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;
150 unsigned int framebuf_allocated;
151
152 uint8_t *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base;
153 int tile_stride, epic_buf_stride, old_tile_w, old_tile_h;
154 int swapuv;
155
156 uint8_t *kempf_buf, *kempf_flags;
157
158 uint8_t *cursor;
159 int cursor_stride;
160 int cursor_fmt;
161 int cursor_w, cursor_h, cursor_x, cursor_y;
162 int cursor_hot_x, cursor_hot_y;
163 } G2MContext;
164
jpg_init(AVCodecContext * avctx,JPGContext * c)165 static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
166 {
167 int ret;
168
169 ret = ff_mjpeg_build_vlc(&c->dc_vlc[0], ff_mjpeg_bits_dc_luminance,
170 ff_mjpeg_val_dc, 0, avctx);
171 if (ret)
172 return ret;
173 ret = ff_mjpeg_build_vlc(&c->dc_vlc[1], ff_mjpeg_bits_dc_chrominance,
174 ff_mjpeg_val_dc, 0, avctx);
175 if (ret)
176 return ret;
177 ret = ff_mjpeg_build_vlc(&c->ac_vlc[0], ff_mjpeg_bits_ac_luminance,
178 ff_mjpeg_val_ac_luminance, 1, avctx);
179 if (ret)
180 return ret;
181 ret = ff_mjpeg_build_vlc(&c->ac_vlc[1], ff_mjpeg_bits_ac_chrominance,
182 ff_mjpeg_val_ac_chrominance, 1, avctx);
183 if (ret)
184 return ret;
185
186 ff_blockdsp_init(&c->bdsp, avctx);
187 ff_idctdsp_init(&c->idsp, avctx);
188 ff_init_scantable(c->idsp.idct_permutation, &c->scantable,
189 ff_zigzag_direct);
190
191 return 0;
192 }
193
jpg_free_context(JPGContext * ctx)194 static av_cold void jpg_free_context(JPGContext *ctx)
195 {
196 int i;
197
198 for (i = 0; i < 2; i++) {
199 ff_free_vlc(&ctx->dc_vlc[i]);
200 ff_free_vlc(&ctx->ac_vlc[i]);
201 }
202
203 av_freep(&ctx->buf);
204 }
205
jpg_unescape(const uint8_t * src,int src_size,uint8_t * dst,int * dst_size)206 static void jpg_unescape(const uint8_t *src, int src_size,
207 uint8_t *dst, int *dst_size)
208 {
209 const uint8_t *src_end = src + src_size;
210 uint8_t *dst_start = dst;
211
212 while (src < src_end) {
213 uint8_t x = *src++;
214
215 *dst++ = x;
216
217 if (x == 0xFF && !*src)
218 src++;
219 }
220 *dst_size = dst - dst_start;
221 }
222
jpg_decode_block(JPGContext * c,GetBitContext * gb,int plane,int16_t * block)223 static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
224 int plane, int16_t *block)
225 {
226 int dc, val, pos;
227 const int is_chroma = !!plane;
228 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
229
230 if (get_bits_left(gb) < 1)
231 return AVERROR_INVALIDDATA;
232
233 c->bdsp.clear_block(block);
234 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 2);
235 if (dc < 0)
236 return AVERROR_INVALIDDATA;
237 if (dc)
238 dc = get_xbits(gb, dc);
239 dc = dc * qmat[0] + c->prev_dc[plane];
240 block[0] = dc;
241 c->prev_dc[plane] = dc;
242
243 pos = 0;
244 while (pos < 63) {
245 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 2);
246 if (val < 0)
247 return AVERROR_INVALIDDATA;
248 pos += val >> 4;
249 val &= 0xF;
250 if (pos > 63)
251 return val ? AVERROR_INVALIDDATA : 0;
252 if (val) {
253 int nbits = val;
254
255 val = get_xbits(gb, nbits);
256 val *= qmat[ff_zigzag_direct[pos]];
257 block[c->scantable.permutated[pos]] = val;
258 }
259 }
260 return 0;
261 }
262
yuv2rgb(uint8_t * out,int ridx,int Y,int U,int V)263 static inline void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
264 {
265 out[ridx] = av_clip_uint8(Y + (91881 * V + 32768 >> 16));
266 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
267 out[2 - ridx] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
268 }
269
jpg_decode_data(JPGContext * c,int width,int height,const uint8_t * src,int src_size,uint8_t * dst,int dst_stride,const uint8_t * mask,int mask_stride,int num_mbs,int swapuv)270 static int jpg_decode_data(JPGContext *c, int width, int height,
271 const uint8_t *src, int src_size,
272 uint8_t *dst, int dst_stride,
273 const uint8_t *mask, int mask_stride, int num_mbs,
274 int swapuv)
275 {
276 GetBitContext gb;
277 int mb_w, mb_h, mb_x, mb_y, i, j;
278 int bx, by;
279 int unesc_size;
280 int ret;
281 const int ridx = swapuv ? 2 : 0;
282
283 if ((ret = av_reallocp(&c->buf,
284 src_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0)
285 return ret;
286 jpg_unescape(src, src_size, c->buf, &unesc_size);
287 memset(c->buf + unesc_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
288 if((ret = init_get_bits8(&gb, c->buf, unesc_size)) < 0)
289 return ret;
290
291 width = FFALIGN(width, 16);
292 mb_w = width >> 4;
293 mb_h = (height + 15) >> 4;
294
295 if (!num_mbs)
296 num_mbs = mb_w * mb_h * 4;
297
298 for (i = 0; i < 3; i++)
299 c->prev_dc[i] = 1024;
300 bx =
301 by = 0;
302 c->bdsp.clear_blocks(c->block[0]);
303 for (mb_y = 0; mb_y < mb_h; mb_y++) {
304 for (mb_x = 0; mb_x < mb_w; mb_x++) {
305 if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
306 !mask[mb_x * 2 + mask_stride] &&
307 !mask[mb_x * 2 + 1 + mask_stride]) {
308 bx += 16;
309 continue;
310 }
311 for (j = 0; j < 2; j++) {
312 for (i = 0; i < 2; i++) {
313 if (mask && !mask[mb_x * 2 + i + j * mask_stride])
314 continue;
315 num_mbs--;
316 if ((ret = jpg_decode_block(c, &gb, 0,
317 c->block[i + j * 2])) != 0)
318 return ret;
