mirror of
https://github.com/librempeg/librempeg
synced 2024-11-23 11:39:47 +00:00
115 lines
4.1 KiB
C
115 lines
4.1 KiB
C
/*
|
|
* Common stuff for some Microsoft Screen codecs
|
|
* Copyright (C) 2012 Konstantin Shishkov
|
|
*
|
|
* This file is part of Libav.
|
|
*
|
|
* Libav 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.
|
|
*
|
|
* Libav 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 Libav; 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"
|
|
|
|
static const uint8_t luma_quant[64] = {
|
|
16, 11, 10, 16, 24, 40, 51, 61,
|
|
12, 12, 14, 19, 26, 58, 60, 55,
|
|
14, 13, 16, 24, 40, 57, 69, 56,
|
|
14, 17, 22, 29, 51, 87, 80, 62,
|
|
18, 22, 37, 56, 68, 109, 103, 77,
|
|
24, 35, 55, 64, 81, 104, 113, 92,
|
|
49, 64, 78, 87, 103, 121, 120, 101,
|
|
72, 92, 95, 98, 112, 100, 103, 99
|
|
};
|
|
|
|
static const uint8_t chroma_quant[64] = {
|
|
17, 18, 24, 47, 99, 99, 99, 99,
|
|
18, 21, 26, 66, 99, 99, 99, 99,
|
|
24, 26, 56, 99, 99, 99, 99, 99,
|
|
47, 66, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99,
|
|
99, 99, 99, 99, 99, 99, 99, 99
|
|
};
|
|
|
|
void ff_mss34_gen_quant_mat(uint16_t *qmat, int quality, int luma)
|
|
{
|
|
int i;
|
|
const uint8_t *qsrc = luma ? luma_quant : chroma_quant;
|
|
|
|
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 int t0 = -39409 * blk[7 * step] - 58980 * blk[1 * step]; \
|
|
const int t1 = 39410 * blk[1 * step] - 58980 * blk[7 * step]; \
|
|
const int t2 = -33410 * blk[5 * step] - 167963 * blk[3 * step]; \
|
|
const int t3 = 33410 * blk[3 * step] - 167963 * blk[5 * step]; \
|
|
const int t4 = blk[3 * step] + blk[7 * step]; \
|
|
const int t5 = blk[1 * step] + blk[5 * step]; \
|
|
const int t6 = 77062 * t4 + 51491 * t5; \
|
|
const int t7 = 77062 * t5 - 51491 * t4; \
|
|
const int t8 = 35470 * blk[2 * step] - 85623 * blk[6 * step]; \
|
|
const int t9 = 35470 * blk[6 * step] + 85623 * blk[2 * step]; \
|
|
const int tA = SOP(blk[0 * step] - blk[4 * step]); \
|
|
const int tB = SOP(blk[0 * step] + blk[4 * step]); \
|
|
\
|
|
blk[0 * step] = ( t1 + t6 + t9 + tB) >> shift; \
|
|
blk[1 * step] = ( t3 + t7 + t8 + tA) >> shift; \
|
|
blk[2 * step] = ( t2 + t6 - t8 + tA) >> shift; \
|
|
blk[3 * step] = ( t0 + t7 - t9 + tB) >> shift; \
|
|
blk[4 * step] = (-(t0 + t7) - t9 + tB) >> shift; \
|
|
blk[5 * step] = (-(t2 + t6) - t8 + tA) >> shift; \
|
|
blk[6 * step] = (-(t3 + t7) + t8 + tA) >> shift; \
|
|
blk[7 * step] = (-(t1 + t6) + t9 + tB) >> shift; \
|
|
|
|
#define SOP_ROW(a) ((a) << 16) + 0x2000
|
|
#define SOP_COL(a) ((a + 32) << 16)
|
|
|
|
void ff_mss34_dct_put(uint8_t *dst, int 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;
|
|
}
|
|
}
|