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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/intreadwrite.h"
32
33#include "avcodec.h"
34#include "blockdsp.h"
35#include "bytestream.h"
36#include "elsdec.h"
37#include "get_bits.h"
38#include "idctdsp.h"
39#include "internal.h"
40#include "jpegtables.h"
41#include "mjpeg.h"
42
43#define EPIC_PIX_STACK_SIZE 1024
44#define EPIC_PIX_STACK_MAX (EPIC_PIX_STACK_SIZE - 1)
45
46enum ChunkType {
47 DISPLAY_INFO = 0xC8,
48 TILE_DATA,
49 CURSOR_POS,
50 CURSOR_SHAPE,
51 CHUNK_CC,
52 CHUNK_CD
53};
54
55enum Compression {
56 COMPR_EPIC_J_B = 2,
57 COMPR_KEMPF_J_B,
58};
59
60static const uint8_t luma_quant[64] = {
61 8, 6, 5, 8, 12, 20, 26, 31,
62 6, 6, 7, 10, 13, 29, 30, 28,
63 7, 7, 8, 12, 20, 29, 35, 28,
64 7, 9, 11, 15, 26, 44, 40, 31,
65 9, 11, 19, 28, 34, 55, 52, 39,
66 12, 18, 28, 32, 41, 52, 57, 46,
67 25, 32, 39, 44, 52, 61, 60, 51,
68 36, 46, 48, 49, 56, 50, 52, 50
69};
70
71static const uint8_t chroma_quant[64] = {
72 9, 9, 12, 24, 50, 50, 50, 50,
73 9, 11, 13, 33, 50, 50, 50, 50,
74 12, 13, 28, 50, 50, 50, 50, 50,
75 24, 33, 50, 50, 50, 50, 50, 50,
76 50, 50, 50, 50, 50, 50, 50, 50,
77 50, 50, 50, 50, 50, 50, 50, 50,
78 50, 50, 50, 50, 50, 50, 50, 50,
79 50, 50, 50, 50, 50, 50, 50, 50,
80};
81
82typedef struct ePICPixListElem {
83 struct ePICPixListElem *next;
84 uint32_t pixel;
85 uint8_t rung;
86} ePICPixListElem;
87
88typedef struct ePICPixHashElem {
89 uint32_t pix_id;
90 struct ePICPixListElem *list;
91} ePICPixHashElem;
92
93#define EPIC_HASH_SIZE 256
94typedef struct ePICPixHash {
95 ePICPixHashElem *bucket[EPIC_HASH_SIZE];
96 int bucket_size[EPIC_HASH_SIZE];
97 int bucket_fill[EPIC_HASH_SIZE];
98} ePICPixHash;
99
100typedef struct ePICContext {
101 ElsDecCtx els_ctx;
102 int next_run_pos;
103 ElsUnsignedRung unsigned_rung;
104 uint8_t W_flag_rung;
105 uint8_t N_flag_rung;
106 uint8_t W_ctx_rung[256];
107 uint8_t N_ctx_rung[512];
108 uint8_t nw_pred_rung[256];
109 uint8_t ne_pred_rung[256];
110 uint8_t prev_row_rung[14];
111 uint8_t runlen_zeroes[14];
112 uint8_t runlen_one;
113 int stack_pos;
114 uint32_t stack[EPIC_PIX_STACK_SIZE];
115 ePICPixHash hash;
116} ePICContext;
117
118typedef struct JPGContext {
119 BlockDSPContext bdsp;
120 IDCTDSPContext idsp;
121 ScanTable scantable;
122
123 VLC dc_vlc[2], ac_vlc[2];
124 int prev_dc[3];
125 DECLARE_ALIGNED(16, int16_t, block)[6][64];
126
127 uint8_t *buf;
128} JPGContext;
129
130typedef struct G2MContext {
131 ePICContext ec;
132 JPGContext jc;
133
134 int version;
135
136 int compression;
137 int width, height, bpp;
138 int orig_width, orig_height;
139 int tile_width, tile_height;
140 int tiles_x, tiles_y, tile_x, tile_y;
141
142 int got_header;
143
144 uint8_t *framebuf;
145 int framebuf_stride, old_width, old_height;
146
147 uint8_t *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base;
148 int tile_stride, epic_buf_stride, old_tile_w, old_tile_h;
149 int swapuv;
150
151 uint8_t *kempf_buf, *kempf_flags;
152
153 uint8_t *cursor;
154 int cursor_stride;
155 int cursor_fmt;
156 int cursor_w, cursor_h, cursor_x, cursor_y;
157 int cursor_hot_x, cursor_hot_y;
158} G2MContext;
159
160static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
161 const uint8_t *val_table, int nb_codes,
162 int is_ac)
163{
164 uint8_t huff_size[256] = { 0 };
165 uint16_t huff_code[256];
166 uint16_t huff_sym[256];
167 int i;
168
169 ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
170
171 for (i = 0; i < 256; i++)
172 huff_sym[i] = i + 16 * is_ac;
173
174 if (is_ac)
175 huff_sym[0] = 16 * 256;
176
177 return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
178 huff_code, 2, 2, huff_sym, 2, 2, 0);
179}
180
181static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
182{
183 int ret;
184
185 ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
186 avpriv_mjpeg_val_dc, 12, 0);
187 if (ret)
188 return ret;
189 ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
190 avpriv_mjpeg_val_dc, 12, 0);
191 if (ret)
192 return ret;
193 ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
194 avpriv_mjpeg_val_ac_luminance, 251, 1);
195 if (ret)
196 return ret;
197 ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
198 avpriv_mjpeg_val_ac_chrominance, 251, 1);
199 if (ret)
200 return ret;
201
202 ff_blockdsp_init(&c->bdsp, avctx);
203 ff_idctdsp_init(&c->idsp, avctx);
204 ff_init_scantable(c->idsp.idct_permutation, &c->scantable,
205 ff_zigzag_direct);
206
207 return 0;
208}
209
210static av_cold void jpg_free_context(JPGContext *ctx)
211{
212 int i;
213
214 for (i = 0; i < 2; i++) {
215 ff_free_vlc(&ctx->dc_vlc[i]);
216 ff_free_vlc(&ctx->ac_vlc[i]);
217 }
218
219 av_freep(&ctx->buf);
220}
221
222static void jpg_unescape(const uint8_t *src, int src_size,
223 uint8_t *dst, int *dst_size)
224{
225 const uint8_t *src_end = src + src_size;
226 uint8_t *dst_start = dst;
227
228 while (src < src_end) {
229 uint8_t x = *src++;
230
231 *dst++ = x;
232
233 if (x == 0xFF && !*src)
234 src++;
235 }
236 *dst_size = dst - dst_start;
237}
238
239static int jpg_decode_block(JPGContext *c, GetBitContext *gb,
240 int plane, int16_t *block)
241{
242 int dc, val, pos;
243 const int is_chroma = !!plane;
244 const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
245
246 c->bdsp.clear_block(block);
247 dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
248 if (dc < 0)
249 return AVERROR_INVALIDDATA;
250 if (dc)
251 dc = get_xbits(gb, dc);
252 dc = dc * qmat[0] + c->prev_dc[plane];
253 block[0] = dc;
