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snowdec.c
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1 /*
2  * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
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 #include "libavutil/intmath.h"
22 #include "libavutil/log.h"
23 #include "libavutil/opt.h"
24 #include "avcodec.h"
25 #include "snow_dwt.h"
26 #include "internal.h"
27 #include "snow.h"
28 
29 #include "rangecoder.h"
30 #include "mathops.h"
31 
32 #include "mpegvideo.h"
33 #include "h263.h"
34 
35 static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer * sb, IDWTELEM * old_buffer, int plane_index, int add, int mb_y){
36  Plane *p= &s->plane[plane_index];
37  const int mb_w= s->b_width << s->block_max_depth;
38  const int mb_h= s->b_height << s->block_max_depth;
39  int x, y, mb_x;
40  int block_size = MB_SIZE >> s->block_max_depth;
41  int block_w = plane_index ? block_size>>s->chroma_h_shift : block_size;
42  int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
43  const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth];
44  int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size;
45  int ref_stride= s->current_picture->linesize[plane_index];
46  uint8_t *dst8= s->current_picture->data[plane_index];
47  int w= p->width;
48  int h= p->height;
49 
50  if(s->keyframe || (s->avctx->debug&512)){
51  if(mb_y==mb_h)
52  return;
53 
54  if(add){
55  for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
56 // DWTELEM * line = slice_buffer_get_line(sb, y);
57  IDWTELEM * line = sb->line[y];
58  for(x=0; x<w; x++){
59 // int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
60  int v= line[x] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1));
61  v >>= FRAC_BITS;
62  if(v&(~255)) v= ~(v>>31);
63  dst8[x + y*ref_stride]= v;
64  }
65  }
66  }else{
67  for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){
68 // DWTELEM * line = slice_buffer_get_line(sb, y);
69  IDWTELEM * line = sb->line[y];
70  for(x=0; x<w; x++){
71  line[x] -= 128 << FRAC_BITS;
72 // buf[x + y*w]-= 128<<FRAC_BITS;
73  }
74  }
75  }
76 
77  return;
78  }
79 
80  for(mb_x=0; mb_x<=mb_w; mb_x++){
81  add_yblock(s, 1, sb, old_buffer, dst8, obmc,
82  block_w*mb_x - block_w/2,
83  block_h*mb_y - block_h/2,
84  block_w, block_h,
85  w, h,
86  w, ref_stride, obmc_stride,
87  mb_x - 1, mb_y - 1,
88  add, 0, plane_index);
89  }
90 }
91 
92 static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){
93  const int w= b->width;
94  int y;
95  const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
96  int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
97  int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
98  int new_index = 0;
99 
100  if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){
101  qadd= 0;
102  qmul= 1<<QEXPSHIFT;
103  }
104 
105  /* If we are on the second or later slice, restore our index. */
106  if (start_y != 0)
107  new_index = save_state[0];
108 
109 
110  for(y=start_y; y<h; y++){
111  int x = 0;
112  int v;
114  memset(line, 0, b->width*sizeof(IDWTELEM));
115  v = b->x_coeff[new_index].coeff;
116  x = b->x_coeff[new_index++].x;
117  while(x < w){
118  register int t= ( (v>>1)*qmul + qadd)>>QEXPSHIFT;
119  register int u= -(v&1);
120  line[x] = (t^u) - u;
121 
122  v = b->x_coeff[new_index].coeff;
123  x = b->x_coeff[new_index++].x;
124  }
125  }
126 
127  /* Save our variables for the next slice. */
128  save_state[0] = new_index;
129 
130  return;
131 }
132 
133 static int decode_q_branch(SnowContext *s, int level, int x, int y){
134  const int w= s->b_width << s->block_max_depth;
135  const int rem_depth= s->block_max_depth - level;
136  const int index= (x + y*w) << rem_depth;
137  int trx= (x+1)<<rem_depth;
138  const BlockNode *left = x ? &s->block[index-1] : &null_block;
139  const BlockNode *top = y ? &s->block[index-w] : &null_block;
140  const BlockNode *tl = y && x ? &s->block[index-w-1] : left;
141  const BlockNode *tr = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
142  int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
143  int res;
144 
145  if(s->keyframe){
147  return 0;
148  }
149 
150  if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){
151  int type, mx, my;
152  int l = left->color[0];
153  int cb= left->color[1];
