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path: root/libavcodec/sanm.c (plain)
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1/*
2 * LucasArts Smush video decoder
3 * Copyright (c) 2006 Cyril Zorin
4 * Copyright (c) 2011 Konstantin Shishkov
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include "libavutil/avassert.h"
24#include "libavutil/bswap.h"
25#include "libavutil/imgutils.h"
26
27#include "avcodec.h"
28#include "bytestream.h"
29#include "copy_block.h"
30#include "internal.h"
31
32#define NGLYPHS 256
33#define GLYPH_COORD_VECT_SIZE 16
34#define PALETTE_SIZE 256
35#define PALETTE_DELTA 768
36
37static const int8_t glyph4_x[GLYPH_COORD_VECT_SIZE] = {
38 0, 1, 2, 3, 3, 3, 3, 2, 1, 0, 0, 0, 1, 2, 2, 1
39};
40
41static const int8_t glyph4_y[GLYPH_COORD_VECT_SIZE] = {
42 0, 0, 0, 0, 1, 2, 3, 3, 3, 3, 2, 1, 1, 1, 2, 2
43};
44
45static const int8_t glyph8_x[GLYPH_COORD_VECT_SIZE] = {
46 0, 2, 5, 7, 7, 7, 7, 7, 7, 5, 2, 0, 0, 0, 0, 0
47};
48
49static const int8_t glyph8_y[GLYPH_COORD_VECT_SIZE] = {
50 0, 0, 0, 0, 1, 3, 4, 6, 7, 7, 7, 7, 6, 4, 3, 1
51};
52
53static const int8_t motion_vectors[256][2] = {
54 { 0, 0 }, { -1, -43 }, { 6, -43 }, { -9, -42 }, { 13, -41 },
55 { -16, -40 }, { 19, -39 }, { -23, -36 }, { 26, -34 }, { -2, -33 },
56 { 4, -33 }, { -29, -32 }, { -9, -32 }, { 11, -31 }, { -16, -29 },
57 { 32, -29 }, { 18, -28 }, { -34, -26 }, { -22, -25 }, { -1, -25 },
58 { 3, -25 }, { -7, -24 }, { 8, -24 }, { 24, -23 }, { 36, -23 },
59 { -12, -22 }, { 13, -21 }, { -38, -20 }, { 0, -20 }, { -27, -19 },
60 { -4, -19 }, { 4, -19 }, { -17, -18 }, { -8, -17 }, { 8, -17 },
61 { 18, -17 }, { 28, -17 }, { 39, -17 }, { -12, -15 }, { 12, -15 },
62 { -21, -14 }, { -1, -14 }, { 1, -14 }, { -41, -13 }, { -5, -13 },
63 { 5, -13 }, { 21, -13 }, { -31, -12 }, { -15, -11 }, { -8, -11 },
64 { 8, -11 }, { 15, -11 }, { -2, -10 }, { 1, -10 }, { 31, -10 },
65 { -23, -9 }, { -11, -9 }, { -5, -9 }, { 4, -9 }, { 11, -9 },
66 { 42, -9 }, { 6, -8 }, { 24, -8 }, { -18, -7 }, { -7, -7 },
67 { -3, -7 }, { -1, -7 }, { 2, -7 }, { 18, -7 }, { -43, -6 },
68 { -13, -6 }, { -4, -6 }, { 4, -6 }, { 8, -6 }, { -33, -5 },
69 { -9, -5 }, { -2, -5 }, { 0, -5 }, { 2, -5 }, { 5, -5 },
70 { 13, -5 }, { -25, -4 }, { -6, -4 }, { -3, -4 }, { 3, -4 },
71 { 9, -4 }, { -19, -3 }, { -7, -3 }, { -4, -3 }, { -2, -3 },
72 { -1, -3 }, { 0, -3 }, { 1, -3 }, { 2, -3 }, { 4, -3 },
73 { 6, -3 }, { 33, -3 }, { -14, -2 }, { -10, -2 }, { -5, -2 },
74 { -3, -2 }, { -2, -2 }, { -1, -2 }, { 0, -2 }, { 1, -2 },
75 { 2, -2 }, { 3, -2 }, { 5, -2 }, { 7, -2 }, { 14, -2 },
76 { 19, -2 }, { 25, -2 }, { 43, -2 }, { -7, -1 }, { -3, -1 },
77 { -2, -1 }, { -1, -1 }, { 0, -1 }, { 1, -1 }, { 2, -1 },
78 { 3, -1 }, { 10, -1 }, { -5, 0 }, { -3, 0 }, { -2, 0 },
79 { -1, 0 }, { 1, 0 }, { 2, 0 }, { 3, 0 }, { 5, 0 },
80 { 7, 0 }, { -10, 1 }, { -7, 1 }, { -3, 1 }, { -2, 1 },
81 { -1, 1 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 3, 1 },
82 { -43, 2 }, { -25, 2 }, { -19, 2 }, { -14, 2 }, { -5, 2 },
83 { -3, 2 }, { -2, 2 }, { -1, 2 }, { 0, 2 }, { 1, 2 },
84 { 2, 2 }, { 3, 2 }, { 5, 2 }, { 7, 2 }, { 10, 2 },
85 { 14, 2 }, { -33, 3 }, { -6, 3 }, { -4, 3 }, { -2, 3 },
86 { -1, 3 }, { 0, 3 }, { 1, 3 }, { 2, 3 }, { 4, 3 },
87 { 19, 3 }, { -9, 4 }, { -3, 4 }, { 3, 4 }, { 7, 4 },
88 { 25, 4 }, { -13, 5 }, { -5, 5 }, { -2, 5 }, { 0, 5 },
89 { 2, 5 }, { 5, 5 }, { 9, 5 }, { 33, 5 }, { -8, 6 },
90 { -4, 6 }, { 4, 6 }, { 13, 6 }, { 43, 6 }, { -18, 7 },
91 { -2, 7 }, { 0, 7 }, { 2, 7 }, { 7, 7 }, { 18, 7 },
92 { -24, 8 }, { -6, 8 }, { -42, 9 }, { -11, 9 }, { -4, 9 },
93 { 5, 9 }, { 11, 9 }, { 23, 9 }, { -31, 10 }, { -1, 10 },
94 { 2, 10 }, { -15, 11 }, { -8, 11 }, { 8, 11 }, { 15, 11 },
95 { 31, 12 }, { -21, 13 }, { -5, 13 }, { 5, 13 }, { 41, 13 },
96 { -1, 14 }, { 1, 14 }, { 21, 14 }, { -12, 15 }, { 12, 15 },
97 { -39, 17 }, { -28, 17 }, { -18, 17 }, { -8, 17 }, { 8, 17 },
98 { 17, 18 }, { -4, 19 }, { 0, 19 }, { 4, 19 }, { 27, 19 },
99 { 38, 20 }, { -13, 21 }, { 12, 22 }, { -36, 23 }, { -24, 23 },
100 { -8, 24 }, { 7, 24 }, { -3, 25 }, { 1, 25 }, { 22, 25 },
101 { 34, 26 }, { -18, 28 }, { -32, 29 }, { 16, 29 }, { -11, 31 },
102 { 9, 32 }, { 29, 32 }, { -4, 33 }, { 2, 33 }, { -26, 34 },
103 { 23, 36 }, { -19, 39 }, { 16, 40 }, { -13, 41 }, { 9, 42 },
104 { -6, 43 }, { 1, 43 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
105};
106
107static const int8_t c37_mv[] = {
108 0, 0, 1, 0, 2, 0, 3, 0, 5, 0,
109 8, 0, 13, 0, 21, 0, -1, 0, -2, 0,
110 -3, 0, -5, 0, -8, 0, -13, 0, -17, 0,
111 -21, 0, 0, 1, 1, 1, 2, 1, 3, 1,
112 5, 1, 8, 1, 13, 1, 21, 1, -1, 1,
113 -2, 1, -3, 1, -5, 1, -8, 1, -13, 1,