319 c->idsp.idct(c->block[i + j * 2]);
320 }
321 }
322 for (i = 1; i < 3; i++) {
323 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
324 return ret;
325 c->idsp.idct(c->block[i + 3]);
326 }
327
328 for (j = 0; j < 16; j++) {
329 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
330 for (i = 0; i < 16; i++) {
331 int Y, U, V;
332
333 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
334 U = c->block[4][(i >> 1) + (j >> 1) * 8] - 128;
335 V = c->block[5][(i >> 1) + (j >> 1) * 8] - 128;
336 yuv2rgb(out + i * 3, ridx, Y, U, V);
337 }
338 }
339
340 if (!num_mbs)
341 return 0;
342 bx += 16;
343 }
344 bx = 0;
345 by += 16;
346 if (mask)
347 mask += mask_stride * 2;
348 }
349
350 return 0;
351 }
352
353 #define LOAD_NEIGHBOURS(x) \
354 W = curr_row[(x) - 1]; \
355 N = above_row[(x)]; \
356 WW = curr_row[(x) - 2]; \
357 NW = above_row[(x) - 1]; \
358 NE = above_row[(x) + 1]; \
359 NN = above2_row[(x)]; \
360 NNW = above2_row[(x) - 1]; \
361 NWW = above_row[(x) - 2]; \
362 NNE = above2_row[(x) + 1]
363
364 #define UPDATE_NEIGHBOURS(x) \
365 NNW = NN; \
366 NN = NNE; \
367 NWW = NW; \
368 NW = N; \
369 N = NE; \
370 NE = above_row[(x) + 1]; \
371 NNE = above2_row[(x) + 1]
372
373 #define R_shift 16
374 #define G_shift 8
375 #define B_shift 0
376
377 /* improved djb2 hash from http://www.cse.yorku.ca/~oz/hash.html */
djb2_hash(uint32_t key)378 static int djb2_hash(uint32_t key)
379 {
380 uint32_t h = 5381;
381
382 h = (h * 33) ^ ((key >> 24) & 0xFF); // xxx: probably not needed at all
383 h = (h * 33) ^ ((key >> 16) & 0xFF);
384 h = (h * 33) ^ ((key >> 8) & 0xFF);
385 h = (h * 33) ^ (key & 0xFF);
386
387 return h & (EPIC_HASH_SIZE - 1);
388 }
389
epic_hash_init(ePICPixHash * hash)390 static void epic_hash_init(ePICPixHash *hash)
391 {
392 memset(hash, 0, sizeof(*hash));
393 }
394
epic_hash_find(const ePICPixHash * hash,uint32_t key)395 static ePICPixHashElem *epic_hash_find(const ePICPixHash *hash, uint32_t key)
396 {
397 int i, idx = djb2_hash(key);
398 ePICPixHashElem *bucket = hash->bucket[idx];
399
400 for (i = 0; i < hash->bucket_fill[idx]; i++)
401 if (bucket[i].pix_id == key)
402 return &bucket[i];
403
404 return NULL;
405 }
406
epic_hash_add(ePICPixHash * hash,uint32_t key)407 static ePICPixHashElem *epic_hash_add(ePICPixHash *hash, uint32_t key)
408 {
409 ePICPixHashElem *bucket, *ret;
410 int idx = djb2_hash(key);
411
412 if (hash->bucket_size[idx] > INT_MAX / sizeof(**hash->bucket))
413 return NULL;
414
415 if (!(hash->bucket_fill[idx] < hash->bucket_size[idx])) {
416 int new_size = hash->bucket_size[idx] + 16;
417 bucket = av_realloc(hash->bucket[idx], new_size * sizeof(*bucket));
418 if (!bucket)
419 return NULL;
420 hash->bucket[idx] = bucket;
421 hash->bucket_size[idx] = new_size;
422 }
423
424 ret = &hash->bucket[idx][hash->bucket_fill[idx]++];
425 memset(ret, 0, sizeof(*ret));
426 ret->pix_id = key;
427 return ret;
428 }
429
epic_add_pixel_to_cache(ePICPixHash * hash,uint32_t key,uint32_t pix)430 static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
431 {
432 ePICPixListElem *new_elem;
433 ePICPixHashElem *hash_elem = epic_hash_find(hash, key);
434
435 if (!hash_elem) {
436 if (!(hash_elem = epic_hash_add(hash, key)))
437 return AVERROR(ENOMEM);
438 }
439
440 new_elem = av_mallocz(sizeof(*new_elem));
441 if (!new_elem)
442 return AVERROR(ENOMEM);
443
444 new_elem->pixel = pix;
445 new_elem->next = hash_elem->list;
446 hash_elem->list = new_elem;
447
448 return 0;
449 }
450
epic_cache_entries_for_pixel(const ePICPixHash * hash,uint32_t pix)451 static inline int epic_cache_entries_for_pixel(const ePICPixHash *hash,
452 uint32_t pix)
453 {
454 ePICPixHashElem *hash_elem = epic_hash_find(hash, pix);
455
456 if (hash_elem != NULL && hash_elem->list != NULL)
457 return 1;
458
459 return 0;
460 }
461
epic_free_pixel_cache(ePICPixHash * hash)462 static void epic_free_pixel_cache(ePICPixHash *hash)
463 {
464 int i, j;
465
466 for (i = 0; i < EPIC_HASH_SIZE; i++) {
467 for (j = 0; j < hash->bucket_fill[i]; j++) {
468 ePICPixListElem *list_elem = hash->bucket[i][j].list;
469 while (list_elem) {
470 ePICPixListElem *tmp = list_elem->next;
471 av_free(list_elem);
472 list_elem = tmp;
473 }
474 }
475 av_freep(&hash->bucket[i]);
476 hash->bucket_size[i] =
477 hash->bucket_fill[i] = 0;
478 }
479 }
480
is_pixel_on_stack(const ePICContext * dc,uint32_t pix)481 static inline int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
482 {
483 int i;
484
485 for (i = 0; i < dc->stack_pos; i++)
486 if (dc->stack[i] == pix)
487 break;
488
489 return i != dc->stack_pos;
490 }
491
492 #define TOSIGNED(val) (((val) >> 1) ^ -((val) & 1))
493
epic_decode_component_pred(ePICContext * dc,int N,int W,int NW)494 static inline int epic_decode_component_pred(ePICContext *dc,
495 int N, int W, int NW)
496 {
497 unsigned delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
498 return mid_pred(N, N + W - NW, W) - TOSIGNED(delta);
499 }
500
epic_decode_pixel_pred(ePICContext * dc,int x,int y,const uint32_t * curr_row,const uint32_t * above_row)501 static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y,
