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POWhy does AudioServicesCreateSystemSoundID throw an exception internally but return 0 as an error code?
 

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  1. POWhy does AudioServicesCreateSystemSoundID throw an exception internally but return 0 as an error code?
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    <p>I’m running an iOS program in the 4.3.2, 5.0, and 5.1 Simulators, and I’m hitting a weird internal exception in AudioToolbox. I have a breakpoint set in Xcode (Xcode 4.3.1, running on 10.7.3) for all exceptions, and the debugger is breaking during a call to <code>AudioServicesCreateSystemSoundID()</code>:</p> <pre><code>SystemSoundID soundID; OSStatus errorCode = AudioServicesCreateSystemSoundID(soundFileURLRef, &amp;soundID); // ^ boom. ^ </code></pre> <p>The backtrace:</p> <pre><code>(lldb) bt * thread #1: tid = 0x1f03, 0x9000e230 libc++abi.dylib`__cxa_throw, stop reason = breakpoint 1.2 frame #0: 0x9000e230 libc++abi.dylib`__cxa_throw frame #1: 0x00144193 AudioToolbox`ID3ParserHandle::ID3ParserHandle(void*, long (*)(void*, unsigned long, unsigned long, unsigned long, void**, unsigned long*)) + 259 frame #2: 0x001442de AudioToolbox`ID3ParserOpen + 62 frame #3: 0x0006c0e7 AudioToolbox`MPEGAudioFile::ParseID3Tags() + 87 frame #4: 0x0006c2ba AudioToolbox`MPEGAudioFile::ParseAudioFile() + 26 frame #5: 0x00015153 AudioToolbox`AudioFileOpenWithCallbacks + 371 frame #6: 0x00027020 AudioToolbox`_ZL15VerifyAndMapURLPK7__CFURLRx + 448 frame #7: 0x00026d85 AudioToolbox`_ZL18ActionDataToServerPK7__CFURLm + 933 frame #8: 0x000da26b AudioToolbox`AudioServicesCreateSystemSoundID + 235 frame #9: 0x00005be1 app`-[SoundsViewController playSoundForPath:] + 257 at SoundsViewController.m:161 frame #10: 0x00005a99 app`-[SoundsViewController tableView:didSelectRowAtIndexPath:] + 777 at SoundsViewController.m:129 frame #11: 0x0029db68 UIKit`-[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1140 frame #12: 0x00293b05 UIKit`-[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 219 frame #13: 0x009ad79e Foundation`__NSFireDelayedPerform + 441 frame #14: 0x00fb58c3 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 19 frame #15: 0x00fb6e74 CoreFoundation`__CFRunLoopDoTimer + 1220 frame #16: 0x00f132c9 CoreFoundation`__CFRunLoopRun + 1817 frame #17: 0x00f12840 CoreFoundation`CFRunLoopRunSpecific + 208 frame #18: 0x00f12761 CoreFoundation`CFRunLoopRunInMode + 97 frame #19: 0x01f6b1c4 GraphicsServices`GSEventRunModal + 217 frame #20: 0x01f6b289 GraphicsServices`GSEventRun + 115 frame #21: 0x00234c93 UIKit`UIApplicationMain + 1160 frame #22: 0x00002c45 app`main + 181 at main.m:14 </code></pre> <p>However, the audio file in <code>soundID</code> is created successfully, and the OSStatus error code that <code>AudioServicesCreateSystemSoundID</code> returns is 0.</p> <p>This happens in all three iOS Simulator versions I have installed, and on my iPhone running 5.1.</p> <p>This looks to be the same general backtrace as <a href="https://stackoverflow.com/questions/9683547/avaudioplayer-throws-breakpoint-in-debug-mode">AVAudioPlayer throws breakpoint in debug mode</a> , though mine is the result of a more direct invocation of AudioToolbox.</p> <p>I want to file this with Apple, since it’s a bug in AudioToolbox (frameworks shouldn’t use exceptions for flow control, per bbum and others), but before I do, I’m wondering what other info I can gather to give them, and if there’s any way to avoid this throw (maybe by tweaking ID3 tags in this mp3?)</p>
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    1. COI get an exception thrown in AudioToolbox's ExtAudioFileSetProperty method as well. I've not found a way to avoid the exceptions, unfortunately.
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    2. COYeah, it looks like they’re just using a ton of exceptions internally for control flow. The best solution is to not manually add all exception throws as a breakpoint, and instead use its “Exception Breakpoint” breakpoint.
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