vp8/common/loopfilter.c

   1 /*
   2  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11
  12 #include "vpx_ports/config.h"
  13 #include "loopfilter.h"
  14 #include "onyxc_int.h"
  15
  16 typedef unsigned char uc;
  17
  18
  19 prototype_loopfilter(vp8_loop_filter_horizontal_edge_c);
  20 prototype_loopfilter(vp8_loop_filter_vertical_edge_c);
  21 prototype_loopfilter(vp8_mbloop_filter_horizontal_edge_c);
  22 prototype_loopfilter(vp8_mbloop_filter_vertical_edge_c);
  23 prototype_loopfilter(vp8_loop_filter_simple_horizontal_edge_c);
  24 prototype_loopfilter(vp8_loop_filter_simple_vertical_edge_c);
  25
  26 // Horizontal MB filtering
  27 void vp8_loop_filter_mbh_c(unsigned char *y_ptr, unsigned char *u_ptr, unsigned char *v_ptr,
  28                            int y_stride, int uv_stride, loop_filter_info *lfi, int simpler_lpf)
  29 {
  30     (void) simpler_lpf;
  31     vp8_mbloop_filter_horizontal_edge_c(y_ptr, y_stride, lfi->mbflim, lfi->lim, lfi->mbthr, 2);
  32
  33     if (u_ptr)
  34         vp8_mbloop_filter_horizontal_edge_c(u_ptr, uv_stride, lfi->uvmbflim, lfi->uvlim, lfi->uvmbthr, 1);
  35
  36     if (v_ptr)
  37         vp8_mbloop_filter_horizontal_edge_c(v_ptr, uv_stride, lfi->uvmbflim, lfi->uvlim, lfi->uvmbthr, 1);
  38 }
  39
  40 void vp8_loop_filter_mbhs_c(unsigned char *y_ptr, unsigned char *u_ptr, unsigned char *v_ptr,
  41                             int y_stride, int uv_stride, loop_filter_info *lfi, int simpler_lpf)
  42 {
  43     (void) u_ptr;
  44     (void) v_ptr;
  45     (void) uv_stride;
  46     (void) simpler_lpf;
  47     vp8_loop_filter_simple_horizontal_edge_c(y_ptr, y_stride, lfi->mbflim, lfi->lim, lfi->mbthr, 2);
  48 }
  49
  50 // Vertical MB Filtering
  51 void vp8_loop_filter_mbv_c(unsigned char *y_ptr, unsigned char *u_ptr, unsigned char *v_ptr,
  52                            int y_stride, int uv_stride, loop_filter_info *lfi, int simpler_lpf)
  53 {
  54     (void) simpler_lpf;
  55     vp8_mbloop_filter_vertical_edge_c(y_ptr, y_stride, lfi->mbflim, lfi->lim, lfi->mbthr, 2);
  56
  57     if (u_ptr)
  58         vp8_mbloop_filter_vertical_edge_c(u_ptr, uv_stride, lfi->uvmbflim, lfi->uvlim, lfi->uvmbthr, 1);
  59
  60     if (v_ptr)
  61         vp8_mbloop_filter_vertical_edge_c(v_ptr, uv_stride, lfi->uvmbflim, lfi->uvlim, lfi->uvmbthr, 1);
  62 }
  63
  64 void vp8_loop_filter_mbvs_c(unsigned char *y_ptr, unsigned char *u_ptr, unsigned char *v_ptr,
  65                             int y_stride, int uv_stride, loop_filter_info *lfi, int simpler_lpf)
  66 {
  67     (void) u_ptr;
  68     (void) v_ptr;
  69     (void) uv_stride;
  70     (void) simpler_lpf;
  71     vp8_loop_filter_simple_vertical_edge_c(y_ptr, y_stride, lfi->mbflim, lfi->lim, lfi->mbthr, 2);
  72 }
  73
  74 // Horizontal B Filtering
  75 void vp8_loop_filter_bh_c(unsigned char *y_ptr, unsigned char *u_ptr, unsigned char *v_ptr,
  76                           int y_stride, int uv_stride, loop_filter_info *lfi, int simpler_lpf)
  77 {
  78     (void) simpler_lpf;
  79     vp8_loop_filter_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
