shithub: libvpx

Download patch

ref: 1d0db7134ed4b00c97009edda01b74e6fa062e8f
parent: fbd3db91bb94624ebc88c2af6bc61d6cc2c1dc5d
parent: dbd57c2663ce62a74c5f303ac906bddcc03628b5
author: John Koleszar <jkoleszar@google.com>
date: Fri Sep 24 20:05:06 EDT 2010

Merge remote branch 'internal/upstream' into HEAD

--- a/build/make/configure.sh
+++ b/build/make/configure.sh
@@ -562,6 +562,9 @@
     mips*)        enable mips;;
     esac
 
+    # PIC is probably what we want when building shared libs
+    enabled shared && soft_enable pic
+
     # Handle darwin variants
     case ${toolchain} in
         *-darwin8-gcc)
@@ -880,9 +883,9 @@
     enabled gcov &&
         check_add_cflags -fprofile-arcs -ftest-coverage &&
         check_add_ldflags -fprofile-arcs -ftest-coverage
-    enabled optimizations && check_add_cflags -O3
-    if enabled rvct; then
-        enabled optimizations && check_add_cflags -Otime
+    if enabled optimizations; then
+        enabled rvct && check_add_cflags -Otime
+        enabled small && check_add_cflags -O2 || check_add_cflags -O3
     fi
 
     # Position Independant Code (PIC) support, for building relocatable
--- a/configure
+++ b/configure
@@ -38,6 +38,7 @@
   ${toggle_realtime_only}         enable this option while building for real-time encoding
   ${toggle_runtime_cpu_detect}    runtime cpu detection
   ${toggle_shared}                shared library support
+  ${toggle_small}                 favor smaller size over speed
   ${toggle_arm_asm_detok}         assembly version of the detokenizer (ARM platforms only)
 
 Codecs:
@@ -246,6 +247,7 @@
     spatial_resampling
     realtime_only
     shared
+    small
     arm_asm_detok
 