254 c->prev_dc[plane] = dc;
255
256 pos = 0;
257 while (pos < 63) {
258 val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
259 if (val < 0)
260 return AVERROR_INVALIDDATA;
261 pos += val >> 4;
262 val &= 0xF;
263 if (pos > 63)
264 return val ? AVERROR_INVALIDDATA : 0;
265 if (val) {
266 int nbits = val;
267
268 val = get_xbits(gb, nbits);
269 val *= qmat[ff_zigzag_direct[pos]];
270 block[c->scantable.permutated[pos]] = val;
271 }
272 }
273 return 0;
274}
275
276static inline void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
277{
278 out[ridx] = av_clip_uint8(Y + (91881 * V + 32768 >> 16));
279 out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
280 out[2 - ridx] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
281}
282
283static int jpg_decode_data(JPGContext *c, int width, int height,
284 const uint8_t *src, int src_size,
285 uint8_t *dst, int dst_stride,
286 const uint8_t *mask, int mask_stride, int num_mbs,
287 int swapuv)
288{
289 GetBitContext gb;
290 int mb_w, mb_h, mb_x, mb_y, i, j;
291 int bx, by;
292 int unesc_size;
293 int ret;
294 const int ridx = swapuv ? 2 : 0;
295
296 if ((ret = av_reallocp(&c->buf,
297 src_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0)
298 return ret;
299 jpg_unescape(src, src_size, c->buf, &unesc_size);
300 memset(c->buf + unesc_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
301 if((ret = init_get_bits8(&gb, c->buf, unesc_size)) < 0)
302 return ret;
303
304 width = FFALIGN(width, 16);
305 mb_w = width >> 4;
306 mb_h = (height + 15) >> 4;
307
308 if (!num_mbs)
309 num_mbs = mb_w * mb_h * 4;
310
311 for (i = 0; i < 3; i++)
312 c->prev_dc[i] = 1024;
313 bx =
314 by = 0;
315 c->bdsp.clear_blocks(c->block[0]);
316 for (mb_y = 0; mb_y < mb_h; mb_y++) {
317 for (mb_x = 0; mb_x < mb_w; mb_x++) {
318 if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
319 !mask[mb_x * 2 + mask_stride] &&
320 !mask[mb_x * 2 + 1 + mask_stride]) {
321 bx += 16;
322 continue;
323 }
324 for (j = 0; j < 2; j++) {
325 for (i = 0; i < 2; i++) {
326 if (mask && !mask[mb_x * 2 + i + j * mask_stride])
327 continue;
328 num_mbs--;
329 if ((ret = jpg_decode_block(c, &gb, 0,
330 c->block[i + j * 2])) != 0)
331 return ret;
332 c->idsp.idct(c->block[i + j * 2]);
333 }
334 }
335 for (i = 1; i < 3; i++) {
336 if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
337 return ret;
338 c->idsp.idct(c->block[i + 3]);
339 }
340
341 for (j = 0; j < 16; j++) {
342 uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
343 for (i = 0; i < 16; i++) {
344 int Y, U, V;
345
346 Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
347 U = c->block[4][(i >> 1) + (j >> 1) * 8] - 128;
348 V = c->block[5][(i >> 1) + (j >> 1) * 8] - 128;
349 yuv2rgb(out + i * 3, ridx, Y, U, V);
350 }
351 }
352
353 if (!num_mbs)
354 return 0;
355 bx += 16;
356 }
357 bx = 0;
358 by += 16;
359 if (mask)
360 mask += mask_stride * 2;
361 }
362
363 return 0;
364}
365
366#define LOAD_NEIGHBOURS(x) \
367 W = curr_row[(x) - 1]; \
368 N = above_row[(x)]; \
369 WW = curr_row[(x) - 2]; \
370 NW = above_row[(x) - 1]; \
371 NE = above_row[(x) + 1]; \
372 NN = above2_row[(x)]; \
373 NNW = above2_row[(x) - 1]; \
374 NWW = above_row[(x) - 2]; \
375 NNE = above2_row[(x) + 1]
376
377#define UPDATE_NEIGHBOURS(x) \
378 NNW = NN; \
379 NN = NNE; \
380 NWW = NW; \
381 NW = N; \
382 N = NE; \
383 NE = above_row[(x) + 1]; \
384 NNE = above2_row[(x) + 1]
385
386#define R_shift 16
387#define G_shift 8
388#define B_shift 0
389
390/* improved djb2 hash from http://www.cse.yorku.ca/~oz/hash.html */
391static int djb2_hash(uint32_t key)
392{
393 uint32_t h = 5381;
394
395 h = (h * 33) ^ ((key >> 24) & 0xFF); // xxx: probably not needed at all
396 h = (h * 33) ^ ((key >> 16) & 0xFF);
397 h = (h * 33) ^ ((key >> 8) & 0xFF);
398 h = (h * 33) ^ (key & 0xFF);
399
400 return h & (EPIC_HASH_SIZE - 1);
401}
402
403static void epic_hash_init(ePICPixHash *hash)
404{
405 memset(hash, 0, sizeof(*hash));
406}
407
408static ePICPixHashElem *epic_hash_find(const ePICPixHash *hash, uint32_t key)
409{
410 int i, idx = djb2_hash(key);
411 ePICPixHashElem *bucket = hash->bucket[idx];
412
413 for (i = 0; i < hash->bucket_fill[idx]; i++)
414 if (bucket[i].pix_id == key)
415 return &bucket[i];
416
417 return NULL;
418}
419
420static ePICPixHashElem *epic_hash_add(ePICPixHash *hash, uint32_t key)
421{
422 ePICPixHashElem *bucket, *ret;
423 int idx = djb2_hash(key);
424
425 if (hash->bucket_size[idx] > INT_MAX / sizeof(**hash->bucket))
426 return NULL;
427
428 if (!(hash->bucket_fill[idx] < hash->bucket_size[idx])) {
429 int new_size = hash->bucket_size[idx] + 16;
430 bucket = av_realloc(hash->bucket[idx], new_size * sizeof(*bucket));
431 if (!bucket)
432 return NULL;
433 hash->bucket[idx] = bucket;
434 hash->bucket_size[idx] = new_size;
435 }
436
437 ret = &hash->bucket[idx][hash->bucket_fill[idx]++];
438 memset(ret, 0, sizeof(*ret));
439 ret->pix_id = key;
440 return ret;
441}
442
443static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
444{
445 ePICPixListElem *new_elem;
446 ePICPixHashElem *hash_elem = epic_hash_find(hash, key);
447
448 if (!hash_elem) {
449 if (!(hash_elem = epic_hash_add(hash, key)))
450 return AVERROR(ENOMEM);
451 }
452
453 new_elem = av_mallocz(sizeof(*new_elem));
454 if (!new_elem)
455 return AVERROR(ENOMEM);
456
457 new_elem->pixel = pix;
458 new_elem->next = hash_elem->list;
459 hash_elem->list = new_elem;
460
461 return 0;
462}
463
464static inline int epic_cache_entries_for_pixel(const ePICPixHash *hash,
465 uint32_t pix)
466{
