FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/g2meet.c
Date: 2021-09-16 08:47:15
Exec Total Coverage
Lines: 773 902 85.7%
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 "elsdec.h"
39 #include "get_bits.h"
40 #include "idctdsp.h"
41 #include "internal.h"
42 #include "jpegtables.h"
43 #include "mjpeg.h"
44 #include "mjpegdec.h"
45
46 #define EPIC_PIX_STACK_SIZE 1024
47 #define EPIC_PIX_STACK_MAX (EPIC_PIX_STACK_SIZE - 1)
48
49 enum ChunkType {
50 DISPLAY_INFO = 0xC8,
51 TILE_DATA,
52 CURSOR_POS,
53 CURSOR_SHAPE,
54 CHUNK_CC,
55 CHUNK_CD
56 };
57
58 enum Compression {
59 COMPR_EPIC_J_B = 2,
60 COMPR_KEMPF_J_B,
61 };
62
63 static const uint8_t luma_quant[64] = {
64 8, 6, 5, 8, 12, 20, 26, 31,
65 6, 6, 7, 10, 13, 29, 30, 28,
66 7, 7, 8, 12, 20, 29, 35, 28,
67 7, 9, 11, 15, 26, 44, 40, 31,
68 9, 11, 19, 28, 34, 55, 52, 39,
69 12, 18, 28, 32, 41, 52, 57, 46,
70 25, 32, 39, 44, 52, 61, 60, 51,
71 36, 46, 48, 49, 56, 50, 52, 50
72 };
73
74 static const uint8_t chroma_quant[64] = {
75 9, 9, 12, 24, 50, 50, 50, 50,
76 9, 11, 13, 33, 50, 50, 50, 50,
77 12, 13, 28, 50, 50, 50, 50, 50,
78 24, 33, 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 50, 50, 50, 50, 50, 50, 50, 50,
82 50, 50, 50, 50, 50, 50, 50, 50,
83 };
84
85 typedef struct ePICPixListElem {
86 struct ePICPixListElem *next;
87 uint32_t pixel;
88 uint8_t rung;
89 } ePICPixListElem;
90
91 typedef struct ePICPixHashElem {
92 uint32_t pix_id;
93 struct ePICPixListElem *list;
94 } ePICPixHashElem;
95
96 #define EPIC_HASH_SIZE 256
97 typedef struct ePICPixHash {
98 ePICPixHashElem *bucket[EPIC_HASH_SIZE];
99 int bucket_size[EPIC_HASH_SIZE];
100 int bucket_fill[EPIC_HASH_SIZE];
101 } ePICPixHash;
102
103 typedef struct ePICContext {
104 ElsDecCtx els_ctx;
105 int next_run_pos;
106 ElsUnsignedRung unsigned_rung;
107 uint8_t W_flag_rung;
108 uint8_t N_flag_rung;
109 uint8_t W_ctx_rung[256];
110 uint8_t N_ctx_rung[512];
111 uint8_t nw_pred_rung[256];
112 uint8_t ne_pred_rung[256];
113 uint8_t prev_row_rung[14];
114 uint8_t runlen_zeroes[14];
115 uint8_t runlen_one;
116 int stack_pos;
117 uint32_t stack[EPIC_PIX_STACK_SIZE];
118 ePICPixHash hash;
119 } ePICContext;
120
121 typedef struct JPGContext {
122 BlockDSPContext bdsp;
123 IDCTDSPContext idsp;
124 ScanTable scantable;
125
126 VLC dc_vlc[2], ac_vlc[2];
127 int prev_dc[3];
128 DECLARE_ALIGNED(32, int16_t, block)[6][64];
129
130 uint8_t *buf;
131 } JPGContext;
132
133 typedef struct G2MContext {
134 ePICContext ec;
135 JPGContext jc;
136
137 int version;
138
139 int compression;
140 int width, height, bpp;
141 int orig_width, orig_height;
142 int tile_width, tile_height;
143 int tiles_x, tiles_y, tile_x, tile_y;
144
145 int got_header;
146
147 uint8_t *framebuf;
148 int framebuf_stride, old_width, old_height;
149
150 uint8_t *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base;
151 int tile_stride, epic_buf_stride, old_tile_w, old_tile_h;
152 int swapuv;
153
154 uint8_t *kempf_buf, *kempf_flags;
155
156 uint8_t *cursor;
157 int cursor_stride;
158 int cursor_fmt;
159 int cursor_w, cursor_h, cursor_x, cursor_y;
160 int cursor_hot_x, cursor_hot_y;
161 } G2MContext;
162
163 6 static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
164 {
165 int ret;
166
167 6 ret = ff_mjpeg_build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
168 avpriv_mjpeg_val_dc, 0, avctx);
169
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6 if (ret)
170 return ret;
171 6 ret = ff_mjpeg_build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
172 avpriv_mjpeg_val_dc, 0, avctx);
173
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6 if (ret)
174 return ret;
175 6 ret = ff_mjpeg_build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
176 avpriv_mjpeg_val_ac_luminance, 1, avctx);
177
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6 if (ret)
178 return ret;
179 6 ret = ff_mjpeg_build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
180 avpriv_mjpeg_val_ac_chrominance, 1, avctx);
181
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6 if (ret)
182 return ret;
183
184 6 ff_blockdsp_init(&c->bdsp, avctx);
185 6 ff_idctdsp_init(&c->idsp, avctx);
186 6 ff_init_scantable(c->idsp.idct_permutation, &c->scantable,
187 ff_zigzag_direct);
188
189 6 return 0;
190 }
191
192 6 static av_cold void jpg_free_context(JPGContext *ctx)
193 {
194 int i;
195
196
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18 for (i = 0; i < 2; i++) {
197 12 ff_free_vlc(&ctx->dc_vlc[i]);
198 12 ff_free_vlc(&ctx->ac_vlc[i]);
199 }
200
201 6 av_freep(&ctx->buf);
202 6 }
203
204 159 static void jpg_unescape(const uint8_t *src, int src_size,
205 uint8_t *dst, int *dst_size)
206 {
207 159 const uint8_t *src_end = src + src_size;
208 159 uint8_t *dst_start = dst;
209
210
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155218 while (src < src_end) {
211 155059 uint8_t x = *src++;
212
213 155059 *dst++ = x;
214
215
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155059 if (x == 0xFF && !*src)
216 893 src++;
217 }
218 159 *dst_size = dst - dst_start;
219 159 }
220
221 38284 static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
222 int plane, int16_t *block)
223 {
224 int dc, val, pos;
225 38284 const int is_chroma = !!plane;
226
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38284 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
227
228
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38284 if (get_bits_left(gb) < 1)
229 return AVERROR_INVALIDDATA;
230
231 38284 c->bdsp.clear_block(block);
232 38284 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 2);
233
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38284 if (dc < 0)
234 return AVERROR_INVALIDDATA;
235
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38284 if (dc)
