GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/g2meet.c Lines: 780 907 86.0 %
Date: 2019-11-18 18:00:01 Branches: 475 604 78.6 %

Line Branch Exec Source
1
/*
2
 * Go2Webinar / Go2Meeting decoder
3
 * Copyright (c) 2012 Konstantin Shishkov
4
 * Copyright (c) 2013 Maxim Poliakovski
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
/**
24
 * @file
25
 * Go2Webinar / Go2Meeting decoder
26
 */
27
28
#include <inttypes.h>
29
#include <zlib.h>
30
31
#include "libavutil/imgutils.h"
32
#include "libavutil/intreadwrite.h"
33
34
#include "avcodec.h"
35
#include "blockdsp.h"
36
#include "bytestream.h"
37
#include "elsdec.h"
38
#include "get_bits.h"
39
#include "idctdsp.h"
40
#include "internal.h"
41
#include "jpegtables.h"
42
#include "mjpeg.h"
43
44
#define EPIC_PIX_STACK_SIZE 1024
45
#define EPIC_PIX_STACK_MAX  (EPIC_PIX_STACK_SIZE - 1)
46
47
enum ChunkType {
48
    DISPLAY_INFO = 0xC8,
49
    TILE_DATA,
50
    CURSOR_POS,
51
    CURSOR_SHAPE,
52
    CHUNK_CC,
53
    CHUNK_CD
54
};
55
56
enum Compression {
57
    COMPR_EPIC_J_B = 2,
58
    COMPR_KEMPF_J_B,
59
};
60
61
static const uint8_t luma_quant[64] = {
62
     8,  6,  5,  8, 12, 20, 26, 31,
63
     6,  6,  7, 10, 13, 29, 30, 28,
64
     7,  7,  8, 12, 20, 29, 35, 28,
65
     7,  9, 11, 15, 26, 44, 40, 31,
66
     9, 11, 19, 28, 34, 55, 52, 39,
67
    12, 18, 28, 32, 41, 52, 57, 46,
68
    25, 32, 39, 44, 52, 61, 60, 51,
69
    36, 46, 48, 49, 56, 50, 52, 50
70
};
71
72
static const uint8_t chroma_quant[64] = {
73
     9,  9, 12, 24, 50, 50, 50, 50,
74
     9, 11, 13, 33, 50, 50, 50, 50,
75
    12, 13, 28, 50, 50, 50, 50, 50,
76
    24, 33, 50, 50, 50, 50, 50, 50,
77
    50, 50, 50, 50, 50, 50, 50, 50,
78
    50, 50, 50, 50, 50, 50, 50, 50,
79
    50, 50, 50, 50, 50, 50, 50, 50,
80
    50, 50, 50, 50, 50, 50, 50, 50,
81
};
82
83
typedef struct ePICPixListElem {
84
    struct ePICPixListElem *next;
85
    uint32_t               pixel;
86
    uint8_t                rung;
87
} ePICPixListElem;
88
89
typedef struct ePICPixHashElem {
90
    uint32_t                pix_id;
91
    struct ePICPixListElem  *list;
92
} ePICPixHashElem;
93
94
#define EPIC_HASH_SIZE 256
95
typedef struct ePICPixHash {
96
    ePICPixHashElem *bucket[EPIC_HASH_SIZE];
97
    int              bucket_size[EPIC_HASH_SIZE];
98
    int              bucket_fill[EPIC_HASH_SIZE];
99
} ePICPixHash;
100
101
typedef struct ePICContext {
102
    ElsDecCtx        els_ctx;
103
    int              next_run_pos;
104
    ElsUnsignedRung  unsigned_rung;
105
    uint8_t          W_flag_rung;
106
    uint8_t          N_flag_rung;
107
    uint8_t          W_ctx_rung[256];
108
    uint8_t          N_ctx_rung[512];
109
    uint8_t          nw_pred_rung[256];
110
    uint8_t          ne_pred_rung[256];
111
    uint8_t          prev_row_rung[14];
112
    uint8_t          runlen_zeroes[14];
113
    uint8_t          runlen_one;
114
    int              stack_pos;
115
    uint32_t         stack[EPIC_PIX_STACK_SIZE];
116
    ePICPixHash      hash;
117
} ePICContext;
118
119
typedef struct JPGContext {
120
    BlockDSPContext bdsp;
121
    IDCTDSPContext idsp;
122
    ScanTable  scantable;
123
124
    VLC        dc_vlc[2], ac_vlc[2];
125
    int        prev_dc[3];
126
    DECLARE_ALIGNED(32, int16_t, block)[6][64];
127
128
    uint8_t    *buf;
129
} JPGContext;
130
131
typedef struct G2MContext {
132
    ePICContext ec;
133
    JPGContext jc;
134
135
    int        version;
136
137
    int        compression;
138
    int        width, height, bpp;
139
    int        orig_width, orig_height;
140
    int        tile_width, tile_height;
141
    int        tiles_x, tiles_y, tile_x, tile_y;
142
143
    int        got_header;
144
145
    uint8_t    *framebuf;
146
    int        framebuf_stride, old_width, old_height;
147
148
    uint8_t    *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base;
149
    int        tile_stride, epic_buf_stride, old_tile_w, old_tile_h;
150
    int        swapuv;
151
152
    uint8_t    *kempf_buf, *kempf_flags;
153
154
    uint8_t    *cursor;
155
    int        cursor_stride;
156
    int        cursor_fmt;
157
    int        cursor_w, cursor_h, cursor_x, cursor_y;
158
    int        cursor_hot_x, cursor_hot_y;
159
} G2MContext;
160
161
24
static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
162
                             const uint8_t *val_table, int nb_codes,
163
                             int is_ac)
164
{
165
24
    uint8_t  huff_size[256] = { 0 };
166
    uint16_t huff_code[256];
167
    uint16_t huff_sym[256];
168
    int i;
169
170
24
    ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
171
172
6168
    for (i = 0; i < 256; i++)
173
6144
        huff_sym[i] = i + 16 * is_ac;
174
175
24
    if (is_ac)
176
12
        huff_sym[0] = 16 * 256;
177
178
24
    return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
179
                              huff_code, 2, 2, huff_sym, 2, 2, 0);
180
}
181
182
6
static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
183
{
184
    int ret;
185
186
6
    ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
187
                    avpriv_mjpeg_val_dc, 12, 0);
188
6
    if (ret)
189
        return ret;
190
6
    ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
191
                    avpriv_mjpeg_val_dc, 12, 0);
192
6
    if (ret)
193
        return ret;
194
6
    ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
195
                    avpriv_mjpeg_val_ac_luminance, 251, 1);
196
6
    if (ret)
197
        return ret;
198
6
    ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
199
                    avpriv_mjpeg_val_ac_chrominance, 251, 1);
200
6
    if (ret)
201
        return ret;
202
203
6
    ff_blockdsp_init(&c->bdsp, avctx);
204
6
    ff_idctdsp_init(&c->idsp, avctx);
205
6
    ff_init_scantable(c->idsp.idct_permutation, &c->scantable,
206
                      ff_zigzag_direct);
207
208
6
    return 0;
209
}
210
211
6
static av_cold void jpg_free_context(JPGContext *ctx)
212
{
213
    int i;
214
215
18
    for (i = 0; i < 2; i++) {
216
12
        ff_free_vlc(&ctx->dc_vlc[i]);
217
12
        ff_free_vlc(&ctx->ac_vlc[i]);
218
    }
219
220
6
    av_freep(&ctx->buf);
221
6
}
222
223
159
static void jpg_unescape(const uint8_t *src, int src_size,
224
                         uint8_t *dst, int *dst_size)
225
{
226
159
    const uint8_t *src_end = src + src_size;
227
159
    uint8_t *dst_start = dst;
228
229
155218
    while (src < src_end) {
230
155059
        uint8_t x = *src++;
231
232
155059
        *dst++ = x;
233
234

