FFmpeg  3.4.9
g2meet.c
Go to the documentation of this file.
1 /*
2  * Go2Webinar / Go2Meeting decoder
3  * Copyright (c) 2012 Konstantin Shishkov
4  * Copyright (c) 2013 Maxim Poliakovski
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * Go2Webinar / Go2Meeting decoder
26  */
27 
28 #include <inttypes.h>
29 #include <zlib.h>
30 
31 #include "libavutil/imgutils.h"
32 #include "libavutil/intreadwrite.h"
33 
34 #include "avcodec.h"
35 #include "blockdsp.h"
36 #include "bytestream.h"
37 #include "elsdec.h"
38 #include "get_bits.h"
39 #include "idctdsp.h"
40 #include "internal.h"
41 #include "jpegtables.h"
42 #include "mjpeg.h"
43 
44 #define EPIC_PIX_STACK_SIZE 1024
45 #define EPIC_PIX_STACK_MAX (EPIC_PIX_STACK_SIZE - 1)
46 
47 enum ChunkType {
48  DISPLAY_INFO = 0xC8,
54 };
55 
59 };
60 
61 static const uint8_t luma_quant[64] = {
62  8, 6, 5, 8, 12, 20, 26, 31,
63  6, 6, 7, 10, 13, 29, 30, 28,
64  7, 7, 8, 12, 20, 29, 35, 28,
65  7, 9, 11, 15, 26, 44, 40, 31,
66  9, 11, 19, 28, 34, 55, 52, 39,
67  12, 18, 28, 32, 41, 52, 57, 46,
68  25, 32, 39, 44, 52, 61, 60, 51,
69  36, 46, 48, 49, 56, 50, 52, 50
70 };
71 
72 static const uint8_t chroma_quant[64] = {
73  9, 9, 12, 24, 50, 50, 50, 50,
74  9, 11, 13, 33, 50, 50, 50, 50,
75  12, 13, 28, 50, 50, 50, 50, 50,
76  24, 33, 50, 50, 50, 50, 50, 50,
77  50, 50, 50, 50, 50, 50, 50, 50,
78  50, 50, 50, 50, 50, 50, 50, 50,
79  50, 50, 50, 50, 50, 50, 50, 50,
80  50, 50, 50, 50, 50, 50, 50, 50,
81 };
82 
83 typedef struct ePICPixListElem {
85  uint32_t pixel;
88 
89 typedef struct ePICPixHashElem {
90  uint32_t pix_id;
93 
94 #define EPIC_HASH_SIZE 256
95 typedef struct ePICPixHash {
97  int bucket_size[EPIC_HASH_SIZE];
98  int bucket_fill[EPIC_HASH_SIZE];
99 } ePICPixHash;
100 
101 typedef struct ePICContext {
107  uint8_t W_ctx_rung[256];
108  uint8_t N_ctx_rung[512];
109  uint8_t nw_pred_rung[256];
110  uint8_t ne_pred_rung[256];
111  uint8_t prev_row_rung[14];
112  uint8_t runlen_zeroes[14];
115  uint32_t stack[EPIC_PIX_STACK_SIZE];
117 } ePICContext;
118 
119 typedef struct JPGContext {
123 
124  VLC dc_vlc[2], ac_vlc[2];
125  int prev_dc[3];
126  DECLARE_ALIGNED(32, int16_t, block)[6][64];
127 
129 } JPGContext;
130 
131 typedef struct G2MContext {
134 
135  int version;
136 
138  int width, height, bpp;
139  int orig_width, orig_height;
140  int tile_width, tile_height;
141  int tiles_x, tiles_y, tile_x, tile_y;
142 
144 
146  int framebuf_stride, old_width, old_height;
147 
148  uint8_t *synth_tile, *jpeg_tile, *epic_buf, *epic_buf_base;
149  int tile_stride, epic_buf_stride, old_tile_w, old_tile_h;
150  int swapuv;
151 
152  uint8_t *kempf_buf, *kempf_flags;
153 
157  int cursor_w, cursor_h, cursor_x, cursor_y;
158  int cursor_hot_x, cursor_hot_y;
159 } G2MContext;
160 
161 static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table,
162  const uint8_t *val_table, int nb_codes,
163  int is_ac)
164 {
165  uint8_t huff_size[256] = { 0 };
166  uint16_t huff_code[256];
167  uint16_t huff_sym[256];
168  int i;
169 
170  ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
171 
172  for (i = 0; i < 256; i++)
173  huff_sym[i] = i + 16 * is_ac;
174 
175  if (is_ac)
176  huff_sym[0] = 16 * 256;
177 
178  return ff_init_vlc_sparse(vlc, 9, nb_codes, huff_size, 1, 1,
179  huff_code, 2, 2, huff_sym, 2, 2, 0);
180 }
181 
183 {
184  int ret;
185 
187  avpriv_mjpeg_val_dc, 12, 0);
188  if (ret)
189  return ret;
191  avpriv_mjpeg_val_dc, 12, 0);
192  if (ret)
193  return ret;
196  if (ret)
197  return ret;
200  if (ret)
201  return ret;
202 
203  ff_blockdsp_init(&c->bdsp, avctx);
204  ff_idctdsp_init(&c->idsp, avctx);
207 
208  return 0;
209 }
210 
212 {
213  int i;
214 
215  for (i = 0; i < 2; i++) {
216  ff_free_vlc(&ctx->dc_vlc[i]);
217  ff_free_vlc(&ctx->ac_vlc[i]);
218  }
219 
220  av_freep(&ctx->buf);
221 }
222 
223 static void jpg_unescape(const uint8_t *src, int src_size,
224  uint8_t *dst, int *dst_size)
225 {
226  const uint8_t *src_end = src + src_size;
227  uint8_t *dst_start = dst;
228 
229  while (src < src_end) {
230  uint8_t x = *src++;
231 
232  *dst++ = x;
233 
234  if (x == 0xFF && !*src)
235  src++;
236  }
237  *dst_size = dst - dst_start;
238 }
239 
241  int plane, int16_t *block)
242 {
243  int dc, val, pos;
244  const int is_chroma = !!plane;
245  const uint8_t *qmat = is_chroma ? chroma_quant : luma_quant;
246 
247  if (get_bits_left(gb) < 1)
248  return AVERROR_INVALIDDATA;
249 
250  c->bdsp.clear_block(block);
251  dc = get_vlc2(gb, c->dc_vlc[is_chroma].table, 9, 3);
252  if (dc < 0)
253  return AVERROR_INVALIDDATA;
254  if (dc)
255  dc = get_xbits(gb, dc);
256  dc = dc * qmat[0] + c->prev_dc[plane];
257  block[0] = dc;
258  c->prev_dc[plane] = dc;
259 
260  pos = 0;
261  while (pos < 63) {
262  val = get_vlc2(gb, c->ac_vlc[is_chroma].table, 9, 3);
263  if (val < 0)
264  return AVERROR_INVALIDDATA;
265  pos += val >> 4;
266  val &= 0xF;
267  if (pos > 63)
268  return val ? AVERROR_INVALIDDATA : 0;
269  if (val) {
270  int nbits = val;
271 
272  val = get_xbits(gb, nbits);
273  val *= qmat[ff_zigzag_direct[pos]];
274  block[c->scantable.permutated[pos]] = val;
275  }
276  }
277  return 0;
278 }
279 
280 static inline void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
281 {
282  out[ridx] = av_clip_uint8(Y + (91881 * V + 32768 >> 16));
283  out[1] = av_clip_uint8(Y + (-22554 * U - 46802 * V + 32768 >> 16));
284  out[2 - ridx] = av_clip_uint8(Y + (116130 * U + 32768 >> 16));
285 }
286 
287 static int jpg_decode_data(JPGContext *c, int width, int height,
288  const uint8_t *src, int src_size,
289  uint8_t *dst, int dst_stride,
290  const uint8_t *mask, int mask_stride, int num_mbs,
291  int swapuv)
292 {
293  GetBitContext gb;
294  int mb_w, mb_h, mb_x, mb_y, i, j;
295  int bx, by;
296  int unesc_size;
297  int ret;
298  const int ridx = swapuv ? 2 : 0;
299 
300  if ((ret = av_reallocp(&c->buf,
301  src_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0)
302  return ret;
303  jpg_unescape(src, src_size, c->buf, &unesc_size);
304  memset(c->buf + unesc_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
305  if((ret = init_get_bits8(&gb, c->buf, unesc_size)) < 0)
306  return ret;
307 
308  width = FFALIGN(width, 16);
309  mb_w = width >> 4;
310  mb_h = (height + 15) >> 4;
311 
312  if (!num_mbs)
313  num_mbs = mb_w * mb_h * 4;
314 
315  for (i = 0; i < 3; i++)
316  c->prev_dc[i] = 1024;
317  bx =
318  by = 0;
319  c->bdsp.clear_blocks(c->block[0]);
320  for (mb_y = 0; mb_y < mb_h; mb_y++) {
321  for (mb_x = 0; mb_x < mb_w; mb_x++) {
322  if (mask && !mask[mb_x * 2] && !mask[mb_x * 2 + 1] &&
323  !mask[mb_x * 2 + mask_stride] &&
324  !mask[mb_x * 2 + 1 + mask_stride]) {
325  bx += 16;
326  continue;
327  }
328  for (j = 0; j < 2; j++) {
329  for (i = 0; i < 2; i++) {
330  if (mask && !mask[mb_x * 2 + i + j * mask_stride])
331  continue;
332  num_mbs--;
333  if ((ret = jpg_decode_block(c, &gb, 0,
334  c->block[i + j * 2])) != 0)
335  return ret;
336  c->idsp.idct(c->block[i + j * 2]);
337  }
338  }
339  for (i = 1; i < 3; i++) {
340  if ((ret = jpg_decode_block(c, &gb, i, c->block[i + 3])) != 0)
341  return ret;
342  c->idsp.idct(c->block[i + 3]);
343  }
344 
345  for (j = 0; j < 16; j++) {
346  uint8_t *out = dst + bx * 3 + (by + j) * dst_stride;
347  for (i = 0; i < 16; i++) {