     experimental
@@ -286,6 +288,7 @@
     spatial_resampling
     realtime_only
     shared
+    small
     arm_asm_detok
     experimental
 "
--- a/vp8/common/reconintra_mt.c
+++ /dev/null
@@ -1,980 +1,0 @@
-/*
- *  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_ports/config.h"
-#include "recon.h"
-#include "reconintra.h"
-#include "vpx_mem/vpx_mem.h"
-#include "onyxd_int.h"
-
-// For skip_recon_mb(), add vp8_build_intra_predictors_mby_s(MACROBLOCKD *x) and
-// vp8_build_intra_predictors_mbuv_s(MACROBLOCKD *x).
-
-void vp8mt_build_intra_predictors_mby(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
-{
-#if CONFIG_MULTITHREAD
-    unsigned char *yabove_row;    // = x->dst.y_buffer - x->dst.y_stride;
-    unsigned char *yleft_col;
-    unsigned char yleft_buf[16];
-    unsigned char ytop_left;      // = yabove_row[-1];
-    unsigned char *ypred_ptr = x->predictor;
-    int r, c, i;
-
-    if (pbi->common.filter_level)
-    {
-        yabove_row = pbi->mt_yabove_row[mb_row] + mb_col*16 +32;
-        yleft_col = pbi->mt_yleft_col[mb_row];
-    } else
-    {
-        yabove_row = x->dst.y_buffer - x->dst.y_stride;
-
-        for (i = 0; i < 16; i++)
-            yleft_buf[i] = x->dst.y_buffer [i* x->dst.y_stride -1];
-        yleft_col = yleft_buf;
-    }
-
-    ytop_left = yabove_row[-1];
-
-    // for Y
-    switch (x->mode_info_context->mbmi.mode)
-    {
-    case DC_PRED:
-    {
-        int expected_dc;
-        int i;
-        int shift;
-        int average = 0;
-
-
-        if (x->up_available || x->left_available)
-        {
-            if (x->up_available)
-            {
-                for (i = 0; i < 16; i++)
-                {
-                    average += yabove_row[i];
-                }
-            }
-
-            if (x->left_available)
-            {
-
-                for (i = 0; i < 16; i++)
-                {
-                    average += yleft_col[i];
-                }
-
-            }
-
-
-
-            shift = 3 + x->up_available + x->left_available;
-            expected_dc = (average + (1 << (shift - 1))) >> shift;
-        }
-        else
-        {
-            expected_dc = 128;
-        }
-
-        vpx_memset(ypred_ptr, expected_dc, 256);
-    }
-    break;
-    case V_PRED:
-    {
-
-        for (r = 0; r < 16; r++)
-        {
-
-            ((int *)ypred_ptr)[0] = ((int *)yabove_row)[0];
-            ((int *)ypred_ptr)[1] = ((int *)yabove_row)[1];
-            ((int *)ypred_ptr)[2] = ((int *)yabove_row)[2];
-            ((int *)ypred_ptr)[3] = ((int *)yabove_row)[3];
-            ypred_ptr += 16;
-        }
-    }
-    break;
-    case H_PRED:
-    {
-
-        for (r = 0; r < 16; r++)
-        {
-
-            vpx_memset(ypred_ptr, yleft_col[r], 16);
-            ypred_ptr += 16;
-        }
-
-    }
-    break;
-    case TM_PRED:
-    {
-
-        for (r = 0; r < 16; r++)
-        {
-            for (c = 0; c < 16; c++)
-            {
-                int pred =  yleft_col[r] + yabove_row[ c] - ytop_left;
-
-                if (pred < 0)
-                    pred = 0;
-
-                if (pred > 255)
-                    pred = 255;
-
-                ypred_ptr[c] = pred;
-            }
-
-            ypred_ptr += 16;
-        }
-
-    }
-    break;
-    case B_PRED:
-    case NEARESTMV:
-    case NEARMV:
-    case ZEROMV:
-    case NEWMV:
-    case SPLITMV:
-    case MB_MODE_COUNT:
-        break;
-    }
-#else
-    (void) pbi;
-    (void) x;
-    (void) mb_row;
-    (void) mb_col;
-#endif
-}
-
-void vp8mt_build_intra_predictors_mby_s(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
-{
-#if CONFIG_MULTITHREAD
-    unsigned char *yabove_row;    // = x->dst.y_buffer - x->dst.y_stride;
-    unsigned char *yleft_col;
-    unsigned char yleft_buf[16];
-    unsigned char ytop_left;      // = yabove_row[-1];
-    unsigned char *ypred_ptr = x->predictor;
-    int r, c, i;
-
-    int y_stride = x->dst.y_stride;
-    ypred_ptr = x->dst.y_buffer; //x->predictor;
-
-    if (pbi->common.filter_level)
-    {
-        yabove_row = pbi->mt_yabove_row[mb_row] + mb_col*16 +32;
-        yleft_col = pbi->mt_yleft_col[mb_row];
-    } else
-    {
-        yabove_row = x->dst.y_buffer - x->dst.y_stride;
-
-        for (i = 0; i < 16; i++)
-            yleft_buf[i] = x->dst.y_buffer [i* x->dst.y_stride -1];
-        yleft_col = yleft_buf;
-    }
-
-    ytop_left = yabove_row[-1];
-
-    // for Y
-    switch (x->mode_info_context->mbmi.mode)
-    {
-    case DC_PRED:
-    {
-        int expected_dc;
-        int i;
-        int shift;
-        int average = 0;
-
-
-        if (x->up_available || x->left_available)
-        {
-            if (x->up_available)
-            {
-                for (i = 0; i < 16; i++)
-                {
-                    average += yabove_row[i];
-                }
-            }
-
-            if (x->left_available)
-            {
-
-                for (i = 0; i < 16; i++)
-                {
-                    average += yleft_col[i];
-                }
-
-            }
-
-
-
-            shift = 3 + x->up_available + x->left_available;
-            expected_dc = (average + (1 << (shift - 1))) >> shift;
-        }
-        else
-        {
-            expected_dc = 128;
-        }
-
-        //vpx_memset(ypred_ptr, expected_dc, 256);
-        for (r = 0; r < 16; r++)
-        {
-            vpx_memset(ypred_ptr, expected_dc, 16);
-            ypred_ptr += y_stride; //16;
-        }
-    }
-    break;
-    case V_PRED:
-    {
-
-        for (r = 0; r < 16; r++)
-        {
-
-            ((int *)ypred_ptr)[0] = ((int *)yabove_row)[0];
-            ((int *)ypred_ptr)[1] = ((int *)yabove_row)[1];
-            ((int *)ypred_ptr)[2] = ((int *)yabove_row)[2];
-            ((int *)ypred_ptr)[3] = ((int *)yabove_row)[3];
-            ypred_ptr += y_stride; //16;
-        }
-    }
-    break;
-    case H_PRED:
-    {
-
-        for (r = 0; r < 16; r++)
-        {
-
-            vpx_memset(ypred_ptr, yleft_col[r], 16);
-            ypred_ptr += y_stride;  //16;
-        }
-
-    }
-    break;
-    case TM_PRED:
-    {
-
-        for (r = 0; r < 16; r++)
-        {
-            for (c = 0; c < 16; c++)
-            {
-                int pred =  yleft_col[r] + yabove_row[ c] - ytop_left;
-
-                if (pred < 0)
-                    pred = 0;
-
-                if (pred > 255)
-                    pred = 255;
-
-                ypred_ptr[c] = pred;
-            }
-
-            ypred_ptr += y_stride;  //16;
-        }
-
-    }
-    break;
-    case B_PRED:
-    case NEARESTMV:
-    case NEARMV:
-    case ZEROMV:
-    case NEWMV:
-    case SPLITMV:
-    case MB_MODE_COUNT:
-        break;
-    }
-#else
-    (void) pbi;
-    (void) x;
-    (void) mb_row;
-    (void) mb_col;
-#endif
-}
-
-void vp8mt_build_intra_predictors_mbuv(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
-{
-#if CONFIG_MULTITHREAD
-    unsigned char *uabove_row;   // = x->dst.u_buffer - x->dst.uv_stride;
-    unsigned char *uleft_col;    //[16];
-    unsigned char uleft_buf[8];
-    unsigned char utop_left;     // = uabove_row[-1];
-    unsigned char *vabove_row;   // = x->dst.v_buffer - x->dst.uv_stride;
-    unsigned char *vleft_col;    //[20];
-    unsigned char vleft_buf[8];
-    unsigned char vtop_left;     // = vabove_row[-1];
-    unsigned char *upred_ptr = &x->predictor[256];
-    unsigned char *vpred_ptr = &x->predictor[320];
-    int i, j;
-
-    if (pbi->common.filter_level)
-    {
-        uabove_row = pbi->mt_uabove_row[mb_row] + mb_col*8 +16;
-        vabove_row = pbi->mt_vabove_row[mb_row] + mb_col*8 +16;
-        uleft_col = pbi->mt_uleft_col[mb_row];
-        vleft_col = pbi->mt_vleft_col[mb_row];
-    } else
-    {
-        uabove_row = x->dst.u_buffer - x->dst.uv_stride;
-        vabove_row = x->dst.v_buffer - x->dst.uv_stride;
-
-        for (i = 0; i < 8; i++)
-        {
-            uleft_buf[i] = x->dst.u_buffer [i* x->dst.uv_stride -1];
-            vleft_buf[i] = x->dst.v_buffer [i* x->dst.uv_stride -1];
-        }
-        uleft_col = uleft_buf;
-        vleft_col = vleft_buf;
-    }
-    utop_left = uabove_row[-1];
-    vtop_left = vabove_row[-1];
-
-    switch (x->mode_info_context->mbmi.uv_mode)
-    {
-    case DC_PRED:
-    {
-        int expected_udc;
-        int expected_vdc;
-        int i;
-        int shift;
-        int Uaverage = 0;
-        int Vaverage = 0;
-
-        if (x->up_available)
-        {
-            for (i = 0; i < 8; i++)
-            {
-                Uaverage += uabove_row[i];
-                Vaverage += vabove_row[i];
-            }
-        }
-
-        if (x->left_available)
-        {
-            for (i = 0; i < 8; i++)
-            {
-                Uaverage += uleft_col[i];
-                Vaverage += vleft_col[i];
-            }
-        }
-
-        if (!x->up_available && !x->left_available)
-        {
-            expected_udc = 128;
-            expected_vdc = 128;
-        }
-        else
-        {
-            shift = 2 + x->up_available + x->left_available;
-            expected_udc = (Uaverage + (1 << (shift - 1))) >> shift;
-            expected_vdc = (Vaverage + (1 << (shift - 1))) >> shift;
