vp9_decodframe.c

  pc->last_width = pc->width;
  pc->last_height = pc->height;

  new_fb->corrupted |= xd->corrupted;

  if (!pbi->decoded_key_frame) {
    if (keyframe && !new_fb->corrupted)
      pbi->decoded_key_frame = 1;
    else
      vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
                         "A stream must start with a complete key frame");
  }

  if (!pc->error_resilient_mode && !pc->frame_parallel_decoding_mode) {
    vp9_adapt_coef_probs(pc);

    if (!keyframe && !pc->intra_only) {
      vp9_adapt_mode_probs(pc);
      vp9_adapt_mv_probs(pc, xd->allow_high_precision_mv);
    }
  }

  if (pc->refresh_frame_context)
    pc->frame_contexts[pc->frame_context_idx] = pc->fc;

  return 0;
}