467 ePICPixHashElem *hash_elem = epic_hash_find(hash, pix);
468
469 if (hash_elem != NULL && hash_elem->list != NULL)
470 return 1;
471
472 return 0;
473}
474
475static void epic_free_pixel_cache(ePICPixHash *hash)
476{
477 int i, j;
478
479 for (i = 0; i < EPIC_HASH_SIZE; i++) {
480 for (j = 0; j < hash->bucket_fill[i]; j++) {
481 ePICPixListElem *list_elem = hash->bucket[i][j].list;
482 while (list_elem) {
483 ePICPixListElem *tmp = list_elem->next;
484 av_free(list_elem);
485 list_elem = tmp;
486 }
487 }
488 av_freep(&hash->bucket[i]);
489 hash->bucket_size[i] =
490 hash->bucket_fill[i] = 0;
491 }
492}
493
494static inline int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
495{
496 int i;
497
498 for (i = 0; i < dc->stack_pos; i++)
499 if (dc->stack[i] == pix)
500 break;
501
502 return i != dc->stack_pos;
503}
504
505#define TOSIGNED(val) (((val) >> 1) ^ -((val) & 1))
506
507static inline int epic_decode_component_pred(ePICContext *dc,
508 int N, int W, int NW)
509{
510 unsigned delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
511 return mid_pred(N, N + W - NW, W) - TOSIGNED(delta);
512}
513
514static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y,
515 const uint32_t *curr_row,
516 const uint32_t *above_row)
517{
518 uint32_t N, W, NW, pred;
519 unsigned delta;
520 int GN, GW, GNW, R, G, B;
521
522 if (x && y) {
523 W = curr_row[x - 1];
524 N = above_row[x];
525 NW = above_row[x - 1];
526
527 GN = (N >> G_shift) & 0xFF;
528 GW = (W >> G_shift) & 0xFF;
529 GNW = (NW >> G_shift) & 0xFF;
530
531 G = epic_decode_component_pred(dc, GN, GW, GNW);
532
533 R = G + epic_decode_component_pred(dc,
534 ((N >> R_shift) & 0xFF) - GN,
535 ((W >> R_shift) & 0xFF) - GW,
536 ((NW >> R_shift) & 0xFF) - GNW);
537
538 B = G + epic_decode_component_pred(dc,
539 ((N >> B_shift) & 0xFF) - GN,
540 ((W >> B_shift) & 0xFF) - GW,
541 ((NW >> B_shift) & 0xFF) - GNW);
542 } else {
543 if (x)
544 pred = curr_row[x - 1];
545 else
546 pred = above_row[x];
547
548 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
549 R = ((pred >> R_shift) & 0xFF) - TOSIGNED(delta);
550
551 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
552 G = ((pred >> G_shift) & 0xFF) - TOSIGNED(delta);
553
554 delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
555 B = ((pred >> B_shift) & 0xFF) - TOSIGNED(delta);
556 }
557
558 if (R<0 || G<0 || B<0) {
559 av_log(NULL, AV_LOG_ERROR, "RGB %d %d %d is out of range\n", R, G, B);
560 return 0;
561 }
562
563 return (R << R_shift) | (G << G_shift) | (B << B_shift);
564}
565
566static int epic_predict_pixel(ePICContext *dc, uint8_t *rung,
567 uint32_t *pPix, uint32_t pix)
568{
569 if (!ff_els_decode_bit(&dc->els_ctx, rung)) {
570 *pPix = pix;
571 return 1;
572 }
573 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
574 return 0;
575}
576
577static int epic_handle_edges(ePICContext *dc, int x, int y,
578 const uint32_t *curr_row,
579 const uint32_t *above_row, uint32_t *pPix)
580{
581 uint32_t pix;
582
583 if (!x && !y) { /* special case: top-left pixel */
584 /* the top-left pixel is coded independently with 3 unsigned numbers */
585 *pPix = (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << R_shift) |
586 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << G_shift) |
587 (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << B_shift);
588 return 1;
589 }
590
591 if (x) { /* predict from W first */
592 pix = curr_row[x - 1];
593 if (epic_predict_pixel(dc, &dc->W_flag_rung, pPix, pix))
594 return 1;
595 }
596
597 if (y) { /* then try to predict from N */
598 pix = above_row[x];
599 if (!dc->stack_pos || dc->stack[0] != pix) {
600 if (epic_predict_pixel(dc, &dc->N_flag_rung, pPix, pix))
601 return 1;
602 }
603 }
604
605 return 0;
606}
607
608static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width,
609 const uint32_t *curr_row,
610 const uint32_t *above_row,
611 const uint32_t *above2_row,
612 uint32_t *pPix, int *pRun)
613{
614 int idx, got_pixel = 0, WWneW, old_WWneW = 0;
615 uint32_t W, WW, N, NN, NW, NE, NWW, NNW, NNE;
616
617 *pRun = 0;
618
619 LOAD_NEIGHBOURS(x);
620
621 if (dc->next_run_pos == x) {
622 /* can't reuse W for the new pixel in this case */
623 WWneW = 1;
624 } else {
625 idx = (WW != W) << 7 |
626 (NW != W) << 6 |
627 (N != NE) << 5 |
628 (NW != N) << 4 |
629 (NWW != NW) << 3 |
630 (NNE != NE) << 2 |
631 (NN != N) << 1 |
632 (NNW != NW);
633 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
634 if (WWneW < 0)
635 return WWneW;
636 }
637
638 if (WWneW)
639 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = W;
640 else {
641 *pPix = W;
642 got_pixel = 1;
643 }
644
645 do {
646 int NWneW = 1;
647 if (got_pixel) // pixel value already known (derived from either W or N)
648 NWneW = *pPix != N;
649 else { // pixel value is unknown and will be decoded later
650 NWneW = *pRun ? NWneW : NW != W;
651
652 /* TODO: RFC this mess! */
653 switch (((NW != N) << 2) | (NWneW << 1) | WWneW) {
654 case 0:
655 break; // do nothing here
656 case 3:
657 case 5:
658 case 6:
659 case 7:
660 if (!is_pixel_on_stack(dc, N)) {
661 idx = WWneW << 8 |
662 (*pRun ? old_WWneW : WW != W) << 7 |
663 NWneW << 6 |
664 (N != NE) << 5 |
665 (NW != N) << 4 |
666 (NWW != NW) << 3 |
667 (NNE != NE) << 2 |
668 (NN != N) << 1 |
669 (NNW != NW);
670 if (!ff_els_decode_bit(&dc->els_ctx, &dc->N_ctx_rung[idx])) {
671 NWneW = 0;
672 *pPix = N;
673 got_pixel = 1;
674 break;
675 }
676 }
677 /* fall through */
678 default:
679 NWneW = 1;
680 old_WWneW = WWneW;
681 if (!is_pixel_on_stack(dc, N))
