vp8/encoder/ethreading.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 #include "onyx_int.h"
  12 #include "vp8/common/threading.h"
  13 #include "vp8/common/common.h"
  14 #include "vp8/common/extend.h"
  15
  16 #if CONFIG_MULTITHREAD
  17
  18 extern int vp8cx_encode_inter_macroblock(VP8_COMP *cpi, MACROBLOCK *x,
  19                                          TOKENEXTRA **t, int recon_yoffset,
  20                                          int recon_uvoffset);
  21 extern int vp8cx_encode_intra_macro_block(VP8_COMP *cpi, MACROBLOCK *x,
  22                                           TOKENEXTRA **t);
  23 extern void vp8cx_mb_init_quantizer(VP8_COMP *cpi, MACROBLOCK *x);
  24 extern void vp8_build_block_offsets(MACROBLOCK *x);
  25 extern void vp8_setup_block_ptrs(MACROBLOCK *x);
  26
  27 static
  28 THREAD_FUNCTION thread_encoding_proc(void *p_data)
  29 {
  30     int ithread = ((ENCODETHREAD_DATA *)p_data)->ithread;
  31     VP8_COMP *cpi = (VP8_COMP *)(((ENCODETHREAD_DATA *)p_data)->ptr1);
  32     MB_ROW_COMP *mbri = (MB_ROW_COMP *)(((ENCODETHREAD_DATA *)p_data)->ptr2);
  33     ENTROPY_CONTEXT_PLANES mb_row_left_context;
  34
  35     const int nsync = cpi->mt_sync_range;
  36     //printf("Started thread %d\n", ithread);
  37
  38     while (1)
  39     {
  40         if (cpi->b_multi_threaded == 0)
  41             break;
  42
  43         //if(WaitForSingleObject(cpi->h_event_mbrencoding[ithread], INFINITE) == WAIT_OBJECT_0)
  44         if (sem_wait(&cpi->h_event_start_encoding[ithread]) == 0)
  45         {
  46             VP8_COMMON *cm = &cpi->common;
  47             int mb_row;
  48             MACROBLOCK *x = &mbri->mb;
  49             MACROBLOCKD *xd = &x->e_mbd;
  50             TOKENEXTRA *tp ;
  51
  52             int *segment_counts = mbri->segment_counts;
  53             int *totalrate = &mbri->totalrate;
  54
  55             if (cpi->b_multi_threaded == FALSE) // we're shutting down
  56                 break;
  57
  58             for (mb_row = ithread + 1; mb_row < cm->mb_rows; mb_row += (cpi->encoding_thread_count + 1))
  59             {
  60
  61                 int i;
  62                 int recon_yoffset, recon_uvoffset;
  63                 int mb_col;
  64                 int ref_fb_idx = cm->lst_fb_idx;
  65                 int dst_fb_idx = cm->new_fb_idx;
  66                 int recon_y_stride = cm->yv12_fb[ref_fb_idx].y_stride;
  67                 int recon_uv_stride = cm->yv12_fb[ref_fb_idx].uv_stride;
  68                 volatile int *last_row_current_mb_col;
  69                 INT64 activity_sum = 0;
  70
  71                 tp = cpi->tok + (mb_row * (cm->mb_cols * 16 * 24));
  72
  73                 last_row_current_mb_col = &cpi->mt_current_mb_col[mb_row - 1];
  74
  75                 // reset above block coeffs
  76                 xd->above_context = cm->above_context;
  77                 xd->left_context = &mb_row_left_context;
  78
  79                 vp8_zero(mb_row_left_context);
  80
  81                 xd->up_available = (mb_row != 0);
  82                 recon_yoffset = (mb_row * recon_y_stride * 16);
  83                 recon_uvoffset = (mb_row * recon_uv_stride * 8);
  84
  85                 cpi->tplist[mb_row].start = tp;
  86
  87                 //printf("Thread mb_row = %d\n", mb_row);
  88
  89                 // for each macroblock col in image
  90                 for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)
  91                 {
  92                     int seg_map_index = (mb_row * cm->mb_cols);
  93
  94                     if ((mb_col & (nsync - 1)) == 0)
  95                     {
  96                         while (mb_col > (*last_row_current_mb_col - nsync) && *last_row_current_mb_col != cm->mb_cols - 1)
  97                         {
  98                             x86_pause_hint();
  99                             thread_sleep(0);
 100                         }
 101                     }
 102
 103                     // Distance of Mb to the various image edges.
