text: /*
   *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #include "vpx_config.h"
  #include "vp8_rtcd.h"
  #if !defined(WIN32) && CONFIG_OS_SUPPORT == 1
  #include <unistd.h>
  #endif
  #include "onyxd_int.h"
  #include "vpx_mem/vpx_mem.h"
  #include "vp8/common/threading.h"
  
  #include "vp8/common/loopfilter.h"
  #include "vp8/common/extend.h"
  #include "vpx_ports/vpx_timer.h"
  #include "detokenize.h"
  #include "vp8/common/reconintra4x4.h"
  #include "vp8/common/reconinter.h"
  #include "vp8/common/reconintra.h"
  #include "vp8/common/setupintrarecon.h"
  #if CONFIG_ERROR_CONCEALMENT
  #include "error_concealment.h"
  #endif
  
  #define CALLOC_ARRAY(p, n) CHECK_MEM_ERROR((p), vpx_calloc(sizeof(*(p)), (n)))
  #define CALLOC_ARRAY_ALIGNED(p, n, algn)                            \
    do {                                                              \
      CHECK_MEM_ERROR((p), vpx_memalign((algn), sizeof(*(p)) * (n))); \
      memset((p), 0, (n) * sizeof(*(p)));                             \
    } while (0)
  
  void vp8_mb_init_dequantizer(VP8D_COMP *pbi, MACROBLOCKD *xd);
  
  static void setup_decoding_thread_data(VP8D_COMP *pbi, MACROBLOCKD *xd,
                                         MB_ROW_DEC *mbrd, int count) {
    VP8_COMMON *const pc = &pbi->common;
    int i;
  
    for (i = 0; i < count; ++i) {
      MACROBLOCKD *mbd = &mbrd[i].mbd;
      mbd->subpixel_predict = xd->subpixel_predict;
      mbd->subpixel_predict8x4 = xd->subpixel_predict8x4;
      mbd->subpixel_predict8x8 = xd->subpixel_predict8x8;
      mbd->subpixel_predict16x16 = xd->subpixel_predict16x16;
  
      mbd->mode_info_context = pc->mi + pc->mode_info_stride * (i + 1);
      mbd->mode_info_stride = pc->mode_info_stride;
  
      mbd->frame_type = pc->frame_type;
      mbd->pre = xd->pre;
      mbd->dst = xd->dst;
  
      mbd->segmentation_enabled = xd->segmentation_enabled;
      mbd->mb_segement_abs_delta = xd->mb_segement_abs_delta;
      memcpy(mbd->segment_feature_data, xd->segment_feature_data,
             sizeof(xd->segment_feature_data));
  
      /*signed char ref_lf_deltas[MAX_REF_LF_DELTAS];*/
      memcpy(mbd->ref_lf_deltas, xd->ref_lf_deltas, sizeof(xd->ref_lf_deltas));
      /*signed char mode_lf_deltas[MAX_MODE_LF_DELTAS];*/
      memcpy(mbd->mode_lf_deltas, xd->mode_lf_deltas, sizeof(xd->mode_lf_deltas));
      /*unsigned char mode_ref_lf_delta_enabled;
      unsigned char mode_ref_lf_delta_update;*/
      mbd->mode_ref_lf_delta_enabled = xd->mode_ref_lf_delta_enabled;
      mbd->mode_ref_lf_delta_update = xd->mode_ref_lf_delta_update;
  
      mbd->current_bc = &pbi->mbc[0];
  
      memcpy(mbd->dequant_y1_dc, xd->dequant_y1_dc, sizeof(xd->dequant_y1_dc));
      memcpy(mbd->dequant_y1, xd->dequant_y1, sizeof(xd->dequant_y1));
      memcpy(mbd->dequant_y2, xd->dequant_y2, sizeof(xd->dequant_y2));
      memcpy(mbd->dequant_uv, xd->dequant_uv, sizeof(xd->dequant_uv));
  
      mbd->fullpixel_mask = 0xffffffff;
  
      if (pc->full_pixel) mbd->fullpixel_mask = 0xfffffff8;
    }
  
    for (i = 0; i < pc->mb_rows; ++i) pbi->mt_current_mb_col[i] = -1;
  }
  
  static void mt_decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
                                   unsigned int mb_idx) {
    MB_PREDICTION_MODE mode;
    int i;
  #if CONFIG_ERROR_CONCEALMENT
    int corruption_detected = 0;
  #else
    (void)mb_idx;
  #endif
  
    if (xd->mode_info_context->mbmi.mb_skip_coeff) {
      vp8_reset_mb_tokens_context(xd);
    } else if (!vp8dx_bool_error(xd->current_bc)) {
      int eobtotal;
      eobtotal = vp8_decode_mb_tokens(pbi, xd);
  