682 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = N;
683 }
684 }
685
686 (*pRun)++;
687 if (x + *pRun >= tile_width - 1)
688 break;
689
690 UPDATE_NEIGHBOURS(x + *pRun);
691
692 if (!NWneW && NW == N && N == NE) {
693 int pos, run, rle;
694 int start_pos = x + *pRun;
695
696 /* scan for a run of pix in the line above */
697 uint32_t pix = above_row[start_pos + 1];
698 for (pos = start_pos + 2; pos < tile_width; pos++)
699 if (!(above_row[pos] == pix))
700 break;
701 run = pos - start_pos - 1;
702 idx = av_ceil_log2(run);
703 if (ff_els_decode_bit(&dc->els_ctx, &dc->prev_row_rung[idx]))
704 *pRun += run;
705 else {
706 int flag;
707 /* run-length is coded as plain binary number of idx - 1 bits */
708 for (pos = idx - 1, rle = 0, flag = 0; pos >= 0; pos--) {
709 if ((1 << pos) + rle < run &&
710 ff_els_decode_bit(&dc->els_ctx,
711 flag ? &dc->runlen_one
712 : &dc->runlen_zeroes[pos])) {
713 flag = 1;
714 rle |= 1 << pos;
715 }
716 }
717 *pRun += rle;
718 break; // return immediately
719 }
720 if (x + *pRun >= tile_width - 1)
721 break;
722
723 LOAD_NEIGHBOURS(x + *pRun);
724 WWneW = 0;
725 NWneW = 0;
726 }
727
728 idx = WWneW << 7 |
729 NWneW << 6 |
730 (N != NE) << 5 |
731 (NW != N) << 4 |
732 (NWW != NW) << 3 |
733 (NNE != NE) << 2 |
734 (NN != N) << 1 |
735 (NNW != NW);
736 WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
737 } while (!WWneW);
738
739 dc->next_run_pos = x + *pRun;
740 return got_pixel;
741}
742
743static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung,
744 uint32_t *pPix, uint32_t pix)
745{
746 if (ff_els_decode_bit(&dc->els_ctx, rung)) {
747 *pPix = pix;
748 return 1;
749 }
750 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
751 return 0;
752}
753
754static int epic_predict_from_NW_NE(ePICContext *dc, int x, int y, int run,
755 int tile_width, const uint32_t *curr_row,
756 const uint32_t *above_row, uint32_t *pPix)
757{
758 int pos;
759
760 /* try to reuse the NW pixel first */
761 if (x && y) {
762 uint32_t NW = above_row[x - 1];
763 if (NW != curr_row[x - 1] && NW != above_row[x] && !is_pixel_on_stack(dc, NW)) {
764 if (epic_predict_pixel2(dc, &dc->nw_pred_rung[NW & 0xFF], pPix, NW))
765 return 1;
766 }
767 }
768
769 /* try to reuse the NE[x + run, y] pixel */
770 pos = x + run - 1;
771 if (pos < tile_width - 1 && y) {
772 uint32_t NE = above_row[pos + 1];
773 if (NE != above_row[pos] && !is_pixel_on_stack(dc, NE)) {
774 if (epic_predict_pixel2(dc, &dc->ne_pred_rung[NE & 0xFF], pPix, NE))
775 return 1;
776 }
777 }
778
779 return 0;
780}
781
782static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix)
783{
784 ePICPixListElem *list, *prev = NULL;
785 ePICPixHashElem *hash_elem = epic_hash_find(&dc->hash, W);
786
787 if (!hash_elem || !hash_elem->list)
788 return 0;
789
790 list = hash_elem->list;
791 while (list) {
792 if (!is_pixel_on_stack(dc, list->pixel)) {
793 if (ff_els_decode_bit(&dc->els_ctx, &list->rung)) {
794 *pPix = list->pixel;
795 if (list != hash_elem->list) {
796 prev->next = list->next;
797 list->next = hash_elem->list;
798 hash_elem->list = list;
799 }
800 return 1;
801 }
802 dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = list->pixel;
803 }
804 prev = list;
805 list = list->next;
806 }
807
808 return 0;
809}
810
811static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height,
812 int tile_width, int stride)
813{
814 int x, y;
815 uint32_t pix;
816 uint32_t *curr_row = NULL, *above_row = NULL, *above2_row;
817
818 for (y = 0; y < tile_height; y++, out += stride) {
819 above2_row = above_row;
820 above_row = curr_row;
821 curr_row = (uint32_t *) out;
822
823 for (x = 0, dc->next_run_pos = 0; x < tile_width;) {
824 if (dc->els_ctx.err)
825 return AVERROR_INVALIDDATA; // bail out in the case of ELS overflow
826
827 pix = curr_row[x - 1]; // get W pixel
828
829 if (y >= 1 && x >= 2 &&
830 pix != curr_row[x - 2] && pix != above_row[x - 1] &&
831 pix != above_row[x - 2] && pix != above_row[x] &&
832 !epic_cache_entries_for_pixel(&dc->hash, pix)) {
833 curr_row[x] = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
834 x++;
835 } else {
836 int got_pixel, run;
837 dc->stack_pos = 0; // empty stack
838
839 if (y < 2 || x < 2 || x == tile_width - 1) {
840 run = 1;
841 got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix);
842 } else {
843 got_pixel = epic_decode_run_length(dc, x, y, tile_width,
844 curr_row, above_row,
845 above2_row, &pix, &run);
846 if (got_pixel < 0)
847 return got_pixel;
848 }
849
850 if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run,
851 tile_width, curr_row,
852 above_row, &pix)) {
853 uint32_t ref_pix = curr_row[x - 1];
854 if (!x || !epic_decode_from_cache(dc, ref_pix, &pix)) {
855 pix = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
856 if (x) {
857 int ret = epic_add_pixel_to_cache(&dc->hash,
858 ref_pix,
859 pix);
860 if (ret)
861 return ret;
862 }
863 }
864 }
865 for (; run > 0; x++, run--)
866 curr_row[x] = pix;
867 }
868 }
869 }
870
871 return 0;
872}
873
874static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y,
875 const uint8_t *src, size_t src_size,
876 AVCodecContext *avctx)
877{
878 uint8_t prefix, mask = 0x80;
879 int extrabytes, tile_width, tile_height, awidth, aheight;
880 size_t els_dsize;
881 uint8_t *dst;
882
883 if (!src_size)
884 return 0;
885
886 /* get data size of the ELS partition as unsigned variable-length integer */
887 prefix = *src++;
888 src_size--;
889 for (extrabytes = 0; (prefix & mask) && (extrabytes < 7); extrabytes++)
