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/*
* Common stuff for some Microsoft Screen codecs
* Copyright (C) 2012 Konstantin Shishkov
*
* 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 <stdint.h>
#include "libavutil/common.h"
#include "mss34dsp.h"
#include "jpegquanttables.h"
void ff_mss34_gen_quant_mat(uint16_t *qmat, int quality, int luma)
{
int i;
const uint8_t *qsrc = luma ? ff_mjpeg_std_luminance_quant_tbl : ff_mjpeg_std_chrominance_quant_tbl;
if (quality >= 50) {
int scale = 200 - 2 * quality;
for (i = 0; i < 64; i++)
qmat[i] = (qsrc[i] * scale + 50) / 100;
} else {
for (i = 0; i < 64; i++)
qmat[i] = (5000 * qsrc[i] / quality + 50) / 100;
}
}
#define DCT_TEMPLATE(blk, step, SOP, shift) \
const unsigned t0 =-39409U * blk[7 * step] - 58980U * blk[1 * step]; \
const unsigned t1 = 39410U * blk[1 * step] - 58980U * blk[7 * step]; \
const unsigned t2 =-33410U * blk[5 * step] -167963U * blk[3 * step]; \
const unsigned t3 = 33410U * blk[3 * step] -167963U * blk[5 * step]; \
const unsigned t4 = blk[3 * step] + blk[7 * step]; \
const unsigned t5 = blk[1 * step] + blk[5 * step]; \
const unsigned t6 = 77062U * t4 + 51491U * t5; \
const unsigned t7 = 77062U * t5 - 51491U * t4; \
const unsigned t8 = 35470U * blk[2 * step] - 85623U * blk[6 * step]; \
const unsigned t9 = 35470U * blk[6 * step] + 85623U * blk[2 * step]; \
const unsigned tA = SOP(blk[0 * step] - blk[4 * step]); \
const unsigned tB = SOP(blk[0 * step] + blk[4 * step]); \
\
blk[0 * step] = (int)( t1 + t6 + t9 + tB) >> shift; \
blk[1 * step] = (int)( t3 + t7 + t8 + tA) >> shift; \
blk[2 * step] = (int)( t2 + t6 - t8 + tA) >> shift; \
blk[3 * step] = (int)( t0 + t7 - t9 + tB) >> shift; \
blk[4 * step] = (int)(-(t0 + t7) - t9 + tB) >> shift; \
blk[5 * step] = (int)(-(t2 + t6) - t8 + tA) >> shift; \
blk[6 * step] = (int)(-(t3 + t7) + t8 + tA) >> shift; \
blk[7 * step] = (int)(-(t1 + t6) + t9 + tB) >> shift; \
#define SOP_ROW(a) (((a) * (1U << 16)) + 0x2000)
#define SOP_COL(a) (((a) + 32) * (1U << 16))
void ff_mss34_dct_put(uint8_t *dst, ptrdiff_t stride, int *block)
{
int i, j;
int *ptr;
ptr = block;
for (i = 0; i < 8; i++) {
DCT_TEMPLATE(ptr, 1, SOP_ROW, 13);
ptr += 8;
}
ptr = block;
for (i = 0; i < 8; i++) {
DCT_TEMPLATE(ptr, 8, SOP_COL, 22);
ptr++;
}
ptr = block;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++)
dst[i] = av_clip_uint8(ptr[i] + 128);
dst += stride;
ptr += 8;
}
}
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