502 const uint32_t *curr_row,
503 const uint32_t *above_row)
504 {
505 uint32_t N, W, NW, pred;
506 unsigned delta;
507 int GN, GW, GNW, R, G, B;
508
509 if (x && y) {
510 W = curr_row[x - 1];
511 N = above_row[x];
512 NW = above_row[x - 1];
513
514 GN = (N >> G_shift) & 0xFF;
515 GW = (W >> G_shift) & 0xFF;
516 GNW = (NW >> G_shift) & 0xFF;
517
518 G = epic_decode_component_pred(dc, GN, GW, GNW);
519
520 R = G + epic_decode_component_pred(dc,
521 ((N >> R_shift) & 0xFF) - GN,
522 ((W >> R_shift) & 0xFF) - GW,
523 ((NW >> R_shift) & 0xFF) - GNW);
524
525 B = G + epic_decode_component_pred(dc,
526 ((N >> B_shift) & 0xFF) - GN,
527 ((W >> B_shift) & 0xFF) - GW,
528 ((NW >> B_shift) & 0xFF) - GNW);
529 } else {
530 if (x)
531 pred = curr_row[x - 1];
532 else
533 pred = above_row[x];
534
535 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
536 R = ((pred >> R_shift) & 0xFF) - TOSIGNED(delta);
537
538 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
539 G = ((pred >> G_shift) & 0xFF) - TOSIGNED(delta);
540
541 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
542 B = ((pred >> B_shift) & 0xFF) - TOSIGNED(delta);
543 }
544
545 if (R<0 || G<0 || B<0 || R > 255 || G > 255 || B > 255) {
546 avpriv_request_sample(NULL, "RGB %d %d %d (out of range)", R, G, B);
547 return 0;
548 }
549
550 return (R << R_shift) | (G << G_shift) | (B << B_shift);
551 }
552
epic_predict_pixel(ePICContext * dc,uint8_t * rung,uint32_t * pPix,uint32_t pix)553 static int epic_predict_pixel(ePICContext *dc, uint8_t *rung,
554 uint32_t *pPix, uint32_t pix)
555 {
556 if (!ff_els_decode_bit(&dc->els_ctx, rung)) {
557 *pPix = pix;
558 return 1;
559 }
560 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
561 return 0;
562 }
563
epic_handle_edges(ePICContext * dc,int x,int y,const uint32_t * curr_row,const uint32_t * above_row,uint32_t * pPix)564 static int epic_handle_edges(ePICContext *dc, int x, int y,
565 const uint32_t *curr_row,
566 const uint32_t *above_row, uint32_t *pPix)
567 {
568 uint32_t pix;
569
570 if (!x && !y) { /* special case: top-left pixel */
571 /* the top-left pixel is coded independently with 3 unsigned numbers */
572 *pPix = (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << R_shift) |
573 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << G_shift) |
574 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << B_shift);
575 return 1;
576 }
577
578 if (x) { /* predict from W first */
579 pix = curr_row[x - 1];
580 if (epic_predict_pixel(dc, &dc->W_flag_rung, pPix, pix))
581 return 1;
582 }
583
584 if (y) { /* then try to predict from N */
585 pix = above_row[x];
586 if (!dc->stack_pos || dc->stack[0] != pix) {
587 if (epic_predict_pixel(dc, &dc->N_flag_rung, pPix, pix))
588 return 1;
589 }
590 }
591
592 return 0;
593 }
594
epic_decode_run_length(ePICContext * dc,int x,int y,int tile_width,const uint32_t * curr_row,const uint32_t * above_row,const uint32_t * above2_row,uint32_t * pPix,int * pRun)595 static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width,
596 const uint32_t *curr_row,
597 const uint32_t *above_row,
598 const uint32_t *above2_row,
599 uint32_t *pPix, int *pRun)
600 {
601 int idx, got_pixel = 0, WWneW, old_WWneW = 0;
602 uint32_t W, WW, N, NN, NW, NE, NWW, NNW, NNE;
603
604 *pRun = 0;
605
606 LOAD_NEIGHBOURS(x);
607
608 if (dc->next_run_pos == x) {
609 /* can't reuse W for the new pixel in this case */
610 WWneW = 1;
611 } else {
612 idx = (WW != W) << 7 |
613 (NW != W) << 6 |
614 (N != NE) << 5 |
615 (NW != N) << 4 |
616 (NWW != NW) << 3 |
617 (NNE != NE) << 2 |
618 (NN != N) << 1 |
619 (NNW != NW);
620 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
621 if (WWneW < 0)
622 return WWneW;
623 }
624
625 if (WWneW)
626 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = W;
627 else {
628 *pPix = W;
629 got_pixel = 1;
630 }
631
632 do {
633 int NWneW = 1;
634 if (got_pixel) // pixel value already known (derived from either W or N)
635 NWneW = *pPix != N;
636 else { // pixel value is unknown and will be decoded later
637 NWneW = *pRun ? NWneW : NW != W;
638
639 /* TODO: RFC this mess! */
640 switch (((NW != N) << 2) | (NWneW << 1) | WWneW) {
641 case 0:
642 break; // do nothing here
643 case 3:
644 case 5:
645 case 6:
646 case 7:
647 if (!is_pixel_on_stack(dc, N)) {
648 idx = WWneW << 8 |
649 (*pRun ? old_WWneW : WW != W) << 7 |
650 NWneW << 6 |
651 (N != NE) << 5 |
652 (NW != N) << 4 |
653 (NWW != NW) << 3 |
654 (NNE != NE) << 2 |
655 (NN != N) << 1 |
656 (NNW != NW);
657 if (!ff_els_decode_bit(&dc->els_ctx, &dc->N_ctx_rung[idx])) {
658 NWneW = 0;
659 *pPix = N;
660 got_pixel = 1;
661 break;
662 }
663 }
664 /* fall through */
665 default:
666 NWneW = 1;
667 old_WWneW = WWneW;
668 if (!is_pixel_on_stack(dc, N))
669 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = N;
670 }
671 }
672
673 (*pRun)++;
674 if (x + *pRun >= tile_width - 1)
675 break;
676
677 UPDATE_NEIGHBOURS(x + *pRun);
678
679 if (!NWneW && NW == N && N == NE) {
680 int pos, run, rle;
681 int start_pos = x + *pRun;
682
683 /* scan for a run of pix in the line above */
