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      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 extern void loopfilter_frame(VP8_COMP *cpi, VP8_COMMON *cm);
     28 
     29 static THREAD_FUNCTION loopfilter_thread(void *p_data)
     30 {
     31     VP8_COMP *cpi = (VP8_COMP *)(((LPFTHREAD_DATA *)p_data)->ptr1);
     32     VP8_COMMON *cm = &cpi->common;
     33 
     34     while (1)
     35     {
     36         if (cpi->b_multi_threaded == 0)
     37             break;
     38 
     39         if (sem_wait(&cpi->h_event_start_lpf) == 0)
     40         {
     41             if (cpi->b_multi_threaded == FALSE) // we're shutting down
     42                 break;
     43 
     44             loopfilter_frame(cpi, cm);
     45 
     46             sem_post(&cpi->h_event_end_lpf);
     47         }
     48     }
     49 
     50     return 0;
     51 }
     52 
     53 static
     54 THREAD_FUNCTION thread_encoding_proc(void *p_data)
     55 {
     56     int ithread = ((ENCODETHREAD_DATA *)p_data)->ithread;
     57     VP8_COMP *cpi = (VP8_COMP *)(((ENCODETHREAD_DATA *)p_data)->ptr1);
     58     MB_ROW_COMP *mbri = (MB_ROW_COMP *)(((ENCODETHREAD_DATA *)p_data)->ptr2);
     59     ENTROPY_CONTEXT_PLANES mb_row_left_context;
     60 
     61     const int nsync = cpi->mt_sync_range;
     62     //printf("Started thread %d\n", ithread);
     63 
     64     while (1)
     65     {
     66         if (cpi->b_multi_threaded == 0)
     67             break;
     68 
     69         //if(WaitForSingleObject(cpi->h_event_mbrencoding[ithread], INFINITE) == WAIT_OBJECT_0)
     70         if (sem_wait(&cpi->h_event_start_encoding[ithread]) == 0)
     71         {
     72             VP8_COMMON *cm = &cpi->common;
     73             int mb_row;
     74             MACROBLOCK *x = &mbri->mb;
     75             MACROBLOCKD *xd = &x->e_mbd;
     76             TOKENEXTRA *tp ;
     77 
     78             int *segment_counts = mbri->segment_counts;
     79             int *totalrate = &mbri->totalrate;
     80 
     81             if (cpi->b_multi_threaded == FALSE) // we're shutting down
     82                 break;
     83 
     84             for (mb_row = ithread + 1; mb_row < cm->mb_rows; mb_row += (cpi->encoding_thread_count + 1))
     85             {
     86 
     87                 int i;
     88                 int recon_yoffset, recon_uvoffset;
     89                 int mb_col;
     90                 int ref_fb_idx = cm->lst_fb_idx;
     91                 int dst_fb_idx = cm->new_fb_idx;
     92                 int recon_y_stride = cm->yv12_fb[ref_fb_idx].y_stride;
     93                 int recon_uv_stride = cm->yv12_fb[ref_fb_idx].uv_stride;
     94                 volatile int *last_row_current_mb_col;
     95                 INT64 activity_sum = 0;
     96 
     97                 tp = cpi->tok + (mb_row * (cm->mb_cols * 16 * 24));
     98 
     99                 last_row_current_mb_col = &cpi->mt_current_mb_col[mb_row - 1];
    100 
    101                 // reset above block coeffs
    102                 xd->above_context = cm->above_context;
    103                 xd->left_context = &mb_row_left_context;
    104 
    105                 vp8_zero(mb_row_left_context);
    106 
    107                 xd->up_available = (mb_row != 0);
    108                 recon_yoffset = (mb_row * recon_y_stride * 16);
    109                 recon_uvoffset = (mb_row * recon_uv_stride * 8);
    110 
    111                 cpi->tplist[mb_row].start = tp;
    112 
    113                 //printf("Thread mb_row = %d\n", mb_row);
    114 
    115                 // for each macroblock col in image
    116                 for (mb_col = 0; mb_col < cm->mb_cols; mb_col++)
    117                 {
    118                     int seg_map_index = (mb_row * cm->mb_cols);
    119 
    120                     if ((mb_col & (nsync - 1)) == 0)
    121                     {
    122                         while (mb_col > (*last_row_current_mb_col - nsync) && *last_row_current_mb_col != cm->mb_cols - 1)
    123                         {
    124                             x86_pause_hint();
    125                             thread_sleep(0);
    126                         }
    127                     }
    128 
    129                     // Distance of Mb to the various image edges.
