FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/g2meet.c
Date: 2022-07-06 18:02:43
Exec Total Coverage
Lines: 772 900 85.8%
Branches: 474 604 78.5%

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 #include "libavutil/mem_internal.h"
34
35 #include "avcodec.h"
36 #include "blockdsp.h"
37 #include "bytestream.h"
38 #include "codec_internal.h"
39 #include "elsdec.h"
40 #include "get_bits.h"
41 #include "idctdsp.h"
42 #include "internal.h"
43 #include "jpegtables.h"
44 #include "mjpeg.h"
45 #include "mjpegdec.h"
46
47 #define EPIC_PIX_STACK_SIZE 1024
48 #define EPIC_PIX_STACK_MAX (EPIC_PIX_STACK_SIZE - 1)
49
50 enum ChunkType {
51 DISPLAY_INFO = 0xC8,
52 TILE_DATA,
53 CURSOR_POS,
54 CURSOR_SHAPE,
55 CHUNK_CC,
56 CHUNK_CD
57 };
58
59 enum Compression {
60 COMPR_EPIC_J_B = 2,
61 COMPR_KEMPF_J_B,
62 };
63
64 static const uint8_t luma_quant[64] = {
65 8, 6, 5, 8, 12, 20, 26, 31,
66 6, 6, 7, 10, 13, 29, 30, 28,
67 7, 7, 8, 12, 20, 29, 35, 28,
68 7, 9, 11, 15, 26, 44, 40, 31,
69 9, 11, 19, 28, 34, 55, 52, 39,
70 12, 18, 28, 32, 41, 52, 57, 46,
71 25, 32, 39, 44, 52, 61, 60, 51,
72 36, 46, 48, 49, 56, 50, 52, 50
73 };
74
75 static const uint8_t chroma_quant[64] = {
76 9, 9, 12, 24, 50, 50, 50, 50,
77 9, 11, 13, 33, 50, 50, 50, 50,
78 12, 13, 28, 50, 50, 50, 50, 50,
79 24, 33, 50, 50, 50, 50, 50, 50,
80 50, 50, 50, 50, 50, 50, 50, 50,
81 50, 50, 50, 50, 50, 50, 50, 50,
82 50, 50, 50, 50, 50, 50, 50, 50,
83 50, 50, 50, 50, 50, 50, 50, 50,
84 };
85
86 typedef struct ePICPixListElem {
87 struct ePICPixListElem *next;
88 uint32_t pixel;
89 uint8_t rung;
90 } ePICPixListElem;
91
92 typedef struct ePICPixHashElem {
93 uint32_t pix_id;
94 struct ePICPixListElem *list;
95 } ePICPixHashElem;
96
97 #define EPIC_HASH_SIZE 256
98 typedef struct ePICPixHash {
99 ePICPixHashElem *bucket[EPIC_HASH_SIZE];
100 int bucket_size[EPIC_HASH_SIZE];
101 int bucket_fill[EPIC_HASH_SIZE];
102 } ePICPixHash;
103
104 typedef struct ePICContext {
105 ElsDecCtx els_ctx;
106 int next_run_pos;
107 ElsUnsignedRung unsigned_rung;
108 uint8_t W_flag_rung;
109 uint8_t N_flag_rung;
110 uint8_t W_ctx_rung[256];
111 uint8_t N_ctx_rung[512];
112 uint8_t nw_pred_rung[256];
113 uint8_t ne_pred_rung[256];
114 uint8_t prev_row_rung[14];
115 uint8_t runlen_zeroes[14];
116 uint8_t runlen_one;
117 int stack_pos;
118 uint32_t stack[EPIC_PIX_STACK_SIZE];
119 ePICPixHash hash;
120 } ePICContext;
121
122 typedef struct JPGContext {
123 BlockDSPContext bdsp;
124 IDCTDSPContext idsp;
125 ScanTable scantable;
126
127 VLC dc_vlc[2], ac_vlc[2];
128 int prev_dc[3];
129 DECLARE_ALIGNED(32, int16_t, block)[6][64];
130
131 uint8_t *buf;
132 } JPGContext;
133
134 typedef struct G2MContext {
135 ePICContext ec;
136 JPGContext jc;
137
138 int version;
139
140 int compression;
141 int width, height, bpp;
142 int orig_width, orig_height;
143 int tile_width, tile_height;
144 int tiles_x, tiles_y, tile_x, tile_y;
145
146 int got_header;
147
148 uint8_t *framebuf;
149 int framebuf_stride, old_width, old_height;
150
151 uint8_t *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base;
152 int tile_stride, epic_buf_stride, old_tile_w, old_tile_h;
153 int swapuv;
154
155 uint8_t *kempf_buf, *kempf_flags;
156
157 uint8_t *cursor;
158 int cursor_stride;
159 int cursor_fmt;
160 int cursor_w, cursor_h, cursor_x, cursor_y;
161 int cursor_hot_x, cursor_hot_y;
162 } G2MContext;
163
164 6 static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
165 {
166 int ret;
167
168 6 ret = ff_mjpeg_build_vlc(&c->dc_vlc[0], ff_mjpeg_bits_dc_luminance,
169 ff_mjpeg_val_dc, 0, avctx);
170
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6 if (ret)
171 return ret;
172 6 ret = ff_mjpeg_build_vlc(&c->dc_vlc[1], ff_mjpeg_bits_dc_chrominance,
173 ff_mjpeg_val_dc, 0, avctx);
174
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6 if (ret)
175 return ret;
176 6 ret = ff_mjpeg_build_vlc(&c->ac_vlc[0], ff_mjpeg_bits_ac_luminance,
177 ff_mjpeg_val_ac_luminance, 1, avctx);
178
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6 if (ret)
179 return ret;
180 6 ret = ff_mjpeg_build_vlc(&c->ac_vlc[1], ff_mjpeg_bits_ac_chrominance,
181 ff_mjpeg_val_ac_chrominance, 1, avctx);
182
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6 if (ret)
183 return ret;
184
185 6 ff_blockdsp_init(&c->bdsp, avctx);
186 6 ff_idctdsp_init(&c->idsp, avctx);
187 6 ff_init_scantable(c->idsp.idct_permutation, &c->scantable,
188 ff_zigzag_direct);
189
190 6 return 0;
191 }
192
193 6 static av_cold void jpg_free_context(JPGContext *ctx)
194 {
195 int i;
196
197
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18 for (i = 0; i < 2; i++) {
198 12 ff_free_vlc(&ctx->dc_vlc[i]);
199 12 ff_free_vlc(&ctx->ac_vlc[i]);
200 }
201
202 6 av_freep(&ctx->buf);
203 6 }
204
205 159 static void jpg_unescape(const uint8_t *src, int src_size,
206 uint8_t *dst, int *dst_size)
207 {
208 159 const uint8_t *src_end = src + src_size;
209 159 uint8_t *dst_start = dst;
210
211
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155218 while (src < src_end) {
212 155059 uint8_t x = *src++;
213
214 155059 *dst++ = x;
215
216
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155059 if (x == 0xFF && !*src)
217 893 src++;
218 }
219 159 *dst_size = dst - dst_start;
220 159 }
221
222 38284 static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
223 int plane, int16_t *block)
224 {
225 int dc, val, pos;
226 38284 const int is_chroma = !!plane;
227
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38284 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
228
229
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38284 if (get_bits_left(gb) < 1)
230 return AVERROR_INVALIDDATA;
231
232 38284 c->bdsp.clear_block(block);
233 38284 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 2);
234
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38284 if (dc < 0)
235 return AVERROR_INVALIDDATA;
236
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38284 if (dc)
237 22214 dc = get_xbits(gb, dc);
238 38284 dc = dc * qmat[0] + c->prev_dc[plane];
239 38284 block[0] = dc;
240 38284 c->prev_dc[plane] = dc;
241
242 38284 pos = 0;
243
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225358 while (pos < 63) {
244 224976 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 2);
245
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224976 if (val < 0)
246 return AVERROR_INVALIDDATA;
247 224976 pos += val >> 4;
248 224976 val &= 0xF;
249
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224976 if (pos > 63)
250
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37902 return val ? AVERROR_INVALIDDATA : 0;
251
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187074 if (val) {
252 186680 int nbits = val;
253
254 186680 val = get_xbits(gb, nbits);
