Checks if a custom global resource provider is used as the first step of loading the model resources on all platforms.

PiperOrigin-RevId: 493141519

mediapipe/tasks/cc/core/BUILD

@@ -117,6 +117,7 @@ cc_library_with_tflite(
         "//mediapipe/tasks/cc/core/proto:external_file_cc_proto",
         "//mediapipe/tasks/cc/metadata:metadata_extractor",
         "//mediapipe/util:resource_util",
+        "//mediapipe/util:resource_util_custom",
         "//mediapipe/util/tflite:error_reporter",
         "@com_google_absl//absl/memory",
         "@com_google_absl//absl/status",

mediapipe/tasks/cc/core/model_resources.cc

@@ -33,6 +33,7 @@ limitations under the License.
 #include "mediapipe/tasks/cc/core/proto/external_file.pb.h"
 #include "mediapipe/tasks/cc/metadata/metadata_extractor.h"
 #include "mediapipe/util/resource_util.h"
+#include "mediapipe/util/resource_util_custom.h"
 #include "mediapipe/util/tflite/error_reporter.h"
 #include "tensorflow/lite/core/api/error_reporter.h"
 #include "tensorflow/lite/core/api/op_resolver.h"
@@ -99,21 +100,20 @@ const tflite::Model* ModelResources::GetTfLiteModel() const {
 
 absl::Status ModelResources::BuildModelFromExternalFileProto() {
   if (model_file_->has_file_name()) {
-#ifdef __EMSCRIPTEN__
+    if (HasCustomGlobalResourceProvider()) {
-    // In browsers, the model file may require a custom ResourceProviderFn to
+      // If the model contents are provided via a custom ResourceProviderFn, the
-    // provide the model content. The open() method may not work in this case.
+      // open() method may not work. Thus, loads the model content from the
-    // Thus, loading the model content from the model file path in advance with
+      // model file path in advance with the help of GetResourceContents.
-    // the help of GetResourceContents.
+      MP_RETURN_IF_ERROR(GetResourceContents(
-    MP_RETURN_IF_ERROR(mediapipe::GetResourceContents(
           model_file_->file_name(), model_file_->mutable_file_content()));
       model_file_->clear_file_name();
-#else
+    } else {
       // If the model file name is a relative path, searches the file in a
       // platform-specific location and returns the absolute path on success.
       ASSIGN_OR_RETURN(std::string path_to_resource,
-                     mediapipe::PathToResourceAsFile(model_file_->file_name()));
+                       PathToResourceAsFile(model_file_->file_name()));
       model_file_->set_file_name(path_to_resource);
-#endif  // __EMSCRIPTEN__
+    }
   }
   ASSIGN_OR_RETURN(
       model_file_handler_,

mediapipe/util/resource_util.cc

@@ -37,6 +37,8 @@ absl::Status GetResourceContents(const std::string& path, std::string* output,
   return internal::DefaultGetResourceContents(path, output, read_as_binary);
 }
 
+bool HasCustomGlobalResourceProvider() { return resource_provider_ != nullptr; }
+
 void SetCustomGlobalResourceProvider(ResourceProviderFn fn) {
   resource_provider_ = std::move(fn);
 }

mediapipe/util/resource_util_custom.h

@@ -10,6 +10,9 @@ namespace mediapipe {
 typedef std::function<absl::Status(const std::string&, std::string*)>
     ResourceProviderFn;
 
+// Returns true if files are provided via a custom resource provider.
+bool HasCustomGlobalResourceProvider();
+
 // Overrides the behavior of GetResourceContents.
 void SetCustomGlobalResourceProvider(ResourceProviderFn fn);