/*

 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.

 *

 *  Use of this source code is governed by a BSD-style license

 *  that can be found in the LICENSE file in the root of the source

 *  tree. An additional intellectual property rights grant can be found

 *  in the file PATENTS.  All contributing project authors may

 *  be found in the AUTHORS file in the root of the source tree.

 */

#include "vpx_config.h"

#include "vp8_rtcd.h"

#include "./vpx_scale_rtcd.h"

#include "onyxd_int.h"

#include "vp8/common/header.h"

#include "vp8/common/reconintra4x4.h"

#include "vp8/common/reconinter.h"

#include "detokenize.h"

#include "vp8/common/common.h"

#include "vp8/common/invtrans.h"

#include "vp8/common/alloccommon.h"

#include "vp8/common/entropymode.h"

#include "vp8/common/quant_common.h"

#include "vpx_scale/vpx_scale.h"

#include "vp8/common/reconintra.h"

#include "vp8/common/setupintrarecon.h"

#include "decodemv.h"

#include "vp8/common/extend.h"

#if CONFIG_ERROR_CONCEALMENT

#include "error_concealment.h"

#endif

#include "vpx_mem/vpx_mem.h"

#include "vp8/common/threading.h"

#include "decoderthreading.h"

#include "dboolhuff.h"

#include "vpx_dsp/vpx_dsp_common.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) {

    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);

    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);

  }

}

void vp8_mb_init_dequantizer(VP8D_COMP *pbi, MACROBLOCKD *xd) {

  int i;

  int QIndex;

  MB_MODE_INFO *mbmi = &xd->mode_info_context->mbmi;

  VP8_COMMON *const pc = &pbi->common;

  /* Decide whether to use the default or alternate baseline Q value. */

  if (xd->segmentation_enabled) {

    /* Abs Value */

    if (xd->mb_segment_abs_delta == SEGMENT_ABSDATA) {

      QIndex = xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];

      /* Delta Value */

    } else {

      QIndex = pc->base_qindex +

               xd->segment_feature_data[MB_LVL_ALT_Q][mbmi->segment_id];

    }

    QIndex = (QIndex >= 0) ? ((QIndex <= MAXQ) ? QIndex : MAXQ)

                           : 0; /* Clamp to valid range */

  } else {

    QIndex = pc->base_qindex;

  }

  /* 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];

  for (i = 1; i < 16; ++i) {

    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];

  }

}

static void decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,

                              unsigned int mb_idx) {

  MB_PREDICTION_MODE mode;

  int i;

#if CONFIG_ERROR_CONCEALMENT

  int corruption_detected = 0;

#else

  (void)mb_idx;

#endif

  if (xd->mode_info_context->mbmi.mb_skip_coeff) {

    vp8_reset_mb_tokens_context(xd);

  } else if (!vp8dx_bool_error(xd->current_bc)) {

    int eobtotal;

    eobtotal = vp8_decode_mb_tokens(pbi, xd);

    /* Special case:  Force the loopfilter to skip when eobtotal is zero */

    xd->mode_info_context->mbmi.mb_skip_coeff = (eobtotal == 0);

  }

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

  if (xd->segmentation_enabled) vp8_mb_init_dequantizer(pbi, xd);

#if CONFIG_ERROR_CONCEALMENT

  if (pbi->ec_active) {

    int throw_residual;

    /* When we have independent partitions we can apply residual even

     * though other partitions within the frame are corrupt.

     */

    throw_residual =

        (!pbi->independent_partitions && pbi->frame_corrupt_residual);

    throw_residual = (throw_residual || vp8dx_bool_error(xd->current_bc));

    if ((mb_idx >= pbi->mvs_corrupt_from_mb || throw_residual)) {

      /* MB with corrupt residuals or corrupt mode/motion vectors.

       * Better to use the predictor as reconstruction.