255 186680 val *= qmat[ff_zigzag_direct[pos]];
256 186680 block[c->scantable.permutated[pos]] = val;
257 }
258 }
259 382 return 0;
260 }
261
262 1684224 static inline void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
263 {
264 1684224 out[ridx] = av_clip_uint8(Y + (91881 * V + 32768 >> 16));
265 1684224 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
266 1684224 out[2 - ridx] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
267 1684224 }
268
269 159 static int jpg_decode_data(JPGContext *c, int width, int height,
270 const uint8_t *src, int src_size,
271 uint8_t *dst, int dst_stride,
272 const uint8_t *mask, int mask_stride, int num_mbs,
273 int swapuv)
274 {
275 GetBitContext gb;
276 int mb_w, mb_h, mb_x, mb_y, i, j;
277 int bx, by;
278 int unesc_size;
279 int ret;
280
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159 const int ridx = swapuv ? 2 : 0;
281
282
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159 if ((ret = av_reallocp(&c->buf,
283 159 src_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0)
284 return ret;
285 159 jpg_unescape(src, src_size, c->buf, &unesc_size);
286 159 memset(c->buf + unesc_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
287
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159 if((ret = init_get_bits8(&gb, c->buf, unesc_size)) < 0)
288 return ret;
289
290 159 width = FFALIGN(width, 16);
291 159 mb_w = width >> 4;
292 159 mb_h = (height + 15) >> 4;
293
294
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159 if (!num_mbs)
295 num_mbs = mb_w * mb_h * 4;
296
297
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636 for (i = 0; i < 3; i++)
298 477 c->prev_dc[i] = 1024;
299 159 bx =
300 159 by = 0;
301 159 c->bdsp.clear_blocks(c->block[0]);
302
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1069 for (mb_y = 0; mb_y < mb_h; mb_y++) {
303
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11926 for (mb_x = 0; mb_x < mb_w; mb_x++) {
304
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11016 if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
305
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4574 !mask[mb_x * 2 + mask_stride] &&
306
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4458 !mask[mb_x * 2 + 1 + mask_stride]) {
307 4437 bx += 16;
308 4437 continue;
309 }
310
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19737 for (j = 0; j < 2; j++) {
311
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39474 for (i = 0; i < 2; i++) {
312
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26316 if (mask && !mask[mb_x * 2 + i + j * mask_stride])
313 1190 continue;
314 25126 num_mbs--;
315
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25126 if ((ret = jpg_decode_block(c, &gb, 0,
316 25126 c->block[i + j * 2])) != 0)
317 return ret;
318 25126 c->idsp.idct(c->block[i + j * 2]);
319 }
320 }
321
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19737 for (i = 1; i < 3; i++) {
322
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13158 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
323 return ret;
324 13158 c->idsp.idct(c->block[i + 3]);
325 }
326
327
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111843 for (j = 0; j < 16; j++) {
328 105264 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
329
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1789488 for (i = 0; i < 16; i++) {
330 int Y, U, V;
331
332 1684224 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
333 1684224 U = c->block[4][(i >> 1) + (j >> 1) * 8] - 128;
334 1684224 V = c->block[5][(i >> 1) + (j >> 1) * 8] - 128;
335 1684224 yuv2rgb(out + i * 3, ridx, Y, U, V);
336 }
337 }
338
339
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6579 if (!num_mbs)
340 159 return 0;
341 6420 bx += 16;
342 }
343 910 bx = 0;
344 910 by += 16;
345
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910 if (mask)
346 910 mask += mask_stride * 2;
347 }
348
349 return 0;
350 }
351
352 #define LOAD_NEIGHBOURS(x) \
353 W = curr_row[(x) - 1]; \
354 N = above_row[(x)]; \
355 WW = curr_row[(x) - 2]; \
356 NW = above_row[(x) - 1]; \
357 NE = above_row[(x) + 1]; \
358 NN = above2_row[(x)]; \
359 NNW = above2_row[(x) - 1]; \
360 NWW = above_row[(x) - 2]; \
361 NNE = above2_row[(x) + 1]
362
363 #define UPDATE_NEIGHBOURS(x) \
364 NNW = NN; \
365 NN = NNE; \
366 NWW = NW; \
367 NW = N; \
368 N = NE; \
369 NE = above_row[(x) + 1]; \
370 NNE = above2_row[(x) + 1]
371
372 #define R_shift 16
373 #define G_shift 8
374 #define B_shift 0
375
376 /* improved djb2 hash from http://www.cse.yorku.ca/~oz/hash.html */
377 97781 static int djb2_hash(uint32_t key)
378 {
379 97781 uint32_t h = 5381;
380
381 97781 h = (h * 33) ^ ((key >> 24) & 0xFF); // xxx: probably not needed at all
382 97781 h = (h * 33) ^ ((key >> 16) & 0xFF);
383 97781 h = (h * 33) ^ ((key >> 8) & 0xFF);
384 97781 h = (h * 33) ^ (key & 0xFF);
385
386 97781 return h & (EPIC_HASH_SIZE - 1);
387 }
388
389 136 static void epic_hash_init(ePICPixHash *hash)
390 {
391 136 memset(hash, 0, sizeof(*hash));
392 136 }
393
394 97247 static ePICPixHashElem *epic_hash_find(const ePICPixHash *hash, uint32_t key)
395 {
396 97247 int i, idx = djb2_hash(key);
397 97247 ePICPixHashElem *bucket = hash->bucket[idx];
398
399
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97299 for (i = 0; i < hash->bucket_fill[idx]; i++)
400
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94232 if (bucket[i].pix_id == key)
401 94180 return &bucket[i];
402
403 3067 return NULL;
404 }
405
406 534 static ePICPixHashElem *epic_hash_add(ePICPixHash *hash, uint32_t key)
407 {
408 ePICPixHashElem *bucket, *ret;
409 534 int idx = djb2_hash(key);
410
411
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534 if (hash->bucket_size[idx] > INT_MAX / sizeof(**hash->bucket))
412 return NULL;
413
414
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534 if (!(hash->bucket_fill[idx] < hash->bucket_size[idx])) {
415 531 int new_size = hash->bucket_size[idx] + 16;
416 531 bucket = av_realloc(hash->bucket[idx], new_size * sizeof(*bucket));
417
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531 if (!bucket)
418 return NULL;
419 531 hash->bucket[idx] = bucket;
420 531 hash->bucket_size[idx] = new_size;
421 }
422
423 534 ret = &hash->bucket[idx][hash->bucket_fill[idx]++];
424 534 memset(ret, 0, sizeof(*ret));
425 534 ret->pix_id = key;
426 534 return ret;
427 }
428
429 1658 static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
430 {
431 ePICPixListElem *new_elem;
432 1658 ePICPixHashElem *hash_elem = epic_hash_find(hash, key);
433
434
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1658 if (!hash_elem) {
435
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534 if (!(hash_elem = epic_hash_add(hash, key)))
