source/PaddleOCR/deploy/cpp_infer/src/common/image_batch_sampler.h

// Copyright (c) 2025 PaddlePaddle 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.

#pragma once

#include <opencv2/opencv.hpp>
#include <set>
#include <string>
#include <vector>

#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "src/base/base_batch_sampler.h"

class ImageBatchSampler : public BaseBatchSampler {
public:
  explicit ImageBatchSampler(int batch_size = 1);
  virtual ~ImageBatchSampler() {} //这里还没调研怎么实现  ？？？

  absl::StatusOr<std::vector<std::vector<cv::Mat>>>
  SampleFromString(const std::string &input) override;

  absl::StatusOr<std::vector<std::vector<cv::Mat>>>
  SampleFromVector(const std::vector<std::string> &inputs) override;

  absl::StatusOr<std::vector<std::vector<cv::Mat>>>
  SampleFromMatVector(const std::vector<cv::Mat> &inputs) override;

private:
  static const std::set<std::string> kImgSuffixes;
};