/*

 *  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 <limits.h>

#include <stdio.h>

#include "vpx_config.h"

#include "vp8/common/common.h"

#include "vp8/common/entropymode.h"

#include "vp8/common/extend.h"

#include "vp8/common/invtrans.h"

#include "vp8/common/quant_common.h"

#include "vp8/common/reconinter.h"

#include "vp8/common/setupintrarecon.h"

#include "vp8/common/threading.h"

#include "vp8/encoder/bitstream.h"

#include "vp8/encoder/encodeframe.h"

#include "vp8/encoder/encodeintra.h"

#include "vp8/encoder/encodemb.h"

#include "vp8/encoder/onyx_int.h"

#include "vp8/encoder/pickinter.h"

#include "vp8/encoder/rdopt.h"

#include "vp8_rtcd.h"

#include "vpx/internal/vpx_codec_internal.h"

#include "vpx_dsp_rtcd.h"

#include "vpx_mem/vpx_mem.h"

#include "vpx_ports/vpx_timer.h"

#if CONFIG_MULTITHREAD

#include "vp8/encoder/ethreading.h"

#endif

extern void vp8_stuff_mb(VP8_COMP *cpi, MACROBLOCK *x, TOKENEXTRA **t);

static void adjust_act_zbin(VP8_COMP *cpi, MACROBLOCK *x);

#ifdef MODE_STATS

unsigned int inter_y_modes[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

unsigned int inter_uv_modes[4] = { 0, 0, 0, 0 };

unsigned int inter_b_modes[15] = {

  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

};

unsigned int y_modes[5] = { 0, 0, 0, 0, 0 };

unsigned int uv_modes[4] = { 0, 0, 0, 0 };

unsigned int b_modes[14] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

#endif

/* activity_avg must be positive, or flat regions could get a zero weight

 *  (infinite lambda), which confounds analysis.

 * This also avoids the need for divide by zero checks in

 *  vp8_activity_masking().

 */

#define VP8_ACTIVITY_AVG_MIN (64)

/* This is used as a reference when computing the source variance for the

 *  purposes of activity masking.

 * Eventually this should be replaced by custom no-reference routines,

 *  which will be faster.

 */

static const unsigned char VP8_VAR_OFFS[16] = { 128, 128, 128, 128, 128, 128,

                                                128, 128, 128, 128, 128, 128,

                                                128, 128, 128, 128 };

/* Original activity measure from Tim T's code. */

static unsigned int tt_activity_measure(MACROBLOCK *x) {

  unsigned int act;

  unsigned int sse;

  /* TODO: This could also be done over smaller areas (8x8), but that would

   *  require extensive changes elsewhere, as lambda is assumed to be fixed

   *  over an entire MB in most of the code.

   * Another option is to compute four 8x8 variances, and pick a single

   *  lambda using a non-linear combination (e.g., the smallest, or second

   *  smallest, etc.).

   */

  act = vpx_variance16x16(x->src.y_buffer, x->src.y_stride, VP8_VAR_OFFS, 0,

                          &sse);

  act = act << 4;

  /* If the region is flat, lower the activity some more. */

  if (act < 8 << 12) act = act < 5 << 12 ? act : 5 << 12;

  return act;

}

/* Measure the activity of the current macroblock

 * What we measure here is TBD so abstracted to this function

 */

#define ALT_ACT_MEASURE 1

static unsigned int mb_activity_measure(MACROBLOCK *x, int mb_row, int mb_col) {

  unsigned int mb_activity;

  if (ALT_ACT_MEASURE) {

    int use_dc_pred = (mb_col > 1 && mb_row > 1);

    /* Or use an alternative. */

    mb_activity = vp8_encode_intra(x, use_dc_pred);

  } else {

    /* Original activity measure from Tim T's code. */

    mb_activity = tt_activity_measure(x);

  }

  if (mb_activity < VP8_ACTIVITY_AVG_MIN) mb_activity = VP8_ACTIVITY_AVG_MIN;

  return mb_activity;

}

/* Calculate an "average" mb activity value for the frame */

#define ACT_MEDIAN 0

static void calc_av_activity(VP8_COMP *cpi, int64_t activity_sum) {

#if ACT_MEDIAN

  /* Find median: Simple n^2 algorithm for experimentation */

  {

    unsigned int median;

    unsigned int i, j;

    unsigned int *sortlist;

    unsigned int tmp;

    /* Create a list to sort to */

    CHECK_MEM_ERROR(&cpi->common.error, sortlist,

                    vpx_calloc(sizeof(unsigned int), cpi->common.MBs));