      /* Special case:  Force the loopfilter to skip when eobtotal is zero */
      xd->mode_info_context->mbmi.mb_skip_coeff = (eobtotal == 0);
    }
  
    mode = xd->mode_info_context->mbmi.mode;
  
    if (xd->segmentation_enabled) vp8_mb_init_dequantizer(pbi, xd);
  
  #if CONFIG_ERROR_CONCEALMENT
  
    if (pbi->ec_active) {
      int throw_residual;
      /* When we have independent partitions we can apply residual even
       * though other partitions within the frame are corrupt.
       */
      throw_residual =
          (!pbi->independent_partitions && pbi->frame_corrupt_residual);
      throw_residual = (throw_residual || vp8dx_bool_error(xd->current_bc));
  
      if ((mb_idx >= pbi->mvs_corrupt_from_mb || throw_residual)) {
        /* MB with corrupt residuals or corrupt mode/motion vectors.
         * Better to use the predictor as reconstruction.
         */
        pbi->frame_corrupt_residual = 1;
        memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
  
        corruption_detected = 1;
  
        /* force idct to be skipped for B_PRED and use the
         * prediction only for reconstruction
         * */
        memset(xd->eobs, 0, 25);
      }
    }
  #endif
  
    /* do prediction */
    if (xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME) {
      vp8_build_intra_predictors_mbuv_s(
          xd, xd->recon_above[1], xd->recon_above[2], xd->recon_left[1],
          xd->recon_left[2], xd->recon_left_stride[1], xd->dst.u_buffer,
          xd->dst.v_buffer, xd->dst.uv_stride);
  
      if (mode != B_PRED) {
        vp8_build_intra_predictors_mby_s(
            xd, xd->recon_above[0], xd->recon_left[0], xd->recon_left_stride[0],
            xd->dst.y_buffer, xd->dst.y_stride);
      } else {
        short *DQC = xd->dequant_y1;
        int dst_stride = xd->dst.y_stride;
  
        /* clear out residual eob info */
        if (xd->mode_info_context->mbmi.mb_skip_coeff) memset(xd->eobs, 0, 25);
  
        intra_prediction_down_copy(xd, xd->recon_above[0] + 16);
  
        for (i = 0; i < 16; ++i) {
          BLOCKD *b = &xd->block[i];
          unsigned char *dst = xd->dst.y_buffer + b->offset;
          B_PREDICTION_MODE b_mode = xd->mode_info_context->bmi[i].as_mode;
          unsigned char *Above;
          unsigned char *yleft;
          int left_stride;
          unsigned char top_left;
  
          /*Caution: For some b_mode, it needs 8 pixels (4 above + 4
           * above-right).*/
          if (i < 4 && pbi->common.filter_level) {
            Above = xd->recon_above[0] + b->offset;
          } else {
            Above = dst - dst_stride;
          }
  
          if (i % 4 == 0 && pbi->common.filter_level) {
            yleft = xd->recon_left[0] + i;
            left_stride = 1;
          } else {
            yleft = dst - 1;
            left_stride = dst_stride;
          }
  
          if ((i == 4 || i == 8 || i == 12) && pbi->common.filter_level) {
            top_left = *(xd->recon_left[0] + i - 1);
          } else {
            top_left = Above[-1];
          }
  
          vp8_intra4x4_predict(Above, yleft, left_stride, b_mode, dst, dst_stride,
                               top_left);
  
          if (xd->eobs[i]) {
            if (xd->eobs[i] > 1) {
              vp8_dequant_idct_add(b->qcoeff, DQC, dst, dst_stride);
            } else {
              vp8_dc_only_idct_add(b->qcoeff[0] * DQC[0], dst, dst_stride, dst,
                                   dst_stride);
              memset(b->qcoeff, 0, 2 * sizeof(b->qcoeff[0]));
            }
          }
        }
      }
    } else {
      vp8_build_inter_predictors_mb(xd);
    }
  
  #if CONFIG_ERROR_CONCEALMENT
    if (corruption_detected) {
      return;
    }
  #endif
  
    if (!xd->mode_info_context->mbmi.mb_skip_coeff) {
      /* dequantization and idct */
      if (mode != B_PRED) {
        short *DQC = xd->dequant_y1;
  
        if (mode != SPLITMV) {
          BLOCKD *b = &xd->block[24];
  
