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vp6.c
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1 /*
2  * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * VP6 compatible video decoder
24  *
25  * The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
26  * - upper 4 bits: difference between encoded width and visible width
27  * - lower 4 bits: difference between encoded height and visible height
28  */
29 
30 #include <stdlib.h>
31 
32 #include "avcodec.h"
33 #include "get_bits.h"
34 #include "huffman.h"
35 #include "internal.h"
36 
37 #include "vp56.h"
38 #include "vp56data.h"
39 #include "vp6data.h"
40 
41 #define VP6_MAX_HUFF_SIZE 12
42 
43 static int vp6_parse_coeff(VP56Context *s);
44 static int vp6_parse_coeff_huffman(VP56Context *s);
45 
46 static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
47 {
48  VP56RangeCoder *c = &s->c;
49  int parse_filter_info = 0;
50  int coeff_offset = 0;
51  int vrt_shift = 0;
52  int sub_version;
53  int rows, cols;
54  int res = 0;
55  int ret;
56  int separated_coeff = buf[0] & 1;
57 
58  s->frames[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
59  ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
60 
61  if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
62  sub_version = buf[1] >> 3;
63  if (sub_version > 8)
64  return AVERROR_INVALIDDATA;
65  s->filter_header = buf[1] & 0x06;
66  if (buf[1] & 1) {
67  avpriv_report_missing_feature(s->avctx, "Interlacing");
68  return AVERROR_PATCHWELCOME;
69  }
70  if (separated_coeff || !s->filter_header) {
71  coeff_offset = AV_RB16(buf+2) - 2;
72  buf += 2;
73  buf_size -= 2;
74  }
75 
76  rows = buf[2]; /* number of stored macroblock rows */
77  cols = buf[3]; /* number of stored macroblock cols */
78  /* buf[4] is number of displayed macroblock rows */
79  /* buf[5] is number of displayed macroblock cols */
80  if (!rows || !cols) {
81  av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", cols << 4, rows << 4);
82  return AVERROR_INVALIDDATA;
83  }
84 
85  if (!s->macroblocks || /* first frame */
86  16*cols != s->avctx->coded_width ||
87  16*rows != s->avctx->coded_height) {
88  if (s->avctx->extradata_size == 0 &&
89  FFALIGN(s->avctx->width, 16) == 16 * cols &&
90  FFALIGN(s->avctx->height, 16) == 16 * rows) {
91  // We assume this is properly signalled container cropping,
92  // in an F4V file. Just set the coded_width/height, don't
93  // touch the cropped ones.
94  s->avctx->coded_width = 16 * cols;
95  s->avctx->coded_height = 16 * rows;
96  } else {
97  ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
98  if (ret < 0)
99  return ret;
100 
101  if (s->avctx->extradata_size == 1) {
102  s->avctx->width -= s->avctx->extradata[0] >> 4;
103  s->avctx->height -= s->avctx->extradata[0] & 0x0F;
104  }
105  }
106  res = VP56_SIZE_CHANGE;
107  }
108 
109  ret = ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
110  if (ret < 0)
111  goto fail;
112  vp56_rac_gets(c, 2);
113 
114  parse_filter_info = s->filter_header;
115  if (sub_version < 8)
116  vrt_shift = 5;
117  s->sub_version = sub_version;
118  s->golden_frame = 0;
119  } else {
120  if (!s->sub_version || !s->avctx->coded_width || !s->avctx->coded_height)
121  return AVERROR_INVALIDDATA;
122 
123  if (separated_coeff || !s->filter_header) {
124  coeff_offset = AV_RB16(buf+1) - 2;
125  buf += 2;
126  buf_size -= 2;
127  }
128  ret = ff_vp56_init_range_decoder(c, buf+1, buf_size-1);
129  if (ret < 0)
130  return ret;
131 
132  s->golden_frame = vp56_rac_get(c);
133  if (s->filter_header) {
