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37 lines
1.0 KiB
37 lines
1.0 KiB
// Copyright (c) 2016 Network
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef FRONTEND_FFT_H_
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#define FRONTEND_FFT_H_
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#ifndef M_PI
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#define M_PI 3.1415926535897932384626433832795
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#endif
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#ifndef M_2PI
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#define M_2PI 6.283185307179586476925286766559005
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#endif
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namespace wenet {
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// Fast Fourier Transform
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void make_sintbl(int n, float* sintbl);
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void make_bitrev(int n, int* bitrev);
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int fft(const int* bitrev, const float* sintbl, float* x, float* y, int n);
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} // namespace wenet
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#endif // FRONTEND_FFT_H_
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