An iOS project to demonstrate use of Metal shaders with Camera Output and Video Recording.

This project has three main controllers

• CameraController: Handles capturing live frames from the iOS camera.
• MetalController: Processes incoming video frames and applies filters using Metal Shaders.
• RecordingController: Records the incoming frames to a mp4 file.

This project has three filters - Brightness, Saturation and Contrast which use Metal Compute Shaders at their core. These filters are added to a FilteringPipeline which applies them on the incoming frames.

The controllers are chained by coupling the output of one to the other.

They're linked as: CameraController -> MetalController -> RecordingController

captureSession?.output = metalSession?.input
metalSession?.output = recorder.input

CameraController consumes the frames from camera and outputs CMSampleBuffer frames. This output is linked to the input of MetalController. The MetalController's input consumes these buffers and applies the filters using the FilteringPipeline. The output of MetalController is again a CMSampleBuffer but with the filtering applied. This output is again linked to the input of RecordingController, which writes these buffers to a video file.

This project uses FPSCounter Pod to display the real time frames/second on the screen.