Standard destructor.

Adds a data sink to the datapath and, if the source already exists, tries to establish a connection between the source and sink.

Adds a data source to the datapath and, if the sink already exists, tries to establish a connection between the source and sink.

Indicates the data sink has emptied the buffer.

Called by the CMMFDataPath's MDataSink when it has emptied the buffer

Indicates the data source has filled the specified buffer.

Called by the CMMFDataPath's MDataSource when it has filled the buffer.

Tests whether the data path can create a sink buffer.

The default implementation returns false.

Tests whether the data path can create a source buffer.

Would expect datapath to always return NULL, so this is a default implementation of a pure virtual from MDataSink .

The default implementation returns EFalse.

Uses the AO mechanism to drive state changes between sources and sinks.

RunL() moves and assigns buffers between its attached MDataSource/MDataSinks.

Sets the play window to the full length of clip.

Takes UID of codec on construction, and if not an NULL codec sets the datapath up for codec instantiation.

Constructs a sink.

Overridable constuction specific to this datasource.

The default implementation leaves with KErrNotSupported.

Constructs a source.

The default implementation leaves with KErrNotSupported.

Creates a sink buffer according to the specifed media ID.

Intended for synchronous usage (buffers supplied by datapath for an MDataSink ). This method is essentially a dummy implementation of an MDataSink pure virtual.

The default implementation returns NULL.

Creates a sink buffer according to the specifed media ID and reference.

Intended for asynchronous usage (buffers supplied by Devsound device). This method is essentially a dummy implementation of an MDataSink pure virtual.

The default implementation returns NULL.

Creates a source buffer.

Intended for synchronous usage (buffers supplied by datapath for a MDataSource ) This method is essentially a dummy implementation of an MDataSource pure virtual.

The default implementation leaves with KErrNotSupported and returns NULL.

Creates a source buffer according to the specifed media ID and reference.

Intended for asynchronous usage (buffers supplied by datapath for a MDataSource ) This method is essentially a dummy implementation of an MDataSource pure virtual.

The default implementation leaves with KErrNotSupported and returns NULL.

Cancels the clip.

The default implementation is empty.

Delete source and/or sink buffers that are owned by DataPath.

Ownership indicated by iSrcBufRef and iSnkBufRef.

Ownership is assigned during buffer allocation within the datapath PrimeL() .

This is a virtual function datapath (or derivations off) that can be implemented or may be left blank for default behaviour.

Additional Pause method specific to this datapath.

This is a virtual function datapath (or derivations off) that can be implemented but may be left blank for default behaviour.

Additional Pause method specific to this datapath.

The DataPath implements pause by recording the current position and stopping the source and sink. When Play is called the DataPath uses the stored position as the starting point and resumes playing. The reason for this (rather than using the PauseL() API on sources and sinks) is that some implementations do not support a suitable pause, therefore the DataPath is implemented to support the lowest common denominator.

Note: A suitable pause implementation will retain any buffers in use. There will be no need to call PrimeL() prior to PlayL() .

Passes error handling and general messages up to clients.

This is a virtual function datapath (or derivations off) that can be implemented but may be left blank for default behaviour.

Additional Stop() method specific to this datapath.

Returns the duration of the clip.

Clears the specified buffer.

Pure virtual dummy implementation, not needed by datapath comes from MDataSink - CMMFData path is a sink to its MDataSource .

This is only required for an active push MDataSource requesting a buffer empty.

Forces and end of data state on the datapath

Fills the specified buffer.

Pure virtual dummy implementation, not needed by datapath comes from MDataSink - CMMFData path is a source to its MDataSink

Only required for an active pull MDataSink requesting a buffer fill. The default implementation is empty.

Allocates and constructs a data path.

Use this function if the codec UID is not already known by CMMFController and there is no data path ambiguity - ie only one data path is possible.

Will create codec via fourCC.

Allocates and constructs a data path according to the specified media ID.

Use this function if the codec UID is not already known by CMMFController and there is ambiguity with the data path ie. there is more than one possible data path.

Allocates and constructs a data path according to the specified codec UID.

Use this function if the codec UID is already known by CMMFController and there is no data path ambiguity ie. only one data path is possible will create codec explicitly using the supplied codec Uid

Allocates and constructs a data path according to the specified codec UID.

Use this function if the codec UID is already known by CMMFController and there is ambiguity ie. more than one possible data path. TMediaId used to select the path.

