feat(Sync for Reddit): Add Fix video downloads patch

app/src/main/java/app/revanced/integrations/syncforreddit/FixRedditVideoDownloadPatch.java

@@ -0,0 +1,13 @@
+package app.revanced.integrations.syncforreddit;
+
+import app.revanced.integrations.syncforreddit.internal.RedditVideoPlaylistParser;
+
+/**
+ * @noinspection unused
+ */
+public class FixRedditVideoDownloadPatch {
+
+    public static String[] getLinks(byte[] data) {
+        return RedditVideoPlaylistParser.INSTANCE.parse(data);
+    }
+}

app/src/main/java/app/revanced/integrations/syncforreddit/internal/RedditVideoPlaylistParser.kt

@@ -0,0 +1,51 @@
+package app.revanced.integrations.syncforreddit.internal
+
+import org.w3c.dom.Element
+import java.io.ByteArrayInputStream
+import javax.xml.parsers.DocumentBuilderFactory
+
+object RedditVideoPlaylistParser {
+    class MpdEntry(val bandwidth: Int, val baseUrl: String)
+
+    private fun getBestMpEntry(element: Element): MpdEntry? {
+        val representations = element.getElementsByTagName("Representation")
+        val entries = mutableListOf<MpdEntry>()
+        for (i in 0 until representations.length) {
+            val representation = representations.item(i) as Element
+            val bandwidth = representation.getAttribute("bandwidth")?.toIntOrNull()
+            val baseUrl = representation.getElementsByTagName("BaseURL").item(0)
+
+            if (bandwidth != null && baseUrl != null) {
+                entries.add(MpdEntry(bandwidth, baseUrl.textContent))
+            }
+        }
+
+        return entries.maxByOrNull { it.bandwidth }
+    }
+
+    fun parse(data: ByteArray): Array<String?> {
+        val adaptionSets = DocumentBuilderFactory
+            .newInstance()
+            .newDocumentBuilder()
+            .parse(ByteArrayInputStream(data))
+            .getElementsByTagName("AdaptationSet")
+
+        var videoUrl: String? = null
+        var audioUrl: String? = null
+
+        for (i in 0 until adaptionSets.length) {
+            val element = adaptionSets.item(i) as Element
+            val contentType = element.getAttribute("contentType")
+            val bestEntry = getBestMpEntry(element) ?: continue
+
+            when (contentType) {
+                "video" -> videoUrl = bestEntry.baseUrl
+                "audio" -> audioUrl = bestEntry.baseUrl
+            }
+        }
+
+        return arrayOf(videoUrl, audioUrl)
+    }
+}
+
+