436 return AVERROR(ENOMEM);
437 }
438
439 1658 new_elem = av_mallocz(sizeof(*new_elem));
440
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1658 if (!new_elem)
441 return AVERROR(ENOMEM);
442
443 1658 new_elem->pixel = pix;
444 1658 new_elem->next = hash_elem->list;
445 1658 hash_elem->list = new_elem;
446
447 1658 return 0;
448 }
449
450 41955 static inline int epic_cache_entries_for_pixel(const ePICPixHash *hash,
451 uint32_t pix)
452 {
453 41955 ePICPixHashElem *hash_elem = epic_hash_find(hash, pix);
454
455
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41955 if (hash_elem != NULL && hash_elem->list != NULL)
456 39956 return 1;
457
458 1999 return 0;
459 }
460
461 136 static void epic_free_pixel_cache(ePICPixHash *hash)
462 {
463 int i, j;
464
465
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34952 for (i = 0; i < EPIC_HASH_SIZE; i++) {
466
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35350 for (j = 0; j < hash->bucket_fill[i]; j++) {
467 534 ePICPixListElem *list_elem = hash->bucket[i][j].list;
468
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2192 while (list_elem) {
469 1658 ePICPixListElem *tmp = list_elem->next;
470 1658 av_free(list_elem);
471 1658 list_elem = tmp;
472 }
473 }
474 34816 av_freep(&hash->bucket[i]);
475 34816 hash->bucket_size[i] =
476 34816 hash->bucket_fill[i] = 0;
477 }
478 136 }
479
480 510904 static inline int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
481 {
482 int i;
483
484
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1163688 for (i = 0; i < dc->stack_pos; i++)
485
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806184 if (dc->stack[i] == pix)
486 153400 break;
487
488 510904 return i != dc->stack_pos;
489 }
490
491 #define TOSIGNED(val) (((val) >> 1) ^ -((val) & 1))
492
493 9558 static inline int epic_decode_component_pred(ePICContext *dc,
494 int N, int W, int NW)
495 {
496 9558 unsigned delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
497 9558 return mid_pred(N, N + W - NW, W) - TOSIGNED(delta);
498 }
499
500 4739 static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y,
501 const uint32_t *curr_row,
502 const uint32_t *above_row)
503 {
504 uint32_t N, W, NW, pred;
505 unsigned delta;
506 int GN, GW, GNW, R, G, B;
507
508
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4739 if (x && y) {
509 3186 W = curr_row[x - 1];
510 3186 N = above_row[x];
511 3186 NW = above_row[x - 1];
512
513 3186 GN = (N >> G_shift) & 0xFF;
514 3186 GW = (W >> G_shift) & 0xFF;
515 3186 GNW = (NW >> G_shift) & 0xFF;
516
517 3186 G = epic_decode_component_pred(dc, GN, GW, GNW);
518
519 6372 R = G + epic_decode_component_pred(dc,
520 3186 ((N >> R_shift) & 0xFF) - GN,
521 3186 ((W >> R_shift) & 0xFF) - GW,
522 3186 ((NW >> R_shift) & 0xFF) - GNW);
523
524 3186 B = G + epic_decode_component_pred(dc,
525 3186 ((N >> B_shift) & 0xFF) - GN,
526 3186 ((W >> B_shift) & 0xFF) - GW,
527 3186 ((NW >> B_shift) & 0xFF) - GNW);
528 } else {
529
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1553 if (x)
530 471 pred = curr_row[x - 1];
531 else
532 1082 pred = above_row[x];
533
534 1553 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
535 1553 R = ((pred >> R_shift) & 0xFF) - TOSIGNED(delta);
536
537 1553 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
538 1553 G = ((pred >> G_shift) & 0xFF) - TOSIGNED(delta);
539
540 1553 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
541 1553 B = ((pred >> B_shift) & 0xFF) - TOSIGNED(delta);
542 }
543
544
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4739 if (R<0 || G<0 || B<0 || R > 255 || G > 255 || B > 255) {
545 avpriv_request_sample(NULL, "RGB %d %d %d (out of range)", R, G, B);
546 return 0;
547 }
548
549 4739 return (R << R_shift) | (G << G_shift) | (B << B_shift);
550 }
551
552 99449 static int epic_predict_pixel(ePICContext *dc, uint8_t *rung,
553 uint32_t *pPix, uint32_t pix)
554 {
555
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99449 if (!ff_els_decode_bit(&dc->els_ctx, rung)) {
556 91084 *pPix = pix;
557 91084 return 1;
558 }
559 8365 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
560 8365 return 0;
561 }
562
563 95756 static int epic_handle_edges(ePICContext *dc, int x, int y,
564 const uint32_t *curr_row,
565 const uint32_t *above_row, uint32_t *pPix)
566 {
567 uint32_t pix;
568
569
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95756 if (!x && !y) { /* special case: top-left pixel */
570 /* the top-left pixel is coded independently with 3 unsigned numbers */
571 136 *pPix = (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << R_shift) |
572 136 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << G_shift) |
573 136 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << B_shift);
574 136 return 1;
575 }
576
577
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95620 if (x) { /* predict from W first */
578 78572 pix = curr_row[x - 1];
579
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✓ Branch 2 taken 6523 times.
78572 if (epic_predict_pixel(dc, &dc->W_flag_rung, pPix, pix))
580 72049 return 1;
581 }
582
583
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23571 if (y) { /* then try to predict from N */
584 22080 pix = above_row[x];
585
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22080 if (!dc->stack_pos || dc->stack[0] != pix) {
586
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✓ Branch 2 taken 1842 times.
20877 if (epic_predict_pixel(dc, &dc->N_flag_rung, pPix, pix))
587 19035 return 1;
588 }
589 }
590
591 4536 return 0;
592 }
593
594 218240 static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width,
595 const uint32_t *curr_row,
596 const uint32_t *above_row,
597 const uint32_t *above2_row,
598 uint32_t *pPix, int *pRun)
599 {
600 218240 int idx, got_pixel = 0, WWneW, old_WWneW = 0;
601 uint32_t W, WW, N, NN, NW, NE, NWW, NNW, NNE;
602
603 218240 *pRun = 0;
604
605 218240 LOAD_NEIGHBOURS(x);
606
607
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218240 if (dc->next_run_pos == x) {
608 /* can't reuse W for the new pixel in this case */
609 199455 WWneW = 1;
610 } else {
611
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18785 idx = (WW != W) << 7 |
612
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18785 (NW != W) << 6 |
613
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18785 (N != NE) << 5 |
614
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18785 (NW != N) << 4 |
615
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18785 (NWW != NW) << 3 |
616
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✓ Branch 1 taken 16816 times.
18785 (NNE != NE) << 2 |
617
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✓ Branch 1 taken 16902 times.