 104                     // These specified to 8th pel as they are always compared to values that are in 1/8th pel units
 105                     xd->mb_to_left_edge = -((mb_col * 16) << 3);
 106                     xd->mb_to_right_edge = ((cm->mb_cols - 1 - mb_col) * 16) << 3;
 107                     xd->mb_to_top_edge = -((mb_row * 16) << 3);
 108                     xd->mb_to_bottom_edge = ((cm->mb_rows - 1 - mb_row) * 16) << 3;
 109
 110                     // Set up limit values for motion vectors used to prevent them extending outside the UMV borders
 111                     x->mv_col_min = -((mb_col * 16) + (VP8BORDERINPIXELS - 16));
 112                     x->mv_col_max = ((cm->mb_cols - 1 - mb_col) * 16) + (VP8BORDERINPIXELS - 16);
 113                     x->mv_row_min = -((mb_row * 16) + (VP8BORDERINPIXELS - 16));
 114                     x->mv_row_max = ((cm->mb_rows - 1 - mb_row) * 16) + (VP8BORDERINPIXELS - 16);
 115
 116                     xd->dst.y_buffer = cm->yv12_fb[dst_fb_idx].y_buffer + recon_yoffset;
 117                     xd->dst.u_buffer = cm->yv12_fb[dst_fb_idx].u_buffer + recon_uvoffset;
 118                     xd->dst.v_buffer = cm->yv12_fb[dst_fb_idx].v_buffer + recon_uvoffset;
 119                     xd->left_available = (mb_col != 0);
 120
 121                     x->rddiv = cpi->RDDIV;
 122                     x->rdmult = cpi->RDMULT;
 123
 124                     if (cpi->oxcf.tuning == VP8_TUNE_SSIM)
 125                         activity_sum += vp8_activity_masking(cpi, x);
 126
 127                     // Is segmentation enabled
 128                     // MB level adjutment to quantizer
 129                     if (xd->segmentation_enabled)
 130                     {
 131                         // Code to set segment id in xd->mbmi.segment_id for current MB (with range checking)
 132                         if (cpi->segmentation_map[seg_map_index + mb_col] <= 3)
 133                             xd->mode_info_context->mbmi.segment_id = cpi->segmentation_map[seg_map_index + mb_col];
 134                         else
 135                             xd->mode_info_context->mbmi.segment_id = 0;
 136
 137                         vp8cx_mb_init_quantizer(cpi, x);
 138                     }
 139                     else
 140                         xd->mode_info_context->mbmi.segment_id = 0; // Set to Segment 0 by default
 141
 142                     x->active_ptr = cpi->active_map + seg_map_index + mb_col;
 143
 144                     if (cm->frame_type == KEY_FRAME)
 145                     {
 146                         *totalrate += vp8cx_encode_intra_macro_block(cpi, x, &tp);
 147 #ifdef MODE_STATS
 148                         y_modes[xd->mbmi.mode] ++;
 149 #endif
 150                     }
 151                     else
 152                     {
 153                         *totalrate += vp8cx_encode_inter_macroblock(cpi, x, &tp, recon_yoffset, recon_uvoffset);
 154
 155 #ifdef MODE_STATS
 156                         inter_y_modes[xd->mbmi.mode] ++;
 157
 158                         if (xd->mbmi.mode == SPLITMV)
 159                         {
 160                             int b;
 161
 162                             for (b = 0; b < xd->mbmi.partition_count; b++)
 163                             {
 164                                 inter_b_modes[x->partition->bmi[b].mode] ++;
 165                             }
 166                         }
 167
 168 #endif
 169
 170                         // Count of last ref frame 0,0 useage
 171                         if ((xd->mode_info_context->mbmi.mode == ZEROMV) && (xd->mode_info_context->mbmi.ref_frame == LAST_FRAME))
 172                             cpi->inter_zz_count++;
 173
 174                         // Special case code for cyclic refresh
 175                         // If cyclic update enabled then copy xd->mbmi.segment_id; (which may have been updated based on mode
 176                         // during vp8cx_encode_inter_macroblock()) back into the global sgmentation map
 177                         if (cpi->cyclic_refresh_mode_enabled && xd->segmentation_enabled)
 178                         {
 179                             const MB_MODE_INFO * mbmi = &xd->mode_info_context->mbmi;
 180                             cpi->segmentation_map[seg_map_index + mb_col] = mbmi->segment_id;
 181
 182                             // If the block has been refreshed mark it as clean (the magnitude of the -ve influences how long it will be before we consider another refresh):
 183                             // Else if it was coded (last frame 0,0) and has not already been refreshed then mark it as a candidate for cleanup next time (marked 0)
 184                             // else mark it as dirty (1).