236 22214 dc = get_xbits(gb, dc);
237 38284 dc = dc * qmat[0] + c->prev_dc[plane];
238 38284 block[0] = dc;
239 38284 c->prev_dc[plane] = dc;
240
241 38284 pos = 0;
242
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225358 while (pos < 63) {
243 224976 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 2);
244
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224976 if (val < 0)
245 return AVERROR_INVALIDDATA;
246 224976 pos += val >> 4;
247 224976 val &= 0xF;
248
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224976 if (pos > 63)
249
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37902 return val ? AVERROR_INVALIDDATA : 0;
250
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187074 if (val) {
251 186680 int nbits = val;
252
253 186680 val = get_xbits(gb, nbits);
254 186680 val *= qmat[ff_zigzag_direct[pos]];
255 186680 block[c->scantable.permutated[pos]] = val;
256 }
257 }
258 382 return 0;
259 }
260
261 1684224 static inline void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
262 {
263 1684224 out[ridx] = av_clip_uint8(Y + (91881 * V + 32768 >> 16));
264 1684224 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
265 1684224 out[2 - ridx] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
266 1684224 }
267
268 159 static int jpg_decode_data(JPGContext *c, int width, int height,
269 const uint8_t *src, int src_size,
270 uint8_t *dst, int dst_stride,
271 const uint8_t *mask, int mask_stride, int num_mbs,
272 int swapuv)
273 {
274 GetBitContext gb;
275 int mb_w, mb_h, mb_x, mb_y, i, j;
276 int bx, by;
277 int unesc_size;
278 int ret;
279
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159 const int ridx = swapuv ? 2 : 0;
280
281
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159 if ((ret = av_reallocp(&c->buf,
282 159 src_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0)
283 return ret;
284 159 jpg_unescape(src, src_size, c->buf, &unesc_size);
285 159 memset(c->buf + unesc_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
286
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159 if((ret = init_get_bits8(&gb, c->buf, unesc_size)) < 0)
287 return ret;
288
289 159 width = FFALIGN(width, 16);
290 159 mb_w = width >> 4;
291 159 mb_h = (height + 15) >> 4;
292
293
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159 if (!num_mbs)
294 num_mbs = mb_w * mb_h * 4;
295
296
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636 for (i = 0; i < 3; i++)
297 477 c->prev_dc[i] = 1024;
298 159 bx =
299 159 by = 0;
300 159 c->bdsp.clear_blocks(c->block[0]);
301
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1069 for (mb_y = 0; mb_y < mb_h; mb_y++) {
302
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11926 for (mb_x = 0; mb_x < mb_w; mb_x++) {
303
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11016 if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
304
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4574 !mask[mb_x * 2 + mask_stride] &&
305
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4458 !mask[mb_x * 2 + 1 + mask_stride]) {
306 4437 bx += 16;
307 4437 continue;
308 }
309
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19737 for (j = 0; j < 2; j++) {
310
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39474 for (i = 0; i < 2; i++) {
311
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26316 if (mask && !mask[mb_x * 2 + i + j * mask_stride])
312 1190 continue;
313 25126 num_mbs--;
314
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25126 if ((ret = jpg_decode_block(c, &gb, 0,
315 25126 c->block[i + j * 2])) != 0)
316 return ret;
317 25126 c->idsp.idct(c->block[i + j * 2]);
318 }
319 }
320
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19737 for (i = 1; i < 3; i++) {
321
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13158 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
322 return ret;
323 13158 c->idsp.idct(c->block[i + 3]);
324 }
325
326
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111843 for (j = 0; j < 16; j++) {
327 105264 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
328
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1789488 for (i = 0; i < 16; i++) {
329 int Y, U, V;
330
331 1684224 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
332 1684224 U = c->block[4][(i >> 1) + (j >> 1) * 8] - 128;
333 1684224 V = c->block[5][(i >> 1) + (j >> 1) * 8] - 128;
334 1684224 yuv2rgb(out + i * 3, ridx, Y, U, V);
335 }
336 }
337
338
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6579 if (!num_mbs)
339 159 return 0;
340 6420 bx += 16;
341 }
342 910 bx = 0;
343 910 by += 16;
344
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910 if (mask)
345 910 mask += mask_stride * 2;
346 }
347
348 return 0;
349 }
350
351 #define LOAD_NEIGHBOURS(x) \
352 W = curr_row[(x) - 1]; \
353 N = above_row[(x)]; \
354 WW = curr_row[(x) - 2]; \
355 NW = above_row[(x) - 1]; \
356 NE = above_row[(x) + 1]; \
357 NN = above2_row[(x)]; \
358 NNW = above2_row[(x) - 1]; \
359 NWW = above_row[(x) - 2]; \
360 NNE = above2_row[(x) + 1]
361
362 #define UPDATE_NEIGHBOURS(x) \
363 NNW = NN; \
364 NN = NNE; \
365 NWW = NW; \
366 NW = N; \
367 N = NE; \
368 NE = above_row[(x) + 1]; \
369 NNE = above2_row[(x) + 1]
370
371 #define R_shift 16
372 #define G_shift 8
373 #define B_shift 0
374
375 /* improved djb2 hash from http://www.cse.yorku.ca/~oz/hash.html */
376 97781 static int djb2_hash(uint32_t key)
377 {
378 97781 uint32_t h = 5381;
379
380 97781 h = (h * 33) ^ ((key >> 24) & 0xFF); // xxx: probably not needed at all
381 97781 h = (h * 33) ^ ((key >> 16) & 0xFF);
382 97781 h = (h * 33) ^ ((key >> 8) & 0xFF);
383 97781 h = (h * 33) ^ (key & 0xFF);
384
385 97781 return h & (EPIC_HASH_SIZE - 1);
386 }
387
388 136 static void epic_hash_init(ePICPixHash *hash)
