ios5 - Different result when processing Audio Interrupt for audio unit -

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i have searched related posts here , apple documents, without answers. apple's sample code "auriotouch", have handler this:

static void riointerruptionlistener(void *inclientdata, uint32 ininterruption) {     printf("session interrupted! --- %s ---",              ininterruption == kaudiosessionbegininterruption ?              "begin interruption" : "end interruption");      audioobjectimpl *this = (__bridge audioobjectimpl *)inclientdata;      if (ininterruption == kaudiosessionendinterruption) {        // make sure again active session         xthrowiferror(audiosessionsetactive(true), "couldn't set audio session active");         xthrowiferror(audiooutputunitstart(this->riounit), "couldn't start unit");         this->ininterrupt = false;     }      if (ininterruption == kaudiosessionbegininterruption) {         xthrowiferror(audiooutputunitstop(this->riounit), "couldn't stop unit");         this->unitisrunning = false;         this->ininterrupt = true;     } }

audioobjectimpl owner of audio unit. xthrowiferror(action, message) macro execute 'action', , if catches exception, print 'message'. copied auriotouch sample code.

this code did work incoming call interrupt, rejecting call, interrupted audio restored. crashed when choose ring tone in "settings|general|sound|ring" .

the crash point @ ...audiosessionsetactive(true)..., why different these 2 cases? , how can works in both cases ?


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