| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | #include "jpegquanttables.h" | ||
| 26 | |||
| 27 | 4 | void ff_mss34_gen_quant_mat(uint16_t *qmat, int quality, int luma) | |
| 28 | { | ||
| 29 | int i; | ||
| 30 |
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4 | const uint8_t *qsrc = luma ? ff_mjpeg_std_luminance_quant_tbl : ff_mjpeg_std_chrominance_quant_tbl; |
| 31 | |||
| 32 |
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4 | if (quality >= 50) { |
| 33 | 4 | int scale = 200 - 2 * quality; | |
| 34 | |||
| 35 |
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260 | for (i = 0; i < 64; i++) |
| 36 | 256 | qmat[i] = (qsrc[i] * scale + 50) / 100; | |
| 37 | } else { | ||
| 38 | ✗ | for (i = 0; i < 64; i++) | |
| 39 | ✗ | qmat[i] = (5000 * qsrc[i] / quality + 50) / 100; | |
| 40 | } | ||
| 41 | 4 | } | |
| 42 | |||
| 43 | #define DCT_TEMPLATE(blk, step, SOP, shift) \ | ||
| 44 | const unsigned t0 =-39409U * blk[7 * step] - 58980U * blk[1 * step]; \ | ||
| 45 | const unsigned t1 = 39410U * blk[1 * step] - 58980U * blk[7 * step]; \ | ||
| 46 | const unsigned t2 =-33410U * blk[5 * step] -167963U * blk[3 * step]; \ | ||
| 47 | const unsigned t3 = 33410U * blk[3 * step] -167963U * blk[5 * step]; \ | ||
| 48 | const unsigned t4 = blk[3 * step] + blk[7 * step]; \ | ||
| 49 | const unsigned t5 = blk[1 * step] + blk[5 * step]; \ | ||
| 50 | const unsigned t6 = 77062U * t4 + 51491U * t5; \ | ||
| 51 | const unsigned t7 = 77062U * t5 - 51491U * t4; \ | ||
| 52 | const unsigned t8 = 35470U * blk[2 * step] - 85623U * blk[6 * step]; \ | ||
| 53 | const unsigned t9 = 35470U * blk[6 * step] + 85623U * blk[2 * step]; \ | ||
| 54 | const unsigned tA = SOP(blk[0 * step] - blk[4 * step]); \ | ||
| 55 | const unsigned tB = SOP(blk[0 * step] + blk[4 * step]); \ | ||
| 56 | \ | ||
| 57 | blk[0 * step] = (int)( t1 + t6 + t9 + tB) >> shift; \ | ||
| 58 | blk[1 * step] = (int)( t3 + t7 + t8 + tA) >> shift; \ | ||
| 59 | blk[2 * step] = (int)( t2 + t6 - t8 + tA) >> shift; \ | ||
| 60 | blk[3 * step] = (int)( t0 + t7 - t9 + tB) >> shift; \ | ||
| 61 | blk[4 * step] = (int)(-(t0 + t7) - t9 + tB) >> shift; \ | ||
| 62 | blk[5 * step] = (int)(-(t2 + t6) - t8 + tA) >> shift; \ | ||
| 63 | blk[6 * step] = (int)(-(t3 + t7) + t8 + tA) >> shift; \ | ||
| 64 | blk[7 * step] = (int)(-(t1 + t6) + t9 + tB) >> shift; \ | ||
| 65 | |||
| 66 | #define SOP_ROW(a) (((a) * (1U << 16)) + 0x2000) | ||
| 67 | #define SOP_COL(a) (((a) + 32) * (1U << 16)) | ||
| 68 | |||
| 69 | 85284 | void ff_mss34_dct_put(uint8_t *dst, ptrdiff_t stride, int *block) | |
| 70 | { | ||
| 71 | int i, j; | ||
| 72 | int *ptr; | ||
| 73 | |||
| 74 | 85284 | ptr = block; | |
| 75 |
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767556 | for (i = 0; i < 8; i++) { |
| 76 | 682272 | DCT_TEMPLATE(ptr, 1, SOP_ROW, 13); | |
| 77 | 682272 | ptr += 8; | |
| 78 | } | ||
| 79 | |||
| 80 | 85284 | ptr = block; | |
| 81 |
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767556 | for (i = 0; i < 8; i++) { |
| 82 | 682272 | DCT_TEMPLATE(ptr, 8, SOP_COL, 22); | |
| 83 | 682272 | ptr++; | |
| 84 | } | ||
| 85 | |||
| 86 | 85284 | ptr = block; | |
| 87 |
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767556 | for (j = 0; j < 8; j++) { |
| 88 |
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6140448 | for (i = 0; i < 8; i++) |
| 89 | 5458176 | dst[i] = av_clip_uint8(ptr[i] + 128); | |
| 90 | 682272 | dst += stride; | |
| 91 | 682272 | ptr += 8; | |
| 92 | } | ||
| 93 | 85284 | } | |
| 94 |