问Android Camera2 API -视频始终保存在横向

EN

   void PrepareMediaRecorder()
    {
        if (mediaRecorder == null)
        {
            mediaRecorder = new MediaRecorder();
        }
        else
        {
            mediaRecorder.Reset();
        }

        var map = (StreamConfigurationMap)characteristics.Get(CameraCharacteristics.ScalerStreamConfigurationMap);
        if (map == null)
        {
            return;
        }

        videoFileName = GetVideoFilePath();

        mediaRecorder.SetAudioSource(AudioSource.Mic);
        mediaRecorder.SetVideoSource(VideoSource.Surface);
        mediaRecorder.SetOutputFormat(OutputFormat.Mpeg4);
        mediaRecorder.SetOutputFile(videoFileName);
        mediaRecorder.SetVideoEncodingBitRate(10000000);
        mediaRecorder.SetVideoFrameRate(30);
        var videoSize = ChooseVideoSize(map.GetOutputSizes(Java.Lang.Class.FromType(typeof(MediaRecorder))));
        mediaRecorder.SetVideoEncoder(VideoEncoder.H264);
        mediaRecorder.SetAudioEncoder(AudioEncoder.Aac);
        mediaRecorder.SetVideoSize(videoSize.Width, videoSize.Height);
        int rotation = (int)Activity.WindowManager.DefaultDisplay.Rotation;
        mediaRecorder.SetOrientationHint(GetOrientation(rotation));
        mediaRecorder.Prepare();
    }