feat(Sync for Reddit): Add Fix video downloads patch (#3739)

Co-authored-by: oSumAtrIX <johan.melkonyan1@web.de>

Author: 1fexd

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 +1,62 @@
+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.getInstruction
+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.resultOrThrow
+import com.android.tools.smali.dexlib2.iface.instruction.formats.Instruction35c
+
+@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,
+)
+@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().let {
+            val scanResult = it.scanResult.patternScanResult!!
+            val newInstanceIndex = scanResult.startIndex
+            val invokeDirectIndex = scanResult.endIndex - 1
+
+            val buildResponseInstruction = it.mutableMethod.getInstruction<Instruction35c>(invokeDirectIndex)
+
+            it.mutableMethod.addInstructions(
+                newInstanceIndex + 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).
+                    const/4 v5, 0x0
+                    aget-object v${buildResponseInstruction.registerE}, v2, v5
+            
+                    # Get audioUrl (Index 1).
+                    const/4 v6, 0x1
+                    aget-object v${buildResponseInstruction.registerF}, v2, v6
+    
+                    # Register E and F are used to build the response.
+                """,
+            )
+        }
+    }
+}

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

@@ -0,0 +1,16 @@
+package app.revanced.patches.reddit.customclients.syncforreddit.fix.video.fingerprints
+
+import app.revanced.patcher.fingerprint.MethodFingerprint
+import com.android.tools.smali.dexlib2.Opcode
+
+internal object ParseRedditVideoNetworkResponseFingerprint : MethodFingerprint(
+    opcodes = listOf(
+        Opcode.NEW_INSTANCE,
+        Opcode.IGET_OBJECT,
+        Opcode.INVOKE_DIRECT,
+        Opcode.CONST_WIDE_32
+    ),
+    customFingerprint = { methodDef, classDef ->
+        classDef.sourceFile == "RedditVideoRequest.java" && methodDef.name == "parseNetworkResponse"
+    }
+)