18785 (NN != N) << 1 |
618 18785 (NNW != NW);
619 18785 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
620
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18785 if (WWneW < 0)
621 return WWneW;
622 }
623
624
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218240 if (WWneW)
625 201691 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = W;
626 else {
627 16549 *pPix = W;
628 16549 got_pixel = 1;
629 }
630
631 do {
632 503572 int NWneW = 1;
633
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503572 if (got_pixel) // pixel value already known (derived from either W or N)
634 237740 NWneW = *pPix != N;
635 else { // pixel value is unknown and will be decoded later
636
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265832 NWneW = *pRun ? NWneW : NW != W;
637
638 /* TODO: RFC this mess! */
639
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265832 switch (((NW != N) << 2) | (NWneW << 1) | WWneW) {
640 case 0:
641 break; // do nothing here
642 176548 case 3:
643 case 5:
644 case 6:
645 case 7:
646
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176548 if (!is_pixel_on_stack(dc, N)) {
647 457674 idx = WWneW << 8 |
648
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152558 (*pRun ? old_WWneW : WW != W) << 7 |
649 305116 NWneW << 6 |
650
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152558 (N != NE) << 5 |
651
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152558 (NW != N) << 4 |
652
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152558 (NWW != NW) << 3 |
653
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152558 (NNE != NE) << 2 |
654
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152558 (NN != N) << 1 |
655 152558 (NNW != NW);
656
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152558 if (!ff_els_decode_bit(&dc->els_ctx, &dc->N_ctx_rung[idx])) {
657 129319 NWneW = 0;
658 129319 *pPix = N;
659 129319 got_pixel = 1;
660 129319 break;
661 }
662 }
663 /* fall through */
664 default:
665 136513 NWneW = 1;
666 136513 old_WWneW = WWneW;
667
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136513 if (!is_pixel_on_stack(dc, N))
668 23239 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = N;
669 }
670 }
671
672 503572 (*pRun)++;
673
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503572 if (x + *pRun >= tile_width - 1)
674 3378 break;
675
676 500194 UPDATE_NEIGHBOURS(x + *pRun);
677
678
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500194 if (!NWneW && NW == N && N == NE) {
679 int pos, run, rle;
680 99184 int start_pos = x + *pRun;
681
682 /* scan for a run of pix in the line above */
683 99184 uint32_t pix = above_row[start_pos + 1];
684
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2511691 for (pos = start_pos + 2; pos < tile_width; pos++)
685
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2496269 if (!(above_row[pos] == pix))
686 83762 break;
687 99184 run = pos - start_pos - 1;
688 99184 idx = av_ceil_log2(run);
689
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✓ Branch 1 taken 66738 times.
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99184 if (ff_els_decode_bit(&dc->els_ctx, &dc->prev_row_rung[idx]))
690 66738 *pRun += run;
691 else {
692 int flag;
693 /* run-length is coded as plain binary number of idx - 1 bits */
694
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131763 for (pos = idx - 1, rle = 0, flag = 0; pos >= 0; pos--) {
695
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193930 if ((1 << pos) + rle < run &&
696
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94613 ff_els_decode_bit(&dc->els_ctx,
697 flag ? &dc->runlen_one
698 : &dc->runlen_zeroes[pos])) {
699 33844 flag = 1;
700 33844 rle |= 1 << pos;
701 }
702 }
703 32446 *pRun += rle;
704 32446 break; // return immediately
705 }
706
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66738 if (x + *pRun >= tile_width - 1)
707 13519 break;
708
709 53219 LOAD_NEIGHBOURS(x + *pRun);
710 53219 WWneW = 0;
711 53219 NWneW = 0;
712 }
713
714 908458 idx = WWneW << 7 |
715 908458 NWneW << 6 |
716
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454229 (N != NE) << 5 |
717
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454229 (NW != N) << 4 |
718
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454229 (NWW != NW) << 3 |
719
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454229 (NNE != NE) << 2 |
720
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454229 (NN != N) << 1 |
721 454229 (NNW != NW);
722 454229 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
723
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454229 } while (!WWneW);
724
725 218240 dc->next_run_pos = x + *pRun;
726 218240 return got_pixel;
727 }
728
729 36049 static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung,
730 uint32_t *pPix, uint32_t pix)
731 {
732
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36049 if (ff_els_decode_bit(&dc->els_ctx, rung)) {
733 22192 *pPix = pix;
734 22192 return 1;
735 }
736 13857 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
737 13857 return 0;
738 }
739
740 76908 static int epic_predict_from_NW_NE(ePICContext *dc, int x, int y, int run,
741 int tile_width, const uint32_t *curr_row,
742 const uint32_t *above_row, uint32_t *pPix)
743 {
744 int pos;
745
746 /* try to reuse the NW pixel first */
747
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76908 if (x && y) {
748 73974 uint32_t NW = above_row[x - 1];
749
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73974 if (NW != curr_row[x - 1] && NW != above_row[x] && !is_pixel_on_stack(dc, NW)) {
750
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20189 if (epic_predict_pixel2(dc, &dc->nw_pred_rung[NW & 0xFF], pPix, NW))
751 12191 return 1;
752 }
753 }
754
755 /* try to reuse the NE[x + run, y] pixel */
756 64717 pos = x + run - 1;
757
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64717 if (pos < tile_width - 1 && y) {
758 62826 uint32_t NE = above_row[pos + 1];
759
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62826 if (NE != above_row[pos] && !is_pixel_on_stack(dc, NE)) {
760
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15860 if (epic_predict_pixel2(dc, &dc->ne_pred_rung[NE & 0xFF], pPix, NE))
761 10001 return 1;
762 }
763 }
764
765 54716 return 0;
766 }
767
768 53634 static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix)
769 {
770 53634 ePICPixListElem *list, *prev = NULL;
771 53634 ePICPixHashElem *hash_elem = epic_hash_find(&dc->hash, W);
772
773
3/4
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53634 if (!hash_elem || !hash_elem->list)
774 534 return 0;
775
776 53100 list = hash_elem->list;
777
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✓ Branch 1 taken 1124 times.
154706 while (list) {
778
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153582 if (!is_pixel_on_stack(dc, list->pixel)) {
779
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142918 if (ff_els_decode_bit(&dc->els_ctx, &list->rung)) {
780 51976 *pPix = list->pixel;
781
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51976 if (list != hash_elem->list) {
782 36609 prev->next = list->next;
783 36609 list->next = hash_elem->list;
784 36609 hash_elem->list = list;
785 }
786 51976 return 1;
787 }
788 90942 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = list->pixel;
789 }
790 101606 prev = list;
791 101606 list = list->next;
792 }
793
794 1124 return 0;
795 }
796
797 136 static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height,
798 int tile_width, int stride)
799 {
800 int x, y;
801 uint32_t pix;
802 136 uint32_t *curr_row = NULL, *above_row = NULL, *above2_row;
803
804
2/2
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17320 for (y = 0; y < tile_height; y++, out += stride) {
805 17184 above2_row = above_row;
806 17184 above_row = curr_row;
807 17184 curr_row = (uint32_t *) out;
808
809
2/2
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333179 for (x = 0, dc->next_run_pos = 0; x < tile_width;) {
810
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315995 if (dc->els_ctx.err)
