Index: video_filter.codecs.inc
===================================================================
--- video_filter.codecs.inc	(revision 518)
+++ video_filter.codecs.inc	(working copy)
@@ -115,6 +115,23 @@
     'regexp' => '/slideshare\.net\/\?id=([a-z0-9]+).*doc=([a-z0-9-]+)/',
     'ratio' => 500 / 410,
   );
+  $codecs['picasa_slideshows'] = array(
+    'name' => t('Picasa Slideshows'),
+    'callback' => 'video_filter_picasa_slideshows',
+    'instructions' => t(
+                        'You must use the URL of the %rss for the Picasa album:',
+                        array('%rss' => 'RSS feed')
+                      ) .
+                      '<ol>' .
+                      '<li>' . t('View the album in Picasa (you should see thumbnails, not a slideshow).') . '</li>' .
+                      '<li>' . t('Find the "RSS" link and click it.') . '</li>' .
+                      '<li>' . t('Copy the resulting URL from the browser address bar.  Example: ') . '<br />' .
+                      '<code>[video: http://picasaweb.google.com/data/feed/base/user/USER_NAME/albumid/5568104935784209834?alt=rss&kind=photo&hl=en_US]</code>' .
+                      '</li>' .
+                      '</ol>',
+    'regexp' => '/picasaweb\.google\.com\/data\/feed\/base\/user\/([a-zA-Z0-9@_\-]+)\/albumid\/([a-z0-9]+)/i',
+    'ratio' => 800 / 600,
+  );
 
   return $codecs;
 }
@@ -270,4 +287,17 @@
   $video['source'] = 'http://static.slideshare.net/swf/ssplayer2.swf?id=' . $video['codec']['matches'][1] . '&amp;doc=' . ($video['codec']['matches'][2]);
 
   return video_filter_flash($video);
-}
\ No newline at end of file
+}
+
+function video_filter_picasa_slideshows($video) {
+  $slideshow_player_url = 'http://picasaweb.google.com/s/c/bin/slideshow.swf';
+  $video['source'] = $slideshow_player_url;
+
+  $user_name = $video['codec']['matches'][1];
+  $set_id = $video['codec']['matches'][2];
+
+  $params['flashvars'] = "host=picasaweb.google.com&amp;&amp;feat=flashalbum&amp;RGB=0x000000&amp;feed=http%3A%2F%2Fpicasaweb.google.com%2Fdata%2Ffeed%2Fapi%2Fuser%2F$user_name%2Falbumid%2F$set_id%3Falt%3Drss%26kind%3Dphoto%26" .
+                        ($video['autoplay'] ? '' : '&amp;noautoplay=1');
+
+  return video_filter_flash($video, $params);
+}