Refactor FFmpeg options and image resizing logic

main.go

@@ -196,12 +196,13 @@ func generateArtworkAsync(urlStr, key, gifPath string) error {
 
 	err := ffmpeg.Input(urlStr).
 		Output(tempGifPath, ffmpeg.KwArgs{
-			"vf":                "fps=15,scale=500:-1:flags=lanczos",
-			"threads":           "8",
-			"preset":            "fast",
-			"multiple_requests": "1",
-			"buffer_size":       "8192k",
-			"loglevel":          "error", // Only log errors
+			"protocol_whitelist": "file,http,https,tcp,tls,crypto",
+			"vf":                 "fps=15,scale=500:-1:flags=lanczos",
+			"threads":            "8",
+			"preset":             "fast",
+			"multiple_requests":  "1",
+			"buffer_size":        "8192k",
+			"loglevel":           "error", // Only log errors
 		}).
 		GlobalArgs("-hide_banner"). // Hide the FFmpeg banner
 		OverWriteOutput().

task.go

@@ -111,19 +111,44 @@ func createArtistSquare(images []image.Image) (image.Image, error) {
 	size := 500
 	background := image.NewRGBA(image.Rect(0, 0, size, size))
 
+	resizeAndDraw := func(img image.Image, rect image.Rectangle) {
+		// Calculate aspect ratio
+		srcAspect := float64(img.Bounds().Dx()) / float64(img.Bounds().Dy())
+		dstAspect := float64(rect.Dx()) / float64(rect.Dy())
+
+		var resizedImg image.Image
+		if srcAspect > dstAspect {
+			// Image is wider, resize based on height
+			newHeight := uint(rect.Dy())
+			newWidth := uint(float64(newHeight) * srcAspect)
+			resizedImg = resize.Resize(newWidth, newHeight, img, resize.Lanczos3)
+		} else {
+			// Image is taller, resize based on width
+			newWidth := uint(rect.Dx())
+			newHeight := uint(float64(newWidth) / srcAspect)
+			resizedImg = resize.Resize(newWidth, newHeight, img, resize.Lanczos3)
+		}
+
+		// Calculate positioning to center the image
+		srcBounds := resizedImg.Bounds()
+		dx := (srcBounds.Dx() - rect.Dx()) / 2
+		dy := (srcBounds.Dy() - rect.Dy()) / 2
+		draw.Draw(background, rect, resizedImg, image.Point{dx, dy}, draw.Src)
+	}
+
 	switch len(images) {
 	case 2:
-		draw.Draw(background, image.Rect(0, 0, size/2, size), resize.Resize(uint(size/2), uint(size), images[0], resize.Lanczos3), image.Point{}, draw.Src)
-		draw.Draw(background, image.Rect(size/2, 0, size, size), resize.Resize(uint(size/2), uint(size), images[1], resize.Lanczos3), image.Point{}, draw.Src)
+		resizeAndDraw(images[0], image.Rect(0, 0, size/2, size))
+		resizeAndDraw(images[1], image.Rect(size/2, 0, size, size))
 	case 3:
-		draw.Draw(background, image.Rect(0, 0, size, size/2), resize.Resize(uint(size), uint(size/2), images[0], resize.Lanczos3), image.Point{}, draw.Src)
-		draw.Draw(background, image.Rect(0, size/2, size/2, size), resize.Resize(uint(size/2), uint(size/2), images[1], resize.Lanczos3), image.Point{}, draw.Src)
-		draw.Draw(background, image.Rect(size/2, size/2, size, size), resize.Resize(uint(size/2), uint(size/2), images[2], resize.Lanczos3), image.Point{}, draw.Src)
+		resizeAndDraw(images[0], image.Rect(0, 0, size, size/2))
+		resizeAndDraw(images[1], image.Rect(0, size/2, size/2, size))
+		resizeAndDraw(images[2], image.Rect(size/2, size/2, size, size))
 	case 4:
-		draw.Draw(background, image.Rect(0, 0, size/2, size/2), resize.Resize(uint(size/2), uint(size/2), images[0], resize.Lanczos3), image.Point{}, draw.Src)
-		draw.Draw(background, image.Rect(size/2, 0, size, size/2), resize.Resize(uint(size/2), uint(size/2), images[1], resize.Lanczos3), image.Point{}, draw.Src)
-		draw.Draw(background, image.Rect(0, size/2, size/2, size), resize.Resize(uint(size/2), uint(size/2), images[2], resize.Lanczos3), image.Point{}, draw.Src)
-		draw.Draw(background, image.Rect(size/2, size/2, size, size), resize.Resize(uint(size/2), uint(size/2), images[3], resize.Lanczos3), image.Point{}, draw.Src)
+		resizeAndDraw(images[0], image.Rect(0, 0, size/2, size/2))
+		resizeAndDraw(images[1], image.Rect(size/2, 0, size, size/2))
+		resizeAndDraw(images[2], image.Rect(0, size/2, size/2, size))
+		resizeAndDraw(images[3], image.Rect(size/2, size/2, size, size))
 	default:
 		return nil, fmt.Errorf("unsupported number of images: %d", len(images))
 	}