811 return AVERROR_INVALIDDATA; // bail out in the case of ELS overflow
812
813 315995 pix = curr_row[x - 1]; // get W pixel
814
815
4/4
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315995 if (y >= 1 && x >= 2 &&
816
4/4
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259371 pix != curr_row[x - 2] && pix != above_row[x - 1] &&
817
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101123 pix != above_row[x - 2] && pix != above_row[x] &&
818 41955 !epic_cache_entries_for_pixel(&dc->hash, pix)) {
819 1999 curr_row[x] = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
820 1999 x++;
821 } else {
822 int got_pixel, run;
823 313996 dc->stack_pos = 0; // empty stack
824
825
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313996 if (y < 2 || x < 2 || x == tile_width - 1) {
826 95756 run = 1;
827 95756 got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix);
828 } else {
829 218240 got_pixel = epic_decode_run_length(dc, x, y, tile_width,
830 curr_row, above_row,
831 above2_row, &pix, &run);
832
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218240 if (got_pixel < 0)
833 return got_pixel;
834 }
835
836
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313996 if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run,
837 tile_width, curr_row,
838 above_row, &pix)) {
839 54716 uint32_t ref_pix = curr_row[x - 1];
840
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54716 if (!x || !epic_decode_from_cache(dc, ref_pix, &pix)) {
841 2740 pix = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
842
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2740 if (is_pixel_on_stack(dc, pix))
843 return AVERROR_INVALIDDATA;
844
845
2/2
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2740 if (x) {
846 1658 int ret = epic_add_pixel_to_cache(&dc->hash,
847 ref_pix,
848 pix);
849
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1658 if (ret)
850 return ret;
851 }
852 }
853 }
854
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3159741 for (; run > 0; x++, run--)
855 2845745 curr_row[x] = pix;
856 }
857 }
858 }
859
860 136 return 0;
861 }
862
863 136 static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y,
864 const uint8_t *src, size_t src_size,
865 AVCodecContext *avctx)
866 {
867 136 uint8_t prefix, mask = 0x80;
868 int extrabytes, tile_width, tile_height, awidth, aheight;
869 size_t els_dsize;
870 uint8_t *dst;
871
872
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136 if (!src_size)
873 return 0;
874
875 /* get data size of the ELS partition as unsigned variable-length integer */
876 136 prefix = *src++;
877 136 src_size--;
878
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224 for (extrabytes = 0; (prefix & mask) && (extrabytes < 7); extrabytes++)
879 88 mask >>= 1;
880
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136 if (extrabytes > 3 || src_size < extrabytes) {
881 av_log(avctx, AV_LOG_ERROR, "ePIC: invalid data size VLI\n");
882 return AVERROR_INVALIDDATA;
883 }
884
885 136 els_dsize = prefix & ((0x80 >> extrabytes) - 1); // mask out the length prefix
886
2/2
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224 while (extrabytes-- > 0) {
887 88 els_dsize = (els_dsize << 8) | *src++;
888 88 src_size--;
889 }
890
891
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136 if (src_size < els_dsize) {
892 av_log(avctx, AV_LOG_ERROR, "ePIC: data too short, needed %"SIZE_SPECIFIER", got %"SIZE_SPECIFIER"\n",
893 els_dsize, src_size);
894 return AVERROR_INVALIDDATA;
895 }
896
897 136 tile_width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
898 136 tile_height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
899 136 awidth = FFALIGN(tile_width, 16);
900 136 aheight = FFALIGN(tile_height, 16);
901
902
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136 if (tile_width > (1 << FF_ARRAY_ELEMS(c->ec.prev_row_rung))) {
903 avpriv_request_sample(avctx, "large tile width");
904 return AVERROR_INVALIDDATA;
905 }
906
907
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136 if (els_dsize) {
908 int ret, i, j, k;
909 uint8_t tr_r, tr_g, tr_b, *buf;
910 uint32_t *in;
911 /* ELS decoder initializations */
912 136 memset(&c->ec, 0, sizeof(c->ec));
913 136 ff_els_decoder_init(&c->ec.els_ctx, src, els_dsize);
914 136 epic_hash_init(&c->ec.hash);
915
916 /* decode transparent pixel value */
917 136 tr_r = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
918 136 tr_g = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
919 136 tr_b = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
920
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136 if (c->ec.els_ctx.err != 0) {
921 av_log(avctx, AV_LOG_ERROR,
922 "ePIC: couldn't decode transparency pixel!\n");
923 ff_els_decoder_uninit(&c->ec.unsigned_rung);
924 return AVERROR_INVALIDDATA;
925 }
926
927 136 ret = epic_decode_tile(&c->ec, c->epic_buf, tile_height, tile_width,
928 c->epic_buf_stride);
929
930 136 epic_free_pixel_cache(&c->ec.hash);
931 136 ff_els_decoder_uninit(&c->ec.unsigned_rung);
932
933
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136 if (ret) {
934 av_log(avctx, AV_LOG_ERROR,
935 "ePIC: tile decoding failed, frame=%d, tile_x=%d, tile_y=%d\n",
936 avctx->frame_number, tile_x, tile_y);
937 return AVERROR_INVALIDDATA;
938 }
939
940 136 buf = c->epic_buf;
941 136 dst = c->framebuf + tile_x * c->tile_width * 3 +
942 136 tile_y * c->tile_height * c->framebuf_stride;
943
944
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17320 for (j = 0; j < tile_height; j++) {
945 17184 uint8_t *out = dst;
946 17184 in = (uint32_t *) buf;
947
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2864928 for (i = 0; i < tile_width; i++) {
948 2847744 out[0] = (in[i] >> R_shift) & 0xFF;
949 2847744 out[1] = (in[i] >> G_shift) & 0xFF;
950 2847744 out[2] = (in[i] >> B_shift) & 0xFF;
951 2847744 out += 3;
952 }
953 17184 buf += c->epic_buf_stride;
954 17184 dst += c->framebuf_stride;
955 }
956
957
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136 if (src_size > els_dsize) {
958 uint8_t *jpg;
959 uint32_t tr;
960 92 int bstride = FFALIGN(tile_width, 16) >> 3;
961 92 int nblocks = 0;
962 92 int estride = c->epic_buf_stride >> 2;
963
964 92 src += els_dsize;
965 92 src_size -= els_dsize;
966
967 92 in = (uint32_t *) c->epic_buf;
968 92 tr = (tr_r << R_shift) | (tr_g << G_shift) | (tr_b << B_shift);
969
970 92 memset(c->kempf_flags, 0,
971 92 (aheight >> 3) * bstride * sizeof(*c->kempf_flags));
972
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1543 for (j = 0; j < tile_height; j += 8) {
973
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32605 for (i = 0; i < tile_width; i += 8) {
974 31154 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 0;
975
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1113006 for (k = 0; k < 8 * 8; k++) {
976
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1096594 if (in[i + (k & 7) + (k >> 3) * estride] == tr) {
977 14742 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 1;
978 14742 nblocks++;
979 14742 break;
980 }
981 }
982 }
983 1451 in += 8 * estride;
984 }
985
986 92 memset(c->jpeg_tile, 0, c->tile_stride * aheight);
987 92 jpg_decode_data(&c->jc, awidth, aheight, src, src_size,
988 c->jpeg_tile, c->tile_stride,
989 92 c->kempf_flags, bstride, nblocks, c->swapuv);
990
991 92 in = (uint32_t *) c->epic_buf;
992 92 dst = c->framebuf + tile_x * c->tile_width * 3 +
993 92 tile_y * c->tile_height * c->framebuf_stride;
994 92 jpg = c->jpeg_tile;
995
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11672 for (j = 0; j < tile_height; j++) {
996
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2000508 for (i = 0; i < tile_width; i++)
997
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1988928 if (in[i] == tr)
998 717442 memcpy(dst + i * 3, jpg + i * 3, 3);
999 11580 in += c->epic_buf_stride >> 2;
1000 11580 dst += c->framebuf_stride;
1001 11580 jpg += c->tile_stride;
1002 }
1003 }
1004 } else {
1005 dst = c->framebuf + tile_x * c->tile_width * 3 +
1006 tile_y * c->tile_height * c->framebuf_stride;
1007 return jpg_decode_data(&c->jc, tile_width, tile_height, src, src_size,