154  int cr= left->color[2];
155  int ref = 0;
156  int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
157  int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx));
158  int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my));
159 
160  type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0;
161 
162  if(type){
163  pred_mv(s, &mx, &my, 0, left, top, tr);
164  l += get_symbol(&s->c, &s->block_state[32], 1);
165  if (s->nb_planes > 2) {
166  cb+= get_symbol(&s->c, &s->block_state[64], 1);
167  cr+= get_symbol(&s->c, &s->block_state[96], 1);
168  }
169  }else{
170  if(s->ref_frames > 1)
171  ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0);
172  if (ref >= s->ref_frames) {
173  av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n");
174  return AVERROR_INVALIDDATA;
175  }
176  pred_mv(s, &mx, &my, ref, left, top, tr);
177  mx+= get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
178  my+= get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
179  }
180  set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);
181  }else{
182  if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 ||
183  (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 ||
184  (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 ||
185  (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0)
186  return res;
187  }
188  return 0;
189 }
190 
191 static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
192  const int w= b->width;
193  const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
194  const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
195  const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
196  int x,y;
197 
198  if(s->qlog == LOSSLESS_QLOG) return;
199 
200  for(y=start_y; y<end_y; y++){
201 // DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride));
203  for(x=0; x<w; x++){
204  int i= line[x];
205  if(i<0){
206  line[x]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
207  }else if(i>0){
208  line[x]= (( i*qmul + qadd)>>(QEXPSHIFT));
209  }
210  }
211  }
212 }
213 
214 static void correlate_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median, int start_y, int end_y){
215  const int w= b->width;
216  int x,y;
217 
218  IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning
219  IDWTELEM * prev;
220 
221  if (start_y != 0)
222  line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
223 
224  for(y=start_y; y<end_y; y++){
225  prev = line;
226 // line = slice_buffer_get_line_from_address(sb, src + (y * stride));
227  line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
228  for(x=0; x<w; x++){
229  if(x){
230  if(use_median){
231  if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]);
232  else line[x] += line[x - 1];
233  }else{
234  if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]);
235  else line[x] += line[x - 1];
236  }
237  }else{
238  if(y) line[x] += prev[x];
239  }
240  }
241  }
242 }
243 
244 static void decode_qlogs(SnowContext *s){
245  int plane_index, level, orientation;
246 
247  for(plane_index=0; plane_index < s->nb_planes; plane_index++){
248  for(level=0; level<s->spatial_decomposition_count; level++){
249  for(orientation=level ? 1:0; orientation<4; orientation++){
250  int q;
251  if (plane_index==2) q= s->plane[1].band[level][orientation].qlog;
252  else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog;
253  else q= get_symbol(&s->c, s->header_state, 1);
254  s->plane[plane_index].band[level][orientation].qlog= q;
255  }
256  }
257  }
258 }
259 
260 #define GET_S(dst, check) \
261  tmp= get_symbol(&s->c, s->header_state, 0);\
262  if(!(check)){\
263  av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\
264  return AVERROR_INVALIDDATA;\
265  }\
266  dst= tmp;
267 
269  int plane_index, tmp;
270  uint8_t kstate[32];
271 
272  memset(kstate, MID_STATE, sizeof(kstate));
273 
274  s->keyframe= get_rac(&s->c, kstate);
275  if(s->keyframe || s->always_reset){
278  s->qlog=
279  s->qbias=
280  s->mv_scale=
281  s->block_max_depth= 0;
282  }
283  if(s->keyframe){
284  GET_S(s->version, tmp <= 0U)
285  s->always_reset= get_rac(&s->c, s->header_state);
289  s->colorspace_type= get_symbol(&s->c, s->header_state, 0);
290  if (s->colorspace_type == 1) {
292  s->nb_planes = 1;
