A Javascript API works with MediaInfoLib.
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/377671/670848/MediaInfoOnlinejs.js
// ==UserScript==
// @name MediaInfoOnline.js
// @namespace http://tampermonkey.net/
// @version 0.1
// @description A Javascript API works with MediaInfoLib.
// @author You
// @match *
// @require https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js
// @grant none
// ==/UserScript==
var $ = window.jQuery;
window.MediaInfoOnline = function(input_resource, textarea_mediainfo, input_mediainfo, span_mediainfo, select_format){
var MediaInfo_lib_instance;
var result;
var key;
var processing = false;
var keyToParse = 1024 * 1024;
var cueIn = function(){
MediaInfo_lib_instance = MediaInfoLib({
'locateFile': ()=>'',
'postRun': function(){
initializeAll();
}
});
};
var fadeInThenFadeOut = function(span_mediainfo, content, time, color){
span_mediainfo.text(content).css('color', color).fadeIn(function(){
$(this).delay(time).fadeOut(function(){
span_mediainfo.text('');
});
});
}
var initializeAll = function(){
$(document).ready(function(){
var output_formats = JSON.parse(MediaInfo_lib_instance.MediaInfo.Option_Static('Info_OutputFormats_JSON'));
$.each(output_formats.output, function(e, a){
select_format.append(
$('<option/>', {
value: a.name,
mime: a.mime
}).text(a.desc)
);
});
input_resource.prop('disabled', false);
DOMEventInit();
});
};
var DOMEventInit = function(){
input_resource.on('change', function(){
var input_resource_DOM = $(this)[0];
if(input_resource_DOM.files.length > 0){
startParseMediaInfo(input_resource_DOM.files[0]);
}
});
select_format.on('change', function(){
if(processing){
input_mediainfo.prop('disabled', true);
input_mediainfo.attr('value', '稍等');
regenByType($(this).val(), $(this).find(':selected').attr('mime'));
}
});
input_mediainfo.on('click', function(e){
e.preventDefault();
textarea_mediainfo[0].select();
try{
var successful = document.execCommand('copy');
var msg = successful?{'text': '成功', 'color': '#2276BB'}:{'text': '失败', 'color': '#DD8944'};
fadeInThenFadeOut(span_mediainfo, 'MediaInfo复制' + msg.text, 500, msg.color);
}
catch(error){
fadeInThenFadeOut(span_mediainfo, '无法复制MediaInfo', 500, '#DD8944');
}
})
}
var regenByType = function(type, mime){
result.Option('Inform', 'JSON');
window.MediaInfoOnline.json = JSON.parse(result.Inform().trim());
result.Option('Inform', type);
input_mediainfo.attr('value', '复制');
render(mime);
input_mediainfo.prop('disabled', false);
};
var render = function(mime){
textarea_mediainfo.text(result.Inform().trim());
};
var startParseMediaInfo = function(file){
if(processing){
processingDone();
}
try{
parseFile(file);
}
catch(error){
alert('Your browser is not compatible.');
}
};
var processingDone = function(){
result.Close();
result.delete;
processing = false;
input_mediainfo.prop('disabled', false);
input_mediainfo.attr('value', '复制');
};
var parseFile = function(file){
if(processing){
return;
}
input_mediainfo.prop('disabled', true);
input_mediainfo.attr('value', '稍等');
processing = true;
key = file.name;
var offset = 0;
result = new MediaInfo_lib_instance.MediaInfo;
result.Option('File_FileName', file.name);
result.Open_Buffer_Init(file.size, 0);
var seek = function(length){
if(processing){
var reader = new FileReader;
var b = file.slice(offset, offset + length);
reader.onload = processChunk;
reader.readAsArrayBuffer(b);
}
else{
processingDone();
}
};
var processChunk = function(event){
if(event.target.error === null){
try{
var m = result.Open_Buffer_Continue(event.target.result);
}
catch(error){
processingDone();
alert('An error happened reading your file.');
return;
}
var next_position = result.Open_Buffer_Continue_Goto_Get();
if(next_position === -1){
offset = offset + event.target.result.byteLength;
}
else{
offset = next_position;
result.Open_Buffer_Init(file.size, next_position);
}
}
else{
processingDone();
alert('An error happened reading your file.');
return;
}
if(m & 8 || event.target.result.byteLength < 1){
result.Open_Buffer_Finalize();
regenByType(select_format.val(), select_format.find(':selected').attr('mime'));
input_mediainfo.prop('disabled', false);
input_mediainfo.attr('value', '复制');
return;
}
seek(keyToParse);
};
seek(keyToParse);
};
return {
init: cueIn
};
}