decodframe.c 48.9 KB
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/*
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 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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 *
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 *  Use of this source code is governed by a BSD-style license
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 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
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 *  in the file PATENTS.  All contributing project authors may
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 *  be found in the AUTHORS file in the root of the source tree.
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 */


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#include "vpx_config.h"
#include "vpx_rtcd.h"
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#include "onyxd_int.h"
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#include "vp8/common/header.h"
#include "vp8/common/reconintra4x4.h"
#include "vp8/common/reconinter.h"
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#include "detokenize.h"
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#include "vp8/common/invtrans.h"
#include "vp8/common/alloccommon.h"
#include "vp8/common/entropymode.h"
#include "vp8/common/quant_common.h"
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#include "vpx_scale/vpxscale.h"
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#include "vp8/common/setupintrarecon.h"
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#include "decodemv.h"
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#include "vp8/common/extend.h"
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#if CONFIG_ERROR_CONCEALMENT
#include "error_concealment.h"
#endif
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#include "vpx_mem/vpx_mem.h"
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#include "vp8/common/threading.h"
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#include "decoderthreading.h"
#include "dboolhuff.h"

#include <assert.h>
#include <stdio.h>

void vp8cx_init_de_quantizer(VP8D_COMP *pbi)
{
    int Q;
    VP8_COMMON *const pc = & pbi->common;

    for (Q = 0; Q < QINDEX_RANGE; Q++)
    {
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        pc->Y1dequant[Q][0] = (short)vp8_dc_quant(Q, pc->y1dc_delta_q);
        pc->Y2dequant[Q][0] = (short)vp8_dc2quant(Q, pc->y2dc_delta_q);
        pc->UVdequant[Q][0] = (short)vp8_dc_uv_quant(Q, pc->uvdc_delta_q);
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        pc->Y1dequant[Q][1] = (short)vp8_ac_yquant(Q);
        pc->Y2dequant[Q][1] = (short)vp8_ac2quant(Q, pc->y2ac_delta_q);
        pc->UVdequant[Q][1] = (short)vp8_ac_uv_quant(Q, pc->uvac_delta_q);
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    }
}

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void vp8_mb_init_dequantizer(VP8D_COMP *pbi, MACROBLOCKD *xd)
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{
    int i;
    int QIndex;
    MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;
    VP8_COMMON *const pc = & pbi->common;

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    /* Decide whether to use the default or alternate baseline Q value. */
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    if (xd->segmentation_enabled)
    {
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        /* Abs Value */
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        if (xd->mb_segement_abs_delta == SEGMENT_ABSDATA)
            QIndex = xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];

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        /* Delta Value */
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        else
        {
            QIndex = pc->base_qindex + xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];
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            QIndex = (QIndex >= 0) ? ((QIndex <= MAXQ) ? QIndex : MAXQ) : 0;    /* Clamp to valid range */
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        }
    }
    else
        QIndex = pc->base_qindex;

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    /* Set up the macroblock dequant constants */
    xd->dequant_y1_dc[0] = 1;
    xd->dequant_y1[0] = pc->Y1dequant[QIndex][0];
    xd->dequant_y2[0] = pc->Y2dequant[QIndex][0];
    xd->dequant_uv[0] = pc->UVdequant[QIndex][0];
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    for (i = 1; i < 16; i++)
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    {
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        xd->dequant_y1_dc[i] =
        xd->dequant_y1[i] = pc->Y1dequant[QIndex][1];
        xd->dequant_y2[i] = pc->Y2dequant[QIndex][1];
        xd->dequant_uv[i] = pc->UVdequant[QIndex][1];
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    }
}

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static void decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
                              unsigned int mb_idx)
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{
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    MB_PREDICTION_MODE mode;
    int i;
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#if CONFIG_ERROR_CONCEALMENT
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    int corruption_detected = 0;
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#endif
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    if (xd->mode_info_context->mbmi.mb_skip_coeff)
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    {
        vp8_reset_mb_tokens_context(xd);
    }
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    else if (!vp8dx_bool_error(xd->current_bc))
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    {
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        int eobtotal;
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        eobtotal = vp8_decode_mb_tokens(pbi, xd);
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        /* Special case:  Force the loopfilter to skip when eobtotal is zero */
        xd->mode_info_context->mbmi.mb_skip_coeff = (eobtotal==0);
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    }

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    mode = xd->mode_info_context->mbmi.mode;

    if (xd->segmentation_enabled)
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        vp8_mb_init_dequantizer(pbi, xd);
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#if CONFIG_ERROR_CONCEALMENT
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    if(pbi->ec_active)
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    {
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        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));
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        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;
            vpx_memset(xd->qcoeff, 0, sizeof(xd->qcoeff));
            vp8_conceal_corrupt_mb(xd);


            corruption_detected = 1;