    130                     // These specified to 8th pel as they are always compared to values that are in 1/8th pel units
    131                     xd->mb_to_left_edge = -((mb_col * 16) << 3);
    132                     xd->mb_to_right_edge = ((cm->mb_cols - 1 - mb_col) * 16) << 3;
    133                     xd->mb_to_top_edge = -((mb_row * 16) << 3);
    134                     xd->mb_to_bottom_edge = ((cm->mb_rows - 1 - mb_row) * 16) << 3;
    135 
    136                     // Set up limit values for motion vectors used to prevent them extending outside the UMV borders
    137                     x->mv_col_min = -((mb_col * 16) + (VP8BORDERINPIXELS - 16));
    138                     x->mv_col_max = ((cm->mb_cols - 1 - mb_col) * 16) + (VP8BORDERINPIXELS - 16);
    139                     x->mv_row_min = -((mb_row * 16) + (VP8BORDERINPIXELS - 16));
    140                     x->mv_row_max = ((cm->mb_rows - 1 - mb_row) * 16) + (VP8BORDERINPIXELS - 16);
    141 
    142                     xd->dst.y_buffer = cm->yv12_fb[dst_fb_idx].y_buffer + recon_yoffset;
    143                     xd->dst.u_buffer = cm->yv12_fb[dst_fb_idx].u_buffer + recon_uvoffset;
    144                     xd->dst.v_buffer = cm->yv12_fb[dst_fb_idx].v_buffer + recon_uvoffset;
    145                     xd->left_available = (mb_col != 0);
    146 
    147                     x->rddiv = cpi->RDDIV;
    148                     x->rdmult = cpi->RDMULT;
    149 
    150                     if (cpi->oxcf.tuning == VP8_TUNE_SSIM)
    151                         activity_sum += vp8_activity_masking(cpi, x);
    152 
    153                     // Is segmentation enabled
    154                     // MB level adjutment to quantizer
    155                     if (xd->segmentation_enabled)
    156                     {
    157                         // Code to set segment id in xd->mbmi.segment_id for current MB (with range checking)
    158                         if (cpi->segmentation_map[seg_map_index + mb_col] <= 3)
    159                             xd->mode_info_context->mbmi.segment_id = cpi->segmentation_map[seg_map_index + mb_col];
    160                         else
    161                             xd->mode_info_context->mbmi.segment_id = 0;
    162 
    163                         vp8cx_mb_init_quantizer(cpi, x);
    164                     }
    165                     else
    166                         xd->mode_info_context->mbmi.segment_id = 0; // Set to Segment 0 by default
    167 
    168                     x->active_ptr = cpi->active_map + seg_map_index + mb_col;
    169 
    170                     if (cm->frame_type == KEY_FRAME)
    171                     {
    172                         *totalrate += vp8cx_encode_intra_macro_block(cpi, x, &tp);
    173 #ifdef MODE_STATS
    174                         y_modes[xd->mbmi.mode] ++;
    175 #endif
    176                     }
    177                     else
    178                     {
    179                         *totalrate += vp8cx_encode_inter_macroblock(cpi, x, &tp, recon_yoffset, recon_uvoffset);
    180 
    181 #ifdef MODE_STATS
    182                         inter_y_modes[xd->mbmi.mode] ++;
    183 
    184                         if (xd->mbmi.mode == SPLITMV)
    185                         {
    186                             int b;
    187 
    188                             for (b = 0; b < xd->mbmi.partition_count; b++)
    189                             {
    190                                 inter_b_modes[x->partition->bmi[b].mode] ++;
    191                             }
    192                         }
    193 
    194 #endif
    195 
    196                         // Count of last ref frame 0,0 useage
    197                         if ((xd->mode_info_context->mbmi.mode == ZEROMV) && (xd->mode_info_context->mbmi.ref_frame == LAST_FRAME))
    198                             cpi->inter_zz_count++;
    199 
    200                         // Special case code for cyclic refresh
    201                         // If cyclic update enabled then copy xd->mbmi.segment_id; (which may have been updated based on mode
    202                         // during vp8cx_encode_inter_macroblock()) back into the global sgmentation map
    203                         if (cpi->cyclic_refresh_mode_enabled && xd->segmentation_enabled)
    204                         {
    205                             const MB_MODE_INFO * mbmi = &xd->mode_info_context->mbmi;
    206                             cpi->segmentation_map[seg_map_index + mb_col] = mbmi->segment_id;
    207 
    208                             // 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):
    209                             // 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)
    210                             // else mark it as dirty (1).
