/*
 *  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 <math.h>
#include <limits.h>

#include "vp9/common/vp9_alloccommon.h"
#include "vp9/common/vp9_onyxc_int.h"
#include "vp9/common/vp9_quant_common.h"
#include "vp9/common/vp9_reconinter.h"
#include "vp9/encoder/vp9_extend.h"
#include "vp9/encoder/vp9_firstpass.h"
#include "vp9/encoder/vp9_mcomp.h"
#include "vp9/encoder/vp9_encoder.h"
#include "vp9/encoder/vp9_quantize.h"
#include "vp9/encoder/vp9_ratectrl.h"
#include "vp9/encoder/vp9_segmentation.h"
#include "vp9/encoder/vp9_temporal_filter.h"
#include "vpx_dsp/vpx_dsp_common.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/mem.h"
#include "vpx_ports/vpx_timer.h"
#include "vpx_scale/vpx_scale.h"

static int fixed_divide[512];

static void temporal_filter_predictors_mb_c(
    MACROBLOCKD *xd, uint8_t *y_mb_ptr, uint8_t *u_mb_ptr, uint8_t *v_mb_ptr,
    int stride, int uv_block_width, int uv_block_height, int mv_row, int mv_col,
    uint8_t *pred, struct scale_factors *scale, int x, int y) {
  const int which_mv = 0;
  const MV mv = { mv_row, mv_col };
  const InterpKernel *const kernel = vp9_filter_kernels[EIGHTTAP_SHARP];

  enum mv_precision mv_precision_uv;
  int uv_stride;
  if (uv_block_width == 8) {
    uv_stride = (stride + 1) >> 1;
    mv_precision_uv = MV_PRECISION_Q4;
  } else {
    uv_stride = stride;
    mv_precision_uv = MV_PRECISION_Q3;
  }

#if CONFIG_VP9_HIGHBITDEPTH
  if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
    vp9_highbd_build_inter_predictor(y_mb_ptr, stride, &pred[0], 16, &mv, scale,
                                     16, 16, which_mv, kernel, MV_PRECISION_Q3,
                                     x, y, xd->bd);

    vp9_highbd_build_inter_predictor(u_mb_ptr, uv_stride, &pred[256],
                                     uv_block_width, &mv, scale, uv_block_width,
                                     uv_block_height, which_mv, kernel,
                                     mv_precision_uv, x, y, xd->bd);

    vp9_highbd_build_inter_predictor(v_mb_ptr, uv_stride, &pred[512],
                                     uv_block_width, &mv, scale, uv_block_width,
                                     uv_block_height, which_mv, kernel,
                                     mv_precision_uv, x, y, xd->bd);
    return;
  }
#endif  // CONFIG_VP9_HIGHBITDEPTH
  (void)xd;
  vp9_build_inter_predictor(y_mb_ptr, stride, &pred[0], 16, &mv, scale, 16, 16,
                            which_mv, kernel, MV_PRECISION_Q3, x, y);

  vp9_build_inter_predictor(u_mb_ptr, uv_stride, &pred[256], uv_block_width,
                            &mv, scale, uv_block_width, uv_block_height,
                            which_mv, kernel, mv_precision_uv, x, y);

  vp9_build_inter_predictor(v_mb_ptr, uv_stride, &pred[512], uv_block_width,
                            &mv, scale, uv_block_width, uv_block_height,
                            which_mv, kernel, mv_precision_uv, x, y);
}

void vp9_temporal_filter_init(void) {
  int i;

  fixed_divide[0] = 0;
  for (i = 1; i < 512; ++i) fixed_divide[i] = 0x80000 / i;
}

void vp9_temporal_filter_apply_c(uint8_t *frame1, unsigned int stride,
                                 uint8_t *frame2, unsigned int block_width,
                                 unsigned int block_height, int strength,
                                 int filter_weight, unsigned int *accumulator,
                                 uint16_t *count) {
  unsigned int i, j, k;
  int modifier;
  int byte = 0;
  const int rounding = strength > 0 ? 1 << (strength - 1) : 0;

  for (i = 0, k = 0; i < block_height; i++) {
    for (j = 0; j < block_width; j++, k++) {
      int pixel_value = *frame2;

