FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
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/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 
46 enum ChunkType {
47  DISPLAY_INFO = 0xC8,
53 };
54 
58 };
59 
60 static 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 
71 static 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 
82 typedef struct ePICPixListElem {
84  uint32_t pixel;
87 
88 typedef struct ePICPixHashElem {
89  uint32_t pix_id;
92 
93 #define EPIC_HASH_SIZE 256
94 typedef struct ePICPixHash {
98 } ePICPixHash;
99 
100 typedef struct ePICContext {
116 } ePICContext;
117 
118 typedef struct JPGContext {
122 
123  VLC dc_vlc[2], ac_vlc[2];
124  int prev_dc[3];
125  DECLARE_ALIGNED(16, int16_t, block)[6][64];
126 
128 } JPGContext;
129 
130 typedef struct G2MContext {
133 
134  int version;
135 
137  int width, height, bpp;
141 
143 
146 
149  int swapuv;
150 
152 
158 } G2MContext;
159 
160 static 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 
182 {
183  int ret;
184 
186  avpriv_mjpeg_val_dc, 12, 0);
187  if (ret)
188  return ret;
190  avpriv_mjpeg_val_dc, 12, 0);
191  if (ret)
192  return ret;
195  if (ret)
196  return ret;
199  if (ret)
200  return ret;
201 
202  ff_blockdsp_init(&c->bdsp, avctx);
203  ff_idctdsp_init(&c->idsp, avctx);
206 
207  return 0;
208 }
209 
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 
222 static 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 
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 
276 static 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 
283 static 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 */
391 static 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 
404 {
405  memset(hash, 0, sizeof(*hash));
406 }
407 
408 static 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 
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 
443 static 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 
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 
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 
494 static 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 
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 
514 static 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 
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 
577 static 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) |
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 
608 static 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 &&
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 
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 
754 static 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 
782 static 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 
811 static 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 
874 static 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 */
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 
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 
1019 static 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 
1054 static 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 
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 +
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 
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 
1331 static 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 
1378 static 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  av_log(avctx, AV_LOG_ERROR,
1446  "Unknown compression method %d\n",
1447  c->compression);
1448  ret = AVERROR_PATCHWELCOME;
1449  goto header_fail;
1450  }
1451  c->tile_width = bytestream2_get_be32(&bc);
1452  c->tile_height = bytestream2_get_be32(&bc);
1453  if (c->tile_width <= 0 || c->tile_height <= 0 ||
1454  ((c->tile_width | c->tile_height) & 0xF) ||
1455  c->tile_width * (uint64_t)c->tile_height >= INT_MAX / 4
1456  ) {
1457  av_log(avctx, AV_LOG_ERROR,
1458  "Invalid tile dimensions %dx%d\n",
1459  c->tile_width, c->tile_height);
1460  ret = AVERROR_INVALIDDATA;
1461  goto header_fail;
1462  }
1463  c->tiles_x = (c->width + c->tile_width - 1) / c->tile_width;
1464  c->tiles_y = (c->height + c->tile_height - 1) / c->tile_height;
1465  c->bpp = bytestream2_get_byte(&bc);
1466  if (c->bpp == 32) {
1467  if (bytestream2_get_bytes_left(&bc) < 16 ||
1468  (chunk_size - 21) < 16) {
1469  av_log(avctx, AV_LOG_ERROR,
1470  "Display info: missing bitmasks!\n");
1471  ret = AVERROR_INVALIDDATA;
1472  goto header_fail;
1473  }
1474  r_mask = bytestream2_get_be32(&bc);
1475  g_mask = bytestream2_get_be32(&bc);
1476  b_mask = bytestream2_get_be32(&bc);
1477  if (r_mask != 0xFF0000 || g_mask != 0xFF00 || b_mask != 0xFF) {
1478  av_log(avctx, AV_LOG_ERROR,
1479  "Invalid or unsupported bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32"\n",
1480  r_mask, g_mask, b_mask);
1481  ret = AVERROR_PATCHWELCOME;
1482  goto header_fail;