    211                             if (mbmi->segment_id)
    212                                 cpi->cyclic_refresh_map[seg_map_index + mb_col] = -1;
    213                             else if ((mbmi->mode == ZEROMV) && (mbmi->ref_frame == LAST_FRAME))
    214                             {
    215                                 if (cpi->cyclic_refresh_map[seg_map_index + mb_col] == 1)
    216                                     cpi->cyclic_refresh_map[seg_map_index + mb_col] = 0;
    217                             }
    218                             else
    219                                 cpi->cyclic_refresh_map[seg_map_index + mb_col] = 1;
    220 
    221                         }
    222                     }
    223                     cpi->tplist[mb_row].stop = tp;
    224 
    225                     x->gf_active_ptr++; // Increment pointer into gf useage flags structure for next mb
    226 
    227                     for (i = 0; i < 16; i++)
    228                         vpx_memcpy(&xd->mode_info_context->bmi[i], &xd->block[i].bmi, sizeof(xd->block[i].bmi));
    229 
    230                     // adjust to the next column of macroblocks
    231                     x->src.y_buffer += 16;
    232                     x->src.u_buffer += 8;
    233                     x->src.v_buffer += 8;
    234 
    235                     recon_yoffset += 16;
    236                     recon_uvoffset += 8;
    237 
    238                     // Keep track of segment useage
    239                     segment_counts[xd->mode_info_context->mbmi.segment_id]++;
    240 
    241                     // skip to next mb
    242                     xd->mode_info_context++;
    243                     x->partition_info++;
    244                     xd->above_context++;
    245 
    246                     cpi->mt_current_mb_col[mb_row] = mb_col;
    247                 }
    248 
    249                 //extend the recon for intra prediction
    250                 vp8_extend_mb_row(
    251                     &cm->yv12_fb[dst_fb_idx],
    252                     xd->dst.y_buffer + 16,
    253                     xd->dst.u_buffer + 8,
    254                     xd->dst.v_buffer + 8);
    255 
    256                 // this is to account for the border
    257                 xd->mode_info_context++;
    258                 x->partition_info++;
    259                 x->activity_sum += activity_sum;
    260 
    261                 x->src.y_buffer += 16 * x->src.y_stride * (cpi->encoding_thread_count + 1) - 16 * cm->mb_cols;
    262                 x->src.u_buffer += 8 * x->src.uv_stride * (cpi->encoding_thread_count + 1) - 8 * cm->mb_cols;
    263                 x->src.v_buffer += 8 * x->src.uv_stride * (cpi->encoding_thread_count + 1) - 8 * cm->mb_cols;
    264 
    265                 xd->mode_info_context += xd->mode_info_stride * cpi->encoding_thread_count;
    266                 x->partition_info += xd->mode_info_stride * cpi->encoding_thread_count;
    267 
    268                 if (mb_row == cm->mb_rows - 1)
    269                 {
    270                     //SetEvent(cpi->h_event_main);
    271                     sem_post(&cpi->h_event_end_encoding); /* signal frame encoding end */
    272                 }
    273             }
    274         }
    275     }
    276 
    277     //printf("exit thread %d\n", ithread);
    278     return 0;
    279 }
    280 
    281 static void setup_mbby_copy(MACROBLOCK *mbdst, MACROBLOCK *mbsrc)
    282 {
    283 
    284     MACROBLOCK *x = mbsrc;
    285     MACROBLOCK *z = mbdst;
    286     int i;
    287 
    288     z->ss               = x->ss;
    289     z->ss_count          = x->ss_count;
    290     z->searches_per_step  = x->searches_per_step;
    291     z->errorperbit      = x->errorperbit;
    292 