134  s->deblock_filtering = vp56_rac_get(c);
135  if (s->deblock_filtering)
136  vp56_rac_get(c);
137  if (s->sub_version > 7)
138  parse_filter_info = vp56_rac_get(c);
139  }
140  }
141 
142  if (parse_filter_info) {
143  if (vp56_rac_get(c)) {
144  s->filter_mode = 2;
145  s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
146  s->max_vector_length = 2 << vp56_rac_gets(c, 3);
147  } else if (vp56_rac_get(c)) {
148  s->filter_mode = 1;
149  } else {
150  s->filter_mode = 0;
151  }
152  if (s->sub_version > 7)
153  s->filter_selection = vp56_rac_gets(c, 4);
154  else
155  s->filter_selection = 16;
156  }
157 
158  s->use_huffman = vp56_rac_get(c);
159 
160  s->parse_coeff = vp6_parse_coeff;
161  if (coeff_offset) {
162  buf += coeff_offset;
163  buf_size -= coeff_offset;
164  if (buf_size < 0) {
165  ret = AVERROR_INVALIDDATA;
166  goto fail;
167  }
168  if (s->use_huffman) {
169  s->parse_coeff = vp6_parse_coeff_huffman;
170  init_get_bits(&s->gb, buf, buf_size<<3);
171  } else {
172  ret = ff_vp56_init_range_decoder(&s->cc, buf, buf_size);
173  if (ret < 0)
174  goto fail;
175  s->ccp = &s->cc;
176  }
177  } else {
178  s->ccp = &s->c;
179  }
180 
181  return res;
182 fail:
183  if (res == VP56_SIZE_CHANGE)
184  ff_set_dimensions(s->avctx, 0, 0);
185  return ret;
186 }
187 
188 static void vp6_coeff_order_table_init(VP56Context *s)
189 {
190  int i, pos, idx = 1;
191 
192  s->modelp->coeff_index_to_pos[0] = 0;
193  for (i=0; i<16; i++)
194  for (pos=1; pos<64; pos++)
195  if (s->modelp->coeff_reorder[pos] == i)
196  s->modelp->coeff_index_to_pos[idx++] = pos;
197 }
198 
199 static void vp6_default_models_init(VP56Context *s)
200 {
201  VP56Model *model = s->modelp;
202 
203  model->vector_dct[0] = 0xA2;
204  model->vector_dct[1] = 0xA4;
205  model->vector_sig[0] = 0x80;
206  model->vector_sig[1] = 0x80;
207 
208  memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
209  memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
210  memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
211  memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
212  memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
213 
215 }
216 
217 static void vp6_parse_vector_models(VP56Context *s)
218 {
219  VP56RangeCoder *c = &s->c;
220  VP56Model *model = s->modelp;
221  int comp, node;
222 
223  for (comp=0; comp<2; comp++) {
225  model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
227  model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
228  }
229 
230  for (comp=0; comp<2; comp++)
231  for (node=0; node<7; node++)
232  if (vp56_rac_get_prob_branchy(c, vp6_pdv_pct[comp][node]))
233  model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
234 
235  for (comp=0; comp<2; comp++)
236  for (node=0; node<8; node++)
237  if (vp56_rac_get_prob_branchy(c, vp6_fdv_pct[comp][node]))
238  model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
239 }
240 
241 /* nodes must ascend by count, but with descending symbol order */
242 static int vp6_huff_cmp(const void *va, const void *vb)
243 {
244  const Node *a = va, *b = vb;
245  return (a->count - b->count)*16 + (b->sym - a->sym);
246 }
247 
248 static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
249  const uint8_t *map, unsigned size, VLC *vlc)
250 {
251  Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
252  int a, b, i;
253 
254  /* first compute probabilities from model */
255  tmp[0].count = 256;
256  for (i=0; i<size-1; i++) {
257  a = tmp[i].count * coeff_model[i] >> 8;
258  b = tmp[i].count * (255 - coeff_model[i]) >> 8;
259  nodes[map[2*i ]].count = a + !a;