684 uint32_t pix = above_row[start_pos + 1];
685 for (pos = start_pos + 2; pos < tile_width; pos++)
686 if (!(above_row[pos] == pix))
687 break;
688 run = pos - start_pos - 1;
689 idx = av_ceil_log2(run);
690 if (ff_els_decode_bit(&dc->els_ctx, &dc->prev_row_rung[idx]))
691 *pRun += run;
692 else {
693 int flag;
694 /* run-length is coded as plain binary number of idx - 1 bits */
695 for (pos = idx - 1, rle = 0, flag = 0; pos >= 0; pos--) {
696 if ((1 << pos) + rle < run &&
697 ff_els_decode_bit(&dc->els_ctx,
698 flag ? &dc->runlen_one
699 : &dc->runlen_zeroes[pos])) {
700 flag = 1;
701 rle |= 1 << pos;
702 }
703 }
704 *pRun += rle;
705 break; // return immediately
706 }
707 if (x + *pRun >= tile_width - 1)
708 break;
709
710 LOAD_NEIGHBOURS(x + *pRun);
711 WWneW = 0;
712 NWneW = 0;
713 }
714
715 idx = WWneW << 7 |
716 NWneW << 6 |
717 (N != NE) << 5 |
718 (NW != N) << 4 |
719 (NWW != NW) << 3 |
720 (NNE != NE) << 2 |
721 (NN != N) << 1 |
722 (NNW != NW);
723 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
724 } while (!WWneW);
725
726 dc->next_run_pos = x + *pRun;
727 return got_pixel;
728 }
729
epic_predict_pixel2(ePICContext * dc,uint8_t * rung,uint32_t * pPix,uint32_t pix)730 static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung,
731 uint32_t *pPix, uint32_t pix)
732 {
733 if (ff_els_decode_bit(&dc->els_ctx, rung)) {
734 *pPix = pix;
735 return 1;
736 }
737 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
738 return 0;
739 }
740
epic_predict_from_NW_NE(ePICContext * dc,int x,int y,int run,int tile_width,const uint32_t * curr_row,const uint32_t * above_row,uint32_t * pPix)741 static int epic_predict_from_NW_NE(ePICContext *dc, int x, int y, int run,
742 int tile_width, const uint32_t *curr_row,
743 const uint32_t *above_row, uint32_t *pPix)
744 {
745 int pos;
746
747 /* try to reuse the NW pixel first */
748 if (x && y) {
749 uint32_t NW = above_row[x - 1];
750 if (NW != curr_row[x - 1] && NW != above_row[x] && !is_pixel_on_stack(dc, NW)) {
751 if (epic_predict_pixel2(dc, &dc->nw_pred_rung[NW & 0xFF], pPix, NW))
752 return 1;
753 }
754 }
755
756 /* try to reuse the NE[x + run, y] pixel */
757 pos = x + run - 1;
758 if (pos < tile_width - 1 && y) {
759 uint32_t NE = above_row[pos + 1];
760 if (NE != above_row[pos] && !is_pixel_on_stack(dc, NE)) {
761 if (epic_predict_pixel2(dc, &dc->ne_pred_rung[NE & 0xFF], pPix, NE))
762 return 1;
763 }
764 }
765
766 return 0;
767 }
768
epic_decode_from_cache(ePICContext * dc,uint32_t W,uint32_t * pPix)769 static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix)
770 {
771 ePICPixListElem *list, *prev = NULL;
772 ePICPixHashElem *hash_elem = epic_hash_find(&dc->hash, W);
773
774 if (!hash_elem || !hash_elem->list)
775 return 0;
776
777 list = hash_elem->list;
778 while (list) {
779 if (!is_pixel_on_stack(dc, list->pixel)) {
780 if (ff_els_decode_bit(&dc->els_ctx, &list->rung)) {
781 *pPix = list->pixel;
782 if (list != hash_elem->list) {
783 prev->next = list->next;
784 list->next = hash_elem->list;
785 hash_elem->list = list;
786 }
787 return 1;
788 }
789 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = list->pixel;
790 }
791 prev = list;
792 list = list->next;
793 }
794
795 return 0;
796 }
797
epic_decode_tile(ePICContext * dc,uint8_t * out,int tile_height,int tile_width,int stride)798 static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height,
799 int tile_width, int stride)
800 {
801 int x, y;
802 uint32_t pix;
803 uint32_t *curr_row = NULL, *above_row = NULL, *above2_row;
804
805 for (y = 0; y < tile_height; y++, out += stride) {
806 above2_row = above_row;
807 above_row = curr_row;
808 curr_row = (uint32_t *) out;
809
810 for (x = 0, dc->next_run_pos = 0; x < tile_width;) {
811 if (dc->els_ctx.err)
812 return AVERROR_INVALIDDATA; // bail out in the case of ELS overflow
813
814 pix = curr_row[x - 1]; // get W pixel
815
816 if (y >= 1 && x >= 2 &&
817 pix != curr_row[x - 2] && pix != above_row[x - 1] &&
818 pix != above_row[x - 2] && pix != above_row[x] &&
819 !epic_cache_entries_for_pixel(&dc->hash, pix)) {
820 curr_row[x] = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
821 x++;
822 } else {
823 int got_pixel, run;
824 dc->stack_pos = 0; // empty stack
825
826 if (y < 2 || x < 2 || x == tile_width - 1) {
827 run = 1;
828 got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix);
829 } else {
830 got_pixel = epic_decode_run_length(dc, x, y, tile_width,
831 curr_row, above_row,
832 above2_row, &pix, &run);
833 if (got_pixel < 0)
834 return got_pixel;
835 }
836
837 if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run,
838 tile_width, curr_row,
839 above_row, &pix)) {
840 uint32_t ref_pix = curr_row[x - 1];
841 if (!x || !epic_decode_from_cache(dc, ref_pix, &pix)) {
842 pix = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
843 if (is_pixel_on_stack(dc, pix))
844 return AVERROR_INVALIDDATA;
845
846 if (x) {
847 int ret = epic_add_pixel_to_cache(&dc->hash,
848 ref_pix,
849 pix);
850 if (ret)
851 return ret;
852 }
853 }
854 }
855 for (; run > 0; x++, run--)
856 curr_row[x] = pix;
857 }
858 }
859 }
860