348  int Y, U, V;
349 
350  Y = c->block[(j >> 3) * 2 + (i >> 3)][(i & 7) + (j & 7) * 8];
351  U = c->block[4][(i >> 1) + (j >> 1) * 8] - 128;
352  V = c->block[5][(i >> 1) + (j >> 1) * 8] - 128;
353  yuv2rgb(out + i * 3, ridx, Y, U, V);
354  }
355  }
356 
357  if (!num_mbs)
358  return 0;
359  bx += 16;
360  }
361  bx = 0;
362  by += 16;
363  if (mask)
364  mask += mask_stride * 2;
365  }
366 
367  return 0;
368 }
369 
370 #define LOAD_NEIGHBOURS(x) \
371  W = curr_row[(x) - 1]; \
372  N = above_row[(x)]; \
373  WW = curr_row[(x) - 2]; \
374  NW = above_row[(x) - 1]; \
375  NE = above_row[(x) + 1]; \
376  NN = above2_row[(x)]; \
377  NNW = above2_row[(x) - 1]; \
378  NWW = above_row[(x) - 2]; \
379  NNE = above2_row[(x) + 1]
380 
381 #define UPDATE_NEIGHBOURS(x) \
382  NNW = NN; \
383  NN = NNE; \
384  NWW = NW; \
385  NW = N; \
386  N = NE; \
387  NE = above_row[(x) + 1]; \
388  NNE = above2_row[(x) + 1]
389 
390 #define R_shift 16
391 #define G_shift 8
392 #define B_shift 0
393 
394 /* improved djb2 hash from http://www.cse.yorku.ca/~oz/hash.html */
395 static int djb2_hash(uint32_t key)
396 {
397  uint32_t h = 5381;
398 
399  h = (h * 33) ^ ((key >> 24) & 0xFF); // xxx: probably not needed at all
400  h = (h * 33) ^ ((key >> 16) & 0xFF);
401  h = (h * 33) ^ ((key >> 8) & 0xFF);
402  h = (h * 33) ^ (key & 0xFF);
403 
404  return h & (EPIC_HASH_SIZE - 1);
405 }
406 
408 {
409  memset(hash, 0, sizeof(*hash));
410 }
411 
412 static ePICPixHashElem *epic_hash_find(const ePICPixHash *hash, uint32_t key)
413 {
414  int i, idx = djb2_hash(key);
415  ePICPixHashElem *bucket = hash->bucket[idx];
416 
417  for (i = 0; i < hash->bucket_fill[idx]; i++)
418  if (bucket[i].pix_id == key)
419  return &bucket[i];
420 
421  return NULL;
422 }
423 
425 {
426  ePICPixHashElem *bucket, *ret;
427  int idx = djb2_hash(key);
428 
429  if (hash->bucket_size[idx] > INT_MAX / sizeof(**hash->bucket))
430  return NULL;
431 
432  if (!(hash->bucket_fill[idx] < hash->bucket_size[idx])) {
433  int new_size = hash->bucket_size[idx] + 16;
434  bucket = av_realloc(hash->bucket[idx], new_size * sizeof(*bucket));
435  if (!bucket)
436  return NULL;
437  hash->bucket[idx] = bucket;
438  hash->bucket_size[idx] = new_size;
439  }
440 
441  ret = &hash->bucket[idx][hash->bucket_fill[idx]++];
442  memset(ret, 0, sizeof(*ret));
443  ret->pix_id = key;
444  return ret;
445 }
446 
447 static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
448 {
449  ePICPixListElem *new_elem;
450  ePICPixHashElem *hash_elem = epic_hash_find(hash, key);
451 
452  if (!hash_elem) {
453  if (!(hash_elem = epic_hash_add(hash, key)))
454  return AVERROR(ENOMEM);
455  }
456 
457  new_elem = av_mallocz(sizeof(*new_elem));
458  if (!new_elem)
459  return AVERROR(ENOMEM);
460 
461  new_elem->pixel = pix;
462  new_elem->next = hash_elem->list;
463  hash_elem->list = new_elem;
464 
465  return 0;
466 }
467 
469  uint32_t pix)
470 {
471  ePICPixHashElem *hash_elem = epic_hash_find(hash, pix);
472 
473  if (hash_elem != NULL && hash_elem->list != NULL)
474  return 1;
475 
476  return 0;
477 }
478 
480 {
481  int i, j;
482 
483  for (i = 0; i < EPIC_HASH_SIZE; i++) {
484  for (j = 0; j < hash->bucket_fill[i]; j++) {
485  ePICPixListElem *list_elem = hash->bucket[i][j].list;
486  while (list_elem) {
487  ePICPixListElem *tmp = list_elem->next;
488  av_free(list_elem);
489  list_elem = tmp;
490  }
491  }
492  av_freep(&hash->bucket[i]);
493  hash->bucket_size[i] =
494  hash->bucket_fill[i] = 0;
495  }
496 }
497 
498 static inline int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
499 {
500  int i;
501 
502  for (i = 0; i < dc->stack_pos; i++)
503  if (dc->stack[i] == pix)
504  break;
505 
506  return i != dc->stack_pos;
507 }
508 
509 #define TOSIGNED(val) (((val) >> 1) ^ -((val) & 1))
510 
512  int N, int W, int NW)
513 {
514  unsigned delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
515  return mid_pred(N, N + W - NW, W) - TOSIGNED(delta);
516 }
517 
518 static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y,
519  const uint32_t *curr_row,
520  const uint32_t *above_row)
521 {
522  uint32_t N, W, NW, pred;
523  unsigned delta;
524  int GN, GW, GNW, R, G, B;
525 
526  if (x && y) {
527  W = curr_row[x - 1];
528  N = above_row[x];
529  NW = above_row[x - 1];
530 
531  GN = (N >> G_shift) & 0xFF;
532  GW = (W >> G_shift) & 0xFF;
533  GNW = (NW >> G_shift) & 0xFF;
534 
535  G = epic_decode_component_pred(dc, GN, GW, GNW);
536 
537  R = G + epic_decode_component_pred(dc,
538  ((N >> R_shift) & 0xFF) - GN,
539  ((W >> R_shift) & 0xFF) - GW,
540  ((NW >> R_shift) & 0xFF) - GNW);
541 
542  B = G + epic_decode_component_pred(dc,
543  ((N >> B_shift) & 0xFF) - GN,
544  ((W >> B_shift) & 0xFF) - GW,
545  ((NW >> B_shift) & 0xFF) - GNW);
546  } else {
547  if (x)
548  pred = curr_row[x - 1];
549  else
550  pred = above_row[x];
551 
552  delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
553  R = ((pred >> R_shift) & 0xFF) - TOSIGNED(delta);
554 
555  delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
556  G = ((pred >> G_shift) & 0xFF) - TOSIGNED(delta);
557 
558  delta = ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung);
559  B = ((pred >> B_shift) & 0xFF) - TOSIGNED(delta);
560  }
561 
562  if (R<0 || G<0 || B<0 || R > 255 || G > 255 || B > 255) {
563  avpriv_request_sample(NULL, "RGB %d %d %d is out of range\n", R, G, B);
564  return 0;
565  }
566 
567  return (R << R_shift) | (G << G_shift) | (B << B_shift);
568 }
569 
571  uint32_t *pPix, uint32_t pix)
572 {
573  if (!ff_els_decode_bit(&dc->els_ctx, rung)) {
574  *pPix = pix;
575  return 1;
576  }
577  dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
578  return 0;
579 }
580 
581 static int epic_handle_edges(ePICContext *dc, int x, int y,
582  const uint32_t *curr_row,
583  const uint32_t *above_row, uint32_t *pPix)
584 {
585  uint32_t pix;
586 
587  if (!x && !y) { /* special case: top-left pixel */
588  /* the top-left pixel is coded independently with 3 unsigned numbers */
589  *pPix = (ff_els_decode_unsigned(&dc->els_ctx, &dc->unsigned_rung) << R_shift) |
592  return 1;
593  }
594 
595  if (x) { /* predict from W first */
596  pix = curr_row[x - 1];
597  if (epic_predict_pixel(dc, &dc->W_flag_rung, pPix, pix))
598  return 1;
599  }
600 
601  if (y) { /* then try to predict from N */
602  pix = above_row[x];
603  if (!dc->stack_pos || dc->stack[0] != pix) {
604  if (epic_predict_pixel(dc, &dc->N_flag_rung, pPix, pix))
605  return 1;
606  }
607  }
608 
609  return 0;
610 }
611 
612 static int epic_decode_run_length(ePICContext *dc, int x, int y, int tile_width,
613  const uint32_t *curr_row,
614  const uint32_t *above_row,
615  const uint32_t *above2_row,
616  uint32_t *pPix, int *pRun)
617 {
618  int idx, got_pixel = 0, WWneW, old_WWneW = 0;
619  uint32_t W, WW, N, NN, NW, NE, NWW, NNW, NNE;
620 
621  *pRun = 0;
622 
623  LOAD_NEIGHBOURS(x);
624 
625  if (dc->next_run_pos == x) {
626  /* can't reuse W for the new pixel in this case */
627  WWneW = 1;
628  } else {
629  idx = (WW != W) << 7 |
630  (NW != W) << 6 |
631  (N != NE) << 5 |
632  (NW != N) << 4 |
633  (NWW != NW) << 3 |
634  (NNE != NE) << 2 |
635  (NN != N) << 1 |
636  (NNW != NW);
637  WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
