mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-30 11:22:14 +00:00
58bd7d97a4
Duplicates of the standard JPEG quantization tables were found in the AGM, MSS34(dsp), NUV and VP31 codecs. This patch elimates those duplicates, placing a single copy in jpegquanttables.c.
94 lines
3.6 KiB
C
94 lines
3.6 KiB
C
/*
|
|
* 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;
|
|
}
|
|
}
|