114 -17, 1, -21, 1, 0, 2, 1, 2, 2, 2,
115 3, 2, 5, 2, 8, 2, 13, 2, 21, 2,
116 -1, 2, -2, 2, -3, 2, -5, 2, -8, 2,
117 -13, 2, -17, 2, -21, 2, 0, 3, 1, 3,
118 2, 3, 3, 3, 5, 3, 8, 3, 13, 3,
119 21, 3, -1, 3, -2, 3, -3, 3, -5, 3,
120 -8, 3, -13, 3, -17, 3, -21, 3, 0, 5,
121 1, 5, 2, 5, 3, 5, 5, 5, 8, 5,
122 13, 5, 21, 5, -1, 5, -2, 5, -3, 5,
123 -5, 5, -8, 5, -13, 5, -17, 5, -21, 5,
124 0, 8, 1, 8, 2, 8, 3, 8, 5, 8,
125 8, 8, 13, 8, 21, 8, -1, 8, -2, 8,
126 -3, 8, -5, 8, -8, 8, -13, 8, -17, 8,
127 -21, 8, 0, 13, 1, 13, 2, 13, 3, 13,
128 5, 13, 8, 13, 13, 13, 21, 13, -1, 13,
129 -2, 13, -3, 13, -5, 13, -8, 13, -13, 13,
130 -17, 13, -21, 13, 0, 21, 1, 21, 2, 21,
131 3, 21, 5, 21, 8, 21, 13, 21, 21, 21,
132 -1, 21, -2, 21, -3, 21, -5, 21, -8, 21,
133 -13, 21, -17, 21, -21, 21, 0, -1, 1, -1,
134 2, -1, 3, -1, 5, -1, 8, -1, 13, -1,
135 21, -1, -1, -1, -2, -1, -3, -1, -5, -1,
136 -8, -1, -13, -1, -17, -1, -21, -1, 0, -2,
137 1, -2, 2, -2, 3, -2, 5, -2, 8, -2,
138 13, -2, 21, -2, -1, -2, -2, -2, -3, -2,
139 -5, -2, -8, -2, -13, -2, -17, -2, -21, -2,
140 0, -3, 1, -3, 2, -3, 3, -3, 5, -3,
141 8, -3, 13, -3, 21, -3, -1, -3, -2, -3,
142 -3, -3, -5, -3, -8, -3, -13, -3, -17, -3,
143 -21, -3, 0, -5, 1, -5, 2, -5, 3, -5,
144 5, -5, 8, -5, 13, -5, 21, -5, -1, -5,
145 -2, -5, -3, -5, -5, -5, -8, -5, -13, -5,
146 -17, -5, -21, -5, 0, -8, 1, -8, 2, -8,
147 3, -8, 5, -8, 8, -8, 13, -8, 21, -8,
148 -1, -8, -2, -8, -3, -8, -5, -8, -8, -8,
149 -13, -8, -17, -8, -21, -8, 0, -13, 1, -13,
150 2, -13, 3, -13, 5, -13, 8, -13, 13, -13,
151 21, -13, -1, -13, -2, -13, -3, -13, -5, -13,
152 -8, -13, -13, -13, -17, -13, -21, -13, 0, -17,
153 1, -17, 2, -17, 3, -17, 5, -17, 8, -17,
154 13, -17, 21, -17, -1, -17, -2, -17, -3, -17,
155 -5, -17, -8, -17, -13, -17, -17, -17, -21, -17,
156 0, -21, 1, -21, 2, -21, 3, -21, 5, -21,
157 8, -21, 13, -21, 21, -21, -1, -21, -2, -21,
158 -3, -21, -5, -21, -8, -21, -13, -21, -17, -21,
159 0, 0, -8, -29, 8, -29, -18, -25, 17, -25,
160 0, -23, -6, -22, 6, -22, -13, -19, 12, -19,
161 0, -18, 25, -18, -25, -17, -5, -17, 5, -17,
162 -10, -15, 10, -15, 0, -14, -4, -13, 4, -13,
163 19, -13, -19, -12, -8, -11, -2, -11, 0, -11,
164 2, -11, 8, -11, -15, -10, -4, -10, 4, -10,
165 15, -10, -6, -9, -1, -9, 1, -9, 6, -9,
166 -29, -8, -11, -8, -8, -8, -3, -8, 3, -8,
167 8, -8, 11, -8, 29, -8, -5, -7, -2, -7,
168 0, -7, 2, -7, 5, -7, -22, -6, -9, -6,
169 -6, -6, -3, -6, -1, -6, 1, -6, 3, -6,
170 6, -6, 9, -6, 22, -6, -17, -5, -7, -5,
171 -4, -5, -2, -5, 0, -5, 2, -5, 4, -5,
172 7, -5, 17, -5, -13, -4, -10, -4, -5, -4,
173 -3, -4, -1, -4, 0, -4, 1, -4, 3, -4,
174 5, -4, 10, -4, 13, -4, -8, -3, -6, -3,
175 -4, -3, -3, -3, -2, -3, -1, -3, 0, -3,
176 1, -3, 2, -3, 4, -3, 6, -3, 8, -3,
177 -11, -2, -7, -2, -5, -2, -3, -2, -2, -2,
178 -1, -2, 0, -2, 1, -2, 2, -2, 3, -2,
179 5, -2, 7, -2, 11, -2, -9, -1, -6, -1,
180 -4, -1, -3, -1, -2, -1, -1, -1, 0, -1,
181 1, -1, 2, -1, 3, -1, 4, -1, 6, -1,
182 9, -1, -31, 0, -23, 0, -18, 0, -14, 0,
183 -11, 0, -7, 0, -5, 0, -4, 0, -3, 0,
184 -2, 0, -1, 0, 0, -31, 1, 0, 2, 0,
185 3, 0, 4, 0, 5, 0, 7, 0, 11, 0,
186 14, 0, 18, 0, 23, 0, 31, 0, -9, 1,
187 -6, 1, -4, 1, -3, 1, -2, 1, -1, 1,
188 0, 1, 1, 1, 2, 1, 3, 1, 4, 1,
189 6, 1, 9, 1, -11, 2, -7, 2, -5, 2,
190 -3, 2, -2, 2, -1, 2, 0, 2, 1, 2,
191 2, 2, 3, 2, 5, 2, 7, 2, 11, 2,
192 -8, 3, -6, 3, -4, 3, -2, 3, -1, 3,
193 0, 3, 1, 3, 2, 3, 3, 3, 4, 3,
194 6, 3, 8, 3, -13, 4, -10, 4, -5, 4,
195 -3, 4, -1, 4, 0, 4, 1, 4, 3, 4,
196 5, 4, 10, 4, 13, 4, -17, 5, -7, 5,
197 -4, 5, -2, 5, 0, 5, 2, 5, 4, 5,
198 7, 5, 17, 5, -22, 6, -9, 6, -6, 6,
199 -3, 6, -1, 6, 1, 6, 3, 6, 6, 6,
200 9, 6, 22, 6, -5, 7, -2, 7, 0, 7,
201 2, 7, 5, 7, -29, 8, -11, 8, -8, 8,
202 -3, 8, 3, 8, 8, 8, 11, 8, 29, 8,
203 -6, 9, -1, 9, 1, 9, 6, 9, -15, 10,
204 -4, 10, 4, 10, 15, 10, -8, 11, -2, 11,
205 0, 11, 2, 11, 8, 11, 19, 12, -19, 13,
206 -4, 13, 4, 13, 0, 14, -10, 15, 10, 15,
207 -5, 17, 5, 17, 25, 17, -25, 18, 0, 18,
208 -12, 19, 13, 19, -6, 22, 6, 22, 0, 23,
209 -17, 25, 18, 25, -8, 29, 8, 29, 0, 31,
210 0, 0, -6, -22, 6, -22, -13, -19, 12, -19,
211 0, -18, -5, -17, 5, -17, -10, -15, 10, -15,
212 0, -14, -4, -13, 4, -13, 19, -13, -19, -12,
213 -8, -11, -2, -11, 0, -11, 2, -11, 8, -11,
214 -15, -10, -4, -10, 4, -10, 15, -10, -6, -9,
215 -1, -9, 1, -9, 6, -9, -11, -8, -8, -8,
216 -3, -8, 0, -8, 3, -8, 8, -8, 11, -8,
217 -5, -7, -2, -7, 0, -7, 2, -7, 5, -7,
218 -22, -6, -9, -6, -6, -6, -3, -6, -1, -6,
219 1, -6, 3, -6, 6, -6, 9, -6, 22, -6,
220 -17, -5, -7, -5, -4, -5, -2, -5, -1, -5,
221 0, -5, 1, -5, 2, -5, 4, -5, 7, -5,
222 17, -5, -13, -4, -10, -4, -5, -4, -3, -4,
223 -2, -4, -1, -4, 0, -4, 1, -4, 2, -4,