    /* Copy map to sort list */

    memcpy(sortlist, cpi->mb_activity_map,

           sizeof(unsigned int) * cpi->common.MBs);

    /* Ripple each value down to its correct position */

    for (i = 1; i < cpi->common.MBs; ++i) {

      for (j = i; j > 0; j--) {

        if (sortlist[j] < sortlist[j - 1]) {

          /* Swap values */

          tmp = sortlist[j - 1];

          sortlist[j - 1] = sortlist[j];

          sortlist[j] = tmp;

        } else

          break;

      }

    }

    /* Even number MBs so estimate median as mean of two either side. */

    median = (1 + sortlist[cpi->common.MBs >> 1] +

              sortlist[(cpi->common.MBs >> 1) + 1]) >>

             1;

    cpi->activity_avg = median;

    vpx_free(sortlist);

  }

#else

  /* Simple mean for now */

  cpi->activity_avg = (unsigned int)(activity_sum / cpi->common.MBs);

#endif

  if (cpi->activity_avg < VP8_ACTIVITY_AVG_MIN) {

    cpi->activity_avg = VP8_ACTIVITY_AVG_MIN;

  }

  /* Experimental code: return fixed value normalized for several clips */

  if (ALT_ACT_MEASURE) cpi->activity_avg = 100000;

}

#define USE_ACT_INDEX 0

#define OUTPUT_NORM_ACT_STATS 0

#if USE_ACT_INDEX

/* Calculate and activity index for each mb */

static void calc_activity_index(VP8_COMP *cpi, MACROBLOCK *x) {

  VP8_COMMON *const cm = &cpi->common;

  int mb_row, mb_col;

  int64_t act;

  int64_t a;

  int64_t b;

#if OUTPUT_NORM_ACT_STATS

  FILE *f = fopen("norm_act.stt", "a");

  fprintf(f, "\n%12d\n", cpi->activity_avg);

#endif

  /* Reset pointers to start of activity map */

  x->mb_activity_ptr = cpi->mb_activity_map;

  /* Calculate normalized mb activity number. */

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

    /* for each macroblock col in image */

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

      /* Read activity from the map */

      act = *(x->mb_activity_ptr);

      /* Calculate a normalized activity number */

      a = act + 4 * cpi->activity_avg;

      b = 4 * act + cpi->activity_avg;

      if (b >= a)

        *(x->activity_ptr) = (int)((b + (a >> 1)) / a) - 1;

      else

        *(x->activity_ptr) = 1 - (int)((a + (b >> 1)) / b);

#if OUTPUT_NORM_ACT_STATS

      fprintf(f, " %6d", *(x->mb_activity_ptr));

#endif

      /* Increment activity map pointers */

      x->mb_activity_ptr++;

    }

#if OUTPUT_NORM_ACT_STATS

    fprintf(f, "\n");

#endif

  }

#if OUTPUT_NORM_ACT_STATS

  fclose(f);

#endif

}

#endif

/* Loop through all MBs. Note activity of each, average activity and

 * calculate a normalized activity for each

 */

static void build_activity_map(VP8_COMP *cpi) {

  MACROBLOCK *const x = &cpi->mb;

  MACROBLOCKD *xd = &x->e_mbd;

  VP8_COMMON *const cm = &cpi->common;

#if ALT_ACT_MEASURE

  YV12_BUFFER_CONFIG *new_yv12 = &cm->yv12_fb[cm->new_fb_idx];

  int recon_yoffset;

  int recon_y_stride = new_yv12->y_stride;

#endif

  int mb_row, mb_col;

  unsigned int mb_activity;

  int64_t activity_sum = 0;

  /* for each macroblock row in image */

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

#if ALT_ACT_MEASURE

    /* reset above block coeffs */

    xd->up_available = (mb_row != 0);

    recon_yoffset = (mb_row * recon_y_stride * 16);

#endif

    /* for each macroblock col in image */

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

#if ALT_ACT_MEASURE

      xd->dst.y_buffer = new_yv12->y_buffer + recon_yoffset;

      xd->left_available = (mb_col != 0);

      recon_yoffset += 16;

#endif

      /* Copy current mb to a buffer */

      vp8_copy_mem16x16(x->src.y_buffer, x->src.y_stride, x->thismb, 16);

      /* measure activity */

      mb_activity = mb_activity_measure(x, mb_row, mb_col);

      /* Keep frame sum */

      activity_sum += mb_activity;