260  nodes[map[2*i+1]].count = b + !b;
261  }
262 
263  ff_free_vlc(vlc);
264  /* then build the huffman tree according to probabilities */
265  return ff_huff_build_tree(s->avctx, vlc, size, FF_HUFFMAN_BITS,
266  nodes, vp6_huff_cmp,
268 }
269 
270 static int vp6_parse_coeff_models(VP56Context *s)
271 {
272  VP56RangeCoder *c = &s->c;
273  VP56Model *model = s->modelp;
274  int def_prob[11];
275  int node, cg, ctx, pos;
276  int ct; /* code type */
277  int pt; /* plane type (0 for Y, 1 for U or V) */
278 
279  memset(def_prob, 0x80, sizeof(def_prob));
280 
281  for (pt=0; pt<2; pt++)
282  for (node=0; node<11; node++)
283  if (vp56_rac_get_prob_branchy(c, vp6_dccv_pct[pt][node])) {
284  def_prob[node] = vp56_rac_gets_nn(c, 7);
285  model->coeff_dccv[pt][node] = def_prob[node];
286  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
287  model->coeff_dccv[pt][node] = def_prob[node];
288  }
289 
290  if (vp56_rac_get(c)) {
291  for (pos=1; pos<64; pos++)
293  model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
295  }
296 
297  for (cg=0; cg<2; cg++)
298  for (node=0; node<14; node++)
299  if (vp56_rac_get_prob_branchy(c, vp6_runv_pct[cg][node]))
300  model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
301 
302  for (ct=0; ct<3; ct++)
303  for (pt=0; pt<2; pt++)
304  for (cg=0; cg<6; cg++)
305  for (node=0; node<11; node++)
306  if (vp56_rac_get_prob_branchy(c, vp6_ract_pct[ct][pt][cg][node])) {
307  def_prob[node] = vp56_rac_gets_nn(c, 7);
308  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
309  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
310  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
311  }
312 
313  if (s->use_huffman) {
314  for (pt=0; pt<2; pt++) {
315  if (vp6_build_huff_tree(s, model->coeff_dccv[pt],
316  vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]))
317  return -1;
318  if (vp6_build_huff_tree(s, model->coeff_runv[pt],
319  vp6_huff_run_map, 9, &s->runv_vlc[pt]))
320  return -1;
321  for (ct=0; ct<3; ct++)
322  for (cg = 0; cg < 6; cg++)
323  if (vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
324  vp6_huff_coeff_map, 12,
325  &s->ract_vlc[pt][ct][cg]))
326  return -1;
327  }
328  memset(s->nb_null, 0, sizeof(s->nb_null));
329  } else {
330  /* coeff_dcct is a linear combination of coeff_dccv */
331  for (pt=0; pt<2; pt++)
332  for (ctx=0; ctx<3; ctx++)
333  for (node=0; node<5; node++)
334  model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
335  }
336  return 0;
337 }
338 
339 static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
340 {
341  VP56RangeCoder *c = &s->c;
342  VP56Model *model = s->modelp;
343  int comp;
344 
345  *vect = (VP56mv) {0,0};
346  if (s->vector_candidate_pos < 2)
347  *vect = s->vector_candidate[0];
348 
349  for (comp=0; comp<2; comp++) {
350  int i, delta = 0;
351 
352  if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
353  static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
354  for (i=0; i<sizeof(prob_order); i++) {
355  int j = prob_order[i];
356  delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
357  }
358  if (delta & 0xF0)
359  delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
360  else
361  delta |= 8;
362  } else {
364  model->vector_pdv[comp]);
365  }
366 
367  if (delta && vp56_rac_get_prob_branchy(c, model->vector_sig[comp]))
368  delta = -delta;
369 
370  if (!comp)
371  vect->x += delta;
372  else
373  vect->y += delta;
374  }
375 }
376 
377 /**
378  * Read number of consecutive blocks with null DC or AC.
379  * This value is < 74.
