GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/scpr.h Lines: 0 204 0.0 %
Date: 2020-08-14 10:39:37 Branches: 0 143 0.0 %

Line Branch Exec Source
1
/*
2
 * ScreenPressor decoder
3
 *
4
 * Copyright (c) 2017 Paul B Mahol
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
#ifndef AVCODEC_SCPR_H
24
#define AVCODEC_SCPR_H
25
26
#include <stdio.h>
27
#include <stdlib.h>
28
#include <string.h>
29
30
#include "avcodec.h"
31
#include "bytestream.h"
32
#include "internal.h"
33
#include "scpr3.h"
34
35
typedef struct RangeCoder {
36
    uint32_t   code;
37
    uint32_t   range;
38
    uint32_t   code1;
39
} RangeCoder;
40
41
typedef struct PixelModel {
42
    uint32_t    freq[256];
43
    uint32_t    lookup[16];
44
    uint32_t    total_freq;
45
} PixelModel;
46
47
typedef struct SCPRContext {
48
    int             version;
49
    AVFrame        *last_frame;
50
    AVFrame        *current_frame;
51
    GetByteContext  gb;
52
    RangeCoder      rc;
53
    PixelModel      pixel_model[3][4096];
54
    uint32_t        op_model[6][7];
55
    uint32_t        run_model[6][257];
56
    uint32_t        range_model[257];
57
    uint32_t        count_model[257];
58
    uint32_t        fill_model[6];
59
    uint32_t        sxy_model[4][17];
60
    uint32_t        mv_model[2][513];
61
    uint32_t        nbx, nby;
62
    uint32_t        nbcount;
63
    uint32_t       *blocks;
64
    uint32_t        cbits;
65
    int             cxshift;
66
67
    PixelModel3     pixel_model3[3][4096];
68
    RunModel3       run_model3[6];
69
    RunModel3       range_model3;
70
    RunModel3       count_model3;
71
    FillModel3      fill_model3;
72
    SxyModel3       sxy_model3[4];
73
    MVModel3        mv_model3[2];
74
    OpModel3        op_model3[6];
75
76
    int           (*get_freq)(RangeCoder *rc, uint32_t total_freq, uint32_t *freq);
77
    int           (*decode)(GetByteContext *gb, RangeCoder *rc, uint32_t cumFreq, uint32_t freq, uint32_t total_freq);
78
} SCPRContext;
79
80
static int decode_run_i(AVCodecContext *avctx, uint32_t ptype, int run,
81
                        int *px, int *py, uint32_t clr, uint32_t *dst,
82
                        int linesize, uint32_t *plx, uint32_t *ply,
83
                        uint32_t backstep, int off, int *cx, int *cx1)
84
{
85
    uint32_t r, g, b;
86
    int z;
87
    int x = *px,
88
        y = *py;
89
    uint32_t lx = *plx,
90
             ly = *ply;
91
92
    if (y >= avctx->height)
93
        return AVERROR_INVALIDDATA;
94
95
    switch (ptype) {
96
    case 0:
97
        while (run-- > 0) {
98
            dst[y * linesize + x] = clr;
99
            lx = x;
100
            ly = y;
101
            (x)++;
102
            if (x >= avctx->width) {
103
                x = 0;
104
                (y)++;
105
                if (y >= avctx->height && run)
106
                    return AVERROR_INVALIDDATA;
107
            }
108
        }
109
        break;
110
    case 1:
111
        while (run-- > 0) {
112
            dst[y * linesize + x] = dst[ly * linesize + lx];
113
            lx = x;
114
            ly = y;
115
            (x)++;
116
            if (x >= avctx->width) {
117
                x = 0;
118
                (y)++;
119
                if (y >= avctx->height && run)
120
                    return AVERROR_INVALIDDATA;
121
            }
122
        }
123
        clr = dst[ly * linesize + lx];
124
        break;
125
    case 2:
126
        if (y < 1)
127
            return AVERROR_INVALIDDATA;
128
129
        while (run-- > 0) {
130
            clr = dst[y * linesize + x + off + 1];
131
            dst[y * linesize + x] = clr;
132
            lx = x;
133
            ly = y;
134
            (x)++;
135