          /* do 2nd order transform on the dc block */
          if (xd->eobs[24] > 1) {
            vp8_dequantize_b(b, xd->dequant_y2);
  
            vp8_short_inv_walsh4x4(&b->dqcoeff[0], xd->qcoeff);
            memset(b->qcoeff, 0, 16 * sizeof(b->qcoeff[0]));
          } else {
            b->dqcoeff[0] = b->qcoeff[0] * xd->dequant_y2[0];
            vp8_short_inv_walsh4x4_1(&b->dqcoeff[0], xd->qcoeff);
            memset(b->qcoeff, 0, 2 * sizeof(b->qcoeff[0]));
          }
  
          /* override the dc dequant constant in order to preserve the
           * dc components
           */
          DQC = xd->dequant_y1_dc;
        }
  
        vp8_dequant_idct_add_y_block(xd->qcoeff, DQC, xd->dst.y_buffer,
                                     xd->dst.y_stride, xd->eobs);
      }
  
      vp8_dequant_idct_add_uv_block(xd->qcoeff + 16 * 16, xd->dequant_uv,
                                    xd->dst.u_buffer, xd->dst.v_buffer,
                                    xd->dst.uv_stride, xd->eobs + 16);
    }
  }
  
  static void mt_decode_mb_rows(VP8D_COMP *pbi, MACROBLOCKD *xd,
                                int start_mb_row) {
    volatile const int *last_row_current_mb_col;
    volatile int *current_mb_col;
    int mb_row;
    VP8_COMMON *pc = &pbi->common;
    const int nsync = pbi->sync_range;
    const int first_row_no_sync_above = pc->mb_cols + nsync;
    int num_part = 1 << pbi->common.multi_token_partition;
    int last_mb_row = start_mb_row;
  
    YV12_BUFFER_CONFIG *yv12_fb_new = pbi->dec_fb_ref[INTRA_FRAME];
    YV12_BUFFER_CONFIG *yv12_fb_lst = pbi->dec_fb_ref[LAST_FRAME];
  
    int recon_y_stride = yv12_fb_new->y_stride;
    int recon_uv_stride = yv12_fb_new->uv_stride;
  
    unsigned char *ref_buffer[MAX_REF_FRAMES][3];
    unsigned char *dst_buffer[3];
    int i;
    int ref_fb_corrupted[MAX_REF_FRAMES];
  
    ref_fb_corrupted[INTRA_FRAME] = 0;
  
    for (i = 1; i < MAX_REF_FRAMES; ++i) {
      YV12_BUFFER_CONFIG *this_fb = pbi->dec_fb_ref[i];
  
      ref_buffer[i][0] = this_fb->y_buffer;
      ref_buffer[i][1] = this_fb->u_buffer;
      ref_buffer[i][2] = this_fb->v_buffer;
  
      ref_fb_corrupted[i] = this_fb->corrupted;
    }
  
    dst_buffer[0] = yv12_fb_new->y_buffer;
    dst_buffer[1] = yv12_fb_new->u_buffer;
    dst_buffer[2] = yv12_fb_new->v_buffer;
  
    xd->up_available = (start_mb_row != 0);
  
    for (mb_row = start_mb_row; mb_row < pc->mb_rows;
         mb_row += (pbi->decoding_thread_count + 1)) {
      int recon_yoffset, recon_uvoffset;
      int mb_col;
      int filter_level;
      loop_filter_info_n *lfi_n = &pc->lf_info;
  
      /* save last row processed by this thread */
      last_mb_row = mb_row;
      /* select bool coder for current partition */
      xd->current_bc = &pbi->mbc[mb_row % num_part];
  
      if (mb_row > 0) {
        last_row_current_mb_col = &pbi->mt_current_mb_col[mb_row - 1];
      } else {
        last_row_current_mb_col = &first_row_no_sync_above;
      }
  
      current_mb_col = &pbi->mt_current_mb_col[mb_row];
  
      recon_yoffset = mb_row * recon_y_stride * 16;
      recon_uvoffset = mb_row * recon_uv_stride * 8;
  
      /* reset contexts */
      xd->above_context = pc->above_context;
      memset(xd->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
  
      xd->left_available = 0;
  
      xd->mb_to_top_edge = -((mb_row * 16)) << 3;
      xd->mb_to_bottom_edge = ((pc->mb_rows - 1 - mb_row) * 16) << 3;
  
      if (pbi->common.filter_level) {
        xd->recon_above[0] = pbi->mt_yabove_row[mb_row] + 0 * 16 + 32;
        xd->recon_above[1] = pbi->mt_uabove_row[mb_row] + 0 * 8 + 16;
        xd->recon_above[2] = pbi->mt_vabove_row[mb_row] + 0 * 8 + 16;
  
        xd->recon_left[0] = pbi->mt_yleft_col[mb_row];
        xd->recon_left[1] = pbi->mt_uleft_col[mb_row];
        xd->recon_left[2] = pbi->mt_vleft_col[mb_row];
  