224 3, -4, 5, -4, 10, -4, 13, -4, -8, -3,
225 -6, -3, -4, -3, -3, -3, -2, -3, -1, -3,
226 0, -3, 1, -3, 2, -3, 3, -3, 4, -3,
227 6, -3, 8, -3, -11, -2, -7, -2, -5, -2,
228 -4, -2, -3, -2, -2, -2, -1, -2, 0, -2,
229 1, -2, 2, -2, 3, -2, 4, -2, 5, -2,
230 7, -2, 11, -2, -9, -1, -6, -1, -5, -1,
231 -4, -1, -3, -1, -2, -1, -1, -1, 0, -1,
232 1, -1, 2, -1, 3, -1, 4, -1, 5, -1,
233 6, -1, 9, -1, -23, 0, -18, 0, -14, 0,
234 -11, 0, -7, 0, -5, 0, -4, 0, -3, 0,
235 -2, 0, -1, 0, 0, -23, 1, 0, 2, 0,
236 3, 0, 4, 0, 5, 0, 7, 0, 11, 0,
237 14, 0, 18, 0, 23, 0, -9, 1, -6, 1,
238 -5, 1, -4, 1, -3, 1, -2, 1, -1, 1,
239 0, 1, 1, 1, 2, 1, 3, 1, 4, 1,
240 5, 1, 6, 1, 9, 1, -11, 2, -7, 2,
241 -5, 2, -4, 2, -3, 2, -2, 2, -1, 2,
242 0, 2, 1, 2, 2, 2, 3, 2, 4, 2,
243 5, 2, 7, 2, 11, 2, -8, 3, -6, 3,
244 -4, 3, -3, 3, -2, 3, -1, 3, 0, 3,
245 1, 3, 2, 3, 3, 3, 4, 3, 6, 3,
246 8, 3, -13, 4, -10, 4, -5, 4, -3, 4,
247 -2, 4, -1, 4, 0, 4, 1, 4, 2, 4,
248 3, 4, 5, 4, 10, 4, 13, 4, -17, 5,
249 -7, 5, -4, 5, -2, 5, -1, 5, 0, 5,
250 1, 5, 2, 5, 4, 5, 7, 5, 17, 5,
251 -22, 6, -9, 6, -6, 6, -3, 6, -1, 6,
252 1, 6, 3, 6, 6, 6, 9, 6, 22, 6,
253 -5, 7, -2, 7, 0, 7, 2, 7, 5, 7,
254 -11, 8, -8, 8, -3, 8, 0, 8, 3, 8,
255 8, 8, 11, 8, -6, 9, -1, 9, 1, 9,
256 6, 9, -15, 10, -4, 10, 4, 10, 15, 10,
257 -8, 11, -2, 11, 0, 11, 2, 11, 8, 11,
258 19, 12, -19, 13, -4, 13, 4, 13, 0, 14,
259 -10, 15, 10, 15, -5, 17, 5, 17, 0, 18,
260 -12, 19, 13, 19, -6, 22, 6, 22, 0, 23,
261};
262
263typedef struct SANMVideoContext {
264 AVCodecContext *avctx;
265 GetByteContext gb;
266
267 int version, subversion;
268 uint32_t pal[PALETTE_SIZE];
269 int16_t delta_pal[PALETTE_DELTA];
270
271 ptrdiff_t pitch;
272 int width, height;
273 int aligned_width, aligned_height;
274 int prev_seq;
275
276 AVFrame *frame;
277 uint16_t *frm0, *frm1, *frm2;
278 uint8_t *stored_frame;
279 uint32_t frm0_size, frm1_size, frm2_size;
280 uint32_t stored_frame_size;
281
282 uint8_t *rle_buf;
283 unsigned int rle_buf_size;
284
285 int rotate_code;
286
287 long npixels, buf_size;
288
289 uint16_t codebook[256];
290 uint16_t small_codebook[4];
291
292 int8_t p4x4glyphs[NGLYPHS][16];
293 int8_t p8x8glyphs[NGLYPHS][64];
294} SANMVideoContext;
295
296typedef struct SANMFrameHeader {
297 int seq_num, codec, rotate_code, rle_output_size;
298
299 uint16_t bg_color;
300 uint32_t width, height;
301} SANMFrameHeader;
302
303enum GlyphEdge {
304 LEFT_EDGE,
305 TOP_EDGE,
306 RIGHT_EDGE,
307 BOTTOM_EDGE,
308 NO_EDGE
309};
310
311enum GlyphDir {
312 DIR_LEFT,
313 DIR_UP,
314 DIR_RIGHT,
315 DIR_DOWN,
316 NO_DIR
317};
318
319/**
320 * Return enum GlyphEdge of box where point (x, y) lies.
321 *
322 * @param x x point coordinate
323 * @param y y point coordinate
324 * @param edge_size box width/height.
325 */
326static enum GlyphEdge which_edge(int x, int y, int edge_size)
327{
328 const int edge_max = edge_size - 1;
329
330 if (!y)
331 return BOTTOM_EDGE;
332 else if (y == edge_max)
333 return TOP_EDGE;
334 else if (!x)
335 return LEFT_EDGE;
336 else if (x == edge_max)
337 return RIGHT_EDGE;
338 else
339 return NO_EDGE;
340}
341
342static enum GlyphDir which_direction(enum GlyphEdge edge0, enum GlyphEdge edge1)
343{
344 if ((edge0 == LEFT_EDGE && edge1 == RIGHT_EDGE) ||
345 (edge1 == LEFT_EDGE && edge0 == RIGHT_EDGE) ||
346 (edge0 == BOTTOM_EDGE && edge1 != TOP_EDGE) ||
347 (edge1 == BOTTOM_EDGE && edge0 != TOP_EDGE))
348 return DIR_UP;
349 else if ((edge0 == TOP_EDGE && edge1 != BOTTOM_EDGE) ||
350 (edge1 == TOP_EDGE && edge0 != BOTTOM_EDGE))
351 return DIR_DOWN;
352 else if ((edge0 == LEFT_EDGE && edge1 != RIGHT_EDGE) ||
353 (edge1 == LEFT_EDGE && edge0 != RIGHT_EDGE))
354 return DIR_LEFT;
355 else if ((edge0 == TOP_EDGE && edge1 == BOTTOM_EDGE) ||
356 (edge1 == TOP_EDGE && edge0 == BOTTOM_EDGE) ||
357 (edge0 == RIGHT_EDGE && edge1 != LEFT_EDGE) ||
358 (edge1 == RIGHT_EDGE && edge0 != LEFT_EDGE))
359 return DIR_RIGHT;
360
361 return NO_DIR;
362}
363
364/* Interpolate two points. */
365static void interp_point(int8_t *points, int x0, int y0, int x1, int y1,
366 int pos, int npoints)
367{
368 if (npoints) {
369 points[0] = (x0 * pos + x1 * (npoints - pos) + (npoints >> 1)) / npoints;
370 points[1] = (y0 * pos + y1 * (npoints - pos) + (npoints >> 1)) / npoints;
371 } else {
372 points[0] = x0;
373 points[1] = y0;
374 }
375}
376
377/**
378 * Construct glyphs by iterating through vector coordinates.
379 *
380 * @param pglyphs pointer to table where glyphs are stored
381 * @param xvec pointer to x component of vector coordinates
382 * @param yvec pointer to y component of vector coordinates
383 * @param side_length glyph width/height.
