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snow_dwt.c
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1 /*
2  * Copyright (C) 2004-2010 Michael Niedermayer <michaelni@gmx.at>
3  * Copyright (C) 2008 David Conrad
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "libavutil/attributes.h"
23 #include "libavutil/avassert.h"
24 #include "libavutil/common.h"
25 #include "dsputil.h"
26 #include "snow_dwt.h"
27 
28 int ff_slice_buffer_init(slice_buffer *buf, int line_count,
29  int max_allocated_lines, int line_width,
30  IDWTELEM *base_buffer)
31 {
32  int i;
33 
34  buf->base_buffer = base_buffer;
35  buf->line_count = line_count;
36  buf->line_width = line_width;
37  buf->data_count = max_allocated_lines;
38  buf->line = av_mallocz(sizeof(IDWTELEM *) * line_count);
39  if (!buf->line)
40  return AVERROR(ENOMEM);
41  buf->data_stack = av_malloc(sizeof(IDWTELEM *) * max_allocated_lines);
42  if (!buf->data_stack) {
43  av_freep(&buf->line);
44  return AVERROR(ENOMEM);
45  }
46 
47  for (i = 0; i < max_allocated_lines; i++) {
48  buf->data_stack[i] = av_malloc(sizeof(IDWTELEM) * line_width);
49  if (!buf->data_stack[i]) {
50  for (i--; i >=0; i--)
51  av_freep(&buf->data_stack[i]);
52  av_freep(&buf->data_stack);
53  av_freep(&buf->line);
54  return AVERROR(ENOMEM);
55  }
56  }
57 
58  buf->data_stack_top = max_allocated_lines - 1;
59  return 0;
60 }
61 
62 IDWTELEM *ff_slice_buffer_load_line(slice_buffer *buf, int line)
63 {
64  IDWTELEM *buffer;
65 
66  av_assert0(buf->data_stack_top >= 0);
67 // av_assert1(!buf->line[line]);
68  if (buf->line[line])
69  return buf->line[line];
70 
71  buffer = buf->data_stack[buf->data_stack_top];
72  buf->data_stack_top--;
73  buf->line[line] = buffer;
74 
75  return buffer;
76 }
77 
78 void ff_slice_buffer_release(slice_buffer *buf, int line)
79 {
80  IDWTELEM *buffer;
81 
82  av_assert1(line >= 0 && line < buf->line_count);
83  av_assert1(buf->line[line]);
84 
85  buffer = buf->line[line];
86  buf->data_stack_top++;
87  buf->data_stack[buf->data_stack_top] = buffer;
88  buf->line[line] = NULL;
89 }
90 
91 void ff_slice_buffer_flush(slice_buffer *buf)
92 {
93  int i;
94  for (i = 0; i < buf->line_count; i++)
95  if (buf->line[i])
96  ff_slice_buffer_release(buf, i);
97 }
98 
99 void ff_slice_buffer_destroy(slice_buffer *buf)
100 {
101  int i;
102  ff_slice_buffer_flush(buf);
103 
104  for (i = buf->data_count - 1; i >= 0; i--)
105  av_freep(&buf->data_stack[i]);
106  av_freep(&buf->data_stack);
107  av_freep(&buf->line);
108 }
109 
110 static inline int mirror(int v, int m)
111 {
112  while ((unsigned)v > (unsigned)m) {
113  v = -v;
114  if (v < 0)
115  v += 2 * m;
116  }
117  return v;
118 }
119 
120 static av_always_inline void lift(DWTELEM *dst, DWTELEM *src, DWTELEM *ref,
121  int dst_step, int src_step, int ref_step,
122  int width, int mul, int add, int shift,
123  int highpass, int inverse)
124 {
125  const int mirror_left = !highpass;
126  const int mirror_right = (width & 1) ^ highpass;
127  const int w = (width >> 1) - 1 + (highpass & width);
128  int i;
129 