638  if (WWneW < 0)
639  return WWneW;
640  }
641 
642  if (WWneW)
643  dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = W;
644  else {
645  *pPix = W;
646  got_pixel = 1;
647  }
648 
649  do {
650  int NWneW = 1;
651  if (got_pixel) // pixel value already known (derived from either W or N)
652  NWneW = *pPix != N;
653  else { // pixel value is unknown and will be decoded later
654  NWneW = *pRun ? NWneW : NW != W;
655 
656  /* TODO: RFC this mess! */
657  switch (((NW != N) << 2) | (NWneW << 1) | WWneW) {
658  case 0:
659  break; // do nothing here
660  case 3:
661  case 5:
662  case 6:
663  case 7:
664  if (!is_pixel_on_stack(dc, N)) {
665  idx = WWneW << 8 |
666  (*pRun ? old_WWneW : WW != W) << 7 |
667  NWneW << 6 |
668  (N != NE) << 5 |
669  (NW != N) << 4 |
670  (NWW != NW) << 3 |
671  (NNE != NE) << 2 |
672  (NN != N) << 1 |
673  (NNW != NW);
674  if (!ff_els_decode_bit(&dc->els_ctx, &dc->N_ctx_rung[idx])) {
675  NWneW = 0;
676  *pPix = N;
677  got_pixel = 1;
678  break;
679  }
680  }
681  /* fall through */
682  default:
683  NWneW = 1;
684  old_WWneW = WWneW;
685  if (!is_pixel_on_stack(dc, N))
686  dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = N;
687  }
688  }
689 
690  (*pRun)++;
691  if (x + *pRun >= tile_width - 1)
692  break;
693 
694  UPDATE_NEIGHBOURS(x + *pRun);
695 
696  if (!NWneW && NW == N && N == NE) {
697  int pos, run, rle;
698  int start_pos = x + *pRun;
699 
700  /* scan for a run of pix in the line above */
701  uint32_t pix = above_row[start_pos + 1];
702  for (pos = start_pos + 2; pos < tile_width; pos++)
703  if (!(above_row[pos] == pix))
704  break;
705  run = pos - start_pos - 1;
706  idx = av_ceil_log2(run);
707  if (ff_els_decode_bit(&dc->els_ctx, &dc->prev_row_rung[idx]))
708  *pRun += run;
709  else {
710  int flag;
711  /* run-length is coded as plain binary number of idx - 1 bits */
712  for (pos = idx - 1, rle = 0, flag = 0; pos >= 0; pos--) {
713  if ((1 << pos) + rle < run &&
715  flag ? &dc->runlen_one
716  : &dc->runlen_zeroes[pos])) {
717  flag = 1;
718  rle |= 1 << pos;
719  }
720  }
721  *pRun += rle;
722  break; // return immediately
723  }
724  if (x + *pRun >= tile_width - 1)
725  break;
726 
727  LOAD_NEIGHBOURS(x + *pRun);
728  WWneW = 0;
729  NWneW = 0;
730  }
731 
732  idx = WWneW << 7 |
733  NWneW << 6 |
734  (N != NE) << 5 |
735  (NW != N) << 4 |
736  (NWW != NW) << 3 |
737  (NNE != NE) << 2 |
738  (NN != N) << 1 |
739  (NNW != NW);
740  WWneW = ff_els_decode_bit(&dc->els_ctx, &dc->W_ctx_rung[idx]);
741  } while (!WWneW);
742 
743  dc->next_run_pos = x + *pRun;
744  return got_pixel;
745 }
746 
748  uint32_t *pPix, uint32_t pix)
749 {
750  if (ff_els_decode_bit(&dc->els_ctx, rung)) {
751  *pPix = pix;
752  return 1;
753  }
754  dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = pix;
755  return 0;
756 }
757 
758 static int epic_predict_from_NW_NE(ePICContext *dc, int x, int y, int run,
759  int tile_width, const uint32_t *curr_row,
760  const uint32_t *above_row, uint32_t *pPix)
761 {
762  int pos;
763 
764  /* try to reuse the NW pixel first */
765  if (x && y) {
766  uint32_t NW = above_row[x - 1];
767  if (NW != curr_row[x - 1] && NW != above_row[x] && !is_pixel_on_stack(dc, NW)) {
768  if (epic_predict_pixel2(dc, &dc->nw_pred_rung[NW & 0xFF], pPix, NW))
769  return 1;
770  }
771  }
772 
773  /* try to reuse the NE[x + run, y] pixel */
774  pos = x + run - 1;
775  if (pos < tile_width - 1 && y) {
776  uint32_t NE = above_row[pos + 1];
777  if (NE != above_row[pos] && !is_pixel_on_stack(dc, NE)) {
778  if (epic_predict_pixel2(dc, &dc->ne_pred_rung[NE & 0xFF], pPix, NE))
779  return 1;
780  }
781  }
782 
783  return 0;
784 }
785 
786 static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix)
787 {
788  ePICPixListElem *list, *prev = NULL;
789  ePICPixHashElem *hash_elem = epic_hash_find(&dc->hash, W);
790 
791  if (!hash_elem || !hash_elem->list)
792  return 0;
793 
794  list = hash_elem->list;
795  while (list) {
796  if (!is_pixel_on_stack(dc, list->pixel)) {
797  if (ff_els_decode_bit(&dc->els_ctx, &list->rung)) {
798  *pPix = list->pixel;
799  if (list != hash_elem->list) {
800  prev->next = list->next;
801  list->next = hash_elem->list;
802  hash_elem->list = list;
803  }
804  return 1;
805  }
806  dc->stack[dc->stack_pos++ & EPIC_PIX_STACK_MAX] = list->pixel;
807  }
808  prev = list;
809  list = list->next;
810  }
811 
812  return 0;
813 }
814 
815 static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height,
816  int tile_width, int stride)
817 {
818  int x, y;
819  uint32_t pix;
820  uint32_t *curr_row = NULL, *above_row = NULL, *above2_row;
821 
822  for (y = 0; y < tile_height; y++, out += stride) {
823  above2_row = above_row;
824  above_row = curr_row;
825  curr_row = (uint32_t *) out;
826 
827  for (x = 0, dc->next_run_pos = 0; x < tile_width;) {
828  if (dc->els_ctx.err)
829  return AVERROR_INVALIDDATA; // bail out in the case of ELS overflow
830 
831  pix = curr_row[x - 1]; // get W pixel
832 
833  if (y >= 1 && x >= 2 &&
834  pix != curr_row[x - 2] && pix != above_row[x - 1] &&
835  pix != above_row[x - 2] && pix != above_row[x] &&
836  !epic_cache_entries_for_pixel(&dc->hash, pix)) {
837  curr_row[x] = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
838  x++;
839  } else {
840  int got_pixel, run;
841  dc->stack_pos = 0; // empty stack
842 
843  if (y < 2 || x < 2 || x == tile_width - 1) {
844  run = 1;
845  got_pixel = epic_handle_edges(dc, x, y, curr_row, above_row, &pix);
846  } else {
847  got_pixel = epic_decode_run_length(dc, x, y, tile_width,
848  curr_row, above_row,
849  above2_row, &pix, &run);
850  if (got_pixel < 0)
851  return got_pixel;
852  }
853 
854  if (!got_pixel && !epic_predict_from_NW_NE(dc, x, y, run,
855  tile_width, curr_row,
856  above_row, &pix)) {
857  uint32_t ref_pix = curr_row[x - 1];
858  if (!x || !epic_decode_from_cache(dc, ref_pix, &pix)) {
859  pix = epic_decode_pixel_pred(dc, x, y, curr_row, above_row);
860  if (is_pixel_on_stack(dc, pix))
861  return AVERROR_INVALIDDATA;
862 
863  if (x) {
864  int ret = epic_add_pixel_to_cache(&dc->hash,
865  ref_pix,
866  pix);
867  if (ret)
868  return ret;
869  }
870  }
871  }
872  for (; run > 0; x++, run--)
873  curr_row[x] = pix;
874  }
875  }
876  }
877 
878  return 0;
879 }
880 
881 static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y,
882  const uint8_t *src, size_t src_size,
883  AVCodecContext *avctx)
884 {
885  uint8_t prefix, mask = 0x80;
886  int extrabytes, tile_width, tile_height, awidth, aheight;
887  size_t els_dsize;
888  uint8_t *dst;
889 
890  if (!src_size)
891  return 0;
892 
893  /* get data size of the ELS partition as unsigned variable-length integer */
894  prefix = *src++;
895  src_size--;
896  for (extrabytes = 0; (prefix & mask) && (extrabytes < 7); extrabytes++)
897  mask >>= 1;
898  if (extrabytes > 3 || src_size < extrabytes) {
899  av_log(avctx, AV_LOG_ERROR, "ePIC: invalid data size VLI\n");
900  return AVERROR_INVALIDDATA;
901  }
902 
903  els_dsize = prefix & ((0x80 >> extrabytes) - 1); // mask out the length prefix
904  while (extrabytes-- > 0) {
905  els_dsize = (els_dsize << 8) | *src++;
906  src_size--;
907  }
908 
909  if (src_size < els_dsize) {
