Re: Internal Speaker stop work when i plug out the Headphones from audio jack
Re: Internal Speaker stop work when i plug out the Headphones from audio jack
- Subject: Re: Internal Speaker stop work when i plug out the Headphones from audio jack
- From: Tim Hewett <email@hidden>
- Date: Fri, 12 Apr 2013 13:32:14 +0100
Zhaofeng,
I am not aware of an API, my recollection is that the situation occurs if the device driver receives float samples larger than 1.0. I can't answer whether the behaviour is implemented in the driver or the hardware itself.
Tim.
On 12 Apr 2013, at 02:57, Zhaofeng Jia <email@hidden> wrote:
> Hi, Tim
>
> Thanks for your reply!
>
> Do you know how to remove this kind of protection from the Application ?
>
> thanks!
> zhaofeng
>
> 2013/4/12 Tim Hewett <email@hidden>
> I have seen/heard this on a MacBook Pro as well, it seems to be to protect the speakers from excessive volume or clipping. Occasionally I have noticed it fall back to mono through the "subwoofer" which is also in there apparently (within the constraints of the available space).
>
> I've not witnessed the headphone or optical output behave in the same way. It isn't always necessary for the protection to kick in after having disconnected the headphones.
>
> Tim.
>
>
> On 11 Apr 2013, at 18:42, email@hidden wrote:
>
> > Hi all,
> >
> > I'm developing a audio application on MacOS, and the application will use
> > CoreAuio to play audio data. The sound is good at the beginning, But when i
> > plug out he Headphones from jack, there will be a flap sound from the
> > internal speaker, and can't hear anything from the internal speaker after
> > this. But if i tune this speaker's volume or mute unmute this speaker from
> > the system preferences, my application's sound come again.
> >
> > This issue just will happen on MacBook Pro installed MacOS10.8.
> >
> > I just want to know what happended or how to fix this issue in my
> > application?
> >
> > Thanks in advance.
> > -zhaofeng
>
>
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