#
// ==UserScript==
#
// @name           Download YouTube Captions
#
// @namespace      http://userscripts.org/*
#
// @include        http://www.youtube.com/watch?*
#
// ==/UserScript==
#
var id = unsafeWindow.pageVideoId;
#
var caption_array=[false];
#
function make_timeline(time)
#
{
#
        var string="";
#
        var integer=0;
#
        time=time "";
#
        if(seconds=time.match(/\.(.*)/))
#
                seconds=Math.round(parseFloat(seconds[1].substr(0,1) "." seconds[1].substr(1,2)));
#
        else
#
                seconds="0";
#
        time=parseInt(time);
#
        if(time>=36000)
#
        {
#
                integer=Math.floor(time/3600);
#
                time-=3600*integer;
#
                string =integer ":";
#
        }
#
        else if(time>=3600)
#
        {
#
                integer=Math.floor(time/3600);
#
                time-=3600*integer;
#
                string ="0" integer ":";
#
        }
#
        else string ="00:";
#
        if(time>=600)
#
        {
#
                integer=Math.floor(time/60);
#
                time-=60*integer;
#
                string =integer ":";
#
        }
#
        else if(time>=60)
#
        {
#
                integer=Math.floor(time/60);
#
                time-=60*integer;
#
                string ="0" integer ":";
#
        }
#
        else
#
                string ="00:";
#
        integer=Math.floor(time);
#
        if(time>=10)
#
                string =integer "," seconds;
#
        else
#
                string ="0" integer "," seconds;
#
        return string;
#
};
#
function parse_captions(xml)
#
{
#
        var captions=new DOMParser().parseFromString(xml,"text/xml").getElementsByTagName("text");
#
        var srt_output="";
#
        Array.forEach(captions,function(caption,i)
#
        {
#
                srt_output = i   "\n"
#
                          make_timeline(caption.getAttribute("start"))
#
                          " --> "
#
                          make_timeline(parseFloat(caption.getAttribute("start"))
#
                          parseFloat(caption.getAttribute("dur")))
#
                          "\n"   caption.textContent.replace(/&#(\d );/g,function($0, $1) {
#
                                return String.fromCharCode(Number($1));
#
                        }).replace(/&/g,"&")   "\n\n";
#
        });
#
        return srt_output;
#
};
#
function load_caption(selector)
#
{
#
        var caption=caption_array[selector.selectedIndex];
#
        if(!caption)return;
#
        GM_xmlhttpRequest({
#
                method:"GET",
#
                url:"http://video.google.com/timedtext?hl=" caption.lang_code "&lang=" caption.lang_code "&name=" caption.name "&v=" id,
#
                onload:function(xhr)
#
                {
#
                        if(xhr.responseText!="")
#
                                location.href="data:text/srt;charset=utf-8," encodeURIComponent(parse_captions(xhr.responseText));
#
                        else
#
                                alert("Error: No response from server.");
#
                        document.getElementById("captions_selector_option").selected=true;
#
                }
#
        });
#
};
#
function load_captions(video_code)
#
{
#
        GM_xmlhttpRequest({
#
                method:"GET",
#
                url:"http://video.google.com/timedtext?hl=en&v=" id "&type=list",
#
                onload:function(xhr)
#
                {
#
                        if(xhr.responseText=="")
#
                        {
#
                                document.getElementById("captions_selector_option").innerHTML="No Captions";
#
                                return;
#
                        }
#
                        var captions=new DOMParser().parseFromString(xhr.responseText,"text/xml").getElementsByTagName("track");
#
                        var select=document.getElementById("captions_selector");
#
                        Array.forEach(captions,function(caption,i)
#
                        {
#
                                var caption_info= {
#
                                        name : caption.getAttribute("name"),
#
                                        lang_code : caption.getAttribute("lang_code"),
#
                                        lang_name : caption.getAttribute("lang_translated")
#
                                };
#
                                caption_array.push(caption_info);
#
                                var option=document.createElement("option");
#
                                option.innerHTML=caption_info.lang_name;
#
                                select.appendChild(option);
#
                        });
#
                        document.getElementById("captions_selector_option").innerHTML="-Download Captions-";
#
                        document.getElementById("captions_selector").disabled=false;
#
                }
#
        });
#
};
#
(function()
#
{
#
        var div=document.createElement("div")
#
        div.setAttribute("style","padding-top:5px;");
#
        var select=document.createElement("select");
#
        select.id="captions_selector";
#
        select.disabled=true;
#
        var option=document.createElement("option");
#
        option.id="captions_selector_option";
#
        option.innerHTML="Loading Captions";
#
        option.selected=true;
#
        select.appendChild(option);
#
        select.addEventListener("change",function()
#
        {
#
                load_caption(this);
#
        },false);
#
        div.appendChild(select);
#
        var tabs=document.getElementById("watch-actions-area").getElementsByTagName("div")[0];
#
        var last_element=tabs.getElementsByTagName("div");
#
        tabs.insertBefore(div, last_element[last_element.length-1]);
#
        load_captions();
#
})();