130 #define LIFT(src, ref, inv) ((src) + ((inv) ? -(ref) : +(ref)))
131  if (mirror_left) {
132  dst[0] = LIFT(src[0], ((mul * 2 * ref[0] + add) >> shift), inverse);
133  dst += dst_step;
134  src += src_step;
135  }
136 
137  for (i = 0; i < w; i++)
138  dst[i * dst_step] = LIFT(src[i * src_step],
139  ((mul * (ref[i * ref_step] +
140  ref[(i + 1) * ref_step]) +
141  add) >> shift),
142  inverse);
143 
144  if (mirror_right)
145  dst[w * dst_step] = LIFT(src[w * src_step],
146  ((mul * 2 * ref[w * ref_step] + add) >> shift),
147  inverse);
148 }
149 
150 static av_always_inline void liftS(DWTELEM *dst, DWTELEM *src, DWTELEM *ref,
151  int dst_step, int src_step, int ref_step,
152  int width, int mul, int add, int shift,
153  int highpass, int inverse)
154 {
155  const int mirror_left = !highpass;
156  const int mirror_right = (width & 1) ^ highpass;
157  const int w = (width >> 1) - 1 + (highpass & width);
158  int i;
159 
160  av_assert1(shift == 4);
161 #define LIFTS(src, ref, inv) \
162  ((inv) ? (src) + (((ref) + 4 * (src)) >> shift) \
163  : -((-16 * (src) + (ref) + add / \
164  4 + 1 + (5 << 25)) / (5 * 4) - (1 << 23)))
165  if (mirror_left) {
166  dst[0] = LIFTS(src[0], mul * 2 * ref[0] + add, inverse);
167  dst += dst_step;
168  src += src_step;
169  }
170 
171  for (i = 0; i < w; i++)
172  dst[i * dst_step] = LIFTS(src[i * src_step],
173  mul * (ref[i * ref_step] +
174  ref[(i + 1) * ref_step]) + add,
175  inverse);
176 
177  if (mirror_right)
178  dst[w * dst_step] = LIFTS(src[w * src_step],
179  mul * 2 * ref[w * ref_step] + add,
180  inverse);
181 }
182 
183 static void horizontal_decompose53i(DWTELEM *b, DWTELEM *temp, int width)
184 {
185  const int width2 = width >> 1;
186  int x;
187  const int w2 = (width + 1) >> 1;
188 
189  for (x = 0; x < width2; x++) {
190  temp[x] = b[2 * x];
191  temp[x + w2] = b[2 * x + 1];
192  }
193  if (width & 1)
194  temp[x] = b[2 * x];
195  lift(b + w2, temp + w2, temp, 1, 1, 1, width, -1, 0, 1, 1, 0);
196  lift(b, temp, b + w2, 1, 1, 1, width, 1, 2, 2, 0, 0);
197 }
198 
199 static void vertical_decompose53iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
200  int width)
201 {
202  int i;
203 
204  for (i = 0; i < width; i++)
205  b1[i] -= (b0[i] + b2[i]) >> 1;
206 }
207 
208 static void vertical_decompose53iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
209  int width)
210 {
211  int i;
212 
213  for (i = 0; i < width; i++)
214  b1[i] += (b0[i] + b2[i] + 2) >> 2;
215 }
216 
217 static void spatial_decompose53i(DWTELEM *buffer, DWTELEM *temp,
218  int width, int height, int stride)
219 {
220  int y;
221  DWTELEM *b0 = buffer + mirror(-2 - 1, height - 1) * stride;
222  DWTELEM *b1 = buffer + mirror(-2, height - 1) * stride;
223 
224  for (y = -2; y < height; y += 2) {
225  DWTELEM *b2 = buffer + mirror(y + 1, height - 1) * stride;
226  DWTELEM *b3 = buffer + mirror(y + 2, height - 1) * stride;
227 
228  if (y + 1 < (unsigned)height)
229  horizontal_decompose53i(b2, temp, width);
230  if (y + 2 < (unsigned)height)
231  horizontal_decompose53i(b3, temp, width);
232 
233  if (y + 1 < (unsigned)height)
234  vertical_decompose53iH0(b1, b2, b3, width);