      /* Store MB level activity details. */

      *x->mb_activity_ptr = mb_activity;

      /* Increment activity map pointer */

      x->mb_activity_ptr++;

      /* adjust to the next column of source macroblocks */

      x->src.y_buffer += 16;

    }

    /* adjust to the next row of mbs */

    x->src.y_buffer += 16 * x->src.y_stride - 16 * cm->mb_cols;

#if ALT_ACT_MEASURE

    /* extend the recon for intra prediction */

    vp8_extend_mb_row(new_yv12, xd->dst.y_buffer + 16, xd->dst.u_buffer + 8,

                      xd->dst.v_buffer + 8);

#endif

  }

  /* Calculate an "average" MB activity */

  calc_av_activity(cpi, activity_sum);

#if USE_ACT_INDEX

  /* Calculate an activity index number of each mb */

  calc_activity_index(cpi, x);

#endif

}

/* Macroblock activity masking */

void vp8_activity_masking(VP8_COMP *cpi, MACROBLOCK *x) {

#if USE_ACT_INDEX

  x->rdmult += *(x->mb_activity_ptr) * (x->rdmult >> 2);

  x->errorperbit = x->rdmult * 100 / (110 * x->rddiv);

  x->errorperbit += (x->errorperbit == 0);

#else

  int64_t a;

  int64_t b;

  int64_t act = *(x->mb_activity_ptr);

  /* Apply the masking to the RD multiplier. */

  a = act + (2 * cpi->activity_avg);

  b = (2 * act) + cpi->activity_avg;

  x->rdmult = (unsigned int)(((int64_t)x->rdmult * b + (a >> 1)) / a);

  x->errorperbit = x->rdmult * 100 / (110 * x->rddiv);

  x->errorperbit += (x->errorperbit == 0);

#endif

  /* Activity based Zbin adjustment */

  adjust_act_zbin(cpi, x);

}

static void encode_mb_row(VP8_COMP *cpi, VP8_COMMON *cm, int mb_row,

                          MACROBLOCK *x, MACROBLOCKD *xd, TOKENEXTRA **tp,

                          int *segment_counts, int *totalrate) {

  int recon_yoffset, recon_uvoffset;

  int mb_col;

  int ref_fb_idx = cm->lst_fb_idx;

  int dst_fb_idx = cm->new_fb_idx;

  int recon_y_stride = cm->yv12_fb[ref_fb_idx].y_stride;

  int recon_uv_stride = cm->yv12_fb[ref_fb_idx].uv_stride;

  int map_index = (mb_row * cpi->common.mb_cols);

#if (CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING)

  const int num_part = (1 << cm->multi_token_partition);

  TOKENEXTRA *tp_start = cpi->tok;

  vp8_writer *w;

#endif

#if CONFIG_MULTITHREAD

  const int nsync = cpi->mt_sync_range;

  vpx_atomic_int rightmost_col = VPX_ATOMIC_INIT(cm->mb_cols + nsync);

  const vpx_atomic_int *last_row_current_mb_col;

  vpx_atomic_int *current_mb_col = NULL;

  if (vpx_atomic_load_acquire(&cpi->b_multi_threaded) != 0) {

    current_mb_col = &cpi->mt_current_mb_col[mb_row];

  }

  if (vpx_atomic_load_acquire(&cpi->b_multi_threaded) != 0 && mb_row != 0) {

    last_row_current_mb_col = &cpi->mt_current_mb_col[mb_row - 1];

  } else {

    last_row_current_mb_col = &rightmost_col;

  }

#endif

#if (CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING)

  if (num_part > 1)

    w = &cpi->bc[1 + (mb_row % num_part)];

  else

    w = &cpi->bc[1];

#endif

  /* reset above block coeffs */

  xd->above_context = cm->above_context;

  xd->up_available = (mb_row != 0);

  recon_yoffset = (mb_row * recon_y_stride * 16);

  recon_uvoffset = (mb_row * recon_uv_stride * 8);

  cpi->tplist[mb_row].start = *tp;

  /* printf("Main mb_row = %d\n", mb_row); */

  /* Distance of Mb to the top & bottom edges, specified in 1/8th pel

   * units as they are always compared to values that are in 1/8th pel

   */

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

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

  /* Set up limit values for vertical motion vector components

   * to prevent them extending beyond the UMV borders

   */

  x->mv_row_min = -((mb_row * 16) + (VP8BORDERINPIXELS - 16));

  x->mv_row_max = ((cm->mb_rows - 1 - mb_row) * 16) + (VP8BORDERINPIXELS - 16);