1483  }
1484  } else {
1485  avpriv_request_sample(avctx, "bpp=%d", c->bpp);
1486  ret = AVERROR_PATCHWELCOME;
1487  goto header_fail;
1488  }
1489  if (g2m_init_buffers(c)) {
1490  ret = AVERROR(ENOMEM);
1491  goto header_fail;
1492  }
1493  got_header = 1;
1494  break;
1495  case TILE_DATA:
1496  if (!c->tiles_x || !c->tiles_y) {
1497  av_log(avctx, AV_LOG_WARNING,
1498  "No display info - skipping tile\n");
1499  break;
1500  }
1501  if (chunk_size < 2) {
1502  av_log(avctx, AV_LOG_ERROR, "Invalid tile data size %"PRIu32"\n",
1503  chunk_size);
1504  break;
1505  }
1506  c->tile_x = bytestream2_get_byte(&bc);
1507  c->tile_y = bytestream2_get_byte(&bc);
1508  if (c->tile_x >= c->tiles_x || c->tile_y >= c->tiles_y) {
1509  av_log(avctx, AV_LOG_ERROR,
1510  "Invalid tile pos %d,%d (in %dx%d grid)\n",
1511  c->tile_x, c->tile_y, c->tiles_x, c->tiles_y);
1512  break;
1513  }
1514  ret = 0;
1515  switch (c->compression) {
1516  case COMPR_EPIC_J_B:
1517  ret = epic_jb_decode_tile(c, c->tile_x, c->tile_y,
1518  buf + bytestream2_tell(&bc),
1519  chunk_size - 2, avctx);
1520  break;
1521  case COMPR_KEMPF_J_B:
1522  ret = kempf_decode_tile(c, c->tile_x, c->tile_y,
1523  buf + bytestream2_tell(&bc),
1524  chunk_size - 2);
1525  break;
1526  }
1527  if (ret && c->framebuf)
1528  av_log(avctx, AV_LOG_ERROR, "Error decoding tile %d,%d\n",
1529  c->tile_x, c->tile_y);
1530  break;
1531  case CURSOR_POS:
1532  if (chunk_size < 5) {
1533  av_log(avctx, AV_LOG_ERROR, "Invalid cursor pos size %"PRIu32"\n",
1534  chunk_size);
1535  break;
1536  }
1537  c->cursor_x = bytestream2_get_be16(&bc);
1538  c->cursor_y = bytestream2_get_be16(&bc);
1539  break;
1540  case CURSOR_SHAPE:
1541  if (chunk_size < 8) {
1542  av_log(avctx, AV_LOG_ERROR, "Invalid cursor data size %"PRIu32"\n",
1543  chunk_size);
1544  break;
1545  }
1546  bytestream2_init(&tbc, buf + bytestream2_tell(&bc),
1547  chunk_size - 4);
1548  g2m_load_cursor(avctx, c, &tbc);
1549  break;
1550  case CHUNK_CC:
1551  case CHUNK_CD:
1552  break;
1553  default:
1554  av_log(avctx, AV_LOG_WARNING, "Skipping chunk type %02d\n",
1555  chunk_type);
1556  }
1557 
1558  /* navigate to next chunk */
1559  bytestream2_skip(&bc, chunk_start + chunk_size - bytestream2_tell(&bc));
1560  }
1561  if (got_header)
1562  c->got_header = 1;
1563 
1564  if (c->width && c->height && c->framebuf) {
1565  if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
1566  return ret;
1567 
1568  pic->key_frame = got_header;
1569  pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
1570 
1571  for (i = 0; i < avctx->height; i++)
1572  memcpy(pic->data[0] + i * pic->linesize[0],
1573  c->framebuf + i * c->framebuf_stride,
1574  c->width * 3);
1575  g2m_paint_cursor(c, pic->data[0], pic->linesize[0]);
1576 
1577  *got_picture_ptr = 1;
1578  }
1579 
1580  return buf_size;
1581 
1582 header_fail:
1583  c->width =
1584  c->height = 0;
1585  c->tiles_x =
1586  c->tiles_y = 0;
1587  c->tile_width =
1588  c->tile_height = 0;
1589  return ret;
1590 }
1591 
1593 {
1594  G2MContext *const c = avctx->priv_data;
1595  int ret;
1596 
1597  if ((ret = jpg_init(avctx, &c->jc)) != 0) {
1598  av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
1599  jpg_free_context(&c->jc);
1600  return AVERROR(ENOMEM);
1601  }
1602 
1603  avctx->pix_fmt = AV_PIX_FMT_RGB24;
1604 
1605  // store original sizes and check against those if resize happens
1606  c->orig_width = avctx->width;
1607  c->orig_height = avctx->height;
1608 
1609  return 0;
1610 }
1611 
1613 {
1614  G2MContext *const c = avctx->priv_data;
1615 
1616  jpg_free_context(&c->jc);
1617 
1618  av_freep(&c->epic_buf_base);
1619  c->epic_buf = NULL;
1620  av_freep(&c->kempf_buf);
1621  av_freep(&c->kempf_flags);
1622  av_freep(&c->synth_tile);
1623  av_freep(&c->jpeg_tile);
1624  av_freep(&c->cursor);
1625  av_freep(&c->framebuf);
1626 
1627  return 0;
1628 }
1629 
1631  .name = "g2m",
1632  .long_name = NULL_IF_CONFIG_SMALL("Go2Meeting"),
1633  .type = AVMEDIA_TYPE_VIDEO,
1634  .id = AV_CODEC_ID_G2M,
1635  .priv_data_size = sizeof(G2MContext),
1636  .init = g2m_decode_init,
1637  .close = g2m_decode_end,
1639  .capabilities = AV_CODEC_CAP_DR1,
1640  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
1641 };
#define LOAD_NEIGHBOURS(x)
Definition: g2meet.c:366
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:754
int plane
Definition: avisynth_c.h:291
int tiles_y
Definition: g2meet.c:140
int cursor_hot_y
Definition: g2meet.c:157
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:634
#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:577
static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y, const uint8_t *src, int src_size)
Definition: g2meet.c:1054
static int epic_add_pixel_to_cache(ePICPixHash *hash, uint32_t key, uint32_t pix)
Definition: g2meet.c:443
This structure describes decoded (raw) audio or video data.