235  if (y + 0 < (unsigned)height)
236  vertical_decompose53iL0(b0, b1, b2, width);
237 
238  b0 = b2;
239  b1 = b3;
240  }
241 }
242 
243 static void horizontal_decompose97i(DWTELEM *b, DWTELEM *temp, int width)
244 {
245  const int w2 = (width + 1) >> 1;
246 
247  lift(temp + w2, b + 1, b, 1, 2, 2, width, W_AM, W_AO, W_AS, 1, 1);
248  liftS(temp, b, temp + w2, 1, 2, 1, width, W_BM, W_BO, W_BS, 0, 0);
249  lift(b + w2, temp + w2, temp, 1, 1, 1, width, W_CM, W_CO, W_CS, 1, 0);
250  lift(b, temp, b + w2, 1, 1, 1, width, W_DM, W_DO, W_DS, 0, 0);
251 }
252 
253 static void vertical_decompose97iH0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
254  int width)
255 {
256  int i;
257 
258  for (i = 0; i < width; i++)
259  b1[i] -= (W_AM * (b0[i] + b2[i]) + W_AO) >> W_AS;
260 }
261 
262 static void vertical_decompose97iH1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
263  int width)
264 {
265  int i;
266 
267  for (i = 0; i < width; i++)
268  b1[i] += (W_CM * (b0[i] + b2[i]) + W_CO) >> W_CS;
269 }
270 
271 static void vertical_decompose97iL0(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
272  int width)
273 {
274  int i;
275 
276  for (i = 0; i < width; i++)
277  b1[i] = (16 * 4 * b1[i] - 4 * (b0[i] + b2[i]) + W_BO * 5 + (5 << 27)) /
278  (5 * 16) - (1 << 23);
279 }
280 
281 static void vertical_decompose97iL1(DWTELEM *b0, DWTELEM *b1, DWTELEM *b2,
282  int width)
283 {
284  int i;
285 
286  for (i = 0; i < width; i++)
287  b1[i] += (W_DM * (b0[i] + b2[i]) + W_DO) >> W_DS;
288 }
289 
290 static void spatial_decompose97i(DWTELEM *buffer, DWTELEM *temp,
291  int width, int height, int stride)
292 {
293  int y;
294  DWTELEM *b0 = buffer + mirror(-4 - 1, height - 1) * stride;
295  DWTELEM *b1 = buffer + mirror(-4, height - 1) * stride;
296  DWTELEM *b2 = buffer + mirror(-4 + 1, height - 1) * stride;
297  DWTELEM *b3 = buffer + mirror(-4 + 2, height - 1) * stride;
298 
299  for (y = -4; y < height; y += 2) {
300  DWTELEM *b4 = buffer + mirror(y + 3, height - 1) * stride;
301  DWTELEM *b5 = buffer + mirror(y + 4, height - 1) * stride;
302 
303  if (y + 3 < (unsigned)height)
304  horizontal_decompose97i(b4, temp, width);
305  if (y + 4 < (unsigned)height)
306  horizontal_decompose97i(b5, temp, width);
307 
308  if (y + 3 < (unsigned)height)
309  vertical_decompose97iH0(b3, b4, b5, width);
310  if (y + 2 < (unsigned)height)
311  vertical_decompose97iL0(b2, b3, b4, width);
312  if (y + 1 < (unsigned)height)
313  vertical_decompose97iH1(b1, b2, b3, width);
314  if (y + 0 < (unsigned)height)
315  vertical_decompose97iL1(b0, b1, b2, width);
316 
317  b0 = b2;
318  b1 = b3;
319  b2 = b4;
320  b3 = b5;
321  }
322 }
323 
324 void ff_spatial_dwt(DWTELEM *buffer, DWTELEM *temp, int width, int height,
325  int stride, int type, int decomposition_count)
326 {
327  int level;
328 
329  for (level = 0; level < decomposition_count; level++) {
330  switch (type) {
331  case DWT_97:
332  spatial_decompose97i(buffer, temp,
333  width >> level, height >> level,
334  stride << level);
335  break;
336  case DWT_53:
337  spatial_decompose53i(buffer, temp,
