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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  if(s->avmv && mb_y < mb_h && plane_index == 0)
92  for(mb_x=0; mb_x<mb_w; mb_x++){
93  AVMotionVector *avmv = s->avmv + s->avmv_index;
94  const int b_width = s->b_width << s->block_max_depth;
95  const int b_stride= b_width;
96  BlockNode *bn= &s->block[mb_x + mb_y*b_stride];
97 
98  if (bn->type)
99  continue;
100 
101  s->avmv_index++;
102 
103  avmv->w = block_w;
104  avmv->h = block_h;
105  avmv->dst_x = block_w*mb_x - block_w/2;
106  avmv->dst_y = block_h*mb_y - block_h/2;
107  avmv->motion_scale = 8;
108  avmv->motion_x = bn->mx * s->mv_scale;
109  avmv->motion_y = bn->my * s->mv_scale;
110  avmv->src_x = avmv->dst_x + avmv->motion_x / 8;
111  avmv->src_y = avmv->dst_y + avmv->motion_y / 8;
112  avmv->source= -1 - bn->ref;
113  avmv->flags = 0;
114  }
115 }
116 
117 static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){
118  const int w= b->width;
119  int y;
120  const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
121  int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
122  int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
123  int new_index = 0;
124 
125  if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){
126  qadd= 0;
127  qmul= 1<<QEXPSHIFT;
128  }
129 
130  /* If we are on the second or later slice, restore our index. */
131  if (start_y != 0)
132  new_index = save_state[0];
133 
134 
135  for(y=start_y; y<h; y++){
136  int x = 0;
137  int v;
139  memset(line, 0, b->width*sizeof(IDWTELEM));
140  v = b->x_coeff[new_index].coeff;
141  x = b->x_coeff[new_index++].x;
142  while(x < w){
143  register int t= ( (v>>1)*qmul + qadd)>>QEXPSHIFT;
144  register int u= -(v&1);
145  line[x] = (t^u) - u;
146 
147  v = b->x_coeff[new_index].coeff;
148  x = b->x_coeff[new_index++].x;
149  }
150  }
151 
152  /* Save our variables for the next slice. */
153  save_state[0] = new_index;
154 
155  return;
156 }
157 
158 static int decode_q_branch(SnowContext *s, int level, int x, int y){
159  const int w= s->b_width << s->block_max_depth;
160  const int rem_depth= s->block_max_depth - level;
161  const int index= (x + y*w) << rem_depth;
162  int trx= (x+1)<<rem_depth;
163  const BlockNode *left = x ? &s->block[index-1] : &null_block;
164  const BlockNode *top = y ? &s->block[index-w] : &null_block;
165  const BlockNode *tl = y && x ? &s->block[index-w-1] : left;
166  const BlockNode *tr = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
167  int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
168  int res;
169 
170  if(s->keyframe){
172  return 0;
173  }
174 
175  if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){
176  int type, mx, my;
177  int l = left->color[0];
178  int cb= left->color[1];
179  int cr= left->color[2];
180  unsigned ref = 0;
181  int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
182  int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx));
183  int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my));
184 
185  type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0;
186 
187  if(type){
188  pred_mv(s, &mx, &my, 0, left, top, tr);
189  l += get_symbol(&s->c, &s->block_state[32], 1);
190  if (s->nb_planes > 2) {
191  cb+= get_symbol(&s->c, &s->block_state[64], 1);
192  cr+= get_symbol(&s->c, &s->block_state[96], 1);
193  }
194  }else{
195  if(s->ref_frames > 1)
196  ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0);
197  if (ref >= s->ref_frames) {
198  av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n");
199  return AVERROR_INVALIDDATA;
200  }
201  pred_mv(s, &mx, &my, ref, left, top, tr);
202  mx+= get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
203  my+= get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
204  }
205  set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);
206  }else{
207  if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 ||
208  (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 ||
209  (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 ||
210  (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0)
211  return res;
212  }
213  return 0;
214 }
215 
