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| 4349 | Serge | 1 | /* |
| 2 | * Common stuff for some Microsoft Screen codecs |
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| 3 | * Copyright (C) 2012 Konstantin Shishkov |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include |
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| 23 | #include "libavutil/common.h" |
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| 24 | #include "mss34dsp.h" |
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| 25 | |||
| 26 | static const uint8_t luma_quant[64] = { |
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| 27 | 16, 11, 10, 16, 24, 40, 51, 61, |
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| 28 | 12, 12, 14, 19, 26, 58, 60, 55, |
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| 29 | 14, 13, 16, 24, 40, 57, 69, 56, |
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| 30 | 14, 17, 22, 29, 51, 87, 80, 62, |
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| 31 | 18, 22, 37, 56, 68, 109, 103, 77, |
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| 32 | 24, 35, 55, 64, 81, 104, 113, 92, |
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| 33 | 49, 64, 78, 87, 103, 121, 120, 101, |
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| 34 | 72, 92, 95, 98, 112, 100, 103, 99 |
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| 35 | }; |
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| 36 | |||
| 37 | static const uint8_t chroma_quant[64] = { |
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| 38 | 17, 18, 24, 47, 99, 99, 99, 99, |
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| 39 | 18, 21, 26, 66, 99, 99, 99, 99, |
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| 40 | 24, 26, 56, 99, 99, 99, 99, 99, |
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| 41 | 47, 66, 99, 99, 99, 99, 99, 99, |
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| 42 | 99, 99, 99, 99, 99, 99, 99, 99, |
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| 43 | 99, 99, 99, 99, 99, 99, 99, 99, |
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| 44 | 99, 99, 99, 99, 99, 99, 99, 99, |
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| 45 | 99, 99, 99, 99, 99, 99, 99, 99 |
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| 46 | }; |
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| 47 | |||
| 48 | void ff_mss34_gen_quant_mat(uint16_t *qmat, int quality, int luma) |
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| 49 | { |
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| 50 | int i; |
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| 51 | const uint8_t *qsrc = luma ? luma_quant : chroma_quant; |
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| 52 | |||
| 53 | if (quality >= 50) { |
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| 54 | int scale = 200 - 2 * quality; |
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| 55 | |||
| 56 | for (i = 0; i < 64; i++) |
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| 57 | qmat[i] = (qsrc[i] * scale + 50) / 100; |
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| 58 | } else { |
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| 59 | for (i = 0; i < 64; i++) |
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| 60 | qmat[i] = (5000 * qsrc[i] / quality + 50) / 100; |
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| 61 | } |
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| 62 | } |
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| 63 | |||
| 64 | #define DCT_TEMPLATE(blk, step, SOP, shift) \ |
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| 65 | const int t0 = -39409 * blk[7 * step] - 58980 * blk[1 * step]; \ |
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| 66 | const int t1 = 39410 * blk[1 * step] - 58980 * blk[7 * step]; \ |
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| 67 | const int t2 = -33410 * blk[5 * step] - 167963 * blk[3 * step]; \ |
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| 68 | const int t3 = 33410 * blk[3 * step] - 167963 * blk[5 * step]; \ |
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| 69 | const int t4 = blk[3 * step] + blk[7 * step]; \ |
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| 70 | const int t5 = blk[1 * step] + blk[5 * step]; \ |
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| 71 | const int t6 = 77062 * t4 + 51491 * t5; \ |
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| 72 | const int t7 = 77062 * t5 - 51491 * t4; \ |
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| 73 | const int t8 = 35470 * blk[2 * step] - 85623 * blk[6 * step]; \ |
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| 74 | const int t9 = 35470 * blk[6 * step] + 85623 * blk[2 * step]; \ |
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| 75 | const int tA = SOP(blk[0 * step] - blk[4 * step]); \ |
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| 76 | const int tB = SOP(blk[0 * step] + blk[4 * step]); \ |
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| 77 | \ |
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| 78 | blk[0 * step] = ( t1 + t6 + t9 + tB) >> shift; \ |
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| 79 | blk[1 * step] = ( t3 + t7 + t8 + tA) >> shift; \ |
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| 80 | blk[2 * step] = ( t2 + t6 - t8 + tA) >> shift; \ |
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| 81 | blk[3 * step] = ( t0 + t7 - t9 + tB) >> shift; \ |
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| 82 | blk[4 * step] = (-(t0 + t7) - t9 + tB) >> shift; \ |
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| 83 | blk[5 * step] = (-(t2 + t6) - t8 + tA) >> shift; \ |
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| 84 | blk[6 * step] = (-(t3 + t7) + t8 + tA) >> shift; \ |
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| 85 | blk[7 * step] = (-(t1 + t6) + t9 + tB) >> shift; \ |
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| 86 | |||
| 87 | #define SOP_ROW(a) ((a) << 16) + 0x2000 |
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| 88 | #define SOP_COL(a) ((a + 32) << 16) |
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| 89 | |||
| 90 | void ff_mss34_dct_put(uint8_t *dst, int stride, int *block) |
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| 91 | { |
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| 92 | int i, j; |
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| 93 | int *ptr; |
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| 94 | |||
| 95 | ptr = block; |
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| 96 | for (i = 0; i < 8; i++) { |
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| 97 | DCT_TEMPLATE(ptr, 1, SOP_ROW, 13); |
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| 98 | ptr += 8; |
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| 99 | } |
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| 100 | |||
| 101 | ptr = block; |
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| 102 | for (i = 0; i < 8; i++) { |
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| 103 | DCT_TEMPLATE(ptr, 8, SOP_COL, 22); |
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| 104 | ptr++; |
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| 105 | } |
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| 106 | |||
| 107 | ptr = block; |
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| 108 | for (j = 0; j < 8; j++) { |
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| 109 | for (i = 0; i < 8; i++) |
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| 110 | dst[i] = av_clip_uint8(ptr[i] + 128); |
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| 111 | dst += stride; |
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| 112 | ptr += 8; |
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| 113 | } |
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| 114 | } |