@paxapos/av-inputs

AV-Inputs - Professional Web Components Library

A high-performance StencilJS library providing optimized web components for camera, barcode scanning, and data input operations. Built for production environments with focus on performance, reliability, and cross-browser compatibility.

🎯 Components Overview

📷 input-barcode

Camera-based barcode/QR scanner

• Uses device camera for real-time scanning
• Supports 17+ barcode formats (QR, Code128, EAN, UPC, etc.)
• Optimized for continuous scanning with duplicate prevention
• Perfect for: POS systems, inventory management, product lookup

⌨️ input-scan-reader

Hardware barcode scanner input

• Captures input from physical barcode scanners (HID keyboard devices)
• Intelligent text processing for documents (DNI, licenses)
• Background operation without UI interference
• Perfect for: Dedicated scanner setups, access control, document verification

🤖 input-face-api-webcam

AI-powered face detection & recognition

• Real-time face detection using MediaPipe/TensorFlow.js
• Custom face recognition with trained models
• Auto photo capture with confidence thresholds
• Perfect for: Employee attendance, access control, ID verification

📸 input-file-from-webcam

Simple webcam photo capture

• Streamlined photo capture with one click
• Front/back camera switching
• Custom image processing support
• Perfect for: Employee check-ins, profile photos, quick documentation

🔧 Key Differences

Feature	input-barcode	input-scan-reader	input-face-api-webcam	input-file-from-webcam
Input Method	Camera scanning	Hardware scanner	AI face detection	Camera photo
Processing	Real-time decode	Keyboard events	Neural networks	Simple capture
Performance	Medium CPU	Minimal CPU	High CPU	Low CPU
Use Case	Mobile/tablet scanning	Fixed scanner stations	Security/attendance	Quick photos

⚡ Performance Features

• Memory efficient: Automatic cleanup and resource management
• Web Workers: Heavy computations don't block UI
• Optimized scanning: Intelligent duplicate prevention and timeouts
• Error recovery: Robust error handling with automatic restart
• Cross-platform: Works on desktop, mobile, and tablets

🚀 Quick Start

<!-- Camera barcode scanning -->
<input-barcode 
  facing-mode="environment" 
  width="400px" 
  height="300px">
</input-barcode>

<!-- Hardware scanner input -->
<input-scan-reader 
  scan-title="Scan ID Card"
  modal-timer="2000">
</input-scan-reader>

<!-- Face detection -->
<input-face-api-webcam 
  auto-capture="true"
  score-threshold="0.8">
</input-face-api-webcam>

<!-- Simple photo capture -->
<input-file-from-webcam 
  auto-start="true"
  image-quality="0.9">
</input-file-from-webcam>

const elInputFileFromWebcam = document.getElementById("my-input");
    elInputFileFromWebcam.addEventListener("click", (ev) => {

    elInputFileFromWebcam.takePic().then( (pic) => console.info("here is your picture", pic))
});

Properties

width

defaults to 460px in canvas you must set always the width

height

defaults to 460px in canvas you must set always the height

facing-mode

we uses "user" or "environment" but you have others. If you don't write this property. the element will change facinbg Mode each time you click the element

For more FacingModel optiones you cant read here https://developer.mozilla.org/en-US/docs/Web/API/MediaTrackConstraints/facingMode#value

callback for drawing on canvas

you can override the default behaviour by adding a callback function here. if you put something here. will execute this function for doing a canvas.drawImage

you must call ctx.drawImage(this.elVideo, left, top, imgSize, imgSize, 0,0, this.canvas.width, this.canvas.height) inside your function

we are just bypassing the callback function

let ctx = this.canvas.getContext('2d');
functionCallback.call(ctx, elVideo, left, top, imgSize, imgSize, 0,0, this.canvas.width, this.canvas.height);
```js


# Methods

## takePic
you can easily take a picture by calling this method in your element

```js
    elInputFileFromWebcam.takePic().then( (pic) => console.info("here is your picture", pic))

toggleCamera

Change front or back camera

    elInputFileFromWebcam.toggleCamera()

Events

pictureTaken

returns a File

    elInputFileFromWebcam.addEventListener("pictureTaken", (pic) => console.info("here is my pic from callback", pic))

facingModeChanged

returns a ConstrainDOMString each time a FacingModel was changed

    elInputFileFromWebcam.addEventListener("facingModeChanged", (fm) => console.info("here is your facing Mode now", fm))