155059
        if (x == 0xFF && !*src)
235
893
            src++;
236
    }
237
159
    *dst_size = dst - dst_start;
238
159
}
239
240
38284
static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
241
                            int plane, int16_t *block)
242
{
243
    int dc, val, pos;
244
38284
    const int is_chroma = !!plane;
245
38284
    const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
246
247
38284
    if (get_bits_left(gb) < 1)
248
        return AVERROR_INVALIDDATA;
249
250
38284
    c->bdsp.clear_block(block);
251
38284
    dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
252
38284
    if (dc < 0)
253
        return AVERROR_INVALIDDATA;
254
38284
    if (dc)
255
22214
        dc = get_xbits(gb, dc);
256
38284
    dc                = dc * qmat[0] + c->prev_dc[plane];
257
38284
    block[0]          = dc;
258
38284
    c->prev_dc[plane] = dc;
259
260
38284
    pos = 0;
261
225358
    while (pos < 63) {
262
224976
        val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
263
224976
        if (val < 0)
264
            return AVERROR_INVALIDDATA;
265
224976
        pos += val >> 4;
266
224976
        val &= 0xF;
267
224976
        if (pos > 63)
268
37902
            return val ? AVERROR_INVALIDDATA : 0;
269
187074
        if (val) {
270
186680
            int nbits = val;
271
272
186680
            val                                 = get_xbits(gb, nbits);
273
186680
            val                                *= qmat[ff_zigzag_direct[pos]];
274
186680
            block[c->scantable.permutated[pos]] = val;
275
        }
276
    }
277
382
    return 0;
278
}
279
280
1684224
static inline void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
281
{
282
1684224
    out[ridx]     = av_clip_uint8(Y +              (91881 * V + 32768 >> 16));
283
1684224
    out[1]        = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
284
1684224
    out[2 - ridx] = av_clip_uint8(Y + (116130 * U             + 32768 >> 16));
285
1684224
}
286
287
159
static int jpg_decode_data(JPGContext *c, int width, int height,
288
                           const uint8_t *src, int src_size,
289
                           uint8_t *dst, int dst_stride,
290
                           const uint8_t *mask, int mask_stride, int num_mbs,
291
                           int swapuv)
292
{
293
    GetBitContext gb;
294
    int mb_w, mb_h, mb_x, mb_y, i, j;
295
    int bx, by;
296
    int unesc_size;
297
    int ret;
298
159
    const int ridx = swapuv ? 2 : 0;
299
300
159
    if ((ret = av_reallocp(&c->buf,
301
159
                           src_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0)
302
        return ret;
303
159
    jpg_unescape(src, src_size, c->buf, &unesc_size);
304
159
    memset(c->buf + unesc_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
305
159
    if((ret = init_get_bits8(&gb, c->buf, unesc_size)) < 0)
306
        return ret;
307
308
159
    width = FFALIGN(width, 16);
309
159
    mb_w  =  width        >> 4;
310
159
    mb_h  = (height + 15) >> 4;
311
312
159
    if (!num_mbs)
313
        num_mbs = mb_w * mb_h * 4;
314
315
636
    for (i = 0; i < 3; i++)
316
477
        c->prev_dc[i] = 1024;
317
159
    bx =
318
159
    by = 0;
319
159
    c->bdsp.clear_blocks(c->block[0]);
320
1069
    for (mb_y = 0; mb_y < mb_h; mb_y++) {
321
11926
        for (mb_x = 0; mb_x < mb_w; mb_x++) {
322

11016
            if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
323
4574
                !mask[mb_x * 2 +     mask_stride] &&
324
4458
                !mask[mb_x * 2 + 1 + mask_stride]) {
325
4437
                bx += 16;
326
4437
                continue;
327
            }
328
19737
            for (j = 0; j < 2; j++) {
329
39474
                for (i = 0; i < 2; i++) {
330

26316
                    if (mask && !mask[mb_x * 2 + i + j * mask_stride])
331
1190
                        continue;
332
25126
                    num_mbs--;
333
25126
                    if ((ret = jpg_decode_block(c, &gb, 0,
334
25126
                                                c->block[i + j * 2])) != 0)
335
                        return ret;
336
25126
                    c->idsp.idct(c->block[i + j * 2]);
337
                }
338
            }
339
19737
            for (i = 1; i < 3; i++) {
340
13158
                if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
341
                    return ret;
342
13158
                c->idsp.idct(c->block[i + 3]);
343
            }
344
345
111843
            for (j = 0; j < 16; j++) {
346
105264
                uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
347
1789488
                for (i = 0; i < 16; i++) {
348
                    int Y, U, V;
349
350
1684224
                    Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
351
1684224
                    U = c->block[4][(i >> 1) + (j >> 1) * 8] - 128;
352
1684224
                    V = c->block[5][(i >> 1) + (j >> 1) * 8] - 128;
353
1684224
                    yuv2rgb(out + i * 3, ridx, Y, U, V);
354
                }
355
            }
356
357
6579
            if (!num_mbs)
358
159
                return 0;
359
6420
            bx += 16;
360
        }
361
910
        bx  = 0;
362
910
        by += 16;
363
910
        if (mask)
364
910
            mask += mask_stride * 2;
365
    }
366
367
    return 0;
368
}
369
370
#define LOAD_NEIGHBOURS(x)      \
371
    W   = curr_row[(x)   - 1];  \
372
    N   = above_row[(x)];       \
373
    WW  = curr_row[(x)   - 2];  \
374
    NW  = above_row[(x)  - 1];  \
375
    NE  = above_row[(x)  + 1];  \
376
    NN  = above2_row[(x)];      \
377
    NNW = above2_row[(x) - 1];  \
378
    NWW = above_row[(x)  - 2];  \
379
    NNE = above2_row[(x) + 1]
380
381
#define UPDATE_NEIGHBOURS(x)    \
382
    NNW = NN;                   \
383
    NN  = NNE;                  \
384
    NWW = NW;                   \
385
    NW  = N;                    \
386
    N   = NE;                   \
387
    NE  = above_row[(x)  + 1];  \
388
    NNE = above2_row[(x) + 1]
389
390
#define R_shift 16
391
#define G_shift  8
392
#define B_shift  0
393
394
/* improved djb2 hash from http://www.cse.yorku.ca/~oz/hash.html */
395
97781
static int djb2_hash(uint32_t key)
396
{
397
97781
    uint32_t h = 5381;
398
399
97781
    h = (h * 33) ^ ((key >> 24) & 0xFF); // xxx: probably not needed at all
400
97781
    h = (h * 33) ^ ((key >> 16) & 0xFF);
401
97781
    h = (h * 33) ^ ((key >>  8) & 0xFF);
402
97781
    h = (h * 33) ^  (key        & 0xFF);
403
404
97781
    return h & (EPIC_HASH_SIZE - 1);
405
}
406
407
136
static void epic_hash_init(ePICPixHash *hash)
408
{
409
136
    memset(hash, 0, sizeof(*hash));
410
136
}
411
412
97247
static ePICPixHashElem *epic_hash_find(const ePICPixHash *hash, uint32_t key)
413
{
414
97247
    int i, idx = djb2_hash(key);
415
97247
    ePICPixHashElem *bucket = hash->bucket[idx];
416
417
97299
    for (i = 0; i < hash->bucket_fill[idx]; i++)
418
94232
        if (bucket[i].pix_id == key)
419
94180
            return &bucket[i];
420
421
3067
    return NULL;
422
}
423
424
534
static ePICPixHashElem *epic_hash_add(ePICPixHash *hash, uint32_t key)
425
{
426
    ePICPixHashElem *bucket, *ret;
427
534
    int idx = djb2_hash(key);
428
429
534
    if (hash->bucket_size[idx] > INT_MAX / sizeof(**hash->bucket))
430
        return NULL;
431
432
534
    if (!(hash->bucket_fill[idx] < hash->bucket_size[idx])) {
433
531
        int new_size = hash->bucket_size[idx] + 16;
434
531
        bucket = av_realloc(hash->bucket[idx], new_size * sizeof(*bucket));
435
531
        if (!bucket)
436
            return NULL;
437
531
        hash->bucket[idx]      = bucket;
438
531
        hash->bucket_size[idx] = new_size;
439
    }
440
441
534
    ret = &hash->bucket[idx][hash->bucket_fill[idx]++];
442
534
    memset(ret, 0, sizeof(*ret));
443
534
    ret->pix_id = key;
444
534
    return ret;
445
}
446
447
1658
static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
448
{
449
    ePICPixListElem *new_elem;
450
1658
    ePICPixHashElem *hash_elem = epic_hash_find(hash, key);
451
452
1658
    if (!hash_elem) {
453
534
        if (!(hash_elem = epic_hash_add(hash, key)))
454
            return AVERROR(ENOMEM);
455
    }
456
457
1658
    new_elem = av_mallocz(sizeof(*new_elem));
458
1658
    if (!new_elem)
459
        return AVERROR(ENOMEM);
460
461
1658
    new_elem->pixel = pix;
462
1658
    new_elem->next  = hash_elem->list;
463
1658
    hash_elem->list = new_elem;
464
465
1658
    return 0;
466
}
467
468
41955
static inline int epic_cache_entries_for_pixel(const ePICPixHash *hash,
469
                                               uint32_t pix)
470
{
471
41955
    ePICPixHashElem *hash_elem = epic_hash_find(hash, pix);
472
473