1008 dst, c->framebuf_stride, NULL, 0, 0, c->swapuv);
1009 }
1010
1011 136 return 0;
1012 }
1013
1014 81 static int kempf_restore_buf(const uint8_t *src, int len,
1015 uint8_t *dst, int stride,
1016 const uint8_t *jpeg_tile, int tile_stride,
1017 int width, int height,
1018 const uint8_t *pal, int npal, int tidx)
1019 {
1020 GetBitContext gb;
1021 int i, j, nb, col;
1022 int ret;
1023 81 int align_width = FFALIGN(width, 16);
1024
1025
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81 if ((ret = init_get_bits8(&gb, src, len)) < 0)
1026 return ret;
1027
1028
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81 if (npal <= 2) nb = 1;
1029
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81 else if (npal <= 4) nb = 2;
1030
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66 else if (npal <= 16) nb = 4;
1031 29 else nb = 8;
1032
1033
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10449 for (j = 0; j < height; j++, dst += stride, jpeg_tile = FF_PTR_ADD(jpeg_tile, tile_stride)) {
1034
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10368 if (get_bits(&gb, 8))
1035 continue;
1036
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1654912 for (i = 0; i < width; i++) {
1037 1644544 col = get_bits(&gb, nb);
1038
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1644544 if (col != tidx)
1039 1323579 memcpy(dst + i * 3, pal + col * 3, 3);
1040 else
1041 320965 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
1042 }
1043 10368 skip_bits_long(&gb, nb * (align_width - width));
1044 }
1045
1046 81 return 0;
1047 }
1048
1049 101 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
1050 const uint8_t *src, int src_size)
1051 {
1052 int width, height;
1053 101 int hdr, zsize, npal, tidx = -1, ret;
1054 int i, j;
1055 101 const uint8_t *src_end = src + src_size;
1056 uint8_t pal[768], transp[3];
1057 101 uLongf dlen = (c->tile_width + 1) * c->tile_height;
1058 int sub_type;
1059 int nblocks, cblocks, bstride;
1060 int bits, bitbuf, coded;
1061 101 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
1062 101 tile_y * c->tile_height * c->framebuf_stride;
1063
1064
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101 if (src_size < 2)
1065 return AVERROR_INVALIDDATA;
1066
1067 101 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
1068 101 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
1069
1070 101 hdr = *src++;
1071 101 sub_type = hdr >> 5;
1072
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101 if (sub_type == 0) {
1073 int j;
1074 20 memcpy(transp, src, 3);
1075 20 src += 3;
1076
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2580 for (j = 0; j < height; j++, dst += c->framebuf_stride)
1077
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403968 for (i = 0; i < width; i++)
1078 401408 memcpy(dst + i * 3, transp, 3);
1079 20 return 0;
1080
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81 } else if (sub_type == 1) {
1081 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
1082 dst, c->framebuf_stride, NULL, 0, 0, 0);
1083 }
1084
1085
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81 if (sub_type != 2) {
1086 67 memcpy(transp, src, 3);
1087 67 src += 3;
1088 }
1089 81 npal = *src++ + 1;
1090
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81 if (src_end - src < npal * 3)
1091 return AVERROR_INVALIDDATA;
1092 81 memcpy(pal, src, npal * 3);
1093 81 src += npal * 3;
1094
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81 if (sub_type != 2) {
1095
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134 for (i = 0; i < npal; i++) {
1096
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134 if (!memcmp(pal + i * 3, transp, 3)) {
1097 67 tidx = i;
1098 67 break;
1099 }
1100 }
1101 }
1102
1103
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81 if (src_end - src < 2)
1104 return 0;
1105 81 zsize = (src[0] << 8) | src[1];
1106 81 src += 2;
1107
1108
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81 if (src_end - src < zsize + (sub_type != 2))
1109 return AVERROR_INVALIDDATA;
1110
1111 81 ret = uncompress(c->kempf_buf, &dlen, src, zsize);
1112
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81 if (ret)
1113 return AVERROR_INVALIDDATA;
1114 81 src += zsize;
1115
1116
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81 if (sub_type == 2) {
1117 14 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1118 NULL, 0, width, height, pal, npal, tidx);
1119 14 return 0;
1120 }
1121
1122 67 nblocks = *src++ + 1;
1123 67 cblocks = 0;
1124 67 bstride = FFALIGN(width, 16) >> 3;
1125 // blocks are coded LSB and we need normal bitreader for JPEG data
1126 67 bits = 0;
1127
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603 for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
1128
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5984 for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
1129
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5448 if (!bits) {
1130
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681 if (src >= src_end)
1131 return AVERROR_INVALIDDATA;
1132 681 bitbuf = *src++;
1133 681 bits = 8;
1134 }
1135 5448 coded = bitbuf & 1;
1136 5448 bits--;
1137 5448 bitbuf >>= 1;
1138 5448 cblocks += coded;
1139
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5448 if (cblocks > nblocks)
1140 return AVERROR_INVALIDDATA;
1141 5448 c->kempf_flags[j * 2 + i * 2 * bstride] =
1142 5448 c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
1143 5448 c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
1144 5448 c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
1145 }
1146 }
1147
1148 67 memset(c->jpeg_tile, 0, c->tile_stride * height);
1149 67 jpg_decode_data(&c->jc, width, height, src, src_end - src,
1150 c->jpeg_tile, c->tile_stride,
1151 67 c->kempf_flags, bstride, nblocks * 4, 0);
1152
1153 67 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1154 67 c->jpeg_tile, c->tile_stride,
1155 width, height, pal, npal, tidx);
1156
1157 67 return 0;
1158 }
1159
1160 4 static int g2m_init_buffers(G2MContext *c)
1161 {
1162 int aligned_height;
1163
1164
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4 if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
1165 4 c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
1166 4 aligned_height = c->height + 15;
1167 4 av_free(c->framebuf);
1168 4 c->framebuf = av_calloc(c->framebuf_stride, aligned_height);
1169
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4 if (!c->framebuf)
1170 return AVERROR(ENOMEM);
1171 }
1172
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4 if (!c->synth_tile || !c->jpeg_tile ||
1173
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1 (c->compression == 2 && !c->epic_buf_base) ||
1174
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1 c->old_tile_w < c->tile_width ||
1175 c->old_tile_h < c->tile_height) {
1176 4 c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
1177 4 c->epic_buf_stride = FFALIGN(c->tile_width * 4, 16);
1178 4 aligned_height = FFALIGN(c->tile_height, 16);
1179 4 av_freep(&c->synth_tile);
1180 4 av_freep(&c->jpeg_tile);
1181 4 av_freep(&c->kempf_buf);
1182 4 av_freep(&c->kempf_flags);
1183 4 av_freep(&c->epic_buf_base);
1184 4 c->epic_buf = NULL;
1185 4 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
1186 4 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
1187 4 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height +
1188 AV_INPUT_BUFFER_PADDING_SIZE);
1189 4 c->kempf_flags = av_mallocz(c->tile_width * aligned_height);
1190
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4 if (!c->synth_tile || !c->jpeg_tile ||
1191
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4 !c->kempf_buf || !c->kempf_flags)
1192 return AVERROR(ENOMEM);
1193
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4 if (c->compression == 2) {
1194 3 c->epic_buf_base = av_mallocz(c->epic_buf_stride * aligned_height + 4);
1195
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3 if (!c->epic_buf_base)
1196 return AVERROR(ENOMEM);
1197 3 c->epic_buf = c->epic_buf_base + 4;
1198 }
1199 }
1200
1201 4 return 0;
1202 }