  80     vp8_loop_filter_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
  81     vp8_loop_filter_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
  82
  83     if (u_ptr)
  84         vp8_loop_filter_horizontal_edge_c(u_ptr + 4 * uv_stride, uv_stride, lfi->uvflim, lfi->uvlim, lfi->uvthr, 1);
  85
  86     if (v_ptr)
  87         vp8_loop_filter_horizontal_edge_c(v_ptr + 4 * uv_stride, uv_stride, lfi->uvflim, lfi->uvlim, lfi->uvthr, 1);
  88 }
  89
  90 void vp8_loop_filter_bhs_c(unsigned char *y_ptr, unsigned char *u_ptr, unsigned char *v_ptr,
  91                            int y_stride, int uv_stride, loop_filter_info *lfi, int simpler_lpf)
  92 {
  93     (void) u_ptr;
  94     (void) v_ptr;
  95     (void) uv_stride;
  96     (void) simpler_lpf;
  97     vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 4 * y_stride, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
  98     vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 8 * y_stride, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
  99     vp8_loop_filter_simple_horizontal_edge_c(y_ptr + 12 * y_stride, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
 100 }
 101
 102 // Vertical B Filtering
 103 void vp8_loop_filter_bv_c(unsigned char *y_ptr, unsigned char *u_ptr, unsigned char *v_ptr,
 104                           int y_stride, int uv_stride, loop_filter_info *lfi, int simpler_lpf)
 105 {
 106     (void) simpler_lpf;
 107     vp8_loop_filter_vertical_edge_c(y_ptr + 4, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
 108     vp8_loop_filter_vertical_edge_c(y_ptr + 8, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
 109     vp8_loop_filter_vertical_edge_c(y_ptr + 12, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
 110
 111     if (u_ptr)
 112         vp8_loop_filter_vertical_edge_c(u_ptr + 4, uv_stride, lfi->uvflim, lfi->uvlim, lfi->uvthr, 1);
 113
 114     if (v_ptr)
 115         vp8_loop_filter_vertical_edge_c(v_ptr + 4, uv_stride, lfi->uvflim, lfi->uvlim, lfi->uvthr, 1);
 116 }
 117
 118 void vp8_loop_filter_bvs_c(unsigned char *y_ptr, unsigned char *u_ptr, unsigned char *v_ptr,
 119                            int y_stride, int uv_stride, loop_filter_info *lfi, int simpler_lpf)
 120 {
 121     (void) u_ptr;
 122     (void) v_ptr;
 123     (void) uv_stride;
 124     (void) simpler_lpf;
 125     vp8_loop_filter_simple_vertical_edge_c(y_ptr + 4, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
 126     vp8_loop_filter_simple_vertical_edge_c(y_ptr + 8, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
 127     vp8_loop_filter_simple_vertical_edge_c(y_ptr + 12, y_stride, lfi->flim, lfi->lim, lfi->thr, 2);
 128 }
 129
 130 void vp8_init_loop_filter(VP8_COMMON *cm)
 131 {
 132     loop_filter_info *lfi = cm->lf_info;
 133     LOOPFILTERTYPE lft = cm->filter_type;
 134     int sharpness_lvl = cm->sharpness_level;
 135     int frame_type = cm->frame_type;
 136     int i, j;
 137
 138     int block_inside_limit = 0;
 139     int HEVThresh;
 140     const int yhedge_boost  = 2;
 141     const int uvhedge_boost = 2;
 142
 143     // For each possible value for the loop filter fill out a "loop_filter_info" entry.
