Getting SIGSEGV When Trying to Play an mp3 in AVAudioPlayer Using Monotouch

Question

I am trying to play an mp3 file with the following code.

 AVAudioPlayer player = new AVAudioPlayer();
 NSUrl mediaFile = NSUrl.FromFilename(monkeySound);
 player = AVAudioPlayer.FromUrl(mediaFile);
 player.Delegate = new PlayerDelegate();
 if(player.PrepareToPlay()){
     player.Play();
 }

private class PlayerDelegate:AVAudioPlayerDelegate {

        public PlayerDelegate(){

        }

        public override void FinishedPlaying (AVAudioPlayer player, bool flag)
        {
            //Some Stuff Done Here               
        }
}

This is the error I get: Stacktrace:

at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging.void_objc_msgSend (intptr,intptr) at MonoTouch.Foundation.NSObject/MonoTouch_Disposer.Drain (MonoTouch.Foundation.NSObject) [0x0002a] in /Users/plasma/Source/iphone/monotouch/Foundation/NSObject.cs:305 at (wrapper runtime-invoke) .runtime_invoke_void_this__object (object,intptr,intptr,intptr) at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x00038] in /Users/plasma/Source/iphone/monotouch/UIKit/UIApplication.cs:26 at MonoTouch.UIKit.UIApplication.Main (string[]) [0x00000] in /Users/plasma/Source/iphone/monotouch/UIKit/UIApplication.cs:31 at MonkeyShot.Application.Main (string[]) [0x00000] in /Users/fencer04/Projects/MonkeyShot/MonkeyShot/Main.cs:14 at (wrapper runtime-invoke) .runtime_invoke_void_object (object,intptr,intptr,intptr)

Native stacktrace:

    0   MonkeyShot                          0x000d0d25 mono_handle_native_sigsegv + 343
    1   MonkeyShot                          0x0000f6f4 mono_sigsegv_signal_handler + 322
    2   libSystem.B.dylib                   0x992a345b _sigtramp + 43
    3   ???                                 0xffffffff 0x0 + 4294967295
    4   AVFoundation                        0x0047c28d -[AVAudioPlayer privCommonCleanup] + 50
    5   AVFoundation                        0x0047c339 -[AVAudioPlayer dealloc] + 51
    6   ???                                 0x0a2af91c 0x0 + 170588444
    7   ???                                 0x0a2cab1c 0x0 + 170699548
    8   ???                                 0x077520d6 0x0 + 125116630
    9   MonkeyShot                          0x0000f4af mono_jit_runtime_invoke + 1332
    10  MonkeyShot                          0x001ed319 mono_runtime_invoke + 137
    11  MonkeyShot                          0x0029da57 monotouch_trampoline + 2527
    12  Foundation                          0x0140d94e __NSThreadPerformPerform + 251
    13  CoreFoundation                      0x00e9f8ff __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
    14  CoreFoundation                      0x00dfd88b __CFRunLoopDoSources0 + 571
    15  CoreFoundation                      0x00dfcd86 __CFRunLoopRun + 470
    16  CoreFoundation                      0x00dfc840 CFRunLoopRunSpecific + 208
    17  CoreFoundation                      0x00dfc761 CFRunLoopRunInMode + 97
    18  GraphicsServices                    0x0404b1c4 GSEventRunModal + 217
    19  GraphicsServices                    0x0404b289 GSEventRun + 115
    20  UIKit                               0x01cdfc93 UIApplicationMain + 1160
    21  ???                                 0x09d530a3 0x0 + 164966563
    22  ???                                 0x09d52e74 0x0 + 164966004
    23  ???                                 0x09d52474 0x0 + 164963444
    24  ???                                 0x09d522cc 0x0 + 164963020
    25  ???                                 0x09d5241e 0x0 + 164963358
    26  MonkeyShot                          0x0000f4af mono_jit_runtime_invoke + 1332
    27  MonkeyShot                          0x001ed319 mono_runtime_invoke + 137
    28  MonkeyShot                          0x001efa00 mono_runtime_exec_main + 669
    29  MonkeyShot                          0x001eedea mono_runtime_run_main + 843
    30  MonkeyShot                          0x000a3083 mono_jit_exec + 200
    31  MonkeyShot                          0x002a1697 main + 3838
    32  MonkeyShot                          0x00002809 _start + 208
    33  MonkeyShot                          0x00002738 start + 40

Debug info from gdb:

/tmp/mono-gdb-commands.0GDVJY:1: Error in sourced command file: unable to debug self

=============================================================== Got a SIGSEGV while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries

used by your application.

Sean Sean · Accepted Answer · 2011-05-17T22:37:48

I don't know if this is your issue, but I had some issues using the C#-style delegate methods and AVAudioPlayer. If this is similar to my issue, using the "WeakDelegate" construct and exporting methods might be useful.

Getting SIGSEGV When Trying to Play an mp3 in AVAudioPlayer Using Monotouch

used by your application.

1 Answers