Re: AudioDeviceIOProc not called after AudioDeviceStart
Re: AudioDeviceIOProc not called after AudioDeviceStart
- Subject: Re: AudioDeviceIOProc not called after AudioDeviceStart
- From: Alain Mazy <email@hidden>
- Date: Thu, 01 Apr 2004 22:56:34 +0200
Le 4/1/04 9:49 PM, + Jeff Moore ; <email@hidden> a icrit :
>
That's not enough information to know what might be going astray in
>
your app. That sequence of calls by itself works fine if I paste them
>
into a command line tool. This will probably sound like a stupid
Yes, I'm sure the sequence of calls is correct because it works fine in some
condition. I just wonder what kind of side effect could cause the IOProc
not to be called.
>
question, but how are you judging whether or not your IOProc is getting
>
called?
By putting a print statement the first time it is called or by setting a
breakpoint and because I don't hear anything !
Thanks for your help.
Alain Mazy
>
>
On Apr 1, 2004, at 6:07 AM, Alain Mazy wrote:
>
>
> Here is a piece of code I have to start an audio device (input).
>
>
>
> err = AudioDeviceAddPropertyListener(fInputDevice->mID, 0, TRUE,
>
> kAudioDevicePropertyDeviceIsRunning, AudioDeviceIsRunningListenerProc,
>
> NULL);
>
> err = AudioDeviceAddIOProc(fInputDevice->mID,
>
> AudioDeviceSourceInputIOProc, self);
>
> err = AudioDeviceStart(fInputDevice->mID,
>
> AudioDeviceSourceInputIOProc);
>
>
>
> The PropertyListener callback is called and tells me the device is
>
> running
>
> but the AudioDeviceIOProc is never called. I get no error message.
>
>
>
> Actually, this piece of code sometimes work and sometimes not. It
>
> depends
>
> on what the user has done before. However, the failure/success of
>
> this code
>
> does not depend on the creation code or startup code for the
>
> AudioDevice
>
> which is always the same.
>
>
>
> An here comes the 'funniest' part: if I put a breakpoint on the first
>
> line
>
> and then execute the code step by step it ALWAYS work !
>
>
>
> So what's the problem ? Timing ? Multi-thread related ? How should I
>
> know
>
> since the API tells me that everything is fine ?
>
>
>
> Thanks a lot for your help.
>
>
>
> Alain.
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