FFmpeg
sanm.c
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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 "codec_internal.h"
31 #include "internal.h"
32 
33 #define NGLYPHS 256
34 #define GLYPH_COORD_VECT_SIZE 16
35 #define PALETTE_SIZE 256
36 #define PALETTE_DELTA 768
37 
38 static const int8_t glyph4_x[GLYPH_COORD_VECT_SIZE] = {
39  0, 1, 2, 3, 3, 3, 3, 2, 1, 0, 0, 0, 1, 2, 2, 1
40 };
41 
42 static const int8_t glyph4_y[GLYPH_COORD_VECT_SIZE] = {
43  0, 0, 0, 0, 1, 2, 3, 3, 3, 3, 2, 1, 1, 1, 2, 2
44 };
45 
46 static const int8_t glyph8_x[GLYPH_COORD_VECT_SIZE] = {
47  0, 2, 5, 7, 7, 7, 7, 7, 7, 5, 2, 0, 0, 0, 0, 0
48 };
49 
50 static const int8_t glyph8_y[GLYPH_COORD_VECT_SIZE] = {
51  0, 0, 0, 0, 1, 3, 4, 6, 7, 7, 7, 7, 6, 4, 3, 1
52 };
53 
54 static const int8_t motion_vectors[256][2] = {
55  { 0, 0 }, { -1, -43 }, { 6, -43 }, { -9, -42 }, { 13, -41 },
56  { -16, -40 }, { 19, -39 }, { -23, -36 }, { 26, -34 }, { -2, -33 },
57  { 4, -33 }, { -29, -32 }, { -9, -32 }, { 11, -31 }, { -16, -29 },
58  { 32, -29 }, { 18, -28 }, { -34, -26 }, { -22, -25 }, { -1, -25 },
59  { 3, -25 }, { -7, -24 }, { 8, -24 }, { 24, -23 }, { 36, -23 },
60  { -12, -22 }, { 13, -21 }, { -38, -20 }, { 0, -20 }, { -27, -19 },
61  { -4, -19 }, { 4, -19 }, { -17, -18 }, { -8, -17 }, { 8, -17 },
62  { 18, -17 }, { 28, -17 }, { 39, -17 }, { -12, -15 }, { 12, -15 },
63  { -21, -14 }, { -1, -14 }, { 1, -14 }, { -41, -13 }, { -5, -13 },
64  { 5, -13 }, { 21, -13 }, { -31, -12 }, { -15, -11 }, { -8, -11 },
65  { 8, -11 }, { 15, -11 }, { -2, -10 }, { 1, -10 }, { 31, -10 },
66  { -23, -9 }, { -11, -9 }, { -5, -9 }, { 4, -9 }, { 11, -9 },
67  { 42, -9 }, { 6, -8 }, { 24, -8 }, { -18, -7 }, { -7, -7 },
68  { -3, -7 }, { -1, -7 }, { 2, -7 }, { 18, -7 }, { -43, -6 },
69  { -13, -6 }, { -4, -6 }, { 4, -6 }, { 8, -6 }, { -33, -5 },
70  { -9, -5 }, { -2, -5 }, { 0, -5 }, { 2, -5 }, { 5, -5 },
71  { 13, -5 }, { -25, -4 }, { -6, -4 }, { -3, -4 }, { 3, -4 },
72  { 9, -4 }, { -19, -3 }, { -7, -3 }, { -4, -3 }, { -2, -3 },
73  { -1, -3 }, { 0, -3 }, { 1, -3 }, { 2, -3 }, { 4, -3 },
74  { 6, -3 }, { 33, -3 }, { -14, -2 }, { -10, -2 }, { -5, -2 },
75  { -3, -2 }, { -2, -2 }, { -1, -2 }, { 0, -2 }, { 1, -2 },
76  { 2, -2 }, { 3, -2 }, { 5, -2 }, { 7, -2 }, { 14, -2 },
77  { 19, -2 }, { 25, -2 }, { 43, -2 }, { -7, -1 }, { -3, -1 },
78  { -2, -1 }, { -1, -1 }, { 0, -1 }, { 1, -1 }, { 2, -1 },
79  { 3, -1 }, { 10, -1 }, { -5, 0 }, { -3, 0 }, { -2, 0 },
80  { -1, 0 }, { 1, 0 }, { 2, 0 }, { 3, 0 }, { 5, 0 },
81  { 7, 0 }, { -10, 1 }, { -7, 1 }, { -3, 1 }, { -2, 1 },
82  { -1, 1 }, { 0, 1 }, { 1, 1 }, { 2, 1 }, { 3, 1 },
83  { -43, 2 }, { -25, 2 }, { -19, 2 }, { -14, 2 }, { -5, 2 },
84  { -3, 2 }, { -2, 2 }, { -1, 2 }, { 0, 2 }, { 1, 2 },
85  { 2, 2 }, { 3, 2 }, { 5, 2 }, { 7, 2 }, { 10, 2 },
86  { 14, 2 }, { -33, 3 }, { -6, 3 }, { -4, 3 }, { -2, 3 },
87  { -1, 3 }, { 0, 3 }, { 1, 3 }, { 2, 3 }, { 4, 3 },
88  { 19, 3 }, { -9, 4 }, { -3, 4 }, { 3, 4 }, { 7, 4 },
89  { 25, 4 }, { -13, 5 }, { -5, 5 }, { -2, 5 }, { 0, 5 },
90  { 2, 5 }, { 5, 5 }, { 9, 5 }, { 33, 5 }, { -8, 6 },
91  { -4, 6 }, { 4, 6 }, { 13, 6 }, { 43, 6 }, { -18, 7 },
92  { -2, 7 }, { 0, 7 }, { 2, 7 }, { 7, 7 }, { 18, 7 },
93  { -24, 8 }, { -6, 8 }, { -42, 9 }, { -11, 9 }, { -4, 9 },
94  { 5, 9 }, { 11, 9 }, { 23, 9 }, { -31, 10 }, { -1, 10 },
95  { 2, 10 }, { -15, 11 }, { -8, 11 }, { 8, 11 }, { 15, 11 },
96  { 31, 12 }, { -21, 13 }, { -5, 13 }, { 5, 13 }, { 41, 13 },
97  { -1, 14 }, { 1, 14 }, { 21, 14 }, { -12, 15 }, { 12, 15 },
98  { -39, 17 }, { -28, 17 }, { -18, 17 }, { -8, 17 }, { 8, 17 },
99  { 17, 18 }, { -4, 19 }, { 0, 19 }, { 4, 19 }, { 27, 19 },
100  { 38, 20 }, { -13, 21 }, { 12, 22 }, { -36, 23 }, { -24, 23 },
101  { -8, 24 }, { 7, 24 }, { -3, 25 }, { 1, 25 }, { 22, 25 },
102  { 34, 26 }, { -18, 28 }, { -32, 29 }, { 16, 29 }, { -11, 31 },
103  { 9, 32 }, { 29, 32 }, { -4, 33 }, { 2, 33 }, { -26, 34 },
104  { 23, 36 }, { -19, 39 }, { 16, 40 }, { -13, 41 }, { 9, 42 },
105  { -6, 43 }, { 1, 43 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
106 };
107 
108 static const int8_t c37_mv[] = {
109  0, 0, 1, 0, 2, 0, 3, 0, 5, 0,
110  8, 0, 13, 0, 21, 0, -1, 0, -2, 0,
111  -3, 0, -5, 0, -8, 0, -13, 0, -17, 0,
112  -21, 0, 0, 1, 1, 1, 2, 1, 3, 1,
113  5, 1, 8, 1, 13, 1, 21, 1, -1, 1,
114  -2, 1, -3, 1, -5, 1, -8, 1, -13, 1,
115  -17, 1, -21, 1, 0, 2, 1, 2, 2, 2,
116  3, 2, 5, 2, 8, 2, 13, 2, 21, 2,
117  -1, 2, -2, 2, -3, 2, -5, 2, -8, 2,
118  -13, 2, -17, 2, -21, 2, 0, 3, 1, 3,
119  2, 3, 3, 3, 5, 3, 8, 3, 13, 3,
120  21, 3, -1, 3, -2, 3, -3, 3, -5, 3,
121  -8, 3, -13, 3, -17, 3, -21, 3, 0, 5,
122  1, 5, 2, 5, 3, 5, 5, 5, 8, 5,
123  13, 5, 21, 5, -1, 5, -2, 5, -3, 5,
124  -5, 5, -8, 5, -13, 5, -17, 5, -21, 5,
125  0, 8, 1, 8, 2, 8, 3, 8, 5, 8,
126  8, 8, 13, 8, 21, 8, -1, 8, -2, 8,
127  -3, 8, -5, 8, -8, 8, -13, 8, -17, 8,
128  -21, 8, 0, 13, 1, 13, 2, 13, 3, 13,
129  5, 13, 8, 13, 13, 13, 21, 13, -1, 13,
130  -2, 13, -3, 13, -5, 13, -8, 13, -13, 13,
131  -17, 13, -21, 13, 0, 21, 1, 21, 2, 21,
132  3, 21, 5, 21, 8, 21, 13, 21, 21, 21,
133  -1, 21, -2, 21, -3, 21, -5, 21, -8, 21,
134  -13, 21, -17, 21, -21, 21, 0, -1, 1, -1,
135  2, -1, 3, -1, 5, -1, 8, -1, 13, -1,
136  21, -1, -1, -1, -2, -1, -3, -1, -5, -1,
137  -8, -1, -13, -1, -17, -1, -21, -1, 0, -2,
138  1, -2, 2, -2, 3, -2, 5, -2, 8, -2,
139  13, -2, 21, -2, -1, -2, -2, -2, -3, -2,
140  -5, -2, -8, -2, -13, -2, -17, -2, -21, -2,
141  0, -3, 1, -3, 2, -3, 3, -3, 5, -3,
142  8, -3, 13, -3, 21, -3, -1, -3, -2, -3,
143  -3, -3, -5, -3, -8, -3, -13, -3, -17, -3,
144  -21, -3, 0, -5, 1, -5, 2, -5, 3, -5,
145  5, -5, 8, -5, 13, -5, 21, -5, -1, -5,
146  -2, -5, -3, -5, -5, -5, -8, -5, -13, -5,
147  -17, -5, -21, -5, 0, -8, 1, -8, 2, -8,
148  3, -8, 5, -8, 8, -8, 13, -8, 21, -8,
149  -1, -8, -2, -8, -3, -8, -5, -8, -8, -8,
150  -13, -8, -17, -8, -21, -8, 0, -13, 1, -13,
151  2, -13, 3, -13, 5, -13, 8, -13, 13, -13,
