User guide

You tell iOS your app’s audio intentions by designating a category for your audio session. Table B-1 provides

details on each of the categories. The default category, AVAudioSessionCategorySoloAmbient, is shaded.

For an explanation of how categories work, see Working with Categories (page 18). For an explanation of the

mixing override switch, see Choosing the Best Category (page 18).

Table B-1 Audio session category behavior

Allows audio

input

(recording) and

output

(playback)

Interrupts

non-mixable

apps audio

Silenced by

the

Ring/Silent

switch and

by screen

locking

see

note

Category identifiers

Output onlyNoYesAVAudioSessionCategoryAmbient

No input and

no output

Yes–AVAudioSessionCategoryAudio-

Processing

Input and

output

YesNoAVAudioSessionCategoryMultiRoute

Input and

output

Yes by default;

no by using

override

switch

NoAVAudioSessionCategoryPlayAnd-

Record

Output onlyYes by default;

no by using

override

switch

NoAVAudioSessionCategoryPlayback

Audio Session Categories and Modes