Use Mediainfo.js for Biu

use_mediainfo_for_biu.user.js

// ==UserScript==
// @name        Use Mediainfo.js for Biu
// @namespace   Violentmonkey Scripts
// @match       https://web.biu.moe/Upload
// @grant       none
// @version     1.0
// @author      -
// @description 2020/2/25 下午9:57:36
// ==/UserScript==
(() => {
    const CHUNK_SIZE = 5 * 1024 * 1024;
    const mediainfoScriptNode = document.createElement("script");
    mediainfoScriptNode.src = "https://hello-happy-1251149766.cos.ap-beijing.myqcloud.com/mediainfo.js";
    document.querySelector('head').appendChild(mediainfoScriptNode);
    mediainfoScriptNode.addEventListener("load", () => {
        let processing;
        console.log('Mediainfo.js loaded');
        const miLib = MediaInfo(() => {
            console.log('Mediainfo.js ready');
            mi = new miLib.MediaInfo();
            function parseFile(file) {
                return new Promise((resolve) => {
                    if (processing) {
                        return;
                    }
                    processing = true;
    
                    var fileSize = file.size, offset = 0, state = 0, seekTo = -1, seek = null;
    
                    mi.open_buffer_init(fileSize, offset);
    
                    var processChunk = function (e) {
                        var l;
                        if (e.target.error === null) {
                            var chunk = new Uint8Array(e.target.result);
                            l = chunk.length;
                            state = mi.open_buffer_continue(chunk, l);
    
                            var seekTo = -1;
                            var seekToLow = mi.open_buffer_continue_goto_get_lower();
                            var seekToHigh = mi.open_buffer_continue_goto_get_upper();
    
                            if (seekToLow == -1 && seekToHigh == -1) {
                                seekTo = -1;
                            } else if (seekToLow < 0) {
                                seekTo = seekToLow + 4294967296 + (seekToHigh * 4294967296);
                            } else {
                                seekTo = seekToLow + (seekToHigh * 4294967296);
                            }
    
                            if (seekTo === -1) {
                                offset += l;
                            } else {
                                offset = seekTo;
                                mi.open_buffer_init(fileSize, seekTo);
                            }
                            chunk = null;
                        } else {
                            var msg = 'An error happened reading your file!';
                            console.err(msg, e.target.error);
                            processingDone();
                            alert(msg);
                            return;
                        }
                        // bit 4 set means finalized
                        if (state & 0x08) {
                            var result = mi.inform();
                            mi.close();
                            resolve(result);
                            processingDone();
                            return;
                        }
                        seek(l);
                    };
    
                    function processingDone() {
                        processing = false;
                    }
    
                    seek = function (length) {
                        if (processing) {
                            var r = new FileReader();
                            var blob = file.slice(offset, length + offset);
                            r.onload = processChunk;
                            r.readAsArrayBuffer(blob);
                        }
                        else {
                            mi.close();
                            processingDone();
                        }
                    };
                    // start
                    seek(CHUNK_SIZE);
                })
            }
            
          
            const getTag = (text, tagName) => {
              const regexp = new RegExp(`<${tagName}>(.+)<\/${tagName}>`, 'i');
              if (text.match(regexp)) {
                return text.match(regexp)[1].trim();
              }
              return undefined;
            }
            // 替换函数
            const _go2 = unsafeWindow.go2;
            unsafeWindow.go2 = async (file) => {
                $('#nowfile').text(file.name);
                $('#info11').slideDown();
                const r = await parseFile(file);
                $('#info11').slideUp();
                $('#info2').slideDown();
                $('#info1').append(' 格式：' + getTag(r, 'format'));
                $('#info1').append(' 码率：' + getTag(r, 'bit_rate'));
                $('#title').attr('value', getTag(r, 'track_name'));
                $('#singer').attr('value', getTag(r, 'performer') || getTag(r, 'display_artist') || getTag(r, 'albumartist'));
                $('#album').attr('value', getTag(r, 'album'));
            };
        });
    })
})()