389 {
390 136 memset(hash, 0, sizeof(*hash));
391 136 }
392
393 97247 static ePICPixHashElem *epic_hash_find(const ePICPixHash *hash, uint32_t key)
394 {
395 97247 int i, idx = djb2_hash(key);
396 97247 ePICPixHashElem *bucket = hash->bucket[idx];
397
398
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97299 for (i = 0; i < hash->bucket_fill[idx]; i++)
399
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94232 if (bucket[i].pix_id == key)
400 94180 return &bucket[i];
401
402 3067 return NULL;
403 }
404
405 534 static ePICPixHashElem *epic_hash_add(ePICPixHash *hash, uint32_t key)
406 {
407 ePICPixHashElem *bucket, *ret;
408 534 int idx = djb2_hash(key);
409
410
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534 if (hash->bucket_size[idx] > INT_MAX / sizeof(**hash->bucket))
411 return NULL;
412
413
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534 if (!(hash->bucket_fill[idx] < hash->bucket_size[idx])) {
414 531 int new_size = hash->bucket_size[idx] + 16;
415 531 bucket = av_realloc(hash->bucket[idx], new_size * sizeof(*bucket));
416
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531 if (!bucket)
417 return NULL;
418 531 hash->bucket[idx] = bucket;
419 531 hash->bucket_size[idx] = new_size;
420 }
421
422 534 ret = &hash->bucket[idx][hash->bucket_fill[idx]++];
423 534 memset(ret, 0, sizeof(*ret));
424 534 ret->pix_id = key;
425 534 return ret;
426 }
427
428 1658 static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
429 {
430 ePICPixListElem *new_elem;
431 1658 ePICPixHashElem *hash_elem = epic_hash_find(hash, key);
432
433
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1658 if (!hash_elem) {
434
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534 if (!(hash_elem = epic_hash_add(hash, key)))
435 return AVERROR(ENOMEM);
436 }
437
438 1658 new_elem = av_mallocz(sizeof(*new_elem));
439
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1658 if (!new_elem)
440 return AVERROR(ENOMEM);
441
442 1658 new_elem->pixel = pix;
443 1658 new_elem->next = hash_elem->list;
444 1658 hash_elem->list = new_elem;
445
446 1658 return 0;
447 }
448
449 41955 static inline int epic_cache_entries_for_pixel(const ePICPixHash *hash,
450 uint32_t pix)
451 {
452 41955 ePICPixHashElem *hash_elem = epic_hash_find(hash, pix);
453
454
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41955 if (hash_elem != NULL && hash_elem->list != NULL)
455 39956 return 1;
456
457 1999 return 0;
458 }
459
460 136 static void epic_free_pixel_cache(ePICPixHash *hash)
461 {
462 int i, j;
463
464
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34952 for (i = 0; i < EPIC_HASH_SIZE; i++) {
465
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35350 for (j = 0; j < hash->bucket_fill[i]; j++) {
466 534 ePICPixListElem *list_elem = hash->bucket[i][j].list;
467
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2192 while (list_elem) {
468 1658 ePICPixListElem *tmp = list_elem->next;
469 1658 av_free(list_elem);
470 1658 list_elem = tmp;
471 }
472 }
473 34816 av_freep(&hash->bucket[i]);
474 34816 hash->bucket_size[i] =
475 34816 hash->bucket_fill[i] = 0;
476 }
477 136 }
478
479 510904 static inline int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
480 {
481 int i;
482
483
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1163688 for (i = 0; i < dc->stack_pos; i++)
484
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806184 if (dc->stack[i] == pix)
485 153400 break;
486
487 510904 return i != dc->stack_pos;
488 }
489
490 #define TOSIGNED(val) (((val) >> 1) ^ -((val) & 1))
491
492 9558 static inline int epic_decode_component_pred(ePICContext *dc,
493 int N, int W, int NW)
494 {
495 9558 unsigned delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
496 9558 return mid_pred(N, N + W - NW, W) - TOSIGNED(delta);
497 }
498
499 4739 static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y,
500 const uint32_t *curr_row,
501 const uint32_t *above_row)
502 {
503 uint32_t N, W, NW, pred;
504 unsigned delta;
505 int GN, GW, GNW, R, G, B;
506
507
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4739 if (x && y) {
508 3186 W = curr_row[x - 1];
509 3186 N = above_row[x];
510 3186 NW = above_row[x - 1];
511
512 3186 GN = (N >> G_shift) & 0xFF;
513 3186 GW = (W >> G_shift) & 0xFF;
514 3186 GNW = (NW >> G_shift) & 0xFF;
515
516 3186 G = epic_decode_component_pred(dc, GN, GW, GNW);
517
518 6372 R = G + epic_decode_component_pred(dc,
519 3186 ((N >> R_shift) & 0xFF) - GN,
520 3186 ((W >> R_shift) & 0xFF) - GW,
521 3186 ((NW >> R_shift) & 0xFF) - GNW);
522
523 3186 B = G + epic_decode_component_pred(dc,
524 3186 ((N >> B_shift) & 0xFF) - GN,
525 3186 ((W >> B_shift) & 0xFF) - GW,
526 3186 ((NW >> B_shift) & 0xFF) - GNW);
527 } else {
528
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1553 if (x)
529 471 pred = curr_row[x - 1];
530 else
531 1082 pred = above_row[x];
532
533 1553 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
534 1553 R = ((pred >> R_shift) & 0xFF) - TOSIGNED(delta);
535
536 1553 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
537 1553 G = ((pred >> G_shift) & 0xFF) - TOSIGNED(delta);
538
539 1553 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
540 1553 B = ((pred >> B_shift) & 0xFF) - TOSIGNED(delta);
541 }
542
543
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4739 if (R<0 || G<0 || B<0 || R > 255 || G > 255 || B > 255) {
544 avpriv_request_sample(NULL, "RGB %d %d %d (out of range)", R, G, B);
545 return 0;
546 }
547
548 4739 return (R << R_shift) | (G << G_shift) | (B << B_shift);
549 }
550
551 99449 static int epic_predict_pixel(ePICContext *dc, uint8_t *rung,
552 uint32_t *pPix, uint32_t pix)
553 {
554
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✓ Branch 2 taken 8365 times.
