接到来电时，录制的视频已损坏，并且 AVFoundation 方法出现错误
我有一个视频录制应用程序。一切正常。录音时接到电话的情况除外。
当接到电话时，我尝试结束录音，但是，任何写入 AVAssetWriter 的调用都被拒绝。 audioWriterInput appendSampleBuffer 返回 no，appendPixelBuffer 出错。我尝试调用 avAssetWriter finishWriting 但返回 AVAssetWriterStatusFailed。
什么都不起作用，我的视频已损坏，因为一旦接到电话，我完成录制会话的常用方法似乎就不允许了。
当接到电话时，我可以听什么才能正确结束录音会话？我目前唯一能做的就是监听 applicationWillResignActive 并停止一切，但这会阻止在用户收到短信等时进行录制，这将使我的应用程序的工作方式与本机相机应用程序不同。
I have a video recording app. Everything works fine. Except when a phone call is received while recording.
When a phone call is received, I try to end the recording, however, any of my calls to write to an AVAssetWriter are denied. audioWriterInput appendSampleBuffer returns no, appendPixelBuffer errors out. I try to call avAssetWriter finishWriting but that returns AVAssetWriterStatusFailed.
Nothing works, my video is corrupted because it seems that my usual methods to finish up a recording session are not being allowed once a call is received.
What could I listen for to properly end a recording session when a phone call is received? The only thing I can currently do is listen for applicationWillResignActive and stop everything, but that prevents recording while a user receives a text message, etc. which would make my app work differently than the native Camera app.
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查看核心电话框架，特别是
CTCallCenter类。您可以注册一个callEventHandler，它是一个接受CTCall对象的块。该对象描述了呼叫状态。当呼叫对象指示有来电时尝试结束录音。Take a look at the Core Telephony framework, and specifically the
CTCallCenterclass. You can register ancallEventHandlerwhich is a block that accepts aCTCallobject. This object describes the call state. Try to end recording when the call object indicates it's an incoming call.