 144     for (i = 0; i <= MAX_LOOP_FILTER; i++)
 145     {
 146         int filt_lvl = i;
 147
 148         if (frame_type == KEY_FRAME)
 149         {
 150             if (filt_lvl >= 40)
 151                 HEVThresh = 2;
 152             else if (filt_lvl >= 15)
 153                 HEVThresh = 1;
 154             else
 155                 HEVThresh = 0;
 156         }
 157         else
 158         {
 159             if (filt_lvl >= 40)
 160                 HEVThresh = 3;
 161             else if (filt_lvl >= 20)
 162                 HEVThresh = 2;
 163             else if (filt_lvl >= 15)
 164                 HEVThresh = 1;
 165             else
 166                 HEVThresh = 0;
 167         }
 168
 169         // Set loop filter paramaeters that control sharpness.
 170         block_inside_limit = filt_lvl >> (sharpness_lvl > 0);
 171         block_inside_limit = block_inside_limit >> (sharpness_lvl > 4);
 172
 173         if (sharpness_lvl > 0)
 174         {
 175             if (block_inside_limit > (9 - sharpness_lvl))
 176                 block_inside_limit = (9 - sharpness_lvl);
 177         }
 178
 179         if (block_inside_limit < 1)
 180             block_inside_limit = 1;
 181
 182         for (j = 0; j < 16; j++)
 183         {
 184             lfi[i].lim[j] = block_inside_limit;
 185             lfi[i].mbflim[j] = filt_lvl + yhedge_boost;
 186             lfi[i].mbthr[j] = HEVThresh;
 187             lfi[i].flim[j] = filt_lvl;
 188             lfi[i].thr[j] = HEVThresh;
 189             lfi[i].uvlim[j] = block_inside_limit;
 190             lfi[i].uvmbflim[j] = filt_lvl + uvhedge_boost;
 191             lfi[i].uvmbthr[j] = HEVThresh;
 192             lfi[i].uvflim[j] = filt_lvl;
 193             lfi[i].uvthr[j] = HEVThresh;
 194         }
 195
 196     }
 197
 198     // Set up the function pointers depending on the type of loop filtering selected
 199     if (lft == NORMAL_LOOPFILTER)
 200     {
 201         cm->lf_mbv = LF_INVOKE(&cm->rtcd.loopfilter, normal_mb_v);
 202         cm->lf_bv  = LF_INVOKE(&cm->rtcd.loopfilter, normal_b_v);
 203         cm->lf_mbh = LF_INVOKE(&cm->rtcd.loopfilter, normal_mb_h);
 204         cm->lf_bh  = LF_INVOKE(&cm->rtcd.loopfilter, normal_b_h);
 205     }
 206     else
 207     {
 208         cm->lf_mbv = LF_INVOKE(&cm->rtcd.loopfilter, simple_mb_v);
 209         cm->lf_bv  = LF_INVOKE(&cm->rtcd.loopfilter, simple_b_v);
 210         cm->lf_mbh = LF_INVOKE(&cm->rtcd.loopfilter, simple_mb_h);
 211         cm->lf_bh  = LF_INVOKE(&cm->rtcd.loopfilter, simple_b_h);
 212     }
 213 }
 214
 215 // Put vp8_init_loop_filter() in vp8dx_create_decompressor(). Only call vp8_frame_init_loop_filter() while decoding
 216 // each frame. Check last_frame_type to skip the function most of times.
 217 void vp8_frame_init_loop_filter(loop_filter_info *lfi, int frame_type)
 218 {
 219     int HEVThresh;
 220     int i, j;
 221
 222     // For each possible value for the loop filter fill out a "loop_filter_info" entry.
