runtime/conversation/model_data_processor/data_utils.h

// Copyright 2025 The ODML 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 THIRD_PARTY_ODML_LITERT_LM_RUNTIME_CONVERSATION_MODEL_DATA_PROCESSOR_DATA_UTILS_H_
#define THIRD_PARTY_ODML_LITERT_LM_RUNTIME_CONVERSATION_MODEL_DATA_PROCESSOR_DATA_UTILS_H_

#include <memory>

#include "absl/status/statusor.h"  // from @com_google_absl
#include "nlohmann/json_fwd.hpp"  // from @nlohmann_json
#include "runtime/util/memory_mapped_file.h"

namespace litert::lm {

// Loads the item data from the given JSON object to a MemoryMappedFile.
// The expected item content is:
// 1. Text item
//  {
//    "type": "text",
//    "text": "some text"
//  }
//
// 2. Image item
//  {
//    "type": "image",
//    "path": "/file/path/to/image",
//  }
//  {
//    "type": "image",
//    "blob": "base64 encoded image bytes as string",
//  }
//
// 3. Audio item
//  {
//    "type": "audio",
//    "path": "/file/path/to/audio",
//  }
//  {
//    "type": "audio",
//    "blob": "base64 encoded audio bytes as string",
//  }
//
// Note: though we support loading image and audio data from blob, this format
// is less efficient and less favorable.
absl::StatusOr<std::unique_ptr<MemoryMappedFile>> LoadItemData(
    const nlohmann::ordered_json& item);

}  // namespace litert::lm

#endif  // THIRD_PARTY_ODML_LITERT_LM_RUNTIME_CONVERSATION_MODEL_DATA_PROCESSOR_DATA_UTILS_H_