82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* Project 25 IMBE Encoder/Decoder Fixed-Point implementation
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* Developed by Pavel Yazev E-mail: pyazev@gmail.com
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* Version 1.0 (c) Copyright 2009
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* The software is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Boston, MA
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* 02110-1301, USA.
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*/
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#ifndef _DSP_SUB
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#define _DSP_SUB
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#define CNST_0_5_Q1_15 0x4000
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#define CNST_0_5_Q5_11 0x0400
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#define CNST_1_0_Q1_15 0x7FFF
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//-----------------------------------------------------------------------------
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// PURPOSE:
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// Perform inverse DCT
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//
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//
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// INPUT:
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// in - pointer to input data
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// m_lim - input data's size
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// i_lim - result's size
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// out - pointer to save result
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//
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// OUTPUT:
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// None
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//
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// RETURN:
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// Saved in out result of conversion
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//
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//-----------------------------------------------------------------------------
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void idct(Word16 *in, Word16 m_lim, Word16 i_lim, Word16 *out);
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//-----------------------------------------------------------------------------
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// PURPOSE:
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// Perform DCT
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//
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//
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// INPUT:
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// in - pointer to input data
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// m_lim - input data's size
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// i_lim - result's size
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// out - pointer to save result
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//
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// OUTPUT:
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// None
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//
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// RETURN:
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// Saved in out result of conversion
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//
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//-----------------------------------------------------------------------------
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void dct(Word16 *in, Word16 m_lim, Word16 i_lim, Word16 *out);
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#define FFTLENGTH 256
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void fft_init(void);
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void fft(Word16 *datam1, Word16 nn, Word16 isign);
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void c_fft(Word16 * farray_ptr);
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#endif
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