biliob/src/main/java/com/yutou/bilibili/Tools/AssTools.java

package com.yutou.bilibili.Tools;

import com.yutou.bilibili.BiliBili.Datas.DanmuData;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class AssTools {
    private final StringBuilder builder;
    private final Date startTime;
    private int y = 0;
    private List<String> filters = new ArrayList<>();
    private String alpha="80";

    /**
     * 弹幕转换ass
     * @param title 标题
     * @param startTime 录像起始时间
     */
    public AssTools(String title, Date startTime) {
        builder = new StringBuilder();
        this.startTime = startTime;
        initAssHeader(title);
    }

    /**
     * 弹幕过滤器
     * @param filter 过滤词
     */
    public void addFilter(String... filter) {
        filters.addAll(Arrays.asList(filter));
    }

    /**
     * 弹幕透明度
     * @param alpha 0 完全不透明 255 完全透明
     */
    public void setAlpha(int alpha){
        this.alpha=Integer.toHexString(alpha);
    }
    private void addBuilder(String txt) {
        builder.append(txt).append("\n");
    }

    private void initAssHeader(String title) {
        addBuilder("[Script Info]");
        addBuilder("Title: " + title);
        addBuilder("Original Script: 本字幕由@yutou生成");
        addBuilder("ScriptType: v4.00+");
        addBuilder("Collisions: Normal");
        addBuilder("PlayResX: 1920");
        addBuilder("PlayResY: 1080");
        addBuilder("Timer: 10.0000");
        addBuilder("");
        addBuilder("[V4+ Styles]");
        addBuilder("Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, ");
        addBuilder("MarginL, MarginR, MarginV, Encoding");
        addBuilder("Style: Fix,Microsoft YaHei UI,45,&H66FFFFFF,&H66FFFFFF,&H66000000,&H66000000,1,0,0,0,100,100,0,0,1,2,0,2,20,20,2,0");
        addBuilder("Style: R2L,Microsoft YaHei UI,45,&H66FFFFFF,&H66FFFFFF,&H66000000,&H66000000,1,0,0,0,100,100,0,0,1,2,0,2,20,20,2,0");
        addBuilder("");
        addBuilder("[Events]");
        addBuilder("Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text");
    }

    /**
     * 保存弹幕文件
     * @param savePath 存储路径
     * @return 存储结果
     */
    public boolean saveDanmu(String savePath) {
        System.out.println("savePath = " + savePath);
        File file = new File(savePath);
        try {
            if (file.exists()) {
                if (!file.delete()) {
                    return false;
                }
            }
            boolean mkdirs = file.mkdirs();
            boolean delete = file.delete();
            if (!mkdirs || !delete) {
                return false;
            }
            if (!file.createNewFile()) {
                return false;
            }
            FileWriter writer = new FileWriter(file);
            writer.write(builder.toString());
            writer.flush();
            writer.close();
            return true;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return false;
    }

    /**
     * 添加弹幕
     * @param danmuData 弹幕
     */
    public void addDanmu(DanmuData danmuData) {
        if (filters.contains(danmuData.getDanmu())) {
            return;
        }
        addY();
        long _time = (danmuData.getTime() - startTime.getTime());
        long h = TimeUnit.MILLISECONDS.toHours(_time);
        long m = TimeUnit.MILLISECONDS.toMinutes(_time) % 60;
        long s = TimeUnit.MILLISECONDS.toSeconds(_time) % 60;
        String sTime = String.format("%s:%s:%s.0",
                new DecimalFormat("00").format(h),
                new DecimalFormat("00").format(m),
                new DecimalFormat("00").format(s));
        if (s >= 52) {
            s = (s + 8) - 60;
            m++;
        } else {
            s += 8;
        }
        String eTime = String.format("%s:%s:%s.0",
                new DecimalFormat("00").format(h),
                new DecimalFormat("00").format(m),
                new DecimalFormat("00").format(s));
        float x1, x2;
        x1 = 1920 + (danmuData.getDanmu().length() * 12.5f);
        x2 = 0 - (danmuData.getDanmu().length() * 12.5f);

        String ass = String.format("Dialogue: 0,%s,%s,R2L,,20,20,2,,{\\move(%.1f,%d,%.1f,%d)\\c&%s\\alpha&H%s}%s",
                sTime,
                eTime,
                x1,
                y,
                x2,
                y,
                danmuData.getFontColorHex(),
                alpha,
                danmuData.getDanmu()
        );
        addBuilder(ass);
    }


    private void addY() {
        y += 30;
        if (y >= 1080) {
            y = 30;
        }
    }

}