152  21, -13, -1, -13, -2, -13, -3, -13, -5, -13,
153  -8, -13, -13, -13, -17, -13, -21, -13, 0, -17,
154  1, -17, 2, -17, 3, -17, 5, -17, 8, -17,
155  13, -17, 21, -17, -1, -17, -2, -17, -3, -17,
156  -5, -17, -8, -17, -13, -17, -17, -17, -21, -17,
157  0, -21, 1, -21, 2, -21, 3, -21, 5, -21,
158  8, -21, 13, -21, 21, -21, -1, -21, -2, -21,
159  -3, -21, -5, -21, -8, -21, -13, -21, -17, -21,
160  0, 0, -8, -29, 8, -29, -18, -25, 17, -25,
161  0, -23, -6, -22, 6, -22, -13, -19, 12, -19,
162  0, -18, 25, -18, -25, -17, -5, -17, 5, -17,
163  -10, -15, 10, -15, 0, -14, -4, -13, 4, -13,
164  19, -13, -19, -12, -8, -11, -2, -11, 0, -11,
165  2, -11, 8, -11, -15, -10, -4, -10, 4, -10,
166  15, -10, -6, -9, -1, -9, 1, -9, 6, -9,
167  -29, -8, -11, -8, -8, -8, -3, -8, 3, -8,
168  8, -8, 11, -8, 29, -8, -5, -7, -2, -7,
169  0, -7, 2, -7, 5, -7, -22, -6, -9, -6,
170  -6, -6, -3, -6, -1, -6, 1, -6, 3, -6,
171  6, -6, 9, -6, 22, -6, -17, -5, -7, -5,
172  -4, -5, -2, -5, 0, -5, 2, -5, 4, -5,
173  7, -5, 17, -5, -13, -4, -10, -4, -5, -4,
174  -3, -4, -1, -4, 0, -4, 1, -4, 3, -4,
175  5, -4, 10, -4, 13, -4, -8, -3, -6, -3,
176  -4, -3, -3, -3, -2, -3, -1, -3, 0, -3,
177  1, -3, 2, -3, 4, -3, 6, -3, 8, -3,
178  -11, -2, -7, -2, -5, -2, -3, -2, -2, -2,
179  -1, -2, 0, -2, 1, -2, 2, -2, 3, -2,
180  5, -2, 7, -2, 11, -2, -9, -1, -6, -1,
181  -4, -1, -3, -1, -2, -1, -1, -1, 0, -1,
182  1, -1, 2, -1, 3, -1, 4, -1, 6, -1,
183  9, -1, -31, 0, -23, 0, -18, 0, -14, 0,
184  -11, 0, -7, 0, -5, 0, -4, 0, -3, 0,
185  -2, 0, -1, 0, 0, -31, 1, 0, 2, 0,
186  3, 0, 4, 0, 5, 0, 7, 0, 11, 0,
187  14, 0, 18, 0, 23, 0, 31, 0, -9, 1,
188  -6, 1, -4, 1, -3, 1, -2, 1, -1, 1,
189  0, 1, 1, 1, 2, 1, 3, 1, 4, 1,
190  6, 1, 9, 1, -11, 2, -7, 2, -5, 2,
191  -3, 2, -2, 2, -1, 2, 0, 2, 1, 2,
192  2, 2, 3, 2, 5, 2, 7, 2, 11, 2,
193  -8, 3, -6, 3, -4, 3, -2, 3, -1, 3,
194  0, 3, 1, 3, 2, 3, 3, 3, 4, 3,
195  6, 3, 8, 3, -13, 4, -10, 4, -5, 4,
196  -3, 4, -1, 4, 0, 4, 1, 4, 3, 4,
197  5, 4, 10, 4, 13, 4, -17, 5, -7, 5,
198  -4, 5, -2, 5, 0, 5, 2, 5, 4, 5,
199  7, 5, 17, 5, -22, 6, -9, 6, -6, 6,
200  -3, 6, -1, 6, 1, 6, 3, 6, 6, 6,
201  9, 6, 22, 6, -5, 7, -2, 7, 0, 7,
202  2, 7, 5, 7, -29, 8, -11, 8, -8, 8,
203  -3, 8, 3, 8, 8, 8, 11, 8, 29, 8,
204  -6, 9, -1, 9, 1, 9, 6, 9, -15, 10,
205  -4, 10, 4, 10, 15, 10, -8, 11, -2, 11,
206  0, 11, 2, 11, 8, 11, 19, 12, -19, 13,
207  -4, 13, 4, 13, 0, 14, -10, 15, 10, 15,
208  -5, 17, 5, 17, 25, 17, -25, 18, 0, 18,
209  -12, 19, 13, 19, -6, 22, 6, 22, 0, 23,
210  -17, 25, 18, 25, -8, 29, 8, 29, 0, 31,
211  0, 0, -6, -22, 6, -22, -13, -19, 12, -19,
212  0, -18, -5, -17, 5, -17, -10, -15, 10, -15,
213  0, -14, -4, -13, 4, -13, 19, -13, -19, -12,
214  -8, -11, -2, -11, 0, -11, 2, -11, 8, -11,
215  -15, -10, -4, -10, 4, -10, 15, -10, -6, -9,
216  -1, -9, 1, -9, 6, -9, -11, -8, -8, -8,
217  -3, -8, 0, -8, 3, -8, 8, -8, 11, -8,
218  -5, -7, -2, -7, 0, -7, 2, -7, 5, -7,
219  -22, -6, -9, -6, -6, -6, -3, -6, -1, -6,
220  1, -6, 3, -6, 6, -6, 9, -6, 22, -6,
221  -17, -5, -7, -5, -4, -5, -2, -5, -1, -5,
222  0, -5, 1, -5, 2, -5, 4, -5, 7, -5,
223  17, -5, -13, -4, -10, -4, -5, -4, -3, -4,
224  -2, -4, -1, -4, 0, -4, 1, -4, 2, -4,
225  3, -4, 5, -4, 10, -4, 13, -4, -8, -3,
226  -6, -3, -4, -3, -3, -3, -2, -3, -1, -3,
227  0, -3, 1, -3, 2, -3, 3, -3, 4, -3,
228  6, -3, 8, -3, -11, -2, -7, -2, -5, -2,
229  -4, -2, -3, -2, -2, -2, -1, -2, 0, -2,
230  1, -2, 2, -2, 3, -2, 4, -2, 5, -2,
231  7, -2, 11, -2, -9, -1, -6, -1, -5, -1,
232  -4, -1, -3, -1, -2, -1, -1, -1, 0, -1,
233  1, -1, 2, -1, 3, -1, 4, -1, 5, -1,
234  6, -1, 9, -1, -23, 0, -18, 0, -14, 0,
235  -11, 0, -7, 0, -5, 0, -4, 0, -3, 0,
236  -2, 0, -1, 0, 0, -23, 1, 0, 2, 0,
237  3, 0, 4, 0, 5, 0, 7, 0, 11, 0,
238  14, 0, 18, 0, 23, 0, -9, 1, -6, 1,
239  -5, 1, -4, 1, -3, 1, -2, 1, -1, 1,
240  0, 1, 1, 1, 2, 1, 3, 1, 4, 1,
241  5, 1, 6, 1, 9, 1, -11, 2, -7, 2,
242  -5, 2, -4, 2, -3, 2, -2, 2, -1, 2,
243  0, 2, 1, 2, 2, 2, 3, 2, 4, 2,
244  5, 2, 7, 2, 11, 2, -8, 3, -6, 3,
245  -4, 3, -3, 3, -2, 3, -1, 3, 0, 3,
246  1, 3, 2, 3, 3, 3, 4, 3, 6, 3,
247  8, 3, -13, 4, -10, 4, -5, 4, -3, 4,
248  -2, 4, -1, 4, 0, 4, 1, 4, 2, 4,
249  3, 4, 5, 4, 10, 4, 13, 4, -17, 5,
250  -7, 5, -4, 5, -2, 5, -1, 5, 0, 5,
251  1, 5, 2, 5, 4, 5, 7, 5, 17, 5,
252  -22, 6, -9, 6, -6, 6, -3, 6, -1, 6,
253  1, 6, 3, 6, 6, 6, 9, 6, 22, 6,
254  -5, 7, -2, 7, 0, 7, 2, 7, 5, 7,
255  -11, 8, -8, 8, -3, 8, 0, 8, 3, 8,
256  8, 8, 11, 8, -6, 9, -1, 9, 1, 9,
257  6, 9, -15, 10, -4, 10, 4, 10, 15, 10,
258  -8, 11, -2, 11, 0, 11, 2, 11, 8, 11,
259  19, 12, -19, 13, -4, 13, 4, 13, 0, 14,
260  -10, 15, 10, 15, -5, 17, 5, 17, 0, 18,
261  -12, 19, 13, 19, -6, 22, 6, 22, 0, 23,
262 };
263 
264 typedef struct SANMVideoContext {
265  AVCodecContext *avctx;
266  GetByteContext gb;
267 
268  int version, subversion;
269  uint32_t pal[PALETTE_SIZE];
270  int16_t delta_pal[PALETTE_DELTA];
271 
272  ptrdiff_t pitch;
273  int width, height;
274  int aligned_width, aligned_height;
275  int prev_seq;
276 
277  AVFrame *frame;
278  uint16_t *frm0, *frm1, *frm2;
279  uint8_t *stored_frame;
280  uint32_t frm0_size, frm1_size, frm2_size;
281  uint32_t stored_frame_size;
282 
283  uint8_t *rle_buf;
284  unsigned int rle_buf_size;
285 
286  int rotate_code;
287 
288  long npixels, buf_size;
289 
290  uint16_t codebook[256];
291  uint16_t small_codebook[4];
292 
293  int8_t p4x4glyphs[NGLYPHS][16];
294  int8_t p8x8glyphs[NGLYPHS][64];
295 } SANMVideoContext;
296 
297 typedef struct SANMFrameHeader {
298  int seq_num, codec, rotate_code, rle_output_size;
299 
300  uint16_t bg_color;
301  uint32_t width, height;
302 } SANMFrameHeader;
303 
304 enum GlyphEdge {
305  LEFT_EDGE,
306  TOP_EDGE,
307  RIGHT_EDGE,
308  BOTTOM_EDGE,
309  NO_EDGE
310 };
311 
312 enum GlyphDir {
313  DIR_LEFT,
314  DIR_UP,
315  DIR_RIGHT,
316  DIR_DOWN,
317  NO_DIR
318 };
319 
320 /**
321  * Return enum GlyphEdge of box where point (x, y) lies.
