KlugTorch

<extensions>
    <extensionID>com.klug.torch.Torch</extensionID>
</extensions>

import com.klug.torch.Torch;
import flash.events.Event;

var torch:Torch = Torch.getInstance();

// iOS: true if the default (back) camera has a torch.
// Android 6+: true if a back-facing camera has a flash.
// False on devices without a light and on other platforms.
lightButton.visible = torch.isSupported;   // lightButton: your app's toggle button

var wantLight:Boolean = false;

torch.addEventListener( Event.CHANGE, onTorchChange );   // after every on() / off()

function setLight( on:Boolean ):void
{
    wantLight = on;
    if ( on ) torch.on();
    else      torch.off();
}

function onTorchChange( e:Event ):void
{
    // the event carries no detail: read mode for the current state
    lightButton.selected = torch.mode;

    if ( torch.mode != wantLight )   // the light could not be switched
        showMessage( "The light is not available right now." );   // your app
}

function stopStreaming():void
{
    if ( torch.mode ) setLight( false );   // first the light, then the camera
    stopCamera();                          // your app's stream shutdown
    torch.removeEventListener( Event.CHANGE, onTorchChange );
}