    293     z->sadperbit16      = x->sadperbit16;
    294     z->sadperbit4       = x->sadperbit4;
    295     z->errthresh        = x->errthresh;
    296 
    297     /*
    298     z->mv_col_min    = x->mv_col_min;
    299     z->mv_col_max    = x->mv_col_max;
    300     z->mv_row_min    = x->mv_row_min;
    301     z->mv_row_max    = x->mv_row_max;
    302     z->vector_range = x->vector_range ;
    303     */
    304 
    305     z->vp8_short_fdct4x4     = x->vp8_short_fdct4x4;
    306     z->vp8_short_fdct8x4     = x->vp8_short_fdct8x4;
    307     z->short_walsh4x4    = x->short_walsh4x4;
    308     z->quantize_b        = x->quantize_b;
    309     z->optimize          = x->optimize;
    310 
    311     /*
    312     z->mvc              = x->mvc;
    313     z->src.y_buffer      = x->src.y_buffer;
    314     z->src.u_buffer      = x->src.u_buffer;
    315     z->src.v_buffer      = x->src.v_buffer;
    316     */
    317 
    318 
    319     vpx_memcpy(z->mvcosts,          x->mvcosts,         sizeof(x->mvcosts));
    320     z->mvcost[0] = &z->mvcosts[0][mv_max+1];
    321     z->mvcost[1] = &z->mvcosts[1][mv_max+1];
    322     z->mvsadcost[0] = &z->mvsadcosts[0][mv_max+1];
    323     z->mvsadcost[1] = &z->mvsadcosts[1][mv_max+1];
    324 
    325 
    326     vpx_memcpy(z->token_costs,       x->token_costs,      sizeof(x->token_costs));
    327     vpx_memcpy(z->inter_bmode_costs,  x->inter_bmode_costs, sizeof(x->inter_bmode_costs));
    328     //memcpy(z->mvcosts,            x->mvcosts,         sizeof(x->mvcosts));
    329     //memcpy(z->mvcost,         x->mvcost,          sizeof(x->mvcost));
    330     vpx_memcpy(z->mbmode_cost,       x->mbmode_cost,      sizeof(x->mbmode_cost));
    331     vpx_memcpy(z->intra_uv_mode_cost,  x->intra_uv_mode_cost, sizeof(x->intra_uv_mode_cost));
    332     vpx_memcpy(z->bmode_costs,       x->bmode_costs,      sizeof(x->bmode_costs));
    333 
    334     for (i = 0; i < 25; i++)
    335     {
    336         z->block[i].quant           = x->block[i].quant;
    337         z->block[i].quant_fast      = x->block[i].quant_fast;
    338         z->block[i].quant_shift     = x->block[i].quant_shift;
    339         z->block[i].zbin            = x->block[i].zbin;
    340         z->block[i].zrun_zbin_boost   = x->block[i].zrun_zbin_boost;
    341         z->block[i].round           = x->block[i].round;
    342         /*
    343         z->block[i].src             = x->block[i].src;
    344         */
    345         z->block[i].src_stride       = x->block[i].src_stride;
    346         z->block[i].force_empty      = x->block[i].force_empty;
    347 
    348     }
    349 
    350     {
    351         MACROBLOCKD *xd = &x->e_mbd;
    352         MACROBLOCKD *zd = &z->e_mbd;
    353 
    354         /*
    355         zd->mode_info_context = xd->mode_info_context;
    356         zd->mode_info        = xd->mode_info;
    357 
    358         zd->mode_info_stride  = xd->mode_info_stride;
    359         zd->frame_type       = xd->frame_type;
    360         zd->up_available     = xd->up_available   ;
    361         zd->left_available   = xd->left_available;
    362         zd->left_context     = xd->left_context;
    363         zd->last_frame_dc     = xd->last_frame_dc;
    364         zd->last_frame_dccons = xd->last_frame_dccons;
    365         zd->gold_frame_dc     = xd->gold_frame_dc;
    366         zd->gold_frame_dccons = xd->gold_frame_dccons;
    367         zd->mb_to_left_edge    = xd->mb_to_left_edge;
    368         zd->mb_to_right_edge   = xd->mb_to_right_edge;
    369         zd->mb_to_top_edge     = xd->mb_to_top_edge   ;
    370         zd->mb_to_bottom_edge  = xd->mb_to_bottom_edge;
    371         zd->gf_active_ptr     = xd->gf_active_ptr;
    372         zd->frames_since_golden       = xd->frames_since_golden;