322  *
323  * @param x x point coordinate
324  * @param y y point coordinate
325  * @param edge_size box width/height.
326  */
327 static enum GlyphEdge which_edge(int x, int y, int edge_size)
328 {
329  const int edge_max = edge_size - 1;
330 
331  if (!y)
332  return BOTTOM_EDGE;
333  else if (y == edge_max)
334  return TOP_EDGE;
335  else if (!x)
336  return LEFT_EDGE;
337  else if (x == edge_max)
338  return RIGHT_EDGE;
339  else
340  return NO_EDGE;
341 }
342 
343 static enum GlyphDir which_direction(enum GlyphEdge edge0, enum GlyphEdge edge1)
344 {
345  if ((edge0 == LEFT_EDGE && edge1 == RIGHT_EDGE) ||
346  (edge1 == LEFT_EDGE && edge0 == RIGHT_EDGE) ||
347  (edge0 == BOTTOM_EDGE && edge1 != TOP_EDGE) ||
348  (edge1 == BOTTOM_EDGE && edge0 != TOP_EDGE))
349  return DIR_UP;
350  else if ((edge0 == TOP_EDGE && edge1 != BOTTOM_EDGE) ||
351  (edge1 == TOP_EDGE && edge0 != BOTTOM_EDGE))
352  return DIR_DOWN;
353  else if ((edge0 == LEFT_EDGE && edge1 != RIGHT_EDGE) ||
354  (edge1 == LEFT_EDGE && edge0 != RIGHT_EDGE))
355  return DIR_LEFT;
356  else if ((edge0 == TOP_EDGE && edge1 == BOTTOM_EDGE) ||
357  (edge1 == TOP_EDGE && edge0 == BOTTOM_EDGE) ||
358  (edge0 == RIGHT_EDGE && edge1 != LEFT_EDGE) ||
359  (edge1 == RIGHT_EDGE && edge0 != LEFT_EDGE))
360  return DIR_RIGHT;
361 
362  return NO_DIR;
363 }
364 
365 /* Interpolate two points. */
366 static void interp_point(int8_t *points, int x0, int y0, int x1, int y1,
367  int pos, int npoints)
368 {
369  if (npoints) {
370  points[0] = (x0 * pos + x1 * (npoints - pos) + (npoints >> 1)) / npoints;
371  points[1] = (y0 * pos + y1 * (npoints - pos) + (npoints >> 1)) / npoints;
372  } else {
373  points[0] = x0;
374  points[1] = y0;
375  }
376 }
377 
378 /**
379  * Construct glyphs by iterating through vector coordinates.
380  *
381  * @param pglyphs pointer to table where glyphs are stored
382  * @param xvec pointer to x component of vector coordinates
383  * @param yvec pointer to y component of vector coordinates
384  * @param side_length glyph width/height.
385  */
386 static void make_glyphs(int8_t *pglyphs, const int8_t *xvec, const int8_t *yvec,
387  const int side_length)
388 {
389  const int glyph_size = side_length * side_length;
390  int8_t *pglyph = pglyphs;
391 
392  int i, j;
393  for (i = 0; i < GLYPH_COORD_VECT_SIZE; i++) {
394  int x0 = xvec[i];
395  int y0 = yvec[i];
396  enum GlyphEdge edge0 = which_edge(x0, y0, side_length);
397 
398  for (j = 0; j < GLYPH_COORD_VECT_SIZE; j++, pglyph += glyph_size) {
399  int x1 = xvec[j];
400  int y1 = yvec[j];
401  enum GlyphEdge edge1 = which_edge(x1, y1, side_length);
402  enum GlyphDir dir = which_direction(edge0, edge1);
403  int npoints = FFMAX(FFABS(x1 - x0), FFABS(y1 - y0));
404  int ipoint;
405 
406  for (ipoint = 0; ipoint <= npoints; ipoint++) {
407  int8_t point[2];
408  int irow, icol;
409 
410  interp_point(point, x0, y0, x1, y1, ipoint, npoints);
411 
412  switch (dir) {
413  case DIR_UP:
414  for (irow = point[1]; irow >= 0; irow--)
415  pglyph[point[0] + irow * side_length] = 1;
416  break;
417 
418  case DIR_DOWN:
419  for (irow = point[1]; irow < side_length; irow++)
420  pglyph[point[0] + irow * side_length] = 1;
421  break;
422 
423  case DIR_LEFT:
424  for (icol = point[0]; icol >= 0; icol--)
425  pglyph[icol + point[1] * side_length] = 1;
426  break;
427 
428  case DIR_RIGHT:
429  for (icol = point[0]; icol < side_length; icol++)
430  pglyph[icol + point[1] * side_length] = 1;
431  break;
432  }
433  }
434  }
435  }
436 }
437 
438 static void init_sizes(SANMVideoContext *ctx, int width, int height)
439 {
440  ctx->width = width;
441  ctx->height = height;
442  ctx->npixels = width * height;
443 
444  ctx->aligned_width = FFALIGN(width, 8);
445  ctx->aligned_height = FFALIGN(height, 8);
446 
447  ctx->buf_size = ctx->aligned_width * ctx->aligned_height * sizeof(ctx->frm0[0]);
448  ctx->pitch = width;
449 }
450 
451 static void destroy_buffers(SANMVideoContext *ctx)
452 {
453  av_freep(&ctx->frm0);
454  av_freep(&ctx->frm1);
455  av_freep(&ctx->frm2);
456  av_freep(&ctx->stored_frame);
457  av_freep(&ctx->rle_buf);
458  ctx->frm0_size =
459  ctx->frm1_size =
460  ctx->frm2_size = 0;
461  init_sizes(ctx, 0, 0);
462 }
463 
464 static av_cold int init_buffers(SANMVideoContext *ctx)
465 {
466  av_fast_padded_mallocz(&ctx->frm0, &ctx->frm0_size, ctx->buf_size);
467  av_fast_padded_mallocz(&ctx->frm1, &ctx->frm1_size, ctx->buf_size);
468  av_fast_padded_mallocz(&ctx->frm2, &ctx->frm2_size, ctx->buf_size);
469  if (!ctx->version)
470  av_fast_padded_mallocz(&ctx->stored_frame,
471  &ctx->stored_frame_size, ctx->buf_size);
472 
473  if (!ctx->frm0 || !ctx->frm1 || !ctx->frm2 ||
474  (!ctx->stored_frame && !ctx->version)) {
475  destroy_buffers(ctx);
476  return AVERROR(ENOMEM);
477  }
478 
479  return 0;
480 }
481 
482 static void rotate_bufs(SANMVideoContext *ctx, int rotate_code)
483 {
484  if (rotate_code == 2)
485  FFSWAP(uint16_t*, ctx->frm1, ctx->frm2);
486  FFSWAP(uint16_t*, ctx->frm2, ctx->frm0);
487 }
488 
489 static av_cold int decode_init(AVCodecContext *avctx)
490 {
491  SANMVideoContext *ctx = avctx->priv_data;
492 
493  ctx->avctx = avctx;
494  ctx->version = !avctx->extradata_size;
495  // early sanity check before allocations to avoid need for deallocation code.
496  if (!ctx->version && avctx->extradata_size < 1026) {
497  av_log(avctx, AV_LOG_ERROR, "Not enough extradata.\n");
498  return AVERROR_INVALIDDATA;
499  }
500 
501  avctx->pix_fmt = ctx->version ? AV_PIX_FMT_RGB565 : AV_PIX_FMT_PAL8;
502 
503  init_sizes(ctx, avctx->width, avctx->height);
504  if (init_buffers(ctx)) {
505  av_log(avctx, AV_LOG_ERROR, "Error allocating buffers.\n");
506  return AVERROR(ENOMEM);
507  }
508 
509  make_glyphs(ctx->p4x4glyphs[0], glyph4_x, glyph4_y, 4);
510  make_glyphs(ctx->p8x8glyphs[0], glyph8_x, glyph8_y, 8);
511 
512  if (!ctx->version) {
513  int i;
514 
515  ctx->subversion = AV_RL16(avctx->extradata);
516  for (i = 0; i < PALETTE_SIZE; i++)
517  ctx->pal[i] = 0xFFU << 24 | AV_RL32(avctx->extradata + 2 + i * 4);
518  }
519 
520  return 0;
521 }
522 
523 static av_cold int decode_end(AVCodecContext *avctx)
524 {
525  SANMVideoContext *ctx = avctx->priv_data;
526 
527  destroy_buffers(ctx);
528 
529  return 0;
530 }
531 
532 static int rle_decode(SANMVideoContext *ctx, uint8_t *dst, const int out_size)
533 {
534  int opcode, color, run_len, left = out_size;
535 
536  while (left > 0) {
537  opcode = bytestream2_get_byte(&ctx->gb);
538  run_len = (opcode >> 1) + 1;
539  if (run_len > left || bytestream2_get_bytes_left(&ctx->gb) <= 0)
540  return AVERROR_INVALIDDATA;
541 
542  if (opcode & 1) {
543  color = bytestream2_get_byte(&ctx->gb);
544  memset(dst, color, run_len);
545  } else {
546  if (bytestream2_get_bytes_left(&ctx->gb) < run_len)
547  return AVERROR_INVALIDDATA;
548  bytestream2_get_bufferu(&ctx->gb, dst, run_len);
549  }
550 
551  dst += run_len;
552  left -= run_len;
553  }
554 
555  return 0;
556 }
557 
558 static int old_codec1(SANMVideoContext *ctx, int top,
559  int left, int width, int height)
560 {
561  uint8_t *dst = ((uint8_t *)ctx->frm0) + left + top * ctx->pitch;
562  int i, j, len, flag, code, val, pos, end;
563 
564  for (i = 0; i < height; i++) {
565  pos = 0;
566 
567  if (bytestream2_get_bytes_left(&ctx->gb) < 2)
568  return AVERROR_INVALIDDATA;
569 
570  len = bytestream2_get_le16u(&ctx->gb);
571  end = bytestream2_tell(&ctx->gb) + len;
572 
573  while (bytestream2_tell(&ctx->gb) < end) {
574  if (bytestream2_get_bytes_left(&ctx->gb) < 2)
575  return AVERROR_INVALIDDATA;
576 
577  code = bytestream2_get_byteu(&ctx->gb);
578  flag = code & 1;
579  code = (code >> 1) + 1;
580  if (pos + code > width)
581  return AVERROR_INVALIDDATA;
582  if (flag) {
583  val = bytestream2_get_byteu(&ctx->gb);
584  if (val)
585  memset(dst + pos, val, code);
586  pos += code;
587  } else {
588  if (bytestream2_get_bytes_left(&ctx->gb) < code)
589  return AVERROR_INVALIDDATA;
