FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
vp56.c
Go to the documentation of this file.
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  * VP5 and VP6 compatible video decoder (common features)
24  */
25 
26 #include "avcodec.h"
27 #include "bytestream.h"
28 #include "internal.h"
29 
30 #include "vp56.h"
31 #include "vp56data.h"
32 
33 
34 void ff_vp56_init_dequant(VP56Context *s, int quantizer)
35 {
36  s->quantizer = quantizer;
37  s->dequant_dc = vp56_dc_dequant[quantizer] << 2;
38  s->dequant_ac = vp56_ac_dequant[quantizer] << 2;
39  memset(s->qscale_table, quantizer, s->mb_width);
40 }
41 
42 static int vp56_get_vectors_predictors(VP56Context *s, int row, int col,
43  VP56Frame ref_frame)
44 {
45  int nb_pred = 0;
46  VP56mv vect[2] = {{0,0}, {0,0}};
47  int pos, offset;
48  VP56mv mvp;
49 
50  for (pos=0; pos<12; pos++) {
51  mvp.x = col + vp56_candidate_predictor_pos[pos][0];
52  mvp.y = row + vp56_candidate_predictor_pos[pos][1];
53  if (mvp.x < 0 || mvp.x >= s->mb_width ||
54  mvp.y < 0 || mvp.y >= s->mb_height)
55  continue;
56  offset = mvp.x + s->mb_width*mvp.y;
57 
58  if (vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)
59  continue;
60  if ((s->macroblocks[offset].mv.x == vect[0].x &&
61  s->macroblocks[offset].mv.y == vect[0].y) ||
62  (s->macroblocks[offset].mv.x == 0 &&
63  s->macroblocks[offset].mv.y == 0))
64  continue;
65 
66  vect[nb_pred++] = s->macroblocks[offset].mv;
67  if (nb_pred > 1) {
68  nb_pred = -1;
69  break;
70  }
71  s->vector_candidate_pos = pos;
72  }
73 
74  s->vector_candidate[0] = vect[0];
75  s->vector_candidate[1] = vect[1];
76 
77  return nb_pred+1;
78 }
79 
80 static void vp56_parse_mb_type_models(VP56Context *s)
81 {
82  VP56RangeCoder *c = &s->c;
83  VP56Model *model = s->modelp;
84  int i, ctx, type;
85 
86  for (ctx=0; ctx<3; ctx++) {
87  if (vp56_rac_get_prob(c, 174)) {
88  int idx = vp56_rac_gets(c, 4);
89  memcpy(model->mb_types_stats[ctx],
90  vp56_pre_def_mb_type_stats[idx][ctx],
91  sizeof(model->mb_types_stats[ctx]));
92  }
93  if (vp56_rac_get_prob(c, 254)) {
94  for (type=0; type<10; type++) {
95  for(i=0; i<2; i++) {
96  if (vp56_rac_get_prob(c, 205)) {
97  int delta, sign = vp56_rac_get(c);
98 
99  delta = vp56_rac_get_tree(c, vp56_pmbtm_tree,
100  vp56_mb_type_model_model);
101  if (!delta)
102  delta = 4 * vp56_rac_gets(c, 7);
103  model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
104  }
105  }
106  }
107  }
108  }
109 
110  /* compute MB type probability tables based on previous MB type */
111  for (ctx=0; ctx<3; ctx++) {
112  int p[10];
113 
114  for (type=0; type<10; type++)
115  p[type] = 100 * model->mb_types_stats[ctx][type][1];
116 
117  for (type=0; type<10; type++) {
118  int p02, p34, p0234, p17, p56, p89, p5689, p156789;
119 
120  /* conservative MB type probability */
121  model->mb_type[ctx][type][0] = 255 - (255 * model->mb_types_stats[ctx][type][0]) / (1 + model->mb_types_stats[ctx][type][0] + model->mb_types_stats[ctx][type][1]);
122 
123  p[type] = 0; /* same MB type => weight is null */
124 
125  /* binary tree parsing probabilities */
126  p02 = p[0] + p[2];
127  p34 = p[3] + p[4];
