From acfb6b6cf80a4984dfc992100d6112027644e176 Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Mon, 9 Jul 2012 07:55:12 +0200 Subject: mss3: split DSP functions that are used in MTS2(MSS4) into separate file --- libavcodec/mss34dsp.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100644 libavcodec/mss34dsp.c (limited to 'libavcodec/mss34dsp.c') diff --git a/libavcodec/mss34dsp.c b/libavcodec/mss34dsp.c new file mode 100644 index 0000000000..11abb2de11 --- /dev/null +++ b/libavcodec/mss34dsp.c @@ -0,0 +1,114 @@ +/* + * Common stuff for some Microsoft Screen codecs + * Copyright (C) 2012 Konstantin Shishkov + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#include "libavutil/common.h" +#include "mss34dsp.h" + +static const uint8_t luma_quant[64] = { + 16, 11, 10, 16, 24, 40, 51, 61, + 12, 12, 14, 19, 26, 58, 60, 55, + 14, 13, 16, 24, 40, 57, 69, 56, + 14, 17, 22, 29, 51, 87, 80, 62, + 18, 22, 37, 56, 68, 109, 103, 77, + 24, 35, 55, 64, 81, 104, 113, 92, + 49, 64, 78, 87, 103, 121, 120, 101, + 72, 92, 95, 98, 112, 100, 103, 99 +}; + +static const uint8_t chroma_quant[64] = { + 17, 18, 24, 47, 99, 99, 99, 99, + 18, 21, 26, 66, 99, 99, 99, 99, + 24, 26, 56, 99, 99, 99, 99, 99, + 47, 66, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99, + 99, 99, 99, 99, 99, 99, 99, 99 +}; + +void ff_mss34_gen_quant_mat(uint16_t *qmat, int quality, int luma) +{ + int i; + const uint8_t *qsrc = luma ? luma_quant : chroma_quant; + + 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 int t0 = -39409 * blk[7 * step] - 58980 * blk[1 * step]; \ + const int t1 = 39410 * blk[1 * step] - 58980 * blk[7 * step]; \ + const int t2 = -33410 * blk[5 * step] - 167963 * blk[3 * step]; \ + const int t3 = 33410 * blk[3 * step] - 167963 * blk[5 * step]; \ + const int t4 = blk[3 * step] + blk[7 * step]; \ + const int t5 = blk[1 * step] + blk[5 * step]; \ + const int t6 = 77062 * t4 + 51491 * t5; \ + const int t7 = 77062 * t5 - 51491 * t4; \ + const int t8 = 35470 * blk[2 * step] - 85623 * blk[6 * step]; \ + const int t9 = 35470 * blk[6 * step] + 85623 * blk[2 * step]; \ + const int tA = SOP(blk[0 * step] - blk[4 * step]); \ + const int tB = SOP(blk[0 * step] + blk[4 * step]); \ + \ + blk[0 * step] = ( t1 + t6 + t9 + tB) >> shift; \ + blk[1 * step] = ( t3 + t7 + t8 + tA) >> shift; \ + blk[2 * step] = ( t2 + t6 - t8 + tA) >> shift; \ + blk[3 * step] = ( t0 + t7 - t9 + tB) >> shift; \ + blk[4 * step] = (-(t0 + t7) - t9 + tB) >> shift; \ + blk[5 * step] = (-(t2 + t6) - t8 + tA) >> shift; \ + blk[6 * step] = (-(t3 + t7) + t8 + tA) >> shift; \ + blk[7 * step] = (-(t1 + t6) + t9 + tB) >> shift; \ + +#define SOP_ROW(a) ((a) << 16) + 0x2000 +#define SOP_COL(a) ((a + 32) << 16) + +void ff_mss34_dct_put(uint8_t *dst, int 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; + } +} -- cgit v1.2.3