    373         zd->frames_till_alt_ref_frame   = xd->frames_till_alt_ref_frame;
    374         */
    375         zd->subpixel_predict         = xd->subpixel_predict;
    376         zd->subpixel_predict8x4      = xd->subpixel_predict8x4;
    377         zd->subpixel_predict8x8      = xd->subpixel_predict8x8;
    378         zd->subpixel_predict16x16    = xd->subpixel_predict16x16;
    379         zd->segmentation_enabled     = xd->segmentation_enabled;
    380         zd->mb_segement_abs_delta      = xd->mb_segement_abs_delta;
    381         vpx_memcpy(zd->segment_feature_data, xd->segment_feature_data, sizeof(xd->segment_feature_data));
    382 
    383         for (i = 0; i < 25; i++)
    384         {
    385             zd->block[i].dequant = xd->block[i].dequant;
    386         }
    387     }
    388 }
    389 
    390 void vp8cx_init_mbrthread_data(VP8_COMP *cpi,
    391                                MACROBLOCK *x,
    392                                MB_ROW_COMP *mbr_ei,
    393                                int mb_row,
    394                                int count
    395                               )
    396 {
    397 
    398     VP8_COMMON *const cm = & cpi->common;
    399     MACROBLOCKD *const xd = & x->e_mbd;
    400     int i;
    401     (void) mb_row;
    402 
    403     for (i = 0; i < count; i++)
    404     {
    405         MACROBLOCK *mb = & mbr_ei[i].mb;
    406         MACROBLOCKD *mbd = &mb->e_mbd;
    407 
    408         mbd->subpixel_predict        = xd->subpixel_predict;
    409         mbd->subpixel_predict8x4     = xd->subpixel_predict8x4;
    410         mbd->subpixel_predict8x8     = xd->subpixel_predict8x8;
    411         mbd->subpixel_predict16x16   = xd->subpixel_predict16x16;
    412 #if CONFIG_RUNTIME_CPU_DETECT
    413         mbd->rtcd                   = xd->rtcd;
    414 #endif
    415         mb->gf_active_ptr            = x->gf_active_ptr;
    416 
    417         mb->vector_range             = 32;
    418 
    419         vpx_memset(mbr_ei[i].segment_counts, 0, sizeof(mbr_ei[i].segment_counts));
    420         mbr_ei[i].totalrate = 0;
    421 
    422         mb->partition_info = x->pi + x->e_mbd.mode_info_stride * (i + 1);
    423 
    424         mbd->mode_info_context = cm->mi   + x->e_mbd.mode_info_stride * (i + 1);
    425         mbd->mode_info_stride  = cm->mode_info_stride;
    426 
    427         mbd->frame_type = cm->frame_type;
    428 
    429         mbd->frames_since_golden = cm->frames_since_golden;
    430         mbd->frames_till_alt_ref_frame = cm->frames_till_alt_ref_frame;
    431 
    432         mb->src = * cpi->Source;
    433         mbd->pre = cm->yv12_fb[cm->lst_fb_idx];
    434         mbd->dst = cm->yv12_fb[cm->new_fb_idx];
    435 
    436         mb->src.y_buffer += 16 * x->src.y_stride * (i + 1);
    437         mb->src.u_buffer +=  8 * x->src.uv_stride * (i + 1);
    438         mb->src.v_buffer +=  8 * x->src.uv_stride * (i + 1);
    439 
    440         vp8_build_block_offsets(mb);
    441 
    442         vp8_setup_block_dptrs(mbd);
    443 
    444         vp8_setup_block_ptrs(mb);
    445 
    446         mb->activity_sum = 0;
    447 
    448         mbd->left_context = &cm->left_context;
    449         mb->mvc = cm->fc.mvc;
    450 
    451         setup_mbby_copy(&mbr_ei[i].mb, x);
    452 
    453     }
    454 }
    455 
    456 void vp8cx_create_encoder_threads(VP8_COMP *cpi)
    457 {
    458     const VP8_COMMON * cm = &cpi->common;
    459 
    460     cpi->b_multi_threaded = 0;
    461     cpi->encoding_thread_count = 0;
    462     cpi->processor_core_count = 32; //vp8_get_proc_core_count();
    463 
    464     if (cpi->processor_core_count > 1 && cpi->oxcf.multi_threaded > 1)
    465     {
    466         int ithread;
    467         int th_count = cpi->oxcf.multi_threaded - 1;
    468 