861 return 0;
862 }
863
epic_jb_decode_tile(G2MContext * c,int tile_x,int tile_y,const uint8_t * src,size_t src_size,AVCodecContext * avctx)864 static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y,
865 const uint8_t *src, size_t src_size,
866 AVCodecContext *avctx)
867 {
868 uint8_t prefix, mask = 0x80;
869 int extrabytes, tile_width, tile_height, awidth, aheight;
870 size_t els_dsize;
871 uint8_t *dst;
872
873 if (!src_size)
874 return 0;
875
876 /* get data size of the ELS partition as unsigned variable-length integer */
877 prefix = *src++;
878 src_size--;
879 for (extrabytes = 0; (prefix & mask) && (extrabytes < 7); extrabytes++)
880 mask >>= 1;
881 if (extrabytes > 3 || src_size < extrabytes) {
882 av_log(avctx, AV_LOG_ERROR, "ePIC: invalid data size VLI\n");
883 return AVERROR_INVALIDDATA;
884 }
885
886 els_dsize = prefix & ((0x80 >> extrabytes) - 1); // mask out the length prefix
887 while (extrabytes-- > 0) {
888 els_dsize = (els_dsize << 8) | *src++;
889 src_size--;
890 }
891
892 if (src_size < els_dsize) {
893 av_log(avctx, AV_LOG_ERROR, "ePIC: data too short, needed %"SIZE_SPECIFIER", got %"SIZE_SPECIFIER"\n",
894 els_dsize, src_size);
895 return AVERROR_INVALIDDATA;
896 }
897
898 tile_width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
899 tile_height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
900 awidth = FFALIGN(tile_width, 16);
901 aheight = FFALIGN(tile_height, 16);
902
903 if (tile_width > (1 << FF_ARRAY_ELEMS(c->ec.prev_row_rung))) {
904 avpriv_request_sample(avctx, "large tile width");
905 return AVERROR_INVALIDDATA;
906 }
907
908 if (els_dsize) {
909 int ret, i, j, k;
910 uint8_t tr_r, tr_g, tr_b, *buf;
911 uint32_t *in;
912 /* ELS decoder initializations */
913 memset(&c->ec, 0, sizeof(c->ec));
914 ff_els_decoder_init(&c->ec.els_ctx, src, els_dsize);
915 epic_hash_init(&c->ec.hash);
916
917 /* decode transparent pixel value */
918 tr_r = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
919 tr_g = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
920 tr_b = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
921 if (c->ec.els_ctx.err != 0) {
922 av_log(avctx, AV_LOG_ERROR,
923 "ePIC: couldn't decode transparency pixel!\n");
924 ff_els_decoder_uninit(&c->ec.unsigned_rung);
925 return AVERROR_INVALIDDATA;
926 }
927
928 ret = epic_decode_tile(&c->ec, c->epic_buf, tile_height, tile_width,
929 c->epic_buf_stride);
930
931 epic_free_pixel_cache(&c->ec.hash);
932 ff_els_decoder_uninit(&c->ec.unsigned_rung);
933
934 if (ret) {
935 av_log(avctx, AV_LOG_ERROR,
936 "ePIC: tile decoding failed, frame=%d, tile_x=%d, tile_y=%d\n",
937 avctx->frame_number, tile_x, tile_y);
938 return AVERROR_INVALIDDATA;
939 }
940
941 buf = c->epic_buf;
942 dst = c->framebuf + tile_x * c->tile_width * 3 +
943 tile_y * c->tile_height * c->framebuf_stride;
944
945 for (j = 0; j < tile_height; j++) {
946 uint8_t *out = dst;
947 in = (uint32_t *) buf;
948 for (i = 0; i < tile_width; i++) {
949 out[0] = (in[i] >> R_shift) & 0xFF;
950 out[1] = (in[i] >> G_shift) & 0xFF;
951 out[2] = (in[i] >> B_shift) & 0xFF;
952 out += 3;
953 }
954 buf += c->epic_buf_stride;
955 dst += c->framebuf_stride;
956 }
957
958 if (src_size > els_dsize) {
959 uint8_t *jpg;
960 uint32_t tr;
961 int bstride = FFALIGN(tile_width, 16) >> 3;
962 int nblocks = 0;
963 int estride = c->epic_buf_stride >> 2;
964
965 src += els_dsize;
966 src_size -= els_dsize;
967
968 in = (uint32_t *) c->epic_buf;
969 tr = (tr_r << R_shift) | (tr_g << G_shift) | (tr_b << B_shift);
970
971 memset(c->kempf_flags, 0,
972 (aheight >> 3) * bstride * sizeof(*c->kempf_flags));
973 for (j = 0; j < tile_height; j += 8) {
974 for (i = 0; i < tile_width; i += 8) {
975 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 0;
976 for (k = 0; k < 8 * 8; k++) {
977 if (in[i + (k & 7) + (k >> 3) * estride] == tr) {
978 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 1;
979 nblocks++;
980 break;
981 }
982 }
983 }
984 in += 8 * estride;
985 }
986
987 memset(c->jpeg_tile, 0, c->tile_stride * aheight);
988 jpg_decode_data(&c->jc, awidth, aheight, src, src_size,
989 c->jpeg_tile, c->tile_stride,
990 c->kempf_flags, bstride, nblocks, c->swapuv);
991
992 in = (uint32_t *) c->epic_buf;
993 dst = c->framebuf + tile_x * c->tile_width * 3 +
994 tile_y * c->tile_height * c->framebuf_stride;
995 jpg = c->jpeg_tile;
996 for (j = 0; j < tile_height; j++) {
997 for (i = 0; i < tile_width; i++)
998 if (in[i] == tr)
999 memcpy(dst + i * 3, jpg + i * 3, 3);
1000 in += c->epic_buf_stride >> 2;
1001 dst += c->framebuf_stride;
1002 jpg += c->tile_stride;
1003 }
1004 }
1005 } else {
1006 dst = c->framebuf + tile_x * c->tile_width * 3 +
1007 tile_y * c->tile_height * c->framebuf_stride;
1008 return jpg_decode_data(&c->jc, tile_width, tile_height, src, src_size,
1009 dst, c->framebuf_stride, NULL, 0, 0, c->swapuv);
1010 }
1011
1012 return 0;
1013 }
1014
kempf_restore_buf(const uint8_t * src,int len,uint8_t * dst,int stride,const uint8_t * jpeg_tile,int tile_stride,int width,int height,const uint8_t * pal,int npal,int tidx)1015 static int kempf_restore_buf(const uint8_t *src, int len,