            /* force idct to be skipped for B_PRED and use the
             * prediction only for reconstruction
             * */
            vpx_memset(xd->eobs, 0, 25);
        }
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    }
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#endif
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    /* do prediction */
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    if (xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME)
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    {
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        vp8_build_intra_predictors_mbuv_s(xd,
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                                          xd->recon_above[1],
                                          xd->recon_above[2],
                                          xd->recon_left[1],
                                          xd->recon_left[2],
                                          xd->recon_left_stride[1],
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                                          xd->dst.u_buffer, xd->dst.v_buffer,
                                          xd->dst.uv_stride);
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        if (mode != B_PRED)
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        {
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            vp8_build_intra_predictors_mby_s(xd,
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                                                 xd->recon_above[0],
                                                 xd->recon_left[0],
                                                 xd->recon_left_stride[0],
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                                                 xd->dst.y_buffer,
                                                 xd->dst.y_stride);
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        }
        else
        {
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            short *DQC = xd->dequant_y1;
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            int dst_stride = xd->dst.y_stride;
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            /* clear out residual eob info */
            if(xd->mode_info_context->mbmi.mb_skip_coeff)
                vpx_memset(xd->eobs, 0, 25);

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            intra_prediction_down_copy(xd, xd->recon_above[0] + 16);
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            for (i = 0; i < 16; i++)
            {
                BLOCKD *b = &xd->block[i];
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                unsigned char *dst = xd->dst.y_buffer + b->offset;
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                B_PREDICTION_MODE b_mode =
                    xd->mode_info_context->bmi[i].as_mode;
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                unsigned char *Above = dst - dst_stride;
                unsigned char *yleft = dst - 1;
                int left_stride = dst_stride;
                unsigned char top_left = Above[-1];
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                vp8_intra4x4_predict(Above, yleft, left_stride, b_mode,
                                     dst, dst_stride, top_left);
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                if (xd->eobs[i])
                {
                    if (xd->eobs[i] > 1)
                    {
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                    vp8_dequant_idct_add(b->qcoeff, DQC, dst, dst_stride);
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                    }
                    else
                    {
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                        vp8_dc_only_idct_add
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                            (b->qcoeff[0] * DQC[0],
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                                dst, dst_stride,
                                dst, dst_stride);
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                        ((int *)b->qcoeff)[0] = 0;
                    }
                }
            }
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        }
    }
    else
    {
        vp8_build_inter_predictors_mb(xd);
    }
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#if CONFIG_ERROR_CONCEALMENT
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    if (corruption_detected)
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    {
        return;
    }
#endif

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    if(!xd->mode_info_context->mbmi.mb_skip_coeff)
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    {
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        /* dequantization and idct */
        if (mode != B_PRED)
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        {
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            short *DQC = xd->dequant_y1;
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            if (mode != SPLITMV)
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            {
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                BLOCKD *b = &xd->block[24];

                /* do 2nd order transform on the dc block */
                if (xd->eobs[24] > 1)
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                {
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                    vp8_dequantize_b(b, xd->dequant_y2);
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                    vp8_short_inv_walsh4x4(&b->dqcoeff[0],
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                        xd->qcoeff);
                    ((int *)b->qcoeff)[0] = 0;
                    ((int *)b->qcoeff)[1] = 0;
                    ((int *)b->qcoeff)[2] = 0;
                    ((int *)b->qcoeff)[3] = 0;
                    ((int *)b->qcoeff)[4] = 0;
                    ((int *)b->qcoeff)[5] = 0;
                    ((int *)b->qcoeff)[6] = 0;
                    ((int *)b->qcoeff)[7] = 0;
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                }
                else
                {
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                    b->dqcoeff[0] = b->qcoeff[0] * xd->dequant_y2[0];
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                    vp8_short_inv_walsh4x4_1(&b->dqcoeff[0],
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                        xd->qcoeff);
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                    ((int *)b->qcoeff)[0] = 0;
                }
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                /* override the dc dequant constant in order to preserve the
                 * dc components
                 */
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                DQC = xd->dequant_y1_dc;
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            }

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            vp8_dequant_idct_add_y_block
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                            (xd->qcoeff, DQC,
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                             xd->dst.y_buffer,
                             xd->dst.y_stride, xd->eobs);
        }
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        vp8_dequant_idct_add_uv_block
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                        (xd->qcoeff+16*16, xd->dequant_uv,
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                         xd->dst.u_buffer, xd->dst.v_buffer,
                         xd->dst.uv_stride, xd->eobs+16);
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    }
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}

static int get_delta_q(vp8_reader *bc, int prev, int *q_update)
{
    int ret_val = 0;

    if (vp8_read_bit(bc))
    {
        ret_val = vp8_read_literal(bc, 4);

        if (vp8_read_bit(bc))
            ret_val = -ret_val;
    }

    /* Trigger a quantizer update if the delta-q value has changed */
    if (ret_val != prev)
        *q_update = 1;

    return ret_val;
}

#ifdef PACKET_TESTING
#include <stdio.h>
FILE *vpxlog = 0;
#endif

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static void yv12_extend_frame_top_c(YV12_BUFFER_CONFIG *ybf)
{
    int i;
    unsigned char *src_ptr1;
    unsigned char *dest_ptr1;

    unsigned int Border;
    int plane_stride;

    /***********/
    /* Y Plane */
    /***********/
    Border = ybf->border;
    plane_stride = ybf->y_stride;
    src_ptr1 = ybf->y_buffer - Border;
    dest_ptr1 = src_ptr1 - (Border * plane_stride);

    for (i = 0; i < (int)Border; i++)
    {
        vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
        dest_ptr1 += plane_stride;
    }