41955
    if (hash_elem != NULL && hash_elem->list != NULL)
474
39956
        return 1;
475
476
1999
    return 0;
477
}
478
479
136
static void epic_free_pixel_cache(ePICPixHash *hash)
480
{
481
    int i, j;
482
483
34952
    for (i = 0; i < EPIC_HASH_SIZE; i++) {
484
35350
        for (j = 0; j < hash->bucket_fill[i]; j++) {
485
534
            ePICPixListElem *list_elem = hash->bucket[i][j].list;
486
2192
            while (list_elem) {
487
1658
                ePICPixListElem *tmp = list_elem->next;
488
1658
                av_free(list_elem);
489
1658
                list_elem = tmp;
490
            }
491
        }
492
34816
        av_freep(&hash->bucket[i]);
493
34816
        hash->bucket_size[i] =
494
34816
        hash->bucket_fill[i] = 0;
495
    }
496
136
}
497
498
510904
static inline int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
499
{
500
    int i;
501
502
1163688
    for (i = 0; i < dc->stack_pos; i++)
503
806184
        if (dc->stack[i] == pix)
504
153400
            break;
505
506
510904
    return i != dc->stack_pos;
507
}
508
509
#define TOSIGNED(val) (((val) >> 1) ^ -((val) & 1))
510
511
9558
static inline int epic_decode_component_pred(ePICContext *dc,
512
                                             int N, int W, int NW)
513
{
514
9558
    unsigned delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
515
9558
    return mid_pred(N, N + W - NW, W) - TOSIGNED(delta);
516
}
517
518
4739
static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y,
519
                                       const uint32_t *curr_row,
520
                                       const uint32_t *above_row)
521
{
522
    uint32_t N, W, NW, pred;
523
    unsigned delta;
524
    int GN, GW, GNW, R, G, B;
525
526

4739
    if (x && y) {
527
3186
        W  = curr_row[x  - 1];
528
3186
        N  = above_row[x];
529
3186
        NW = above_row[x - 1];
530
531
3186
        GN  = (N  >> G_shift) & 0xFF;
532
3186
        GW  = (W  >> G_shift) & 0xFF;
533
3186
        GNW = (NW >> G_shift) & 0xFF;
534
535
3186
        G = epic_decode_component_pred(dc, GN, GW, GNW);
536
537
6372
        R = G + epic_decode_component_pred(dc,
538
3186
                                           ((N  >> R_shift) & 0xFF) - GN,
539
3186
                                           ((W  >> R_shift) & 0xFF) - GW,
540
3186
                                           ((NW >> R_shift) & 0xFF) - GNW);
541
542
3186
        B = G + epic_decode_component_pred(dc,
543
3186
                                           ((N  >> B_shift) & 0xFF) - GN,
544
3186
                                           ((W  >> B_shift) & 0xFF) - GW,
545
3186
                                           ((NW >> B_shift) & 0xFF) - GNW);
546
    } else {
547
1553
        if (x)
548
471
            pred = curr_row[x - 1];
549
        else
550
1082
            pred = above_row[x];
551
552
1553
        delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
553
1553
        R     = ((pred >> R_shift) & 0xFF) - TOSIGNED(delta);
554
555
1553
        delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
556
1553
        G     = ((pred >> G_shift) & 0xFF) - TOSIGNED(delta);
557
558
1553
        delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
559
1553
        B     = ((pred >> B_shift) & 0xFF) - TOSIGNED(delta);
560
    }
561
562



4739
    if (R<0 || G<0 || B<0 || R > 255 || G > 255 || B > 255) {
563
        avpriv_request_sample(NULL, "RGB %d %d %d is out of range\n", R, G, B);
564
        return 0;
565
    }
566
567
4739
    return (R << R_shift) | (G << G_shift) | (B << B_shift);
568
}
569
570
99449
static int epic_predict_pixel(ePICContext *dc, uint8_t *rung,
571
                              uint32_t *pPix, uint32_t pix)
572
{
573
99449
    if (!ff_els_decode_bit(&dc->els_ctx, rung)) {
574
91084
        *pPix = pix;
575
91084
        return 1;
576
    }
577
8365
    dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
578
8365
    return 0;
579
}
580
581
95756
static int epic_handle_edges(ePICContext *dc, int x, int y,
582
                             const uint32_t *curr_row,
583
                             const uint32_t *above_row, uint32_t *pPix)
584
{
585
    uint32_t pix;
586
587

95756
    if (!x && !y) { /* special case: top-left pixel */
588
        /* the top-left pixel is coded independently with 3 unsigned numbers */
589
136
        *pPix = (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << R_shift) |
590
136
                (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << G_shift) |
591
136
                (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << B_shift);
592
136
        return 1;
593
    }
594
595
95620
    if (x) { /* predict from W first */
596
78572
        pix = curr_row[x - 1];
597
78572
        if (epic_predict_pixel(dc, &dc->W_flag_rung, pPix, pix))
598
72049
            return 1;
599
    }
600
601
23571
    if (y) { /* then try to predict from N */
602
22080
        pix = above_row[x];
603

22080
        if (!dc->stack_pos || dc->stack[0] != pix) {
604
20877
            if (epic_predict_pixel(dc, &dc->N_flag_rung, pPix, pix))
605
19035
                return 1;
606
        }
607
    }
608
609
4536
    return 0;
610
}
611
612
218240
static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width,
613
                                  const uint32_t *curr_row,
614
                                  const uint32_t *above_row,
615
                                  const uint32_t *above2_row,
616
                                  uint32_t *pPix, int *pRun)
617
{
618
218240
    int idx, got_pixel = 0, WWneW, old_WWneW = 0;
619
    uint32_t W, WW, N, NN, NW, NE, NWW, NNW, NNE;
620
621
218240
    *pRun = 0;
622
623
218240
    LOAD_NEIGHBOURS(x);
624
625
218240
    if (dc->next_run_pos == x) {
626
        /* can't reuse W for the new pixel in this case */
627
199455
        WWneW = 1;
628
    } else {
629
18785
        idx = (WW  != W)  << 7 |
630
18785
              (NW  != W)  << 6 |
631
18785
              (N   != NE) << 5 |
632
18785
              (NW  != N)  << 4 |
633
18785
              (NWW != NW) << 3 |
634
18785
              (NNE != NE) << 2 |
635
18785
              (NN  != N)  << 1 |
636
18785
              (NNW != NW);
637
18785
        WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
638
18785
        if (WWneW < 0)
639
            return WWneW;
640
    }
641
642
218240
    if (WWneW)
643
201691
        dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = W;
644
    else {
645
16549
        *pPix     = W;
646
16549
        got_pixel = 1;
647
    }
648
649
    do {
650
503572
        int NWneW = 1;
651
503572
        if (got_pixel) // pixel value already known (derived from either W or N)
652
237740
            NWneW = *pPix != N;
653
        else { // pixel value is unknown and will be decoded later
654
265832
            NWneW = *pRun ? NWneW : NW != W;
655
656
            /* TODO: RFC this mess! */
657

265832
            switch (((NW != N) << 2) | (NWneW << 1) | WWneW) {
658
            case 0:
659
                break; // do nothing here
660
176548
            case 3:
661
            case 5:
662
            case 6:
663
            case 7:
664
176548
                if (!is_pixel_on_stack(dc, N)) {
665
457674
                    idx = WWneW       << 8 |
666