99449 if (!ff_els_decode_bit(&dc->els_ctx, rung)) {
555 91084 *pPix = pix;
556 91084 return 1;
557 }
558 8365 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
559 8365 return 0;
560 }
561
562 95756 static int epic_handle_edges(ePICContext *dc, int x, int y,
563 const uint32_t *curr_row,
564 const uint32_t *above_row, uint32_t *pPix)
565 {
566 uint32_t pix;
567
568
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95756 if (!x && !y) { /* special case: top-left pixel */
569 /* the top-left pixel is coded independently with 3 unsigned numbers */
570 136 *pPix = (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << R_shift) |
571 136 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << G_shift) |
572 136 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << B_shift);
573 136 return 1;
574 }
575
576
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95620 if (x) { /* predict from W first */
577 78572 pix = curr_row[x - 1];
578
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78572 if (epic_predict_pixel(dc, &dc->W_flag_rung, pPix, pix))
579 72049 return 1;
580 }
581
582
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23571 if (y) { /* then try to predict from N */
583 22080 pix = above_row[x];
584
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22080 if (!dc->stack_pos || dc->stack[0] != pix) {
585
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20877 if (epic_predict_pixel(dc, &dc->N_flag_rung, pPix, pix))
586 19035 return 1;
587 }
588 }
589
590 4536 return 0;
591 }
592
593 218240 static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width,
594 const uint32_t *curr_row,
595 const uint32_t *above_row,
596 const uint32_t *above2_row,
597 uint32_t *pPix, int *pRun)
598 {
599 218240 int idx, got_pixel = 0, WWneW, old_WWneW = 0;
600 uint32_t W, WW, N, NN, NW, NE, NWW, NNW, NNE;
601
602 218240 *pRun = 0;
603
604 218240 LOAD_NEIGHBOURS(x);
605
606
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218240 if (dc->next_run_pos == x) {
607 /* can't reuse W for the new pixel in this case */
608 199455 WWneW = 1;
609 } else {
610
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18785 idx = (WW != W) << 7 |
611
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18785 (NW != W) << 6 |
612
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18785 (N != NE) << 5 |
613
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18785 (NW != N) << 4 |
614
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18785 (NWW != NW) << 3 |
615
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✓ Branch 1 taken 16816 times.
18785 (NNE != NE) << 2 |
616
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✓ Branch 1 taken 16902 times.
18785 (NN != N) << 1 |
617 18785 (NNW != NW);
618 18785 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
619
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18785 if (WWneW < 0)
620 return WWneW;
621 }
622
623
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218240 if (WWneW)
624 201691 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = W;
625 else {
626 16549 *pPix = W;
627 16549 got_pixel = 1;
628 }
629
630 do {
631 503572 int NWneW = 1;
632
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503572 if (got_pixel) // pixel value already known (derived from either W or N)
633 237740 NWneW = *pPix != N;
634 else { // pixel value is unknown and will be decoded later
635
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265832 NWneW = *pRun ? NWneW : NW != W;
636
637 /* TODO: RFC this mess! */
638
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265832 switch (((NW != N) << 2) | (NWneW << 1) | WWneW) {
639 case 0:
640 break; // do nothing here
641 176548 case 3:
642 case 5:
643 case 6:
644 case 7:
645
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176548 if (!is_pixel_on_stack(dc, N)) {
646 457674 idx = WWneW << 8 |
647
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152558 (*pRun ? old_WWneW : WW != W) << 7 |
648 305116 NWneW << 6 |
649
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152558 (N != NE) << 5 |
650
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152558 (NW != N) << 4 |
651
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152558 (NWW != NW) << 3 |
652
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152558 (NNE != NE) << 2 |
653
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152558 (NN != N) << 1 |
654 152558 (NNW != NW);
655
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152558 if (!ff_els_decode_bit(&dc->els_ctx, &dc->N_ctx_rung[idx])) {
656 129319 NWneW = 0;
657 129319 *pPix = N;
658 129319 got_pixel = 1;
659 129319 break;
660 }
661 }
662 /* fall through */
663 default:
664 136513 NWneW = 1;
665 136513 old_WWneW = WWneW;
666
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136513 if (!is_pixel_on_stack(dc, N))
667 23239 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = N;
668 }
669 }
670
671 503572 (*pRun)++;
672
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503572 if (x + *pRun >= tile_width - 1)
673 3378 break;
674
675 500194 UPDATE_NEIGHBOURS(x + *pRun);
676
677
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500194 if (!NWneW && NW == N && N == NE) {
678 int pos, run, rle;
679 99184 int start_pos = x + *pRun;
680
681 /* scan for a run of pix in the line above */
682 99184 uint32_t pix = above_row[start_pos + 1];
683
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2511691 for (pos = start_pos + 2; pos < tile_width; pos++)
684
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2496269 if (!(above_row[pos] == pix))
685 83762 break;
686 99184 run = pos - start_pos - 1;
687 99184 idx = av_ceil_log2(run);
688
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99184 if (ff_els_decode_bit(&dc->els_ctx, &dc->prev_row_rung[idx]))
689 66738 *pRun += run;
690 else {
691 int flag;
692 /* run-length is coded as plain binary number of idx - 1 bits */
693
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131763 for (pos = idx - 1, rle = 0, flag = 0; pos >= 0; pos--) {
694
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193930 if ((1 << pos) + rle < run &&
695
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94613 ff_els_decode_bit(&dc->els_ctx,
696 flag ? &dc->runlen_one
697 : &dc->runlen_zeroes[pos])) {
698 33844 flag = 1;
699 33844 rle |= 1 << pos;
700 }
701 }
702 32446 *pRun += rle;
703 32446 break; // return immediately
704 }
705
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66738 if (x + *pRun >= tile_width - 1)
706 13519 break;
707
708 53219 LOAD_NEIGHBOURS(x + *pRun);
709 53219 WWneW = 0;
710 53219 NWneW = 0;
711 }
712
713 908458 idx = WWneW << 7 |
714 908458 NWneW << 6 |
715
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454229 (N != NE) << 5 |
716
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454229 (NW != N) << 4 |
717
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454229 (NWW != NW) << 3 |
718
