User guide

Contents

Introduction 6

At a Glance 7

An Audio Session Encapsulates a Set of Behaviors 7

Categories Express Audio Roles 7

Modes Customize Categories 7

Notifications Support Interruption Handling 8

Notifications Support Audio Route Change Handling 8

Categories Support Advanced Features 8

Prerequisites 9

See Also 9

Defining an Audio Session 10

Audio Session Default Behavior 10

Why a Default Audio Session Usually Isn’t What You Want 11

How the System Resolves Competing Audio Demands 12

Incorporating an AVCaptureSession 14

Initializing Your Audio Session 14

Adding Volume and Route Control 15

Responding to Remote Control Events 15

Activating and Deactivating Your Audio Session 15

Checking Whether Other Audio Is Playing During App Launch 16

Working with Inter-App Audio 17

Working with Categories 18

Choosing the Best Category 18

Expanding Options Using the Multiroute Category 20

Setting Your Audio Session Category 21

Using Modes to Specialize the Category 22

Choosing Categories and Modes for AirPlay 23

Fine-Tuning a Category 24

Recording Permission 25

Responding to Interruptions 26

Audio Interruption Handling Techniques 26