您好，我正在尝试使用相机 v2 API 来使用 Raspberry Pi 3 设备录制视频，该设备使用连接到它的 Raspberry Pi 相机模块。

我正在使用带有 Kotlin 的 Android Things 进行开发。

这是我的视频录制代码的样子。

  override fun startRecording(videoCameraCallback: VideoCameraCallback) {
    val cameraIdList = cameraManager.cameraIdList
    cameraManager.openCamera(cameraIdList[0], cameraStateCalback, null)

    Log.d("JJJ", "start recording called")
}

    var cameraStateCalback = object : CameraDevice.StateCallback() {
    override fun onOpened(camera: CameraDevice?) {
        if (camera != null) {
            Log.d("JJJ", "onOpened and will now create handler and capture session")
            //create handler thread
            val thread = HandlerThread("MyHandlerThread")
            thread.start()
            val handler = Handler(thread.looper)

            //create capture session
            val mediaRecorderSurface = setMediaOutputSurface()
            val surfaces = ArrayList<Surface>()
            surfaces.add(mediaRecorderSurface)
            captureRequest =  camera.createCaptureRequest(TEMPLATE_RECORD).build()
            camera.createCaptureSession(surfaces, cameraCaptureSessionCallBack,handler)
            Log.d("JJJ", "Created thread handler and capture session")
        }
    }

    override fun onDisconnected(camera: CameraDevice?) {
        Log.d("JJJ", "on disconnected")
    }

    override fun onError(camera: CameraDevice?, error: Int) {
        Log.d("JJJ", "on error")
    }
}



 var  cameraCaptureSessionCallBack = object :  CameraCaptureSession.StateCallback(){

    override fun onConfigureFailed(session: CameraCaptureSession?) {
        Log.d("JJJ", "on configured failed")
    }

    override fun onConfigured(session: CameraCaptureSession?) {
        Log.d("JJJ", "start recording")
        mediaRecorder.start()

    }
}


    private fun setMediaOutputSurface(): Surface {
          var file = File(context.filesDir.absolutePath)
        if(file.canWrite() && file.canRead()){
            Log.d("JJJ", "File location is fine")
        }

        mediaRecorder = MediaRecorder()
        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE) //changed this to surface from camera and it fixed the cant get surface error

        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4)
        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264)
        mediaRecorder.setVideoSize(600,600)


//        mediaRecorder.setVideoEncodingBitRate(10000000)
//        mediaRecorder.setVideoEncodingBitRate(512 * 1000)
        mediaRecorder.setOutputFile(context.filesDir.absolutePath + "/"+System.currentTimeMillis() + ".mp4")
        mediaRecorder.setVideoFrameRate(30)

        mediaRecorder.prepare()
//        mediaRecorder.start()
        return mediaRecorder.surface

}

这是我的策略

1. 使用相机管理器获取相机 ID 列表。
2. 打开列表中的第一个摄像头(仅附加一个摄像头
3. 打开成功后，创建处理线程
4. 使用所有必要的参数(视频源、帧率等)创建 mediaRecorder
5. 从 mediaRecorder(失败的地方)获取表面对象
6. 使用来自媒体播放器的表面和之前创建的处理程序创建捕获请求
7. 配置成功后，调用mediaRecorder.start开始录制视频。

我得到的完整堆栈跟踪错误如下:

  12-01 09:58:23.981 8776-8776/com.jr.survailancedropboxcam W/CameraDevice-JV-0: Stream configuration failed due to: endConfigure:372: Camera 0: Unsupported set of inputs/outputs provided
12-01 09:58:23.985 8776-8958/com.jr.survailancedropboxcam D/JJJ: on configured failed
12-01 09:58:23.985 8776-8776/com.jr.survailancedropboxcam E/CameraCaptureSession: Session 0: Failed to create capture session; configuration failed

提前致谢

最佳答案

借助最新版本 (AndroidThings DP 6)，您可以使用 Camera v2 API

https://android-developers.googleblog.com/2017/11/android-things-developer-preview-6.html

这应该有效:https://github.com/googlesamples/android-Camera2Basic

您需要确保在 list 中将标志设置为 true

<activity

    ...
    android:hardwareAccelerated="true">

the Camera2Basic sample using the Camera2 API and TextureView now works on both NXP and Raspberry Pi based devices (with the hardwareAccelerated flag set to true)

关于安卓录像机: failed to get surface，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47582970/