ios - 使用 AVCaptureVideoDataOutput 和 AVCaptureAudioDataOutput

Question

我运行了一个 AVCaptureVideoDataOutput session ，设置如下，效果很好，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()
}

然后这是我如何获取视频缓冲区并将其发送到文件中

func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!)
{

writeVideoFromData(sampleBuffer) // a function that writes the buffer to disk

}

Answer 1

检查func captureOutput(AVCaptureOutput, didOutput: CMSampleBuffer, from: AVCaptureConnection)
如果您想从 AVCaptureAudioDataOutput 获取音频样本数据，则使用 AVCaptureAudioDataOutputSampleBufferDelegate https://developer.apple.com/documentation/avfoundation/avcaptureaudiodataoutputsamplebufferdelegate