Definition: frame.h:180
uint8_t * kempf_flags
Definition: g2meet.c:151
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int height
Definition: g2meet.c:137
void(* clear_block)(int16_t *block)
Definition: blockdsp.h:35
ChunkType
Definition: g2meet.c:46
static av_cold void jpg_free_context(JPGContext *ctx)
Definition: g2meet.c:210
AVFormatContext * ctx
Definition: movenc-test.c:48
uint8_t * epic_buf
Definition: g2meet.c:147
uint8_t * kempf_buf
Definition: g2meet.c:151
static int chunk_start(AVFormatContext *s)
Definition: webm_chunk.c:141
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:260
int width
Definition: g2meet.c:137
uint32_t pixel
Definition: g2meet.c:84
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
packed RGB 8:8:8, 24bpp, RGBRGB...
Definition: pixfmt.h:64
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:210
static int epic_predict_pixel(ePICContext *dc, uint8_t *rung, uint32_t *pPix, uint32_t pix)
Definition: g2meet.c:566
static void skip_bits_long(GetBitContext *s, int n)
Definition: get_bits.h:217
int got_header
Definition: g2meet.c:142
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int cursor_fmt
Definition: g2meet.c:155
uint8_t nw_pred_rung[256]
Definition: g2meet.c:108
Entropy Logarithmic-Scale binary arithmetic coder.
static void yuv2rgb(uint8_t *out, int ridx, int Y, int U, int V)
Definition: g2meet.c:276
static int epic_decode_tile(ePICContext *dc, uint8_t *out, int tile_height, int tile_width, int stride)
Definition: g2meet.c:811
uint32_t stack[EPIC_PIX_STACK_SIZE]
Definition: g2meet.c:114
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:275
Scantable.
Definition: idctdsp.h:29
int size
Definition: avcodec.h:1578
int next_run_pos
Definition: g2meet.c:102
void(* clear_blocks)(int16_t *blocks)
Definition: blockdsp.h:36
#define EPIC_HASH_SIZE
Definition: g2meet.c:93
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:53
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1870
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:123
uint8_t permutated[64]
Definition: idctdsp.h:31
uint8_t run
Definition: svq3.c:192
#define R_shift
Definition: g2meet.c:386
static int g2m_init_buffers(G2MContext *c)
Definition: g2meet.c:1165
int swapuv
Definition: g2meet.c:149
AVCodec.
Definition: avcodec.h:3535
int16_t block[6][64]
Definition: g2meet.c:125
MJPEG encoder and decoder.
static void jpg_unescape(const uint8_t *src, int src_size, uint8_t *dst, int *dst_size)
Definition: g2meet.c:222
#define B_shift
Definition: g2meet.c:388
int tile_width
Definition: g2meet.c:139
uint8_t rung
Definition: g2meet.c:85
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
int bpp
Definition: g2meet.c:137
#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:140
static int epic_cache_entries_for_pixel(const ePICPixHash *hash, uint32_t pix)
Definition: g2meet.c:464
float delta
#define Y
Definition: vf_boxblur.c:76
static ePICPixHashElem * epic_hash_find(const ePICPixHash *hash, uint32_t key)
Definition: g2meet.c:408
int cursor_h
Definition: g2meet.c:156
static int epic_decode_component_pred(ePICContext *dc, int N, int W, int NW)
Definition: g2meet.c:507
static int is_pixel_on_stack(const ePICContext *dc, uint32_t pix)
Definition: g2meet.c:494
ePICPixHash hash
Definition: g2meet.c:115
const uint8_t avpriv_mjpeg_bits_dc_luminance[17]
Definition: jpegtables.c:65
int framebuf_stride
Definition: g2meet.c:145
struct ePICPixListElem * list
Definition: g2meet.c:90
#define N
Definition: vf_pp7.c:73
uint8_t N_ctx_rung[512]
Definition: g2meet.c:107
uint8_t * data
Definition: avcodec.h:1577
Definition: vf_geq.c:46
bitstream reader API header.
