| /* |
| * 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; |
| } |
| } |