我有一个运行设置如下的 AVCaptureVideoDataOutput 会话，它运行良好并将缓冲区记录到文件中。
我还想录制音频，但缓冲区中似乎没有任何音频，即使我已将麦克风添加为 captureSession 的输入。
我怀疑我还需要使用 AVCaptureAudioDataOutput。
func setupCaptureSession()
{
captureSession.beginConfiguration()
captureSession.sessionPreset = AVCaptureSessionPreset1280x720
videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "sample
buffer delegate", attributes: []))
videoOutput.videoSettings = [(kCVPixelBufferPixelFormatTypeKey as NSString) : NSNumber(value: kCVPixelFormatType_32BGRA as UInt32)]
videoOutput.alwaysDiscardsLateVideoFrames = true
captureSession.addOutput(videoOutput)
captureSession.addInput(deviceInputFromDevice(backCameraDevice))
captureSession.addInput(deviceInputFromDevice(micDevice))
captureSession.commitConfiguration()
captureSession.startRunning()
}
然后这是我获取视频缓冲区并将其发送到文件中的方法
func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!)
{
writeVideoFromData(sampleBuffer) // a function that writes the buffer to disk
}