1/* 2 * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/** 22 * @file 23 * Microsoft Screen 2 (aka Windows Media Video V9 Screen) decoder DSP routines 24 */ 25 26#include "mss2dsp.h" 27#include "libavutil/common.h" 28 29static av_always_inline void mss2_blit_wmv9_template(uint8_t *dst, 30 int dst_stride, 31 int gray, 32 int use_mask, 33 int maskcolor, 34 const uint8_t *mask, 35 int mask_stride, 36 const uint8_t *srcy, 37 int srcy_stride, 38 const uint8_t *srcu, 39 const uint8_t *srcv, 40 int srcuv_stride, 41 int w, int h) 42{ 43 int i, j, k, r = -1; 44 while (++r < h) { 45 for (i = 0, j = 0, k = 0; i < w; j += (i & 1), i++, k += 3) { 46 if (!use_mask || mask[i] == maskcolor) { 47 if (gray) { 48 dst[k] = dst[k + 1] = dst[k + 2] = 0x80; 49 } else { 50 int y = srcy[i]; 51 int u = srcu[j] - 128; 52 int v = srcv[j] - 128; 53 dst[k] = av_clip_uint8(y + ( 91881 * v + 32768 >> 16)); 54 dst[k + 1] = av_clip_uint8(y + (-22554 * u - 46802 * v + 32768 >> 16)); 55 dst[k + 2] = av_clip_uint8(y + (116130 * u + 32768 >> 16)); 56 } 57 } 58 } 59 mask += mask_stride; 60 dst += dst_stride; 61 srcy += srcy_stride; 62 srcu += srcuv_stride * (r & 1); 63 srcv += srcuv_stride * (r & 1); 64 } 65} 66 67static void mss2_blit_wmv9_c(uint8_t *dst, int dst_stride, 68 const uint8_t *srcy, int srcy_stride, 69 const uint8_t *srcu, const uint8_t *srcv, 70 int srcuv_stride, int w, int h) 71{ 72 mss2_blit_wmv9_template(dst, dst_stride, 0, 0, 73 0, NULL, 0, 74 srcy, srcy_stride, 75 srcu, srcv, srcuv_stride, 76 w, h); 77} 78 79static void mss2_blit_wmv9_masked_c(uint8_t *dst, int dst_stride, 80 int maskcolor, const uint8_t *mask, 81 int mask_stride, 82 const uint8_t *srcy, int srcy_stride, 83 const uint8_t *srcu, const uint8_t *srcv, 84 int srcuv_stride, int w, int h) 85{ 86 mss2_blit_wmv9_template(dst, dst_stride, 0, 1, 87 maskcolor, mask, mask_stride, 88 srcy, srcy_stride, 89 srcu, srcv, srcuv_stride, 90 w, h); 91} 92 93static void mss2_gray_fill_masked_c(uint8_t *dst, int dst_stride, 94 int maskcolor, const uint8_t *mask, 95 int mask_stride, int w, int h) 96{ 97 mss2_blit_wmv9_template(dst, dst_stride, 1, 1, 98 maskcolor, mask, mask_stride, 99 NULL, 0, 100 NULL, NULL, 0, 101 w, h); 102} 103 104static void upsample_plane_c(uint8_t *plane, int plane_stride, int w, int h) 105{ 106 uint8_t *src1, *src2, *dst1, *dst2, *p, a, b; 107 int i, j; 108 109 if(!w || !h) 110 return; 111 112 w += (w & 1); 113 h += (h & 1); 114 115 j = h - 1; 116 117 memcpy(plane + plane_stride * j, 118 plane + plane_stride * (j >> 1), 119 w); 120 121 while ((j -= 2) > 0) { 122 dst1 = plane + plane_stride * (j + 1); 123 dst2 = plane + plane_stride * j; 124 src1 = plane + plane_stride * ((j + 1) >> 1); 125 src2 = plane + plane_stride * ( j >> 1); 126 127 for (i = (w - 1) >> 1; i >= 0; i--) { 128 a = src1[i]; 129 b = src2[i]; 130 dst1[i] = (3 * a + b + 2) >> 2; 131 dst2[i] = (a + 3 * b + 2) >> 2; 132 } 133 } 134 135 for (j = h - 1; j >= 0; j--) { 136 p = plane + plane_stride * j; 137 i = w - 1; 138 139 p[i] = p[i >> 1]; 140 141 while ((i -= 2) > 0) { 142 a = p[ i >> 1]; 143 b = p[(i + 1) >> 1]; 144 p[i] = (3 * a + b + 1) >> 2; 145 p[i + 1] = (a + 3 * b + 1) >> 2; 146 } 147 } 148} 149 150av_cold void ff_mss2dsp_init(MSS2DSPContext* dsp) 151{ 152 dsp->mss2_blit_wmv9 = mss2_blit_wmv9_c; 153 dsp->mss2_blit_wmv9_masked = mss2_blit_wmv9_masked_c; 154 dsp->mss2_gray_fill_masked = mss2_gray_fill_masked_c; 155 dsp->upsample_plane = upsample_plane_c; 156} 157