128  p0234 = p02 + p34;
129  p17 = p[1] + p[7];
130  p56 = p[5] + p[6];
131  p89 = p[8] + p[9];
132  p5689 = p56 + p89;
133  p156789 = p17 + p5689;
134 
135  model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
136  model->mb_type[ctx][type][2] = 1 + 255 * p02 / (1+p0234);
137  model->mb_type[ctx][type][3] = 1 + 255 * p17 / (1+p156789);
138  model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
139  model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
140  model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
141  model->mb_type[ctx][type][7] = 1 + 255 * p56 / (1+p5689);
142  model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
143  model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
144 
145  /* restore initial value */
146  p[type] = 100 * model->mb_types_stats[ctx][type][1];
147  }
148  }
149 }
150 
151 static VP56mb vp56_parse_mb_type(VP56Context *s,
152  VP56mb prev_type, int ctx)
153 {
154  uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];
155  VP56RangeCoder *c = &s->c;
156 
157  if (vp56_rac_get_prob(c, mb_type_model[0]))
158  return prev_type;
159  else
160  return vp56_rac_get_tree(c, vp56_pmbt_tree, mb_type_model);
161 }
162 
163 static void vp56_decode_4mv(VP56Context *s, int row, int col)
164 {
165  VP56mv mv = {0,0};
166  int type[4];
167  int b;
168 
169  /* parse each block type */
170  for (b=0; b<4; b++) {
171  type[b] = vp56_rac_gets(&s->c, 2);
172  if (type[b])
173  type[b]++; /* only returns 0, 2, 3 or 4 (all INTER_PF) */
174  }
175 
176  /* get vectors */
177  for (b=0; b<4; b++) {
178  switch (type[b]) {
179  case VP56_MB_INTER_NOVEC_PF:
180  s->mv[b] = (VP56mv) {0,0};
181  break;
182  case VP56_MB_INTER_DELTA_PF:
183  s->parse_vector_adjustment(s, &s->mv[b]);
184  break;
185  case VP56_MB_INTER_V1_PF:
186  s->mv[b] = s->vector_candidate[0];
187  break;
188  case VP56_MB_INTER_V2_PF:
189  s->mv[b] = s->vector_candidate[1];
190  break;
191  }
192  mv.x += s->mv[b].x;
193  mv.y += s->mv[b].y;
194  }
195 
196  /* this is the one selected for the whole MB for prediction */
197  s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
198 
199  /* chroma vectors are average luma vectors */
200  if (s->avctx->codec->id == AV_CODEC_ID_VP5) {
201  s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
202  s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
203  } else {
204  s->mv[4] = s->mv[5] = (VP56mv) {mv.x/4, mv.y/4};
205  }
206 }
207 
208 static VP56mb vp56_decode_mv(VP56Context *s, int row, int col)
209 {
210  VP56mv *mv, vect = {0,0};
211  int ctx, b;
212 
213  ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);
214  s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);
215  s->macroblocks[row * s->mb_width + col].type = s->mb_type;
216 
217  switch (s->mb_type) {
218  case VP56_MB_INTER_V1_PF:
219  mv = &s->vector_candidate[0];
220  break;
221 
222  case VP56_MB_INTER_V2_PF:
223  mv = &s->vector_candidate[1];
224  break;
225 
226  case VP56_MB_INTER_V1_GF:
227  vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
228  mv = &s->vector_candidate[0];
229  break;
230 
231  case VP56_MB_INTER_V2_GF:
232  vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
233  mv = &s->vector_candidate[1];
234  break;
235 
236  case VP56_MB_INTER_DELTA_PF:
237  s->parse_vector_adjustment(s, &vect);
238  mv = &vect;
239  break;
240 
241  case VP56_MB_INTER_DELTA_GF:
242  vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
243  s->parse_vector_adjustment(s, &vect);
244  mv = &vect;
245  break;
246 
247  case VP56_MB_INTER_4V:
248  vp56_decode_4mv(s, row, col);
249  return s->mb_type;
250 
251  default:
252  mv = &vect;
253  break;
254  }
255 
256  s->macroblocks[row*s->mb_width + col].mv = *mv;
257 
258  /* same vector for all blocks */
259  for (b=0; b<6; b++)
260  s->mv[b] = *mv;
261 
262  return s->mb_type;
263 }
264 
265 static void vp56_add_predictors_dc(VP56Context *s, VP56Frame ref_frame)
266 {
267  int idx = s->scantable.permutated[0];
268  int b;
269 
270  for (b=0; b<6; b++) {
271  VP56RefDc *ab = &s->above_blocks[s->above_block_idx[b]];
272  VP56RefDc *lb = &s->left_block[ff_vp56_b6to4[b]];
273  int count = 0;
274  int dc = 0;
275  int i;
276 
277  if (ref_frame == lb->ref_frame) {
278  dc += lb->dc_coeff;
279  count++;
280  }
281  if (ref_frame == ab->ref_frame) {
282  dc += ab->dc_coeff;
283  count++;
284  }
285  if (s->avctx->codec->id == AV_CODEC_ID_VP5)
286  for (i=0; i<2; i++)
287  if (count < 2 && ref_frame == ab[-1+2*i].ref_frame) {
288  dc += ab[-1+2*i].dc_coeff;
289  count++;
290  }
291  if (count == 0)
292  dc = s->prev_dc[ff_vp56_b2p[b]][ref_frame];
293  else if (count == 2)
294  dc /= 2;
295 
296  s->block_coeff[b][idx] += dc;
297  s->prev_dc[ff_vp56_b2p[b]][ref_frame] = s->block_coeff[b][idx];
298  ab->dc_coeff = s->block_coeff[b][idx];
299  ab->ref_frame = ref_frame;
300  lb->dc_coeff = s->block_coeff[b][idx];
301  lb->ref_frame = ref_frame;
302  s->block_coeff[b][idx] *= s->dequant_dc;
303  }
304 }
305 
306 static void vp56_deblock_filter(VP56Context *s, uint8_t *yuv,
307  int stride, int dx, int dy)
308 {
309  int t = vp56_filter_threshold[s->quantizer];
310  if (dx) s->vp56dsp.edge_filter_hor(yuv + 10-dx , stride, t);
311  if (dy) s->vp56dsp.edge_filter_ver(yuv + stride*(10-dy), stride, t);
312 }
313 
314 static void vp56_mc(VP56Context *s, int b, int plane, uint8_t *src,
315  int stride, int x, int y)
316 {
317  uint8_t *dst=s->framep[VP56_FRAME_CURRENT]->data[plane]+s->block_offset[b];
318  uint8_t *src_block;
319  int src_offset;
320  int overlap_offset = 0;
321  int mask = s->vp56_coord_div[b] - 1;
322  int deblock_filtering = s->deblock_filtering;
323  int dx;
324  int dy;
325 
326  if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
327  (s->avctx->skip_loop_filter >= AVDISCARD_NONKEY
328  && !s->framep[VP56_FRAME_CURRENT]->key_frame))
329  deblock_filtering = 0;
330 
331  dx = s->mv[b].x / s->vp56_coord_div[b];
332  dy = s->mv[b].y / s->vp56_coord_div[b];
333 
334  if (b >= 4) {
335  x /= 2;
336  y /= 2;
337  }
338  x += dx - 2;
339  y += dy - 2;
340 
341  if (x<0 || x+12>=s->plane_width[plane] ||
342  y<0 || y+12>=s->plane_height[plane]) {
343  s->vdsp.emulated_edge_mc(s->edge_emu_buffer,
344  src + s->block_offset[b] + (dy-2)*stride + (dx-2),
345  stride, 12, 12, x, y,
