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101 lines
2.8 KiB
101 lines
2.8 KiB
/* |
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* JPEG 2000 DSP functions |
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* Copyright (c) 2007 Kamil Nowosad |
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* Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg 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 GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "config.h" |
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#include "libavutil/attributes.h" |
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#include "jpeg2000dsp.h" |
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/* Inverse ICT parameters in float and integer. |
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* int value = (float value) * (1<<16) */ |
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static const float f_ict_params[4] = { |
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1.402f, |
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0.34413f, |
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0.71414f, |
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1.772f |
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}; |
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static const int i_ict_params[4] = { |
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91881, |
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22553, |
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46802, |
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116130 |
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}; |
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static void ict_float(void *_src0, void *_src1, void *_src2, int csize) |
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{ |
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float *src0 = _src0, *src1 = _src1, *src2 = _src2; |
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float i0f, i1f, i2f; |
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int i; |
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for (i = 0; i < csize; i++) { |
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i0f = *src0 + (f_ict_params[0] * *src2); |
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i1f = *src0 - (f_ict_params[1] * *src1) |
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- (f_ict_params[2] * *src2); |
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i2f = *src0 + (f_ict_params[3] * *src1); |
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*src0++ = i0f; |
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*src1++ = i1f; |
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*src2++ = i2f; |
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} |
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} |
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static void ict_int(void *_src0, void *_src1, void *_src2, int csize) |
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{ |
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int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2; |
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int32_t i0, i1, i2; |
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int i; |
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for (i = 0; i < csize; i++) { |
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i0 = *src0 + *src2 + (((26345 * *src2) + (1 << 15)) >> 16); |
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i1 = *src0 - ((int)(((unsigned)i_ict_params[1] * *src1) + (1 << 15)) >> 16) |
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- (((i_ict_params[2] * *src2) + (1 << 15)) >> 16); |
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i2 = *src0 + (2 * *src1) + ((int)((-14942U * *src1) + (1 << 15)) >> 16); |
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*src0++ = i0; |
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*src1++ = i1; |
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*src2++ = i2; |
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} |
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} |
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static void rct_int(void *_src0, void *_src1, void *_src2, int csize) |
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{ |
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int32_t *src0 = _src0, *src1 = _src1, *src2 = _src2; |
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int32_t i0, i1, i2; |
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int i; |
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for (i = 0; i < csize; i++) { |
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i1 = *src0 - (*src2 + *src1 >> 2); |
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i0 = i1 + *src2; |
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i2 = i1 + *src1; |
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*src0++ = i0; |
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*src1++ = i1; |
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*src2++ = i2; |
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} |
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} |
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av_cold void ff_jpeg2000dsp_init(Jpeg2000DSPContext *c) |
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{ |
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c->mct_decode[FF_DWT97] = ict_float; |
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c->mct_decode[FF_DWT53] = rct_int; |
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c->mct_decode[FF_DWT97_INT] = ict_int; |
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if (ARCH_X86) |
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ff_jpeg2000dsp_init_x86(c); |
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}
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