1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
|
/*
* ScreenPressor decoder
*
* Copyright (c) 2017 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_SCPR_H
#define AVCODEC_SCPR_H
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "scpr3.h"
typedef struct RangeCoder {
uint32_t code;
uint32_t range;
uint32_t code1;
} RangeCoder;
typedef struct PixelModel {
uint32_t freq[256];
uint32_t lookup[16];
uint32_t total_freq;
} PixelModel;
typedef struct SCPRContext {
int version;
AVFrame *last_frame;
AVFrame *current_frame;
GetByteContext gb;
RangeCoder rc;
PixelModel pixel_model[3][4096];
uint32_t op_model[6][7];
uint32_t run_model[6][257];
uint32_t range_model[257];
uint32_t count_model[257];
uint32_t fill_model[6];
uint32_t sxy_model[4][17];
uint32_t mv_model[2][513];
uint32_t nbx, nby;
uint32_t nbcount;
uint32_t *blocks;
uint32_t cbits;
int cxshift;
PixelModel3 pixel_model3[3][4096];
RunModel3 run_model3[6];
RunModel3 range_model3;
RunModel3 count_model3;
FillModel3 fill_model3;
SxyModel3 sxy_model3[4];
MVModel3 mv_model3[2];
OpModel3 op_model3[6];
int (*get_freq)(RangeCoder *rc, uint32_t total_freq, uint32_t *freq);
int (*decode)(GetByteContext *gb, RangeCoder *rc, uint32_t cumFreq, uint32_t freq, uint32_t total_freq);
} SCPRContext;
static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
int *x, int *y, uint32_t clr, uint32_t *dst,
int linesize, uint32_t *lx, uint32_t *ly,
uint32_t backstep, int off, int *cx, int *cx1)
{
uint32_t r, g, b;
int z;
switch (ptype) {
case 0:
while (run-- > 0) {
if (*y >= avctx->height)
return AVERROR_INVALIDDATA;
dst[*y * linesize + *x] = clr;
*lx = *x;
*ly = *y;
(*x)++;
if (*x >= avctx->width) {
*x = 0;
(*y)++;
}
}
break;
case 1:
while (run-- > 0) {
if (*y >= avctx->height)
return AVERROR_INVALIDDATA;
dst[*y * linesize + *x] = dst[*ly * linesize + *lx];
*lx = *x;
*ly = *y;
(*x)++;
if (*x >= avctx->width) {
*x = 0;
(*y)++;
}
}
clr = dst[*ly * linesize + *lx];
break;
case 2:
while (run-- > 0) {
if (*y < 1 || *y >= avctx->height)
return AVERROR_INVALIDDATA;
clr = dst[*y * linesize + *x + off + 1];
dst[*y * linesize + *x] = clr;
*lx = *x;
*ly = *y;
(*x)++;
if (*x >= avctx->width) {
*x = 0;
(*y)++;
}
}
break;
case 4:
while (run-- > 0) {
uint8_t *odst = (uint8_t *)dst;
if (*y < 1 || *y >= avctx->height ||
(*y == 1 && *x == 0))
return AVERROR_INVALIDDATA;
if (*x == 0) {
z = backstep;
} else {
z = 0;
}
r = odst[(*ly * linesize + *lx) * 4] +
odst[((*y * linesize + *x) + off) * 4 + 4] -
odst[((*y * linesize + *x) + off - z) * 4];
g = odst[(*ly * linesize + *lx) * 4 + 1] +
odst[((*y * linesize + *x) + off) * 4 + 5] -
odst[((*y * linesize + *x) + off - z) * 4 + 1];
b = odst[(*ly * linesize + *lx) * 4 + 2] +
odst[((*y * linesize + *x) + off) * 4 + 6] -
odst[((*y * linesize + *x) + off - z) * 4 + 2];
clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
dst[*y * linesize + *x] = clr;
*lx = *x;
*ly = *y;
(*x)++;
if (*x >= avctx->width) {
*x = 0;
(*y)++;
}
}
break;
case 5:
while (run-- > 0) {
if (*y < 1 || *y >= avctx->height ||
(*y == 1 && *x == 0))
return AVERROR_INVALIDDATA;
if (*x == 0) {
z = backstep;
} else {
z = 0;
}
clr = dst[*y * linesize + *x + off - z];