152558
                          (*pRun ? old_WWneW : WW != W) << 7 |
667
305116
                          NWneW       << 6 |
668
152558
                          (N   != NE) << 5 |
669
152558
                          (NW  != N)  << 4 |
670
152558
                          (NWW != NW) << 3 |
671
152558
                          (NNE != NE) << 2 |
672
152558
                          (NN  != N)  << 1 |
673
152558
                          (NNW != NW);
674
152558
                    if (!ff_els_decode_bit(&dc->els_ctx, &dc->N_ctx_rung[idx])) {
675
129319
                        NWneW = 0;
676
129319
                        *pPix = N;
677
129319
                        got_pixel = 1;
678
129319
                        break;
679
                    }
680
                }
681
                /* fall through */
682
            default:
683
136513
                NWneW = 1;
684
136513
                old_WWneW = WWneW;
685
136513
                if (!is_pixel_on_stack(dc, N))
686
23239
                    dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = N;
687
            }
688
        }
689
690
503572
        (*pRun)++;
691
503572
        if (x + *pRun >= tile_width - 1)
692
3378
            break;
693
694
500194
        UPDATE_NEIGHBOURS(x + *pRun);
695
696

500194
        if (!NWneW && NW == N && N == NE) {
697
            int pos, run, rle;
698
99184
            int start_pos = x + *pRun;
699
700
            /* scan for a run of pix in the line above */
701
99184
            uint32_t pix = above_row[start_pos + 1];
702
2511691
            for (pos = start_pos + 2; pos < tile_width; pos++)
703
2496269
                if (!(above_row[pos] == pix))
704
83762
                    break;
705
99184
            run = pos - start_pos - 1;
706
99184
            idx = av_ceil_log2(run);
707
99184
            if (ff_els_decode_bit(&dc->els_ctx, &dc->prev_row_rung[idx]))
708
66738
                *pRun += run;
709
            else {
710
                int flag;
711
                /* run-length is coded as plain binary number of idx - 1 bits */
712
131763
                for (pos = idx - 1, rle = 0, flag = 0; pos >= 0; pos--) {
713

193930
                    if ((1 << pos) + rle < run &&
714
94613
                        ff_els_decode_bit(&dc->els_ctx,
715
                                          flag ? &dc->runlen_one
716
                                               : &dc->runlen_zeroes[pos])) {
717
33844
                        flag = 1;
718
33844
                        rle |= 1 << pos;
719
                    }
720
                }
721
32446
                *pRun += rle;
722
32446
                break; // return immediately
723
            }
724
66738
            if (x + *pRun >= tile_width - 1)
725
13519
                break;
726
727
53219
            LOAD_NEIGHBOURS(x + *pRun);
728
53219
            WWneW = 0;
729
53219
            NWneW = 0;
730
        }
731
732
908458
        idx = WWneW       << 7 |
733
908458
              NWneW       << 6 |
734
454229
              (N   != NE) << 5 |
735
454229
              (NW  != N)  << 4 |
736
454229
              (NWW != NW) << 3 |
737
454229
              (NNE != NE) << 2 |
738
454229
              (NN  != N)  << 1 |
739
454229
              (NNW != NW);
740
454229
        WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
741
454229
    } while (!WWneW);
742
743
218240
    dc->next_run_pos = x + *pRun;
744
218240
    return got_pixel;
745
}
746
747
36049
static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung,
748
                               uint32_t *pPix, uint32_t pix)
749
{
750
36049
    if (ff_els_decode_bit(&dc->els_ctx, rung)) {
751
22192
        *pPix = pix;
752
22192
        return 1;
753
    }
754
13857
    dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
755
13857
    return 0;
756
}
757
758
76908
static int epic_predict_from_NW_NE(ePICContext *dc, int x, int y, int run,
759
                                   int tile_width, const uint32_t *curr_row,
760
                                   const uint32_t *above_row, uint32_t *pPix)
761
{
762
    int pos;
763
764
    /* try to reuse the NW pixel first */
765

76908
    if (x && y) {
766
73974
        uint32_t NW = above_row[x - 1];
767

73974
        if (NW != curr_row[x - 1] && NW != above_row[x] && !is_pixel_on_stack(dc, NW)) {
768
20189
            if (epic_predict_pixel2(dc, &dc->nw_pred_rung[NW & 0xFF], pPix, NW))
769
12191
                return 1;
770
        }
771
    }
772
773
    /* try to reuse the NE[x + run, y] pixel */
774
64717
    pos = x + run - 1;
775

64717
    if (pos < tile_width - 1 && y) {
776
62826
        uint32_t NE = above_row[pos + 1];
777

62826
        if (NE != above_row[pos] && !is_pixel_on_stack(dc, NE)) {
778
15860
            if (epic_predict_pixel2(dc, &dc->ne_pred_rung[NE & 0xFF], pPix, NE))
779
10001
                return 1;
780
        }
781
    }
782
783
54716
    return 0;
784
}
785
786
53634
static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix)
787
{
788
53634
    ePICPixListElem *list, *prev = NULL;
789
53634
    ePICPixHashElem *hash_elem = epic_hash_find(&dc->hash, W);
790
791

53634
    if (!hash_elem || !hash_elem->list)
792
534
        return 0;
793
794
53100
    list = hash_elem->list;
795
154706
    while (list) {
796
153582
        if (!is_pixel_on_stack(dc, list->pixel)) {
797
142918
            if (ff_els_decode_bit(&dc->els_ctx, &list->rung)) {
798
51976
                *pPix = list->pixel;
799
51976
                if (list != hash_elem->list) {
800
36609
                    prev->next      = list->next;
801
36609
                    list->next      = hash_elem->list;
802
36609
                    hash_elem->list = list;
803
                }
804
51976
                return 1;
805
            }
806
90942
            dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = list->pixel;
807
        }
808
101606
        prev = list;
809
101606
        list = list->next;
810
    }
811
812
1124
    return 0;
813
}
814
815
136
static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height,
816
                            int tile_width, int stride)
817
{
818
    int x, y;
819
    uint32_t pix;
820
136
    uint32_t *curr_row = NULL, *above_row = NULL, *above2_row;
821
822
17320
    for (y = 0; y < tile_height; y++, out += stride) {
823
17184
        above2_row = above_row;
824
17184
        above_row  = curr_row;
825
17184
        curr_row   = (uint32_t *) out;
826
827
333179
        for (x = 0, dc->next_run_pos = 0; x < tile_width;) {
828
315995
            if (dc->els_ctx.err)
829
                return AVERROR_INVALIDDATA; // bail out in the case of ELS overflow
830
831
315995
            pix = curr_row[x - 1]; // get W pixel
832
833

315995
            if (y >= 1 && x >= 2 &&
834

259371
                pix != curr_row[x - 2]  && pix != above_row[x - 1] &&
835

101123
                pix != above_row[x - 2] && pix != above_row[x] &&
836
41955
                !epic_cache_entries_for_pixel(&dc->hash, pix)) {
837
1999
                curr_row[x] = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
838
1999
                x++;
839
            } else {
840
                int got_pixel, run;
841
313996
                dc->stack_pos = 0; // empty stack
842
843

313996
                if (y < 2 || x < 2 || x == tile_width - 1) {
844
95756
                    run       = 1;
845
95756
                    got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix);
846
                } else {
847
218240
                    got_pixel = epic_decode_run_length(dc, x, y, tile_width,
848
                                                       curr_row, above_row,
849
                                                       above2_row, &pix, &run);
850
218240
                    if (got_pixel < 0)
851
                        return got_pixel;
852
                }
853
854

313996
                if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run,
855
                                                           tile_width, curr_row,
856
                                                           above_row, &pix)) {
857
54716
                    uint32_t ref_pix = curr_row[x - 1];
858