890 mask >>= 1;
891 if (extrabytes > 3 || src_size < extrabytes) {
892 av_log(avctx, AV_LOG_ERROR, "ePIC: invalid data size VLI\n");
893 return AVERROR_INVALIDDATA;
894 }
895
896 els_dsize = prefix & ((0x80 >> extrabytes) - 1); // mask out the length prefix
897 while (extrabytes-- > 0) {
898 els_dsize = (els_dsize << 8) | *src++;
899 src_size--;
900 }
901
902 if (src_size < els_dsize) {
903 av_log(avctx, AV_LOG_ERROR, "ePIC: data too short, needed %"SIZE_SPECIFIER", got %"SIZE_SPECIFIER"\n",
904 els_dsize, src_size);
905 return AVERROR_INVALIDDATA;
906 }
907
908 tile_width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
909 tile_height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
910 awidth = FFALIGN(tile_width, 16);
911 aheight = FFALIGN(tile_height, 16);
912
913 if (els_dsize) {
914 int ret, i, j, k;
915 uint8_t tr_r, tr_g, tr_b, *buf;
916 uint32_t *in;
917 /* ELS decoder initializations */
918 memset(&c->ec, 0, sizeof(c->ec));
919 ff_els_decoder_init(&c->ec.els_ctx, src, els_dsize);
920 epic_hash_init(&c->ec.hash);
921
922 /* decode transparent pixel value */
923 tr_r = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
924 tr_g = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
925 tr_b = ff_els_decode_unsigned(&c->ec.els_ctx, &c->ec.unsigned_rung);
926 if (c->ec.els_ctx.err != 0) {
927 av_log(avctx, AV_LOG_ERROR,
928 "ePIC: couldn't decode transparency pixel!\n");
929 return AVERROR_INVALIDDATA;
930 }
931
932 ret = epic_decode_tile(&c->ec, c->epic_buf, tile_height, tile_width,
933 c->epic_buf_stride);
934
935 epic_free_pixel_cache(&c->ec.hash);
936 ff_els_decoder_uninit(&c->ec.unsigned_rung);
937
938 if (ret) {
939 av_log(avctx, AV_LOG_ERROR,
940 "ePIC: tile decoding failed, frame=%d, tile_x=%d, tile_y=%d\n",
941 avctx->frame_number, tile_x, tile_y);
942 return AVERROR_INVALIDDATA;
943 }
944
945 buf = c->epic_buf;
946 dst = c->framebuf + tile_x * c->tile_width * 3 +
947 tile_y * c->tile_height * c->framebuf_stride;
948
949 for (j = 0; j < tile_height; j++) {
950 uint8_t *out = dst;
951 in = (uint32_t *) buf;
952 for (i = 0; i < tile_width; i++) {
953 out[0] = (in[i] >> R_shift) & 0xFF;
954 out[1] = (in[i] >> G_shift) & 0xFF;
955 out[2] = (in[i] >> B_shift) & 0xFF;
956 out += 3;
957 }
958 buf += c->epic_buf_stride;
959 dst += c->framebuf_stride;
960 }
961
962 if (src_size > els_dsize) {
963 uint8_t *jpg;
964 uint32_t tr;
965 int bstride = FFALIGN(tile_width, 16) >> 3;
966 int nblocks = 0;
967 int estride = c->epic_buf_stride >> 2;
968
969 src += els_dsize;
970 src_size -= els_dsize;
971
972 in = (uint32_t *) c->epic_buf;
973 tr = (tr_r << R_shift) | (tr_g << G_shift) | (tr_b << B_shift);
974
975 memset(c->kempf_flags, 0,
976 (aheight >> 3) * bstride * sizeof(*c->kempf_flags));
977 for (j = 0; j < tile_height; j += 8) {
978 for (i = 0; i < tile_width; i += 8) {
979 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 0;
980 for (k = 0; k < 8 * 8; k++) {
981 if (in[i + (k & 7) + (k >> 3) * estride] == tr) {
982 c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 1;
983 nblocks++;
984 break;
985 }
986 }
987 }
988 in += 8 * estride;
989 }
990
991 memset(c->jpeg_tile, 0, c->tile_stride * aheight);
992 jpg_decode_data(&c->jc, awidth, aheight, src, src_size,
993 c->jpeg_tile, c->tile_stride,
994 c->kempf_flags, bstride, nblocks, c->swapuv);
995
996 in = (uint32_t *) c->epic_buf;
997 dst = c->framebuf + tile_x * c->tile_width * 3 +
998 tile_y * c->tile_height * c->framebuf_stride;
999 jpg = c->jpeg_tile;
1000 for (j = 0; j < tile_height; j++) {
1001 for (i = 0; i < tile_width; i++)
1002 if (in[i] == tr)
1003 memcpy(dst + i * 3, jpg + i * 3, 3);
1004 in += c->epic_buf_stride >> 2;
1005 dst += c->framebuf_stride;
1006 jpg += c->tile_stride;
1007 }
1008 }
1009 } else {
1010 dst = c->framebuf + tile_x * c->tile_width * 3 +
1011 tile_y * c->tile_height * c->framebuf_stride;
1012 return jpg_decode_data(&c->jc, tile_width, tile_height, src, src_size,
1013 dst, c->framebuf_stride, NULL, 0, 0, c->swapuv);
1014 }
1015
1016 return 0;
1017}
1018
1019static int kempf_restore_buf(const uint8_t *src, int len,
1020 uint8_t *dst, int stride,
1021 const uint8_t *jpeg_tile, int tile_stride,
1022 int width, int height,
1023 const uint8_t *pal, int npal, int tidx)
1024{
1025 GetBitContext gb;
1026 int i, j, nb, col;
1027 int ret;
1028 int align_width = FFALIGN(width, 16);
1029
1030 if ((ret = init_get_bits8(&gb, src, len)) < 0)
1031 return ret;
1032
1033 if (npal <= 2) nb = 1;
1034 else if (npal <= 4) nb = 2;
1035 else if (npal <= 16) nb = 4;
1036 else nb = 8;
1037
1038 for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
1039 if (get_bits(&gb, 8))
1040 continue;
1041 for (i = 0; i < width; i++) {
1042 col = get_bits(&gb, nb);
1043 if (col != tidx)
1044 memcpy(dst + i * 3, pal + col * 3, 3);
1045 else
1046 memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
1047 }
1048 skip_bits_long(&gb, nb * (align_width - width));
1049 }
1050
1051 return 0;
1052}
1053
1054static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
1055 const uint8_t *src, int src_size)
1056{
1057 int width, height;
1058 int hdr, zsize, npal, tidx = -1, ret;
1059 int i, j;
1060 const uint8_t *src_end = src + src_size;
1061 uint8_t pal[768], transp[3];
1062 uLongf dlen = (c->tile_width + 1) * c->tile_height;
1063 int sub_type;
1064 int nblocks, cblocks, bstride;
1065 int bits, bitbuf, coded;
1066 uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
1067 tile_y * c->tile_height * c->framebuf_stride;
1068
1069 if (src_size < 2)