    /***********/
    /* U Plane */
    /***********/
    plane_stride = ybf->uv_stride;
    Border /= 2;
    src_ptr1 = ybf->u_buffer - Border;
    dest_ptr1 = src_ptr1 - (Border * plane_stride);

    for (i = 0; i < (int)(Border); i++)
    {
        vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
        dest_ptr1 += plane_stride;
    }

    /***********/
    /* V Plane */
    /***********/

    src_ptr1 = ybf->v_buffer - Border;
    dest_ptr1 = src_ptr1 - (Border * plane_stride);

    for (i = 0; i < (int)(Border); i++)
    {
        vpx_memcpy(dest_ptr1, src_ptr1, plane_stride);
        dest_ptr1 += plane_stride;
    }
}

static void yv12_extend_frame_bottom_c(YV12_BUFFER_CONFIG *ybf)
{
    int i;
    unsigned char *src_ptr1, *src_ptr2;
    unsigned char *dest_ptr2;

    unsigned int Border;
    int plane_stride;
    int plane_height;

    /***********/
    /* Y Plane */
    /***********/
    Border = ybf->border;
    plane_stride = ybf->y_stride;
    plane_height = ybf->y_height;

    src_ptr1 = ybf->y_buffer - Border;
    src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
    dest_ptr2 = src_ptr2 + plane_stride;

    for (i = 0; i < (int)Border; i++)
    {
        vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
        dest_ptr2 += plane_stride;
    }


    /***********/
    /* U Plane */
    /***********/
    plane_stride = ybf->uv_stride;
    plane_height = ybf->uv_height;
    Border /= 2;

    src_ptr1 = ybf->u_buffer - Border;
    src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
    dest_ptr2 = src_ptr2 + plane_stride;

    for (i = 0; i < (int)(Border); i++)
    {
        vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
        dest_ptr2 += plane_stride;
    }

    /***********/
    /* V Plane */
    /***********/

    src_ptr1 = ybf->v_buffer - Border;
    src_ptr2 = src_ptr1 + (plane_height * plane_stride) - plane_stride;
    dest_ptr2 = src_ptr2 + plane_stride;

    for (i = 0; i < (int)(Border); i++)
    {
        vpx_memcpy(dest_ptr2, src_ptr2, plane_stride);
        dest_ptr2 += plane_stride;
    }
}

static void yv12_extend_frame_left_right_c(YV12_BUFFER_CONFIG *ybf,
                                           unsigned char *y_src,
                                           unsigned char *u_src,
                                           unsigned char *v_src)
{
    int i;
    unsigned char *src_ptr1, *src_ptr2;
    unsigned char *dest_ptr1, *dest_ptr2;

    unsigned int Border;
    int plane_stride;
    int plane_height;
    int plane_width;

    /***********/
    /* Y Plane */
    /***********/
    Border = ybf->border;
    plane_stride = ybf->y_stride;
    plane_height = 16;
    plane_width = ybf->y_width;

    /* copy the left and right most columns out */
    src_ptr1 = y_src;
    src_ptr2 = src_ptr1 + plane_width - 1;
    dest_ptr1 = src_ptr1 - Border;
    dest_ptr2 = src_ptr2 + 1;

    for (i = 0; i < plane_height; i++)
    {
        vpx_memset(dest_ptr1, src_ptr1[0], Border);
        vpx_memset(dest_ptr2, src_ptr2[0], Border);
        src_ptr1  += plane_stride;
        src_ptr2  += plane_stride;
        dest_ptr1 += plane_stride;
        dest_ptr2 += plane_stride;
    }

    /***********/
    /* U Plane */
    /***********/
    plane_stride = ybf->uv_stride;
    plane_height = 8;
    plane_width = ybf->uv_width;
    Border /= 2;

    /* copy the left and right most columns out */
    src_ptr1 = u_src;
    src_ptr2 = src_ptr1 + plane_width - 1;
    dest_ptr1 = src_ptr1 - Border;
    dest_ptr2 = src_ptr2 + 1;

    for (i = 0; i < plane_height; i++)
    {
        vpx_memset(dest_ptr1, src_ptr1[0], Border);
        vpx_memset(dest_ptr2, src_ptr2[0], Border);
        src_ptr1  += plane_stride;
        src_ptr2  += plane_stride;
        dest_ptr1 += plane_stride;
        dest_ptr2 += plane_stride;
    }

    /***********/
    /* V Plane */
    /***********/

    /* copy the left and right most columns out */
    src_ptr1 = v_src;
    src_ptr2 = src_ptr1 + plane_width - 1;
    dest_ptr1 = src_ptr1 - Border;
    dest_ptr2 = src_ptr2 + 1;

    for (i = 0; i < plane_height; i++)
    {
        vpx_memset(dest_ptr1, src_ptr1[0], Border);
        vpx_memset(dest_ptr2, src_ptr2[0], Border);
        src_ptr1  += plane_stride;
        src_ptr2  += plane_stride;
        dest_ptr1 += plane_stride;
        dest_ptr2 += plane_stride;
    }
}

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static void decode_mb_rows(VP8D_COMP *pbi)
{
    VP8_COMMON *const pc = & pbi->common;
    MACROBLOCKD *const xd  = & pbi->mb;
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    MODE_INFO *lf_mic = xd->mode_info_context;

