46 lines
1.6 KiB
Plaintext
46 lines
1.6 KiB
Plaintext
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// np_fwht.h
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// Basic implementation of the Fast Walsh-Hadamard Transforms
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//
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// (c) 2016 - Nico Palermo, IV3NWV - Microtelecom Srl, Italy
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// ------------------------------------------------------------------------------
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// This file is part of the qracodes project, a Forward Error Control
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// encoding/decoding package based on Q-ary RA (repeat and accumulate) LDPC codes.
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//
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// qracodes is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// qracodes is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with qracodes source distribution.
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// If not, see <http://www.gnu.org/licenses/>.
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#ifndef _npfwht_h_
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#define _npfwht_h_
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#ifdef __cplusplus
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extern "C" {
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#endif
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void np_fwht(int nlogdim, float *dst, float *src);
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// Compute the Walsh-Hadamard transform of the given data up to a
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// 64-dimensional transform
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//
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// Input parameters:
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// nlogdim: log2 of the transform size. Must be in the range [0..6]
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// src : pointer to the input data buffer.
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// dst : pointer to the output data buffer.
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//
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// src and dst must point to preallocated data buffers of size 2^nlogdim*sizeof(float)
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// src and dst buffers can overlap
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#ifdef __cplusplus
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}
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#endif
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#endif // _npfwht_
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