  /* Set the mb activity pointer to the start of the row. */

  x->mb_activity_ptr = &cpi->mb_activity_map[map_index];

  /* for each macroblock col in image */

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

#if (CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING)

    *tp = cpi->tok;

#endif

    /* Distance of Mb to the left & right edges, specified in

     * 1/8th pel units 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 = ((cm->mb_cols - 1 - mb_col) * 16) << 3;

    /* Set up limit values for horizontal motion vector components

     * to prevent them extending beyond the UMV borders

     */

    x->mv_col_min = -((mb_col * 16) + (VP8BORDERINPIXELS - 16));

    x->mv_col_max =

        ((cm->mb_cols - 1 - mb_col) * 16) + (VP8BORDERINPIXELS - 16);

    xd->dst.y_buffer = cm->yv12_fb[dst_fb_idx].y_buffer + recon_yoffset;

    xd->dst.u_buffer = cm->yv12_fb[dst_fb_idx].u_buffer + recon_uvoffset;

    xd->dst.v_buffer = cm->yv12_fb[dst_fb_idx].v_buffer + recon_uvoffset;

    xd->left_available = (mb_col != 0);

    x->rddiv = cpi->RDDIV;

    x->rdmult = cpi->RDMULT;

    /* Copy current mb to a buffer */

    vp8_copy_mem16x16(x->src.y_buffer, x->src.y_stride, x->thismb, 16);

#if CONFIG_MULTITHREAD

    if (vpx_atomic_load_acquire(&cpi->b_multi_threaded) != 0) {

      if (((mb_col - 1) % nsync) == 0) {

        vpx_atomic_store_release(current_mb_col, mb_col - 1);

      }

      if (mb_row && !(mb_col & (nsync - 1))) {

        vp8_atomic_spin_wait(mb_col, last_row_current_mb_col, nsync);

      }

    }

#endif

    if (cpi->oxcf.tuning == VP8_TUNE_SSIM) vp8_activity_masking(cpi, x);

    /* Is segmentation enabled */

    /* MB level adjustment to quantizer */

    if (xd->segmentation_enabled) {

      /* Code to set segment id in xd->mbmi.segment_id for current MB

       * (with range checking)

       */

      if (cpi->segmentation_map[map_index + mb_col] <= 3) {

        xd->mode_info_context->mbmi.segment_id =

            cpi->segmentation_map[map_index + mb_col];

      } else {

        xd->mode_info_context->mbmi.segment_id = 0;

      }

      vp8cx_mb_init_quantizer(cpi, x, 1);

    } else {

      /* Set to Segment 0 by default */

      xd->mode_info_context->mbmi.segment_id = 0;

    }

    x->active_ptr = cpi->active_map + map_index + mb_col;

    if (cm->frame_type == KEY_FRAME) {

      const int intra_rate_cost = vp8cx_encode_intra_macroblock(cpi, x, tp);

      if (INT_MAX - *totalrate > intra_rate_cost)

        *totalrate += intra_rate_cost;

      else

        *totalrate = INT_MAX;

#ifdef MODE_STATS

      y_modes[xd->mbmi.mode]++;

#endif

    } else {

      const int inter_rate_cost = vp8cx_encode_inter_macroblock(

          cpi, x, tp, recon_yoffset, recon_uvoffset, mb_row, mb_col);

      if (INT_MAX - *totalrate > inter_rate_cost)

        *totalrate += inter_rate_cost;

      else

        *totalrate = INT_MAX;

#ifdef MODE_STATS

      inter_y_modes[xd->mbmi.mode]++;

      if (xd->mbmi.mode == SPLITMV) {

        int b;

        for (b = 0; b < xd->mbmi.partition_count; ++b) {

          inter_b_modes[x->partition->bmi[b].mode]++;

        }

      }

#endif

      // Keep track of how many (consecutive) times a  block is coded

      // as ZEROMV_LASTREF, for base layer frames.