216 static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
217  const int w= b->width;
218  const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
219  const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
220  const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
221  int x,y;
222 
223  if(s->qlog == LOSSLESS_QLOG) return;
224 
225  for(y=start_y; y<end_y; y++){
226 // DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride));
228  for(x=0; x<w; x++){
229  int i= line[x];
230  if(i<0){
231  line[x]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
232  }else if(i>0){
233  line[x]= (( i*qmul + qadd)>>(QEXPSHIFT));
234  }
235  }
236  }
237 }
238 
239 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){
240  const int w= b->width;
241  int x,y;
242 
243  IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning
244  IDWTELEM * prev;
245 
246  if (start_y != 0)
247  line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
248 
249  for(y=start_y; y<end_y; y++){
250  prev = line;
251 // line = slice_buffer_get_line_from_address(sb, src + (y * stride));
252  line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
253  for(x=0; x<w; x++){
254  if(x){
255  if(use_median){
256  if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]);
257  else line[x] += line[x - 1];
258  }else{
259  if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]);
260  else line[x] += line[x - 1];
261  }
262  }else{
263  if(y) line[x] += prev[x];
264  }
265  }
266  }
267 }
268 
269 static void decode_qlogs(SnowContext *s){
270  int plane_index, level, orientation;
271 
272  for(plane_index=0; plane_index < s->nb_planes; plane_index++){
273  for(level=0; level<s->spatial_decomposition_count; level++){
274  for(orientation=level ? 1:0; orientation<4; orientation++){
275  int q;
276  if (plane_index==2) q= s->plane[1].band[level][orientation].qlog;
277  else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog;
278  else q= get_symbol(&s->c, s->header_state, 1);
279  s->plane[plane_index].band[level][orientation].qlog= q;
280  }
281  }
282  }
283 }
284 
285 #define GET_S(dst, check) \
286  tmp= get_symbol(&s->c, s->header_state, 0);\
287  if(!(check)){\
288  av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\
289  return AVERROR_INVALIDDATA;\
290  }\
291  dst= tmp;
292 
294  int plane_index, tmp;
295  uint8_t kstate[32];
296 
297  memset(kstate, MID_STATE, sizeof(kstate));
298 
299  s->keyframe= get_rac(&s->c, kstate);
300  if(s->keyframe || s->always_reset){
303  s->qlog=
304  s->qbias=
305  s->mv_scale=
306  s->block_max_depth= 0;
307  }
308  if(s->keyframe){
309  GET_S(s->version, tmp <= 0U)
310  s->always_reset= get_rac(&s->c, s->header_state);
314  s->colorspace_type= get_symbol(&s->c, s->header_state, 0);
315  if (s->colorspace_type == 1) {
317  s->nb_planes = 1;
318  } else if(s->colorspace_type == 0) {
319  s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0);
320  s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0);
321 
322  if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){
324  }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){
326  }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){
328  } else {
329  av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift);
330  s->chroma_h_shift = s->chroma_v_shift = 1;
332  return AVERROR_INVALIDDATA;
333  }
334  s->nb_planes = 3;
335  } else {
336  av_log(s, AV_LOG_ERROR, "unsupported color space\n");
337  s->chroma_h_shift = s->chroma_v_shift = 1;
339  return AVERROR_INVALIDDATA;
340  }
341 
342 
344 // s->rate_scalability= get_rac(&s->c, s->header_state);
345  GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES)
346  s->max_ref_frames++;
347 
348  decode_qlogs(s);
349  }
350 
351  if(!s->keyframe){
352  if(get_rac(&s->c, s->header_state)){
353  for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
354  int htaps, i, sum=0;
355  Plane *p= &s->plane[plane_index];
356  p->diag_mc= get_rac(&s->c, s->header_state);
357  htaps= get_symbol(&s->c, s->header_state, 0)*2 + 2;
358  if((unsigned)htaps > HTAPS_MAX || htaps==0)
359  return AVERROR_INVALIDDATA;
360  p->htaps= htaps;
361  for(i= htaps/2; i; i--){
