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MediaInfoOnline.js

A Javascript API works with MediaInfoLib.

Verzia zo dňa 15.02.2019. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greatest.deepsurf.us/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
    };
}