346  s->plane_width[plane],
347  s->plane_height[plane]);
348  src_block = s->edge_emu_buffer;
349  src_offset = 2 + 2*stride;
350  } else if (deblock_filtering) {
351  /* only need a 12x12 block, but there is no such dsp function, */
352  /* so copy a 16x12 block */
353  s->dsp.put_pixels_tab[0][0](s->edge_emu_buffer,
354  src + s->block_offset[b] + (dy-2)*stride + (dx-2),
355  stride, 12);
356  src_block = s->edge_emu_buffer;
357  src_offset = 2 + 2*stride;
358  } else {
359  src_block = src;
360  src_offset = s->block_offset[b] + dy*stride + dx;
361  }
362 
363  if (deblock_filtering)
364  vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);
365 
366  if (s->mv[b].x & mask)
367  overlap_offset += (s->mv[b].x > 0) ? 1 : -1;
368  if (s->mv[b].y & mask)
369  overlap_offset += (s->mv[b].y > 0) ? stride : -stride;
370 
371  if (overlap_offset) {
372  if (s->filter)
373  s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,
374  stride, s->mv[b], mask, s->filter_selection, b<4);
375  else
376  s->dsp.put_no_rnd_pixels_l2[1](dst, src_block+src_offset,
377  src_block+src_offset+overlap_offset,
378  stride, 8);
379  } else {
380  s->dsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);
381  }
382 }
383 
384 static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
385 {
386  AVFrame *frame_current, *frame_ref;
387  VP56mb mb_type;
388  VP56Frame ref_frame;
389  int b, ab, b_max, plane, off;
390 
391  if (s->framep[VP56_FRAME_CURRENT]->key_frame)
392  mb_type = VP56_MB_INTRA;
393  else
394  mb_type = vp56_decode_mv(s, row, col);
395  ref_frame = vp56_reference_frame[mb_type];
396 
397  s->dsp.clear_blocks(*s->block_coeff);
398 
399  s->parse_coeff(s);
400 
401  vp56_add_predictors_dc(s, ref_frame);
402 
403  frame_current = s->framep[VP56_FRAME_CURRENT];
404  frame_ref = s->framep[ref_frame];
405  if (mb_type != VP56_MB_INTRA && !frame_ref->data[0])
406  return;
407 
408  ab = 6*is_alpha;
409  b_max = 6 - 2*is_alpha;
410 
411  switch (mb_type) {
412  case VP56_MB_INTRA:
413  for (b=0; b<b_max; b++) {
414  plane = ff_vp56_b2p[b+ab];
415  s->vp3dsp.idct_put(frame_current->data[plane] + s->block_offset[b],
416  s->stride[plane], s->block_coeff[b]);
417  }
418  break;
419 
420  case VP56_MB_INTER_NOVEC_PF:
421  case VP56_MB_INTER_NOVEC_GF:
422  for (b=0; b<b_max; b++) {
423  plane = ff_vp56_b2p[b+ab];
424  off = s->block_offset[b];
425  s->dsp.put_pixels_tab[1][0](frame_current->data[plane] + off,
426  frame_ref->data[plane] + off,
427  s->stride[plane], 8);
428  s->vp3dsp.idct_add(frame_current->data[plane] + off,
429  s->stride[plane], s->block_coeff[b]);
430  }
431  break;
432 
433  case VP56_MB_INTER_DELTA_PF:
434  case VP56_MB_INTER_V1_PF:
435  case VP56_MB_INTER_V2_PF:
436  case VP56_MB_INTER_DELTA_GF:
437  case VP56_MB_INTER_4V:
438  case VP56_MB_INTER_V1_GF:
439  case VP56_MB_INTER_V2_GF:
440  for (b=0; b<b_max; b++) {
441  int x_off = b==1 || b==3 ? 8 : 0;
442  int y_off = b==2 || b==3 ? 8 : 0;
443  plane = ff_vp56_b2p[b+ab];
444  vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],
445  16*col+x_off, 16*row+y_off);
446  s->vp3dsp.idct_add(frame_current->data[plane] + s->block_offset[b],