-        }
-
-
-        vpx_memset(upred_ptr, expected_udc, 64);
-        vpx_memset(vpred_ptr, expected_vdc, 64);
-
-
-    }
-    break;
-    case V_PRED:
-    {
-        int i;
-
-        for (i = 0; i < 8; i++)
-        {
-            vpx_memcpy(upred_ptr, uabove_row, 8);
-            vpx_memcpy(vpred_ptr, vabove_row, 8);
-            upred_ptr += 8;
-            vpred_ptr += 8;
-        }
-
-    }
-    break;
-    case H_PRED:
-    {
-        int i;
-
-        for (i = 0; i < 8; i++)
-        {
-            vpx_memset(upred_ptr, uleft_col[i], 8);
-            vpx_memset(vpred_ptr, vleft_col[i], 8);
-            upred_ptr += 8;
-            vpred_ptr += 8;
-        }
-    }
-
-    break;
-    case TM_PRED:
-    {
-        int i;
-
-        for (i = 0; i < 8; i++)
-        {
-            for (j = 0; j < 8; j++)
-            {
-                int predu = uleft_col[i] + uabove_row[j] - utop_left;
-                int predv = vleft_col[i] + vabove_row[j] - vtop_left;
-
-                if (predu < 0)
-                    predu = 0;
-
-                if (predu > 255)
-                    predu = 255;
-
-                if (predv < 0)
-                    predv = 0;
-
-                if (predv > 255)
-                    predv = 255;
-
-                upred_ptr[j] = predu;
-                vpred_ptr[j] = predv;
-            }
-
-            upred_ptr += 8;
-            vpred_ptr += 8;
-        }
-
-    }
-    break;
-    case B_PRED:
-    case NEARESTMV:
-    case NEARMV:
-    case ZEROMV:
-    case NEWMV:
-    case SPLITMV:
-    case MB_MODE_COUNT:
-        break;
-    }
-#else
-    (void) pbi;
-    (void) x;
-    (void) mb_row;
-    (void) mb_col;
-#endif
-}
-
-void vp8mt_build_intra_predictors_mbuv_s(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
-{
-#if CONFIG_MULTITHREAD
-    unsigned char *uabove_row;  // = x->dst.u_buffer - x->dst.uv_stride;
-    unsigned char *uleft_col;   //[16];
-    unsigned char uleft_buf[8];
-    unsigned char utop_left;    // = uabove_row[-1];
-    unsigned char *vabove_row;  // = x->dst.v_buffer - x->dst.uv_stride;
-    unsigned char *vleft_col;   //[20];
-    unsigned char vleft_buf[8];
-    unsigned char vtop_left;    // = vabove_row[-1];
-    unsigned char *upred_ptr = x->dst.u_buffer; //&x->predictor[256];
-    unsigned char *vpred_ptr = x->dst.v_buffer; //&x->predictor[320];
-    int uv_stride = x->dst.uv_stride;
-    int i, j;
-
-    if (pbi->common.filter_level)
-    {
-        uabove_row = pbi->mt_uabove_row[mb_row] + mb_col*8 +16;
-        vabove_row = pbi->mt_vabove_row[mb_row] + mb_col*8 +16;
-        uleft_col = pbi->mt_uleft_col[mb_row];
-        vleft_col = pbi->mt_vleft_col[mb_row];
-    } else
-    {
-        uabove_row = x->dst.u_buffer - x->dst.uv_stride;
-        vabove_row = x->dst.v_buffer - x->dst.uv_stride;
-
-        for (i = 0; i < 8; i++)
-        {
-            uleft_buf[i] = x->dst.u_buffer [i* x->dst.uv_stride -1];
-            vleft_buf[i] = x->dst.v_buffer [i* x->dst.uv_stride -1];
-        }
-        uleft_col = uleft_buf;
-        vleft_col = vleft_buf;
-    }
-    utop_left = uabove_row[-1];
-    vtop_left = vabove_row[-1];
-
-    switch (x->mode_info_context->mbmi.uv_mode)
-    {
-    case DC_PRED:
-    {
-        int expected_udc;
-        int expected_vdc;
-        int i;
-        int shift;
-        int Uaverage = 0;
-        int Vaverage = 0;
-
-        if (x->up_available)
-        {
-            for (i = 0; i < 8; i++)
-            {
-                Uaverage += uabove_row[i];
-                Vaverage += vabove_row[i];
-            }
-        }
-
-        if (x->left_available)
-        {
-            for (i = 0; i < 8; i++)
-            {
-                Uaverage += uleft_col[i];
-                Vaverage += vleft_col[i];
-            }
-        }
-
-        if (!x->up_available && !x->left_available)
-        {
-            expected_udc = 128;
-            expected_vdc = 128;
-        }
-        else
-        {
-            shift = 2 + x->up_available + x->left_available;
-            expected_udc = (Uaverage + (1 << (shift - 1))) >> shift;
-            expected_vdc = (Vaverage + (1 << (shift - 1))) >> shift;
-        }
-
-
-        //vpx_memset(upred_ptr,expected_udc,64);
-        //vpx_memset(vpred_ptr,expected_vdc,64);
-        for (i = 0; i < 8; i++)
-        {
-            vpx_memset(upred_ptr, expected_udc, 8);
-            vpx_memset(vpred_ptr, expected_vdc, 8);
-            upred_ptr += uv_stride; //8;
-            vpred_ptr += uv_stride; //8;
-        }
-    }
-    break;
-    case V_PRED:
-    {
-        int i;
-
-        for (i = 0; i < 8; i++)
-        {
-            vpx_memcpy(upred_ptr, uabove_row, 8);
-            vpx_memcpy(vpred_ptr, vabove_row, 8);
-            upred_ptr += uv_stride; //8;
-            vpred_ptr += uv_stride; //8;
-        }
-
-    }
-    break;
-    case H_PRED:
-    {
-        int i;
-
-        for (i = 0; i < 8; i++)
-        {
-            vpx_memset(upred_ptr, uleft_col[i], 8);
-            vpx_memset(vpred_ptr, vleft_col[i], 8);
-            upred_ptr += uv_stride; //8;
-            vpred_ptr += uv_stride; //8;
-        }
-    }
-
-    break;
-    case TM_PRED:
-    {
-        int i;
-
-        for (i = 0; i < 8; i++)
-        {
-            for (j = 0; j < 8; j++)
-            {
-                int predu = uleft_col[i] + uabove_row[j] - utop_left;
-                int predv = vleft_col[i] + vabove_row[j] - vtop_left;
-
-                if (predu < 0)
-                    predu = 0;
-
-                if (predu > 255)
-                    predu = 255;
-
-                if (predv < 0)
-                    predv = 0;
-
-                if (predv > 255)
-                    predv = 255;
-
-                upred_ptr[j] = predu;
-                vpred_ptr[j] = predv;
-            }
-
-            upred_ptr += uv_stride; //8;
-            vpred_ptr += uv_stride; //8;
-        }
-
-    }
-    break;
-    case B_PRED:
-    case NEARESTMV:
-    case NEARMV:
-    case ZEROMV:
-    case NEWMV:
-    case SPLITMV:
-    case MB_MODE_COUNT:
-        break;
-    }
-#else
-    (void) pbi;
-    (void) x;
-    (void) mb_row;
-    (void) mb_col;
-#endif
-}
-
-
-void vp8mt_predict_intra4x4(VP8D_COMP *pbi,
-                          MACROBLOCKD *xd,
-                          int b_mode,
-                          unsigned char *predictor,
-                          int mb_row,
-                          int mb_col,
-                          int num)
-{
-#if CONFIG_MULTITHREAD
-    int i, r, c;
-
-    unsigned char *Above;   // = *(x->base_dst) + x->dst - x->dst_stride;
-    unsigned char Left[4];
-    unsigned char top_left; // = Above[-1];
-
-    BLOCKD *x = &xd->block[num];
-
-    //Caution: For some b_mode, it needs 8 pixels (4 above + 4 above-right).
-    if (num < 4 && pbi->common.filter_level)
-        Above = pbi->mt_yabove_row[mb_row] + mb_col*16 + num*4 + 32;
-    else
-        Above = *(x->base_dst) + x->dst - x->dst_stride;
-
-    if (num%4==0 && pbi->common.filter_level)
-    {
-        for (i=0; i<4; i++)
-            Left[i] = pbi->mt_yleft_col[mb_row][num + i];
-    }else
-    {
-        Left[0] = (*(x->base_dst))[x->dst - 1];
-        Left[1] = (*(x->base_dst))[x->dst - 1 + x->dst_stride];
-        Left[2] = (*(x->base_dst))[x->dst - 1 + 2 * x->dst_stride];
-        Left[3] = (*(x->base_dst))[x->dst - 1 + 3 * x->dst_stride];
-    }
-
-    if ((num==4 || num==8 || num==12) && pbi->common.filter_level)
-        top_left = pbi->mt_yleft_col[mb_row][num-1];
-    else
-        top_left = Above[-1];
-
-     switch (b_mode)
-    {
-    case B_DC_PRED:
-    {
-        int expected_dc = 0;
-
-        for (i = 0; i < 4; i++)
-        {
-            expected_dc += Above[i];
-            expected_dc += Left[i];
-        }
-
-        expected_dc = (expected_dc + 4) >> 3;
-
-        for (r = 0; r < 4; r++)
-        {
-            for (c = 0; c < 4; c++)
-            {
-                predictor[c] = expected_dc;
-            }
-
-            predictor += 16;
-        }
-    }
-    break;
-    case B_TM_PRED:
-    {
-        // prediction similar to true_motion prediction
-        for (r = 0; r < 4; r++)
-        {
-            for (c = 0; c < 4; c++)
-            {
-                int pred = Above[c] - top_left + Left[r];
-
-                if (pred < 0)
-                    pred = 0;
-
-                if (pred > 255)
-                    pred = 255;
-
-                predictor[c] = pred;
-            }
-
-            predictor += 16;
-        }
-    }
-    break;
-
-    case B_VE_PRED:
-    {
-
-        unsigned int ap[4];
-        ap[0] = (top_left  + 2 * Above[0] + Above[1] + 2) >> 2;
-        ap[1] = (Above[0] + 2 * Above[1] + Above[2] + 2) >> 2;
-        ap[2] = (Above[1] + 2 * Above[2] + Above[3] + 2) >> 2;
-        ap[3] = (Above[2] + 2 * Above[3] + Above[4] + 2) >> 2;
-
-        for (r = 0; r < 4; r++)
-        {
-            for (c = 0; c < 4; c++)
-            {
-
-                predictor[c] = ap[c];
-            }
-
-            predictor += 16;
-        }
-
-    }
-    break;
-
-
-    case B_HE_PRED:
-    {
-
-        unsigned int lp[4];
