1/* 2 * Common stuff for some Microsoft Screen codecs 3 * Copyright (C) 2012 Konstantin Shishkov 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include <stdint.h> 23#include "libavutil/common.h" 24#include "mss34dsp.h" 25 26static const uint8_t luma_quant[64] = { 27 16, 11, 10, 16, 24, 40, 51, 61, 28 12, 12, 14, 19, 26, 58, 60, 55, 29 14, 13, 16, 24, 40, 57, 69, 56, 30 14, 17, 22, 29, 51, 87, 80, 62, 31 18, 22, 37, 56, 68, 109, 103, 77, 32 24, 35, 55, 64, 81, 104, 113, 92, 33 49, 64, 78, 87, 103, 121, 120, 101, 34 72, 92, 95, 98, 112, 100, 103, 99 35}; 36 37static const uint8_t chroma_quant[64] = { 38 17, 18, 24, 47, 99, 99, 99, 99, 39 18, 21, 26, 66, 99, 99, 99, 99, 40 24, 26, 56, 99, 99, 99, 99, 99, 41 47, 66, 99, 99, 99, 99, 99, 99, 42 99, 99, 99, 99, 99, 99, 99, 99, 43 99, 99, 99, 99, 99, 99, 99, 99, 44 99, 99, 99, 99, 99, 99, 99, 99, 45 99, 99, 99, 99, 99, 99, 99, 99 46}; 47 48void ff_mss34_gen_quant_mat(uint16_t *qmat, int quality, int luma) 49{ 50 int i; 51 const uint8_t *qsrc = luma ? luma_quant : chroma_quant; 52 53 if (quality >= 50) { 54 int scale = 200 - 2 * quality; 55 56 for (i = 0; i < 64; i++) 57 qmat[i] = (qsrc[i] * scale + 50) / 100; 58 } else { 59 for (i = 0; i < 64; i++) 60 qmat[i] = (5000 * qsrc[i] / quality + 50) / 100; 61 } 62} 63 64#define DCT_TEMPLATE(blk, step, SOP, shift) \ 65 const unsigned t0 =-39409U * blk[7 * step] - 58980U * blk[1 * step]; \ 66 const unsigned t1 = 39410U * blk[1 * step] - 58980U * blk[7 * step]; \ 67 const unsigned t2 =-33410U * blk[5 * step] -167963U * blk[3 * step]; \ 68 const unsigned t3 = 33410U * blk[3 * step] -167963U * blk[5 * step]; \ 69 const unsigned t4 = blk[3 * step] + blk[7 * step]; \ 70 const unsigned t5 = blk[1 * step] + blk[5 * step]; \ 71 const unsigned t6 = 77062U * t4 + 51491U * t5; \ 72 const unsigned t7 = 77062U * t5 - 51491U * t4; \ 73 const unsigned t8 = 35470U * blk[2 * step] - 85623U * blk[6 * step]; \ 74 const unsigned t9 = 35470U * blk[6 * step] + 85623U * blk[2 * step]; \ 75 const unsigned tA = SOP(blk[0 * step] - blk[4 * step]); \ 76 const unsigned tB = SOP(blk[0 * step] + blk[4 * step]); \ 77 \ 78 blk[0 * step] = (int)( t1 + t6 + t9 + tB) >> shift; \ 79 blk[1 * step] = (int)( t3 + t7 + t8 + tA) >> shift; \ 80 blk[2 * step] = (int)( t2 + t6 - t8 + tA) >> shift; \ 81 blk[3 * step] = (int)( t0 + t7 - t9 + tB) >> shift; \ 82 blk[4 * step] = (int)(-(t0 + t7) - t9 + tB) >> shift; \ 83 blk[5 * step] = (int)(-(t2 + t6) - t8 + tA) >> shift; \ 84 blk[6 * step] = (int)(-(t3 + t7) + t8 + tA) >> shift; \ 85 blk[7 * step] = (int)(-(t1 + t6) + t9 + tB) >> shift; \ 86 87#define SOP_ROW(a) (((a) * (1U << 16)) + 0x2000) 88#define SOP_COL(a) (((a) + 32) * (1U << 16)) 89 90void ff_mss34_dct_put(uint8_t *dst, ptrdiff_t stride, int *block) 91{ 92 int i, j; 93 int *ptr; 94 95 ptr = block; 96 for (i = 0; i < 8; i++) { 97 DCT_TEMPLATE(ptr, 1, SOP_ROW, 13); 98 ptr += 8; 99 } 100 101 ptr = block; 102 for (i = 0; i < 8; i++) { 103 DCT_TEMPLATE(ptr, 8, SOP_COL, 22); 104 ptr++; 105 } 106 107 ptr = block; 108 for (j = 0; j < 8; j++) { 109 for (i = 0; i < 8; i++) 110 dst[i] = av_clip_uint8(ptr[i] + 128); 111 dst += stride; 112 ptr += 8; 113 } 114} 115