293  } else if(s->colorspace_type == 0) {
294  s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0);
295  s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0);
296 
297  if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){
299  }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){
301  }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){
303  } else {
304  av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift);
305  s->chroma_h_shift = s->chroma_v_shift = 1;
307  return AVERROR_INVALIDDATA;
308  }
309  s->nb_planes = 3;
310  } else {
311  av_log(s, AV_LOG_ERROR, "unsupported color space\n");
312  s->chroma_h_shift = s->chroma_v_shift = 1;
314  return AVERROR_INVALIDDATA;
315  }
316 
317 
319 // s->rate_scalability= get_rac(&s->c, s->header_state);
320  GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES)
321  s->max_ref_frames++;
322 
323  decode_qlogs(s);
324  }
325 
326  if(!s->keyframe){
327  if(get_rac(&s->c, s->header_state)){
328  for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
329  int htaps, i, sum=0;
330  Plane *p= &s->plane[plane_index];
331  p->diag_mc= get_rac(&s->c, s->header_state);
332  htaps= get_symbol(&s->c, s->header_state, 0)*2 + 2;
333  if((unsigned)htaps > HTAPS_MAX || htaps==0)
334  return AVERROR_INVALIDDATA;
335  p->htaps= htaps;
336  for(i= htaps/2; i; i--){
337  p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1));
338  sum += p->hcoeff[i];
339  }
340  p->hcoeff[0]= 32-sum;
341  }
342  s->plane[2].diag_mc= s->plane[1].diag_mc;
343  s->plane[2].htaps = s->plane[1].htaps;
344  memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff));
345  }
346  if(get_rac(&s->c, s->header_state)){
348  decode_qlogs(s);
349  }
350  }
351 
353  if(s->spatial_decomposition_type > 1U){
354  av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type);
355  return AVERROR_INVALIDDATA;
356  }
357  if(FFMIN(s->avctx-> width>>s->chroma_h_shift,
358  s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){
359  av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count);
360  return AVERROR_INVALIDDATA;
361  }
362 
363 
364  s->qlog += get_symbol(&s->c, s->header_state, 1);
365  s->mv_scale += get_symbol(&s->c, s->header_state, 1);
366  s->qbias += get_symbol(&s->c, s->header_state, 1);
367  s->block_max_depth+= get_symbol(&s->c, s->header_state, 1);
368  if(s->block_max_depth > 1 || s->block_max_depth < 0){
369  av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth);
370  s->block_max_depth= 0;
371  return AVERROR_INVALIDDATA;
372  }
373 
374  return 0;
375 }
376 
378 {
379  int ret;
380 
381  if ((ret = ff_snow_common_init(avctx)) < 0) {
383  return ret;
384  }
385 
386  return 0;
387 }
388 
390  int x, y;
391  int w= s->b_width;
392  int h= s->b_height;
393  int res;
394 
395  for(y=0; y<h; y++){
396  for(x=0; x<w; x++){
397  if ((res = decode_q_branch(s, 0, x, y)) < 0)
398  return res;
399  }
400  }
401  return 0;
402 }
403 
404 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
405  AVPacket *avpkt)
406 {
407  const uint8_t *buf = avpkt->data;
408  int buf_size = avpkt->size;
409  SnowContext *s = avctx->priv_data;
410  RangeCoder * const c= &s->c;
411  int bytes_read;
412  AVFrame *picture = data;
413  int level, orientation, plane_index;
414  int res;
415 
416  ff_init_range_decoder(c, buf, buf_size);
417  ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
418 
419  s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
420  if ((res = decode_header(s)) < 0)
421  return res;
422  if ((res=ff_snow_common_init_after_header(avctx)) < 0)
423  return res;
424 
425  // realloc slice buffer for the case that spatial_decomposition_count changed
427  if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height,
428  (MB_SIZE >> s->block_max_depth) +
429  s->spatial_decomposition_count * 11 + 1,
430  s->plane[0].width,
431  s->spatial_idwt_buffer)) < 0)
432  return res;
433 
434  for(plane_index=0; plane_index < s->nb_planes; plane_index++){
435  Plane *p= &s->plane[plane_index];
436  p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40
437  && p->hcoeff[1]==-10
438  && p->hcoeff[2]==2;
439  }
440 
442 
443  if((res = ff_snow_frame_start(s)) < 0)
444  return res;
445  //keyframe flag duplication mess FIXME
446  if(avctx->debug&FF_DEBUG_PICT_INFO)