    469         if (cpi->oxcf.multi_threaded > cpi->processor_core_count)
    470             th_count = cpi->processor_core_count - 1;
    471 
    472         /* we have th_count + 1 (main) threads processing one row each */
    473         /* no point to have more threads than the sync range allows */
    474         if(th_count > ((cm->mb_cols / cpi->mt_sync_range) - 1))
    475         {
    476             th_count = (cm->mb_cols / cpi->mt_sync_range) - 1;
    477         }
    478 
    479         if(th_count == 0)
    480             return;
    481 
    482         CHECK_MEM_ERROR(cpi->h_encoding_thread, vpx_malloc(sizeof(pthread_t) * th_count));
    483         CHECK_MEM_ERROR(cpi->h_event_start_encoding, vpx_malloc(sizeof(sem_t) * th_count));
    484         CHECK_MEM_ERROR(cpi->mb_row_ei, vpx_memalign(32, sizeof(MB_ROW_COMP) * th_count));
    485         vpx_memset(cpi->mb_row_ei, 0, sizeof(MB_ROW_COMP) * th_count);
    486         CHECK_MEM_ERROR(cpi->en_thread_data,
    487                         vpx_malloc(sizeof(ENCODETHREAD_DATA) * th_count));
    488         CHECK_MEM_ERROR(cpi->mt_current_mb_col,
    489                         vpx_malloc(sizeof(*cpi->mt_current_mb_col) * cm->mb_rows));
    490 
    491         sem_init(&cpi->h_event_end_encoding, 0, 0);
    492 
    493         cpi->b_multi_threaded = 1;
    494         cpi->encoding_thread_count = th_count;
    495 
    496         /*
    497         printf("[VP8:] multi_threaded encoding is enabled with %d threads\n\n",
    498                (cpi->encoding_thread_count +1));
    499         */
    500 
    501         for (ithread = 0; ithread < th_count; ithread++)
    502         {
    503             ENCODETHREAD_DATA * ethd = &cpi->en_thread_data[ithread];
    504 
    505             sem_init(&cpi->h_event_start_encoding[ithread], 0, 0);
    506             ethd->ithread = ithread;
    507             ethd->ptr1 = (void *)cpi;
    508             ethd->ptr2 = (void *)&cpi->mb_row_ei[ithread];
    509 
    510             pthread_create(&cpi->h_encoding_thread[ithread], 0, thread_encoding_proc, ethd);
    511         }
    512 
    513         {
    514             LPFTHREAD_DATA * lpfthd = &cpi->lpf_thread_data;
    515 
    516             sem_init(&cpi->h_event_start_lpf, 0, 0);
    517             sem_init(&cpi->h_event_end_lpf, 0, 0);
    518 
    519             lpfthd->ptr1 = (void *)cpi;
    520             pthread_create(&cpi->h_filter_thread, 0, loopfilter_thread, lpfthd);
    521         }
    522     }
    523 
    524 }
    525 
    526 void vp8cx_remove_encoder_threads(VP8_COMP *cpi)
    527 {
    528     if (cpi->b_multi_threaded)
    529     {
    530         //shutdown other threads
    531         cpi->b_multi_threaded = 0;
    532         {
    533             int i;
    534 
    535             for (i = 0; i < cpi->encoding_thread_count; i++)
    536             {
    537                 //SetEvent(cpi->h_event_mbrencoding[i]);
    538                 sem_post(&cpi->h_event_start_encoding[i]);
    539                 pthread_join(cpi->h_encoding_thread[i], 0);
    540 
    541                 sem_destroy(&cpi->h_event_start_encoding[i]);
    542             }
    543 
    544             sem_post(&cpi->h_event_start_lpf);
    545             pthread_join(cpi->h_filter_thread, 0);
    546         }
    547 
    548         sem_destroy(&cpi->h_event_end_encoding);
    549         sem_destroy(&cpi->h_event_end_lpf);
    550         sem_destroy(&cpi->h_event_start_lpf);
    551 
    552         //free thread related resources
    553         vpx_free(cpi->h_event_start_encoding);
    554         vpx_free(cpi->h_encoding_thread);
    555         vpx_free(cpi->mb_row_ei);
    556         vpx_free(cpi->en_thread_data);
    557         vpx_free(cpi->mt_current_mb_col);
    558     }
    559 }
    560 #endif
    561