fix(YouTube): Do not reset playback speed to 1.0x after closing comment thread (Fixes stock YouTube bug) (#4195)

extensions/youtube/src/main/java/app/revanced/extension/youtube/patches/FixPlaybackSpeedWhilePlayingPatch.java

@@ -0,0 +1,24 @@
+package app.revanced.extension.youtube.patches;
+
+import app.revanced.extension.shared.Logger;
+import app.revanced.extension.youtube.shared.PlayerType;
+
+@SuppressWarnings("unused")
+public class FixPlaybackSpeedWhilePlayingPatch {
+
+    private static final float DEFAULT_YOUTUBE_PLAYBACK_SPEED = 1.0f;
+
+    public static boolean playbackSpeedChanged(float playbackSpeed) {
+        if (playbackSpeed == DEFAULT_YOUTUBE_PLAYBACK_SPEED &&
+                PlayerType.getCurrent().isMaximizedOrFullscreen()) {
+
+            Logger.printDebug(() -> "Blocking call to change playback speed to 1.0x");
+
+            return true;
+        }
+
+        return false;
+    }
+
+}
+

patches/api/patches.api

@@ -1296,6 +1296,10 @@ public final class app/revanced/patches/youtube/misc/fix/playback/UserAgentClien
 	public static final fun getUserAgentClientSpoofPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
 }
 
+public final class app/revanced/patches/youtube/misc/fix/playbackspeed/FIxPlaybackSpeedWhilePlayingPatchKt {
+	public static final fun getFixPlaybackSpeedWhilePlayingPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
+}
+
 public final class app/revanced/patches/youtube/misc/gms/GmsCoreSupportPatchKt {
 	public static final fun getGmsCoreSupportPatch ()Lapp/revanced/patcher/patch/BytecodePatch;
 }

patches/src/main/kotlin/app/revanced/patches/youtube/misc/dns/CheckWatchHistoryDomainNameResolutionPatch.kt

@@ -4,6 +4,7 @@ import app.revanced.patcher.extensions.InstructionExtensions.addInstruction
 import app.revanced.patcher.patch.bytecodePatch
 import app.revanced.patches.all.misc.resources.addResources
 import app.revanced.patches.all.misc.resources.addResourcesPatch
+import app.revanced.patches.youtube.misc.extension.sharedExtensionPatch
 import app.revanced.patches.youtube.shared.mainActivityOnCreateFingerprint
 
 private const val EXTENSION_CLASS_DESCRIPTOR =
@@ -13,7 +14,10 @@ val checkWatchHistoryDomainNameResolutionPatch = bytecodePatch(
     name = "Check watch history domain name resolution",
     description = "Checks if the device DNS server is preventing user watch history from being saved.",
 ) {
-    dependsOn(addResourcesPatch)
+    dependsOn(
+        sharedExtensionPatch,
+        addResourcesPatch
+    )
 
     compatibleWith(
         "com.google.android.youtube"(

patches/src/main/kotlin/app/revanced/patches/youtube/misc/fix/playbackspeed/FIxPlaybackSpeedWhilePlayingPatch.kt