338  width >> level, height >> level,
339  stride << level);
340  break;
341  }
342  }
343 }
344 
345 static void horizontal_compose53i(IDWTELEM *b, IDWTELEM *temp, int width)
346 {
347  const int width2 = width >> 1;
348  const int w2 = (width + 1) >> 1;
349  int x;
350 
351  for (x = 0; x < width2; x++) {
352  temp[2 * x] = b[x];
353  temp[2 * x + 1] = b[x + w2];
354  }
355  if (width & 1)
356  temp[2 * x] = b[x];
357 
358  b[0] = temp[0] - ((temp[1] + 1) >> 1);
359  for (x = 2; x < width - 1; x += 2) {
360  b[x] = temp[x] - ((temp[x - 1] + temp[x + 1] + 2) >> 2);
361  b[x - 1] = temp[x - 1] + ((b[x - 2] + b[x] + 1) >> 1);
362  }
363  if (width & 1) {
364  b[x] = temp[x] - ((temp[x - 1] + 1) >> 1);
365  b[x - 1] = temp[x - 1] + ((b[x - 2] + b[x] + 1) >> 1);
366  } else
367  b[x - 1] = temp[x - 1] + b[x - 2];
368 }
369 
370 static void vertical_compose53iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
371  int width)
372 {
373  int i;
374 
375  for (i = 0; i < width; i++)
376  b1[i] += (b0[i] + b2[i]) >> 1;
377 }
378 
379 static void vertical_compose53iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
380  int width)
381 {
382  int i;
383 
384  for (i = 0; i < width; i++)
385  b1[i] -= (b0[i] + b2[i] + 2) >> 2;
386 }
387 
388 static void spatial_compose53i_buffered_init(DWTCompose *cs, slice_buffer *sb,
389  int height, int stride_line)
390 {
391  cs->b0 = slice_buffer_get_line(sb,
392  mirror(-1 - 1, height - 1) * stride_line);
393  cs->b1 = slice_buffer_get_line(sb, mirror(-1, height - 1) * stride_line);
394  cs->y = -1;
395 }
396 
397 static void spatial_compose53i_init(DWTCompose *cs, IDWTELEM *buffer,
398  int height, int stride)
399 {
400  cs->b0 = buffer + mirror(-1 - 1, height - 1) * stride;
401  cs->b1 = buffer + mirror(-1, height - 1) * stride;
402  cs->y = -1;
403 }
404 
405 static void spatial_compose53i_dy_buffered(DWTCompose *cs, slice_buffer *sb,
406  IDWTELEM *temp,
407  int width, int height,
408  int stride_line)
409 {
410  int y = cs->y;
411 
412  IDWTELEM *b0 = cs->b0;
413  IDWTELEM *b1 = cs->b1;
414  IDWTELEM *b2 = slice_buffer_get_line(sb,
415  mirror(y + 1, height - 1) *
416  stride_line);
417  IDWTELEM *b3 = slice_buffer_get_line(sb,
418  mirror(y + 2, height - 1) *
419  stride_line);
420 
421  if (y + 1 < (unsigned)height && y < (unsigned)height) {
422  int x;
423 
424  for (x = 0; x < width; x++) {
425  b2[x] -= (b1[x] + b3[x] + 2) >> 2;
426  b1[x] += (b0[x] + b2[x]) >> 1;
427  }
428  } else {
429  if (y + 1 < (unsigned)height)
430  vertical_compose53iL0(b1, b2, b3, width);
431  if (y + 0 < (unsigned)height)
432  vertical_compose53iH0(b0, b1, b2, width);
433  }
434 
435  if (y - 1 < (unsigned)height)
436  horizontal_compose53i(b0, temp, width);
437  if (y + 0 < (unsigned)height)
438  horizontal_compose53i(b1, temp, width);
439 
440  cs->b0 = b2;
441  cs->b1 = b3;
442  cs->y += 2;
443 }
444 
445 static void spatial_compose53i_dy(DWTCompose *cs, IDWTELEM *buffer,
446  IDWTELEM *temp, int width, int height,
447  int stride)
448 {
449  int y = cs->y;
450  IDWTELEM *b0 = cs->b0;
451  IDWTELEM *b1 = cs->b1;
