Re: iPhone - RenderCallback not called when phone is locked
Re: iPhone - RenderCallback not called when phone is locked
- Subject: Re: iPhone - RenderCallback not called when phone is locked
- From: William Stewart <email@hidden>
- Date: Tue, 17 Nov 2009 14:33:45 -0800
Hi John
So, we've tried to reproduce this problem with oalTouch (that uses
open al which uses the AURIO) - we just set the category to media
playback and it works fine.
Are you playing some other sound - maybe through the itunes music
library or a movie or something. Can you log your interruption calls -
see if you are getting interrupted somehow and maybe get the current
category (it shouldn't change, but I don't know what the problem is...)
On Nov 16, 2009, at 5:46 PM, John Morris wrote:
Well, I'm doing this at app startup:
AudioSessionInitialize(NULL, kCFRunLoopDefaultMode,
sessionInterrupted, this);
UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof
(UInt32), &sessionCategory);
AudioSessionSetActive(true);
None of these return any errors. And I can use
AudioSessionGetProperty() to check the category and it returns
kAudioSessionCategory_MediaPlayback.
The only other time I touch the session is in my
AudioSessionInterruptionListener:
void zmBoomBox::sessionInterrupted(void *inClientData, UInt32
inInterruptionState) {
zmBoomBox *_this = (zmBoomBox*)inClientData;
switch(inInterruptionState) {
case kAudioSessionBeginInterruption:
AudioOutputUnitStop(_this->zm_output);
AudioSessionSetActive(false);
break;
case kAudioSessionEndInterruption:
AudioSessionSetActive(true);
AudioOutputUnitStart(_this->zm_output);
break;
}
}
Is this not correct?
Thanks,
John Morris
Evolution Interactive
On Nov 16, 2009, at 5:18 PM, William Stewart wrote:
that sounds (sorry about the pun!) like your session's category is
not being established correctly. Are you setting your category
before making yourself active, and never changing it (just to be
sure)...
On Nov 16, 2009, at 5:06 PM, John Morris wrote:
I'm having a bit of a problem with getting music to continue
playing when the screen is locked.
I am using RemoteIO with a MultiChannelMixer sitting on top of it
in an AUGraph. I am using the kAudioSessionCategory_MediaPlayback
session category and am pretty sure I am properly activating/
deactivating the session. Everything works just fine except for
when I hit the sleep/lock button. When I do this, the render
callback stops being called and the device (iPhone & iPod Touch)
continues to play the last filled buffer repeatedly. If I hit the
home button to get to the "slide to unlock" screen, the music
comes back on (calling the callback is resumed). If I let that
screen timeout and go back to black, then the callback will stop
again. If I unlock the device, everything resumes just fine.
Any ideas?
John Morris
Evolution Interactive
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