Project Overview: SoundIt

SoundIt is a C# application that processes YouTube video URLs to extract the medium-quality audio stream URL and the corresponding video title. It achieves this by:

Features and Workflow

1. URL Validation

   • Uses a regex pattern to ensure the input URL is a valid YouTube video link.

2. API Communication

   • Sends an HTTP POST request to YouTube's internal API with a structured payload to fetch video details.

3. Audio Quality Handling

   • Filters and prioritizes audio streams with "AUDIO_QUALITY_MEDIUM" from the API response.

4. Async Operations

   • Implements asynchronous processing for HTTP requests and JSON parsing for better performance.

How It Works

1. The application validates and extracts the YouTube video ID from the provided URL using a regular expression.
2. It sends a POST request to a YouTube API endpoint with the extracted video ID and a predefined payload.
3. The JSON response is parsed to retrieve:
   • The audio stream URL.
   • The title of the video.
4. These two elements are returned as output.

Key Methods

• isCorrectPattern(string s): string
  Validates the input URL and extracts the YouTube video ID using a regex pattern.

• AddPayload(string id): void
  Constructs the payload required for the API request, including client context information.

• MakeRequest(string id): Task<JObject>
  Sends an HTTP POST request to the YouTube API and parses the JSON response.

• Execute(): Task<string[]>
  Orchestrates the process of validation, API communication, and extraction of audio and title data.

Use Case

This application is ideal for scenarios where users need to extract audio and metadata from YouTube videos programmatically, such as:

• Creating audio-only playlists.
• Integrating with other media applications.