Added files for the Language Detector C API and tests

mediapipe/tasks/c/components/containers/BUILD

@@ -98,3 +98,18 @@ cc_test(
         "@com_google_googletest//:gtest_main",
     ],
 )
+
+cc_library(
+    name = "language_detection_result",
+    hdrs = ["language_detection_result.h"],
+)
+
+cc_library(
+    name = "language_detection_result_converter",
+    srcs = ["language_detection_result_converter.cc"],
+    hdrs = ["language_detection_result_converter.h"],
+    deps = [
+        ":language_detection_result",
+        "//mediapipe/tasks/cc/text/language_detector:language_detector",
+    ],
+)

mediapipe/tasks/c/components/containers/language_detection_result.h

@@ -0,0 +1,46 @@
+/* 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.
+==============================================================================*/
+
+#ifndef MEDIAPIPE_TASKS_C_COMPONENTS_CONTAINERS_LANGUAGE_DETECTION_RESULT_H_
+#define MEDIAPIPE_TASKS_C_COMPONENTS_CONTAINERS_LANGUAGE_DETECTION_RESULT_H_
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// A language code and its probability.
+struct LanguageDetectorPrediction {
+  // An i18n language / locale code, e.g. "en" for English, "uz" for Uzbek,
+  // "ja"-Latn for Japanese (romaji).
+  char* language_code;
+
+  float probability;
+};
+
+// Task output.
+struct LanguageDetectorResult {
+  struct LanguageDetectorPrediction* predictions;
+
+  // Keep the count of predictions.
+  uint32_t predictions_count;
+};
+
+#ifdef __cplusplus
+}  // extern C
+#endif
+
+#endif  // MEDIAPIPE_TASKS_C_COMPONENTS_CONTAINERS_LANGUAGE_DETECTION_RESULT_H_

mediapipe/tasks/c/components/containers/language_detection_result_converter.cc

@@ -0,0 +1,55 @@
+/* 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.
+==============================================================================*/
+
+#include "mediapipe/tasks/c/components/containers/language_detection_result_converter.h"
+
+#include <cstdlib>
+
+#include "mediapipe/tasks/c/components/containers/language_detection_result.h"
+#include "mediapipe/tasks/cc/text/language_detector/language_detector.h"
+
+namespace mediapipe::tasks::c::components::containers {
+
+void CppConvertToLanguageDetectionResult(
+    const mediapipe::tasks::text::language_detector::LanguageDetectorResult& in,
+    LanguageDetectorResult* out) {
+  out->predictions_count = in.size();
+  out->predictions =
+      out->predictions_count
+          ? new LanguageDetectorPrediction[out->predictions_count]
+          : nullptr;
+
+  for (uint32_t i = 0; i < out->predictions_count; ++i) {
+    auto language_detection_prediction_in = in[i];
+    auto& language_detection_prediction_out = out->predictions[i];
+    language_detection_prediction_out.probability =
+        language_detection_prediction_in.probability;
+    language_detection_prediction_out.language_code =
+        strdup(language_detection_prediction_in.language_code.c_str());
+  }
+}
+
+void CppCloseLanguageDetectionResult(LanguageDetectorResult* in) {
+  for (uint32_t i = 0; i < in->predictions_count; ++i) {
+    auto prediction_in = in->predictions[i];
+
+    free(prediction_in.language_code);
+    prediction_in.language_code = nullptr;
+  }
+  delete[] in->predictions;
+  in->predictions = nullptr;
+}
+
+}  // namespace mediapipe::tasks::c::components::containers

mediapipe/tasks/c/components/containers/language_detection_result_converter.h

@@ -0,0 +1,32 @@
+/* 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.
+==============================================================================*/
+
+#ifndef MEDIAPIPE_TASKS_C_COMPONENTS_CONTAINERS_LANGUAGE_DETECTION_RESULT_CONVERTER_H_
+#define MEDIAPIPE_TASKS_C_COMPONENTS_CONTAINERS_LANGUAGE_DETECTION_RESULT_CONVERTER_H_
+
+#include "mediapipe/tasks/c/components/containers/language_detection_result.h"
+#include "mediapipe/tasks/cc/text/language_detector/language_detector.h"
+
+namespace mediapipe::tasks::c::components::containers {
+
+void CppConvertToLanguageDetectionResult(
+    const mediapipe::tasks::text::language_detector::LanguageDetectorResult& in,
+    LanguageDetectorResult* out);
+
+void CppCloseLanguageDetectionResult(LanguageDetectorResult* in);
+
+}  // namespace mediapipe::tasks::c::components::containers
+
+#endif  // MEDIAPIPE_TASKS_C_COMPONENTS_CONTAINERS_LANGUAGE_DETECTION_RESULT_CONVERTER_H_