      // non-local mean approach
      int diff_sse[9] = { 0 };
      int idx, idy, index = 0;

      for (idy = -1; idy <= 1; ++idy) {
        for (idx = -1; idx <= 1; ++idx) {
          int row = (int)i + idy;
          int col = (int)j + idx;

          if (row >= 0 && row < (int)block_height && col >= 0 &&
              col < (int)block_width) {
            int diff = frame1[byte + idy * (int)stride + idx] -
                       frame2[idy * (int)block_width + idx];
            diff_sse[index] = diff * diff;
            ++index;
          }
        }
      }

      assert(index > 0);

      modifier = 0;
      for (idx = 0; idx < 9; ++idx) modifier += diff_sse[idx];

      modifier *= 3;
      modifier /= index;

      ++frame2;

      modifier += rounding;
      modifier >>= strength;

      if (modifier > 16) modifier = 16;

      modifier = 16 - modifier;
      modifier *= filter_weight;

      count[k] += modifier;
      accumulator[k] += modifier * pixel_value;

      byte++;
    }

    byte += stride - block_width;
  }
}

#if CONFIG_VP9_HIGHBITDEPTH
void vp9_highbd_temporal_filter_apply_c(
    uint8_t *frame1_8, unsigned int stride, uint8_t *frame2_8,
    unsigned int block_width, unsigned int block_height, int strength,
    int filter_weight, unsigned int *accumulator, uint16_t *count) {
  uint16_t *frame1 = CONVERT_TO_SHORTPTR(frame1_8);
  uint16_t *frame2 = CONVERT_TO_SHORTPTR(frame2_8);
  unsigned int i, j, k;
  int modifier;
  int byte = 0;
  const int rounding = strength > 0 ? 1 << (strength - 1) : 0;

  for (i = 0, k = 0; i < block_height; i++) {
    for (j = 0; j < block_width; j++, k++) {
      int pixel_value = *frame2;
      int diff_sse[9] = { 0 };
      int idx, idy, index = 0;

      for (idy = -1; idy <= 1; ++idy) {
        for (idx = -1; idx <= 1; ++idx) {
          int row = (int)i + idy;
          int col = (int)j + idx;

          if (row >= 0 && row < (int)block_height && col >= 0 &&
              col < (int)block_width) {
            int diff = frame1[byte + idy * (int)stride + idx] -
                       frame2[idy * (int)block_width + idx];
            diff_sse[index] = diff * diff;
            ++index;
          }
        }
      }
      assert(index > 0);

      modifier = 0;
      for (idx = 0; idx < 9; ++idx) modifier += diff_sse[idx];

      modifier *= 3;
      modifier /= index;

      ++frame2;
      modifier += rounding;
      modifier >>= strength;

      if (modifier > 16) modifier = 16;

      modifier = 16 - modifier;
      modifier *= filter_weight;

      count[k] += modifier;
      accumulator[k] += modifier * pixel_value;

      byte++;
    }

    byte += stride - block_width;
  }
}
#endif  // CONFIG_VP9_HIGHBITDEPTH

static uint32_t temporal_filter_find_matching_mb_c(VP9_COMP *cpi,
                                                   uint8_t *arf_frame_buf,
                                                   uint8_t *frame_ptr_buf,
                                                   int stride) {
  MACROBLOCK *const x = &cpi->td.mb;
  MACROBLOCKD *const xd = &x->e_mbd;
  MV_SPEED_FEATURES *const mv_sf = &cpi->sf.mv;
  const SEARCH_METHODS old_search_method = mv_sf->search_method;
  int step_param;
  int sadpb = x->sadperbit16;
  uint32_t bestsme = UINT_MAX;
  uint32_t distortion;
  uint32_t sse;
  int cost_list[5];

  MV best_ref_mv1 = { 0, 0 };
  MV best_ref_mv1_full; /* full-pixel value of best_ref_mv1 */
  MV *ref_mv = &x->e_mbd.mi[0]->bmi[0].as_mv[0].as_mv;

  // Save input state
  struct buf_2d src = x->plane[0].src;
  struct buf_2d pre = xd->plane[0].pre[0];

  best_ref_mv1_full.col = best_ref_mv1.col >> 3;
  best_ref_mv1_full.row = best_ref_mv1.row >> 3;