54716
                    if (!x || !epic_decode_from_cache(dc, ref_pix, &pix)) {
859
2740
                        pix = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
860
2740
                        if (is_pixel_on_stack(dc, pix))
861
                            return AVERROR_INVALIDDATA;
862
863
2740
                        if (x) {
864
1658
                            int ret = epic_add_pixel_to_cache(&dc->hash,
865
                                                              ref_pix,
866
                                                              pix);
867
1658
                            if (ret)
868
                                return ret;
869
                        }
870
                    }
871
                }
872
3159741
                for (; run > 0; x++, run--)
873
2845745
                    curr_row[x] = pix;
874
            }
875
        }
876
    }
877
878
136
    return 0;
879
}
880
881
136
static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y,
882
                               const uint8_t *src, size_t src_size,
883
                               AVCodecContext *avctx)
884
{
885
136
    uint8_t prefix, mask = 0x80;
886
    int extrabytes, tile_width, tile_height, awidth, aheight;
887
    size_t els_dsize;
888
    uint8_t *dst;
889
890
136
    if (!src_size)
891
        return 0;
892
893
    /* get data size of the ELS partition as unsigned variable-length integer */
894
136
    prefix = *src++;
895
136
    src_size--;
896

224
    for (extrabytes = 0; (prefix & mask) && (extrabytes < 7); extrabytes++)
897
88
        mask >>= 1;
898

136
    if (extrabytes > 3 || src_size < extrabytes) {
899
        av_log(avctx, AV_LOG_ERROR, "ePIC: invalid data size VLI\n");
900
        return AVERROR_INVALIDDATA;
901
    }
902
903
136
    els_dsize = prefix & ((0x80 >> extrabytes) - 1); // mask out the length prefix
904
224
    while (extrabytes-- > 0) {
905
88
        els_dsize = (els_dsize << 8) | *src++;
906
88
        src_size--;
907
    }
908
909
136
    if (src_size < els_dsize) {
910
        av_log(avctx, AV_LOG_ERROR, "ePIC: data too short, needed %"SIZE_SPECIFIER", got %"SIZE_SPECIFIER"\n",
911
               els_dsize, src_size);
912
        return AVERROR_INVALIDDATA;
913
    }
914
915
136
    tile_width  = FFMIN(c->width  - tile_x * c->tile_width,  c->tile_width);
916
136
    tile_height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
917
136
    awidth      = FFALIGN(tile_width,  16);
918
136
    aheight     = FFALIGN(tile_height, 16);
919
920
136
    if (els_dsize) {
921
        int ret, i, j, k;
922
        uint8_t tr_r, tr_g, tr_b, *buf;
923
        uint32_t *in;
924
        /* ELS decoder initializations */
925
136
        memset(&c->ec, 0, sizeof(c->ec));
926
136
        ff_els_decoder_init(&c->ec.els_ctx, src, els_dsize);
927
136
        epic_hash_init(&c->ec.hash);
928
929
        /* decode transparent pixel value */
930
136
        tr_r = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
931
136
        tr_g = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
932
136
        tr_b = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
933
136
        if (c->ec.els_ctx.err != 0) {
934
            av_log(avctx, AV_LOG_ERROR,
935
                   "ePIC: couldn't decode transparency pixel!\n");
936
            ff_els_decoder_uninit(&c->ec.unsigned_rung);
937
            return AVERROR_INVALIDDATA;
938
        }
939
940
136
        ret = epic_decode_tile(&c->ec, c->epic_buf, tile_height, tile_width,
941
                               c->epic_buf_stride);
942
943
136
        epic_free_pixel_cache(&c->ec.hash);
944
136
        ff_els_decoder_uninit(&c->ec.unsigned_rung);
945
946
136
        if (ret) {
947
            av_log(avctx, AV_LOG_ERROR,
948
                   "ePIC: tile decoding failed, frame=%d, tile_x=%d, tile_y=%d\n",
949
                   avctx->frame_number, tile_x, tile_y);
950
            return AVERROR_INVALIDDATA;
951
        }
952
953
136
        buf = c->epic_buf;
954
136
        dst = c->framebuf + tile_x * c->tile_width * 3 +
955
136
              tile_y * c->tile_height * c->framebuf_stride;
956
957
17320
        for (j = 0; j < tile_height; j++) {
958
17184
            uint8_t *out = dst;
959
17184
            in  = (uint32_t *) buf;
960
2864928
            for (i = 0; i < tile_width; i++) {
961
2847744
                out[0] = (in[i] >> R_shift) & 0xFF;
962
2847744
                out[1] = (in[i] >> G_shift) & 0xFF;
963
2847744
                out[2] = (in[i] >> B_shift) & 0xFF;
964
2847744
                out   += 3;
965
            }
966
17184
            buf += c->epic_buf_stride;
967
17184
            dst += c->framebuf_stride;
968
        }
969
970
136
        if (src_size > els_dsize) {
971
            uint8_t *jpg;
972
            uint32_t tr;
973
92
            int bstride = FFALIGN(tile_width, 16) >> 3;
974
92
            int nblocks = 0;
975
92
            int estride = c->epic_buf_stride >> 2;
976
977
92
            src      += els_dsize;
978
92
            src_size -= els_dsize;
979
980
92
            in = (uint32_t *) c->epic_buf;
981
92
            tr = (tr_r << R_shift) | (tr_g << G_shift) | (tr_b << B_shift);
982
983
92
            memset(c->kempf_flags, 0,
984
92
                   (aheight >> 3) * bstride * sizeof(*c->kempf_flags));
985
1543
            for (j = 0; j < tile_height; j += 8) {
986
32605
                for (i = 0; i < tile_width; i += 8) {
987
31154
                    c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 0;
988
1113006
                    for (k = 0; k < 8 * 8; k++) {
989
1096594
                        if (in[i + (k & 7) + (k >> 3) * estride] == tr) {
990
14742
                            c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 1;
991
14742
                            nblocks++;
992
14742
                            break;
993
                        }
994
                    }
995
                }
996
1451
                in += 8 * estride;
997
            }
998
999
92
            memset(c->jpeg_tile, 0, c->tile_stride * aheight);
1000
92
            jpg_decode_data(&c->jc, awidth, aheight, src, src_size,
1001
                            c->jpeg_tile, c->tile_stride,
1002
92
                            c->kempf_flags, bstride, nblocks, c->swapuv);
1003
1004
92
            in  = (uint32_t *) c->epic_buf;
1005
92
            dst = c->framebuf + tile_x * c->tile_width * 3 +
1006
92
                  tile_y * c->tile_height * c->framebuf_stride;
1007
92
            jpg = c->jpeg_tile;
1008
11672
            for (j = 0; j < tile_height; j++) {
1009
2000508
                for (i = 0; i < tile_width; i++)
1010
1988928
                    if (in[i] == tr)
1011
717442
                        memcpy(dst + i * 3, jpg + i * 3, 3);
1012
11580
                in  += c->epic_buf_stride >> 2;
1013
11580
                dst += c->framebuf_stride;
1014
11580
                jpg += c->tile_stride;
1015
            }
1016
        }
1017
    } else {
1018
        dst = c->framebuf + tile_x * c->tile_width * 3 +
1019
              tile_y * c->tile_height * c->framebuf_stride;
1020
        return jpg_decode_data(&c->jc, tile_width, tile_height, src, src_size,
1021
                               dst, c->framebuf_stride, NULL, 0, 0, c->swapuv);
1022
    }
1023
1024
136
    return 0;
1025
}
1026
1027
81
static int kempf_restore_buf(const uint8_t *src, int len,
1028
                              uint8_t *dst, int stride,
1029
                              const uint8_t *jpeg_tile, int tile_stride,
1030
                              int width, int height,
1031
                              const uint8_t *pal, int npal, int tidx)
1032
{
1033
    GetBitContext gb;
1034
    int i, j, nb, col;
1035
    int ret;
1036
81
    int align_width = FFALIGN(width, 16);
1037
1038
81
    if ((ret = init_get_bits8(&gb, src, len)) < 0)
1039
        return ret;
1040
1041
81
    if (npal <= 2)       nb = 1;
1042
81
    else if (npal <= 4)  nb = 2;
1043
66
    else if (npal <= 16) nb = 4;
1044
29
    else                 nb = 8;
1045
1046
10449
    for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
1047
10368
        if (get_bits(&gb, 8))
1048
            continue;
1049
1654912
        for (i = 0; i < width; i++) {
1050
1644544
            col = get_bits(&gb, nb);
1051
1644544
            if (col != tidx)
1052
1323579
                memcpy(dst + i * 3, pal + col * 3, 3);
1053
            else
1054
320965
                memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
1055
        }
1056
10368
        skip_bits_long(&gb, nb * (align_width - width));
1057
    }
1058
1059
81
    return 0;
1060
}
1061
1062
101
static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
1063
                             const uint8_t *src, int src_size)
1064
{
1065
    int width, height;
1066
101
    int hdr, zsize, npal, tidx = -1, ret;
1067
    int i, j;
1068
101
    const uint8_t *src_end = src + src_size;
1069
    uint8_t pal[768], transp[3];
1070
101
    uLongf dlen = (c->tile_width + 1) * c->tile_height;
1071
    int sub_type;
1072
    int nblocks, cblocks, bstride;
1073
    int bits, bitbuf, coded;
1074
101
    uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
1075
101
                   tile_y * c->tile_height * c->framebuf_stride;
1076
1077
101
    if (src_size < 2)
1078
        return AVERROR_INVALIDDATA;
1079
1080
101
    width  = FFMIN(c->width  - tile_x * c->tile_width,  c->tile_width);
1081
101
    height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
1082
1083
101
    hdr      = *src++;
1084
101
    sub_type = hdr >> 5;
1085
101
    if (sub_type == 0) {
1086
        int j;
1087
20
        memcpy(transp, src, 3);
1088
20
        src += 3;
1089
2580
        for (j = 0; j < height; j++, dst += c->framebuf_stride)
1090
403968
            for (i = 0; i < width; i++)
1091
401408
                memcpy(dst + i * 3, transp, 3);
1092
20
        return 0;
1093
81
    } else if (sub_type == 1) {
1094
        return jpg_decode_data(&c->jc, width, height, src, src_end - src,
1095
                               dst, c->framebuf_stride, NULL, 0, 0, 0);
1096
    }
1097
1098
81
    if (sub_type != 2) {
1099
67
        memcpy(transp, src, 3);
1100
67
        src += 3;
1101
    }
1102
81
    npal = *src++ + 1;
1103
81
    if (src_end - src < npal * 3)
1104
        return AVERROR_INVALIDDATA;
1105
81
    memcpy(pal, src, npal * 3);
1106
81
    src += npal * 3;
1107
81
    if (sub_type != 2) {
1108
134
        for (i = 0; i < npal; i++) {
1109
134
            if (!memcmp(pal + i * 3, transp, 3)) {
1110
67
                tidx = i;
1111
67
                break;
1112
            }
1113
        }
1114
    }
1115
1116
81
    if (src_end - src < 2)
1117
        return 0;
1118
81
    zsize = (src[0] << 8) | src[1];
1119
81
    src  += 2;
1120
1121
81
    if (src_end - src < zsize + (sub_type != 2))
1122
        return AVERROR_INVALIDDATA;
1123
1124
81
    ret = uncompress(c->kempf_buf, &dlen, src, zsize);
1125
81
    if (ret)
1126
        return AVERROR_INVALIDDATA;
1127
81
    src += zsize;
1128
1129
81
    if (sub_type == 2) {
1130
14
        kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1131
                          NULL, 0, width, height, pal, npal, tidx);
1132
14
        return 0;
1133
    }
1134
1135
67
    nblocks = *src++ + 1;
1136
67
    cblocks = 0;
1137
67
    bstride = FFALIGN(width, 16) >> 3;
1138
    // blocks are coded LSB and we need normal bitreader for JPEG data
1139
67
    bits = 0;
1140
603
    for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
1141
5984
        for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
1142
5448
            if (!bits) {
1143
681
                if (src >= src_end)
1144
                    return AVERROR_INVALIDDATA;
1145
681
                bitbuf = *src++;
1146
681
                bits   = 8;
1147
            }
1148
5448
            coded = bitbuf & 1;
1149
5448
            bits--;
1150
5448
            bitbuf >>= 1;
1151
5448
            cblocks += coded;
1152
5448
            if (cblocks > nblocks)
1153
                return AVERROR_INVALIDDATA;
1154
5448
            c->kempf_flags[j * 2 +      i * 2      * bstride] =
1155
5448
            c->kempf_flags[j * 2 + 1 +  i * 2      * bstride] =
1156
5448
            c->kempf_flags[j * 2 +     (i * 2 + 1) * bstride] =
1157
5448
            c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
1158
        }
1159
    }
1160
1161
67
    memset(c->jpeg_tile, 0, c->tile_stride * height);
1162
67
    jpg_decode_data(&c->jc, width, height, src, src_end - src,
1163
                    c->jpeg_tile, c->tile_stride,
1164
67
                    c->kempf_flags, bstride, nblocks * 4, 0);
1165
1166
67
    kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1167
67
                      c->jpeg_tile, c->tile_stride,
1168
                      width, height, pal, npal, tidx);
1169
1170
67
    return 0;
1171
}
1172
1173
4
static int g2m_init_buffers(G2MContext *c)
1174
{
1175
    int aligned_height;
1176
1177