1016 uint8_t *dst, int stride,
1017 const uint8_t *jpeg_tile, int tile_stride,
1018 int width, int height,
1019 const uint8_t *pal, int npal, int tidx)
1020 {
1021 GetBitContext gb;
1022 int i, j, nb, col;
1023 int ret;
1024 int align_width = FFALIGN(width, 16);
1025
1026 if ((ret = init_get_bits8(&gb, src, len)) < 0)
1027 return ret;
1028
1029 if (npal <= 2) nb = 1;
1030 else if (npal <= 4) nb = 2;
1031 else if (npal <= 16) nb = 4;
1032 else nb = 8;
1033
1034 for (j = 0; j < height; j++, dst += stride, jpeg_tile = FF_PTR_ADD(jpeg_tile, tile_stride)) {
1035 if (get_bits(&gb, 8))
1036 continue;
1037 for (i = 0; i < width; i++) {
1038 col = get_bits(&gb, nb);
1039 if (col != tidx)
1040 memcpy(dst + i * 3, pal + col * 3, 3);
1041 else
1042 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
1043 }
1044 skip_bits_long(&gb, nb * (align_width - width));
1045 }
1046
1047 return 0;
1048 }
1049
kempf_decode_tile(G2MContext * c,int tile_x,int tile_y,const uint8_t * src,int src_size)1050 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
1051 const uint8_t *src, int src_size)
1052 {
1053 int width, height;
1054 int hdr, zsize, npal, tidx = -1, ret;
1055 int i, j;
1056 const uint8_t *src_end = src + src_size;
1057 uint8_t pal[768], transp[3];
1058 uLongf dlen = (c->tile_width + 1) * c->tile_height;
1059 int sub_type;
1060 int nblocks, cblocks, bstride;
1061 int bits, bitbuf, coded;
1062 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
1063 tile_y * c->tile_height * c->framebuf_stride;
1064
1065 if (src_size < 2)
1066 return AVERROR_INVALIDDATA;
1067
1068 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
1069 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
1070
1071 hdr = *src++;
1072 sub_type = hdr >> 5;
1073 if (sub_type == 0) {
1074 int j;
1075 memcpy(transp, src, 3);
1076 src += 3;
1077 for (j = 0; j < height; j++, dst += c->framebuf_stride)
1078 for (i = 0; i < width; i++)
1079 memcpy(dst + i * 3, transp, 3);
1080 return 0;
1081 } else if (sub_type == 1) {
1082 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
1083 dst, c->framebuf_stride, NULL, 0, 0, 0);
1084 }
1085
1086 if (sub_type != 2) {
1087 memcpy(transp, src, 3);
1088 src += 3;
1089 }
1090 npal = *src++ + 1;
1091 if (src_end - src < npal * 3)
1092 return AVERROR_INVALIDDATA;
1093 memcpy(pal, src, npal * 3);
1094 src += npal * 3;
1095 if (sub_type != 2) {
1096 for (i = 0; i < npal; i++) {
1097 if (!memcmp(pal + i * 3, transp, 3)) {
1098 tidx = i;
1099 break;
1100 }
1101 }
1102 }
1103
1104 if (src_end - src < 2)
1105 return 0;
1106 zsize = (src[0] << 8) | src[1];
1107 src += 2;
1108
1109 if (src_end - src < zsize + (sub_type != 2))
1110 return AVERROR_INVALIDDATA;
1111
1112 ret = uncompress(c->kempf_buf, &dlen, src, zsize);
1113 if (ret)
1114 return AVERROR_INVALIDDATA;
1115 src += zsize;
1116
1117 if (sub_type == 2) {
1118 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1119 NULL, 0, width, height, pal, npal, tidx);
1120 return 0;
1121 }
1122
1123 nblocks = *src++ + 1;
1124 cblocks = 0;
1125 bstride = FFALIGN(width, 16) >> 3;
1126 // blocks are coded LSB and we need normal bitreader for JPEG data
1127 bits = 0;
1128 for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
1129 for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
1130 if (!bits) {
1131 if (src >= src_end)
1132 return AVERROR_INVALIDDATA;
1133 bitbuf = *src++;
1134 bits = 8;
1135 }
1136 coded = bitbuf & 1;
1137 bits--;
1138 bitbuf >>= 1;
1139 cblocks += coded;
1140 if (cblocks > nblocks)
1141 return AVERROR_INVALIDDATA;
1142 c->kempf_flags[j * 2 + i * 2 * bstride] =
1143 c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
1144 c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
1145 c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
1146 }
1147 }
1148
1149 memset(c->jpeg_tile, 0, c->tile_stride * height);
1150 jpg_decode_data(&c->jc, width, height, src, src_end - src,
1151 c->jpeg_tile, c->tile_stride,
1152 c->kempf_flags, bstride, nblocks * 4, 0);
1153
1154 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1155 c->jpeg_tile, c->tile_stride,
1156 width, height, pal, npal, tidx);
1157
1158 return 0;
1159 }
1160
g2m_init_buffers(G2MContext * c)1161 static int g2m_init_buffers(G2MContext *c)
1162 {
1163 int aligned_height;
1164
1165 c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
1166 aligned_height = c->height + 15;
1167
1168 av_fast_mallocz(&c->framebuf, &c->framebuf_allocated, c->framebuf_stride * aligned_height);
1169 if (!c->framebuf)
1170 return AVERROR(ENOMEM);
1171
1172 if (!c->synth_tile || !c->jpeg_tile ||
1173 (c->compression == 2 && !c->epic_buf_base) ||
1174 c->old_tile_w < c->tile_width ||
1175 c->old_tile_h < c->tile_height) {
1176 c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
1177 c->epic_buf_stride = FFALIGN(c->tile_width * 4, 16);
1178 aligned_height = FFALIGN(c->tile_height, 16);
1179 av_freep(&c->synth_tile);
1180 av_freep(&c->jpeg_tile);
1181 av_freep(&c->kempf_buf);
1182 av_freep(&c->kempf_flags);
1183 av_freep(&c->epic_buf_base);
1184 c->epic_buf = NULL;