 223     for (i = 0; i <= MAX_LOOP_FILTER; i++)
 224     {
 225         int filt_lvl = i;
 226
 227         if (frame_type == KEY_FRAME)
 228         {
 229             if (filt_lvl >= 40)
 230                 HEVThresh = 2;
 231             else if (filt_lvl >= 15)
 232                 HEVThresh = 1;
 233             else
 234                 HEVThresh = 0;
 235         }
 236         else
 237         {
 238             if (filt_lvl >= 40)
 239                 HEVThresh = 3;
 240             else if (filt_lvl >= 20)
 241                 HEVThresh = 2;
 242             else if (filt_lvl >= 15)
 243                 HEVThresh = 1;
 244             else
 245                 HEVThresh = 0;
 246         }
 247
 248         for (j = 0; j < 16; j++)
 249         {
 250             //lfi[i].lim[j] = block_inside_limit;
 251             //lfi[i].mbflim[j] = filt_lvl+yhedge_boost;
 252             lfi[i].mbthr[j] = HEVThresh;
 253             //lfi[i].flim[j] = filt_lvl;
 254             lfi[i].thr[j] = HEVThresh;
 255             //lfi[i].uvlim[j] = block_inside_limit;
 256             //lfi[i].uvmbflim[j] = filt_lvl+uvhedge_boost;
 257             lfi[i].uvmbthr[j] = HEVThresh;
 258             //lfi[i].uvflim[j] = filt_lvl;
 259             lfi[i].uvthr[j] = HEVThresh;
 260         }
 261     }
 262 }
 263
 264
 265 void vp8_adjust_mb_lf_value(MACROBLOCKD *mbd, int *filter_level)
 266 {
 267     MB_MODE_INFO *mbmi = &mbd->mode_info_context->mbmi;
 268
 269     if (mbd->mode_ref_lf_delta_enabled)
 270     {
 271         // Aplly delta for reference frame
 272         *filter_level += mbd->ref_lf_deltas[mbmi->ref_frame];
 273
 274         // Apply delta for mode
 275         if (mbmi->ref_frame == INTRA_FRAME)
 276         {
 277             // Only the split mode BPRED has a further special case
 278             if (mbmi->mode == B_PRED)
 279                 *filter_level +=  mbd->mode_lf_deltas[0];
 280         }
 281         else
 282         {
 283             // Zero motion mode
 284             if (mbmi->mode == ZEROMV)
 285                 *filter_level +=  mbd->mode_lf_deltas[1];
 286
 287             // Split MB motion mode
 288             else if (mbmi->mode == SPLITMV)
 289                 *filter_level +=  mbd->mode_lf_deltas[3];
 290
 291             // All other inter motion modes (Nearest, Near, New)
 292             else
 293                 *filter_level +=  mbd->mode_lf_deltas[2];
 294         }
 295
 296         // Range check
 297         if (*filter_level > MAX_LOOP_FILTER)
 298             *filter_level = MAX_LOOP_FILTER;
 299         else if (*filter_level < 0)
 300             *filter_level = 0;
 301     }
 302 }
 303
 304
 305 void vp8_loop_filter_frame
 306 (
 307     VP8_COMMON *cm,
 308     MACROBLOCKD *mbd,
 309     int default_filt_lvl
 310 )
 311 {
 312     YV12_BUFFER_CONFIG *post = cm->frame_to_show;
 313     loop_filter_info *lfi = cm->lf_info;
 314     int frame_type = cm->frame_type;
 315
 316     int mb_row;
 317     int mb_col;
 318
 319
 320     int baseline_filter_level[MAX_MB_SEGMENTS];
 321     int filter_level;
 322     int alt_flt_enabled = mbd->segmentation_enabled;
 323
 324     int i;
 325     unsigned char *y_ptr, *u_ptr, *v_ptr;
 326
 327     mbd->mode_info_context = cm->mi;          // Point at base of Mb MODE_INFO list
 328
 329     // Note the baseline filter values for each segment
 330     if (alt_flt_enabled)
 331     {
 332         for (i = 0; i < MAX_MB_SEGMENTS; i++)
 333         {
 334             // Abs value
 335             if (mbd->mb_segement_abs_delta == SEGMENT_ABSDATA)
 336                 baseline_filter_level[i] = mbd->segment_feature_data[MB_LVL_ALT_LF][i];
 337             // Delta Value
 338             else
 339             {
 340                 baseline_filter_level[i] = default_filt_lvl + mbd->segment_feature_data[MB_LVL_ALT_LF][i];
 341                 baseline_filter_level[i] = (baseline_filter_level[i] >= 0) ? ((baseline_filter_level[i] <= MAX_LOOP_FILTER) ? baseline_filter_level[i] : MAX_LOOP_FILTER) : 0;  // Clamp to valid range
 342             }
 343         }
 344     }
 345     else
 346     {
 347         for (i = 0; i < MAX_MB_SEGMENTS; i++)
 348             baseline_filter_level[i] = default_filt_lvl;
 349     }
 350
 351     // Initialize the loop filter for this frame.