-        lp[0] = (top_left + 2 * Left[0] + Left[1] + 2) >> 2;
-        lp[1] = (Left[0] + 2 * Left[1] + Left[2] + 2) >> 2;
-        lp[2] = (Left[1] + 2 * Left[2] + Left[3] + 2) >> 2;
-        lp[3] = (Left[2] + 2 * Left[3] + Left[3] + 2) >> 2;
-
-        for (r = 0; r < 4; r++)
-        {
-            for (c = 0; c < 4; c++)
-            {
-                predictor[c] = lp[r];
-            }
-
-            predictor += 16;
-        }
-    }
-    break;
-    case B_LD_PRED:
-    {
-        unsigned char *ptr = Above;
-        predictor[0 * 16 + 0] = (ptr[0] + ptr[1] * 2 + ptr[2] + 2) >> 2;
-        predictor[0 * 16 + 1] =
-            predictor[1 * 16 + 0] = (ptr[1] + ptr[2] * 2 + ptr[3] + 2) >> 2;
-        predictor[0 * 16 + 2] =
-            predictor[1 * 16 + 1] =
-                predictor[2 * 16 + 0] = (ptr[2] + ptr[3] * 2 + ptr[4] + 2) >> 2;
-        predictor[0 * 16 + 3] =
-            predictor[1 * 16 + 2] =
-                predictor[2 * 16 + 1] =
-                    predictor[3 * 16 + 0] = (ptr[3] + ptr[4] * 2 + ptr[5] + 2) >> 2;
-        predictor[1 * 16 + 3] =
-            predictor[2 * 16 + 2] =
-                predictor[3 * 16 + 1] = (ptr[4] + ptr[5] * 2 + ptr[6] + 2) >> 2;
-        predictor[2 * 16 + 3] =
-            predictor[3 * 16 + 2] = (ptr[5] + ptr[6] * 2 + ptr[7] + 2) >> 2;
-        predictor[3 * 16 + 3] = (ptr[6] + ptr[7] * 2 + ptr[7] + 2) >> 2;
-
-    }
-    break;
-    case B_RD_PRED:
-    {
-
-        unsigned char pp[9];
-
-        pp[0] = Left[3];
-        pp[1] = Left[2];
-        pp[2] = Left[1];
-        pp[3] = Left[0];
-        pp[4] = top_left;
-        pp[5] = Above[0];
-        pp[6] = Above[1];
-        pp[7] = Above[2];
-        pp[8] = Above[3];
-
-        predictor[3 * 16 + 0] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
-        predictor[3 * 16 + 1] =
-            predictor[2 * 16 + 0] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
-        predictor[3 * 16 + 2] =
-            predictor[2 * 16 + 1] =
-                predictor[1 * 16 + 0] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
-        predictor[3 * 16 + 3] =
-            predictor[2 * 16 + 2] =
-                predictor[1 * 16 + 1] =
-                    predictor[0 * 16 + 0] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
-        predictor[2 * 16 + 3] =
-            predictor[1 * 16 + 2] =
-                predictor[0 * 16 + 1] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
-        predictor[1 * 16 + 3] =
-            predictor[0 * 16 + 2] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
-        predictor[0 * 16 + 3] = (pp[6] + pp[7] * 2 + pp[8] + 2) >> 2;
-
-    }
-    break;
-    case B_VR_PRED:
-    {
-
-        unsigned char pp[9];
-
-        pp[0] = Left[3];
-        pp[1] = Left[2];
-        pp[2] = Left[1];
-        pp[3] = Left[0];
-        pp[4] = top_left;
-        pp[5] = Above[0];
-        pp[6] = Above[1];
-        pp[7] = Above[2];
-        pp[8] = Above[3];
-
-
-        predictor[3 * 16 + 0] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
-        predictor[2 * 16 + 0] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
-        predictor[3 * 16 + 1] =
-            predictor[1 * 16 + 0] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
-        predictor[2 * 16 + 1] =
-            predictor[0 * 16 + 0] = (pp[4] + pp[5] + 1) >> 1;
-        predictor[3 * 16 + 2] =
-            predictor[1 * 16 + 1] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
-        predictor[2 * 16 + 2] =
-            predictor[0 * 16 + 1] = (pp[5] + pp[6] + 1) >> 1;
-        predictor[3 * 16 + 3] =
-            predictor[1 * 16 + 2] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
-        predictor[2 * 16 + 3] =
-            predictor[0 * 16 + 2] = (pp[6] + pp[7] + 1) >> 1;
-        predictor[1 * 16 + 3] = (pp[6] + pp[7] * 2 + pp[8] + 2) >> 2;
-        predictor[0 * 16 + 3] = (pp[7] + pp[8] + 1) >> 1;
-
-    }
-    break;
-    case B_VL_PRED:
-    {
-
-        unsigned char *pp = Above;
-
-        predictor[0 * 16 + 0] = (pp[0] + pp[1] + 1) >> 1;
-        predictor[1 * 16 + 0] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
-        predictor[2 * 16 + 0] =
-            predictor[0 * 16 + 1] = (pp[1] + pp[2] + 1) >> 1;
-        predictor[1 * 16 + 1] =
-            predictor[3 * 16 + 0] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
-        predictor[2 * 16 + 1] =
-            predictor[0 * 16 + 2] = (pp[2] + pp[3] + 1) >> 1;
-        predictor[3 * 16 + 1] =
-            predictor[1 * 16 + 2] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
-        predictor[0 * 16 + 3] =
-            predictor[2 * 16 + 2] = (pp[3] + pp[4] + 1) >> 1;
-        predictor[1 * 16 + 3] =
-            predictor[3 * 16 + 2] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
-        predictor[2 * 16 + 3] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
-        predictor[3 * 16 + 3] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
-    }
-    break;
-
-    case B_HD_PRED:
-    {
-        unsigned char pp[9];
-        pp[0] = Left[3];
-        pp[1] = Left[2];
-        pp[2] = Left[1];
-        pp[3] = Left[0];
-        pp[4] = top_left;
-        pp[5] = Above[0];
-        pp[6] = Above[1];
-        pp[7] = Above[2];
-        pp[8] = Above[3];
-
-
-        predictor[3 * 16 + 0] = (pp[0] + pp[1] + 1) >> 1;
-        predictor[3 * 16 + 1] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
-        predictor[2 * 16 + 0] =
-            predictor[3 * 16 + 2] = (pp[1] + pp[2] + 1) >> 1;
-        predictor[2 * 16 + 1] =
-            predictor[3 * 16 + 3] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
-        predictor[2 * 16 + 2] =
-            predictor[1 * 16 + 0] = (pp[2] + pp[3] + 1) >> 1;
-        predictor[2 * 16 + 3] =
-            predictor[1 * 16 + 1] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
-        predictor[1 * 16 + 2] =
-            predictor[0 * 16 + 0] = (pp[3] + pp[4] + 1) >> 1;
-        predictor[1 * 16 + 3] =
-            predictor[0 * 16 + 1] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
-        predictor[0 * 16 + 2] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
-        predictor[0 * 16 + 3] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
-    }
-    break;
-
-
-    case B_HU_PRED:
-    {
-        unsigned char *pp = Left;
-        predictor[0 * 16 + 0] = (pp[0] + pp[1] + 1) >> 1;
-        predictor[0 * 16 + 1] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
-        predictor[0 * 16 + 2] =
-            predictor[1 * 16 + 0] = (pp[1] + pp[2] + 1) >> 1;
-        predictor[0 * 16 + 3] =
-            predictor[1 * 16 + 1] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
-        predictor[1 * 16 + 2] =
-            predictor[2 * 16 + 0] = (pp[2] + pp[3] + 1) >> 1;
-        predictor[1 * 16 + 3] =
-            predictor[2 * 16 + 1] = (pp[2] + pp[3] * 2 + pp[3] + 2) >> 2;
-        predictor[2 * 16 + 2] =
-            predictor[2 * 16 + 3] =
-                predictor[3 * 16 + 0] =
-                    predictor[3 * 16 + 1] =
-                        predictor[3 * 16 + 2] =
-                            predictor[3 * 16 + 3] = pp[3];
-    }
-    break;
-
-
-    }
-#else
-    (void) pbi;
-    (void) xd;
-    (void) b_mode;
-    (void) predictor;
-    (void) mb_row;
-    (void) mb_col;
-    (void) num;
-#endif
-}
-
-// copy 4 bytes from the above right down so that the 4x4 prediction modes using pixels above and
-// to the right prediction have filled in pixels to use.
-void vp8mt_intra_prediction_down_copy(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
-{
-#if CONFIG_MULTITHREAD
-    unsigned char *above_right;   // = *(x->block[0].base_dst) + x->block[0].dst - x->block[0].dst_stride + 16;
-    unsigned int *src_ptr;
-    unsigned int *dst_ptr0;
-    unsigned int *dst_ptr1;
-    unsigned int *dst_ptr2;
-
-    if (pbi->common.filter_level)
-        above_right = pbi->mt_yabove_row[mb_row] + mb_col*16 + 32 +16;
-    else
-        above_right = *(x->block[0].base_dst) + x->block[0].dst - x->block[0].dst_stride + 16;
-
-    src_ptr = (unsigned int *)above_right;
-    //dst_ptr0 = (unsigned int *)(above_right + 4 * x->block[0].dst_stride);
-    //dst_ptr1 = (unsigned int *)(above_right + 8 * x->block[0].dst_stride);
-    //dst_ptr2 = (unsigned int *)(above_right + 12 * x->block[0].dst_stride);
-    dst_ptr0 = (unsigned int *)(*(x->block[0].base_dst) + x->block[0].dst + 16 + 3 * x->block[0].dst_stride);
-    dst_ptr1 = (unsigned int *)(*(x->block[0].base_dst) + x->block[0].dst + 16 + 7 * x->block[0].dst_stride);
-    dst_ptr2 = (unsigned int *)(*(x->block[0].base_dst) + x->block[0].dst + 16 + 11 * x->block[0].dst_stride);
-    *dst_ptr0 = *src_ptr;
-    *dst_ptr1 = *src_ptr;
-    *dst_ptr2 = *src_ptr;
-#else
-    (void) pbi;
-    (void) x;
-    (void) mb_row;
-    (void) mb_col;
-#endif
-}
--- a/vp8/decoder/onyxd_int.h
+++ b/vp8/decoder/onyxd_int.h
@@ -96,6 +96,7 @@
     // variable for threading
 #if CONFIG_MULTITHREAD
     int mt_baseline_filter_level[MAX_MB_SEGMENTS];
+    int sync_range;
     int *mt_current_mb_col;                  // Each row remembers its already decoded column.
 