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    int ibc = 0;
    int num_part = 1 << pc->multi_token_partition;
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    int recon_yoffset, recon_uvoffset;
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    int mb_row, mb_col;
    int mb_idx = 0;
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    int dst_fb_idx = pc->new_fb_idx;
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    int recon_y_stride = pc->yv12_fb[dst_fb_idx].y_stride;
    int recon_uv_stride = pc->yv12_fb[dst_fb_idx].uv_stride;
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    unsigned char *ref_buffer[MAX_REF_FRAMES][3];
    unsigned char *dst_buffer[3];
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    unsigned char *lf_dst[3];
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    unsigned char *eb_dst[3];
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    int i;
    int ref_fb_index[MAX_REF_FRAMES];
    int ref_fb_corrupted[MAX_REF_FRAMES];
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    ref_fb_corrupted[INTRA_FRAME] = 0;
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    ref_fb_index[LAST_FRAME]    = pc->lst_fb_idx;
    ref_fb_index[GOLDEN_FRAME]  = pc->gld_fb_idx;
    ref_fb_index[ALTREF_FRAME]  = pc->alt_fb_idx;
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    for(i = 1; i < MAX_REF_FRAMES; i++)
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    {
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        ref_buffer[i][0] = pc->yv12_fb[ref_fb_index[i]].y_buffer;
        ref_buffer[i][1] = pc->yv12_fb[ref_fb_index[i]].u_buffer;
        ref_buffer[i][2] = pc->yv12_fb[ref_fb_index[i]].v_buffer;
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        ref_fb_corrupted[i] = pc->yv12_fb[ref_fb_index[i]].corrupted;
    }

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    /* Set up the buffer pointers */
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    eb_dst[0] = lf_dst[0] = dst_buffer[0] = pc->yv12_fb[dst_fb_idx].y_buffer;
    eb_dst[1] = lf_dst[1] = dst_buffer[1] = pc->yv12_fb[dst_fb_idx].u_buffer;
    eb_dst[2] = lf_dst[2] = dst_buffer[2] = pc->yv12_fb[dst_fb_idx].v_buffer;
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    xd->up_available = 0;

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    /* Initialize the loop filter for this frame. */
    if(pc->filter_level)
        vp8_loop_filter_frame_init(pc, xd, pc->filter_level);

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    vp8_setup_intra_recon_top_line(&pc->yv12_fb[dst_fb_idx]);

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    /* Decode the individual macro block */
    for (mb_row = 0; mb_row < pc->mb_rows; mb_row++)
    {
        if (num_part > 1)
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        {
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            xd->current_bc = & pbi->mbc[ibc];
            ibc++;

            if (ibc == num_part)
                ibc = 0;
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        }
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        recon_yoffset = mb_row * recon_y_stride * 16;
        recon_uvoffset = mb_row * recon_uv_stride * 8;
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        /* reset contexts */
        xd->above_context = pc->above_context;
        vpx_memset(xd->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));
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        xd->left_available = 0;
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        xd->mb_to_top_edge = -((mb_row * 16)) << 3;
        xd->mb_to_bottom_edge = ((pc->mb_rows - 1 - mb_row) * 16) << 3;
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        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;

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        /* TODO: move to outside row loop */
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        xd->recon_left_stride[0] = xd->dst.y_stride;
        xd->recon_left_stride[1] = xd->dst.uv_stride;

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        setup_intra_recon_left(xd->recon_left[0], xd->recon_left[1],
                               xd->recon_left[2], xd->dst.y_stride,
                               xd->dst.uv_stride);

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        for (mb_col = 0; mb_col < pc->mb_cols; mb_col++)
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        {
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            /* 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,
                                           pc->mode_info_stride);
                }
            }
#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;

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            /* propagate errors from reference frames */
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            xd->corrupted |= ref_fb_corrupted[xd->mode_info_context->mbmi.ref_frame];
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            decode_macroblock(pbi, xd, mb_idx);
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            mb_idx++;
            xd->left_available = 1;
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            /* check if the boolean decoder has suffered an error */
            xd->corrupted |= vp8dx_bool_error(xd->current_bc);
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            xd->recon_above[0] += 16;
            xd->recon_above[1] += 8;
            xd->recon_above[2] += 8;
            xd->recon_left[0] += 16;
            xd->recon_left[1] += 8;
            xd->recon_left[2] += 8;

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            recon_yoffset += 16;
            recon_uvoffset += 8;
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            ++xd->mode_info_context;  /* next mb */
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            xd->above_context++;
        }
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        /* adjust to the next row of mbs */
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        vp8_extend_mb_row(&pc->yv12_fb[dst_fb_idx], xd->dst.y_buffer + 16,
                          xd->dst.u_buffer + 8, xd->dst.v_buffer + 8);
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        ++xd->mode_info_context;      /* skip prediction column */
        xd->up_available = 1;

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        if(pc->filter_level)
        {
            if(mb_row > 0)
            {
                if (pc->filter_type == NORMAL_LOOPFILTER)
                    vp8_loop_filter_row_normal(pc, lf_mic, mb_row-1,
                                               recon_y_stride, recon_uv_stride,
                                               lf_dst[0], lf_dst[1], lf_dst[2]);
                else
                    vp8_loop_filter_row_simple(pc, lf_mic, mb_row-1,
                                               recon_y_stride, recon_uv_stride,
                                               lf_dst[0], lf_dst[1], lf_dst[2]);
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                if(mb_row > 1)
                {
                    yv12_extend_frame_left_right_c(&pc->yv12_fb[dst_fb_idx],
                                                   eb_dst[0],
                                                   eb_dst[1],
                                                   eb_dst[2]);

                    eb_dst[0] += recon_y_stride  * 16;
                    eb_dst[1] += recon_uv_stride *  8;
                    eb_dst[2] += recon_uv_stride *  8;

                    if(mb_row == 2)
                        yv12_extend_frame_top_c(&pc->yv12_fb[dst_fb_idx]);