  // Setup frame pointers
  x->plane[0].src.buf = arf_frame_buf;
  x->plane[0].src.stride = stride;
  xd->plane[0].pre[0].buf = frame_ptr_buf;
  xd->plane[0].pre[0].stride = stride;

  step_param = mv_sf->reduce_first_step_size;
  step_param = VPXMIN(step_param, MAX_MVSEARCH_STEPS - 2);

  mv_sf->search_method = HEX;
  vp9_full_pixel_search(cpi, x, BLOCK_16X16, &best_ref_mv1_full, step_param,
                        sadpb, cond_cost_list(cpi, cost_list), &best_ref_mv1,
                        ref_mv, 0, 0);
  mv_sf->search_method = old_search_method;

  // Ignore mv costing by sending NULL pointer instead of cost array
  bestsme = cpi->find_fractional_mv_step(
      x, ref_mv, &best_ref_mv1, cpi->common.allow_high_precision_mv,
      x->errorperbit, &cpi->fn_ptr[BLOCK_16X16], 0,
      mv_sf->subpel_iters_per_step, cond_cost_list(cpi, cost_list), NULL, NULL,
      &distortion, &sse, NULL, 0, 0);

  // Restore input state
  x->plane[0].src = src;
  xd->plane[0].pre[0] = pre;

  return bestsme;
}

static void temporal_filter_iterate_c(VP9_COMP *cpi,
                                      YV12_BUFFER_CONFIG **frames,
                                      int frame_count, int alt_ref_index,
                                      int strength,
                                      struct scale_factors *scale) {
  int byte;
  int frame;
  int mb_col, mb_row;
  unsigned int filter_weight;
  int mb_cols = (frames[alt_ref_index]->y_crop_width + 15) >> 4;
  int mb_rows = (frames[alt_ref_index]->y_crop_height + 15) >> 4;
  int mb_y_offset = 0;
  int mb_uv_offset = 0;
  DECLARE_ALIGNED(16, unsigned int, accumulator[16 * 16 * 3]);
  DECLARE_ALIGNED(16, uint16_t, count[16 * 16 * 3]);
  MACROBLOCKD *mbd = &cpi->td.mb.e_mbd;
  YV12_BUFFER_CONFIG *f = frames[alt_ref_index];
  uint8_t *dst1, *dst2;
#if CONFIG_VP9_HIGHBITDEPTH
  DECLARE_ALIGNED(16, uint16_t, predictor16[16 * 16 * 3]);
  DECLARE_ALIGNED(16, uint8_t, predictor8[16 * 16 * 3]);
  uint8_t *predictor;
#else
  DECLARE_ALIGNED(16, uint8_t, predictor[16 * 16 * 3]);
#endif
  const int mb_uv_height = 16 >> mbd->plane[1].subsampling_y;
  const int mb_uv_width = 16 >> mbd->plane[1].subsampling_x;

  // Save input state
  uint8_t *input_buffer[MAX_MB_PLANE];
  int i;
#if CONFIG_VP9_HIGHBITDEPTH
  if (mbd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
    predictor = CONVERT_TO_BYTEPTR(predictor16);
  } else {
    predictor = predictor8;
  }
#endif

  for (i = 0; i < MAX_MB_PLANE; i++) input_buffer[i] = mbd->plane[i].pre[0].buf;

  for (mb_row = 0; mb_row < mb_rows; mb_row++) {
    // Source frames are extended to 16 pixels. This is different than
    //  L/A/G reference frames that have a border of 32 (VP9ENCBORDERINPIXELS)
    // A 6/8 tap filter is used for motion search.  This requires 2 pixels
    //  before and 3 pixels after.  So the largest Y mv on a border would
    //  then be 16 - VP9_INTERP_EXTEND. The UV blocks are half the size of the
    //  Y and therefore only extended by 8.  The largest mv that a UV block
    //  can support is 8 - VP9_INTERP_EXTEND.  A UV mv is half of a Y mv.
    //  (16 - VP9_INTERP_EXTEND) >> 1 which is greater than
    //  8 - VP9_INTERP_EXTEND.
    // To keep the mv in play for both Y and UV planes the max that it
    //  can be on a border is therefore 16 - (2*VP9_INTERP_EXTEND+1).
    cpi->td.mb.mv_limits.row_min =
        -((mb_row * 16) + (17 - 2 * VP9_INTERP_EXTEND));
    cpi->td.mb.mv_limits.row_max =
        ((mb_rows - 1 - mb_row) * 16) + (17 - 2 * VP9_INTERP_EXTEND);

