读取FLAC音频长度添加视频分段信息

add_cards.user.js

// ==UserScript==
// @name        音频->分段
// @namespace   Violentmonkey Scripts
// @match       https://www.bilibili.com/video/*
// @grant       none
// @version     1.0
// @author      -
// @description 2022/7/27 11:52:53
// ==/UserScript==

(async () => {
    const readFLACDuration = async (file) => {
        return new Promise((resolve) => {
            const reader = new FileReader();
            reader.addEventListener("load", () => {
                const temp = new Uint8Array(reader.result.slice(18, 21));
                const sampleRate =
                    (temp[0] << 12) | (temp[1] << 4) | (temp[2] >>> 4);
                const temp2 = new Uint8Array(reader.result.slice(0x15, 0x1a));
                temp2[0] = temp2[0] & 0b00001111;
                const totalSamples =
                    (temp2[0] << 32) |
                    (temp2[1] << 24) |
                    (temp2[2] << 16) |
                    (temp2[3] << 8) |
                    temp2[4];
                resolve(Math.round(totalSamples / sampleRate));
            });
            reader.readAsArrayBuffer(file);
        });
    };

    window.addCards = async () => {
        const aid = window.aid;
        const cid = window.cid;
        const videoLength = window.__INITIAL_STATE__.videoData.duration;
        const csrf = document.cookie.match(/bili_jct=(.+?);/)[1];
        const titles = [];
        const lengths = [];
        const cards = [];
        let counter = 0;
        const fileInput = document.createElement("input");
        fileInput.type = "file";
        fileInput.multiple = true;
        fileInput.addEventListener("change", async () => {
            if (fileInput?.files?.length) {
                for (const file of fileInput.files) {
                    const duration = await readFLACDuration(file);
                    titles.push(file.name.split(".").slice(0, -1).join(""));
                    lengths.push(duration);
                }
                titles.forEach((title, index) => {
                    cards.push({
                        from: counter,
                        to:
                            index === titles.length - 1
                                ? videoLength
                                : counter + lengths[index],
                        content: title,
                    });
                    counter += lengths[index];
                });
                console.log(cards);
                await fetch("https://member.bilibili.com/x/web/card/submit", {
                    method: "POST",
                    mode: "cors",
                    credentials: "include",
                    headers: {
                        "Content-Type": "application/x-www-form-urlencoded",
                    },
                    body: new URLSearchParams({
                        aid,
                        cid,
                        csrf,
                        cards: JSON.stringify(cards),
                        type: 2,
                        permanent: true,
                    }),
                });
            }
        });
        fileInput.click();
    };
})();