ios - swift 3 : How to mute/unmute microphone during video recording using AVFoundation

Question

我正在录制视频，使用 AVFoundation 和 Swift 3 创建自定义相机。现在我想添加功能以在单击按钮时在视频录制期间静音/取消静音音频。我该如何实现？

Answer 1

我希望你使用 AVCaptureMovieFileOutput 从 AVFoundation 录制你的视频

没有直接的方法，但是如果你仔细阅读文档你可以看到

• AVCaptureMovieFileOutput 是 AVCaptureOutput 的子类
• 您可以通过 func connection(withMediaType mediaType: String!) -> AVCaptureConnection 单独从您的 AVCaptureMovieFileOutput 获得音频连接! 通过将媒体类型作为音频传递
• 单独获得auido连接后，将其禁用即可

swift 示例

let movieFileOutput : AVCaptureMovieFileOutput
// your code to initialize output
var audioConnection :AVCaptureConnection? = movieFileOutput.connection(withMediaType:AVMediaTypeAudio)
if let connection = audioConnection {
    connection.isEnabled = false;
}

表单文档

对于 AVCaptureConnection 属性 enabled

The value of this property is a BOOL that determines whether the receiver's output should consume data from its connected inputPorts when a session is running. Clients can set this property to stop the flow of data to a given output during capture. The default value is YES.