Added iOS task runner

mediapipe/tasks/ios/core/sources/MPPTaskRunner.h

@@ -0,0 +1,47 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// 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.
+
+#import <Foundation/Foundation.h>
+
+#include "mediapipe/framework/calculator.pb.h"
+#include "mediapipe/tasks/cc/core/task_runner.h"
+
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * This class is used to create and call appropriate methods on the C++ Task Runner.
+ */
+@interface MPPTaskRunner : NSObject
+/**
+ * Initializes a new `MPPTaskRunner` with the mediapipe task graph config proto.
+ *
+ * @param graphConfig A mediapipe task graph config proto.
+ *
+ * @return An instance of `MPPTaskRunner` initialized to the given graph config proto.
+ */
+- (instancetype)initWithCalculatorGraphConfig:(mediapipe::CalculatorGraphConfig)graphConfig
+                                        error:(NSError **)error;
+
+- (absl::StatusOr<mediapipe::tasks::core::PacketMap>)process:(const mediapipe::tasks::core::PacketMap&)packetMap error:(NSError **)error;
+
+- (void)close;
+
+- (instancetype)init NS_UNAVAILABLE;
+
++ (instancetype)new NS_UNAVAILABLE;
+
+@end
+
+NS_ASSUME_NONNULL_END

mediapipe/tasks/ios/core/sources/MPPTaskRunner.mm

@@ -0,0 +1,56 @@
+// Copyright 2022 The MediaPipe Authors.
+//
+// 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.
+
+#import "mediapipe/tasks/ios/core/sources/MPPTaskRunner.h"
+#import "mediapipe/tasks/ios/common/utils/sources/MPPCommonUtils.h"
+
+namespace {
+using ::mediapipe::CalculatorGraphConfig;
+using ::mediapipe::Packet;
+using ::mediapipe::tasks::core::PacketMap;
+using TaskRunnerCpp = ::mediapipe::tasks::core::TaskRunner;
+}  // namespace
+
+@interface MPPTaskRunner () {
+  // Cpp Task Runner
+  std::unique_ptr<TaskRunnerCpp> _cppTaskRunner;
+}
+@end
+
+@implementation MPPTaskRunner
+
+- (instancetype)initWithCalculatorGraphConfig:(CalculatorGraphConfig)graphConfig
+                                        error:(NSError **)error {
+  self = [super init];
+  if (self) {
+    auto taskRunnerResult = TaskRunnerCpp::Create(std::move(graphConfig));
+
+    if (![MPPCommonUtils checkCppError:taskRunnerResult.status() toError:error]) {
+      return nil;
+    }
+
+    _cppTaskRunner = std::move(taskRunnerResult.value());
+  }
+  return self;
+}
+
+- (absl::StatusOr<PacketMap>)process:(const PacketMap&)packetMap {
+  return _cppTaskRunner->Process(packetMap);
+}
+
+- (void)close {
+  _cppTaskRunner->Close();
+}
+
+@end