                }

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                lf_dst[0] += recon_y_stride  * 16;
                lf_dst[1] += recon_uv_stride *  8;
                lf_dst[2] += recon_uv_stride *  8;
                lf_mic += pc->mb_cols;
                lf_mic++;         /* Skip border mb */
            }
        }
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        else
        {
            if(mb_row > 0)
            {
                /**/
                yv12_extend_frame_left_right_c(&pc->yv12_fb[dst_fb_idx],
                                               eb_dst[0],
                                               eb_dst[1],
                                               eb_dst[2]);

                eb_dst[0] += recon_y_stride  * 16;
                eb_dst[1] += recon_uv_stride *  8;
                eb_dst[2] += recon_uv_stride *  8;

                if(mb_row == 1)
                    yv12_extend_frame_top_c(&pc->yv12_fb[dst_fb_idx]);
            }
        }
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    }

    if(pc->filter_level)
    {
        if (pc->filter_type == NORMAL_LOOPFILTER)
            vp8_loop_filter_row_normal(pc, lf_mic, mb_row-1, recon_y_stride,
                                       recon_uv_stride, lf_dst[0], lf_dst[1],
                                       lf_dst[2]);
        else
            vp8_loop_filter_row_simple(pc, lf_mic, mb_row-1, recon_y_stride,
                                       recon_uv_stride, lf_dst[0], lf_dst[1],
                                       lf_dst[2]);
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        yv12_extend_frame_left_right_c(&pc->yv12_fb[dst_fb_idx],
                                       eb_dst[0],
                                       eb_dst[1],
                                       eb_dst[2]);
        eb_dst[0] += recon_y_stride  * 16;
        eb_dst[1] += recon_uv_stride *  8;
        eb_dst[2] += recon_uv_stride *  8;
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    }
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    yv12_extend_frame_left_right_c(&pc->yv12_fb[dst_fb_idx],
                                   eb_dst[0],
                                   eb_dst[1],
                                   eb_dst[2]);
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    yv12_extend_frame_bottom_c(&pc->yv12_fb[dst_fb_idx]);
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}
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static unsigned int read_partition_size(const unsigned char *cx_size)
{
    const unsigned int size =
        cx_size[0] + (cx_size[1] << 8) + (cx_size[2] << 16);
    return size;
}

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static int read_is_valid(const unsigned char *start,
                         size_t               len,
                         const unsigned char *end)
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{
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    return (start + len > start && start + len <= end);
}
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static unsigned int read_available_partition_size(
                                       VP8D_COMP *pbi,
                                       const unsigned char *token_part_sizes,
                                       const unsigned char *fragment_start,
                                       const unsigned char *first_fragment_end,
                                       const unsigned char *fragment_end,
                                       int i,
                                       int num_part)
{
    VP8_COMMON* pc = &pbi->common;
    const unsigned char *partition_size_ptr = token_part_sizes + i * 3;
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    unsigned int partition_size = 0;
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    ptrdiff_t bytes_left = fragment_end - fragment_start;
    /* Calculate the length of this partition. The last partition
     * size is implicit. If the partition size can't be read, then
     * either use the remaining data in the buffer (for EC mode)
     * or throw an error.
     */
    if (i < num_part - 1)
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    {
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        if (read_is_valid(partition_size_ptr, 3, first_fragment_end))
            partition_size = read_partition_size(partition_size_ptr);
        else if (pbi->ec_active)
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            partition_size = (unsigned int)bytes_left;
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        else
            vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                               "Truncated partition size data");
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    }
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    else
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        partition_size = (unsigned int)bytes_left;
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    /* Validate the calculated partition length. If the buffer
     * described by the partition can't be fully read, then restrict
     * it to the portion that can be (for EC mode) or throw an error.
     */
    if (!read_is_valid(fragment_start, partition_size, fragment_end))
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    {
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        if (pbi->ec_active)
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            partition_size = (unsigned int)bytes_left;
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        else
            vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                               "Truncated packet or corrupt partition "
                               "%d length", i + 1);
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    }
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    return partition_size;
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}


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static void setup_token_decoder(VP8D_COMP *pbi,
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                                const unsigned char* token_part_sizes)
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{
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    vp8_reader *bool_decoder = &pbi->bc2;
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    unsigned int partition_idx;
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    unsigned int fragment_idx;
    unsigned int num_token_partitions;
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    const unsigned char *first_fragment_end = pbi->fragments[0] +
                                          pbi->fragment_sizes[0];
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    TOKEN_PARTITION multi_token_partition =
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            (TOKEN_PARTITION)vp8_read_literal(&pbi->bc, 2);
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    if (!vp8dx_bool_error(&pbi->bc))
        pbi->common.multi_token_partition = multi_token_partition;
    num_token_partitions = 1 << pbi->common.multi_token_partition;
    if (num_token_partitions > 1)
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    {
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        bool_decoder = &pbi->mbc[0];
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    }