362  p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1));
363  sum += p->hcoeff[i];
364  }
365  p->hcoeff[0]= 32-sum;
366  }
367  s->plane[2].diag_mc= s->plane[1].diag_mc;
368  s->plane[2].htaps = s->plane[1].htaps;
369  memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff));
370  }
371  if(get_rac(&s->c, s->header_state)){
373  decode_qlogs(s);
374  }
375  }
376 
378  if(s->spatial_decomposition_type > 1U){
379  av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type);
380  return AVERROR_INVALIDDATA;
381  }
382  if(FFMIN(s->avctx-> width>>s->chroma_h_shift,
383  s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){
384  av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count);
385  return AVERROR_INVALIDDATA;
386  }
387 
388 
389  s->qlog += get_symbol(&s->c, s->header_state, 1);
390  s->mv_scale += get_symbol(&s->c, s->header_state, 1);
391  s->qbias += get_symbol(&s->c, s->header_state, 1);
392  s->block_max_depth+= get_symbol(&s->c, s->header_state, 1);
393  if(s->block_max_depth > 1 || s->block_max_depth < 0){
394  av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth);
395  s->block_max_depth= 0;
396  return AVERROR_INVALIDDATA;
397  }
398 
399  return 0;
400 }
401 
403 {
404  int ret;
405 
406  if ((ret = ff_snow_common_init(avctx)) < 0) {
407  return ret;
408  }
409 
410  return 0;
411 }
412 
414  int x, y;
415  int w= s->b_width;
416  int h= s->b_height;
417  int res;
418 
419  for(y=0; y<h; y++){
420  for(x=0; x<w; x++){
421  if ((res = decode_q_branch(s, 0, x, y)) < 0)
422  return res;
423  }
424  }
425  return 0;
426 }
427 
428 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
429  AVPacket *avpkt)
430 {
431  const uint8_t *buf = avpkt->data;
432  int buf_size = avpkt->size;
433  SnowContext *s = avctx->priv_data;
434  RangeCoder * const c= &s->c;
435  int bytes_read;
436  AVFrame *picture = data;
437  int level, orientation, plane_index;
438  int res;
439 
440  ff_init_range_decoder(c, buf, buf_size);
441  ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
442 
443  s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
444  if ((res = decode_header(s)) < 0)
445  return res;
446  if ((res=ff_snow_common_init_after_header(avctx)) < 0)
447  return res;
448 
449  // realloc slice buffer for the case that spatial_decomposition_count changed
451  if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height,
452  (MB_SIZE >> s->block_max_depth) +
453  s->spatial_decomposition_count * 11 + 1,
454  s->plane[0].width,
455  s->spatial_idwt_buffer)) < 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  p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40
461  && p->hcoeff[1]==-10
462  && p->hcoeff[2]==2;
463  }
464 
466 
467  if((res = ff_snow_frame_start(s)) < 0)
468  return res;
469 
471 
472  //keyframe flag duplication mess FIXME
473  if(avctx->debug&FF_DEBUG_PICT_INFO)
474  av_log(avctx, AV_LOG_ERROR,
475  "keyframe:%d qlog:%d qbias: %d mvscale: %d "
476  "decomposition_type:%d decomposition_count:%d\n",
477  s->keyframe, s->qlog, s->qbias, s->mv_scale,
480  );
481 
482  av_assert0(!s->avmv);
484  s->avmv = av_malloc_array(s->b_width * s->b_height, sizeof(AVMotionVector) << (s->block_max_depth*2));
485  }
486  s->avmv_index = 0;
487 
488  if ((res = decode_blocks(s)) < 0)
489  return res;
490 
491  for(plane_index=0; plane_index < s->nb_planes; plane_index++){
492  Plane *p= &s->plane[plane_index];
493  int w= p->width;
494  int h= p->height;
495  int x, y;
496  int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */
497 
498  if(s->avctx->debug&2048){
499  memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h);
500  predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
501 
502  for(y=0; y<h; y++){
503  for(x=0; x<w; x++){
504  int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x];
505  s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v;
506  }
507  }
508  }
509 
510  {
511  for(level=0; level<s->spatial_decomposition_count; level++){
512  for(orientation=level ? 1 : 0; orientation<4; orientation++){
513  SubBand *b= &p->band[level][orientation];
514  unpack_coeffs(s, b, b->parent, orientation);
515  }
516  }
517  }
518 
519  {