 185                             if (mbmi->segment_id)
 186                                 cpi->cyclic_refresh_map[seg_map_index + mb_col] = -1;
 187                             else if ((mbmi->mode == ZEROMV) && (mbmi->ref_frame == LAST_FRAME))
 188                             {
 189                                 if (cpi->cyclic_refresh_map[seg_map_index + mb_col] == 1)
 190                                     cpi->cyclic_refresh_map[seg_map_index + mb_col] = 0;
 191                             }
 192                             else
 193                                 cpi->cyclic_refresh_map[seg_map_index + mb_col] = 1;
 194
 195                         }
 196                     }
 197                     cpi->tplist[mb_row].stop = tp;
 198
 199                     x->gf_active_ptr++; // Increment pointer into gf useage flags structure for next mb
 200
 201                     for (i = 0; i < 16; i++)
 202                         vpx_memcpy(&xd->mode_info_context->bmi[i], &xd->block[i].bmi, sizeof(xd->block[i].bmi));
 203
 204                     // adjust to the next column of macroblocks
 205                     x->src.y_buffer += 16;
 206                     x->src.u_buffer += 8;
 207                     x->src.v_buffer += 8;
 208
 209                     recon_yoffset += 16;
 210                     recon_uvoffset += 8;
 211
 212                     // Keep track of segment useage
 213                     segment_counts[xd->mode_info_context->mbmi.segment_id]++;
 214
 215                     // skip to next mb
 216                     xd->mode_info_context++;
 217                     x->partition_info++;
 218                     xd->above_context++;
 219
 220                     cpi->mt_current_mb_col[mb_row] = mb_col;
 221                 }
 222
 223                 //extend the recon for intra prediction
 224                 vp8_extend_mb_row(
 225                     &cm->yv12_fb[dst_fb_idx],
 226                     xd->dst.y_buffer + 16,
 227                     xd->dst.u_buffer + 8,
 228                     xd->dst.v_buffer + 8);
 229
 230                 // this is to account for the border
 231                 xd->mode_info_context++;
 232                 x->partition_info++;
 233                 x->activity_sum += activity_sum;
 234
 235                 x->src.y_buffer += 16 * x->src.y_stride * (cpi->encoding_thread_count + 1) - 16 * cm->mb_cols;
 236                 x->src.u_buffer += 8 * x->src.uv_stride * (cpi->encoding_thread_count + 1) - 8 * cm->mb_cols;
 237                 x->src.v_buffer += 8 * x->src.uv_stride * (cpi->encoding_thread_count + 1) - 8 * cm->mb_cols;
 238
 239                 xd->mode_info_context += xd->mode_info_stride * cpi->encoding_thread_count;
 240                 x->partition_info += xd->mode_info_stride * cpi->encoding_thread_count;
 241
 242                 if (mb_row == cm->mb_rows - 1)
 243                 {
 244                     //SetEvent(cpi->h_event_main);
 245                     sem_post(&cpi->h_event_end_encoding); /* signal frame encoding end */
 246                 }
 247             }
 248         }
 249     }
 250
 251     //printf("exit thread %d\n", ithread);
 252     return 0;
 253 }
 254
 255 static void setup_mbby_copy(MACROBLOCK *mbdst, MACROBLOCK *mbsrc)
 256 {
 257
 258     MACROBLOCK *x = mbsrc;
 259     MACROBLOCK *z = mbdst;
 260     int i;
 261
 262     z->ss               = x->ss;
 263     z->ss_count          = x->ss_count;