      // Reset to 0 if its coded as anything else.

      if (cpi->current_layer == 0) {

        if (xd->mode_info_context->mbmi.mode == ZEROMV &&

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

          // Increment, check for wrap-around.

          if (cpi->consec_zero_last[map_index + mb_col] < 255) {

            cpi->consec_zero_last[map_index + mb_col] += 1;

          }

          if (cpi->consec_zero_last_mvbias[map_index + mb_col] < 255) {

            cpi->consec_zero_last_mvbias[map_index + mb_col] += 1;

          }

        } else {

          cpi->consec_zero_last[map_index + mb_col] = 0;

          cpi->consec_zero_last_mvbias[map_index + mb_col] = 0;

        }

        if (x->zero_last_dot_suppress) {

          cpi->consec_zero_last_mvbias[map_index + mb_col] = 0;

        }

      }

      /* Special case code for cyclic refresh

       * If cyclic update enabled then copy xd->mbmi.segment_id; (which

       * may have been updated based on mode during

       * vp8cx_encode_inter_macroblock()) back into the global

       * segmentation map

       */

      if ((cpi->current_layer == 0) &&

          (cpi->cyclic_refresh_mode_enabled && xd->segmentation_enabled)) {

        cpi->segmentation_map[map_index + mb_col] =

            xd->mode_info_context->mbmi.segment_id;

        /* If the block has been refreshed mark it as clean (the

         * magnitude of the -ve influences how long it will be before

         * we consider another refresh):

         * Else if it was coded (last frame 0,0) and has not already

         * been refreshed then mark it as a candidate for cleanup

         * next time (marked 0) else mark it as dirty (1).

         */

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

          cpi->cyclic_refresh_map[map_index + mb_col] = -1;

        } else if ((xd->mode_info_context->mbmi.mode == ZEROMV) &&

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

          if (cpi->cyclic_refresh_map[map_index + mb_col] == 1) {

            cpi->cyclic_refresh_map[map_index + mb_col] = 0;

          }

        } else {

          cpi->cyclic_refresh_map[map_index + mb_col] = 1;

        }

      }

    }

    cpi->tplist[mb_row].stop = *tp;

#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING

    /* pack tokens for this MB */

    {

      int tok_count = *tp - tp_start;

      vp8_pack_tokens(w, tp_start, tok_count);

    }

#endif

    /* Increment pointer into gf usage flags structure. */

    x->gf_active_ptr++;

    /* Increment the activity mask pointers. */

    x->mb_activity_ptr++;

    /* adjust to the next column of macroblocks */

    x->src.y_buffer += 16;

    x->src.u_buffer += 8;

    x->src.v_buffer += 8;

    recon_yoffset += 16;

    recon_uvoffset += 8;

    /* Keep track of segment usage */

    segment_counts[xd->mode_info_context->mbmi.segment_id]++;

    /* skip to next mb */

    xd->mode_info_context++;

    x->partition_info++;

    xd->above_context++;

  }

  /* extend the recon for intra prediction */

  vp8_extend_mb_row(&cm->yv12_fb[dst_fb_idx], xd->dst.y_buffer + 16,

                    xd->dst.u_buffer + 8, xd->dst.v_buffer + 8);

#if CONFIG_MULTITHREAD

  if (vpx_atomic_load_acquire(&cpi->b_multi_threaded) != 0) {

    vpx_atomic_store_release(current_mb_col,

                             vpx_atomic_load_acquire(&rightmost_col));

  }

#endif

  /* this is to account for the border */

  xd->mode_info_context++;

  x->partition_info++;

}

static void init_encode_frame_mb_context(VP8_COMP *cpi) {

  MACROBLOCK *const x = &cpi->mb;

  VP8_COMMON *const cm = &cpi->common;

  MACROBLOCKD *const xd = &x->e_mbd;

  /* GF active flags data structure */

  x->gf_active_ptr = (signed char *)cpi->gf_active_flags;

  /* Activity map pointer */

  x->mb_activity_ptr = cpi->mb_activity_map;

  x->act_zbin_adj = 0;

  x->partition_info = x->pi;

  xd->mode_info_context = cm->mi;

  xd->mode_info_stride = cm->mode_info_stride;

  xd->frame_type = cm->frame_type;

  /* reset intra mode contexts */

  if (cm->frame_type == KEY_FRAME) vp8_init_mbmode_probs(cm);

  /* Copy data over into macro block data structures. */

  x->src = *cpi->Source;

  xd->pre = cm->yv12_fb[cm->lst_fb_idx];

  xd->dst = cm->yv12_fb[cm->new_fb_idx];

  /* set up frame for intra coded blocks */

  vp8_setup_intra_recon(&cm->yv12_fb[cm->new_fb_idx]);

  vp8_build_block_offsets(x);

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

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

  xd->left_context = &cm->left_context;

  x->mvc = cm->fc.mvc;

  memset(cm->above_context, 0, sizeof(ENTROPY_CONTEXT_PLANES) * cm->mb_cols);

