Add documentation for BOLA rule

pages/advanced/abr/bola-rule.md

@@ -0,0 +1,40 @@
+---
+layout: default
+title: BolaRule
+parent: Adaptive Bitrate Streaming
+grand_parent: Advanced Features
+---
+
+# BolaRule
+
+## Description
+
+The `BolaRule` is a buffer based ABR rule. BOLA uses a bitrate selection function that maps the current buffer level to
+the bitrate of the next segment to be downloaded. The illustration below shows an example of a bitrate selection
+function for a video that is encoded in three bitrates (1000, 2500 and 5000 kbps) and has a buffer capacity of 18
+seconds. The thresholds for switching to a different quality are at 5 and 10 seconds of buffer. 
+
+![ABR]({{site.baseurl}}/assets/images/bola.png)
+
+For additional details about the BOLA rule check out the following two paper:
+
+* [From Theory to Practice: Improving Bitrate Adaptation in the DASH Reference Player](https://dl.acm.org/doi/pdf/10.1145/3336497)
+* [BOLA: Near-optimal bitrate adaptation for online videos](https://ieeexplore.ieee.org/document/7524428)
+
+## Example
+
+```js
+player.updateSettings({
+    streaming: {
+        abr: {
+            rules: {
+                bolaRule: {
+                    active: true
+                }
+            }
+        }
+    }
+});
+```
+
+

pages/advanced/abr/settings.md

@@ -47,7 +47,7 @@ player.updateSettings({
 | ABR Rule         | Description                            |
 |:-----------------|:---------------------------------------|
 | `throughputRule` | [ThroughputRule](throughput-rule.html) |
-| `bolaRule`       | tbd                                    |
+| `bolaRule`       | [BolaRule](bola-rule.html)             |
 
 **Important**: If both `throughputRule` and `bolaRule` are enabled dash.js dynamically switches between those two
 rules based on the current buffer level.
@@ -91,7 +91,7 @@ player.updateSettings({
 | ABR Rule                 | Description                                             |
 |:-------------------------|:--------------------------------------------------------|
 | `insufficientBufferRule` | [InsufficientBufferRule](insufficient-buffer-rule.html) |
-| `switchHistoryRule`      | tbd                                                     |
+| `switchHistoryRule`      | [SwitchHistoryRule](switch-history-rule.html)           |
 | `droppedFramesRule`      | [DroppedFramesRule](dropped-frames-rule.html)           |
 | `abandonRequestsRule`    | [AbandonRequestRule](abandon-request-rule.html)         |
 | `l2ARule`                | [L2ARule](l2a.html)                                     |