910  av_log(avctx, AV_LOG_ERROR, "ePIC: data too short, needed %"SIZE_SPECIFIER", got %"SIZE_SPECIFIER"\n",
911  els_dsize, src_size);
912  return AVERROR_INVALIDDATA;
913  }
914 
915  tile_width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
916  tile_height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
917  awidth = FFALIGN(tile_width, 16);
918  aheight = FFALIGN(tile_height, 16);
919 
920  if (tile_width > (1 << FF_ARRAY_ELEMS(c->ec.prev_row_rung))) {
921  avpriv_request_sample(avctx, "large tile width");
922  return AVERROR_INVALIDDATA;
923  }
924 
925  if (els_dsize) {
926  int ret, i, j, k;
927  uint8_t tr_r, tr_g, tr_b, *buf;
928  uint32_t *in;
929  /* ELS decoder initializations */
930  memset(&c->ec, 0, sizeof(c->ec));
931  ff_els_decoder_init(&c->ec.els_ctx, src, els_dsize);
932  epic_hash_init(&c->ec.hash);
933 
934  /* decode transparent pixel value */
938  if (c->ec.els_ctx.err != 0) {
939  av_log(avctx, AV_LOG_ERROR,
940  "ePIC: couldn't decode transparency pixel!\n");
942  return AVERROR_INVALIDDATA;
943  }
944 
945  ret = epic_decode_tile(&c->ec, c->epic_buf, tile_height, tile_width,
946  c->epic_buf_stride);
947 
950 
951  if (ret) {
952  av_log(avctx, AV_LOG_ERROR,
953  "ePIC: tile decoding failed, frame=%d, tile_x=%d, tile_y=%d\n",
954  avctx->frame_number, tile_x, tile_y);
955  return AVERROR_INVALIDDATA;
956  }
957 
958  buf = c->epic_buf;
959  dst = c->framebuf + tile_x * c->tile_width * 3 +
960  tile_y * c->tile_height * c->framebuf_stride;
961 
962  for (j = 0; j < tile_height; j++) {
963  uint8_t *out = dst;
964  in = (uint32_t *) buf;
965  for (i = 0; i < tile_width; i++) {
966  out[0] = (in[i] >> R_shift) & 0xFF;
967  out[1] = (in[i] >> G_shift) & 0xFF;
968  out[2] = (in[i] >> B_shift) & 0xFF;
969  out += 3;
970  }
971  buf += c->epic_buf_stride;
972  dst += c->framebuf_stride;
973  }
974 
975  if (src_size > els_dsize) {
976  uint8_t *jpg;
977  uint32_t tr;
978  int bstride = FFALIGN(tile_width, 16) >> 3;
979  int nblocks = 0;
980  int estride = c->epic_buf_stride >> 2;
981 
982  src += els_dsize;
983  src_size -= els_dsize;
984 
985  in = (uint32_t *) c->epic_buf;
986  tr = (tr_r << R_shift) | (tr_g << G_shift) | (tr_b << B_shift);
987 
988  memset(c->kempf_flags, 0,
989  (aheight >> 3) * bstride * sizeof(*c->kempf_flags));
990  for (j = 0; j < tile_height; j += 8) {
991  for (i = 0; i < tile_width; i += 8) {
992  c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 0;
993  for (k = 0; k < 8 * 8; k++) {
994  if (in[i + (k & 7) + (k >> 3) * estride] == tr) {
995  c->kempf_flags[(i >> 3) + (j >> 3) * bstride] = 1;
996  nblocks++;
997  break;
998  }
999  }
1000  }
1001  in += 8 * estride;
1002  }
1003 
1004  memset(c->jpeg_tile, 0, c->tile_stride * aheight);
1005  jpg_decode_data(&c->jc, awidth, aheight, src, src_size,
1006  c->jpeg_tile, c->tile_stride,
1007  c->kempf_flags, bstride, nblocks, c->swapuv);
1008 
1009  in = (uint32_t *) c->epic_buf;
1010  dst = c->framebuf + tile_x * c->tile_width * 3 +
1011  tile_y * c->tile_height * c->framebuf_stride;
1012  jpg = c->jpeg_tile;
1013  for (j = 0; j < tile_height; j++) {
1014  for (i = 0; i < tile_width; i++)
1015  if (in[i] == tr)
1016  memcpy(dst + i * 3, jpg + i * 3, 3);
1017  in += c->epic_buf_stride >> 2;
1018  dst += c->framebuf_stride;
1019  jpg += c->tile_stride;
1020  }
1021  }
1022  } else {
1023  dst = c->framebuf + tile_x * c->tile_width * 3 +
1024  tile_y * c->tile_height * c->framebuf_stride;
1025  return jpg_decode_data(&c->jc, tile_width, tile_height, src, src_size,
1026  dst, c->framebuf_stride, NULL, 0, 0, c->swapuv);
1027  }
1028 
1029  return 0;
1030 }
1031 
1032 static int kempf_restore_buf(const uint8_t *src, int len,
1033  uint8_t *dst, int stride,
1034  const uint8_t *jpeg_tile, int tile_stride,
1035  int width, int height,
1036  const uint8_t *pal, int npal, int tidx)
1037 {
1038  GetBitContext gb;
1039  int i, j, nb, col;
1040  int ret;
1041  int align_width = FFALIGN(width, 16);
1042 
1043  if ((ret = init_get_bits8(&gb, src, len)) < 0)
1044  return ret;
1045 
1046  if (npal <= 2) nb = 1;
1047  else if (npal <= 4) nb = 2;
1048  else if (npal <= 16) nb = 4;
1049  else nb = 8;
1050 
1051  for (j = 0; j < height; j++, dst += stride, jpeg_tile += tile_stride) {
1052  if (get_bits(&gb, 8))
1053  continue;
1054  for (i = 0; i < width; i++) {
1055  col = get_bits(&gb, nb);
1056  if (col != tidx)
1057  memcpy(dst + i * 3, pal + col * 3, 3);
1058  else
1059  memcpy(dst + i * 3, jpeg_tile + i * 3, 3);
1060  }
1061  skip_bits_long(&gb, nb * (align_width - width));
1062  }
1063 
1064  return 0;
1065 }
1066 
1067 static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
1068  const uint8_t *src, int src_size)
1069 {
1070  int width, height;
1071  int hdr, zsize, npal, tidx = -1, ret;
1072  int i, j;
1073  const uint8_t *src_end = src + src_size;
1074  uint8_t pal[768], transp[3];
1075  uLongf dlen = (c->tile_width + 1) * c->tile_height;
1076  int sub_type;
1077  int nblocks, cblocks, bstride;
1078  int bits, bitbuf, coded;
1079  uint8_t *dst = c->framebuf + tile_x * c->tile_width * 3 +
1080  tile_y * c->tile_height * c->framebuf_stride;
1081 
1082  if (src_size < 2)
1083  return AVERROR_INVALIDDATA;
1084 
1085  width = FFMIN(c->width - tile_x * c->tile_width, c->tile_width);
1086  height = FFMIN(c->height - tile_y * c->tile_height, c->tile_height);
1087 
1088  hdr = *src++;
1089  sub_type = hdr >> 5;
1090  if (sub_type == 0) {
1091  int j;
1092  memcpy(transp, src, 3);
1093  src += 3;
1094  for (j = 0; j < height; j++, dst += c->framebuf_stride)
1095  for (i = 0; i < width; i++)
1096  memcpy(dst + i * 3, transp, 3);
1097  return 0;
1098  } else if (sub_type == 1) {
1099  return jpg_decode_data(&c->jc, width, height, src, src_end - src,
1100  dst, c->framebuf_stride, NULL, 0, 0, 0);
1101  }
1102 
1103  if (sub_type != 2) {
1104  memcpy(transp, src, 3);
1105  src += 3;
1106  }
1107  npal = *src++ + 1;
1108  if (src_end - src < npal * 3)
1109  return AVERROR_INVALIDDATA;
1110  memcpy(pal, src, npal * 3);
1111  src += npal * 3;
1112  if (sub_type != 2) {
1113  for (i = 0; i < npal; i++) {
1114  if (!memcmp(pal + i * 3, transp, 3)) {
1115  tidx = i;
1116  break;
1117  }
1118  }
1119  }
1120 
1121  if (src_end - src < 2)
1122  return 0;
1123  zsize = (src[0] << 8) | src[1];
1124  src += 2;
1125 
1126  if (src_end - src < zsize + (sub_type != 2))
1127  return AVERROR_INVALIDDATA;
1128 
1129  ret = uncompress(c->kempf_buf, &dlen, src, zsize);
1130  if (ret)
1131  return AVERROR_INVALIDDATA;
1132  src += zsize;
1133 
1134  if (sub_type == 2) {
1135  kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1136  NULL, 0, width, height, pal, npal, tidx);
1137  return 0;
1138  }
1139 
1140  nblocks = *src++ + 1;
1141  cblocks = 0;
1142  bstride = FFALIGN(width, 16) >> 3;
1143  // blocks are coded LSB and we need normal bitreader for JPEG data
1144  bits = 0;
1145  for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
1146  for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
1147  if (!bits) {
1148  if (src >= src_end)
1149  return AVERROR_INVALIDDATA;
1150  bitbuf = *src++;
1151  bits = 8;
1152  }
1153  coded = bitbuf & 1;
1154  bits--;
1155  bitbuf >>= 1;
1156  cblocks += coded;
1157  if (cblocks > nblocks)
1158  return AVERROR_INVALIDDATA;
1159  c->kempf_flags[j * 2 + i * 2 * bstride] =
