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文章: 备份一个video的JS [打印]

分类: Javascript

作者: gouki

2012-02-16 17:58

备份一个JS，不是为了代码很优秀，而是。。。想直接用里面的事件，就当成参考了：

JavaScript代码

var media_events=new Array();
// was extracted from the spec in November 2011
media_events["loadstart"]=0;
media_events["progress"]=0;
media_events["suspend"]=0;
media_events["abort"]=0;
media_events["error"]=0;
media_events["emptied"]=0;
media_events["stalled"]=0;
media_events["loadedmetadata"]=0;
media_events["loadeddata"]=0;
media_events["canplay"]=0;
media_events["canplaythrough"]=0;
media_events["playing"]=0;
media_events["waiting"]=0;
media_events["seeking"]=0;
media_events["seeked"]=0;
media_events["ended"]=0;
media_events["durationchange"]=0;
media_events["timeupdate"]=0;
media_events["play"]=0;
media_events["pause"]=0;
media_events["ratechange"]=0;
media_events["volumechange"]=0;
var media_controller_events=new Array();
// was extracted from the spec in November 2011
media_controller_events["emptied"]=0;
media_controller_events["loadedmetadata"]=0;
media_controller_events["loadeddata"]=0;
media_controller_events["canplay"]=0;
media_controller_events["canplaythrough"]=0;
media_controller_events["playing"]=0;
media_controller_events["ended"]=0;
media_controller_events["waiting"]=0;
media_controller_events["durationchange"]=0;
media_controller_events["timeupdate"]=0;
media_controller_events["play"]=0;
media_controller_events["pause"]=0;
media_controller_events["ratechange"]=0;
media_controller_events["volumechange"]=0;
// was extracted from the spec in November 2011
var media_properties=[ "error","src","currentSrc","crossOrigin","networkState","preload","buffered","readyState","seeking","currentTime","initialTime","duration","startOffsetTime","paused","defaultPlaybackRate","playbackRate","played","seekable","ended","autoplay","loop","mediaGroup","controller","controls","volume","muted","defaultMuted","audioTracks","videoTracks","textTracks","width","height","videoWidth","videoHeight","poster" ];
var media_properties_elts=null;
var webm=null;
function init(){
document._video=document.getElementById("video");
webm=document.getElementById("webm");
init_events();
init_properties();
init_mediatypes();
// properties are updated even if no event was triggered
setInterval(update_properties,500);
}
document.addEventListener("DOMContentLoaded",init,false);
function init_events(){
for(key in media_events){
document._video.addEventListener(key,capture,false);
}
var tbody=document.getElementById("events");
var i=1;
var tr=null;
for(key in media_events){
if(tr==null) tr=document.createElement("tr");
var th=document.createElement("th");
th.textContent=key;
var td=document.createElement("td");
td.setAttribute("id","e_"+key);
td.innerHTML="0";
td.className="false";
tr.appendChild(th);
tr.appendChild(td);
if((i++%5)==0){
tbody.appendChild(tr);
tr=null;
}
}
if(tr!=null) tbody.appendChild(tr);
}
function init_properties(){
var tbody=document.getElementById("properties");
var i=0;
var tr=null;
media_properties_elts=new Array(media_properties.length);
do{
if(tr==null) tr=document.createElement("tr");
var th=document.createElement("th");
th.textContent=media_properties[i];
var td=document.createElement("td");
td.setAttribute("id","p_"+media_properties[i]);
var r=eval("document._video."+media_properties[i]);
td.innerHTML=r;
if(typeof(r)!="undefined"){
td.className="true";
}else{
td.className="false";
}
tr.appendChild(th);
tr.appendChild(td);
media_properties_elts[i]=td;
if((++i%3)==0){
tbody.appendChild(tr);
tr=null;
}
}while(i<media_properties.length);
if(tr!=null) tbody.appendChild(tr);
}
function init_mediatypes(){
var tbody=document.getElementById("m_video");
var i=0;
var tr=document.createElement("tr");
var videoTypes=[ "video/ogg","video/mp4","video/webm" ];
i=0;
tr=document.createElement("tr");
do{
var td=document.createElement("th");
td.innerHTML=videoTypes[i];
tr.appendChild(td);
}while(++i<videoTypes.length);
tbody.appendChild(tr);
i=0;
tr=document.createElement("tr");
if(!!document._video.canPlayType){
do{
var td=document.createElement("td");
var support=document._video.canPlayType(videoTypes[i]);
td.innerHTML='"'+support+'"';
if(support==="maybe"){
td.className="true";
}else if(support===""){
td.className="false";
}
tr.appendChild(td);
}while(++i<videoTypes.length);
tbody.appendChild(tr);
}
}
function capture(event){
media_events[event.type]=media_events[event.type]+1;
for(key in media_events){
var e=document.getElementById("e_"+key);
if(e){
e.innerHTML=media_events[key];
if(media_events[key]>0) e.className="true";
}
}
update_properties();
}
function update_properties(){
var i=0;
for(key in media_properties){
var val=eval("document._video."+media_properties[key]);
/*
if (typeof val === "TimesRanges") {
val = val.length + " TimeRanges";
}
*/
media_properties_elts[i++].innerHTML=val;
}
if(!!document._video.audioTracks){
var td=document.getElementById("m_audiotracks");
td.innerHTML=document._video.audioTracks.length;
td.className="true";
}
if(!!document._video.videoTracks){
var td=document.getElementById("m_videotracks");
td.innerHTML=document._video.videoTracks.length;
td.className="true";
}
if(!!document._video.textTracks){
var td=document.getElementById("m_texttracks");
td.innerHTML=document._video.textTracks.length;
td.className="true";
}
}
var videos=new Array();
videos[0]=[
"http://media.w3.org/2010/05/sintel/poster.png","http://media.w3.org/2010/05/sintel/trailer.mp4","http://media.w3.org/2010/05/sintel/trailer.ogv","http://media.w3.org/2010/05/sintel/trailer.webm"
];
videos[1]=[
"http://media.w3.org/2010/05/bunny/poster.png","http://media.w3.org/2010/05/bunny/trailer.mp4","http://media.w3.org/2010/05/bunny/trailer.ogv"
];
videos[2]=[
"http://media.w3.org/2010/05/bunny/poster.png","http://media.w3.org/2010/05/bunny/movie.mp4","http://media.w3.org/2010/05/bunny/movie.ogv"
];
videos[3]=[
"http://media.w3.org/2010/05/video/poster.png","http://media.w3.org/2010/05/video/movie_300.mp4","http://media.w3.org/2010/05/video/movie_300.ogv","http://media.w3.org/2010/05/video/movie_300.webm"
];
function switchVideo(n){
if(n>=videos.length) n=0;
var mp4=document.getElementById("mp4");
var ogv=document.getElementById("ogv");
var parent=ogv.parentNode;
document._video.setAttribute("poster",videos[n][0]);
mp4.setAttribute("src",videos[n][1]);
ogv.setAttribute("src",videos[n][2]);
if(videos[n][3]){
if(webm.parentNode==null){
parent.insertBefore(webm,ogv);
}
webm.setAttribute("src",videos[n][3]);
}else{
if(webm.parentNode!=null){
parent.removeChild(webm);
}
}
document._video.load();
}

