Add remote URL option to examples

examples/thumbnail-generation/thumbnail-generation.ts

@@ -1,9 +1,10 @@
-import { Input, ALL_FORMATS, BlobSource, CanvasSink } from 'mediabunny';
+import { Input, ALL_FORMATS, BlobSource, UrlSource, CanvasSink } from 'mediabunny';
 
 import SampleFileUrl from '../../docs/assets/big-buck-bunny-trimmed.mp4';
 (document.querySelector('#sample-file-download') as HTMLAnchorElement).href = SampleFileUrl;
 
-const selectMediaButton = document.querySelector('button') as HTMLButtonElement;
+const selectMediaButton = document.querySelector('#select-file') as HTMLButtonElement;
+const loadUrlButton = document.querySelector('#load-url') as HTMLButtonElement;
 const fileNameElement = document.querySelector('#file-name') as HTMLParagraphElement;
 const horizontalRule = document.querySelector('hr') as HTMLHRElement;
 const thumbnailContainer = document.querySelector('#thumbnail-container') as HTMLDivElement;
@@ -12,16 +13,19 @@ const errorElement = document.querySelector('#error-element') as HTMLParagraphEl
 const THUMBNAIL_COUNT = 16;
 const THUMBNAIL_SIZE = 200;
 
-const generateThumbnails = async (file: File) => {
-	fileNameElement.textContent = file.name;
+const generateThumbnails = async (resource: File | string) => {
+	fileNameElement.textContent = resource instanceof File ? resource.name : resource;
 	horizontalRule.style.display = '';
 	errorElement.textContent = '';
 	thumbnailContainer.innerHTML = '';
 
 	try {
-		// Create a new input from the file
+		// Create a new input from the resource
+		const source = resource instanceof File
+			? new BlobSource(resource)
+			: new UrlSource(resource);
 		const input = new Input({
-			source: new BlobSource(file),
+			source,
 			formats: ALL_FORMATS, // Accept all formats
 		});
 
@@ -122,6 +126,19 @@ selectMediaButton.addEventListener('click', () => {
 	fileInput.click();
 });
 
+loadUrlButton.addEventListener('click', () => {
+	const url = prompt(
+		'Please enter a URL of a media file. Note that it must support cross-origin requests, so have the right'
+		+ ' CORS headers set.',
+		'http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4',
+	);
+	if (!url) {
+		return;
+	}
+
+	void generateThumbnails(url);
+});
+
 document.addEventListener('dragover', (event) => {
 	event.preventDefault();
 	event.dataTransfer!.dropEffect = 'copy';