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FFmpeg/libavcodec/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_array(line_count, sizeof(IDWTELEM *));

  39.     if (!buf->line)

  40.         return AVERROR(ENOMEM);

  41.     buf->data_stack  = av_malloc_array(max_allocated_lines, sizeof(IDWTELEM *));

  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_array(line_width, sizeof(IDWTELEM));

  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(struct MpegEncContext *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(struct MpegEncContext *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(struct MpegEncContext *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(struct MpegEncContext *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(struct MpegEncContext *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(struct MpegEncContext *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(struct MpegEncContext *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.