diff --git a/apex/Android.bp b/apex/Android.bp
index 6ba9cb9..2ae3bbe 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -32,15 +32,21 @@
                 "liboggextractor",
                 "libwavextractor",
             ],
+            // Transcoding service only run with primary ABI.
+            binaries: [
+                "mediatranscoding",
+            ],
         },
     },
     // JNI
     native_shared_libs: ["libmediaparser-jni"],
     compile_multilib: "both",
     prebuilts: [
-        "mediaextractor.policy",
         "code_coverage.policy",
+        "com.android.media-mediatranscoding.rc",
         "crash_dump.policy",
+        "mediaextractor.policy",
+        "media-linker-config",
     ],
     key: "com.android.media.key",
     certificate: ":com.android.media.certificate",
@@ -62,9 +68,6 @@
     name: "com.android.media",
     manifest: "manifest.json",
     defaults: ["com.android.media-defaults"],
-    prebuilts: [
-        "media-linker-config",
-    ],
 }
 
 linker_config {
@@ -115,6 +118,13 @@
 }
 
 prebuilt_etc {
+    name: "com.android.media-mediatranscoding.rc",
+    src: "mediatranscoding.rc",
+    filename: "init.rc",
+    installable: false,
+}
+
+prebuilt_etc {
     name: "com.android.media.swcodec-mediaswcodec.rc",
     src: "mediaswcodec.rc",
     filename: "init.rc",
diff --git a/apex/manifest.json b/apex/manifest.json
index f1f69f4..b7d8fc8 100644
--- a/apex/manifest.json
+++ b/apex/manifest.json
@@ -1,4 +1,10 @@
 {
   "name": "com.android.media",
-  "version": 309999900
+  "version": 309999900,
+  "requireNativeLibs": [
+    "libandroid.so",
+    "libbinder_ndk.so",
+    "libmediandk.so",
+    ":sphal"
+  ]
 }
diff --git a/apex/mediatranscoding.rc b/apex/mediatranscoding.rc
new file mode 100644
index 0000000..fa4acf8
--- /dev/null
+++ b/apex/mediatranscoding.rc
@@ -0,0 +1,10 @@
+# media.transcoding service is defined on com.android.media apex which goes back
+# to API29, but we only want it started on API31+ devices. So we declare it as
+# "disabled" and start it explicitly on boot.
+service media.transcoding /apex/com.android.media/bin/mediatranscoding
+    class main
+    user media
+    group media
+    ioprio rt 4
+    task_profiles ProcessCapacityHigh HighPerformance
+    disabled
diff --git a/media/libmediatranscoding/Android.bp b/media/libmediatranscoding/Android.bp
index 1934820..094d7c3 100644
--- a/media/libmediatranscoding/Android.bp
+++ b/media/libmediatranscoding/Android.bp
@@ -44,6 +44,19 @@
     {
         java: {
             enabled: true,
+            apex_available: [
+                "com.android.media",
+                "test_com.android.media",
+            ],
+            min_sdk_version: "29",
+        },
+        ndk: {
+            enabled: true,
+            apex_available: [
+                "com.android.media",
+                "test_com.android.media",
+            ],
+            min_sdk_version: "29",
         },
     },
 }
@@ -51,6 +64,12 @@
 cc_library {
     name: "libmediatranscoding",
 
+    min_sdk_version: "29",
+    apex_available: [
+        "com.android.media",
+        "test_com.android.media",
+    ],
+
     srcs: [
         "TranscodingClientManager.cpp",
         "TranscodingSessionController.cpp",
@@ -60,7 +79,7 @@
     ],
 
     shared_libs: [
-        "libandroid",
+        "libandroid#31",
         "libbinder_ndk",
         "libcutils",
         "liblog",
diff --git a/media/libmediatranscoding/include/media/TranscoderWrapper.h b/media/libmediatranscoding/include/media/TranscoderWrapper.h
index 9ec32d7..02beede 100644
--- a/media/libmediatranscoding/include/media/TranscoderWrapper.h
+++ b/media/libmediatranscoding/include/media/TranscoderWrapper.h
@@ -17,7 +17,6 @@
 #ifndef ANDROID_TRANSCODER_WRAPPER_H
 #define ANDROID_TRANSCODER_WRAPPER_H
 
