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115 lines
4.1 KiB
C
115 lines
4.1 KiB
C
/*
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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static const uint8_t luma_quant[64] = {
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16, 11, 10, 16, 24, 40, 51, 61,
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12, 12, 14, 19, 26, 58, 60, 55,
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14, 13, 16, 24, 40, 57, 69, 56,
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14, 17, 22, 29, 51, 87, 80, 62,
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18, 22, 37, 56, 68, 109, 103, 77,
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24, 35, 55, 64, 81, 104, 113, 92,
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49, 64, 78, 87, 103, 121, 120, 101,
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72, 92, 95, 98, 112, 100, 103, 99
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};
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static const uint8_t chroma_quant[64] = {
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17, 18, 24, 47, 99, 99, 99, 99,
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18, 21, 26, 66, 99, 99, 99, 99,
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24, 26, 56, 99, 99, 99, 99, 99,
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47, 66, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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};
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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 ? luma_quant : chroma_quant;
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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 int t0 = -39409 * blk[7 * step] - 58980 * blk[1 * step]; \
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const int t1 = 39410 * blk[1 * step] - 58980 * blk[7 * step]; \
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const int t2 = -33410 * blk[5 * step] - 167963 * blk[3 * step]; \
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const int t3 = 33410 * blk[3 * step] - 167963 * blk[5 * step]; \
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const int t4 = blk[3 * step] + blk[7 * step]; \
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const int t5 = blk[1 * step] + blk[5 * step]; \
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const int t6 = 77062 * t4 + 51491 * t5; \
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const int t7 = 77062 * t5 - 51491 * t4; \
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const int t8 = 35470 * blk[2 * step] - 85623 * blk[6 * step]; \
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const int t9 = 35470 * blk[6 * step] + 85623 * blk[2 * step]; \
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const int tA = SOP(blk[0 * step] - blk[4 * step]); \
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const int tB = SOP(blk[0 * step] + blk[4 * step]); \
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\
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blk[0 * step] = ( t1 + t6 + t9 + tB) >> shift; \
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blk[1 * step] = ( t3 + t7 + t8 + tA) >> shift; \
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blk[2 * step] = ( t2 + t6 - t8 + tA) >> shift; \
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blk[3 * step] = ( t0 + t7 - t9 + tB) >> shift; \
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blk[4 * step] = (-(t0 + t7) - t9 + tB) >> shift; \
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blk[5 * step] = (-(t2 + t6) - t8 + tA) >> shift; \
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blk[6 * step] = (-(t3 + t7) + t8 + tA) >> shift; \
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blk[7 * step] = (-(t1 + t6) + t9 + tB) >> shift; \
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#define SOP_ROW(a) ((a) << 16) + 0x2000
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#define SOP_COL(a) ((a + 32) << 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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