1185 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
1186 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
1187 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height +
1188 AV_INPUT_BUFFER_PADDING_SIZE);
1189 c->kempf_flags = av_mallocz(c->tile_width * aligned_height);
1190 if (!c->synth_tile || !c->jpeg_tile ||
1191 !c->kempf_buf || !c->kempf_flags)
1192 return AVERROR(ENOMEM);
1193 if (c->compression == 2) {
1194 c->epic_buf_base = av_mallocz(c->epic_buf_stride * aligned_height + 4);
1195 if (!c->epic_buf_base)
1196 return AVERROR(ENOMEM);
1197 c->epic_buf = c->epic_buf_base + 4;
1198 }
1199 }
1200
1201 return 0;
1202 }
1203
g2m_load_cursor(AVCodecContext * avctx,G2MContext * c,GetByteContext * gb)1204 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 cur_size = bytestream2_get_be32(gb);
1215 cursor_w = bytestream2_get_byte(gb);
1216 cursor_h = bytestream2_get_byte(gb);
1217 cursor_hot_x = bytestream2_get_byte(gb);
1218 cursor_hot_y = bytestream2_get_byte(gb);
1219 cursor_fmt = bytestream2_get_byte(gb);
1220
1221 cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
1222
1223 if (cursor_w < 1 || cursor_w > 256 ||
1224 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 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 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
1236 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 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 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 c->cursor_w = cursor_w;
1253 c->cursor_h = cursor_h;
1254 c->cursor_hot_x = cursor_hot_x;
1255 c->cursor_hot_y = cursor_hot_y;
1256 c->cursor_fmt = cursor_fmt;
1257 c->cursor_stride = cursor_stride;
1258
1259 dst = c->cursor;
1260 switch (c->cursor_fmt) {
1261 case 1: // old monochrome
1262 for (j = 0; j < c->cursor_h; j++) {
1263 for (i = 0; i < c->cursor_w; i += 32) {
1264 bits = bytestream2_get_be32(gb);
1265 for (k = 0; k < 32; k++) {
1266 dst[0] = !!(bits & 0x80000000);
1267 dst += 4;
1268 bits <<= 1;
1269 }
1270 }
1271 }
1272
1273 dst = c->cursor;
1274 for (j = 0; j < c->cursor_h; j++) {
1275 for (i = 0; i < c->cursor_w; i += 32) {
1276 bits = bytestream2_get_be32(gb);
1277 for (k = 0; k < 32; k++) {
1278 int mask_bit = !!(bits & 0x80000000);
1279 switch (dst[0] * 2 + mask_bit) {
1280 case 0:
1281 dst[0] = 0xFF;
1282 dst[1] = 0x00;
1283 dst[2] = 0x00;
1284 dst[3] = 0x00;
1285 break;
1286 case 1:
1287 dst[0] = 0xFF;
1288 dst[1] = 0xFF;
1289 dst[2] = 0xFF;
1290 dst[3] = 0xFF;
1291 break;
1292 default:
1293 dst[0] = 0x00;
1294 dst[1] = 0x00;
1295 dst[2] = 0x00;
1296 dst[3] = 0x00;
1297 }
1298 dst += 4;
1299 bits <<= 1;
1300 }
1301 }
1302 }
1303 break;
1304 case 32: // full colour
1305 /* skip monochrome version of the cursor and decode RGBA instead */
1306 bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
1307 for (j = 0; j < c->cursor_h; j++) {
1308 for (i = 0; i < c->cursor_w; i++) {
1309 int val = bytestream2_get_be32(gb);
1310 *dst++ = val >> 0;
1311 *dst++ = val >> 8;
1312 *dst++ = val >> 16;
1313 *dst++ = val >> 24;
1314 }
1315 }
1316 break;
1317 default:
1318 return AVERROR_PATCHWELCOME;
1319 }
1320 return 0;
1321 }
1322
1323 #define APPLY_ALPHA(src, new, alpha) \
1324 src = (src * (256 - alpha) + new * alpha) >> 8
1325
g2m_paint_cursor(G2MContext * c,uint8_t * dst,int stride)1326 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 if (!c->cursor)
1333 return;
1334
1335 x = c->cursor_x - c->cursor_hot_x;
1336 y = c->cursor_y - c->cursor_hot_y;
1337
1338 cursor = c->cursor;
1339 w = c->cursor_w;
1340 h = c->cursor_h;
1341
1342 if (x + w > c->width)
1343 w = c->width - x;
1344 if (y + h > c->height)
1345 h = c->height - y;
1346 if (x < 0) {
1347 w += x;
1348 cursor += -x * 4;
1349 } else {
1350 dst += x * 3;
1351 }
1352
1353 if (y < 0)
1354 h += y;
1355 if (w < 0 || h < 0)
1356 return;
1357 if (y < 0) {
1358 cursor += -y * c->cursor_stride;
1359 } else {
1360 dst += y * stride;
1361 }
1362
1363 for (j = 0; j < h; j++) {
1364 for (i = 0; i < w; i++) {
1365 uint8_t alpha = cursor[i * 4];
1366 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
1367 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
1368 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
1369 }
1370 dst += stride;
1371 cursor += c->cursor_stride;
1372 }
1373 }
1374
g2m_decode_frame(AVCodecContext * avctx,AVFrame * pic,int * got_picture_ptr,AVPacket * avpkt)1375 static int g2m_decode_frame(AVCodecContext *avctx, AVFrame *pic,
1376 int *got_picture_ptr, AVPacket *avpkt)
1377 {
1378 const uint8_t *buf = avpkt->data;
1379 int buf_size = avpkt->size;
1380 G2MContext *c = avctx->priv_data;
1381 GetByteContext bc, tbc;
1382 int magic;
1383 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 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 bytestream2_init(&bc, buf, buf_size);
1397
1398 magic = bytestream2_get_be32(&bc);
1399 if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
1400 (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 c->swapuv = magic == MKBETAG('G', '2', 'M', '2');
1406
1407 while (bytestream2_get_bytes_left(&bc) > 5) {