    for (mb_col = 0; mb_col < mb_cols; mb_col++) {
      int i, j, k;
      int stride;

      memset(accumulator, 0, 16 * 16 * 3 * sizeof(accumulator[0]));
      memset(count, 0, 16 * 16 * 3 * sizeof(count[0]));

      cpi->td.mb.mv_limits.col_min =
          -((mb_col * 16) + (17 - 2 * VP9_INTERP_EXTEND));
      cpi->td.mb.mv_limits.col_max =
          ((mb_cols - 1 - mb_col) * 16) + (17 - 2 * VP9_INTERP_EXTEND);

      for (frame = 0; frame < frame_count; frame++) {
        const uint32_t thresh_low = 10000;
        const uint32_t thresh_high = 20000;

        if (frames[frame] == NULL) continue;

        mbd->mi[0]->bmi[0].as_mv[0].as_mv.row = 0;
        mbd->mi[0]->bmi[0].as_mv[0].as_mv.col = 0;

        if (frame == alt_ref_index) {
          filter_weight = 2;
        } else {
          // Find best match in this frame by MC
          uint32_t err = temporal_filter_find_matching_mb_c(
              cpi, frames[alt_ref_index]->y_buffer + mb_y_offset,
              frames[frame]->y_buffer + mb_y_offset, frames[frame]->y_stride);

          // Assign higher weight to matching MB if its error
          // score is lower. If not applying MC default behavior
          // is to weight all MBs equal.
          filter_weight = err < thresh_low ? 2 : err < thresh_high ? 1 : 0;
        }

        if (filter_weight != 0) {
          // Construct the predictors
          temporal_filter_predictors_mb_c(
              mbd, frames[frame]->y_buffer + mb_y_offset,
              frames[frame]->u_buffer + mb_uv_offset,
              frames[frame]->v_buffer + mb_uv_offset, frames[frame]->y_stride,
              mb_uv_width, mb_uv_height, mbd->mi[0]->bmi[0].as_mv[0].as_mv.row,
              mbd->mi[0]->bmi[0].as_mv[0].as_mv.col, predictor, scale,
              mb_col * 16, mb_row * 16);

#if CONFIG_VP9_HIGHBITDEPTH
          if (mbd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
            int adj_strength = strength + 2 * (mbd->bd - 8);
            // Apply the filter (YUV)
            vp9_highbd_temporal_filter_apply_c(
                f->y_buffer + mb_y_offset, f->y_stride, predictor, 16, 16,
                adj_strength, filter_weight, accumulator, count);
            vp9_highbd_temporal_filter_apply_c(
                f->u_buffer + mb_uv_offset, f->uv_stride, predictor + 256,
                mb_uv_width, mb_uv_height, adj_strength, filter_weight,
                accumulator + 256, count + 256);
            vp9_highbd_temporal_filter_apply_c(
                f->v_buffer + mb_uv_offset, f->uv_stride, predictor + 512,
                mb_uv_width, mb_uv_height, adj_strength, filter_weight,
                accumulator + 512, count + 512);
          } else {
            // Apply the filter (YUV)
            vp9_temporal_filter_apply_c(f->y_buffer + mb_y_offset, f->y_stride,
                                        predictor, 16, 16, strength,
                                        filter_weight, accumulator, count);
            vp9_temporal_filter_apply_c(
                f->u_buffer + mb_uv_offset, f->uv_stride, predictor + 256,
                mb_uv_width, mb_uv_height, strength, filter_weight,
                accumulator + 256, count + 256);
            vp9_temporal_filter_apply_c(
                f->v_buffer + mb_uv_offset, f->uv_stride, predictor + 512,
                mb_uv_width, mb_uv_height, strength, filter_weight,
                accumulator + 512, count + 512);
          }
#else
          // Apply the filter (YUV)
          // TODO(jingning): Need SIMD optimization for this.
          vp9_temporal_filter_apply_c(f->y_buffer + mb_y_offset, f->y_stride,
                                      predictor, 16, 16, strength,
                                      filter_weight, accumulator, count);
          vp9_temporal_filter_apply_c(f->u_buffer + mb_uv_offset, f->uv_stride,
                                      predictor + 256, mb_uv_width,
                                      mb_uv_height, strength, filter_weight,
                                      accumulator + 256, count + 256);
          vp9_temporal_filter_apply_c(f->v_buffer + mb_uv_offset, f->uv_stride,
                                      predictor + 512, mb_uv_width,
                                      mb_uv_height, strength, filter_weight,
                                      accumulator + 512, count + 512);
#endif  // CONFIG_VP9_HIGHBITDEPTH
        }
      }

