FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
snowdec.c
Go to the documentation of this file.
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->src_x = avmv->dst_x + (bn->mx * s->mv_scale)/8;
108  avmv->src_y = avmv->dst_y + (bn->my * s->mv_scale)/8;
109  avmv->source= -1 - bn->ref;
110  avmv->flags = 0;
111  }
112 }
113 
114 static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){
115  const int w= b->width;
116  int y;
117  const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
118  int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
119  int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
120  int new_index = 0;
121 
122  if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){
123  qadd= 0;
124  qmul= 1<<QEXPSHIFT;
125  }
126 
127  /* If we are on the second or later slice, restore our index. */
128  if (start_y != 0)
129  new_index = save_state[0];
130 
131 
132  for(y=start_y; y<h; y++){
133  int x = 0;
134  int v;
136  memset(line, 0, b->width*sizeof(IDWTELEM));
137  v = b->x_coeff[new_index].coeff;
138  x = b->x_coeff[new_index++].x;
139  while(x < w){
140  register int t= ( (v>>1)*qmul + qadd)>>QEXPSHIFT;
141  register int u= -(v&1);
142  line[x] = (t^u) - u;
143 
144  v = b->x_coeff[new_index].coeff;
145  x = b->x_coeff[new_index++].x;
146  }
147  }
148 
149  /* Save our variables for the next slice. */
150  save_state[0] = new_index;
151 
152  return;
153 }
154 
155 static int decode_q_branch(SnowContext *s, int level, int x, int y){
156  const int w= s->b_width << s->block_max_depth;
157  const int rem_depth= s->block_max_depth - level;
158  const int index= (x + y*w) << rem_depth;
159  int trx= (x+1)<<rem_depth;
160  const BlockNode *left = x ? &s->block[index-1] : &null_block;
161  const BlockNode *top = y ? &s->block[index-w] : &null_block;
162  const BlockNode *tl = y && x ? &s->block[index-w-1] : left;
163  const BlockNode *tr = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
164  int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
165  int res;
166 
167  if(s->keyframe){
169  return 0;
170  }
171 
172  if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){
173  int type, mx, my;
174  int l = left->color[0];
175  int cb= left->color[1];
176  int cr= left->color[2];
177  unsigned ref = 0;
178  int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
179  int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx));
180  int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my));
181 
182  type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0;
183 
184  if(type){
185  pred_mv(s, &mx, &my, 0, left, top, tr);
186  l += get_symbol(&s->c, &s->block_state[32], 1);
187  if (s->nb_planes > 2) {
188  cb+= get_symbol(&s->c, &s->block_state[64], 1);
189  cr+= get_symbol(&s->c, &s->block_state[96], 1);
190  }
191  }else{
192  if(s->ref_frames > 1)
193  ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0);
194  if (ref >= s->ref_frames) {
195  av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n");
196  return AVERROR_INVALIDDATA;
197  }
198  pred_mv(s, &mx, &my, ref, left, top, tr);
199  mx+= get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1);
200  my+= get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1);
201  }
202  set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type);
203  }else{
204  if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 ||
205  (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 ||
206  (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 ||
207  (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0)
208  return res;
209  }
210  return 0;
211 }
212 
213 static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){
214  const int w= b->width;
215  const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
216  const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
217  const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
218  int x,y;
219 
220  if(s->qlog == LOSSLESS_QLOG) return;
221 
222  for(y=start_y; y<end_y; y++){
223 // DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride));
225  for(x=0; x<w; x++){
226  int i= line[x];
227  if(i<0){
228  line[x]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
229  }else if(i>0){
230  line[x]= (( i*qmul + qadd)>>(QEXPSHIFT));
231  }
232  }
233  }
234 }
235 
236 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){
237  const int w= b->width;
238  int x,y;
239 
240  IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning
241  IDWTELEM * prev;
242 
243  if (start_y != 0)
244  line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