-#include <android-base/thread_annotations.h>
 #include <media/NdkMediaError.h>
 #include <media/TranscoderInterface.h>
 
diff --git a/media/libmediatranscoding/transcoder/Android.bp b/media/libmediatranscoding/transcoder/Android.bp
index aa7cdde..bebe6b1 100644
--- a/media/libmediatranscoding/transcoder/Android.bp
+++ b/media/libmediatranscoding/transcoder/Android.bp
@@ -28,6 +28,14 @@
         "VideoTrackTranscoder.cpp",
     ],
 
+    min_sdk_version: "29",
+    apex_available: [
+        "com.android.media",
+        "test_com.android.media",
+    ],
+
+    //header_libs: [ "libarect_headers", "libarect_headers_for_ndk" ],
+    static_libs: [ "libarect" ],
     shared_libs: [
         "libbase",
         "libcutils",
diff --git a/media/mediaserver/mediaserver.rc b/media/mediaserver/mediaserver.rc
index 05373c9..c82e532 100644
--- a/media/mediaserver/mediaserver.rc
+++ b/media/mediaserver/mediaserver.rc
@@ -7,3 +7,9 @@
     group audio camera inet net_bt net_bt_admin net_bw_acct drmrpc mediadrm
     ioprio rt 4
     task_profiles ProcessCapacityHigh HighPerformance
+
+# media.transcoding service is defined on com.android.media apex which goes back
+# to API29, but we only want it started on API31+ devices. So we declare it as
+# "disabled" and start it explicitly on boot.
+on boot
+    start media.transcoding
diff --git a/services/mediaresourcemanager/Android.bp b/services/mediaresourcemanager/Android.bp
index cdf5a4e..83a139b 100644
--- a/services/mediaresourcemanager/Android.bp
+++ b/services/mediaresourcemanager/Android.bp
@@ -35,11 +35,27 @@
 
 aidl_interface {
     name: "resourceobserver_aidl_interface",
-    unstable: true,
     local_include_dir: "aidl",
     srcs: [
         ":resourceobserver_aidl",
     ],
+    backend: {
+        java: {
+            enabled: false,
+        },
+        cpp: {
+            enabled: false,
+        },
+        ndk: {
+            apex_available: [
+                "//apex_available:platform",
+                "com.android.media",
+                "test_com.android.media",
+            ],
+            min_sdk_version: "29",
+            enabled: true,
+        },
+    },
 }
 
