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38 KiB
HTML
70 lines
38 KiB
HTML
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<link rel="icon" href="/bilibili-API-collect/logo2.jpg"><title>智能防挡弹幕 | BAC Document</title><meta name="description" content="社区开源的第三方哔哩哔哩 API 文档">
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target="_blank"><!--[--><!--[--><!--]--><!--]-->Telegram交流群（Github Bot推送）<!--[--><!--[--><!--]--><!--]--></a></li><!--]--></ul></div></div><div class="vp-navbar-item"><a class="auto-link external-link" href="https://github.com/SocialSisterYi/bilibili-API-collect" aria-label="GitHub" rel="noopener noreferrer" target="_blank"><!--[--><!--[--><!--]--><!--]-->GitHub<!--[--><!--[--><!--]--><!--]--></a></div><!--]--></nav><!--[--><!--]--><ul class="vp-sidebar-items"><!--[--><li><p tabindex="0" class="vp-sidebar-item vp-sidebar-heading">智能防挡弹幕 <!----></p><!----></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="vp-page"><!--[--><!--]--><div vp-content><!--[--><!--]--><div id="content"><h1 id="智能防挡弹幕" tabindex="-1"><a class="header-anchor" href="#智能防挡弹幕"><span>智能防挡弹幕</span></a></h1><p>B 站部分视频提供“智能防挡弹幕”功能，其原理是提供了一个 webmask 二进制文件，其中保存了视频中各个位置的 svg 格式蒙版。</p><p>首先需要获取 webmask 资源的地址。</p><h2 id="获取-webmask-资源地址" tabindex="-1"><a class="header-anchor" href="#获取-webmask-资源地址"><span>获取 webmask 资源地址</span></a></h2><p>通过 <a class="route-link" href="/bilibili-API-collect/docs/video/player.html">web 播放器资源接口</a> 获取 webmask 二进制文件的地址。</p><h2 id="webmask-资源" tabindex="-1"><a class="header-anchor" href="#webmask-资源"><span>webmask 资源</span></a></h2><p>获取的 url 没有权鉴，不需要后面的参数也可以获取。</p><p>示例：</p><div class="language-shell line-numbers-mode" data-highlighter="shiki" data-ext="shell" style="background-color:#1E1E1E;color:#D4D4D4;"><pre class="shiki dark-plus vp-code"><code class="language-shell"><span class="line"><span style="color:#DCDCAA;">curl</span><span style="color:#569CD6;"> -G</span><span style="color:#CE9178;"> https://upos-sz-staticcos-cmask.bilivideo.com/cmaskboss/825851971_30_0.webmask</span><span style="color:#D4D4D4;"> >> </span><span style="color:#CE9178;">825851971_30_0.webmask</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div></div></div><p>下载后是二进制文件。</p><h2 id="webmask-二进制读取" tabindex="-1"><a class="header-anchor" href="#webmask-二进制读取"><span>webmask 二进制读取</span></a></h2><p>参考：<a href="https://github.com/andrewvy/webmask-renderer" target="_blank" rel="noopener noreferrer">andrewvy/webmask-renderer</a></p><table><thead><tr><th>name</th><th>offset</th><th>length</th><th>type</th><th>desc</th></tr></thead><tbody><tr><td>mask</td><td>0</td><td>4</td><td>char</td><td>'MASK' 文件头</td></tr><tr><td>version</td><td>4</td><td>4</td><td>int</td><td>是1</td></tr><tr><td>vU</td><td>8</td><td>4</td><td>?</td><td>不知道是干什么的</td></tr><tr><td>Ly</td><td>12</td><td>4</td><td>int</td><td>后续数据的段数</td></tr><tr><td>time_1</td><td>16</td><td>8</td><td>long</td><td>第一段对应视频开始时间</td></tr><tr><td>offset_1</td><td>24</td><td>8</td><td>long</td><td>第一段蒙版信息开始处对应二进制偏移</td></tr><tr><td>...</td><td>...</td><td>...</td><td>...</td><td>...</td></tr><tr><td>time_{Ly}</td><td>16+(Ly-1)*16</td><td>8</td><td>long</td><td>第 <code>Ly</code> 段对应视频开始时间</td></tr><tr><td>offset_{Ly}</td><td>24+(Ly-1)*16</td><td>8</td><td>long</td><td>第 <code>Ly</code> 段蒙版信息开始处对应二进制偏移</td></tr><tr><td>segments_1</td><td>由前面offset_1提供</td><td>由 <code>offset_2-offset_1</code> 计算得到</td><td>binary</td><td>蒙版信息块，使用 gzip 压缩</td></tr><tr><td>...</td><td>...</td><td>...</td><td>...</td><td>...</td></tr></tbody></table><p>蒙版信息块是经过 gzip 压缩文本得到的二进制。解压缩后得到一个字节串。</p><p>前 16 字节是两个 long，记为 <code>left</code> 和 <code>right</code>，暂时不清楚其作用。<code>left</code> 似乎和平均每张蒙版的时间有关。<code>right</code> 总是 <code>i*10000</code>，<code>i</code> 是从 0 开始数的数据段次序。</p><p>后面是各个 svg 文本直接拼起来，可以直接通过 svg 格式头 <code>data:image/svg+xml;base64,</code> 分开。</p><p>Python 示例：</p><div class="language-python line-numbers-mode" data-highlighter="shiki" data-ext="python" style="background-color:#1E1E1E;color:#D4D4D4;"><pre class="shiki dark-plus vp-code"><code class="language-python"><span class="line"><span style="color:#C586C0;">from</span><span style="color:#D4D4D4;"> struct </span><span style="color:#C586C0;">import</span><span style="color:#D4D4D4;"> unpack</span></span>