#if CONFIG_VP9_HIGHBITDEPTH
      if (mbd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
        uint16_t *dst1_16;
        uint16_t *dst2_16;
        // Normalize filter output to produce AltRef frame
        dst1 = cpi->alt_ref_buffer.y_buffer;
        dst1_16 = CONVERT_TO_SHORTPTR(dst1);
        stride = cpi->alt_ref_buffer.y_stride;
        byte = mb_y_offset;
        for (i = 0, k = 0; i < 16; i++) {
          for (j = 0; j < 16; j++, k++) {
            unsigned int pval = accumulator[k] + (count[k] >> 1);
            pval *= fixed_divide[count[k]];
            pval >>= 19;

            dst1_16[byte] = (uint16_t)pval;

            // move to next pixel
            byte++;
          }

          byte += stride - 16;
        }

        dst1 = cpi->alt_ref_buffer.u_buffer;
        dst2 = cpi->alt_ref_buffer.v_buffer;
        dst1_16 = CONVERT_TO_SHORTPTR(dst1);
        dst2_16 = CONVERT_TO_SHORTPTR(dst2);
        stride = cpi->alt_ref_buffer.uv_stride;
        byte = mb_uv_offset;
        for (i = 0, k = 256; i < mb_uv_height; i++) {
          for (j = 0; j < mb_uv_width; j++, k++) {
            int m = k + 256;

            // U
            unsigned int pval = accumulator[k] + (count[k] >> 1);
            pval *= fixed_divide[count[k]];
            pval >>= 19;
            dst1_16[byte] = (uint16_t)pval;

            // V
            pval = accumulator[m] + (count[m] >> 1);
            pval *= fixed_divide[count[m]];
            pval >>= 19;
            dst2_16[byte] = (uint16_t)pval;

            // move to next pixel
            byte++;
          }

          byte += stride - mb_uv_width;
        }
      } else {
        // Normalize filter output to produce AltRef frame
        dst1 = cpi->alt_ref_buffer.y_buffer;
        stride = cpi->alt_ref_buffer.y_stride;
        byte = mb_y_offset;
        for (i = 0, k = 0; i < 16; i++) {
          for (j = 0; j < 16; j++, k++) {
            unsigned int pval = accumulator[k] + (count[k] >> 1);
            pval *= fixed_divide[count[k]];
            pval >>= 19;

            dst1[byte] = (uint8_t)pval;

            // move to next pixel
            byte++;
          }
          byte += stride - 16;
        }

        dst1 = cpi->alt_ref_buffer.u_buffer;
        dst2 = cpi->alt_ref_buffer.v_buffer;
        stride = cpi->alt_ref_buffer.uv_stride;
        byte = mb_uv_offset;
        for (i = 0, k = 256; i < mb_uv_height; i++) {
          for (j = 0; j < mb_uv_width; j++, k++) {
            int m = k + 256;

            // U
            unsigned int pval = accumulator[k] + (count[k] >> 1);
            pval *= fixed_divide[count[k]];
            pval >>= 19;
            dst1[byte] = (uint8_t)pval;

            // V
            pval = accumulator[m] + (count[m] >> 1);
            pval *= fixed_divide[count[m]];
            pval >>= 19;
            dst2[byte] = (uint8_t)pval;

            // move to next pixel
            byte++;
          }
          byte += stride - mb_uv_width;
        }
      }
#else
      // Normalize filter output to produce AltRef frame
      dst1 = cpi->alt_ref_buffer.y_buffer;
      stride = cpi->alt_ref_buffer.y_stride;
      byte = mb_y_offset;
      for (i = 0, k = 0; i < 16; i++) {
        for (j = 0; j < 16; j++, k++) {
          unsigned int pval = accumulator[k] + (count[k] >> 1);
          pval *= fixed_divide[count[k]];
          pval >>= 19;

          dst1[byte] = (uint8_t)pval;