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454229 (NNE != NE) << 2 |
719
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454229 (NN != N) << 1 |
720 454229 (NNW != NW);
721 454229 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
722
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454229 } while (!WWneW);
723
724 218240 dc->next_run_pos = x + *pRun;
725 218240 return got_pixel;
726 }
727
728 36049 static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung,
729 uint32_t *pPix, uint32_t pix)
730 {
731
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36049 if (ff_els_decode_bit(&dc->els_ctx, rung)) {
732 22192 *pPix = pix;
733 22192 return 1;
734 }
735 13857 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
736 13857 return 0;
737 }
738
739 76908 static int epic_predict_from_NW_NE(ePICContext *dc, int x, int y, int run,
740 int tile_width, const uint32_t *curr_row,
741 const uint32_t *above_row, uint32_t *pPix)
742 {
743 int pos;
744
745 /* try to reuse the NW pixel first */
746
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76908 if (x && y) {
747 73974 uint32_t NW = above_row[x - 1];
748
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73974 if (NW != curr_row[x - 1] && NW != above_row[x] && !is_pixel_on_stack(dc, NW)) {
749
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20189 if (epic_predict_pixel2(dc, &dc->nw_pred_rung[NW & 0xFF], pPix, NW))
750 12191 return 1;
751 }
752 }
753
754 /* try to reuse the NE[x + run, y] pixel */
755 64717 pos = x + run - 1;
756
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64717 if (pos < tile_width - 1 && y) {
757 62826 uint32_t NE = above_row[pos + 1];
758
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62826 if (NE != above_row[pos] && !is_pixel_on_stack(dc, NE)) {
759
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15860 if (epic_predict_pixel2(dc, &dc->ne_pred_rung[NE & 0xFF], pPix, NE))
760 10001 return 1;
761 }
762 }
763
764 54716 return 0;
765 }
766
767 53634 static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix)
768 {
769 53634 ePICPixListElem *list, *prev = NULL;
770 53634 ePICPixHashElem *hash_elem = epic_hash_find(&dc->hash, W);
771
772
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53634 if (!hash_elem || !hash_elem->list)
773 534 return 0;
774
775 53100 list = hash_elem->list;
776
2/2
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154706 while (list) {
777
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153582 if (!is_pixel_on_stack(dc, list->pixel)) {
778
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142918 if (ff_els_decode_bit(&dc->els_ctx, &list->rung)) {
779 51976 *pPix = list->pixel;
780
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51976 if (list != hash_elem->list) {
781 36609 prev->next = list->next;
782 36609 list->next = hash_elem->list;
783 36609 hash_elem->list = list;
784 }
785 51976 return 1;
786 }
787 90942 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = list->pixel;
788 }
789 101606 prev = list;
790 101606 list = list->next;
791 }
792
793 1124 return 0;
794 }
795
796 136 static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height,
797 int tile_width, int stride)
798 {
799 int x, y;
800 uint32_t pix;
801 136 uint32_t *curr_row = NULL, *above_row = NULL, *above2_row;
802
803
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17320 for (y = 0; y < tile_height; y++, out += stride) {
804 17184 above2_row = above_row;
805 17184 above_row = curr_row;
806 17184 curr_row = (uint32_t *) out;
807
808
2/2
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333179 for (x = 0, dc->next_run_pos = 0; x < tile_width;) {
809
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315995 if (dc->els_ctx.err)
810 return AVERROR_INVALIDDATA; // bail out in the case of ELS overflow
811
812 315995 pix = curr_row[x - 1]; // get W pixel
813
814
4/4
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315995 if (y >= 1 && x >= 2 &&
815
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259371 pix != curr_row[x - 2] && pix != above_row[x - 1] &&
816
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101123 pix != above_row[x - 2] && pix != above_row[x] &&
817 41955 !epic_cache_entries_for_pixel(&dc->hash, pix)) {
818 1999 curr_row[x] = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
819 1999 x++;
820 } else {
821 int got_pixel, run;
822 313996 dc->stack_pos = 0; // empty stack
823
824
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313996 if (y < 2 || x < 2 || x == tile_width - 1) {
825 95756 run = 1;
826 95756 got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix);
827 } else {
828 218240 got_pixel = epic_decode_run_length(dc, x, y, tile_width,
829 curr_row, above_row,
830 above2_row, &pix, &run);
831
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218240 if (got_pixel < 0)
832 return got_pixel;
833 }
834
835
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313996 if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run,
836 tile_width, curr_row,
837 above_row, &pix)) {
838 54716 uint32_t ref_pix = curr_row[x - 1];
839
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54716 if (!x || !epic_decode_from_cache(dc, ref_pix, &pix)) {
840 2740 pix = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
841
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2740 if (is_pixel_on_stack(dc, pix))
842 return AVERROR_INVALIDDATA;
843
844
2/2
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2740 if (x) {
845 1658 int ret = epic_add_pixel_to_cache(&dc->hash,
846 ref_pix,
847 pix);
848
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1658 if (ret)
849 return ret;
850 }
851 }
852 }
853
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3159741 for (; run > 0; x++, run--)
854 2845745 curr_row[x] = pix;
855 }
856 }
857 }
858
859 136 return 0;
860 }
861
862 136 static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y,
863 const uint8_t *src, size_t src_size,
864 AVCodecContext *avctx)
865 {
866 136 uint8_t prefix, mask = 0x80;
867 int extrabytes, tile_width, tile_height, awidth, aheight;
868 size_t els_dsize;
869 uint8_t *dst;
870
871
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136 if (!src_size)
872 return 0;
873
874 /* get data size of the ELS partition as unsigned variable-length integer */
875 136 prefix = *src++;
876 136 src_size--;
877
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224 for (extrabytes = 0; (prefix & mask) && (extrabytes < 7); extrabytes++)
878 88 mask >>= 1;
879
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136 if (extrabytes > 3 || src_size < extrabytes) {
880 av_log(avctx, AV_LOG_ERROR, "ePIC: invalid data size VLI\n");
881 return AVERROR_INVALIDDATA;
882 }
883
884 136 els_dsize = prefix & ((0x80 >> extrabytes) - 1); // mask out the length prefix
885
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224 while (extrabytes-- > 0) {
886 88 els_dsize = (els_dsize << 8) | *src++;
887 88 src_size--;