447  av_log(avctx, AV_LOG_ERROR,
448  "keyframe:%d qlog:%d qbias: %d mvscale: %d "
449  "decomposition_type:%d decomposition_count:%d\n",
450  s->keyframe, s->qlog, s->qbias, s->mv_scale,
453  );
454 
455  if ((res = decode_blocks(s)) < 0)
456  return res;
457 
458  for(plane_index=0; plane_index < s->nb_planes; plane_index++){
459  Plane *p= &s->plane[plane_index];
460  int w= p->width;
461  int h= p->height;
462  int x, y;
463  int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */
464 
465  if(s->avctx->debug&2048){
466  memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h);
467  predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
468 
469  for(y=0; y<h; y++){
470  for(x=0; x<w; x++){
471  int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x];
472  s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v;
473  }
474  }
475  }
476 
477  {
478  for(level=0; level<s->spatial_decomposition_count; level++){
479  for(orientation=level ? 1 : 0; orientation<4; orientation++){
480  SubBand *b= &p->band[level][orientation];
481  unpack_coeffs(s, b, b->parent, orientation);
482  }
483  }
484  }
485 
486  {
487  const int mb_h= s->b_height << s->block_max_depth;
488  const int block_size = MB_SIZE >> s->block_max_depth;
489  const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
490  int mb_y;
492  int yd=0, yq=0;
493  int y;
494  int end_y;
495 
497  for(mb_y=0; mb_y<=mb_h; mb_y++){
498 
499  int slice_starty = block_h*mb_y;
500  int slice_h = block_h*(mb_y+1);
501 
502  if (!(s->keyframe || s->avctx->debug&512)){
503  slice_starty = FFMAX(0, slice_starty - (block_h >> 1));
504  slice_h -= (block_h >> 1);
505  }
506 
507  for(level=0; level<s->spatial_decomposition_count; level++){
508  for(orientation=level ? 1 : 0; orientation<4; orientation++){
509  SubBand *b= &p->band[level][orientation];
510  int start_y;
511  int end_y;
512  int our_mb_start = mb_y;
513  int our_mb_end = (mb_y + 1);
514  const int extra= 3;
515  start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0);
516  end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra);
517  if (!(s->keyframe || s->avctx->debug&512)){
518  start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level)));
519  end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level)));
520  }
521  start_y = FFMIN(b->height, start_y);
522  end_y = FFMIN(b->height, end_y);
523 
524  if (start_y != end_y){
525  if (orientation == 0){
526  SubBand * correlate_band = &p->band[0][0];
527  int correlate_end_y = FFMIN(b->height, end_y + 1);
528  int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0));
529  decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]);
530  correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y);
531  dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y);
532  }
533  else
534  decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]);
535  }
536  }
537  }
538 
539  for(; yd<slice_h; yd+=4){
541  }
542 
543  if(s->qlog == LOSSLESS_QLOG){
544  for(; yq<slice_h && yq<h; yq++){
545  IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);
546  for(x=0; x<w; x++){
547  line[x] <<= FRAC_BITS;
548  }
549  }
550  }
551 
552  predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y);
553 
554  y = FFMIN(p->height, slice_starty);
555  end_y = FFMIN(p->height, slice_h);
556  while(y < end_y)
557  ff_slice_buffer_release(&s->sb, y++);
558  }
559 
561  }
562 
563  }
564 
565  emms_c();
566 
567  ff_snow_release_buffer(avctx);
568 
569  if(!(s->avctx->debug&2048))
570  res = av_frame_ref(picture, s->current_picture);
571  else
572  res = av_frame_ref(picture, s->mconly_picture);
573 
574  if (res < 0)
575  return res;
576 
577  *got_frame = 1;
578 
579  bytes_read= c->bytestream - c->bytestream_start;
580  if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME
581 
582  return bytes_read;
583 }
584 
586 {
587  SnowContext *s = avctx->priv_data;
588 
590 
592 
593  return 0;
594 }
595 
597  .name = "snow",
598  .long_name = NULL_IF_CONFIG_SMALL("Snow"),
599  .type = AVMEDIA_TYPE_VIDEO,
600  .id = AV_CODEC_ID_SNOW,
601  .priv_data_size = sizeof(SnowContext),
602  .init = decode_init,
603  .close = decode_end,
604  .decode = decode_frame,
605  .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
606 };