1160  c->kempf_flags[j * 2 + 1 + i * 2 * bstride] =
1161  c->kempf_flags[j * 2 + (i * 2 + 1) * bstride] =
1162  c->kempf_flags[j * 2 + 1 + (i * 2 + 1) * bstride] = coded;
1163  }
1164  }
1165 
1166  memset(c->jpeg_tile, 0, c->tile_stride * height);
1167  jpg_decode_data(&c->jc, width, height, src, src_end - src,
1168  c->jpeg_tile, c->tile_stride,
1169  c->kempf_flags, bstride, nblocks * 4, 0);
1170 
1171  kempf_restore_buf(c->kempf_buf, dlen, dst, c->framebuf_stride,
1172  c->jpeg_tile, c->tile_stride,
1173  width, height, pal, npal, tidx);
1174 
1175  return 0;
1176 }
1177 
1179 {
1180  int aligned_height;
1181 
1182  if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
1183  c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
1184  aligned_height = c->height + 15;
1185  av_free(c->framebuf);
1186  c->framebuf = av_mallocz_array(c->framebuf_stride, aligned_height);
1187  if (!c->framebuf)
1188  return AVERROR(ENOMEM);
1189  }
1190  if (!c->synth_tile || !c->jpeg_tile ||
1191  (c->compression == 2 && !c->epic_buf_base) ||
1192  c->old_tile_w < c->tile_width ||
1193  c->old_tile_h < c->tile_height) {
1194  c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
1195  c->epic_buf_stride = FFALIGN(c->tile_width * 4, 16);
1196  aligned_height = FFALIGN(c->tile_height, 16);
1197  av_freep(&c->synth_tile);
1198  av_freep(&c->jpeg_tile);
1199  av_freep(&c->kempf_buf);
1200  av_freep(&c->kempf_flags);
1201  av_freep(&c->epic_buf_base);
1202  c->epic_buf = NULL;
1203  c->synth_tile = av_mallocz(c->tile_stride * aligned_height);
1204  c->jpeg_tile = av_mallocz(c->tile_stride * aligned_height);
1205  c->kempf_buf = av_mallocz((c->tile_width + 1) * aligned_height +
1207  c->kempf_flags = av_mallocz(c->tile_width * aligned_height);
1208  if (!c->synth_tile || !c->jpeg_tile ||
1209  !c->kempf_buf || !c->kempf_flags)
1210  return AVERROR(ENOMEM);
1211  if (c->compression == 2) {
1212  c->epic_buf_base = av_mallocz(c->epic_buf_stride * aligned_height + 4);
1213  if (!c->epic_buf_base)
1214  return AVERROR(ENOMEM);
1215  c->epic_buf = c->epic_buf_base + 4;
1216  }
1217  }
1218 
1219  return 0;
1220 }
1221 
1223  GetByteContext *gb)
1224 {
1225  int i, j, k;
1226  uint8_t *dst;
1227  uint32_t bits;
1228  uint32_t cur_size, cursor_w, cursor_h, cursor_stride;
1229  uint32_t cursor_hot_x, cursor_hot_y;
1230  int cursor_fmt, err;
1231 
1232  cur_size = bytestream2_get_be32(gb);
1233  cursor_w = bytestream2_get_byte(gb);
1234  cursor_h = bytestream2_get_byte(gb);
1235  cursor_hot_x = bytestream2_get_byte(gb);
1236  cursor_hot_y = bytestream2_get_byte(gb);
1237  cursor_fmt = bytestream2_get_byte(gb);
1238 
1239  cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
1240 
1241  if (cursor_w < 1 || cursor_w > 256 ||
1242  cursor_h < 1 || cursor_h > 256) {
1243  av_log(avctx, AV_LOG_ERROR, "Invalid cursor dimensions %"PRIu32"x%"PRIu32"\n",
1244  cursor_w, cursor_h);
1245  return AVERROR_INVALIDDATA;
1246  }
1247  if (cursor_hot_x > cursor_w || cursor_hot_y > cursor_h) {
1248  av_log(avctx, AV_LOG_WARNING, "Invalid hotspot position %"PRIu32",%"PRIu32"\n",
1249  cursor_hot_x, cursor_hot_y);
1250  cursor_hot_x = FFMIN(cursor_hot_x, cursor_w - 1);
1251  cursor_hot_y = FFMIN(cursor_hot_y, cursor_h - 1);
1252  }
1253  if (cur_size - 9 > bytestream2_get_bytes_left(gb) ||
1254  c->cursor_w * c->cursor_h / 4 > cur_size) {
1255  av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"/%u\n",
1256  cur_size, bytestream2_get_bytes_left(gb));
1257  return AVERROR_INVALIDDATA;
1258  }
1259  if (cursor_fmt != 1 && cursor_fmt != 32) {
1260  avpriv_report_missing_feature(avctx, "Cursor format %d",
1261  cursor_fmt);
1262  return AVERROR_PATCHWELCOME;
1263  }
1264 
1265  if ((err = av_reallocp(&c->cursor, cursor_stride * cursor_h)) < 0) {
1266  av_log(avctx, AV_LOG_ERROR, "Cannot allocate cursor buffer\n");
1267  return err;
1268  }
1269 
1270  c->cursor_w = cursor_w;
1271  c->cursor_h = cursor_h;
1272  c->cursor_hot_x = cursor_hot_x;
1273  c->cursor_hot_y = cursor_hot_y;
1274  c->cursor_fmt = cursor_fmt;
1275  c->cursor_stride = cursor_stride;
1276 
1277  dst = c->cursor;
1278  switch (c->cursor_fmt) {
1279  case 1: // old monochrome
1280  for (j = 0; j < c->cursor_h; j++) {
1281  for (i = 0; i < c->cursor_w; i += 32) {
1282  bits = bytestream2_get_be32(gb);
1283  for (k = 0; k < 32; k++) {
1284  dst[0] = !!(bits & 0x80000000);
1285  dst += 4;
1286  bits <<= 1;
1287  }
1288  }
1289  }
1290 
1291  dst = c->cursor;
1292  for (j = 0; j < c->cursor_h; j++) {
1293  for (i = 0; i < c->cursor_w; i += 32) {
1294  bits = bytestream2_get_be32(gb);
1295  for (k = 0; k < 32; k++) {
1296  int mask_bit = !!(bits & 0x80000000);
1297  switch (dst[0] * 2 + mask_bit) {
1298  case 0:
1299  dst[0] = 0xFF;
1300  dst[1] = 0x00;
1301  dst[2] = 0x00;
1302  dst[3] = 0x00;
1303  break;
1304  case 1:
1305  dst[0] = 0xFF;
1306  dst[1] = 0xFF;
1307  dst[2] = 0xFF;
1308  dst[3] = 0xFF;
1309  break;
1310  default:
1311  dst[0] = 0x00;
1312  dst[1] = 0x00;
1313  dst[2] = 0x00;
1314  dst[3] = 0x00;
1315  }
1316  dst += 4;
1317  bits <<= 1;
1318  }
1319  }
1320  }
1321  break;
1322  case 32: // full colour
1323  /* skip monochrome version of the cursor and decode RGBA instead */
1324  bytestream2_skip(gb, c->cursor_h * (FFALIGN(c->cursor_w, 32) >> 3));
1325  for (j = 0; j < c->cursor_h; j++) {
1326  for (i = 0; i < c->cursor_w; i++) {
1327  int val = bytestream2_get_be32(gb);
1328  *dst++ = val >> 0;
1329  *dst++ = val >> 8;
1330  *dst++ = val >> 16;
1331  *dst++ = val >> 24;
1332  }
1333  }
1334  break;
1335  default:
1336  return AVERROR_PATCHWELCOME;
1337  }
1338  return 0;
1339 }
1340 
1341 #define APPLY_ALPHA(src, new, alpha) \
1342  src = (src * (256 - alpha) + new * alpha) >> 8
1343 
1344 static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
1345 {
1346  int i, j;
1347  int x, y, w, h;
1348  const uint8_t *cursor;
1349 
1350  if (!c->cursor)
1351  return;
1352 
1353  x = c->cursor_x - c->cursor_hot_x;
1354  y = c->cursor_y - c->cursor_hot_y;
1355 
1356  cursor = c->cursor;
1357  w = c->cursor_w;
1358  h = c->cursor_h;
1359 
1360  if (x + w > c->width)
1361  w = c->width - x;
1362  if (y + h > c->height)
1363  h = c->height - y;
1364  if (x < 0) {
1365  w += x;
1366  cursor += -x * 4;
1367  } else {
1368  dst += x * 3;
1369  }
1370 
1371  if (y < 0)
1372  h += y;
1373  if (w < 0 || h < 0)
1374  return;
1375  if (y < 0) {
1376  cursor += -y * c->cursor_stride;
1377  } else {
1378  dst += y * stride;
1379  }
1380 
1381  for (j = 0; j < h; j++) {
1382  for (i = 0; i < w; i++) {
1383  uint8_t alpha = cursor[i * 4];
1384  APPLY_ALPHA(dst[i * 3 + 0], cursor[i * 4 + 1], alpha);
1385  APPLY_ALPHA(dst[i * 3 + 1], cursor[i * 4 + 2], alpha);
1386  APPLY_ALPHA(dst[i * 3 + 2], cursor[i * 4 + 3], alpha);
1387  }
1388  dst += stride;
1389  cursor += c->cursor_stride;
1390  }
1391 }
1392 
1393 static int g2m_decode_frame(AVCodecContext *avctx, void *data,
1394  int *got_picture_ptr, AVPacket *avpkt)
1395 {
1396  const uint8_t *buf = avpkt->data;
1397  int buf_size = avpkt->size;
1398  G2MContext *c = avctx->priv_data;
1399  AVFrame *pic = data;
1400  GetByteContext bc, tbc;
1401  int magic;
1402  int got_header = 0;
1403  uint32_t chunk_size, r_mask, g_mask, b_mask;
1404  int chunk_type, chunk_start;
1405  int i;