1203
1204 14 static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
1205 GetByteContext *gb)
1206 {
1207 int i, j, k;
1208 uint8_t *dst;
1209 uint32_t bits;
1210 uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
1211 uint32_t cursor_hot_x, cursor_hot_y;
1212 int cursor_fmt, err;
1213
1214 14 cur_size = bytestream2_get_be32(gb);
1215 14 cursor_w = bytestream2_get_byte(gb);
1216 14 cursor_h = bytestream2_get_byte(gb);
1217 14 cursor_hot_x = bytestream2_get_byte(gb);
1218 14 cursor_hot_y = bytestream2_get_byte(gb);
1219 14 cursor_fmt = bytestream2_get_byte(gb);
1220
1221
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14 cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
1222
1223
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14 if (cursor_w < 1 || cursor_w > 256 ||
1224
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14 cursor_h < 1 || cursor_h > 256) {
1225 av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
1226 cursor_w, cursor_h);
1227 return AVERROR_INVALIDDATA;
1228 }
1229
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14 if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
1230 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
1231 cursor_hot_x, cursor_hot_y);
1232 cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
1233 cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
1234 }
1235
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14 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
1236
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14 c->cursor_w * c->cursor_h / 4 > cur_size) {
1237 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
1238 cur_size, bytestream2_get_bytes_left(gb));
1239 return AVERROR_INVALIDDATA;
1240 }
1241
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14 if (cursor_fmt != 1 && cursor_fmt != 32) {
1242 avpriv_report_missing_feature(avctx, "Cursor format %d",
1243 cursor_fmt);
1244 return AVERROR_PATCHWELCOME;
1245 }
1246
1247
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14 if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
1248 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
1249 return err;
1250 }
1251
1252 14 c->cursor_w = cursor_w;
1253 14 c->cursor_h = cursor_h;
1254 14 c->cursor_hot_x = cursor_hot_x;
1255 14 c->cursor_hot_y = cursor_hot_y;
1256 14 c->cursor_fmt = cursor_fmt;
1257 14 c->cursor_stride = cursor_stride;
1258
1259 14 dst = c->cursor;
1260
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14 switch (c->cursor_fmt) {
1261 13 case 1: // old monochrome
1262
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429 for (j = 0; j < c->cursor_h; j++) {
1263
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832 for (i = 0; i < c->cursor_w; i += 32) {
1264 416 bits = bytestream2_get_be32(gb);
1265
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13728 for (k = 0; k < 32; k++) {
1266 13312 dst[0] = !!(bits & 0x80000000);
1267 13312 dst += 4;
1268 13312 bits <<= 1;
1269 }
1270 }
1271 }
1272
1273 13 dst = c->cursor;
1274
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429 for (j = 0; j < c->cursor_h; j++) {
1275
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832 for (i = 0; i < c->cursor_w; i += 32) {
1276 416 bits = bytestream2_get_be32(gb);
1277
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13728 for (k = 0; k < 32; k++) {
1278 13312 int mask_bit = !!(bits & 0x80000000);
1279
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13312 switch (dst[0] * 2 + mask_bit) {
1280 824 case 0:
1281 824 dst[0] = 0xFF;
1282 824 dst[1] = 0x00;
1283 824 dst[2] = 0x00;
1284 824 dst[3] = 0x00;
1285 824 break;
1286 920 case 1:
1287 920 dst[0] = 0xFF;
1288 920 dst[1] = 0xFF;
1289 920 dst[2] = 0xFF;
1290 920 dst[3] = 0xFF;
1291 920 break;
1292 11568 default:
1293 11568 dst[0] = 0x00;
1294 11568 dst[1] = 0x00;
1295 11568 dst[2] = 0x00;
1296 11568 dst[3] = 0x00;
1297 }
1298 13312 dst += 4;
1299 13312 bits <<= 1;
1300 }
1301 }
1302 }
1303 13 break;
1304 1 case 32: // full colour
1305 /* skip monochrome version of the cursor and decode RGBA instead */
1306 1 bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
1307
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33 for (j = 0; j < c->cursor_h; j++) {
1308
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1056 for (i = 0; i < c->cursor_w; i++) {
1309 1024 int val = bytestream2_get_be32(gb);
1310 1024 *dst++ = val >> 0;
1311 1024 *dst++ = val >> 8;
1312 1024 *dst++ = val >> 16;
1313 1024 *dst++ = val >> 24;
1314 }
1315 }
1316 1 break;
1317 default:
1318 return AVERROR_PATCHWELCOME;
1319 }
1320 14 return 0;
1321 }
1322
1323 #define APPLY_ALPHA(src, new, alpha) \
1324 src = (src * (256 - alpha) + new * alpha) >> 8
1325
1326 247 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
1327 {
1328 int i, j;
1329 int x, y, w, h;
1330 const uint8_t *cursor;
1331
1332
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247 if (!c->cursor)
1333 return;
1334
1335 247 x = c->cursor_x - c->cursor_hot_x;
1336 247 y = c->cursor_y - c->cursor_hot_y;
1337
1338 247 cursor = c->cursor;
1339 247 w = c->cursor_w;
1340 247 h = c->cursor_h;
1341
1342
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247 if (x + w > c->width)
1343 52 w = c->width - x;
1344
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247 if (y + h > c->height)
1345 h = c->height - y;
1346
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247 if (x < 0) {
1347 w += x;
1348 cursor += -x * 4;
1349 } else {
1350 247 dst += x * 3;
1351 }
1352
1353
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247 if (y < 0)
1354 3 h += y;
1355
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247 if (w < 0 || h < 0)
1356 return;
1357
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247 if (y < 0) {
1358 3 cursor += -y * c->cursor_stride;
1359 } else {
1360 244 dst += y * stride;
1361 }
1362
1363
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8133 for (j = 0; j < h; j++) {
1364
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236974 for (i = 0; i < w; i++) {
1365 229088 uint8_t alpha = cursor[i * 4];
1366 229088 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
1367 229088 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
1368 229088 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
1369 }
1370 7886 dst += stride;
1371 7886 cursor += c->cursor_stride;
1372 }
1373 }
1374
1375 247 static int g2m_decode_frame(AVCodecContext *avctx, AVFrame *pic,
1376 int *got_picture_ptr, AVPacket *avpkt)
1377 {
1378 247 const uint8_t *buf = avpkt->data;
1379 247 int buf_size = avpkt->size;
1380 247 G2MContext *c = avctx->priv_data;
1381 GetByteContext bc, tbc;
1382 int magic;
1383 247 int got_header = 0;
1384 uint32_t chunk_size, r_mask, g_mask, b_mask;
1385 int chunk_type, chunk_start;
1386 int i;
1387 int ret;
1388
1389
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247 if (buf_size < 12) {
1390 av_log(avctx, AV_LOG_ERROR,
1391 "Frame should have at least 12 bytes, got %d instead\n",
1392 buf_size);
1393 return AVERROR_INVALIDDATA;
1394 }
1395
1396 247 bytestream2_init(&bc, buf, buf_size);
1397
1398 247 magic = bytestream2_get_be32(&bc);
1399
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247 if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
1400
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247 (magic & 0xF) < 2 || (magic & 0xF) > 5) {
1401 av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
1402 return AVERROR_INVALIDDATA;
1403 }
1404
1405 247 c->swapuv = magic == MKBETAG('G', '2', 'M', '2');
1406
1407
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761 while (bytestream2_get_bytes_left(&bc) > 5) {
1408 514 chunk_size = bytestream2_get_le32(&bc) - 1;
1409 514 chunk_type = bytestream2_get_byte(&bc);
1410 514 chunk_start = bytestream2_tell(&bc);
1411
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514 if (chunk_size > bytestream2_get_bytes_left(&bc)) {
1412 av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
1413 chunk_size, chunk_type);
1414 break;
1415 }
1416
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514 switch (chunk_type) {
