Re: AVAudioSession -- do I need it?
Re: AVAudioSession -- do I need it?
- Subject: Re: AVAudioSession -- do I need it?
- From: Kevin Dixon <email@hidden>
- Date: Mon, 21 Jan 2013 11:15:45 -0800
AVAudioSession is an Objective-C wrapper around the AudioSession* C
API. You definitely need to do things like set your app's category,
but the API does not matter.
If you are using the C API, then you must call
AudioSessionInitialize(...) before doing anything else. If you are
using AVAudioSession, retreiving the sharedInstance property does this
for you.
-Kevin
On Sat, Jan 19, 2013 at 1:52 PM, Adriano Goncalves
<email@hidden> wrote:
> Hi.
>
> I'm not an expert in CoreAudio as I'm working currently on my first iOS
> project using it. But my mixer input volumes work as expected and I'm
> setting AVAudioSession. In fact, I'm using the code provided by Apple in the
> MixerHost sample project. And in this MixerHost project, the input volume
> works as expected as well. So maybe it doesn't have to do with how you set
> the audio session.
>
> Your volume doesn't change but your can ear the sound from your input buses,
> is that right?
>
> Maybe you could post the code you are using to change the volume or how you
> configure the AUGraph. Then it could be easier to help you.
>
> Adriano
>
>
>
> On 19/01/2013, at 19:31, Bob Sabiston <email@hidden> wrote:
>
> Hello,
>
> I am still trying to track down why my mixer input volumes don't change.
> Someone suggested I look at the "iPhoneMultiChannelMixerTest" instead of
> "MixerHost", which I had been using as a reference.
>
> I notice that both projects use the AVFoundation framework. But "MixerHost"
> (and my own code) uses AVAudioSession, whereas "iPhoneMultiChannelMixerTest"
> does not. The latter uses code like this to set the category:
>
> UInt32 audioCategory = kAudioSessionCategory_AmbientSound;
>
> XThrowIfError(AudioSessionSetProperty(kAudioSessionProperty_AudioCategory,
> sizeof(audioCategory), &audioCategory), "couldn't set audio category");
>
>
> whereas the former uses something like this:
>
> AVAudioSession *mySession = [AVAudioSession sharedInstance];
> NSError *audioSessionError = nil;
> [mySession setCategory: AVAudioSessionCategoryAmbient
> error: &audioSessionError];
>
>
> I am just wondering what is the difference here? Should I not be using
> AVAudioSession? Why would someone choose one set of code over the other?
> Is one older?
>
> Thanks
> Bob
>
>
>
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