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node_modules/prism-media/src/vorbis/WebmDemuxer.js

@@ -0,0 +1,22 @@
+const WebmBaseDemuxer = require('../core/WebmBase');
+
+const VORBIS_HEAD = Buffer.from([...'vorbis'].map(x => x.charCodeAt(0)));
+
+/**
+ * Demuxes a Webm stream (containing Vorbis audio) to output a Vorbis stream.
+ * @memberof vorbis
+ * @extends core.WebmBaseDemuxer
+ */
+class WebmDemuxer extends WebmBaseDemuxer {
+  _checkHead(data) {
+    if (data.readUInt8(0) !== 2 || !data.slice(4, 10).equals(VORBIS_HEAD)) {
+      throw Error('Audio codec is not Vorbis!');
+    }
+
+    this.push(data.slice(3, 3 + data.readUInt8(1)));
+    this.push(data.slice(3 + data.readUInt8(1), 3 + data.readUInt8(1) + data.readUInt8(2)));
+    this.push(data.slice(3 + data.readUInt8(1) + data.readUInt8(2)));
+  }
+}
+
+module.exports = WebmDemuxer;