     unsigned char **mt_yabove_row;           // mb_rows x width
--- /dev/null
+++ b/vp8/decoder/reconintra_mt.c
@@ -1,0 +1,980 @@
+/*
+ *  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_ports/config.h"
+#include "recon.h"
+#include "reconintra.h"
+#include "vpx_mem/vpx_mem.h"
+#include "onyxd_int.h"
+
+// For skip_recon_mb(), add vp8_build_intra_predictors_mby_s(MACROBLOCKD *x) and
+// vp8_build_intra_predictors_mbuv_s(MACROBLOCKD *x).
+
+void vp8mt_build_intra_predictors_mby(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
+{
+#if CONFIG_MULTITHREAD
+    unsigned char *yabove_row;    // = x->dst.y_buffer - x->dst.y_stride;
+    unsigned char *yleft_col;
+    unsigned char yleft_buf[16];
+    unsigned char ytop_left;      // = yabove_row[-1];
+    unsigned char *ypred_ptr = x->predictor;
+    int r, c, i;
+
+    if (pbi->common.filter_level)
+    {
+        yabove_row = pbi->mt_yabove_row[mb_row] + mb_col*16 +32;
+        yleft_col = pbi->mt_yleft_col[mb_row];
+    } else
+    {
+        yabove_row = x->dst.y_buffer - x->dst.y_stride;
+
+        for (i = 0; i < 16; i++)
+            yleft_buf[i] = x->dst.y_buffer [i* x->dst.y_stride -1];
+        yleft_col = yleft_buf;
+    }
+
+    ytop_left = yabove_row[-1];
+
+    // for Y
+    switch (x->mode_info_context->mbmi.mode)
+    {
+    case DC_PRED:
+    {
+        int expected_dc;
+        int i;
+        int shift;
+        int average = 0;
+
+
+        if (x->up_available || x->left_available)
+        {
+            if (x->up_available)
+            {
+                for (i = 0; i < 16; i++)
+                {
+                    average += yabove_row[i];
+                }
+            }
+
+            if (x->left_available)
+            {
+
+                for (i = 0; i < 16; i++)
+                {
+                    average += yleft_col[i];
+                }
+
+            }
+
+
+
+            shift = 3 + x->up_available + x->left_available;
+            expected_dc = (average + (1 << (shift - 1))) >> shift;
+        }
+        else
+        {
+            expected_dc = 128;
+        }
+
+        vpx_memset(ypred_ptr, expected_dc, 256);
+    }
+    break;
+    case V_PRED:
+    {
+
+        for (r = 0; r < 16; r++)
+        {
+
+            ((int *)ypred_ptr)[0] = ((int *)yabove_row)[0];
+            ((int *)ypred_ptr)[1] = ((int *)yabove_row)[1];
+            ((int *)ypred_ptr)[2] = ((int *)yabove_row)[2];
+            ((int *)ypred_ptr)[3] = ((int *)yabove_row)[3];
+            ypred_ptr += 16;
+        }
+    }
+    break;
+    case H_PRED:
+    {
+
+        for (r = 0; r < 16; r++)
+        {
+
+            vpx_memset(ypred_ptr, yleft_col[r], 16);
+            ypred_ptr += 16;
+        }
+
+    }
+    break;
+    case TM_PRED:
+    {
+
+        for (r = 0; r < 16; r++)
+        {
+            for (c = 0; c < 16; c++)
+            {
+                int pred =  yleft_col[r] + yabove_row[ c] - ytop_left;
+
+                if (pred < 0)
+                    pred = 0;
+
+                if (pred > 255)
+                    pred = 255;
+
+                ypred_ptr[c] = pred;
+            }
+
+            ypred_ptr += 16;
+        }
+
+    }
+    break;
+    case B_PRED:
+    case NEARESTMV:
+    case NEARMV:
+    case ZEROMV:
+    case NEWMV:
+    case SPLITMV:
+    case MB_MODE_COUNT:
+        break;
+    }
+#else
+    (void) pbi;
+    (void) x;
+    (void) mb_row;
+    (void) mb_col;
+#endif
+}
+
+void vp8mt_build_intra_predictors_mby_s(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
+{
+#if CONFIG_MULTITHREAD
+    unsigned char *yabove_row;    // = x->dst.y_buffer - x->dst.y_stride;
+    unsigned char *yleft_col;
+    unsigned char yleft_buf[16];
+    unsigned char ytop_left;      // = yabove_row[-1];
+    unsigned char *ypred_ptr = x->predictor;
+    int r, c, i;
+
+    int y_stride = x->dst.y_stride;
+    ypred_ptr = x->dst.y_buffer; //x->predictor;
+
+    if (pbi->common.filter_level)
+    {
+        yabove_row = pbi->mt_yabove_row[mb_row] + mb_col*16 +32;
+        yleft_col = pbi->mt_yleft_col[mb_row];
+    } else
+    {
+        yabove_row = x->dst.y_buffer - x->dst.y_stride;
+
+        for (i = 0; i < 16; i++)
+            yleft_buf[i] = x->dst.y_buffer [i* x->dst.y_stride -1];
+        yleft_col = yleft_buf;
+    }
+
+    ytop_left = yabove_row[-1];
+
+    // for Y
+    switch (x->mode_info_context->mbmi.mode)
+    {
+    case DC_PRED:
+    {
+        int expected_dc;
+        int i;
+        int shift;
+        int average = 0;
+
+
+        if (x->up_available || x->left_available)
+        {
+            if (x->up_available)
+            {
+                for (i = 0; i < 16; i++)
+                {
+                    average += yabove_row[i];
+                }
+            }
+
+            if (x->left_available)
+            {
+
+                for (i = 0; i < 16; i++)
+                {
+                    average += yleft_col[i];
+                }
+
+            }
+
+
+
+            shift = 3 + x->up_available + x->left_available;
+            expected_dc = (average + (1 << (shift - 1))) >> shift;
+        }
+        else
+        {
+            expected_dc = 128;
+        }
+
+        //vpx_memset(ypred_ptr, expected_dc, 256);
+        for (r = 0; r < 16; r++)
+        {
+            vpx_memset(ypred_ptr, expected_dc, 16);
+            ypred_ptr += y_stride; //16;
+        }
+    }
+    break;
+    case V_PRED:
+    {
+
+        for (r = 0; r < 16; r++)
+        {
+
+            ((int *)ypred_ptr)[0] = ((int *)yabove_row)[0];
+            ((int *)ypred_ptr)[1] = ((int *)yabove_row)[1];
+            ((int *)ypred_ptr)[2] = ((int *)yabove_row)[2];
+            ((int *)ypred_ptr)[3] = ((int *)yabove_row)[3];
+            ypred_ptr += y_stride; //16;
+        }
+    }
+    break;
+    case H_PRED:
+    {
+
+        for (r = 0; r < 16; r++)
+        {
+
+            vpx_memset(ypred_ptr, yleft_col[r], 16);
+            ypred_ptr += y_stride;  //16;
+        }
+
+    }
+    break;
+    case TM_PRED:
+    {
+
+        for (r = 0; r < 16; r++)
+        {
+            for (c = 0; c < 16; c++)
+            {
+                int pred =  yleft_col[r] + yabove_row[ c] - ytop_left;
+
+                if (pred < 0)
+                    pred = 0;
+
+                if (pred > 255)
+                    pred = 255;
+
+                ypred_ptr[c] = pred;
+            }
+
+            ypred_ptr += y_stride;  //16;
+        }
+
+    }
+    break;
+    case B_PRED:
+    case NEARESTMV:
+    case NEARMV:
+    case ZEROMV:
+    case NEWMV:
+    case SPLITMV:
+    case MB_MODE_COUNT:
+        break;
+    }
+#else
+    (void) pbi;
+    (void) x;
+    (void) mb_row;
+    (void) mb_col;
+#endif
+}
+
+void vp8mt_build_intra_predictors_mbuv(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
+{
+#if CONFIG_MULTITHREAD
+    unsigned char *uabove_row;   // = x->dst.u_buffer - x->dst.uv_stride;
+    unsigned char *uleft_col;    //[16];
+    unsigned char uleft_buf[8];
+    unsigned char utop_left;     // = uabove_row[-1];
+    unsigned char *vabove_row;   // = x->dst.v_buffer - x->dst.uv_stride;
+    unsigned char *vleft_col;    //[20];
+    unsigned char vleft_buf[8];
+    unsigned char vtop_left;     // = vabove_row[-1];
+    unsigned char *upred_ptr = &x->predictor[256];
+    unsigned char *vpred_ptr = &x->predictor[320];
+    int i, j;
+
+    if (pbi->common.filter_level)
+    {
+        uabove_row = pbi->mt_uabove_row[mb_row] + mb_col*8 +16;
+        vabove_row = pbi->mt_vabove_row[mb_row] + mb_col*8 +16;
+        uleft_col = pbi->mt_uleft_col[mb_row];
+        vleft_col = pbi->mt_vleft_col[mb_row];
+    } else
+    {
+        uabove_row = x->dst.u_buffer - x->dst.uv_stride;
+        vabove_row = x->dst.v_buffer - x->dst.uv_stride;
+
+        for (i = 0; i < 8; i++)
+        {
+            uleft_buf[i] = x->dst.u_buffer [i* x->dst.uv_stride -1];
+            vleft_buf[i] = x->dst.v_buffer [i* x->dst.uv_stride -1];
+        }
+        uleft_col = uleft_buf;
+        vleft_col = vleft_buf;
+    }
+    utop_left = uabove_row[-1];
+    vtop_left = vabove_row[-1];
+
+    switch (x->mode_info_context->mbmi.uv_mode)
+    {
+    case DC_PRED:
+    {
+        int expected_udc;
+        int expected_vdc;
+        int i;
+        int shift;
+        int Uaverage = 0;
+        int Vaverage = 0;
+
+        if (x->up_available)
+        {
+            for (i = 0; i < 8; i++)
+            {
+                Uaverage += uabove_row[i];
+                Vaverage += vabove_row[i];
+            }
+        }
+
+        if (x->left_available)
+        {
+            for (i = 0; i < 8; i++)
+            {
+                Uaverage += uleft_col[i];
+                Vaverage += vleft_col[i];
+            }
+        }
+
+        if (!x->up_available && !x->left_available)
+        {
+            expected_udc = 128;
+            expected_vdc = 128;
+        }
+        else
+        {
+            shift = 2 + x->up_available + x->left_available;
+            expected_udc = (Uaverage + (1 << (shift - 1))) >> shift;
+            expected_vdc = (Vaverage + (1 << (shift - 1))) >> shift;