590  for (j = 0; j < code; j++) {
591  val = bytestream2_get_byteu(&ctx->gb);
592  if (val)
593  dst[pos] = val;
594  pos++;
595  }
596  }
597  }
598  dst += ctx->pitch;
599  }
600  ctx->rotate_code = 0;
601 
602  return 0;
603 }
604 
605 static inline void codec37_mv(uint8_t *dst, const uint8_t *src,
606  int height, int stride, int x, int y)
607 {
608  int pos, i, j;
609 
610  pos = x + y * stride;
611  for (j = 0; j < 4; j++) {
612  for (i = 0; i < 4; i++) {
613  if ((pos + i) < 0 || (pos + i) >= height * stride)
614  dst[i] = 0;
615  else
616  dst[i] = src[i];
617  }
618  dst += stride;
619  src += stride;
620  pos += stride;
621  }
622 }
623 
624 static int old_codec37(SANMVideoContext *ctx, int top,
625  int left, int width, int height)
626 {
627  ptrdiff_t stride = ctx->pitch;
628  int i, j, k, t;
629  uint8_t *dst, *prev;
630  int skip_run = 0;
631  int compr = bytestream2_get_byte(&ctx->gb);
632  int mvoff = bytestream2_get_byte(&ctx->gb);
633  int seq = bytestream2_get_le16(&ctx->gb);
634  uint32_t decoded_size = bytestream2_get_le32(&ctx->gb);
635  int flags;
636 
637  bytestream2_skip(&ctx->gb, 4);
638  flags = bytestream2_get_byte(&ctx->gb);
639  bytestream2_skip(&ctx->gb, 3);
640 
641  if (decoded_size > ctx->height * stride - left - top * stride) {
642  decoded_size = ctx->height * stride - left - top * stride;
643  av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");
644  }
645 
646  ctx->rotate_code = 0;
647 
648  if (((seq & 1) || !(flags & 1)) && (compr && compr != 2))
649  rotate_bufs(ctx, 1);
650 
651  dst = ((uint8_t*)ctx->frm0) + left + top * stride;
652  prev = ((uint8_t*)ctx->frm2) + left + top * stride;
653 
654  if (mvoff > 2) {
655  av_log(ctx->avctx, AV_LOG_ERROR, "Invalid motion base value %d.\n", mvoff);
656  return AVERROR_INVALIDDATA;
657  }
658 
659  switch (compr) {
660  case 0:
661  for (i = 0; i < height; i++) {
662  bytestream2_get_buffer(&ctx->gb, dst, width);
663  dst += stride;
664  }
665  memset(ctx->frm1, 0, ctx->height * stride);
666  memset(ctx->frm2, 0, ctx->height * stride);
667  break;
668  case 2:
669  if (rle_decode(ctx, dst, decoded_size))
670  return AVERROR_INVALIDDATA;
671  memset(ctx->frm1, 0, ctx->frm1_size);
672  memset(ctx->frm2, 0, ctx->frm2_size);
673  break;
674  case 3:
675  case 4:
676  if (flags & 4) {
677  for (j = 0; j < height; j += 4) {
678  for (i = 0; i < width; i += 4) {
679  int code;
680  if (skip_run) {
681  skip_run--;
682  copy_block4(dst + i, prev + i, stride, stride, 4);
683  continue;
684  }
685  if (bytestream2_get_bytes_left(&ctx->gb) < 1)
686  return AVERROR_INVALIDDATA;
687  code = bytestream2_get_byteu(&ctx->gb);
688  switch (code) {
689  case 0xFF:
690  if (bytestream2_get_bytes_left(&ctx->gb) < 16)
691  return AVERROR_INVALIDDATA;
692  for (k = 0; k < 4; k++)
693  bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
694  break;
695  case 0xFE:
696  if (bytestream2_get_bytes_left(&ctx->gb) < 4)
697  return AVERROR_INVALIDDATA;
698  for (k = 0; k < 4; k++)
699  memset(dst + i + k * stride, bytestream2_get_byteu(&ctx->gb), 4);
700  break;
701  case 0xFD:
702  if (bytestream2_get_bytes_left(&ctx->gb) < 1)
703  return AVERROR_INVALIDDATA;
704  t = bytestream2_get_byteu(&ctx->gb);
705  for (k = 0; k < 4; k++)
706  memset(dst + i + k * stride, t, 4);
707  break;
708  default:
709  if (compr == 4 && !code) {
710  if (bytestream2_get_bytes_left(&ctx->gb) < 1)
711  return AVERROR_INVALIDDATA;
712  skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
713  i -= 4;
714  } else {
715  int mx, my;
716 
717  mx = c37_mv[(mvoff * 255 + code) * 2];
718  my = c37_mv[(mvoff * 255 + code) * 2 + 1];
719  codec37_mv(dst + i, prev + i + mx + my * stride,
720  ctx->height, stride, i + mx, j + my);
721  }
722  }
723  }
724  dst += stride * 4;
725  prev += stride * 4;
726  }
727  } else {
728  for (j = 0; j < height; j += 4) {
729  for (i = 0; i < width; i += 4) {
730  int code;
731  if (skip_run) {
732  skip_run--;
733  copy_block4(dst + i, prev + i, stride, stride, 4);
734  continue;
735  }
736  code = bytestream2_get_byte(&ctx->gb);
737  if (code == 0xFF) {
738  if (bytestream2_get_bytes_left(&ctx->gb) < 16)
739  return AVERROR_INVALIDDATA;
740  for (k = 0; k < 4; k++)
741  bytestream2_get_bufferu(&ctx->gb, dst + i + k * stride, 4);
742  } else if (compr == 4 && !code) {
743  if (bytestream2_get_bytes_left(&ctx->gb) < 1)
744  return AVERROR_INVALIDDATA;
745  skip_run = bytestream2_get_byteu(&ctx->gb) + 1;
746  i -= 4;
747  } else {
748  int mx, my;
749 
750  mx = c37_mv[(mvoff * 255 + code) * 2];
751  my = c37_mv[(mvoff * 255 + code) * 2 + 1];
752  codec37_mv(dst + i, prev + i + mx + my * stride,
753  ctx->height, stride, i + mx, j + my);
754  }
755  }
756  dst += stride * 4;
757  prev += stride * 4;
758  }
759  }
760  break;
761  default:
762  avpriv_report_missing_feature(ctx->avctx,
763  "Subcodec 37 compression %d", compr);
764  return AVERROR_PATCHWELCOME;
765  }
766 
767  return 0;
768 }
769 
770 static int process_block(SANMVideoContext *ctx, uint8_t *dst, uint8_t *prev1,
771  uint8_t *prev2, int stride, int tbl, int size)
772 {
773  int code, k, t;
774  uint8_t colors[2];
775  int8_t *pglyph;
776 
777  if (bytestream2_get_bytes_left(&ctx->gb) < 1)
778  return AVERROR_INVALIDDATA;
779 
780  code = bytestream2_get_byteu(&ctx->gb);
781  if (code >= 0xF8) {
782  switch (code) {
783  case 0xFF:
784  if (size == 2) {
785  if (bytestream2_get_bytes_left(&ctx->gb) < 4)
786  return AVERROR_INVALIDDATA;
787  dst[0] = bytestream2_get_byteu(&ctx->gb);
788  dst[1] = bytestream2_get_byteu(&ctx->gb);
789  dst[0 + stride] = bytestream2_get_byteu(&ctx->gb);
790  dst[1 + stride] = bytestream2_get_byteu(&ctx->gb);
791  } else {
792  size >>= 1;
793  if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
794  return AVERROR_INVALIDDATA;
795  if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
796  stride, tbl, size))
797  return AVERROR_INVALIDDATA;
798  dst += size * stride;
799  prev1 += size * stride;
800  prev2 += size * stride;
801  if (process_block(ctx, dst, prev1, prev2, stride, tbl, size))
802  return AVERROR_INVALIDDATA;
803  if (process_block(ctx, dst + size, prev1 + size, prev2 + size,
804  stride, tbl, size))
805  return AVERROR_INVALIDDATA;
806  }
807  break;
808  case 0xFE:
809  if (bytestream2_get_bytes_left(&ctx->gb) < 1)
810  return AVERROR_INVALIDDATA;
811 
812  t = bytestream2_get_byteu(&ctx->gb);
813  for (k = 0; k < size; k++)
814  memset(dst + k * stride, t, size);
815  break;
816  case 0xFD:
817  if (bytestream2_get_bytes_left(&ctx->gb) < 3)
818  return AVERROR_INVALIDDATA;
819 
820  code = bytestream2_get_byteu(&ctx->gb);
821  pglyph = (size == 8) ? ctx->p8x8glyphs[code] : ctx->p4x4glyphs[code];
822  bytestream2_get_bufferu(&ctx->gb, colors, 2);
823 
824  for (k = 0; k < size; k++)
825  for (t = 0; t < size; t++)
826  dst[t + k * stride] = colors[!*pglyph++];
827  break;
828  case 0xFC:
829  for (k = 0; k < size; k++)
830  memcpy(dst + k * stride, prev1 + k * stride, size);
831  break;
832  default:
833  k = bytestream2_tell(&ctx->gb);
834  bytestream2_seek(&ctx->gb, tbl + (code & 7), SEEK_SET);
835  t = bytestream2_get_byte(&ctx->gb);
836  bytestream2_seek(&ctx->gb, k, SEEK_SET);
837  for (k = 0; k < size; k++)
838  memset(dst + k * stride, t, size);
839  }
840  } else {
841  int mx = motion_vectors[code][0];
842  int my = motion_vectors[code][1];
843  int index = prev2 - (const uint8_t *)ctx->frm2;
844 
845  av_assert2(index >= 0 && index < (ctx->buf_size >> 1));
846 
847  if (index < -mx - my * stride ||
848  (ctx->buf_size >> 1) - index < mx + size + (my + size - 1) * stride) {
849  av_log(ctx->avctx, AV_LOG_ERROR, "MV is invalid.\n");
850  return AVERROR_INVALIDDATA;
851  }
852 
853  for (k = 0; k < size; k++)
854  memcpy(dst + k * stride, prev2 + mx + (my + k) * stride, size);
855  }
856 
857  return 0;
858 }
859 
860 static int old_codec47(SANMVideoContext *ctx, int top,
861  int left, int width, int height)
862 {