  /* Special case treatment when GF and ARF are not sensible options

   * for reference

   */

  if (cpi->ref_frame_flags == VP8_LAST_FRAME) {

    vp8_calc_ref_frame_costs(x->ref_frame_cost, cpi->prob_intra_coded, 255,

                             128);

  } else if ((cpi->oxcf.number_of_layers > 1) &&

             (cpi->ref_frame_flags == VP8_GOLD_FRAME)) {

    vp8_calc_ref_frame_costs(x->ref_frame_cost, cpi->prob_intra_coded, 1, 255);

  } else if ((cpi->oxcf.number_of_layers > 1) &&

             (cpi->ref_frame_flags == VP8_ALTR_FRAME)) {

    vp8_calc_ref_frame_costs(x->ref_frame_cost, cpi->prob_intra_coded, 1, 1);

  } else {

    vp8_calc_ref_frame_costs(x->ref_frame_cost, cpi->prob_intra_coded,

                             cpi->prob_last_coded, cpi->prob_gf_coded);

  }

  xd->fullpixel_mask = ~0;

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

  vp8_zero(x->coef_counts);

  vp8_zero(x->ymode_count);

  vp8_zero(x->uv_mode_count);

  x->prediction_error = 0;

  x->intra_error = 0;

  vp8_zero(x->count_mb_ref_frame_usage);

}

#if CONFIG_MULTITHREAD

static void sum_coef_counts(MACROBLOCK *x, MACROBLOCK *x_thread) {

  int i = 0;

  do {

    int j = 0;

    do {

      int k = 0;

      do {

        /* at every context */

        /* calc probs and branch cts for this frame only */

        int t = 0; /* token/prob index */

        do {

          x->coef_counts[i][j][k][t] += x_thread->coef_counts[i][j][k][t];

        } while (++t < ENTROPY_NODES);

      } while (++k < PREV_COEF_CONTEXTS);

    } while (++j < COEF_BANDS);

  } while (++i < BLOCK_TYPES);

}

#endif  // CONFIG_MULTITHREAD

void vp8_encode_frame(VP8_COMP *cpi) {

  int mb_row;

  MACROBLOCK *const x = &cpi->mb;

  VP8_COMMON *const cm = &cpi->common;

  MACROBLOCKD *const xd = &x->e_mbd;

  TOKENEXTRA *tp = cpi->tok;

  int segment_counts[MAX_MB_SEGMENTS];

  int totalrate;

#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING

  BOOL_CODER *bc = &cpi->bc[1]; /* bc[0] is for control partition */

  const int num_part = (1 << cm->multi_token_partition);

#endif

  memset(segment_counts, 0, sizeof(segment_counts));

  totalrate = 0;

  if (cpi->compressor_speed == 2) {

    if (cpi->oxcf.cpu_used < 0) {

      cpi->Speed = -(cpi->oxcf.cpu_used);

    } else {

      vp8_auto_select_speed(cpi);

    }

  }

  /* Functions setup for all frame types so we can use MC in AltRef */

  if (!cm->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;

  }

  cpi->mb.skip_true_count = 0;

  cpi->tok_count = 0;

#if 0

    /* Experimental code */

    cpi->frame_distortion = 0;

    cpi->last_mb_distortion = 0;

#endif

  xd->mode_info_context = cm->mi;

  vp8_zero(cpi->mb.MVcount);

  vp8cx_frame_init_quantizer(cpi);

  vp8_initialize_rd_consts(cpi, x,

                           vp8_dc_quant(cm->base_qindex, cm->y1dc_delta_q));

  vp8cx_initialize_me_consts(cpi, cm->base_qindex);

  if (cpi->oxcf.tuning == VP8_TUNE_SSIM) {

    /* Initialize encode frame context. */

    init_encode_frame_mb_context(cpi);

    /* Build a frame level activity map */

    build_activity_map(cpi);

  }

  /* re-init encode frame context. */

  init_encode_frame_mb_context(cpi);

#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING

  {

    int i;

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

      vp8_start_encode(&bc[i], cpi->partition_d[i + 1],

                       cpi->partition_d_end[i + 1]);

      bc[i].error = &cm->error;

    }

  }

#endif

  {

#if CONFIG_INTERNAL_STATS

    struct vpx_usec_timer emr_timer;

    vpx_usec_timer_start(&emr_timer);

