufPtr &pBuf)
	If there already is a buffer stored for this input port, delete it. Then store `pBuf` for the indicated input port. More...

OsStatus	postMessage (MpFlowGraphMsg &rMsg)
	Post a message from this resource. More...

OsStatus	postMessage (MpResourceMsg &rMsg)
	Post a message for this resource. More...

UtlBoolean	pushBufferDownsream (int outPortIdx, const MpBufPtr &pBuf)
	Makes `pBuf` available to resource connected to the `outPortIdx` output port of this resource. More...

virtual OsStatus	setFlowGraph (MpFlowGraphBase *pFlowGraph)
	Associates this resource with the indicated flow graph. More...

virtual OsStatus	setNotificationsEnabled (UtlBoolean enable)
	Sets whether or not this resource should send notifications. More...

virtual UtlBoolean	connectInput (MpResource &rFrom, int fromPortIdx, int toPortIdx)
	Connects the `toPortIdx` input port on this resource to the `fromPortIdx` output port of the `rFrom` resource. More...

virtual UtlBoolean	connectOutput (MpResource &rTo, int toPortIdx, int fromPortIdx)
	Connects the `fromPortIdx` output port on this resource to the `toPortIdx` input port of the `rTo` resource. More...

virtual UtlBoolean	disconnectInput (int inPortIdx)
	Removes the connection to the `inPortIdx` input port of this resource. More...

virtual UtlBoolean	disconnectOutput (int outPortIdx)
	Removes the connection to the `outPortIdx` output port of this resource. More...

void	setName (const UtlString &rName)
	Sets the name that is associated with this resource. More...

Private Types
enum	AddlMsgTypes { SOURCE_PLAY = MpFlowGraphMsg::RESOURCE_SPECIFIC_START, SOURCE_PAUSE, SOURCE_REWIND, SOURCE_STOP, SOURCE_DESTROY, SOURCE_RENDER }

Private Member Functions
virtual UtlBoolean	doProcessFrame (MpBufPtr inBufs[], MpBufPtr outBufs[], int inBufsSize, int outBufsSize, UtlBoolean isEnabled, int samplesPerFrame, int samplesPerSecond)
	This method does the real work for the media processing resource and must be defined in each class derived from this one. More...

virtual UtlBoolean	handleMessage (MpFlowGraphMsg &rMsg)
	Handle messages for this resource. More...

UtlBoolean	handleRender (MpStreamFeeder *pFeeder)

UtlBoolean	handlePlay (MpStreamFeeder *pFeeder)

UtlBoolean	handleRewind (MpStreamFeeder *pFeeder)

UtlBoolean	handlePause (MpStreamFeeder *pFeeder)

UtlBoolean	handleStop (MpStreamFeeder *pFeeder)

UtlBoolean	handleDestroy (MpStreamFeeder *pFeeder)

	MprFromStream (const MprFromStream &rMprFromStream)
	Copy constructor (not implemented for this class) More...

MprFromStream &	operator= (const MprFromStream &rhs)
	Assignment operator (not implemented for this class) More...

MpStreamFeeder *	getStreamFeeder (StreamHandle handle)
	Get the stream feeder for the given handle. More...

MpStreamFeeder *	removeStreamFeeder (StreamHandle handle)
	Removes the stream feeder from the stream list. More...

void	destroyFeeders ()
	Stops, destroys, and frees all stream feeders. More...

Private Attributes
OsNotification *	mpNotify

MpStreamFeeder *	mpStreamRenderer

FeederEvent	mEventState

UtlBoolean	mbStreamChange

int	miStreamCount
	Count for generating unique handles. More...

OsLockingList	mStreamList
	List of stream players. More...

Additional Inherited Members
Public Types inherited from MpResource
enum	VisitState { NOT_VISITED, IN_PROGRESS, FINISHED }
	Graph traversal states that are used when running a topological sort to order resources within a flow graph. More...

enum	{ ASSOCIATED_LATENCY =-1, INF_LATENCY =-1 }

Static Public Member Functions inherited from MpResource
static OsStatus	disable (const UtlString &namedResource, OsMsgQ &fgQ)
	Post a message to disable the resource named. More...

static OsStatus	enable (const UtlString &namedResource, OsMsgQ &fgQ)
	Post a message to enable the resource named. More...

static OsStatus	setNotificationsEnabled (UtlBoolean enable, const UtlString &namedResource, OsMsgQ &fgQ)
	Post a message to enable or disable resource notifications on the named resource. More...

static void	resourceInfo (MpResource *pResource, int index)
	Displays information on the console about the specified resource. More...

Static Public Attributes inherited from MpResource
static const UtlContainableType	TYPE = "MpResource"
	Class name, used for run-time checks. More...

Protected Attributes inherited from MpResource
MpFlowGraphBase *	mpFlowGraph
	flow graph this resource belongs to More...

MpConnectionID	mConnectionId
	The ID of connection this resource belongs to. More...

int	mStreamId

UtlBoolean	mIsEnabled
	TRUE if resource is enabled, FALSE otherwise. More...

OsRWMutex	mRWMutex
	reader/writer lock for synchronization More...

MpBufPtr *	mpInBufs
	input buffers for this resource More...

MpBufPtr *	mpOutBufs
	output buffers for this resource More...

Conn *	mpInConns
	input connections for this resource More...