 352     if ((cm->last_filter_type != cm->filter_type) || (cm->last_sharpness_level != cm->sharpness_level))
 353         vp8_init_loop_filter(cm);
 354     else if (frame_type != cm->last_frame_type)
 355         vp8_frame_init_loop_filter(lfi, frame_type);
 356
 357     // Set up the buffer pointers
 358     y_ptr = post->y_buffer;
 359     u_ptr = post->u_buffer;
 360     v_ptr = post->v_buffer;
 361
 362     // vp8_filter each macro block
 363     for (mb_row = 0; mb_row < cm->mb_rows; mb_row++)
 364     {
 365         for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)
 366         {
 367             int Segment = (alt_flt_enabled) ? mbd->mode_info_context->mbmi.segment_id : 0;
 368
 369             filter_level = baseline_filter_level[Segment];
 370
 371             // Distance of Mb to the various image edges.
 372             // These specified to 8th pel as they are always compared to values that are in 1/8th pel units
 373             // Apply any context driven MB level adjustment
 374             vp8_adjust_mb_lf_value(mbd, &filter_level);
 375
 376             if (filter_level)
 377             {
 378                 if (mb_col > 0)
 379                     cm->lf_mbv(y_ptr, u_ptr, v_ptr, post->y_stride, post->uv_stride, &lfi[filter_level], cm->simpler_lpf);
 380
 381                 if (mbd->mode_info_context->mbmi.dc_diff > 0)
 382                     cm->lf_bv(y_ptr, u_ptr, v_ptr, post->y_stride, post->uv_stride, &lfi[filter_level], cm->simpler_lpf);
 383
 384                 // don't apply across umv border
 385                 if (mb_row > 0)
 386                     cm->lf_mbh(y_ptr, u_ptr, v_ptr, post->y_stride, post->uv_stride, &lfi[filter_level], cm->simpler_lpf);
 387
 388                 if (mbd->mode_info_context->mbmi.dc_diff > 0)
 389                     cm->lf_bh(y_ptr, u_ptr, v_ptr, post->y_stride, post->uv_stride, &lfi[filter_level], cm->simpler_lpf);
 390             }
 391
 392             y_ptr += 16;
 393             u_ptr += 8;
 394             v_ptr += 8;
 395
 396             mbd->mode_info_context++;     // step to next MB
 397         }
 398
 399         y_ptr += post->y_stride  * 16 - post->y_width;
 400         u_ptr += post->uv_stride *  8 - post->uv_width;
 401         v_ptr += post->uv_stride *  8 - post->uv_width;
 402
 403         mbd->mode_info_context++;         // Skip border mb
 404     }
 405 }
 406
 407
 408 void vp8_loop_filter_frame_yonly
 409 (
 410     VP8_COMMON *cm,
 411     MACROBLOCKD *mbd,
 412     int default_filt_lvl,
 413     int sharpness_lvl
 414 )
 415 {
 416     YV12_BUFFER_CONFIG *post = cm->frame_to_show;
 417
 418     int i;
 419     unsigned char *y_ptr;
 420     int mb_row;
 421     int mb_col;
 422
 423     loop_filter_info *lfi = cm->lf_info;
 424     int baseline_filter_level[MAX_MB_SEGMENTS];
 425     int filter_level;
 426     int alt_flt_enabled = mbd->segmentation_enabled;
 427     int frame_type = cm->frame_type;
 428
 429     (void) sharpness_lvl;
 430
 431     //MODE_INFO * this_mb_mode_info = cm->mi;  // Point at base of Mb MODE_INFO list
 432     mbd->mode_info_context = cm->mi;          // Point at base of Mb MODE_INFO list
 433
 434     // Note the baseline filter values for each segment
 435     if (alt_flt_enabled)