       */

      pbi->frame_corrupt_residual = 1;

      memset(xd->qcoeff, 0, sizeof(xd->qcoeff));

      corruption_detected = 1;

      /* force idct to be skipped for B_PRED and use the

       * prediction only for reconstruction

       * */

      memset(xd->eobs, 0, 25);

    }

  }

#endif

  /* do prediction */

  if (xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME) {

    vp8_build_intra_predictors_mbuv_s(

        xd, xd->recon_above[1], xd->recon_above[2], xd->recon_left[1],

        xd->recon_left[2], xd->recon_left_stride[1], xd->dst.u_buffer,

        xd->dst.v_buffer, xd->dst.uv_stride);

    if (mode != B_PRED) {

      vp8_build_intra_predictors_mby_s(

          xd, xd->recon_above[0], xd->recon_left[0], xd->recon_left_stride[0],

          xd->dst.y_buffer, xd->dst.y_stride);

    } else {

      short *DQC = xd->dequant_y1;

      int dst_stride = xd->dst.y_stride;

      /* clear out residual eob info */

      if (xd->mode_info_context->mbmi.mb_skip_coeff) memset(xd->eobs, 0, 25);

      intra_prediction_down_copy(xd, xd->recon_above[0] + 16);

      for (i = 0; i < 16; ++i) {

        BLOCKD *b = &xd->block[i];

        unsigned char *dst = xd->dst.y_buffer + b->offset;

        B_PREDICTION_MODE b_mode = xd->mode_info_context->bmi[i].as_mode;

        unsigned char *Above = dst - dst_stride;

        unsigned char *yleft = dst - 1;

        int left_stride = dst_stride;

        unsigned char top_left = Above[-1];

        vp8_intra4x4_predict(Above, yleft, left_stride, b_mode, dst, dst_stride,

                             top_left);

        if (xd->eobs[i]) {

          if (xd->eobs[i] > 1) {

            vp8_dequant_idct_add(b->qcoeff, DQC, dst, dst_stride);

          } else {

            vp8_dc_only_idct_add(b->qcoeff[0] * DQC[0], dst, dst_stride, dst,

                                 dst_stride);

            memset(b->qcoeff, 0, 2 * sizeof(b->qcoeff[0]));

          }

        }

      }

    }

  } else {

    vp8_build_inter_predictors_mb(xd);

  }

#if CONFIG_ERROR_CONCEALMENT

  if (corruption_detected) {

    return;

  }

#endif

  if (!xd->mode_info_context->mbmi.mb_skip_coeff) {

    /* dequantization and idct */

    if (mode != B_PRED) {

      short *DQC = xd->dequant_y1;

      if (mode != SPLITMV) {

        BLOCKD *b = &xd->block[24];

        /* do 2nd order transform on the dc block */

        if (xd->eobs[24] > 1) {

          vp8_dequantize_b(b, xd->dequant_y2);

          vp8_short_inv_walsh4x4(&b->dqcoeff[0], xd->qcoeff);

          memset(b->qcoeff, 0, 16 * sizeof(b->qcoeff[0]));

        } else {

          b->dqcoeff[0] = (short)(b->qcoeff[0] * xd->dequant_y2[0]);

          vp8_short_inv_walsh4x4_1(&b->dqcoeff[0], xd->qcoeff);

          memset(b->qcoeff, 0, 2 * sizeof(b->qcoeff[0]));

        }

        /* override the dc dequant constant in order to preserve the

         * dc components

         */

        DQC = xd->dequant_y1_dc;

      }

      vp8_dequant_idct_add_y_block(xd->qcoeff, DQC, xd->dst.y_buffer,

                                   xd->dst.y_stride, xd->eobs);

    }

    vp8_dequant_idct_add_uv_block(xd->qcoeff + 16 * 16, xd->dequant_uv,

                                  xd->dst.u_buffer, xd->dst.v_buffer,

                                  xd->dst.uv_stride, xd->eobs + 16);

  }

}

static 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

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) {

    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) {

    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) {

    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) {

    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) {

    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) {

    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) {

    memset(dest_ptr1, src_ptr1[0], Border);

    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) {

    memset(dest_ptr1, src_ptr1[0], Border);

    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) {

    memset(dest_ptr1, src_ptr1[0], Border);

    memset(dest_ptr2, src_ptr2[0], Border);

    src_ptr1 += plane_stride;

    src_ptr2 += plane_stride;

    dest_ptr1 += plane_stride;

    dest_ptr2 += plane_stride;

  }

}

static void decode_mb_rows(VP8D_COMP *pbi) {

  VP8_COMMON *const pc = &pbi->common;