dst[*y * linesize + *x] = clr;
*lx = *x;
*ly = *y;
(*x)++;
if (*x >= avctx->width) {
*x = 0;
(*y)++;
}
}
break;
}
if (avctx->bits_per_coded_sample == 16) {
*cx1 = (clr & 0x3F00) >> 2;
*cx = (clr & 0x3FFFFF) >> 16;
} else {
*cx1 = (clr & 0xFC00) >> 4;
*cx = (clr & 0xFFFFFF) >> 18;
}
return 0;
}
static int decode_run_p(AVCodecContext *avctx, uint32_t ptype, int run,
int x, int y, uint32_t clr,
uint32_t *dst, uint32_t *prev,
int linesize, int plinesize,
uint32_t *bx, uint32_t *by,
uint32_t backstep, int sx1, int sx2,
int *cx, int *cx1)
{
uint32_t r, g, b;
int z;
switch (ptype) {
case 0:
while (run-- > 0) {
if (*by >= avctx->height)
return AVERROR_INVALIDDATA;
dst[*by * linesize + *bx] = clr;
(*bx)++;
if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
*bx = x * 16 + sx1;
(*by)++;
}
}
break;
case 1:
while (run-- > 0) {
if (*bx == 0) {
if (*by < 1)
return AVERROR_INVALIDDATA;
z = backstep;
} else {
z = 0;
}
if (*by >= avctx->height)
return AVERROR_INVALIDDATA;
clr = dst[*by * linesize + *bx - 1 - z];
dst[*by * linesize + *bx] = clr;
(*bx)++;
if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
*bx = x * 16 + sx1;
(*by)++;
}
}
break;
case 2:
while (run-- > 0) {
if (*by < 1 || *by >= avctx->height)
return AVERROR_INVALIDDATA;
clr = dst[(*by - 1) * linesize + *bx];
dst[*by * linesize + *bx] = clr;
(*bx)++;
if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
*bx = x * 16 + sx1;
(*by)++;
}
}
break;
case 3:
while (run-- > 0) {
if (*by >= avctx->height)
return AVERROR_INVALIDDATA;
clr = prev[*by * plinesize + *bx];
dst[*by * linesize + *bx] = clr;
(*bx)++;
if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
*bx = x * 16 + sx1;
(*by)++;
}
}
break;
case 4:
while (run-- > 0) {
uint8_t *odst = (uint8_t *)dst;
if (*by < 1 || *by >= avctx->height)
return AVERROR_INVALIDDATA;
if (*bx == 0) {
if (*by < 2)
return AVERROR_INVALIDDATA;
z = backstep;
} else {
z = 0;
}
r = odst[((*by - 1) * linesize + *bx) * 4] +
odst[(*by * linesize + *bx - 1 - z) * 4] -
odst[((*by - 1) * linesize + *bx - 1 - z) * 4];
g = odst[((*by - 1) * linesize + *bx) * 4 + 1] +
odst[(*by * linesize + *bx - 1 - z) * 4 + 1] -
odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 1];
b = odst[((*by - 1) * linesize + *bx) * 4 + 2] +
odst[(*by * linesize + *bx - 1 - z) * 4 + 2] -
odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 2];
clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
dst[*by * linesize + *bx] = clr;
(*bx)++;
if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
*bx = x * 16 + sx1;
(*by)++;
}
}
break;
case 5:
while (run-- > 0) {
if (*by < 1 || *by >= avctx->height)
return AVERROR_INVALIDDATA;
if (*bx == 0) {
if (*by < 2)
return AVERROR_INVALIDDATA;
z = backstep;
} else {
z = 0;
}
clr = dst[(*by - 1) * linesize + *bx - 1 - z];
dst[*by * linesize + *bx] = clr;
(*bx)++;
if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
*bx = x * 16 + sx1;
(*by)++;
}
}
break;
}
if (avctx->bits_per_coded_sample == 16) {
*cx1 = (clr & 0x3F00) >> 2;
*cx = (clr & 0x3FFFFF) >> 16;
} else {
*cx1 = (clr & 0xFC00) >> 4;
*cx = (clr & 0xFFFFFF) >> 18;
}
return 0;
}
#endif /* AVCODEC_SCPR_H */
|
