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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 | ||
26 | static 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 | ||
37 | static 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 | ||
48 | void 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 int t0 = -39409 * blk[7 * step] - 58980 * blk[1 * step]; \ | |
66 | const int t1 = 39410 * blk[1 * step] - 58980 * blk[7 * step]; \ | |
67 | const int t2 = -33410 * blk[5 * step] - 167963 * blk[3 * step]; \ | |
68 | const int t3 = 33410 * blk[3 * step] - 167963 * blk[5 * step]; \ | |
69 | const int t4 = blk[3 * step] + blk[7 * step]; \ | |
70 | const int t5 = blk[1 * step] + blk[5 * step]; \ | |
71 | const int t6 = 77062 * t4 + 51491 * t5; \ | |
72 | const int t7 = 77062 * t5 - 51491 * t4; \ | |
73 | const int t8 = 35470 * blk[2 * step] - 85623 * blk[6 * step]; \ | |
74 | const int t9 = 35470 * blk[6 * step] + 85623 * blk[2 * step]; \ | |
75 | const int tA = SOP(blk[0 * step] - blk[4 * step]); \ | |
76 | const int tB = SOP(blk[0 * step] + blk[4 * step]); \ | |
77 | \ | |
78 | blk[0 * step] = ( t1 + t6 + t9 + tB) >> shift; \ | |
79 | blk[1 * step] = ( t3 + t7 + t8 + tA) >> shift; \ | |
80 | blk[2 * step] = ( t2 + t6 - t8 + tA) >> shift; \ | |
81 | blk[3 * step] = ( t0 + t7 - t9 + tB) >> shift; \ | |
82 | blk[4 * step] = (-(t0 + t7) - t9 + tB) >> shift; \ | |
83 | blk[5 * step] = (-(t2 + t6) - t8 + tA) >> shift; \ | |
84 | blk[6 * step] = (-(t3 + t7) + t8 + tA) >> shift; \ | |
85 | blk[7 * step] = (-(t1 + t6) + t9 + tB) >> shift; \ | |
86 | ||
87 | #define SOP_ROW(a) (((a) << 16) + 0x2000) | |
88 | #define SOP_COL(a) (((a) + 32) << 16) | |
89 | ||
90 | void ff_mss34_dct_put(uint8_t *dst, int 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 | } |