  MACROBLOCKD *const xd = &pbi->mb;

  MODE_INFO *lf_mic = xd->mode_info_context;

  int ibc = 0;

  int num_part = 1 << pc->multi_token_partition;

  int recon_yoffset, recon_uvoffset;

  int mb_row, mb_col;

  int mb_idx = 0;

  YV12_BUFFER_CONFIG *yv12_fb_new = pbi->dec_fb_ref[INTRA_FRAME];

  int recon_y_stride = yv12_fb_new->y_stride;

  int recon_uv_stride = yv12_fb_new->uv_stride;

  unsigned char *ref_buffer[MAX_REF_FRAMES][3];

  unsigned char *dst_buffer[3];

  unsigned char *lf_dst[3];

  unsigned char *eb_dst[3];

  int i;

  int ref_fb_corrupted[MAX_REF_FRAMES];

  ref_fb_corrupted[INTRA_FRAME] = 0;

  for (i = 1; i < MAX_REF_FRAMES; ++i) {

    YV12_BUFFER_CONFIG *this_fb = pbi->dec_fb_ref[i];

    ref_buffer[i][0] = this_fb->y_buffer;

    ref_buffer[i][1] = this_fb->u_buffer;

    ref_buffer[i][2] = this_fb->v_buffer;

    ref_fb_corrupted[i] = this_fb->corrupted;

  }

  /* Set up the buffer pointers */

  eb_dst[0] = lf_dst[0] = dst_buffer[0] = yv12_fb_new->y_buffer;

  eb_dst[1] = lf_dst[1] = dst_buffer[1] = yv12_fb_new->u_buffer;

  eb_dst[2] = lf_dst[2] = dst_buffer[2] = yv12_fb_new->v_buffer;

  xd->up_available = 0;

  /* Initialize the loop filter for this frame. */

  if (pc->filter_level) vp8_loop_filter_frame_init(pc, xd, pc->filter_level);

  vp8_setup_intra_recon_top_line(yv12_fb_new);

  /* Decode the individual macro block */

  for (mb_row = 0; mb_row < pc->mb_rows; ++mb_row) {

    if (num_part > 1) {

      xd->current_bc = &pbi->mbc[ibc];

      ibc++;

      if (ibc == num_part) ibc = 0;

    }

    recon_yoffset = mb_row * recon_y_stride * 16;

    recon_uvoffset = mb_row * recon_uv_stride * 8;

    /* reset contexts */

    xd->above_context = pc->above_context;

    memset(xd->left_context, 0, sizeof(ENTROPY_CONTEXT_PLANES));

    xd->left_available = 0;

    xd->mb_to_top_edge = -((mb_row * 16) << 3);

    xd->mb_to_bottom_edge = ((pc->mb_rows - 1 - mb_row) * 16) << 3;

    xd->recon_above[0] = dst_buffer[0] + recon_yoffset;

    xd->recon_above[1] = dst_buffer[1] + recon_uvoffset;

    xd->recon_above[2] = dst_buffer[2] + recon_uvoffset;

    xd->recon_left[0] = xd->recon_above[0] - 1;

    xd->recon_left[1] = xd->recon_above[1] - 1;

    xd->recon_left[2] = xd->recon_above[2] - 1;

    xd->recon_above[0] -= xd->dst.y_stride;

    xd->recon_above[1] -= xd->dst.uv_stride;

    xd->recon_above[2] -= xd->dst.uv_stride;

    /* TODO: move to outside row loop */

    xd->recon_left_stride[0] = xd->dst.y_stride;

    xd->recon_left_stride[1] = xd->dst.uv_stride;

    setup_intra_recon_left(xd->recon_left[0], xd->recon_left[1],

                           xd->recon_left[2], xd->dst.y_stride,

                           xd->dst.uv_stride);

    for (mb_col = 0; mb_col < pc->mb_cols; ++mb_col) {

      /* Distance of Mb to the various image edges.