 436     {
 437         for (i = 0; i < MAX_MB_SEGMENTS; i++)
 438         {
 439             // Abs value
 440             if (mbd->mb_segement_abs_delta == SEGMENT_ABSDATA)
 441                 baseline_filter_level[i] = mbd->segment_feature_data[MB_LVL_ALT_LF][i];
 442             // Delta Value
 443             else
 444             {
 445                 baseline_filter_level[i] = default_filt_lvl + mbd->segment_feature_data[MB_LVL_ALT_LF][i];
 446                 baseline_filter_level[i] = (baseline_filter_level[i] >= 0) ? ((baseline_filter_level[i] <= MAX_LOOP_FILTER) ? baseline_filter_level[i] : MAX_LOOP_FILTER) : 0;  // Clamp to valid range
 447             }
 448         }
 449     }
 450     else
 451     {
 452         for (i = 0; i < MAX_MB_SEGMENTS; i++)
 453             baseline_filter_level[i] = default_filt_lvl;
 454     }
 455
 456     // Initialize the loop filter for this frame.
 457     if ((cm->last_filter_type != cm->filter_type) || (cm->last_sharpness_level != cm->sharpness_level))
 458         vp8_init_loop_filter(cm);
 459     else if (frame_type != cm->last_frame_type)
 460         vp8_frame_init_loop_filter(lfi, frame_type);
 461
 462     // Set up the buffer pointers
 463     y_ptr = post->y_buffer;
 464
 465     // vp8_filter each macro block
 466     for (mb_row = 0; mb_row < cm->mb_rows; mb_row++)
 467     {
 468         for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)
 469         {
 470             int Segment = (alt_flt_enabled) ? mbd->mode_info_context->mbmi.segment_id : 0;
 471             filter_level = baseline_filter_level[Segment];
 472
 473             // Apply any context driven MB level adjustment
 474             vp8_adjust_mb_lf_value(mbd, &filter_level);
 475
 476             if (filter_level)
 477             {
 478                 if (mb_col > 0)
 479                     cm->lf_mbv(y_ptr, 0, 0, post->y_stride, 0, &lfi[filter_level], 0);
 480
 481                 if (mbd->mode_info_context->mbmi.dc_diff > 0)
 482                     cm->lf_bv(y_ptr, 0, 0, post->y_stride, 0, &lfi[filter_level], 0);
 483
 484                 // don't apply across umv border
 485                 if (mb_row > 0)
 486                     cm->lf_mbh(y_ptr, 0, 0, post->y_stride, 0, &lfi[filter_level], 0);
 487
 488                 if (mbd->mode_info_context->mbmi.dc_diff > 0)
 489                     cm->lf_bh(y_ptr, 0, 0, post->y_stride, 0, &lfi[filter_level], 0);
 490             }
 491
 492             y_ptr += 16;
 493             mbd->mode_info_context ++;        // step to next MB
 494
 495         }
 496
 497         y_ptr += post->y_stride  * 16 - post->y_width;
 498         mbd->mode_info_context ++;            // Skip border mb
 499     }
 500
 501 }
 502
 503
 504 void vp8_loop_filter_partial_frame
 505 (
 506     VP8_COMMON *cm,
 507     MACROBLOCKD *mbd,
 508     int default_filt_lvl,
 509     int sharpness_lvl,
 510     int Fraction
 511 )
 512 {
 513     YV12_BUFFER_CONFIG *post = cm->frame_to_show;
 514
 515     int i;
 516     unsigned char *y_ptr;
 517     int mb_row;
 518     int mb_col;
 519     //int mb_rows = post->y_height >> 4;
 520     int mb_cols = post->y_width  >> 4;
 521
 522     int linestocopy;
 523
 524     loop_filter_info *lfi = cm->lf_info;