+        }
+
+
+        vpx_memset(upred_ptr, expected_udc, 64);
+        vpx_memset(vpred_ptr, expected_vdc, 64);
+
+
+    }
+    break;
+    case V_PRED:
+    {
+        int i;
+
+        for (i = 0; i < 8; i++)
+        {
+            vpx_memcpy(upred_ptr, uabove_row, 8);
+            vpx_memcpy(vpred_ptr, vabove_row, 8);
+            upred_ptr += 8;
+            vpred_ptr += 8;
+        }
+
+    }
+    break;
+    case H_PRED:
+    {
+        int i;
+
+        for (i = 0; i < 8; i++)
+        {
+            vpx_memset(upred_ptr, uleft_col[i], 8);
+            vpx_memset(vpred_ptr, vleft_col[i], 8);
+            upred_ptr += 8;
+            vpred_ptr += 8;
+        }
+    }
+
+    break;
+    case TM_PRED:
+    {
+        int i;
+
+        for (i = 0; i < 8; i++)
+        {
+            for (j = 0; j < 8; j++)
+            {
+                int predu = uleft_col[i] + uabove_row[j] - utop_left;
+                int predv = vleft_col[i] + vabove_row[j] - vtop_left;
+
+                if (predu < 0)
+                    predu = 0;
+
+                if (predu > 255)
+                    predu = 255;
+
+                if (predv < 0)
+                    predv = 0;
+
+                if (predv > 255)
+                    predv = 255;
+
+                upred_ptr[j] = predu;
+                vpred_ptr[j] = predv;
+            }
+
+            upred_ptr += 8;
+            vpred_ptr += 8;
+        }
+
+    }
+    break;
+    case B_PRED:
+    case NEARESTMV:
+    case NEARMV:
+    case ZEROMV:
+    case NEWMV:
+    case SPLITMV:
+    case MB_MODE_COUNT:
+        break;
+    }
+#else
+    (void) pbi;
+    (void) x;
+    (void) mb_row;
+    (void) mb_col;
+#endif
+}
+
+void vp8mt_build_intra_predictors_mbuv_s(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
+{
+#if CONFIG_MULTITHREAD
+    unsigned char *uabove_row;  // = x->dst.u_buffer - x->dst.uv_stride;
+    unsigned char *uleft_col;   //[16];
+    unsigned char uleft_buf[8];
+    unsigned char utop_left;    // = uabove_row[-1];
+    unsigned char *vabove_row;  // = x->dst.v_buffer - x->dst.uv_stride;
+    unsigned char *vleft_col;   //[20];
+    unsigned char vleft_buf[8];
+    unsigned char vtop_left;    // = vabove_row[-1];
+    unsigned char *upred_ptr = x->dst.u_buffer; //&x->predictor[256];
+    unsigned char *vpred_ptr = x->dst.v_buffer; //&x->predictor[320];
+    int uv_stride = x->dst.uv_stride;
+    int i, j;
+
+    if (pbi->common.filter_level)
+    {
+        uabove_row = pbi->mt_uabove_row[mb_row] + mb_col*8 +16;
+        vabove_row = pbi->mt_vabove_row[mb_row] + mb_col*8 +16;
+        uleft_col = pbi->mt_uleft_col[mb_row];
+        vleft_col = pbi->mt_vleft_col[mb_row];
+    } else
+    {
+        uabove_row = x->dst.u_buffer - x->dst.uv_stride;
+        vabove_row = x->dst.v_buffer - x->dst.uv_stride;
+
+        for (i = 0; i < 8; i++)
+        {
+            uleft_buf[i] = x->dst.u_buffer [i* x->dst.uv_stride -1];
+            vleft_buf[i] = x->dst.v_buffer [i* x->dst.uv_stride -1];
+        }
+        uleft_col = uleft_buf;
+        vleft_col = vleft_buf;
+    }
+    utop_left = uabove_row[-1];
+    vtop_left = vabove_row[-1];
+
+    switch (x->mode_info_context->mbmi.uv_mode)
+    {
+    case DC_PRED:
+    {
+        int expected_udc;
+        int expected_vdc;
+        int i;
+        int shift;
+        int Uaverage = 0;
+        int Vaverage = 0;
+
+        if (x->up_available)
+        {
+            for (i = 0; i < 8; i++)
+            {
+                Uaverage += uabove_row[i];
+                Vaverage += vabove_row[i];
+            }
+        }
+
+        if (x->left_available)
+        {
+            for (i = 0; i < 8; i++)
+            {
+                Uaverage += uleft_col[i];
+                Vaverage += vleft_col[i];
+            }
+        }
+
+        if (!x->up_available && !x->left_available)
+        {
+            expected_udc = 128;
+            expected_vdc = 128;
+        }
+        else
+        {
+            shift = 2 + x->up_available + x->left_available;
+            expected_udc = (Uaverage + (1 << (shift - 1))) >> shift;
+            expected_vdc = (Vaverage + (1 << (shift - 1))) >> shift;
+        }
+
+
+        //vpx_memset(upred_ptr,expected_udc,64);
+        //vpx_memset(vpred_ptr,expected_vdc,64);
+        for (i = 0; i < 8; i++)
+        {
+            vpx_memset(upred_ptr, expected_udc, 8);
+            vpx_memset(vpred_ptr, expected_vdc, 8);
+            upred_ptr += uv_stride; //8;
+            vpred_ptr += uv_stride; //8;
+        }
+    }
+    break;
+    case V_PRED:
+    {
+        int i;
+
+        for (i = 0; i < 8; i++)
+        {
+            vpx_memcpy(upred_ptr, uabove_row, 8);
+            vpx_memcpy(vpred_ptr, vabove_row, 8);
+            upred_ptr += uv_stride; //8;
+            vpred_ptr += uv_stride; //8;
+        }
+
+    }
+    break;
+    case H_PRED:
+    {
+        int i;
+
+        for (i = 0; i < 8; i++)
+        {
+            vpx_memset(upred_ptr, uleft_col[i], 8);
+            vpx_memset(vpred_ptr, vleft_col[i], 8);
+            upred_ptr += uv_stride; //8;
+            vpred_ptr += uv_stride; //8;
+        }
+    }
+
+    break;
+    case TM_PRED:
+    {
+        int i;
+
+        for (i = 0; i < 8; i++)
+        {
+            for (j = 0; j < 8; j++)
+            {
+                int predu = uleft_col[i] + uabove_row[j] - utop_left;
+                int predv = vleft_col[i] + vabove_row[j] - vtop_left;
+
+                if (predu < 0)
+                    predu = 0;
+
+                if (predu > 255)
+                    predu = 255;
+
+                if (predv < 0)
+                    predv = 0;
+
+                if (predv > 255)
+                    predv = 255;
+
+                upred_ptr[j] = predu;
+                vpred_ptr[j] = predv;
+            }
+
+            upred_ptr += uv_stride; //8;
+            vpred_ptr += uv_stride; //8;
+        }
+
+    }
+    break;
+    case B_PRED:
+    case NEARESTMV:
+    case NEARMV:
+    case ZEROMV:
+    case NEWMV:
+    case SPLITMV:
+    case MB_MODE_COUNT:
+        break;
+    }
+#else
+    (void) pbi;
+    (void) x;
+    (void) mb_row;
+    (void) mb_col;
+#endif
+}
+
+
+void vp8mt_predict_intra4x4(VP8D_COMP *pbi,
+                          MACROBLOCKD *xd,
+                          int b_mode,
+                          unsigned char *predictor,
+                          int mb_row,
+                          int mb_col,
+                          int num)
+{
+#if CONFIG_MULTITHREAD
+    int i, r, c;
+
+    unsigned char *Above;   // = *(x->base_dst) + x->dst - x->dst_stride;
+    unsigned char Left[4];
+    unsigned char top_left; // = Above[-1];
+
+    BLOCKD *x = &xd->block[num];
+
+    //Caution: For some b_mode, it needs 8 pixels (4 above + 4 above-right).
+    if (num < 4 && pbi->common.filter_level)
+        Above = pbi->mt_yabove_row[mb_row] + mb_col*16 + num*4 + 32;
+    else
+        Above = *(x->base_dst) + x->dst - x->dst_stride;
+
+    if (num%4==0 && pbi->common.filter_level)
+    {
+        for (i=0; i<4; i++)
+            Left[i] = pbi->mt_yleft_col[mb_row][num + i];
+    }else
+    {
+        Left[0] = (*(x->base_dst))[x->dst - 1];
+        Left[1] = (*(x->base_dst))[x->dst - 1 + x->dst_stride];
+        Left[2] = (*(x->base_dst))[x->dst - 1 + 2 * x->dst_stride];
+        Left[3] = (*(x->base_dst))[x->dst - 1 + 3 * x->dst_stride];
+    }
+
+    if ((num==4 || num==8 || num==12) && pbi->common.filter_level)
+        top_left = pbi->mt_yleft_col[mb_row][num-1];
+    else
+        top_left = Above[-1];
+
+     switch (b_mode)
+    {
+    case B_DC_PRED:
+    {
+        int expected_dc = 0;
+
+        for (i = 0; i < 4; i++)
+        {
+            expected_dc += Above[i];
+            expected_dc += Left[i];
+        }
+
+        expected_dc = (expected_dc + 4) >> 3;
+
+        for (r = 0; r < 4; r++)
+        {
+            for (c = 0; c < 4; c++)
+            {
+                predictor[c] = expected_dc;
+            }
+
+            predictor += 16;
+        }
+    }
+    break;
+    case B_TM_PRED:
+    {
+        // prediction similar to true_motion prediction
+        for (r = 0; r < 4; r++)
+        {
+            for (c = 0; c < 4; c++)
+            {
+                int pred = Above[c] - top_left + Left[r];
+
+                if (pred < 0)
+                    pred = 0;
+
+                if (pred > 255)
+                    pred = 255;
+
+                predictor[c] = pred;
+            }
+
+            predictor += 16;
+        }
+    }
+    break;
+
+    case B_VE_PRED:
+    {
+
+        unsigned int ap[4];
+        ap[0] = (top_left  + 2 * Above[0] + Above[1] + 2) >> 2;
+        ap[1] = (Above[0] + 2 * Above[1] + Above[2] + 2) >> 2;
+        ap[2] = (Above[1] + 2 * Above[2] + Above[3] + 2) >> 2;
+        ap[3] = (Above[2] + 2 * Above[3] + Above[4] + 2) >> 2;
+
+        for (r = 0; r < 4; r++)
+        {
+            for (c = 0; c < 4; c++)
+            {
+
+                predictor[c] = ap[c];
+            }
+
+            predictor += 16;
+        }
+
+    }
+    break;
+
+
+    case B_HE_PRED:
