Requirements Document

Feature requirements for music player, visualizations, and XRPL integration

Specification

Requirements Document

Introduction

This feature implements a Progressive Web App (PWA) music player that combines traditional music playback capabilities with advanced Three.js visualizations and XRP Ledger NFT integration. The player will support local music files through localStorage and enhance the experience by incorporating visual assets from NFT metadata when available. The application will be built using Next.js and Three.js as a PWA, with consideration for future React Native expansion.

Requirements

Requirement 1

User Story: As a music listener, I want to load and play music files from my local storage, so that I can enjoy my personal music collection in the browser.

Acceptance Criteria

  1. WHEN a user selects music files THEN the system SHALL store them in localStorage for future access
  2. WHEN a user opens the application THEN the system SHALL display previously loaded music files from localStorage
  3. WHEN a user clicks play on a music file THEN the system SHALL begin audio playback with standard controls (play, pause, stop, volume, seek)
  4. WHEN a music file is playing THEN the system SHALL display current track information (title, duration, progress)

Requirement 2

User Story: As a music enthusiast, I want to see dynamic visualizations while music plays, so that I can have an immersive audio-visual experience.

Acceptance Criteria

  1. WHEN music is playing THEN the system SHALL display a Three.js-based visualization that responds to audio frequencies
  2. WHEN no NFT metadata is available THEN the system SHALL display one of several built-in animation presets
  3. WHEN static album art is available THEN the system SHALL have the option to display it instead of animations
  4. WHEN audio frequency data changes THEN the visualization SHALL update in real-time to reflect the audio characteristics

Requirement 3

User Story: As an NFT collector, I want to play audio/video NFTs from the XRP Ledger that have music traits, so that I can enjoy my digital music assets with enhanced visualizations.

Acceptance Criteria

  1. WHEN a user connects to XRP Ledger THEN the system SHALL authenticate and access the user's NFT collection
  2. WHEN scanning NFTs THEN the system SHALL identify NFTs with "music" traits in their metadata
  3. WHEN a music NFT is selected THEN the system SHALL load and play the associated audio/video content
  4. WHEN playing an NFT THEN the system SHALL extract visual assets from the NFT metadata for use in visualizations
  5. IF an NFT contains video content THEN the system SHALL support video playback with audio extraction for visualization

Requirement 4

User Story: As a user, I want an intuitive music player interface, so that I can easily control playback and navigate my music collection.

Acceptance Criteria

  1. WHEN the application loads THEN the system SHALL display a familiar music player UI with standard controls
  2. WHEN browsing music THEN the system SHALL provide a clear library view showing both local files and NFT music
  3. WHEN switching between tracks THEN the system SHALL provide next/previous navigation controls
  4. WHEN adjusting settings THEN the system SHALL allow users to toggle between visualization modes
  5. WHEN on mobile devices THEN the system SHALL provide a responsive interface optimized for touch interaction

Requirement 5

User Story: As a mobile user, I want to install and use the music player as a Progressive Web App, so that I can have a native-like experience on my device.

Acceptance Criteria

  1. WHEN accessing the application THEN the system SHALL provide PWA installation prompts on supported devices
  2. WHEN installed as PWA THEN the system SHALL function offline for previously cached music and core features
  3. WHEN using PWA THEN the system SHALL provide native-like navigation and interface behaviors
  4. WHEN in PWA mode THEN the system SHALL support background audio playback where permitted by the platform
  5. WHEN updating the PWA THEN the system SHALL provide seamless update mechanisms with user notification

Requirement 6

User Story: As a developer, I want the application built with scalable architecture, so that it can be extended to React Native in the future.

Acceptance Criteria

  1. WHEN designing components THEN the system SHALL separate business logic from UI presentation
  2. WHEN implementing audio handling THEN the system SHALL use abstractions that can be adapted for mobile platforms
  3. WHEN structuring the codebase THEN the system SHALL organize shared components and utilities for cross-platform reuse
  4. WHEN implementing XRP Ledger integration THEN the system SHALL use libraries compatible with both web and mobile environments

Requirement 7

User Story: As a user, I want reliable data persistence, so that my music library and preferences are maintained between sessions.

Acceptance Criteria

  1. WHEN the application closes THEN the system SHALL persist the current music library state to localStorage
  2. WHEN the application reopens THEN the system SHALL restore the previous music library and user preferences
  3. WHEN localStorage is full THEN the system SHALL provide appropriate error handling and cleanup options
  4. WHEN clearing data THEN the system SHALL provide user controls to manage stored music files and preferences
  5. WHEN using PWA offline THEN the system SHALL maintain access to cached music files and core functionality
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