520  const int mb_h= s->b_height << s->block_max_depth;
521  const int block_size = MB_SIZE >> s->block_max_depth;
522  const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
523  int mb_y;
525  int yd=0, yq=0;
526  int y;
527  int end_y;
528 
530  for(mb_y=0; mb_y<=mb_h; mb_y++){
531 
532  int slice_starty = block_h*mb_y;
533  int slice_h = block_h*(mb_y+1);
534 
535  if (!(s->keyframe || s->avctx->debug&512)){
536  slice_starty = FFMAX(0, slice_starty - (block_h >> 1));
537  slice_h -= (block_h >> 1);
538  }
539 
540  for(level=0; level<s->spatial_decomposition_count; level++){
541  for(orientation=level ? 1 : 0; orientation<4; orientation++){
542  SubBand *b= &p->band[level][orientation];
543  int start_y;
544  int end_y;
545  int our_mb_start = mb_y;
546  int our_mb_end = (mb_y + 1);
547  const int extra= 3;
548  start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0);
549  end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra);
550  if (!(s->keyframe || s->avctx->debug&512)){
551  start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level)));
552  end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level)));
553  }
554  start_y = FFMIN(b->height, start_y);
555  end_y = FFMIN(b->height, end_y);
556 
557  if (start_y != end_y){
558  if (orientation == 0){
559  SubBand * correlate_band = &p->band[0][0];
560  int correlate_end_y = FFMIN(b->height, end_y + 1);
561  int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0));
562  decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]);
563  correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y);
564  dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y);
565  }
566  else
567  decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]);
568  }
569  }
570  }
571 
572  for(; yd<slice_h; yd+=4){
574  }
575 
576  if(s->qlog == LOSSLESS_QLOG){
577  for(; yq<slice_h && yq<h; yq++){
578  IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);
579  for(x=0; x<w; x++){
580  line[x] <<= FRAC_BITS;
581  }
582  }
583  }
584 
585  predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y);
586 
587  y = FFMIN(p->height, slice_starty);
588  end_y = FFMIN(p->height, slice_h);
589  while(y < end_y)
590  ff_slice_buffer_release(&s->sb, y++);
591  }
592 
594  }
595 
596  }
597 
598  emms_c();
599 
600  ff_snow_release_buffer(avctx);
601 
602  if(!(s->avctx->debug&2048))
603  res = av_frame_ref(picture, s->current_picture);
604  else
605  res = av_frame_ref(picture, s->mconly_picture);
606  if (res >= 0 && s->avmv_index) {
607  AVFrameSideData *sd;
608 
610  if (!sd)
611  return AVERROR(ENOMEM);
612  memcpy(sd->data, s->avmv, s->avmv_index * sizeof(AVMotionVector));
613  }
614 
615  av_freep(&s->avmv);
616 
617  if (res < 0)
618  return res;
619 
620  *got_frame = 1;
621 
622  bytes_read= c->bytestream - c->bytestream_start;
623  if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME
624 
625  return bytes_read;
626 }
627 
629 {
630  SnowContext *s = avctx->priv_data;
631 
633 
635 
636  return 0;
637 }
638 
640  .name = "snow",
641  .long_name = NULL_IF_CONFIG_SMALL("Snow"),
642  .type = AVMEDIA_TYPE_VIDEO,
643  .id = AV_CODEC_ID_SNOW,
644  .priv_data_size = sizeof(SnowContext),
645  .init = decode_init,
646  .close = decode_end,
647  .decode = decode_frame,
648  .capabilities = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
649  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
651 };
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: internal.h:48
int version
Definition: snow.h:134
int mv_scale
Definition: snow.h:159
static av_always_inline void predict_plane(SnowContext *s, IDWTELEM *buf, int plane_index, int add)
Definition: snow.h:454
int ff_snow_frame_start(SnowContext *s)
Definition: snow.c:655
#define QSHIFT
Definition: snow.h:42
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
AVCodecContext * avctx
Definition: snow.h:115
int block_max_depth
Definition: snow.h:166
AVFrame * mconly_picture
Definition: snow.h:128
int chroma_v_shift
Definition: snow.h:152
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static const double htaps[HTAPS]
The 2nd half (48 coeffs) of a 96-tap symmetric lowpass filter.