384 */
385static void make_glyphs(int8_t *pglyphs, const int8_t *xvec, const int8_t *yvec,
386 const int side_length)
387{
388 const int glyph_size = side_length * side_length;
389 int8_t *pglyph = pglyphs;
390
391 int i, j;
392 for (i = 0; i < GLYPH_COORD_VECT_SIZE; i++) {
393 int x0 = xvec[i];
394 int y0 = yvec[i];
395 enum GlyphEdge edge0 = which_edge(x0, y0, side_length);
396
397 for (j = 0; j < GLYPH_COORD_VECT_SIZE; j++, pglyph += glyph_size) {
398 int x1 = xvec[j];
399 int y1 = yvec[j];
400 enum GlyphEdge edge1 = which_edge(x1, y1, side_length);
401 enum GlyphDir dir = which_direction(edge0, edge1);
402 int npoints = FFMAX(FFABS(x1 - x0), FFABS(y1 - y0));
403 int ipoint;
404
405 for (ipoint = 0; ipoint <= npoints; ipoint++) {
406 int8_t point[2];
407 int irow, icol;
408
409 interp_point(point, x0, y0, x1, y1, ipoint, npoints);
410
411 switch (dir) {
412 case DIR_UP:
413 for (irow = point[1]; irow >= 0; irow--)
414 pglyph[point[0] + irow * side_length] = 1;
415 break;
416
417 case DIR_DOWN:
418 for (irow = point[1]; irow < side_length; irow++)
419 pglyph[point[0] + irow * side_length] = 1;
420 break;
421
422 case DIR_LEFT:
423 for (icol = point[0]; icol >= 0; icol--)
424 pglyph[icol + point[1] * side_length] = 1;
425 break;
426
427 case DIR_RIGHT:
428 for (icol = point[0]; icol < side_length; icol++)
429 pglyph[icol + point[1] * side_length] = 1;
430 break;
431 }
432 }
433 }
434 }
435}
436
437static void init_sizes(SANMVideoContext *ctx, int width, int height)
438{
439 ctx->width = width;
440 ctx->height = height;
441 ctx->npixels = width * height;
442
443 ctx->aligned_width = FFALIGN(width, 8);
444 ctx->aligned_height = FFALIGN(height, 8);
445
446 ctx->buf_size = ctx->aligned_width * ctx->aligned_height * sizeof(ctx->frm0[0]);
447 ctx->pitch = width;
448}
449
450static void destroy_buffers(SANMVideoContext *ctx)
451{
452 av_freep(&ctx->frm0);
453 av_freep(&ctx->frm1);
454 av_freep(&ctx->frm2);
455 av_freep(&ctx->stored_frame);
456 av_freep(&ctx->rle_buf);
457 ctx->frm0_size =
458 ctx->frm1_size =
459 ctx->frm2_size = 0;
460 init_sizes(ctx, 0, 0);
461}
462
463static av_cold int init_buffers(SANMVideoContext *ctx)
464{
465 av_fast_padded_malloc(&ctx->frm0, &ctx->frm0_size, ctx->buf_size);
466 av_fast_padded_malloc(&ctx->frm1, &ctx->frm1_size, ctx->buf_size);
467 av_fast_padded_malloc(&ctx->frm2, &ctx->frm2_size, ctx->buf_size);
468 if (!ctx->version)
469 av_fast_padded_malloc(&ctx->stored_frame,
470 &ctx->stored_frame_size, ctx->buf_size);
471
472 if (!ctx->frm0 || !ctx->frm1 || !ctx->frm2 ||
473 (!ctx->stored_frame && !ctx->version)) {
474 destroy_buffers(ctx);
475 return AVERROR(ENOMEM);
476 }
477
478 return 0;
479}
480
481static void rotate_bufs(SANMVideoContext *ctx, int rotate_code)
482{
483 if (rotate_code == 2)
484 FFSWAP(uint16_t*, ctx->frm1, ctx->frm2);
485 FFSWAP(uint16_t*, ctx->frm2, ctx->frm0);
486}
487
488static av_cold int decode_init(AVCodecContext *avctx)
489{
490 SANMVideoContext *ctx = avctx->priv_data;
491
492 ctx->avctx = avctx;
493 ctx->version = !avctx->extradata_size;
494
495 avctx->pix_fmt = ctx->version ? AV_PIX_FMT_RGB565 : AV_PIX_FMT_PAL8;
496
497 init_sizes(ctx, avctx->width, avctx->height);
498 if (init_buffers(ctx)) {
499 av_log(avctx, AV_LOG_ERROR, "Error allocating buffers.\n");
500 return AVERROR(ENOMEM);
501 }
502
503 make_glyphs(ctx->p4x4glyphs[0], glyph4_x, glyph4_y, 4);
504 make_glyphs(ctx->p8x8glyphs[0], glyph8_x, glyph8_y, 8);
505
506 if (!ctx->version) {
507 int i;
508
509 if (avctx->extradata_size < 1026) {
510 av_log(avctx, AV_LOG_ERROR, "Not enough extradata.\n");
511 return AVERROR_INVALIDDATA;
512 }
513
514 ctx->subversion = AV_RL16(avctx->extradata);
515 for (i = 0; i < PALETTE_SIZE; i++)
516 ctx->pal[i] = 0xFFU << 24 | AV_RL32(avctx->extradata + 2 + i * 4);
517 }
518
519 return 0;
520}
521
522static av_cold int decode_end(AVCodecContext *avctx)
523{
524 SANMVideoContext *ctx = avctx->priv_data;
525
526 destroy_buffers(ctx);
527
528 return 0;
529}
530
531static int rle_decode(SANMVideoContext *ctx, uint8_t *dst, const int out_size)
532{
533 int opcode, color, run_len, left = out_size;
534
535 while (left > 0) {
536 opcode = bytestream2_get_byte(&ctx->gb);
537 run_len = (opcode >> 1) + 1;
538 if (run_len > left || bytestream2_get_bytes_left(&ctx->gb) <= 0)
539 return AVERROR_INVALIDDATA;
540
541 if (opcode & 1) {
542 color = bytestream2_get_byte(&ctx->gb);
543 memset(dst, color, run_len);
544 } else {
545 if (bytestream2_get_bytes_left(&ctx->gb) < run_len)
546 return AVERROR_INVALIDDATA;
547 bytestream2_get_bufferu(&ctx->gb, dst, run_len);
548 }
549
550 dst += run_len;
551 left -= run_len;
552 }
553
554 return 0;
555}
556
557static int old_codec1(SANMVideoContext *ctx, int top,
558 int left, int width, int height)
559{
560 uint8_t *dst = ((uint8_t *)ctx->frm0) + left + top * ctx->pitch;
561 int i, j, len, flag, code, val, pos, end;
562
563 for (i = 0; i < height; i++) {
564 pos = 0;
565
566 if (bytestream2_get_bytes_left(&ctx->gb) < 2)
567 return AVERROR_INVALIDDATA;
568
569 len = bytestream2_get_le16u(&ctx->gb);
570 end = bytestream2_tell(&ctx->gb) + len;
571
572 while (bytestream2_tell(&ctx->gb) < end) {
573 if (bytestream2_get_bytes_left(&ctx->gb) < 2)
574 return AVERROR_INVALIDDATA;
575
576 code = bytestream2_get_byteu(&ctx->gb);
577 flag = code & 1;
578 code = (code >> 1) + 1;
579 if (pos + code > width)
580 return AVERROR_INVALIDDATA;
581 if (flag) {
582 val = bytestream2_get_byteu(&ctx->gb);
583 if (val)
584 memset(dst + pos, val, code);
585 pos += code;
586 } else {
587 if (bytestream2_get_bytes_left(&ctx->gb) < code)
588 return AVERROR_INVALIDDATA;
589 for (j = 0; j < code; j++) {
590 val = bytestream2_get_byteu(&ctx->gb);
591 if (val)
592 dst[pos] = val;
593 pos++;
594 }
595 }
596 }
597 dst += ctx->pitch;
598 }
599 ctx->rotate_code = 0;
600
601 return 0;
602}
603
604static inline void codec37_mv(uint8_t *dst, const uint8_t *src,
605 int height, int stride, int x, int y)
606{
607 int pos, i, j;
608
609 pos = x + y * stride;
610 for (j = 0; j < 4; j++) {
611 for (i = 0; i < 4; i++) {
612 if ((pos + i) < 0 || (pos + i) >= height * stride)
613 dst[i] = 0;
614 else
615 dst[i] = src[i];
616 }
617 dst += stride;
618 src += stride;
619 pos += stride;
620 }
621}
622
623static int old_codec37(SANMVideoContext *ctx, int top,
624 int left, int width, int height)
625{
626 ptrdiff_t stride = ctx->pitch;
627 int i, j, k, t;
628 uint8_t *dst, *prev;
629 int skip_run = 0;
630 int compr = bytestream2_get_byte(&ctx->gb);
