diff --git a/camera/aidl/android/hardware/ICameraService.aidl b/camera/aidl/android/hardware/ICameraService.aidl
index 459ad15..873d738 100644
--- a/camera/aidl/android/hardware/ICameraService.aidl
+++ b/camera/aidl/android/hardware/ICameraService.aidl
@@ -20,6 +20,8 @@
 import android.hardware.ICameraClient;
 import android.hardware.camera2.ICameraDeviceUser;
 import android.hardware.camera2.ICameraDeviceCallbacks;
+import android.hardware.camera2.ICameraInjectionCallback;
+import android.hardware.camera2.ICameraInjectionSession;
 import android.hardware.camera2.params.VendorTagDescriptor;
 import android.hardware.camera2.params.VendorTagDescriptorCache;
 import android.hardware.camera2.utils.ConcurrentCameraIdCombination;
@@ -161,6 +163,9 @@
     boolean supportsCameraApi(String cameraId, int apiVersion);
     // Determines if a cameraId is a hidden physical camera of a logical multi-camera.
     boolean isHiddenPhysicalCamera(String cameraId);
+    // Inject the external camera to replace the internal camera session.
+    ICameraInjectionSession injectCamera(String packageName, String internalCamId,
+            String externalCamId, in ICameraInjectionCallback CameraInjectionCallback);
 
     void setTorchMode(String cameraId, boolean enabled, IBinder clientBinder);
 
diff --git a/camera/aidl/android/hardware/camera2/ICameraInjectionCallback.aidl b/camera/aidl/android/hardware/camera2/ICameraInjectionCallback.aidl
new file mode 100644
index 0000000..9791352
--- /dev/null
+++ b/camera/aidl/android/hardware/camera2/ICameraInjectionCallback.aidl
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.camera2;
+
+import android.hardware.camera2.ICameraInjectionSession;
+
+/**
+ * Binder interface used to call back the error state injected by the external camera,
+ * and camera service can be switched back to internal camera when binder signals process death.
+ *
+ * @hide
+ */
+interface ICameraInjectionCallback
+{
+    // Error codes for onInjectionError
+    // To indicate all invalid error codes
+    const int ERROR_INJECTION_INVALID_ERROR = -1;
+    // To indicate the camera injection session has encountered a fatal error, such as injection
+    // init failure, configure failure or injecting failure etc.
+    const int ERROR_INJECTION_SESSION = 0;
+    // To indicate the camera service has encountered a fatal error.
+    const int ERROR_INJECTION_SERVICE = 1;
+    // To indicate the injection camera does not support certain camera functions, such as
+    // unsupport stream format, no capture/record function or no multi-camera function etc.
+    // When this error occurs, the default processing is still in the inject state, and the app is
+    // notified to display an error message and a black screen.
+    const int ERROR_INJECTION_UNSUPPORTED = 2;
+
+    oneway void onInjectionError(int errorCode);
+}
diff --git a/camera/aidl/android/hardware/camera2/ICameraInjectionSession.aidl b/camera/aidl/android/hardware/camera2/ICameraInjectionSession.aidl
new file mode 100644
index 0000000..c31c30b
--- /dev/null
+++ b/camera/aidl/android/hardware/camera2/ICameraInjectionSession.aidl
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.camera2;
+
+/** @hide */
+interface ICameraInjectionSession
+{
+    oneway void stopInjection();
+}