447  s->stride[plane], s->block_coeff[b]);
448  }
449  break;
450  }
451 }
452 
453 static int vp56_size_changed(VP56Context *s)
454 {
455  AVCodecContext *avctx = s->avctx;
456  int stride = s->framep[VP56_FRAME_CURRENT]->linesize[0];
457  int i;
458 
459  s->plane_width[0] = s->plane_width[3] = avctx->coded_width;
460  s->plane_width[1] = s->plane_width[2] = avctx->coded_width/2;
461  s->plane_height[0] = s->plane_height[3] = avctx->coded_height;
462  s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;
463 
464  for (i=0; i<4; i++)
465  s->stride[i] = s->flip * s->framep[VP56_FRAME_CURRENT]->linesize[i];
466 
467  s->mb_width = (avctx->coded_width +15) / 16;
468  s->mb_height = (avctx->coded_height+15) / 16;
469 
470  if (s->mb_width > 1000 || s->mb_height > 1000) {
471  avcodec_set_dimensions(avctx, 0, 0);
472  av_log(avctx, AV_LOG_ERROR, "picture too big\n");
473  return -1;
474  }
475 
476  s->qscale_table = av_realloc(s->qscale_table, s->mb_width);
477  s->above_blocks = av_realloc(s->above_blocks,
478  (4*s->mb_width+6) * sizeof(*s->above_blocks));
479  s->macroblocks = av_realloc(s->macroblocks,
480  s->mb_width*s->mb_height*sizeof(*s->macroblocks));
481  av_free(s->edge_emu_buffer_alloc);
482  s->edge_emu_buffer_alloc = av_malloc(16*stride);
483  s->edge_emu_buffer = s->edge_emu_buffer_alloc;
484  if (s->flip < 0)
485  s->edge_emu_buffer += 15 * stride;
486 
487  if (s->alpha_context)
488  return vp56_size_changed(s->alpha_context);
489 
490  return 0;
491 }
492 
493 static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *, int, int);
494 
495 int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
496  AVPacket *avpkt)
497 {
498  const uint8_t *buf = avpkt->data;
499  VP56Context *s = avctx->priv_data;
500  AVFrame *p = 0;
501  int remaining_buf_size = avpkt->size;
502  int av_uninit(alpha_offset);
503  int i, res;
504 
505  /* select a current frame from the unused frames */
506  for (i = 0; i < 4; ++i) {
507  if (!s->frames[i].data[0]) {
508  p = &s->frames[i];
509  break;
510  }
511  }
512  av_assert0(p != 0);
513  s->framep[VP56_FRAME_CURRENT] = p;
514  if (s->alpha_context)
515  s->alpha_context->framep[VP56_FRAME_CURRENT] = p;
516 
517  if (s->has_alpha) {
518  if (remaining_buf_size < 3)
519  return -1;
520  alpha_offset = bytestream_get_be24(&buf);
521  remaining_buf_size -= 3;
522  if (remaining_buf_size < alpha_offset)
523  return -1;
524  }
525 
526  res = s->parse_header(s, buf, remaining_buf_size);
527  if (res < 0)
528  return res;
529 
530  if (res == VP56_SIZE_CHANGE) {
531  for (i = 0; i < 4; i++) {
532  if (s->frames[i].data[0])
533  avctx->release_buffer(avctx, &s->frames[i]);
534  }
535  }
536 
537  p->reference = 3;
538  if (ff_get_buffer(avctx, p) < 0) {
539  av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
540  return -1;
541  }
542 
543  if (res == VP56_SIZE_CHANGE) {
544  if (vp56_size_changed(s)) {
545  avctx->release_buffer(avctx, p);
546  return -1;
547  }
548  }
549 
550  if (s->has_alpha) {
551  int bak_w = avctx->width;
552  int bak_h = avctx->height;
553  int bak_cw = avctx->coded_width;
554  int bak_ch = avctx->coded_height;
