blob: cc39dd637f2c62618c16502e8eca2849fb48eb83
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 | ptrdiff_t dst_stride, |
31 | int gray, |
32 | int use_mask, |
33 | int maskcolor, |
34 | const uint8_t *mask, |
35 | ptrdiff_t mask_stride, |
36 | const uint8_t *srcy, |
37 | ptrdiff_t srcy_stride, |
38 | const uint8_t *srcu, |
39 | const uint8_t *srcv, |
40 | ptrdiff_t 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, ptrdiff_t dst_stride, |
68 | const uint8_t *srcy, ptrdiff_t srcy_stride, |
69 | const uint8_t *srcu, const uint8_t *srcv, |
70 | ptrdiff_t 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, ptrdiff_t dst_stride, |
80 | int maskcolor, const uint8_t *mask, |
81 | ptrdiff_t mask_stride, |
82 | const uint8_t *srcy, ptrdiff_t srcy_stride, |
83 | const uint8_t *srcu, const uint8_t *srcv, |
84 | ptrdiff_t 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, ptrdiff_t dst_stride, |
94 | int maskcolor, const uint8_t *mask, |
95 | ptrdiff_t 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, ptrdiff_t 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 | } |
157 |