452  IDWTELEM *b2 = buffer + mirror(y + 1, height - 1) * stride;
453  IDWTELEM *b3 = buffer + mirror(y + 2, height - 1) * stride;
454 
455  if (y + 1 < (unsigned)height)
456  vertical_compose53iL0(b1, b2, b3, width);
457  if (y + 0 < (unsigned)height)
458  vertical_compose53iH0(b0, b1, b2, width);
459 
460  if (y - 1 < (unsigned)height)
461  horizontal_compose53i(b0, temp, width);
462  if (y + 0 < (unsigned)height)
463  horizontal_compose53i(b1, temp, width);
464 
465  cs->b0 = b2;
466  cs->b1 = b3;
467  cs->y += 2;
468 }
469 
470 void ff_snow_horizontal_compose97i(IDWTELEM *b, IDWTELEM *temp, int width)
471 {
472  const int w2 = (width + 1) >> 1;
473  int x;
474 
475  temp[0] = b[0] - ((3 * b[w2] + 2) >> 2);
476  for (x = 1; x < (width >> 1); x++) {
477  temp[2 * x] = b[x] - ((3 * (b[x + w2 - 1] + b[x + w2]) + 4) >> 3);
478  temp[2 * x - 1] = b[x + w2 - 1] - temp[2 * x - 2] - temp[2 * x];
479  }
480  if (width & 1) {
481  temp[2 * x] = b[x] - ((3 * b[x + w2 - 1] + 2) >> 2);
482  temp[2 * x - 1] = b[x + w2 - 1] - temp[2 * x - 2] - temp[2 * x];
483  } else
484  temp[2 * x - 1] = b[x + w2 - 1] - 2 * temp[2 * x - 2];
485 
486  b[0] = temp[0] + ((2 * temp[0] + temp[1] + 4) >> 3);
487  for (x = 2; x < width - 1; x += 2) {
488  b[x] = temp[x] + ((4 * temp[x] + temp[x - 1] + temp[x + 1] + 8) >> 4);
489  b[x - 1] = temp[x - 1] + ((3 * (b[x - 2] + b[x])) >> 1);
490  }
491  if (width & 1) {
492  b[x] = temp[x] + ((2 * temp[x] + temp[x - 1] + 4) >> 3);
493  b[x - 1] = temp[x - 1] + ((3 * (b[x - 2] + b[x])) >> 1);
494  } else
495  b[x - 1] = temp[x - 1] + 3 * b[x - 2];
496 }
497 
498 static void vertical_compose97iH0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
499  int width)
500 {
501  int i;
502 
503  for (i = 0; i < width; i++)
504  b1[i] += (W_AM * (b0[i] + b2[i]) + W_AO) >> W_AS;
505 }
506 
507 static void vertical_compose97iH1(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
508  int width)
509 {
510  int i;
511 
512  for (i = 0; i < width; i++)
513  b1[i] -= (W_CM * (b0[i] + b2[i]) + W_CO) >> W_CS;
514 }
515 
516 static void vertical_compose97iL0(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
517  int width)
518 {
519  int i;
520 
521  for (i = 0; i < width; i++)
522  b1[i] += (W_BM * (b0[i] + b2[i]) + 4 * b1[i] + W_BO) >> W_BS;
523 }
524 
525 static void vertical_compose97iL1(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
526  int width)
527 {
528  int i;
529 
530  for (i = 0; i < width; i++)
531  b1[i] -= (W_DM * (b0[i] + b2[i]) + W_DO) >> W_DS;
532 }
533 
534 void ff_snow_vertical_compose97i(IDWTELEM *b0, IDWTELEM *b1, IDWTELEM *b2,
535  IDWTELEM *b3, IDWTELEM *b4, IDWTELEM *b5,
536  int width)
537 {
538  int i;
539 
540  for (i = 0; i < width; i++) {
541  b4[i] -= (W_DM * (b3[i] + b5[i]) + W_DO) >> W_DS;
542  b3[i] -= (W_CM * (b2[i] + b4[i]) + W_CO) >> W_CS;
543  b2[i] += (W_BM * (b1[i] + b3[i]) + 4 * b2[i] + W_BO) >> W_BS;
544  b1[i] += (W_AM * (b0[i] + b2[i]) + W_AO) >> W_AS;
545  }
546 }
547 
548 static void spatial_compose97i_buffered_init(DWTCompose *cs, slice_buffer *sb,
549  int height, int stride_line)
550 {