 264     z->searches_per_step  = x->searches_per_step;
 265     z->errorperbit      = x->errorperbit;
 266
 267     z->sadperbit16      = x->sadperbit16;
 268     z->sadperbit4       = x->sadperbit4;
 269     z->errthresh        = x->errthresh;
 270
 271     /*
 272     z->mv_col_min    = x->mv_col_min;
 273     z->mv_col_max    = x->mv_col_max;
 274     z->mv_row_min    = x->mv_row_min;
 275     z->mv_row_max    = x->mv_row_max;
 276     z->vector_range = x->vector_range ;
 277     */
 278
 279     z->vp8_short_fdct4x4     = x->vp8_short_fdct4x4;
 280     z->vp8_short_fdct8x4     = x->vp8_short_fdct8x4;
 281     z->short_walsh4x4    = x->short_walsh4x4;
 282     z->quantize_b        = x->quantize_b;
 283     z->optimize          = x->optimize;
 284
 285     /*
 286     z->mvc              = x->mvc;
 287     z->src.y_buffer      = x->src.y_buffer;
 288     z->src.u_buffer      = x->src.u_buffer;
 289     z->src.v_buffer      = x->src.v_buffer;
 290     */
 291
 292
 293     vpx_memcpy(z->mvcosts,          x->mvcosts,         sizeof(x->mvcosts));
 294     z->mvcost[0] = &z->mvcosts[0][mv_max+1];
 295     z->mvcost[1] = &z->mvcosts[1][mv_max+1];
 296     z->mvsadcost[0] = &z->mvsadcosts[0][mv_max+1];
 297     z->mvsadcost[1] = &z->mvsadcosts[1][mv_max+1];
 298
 299
 300     vpx_memcpy(z->token_costs,       x->token_costs,      sizeof(x->token_costs));
 301     vpx_memcpy(z->inter_bmode_costs,  x->inter_bmode_costs, sizeof(x->inter_bmode_costs));
 302     //memcpy(z->mvcosts,            x->mvcosts,         sizeof(x->mvcosts));
 303     //memcpy(z->mvcost,         x->mvcost,          sizeof(x->mvcost));
 304     vpx_memcpy(z->mbmode_cost,       x->mbmode_cost,      sizeof(x->mbmode_cost));
 305     vpx_memcpy(z->intra_uv_mode_cost,  x->intra_uv_mode_cost, sizeof(x->intra_uv_mode_cost));
 306     vpx_memcpy(z->bmode_costs,       x->bmode_costs,      sizeof(x->bmode_costs));
 307
 308     for (i = 0; i < 25; i++)
 309     {
 310         z->block[i].quant           = x->block[i].quant;
 311         z->block[i].quant_fast      = x->block[i].quant_fast;
 312         z->block[i].quant_shift     = x->block[i].quant_shift;
 313         z->block[i].zbin            = x->block[i].zbin;
 314         z->block[i].zrun_zbin_boost   = x->block[i].zrun_zbin_boost;
 315         z->block[i].round           = x->block[i].round;
 316         /*
 317         z->block[i].src             = x->block[i].src;
 318         */
 319         z->block[i].src_stride       = x->block[i].src_stride;
 320         z->block[i].force_empty      = x->block[i].force_empty;
 321
 322     }
 323
 324     {
 325         MACROBLOCKD *xd = &x->e_mbd;
 326         MACROBLOCKD *zd = &z->e_mbd;
 327
 328         /*
 329         zd->mode_info_context = xd->mode_info_context;
 330         zd->mode_info        = xd->mode_info;
 331
 332         zd->mode_info_stride  = xd->mode_info_stride;
 333         zd->frame_type       = xd->frame_type;
 334         zd->up_available     = xd->up_available   ;
 335         zd->left_available   = xd->left_available;
 336         zd->left_context     = xd->left_context;
 337         zd->last_frame_dc     = xd->last_frame_dc;
 338         zd->last_frame_dccons = xd->last_frame_dccons;
 339         zd->gold_frame_dc     = xd->gold_frame_dc;
 340         zd->gold_frame_dccons = xd->gold_frame_dccons;
 341         zd->mb_to_left_edge    = xd->mb_to_left_edge;
 342         zd->mb_to_right_edge   = xd->mb_to_right_edge;