245 
246  for(y=start_y; y<end_y; y++){
247  prev = line;
248 // line = slice_buffer_get_line_from_address(sb, src + (y * stride));
249  line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset;
250  for(x=0; x<w; x++){
251  if(x){
252  if(use_median){
253  if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]);
254  else line[x] += line[x - 1];
255  }else{
256  if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]);
257  else line[x] += line[x - 1];
258  }
259  }else{
260  if(y) line[x] += prev[x];
261  }
262  }
263  }
264 }
265 
266 static void decode_qlogs(SnowContext *s){
267  int plane_index, level, orientation;
268 
269  for(plane_index=0; plane_index < s->nb_planes; plane_index++){
270  for(level=0; level<s->spatial_decomposition_count; level++){
271  for(orientation=level ? 1:0; orientation<4; orientation++){
272  int q;
273  if (plane_index==2) q= s->plane[1].band[level][orientation].qlog;
274  else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog;
275  else q= get_symbol(&s->c, s->header_state, 1);
276  s->plane[plane_index].band[level][orientation].qlog= q;
277  }
278  }
279  }
280 }
281 
282 #define GET_S(dst, check) \
283  tmp= get_symbol(&s->c, s->header_state, 0);\
284  if(!(check)){\
285  av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\
286  return AVERROR_INVALIDDATA;\
287  }\
288  dst= tmp;
289 
291  int plane_index, tmp;
292  uint8_t kstate[32];
293 
294  memset(kstate, MID_STATE, sizeof(kstate));
295 
296  s->keyframe= get_rac(&s->c, kstate);
297  if(s->keyframe || s->always_reset){
300  s->qlog=
301  s->qbias=
302  s->mv_scale=
303  s->block_max_depth= 0;
304  }
305  if(s->keyframe){
306  GET_S(s->version, tmp <= 0U)
307  s->always_reset= get_rac(&s->c, s->header_state);
311  s->colorspace_type= get_symbol(&s->c, s->header_state, 0);
312  if (s->colorspace_type == 1) {
314  s->nb_planes = 1;
315  } else if(s->colorspace_type == 0) {
316  s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0);
317  s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0);
318 
319  if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){
321  }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){
323  }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){
325  } else {
326  av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift);
327  s->chroma_h_shift = s->chroma_v_shift = 1;
329  return AVERROR_INVALIDDATA;
330  }
331  s->nb_planes = 3;
332  } else {
333  av_log(s, AV_LOG_ERROR, "unsupported color space\n");
334  s->chroma_h_shift = s->chroma_v_shift = 1;
336  return AVERROR_INVALIDDATA;
337  }
338 
339 
341 // s->rate_scalability= get_rac(&s->c, s->header_state);
342  GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES)
343  s->max_ref_frames++;
344 
345  decode_qlogs(s);
346  }
347 
348  if(!s->keyframe){
349  if(get_rac(&s->c, s->header_state)){
350  for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){
351  int htaps, i, sum=0;
352  Plane *p= &s->plane[plane_index];
353  p->diag_mc= get_rac(&s->c, s->header_state);
354  htaps= get_symbol(&s->c, s->header_state, 0)*2 + 2;
355  if((unsigned)htaps > HTAPS_MAX || htaps==0)
356  return AVERROR_INVALIDDATA;
357  p->htaps= htaps;
358  for(i= htaps/2; i; i--){
359  p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1));
360  sum += p->hcoeff[i];
361  }
362  p->hcoeff[0]= 32-sum;
363  }
364  s->plane[2].diag_mc= s->plane[1].diag_mc;
365  s->plane[2].htaps = s->plane[1].htaps;
366  memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff));
367  }
368  if(get_rac(&s->c, s->header_state)){
370  decode_qlogs(s);
371  }
372  }
373 
375  if(s->spatial_decomposition_type > 1U){
376  av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type);
377  return AVERROR_INVALIDDATA;
378  }
379  if(FFMIN(s->avctx-> width>>s->chroma_h_shift,
380  s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){
381  av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count);
382  return AVERROR_INVALIDDATA;
383  }
384 
385 
386  s->qlog += get_symbol(&s->c, s->header_state, 1);
387  s->mv_scale += get_symbol(&s->c, s->header_state, 1);
388  s->qbias += get_symbol(&s->c, s->header_state, 1);
389  s->block_max_depth+= get_symbol(&s->c, s->header_state, 1);
390  if(s->block_max_depth > 1 || s->block_max_depth < 0){
391  av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth);
392  s->block_max_depth= 0;
393  return AVERROR_INVALIDDATA;
394  }
395 
396  return 0;
397 }
398 
400 {
401  int ret;
402 
403  if ((ret = ff_snow_common_init(avctx)) < 0) {
404  return ret;
405  }
406 
407  return 0;
408 }
409 
411  int x, y;