551  cs->b0 = slice_buffer_get_line(sb, mirror(-3 - 1, height - 1) * stride_line);
552  cs->b1 = slice_buffer_get_line(sb, mirror(-3, height - 1) * stride_line);
553  cs->b2 = slice_buffer_get_line(sb, mirror(-3 + 1, height - 1) * stride_line);
554  cs->b3 = slice_buffer_get_line(sb, mirror(-3 + 2, height - 1) * stride_line);
555  cs->y = -3;
556 }
557 
558 static void spatial_compose97i_init(DWTCompose *cs, IDWTELEM *buffer, int height,
559  int stride)
560 {
561  cs->b0 = buffer + mirror(-3 - 1, height - 1) * stride;
562  cs->b1 = buffer + mirror(-3, height - 1) * stride;
563  cs->b2 = buffer + mirror(-3 + 1, height - 1) * stride;
564  cs->b3 = buffer + mirror(-3 + 2, height - 1) * stride;
565  cs->y = -3;
566 }
567 
568 static void spatial_compose97i_dy_buffered(SnowDWTContext *dsp, DWTCompose *cs,
569  slice_buffer * sb, IDWTELEM *temp,
570  int width, int height,
571  int stride_line)
572 {
573  int y = cs->y;
574 
575  IDWTELEM *b0 = cs->b0;
576  IDWTELEM *b1 = cs->b1;
577  IDWTELEM *b2 = cs->b2;
578  IDWTELEM *b3 = cs->b3;
579  IDWTELEM *b4 = slice_buffer_get_line(sb,
580  mirror(y + 3, height - 1) *
581  stride_line);
582  IDWTELEM *b5 = slice_buffer_get_line(sb,
583  mirror(y + 4, height - 1) *
584  stride_line);
585 
586  if (y > 0 && y + 4 < height) {
587  dsp->vertical_compose97i(b0, b1, b2, b3, b4, b5, width);
588  } else {
589  if (y + 3 < (unsigned)height)
590  vertical_compose97iL1(b3, b4, b5, width);
591  if (y + 2 < (unsigned)height)
592  vertical_compose97iH1(b2, b3, b4, width);
593  if (y + 1 < (unsigned)height)
594  vertical_compose97iL0(b1, b2, b3, width);
595  if (y + 0 < (unsigned)height)
596  vertical_compose97iH0(b0, b1, b2, width);
597  }
598 
599  if (y - 1 < (unsigned)height)
600  dsp->horizontal_compose97i(b0, temp, width);
601  if (y + 0 < (unsigned)height)
602  dsp->horizontal_compose97i(b1, temp, width);
603 
604  cs->b0 = b2;
605  cs->b1 = b3;
606  cs->b2 = b4;
607  cs->b3 = b5;
608  cs->y += 2;
609 }
610 
611 static void spatial_compose97i_dy(DWTCompose *cs, IDWTELEM *buffer,
612  IDWTELEM *temp, int width, int height,
613  int stride)
614 {
615  int y = cs->y;
616  IDWTELEM *b0 = cs->b0;
617  IDWTELEM *b1 = cs->b1;
618  IDWTELEM *b2 = cs->b2;
619  IDWTELEM *b3 = cs->b3;
620  IDWTELEM *b4 = buffer + mirror(y + 3, height - 1) * stride;
621  IDWTELEM *b5 = buffer + mirror(y + 4, height - 1) * stride;
622 
623  if (y + 3 < (unsigned)height)
624  vertical_compose97iL1(b3, b4, b5, width);
625  if (y + 2 < (unsigned)height)
626  vertical_compose97iH1(b2, b3, b4, width);
627  if (y + 1 < (unsigned)height)
628  vertical_compose97iL0(b1, b2, b3, width);
629  if (y + 0 < (unsigned)height)
630  vertical_compose97iH0(b0, b1, b2, width);
631 
632  if (y - 1 < (unsigned)height)
633  ff_snow_horizontal_compose97i(b0, temp, width);
634  if (y + 0 < (unsigned)height)
635  ff_snow_horizontal_compose97i(b1, temp, width);
636 
637  cs->b0 = b2;
638  cs->b1 = b3;
639  cs->b2 = b4;
640  cs->b3 = b5;
641  cs->y += 2;
642 }
643 
644 void ff_spatial_idwt_buffered_init(DWTCompose *cs, slice_buffer *sb, int width,
645  int height, int stride_line, int type,