631 int mvoff = bytestream2_get_byte(&ctx->gb);
632 int seq = bytestream2_get_le16(&ctx->gb);
633 uint32_t decoded_size = bytestream2_get_le32(&ctx->gb);
634 int flags;
635
636 bytestream2_skip(&ctx->gb, 4);
637 flags = bytestream2_get_byte(&ctx->gb);
638 bytestream2_skip(&ctx->gb, 3);
639
640 if (decoded_size > ctx->height * stride - left - top * stride) {
641 decoded_size = ctx->height * stride - left - top * stride;
642 av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");
643 }
644
645 ctx->rotate_code = 0;
646
647 if (((seq & 1) || !(flags & 1)) && (compr && compr != 2))
648 rotate_bufs(ctx, 1);
649
650 dst = ((uint8_t*)ctx->frm0) + left + top * stride;
651 prev = ((uint8_t*)ctx->frm2) + left + top * stride;
652
653 if (mvoff > 2) {
654 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid motion base value %d.\n", mvoff);
655 return AVERROR_INVALIDDATA;
656 }
657
658 switch (compr) {
659 case 0:
660 for (i = 0; i < height; i++) {
661 bytestream2_get_buffer(&ctx->gb, dst, width);
662 dst += stride;
663 }
664 memset(ctx->frm1, 0, ctx->height * stride);
665 memset(ctx->frm2, 0, ctx->height * stride);
666 break;
667 case 2:
668 if (rle_decode(ctx, dst, decoded_size))
669 return AVERROR_INVALIDDATA;
670 memset(ctx->frm1, 0, ctx->frm1_size);
671 memset(ctx->frm2, 0, ctx->frm2_size);
672 break;
673 case 3:
674 case 4:
675 if (flags & 4) {
676 for (j = 0; j < height; j += 4) {
677 for (i = 0; i < width; i += 4) {
678 int code;
679 if (skip_run) {
680 skip_run--;
681 copy_block4(dst + i, prev + i, stride, stride, 4);
682 continue;
683 }
684 if (bytestream2_get_bytes_left(&ctx->gb) < 1)
685 return AVERROR_INVALIDDATA;
686 code = bytestream2_get_byteu(&ctx->gb);
687 switch (code) {
688 case 0xFF:
689 if (bytestream2_get_bytes_left(&ctx->gb) < 16)
690 return AVERROR_INVALIDDATA;
691 for (k = 0; k < 4; k++)
692 bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
693 break;
694 case 0xFE:
695 if (bytestream2_get_bytes_left(&ctx->gb) < 4)
696 return AVERROR_INVALIDDATA;
697 for (k = 0; k < 4; k++)
698 memset(dst + i + k * stride, bytestream2_get_byteu(&ctx->gb), 4);
699 break;
700 case 0xFD:
701 if (bytestream2_get_bytes_left(&ctx->gb) < 1)
702 return AVERROR_INVALIDDATA;
703 t = bytestream2_get_byteu(&ctx->gb);
704 for (k = 0; k < 4; k++)
705 memset(dst + i + k * stride, t, 4);
706 break;
707 default:
708 if (compr == 4 && !code) {
709 if (bytestream2_get_bytes_left(&ctx->gb) < 1)
710 return AVERROR_INVALIDDATA;
711 skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
712 i -= 4;
713 } else {
714 int mx, my;
715
716 mx = c37_mv[(mvoff * 255 + code) * 2];
717 my = c37_mv[(mvoff * 255 + code) * 2 + 1];
718 codec37_mv(dst + i, prev + i + mx + my * stride,
719 ctx->height, stride, i + mx, j + my);
720 }
721 }
722 }
723 dst += stride * 4;
724 prev += stride * 4;
725 }
726 } else {
727 for (j = 0; j < height; j += 4) {
728 for (i = 0; i < width; i += 4) {
729 int code;
730 if (skip_run) {
731 skip_run--;
732 copy_block4(dst + i, prev + i, stride, stride, 4);
733 continue;
734 }
735 code = bytestream2_get_byte(&ctx->gb);
736 if (code == 0xFF) {
737 if (bytestream2_get_bytes_left(&ctx->gb) < 16)
738 return AVERROR_INVALIDDATA;
739 for (k = 0; k < 4; k++)
740 bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
741 } else if (compr == 4 && !code) {
742 if (bytestream2_get_bytes_left(&ctx->gb) < 1)
743 return AVERROR_INVALIDDATA;
744 skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
745 i -= 4;
746 } else {
747 int mx, my;
748
749 mx = c37_mv[(mvoff * 255 + code) * 2];
750 my = c37_mv[(mvoff * 255 + code) * 2 + 1];
751 codec37_mv(dst + i, prev + i + mx + my * stride,
752 ctx->height, stride, i + mx, j + my);
753 }
754 }
755 dst += stride * 4;
756 prev += stride * 4;
757 }
758 }
759 break;
760 default:
761 avpriv_report_missing_feature(ctx->avctx,
762 "Subcodec 37 compression %d", compr);
763 return AVERROR_PATCHWELCOME;
764 }
765
766 return 0;
767}
768
769static int process_block(SANMVideoContext *ctx, uint8_t *dst, uint8_t *prev1,
770 uint8_t *prev2, int stride, int tbl, int size)
771{
772 int code, k, t;
773 uint8_t colors[2];
774 int8_t *pglyph;
775
776 if (bytestream2_get_bytes_left(&ctx->gb) < 1)
777 return AVERROR_INVALIDDATA;
778
779 code = bytestream2_get_byteu(&ctx->gb);
780 if (code >= 0xF8) {
781 switch (code) {
782 case 0xFF:
783 if (size == 2) {
784 if (bytestream2_get_bytes_left(&ctx->gb) < 4)
785 return AVERROR_INVALIDDATA;
786 dst[0] = bytestream2_get_byteu(&ctx->gb);
787 dst[1] = bytestream2_get_byteu(&ctx->gb);
788 dst[0 + stride] = bytestream2_get_byteu(&ctx->gb);
789 dst[1 + stride] = bytestream2_get_byteu(&ctx->gb);
790 } else {
791 size >>= 1;
792 if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
793 return AVERROR_INVALIDDATA;
794 if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
795 stride, tbl, size))
796 return AVERROR_INVALIDDATA;
797 dst += size * stride;
798 prev1 += size * stride;
799 prev2 += size * stride;
800 if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
801 return AVERROR_INVALIDDATA;
802 if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
803 stride, tbl, size))
804 return AVERROR_INVALIDDATA;
805 }
806 break;
807 case 0xFE:
808 if (bytestream2_get_bytes_left(&ctx->gb) < 1)
809 return AVERROR_INVALIDDATA;
810
811 t = bytestream2_get_byteu(&ctx->gb);
812 for (k = 0; k < size; k++)
813 memset(dst + k * stride, t, size);
814 break;
815 case 0xFD:
816 if (bytestream2_get_bytes_left(&ctx->gb) < 3)
817 return AVERROR_INVALIDDATA;
818
819 code = bytestream2_get_byteu(&ctx->gb);
820 pglyph = (size == 8) ? ctx->p8x8glyphs[code] : ctx->p4x4glyphs[code];
821 bytestream2_get_bufferu(&ctx->gb, colors, 2);
822
823 for (k = 0; k < size; k++)
824 for (t = 0; t < size; t++)
825 dst[t + k * stride] = colors[!*pglyph++];
826 break;
827 case 0xFC:
828 for (k = 0; k < size; k++)
829 memcpy(dst + k * stride, prev1 + k * stride, size);
830 break;
831 default:
832 k = bytestream2_tell(&ctx->gb);
833 bytestream2_seek(&ctx->gb, tbl + (code & 7), SEEK_SET);
834 t = bytestream2_get_byte(&ctx->gb);
835 bytestream2_seek(&ctx->gb, k, SEEK_SET);
836 for (k = 0; k < size; k++)
837 memset(dst + k * stride, t, size);
838 }
839 } else {
840 int mx = motion_vectors[code][0];
841 int my = motion_vectors[code][1];
842 int index = prev2 - (const uint8_t *)ctx->frm2;
843
844 av_assert2(index >= 0 && index < (ctx->buf_size >> 1));
845
846 if (index < -mx - my * stride ||
847 (ctx->buf_size >> 1) - index < mx + size + (my + size - 1) * stride) {
848 av_log(ctx->avctx, AV_LOG_ERROR, "MV is invalid.\n");