 343         zd->mb_to_top_edge     = xd->mb_to_top_edge   ;
 344         zd->mb_to_bottom_edge  = xd->mb_to_bottom_edge;
 345         zd->gf_active_ptr     = xd->gf_active_ptr;
 346         zd->frames_since_golden       = xd->frames_since_golden;
 347         zd->frames_till_alt_ref_frame   = xd->frames_till_alt_ref_frame;
 348         */
 349         zd->subpixel_predict         = xd->subpixel_predict;
 350         zd->subpixel_predict8x4      = xd->subpixel_predict8x4;
 351         zd->subpixel_predict8x8      = xd->subpixel_predict8x8;
 352         zd->subpixel_predict16x16    = xd->subpixel_predict16x16;
 353         zd->segmentation_enabled     = xd->segmentation_enabled;
 354         zd->mb_segement_abs_delta      = xd->mb_segement_abs_delta;
 355         vpx_memcpy(zd->segment_feature_data, xd->segment_feature_data, sizeof(xd->segment_feature_data));
 356
 357         for (i = 0; i < 25; i++)
 358         {
 359             zd->block[i].dequant = xd->block[i].dequant;
 360         }
 361     }
 362 }
 363
 364 void vp8cx_init_mbrthread_data(VP8_COMP *cpi,
 365                                MACROBLOCK *x,
 366                                MB_ROW_COMP *mbr_ei,
 367                                int mb_row,
 368                                int count
 369                               )
 370 {
 371
 372     VP8_COMMON *const cm = & cpi->common;
 373     MACROBLOCKD *const xd = & x->e_mbd;
 374     int i;
 375     (void) mb_row;
 376
 377     for (i = 0; i < count; i++)
 378     {
 379         MACROBLOCK *mb = & mbr_ei[i].mb;
 380         MACROBLOCKD *mbd = &mb->e_mbd;
 381
 382         mbd->subpixel_predict        = xd->subpixel_predict;
 383         mbd->subpixel_predict8x4     = xd->subpixel_predict8x4;
 384         mbd->subpixel_predict8x8     = xd->subpixel_predict8x8;
 385         mbd->subpixel_predict16x16   = xd->subpixel_predict16x16;
 386 #if CONFIG_RUNTIME_CPU_DETECT
 387         mbd->rtcd                   = xd->rtcd;
 388 #endif
 389         mb->gf_active_ptr            = x->gf_active_ptr;
 390
 391         mb->vector_range             = 32;
 392
 393         vpx_memset(mbr_ei[i].segment_counts, 0, sizeof(mbr_ei[i].segment_counts));
 394         mbr_ei[i].totalrate = 0;
 395
 396         mb->partition_info = x->pi + x->e_mbd.mode_info_stride * (i + 1);
 397
 398         mbd->mode_info_context = cm->mi   + x->e_mbd.mode_info_stride * (i + 1);
 399         mbd->mode_info_stride  = cm->mode_info_stride;
 400
 401         mbd->frame_type = cm->frame_type;
 402
 403         mbd->frames_since_golden = cm->frames_since_golden;
 404         mbd->frames_till_alt_ref_frame = cm->frames_till_alt_ref_frame;
 405
 406         mb->src = * cpi->Source;
 407         mbd->pre = cm->yv12_fb[cm->lst_fb_idx];
 408         mbd->dst = cm->yv12_fb[cm->new_fb_idx];
 409
 410         mb->src.y_buffer += 16 * x->src.y_stride * (i + 1);
 411         mb->src.u_buffer +=  8 * x->src.uv_stride * (i + 1);
 412         mb->src.v_buffer +=  8 * x->src.uv_stride * (i + 1);
 413
 414         vp8_build_block_offsets(mb);
 415
 416         vp8_setup_block_dptrs(mbd);
 417
 418         vp8_setup_block_ptrs(mb);
 419
 420         mb->activity_sum = 0;
 421
 422         mbd->left_context = &cm->left_context;
 423         mb->mvc = cm->fc.mvc;
 424
 425         setup_mbby_copy(&mbr_ei[i].mb, x);
 426
 427     }
 428 }
 429
 430 void vp8cx_create_encoder_threads(VP8_COMP *cpi)
 431 {
 432     cpi->b_multi_threaded = 0;
 433