        /* TODO: move to outside row loop */
        xd->recon_left_stride[0] = 1;
        xd->recon_left_stride[1] = 1;
      } else {
        xd->recon_above[0] = dst_buffer[0] + recon_yoffset;
        xd->recon_above[1] = dst_buffer[1] + recon_uvoffset;
        xd->recon_above[2] = dst_buffer[2] + recon_uvoffset;
  
        xd->recon_left[0] = xd->recon_above[0] - 1;
        xd->recon_left[1] = xd->recon_above[1] - 1;
        xd->recon_left[2] = xd->recon_above[2] - 1;
  
        xd->recon_above[0] -= xd->dst.y_stride;
        xd->recon_above[1] -= xd->dst.uv_stride;
        xd->recon_above[2] -= xd->dst.uv_stride;
  
        /* TODO: move to outside row loop */
        xd->recon_left_stride[0] = xd->dst.y_stride;
        xd->recon_left_stride[1] = xd->dst.uv_stride;
  
        setup_intra_recon_left(xd->recon_left[0], xd->recon_left[1],
                               xd->recon_left[2], xd->dst.y_stride,
                               xd->dst.uv_stride);
      }
  
      for (mb_col = 0; mb_col < pc->mb_cols; mb_col++) {
        *current_mb_col = mb_col - 1;
  
        if ((mb_col & (nsync - 1)) == 0) {
          while (mb_col > (*last_row_current_mb_col - nsync)) {
            x86_pause_hint();
            thread_sleep(0);
          }
        }
  
        /* Distance of MB to the various image edges.
         * These are specified to 8th pel as they are always
         * compared to values that are in 1/8th pel units.
         */
        xd->mb_to_left_edge = -((mb_col * 16) << 3);
        xd->mb_to_right_edge = ((pc->mb_cols - 1 - mb_col) * 16) << 3;
  
  #if CONFIG_ERROR_CONCEALMENT
        {
          int corrupt_residual =
              (!pbi->independent_partitions && pbi->frame_corrupt_residual) ||
              vp8dx_bool_error(xd->current_bc);
          if (pbi->ec_active &&
              (xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME) &&
              corrupt_residual) {
            /* We have an intra block with corrupt
             * coefficients, better to conceal with an inter
             * block.
             * Interpolate MVs from neighboring MBs
             *
             * Note that for the first mb with corrupt
             * residual in a frame, we might not discover
             * that before decoding the residual. That
             * happens after this check, and therefore no
             * inter concealment will be done.
             */
            vp8_interpolate_motion(xd, mb_row, mb_col, pc->mb_rows, pc->mb_cols);
          }
        }
  #endif
  
        xd->dst.y_buffer = dst_buffer[0] + recon_yoffset;
        xd->dst.u_buffer = dst_buffer[1] + recon_uvoffset;
        xd->dst.v_buffer = dst_buffer[2] + recon_uvoffset;
  
        xd->pre.y_buffer =
            ref_buffer[xd->mode_info_context->mbmi.ref_frame][0] + recon_yoffset;
        xd->pre.u_buffer =
            ref_buffer[xd->mode_info_context->mbmi.ref_frame][1] + recon_uvoffset;
        xd->pre.v_buffer =
            ref_buffer[xd->mode_info_context->mbmi.ref_frame][2] + recon_uvoffset;
  
        /* propagate errors from reference frames */
        xd->corrupted |= ref_fb_corrupted[xd->mode_info_context->mbmi.ref_frame];
  
        mt_decode_macroblock(pbi, xd, 0);
  
        xd->left_available = 1;
  
        /* check if the boolean decoder has suffered an error */
        xd->corrupted |= vp8dx_bool_error(xd->current_bc);
  
        xd->recon_above[0] += 16;
        xd->recon_above[1] += 8;
        xd->recon_above[2] += 8;
  
        if (!pbi->common.filter_level) {
          xd->recon_left[0] += 16;
          xd->recon_left[1] += 8;
          xd->recon_left[2] += 8;
        }
  
        if (pbi->common.filter_level) {
          int skip_lf = (xd->mode_info_context->mbmi.mode != B_PRED &&
                         xd->mode_info_context->mbmi.mode != SPLITMV &&
                         xd->mode_info_context->mbmi.mb_skip_coeff);
  
          const int mode_index =
              lfi_n->mode_lf_lut[xd->mode_info_context->mbmi.mode];
          const int seg = xd->mode_info_context->mbmi.segment_id;
          const int ref_frame = xd->mode_info_context->mbmi.ref_frame;
  
