// Copyright (c) 2022 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 "feat/feature-window.h"
#include <pybind11/pybind11.h>
#include <pybind11/numpy.h>

namespace paddleaudio {

namespace py = pybind11;

template <class F>
class StreamingFeatureTpl {
  public:
    typedef typename F::Options Options;
    StreamingFeatureTpl(const Options& opts);
    bool ComputeFeature(const kaldi::VectorBase<kaldi::BaseFloat>& wav, 
                        kaldi::Vector<kaldi::BaseFloat>* feats);
    void Reset() {
        remained_wav_.Resize(0);
    }

    int Dim() {
      return computer_.Dim();
    }

  private:
    bool Compute(const kaldi::Vector<kaldi::BaseFloat>& waves, 
                 kaldi::Vector<kaldi::BaseFloat>* feats);
    Options opts_;
    kaldi::FeatureWindowFunction window_function_;
    kaldi::Vector<kaldi::BaseFloat> remained_wav_;
    F computer_;
};

}  // namespace ppspeech

#include "kaldi_frontend/feature_common_inl.h"