888 }
889
890
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136 if (src_size < els_dsize) {
891 av_log(avctx, AV_LOG_ERROR, "ePIC: data too short, needed %"SIZE_SPECIFIER", got %"SIZE_SPECIFIER"\n",
892 els_dsize, src_size);
893 return AVERROR_INVALIDDATA;
894 }
895
896 136 tile_width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
897 136 tile_height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
898 136 awidth = FFALIGN(tile_width, 16);
899 136 aheight = FFALIGN(tile_height, 16);
900
901
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136 if (tile_width > (1 << FF_ARRAY_ELEMS(c->ec.prev_row_rung))) {
902 avpriv_request_sample(avctx, "large tile width");
903 return AVERROR_INVALIDDATA;
904 }
905
906
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136 if (els_dsize) {
907 int ret, i, j, k;
908 uint8_t tr_r, tr_g, tr_b, *buf;
909 uint32_t *in;
910 /* ELS decoder initializations */
911 136 memset(&c->ec, 0, sizeof(c->ec));
912 136 ff_els_decoder_init(&c->ec.els_ctx, src, els_dsize);
913 136 epic_hash_init(&c->ec.hash);
914
915 /* decode transparent pixel value */
916 136 tr_r = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
917 136 tr_g = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
918 136 tr_b = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
919
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136 if (c->ec.els_ctx.err != 0) {
920 av_log(avctx, AV_LOG_ERROR,
921 "ePIC: couldn't decode transparency pixel!\n");
922 ff_els_decoder_uninit(&c->ec.unsigned_rung);
923 return AVERROR_INVALIDDATA;
924 }
925
926 136 ret = epic_decode_tile(&c->ec, c->epic_buf, tile_height, tile_width,
927 c->epic_buf_stride);
928
929 136 epic_free_pixel_cache(&c->ec.hash);
930 136 ff_els_decoder_uninit(&c->ec.unsigned_rung);
931
932
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136 if (ret) {
933 av_log(avctx, AV_LOG_ERROR,
934 "ePIC: tile decoding failed, frame=%d, tile_x=%d, tile_y=%d\n",
935 avctx->frame_number, tile_x, tile_y);
936 return AVERROR_INVALIDDATA;
937 }
938
939 136 buf = c->epic_buf;
940 136 dst = c->framebuf + tile_x * c->tile_width * 3 +
941 136 tile_y * c->tile_height * c->framebuf_stride;
942
943
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17320 for (j = 0; j < tile_height; j++) {
944 17184 uint8_t *out = dst;
945 17184 in = (uint32_t *) buf;
946
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2864928 for (i = 0; i < tile_width; i++) {
947 2847744 out[0] = (in[i] >> R_shift) & 0xFF;
948 2847744 out[1] = (in[i] >> G_shift) & 0xFF;
949 2847744 out[2] = (in[i] >> B_shift) & 0xFF;
950 2847744 out += 3;
951 }
952 17184 buf += c->epic_buf_stride;
953 17184 dst += c->framebuf_stride;
954 }
955
956
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136 if (src_size > els_dsize) {
957 uint8_t *jpg;
958 uint32_t tr;
959 92 int bstride = FFALIGN(tile_width, 16) >> 3;
960 92 int nblocks = 0;
961 92 int estride = c->epic_buf_stride >> 2;
962
963 92 src += els_dsize;
964 92 src_size -= els_dsize;
965
966 92 in = (uint32_t *) c->epic_buf;
967 92 tr = (tr_r << R_shift) | (tr_g << G_shift) | (tr_b << B_shift);
968
969 92 memset(c->kempf_flags, 0,
970 92 (aheight >> 3) * bstride * sizeof(*c->kempf_flags));
971
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1543 for (j = 0; j < tile_height; j += 8) {
972
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32605 for (i = 0; i < tile_width; i += 8) {
973 31154 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 0;
974
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1113006 for (k = 0; k < 8 * 8; k++) {
975
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1096594 if (in[i + (k & 7) + (k >> 3) * estride] == tr) {
976 14742 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 1;
977 14742 nblocks++;
978 14742 break;
979 }
980 }
981 }
982 1451 in += 8 * estride;
983 }
984
985 92 memset(c->jpeg_tile, 0, c->tile_stride * aheight);
986 92 jpg_decode_data(&c->jc, awidth, aheight, src, src_size,
987 c->jpeg_tile, c->tile_stride,
988 92 c->kempf_flags, bstride, nblocks, c->swapuv);
989
990 92 in = (uint32_t *) c->epic_buf;
991 92 dst = c->framebuf + tile_x * c->tile_width * 3 +
992 92 tile_y * c->tile_height * c->framebuf_stride;
993 92 jpg = c->jpeg_tile;
994
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11672 for (j = 0; j < tile_height; j++) {
995
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2000508 for (i = 0; i < tile_width; i++)
996
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1988928 if (in[i] == tr)
997 717442 memcpy(dst + i * 3, jpg + i * 3, 3);
998 11580 in += c->epic_buf_stride >> 2;
999 11580 dst += c->framebuf_stride;
1000 11580 jpg += c->tile_stride;
1001 }
1002 }
1003 } else {
1004 dst = c->framebuf + tile_x * c->tile_width * 3 +
1005 tile_y * c->tile_height * c->framebuf_stride;
1006 return jpg_decode_data(&c->jc, tile_width, tile_height, src, src_size,
1007 dst, c->framebuf_stride, NULL, 0, 0, c->swapuv);
1008 }
1009
1010 136 return 0;
1011 }
1012
1013 81 static int kempf_restore_buf(const uint8_t *src, int len,
1014 uint8_t *dst, int stride,
1015 const uint8_t *jpeg_tile, int tile_stride,
1016 int width, int height,
1017 const uint8_t *pal, int npal, int tidx)
1018 {
1019 GetBitContext gb;
1020 int i, j, nb, col;
1021 int ret;
1022 81 int align_width = FFALIGN(width, 16);
1023
1024
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81 if ((ret = init_get_bits8(&gb, src, len)) < 0)
1025 return ret;
1026
1027
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81 if (npal <= 2) nb = 1;
1028
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81 else if (npal <= 4) nb = 2;
1029
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66 else if (npal <= 16) nb = 4;
1030 29 else nb = 8;
1031
1032
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10449 for (j = 0; j < height; j++, dst += stride, jpeg_tile = FF_PTR_ADD(jpeg_tile, tile_stride)) {
1033
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10368 if (get_bits(&gb, 8))
1034 continue;
1035
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1654912 for (i = 0; i < width; i++) {
1036 1644544 col = get_bits(&gb, nb);
1037
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1644544 if (col != tidx)
1038 1323579 memcpy(dst + i * 3, pal + col * 3, 3);
1039 else
1040 320965 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
1041 }
1042 10368 skip_bits_long(&gb, nb * (align_width - width));
1043 }
1044
1045 81 return 0;
1046 }
1047
1048 101 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
1049 const uint8_t *src, int src_size)
1050 {
1051 int width, height;
1052 101 int hdr, zsize, npal, tidx = -1, ret;
1053 int i, j;
1054 101 const uint8_t *src_end = src + src_size;
1055 uint8_t pal[768], transp[3];
1056 101 uLongf dlen = (c->tile_width + 1) * c->tile_height;
1057 int sub_type;
1058 int nblocks, cblocks, bstride;
1059 int bits, bitbuf, coded;
1060 101 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
