User guide

Your app can send different audio streams to different output routes. For example, your app could send one

audio stream to the left headphone, another audio stream to the right headphone, and a third audio stream

to the HDMI routes. Figure 2-1 shows an example of sending multiple files to different audio routes.

Figure 2-1 Sending different files to different audio routes

Depending on the device and any connected accessories, the following are valid output route combinations:

●

USB and headphones

●

HDMI and headphones

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LineOut and headphones

The multiroute category supports the use of a single input port.

Setting Your Audio Session Category

For most iOS apps, setting your audio session category at launch—and never changing it—works well. This

provides the best user experience because the device’s audio behavior remains consistent as your app runs.

Working with Categories

Setting Your Audio Session Category