chromium/third_party/tflite_support/src/tensorflow_lite_support/python/task/audio/pybinds/_pywrap_audio_classifier.cc

/* Copyright 2022 The TensorFlow Authors. All Rights Reserved.

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 "pybind11/pybind11.h"
#include "pybind11_protobuf/native_proto_caster.h"  // from @pybind11_protobuf
#include "tensorflow_lite_support/cc/task/audio/audio_classifier.h"
#include "tensorflow_lite_support/cc/task/audio/core/audio_buffer.h"
#include "tensorflow_lite_support/cc/task/audio/proto/classifications_proto_inc.h"
#include "tensorflow_lite_support/cc/task/processor/proto/classification_options.pb.h"
#include "tensorflow_lite_support/cc/task/processor/proto/classifications.pb.h"
#include "tensorflow_lite_support/cc/task/processor/proto/classifications.pb.h"
#include "tensorflow_lite_support/python/task/core/pybinds/task_utils.h"

namespace tflite {
namespace task {
namespace audio {

namespace {
namespace py = ::pybind11;
using PythonBaseOptions = ::tflite::python::task::core::BaseOptions;
using CppBaseOptions = ::tflite::task::core::BaseOptions;
}  // namespace

PYBIND11_MODULE(_pywrap_audio_classifier, m) {
  // python wrapper for C++ AudioClassifier class which shouldn't be directly
  // used by the users.
  pybind11_protobuf::ImportNativeProtoCasters();

  py::class_<AudioClassifier>(m, "AudioClassifier")
      .def_static(
          "create_from_options",
          [](const PythonBaseOptions& base_options,
             const processor::ClassificationOptions& classification_options) {
            AudioClassifierOptions options;
            auto cpp_base_options =
                core::convert_to_cpp_base_options(base_options);
            options.set_allocated_base_options(cpp_base_options.release());

            if (classification_options.has_display_names_locale()) {
              options.set_display_names_locale(
                  classification_options.display_names_locale());
            }
            if (classification_options.has_max_results()) {
              options.set_max_results(classification_options.max_results());
            }
            if (classification_options.has_score_threshold()) {
              options.set_score_threshold(
                  classification_options.score_threshold());
            }
            options.mutable_class_name_allowlist()->CopyFrom(
                classification_options.class_name_allowlist());
            options.mutable_class_name_denylist()->CopyFrom(
                classification_options.class_name_denylist());

            auto classifier = AudioClassifier::CreateFromOptions(options);
            return core::get_value(classifier);
          })
      .def("classify",
           [](AudioClassifier& self, const AudioBuffer& audio_buffer)
               -> processor::ClassificationResult {
             auto core_classification_result = self.Classify(audio_buffer);
             // Convert from core::ClassificationResult to
             // processor::ClassificationResult.
             processor::ClassificationResult classification_result;
             classification_result.ParseFromString(
                 core::get_value(core_classification_result)
                     .SerializeAsString());
             return classification_result;
           })
      .def("get_required_audio_format",
           [](AudioClassifier& self) -> AudioBuffer::AudioFormat {
             auto audio_format = self.GetRequiredAudioFormat();
             return core::get_value(audio_format);
           })
      .def("get_required_input_buffer_size",
           &AudioClassifier::GetRequiredInputBufferSize);
}

}  // namespace audio
}  // namespace task
}  // namespace tflite