       * These are specified to 8th pel as they are always compared to values

       * that are in 1/8th pel units

       */

      xd->mb_to_left_edge = -((mb_col * 16) << 3);

      xd->mb_to_right_edge = ((pc->mb_cols - 1 - mb_col) * 16) << 3;

#if CONFIG_ERROR_CONCEALMENT

      {

        int corrupt_residual =

            (!pbi->independent_partitions && pbi->frame_corrupt_residual) ||

            vp8dx_bool_error(xd->current_bc);

        if (pbi->ec_active &&

            xd->mode_info_context->mbmi.ref_frame == INTRA_FRAME &&

            corrupt_residual) {

          /* We have an intra block with corrupt coefficients, better to

           * conceal with an inter block. Interpolate MVs from neighboring

           * MBs.

           *

           * Note that for the first mb with corrupt residual in a frame,

           * we might not discover that before decoding the residual. That

           * happens after this check, and therefore no inter concealment

           * will be done.

           */

          vp8_interpolate_motion(xd, mb_row, mb_col, pc->mb_rows, pc->mb_cols);

        }

      }

#endif

      xd->dst.y_buffer = dst_buffer[0] + recon_yoffset;

      xd->dst.u_buffer = dst_buffer[1] + recon_uvoffset;

      xd->dst.v_buffer = dst_buffer[2] + recon_uvoffset;

      if (xd->mode_info_context->mbmi.ref_frame >= LAST_FRAME) {

        const MV_REFERENCE_FRAME ref = xd->mode_info_context->mbmi.ref_frame;

        xd->pre.y_buffer = ref_buffer[ref][0] + recon_yoffset;

        xd->pre.u_buffer = ref_buffer[ref][1] + recon_uvoffset;

        xd->pre.v_buffer = ref_buffer[ref][2] + recon_uvoffset;

      } else {

        // ref_frame is INTRA_FRAME, pre buffer should not be used.

        xd->pre.y_buffer = 0;

        xd->pre.u_buffer = 0;

        xd->pre.v_buffer = 0;

      }

      /* propagate errors from reference frames */

      xd->corrupted |= ref_fb_corrupted[xd->mode_info_context->mbmi.ref_frame];

      decode_macroblock(pbi, xd, mb_idx);

      mb_idx++;

      xd->left_available = 1;

      /* check if the boolean decoder has suffered an error */

      xd->corrupted |= vp8dx_bool_error(xd->current_bc);

      xd->recon_above[0] += 16;

      xd->recon_above[1] += 8;

      xd->recon_above[2] += 8;

      xd->recon_left[0] += 16;

      xd->recon_left[1] += 8;

      xd->recon_left[2] += 8;

      recon_yoffset += 16;

      recon_uvoffset += 8;

      ++xd->mode_info_context; /* next mb */

      xd->above_context++;

    }

    /* adjust to the next row of mbs */

    vp8_extend_mb_row(yv12_fb_new, xd->dst.y_buffer + 16, xd->dst.u_buffer + 8,

                      xd->dst.v_buffer + 8);

    ++xd->mode_info_context; /* skip prediction column */

    xd->up_available = 1;

    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,

                                     lf_dst[0]);

        }

        if (mb_row > 1) {

          yv12_extend_frame_left_right_c(yv12_fb_new, 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;

        }

        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 */

      }

    } else {

      if (mb_row > 0) {

        /**/

        yv12_extend_frame_left_right_c(yv12_fb_new, 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 (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,

                                 lf_dst[0]);

    }

    yv12_extend_frame_left_right_c(yv12_fb_new, 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;

  }

  yv12_extend_frame_left_right_c(yv12_fb_new, eb_dst[0], eb_dst[1], eb_dst[2]);

  yv12_extend_frame_top_c(yv12_fb_new);

  yv12_extend_frame_bottom_c(yv12_fb_new);

}

static unsigned int read_partition_size(VP8D_COMP *pbi,

                                        const unsigned char *cx_size) {

  unsigned char temp[3];

  if (pbi->decrypt_cb) {

    pbi->decrypt_cb(pbi->decrypt_state, cx_size, temp, 3);

    cx_size = temp;

  }

  return cx_size[0] + (cx_size[1] << 8) + (cx_size[2] << 16);

}

static int read_is_valid(const unsigned char *start, size_t len,

                         const unsigned char *end) {

  return len != 0 && end > start && len <= (size_t)(end - start);

}

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;

  unsigned int partition_size = 0;

  ptrdiff_t bytes_left = fragment_end - fragment_start;

  if (bytes_left < 0) {

    vpx_internal_error(

        &pc->error, VPX_CODEC_CORRUPT_FRAME,

        "Truncated packet or corrupt partition. No bytes left %d.",

        (int)bytes_left);