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    /* Check for partitions within the fragments and unpack the fragments
     * so that each fragment pointer points to its corresponding partition. */
    for (fragment_idx = 0; fragment_idx < pbi->num_fragments; ++fragment_idx)
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    {
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        unsigned int fragment_size = pbi->fragment_sizes[fragment_idx];
        const unsigned char *fragment_end = pbi->fragments[fragment_idx] +
                                            fragment_size;
        /* Special case for handling the first partition since we have already
         * read its size. */
        if (fragment_idx == 0)
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        {
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            /* Size of first partition + token partition sizes element */
            ptrdiff_t ext_first_part_size = token_part_sizes -
                pbi->fragments[0] + 3 * (num_token_partitions - 1);
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            fragment_size -= (unsigned int)ext_first_part_size;
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            if (fragment_size > 0)
            {
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                pbi->fragment_sizes[0] = (unsigned int)ext_first_part_size;
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                /* The fragment contains an additional partition. Move to
                 * next. */
                fragment_idx++;
                pbi->fragments[fragment_idx] = pbi->fragments[0] +
                  pbi->fragment_sizes[0];
            }
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        }
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        /* Split the chunk into partitions read from the bitstream */
        while (fragment_size > 0)
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        {
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            ptrdiff_t partition_size = read_available_partition_size(
                                                 pbi,
                                                 token_part_sizes,
                                                 pbi->fragments[fragment_idx],
                                                 first_fragment_end,
                                                 fragment_end,
                                                 fragment_idx - 1,
                                                 num_token_partitions);
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            pbi->fragment_sizes[fragment_idx] = (unsigned int)partition_size;
            fragment_size -= (unsigned int)partition_size;
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            assert(fragment_idx <= num_token_partitions);
            if (fragment_size > 0)
            {
                /* The fragment contains an additional partition.
                 * Move to next. */
                fragment_idx++;
                pbi->fragments[fragment_idx] =
                    pbi->fragments[fragment_idx - 1] + partition_size;
            }
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        }
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    }

    pbi->num_fragments = num_token_partitions + 1;
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    for (partition_idx = 1; partition_idx < pbi->num_fragments; ++partition_idx)
    {
        if (vp8dx_start_decode(bool_decoder,
                               pbi->fragments[partition_idx],
                               pbi->fragment_sizes[partition_idx]))
            vpx_internal_error(&pbi->common.error, VPX_CODEC_MEM_ERROR,
                               "Failed to allocate bool decoder %d",
                               partition_idx);
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        bool_decoder++;
    }

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#if CONFIG_MULTITHREAD
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    /* Clamp number of decoder threads */
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    if (pbi->decoding_thread_count > num_token_partitions - 1)
        pbi->decoding_thread_count = num_token_partitions - 1;
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#endif
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}


static void init_frame(VP8D_COMP *pbi)
{
    VP8_COMMON *const pc = & pbi->common;
    MACROBLOCKD *const xd  = & pbi->mb;

    if (pc->frame_type == KEY_FRAME)
    {
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        /* Various keyframe initializations */
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        vpx_memcpy(pc->fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));

        vp8_init_mbmode_probs(pc);

        vp8_default_coef_probs(pc);

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        /* reset the segment feature data to 0 with delta coding (Default state). */
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        vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));
        xd->mb_segement_abs_delta = SEGMENT_DELTADATA;

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        /* reset the mode ref deltasa for loop filter */
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        vpx_memset(xd->ref_lf_deltas, 0, sizeof(xd->ref_lf_deltas));
        vpx_memset(xd->mode_lf_deltas, 0, sizeof(xd->mode_lf_deltas));

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        /* All buffers are implicitly updated on key frames. */
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        pc->refresh_golden_frame = 1;
        pc->refresh_alt_ref_frame = 1;
        pc->copy_buffer_to_gf = 0;
        pc->copy_buffer_to_arf = 0;

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        /* Note that Golden and Altref modes cannot be used on a key frame so
         * ref_frame_sign_bias[] is undefined and meaningless
         */
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        pc->ref_frame_sign_bias[GOLDEN_FRAME] = 0;
        pc->ref_frame_sign_bias[ALTREF_FRAME] = 0;
    }
    else
    {
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        /* To enable choice of different interploation filters */
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        if (!pc->use_bilinear_mc_filter)
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        {
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            xd->subpixel_predict        = vp8_sixtap_predict4x4;
            xd->subpixel_predict8x4     = vp8_sixtap_predict8x4;
            xd->subpixel_predict8x8     = vp8_sixtap_predict8x8;
            xd->subpixel_predict16x16   = vp8_sixtap_predict16x16;
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        }
        else
        {
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            xd->subpixel_predict        = vp8_bilinear_predict4x4;
            xd->subpixel_predict8x4     = vp8_bilinear_predict8x4;
            xd->subpixel_predict8x8     = vp8_bilinear_predict8x8;
            xd->subpixel_predict16x16   = vp8_bilinear_predict16x16;
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        }
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        if (pbi->decoded_key_frame && pbi->ec_enabled && !pbi->ec_active)
            pbi->ec_active = 1;
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    }