1061 101 tile_y * c->tile_height * c->framebuf_stride;
1062
1063
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101 if (src_size < 2)
1064 return AVERROR_INVALIDDATA;
1065
1066 101 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
1067 101 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
1068
1069 101 hdr = *src++;
1070 101 sub_type = hdr >> 5;
1071
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101 if (sub_type == 0) {
1072 int j;
1073 20 memcpy(transp, src, 3);
1074 20 src += 3;
1075
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2580 for (j = 0; j < height; j++, dst += c->framebuf_stride)
1076
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403968 for (i = 0; i < width; i++)
1077 401408 memcpy(dst + i * 3, transp, 3);
1078 20 return 0;
1079
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81 } else if (sub_type == 1) {
1080 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
1081 dst, c->framebuf_stride, NULL, 0, 0, 0);
1082 }
1083
1084
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81 if (sub_type != 2) {
1085 67 memcpy(transp, src, 3);
1086 67 src += 3;
1087 }
1088 81 npal = *src++ + 1;
1089
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81 if (src_end - src < npal * 3)
1090 return AVERROR_INVALIDDATA;
1091 81 memcpy(pal, src, npal * 3);
1092 81 src += npal * 3;
1093
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81 if (sub_type != 2) {
1094
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134 for (i = 0; i < npal; i++) {
1095
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134 if (!memcmp(pal + i * 3, transp, 3)) {
1096 67 tidx = i;
1097 67 break;
1098 }
1099 }
1100 }
1101
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81 if (src_end - src < 2)
1103 return 0;
1104 81 zsize = (src[0] << 8) | src[1];
1105 81 src += 2;
1106
1107
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81 if (src_end - src < zsize + (sub_type != 2))
1108 return AVERROR_INVALIDDATA;
1109
1110 81 ret = uncompress(c->kempf_buf, &dlen, src, zsize);
1111
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81 if (ret)
1112 return AVERROR_INVALIDDATA;
1113 81 src += zsize;
1114
1115
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81 if (sub_type == 2) {
1116 14 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1117 NULL, 0, width, height, pal, npal, tidx);
1118 14 return 0;
1119 }
1120
1121 67 nblocks = *src++ + 1;
1122 67 cblocks = 0;
1123 67 bstride = FFALIGN(width, 16) >> 3;
1124 // blocks are coded LSB and we need normal bitreader for JPEG data
1125 67 bits = 0;
1126
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603 for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
1127
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5984 for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
1128
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5448 if (!bits) {
1129
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681 if (src >= src_end)
1130 return AVERROR_INVALIDDATA;
1131 681 bitbuf = *src++;
1132 681 bits = 8;
1133 }
1134 5448 coded = bitbuf & 1;
1135 5448 bits--;
1136 5448 bitbuf >>= 1;
1137 5448 cblocks += coded;
1138
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5448 if (cblocks > nblocks)
1139 return AVERROR_INVALIDDATA;
1140 5448 c->kempf_flags[j * 2 + i * 2 * bstride] =
1141 5448 c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
1142 5448 c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
1143 5448 c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
1144 }
1145 }
1146
1147 67 memset(c->jpeg_tile, 0, c->tile_stride * height);
1148 67 jpg_decode_data(&c->jc, width, height, src, src_end - src,
1149 c->jpeg_tile, c->tile_stride,
1150 67 c->kempf_flags, bstride, nblocks * 4, 0);
1151
1152 67 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1153 67 c->jpeg_tile, c->tile_stride,
1154 width, height, pal, npal, tidx);
1155
1156 67 return 0;
1157 }
1158
1159 4 static int g2m_init_buffers(G2MContext *c)
1160 {
1161 int aligned_height;
1162
1163
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4 if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
1164 4 c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
1165 4 aligned_height = c->height + 15;
1166 4 av_free(c->framebuf);
1167 4 c->framebuf = av_mallocz_array(c->framebuf_stride, aligned_height);
1168
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4 if (!c->framebuf)
1169 return AVERROR(ENOMEM);
1170 }
1171
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4 if (!c->synth_tile || !c->jpeg_tile ||
1172
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1 (c->compression == 2 && !c->epic_buf_base) ||
1173
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1 c->old_tile_w < c->tile_width ||
1174 c->old_tile_h < c->tile_height) {
1175 4 c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
1176 4 c->epic_buf_stride = FFALIGN(c->tile_width * 4, 16);
1177 4 aligned_height = FFALIGN(c->tile_height, 16);
1178 4 av_freep(&c->synth_tile);
1179 4 av_freep(&c->jpeg_tile);
1180 4 av_freep(&c->kempf_buf);
1181 4 av_freep(&c->kempf_flags);
1182 4 av_freep(&c->epic_buf_base);
1183 4 c->epic_buf = NULL;
1184 4 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
1185 4 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
1186 4 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height +
1187 AV_INPUT_BUFFER_PADDING_SIZE);
1188 4 c->kempf_flags = av_mallocz(c->tile_width * aligned_height);
1189
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4 if (!c->synth_tile || !c->jpeg_tile ||
1190
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4 !c->kempf_buf || !c->kempf_flags)
1191 return AVERROR(ENOMEM);
1192
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4 if (c->compression == 2) {
1193 3 c->epic_buf_base = av_mallocz(c->epic_buf_stride * aligned_height + 4);
1194
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3 if (!c->epic_buf_base)
1195 return AVERROR(ENOMEM);
1196 3 c->epic_buf = c->epic_buf_base + 4;
1197 }
1198 }
1199
1200 4 return 0;
1201 }
1202
1203 14 static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
1204 GetByteContext *gb)
1205 {
1206 int i, j, k;
1207 uint8_t *dst;
1208 uint32_t bits;
1209 uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
1210 uint32_t cursor_hot_x, cursor_hot_y;
1211 int cursor_fmt, err;
1212
1213 14 cur_size = bytestream2_get_be32(gb);
1214 14 cursor_w = bytestream2_get_byte(gb);
1215 14 cursor_h = bytestream2_get_byte(gb);
1216 14 cursor_hot_x = bytestream2_get_byte(gb);
1217 14 cursor_hot_y = bytestream2_get_byte(gb);
1218 14 cursor_fmt = bytestream2_get_byte(gb);
1219
1220
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14 cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
1221
1222
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14 if (cursor_w < 1 || cursor_w > 256 ||
1223
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14 cursor_h < 1 || cursor_h > 256) {