4
    if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
1178
4
        c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
1179
4
        aligned_height     = c->height + 15;
1180
4
        av_free(c->framebuf);
1181
4
        c->framebuf = av_mallocz_array(c->framebuf_stride, aligned_height);
1182
4
        if (!c->framebuf)
1183
            return AVERROR(ENOMEM);
1184
    }
1185

4
    if (!c->synth_tile || !c->jpeg_tile ||
1186

1
        (c->compression == 2 && !c->epic_buf_base) ||
1187
1
        c->old_tile_w < c->tile_width ||
1188
        c->old_tile_h < c->tile_height) {
1189
4
        c->tile_stride     = FFALIGN(c->tile_width, 16) * 3;
1190
4
        c->epic_buf_stride = FFALIGN(c->tile_width * 4, 16);
1191
4
        aligned_height     = FFALIGN(c->tile_height,    16);
1192
4
        av_freep(&c->synth_tile);
1193
4
        av_freep(&c->jpeg_tile);
1194
4
        av_freep(&c->kempf_buf);
1195
4
        av_freep(&c->kempf_flags);
1196
4
        av_freep(&c->epic_buf_base);
1197
4
        c->epic_buf    = NULL;
1198
4
        c->synth_tile  = av_mallocz(c->tile_stride      * aligned_height);
1199
4
        c->jpeg_tile   = av_mallocz(c->tile_stride      * aligned_height);
1200
4
        c->kempf_buf   = av_mallocz((c->tile_width + 1) * aligned_height +
1201
                                    AV_INPUT_BUFFER_PADDING_SIZE);
1202
4
        c->kempf_flags = av_mallocz(c->tile_width       * aligned_height);
1203

4
        if (!c->synth_tile || !c->jpeg_tile ||
1204

4
            !c->kempf_buf || !c->kempf_flags)
1205
            return AVERROR(ENOMEM);
1206
4
        if (c->compression == 2) {
1207
3
            c->epic_buf_base = av_mallocz(c->epic_buf_stride * aligned_height + 4);
1208
3
            if (!c->epic_buf_base)
1209
                return AVERROR(ENOMEM);
1210
3
            c->epic_buf = c->epic_buf_base + 4;
1211
        }
1212
    }
1213
1214
4
    return 0;
1215
}
1216
1217
14
static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
1218
                           GetByteContext *gb)
1219
{
1220
    int i, j, k;
1221
    uint8_t *dst;
1222
    uint32_t bits;
1223
    uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
1224
    uint32_t cursor_hot_x, cursor_hot_y;
1225
    int cursor_fmt, err;
1226
1227
14
    cur_size     = bytestream2_get_be32(gb);
1228
14
    cursor_w     = bytestream2_get_byte(gb);
1229
14
    cursor_h     = bytestream2_get_byte(gb);
1230
14
    cursor_hot_x = bytestream2_get_byte(gb);
1231
14
    cursor_hot_y = bytestream2_get_byte(gb);
1232
14
    cursor_fmt   = bytestream2_get_byte(gb);
1233
1234

14
    cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
1235
1236

14
    if (cursor_w < 1 || cursor_w > 256 ||
1237
14
        cursor_h < 1 || cursor_h > 256) {
1238
        av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
1239
               cursor_w, cursor_h);
1240
        return AVERROR_INVALIDDATA;
1241
    }
1242

