1/* Copyright 2017 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16// Basic minimal DCT class for MFCC speech processing.
17
18#ifndef TENSORFLOW_CORE_KERNELS_MFCC_DCT_H_
19#define TENSORFLOW_CORE_KERNELS_MFCC_DCT_H_
20
21#include <vector>
22
23#include "tensorflow/core/framework/op_kernel.h"
24
25namespace tensorflow {
26
27class MfccDct {
28 public:
29 MfccDct();
30 bool Initialize(int input_length, int coefficient_count);
31 void Compute(const std::vector<double>& input,
32 std::vector<double>* output) const;
33
34 private:
35 bool initialized_;
36 int coefficient_count_;
37 int input_length_;
38 std::vector<std::vector<double> > cosines_;
39 TF_DISALLOW_COPY_AND_ASSIGN(MfccDct);
40};
41
42} // namespace tensorflow
43
44#endif // TENSORFLOW_CORE_KERNELS_MFCC_DCT_H_
45