| 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 | |
| 29 | static 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 | |
| 67 | static 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 | |
| 79 | static 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 | |
| 93 | static 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 | |
| 104 | static 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 | |
| 150 | av_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 | } |