播放avaudioplayer经常导致SIGSEGV

本文关键字：SIGSEGV 常导致 avaudioplayer 播放 | 更新日期: 2023-09-27 17:50:58

我正在Xamarin Studio开发一款iOS游戏，却遇到了崩溃&;SIGSEGV 。我正在使用AVAudioPlayer播放音效。基本上，我给了一个士兵一种非常非常快的射击能力!在对这种能力进行压力测试时，我遇到了SIGSEGV。我可以在我的项目中成功地复制它。基本上，如果我注释掉所有音效，崩溃就不会发生。如果我让音效播放，崩溃就会发生。

我的项目崩溃了，只给我这个 

2014-03-19 18:03:08.304 CyCom[5666:131a3] 18:03:08.303 ERROR:     >aqsrv> 65: Exception caught in (null) - error -66634
mono-rt: Stacktrace:

mono-rt:   at <unknown> <0xffffffff>
mono-rt:   at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <IL 0x0009f, 0xffffffff>
mono-rt:   at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
mono-rt:   at CyCom.Application.Main (string[]) [0x00012] in /Users/jzacherl/Projects/CyCom/CyCom/CyCom/Main.cs:20
mono-rt:   at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>
mono-rt: 
Native stacktrace:

mono-rt: 
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.
重要的是要注意，这种崩溃只发生在iOS模拟器上。我无法在iPad设备上重现这种崩溃。这可能是线程计时或垃圾收集，但我只是猜测。

我尝试在位于这里的单独项目中复制此，但未成功。我不能让这个崩溃与相同/类似的信息。很明显，我的主要项目和这个测试项目之间有很大的不同(可能是为什么我不能在测试项目中重现它)，但我忍不住要动摇这种感觉，即播放声音效果太多/太快导致了这种情况。

这是我演示这个崩溃的视频。在这个视频中，我演示了打开声音，当我发送声音效果时，我最终会因为这个错误而崩溃。然后，我演示了关闭声音效果后，我不会因为这个错误而崩溃。

这里是我的一个播放声音函数的代码片段，以及[a file containing lots of them][3] 

    public static AVAudioPlayer GetNextAudioPlayer_General( )
    {
        // The UIApplicationDelegate for the application.
        AppDelegate appDel = (AppDelegate)UIApplication.SharedApplication.Delegate;
        // The first thing I need to do is take ownership of the next player in the SoundEffectPlayerList.  To do this, simply increment the index so no other thread can have this player.  
        // If this thread is grabbing index 7, and inc the endex, the next thread that trys to access it will get 8...  That's why I inc the index ahead of time rather than after....  It's a multi threading bug prevention thing
        AVAudioPlayer player = null;
        lock(appDel.CyCom.battlefield.SoundEffectPlayerList_General)
        {
            player = appDel.CyCom.battlefield.SoundEffectPlayerList_General[appDel.CyCom.battlefield.SoundEffectPlayerList_General_Index];
            // Inc the index
            appDel.CyCom.battlefield.SoundEffectPlayerList_General_Index++;
            if ( appDel.CyCom.battlefield.SoundEffectPlayerList_General_Index >= appDel.CyCom.battlefield.SoundEffectPlayerList_General.Count )
            {
                appDel.CyCom.battlefield.SoundEffectPlayerList_General_Index = 0;
            }
        }
        return player;
    }

    public static void PlaySoundEffect_FireWeapon ( MySoldier soldier )
    {
        AppDelegate appDel = (AppDelegate)UIApplication.SharedApplication.Delegate;
        // If Audio is enabled and the gamespeed is within limits
        if ( appDel.globals.AudioEnabled && appDel.CyCom.GameSpeed <= appDel.globals.Audio_MaxGameSpeedThatAllowsAudioToPlay )
        {
            // Play Weapon Fire Audio
            AVAudioPlayer audioPlayer = Library_Sounds.GetNextAudioPlayer_General();
            // Set up the Audio Player with the sound effect to be played
            if ( soldier.Attributes.Weapon.WeaponType == appDel.globals.SoldierModelWeaponType_Rifle )
            {
                audioPlayer = AVAudioPlayer.FromData(appDel.CyCom.SoundEffects.MediaFile_SoundEffects_M4_Fire);
            }
            else if ( soldier.Attributes.Weapon.WeaponType == appDel.globals.SoldierModelWeaponType_WarheadLauncher )
            {
                audioPlayer = AVAudioPlayer.FromData(appDel.CyCom.SoundEffects.MediaFile_SoundEffects_Rocket_Launch_01);
            }
            // Set the volume
            audioPlayer.Volume = soldier.PlayerVolume;
            audioPlayer.Play();
        }
    }

关于Rolf的评论:这里是Mac控制台应用程序

的ASI文件链接

关于Rolf的评论:这是.crash文件

关于Choper的评论:我替换了每个Player.Play();使用以下代码:

PlayThisAudioPlayer(player);

函数如下:

public static void PlayThisAudioPlayer( AVAudioPlayer player )
    {
        AppDelegate appDel = (AppDelegate)UIApplication.SharedApplication.Delegate;
        player.FinishedPlaying += CreateFinishedPlayingEvent(player);
        player.Play();
    }

    public static EventHandler<AVStatusEventArgs> CreateFinishedPlayingEvent ( AVAudioPlayer player )
    {
        EventHandler<AVStatusEventArgs> finishedPlayingEvent;
        finishedPlayingEvent = delegate(object sender, AVStatusEventArgs e) {
            player.Stop();
            player.FinishedPlaying -= finishedPlayingEvent;
            player.Dispose();
            player = null;
        };
        return finishedPlayingEvent;
    }

我现在遇到这个崩溃:

2014-03-20 11:09:37.568 CyCom[5533:a0b] EXCEPTION IN THE MAIN.CS
2014-03-20 11:09:37.569 CyCom[5533:a0b] the player object was Dispose()d during the callback, this has corrupted the state of the program
2014-03-20 11:09:37.569 CyCom[5533:a0b]   at MonoTouch.AVFoundation.InternalAVAudioPlayerDelegate.FinishedPlaying (MonoTouch.AVFoundation.AVAudioPlayer player, Boolean flag) [0x00032] in /Developer/MonoTouch/Source/maccore/src/AVFoundation/Events.cs:72 
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38 
at CyCom.Application.Main (System.String[] args) [0x00013] in /Users/jzacherl/Projects/CyCom/CyCom/CyCom/Main.cs:23

附加虽然:我认为问题可能是我使用静态函数....试着证明这是真的还是假的。

我给了Choper这里的复选标记，因为问题最终是我重用avaudioplayer，而不是处理它们。无论出于何种原因，您都不能长时间连续重复使用avaudioplayer。我不知道为什么，但事实证明这是不好的!我重新设计了我的代码，这样AVAudio播放器是在需要的时候创建的，然后由后台线程处理。

播放avaudioplayer经常导致SIGSEGV

添加到您的代码中:

audioPlayer.FinishedPlaying += HandleAudioFinished;
...
private void HandleAudioFinished (object sender, AVStatusEventArgs e) 
{
    if (audioPlayer != null)
    {
        audioPlayer.Stop();
        audioPlayer.FinishedPlaying -= HandleAudioFinished;
        audioPlayer.Dispose();
        audioPlayer = null;
    }
}
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