863  uint32_t decoded_size;
864  int i, j;
865  ptrdiff_t stride = ctx->pitch;
866  uint8_t *dst = (uint8_t *)ctx->frm0 + left + top * stride;
867  uint8_t *prev1 = (uint8_t *)ctx->frm1;
868  uint8_t *prev2 = (uint8_t *)ctx->frm2;
869  int tbl_pos = bytestream2_tell(&ctx->gb);
870  int seq = bytestream2_get_le16(&ctx->gb);
871  int compr = bytestream2_get_byte(&ctx->gb);
872  int new_rot = bytestream2_get_byte(&ctx->gb);
873  int skip = bytestream2_get_byte(&ctx->gb);
874 
875  bytestream2_skip(&ctx->gb, 9);
876  decoded_size = bytestream2_get_le32(&ctx->gb);
877  bytestream2_skip(&ctx->gb, 8);
878 
879  if (decoded_size > ctx->height * stride - left - top * stride) {
880  decoded_size = ctx->height * stride - left - top * stride;
881  av_log(ctx->avctx, AV_LOG_WARNING, "Decoded size is too large.\n");
882  }
883 
884  if (skip & 1)
885  bytestream2_skip(&ctx->gb, 0x8080);
886  if (!seq) {
887  ctx->prev_seq = -1;
888  memset(prev1, 0, ctx->height * stride);
889  memset(prev2, 0, ctx->height * stride);
890  }
891 
892  switch (compr) {
893  case 0:
894  if (bytestream2_get_bytes_left(&ctx->gb) < width * height)
895  return AVERROR_INVALIDDATA;
896  for (j = 0; j < height; j++) {
897  bytestream2_get_bufferu(&ctx->gb, dst, width);
898  dst += stride;
899  }
900  break;
901  case 1:
902  if (bytestream2_get_bytes_left(&ctx->gb) < ((width + 1) >> 1) * ((height + 1) >> 1))
903  return AVERROR_INVALIDDATA;
904  for (j = 0; j < height; j += 2) {
905  for (i = 0; i < width; i += 2) {
906  dst[i] =
907  dst[i + 1] =
908  dst[stride + i] =
909  dst[stride + i + 1] = bytestream2_get_byteu(&ctx->gb);
910  }
911  dst += stride * 2;
912  }
913  break;
914  case 2:
915  if (seq == ctx->prev_seq + 1) {
916  for (j = 0; j < height; j += 8) {
917  for (i = 0; i < width; i += 8)
918  if (process_block(ctx, dst + i, prev1 + i, prev2 + i, stride,
919  tbl_pos + 8, 8))
920  return AVERROR_INVALIDDATA;
921  dst += stride * 8;
922  prev1 += stride * 8;
923  prev2 += stride * 8;
924  }
925  }
926  break;
927  case 3:
928  memcpy(ctx->frm0, ctx->frm2, ctx->pitch * ctx->height);
929  break;
930  case 4:
931  memcpy(ctx->frm0, ctx->frm1, ctx->pitch * ctx->height);
932  break;
933  case 5:
934  if (rle_decode(ctx, dst, decoded_size))
935  return AVERROR_INVALIDDATA;
936  break;
937  default:
938  avpriv_report_missing_feature(ctx->avctx,
939  "Subcodec 47 compression %d", compr);
940  return AVERROR_PATCHWELCOME;
941  }
942  if (seq == ctx->prev_seq + 1)
943  ctx->rotate_code = new_rot;
944  else
945  ctx->rotate_code = 0;
946  ctx->prev_seq = seq;
947 
948  return 0;
949 }
950 
951 static int process_frame_obj(SANMVideoContext *ctx)
952 {
953  uint16_t codec = bytestream2_get_le16u(&ctx->gb);
954  uint16_t left = bytestream2_get_le16u(&ctx->gb);
955  uint16_t top = bytestream2_get_le16u(&ctx->gb);
956  uint16_t w = bytestream2_get_le16u(&ctx->gb);
957  uint16_t h = bytestream2_get_le16u(&ctx->gb);
958 
959  if (!w || !h) {
960  av_log(ctx->avctx, AV_LOG_ERROR, "Dimensions are invalid.\n");
961  return AVERROR_INVALIDDATA;
962  }
963 
964  if (ctx->width < left + w || ctx->height < top + h) {
965  int ret = ff_set_dimensions(ctx->avctx, FFMAX(left + w, ctx->width),
966  FFMAX(top + h, ctx->height));
967  if (ret < 0)
968  return ret;
969  init_sizes(ctx, FFMAX(left + w, ctx->width),
970  FFMAX(top + h, ctx->height));
971  if (init_buffers(ctx)) {
972  av_log(ctx->avctx, AV_LOG_ERROR, "Error resizing buffers.\n");
973  return AVERROR(ENOMEM);
974  }
975  }
976  bytestream2_skip(&ctx->gb, 4);
977 
978  switch (codec) {
979  case 1:
980  case 3:
981  return old_codec1(ctx, top, left, w, h);
982  case 37:
983  return old_codec37(ctx, top, left, w, h);
984  case 47:
985  return old_codec47(ctx, top, left, w, h);
986  default:
987  avpriv_request_sample(ctx->avctx, "Subcodec %d", codec);
988  return AVERROR_PATCHWELCOME;
989  }
990 }
991 
992 static int decode_0(SANMVideoContext *ctx)
993 {
994  uint16_t *frm = ctx->frm0;
995  int x, y;
996 
997  if (bytestream2_get_bytes_left(&ctx->gb) < ctx->width * ctx->height * 2) {
998  av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for raw frame.\n");
999  return AVERROR_INVALIDDATA;
1000  }
1001  for (y = 0; y < ctx->height; y++) {
1002  for (x = 0; x < ctx->width; x++)
1003  frm[x] = bytestream2_get_le16u(&ctx->gb);
1004  frm += ctx->pitch;
1005  }
1006  return 0;
1007 }
1008 
1009 static int decode_nop(SANMVideoContext *ctx)
1010 {
1011  avpriv_request_sample(ctx->avctx, "Unknown/unsupported compression type");
1012  return AVERROR_PATCHWELCOME;
1013 }
1014 
1015 static void copy_block(uint16_t *pdest, uint16_t *psrc, int block_size, ptrdiff_t pitch)
1016 {
1017  uint8_t *dst = (uint8_t *)pdest;
1018  uint8_t *src = (uint8_t *)psrc;
1019  ptrdiff_t stride = pitch * 2;
1020 
1021  switch (block_size) {
1022  case 2:
1023  copy_block4(dst, src, stride, stride, 2);
1024  break;
1025  case 4:
1026  copy_block8(dst, src, stride, stride, 4);
1027  break;
1028  case 8:
1029  copy_block16(dst, src, stride, stride, 8);
1030  break;
1031  }
1032 }
1033 
1034 static void fill_block(uint16_t *pdest, uint16_t color, int block_size, ptrdiff_t pitch)
1035 {
1036  int x, y;
1037 
1038  pitch -= block_size;
1039  for (y = 0; y < block_size; y++, pdest += pitch)
1040  for (x = 0; x < block_size; x++)
1041  *pdest++ = color;
1042 }
1043 
1044 static int draw_glyph(SANMVideoContext *ctx, uint16_t *dst, int index,
1045  uint16_t fg_color, uint16_t bg_color, int block_size,
1046  ptrdiff_t pitch)
1047 {
1048  int8_t *pglyph;
1049  uint16_t colors[2] = { fg_color, bg_color };
1050  int x, y;
1051 
1052  if (index >= NGLYPHS) {
1053  av_log(ctx->avctx, AV_LOG_ERROR, "Ignoring nonexistent glyph #%u.\n", index);
1054  return AVERROR_INVALIDDATA;
1055  }
1056 
1057  pglyph = block_size == 8 ? ctx->p8x8glyphs[index] : ctx->p4x4glyphs[index];
1058  pitch -= block_size;
1059 
1060  for (y = 0; y < block_size; y++, dst += pitch)
1061  for (x = 0; x < block_size; x++)
1062  *dst++ = colors[*pglyph++];
1063  return 0;
1064 }
1065 
1066 static int opcode_0xf7(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)
1067 {
1068  uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
1069 
1070  if (block_size == 2) {
1071  uint32_t indices;
1072 
1073  if (bytestream2_get_bytes_left(&ctx->gb) < 4)
1074  return AVERROR_INVALIDDATA;
1075 
1076  indices = bytestream2_get_le32u(&ctx->gb);
1077  dst[0] = ctx->codebook[indices & 0xFF];
1078  indices >>= 8;
1079  dst[1] = ctx->codebook[indices & 0xFF];
1080  indices >>= 8;
1081  dst[pitch] = ctx->codebook[indices & 0xFF];
1082  indices >>= 8;
1083  dst[pitch + 1] = ctx->codebook[indices & 0xFF];
1084  } else {
1085  uint16_t fgcolor, bgcolor;
1086  int glyph;
1087 
1088  if (bytestream2_get_bytes_left(&ctx->gb) < 3)
1089  return AVERROR_INVALIDDATA;
1090 
1091  glyph = bytestream2_get_byteu(&ctx->gb);
1092  bgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
1093  fgcolor = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
1094 
1095  draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
1096  }
1097  return 0;
1098 }
1099 
1100 static int opcode_0xf8(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)
1101 {
1102  uint16_t *dst = ctx->frm0 + cx + cy * ctx->pitch;
1103 
1104  if (block_size == 2) {
1105  if (bytestream2_get_bytes_left(&ctx->gb) < 8)
1106  return AVERROR_INVALIDDATA;
1107 
1108  dst[0] = bytestream2_get_le16u(&ctx->gb);
1109  dst[1] = bytestream2_get_le16u(&ctx->gb);
1110  dst[pitch] = bytestream2_get_le16u(&ctx->gb);
1111  dst[pitch + 1] = bytestream2_get_le16u(&ctx->gb);
1112  } else {
1113  uint16_t fgcolor, bgcolor;
1114  int glyph;
1115 
1116  if (bytestream2_get_bytes_left(&ctx->gb) < 5)
1117  return AVERROR_INVALIDDATA;
1118 
1119  glyph = bytestream2_get_byteu(&ctx->gb);
1120  bgcolor = bytestream2_get_le16u(&ctx->gb);
1121  fgcolor = bytestream2_get_le16u(&ctx->gb);
1122 
1123  draw_glyph(ctx, dst, glyph, fgcolor, bgcolor, block_size, pitch);
1124  }
1125  return 0;