555  buf += alpha_offset;
556  remaining_buf_size -= alpha_offset;
557 
558  res = s->alpha_context->parse_header(s->alpha_context, buf, remaining_buf_size);
559  if (res != 0) {
560  if(res==VP56_SIZE_CHANGE) {
561  av_log(avctx, AV_LOG_ERROR, "Alpha reconfiguration\n");
562  avctx->width = bak_w;
563  avctx->height = bak_h;
564  avctx->coded_width = bak_cw;
565  avctx->coded_height = bak_ch;
566  }
567  avctx->release_buffer(avctx, p);
568  return -1;
569  }
570  }
571 
572  avctx->execute2(avctx, ff_vp56_decode_mbs, 0, 0, s->has_alpha + 1);
573 
574  /* release frames that aren't in use */
575  for (i = 0; i < 4; ++i) {
576  AVFrame *victim = &s->frames[i];
577  if (!victim->data[0])
578  continue;
579  if (victim != s->framep[VP56_FRAME_PREVIOUS] &&
580  victim != s->framep[VP56_FRAME_GOLDEN] &&
581  (!s->has_alpha || victim != s->alpha_context->framep[VP56_FRAME_GOLDEN]))
582  avctx->release_buffer(avctx, victim);
583  }
584 
585  p->qstride = 0;
586  p->qscale_table = s->qscale_table;
587  p->qscale_type = FF_QSCALE_TYPE_VP56;
588  *(AVFrame*)data = *p;
589  *got_frame = 1;
590 
591  return avpkt->size;
592 }
593 
594 static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *data,
595  int jobnr, int threadnr)
596 {
597  VP56Context *s0 = avctx->priv_data;
598  int is_alpha = (jobnr == 1);
599  VP56Context *s = is_alpha ? s0->alpha_context : s0;
600  AVFrame *const p = s->framep[VP56_FRAME_CURRENT];
601  int mb_row, mb_col, mb_row_flip, mb_offset = 0;
602  int block, y, uv, stride_y, stride_uv;
603 
604  if (p->key_frame) {
605  p->pict_type = AV_PICTURE_TYPE_I;
606  s->default_models_init(s);
607  for (block=0; block<s->mb_height*s->mb_width; block++)
608  s->macroblocks[block].type = VP56_MB_INTRA;
609  } else {
610  p->pict_type = AV_PICTURE_TYPE_P;
611  vp56_parse_mb_type_models(s);
612  s->parse_vector_models(s);
613  s->mb_type = VP56_MB_INTER_NOVEC_PF;
614  }
615 
616  if (s->parse_coeff_models(s))
617  goto next;
618 
619  memset(s->prev_dc, 0, sizeof(s->prev_dc));
620  s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
621  s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
622 
623  for (block=0; block < 4*s->mb_width+6; block++) {
624  s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
625  s->above_blocks[block].dc_coeff = 0;
626  s->above_blocks[block].not_null_dc = 0;
627  }
628  s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
629  s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;
630 
631  stride_y = p->linesize[0];
632  stride_uv = p->linesize[1];
633 
634  if (s->flip < 0)
635  mb_offset = 7;
636 
637  /* main macroblocks loop */
638  for (mb_row=0; mb_row<s->mb_height; mb_row++) {
639  if (s->flip < 0)
640  mb_row_flip = s->mb_height - mb_row - 1;
641  else
642  mb_row_flip = mb_row;
643 
644  for (block=0; block<4; block++) {
645  s->left_block[block].ref_frame = VP56_FRAME_NONE;
646  s->left_block[block].dc_coeff = 0;
647  s->left_block[block].not_null_dc = 0;
648  }
649  memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
650  memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
651 
652  s->above_block_idx[0] = 1;
653  s->above_block_idx[1] = 2;