646  int decomposition_count)
647 {
648  int level;
649  for (level = decomposition_count - 1; level >= 0; level--) {
650  switch (type) {
651  case DWT_97:
652  spatial_compose97i_buffered_init(cs + level, sb, height >> level,
653  stride_line << level);
654  break;
655  case DWT_53:
656  spatial_compose53i_buffered_init(cs + level, sb, height >> level,
657  stride_line << level);
658  break;
659  }
660  }
661 }
662 
663 void ff_spatial_idwt_buffered_slice(SnowDWTContext *dsp, DWTCompose *cs,
664  slice_buffer *slice_buf, IDWTELEM *temp,
665  int width, int height, int stride_line,
666  int type, int decomposition_count, int y)
667 {
668  const int support = type == 1 ? 3 : 5;
669  int level;
670  if (type == 2)
671  return;
672 
673  for (level = decomposition_count - 1; level >= 0; level--)
674  while (cs[level].y <= FFMIN((y >> level) + support, height >> level)) {
675  switch (type) {
676  case DWT_97:
677  spatial_compose97i_dy_buffered(dsp, cs + level, slice_buf, temp,
678  width >> level,
679  height >> level,
680  stride_line << level);
681  break;
682  case DWT_53:
683  spatial_compose53i_dy_buffered(cs + level, slice_buf, temp,
684  width >> level,
685  height >> level,
686  stride_line << level);
687  break;
688  }
689  }
690 }
691 
692 static void ff_spatial_idwt_init(DWTCompose *cs, IDWTELEM *buffer, int width,
693  int height, int stride, int type,
694  int decomposition_count)
695 {
696  int level;
697  for (level = decomposition_count - 1; level >= 0; level--) {
698  switch (type) {
699  case DWT_97:
700  spatial_compose97i_init(cs + level, buffer, height >> level,
701  stride << level);
702  break;
703  case DWT_53:
704  spatial_compose53i_init(cs + level, buffer, height >> level,
705  stride << level);
706  break;
707  }
708  }
709 }
710 
711 static void ff_spatial_idwt_slice(DWTCompose *cs, IDWTELEM *buffer,
712  IDWTELEM *temp, int width, int height,
713  int stride, int type,
714  int decomposition_count, int y)
715 {
716  const int support = type == 1 ? 3 : 5;
717  int level;
718  if (type == 2)
719  return;
720 
721  for (level = decomposition_count - 1; level >= 0; level--)
722  while (cs[level].y <= FFMIN((y >> level) + support, height >> level)) {
723  switch (type) {
724  case DWT_97:
725  spatial_compose97i_dy(cs + level, buffer, temp, width >> level,
726  height >> level, stride << level);
727  break;
728  case DWT_53:
729  spatial_compose53i_dy(cs + level, buffer, temp, width >> level,
730  height >> level, stride << level);
731  break;
732  }
733  }
734 }
735 
736 void ff_spatial_idwt(IDWTELEM *buffer, IDWTELEM *temp, int width, int height,
737  int stride, int type, int decomposition_count)
738 {
739  DWTCompose cs[MAX_DECOMPOSITIONS];
740  int y;
741  ff_spatial_idwt_init(cs, buffer, width, height, stride, type,
742  decomposition_count);
743  for (y = 0; y < height; y += 4)
744  ff_spatial_idwt_slice(cs, buffer, temp, width, height, stride, type,
745  decomposition_count, y);
746 }
747 
748 static inline int w_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size,
749  int w, int h, int type)
750 {
