bilidl

download bilibili DASH videos as fast as possible
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// ==UserScript==
// @name                 bilidl
// @name:zh-CN           bilidl
// @namespace            https://tampermonkey.net/
// @version              0.1.1
// @description          download bilibili DASH videos as fast as possible
// @description:zh-CN    B站DASH流视频下载
// @author               shiroikoi
// @match                https://www.bilibili.com/bangumi/play/*
// @match                https://www.bilibili.com/video/*
// @grant                none
// @run-at               document-idle
// @require              https://cdn.jsdelivr.net/npm/[email protected]/dist/vue.min.js
// @require              https://unpkg.com/@ffmpeg/[email protected]/dist/ffmpeg.min.js
// @require              https://cdnjs.cloudflare.com/ajax/libs/jquery/1.7.2/jquery.min.js
// @compatible           firefox >=52
// @compatible           chrome >=57
// @license              MIT
// ==/UserScript==

(function () {
    'use strict';
    let controller, fileName, dataObj, qualityList, videoList;
    let span = document.createElement("span"),
        option = document.createElement("option"),
        div = document.createElement("div"),
        select = document.createElement("select"),
        button = document.createElement("button");
    let loop = function (i) {
        if ($(i)[0] === undefined) {
            setTimeout(() => {
                loop(i);
            }, 1000)
        } else {
            fileName = $(i)[0].textContent
        }
    }

    if ($(".special-cover")[0] != undefined) {
        div.style.position = "absolute"
    }
    div.style.marginLeft = "137.667px"
    button.style.width = "90px"
    button.style.height = "49px"
    button.style.fontSize = "20px"
    select.style.fontSize = "20px"
    select.style.height = "45px"
    select.style.width = "320px"
    span.style.fontSize = "20px"
    button.setAttribute("v-on:click", "click")
    option.setAttribute("v-for", "i in options")
    button.textContent = "{{text}}"
    option.textContent = "{{ i }}"
    span.textContent = "{{text}}"

    if (window.location.href.match(/video/)) {
        $("#video-page-app")[0].after(div)
        div.prepend(select)
        select.after(button)
        select.prepend(option)
        button.after(span)
        loop(".tit")
    } else if (window.location.href.match(/bangumi/)) {
        $("#app")[0].before(div)
        div.prepend(select)
        select.after(button)
        select.prepend(option)
        button.after(span)
        loop(".bilibili-player-video-top-title")
    }

    //merge
    const ffWorker = FFmpeg.createWorker();
    (async function () { await ffWorker.load() })()
    let mergeVideo = async (video, audio) => {
        await ffWorker.write('video.mp4', video)
        await ffWorker.write('audio.mp4', audio)
        await ffWorker.run('-i video.mp4 -i audio.mp4 -c copy output.mp4', {
            input: ['video.mp4', 'audio.mp4'],
            output: 'output.mp4'
        })
        let data = await ffWorker.read('output.mp4')
        await ffWorker.remove('output.mp4')
        return data
    }

    let statVm = new Vue({
        el: span,
        data: {
            text: ""
        }
    })

    let buttVm = new Vue({
        el: button,
        data: {
            text: "下载",
            signal: false
        },
        methods: {
            click: function () {
                if (buttVm.signal === false) {
                    controller = new AbortController();
                    this.signal = true
                    this.stat2()
                    for (let i = 0; i < seleVm.$el.length; i++) {
                        let s = seleVm.$el[i]
                        if (s.selected === true) {
                            this.download(i)
                        }
                    }
                } else {
                    //abort
                    this.signal = false
                    controller.abort()
                    this.stat1()
                    statVm.text = " 已取消!"
                }
            },
            download: async function (i) {
                try {
                    let resV = await fetch(videoList[i].baseUrl.replace("http:", "https:"), { signal: controller.signal })
                    let resA = await fetch(dataObj.dash.audio[0].baseUrl.replace("http:", "https:"), { signal: controller.signal })
                    const readerV = resV.body.getReader()
                    const readerA = resA.body.getReader()
                    const VcontentLength = resV.headers.get('Content-Length')
                    const AcontentLength = resA.headers.get('Content-Length')
                    const totalLength = ((parseInt(VcontentLength) + parseInt(AcontentLength)) / (1024 * 1024)).toFixed(2);
                    let receivedLength = 0;
                    let vchunks = [];
                    let achunks = [];
                    //fetch progress
                    while (true) {
                        const { done, value } = await readerV.read()
                        if (done) {
                            break;
                        }
                        vchunks.push(value)
                        receivedLength += value.length;
                        statVm.text = ` 已下载:${(parseFloat(receivedLength) / 1024 / 1024).toFixed(2)}MiB 预计总:${totalLength}MiB`
                    }
                    while (true) {
                        const { done, value } = await readerA.read()
                        if (done) {
                            break;
                        }
                        achunks.push(value)
                        receivedLength += value.length;
                        statVm.text = ` 已下载:${(parseFloat(receivedLength) / 1024 / 1024).toFixed(2)}MiB 预计总:${totalLength}MiB`
                    }
                    let vblob = new Blob(vchunks)
                    let ablob = new Blob(achunks)
                    statVm.text = ` 合并中... 预计总:${totalLength}MiB`
                    let result = await mergeVideo(vblob, ablob)
                    let blob = new Blob([result.data])
                    let dl = document.createElement("a")
                    dl.download = `${fileName}.mp4`
                    dl.href = URL.createObjectURL(blob)
                    dl.click()
                    URL.revokeObjectURL(dl.href)
                    dl.remove()
                    statVm.text = ` 合并完成! 总:${totalLength}MiB`
                    this.stat1()
                    this.signal = false
                } catch (err) {
                    console.log(err.name)
                    if (err.name != "AbortError") { statVm.text = " 发生错误! 请重试" }
                    this.stat1() 
                }
            },
            stat1: function () {
                this.text = "下载";
                this.$el.style.backgroundColor = ""
            },
            stat2: function () {
                this.text = "取消"
                this.$el.style.backgroundColor = "#99ccff"
            }
        }
    })

    try {
        // parse url
        for (let i = 0; i < document.querySelectorAll("script").length; i++) {
            if (/^window.__playinfo__/.test(document.querySelectorAll("script")[i].innerText)) {
                dataObj = JSON.parse(document.querySelectorAll("script")[i].innerText.replace("window.__playinfo__=", "")).data
                break
            }
        }
        qualityList = [];
        videoList = dataObj.dash.video;
        videoList.forEach((item, index) => {
            let fps
            if (item.id == 116 || item.id == 74) {
                fps = "60"
            } else { fps = "" }
            qualityList[index] = item.height + "p" + fps + " " + item.mimeType.replace(/....../, "") + "-" + item.codecs
        });
    } catch (err) {
        //error when parsing premium video with non-premium account or getting network issue
        statVm.text = " 解析错误! 请尝试刷新页面";
        buttVm.$el.disabled = true
    }

    let optionsList = { options: qualityList }
    let seleVm = new Vue({
        el: select,
        data: optionsList
    })
})();