Functionality of the Audio Normalizer Application

File Upload

✔ Multiple File Upload: Users can upload multiple audio files (e.g., .mp3, .wav) simultaneously.
✔ Drag-and-Drop Support: Files can be dragged directly into the browser window or selected via an HTML file input.

Audio Analysis

The application analyzes each uploaded file and calculates:

✔ RMS Value (Root Mean Square): Measures the average loudness of the file.
✔ Peak Value: Identifies the highest volume level within the file.

Normalization

✔ Adjust RMS Value: Users can normalize individual files or apply a global RMS value to all uploaded files.
✔ Consistent Audio Levels: The normalizer adjusts audio data to ensure uniform loudness across all files.

Playback of Original & Normalized Versions

✔ Users can preview both the original and normalized versions directly in the browser.

Export & Deletion

✔ Download Normalized Files: Files can be exported as .wav format.
✔ Remove Files: Uploaded files can be deleted from the list when no longer needed.

Visual Progress Indicators

✔ Progress bars show the status of uploading, normalizing, and exporting operations.

Global Control

✔ Apply a single RMS value to all uploaded files for consistent loudness adjustment.

Technical Structure

1. HTML Structure

✔ Layout:

• A central container (<div class="container">) holds all UI elements.

• Includes elements such as:

  • <input type="file"> for file selection.

  • <button> for global actions (export, delete).

  • <div> elements for progress bars, file lists, and status updates.

✔ Responsive Design:

• Uses <meta name="viewport"> to adapt to various screen sizes.

2. CSS Design & User Experience

✔ Modern, Minimalist UI:

• Features rounded corners, shadows, and subtle color accents.

• Important UI elements (buttons, progress bars) stand out with contrast.

✔ Styling Highlights:

• .progress-bar-inner – Animated progress bars with smooth transitions.

• .toggle-play-btn – Interactive buttons with hover/focus effects.

• .container – Centralized card-style design with shadow effects.

3. JavaScript Logic – Core Functions

3.1 File Upload

✔ Function: handleFiles(event)

• Reads uploaded files and validates formats.

• Filters out unsupported or non-audio files.

3.2 Audio Analysis

✔ Web Audio API Integration:

• Uses OfflineAudioContext for efficient audio processing.

✔ Loudness Analysis:

• calculateRMS(buffer) – Computes Root Mean Square loudness.

• calculatePeak(buffer) – Detects peak volume levels.

✔ Data Storage:

• Stores both original and normalized values for further processing.

3.3 Normalization

✔ Scaling Audio Data:

• scaleAudioBufferWithHandling(fileData, targetRms) – Adjusts RMS loudness to the target value.

• Uses Gain Nodes in the Web Audio API for precise volume adjustments.

3.4 Playback & Interaction

✔ Audio Playback:

• Users can switch between original and normalized versions.

• Functions:

  • playOriginal(fileData) – Plays the original file.

  • playNormalized(fileData) – Plays the normalized file.

✔ UI Updates:

• Progress bars update dynamically (updateProgressBars).

• File list is refreshed in real time (addFileToList).

3.5 Exporting & Deleting Files

✔ Export to .wav Format:

• Function: bufferToWave(abuffer, offset, len) – Converts an AudioBuffer to a WAV file.

✔ File Removal:

• Deletes files from memory and frees resources.

Special Features

✔ Efficient Audio Processing:

• Uses Offline Audio Contexts for fast and resource-efficient processing.

✔ User-Friendly Design:

• Intuitive UI with visual feedback.

✔ Scalability:

• Users can control individual files or apply global settings.

Conclusion

The Audio Normalizer provides a modern, browser-based solution for adjusting audio volume efficiently.

🎵 Key Highlights:
✔ Multi-file upload & batch processing
✔ Real-time RMS & peak analysis
✔ Customizable normalization options
✔ Built-in playback & WAV export
✔ Fast Web Audio API processing

🔹 Perfect for podcasters, musicians, and audio professionals who need a quick and reliable way to normalize audio files directly in the browser! 🚀

The Audio Normalizer application is a modern, browser-based interface for uploading, analyzing, and normalizing audio files. It offers a comprehensive set of features to process audio files and adjust volume levels efficiently