412  int w= s->b_width;
413  int h= s->b_height;
414  int res;
415 
416  for(y=0; y<h; y++){
417  for(x=0; x<w; x++){
418  if ((res = decode_q_branch(s, 0, x, y)) < 0)
419  return res;
420  }
421  }
422  return 0;
423 }
424 
425 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
426  AVPacket *avpkt)
427 {
428  const uint8_t *buf = avpkt->data;
429  int buf_size = avpkt->size;
430  SnowContext *s = avctx->priv_data;
431  RangeCoder * const c= &s->c;
432  int bytes_read;
433  AVFrame *picture = data;
434  int level, orientation, plane_index;
435  int res;
436 
437  ff_init_range_decoder(c, buf, buf_size);
438  ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
439 
440  s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P
441  if ((res = decode_header(s)) < 0)
442  return res;
443  if ((res=ff_snow_common_init_after_header(avctx)) < 0)
444  return res;
445 
446  // realloc slice buffer for the case that spatial_decomposition_count changed
448  if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height,
449  (MB_SIZE >> s->block_max_depth) +
450  s->spatial_decomposition_count * 11 + 1,
451  s->plane[0].width,
452  s->spatial_idwt_buffer)) < 0)
453  return res;
454 
455  for(plane_index=0; plane_index < s->nb_planes; plane_index++){
456  Plane *p= &s->plane[plane_index];
457  p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40
458  && p->hcoeff[1]==-10
459  && p->hcoeff[2]==2;
460  }
461 
463 
464  if((res = ff_snow_frame_start(s)) < 0)
465  return res;
466 
468 
469  //keyframe flag duplication mess FIXME
470  if(avctx->debug&FF_DEBUG_PICT_INFO)
471  av_log(avctx, AV_LOG_ERROR,
472  "keyframe:%d qlog:%d qbias: %d mvscale: %d "
473  "decomposition_type:%d decomposition_count:%d\n",
474  s->keyframe, s->qlog, s->qbias, s->mv_scale,
477  );
478 
479  av_assert0(!s->avmv);
480  if (s->avctx->flags2 & CODEC_FLAG2_EXPORT_MVS) {
481  s->avmv = av_malloc_array(s->b_width * s->b_height, sizeof(AVMotionVector) << (s->block_max_depth*2));
482  }
483  s->avmv_index = 0;
484 
485  if ((res = decode_blocks(s)) < 0)
486  return res;
487 
488  for(plane_index=0; plane_index < s->nb_planes; plane_index++){
489  Plane *p= &s->plane[plane_index];
490  int w= p->width;
491  int h= p->height;
492  int x, y;
493  int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */
494 
495  if(s->avctx->debug&2048){
496  memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h);
497  predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
498 
499  for(y=0; y<h; y++){
500  for(x=0; x<w; x++){
501  int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x];
502  s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v;
503  }
504  }
505  }
506 
507  {
508  for(level=0; level<s->spatial_decomposition_count; level++){
509  for(orientation=level ? 1 : 0; orientation<4; orientation++){
510  SubBand *b= &p->band[level][orientation];
511  unpack_coeffs(s, b, b->parent, orientation);
512  }
513  }
514  }
515 
516  {
517  const int mb_h= s->b_height << s->block_max_depth;
518  const int block_size = MB_SIZE >> s->block_max_depth;
519  const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size;
520  int mb_y;
522  int yd=0, yq=0;
523  int y;
524  int end_y;
525 
527  for(mb_y=0; mb_y<=mb_h; mb_y++){
528 
529  int slice_starty = block_h*mb_y;
530  int slice_h = block_h*(mb_y+1);
531 
532  if (!(s->keyframe || s->avctx->debug&512)){
533  slice_starty = FFMAX(0, slice_starty - (block_h >> 1));
534  slice_h -= (block_h >> 1);
535  }
536 
537  for(level=0; level<s->spatial_decomposition_count; level++){
538  for(orientation=level ? 1 : 0; orientation<4; orientation++){
539  SubBand *b= &p->band[level][orientation];
540  int start_y;
541  int end_y;
542  int our_mb_start = mb_y;
543  int our_mb_end = (mb_y + 1);
544  const int extra= 3;
545  start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0);
546  end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra);
547  if (!(s->keyframe || s->avctx->debug&512)){
548  start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level)));
549  end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level)));
550  }
551  start_y = FFMIN(b->height, start_y);
552  end_y = FFMIN(b->height, end_y);
553 
554  if (start_y != end_y){
555  if (orientation == 0){
556  SubBand * correlate_band = &p->band[0][0];
557  int correlate_end_y = FFMIN(b->height, end_y + 1);
558  int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0));
559  decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]);
560  correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y);
561  dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y);
