1 files changed, 32 insertions, 0 deletions
diff --git a/assets/js/stella.js b/assets/js/stella.js
new file mode 100644
index 0000000..aa6bbaa
--- /dev/null
+++ b/assets/js/stella.js
@@ -0,0 +1,32 @@
+class Stella {
+    arrayBuffer;
+    metadata;
+    stems;
+
+    constructor(ab) {
+        this.arrayBuffer = ab;
+        this.metadata = JSON.parse(new TextDecoder("utf-8").decode(pako.inflateRaw(ab.slice(8, 512))).trim());
+        this.stems = {};
+        this.urls = {};
+
+        for (let stem of Object.keys(this.metadata.stems)) {
+            this.stems[stem] = pako.inflateRaw(ab.slice(this.metadata.stems[stem][0], this.metadata.stems[stem][0] + this.metadata.stems[stem][1]));
+            this.urls[stem] = URL.createObjectURL(new Blob([this.stems[stem]], { type: "audio/flac" }));
+        }
+    }
+
+    destroy() {
+        for (let url of Object.values(this.urls)) {
+            URL.revokeObjectURL(url);
+        }
+
+        this.urls = null;
+        this.stems = null;
+        this.arrayBuffer = null;
+    }
+
+    static async build(url) {
+        let buffer = await (await fetch(url)).arrayBuffer();
+        return new Stella(buffer);
+    }
+}
+\ No newline at end of file