fix(YouTube - Spoof video streams): Make livestreams start at the current time when using iOS client (ReVanced#4137)

Author: LisoUseInAIKyrios

extensions/shared/library/src/main/java/app/revanced/extension/shared/spoof/SpoofVideoStreamsPatch.java

@@ -16,6 +16,10 @@
 @SuppressWarnings("unused")
 public class SpoofVideoStreamsPatch {
     private static final boolean SPOOF_STREAMING_DATA = BaseSettings.SPOOF_VIDEO_STREAMS.get();
+
+    private static final boolean FIX_HLS_CURRENT_TIME = SPOOF_STREAMING_DATA
+            && BaseSettings.SPOOF_VIDEO_STREAMS_CLIENT_TYPE.get() == ClientType.IOS;
+
     /**
      * Any unreachable ip address.  Used to intentionally fail requests.
      */
@@ -165,6 +169,19 @@ public static byte[] removeVideoPlaybackPostBody(Uri uri, int method, byte[] pos
         return postData;
     }
 
+    /**
+     * Injection point.
+     *
+     * Fixes iOS livestreams starting from the beginning.
+     */
+    public static boolean fixHLSCurrentTime(boolean original) {
+        if (FIX_HLS_CURRENT_TIME) {
+            return false;
+        }
+
+        return original;
+    }
+
     public static final class SpoofiOSAvailability implements Setting.Availability {
         @Override
         public boolean isAvailable() {

patches/src/main/kotlin/app/revanced/patches/shared/misc/spoof/Fingerprints.kt

@@ -1,6 +1,7 @@
 package app.revanced.patches.shared.misc.spoof
 
 import app.revanced.patcher.fingerprint
+import app.revanced.util.literal
 import com.android.tools.smali.dexlib2.AccessFlags
 import com.android.tools.smali.dexlib2.Opcode
 
@@ -110,3 +111,13 @@ internal val buildMediaDataSourceFingerprint = fingerprint {
         "Ljava/lang/Object;",
     )
 }
+
+internal const val HLS_CURRENT_TIME_FEATURE_FLAG = 45355374L
+
+internal val hlsCurrentTimeFingerprint = fingerprint {
+    accessFlags(AccessFlags.PUBLIC, AccessFlags.FINAL)
+    parameters("Z", "L")
+    literal {
+        HLS_CURRENT_TIME_FEATURE_FLAG
+    }
+}

patches/src/main/kotlin/app/revanced/patches/shared/misc/spoof/SpoofVideoStreamsPatch.kt

@@ -12,6 +12,7 @@ import app.revanced.patcher.util.proxy.mutableTypes.MutableMethod.Companion.toMu
 import app.revanced.patches.all.misc.resources.addResourcesPatch
 import app.revanced.util.getReference
 import app.revanced.util.indexOfFirstInstructionOrThrow
+import app.revanced.util.insertFeatureFlagBooleanOverride
 import com.android.tools.smali.dexlib2.AccessFlags
 import com.android.tools.smali.dexlib2.Opcode
 import com.android.tools.smali.dexlib2.builder.MutableMethodImplementation
@@ -201,6 +202,15 @@ fun spoofVideoStreamsPatch(
         }
         // endregion
 
+        // region Fix iOS livestream current time.
+
+        hlsCurrentTimeFingerprint.method.insertFeatureFlagBooleanOverride(
+            HLS_CURRENT_TIME_FEATURE_FLAG,
+            "$EXTENSION_CLASS_DESCRIPTOR->fixHLSCurrentTime(Z)Z"
+        )
+
+        // endregion
+
         executeBlock()
     }
 }

patches/src/main/resources/addresources/values/strings.xml

@@ -1290,7 +1290,6 @@ Video playback may not work"</string>
 AVC has a maximum resolution of 1080p, Opus audio codec is not available, and video playback will use more internet data than VP9 or AV1."</string>
             <string name="revanced_spoof_video_streams_about_ios_title">iOS spoofing side effects</string>
             <string name="revanced_spoof_video_streams_about_ios_summary">"• Private kids videos may not play
-• Livestreams start from the beginning
 • Videos end 1 second early"</string>
             <string name="revanced_spoof_video_streams_about_android_vr_title">Android VR spoofing side effects</string>
             <string name="revanced_spoof_video_streams_about_android_vr_summary">"• Kids videos may not play