380  */
381 static unsigned vp6_get_nb_null(VP56Context *s)
382 {
383  unsigned val = get_bits(&s->gb, 2);
384  if (val == 2)
385  val += get_bits(&s->gb, 2);
386  else if (val == 3) {
387  val = get_bits1(&s->gb) << 2;
388  val = 6+val + get_bits(&s->gb, 2+val);
389  }
390  return val;
391 }
392 
393 static int vp6_parse_coeff_huffman(VP56Context *s)
394 {
395  VP56Model *model = s->modelp;
396  uint8_t *permute = s->idct_scantable;
397  VLC *vlc_coeff;
398  int coeff, sign, coeff_idx;
399  int b, cg, idx;
400  int pt = 0; /* plane type (0 for Y, 1 for U or V) */
401 
402  for (b=0; b<6; b++) {
403  int ct = 0; /* code type */
404  if (b > 3) pt = 1;
405  vlc_coeff = &s->dccv_vlc[pt];
406 
407  for (coeff_idx = 0;;) {
408  int run = 1;
409  if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
410  s->nb_null[coeff_idx][pt]--;
411  if (coeff_idx)
412  break;
413  } else {
414  if (get_bits_left(&s->gb) <= 0)
415  return AVERROR_INVALIDDATA;
416  coeff = get_vlc2(&s->gb, vlc_coeff->table, FF_HUFFMAN_BITS, 3);
417  if (coeff == 0) {
418  if (coeff_idx) {
419  int pt = (coeff_idx >= 6);
420  run += get_vlc2(&s->gb, s->runv_vlc[pt].table, FF_HUFFMAN_BITS, 3);
421  if (run >= 9)
422  run += get_bits(&s->gb, 6);
423  } else
424  s->nb_null[0][pt] = vp6_get_nb_null(s);
425  ct = 0;
426  } else if (coeff == 11) { /* end of block */
427  if (coeff_idx == 1) /* first AC coeff ? */
428  s->nb_null[1][pt] = vp6_get_nb_null(s);
429  break;
430  } else {
431  int coeff2 = ff_vp56_coeff_bias[coeff];
432  if (coeff > 4)
433  coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
434  ct = 1 + (coeff2 > 1);
435  sign = get_bits1(&s->gb);
436  coeff2 = (coeff2 ^ -sign) + sign;
437  if (coeff_idx)
438  coeff2 *= s->dequant_ac;
439  idx = model->coeff_index_to_pos[coeff_idx];
440  s->block_coeff[b][permute[idx]] = coeff2;
441  }
442  }
443  coeff_idx+=run;
444  if (coeff_idx >= 64)
445  break;
446  cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
447  vlc_coeff = &s->ract_vlc[pt][ct][cg];
448  }
449  }
450  return 0;
451 }
452 
453 static int vp6_parse_coeff(VP56Context *s)
454 {
455  VP56RangeCoder *c = s->ccp;
456  VP56Model *model = s->modelp;
457  uint8_t *permute = s->idct_scantable;
458  uint8_t *model1, *model2, *model3;
459  int coeff, sign, coeff_idx;
460  int b, i, cg, idx, ctx;
461  int pt = 0; /* plane type (0 for Y, 1 for U or V) */
462 
463  if (c->end <= c->buffer && c->bits >= 0) {
464  av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp6_parse_coeff\n");
465  return AVERROR_INVALIDDATA;
466  }
467 
468  for (b=0; b<6; b++) {
469  int ct = 1; /* code type */
470  int run = 1;
471 
472  if (b > 3) pt = 1;
473 
474  ctx = s->left_block[ff_vp56_b6to4[b]].not_null_dc
475  + s->above_blocks[s->above_block_idx[b]].not_null_dc;
476  model1 = model->coeff_dccv[pt];
477  model2 = model->coeff_dcct[pt][ctx];
478 
479  coeff_idx = 0;
480  for (;;) {
481  if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob_branchy(c, model2[0])) {
482  /* parse a coeff */
483  if (vp56_rac_get_prob_branchy(c, model2[2])) {
484  if (vp56_rac_get_prob_branchy(c, model2[3])) {
485  idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
486  coeff = ff_vp56_coeff_bias[idx+5];
487  for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
488  coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
489  } else {
490  if (vp56_rac_get_prob_branchy(c, model2[4]))
491  coeff = 3 + vp56_rac_get_prob(c, model1[5]);
492  else
493  coeff = 2;
494  }
495  ct = 2;
496  } else {
497  ct = 1;
498  coeff = 1;
499  }
500  sign = vp56_rac_get(c);
501  coeff = (coeff ^ -sign) + sign;
502  if (coeff_idx)
503  coeff *= s->dequant_ac;
504  idx = model->coeff_index_to_pos[coeff_idx];
505  s->block_coeff[b][permute[idx]] = coeff;
506  run = 1;
507  } else {
508  /* parse a run */
509  ct = 0;
510  if (coeff_idx > 0) {
511  if (!vp56_rac_get_prob_branchy(c, model2[1]))
512  break;
513 
514  model3 = model->coeff_runv[coeff_idx >= 6];
515  run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
516  if (!run)
517  for (run=9, i=0; i<6; i++)
518  run += vp56_rac_get_prob(c, model3[i+8]) << i;
519  }
520  }
521  coeff_idx += run;
522  if (coeff_idx >= 64)
523  break;
524  cg = vp6_coeff_groups[coeff_idx];
525  model1 = model2 = model->coeff_ract[pt][ct][cg];
526  }
527 
528  s->left_block[ff_vp56_b6to4[b]].not_null_dc =
529  s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
530  }
531  return 0;
532 }
533 
534 static int vp6_block_variance(uint8_t *src, ptrdiff_t stride)
535 {
536  int sum = 0, square_sum = 0;
537  int y, x;
538 
539  for (y=0; y<8; y+=2) {
540  for (x=0; x<8; x+=2) {
541  sum += src[x];
542  square_sum += src[x]*src[x];
543  }
544  src += 2*stride;
545  }
546  return (16*square_sum - sum*sum) >> 8;
547 }
548 
549 static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, ptrdiff_t stride,
550  int delta, const int16_t *weights)
551 {
552  int x, y;
553 
554  for (y=0; y<8; y++) {
555  for (x=0; x<8; x++) {
556  dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
557  + src[x ] * weights[1]
558  + src[x+delta ] * weights[2]
559  + src[x+2*delta] * weights[3] + 64) >> 7);
560  }
561  src += stride;
562  dst += stride;
563  }
564 }
565 
566 static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
567  ptrdiff_t stride, int h_weight, int v_weight)
568 {
569  uint8_t *tmp = s->edge_emu_buffer+16;
570  s->h264chroma.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
571  s->h264chroma.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
572 }
573 
574 static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
575  int offset1, int offset2, ptrdiff_t stride,
576  VP56mv mv, int mask, int select, int luma)
577 {
578  int filter4 = 0;
579  int x8 = mv.x & mask;
580  int y8 = mv.y & mask;
581 
582  if (luma) {
583  x8 *= 2;
584  y8 *= 2;
585  filter4 = s->filter_mode;
586  if (filter4 == 2) {
587  if (s->max_vector_length &&
588  (FFABS(mv.x) > s->max_vector_length ||
589  FFABS(mv.y) > s->max_vector_length)) {
590  filter4 = 0;
591  } else if (s->sample_variance_threshold
592  && (vp6_block_variance(src+offset1, stride)
593  < s->sample_variance_threshold)) {
594  filter4 = 0;
595  }
596  }
597  }
598 
599  if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
600  offset1 = offset2;
601  }
602 
603  if (filter4) {
604  if (!y8) { /* left or right combine */
605  vp6_filter_hv4(dst, src+offset1, stride, 1,
606  vp6_block_copy_filter[select][x8]);
607  } else if (!x8) { /* above or below combine */
608  vp6_filter_hv4(dst, src+offset1, stride, stride,
609  vp6_block_copy_filter[select][y8]);
610  } else {
611  s->vp56dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
612  vp6_block_copy_filter[select][x8],
613  vp6_block_copy_filter[select][y8]);
614  }
615  } else {
616  if (!x8 || !y8) {
617  s->h264chroma.put_h264_chroma_pixels_tab[0](dst, src + offset1, stride, 8, x8, y8);
618  } else {
619  vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
620  }
621  }
622 }
623 
624 static av_cold void vp6_decode_init_context(VP56Context *s);
625 
627 {
628  VP56Context *s = avctx->priv_data;
629  int ret;
630 
631  if ((ret = ff_vp56_init(avctx, avctx->codec->id == AV_CODEC_ID_VP6,
632  avctx->codec->id == AV_CODEC_ID_VP6A)) < 0)
633  return ret;
634  ff_vp6dsp_init(&s->vp56dsp);
635 
637 
638  if (s->has_alpha) {
639  s->alpha_context = av_mallocz(sizeof(VP56Context));
640  ff_vp56_init_context(avctx, s->alpha_context,
641  s->flip == -1, s->has_alpha);
642  ff_vp6dsp_init(&s->alpha_context->vp56dsp);
643  vp6_decode_init_context(s->alpha_context);
644  }
645 
646  return 0;
647 }
648 
649 static av_cold void vp6_decode_init_context(VP56Context *s)
650 {
651  s->deblock_filtering = 0;
652  s->vp56_coord_div = vp6_coord_div;
653  s->parse_vector_adjustment = vp6_parse_vector_adjustment;
654  s->filter = vp6_filter;
655  s->default_models_init = vp6_default_models_init;
656  s->parse_vector_models = vp6_parse_vector_models;
657  s->parse_coeff_models = vp6_parse_coeff_models;
658  s->parse_header = vp6_parse_header;
659 }
660 
661 static av_cold void vp6_decode_free_context(VP56Context *s);
662 
664 {
665  VP56Context *s = avctx->priv_data;
666 
667  ff_vp56_free(avctx);
669 
670  if (s->alpha_context) {
671  ff_vp56_free_context(s->alpha_context);
672  vp6_decode_free_context(s->alpha_context);
673  av_freep(&s->alpha_context);
674  }
675 
676  return 0;
677 }
678 
679 static av_cold void vp6_decode_free_context(VP56Context *s)
680 {
681  int pt, ct, cg;
682 
683  for (pt=0; pt<2; pt++) {
684  ff_free_vlc(&s->dccv_vlc[pt]);
685  ff_free_vlc(&s->runv_vlc[pt]);
686  for (ct=0; ct<3; ct++)
687  for (cg=0; cg<6; cg++)
688  ff_free_vlc(&s->ract_vlc[pt][ct][cg]);
689  }
690 }
691 
693  .name = "vp6",
694  .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
695  .type = AVMEDIA_TYPE_VIDEO,
696  .id = AV_CODEC_ID_VP6,
697  .priv_data_size = sizeof(VP56Context),
699  .close = vp6_decode_free,
701  .capabilities = AV_CODEC_CAP_DR1,
702 };
703 
704 /* flash version, not flipped upside-down */
706  .name = "vp6f",
707  .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
708  .type = AVMEDIA_TYPE_VIDEO,
709  .id = AV_CODEC_ID_VP6F,
710  .priv_data_size = sizeof(VP56Context),
712  .close = vp6_decode_free,
714  .capabilities = AV_CODEC_CAP_DR1,
715 };
716 
717 /* flash version, not flipped upside-down, with alpha channel */
719  .name = "vp6a",
720  .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
721  .type = AVMEDIA_TYPE_VIDEO,
722  .id = AV_CODEC_ID_VP6A,
723  .priv_data_size = sizeof(VP56Context),
725  .close = vp6_decode_free,
728 };
av_cold int ff_vp56_free(AVCodecContext *avctx)
Definition: vp56.c:811
const struct AVCodec * codec
Definition: avcodec.h:1752
const char const char void * val
Definition: avisynth_c.h:771
static void vp6_coeff_order_table_init(VP56Context *s)
Definition: vp6.c:188
uint8_t coeff_ract[2][3][6][11]
Definition: vp56.h:114
static const uint8_t vp6_ract_pct[3][2][6][11]
Definition: vp6data.h:95
const char * s
Definition: avisynth_c.h:768
static av_cold int vp6_decode_init(AVCodecContext *avctx)
Definition: vp6.c:626
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define FF_HUFFMAN_FLAG_HNODE_FIRST
Definition: huffman.h:38
static const uint8_t vp6_runv_pct[2][14]
Definition: vp6data.h:90
static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[], const uint8_t *map, unsigned size, VLC *vlc)
Definition: vp6.c:248
uint8_t coeff_index_to_pos[64]
Definition: vp56.h:107
VP5 and VP6 compatible video decoder (common features)
static const int16_t vp6_block_copy_filter[17][8][4]
Definition: vp6data.h:151
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:261
static const uint8_t vp6_def_fdv_vector_model[2][8]
Definition: vp6data.h:33
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
const uint8_t ff_vp56_coeff_bias[]
Definition: vp56data.c:67
uint8_t coeff_dccv[2][11]
Definition: vp56.h:113
int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes, int nb_bits, Node *nodes, HuffCmp cmp, int flags)
nodes size must be 2*nb_codes first nb_codes nodes.count must be set
Definition: huffman.c:157
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
uint8_t mb_types_stats[3][10][2]
Definition: vp56.h:119
uint8_t vector_sig[2]
Definition: vp56.h:108
uint8_t vector_fdv[2][8]
Definition: vp56.h:112
static int vp6_parse_coeff(VP56Context *s)
Definition: vp6.c:453
static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src, ptrdiff_t stride, int h_weight, int v_weight)
Definition: vp6.c:566
const char * b
Definition: vf_curves.c:113
#define VP56_SIZE_CHANGE
Definition: vp56.h:71
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
uint8_t run
Definition: svq3.c:206
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
#define src
Definition: vp8dsp.c:254
static const uint8_t vp6_huff_coeff_map[]
Definition: vp6data.h:304
av_cold int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
Definition: vp56.c:752
AVCodec.
Definition: avcodec.h:3719
static av_cold void vp6_decode_free_context(VP56Context *s)
Definition: vp6.c:679
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
Definition: huffman.h:32
static const uint8_t vp6_def_runv_coeff_model[2][14]
Definition: vp6data.h:54
int16_t y
Definition: vp56.h:68
uint8_t
#define av_cold
Definition: attributes.h:82
float delta
static const uint8_t vp6_def_coeff_reorder[]
Definition: vp6data.h:43
static int vp6_parse_coeff_models(VP56Context *s)
Definition: vp6.c:270
av_cold int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s, int flip, int has_alpha)
Definition: vp56.c:758
#define VP6_MAX_HUFF_SIZE
Definition: vp6.c:41
int pt
Definition: rtp.c:35
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
static const uint8_t vp6_dccv_pct[2][11]
Definition: vp6data.h:74
static av_always_inline int vp56_rac_get_tree(VP56RangeCoder *c, const VP56Tree *tree, const uint8_t *probs)
Definition: vp56.h:365
uint8_t coeff_reorder[64]
Definition: vp56.h:106
#define FFALIGN(x, a)
Definition: macros.h:48
#define av_log(a,...)
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:587
enum AVCodecID id
Definition: avcodec.h:3733
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static const uint16_t mask[17]
Definition: lzw.c:38
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:179
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
Definition: vp56.h:289
const char * name
Name of the codec implementation.
Definition: avcodec.h:3726
void ff_vp56_init_dequant(VP56Context *s, int quantizer)
Definition: vp56.c:34
AVCodec ff_vp6_decoder
Definition: vp6.c:692
static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src, int offset1, int offset2, ptrdiff_t stride, VP56mv mv, int mask, int select, int luma)
Definition: vp6.c:574
const uint8_t ff_vp56_b6to4[]
Definition: vp56data.c:29
#define fail()
Definition: checkasm.h:90
Definition: vlc.h:26
const uint8_t * end
Definition: vp56.h:90
static int vp6_huff_cmp(const void *va, const void *vb)
Definition: vp6.c:242
static void vp6_parse_vector_models(VP56Context *s)
Definition: vp6.c:217
int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
Definition: vp56rac.c:40
VP5 and VP6 compatible video decoder (common data)
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
Definition: vp56.h:352
static av_cold void vp6_decode_init_context(VP56Context *s)
Definition: vp6.c:649
static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, ptrdiff_t stride, int delta, const int16_t *weights)
Definition: vp6.c:549
#define FF_HUFFMAN_BITS
Definition: huffman.h:40
AVCodec ff_vp6f_decoder
Definition: vp6.c:705
#define FFMIN(a, b)
Definition: common.h:96
VP6 compatible video decoder.
static void vp6_default_models_init(VP56Context *s)
Definition: vp6.c:199
static const uint8_t vp6_huff_run_map[]
Definition: vp6data.h:308
AVFormatContext * ctx
Definition: movenc.c:48
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vp56.c:544
const uint8_t ff_vp56_coeff_bit_length[]
Definition: vp56data.c:68
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
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:554
static int vp6_block_variance(uint8_t *src, ptrdiff_t stride)
Definition: vp6.c:534
#define vp56_rac_get_prob
Definition: vp56.h:254
static const VP56Tree vp6_pcr_tree[]
Definition: vp6data.h:290
uint8_t coeff_runv[2][14]
Definition: vp56.h:117
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
Definition: eamad.c:83
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AV_CODEC_CAP_SLICE_THREADS
Codec supports slice-based (or partition-based) multithreading.
Definition: avcodec.h:1065
static const int8_t mv[256][2]
Definition: 4xm.c:77
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
Definition: vp56.h:271
void ff_vp6dsp_init(VP56DSPContext *s)
Libavcodec external API header.
static const uint8_t vp6_coeff_reorder_pct[]
Definition: vp6data.h:79
const VP56Tree ff_vp56_pc_tree[]
Definition: vp56data.c:59
main external API structure.
Definition: avcodec.h:1743
static const uint8_t vp6_fdv_pct[2][8]
Definition: vp6data.h:69
static const uint8_t vp6_coord_div[]
Definition: vp6data.h:302
static void permute(uint8_t *dst, const uint8_t *src, const uint8_t permutation[64])
Definition: proresdec2.c:40
static unsigned vp6_get_nb_null(VP56Context *s)
Read number of consecutive blocks with null DC or AC.
Definition: vp6.c:381
static const uint8_t vp6_sig_dct_pct[2][2]
Definition: vp6data.h:59
void * buf
Definition: avisynth_c.h:690
const uint8_t ff_vp56_coeff_parse_table[6][11]
Definition: vp56data.c:31
int bits
Definition: vp56.h:87
uint8_t coeff_dcct[2][36][5]
Definition: vp56.h:116
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:313
static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
Definition: vp6.c:46
static av_cold int vp6_decode_free(AVCodecContext *avctx)
Definition: vp6.c:663
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:425
huffman tree builder and VLC generator
const VDPAUPixFmtMap * map
int16_t sym
Definition: huffman.h:33
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
Definition: vp56.h:66
av_cold int ff_vp56_free_context(VP56Context *s)
Definition: vp56.c:817
static const int vp6_dccv_lc[3][5][2]
Definition: vp6data.h:134
const VP56Tree ff_vp56_pva_tree[]
Definition: vp56data.c:49
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
int16_t x
Definition: vp56.h:67
common internal api header.
static double c[64]
static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
Definition: vp6.c:339
void * priv_data
Definition: avcodec.h:1785
static const uint8_t vp6_coeff_groups[]
Definition: vp6data.h:140
static const uint8_t vp6_def_pdv_vector_model[2][7]
Definition: vp6data.h:38
static int vp6_parse_coeff_huffman(VP56Context *s)
Definition: vp6.c:393
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
uint8_t vector_pdv[2][7]
Definition: vp56.h:111
static const double coeff[2][5]
Definition: vf_owdenoise.c:72
uint32_t count
Definition: huffman.h:35
const uint8_t * buffer
Definition: vp56.h:89
#define av_freep(p)
#define stride
const uint8_t ff_vp56_def_mb_types_stats[3][10][2]
Definition: vp56data.c:40
AVCodec ff_vp6a_decoder
Definition: vp6.c:718
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:354
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:998
static const uint8_t vp6_pdv_pct[2][7]
Definition: vp6data.h:64
uint8_t vector_dct[2]
Definition: vp56.h:109
static int vp56_rac_gets(VP56RangeCoder *c, int bits)
Definition: vp56.h:313
static uint8_t tmp[11]
Definition: aes_ctr.c:26