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The Multimedia Tuner component (Radio Data System capable tuner) provides the features to control the tuner hardware present on a device. For example, it can be used to scan for a specific radio station and play and record received audio signals.
The Multimedia Tuner component uses the following components:
Multimedia Framework controller plug-in for formats and audio data types.
Media Device Framework - DevSound; the interface to the audio processing hardware for playback and recording functionality (audio input and output).
Shown below is a representation of how the Tuner component interacts with the MMF Controller Framework and other components:
A tuner device converts antenna signals into analog audio and video signals and allows the user to select a specific broadcast channel, for example a radio station.
The Tuner API allows an application to access and control the tuner hardware present on the device. It allows you to:
create a Tuner utility object
(CMMTunerUtility
) through which Tuner functionality is
accessed
tune to or search for a radio station
play the audio signal received on a channel (for example from a tuned-in radio station)
record the audio signal received on a channel
access Radio Data System (RDS) data
call custom tuner functions.
CMMTunerUtility
is the key class which provides
the tuner utility functionality. There are a number of additional tuner utility
classes which provide enhanced tuner functionality that are accessed through
CMMTunerUtility
, such as:
To create an instance of these classes call the relevant factory
function. For example, call
CMMTunerUtility::GetTunerScannerUtilityL()
to obtain an
instance of CMMTunerScannerUtility
.
CMMTunerScannerUtility *scannerUtility =
pTunerUtility->GetTunerScannerUtilityL(iObserver);
where pTunerUtility
is an object of type
CMMTunerUtility
and iObserver
is a reference
to the MMMTunerObserver
object specified when
CMMTunerUtility
was created.
The following diagram shows the Tuner classes and their relationships.