1126 }
1127 
1128 static int good_mvec(SANMVideoContext *ctx, int cx, int cy, int mx, int my,
1129  int block_size)
1130 {
1131  int start_pos = cx + mx + (cy + my) * ctx->pitch;
1132  int end_pos = start_pos + (block_size - 1) * (ctx->pitch + 1);
1133 
1134  int good = start_pos >= 0 && end_pos < (ctx->buf_size >> 1);
1135 
1136  if (!good)
1137  av_log(ctx->avctx, AV_LOG_ERROR,
1138  "Ignoring invalid motion vector (%i, %i)->(%u, %u), block size = %u\n",
1139  cx + mx, cy + my, cx, cy, block_size);
1140 
1141  return good;
1142 }
1143 
1144 static int codec2subblock(SANMVideoContext *ctx, int cx, int cy, int blk_size)
1145 {
1146  int16_t mx, my, index;
1147  int opcode;
1148 
1149  if (bytestream2_get_bytes_left(&ctx->gb) < 1)
1150  return AVERROR_INVALIDDATA;
1151 
1152  opcode = bytestream2_get_byteu(&ctx->gb);
1153 
1154  switch (opcode) {
1155  default:
1156  mx = motion_vectors[opcode][0];
1157  my = motion_vectors[opcode][1];
1158 
1159  if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
1160  copy_block(ctx->frm0 + cx + ctx->pitch * cy,
1161  ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
1162  blk_size, ctx->pitch);
1163  }
1164  break;
1165  case 0xF5:
1166  if (bytestream2_get_bytes_left(&ctx->gb) < 2)
1167  return AVERROR_INVALIDDATA;
1168  index = bytestream2_get_le16u(&ctx->gb);
1169 
1170  mx = index % ctx->width;
1171  my = index / ctx->width;
1172 
1173  if (good_mvec(ctx, cx, cy, mx, my, blk_size)) {
1174  copy_block(ctx->frm0 + cx + ctx->pitch * cy,
1175  ctx->frm2 + cx + mx + ctx->pitch * (cy + my),
1176  blk_size, ctx->pitch);
1177  }
1178  break;
1179  case 0xF6:
1180  copy_block(ctx->frm0 + cx + ctx->pitch * cy,
1181  ctx->frm1 + cx + ctx->pitch * cy,
1182  blk_size, ctx->pitch);
1183  break;
1184  case 0xF7:
1185  opcode_0xf7(ctx, cx, cy, blk_size, ctx->pitch);
1186  break;
1187 
1188  case 0xF8:
1189  opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
1190  break;
1191  case 0xF9:
1192  case 0xFA:
1193  case 0xFB:
1194  case 0xFC:
1195  fill_block(ctx->frm0 + cx + cy * ctx->pitch,
1196  ctx->small_codebook[opcode - 0xf9], blk_size, ctx->pitch);
1197  break;
1198  case 0xFD:
1199  if (bytestream2_get_bytes_left(&ctx->gb) < 1)
1200  return AVERROR_INVALIDDATA;
1201  fill_block(ctx->frm0 + cx + cy * ctx->pitch,
1202  ctx->codebook[bytestream2_get_byteu(&ctx->gb)], blk_size, ctx->pitch);
1203  break;
1204  case 0xFE:
1205  if (bytestream2_get_bytes_left(&ctx->gb) < 2)
1206  return AVERROR_INVALIDDATA;
1207  fill_block(ctx->frm0 + cx + cy * ctx->pitch,
1208  bytestream2_get_le16u(&ctx->gb), blk_size, ctx->pitch);
1209  break;
1210  case 0xFF:
1211  if (blk_size == 2) {
1212  opcode_0xf8(ctx, cx, cy, blk_size, ctx->pitch);
1213  } else {
1214  blk_size >>= 1;
1215  if (codec2subblock(ctx, cx, cy, blk_size))
1216  return AVERROR_INVALIDDATA;
1217  if (codec2subblock(ctx, cx + blk_size, cy, blk_size))
1218  return AVERROR_INVALIDDATA;
1219  if (codec2subblock(ctx, cx, cy + blk_size, blk_size))
1220  return AVERROR_INVALIDDATA;
1221  if (codec2subblock(ctx, cx + blk_size, cy + blk_size, blk_size))
1222  return AVERROR_INVALIDDATA;
1223  }
1224  break;
1225  }
1226  return 0;
1227 }
1228 
1229 static int decode_2(SANMVideoContext *ctx)
1230 {
1231  int cx, cy, ret;
1232 
1233  for (cy = 0; cy < ctx->aligned_height; cy += 8)
1234  for (cx = 0; cx < ctx->aligned_width; cx += 8)
1235  if (ret = codec2subblock(ctx, cx, cy, 8))
1236  return ret;
1237 
1238  return 0;
1239 }
1240 
1241 static int decode_3(SANMVideoContext *ctx)
1242 {
1243  memcpy(ctx->frm0, ctx->frm2, ctx->frm2_size);
1244  return 0;
1245 }
1246 
1247 static int decode_4(SANMVideoContext *ctx)
1248 {
1249  memcpy(ctx->frm0, ctx->frm1, ctx->frm1_size);
1250  return 0;
1251 }
1252 
1253 static int decode_5(SANMVideoContext *ctx)
1254 {
1255 #if HAVE_BIGENDIAN
1256  uint16_t *frm;
1257  int npixels;
1258 #endif
1259  uint8_t *dst = (uint8_t*)ctx->frm0;
1260 
1261  if (rle_decode(ctx, dst, ctx->buf_size))
1262  return AVERROR_INVALIDDATA;
1263 
1264 #if HAVE_BIGENDIAN
1265  npixels = ctx->npixels;
1266  frm = ctx->frm0;
1267  while (npixels--) {
1268  *frm = av_bswap16(*frm);
1269  frm++;
1270  }
1271 #endif
1272 
1273  return 0;
1274 }
1275 
1276 static int decode_6(SANMVideoContext *ctx)
1277 {
1278  int npixels = ctx->npixels;
1279  uint16_t *frm = ctx->frm0;
1280 
1281  if (bytestream2_get_bytes_left(&ctx->gb) < npixels) {
1282  av_log(ctx->avctx, AV_LOG_ERROR, "Insufficient data for frame.\n");
1283  return AVERROR_INVALIDDATA;
1284  }
1285  while (npixels--)
1286  *frm++ = ctx->codebook[bytestream2_get_byteu(&ctx->gb)];
1287 
1288  return 0;
1289 }
1290 
1291 static int decode_8(SANMVideoContext *ctx)
1292 {
1293  uint16_t *pdest = ctx->frm0;
1294  uint8_t *rsrc;
1295  long npixels = ctx->npixels;
1296 
1297  av_fast_malloc(&ctx->rle_buf, &ctx->rle_buf_size, npixels);
1298  if (!ctx->rle_buf) {
1299  av_log(ctx->avctx, AV_LOG_ERROR, "RLE buffer allocation failed.\n");
1300  return AVERROR(ENOMEM);
1301  }
1302  rsrc = ctx->rle_buf;
1303 
1304  if (rle_decode(ctx, rsrc, npixels))
1305  return AVERROR_INVALIDDATA;
1306 
1307  while (npixels--)
1308  *pdest++ = ctx->codebook[*rsrc++];
1309 
1310  return 0;
1311 }
1312 
1313 typedef int (*frm_decoder)(SANMVideoContext *ctx);
1314 
1315 static const frm_decoder v1_decoders[] = {
1316  decode_0, decode_nop, decode_2, decode_3, decode_4, decode_5,
1317  decode_6, decode_nop, decode_8
1318 };
1319 
1320 static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)
1321 {
1322  int i, ret;
1323 
1324  if ((ret = bytestream2_get_bytes_left(&ctx->gb)) < 560) {
1325  av_log(ctx->avctx, AV_LOG_ERROR, "Input frame too short (%d bytes).\n",
1326  ret);
1327  return AVERROR_INVALIDDATA;
1328  }
1329  bytestream2_skip(&ctx->gb, 8); // skip pad
1330 
1331  hdr->width = bytestream2_get_le32u(&ctx->gb);
1332  hdr->height = bytestream2_get_le32u(&ctx->gb);
1333 
1334  if (hdr->width != ctx->width || hdr->height != ctx->height) {
1335  avpriv_report_missing_feature(ctx->avctx, "Variable size frames");
1336  return AVERROR_PATCHWELCOME;
1337  }
1338 
1339  hdr->seq_num = bytestream2_get_le16u(&ctx->gb);
1340  hdr->codec = bytestream2_get_byteu(&ctx->gb);
1341  hdr->rotate_code = bytestream2_get_byteu(&ctx->gb);
1342 
1343  bytestream2_skip(&ctx->gb, 4); // skip pad
1344 
1345  for (i = 0; i < 4; i++)
1346  ctx->small_codebook[i] = bytestream2_get_le16u(&ctx->gb);
1347  hdr->bg_color = bytestream2_get_le16u(&ctx->gb);
1348 
1349  bytestream2_skip(&ctx->gb, 2); // skip pad
1350 
1351  hdr->rle_output_size = bytestream2_get_le32u(&ctx->gb);
1352  for (i = 0; i < 256; i++)
1353  ctx->codebook[i] = bytestream2_get_le16u(&ctx->gb);
1354 
1355  bytestream2_skip(&ctx->gb, 8); // skip pad
1356 
1357  return 0;
1358 }
1359 
1360 static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)
1361 {
1362  if (buf_size--) {
1363  *pbuf++ = color;
1364  av_memcpy_backptr((uint8_t*)pbuf, 2, 2*buf_size);
1365  }
1366 }
1367 
1368 static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)
1369 {
1370  uint8_t *dst;
1371  const uint8_t *src = (uint8_t*) ctx->frm0;
1372  int ret, height = ctx->height;
1373  ptrdiff_t dstpitch, srcpitch = ctx->pitch * (hdr ? sizeof(ctx->frm0[0]) : 1);
1374 
1375  if ((ret = ff_get_buffer(ctx->avctx, ctx->frame, 0)) < 0)
1376  return ret;
1377 
1378  dst = ctx->frame->data[0];
1379  dstpitch = ctx->frame->linesize[0];
1380 
1381  while (height--) {
1382  memcpy(dst, src, srcpitch);
1383  src += srcpitch;
1384  dst += dstpitch;
1385  }
1386 
1387  return 0;
1388 }
1389 
1390 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
1391  int *got_frame_ptr, AVPacket *pkt)
1392 {
1393  SANMVideoContext *ctx = avctx->priv_data;
1394  int i, ret;
1395 
1396  ctx->frame = frame;
1397  bytestream2_init(&ctx->gb, pkt->data, pkt->size);
1398 
1399  if (!ctx->version) {
1400  int to_store = 0;
1401 
1402  while (bytestream2_get_bytes_left(&ctx->gb) >= 8) {
1403  uint32_t sig, size;
1404  int pos;