  }

  /* 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) {

    if (read_is_valid(partition_size_ptr, 3, first_fragment_end)) {

      partition_size = read_partition_size(pbi, partition_size_ptr);

    } else if (pbi->ec_active) {

      partition_size = (unsigned int)bytes_left;

    } else {

      vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,

                         "Truncated partition size data");

    }

  } else {

    partition_size = (unsigned int)bytes_left;

  }

  /* 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)) {

    if (pbi->ec_active) {

      partition_size = (unsigned int)bytes_left;

    } else {

      vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,

                         "Truncated packet or corrupt partition "

                         "%d length",

                         i + 1);

    }

  }

  return partition_size;

}

static void setup_token_decoder(VP8D_COMP *pbi,

                                const unsigned char *token_part_sizes) {

  vp8_reader *bool_decoder = &pbi->mbc[0];

  unsigned int partition_idx;

  unsigned int fragment_idx;

  unsigned int num_token_partitions;

  const unsigned char *first_fragment_end =

      pbi->fragments.ptrs[0] + pbi->fragments.sizes[0];

  TOKEN_PARTITION multi_token_partition =

      (TOKEN_PARTITION)vp8_read_literal(&pbi->mbc[8], 2);

  if (!vp8dx_bool_error(&pbi->mbc[8])) {

    pbi->common.multi_token_partition = multi_token_partition;

  }

  num_token_partitions = 1 << pbi->common.multi_token_partition;

  /* 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->fragments.count; ++fragment_idx) {

    unsigned int fragment_size = pbi->fragments.sizes[fragment_idx];

    const unsigned char *fragment_end =

        pbi->fragments.ptrs[fragment_idx] + fragment_size;

    /* Special case for handling the first partition since we have already

     * read its size. */

    if (fragment_idx == 0) {

      /* Size of first partition + token partition sizes element */

      ptrdiff_t ext_first_part_size = token_part_sizes -

                                      pbi->fragments.ptrs[0] +

                                      3 * (num_token_partitions - 1);

      if (fragment_size < (unsigned int)ext_first_part_size)

        vpx_internal_error(&pbi->common.error, VPX_CODEC_CORRUPT_FRAME,

                           "Corrupted fragment size %d", fragment_size);

      fragment_size -= (unsigned int)ext_first_part_size;

      if (fragment_size > 0) {

        pbi->fragments.sizes[0] = (unsigned int)ext_first_part_size;

        /* The fragment contains an additional partition. Move to

         * next. */

        fragment_idx++;

        pbi->fragments.ptrs[fragment_idx] =

            pbi->fragments.ptrs[0] + pbi->fragments.sizes[0];

      }

    }

    /* Split the chunk into partitions read from the bitstream */

    while (fragment_size > 0) {

      ptrdiff_t partition_size = read_available_partition_size(

          pbi, token_part_sizes, pbi->fragments.ptrs[fragment_idx],

          first_fragment_end, fragment_end, fragment_idx - 1,

          num_token_partitions);

      pbi->fragments.sizes[fragment_idx] = (unsigned int)partition_size;

      if (fragment_size < (unsigned int)partition_size)

        vpx_internal_error(&pbi->common.error, VPX_CODEC_CORRUPT_FRAME,

                           "Corrupted fragment size %d", fragment_size);

      fragment_size -= (unsigned int)partition_size;

      assert(fragment_idx <= num_token_partitions);

      if (fragment_size > 0) {

        /* The fragment contains an additional partition.