          filter_level = lfi_n->lvl[seg][ref_frame][mode_index];
  
          if (mb_row != pc->mb_rows - 1) {
            /* Save decoded MB last row data for next-row decoding */
            memcpy((pbi->mt_yabove_row[mb_row + 1] + 32 + mb_col * 16),
                   (xd->dst.y_buffer + 15 * recon_y_stride), 16);
            memcpy((pbi->mt_uabove_row[mb_row + 1] + 16 + mb_col * 8),
                   (xd->dst.u_buffer + 7 * recon_uv_stride), 8);
            memcpy((pbi->mt_vabove_row[mb_row + 1] + 16 + mb_col * 8),
                   (xd->dst.v_buffer + 7 * recon_uv_stride), 8);
          }
  
          /* save left_col for next MB decoding */
          if (mb_col != pc->mb_cols - 1) {
            MODE_INFO *next = xd->mode_info_context + 1;
  
            if (next->mbmi.ref_frame == INTRA_FRAME) {
              for (i = 0; i < 16; ++i) {
                pbi->mt_yleft_col[mb_row][i] =
                    xd->dst.y_buffer[i * recon_y_stride + 15];
              }
              for (i = 0; i < 8; ++i) {
                pbi->mt_uleft_col[mb_row][i] =
                    xd->dst.u_buffer[i * recon_uv_stride + 7];
                pbi->mt_vleft_col[mb_row][i] =
                    xd->dst.v_buffer[i * recon_uv_stride + 7];
              }
            }
          }
  
          /* loopfilter on this macroblock. */
          if (filter_level) {
            if (pc->filter_type == NORMAL_LOOPFILTER) {
              loop_filter_info lfi;
              FRAME_TYPE frame_type = pc->frame_type;
              const int hev_index = lfi_n->hev_thr_lut[frame_type][filter_level];
              lfi.mblim = lfi_n->mblim[filter_level];
              lfi.blim = lfi_n->blim[filter_level];
              lfi.lim = lfi_n->lim[filter_level];
              lfi.hev_thr = lfi_n->hev_thr[hev_index];
  
              if (mb_col > 0)
                vp8_loop_filter_mbv(xd->dst.y_buffer, xd->dst.u_buffer,
                                    xd->dst.v_buffer, recon_y_stride,
                                    recon_uv_stride, &lfi);
  
              if (!skip_lf)
                vp8_loop_filter_bv(xd->dst.y_buffer, xd->dst.u_buffer,
                                   xd->dst.v_buffer, recon_y_stride,
                                   recon_uv_stride, &lfi);
  
              /* don't apply across umv border */
              if (mb_row > 0)
                vp8_loop_filter_mbh(xd->dst.y_buffer, xd->dst.u_buffer,
                                    xd->dst.v_buffer, recon_y_stride,
                                    recon_uv_stride, &lfi);
  
              if (!skip_lf)
                vp8_loop_filter_bh(xd->dst.y_buffer, xd->dst.u_buffer,
                                   xd->dst.v_buffer, recon_y_stride,
                                   recon_uv_stride, &lfi);
            } else {
              if (mb_col > 0)
                vp8_loop_filter_simple_mbv(xd->dst.y_buffer, recon_y_stride,
                                           lfi_n->mblim[filter_level]);
  
              if (!skip_lf)
                vp8_loop_filter_simple_bv(xd->dst.y_buffer, recon_y_stride,
                                          lfi_n->blim[filter_level]);
  
              /* don't apply across umv border */
              if (mb_row > 0)
                vp8_loop_filter_simple_mbh(xd->dst.y_buffer, recon_y_stride,
                                           lfi_n->mblim[filter_level]);
  
              if (!skip_lf)
                vp8_loop_filter_simple_bh(xd->dst.y_buffer, recon_y_stride,
                                          lfi_n->blim[filter_level]);
            }
          }
        }
  
        recon_yoffset += 16;
        recon_uvoffset += 8;
  
        ++xd->mode_info_context; /* next mb */
  
        xd->above_context++;
      }
  
      /* adjust to the next row of mbs */
      if (pbi->common.filter_level) {
        if (mb_row != pc->mb_rows - 1) {
          int lasty = yv12_fb_lst->y_width + VP8BORDERINPIXELS;
          int lastuv = (yv12_fb_lst->y_width >> 1) + (VP8BORDERINPIXELS >> 1);
  
          for (i = 0; i < 4; ++i) {
            pbi->mt_yabove_row[mb_row + 1][lasty + i] =
                pbi->mt_yabove_row[mb_row + 1][lasty - 1];
            pbi->mt_uabove_row[mb_row + 1][lastuv + i] =
                pbi->mt_uabove_row[mb_row + 1][lastuv - 1];
            pbi->mt_vabove_row[mb_row + 1][lastuv + i] =
                pbi->mt_vabove_row[mb_row + 1][lastuv - 1];
          }
        }
      } else {
        vp8_extend_mb_row(yv12_fb_new, xd->dst.y_buffer + 16,
                          xd->dst.u_buffer + 8, xd->dst.v_buffer + 8);
      }
  
