diff --git a/src/transform.zig b/src/transform.zig
index 113fd0a..8d85a9c 100644
--- a/src/transform.zig
+++ b/src/transform.zig
@@ -55,10 +55,20 @@ fn gen_coeffs() [8][8]@Vector(64, f16) {
 }
 
 pub fn quantize(source: *util.Block, target: *util.BlockQuantized, qtable: *util.QTable) void {
-    _ = qtable;
-    _ = target;
-    var holder: @Vector(64, f16) = undefined;
+    var source_holder: @Vector(64, f16) = undefined;
+    var dct_holder: @Vector(64, f16) = undefined;
     for (0..64) |i| {
-        holder[i] = @floatFromInt(source[i]);
+        source_holder[i] = @floatFromInt(source[i]);
+    }
+    const level_shift: @Vector(64, f16) = @splat(128.0);
+    const source_shifted = source_holder - level_shift;
+    for (0..8) |u| {
+        for (0..8) |v| {
+            dct_holder[u * 8 + v] = @reduce(.Add, dct_coeffs[u][v] * source_shifted);
+        }
+    }
+    const quantized = @round(dct_holder / qtable.*);
+    for (0..64) |i| {
+        target[i] = @intFromFloat(quantized[i]);
     }
 }