849 return AVERROR_INVALIDDATA;
850 }
851
852 for (k = 0; k < size; k++)
853 memcpy(dst + k * stride, prev2 + mx + (my + k) * stride, size);
854 }
855
856 return 0;
857}
858
859static int old_codec47(SANMVideoContext *ctx, int top,
860 int left, int width, int height)
861{
862 uint32_t decoded_size;
863 int i, j;
864 ptrdiff_t stride = ctx->pitch;
865 uint8_t *dst = (uint8_t *)ctx->frm0 + left + top * stride;
866 uint8_t *prev1 = (uint8_t *)ctx->frm1;
867 uint8_t *prev2 = (uint8_t *)ctx->frm2;
868 int tbl_pos = bytestream2_tell(&ctx->gb);
869 int seq = bytestream2_get_le16(&ctx->gb);
870 int compr = bytestream2_get_byte(&ctx->gb);
871 int new_rot = bytestream2_get_byte(&ctx->gb);
872 int skip = bytestream2_get_byte(&ctx->gb);
873
874 bytestream2_skip(&ctx->gb, 9);
875 decoded_size = bytestream2_get_le32(&ctx->gb);
876 bytestream2_skip(&ctx->gb, 8);
877
878 if (decoded_size > ctx->height * stride - left - top * stride) {
879 decoded_size = ctx->height * stride - left - top * stride;
880 av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");
881 }
882
883 if (skip & 1)
884 bytestream2_skip(&ctx->gb, 0x8080);
885 if (!seq) {
886 ctx->prev_seq = -1;
887 memset(prev1, 0, ctx->height * stride);
888 memset(prev2, 0, ctx->height * stride);
889 }
890
891 switch (compr) {
892 case 0:
893 if (bytestream2_get_bytes_left(&ctx->gb) < width * height)
894 return AVERROR_INVALIDDATA;
895 for (j = 0; j < height; j++) {
896 bytestream2_get_bufferu(&ctx->gb, dst, width);
897 dst += stride;
898 }
899 break;
900 case 1:
901 if (bytestream2_get_bytes_left(&ctx->gb) < ((width + 1) >> 1) * ((height + 1) >> 1))
902 return AVERROR_INVALIDDATA;
903 for (j = 0; j < height; j += 2) {
904 for (i = 0; i < width; i += 2) {
905 dst[i] =
906 dst[i + 1] =
907 dst[stride + i] =
908 dst[stride + i + 1] = bytestream2_get_byteu(&ctx->gb);
909 }
910 dst += stride * 2;
911 }
912 break;
913 case 2:
914 if (seq == ctx->prev_seq + 1) {
915 for (j = 0; j < height; j += 8) {
916 for (i = 0; i < width; i += 8)
917 if (process_block(ctx, dst + i, prev1 + i, prev2 + i, stride,
918 tbl_pos + 8, 8))
919 return AVERROR_INVALIDDATA;
920 dst += stride * 8;
921 prev1 += stride * 8;
922 prev2 += stride * 8;
923 }
924 }
925 break;
926 case 3:
927 memcpy(ctx->frm0, ctx->frm2, ctx->pitch * ctx->height);
928 break;
929 case 4:
930 memcpy(ctx->frm0, ctx->frm1, ctx->pitch * ctx->height);
931 break;
932 case 5:
933 if (rle_decode(ctx, dst, decoded_size))
934 return AVERROR_INVALIDDATA;
935 break;
936 default:
937 avpriv_report_missing_feature(ctx->avctx,
938 "Subcodec 47 compression %d", compr);
939 return AVERROR_PATCHWELCOME;
940 }
941 if (seq == ctx->prev_seq + 1)
942 ctx->rotate_code = new_rot;
943 else
944 ctx->rotate_code = 0;
945 ctx->prev_seq = seq;
946
947 return 0;
948}
949
950static int process_frame_obj(SANMVideoContext *ctx)
951{
952 uint16_t codec = bytestream2_get_le16u(&ctx->gb);
953 uint16_t left = bytestream2_get_le16u(&ctx->gb);
954 uint16_t top = bytestream2_get_le16u(&ctx->gb);
955 uint16_t w = bytestream2_get_le16u(&ctx->gb);
956 uint16_t h = bytestream2_get_le16u(&ctx->gb);
957
958 if (!w || !h) {
959 av_log(ctx->avctx, AV_LOG_ERROR, "Dimensions are invalid.\n");
960 return AVERROR_INVALIDDATA;
961 }
962
963 if (ctx->width < left + w || ctx->height < top + h) {
964 int ret = ff_set_dimensions(ctx->avctx, FFMAX(left + w, ctx->width),
965 FFMAX(top + h, ctx->height));
966 if (ret < 0)
967 return ret;
968 init_sizes(ctx, FFMAX(left + w, ctx->width),
969 FFMAX(top + h, ctx->height));
970 if (init_buffers(ctx)) {
971 av_log(ctx->avctx, AV_LOG_ERROR, "Error resizing buffers.\n");
972 return AVERROR(ENOMEM);
973 }
974 }
975 bytestream2_skip(&ctx->gb, 4);
976
977 switch (codec) {
978 case 1:
979 case 3:
980 return old_codec1(ctx, top, left, w, h);
981 case 37:
982 return old_codec37(ctx, top, left, w, h);
983 case 47:
984 return old_codec47(ctx, top, left, w, h);
985 default:
986 avpriv_request_sample(ctx->avctx, "Subcodec %d", codec);
987 return AVERROR_PATCHWELCOME;
988 }
989}
990
991static int decode_0(SANMVideoContext *ctx)
992{
993 uint16_t *frm = ctx->frm0;
994 int x, y;
995
996 if (bytestream2_get_bytes_left(&ctx->gb) < ctx->width * ctx->height * 2) {
997 av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for raw frame.\n");
998 return AVERROR_INVALIDDATA;
999 }
1000 for (y = 0; y < ctx->height; y++) {
1001 for (x = 0; x < ctx->width; x++)
1002 frm[x] = bytestream2_get_le16u(&ctx->gb);
1003 frm += ctx->pitch;
1004 }
1005 return 0;
1006}
1007
1008static int decode_nop(SANMVideoContext *ctx)
1009{
1010 avpriv_request_sample(ctx->avctx, "Unknown/unsupported compression type");
1011 return AVERROR_PATCHWELCOME;
1012}
1013
1014static void copy_block(uint16_t *pdest, uint16_t *psrc, int block_size, ptrdiff_t pitch)
1015{
1016 uint8_t *dst = (uint8_t *)pdest;
1017 uint8_t *src = (uint8_t *)psrc;
1018 ptrdiff_t stride = pitch * 2;
1019
1020 switch (block_size) {
1021 case 2:
1022 copy_block4(dst, src, stride, stride, 2);
1023 break;
1024 case 4:
1025 copy_block8(dst, src, stride, stride, 4);
1026 break;
1027 case 8:
1028 copy_block16(dst, src, stride, stride, 8);
1029 break;
1030 }
1031}
1032
1033static void fill_block(uint16_t *pdest, uint16_t color, int block_size, ptrdiff_t pitch)
1034{
1035 int x, y;
1036
1037 pitch -= block_size;
1038 for (y = 0; y < block_size; y++, pdest += pitch)
1039 for (x = 0; x < block_size; x++)
1040 *pdest++ = color;
1041}
1042
1043static int draw_glyph(SANMVideoContext *ctx, uint16_t *dst, int index,
1044 uint16_t fg_color, uint16_t bg_color, int block_size,
1045 ptrdiff_t pitch)
1046{
1047 int8_t *pglyph;
1048 uint16_t colors[2] = { fg_color, bg_color };
1049 int x, y;
1050
1051 if (index >= NGLYPHS) {
1052 av_log(ctx->avctx, AV_LOG_ERROR, "Ignoring nonexistent glyph #%u.\n", index);
1053 return AVERROR_INVALIDDATA;
1054 }
1055
1056 pglyph = block_size == 8 ? ctx->p8x8glyphs[index] : ctx->p4x4glyphs[index];
1057 pitch -= block_size;
1058
1059 for (y = 0; y < block_size; y++, dst += pitch)
1060 for (x = 0; x < block_size; x++)
1061 *dst++ = colors[*pglyph++];
1062 return 0;
1063}
1064
1065static int opcode_0xf7(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)
1066{
1067 uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
1068
1069 if (block_size == 2) {
1070 uint32_t indices;
1071
1072 if (bytestream2_get_bytes_left(&ctx->gb) < 4)
1073 return AVERROR_INVALIDDATA;
1074
1075 indices = bytestream2_get_le32u(&ctx->gb);
1076 dst[0] = ctx->codebook[indices & 0xFF];