      /* last MB of row is ready just after extension is done */
      *current_mb_col = mb_col + nsync;
  
      ++xd->mode_info_context; /* skip prediction column */
      xd->up_available = 1;
  
      /* since we have multithread */
      xd->mode_info_context += xd->mode_info_stride * pbi->decoding_thread_count;
    }
  
    /* signal end of frame decoding if this thread processed the last mb_row */
    if (last_mb_row == (pc->mb_rows - 1)) sem_post(&pbi->h_event_end_decoding);
  }
  
  static THREAD_FUNCTION thread_decoding_proc(void *p_data) {
    int ithread = ((DECODETHREAD_DATA *)p_data)->ithread;
    VP8D_COMP *pbi = (VP8D_COMP *)(((DECODETHREAD_DATA *)p_data)->ptr1);
    MB_ROW_DEC *mbrd = (MB_ROW_DEC *)(((DECODETHREAD_DATA *)p_data)->ptr2);
    ENTROPY_CONTEXT_PLANES mb_row_left_context;
  
    while (1) {
      if (pbi->b_multithreaded_rd == 0) break;
  
      if (sem_wait(&pbi->h_event_start_decoding[ithread]) == 0) {
        if (pbi->b_multithreaded_rd == 0) {
          break;
        } else {
          MACROBLOCKD *xd = &mbrd->mbd;
          xd->left_context = &mb_row_left_context;
  
          mt_decode_mb_rows(pbi, xd, ithread + 1);
        }
      }
    }
  
    return 0;
  }
  
  void vp8_decoder_create_threads(VP8D_COMP *pbi) {
    int core_count = 0;
    unsigned int ithread;
  
    pbi->b_multithreaded_rd = 0;
    pbi->allocated_decoding_thread_count = 0;
  
    /* limit decoding threads to the max number of token partitions */
    core_count = (pbi->max_threads > 8) ? 8 : pbi->max_threads;
  
    /* limit decoding threads to the available cores */
    if (core_count > pbi->common.processor_core_count) {
      core_count = pbi->common.processor_core_count;
    }
  
    if (core_count > 1) {
      pbi->b_multithreaded_rd = 1;
      pbi->decoding_thread_count = core_count - 1;
  
      CALLOC_ARRAY(pbi->h_decoding_thread, pbi->decoding_thread_count);
      CALLOC_ARRAY(pbi->h_event_start_decoding, pbi->decoding_thread_count);
      CALLOC_ARRAY_ALIGNED(pbi->mb_row_di, pbi->decoding_thread_count, 32);
      CALLOC_ARRAY(pbi->de_thread_data, pbi->decoding_thread_count);
  
      if (sem_init(&pbi->h_event_end_decoding, 0, 0)) {
        vpx_internal_error(&pbi->common.error, VPX_CODEC_MEM_ERROR,
                           "Failed to initialize semaphore");
      }
  
      for (ithread = 0; ithread < pbi->decoding_thread_count; ++ithread) {
        if (sem_init(&pbi->h_event_start_decoding[ithread], 0, 0)) break;
  
        vp8_setup_block_dptrs(&pbi->mb_row_di[ithread].mbd);
  
        pbi->de_thread_data[ithread].ithread = ithread;
        pbi->de_thread_data[ithread].ptr1 = (void *)pbi;
        pbi->de_thread_data[ithread].ptr2 = (void *)&pbi->mb_row_di[ithread];
  
        if (pthread_create(&pbi->h_decoding_thread[ithread], 0,
                           thread_decoding_proc, &pbi->de_thread_data[ithread])) {
          sem_destroy(&pbi->h_event_start_decoding[ithread]);
          break;
        }
      }
  
      pbi->allocated_decoding_thread_count = ithread;
      if (pbi->allocated_decoding_thread_count !=
          (int)pbi->decoding_thread_count) {
        /* the remainder of cleanup cases will be handled in
         * vp8_decoder_remove_threads(). */
        if (pbi->allocated_decoding_thread_count == 0) {
          sem_destroy(&pbi->h_event_end_decoding);
        }
        vpx_internal_error(&pbi->common.error, VPX_CODEC_MEM_ERROR,
                           "Failed to create threads");
      }
    }
  }
  
  void vp8mt_de_alloc_temp_buffers(VP8D_COMP *pbi, int mb_rows) {
    int i;
  
    vpx_free(pbi->mt_current_mb_col);
    pbi->mt_current_mb_col = NULL;
  