         * Move to next. */

        fragment_idx++;

        pbi->fragments.ptrs[fragment_idx] =

            pbi->fragments.ptrs[fragment_idx - 1] + partition_size;

      }

    }

  }

  pbi->fragments.count = num_token_partitions + 1;

  for (partition_idx = 1; partition_idx < pbi->fragments.count;

       ++partition_idx) {

    if (vp8dx_start_decode(bool_decoder, pbi->fragments.ptrs[partition_idx],

                           pbi->fragments.sizes[partition_idx], pbi->decrypt_cb,

                           pbi->decrypt_state)) {

      vpx_internal_error(&pbi->common.error, VPX_CODEC_MEM_ERROR,

                         "Failed to allocate bool decoder %d", partition_idx);

    }

    bool_decoder++;

  }

#if CONFIG_MULTITHREAD

  /* Clamp number of decoder threads */

  if (pbi->decoding_thread_count > num_token_partitions - 1) {

    pbi->decoding_thread_count = num_token_partitions - 1;

  }

  if ((int)pbi->decoding_thread_count > pbi->common.mb_rows - 1) {

    assert(pbi->common.mb_rows > 0);

    pbi->decoding_thread_count = pbi->common.mb_rows - 1;

  }

#endif

}

static void init_frame(VP8D_COMP *pbi) {

  VP8_COMMON *const pc = &pbi->common;

  MACROBLOCKD *const xd = &pbi->mb;

  if (pc->frame_type == KEY_FRAME) {

    /* Various keyframe initializations */

    memcpy(pc->fc.mvc, vp8_default_mv_context, sizeof(vp8_default_mv_context));

    vp8_init_mbmode_probs(pc);

    vp8_default_coef_probs(pc);

    /* reset the segment feature data to 0 with delta coding (Default state). */

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

    xd->mb_segment_abs_delta = SEGMENT_DELTADATA;

    /* reset the mode ref deltasa for loop filter */

    memset(xd->ref_lf_deltas, 0, sizeof(xd->ref_lf_deltas));

    memset(xd->mode_lf_deltas, 0, sizeof(xd->mode_lf_deltas));

    /* All buffers are implicitly updated on key frames. */

    pc->refresh_golden_frame = 1;

    pc->refresh_alt_ref_frame = 1;

    pc->copy_buffer_to_gf = 0;

    pc->copy_buffer_to_arf = 0;

    /* Note that Golden and Altref modes cannot be used on a key frame so

     * ref_frame_sign_bias[] is undefined and meaningless

     */

    pc->ref_frame_sign_bias[GOLDEN_FRAME] = 0;

    pc->ref_frame_sign_bias[ALTREF_FRAME] = 0;

  } else {

    /* To enable choice of different interploation filters */

    if (!pc->use_bilinear_mc_filter) {

      xd->subpixel_predict = vp8_sixtap_predict4x4;

      xd->subpixel_predict8x4 = vp8_sixtap_predict8x4;

      xd->subpixel_predict8x8 = vp8_sixtap_predict8x8;

      xd->subpixel_predict16x16 = vp8_sixtap_predict16x16;

    } else {

      xd->subpixel_predict = vp8_bilinear_predict4x4;

      xd->subpixel_predict8x4 = vp8_bilinear_predict8x4;

      xd->subpixel_predict8x8 = vp8_bilinear_predict8x8;

      xd->subpixel_predict16x16 = vp8_bilinear_predict16x16;

    }

    if (pbi->decoded_key_frame && pbi->ec_enabled && !pbi->ec_active) {

      pbi->ec_active = 1;

    }

  }

  xd->left_context = &pc->left_context;

  xd->mode_info_context = pc->mi;

  xd->frame_type = pc->frame_type;

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

  xd->mode_info_stride = pc->mode_info_stride;

  xd->corrupted = 0; /* init without corruption */

  xd->fullpixel_mask = ~0;

  if (pc->full_pixel) xd->fullpixel_mask = ~7;

}

int vp8_decode_frame(VP8D_COMP *pbi) {

  vp8_reader *const bc = &pbi->mbc[8];

  VP8_COMMON *const pc = &pbi->common;

  MACROBLOCKD *const xd = &pbi->mb;

  const unsigned char *data = pbi->fragments.ptrs[0];

  const unsigned int data_sz = pbi->fragments.sizes[0];

  const unsigned char *data_end = data + data_sz;

  int first_partition_length_in_bytes;

  int i, j, k, l;

  const int *const mb_feature_data_bits = vp8_mb_feature_data_bits;

  int corrupt_tokens = 0;

  int prev_independent_partitions = pbi->independent_partitions;

  YV12_BUFFER_CONFIG *yv12_fb_new = pbi->dec_fb_ref[INTRA_FRAME];