1406  int ret;
1407 
1408  if (buf_size < 12) {
1409  av_log(avctx, AV_LOG_ERROR,
1410  "Frame should have at least 12 bytes, got %d instead\n",
1411  buf_size);
1412  return AVERROR_INVALIDDATA;
1413  }
1414 
1415  bytestream2_init(&bc, buf, buf_size);
1416 
1417  magic = bytestream2_get_be32(&bc);
1418  if ((magic & ~0xF) != MKBETAG('G', '2', 'M', '0') ||
1419  (magic & 0xF) < 2 || (magic & 0xF) > 5) {
1420  av_log(avctx, AV_LOG_ERROR, "Wrong magic %08X\n", magic);
1421  return AVERROR_INVALIDDATA;
1422  }
1423 
1424  c->swapuv = magic == MKBETAG('G', '2', 'M', '2');
1425 
1426  while (bytestream2_get_bytes_left(&bc) > 5) {
1427  chunk_size = bytestream2_get_le32(&bc) - 1;
1428  chunk_type = bytestream2_get_byte(&bc);
1429  chunk_start = bytestream2_tell(&bc);
1430  if (chunk_size > bytestream2_get_bytes_left(&bc)) {
1431  av_log(avctx, AV_LOG_ERROR, "Invalid chunk size %"PRIu32" type %02X\n",
1432  chunk_size, chunk_type);
1433  break;
1434  }
1435  switch (chunk_type) {
1436  case DISPLAY_INFO:
1437  got_header =
1438  c->got_header = 0;
1439  if (chunk_size < 21) {
1440  av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
1441  chunk_size);
1442  break;
1443  }
1444  c->width = bytestream2_get_be32(&bc);
1445  c->height = bytestream2_get_be32(&bc);
1446  if (c->width < 16 || c->height < 16) {
1447  av_log(avctx, AV_LOG_ERROR,
1448  "Invalid frame dimensions %dx%d\n",
1449  c->width, c->height);
1450  ret = AVERROR_INVALIDDATA;
1451  goto header_fail;
1452  }
1453  if (c->width != avctx->width || c->height != avctx->height) {
1454  ret = ff_set_dimensions(avctx, c->width, c->height);
1455  if (ret < 0)
1456  goto header_fail;
1457  }
1458  c->compression = bytestream2_get_be32(&bc);
1459  if (c->compression != 2 && c->compression != 3) {
1460  avpriv_report_missing_feature(avctx, "Compression method %d",
1461  c->compression);
1462  ret = AVERROR_PATCHWELCOME;
1463  goto header_fail;
1464  }
1465  c->tile_width = bytestream2_get_be32(&bc);
1466  c->tile_height = bytestream2_get_be32(&bc);
1467  if (c->tile_width <= 0 || c->tile_height <= 0 ||
1468  ((c->tile_width | c->tile_height) & 0xF) ||
1469  c->tile_width * (uint64_t)c->tile_height >= INT_MAX / 4 ||
1470  av_image_check_size2(c->tile_width, c->tile_height, avctx->max_pixels, avctx->pix_fmt, 0, avctx) < 0
1471  ) {
1472  av_log(avctx, AV_LOG_ERROR,
1473  "Invalid tile dimensions %dx%d\n",
1474  c->tile_width, c->tile_height);
1475  ret = AVERROR_INVALIDDATA;
1476  goto header_fail;
1477  }
1478  c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
1479  c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
1480  c->bpp = bytestream2_get_byte(&bc);
1481  if (c->bpp == 32) {
1482  if (bytestream2_get_bytes_left(&bc) < 16 ||
1483  (chunk_size - 21) < 16) {
1484  av_log(avctx, AV_LOG_ERROR,
1485  "Display info: missing bitmasks!\n");
1486  ret = AVERROR_INVALIDDATA;
1487  goto header_fail;
1488  }
1489  r_mask = bytestream2_get_be32(&bc);
1490  g_mask = bytestream2_get_be32(&bc);
1491  b_mask = bytestream2_get_be32(&bc);
1492  if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
1494  "Bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32,
1495  r_mask, g_mask, b_mask);
1496  ret = AVERROR_PATCHWELCOME;
1497  goto header_fail;
1498  }
1499  } else {
1500  avpriv_request_sample(avctx, "bpp=%d", c->bpp);
1501  ret = AVERROR_PATCHWELCOME;
1502  goto header_fail;
1503  }
1504  if (g2m_init_buffers(c)) {
1505  ret = AVERROR(ENOMEM);
1506  goto header_fail;
1507  }
1508  got_header = 1;
1509  break;
1510  case TILE_DATA:
1511  if (!c->tiles_x || !c->tiles_y) {
1512  av_log(avctx, AV_LOG_WARNING,
1513  "No display info - skipping tile\n");
1514  break;
1515  }
1516  if (chunk_size < 2) {
1517  av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
1518  chunk_size);
1519  break;
1520  }
1521  c->tile_x = bytestream2_get_byte(&bc);
1522  c->tile_y = bytestream2_get_byte(&bc);
1523  if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
1524  av_log(avctx, AV_LOG_ERROR,
1525  "Invalid tile pos %d,%d (in %dx%d grid)\n",
1526  c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
1527  break;
1528  }
1529  ret = 0;
1530  switch (c->compression) {
1531  case COMPR_EPIC_J_B:
1532  ret = epic_jb_decode_tile(c, c->tile_x, c->tile_y,
1533  buf + bytestream2_tell(&bc),
1534  chunk_size - 2, avctx);
1535  break;
1536  case COMPR_KEMPF_J_B:
1537  ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
1538  buf + bytestream2_tell(&bc),
1539  chunk_size - 2);
1540  break;
1541  }
1542  if (ret && c->framebuf)
1543  av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
1544  c->tile_x, c->tile_y);
1545  break;
1546  case CURSOR_POS:
1547  if (chunk_size < 5) {
1548  av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
1549  chunk_size);
1550  break;
1551  }
1552  c->cursor_x = bytestream2_get_be16(&bc);
1553  c->cursor_y = bytestream2_get_be16(&bc);
1554  break;
1555  case CURSOR_SHAPE:
1556  if (chunk_size < 8) {
1557  av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
1558  chunk_size);
1559  break;
1560  }
1561  bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
1562  chunk_size - 4);
1563  g2m_load_cursor(avctx, c, &tbc);
1564  break;
1565  case CHUNK_CC:
1566  case CHUNK_CD:
1567  break;
1568  default:
1569  av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
1570  chunk_type);
1571  }
1572 
1573  /* navigate to next chunk */
1574  bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
1575  }
1576  if (got_header)
1577  c->got_header = 1;
1578 
1579  if (c->width && c->height && c->framebuf) {
1580  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
1581  return ret;
1582 
1583  pic->key_frame = got_header;
1584  pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
1585 
1586  for (i = 0; i < avctx->height; i++)
1587  memcpy(pic->data[0] + i * pic->linesize[0],
1588  c->framebuf + i * c->framebuf_stride,
1589  c->width * 3);
1590  g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
1591 
1592  *got_picture_ptr = 1;
1593  }
1594 
1595  return buf_size;
1596 
1597 header_fail:
1598  c->width =
1599  c->height = 0;
1600  c->tiles_x =
1601  c->tiles_y = 0;
1602  c->tile_width =
1603  c->tile_height = 0;
1604  return ret;
1605 }
1606 
1608 {
1609  G2MContext *const c = avctx->priv_data;
1610  int ret;
1611 
1612  if ((ret = jpg_init(avctx, &c->jc)) != 0) {
1613  av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
1614  jpg_free_context(&c->jc);
1615  return AVERROR(ENOMEM);
1616  }
1617 
1618  avctx->pix_fmt = AV_PIX_FMT_RGB24;
1619 
1620  // store original sizes and check against those if resize happens
1621  c->orig_width = avctx->width;
1622  c->orig_height = avctx->height;
1623 
1624  return 0;
1625 }
1626 
1628 {
1629  G2MContext *const c = avctx->priv_data;
1630 
1631  jpg_free_context(&c->jc);
1632 
1633  av_freep(&c->epic_buf_base);
1634  c->epic_buf = NULL;
1635  av_freep(&c->kempf_buf);
1636  av_freep(&c->kempf_flags);
1637  av_freep(&c->synth_tile);
1638  av_freep(&c->jpeg_tile);
1639  av_freep(&c->cursor);
1640  av_freep(&c->framebuf);
1641 
1642  return 0;
1643 }
1644 
1646  .name = "g2m",
1647  .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
1648  .type = AVMEDIA_TYPE_VIDEO,
1649  .id = AV_CODEC_ID_G2M,
1650  .priv_data_size = sizeof(G2MContext),