+    {
+
+        unsigned int lp[4];
+        lp[0] = (top_left + 2 * Left[0] + Left[1] + 2) >> 2;
+        lp[1] = (Left[0] + 2 * Left[1] + Left[2] + 2) >> 2;
+        lp[2] = (Left[1] + 2 * Left[2] + Left[3] + 2) >> 2;
+        lp[3] = (Left[2] + 2 * Left[3] + Left[3] + 2) >> 2;
+
+        for (r = 0; r < 4; r++)
+        {
+            for (c = 0; c < 4; c++)
+            {
+                predictor[c] = lp[r];
+            }
+
+            predictor += 16;
+        }
+    }
+    break;
+    case B_LD_PRED:
+    {
+        unsigned char *ptr = Above;
+        predictor[0 * 16 + 0] = (ptr[0] + ptr[1] * 2 + ptr[2] + 2) >> 2;
+        predictor[0 * 16 + 1] =
+            predictor[1 * 16 + 0] = (ptr[1] + ptr[2] * 2 + ptr[3] + 2) >> 2;
+        predictor[0 * 16 + 2] =
+            predictor[1 * 16 + 1] =
+                predictor[2 * 16 + 0] = (ptr[2] + ptr[3] * 2 + ptr[4] + 2) >> 2;
+        predictor[0 * 16 + 3] =
+            predictor[1 * 16 + 2] =
+                predictor[2 * 16 + 1] =
+                    predictor[3 * 16 + 0] = (ptr[3] + ptr[4] * 2 + ptr[5] + 2) >> 2;
+        predictor[1 * 16 + 3] =
+            predictor[2 * 16 + 2] =
+                predictor[3 * 16 + 1] = (ptr[4] + ptr[5] * 2 + ptr[6] + 2) >> 2;
+        predictor[2 * 16 + 3] =
+            predictor[3 * 16 + 2] = (ptr[5] + ptr[6] * 2 + ptr[7] + 2) >> 2;
+        predictor[3 * 16 + 3] = (ptr[6] + ptr[7] * 2 + ptr[7] + 2) >> 2;
+
+    }
+    break;
+    case B_RD_PRED:
+    {
+
+        unsigned char pp[9];
+
+        pp[0] = Left[3];
+        pp[1] = Left[2];
+        pp[2] = Left[1];
+        pp[3] = Left[0];
+        pp[4] = top_left;
+        pp[5] = Above[0];
+        pp[6] = Above[1];
+        pp[7] = Above[2];
+        pp[8] = Above[3];
+
+        predictor[3 * 16 + 0] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
+        predictor[3 * 16 + 1] =
+            predictor[2 * 16 + 0] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
+        predictor[3 * 16 + 2] =
+            predictor[2 * 16 + 1] =
+                predictor[1 * 16 + 0] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
+        predictor[3 * 16 + 3] =
+            predictor[2 * 16 + 2] =
+                predictor[1 * 16 + 1] =
+                    predictor[0 * 16 + 0] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
+        predictor[2 * 16 + 3] =
+            predictor[1 * 16 + 2] =
+                predictor[0 * 16 + 1] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
+        predictor[1 * 16 + 3] =
+            predictor[0 * 16 + 2] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
+        predictor[0 * 16 + 3] = (pp[6] + pp[7] * 2 + pp[8] + 2) >> 2;
+
+    }
+    break;
+    case B_VR_PRED:
+    {
+
+        unsigned char pp[9];
+
+        pp[0] = Left[3];
+        pp[1] = Left[2];
+        pp[2] = Left[1];
+        pp[3] = Left[0];
+        pp[4] = top_left;
+        pp[5] = Above[0];
+        pp[6] = Above[1];
+        pp[7] = Above[2];
+        pp[8] = Above[3];
+
+
+        predictor[3 * 16 + 0] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
+        predictor[2 * 16 + 0] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
+        predictor[3 * 16 + 1] =
+            predictor[1 * 16 + 0] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
+        predictor[2 * 16 + 1] =
+            predictor[0 * 16 + 0] = (pp[4] + pp[5] + 1) >> 1;
+        predictor[3 * 16 + 2] =
+            predictor[1 * 16 + 1] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
+        predictor[2 * 16 + 2] =
+            predictor[0 * 16 + 1] = (pp[5] + pp[6] + 1) >> 1;
+        predictor[3 * 16 + 3] =
+            predictor[1 * 16 + 2] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
+        predictor[2 * 16 + 3] =
+            predictor[0 * 16 + 2] = (pp[6] + pp[7] + 1) >> 1;
+        predictor[1 * 16 + 3] = (pp[6] + pp[7] * 2 + pp[8] + 2) >> 2;
+        predictor[0 * 16 + 3] = (pp[7] + pp[8] + 1) >> 1;
+
+    }
+    break;
+    case B_VL_PRED:
+    {
+
+        unsigned char *pp = Above;
+
+        predictor[0 * 16 + 0] = (pp[0] + pp[1] + 1) >> 1;
+        predictor[1 * 16 + 0] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
+        predictor[2 * 16 + 0] =
+            predictor[0 * 16 + 1] = (pp[1] + pp[2] + 1) >> 1;
+        predictor[1 * 16 + 1] =
+            predictor[3 * 16 + 0] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
+        predictor[2 * 16 + 1] =
+            predictor[0 * 16 + 2] = (pp[2] + pp[3] + 1) >> 1;
+        predictor[3 * 16 + 1] =
+            predictor[1 * 16 + 2] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
+        predictor[0 * 16 + 3] =
+            predictor[2 * 16 + 2] = (pp[3] + pp[4] + 1) >> 1;
+        predictor[1 * 16 + 3] =
+            predictor[3 * 16 + 2] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
+        predictor[2 * 16 + 3] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
+        predictor[3 * 16 + 3] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
+    }
+    break;
+
+    case B_HD_PRED:
+    {
+        unsigned char pp[9];
+        pp[0] = Left[3];
+        pp[1] = Left[2];
+        pp[2] = Left[1];
+        pp[3] = Left[0];
+        pp[4] = top_left;
+        pp[5] = Above[0];
+        pp[6] = Above[1];
+        pp[7] = Above[2];
+        pp[8] = Above[3];
+
+
+        predictor[3 * 16 + 0] = (pp[0] + pp[1] + 1) >> 1;
+        predictor[3 * 16 + 1] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
+        predictor[2 * 16 + 0] =
+            predictor[3 * 16 + 2] = (pp[1] + pp[2] + 1) >> 1;
+        predictor[2 * 16 + 1] =
+            predictor[3 * 16 + 3] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
+        predictor[2 * 16 + 2] =
+            predictor[1 * 16 + 0] = (pp[2] + pp[3] + 1) >> 1;
+        predictor[2 * 16 + 3] =
+            predictor[1 * 16 + 1] = (pp[2] + pp[3] * 2 + pp[4] + 2) >> 2;
+        predictor[1 * 16 + 2] =
+            predictor[0 * 16 + 0] = (pp[3] + pp[4] + 1) >> 1;
+        predictor[1 * 16 + 3] =
+            predictor[0 * 16 + 1] = (pp[3] + pp[4] * 2 + pp[5] + 2) >> 2;
+        predictor[0 * 16 + 2] = (pp[4] + pp[5] * 2 + pp[6] + 2) >> 2;
+        predictor[0 * 16 + 3] = (pp[5] + pp[6] * 2 + pp[7] + 2) >> 2;
+    }
+    break;
+
+
+    case B_HU_PRED:
+    {
+        unsigned char *pp = Left;
+        predictor[0 * 16 + 0] = (pp[0] + pp[1] + 1) >> 1;
+        predictor[0 * 16 + 1] = (pp[0] + pp[1] * 2 + pp[2] + 2) >> 2;
+        predictor[0 * 16 + 2] =
+            predictor[1 * 16 + 0] = (pp[1] + pp[2] + 1) >> 1;
+        predictor[0 * 16 + 3] =
+            predictor[1 * 16 + 1] = (pp[1] + pp[2] * 2 + pp[3] + 2) >> 2;
+        predictor[1 * 16 + 2] =
+            predictor[2 * 16 + 0] = (pp[2] + pp[3] + 1) >> 1;
+        predictor[1 * 16 + 3] =
+            predictor[2 * 16 + 1] = (pp[2] + pp[3] * 2 + pp[3] + 2) >> 2;
+        predictor[2 * 16 + 2] =
+            predictor[2 * 16 + 3] =
+                predictor[3 * 16 + 0] =
+                    predictor[3 * 16 + 1] =
+                        predictor[3 * 16 + 2] =
+                            predictor[3 * 16 + 3] = pp[3];
+    }
+    break;
+
+
+    }
+#else
+    (void) pbi;
+    (void) xd;
+    (void) b_mode;
+    (void) predictor;
+    (void) mb_row;
+    (void) mb_col;
+    (void) num;
+#endif
+}
+
+// copy 4 bytes from the above right down so that the 4x4 prediction modes using pixels above and
+// to the right prediction have filled in pixels to use.
+void vp8mt_intra_prediction_down_copy(VP8D_COMP *pbi, MACROBLOCKD *x, int mb_row, int mb_col)
+{
+#if CONFIG_MULTITHREAD
+    unsigned char *above_right;   // = *(x->block[0].base_dst) + x->block[0].dst - x->block[0].dst_stride + 16;
+    unsigned int *src_ptr;
+    unsigned int *dst_ptr0;
+    unsigned int *dst_ptr1;
+    unsigned int *dst_ptr2;
+
+    if (pbi->common.filter_level)
+        above_right = pbi->mt_yabove_row[mb_row] + mb_col*16 + 32 +16;
+    else
+        above_right = *(x->block[0].base_dst) + x->block[0].dst - x->block[0].dst_stride + 16;
+
+    src_ptr = (unsigned int *)above_right;
+    //dst_ptr0 = (unsigned int *)(above_right + 4 * x->block[0].dst_stride);
+    //dst_ptr1 = (unsigned int *)(above_right + 8 * x->block[0].dst_stride);
+    //dst_ptr2 = (unsigned int *)(above_right + 12 * x->block[0].dst_stride);
+    dst_ptr0 = (unsigned int *)(*(x->block[0].base_dst) + x->block[0].dst + 16 + 3 * x->block[0].dst_stride);
+    dst_ptr1 = (unsigned int *)(*(x->block[0].base_dst) + x->block[0].dst + 16 + 7 * x->block[0].dst_stride);
+    dst_ptr2 = (unsigned int *)(*(x->block[0].base_dst) + x->block[0].dst + 16 + 11 * x->block[0].dst_stride);
+    *dst_ptr0 = *src_ptr;
+    *dst_ptr1 = *src_ptr;
+    *dst_ptr2 = *src_ptr;
+#else
+    (void) pbi;
+    (void) x;
+    (void) mb_row;
+    (void) mb_col;
+#endif
+}
--- a/vp8/decoder/threading.c
+++ b/vp8/decoder/threading.c
@@ -257,6 +257,7 @@
                 int mb_row;
                 int num_part = 1 << pbi->common.multi_token_partition;
                 volatile int *last_row_current_mb_col;
+                int nsync = pbi->sync_range;
 