654  s->above_block_idx[2] = 1;
655  s->above_block_idx[3] = 2;
656  s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
657  s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
658 
659  s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
660  s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
661  s->block_offset[1] = s->block_offset[0] + 8;
662  s->block_offset[3] = s->block_offset[2] + 8;
663  s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
664  s->block_offset[5] = s->block_offset[4];
665 
666  for (mb_col=0; mb_col<s->mb_width; mb_col++) {
667  vp56_decode_mb(s, mb_row, mb_col, is_alpha);
668 
669  for (y=0; y<4; y++) {
670  s->above_block_idx[y] += 2;
671  s->block_offset[y] += 16;
672  }
673 
674  for (uv=4; uv<6; uv++) {
675  s->above_block_idx[uv] += 1;
676  s->block_offset[uv] += 8;
677  }
678  }
679  }
680 
681 next:
682  if (p->key_frame || s->golden_frame) {
683  s->framep[VP56_FRAME_GOLDEN] = p;
684  }
685 
686  FFSWAP(AVFrame *, s->framep[VP56_FRAME_CURRENT],
687  s->framep[VP56_FRAME_PREVIOUS]);
688  return 0;
689 }
690 
691 av_cold void ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
692 {
693  VP56Context *s = avctx->priv_data;
694  ff_vp56_init_context(avctx, s, flip, has_alpha);
695 }
696 
697 av_cold void ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
698  int flip, int has_alpha)
699 {
700  int i;
701 
702  s->avctx = avctx;
703  avctx->pix_fmt = has_alpha ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P;
704 
705  ff_dsputil_init(&s->dsp, avctx);
706  ff_videodsp_init(&s->vdsp, 8);
707  ff_vp3dsp_init(&s->vp3dsp, avctx->flags);
708  ff_vp56dsp_init(&s->vp56dsp, avctx->codec->id);
709  ff_init_scantable_permutation(s->dsp.idct_permutation, s->vp3dsp.idct_perm);
710  ff_init_scantable(s->dsp.idct_permutation, &s->scantable,ff_zigzag_direct);
711 
712  for (i=0; i<4; i++) {
713  s->framep[i] = &s->frames[i];
714  avcodec_get_frame_defaults(&s->frames[i]);
715  }
716  s->framep[VP56_FRAME_UNUSED] = s->framep[VP56_FRAME_GOLDEN];
717  s->framep[VP56_FRAME_UNUSED2] = s->framep[VP56_FRAME_GOLDEN2];
718  s->edge_emu_buffer_alloc = NULL;
719 
720  s->above_blocks = NULL;
721  s->macroblocks = NULL;
722  s->quantizer = -1;
723  s->deblock_filtering = 1;
724  s->golden_frame = 0;
725 
726  s->filter = NULL;
727 
728  s->has_alpha = has_alpha;
729 
730  s->modelp = &s->model;
731 
732  if (flip) {
733  s->flip = -1;
734  s->frbi = 2;
735  s->srbi = 0;
736  } else {
737  s->flip = 1;
738  s->frbi = 0;
739  s->srbi = 2;
740  }
741 }
742 
743 av_cold int ff_vp56_free(AVCodecContext *avctx)
744 {
745  VP56Context *s = avctx->priv_data;
746  return ff_vp56_free_context(s);
747 }
748 
749 av_cold int ff_vp56_free_context(VP56Context *s)
750 {
751  AVCodecContext *avctx = s->avctx;
752  int i;
753 
754  av_freep(&s->qscale_table);
755  av_freep(&s->above_blocks);
756  av_freep(&s->macroblocks);
757  av_freep(&s->edge_emu_buffer_alloc);
758  for (i = 0; i < 4; ++i) {
759  if (s->frames[i].data[0])
760  avctx->release_buffer(avctx, &s->frames[i]);
761  }
762  return 0;
763 }
Generated on Sat May 25 2013 03:58:42 for FFmpeg by   doxygen 1.8.2