User guide

●

Ask the user for permission to record input using the requestRecordPermission: method. Don’t rely

on the iOS to prompt the user.

Audio Guidelines for Metering Apps

Metering apps want the minimal amount of system-supplied signal processing applied to the input and output

routes. Set the AVAudioSessionCategoryPlayAndRecord category and the measurement mode to minimize

signal processing. Also, apps of this type will not mix with other apps.

Apple recommends the following guidelines:

●

Always attempt to reactivate and resume playback after an end interruption event.

●

Ignore all route changes unless the app specifically needs to pay attention to them.

●

Set the audio category before displaying a video splash on app launch.

●

Ask the user for permission to record input using the requestRecordPermission: method. Don’t rely

on the iOS to prompt the user.

Audio Guidelines for Browser-like Apps That Sometimes Play Audio

Apps like Facebook and Instagram don’t record audio, only playback audio and video. They use the

AVAudioSessionCategoryPlayback category and do not obey the ringer switch. These apps also do not

mix with other apps.

Apple recommends the following guidelines:

●

Always wait for the user to initiate playback.

●

Deactivate the audio session after video ends and set the

AVAudioSessionSetActiveFlags_NotifyOthersOnDeactivation key.

●

Pause the audio session due to a route change caused by an unplug event, but keep the audio session

active.

●

Update the UI when the app receives a begin interruption event.

●

Wait for the user to initiate playback after receiving an end interruption event.

Audio Guidelines By App Type

Audio Guidelines for Metering Apps