                 for (mb_row = ithread+1; mb_row < pc->mb_rows; mb_row += (pbi->decoding_thread_count + 1))
                 {
@@ -292,9 +293,9 @@
 
                     for (mb_col = 0; mb_col < pc->mb_cols; mb_col++)
                     {
-                        if ((mb_col & 7) == 0)
+                        if ((mb_col & (nsync-1)) == 0)
                         {
-                            while (mb_col > (*last_row_current_mb_col - 8) && *last_row_current_mb_col != pc->mb_cols - 1)
+                            while (mb_col > (*last_row_current_mb_col - nsync) && *last_row_current_mb_col != pc->mb_cols - 1)
                             {
                                 x86_pause_hint();
                                 thread_sleep(0);
@@ -608,6 +609,11 @@
         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.
@@ -764,6 +770,7 @@
     int num_part = 1 << pbi->common.multi_token_partition;
     int i, j;
     volatile int *last_row_current_mb_col = NULL;
+    int nsync = pbi->sync_range;
 
     int filter_level;
     loop_filter_info *lfi = pc->lf_info;
@@ -832,8 +839,8 @@
 
             for (mb_col = 0; mb_col < pc->mb_cols; mb_col++)
             {
-                if ( mb_row > 0 && (mb_col & 7) == 0){
-                    while (mb_col > (*last_row_current_mb_col - 8) && *last_row_current_mb_col != pc->mb_cols - 1)
+                if ( mb_row > 0 && (mb_col & (nsync-1)) == 0){
+                    while (mb_col > (*last_row_current_mb_col - nsync) && *last_row_current_mb_col != pc->mb_cols - 1)
                     {
                         x86_pause_hint();
                         thread_sleep(0);
--- a/vp8/exports_dec
+++ b/vp8/exports_dec
@@ -1,1 +1,2 @@
 data vpx_codec_vp8_dx_algo
+text vpx_codec_vp8_dx
--- a/vp8/exports_enc
+++ b/vp8/exports_enc
@@ -1,1 +1,2 @@
 data vpx_codec_vp8_cx_algo
+text vpx_codec_vp8_cx
--- a/vp8/vp8_common.mk
+++ b/vp8/vp8_common.mk
@@ -81,8 +81,6 @@
 VP8_COMMON_SRCS-yes += common/reconinter.c
 VP8_COMMON_SRCS-yes += common/reconintra.c
 VP8_COMMON_SRCS-yes += common/reconintra4x4.c
-VP8_COMMON_SRCS-yes += common/reconintra_mt.h
-VP8_COMMON_SRCS-yes += common/reconintra_mt.c
 VP8_COMMON_SRCS-yes += common/setupintrarecon.c
 VP8_COMMON_SRCS-yes += common/swapyv12buffer.c
 VP8_COMMON_SRCS-yes += common/textblit.c
--- a/vp8/vp8_cx_iface.c
+++ b/vp8/vp8_cx_iface.c
@@ -1100,7 +1100,7 @@
 #ifndef VERSION_STRING
 #define VERSION_STRING
 #endif
-vpx_codec_iface_t vpx_codec_vp8_cx_algo =
+CODEC_INTERFACE(vpx_codec_vp8_cx) =
 {
     "WebM Project VP8 Encoder" VERSION_STRING,
     VPX_CODEC_INTERNAL_ABI_VERSION,
--- a/vp8/vp8_dx_iface.c
+++ b/vp8/vp8_dx_iface.c
@@ -653,7 +653,7 @@
 #ifndef VERSION_STRING
 #define VERSION_STRING
 #endif
-vpx_codec_iface_t vpx_codec_vp8_dx_algo =
+CODEC_INTERFACE(vpx_codec_vp8_dx) =
 {
     "WebM Project VP8 Decoder" VERSION_STRING,
     VPX_CODEC_INTERNAL_ABI_VERSION,
--- a/vp8/vp8dx.mk
+++ b/vp8/vp8dx.mk
@@ -67,6 +67,8 @@
 VP8_DX_SRCS-yes += decoder/onyxd_if.c
 VP8_DX_SRCS-yes += decoder/threading.c
 VP8_DX_SRCS-yes += decoder/idct_blk.c
+VP8_DX_SRCS-$(CONFIG_MULTITHREAD) += decoder/reconintra_mt.h
+VP8_DX_SRCS-$(CONFIG_MULTITHREAD) += decoder/reconintra_mt.c
 
 VP8_DX_SRCS-yes := $(filter-out $(VP8_DX_SRCS_REMOVE-yes),$(VP8_DX_SRCS-yes))
 
--- a/vpx/internal/vpx_codec_internal.h
+++ b/vpx/internal/vpx_codec_internal.h
@@ -389,6 +389,20 @@
 #define RECAST(id, x) id##__convert(x)
 
 
+/* CODEC_INTERFACE convenience macro
+ *
+ * By convention, each codec interface is a struct with extern linkage, where
+ * the symbol is suffixed with _algo. A getter function is also defined to
+ * return a pointer to the struct, since in some cases it's easier to work
+ * with text symbols than data symbols (see issue #169). This function has
+ * the same name as the struct, less the _algo suffix. The CODEC_INTERFACE
+ * macro is provided to define this getter function automatically.
+ */
+#define CODEC_INTERFACE(id)\
+vpx_codec_iface_t* id(void) { return &id##_algo; }\
+vpx_codec_iface_t  id##_algo
+
+
 /* Internal Utility Functions
  *
  * The following functions are indended to be used inside algorithms as
--- a/vpx/vp8cx.h
+++ b/vpx/vp8cx.h
@@ -29,7 +29,8 @@
  * This interface provides the capability to encode raw VP8 streams, as would
  * be found in AVI files.
  */
-extern vpx_codec_iface_t vpx_codec_vp8_cx_algo;
+extern vpx_codec_iface_t  vpx_codec_vp8_cx_algo;
+extern vpx_codec_iface_t* vpx_codec_vp8_cx(void);
 
 
 #if CONFIG_EXPERIMENTAL
--- a/vpx/vp8dx.h
+++ b/vpx/vp8dx.h
@@ -29,7 +29,8 @@
  * This interface provides the capability to decode raw VP8 streams, as would
  * be found in AVI files and other non-Flash uses.
  */
-extern vpx_codec_iface_t vpx_codec_vp8_dx_algo;
+extern vpx_codec_iface_t  vpx_codec_vp8_dx_algo;
+extern vpx_codec_iface_t* vpx_codec_vp8_dx(void);
 
 /* Include controls common to both the encoder and decoder */
 #include "vp8.h"
--