mediapipe/tasks/c/text/language_detector/BUILD

@@ -0,0 +1,85 @@
+# 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.
+
+package(default_visibility = ["//mediapipe/tasks:internal"])
+
+licenses(["notice"])
+
+cc_library(
+    name = "language_detector_lib",
+    srcs = ["language_detector.cc"],
+    hdrs = ["language_detector.h"],
+    visibility = ["//visibility:public"],
+    deps = [
+        "//mediapipe/tasks/c/components/containers:language_detection_result",
+        "//mediapipe/tasks/c/components/containers:language_detection_result_converter",
+        "//mediapipe/tasks/c/components/processors:classifier_options",
+        "//mediapipe/tasks/c/components/processors:classifier_options_converter",
+        "//mediapipe/tasks/c/core:base_options",
+        "//mediapipe/tasks/c/core:base_options_converter",
+        "//mediapipe/tasks/cc/text/language_detector",
+        "@com_google_absl//absl/log:absl_log",
+        "@com_google_absl//absl/status",
+    ],
+    alwayslink = 1,
+)
+
+# bazel build -c opt --linkopt -s --strip always --define MEDIAPIPE_DISABLE_GPU=1 \
+# //mediapipe/tasks/c/text/language_detector:liblanguage_detector.so
+cc_binary(
+    name = "liblanguage_detector.so",
+    linkopts = [
+        "-Wl,-soname=liblanguage_detector.so",
+        "-fvisibility=hidden",
+    ],
+    linkshared = True,
+    tags = [
+        "manual",
+        "nobuilder",
+        "notap",
+    ],
+    deps = [":language_detector_lib"],
+)
+
+# bazel build --config darwin_arm64 -c opt --strip always --define MEDIAPIPE_DISABLE_GPU=1 \
+# //mediapipe/tasks/c/text/language_detector:liblanguage_detector.dylib
+cc_binary(
+    name = "liblanguage_detector.dylib",
+    linkopts = [
+        "-Wl,-install_name,liblanguage_detector.dylib",
+        "-fvisibility=hidden",
+    ],
+    linkshared = True,
+    tags = [
+        "manual",
+        "nobuilder",
+        "notap",
+    ],
+    deps = [":language_detector_lib"],
+)
+
+cc_test(
+    name = "language_detector_test",
+    srcs = ["language_detector_test.cc"],
+    data = ["//mediapipe/tasks/testdata/text:language_detector"],
+    linkstatic = 1,
+    deps = [
+        ":language_detector_lib",
+        "//mediapipe/framework/deps:file_path",
+        "//mediapipe/framework/port:gtest",
+        "@com_google_absl//absl/flags:flag",
+        "@com_google_absl//absl/strings",
+        "@com_google_googletest//:gtest_main",
+    ],
+)