1408 chunk_size = bytestream2_get_le32(&bc) - 1;
1409 chunk_type = bytestream2_get_byte(&bc);
1410 chunk_start = bytestream2_tell(&bc);
1411 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 switch (chunk_type) {
1417 case DISPLAY_INFO:
1418 got_header =
1419 c->got_header = 0;
1420 if (chunk_size < 21) {
1421 av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
1422 chunk_size);
1423 break;
1424 }
1425 c->width = bytestream2_get_be32(&bc);
1426 c->height = bytestream2_get_be32(&bc);
1427 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 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 c->compression = bytestream2_get_be32(&bc);
1440 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 c->tile_width = bytestream2_get_be32(&bc);
1447 c->tile_height = bytestream2_get_be32(&bc);
1448 if (c->tile_width <= 0 || c->tile_height <= 0 ||
1449 ((c->tile_width | c->tile_height) & 0xF) ||
1450 c->tile_width * (uint64_t)c->tile_height >= INT_MAX / 4 ||
1451 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 c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
1460 c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
1461 c->bpp = bytestream2_get_byte(&bc);
1462 if (c->bpp == 32) {
1463 if (bytestream2_get_bytes_left(&bc) < 16 ||
1464 (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 r_mask = bytestream2_get_be32(&bc);
1471 g_mask = bytestream2_get_be32(&bc);
1472 b_mask = bytestream2_get_be32(&bc);
1473 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 if (g2m_init_buffers(c)) {
1486 ret = AVERROR(ENOMEM);
1487 goto header_fail;
1488 }
1489 got_header = 1;
1490 break;
1491 case TILE_DATA:
1492 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 if (chunk_size < 2) {
1498 av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
1499 chunk_size);
1500 break;
1501 }
1502 c->tile_x = bytestream2_get_byte(&bc);
1503 c->tile_y = bytestream2_get_byte(&bc);
1504 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 ret = 0;
1511 switch (c->compression) {
1512 case COMPR_EPIC_J_B:
1513 ret = epic_jb_decode_tile(c, c->tile_x, c->tile_y,
1514 buf + bytestream2_tell(&bc),
1515 chunk_size - 2, avctx);
1516 break;
1517 case COMPR_KEMPF_J_B:
1518 ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
1519 buf + bytestream2_tell(&bc),
1520 chunk_size - 2);
1521 break;
1522 }
1523 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 break;
1527 case CURSOR_POS:
1528 if (chunk_size < 5) {
1529 av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
1530 chunk_size);
1531 break;
1532 }
1533 c->cursor_x = bytestream2_get_be16(&bc);
1534 c->cursor_y = bytestream2_get_be16(&bc);
1535 break;
1536 case CURSOR_SHAPE:
1537 if (chunk_size < 8) {
1538 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
1539 chunk_size);
1540 break;
1541 }
1542 bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
1543 chunk_size - 4);
1544 g2m_load_cursor(avctx, c, &tbc);
1545 break;
1546 case CHUNK_CC:
1547 case CHUNK_CD:
1548 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 bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
1556 }
1557 if (got_header)
1558 c->got_header = 1;
1559
1560 if (c->width && c->height && c->framebuf) {
1561 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
1562 return ret;
1563
1564 pic->key_frame = got_header;
1565 pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
1566
1567 for (i = 0; i < avctx->height; i++)
1568 memcpy(pic->data[0] + i * pic->linesize[0],
1569 c->framebuf + i * c->framebuf_stride,
1570 c->width * 3);
1571 g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
1572
1573 *got_picture_ptr = 1;
1574 }
1575
1576 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
g2m_decode_init(AVCodecContext * avctx)1588 static av_cold int g2m_decode_init(AVCodecContext *avctx)
1589 {
1590 G2MContext *const c = avctx->priv_data;
1591 int ret;
1592
1593 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 avctx->pix_fmt = AV_PIX_FMT_RGB24;
1599
1600 // store original sizes and check against those if resize happens
1601 c->orig_width = avctx->width;
1602 c->orig_height = avctx->height;
1603
1604 return 0;
1605 }
1606
g2m_decode_end(AVCodecContext * avctx)1607 static av_cold int g2m_decode_end(AVCodecContext *avctx)
1608 {
1609 G2MContext *const c = avctx->priv_data;
1610
1611 jpg_free_context(&c->jc);
1612
1613 av_freep(&c->epic_buf_base);
1614 c->epic_buf = NULL;
1615 av_freep(&c->kempf_buf);
1616 av_freep(&c->kempf_flags);
1617 av_freep(&c->synth_tile);
1618 av_freep(&c->jpeg_tile);
1619 av_freep(&c->cursor);
1620 av_freep(&c->framebuf);
1621 c->framebuf_allocated = 0;
1622
1623 return 0;
1624 }
1625
1626 const FFCodec ff_g2m_decoder = {
1627 .p.name = "g2m",
1628 .p.long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
1629 .p.type = AVMEDIA_TYPE_VIDEO,
1630 .p.id = AV_CODEC_ID_G2M,
1631 .priv_data_size = sizeof(G2MContext),
1632 .init = g2m_decode_init,
1633 .close = g2m_decode_end,
1634 FF_CODEC_DECODE_CB(g2m_decode_frame),
1635 .p.capabilities = AV_CODEC_CAP_DR1,
1636 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
1637 };
1638