1070 return AVERROR_INVALIDDATA;
1071
1072 width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
1073 height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
1074
1075 hdr = *src++;
1076 sub_type = hdr >> 5;
1077 if (sub_type == 0) {
1078 int j;
1079 memcpy(transp, src, 3);
1080 src += 3;
1081 for (j = 0; j < height; j++, dst += c->framebuf_stride)
1082 for (i = 0; i < width; i++)
1083 memcpy(dst + i * 3, transp, 3);
1084 return 0;
1085 } else if (sub_type == 1) {
1086 return jpg_decode_data(&c->jc, width, height, src, src_end - src,
1087 dst, c->framebuf_stride, NULL, 0, 0, 0);
1088 }
1089
1090 if (sub_type != 2) {
1091 memcpy(transp, src, 3);
1092 src += 3;
1093 }
1094 npal = *src++ + 1;
1095 if (src_end - src < npal * 3)
1096 return AVERROR_INVALIDDATA;
1097 memcpy(pal, src, npal * 3);
1098 src += npal * 3;
1099 if (sub_type != 2) {
1100 for (i = 0; i < npal; i++) {
1101 if (!memcmp(pal + i * 3, transp, 3)) {
1102 tidx = i;
1103 break;
1104 }
1105 }
1106 }
1107
1108 if (src_end - src < 2)
1109 return 0;
1110 zsize = (src[0] << 8) | src[1];
1111 src += 2;
1112
1113 if (src_end - src < zsize + (sub_type != 2))
1114 return AVERROR_INVALIDDATA;
1115
1116 ret = uncompress(c->kempf_buf, &dlen, src, zsize);
1117 if (ret)
1118 return AVERROR_INVALIDDATA;
1119 src += zsize;
1120
1121 if (sub_type == 2) {
1122 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1123 NULL, 0, width, height, pal, npal, tidx);
1124 return 0;
1125 }
1126
1127 nblocks = *src++ + 1;
1128 cblocks = 0;
1129 bstride = FFALIGN(width, 16) >> 3;
1130 // blocks are coded LSB and we need normal bitreader for JPEG data
1131 bits = 0;
1132 for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
1133 for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
1134 if (!bits) {
1135 if (src >= src_end)
1136 return AVERROR_INVALIDDATA;
1137 bitbuf = *src++;
1138 bits = 8;
1139 }
1140 coded = bitbuf & 1;
1141 bits--;
1142 bitbuf >>= 1;
1143 cblocks += coded;
1144 if (cblocks > nblocks)
1145 return AVERROR_INVALIDDATA;
1146 c->kempf_flags[j * 2 + i * 2 * bstride] =
1147 c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
1148 c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
1149 c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
1150 }
1151 }
1152
1153 memset(c->jpeg_tile, 0, c->tile_stride * height);
1154 jpg_decode_data(&c->jc, width, height, src, src_end - src,
1155 c->jpeg_tile, c->tile_stride,
1156 c->kempf_flags, bstride, nblocks * 4, 0);
1157
1158 kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1159 c->jpeg_tile, c->tile_stride,
1160 width, height, pal, npal, tidx);
1161
1162 return 0;
1163}
1164
1165static int g2m_init_buffers(G2MContext *c)
1166{
1167 int aligned_height;
1168
1169 if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
1170 c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
1171 aligned_height = c->height + 15;
1172 av_free(c->framebuf);
1173 c->framebuf = av_mallocz_array(c->framebuf_stride, aligned_height);
1174 if (!c->framebuf)
1175 return AVERROR(ENOMEM);
1176 }
1177 if (!c->synth_tile || !c->jpeg_tile ||
1178 (c->compression == 2 && !c->epic_buf_base) ||
1179 c->old_tile_w < c->tile_width ||
1180 c->old_tile_h < c->tile_height) {
1181 c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
1182 c->epic_buf_stride = FFALIGN(c->tile_width * 4, 16);
1183 aligned_height = FFALIGN(c->tile_height, 16);
1184 av_freep(&c->synth_tile);
1185 av_freep(&c->jpeg_tile);
1186 av_freep(&c->kempf_buf);
1187 av_freep(&c->kempf_flags);
1188 av_freep(&c->epic_buf_base);
1189 c->epic_buf = NULL;
1190 c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
1191 c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
1192 c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height +
1193 AV_INPUT_BUFFER_PADDING_SIZE);
1194 c->kempf_flags = av_mallocz(c->tile_width * aligned_height);
1195 if (!c->synth_tile || !c->jpeg_tile ||
1196 !c->kempf_buf || !c->kempf_flags)
1197 return AVERROR(ENOMEM);
1198 if (c->compression == 2) {
1199 c->epic_buf_base = av_mallocz(c->epic_buf_stride * aligned_height + 4);
1200 if (!c->epic_buf_base)
1201 return AVERROR(ENOMEM);
1202 c->epic_buf = c->epic_buf_base + 4;
1203 }
1204 }
1205
1206 return 0;
1207}
1208
1209static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
1210 GetByteContext *gb)
1211{
1212 int i, j, k;
1213 uint8_t *dst;
1214 uint32_t bits;
1215 uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
1216 uint32_t cursor_hot_x, cursor_hot_y;
1217 int cursor_fmt, err;
1218
1219 cur_size = bytestream2_get_be32(gb);
1220 cursor_w = bytestream2_get_byte(gb);
1221 cursor_h = bytestream2_get_byte(gb);
1222 cursor_hot_x = bytestream2_get_byte(gb);
1223 cursor_hot_y = bytestream2_get_byte(gb);
1224 cursor_fmt = bytestream2_get_byte(gb);
1225
1226 cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
1227
1228 if (cursor_w < 1 || cursor_w > 256 ||
1229 cursor_h < 1 || cursor_h > 256) {
1230 av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
1231 cursor_w, cursor_h);
1232 return AVERROR_INVALIDDATA;
1233 }
1234 if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
1235 av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
1236 cursor_hot_x, cursor_hot_y);
1237 cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
1238 cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
1239 }
1240 if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
1241 c->cursor_w * c->cursor_h / 4 > cur_size) {
1242 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
