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/*
* JPEG 2000 DSP functions
* Copyright (c) 2007 Kamil Nowosad
* Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "libavutil/attributes.h"
#include "jpeg2000dsp.h"
/* Inverse ICT parameters in float and integer.
* int value = (float value) * (1<<16) */
static const float f_ict_params[4] = {
1.402f,
0.34413f,
0.71414f,
1.772f
};
static const int i_ict_params[4] = {
91881,
22553,
46802,
116130
};
static void ict_float(void *_src0, void *_src1, void *_src2, int csize)
{
float *src0 = _src0, *src1 = _src1, *src2 = _src2;
float i0f, i1f, i2f;
int i;
for (i = 0; i < csize; i++) {
i0f = *src0 + (f_ict_params[0] * *src2);
i1f = *src0 - (f_ict_params[1] * *src1)
- (f_ict_params[2] * *src2);
i2f = *src0 + (f_ict_params[3] * *src1);
*src0++ = i0f;
*src1++ = i1f;
*src2++ = i2f;
}
}
static void ict_int(void *_src0, void *_src1, void *_src2, int csize)
{
int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2;
int32_t i0, i1, i2;
int i;
for (i = 0; i < csize; i++) {
i0 = *src0 + *src2 + (((26345 * *src2) + (1 << 15)) >> 16);
i1 = *src0 - ((int)(((unsigned)i_ict_params[1] * *src1) + (1 << 15)) >> 16)
- (((i_ict_params[2] * *src2) + (1 << 15)) >> 16);
i2 = *src0 + (2 * *src1) + ((int)((-14942U * *src1) + (1 << 15)) >> 16);
*src0++ = i0;
*src1++ = i1;
*src2++ = i2;
}
}
static void rct_int(void *_src0, void *_src1, void *_src2, int csize)
{
int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2;
int32_t i0, i1, i2;
int i;
for (i = 0; i < csize; i++) {
i1 = *src0 - (*src2 + *src1 >> 2);
i0 = i1 + *src2;
i2 = i1 + *src1;
*src0++ = i0;
*src1++ = i1;
*src2++ = i2;
}
}
av_cold void ff_jpeg2000dsp_init(Jpeg2000DSPContext *c)
{
c->mct_decode[FF_DWT97] = ict_float;
c->mct_decode[FF_DWT53] = rct_int;
c->mct_decode[FF_DWT97_INT] = ict_int;
if (ARCH_X86)
ff_jpeg2000dsp_init_x86(c);
}
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