@@ -0,0 +1,61 @@
+package app.revanced.patches.youtube.misc.fix.playbackspeed
+
+import app.revanced.patcher.extensions.InstructionExtensions.addInstructionsWithLabels
+import app.revanced.patcher.extensions.InstructionExtensions.getInstruction
+import app.revanced.patcher.patch.bytecodePatch
+import app.revanced.patcher.util.smali.ExternalLabel
+import app.revanced.patches.youtube.misc.extension.sharedExtensionPatch
+import app.revanced.patches.youtube.misc.playertype.playerTypeHookPatch
+import app.revanced.patches.youtube.misc.playservice.is_19_34_or_greater
+import app.revanced.patches.youtube.misc.playservice.versionCheckPatch
+import app.revanced.util.indexOfFirstInstructionOrThrow
+import com.android.tools.smali.dexlib2.Opcode
+import com.android.tools.smali.dexlib2.iface.instruction.TwoRegisterInstruction
+
+private const val EXTENSION_CLASS_DESCRIPTOR =
+    "Lapp/revanced/extension/youtube/patches/FixPlaybackSpeedWhilePlayingPatch;"
+
+/**
+ * Fixes a bug in YouTube 19.34+ where the playback speed
+ * can incorrectly reset to 1.0x under certain conditions.
+ *
+ * Reproduction steps using 19.34+
+ * 1. Open a video and start playback
+ * 2. Change the speed to any value that is not 1.0x.
+ * 3. Open the comments panel.
+ * 4. Tap any "N more replies" link at the bottom of a comment, or tap on a timestamp of a comment.
+ * 5. Pause the video
+ * 6. Resume the video
+ * 7. Playback speed will incorrectly change to 1.0x.
+ */
+@Suppress("unused")
+val fixPlaybackSpeedWhilePlayingPatch = bytecodePatch{
+    dependsOn(
+        sharedExtensionPatch,
+        playerTypeHookPatch,
+        versionCheckPatch,
+    )
+
+    execute {
+        if (!is_19_34_or_greater) {
+            return@execute
+        }
+
+        playbackSpeedInFeedsFingerprint.method.apply {
+            val freeRegister = implementation!!.registerCount - parameters.size - 2
+            val playbackSpeedIndex = indexOfGetPlaybackSpeedInstruction(this)
+            val playbackSpeedRegister = getInstruction<TwoRegisterInstruction>(playbackSpeedIndex).registerA
+            val returnIndex = indexOfFirstInstructionOrThrow(playbackSpeedIndex, Opcode.RETURN_VOID)
+
+            addInstructionsWithLabels(
+                playbackSpeedIndex + 1,
+                """
+                    invoke-static { v$playbackSpeedRegister }, $EXTENSION_CLASS_DESCRIPTOR->playbackSpeedChanged(F)Z
+                    move-result v$freeRegister
+                    if-nez v$freeRegister, :do_not_change
+                """,
+                ExternalLabel("do_not_change", getInstruction(returnIndex))
+            )
+        }
+    }
+}

patches/src/main/kotlin/app/revanced/patches/youtube/misc/fix/playbackspeed/Fingerprints.kt

@@ -0,0 +1,38 @@
+package app.revanced.patches.youtube.misc.fix.playbackspeed
+
+import app.revanced.patcher.fingerprint
+import app.revanced.util.getReference
+import app.revanced.util.indexOfFirstInstructionReversed
+import com.android.tools.smali.dexlib2.AccessFlags
+import com.android.tools.smali.dexlib2.Opcode
+import com.android.tools.smali.dexlib2.iface.Method
+import com.android.tools.smali.dexlib2.iface.reference.FieldReference
+
+/**
+ * This method is usually used to set the initial speed (1.0x) when playback starts from the feed.
+ * For some reason, in the latest YouTube, it is invoked even after the video has already started.
+ */
+internal val playbackSpeedInFeedsFingerprint = fingerprint {
+    accessFlags(AccessFlags.PUBLIC, AccessFlags.FINAL)
+    returns("V")
+    parameters("L")
+    opcodes(
+        Opcode.IGET,
+        Opcode.MUL_INT_LIT16,
+        Opcode.IGET_WIDE,
+        Opcode.CONST_WIDE_16,
+        Opcode.CMP_LONG,
+        Opcode.IF_EQZ,
+        Opcode.IF_LEZ,
+        Opcode.SUB_LONG_2ADDR,
+    )
+    custom { method, _ ->
+        indexOfGetPlaybackSpeedInstruction(method) >= 0
+    }
+}
+
+internal fun indexOfGetPlaybackSpeedInstruction(method: Method) =
+    method.indexOfFirstInstructionReversed {
+        opcode == Opcode.IGET &&
+                getReference<FieldReference>()?.type == "F"
+    }

patches/src/main/kotlin/app/revanced/patches/youtube/misc/settings/SettingsPatch.kt

@@ -18,6 +18,7 @@ import app.revanced.patches.shared.misc.settings.settingsPatch
 import app.revanced.patches.youtube.misc.check.checkEnvironmentPatch
 import app.revanced.patches.youtube.misc.extension.sharedExtensionPatch
 import app.revanced.patches.youtube.misc.fix.cairo.disableCairoSettingsPatch
+import app.revanced.patches.youtube.misc.fix.playbackspeed.fixPlaybackSpeedWhilePlayingPatch
 import app.revanced.util.*
 import com.android.tools.smali.dexlib2.Opcode
 import com.android.tools.smali.dexlib2.iface.instruction.OneRegisterInstruction
@@ -118,6 +119,7 @@ val settingsPatch = bytecodePatch(
         settingsResourcePatch,
         addResourcesPatch,
         disableCairoSettingsPatch,
+        fixPlaybackSpeedWhilePlayingPatch,
         // Currently there is no easy way to make a mandatory patch,
         // so for now this is a dependent of this patch.
         checkEnvironmentPatch,