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<span class="line"><span style="color:#C586C0;">import</span><span style="color:#D4D4D4;"> gzip</span></span>
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<span class="line"></span>
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<span class="line"><span style="color:#D4D4D4;">f = </span><span style="color:#DCDCAA;">open</span><span style="color:#D4D4D4;">(</span><span style="color:#CE9178;">'你的 webmask'</span><span style="color:#D4D4D4;">, </span><span style="color:#CE9178;">'rb'</span><span style="color:#D4D4D4;">)</span></span>
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<span class="line"><span style="color:#D4D4D4;">buf = f.read()</span></span>
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<span class="line"><span style="color:#D4D4D4;">_Ly = buf[</span><span style="color:#B5CEA8;">12</span><span style="color:#D4D4D4;">:</span><span style="color:#B5CEA8;">16</span><span style="color:#D4D4D4;">]</span></span>
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<span class="line"><span style="color:#D4D4D4;">Ly = unpack(</span><span style="color:#CE9178;">'>i'</span><span style="color:#D4D4D4;">, _Ly)[</span><span style="color:#B5CEA8;">0</span><span style="color:#D4D4D4;">] </span><span style="color:#6A9955;"># 大端序 int</span></span>
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<span class="line"></span>
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<span class="line"><span style="color:#D4D4D4;">times = []</span></span>
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<span class="line"><span style="color:#D4D4D4;">offsets = []</span></span>
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<span class="line"><span style="color:#C586C0;">for</span><span style="color:#D4D4D4;"> idx </span><span style="color:#C586C0;">in</span><span style="color:#DCDCAA;"> range</span><span style="color:#D4D4D4;">(Ly):</span></span>
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<span class="line"><span style="color:#D4D4D4;"> op = </span><span style="color:#B5CEA8;">16</span><span style="color:#D4D4D4;"> + idx * </span><span style="color:#B5CEA8;">16</span><span style="color:#6A9955;"> # 个人习惯，我算偏移时喜欢用 `op` 和 `ed` 作为开始和结束的名字。</span></span>
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<span class="line"><span style="color:#D4D4D4;"> time = unpack(</span><span style="color:#CE9178;">'>q'</span><span style="color:#D4D4D4;">, buf[op: op+</span><span style="color:#B5CEA8;">8</span><span style="color:#D4D4D4;">])[</span><span style="color:#B5CEA8;">0</span><span style="color:#D4D4D4;">]</span></span>
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<span class="line"><span style="color:#D4D4D4;"> offset = unpack(</span><span style="color:#CE9178;">'>q'</span><span style="color:#D4D4D4;">, buf[op+</span><span style="color:#B5CEA8;">8</span><span style="color:#D4D4D4;">: op+</span><span style="color:#B5CEA8;">16</span><span style="color:#D4D4D4;">])[</span><span style="color:#B5CEA8;">0</span><span style="color:#D4D4D4;">]</span></span>
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<span class="line"><span style="color:#D4D4D4;"> times.append(time)</span></span>
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<span class="line"><span style="color:#D4D4D4;"> offsets.append(offset)</span></span>
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<span class="line"></span>
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<span class="line"><span style="color:#D4D4D4;">frames = []</span></span>
