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93 lines
3.6 KiB
93 lines
3.6 KiB
/* |
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* Common stuff for some Microsoft Screen codecs |
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* Copyright (C) 2012 Konstantin Shishkov |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <stdint.h> |
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#include "libavutil/common.h" |
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#include "mss34dsp.h" |
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#include "jpegquanttables.h" |
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void ff_mss34_gen_quant_mat(uint16_t *qmat, int quality, int luma) |
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{ |
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int i; |
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const uint8_t *qsrc = luma ? ff_mjpeg_std_luminance_quant_tbl : ff_mjpeg_std_chrominance_quant_tbl; |
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if (quality >= 50) { |
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int scale = 200 - 2 * quality; |
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for (i = 0; i < 64; i++) |
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qmat[i] = (qsrc[i] * scale + 50) / 100; |
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} else { |
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for (i = 0; i < 64; i++) |
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qmat[i] = (5000 * qsrc[i] / quality + 50) / 100; |
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} |
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} |
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#define DCT_TEMPLATE(blk, step, SOP, shift) \ |
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const unsigned t0 =-39409U * blk[7 * step] - 58980U * blk[1 * step]; \ |
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const unsigned t1 = 39410U * blk[1 * step] - 58980U * blk[7 * step]; \ |
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const unsigned t2 =-33410U * blk[5 * step] -167963U * blk[3 * step]; \ |
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const unsigned t3 = 33410U * blk[3 * step] -167963U * blk[5 * step]; \ |
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const unsigned t4 = blk[3 * step] + blk[7 * step]; \ |
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const unsigned t5 = blk[1 * step] + blk[5 * step]; \ |
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const unsigned t6 = 77062U * t4 + 51491U * t5; \ |
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const unsigned t7 = 77062U * t5 - 51491U * t4; \ |
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const unsigned t8 = 35470U * blk[2 * step] - 85623U * blk[6 * step]; \ |
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const unsigned t9 = 35470U * blk[6 * step] + 85623U * blk[2 * step]; \ |
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const unsigned tA = SOP(blk[0 * step] - blk[4 * step]); \ |
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const unsigned tB = SOP(blk[0 * step] + blk[4 * step]); \ |
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\ |
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blk[0 * step] = (int)( t1 + t6 + t9 + tB) >> shift; \ |
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blk[1 * step] = (int)( t3 + t7 + t8 + tA) >> shift; \ |
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blk[2 * step] = (int)( t2 + t6 - t8 + tA) >> shift; \ |
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blk[3 * step] = (int)( t0 + t7 - t9 + tB) >> shift; \ |
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blk[4 * step] = (int)(-(t0 + t7) - t9 + tB) >> shift; \ |
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blk[5 * step] = (int)(-(t2 + t6) - t8 + tA) >> shift; \ |
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blk[6 * step] = (int)(-(t3 + t7) + t8 + tA) >> shift; \ |
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blk[7 * step] = (int)(-(t1 + t6) + t9 + tB) >> shift; \ |
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#define SOP_ROW(a) (((a) * (1U << 16)) + 0x2000) |
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#define SOP_COL(a) (((a) + 32) * (1U << 16)) |
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void ff_mss34_dct_put(uint8_t *dst, ptrdiff_t stride, int *block) |
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{ |
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int i, j; |
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int *ptr; |
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ptr = block; |
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for (i = 0; i < 8; i++) { |
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DCT_TEMPLATE(ptr, 1, SOP_ROW, 13); |
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ptr += 8; |
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} |
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ptr = block; |
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for (i = 0; i < 8; i++) { |
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DCT_TEMPLATE(ptr, 8, SOP_COL, 22); |
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ptr++; |
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} |
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ptr = block; |
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for (j = 0; j < 8; j++) { |
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for (i = 0; i < 8; i++) |
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dst[i] = av_clip_uint8(ptr[i] + 128); |
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dst += stride; |
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ptr += 8; |
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} |
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}
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