1417 4 case DISPLAY_INFO:
1418 4 got_header =
1419 4 c->got_header = 0;
1420
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4 if (chunk_size < 21) {
1421 av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
1422 chunk_size);
1423 break;
1424 }
1425 4 c->width = bytestream2_get_be32(&bc);
1426 4 c->height = bytestream2_get_be32(&bc);
1427
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4 if (c->width < 16 || c->height < 16) {
1428 av_log(avctx, AV_LOG_ERROR,
1429 "Invalid frame dimensions %dx%d\n",
1430 c->width, c->height);
1431 ret = AVERROR_INVALIDDATA;
1432 goto header_fail;
1433 }
1434
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4 if (c->width != avctx->width || c->height != avctx->height) {
1435 ret = ff_set_dimensions(avctx, c->width, c->height);
1436 if (ret < 0)
1437 goto header_fail;
1438 }
1439 4 c->compression = bytestream2_get_be32(&bc);
1440
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4 if (c->compression != 2 && c->compression != 3) {
1441 avpriv_report_missing_feature(avctx, "Compression method %d",
1442 c->compression);
1443 ret = AVERROR_PATCHWELCOME;
1444 goto header_fail;
1445 }
1446 4 c->tile_width = bytestream2_get_be32(&bc);
1447 4 c->tile_height = bytestream2_get_be32(&bc);
1448
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4 if (c->tile_width <= 0 || c->tile_height <= 0 ||
1449
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4 ((c->tile_width | c->tile_height) & 0xF) ||
1450
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8 c->tile_width * (uint64_t)c->tile_height >= INT_MAX / 4 ||
1451 4 av_image_check_size2(c->tile_width, c->tile_height, avctx->max_pixels, avctx->pix_fmt, 0, avctx) < 0
1452 ) {
1453 av_log(avctx, AV_LOG_ERROR,
1454 "Invalid tile dimensions %dx%d\n",
1455 c->tile_width, c->tile_height);
1456 ret = AVERROR_INVALIDDATA;
1457 goto header_fail;
1458 }
1459 4 c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
1460 4 c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
1461 4 c->bpp = bytestream2_get_byte(&bc);
1462
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4 if (c->bpp == 32) {
1463
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4 if (bytestream2_get_bytes_left(&bc) < 16 ||
1464
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4 (chunk_size - 21) < 16) {
1465 av_log(avctx, AV_LOG_ERROR,
1466 "Display info: missing bitmasks!\n");
1467 ret = AVERROR_INVALIDDATA;
1468 goto header_fail;
1469 }
1470 4 r_mask = bytestream2_get_be32(&bc);
1471 4 g_mask = bytestream2_get_be32(&bc);
1472 4 b_mask = bytestream2_get_be32(&bc);
1473
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4 if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
1474 avpriv_report_missing_feature(avctx,
1475 "Bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32,
1476 r_mask, g_mask, b_mask);
1477 ret = AVERROR_PATCHWELCOME;
1478 goto header_fail;
1479 }
1480 } else {
1481 avpriv_request_sample(avctx, "bpp=%d", c->bpp);
1482 ret = AVERROR_PATCHWELCOME;
1483 goto header_fail;
1484 }
1485
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4 if (g2m_init_buffers(c)) {
1486 ret = AVERROR(ENOMEM);
1487 goto header_fail;
1488 }
1489 4 got_header = 1;
1490 4 break;
1491 237 case TILE_DATA:
1492
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237 if (!c->tiles_x || !c->tiles_y) {
1493 av_log(avctx, AV_LOG_WARNING,
1494 "No display info - skipping tile\n");
1495 break;
1496 }
1497
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237 if (chunk_size < 2) {
1498 av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
1499 chunk_size);
1500 break;
1501 }
1502 237 c->tile_x = bytestream2_get_byte(&bc);
1503 237 c->tile_y = bytestream2_get_byte(&bc);
1504
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237 if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
1505 av_log(avctx, AV_LOG_ERROR,
1506 "Invalid tile pos %d,%d (in %dx%d grid)\n",
1507 c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
1508 break;
1509 }
1510 237 ret = 0;
1511
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237 switch (c->compression) {
1512 136 case COMPR_EPIC_J_B:
1513 272 ret = epic_jb_decode_tile(c, c->tile_x, c->tile_y,
1514 136 buf + bytestream2_tell(&bc),
1515 136 chunk_size - 2, avctx);
1516 136 break;
1517 101 case COMPR_KEMPF_J_B:
1518 202 ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
1519 101 buf + bytestream2_tell(&bc),
1520 101 chunk_size - 2);
1521 101 break;
1522 }
1523
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237 if (ret && c->framebuf)
1524 av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
1525 c->tile_x, c->tile_y);
1526 237 break;
1527 245 case CURSOR_POS:
1528
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245 if (chunk_size < 5) {
1529 av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
1530 chunk_size);
1531 break;
1532 }
1533 245 c->cursor_x = bytestream2_get_be16(&bc);
1534 245 c->cursor_y = bytestream2_get_be16(&bc);
1535 245 break;
1536 14 case CURSOR_SHAPE:
1537
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14 if (chunk_size < 8) {
1538 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
1539 chunk_size);
1540 break;
1541 }
1542 14 bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
1543 14 chunk_size - 4);
1544 14 g2m_load_cursor(avctx, c, &tbc);
1545 14 break;
1546 14 case CHUNK_CC:
1547 case CHUNK_CD:
1548 14 break;
1549 default:
1550 av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
1551 chunk_type);
1552 }
1553
1554 /* navigate to next chunk */
1555 514 bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
1556 }
1557
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247 if (got_header)
1558 4 c->got_header = 1;
1559
1560
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247 if (c->width && c->height && c->framebuf) {
1561
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247 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
1562 return ret;
1563
1564 247 pic->key_frame = got_header;
1565
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247 pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
1566
1567
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210563 for (i = 0; i < avctx->height; i++)
1568 210316 memcpy(pic->data[0] + i * pic->linesize[0],
1569 210316 c->framebuf + i * c->framebuf_stride,
1570 210316 c->width * 3);
1571 247 g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
1572
1573 247 *got_picture_ptr = 1;
1574 }
1575
1576 247 return buf_size;
1577
1578 header_fail:
1579 c->width =
1580 c->height = 0;
1581 c->tiles_x =
1582 c->tiles_y = 0;
1583 c->tile_width =
1584 c->tile_height = 0;
1585 return ret;
1586 }
1587
1588 6 static av_cold int g2m_decode_init(AVCodecContext *avctx)
1589 {
1590 6 G2MContext *const c = avctx->priv_data;
1591 int ret;
1592
1593
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6 if ((ret = jpg_init(avctx, &c->jc)) != 0) {
1594 av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
1595 return AVERROR(ENOMEM);
1596 }
1597
1598 6 avctx->pix_fmt = AV_PIX_FMT_RGB24;
1599
1600 // store original sizes and check against those if resize happens
1601 6 c->orig_width = avctx->width;
1602 6 c->orig_height = avctx->height;
1603
1604 6 return 0;
1605 }
1606
1607 6 static av_cold int g2m_decode_end(AVCodecContext *avctx)
1608 {
1609 6 G2MContext *const c = avctx->priv_data;
1610
1611 6 jpg_free_context(&c->jc);
1612
1613 6 av_freep(&c->epic_buf_base);
1614 6 c->epic_buf = NULL;
1615 6 av_freep(&c->kempf_buf);
1616 6 av_freep(&c->kempf_flags);
1617 6 av_freep(&c->synth_tile);
1618 6 av_freep(&c->jpeg_tile);
1619 6 av_freep(&c->cursor);
1620 6 av_freep(&c->framebuf);
1621
1622 6 return 0;
1623 }
1624
1625 const FFCodec ff_g2m_decoder = {
1626 .p.name = "g2m",
1627 .p.long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
1628 .p.type = AVMEDIA_TYPE_VIDEO,
1629 .p.id = AV_CODEC_ID_G2M,
1630 .priv_data_size = sizeof(G2MContext),
1631 .init = g2m_decode_init,
1632 .close = g2m_decode_end,
1633 FF_CODEC_DECODE_CB(g2m_decode_frame),
1634 .p.capabilities = AV_CODEC_CAP_DR1,
1635 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
1636 };
1637