    /* Free above_row buffers. */
    if (pbi->mt_yabove_row) {
      for (i = 0; i < mb_rows; ++i) {
        vpx_free(pbi->mt_yabove_row[i]);
        pbi->mt_yabove_row[i] = NULL;
      }
      vpx_free(pbi->mt_yabove_row);
      pbi->mt_yabove_row = NULL;
    }
  
    if (pbi->mt_uabove_row) {
      for (i = 0; i < mb_rows; ++i) {
        vpx_free(pbi->mt_uabove_row[i]);
        pbi->mt_uabove_row[i] = NULL;
      }
      vpx_free(pbi->mt_uabove_row);
      pbi->mt_uabove_row = NULL;
    }
  
    if (pbi->mt_vabove_row) {
      for (i = 0; i < mb_rows; ++i) {
        vpx_free(pbi->mt_vabove_row[i]);
        pbi->mt_vabove_row[i] = NULL;
      }
      vpx_free(pbi->mt_vabove_row);
      pbi->mt_vabove_row = NULL;
    }
  
    /* Free left_col buffers. */
    if (pbi->mt_yleft_col) {
      for (i = 0; i < mb_rows; ++i) {
        vpx_free(pbi->mt_yleft_col[i]);
        pbi->mt_yleft_col[i] = NULL;
      }
      vpx_free(pbi->mt_yleft_col);
      pbi->mt_yleft_col = NULL;
    }
  
    if (pbi->mt_uleft_col) {
      for (i = 0; i < mb_rows; ++i) {
        vpx_free(pbi->mt_uleft_col[i]);
        pbi->mt_uleft_col[i] = NULL;
      }
      vpx_free(pbi->mt_uleft_col);
      pbi->mt_uleft_col = NULL;
    }
  
    if (pbi->mt_vleft_col) {
      for (i = 0; i < mb_rows; ++i) {
        vpx_free(pbi->mt_vleft_col[i]);
        pbi->mt_vleft_col[i] = NULL;
      }
      vpx_free(pbi->mt_vleft_col);
      pbi->mt_vleft_col = NULL;
    }
  }
  
  void vp8mt_alloc_temp_buffers(VP8D_COMP *pbi, int width, int prev_mb_rows) {
    VP8_COMMON *const pc = &pbi->common;
    int i;
    int uv_width;
  
    if (pbi->b_multithreaded_rd) {
      vp8mt_de_alloc_temp_buffers(pbi, prev_mb_rows);
  
      /* our internal buffers are always multiples of 16 */
      if ((width & 0xf) != 0) width += 16 - (width & 0xf);
  
      if (width < 640) {
        pbi->sync_range = 1;
      } else if (width <= 1280) {
        pbi->sync_range = 8;
      } else if (width <= 2560) {
        pbi->sync_range = 16;
      } else {
        pbi->sync_range = 32;
      }
  
      uv_width = width >> 1;
  
      /* Allocate an int for each mb row. */
      CALLOC_ARRAY(pbi->mt_current_mb_col, pc->mb_rows);
  
      /* Allocate memory for above_row buffers. */
      CALLOC_ARRAY(pbi->mt_yabove_row, pc->mb_rows);
      for (i = 0; i < pc->mb_rows; ++i)
        CHECK_MEM_ERROR(pbi->mt_yabove_row[i],
                        vpx_memalign(16, sizeof(unsigned char) *
                                             (width + (VP8BORDERINPIXELS << 1))));
  
      CALLOC_ARRAY(pbi->mt_uabove_row, pc->mb_rows);
      for (i = 0; i < pc->mb_rows; ++i)
        CHECK_MEM_ERROR(pbi->mt_uabove_row[i],
                        vpx_memalign(16, sizeof(unsigned char) *
                                             (uv_width + VP8BORDERINPIXELS)));
  
      CALLOC_ARRAY(pbi->mt_vabove_row, pc->mb_rows);
      for (i = 0; i < pc->mb_rows; ++i)
        CHECK_MEM_ERROR(pbi->mt_vabove_row[i],
                        vpx_memalign(16, sizeof(unsigned char) *
                                             (uv_width + VP8BORDERINPIXELS)));
  