Definition: dsd_tablegen.h:55
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:67
int16_t src_x
Absolute source position.
Definition: motion_vector.h:38
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int always_reset
Definition: snow.h:133
#define BLOCK_INTRA
Intra block, inter otherwise.
Definition: snow.h:57
void ff_slice_buffer_destroy(slice_buffer *buf)
Definition: snow_dwt.c:103
Range coder.
int size
Definition: avcodec.h:1602
const char * b
Definition: vf_curves.c:113
int av_log2(unsigned v)
Definition: intmath.c:26
static av_cold int decode_end(AVCodecContext *avctx)
Definition: snowdec.c:628
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1904
int max_ref_frames
Definition: snow.h:141
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: snowdec.c:428
mpegvideo header.
int ff_snow_common_init_after_header(AVCodecContext *avctx)
Definition: snow.c:514
void ff_spatial_idwt_buffered_slice(SnowDWTContext *dsp, DWTCompose *cs, slice_buffer *slice_buf, IDWTELEM *temp, int width, int height, int stride_line, int type, int decomposition_count, int y)
Definition: snow_dwt.c:658
int keyframe
Definition: snow.h:132
#define src
Definition: vp8dsp.c:254
AVCodec.
Definition: avcodec.h:3601
void ff_snow_reset_contexts(SnowContext *s)
Definition: snow.c:96
static void set_blocks(SnowContext *s, int level, int x, int y, int l, int cb, int cr, int mx, int my, int ref, int type)
Definition: snow.h:461
short IDWTELEM
Definition: dirac_dwt.h:27
int qlog
log(qscale)/log[2^(1/6)]
Definition: snow.h:87
Definition: snow.h:50
int width
Definition: cfhd.h:48
#define HTAPS_MAX
Definition: snow.h:75
uint8_t level
Definition: snow.h:60
uint8_t ref
Reference frame index.
Definition: snow.h:53
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
static double cb(void *priv, double x, double y)
Definition: vf_geq.c:97
#define FF_CODEC_CAP_INIT_THREADSAFE
The codec does not modify any global variables in the init function, allowing to call the init functi...
Definition: internal.h:40
int b_height
Definition: snow.h:165
uint8_t
int16_t mx
Motion vector component X, see mv_scale.
Definition: snow.h:51
#define av_cold
Definition: attributes.h:82
static int get_rac(RangeCoder *c, uint8_t *const state)
Definition: rangecoder.h:115
#define FRAC_BITS
AVOptions.
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2918
int16_t dst_x
Absolute destination position.
Definition: motion_vector.h:42
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:385
Structure to hold side data for an AVFrame.
Definition: frame.h:143
int16_t my
Motion vector component Y, see mv_scale.
Definition: snow.h:52
uint8_t * data
Definition: avcodec.h:1601
int32_t source
Where the current macroblock comes from; negative value when it comes from the past, positive value when it comes from the future.
Definition: motion_vector.h:30
static const BlockNode null_block
Definition: snow.h:63
void ff_snow_release_buffer(AVCodecContext *avctx)
Definition: snow.c:640
#define QEXPSHIFT
Definition: snow.h:506
#define av_log(a,...)
Definition: cfhd.h:43
BlockNode * block
Definition: snow.h:170
#define U(x)
Definition: vp56_arith.h:37
SnowDWTContext dwt
Definition: snow.h:123
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define MB_SIZE
Definition: cinepakenc.c:86
void ff_spatial_idwt_buffered_init(DWTCompose *cs, slice_buffer *sb, int width, int height, int stride_line, int type, int decomposition_count)
Definition: snow_dwt.c:639
int avmv_index
Definition: snow.h:188
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
uint8_t w
Width and height of the block.