            if (x >= avctx->width) {
136
                x = 0;
137
                (y)++;
138
                if (y >= avctx->height && run)
139
                    return AVERROR_INVALIDDATA;
140
            }
141
        }
142
        break;
143
    case 4:
144
        if (y < 1 || (y == 1 && x == 0))
145
            return AVERROR_INVALIDDATA;
146
147
        while (run-- > 0) {
148
            uint8_t *odst = (uint8_t *)dst;
149
            int off1 = (ly * linesize + lx) * 4;
150
            int off2 = ((y * linesize + x) + off) * 4;
151
152
            if (x == 0) {
153
                z = backstep * 4;
154
            } else {
155
                z = 0;
156
            }
157
158
            r = odst[off1] +
159
                odst[off2 + 4] -
160
                odst[off2 - z ];
161
            g = odst[off1 + 1] +
162
                odst[off2 + 5] -
163
                odst[off2 - z  + 1];
164
            b = odst[off1 + 2] +
165
                odst[off2 + 6] -
166
                odst[off2 - z  + 2];
167
            clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
168
            dst[y * linesize + x] = clr;
169
            lx = x;
170
            ly = y;
171
            (x)++;
172
            if (x >= avctx->width) {
173
                x = 0;
174
                (y)++;
175
                if (y >= avctx->height && run)
176
                    return AVERROR_INVALIDDATA;
177
            }
178
        }
179
        break;
180
    case 5:
181
        if (y < 1 || (y == 1 && x == 0))
182
            return AVERROR_INVALIDDATA;
183
184
        while (run-- > 0) {
185
            if (x == 0) {
186
                z = backstep;
187
            } else {
188
                z = 0;
189
            }
190
191
            clr = dst[y * linesize + x + off - z];
192
            dst[y * linesize + x] = clr;
193
            lx = x;
194
            ly = y;
195
            (x)++;
196
            if (x >= avctx->width) {
197
                x = 0;
198
                (y)++;
199
                if (y >= avctx->height && run)
200
                    return AVERROR_INVALIDDATA;
201
            }
202
        }
203
        break;
204
    }
205
206
    *px = x;
207
    *py = y;
208
    *plx= lx;
209
    *ply= ly;
210
211
    if (avctx->bits_per_coded_sample == 16) {
212
        *cx1 = (clr & 0x3F00) >> 2;
213
        *cx = (clr & 0x3FFFFF) >> 16;
214
    } else {
215
        *cx1 = (clr & 0xFC00) >> 4;
216
        *cx = (clr & 0xFFFFFF) >> 18;
217
    }
218
219
    return 0;
220
}
221
222
static int decode_run_p(AVCodecContext *avctx, uint32_t ptype, int run,
223
                        int x, int y, uint32_t clr,
224
                        uint32_t *dst, uint32_t *prev,
225
                        int linesize, int plinesize,
226
                        uint32_t *bx, uint32_t *by,
227
                        uint32_t backstep, int sx1, int sx2,
228
                        int *cx, int *cx1)
229
{
230
    uint32_t r, g, b;
231
    int z;
232
233
    switch (ptype) {
234
    case 0:
235
        while (run-- > 0) {
236
            if (*by >= avctx->height)
237
                return AVERROR_INVALIDDATA;
238
239
            dst[*by * linesize + *bx] = clr;
240
            (*bx)++;
241
            if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
242
                *bx = x * 16 + sx1;
243
                (*by)++;
244
            }
245
        }
246
        break;
247
    case 1:
248
        while (run-- > 0) {
249
            if (*bx == 0) {
250
                if (*by < 1)
251
                    return AVERROR_INVALIDDATA;
252
                z = backstep;
253
            } else {
254
                z = 0;
255
            }
256
257
            if (*by >= avctx->height)