这一段JS是从http://www.w3.org/2010/05/video/mediaevents.html拷贝而来，具体的演示就在这个页面了。我是想知道video标签中的一些事件。controller_event几乎用不到。中文说明这里有：http://directguo.com/blog/index.php/2010/07/html5-audio-video-tag/

XML/HTML代码

//错误状态
Media.error; //null:正常
Media.error.code; //1.用户终止 2.网络错误 3.解码错误 4.URL无效
//网络状态
Media.currentSrc; //返回当前资源的URL
Media.src = value; //返回或设置当前资源的URL
Media.canPlayType(type); //是否能播放某种格式的资源
Media.networkState; //0.此元素未初始化 1.正常但没有使用网络 2.正在下载数据 3.没有找到资源
Media.load(); //重新加载src指定的资源
Media.buffered; //返回已缓冲区域，TimeRanges
Media.preload; //none:不预载 metadata:预载资源信息 auto:
//准备状态
Media.readyState; //1:HAVE_NOTHING 2:HAVE_METADATA 3.HAVE_CURRENT_DATA 4.HAVE_FUTURE_DATA 5.HAVE_ENOUGH_DATA
Media.seeking; //是否正在seeking
//回放状态
Media.currentTime = value; //当前播放的位置，赋值可改变位置
Media.startTime; //一般为0，如果为流媒体或者不从0开始的资源，则不为0
Media.duration; //当前资源长度流返回无限
Media.paused; //是否暂停
Media.defaultPlaybackRate = value;//默认的回放速度，可以设置
Media.playbackRate = value;//当前播放速度，设置后马上改变
Media.played; //返回已经播放的区域，TimeRanges，关于此对象见下文
Media.seekable; //返回可以seek的区域 TimeRanges
Media.ended; //是否结束
Media.autoPlay; //是否自动播放
Media.loop; //是否循环播放
Media.play(); //播放
Media.pause(); //暂停
//控制
Media.controls;//是否有默认控制条
Media.volume = value; //音量
Media.muted = value; //静音
//TimeRanges(区域)对象
TimeRanges.length; //区域段数
TimeRanges.start(index) //第index段区域的开始位置
TimeRanges.end(index) //第index段区域的结束位置

借鉴一下。

标签: html5, video, audio

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