      /* Allocate memory for left_col buffers. */
      CALLOC_ARRAY(pbi->mt_yleft_col, pc->mb_rows);
      for (i = 0; i < pc->mb_rows; ++i)
        CHECK_MEM_ERROR(pbi->mt_yleft_col[i],
                        vpx_calloc(sizeof(unsigned char) * 16, 1));
  
      CALLOC_ARRAY(pbi->mt_uleft_col, pc->mb_rows);
      for (i = 0; i < pc->mb_rows; ++i)
        CHECK_MEM_ERROR(pbi->mt_uleft_col[i],
                        vpx_calloc(sizeof(unsigned char) * 8, 1));
  
      CALLOC_ARRAY(pbi->mt_vleft_col, pc->mb_rows);
      for (i = 0; i < pc->mb_rows; ++i)
        CHECK_MEM_ERROR(pbi->mt_vleft_col[i],
                        vpx_calloc(sizeof(unsigned char) * 8, 1));
    }
  }
  
  void vp8_decoder_remove_threads(VP8D_COMP *pbi) {
    /* shutdown MB Decoding thread; */
    if (pbi->b_multithreaded_rd) {
      int i;
      pbi->b_multithreaded_rd = 0;
  
      /* allow all threads to exit */
      for (i = 0; i < pbi->allocated_decoding_thread_count; ++i) {
        sem_post(&pbi->h_event_start_decoding[i]);
        pthread_join(pbi->h_decoding_thread[i], NULL);
      }
  
      for (i = 0; i < pbi->allocated_decoding_thread_count; ++i) {
        sem_destroy(&pbi->h_event_start_decoding[i]);
      }
  
      if (pbi->allocated_decoding_thread_count) {
        sem_destroy(&pbi->h_event_end_decoding);
      }
  
      vpx_free(pbi->h_decoding_thread);
      pbi->h_decoding_thread = NULL;
  
      vpx_free(pbi->h_event_start_decoding);
      pbi->h_event_start_decoding = NULL;
  
      vpx_free(pbi->mb_row_di);
      pbi->mb_row_di = NULL;
  
      vpx_free(pbi->de_thread_data);
      pbi->de_thread_data = NULL;
  
      vp8mt_de_alloc_temp_buffers(pbi, pbi->common.mb_rows);
    }
  }
  
  void vp8mt_decode_mb_rows(VP8D_COMP *pbi, MACROBLOCKD *xd) {
    VP8_COMMON *pc = &pbi->common;
    unsigned int i;
    int j;
  
    int filter_level = pc->filter_level;
    YV12_BUFFER_CONFIG *yv12_fb_new = pbi->dec_fb_ref[INTRA_FRAME];
  
    if (filter_level) {
      /* Set above_row buffer to 127 for decoding first MB row */
      memset(pbi->mt_yabove_row[0] + VP8BORDERINPIXELS - 1, 127,
             yv12_fb_new->y_width + 5);
      memset(pbi->mt_uabove_row[0] + (VP8BORDERINPIXELS >> 1) - 1, 127,
             (yv12_fb_new->y_width >> 1) + 5);
      memset(pbi->mt_vabove_row[0] + (VP8BORDERINPIXELS >> 1) - 1, 127,
             (yv12_fb_new->y_width >> 1) + 5);
  
      for (j = 1; j < pc->mb_rows; ++j) {
        memset(pbi->mt_yabove_row[j] + VP8BORDERINPIXELS - 1, (unsigned char)129,
               1);
        memset(pbi->mt_uabove_row[j] + (VP8BORDERINPIXELS >> 1) - 1,
               (unsigned char)129, 1);
        memset(pbi->mt_vabove_row[j] + (VP8BORDERINPIXELS >> 1) - 1,
               (unsigned char)129, 1);
      }
  
      /* Set left_col to 129 initially */
      for (j = 0; j < pc->mb_rows; ++j) {
        memset(pbi->mt_yleft_col[j], (unsigned char)129, 16);
        memset(pbi->mt_uleft_col[j], (unsigned char)129, 8);
        memset(pbi->mt_vleft_col[j], (unsigned char)129, 8);
      }
  
      /* Initialize the loop filter for this frame. */
      vp8_loop_filter_frame_init(pc, &pbi->mb, filter_level);
    } else {
      vp8_setup_intra_recon_top_line(yv12_fb_new);
    }
  
    setup_decoding_thread_data(pbi, xd, pbi->mb_row_di,
                               pbi->decoding_thread_count);
  
    for (i = 0; i < pbi->decoding_thread_count; ++i) {
      sem_post(&pbi->h_event_start_decoding[i]);
    }
  
    mt_decode_mb_rows(pbi, xd, 0);
  
    sem_wait(&pbi->h_event_end_decoding); /* add back for each frame */
  }
  