Definition: motion_vector.h:34
int diag_mc
Definition: snow.h:105
static void pred_mv(DiracBlock *block, int stride, int x, int y, int ref)
Definition: diracdec.c:1341
AVMotionVector * avmv
Definition: snow.h:187
const uint8_t *const ff_obmc_tab[4]
Definition: snowdata.h:123
Definition: graph2dot.c:48
int stride
Definition: cfhd.h:46
const char * name
Name of the codec implementation.
Definition: avcodec.h:3608
#define FFMAX(a, b)
Definition: common.h:94
uint8_t * bytestream
Definition: rangecoder.h:43
uint8_t color[3]
Color for intra.
Definition: snow.h:54
int ref_frames
Definition: snow.h:142
x_and_coeff * x_coeff
Definition: snow.h:93
int htaps
Definition: snow.h:103
static av_cold int decode_init(AVCodecContext *avctx)
Definition: snowdec.c:402
int qlog
Definition: snow.h:154
void ff_slice_buffer_flush(slice_buffer *buf)
Definition: snow_dwt.c:91
static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)
Definition: ffv1dec.c:65
SubBand band[DWT_LEVELS][4]
Definition: cfhd.h:68
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:258
uint8_t * ibuf
Definition: cfhd.h:53
#define FFMIN(a, b)
Definition: common.h:96
static void unpack_coeffs(SnowContext *s, SubBand *b, SubBand *parent, int orientation)
Definition: snow.h:601
int32_t motion_x
Motion vector src_x = dst_x + motion_x / motion_scale src_y = dst_y + motion_y / motion_scale.
Definition: motion_vector.h:53
#define width
#define LOSSLESS_QLOG
Definition: snow.h:44
int16_t x
Definition: snow.h:78
Motion vectors exported by some codecs (on demand through the export_mvs flag set in the libavcodec A...
Definition: frame.h:95
Plane plane[MAX_PLANES]
Definition: snow.h:169
static av_always_inline void add_yblock(SnowContext *s, int sliced, slice_buffer *sb, IDWTELEM *dst, uint8_t *dst8, const uint8_t *obmc, int src_x, int src_y, int b_w, int b_h, int w, int h, int dst_stride, int src_stride, int obmc_stride, int b_x, int b_y, int add, int offset_dst, int plane_index)
Definition: snow.h:279
int b_width
Definition: snow.h:164
void ff_build_rac_states(RangeCoder *c, int factor, int max_p)
Definition: rangecoder.c:63
#define FFABS(a)
Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they are not representable ...
Definition: common.h:72
int chroma_h_shift
Definition: snow.h:151
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)
Definition: snowdec.c:239
static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer *sb, IDWTELEM *old_buffer, int plane_index, int add, int mb_y)
Definition: snowdec.c:35
uint8_t block_state[128+32 *128]
Definition: snow.h:131
int qbias
Definition: snow.h:161
Libavcodec external API header.
int spatial_decomposition_count
Definition: snow.h:138
int DWTELEM
Definition: dirac_dwt.h:26
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
int debug
debug
Definition: avcodec.h:2917
int ff_slice_buffer_init(slice_buffer *buf, int line_count, int max_allocated_lines, int line_width, IDWTELEM *base_buffer)
Definition: snow_dwt.c:28
main external API structure.
Definition: avcodec.h:1676
int8_t hcoeff[HTAPS_MAX/2]
Definition: snow.h:104
#define QROOT
Definition: snow.h:43
int ff_snow_alloc_blocks(SnowContext *s)
Definition: snow.c:110
uint8_t * data
Definition: frame.h:145
static void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer *sb, int start_y, int h, int save_state[1])
Definition: snowdec.c:117
struct SubBand * parent
Definition: diracdec.c:97
void * buf
Definition: avisynth_c.h:690
GLint GLenum type
Definition: opengl_enc.c:105
AVCodec ff_snow_decoder
Definition: snowdec.c:639
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:68
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, int size)
Add a new side data to a frame.
