[android-developers] onPreviewFrame() not being called the same number of times as the frame rate

I've created a subclass of SurfaceView which also implements Camera.PreviewCallback & SurfaceHolder.Callback. The time difference between onPreviewFrame() calls is about 0.25 seconds which is 4/sec but the actual preview frame rate is definitely more than 25. I can't figure out why this is happening

The following are my classes

https://dpaste.de/FP9QU/

https://dpaste.de/as87Q/

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