Instance Property


The currently selected input data source.


@property(readonly) AVAudioSessionDataSourceDescription *inputDataSource;


The value of this property is nil if switching between multiple input sources is not currently possible. This feature is supported only on certain devices and peripherals–for example, on an iPhone equipped with both front- and rear-facing microphones.

See Also

Working with Audio Routes


An object describing the current audio input and output route.


A Boolean value indicating whether an audio input path is available.


An array of input ports available for routing.


The preferred input port for audio routing.

- setPreferredInput:error:

Sets the preferred input port for audio routing.


An array of available data sources for the audio session’s current input port.

- setInputDataSource:error:

Selects a data source for the audio session’s current input port.


An array of available output data sources for the current audio route.


The currently selected output data source.

- setOutputDataSource:error:

Sets the output data source for an audio session.

- overrideOutputAudioPort:error:

Temporarily changes the current audio route.


The current routing policy.

- setCategory:mode:routeSharingPolicy:options:error:

Sets the session category, mode, route sharing policy, and options.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software