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    xd->left_context = &pc->left_context;
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    xd->mode_info_context = pc->mi;
    xd->frame_type = pc->frame_type;
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    xd->mode_info_context->mbmi.mode = DC_PRED;
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    xd->mode_info_stride = pc->mode_info_stride;
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    xd->corrupted = 0; /* init without corruption */
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    xd->fullpixel_mask = 0xffffffff;
    if(pc->full_pixel)
        xd->fullpixel_mask = 0xfffffff8;

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}

int vp8_decode_frame(VP8D_COMP *pbi)
{
    vp8_reader *const bc = & pbi->bc;
    VP8_COMMON *const pc = & pbi->common;
    MACROBLOCKD *const xd  = & pbi->mb;
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    const unsigned char *data = pbi->fragments[0];
    const unsigned char *data_end =  data + pbi->fragment_sizes[0];
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    ptrdiff_t first_partition_length_in_bytes;
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    int i, j, k, l;
    const int *const mb_feature_data_bits = vp8_mb_feature_data_bits;
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    int corrupt_tokens = 0;
    int prev_independent_partitions = pbi->independent_partitions;
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    /* start with no corruption of current frame */
    xd->corrupted = 0;
    pc->yv12_fb[pc->new_fb_idx].corrupted = 0;

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    if (data_end - data < 3)
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    {
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        if (!pbi->ec_active)
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        {
            vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                               "Truncated packet");
        }
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        /* Declare the missing frame as an inter frame since it will
           be handled as an inter frame when we have estimated its
           motion vectors. */
        pc->frame_type = INTER_FRAME;
        pc->version = 0;
        pc->show_frame = 1;
        first_partition_length_in_bytes = 0;
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    }
    else
    {
        pc->frame_type = (FRAME_TYPE)(data[0] & 1);
        pc->version = (data[0] >> 1) & 7;
        pc->show_frame = (data[0] >> 4) & 1;
        first_partition_length_in_bytes =
            (data[0] | (data[1] << 8) | (data[2] << 16)) >> 5;
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        if (!pbi->ec_active && (data + first_partition_length_in_bytes > data_end
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            || data + first_partition_length_in_bytes < data))
            vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                               "Truncated packet or corrupt partition 0 length");
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        data += 3;

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        vp8_setup_version(pc);
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        if (pc->frame_type == KEY_FRAME)
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        {
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            const int Width = pc->Width;
            const int Height = pc->Height;

            /* vet via sync code */
            /* When error concealment is enabled we should only check the sync
             * code if we have enough bits available
             */
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            if (!pbi->ec_active || data + 3 < data_end)
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            {
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                if (data[0] != 0x9d || data[1] != 0x01 || data[2] != 0x2a)
                    vpx_internal_error(&pc->error, VPX_CODEC_UNSUP_BITSTREAM,
                                   "Invalid frame sync code");
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            }

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            /* If error concealment is enabled we should only parse the new size
             * if we have enough data. Otherwise we will end up with the wrong
             * size.
             */
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            if (!pbi->ec_active || data + 6 < data_end)
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            {
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                pc->Width = (data[3] | (data[4] << 8)) & 0x3fff;
                pc->horiz_scale = data[4] >> 6;
                pc->Height = (data[5] | (data[6] << 8)) & 0x3fff;
                pc->vert_scale = data[6] >> 6;
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            }
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            data += 7;

            if (Width != pc->Width  ||  Height != pc->Height)
            {
                int prev_mb_rows = pc->mb_rows;

                if (pc->Width <= 0)
                {
                    pc->Width = Width;
                    vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                                       "Invalid frame width");
                }

                if (pc->Height <= 0)
                {
                    pc->Height = Height;
                    vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                                       "Invalid frame height");
                }
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                if (vp8_alloc_frame_buffers(pc, pc->Width, pc->Height))
                    vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
                                       "Failed to allocate frame buffers");

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                vpx_memcpy(&xd->pre, &pc->yv12_fb[pc->lst_fb_idx], sizeof(YV12_BUFFER_CONFIG));
                vpx_memcpy(&xd->dst, &pc->yv12_fb[pc->new_fb_idx], sizeof(YV12_BUFFER_CONFIG));

#if CONFIG_MULTITHREAD
                for (i = 0; i < pbi->allocated_decoding_thread_count; i++)
                {
                    pbi->mb_row_di[i].mbd.dst = pc->yv12_fb[pc->new_fb_idx];
                    vp8_build_block_doffsets(&pbi->mb_row_di[i].mbd);
                }
#endif
                vp8_build_block_doffsets(&pbi->mb);

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                /* allocate memory for last frame MODE_INFO array */
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#if CONFIG_ERROR_CONCEALMENT
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                if (pbi->ec_enabled)
                {
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                    /* old prev_mip was released by vp8_de_alloc_frame_buffers()
                     * called in vp8_alloc_frame_buffers() */
                    pc->prev_mip = vpx_calloc(
                                       (pc->mb_cols + 1) * (pc->mb_rows + 1),
                                       sizeof(MODE_INFO));

                    if (!pc->prev_mip)
                    {
                        vp8_de_alloc_frame_buffers(pc);
                        vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
                                           "Failed to allocate"
                                           "last frame MODE_INFO array");
                    }

                    pc->prev_mi = pc->prev_mip + pc->mode_info_stride + 1;

