Youtube Embed Tweak

Modifies Youtube embed videos, Forces all videos to a larger size (640x385) or (1024x576), With options for: Video Size, HD Playback, Https, Autohide, Theme, Hide Annotations and Hide Related.
当前为 2015-03-05 提交的版本，查看最新版本。
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// ==UserScript==
// @name        Youtube Embed Tweak
// @namespace	embedtweak
// @grant       none
// @icon   http://i.imgur.com/JyEgdDl.png
// @description	Modifies Youtube embed videos, Forces all videos to a larger size (640x385) or (1024x576), With options for: Video Size, HD Playback, Https, Autohide, Theme, Hide Annotations and Hide Related. 
// @version	1.52 (04 March 2015)
// @include	http*
// @exclude	*liveleak.com*
// @exclude	*.youtube.com/*
// ==/UserScript==      
//
// Set variables below
//
// Set Video Size, with a 16:9 preset, Large (1024x576) medium (720x405) small (640x385) or Set size in percentage, for a video size as a percantage of the container size. 
var videosize = 'medium';
// or
//var videosize = '50%';
// nochangeurl must be set to no for player settings to work. yes = default url and no = modified url, size is always modified.
var nochangeurl = 'no';
// hd = 0 or 1 or 2. 0 = default, 1 = 720p , 2 = 1080p. if available.
var hd = 1;
// theme, options: light or dark
var ytheme = 'dark';
// color, options: red or white
var ycolor = 'white';
// Set annotation = 0 or 1, 0 disables annotations
var annotation = 0;
// Show Related videos at end of playback, option: 1 or 0,
var related = 0;
// Force https option, 1 or 0, 1 enables https
var ssl = 1;
// Set autohide = 0 or 1, 1 enables auto hide of player controls. (0 is default behaviour)
var autohide = 1;
//
//
//
//
////////////////////////////////////////////////
// No need to modify anything past this point // 
////////////////////////////////////////////////


var ob = new MutationObserver(function(mutations){
  for (var m, i=0; i<mutations.length && (m=mutations[i]); i++)
    for (var nodes=m.addedNodes, n, j=0; j<nodes.length && (n=nodes[j]); j++)  // code thanks to wOxxOm
      if (n.nodeType == Node.ELEMENT_NODE)
        embedTweak(n);
});
ob.observe(document, {subtree:true, childList:true});

if (document.body)
  embedTweak(document.body);

function embedTweak(node) {

var i,j,k,index;
var video_id,video_url,video_link;
var risky_elements,risky_attributes,risky_node;
var risky_tags = [
  'object',
  'embed',
  'iframe'
];
var bad_elements = [
];
var bad_ids = [
];
for (i = 0; i < risky_tags.length; i++) {
  risky_elements = node.getElementsByTagName(risky_tags[i]);
  for (j = 0; j < risky_elements.length; j++) {
    index = 0;
    risky_attributes = risky_elements[j].attributes;
    for (k = 0; k < risky_attributes.length; k++) {
      risky_node = risky_attributes[k].nodeValue;
      if (risky_node.indexOf('youtube.com') >= 0) {
        risky_elements[j].style.display = 'none';
        if (risky_node.indexOf('/v/') >= 0) {
          index = risky_node.indexOf('/v/') + 3;
        } else if (risky_node.indexOf('?v=') >= 0) {
          index = risky_node.indexOf('?v=') + 3;
        } else if (risky_node.indexOf('/embed/') >= 0) {
          index = risky_node.indexOf('/embed/') + 7;
        }
        if (index > 0) {
          video_id = risky_node.substring(index, index + 11);
          bad_elements.push(risky_elements[j]);
          bad_ids.push(video_id);
        }
        break;
      }
    }
  }
}
for (i = 0; i < bad_ids.length; i++) {
  video_id = bad_ids[i];
  if (nochangeurl == 'yes') {
    video_url = 'http://www.youtube.com/embed/' + video_id;
  } 
  else {
    if (ssl == 1) {
      protid = 'https://'
    }
    if (ssl == 0) {
      protid = 'http://'
    }
    if (ytheme == 'light') {
      ythemeid = 'theme=light&';
    }
    if (ytheme == 'dark') {
      ythemeid = 'theme=dark&';
    }
    if (annotation == 0) {
      ivid = 'iv_load_policy=3&';
    }
    if (annotation == 1) {
      ivid = 'iv_load_policy=1&';
    }
    if (related == 0) {
      relatedid = 'rel=0&';
    }
    if (related == 1) {
      relatedid = 'rel=1&';
    }
    if (autohide == 1) {
      ahid = 'autohide=1&';
    }
    if (autohide == 0) {
      ahid = 'autohide=0&';
    }
    if (ycolor == 'red') {
      ycolorid = 'color=red&';
    }
    if (ycolor == 'white') {
      ycolorid = 'color=white&';
    }
    if (hd == 0) {
      hdid = 'vq=default&';
    }
    if (hd == 1) {
      hdid = 'vq=hd720&';
    }
    if (hd == 2) {
      hdid = 'vq=hd1080&';
    }
    video_url = protid + 'www.youtube.com/embed/' + video_id + '?' + ythemeid + ycolorid + ivid + relatedid + ahid + hdid;
  }
  video_link = document.createElement('iframe');
  video_link.setAttribute('src', video_url);
  if (vsm = videosize.match(/^\s*(\d+)%\s*$/)) { // percentage size code thanks to wOxxOm
    var parent = bad_elements[i].parentNode;
    while (parent) {
      available_width = parent.offsetWidth || parent.clientWidth;
      if (available_width > 0) {
        video_link.width = available_width * vsm[1] / 100;
        video_link.height = Math.floor(video_link.width / 16 * 9);
        break;
      }
      parent = parent.parentNode;
    }
  }
  if (videosize == 'large') {
    video_link.width = '1024';
    video_link.height = '576';
  }
  if (videosize == 'medium') {
    video_link.width = '720';
    video_link.height = '405';
  }
  if (videosize == 'small') {
    video_link.width = '640';
    video_link.height = '385';
  }
  video_link.setAttribute('frameborder', '0');
  video_link.setAttribute('allowfullscreen', '1');
  bad_elements[i].parentNode.replaceChild(video_link, bad_elements[i]);
}
}
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