1077 indices >>= 8;
1078 dst[1] = ctx->codebook[indices & 0xFF];
1079 indices >>= 8;
1080 dst[pitch] = ctx->codebook[indices & 0xFF];
1081 indices >>= 8;
1082 dst[pitch + 1] = ctx->codebook[indices & 0xFF];
1083 } else {
1084 uint16_t fgcolor, bgcolor;
1085 int glyph;
1086
1087 if (bytestream2_get_bytes_left(&ctx->gb) < 3)
1088 return AVERROR_INVALIDDATA;
1089
1090 glyph = bytestream2_get_byteu(&ctx->gb);
1091 bgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
1092 fgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
1093
1094 draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
1095 }
1096 return 0;
1097}
1098
1099static int opcode_0xf8(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)
1100{
1101 uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
1102
1103 if (block_size == 2) {
1104 if (bytestream2_get_bytes_left(&ctx->gb) < 8)
1105 return AVERROR_INVALIDDATA;
1106
1107 dst[0] = bytestream2_get_le16u(&ctx->gb);
1108 dst[1] = bytestream2_get_le16u(&ctx->gb);
1109 dst[pitch] = bytestream2_get_le16u(&ctx->gb);
1110 dst[pitch + 1] = bytestream2_get_le16u(&ctx->gb);
1111 } else {
1112 uint16_t fgcolor, bgcolor;
1113 int glyph;
1114
1115 if (bytestream2_get_bytes_left(&ctx->gb) < 5)
1116 return AVERROR_INVALIDDATA;
1117
1118 glyph = bytestream2_get_byteu(&ctx->gb);
1119 bgcolor = bytestream2_get_le16u(&ctx->gb);
1120 fgcolor = bytestream2_get_le16u(&ctx->gb);
1121
1122 draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
1123 }
1124 return 0;
1125}
1126
1127static int good_mvec(SANMVideoContext *ctx, int cx, int cy, int mx, int my,
1128 int block_size)
1129{
1130 int start_pos = cx + mx + (cy + my) * ctx->pitch;
1131 int end_pos = start_pos + (block_size - 1) * (ctx->pitch + 1);
1132
1133 int good = start_pos >= 0 && end_pos < (ctx->buf_size >> 1);
1134
1135 if (!good)
1136 av_log(ctx->avctx, AV_LOG_ERROR,
1137 "Ignoring invalid motion vector (%i, %i)->(%u, %u), block size = %u\n",
1138 cx + mx, cy + my, cx, cy, block_size);
1139
1140 return good;
1141}
1142
1143static int codec2subblock(SANMVideoContext *ctx, int cx, int cy, int blk_size)
1144{
1145 int16_t mx, my, index;
1146 int opcode;
1147
1148 if (bytestream2_get_bytes_left(&ctx->gb) < 1)
1149 return AVERROR_INVALIDDATA;
1150
1151 opcode = bytestream2_get_byteu(&ctx->gb);
1152
1153 switch (opcode) {
1154 default:
1155 mx = motion_vectors[opcode][0];
1156 my = motion_vectors[opcode][1];
1157
1158 if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
1159 copy_block(ctx->frm0 + cx + ctx->pitch * cy,
1160 ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
1161 blk_size, ctx->pitch);
1162 }
1163 break;
1164 case 0xF5:
1165 if (bytestream2_get_bytes_left(&ctx->gb) < 2)
1166 return AVERROR_INVALIDDATA;
1167 index = bytestream2_get_le16u(&ctx->gb);
1168
1169 mx = index % ctx->width;
1170 my = index / ctx->width;
1171
1172 if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
1173 copy_block(ctx->frm0 + cx + ctx->pitch * cy,
1174 ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
1175 blk_size, ctx->pitch);
1176 }
1177 break;
1178 case 0xF6:
1179 copy_block(ctx->frm0 + cx + ctx->pitch * cy,
1180 ctx->frm1 + cx + ctx->pitch * cy,
1181 blk_size, ctx->pitch);
1182 break;
1183 case 0xF7:
1184 opcode_0xf7(ctx, cx, cy, blk_size, ctx->pitch);
1185 break;
1186
1187 case 0xF8:
1188 opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
1189 break;
1190 case 0xF9:
1191 case 0xFA:
1192 case 0xFB:
1193 case 0xFC:
1194 fill_block(ctx->frm0 + cx + cy * ctx->pitch,
1195 ctx->small_codebook[opcode - 0xf9], blk_size, ctx->pitch);
1196 break;
1197 case 0xFD:
1198 if (bytestream2_get_bytes_left(&ctx->gb) < 1)
1199 return AVERROR_INVALIDDATA;
1200 fill_block(ctx->frm0 + cx + cy * ctx->pitch,
1201 ctx->codebook[bytestream2_get_byteu(&ctx->gb)], blk_size, ctx->pitch);
1202 break;
1203 case 0xFE:
1204 if (bytestream2_get_bytes_left(&ctx->gb) < 2)
1205 return AVERROR_INVALIDDATA;
1206 fill_block(ctx->frm0 + cx + cy * ctx->pitch,
1207 bytestream2_get_le16u(&ctx->gb), blk_size, ctx->pitch);
1208 break;
1209 case 0xFF:
1210 if (blk_size == 2) {
1211 opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
1212 } else {
1213 blk_size >>= 1;
1214 if (codec2subblock(ctx, cx, cy, blk_size))
1215 return AVERROR_INVALIDDATA;
1216 if (codec2subblock(ctx, cx + blk_size, cy, blk_size))
1217 return AVERROR_INVALIDDATA;
1218 if (codec2subblock(ctx, cx, cy + blk_size, blk_size))
1219 return AVERROR_INVALIDDATA;
1220 if (codec2subblock(ctx, cx + blk_size, cy + blk_size, blk_size))
1221 return AVERROR_INVALIDDATA;
1222 }
1223 break;
1224 }
1225 return 0;
1226}
1227
1228static int decode_2(SANMVideoContext *ctx)
1229{
1230 int cx, cy, ret;
1231
1232 for (cy = 0; cy < ctx->aligned_height; cy += 8)
1233 for (cx = 0; cx < ctx->aligned_width; cx += 8)
1234 if (ret = codec2subblock(ctx, cx, cy, 8))
1235 return ret;
1236
1237 return 0;
1238}
1239
1240static int decode_3(SANMVideoContext *ctx)
1241{
1242 memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);
1243 return 0;
1244}
1245
1246static int decode_4(SANMVideoContext *ctx)
1247{
1248 memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);
1249 return 0;
1250}
1251
1252static int decode_5(SANMVideoContext *ctx)
1253{
1254#if HAVE_BIGENDIAN
1255 uint16_t *frm;
1256 int npixels;
1257#endif
1258 uint8_t *dst = (uint8_t*)ctx->frm0;
1259
1260 if (rle_decode(ctx, dst, ctx->buf_size))
1261 return AVERROR_INVALIDDATA;
1262
1263#if HAVE_BIGENDIAN
1264 npixels = ctx->npixels;
1265 frm = ctx->frm0;
1266 while (npixels--) {
1267 *frm = av_bswap16(*frm);
1268 frm++;
1269 }
1270#endif
1271
1272 return 0;
1273}
1274
1275static int decode_6(SANMVideoContext *ctx)
1276{
1277 int npixels = ctx->npixels;
1278 uint16_t *frm = ctx->frm0;
1279
1280 if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {
1281 av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for frame.\n");
1282 return AVERROR_INVALIDDATA;
1283 }
1284 while (npixels--)
1285 *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
1286
1287 return 0;
1288}
1289
1290static int decode_8(SANMVideoContext *ctx)
1291{
1292 uint16_t *pdest = ctx->frm0;
1293 uint8_t *rsrc;
1294 long npixels = ctx->npixels;
1295
1296 av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);
1297 if (!ctx->rle_buf) {
1298 av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed.\n");
1299 return AVERROR(ENOMEM);
1300 }
1301 rsrc = ctx->rle_buf;
1302
1303 if (rle_decode(ctx, rsrc, npixels))
1304 return AVERROR_INVALIDDATA;
1305
1306 while (npixels--)
