AVAudioSession setCategory error example in Objective C (iOS).

AVAudioSession setCategory error

Sets the audio session category.

- (BOOL)setCategory:(NSString *)theCategory error:(NSError **)outError

Parameters
theCategory
The audio session category you want to apply to the audio session. See “Audio Session Categories.”
outError
On input, specify a pointer to an error object. If an error occurs, the pointer is set to an NSError object that describes the error. If you do not want error information, pass in nil.

Return Value of [AVAudioSession setCategory error]
Returns YES on success or NO on failure.

AVAudioSession setCategory error example.

if (!hasInitialisedAudioSession) {
    AVAudioSession *session = [AVAudioSession sharedInstance];
    [session setCategory:AVAudioSessionCategoryAmbient error:NULL];

    [session setActive:YES error:NULL];

    hasInitialisedAudioSession = YES;
}

Example of [AVAudioSession setCategory error].

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&sessionError];
NSError * audio_session_err = nil;
[audio_session setCategory: AVAudioSessionCategoryPlayAndRecord error:&audio_session_err];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:&audio_session_err];
[[AVAudioSession sharedInstance] setDelegate:self];
NSLog(@"!");

UInt32 audioRouteOverride = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker,sizeof (audioRouteOverride),&audioRouteOverride);
UInt32 allowMixing = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryMixWithOthers, sizeof(allowMixing), &allowMixing);   

if (audio_session_err) {
  NSLog(@"audioSession: %@ %d %@", [audio_session_err domain], [audio_session_err code], [audio_session_err description]);
} else {
  audio_session_err = nil;
  [[AVAudioSession sharedInstance] setActive:YES error:&audio_session_err];
  if (!audio_session_err) NSLog(@"audio session is activated successfully");
}

AVAudioSession setCategory error example.

// Set AudioSession
NSError *sessionError = nil;
[[AVAudioSession sharedInstance] setDelegate:self];
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];

/* Pick any one of them */
// 1. Overriding the output audio route
//UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;
//AudioSessionSetProperty(kAudioSessionProperty_OverrideAudioRoute, sizeof(audioRouteOverride), &audioRouteOverride);

// 2. Changing the default output audio route
UInt32 doChangeDefaultRoute = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker, sizeof(doChangeDefaultRoute), &doChangeDefaultRoute);

End of AVAudioSession setCategory error example article.