Technical Overview

Application Flow

com.oranbyte.screenrec.Main initializes JavaFX with JFXPanel, then creates the Swing MainFrame on the Swing event-dispatch thread. The main window creates a selection frame and delegates capture-area selection to DrawSelectRectangle.

Recording Pipeline

ScreenRecorder uses java.awt.Robot to capture frames from the selected Rectangle. Frames are converted to BGR images, the cursor image is drawn when available, and frames are encoded through Xuggler/Xuggle into an H.264 video stream.

The recorder maintains separate microphone and system-audio capture paths. Microphone samples come from a Java Sound TargetDataLine. System audio uses WasapiAudioSource in loopback mode through JNA and Windows COM/WASAPI calls. Audio is normalized to a 44.1 kHz, mono, 16-bit target format and mixed before being encoded as AAC.

Pause time is excluded from the recording timestamps and elapsed-time calculation. Capture and encoding run on dedicated worker threads, while the Swing UI remains responsive.

Sharing Pipeline

The share UI uses FileShareManager and the FileShareProvider abstraction. The current nearby-sharing provider is LocalSend. It discovers devices on the local network, establishes an HTTPS session with the selected device, uploads the file, and reports progress through TransferListener.

The LocalSend server sanitizes incoming file names to the file-name component before resolving its download path. Transfers can be cancelled; the active HTTP client and session state are then reset.

Main Dependencies

Current Platform Boundary

The UI and core screen capture use Java APIs, but system-audio capture and several integration features depend on Windows. The documented setup should therefore be treated as Windows-specific until platform-specific audio sources and native integrations are added.