1405 
1406  sig = bytestream2_get_be32u(&ctx->gb);
1407  size = bytestream2_get_be32u(&ctx->gb);
1408  pos = bytestream2_tell(&ctx->gb);
1409 
1410  if (bytestream2_get_bytes_left(&ctx->gb) < size) {
1411  av_log(avctx, AV_LOG_ERROR, "Incorrect chunk size %"PRIu32".\n", size);
1412  break;
1413  }
1414  switch (sig) {
1415  case MKBETAG('N', 'P', 'A', 'L'):
1416  if (size != PALETTE_SIZE * 3) {
1417  av_log(avctx, AV_LOG_ERROR,
1418  "Incorrect palette block size %"PRIu32".\n", size);
1419  return AVERROR_INVALIDDATA;
1420  }
1421  for (i = 0; i < PALETTE_SIZE; i++)
1422  ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
1423  break;
1424  case MKBETAG('F', 'O', 'B', 'J'):
1425  if (size < 16)
1426  return AVERROR_INVALIDDATA;
1427  if (ret = process_frame_obj(ctx))
1428  return ret;
1429  break;
1430  case MKBETAG('X', 'P', 'A', 'L'):
1431  if (size == 6 || size == 4) {
1432  uint8_t tmp[3];
1433  int j;
1434 
1435  for (i = 0; i < PALETTE_SIZE; i++) {
1436  for (j = 0; j < 3; j++) {
1437  int t = (ctx->pal[i] >> (16 - j * 8)) & 0xFF;
1438  tmp[j] = av_clip_uint8((t * 129 + ctx->delta_pal[i * 3 + j]) >> 7);
1439  }
1440  ctx->pal[i] = 0xFFU << 24 | AV_RB24(tmp);
1441  }
1442  } else {
1443  if (size < PALETTE_DELTA * 2 + 4) {
1444  av_log(avctx, AV_LOG_ERROR,
1445  "Incorrect palette change block size %"PRIu32".\n",
1446  size);
1447  return AVERROR_INVALIDDATA;
1448  }
1449  bytestream2_skipu(&ctx->gb, 4);
1450  for (i = 0; i < PALETTE_DELTA; i++)
1451  ctx->delta_pal[i] = bytestream2_get_le16u(&ctx->gb);
1452  if (size >= PALETTE_DELTA * 5 + 4) {
1453  for (i = 0; i < PALETTE_SIZE; i++)
1454  ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->gb);
1455  } else {
1456  memset(ctx->pal, 0, sizeof(ctx->pal));
1457  }
1458  }
1459  break;
1460  case MKBETAG('S', 'T', 'O', 'R'):
1461  to_store = 1;
1462  break;
1463  case MKBETAG('F', 'T', 'C', 'H'):
1464  memcpy(ctx->frm0, ctx->stored_frame, ctx->buf_size);
1465  break;
1466  default:
1467  bytestream2_skip(&ctx->gb, size);
1468  av_log(avctx, AV_LOG_DEBUG,
1469  "Unknown/unsupported chunk %"PRIx32".\n", sig);
1470  break;
1471  }
1472 
1473  bytestream2_seek(&ctx->gb, pos + size, SEEK_SET);
1474  if (size & 1)
1475  bytestream2_skip(&ctx->gb, 1);
1476  }
1477  if (to_store)
1478  memcpy(ctx->stored_frame, ctx->frm0, ctx->buf_size);
1479  if ((ret = copy_output(ctx, NULL)))
1480  return ret;
1481  memcpy(ctx->frame->data[1], ctx->pal, 1024);
1482  } else {
1483  SANMFrameHeader header;
1484 
1485  if ((ret = read_frame_header(ctx, &header)))
1486  return ret;
1487 
1488  ctx->rotate_code = header.rotate_code;
1489  if ((ctx->frame->key_frame = !header.seq_num)) {
1490  ctx->frame->pict_type = AV_PICTURE_TYPE_I;
1491  fill_frame(ctx->frm1, ctx->npixels, header.bg_color);
1492  fill_frame(ctx->frm2, ctx->npixels, header.bg_color);
1493  } else {
1494  ctx->frame->pict_type = AV_PICTURE_TYPE_P;
1495  }
1496 
1497  if (header.codec < FF_ARRAY_ELEMS(v1_decoders)) {
1498  if ((ret = v1_decoders[header.codec](ctx))) {
1499  av_log(avctx, AV_LOG_ERROR,
1500  "Subcodec %d: error decoding frame.\n", header.codec);
1501  return ret;
1502  }
1503  } else {
1504  avpriv_request_sample(avctx, "Subcodec %d", header.codec);
1505  return AVERROR_PATCHWELCOME;
1506  }
1507 
1508  if ((ret = copy_output(ctx, &header)))
1509  return ret;
1510  }
1511  if (ctx->rotate_code)
1512  rotate_bufs(ctx, ctx->rotate_code);
1513 
1514  *got_frame_ptr = 1;
1515 
1516  return pkt->size;
1517 }
1518 
1519 const FFCodec ff_sanm_decoder = {
1520  .p.name = "sanm",
1521  .p.long_name = NULL_IF_CONFIG_SMALL("LucasArts SANM/Smush video"),
1522  .p.type = AVMEDIA_TYPE_VIDEO,
1523  .p.id = AV_CODEC_ID_SANM,
1524  .priv_data_size = sizeof(SANMVideoContext),
1525  .init = decode_init,
1526  .close = decode_end,
1527  FF_CODEC_DECODE_CB(decode_frame),
1528  .p.capabilities = AV_CODEC_CAP_DR1,
1529 };
SANMVideoContext::width
int width
Definition: sanm.c:273
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AV_CODEC_ID_SANM
@ AV_CODEC_ID_SANM
Definition: codec_id.h:232
motion_vectors
static const int8_t motion_vectors[256][2]
Definition: sanm.c:54
decode_0
static int decode_0(SANMVideoContext *ctx)
Definition: sanm.c:992
BOTTOM_EDGE
@ BOTTOM_EDGE
Definition: sanm.c:308
SANMVideoContext::rle_buf
uint8_t * rle_buf
Definition: sanm.c:283
decode_5
static int decode_5(SANMVideoContext *ctx)
Definition: sanm.c:1253
fill_block
static void fill_block(uint16_t *pdest, uint16_t color, int block_size, ptrdiff_t pitch)
Definition: sanm.c:1034
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
make_glyphs
static void make_glyphs(int8_t *pglyphs, const int8_t *xvec, const int8_t *yvec, const int side_length)
Construct glyphs by iterating through vector coordinates.
Definition: sanm.c:386
color
Definition: vf_paletteuse.c:600
process_block
static int process_block(SANMVideoContext *ctx, uint8_t *dst, uint8_t *prev1, uint8_t *prev2, int stride, int tbl, int size)
Definition: sanm.c:770
GetByteContext
Definition: bytestream.h:33
SANMVideoContext::pal
uint32_t pal[PALETTE_SIZE]
Definition: sanm.c:269
SANMFrameHeader
Definition: sanm.c:297
SANMVideoContext::stored_frame
uint8_t * stored_frame
Definition: sanm.c:279
bytestream2_skipu
static av_always_inline void bytestream2_skipu(GetByteContext *g, unsigned int size)
Definition: bytestream.h:174
SANMVideoContext::aligned_height
int aligned_height
Definition: sanm.c:274
SANMVideoContext::p4x4glyphs
int8_t p4x4glyphs[NGLYPHS][16]
Definition: sanm.c:293
SANMVideoContext::frm0
uint16_t * frm0
Definition: sanm.c:278
SANMFrameHeader::bg_color
uint16_t bg_color
Definition: sanm.c:300
good_mvec
static int good_mvec(SANMVideoContext *ctx, int cx, int cy, int mx, int my, int block_size)
Definition: sanm.c:1128
out_size
int out_size
Definition: movenc.c:55
bytestream2_seek
static av_always_inline int bytestream2_seek(GetByteContext *g, int offset, int whence)
Definition: bytestream.h:212
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:28
w
uint8_t w
Definition: llviddspenc.c:38
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:374
decode_end
static av_cold int decode_end(AVCodecContext *avctx)
Definition: sanm.c:523
interp_point
static void interp_point(int8_t *points, int x0, int y0, int x1, int y1, int pos, int npoints)
Definition: sanm.c:366
FFCodec
Definition: codec_internal.h:118
copy_block8
static void copy_block8(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)
Definition: copy_block.h:47
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
decode_3
static int decode_3(SANMVideoContext *ctx)
Definition: sanm.c:1241
ff_sanm_decoder
const FFCodec ff_sanm_decoder
Definition: sanm.c:1519
old_codec37
static int old_codec37(SANMVideoContext *ctx, int top, int left, int width, int height)
Definition: sanm.c:624
init
static int init
Definition: av_tx.c:47
bytestream2_skip
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:168
SANMVideoContext::frame
AVFrame * frame
Definition: sanm.c:277
SANMFrameHeader::codec
int codec
Definition: sanm.c:298
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:122
LEFT_EDGE
@ LEFT_EDGE
Definition: sanm.c:305
old_codec47
static int old_codec47(SANMVideoContext *ctx, int top, int left, int width, int height)
Definition: sanm.c:860
glyph8_x
static const int8_t glyph8_x[GLYPH_COORD_VECT_SIZE]
Definition: sanm.c:46
SANMFrameHeader::rotate_code
int rotate_code
Definition: sanm.c:298
SANMVideoContext::gb
GetByteContext gb
Definition: sanm.c:266
destroy_buffers
static void destroy_buffers(SANMVideoContext *ctx)
Definition: sanm.c:451
val
static double val(void *priv, double ch)
Definition: aeval.c:77
decode_2
static int decode_2(SANMVideoContext *ctx)
Definition: sanm.c:1229
SANMVideoContext::small_codebook
uint16_t small_codebook[4]
Definition: sanm.c:291
DIR_LEFT
@ DIR_LEFT
Definition: sanm.c:313
which_edge
static enum GlyphEdge which_edge(int x, int y, int edge_size)
Return enum GlyphEdge of box where point (x, y) lies.