1243 cur_size, bytestream2_get_bytes_left(gb));
1244 return AVERROR_INVALIDDATA;
1245 }
1246 if (cursor_fmt != 1 && cursor_fmt != 32) {
1247 avpriv_report_missing_feature(avctx, "Cursor format %d",
1248 cursor_fmt);
1249 return AVERROR_PATCHWELCOME;
1250 }
1251
1252 if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
1253 av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
1254 return err;
1255 }
1256
1257 c->cursor_w = cursor_w;
1258 c->cursor_h = cursor_h;
1259 c->cursor_hot_x = cursor_hot_x;
1260 c->cursor_hot_y = cursor_hot_y;
1261 c->cursor_fmt = cursor_fmt;
1262 c->cursor_stride = cursor_stride;
1263
1264 dst = c->cursor;
1265 switch (c->cursor_fmt) {
1266 case 1: // old monochrome
1267 for (j = 0; j < c->cursor_h; j++) {
1268 for (i = 0; i < c->cursor_w; i += 32) {
1269 bits = bytestream2_get_be32(gb);
1270 for (k = 0; k < 32; k++) {
1271 dst[0] = !!(bits & 0x80000000);
1272 dst += 4;
1273 bits <<= 1;
1274 }
1275 }
1276 }
1277
1278 dst = c->cursor;
1279 for (j = 0; j < c->cursor_h; j++) {
1280 for (i = 0; i < c->cursor_w; i += 32) {
1281 bits = bytestream2_get_be32(gb);
1282 for (k = 0; k < 32; k++) {
1283 int mask_bit = !!(bits & 0x80000000);
1284 switch (dst[0] * 2 + mask_bit) {
1285 case 0:
1286 dst[0] = 0xFF;
1287 dst[1] = 0x00;
1288 dst[2] = 0x00;
1289 dst[3] = 0x00;
1290 break;
1291 case 1:
1292 dst[0] = 0xFF;
1293 dst[1] = 0xFF;
1294 dst[2] = 0xFF;
1295 dst[3] = 0xFF;
1296 break;
1297 default:
1298 dst[0] = 0x00;
1299 dst[1] = 0x00;
1300 dst[2] = 0x00;
1301 dst[3] = 0x00;
1302 }
1303 dst += 4;
1304 bits <<= 1;
1305 }
1306 }
1307 }
1308 break;
1309 case 32: // full colour
1310 /* skip monochrome version of the cursor and decode RGBA instead */
1311 bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
1312 for (j = 0; j < c->cursor_h; j++) {
1313 for (i = 0; i < c->cursor_w; i++) {
1314 int val = bytestream2_get_be32(gb);
1315 *dst++ = val >> 0;
1316 *dst++ = val >> 8;
1317 *dst++ = val >> 16;
1318 *dst++ = val >> 24;
1319 }
1320 }
1321 break;
1322 default:
1323 return AVERROR_PATCHWELCOME;
1324 }
1325 return 0;
1326}
1327
1328#define APPLY_ALPHA(src, new, alpha) \
1329 src = (src * (256 - alpha) + new * alpha) >> 8
1330
1331static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
1332{
1333 int i, j;
1334 int x, y, w, h;
1335 const uint8_t *cursor;
1336
1337 if (!c->cursor)
1338 return;
1339
1340 x = c->cursor_x - c->cursor_hot_x;
1341 y = c->cursor_y - c->cursor_hot_y;
1342
1343 cursor = c->cursor;
1344 w = c->cursor_w;
1345 h = c->cursor_h;
1346
1347 if (x + w > c->width)
1348 w = c->width - x;
1349 if (y + h > c->height)
1350 h = c->height - y;
1351 if (x < 0) {
1352 w += x;
1353 cursor += -x * 4;
1354 } else {
1355 dst += x * 3;
1356 }
1357 if (y < 0) {
1358 h += y;
1359 cursor += -y * c->cursor_stride;
1360 } else {
1361 dst += y * stride;
1362 }
1363 if (w < 0 || h < 0)
1364 return;
1365
1366 for (j = 0; j < h; j++) {
1367 for (i = 0; i < w; i++) {
1368 uint8_t alpha = cursor[i * 4];
1369 APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
1370 APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
1371 APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
1372 }
1373 dst += stride;
1374 cursor += c->cursor_stride;
1375 }
1376}
1377
1378static int g2m_decode_frame(AVCodecContext *avctx, void *data,
1379 int *got_picture_ptr, AVPacket *avpkt)
1380{
1381 const uint8_t *buf = avpkt->data;
1382 int buf_size = avpkt->size;
1383 G2MContext *c = avctx->priv_data;
1384 AVFrame *pic = data;
1385 GetByteContext bc, tbc;
1386 int magic;
1387 int got_header = 0;
1388 uint32_t chunk_size, r_mask, g_mask, b_mask;
1389 int chunk_type, chunk_start;
1390 int i;
1391 int ret;
1392
1393 if (buf_size < 12) {
1394 av_log(avctx, AV_LOG_ERROR,
1395 "Frame should have at least 12 bytes, got %d instead\n",
1396 buf_size);
1397 return AVERROR_INVALIDDATA;
1398 }
1399
1400 bytestream2_init(&bc, buf, buf_size);
1401
1402 magic = bytestream2_get_be32(&bc);
1403 if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
1404 (magic & 0xF) < 2 || (magic & 0xF) > 5) {
1405 av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
1406 return AVERROR_INVALIDDATA;
1407 }
1408
1409 c->swapuv = magic == MKBETAG('G', '2', 'M', '2');
1410
1411 while (bytestream2_get_bytes_left(&bc) > 5) {
1412 chunk_size = bytestream2_get_le32(&bc) - 1;
1413 chunk_type = bytestream2_get_byte(&bc);
1414 chunk_start = bytestream2_tell(&bc);
1415 if (chunk_size > bytestream2_get_bytes_left(&bc)) {
1416 av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
1417 chunk_size, chunk_type);
1418 break;
1419 }
1420 switch (chunk_type) {
1421 case DISPLAY_INFO:
1422 got_header =
1423 c->got_header = 0;
1424 if (chunk_size < 21) {
1425 av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
1426 chunk_size);
1427 break;
1428 }
1429 c->width = bytestream2_get_be32(&bc);
1430 c->height = bytestream2_get_be32(&bc);
1431 if (c->width < 16 || c->height < 16) {
1432 av_log(avctx, AV_LOG_ERROR,
1433 "Invalid frame dimensions %dx%d\n",
1434 c->width, c->height);
1435 ret = AVERROR_INVALIDDATA;
1436 goto header_fail;
1437 }
1438 if (c->width != avctx->width || c->height != avctx->height) {
1439 ret = ff_set_dimensions(avctx, c->width, c->height);
1440 if (ret < 0)
1441 goto header_fail;
1442 }
1443 c->compression = bytestream2_get_be32(&bc);
1444 if (c->compression != 2 && c->compression != 3) {
1445 avpriv_report_missing_feature(avctx, "Compression method %d",
1446 c->compression);
1447 ret = AVERROR_PATCHWELCOME;
1448 goto header_fail;
1449 }