Definition: frame.c:627
int index
Definition: gxfenc.c:89
av_cold void ff_init_range_decoder(RangeCoder *c, const uint8_t *buf, int buf_size)
Definition: rangecoder.c:53
int nb_planes
Definition: snow.h:168
#define mid_pred
Definition: mathops.h:96
int buf_y_offset
Definition: snow.h:91
int32_t motion_y
Definition: motion_vector.h:53
#define u(width,...)
uint8_t header_state[32]
Definition: snow.h:130
static void decode_qlogs(SnowContext *s)
Definition: snowdec.c:269
int spatial_scalability
Definition: snow.h:153
int ff_snow_common_init(AVCodecContext *avctx)
static int decode_header(SnowContext *s)
Definition: snowdec.c:293
uint16_t coeff
Definition: snow.h:79
int spatial_decomposition_type
Definition: snow.h:135
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
AVFrame * current_picture
Definition: snow.h:125
uint8_t level
Definition: svq3.c:207
uint16_t motion_scale
Definition: motion_vector.h:54
#define MAX_DECOMPOSITIONS
Definition: dirac_dwt.h:30
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:62
Y , 8bpp.
Definition: pixfmt.h:70
uint64_t flags
Extra flag information.
Definition: motion_vector.h:47
#define MID_STATE
Definition: snow.h:39
int temporal_decomposition_type
Definition: snow.h:137
#define QBIAS_SHIFT
Definition: snow.h:163
common internal api header.
static int ref[MAX_W *MAX_W]
Definition: jpeg2000dwt.c:107
IDWTELEM ** line
For use by idwt and predict_slices.
Definition: snow_dwt.h:43
IDWTELEM * temp_idwt_buffer
Definition: snow.h:148
#define slice_buffer_get_line(slice_buf, line_num)
Definition: snow_dwt.h:87
DWTELEM * spatial_dwt_buffer
Definition: snow.h:145
IDWTELEM * spatial_idwt_buffer
Definition: snow.h:147
uint8_t * bytestream_start
Definition: rangecoder.h:42
static void dequantize_slice_buffered(SnowContext *s, slice_buffer *sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y)
Definition: snowdec.c:216
void * priv_data
Definition: avcodec.h:1718
int buf_x_offset
Definition: snow.h:90
int colorspace_type
Definition: snow.h:150
static uint8_t tmp[8]
Definition: des.c:38
int height
Definition: cfhd.h:50
static AVCodec * c
slice_buffer sb
Definition: snow.h:174
int fast_mc
Definition: snow.h:106
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1778
int width
Definition: cfhd.h:57
av_cold void ff_snow_common_end(SnowContext *s)
Definition: snow.c:693
RangeCoder c
Definition: snow.h:116
#define AV_CODEC_FLAG2_EXPORT_MVS
Export motion vectors through frame side data.
Definition: avcodec.h:933
uint8_t ff_qexp[QROOT]
Definition: snowdata.h:128
static int decode_blocks(SnowContext *s)
Definition: snowdec.c:413
#define av_freep(p)
#define MAX_REF_FRAMES
Definition: snow.h:46
void ff_slice_buffer_release(slice_buffer *buf, int line)
Definition: snow_dwt.c:78
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2045
#define av_always_inline
Definition: attributes.h:39
static uint32_t inverse(uint32_t v)
find multiplicative inverse modulo 2 ^ 32
Definition: asfcrypt.c:35
#define av_malloc_array(a, b)
uint8_t type
Bitfield of BLOCK_*.
Definition: snow.h:55
Used to minimize the amount of memory used in order to optimize cache performance.
Definition: snow_dwt.h:42
int height
Definition: cfhd.h:58
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:98
int temporal_decomposition_count
Definition: snow.h:140
This structure stores compressed data.
Definition: avcodec.h:1578
static int decode_q_branch(SnowContext *s, int level, int x, int y)
Definition: snowdec.c:158
#define GET_S(dst, check)
Definition: snowdec.c:285
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:959
Predicted.
Definition: avutil.h:269
Definition: cfhd.h:56
int stride_line
Stride measured in lines, not pixels.
Definition: snow.h:92