 434     cpi->processor_core_count = 32; //vp8_get_proc_core_count();
 435
 436     if (cpi->processor_core_count > 1 && cpi->oxcf.multi_threaded > 1)
 437     {
 438         int ithread;
 439
 440         if (cpi->oxcf.multi_threaded > cpi->processor_core_count)
 441             cpi->encoding_thread_count = cpi->processor_core_count - 1;
 442         else
 443             cpi->encoding_thread_count = cpi->oxcf.multi_threaded - 1;
 444
 445         CHECK_MEM_ERROR(cpi->h_encoding_thread, vpx_malloc(sizeof(pthread_t) * cpi->encoding_thread_count));
 446         CHECK_MEM_ERROR(cpi->h_event_start_encoding, vpx_malloc(sizeof(sem_t) * cpi->encoding_thread_count));
 447         CHECK_MEM_ERROR(cpi->mb_row_ei, vpx_memalign(32, sizeof(MB_ROW_COMP) * cpi->encoding_thread_count));
 448         vpx_memset(cpi->mb_row_ei, 0, sizeof(MB_ROW_COMP) * cpi->encoding_thread_count);
 449         CHECK_MEM_ERROR(cpi->en_thread_data, vpx_malloc(sizeof(ENCODETHREAD_DATA) * cpi->encoding_thread_count));
 450         CHECK_MEM_ERROR(cpi->mt_current_mb_col, vpx_malloc(sizeof(*cpi->mt_current_mb_col) * cpi->common.mb_rows));
 451
 452         //cpi->h_event_main = CreateEvent(NULL, FALSE, FALSE, NULL);
 453         sem_init(&cpi->h_event_end_encoding, 0, 0);
 454
 455         cpi->b_multi_threaded = 1;
 456
 457         //printf("[VP8:] multi_threaded encoding is enabled with %d threads\n\n", (cpi->encoding_thread_count +1));
 458
 459         for (ithread = 0; ithread < cpi->encoding_thread_count; ithread++)
 460         {
 461             ENCODETHREAD_DATA * ethd = &cpi->en_thread_data[ithread];
 462
 463             //cpi->h_event_mbrencoding[ithread] = CreateEvent(NULL, FALSE, FALSE, NULL);
 464             sem_init(&cpi->h_event_start_encoding[ithread], 0, 0);
 465             ethd->ithread = ithread;
 466             ethd->ptr1 = (void *)cpi;
 467             ethd->ptr2 = (void *)&cpi->mb_row_ei[ithread];
 468
 469             //printf(" call begin thread %d \n", ithread);
 470
 471             //cpi->h_encoding_thread[ithread] =   (HANDLE)_beginthreadex(
 472             //  NULL,           // security
 473             //  0,              // stksize
 474             //  thread_encoding_proc,
 475             //  (&cpi->en_thread_data[ithread]),          // Thread data
 476             //  0,
 477             //  NULL);
 478
 479             pthread_create(&cpi->h_encoding_thread[ithread], 0, thread_encoding_proc, ethd);
 480         }
 481
 482     }
 483
 484 }
 485
 486 void vp8cx_remove_encoder_threads(VP8_COMP *cpi)
 487 {
 488     if (cpi->b_multi_threaded)
 489     {
 490         //shutdown other threads
 491         cpi->b_multi_threaded = 0;
 492         {
 493             int i;
 494
 495             for (i = 0; i < cpi->encoding_thread_count; i++)
 496             {
 497                 //SetEvent(cpi->h_event_mbrencoding[i]);
 498                 sem_post(&cpi->h_event_start_encoding[i]);
 499                 pthread_join(cpi->h_encoding_thread[i], 0);
 500
 501                 sem_destroy(&cpi->h_event_start_encoding[i]);
 502             }
 503         }
 504
 505         sem_destroy(&cpi->h_event_end_encoding);
 506
 507         //free thread related resources
 508         vpx_free(cpi->h_event_start_encoding);
 509         vpx_free(cpi->h_encoding_thread);
 510         vpx_free(cpi->mb_row_ei);
 511         vpx_free(cpi->en_thread_data);
 512         vpx_free(cpi->mt_current_mb_col);
 513     }
 514 }
 515 #endif