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                    if (vp8_alloc_overlap_lists(pbi))
                        vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
                                           "Failed to allocate overlap lists "
                                           "for error concealment");
                }
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#endif
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#if CONFIG_MULTITHREAD
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                if (pbi->b_multithreaded_rd)
                    vp8mt_alloc_temp_buffers(pbi, pc->Width, prev_mb_rows);
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#else
                (void)prev_mb_rows;
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#endif
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            }
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        }
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        else
        {
          vpx_memcpy(&xd->pre, &pc->yv12_fb[pc->lst_fb_idx], sizeof(YV12_BUFFER_CONFIG));
          vpx_memcpy(&xd->dst, &pc->yv12_fb[pc->new_fb_idx], sizeof(YV12_BUFFER_CONFIG));
        }
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    }
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    if ((!pbi->decoded_key_frame && pc->frame_type != KEY_FRAME) ||
        pc->Width == 0 || pc->Height == 0)
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    {
        return -1;
    }

    init_frame(pbi);

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    if (vp8dx_start_decode(bc, data, (unsigned int)(data_end - data)))
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        vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
                           "Failed to allocate bool decoder 0");
    if (pc->frame_type == KEY_FRAME) {
        pc->clr_type    = (YUV_TYPE)vp8_read_bit(bc);
        pc->clamp_type  = (CLAMP_TYPE)vp8_read_bit(bc);
    }

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    /* Is segmentation enabled */
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    xd->segmentation_enabled = (unsigned char)vp8_read_bit(bc);

    if (xd->segmentation_enabled)
    {
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        /* Signal whether or not the segmentation map is being explicitly updated this frame. */
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        xd->update_mb_segmentation_map = (unsigned char)vp8_read_bit(bc);
        xd->update_mb_segmentation_data = (unsigned char)vp8_read_bit(bc);

        if (xd->update_mb_segmentation_data)
        {
            xd->mb_segement_abs_delta = (unsigned char)vp8_read_bit(bc);

            vpx_memset(xd->segment_feature_data, 0, sizeof(xd->segment_feature_data));

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            /* For each segmentation feature (Quant and loop filter level) */
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            for (i = 0; i < MB_LVL_MAX; i++)
            {
                for (j = 0; j < MAX_MB_SEGMENTS; j++)
                {
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                    /* Frame level data */
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                    if (vp8_read_bit(bc))
                    {
                        xd->segment_feature_data[i][j] = (signed char)vp8_read_literal(bc, mb_feature_data_bits[i]);

                        if (vp8_read_bit(bc))
                            xd->segment_feature_data[i][j] = -xd->segment_feature_data[i][j];
                    }
                    else
                        xd->segment_feature_data[i][j] = 0;
                }
            }
        }

        if (xd->update_mb_segmentation_map)
        {
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            /* Which macro block level features are enabled */
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            vpx_memset(xd->mb_segment_tree_probs, 255, sizeof(xd->mb_segment_tree_probs));

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            /* Read the probs used to decode the segment id for each macro block. */
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            for (i = 0; i < MB_FEATURE_TREE_PROBS; i++)
            {
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                /* If not explicitly set value is defaulted to 255 by memset above */
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                if (vp8_read_bit(bc))
                    xd->mb_segment_tree_probs[i] = (vp8_prob)vp8_read_literal(bc, 8);
            }
        }
    }
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    else
    {
        /* No segmentation updates on this frame */
        xd->update_mb_segmentation_map = 0;
        xd->update_mb_segmentation_data = 0;
    }
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    /* Read the loop filter level and type */
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    pc->filter_type = (LOOPFILTERTYPE) vp8_read_bit(bc);
    pc->filter_level = vp8_read_literal(bc, 6);
    pc->sharpness_level = vp8_read_literal(bc, 3);

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    /* Read in loop filter deltas applied at the MB level based on mode or ref frame. */
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    xd->mode_ref_lf_delta_update = 0;
    xd->mode_ref_lf_delta_enabled = (unsigned char)vp8_read_bit(bc);

    if (xd->mode_ref_lf_delta_enabled)
    {
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        /* Do the deltas need to be updated */
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        xd->mode_ref_lf_delta_update = (unsigned char)vp8_read_bit(bc);

        if (xd->mode_ref_lf_delta_update)
        {
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            /* Send update */
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            for (i = 0; i < MAX_REF_LF_DELTAS; i++)
            {
                if (vp8_read_bit(bc))
                {
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                    /*sign = vp8_read_bit( bc );*/
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                    xd->ref_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);

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                    if (vp8_read_bit(bc))        /* Apply sign */
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                        xd->ref_lf_deltas[i] = xd->ref_lf_deltas[i] * -1;
                }
            }

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            /* Send update */
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            for (i = 0; i < MAX_MODE_LF_DELTAS; i++)
            {
                if (vp8_read_bit(bc))
                {
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                    /*sign = vp8_read_bit( bc );*/
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                    xd->mode_lf_deltas[i] = (signed char)vp8_read_literal(bc, 6);

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                    if (vp8_read_bit(bc))        /* Apply sign */
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                        xd->mode_lf_deltas[i] = xd->mode_lf_deltas[i] * -1;
                }
            }
        }
    }

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    setup_token_decoder(pbi, data + first_partition_length_in_bytes);

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    xd->current_bc = &pbi->bc2;

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    /* Read the default quantizers. */
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