Tuner overview

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.

Key Classes

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:

• CMMTunerScannerUtility

• CMMTunerAudioPlayerUtility

• CMMTunerAudioRecorderUtility

• CMMRdsTunerUtility.

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.

• How to use the Tuner API

• Multi Media Framework Client Overview