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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 | } |