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<span class="line"><span style="color:#C586C0;">for</span><span style="color:#D4D4D4;"> idx </span><span style="color:#C586C0;">in</span><span style="color:#DCDCAA;"> range</span><span style="color:#D4D4D4;">(Ly):</span></span>
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<span class="line"><span style="color:#D4D4D4;"> op = offsets[idx]</span></span>
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<span class="line"><span style="color:#C586C0;"> if</span><span style="color:#D4D4D4;"> idx == Ly - </span><span style="color:#B5CEA8;">1</span><span style="color:#D4D4D4;">: ed = </span><span style="color:#DCDCAA;">len</span><span style="color:#D4D4D4;">(buf)</span></span>
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<span class="line"><span style="color:#C586C0;"> else</span><span style="color:#D4D4D4;">: ed = offsets[idx+</span><span style="color:#B5CEA8;">1</span><span style="color:#D4D4D4;">]</span></span>
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<span class="line"><span style="color:#D4D4D4;"> ba = buf[op: ed]</span></span>
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<span class="line"><span style="color:#D4D4D4;"> bad = gzip.decompress(ba)</span></span>
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<span class="line"><span style="color:#D4D4D4;"> badl = bad.split(</span><span style="color:#569CD6;">b</span><span style="color:#CE9178;">'data:image/svg+xml;base64,'</span><span style="color:#D4D4D4;">)</span></span>
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<span class="line"><span style="color:#6A9955;"> # badl[0]是16字节，`left` 和 `right`</span></span>
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<span class="line"><span style="color:#D4D4D4;"> frames.append(badl[</span><span style="color:#B5CEA8;">1</span><span style="color:#D4D4D4;">: ])</span></span></code></pre><div class="line-numbers" aria-hidden="true" style="counter-reset:line-number 0;"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div></div><!--[--><!--]--></div><footer class="vp-page-meta"><div class="vp-meta-item edit-link"><a class="auto-link external-link label" href="https://github.com/SocialSisterYi/bilibili-API-collect/edit/master/docs/danmaku/webmask.md" aria-label="在 GitHub 上编辑此页" rel="noopener noreferrer" target="_blank"><!--[--><!--[--><svg class="edit-icon" viewbox="0 0 1024 1024"><g fill="currentColor"><path d="M430.818 653.65a60.46 60.46 0 0 1-50.96-93.281l71.69-114.012 7.773-10.365L816.038 80.138A60.46 60.46 0 0 1 859.225 62a60.46 60.46 0 0 1 43.186 18.138l43.186 43.186a60.46 60.46 0 0 1 0 86.373L588.879 565.55l-8.637 8.637-117.466 68.234a60.46 60.46 0 0 1-31.958 11.229z"></path><path d="M728.802 962H252.891A190.883 190.883 0 0 1 62.008 771.98V296.934a190.883 190.883 0 0 1 190.883-192.61h267.754a60.46 60.46 0 0 1 0 120.92H252.891a69.962 69.962 0 0 0-69.098 69.099V771.98a69.962 69.962 0 0 0 69.098 69.098h475.911A69.962 69.962 0 0 0 797.9 771.98V503.363a60.46 60.46 0 1 1 120.922 0V771.98A190.883 190.883 0 0 1 728.802 962z"></path></g></svg><!--]--><!--]-->在 GitHub 上编辑此页<!--[--><!--[--><!--]--><!--]--></a></div><div class="vp-meta-item git-info"><div class="vp-meta-item last-updated"><span class="meta-item-label">最近更新: </span><time class="meta-item-info" datetime="2024-05-05T06:06:23.000Z" data-allow-mismatch>2024/5/5 06:06</time></div><div class="vp-meta-item contributors"><span class="meta-item-label">Contributors: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: 45134013+holazzer@users.noreply.github.com">holazzer</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: z0z0r4@outlook.com">z0z0r4</span><!----><!--]--><!--]--></span></div></div></footer><!----><!--[--><!--[--><footer style="text-align:center;"> Copyright © 2020-2025 <a href="https://github.com/SocialSisterYi/">SocialSisterYi</a> | <a href="https://github.com/SocialSisterYi/bilibili-API-collect/blob/master/LICENSE">CC-BY-NC-4.0 Licensed</a></footer><!--]--><!--]--></main><!--]--></div><!--[--><!----><!--]--><!--]--></div>
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