Enhanced Qt Audio Recorder

This project is an enhanced version of the Qt Audio Recorder example, modified for educational purposes to demonstrate various design patterns in C++/Qt application development.

Project Overview

The original Qt Audio Recorder example provides a simple GUI application for recording audio using Qt's multimedia capabilities. This project extends that foundation by implementing several design patterns to demonstrate software engineering principles in a practical context.

Design Patterns Implemented

This project implements the following design patterns:

1. Observer Pattern: Implemented through Observer and Subject interfaces to allow various components to monitor recording state changes.

   • StatusObserver: Updates the UI status bar with recording state
   • RecordingTimeDisplay: Updates the recording time display
   • LogFileObserver: Logs recording events to a file

2. State Pattern: Manages recording state transitions with:

   • RecordingState: Behavior when recording
   • PausedState: Behavior when paused
   • StoppedState: Behavior when stopped

3. Command Pattern: Encapsulates recording operations as objects:

   • StartRecordingCommand: Initiates recording
   • PauseRecordingCommand: Pauses recording
   • ResumeRecordingCommand: Resumes recording
   • StopRecordingCommand: Stops recording
   • Includes a command history feature visible in the UI

4. Strategy Pattern: Allows different audio encoding approaches:

   • ConstantQualityStrategy: Prioritizes quality over file size
   • ConstantBitRateStrategy: Maintains consistent bit rate

5. Facade Pattern: Simplifies access to the recording subsystem:

   • RecordingFacade: Provides a unified interface to the various recording components

Getting Started

Prerequisites

• Qt 6.0 or higher
• C++17 compatible compiler

Building the Project

1. Open the project file audiorecorder.pro in Qt Creator
2. Configure the project for your development environment
3. Build and run the application

License

This project is distributed under the BSD 3-Clause License. See the LICENSE file for details.

The original Qt example code is Copyright (C) 2017 The Qt Company Ltd. and is used under the BSD 3-Clause License.

Acknowledgments

• Qt Company for providing the original audio recorder example
• This project is for educational purposes only