Obtain source and/or sink buffer using the synchronous API CreateSourceBufferL() and CreateSinkBufferL() .

Pauses playing.

Sends KMMFErrorCategoryDataPathGeneralError to the client if an error occurs.

Starts an active scheduler 'play' loop.

Can only play from the primed state.

Gets the data path position.

Allocates buffers in preparation to play.

Must be called before calling PlayL() .

iSnkBufRef and iSrcBufRef contain ETrue if these buffers are created and owned by a MDataSource or MDataSink For clean-up purposes, datapath only cleans up buffers allocated directly by PrimeL() .

Deletes buffers if this datapath's sources and sinks own the buffers returned by PrimeL() . Typically if buffers are created asychronously, the datapath doesn't own the buffer so leaves cleanup handling to the owner sources/sinks.

Called when source and sink needs to be de-referenced. Sets iDataPathCreated, iSinkCanReceive, iSnkBufRef and iSrcBufRef to EFalse; sets iState to EStopped.

Handles errors coming from attached sources and passes them to the clients.

Runs the clip depending on the current data path and transfer state.

For example, fills the sink buffer if TDataPathState is EPlaying and TTransferState is ENeedSinkData.

Passes error handling and general messages to clients.

Sets the play window absolutely (i.e. the parameters are relative to the start of the entire clip).

Sets the data path position.

Gets the sink's data type for the specified media ID.

Gets the source data type for the specified media ID.

Returns the current data path state.

Stops playing.

Resets datapath position - currently does not clean up buffers. Sends KMMFErrorCategoryDataPathGeneralError to the client if an error occurs.

Indicates the state of the data path.

Mimics typical MultiMedia behaviour of stopped, primed and playing

This indicates what buffers are required in order to operate. If a real Codec is in use, buffers are required from both source and sink, else only one is required and source is preferred.

Indicates the transfer state.

Buffers maybe be filled, emptied, or have "one" shot initialisatings performed upon them.

TTransferState is used within the datapath RunL which drives databuffer exchange.

Indicates that all data has been sent to the sink.

Holds the outcome of the call to DetermineBuffersToUseL

This value can be used to obtain the duration of the source when playing or converting. This is an optimisation as this value will not change if we are playing or converting.

Codec in use. Null Codec is signified by == NULL

Result of processing the codec.

Pointer to internal callback completion class

The sink's position in terms of frames or some other time fixed parameter.

The source's position in terms of frames or some other time fixed parameter.

Datapath completed because of an error; usually KErrNone.

Set to ETrue when the data path has a source and a sink and can send data from the source to the sink.

The sink of data for which the CMMFDataPath is a MDataSource for

The source of data to which the CMMFDataPath is a MDataSink for.

Event handler.

Identifies which media type and stream within MDataSource .

Indicates that all data has been obtained from the source (ETrue if there is no more source data).

Indicates asynchrous buffers from AudioOutput.

Indicates asynchrous buffers from AudioInput.

Indicates DoPauseL() has been called.

End position of the play window.

Start position of the play window.

Holds the number of samples played on audio output at a point where we want to reference play duration from.

Holds the number of samples recorded from audio input at a point where we want to reference record duration from.

This is set to point to whichever sink buffer is in use.

Flag to indicate that a buffer is with the sink.

This are necessary as it is imperrative that when a buffer is with the sink, it must not be referenced in any way. The reason for this is that it is not mandated that sinks maintain buffer references. For example, it is valid for DevSound to request more audio data in a different buffer to the one supplied to it.

Set to true when the sink is able to accept data. EFalse otherwise.

The sink's data type. Same as the codec input data type.

ETrue if sink buffer is reference to object owned by someone else

This is the pointer to whichever source buffer is in use

Flag to indicate that a buffer is with the source.

This is necessary as it is imperrative that when a buffer is with the source, it must not be referenced in any way. The reason for this is that it is not mandated that sources maintain buffer references. For example, it is valid for DevSound to return recorded data in a different buffer to the one supplied to it.

The source's data type. Same as the codec output data type.

ETrue if the source buffer is reference to object owned by someone else.

The position audio will start playing from. When stopping, this is set to iPlayWindowStartPosition. When pausing, this is set to the current position.

Current data path state. TDataPathState

Current transfer state. TTransferState

Set to true if data path has to use a supplied codec in its construction.