GPUImage for Android with Video Recording feature

Idea from: iOS GPUImage framework Base on: Android GPUImage framework

Requirements

• Android 4.3 or higher (OpenGL ES 2.0)

Concept

1. draw on current screen surface
2. switch to encoder input surface and draw previous frame buffer again on it
3. switch back to screen surface

Reference

1. EGL surface helper: https://github.com/google/grafika
2. Media encoder: https://github.com/saki4510t/AudioVideoRecordingSample