How Do I Route Audio to Speaker without using AudioSessionSetProperty? - ios

Question

As AudioSessionSetProperty may become deprecated, I'm trying to find an code example of how to route audio to the speaker using other means.
Previously I did the following:
-(void)setSpeakerEnabled
{
debugLog(#"%s",__FUNCTION__);
UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
AudioSessionSetProperty (
kAudioSessionProperty_OverrideAudioRoute,
sizeof (audioRouteOverride),
&audioRouteOverride
);
}
Trying to get same result but without call to AudioSessionSetProperty.

Answer 1

On each release of iOS, more of the audioSession properties are migrated to AVFoundation, so you should use those in preference whenever available.
Since iOS 6 kAudioSessionProperty_OverrideAudioRoute is represented in AVAudioSession by the method
- (BOOL)overrideOutputAudioPort:error:
Available values are AVAudioSessionPortOverrideNone and AVAudioSessionPortOverrideSpeaker
Here is an example audio session configured entirely via AVFoundation:
- (void)configureAVAudioSession
{
// Get your app's audioSession singleton object
AVAudioSession *session = [AVAudioSession sharedInstance];
// Error handling
BOOL success;
NSError *error;
// set the audioSession category.
// Needs to be Record or PlayAndRecord to use audioRouteOverride:
success = [session setCategory:AVAudioSessionCategoryPlayAndRecord
error:&error];
if (!success) {
NSLog(#"AVAudioSession error setting category:%#",error);
}
// Set the audioSession override
success = [session overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker
error:&error];
if (!success) {
NSLog(#"AVAudioSession error overrideOutputAudioPort:%#",error);
}
// Activate the audio session
success = [session setActive:YES error:&error];
if (!success) {
NSLog(#"AVAudioSession error activating: %#",error);
}
else {
NSLog(#"AudioSession active");
}
}
UPDATE
Since iOS 7.0, the Audio Session Services C API is now fully deprecated in favour of AVAudioSession.
UPDATE 2
- (BOOL)overrideOutputAudioPort:error:
is a method, not a property, and it sets an underlying write-only UInt32 value. You can't get the current value, and you should treat the method as setting a temporary state. If the audio route changes or is interrupted, the property resets to its default (AVAudioSessionPortOverrideNone). You can get interruption notifications via AVAudioSessionDelegate.

Answer 2

NSError *error;
[[AVAudioSession sharedInstance] overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker
error:&error];
if(error)
{
NSLog(#"Error: AudioSession cannot use speakers");
}

Answer 3

let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSession.Category.playAndRecord, mode: .spokenAudio, options: .defaultToSpeaker)
try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
} catch {
print("error.")
}
// paste this code in your viewLoad region

Answer 4

Foundry’s solution together with this blog by Mario Diana has also allowed me to upgrade audio session set up code deprecated in iOS 7. My old code was based on
AudioBufferPlayer by Matthijs Hollemans.
Remember to add the AVFoundation.framework.