Added language detector result helpers

mediapipe/tasks/ios/text/language_detector/utils/BUILD

@@ -30,3 +30,15 @@ objc_library(
         "//mediapipe/tasks/ios/text/language_detector:MPPLanguageDetectorOptions",
     ],
 )
+
+objc_library(
+    name = "MPPLanguageDetectorResultHelpers",
+    srcs = ["sources/MPPLanguageDetectorResult+Helpers.mm"],
+    hdrs = ["sources/MPPLanguageDetectorResult+Helpers.h"],
+    deps = [
+        "//mediapipe/framework:packet",
+        "//mediapipe/tasks/cc/components/containers/proto:classifications_cc_proto",
+        "//mediapipe/tasks/ios/components/containers/utils:MPPClassificationResultHelpers",
+        "//mediapipe/tasks/ios/text/language_detector:MPPLanguageDetectorResult",
+    ],
+)

mediapipe/tasks/ios/text/language_detector/utils/sources/MPPLanguageDetectorResult+Helpers.h

@@ -0,0 +1,28 @@
+// Copyright 2023 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/text/language_Detector/sources/MPPLanguageDetectorResult.h"
+
+#include "mediapipe/framework/packet.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface MPPLanguageDetectorResult (Helpers)
+
++ (MPPLanguageDetectorResult *)languageDetectorResultWithClassificationsPacket:
+    (const mediapipe::Packet &)packet;
+
+@end
+
+NS_ASSUME_NONNULL_END

mediapipe/tasks/ios/text/language_detector/utils/sources/MPPLanguageDetectorResult+Helpers.mm

@@ -0,0 +1,61 @@
+// Copyright 2023 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/components/containers/utils/sources/MPPClassificationResult+Helpers.h"
+#import "mediapipe/tasks/ios/text/language_detector/utils/sources/MPPLanguageDetectorResult+Helpers.h"
+
+#include "mediapipe/tasks/cc/components/containers/proto/classifications.pb.h"
+
+static const int kMicroSecondsPerMilliSecond = 1000;
+
+namespace {
+using ClassificationResultProto =
+    ::mediapipe::tasks::components::containers::proto::ClassificationResult;
+using ::mediapipe::Packet;
+}  // namespace
+
+#define int kMicroSecondsPerMilliSecond = 1000;
+
+@implementation MPPLanguageDetectorResult (Helpers)
+
++ (MPPLanguageDetectorResult *)languageDetectorResultWithClassificationsPacket:
+    (const mediapipe::Packet &)packet {
+  MPPClassificationResult *classificationResult = [MPPClassificationResult
+      classificationResultWithProto:packet.Get<ClassificationResultProto>()];
+
+  return [MPPLanguageDetectorResult
+      languageDetectorResultWithClassificationResult:classificationResult
+                             timestampInMilliseconds:(NSInteger)(packet.Timestamp().Value() /
+                                                                 kMicroSecondsPerMilliSecond)];
+}
+
++ (MPPLanguageDetectorResult *)
+    languageDetectorResultWithClassificationResult:(MPPClassificationResult *)classificationResult
+                           timestampInMilliseconds:(NSInteger)timestampInMilliseconds {
+  NSArray<MPPLanguagePrediction *> *languagePredictions =
+      [NSMutableArray arrayWithCapacity:classificationResult.classifications.count];
+
+  if (classificationResult.classifications.count > 0) {
+    for (MPPCategory *category in classificationResult.classifications[0].categories) {
+      MPPLanguagePrediction *languagePrediction =
+          [[MPPLanguagePrediction alloc] initWithLanguageCode:category.categoryName
+                                                  probability:category.score];
+    }
+  }
+
+  return [[MPPLanguageDetectorResult alloc] initWithLanguagePredictions:languagePredictions
+                                                timestampInMilliseconds:timestampInMilliseconds];
+}
+
+@end