258
                return AVERROR_INVALIDDATA;
259
260
            clr = dst[*by * linesize + *bx - 1 - z];
261
            dst[*by * linesize + *bx] = clr;
262
            (*bx)++;
263
            if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
264
                *bx = x * 16 + sx1;
265
                (*by)++;
266
            }
267
        }
268
        break;
269
    case 2:
270
        while (run-- > 0) {
271
            if (*by < 1 || *by >= avctx->height)
272
                return AVERROR_INVALIDDATA;
273
274
            clr = dst[(*by - 1) * linesize + *bx];
275
            dst[*by * linesize + *bx] = clr;
276
            (*bx)++;
277
            if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
278
                *bx = x * 16 + sx1;
279
                (*by)++;
280
            }
281
        }
282
        break;
283
    case 3:
284
        while (run-- > 0) {
285
            if (*by >= avctx->height)
286
                return AVERROR_INVALIDDATA;
287
288
            clr = prev[*by * plinesize + *bx];
289
            dst[*by * linesize + *bx] = clr;
290
            (*bx)++;
291
            if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
292
                *bx = x * 16 + sx1;
293
                (*by)++;
294
            }
295
        }
296
        break;
297
    case 4:
298
        while (run-- > 0) {
299
            uint8_t *odst = (uint8_t *)dst;
300
301
            if (*by < 1 || *by >= avctx->height)
302
                return AVERROR_INVALIDDATA;
303
304
            if (*bx == 0) {
305
                if (*by < 2)
306
                    return AVERROR_INVALIDDATA;
307
                z = backstep;
308
            } else {
309
                z = 0;
310
            }
311
312
            r = odst[((*by - 1) * linesize + *bx) * 4] +
313
                odst[(*by * linesize + *bx - 1 - z) * 4] -
314
                odst[((*by - 1) * linesize + *bx - 1 - z) * 4];
315
            g = odst[((*by - 1) * linesize + *bx) * 4 + 1] +
316
                odst[(*by * linesize + *bx - 1 - z) * 4 + 1] -
317
                odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 1];
318
            b = odst[((*by - 1) * linesize + *bx) * 4 + 2] +
319
                odst[(*by * linesize + *bx - 1 - z) * 4 + 2] -
320
                odst[((*by - 1) * linesize + *bx - 1 - z) * 4 + 2];
321
            clr = ((b & 0xFF) << 16) + ((g & 0xFF) << 8) + (r & 0xFF);
322
            dst[*by * linesize + *bx] = clr;
323
            (*bx)++;
324
            if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
325
                *bx = x * 16 + sx1;
326
                (*by)++;
327
            }
328
        }
329
        break;
330
    case 5:
331
        while (run-- > 0) {
332
            if (*by < 1 || *by >= avctx->height)
333
                return AVERROR_INVALIDDATA;
334
335
            if (*bx == 0) {
336
                if (*by < 2)
337
                    return AVERROR_INVALIDDATA;
338
                z = backstep;
339
            } else {
340
                z = 0;
341
            }
342
343
            clr = dst[(*by - 1) * linesize + *bx - 1 - z];
344
            dst[*by * linesize + *bx] = clr;
345
            (*bx)++;
346
            if (*bx >= x * 16 + sx2 || *bx >= avctx->width) {
347
                *bx = x * 16 + sx1;
348
                (*by)++;
349
            }
350
        }
351
        break;
352
    }
353
354
    if (avctx->bits_per_coded_sample == 16) {
355
        *cx1 = (clr & 0x3F00) >> 2;
356
        *cx = (clr & 0x3FFFFF) >> 16;
357
    } else {
358
        *cx1 = (clr & 0xFC00) >> 4;
359
        *cx = (clr & 0xFFFFFF) >> 18;
360
    }
361
362
    return 0;
363
}
364
365
#endif /* AVCODEC_SCPR_H */