#endif

#if CONFIG_MULTITHREAD

    if (vpx_atomic_load_acquire(&cpi->b_multi_threaded)) {

      int i;

      vp8cx_init_mbrthread_data(cpi, x, cpi->mb_row_ei,

                                cpi->encoding_thread_count);

      if (cpi->mt_current_mb_col_size != cm->mb_rows) {

        vpx_free(cpi->mt_current_mb_col);

        cpi->mt_current_mb_col = NULL;

        cpi->mt_current_mb_col_size = 0;

        CHECK_MEM_ERROR(

            &cpi->common.error, cpi->mt_current_mb_col,

            vpx_malloc(sizeof(*cpi->mt_current_mb_col) * cm->mb_rows));

        cpi->mt_current_mb_col_size = cm->mb_rows;

      }

      for (i = 0; i < cm->mb_rows; ++i)

        vpx_atomic_store_release(&cpi->mt_current_mb_col[i], -1);

      for (i = 0; i < cpi->encoding_thread_count; ++i) {

        vp8_sem_post(&cpi->h_event_start_encoding[i]);

      }

      for (mb_row = 0; mb_row < cm->mb_rows;

           mb_row += (cpi->encoding_thread_count + 1)) {

        vp8_zero(cm->left_context);

#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING

        tp = cpi->tok;

#else

        tp = cpi->tok + mb_row * (cm->mb_cols * 16 * 24);

#endif

        encode_mb_row(cpi, cm, mb_row, x, xd, &tp, segment_counts, &totalrate);

        /* adjust to the next row of mbs */

        x->src.y_buffer +=

            16 * x->src.y_stride * (cpi->encoding_thread_count + 1) -

            16 * cm->mb_cols;

        x->src.u_buffer +=

            8 * x->src.uv_stride * (cpi->encoding_thread_count + 1) -

            8 * cm->mb_cols;

        x->src.v_buffer +=

            8 * x->src.uv_stride * (cpi->encoding_thread_count + 1) -

            8 * cm->mb_cols;

        xd->mode_info_context +=

            xd->mode_info_stride * cpi->encoding_thread_count;

        x->partition_info += xd->mode_info_stride * cpi->encoding_thread_count;

        x->gf_active_ptr += cm->mb_cols * cpi->encoding_thread_count;

      }

      /* Wait for all the threads to finish. */

      for (i = 0; i < cpi->encoding_thread_count; ++i) {

        vp8_sem_wait(&cpi->h_event_end_encoding[i]);

      }

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

        cpi->tok_count += (unsigned int)(cpi->tplist[mb_row].stop -

                                         cpi->tplist[mb_row].start);

      }

      if (xd->segmentation_enabled) {

        int j;

        if (xd->segmentation_enabled) {

          for (i = 0; i < cpi->encoding_thread_count; ++i) {

            for (j = 0; j < 4; ++j) {

              segment_counts[j] += cpi->mb_row_ei[i].segment_counts[j];

            }

          }

        }

      }

      for (i = 0; i < cpi->encoding_thread_count; ++i) {

        int mode_count;

        int c_idx;

        /* Saturate like encode_mb_row(); per-thread totalrate is already

         * clamped to INT_MAX individually, so their sum can overflow. */

        const int thread_rate = cpi->mb_row_ei[i].totalrate;

        if (INT_MAX - totalrate > thread_rate)

          totalrate += thread_rate;

        else

          totalrate = INT_MAX;

        cpi->mb.skip_true_count += cpi->mb_row_ei[i].mb.skip_true_count;

        for (mode_count = 0; mode_count < VP8_YMODES; ++mode_count) {

          cpi->mb.ymode_count[mode_count] +=

              cpi->mb_row_ei[i].mb.ymode_count[mode_count];

        }

        for (mode_count = 0; mode_count < VP8_UV_MODES; ++mode_count) {

          cpi->mb.uv_mode_count[mode_count] +=

              cpi->mb_row_ei[i].mb.uv_mode_count[mode_count];

        }

        for (c_idx = 0; c_idx < MVvals; ++c_idx) {

          cpi->mb.MVcount[0][c_idx] += cpi->mb_row_ei[i].mb.MVcount[0][c_idx];

          cpi->mb.MVcount[1][c_idx] += cpi->mb_row_ei[i].mb.MVcount[1][c_idx];

        }

        cpi->mb.prediction_error += cpi->mb_row_ei[i].mb.prediction_error;

        cpi->mb.intra_error += cpi->mb_row_ei[i].mb.intra_error;

        for (c_idx = 0; c_idx < MAX_REF_FRAMES; ++c_idx) {

          cpi->mb.count_mb_ref_frame_usage[c_idx] +=

              cpi->mb_row_ei[i].mb.count_mb_ref_frame_usage[c_idx];