1307 *pdest++ = ctx->codebook[*rsrc++];
1308
1309 return 0;
1310}
1311
1312typedef int (*frm_decoder)(SANMVideoContext *ctx);
1313
1314static const frm_decoder v1_decoders[] = {
1315 decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,
1316 decode_6, decode_nop, decode_8
1317};
1318
1319static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)
1320{
1321 int i, ret;
1322
1323 if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {
1324 av_log(ctx->avctx, AV_LOG_ERROR, "Input frame too short (%d bytes).\n",
1325 ret);
1326 return AVERROR_INVALIDDATA;
1327 }
1328 bytestream2_skip(&ctx->gb, 8); // skip pad
1329
1330 hdr->width = bytestream2_get_le32u(&ctx->gb);
1331 hdr->height = bytestream2_get_le32u(&ctx->gb);
1332
1333 if (hdr->width != ctx->width || hdr->height != ctx->height) {
1334 avpriv_report_missing_feature(ctx->avctx, "Variable size frames");
1335 return AVERROR_PATCHWELCOME;
1336 }
1337
1338 hdr->seq_num = bytestream2_get_le16u(&ctx->gb);
1339 hdr->codec = bytestream2_get_byteu(&ctx->gb);
1340 hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);
1341
1342 bytestream2_skip(&ctx->gb, 4); // skip pad
1343
1344 for (i = 0; i < 4; i++)
1345 ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);
1346 hdr->bg_color = bytestream2_get_le16u(&ctx->gb);
1347
1348 bytestream2_skip(&ctx->gb, 2); // skip pad
1349
1350 hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);
1351 for (i = 0; i < 256; i++)
1352 ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);
1353
1354 bytestream2_skip(&ctx->gb, 8); // skip pad
1355
1356 return 0;
1357}
1358
1359static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)
1360{
1361 while (buf_size--)
1362 *pbuf++ = color;
1363}
1364
1365static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)
1366{
1367 uint8_t *dst;
1368 const uint8_t *src = (uint8_t*) ctx->frm0;
1369 int ret, height = ctx->height;
1370 ptrdiff_t dstpitch, srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);
1371
1372 if ((ret = ff_get_buffer(ctx->avctx, ctx->frame, 0)) < 0)
1373 return ret;
1374
1375 dst = ctx->frame->data[0];
1376 dstpitch = ctx->frame->linesize[0];
1377
1378 while (height--) {
1379 memcpy(dst, src, srcpitch);
1380 src += srcpitch;
1381 dst += dstpitch;
1382 }
1383
1384 return 0;
1385}
1386
1387static int decode_frame(AVCodecContext *avctx, void *data,
1388 int *got_frame_ptr, AVPacket *pkt)
1389{
1390 SANMVideoContext *ctx = avctx->priv_data;
1391 int i, ret;
1392
1393 ctx->frame = data;
1394 bytestream2_init(&ctx->gb, pkt->data, pkt->size);
1395
1396 if (!ctx->version) {
1397 int to_store = 0;
1398
1399 while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {
1400 uint32_t sig, size;
1401 int pos;
1402
1403 sig = bytestream2_get_be32u(&ctx->gb);
1404 size = bytestream2_get_be32u(&ctx->gb);
1405 pos = bytestream2_tell(&ctx->gb);
1406
1407 if (bytestream2_get_bytes_left(&ctx->gb) < size) {
1408 av_log(avctx, AV_LOG_ERROR, "Incorrect chunk size %"PRIu32".\n", size);
1409 break;
1410 }
1411 switch (sig) {
1412 case MKBETAG('N', 'P', 'A', 'L'):
1413 if (size != PALETTE_SIZE * 3) {
1414 av_log(avctx, AV_LOG_ERROR,
1415 "Incorrect palette block size %"PRIu32".\n", size);
1416 return AVERROR_INVALIDDATA;
1417 }
1418 for (i = 0; i < PALETTE_SIZE; i++)
1419 ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
1420 break;
1421 case MKBETAG('F', 'O', 'B', 'J'):
1422 if (size < 16)
1423 return AVERROR_INVALIDDATA;
1424 if (ret = process_frame_obj(ctx))
1425 return ret;
1426 break;
1427 case MKBETAG('X', 'P', 'A', 'L'):
1428 if (size == 6 || size == 4) {
1429 uint8_t tmp[3];
1430 int j;
1431
1432 for (i = 0; i < PALETTE_SIZE; i++) {
1433 for (j = 0; j < 3; j++) {
1434 int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;
1435 tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);
1436 }
1437 ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);
1438 }
1439 } else {
1440 if (size < PALETTE_DELTA * 2 + 4) {
1441 av_log(avctx, AV_LOG_ERROR,
1442 "Incorrect palette change block size %"PRIu32".\n",
1443 size);
1444 return AVERROR_INVALIDDATA;
1445 }
1446 bytestream2_skipu(&ctx->gb, 4);
1447 for (i = 0; i < PALETTE_DELTA; i++)
1448 ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);
1449 if (size >= PALETTE_DELTA * 5 + 4) {
1450 for (i = 0; i < PALETTE_SIZE; i++)
1451 ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
1452 } else {
1453 memset(ctx->pal, 0, sizeof(ctx->pal));
1454 }
1455 }
1456 break;
1457 case MKBETAG('S', 'T', 'O', 'R'):
1458 to_store = 1;
1459 break;
1460 case MKBETAG('F', 'T', 'C', 'H'):
1461 memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);
1462 break;
1463 default:
1464 bytestream2_skip(&ctx->gb, size);
1465 av_log(avctx, AV_LOG_DEBUG,
1466 "Unknown/unsupported chunk %"PRIx32".\n", sig);
1467 break;
1468 }
1469
1470 bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);
1471 if (size & 1)
1472 bytestream2_skip(&ctx->gb, 1);
1473 }
1474 if (to_store)
1475 memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);
1476 if ((ret = copy_output(ctx, NULL)))
1477 return ret;
1478 memcpy(ctx->frame->data[1], ctx->pal, 1024);
1479 } else {
1480 SANMFrameHeader header;
1481
1482 if ((ret = read_frame_header(ctx, &header)))
1483 return ret;
1484
1485 ctx->rotate_code = header.rotate_code;
1486 if ((ctx->frame->key_frame = !header.seq_num)) {
1487 ctx->frame->pict_type = AV_PICTURE_TYPE_I;
1488 fill_frame(ctx->frm1, ctx->npixels, header.bg_color);
1489 fill_frame(ctx->frm2, ctx->npixels, header.bg_color);
1490 } else {
1491 ctx->frame->pict_type = AV_PICTURE_TYPE_P;
1492 }
1493
1494 if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {
1495 if ((ret = v1_decoders[header.codec](ctx))) {
1496 av_log(avctx, AV_LOG_ERROR,
1497 "Subcodec %d: error decoding frame.\n", header.codec);
1498 return ret;
1499 }
1500 } else {
1501 avpriv_request_sample(avctx, "Subcodec %d", header.codec);
1502 return AVERROR_PATCHWELCOME;
1503 }
1504
1505 if ((ret = copy_output(ctx, &header)))
1506 return ret;
1507 }
1508 if (ctx->rotate_code)
1509 rotate_bufs(ctx, ctx->rotate_code);
1510
1511 *got_frame_ptr = 1;
1512
1513 return pkt->size;
1514}
1515
1516AVCodec ff_sanm_decoder = {
1517 .name = "sanm",
1518 .long_name = NULL_IF_CONFIG_SMALL("LucasArts SANM/Smush video"),
1519 .type = AVMEDIA_TYPE_VIDEO,
1520 .id = AV_CODEC_ID_SANM,
1521 .priv_data_size = sizeof(SANMVideoContext),
1522 .init = decode_init,
1523 .close = decode_end,
1524 .decode = decode_frame,
1525 .capabilities = AV_CODEC_CAP_DR1,
1526};
1527
generated by cgit at 2024-05-17 03:22:35 (GMT)