1450 c->tile_width = bytestream2_get_be32(&bc);
1451 c->tile_height = bytestream2_get_be32(&bc);
1452 if (c->tile_width <= 0 || c->tile_height <= 0 ||
1453 ((c->tile_width | c->tile_height) & 0xF) ||
1454 c->tile_width * (uint64_t)c->tile_height >= INT_MAX / 4
1455 ) {
1456 av_log(avctx, AV_LOG_ERROR,
1457 "Invalid tile dimensions %dx%d\n",
1458 c->tile_width, c->tile_height);
1459 ret = AVERROR_INVALIDDATA;
1460 goto header_fail;
1461 }
1462 c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
1463 c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
1464 c->bpp = bytestream2_get_byte(&bc);
1465 if (c->bpp == 32) {
1466 if (bytestream2_get_bytes_left(&bc) < 16 ||
1467 (chunk_size - 21) < 16) {
1468 av_log(avctx, AV_LOG_ERROR,
1469 "Display info: missing bitmasks!\n");
1470 ret = AVERROR_INVALIDDATA;
1471 goto header_fail;
1472 }
1473 r_mask = bytestream2_get_be32(&bc);
1474 g_mask = bytestream2_get_be32(&bc);
1475 b_mask = bytestream2_get_be32(&bc);
1476 if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
1477 avpriv_report_missing_feature(avctx,
1478 "Bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32,
1479 r_mask, g_mask, b_mask);
1480 ret = AVERROR_PATCHWELCOME;
1481 goto header_fail;
1482 }
1483 } else {
1484 avpriv_request_sample(avctx, "bpp=%d", c->bpp);
1485 ret = AVERROR_PATCHWELCOME;
1486 goto header_fail;
1487 }
1488 if (g2m_init_buffers(c)) {
1489 ret = AVERROR(ENOMEM);
1490 goto header_fail;
1491 }
1492 got_header = 1;
1493 break;
1494 case TILE_DATA:
1495 if (!c->tiles_x || !c->tiles_y) {
1496 av_log(avctx, AV_LOG_WARNING,
1497 "No display info - skipping tile\n");
1498 break;
1499 }
1500 if (chunk_size < 2) {
1501 av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
1502 chunk_size);
1503 break;
1504 }
1505 c->tile_x = bytestream2_get_byte(&bc);
1506 c->tile_y = bytestream2_get_byte(&bc);
1507 if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
1508 av_log(avctx, AV_LOG_ERROR,
1509 "Invalid tile pos %d,%d (in %dx%d grid)\n",
1510 c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
1511 break;
1512 }
1513 ret = 0;
1514 switch (c->compression) {
1515 case COMPR_EPIC_J_B:
1516 ret = epic_jb_decode_tile(c, c->tile_x, c->tile_y,
1517 buf + bytestream2_tell(&bc),
1518 chunk_size - 2, avctx);
1519 break;
1520 case COMPR_KEMPF_J_B:
1521 ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
1522 buf + bytestream2_tell(&bc),
1523 chunk_size - 2);
1524 break;
1525 }
1526 if (ret && c->framebuf)
1527 av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
1528 c->tile_x, c->tile_y);
1529 break;
1530 case CURSOR_POS:
1531 if (chunk_size < 5) {
1532 av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
1533 chunk_size);
1534 break;
1535 }
1536 c->cursor_x = bytestream2_get_be16(&bc);
1537 c->cursor_y = bytestream2_get_be16(&bc);
1538 break;
1539 case CURSOR_SHAPE:
1540 if (chunk_size < 8) {
1541 av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
1542 chunk_size);
1543 break;
1544 }
1545 bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
1546 chunk_size - 4);
1547 g2m_load_cursor(avctx, c, &tbc);
1548 break;
1549 case CHUNK_CC:
1550 case CHUNK_CD:
1551 break;
1552 default:
1553 av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
1554 chunk_type);
1555 }
1556
1557 /* navigate to next chunk */
1558 bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
1559 }
1560 if (got_header)
1561 c->got_header = 1;
1562
1563 if (c->width && c->height && c->framebuf) {
1564 if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
1565 return ret;
1566
1567 pic->key_frame = got_header;
1568 pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
1569
1570 for (i = 0; i < avctx->height; i++)
1571 memcpy(pic->data[0] + i * pic->linesize[0],
1572 c->framebuf + i * c->framebuf_stride,
1573 c->width * 3);
1574 g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
1575
1576 *got_picture_ptr = 1;
1577 }
1578
1579 return buf_size;
1580
1581header_fail:
1582 c->width =
1583 c->height = 0;
1584 c->tiles_x =
1585 c->tiles_y = 0;
1586 c->tile_width =
1587 c->tile_height = 0;
1588 return ret;
1589}
1590
1591static av_cold int g2m_decode_init(AVCodecContext *avctx)
1592{
1593 G2MContext *const c = avctx->priv_data;
1594 int ret;
1595
1596 if ((ret = jpg_init(avctx, &c->jc)) != 0) {
1597 av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
1598 jpg_free_context(&c->jc);
1599 return AVERROR(ENOMEM);
1600 }
1601
1602 avctx->pix_fmt = AV_PIX_FMT_RGB24;
1603
1604 // store original sizes and check against those if resize happens
1605 c->orig_width = avctx->width;
1606 c->orig_height = avctx->height;
1607
1608 return 0;
1609}
1610
1611static av_cold int g2m_decode_end(AVCodecContext *avctx)
1612{
1613 G2MContext *const c = avctx->priv_data;
1614
1615 jpg_free_context(&c->jc);
1616
1617 av_freep(&c->epic_buf_base);
1618 c->epic_buf = NULL;
1619 av_freep(&c->kempf_buf);
1620 av_freep(&c->kempf_flags);
1621 av_freep(&c->synth_tile);
1622 av_freep(&c->jpeg_tile);
1623 av_freep(&c->cursor);
1624 av_freep(&c->framebuf);
1625
1626 return 0;
1627}
1628
1629AVCodec ff_g2m_decoder = {
1630 .name = "g2m",
1631 .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
1632 .type = AVMEDIA_TYPE_VIDEO,
1633 .id = AV_CODEC_ID_G2M,
1634 .priv_data_size = sizeof(G2MContext),
1635 .init = g2m_decode_init,
1636 .close = g2m_decode_end,
1637 .decode = g2m_decode_frame,
1638 .capabilities = AV_CODEC_CAP_DR1,
1639 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
1640};
1641
generated by cgit at 2024-05-17 06:34:01 (GMT)