14
    if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
1243
        av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
1244
               cursor_hot_x, cursor_hot_y);
1245
        cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
1246
        cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
1247
    }
1248
14
    if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
1249
14
        c->cursor_w * c->cursor_h / 4 > cur_size) {
1250
        av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
1251
               cur_size, bytestream2_get_bytes_left(gb));
1252
        return AVERROR_INVALIDDATA;
1253
    }
1254

14
    if (cursor_fmt != 1 && cursor_fmt != 32) {
1255
        avpriv_report_missing_feature(avctx, "Cursor format %d",
1256
                                      cursor_fmt);
1257
        return AVERROR_PATCHWELCOME;
1258
    }
1259
1260
14
    if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
1261
        av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
1262
        return err;
1263
    }
1264
1265
14
    c->cursor_w      = cursor_w;
1266
14
    c->cursor_h      = cursor_h;
1267
14
    c->cursor_hot_x  = cursor_hot_x;
1268
14
    c->cursor_hot_y  = cursor_hot_y;
1269
14
    c->cursor_fmt    = cursor_fmt;
1270
14
    c->cursor_stride = cursor_stride;
1271
1272
14
    dst = c->cursor;
1273
14
    switch (c->cursor_fmt) {
1274
13
    case 1: // old monochrome
1275
429
        for (j = 0; j < c->cursor_h; j++) {
1276
832
            for (i = 0; i < c->cursor_w; i += 32) {
1277
416
                bits = bytestream2_get_be32(gb);
1278
13728
                for (k = 0; k < 32; k++) {
1279
13312
                    dst[0] = !!(bits & 0x80000000);
1280
13312
                    dst   += 4;
1281
13312
                    bits <<= 1;
1282
                }
1283
            }
1284
        }
1285
1286
13
        dst = c->cursor;
1287
429
        for (j = 0; j < c->cursor_h; j++) {
1288
832
            for (i = 0; i < c->cursor_w; i += 32) {
1289
416
                bits = bytestream2_get_be32(gb);
1290
13728
                for (k = 0; k < 32; k++) {
1291
13312
                    int mask_bit = !!(bits & 0x80000000);
1292
13312
                    switch (dst[0] * 2 + mask_bit) {
1293
824
                    case 0:
1294
824
                        dst[0] = 0xFF;
1295
824
                        dst[1] = 0x00;
1296
824
                        dst[2] = 0x00;
1297
824
                        dst[3] = 0x00;
1298
824
                        break;
1299
920
                    case 1:
1300
920
                        dst[0] = 0xFF;
1301
920
                        dst[1] = 0xFF;
1302
920
                        dst[2] = 0xFF;
1303
920
                        dst[3] = 0xFF;
1304
920
                        break;
1305
11568
                    default:
1306
11568
                        dst[0] = 0x00;
1307
11568
                        dst[1] = 0x00;
1308
11568
                        dst[2] = 0x00;
1309
11568
                        dst[3] = 0x00;
1310
                    }
1311
13312
                    dst   += 4;
1312
13312
                    bits <<= 1;
1313
                }
1314
            }
1315
        }
1316
13
        break;
1317
1
    case 32: // full colour
1318
        /* skip monochrome version of the cursor and decode RGBA instead */
1319
1
        bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
1320
33
        for (j = 0; j < c->cursor_h; j++) {
1321
1056
            for (i = 0; i < c->cursor_w; i++) {
1322
1024
                int val = bytestream2_get_be32(gb);
1323
1024
                *dst++ = val >>  0;
1324
1024
                *dst++ = val >>  8;
1325
1024
                *dst++ = val >> 16;
1326
1024
                *dst++ = val >> 24;
1327
            }
1328
        }
1329
1
        break;
1330
    default:
1331
        return AVERROR_PATCHWELCOME;
1332
    }
1333
14
    return 0;
1334
}
1335
1336
#define APPLY_ALPHA(src, new, alpha) \
1337
    src = (src * (256 - alpha) + new * alpha) >> 8
1338
1339
247
static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
1340
{
1341
    int i, j;
1342
    int x, y, w, h;
1343
    const uint8_t *cursor;
1344
1345
247
    if (!c->cursor)
1346
        return;
1347
1348
247
    x = c->cursor_x - c->cursor_hot_x;
1349
247
    y = c->cursor_y - c->cursor_hot_y;
1350
1351
247
    cursor = c->cursor;
1352
247
    w      = c->cursor_w;
1353
247
    h      = c->cursor_h;
1354
1355
247
    if (x + w > c->width)
1356
52
        w = c->width - x;
1357
247
    if (y + h > c->height)
1358
        h = c->height - y;
1359
247
    if (x < 0) {
1360
        w      +=  x;
1361
        cursor += -x * 4;
1362
    } else {
1363
247
        dst    +=  x * 3;
1364
    }
1365
1366
247
    if (y < 0)
1367
3
        h      +=  y;
1368

247
    if (w < 0 || h < 0)
1369
        return;
1370
247
    if (y < 0) {
1371
3
        cursor += -y * c->cursor_stride;
1372
    } else {
1373
244
        dst    +=  y * stride;
1374
    }
1375
1376
8133
    for (j = 0; j < h; j++) {
1377
236974
        for (i = 0; i < w; i++) {
1378
229088
            uint8_t alpha = cursor[i * 4];
1379
229088
            APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
1380
229088
            APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
1381
229088
            APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
1382
        }
1383
7886
        dst    += stride;
1384
7886
        cursor += c->cursor_stride;
1385
    }
1386
}
1387
1388
247
static int g2m_decode_frame(AVCodecContext *avctx, void *data,
1389
                            int *got_picture_ptr, AVPacket *avpkt)
1390
{
1391
247
    const uint8_t *buf = avpkt->data;
1392
247
    int buf_size = avpkt->size;
1393
247
    G2MContext *c = avctx->priv_data;
1394
247
    AVFrame *pic = data;
1395
    GetByteContext bc, tbc;
1396
    int magic;
1397
247
    int got_header = 0;
1398
    uint32_t chunk_size, r_mask, g_mask, b_mask;
1399
    int chunk_type, chunk_start;
1400
    int i;
1401
    int ret;
1402
1403
247
    if (buf_size < 12) {
1404
        av_log(avctx, AV_LOG_ERROR,
1405
               "Frame should have at least 12 bytes, got %d instead\n",
1406
               buf_size);
1407
        return AVERROR_INVALIDDATA;
1408
    }
1409
1410
247
    bytestream2_init(&bc, buf, buf_size);
1411
1412
247
    magic = bytestream2_get_be32(&bc);
1413
247
    if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
1414

247
        (magic & 0xF) < 2 || (magic & 0xF) > 5) {
1415
        av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
1416
        return AVERROR_INVALIDDATA;
1417
    }
1418
1419
247
    c->swapuv = magic == MKBETAG('G', '2', 'M', '2');
1420
1421
761
    while (bytestream2_get_bytes_left(&bc) > 5) {
1422
514
        chunk_size  = bytestream2_get_le32(&bc) - 1;
1423
514
        chunk_type  = bytestream2_get_byte(&bc);
1424
514
        chunk_start = bytestream2_tell(&bc);
1425
514
        if (chunk_size > bytestream2_get_bytes_left(&bc)) {
1426
            av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
1427
                   chunk_size, chunk_type);
1428
            break;
1429
        }
1430

514
        switch (chunk_type) {
1431
4
        case DISPLAY_INFO:
1432
4
            got_header =
1433
4
            c->got_header = 0;
1434
4
            if (chunk_size < 21) {
1435
                av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
1436
                       chunk_size);
1437
                break;
1438
            }
1439
4
            c->width  = bytestream2_get_be32(&bc);
1440
4
            c->height = bytestream2_get_be32(&bc);
1441

4
            if (c->width < 16 || c->height < 16) {
1442
                av_log(avctx, AV_LOG_ERROR,
1443
                       "Invalid frame dimensions %dx%d\n",
1444
                       c->width, c->height);
1445
                ret = AVERROR_INVALIDDATA;
1446
                goto header_fail;
1447
            }
1448

