[SOLVED] How to concat three YUV buffers to one array?

How to concat three YUV buffers to one array?

I'm working with Android SDK for IoT camera. I want to implement taking snapshots from the camera and save it to the external storage. SDK provides a method for that which takes absoluteFilePath as a parameter.

int snapshot(String absoluteFilePath, Context context, OperationDelegateCallBack callBack);

Unfortunately because of scope storage introduced in Android 10 this method is not working. There is info that If I want to use scope storage I need to implement this feature by myself. In this case, I need to get raw frame data in YUV420SP (NV21) format. SDK provides callback for that:

fun onReceiveFrameYUVData(
            sessionId: Int,
            y: ByteBuffer,
            u: ByteBuffer,
            v: ByteBuffer,
            videoFrameInfo: TuyaVideoFrameInfo?,
            camera: Any?,
        )

I would like to use YuvImage class from android graphics package to convert this image to JPEG (it provides method compressToJpeg). Constructor of that class takes only a single byte array as a parameter. Callback from SDK provides YUV components as separate buffers. How should I concat those three buffers into one array to use YuvImage class?

BTW Is this the proper approach or maybe should I use something else?

SDK documentation: https://developer.tuya.com/en/docs/app-development/avfunction?id=Ka6nuvucjujar#title-3-Video%20screenshots

Solution

Unfortunately because of scope storage introduced in Android 10 this method is not working.

Of course it still works if you use a normal writable and readable full path.

For Android 10 you dont have to change your usual path. (I do not understand that you have any problem there).

For Android 11+ use public image directories like DCIM and Pictures.