        }

        for (c_idx = 0; c_idx < MAX_ERROR_BINS; ++c_idx) {

          cpi->mb.error_bins[c_idx] += cpi->mb_row_ei[i].mb.error_bins[c_idx];

        }

        /* add up counts for each thread */

        sum_coef_counts(x, &cpi->mb_row_ei[i].mb);

      }

    } else

#endif  // CONFIG_MULTITHREAD

    {

      /* for each macroblock row in image */

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

        vp8_zero(cm->left_context);

#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING

        tp = cpi->tok;

#endif

        encode_mb_row(cpi, cm, mb_row, x, xd, &tp, segment_counts, &totalrate);

        /* adjust to the next row of mbs */

        x->src.y_buffer += 16 * x->src.y_stride - 16 * cm->mb_cols;

        x->src.u_buffer += 8 * x->src.uv_stride - 8 * cm->mb_cols;

        x->src.v_buffer += 8 * x->src.uv_stride - 8 * cm->mb_cols;

      }

      cpi->tok_count = (unsigned int)(tp - cpi->tok);

    }

#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING

    {

      int i;

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

        vp8_stop_encode(&bc[i]);

        cpi->partition_sz[i + 1] = bc[i].pos;

      }

    }

#endif

#if CONFIG_INTERNAL_STATS

    vpx_usec_timer_mark(&emr_timer);

    cpi->time_encode_mb_row += vpx_usec_timer_elapsed(&emr_timer);

#endif

  }

  // Work out the segment probabilities if segmentation is enabled

  // and needs to be updated

  if (xd->segmentation_enabled && xd->update_mb_segmentation_map) {

    int tot_count;

    int i;

    /* Set to defaults */

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

    tot_count = segment_counts[0] + segment_counts[1] + segment_counts[2] +

                segment_counts[3];

    if (tot_count) {

      xd->mb_segment_tree_probs[0] =

          ((segment_counts[0] + segment_counts[1]) * 255) / tot_count;

      tot_count = segment_counts[0] + segment_counts[1];

      if (tot_count > 0) {

        xd->mb_segment_tree_probs[1] = (segment_counts[0] * 255) / tot_count;

      }

      tot_count = segment_counts[2] + segment_counts[3];

      if (tot_count > 0) {

        xd->mb_segment_tree_probs[2] = (segment_counts[2] * 255) / tot_count;

      }

      /* Zero probabilities not allowed */

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

        if (xd->mb_segment_tree_probs[i] == 0) xd->mb_segment_tree_probs[i] = 1;

      }

    }

  }

  /* projected_frame_size in units of BYTES */

  cpi->projected_frame_size = totalrate >> 8;

  /* Make a note of the percentage MBs coded Intra. */

  if (cm->frame_type == KEY_FRAME) {

    cpi->this_frame_percent_intra = 100;

  } else {

    int tot_modes;

    tot_modes = cpi->mb.count_mb_ref_frame_usage[INTRA_FRAME] +

                cpi->mb.count_mb_ref_frame_usage[LAST_FRAME] +

                cpi->mb.count_mb_ref_frame_usage[GOLDEN_FRAME] +

                cpi->mb.count_mb_ref_frame_usage[ALTREF_FRAME];

    if (tot_modes) {

      cpi->this_frame_percent_intra =

          cpi->mb.count_mb_ref_frame_usage[INTRA_FRAME] * 100 / tot_modes;

    }

  }

#if !CONFIG_REALTIME_ONLY

  /* Adjust the projected reference frame usage probability numbers to

   * reflect what we have just seen. This may be useful when we make

   * multiple iterations of the recode loop rather than continuing to use

   * values from the previous frame.

   */

  if ((cm->frame_type != KEY_FRAME) &&

      ((cpi->oxcf.number_of_layers > 1) ||

       (!cm->refresh_alt_ref_frame && !cm->refresh_golden_frame))) {

    vp8_convert_rfct_to_prob(cpi);

  }

#endif

}

void vp8_setup_block_ptrs(MACROBLOCK *x) {

  int r, c;

  int i;

  for (r = 0; r < 4; ++r) {

    for (c = 0; c < 4; ++c) {

      x->block[r * 4 + c].src_diff = x->src_diff + r * 4 * 16 + c * 4;

    }

  }

  for (r = 0; r < 2; ++r) {

    for (c = 0; c < 2; ++c) {

      x->block[16 + r * 2 + c].src_diff = x->src_diff + 256 + r * 4 * 8 + c * 4;