mediapipe/tasks/c/text/language_detector/language_detector.cc

@@ -0,0 +1,126 @@
+/* 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.
+==============================================================================*/
+
+#include "mediapipe/tasks/c/text/language_detector/language_detector.h"
+
+#include <memory>
+#include <utility>
+
+#include "absl/log/absl_log.h"
+#include "absl/status/status.h"
+#include "mediapipe/tasks/c/components/containers/language_detection_result_converter.h"
+#include "mediapipe/tasks/c/components/processors/classifier_options.h"
+#include "mediapipe/tasks/c/components/processors/classifier_options_converter.h"
+#include "mediapipe/tasks/c/core/base_options.h"
+#include "mediapipe/tasks/c/core/base_options_converter.h"
+#include "mediapipe/tasks/cc/text/language_detector/language_detector.h"
+
+namespace mediapipe::tasks::c::text::language_detector {
+
+namespace {
+
+using ::mediapipe::tasks::c::components::containers::
+    CppCloseLanguageDetectionResult;
+using ::mediapipe::tasks::c::components::containers::
+    CppConvertToLanguageDetectionResult;
+using ::mediapipe::tasks::c::components::processors::
+    CppConvertToClassifierOptions;
+using ::mediapipe::tasks::c::core::CppConvertToBaseOptions;
+using ::mediapipe::tasks::text::language_detector::LanguageDetector;
+
+int CppProcessError(absl::Status status, char** error_msg) {
+  if (error_msg) {
+    *error_msg = strdup(status.ToString().c_str());
+  }
+  return status.raw_code();
+}
+
+}  // namespace
+
+LanguageDetector* CppLanguageDetectorCreate(
+    const LanguageDetectorOptions& options, char** error_msg) {
+  auto cpp_options = std::make_unique<
+      ::mediapipe::tasks::text::language_detector::LanguageDetectorOptions>();
+
+  CppConvertToBaseOptions(options.base_options, &cpp_options->base_options);
+  CppConvertToClassifierOptions(options.classifier_options,
+                                &cpp_options->classifier_options);
+
+  auto detector = LanguageDetector::Create(std::move(cpp_options));
+  if (!detector.ok()) {
+    ABSL_LOG(ERROR) << "Failed to create LanguageDetector: "
+                    << detector.status();
+    CppProcessError(detector.status(), error_msg);
+    return nullptr;
+  }
+  return detector->release();
+}
+
+int CppLanguageDetectorDetect(void* detector, const char* utf8_str,
+                              LanguageDetectorResult* result,
+                              char** error_msg) {
+  auto cpp_detector = static_cast<LanguageDetector*>(detector);
+  auto cpp_result = cpp_detector->Detect(utf8_str);
+  if (!cpp_result.ok()) {
+    ABSL_LOG(ERROR) << "Language Detection failed: " << cpp_result.status();
+    return CppProcessError(cpp_result.status(), error_msg);
+  }
+
+  CppConvertToLanguageDetectionResult(*cpp_result, result);
+  return 0;
+}
+
+void CppLanguageDetectorCloseResult(LanguageDetectorResult* result) {
+  CppCloseLanguageDetectionResult(result);
+}
+
+int CppLanguageDetectorClose(void* detector, char** error_msg) {
+  auto cpp_detector = static_cast<LanguageDetector*>(detector);
+  auto result = cpp_detector->Close();
+  if (!result.ok()) {
+    ABSL_LOG(ERROR) << "Failed to close LanguageDetector: " << result;
+    return CppProcessError(result, error_msg);
+  }
+  delete cpp_detector;
+  return 0;
+}
+
+}  // namespace mediapipe::tasks::c::text::language_detector
+
+extern "C" {
+
+void* language_detector_create(struct LanguageDetectorOptions* options,
+                               char** error_msg) {
+  return mediapipe::tasks::c::text::language_detector::
+      CppLanguageDetectorCreate(*options, error_msg);
+}
+
+int language_detector_detect(void* detector, const char* utf8_str,
+                             LanguageDetectorResult* result, char** error_msg) {
+  return mediapipe::tasks::c::text::language_detector::
+      CppLanguageDetectorDetect(detector, utf8_str, result, error_msg);
+}
+
+void language_detector_close_result(LanguageDetectorResult* result) {
+  mediapipe::tasks::c::text::language_detector::CppLanguageDetectorCloseResult(
+      result);
+}
+
+int language_detector_close(void* detector, char** error_ms) {
+  return mediapipe::tasks::c::text::language_detector::CppLanguageDetectorClose(
+      detector, error_ms);
+}
+
+}  // extern "C"