Conn *	mpOutConns
	output connections for this resource More...

int	mMaxInputs
	maximum number of inputs More...

int	mMaxOutputs
	maximum number of outputs More...

int	mMinInputs
	number of required inputs More...

int	mMinOutputs
	number of required outputs More...

int	mNumActualInputs
	actual number of connected inputs More...

int	mNumActualOutputs
	actual number of connected outputs More...

int	mVisitState
	(used by flow graph topological sort alg.) More...

UtlBoolean	mNotificationsEnabled
	Whether we should send notifications or not. More...

OsBSem	mLock
	used mainly to make safe changes to ports More...

Static Protected Attributes inherited from MpResource
static const OsTime	sOperationQueueTimeout = OsTime::OS_INFINITY
	The timeout for message operations for all resources when posting to the flowgraph queue. More...

Detailed Description

This resource is an insertion point for the streaming infrastructure by connecting the flowgraph to MpStreamFeeders.

Whenever requested to "realize" a stream, this code will create a MpStreamFeeder which inturn creates a StreamDataSource and a StreamFormatDecoder. Many MpStreamFeeders may be managed/created by a single MprFromStream, however, only one can be active at only one point.

For thread safety, all operations (play, destroy, rewind, etc.) result in a message being posted to itself. This forces all of the tasks to be performed on the same task context. The "realize" operation is an exception, where it is processed on the called context.

Additionally, the code creates a level of indirection between between the implementation and calling parties (application layer). All MpStreamFeeders created by this resource are collected within a list (mStreamList) and only a handle to the resource is exposed to application layer. Handles are unique for an instance of a MprFromStream. If the destruct is called for MprFromStream and the mStreamList is not null, the list is purged.

This class bubbles events to the MpStreamFeeder by calling the fromStreamUpdate callback on the feeder itself.

Member Enumeration Documentation

enum AddlMsgTypes

private

Enumerator
SOURCE_PLAY
SOURCE_PAUSE
SOURCE_REWIND
SOURCE_STOP
SOURCE_DESTROY
SOURCE_RENDER

Constructor & Destructor Documentation

MprFromStream ( const UtlString & rName )

~MprFromStream ( )

virtual

MprFromStream ( const MprFromStream & rMprFromStream )

private

Copy constructor (not implemented for this class)

Member Function Documentation

OsStatus realize	(	Url	urlSource,
		int	flags,
		StreamHandle &	handle,
		OsNotification *	event = `NULL`
	)

OsStatus realize	(	UtlString *	pBuffer,
		int	flags,
		StreamHandle &	handle,
		OsNotification *	event = `NULL`
	)

OsStatus prefetch ( StreamHandle handle )

OsStatus play ( StreamHandle handle )

OsStatus rewind ( StreamHandle handle )

OsStatus pause ( StreamHandle handle )

OsStatus stop ( StreamHandle handle )

OsStatus destroy ( StreamHandle handle )

OsStatus getFlags	(	StreamHandle	handle,
		int &	flags
	)

OsStatus setStreamSource ( MpStreamFeeder * pFeeder )

protected

MpStreamFeeder * getStreamSource ( )

protected

UtlBoolean doProcessFrame	(	MpBufPtr	inBufs[],
		MpBufPtr	outBufs[],
		int	inBufsSize,
		int	outBufsSize,
		UtlBoolean	isEnabled,
		int	samplesPerFrame,
		int	samplesPerSecond
	)

privatevirtual

This method does the real work for the media processing resource and must be defined in each class derived from this one.

Parameters

inBufs	(in) array of pointers to input buffers for the resource
outBufs	(out) array of pointers to output buffers produce by the resource
inBufsSize	(in) size of the inBufs array
outBufsSize	(in) size of the outBufs array
isEnabled	(in) indicates whether this resource has been enabled
samplesPerFrame	(in) samples to produce per frame processing interval
samplesPerSecond	(in) samples to produce per second

Returns: TRUE if successful, FALSE otherwise.

Implements MpAudioResource.

UtlBoolean handleMessage ( MpFlowGraphMsg & rMsg )

privatevirtual

Handle messages for this resource.

Reimplemented from MpResource.

UtlBoolean handleRender ( MpStreamFeeder * pFeeder )

private

UtlBoolean handlePlay ( MpStreamFeeder * pFeeder )

private

UtlBoolean handleRewind ( MpStreamFeeder * pFeeder )

private

UtlBoolean handlePause ( MpStreamFeeder * pFeeder )

private

UtlBoolean handleStop ( MpStreamFeeder * pFeeder )

private

UtlBoolean handleDestroy ( MpStreamFeeder * pFeeder )

private

MprFromStream& operator= ( const MprFromStream & rhs )

private

Assignment operator (not implemented for this class)

MpStreamFeeder * getStreamFeeder ( StreamHandle handle )

private

Get the stream feeder for the given handle.

MpStreamFeeder * removeStreamFeeder ( StreamHandle handle )

private

Removes the stream feeder from the stream list.

The Stream feeder is returned if found, someone else is responsible for deleting it.

void destroyFeeders ( )

private

Stops, destroys, and frees all stream feeders.

Member Data Documentation

OsNotification* mpNotify

private

MpStreamFeeder* mpStreamRenderer

private

FeederEvent mEventState

private

UtlBoolean mbStreamChange

private

int miStreamCount

private

Count for generating unique handles.

OsLockingList mStreamList

private

List of stream players.

Public Member Functions

Protected Member Functions

Private Types

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation