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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 separated_coeff = buf[0] & 1;
56 
57  s->frames[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
58  ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
59 
60  if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
61  sub_version = buf[1] >> 3;
62  if (sub_version > 8)
63  return AVERROR_INVALIDDATA;
64  s->filter_header = buf[1] & 0x06;
65  if (buf[1] & 1) {
66  avpriv_report_missing_feature(s->avctx, "Interlacing");
67  return AVERROR_PATCHWELCOME;
68  }
69  if (separated_coeff || !s->filter_header) {
70  coeff_offset = AV_RB16(buf+2) - 2;
71  buf += 2;
72  buf_size -= 2;
73  }
74 
75  rows = buf[2]; /* number of stored macroblock rows */
76  cols = buf[3]; /* number of stored macroblock cols */
77  /* buf[4] is number of displayed macroblock rows */
78  /* buf[5] is number of displayed macroblock cols */
79  if (!rows || !cols) {
80  av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n", cols << 4, rows << 4);
81  return AVERROR_INVALIDDATA;
82  }
83 
84  if (!s->macroblocks || /* first frame */
85  16*cols != s->avctx->coded_width ||
86  16*rows != s->avctx->coded_height) {
87  if (s->avctx->extradata_size == 0 &&
88  FFALIGN(s->avctx->width, 16) == 16 * cols &&
89  FFALIGN(s->avctx->height, 16) == 16 * rows) {
90  // We assume this is properly signalled container cropping,
91  // in an F4V file. Just set the coded_width/height, don't
92  // touch the cropped ones.
93  s->avctx->coded_width = 16 * cols;
94  s->avctx->coded_height = 16 * rows;
95  } else {
96  int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
97  if (ret < 0)
98  return ret;
99 
100  if (s->avctx->extradata_size == 1) {
101  s->avctx->width -= s->avctx->extradata[0] >> 4;
102  s->avctx->height -= s->avctx->extradata[0] & 0x0F;
103  }
104  }
105  res = VP56_SIZE_CHANGE;
106  }
107 
108  ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
109  vp56_rac_gets(c, 2);
110 
111  parse_filter_info = s->filter_header;
112  if (sub_version < 8)
113  vrt_shift = 5;
114  s->sub_version = sub_version;
115  s->golden_frame = 0;
116  } else {
117  if (!s->sub_version || !s->avctx->coded_width || !s->avctx->coded_height)
118  return AVERROR_INVALIDDATA;
119 
120  if (separated_coeff || !s->filter_header) {
121  coeff_offset = AV_RB16(buf+1) - 2;
122  buf += 2;
123  buf_size -= 2;
124  }
125  ff_vp56_init_range_decoder(c, buf+1, buf_size-1);
126 
127  s->golden_frame = vp56_rac_get(c);
128  if (s->filter_header) {
129  s->deblock_filtering = vp56_rac_get(c);
130  if (s->deblock_filtering)
131  vp56_rac_get(c);
132  if (s->sub_version > 7)
133  parse_filter_info = vp56_rac_get(c);
134  }
135  }
136 
137  if (parse_filter_info) {
138  if (vp56_rac_get(c)) {
139  s->filter_mode = 2;
140  s->sample_variance_threshold = vp56_rac_gets(c, 5) << vrt_shift;
141  s->max_vector_length = 2 << vp56_rac_gets(c, 3);
142  } else if (vp56_rac_get(c)) {
143  s->filter_mode = 1;
144  } else {
145  s->filter_mode = 0;
146  }
147  if (s->sub_version > 7)
148  s->filter_selection = vp56_rac_gets(c, 4);
149  else
150  s->filter_selection = 16;
151  }
152 
153  s->use_huffman = vp56_rac_get(c);
154 
155  s->parse_coeff = vp6_parse_coeff;
156  if (coeff_offset) {
157  buf += coeff_offset;
158  buf_size -= coeff_offset;
159  if (buf_size < 0) {
160  if (s->frames[VP56_FRAME_CURRENT]->key_frame)
161  ff_set_dimensions(s->avctx, 0, 0);
162  return AVERROR_INVALIDDATA;
163  }
164  if (s->use_huffman) {
165  s->parse_coeff = vp6_parse_coeff_huffman;
166  init_get_bits(&s->gb, buf, buf_size<<3);
167  } else {
168  ff_vp56_init_range_decoder(&s->cc, buf, buf_size);
169  s->ccp = &s->cc;
170  }
171  } else {
172  s->ccp = &s->c;
173  }
174 
175  return res;
176 }
177 
178 static void vp6_coeff_order_table_init(VP56Context *s)
179 {
180  int i, pos, idx = 1;
181 
182  s->modelp->coeff_index_to_pos[0] = 0;
183  for (i=0; i<16; i++)
184  for (pos=1; pos<64; pos++)
185  if (s->modelp->coeff_reorder[pos] == i)
186  s->modelp->coeff_index_to_pos[idx++] = pos;
187 }
188 
189 static void vp6_default_models_init(VP56Context *s)
190 {
191  VP56Model *model = s->modelp;
192 
193  model->vector_dct[0] = 0xA2;
194  model->vector_dct[1] = 0xA4;
195  model->vector_sig[0] = 0x80;
196  model->vector_sig[1] = 0x80;
197 
198  memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
199  memcpy(model->vector_fdv, vp6_def_fdv_vector_model, sizeof(model->vector_fdv));
200  memcpy(model->vector_pdv, vp6_def_pdv_vector_model, sizeof(model->vector_pdv));
201  memcpy(model->coeff_runv, vp6_def_runv_coeff_model, sizeof(model->coeff_runv));
202  memcpy(model->coeff_reorder, vp6_def_coeff_reorder, sizeof(model->coeff_reorder));
203 
205 }
206 
207 static void vp6_parse_vector_models(VP56Context *s)
208 {
209  VP56RangeCoder *c = &s->c;
210  VP56Model *model = s->modelp;
211  int comp, node;
212 
213  for (comp=0; comp<2; comp++) {
215  model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
217  model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
218  }
219 
220  for (comp=0; comp<2; comp++)
221  for (node=0; node<7; node++)
222  if (vp56_rac_get_prob_branchy(c, vp6_pdv_pct[comp][node]))
223  model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
224 
225  for (comp=0; comp<2; comp++)
226  for (node=0; node<8; node++)
227  if (vp56_rac_get_prob_branchy(c, vp6_fdv_pct[comp][node]))
228  model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
229 }
230 
231 /* nodes must ascend by count, but with descending symbol order */
232 static int vp6_huff_cmp(const void *va, const void *vb)
233 {
234  const Node *a = va, *b = vb;
235  return (a->count - b->count)*16 + (b->sym - a->sym);
236 }
237 
238 static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
239  const uint8_t *map, unsigned size, VLC *vlc)
240 {
241  Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
242  int a, b, i;
243 
244  /* first compute probabilities from model */
245  tmp[0].count = 256;
246  for (i=0; i<size-1; i++) {
247  a = tmp[i].count * coeff_model[i] >> 8;
248  b = tmp[i].count * (255 - coeff_model[i]) >> 8;
249  nodes[map[2*i ]].count = a + !a;
250  nodes[map[2*i+1]].count = b + !b;
251  }
252 
253  ff_free_vlc(vlc);
254  /* then build the huffman tree according to probabilities */
255  return ff_huff_build_tree(s->avctx, vlc, size, FF_HUFFMAN_BITS,
256  nodes, vp6_huff_cmp,
258 }
259 
260 static int vp6_parse_coeff_models(VP56Context *s)
261 {
262  VP56RangeCoder *c = &s->c;
263  VP56Model *model = s->modelp;
264  int def_prob[11];
265  int node, cg, ctx, pos;
266  int ct; /* code type */
267  int pt; /* plane type (0 for Y, 1 for U or V) */
268 
269  memset(def_prob, 0x80, sizeof(def_prob));
270 
271  for (pt=0; pt<2; pt++)
272  for (node=0; node<11; node++)
273  if (vp56_rac_get_prob_branchy(c, vp6_dccv_pct[pt][node])) {
274  def_prob[node] = vp56_rac_gets_nn(c, 7);
275  model->coeff_dccv[pt][node] = def_prob[node];
276  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
277  model->coeff_dccv[pt][node] = def_prob[node];
278  }
279 
280  if (vp56_rac_get(c)) {
281  for (pos=1; pos<64; pos++)
283  model->coeff_reorder[pos] = vp56_rac_gets(c, 4);
285  }
286 
287  for (cg=0; cg<2; cg++)
288  for (node=0; node<14; node++)
289  if (vp56_rac_get_prob_branchy(c, vp6_runv_pct[cg][node]))
290  model->coeff_runv[cg][node] = vp56_rac_gets_nn(c, 7);
291 
292  for (ct=0; ct<3; ct++)
293  for (pt=0; pt<2; pt++)
294  for (cg=0; cg<6; cg++)
295  for (node=0; node<11; node++)
296  if (vp56_rac_get_prob_branchy(c, vp6_ract_pct[ct][pt][cg][node])) {
297  def_prob[node] = vp56_rac_gets_nn(c, 7);
298  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
299  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
300  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
301  }
302 
303  if (s->use_huffman) {
304  for (pt=0; pt<2; pt++) {
305  if (vp6_build_huff_tree(s, model->coeff_dccv[pt],
306  vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]))
307  return -1;
308  if (vp6_build_huff_tree(s, model->coeff_runv[pt],
309  vp6_huff_run_map, 9, &s->runv_vlc[pt]))
310  return -1;
311  for (ct=0; ct<3; ct++)
312  for (cg = 0; cg < 6; cg++)
313  if (vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
314  vp6_huff_coeff_map, 12,
315  &s->ract_vlc[pt][ct][cg]))
316  return -1;
317  }
318  memset(s->nb_null, 0, sizeof(s->nb_null));
319  } else {
320  /* coeff_dcct is a linear combination of coeff_dccv */
321  for (pt=0; pt<2; pt++)
322  for (ctx=0; ctx<3; ctx++)
323  for (node=0; node<5; node++)
324  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);
325  }
326  return 0;
327 }
328 
329 static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
330 {
331  VP56RangeCoder *c = &s->c;
332  VP56Model *model = s->modelp;
333  int comp;
334 
335  *vect = (VP56mv) {0,0};
336  if (s->vector_candidate_pos < 2)
337  *vect = s->vector_candidate[0];
338 
339  for (comp=0; comp<2; comp++) {
340  int i, delta = 0;
341 
342  if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
343  static const uint8_t prob_order[] = {0, 1, 2, 7, 6, 5, 4};
344  for (i=0; i<sizeof(prob_order); i++) {
345  int j = prob_order[i];
346  delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][j])<<j;
347  }
348  if (delta & 0xF0)
349  delta |= vp56_rac_get_prob(c, model->vector_fdv[comp][3])<<3;
350  else
351  delta |= 8;
352  } else {
354  model->vector_pdv[comp]);
355  }
356 
357  if (delta && vp56_rac_get_prob_branchy(c, model->vector_sig[comp]))
358  delta = -delta;
359 
360  if (!comp)
361  vect->x += delta;
362  else
363  vect->y += delta;
364  }
365 }
366 
367 /**
368  * Read number of consecutive blocks with null DC or AC.
369  * This value is < 74.
370  */
371 static unsigned vp6_get_nb_null(VP56Context *s)
372 {
373  unsigned val = get_bits(&s->gb, 2);
374  if (val == 2)
375  val += get_bits(&s->gb, 2);
376  else if (val == 3) {
377  val = get_bits1(&s->gb) << 2;
378  val = 6+val + get_bits(&s->gb, 2+val);
379  }
380  return val;
381 }
382 
383 static int vp6_parse_coeff_huffman(VP56Context *s)
384 {
385  VP56Model *model = s->modelp;
386  uint8_t *permute = s->idct_scantable;
387  VLC *vlc_coeff;
388  int coeff, sign, coeff_idx;
389  int b, cg, idx;
390  int pt = 0; /* plane type (0 for Y, 1 for U or V) */
391 
392  for (b=0; b<6; b++) {
393  int ct = 0; /* code type */
394  if (b > 3) pt = 1;
395  vlc_coeff = &s->dccv_vlc[pt];
396 
397  for (coeff_idx = 0;;) {
398  int run = 1;
399  if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
400  s->nb_null[coeff_idx][pt]--;
401  if (coeff_idx)
402  break;
403  } else {
404  if (get_bits_left(&s->gb) <= 0)
405  return AVERROR_INVALIDDATA;
406  coeff = get_vlc2(&s->gb, vlc_coeff->table, FF_HUFFMAN_BITS, 3);
407  if (coeff == 0) {
408  if (coeff_idx) {
409  int pt = (coeff_idx >= 6);
410  run += get_vlc2(&s->gb, s->runv_vlc[pt].table, FF_HUFFMAN_BITS, 3);
411  if (run >= 9)
412  run += get_bits(&s->gb, 6);
413  } else
414  s->nb_null[0][pt] = vp6_get_nb_null(s);
415  ct = 0;
416  } else if (coeff == 11) { /* end of block */
417  if (coeff_idx == 1) /* first AC coeff ? */
418  s->nb_null[1][pt] = vp6_get_nb_null(s);
419  break;
420  } else {
421  int coeff2 = ff_vp56_coeff_bias[coeff];
422  if (coeff > 4)
423  coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
424  ct = 1 + (coeff2 > 1);
425  sign = get_bits1(&s->gb);
426  coeff2 = (coeff2 ^ -sign) + sign;
427  if (coeff_idx)
428  coeff2 *= s->dequant_ac;
429  idx = model->coeff_index_to_pos[coeff_idx];
430  s->block_coeff[b][permute[idx]] = coeff2;
431  }
432  }
433  coeff_idx+=run;
434  if (coeff_idx >= 64)
435  break;
436  cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
437  vlc_coeff = &s->ract_vlc[pt][ct][cg];
438  }
439  }
440  return 0;
441 }
442 
443 static int vp6_parse_coeff(VP56Context *s)
444 {
445  VP56RangeCoder *c = s->ccp;
446  VP56Model *model = s->modelp;
447  uint8_t *permute = s->idct_scantable;
448  uint8_t *model1, *model2, *model3;
449  int coeff, sign, coeff_idx;
450  int b, i, cg, idx, ctx;
451  int pt = 0; /* plane type (0 for Y, 1 for U or V) */
452 
453  if (c->end >= c->buffer && c->bits >= 0) {
454  av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp6_parse_coeff\n");
455  return AVERROR_INVALIDDATA;
456  }
457 
458  for (b=0; b<6; b++) {
459  int ct = 1; /* code type */
460  int run = 1;
461 
462  if (b > 3) pt = 1;
463 
464  ctx = s->left_block[ff_vp56_b6to4[b]].not_null_dc
465  + s->above_blocks[s->above_block_idx[b]].not_null_dc;
466  model1 = model->coeff_dccv[pt];
467  model2 = model->coeff_dcct[pt][ctx];
468 
469  coeff_idx = 0;
470  for (;;) {
471  if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob_branchy(c, model2[0])) {
472  /* parse a coeff */
473  if (vp56_rac_get_prob_branchy(c, model2[2])) {
474  if (vp56_rac_get_prob_branchy(c, model2[3])) {
475  idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
476  coeff = ff_vp56_coeff_bias[idx+5];
477  for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
478  coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
479  } else {
480  if (vp56_rac_get_prob_branchy(c, model2[4]))
481  coeff = 3 + vp56_rac_get_prob(c, model1[5]);
482  else
483  coeff = 2;
484  }
485  ct = 2;
486  } else {
487  ct = 1;
488  coeff = 1;
489  }
490  sign = vp56_rac_get(c);
491  coeff = (coeff ^ -sign) + sign;
492  if (coeff_idx)
493  coeff *= s->dequant_ac;
494  idx = model->coeff_index_to_pos[coeff_idx];
495  s->block_coeff[b][permute[idx]] = coeff;
496  run = 1;
497  } else {
498  /* parse a run */
499  ct = 0;
500  if (coeff_idx > 0) {
501  if (!vp56_rac_get_prob_branchy(c, model2[1]))
502  break;
503 
504  model3 = model->coeff_runv[coeff_idx >= 6];
505  run = vp56_rac_get_tree(c, vp6_pcr_tree, model3);
506  if (!run)
507  for (run=9, i=0; i<6; i++)
508  run += vp56_rac_get_prob(c, model3[i+8]) << i;
509  }
510  }
511  coeff_idx += run;
512  if (coeff_idx >= 64)
513  break;
514  cg = vp6_coeff_groups[coeff_idx];
515  model1 = model2 = model->coeff_ract[pt][ct][cg];
516  }
517 
518  s->left_block[ff_vp56_b6to4[b]].not_null_dc =
519  s->above_blocks[s->above_block_idx[b]].not_null_dc = !!s->block_coeff[b][0];
520  }
521  return 0;
522 }
523 
525 {
526  int sum = 0, square_sum = 0;
527  int y, x;
528 
529  for (y=0; y<8; y+=2) {
530  for (x=0; x<8; x+=2) {
531  sum += src[x];
532  square_sum += src[x]*src[x];
533  }
534  src += 2*stride;
535  }
536  return (16*square_sum - sum*sum) >> 8;
537 }
538 
539 static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride,
540  int delta, const int16_t *weights)
541 {
542  int x, y;
543 
544  for (y=0; y<8; y++) {
545  for (x=0; x<8; x++) {
546  dst[x] = av_clip_uint8(( src[x-delta ] * weights[0]
547  + src[x ] * weights[1]
548  + src[x+delta ] * weights[2]
549  + src[x+2*delta] * weights[3] + 64) >> 7);
550  }
551  src += stride;
552  dst += stride;
553  }
554 }
555 
556 static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
557  int stride, int h_weight, int v_weight)
558 {
559  uint8_t *tmp = s->edge_emu_buffer+16;
560  s->h264chroma.put_h264_chroma_pixels_tab[0](tmp, src, stride, 9, h_weight, 0);
561  s->h264chroma.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
562 }
563 
564 static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
565  int offset1, int offset2, int stride,
566  VP56mv mv, int mask, int select, int luma)
567 {
568  int filter4 = 0;
569  int x8 = mv.x & mask;
570  int y8 = mv.y & mask;
571 
572  if (luma) {
573  x8 *= 2;
574  y8 *= 2;
575  filter4 = s->filter_mode;
576  if (filter4 == 2) {
577  if (s->max_vector_length &&
578  (FFABS(mv.x) > s->max_vector_length ||
579  FFABS(mv.y) > s->max_vector_length)) {
580  filter4 = 0;
581  } else if (s->sample_variance_threshold
582  && (vp6_block_variance(src+offset1, stride)
583  < s->sample_variance_threshold)) {
584  filter4 = 0;
585  }
586  }
587  }
588 
589  if ((y8 && (offset2-offset1)*s->flip<0) || (!y8 && offset1 > offset2)) {
590  offset1 = offset2;
591  }
592 
593  if (filter4) {
594  if (!y8) { /* left or right combine */
595  vp6_filter_hv4(dst, src+offset1, stride, 1,
596  vp6_block_copy_filter[select][x8]);
597  } else if (!x8) { /* above or below combine */
598  vp6_filter_hv4(dst, src+offset1, stride, stride,
599  vp6_block_copy_filter[select][y8]);
600  } else {
601  s->vp56dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
602  vp6_block_copy_filter[select][x8],
603  vp6_block_copy_filter[select][y8]);
604  }
605  } else {
606  if (!x8 || !y8) {
607  s->h264chroma.put_h264_chroma_pixels_tab[0](dst, src + offset1, stride, 8, x8, y8);
608  } else {
609  vp6_filter_diag2(s, dst, src+offset1 + ((mv.x^mv.y)>>31), stride, x8, y8);
610  }
611  }
612 }
613 
614 static av_cold void vp6_decode_init_context(VP56Context *s);
615 
617 {
618  VP56Context *s = avctx->priv_data;
619  int ret;
620 
621  if ((ret = ff_vp56_init(avctx, avctx->codec->id == AV_CODEC_ID_VP6,
622  avctx->codec->id == AV_CODEC_ID_VP6A)) < 0)
623  return ret;
624 
626 
627  if (s->has_alpha) {
628  s->alpha_context = av_mallocz(sizeof(VP56Context));
629  ff_vp56_init_context(avctx, s->alpha_context,
630  s->flip == -1, s->has_alpha);
631  vp6_decode_init_context(s->alpha_context);
632  }
633 
634  return 0;
635 }
636 
637 static av_cold void vp6_decode_init_context(VP56Context *s)
638 {
639  s->deblock_filtering = 0;
640  s->vp56_coord_div = vp6_coord_div;
641  s->parse_vector_adjustment = vp6_parse_vector_adjustment;
642  s->filter = vp6_filter;
643  s->default_models_init = vp6_default_models_init;
644  s->parse_vector_models = vp6_parse_vector_models;
645  s->parse_coeff_models = vp6_parse_coeff_models;
646  s->parse_header = vp6_parse_header;
647 }
648 
649 static av_cold void vp6_decode_free_context(VP56Context *s);
650 
652 {
653  VP56Context *s = avctx->priv_data;
654 
655  ff_vp56_free(avctx);
657 
658  if (s->alpha_context) {
659  ff_vp56_free_context(s->alpha_context);
660  vp6_decode_free_context(s->alpha_context);
661  av_freep(&s->alpha_context);
662  }
663 
664  return 0;
665 }
666 
667 static av_cold void vp6_decode_free_context(VP56Context *s)
668 {
669  int pt, ct, cg;
670 
671  for (pt=0; pt<2; pt++) {
672  ff_free_vlc(&s->dccv_vlc[pt]);
673  ff_free_vlc(&s->runv_vlc[pt]);
674  for (ct=0; ct<3; ct++)
675  for (cg=0; cg<6; cg++)
676  ff_free_vlc(&s->ract_vlc[pt][ct][cg]);
677  }
678 }
679 
681  .name = "vp6",
682  .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
683  .type = AVMEDIA_TYPE_VIDEO,
684  .id = AV_CODEC_ID_VP6,
685  .priv_data_size = sizeof(VP56Context),
687  .close = vp6_decode_free,
689  .capabilities = AV_CODEC_CAP_DR1,
690 };
691 
692 /* flash version, not flipped upside-down */
694  .name = "vp6f",
695  .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
696  .type = AVMEDIA_TYPE_VIDEO,
697  .id = AV_CODEC_ID_VP6F,
698  .priv_data_size = sizeof(VP56Context),
700  .close = vp6_decode_free,
702  .capabilities = AV_CODEC_CAP_DR1,
703 };
704 
705 /* flash version, not flipped upside-down, with alpha channel */
707  .name = "vp6a",
708  .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
709  .type = AVMEDIA_TYPE_VIDEO,
710  .id = AV_CODEC_ID_VP6A,
711  .priv_data_size = sizeof(VP56Context),
713  .close = vp6_decode_free,
716 };
av_cold int ff_vp56_free(AVCodecContext *avctx)
Definition: vp56.c:749
const struct AVCodec * codec
Definition: avcodec.h:1700
const char const char void * val
Definition: avisynth_c.h:771
static void vp6_coeff_order_table_init(VP56Context *s)
Definition: vp6.c:178
uint8_t coeff_ract[2][3][6][11]
Definition: vp56.h:113
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:616
#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:238
uint8_t coeff_index_to_pos[64]
Definition: vp56.h:106
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:210
const uint8_t ff_vp56_coeff_bias[]
Definition: vp56data.c:67
uint8_t coeff_dccv[2][11]
Definition: vp56.h:112
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:118
uint8_t vector_sig[2]
Definition: vp56.h:107
uint8_t vector_fdv[2][8]
Definition: vp56.h:111
static int vp6_parse_coeff(VP56Context *s)
Definition: vp6.c:443
const char * b
Definition: vf_curves.c:113
#define VP56_SIZE_CHANGE
Definition: vp56.h:70
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
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:689
AVCodec.
Definition: avcodec.h:3646
static av_cold void vp6_decode_free_context(VP56Context *s)
Definition: vp6.c:667
static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src, int offset1, int offset2, int stride, VP56mv mv, int mask, int select, int luma)
Definition: vp6.c:564
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:67
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:260
av_cold int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s, int flip, int has_alpha)
Definition: vp56.c:695
#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:361
uint8_t coeff_reorder[64]
Definition: vp56.h:105
#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:3660
#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:180
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
Definition: vp56.h:285
const char * name
Name of the codec implementation.
Definition: avcodec.h:3653
void ff_vp56_init_dequant(VP56Context *s, int quantizer)
Definition: vp56.c:34
AVCodec ff_vp6_decoder
Definition: vp6.c:680
const uint8_t ff_vp56_b6to4[]
Definition: vp56data.c:29
Definition: vlc.h:26
const uint8_t * end
Definition: vp56.h:89
static int vp6_huff_cmp(const void *va, const void *vb)
Definition: vp6.c:232
static void vp6_parse_vector_models(VP56Context *s)
Definition: vp6.c:207
VP5 and VP6 compatible video decoder (common data)
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
Definition: vp56.h:348
static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src, int stride, int h_weight, int v_weight)
Definition: vp6.c:556
static av_cold void vp6_decode_init_context(VP56Context *s)
Definition: vp6.c:637
#define FF_HUFFMAN_BITS
Definition: huffman.h:40
AVCodec ff_vp6f_decoder
Definition: vp6.c:693
#define FFMIN(a, b)
Definition: common.h:96
VP6 compatible video decoder.
static void vp6_default_models_init(VP56Context *s)
Definition: vp6.c:189
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:503
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
#define vp56_rac_get_prob
Definition: vp56.h:250
static const VP56Tree vp6_pcr_tree[]
Definition: vp6data.h:290
static void vp6_filter_hv4(uint8_t *dst, uint8_t *src, int stride, int delta, const int16_t *weights)
Definition: vp6.c:539
uint8_t coeff_runv[2][14]
Definition: vp56.h:116
#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:1035
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:267
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:1691
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:371
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:86
uint8_t coeff_dcct[2][36][5]
Definition: vp56.h:115
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:651
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.
void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
Definition: vp56rac.c:40
Definition: vp56.h:65
av_cold int ff_vp56_free_context(VP56Context *s)
Definition: vp56.c:755
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:66
common internal api header.
static double c[64]
static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
Definition: vp6.c:329
void * priv_data
Definition: avcodec.h:1733
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:383
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
uint8_t vector_pdv[2][7]
Definition: vp56.h:110
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:88
#define av_freep(p)
static void comp(unsigned char *dst, int dst_stride, unsigned char *src, int src_stride, int add)
Definition: eamad.c:83
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2045
#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:706
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:968
static const uint8_t vp6_pdv_pct[2][7]
Definition: vp6data.h:64
uint8_t vector_dct[2]
Definition: vp56.h:108
static int vp56_rac_gets(VP56RangeCoder *c, int bits)
Definition: vp56.h:309
static int vp6_block_variance(uint8_t *src, int stride)
Definition: vp6.c:524
static uint8_t tmp[11]
Definition: aes_ctr.c:26