751  int s, i, j;
752  const int dec_count = w == 8 ? 3 : 4;
753  int tmp[32 * 32], tmp2[32];
754  int level, ori;
755  static const int scale[2][2][4][4] = {
756  {
757  { // 9/7 8x8 dec=3
758  { 268, 239, 239, 213 },
759  { 0, 224, 224, 152 },
760  { 0, 135, 135, 110 },
761  },
762  { // 9/7 16x16 or 32x32 dec=4
763  { 344, 310, 310, 280 },
764  { 0, 320, 320, 228 },
765  { 0, 175, 175, 136 },
766  { 0, 129, 129, 102 },
767  }
768  },
769  {
770  { // 5/3 8x8 dec=3
771  { 275, 245, 245, 218 },
772  { 0, 230, 230, 156 },
773  { 0, 138, 138, 113 },
774  },
775  { // 5/3 16x16 or 32x32 dec=4
776  { 352, 317, 317, 286 },
777  { 0, 328, 328, 233 },
778  { 0, 180, 180, 140 },
779  { 0, 132, 132, 105 },
780  }
781  }
782  };
783 
784  for (i = 0; i < h; i++) {
785  for (j = 0; j < w; j += 4) {
786  tmp[32 * i + j + 0] = (pix1[j + 0] - pix2[j + 0]) << 4;
787  tmp[32 * i + j + 1] = (pix1[j + 1] - pix2[j + 1]) << 4;
788  tmp[32 * i + j + 2] = (pix1[j + 2] - pix2[j + 2]) << 4;
789  tmp[32 * i + j + 3] = (pix1[j + 3] - pix2[j + 3]) << 4;
790  }
791  pix1 += line_size;
792  pix2 += line_size;
793  }
794 
795  ff_spatial_dwt(tmp, tmp2, w, h, 32, type, dec_count);
796 
797  s = 0;
798  av_assert1(w == h);
799  for (level = 0; level < dec_count; level++)
800  for (ori = level ? 1 : 0; ori < 4; ori++) {
801  int size = w >> (dec_count - level);
802  int sx = (ori & 1) ? size : 0;
803  int stride = 32 << (dec_count - level);
804  int sy = (ori & 2) ? stride >> 1 : 0;
805 
806  for (i = 0; i < size; i++)
807  for (j = 0; j < size; j++) {
808  int v = tmp[sx + sy + i * stride + j] *
809  scale[type][dec_count - 3][level][ori];
810  s += FFABS(v);
811  }
812  }
813  av_assert1(s >= 0);
814  return s >> 9;
815 }
816 
817 static int w53_8_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
818 {
819  return w_c(v, pix1, pix2, line_size, 8, h, 1);
820 }
821 
822 static int w97_8_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
823 {
824  return w_c(v, pix1, pix2, line_size, 8, h, 0);
825 }
826 
827 static int w53_16_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
828 {
829  return w_c(v, pix1, pix2, line_size, 16, h, 1);
830 }
831 
832 static int w97_16_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
833 {
834  return w_c(v, pix1, pix2, line_size, 16, h, 0);
835 }
836 
837 int ff_w53_32_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
838 {
839  return w_c(v, pix1, pix2, line_size, 32, h, 1);
840 }
841 
842 int ff_w97_32_c(void *v, uint8_t *pix1, uint8_t *pix2, int line_size, int h)
843 {
844  return w_c(v, pix1, pix2, line_size, 32, h, 0);
845 }
846 
847 void ff_dsputil_init_dwt(DSPContext *c)
848 {
849  c->w53[0] = w53_16_c;
850  c->w53[1] = w53_8_c;
851  c->w97[0] = w97_16_c;
852  c->w97[1] = w97_8_c;
853 }
854 
855 void ff_dwt_init(SnowDWTContext *c)
856 {
857  c->vertical_compose97i = ff_snow_vertical_compose97i;
858  c->horizontal_compose97i = ff_snow_horizontal_compose97i;
859  c->inner_add_yblock = ff_snow_inner_add_yblock;
860 
861  if (HAVE_MMX)
862  ff_dwt_init_x86(c);
863 }
864 
865 
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