1651  .init = g2m_decode_init,
1652  .close = g2m_decode_end,
1654  .capabilities = AV_CODEC_CAP_DR1,
1655  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
1656 };
#define LOAD_NEIGHBOURS(x)
Definition: g2meet.c:370
static int 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)
Definition: g2meet.c:758
int plane
Definition: avisynth_c.h:422
int tiles_y
Definition: g2meet.c:141
int cursor_hot_y
Definition: g2meet.c:158
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:771
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int epic_handle_edges(ePICContext *dc, int x, int y, const uint32_t *curr_row, const uint32_t *above_row, uint32_t *pPix)
Definition: g2meet.c:581
static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y, const uint8_t *src, int src_size)
Definition: g2meet.c:1067
void * av_realloc(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory.
Definition: mem.c:135
static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
Definition: g2meet.c:447
static float alpha(float a)
This structure describes decoded (raw) audio or video data.
Definition: frame.h:201
uint8_t * kempf_flags
Definition: g2meet.c:152
int height
Definition: g2meet.c:138
ChunkType
Definition: g2meet.c:47
static av_cold void jpg_free_context(JPGContext *ctx)
Definition: g2meet.c:211
uint8_t * epic_buf
Definition: g2meet.c:148
uint8_t * kempf_buf
Definition: g2meet.c:152
misc image utilities
static int chunk_start(AVFormatContext *s)
Definition: webm_chunk.c:157
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:262
int width
Definition: g2meet.c:138
uint32_t pixel
Definition: g2meet.c:85
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:68
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:211
static int epic_predict_pixel(ePICContext *dc, uint8_t *rung, uint32_t *pPix, uint32_t pix)
Definition: g2meet.c:570
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:205
Definition: vf_geq.c:47
int got_header
Definition: g2meet.c:143
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int cursor_fmt
Definition: g2meet.c:156
uint8_t nw_pred_rung[256]
Definition: g2meet.c:109
Entropy Logarithmic-Scale binary arithmetic coder.
void(* clear_block)(int16_t *block)
Definition: blockdsp.h:36
#define avpriv_request_sample(...)
static void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
Definition: g2meet.c:280
static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height, int tile_width, int stride)
Definition: g2meet.c:815
uint32_t stack[EPIC_PIX_STACK_SIZE]
Definition: g2meet.c:115
int ff_init_vlc_sparse(VLC *vlc_arg, int nb_bits, int nb_codes, const void *bits, int bits_wrap, int bits_size, const void *codes, int codes_wrap, int codes_size, const void *symbols, int symbols_wrap, int symbols_size, int flags)
Definition: bitstream.c:273
Scantable.
Definition: idctdsp.h:31
int size
Definition: avcodec.h:1680
int next_run_pos
Definition: g2meet.c:103
int flag
Definition: cpu.c:34
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:60
#define EPIC_HASH_SIZE
Definition: g2meet.c:94
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1989
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
VLC dc_vlc[2]
Definition: g2meet.c:124
uint8_t permutated[64]
Definition: idctdsp.h:33
uint8_t run
Definition: svq3.c:206
#define R_shift
Definition: g2meet.c:390
#define src
Definition: vp8dsp.c:254
static int g2m_init_buffers(G2MContext *c)
Definition: g2meet.c:1178
int stride
Definition: mace.c:144
int swapuv
Definition: g2meet.c:150
AVCodec.
Definition: avcodec.h:3739
int16_t block[6][64]
Definition: g2meet.c:126
MJPEG encoder and decoder.
static void jpg_unescape(const uint8_t *src, int src_size, uint8_t *dst, int *dst_size)
Definition: g2meet.c:223
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
#define B_shift
Definition: g2meet.c:392
int tile_width
Definition: g2meet.c:140
static int16_t block[64]
Definition: dct.c:115
uint8_t rung
Definition: g2meet.c:86
int bpp
Definition: g2meet.c:138
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, const uint8_t *bits_table, const uint8_t *val_table)
Definition: jpegtables.c:127
uint8_t bits
Definition: crc.c:296
uint8_t
#define av_cold
Definition: attributes.h:82
int tile_x
Definition: g2meet.c:141
static int epic_cache_entries_for_pixel(const ePICPixHash *hash, uint32_t pix)
Definition: g2meet.c:468
float delta
#define Y
Definition: vf_boxblur.c:76
static ePICPixHashElem * epic_hash_find(const ePICPixHash *hash, uint32_t key)
Definition: g2meet.c:412
int cursor_h
Definition: g2meet.c:157
static int epic_decode_component_pred(ePICContext *dc, int N, int W, int NW)
Definition: g2meet.c:511
static int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
Definition: g2meet.c:498
ePICPixHash hash
Definition: g2meet.c:116
const uint8_t avpriv_mjpeg_bits_dc_luminance[17]
Definition: jpegtables.c:65
int framebuf_stride
Definition: g2meet.c:146
struct ePICPixListElem * list
Definition: g2meet.c:91
#define N
Definition: vf_pp7.c:73
const char data[16]
Definition: mxf.c:90
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:104
#define height
uint8_t N_ctx_rung[512]
Definition: g2meet.c:108
uint8_t * data
Definition: avcodec.h:1679
bitstream reader API header.
uint8_t * framebuf
Definition: g2meet.c:145
static void epic_free_pixel_cache(ePICPixHash *hash)
Definition: g2meet.c:479
int version
Definition: g2meet.c:135
ScanTable scantable
Definition: g2meet.c:122
#define G_shift
Definition: g2meet.c:391
static av_cold int g2m_decode_init(AVCodecContext *avctx)
Definition: g2meet.c:1607
uint8_t W_ctx_rung[256]
Definition: g2meet.c:107
#define FFALIGN(x, a)
Definition: macros.h:48
VLC ac_vlc[2]
Definition: g2meet.c:124
#define av_log(a,...)
static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
Definition: g2meet.c:182
uint8_t hash[HASH_SIZE]
Definition: movenc.c:57
#define U(x)
Definition: vp56_arith.h:37
int err
Definition: elsdec.h:40
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:589
uint8_t * buf
Definition: g2meet.c:128
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
ElsUnsignedRung unsigned_rung
Definition: g2meet.c:104
static const uint16_t mask[17]
Definition: lzw.c:38
static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c, GetByteContext *gb)
Definition: g2meet.c:1222
static av_cold int g2m_decode_end(AVCodecContext *avctx)
Definition: g2meet.c:1627
ePICContext ec
Definition: g2meet.c:132
#define AVERROR(e)
Definition: error.h:43
static av_always_inline void bytestream2_skip(GetByteContext *g, unsigned int size)
Definition: bytestream.h:164
const uint8_t avpriv_mjpeg_bits_dc_chrominance[17]
Definition: jpegtables.c:70
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:37
uint8_t runlen_zeroes[14]
Definition: g2meet.c:112
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:181
int old_tile_h
Definition: g2meet.c:149
int cursor_stride
Definition: g2meet.c:155
int orig_height
Definition: g2meet.c:139
static int epic_jb_decode_tile(G2MContext *c, int tile_x, int tile_y, const uint8_t *src, size_t src_size, AVCodecContext *avctx)
Definition: g2meet.c:881
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
uint16_t width
Definition: gdv.c:47
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:222
const char * name
Name of the codec implementation.