uint8_t * framebuf
Definition: g2meet.c:144
static void epic_free_pixel_cache(ePICPixHash *hash)
Definition: g2meet.c:475
int version
Definition: g2meet.c:134
ScanTable scantable
Definition: g2meet.c:121
#define G_shift
Definition: g2meet.c:387
static av_cold int g2m_decode_init(AVCodecContext *avctx)
Definition: g2meet.c:1592
uint8_t W_ctx_rung[256]
Definition: g2meet.c:106
#define FFALIGN(x, a)
Definition: macros.h:48
VLC ac_vlc[2]
Definition: g2meet.c:123
#define av_log(a,...)
static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
Definition: g2meet.c:181
#define U(x)
Definition: vp56_arith.h:37
int err
Definition: elsdec.h:40
uint8_t * buf
Definition: g2meet.c:127
static double alpha(void *priv, double x, double y)
Definition: vf_geq.c:99
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
ElsUnsignedRung unsigned_rung
Definition: g2meet.c:103
static const uint16_t mask[17]
Definition: lzw.c:38
static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c, GetByteContext *gb)
Definition: g2meet.c:1209
static av_cold int g2m_decode_end(AVCodecContext *avctx)
Definition: g2meet.c:1612
ePICContext ec
Definition: g2meet.c:131
#define AVERROR(e)
Definition: error.h:43
uint8_t hash[HASH_SIZE]
Definition: movenc-test.c:57
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
uint8_t runlen_zeroes[14]
Definition: g2meet.c:111
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
int old_tile_h
Definition: g2meet.c:148
int cursor_stride
Definition: g2meet.c:154
int orig_height
Definition: g2meet.c:138
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:874
static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
Definition: bytestream.h:154
const char * name
Name of the codec implementation.
Definition: avcodec.h:3542
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:420
int orig_width
Definition: g2meet.c:138
Definition: get_bits.h:63
static int jpg_decode_block(JPGContext *c, GetBitContext *gb, int plane, int16_t *block)
Definition: g2meet.c:239
uint8_t prev_row_rung[14]
Definition: g2meet.c:110
uint8_t * cursor
Definition: g2meet.c:153
int prev_dc[3]
Definition: g2meet.c:124
Compression
Definition: g2meet.c:55
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:254
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:283
int flag
Definition: cpu-test.c:33
#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:1378
uint8_t * synth_tile
Definition: g2meet.c:147
int width
picture width / height.
Definition: avcodec.h:1829
static uint8_t tmp[8]
Definition: des-test.c:38
#define width
int cursor_y
Definition: g2meet.c:156
static int epic_predict_pixel2(ePICContext *dc, uint8_t *rung, uint32_t *pPix, uint32_t pix)
Definition: g2meet.c:743
static void g2m_paint_cursor(G2MContext *c, uint8_t *dst, int stride)
Definition: g2meet.c:1331
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:574
int tile_y
Definition: g2meet.c:140
uint8_t idct_permutation[64]
IDCT input permutation.
Definition: idctdsp.h:94
#define src
Definition: vp9dsp.c:530
int old_tile_w
Definition: g2meet.c:148
uint8_t ne_pred_rung[256]
Definition: g2meet.c:109
static const float pred[4]
Definition: siprdata.h:259
FILE * out
Definition: movenc-test.c:54
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
ElsDecCtx els_ctx
Definition: g2meet.c:101
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:514
static av_always_inline int bytestream2_tell(GetByteContext *g)
Definition: bytestream.h:188
#define TOSIGNED(val)
Definition: g2meet.c:505
#define EPIC_PIX_STACK_MAX
Definition: g2meet.c:44
AVCodec ff_g2m_decoder
Definition: g2meet.c:1630
Libavcodec external API header.
av_cold void ff_blockdsp_init(BlockDSPContext *c, AVCodecContext *avctx)
Definition: blockdsp.c:58
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:1019
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:211
#define APPLY_ALPHA(src, new, alpha)
Definition: g2meet.c:1328
int tile_stride
Definition: g2meet.c:148
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:449
int bucket_size[EPIC_HASH_SIZE]
Definition: g2meet.c:96
Definition: vf_geq.c:46
main external API structure.