4
            if (c->width != avctx->width || c->height != avctx->height) {
1449
                ret = ff_set_dimensions(avctx, c->width, c->height);
1450
                if (ret < 0)
1451
                    goto header_fail;
1452
            }
1453
4
            c->compression = bytestream2_get_be32(&bc);
1454

4
            if (c->compression != 2 && c->compression != 3) {
1455
                avpriv_report_missing_feature(avctx, "Compression method %d",
1456
                                              c->compression);
1457
                ret = AVERROR_PATCHWELCOME;
1458
                goto header_fail;
1459
            }
1460
4
            c->tile_width  = bytestream2_get_be32(&bc);
1461
4
            c->tile_height = bytestream2_get_be32(&bc);
1462

4
            if (c->tile_width <= 0 || c->tile_height <= 0 ||
1463
4
                ((c->tile_width | c->tile_height) & 0xF) ||
1464

8
                c->tile_width * (uint64_t)c->tile_height >= INT_MAX / 4 ||
1465
4
                av_image_check_size2(c->tile_width, c->tile_height, avctx->max_pixels, avctx->pix_fmt, 0, avctx) < 0
1466
            ) {
1467
                av_log(avctx, AV_LOG_ERROR,
1468
                       "Invalid tile dimensions %dx%d\n",
1469
                       c->tile_width, c->tile_height);
1470
                ret = AVERROR_INVALIDDATA;
1471
                goto header_fail;
1472
            }
1473
4
            c->tiles_x = (c->width  + c->tile_width  - 1) / c->tile_width;
1474
4
            c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
1475
4
            c->bpp     = bytestream2_get_byte(&bc);
1476
4
            if (c->bpp == 32) {
1477
4
                if (bytestream2_get_bytes_left(&bc) < 16 ||
1478
4
                    (chunk_size - 21) < 16) {
1479
                    av_log(avctx, AV_LOG_ERROR,
1480
                           "Display info: missing bitmasks!\n");
1481
                    ret = AVERROR_INVALIDDATA;
1482
                    goto header_fail;
1483
                }
1484
4
                r_mask = bytestream2_get_be32(&bc);
1485
4
                g_mask = bytestream2_get_be32(&bc);
1486
4
                b_mask = bytestream2_get_be32(&bc);
1487

4
                if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
1488
                    avpriv_report_missing_feature(avctx,
1489
                                                  "Bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32,
1490
                                                  r_mask, g_mask, b_mask);
1491
                    ret = AVERROR_PATCHWELCOME;
1492
                    goto header_fail;
1493
                }
1494
            } else {
1495
                avpriv_request_sample(avctx, "bpp=%d", c->bpp);
1496
                ret = AVERROR_PATCHWELCOME;
1497
                goto header_fail;
1498
            }
1499
4
            if (g2m_init_buffers(c)) {
1500
                ret = AVERROR(ENOMEM);
1501
                goto header_fail;
1502
            }
1503
4
            got_header = 1;
1504
4
            break;
1505
237
        case TILE_DATA:
1506

237
            if (!c->tiles_x || !c->tiles_y) {
1507
                av_log(avctx, AV_LOG_WARNING,
1508
                       "No display info - skipping tile\n");
1509
                break;
1510
            }
1511
237
            if (chunk_size < 2) {
1512
                av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
1513
                       chunk_size);
1514
                break;
1515
            }
1516
237
            c->tile_x = bytestream2_get_byte(&bc);
1517
237
            c->tile_y = bytestream2_get_byte(&bc);
1518

237
            if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
1519
                av_log(avctx, AV_LOG_ERROR,
1520
                       "Invalid tile pos %d,%d (in %dx%d grid)\n",
1521
                       c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
1522
                break;
1523
            }
1524
237
            ret = 0;
1525
237
            switch (c->compression) {
1526
136
            case COMPR_EPIC_J_B:
1527
272
                ret = epic_jb_decode_tile(c, c->tile_x, c->tile_y,
1528
136
                                          buf + bytestream2_tell(&bc),
1529
136
                                          chunk_size - 2, avctx);
1530
136
                break;
1531
101
            case COMPR_KEMPF_J_B:
1532
202
                ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
1533
101
                                        buf + bytestream2_tell(&bc),
1534
101
                                        chunk_size - 2);
1535
101
                break;
1536
            }
1537

237
            if (ret && c->framebuf)
1538
                av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
1539
                       c->tile_x, c->tile_y);
1540
237
            break;
1541
245
        case CURSOR_POS:
1542
245
            if (chunk_size < 5) {
1543
                av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
1544
                       chunk_size);
1545
                break;
1546
            }
1547
245
            c->cursor_x = bytestream2_get_be16(&bc);
1548
245
            c->cursor_y = bytestream2_get_be16(&bc);
1549
245
            break;
1550
14
        case CURSOR_SHAPE:
1551
14
            if (chunk_size < 8) {
1552
                av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
1553
                       chunk_size);
1554
                break;
1555
            }
1556
14
            bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
1557
14
                             chunk_size - 4);
1558
14
            g2m_load_cursor(avctx, c, &tbc);
1559
14
            break;
1560
14
        case CHUNK_CC:
1561
        case CHUNK_CD:
1562
14
            break;
1563
        default:
1564
            av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
1565
                   chunk_type);
1566
        }
1567
1568
        /* navigate to next chunk */
1569
514
        bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
1570
    }
1571
247
    if (got_header)
1572
4
        c->got_header = 1;
1573
1574

247
    if (c->width && c->height && c->framebuf) {
1575
247
        if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
1576
            return ret;
1577
1578
247
        pic->key_frame = got_header;
1579
247
        pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
1580
1581
210563
        for (i = 0; i < avctx->height; i++)
1582
210316
            memcpy(pic->data[0] + i * pic->linesize[0],
1583
210316
                   c->framebuf + i * c->framebuf_stride,
1584
210316
                   c->width * 3);
1585
247
        g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
1586
1587
247
        *got_picture_ptr = 1;
1588
    }
1589
1590
247
    return buf_size;
1591
1592
header_fail:
1593
    c->width   =
1594
    c->height  = 0;
1595
    c->tiles_x =
1596
    c->tiles_y = 0;
1597
    c->tile_width =
1598
    c->tile_height = 0;
1599
    return ret;
1600
}
1601
1602
6
static av_cold int g2m_decode_init(AVCodecContext *avctx)
1603
{
1604
6
    G2MContext *const c = avctx->priv_data;
1605
    int ret;
1606
1607
6
    if ((ret = jpg_init(avctx, &c->jc)) != 0) {
1608
        av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
1609
        jpg_free_context(&c->jc);
1610
        return AVERROR(ENOMEM);
1611
    }
1612
1613
6
    avctx->pix_fmt = AV_PIX_FMT_RGB24;
1614
1615
    // store original sizes and check against those if resize happens
1616
6
    c->orig_width  = avctx->width;
1617
6
    c->orig_height = avctx->height;
1618
1619
6
    return 0;
1620
}
1621
1622
6
static av_cold int g2m_decode_end(AVCodecContext *avctx)
1623
{
1624
6
    G2MContext *const c = avctx->priv_data;
1625
1626
6
    jpg_free_context(&c->jc);
1627
1628
6
    av_freep(&c->epic_buf_base);
1629
6
    c->epic_buf = NULL;
1630
6
    av_freep(&c->kempf_buf);
1631
6
    av_freep(&c->kempf_flags);
1632
6
    av_freep(&c->synth_tile);
1633
6
    av_freep(&c->jpeg_tile);
1634
6
    av_freep(&c->cursor);
1635
6
    av_freep(&c->framebuf);
1636
1637
6
    return 0;
1638
}
1639
1640
AVCodec ff_g2m_decoder = {
1641
    .name           = "g2m",
1642
    .long_name      = NULL_IF_CONFIG_SMALL("Go2Meeting"),
1643
    .type           = AVMEDIA_TYPE_VIDEO,
1644
    .id             = AV_CODEC_ID_G2M,
1645
    .priv_data_size = sizeof(G2MContext),
1646
    .init           = g2m_decode_init,
1647
    .close          = g2m_decode_end,
1648
    .decode         = g2m_decode_frame,
1649
    .capabilities   = AV_CODEC_CAP_DR1,
1650
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
1651
};