1224 av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
1225 cursor_w, cursor_h);
1226 return AVERROR_INVALIDDATA;
1227 }
1228
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14 if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
1229 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
1230 cursor_hot_x, cursor_hot_y);
1231 cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
1232 cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
1233 }
1234
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14 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
1235
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14 c->cursor_w * c->cursor_h / 4 > cur_size) {
1236 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
1237 cur_size, bytestream2_get_bytes_left(gb));
1238 return AVERROR_INVALIDDATA;
1239 }
1240
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14 if (cursor_fmt != 1 && cursor_fmt != 32) {
1241 avpriv_report_missing_feature(avctx, "Cursor format %d",
1242 cursor_fmt);
1243 return AVERROR_PATCHWELCOME;
1244 }
1245
1246
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14 if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
1247 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
1248 return err;
1249 }
1250
1251 14 c->cursor_w = cursor_w;
1252 14 c->cursor_h = cursor_h;
1253 14 c->cursor_hot_x = cursor_hot_x;
1254 14 c->cursor_hot_y = cursor_hot_y;
1255 14 c->cursor_fmt = cursor_fmt;
1256 14 c->cursor_stride = cursor_stride;
1257
1258 14 dst = c->cursor;
1259
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14 switch (c->cursor_fmt) {
1260 13 case 1: // old monochrome
1261
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429 for (j = 0; j < c->cursor_h; j++) {
1262
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832 for (i = 0; i < c->cursor_w; i += 32) {
1263 416 bits = bytestream2_get_be32(gb);
1264
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13728 for (k = 0; k < 32; k++) {
1265 13312 dst[0] = !!(bits & 0x80000000);
1266 13312 dst += 4;
1267 13312 bits <<= 1;
1268 }
1269 }
1270 }
1271
1272 13 dst = c->cursor;
1273
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429 for (j = 0; j < c->cursor_h; j++) {
1274
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832 for (i = 0; i < c->cursor_w; i += 32) {
1275 416 bits = bytestream2_get_be32(gb);
1276
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13728 for (k = 0; k < 32; k++) {
1277 13312 int mask_bit = !!(bits & 0x80000000);
1278
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13312 switch (dst[0] * 2 + mask_bit) {
1279 824 case 0:
1280 824 dst[0] = 0xFF;
1281 824 dst[1] = 0x00;
1282 824 dst[2] = 0x00;
1283 824 dst[3] = 0x00;
1284 824 break;
1285 920 case 1:
1286 920 dst[0] = 0xFF;
1287 920 dst[1] = 0xFF;
1288 920 dst[2] = 0xFF;
1289 920 dst[3] = 0xFF;
1290 920 break;
1291 11568 default:
1292 11568 dst[0] = 0x00;
1293 11568 dst[1] = 0x00;
1294 11568 dst[2] = 0x00;
1295 11568 dst[3] = 0x00;
1296 }
1297 13312 dst += 4;
1298 13312 bits <<= 1;
1299 }
1300 }
1301 }
1302 13 break;
1303 1 case 32: // full colour
1304 /* skip monochrome version of the cursor and decode RGBA instead */
1305 1 bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
1306
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33 for (j = 0; j < c->cursor_h; j++) {
1307
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1056 for (i = 0; i < c->cursor_w; i++) {
1308 1024 int val = bytestream2_get_be32(gb);
1309 1024 *dst++ = val >> 0;
1310 1024 *dst++ = val >> 8;
1311 1024 *dst++ = val >> 16;
1312 1024 *dst++ = val >> 24;
1313 }
1314 }
1315 1 break;
1316 default:
1317 return AVERROR_PATCHWELCOME;
1318 }
1319 14 return 0;
1320 }
1321
1322 #define APPLY_ALPHA(src, new, alpha) \
1323 src = (src * (256 - alpha) + new * alpha) >> 8
1324
1325 247 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
1326 {
1327 int i, j;
1328 int x, y, w, h;
1329 const uint8_t *cursor;
1330
1331
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247 if (!c->cursor)
1332 return;
1333
1334 247 x = c->cursor_x - c->cursor_hot_x;
1335 247 y = c->cursor_y - c->cursor_hot_y;
1336
1337 247 cursor = c->cursor;
1338 247 w = c->cursor_w;
1339 247 h = c->cursor_h;
1340
1341
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247 if (x + w > c->width)
1342 52 w = c->width - x;
1343
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247 if (y + h > c->height)
1344 h = c->height - y;
1345
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247 if (x < 0) {
1346 w += x;
1347 cursor += -x * 4;
1348 } else {
1349 247 dst += x * 3;
1350 }
1351
1352
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247 if (y < 0)
1353 3 h += y;
1354
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247 if (w < 0 || h < 0)
1355 return;
1356
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247 if (y < 0) {
1357 3 cursor += -y * c->cursor_stride;
1358 } else {
1359 244 dst += y * stride;
1360 }
1361
1362
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8133 for (j = 0; j < h; j++) {
1363
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236974 for (i = 0; i < w; i++) {
1364 229088 uint8_t alpha = cursor[i * 4];
1365 229088 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
1366 229088 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
1367 229088 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
1368 }
1369 7886 dst += stride;
1370 7886 cursor += c->cursor_stride;
1371 }
1372 }
1373
1374 247 static int g2m_decode_frame(AVCodecContext *avctx, void *data,
1375 int *got_picture_ptr, AVPacket *avpkt)
1376 {
1377 247 const uint8_t *buf = avpkt->data;
1378 247 int buf_size = avpkt->size;
1379 247 G2MContext *c = avctx->priv_data;
1380 247 AVFrame *pic = 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 jpg_free_context(&c->jc);
1596 return AVERROR(ENOMEM);
1597 }
1598
1599 6 avctx->pix_fmt = AV_PIX_FMT_RGB24;
1600
1601 // store original sizes and check against those if resize happens
1602 6 c->orig_width = avctx->width;
1603 6 c->orig_height = avctx->height;
1604
1605 6 return 0;
1606 }
1607
1608 6 static av_cold int g2m_decode_end(AVCodecContext *avctx)
1609 {
1610 6 G2MContext *const c = avctx->priv_data;
1611
1612 6 jpg_free_context(&c->jc);
1613
1614 6 av_freep(&c->epic_buf_base);
1615 6 c->epic_buf = NULL;
1616 6 av_freep(&c->kempf_buf);
1617 6 av_freep(&c->kempf_flags);
1618 6 av_freep(&c->synth_tile);
1619 6 av_freep(&c->jpeg_tile);
1620 6 av_freep(&c->cursor);
1621 6 av_freep(&c->framebuf);
1622
1623 6 return 0;
1624 }
1625
1626 const AVCodec ff_g2m_decoder = {
1627 .name = "g2m",
1628 .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
1629 .type = AVMEDIA_TYPE_VIDEO,
1630 .id = AV_CODEC_ID_G2M,
1631 .priv_data_size = sizeof(G2MContext),
1632 .init = g2m_decode_init,
1633 .close = g2m_decode_end,
1634 .decode = g2m_decode_frame,
1635 .capabilities = AV_CODEC_CAP_DR1,
1636 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
1637 };
1638