          // move to next pixel
          byte++;
        }
        byte += stride - 16;
      }

      dst1 = cpi->alt_ref_buffer.u_buffer;
      dst2 = cpi->alt_ref_buffer.v_buffer;
      stride = cpi->alt_ref_buffer.uv_stride;
      byte = mb_uv_offset;
      for (i = 0, k = 256; i < mb_uv_height; i++) {
        for (j = 0; j < mb_uv_width; j++, k++) {
          int m = k + 256;

          // U
          unsigned int pval = accumulator[k] + (count[k] >> 1);
          pval *= fixed_divide[count[k]];
          pval >>= 19;
          dst1[byte] = (uint8_t)pval;

          // V
          pval = accumulator[m] + (count[m] >> 1);
          pval *= fixed_divide[count[m]];
          pval >>= 19;
          dst2[byte] = (uint8_t)pval;

          // move to next pixel
          byte++;
        }
        byte += stride - mb_uv_width;
      }
#endif  // CONFIG_VP9_HIGHBITDEPTH
      mb_y_offset += 16;
      mb_uv_offset += mb_uv_width;
    }
    mb_y_offset += 16 * (f->y_stride - mb_cols);
    mb_uv_offset += mb_uv_height * f->uv_stride - mb_uv_width * mb_cols;
  }

  // Restore input state
  for (i = 0; i < MAX_MB_PLANE; i++) mbd->plane[i].pre[0].buf = input_buffer[i];
}

// Apply buffer limits and context specific adjustments to arnr filter.
static void adjust_arnr_filter(VP9_COMP *cpi, int distance, int group_boost,
                               int *arnr_frames, int *arnr_strength) {
  const VP9EncoderConfig *const oxcf = &cpi->oxcf;
  const int frames_after_arf =
      vp9_lookahead_depth(cpi->lookahead) - distance - 1;
  int frames_fwd = (cpi->oxcf.arnr_max_frames - 1) >> 1;
  int frames_bwd;
  int q, frames, base_strength, strength;

  // Context dependent two pass adjustment to strength.
  if (oxcf->pass == 2) {
    base_strength = oxcf->arnr_strength + cpi->twopass.arnr_strength_adjustment;
    // Clip to allowed range.
    base_strength = VPXMIN(6, VPXMAX(0, base_strength));
  } else {
    base_strength = oxcf->arnr_strength;
  }

  // Define the forward and backwards filter limits for this arnr group.
  if (frames_fwd > frames_after_arf) frames_fwd = frames_after_arf;
  if (frames_fwd > distance) frames_fwd = distance;

  frames_bwd = frames_fwd;

  // For even length filter there is one more frame backward
  // than forward: e.g. len=6 ==> bbbAff, len=7 ==> bbbAfff.
  if (frames_bwd < distance) frames_bwd += (oxcf->arnr_max_frames + 1) & 0x1;

  // Set the baseline active filter size.
  frames = frames_bwd + 1 + frames_fwd;

  // Adjust the strength based on active max q.
  if (cpi->common.current_video_frame > 1)
    q = ((int)vp9_convert_qindex_to_q(cpi->rc.avg_frame_qindex[INTER_FRAME],
                                      cpi->common.bit_depth));
  else
    q = ((int)vp9_convert_qindex_to_q(cpi->rc.avg_frame_qindex[KEY_FRAME],
                                      cpi->common.bit_depth));
  if (q > 16) {
    strength = base_strength;
  } else {
    strength = base_strength - ((16 - q) / 2);
    if (strength < 0) strength = 0;
  }

  // Adjust number of frames in filter and strength based on gf boost level.
  if (frames > group_boost / 150) {
    frames = group_boost / 150;
    frames += !(frames & 1);
  }

  if (strength > group_boost / 300) {
    strength = group_boost / 300;
  }

  // Adjustments for second level arf in multi arf case.
  if (cpi->oxcf.pass == 2 && cpi->multi_arf_allowed) {
    const GF_GROUP *const gf_group = &cpi->twopass.gf_group;
    if (gf_group->rf_level[gf_group->index] != GF_ARF_STD) {
      strength >>= 1;
    }
  }