562  }
563  else
564  decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]);
565  }
566  }
567  }
568 
569  for(; yd<slice_h; yd+=4){
571  }
572 
573  if(s->qlog == LOSSLESS_QLOG){
574  for(; yq<slice_h && yq<h; yq++){
575  IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);
576  for(x=0; x<w; x++){
577  line[x] <<= FRAC_BITS;
578  }
579  }
580  }
581 
582  predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y);
583 
584  y = FFMIN(p->height, slice_starty);
585  end_y = FFMIN(p->height, slice_h);
586  while(y < end_y)
587  ff_slice_buffer_release(&s->sb, y++);
588  }
589 
591  }
592 
593  }
594 
595  emms_c();
596 
597  ff_snow_release_buffer(avctx);
598 
599  if(!(s->avctx->debug&2048))
600  res = av_frame_ref(picture, s->current_picture);
601  else
602  res = av_frame_ref(picture, s->mconly_picture);
603  if (res >= 0 && s->avmv_index) {
604  AVFrameSideData *sd;
605 
607  if (!sd)
608  return AVERROR(ENOMEM);
609  memcpy(sd->data, s->avmv, s->avmv_index * sizeof(AVMotionVector));
610  }
611 
612  av_freep(&s->avmv);
613 
614  if (res < 0)
615  return res;
616 
617  *got_frame = 1;
618 
619  bytes_read= c->bytestream - c->bytestream_start;
620  if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME
621 
622  return bytes_read;
623 }
624 
626 {
627  SnowContext *s = avctx->priv_data;
628 
630 
632 
633  return 0;
634 }
635 
637  .name = "snow",
638  .long_name = NULL_IF_CONFIG_SMALL("Snow"),
639  .type = AVMEDIA_TYPE_VIDEO,
640  .id = AV_CODEC_ID_SNOW,
641  .priv_data_size = sizeof(SnowContext),
642  .init = decode_init,
643  .close = decode_end,
644  .decode = decode_frame,
645  .capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/,
646  .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
648 };
#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:135
int mv_scale
Definition: snow.h:160
static av_always_inline void predict_plane(SnowContext *s, IDWTELEM *buf, int plane_index, int add)
Definition: snow.h:473
int ff_snow_frame_start(SnowContext *s)
Definition: snow.c:655
#define QSHIFT
Definition: snow.h:42
float v
const char * s
Definition: avisynth_c.h:631
#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:167
AVFrame * mconly_picture
Definition: snow.h:129
int chroma_v_shift
Definition: snow.h:153
This structure describes decoded (raw) audio or video data.
Definition: frame.h:171
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:58
planar YUV 4:4:4, 24bpp, (1 Cr & Cb sample per 1x1 Y samples)
Definition: pixfmt.h:68
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:134
#define BLOCK_INTRA
Definition: snow.h:57
void ff_slice_buffer_destroy(slice_buffer *buf)
Definition: snow_dwt.c:103
Range coder.
int size
Definition: avcodec.h:1163
const char * b
Definition: vf_curves.c:109
static av_cold int decode_end(AVCodecContext *avctx)
Definition: snowdec.c:625
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1444
int max_ref_frames
Definition: snow.h:142
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: snowdec.c:425
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:133
AVCodec.
Definition: avcodec.h:3181
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:480
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: diracdec.c:100
#define HTAPS_MAX
Definition: snow.h:75
uint8_t level
Definition: snow.h:60
uint8_t ref
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:96
#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:166
uint8_t
int16_t mx
Definition: snow.h:51
#define av_cold
Definition: attributes.h:74
static int get_rac(RangeCoder *c, uint8_t *const state)
Definition: rangecoder.h:115
#define FRAC_BITS
AVOptions.
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:363
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:789
Structure to hold side data for an AVFrame.
Definition: frame.h:134
int16_t my
Definition: snow.h:52
uint8_t * data
Definition: avcodec.h:1162
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:525
#define av_log(a,...)
BlockNode * block
Definition: snow.h:171
#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:186
#define AVERROR(e)
Definition: error.h:43
#define CODEC_FLAG2_EXPORT_MVS
Export motion vectors through frame side data.
Definition: avcodec.h:773
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
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:1132
AVMotionVector * avmv
Definition: snow.h:185
const uint8_t *const ff_obmc_tab[4]
Definition: snowdata.h:123
Definition: graph2dot.c:48
int stride
Definition: diracdec.c:99
const char * name
Name of the codec implementation.