 cc_library {
diff --git a/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/IResourceObserver.aidl b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/IResourceObserver.aidl
new file mode 100644
index 0000000..402704b
--- /dev/null
+++ b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/IResourceObserver.aidl
@@ -0,0 +1,22 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
+// edit this file. It looks like you are doing that because you have modified
+// an AIDL interface in a backward-incompatible way, e.g., deleting a function
+// from an interface or a field from a parcelable and it broke the build. That
+// breakage is intended.
+//
+// You must not make a backward incompatible changes to the AIDL files built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.media;
+/* @hide */
+interface IResourceObserver {
+  oneway void onStatusChanged(android.media.MediaObservableEvent event, int uid, int pid, in android.media.MediaObservableParcel[] observables);
+}
diff --git a/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/IResourceObserverService.aidl b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/IResourceObserverService.aidl
new file mode 100644
index 0000000..a0ef761
--- /dev/null
+++ b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/IResourceObserverService.aidl
@@ -0,0 +1,23 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
+// edit this file. It looks like you are doing that because you have modified
+// an AIDL interface in a backward-incompatible way, e.g., deleting a function
+// from an interface or a field from a parcelable and it broke the build. That
+// breakage is intended.
+//
+// You must not make a backward incompatible changes to the AIDL files built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.media;
+/* @hide */
+interface IResourceObserverService {
+  void registerObserver(android.media.IResourceObserver observer, in android.media.MediaObservableFilter[] filters);
+  void unregisterObserver(android.media.IResourceObserver observer);
+}
diff --git a/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableEvent.aidl b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableEvent.aidl
new file mode 100644
index 0000000..fd60bea
--- /dev/null
+++ b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableEvent.aidl
@@ -0,0 +1,25 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
+// edit this file. It looks like you are doing that because you have modified
+// an AIDL interface in a backward-incompatible way, e.g., deleting a function
+// from an interface or a field from a parcelable and it broke the build. That
+// breakage is intended.
+//
+// You must not make a backward incompatible changes to the AIDL files built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.media;
+/* @hide */
+@Backing(type="long")
+enum MediaObservableEvent {
+  kBusy = 1,
+  kIdle = 2,
+  kAll = -1,
+}
diff --git a/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableFilter.aidl b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableFilter.aidl
new file mode 100644
index 0000000..4045ae0
--- /dev/null
+++ b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableFilter.aidl
@@ -0,0 +1,23 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
+// edit this file. It looks like you are doing that because you have modified
+// an AIDL interface in a backward-incompatible way, e.g., deleting a function
+// from an interface or a field from a parcelable and it broke the build. That
+// breakage is intended.
+//
+// You must not make a backward incompatible changes to the AIDL files built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.media;
+/* @hide */
+parcelable MediaObservableFilter {
+  android.media.MediaObservableType type;
+  android.media.MediaObservableEvent eventFilter;
+}
diff --git a/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableParcel.aidl b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableParcel.aidl
new file mode 100644
index 0000000..ff5a8e8
--- /dev/null
+++ b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableParcel.aidl
@@ -0,0 +1,23 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
+// edit this file. It looks like you are doing that because you have modified
+// an AIDL interface in a backward-incompatible way, e.g., deleting a function
+// from an interface or a field from a parcelable and it broke the build. That
+// breakage is intended.
+//
+// You must not make a backward incompatible changes to the AIDL files built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.media;
+/* @hide */
+parcelable MediaObservableParcel {
+  android.media.MediaObservableType type;
+  long value = 0;
+}
diff --git a/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableType.aidl b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableType.aidl
new file mode 100644
index 0000000..ebb8d8e
--- /dev/null
+++ b/services/mediaresourcemanager/aidl_api/resourceobserver_aidl_interface/current/android/media/MediaObservableType.aidl
@@ -0,0 +1,25 @@
+///////////////////////////////////////////////////////////////////////////////
+// THIS FILE IS IMMUTABLE. DO NOT EDIT IN ANY CASE.                          //
+///////////////////////////////////////////////////////////////////////////////
+
+// This file is a snapshot of an AIDL interface (or parcelable). Do not try to
+// edit this file. It looks like you are doing that because you have modified
+// an AIDL interface in a backward-incompatible way, e.g., deleting a function
+// from an interface or a field from a parcelable and it broke the build. That
+// breakage is intended.
+//
+// You must not make a backward incompatible changes to the AIDL files built
+// with the aidl_interface module type with versions property set. The module
+// type is used to build AIDL files in a way that they can be used across
+// independently updatable components of the system. If a device is shipped
+// with such a backward incompatible change, it has a high risk of breaking
+// later when a module using the interface is updated, e.g., Mainline modules.
+
+package android.media;
+/* @hide */
+@Backing(type="int")
+enum MediaObservableType {
+  kInvalid = 0,
+  kVideoSecureCodec = 1000,
+  kVideoNonSecureCodec = 1001,
+}
diff --git a/services/mediatranscoding/Android.bp b/services/mediatranscoding/Android.bp
index 3d6821b..48c2584 100644
--- a/services/mediatranscoding/Android.bp
+++ b/services/mediatranscoding/Android.bp
@@ -7,8 +7,14 @@
         "SimulatedTranscoder.cpp",
     ],
 
+    min_sdk_version: "29",
+    apex_available: [
+        "com.android.media",
+        "test_com.android.media",
+    ],
+
     shared_libs: [
-        "libandroid",
+        "libandroid#31",
         "libbase",
         "libbinder_ndk",
         "libcutils",
@@ -48,12 +54,16 @@
         "libmediatranscodingservice",
     ],
 
+    min_sdk_version: "29",
+    apex_available: [
+        "com.android.media",
+        "test_com.android.media",
+    ],
+
     static_libs: [
         "mediatranscoding_aidl_interface-ndk_platform",
     ],
 
-    init_rc: ["mediatranscoding.rc"],
-
     cflags: [
         "-Werror",
         "-Wall",
diff --git a/services/mediatranscoding/mediatranscoding.rc b/services/mediatranscoding/mediatranscoding.rc
deleted file mode 100644
index 5bfef59..0000000
--- a/services/mediatranscoding/mediatranscoding.rc
+++ /dev/null
@@ -1,6 +0,0 @@
-service media.transcoding /system/bin/mediatranscoding
-    class main
-    user media
-    group media
-    ioprio rt 4
-    task_profiles ProcessCapacityHigh HighPerformance