  *arnr_frames = frames;
  *arnr_strength = strength;
}

void vp9_temporal_filter(VP9_COMP *cpi, int distance) {
  VP9_COMMON *const cm = &cpi->common;
  RATE_CONTROL *const rc = &cpi->rc;
  MACROBLOCKD *const xd = &cpi->td.mb.e_mbd;
  int frame;
  int frames_to_blur;
  int start_frame;
  int strength;
  int frames_to_blur_backward;
  int frames_to_blur_forward;
  struct scale_factors sf;
  YV12_BUFFER_CONFIG *frames[MAX_LAG_BUFFERS] = { NULL };

  // Apply context specific adjustments to the arnr filter parameters.
  adjust_arnr_filter(cpi, distance, rc->gfu_boost, &frames_to_blur, &strength);
  frames_to_blur_backward = (frames_to_blur / 2);
  frames_to_blur_forward = ((frames_to_blur - 1) / 2);
  start_frame = distance + frames_to_blur_forward;

  // Setup frame pointers, NULL indicates frame not included in filter.
  for (frame = 0; frame < frames_to_blur; ++frame) {
    const int which_buffer = start_frame - frame;
    struct lookahead_entry *buf =
        vp9_lookahead_peek(cpi->lookahead, which_buffer);
    frames[frames_to_blur - 1 - frame] = &buf->img;
  }

  if (frames_to_blur > 0) {
    // Setup scaling factors. Scaling on each of the arnr frames is not
    // supported.
    if (cpi->use_svc) {
      // In spatial svc the scaling factors might be less then 1/2.
      // So we will use non-normative scaling.
      int frame_used = 0;
#if CONFIG_VP9_HIGHBITDEPTH
      vp9_setup_scale_factors_for_frame(
          &sf, get_frame_new_buffer(cm)->y_crop_width,
          get_frame_new_buffer(cm)->y_crop_height,
          get_frame_new_buffer(cm)->y_crop_width,
          get_frame_new_buffer(cm)->y_crop_height, cm->use_highbitdepth);
#else
      vp9_setup_scale_factors_for_frame(
          &sf, get_frame_new_buffer(cm)->y_crop_width,
          get_frame_new_buffer(cm)->y_crop_height,
          get_frame_new_buffer(cm)->y_crop_width,
          get_frame_new_buffer(cm)->y_crop_height);
#endif  // CONFIG_VP9_HIGHBITDEPTH

      for (frame = 0; frame < frames_to_blur; ++frame) {
        if (cm->mi_cols * MI_SIZE != frames[frame]->y_width ||
            cm->mi_rows * MI_SIZE != frames[frame]->y_height) {
          if (vpx_realloc_frame_buffer(&cpi->svc.scaled_frames[frame_used],
                                       cm->width, cm->height, cm->subsampling_x,
                                       cm->subsampling_y,
#if CONFIG_VP9_HIGHBITDEPTH
                                       cm->use_highbitdepth,
#endif
                                       VP9_ENC_BORDER_IN_PIXELS,
                                       cm->byte_alignment, NULL, NULL, NULL)) {
            vpx_internal_error(&cm->error, VPX_CODEC_MEM_ERROR,
                               "Failed to reallocate alt_ref_buffer");
          }
          frames[frame] = vp9_scale_if_required(
              cm, frames[frame], &cpi->svc.scaled_frames[frame_used], 0);
          ++frame_used;
        }
      }
      cm->mi = cm->mip + cm->mi_stride + 1;
      xd->mi = cm->mi_grid_visible;
      xd->mi[0] = cm->mi;
    } else {
// ARF is produced at the native frame size and resized when coded.
#if CONFIG_VP9_HIGHBITDEPTH
      vp9_setup_scale_factors_for_frame(
          &sf, frames[0]->y_crop_width, frames[0]->y_crop_height,
          frames[0]->y_crop_width, frames[0]->y_crop_height,
          cm->use_highbitdepth);
#else
      vp9_setup_scale_factors_for_frame(
          &sf, frames[0]->y_crop_width, frames[0]->y_crop_height,
          frames[0]->y_crop_width, frames[0]->y_crop_height);
#endif  // CONFIG_VP9_HIGHBITDEPTH
    }
  }

  temporal_filter_iterate_c(cpi, frames, frames_to_blur,
                            frames_to_blur_backward, strength, &sf);
}