mediapipe/tasks/c/text/language_detector/language_detector.h

@@ -0,0 +1,73 @@
+/* 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.
+==============================================================================*/
+
+#ifndef MEDIAPIPE_TASKS_C_TEXT_LANGUAGE_DETECTOR_LANGUAGE_DETECTOR_H_
+#define MEDIAPIPE_TASKS_C_TEXT_LANGUAGE_DETECTOR_LANGUAGE_DETECTOR_H_
+
+#include "mediapipe/tasks/c/components/containers/language_detection_result.h"
+#include "mediapipe/tasks/c/components/processors/classifier_options.h"
+#include "mediapipe/tasks/c/core/base_options.h"
+
+#ifndef MP_EXPORT
+#define MP_EXPORT __attribute__((visibility("default")))
+#endif  // MP_EXPORT
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// The options for configuring a MediaPipe language detector task.
+struct LanguageDetectorOptions {
+  // Base options for configuring MediaPipe Tasks, such as specifying the model
+  // file with metadata, accelerator options, op resolver, etc.
+  struct BaseOptions base_options;
+
+  // Options for configuring the detector behavior, such as score threshold,
+  // number of results, etc.
+  struct ClassifierOptions classifier_options;
+};
+
+// Creates a LanguageDetector from the provided `options`.
+// Returns a pointer to the language detector on success.
+// If an error occurs, returns `nullptr` and sets the error parameter to an
+// an error message (if `error_msg` is not nullptr). You must free the memory
+// allocated for the error message.
+MP_EXPORT void* language_detector_create(
+    struct LanguageDetectorOptions* options, char** error_msg = nullptr);
+
+// Performs language detection on the input `text`. Returns `0` on success.
+// If an error occurs, returns an error code and sets the error parameter to an
+// an error message (if `error_msg` is not nullptr). You must free the memory
+// allocated for the error message.
+MP_EXPORT int language_detector_detect(void* detector, const char* utf8_str,
+                                       LanguageDetectorResult* result,
+                                       char** error_msg = nullptr);
+
+// Frees the memory allocated inside a LanguageDetectorResult result. Does not
+// free the result pointer itself.
+MP_EXPORT void language_detector_close_result(LanguageDetectorResult* result);
+
+// Shuts down the LanguageDetector when all the work is done. Frees all memory.
+// If an error occurs, returns an error code and sets the error parameter to an
+// an error message (if `error_msg` is not nullptr). You must free the memory
+// allocated for the error message.
+MP_EXPORT int language_detector_close(void* detector,
+                                      char** error_msg = nullptr);
+
+#ifdef __cplusplus
+}  // extern C
+#endif
+
+#endif  // MEDIAPIPE_TASKS_C_TEXT_LANGUAGE_DETECTOR_LANGUAGE_DETECTOR_H_

mediapipe/tasks/c/text/language_detector/language_detector_test.cc

@@ -0,0 +1,87 @@
+/* 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.
+==============================================================================*/
+
+#include "mediapipe/tasks/c/text/language_detector/language_detector.h"
+
+#include <cstdlib>
+#include <string>
+
+#include "absl/flags/flag.h"
+#include "absl/strings/string_view.h"
+#include "mediapipe/framework/deps/file_path.h"
+#include "mediapipe/framework/port/gmock.h"
+#include "mediapipe/framework/port/gtest.h"
+
+namespace {
+
+using ::mediapipe::file::JoinPath;
+using testing::HasSubstr;
+
+constexpr char kTestDataDirectory[] = "/mediapipe/tasks/testdata/text/";
+constexpr char kTestLanguageDetectorModelPath[] = "language_detector.tflite";
+constexpr char kTestString[] =
+    "Il y a beaucoup de bouches qui parlent et fort peu "
+    "de têtes qui pensent.";
+constexpr float kPrecision = 1e-6;
+
+std::string GetFullPath(absl::string_view file_name) {
+  return JoinPath("./", kTestDataDirectory, file_name);
+}
+
+TEST(LanguageDetectorTest, SmokeTest) {
+  std::string model_path = GetFullPath(kTestLanguageDetectorModelPath);
+  LanguageDetectorOptions options = {
+      /* base_options= */ {/* model_asset_buffer= */ nullptr,
+                           /* model_asset_path= */ model_path.c_str()},
+      /* classifier_options= */
+      {/* display_names_locale= */ nullptr,
+       /* max_results= */ -1,
+       /* score_threshold= */ 0.0,
+       /* category_allowlist= */ nullptr,
+       /* category_allowlist_count= */ 0,
+       /* category_denylist= */ nullptr,
+       /* category_denylist_count= */ 0},
+  };
+
+  void* detector = language_detector_create(&options);
+  EXPECT_NE(detector, nullptr);
+
+  LanguageDetectorResult result;
+  language_detector_detect(detector, kTestString, &result);
+  EXPECT_EQ(std::string(result.predictions[0].language_code), "fr");
+  EXPECT_NEAR(result.predictions[0].probability, 0.999781, kPrecision);
+
+  language_detector_close_result(&result);
+  language_detector_close(detector);
+}
+
+TEST(LanguageDetectorTest, ErrorHandling) {
+  // It is an error to set neither the asset buffer nor the path.
+  LanguageDetectorOptions options = {
+      /* base_options= */ {/* model_asset_buffer= */ nullptr,
+                           /* model_asset_path= */ nullptr},
+      /* classifier_options= */ {},
+  };
+
+  char* error_msg;
+  void* detector = language_detector_create(&options, &error_msg);
+  EXPECT_EQ(detector, nullptr);
+
+  EXPECT_THAT(error_msg, HasSubstr("INVALID_ARGUMENT"));
+
+  free(error_msg);
+}
+
+}  // namespace