Audio Playback Application Documentation

This documentation outlines the functionality and features of the Audio Playback Application, a web-based tool designed for uploading audio tracks, selecting specific parts of these tracks, arranging these parts on a common timeline, and playing them sequentially. The application also includes a visual playback indicator and supports drag-and-drop reordering.

Installation

use

npm i
npm start

to start the react applicaton on localhost:3000

Features

• Audio Track Upload: Enables users to upload audio tracks for playback and manipulation.
• Part Selection: Allows users to select segments from uploaded tracks to add to a common timeline by clicking on the selected piece.
• Sequential Playback: Facilitates the sequential playback of selected audio parts on the common timeline, with a moving pointer to indicate the current playback position.
• Drag-and-Drop Reordering: Provides an interface for reordering audio parts on the timeline through drag-and-drop actions.

Component Structure

AudioTrack Component

Responsible for displaying individual audio tracks with functionalities to play, pause, and select parts of the track.

• Props:
  • track: Information about the track including its URL and selected parts.
  • onSelectPart: Callback function for handling part selection.

CommonTimeline Component

Displays the selected audio parts on a shared timeline, supports sequential playback with visual indicators, and allows drag-and-drop reordering.

• Props:
  • parts: Array of selected audio parts.
  • onDragEnd: Callback function for handling the reordering of parts.

Implementation Details

• State Management: Utilizes React's useState and useRef for managing component states and referencing DOM elements.
• Audio Playback: Employs the Web Audio API for precise audio playback control, including segment-specific playback.
• Drag-and-Drop Functionality: Integrates react-beautiful-dnd for an intuitive reordering interface.
• Visual Playback Indicator: Implements a dynamic pointer that moves across the timeline to indicate current playback position.
• Interfaces usage: Using the TrackPart interface to store the endTime and startTime along with the trackUrl to play the selected audio section on the common timeline, one by one.

Conclusion

The Audio Playback Application showcases the potential of React and the Web Audio API in creating a comprehensive audio manipulation tool. It addresses key challenges in audio processing and user interface design, offering a robust platform for interactive audio engagement with ample room for further development and expansion.