使用视频/摄像机时未触发AVAudioSessionInterruptionNotification [英] AVAudioSessionInterruptionNotification not fired when Video/Camera is used

问题描述

我有一些SIP应用程序.直到我只使用音频，evrything才能正常工作之前，在必要时我会收到AVAudioSessionInterruptionNotification.

I have some SIP application. Until I've used audio only evrything was working correctly, I was receiving AVAudioSessionInterruptionNotification when it was necessary.

使用视频时(接收和发送摄像机供稿)出现问题.一旦我将会话与视频一起使用，就不会再触发通知，即使仅使用以后的音频也是如此.

Problem appeared when video was used (receiving and sending camera feed). Once I use session with video, notification is never fired again, even if later audio is used only.

我该如何解决?我发现了类似的主题，但是答案只是提示，我还没有完全理解.另外，我没有相机/捕获设备"和"AVCaptureSession"，因为音频和视频流是由封闭的第三方库提供的，但是我的代码必须处理中断.

How can I fix that? I've found similar topic, but answer is to prompt and I don't fully get it. Also I do not have "camera/capture device" and "AVCaptureSession" since audio and video streaming is provided by closed third party library, but my code have to handle interruptions.

是否必须更改某些属性以使此通知始终被触发(建议链接的主题)，还是应该使用替代通知.
我正在研究文档，但是找不到任何对我有用的东西.

Do I have to change some property to have this notification always fired (linked topic suggest that), or should I use alternative notification.
I was digging in documentation but I've failed to find anything useful for me.

我尝试使用AVCaptureSession的虚拟对象，但这不能解决问题.

I've tried use dummy object of AVCaptureSession, but this didn't solve the problem.

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编辑:第三方库因使用AVCAptureSession而导致崩溃.我已经联系他们，要求更改属性usesApplicationAudioSession，如其他问题所述，并乞求"他们修复此问题.经过长时间的战斗，他们同意:).

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Third party library had some additional crashed what exposed that they use AVCAptureSession. I've have contact them ask to change property usesApplicationAudioSession as described in other question and "beg" them to fix it. After longer fight they agreed :).

推荐答案

我使用了类别，并且

I used category and method swizzling and it works like charm.

#import "AVCaptureSession+MethodSwizzling.h"
#import <objc/runtime.h>


static void MethodSwizzle(Class c, SEL origSEL, SEL overrideSEL) {
  Method origMethod = class_getInstanceMethod(c, origSEL);
  Method overrideMethod = class_getInstanceMethod(c, overrideSEL);
  if(class_addMethod(c, origSEL, method_getImplementation(overrideMethod), method_getTypeEncoding(overrideMethod))) {
    class_replaceMethod(c, overrideSEL, method_getImplementation(origMethod), method_getTypeEncoding(origMethod));
  } else {
    method_exchangeImplementations(origMethod, overrideMethod);
  }
}

@implementation AVCaptureSession (MethodSwizzling)

- (id)initMethodSwizzling {
  self = [self initMethodSwizzling]; // it is not recursion it is method swizzling
  self.usesApplicationAudioSession = NO;
  return self;
}

+ (void)load {
  if (class_getInstanceMethod(self, @selector(setUsesApplicationAudioSession:))) {
    // Swizzle methods only when it is possible to change usesApplicationAudioSession property.
    MethodSwizzle(self, @selector(init), @selector(initMethodSwizzling));
  }
}

@end

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