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

api/revanced-patches.api

@@ -840,6 +840,12 @@ public final class app/revanced/patches/reddit/customclients/syncforreddit/fix/u
 	public synthetic fun execute (Lapp/revanced/patcher/data/Context;)V
 }
 
+public final class app/revanced/patches/reddit/customclients/syncforreddit/fix/video/FixVideoDownloadsPatch : app/revanced/patcher/patch/BytecodePatch {
+	public static final field INSTANCE Lapp/revanced/patches/reddit/customclients/syncforreddit/fix/video/FixVideoDownloadsPatch;
+	public fun execute (Lapp/revanced/patcher/data/BytecodeContext;)V
+	public synthetic fun execute (Lapp/revanced/patcher/data/Context;)V
+}
+
 public final class app/revanced/patches/reddit/customclients/syncforreddit/misc/integrations/IntegrationsPatch : app/revanced/patches/shared/misc/integrations/BaseIntegrationsPatch {
 	public static final field INSTANCE Lapp/revanced/patches/reddit/customclients/syncforreddit/misc/integrations/IntegrationsPatch;
 }

src/main/kotlin/app/revanced/patches/reddit/customclients/syncforreddit/fix/video/FixVideoDownloadsPatch.kt

@@ -0,0 +1,71 @@
+package app.revanced.patches.reddit.customclients.syncforreddit.fix.video
+
+import app.revanced.patcher.data.BytecodeContext
+import app.revanced.patcher.extensions.InstructionExtensions.addInstructions
+import app.revanced.patcher.extensions.InstructionExtensions.removeInstructions
+import app.revanced.patcher.patch.BytecodePatch
+import app.revanced.patcher.patch.annotation.CompatiblePackage
+import app.revanced.patcher.patch.annotation.Patch
+import app.revanced.patches.reddit.customclients.syncforreddit.fix.video.fingerprints.ParseRedditVideoNetworkResponseFingerprint
+import app.revanced.util.getReference
+import app.revanced.util.indexOfFirstInstructionOrThrow
+import app.revanced.util.resultOrThrow
+import com.android.tools.smali.dexlib2.Opcode
+import com.android.tools.smali.dexlib2.iface.reference.TypeReference
+
+@Patch(
+    name = "Fix video downloads",
+    description = "Fixes a bug in Sync's MPD parser resulting in only the audio-track being saved.",
+    compatiblePackages = [
+        CompatiblePackage("com.laurencedawson.reddit_sync"),
+        CompatiblePackage("com.laurencedawson.reddit_sync.pro"),
+        CompatiblePackage("com.laurencedawson.reddit_sync.dev"),
+    ],
+    requiresIntegrations = true,
+    use = true,
+)
+@Suppress("unused")
+object FixVideoDownloadsPatch : BytecodePatch(
+    fingerprints = setOf(ParseRedditVideoNetworkResponseFingerprint),
+) {
+    private const val INTEGRATIONS_CLASS_DESCRIPTOR =
+        "Lapp/revanced/integrations/syncforreddit/FixRedditVideoDownloadPatch;"
+    private const val GET_LINKS_METHOD = "getLinks([B)[Ljava/lang/String;"
+
+    override fun execute(context: BytecodeContext) {
+        ParseRedditVideoNetworkResponseFingerprint.resultOrThrow().mutableMethod.apply {
+
+            // Find the instruction which creates the result data class.
+            val newInstanceIndex = indexOfFirstInstructionOrThrow {
+                opcode == Opcode.NEW_INSTANCE && getReference<TypeReference>().toString() == "Lo8/h;"
+            }
+
+            // Remove all instructions up to that point, because they are not needed anymore.
+            removeInstructions(0, newInstanceIndex)
+
+            // new-instance instruction from above is now at index 0, add the patch directly after it.
+            addInstructions(
+                1,
+                """
+                    # Get byte array from response.
+                    iget-object v2, p1, Lcom/android/volley/NetworkResponse;->data:[B
+
+                    # Parse the videoUrl and audioUrl from the byte array.
+                    invoke-static { v2 }, $INTEGRATIONS_CLASS_DESCRIPTOR->$GET_LINKS_METHOD
+                    move-result-object v2
+
+                    # Get videoUrl (Index 0) and move it into v3.
+                    const/4 v5, 0x0
+                    aget-object v3, v2, v5
+
+                    # Get audioUrl (Index 1) and move it into v4.
+                    const/4 v6, 0x1
+                    aget-object v4, v2, v6
+
+                    # v3 and v4 is used to build the response after this.
+                """
+            )
+        }
+
+    }
+}

src/main/kotlin/app/revanced/patches/reddit/customclients/syncforreddit/fix/video/fingerprints/ParseRedditVideoNetworkResponseFingerprint.kt

@@ -0,0 +1,9 @@
+package app.revanced.patches.reddit.customclients.syncforreddit.fix.video.fingerprints
+
+import app.revanced.patcher.fingerprint.MethodFingerprint
+
+internal object ParseRedditVideoNetworkResponseFingerprint : MethodFingerprint(
+    customFingerprint = { methodDef, classDef ->
+        classDef.sourceFile == "RedditVideoRequest.java" && methodDef.name == "parseNetworkResponse"
+    }
+)