Definition: sanm.c:327
NO_EDGE
@ NO_EDGE
Definition: sanm.c:309
TOP_EDGE
@ TOP_EDGE
Definition: sanm.c:306
avassert.h
old_codec1
static int old_codec1(SANMVideoContext *ctx, int top, int left, int width, int height)
Definition: sanm.c:558
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
SANMFrameHeader::width
uint32_t width
Definition: sanm.c:301
av_memcpy_backptr
void av_memcpy_backptr(uint8_t *dst, int back, int cnt)
Overlapping memcpy() implementation.
Definition: mem.c:455
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:500
width
#define width
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:260
SANMFrameHeader::rle_output_size
int rle_output_size
Definition: sanm.c:298
decode_6
static int decode_6(SANMVideoContext *ctx)
Definition: sanm.c:1276
SANMVideoContext::npixels
long npixels
Definition: sanm.c:288
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
opcode_0xf8
static int opcode_0xf8(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)
Definition: sanm.c:1100
ctx
AVFormatContext * ctx
Definition: movenc.c:48
SANMVideoContext::stored_frame_size
uint32_t stored_frame_size
Definition: sanm.c:281
AV_RL16
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_RL16
Definition: bytestream.h:94
FFABS
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:64
if
if(ret)
Definition: filter_design.txt:179
GlyphEdge
GlyphEdge
Definition: sanm.c:304
init_sizes
static void init_sizes(SANMVideoContext *ctx, int width, int height)
Definition: sanm.c:438
copy_block16
static void copy_block16(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)
Definition: copy_block.h:68
NULL
#define NULL
Definition: coverity.c:32
SANMFrameHeader::height
uint32_t height
Definition: sanm.c:301
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
SANMVideoContext::aligned_width
int aligned_width
Definition: sanm.c:274
SANMVideoContext::avctx
AVCodecContext * avctx
Definition: sanm.c:265
SANMVideoContext::subversion
int subversion
Definition: sanm.c:268
draw_glyph
static int draw_glyph(SANMVideoContext *ctx, uint16_t *dst, int index, uint16_t fg_color, uint16_t bg_color, int block_size, ptrdiff_t pitch)
Definition: sanm.c:1044
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
decode_nop
static int decode_nop(SANMVideoContext *ctx)
Definition: sanm.c:1009
bytestream2_get_buffer
static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:267
PALETTE_SIZE
#define PALETTE_SIZE
Definition: sanm.c:35
SANMVideoContext::frm1_size
uint32_t frm1_size
Definition: sanm.c:280
SANMVideoContext::frm1
uint16_t * frm1
Definition: sanm.c:278
rotate_bufs
static void rotate_bufs(SANMVideoContext *ctx, int rotate_code)
Definition: sanm.c:482
index
int index
Definition: gxfenc.c:89
bytestream2_get_bytes_left
static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:158
bytestream2_tell
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:192
glyph4_y
static const int8_t glyph4_y[GLYPH_COORD_VECT_SIZE]
Definition: sanm.c:42
NGLYPHS
#define NGLYPHS
Definition: sanm.c:33
SANMVideoContext::frm2_size
uint32_t frm2_size
Definition: sanm.c:280
ff_get_buffer
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1462
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:375
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
SANMVideoContext
Definition: sanm.c:264
codec37_mv
static void codec37_mv(uint8_t *dst, const uint8_t *src, int height, int stride, int x, int y)
Definition: sanm.c:605
codec_internal.h
glyph8_y
static const int8_t glyph8_y[GLYPH_COORD_VECT_SIZE]
Definition: sanm.c:50
decode_4
static int decode_4(SANMVideoContext *ctx)
Definition: sanm.c:1247
size
int size
Definition: twinvq_data.h:10344
color
static const uint32_t color[16+AV_CLASS_CATEGORY_NB]
Definition: log.c:94
MKBETAG
#define MKBETAG(a, b, c, d)
Definition: macros.h:56
avpriv_report_missing_feature
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
SANMVideoContext::version
int version
Definition: sanm.c:268
header
static const uint8_t header[24]
Definition: sdr2.c:67
height
#define height
decode_init
static av_cold int decode_init(AVCodecContext *avctx)
Definition: sanm.c:489
av_bswap16
#define av_bswap16
Definition: bswap.h:31
rle_decode
static int rle_decode(SANMVideoContext *ctx, uint8_t *dst, const int out_size)
Definition: sanm.c:532
PALETTE_DELTA
#define PALETTE_DELTA
Definition: sanm.c:36
flag
#define flag(name)
Definition: cbs_av1.c:553
copy_block4
static void copy_block4(uint8_t *dst, const uint8_t *src, ptrdiff_t dstStride, ptrdiff_t srcStride, int h)
Definition: copy_block.h:37
av_assert2
#define av_assert2(cond)
assert() equivalent, that does lie in speed critical code.
Definition: avassert.h:64
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
fill_frame
static void fill_frame(uint16_t *pbuf, int buf_size, uint16_t color)
Definition: sanm.c:1360
copy_block.h
copy_block
static void copy_block(uint16_t *pdest, uint16_t *psrc, int block_size, ptrdiff_t pitch)
Definition: sanm.c:1015
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:499
SANMFrameHeader::seq_num
int seq_num
Definition: sanm.c:298
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:211
len
int len
Definition: vorbis_enc_data.h:426
AVCodecContext::height
int height
Definition: avcodec.h:571
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:608
AV_PIX_FMT_RGB565
#define AV_PIX_FMT_RGB565
Definition: pixfmt.h:395
avcodec.h
stride
#define stride
Definition: h264pred_template.c:537
SANMVideoContext::codebook
uint16_t codebook[256]
Definition: sanm.c:290
read_frame_header
static int read_frame_header(SANMVideoContext *ctx, SANMFrameHeader *hdr)
Definition: sanm.c:1320
GlyphDir
GlyphDir
Definition: sanm.c:312
AV_PIX_FMT_PAL8
@ AV_PIX_FMT_PAL8
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
DIR_DOWN
@ DIR_DOWN
Definition: sanm.c:316
ret
ret
Definition: filter_design.txt:187
bswap.h
glyph4_x
static const int8_t glyph4_x[GLYPH_COORD_VECT_SIZE]
Definition: sanm.c:38
FFSWAP
#define FFSWAP(type, a, b)
Definition: macros.h:52
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
SANMVideoContext::frm2
uint16_t * frm2
Definition: sanm.c:278
DIR_RIGHT
@ DIR_RIGHT
Definition: sanm.c:315
pos
unsigned int pos
Definition: spdifenc.c:412
process_frame_obj
static int process_frame_obj(SANMVideoContext *ctx)
Definition: sanm.c:951
c37_mv
static const int8_t c37_mv[]
Definition: sanm.c:108
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
run_len
static const uint8_t run_len[7][16]
Definition: h264_cavlc.c:217
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
U
#define U(x)
Definition: vpx_arith.h:37
GLYPH_COORD_VECT_SIZE
#define GLYPH_COORD_VECT_SIZE
Definition: sanm.c:34
AVCodecContext
main external API structure.
Definition: avcodec.h:398
copy_output
static int copy_output(SANMVideoContext *ctx, SANMFrameHeader *hdr)
Definition: sanm.c:1368
SANMVideoContext::rle_buf_size
unsigned int rle_buf_size
Definition: sanm.c:284
SANMVideoContext::buf_size
long buf_size
Definition: sanm.c:288
av_fast_padded_mallocz
void av_fast_padded_mallocz(void *ptr, unsigned int *size, size_t min_size)
Same behaviour av_fast_padded_malloc except that buffer will always be 0-initialized after call.
Definition: utils.c:61
which_direction
static enum GlyphDir which_direction(enum GlyphEdge edge0, enum GlyphEdge edge1)
Definition: sanm.c:343
av_clip_uint8
#define av_clip_uint8
Definition: common.h:101
RIGHT_EDGE
@ RIGHT_EDGE
Definition: sanm.c:307
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
SANMVideoContext::p8x8glyphs
int8_t p8x8glyphs[NGLYPHS][64]
Definition: sanm.c:294
ff_set_dimensions
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:90
bytestream2_get_bufferu
static av_always_inline unsigned int bytestream2_get_bufferu(GetByteContext *g, uint8_t *dst, unsigned int size)
Definition: bytestream.h:277
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
opcode_0xf7
static int opcode_0xf7(SANMVideoContext *ctx, int cx, int cy, int block_size, ptrdiff_t pitch)
Definition: sanm.c:1066
FFALIGN
#define FFALIGN(x, a)
Definition: macros.h:78
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:425
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
av_fast_malloc
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:565
src
INIT_CLIP pixel * src
Definition: h264pred_template.c:418
codec2subblock
static int codec2subblock(SANMVideoContext *ctx, int cx, int cy, int blk_size)
Definition: sanm.c:1144
frm_decoder
int(* frm_decoder)(SANMVideoContext *ctx)
Definition: sanm.c:1313
AVCodecContext::width
int width
picture width / height.
Definition: avcodec.h:571
bytestream.h
imgutils.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
DIR_UP
@ DIR_UP
Definition: sanm.c:314
v1_decoders
static const frm_decoder v1_decoders[]
Definition: sanm.c:1315
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
h
h
Definition: vp9dsp_template.c:2038
SANMVideoContext::delta_pal
int16_t delta_pal[PALETTE_DELTA]
Definition: sanm.c:270
NO_DIR
@ NO_DIR
Definition: sanm.c:317
AV_RB24
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_RB24
Definition: bytestream.h:97
int
int
Definition: ffmpeg_filter.c:155
SANMVideoContext::rotate_code
int rotate_code
Definition: sanm.c:286
SANMVideoContext::pitch
ptrdiff_t pitch
Definition: sanm.c:272
SANMVideoContext::frm0_size
uint32_t frm0_size
Definition: sanm.c:280
SANMVideoContext::prev_seq
int prev_seq
Definition: sanm.c:275
SANMVideoContext::height
int height
Definition: sanm.c:273
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static int decode_8(SANMVideoContext *ctx)
Definition: sanm.c:1291
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static int decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame_ptr, AVPacket *pkt)
Definition: sanm.c:1390
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static av_cold int init_buffers(SANMVideoContext *ctx)
Definition: sanm.c:464
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