MAudioStreamObserver Class Reference
| class MAudioStreamObserver |
An interface to a set of AudioStream callback functions.
this serves as the method of communication between the client and the AudioStream.
The class is a mixin and is intended to be inherited by the client class that is interested in observing the AudioStream operation. The functions encapsulated by this class are called when specific events occur while processing audio.
Member Functions Documentation
AddProcessingUnitComplete(MAudioStream &, MAudioProcessingUnit *, TInt)
Notifies that adding of processing unit to the stream has been completed successfully or otherwise.
if the processing unit is added succesfully, then it must be removed from the stream before the processing unit is removed from the context or before the stream is removed.
Parameters
| MAudioStream & aStream | A reference to the stream to which the processing unit was added. |
| MAudioProcessingUnit * aInstance | a pointer to the processing unit instance. |
| TInt aError | an error code. KErrNone on success. Otherwise one of the system wide error codes. |
FlushComplete(MAudioStream &, TInt)
Signals completion of a Flush() operation.
Parameters
| MAudioStream & aStream | A reference to the stream on which Flush() was called. |
| TInt aError | an error code. KErrAbort if the associated stream has been unloaded, and the buffers cease to exist. |
ProcessingFinished(MAudioStream &)
Call-back indicating that is the last buffer has been processed by the sink.
RemoveProcessingUnitComplete(MAudioStream &, MAudioProcessingUnit *, TInt)
Notifies that removing of processing unit from the stream has been completed successfully or otherwise.
if the processing unit has been added succesfully, then it must be removed from the stream, before the processing unit is removed from the context or before the stream is removed.
Parameters
| MAudioStream & aStream | A reference to the stream from which the processing unit has been removed. |
| MAudioProcessingUnit * aInstance | a pointer to the processing unit instance. |
| TInt aError | an error code. KErrNone on success. Otherwise one of the system wide error codes. |
StateEvent(MAudioStream &, TInt, TAudioState)
Handles audio stream state change event.
Parameters
| MAudioStream & aStream | A reference to the stream whose state changed. |
| TInt aReason | A set of values describing why the state change occurred corresponding to the system-wide error codes. The value will be KErrNone on successful calls. |
| TAudioState aNewState | indicating the state in which the audio stream has changed. |
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