LG8n: Add libcamera_metadata shim for stripping out system camera cap

Change-Id: I8f7772fc9ec15a00c4b630866aa7fc162a52c1aa
Signed-off-by: SamarV-121 <samarvispute121@pm.me>

device.mk

@@ -97,8 +97,7 @@ PRODUCT_PACKAGES += \
     android.hardware.camera.provider@2.6.vendor
 
 PRODUCT_PACKAGES += \
-    libcamera_metadata.vendor \
+    libshim_camera_metadata \
-    libcamera_metadata_shim \
     libdng_sdk.vendor \
     libexpat.vendor \
     libpng.vendor

libshims/Android.bp

@@ -16,3 +16,10 @@ cc_library_shared {
         "libmedia_headers",
     ],
 }
+
+cc_library {
+    name: "libshim_camera_metadata",
+    shared_libs: ["libcamera_metadata"],
+    srcs: ["libshim_camera_metadata.cpp"],
+    vendor: true
+}

libshims/libshim_camera_metadata.cpp

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2022 The LineageOS Project
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <dlfcn.h>
+#include <system/camera_metadata.h>
+#include <vector>
+
+extern "C" int add_camera_metadata_entry(camera_metadata_t* dst, uint32_t tag, const void* data,
+                                         size_t data_count) {
+    static auto add_camera_metadata_entry_orig =
+            reinterpret_cast<typeof(add_camera_metadata_entry)*>(
+                    dlsym(RTLD_NEXT, "add_camera_metadata_entry"));
+
+    if (tag == ANDROID_REQUEST_AVAILABLE_CAPABILITIES) {
+        std::vector<uint8_t> caps;
+        auto u8 = reinterpret_cast<const uint8_t*>(data);
+
+        for (size_t i = 0; i < data_count; i++) {
+            if (u8[i] != ANDROID_REQUEST_AVAILABLE_CAPABILITIES_SYSTEM_CAMERA) {
+                caps.emplace_back(u8[i]);
+            }
+        }
+
+        return add_camera_metadata_entry_orig(dst, tag, caps.data(), caps.size());
+    }
+
+    return add_camera_metadata_entry_orig(dst, tag, data, data_count);
+}
+
+extern "C" int update_camera_metadata_entry(camera_metadata_t* dst, size_t index, const void* data,
+                                            size_t data_count,
+                                            camera_metadata_entry_t* updated_entry) {
+    static auto update_camera_metadata_entry_orig =
+            reinterpret_cast<typeof(update_camera_metadata_entry)*>(
+                    dlsym(RTLD_NEXT, "update_camera_metadata_entry"));
+
+    if (camera_metadata_entry_t entry;
+        find_camera_metadata_entry(dst, ANDROID_REQUEST_AVAILABLE_CAPABILITIES, &entry) == 0 &&
+        entry.index == index) {
+        std::vector<uint8_t> caps;
+        auto u8 = reinterpret_cast<const uint8_t*>(data);
+
+        for (size_t i = 0; i < data_count; i++) {
+            if (u8[i] != ANDROID_REQUEST_AVAILABLE_CAPABILITIES_SYSTEM_CAMERA) {
+                caps.emplace_back(u8[i]);
+            }
+        }
+
+        return update_camera_metadata_entry_orig(dst, index, caps.data(), caps.size(),
+                                                 updated_entry);
+    }
+
+    return update_camera_metadata_entry_orig(dst, index, data, data_count, updated_entry);
+}