 525     int baseline_filter_level[MAX_MB_SEGMENTS];
 526     int filter_level;
 527     int alt_flt_enabled = mbd->segmentation_enabled;
 528     int frame_type = cm->frame_type;
 529
 530     (void) sharpness_lvl;
 531
 532     //MODE_INFO * this_mb_mode_info = cm->mi + (post->y_height>>5) * (mb_cols + 1);  // Point at base of Mb MODE_INFO list
 533     mbd->mode_info_context = cm->mi + (post->y_height >> 5) * (mb_cols + 1);        // Point at base of Mb MODE_INFO list
 534
 535     linestocopy = (post->y_height >> (4 + Fraction));
 536
 537     if (linestocopy < 1)
 538         linestocopy = 1;
 539
 540     linestocopy <<= 4;
 541
 542     // Note the baseline filter values for each segment
 543     if (alt_flt_enabled)
 544     {
 545         for (i = 0; i < MAX_MB_SEGMENTS; i++)
 546         {
 547             // Abs value
 548             if (mbd->mb_segement_abs_delta == SEGMENT_ABSDATA)
 549                 baseline_filter_level[i] = mbd->segment_feature_data[MB_LVL_ALT_LF][i];
 550             // Delta Value
 551             else
 552             {
 553                 baseline_filter_level[i] = default_filt_lvl + mbd->segment_feature_data[MB_LVL_ALT_LF][i];
 554                 baseline_filter_level[i] = (baseline_filter_level[i] >= 0) ? ((baseline_filter_level[i] <= MAX_LOOP_FILTER) ? baseline_filter_level[i] : MAX_LOOP_FILTER) : 0;  // Clamp to valid range
 555             }
 556         }
 557     }
 558     else
 559     {
 560         for (i = 0; i < MAX_MB_SEGMENTS; i++)
 561             baseline_filter_level[i] = default_filt_lvl;
 562     }
 563
 564     // Initialize the loop filter for this frame.
 565     if ((cm->last_filter_type != cm->filter_type) || (cm->last_sharpness_level != cm->sharpness_level))
 566         vp8_init_loop_filter(cm);
 567     else if (frame_type != cm->last_frame_type)
 568         vp8_frame_init_loop_filter(lfi, frame_type);
 569
 570     // Set up the buffer pointers
 571     y_ptr = post->y_buffer + (post->y_height >> 5) * 16 * post->y_stride;
 572
 573     // vp8_filter each macro block
 574     for (mb_row = 0; mb_row<(linestocopy >> 4); mb_row++)
 575     {
 576         for (mb_col = 0; mb_col < mb_cols; mb_col++)
 577         {
 578             int Segment = (alt_flt_enabled) ? mbd->mode_info_context->mbmi.segment_id : 0;
 579             filter_level = baseline_filter_level[Segment];
 580
 581             if (filter_level)
 582             {
 583                 if (mb_col > 0)
 584                     cm->lf_mbv(y_ptr, 0, 0, post->y_stride, 0, &lfi[filter_level], 0);
 585
 586                 if (mbd->mode_info_context->mbmi.dc_diff > 0)
 587                     cm->lf_bv(y_ptr, 0, 0, post->y_stride, 0, &lfi[filter_level], 0);
 588
 589                 cm->lf_mbh(y_ptr, 0, 0, post->y_stride, 0, &lfi[filter_level], 0);
 590
 591                 if (mbd->mode_info_context->mbmi.dc_diff > 0)
 592                     cm->lf_bh(y_ptr, 0, 0, post->y_stride, 0, &lfi[filter_level], 0);
 593             }
 594
 595             y_ptr += 16;
 596             mbd->mode_info_context += 1;      // step to next MB
 597         }
 598
 599         y_ptr += post->y_stride  * 16 - post->y_width;
 600         mbd->mode_info_context += 1;          // Skip border mb
 601     }
 602 }