  /* start with no corruption of current frame */

  xd->corrupted = 0;

  yv12_fb_new->corrupted = 0;

  if (data_end - data < 3) {

    if (!pbi->ec_active) {

      vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,

                         "Truncated packet");

    }

    /* 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;

  } else {

    unsigned char clear_buffer[10];

    const unsigned char *clear = data;

    if (pbi->decrypt_cb) {

      int n = (int)VPXMIN(sizeof(clear_buffer), data_sz);

      pbi->decrypt_cb(pbi->decrypt_state, data, clear_buffer, n);

      clear = clear_buffer;

    }

    pc->frame_type = (FRAME_TYPE)(clear[0] & 1);

    pc->version = (clear[0] >> 1) & 7;

    pc->show_frame = (clear[0] >> 4) & 1;

    first_partition_length_in_bytes =

        (clear[0] | (clear[1] << 8) | (clear[2] << 16)) >> 5;

    if (!pbi->ec_active && first_partition_length_in_bytes == 0) {

      vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,

                         "Corrupt partition 0 length");

    }

    data += 3;

    clear += 3;

    vp8_setup_version(pc);

    if (pc->frame_type == KEY_FRAME) {

      if (data_end - data >= 7) {

        /* vet via sync code */

        /* When error concealment is enabled we should only check the sync

         * code if we have enough bits available

         */

        if (clear[0] != 0x9d || clear[1] != 0x01 || clear[2] != 0x2a) {

          vpx_internal_error(&pc->error, VPX_CODEC_UNSUP_BITSTREAM,

                             "Invalid frame sync code");

        }

        pc->Width = (clear[3] | (clear[4] << 8)) & 0x3fff;

        pc->horiz_scale = clear[4] >> 6;

        pc->Height = (clear[5] | (clear[6] << 8)) & 0x3fff;

        pc->vert_scale = clear[6] >> 6;

        data += 7;

      } else if (!pbi->ec_active) {

        vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,

                           "Truncated key frame header");

      } else {

        /* Error concealment is active, clear the frame. */

        data = data_end;

      }

    } else {

      xd->pre = *yv12_fb_new;

      xd->dst = *yv12_fb_new;

    }

  }

  if ((!pbi->decoded_key_frame && pc->frame_type != KEY_FRAME)) {

    return -1;

  }

  if (!pbi->ec_active && data_end - data < first_partition_length_in_bytes) {

    vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,

                       "Truncated packet or corrupt partition 0 length");

  }

  init_frame(pbi);

  if (vp8dx_start_decode(bc, data, (unsigned int)(data_end - data),

                         pbi->decrypt_cb, pbi->decrypt_state)) {

    vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,

                       "Failed to allocate bool decoder 0");

  }

  if (pc->frame_type == KEY_FRAME) {

    (void)vp8_read_bit(bc);  // colorspace

    pc->clamp_type = (CLAMP_TYPE)vp8_read_bit(bc);

  }

  /* Is segmentation enabled */

  xd->segmentation_enabled = (unsigned char)vp8_read_bit(bc);

  if (xd->segmentation_enabled) {

    /* Signal whether or not the segmentation map is being explicitly updated

     * this frame. */

    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_segment_abs_delta = (unsigned char)vp8_read_bit(bc);

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

      /* For each segmentation feature (Quant and loop filter level) */

      for (i = 0; i < MB_LVL_MAX; ++i) {

        for (j = 0; j < MAX_MB_SEGMENTS; ++j) {

          /* Frame level data */

          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) {

      /* Which macro block level features are enabled */

      memset(xd->mb_segment_tree_probs, 255, sizeof(xd->mb_segment_tree_probs));

      /* Read the probs used to decode the segment id for each macro block. */

      for (i = 0; i < MB_FEATURE_TREE_PROBS; ++i) {

        /* If not explicitly set value is defaulted to 255 by memset above */

        if (vp8_read_bit(bc)) {

          xd->mb_segment_tree_probs[i] = (vp8_prob)vp8_read_literal(bc, 8);

        }

      }

    }

  } else {

    /* No segmentation updates on this frame */

    xd->update_mb_segmentation_map = 0;

    xd->update_mb_segmentation_data = 0;

  }

  /* Read the loop filter level and type */

  pc->filter_type = (LOOPFILTERTYPE)vp8_read_bit(bc);