Definition: avcodec.h:1642
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:160
static int get_xbits(GetBitContext *s, int n)
read mpeg1 dc style vlc (sign bit + mantissa with no MSB).
Definition: get_bits.h:231
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:928
JPGContext jc
Definition: g2meet.c:132
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;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);returnNULL;}returnac;}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;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->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);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> in
void * buf
Definition: avisynth_c.h:553
const uint8_t avpriv_mjpeg_val_dc[12]
Definition: jpegtables.c:67
#define W(a, i, v)
Definition: jpegls.h:122
int compression
Definition: g2meet.c:136
static int djb2_hash(uint32_t key)
Definition: g2meet.c:391
int epic_buf_stride
Definition: g2meet.c:148
const uint8_t ff_zigzag_direct[64]
Definition: mathtables.c:98
#define mid_pred
Definition: mathops.h:96
int cursor_w
Definition: g2meet.c:156
ePICPixHashElem * bucket[EPIC_HASH_SIZE]
Definition: g2meet.c:95
uint8_t runlen_one
Definition: g2meet.c:112
int cursor_hot_x
Definition: g2meet.c:157
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:71
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:782
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:252
struct ePICPixListElem * next
Definition: g2meet.c:83
int bucket_fill[EPIC_HASH_SIZE]
Definition: g2meet.c:97
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:194
int tiles_x
Definition: g2meet.c:140
uint8_t W_flag_rung
Definition: g2meet.c:104
uint8_t * epic_buf_base
Definition: g2meet.c:147
static void epic_hash_init(ePICPixHash *hash)
Definition: g2meet.c:403
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:722
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
common internal api header.
if(ret< 0)
Definition: vf_mcdeint.c:282
uint32_t pix_id
Definition: g2meet.c:89
uint8_t N_flag_rung
Definition: g2meet.c:105
void * av_realloc(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:145
static double c[64]
int av_reallocp(void *ptr, size_t size)
Allocate or reallocate a block of memory.
Definition: mem.c:187
BlockDSPContext bdsp
Definition: g2meet.c:119
int cursor_x
Definition: g2meet.c:156
IDCTDSPContext idsp
Definition: g2meet.c:120
static const uint8_t luma_quant[64]
Definition: g2meet.c:60
#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:728
Definition: vf_geq.c:46
const uint8_t avpriv_mjpeg_bits_ac_luminance[17]
Definition: jpegtables.c:73
void * priv_data
Definition: avcodec.h:1684
int tile_height
Definition: g2meet.c:139
#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:113
av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
Definition: idctdsp.c:241
int len
#define UPDATE_NEIGHBOURS(x)
Definition: g2meet.c:377
const uint8_t avpriv_mjpeg_val_ac_luminance[]
Definition: jpegtables.c:75
#define EPIC_PIX_STACK_SIZE
Definition: g2meet.c:43
VLC_TYPE(* table)[2]
code, bits
Definition: get_bits.h:65
void ff_els_decoder_uninit(ElsUnsignedRung *rung)
Definition: elsdec.c:272
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:249
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(constuint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(constint16_t *) pi >>8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(constint16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(constint32_t *) pi >>24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(constint32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(constfloat *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(constfloat *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(constfloat *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(constdouble *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(constdouble *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(constdouble *) pi *(1U<< 31))))#defineSET_CONV_FUNC_GROUP(ofmt, ifmt) staticvoidset_generic_function(AudioConvert *ac){}voidff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enumAVSampleFormatout_fmt, enumAVSampleFormatin_fmt, intchannels, intsample_rate, intapply_map){AudioConvert *ac;intin_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) returnNULL;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);returnNULL;}returnac;}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;}elseif(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;elseac->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);returnac;}intff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){intuse_generic=1;intlen=in->nb_samples;intp;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%dsamples-audio_convert:%sto%s(dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));returnff_convert_dither(ac-> dc
int ff_els_decode_bit(ElsDecCtx *ctx, uint8_t *rung)
Definition: elsdec.c:291
int old_width
Definition: g2meet.c:145
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:229
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2434
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:608
#define av_freep(p)
#define stride
#define height
uint8_t * jpeg_tile
Definition: g2meet.c:147
int old_height
Definition: g2meet.c:145
This structure stores compressed data.
Definition: avcodec.h:1554
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:360
void * av_mallocz(size_t size)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:252
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:953
for(j=16;j >0;--j)
Predicted.
Definition: avutil.h:267
#define V
Definition: avdct.c:30
void(* idct)(int16_t *block)
Definition: idctdsp.h:63
static int16_t block[64]
Definition: dct-test.c:112