Definition: avcodec.h:3746
void ff_els_decoder_init(ElsDecCtx *ctx, const uint8_t *in, size_t data_size)
Definition: elsdec.c:247
static ePICPixHashElem * epic_hash_add(ePICPixHash *hash, uint32_t key)
Definition: g2meet.c:424
int64_t max_pixels
The number of pixels per image to maximally accept.
Definition: avcodec.h:3646
int orig_width
Definition: g2meet.c:139
static void * av_mallocz_array(size_t nmemb, size_t size)
Allocate a memory block for an array with av_mallocz().
Definition: mem.h:229
Definition: vlc.h:26
static int jpg_decode_block(JPGContext *c, GetBitContext *gb, int plane, int16_t *block)
Definition: g2meet.c:240
uint8_t prev_row_rung[14]
Definition: g2meet.c:111
uint8_t * cursor
Definition: g2meet.c:154
int prev_dc[3]
Definition: g2meet.c:125
static FFFrameBucket * bucket(FFFrameQueue *fq, size_t idx)
Definition: framequeue.c:25
Compression
Definition: g2meet.c:56
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:284
static int 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)
Definition: g2meet.c:287
#define FFMIN(a, b)
Definition: common.h:96
static int g2m_decode_frame(AVCodecContext *avctx, void *data, int *got_picture_ptr, AVPacket *avpkt)
Definition: g2meet.c:1393
uint8_t * synth_tile
Definition: g2meet.c:148
int width
picture width / height.
Definition: avcodec.h:1948
AVFormatContext * ctx
Definition: movenc.c:48
int cursor_y
Definition: g2meet.c:157
static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung, uint32_t *pPix, uint32_t pix)
Definition: g2meet.c:747
static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
Definition: g2meet.c:1344
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:556
int tile_y
Definition: g2meet.c:141
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:96
if(ret< 0)
Definition: vf_mcdeint.c:279
int old_tile_w
Definition: g2meet.c:149
uint8_t ne_pred_rung[256]
Definition: g2meet.c:110
#define FF_ARRAY_ELEMS(a)
static const float pred[4]
Definition: siprdata.h:259
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
ElsDecCtx els_ctx
Definition: g2meet.c:102
static uint32_t epic_decode_pixel_pred(ePICContext *dc, int x, int y, const uint32_t *curr_row, const uint32_t *above_row)
Definition: g2meet.c:518
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
#define TOSIGNED(val)
Definition: g2meet.c:509
#define EPIC_PIX_STACK_MAX
Definition: g2meet.c:45
AVCodec ff_g2m_decoder
Definition: g2meet.c:1645
int av_reallocp(void *ptr, size_t size)
Allocate, reallocate, or free a block of memory through a pointer to a pointer.
Definition: mem.c:163
Libavcodec external API header.
static int 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)
Definition: g2meet.c:1032
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:232
#define APPLY_ALPHA(src, new, alpha)
Definition: g2meet.c:1341
int tile_stride
Definition: g2meet.c:149
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:457
int bucket_size[EPIC_HASH_SIZE]
Definition: g2meet.c:97
main external API structure.
Definition: avcodec.h:1761
Definition: vf_geq.c:47
static av_cold int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table, int nb_codes, int is_ac)
Definition: g2meet.c:161
static int get_xbits(GetBitContext *s, int n)
Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB).
Definition: get_bits.h:219
JPGContext jc
Definition: g2meet.c:133
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1669
void * buf
Definition: avisynth_c.h:690
const uint8_t avpriv_mjpeg_val_dc[12]
Definition: jpegtables.c:67
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
#define W(a, i, v)
Definition: jpegls.h:122
int compression
Definition: g2meet.c:137
static int djb2_hash(uint32_t key)
Definition: g2meet.c:395
Definition: vf_geq.c:47
int epic_buf_stride
Definition: g2meet.c:149
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
#define mid_pred
Definition: mathops.h:97
int cursor_w
Definition: g2meet.c:157
ePICPixHashElem * bucket[EPIC_HASH_SIZE]
Definition: g2meet.c:96
uint8_t runlen_one
Definition: g2meet.c:113
int cursor_hot_x
Definition: g2meet.c:158
const uint8_t avpriv_mjpeg_bits_ac_chrominance[17]
Definition: jpegtables.c:99
unsigned ff_els_decode_unsigned(ElsDecCtx *ctx, ElsUnsignedRung *ur)
Definition: elsdec.c:350
static const uint8_t chroma_quant[64]
Definition: g2meet.c:72
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi - 0x80) *(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t, *(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t, *(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31)))) #define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac) { } void ff_audio_convert_free(AudioConvert **ac) { if(! *ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);} AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map) { AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method !=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2) { ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc) { av_free(ac);return NULL;} return ac;} in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar) { ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar ? ac->channels :1;} else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;} int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in) { int use_generic=1;int len=in->nb_samples;int p;if(ac->dc) { av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (dithered)\", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> dc
const uint8_t avpriv_mjpeg_val_ac_chrominance[]
Definition: jpegtables.c:102
static int epic_decode_from_cache(ePICContext *dc, uint32_t W, uint32_t *pPix)
Definition: g2meet.c:786
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define SIZE_SPECIFIER
Definition: internal.h:257
struct ePICPixListElem * next
Definition: g2meet.c:84
int bucket_fill[EPIC_HASH_SIZE]
Definition: g2meet.c:98
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:215
int tiles_x
Definition: g2meet.c:141
uint8_t W_flag_rung
Definition: g2meet.c:105
uint8_t * epic_buf_base
Definition: g2meet.c:148
static void epic_hash_init(ePICPixHash *hash)
Definition: g2meet.c:407
common internal api header.
uint32_t pix_id
Definition: g2meet.c:90
uint8_t N_flag_rung
Definition: g2meet.c:106
static double c[64]
BlockDSPContext bdsp
Definition: g2meet.c:120
int cursor_x
Definition: g2meet.c:157
int av_image_check_size2(unsigned int w, unsigned int h, int64_t max_pixels, enum AVPixelFormat pix_fmt, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of a plane of an image with...
Definition: imgutils.c:252
IDCTDSPContext idsp
Definition: g2meet.c:121
static const uint8_t luma_quant[64]
Definition: g2meet.c:61
#define MKBETAG(a, b, c, d)
Definition: common.h:343
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:777
const uint8_t avpriv_mjpeg_bits_ac_luminance[17]
Definition: jpegtables.c:73
void * priv_data
Definition: avcodec.h:1803
int tile_height
Definition: g2meet.c:140
#define av_free(p)
av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st, const uint8_t *src_scantable)
Definition: idctdsp.c:29
int stack_pos
Definition: g2meet.c:114
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:238
int len
#define UPDATE_NEIGHBOURS(x)
Definition: g2meet.c:381
const uint8_t avpriv_mjpeg_val_ac_luminance[]
Definition: jpegtables.c:75
#define EPIC_PIX_STACK_SIZE
Definition: g2meet.c:44
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
void ff_els_decoder_uninit(ElsUnsignedRung *rung)
Definition: elsdec.c:272
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:279
int ff_els_decode_bit(ElsDecCtx *ctx, uint8_t *rung)
Definition: elsdec.c:291
int old_width
Definition: g2meet.c:146
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2554
FILE * out
Definition: movenc.c:54
static int 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)
Definition: g2meet.c:612
#define av_freep(p)
void(* idct)(int16_t *block)
Definition: idctdsp.h:65
uint8_t * jpeg_tile
Definition: g2meet.c:148
int old_height
Definition: g2meet.c:146
This structure stores compressed data.
Definition: avcodec.h:1656
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:359
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:1002
for(j=16;j >0;--j)
Predicted.
Definition: avutil.h:275
#define V
Definition: avdct.c:30
static uint8_t tmp[11]
Definition: aes_ctr.c:26