[bbc] add 'width' option (#1706)

docs/configuration.rst

@@ -783,6 +783,19 @@ Description
     * ``false``: Get posts from "Latest Updates" pages
 
 
+extractor.bbc.width
+-------------------
+Type
+    ``int``
+Default
+    ``1920``
+Description
+    Specifies the requested image width.
+
+    This value must be divisble by 16 and gets rounded down otherwise.
+    The maximum possible value appears to be ``1920``.
+
+
 extractor.blogger.videos
 ------------------------
 Type

docs/gallery-dl.conf

@@ -41,6 +41,9 @@
             "password": null,
             "recursive": true
         },
+        "bbc": {
+            "width": 1920
+        },
         "blogger":
         {
             "videos": true

gallery_dl/extractor/bbc.py

@@ -49,8 +49,12 @@ class BbcGalleryExtractor(GalleryExtractor):
         }
 
     def images(self, page):
+        width = self.config("width")
+        width = width - width % 16 if width else 1920
+        dimensions = "/{}xn/".format(width)
+
         return [
-            (src.replace("/320x180_b/", "/1920xn/"), None)
+            (src.replace("/320x180_b/", dimensions), None)
             for src in text.extract_iter(page, 'data-image-src="', '"')
         ]