Definition: avcodec.h:3188
#define FFMAX(a, b)
Definition: common.h:64
Libavcodec external API header.
uint8_t * bytestream
Definition: rangecoder.h:43
uint8_t color[3]
Definition: snow.h:54
int ref_frames
Definition: snow.h:143
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:399
int qlog
Definition: snow.h:155
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:62
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:242
#define FFMIN(a, b)
Definition: common.h:66
float y
static void unpack_coeffs(SnowContext *s, SubBand *b, SubBand *parent, int orientation)
Definition: snow.h:618
#define LOSSLESS_QLOG
Definition: snow.h:44
ret
Definition: avfilter.c:974
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:96
Plane plane[MAX_PLANES]
Definition: snow.h:170
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:298
int b_width
Definition: snow.h:165
void ff_build_rac_states(RangeCoder *c, int factor, int max_p)
Definition: rangecoder.c:62
#define FFABS(a)
Definition: common.h:61
float u
int chroma_h_shift
Definition: snow.h:152
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:236
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
SubBand band[MAX_DWT_LEVELS][4]
Definition: diracdec.c:133
uint8_t block_state[128+32 *128]
Definition: snow.h:132
int qbias
Definition: snow.h:162
AVS_Value src
Definition: avisynth_c.h:482
int spatial_decomposition_count
Definition: snow.h:139
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:199
int debug
debug
Definition: avcodec.h:2565
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:1241
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:136
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:114
struct SubBand * parent
Definition: diracdec.c:104
void * buf
Definition: avisynth_c.h:553
GLint GLenum type
Definition: opengl_enc.c:105
AVCodec ff_snow_decoder
Definition: snowdec.c:636
planar YUV 4:1:0, 9bpp, (1 Cr & Cb sample per 4x4 Y samples)
Definition: pixfmt.h:69
AVFrameSideData * av_frame_new_side_data(AVFrame *frame, enum AVFrameSideDataType type, int size)
Add a new side data to a frame.
Definition: frame.c:584
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:169
#define mid_pred
Definition: mathops.h:96
int buf_y_offset
Definition: snow.h:91
uint8_t header_state[32]
Definition: snow.h:131
static void decode_qlogs(SnowContext *s)
Definition: snowdec.c:266
int spatial_scalability
Definition: snow.h:154
int ff_snow_common_init(AVCodecContext *avctx)
static int decode_header(SnowContext *s)
Definition: snowdec.c:290
uint16_t coeff
Definition: snow.h:79
int spatial_decomposition_type
Definition: snow.h:136
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:182
AVFrame * current_picture
Definition: snow.h:126
uint8_t level
Definition: svq3.c:150
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2566
#define MAX_DECOMPOSITIONS
Definition: dirac_dwt.h:30
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:522
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:63
Y , 8bpp.
Definition: pixfmt.h:71
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:138
#define QBIAS_SHIFT
Definition: snow.h:164
common internal api header.
IDWTELEM ** line
For use by idwt and predict_slices.
Definition: snow_dwt.h:43
IDWTELEM * temp_idwt_buffer
Definition: snow.h:149
#define slice_buffer_get_line(slice_buf, line_num)
Definition: snow_dwt.h:87
static double c[64]
DWTELEM * spatial_dwt_buffer
Definition: snow.h:146
IDWTELEM * spatial_idwt_buffer
Definition: snow.h:148
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:213
void * priv_data
Definition: avcodec.h:1283
int buf_x_offset
Definition: snow.h:90
int colorspace_type
Definition: snow.h:151
#define av_log2
Definition: intmath.h:105
int height
Definition: diracdec.c:101
slice_buffer sb
Definition: snow.h:175
IDWTELEM * ibuf
Definition: diracdec.c:103
int fast_mc
Definition: snow.h:106
int flags2
CODEC_FLAG2_*.
Definition: avcodec.h:1342
int width
Definition: diracdec.c:112
av_cold void ff_snow_common_end(SnowContext *s)
Definition: snow.c:693
RangeCoder c
Definition: snow.h:116
uint8_t ff_qexp[QROOT]
Definition: snowdata.h:128
static int decode_blocks(SnowContext *s)
Definition: snowdec.c:410
#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
#define av_always_inline
Definition: attributes.h:37
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
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: diracdec.c:113
static double cr(void *priv, double x, double y)
Definition: vf_geq.c:97
int temporal_decomposition_count
Definition: snow.h:141
This structure stores compressed data.
Definition: avcodec.h:1139
static int decode_q_branch(SnowContext *s, int level, int x, int y)
Definition: snowdec.c:155
#define GET_S(dst, check)
Definition: snowdec.c:282
Predicted.
Definition: avutil.h:268
int stride_line
Stride measured in lines, not pixels.
Definition: snow.h:92
static int width